Water pump

Abstract

The utility model provides a water pump which comprises a shaft sleeve, an expansion part, a first return part, a second return part, a moving assembly, a relatively static guide part and an extrusion part, the shaft sleeve is relatively fixed on the inner side of a rotor, and the shaft sleeve rotates relative to a main shaft; a cavity is formed in the tail end of the main shaft, an expansion component is contained in the cavity, a through groove allowing the expansion component to extend out in the radial direction is formed in the tail end of the main shaft, and the expansion component is arranged to be expandable, deformed and restored in the radial direction; the outer surface of the tail end of the main shaft is matched with the moving assembly, mutually limits relative movement in the axial direction and does not limit relative movement in the axial direction, and the guide part is spirally matched with the moving assembly to guide the axial movement of the moving assembly; and one end of the extrusion part abuts against the moving assembly, and the other end is used for entering the cavity and extruding the expansion part. 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 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 a receiving 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 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 pump 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, and the main shaft is rotatably arranged. The water pump further includes a shaft sleeve, an expansion component, a first return component, a second return component, a moving component, a relatively stationary guiding component, and a squeezing component. 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 retractable;

[0008] The end of the main shaft is provided with a cavity, and the cavity contains an expansion component. The end of the main shaft is provided with a through slot for the expansion component to extend radially, and the expansion component is configured to expand, deform and recover in the radial direction;

[0009] The outer surface of the distal end of the main shaft cooperates with the moving assembly, and restricts relative movement around the axial direction and does not restrict relative movement along the axial direction. The guide component is spirally engaged with the moving assembly to guide the axial movement of the moving assembly.

[0010] One end of the extrusion component abuts against the moving assembly, and the other end is used to enter the cavity and squeeze the expansion component;

[0011] The first restoring member acts on the moving component to provide a restoring force to move the moving component away from the expansion component, and the second restoring member acts on the expansion component and / or the pressing component to provide a restoring force to restore the expansion component.

[0012] In this solution, under normal conditions, the main shaft of the water pump is fixed, and the rotor and sleeve rotate together around the main shaft. When the main shaft and sleeve become abnormally adhered, the rotation of the rotor drives the moving assembly to rotate together. The moving assembly begins to move axially upward under the action of the spirally engaged guide component, simultaneously driving the extrusion component toward the main shaft. Due to the deceleration effect of the spiral engagement, the extrusion component exerts a significant upward force, which causes the extrusion component to compress the expansion component, causing it to expand and spread the sleeve outward. The adhesion between the sleeve and main shaft is broken, separating the two and releasing the stuck state. After the main shaft and rotor separate, the first return component drives the moving assembly to rotate in the opposite direction to return to its initial state. The second return component drives the expansion component and the extrusion component to reset. Without the expansion force of the expansion component, the sleeve returns to its pre-expanded state. This automatically releases the adhesion between the main shaft and rotor of the water pump, and the recoverable sleeve and expansion component can also handle the next occurrence of adhesion, enabling reuse.

[0013] 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.

[0014] 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, thereby facilitating the contraction of the opening and closing portion.

[0015] Preferably, the moving component includes an external moving part, a relatively stationary guiding part, and an internal moving part. Among them, the internal moving part abuts against the pressing component. The external moving part has opposite internal and external threads. The external thread of the external moving part is in spiral fit with the guiding component, and the internal thread of the external moving part is in spiral fit with the internal moving part. The guiding component is in cooperation with the internal moving part and mutually restricts relative movement around the axial direction and does not restrict relative movement along the axial direction. Thus, the internal moving part can have a moving stroke twice that of the external moving part, so that the pressing component can move farther and is more convenient to move away from the expanding component in a non-sticking state.

[0016] Preferably, one end of the pressing component is sleeved on the guiding component and abuts against the internal moving part. Thus, the cooperation mode of the pressing component with the guiding component and the internal moving part is simple, which is convenient for replacement, disassembly and assembly.

[0017] Preferably, the side of the expanding component facing the pressing component has a wedge-shaped concave shape, and the side of the pressing component facing the expanding component has a wedge-shaped convex shape. The wedge-shaped shape is more convenient for squeezing the expanding component outwards. And the wedge-shaped shape has a guiding effect, which is beneficial for the pressing component to enter the wedge-shaped concave shape of the expanding component.

[0018] Preferably, the first restoring component is located on the side of the guiding component away from the main shaft, and the first restoring component is arranged in the peripheral space of the moving component. Thus, the first restoring component and the guiding component make full use of the radial space and save the axial space.

[0019] Preferably, the water pump further includes a first restoring support. The first restoring support is connected to the first restoring component. The first restoring support is in cooperation with the moving component and mutually restricts relative movement around the axial direction and does not restrict relative movement along the axial direction. The first restoring support can act on the moving component with the restoring force more evenly.

[0020] Preferably, the water pump further includes a second restoring support. The restoring support is abutted between the second restoring component and the expanding component. The second restoring component acts on the expanding component through the second restoring support. The second restoring support can act on the expanding component with the restoring force more evenly.

[0021] Preferably, the water pump further includes a shaft support. One end of the main shaft away from the expanding component 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.

[0022] The positive progressive effect of the utility model is that the adhesion between the main shaft and the rotor of the water pump is automatically released, and the adhesion is automatically restored to cope with the next occurrence of adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional schematic diagram of a water pump according to a preferred embodiment of the present invention.

[0024] Figure 2 for Figure 1 Enlarged view of part A in .

[0025] Figure 3 for Figure 1 Enlarged view of part B in .

[0026] Figure 4 This is a schematic structural diagram of the main shaft of a preferred embodiment of the present utility model.

[0027] Figure 5 This is a schematic structural diagram of a shaft sleeve according to a preferred embodiment of the present invention.

[0028] Figure 6 This is an exploded schematic diagram of the internal structure of a preferred embodiment of the present invention.

[0029] Figure 7 This is an exploded schematic diagram of a moving assembly according to a preferred embodiment of the present invention.

[0030] Description of Reference Numerals

[0031] Spindle 100

[0032] Through slot 101

[0033] Expansion member 110

[0034] Rotor 200

[0035] Bushing 300

[0036] Support spring 310

[0037] Slit 320

[0038] Opening and closing portion 330

[0039] Mobile component 400

[0040] External moving parts 410

[0041] Guide groove 411

[0042] Internal moving parts 420

[0043] Guide member 430

[0044] Guide member 500

[0045] Extrusion component 600

[0046] First restoring component 710

[0047] Second restoring component 720

[0048] Shaft support 810

[0049] Housing 820

[0050] First restoring support 910

[0051] Second restoring support 920 Specific implementation mode

[0052] The following gives a preferred embodiment and combines the attached drawings to more clearly and completely illustrate the present utility model.

[0053] As Figures 1-7 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 1-5 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 further includes a shaft sleeve 300, an expansion component 110, a first restoring component 710, a second restoring component 720, a moving component 400, a relatively stationary guiding component 500, and an extrusion component 600. 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 radially expandable and deformable and recoverable; a cavity is provided at the end of the main shaft 100, and the expansion component 110 is accommodated in the cavity. A through groove 101 for the expansion component 110 to extend radially is provided at the end of the main shaft 100. The expansion component 110 is arranged to be radially expandable and deformable and recoverable; the outer surface of the end of the main shaft 100 cooperates with the moving component 400, and the relative movement around the axial direction is mutually restricted and the relative movement along the axial direction is not restricted. The guiding component 500 is in screw fit with the moving component 400 to guide the axial movement of the moving component 400; one end of the extrusion component 600 abuts against the moving component 400, and the other end is used to enter the cavity and extrude the expansion component 110; the first restoring component 710 acts on the moving component 400 to provide a restoring force for moving the moving component 400 away from the expansion component 110, and the second restoring component 720 acts on the expansion component 110 and / or the extrusion component 600 to provide a restoring force for the expansion component 110 to recover.

[0054] The return member 710 in this embodiment can be a coil spring or other component with elastic return function. The return member 710 can directly contact the moving assembly 400 to return the movement, or it can indirectly act on the moving assembly 400 through other components. The return member 720 can be a spring, a spring, or other component with elastic return function. The return member 720 can directly contact the expansion member 110 to return the movement, or it can indirectly act on the expansion member 110 through other components. The relatively stationary guide member 500 means that the guide member 500 remains stationary relative to the other moving components of the water pump.

[0055] In this embodiment, under normal conditions, the main shaft 100 of the water pump is fixed, 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 moving assembly to rotate together. The moving assembly 400 begins to move axially upward under the action of the spirally fitted guide component 500, while driving the extrusion component 600 to move toward the main shaft 100. Due to the deceleration effect of the spiral fit, the extrusion component 600 has a large upward force. The extrusion component 600 begins to squeeze the expansion component 110 to expand outward and open the sleeve 300. The adhesion between the sleeve 300 and the main shaft 100 is destroyed, and the two separate, releasing the adhesion and stuck state. After the main shaft 100 and the rotor 200 separate, the first return component 710 drives the moving assembly 400 to rotate in the opposite direction to restore to the initial state. The second return component 720 drives the expansion component 110 and the extrusion component 600 to reset. After the expansion force of the expansion member 110 is removed, the sleeve 300 returns to its pre-expanded state. This automatically releases the adhesion between the main shaft 100 and the rotor 200 of the water pump. The sleeve 300 and the expansion member 110 can also be restored to their original state in case of adhesion, thus enabling reuse.

[0056] like Figure 2 As shown, in a preferred embodiment, the water pump further includes a shaft support 810, and the end of the main shaft 100 away from the expansion component 110 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 be used to support and limit the main shaft 100. Figure 3 As shown, the above structures inside the water pump are all accommodated by the cover 820. The cover 820 can be a structure in a known water pump, or other structure isolated from the space below.

[0057] like Figure 4As shown, in a preferred embodiment, the lower end of the main shaft 100 has a hexagonal limiting shape, which is adapted to the shape of the hole of the external moving part 410, so that there is no relative rotation between the main shaft 100 and the external moving part 410. In other embodiments, other fixing methods may also be adopted.

[0058] As Figure 5 shown, in a preferred embodiment, a slit 320 is formed at one end of the bushing 300 close to the expansion part 110, and at least two opening and closing parts 330 are formed through the slit 320. The distance between the opening and closing parts 330 can be radially expanded and deformed and restored. The opening and closing parts 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 elastic deformation realized through an elastic structure formed by other means.

[0059] As Figure 5 shown, in a further preferred embodiment, a support snap ring 310 is connected to the side of the opening and closing part 330 facing the rotor 200. The support snap ring 310 can provide an inward contraction force to the opening and closing part 330, which is convenient for 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 ring 310 may not be provided, and its own elastic recovery may be used, or other structures connected to the opening and closing part 330 or the reset structure on the rotor 200 and the main shaft 100 may help the opening and closing part 330 to return.

[0060] As Figure 1 and Figure 5 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 part 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, which is convenient for the bushing 300 to expand. 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 6 and Figure 7As shown, in a preferred embodiment, the moving component 400 includes an external moving part 410, a relatively stationary guiding part 430, and an internal moving part 420. Among them, the internal moving part 420 abuts against the extrusion component 600. The external moving part 410 has opposite internal and external threads. The external thread of the external moving part 410 is in screw fit with the guiding component 500, and the internal thread of the external moving part 410 is in screw fit with the internal moving part 420. The guiding part 430 cooperates with the internal moving part 420 and mutually restricts relative movement around the axial direction and does not restrict relative movement along the axial direction. Thus, the internal moving part 420 can have a moving stroke twice that of the external moving part 410, so that the moving distance of the extrusion component 600 is farther and it is more convenient to move away from the expansion component 110 in a non-sticking state.

[0062] As Figure 3 and Figure 6 As shown, in a preferred embodiment, one end of the extrusion component 600 is sleeved on the guiding part 430 and abuts against the internal moving part 420. Thus, the cooperation mode of the extrusion component 600 with the guiding part 430 and the internal moving part 420 is simple, which is convenient for replacement, disassembly and assembly.

[0063] As Figure 3 and Figure 6 As shown, in a preferred embodiment, the side of the expansion component 110 facing the extrusion component 600 has a wedge-shaped concave shape, and the side of the extrusion component 600 facing the expansion component 110 has a wedge-shaped convex shape. It is more convenient to push the expansion component 110 outwards through the wedge-shaped shape. And the wedge-shaped shape has a guiding effect, which is beneficial for the extrusion component 600 to enter the wedge-shaped concave shape of the expansion component 110.

[0064] As Figure 3 and Figure 6 As shown, in a preferred embodiment, the first restoring component 710 is located on the side of the guiding part 430 away from the main shaft 100, and the first restoring component 710 is arranged in the peripheral space of the moving component 400. Thus, the first restoring component 710 and the guiding part 430 make full use of the radial space and save the axial space.

[0065] As Figure 3 and Figure 6 As shown, in a preferred embodiment, the water pump further includes a first restoring support 910. The first restoring support 910 is connected to the first restoring component 710, the first restoring support 910 cooperates with the moving component 400, and mutually restricts relative movement around the axial direction and does not restrict relative movement along the axial direction. The first restoring support 910 can apply the restoring force to the moving component 400 more evenly.

[0066] As Figure 3 andFigure 6 As shown, in a preferred embodiment, the water pump further includes a second return support 920, which is abutted between the second return member 720 and the expansion member 110. The second return member 720 acts on the expansion member 110 through the second return support 920. The second return support 920 can act on the expansion member 110 with a more uniform return force.

[0067] 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 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.

[0068] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only an example. 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, wherein the rotor rotates around the main shaft, wherein: The main shaft is rotatably arranged, and the water pump further comprises a shaft sleeve, an expansion component, a first return component, a second return component, a moving component, a relatively stationary guide component and an extrusion component, wherein, 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 expand, deform and recover in the radial direction. The end of the main shaft is provided with a cavity, and the cavity contains an expansion component. The end of the main shaft is provided with a through slot for the expansion component to extend radially, and the expansion component is configured to expand, deform and recover in the radial direction; The outer surface of the distal end of the main shaft cooperates with the moving assembly, and restricts relative movement around the axial direction and does not restrict relative movement along the axial direction. The guide component is spirally engaged with the moving assembly to guide the axial movement of the moving assembly. One end of the extrusion component abuts against the moving assembly, and the other end is used to enter the cavity and squeeze the expansion component; The first restoring member acts on the moving component to provide a restoring force to move the moving component away from the expansion component, and the second restoring member acts on the expansion component and / or the pressing component to provide a restoring force to restore the expansion component.

2. The water pump according to claim 1, characterized in that An end of the sleeve close to the expansion component is formed with a slit, and at least two opening and closing parts are formed by the slit. The distance between the opening and closing parts can be expanded, deformed and restored in the radial direction.

3. The water pump according to claim 2, characterized in that A supporting clamping spring is connected to a side of the opening and closing portion facing the rotor.

4. The water pump according to claim 1, wherein The moving assembly includes an external moving part, a relatively stationary guide part and an internal moving part, wherein the internal moving part abuts against the extrusion part, the external moving part has opposite internal and external threads, the external thread of the external moving part is spirally matched with the guide part, the internal thread of the external moving part is spirally matched with the internal moving part, the guide part is matched with the internal moving part, and they restrict relative movement around the axial direction and do not restrict relative movement along the axial direction.

5. The water pump according to claim 4, characterized in that One end of the extruding component is sleeved on the guide component and abuts against the internal moving component.

6. The water pump according to claim 1, wherein The expansion member has a wedge-shaped concave shape on one side facing the pressing member, and the pressing member has a wedge-shaped convex shape on one side facing the expansion member.

7. The water pump according to claim 4, characterized in that The first restoring member is located on a side of the guide member away from the main shaft, and the first restoring member is arranged in a peripheral space of the moving component.

8. The water pump according to claim 1, wherein The water pump further includes a first return support connected to the first return component. The first return support cooperates with the moving assembly and restricts relative movement around the axial direction and does not restrict relative movement along the axial direction.

9. The water pump according to claim 1, wherein: The water pump further includes a second return support, the return support being abutted between the second return member and the expansion member, and the second return member acts on the expansion member through the second return support.

10. The water pump according to any one of claims 1 to 9, characterized in that: The water pump further comprises a shaft support, and an end of the main shaft away from the expansion component is constrained in the shaft support.

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