A water pump that avoids frequent motor startup when micro-flow is conducted

Abstract

The present invention relates to the technical field of power pumps, and particularly to a water pump with a function of preventing the motor from frequently starting when a micro-flow is conducted. The pump comprises a motor and a pump housing, wherein the pump housing is provided with a water inlet pipe, and a check valve is provided in a valve cavity channel within the water inlet pipe, wherein one end of the valve stem of the check valve is formed into a valve disc, and the other end of the valve stem is provided with a magnetic component; a sensor component is provided on the water inlet pipe, and the sensor component is used to detect the position of the magnetic component; a collar is provided between the valve seat and the valve body, and a valve disc is formed on the end of the valve stem facing the valve seat, and the side of the valve disc facing the valve seat is a sealing surface, and when the sealing surface is in contact with the inclined surface, the check valve is in a closed state; a first flow area and a second flow area are provided on the side wall of the valve cavity channel, and when the valve disc is in the first flow area, a gap is provided between the circumference of the valve disc and the first flow area, and a micro-flow cavity is formed in the gap.

Description

Technical Field

[0001] The present invention relates to the technical field of power pumps, and in particular to a water pump that can prevent a motor from frequently starting when a micro-flow is conducted. Background Art

[0002] After years of development, water pumps now have a wide variety of models and functions on the market. As an important component of the water supply and drainage system, water pumps are responsible for driving the flow of fluids. To prevent fluid backflow, water valves are usually installed inside the water pumps to block fluid backflow. With the development of the times, people have new requirements for automated and intelligent control. In order to more accurately and effectively control the fluid while reducing equipment losses, water pumps are usually equipped with sensors to monitor the working status of the valves at the time, thereby transmitting signals to other equipment and changing the working status of other equipment to make the water supply and drainage system operate more efficiently.

[0003] The check valve opens and closes automatically based on the pressure difference between the two ends of the fluid. It is also a water valve commonly used in water pumps to block the backflow of fluid.

[0004] The current technology has the following shortcomings:

[0005] 1. In actual use, it is common to encounter situations where users only need to use a small amount of fluid. When a check valve is installed in the water pump, due to the change in fluid pressure at both ends of the check valve, the check valve will be opened to balance the fluid pressure at both ends, and the valve will form a micro-flow conduction situation. However, since the sensor detects the opening of the valve, the sensing device will transmit a signal to the motor, causing the motor to increase pressure or shut down. For users using small amounts of water, there is no need for the motor to increase pressure; however, the check valve will still trigger the sensing device to operate the motor. In the case of small water flows, the dynamic adjustment of the check valve will occur more frequently, causing the motor to frequently start or stop, affecting the service life of the motor.

[0006] 2. When the check valve is opened or closed, the flow rate in the pipes at both ends of the valve body will change rapidly, resulting in a sudden increase in the pressure difference at both ends of the valve body. The inner side of the pump body and the sealing surface of the valve body are extremely susceptible to the impact of water hammer, and are prone to deformation or even damage, affecting the normal use of the equipment and reducing the service life of the water pump.

[0007] 3. Because the sensor accurately determines the check valve's operating status by sensing the position of the check valve stem, a magnetic component is typically attached to the rear end of the check valve stem. The magnetic field strength generated by the magnetic component varies with distance from the magnetic component. Sometimes, to ensure a more accurate sensor signal, the sensor element is placed inside the pipe. This makes sensor installation and subsequent maintenance difficult, and the sensor's long-term contact with the fluid significantly reduces its service life. Summary of the Invention

[0008] The purpose of the present invention is to provide a water pump that avoids frequent starting of the motor when micro-flow is conducted, improves the accuracy of the water pump during automation and intelligent control, reduces unnecessary signals transmitted by the sensor, thereby effectively protecting the motor and extending the service life of the motor.

[0009] The purpose of the invention is achieved in this way:

[0010] A water pump for preventing a motor from frequently starting when a micro-flow is conducted, comprising a motor and a pump housing, wherein a motor shaft extends from the motor, an impeller is provided on the motor shaft, and the impeller is placed in the pump housing;

[0011] The pump housing is provided with a water inlet pipe, which is used to connect to an external water source, and the fluid enters the interior of the pump housing through the water inlet pipe;

[0012] A check valve is provided in the valve cavity channel in the water inlet pipe, and the check valve includes a valve body, a valve seat and a valve stem, wherein the valve seat is connected to the valve body, and the valve stem is inserted into the valve body and can move within the valve body;

[0013] One end of the valve stem is formed into a valve disc, and the other end of the valve stem is provided with a magnetic component;

[0014] The water inlet pipe is provided with a sensor component, and the position of the sensor component corresponds to the position of the magnetic component;

[0015] A collar is provided between the valve seat and the valve body, and the collar is formed with an inclined portion;

[0016] A valve disc is formed on one end of the valve stem facing the valve seat, and a side of the valve disc facing the valve seat is a sealing surface. When the sealing surface is in contact with the inclined surface, the check valve is in a closed state.

[0017] The side wall of the valve cavity channel is provided with a first flow area and a second flow area;

[0018] The first circulation area is located at the front end of the valve cavity channel, and the second circulation area is connected to the rear side of the first circulation area;

[0019] When the valve flap is in the first circulation area, a gap is provided between the circumference of the valve flap and the first circulation area, and a microfluidic cavity is formed in the gap.

[0020] Preferably, the length of the first circulation area is 4 to 9 mm;

[0021] A convex ring portion is formed on the outer periphery of the valve disc, the convex ring portion protrudes from the edge of the valve disc by 0.1 to 0.5 mm, and the convex ring portion is arranged on the edge of the side surface of the valve disc facing away from the valve seat;

[0022] There is a gap of 0.3 to 1.2 mm between the circumference of the convex ring portion and the inner wall of the first flow area;

[0023] The inner diameter of the first flow area gradually decreases along the water flow direction, and the inclination angle of the inner wall of the valve body is no more than 3°.

[0024] Preferably, the magnetic component is a magnetic ring, the inner ring of the magnetic ring is one of the magnetic poles of the magnetic component, and the outer ring of the magnetic ring is the other magnetic pole of the magnetic component.

[0025] Preferably, a mounting groove is formed on the outer side of the water inlet pipe;

[0026] The sensor assembly includes

[0027] The housing has a slot formed thereon, a wire outlet hole 1 is formed at the bottom of the slot, and a raised portion is formed on the outer side of the housing;

[0028] a fixing plate capable of being placed in the slot and fixed in the slot;

[0029] a sensor element disposed on the fixing plate;

[0030] The water inlet pipe is formed with a mounting groove whose contour matches that of the sleeve, and the sleeve can be placed in the mounting groove.

[0031] Preferably, the fixing plate is formed with an assembly hole, the contour of the assembly hole matches the sensor element, so that the sensor element can be placed in the assembly hole.

[0032] Preferably, a limiting portion is formed in the slot, and the limiting portion is used to limit the position of the fixing plate in the slot, and the limiting portion does not block the first outlet hole;

[0033] A second wire outlet hole is formed on the fixing plate.

[0034] Preferably, the housing is formed with an end plate, and the end plate cannot be placed in the installation groove. When the housing is placed in the installation groove, the end plate will abut against the top of the installation groove;

[0035] A plurality of grooves are formed on the top of the installation groove.

[0036] Preferably, the pump housing is integrally formed, a chamber for accommodating fluid is formed inside the pump housing, and the water inlet pipe is in communication with the chamber inside the pump housing;

[0037] The chamber includes:

[0038] a water diversion cavity, one end of which is connected to the water inlet pipe, and the fluid enters the water diversion cavity through the water inlet pipe;

[0039] a static pressure chamber, which is in communication with the water diversion chamber, and the fluid in the water diversion chamber can flow into the static pressure chamber;

[0040] One end of the pump housing is further provided with a connection hole, which is used to connect to the motor so that the motor shaft of the motor and the impeller on the motor shaft can be placed inside the water diversion cavity;

[0041] A boss portion is formed in the water diversion cavity, and a groove is formed in the boss portion, and the groove is used to fix one end of the motor shaft;

[0042] When the impeller rotates, it can push the fluid in the water inlet chamber to flow and allow the fluid to enter the static pressure chamber.

[0043] Preferably, an expansion section is formed between the water diversion cavity and the static pressure cavity; a reinforcing rib is provided in the expansion section, and the reinforcing rib divides the diffuser into a first water outlet and a second water outlet;

[0044] The pump housing is further formed with a reduced pipe section, and the reduced pipe section is located between the water diversion cavity and the water inlet pipe.

[0045] Preferably, the static pressure chamber is connected to a pressure stabilizing tank, the pressure stabilizing tank comprises a shell and a rubber diaphragm, and the rubber diaphragm is placed in the shell;

[0046] The tank port of the pressure stabilizing tank is connected to the static pressure chamber;

[0047] The pump housing is further provided with a pressure relief port, which is provided with a pressure relief plug. When the pressure relief plug is removed, the fluid in the static pressure chamber can be discharged.

[0048] Preferably, the valve body is formed with a support ring portion, and the valve stem is inserted into the support ring portion.

[0049] A plurality of positioning ribs are formed on the valve stem, and the support ring portion is formed with limiting grooves having the same number as the positioning ribs. The positioning ribs cooperate with the limiting grooves to limit the displacement or rotation of the valve stem in the support ring portion.

[0050] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0051] 1. In this technical solution, the check valve is equipped with a micro-flow conduction structure. This allows the check valve to conduct flow across the valve body without being fully open, thereby quickly balancing the fluid pressure at both ends of the check valve. During this process, the check valve stem moves a small distance, making it less likely that the sensor element will misjudge, thereby reducing false starts of the motor and extending its service life.

[0052] 2. The micro-flow conduction structure can also slowly balance the pressure of the fluid at both ends of the valve body during the opening or closing process of the check valve, gradually reducing the flow of the fluid passing through the check valve, and avoiding excessive changes in the fluid flow to form water hammer and damage the pipeline or check valve.

[0053] 3. The magnetic component on the check valve is a magnetic ring. By changing the processing industry, the magnetic pole orientation of the magnetic ring has been changed. The two poles are no longer placed along the pipe. Instead, one pole is close to the inner wall of the pipe, and the other is away from the inner wall of the pipe. The two poles of the magnetic ring are placed on the inner and outer rings of the magnetic ring respectively. Because the magnetic flux lines are most concentrated at the ends of the magnetic poles, they can generate a greater magnetic field strength. Therefore, when the sensor element is placed outside the housing, it can be easily affected by the magnetic ring generated by the magnetic ring. The sensor component does not need to be placed on the inner wall of the pipe, which prevents the sensor component from long-term contact with the fluid.

[0054] 4. Since the sensor assembly can be set on the outside of the pipe, it is easier to assemble the sensor assembly, and there is no need to drill holes or perform other work on the pipe. Moreover, because the sensor assembly is set on the outer wall of the pipe, it is easier to disassemble and replace the sensor assembly later, which is convenient for later inspection and maintenance.

[0055] 5. In this technical solution, the sensor element is set in the housing. By forming a mounting groove on the pipe and placing the housing in the mounting groove, the sensor element can be quickly and conveniently installed on the outer wall of the pipe. The housing and the mounting groove form an interference fit, and the friction generated fixes the housing in the mounting groove. When disassembling, only sufficient force is required to complete the disassembly, which is convenient for future inspection and maintenance.

[0056] 6. The present technical solution adopts a pump casing that integrates the pump body and pump cover, which effectively improves the sealing of the water pump. Since there is no need to manufacture a pump body and pump cover that match each other, the one-piece pump body in the present technical solution reduces the difficulty in manufacturing, thereby facilitating the manufacture of the pump body; and the absence of a pump cover also reduces the links in the assembly process, thereby improving the efficiency of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a structural diagram of the present invention.

[0058] Figure 2 It is an exploded view of the present invention.

[0059] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0060] Figure 4 It is a cross-sectional view of the check valve of the present invention.

[0061] Figure 5 for Figure 4 Enlarged view of point B in the middle.

[0062] Figure 6 for Figure 4 Enlarged view of point C in the middle.

[0063] Figure 7 It is a cross-sectional view of the check valve of the present invention when it is in the micro-circulation stage.

[0064] Figure 8 It is a cross-sectional view of the check valve of the present invention when it is in a full flow stage.

[0065] Figure 9 It is a three-dimensional cross-sectional view of the check valve of the present invention.

[0066] Figure 10 It is a schematic diagram of the cooperation between the sensor component and the magnetic component of the present invention.

[0067] Figure 11 Schematic diagram of magnetic flux lines generated by the magnetic assembly of the present invention.

[0068] Figure 12 is a block diagram of the sensor assembly of this practical information.

[0069] Figure 13 is an exploded view of the sensor assembly of the present invention.

[0070] Figure 14 It is a cross-sectional view of the present invention.

[0071] Figure 15 for Figure 14 The cross-sectional view with AA as the section.

[0072] Figure 16 It is a cross-sectional view of the pump housing of the present invention.

[0073] Figure 17 It is a connection diagram of the motor shaft and the impeller of the present invention when they are placed in the pump casing.

[0074] Figure 18 for Figure 4 The cross-sectional view with section BB as the cross section.

[0075] Reference numerals: 1, pump housing; 11, water inlet pipe; 111, valve chamber channel; 12, mounting groove; 121, notch; 13, water diversion chamber; 131, boss portion; 132, groove; 133, pipe reduction section; 14, static pressure chamber; 15, water outlet interface; 16, pressure relief port; 161, pressure relief plug; 17, pressure stabilizing interface; 18, connecting hole; 19, pipe expansion section; 191, first water outlet; 192, second water outlet; 193, reinforcing rib;

[0076] 2. Electric motor; 21. Motor shaft; 22. Impeller;

[0077] 3. Check valve; 31. Valve body; 311. Support ring; 312. Limiting groove; 313. Clamping convex edge; 314. Clamping protrusion 1; 315. Second flow area; 316. First flow area;

[0078] 32. Valve seat; 321. Raised edge; 322. Second clamping protrusion;

[0079] 33. Valve stem; 331. Positioning rib;

[0080] 34. Valve disc; 341. Sealing surface; 342. Raised ring portion;

[0081] 35, collar; 351, inclined portion; 352, microfluidic cavity; 353, groove;

[0082] 4. Magnetic component; 41. Inner ring; 42. Outer ring; 43. Protective shell; 44. Magnetic flux lines;

[0083] 5. Sensor assembly; 51. Housing; 511. Slotted hole; 512. First outlet hole; 513. Positioning portion; 52. Fixing plate; 521. Assembly hole; 522. Second outlet hole; 53. End plate; 54. Raised portion; 55. Sensor element; 56. Ring groove;

[0084] 6. Gap;

[0085] 7. Surge tank; 71. Housing; 72. Rubber diaphragm; 73. Tank opening; 74. Connecting nozzle;

[0086] 8. Spring. DETAILED DESCRIPTION

[0087] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0088] Example 1:

[0089] like Figures 1-9 As shown, a water pump that avoids frequent motor startup when micro-flow is conducted includes a motor 2 and a pump housing 1. The motor 2 extends with a motor shaft 21, and the motor shaft 21 is provided with an impeller 22, which is placed in the pump housing 1.

[0090] The pump housing 1 is provided with a water inlet pipe 11 , which is used to be connected to an external water source. When the water inlet pipe 11 is connected, fluid can enter the interior of the pump housing 1 through the water inlet pipe 11 .

[0091] A check valve 3 is installed in the water inlet pipe 11. The check valve 3 includes a valve body 31, a valve seat 32, and a valve stem 33. The valve seat 32 and the valve body 31 are connected, and the valve stem 33 is inserted into the valve body 31 and can move within the valve body 31. The check valve 3 automatically opens or closes according to the fluid pressure at both ends. When the pressure of the fluid at one end of the check valve 3 is sufficient to overcome the fluid pressure at the other end of the check valve 3 and the resistance generated by the valve stem 33, the fluid with higher pressure at the end will push the valve stem 33, causing it to move within the valve body 31, thereby opening or closing the check valve 3 and preventing water from flowing back.

[0092] As a preferred embodiment, a spring 8 is sleeved on the outside of the valve stem 33, and the spring 8 is located between the support ring portion 311 and the valve disc 34. Since the valve body 31 is fixed in the valve cavity channel 111, the moving valve stem 33 drives the valve disc 34 to move, thereby changing the working state of the check valve 3. The spring 8 can provide sufficient reaction force to keep the valve disc 34 in the second flow area 315. By installing the spring 8, the check valve 3 can be quickly closed when the difference in fluid pressure at both ends of the valve body 31 is less than the elastic force of the spring 8. The user can thus set the pressure threshold for opening the check valve 3, and the rapid closing of the check valve 3 also reduces the time that the magnetic component 4 is in the transition position, making it easier for the sensor component 5 to accurately determine the current working state of the check valve 3 and transmit an accurate signal.

[0093] In the present technical solution, for the sake of convenience of explanation, the front end of the valve chamber channel 111 is set here according to the direction of water flowing through the check valve 3, that is, the front end of the valve chamber channel 111 is the inlet end of the check valve 3, and the rear end of the valve chamber channel 111 is the outlet end of the check valve 3.

[0094] In real life, people don't often use large amounts of water; they might only use a small amount at a time. Many people are more frugal with their water use habits, and might choose to open the faucet multiple times, using only a small amount of water each time. However, in the pipeline, as the amount of water at the rear end of the valve cavity channel 111 decreases, the water pressure also decreases. As a valve that opens and closes automatically based on a fluid pressure difference, the check valve 3 will be affected by the pressure difference and open, allowing the fluid at the front end of the valve cavity channel 111 to enter the rear end of the valve cavity channel 111.

[0095] As the check valve 3 opens, the sensor assembly 5 transmits a signal indicating that the check valve 3 is open, thereby driving the water pump motor 2. However, in reality, the user only draws a small amount of fluid, and the check valve 3 closes shortly after opening. The sensor assembly 5 then sends a closing signal, causing the motor 2 to stop.

[0096] Frequent opening and closing of the check valve 3 not only easily causes wear and tear on the paired motor 2, shortening the lifespan of the motor 2, but also frequently causes blockage in the valve chamber passage 111. Large amounts of fluid can impact the check valve 3 and the pipeline, causing water hammer. This significantly reduces the lifespan of the check valve 3 and the motor 2, reducing economic efficiency.

[0097] One end of the valve stem 33 is formed into a valve disc 34. When the valve disc 34 approaches the valve seat 32, the check valve 3 closes. A magnetic assembly 4 is mounted on the other end of the valve stem 33. This magnetic assembly 4 generates a magnetic field, and the strength of the magnetic field varies with the distance from the magnetic assembly 4. Because the magnetic assembly 4 moves with the valve stem 33, the strength of the magnetic field can be used to determine the position of the magnetic assembly 4, and thus the position of the valve stem 33 of the check valve 3, determining whether the check valve 3 is open or closed.

[0098] The water inlet pipe 11 is provided with a sensor assembly 5. The position of the sensor assembly 5 corresponds to the position of the magnetic assembly 4. The sensor assembly 5 is used to sense the magnetic field strength, and judge the current state of the check valve 3 according to the change of the magnetic field strength, and transmit a signal to other devices.

[0099] As the fluid pressure difference between the two ends of the valve body 31 increases, the valve stem 33 will be pushed by the fluid pressure and move within the valve body 31. When the valve stem 33 moves within the valve cavity channel 111, the magnetic component 4 will move with the valve stem 33; and during the movement of the magnetic component 4, the outer ring 42 of the magnetic component 4 will approach or move away from the sensor component 5. Since the magnetic field strength generated by the magnetic component 4 is determined by the number of magnetic flux lines 44, the farther away from the magnetic component 4, the fewer magnetic flux lines 44 will pass through the sensor component 5, and therefore the weaker the magnetic field strength acting on the sensor component 5. Therefore, by setting up an electronic component that can detect the magnetic field strength, people can simply and effectively determine the position of the valve stem 33 in the valve cavity channel 111, understand the current working status of the check valve 3, and send a corresponding signal to drive other equipment to work.

[0100] A collar 35 is provided between the valve seat 32 and the valve body 31 , and the collar 35 is formed with an inclined portion 351 .

[0101] according to Figure 4-9 As can be seen, two tube sections with different inner diameters are formed inside the valve body 31, namely the second flow area 315 and the first flow area 316. When the valve flap 34 is in the first flow area 316, a gap 6 is provided between the circumference of the valve flap 34 and the first flow area 316, forming a microfluidic cavity 352 in this gap 6.

[0102] When the valve flap 34 abuts the beveled portion 351, fluid flow is completely blocked, preventing it from passing through the check valve 3. As the check valve 3 gradually opens, the valve flap 34 and the beveled portion 351 separate, leaving a space between them for fluid to pass through. When the check valve 3 is not fully open, fluid first enters the microfluidic cavity 352, then flows from there into the gap 6 and reaches the rear end of the valve cavity channel 111.

[0103] When a portion of the fluid first passes through the check valve 3 from the front end of the valve cavity channel 111 through the gap 6, it can slow down the rate of increase in the fluid pressure at the front end of the valve cavity channel 111, preventing the pressure difference between the front end and the rear end of the valve cavity channel 111 from rapidly increasing. When the fluid pressure at the front end of the valve cavity channel 111 is able to push the valve stem 33 to move, the fluid pressure at the front end of the valve cavity channel 111 is slightly greater than the fluid pressure at the rear end of the valve cavity channel 111 and overcomes the resistance caused by the valve stem 33 and the spring 8 thereon. At this time, allowing a small amount of fluid at the front end of the valve cavity channel 111 to pass through the check valve 3 first can slow down the rate of increase in the fluid pressure at the front end of the valve cavity channel 111, thereby slowing down the opening speed of the check valve 3 and preventing the pressure difference between the fluids on both sides of the check valve 3 from increasing too quickly.

[0104] Because the surface of the inclined portion 351 is not parallel to the surface of the valve disc 34, the space between the valve disc 34 and the inclined portion 351 gradually increases during the gradual opening of the check valve 3. Therefore, more fluid will pass through the front end of the valve cavity channel 111, further reducing the pressure difference between the rear end of the valve cavity channel 111 and the rear end of the valve cavity channel 111.

[0105] When the check valve 3 is closed, the fluid pressure difference between the front end and the rear end of the valve cavity channel 111 is small at this time, and the fluid flow speed inside the valve cavity channel 111 is also low. The pressure between the front end and the rear end of the valve cavity channel 111 can be balanced only by the gap 6, thereby avoiding excessive water shock, protecting the pipeline and the check valve 3, and extending the service life of the product.

[0106] In this technical solution, during the closing process, the check valve 3 will go through four stages: full conduction, partial conduction, micro-flow conduction and full closure, thereby slowly and steadily reducing the pressure difference of the fluid on both sides of the check valve 3.

[0107] 1. Closing stage: When the valve disc 34 abuts against the inclined surface portion 351 , the check valve 3 is closed. At this time, no fluid can pass through the check valve 3 .

[0108] 2. Micro-circulation stage: Figure 7 As shown, when the fluid pressure at the front end of the valve cavity channel 111 is higher than the fluid pressure at the rear end of the valve cavity channel 111, the fluid with the higher pressure pushes the valve disc 34 to move. At this time, the protruding ring portion 342 separates from the inclined portion 351, and the fluid enters the interior of the microfluidic chamber 5 through the space formed between the protruding ring portion 342 and the inclined portion 351. At this time, the fluid can pass through the check valve 3 via the gap 6, so that the two ends of the check valve 3 remain conductive. However, because the fluid at the front end of the valve cavity channel 111 partially passes through the gap 6 connected to the microfluidic chamber 5 and passes through the check valve 3, the fluid at the front end of the valve cavity channel 111 is reduced, thereby reducing the fluid pressure on the front end of the valve cavity channel 111.

[0109] 3. Incomplete flow stage: After the valve disc 34 enters the second flow area 315, a larger space is created between the valve disc 34 and the valve body 31 for water to flow through. As the valve stem 33 moves, the valve disc 34 continues to move toward the second flow area 315, and the space between the valve disc 34 and the valve body 31 gradually increases until all fluid passing through the front end of the valve cavity channel 111 can pass through the check valve 3 without being affected.

[0110] 4. Full circulation stage: Figure 8 and Figure 9As shown, at this time, the valve flap 34 of the check valve 3 is completely in the second circulation area 315 , and there is sufficient space between the valve flap 34 and the second circulation area 315 , so that a large amount of fluid can quickly pass through and flow out of the check valve 3 .

[0111] In the fully flowing state, the fluid in the rear end of the valve cavity channel 111 flows to the next link in the water supply and drainage system. However, when the next link in the water supply and drainage system stops discharging fluid, the fluid accumulates at the rear end of the valve cavity channel 111. As the pressure at the outlet of the check valve 3 increases to a certain level, the fluid at the rear end of the valve cavity channel 111 pushes the valve stem 33 to move, causing the check valve 3 to gradually close again.

[0112] In the above four stages, the check valve 3 can make the fluid pressure at the front end of the valve cavity channel 111 change more smoothly during the opening process, and the micro-circulation stage can better balance the pressure difference on both sides of the check valve 3 slowly and steadily, avoiding the pressure difference between the front and rear ends of the valve cavity channel 111 being too large and causing water hammer damage to the check valve 3 and the pipeline.

[0113] The side of the valve disc 34 facing the valve seat 32 is a sealing surface 341. When the sealing surface 341 is in contact with the inclined surface 351, the check valve 3 is in a closed state. At this time, a micro-flow cavity 352 is formed between the convex ring portion 342 and the inclined surface 351. The micro-flow cavity 352 is connected to the gap 6, and the gap 6 is used for allowing a micro-flow of fluid to flow through.

[0114] At the same time, the valve disc 34 protrudes toward the valve seat 32, giving the sealing surface 341 a certain inclination. The inclined sealing surface 341 guides the fluid toward the edge of the valve disc 34. As a result, when the check valve 3 is open, most of the fluid is directly introduced into the microfluidic chamber 5, rather than being accumulated at the fluid input end of the check valve 3. This relieves pressure at the fluid input end of the check valve 3, ensuring stable operation of the check valve 3 and extending the service life of the check valve 3.

[0115] like Figures 1-9 As shown, the length of the first flow area 316 is 4 to 9 mm, with a preferred length of 7 mm. When the pressure difference between the front and rear ends of the valve cavity channel 111 is small, the fluid at the front end of the valve cavity channel 111 has difficulty pushing the valve disc 34 out of the first flow area 316. At this time, the front and rear ends of the check valve 3 are in a micro-flow state. In this situation, because the valve stem 33 moves a small distance, the magnetic component 4 is also less susceptible to magnetic field fluctuations. Consequently, the magnetic field strength sensed by the sensor assembly 5 does not change significantly, making it less likely to generate an erroneous signal.

[0116] A convex ring portion 342 is formed on the outer periphery of the valve disc 34, and the convex ring portion 342 protrudes from the edge of the valve disc 34 by 0.1 to 0.5 mm. The convex ring portion 342 is arranged on the edge of the side surface of the valve disc 34 facing away from the valve seat 32, and there is a gap 6 with a width in the range of 0.3 to 1.2 mm between the convex ring portion 342 and the inner wall of the valve body 31.

[0117] Due to the provision of the raised ring portion 342, a gap 6 is formed between the circumference of the raised ring portion 342 and the first circulation area 316. This allows the diameter of the end of the valve flap 34 where the sealing surface 341 is located to be appropriately reduced, leaving ample space within the first circulation area 316. When the valve flap 34 abuts against the inclined surface portion 351, the inclined surface portion 351 is squeezed by the valve flap 34 and deforms, thereby tightly fitting against the valve flap 34 and improving sealing performance.

[0118] The inner diameter of the first circulation area 316 gradually decreases along the direction of water flow, and the inclination angle of the inner wall of the valve body 31 is no more than 3°. The inclined inner wall of the valve body 31 causes the gap 6 between the valve flap 34 and the valve body 31 to tend to decrease after the check valve 3 enters the micro-circulation state. As the valve flap 34 continues to move inward, the gap 6 gradually becomes smaller, causing the pressure on the sealing surface 341 of the valve flap 34 to rapidly increase. The rapid increase in fluid pressure enables the check valve 3 to overcome the elastic force of the spring 8 and other resistances, quickly passing the incomplete circulation stage, and thus being able to quickly switch from the micro-circulation state to the full circulation state.

[0119] like Figures 1-11 As shown, in this embodiment, the structure of the magnetic component 4 is a magnetic ring, the inner ring 41 of the magnetic ring is one of the magnetic poles of the magnetic component 4, and the outer ring 42 of the magnetic ring is the other magnetic pole of the magnetic component 4. For the convenience of subsequent description, it is assumed that in this embodiment, the outer ring 42 of the magnetic component 4 is the N pole, and the inner ring of the magnetic ring 41 is the S pole.

[0120] The magnetic component 4 is arranged in a protective shell 43, and the protective shell 43 is screwed to the valve stem 33. The protective shell 43 can separate the magnetic component 4 from the fluid in the valve cavity channel 111, and prevent impurities in the fluid in the valve cavity channel 111 from adhering to the magnetic component 4. The magnetic component 4 can also be screwed to the valve stem 33 more firmly, ensuring that the magnetic component 4 can maintain the same motion state as the valve stem 33. It avoids the displacement of the magnetic component 4 itself when the valve stem 33 does not move, and reduces the occurrence of erroneous signal transmission. At the same time, it can also fix the relative position of the magnetic component 4 inside the check valve 3. In the subsequent assembly process, it can ensure that the sensor component 5 used to detect the strength of the magnetic flux lines can correspond well to the magnetic component 4, so that the sensor component 5 improves the detection accuracy.

[0121] like Figures 1-14As shown, a mounting groove 12 is formed on the outer side of the water inlet pipe 11;

[0122] The sensor assembly 5 includes

[0123] The housing 51 has a slot 511 formed thereon, a wire outlet hole 512 formed at the bottom of the slot 511, and a protrusion 54 formed on the outer side of the housing 51;

[0124] A fixing plate 52 , which can be placed in the slot 511 , and the fixing plate 52 can be fixed in the slot 511 ;

[0125] a sensor element 55 disposed on the fixing plate 52;

[0126] After the sensor element 55 is disposed inside the slot 511 via the fixing plate 52 , the fixing plate 52 and the sensor element 55 can move together with the housing 51 .

[0127] An installation groove 12 with a contour matching that of the sleeve 51 is formed on the outer wall of the water inlet pipe 11. After aligning the sleeve 51 with the installation groove 12, the sleeve 51 can be placed into the installation groove 12 with just a little force, thereby achieving the installation of the sensor assembly 5 on the outer wall of the water inlet pipe 11.

[0128] Furthermore, the sleeve 51 is formed with an annular groove 56, and a rubber ring can be arranged in the annular groove 56. The friction between the sleeve 51 and the mounting groove 12 can be further increased by the rubber ring.

[0129] The fixing plate 52 also has a second cable outlet hole 522. When the sensor assembly 5 is assembled, the cable of the sensor element 55 can be extended through the second cable outlet hole 522. The first cable outlet hole 512 of the housing 51 is also used to pass the cable connected to the sensor element 55. The cooperation between the second cable outlet hole 522 and the first cable outlet hole 512 allows the cable of the sensor element 55 to extend outside the housing 51, ensuring that the signal of the sensor element 55 is transmitted to other devices.

[0130] like Figure 13 and Figure 14 As shown, the fixing plate 52 is formed with an assembly hole 521 , the contour of which matches the sensor element 55 , so that the sensor element 55 can be placed in the assembly hole 521 .

[0131] As a preferred embodiment, the fixing plate 52 can be made of a flexible material, such as rubber. Therefore, when the sensor element 55 is placed in the assembly hole 521, the sensor element 55 squeezes the assembly hole 521 and deforms. The elastic force generated by the deformation of the fixing plate 52 clamps and fixes the sensor element 55, so that the sensor element 55 is embedded in the fixing plate 52.

[0132] An interference fit is formed between the fixing plate 52 and the slot hole 511 . When the fixing plate 52 is placed in the slot hole 511 , the connection between the fixing plate 52 and the slot hole 511 can also be strengthened by means of the elastic force generated by the elastic deformation.

[0133] like Figure 13 and Figure 14 As shown, a limiting portion 513 is formed within the slot 511. The limiting portion 513 is used to limit the position of the fixing plate 52 within the slot 511, ensuring that when the housing 51 is placed in the mounting slot 12, the fixing plate 52 is restrained in a position relatively close to the outer wall of the water inlet pipe 11. This allows the sensor element 55 to be closer to the outer wall of the water inlet pipe 11, thereby facilitating the sensing of the magnetic field strength generated by the magnetic component 4 within the water inlet pipe 11, thereby detecting the operating status of the check valve 3 and improving the accuracy of the sensor element 55.

[0134] Furthermore, the limiting portion 513 protruding from the slot 511 does not block the first outlet hole 512 , so the cable connected to the sensor element 55 can still extend out of the slot 511 through the first outlet hole 512 , thereby ensuring stable signal transmission.

[0135] like Figure 3 As shown, the housing 51 is formed with an end plate 53, which cannot be placed in the mounting groove 12. When the housing 51 is placed in the mounting groove 12, the end plate 53 will abut against the top of the mounting groove 12. This can limit the length of the housing 51 extending into the mounting groove 12, preventing the housing 51 from extending too far into the mounting groove 12, making it inconvenient to remove the housing 51 from the mounting groove 12 later.

[0136] The top of the mounting slot 12 is formed with a plurality of hand-gripping grooves 121, with the openings of the hand-gripping grooves 121 facing the top of the mounting slot 12. When the end plate 53 abuts against the top of the mounting slot 12, an empty space is left between the hand-gripping grooves 121 and the end plate 53, making it easy for maintenance personnel to apply force to the end plate 53 abutting against the top of the mounting slot 12, thereby driving the housing 51 to separate from the mounting slot 12 through the end plate 53.

[0137] like Figures 1-15 As shown, the pump housing 1 is integrally formed, a chamber for accommodating fluid is formed inside the pump housing 1, and the water inlet pipe 11 is connected to the chamber inside the pump housing 1;

[0138] The chamber includes:

[0139] The water diversion chamber 13 has one end connected to the water inlet pipe 11, and the fluid enters the water diversion chamber 13 through the water inlet pipe 11;

[0140] The static pressure chamber 14 is connected to the water diversion chamber 13. The fluid in the water diversion chamber 13 can enter the static pressure chamber 14. The top of the static pressure chamber 14 is provided with a water outlet port 15. The fluid with high static pressure energy in the static pressure chamber 14 can be delivered to other equipment through the water outlet port 15.

[0141] One end of the pump housing 1 also has a connection hole 18 for connecting to the motor 2, allowing the motor shaft 21 of the motor 2 and the impeller 22 on the motor shaft 21 to be placed within the water diversion chamber 13. Once the impeller 22 is installed within the water diversion chamber 13, when the motor 2 is started to rotate the motor shaft 21, the impeller 22 will begin to rotate along with the motor shaft 21. The impeller 22 continuously performs work on the fluid within the water diversion chamber 13, pushing the fluid into the static pressure chamber 14. Once the fluid enters the static pressure chamber 14, the kinetic energy acquired by the fluid within the water diversion chamber 13 is gradually converted into the fluid's static pressure energy.

[0142] The pump housing 1 of this technical solution adopts an integrated design, which effectively improves the sealing performance of the pump housing 1. Furthermore, due to the integrated design, there is no need for a separate pump cover during manufacturing, and thus no need to process related connection structures, which reduces the manufacturing process. During assembly, there is no need to ensure the accurate connection and sealing between the pump cover and the pump body, which effectively reduces the number of assembly steps and improves assembly efficiency.

[0143] A boss 131 is formed within the water diversion chamber 13. When the motor shaft 21 and the impeller 22 attached thereto are placed within the water diversion chamber 13, the end of the motor shaft 21 extending beyond the impeller 22 rests within the groove 132. A bearing is provided on this end of the motor shaft 21, allowing the motor shaft 21 to rotate within the groove 132, with one side of the impeller 22 positioned adjacent to the boss 131. The boss 131 also creates a curved waterway within the water diversion chamber 13. Rotating impeller 22 propels fluid along the curved waterway. When the fluid, pushed by impeller 22, reaches the end of the waterway, it is blocked by the boss 131 and enters the static pressure chamber 14.

[0144] like Figures 1-16 As shown, an expansion section 19 is formed between the water diversion chamber 13 and the static pressure chamber 14. The pipe diameter at the expansion section 19 gradually expands. When the fluid in the water diversion chamber 13 enters the expansion section 19, due to the expansion of the pipe diameter, according to the flow formula Q=Sv, it can be seen that the flow rate of the fluid will decrease when the flow rate remains unchanged, thereby realizing the conversion of the mechanical energy of the impeller 22 into the static pressure energy of the water.

[0145] Reinforcing ribs 193 are provided within the expanded section 19, dividing it into a first water outlet 191 and a second water outlet 192, thereby forming two flow channels with smaller cross-sectional areas within the expanded section 19. Because the fluid in the water diversion chamber 13 flows at a higher velocity and lower pressure, while the fluid in the expanded section 19 and the static pressure chamber 14 has a higher pressure, the centrifugal force generated by the impeller 22 hinders the rapid discharge of the fluid into the static pressure chamber 14. By providing reinforcing ribs 193, the expanded pipe section 19 is divided into two smaller cross-sectional areas: a first water outlet 191 and a second water outlet 192. The cross-sectional areas of the first and second water outlets 191, 192 are smaller than those of the expanded pipe section 19. This minimizes the pressure difference between the fluid in the first and second water outlets 191, 192 and the fluid pressure in the water diversion chamber 13. This facilitates the fluid in the water diversion chamber 13 to enter the first and second water outlets 191, 192 under the propulsion of the impeller 22. The fluid flow rate in the first and second water outlets 191, 192 also gradually decreases as the cross-sectional areas gradually increase. This ensures that the water pressure at the first and second water outlets 191, 192 is closer to the water pressure in the water diversion chamber 13, preventing backflow of liquid in the expanded pipe section 19 and the static pressure chamber 14, which could affect the normal operation of the water pump.

[0146] Furthermore, the cross-sectional area of ​​the inlet of the second water outlet 192 is smaller than the cross-sectional area of ​​the inlet of the first water outlet 191. Since the total amount of fluid that continues to be pushed by the impeller 22 decreases after the impeller 22 drives the fluid through the first water outlet 191, that is, the flow rate decreases, it is necessary to reduce the cross-sectional area of ​​the fluid passing through accordingly to maintain a lower pressure of the fluid, so that the remaining liquid can enter the second water outlet 192.

[0147] A reduced tube section 133 is also formed within the pump housing 1, located between the water diversion chamber 13 and the water inlet pipe 11. This reduced tube section 133 makes the diameter of the water channel within the water diversion chamber 13 smaller than that of the water inlet pipe 11, thereby reducing the volume of the water diversion chamber 13 and increasing the flow rate of the liquid entering the pump housing 1, resulting in a higher flow rate and lower pressure within the water diversion chamber 13. Furthermore, under the action of pressure, the higher-pressure fluid at the water inlet pipe 11 is more easily drawn into the water diversion chamber 13, improving the stability and efficiency of the pump.

[0148] like Figure 2 and Figure 14 As shown, the static pressure chamber 14 is formed with a pressure stabilizing interface 17, and is connected to the pressure stabilizing tank 7 through the pressure stabilizing interface 17. The pressure stabilizing tank 7 includes a shell 71 and a rubber diaphragm 72, and the rubber diaphragm 72 is placed in the shell 71. Under normal atmospheric pressure, the volume of the rubber diaphragm 72 is smaller than the volume of the shell 71.

[0149] The port 73 of the surge tank 7 is connected to the static pressure chamber 14 via a connecting nozzle 74, with a rubber diaphragm 72 fitted over one end of the connecting nozzle 74. When the static pressure chamber 14 is filled with fluid, excess fluid will flow through the connecting nozzle 74 into the rubber diaphragm 72, thereby limiting the amount of fluid remaining in the static pressure chamber 14 to a certain volume. Because the space within the static pressure chamber 14 is fixed, a continuous increase in the amount of fluid will cause the fluid pressure within the static pressure chamber 14 to continue to rise. Temporarily retaining excess fluid in the surge tank 7 effectively alleviates the fluid pressure within the static pressure chamber 14.

[0150] As more fluid enters the rubber diaphragm 72, its pressure also increases. When the fluid pressure reaches a certain level, the rubber diaphragm 72 deforms, further increasing the space within the rubber diaphragm 72 and reducing the fluid pressure. When more than a certain amount of fluid enters the static pressure chamber 14, the surge tank 7 maintains the fluid pressure within the static pressure chamber 14 through this process, preventing damage to the pump housing 1 due to excessive internal fluid pressure.

[0151] At the same time, when the pressure in the static pressure chamber 14 decreases, the rubber diaphragm 72 will also shrink, reducing the space inside the rubber diaphragm 72, thereby increasing the fluid pressure in the static pressure chamber 14, which can effectively avoid the backflow of the fluid and maintain the stable operation of the water pump.

[0152] The pump housing 1 also has a pressure relief port 16, which is equipped with a pressure relief plug 161. The pressure relief port 16 is located at the junction of the expanded pipe section 19 and the static pressure chamber 14, that is, at the bottom end of the static pressure chamber 14. When the fluid pressure in the static pressure chamber 14 needs to be quickly reduced or the static pressure chamber 14 needs to be emptied, the fluid in the static pressure chamber 14 can be quickly discharged by removing the pressure relief plug 161.

[0153] like Figure 4 、 Figure 9 and Figure 18 The valve body 31 is formed with a support ring portion 311, and the valve stem 33 is disposed within the support ring portion 311. The support ring portion 311 is used to fix the axial position of the valve stem 33, so that the valve stem 33 and the valve body 31 remain on the same axis or reduce the deviation of the valve stem 33, thereby preventing the check valve 3 from being unable to complete the closure due to the valve stem 33 deviating from the axis of the valve body 31.

[0154] Several positioning ribs 331 are formed on the valve stem 33, and the support ring portion 311 is formed with the same number of limiting grooves 312 as the positioning ribs 331. Through the cooperation between the positioning ribs 331 and the limiting grooves 312, the displacement or rotation of the valve stem 33 in the support ring portion 311 can be limited.

[0155] By providing the positioning rib 331 , the material used to manufacture the valve stem 33 can be effectively reduced, and the displacement of the valve stem 33 in the support ring 311 can be limited, so that the valve stem 33 and the valve body 31 are kept on the same axis.

[0156] The support ring portion 311 is formed with the same number of limiting grooves 312 as the positioning ribs 331. The limiting grooves 312 can limit the movement of the positioning ribs 331, thereby reducing the rotation of the valve stem 33 within the valve body 31. This reduces the contact between the valve stem 33 and the inclined surface 351 or the support ring portion 311 caused by the rotation of the valve stem 33, reduces the wear and tear of the components due to collision or friction, and prolongs the service life.

[0157] Example 2:

[0158] like Figure 4-Figure 9 As shown, as a preferred technical solution, the valve body 31 is formed with a clamping convex edge 313, and the ring 35 is formed with a groove 353 that matches the clamping convex edge 313. When the ring 35 is sleeved on the valve body 31, the clamping convex edge 313 will be placed in the groove 353 and fix the ring 35 to prevent the ring 35 from falling off.

[0159] A convex edge 321 is formed on the valve seat 32 at a position corresponding to the clamping convex edge 313 . The collar 35 can be clamped and fixed between the valve seat 32 and the valve body 31 through the cooperation between the clamping convex edge 313 and the convex edge 321 .

[0160] Furthermore, the collar 35 can be made of a flexible material such as rubber so as to be elastically deformable. When the valve seat 32 and the valve body 31 are connected, the convex edge 321 squeezes the collar 35. When the collar 35 is elastically deformed, the collar 35 fits on the valve body 31 to complete the clamping.

[0161] The flange 321 is positioned corresponding to the clamping flange 313, that is, the flange 321 is positioned at the bottom of the groove 353. The bottom of the groove 353 is the thinnest part of the collar 35. When the clamping flange 313 is fitted over the clamping flange 313, the flange 321 applies pressure to the collar 35 from the bottom of the clamping flange 313. Since the other side is restricted by the clamping flange 313, the collar 35 will collide with both sides, thereby being clamped between the valve seat 32 and the valve body 31.

[0162] Example 3:

[0163] like Figure 13 and Figure 14 As shown, as a preferred embodiment, a protrusion 54 is formed on the outer side of the sleeve 51 . The protrusion 54 has an inclined surface, and the inclined surface of the protrusion 54 faces the direction of the opening of the slot 511 .

[0164] When the sleeve 51 is placed into the mounting groove 12, the inclined surface of the protrusion 54 faces the interior of the mounting groove 12. As the sleeve 51 continues to move, the sleeve 51 comes into contact with the mounting groove 12, which squeezes the protrusion 54, causing the protrusion 54 to deform. The elastic force generated by the deformation of the protrusion 54 is converted into friction between the sleeve 51 and the mounting groove 12, further increasing the stability of the connection between the sleeve 51 and the mounting groove 12.

[0165] During the installation process, the inclined surface of the protrusion 54 is facing the inside of the installation groove 12. Therefore, when the protrusion 54 contacts the inner wall of the installation groove 12, it will be subjected to a force in the opposite direction, so that the inclined surface of the protrusion 54 has a larger area to fit against the inner wall of the installation groove 12, increasing the friction between the protrusion 54 and the installation groove 12.

[0166] Example 4:

[0167] like Figure 6 As shown, the valve body 31 is formed with a first snap-fit ​​protrusion 314 , and the valve seat 32 is formed with a second snap-fit ​​protrusion 322 , so that the valve body 31 and the valve seat 32 can be connected by snap-fitting, thereby facilitating the assembly of the check valve 3 .

[0168] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A water pump that prevents frequent motor startup when micro-flow is conducted, comprising a motor and a pump housing, wherein a motor shaft extends from the motor, an impeller is provided on the motor shaft, and the impeller is placed in the pump housing; The pump housing is provided with a water inlet pipe, which is used to connect to an external water source, and the fluid enters the pump housing through the water inlet pipe; A check valve is provided in the valve cavity channel in the water inlet pipe. The check valve comprises a valve body, a valve seat and a valve stem. The valve seat and the valve body are connected. The valve stem is passed through the valve body and can move within the valve body. The check valve is characterized by: One end of the valve stem is formed into a valve disc, and the other end of the valve stem is provided with a magnetic component; A sensor assembly is provided on the water inlet pipe, and the position of the sensor assembly corresponds to the position of the magnetic assembly; A collar is provided between the valve seat and the valve body, and the collar is formed with an inclined portion; A valve disc is formed on the end of the valve stem facing the valve seat. The side of the valve disc facing the valve seat is a sealing surface. When the sealing surface fits against the inclined surface, the check valve is in a closed state. The side wall of the valve cavity channel is provided with a first flow area and a second flow area; The first circulation area is located at the front end of the valve cavity channel, and the second circulation area is connected to the rear side of the first circulation area; When the valve disc is in the first flow area, a gap is provided between the circumference of the valve disc and the first flow area, and a microfluidic cavity is formed in the gap; The length of the first flow area is 4 to 9 mm; A convex ring portion is formed on the outer periphery of the valve disc, the convex ring portion protrudes from the edge of the valve disc by 0.1 to 0.5 mm, and the convex ring portion is arranged on the edge of the side surface of the valve disc facing away from the valve seat; There is a gap of 0.3 to 1.2 mm between the circumference of the convex ring portion and the inner wall of the first flow area; The inner diameter of the first flow area gradually decreases along the water flow direction, and the inclination angle of the inner wall of the valve body is no more than 3°; The pump casing is integrally formed, and a chamber for containing fluid is formed inside the pump casing, and the water inlet pipe is connected to the chamber inside the pump casing; The chamber includes: A water diversion chamber, one end of which is connected to a water inlet pipe, through which the fluid enters the water diversion chamber; The static pressure chamber is connected to the water diversion chamber, and the fluid in the water diversion chamber can flow into the static pressure chamber; A connection hole is also opened at one end of the pump housing, and the connection hole is used to connect with the motor so that the motor shaft and the impeller on the motor shaft can be placed inside the water diversion cavity; A boss portion is formed in the water diversion cavity, and a groove is formed in the boss portion, and the groove is used to fix one end of the motor shaft; When the impeller rotates, it can push the fluid in the water inlet chamber to flow and allow the fluid to enter the static pressure chamber.

2. A water pump for preventing frequent motor startup when micro-flow is conducted according to claim 1, characterized in that: The magnetic component is a magnetic ring, the inner ring of the magnetic ring is one of the magnetic poles of the magnetic component, and the outer ring of the magnetic ring is the other magnetic pole of the magnetic component.

3. A water pump for preventing frequent motor startup when micro-flow is conducted according to claim 2, characterized in that: The outer side of the water inlet pipe is protruded with a mounting groove; The sensor assembly includes: The housing has a slot formed on it, a wire outlet hole is formed at the bottom of the slot, and a convex portion is formed on the outer side of the housing; A fixing plate capable of being placed in the slot and fixed in the slot; a sensor element disposed on a fixed plate; An installation groove with a contour matching that of the sleeve is formed on the water inlet pipe, and the sleeve can be placed in the installation groove.

4. A water pump for preventing frequent motor startup when micro-flow is conducted according to claim 3, characterized in that: The fixing plate is formed with an assembly hole, the contour of which matches the sensor element so that the sensor element can be placed in the assembly hole; A limiting portion is formed in the slot, and the limiting portion is used to limit the position of the fixing plate in the slot, and the limiting portion does not block the outlet hole 1; A second wire outlet hole is formed on the fixing plate.

5. A water pump for preventing frequent motor startup when micro-flow is conducted according to claim 4, characterized in that: The housing is formed with an end plate, which cannot be placed in the installation slot. When the housing is placed in the installation slot, the end plate will rest against the top of the installation slot; A plurality of grooves are formed on the top of the installation groove.

6. The water pump for preventing frequent motor startup when micro-flow is conducted according to claim 1, characterized in that: An expanded pipe section is formed between the water diversion cavity and the static pressure cavity; a reinforcing rib is provided in the expanded pipe section, and the reinforcing rib divides the expanded pipe section into a first water outlet and a second water outlet; A reduced pipe section is also formed in the pump casing, and the reduced pipe section is located between the water inlet cavity and the water inlet pipe.

7. A water pump for preventing frequent motor startup when micro-flow is conducted according to claim 6, characterized in that: The static pressure chamber is connected to a pressure stabilizing tank, which includes a shell and a rubber diaphragm, and the rubber diaphragm is placed in the shell; The tank mouth of the pressure stabilizing tank is connected to the static pressure chamber; The pump housing is also provided with a pressure relief port, which is equipped with a pressure relief plug. When the pressure relief plug is removed, the fluid in the static pressure chamber can be discharged.

8. The water pump for avoiding frequent motor startup when micro-flow is conducted according to claim 1, characterized in that: The valve body is formed with a support ring portion, and the valve stem is inserted into the support ring portion; Several positioning ribs are formed on the valve stem, and the support ring is formed with the same number of limiting grooves as the positioning ribs. The positioning ribs and the limiting grooves cooperate to limit the displacement or rotation of the valve stem in the support ring.

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