Water pump

Abstract

The utility model provides a water pump which comprises a first return part, a second return part, a gear assembly, a relatively static guide part, a top block 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 expansion part is connected to the outer surface of a main shaft. The expansion part is extruded into or out of the inner side of the rotor along with the movement of the main shaft; the first gear component is matched with the main shaft and rotates together with the main shaft, and the tail end of the main shaft penetrates through the first gear component; and the second gear component is matched with the top block, limits relative movement around the axial direction, and does not limit relative movement along the axial direction. 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 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 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 rotate the shaft support, thereby driving the main shaft to generate axial displacement to separate the main shaft from the rotor. However, it is impossible to 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 problems through the following technical solutions:

[0006] A water pump includes a rotor and a main shaft. The rotor rotates around the main shaft. The main shaft moves axially within a limited distance. The main shaft is rotatably arranged. The water pump further includes a first restoring member, a second restoring member, a gear assembly, a relatively stationary guiding member, a top block, 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,

[0007] The expanding member is connected to the outer surface of the main shaft, and the expanding member squeezes into or out of the inner side of the rotor as the main shaft moves;

[0008] The first gear component is fitted with the main shaft and rotates therewith, and the end of the main shaft passes through the first gear component; the second gear component is fitted with the top block 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 top block axially to contact the end position of the main shaft during a certain rotation distance in the rotation process of the top block, axially guide the top block to move away from the end position of the main shaft during a certain rotation distance, and keep pressing the second restoring component at a certain rotation distance.

[0010] The first restoring component acts on the main shaft and provides a restoring force towards the top block, and the second restoring component acts on the top block and provides a restoring force towards the main shaft.

[0011] In this solution, the main shaft is fixed under normal conditions of the water pump, and the rotor rotates around the main shaft. When the main shaft and the rotor sleeve are abnormally adhered together, the rotation of the rotor can drive the main shaft to rotate together, and the main shaft drives the first gear component and the second gear component to rotate. The second gear component drives the top block to rotate. The top block first moves away from the position where it presses the second restoring component under the guidance of the guiding component. At this time, the second restoring component quickly bounces up the top block and is guided by the guiding component to the position where it contacts the end of the main shaft. The top block impacts the main shaft to cause the main shaft to move. The adhesion force between the main shaft and the rotor is damaged, and the two are separated, releasing the stuck state. During this process, the main shaft moves upward and drives the snap ring to move upward at the same time. The snap ring moves between the main shaft and the rotor. Due to the existence of the snap ring, the main shaft and the rotor still cannot rotate relative to each other. The rotor continues to rotate to drive the second restoring component to drive the top block to rotate. The top block then is guided to move away from the end position of the main shaft until it moves to the position where the second restoring component is pressed. At this time, under the pressure of the first restoring component, the main shaft moves down to its original position. In this way, the stuck repair is realized. Thus, the automatic release of the adhesion between the main shaft and the rotor of the water pump is achieved. The recoverable shaft sleeve and the expansion component can also cope with the occurrence of the next adhesion to achieve repeated use.

[0012] Preferably, a washer is arranged axially between the second gear component and the rotor, and the expansion component is squeezed into the inner side of the rotor or the inner side of the washer as the main shaft moves. The washer can pre-press the expansion component to make it enter the rotor more smoothly.

[0013] Preferably, the expansion component is a snap ring provided on the main shaft, and the snap ring has a bent shape. The snap ring is easy to install and replace, and the bent shape is convenient for squeezing into the rotor.

[0014] 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 extends toward a side away from the main shaft and cooperates with the top block. This enables the main shaft, the first gear component, the planetary gear, and the second gear component to be stacked in the radial direction, saving axial space.

[0015] Preferably, the driving portion includes a limiting edge extending along the axial direction, and the top block has a convex edge cooperating with the limiting edge. The limiting edge can drive the convex edge of the top block to rotate together during rotation, and at the same time, the convex edge of the top block can also move axially relative to the limiting edge.

[0016] Preferably, the inside of the top block has a cavity. The outside of the top block cooperates with the second gear component, and the inside of the cavity of the top block cooperates with the guiding component. This enables the second gear component, the top block, and the guiding component to be stacked in the radial direction, saving axial space.

[0017] Preferably, the inside of the guiding component has a cavity. The outside of the guiding component cooperates with the top block, and both ends of the second restoring component are limited in the cavity of the guiding component and the cavity of the top block. This enables the second restoring component to be kept in a stable position, without occupying space and without interfering with other moving components.

[0018] Preferably, the guiding component has a guiding groove which includes a horizontally extending section, a vertically extending section, and a returning section connected in a loop. Among them, the horizontally extending section is located on a side away from the main shaft, and the vertically extending section extends along the axial direction. The vertically extending section guides the top block axially to contact the end position of the main shaft during a certain rotational distance, the returning section axially guides the top block along the axial direction to disengage from the end of the main shaft during a certain rotational distance, and the horizontally extending section keeps squeezing the second restoring component in a certain rotational distance.

[0019] Preferably, a clamping groove is formed on a side of the horizontally extending section facing the main shaft. The restoring force of the second restoring component can push the top block into the clamping groove, so that when in an unjammed state, the top block can be more stably limited in the horizontally extending section and thus not be triggered to impact the main shaft.

[0020] Preferably, the water pump further includes a shaft bracket. One end of the main shaft away from the expansion component is limited in the shaft bracket and moves axially relative to the shaft bracket. Both ends of the first restoring component respectively abut against the shaft bracket and the main shaft. 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. The first restoring component also does not occupy other space.

[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 of the preferred embodiment of the present utility model.

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

[0024] Figure 3 It is Figure 1 The enlarged view of part B when the top block is not triggered in

[0025] Figure 4 It is Figure 1 The enlarged view of part B when the top block is triggered in

[0026] Figure 5 It is an exploded schematic view of the internal structure of the preferred embodiment of the present utility model.

[0027] Figure 6 It is a three-dimensional schematic view of the expansion component of the preferred embodiment of the present utility model.

[0028] Figure 7 It is a rear view schematic view of the expansion component of the preferred embodiment of the present utility model.

[0029] Figure 8 It is a front view schematic view of the expansion component of the preferred embodiment of the present utility model.

[0030] Figure 9 It is a structural schematic view of the support seat of the preferred embodiment of the present utility model.

[0031] Figure 10 It is a structural schematic view of the main shaft of the preferred embodiment of the present utility model.

[0032] Description of the Reference Numerals

[0033] Main shaft 100

[0034] Rotor 200

[0035] Top block 300

[0036] Convex edge 310

[0037] Gear assembly 400

[0038] First gear component 410

[0039] Second gear component 420

[0040] Engaging portion 421

[0041] Driving portion 422

[0042] Planetary gear 430

[0043] Guiding member 500

[0044] Horizontal section 510

[0045] Vertical section 520

[0046] Return section 530

[0047] Card slot 540

[0048] Expansion member 600

[0049] First restoring member 710

[0050] Second restoring member 720

[0051] Shaft bracket 810

[0052] Housing 820

[0053] Washer 830

[0054] Support seat 900

[0055] Gear shaft 910 Detailed implementation manner

[0056] Next, a preferred embodiment is given and the accompanying drawings are used to more clearly and completely illustrate the present utility model.

[0057] As Figures 1-10 shown, this embodiment discloses a water pump. In this embodiment, the axial direction refers to the direction parallel to or coinciding with the axis of the main shaft 100, and the radial direction refers to the direction parallel to or coinciding with the radial direction of the main shaft 100. Among them, as Figures 1-5As shown in the figure, 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 moves axially within a limited distance. The main shaft 100 is rotatably arranged. The water pump further includes a first restoring member 710, a second restoring member 720, a gear assembly 400, a relatively stationary guiding member 500, a top block 300, and an expanding 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 expanding member 600 is connected to the outer surface of the main shaft 100, and the expanding member 600 squeezes into or out of the inner side of the rotor 200 as the main shaft 100 moves; the first gear member 410 cooperates with the main shaft 100 and rotates together, and the end of the main shaft 100 passes through the first gear member 410; the second gear member 420 cooperates with the top block 300 and restricts relative movement along the axial direction to each other, and does not restrict relative movement along the axial direction; the guiding member 500 is arranged to guide the top block 300 axially to contact the end position of the main shaft 100 during a certain rotation distance during the rotation of the top block 300, axially guide the top block 300 to move away from the end of the main shaft 100 during a certain rotation distance, and maintain the position of squeezing the second restoring member 720 during a certain rotation distance; the first restoring member 710 acts on the main shaft 100 and provides a restoring force towards the top block 300, and the second restoring member 720 acts on the top block 300 and provides a restoring force towards the main shaft 100.

[0058] The first restoring member 710 and the second restoring member 720 in this embodiment can be springs, conical springs, or other components with elastic restoring functions. The first restoring member 710 can directly contact the main shaft 100 for restoration, or can indirectly act on the main shaft 100 through other components. The second restoring member 720 can directly contact the top block 300 for energy storage and restoration, or can indirectly act on the top block 300 through other components. The relatively stationary guiding member 500 means that the guiding member remains stationary relative to other moving components of the water pump.

[0059] In this solution, the main shaft 100 is fixed under normal conditions of the water pump, and the rotor 200 rotates around the main shaft 100. When the sleeves of the main shaft 100 and the rotor 200 are abnormally adhered together, the rotation of the rotor 200 can drive 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. The second gear component 420 drives the top block 300 to rotate. The top block 300 first leaves the position where it presses the second restoring component 720 under the guidance of the guiding component 500. At this time, the second restoring component 720 quickly bounces up and activates the top block 300, and the guiding component 500 guides it to the end position where it contacts the main shaft 100. The top block 300 impacts the main shaft 100 to cause the main shaft 100 to move. The adhesion force between the main shaft 100 and the rotor 200 is destroyed, and the two are separated, releasing the stuck state due to adhesion. During this process, the main shaft 100 moves upward and drives the snap ring to move upward at the same time. The snap ring moves between the main shaft 100 and the rotor 200. Due to the presence of the snap ring, the main shaft 100 and the rotor 200 still cannot rotate relative to each other. The rotor 200 continues to rotate to drive the second restoring component 720 to drive the top block 300 to rotate, and the top block 300 then is guided to a position away from the end of the main shaft 100 until it moves to the position where the second restoring component 720 is pressed. At this time, under the pressure of the first restoring component 710, the main shaft 100 moves down to its original position. In this way, the stuck repair is achieved. Thus, the automatic release of the adhesion between the main shaft 100 and the rotor 200 of the water pump is realized. The recoverable shaft sleeve and the expansion component 600 can also handle the occurrence of the next adhesion to achieve repeated use.

[0060] As Figure 2 shown, in a further preferred embodiment, the water pump further includes a shaft bracket 810. One end of the main shaft 100 away from the expansion component 600 is limited in the shaft bracket 810 and moves axially relative to the shaft bracket 810. Both ends of the first restoring component 710 respectively abut against the shaft bracket and the main shaft 100. The shaft bracket 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. The first restoring component 710 thus does not occupy other spaces either.

[0061] As Figure 3 and Figure 4 shown, in a preferred embodiment, a washer 830 is provided between the axial directions of the second gear component 420 and the rotor 200. The expansion component 600 is squeezed into the inner side of the rotor 200 or the inner side of the washer 830 as the main shaft 100 moves. The washer 830 can pre-squeeze the expansion component 600 to make it enter the rotor 200 more smoothly.

[0062] As Figure 3 and Figure 4As shown, in a preferred embodiment, the expansion member 600 is a snap ring formed on the main shaft 100, and the snap ring has a curved shape. The snap ring is easy to install and replace, and the curved shape facilitates extrusion into the rotor 200 and the washer 830.

[0063] As Figures 3-5 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 member 410. A meshing portion 421 of the second gear member 420 surrounds the outside of the planetary gear 430 and the first gear member 410 and meshes with the planetary gear 430. A driving portion 422 of the second gear member 420 extends toward the side away from the main shaft 100 and cooperates with the top block 300. Thus, 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. As Figure 3 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 lower space.

[0064] As Figure 5 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 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 can also be adopted.

[0065] As Figures 5-8 shown, in a preferred embodiment, the driving portion 422 includes a limiting edge extending along the axial direction, and the top block 300 has a convex edge 310 that cooperates with the limiting edge. The limiting edge can drive the convex edge 310 of the top block 300 to rotate together during rotation, and at the same time, the convex edge 310 of the top block 300 can also move axially relative to the limiting edge.

[0066] As Figures 3-8 shown, in a preferred embodiment, the inside of the top block 300 has a cavity. The outside of the top block 300 cooperates with the second gear member 420, and the inside of the cavity of the top block 300 cooperates with the guiding member 500. Thus, the second gear member 420, the top block 300, and the guiding member 500 are stacked in the radial direction, saving axial space.

[0067] As Figures 3-8As shown, in a preferred embodiment, the interior of the guiding member 500 has a cavity. The outer side of the guiding member 500 cooperates with the top block 300, and both ends of the second restoring member 720 are limited within the cavity of the guiding member 500 and the cavity of the top block 300. This enables the second restoring member 720 to be maintained in a stable position, without occupying space and without interfering with other moving components.

[0068] As Figures 6-8 shown, in a preferred embodiment, the guiding member 500 has a guiding groove, which includes a horizontally extending section 510, a vertically extending section 520, and a return section 530 that are circularly connected. Among them, the horizontally extending section 510 is located on the side away from the main shaft 100, and the vertically extending section 520 extends along the axial direction. Among them, the vertically extending section 520 guides the top block 300 along the axial direction to contact the end position of the main shaft 100 within a certain rotational distance, and the return section 530 guides the top block 300 along the axial direction to move away from the end of the main shaft 100 within a certain rotational distance. The horizontally extending section 510 maintains a position where it presses against the second restoring member 720 within a certain rotational distance.

[0069] As Figures 6-8 shown, in a further preferred embodiment, a clamping groove 540 is formed on the side of the horizontally extending section 510 facing the main shaft 100. The restoring force of the second restoring member 720 can push the top block 300 into the clamping groove 540, so that when in an unjammed state, the top block 300 can be more stably limited in the horizontally extending section 510 and thus not be triggered to impact the main shaft 100.

[0070] As Figure 9 and Figure 3 、 Figure 4 shown, in a preferred embodiment, the water pump includes a support base 900 and a gear shaft 910. The gear shaft 910 cooperates with the planetary gear 430. The support base 900 remains stationary relative to other moving components.

[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 in other fields with a similar main shaft and rotor structure. The present 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 embodiments of the present utility model have been described above, those skilled in the art should understand that this is only for illustration purposes. The protection scope of the present utility model is defined by the appended claims. Without departing from the principles and essence of the present utility model, 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 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 moves axially within a limited distance, and the main shaft is rotatably arranged. The water pump further comprises a first return component, a second return component, a gear assembly, a relatively stationary guide component, a top block and an expansion component. The gear assembly comprises a first gear component and a second gear component that are directly or indirectly driven, wherein: The expansion component is connected to the outer surface of the main shaft, and the expansion component is squeezed into or squeezed out of the inner side of the rotor as the main shaft moves; The first gear component cooperates with the main shaft and rotates together, and the end of the main shaft passes through the first gear component; the second gear component cooperates with the top block and restricts relative movement around the axial direction, but does not restrict relative movement along the axial direction; The guide component is configured to guide the top block axially to an end position contacting the main shaft within a certain rotation distance during the rotation of the top block, guide the top block axially to a position away from the end of the main shaft within a certain rotation distance, and maintain a position of pressing the second restoring component within a certain rotation distance; The first restoring member acts on the main shaft and provides a restoring force toward the top block, and the second restoring member acts on the top block and provides a restoring force toward the main shaft.

2. The water pump according to claim 1, characterized in that, A washer is arranged between the second gear component and the rotor in the axial direction, and the expansion component is squeezed into the inner side of the rotor or the inner side of the washer as the main shaft moves.

3. The water pump according to claim 1, characterized in that, The expansion component is a clamping ring provided on the main shaft, and the clamping ring has a curved shape.

4. The water pump according to claim 1, characterized in that, The gear assembly also includes a planetary gear, which surrounds and meshes with the first gear component, an engaging portion of the second gear component surrounds the outer sides of the planetary gear and the first gear component and meshes with the planetary gear, and a driving portion of the second gear component extends toward a side away from the main shaft and cooperates with the top block.

5. The water pump according to claim 4, characterized in that, The driving part comprises a limiting edge extending along the axial direction, and the top block comprises a convex edge matched with the limiting edge.

6. The water pump according to claim 1, characterized in that, The top block has a cavity inside, the outer side of the top block cooperates with the second gear component, and the inner side of the cavity of the top block cooperates with the guide component.

7. The water pump according to claim 6, characterized in that, The guide component has a cavity inside, the outer side of the guide component cooperates with the top block, and the two ends of the second restoring component are confined in the cavity of the guide component and the cavity of the top block.

8. The water pump according to claim 1, wherein The guide component has a guide groove, which includes a horizontal section, a vertical section and a return section that are cyclically connected, wherein the horizontal section is located at a side away from the main axis, and the vertical section extends along the axial direction.

9. The water pump according to claim 8, wherein A clamping groove is formed on the side of the horizontal section facing the main shaft.

10. The water pump according to any one of claims 1-9, characterized in that, The water pump further comprises a shaft support, an end of the main shaft away from the expansion component is limited in the shaft support and moves relative to the shaft support along the axial direction, and two ends of the first restoring component respectively abut against the shaft support and the main shaft.

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