Water pump

Abstract

The utility model provides a water pump, which comprises a rotor, a rotating shaft, and shaft supports, a moving block, a top block and a guide part which are arranged at two ends of the rotating shaft, the rotor circumferentially moves relative to the rotating shaft by taking the rotating shaft as a center, and the rotating shaft rotates around the axial direction of the rotating shaft and moves along the axial direction of the rotating shaft; a space for the moving block and the top block to move in the axial direction of the rotating shaft is formed in the shaft support; the moving block is fixed relative to the circumferential direction of the rotating shaft and is movably arranged relative to the axial direction of the rotating shaft, the jacking block is fixed relative to the circumferential direction of the guide component and is movably arranged relative to the axial direction of the guide component, the moving block is spirally matched with the shaft support, and the jacking block is spirally matched with the moving block; the rotating direction between the moving blocks and the shaft supports is the same as that between the top blocks and the moving blocks, and the rotating directions of the moving blocks located at the two ends of the rotating shaft are the same. When the rotating shaft rotates forwards or reversely, the ejector blocks located at the different ends of the rotating shaft move towards the rotating shaft and collide with the rotating shaft. Forward rotation and reverse rotation are circulated, so that the water pump can be circulated for multiple times to automatically solve the jamming problem.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to a water pump. Background Art

[0002] With the continuous improvement of living standards, users have higher and higher requirements for bathing comfort and other water experience that gas water heaters can bring. The water pump in the gas water heater is an important component to ensure user experience. At present, the gas water heaters on the market mostly use DC brushless water pumps. Compared with traditional AC water pumps, DC brushless water pumps are smaller in size, longer in life, lower in noise, and can adjust the speed and signal feedback.

[0003] The internal structure of a brushless DC water pump can refer to Chinese patent CN218151448U. A water pump generally includes a rotor, a rotating shaft, a shaft support and a shaft bracket. The rotor is sleeved on the rotating shaft and can rotate around the rotating shaft. The shaft support and the shaft bracket are located at both ends of the rotating shaft. However, since the gap between the rotor and the rotating shaft is very small, fine sand or other impurities will adhere to the gap between the rotor and the rotating shaft after entering the pump body. If the water pump does not run for a long time, these impurities may become sticky and stick to the rotating shaft and the rotor after being soaked in water for a long time. If the starting torque of the water pump cannot break free from the bonding force, the water pump will fail to start and become stuck.

[0004] CN218151448U sets the shaft support and the rotating shaft as threaded connections, and opens an opening 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 rotate the shaft support, thereby driving the rotating shaft to produce axial displacement to separate the rotating shaft from the rotor. However, it is not possible to automatically solve the problem of stuckness, nor is it possible to automatically solve the problem of stuckness in multiple cycles. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a water pump in order to overcome the defect that the water pump in the prior art cannot automatically solve the stuck problem by circulating multiple times.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] A water pump comprises a rotor and a rotating shaft, wherein the rotor is sleeved on the rotating shaft and moves circumferentially relative to the rotating shaft with the rotating shaft as the center, and the rotating shaft is arranged to rotate around its axial direction and move within a limited distance along its axial direction;

[0008] The water pump further comprises a shaft support, a moving block, a top block and a guide component arranged at both ends of the rotating shaft, wherein a space is provided in the shaft support for the moving block and the top block to move along the axial direction of the rotating shaft, and the shaft support and the guide component are both fixedly arranged relative to the water pump;

[0009] The moving block is fixed relative to the circumference of the rotating shaft and is movably arranged relative to the axial direction of the rotating shaft, the top block is fixed relative to the circumference of the guiding component and is movably arranged relative to the axial direction of the guiding component, the moving block is screw-matched with the shaft support, and the top block is screw-matched with the moving block;

[0010] The rotation direction between the moving block and the shaft support is the same as the rotation direction between the top block and the moving block, and the rotation directions of the moving blocks located at both ends of the rotating shaft are the same;

[0011] When the rotating shaft rotates forward or reversely, the top blocks located at different ends of the rotating shaft move toward the rotating shaft and hit the rotating shaft.

[0012] In this scheme, when the rotating shaft and the rotor are bonded due to impurities, the rotating shaft rotates around its axial direction driven by the rotor, and the moving block fixed to the circumference of the rotating shaft rotates with the rotating shaft and moves along the axial direction of the rotating shaft. In the process of the moving block moving along the axial direction of the rotating shaft, the top block spirally matched with the moving block moves in the opposite direction driven by the moving block. The top block hits the rotating shaft during the movement process to cause the rotating shaft to be displaced in the axial direction, thereby destroying the bonding force between the rotating shaft and the rotor, and separating the rotating shaft from the rotor, thus avoiding the situation where the rotor and the rotating shaft are bonded and cause the water pump to be stuck. In addition, the bonding force between the rotor and the rotating shaft can be converted into an axial force along the rotating shaft after passing through the moving block and the top block in sequence, and then transmitted to the rotating shaft again. In other words, the separation of the rotor and the rotating shaft is automatically achieved by utilizing the bonding force between the rotating shaft and the rotor, without the need for maintenance personnel to operate from the outside.

[0013] At the same time, shaft supports, moving blocks, top blocks and guide components are arranged at both ends of the rotating shaft, and the rotating directions of the moving blocks at both ends are the same, and the rotating directions of the top blocks at both ends are the same, so that when the rotating shaft rotates, the moving directions of the moving blocks at both ends along the axial direction of the rotating shaft are the same, and the moving directions of the top blocks at both ends along the axial direction of the rotating shaft are also the same, so that when the rotating shaft rotates, the top block at one end moves toward the rotating shaft and hits the rotating shaft, and the top block at the other end moves in a direction away from the rotating shaft, and when the rotating shaft rotates forward and reverse, the top block moving toward the rotating shaft is different. That is to say, when the rotating shaft and the rotor are stuck, the rotating shaft can separate the two with the forward rotation of the rotor, and when the stuck occurs again, the rotating shaft can be driven to rotate in the reverse direction, and the top block at the other end is used to hit the rotating shaft to separate the two, and the forward and reverse cycles are repeated in this way, so that the pump can be circulated multiple times to automatically solve the stuck problem.

[0014] Preferably, the pitch of the helical structure between the moving block and the shaft support is smaller than the pitch of the helical structure between the moving block and the top block.

[0015] In this solution, the above-mentioned structural form is adopted, so that the moving speed of the top block is greater than the moving speed of the moving block, thereby increasing the impact force of the top block on the rotating shaft.

[0016] Preferably, the guide component has a columnar guide end extending toward the rotating shaft, the top block has a guide hole, the guide hole is sleeved on the guide end, and the shapes of the guide hole and the guide end are arranged to limit relative rotation.

[0017] In this solution, the shapes of the guide hole and the guide end are utilized to limit the rotation of the top block relative to the guide component, which helps to simplify the internal structure of the water pump and further helps to reduce the volume of the water pump.

[0018] Preferably, the water pump comprises a relatively fixed axial limiter, wherein the axial limiter is arranged at both ends of the rotating shaft, and the axial limiter is shared with the shaft support or shared with the guide component or arranged independently of each other.

[0019] In this solution, the axial limiter limits the movement range of the rotating shaft along its axial direction, so that the top block, the moving block and the rotating shaft can move within a limited distance, which can prevent the top block, the moving block and the rotating shaft from moving unrestrictedly and affecting the normal operation of the water pump.

[0020] Preferably, the moving block has a limiting hole, the limiting hole is sleeved on the rotating shaft, and the shapes of the rotating shaft and the limiting hole are arranged to achieve relative circumferential fixation.

[0021] In this solution, the shapes of the rotating shaft and the limiting hole are utilized to realize the relative circumferential fixation of the moving block and the rotating shaft, which is helpful to simplify the internal structure of the water pump and further help to reduce the volume of the water pump.

[0022] Preferably, the rotating shaft includes a limiting portion and a shaft body, the limiting portion is arranged at two ends of the shaft body and extends from the ends toward a direction away from the shaft body, the limiting hole is sleeved on the limiting portion, and the end of the limiting portion away from the shaft body is used for the top block to impact.

[0023] In this solution, the limiting part is arranged at the end of the shaft body, so that after the moving block cooperates with the limiting part, the end surface of the limiting part can be used as the action surface for the top block to impact, which is beneficial to improving the compactness and orderliness of the internal structure of the water pump.

[0024] Preferably, the shaft body and the limiting portion are coaxially arranged.

[0025] In this solution, the above-mentioned structural form is adopted, and the shaft body and the limiting part can rotate along their own axes. When the shaft body and the limiting part rotate, no movement will occur in the radial direction, which is beneficial to improving the transmission stability.

[0026] Preferably, the rotating shaft and the limiting hole are prismatic.

[0027] Preferably, the water pump further comprises a gasket, wherein the gasket is sleeved on the rotating shaft and applies a force along the radial direction of the rotating shaft to the rotating shaft.

[0028] In this solution, the gasket can provide certain support to the rotating shaft.

[0029] Preferably, the moving block is threadedly connected to the shaft support, and the top block is threadedly connected to the moving block.

[0030] The positive and progressive effects of the utility model are:

[0031] When the shaft and the rotor are bonded due to impurities, the shaft rotates around its axis driven by the rotor, and the moving block fixed to the shaft circumferentially rotates with the shaft and moves along the axis of the shaft. During the movement of the moving block along the axis of the shaft, the top block screwed with the moving block moves in the opposite direction driven by the moving block. During the movement, the top block hits the shaft to cause the shaft to be displaced in the axial direction, thereby destroying the bonding force between the shaft and the rotor, and separating the shaft from the rotor, thus avoiding the situation where the rotor and the shaft are bonded and the pump is stuck. In addition, the bonding force between the rotor and the shaft can be converted into an axial force along the shaft after passing through the moving block and the top block in turn and then transmitted to the shaft again. In other words, the separation of the rotor and the shaft is automatically achieved by utilizing the bonding force between the shaft and the rotor, without the need for maintenance personnel to operate from the outside.

[0032] At the same time, shaft supports, moving blocks, top blocks and guide components are arranged at both ends of the rotating shaft, and the rotating directions of the moving blocks at both ends are the same, and the rotating directions of the top blocks at both ends are the same, so that when the rotating shaft rotates, the moving directions of the moving blocks at both ends along the axial direction of the rotating shaft are the same, and the moving directions of the top blocks at both ends along the axial direction of the rotating shaft are also the same, so that when the rotating shaft rotates, the top block at one end moves toward the rotating shaft and hits the rotating shaft, and the top block at the other end moves in a direction away from the rotating shaft, and when the rotating shaft rotates forward and reverse, the top block moving toward the rotating shaft is different. That is to say, when the rotating shaft and the rotor are stuck, the rotating shaft can separate the two with the forward rotation of the rotor, and when the stuck occurs again, the rotating shaft can be driven to rotate in the reverse direction, and the top block at the other end is used to hit the rotating shaft to separate the two, and the forward and reverse cycles are repeated in this way, so that the pump can be circulated multiple times to automatically solve the stuck problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic cross-sectional structure diagram of the first limit state of the water pump of the preferred embodiment of the utility model.

[0034] Figure 2 for Figure 1 A partial enlarged view of the bottom end of the rotating shaft.

[0035] Figure 3 for Figure 1 A partial enlarged view of the top of the rotating shaft.

[0036] Figure 4 It is a schematic cross-sectional structure diagram of the second limit state of the water pump of the preferred embodiment of the utility model.

[0037] Figure 5 for Figure 4 A partial enlarged view of the bottom end of the rotating shaft.

[0038] Figure 6 for Figure 4 A partial enlarged view of the top of the rotating shaft.

[0039] Description of Reference Numerals

[0040] Water pump 100

[0041] Rotor 1

[0042] Reel 2

[0043] Limiting part 21

[0044] Axis body 22

[0045] Axis support 3

[0046] Move Block 4

[0047] Limit hole 41

[0048] Top block 5

[0049] Guide hole 51

[0050] Guide component 6

[0051] Lead end 61

[0052] Axial limiter 7

[0053] Gasket 8 DETAILED DESCRIPTION

[0054] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0055] like Figure 1-Figure 6As shown, this embodiment discloses a water pump 100, including a rotor 1 and a rotating shaft 2. The rotor 1 is sleeved on the rotating shaft 2 and performs circumferential motion relative to the rotating shaft 2 with the rotating shaft 2 as the center. The rotating shaft 2 is configured to rotate around its axial direction and move within a limited distance along its axial direction. The water pump 100 also includes a shaft support 3, a moving block 4, a top block 5 and a guide component 6 arranged at both ends of the rotating shaft 2. A space is provided in the shaft support 3 for the moving block 4 and the top block 5 to move along the axial direction of the rotating shaft 2. The shaft support 3 and the guide component 6 are both fixedly arranged relative to the water pump. The moving block 4 is fixed relative to the circumference of the rotating shaft 2 and is movably arranged relative to the axial direction of the rotating shaft 2, the top block 5 is fixed relative to the circumference of the guiding component 6 and is movably arranged relative to the axial direction of the guiding component 6, the moving block 4 is spirally matched with the shaft support 3, and the top block 5 is spirally matched with the moving block 4; the rotation direction between the moving block 4 and the shaft support 3 is the same as the rotation direction between the top block 5 and the moving block 4, and the rotation direction of the moving blocks 4 located at both ends of the rotating shaft 2 is the same; when the rotating shaft 2 rotates forward or reverse, the top blocks 5 located at different ends of the rotating shaft 2 move toward the rotating shaft 2 and hit the rotating shaft 2.

[0056] When the rotating shaft 2 and the rotor 1 are bonded due to impurities, the rotating shaft 2 rotates around its axial direction driven by the rotor 1, and the moving block 4 fixed to the rotating shaft 2 rotates with the rotating shaft 2 and moves along the axial direction of the rotating shaft 2. In the process of the moving block 4 moving along the axial direction of the rotating shaft 2, the top block 5 screwed with the moving block 4 moves in the opposite direction driven by the moving block 4. The top block 5 hits the rotating shaft 2 during the movement so that the rotating shaft 2 is displaced in the axial direction, thereby destroying the bonding force between the rotating shaft 2 and the rotor 1, and the rotating shaft 2 is separated from the rotor 1, thus avoiding the situation that the rotor 1 and the rotating shaft 2 are bonded and cause the water pump 100 to be stuck. In addition, the bonding force between the rotor 1 and the rotating shaft 2 can be converted into an axial force along the rotating shaft 2 after passing through the moving block 4 and the top block 5 in sequence and then transmitted to the rotating shaft 2 again. In other words, the separation of the rotor 1 and the rotating shaft 2 is automatically achieved by using the bonding force between the rotating shaft 2 and the rotor 1, without the need for maintenance personnel to operate from the outside.

[0057] At the same time, shaft supports 3, moving blocks 4, top blocks 5 and guide components 6 are provided at both ends of the rotating shaft 2, and the rotating blocks 4 at both ends have the same rotation direction, and the top blocks 5 at both ends have the same rotation direction, so that when the rotating shaft 2 rotates, the moving blocks 4 at both ends move in the same direction along the axial direction of the rotating shaft 2, and the top blocks 5 at both ends move in the same direction along the axial direction of the rotating shaft 2, so that when the rotating shaft 2 rotates, the top block 5 at one end moves toward the rotating shaft 2 and hits the rotating shaft 2, and the top block 5 at the other end moves in the direction away from the rotating shaft 2, and the top block 5 moving toward the rotating shaft 2 is different when the rotating shaft 2 rotates forward and reverse. That is to say, when the rotating shaft 2 and the rotor 1 are stuck, the rotating shaft 2 can separate the two with the forward rotation of the rotor 1, and when the stuck occurs again, the rotating shaft 2 can be driven to rotate in the reverse direction, and the top block 5 at the other end is used to hit the rotating shaft 2 to separate the two, and the forward and reverse cycles are repeated in this way, so that the water pump 100 can be circulated multiple times to automatically solve the stuck problem.

[0058] Preferably, the pitch of the spiral structure between the moving block 4 and the shaft support 3 is smaller than the pitch of the spiral structure between the moving block 4 and the top block 5, so that the moving speed of the top block 5 can be greater than the moving speed of the moving block 4, thereby increasing the impact force of the top block 5 on the rotating shaft 2.

[0059] The guide component 6 limits the top block 5 from rotating relative to the guide component 6 , so that the top block 5 can move axially relative to the rotating shaft 2 driven by the moving block 4 .

[0060] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the guide component 6 has a columnar guide end 61 extending toward the rotating shaft 2, and the top block 5 has a guide hole 51, and the guide hole 51 is sleeved on the guide end 61, and the shapes of the guide hole 51 and the guide end 61 are set to limit relative rotation. Using the shapes of the guide hole 51 and the guide end 61 to limit the rotation of the top block 5 relative to the guide component 6 is beneficial to simplifying the internal structure of the water pump 100, and further to reducing the volume of the water pump 100. Specifically, the shapes of the guide hole 51 and the guide end 61 can be prismatic, semicircular or any other shape that can limit relative rotation. In other embodiments, the relative non-rotation between the top block 5 and the guide component 6 can be achieved by other fastening structures.

[0061] like Figure 1 and Figure 4As shown, the water pump 100 includes a relatively fixed axial limiter 7, which is arranged at both ends of the rotating shaft 2. The axial limiter 7 limits the movement range of the rotating shaft 2 along its axial direction, so that the top block 5, the moving block 4 and the rotating shaft 2 can move within a limited distance, which can prevent the top block 5, the moving block 4 and the rotating shaft 2 from moving unrestricted and affecting the normal operation of the water pump 100. Among them, the axial limiter 7 can be formed by using the shaft support 3, can also be formed by using the guide component 6, or can be formed independently. Specifically, a baffle can be set at the end of the shaft support 3 or the guide component 6 facing away from the rotating shaft 2, and the baffle can be integrated with the shaft support 3 or the guide component 6, or an independent baffle can be set. Of course, the axial limiter 7, the shaft support 3 and the guide component 6 can be integrated.

[0062] like Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the moving block 4 has a limiting hole 41, and the limiting hole 41 is sleeved on the rotating shaft 2. The shapes of the rotating shaft 2 and the limiting hole 41 are set to achieve relative circumferential fixation. The relative circumferential fixation of the moving block 4 and the rotating shaft 2 is achieved by using the shapes of the rotating shaft 2 and the limiting hole 41, which is conducive to simplifying the internal structure of the water pump 100, and further conducive to reducing the volume of the water pump 100.

[0063] like Figure 1 and Figure 4 As shown, the rotating shaft 2 includes a limiting portion 21 and a shaft body 22. The limiting portion 21 is provided at both ends of the shaft body 22 and extends from the ends toward a direction away from the shaft body 22. The limiting hole 41 is sleeved on the limiting portion 21. The end of the limiting portion 21 away from the shaft body 22 is used for the top block 5 to hit. The limiting portion 21 is provided at the end of the shaft body 22, so that after the moving block 4 cooperates with the limiting portion 21, the end surface of the limiting portion 21 can be used as the action surface for the top block 5 to hit, which is conducive to improving the compactness and orderliness of the internal structure of the water pump 100.

[0064] The limiting portion 21 and the limiting hole 41 of the rotating shaft 2 may be in the shape of a prism, a semicircle or any other shape that can limit relative rotation. Of course, the entire shape of the rotating shaft 2 may also be the aforementioned shape.

[0065] The shaft body 22 and the limiting portion 21 are coaxially arranged, so that the shaft body 22 and the limiting portion 21 can rotate along their own axes. When the shaft body 22 and the limiting portion 21 rotate, they will not move in the radial direction, which is beneficial to improving transmission stability.

[0066] like Figure 1 and Figure 4 As shown, the water pump 100 further includes a gasket 8 , which is sleeved on the rotating shaft 2 and applies a radial force to the rotating shaft 2 , so that the gasket 8 can provide certain support to the rotating shaft 2 .

[0067] In this embodiment, the moving block 4 is threadedly connected to the shaft support 3, and the top block 5 is threadedly connected to the moving block 4. In other embodiments, the moving block 4 and the shaft support 3, and the top block 5 and the moving block 4 can be connected through spiral guide grooves and protrusions.

[0068] Figure 1 The relative position relationship between the moving block 4 and the top block 5 when they are in the first extreme position is shown. Figure 4 The relative position relationship between the moving block 4 and the top block 5 when they are at the second limit position is shown. Figure 1 Transformed into Figure 4 (i.e. by Figure 2 Transformed into Figure 5 ,Depend on Figure 3 Transformed into Figure 6 ). When the shaft 2 rotates in the reverse direction, the water pump 100 is Figure 4 Transformed into Figure 1 (i.e. by Figure 5 Transformed into Figure 2 ,Depend on Figure 6 Transformed into Figure 3 ).

[0069] The operation process of the water pump 100 is specifically as follows:

[0070] When the gap between the rotor 1 and the rotating shaft 2 is not bonded by impurities, the rotating shaft 2 does not rotate, and the rotor 1 moves circumferentially around the rotating shaft 2; when the rotor 1 and the rotating shaft 2 are bonded by impurities, the rotating shaft 2 rotates positively around its axis driven by the rotor 1, and the moving block 4 located at the first end of the rotating shaft 2 moves in a direction away from the rotating shaft 2 driven by the rotating shaft 2, and the top block 5 moves toward the rotating shaft 2 and hits the rotating shaft 2 driven by the moving block 4 to separate the rotor 1 from the rotating shaft 2, and the moving block 4 located at the second end of the rotating shaft 2 moves toward the rotating shaft 2 driven by the rotating shaft 2, and the top block 5 moves in a direction away from the rotating shaft 2 driven by the moving block 4 (that is, Figure 1 Transformed into Figure 4 ). After the rotor 1 and the rotating shaft 2 are separated, the rotating shaft 2 stops rotating and the water pump 100 operates normally.

[0071] When the rotor 1 and the rotating shaft 2 are bonded for the next time, the rotor 1 rotates in the opposite direction around its axis, and the moving block 4 at the second end of the rotating shaft 2 moves in the direction away from the rotating shaft 2 driven by the rotating shaft 2, and the top block 5 moves toward the rotating shaft 2 and hits the rotating shaft 2 driven by the moving block 4, so as to separate the rotor 1 from the rotating shaft 2, and the moving block 4 at the first end of the rotating shaft 2 moves toward the rotating shaft 2 driven by the rotating shaft 2, and the top block 5 moves in the direction away from the rotating shaft 2 driven by the moving block 4 (i.e., Figure 4 Transformed into Figure 1 ). After the rotor 1 and the rotating shaft 2 are separated, the rotating shaft 2 stops rotating and the water pump 100 operates normally.

[0072] When the next sticking occurs, the rotor 1 is rotated forwardly around its axis. In this way, the forward and reverse rotations are repeated repeatedly, and the water pump 100 can automatically solve the stuck problem by cycling for multiple times.

[0073] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A water pump, comprising a rotor and a rotating shaft, wherein the rotor is sleeved on the rotating shaft and moves circumferentially relative to the rotating shaft with the rotating shaft as the center, characterized in that: The rotating shaft is configured to rotate about its axial direction and move within a limited distance along its axial direction; The water pump further comprises a shaft support, a moving block, a top block and a guide component arranged at both ends of the rotating shaft, wherein a space is provided in the shaft support for the moving block and the top block to move along the axial direction of the rotating shaft, and the shaft support and the guide component are both fixedly arranged relative to the water pump; The moving block is fixed relative to the circumference of the rotating shaft and is movably arranged relative to the axial direction of the rotating shaft, the top block is fixed relative to the circumference of the guiding component and is movably arranged relative to the axial direction of the guiding component, the moving block is screw-matched with the shaft support, and the top block is screw-matched with the moving block; The rotation direction between the moving block and the shaft support is the same as the rotation direction between the top block and the moving block, and the rotation directions of the moving blocks located at both ends of the rotating shaft are the same; When the rotating shaft rotates forward or reversely, the top blocks located at different ends of the rotating shaft move toward the rotating shaft and hit the rotating shaft.

2. The water pump according to claim 1, characterized in that The pitch of the helical structure between the moving block and the shaft support is smaller than the pitch of the helical structure between the moving block and the top block.

3. The water pump according to claim 1, characterized in that: The guide component has a columnar guide end extending toward the rotating shaft, and the top block has a guide hole, which is sleeved on the guide end. The shapes of the guide hole and the guide end are configured to limit relative rotation.

4. The water pump according to claim 1, characterized in that The water pump comprises a relatively fixed axial limiter, wherein the axial limiter is arranged at both ends of the rotating shaft, and the axial limiter is shared with the shaft support or shared with the guide component or is arranged independently of each other.

5. The water pump according to claim 1, characterized in that: The moving block has a limiting hole, and the limiting hole is sleeved on the rotating shaft. The shapes of the rotating shaft and the limiting hole are arranged to achieve relative circumferential fixation.

6. The water pump according to claim 5, characterized in that The rotating shaft includes a limiting portion and a shaft body, the limiting portion is arranged at two ends of the shaft body and extends from the ends toward a direction away from the shaft body, the limiting hole is sleeved on the limiting portion, and one end of the limiting portion away from the shaft body is used for the top block to impact.

7. The water pump according to claim 6, characterized in that The shaft body and the limiting portion are coaxially arranged.

8. The water pump according to claim 5, characterized in that The rotating shaft and the limiting hole are prismatic.

9. The water pump according to claim 1, characterized in that: The water pump further comprises a gasket, which is sleeved on the rotating shaft and applies a force in the radial direction of the rotating shaft to the rotating shaft.

10. The water pump according to claim 1, characterized in that The moving block is threadedly connected to the shaft support, and the top block is threadedly connected to the moving block.

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