• 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:
    Summary The invention relates to a pump wheel assembly and a pump for pumping liquid, comprising a pump chamber and a pump wheel (4) rotatable in said pump chamber which are supported in a lower end (5) of an axially extending drive shaft unit (6), which lower The drive shaft unit (6) is received in a cylindrical recess (10) in the impeller (4), the impeller (4) being displaceable back and forth in the axial direction in relation to said drive shaft unit (6) between a lower position and an upper position. Furthermore, the pump comprises a snap-fit conveyor arranged in the interface between the drive shaft unit (6) and the cylindrical recess (10), the snap-fit connector Or arranged to position the impeller (4) in the lower position dl a applied force acting to displace the impeller (4) in the direction away from the lower position Or less than one threshold value.
    公开号:SE1350957A1
    申请号:SE1350957
    申请日:2013-08-15
    公开日:2015-02-16
    发明作者:Patrik Andersson
    申请人:Xylem Ip Man S R L；
    IPC主号:
    专利说明:

    TECHNICAL FIELD OF THE INVENTION The present invention relates generally to a pump for pumping liquid, and in particular to a pump for pumping contaminated liquid containing solid material, such as sewage, sewage or sewage. plastic materials, hygiene items, textiles, rags, etc.
    According to a first aspect, the present invention relates to a pump comprising a pump chamber and a pump wheel rotatable in said pump chamber which is supported in a lower spirit by an axially extending drive shaft unit. The lower end of the drive shaft unit is received in a cylindrical recess in the impeller, the impeller Or being displaceable back and forth in the axial direction in relation to the said drive shaft unit between a lower position and an upper position.
    According to a second aspect, the present invention relates to an impeller assembly for placement in a pump chamber of a pump for pumping liquid.
    Background of the invention and the state of the art In plants such as sewage stations, septic tanks, wells, etc., solid materials or contaminants, such as socks, bandages, paper, etc., fall into the plant pump, for example a drinkable pump immersed in the plant basin . The hazards are sometimes too large to pass through the pump in cases where the impeller and impeller seat are located at a fixed distance from each other. In any case, large pieces of the solid material can cause the impeller to wedge and thus seriously damage the pump. Such an unintentional shutdown is costly, due to expensive, cumbersome, and unplanned maintenance work.
    In order to get rid of the solid material, it is possible to equip centrifugal pumps by means of cutting the solid material into smaller pieces and then removing the 2 smaller pieces together with the pumped liquid. However, the cutting of the solid material is energy intensive, which is negative especially since pumps of this type are usually in operation for long periods of time. Another conventional way of getting rid of the solid material is to any-arida an impeller having only one vane, which has a rigid through channel capable of letting solid material pass. A disadvantage of this type of pump is that the solid material often entangles itself around the leading edge of the blade / blade. A third attempt to solve the problem of large pieces of solid material leaking into the pump is to use an arrangement in which the impeller is arranged at a fixed distance from the impeller seat, for example 30-40 mm. A major disadvantage, however, is that the pump has a very limited efficiency at all times.
    From European patent EP 1,899,609, kdrit is a pump comprising a pump housing provided with a rotatable impeller, which is supported by a drive shaft, and an impeller seat. The impeller pulls movably in the axial direction in a farial direction to the impeller seat so that it can be able to slip through larger pieces of solid material which otherwise risk blocking the pump or wedging the impeller. The impeller has a cylindrical recess in which the lower end of the drive shaft unit is received, and the impeller is completely freely displaceable between a lower position and an additional position. According to this solution, the impeller has no well-defined rest position / basic position, but the lower position is assumed only due to the impeller weight, which makes it difficult to adjust the axial gap between the impeller and the impeller seat to fall within the preferred range 0.2-0.8 millimeter. The only basic position mentioned in the above-mentioned document is that the impeller can assume the correct position by means of a spring bias which overcomes the dead weight of the impeller to facilitate the start-up of the pump. However, it is extremely imprecise to adjust the axial gap when the impeller is in the off position. Some pre-sold products based on the above-mentioned European patents have used a helical spring arranged between the end surface of the drive shaft unit and a batten having the cylindrical recess of the impeller, in order to obtain a selected basic position / lower position to allow adjustment of the axial gap properly. This coil spring is relatively strong to obtain the selected resting layer, and the coil spring has the disadvantage that when the impeller is to be displaced in the axial direction relative to the drive shaft, the coil spring acts with increasing force in relation to increasing displacement distance, which is suitable for passing the solid material. .
    Furthermore, it should be mentioned that such submersible pumps are used to pump liquid frail wells which are difficult to maintain and the pumps are often in operation for long periods of time, not up to 12 hours per day or more. Therefore, it is extremely unfortunate to provide a pump with a long service life.
    Brief Description of the Objects of the Invention The present invention aims to obviate the above-mentioned disadvantages and shortcomings of prior art pumps and to provide an improved pump. A basic object of the invention is to provide an improved pump and impeller assembly of initially defined type, wherein the impeller has a selectable rest bore / lower position which means that adjustment of the axial gap between the impeller and the suction cap of the pump can be done with precision.
    A further object of the present invention is to provide a pump and impeller assembly, where displacement of the impeller away from the impeller seat during operation of the pump, in the absence of an axial force being applied, is not counteracted. It is also an object of the present invention to provide an improved pump of the initially defined type which reliably allows large pieces of solid material to pass through the pump.
    Brief description of the features of the invention According to the invention, at least the basic object is achieved by means of the initially defined pump and the impeller assembly, which have the features defined in the independent claims. Preferred embodiments of the present invention are further defined in the dependent claims.
    According to the present invention, there is provided a pump of initially defined type, which is characterized in that the pump comprises a snap-fit conveyor arranged in the interface between the drive shaft unit and the cylindrical recess, the snap-fit conveyor being arranged to position the impeller in the lower position Displace the impeller in the direction away from the lower position where less than one threshold value.
    Thus, the present invention is based on the insight that by using a sanding joint, a selected resting layer / base is obtained, for use in both operation of the pump and in mounting the pump and adjusting the axial gap.
    According to a preferred embodiment of the present invention, the snap-fit connection is arranged to disengage in the axial direction the impeller and the impeller is located at a distance from said lower position. This means that the snap-fit connection does not act with any force in the axial direction of the impeller when it is the same or is displaced away from the resting layer / lower position.
    According to a hazardous method of the present invention, a laser element has the snap-fit connection arranged in a laser element recess arranged in the cylindrical recess of the impeller, wherein the lead element is formed by a spring ring, and the laser element recess is formed by a groove. This means that the present invention requires four parts and that the suspension ring can also be used to secure the impeller on the drive shaft unit.
    In a further preferred embodiment, the spring ring has a varying radius along its circumference. This means that a smaller suspension ring can be used, which makes it possible to use a lower threshold value.
    According to a preferred embodiment of the present invention, the drive shaft unit comprises a drive shaft and a sleeve, which sleeve surrounds and is releasably connected to the drive shaft, the sleeve forming part of the lower end of the drive shaft unit. This means that the sleeve can be mounted in the cylindrical recess of the impeller, forming an impeller assembly, whereby the impeller assembly can be sold as a replacement kit for existing pumps with axially displaceable impeller.
    Further advantages and features of the invention will be apparent from the other independent claims and from the following detailed description of preferred embodiments.
    Brief Description of the Drawings A more complete understanding of the above and other features and advantages of the present invention will become apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings, in which: Fig. 1 is a schematic sectional side view of a hydraulic unit has an pump according to the invention, showing the impeller in the lower position, Fig. 2 is a schematic sectional side view of an impeller assembly according to the invention according to a preferred embodiment, where the impeller is bellows in the lower position, Fig. 3 shows a Fig. 4 is a schematic sectional side view of the impeller assembly according to Figure 2, in which the impeller is mounted in a position remote from the lower position; Fig. 4 is a schematic sectional side view of the drive shaft assembly according to a first embodiment; Fig. 5 is a schematic sectional side view of the drive shaft; the unit according to a second embodiment, Fig. 6 is a schematic genome the top view of the drive shaft unit according to Figure 4, taken along the line VI-VI, and a part of the impeller, Fig. 7 is an enlarged partial view of Figure 2, Fig. 8 is an enlarged partial view of Figure 2, showing a detail of the mounting connection according to Figure 2. a first embodiment, Fig. 9 is a partial view corresponding to Fig. 8 showing a detail of the snap-fit dressing according to a second embodiment, Fig. 10 is an enlarged partial view of Fig. 2, showing another detail of the sanding dressing according to the first embodiment, Figs. Fig. 11 is a partial view corresponding to Fig. 10 showing the detail of the sanding connection according to an alternative embodiment, Fig. 12 is a schematic perspective view of a lead element according to a first embodiment, Fig. 13 is a schematic sectional view from above of the drive shaft unit and the impeller according to Fig. 7. , taken along the line AA, comprising the laser element according to Fig. 12, Fig. 14 in a schematic sectional view from above of the drive shaft unit and the impeller according to Fig. 7, taken along the line BB, including Fig. 15 is a schematic perspective view of a laser element according to a second embodiment, Fig. 16 is a schematic sectional view from above of the drive shaft unit and the impeller according to Fig. 7, taken along the line AA, comprising the lasing element according to Fig. 15, Fig. 17 is a schematic sectional view from above of the drive shaft unit and the impeller according to Fig. 7, taken along the line BB, comprising the laser element according to Fig. 15, and Fig. 18 is a schematic perspective view from above of an impeller set.
    Detailed description of hazardous processes Reference is initially made to Figure 1, which shows a part of a pump according to the invention, more particularly the hydraulic unit of the pump, generally designated 1. Other parts of the pump have been removed for clarity when looking at the figure, and these parts include of a drive unit and one between the drive unit and the hydraulic unit 1 beldgen tatting unit. The present invention relates to pumps in general, but in the preferred embodiment the pump is a submersible centrifugal pump, the following description of the invention below being based on such a pump without being limited thereto.
    The hydraulic unit 1 comprises a pump housing or volume 2, which defines a pump chamber 3, a pump wheel 4 rotatable in said pump chamber 3, which is supported in a lower end 5 of an axially extending drive shaft unit, generally designated 6, and a suction cap 7, which has a central beldgen inlet opening 8 for incoming water flow. The suction cap 7, above the edge of the impeller set, is preferably releasably connected to the pump housing 2, for example by means of a plurality of bolts, in such a way that the suction cap 7 can not rotate relative to the pump housing 2. The impeller 4 is driven in rotation by the drive shaft unit 6. . Furthermore, the pump housing 2 comprises an outlet opening 9 for the outflow of liquid, which outlet opening 9 in the embodiment shown is radially directed.
    Central to the present invention is that the impeller 4 rotates forward and reciprocates in the axial direction relative to said drive shaft unit 6 between a lower position (shown in Figure 1) and an upper position. If the impeller 4 is displaced from the lower position, the impeller 4 is pushed forward in the direction away from the suction cap 7 in order to relax large pieces of solid material found in the pumped liquid.
    Reference is now made primarily to Figures 2 and 3, which show the impeller 4 according to the invention. In Figure 2, the impeller 4 is located in the lower position and in Figure 3, the impeller 4 is bellows in a position located at a distance from the lower position. If the impeller 4 is located in the upper position, as mentioned above, the impeller 4 may have been further displaced relative to the drive shaft unit 6 in the position shown in Figure 3. The impeller 4 comprises a cylindrical recess 10, the lower end 5 of the drive shaft unit 6 is received in said cylindrical recess 10.
    Reference is now made Above to Figures 4-6. In the exemplary embodiment according to Figure 4, the drive shaft unit 6 comprises a drive shaft 11 and a sleeve 12, the sleeve 12 surrounds and is releasably connected to the drive shaft 11. The sleeve 12 thus forms part of the lower end 5 of the drive shaft unit 6. The sleeve 12 is suitably connected to the drive shaft 11 In the embodiment shown, the sleeve 12 is connected to the drive shaft 11 by means of a conventional tool cone 13. The drive shaft 11 is cone-shaped and the tool cone 13 is pressed onto the drive shaft 11 by means of a bolt which is pulled in, the tool cone 13 is forced out radially and thus the sleeve 12 is fastened to the drive shaft 11. The advantage of this method is that the axial position of the shaft 12 between the sleeve and the drive shaft 11 can be adjusted 9 by loosening the bolt, displacing the sleeve 12 in the axial direction and again tightening the bolt. In the exemplary embodiment according to Figure 5, the drive shaft unit 6 consists of a homogeneous part which constitutes the lower end 5 of the drive shaft unit 6.
    According to a further embodiment, not shown, the sleeve 12 is screwed onto the end of a cylindrical, non-conical, drive shaft 11, and this design entails adjustment by arranging the desired number of spacers between the sleeve 12 and the drive shaft 11. However, it should be noted that this design works and it is experienced that the lower end 5 of the drive shaft unit 6 consists of a homogeneous part and that it is mounted.
    The drive shaft unit 6 and the impeller 4 are continuously rotatable and in the embodiment shown, see figure 6, the pump comprises a carrier in the form of a stay or pin 14, which is bellows in the interface between the lower end 5 of the drive shaft unit 6 and the cylindrical recess of the impeller 4. 10. The pin 14 is the bellows in opposite recesses arranged in the outer surface 5 of the drive shaft unit 6 of the drive shaft unit 6 and in the inner surface of the cylindrical recess 10, respectively. According to an alternative embodiment, a plurality of pins 14, or carriers, may be spaced along the said interface, preferably equidistantly distributed. The carrier can be fixedly connected to the lower end 5 of the drive shaft unit 6. In an alternative, not shown, embodiment there is a spline connection arranged in the said section. In a preferred embodiment, the lower end 5 of the drive shaft unit 6 has a lower, thicker part which in radial direction abuts the inner surface has the cylindrical recess 10, and an upper, narrower part which in radial direction is coated at a distance from the inner surface of the cylindrical recess. The lower thicker part steers the impeller 4 so that the same is not inclined in relation to the axis of rotation of the pump.
    In the upper part of the cylindrical recess 10 in the impeller 4 Or arranged an annular ring 15 which abuts against the lower end 5 of the drive shaft unit 6, alternatively against the drive shaft 11, and which prevents the pumped liquid and solid material from entering the cylindrical recess 10 from above.
    The impeller 4 is a so-called open impeller and comprises a nay 16 and an upper notch disc 17 and at least one blade 18, also known as a vane, which extends in the axial direction from the said impeller 17. Viewed in radial direction, the blade 18 is preferably helically shaped in opposite direction to the normal direction of rotation of the impeller 4, i.e. during normal operation of the pump. The number of blades 18 and the length of blades 18 can vary greatly, to suit different watering cans and applications. The cylindrical recess 10 is arranged in said nay 16. In the embodiment shown, at least one blade 18 is also connected to said nay 16, and in the dangerous embodiment the impeller 4 comprises two blades 18.
    Furthermore, the impeller 4 comprises a hall 19 in the hub 16, which hall 19 connects the cylindrical recess 10 to the pump chamber 3. An object of said hall 19 is to allow the insertion of a suitable tool for connecting the sleeve 12 to the drive shaft 11. Figure 3 shows a plug 20 which is inserted into the tail 19, in order to prevent the pumped liquid and solid material from entering the cylindrical recess 10 from below.
    Male reference is now made primarily to Figures 7-11. It is essential for the present invention that the pump comprises a snap-fit conveyor arranged in the interface between the drive shaft unit 6 and the cylindrical recess 10. The snap-fit connection Or is arranged to position the impeller 4 in the lower position in a applied force which acts to displace the impeller 4 in the direction away lower position Or less than one pre-determined threshold value.
    Preferably, the snap-fit connection is arranged to disengage in the axial direction the impeller 4 and the impeller 4 is located at a distance from the said lower position.
    In the embodiments shown, the snap-fit joint comprises a sate 21 arranged in the interface between the lower, 11 thicker part of the lower end 5 of the drive shaft unit 6 and the upper, narrower part of the lower end 5 of the drive shaft unit 6. The snap-fit joint sate 21 is delimited by a snap-fit shaft 22. Furthermore, a laser element 23 of the snap-fit connection is arranged in a laser element recess 24 arranged in the inner surface of the cylindrical recess 10 of the impeller 4. Preferably, the laser element 23 is formed by a spring ring and the laser element recess 24 is preferably formed by a circumferential groove.
    In Figures 7-8 and 10-11, the laser element 23 is formed by a spring ring, and the laser element recess 24 is formed by a groove. The spring ring 23 is arranged in the recess 24 and projects radially inwards into the cylindrical recess 10 of the impeller 4, whereupon the lower, thicker part of the lower end 5 of the drive shaft unit 6 is coated below the spring ring 23. This prevents the impeller 4 from falling off the drive shaft unit 6 as shown. Figures 10 and 11. Furthermore, at least a part of the spring ring 23 in engagement with the sate 21 of the snap-fit connection warps the impeller 4 is kept in its lower position. Ie. snap placement bead 22 Or the beldgen above the spring ring 23.
    In Figure 9, the laser element 23 is constituted by a ball shaft comprising a tube 25, a spring 26 and a ball 27. The tube 25 is arranged in the laser element recess 24 and projects radially in the cylindrical recess 10 of the impeller 4, thereby preventing the impeller 4 from falling off the drive shaft unit. 6 as shown in Figure 9. Ie. the lower, thicker part of the lower end of the drive shaft unit 6 Or coated below the tube 25. The ball 27 and the spring 26 Or arranged in the tube 25, warp the ball 27 Or spring bias in the direction of radial food and Or in engagement with the snap-fit joint sate 21 warp the impeller 4 in its lower position. Ie. the snap-fit bead 22 Or coated above the ball 27. In an alternative embodiment not shown Or the ball and the tube are replaced by an elongate laser element which Or is arranged in the laser element recess and which protrudes radially from the cylindrical recess of the impeller 12, thereby preventing the impeller from hitting the impeller. Ie. the lower, thicker part of the lower end 5 of the drive shaft unit 6 draws the bellows below the deflected laser element. The ball bearing element, like the ball 27 in Figure 9, springs spring-biased in a radially inward direction and engages with the snap-fit connection site 21 where the impeller 4 is retained in its lower position. The inner end of the elongate lasing element is preferably dangerous to facilitate interaction with the sanding bead 22.
    In the embodiment of Figure 10, the laser element recess 24 is wedge-shaped with a tapered shape in the direction radially outward. The wedge-shaped laser element recess 24 has an upper surface 28 which preferably extends horizontally, a lower surface 29 which slopes in relation to the lower surface, and a bottom surface which connects the said upper surface 28 and the said lower surface 29. The spring ring 23 is biased in a radially outward direction. warp parts thereof abut against the upper surface 28 and the lower surface 29 of the lead element recess 23, preferably without being in contact with the bottom surface 30. In this way the spring ring 23 is pressed against the upper surface 28 and thus a precise positioning of the spring ring 23 is obtained. in relation to the impeller 4.
    In the exemplary embodiment according to Figure 11, the laser element recess 24 comprises an upper surface which extends horizontally, a lower surface 29 which extends parallel to the upper surface 28 and a bottom surface 30 which connects said upper surface 28 and said lower surface 29. The spring ring 23 extends radially outwardly warped parts thereof abut against the bottom surface 30, and due to the dead weight of the impeller 4, the spring ring 23 also abuts against the upper surface 28, and thus a precise positioning of the spring ring 23 in relation to the impeller 4 is obtained.
    In an alternative embodiment not shown, the spring ring 23 abuts the upper surface 28 but where the bellows is spaced from the bottom surface 30, whereby the spring ring 23 can be allowed to expand in a radially extended direction as the snap-filling bead 13 22 passes the spring ring 23. In this embodiment the spring ring 23 may be a circular spring ring.
    Preferably, the spring ring 23 has a varying radius along its circumference, and has, for example, an oval, triangular or square basic shape when viewed in the axial direction. This means that certain sections of the spring ring 23 in contact with the seat 21 have the lower end 5 of the drive shaft unit 6 and other sections of the spring ring 23 in contact with the laser element recess 24 have the cylindrical recess 10 of the impeller 4.
    An increased understanding of the suspension ring 23 is obtained when looking at Figures 12-17, which show two examples of the design of the suspension ring 23. In Figures 12-14, the suspension ring 23 has an oval basic shape, with other ducks the suspension ring 23 having a smaller radius in two opposite directions (vertically in Figures 13 and 14) and larger radius in two other inboard opposite directions (horizontally in Figures 13 and 14). If the spring ring 23 thus has the smallest diameter, the spring ring 23 is in contact with the drive shaft 6 of the drive shaft unit 6, and when the spring ring 23 thus has the largest diameter, the spring ring 23 is in contact with the laser element socket 24 of the impeller 4. As shown in Figures 13 and 14, the spring ring 23 In Figures 15-17, the spring ring 23 has a square basic shape, in other words, the spring ring 23 has a smaller radius in four directions (diagonally in Figures 16 and 17) and a larger radius in four other directions (horizontally and vertically in Figures 16 and 17). The spring ring 23 thus has the smallest diameter in the spring ring 23 in contact with the drive shaft unit 6 seat 21, and where the spring ring 23 thus has the largest diameter in the spring ring 23 in contact with the impeller socket 24 of the impeller 4. As shown in Figures 16 and 17, the spring ring 23 retains the pin 14 .
    More correctly, the spring ring 23 should have a smaller radius in at least one direction and a larger radius in at least one other direction. Since the spring ring 23 has an oval and 14 square basic shape, there are two smaller radii opposite, and two larger radii opposite. In the design with triangular spring ring 23, a smaller radius is opposite an larger radius.
    The varying radius means that the spring ring 23 can be spring-biased both in the seat 21 as in the laser element recess 24 and clamed, a precise placement of the impeller 4 in its lower position without play in the axial direction is obtained. At the same time, a relatively small axially applied force is required to cause the sanding bead 22 to pass the spring ring 23.
    If a circular spring ring 23 is used, it cannot be spring biased in the laser element recess 24 and in that the spring ring 23 must have space to expand in a direction radially outwards as the filling bead 22 passes the spring ring 23.
    When a large piece of solid material forces the impeller 4 to leave the same lower position, no counteracting force acts after the sludge filling joint has come out of its engagement. After the solid material has passed, the impeller 4 assumes the same lower position due to the fact that there is a better hydraulic pressure on the top of the impeller 4 of the impeller An on the underside of the impeller 4, and in cases where the pump is oriented upright as shown in the figures. the gravity of the impeller 4 to return the impeller 4 to its lower position. Thus, when the impeller 4 has been displaced from its lower position, the spring ring 23 is still in the laser element recess 24, and when the impeller 4 returns to its lower position, the spring ring 23 is again positioned in the seat 21 of the drive shaft unit 6.
    Reference is now made to Figure 18, which shows an embodiment of a suction cap 7.
    In the upper surface of the suction lid 7 and the inlet 8 of the adjacent pump chamber 3, there is arranged at least one groove or groove 35 groove 31. The groove 31 extends from the inlet 8 of the suction lid 7 towards the periphery thereof. Preferably in a helical shape which sweeps outwards in the direction of rotation of the impeller 4, i.e. in the opposite direction to the has blades 18. The number of grooves 31 and their shape and orientation can vary starting to suit different watering cans and applications. The function of the spare 31 is to guide the solid material in the pumped liquid towards the periphery of the pump housing 2. As the solid material passes through the pump, a part will get stuck under the blades 18 of the impeller 4 and slow down the rotational speed of the impeller and even stop it. But the spar 31 helps to keep the blades 18 clean, by scraping off the solid material each time the blade 18 passes the same. If the solid material is to start fitting in the groove 31, between the impeller 4 and the suction cap 7, the impeller 4 will be pushed high away from the suction cap 7 by means of the solid material and thereby allow the solid material to pass through the pump.
    The lower edge of the mold ph blade 18 corresponds to the axial direction, the mold has the upper surface of the suction cap 7. The axial distance between said lower edge and said upper surface should be less than 1 mm in the impeller 4 hr in the lower position. Preferably, said distance is less than 0.8 mm and the aura is preferably less than 0.5 mm. At the same time, said distance should be more than 0.1 mm and preferably more than 0.2 mm. If the impeller 4 and the suction cap 7 are close together, a frictional force or a braking force acts on the blade 18 of the impeller 1.
    In order to ensure that the inlet 8 of the pump is not clogged, the suction cap 7 is preferably provided with means for guiding the solid material towards the groove 31. The guide means comprises at least one guide pin 32 extending from the upper surface of the suction cap 7, more precisely from that part of the the upper surface which is water towards the inlet 8. The guide pin 32 generally extends in the radial direction has the suction cap 7 and is coated under the impeller 4 and has an lower surface 33 which extends from a position adjacent the innermost part of the impeller blade 18 towards or to the upper surface of the suction cap 7. More specifically, the innermost portion of the upper surface 33 of the guide pin 16 32 is located at approximately the same radial distance from the center of the impeller 4 as the innermost portion of the blade 18 of the impeller 4. Preferably, the upper surface 33 of the guide pin 32 adjoins said "inlet" of said spout 31. The axial distance between the upper surface 33 of the guide pin 32 and the leading edge of the blade 18 should be less than 1 mm, cid the impeller 4 dr in the lower position.
    The present invention also relates to a impeller assembly for placement in a pump chamber 3. Such an impeller assembly can be sold as a coloring kit for a pump with axially displaceable impeller according to prior art. The impeller assembly comprises a impeller 4 with a cylindrical recess 10 and a sleeve 12. Sleeve 12 Or received in said cylindrical recess 10, the sleeve 12 Or being arranged to be connected to the axially extending drive shaft 11. The impeller 4 Or is arranged to be forward displaceable in the axial direction relative to said sleeve 12 between a lower position and an upper position. Furthermore, a snap-fit connection is arranged in the interface between the sleeve 12 and the cylindrical recess 10, the snap-fit connection Or being arranged to position the impeller 4 in the lower position in a piled force which acts to displace the impeller 4 in the direction away from the lower position. Or less On a threshold value. In addition (Jailer all that has been written above regarding the snap-fit connection, the sleeve 12 and the impeller 4. In this context, the sleeve 12 thus belongs to the impeller assembly, and when the impeller assembly Or is mounted on the drive shaft 11, the sleeve 12 belongs to the lower drive shaft unit 5 above.
    Conceivable modifications of the invention The invention is not limited only to the processes described above and shown in the drawings, which are for illustrative and exemplary purposes only. This patent application is intended to cover all adaptations and variants of the preferred embodiments described herein, and accordingly, when the present invention is defined by the wording of the appended claims, the equipment may be modified in any conceivable manner within the scope of the appended claims. .
    It should also be noted that all information about / moving terms such as above, below, byre, lower, etc., should be interpreted / loaded with the equipment oriented in accordance with the figures, with the drawings oriented in such a way that the reference designations can be loaded in a correct way. Suedes, such terms indicate only conditions were included in the embodiments shown, which conditions can be changed if the equipment according to the invention is provided with a different construction / design.
    It should be pointed out that even if it is not explicitly stated that features from a specific design can be combined with the features in another design, this should be considered as obvious as possible. 18
    权利要求:
    Claims (11)
    [1]
    A pump for pumping liquid, comprising a pump chamber and a pump wheel (4) rotatable in said pump chamber which is supported in a lower end (5) of an axially extending drive shaft unit (6), which lower end (5) has the drive shaft unit ( 6) is received in a cylindrical recess (10) in the impeller (4), the impeller (4) being reciprocated in the axial direction relative to said drive shaft unit (6) between a lower position and an upper position, drawn by, that the pump further comprises a snap-fit connection arranged in the interface between the drive shaft unit (6) and the cylindrical recess (10), the snap-fit connection being arranged to position the impeller (4) in the lower position as a applied force which acts to displace the impeller (4) in direction away from the lower position is less than a threshold value.
    [2]
    Pump according to claim 1, used in the snap-fit connection arranged to disengage in the axial direction the impeller (4) when the impeller (4) is bellows at a distance from said lower position.
    [3]
    A pump according to claim 1 or 2, used in the drive shaft unit (6) in the region of the lower end (5) thereof comprises a lower part which abuts radially against an inner surface having the cylindrical recess (10), and an upper part which in the radial direction the coatings are spaced from the inner surface of the cylindrical recess (10), a sate (21) having the snap-fit connection being arranged in the interface between said upper part and said lower part.
    [4]
    A pump according to claim 3, used in the sate (21) of the snap-fit connection is delimited by a snap-fit bead (22).
    [5]
    A pump according to any one of claims 1-4, used in a laser element (23) having the snap-fit connection arranged in a laser element recess (24) arranged in the cylindrical recess (10) of the impeller (4).
    [6]
    A pump according to claim 5, used in the laser element 5 of the snap-fit connection is constituted by a spring ring (23), and the laser element recess (24) is constituted by a groove.
    [7]
    A pump according to claim 6, vane in the spring ring (23) along its circumference has varying radius, viewed in axial direction.
    [8]
    A pump according to claim 7, used in the spring ring (23) having an oval, triangular or square basic shape, viewed in the axial direction.
    [9]
    A pump according to claim 5, used in the laser element (23) of the snap-fit connection consists of a ball shaft comprising a rEir (25), a spring (26) and a ball (27).
    [10]
    A pump according to any one of the preceding claims, comprising the drive shaft unit (6) comprising a drive shaft (11) and a sleeve (12), the sleeve (12) surrounding and releasably connected to the drive shaft (11), the sleeve (12) forming part of the lower end (5) of the drive shaft unit (6).
    [11]
    An impeller assembly for placement in a pump chamber, comprising a impeller (4) having a cylindrical recess (10) and a sleeve (12), said sleeve (12) being received in said cylindrical recess (10), the sleeve (12) being arranged to be connected to an axially extending drive shaft (11), and wherein the impeller (4) is displaceable back and forth in the axial direction relative to said sleeve (12) between a lower position and an upper position, characterized in that a snap-fitting connection Or arranged in the interface between the sleeve (12) and the cylindrical recess (10), the snap-fitting connection being arranged to position the impeller (4) in the lower position cid a applied force which acts to displace the impeller (4) away from it in the direction the lower position is less than a threshold value. 1/8 2/8 3/8 VI
    类似技术:
    公开号 | 公开日 | 专利标题
    SE1350958A1|2015-02-16|Pump for pumping fluid and impeller assembly
    SE527964C2|2006-07-25|Pump is for pumping contaminated liquid including solid material and incorporates pump housing with rotatable pump wheel suspended on drive shaft, with at least one blade and pump wheel seat
    CA2610567C|2013-11-05|A pump
    KR102345930B1|2021-12-31|Pump and impeller assemblies for pumping liquids
    SE531147C2|2009-01-07|Submersible centrifugal pump with normal and exhaust operating conditions
    CA1244721A|1988-11-15|Grinder pump
    KR19990044907A|1999-06-25|Pump impeller
    SE1350957A1|2015-02-16|Pump for pumping fluid and impeller assembly
    SE535741C2|2012-12-04|Method and apparatus for supplying gas, or a mixture of gases, to a fluid
    RU2538583C2|2015-01-10|Centrifugal separator
    EP1331401A2|2003-07-30|Impeller assembly for centrifugal pump
    KR20170101563A|2017-09-06|Submerged motor pump having variable type insertring
    CZ18661U1|2008-06-09|Cutting ring of mud pump cutting apparatus
    同族专利:
    公开号 | 公开日
    SE537330C2|2015-04-07|
    WO2015022648A1|2015-02-19|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    SE527964C2|2005-07-01|2006-07-25|Itt Mfg Enterprises Inc|Pump is for pumping contaminated liquid including solid material and incorporates pump housing with rotatable pump wheel suspended on drive shaft, with at least one blade and pump wheel seat|
    SE531147C2|2007-05-15|2009-01-07|Itt Mfg Enterprises Inc|Submersible centrifugal pump with normal and exhaust operating conditions|
    DE102009047446A1|2009-12-03|2011-06-09|Hanning Elektro-Werke Gmbh & Co. Kg|Pump, particularly evacuation pump, for liquid-bearing domestic appliances, has pump housing, in which impeller is supported around rotation axis under rotary connection of hub with shaft of electric motor|
    WO2012069055A1|2010-11-28|2012-05-31|Soerensen Harry H|Pump for pumping liquid containing solid matter|RU2641411C1|2016-08-30|2018-01-17|Акционерное общество Инжиниринговая компания "АСЭ"|Device for pump impeller fairing fastening|
    法律状态:
    2017-03-28| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1350957A|SE537330C2|2013-08-15|2013-08-15|Pump for pumping fluid and impeller assembly|SE1350957A| SE537330C2|2013-08-15|2013-08-15|Pump for pumping fluid and impeller assembly|
    PCT/IB2014/063891| WO2015022648A1|2013-08-15|2014-08-13|A pump for pumping liquid as well as an impeller assembly|
    [返回顶部]