• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    lubricant control valve for screw compressor the present invention relates to a compressor system that includes a lubricant reservoir, a screw compressor and a valve. the screw compressor includes a housing that defines a compression chamber that has a suction port, a discharge port, a first lubricant feed opening located between the suction port and the discharge port, and a second feed port lubricant located between the discharge opening and the first lubricant feed opening. the valve is in fluid communication with the lubricant reservoir, the first lubricant feed opening through a first lubricant feed passage, and the second lubricant feed opening through a second lubricant feed passage. the valve is movable between a first position and a second position. in the first position, the valve fluidly connects the lubricant reservoir in the first lubricant feed passage to direct the lubricant to the first lubricant feed opening. in the second position, the valve fluidly connects the lubricant reservoir in the second lubricant feed passage to direct the lubricant to the second lubricant feed opening.
    公开号:BR112013020408B1
    申请号:R112013020408-7
    申请日:2012-02-08
    公开日:2021-03-30
    发明作者:Joseph Heger；Robert Mayfield
    申请人:Trane International Inc；
    IPC主号:
    专利说明:

    BACKGROUND
    [0001] The present invention relates to screw compressors and, more specifically, valves for screw compressors.
    [0002] Screw compressors often include an oil injection system to inject oil into the compression chambers and compressor bearings. Oil injection systems provide lubrication, cooling, and improved sealing within the compression chambers. Oil compression systems often use refrigeration system pressures, including compressed fluid pressures and oil pressures, to inject oil into the compression chambers and compressor bearings. For example, oil can be injected as a result of the pressure difference between the system discharge pressure and the pressure at the injection port. The oil is typically not injected during operating states where the system pressure is equal to or less than the pressure at the injection port.
    [0003] To improve compressor efficiency, it is sometimes desirable to inject the oil into the compression chamber in an injection port that is close to the compressor discharge port. However, a disadvantage of locating the injection port near the compressor discharge port is that relatively high pressures within the compression chamber can prevent oil from being injected when the oil pressure is relatively low. As such, many current oil injection systems locate the injection port closest to the compressor's suction port, sacrificing efficiency in order to reduce the possibility of no oil being injected into the compression chamber.
    [0004] GB1237333 refers to screw compressors with screwed interlacing rotors, in which a slide is driven in different positions by an engine or manually by means of a flywheel.
    [0005] DE 2720214, in turn, refers to a rotary screw or vane compressor in which one or two atomizing nozzles (30f, 30m) for the male (7) and female (8) rotors are added to the flat injection nozzle (5). Each atomizer nozzle has a fine jet through which a stream of oil is squirted against a cross pin, so that a fine mist of oil is produced. SUMMARY
    [0006] In one embodiment, the invention provides a compressor system that includes a lubricant reservoir adapted to contain a lubricant and a screw compressor. The screw compressor includes a housing that defines a compression chamber that has a suction port, a discharge port, a first lubricant feed opening located between the suction port and the discharge port, and a second feed port lubricant located between the discharge opening and the first lubricant feed opening. The screw compressor also includes a drive rotor supported by the housing and disposed within the compression chamber, and an idle rotor supported by the housing and disposed within the compression chamber. The idle rotor driven by the drive rotor to compress and move the fluid in a direction of increasing pressure from the suction port to the discharge port creating pressure in a first pressure region. The compressor system also includes a valve in fluid communication with the lubricant reservoir, the first lubricant feed opening through a first lubricant feed passage, and the second lubricant feed opening through a second feed passage of lubricant. The movable valve between a first position and a second position based on the pressure in the first pressure region. In the first position, the valve fluidly connects the lubricant reservoir to the first lubricant feed passage to direct the lubricant to the first lubricant feed opening. In the second position, the valve fluidly connects the lubricant reservoir to the second lubricant feed passage to direct the lubricant to the second lubricant feed opening.
    [0007] In another embodiment, the invention provides a method for operating a compressor system. The compressor system includes a lubricant reservoir adapted to contain a lubricant and a screw compressor. The screw compressor includes a housing that defines a compression chamber that has a suction port, a discharge port, a first lubricant feed opening located between the suction port and the discharge port, and a second feed port lubricant located between the discharge opening and the first lubricant feed opening. The method includes providing a valve in fluid communication with the lubricant reservoir, the first lubricant feed opening through a first lubricant feed passage, and the second lubricant feed opening through a second lubricant feed passage . The method also includes compressing and moving the fluid in a direction of increasing pressure from the suction port to the discharge port creating pressure in a first pressure region, moving the valve between a first position and a second position based on the pressure in the first pressure region, fluidly connect the lubricant reservoir to the first lubricant feed passage when the valve is in the first position to direct the lubricant to the first lubricant feed opening of the screw compressor, and fluidly connect the lubricant reservoir to the second lubricant feed passage when the valve is in the second position to direct the lubricant to the second screw compressor lubricant feed opening.
    [0008] These and other aspects of the various modalities of the invention, together with their organization and operation, will be apparent from the following detailed description when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
    [0009] Figure 1 is a schematic of a refrigeration system that includes a compressor system that incorporates aspects of the invention, the compressor system including a valve in a first position.
    [00010] Figure 2 is the diagram of the cooling system shown in Figure 1 with the valve in a second position.
    [00011] Figure 3 is a perspective view of the compressor system.
    [00012] Figure 4 is a cross-sectional view of a portion of the compressor system made along section line 4-4 of Figure 3.
    [00013] Figure 5 is a schematic of a refrigeration system that includes another modality of a compressor system, the compressor system including a valve in a first position.
    [00014] Figure 6 is the schematic of the cooling system shown in Figure 5 with the valve in a second position.
    [00015] Figure 7 is a schematic of a refrigeration system that includes yet another modality of a compressor system, the compressor system including a valve in a first position.
    [00016] Figure 8 is the diagram of the cooling system shown in Figure 7 with the valve in a second position.
    [00017] Figure 9 is a schematic of a refrigeration system that includes yet another modality of a compressor system, the compressor system including a valve in a first position.
    [00018] Figure 10 is the diagram of the cooling system shown in Figure 9 with the valve in a second position. DETAILED DESCRIPTION
    [00019] Before any modality of the invention is explained in detail, it should be understood that the invention is not limited in its application to the details of construction and arrangement of components presented in the following description or illustrated in the following drawings. The invention is capable of other modalities and of being practiced or of being executed in several ways. Also, it should be understood that the phraseology and terminology used herein are for the purpose of illustrating and describing one or more examples of the invention and are not to be considered as limiting. It is possible that the invention could be incorporated in forms not specifically described herein.
    [00020] Figures 1 and 2 illustrate a compressor system 10 that incorporates the invention. In the illustrated embodiment, the compressor system 10 is part of a refrigeration system 14 that is operable to circulate a refrigerant to cool an area. Although the illustrated compressor system 10 is described for use with the cooling system 14, in other embodiments, the compressor system 10 can be part of other systems or processes that require a compressed fluid, such as, for example, gas applications natural or air-operated construction machinery.
    [00021] In addition to the compressor system 10, the cooling system 14 includes a condenser 18, an expansion valve 22, and an evaporator 26. The compressor system 10 comprises a refrigerant and supplies the compressed refrigerant to the condenser 18. The Condenser 18 receives the compressed refrigerant and removes heat from the refrigerant. The expansion valve 22 receives the refrigerant from the condenser 18 and directs the refrigerant to the evaporator 26. As the refrigerant passes through the expansion valve 22, the refrigerant decreases in pressure and temperature. The evaporator 26 receives the cold refrigerant from the expansion valve 22 and facilitates the heat exchange between the refrigerant and a secondary fluid (e.g., air) or structure. The refrigerant is then circulated back to the compressor system 10 for compression.
    [00022] In the illustrated embodiment, the compressor system 10 includes a lubricant reservoir 30, a screw compressor 34, and a control valve 38. The lubricant reservoir 30 is positioned between the condenser 18 and the screw compressor 34 for contain or store lubricant (for example, oil) until needed. The lubricant reservoir 30 includes a separator for separating the lubricant from the refrigerant during the operation of the cooling system 14. In some embodiments, the separator can be, for example, a centrifugal separator, a coalescent plate separator, or the like.
    [00023] The illustrated screw compressor 34 includes a compressor housing 42, a motor 46, a drive rotor 50, and an idle rotor 54. Although compressor 34 is illustrated and described as a screw compressor having two rotors 50 , 54, in other embodiments, compressor 34 may be a three-motor compressor, a door rotor compressor, or the like. The compressor housing 42 defines a compression chamber 58 that has a suction opening 62, a discharge opening 66, a first lubricant feed opening 70 located between the suction opening 62 and the discharge opening 66, and a second lubricant supply opening 74 located between the discharge port 66 and the first lubricant supply opening 70. the suction port 62 is in fluid communication with the evaporator 26 to receive the refrigerant from the evaporator 26 and direct and direct the refrigerant into the compression chamber. The discharge opening 66 is in communication with the lubricant reservoir 30 to supply compressed refrigerant and compression chamber lubricant 58 to the reservoir 30.
    [00024] In the illustrated embodiment, motor 46 is positioned inside compressor housing 42 and coupled to drive rotor 50. In other embodiments, motor 46 may only be partially located inside compressor housing 42 or it may be supported outside the housing 42. The motor 46 drives (for example, rotates) the drive rotor 50 to compress the refrigerant, or other fluids, into the compression chamber 58 and move the refrigerant from the suction opening 62 to the discharge opening 66.
    [00025] The drive rotor 50 and the idle rotor 54 are supported by the compressor housing 42 and arranged inside the compression chamber 58. The illustrated drive rotor 50 includes a screw 78 and an axis 82. The axis 82 is coupled to the motor 46 for rotation by motor 46. Similar to drive rotor 50, idle rotor 54 includes a screw 86 and an axle (not shown). The screw 86 of the idle rotor 54 meshes with the screw 78 of the drive rotor 50 so that the drive rotor 50 drives the idle rotor 54 when the drive rotor 50 is rotated by the motor 46. Depending on the drive rotor 50 and the idle rotor 54 rotates, screws 78, 86 compress the refrigerant inside the compression chamber 58 and move the refrigerant in an increasing pressure direction P from the suction opening 62 to the discharge opening 66.
    [00026] The screw compressor 34 illustrated also includes bearings 94, 98 that support drive rotor 50 and idle rotor 54. Bearings 94, 98 are supported within compressor housing 42 and surround portions of shafts 82 adjacent to the opening suction cups 62 and the shaft portions 82 adjacent to the discharge opening 66. Bearings 94, 98 facilitate the rotation of rotors 50, 54 with respect to compressor housing 42. The illustrated compressor housing 42 defines a feed supply opening bearing 100 for supplying lubricant for bearings 94 adjacent to suction opening 62 during operation of compressor system 10. In some embodiments, compressor housing 42 may also define a bearing feed opening for supplying lubricant for bearings 98 adjacent to the discharge opening 66.
    [00027] The control valve 38 is positioned in fluid communication between the lubricant reservoir 30 and the screw compressor 34 to selectively direct the lubricant from reservoir 30 to the lubricant supply openings 70, 74. The illustrated valve 38 is movable between a first position (Figure 1), in which the lubricant is directed to the first lubricant feed opening 70 of the compressor 34, and a second position (Figure 2), in which the lubricant is directed to the second feed opening of lubricant 74 from compressor 34. The first lubricant feed opening 70 is located in a relatively low volume ratio (VR) section of the compression chamber 58 (for example, in a VR of approximately 1.1). The second lubricant feed opening 74 is located in a higher VR section of the compression chamber 58 (for example, a VR greater than 2). The first and second lubricant supply openings 70, 74 are in communication with the lubricant reservoir 30 through valve 38 to supply lubricant from reservoir 30 to the compression chamber 58.
    [00028] In the illustrated embodiment, valve 38 is a spool valve and includes valve housing 102, a spool 106, and a tension member 110. In other embodiments, other suitable types of valves may alternatively be employed. The valve housing 102 defines a cavity 114 that receives the spool 106, an inlet 118, and a plurality of outlet 122, 126. Inlet 118 is in communication with the lubricant reservoir 30 through an inlet passage 130 to supply the lubricant from reservoir 30 to cavity 114. The first outlet 122 is in communication with the first lubricant feed opening 70 through a first lubricant feed passage 134 to supply the lubricant from cavity 114 to the first lubricant feed opening 70. The second outlet 126 is in communication with the second lubricant supply opening 74 through a second lubricant supply passage 138 to supply the lubricant from cavity 114 to the second lubricant supply opening 74. In the illustrated embodiment, a orifice or restriction 142 is positioned within each passage 134, 138 to limit the flow of fluid through the passages ens 134, 138.
    [00029] Figures 3 and 4 illustrate the compressor housing 42 and the valve 38 in more detail. In the illustrated embodiment, the valve 38 is mounted (for example, screwed, welded, etc.) directly on the compressor housing 42. In such embodiments, the lubricant supply passages 134, 138 are direct connections formed by the alignment of the outlets 122, 126 in valve housing 110 with openings 70, 74 in compressor housing 42. In other embodiments, valve 38 may be coupled to, but spaced from, compressor housing 42. In such embodiments, the lubricant feed passages 134, 138 may be separate ducts or lines extending between valve housing 10 and compressor housing 42.
    [00030] Referring back to Figures 1 and 2, the spool 106 is movable within cavity 114 with respect to valve housing 102 to selectively open and close (e.g., unlock and lock) outlets 122, 126. As shown in Figure 1, the spool 106 moves or slides to the first position to open the first outlet 122 and block the second outlet 126. In this position, valve 38 fluidly connects the lubricant reservoir in the first lubricant feed passage 134 to direct the lubricant for the first lubricant feed opening 70. As shown in Figure 2, the spool 106 moves or slides to the second position to open the second outlet 126 and block the first outlet 122. In this position, valve 38 fluidly connects the lubricant reservoir in the second lubricant feed passage 138 to direct the lubricant to the second lubricant feed opening 74.
    [00031] In the illustrated mode, the spool 106 is actuated between the first and second positions based on a difference in pressure between a pressure in a first pressure region and a pressure in a second pressure region. In the embodiment shown in Figures 1 and 2, the first pressure region includes the lubricant reservoir 30 and the second pressure region includes a portion of the compression chamber 58 adjacent to the second lubricant supply opening 74. The pressure inside the oil reservoir lubricant 30 is substantially the same as the pressure in the discharge opening 66 of the compressor 34. The spool 106 moves to the first position (Figure 1) when the pressure inside the compression chamber 58 adjacent to the second lubricant supply opening 74 is greater than or equal to the pressure within the lubricant reservoir 30 (i.e., when the pressure in the second pressure region is greater than or equal to the pressure in the first pressure region). The spool 106 moves to the second position (Figure 2) when the pressure inside the lubricant reservoir 30 is greater than the pressure inside the compression chamber 58 adjacent to the second lubricant supply opening 74 (that is, when the pressure in the first pressure region is greater than the pressure in the second pressure region).
    [00032] As shown in Figures 1 and 2, valve housing 102 also defines a pilot inlet 146 in fluid communication with the compression chamber 58 through a pilot passage 150. An orifice or constraint 152 is positioned within the pilot passage 150 to limit the flow of fluid through passage 150. In some embodiments, orifice 152 may be omitted. Although the pilot passage 150 is schematically shown to be in fluid communication with the compression chamber 58 through the second lubricant feed opening 74, the pilot passage 150 is actually in fluid communication with the compression chamber 58 through a separate opening which is generally parallel to, but spaced from the second lubricant supply opening 74. That is, the separate opening is at the same relative distance from the suction opening 62 in the direction of increasing pressure P as the second lubricant supply opening 74 , but it is displaced transversely from the second lubricant supply opening 74. In some embodiments, the pilot input 146 communicates with the second lubricant supply opening 74. The pilot input 146 directs a signal pressure from the compression chamber 58 into the cavity 114. This signal pressure enters cavity 114 adjacent to the first end 154 of the spool 106 (on the right side of the spool 106 in Figures 1 and 2).
    [00033] The illustrated spool 106 includes an annular portion depressed 108 and a bleed hole 162 that extends from the depressed portion 158 to a central region of the spool 106. The depressed portion 158 allows the lubricant to flow into cavity 114 of the housing valve 102 through inlet 118. The recessed portion 158 also allows the lubricant to flow around the spool 106 to the outlets 122, 126 and the bleed hole 162. The bleed hole 162 directs the lubricant towards a second end 166 of the spool 106 (on the left side of the spool 106 in Figures 1 and 2.
    [00034] The port inlet 146 and the vent hole 162 thereby establish pressures at the first end 154 and the second end 166 of the spool 106, respectively. Pilot inlet 146 directs flow towards the right side of the spool 106 illustrated so that the pressure at the first end 154 of the spool 106 is generally equal to the pressure inside the compression chamber 58 adjacent to the second lubricant feed opening 74 (i.e. ie, the pressure in the second pressure region). The bleed hole 162 directs the fluid towards the left side of the spool 106 illustrated so that the pressure at the second end 166 of the spool 106 is generally equal to the pressure inside the lubricant reservoir 30 (i.e., the pressure in the first oil region). pressure). When the pressure at the first end 154 of the spool 106 exceeds the pressure at the second end 166 of the spool 106, the spool 106 moves or slides to the first position (Figure 1). When the pressure at the second end 166 of the spool 106 exceeds the pressure at the first end 154 of the spool 106, the spool 106 moves or slides to the second position (Figure 2).
    [00035] The tensioning member 110 is positioned inside the valve housing 102 and coupled to the spool 106 to tension the spool 106 to the first position (to the left in Figures 1 and 2). In the illustrated embodiment, the tensioning member 110 is a spiral spring. In other embodiments, other suitable tensioning members can also or alternatively be employed. The tension member 110 inhibits premature movement of the spool 106 to the second position (Figure 2) if the pressure inside the lubricant reservoir 30 is equal to or only slightly higher than the pressure inside the compression chamber 58. The member tensioning valve 110 also pre-positions valve 38 in the first position (Figure 1) at the start of the compression system 10.
    [00036] In operation, the motor 46 drives the axis 82 of the drive rotor 50 to rotate the drive rotor 50 and the idle rotor 54. The fluid (for example, the refrigerant) is directed from the evaporator 26 into the compression 58 of the screw compressor 34 through the suction opening 62 in the compressor housing 42. The fluid is compressed by the rotors 50, 54 and moved in the direction of the increasing pressure P from the suction opening 62 to the discharge opening 66, creating a progressively increased pressure inside the compression chamber 58. The fluid continues through the compression chamber 58 to the discharge opening 66. The discharge opening 66 directs the compressed fluid (eg refrigerant and lubricant) from the screw compressor 34 to the lubricant reservoir 30.
    [00037] When starting the compressor system 10, valve 38 is in the first position (Figure 1) to direct the lubricant (for example oil) from the lubricant reservoir 30 to the first lubricant feed opening 70. In this position a lubricant relatively low pressure is provided for a low pressure section of the compression chamber 58 to lubricate the rotors 50, 54. Such an arrangement makes it easier to supply the lubricant to the rotors 50, 54 when the pressure of the lubricant is less than the pressure within the chamber 58 in the second lubricant feed opening 74. Otherwise, the lubricant can be blown back through the second lubricant feed opening 74.
    [00038] As the screw compressor 34 continues to operate, the pressure of the fluid being discharged through the discharge opening 66 into the lubricant reservoir 30 increases, creating an increased pressure within the reservoir 30. When the pressure within the reservoir lubricant 30 is greater than the pressure inside the compression chamber 58 adjacent to the second lubricant feed opening 74 and the tensioning force of the tensioning member 110, the valve 38 moves to the second position (Figure 2) to direct the lubricant from the lubricant reservoir 30 to the second lubricant feed opening 74. In this position, a relatively high pressure lubricant is supplied to a higher pressure section of the compression chamber 58 to lubricate the rotors 50, 54. Such an arrangement increases the efficiency of the compressor system 10 by supplying the lubricant for the rotors 50, 54 in a location closer to the opening of scarga 66.
    [00039] In some operating conditions of the screw compressor 34, the rotors 50, 54 can overcompress the fluid inside the compression chamber 58 so that the pressure inside the chamber 58 is higher than the pressure of the fluid being discharged to reservoir 30. During such conditions, if valve 38 remained in the second position (Figure 2), the lubricant in reservoir 30 would be blown back through the second feed opening 74 and would not reach rotors 50, 54. However, the pilot inlet 146 directs the high pressure fluid from the compression chamber 58 into cavity 114 of valve 38 to move valve 38 back to the first position (Figure 1) during these conditions. The lubricant is then directed from the lubricant reservoir 30 to the rotors 50, 54 through the first lubricant feed opening 70, which is in a relatively lower pressure section of the compression chamber 58.
    [00040] Figures 5 and 6 illustrate another modality of a compressor system 210 for use with the cooling system 14. The compressor system 210 illustrated is similar to the compressor system 10 discussed above and the same parts were given the same numbers of reference. Reference is hereby made to the compressor system 10 of Figures 1-4 for discussion of characteristics and elements of the compressor system 210, as well as alternatives to the characteristics and elements, not specifically discussed below.
    [00041] In the illustrated embodiment, the compressor housing 42 defines a bearing feed opening 214. The bearing feed opening 214 is in fluid communication with the bearings 94 adjacent to the suction opening 62. Although not shown, in In some embodiments, the compressor housing 42 may also define a bearing feed opening in communication with the bearings 98 adjacent to the discharge opening 66.
    [00042] As shown in Figure 5, the bearing feed opening 214 is in fluid communication with valve 38 through a third lubricant feed passage 222 to supply lubricant to bearings 94 when valve 38 is in the first position . As shown in Figure 6, the bearing feed opening 214 is in fluid communication with valve 38 through a fourth lubricant feed passage 226 to supply lubricant to bearings 94 when valve 38 is in the second position. The lubricant feed passages 222, 226 communicate with the cavity 114 of the valve 38 through outlets that are generally parallel to, but spaced from the first outlet 122 and the second outlet 126, respectively.
    [00043] An orifice or restriction 230, 232 is positioned within each passage 222, 226 to limit the flow of lubricant through the passages 222, 226. The second orifice 232 has a smaller diameter than the first orifice 230 so that less lubricant is supplied for bearings 94 when valve 38 is in the second position than when valve 38 is in the first position. Such an arrangement increases the efficiency of the compressor system 10. During start-up, the bearings 94 are flooded with lubricant through the orifice 230 to ensure proper lubrication for the rotation of the rotors 50, 54. As the screw compressor 34 continues to operate, a lower volume of lubricant can be supplied to bearings 94 to maintain proper lubrication of bearings 94. The smaller diameter of second hole 232 directs less lubricant to bearings 94 than hole 230, thereby increasing the efficiency of the system 10 .
    [00044] Figures 7 and 8 illustrate another modality of a compressor system 310 for use with the cooling system 14. The compressor system 310 illustrated is similar to the compressor system 10 discussed above and the same parts were given the same numbers of reference. Reference is hereby made to the compressor system 10 of Figures 1-4 for discussion of characteristics and elements of the compressor system 310, as well as alternatives to the characteristics and elements, not specifically discussed below.
    [00045] Similar to the compressor system 10 discussed above, valve 38 in the illustrated compressor system 310 moves between a first position (Figure 7) and a second position (Figure 8) based on a difference in pressure between a first pressure region. pressure and a second pressure region. In the illustrated embodiment, the first pressure region includes the lubricant reservoir 30 and the second pressure region includes a portion of the compression chamber 58 downstream of the second lubricant supply opening 74. Pilot inlet 146 of valve 38 is in communication of fluid with the compression chamber 58 of the screw compressor 34 through an opening 314 located between the second lubricant feed opening 74 and the discharge opening 66. That is, the opening 314 is located farther along the filling chamber. compression 58 than the second lubricant feed opening 74 in the direction of increasing pressure P.
    [00046] The illustrated valve 38 does not include a tensioning member (for example, the tensioning member 110 shown in Figures 1 and 2) to tension the spool 106 to the first position (Figure 7). Instead, by positioning orifice 314 between the second lubricant feed opening 74 and the discharge opening 66, the spool 106 does not move to the second position (Figure 8) until the pressure inside the lubricant reservoir 30 is significantly greater than than the pressure inside the compression chamber 58 adjacent to the second feed opening 74. With such an arrangement, it is less likely that the lubricant will be blown back through the second feed opening 74 when valve 38 is in the second position. In some embodiments, valve 38 may also include a tensioning member or other element for pre-positioning the spool 106 in the first position.
    [00047] Although not shown, the illustrated compressor system 310 may also include a bearing feed opening similar to the bearing feed opening 214 shown in Figures 5 and 6 and discussed above.
    [00048] Figures 9 and 10 illustrate another modality of a compressor system 410 for use with the cooling system 14. The compressor system 410 illustrated is similar to the compressor system 10 discussed above and equal parts were given the same numbers of reference. Reference is hereby made to the compressor system 10 of Figures 1-4 for discussion of characteristics and elements of the compressor system 410, as well as alternatives to the characteristics and elements, not specifically discussed below.
    [00049] Similar to the compressor system 10 discussed above, valve 38 in the illustrated compressor system 410 moves between a first position (Figure 9) and a second position (Figure 10) based on a difference in pressure between a first pressure region. pressure and a second pressure region. In the illustrated embodiment, the first pressure region includes the lubricant reservoir 30 and the second pressure region includes the suction opening 62 of the compression chamber 58. With such an arrangement, the spool 106 moves to the first position (Figure 9) when the pressure in the suction opening 62 is greater than or equal to the pressure inside the lubricant reservoir 30. The spool 106 moves to the second position (Figure 10) when the pressure inside the lubricant reservoir 30 is greater than the pressure in the suction opening 62 and the strength of the tension member 110.
    [00050] Although not shown, the illustrated compressor system 410 may also include a bearing feed opening similar to the bearing feed opening 214 shown in Figures 5 and 6 and discussed above.
    [00051] Although the invention has been described in detail with reference to certain preferred embodiments, variations and modifications exist within the scope and spirit of one or more independent aspects of the invention. Several features of the invention are presented in the following claims.
    权利要求:
    Claims (15)
    [0001]
    1. Compressor system (10), comprising: a lubricant reservoir (30) adapted to contain a lubricant; a screw compressor (34), comprising a housing (42) defining a compression chamber (58) that has a suction opening (62), a discharge opening (66), a first lubricant supply opening ( 70) located between the suction opening (62) and the discharge opening (66), and a second lubricant supply opening (74) located between the discharge opening (66) and the first lubricant supply opening (70) ), a drive rotor (50) supported by the housing (42) and arranged inside the compression chamber (58), and an idle rotor (54) supported by the housing (42) and arranged inside the compression chamber (58), the idle rotor (54) driven by the drive rotor (50) to compress and move the fluid in an increasing pressure direction from the suction opening (62) to the discharge opening (66) creating pressure in a first pressure region ; and characterized by a valve (38) in fluid communication with the lubricant reservoir (30), the valve (38) movable between a first position and a second position based on the pressure in the first pressure region; wherein, in the first position, the valve (38) fluidly connects the lubricant reservoir (30) to a first lubricant feed passage (134) to direct the lubricant to the first lubricant feed opening (70) through the first lubricant feed passage (134), and in the second position, the valve (38) fluidly connects the lubricant reservoir (30) to a second lubricant feed passage (138) _to direct the lubricant to the second feed opening lubricant (74) through the second lubricant feed passage (138).
    [0002]
    2. Compressor system (10) according to claim 1, characterized by the fact that operating the screw compressor (34) increases the pressure in the first pressure region, and in which the increased pressure in the first pressure region moves the pressure. valve (38) from the first position to the second position.
    [0003]
    Compressor system (10) according to claim 2, characterized in that the valve (38) includes a tensioning member (110) to tension the valve (38) to the first position, and in which the pressure increased in the first pressure region overcomes the tensioning member (110) to move the valve (38) to the second position.
    [0004]
    Compressor system (10) according to claim 1, characterized in that the valve (38) includes a spool valve (106), and in which the pressure in the first pressure region mechanically acts on the spool valve (106) between the first position and the second position.
    [0005]
    Compressor system (10) according to claim 1, characterized by the fact that the idle rotor (54) is driven by the drive rotor (50) to also create pressure in a second pressure region that is spaced from the first pressure region, and where the valve (38) is moved between the first position and the second position based on a difference in pressure between the pressure in the first pressure region and the pressure in the second pressure region.
    [0006]
    Compressor system (10) according to claim 5, characterized in that the first pressure region includes the lubricant reservoir (30) and the second pressure region includes an adjacent compression chamber portion (58) the lubricant feed opening (74).
    [0007]
    Compressor system (10) according to claim 6, characterized in that the valve (38) is moved to the first position when the pressure in the compression chamber portion (58) is greater than the pressure in the lubricant reservoir (30), and the valve (38) is moved to the second position when the pressure in the lubricant reservoir (30) is greater than the pressure in the compression chamber portion (58).
    [0008]
    Compressor system (10) according to claim 5, characterized in that the first pressure region includes the lubricant reservoir (30) and the second pressure region includes a portion of the compression chamber (58) between the second lubricant feed opening (74) and the discharge opening (66), and optionally where the valve (38) is moved to the first position when the pressure in the compression chamber portion (58) is greater than the pressure in the lubricant reservoir (30), and the valve (38) is moved to the second position when the pressure in the lubricant reservoir (30) is greater than the pressure in the compression chamber portion (58).
    [0009]
    Compressor system (10) according to claim 5, characterized in that the first pressure region includes the lubricant reservoir (30) and the second pressure region includes the suction opening (62) of the pressure chamber compression (58), and optionally in which the valve (38) is moved to the first position when the pressure in the suction opening (62) is greater than the pressure in the lubricant reservoir (30), and in which valve (38 ) is moved to the second position when the pressure in the lubricant reservoir (30) is greater than the pressure in the suction opening (62).
    [0010]
    10. Compressor system (10) according to claim 1, characterized in that the screw compressor (34) includes a bearing (94) that supports one of the drive rotor (50) and the idle rotor (54) for rotation, where the housing (42) supports the bearing (94) and defines a bearing feed opening (214) in fluid communication with the valve (38) through a third lubricant feed passage (222), and where the valve (38) fluidly connects the lubricant reservoir (30) in the third lubricant feed passage (222) to direct the lubricant to the bearing feed opening (214), and optionally where, in the first position , the valve (38) fluidly connects the lubricant reservoir (30) in the third lubricant feed passage (222) to direct the lubricant to the bearing feed opening (214), and, in the second position, the valve (38 ) fluidly connects the reservoir lubricant (30) to a fourth lubricant feed passage (226) to direct the lubricant to the bearing feed opening (214), wherein the third lubricant feed passage (222) includes a first orifice (230) and the fourth lubricant feed passage (226) includes a second orifice (232), and the second orifice (232) has a smaller diameter than the first orifice (230) so that less lubricant is supplied to the bearing (94) when the valve (38) is in the second position than when the valve (38) is in the first position.
    [0011]
    11. Method for operating a compressor system (10), the compressor system (10) including a lubricant reservoir (30) adapted to contain a lubricant and a screw compressor (34), the screw compressor (34) comprising a housing (42) defining a compression chamber (58) having a suction opening (62), a discharge opening (66), a first lubricant supply opening (70) located between the suction opening (62 ) and the discharge opening (66), and a second lubricant supply opening (74) located between the discharge port (66) and the first lubricant supply opening (70), the method comprising: providing a valve ( 38) in fluid communication with the lubricant reservoir (30); compressing and moving the fluid in a direction of increasing pressure from the suction port (62) to the discharge port (66) creating pressure in a first pressure region; and characterized by moving the valve (38) between a first position and a second position based on the pressure in the first pressure region; fluidly connect the lubricant reservoir (30) to a first lubricant feed passage (134) when the valve (38) is in the first position to direct the lubricant to the first lubricant feed opening (70) of the screw compressor ( 34) through the first lubricant feed passage (134); and fluidly connect the lubricant reservoir (30) to a second lubricant supply passage (138) when the valve (38) is in the second position to direct the lubricant to the second lubricant supply opening (74) of the screw compressor (34) through the second lubricant feed passage (138).
    [0012]
    12. Method according to claim 11, characterized in that it further comprises increasing the pressure in the first pressure region to move the valve (38) from the first position to the second position, and optionally further comprising tensioning the valve (38) to the first position with a tensioning member (110), and where increasing the pressure in the first pressure region includes increasing the pressure in the first pressure region to overcome the tensioning member (110) and move the valve (38) of the first position to second position.
    [0013]
    13. Method according to claim 11, characterized in that providing the valve (38) includes a spool valve (106), and in which moving the valve (38) includes mechanically actuating the spool valve (106) between the first position and the second position based on the pressure in the first pressure region.
    [0014]
    14. Method according to claim 11, characterized in that it compresses and moves fluid in the direction of increasing the pressure from the suction opening (62) to the discharge opening (66) creating the pressure in the first region and a pressure in a second pressure region that is spaced from the first pressure region, and where moving the valve (38) includes moving the valve (38) between the first position and the second position based on the difference in pressure between the pressure in the first pressure region and pressure in the second pressure region.
    [0015]
    15. Method according to claim 11, characterized in that the screw compressor (34) includes a bearing (94), in which the housing (42) supports the bearing (94) and defines a bearing feed opening ( 214), where supplying the valve includes supplying the valve (38) in fluid communication with the bearing feed opening, through a third lubricant feed passage (222) and further comprises: fluidly connecting the lubricant reservoir (30) the third lubricant feed passage (222) to direct the lubricant to the bearing feed port (214), and optionally providing the valve (38) also includes providing the valve in fluid communication with the feed supply opening bearing (214) through a fourth lubricant feed passage (226), wherein the third lubricant feed passage (222) includes a first orifice (230) and the second feed passage d and lubricant (138) includes a second orifice (232), and further comprises: fluidly connecting the lubricant reservoir (30) to the fourth lubricant feed passage (226) when the valve (38) is in the second position to direct the lubricant for the feed opening of the bearing (214), where the second orifice (232) has a smaller diameter than the first orifice (230) such that less lubricant is supplied to the bearing (94) when the valve (38) is in the second position than when the valve (38) is in the first position.
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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]|
    2019-12-24| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-01-19| B09A| Decision: intention to grant|
    2021-03-30| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 08/02/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/024,356|2011-02-10|
    US13/024,356|US8454334B2|2011-02-10|2011-02-10|Lubricant control valve for a screw compressor|
    PCT/US2012/024241|WO2012109302A2|2011-02-10|2012-02-08|Lubricant control valve for a screw compressor|
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