Water pump

Abstract

The utility model provides a water pump which comprises a shaft sleeve, an expansion part, a return part, a relatively static limiting part and a rotating disc, the shaft sleeve is relatively fixed on the inner side of a rotor, the shaft sleeve rotates relative to a main shaft, and the shaft sleeve is arranged to be capable of expanding, deforming and returning in the radial direction; a guide rail spirally extending outwards from the center is arranged on one side, facing the main shaft, of the turntable; the expansion part and the guide rail are in sliding fit and do relative spiral motion, the expansion part and the limiting part are in sliding fit and do relative radial motion, and the expansion part is guided by the guide rail and the limiting part to the position where the shaft sleeve is expanded and deformed and the position where the shaft sleeve is separated; the restoring component acts on the main shaft to provide restoring force for the main shaft. According to the utility model, automatic release of adhesion between the main shaft and the rotor of the water pump is realized, and meanwhile, automatic recovery is realized to deal with next adhesion.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, and particularly relates to a water pump. Background Art

[0002] At present, DC brushless water pumps are widely used in gas water heaters. Compared with traditional AC water pumps, DC brushless water pumps are smaller in size, longer in service life, lower in noise, and can adjust the rotation speed and signal feedback. A water pump generally includes a rotor and a main shaft. The main shaft does not rotate during operation, and the rotor rotates around the main shaft. However, since the gap between the rotor and the main shaft is very small, fine sediment or other impurities will adhere to the gap between the rotor and the main shaft after entering the pump body. If the water pump does not operate for a long time, these impurities may become sticky after being soaked in water for a long time, sticking the main shaft and the rotor together. If the starting torque of the water pump cannot enable the rotor to break free from the adhesion force, the water pump cannot start and will be stuck.

[0003] Some existing technologies attempt to solve the adhesion problem manually. For example, CN218151448U provides a shaft support and a shaft bracket. The shaft support and the shaft bracket are respectively located at both ends of the main shaft. The shaft bracket has an accommodation cavity inside for the axial movement of the main shaft. The shaft support is threadedly connected to the main shaft and allows the axial movement of the main shaft. The rotor is sleeved on the main shaft and can rotate around the main shaft. An opening is provided at the bottom of the water pump. When the water pump is stuck, the staff can apply force to the shaft support from the opening to rotate the shaft support, thereby driving the main shaft to generate axial displacement to separate the main shaft from the rotor. However, it cannot automatically solve the stuck problem, nor can it automatically solve the stuck problem repeatedly in a cycle. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the defect that the existing water pump cannot automatically solve the stuck problem repeatedly in a cycle, and provide a water pump.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A water pump includes a rotor and a main shaft. The rotor rotates around the main shaft. The main shaft is rotatably arranged. The water pump further includes a shaft sleeve, an expansion member, a return member, a relatively stationary limiting member, and a turntable. Among them,

[0007] The shaft sleeve is relatively fixed inside the rotor and rotates relative to the main shaft. The shaft sleeve is configured to be radially expandable and deformable and retractable.

[0008] The turntable cooperates with the main shaft and rotates together. A guide rail spirally extending from the center to the outside is provided on one side of the turntable facing the main shaft.

[0009] The expansion member and the guide rail are arranged to be in sliding fit and relatively spiral movement, the expansion member and the limiting member are arranged to be in sliding fit and relatively radial movement, and the expansion member is guided by the guide rail and the limiting member to the position where the bushing is expanded and deformed and the position where it disengages from the bushing;

[0010] The restoring member acts on the main shaft to provide the main shaft with a restoring force.

[0011] In this solution, the main shaft is fixed under normal conditions of the water pump, and the rotor and the bushing rotate together around the main shaft. When the main shaft and the bushing are abnormally adhered together, the rotation of the rotor can drive the bushing and the main shaft to rotate together. The main shaft drives the turntable to rotate, and at the same time enables the turntable to transmit motion to the expansion member. When the expansion member moves under the guidance of the guiding member and contacts the bushing, due to rotational inertia, the expansion member continues to expand the bushing outwards. The adhesion force between the main shaft and the bushing is destroyed, and the two are separated, releasing the stuck state of adhesion. The turntable compresses the restoring member while rotating. After the main shaft and the bushing are separated, the rotor cannot apply a rotational force to the turntable, and the restoring member drives the main shaft and the turntable to rotate in the reverse direction to return to the initial state. The expansion member moves in the reverse direction to reset. After the bushing loses the expansion force of the expansion member, it resets and contracts to the state before expansion. Thus, the automatic release of the adhesion between the main shaft and the rotor of the water pump is achieved, and the recoverable bushing and the expansion member can also cope with the occurrence of the next adhesion to achieve repeated use.

[0012] Preferably, one end of the bushing close to the expansion part is formed with a slit, and at least two opening and closing parts are formed through the slit, and the distance between the opening and closing parts can be expanded and deformed and restored radially. The opening and closing parts formed by the slit have more elasticity to facilitate expansion.

[0013] Preferably, a support snap ring is connected to the side of the opening and closing part facing the rotor. The support snap ring can provide an inward contraction force to the opening and closing part to facilitate the contraction of the opening and closing part.

[0014] Preferably, the expansion member has an axially extending axial end, and the axial end extends into the inner side of the opening and closing part. The axial end can increase the contact area with the opening and closing part, so as to more stably expand the opening and closing part.

[0015] Preferably, the expansion member is provided with a plurality of tooth parts, and the plurality of tooth parts are engaged with a plurality of grooves along the radial direction of the guide rail. The cooperation of the plurality of tooth parts and the grooves can increase the transmission stability of the expansion member, so that the expansion member is not easy to shake during the movement.

[0016] Preferably, the limiting member covers the side of the turntable facing the main shaft and encloses the space above and on the side of the guide rail. This can separate the guide rail from the outside world, preventing sundries from entering the guide rail and affecting the movement of the expansion member. At the same time, the limiting member also makes full use of the space, making the internal structure more compact.

[0017] Preferably, the limiting member forms a sliding groove in the radial direction, and the cross-section of the sliding groove has a varying dimension in the axial direction. The expansion member is in sliding fit with the sliding groove, and the outer wall surface of the expansion member has a shape adapted to the sliding groove. Thus, the sliding groove can limit the expansion member axially and prevent the expansion member from detaching from the turntable.

[0018] Preferably, a return support is further included on the side of the turntable away from the main shaft, and the return support is connected to the return member. The return support can act on the main shaft more evenly.

[0019] Preferably, the number of the expansion members is multiple, and the multiple expansion members are evenly distributed around the axis. The evenly distributed expansion members can provide more uniform extrusion, making the bushing deform more evenly.

[0020] Preferably, the water pump further includes a shaft support, and one end of the main shaft away from the expansion member is limited in the shaft support. The shaft support supports the main shaft on the one hand and allows the main shaft to rotate relative to it on the other hand.

[0021] The positive and progressive effects of the present utility model are as follows: The automatic release of the adhesion between the main shaft and the rotor of the water pump is realized, and at the same time, it automatically returns to cope with the occurrence of the next adhesion. Description of the Drawings

[0022] Figure 1 It is a schematic cross-sectional view of the water pump according to the preferred embodiment of the present utility model.

[0023] Figure 2 It is Figure 1 The enlarged view of part A in

[0024] Figure 3 It is Figure 1 The enlarged view of part B in

[0025] Figure 4 It is a schematic view of the cooperation between the expansion member and the bushing according to the preferred embodiment of the present utility model.

[0026] Figure 5 It is a schematic view of the cooperation between the expansion member and the turntable according to the preferred embodiment of the present utility model.

[0027] Figure 6 It is a schematic view of the cooperation between the expansion member and the limiting member according to the preferred embodiment of the present utility model.

[0028] Figure 7 Explosion schematic diagram of the internal structure of the water pump according to a preferred embodiment of the present utility model.

[0029] Figure 8 Schematic diagram of the structure of the shaft sleeve and the main shaft according to a preferred embodiment of the present utility model.

[0030] Description of reference numerals

[0031] Main shaft 100

[0032] Rotor 200

[0033] Shaft sleeve 300

[0034] Support circlip 310

[0035] Slit 320

[0036] Opening and closing part 330

[0037] Turntable 400

[0038] Guide rail 410

[0039] Return support 420

[0040] Limit member 500

[0041] Sliding groove 510

[0042] Expansion member 600

[0043] Axial end 610

[0044] Return member 700

[0045] Shaft support 810

[0046] Housing 820 Detailed implementation manners

[0047] Next, a preferred embodiment is given and the present utility model will be described more clearly and completely in conjunction with the accompanying drawings.

[0048] As Figures 1 - 8 shown, this embodiment discloses a water pump. In this embodiment, the axial direction refers to the direction parallel to or coinciding with the axis of the main shaft 100, and the radial direction refers to the direction parallel to or coinciding with the radial direction of the main shaft 100. Among them, as Figures 1 - 8As shown, the water pump of this embodiment includes a sleeve 300, an expansion component 600, a return component 700, a relatively stationary limit component 500 and a turntable 400, wherein the sleeve 300 is relatively fixed to the inner side of the rotor 200, and the sleeve 300 rotates relative to the main shaft 100, and the sleeve 300 is arranged to be expandable, deformable and restorable in the radial direction; the turntable 400 cooperates with the main shaft 100 and rotates together, and a guide rail 410 extending spirally from the center to the outside is arranged on the side of the turntable 400 facing the main shaft 100; the expansion component 600 and the guide rail 410 are arranged to be slidably matched and to move spirally relative to each other, the expansion component 600 and the limit component 500 are arranged to be slidably matched and to move radially relative to each other, and the expansion component 600 is guided by the guide rail 410 and the limit component 500 to a position where the sleeve 300 is expanded and deformed and to a position where it is separated from the sleeve 300; the return component 700 acts on the main shaft 100 to provide the main shaft 100 with a restoring force.

[0049] The restoring member 700 in this embodiment may be a coil spring or other member with elastic restoring function, and the restoring member 700 may directly contact the main shaft 100 for restoring, or may indirectly act on the main shaft 100 through other members. The relatively stationary limiting member 500 means that the limiting member 500 remains stationary relative to other moving members of the water pump.

[0050] In this solution, the main shaft 100 is fixed in the normal state of the water pump, and the rotor 200 and the sleeve 300 rotate together around the main shaft 100. When the main shaft 100 and the sleeve 300 are abnormally adhered together, the rotation of the rotor 200 can drive the sleeve 300 and the main shaft 100 to rotate together. The main shaft 100 drives the turntable 400 to rotate, and at the same time, the turntable 400 transmits motion to the expansion component 600. When the expansion component 600 moves and contacts the sleeve 300 under the guidance of the guide component, due to the rotational inertia, the expansion component 600 continues to expand the sleeve 300 outward. The adhesion between the main shaft 100 and the sleeve 300 is destroyed, and the two are separated, and the adhesion and stuck state is released. While the turntable 400 rotates, the return component 700 is compressed. When the main shaft 100 and the sleeve 300 are separated, the rotor 200 cannot give the turntable 400 a force to rotate, and the return component 700 drives the main shaft 100 and the turntable 400 to rotate in the opposite direction to restore to the initial state. The expansion member 600 moves in the reverse direction to reset, and the sleeve 300 is reset and contracted to the state before expansion after the expansion force of the expansion member 600 is gone. In this way, the water pump can automatically release the adhesion between the main shaft 100 and the rotor 200, and the sleeve 300 and the expansion member 600 can also be restored to cope with the next adhesion, so as to achieve repeated use.

[0051] like Figure 2As shown, in a preferred embodiment, the water pump further includes a shaft bracket 810, and one end of the main shaft 100 away from the expansion member 600 is limited in the shaft bracket 810. The shaft bracket 810 supports the main shaft 100 on one hand and allows the main shaft 100 to rotate relative to it on the other hand. In other embodiments, other structures may also support and limit the main shaft 100. As Figure 3 shown, the housing 820 can be a structure in a known water pump or other structures isolated from the lower space.

[0052] As Figure 3 and Figure 4 shown, in a preferred embodiment, on the side of the turntable 400 away from the main shaft 100, there is further a return support 420, and the return support 420 is connected to the return member 700. The return support 420 can act on the main shaft 100 more evenly.

[0053] As Figure 4 and Figure 5 shown, in a preferred embodiment, the expansion member 600 has an axially extending axial end 610, and the axial end 610 extends into the inner side of the opening and closing portion 330. The axial end 610 can increase the contact area with the opening and closing portion 330, so as to more stably expand the opening and closing portion 330.

[0054] As Figure 4 and Figure 5 shown, in a preferred embodiment, the expansion member 600 is provided with a plurality of tooth portions, and the plurality of tooth portions are engaged with a plurality of grooves along the radial direction of the guide rail 410. The cooperation of the plurality of tooth portions and the grooves can increase the transmission stability of the expansion member 600, so that the expansion member 600 is not prone to shaking during the movement.

[0055] As Figure 6 shown, in a preferred embodiment, the limiting member 500 covers the side of the turntable 400 facing the main shaft 100 and surrounds the space above and on the side of the guide rail 410. Thus, the guide rail 410 can be separated from the outside, avoiding sundries from entering the guide rail 410 and affecting the movement of the expansion member 600. At the same time, the limiting member 500 also makes full use of the space, making the internal structure more compact.

[0056] As Figure 6 and Figure 7 shown, in a preferred embodiment, the limiting member 500 forms a sliding groove 510 in the radial direction, and the cross section of the sliding groove 510 has a varying dimension in the axial direction. The expansion member 600 is in sliding fit with the sliding groove 510, and the outer wall surface of the expansion member 600 has a shape adapted to the sliding groove 510. Thus, the sliding groove 510 can limit the expansion member 600 axially and prevent the expansion member 600 from disengaging from the turntable 400.

[0057] AsFigure 6 and Figure 7 As shown, in a preferred embodiment, the number of expansion members 600 is multiple, and the multiple expansion members 600 are evenly distributed around the axial direction. The evenly distributed expansion members 600 can provide more uniform extrusion, making the bushing 300 deform more evenly.

[0058] As Figure 8 shown, in a preferred embodiment, a slit 320 is formed at one end of the bushing 300 close to the expansion member 600, and at least two opening and closing portions 330 are formed through the slit 320. The distance between the opening and closing portions 330 can be expanded and deformed and restored radially. The opening and closing portions 330 formed through the slit 320 have more elasticity to facilitate expansion. In other embodiments, it can also be other variable forms, such as elastic deformation of the material of the bushing 300 itself, or elastic deformation achieved through an elastic structure formed by other means.

[0059] As Figure 8 shown, in a further preferred embodiment, a support snap ring 310 is connected to the side of the opening and closing portion 330 facing the rotor 200. The support snap ring 310 can provide an inward contraction force to the opening and closing portion 330, facilitating the fixation of the bushing 300 and providing a force for the bushing to return to its original state after expansion. In other alternative ways, the support snap ring 310 may not be provided, and its own elastic recovery may be utilized, or other structures connected to the opening and closing portion 330 or the reset structure on the rotor 200 and the main shaft 100 may help the opening and closing portion 330 to recover.

[0060] As Figure 1 and Figure 8 shown, in a preferred embodiment, one end of the bushing 300 is a closed ring, and the other end is an openable end, including an openable opening and closing portion 330, which can make one end of the bushing 300 expand or contract back. The cavity in the rotor 200 for accommodating the bushing 300 is a frustum-shaped structure, and the large head of the frustum is matched with the openable end of the bushing 300 to facilitate the expansion of the bushing 300. When the water pump is running normally, the rotor 200 and the bushing 300 are regarded as a whole and rotate around the main shaft 100.

[0061] As Figure 8 shown, in a preferred embodiment, the lower end of the main shaft 100 is a hexagonal limit shape, which is adapted to the shape of the hole in the turntable 400. This prevents relative rotation between the main shaft 100 and the turntable 400. In other embodiments, other fixing methods can also be adopted.

[0062] The water pump of this embodiment can be applied to relevant water pumps in water heaters, or can also be used in water pumps with similar spindle and rotor structures in other fields. The present utility model realizes the automatic release of the adhesion between the spindle 100 and the rotor 200 of the water pump, and at the same time automatically returns to cope with the occurrence of the next adhesion.

[0063] Although the specific implementation manners of the present utility model have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present utility model is defined by the appended claims. Without departing from the principle and essence of the present utility model, those skilled in the art can make various changes or modifications to these implementation manners, but these changes and modifications all fall within the protection scope of the present utility model.

Claims

1. A water pump, comprising a rotor and a main shaft, wherein the rotor rotates around the main shaft, and is characterized in that, The main shaft is rotatably arranged. The water pump further includes a shaft sleeve, an expansion member, a restoring member, a relatively stationary limiting member, and a turntable. Among them, The shaft sleeve is relatively fixed to the inner side of the rotor, and the shaft sleeve rotates relative to the main shaft. The shaft sleeve is arranged to be expandable and deformable and restorable in the radial direction; The turntable is engaged with the main shaft and rotates together with it. A guide rail extending spirally outward from the center is provided on the side of the turntable facing the main shaft; The expansion member and the guide rail are arranged to be in sliding fit and move relatively spirally. The expansion member and the limiting member are arranged to be in sliding fit and move relatively radially. The expansion member is guided by the guide rail and the limiting member to the position where the shaft sleeve is expanded and deformed and the position where it disengages from the shaft sleeve; The restoring member acts on the main shaft to provide a restoring force to the main shaft.

2. The water pump according to claim 1, characterized in that, One end of the shaft sleeve close to the expansion part is formed with a slit, and at least two opening and closing parts are formed through the slit. The distance between the opening and closing parts is expandable and deformable and restorable in the radial direction.

3. The water pump according to claim 2, characterized in that, A support circlip is connected to the side of the opening and closing part facing the rotor.

4. The water pump according to claim 2, wherein The expansion member has an axially extending axial end, and the axial end extends into the inner side of the opening and closing part.

5. The water pump according to claim 1, characterized in that, The expansion member is provided with a plurality of tooth parts, and the plurality of tooth parts are engaged with a plurality of grooves along the radial direction of the guide rail.

6. The water pump according to claim 1, characterized in that, The limiting member covers the side of the turntable facing the main shaft and encloses the space above and on the side of the guide rail.

7. The water pump according to claim 1, characterized in that, The limiting member forms a sliding groove in the radial direction, and the cross section of the sliding groove has a varying dimension in the axial direction. The expansion member is in sliding fit with the sliding groove, and the outer wall surface of the expansion member has a shape adapted to the sliding groove.

8. The water pump according to claim 1, wherein On the side of the turntable away from the main shaft, there is also a restoring support, and the restoring support is connected to the restoring member.

9. The water pump according to claim 1, characterized in that, The number of the expansion members is multiple, and the multiple expansion members are evenly distributed around the axis.

10. The water pump according to any one of claims 1-9, characterized in that, The water pump further includes a shaft support, and one end of the main shaft away from the expansion member is limited in the shaft support.

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