A motor for a water pump and its control method

Abstract

The present invention discloses a motor for a water pump and its control method, relating to the technical field of motors for water pumps. It includes a housing, a motor installed outside the housing, an extension chamber communicated with the outer wall of the housing, and a water pump arranged at the bottom of the housing and driven by the motor. It further includes a first shaft rod fixedly connected to the output end of the motor in the housing, a main shaft rod coaxially connected to the impeller of the water pump, a first friction wheel sleeved on the first shaft rod, and a clutch structure that is in frictional contact with the friction surface of the first friction wheel and sleeved on the main shaft rod to adjust the speed change and stop of the impeller based on the water pressure rise and fall. A second friction wheel is sleeved at the output end of the first shaft rod close to the motor, and a speed change component is slidably arranged directly below the second friction wheel, and the speed change component is connected to the clutch structure through a transmission component. Through the present invention, the problem that the water inlet and outlet flow rates of the motor for the water pump are prone to be inconsistent due to external factors or improper operations in actual applications is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors for water pumps, and specifically to a motor for a water pump and its control method. Background Art

[0002] A motor for a water pump is a motor specifically designed to drive a water pump. Such motors are usually integrated with the water pump to form a compact and efficient water pump system. Their main function is to convert electrical energy into mechanical energy, thereby driving the impeller of the water pump to rotate, and then realizing the transportation or pressurization of liquid.

[0003] Although a driving motor for a water pump with the publication number CN117748836B can turn on the commutation mechanism while using the motor, and through the commutation mechanism, the coolant in a static state inside the cooling cavity can be converted into a flowing state, so that the coolant inside and outside circulates, to improve the cooling effect and thus extend the service life of the rotating shaft, in actual application, the motor for a water pump is easily affected by external factors or improper operations, resulting in inconsistent inflow and outflow rates:

[0004] The liquid outlet of the water pump is generally connected through pipes (mainly hoses) to form a channel to meet the usage requirements of different terrains and conditions. However, in actual application, the motor for a water pump is easily affected by external factors or improper operations, resulting in the external connecting hose being compressed, folded, etc. And since the power of the water pump remains constant and the water inflow per unit time is kept constant while the water outflow decreases, the water pressure inside the water pump and the pipeline system will gradually increase. If the staff fails to eliminate the adverse external factors affecting the hose in time, the continuously increasing water pressure will eventually break through some weak connection links and cause water spraying phenomena, such as the connection between the water pump and the hose, the crease of the hose, etc. Moreover, once the hose is folded, the water pressure will increase suddenly in a short time, and even before the staff can react, it will quickly break through the weak connection link and cause water spraying phenomena, and only the supervision and experience of the operators can be relied on to minimize the influence on the external pipeline to the greatest extent.

[0005] In view of the above problems, there is an urgent need to innovate and design on the basis of the original motor for a water pump. Summary of the Invention

[0006] The technical solution of the present invention aims at the technical problem that the existing technical solutions are too single, and provides a solution significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide a motor for a water pump and its control method to solve the problem that in actual application, the motor for a water pump is easily affected by external factors or improper operations and results in inconsistent inflow and outflow rates as mentioned in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solution: A motor for a water pump, comprising a housing, a motor installed outside the housing, an extension chamber communicating with the outer wall of the housing, and a water pump disposed at the bottom of the housing and driven by the motor. It further includes a first shaft rod fixedly connected to the output end of the motor within the housing, a main shaft rod coaxially connected to the impeller of the water pump, a first friction wheel sleeved on the first shaft rod, and a clutch structure sleeved on the main shaft rod and in frictional contact with the friction surface of the first friction wheel for adjusting the speed change and stopping of the impeller based on the water pressure lift. A second friction wheel is sleeved at the output end of the first shaft rod close to the motor, and a speed change assembly is slidably disposed directly below the second friction wheel, and the speed change assembly is connected to the clutch structure through a transmission assembly.

[0008] Preferably, the clutch structure includes a two-way flywheel sleeved on the main shaft rod and in contact with the first friction wheel, a connecting sleeve rotatably disposed at the bottom of the two-way flywheel, a connecting block fixedly connected to the outer wall of the connecting sleeve, and a pressure pipe communicating with the liquid outlet of the water pump through a pressure transmission pipe. A jacking rod is slidably disposed within the pressure pipe, and a piston is provided at one end of the jacking rod within the pressure pipe, and a return spring is connected to the top of the piston.

[0009] Preferably, a lever is sleeved on the top of the jacking rod and on one side of the connecting block. A rotating shaft is provided at the center of the lever, and one end of the rotating shaft is connected to the inner wall of the housing. A first spring is provided at the bottom of the connecting sleeve, and the first spring is sleeved on the main shaft rod, and the bottom of the first spring is connected to the inner wall of the bottom of the housing.

[0010] Preferably, the speed change assembly includes a guide rail fixed to the inner wall of the housing, a second shaft rod slidably disposed within the guide rail, and a speed change flywheel rotatably connected to the end of the second shaft rod through a bearing.

[0011] Preferably, the speed change flywheel is in contact with the second friction wheel, and a speed change transmission is formed between the speed change flywheel and the second friction wheel. The friction surface of the speed change flywheel is in contact with the bottom friction surface of the two-way flywheel to form a low-speed transmission.

[0012] Preferably, the transmission assembly includes a fixed sleeve sleeved on the second shaft rod, a first toothed plate fixedly connected to the fixed sleeve through a first connecting rod, a second toothed plate fixedly connected to the connecting sleeve through a second connecting rod, and a transmission gear with the end of the central shaft rod disposed within the extension chamber.

[0013] Preferably, a bearing is provided between the central shaft rod and the transmission gear for the transmission gear to be driven to rotate self - rotatably, and the transmission gear is respectively meshed with the first toothed plate and the second toothed plate. Limit blocks are provided at the teeth of the first toothed plate and the second toothed plate.

[0014] Preferably, one end of the axial rod placed in the extension bin is sleeved with a limiting slider, the bottom of the limiting slider is fixedly connected with a telescopic rod, and a second spring is sleeved on the telescopic rod.

[0015] Preferably, a driving slot is formed on the outer wall of the main shaft rod, and a driving block slidably matched with the driving slot is fixedly connected to the inner wall of the bidirectional flywheel.

[0016] A method for controlling a water pump motor comprises the following steps:

[0017] S1, deceleration stage: when the external connection hose of the water pump is compressed and folded, the water pressure inside the pressure pipe increases in a short time, causing the lever to rotate and drive the two-way flywheel to move downward, and drive the transmission gear to rotate through the second tooth plate, and the first tooth plate on the other side of the transmission gear drives the variable speed flywheel to move upward, causing the second friction wheel and the variable speed flywheel and the two-way flywheel to rotate at a reduced speed, thereby slowing down the water absorption rate of the impeller and realizing the deceleration rotation of the impeller;

[0018] S2, power clutch stage: when the speed reduction control in step S1 is not enough to solve the problem of continuous increase in water pressure, the static pressure in the water pump continues to increase, and the increased pressure causes the lifting rod to lift higher, making the tilt angle of the lever larger and the distance the two-way flywheel descends greater, so that the variable speed flywheel and the two-way flywheel move downward synchronously and release the contact with the second friction wheel to stop the impeller, thus realizing power clutch;

[0019] S3, power recovery phase:

[0020] S3-1: After the staff inspects the outlet of the water pump, the water flow is restored and the pressure in the pressure pipe is restored, so that the two-way flywheel moves upward and the variable speed flywheel contacts the second friction wheel first, thereby driving the two-way flywheel to rotate slowly first, and realizing the slow connection of the impeller power;

[0021] S3-2: As the two-way flywheel drives the second tooth plate to continue to rise, with the help of the transmission gear, the first tooth plate meshing with the transmission gear drives the speed-changing flywheel to move downward, thereby releasing the contact between the speed-changing flywheel and the second friction wheel. Then the two-way flywheel contacts the first friction wheel, so that the two-way flywheel and the water pump impeller driven by it rotate at a coaxial speed with the output end of the motor and return to normal working state.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. When the motor for the water pump is easily affected by external factors or improper operations during actual applications, resulting in the external connection hose being compressed or folded, the water pressure in the pressure transmission pipe will increase within a short period of time and squeeze the piston upward. As a result, the jacking rod connected to the piston rises and pushes the lever, and the rotation of the lever drives the two-way flywheel to move downward, and drives the transmission gear to rotate through the second toothed plate. The first toothed plate on the other side of the transmission gear drives the variable-speed flywheel to move upward, causing the second friction wheel, the variable-speed flywheel, and the two-way flywheel to form a speed-reducing rotation, thereby reducing the rotational suction rate of the impeller. Moreover, the reduction in flow rate can also extend the time for the water pressure to break through the weak link, thus leaving a certain inspection time for the staff.

[0024] 2. When the speed reduction control is insufficient to solve the problem of continuously increasing water pressure, at this time, the static pressure inside the water pump continues to increase. At this time, the excessive pressure pushes the water flow to jack up the piston higher. At this time, the inclination angle of the lever is even larger, and the distance that the two-way flywheel descends is more. And because there are limit blocks at the teeth of the first toothed plate and the second toothed plate, at this time, the teeth contact the limit block when engaging with the transmission gear, and drive the transmission gear to apply a negative pressure downward through the limit block. At this time, the central rod of the transmission gear drives the limiting slider to squeeze the telescopic rod and the second spring sleeved on the telescopic rod downward, so that the variable-speed flywheel and the two-way flywheel move downward synchronously and disengage from the second friction wheel, so that the impeller stops rotating, realizing power clutch. And the water pump that stops discharging water helps the staff to check the problems that occur in the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the motor for the water pump of the present invention.

[0026] Figure 2 It is a schematic diagram of another angle of the overall structure of the motor for the water pump of the present invention.

[0027] Figure 3 It is a schematic diagram of the initial operation state of the contact between the two-way flywheel and the first friction wheel in the internal structure of the motor for the water pump of the present invention.

[0028] Figure 4 It is a schematic diagram of the speed reduction state of the contact between the two-way flywheel and the variable-speed flywheel in the internal structure of the motor for the water pump of the present invention.

[0029] Figure 5 It is a schematic diagram of the disconnection state between the two-way flywheel and the first friction wheel in the internal structure of the motor for the water pump of the present invention.

[0030] Figure 6 It is a schematic diagram of another angle of the speed change state in the internal structure of the motor for the water pump of the present invention.

[0031] Figure 7 It is a schematic diagram of another angle of the normal state in the internal structure of the motor for the water pump of the present invention.

[0032] Figure 8 This is a side perspective view of the overall structure of the motor for the water pump of the present invention.

[0033] Figure 9 It is Figure 3 an enlarged view of the structure at position A.

[0034] Figure 10 It is Figure 4 an enlarged view of the structure at position B.

[0035] Figure 11 It is Figure 5 an enlarged view of the structure at position C.

[0036] In the figure: 1. housing; 101. extension chamber; 2. first shaft; 3. first friction wheel; 4. second friction wheel; 5. bidirectional flywheel; 6. connecting sleeve; 601. connecting block; 7. lever; 8. rotating shaft; 9. pressure pipe; 10. guide rail; 11. second shaft; 12. fixed sleeve; 13. jacking rod; 14. first toothed plate; 15. second toothed plate; 16. transmission gear; 17. telescopic rod; 18. pressure transmission pipe; 19. variable speed flywheel. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0038] Please refer to Figures 1 to 11 , the present invention provides a technical solution: a motor for a water pump, including a housing 1, a motor installed outside the housing 1, an extension chamber 101 communicated with the outer wall of the housing 1, and a water pump arranged at the bottom of the housing 1 and driven by the motor. It further includes a first shaft 2 fixedly connected to the output end of the motor in the housing 1, a main shaft coaxially connected to the water pump impeller, a first friction wheel 3 sleeved on the first shaft 2, a clutch structure that is in frictional contact with the friction surface of the first friction wheel 3 and is sleeved on the main shaft to adjust the speed change and stop of the impeller based on the water pressure lift. A second friction wheel 4 is sleeved at the output end of the first shaft 2 close to the motor. A speed change assembly is slidably arranged directly below the second friction wheel 4, and the speed change assembly is connected to the clutch structure through a transmission assembly.

[0039] The clutch structure includes a two-way flywheel 5 sleeved on the main shaft rod and in contact with the first friction wheel 3, a connecting sleeve 6 rotatably arranged at the bottom of the two-way flywheel 5, an engaging block 601 fixedly connected to the outer wall of the connecting sleeve 6, and a pressure pipe 9 communicated with the liquid outlet of the water pump through a pressure transmission pipe 18. A jacking rod 13 is slidably arranged in the pressure pipe 9, and a piston is arranged at one end of the jacking rod 13 located in the pressure pipe 9, and a return spring is connected to the top of the piston.

[0040] A lever 7 is sleeved on the top of the jacking rod 13 and on one side of the engaging block 601. A rotating shaft 8 is arranged at the center of the lever 7, and one end of the rotating shaft 8 is connected to the inner wall of the housing 1. A first spring is arranged at the bottom of the connecting sleeve 6, sleeved on the main shaft rod, and the bottom of the first spring is connected to the inner wall of the bottom of the housing 1.

[0041] The speed change assembly includes a guide rail 10 fixed to the inner wall of the housing 1, a second shaft rod 11 slidably arranged in the guide rail 10, and a speed change flywheel 19 rotatably connected to the end of the second shaft rod 11 through a bearing.

[0042] The speed change flywheel 19 is in contact with the second friction wheel 4, and a speed change transmission is formed between the speed change flywheel 19 and the second friction wheel 4. The friction surface of the speed change flywheel 19 is in contact with the bottom friction surface of the two-way flywheel 5 to form a low-speed transmission.

[0043] The transmission assembly includes a fixed sleeve 12 sleeved on the second shaft rod 11, a first toothed plate 14 fixedly connected to the fixed sleeve 12 through a first connecting rod, a second toothed plate 15 fixedly connected to the connecting sleeve 6 through a second connecting rod, and a transmission gear 16 with the end of the shaft rod arranged in the extension bin 101.

[0044] A bearing is arranged between the shaft rod and the transmission gear 16 for the transmission gear 16 to be driven to rotate. The transmission gear 16 is respectively meshed with the first toothed plate 14 and the second toothed plate 15, and limiting blocks are arranged at the teeth of the first toothed plate 14 and the second toothed plate 15.

[0045] A limiting slider is sleeved on one end of the shaft rod placed in the extension bin 101. The bottom of the limiting slider is fixedly connected with a telescopic rod 17, and a second spring is sleeved on the telescopic rod 17.

[0046] A driving chute is arranged on the outer wall of the main shaft rod, and a driving block slidably adapted to the driving chute is fixedly connected to the inner wall of the two-way flywheel 5.

[0047] A control method for a motor used in a water pump includes the following steps:

[0048] S1. Deceleration stage: When the external connecting hose of the water pump is compressed or folded, the water pressure inside the pressure pipe 9 increases rapidly in a short time, causing the lever 7 to rotate and drive the bi-directional flywheel 5 to move downward, and driving the transmission gear 16 to rotate through the second toothed plate 15. The first toothed plate 14 on the other side of the transmission gear 16 drives the variable-speed flywheel 19 to move upward, so that the second friction wheel 4, the variable-speed flywheel 19 and the bi-directional flywheel 5 form a speed-reducing rotation, thereby slowing down the water absorption rate of the impeller and realizing the decelerated rotation of the impeller;

[0049] S2. Power clutch stage: When the deceleration control in step S1 is insufficient to solve the problem of continuous increase in water pressure, the static pressure inside the water pump continues to increase at this time, and the increase in pressure causes the jacking rod 13 to jack up higher, making the inclination angle of the lever 7 larger and the downward movement distance of the bi-directional flywheel 5 more, so that the variable-speed flywheel 19 and the bi-directional flywheel 5 move downward synchronously and disengage from the second friction wheel 4 to stop the impeller, realizing the power clutch;

[0050] S3. Power recovery stage:

[0051] S3-1: After the staff repairs the liquid outlet of the water pump, the water flow resumes smoothly, the pressure in the pressure pipe 9 is restored, the bi-directional flywheel 5 moves upward and resets, and the variable-speed flywheel 19 first contacts the second friction wheel 4 to drive the bi-directional flywheel 5 to rotate slowly first, realizing the slow connection of the impeller power;

[0052] S3-2: As the bi-directional flywheel 5 drives the second toothed plate 15 to continue rising, with the transmission of the transmission gear 16, the first toothed plate 14 engaged with the transmission gear 16 drives the variable-speed flywheel 19 to move downward, thereby disengaging the variable-speed flywheel 19 from the second friction wheel 4. Immediately, the bi-directional flywheel 5 contacts the first friction wheel 3, so that the bi-directional flywheel 5 and the water pump impeller driven by it form a coaxial speed rotation with the output end of the motor and resume the normal working state.

[0053] Working principle: When using the motor for this water pump, first place the water pump in water and start the motor. After the motor starts, its output end synchronously drives the first shaft rod 2 to rotate. When the first shaft rod 2 rotates, it drives the first friction wheel 3 and the second friction wheel 4 sleeved on the first shaft rod 2 to rotate synchronously. The bi-directional flywheel 5 in contact with the friction surface of the first friction wheel 3 is driven by the frictional force to rotate, and when the bi-directional flywheel 5 rotates, it drives the main shaft rod to rotate. Since the bottom of the main shaft rod is connected to the impeller of the water pump, the main shaft rod drives the impeller to rotate while rotating and pumps and transports water;

[0054] When the motor used for the water pump is affected by external factors or improper operations during actual application, causing the external connection hose to be compressed or folded, the water pressure inside the pressure pipe 9 increases rapidly in a short time and squeezes the piston upward. As a result, the jacking rod 13 connected to the piston rises. While rising, the jacking rod 13 pushes one end of the lever 7. After being pushed, the lever 7 rotates around the rotating shaft 8, and its other end drives the connecting block 601 to move downward. While moving downward, the connecting block 601 makes the connecting sleeve 6 drive the two-way flywheel 5 to move downward synchronously, so that the two-way flywheel 5 disconnects from the first friction wheel 3. While the two-way flywheel 5 moves downward, the second toothed plate 15 fixedly connected to it through the second connecting rod moves downward and drives the transmission gear 16 to rotate. Then, the first toothed plate 14 engaged with the transmission gear 16 moves upward and drives the second shaft rod 11 to slide upward from the guide rail 10. The variable-speed flywheel 19 at the end of the second shaft rod 11 respectively contacts the bottom friction surfaces of the second friction wheel 4 and the two-way flywheel 5. Then, because the size of the second friction wheel 4 is smaller than that of the variable-speed flywheel 19, a low-speed transmission is formed between them. When the variable-speed flywheel 19 rotates slowly, it drives the two-way flywheel 5 to rotate at a low speed, thereby reducing the rotation and suction rate of the impeller, reducing the water flow velocity at the liquid outlet, reducing the dynamic pressure energy generated due to the increase in suction efficiency and flow velocity, and the reduction in flow velocity can also extend the time for the water pressure to break through the weak link, thus leaving a certain inspection time for the staff.

[0055] When the speed reduction control is not sufficient to solve the problem of continuously increasing water pressure, the static pressure inside the water pump continues to increase at this time. The excessive pressure at this time pushes the water flow to jack the piston higher. At this time, the inclination angle of the lever 7 is even larger, and the two-way flywheel 5 descends a greater distance. And because limit blocks are provided at the tooth positions of the first toothed plate 14 and the second toothed plate 15, when the teeth engage with the transmission gear 16 at this time, they contact the limit blocks, and drive the transmission gear 16 to apply a negative pressure downward through the limit blocks. At this time, the central rod of the transmission gear 16 drives the limiting slider to squeeze the telescopic rod 17 and the second spring sleeved on the telescopic rod 17 downward, so that the variable-speed flywheel 19 and the two-way flywheel 5 move downward synchronously and disconnect from the second friction wheel 4, so that the impeller stops rotating, and the water pump that stops discharging water helps the staff to check the problems that occur in the water pump.

[0056] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor for a water pump, comprising a housing (1), a motor mounted outside the housing (1), an extension chamber (101) connected to an outer wall of the housing (1), and a water pump arranged at the bottom of the housing (1) and driven by the motor, characterized in that: The invention also comprises a first shaft (2) arranged in the housing (1) and fixedly connected to the output end of the motor, a main shaft coaxially connected to the water pump impeller, a first friction wheel (3) sleeved on the first shaft (2), and a clutch structure in contact with the friction surface of the first friction wheel (3) and sleeved on the main shaft for adjusting the speed change and stop of the impeller based on the rise and fall of water pressure. A second friction wheel (4) is sleeved on the first shaft (2) near the output end of the motor, a speed change assembly is slidably arranged directly below the second friction wheel (4), and the speed change assembly is connected to the clutch structure through a transmission assembly. The clutch structure comprises a two-way flywheel (5) sleeved on the main shaft and in contact with the first friction wheel (3), a connecting sleeve (6) rotatably arranged at the bottom of the two-way flywheel (5), a connecting block (601) fixedly connected to the outer wall of the connecting sleeve (6), and a pressure pipe (9) connected to the liquid outlet of the water pump through a pressure transmission pipe (18), a lifting rod (13) is slidably arranged in the pressure pipe (9), and the lifting rod (13) is located at the pressure A piston is provided at one end of the tube (9), and a return spring is connected to the top of the piston. A lever (7) is sleeved on the top of the lifting rod (13) and one side of the connecting block (601). A rotating shaft (8) is provided at the center of the lever (7), and one end of the rotating shaft (8) is connected to the inner wall of the shell (1). A first spring is provided at the bottom of the connecting sleeve (6), and the first spring is sleeved on the main shaft rod. The bottom of the first spring is connected to the bottom inner wall of the shell (1). The speed change assembly comprises a guide rail (10) fixed to the inner wall of a housing (1), a second shaft (11) slidably arranged in the guide rail (10), and a speed change flywheel (19) rotatably connected to the end of the second shaft (11) via a bearing, the speed change flywheel (19) being in contact with the second friction wheel (4), and a speed change transmission is formed between the speed change flywheel (19) and the second friction wheel (4), and the friction surface of the speed change flywheel (19) is in contact with the bottom friction surface of the bidirectional flywheel (5) to form a low-speed transmission.

2. A water pump motor according to claim 1, characterized in that: The transmission assembly comprises a fixed sleeve (12) sleeved on the second shaft rod (11), a first tooth plate (14) fixedly connected to the fixed sleeve (12) via a first connecting rod, a second tooth plate (15) fixedly connected to the connecting sleeve (6) via a second connecting rod, and a transmission gear (16) at the end of the shaft rod disposed in the extension bin (101).

3. A water pump motor according to claim 2, characterized in that: A bearing is provided between the shaft rod and the transmission gear (16) so that the transmission gear (16) can be driven to rotate, and the transmission gear (16) is meshed with the first tooth plate (14) and the second tooth plate (15) respectively, and limit blocks are provided at the teeth of the first tooth plate (14) and the second tooth plate (15).

4. A water pump motor according to claim 2, characterized in that: One end of the axial rod placed in the extension bin (101) is sleeved with a limiting slider, the bottom of the limiting slider is fixedly connected to a telescopic rod (17), and a second spring is sleeved on the telescopic rod (17).

5. A water pump motor according to claim 1, characterized in that: The outer wall of the main shaft rod is provided with a driving slot, and the inner wall of the bidirectional flywheel (5) is fixedly connected with a driving block that is slidably matched with the driving slot.

6. A control method for a water pump motor, applicable to a water pump motor according to any one of claims 2 to 4, characterized in that: The control method comprises the following steps: S1, deceleration stage: when the external connection hose of the water pump is compressed and folded, the water pressure inside the pressure pipe (9) increases in a short time, causing the lever (7) to rotate and drive the bidirectional flywheel (5) to move downward, and driving the transmission gear (16) to rotate through the second tooth plate (15), and the first tooth plate (14) located on the other side of the transmission gear (16) drives the variable speed flywheel (19) to move upward, so that the second friction wheel (4) and the variable speed flywheel (19) and the bidirectional flywheel (5) form a deceleration rotation, thereby slowing down the water absorption rate of the impeller and realizing the deceleration rotation of the impeller; S2, power clutch stage: when the speed reduction control in step S1 is not enough to solve the problem of continuous increase in water pressure, the static pressure in the water pump continues to increase, and the increased pressure causes the lifting rod (13) to lift higher, making the tilt angle of the lever (7) larger and the distance the two-way flywheel (5) descends greater, so that the speed change flywheel (19) and the two-way flywheel (5) move downward synchronously and release the contact with the second friction wheel (4) to stop the impeller, thereby achieving power clutch; S3, power recovery phase: S3-1: After the staff inspects the outlet of the water pump, the water flow is restored and the pressure in the pressure pipe (9) is restored, so that the bidirectional flywheel (5) moves upward and the speed-changing flywheel (19) contacts the second friction wheel (4) first, thereby driving the bidirectional flywheel (5) to rotate slowly, thereby realizing the slow connection of the impeller power; S3-2: As the bidirectional flywheel (5) drives the second tooth plate (15) to continue to rise, the first tooth plate (14) meshing with the transmission gear (16) drives the speed change flywheel (19) to move downward, thereby releasing the contact between the speed change flywheel (19) and the second friction wheel (4). Then, the bidirectional flywheel (5) contacts the first friction wheel (3), so that the bidirectional flywheel (5) and the water pump impeller driven by the bidirectional flywheel (5) rotate at the same speed as the output end of the motor and resume normal working state.

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