Water pump

Abstract

The utility model provides a water pump which comprises a return part, a shaft sleeve, a gear assembly, a relatively static guide part and an expansion part, the gear assembly comprises a first gear part and a second gear part which are in direct or indirect transmission, and the shaft sleeve is relatively fixed on the inner side of a rotor and rotates relative to a main shaft. The shaft sleeve can expand, deform and restore in the radial direction; the first gear part and the main shaft are matched and rotate together; the second gear part is matched with the expansion part, limits relative movement around the axial direction, and does not limit relative movement in the axial direction; the guide part is arranged to guide the expansion part to the position where the shaft sleeve is expanded and deformed in the axial direction and guide the expansion part to the position where the shaft sleeve is disengaged in the axial direction. The return member directly or indirectly applies a return force to the expansion member. 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 run 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. If the starting torque of the water pump cannot enable the rotor to break free from the adhesion force, the water pump cannot start, resulting in jamming.

[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 for the axial movement of the main shaft. The shaft support and the main shaft are set as a threaded connection and allow 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 jammed, 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 realize the separation of the main shaft and the rotor. However, it is impossible to automatically solve the jamming problem, and it is also impossible to automatically solve the jamming 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 pumps cannot automatically solve the jamming problem repeatedly in a cycle, and provide a water pump.

[0005] The utility model solves the above technical problem 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 restoring member, a shaft sleeve, a gear assembly, a guiding member and an expanding member that are relatively stationary. The gear assembly includes a first gear member and a second gear member that are directly or indirectly driven. Among them,

[0007] The shaft sleeve is relatively fixed to the inner side of the rotor and rotates relative to the main shaft. The shaft sleeve is configured to be radially expandable and deformable and recoverable.

[0008] The first gear component is fitted with the main shaft and rotates therewith; the second gear component is fitted with the expansion component and is axially restricted from relative movement therebetween, but not restricted from relative movement along the axial direction.

[0009] The guiding component is arranged to guide the expansion component axially to a position where the shaft sleeve is expanded and deformed, and to guide the expansion component axially away from the shaft sleeve.

[0010] The restoring component is compressed during the movement of the expansion component towards the shaft sleeve, and directly or indirectly applies a restoring force to the expansion component.

[0011] In this solution, the main shaft is fixed under normal conditions of the water pump, and the rotor and the shaft sleeve rotate together around the main shaft. When the main shaft and the shaft sleeve are abnormally adhered together, the rotation of the rotor can drive the shaft sleeve and the main shaft to rotate together. The main shaft drives the first gear component and the second gear component to rotate, thereby driving the expansion component to rotate synchronously. The expansion component moves towards the shaft sleeve under the guidance of the guiding component. When it moves to a position close to the shaft sleeve, such as the lower edge, while the expansion component rotates, it expands the shaft sleeve outwards away from the main shaft. The adhesion force between the shaft sleeve and the main shaft is destroyed, and the two are separated, releasing the adhesion and jamming state. After the shaft sleeve is separated, the rotor can no longer transmit the rotational force to the expansion component through the main shaft. The restoring component starts to release the restoring force and drives the expansion component to move back to the initial state. The shaft sleeve resets and contracts to the state before expansion, thereby realizing the automatic release of the adhesion between the main shaft and the rotor of the water pump. The recoverable shaft sleeve and the expansion component can also cope with the occurrence of the next adhesion to achieve repeated use.

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

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

[0014] Preferably, one side of the expansion component facing the shaft sleeve has an expansion shape, the radial dimension of the expansion shape changes around the axial direction, one side of the opening and closing portion facing the guiding component has an extension portion, and the extension portion contacts the expansion shape and expands as the radial dimension of the expansion shape increases. Through the cooperation of the expansion shape and the extension portion, the rotational force can be more effectively converted into the expansion of the opening and closing portion.

[0015] Preferably, the gear assembly further includes a planetary gear, which surrounds and meshes with the first gear component. A meshing portion of the second gear component surrounds the planetary gear and the first gear component on the outside and meshes with the planetary gear. A driving portion of the second gear component is sleeved around the periphery of the main shaft and cooperates with the expansion component. In this way, the main shaft, the first gear component, the planetary gear, and the second gear component can be stacked in the radial direction, saving axial space.

[0016] Preferably, the driving portion includes a limiting groove extending along the axial direction, and the expansion component has a limiting block cooperating with the limiting groove. The limiting groove and the limiting block guide the sliding of the expansion component, with a simple structure and strong movement reliability of the expansion component.

[0017] Preferably, a part of the guiding component is sleeved around the periphery of the meshing portion, and a guiding portion of the guiding component is sleeved around the periphery of the main shaft and cooperates with the expansion component. In this way, the guiding component, the main shaft, the first gear component, the planetary gear, and the second gear component can be stacked in the radial direction, saving axial space.

[0018] Preferably, the expansion component is annular. The inner ring side of the expansion component cooperates with the driving portion, and the outer ring side of the expansion component cooperates with the guiding portion. In this way, the expansion component is located between the guiding component and the second gear component in the radial direction, saving axial space.

[0019] Preferably, the guiding portion includes a spiral guide rail, and the expansion component has a slider cooperating with the spiral guide rail. The spiral guide rail facilitates guiding the expansion component to move axially while rotating.

[0020] Preferably, the water pump further includes a shaft bracket, and one end of the main shaft away from the expansion component is limited in the shaft bracket. The shaft bracket 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 a preferred embodiment of the present utility model.

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

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

[0025] Figure 4 An exploded view of the internal structure of a preferred embodiment of the present utility model.

[0026] Figure 5 Another exploded view of the internal structure of a preferred embodiment of the present utility model.

[0027] Figure 6 A structural diagram of the expansion component of a preferred embodiment of the present utility model.

[0028] Figure 7 A structural diagram of the bushing of a preferred embodiment of the present utility model.

[0029] Figure 8 A structural diagram of the main shaft of a preferred embodiment of the present utility model.

[0030] Description of the reference numerals

[0031] Main shaft 100

[0032] Rotor 200

[0033] Bushing 300

[0034] Support circlip 310

[0035] Slit 320

[0036] Opening and closing part 330

[0037] Extension part 340

[0038] Gear assembly 400

[0039] First gear component 410

[0040] Second gear component 420

[0041] Meshing part 421

[0042] Driving part 422

[0043] Limit groove 423

[0044] Planet gear 430

[0045] Guide component 500

[0046] Guide part 510

[0047] Expansion component 600

[0048] Limit block 610

[0049] Slider 620

[0050] Expansion shape 630

[0051] Return component 700

[0052] Shaft bracket 810

[0053] Housing 820

[0054] Bottom cover 900

[0055] Gear shaft 910 Detailed implementation mode

[0056] The following is a preferred embodiment, and the accompanying drawings are used to more clearly and completely illustrate the present invention.

[0057] As Figures 1 - 8 shown, this embodiment discloses a water pump. In this embodiment, the axial direction refers to the direction parallel to or coincident with the axis of the main shaft 100, and the radial direction refers to the direction parallel to or coincident with the radial direction of the main shaft 100. Among them, as Figures 1 - 5 shown, the water pump of this embodiment includes a rotor 200 and a main shaft 100. The rotor 200 rotates around the main shaft 100, and the main shaft 100 is rotatably arranged. The water pump also includes a return component 700, a shaft sleeve 300, a gear assembly 400, a relatively stationary guiding component 500, and an expanding component 600. The gear assembly 400 includes a first gear component 410 and a second gear component 420 that are directly or indirectly driven. Among them, the shaft sleeve 300 is relatively fixed inside the rotor 200 and rotates relative to the main shaft 100. The shaft sleeve 300 is arranged to be expandable and deformable and recoverable in the radial direction. The first gear component 410 cooperates with the main shaft 100 and rotates together; the second gear component 420 cooperates with the expanding component 600 and restricts relative movement along the axial direction to each other, and does not restrict relative movement along the axial direction; the guiding component 500 is arranged to guide the expanding component 600 along the axial direction to the position where the shaft sleeve 300 is expanded and deformed, and to guide the expanding component 600 along the axial direction to the position where it is separated from the shaft sleeve 300; the return component 700 is compressed during the movement of the expanding component 600 towards the shaft sleeve 300 and directly or indirectly applies a restoring force to the expanding component 600.

[0058] The return component 700 in this embodiment can be a spring, a conical spring or other components with elastic recovery functions. The return component 700 can directly contact the expanding component 600 for recovery, or can indirectly act on the expanding component 600 through other components. The relatively stationary guiding component 500 means that the guiding component 500 remains stationary relative to other moving components of the water pump.

[0059] In this embodiment, the main shaft 100 is fixed under normal conditions of the water pump, and the rotor 200 and the shaft sleeve 300 rotate together around the main shaft 100. When the main shaft 100 and the shaft sleeve 300 are abnormally adhered together, the rotation of the rotor 200 can drive the shaft sleeve 300 and the main shaft 100 to rotate together. The main shaft 100 drives the first gear component 410 and the second gear component 420 to rotate, and further drives the expansion component 600 to rotate synchronously. The expansion component 600 moves towards the shaft sleeve 300 under the guidance of the guiding component 500. When it moves to a position near the shaft sleeve 300, such as the lower edge, while the expansion component 600 rotates, it expands the shaft sleeve 300 outwards to move away from the main shaft 100. The adhesion force between the shaft sleeve 300 and the main shaft 100 is destroyed, and the two are separated, releasing the stuck state due to adhesion. After the shaft sleeve 300 is separated, the rotor 200 can no longer transmit the rotational force to the expansion component 600 through the main shaft 100. The restoring component 700 starts to release the restoring force and drives the expansion component 600 to move back to the initial state. The shaft sleeve 300 resets and contracts to the state before expansion, thereby realizing the automatic release of the adhesion between the main shaft 100 and the rotor 200 of the water pump. The recoverable shaft sleeve 300 and the expansion component 600 can also cope with the occurrence of the next adhesion to achieve repeated use.

[0060] As Figure 2 shown, in a preferred embodiment, the water pump further includes a shaft support 810, and one end of the main shaft 100 away from the expansion component 600 is limited in the shaft support 810. The shaft support 810 supports the main shaft 100 on the one hand and allows the main shaft 100 to rotate relative to it on the other hand. In other embodiments, other structures can also support and limit the main shaft 100.

[0061] As Figure 3 、 Figure 6 and Figure 7 shown, in a preferred embodiment, one side of the expansion component 600 facing the shaft sleeve 300 has an expansion shape 630, the radial dimension of the expansion shape 630 changes along the axial direction, one side of the opening and closing part 330 facing the guiding component 500 has an extension part 340, and the extension part 340 contacts the expansion shape 630 and expands as the radial dimension of the expansion shape 630 becomes larger. Through the cooperation of the expansion shape 630 and the extension part 340, the rotational force can be more effectively converted into the expansion of the opening and closing part 330. In other embodiments, the expansion component 600 can also be set into other shapes that contribute to radial expansion caused by rotation.

[0062] As Figures 3 - 5As shown, in a preferred embodiment, the gear assembly 400 further includes a planetary gear 430. The planetary gear 430 surrounds and meshes with the first gear component 410. A meshing portion 421 of the second gear component 420 surrounds the outside of the planetary gear 430 and the first gear component 410 and meshes with the planetary gear 430. A driving portion 422 of the second gear component 420 is sleeved on the periphery of the main shaft 100 and cooperates with the expanding member 600. Thus, the main shaft 100, the first gear component 410, the planetary gear 430, and the second gear component 420 can be stacked in the radial direction, saving axial space. In other embodiments, other arrangements may also be possible. The water pump further includes a bottom cover 900. A gear shaft 910 for connecting gears is provided on the bottom cover 900. As Figure 3 As shown, the above structures inside the water pump are all accommodated by the housing 820. The housing 820 can be a structure in a known water pump or other structures isolated from the space below.

[0063] As Figures 3 - 6 As shown, in a preferred embodiment, the driving portion 422 includes a limiting groove 423 extending axially. The expanding member 600 has a limiting block 610 that cooperates with the limiting groove 423. The limiting groove 423 and the limiting block 610 guide the sliding of the expanding member 600, with a simple structure and strong movement reliability of the expanding member 600. In other embodiments, other guiding methods may also be possible.

[0064] As Figures 3 - 6 As shown, in a preferred embodiment, a part of the guiding member 500 is sleeved on the periphery of the meshing portion 421. A guiding portion 510 of the guiding member 500 is sleeved on the periphery of the main shaft 100 and cooperates with the expanding member 600. Thus, the guiding member 500, the main shaft 100, the first gear component 410, the planetary gear 430, and the second gear component 420 can be stacked in the radial direction, saving axial space. In other embodiments, other arrangements may also be possible.

[0065] As Figures 3 - 6 As shown, in a preferred embodiment, the expanding member 600 is annular. The inner ring side of the expanding member 600 cooperates with the driving portion 422, and the outer ring side of the expanding member 600 cooperates with the guiding portion 510. Thus, the expanding member 600 is located between the guiding member 500 and the second gear component 420 in the radial direction, saving axial space. In other embodiments, other arrangements may also be possible.

[0066] As Figures 3 - 6As shown, in a preferred embodiment, the guiding portion 510 includes a spiral guide rail, and the expanding member 600 has a slider 620 that cooperates with the spiral guide rail. The spiral guide rail facilitates guiding the expanding member 600 to move axially while rotating. In other embodiments, other guiding methods may also be used.

[0067] As Figure 7 shown, in a preferred embodiment, one end of the bushing 300 close to the expanding member 600 is formed with a slit 320, 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 radially and restored. The opening and closing portions 330 formed through the slit 320 have more elasticity to facilitate expansion. In other embodiments, other variable forms may also be used, such as elastic deformation of the material of the bushing 300 itself, or elastic deformation realized through an elastic structure formed by other means.

[0068] As Figure 7 shown, in a further preferred embodiment, a support snap spring 310 is connected to the side of the opening and closing portion 330 facing the rotor 200. The support snap spring 310 can provide an inward contracting force to the opening and closing portion 330, facilitating fixing 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 spring 310 may not be provided, and the bushing can return to its original state by its own elastic recovery, or other structures connected to the opening and closing portion 330 or the reset structures on the rotor 200 and the main shaft 100 can help the opening and closing portion 330 to return.

[0069] As Figure 1 、 Figure 7 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, facilitating 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.

[0070] As Figure 8 shown, in a preferred embodiment, the lower end of the main shaft 100 is a hexagonal limiting shape, which is adapted to the shape of the hole of the first gear component 410. This prevents relative rotation between the main shaft 100 and the first gear component 410. In other embodiments, other fixing methods may also be used.

[0071] 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 main shaft and rotor structures in other fields. The utility model realizes the automatic release of the adhesion between the main shaft 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.

[0072] 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, the rotor rotates around the main shaft, and is characterized in that, The main shaft is rotatably arranged. The water pump further includes a restoring member, a bushing, a gear assembly, a guiding member and an expanding member that are relatively stationary. The gear assembly includes a first gear member and a second gear member that are directly or indirectly driven. Among them, the bushing is relatively fixed to the inner side of the rotor, and the bushing rotates relative to the main shaft. The bushing is arranged to be radially expandable and deformable and recoverable; the first gear member is engaged with the main shaft and rotates together therewith; the second gear member is engaged with the expanding member and is axially restricted from relative movement therebetween and is not restricted from relative movement along the axial direction; the guiding member is arranged to axially guide the expanding member to a position where the bushing is expanded and deformed, and axially guide the expanding member to a position where it is separated from the bushing; the restoring member is compressed during the movement of the expanding member towards the bushing, and directly or indirectly applies a restoring force to the expanding member.

2. The water pump according to claim 1, wherein One end of the bushing close to the expanding member is formed with a slit, and at least two opening and closing portions are formed through the slit. The distance between the opening and closing portions is radially expandable and deformable and recoverable.

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

4. The water pump according to claim 2, characterized in that, One side of the expanding member facing the bushing has an expanding shape, the radial dimension of the expanding shape varies around the axial direction, one side of the opening and closing portion facing the guiding member has an extending portion, and the extending portion contacts the expanding shape and expands as the radial dimension of the expanding shape increases.

5. The water pump according to claim 1, characterized in that, The gear assembly further includes a planetary gear. The planetary gear surrounds and meshes with the first gear member. One meshing portion of the second gear member surrounds the outside of the planetary gear and the first gear member and meshes with the planetary gear. One driving portion of the second gear member is sleeved on the periphery of the main shaft and is engaged with the expanding member.

6. The water pump according to claim 5, wherein, The driving portion includes a limiting groove extending along the axial direction, and the expanding member has a limiting block that cooperates with the limiting groove.

7. The water pump according to claim 5, characterized in that, A part of the guiding member is sleeved on the periphery of the meshing portion, and one guiding portion of the guiding member is sleeved on the periphery of the main shaft and is engaged with the expanding member.

8. The water pump according to claim 7, characterized in that, The expanding member is annular. The inner ring side of the expanding member is engaged with the driving portion, and the outer ring side of the expanding member is engaged with the guiding portion.

9. The water pump according to claim 7, characterized in that, The guiding portion includes a spiral guide rail, and the expanding member has a slider that cooperates with the spiral guide rail.

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

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