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 expansion part is in sliding connection with the second gear part and the first gear part, and the relatively static guide part and the relatively rotating second gear part guide the expansion part to the position where the shaft sleeve is expanded and deformed along the plane and guide the expansion part to the position where the expansion part is separated from the shaft sleeve along the plane; the return member is pressed during rotation of the main shaft and 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 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 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 stuck, 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 an axial displacement to separate the main shaft from the rotor. However, it is impossible to automatically solve the stuck problem, and it is also impossible to 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 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 inside the rotor and rotates relative to the main shaft. The shaft sleeve is arranged to be radially expandable and deformable and recoverable;

[0008] The first gear member cooperates with the main shaft and rotates together;

[0009] The expansion member is slidably connected to the second gear member and the first gear member, and the relatively stationary guide member and the relatively rotating second gear member together guide the expansion portion along the plane to a position where the sleeve is expanded and deformed, and guide the expansion portion along the plane to a position where the sleeve is separated from the sleeve;

[0010] The restoring member is compressed during the rotation of the main shaft and directly or indirectly applies a restoring force to the main shaft.

[0011] In this solution, the main shaft of the water pump is fixed in a 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, the main shaft drives the first gear component and the second gear component to rotate, and the second gear component drives the expansion component to move radially toward the sleeve on the plane. When the guide component approaches the sleeve, such as the lower flange of the sleeve, the guide component continues to expand outward and simultaneously expands the sleeve outward. After the sleeve is separated, the adhesion force between the main shaft and the sleeve is destroyed, and the two are separated, and the adhesion and stuck state is released. 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 its 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. The shaft sleeve is restored and contracted to the state before expansion, thereby realizing 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 next occurrence of adhesion, so as to realize repeated use.

[0012] Preferably, a slit is formed at one end of the sleeve near the expansion portion, and at least two opening and closing portions are formed by the slit, and the distance between the opening and closing portions can be expanded, deformed and restored in the radial direction. The opening and closing portions formed by the slit have more elasticity to facilitate expansion.

[0013] 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.

[0014] Preferably, the expansion component includes an expansion portion extending in the axial direction, and the expansion portion is located radially inward of the opening and closing portion. The axially extending expansion portion can increase contact with the sleeve so as to stably expand the sleeve.

[0015] Preferably, the gear assembly further comprises a planetary gear, the planetary gear surrounds and meshes with the first gear component, and the second gear component surrounds the planetary gear and the outer side of the first gear component and meshes with the planetary gear. Thus, 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 second gear component has a first sliding groove, the guiding component has a second sliding groove, and the expanding component is slidably engaged with the first sliding groove and the second sliding groove respectively, wherein at least a part of the first sliding groove and the second sliding groove gradually increases in radial distance relative to the axis. Thus, under the cooperation of the first sliding groove and the second sliding groove, the expanding component will change its distance relative to the axis, so as to approach or move away from the shaft sleeve. And due to the common restraint of the first sliding groove and the second sliding groove, the expanding component will move more stably relatively.

[0017] Preferably, both the first sliding groove and the second sliding groove are in an arc shape with a gradually increasing radial distance relative to the axis. The arc shape can make the movement of the expanding component smoother, especially reducing the resistance during the movement of the expanding component in the first sliding groove and the second sliding groove simultaneously.

[0018] Preferably, the guiding component is sleeved outside the second gear component. The expanding component includes a first guide rod, a second guide rod, and a limiting portion respectively connected to the first guide rod and the second guide rod. The first guide rod slides with the first sliding groove, the second guide rod slides with the second sliding groove, and the limiting portion is limited to slide between the guiding component and the second gear component. The limiting portion can limit the axial movement of the expanding component, so as to ensure the relative cooperation between the first guide rod and the first sliding groove, and the relative cooperation between the second guide rod and the second sliding groove. At the same time, the upper and lower surfaces of the limiting portion can support the expanding component and the guiding component to avoid their contact.

[0019] Preferably, the restoring component is a torsion 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 torsion spring is accommodated between the bottom cover and the bottom of the housing. A part of the first gear component passes through the bottom cover and is connected to the torsion spring. Thus, the torsion spring is placed in a suitable position without occupying the space of other moving components. The bottom cover isolates the torsion spring from other components to avoid movement interference.

[0020] Preferably, the water pump further includes a shaft bracket. One end of the main shaft away from the expanding 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 the 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 is the exploded view of the internal structure of the preferred embodiment of the present utility model.

[0026] Figure 5 is the schematic diagram of the cooperation between the guiding component and the gear component of the preferred embodiment of the present utility model.

[0027] Figure 6 is the schematic diagram of the first sliding groove and the second sliding groove of the preferred embodiment of the present utility model.

[0028] Figure 7 is the structural schematic diagram of the expansion component of the preferred embodiment of the present utility model.

[0029] Figure 8 is the structural schematic diagram of the bushing and the main shaft of the preferred embodiment of the present utility model.

[0030] Explanation of 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] Gear assembly 400

[0038] First gear component 410

[0039] Second gear component 420

[0040] First sliding groove 421

[0041] Meshing part 422

[0042] Planetary gear 430

[0043] Guiding component 500

[0044] Second sliding groove 510

[0045] Expansion component 600

[0046] First guide rod 610

[0047] Second guide rod 620

[0048] Limit part 630

[0049] Return component 700

[0050] Shaft support 810

[0051] Housing 820

[0052] Bottom cover 900

[0053] Gear shaft 910 Detailed implementation manner

[0054] The following is a preferred embodiment, and the present utility model will be described more clearly and completely in conjunction with the accompanying drawings.

[0055] 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 1-8 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 further 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 configured to be expandable and deformable and returnable in the radial direction; the first gear component 410 cooperates with the main shaft 100 and rotates together; the expanding component 600 is slidably connected to both the second gear component 420 and the first gear component 410. The relatively stationary guiding component 500 and the relatively rotating second gear component 420 together guide the expanding part along a plane to a position where the shaft sleeve 300 is expanded and deformed, and along the plane guide the expanding part to a position where it is separated from the shaft sleeve 300; the return component 700 is compressed during the rotation of the main shaft 100 and directly or indirectly applies a return force to the main shaft 100.

[0056] The return component 700 in this embodiment can be a coil spring or other components with elastic return function. The return component 700 can directly contact the main shaft 100 for return, or can indirectly act on the main shaft 100 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.

[0057] 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 first gear component 410 and the second gear component 420 to rotate, and the second gear component 420 drives the expansion component 600 to move radially toward the sleeve 300 on the plane. 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 expands the sleeve 300 outward at the same time. After the sleeve 300 is separated, 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. 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. The sleeve 300 is reset and contracted to the state before expansion, thereby realizing the automatic release of the main shaft 100 and the rotor 200 of the water pump. The recoverable sleeve 300 and the expansion member 600 can also cope with the next occurrence of adhesion, so as to achieve reuse.

[0058] 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.

[0059] 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 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. 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 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.

[0060] like Figure 5 and Figure 6As shown, in a preferred embodiment, the second gear member 420 has a first sliding groove 421, the guiding member 500 has a second sliding groove 510, and the expanding member 600 is slidably engaged with the first sliding groove 421 and the second sliding groove 510 respectively, wherein at least a part of the first sliding groove 421 and the second sliding groove 510 has a gradually increasing radial distance relative to the axis. Thus, under the cooperation of the first sliding groove 421 and the second sliding groove 510, the expanding member 600 will change its distance relative to the axis, so as to approach or move away from the sleeve 300. And due to the common restraint of the first sliding groove 421 and the second sliding groove 510, the expanding member 600 will move more stably. In other embodiments, other arrangements may also be possible.

[0061] As Figure 5 and Figure 6 shown, in a preferred embodiment, both the first sliding groove 421 and the second sliding groove 510 are arc-shaped with a gradually increasing radial distance relative to the axis. The arc shape can make the movement of the expanding member 600 smoother, especially reducing the resistance during the movement of the expanding member 600 in both the first sliding groove 421 and the second sliding groove 510. As Figure 6 shown, both the first sliding groove 421 and the second sliding groove 510 have a radially varying distance, and each point on the two has a corresponding equal radial distance. The changing trends of the first sliding groove 421 and the second sliding groove 510 are opposite. Therefore, during the rotation of the first sliding groove 421 relative to the second sliding groove 510, the overlapping position will be continuously changed. Since the expanding member 600 is engaged with both the first sliding groove 421 and the second sliding groove 510, it can only remain at the overlapping position of the two. Therefore, the change of the overlapping position drives the movement of the expanding member 600. In other embodiments, other extension methods of the sliding groove may also be possible.

[0062] As Figures 3-7 shown, in a preferred embodiment, the guiding member 500 is sleeved outside the second gear member 420. The expanding member 600 includes a first guide rod 610, a second guide rod 620, and a limiting portion 630 connected to the first guide rod 610 and the second guide rod 620 respectively. The first guide rod 610 slides in the first sliding groove 421, the second guide rod 620 slides in the second sliding groove 510, and the limiting portion 630 is limited to slide between the guiding member 500 and the second gear member 420. The limiting portion 630 can limit the axial movement of the expanding member 600, so as to ensure the relative cooperation between the first guide rod 610 and the first sliding groove 421, and the relative cooperation between the second guide rod 620 and the second sliding groove 510. At the same time, the upper and lower surfaces of the limiting portion 630 can support the expanding member 600 and the guiding member 500 to avoid their contact. In other embodiments, the expanding member may also be of other structural shapes.

[0063] AsFigure 3 and Figure 4 As shown in Figure 3 and Figure 4 , 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 a side of the first gear member 410 away from the bushing 300. The coil spring is housed between the bottom cover 900 and the bottom of the housing 820. 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 proper position without occupying the space of other moving parts. The bottom cover 900 isolates the coil spring from other components, avoiding movement interference. A gear shaft 910 is provided on the bottom cover 900 for mounting the planetary gear 430.

[0064] As Figure 7 shown, in a preferred embodiment, the expanding member 600 includes a spreading portion 640 that extends axially. Figure 7 Shown is a shape of the spreading portion 640. In other embodiments, the spreading portion 640 may also be other shapes. The spreading portion 640 is located radially inside the opening and closing portion 330. The axially extending spreading portion can increase the contact with the bushing 300 to stably expand the bushing 300.

[0065] As Figure 8 shown, in a preferred embodiment, a slit 320 is formed at one end of the bushing 300 close to the expanding 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 for easy 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.

[0066] As Figure 8 shown, in a further preferred embodiment, a support snap ring 310 is connected to a side of the opening and closing portion 330 facing the rotor 200. The support snap ring 310 can provide an inward contracting force to the opening and closing portion 330, facilitating the fixing of the bushing 300 and providing a force for the opening and closing portion 330 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 structures on the rotor 200 and the main shaft 100 may help the opening and closing portion 330 to recover.

[0067] As Figure 1 and Figure 8As 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 enables one end of the bushing 300 to expand or contract back. The cavity for accommodating the bushing 300 in the rotor 200 is a frustum-shaped structure, and the large frustum head portion mates with the openable end of the bushing 300 to facilitate the expansion of the bushing 300. When the water pump is operating normally, the rotor 200 and the bushing 300 are regarded as a whole and rotate around the main shaft 100.

[0068] 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 can also be used.

[0069] The water pump of this embodiment can be applied to relevant water pumps in water heaters, or can also be used in water pumps in other fields with similar main shaft and rotor structures. The present invention 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.

[0070] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only for illustration purposes. The protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

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 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 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 with it; the expanding member is slidably connected to both the second gear member and the first gear member. The relatively stationary guiding member and the relatively rotating second gear member together guide the expanding portion along a plane to a position where the bushing is expanded and deformed, and along the plane guide the expanding portion to a position where it disengages from the bushing; 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 bushing close to the expanding portion 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, The expanding member includes a spreading portion extending along the axial direction. The spreading portion is located radially inside 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. The second gear member surrounds the planetary gear and the first gear member on the outside and meshes with the planetary gear.

6. The water pump according to claim 1, characterized in that, The second gear member has a first sliding groove, and the guiding member has a second sliding groove. The expanding member is slidably engaged with the first sliding groove and the second sliding groove respectively. Among them, at least a part of the radial distance of the first sliding groove and the second sliding groove relative to the axis gradually increases.

7. The water pump according to claim 6, characterized in that, Both the first sliding groove and the second sliding groove are in an arc shape with a gradually increasing radial distance relative to the axis.

8. The water pump according to claim 6, characterized in that, The guiding member is sleeved on the outside of the second gear member. The expanding member includes a first guide rod, a second guide rod, and a limiting portion respectively connected to the first guide rod and the second guide rod. The first guide rod slides with the first sliding groove, the second guide rod slides with the second sliding groove, and the limiting portion is limited to slide between the guiding member and the second gear member.

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 bushing. 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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