Motor for water pump and control method thereof

Abstract

The invention discloses a motor for a water pump and a control method thereof, and relates to the technical field of motors for water pumps, comprising a shell, a motor mounted outside the shell, an extension bin communicated with the outer wall of the shell, and a water pump arranged at the bottom of the shell and driven by the motor, the first shaft rod is arranged in the shell and fixedly connected with the output end of the motor; the main shaft rod is coaxially connected with the water pump impeller; the first friction wheel sleeves the first shaft rod; the clutch structure is in contact with the friction surface of the first friction wheel, sleeves the main shaft rod and adjusts the speed change and rotation stop of the impeller based on water pressure lifting; a second friction wheel is arranged at the position, close to the output end of the motor, of the first shaft rod in a sleeving mode, and a speed changing assembly is arranged under the second friction wheel in a sliding mode and connected with the clutch structure through a transmission assembly. According to the invention, the problem that the motor for the water pump is easy to be influenced by external factors or improper operation in practical application, so that the water inlet and outlet flows are inconsistent is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of water pump motors, and in particular to a water pump motor and a control method thereof. Background Art

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

[0003] For example, a water pump drive motor with announcement number CN117748836B can turn on the commutation mechanism while using the motor, and the commutation mechanism can convert the coolant in the cooling chamber in a static state into a flowing state, so that the coolant inside and the coolant outside circulate to improve the cooling effect, thereby increasing the service life of the shaft. However, the water pump motor is easily affected by external factors or improper operation in actual application, resulting in inconsistent inflow and outflow of water:

[0004] The outlet of a water pump is generally connected through a pipe (mainly a hose) to form a channel to meet the use requirements of different terrains and conditions. However, the motor of the water pump is easily affected by external factors or improper operation in actual application, resulting in compression and folding of the external connecting hose, while the power of the water pump remains unchanged, the water intake per unit time remains constant, and the water output decreases, which will cause the water pressure in the water pump and the pipeline system to gradually increase. If the staff fails to eliminate the external adverse factors of the hose in time, the water pressure will continue to increase and will eventually break through some weak connection links to cause water spraying, such as the connection between the water pump and the hose, the fold of the hose, etc., and once the hose is folded, the water pressure will increase sharply in a short period of time, and even the staff will not have time to react and it will quickly break through the weak connection link to cause water spraying. The only way to avoid the impact of external pipelines to the greatest extent is to rely on the supervision and experience of the operating personnel.

[0005] In view of the above problems, it is urgent to carry out innovative design based on the original water pump motor. 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 that is significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide a motor for a water pump and a control method thereof, so as to solve the problem raised in the above background technology that the motor for a water pump is easily affected by external factors or improper operation in actual application, resulting in inconsistent inlet and outlet water flow rates.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a motor for a water pump, comprising a shell, a motor installed outside the shell, an extension chamber connected to the outer wall of the shell, and a water pump driven by the motor arranged at the bottom of the shell, and also comprising a first shaft rod arranged in the shell and fixedly connected to the output end of the motor, a main shaft rod coaxially connected to the water pump impeller, a first friction wheel sleeved on the first shaft rod, and a clutch structure that contacts the friction surface of the first friction wheel and is sleeved on the main shaft rod and adjusts the speed change and stop of the impeller based on the rise and fall of water pressure, wherein the first shaft rod is sleeved with a second friction wheel near the output end of the motor, a speed change assembly is slidably arranged 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 arranged at the bottom of the two-way flywheel, a connecting block fixedly connected to the outer wall of the connecting sleeve, and a pressure tube connected to the water outlet of the water pump through a pressure transmission tube, a lifting rod is slidably arranged in the pressure tube, and a piston is arranged at one end of the lifting rod located in the pressure tube, and a return spring is connected to the top of the piston.

[0009] Preferably, a lever is provided on the top of the lifting rod and 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 shell, and a first spring is provided at the bottom of the connecting sleeve, the first spring is sleeved on the main shaft rod, and the bottom of the first spring is connected to the bottom inner wall of the shell.

[0010] Preferably, the speed change assembly includes a guide rail fixed to the inner wall of the housing, a second shaft rod slidably disposed in 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-changing flywheel is in contact with the second friction wheel, and a speed-changing transmission is formed between the speed-changing flywheel and the second friction wheel, and the friction surface of the speed-changing flywheel is in contact with the bottom friction surface of the bidirectional flywheel to form a low-speed transmission.

[0012] Preferably, the transmission assembly includes a fixed sleeve mounted on the second shaft rod, a first tooth plate fixedly connected to the fixed sleeve via a first connecting rod, a second tooth plate fixedly connected to the connecting sleeve via a second connecting rod, and a transmission gear arranged at the end of the shaft rod in the extension bin.

[0013] Preferably, a bearing is provided between the shaft rod and the transmission gear so that the transmission gear is driven to rotate, and the transmission gear is respectively meshed with the first tooth plate and the second tooth plate, and limit blocks are provided at the teeth of the first tooth plate and the second tooth 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. In actual application, the motor for the water pump is easily affected by external factors or improper operation, which may cause the external connecting hose to be compressed or folded. The water pressure in the pressure transmission pipe will increase in a short time and squeeze the piston upward, so that the lifting rod connected to the piston rises and pushes the lever. The lever rotates to drive the two-way flywheel downward, and drives the transmission gear to rotate through the second tooth plate. The first tooth plate on the other side of the transmission gear drives the variable speed flywheel upward, so that the second friction wheel, the variable speed flywheel and the two-way flywheel rotate at a reduced speed, thereby reducing the rotational suction rate of the impeller. The reduction in flow rate can also extend the time it takes for the water pressure to break through the weak link, thereby leaving a certain amount of inspection time for the staff.

[0024] 2. When the speed reduction control is not enough to solve the problem of continuously increasing water pressure, the static pressure in the water pump continues to increase. At this time, the excessive pressure pushes the water flow to lift the piston higher. At this time, the inclination angle of the lever is larger, and the two-way flywheel drops a greater distance. Because limit blocks are set at the teeth of the first tooth plate and the second tooth plate, the teeth contact the limit blocks when meshing the transmission gear, and drive the transmission gear downward to apply negative pressure through the limit blocks. At this time, the axial rod of the transmission gear drives the limiting slider to squeeze the telescopic rod and the second spring mounted on the telescopic rod downward, so that the speed-changing flywheel and the two-way flywheel move downward synchronously and release the contact with 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 problem of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0027] Figure 3 It is a schematic diagram of the initial operating state of the internal structure of the water pump motor of the present invention, in which the bidirectional flywheel contacts the first friction wheel.

[0028] Figure 4 It is a schematic diagram of the deceleration state of the internal structure of the water pump motor of the present invention when the bidirectional flywheel is in contact with the variable speed flywheel.

[0029] Figure 5 It is a schematic diagram of the disconnected state of the bidirectional flywheel and the first friction wheel in the internal structure of the water pump motor of the present invention.

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

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

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

[0033] Fig. 9 for Figure 3 A magnified view of the structure at A.

[0034] Fig.10 for Figure 4 Enlarged view of the structure at B.

[0035] Fig.11 for Figure 5 Enlarged view of the structure at location C.

[0036] In the figure: 1, shell; 101, extension chamber; 2, first shaft; 3, first friction wheel; 4, second friction wheel; 5, two-way flywheel; 6, connecting sleeve; 601, connecting block; 7, lever; 8, rotating shaft; 9, pressure pipe; 10, guide rail; 11, second shaft; 12, fixing sleeve; 13, lifting rod; 14, first gear plate; 15, second gear plate; 16, transmission gear; 17, telescopic rod; 18, pressure transmission pipe; 19, speed-changing flywheel. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figures 1 to 11 The present invention provides a technical solution: a motor for a water pump, a housing 1, a motor installed outside the housing 1, an extension chamber 101 connected to the outer wall of the housing 1, and a water pump driven by the motor arranged at the bottom of the housing 1, and also includes 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 that contacts the friction surface of the first friction wheel 3 and is sleeved on the main shaft for adjusting the speed change and stop of the impeller based on the rise and fall of water pressure. The first shaft 2 is sleeved with a second friction wheel 4 near the output end of the motor, and 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 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 tube 9 connected to the liquid outlet of the water pump through a pressure transmission tube 18, a lifting rod 13 is slidably arranged in the pressure tube 9, and a piston is arranged at one end of the lifting rod 13 located in the pressure tube 9, and a return spring is connected to the top of the piston.

[0040] 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 arranged 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, and a first spring is arranged at the bottom of the connecting sleeve 6, the first spring is sleeved on the main shaft rod, and the bottom of the first spring is connected to the bottom inner wall of the shell 1.

[0041] The speed change assembly comprises a guide rail 10 fixed to the inner wall of the housing 1, a second shaft rod 11 slidably disposed 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-changing flywheel 19 contacts the second friction wheel 4 , and a speed-changing transmission is formed between the speed-changing flywheel 19 and the second friction wheel 4 , and the friction surface of the speed-changing flywheel 19 contacts the bottom friction surface of the bidirectional flywheel 5 to form a low-speed transmission.

[0043] The transmission assembly includes a fixed sleeve 12 mounted 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 arranged at the end of the shaft rod in the extension bin 101.

[0044] A bearing is provided between the shaft and the transmission gear 16 for driving the transmission gear 16 to rotate. The transmission gear 16 is meshed with the first tooth plate 14 and the second tooth plate 15 respectively. The teeth of the first tooth plate 14 and the second tooth plate 15 are both provided with limit blocks.

[0045] One end of the axial rod placed in the extension chamber 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.

[0046] 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 which is slidably matched with the driving slot.

[0047] A method for controlling a water pump motor comprises the following steps:

[0048] 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, so that the lever 7 rotates to drive the two-way flywheel 5 to move downward, and the transmission gear 16 is driven to rotate through the second toothed plate 15, and the first toothed plate 14 located on the other side of the transmission gear 16 drives the speed-changing flywheel 19 to move upward, so that the second friction wheel 4 and the speed-changing flywheel 19 and the two-way flywheel 5 form a deceleration rotation, thereby slowing down the water absorption rate of the impeller and realizing the deceleration rotation of the impeller;

[0049] 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 longer, so that the speed-changing 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, thus realizing power clutch;

[0050] S3, power recovery phase:

[0051] 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 two-way flywheel 5 moves upward and the speed-changing flywheel 19 contacts the second friction wheel 4 first, thereby driving the two-way flywheel 5 to rotate slowly first, and realizing the slow connection of the impeller power;

[0052] S3-2: As the two-way flywheel 5 drives the second tooth plate 15 to continue to rise, with the help of the transmission gear 16, the first tooth plate 14 meshing with the transmission gear 16 drives the speed-changing flywheel 19 to move downward, thereby releasing the contact between the speed-changing flywheel 19 and the second friction wheel 4. Then the two-way flywheel 5 contacts the first friction wheel 3, so that the two-way flywheel 5 and the water pump impeller driven by it rotate at a coaxial speed with the output end of the motor and resume normal working state.

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

[0054] When the water pump motor is affected by external factors or improper operation in actual application, causing the external connecting hose to be compressed and folded, the water pressure inside the pressure tube 9 increases in a short time and squeezes the piston upward, thereby causing the lifting rod 13 connected to the piston to rise. While rising, the lifting rod 13 pushes one end of the lever 7. After being pushed, the lever 7 rotates around the rotating shaft 8, and the other end drives the connecting block 601 to move downward. While the connecting block 601 moves downward, the connecting sleeve 6 synchronously drives the two-way flywheel 5 to move downward, thereby disconnecting the two-way flywheel 5 from the first friction wheel 3. While the two-way flywheel 5 moves downward, the second tooth plate 15 fixedly connected to it through the second connecting rod moves downward and drives the transmission gear. 16 rotates, and then the first tooth plate 14 meshing with the transmission gear 16 moves upward and drives the second shaft 11 to slide upward from the guide rail 10, and the speed-changing flywheel 19 at the end of the second shaft 11 contacts the bottom friction surfaces of the second friction wheel 4 and the two-way flywheel 5 respectively, and then the second friction wheel 4 forms a low-speed transmission with the speed-changing flywheel 19 because its size is smaller than that of the speed-changing flywheel 19, and the speed-changing flywheel 19 drives the two-way flywheel 5 to form a low-speed rotation when rotating slowly, thereby reducing the rotation suction rate of the impeller, reducing the water flow speed at the liquid outlet, reducing the dynamic pressure energy generated by the suction efficiency and the increase in flow speed, and the reduction in flow speed can also prolong the time for water pressure to break through the weak link, thereby leaving a certain amount of inspection time for the staff;

[0055] When the speed reduction control is not enough to solve the problem of continuously increasing water pressure, the static pressure in the water pump continues to increase. At this time, the excessive pressure pushes the water flow to lift the piston higher. At this time, the inclination angle of the lever 7 is larger, and the two-way flywheel 5 drops a greater distance. Because the teeth of the first tooth plate 14 and the second tooth plate 15 are provided with limit blocks, the teeth contact the limit blocks when meshing the transmission gear 16, and drive the transmission gear 16 to apply negative pressure downward through the limit blocks. At this time, the axial 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 speed change flywheel 19 and the two-way flywheel 5 move downward synchronously and release the contact with the second friction wheel 4, so that the impeller stops rotating. The water pump that stops discharging water helps the staff to check the problem of the water pump.

[0056] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should 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, wherein the first shaft (2) is sleeved with a second friction wheel (4) near the output end of the motor, and 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.

2. A water pump motor according to claim 1, characterized in that: The clutch structure comprises a bidirectional 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 bidirectional flywheel (5), a connecting block (601) fixedly connected to the outer wall of the connecting sleeve (6), and a pressure tube (9) connected to the liquid outlet of the water pump via a pressure transmission tube (18), a lifting rod (13) being slidably arranged in the pressure tube (9), a piston being arranged at one end of the lifting rod (13) located in the pressure tube (9), and a return spring being connected to the top of the piston.

3. A water pump motor according to claim 2, characterized in that: 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); 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); the first spring is sleeved on the main shaft rod; and the bottom of the first spring is connected to the bottom inner wall of the shell (1).

4. A water pump motor according to claim 3, characterized in that: The speed change assembly comprises a guide rail (10) fixed to the inner wall of a 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) via a bearing.

5. A water pump motor according to claim 4, characterized in that: The speed-changing flywheel (19) is in contact with the second friction wheel (4), and a speed-changing transmission is formed between the speed-changing flywheel (19) and the second friction wheel (4), and the friction surface of the speed-changing flywheel (19) is in contact with the bottom friction surface of the bidirectional flywheel (5) to form a low-speed transmission.

6. A water pump motor according to claim 4, 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).

7. A water pump motor according to claim 6, 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).

8. A water pump motor according to claim 6, 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).

9. A water pump motor according to claim 2, 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.

10. A control method for a water pump motor, applicable to a water pump motor according to any one of claims 6 to 8, 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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