• 专利附录
  • 专利说明
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    • 专利摘要:
    roller compressor an oil groove (80) on a fixed roller is disposed on a surface of an outer peripheral wall (63) of a fixed roller (60) which is in sliding contact with a back plate (71) of a roller in orbit (70). the oil groove (80) on the fixed roller extends along an inner periphery of the outer peripheral wall (63). the oil groove (80) on the stationary roller receives lubricating oil under high pressure corresponding to the discharge pressure of a compression mechanism (40). the oil groove (83) on the orbiting roller is disposed on a surface of the back plate (71) of the orbiting roller (70), which is in sliding contact with the outer peripheral wall (63) of the stationary roller (60 ). the oil groove (83) on the orbiting roller can communicate with the oil groove (80) on the stationary roller.
    公开号:BR112013023864B1
    申请号:R112013023864-0
    申请日:2012-03-06
    公开日:2021-06-01
    发明作者:Yoshitomo Tsuka；Youhei Nishide
    申请人:Daikin Industries, Ltd；
    IPC主号:
    专利说明:

    FIELD OF TECHNIQUE
    The present invention relates to roller compressors, more particularly to a lubrication structure in a roller compressor. BACKGROUND OF THE INVENTION
    Conventionally, roller compressors are known which include a compression mechanism having a fixed roller and an orbiting roller.
    Patent Document 1 describes this type of roller compressor, which includes a compression mechanism having a fixed roller and an orbiting roller. Specifically, the fixed roller includes a disc-shaped back plate, a cylindrical outer peripheral wall standing on one end of the fixed roller back plate, and a roller cover standing on the inside of the outer peripheral wall. The orbiting roller includes a back plate that is in sliding contact with outer peripheral wall ends and the fixed roller cover. The orbiting roller also includes a cover standing on the orbiting roller backplate. In the compression mechanism, the intertwined rollers form compression pockets between them. The orbiting roller eccentrically orbiting the stationary roller gradually reduces the volume of the compression pockets in order to compress the fluid in the compression pockets.
    This roller compressor disadvantageously increases the slip resistance over a contact surface between the stationary roller and the orbiting roller. To avoid this problem, the roller compressor of Patent Document 1 includes an oil groove on a surface of the outer peripheral wall of the fixed roller on which the fixed roller is in sliding contact with the orbiting roller. High pressure lubricating oil in the oil groove reduces the slip resistance on the sliding contact surface. LIST OF QUOTES
    PATENT DOCUMENT Patent Document 1: Japanese Patent No. 3731433. SUMMARY OF THE INVENTION TECHNIQUE PROBLEM
    In the configuration described above where the oil groove is disposed on the outer peripheral wall of the fixed roller, the oil groove which is inadequately sealed causes lubricating oil to leak into a space around the outer periphery of the orbiting roller. Specifically, a relatively long oil groove disposed along an inner circumference of the outer peripheral wall of the fixed roller makes the distance (seal length) of the oil groove over a certain part of the outer peripheral wall relatively short to an end of a periphery. outside of the orbiting roll back plate. High pressure lubricating oil leaks from the oil groove which has the short seal length to the outer periphery of the back plate through the orbiting roller back plate. This means that the lubricating oil supplied to the oil groove is needlessly discharged to the outside of the orbiting roller, which results in low lubrication on a sliding contact surface (the so-called drive surface) on the outer peripheral wall.
    The orbiting roller orbits eccentrically around the stationary roller. In this way, at a certain angle of orbital movement, the seal length can be significantly short. This means that, at this orbital angle of motion, the lubricating oil in the oil groove leaks significantly. This results in poor lubrication of the outer peripheral wall propulsion surface so as to reduce the reliability of the roller compressor.
    It is therefore an object of the present invention to provide a roller compressor that has a larger lubrication area over a propulsion surface to reliably lubricate the sliding surface. SOLUTION OF THE PROBLEM
    A first aspect of the present invention relates to a roller compressor that includes a compression mechanism (40). The compression mechanism (40) includes a fixed roller (60) and an orbiting roller (70). The fixed roller (60) includes a back plate (61), an outer peripheral wall (63) and a cover (62). The outer peripheral wall (63) rests on one end of the back plate (61). The cover (62) stands within the outer peripheral wall (63). The orbiting roller (70) includes a back plate (71) and a cover (72). The back plate (71) is in sliding contact with one end of the cap (62) of the fixed roller (60) and one end of the outer peripheral wall (63). The cover (72) stands on the back plate (71). The roller compressor includes an oil groove (80) on the fixed roller and an oil groove (83) on the orbiting roller. The oil groove (80) on the fixed roller is disposed on an outer peripheral wall surface (63) of the fixed roller (60) which is in sliding contact with the back plate (71) of the orbiting roller (70). The oil groove (80) on the fixed roller extends along an inner periphery of the outer peripheral wall (63). The oil groove (80) on the stationary roller receives lubricating oil under high pressure corresponding to the discharge pressure of the compression mechanism (40). The oil groove (83) on the orbiting roller is disposed on a surface of the rear wall (71) of the orbiting roller (70), which is in sliding contact with the outer peripheral wall (63) of the stationary roller (60 ). The oil groove (83) on the orbiting roller can communicate with the oil groove (80) on the stationary roller.
    In the first aspect of the present invention, the oil groove (80) on the stationary roller is disposed on the sliding contact surface of the outer peripheral wall (63) of the stationary roller (60). High pressure lubricating oil corresponding to the discharge pressure of the compression mechanism (40) is supplied to the oil groove (80) on the stationary roller. Lubricating oil is supplied to the sliding contact surface between the outer peripheral wall (63) and the back plate (71) of the orbiting roller (70) to lubricate this sliding contact surface. The oil groove (80) on the fixed roller is preferably long along the inner periphery of the outer peripheral wall (63) to increase the lubrication area between the outer peripheral wall (63) of the fixed roller (60) and the back plate (71) of the orbiting roller (70). This long oil groove (80) on the fixed roller, where the sealing length of the oil groove (80) on the fixed roller is short, however, may cause the lubricating oil in the oil groove (80) on the fixed roller continuously leaks to the outside of the back plate (71) of the orbiting roller (70).
    To avoid this problem, in the present invention, the oil groove (83) on the orbiting roller is disposed on the back plate (71) of the orbiting roller (70). The oil groove (83) on the orbiting roller can communicate with the oil groove (80) on the stationary roller. The oil groove (83) on the orbiting roller is arranged on the surface of the back plate (71), i.e. in sliding contact with the outer peripheral wall (63) of the fixed roller (60). Consequently, introducing lubricating oil into the oil groove (80) on the fixed roller to the oil groove (83) on the orbiting roller can increase the lubrication area between the back plate (71) of the orbiting roller (70 ) and the outer peripheral wall (63) of the fixed roller (60).
    In addition, the oil groove (83) on the orbit roller (70) moves with the orbit roller (70). In this way, the distance (the sealing length of the oil groove (83) on the orbiting roller) from the oil groove (83) on the orbiting roller to the end of the outer periphery of the back plate (71) of the orbiting roller. orbit (70) remains unchanged regardless of the angle of orbital movement of the orbit roll (70). In the present invention, therefore, the sealing length of the oil groove (83) on the orbiting roller is not short in eccentric orbital motion of the orbiting roller (70). Consequently, the leakage of lubricating oil under high pressure is reduced and the lubrication area on the propulsion surface between the outer peripheral wall (63) of the fixed roller (60) and the back plate (71) of the orbiting roller is sufficiently obtained. (70).
    A second aspect of the present invention relates to the roller compressor according to the first aspect of the present invention, wherein the oil groove (83) on the orbiting roller extends from one end of the oil groove ( 80) on the fixed roller along a periphery of the back plate (71).
    In the second aspect of the present invention, the oil groove (83) on the orbiting roller is disposed on the surface of the back plate (71), i.e. in sliding contact with the outer peripheral wall (63) of the fixed roller (60 ). The oil groove (83) on the orbiting roller also extends from the end of the oil groove (80) on the fixed roller along the periphery of the back plate (71). This configuration increases the lubrication area on the thrust surface between the outer peripheral wall (63) of the stationary roller (60) and the back plate (71) of the orbiting roller (70) along the periphery of the back plate (71) .
    A third aspect of the present invention relates to the roller compressor according to the first or second aspect of the present invention, wherein, in eccentric orbital movement of the orbiting roller (70), the oil groove (83) on the orbiting roller moves between a position in which the oil groove (83) on the orbiting roller communicates with the oil groove (80) on the stationary roller and a position in which the oil groove (83) on the orbiting roller is disconnected from the oil groove (80) on the fixed roller.
    In the third aspect of the present invention, the orbiting roller (70) in eccentric orbit allows the oil groove (83) on the orbiting roller to communicate with the oil groove (80) on the stationary roller. In this position, the lubricating oil under high pressure in the oil groove (80) on the stationary roller is loaded into the oil groove (83) on the orbiting roller. From that position, the orbiting roller (70) in eccentric orbit disconnects the oil groove (83) on the orbiting roller from the oil groove (80) on the stationary roller. In this position, oil loaded in the oil groove (83) on the orbiting roller is supplied to the sliding surface around the oil groove (83) on the orbiting roller. In this way, a fixed amount of the lubricating oil is supplied to the part which further extends from one end of the oil groove (80) on the fixed roller. In addition, when the lubricating oil in the oil groove (83) on the orbit roller disconnected from the oil groove (80) on the fixed roller leaks to the outside of the orbit roller (70), the amount of leakage is only , at most, the amount corresponding to the volume of the oil groove (83) on the orbiting roller. In this way, excessive leakage of lubricating oil can be reduced.
    A fourth aspect of the present invention relates to the roller compressor according to the third aspect of the present invention, wherein the oil groove (83) on the orbiting roller is disconnected from the oil groove (80) on the fixed roller communicates with the compression pockets (41) between the fixed roller (60) and the orbiting roller (70).
    In the fourth aspect of the present invention, the oil groove (83) on the orbiting roller disconnected from the oil groove (80) on the fixed roller in eccentric orbital motion of the orbiting roller (70) communicates with the compression pockets (41). In this way, a part of the oil loaded in the oil groove (83) on the orbiting roller is also supplied to the compression pockets (41). During this period, the oil groove (83) on the orbiting roller which communicates with the compression pockets (41) is disconnected from the oil groove (80) on the fixed roller. Consequently, the lubricating oil under high pressure in the oil groove (80) on the stationary roller is not directly and continuously supplied to the compression pockets (41) through the oil groove (83) on the orbiting roller. ADVANTAGES OF THE INVENTION
    In the present invention, the oil slot (83) on the orbiting roller which can communicate with the oil slot (80) on the stationary roller is disposed on the back plate (71) of the orbiting roller (70). This configuration reduces the leakage of lubricating oil under high pressure to the outside of the backplate (71) and also increases the lubrication area over the drive surface corresponding to the outer peripheral wall (63). This means that this configuration can improve the lubrication characteristics between the fixed roller (60) and the orbiting roller (70) and the reliability of the roller compressor (10).
    In the second aspect of the present invention, the oil groove (83) on the orbiting roller extends from one end of the oil groove (80) on the fixed roller along the periphery of the back plate (71). The present configuration can further increase the lubrication area on the propulsion surface.
    Particularly, in the third aspect of the present invention, on eccentric orbital motion of the orbiting roller (70), lubricating oil in the oil groove (80) on the stationary roller is intermittently supplied to the oil groove (83) on the orbiting roller. . In this way, a fixed amount of the lubricating oil is suitably supplied to the propulsion surface corresponding to the outer peripheral wall (63). Consequently, lubricating oil can be quantitatively supplied to the sliding surface (63a) depending on the size of the oil groove (83) on the orbiting roller and the excess supply of lubricating oil can be reduced.
    Furthermore, in the fourth aspect of the present invention, a portion of the oil in the oil groove (83) on the orbiting roller is also provided to the compression pockets (41). In this way, the lubricating oil from the oil groove (83) on the orbiting roller can also be used to lubricate the sliding areas on the caps (62, 72) in the compression pockets (41). In addition, oil is properly discharged reliably from the oil groove (83) onto the orbiting roller. The present configuration therefore reduces the accumulation of oil in the oil groove (83) on the orbiting roller. This setting also reduces the oil temperature rise in order to avoid a reduction in the lubricating characteristics, such as viscosity, of the lubricating oil, which is caused by the oil temperature rise. Furthermore, the oil groove (83) on the orbiting roller which communicates with the compression pockets (41) is disconnected from the oil groove (80) on the fixed roller. In this way, the present configuration can reduce a direct flow of oil in the oil groove (80) over the fixed roller in the compression pockets (41). Consequently, the present arrangement can prevent the heating of refrigerants supplied to the compression pockets (41) which occurs due to the excessive supply of lubricating oil to the compression pockets (41). BRIEF DESCRIPTION OF THE FIGURES
    Fig. 1 is a longitudinal sectional view of a roller compressor according to an embodiment.
    Fig. 2 is a longitudinal sectional view of a main part of the roller compressor according to the embodiment.
    Fig. 3 is a bottom view of a fixed roller of the roller compressor according to the embodiment. Fig. 3 illustrates a first state in which an oil groove on the fixed roller communicates with an oil groove on an orbiting roller.
    Fig. 4 is a bottom view of the fixed roller of the roller compressor according to the embodiment. Fig. 4 illustrates a first state in which the oil groove on the stationary roller is disconnected from the oil groove on the orbiting roller.
    Fig. 5 is a bottom view of the fixed roller of the roller compressor according to the embodiment. Fig. 5 illustrates a second state in which the oil groove on the fixed roller communicates with the oil groove on the orbiting roller.
    Fig. 6 is a bottom view of the fixed roller of the roller compressor according to the embodiment. Fig. 6 illustrates a second state in which the oil groove on the stationary roller is disconnected from the oil groove on the orbiting roller.
    Fig. 7 is a bottom view of a fixed roller of a roller compressor of an alternative example. Fig. 7 illustrates a state in which an oil groove on the fixed roller communicates with an oil groove on an orbiting roller.
    Fig. 8 is a bottom view of the fixed roller of the roller compressor of the alternative example. Fig. 8 illustrates a state in which the oil groove on the stationary roller is disconnected from the oil groove on the orbiting roller. DESCRIPTION OF ACHIEVEMENTS
    Embodiments of the present invention will be described in detail with reference to the figures.
    As illustrated in Figs. 1 and 2, a roller compressor (10) according to the present embodiment is provided in a refrigerant circuit of a vapor compression refrigerant cycle to compress a fluid refrigerant.
    The roller compressor (10) includes a casing (20), a motor (30) and a compression mechanism (40). The housing (20) accommodates the motor (30) and a compression mechanism (40). The casing (20) includes a long cylindrical portion and an airtight dome.
    The motor (30) includes a stator (31) attached to the housing (20) and a rotor (32) disposed within the stator (31). A drive shaft (11) is disposed through the rotor (32) and fixed thereto.
    The housing (20) has a lower part that serves as an oil reservoir (21) that stores lubricating oil. The casing (20) also has an upper part through which a suction pipe (12) and an intermediate part coupled to a discharge pipe (13) are arranged.
    A shelter (50) is attached to the housing (20) and disposed above the motor (30). The compression mechanism (40) is disposed above the shelter (50). The discharge pipe (13) includes a suction port disposed between the motor (30) and the shelter (50).
    The steering axis (11) is disposed longitudinally along the casing (20). The drive shaft (11) includes a main shaft (14) and an eccentric portion (15) coupled to an upper end of the main shaft (14). The main shaft (14) has a lower part fixed to the casing (20) by means of a lower bearing (22). The main shaft (14) has an upper part disposed through the shelter (50) and fixed to the upper bearing (51) of the shelter (50).
    The compression mechanism (40) includes a fixed roller (60) attached to an upper surface of the housing (50) and an orbiting roller (70) that interweaves with the fixed roller (60). The orbiting roller (70) is disposed between the stationary roller (60) and the shelter (50) and provided over the shelter (50).
    The shelter (50) has an outer periphery on which a ring-shaped part (52) is disposed. The shelter (50) also has an upper central part that is a recessed part (53). The housing (50) includes the upper bearing (51) below the recessed portion (53). The housing (50) is press-fitted to the housing (20). An inner peripheral surface of the housing (20) is in hermetic contact with an outer peripheral surface of the ring-shaped portion (52) of the housing (50) over the entire contact surface therebetween. The shelter (50) separates an inner side of the casing (20) into an upper space (23) which accommodates the compression mechanism (40) and a lower space (24) which accommodates the motor (30).
    The fixed roller (60) includes a back plate (61), an outer peripheral wall (63) and a cover (62). The outer peripheral wall (63) is generally cylindrical and rests on one end of a front surface (a lower surface in Figs. 1 and 2) of the back plate (61). The cover (62) is spiral (or involute) and stands within the outer peripheral wall (63) on the back plate (61). The back plate (61) is disposed on the outer peripheral side and is continuous with the cover (62). An end surface of the cover (62) is generally flat with an end surface of the outer peripheral wall (63). The fixed roller (60) is fixed to the shelter (50).
    The orbiting roller (70) includes a back plate (71), a cap (72) and a boss (73). The cap (72) is spiral (or involute) and disposed on a front surface (an upper surface in Figs. 1 and 2) of the back plate (71). The protrusion (73) is disposed over the center of a rear surface of the back plate (71). The boss (73) is coupled to the drive shaft (11) whose eccentric part (15) is arranged inside the boss (73).
    The cap (62) of the fixed roller (60) interweaves with the cap (72) of the orbiting roller (70). There are compression pockets (41) between the cap (62) of the stationary roller (60) and the cap (72) of the orbiting roller (70). That is, as shown in Fig. 3, the fixed roller (60) includes a cap groove (64) between the outer peripheral wall (63) and the cap (62). The orbiting roller (70) also includes a cap groove (74) along the cap (72). Cover slots (64, 74) serve as compression pockets (41).
    A suction port (not shown) is provided on the outer peripheral wall (63) of the fixed roller (60). The suction port is connected at one end down the flow of the suction pipe (12).
    An discharge port (65) is provided over the center of the back plate (61) of the fixed roller (60). A high pressure chamber (66) to which the discharge port (65) opens is provided on a rear surface (an upper surface in Figs. 1 and 2) of the back plate (61) of the fixed roller (60). The high pressure chamber (66) communicates with a lower space (24) through a passage (not shown) in the back plate (61) of the fixed roller (60) and a passage (not shown) in the shelter (50) . In this way, a high pressure refrigerant compressed by the compression mechanism (40) flows into the lower space (24) such that the lower space (24) is in a high pressure atmosphere.
    The drive shaft (11) includes a lubrication passage (16) therein. The lubrication passage (16) extends from a lower end to an upper end of the drive shaft (11). The lower end of the drive shaft (11) is immersed in the oil reservoir (21). The lubrication passage (16) supplies lubricating oil in the oil reservoir (21) to the lower bearing (22) and the upper bearing (51). The lubrication passage (16) also supplies the lubricating oil to a sliding surface between the boss (73) and the drive shaft (11). In addition, the lubrication passage (16), which opens to an upper rear surface of the drive shaft (11), supplies the lubricating oil to a higher location than the drive shaft (11).
    The ring-shaped portion (52) of the shelter (50) has an upper inner periphery on which a sealing member (not shown) is disposed. A back pressure part (42) which is a space under high pressure is arranged closer to the center of the roller compressor than the sealing member. An intermediate pressure part (43) which is a space under intermediate pressure is disposed farther from the center of the roller compressor than the sealing member. In other words, the back pressure part (42) is mainly found in the recessed part (53) of the shelter (50). The recessed part (53) communicates with the lubrication passage (16) on the drive shaft (11) via an inner side of the boss (73) of the orbiting roller (70). The back pressure portion (42) receives high pressure corresponding to a discharge pressure from the compression mechanism (40) and this high pressure pushes the orbiting roller (70) towards the stationary roller (60).
    The intermediate pressurized portion (43) includes a pressurized portion (44) closest to the orbiting roller and a pressurized portion (45) closest to the stationary roller. The pressurized portion (44) closest to the orbiting roller covers a portion or an outer periphery of the rear surface of the backplate (71) of the orbiting roller (70) and a side face of the backplate (71). This means that the pressurized part (44) closest to the orbiting roll is arranged outside the backpressure part (42) and the intermediate pressure on the pressurized part (44) pushes the orbiting roll (70) towards the stationary roll (60).
    The pressurized part (45) closest to the fixed roller is arranged outside the fixed roller (60) in the upper space (23). The pressurized part (45) closest to the fixed roller communicates with the pressurized part (44) closest to the orbiting roller through a space between the outer peripheral wall (63) on the back plate (61) of the fixed roller ( 60) and the casing (20).
    The shelter (50) includes a rotation stop (46) to prevent rotation of the roll in orbit (70). The rotation stop (46), which is, for example, Oldham coupling, is arranged on the upper surface of the ring-shaped part (52) in the housing (50) and is in sliding contact with the back plate (71 ) of the orbiting roller (70) and the shelter (50).
    The back plate (71) of the orbiting roller (70) includes an oil hole (75) therein. The oil hole (75) extends along the radius of the backplate (71) and includes an inner end, which is one end of the oil hole (75). The inner end communicates with a lower part (an upper part in Fig. 2) of the boss (73). A screw is disposed inside the oil hole (75). A small hole (76) is disposed on the outer periphery of the back plate (71). The small hole (76) is arranged in a position external to the cap (72) and opens to a portion above the back plate (71). This means that the oil hole (75) supplies lubricating oil under high pressure, supplied to an upper end of the lubrication passage (16) of the drive shaft (11), from the inner side of the boss (73) to a surface between the back plate (71) of the orbiting roller (70) and the back plate (61) of the stationary roller (60).
    An adjustment slot (47) is disposed on the stationary roller (60) and the orbiting roller (70) to supply an intermediate pressure coolant to the intermediate pressure portion (43). The adjustment slot (47) includes a primary passage (48) disposed over the stationary roller (60) and a secondary passage (49) disposed over the orbiting roller (70). The primary passage (48) is disposed on a lower surface of the outer peripheral wall (63) of the fixed roller (60). The primary passage (48) includes an inner end that opens to an inner end of the outer peripheral wall (63). The primary passage (48) communicates with the compression pockets (41) under intermediate pressure, where the cap (72) of the orbiting roller (70) is in contact with the outer peripheral wall (63).
    On the other hand, the bypass (49) is a hole arranged from a front surface to a rear surface of the outer periphery of the back plate (71) of the orbiting roller (70). The secondary passage (49) is a round hole whose cross section (cross section perpendicular to the axis of the round hole) has a circle shape. Alternatively, the bypass (49) may have a cross section that is ellipse-shaped or arc-shaped. The secondary passage (49) includes an upper end that intermittently communicates with an outer end of the primary passage (48). The secondary passage (49) includes a lower end that communicates with the intermediate pressure portion (43) between the orbiting roller (70) and the shelter (50). This means that the compression pockets (41) under intermediate pressure supply refrigerant under intermediate pressure to the part under intermediate pressure (43) which is in a fixed intermediate pressure atmosphere.
    Fixed Roller and In-orbit Roller Oil Groove Configurations: As shown in Fig. 3, the fixed roller (60) includes an oil groove (80). The oil groove (80) on the fixed roller is disposed on a front surface (a lower surface in Fig. 2) of the outer peripheral wall (63) disposed on the back plate (61) of the fixed roller (60). The oil groove (80) on the fixed roller includes a longitudinal hole (81) and a surrounding groove (82) which passes through the longitudinal hole (81). The longitudinal hole (81) communicates with the small hole (76) over the oil hole (75) of the orbiting roller (70) to supply lubricating oil under high pressure to the neighboring groove (82). The neighboring groove (82) is disposed along one end of an inner periphery of the outer peripheral wall (63). This means that the oil groove (80) on the fixed roller is disposed along the end of the inner periphery of the outer peripheral wall (63) on the fixed roller (60). The oil groove (80) on the fixed roller is also disposed on a surface of the outer peripheral wall (63), which is in sliding contact with the back plate (71) of the orbiting roller (70).
    The neighboring slot (82) includes a first arc-shaped slot (82a) that extends from the longitudinal hole (81) to an end (counterclockwise in Fig. 3) of the neighboring slot (82). The neighboring slot (82) also includes a second arc-shaped slot (82b) that extends from the longitudinal hole (81) to the other end (clockwise in Fig. 3) of the neighboring slot (82). The distance between the second arc-shaped groove (82b) and the end of the inner periphery of the outer peripheral wall (63) gradually falls clockwise in Fig. 3.
    As shown in Fig. 3, the orbiting roller (70) includes an oil groove (83). The oil groove (83) on the orbiting roller is disposed on the front surface (the upper surface in Fig. 2) of the outer periphery of the back plate (71) on the orbiting roller (70). The oil groove (83) on the orbiting roller is disposed along the outer periphery end of the back plate (71) on the orbiting roller (70). The oil groove (83) on the orbiting roller includes a communication groove (83a) and an expansion groove (83b) continuously provided with the communication groove (83a). The communication slot (83a) is a generally arc-shaped slot that is curved outwardly towards the compression pockets (41). The expansion slot (83b) is a straight slot that is farther from the center of the back plate (71) than the communication slot (83a). This means that the oil groove (83) on the orbiting roller includes the communication groove (83a) which is slightly bent as opposed to the expansion groove (83b), such that the communication groove (83a) is arranged closer to the center of the back plate (71) than the expansion slot (83b). The expansion slot (83b) and the communication slot (83a) can be generally straight.
    In eccentric orbital motion of the orbiting roller (70), the oil groove (83) on the orbiting roller moves between a position in which the oil groove (83) on the orbiting roller communicates with the groove. of oil (80) on the fixed roller (for example, the positions illustrated in Figs. 3 and 5) and a position in which the oil groove (83) on the orbiting roller is disconnected from the oil groove (80) on the fixed roller (for example, the positions illustrated in Figs. 4 and 6). Furthermore, the oil groove (83) on the orbiting roller according to the present embodiment communicates with the compression pocket (41) in the position in which the oil groove (83) on the orbiting roller is disconnected. of the oil groove (80) on the fixed roller (for example, the position shown in Fig. 6). The oil groove (83) on the orbiting roller, which communicates with the oil groove (80) on the fixed roller, extends from one end of the oil groove (80) on the fixed roller. along the periphery of the back plate (71). Operation: The operation of the roller compressor (10) will be described below.
    The motor (30) allows the orbiting of the roller in orbit (70) of the compression mechanism (40). The orbiting roller (70), whose rotation is prevented by the rotation hanger (46), enters into orbit only eccentrically about an axis of the drive axis (11). In eccentric orbital motion of the orbiting roller (70), the compression pockets (41) which fall in volume towards the center compress a refrigerant gas withdrawn from the suction pipe (12). Compressed refrigerant gas is discharged into the chamber under high pressure (66) through the discharge port (65) of the fixed roller (60). High pressure refrigerant gas in the high pressure chamber (66) flows into the lower space (24) through passages in the fixed roller (60) and the housing (50). The refrigerant in the lower space (24) is discharged to the outside of the casing (20) through the discharge pipe (13).
    The lower space (24) in the housing (20) maintains its pressure as high as the refrigerant to be discharged. The oil reservoir (21) also holds the lubricating oil under high pressure. The high pressure lubricating oil in the oil reservoir (21) flows from the lower end to the upper end of the lubrication passage (16) of the drive shaft (11). Then, the lubricating oil under high pressure flows from an opening arranged on an upper end of the eccentric part (15) of the drive shaft (11) to the inner side of the boss (73) of the orbiting roller (70). Oil supplied to the boss (73) lubricates the sliding surface between the boss (73) and the eccentric part (15) of the drive shaft (11). Consequently, an atmosphere under high pressure corresponding to the discharge pressure is supplied from the inner side of the boss (73) to the back pressure part (42). This high pressure pushes the orbiting roller (70) towards the stationary roller (60).
    There is the compression pocket (41) closest to the inner periphery of the outer peripheral wall (63) of the fixed roller (60) in a state in which the cover (72) of the orbiting roller (70) is in contact with the outer peripheral wall (63) of the fixed roller (60). This compression pocket (41) drops in volume towards the center. This outermost compression pocket (41) communicates with the primary passage (48) of the adjustment slot (47). When the compression pocket (41) is under predetermined intermediate pressure, the secondary passage (49) of the adjustment slot (47) communicates with the primary passage (48). Consequently, an intermediate pressure coolant is supplied to the pressurized portion (44) closest to the orbiting roller and the pressurized portion (45) closest to the stationary roller. In this way, atmosphere under intermediate pressure is provided over the rear surface of the orbiting roller (70) and around the stationary roller (60). This intermediate pressure and high pressure push the orbiting roller (70) towards the stationary roller (60).
    Oil supplied to the boss (73) flows into the oil groove (80) on the stationary roller (60) through the oil hole (75) of the orbiting roller (70). Lubricating oil under high pressure in the oil groove (80) on the fixed roller is supplied to a sliding contact surface between the lower surface of the outer peripheral wall (63) of the fixed roller (60) and the back plate (71) of the orbiting roller (70) to lubricate the propulsion surface.
    Furthermore, in eccentric orbital motion of the orbiting roller (70), lubricating oil under high pressure on the oil groove (80) on the stationary roller is suitably supplied to the oil groove (83) on the orbiting roller. This operation will be described in detail with reference to Figs. 3-6.
    The orbiting roller (70) with the center shifted to a slightly left side in Fig. 3 allows one end of the communicating groove (83a) of the oil groove (83) on the orbiting roller to overlap axially (at longitudinal direction of Fig. 3) to one end of the second arc-shaped groove (82b) of the oil groove (80) on the fixed roller. Consequently, lubricating oil under high pressure in the oil groove (80) on the stationary roller is supplied and loaded into the oil groove (83) on the orbiting roller. The amount of lubricating oil loaded depends on the volume of the oil groove (83) on the orbiting roller.
    The orbiting roller (70), which circulates eccentrically counterclockwise from the position in Fig. 3, with the center shifted to a slightly lower side in Fig. 4, disconnects the oil groove (80) over the roller fixed from the oil groove (83) on the roller in orbit. The orbiting roller (70) in this position allows the lubricating oil in the oil groove (83) on the orbiting roller to lubricate the drive surface around the oil groove (83) on the orbiting roller. At this time, the lubricating oil in the oil groove (83) on the orbiting roller may leak towards the outer periphery of the back plate (71) of the orbiting roller (70). In this situation, however, oil does not leak much from the oil groove (83) on the orbit roller to the outside, as the oil groove (83) on the orbit roller is disconnected from the oil groove (80) on the fixed roller.
    The orbiting roller (70), which runs eccentrically counterclockwise from the position in Fig. 4, with the center shifted to a slightly right-hand side in Fig. 5, allows the end of the communication slot (83a) of the oil groove (83) on the orbiting roller again axially overlaps (in the longitudinal direction of Fig. 3) with the end of the second arc-shaped groove (82b) of the oil groove (80) on the fixed roller. Consequently, lubricating oil under high pressure in the oil groove (80) on the stationary roller is again supplied and charged to the oil groove (83) on the orbiting roller. The amount of lubricating oil loaded depends on the volume of the oil groove (83) on the orbiting roller.
    The orbiting roller (70), which circulates eccentrically counterclockwise from the position in Fig. 5, with the center shifted to a slightly higher side in Fig. 6, disconnects the oil groove (80) over the fixed oil groove roller (83) on the orbiting roller. At the same time, the oil groove (83) on the orbiting roller communicates with the compression pocket (41) which is pumping a refrigerant. Consequently, differential pressure between the oil groove (83) on the orbiting roller and the compression pockets (41) allows the lubricating oil in the oil groove (83) on the orbiting roller to be supplied in the compression pockets (41 ). Consequently, this lubricating oil can be used to lubricate the caps (62, 72) in the compression pockets (41). As described above, the oil groove (83) on the orbiting roller, which communicates with the compression pockets (41), is disconnected from the oil groove (80) on the stationary roller. In this way, the compression pockets (41) can pump lubricating oil the amount of which corresponds at most to the volume of the oil groove (83) on the orbiting roller. This means that, in Fig. 6, the lubricating oil in the oil groove (80) on the fixed roller is not directly supplied to the compression pockets (41) via the oil groove (83) on the orbiting roller. Consequently, the present arrangement can reduce heating of pumped refrigerants due to excessive supply of lubricating oil to the compression pockets (41). Note that in Fig. 6 the primary passage (48) overlaps axially and communicates with the secondary passage (49). In this way, the intermediate pressure refrigerant in the compression pockets (41) is supplied to the intermediate pressure part (43) through the primary passage (48) and the secondary passage (49) and the intermediate pressure part (43) holds its atmosphere under fixed intermediate pressure.
    The orbiting roller (70) which has returned from the position of Fig. 6 to that of Fig. 3 allows the supply of lubricating oil under high pressure in the oil groove (80) over the fixed roller to the oil groove (83) over the roll in orbit. The orbiting roller (70) which repeats the eccentric orbital movement in the order of Figs. 3, 4, 5 and 6 allows for the proper use of properly supplied lubricating oil to the oil groove (83) on the orbiting roller to lubricate the drive surface and the sliding area over the compression pockets (41). ADVANTAGES OF ACHIEVEMENT
    In the embodiment described above, the oil groove (83) on the orbiting roller is disposed on the back plate (71) of the orbiting roller (70). The oil groove (83) on the orbiting roller also extends from the end of the oil groove (80) on the stationary roller. This configuration reduces the leakage of lubricating oil under high pressure to the outside of the backplate (71) and also increases the lubrication area over the drive surface corresponding to the outer peripheral wall (63). This means that this configuration can improve the lubrication characteristics between the fixed roller (60) and the orbiting roller (70) and the reliability of the roller compressor (10).
    Particularly, in the embodiment described above, as illustrated in Figs. 3-6, in eccentric orbital motion of the orbiting roller (70), lubricating oil in the oil groove (80) on the stationary roller is intermittently supplied to the oil groove (83) on the orbiting roller. In this way, a fixed amount of lubricating oil is suitably supplied to the propulsion surface corresponding to the outer peripheral wall (63) of the fixed roller (60). Consequently, lubricating oil can be quantitatively supplied to the sliding surface (63a) depending on the size of the oil groove (83) on the orbiting roller and the excess supply of lubricating oil can be reduced.
    Furthermore, in the embodiment described above, a part of the oil in the oil groove (83) on the orbiting roller is also provided to the compression pockets (41). In this way, the lubricating oil from the oil groove (83) on the orbiting roller can also be used to lubricate the sliding areas on the caps (62, 72) in the compression pockets (41). In addition, oil is properly discharged reliably from the oil groove (83) onto the orbiting roller. The present configuration therefore reduces the accumulation of oil in the oil groove (83) on the orbiting roller. This setting also reduces the oil temperature rise in order to avoid a reduction in the lubricating characteristics, such as viscosity, of the lubricating oil, which is caused by the oil temperature rise. Furthermore, the oil groove (83) on the orbiting roller which communicates with the compression pockets (41) is disconnected from the oil groove (80) on the fixed roller. In this way, the present configuration can reduce the direct flow of oil in the oil groove (80) over the fixed roller to the compression pockets (41). Consequently, the present arrangement can also avoid the heating of refrigerants pumped into the compression pockets (41) which occurs due to the excessive supply of lubricating oil to the compression pockets (41). Alternative example of realization:
    Figs. 7 and 8 illustrate an alternative example of an oil groove (83) on an orbiting roller of a roller compressor (10). In this alternative example, similarly to the embodiment described above, the oil groove (83) on the orbiting roller, which communicates with an oil groove (80) on the fixed roller, extends from one end. of the oil groove (80) on the fixed roller along a periphery of a back plate (71). In the alternative example, a communication groove (83a) of the oil groove (83) on the orbiting roller is located farther from the center of the back plate (71) than the communication groove (83a) in the above-described embodiment. . This means that, in the alternative example, the oil groove (83) on the orbiting roller includes the communication groove (83a) and an expansion groove (83b) which extend generally in the same direction. In this alternative example, similarly to the embodiment described above, in eccentric orbital motion of the orbiting roller (70), the oil groove (83) on the orbiting roller moves between a position at which the oil groove (83) ) on the orbiting roller communicates with the oil groove (80) on the stationary roller (eg a position shown in Fig. 7) and a position at which the oil groove (83) on the orbiting roller is disconnected from the oil groove (80) on the stationary roller (eg a position illustrated in Fig. 8). Furthermore, in the alternative example, when the oil groove (80) on the fixed roller is in the closest position with respect to the compression pockets (41) (such as a position in Fig. 7), the oil groove (83) ) on the orbiting roller does not communicate directly with the compression pockets (41).
    In the alternative example described above, lubricating oil suitably supplied from the oil groove (80) on the fixed roller to the oil groove (83) on the orbiting roller is actively used to lubricate the propulsion surface on the outer peripheral wall ( 63). In this way, the present configuration can improve the lubrication characteristics on that propulsion surface and increase the reliability of the roller compressor (10). Note that the roller compressor (10) in the alternative example preferably includes an oil supplier for individual supply of lubricating oil to the compression pockets (41). Another achievement:
    Another realization might be as follows. Unlike scroll compressor (10), in the embodiment described above, which compresses a refrigerant in a cooler that includes a refrigerant circuit, a scroll compressor (10) in the present embodiment may comprise another fluid.
    Furthermore, the shape of an oil groove (83) on an orbiting roller in the present embodiment may be different from the embodiment described above. Specifically, in each of the embodiments described above, the oil groove (83) on the orbiting roller, which communicates with the oil groove (80) on the stationary roller, extends from one end of the groove. of oil (80) on the fixed roller along the periphery of the back plate (71). Alternatively, the oil groove (83) on the orbiting roller may extend along the diameter of the backplate (71). The shape of the oil groove (83) on the orbiting roller can be a perfect circle or an ellipse. INDUSTRIAL APPLICABILITY:
    As described above, the present invention relates to roller compressors, more particularly a lubrication structure. DESCRIPTION OF REFERENCE CHARACTERS
    10 Roller compressor 40 Compression mechanism 41 Compression pockets 60 Fixed roller 61 Back plate (with fixed roller) 62 Cover (with fixed roller) 5 63 Outer peripheral wall 70 Roll in orbit 71 Back plate (with roller in orbit) 72 Cover (from orbiting roller) 80 Oil slot on fixed roller 10 83 Oil slot on orbiting roller
    权利要求:
    Claims (4)
    [0001]
    1. ROLLER COMPRESSOR, comprising: a compression mechanism (40), including: - a fixed roller (60) including: - a back plate (61); - an outer peripheral wall (63) standing on one end of the back plate (61); and - a cover (62) standing inside the outer peripheral wall (63); - an orbiting roller (70) including: - a back plate (71) in sliding contact with one end of the cap (62) of the fixed roller (60) and one end of the outer peripheral wall (63); and - a cover (72) standing on the back plate (71); - an oil groove (80) on the fixed roller: - arranged on an outer peripheral wall surface (63) of the fixed roller (60), which is in sliding contact with the rear plate (71) of the orbiting roller ( 70), - extending along an inner periphery of the outer peripheral wall (63); and - receiving lubricating oil under high pressure corresponding to the discharge pressure of the compression mechanism (40); and - an oil groove (83) on the orbiting roller; - arranged on a surface of the back plate (71) of the orbiting roller (70), which is in sliding contact with the outer peripheral wall (63) of the fixed roller (60); and - which is able to communicate with the oil groove (80) on the fixed roller, characterized in that when the oil groove (80) on the fixed roller communicates with the oil groove (83) on the roller at orbit, lubricating oil under high pressure in the oil groove (80) on the fixed roller is supplied to the oil groove (83) on the orbiting roller.
    [0002]
    2. ROLLER COMPRESSOR according to claim 1, characterized in that the oil groove (83) on the orbiting roller extends from one end of the oil groove (80) on the roller fixed to the along a periphery of the back plate (71).
    [0003]
    3. ROLLER COMPRESSOR according to any one of claims 1 or 2, characterized in that, in eccentric orbital movement of the orbiting roller (70), the oil groove (83) on the orbiting roller moves between a position in which the oil groove (83) on the orbiting roller communicates with the oil groove (80) on the stationary roller and a position in which the oil groove (83) on the orbiting roller is disconnected from the oil groove (80) on the fixed roller.
    [0004]
    4. ROLLER COMPRESSOR according to claim 3, characterized in that the oil groove (83) on the orbiting roller, which is disconnected from the oil groove (80) on the fixed roller, communicates with a compression pocket (41) between the fixed roller (60) and the orbiting roller (70).
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    同族专利:
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    WO2012127795A1|2012-09-27|
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-07| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-05-11| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-06-01| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 06/03/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011064599A|JP5152359B2|2011-03-23|2011-03-23|Scroll compressor|
    JP2011-064599|2011-03-23|
    PCT/JP2012/001513|WO2012127795A1|2011-03-23|2012-03-06|Scroll-type compressor|
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