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, the shaft sleeve is relatively fixed on the inner side of a rotor, and the shaft sleeve 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 component is in direct or indirect meshing transmission with the expansion component; the guide part is arranged to guide the expansion part to the position where the shaft sleeve is expanded and deformed in the radial direction and guide the expansion part to the position where the shaft sleeve is disengaged in the radial direction. The return member directly or indirectly applies a return force to 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 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 together. If the starting torque of the water pump cannot make the rotor 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 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 gets jammed, the staff can apply force to the shaft support from the opening to make the shaft support rotate, thereby driving the main shaft to generate axial displacement to separate the main shaft from the rotor. However, it cannot automatically solve the jamming problem, nor can it 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 comprises a rotor and a main shaft, wherein the rotor rotates around the main shaft, and the main shaft is rotatably arranged. The water pump also comprises a return component, a sleeve, a gear assembly, a relatively stationary guide component, and an expansion component. The gear assembly comprises a first gear component and a second gear component which are directly or indirectly transmitted, wherein the sleeve is relatively fixed to the inner side of the rotor, and the sleeve rotates relative to the main shaft, and the sleeve is arranged to be expandable, deformable and returnable in the radial direction; the first gear component cooperates with the main shaft and rotates together; the second gear component is directly or indirectly meshed with the expansion component for transmission; the guide component is arranged to guide the expansion component to a position where the sleeve is expanded and deformed along the radial direction, and to guide the expansion component to a position where it is separated from the sleeve along the radial direction; the return component is subjected to pressure during the rotation of the main shaft, and directly or indirectly applies a return force to the main shaft.

[0007] In this solution, the main shaft of the water pump is fixed in the normal state, and the rotor and the sleeve rotate together around the main shaft. When the main shaft and the sleeve are abnormally adhered together, the rotation of the rotor can drive the sleeve and the main shaft to rotate together, and the main shaft drives the first gear component and the second gear component to rotate. The expansion component is driven by the second gear component through meshing, and at the same time moves radially toward the sleeve under the guidance of the guide component. When the guide component is close to the sleeve, such as the lower flange of the sleeve, the guide component continues to expand outward and expands the sleeve outward at the same time. The adhesion between the main shaft and the sleeve is destroyed, and the two are separated, and the adhesion and stuck state is released. After the sleeve is separated, the rotor cannot give the first gear component a rotational force through the main shaft, and the return component begins to release, driving the main shaft and the first gear component and the second gear component to rotate in the opposite direction, so that the expansion component is recovered to the original position to separate from the sleeve. After the expansion force of the expansion component is gone, the sleeve is reset and contracted to the state before expansion. This enables the water pump to automatically release the adhesion between the main shaft and the rotor, and the recoverable sleeve and expansion component can also cope with the next adhesion to achieve reuse.

[0008] Preferably, a slit is formed at one end of the sleeve near the expansion member, and at least two opening and closing parts are formed by the slit, and the distance between the opening and closing parts can be expanded, deformed and restored in the radial direction. The opening and closing parts formed by the slit have more elasticity to facilitate expansion.

[0009] Preferably, a support spring is connected to the side of the opening and closing portion facing the rotor, and the support spring can provide an inward contraction force to the opening and closing portion, so as to facilitate the contraction of the opening and closing portion.

[0010] Preferably, the expansion component includes an expansion portion extending along the axial direction, and the expansion portion is located radially inward of the opening and closing portion. The expansion can be better supported on the opening and closing portion through the expansion portion.

[0011] 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 is directly or indirectly meshed and driven with the expansion component. Thus, the main shaft, the first gear component, the planetary gear and the second gear component can be stacked in the radial direction, saving the axial space.

[0012] Preferably, a driving portion of the second gear component includes transmission teeth, and the expansion component includes a rack portion. The rack portion and the transmission teeth are indirectly meshed and driven through an intermediate gear. Multiple intermediate gears can drive multiple rack portions to move radially simultaneously.

[0013] Preferably, the guiding component is sleeved around the periphery of the second gear component, and a guiding groove extending radially is formed on the guiding component. The rack portion is in sliding fit with the guiding groove, and the intermediate gear is defined to rotate on the guiding component. Thus, 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 the axial space. The guiding groove can guide the movement of the rack portion without deviation.

[0014] Preferably, the intermediate gear further includes an inner meshing portion and an outer meshing portion. The inner meshing portion meshes with the transmission teeth and is located between the guiding component and the second gear component, and the outer meshing portion meshes with the rack portion and is located on the side of the guiding component facing the shaft sleeve. Thus, both the expansion component and the intermediate gear are accommodated in the guiding component and are not easily interfered by external objects in the transmission.

[0015] Preferably, the restoring component is a coil spring. The water pump further includes a housing and a bottom cover for accommodating the rotor and the main shaft. The bottom cover is located on the side of the first gear component away from the shaft sleeve. The coil spring is accommodated between the bottom cover and the bottom of the housing, and a part of the first gear component passes through the bottom cover and is connected to the coil spring. Thus, the coil spring is placed in a suitable position without occupying the space of other moving components. The bottom cover isolates the coil spring from other components to avoid movement interference.

[0016] 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.

[0017] 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic cross-sectional view of the water pump according to a preferred embodiment of the present utility model.

[0019] Figure 2 is Figure 1 the enlarged view of part A in

[0020] Figure 3 is Figure 1 the enlarged view of part B in

[0021] Figure 4 the exploded view of the internal structure of the preferred embodiment of the present utility model.

[0022] Figure 5 the structural view of the expansion member of the preferred embodiment of the present utility model.

[0023] Figure 6 the structural view of the second gear member of the preferred embodiment of the present utility model.

[0024] Figure 7 the connection view of the internal structure of the preferred embodiment of the present utility model.

[0025] Figure 8 the structural view of the bushing and the main shaft of the preferred embodiment of the present utility model.

[0026] Explanation of reference numerals

[0027] Main shaft 100

[0028] Rotor 200

[0029] Bushing 300

[0030] Support circlip 310

[0031] Slit 320

[0032] Opening and closing part 330

[0033] Gear assembly 400

[0034] First gear member 410

[0035] Second gear member 420

[0036] Meshing part 421

[0037] Driving part 422

[0038] Planet gear 430

[0039] Guide member 500

[0040] Guide groove 510

[0041] Expansion member 600

[0042] Expanding part 610

[0043] Rack part 620

[0044] Intermediate gear 630

[0045] Inner meshing portion 631

[0046] Outer meshing portion 632

[0047] Return member 700

[0048] Shaft bracket 810

[0049] Housing 820

[0050] Bottom cover 900

[0051] Gear shaft 910 Specific implementation mode

[0052] The following is a preferred embodiment, and the present utility model will be described more clearly and completely in conjunction with the accompanying drawings.

[0053] As Figures 1-8 shown, this embodiment discloses a water pump. In this embodiment, the axial direction refers to the direction parallel or coincident with the axis of the main shaft 100, and the radial direction refers to the direction parallel or coincident with the radial direction of the main shaft 100. Among them, as Figures 1-6 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 member 700, a shaft sleeve 300, a gear assembly 400, a relatively stationary guiding member 500, and an expansion member 600. The gear assembly 400 includes a first gear member 410 and a second gear member 420 that are directly or indirectly driven. Among them, the shaft sleeve 300 is relatively fixed to the inner side of the rotor 200 and rotates relative to the main shaft 100. The shaft sleeve 300 is arranged to be radially expandable and deformable and recoverable; the first gear member 410 cooperates with the main shaft 100 and rotates together; the second gear member 420 is directly or indirectly meshed and driven with the expansion member 600; the guiding member 500 is arranged to guide the expansion member 600 along the radial direction to the position where the shaft sleeve 300 is expanded and deformed, and to guide the expansion member 600 along the radial direction to the position where it is disengaged from the shaft sleeve 300; the return member 700 is compressed during the rotation of the main shaft 100 and directly or indirectly applies a restoring force to the main shaft 100.

[0054] The return member 700 in this embodiment can be a coil spring or other components with elastic recovery function. The return member 700 can directly contact the main shaft 100 for recovery, or can indirectly act on the main shaft 100 through other components. The relatively stationary guiding member 500 means that the guiding member is stationary relative to other moving components of the water pump.

[0055] 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, and the main shaft 100 drives the first gear component 410 and the second gear component 420 to rotate, and the expansion component 600 is driven by the second gear component 420 through meshing transmission, and at the same time, it moves radially toward the sleeve 300 under the guidance of the guide component 500. When the guide component 500 approaches the sleeve 300, such as the lower flange of the sleeve 300, the guide component 500 continues to expand outward, and at the same time, the sleeve 300 is expanded 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. After the sleeve 300 is separated, the rotor 200 cannot provide the first gear member 410 with a rotational force through the main shaft 100, and the return member 700 begins to release, driving the main shaft 100 and the first gear member 410 and the second gear member 420 to rotate in the opposite direction, so that the expansion member 600 is recovered to the original position to be separated from the sleeve 300. After the expansion force of the expansion member 600 is gone, the sleeve 300 is reset and contracted to the state before expansion. In this way, the water pump automatically releases the adhesion between the main shaft 100 and the rotor 200, and the recoverable sleeve 300 and the expansion member 600 can also cope with the next adhesion to achieve reuse.

[0056] like Figure 2 As shown, in a preferred embodiment, the water pump further comprises 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 one hand, and allows the main shaft 100 to rotate on the other hand. In other embodiments, other structures may also be used to support and limit the main shaft 100.

[0057] like Figures 3-6 As shown, in a preferred embodiment, the gear assembly 400 further includes a planetary gear 430, which surrounds and meshes with the first gear component 410, and an engaging portion 421 of the second gear component 420 surrounds the outer sides of the planetary gear 430 and the first gear component 410 and meshes with the planetary gear 430, and a driving portion 422 of the second gear component 420 is sleeved on the periphery of the main shaft 100 and directly or indirectly meshes with the expansion component 600 for transmission. In this way, 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 are also possible. For example Figure 3 As shown, the cover 820 may be a structure in a known water pump, or other structure isolated from the space below.

[0058] like Figures 3-6As shown, in a preferred embodiment, a driving portion 422 of the second gear member 420 includes transmission teeth, the expanding member 600 includes a rack portion 620, and the rack portion 620 and the transmission teeth are indirectly meshed and transmitted through an intermediate gear 630. A plurality of intermediate gears 630 can drive a plurality of rack portions 620 to move radially simultaneously. In other embodiments, other arrangements may also be possible.

[0059] As Figures 3-6 shown, in a preferred embodiment, the guiding member 500 is sleeved around the second gear member 420, and a radially extending guiding groove 510 is formed on the guiding member 500. The rack portion 620 is slidably engaged with the guiding groove 510, and the intermediate gear 630 is defined to rotate on the guiding member 500. Thus, the guiding member 500, the main shaft 100, the first gear member 410, the planetary gear 430, and the second gear member 420 can be stacked in the radial direction, saving axial space. The guiding groove 510 can guide the movement of the rack portion 620 without deviation. In other embodiments, other guiding methods may also be possible.

[0060] As Figures 3-6 shown, in a preferred embodiment, the intermediate gear 630 further includes an inner meshing portion 631 and an outer meshing portion 632. The inner meshing portion 631 is meshed with the transmission teeth and is located between the guiding member 500 and the second gear member 420, and the outer meshing portion 632 is meshed with the rack portion 620 and is located on the side of the guiding member 500 facing the shaft sleeve 300. Thus, both the expanding member 600 and the intermediate gear 630 are accommodated within the guiding member 500 and are not easily interfered with by external objects during transmission. In other embodiments, other arrangements may also be possible.

[0061] As Figures 3-6 shown, in a preferred embodiment, the restoring member 700 is a coil spring. The water pump further includes a housing 820 that houses the rotor 200 and the main shaft 100, and a bottom cover 900. The bottom cover 900 is located on the side of the first gear member 410 away from the shaft sleeve 300. The coil spring is accommodated between the bottom cover 900 and the bottom of the housing 820, and a part of the first gear member 410 passes through the bottom cover 900 and is connected to the coil spring. Thus, the coil spring is placed in a suitable position without occupying the space of other moving parts. The bottom cover 900 isolates the coil spring from other components and avoids movement interference. The bottom cover 900 is provided with a gear shaft 910 for cooperating with the planetary gear 430.

[0062] As Figure 7 and Figure 8As 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 is radially expandable and recoverable. The opening and closing portions 330 formed through the slit 320 have more elasticity to facilitate expansion. In other embodiments, it may also be other variable forms, such as elastic deformation of the material of the bushing 300 itself, or an elastic structure formed by other means to achieve elastic deformation.

[0063] As Figure 7 and 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.

[0064] 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 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.

[0065] As Figure 5 and Figure 7 shown, the expansion member 600 of this embodiment includes a spreading portion 610 extending along the axial direction, and the spreading portion 610 is located inside the opening and closing portion 330 in the radial direction. The opening and closing portion 330 can be better supported for expansion through the spreading portion 610.

[0066] 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 member 410. This prevents relative rotation between the main shaft 100 and the first gear member 410. In other embodiments, other fixing methods may also be used.

[0067] The water pump of this embodiment can be applicable to the relevant water pumps in water heaters, and 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.

[0068] 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, characterized in that, The main shaft is rotatably arranged. The water pump further includes a restoring member, a shaft sleeve, a gear assembly, a relatively stationary guiding member, and an expanding member. The gear assembly includes a first gear member and a second gear member that are directly or indirectly driven. Among them, The shaft sleeve is relatively fixed to the inner side of the rotor and rotates relative to the main shaft. The shaft sleeve is arranged to be radially expandable and deformable and recoverable. The first gear member is engaged with the main shaft and rotates together with it; the second gear member is directly or indirectly meshed and driven with the expanding member. The guiding member is arranged to guide the expanding member along the radial direction to a position where the shaft sleeve is expanded and deformed, and to guide the expanding member along the radial direction to a position where it disengages from the shaft sleeve. The restoring member is compressed during the rotation of the main shaft and directly or indirectly applies 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 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 circlip is connected to the side of the opening and closing portion facing the rotor.

4. The water pump according to claim 2, wherein, The expanding member includes a spreading portion extending along the axial direction, and the spreading portion is located inside the radial direction of the opening and closing portion.

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 directly or indirectly meshed and driven with the expanding member.

6. The water pump according to claim 1, wherein, One driving portion of the second gear member includes transmission teeth. The expanding member includes a rack portion. The rack portion and the transmission teeth are indirectly meshed and driven through an intermediate gear.

7. The water pump according to claim 6, characterized in that, The guiding member is sleeved on the periphery of the second gear member, and a guiding groove extending radially is formed on the guiding member. The rack portion is slidably engaged with the guiding groove, and the intermediate gear is limited to rotate on the guiding member.

8. The water pump according to claim 7, wherein, The intermediate gear further includes an inner meshing portion and an outer meshing portion. The inner meshing portion meshes with the transmission teeth and is located between the guiding member and the second gear member. The outer meshing portion meshes with the rack portion and is located on the side of the guiding member facing the shaft sleeve.

9. The water pump according to claim 1, characterized in that, The restoring member is a coil spring. The water pump further includes a housing for accommodating the rotor and the main shaft and a bottom cover. The bottom cover is located on the side of the first gear member away from the shaft sleeve. The coil spring is accommodated between the bottom cover and the bottom of the housing. A part of the first gear member passes through the bottom cover and is connected to the coil spring.

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

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