Bidirectional displacement diaphragm pump

Abstract

The application discloses a bidirectional exhaust diaphragm pump, and belongs to the technical field of fluid conveying equipment. The pump comprises a pump body, a pump water assembly for conveying fluid, a first motor for driving the pump water assembly to work, and a work position limiting assembly. A flow passage is arranged in the pump body and communicates with the pump water assembly. The pump further comprises an electric reversing valve unit. The work position limiting assembly is arranged on the pump head body and electrically connected with the second motor, and is used for detecting and locking the rotating position of the rotating valve core assembly. The pump body is matched with the integrated electric reversing valve, so that the flow passage can be quickly switched online, cut off and kept pressure, and the pipeline can be reversely exhausted. The problems that the existing diaphragm pump cannot be bidirectionally conveyed, the external reversing valve structure is bulky, and the anti-backflow and exhaust functions are lacked are solved. The pump has the advantages of high integration, accurate reversing, reliable sealing, and wide adaptation scene.

Description

Technical Field

[0001] This invention relates to the field of fluid transport equipment technology, specifically a bidirectional suction and discharge diaphragm pump. Background Technology

[0002] Diaphragm pumps, as positive displacement pumps that utilize the reciprocating motion of a flexible diaphragm to achieve fluid intake and discharge, are widely used in chemical, environmental protection, water treatment, and industrial cleaning fields due to their advantages such as strong self-priming capability, ability to transport media containing particles, and no risk of leakage. Traditional diaphragm pumps typically use an eccentric mechanism driven by a motor to drive the diaphragm in reciprocating motion, and are equipped with inlet and outlet check valves to achieve unidirectional fluid transport.

[0003] Currently, there are two main solutions for switching the direction of fluid delivery: one is to connect a reversing valve group to the inlet and outlet pipelines of the pump and switch the pipeline connection relationship manually or by solenoid valve; the other is to adopt a bidirectional pump structure and change the direction of fluid delivery by changing the direction of motor rotation. However, in practical applications, the use of external directional valve assemblies results in a bulky pumping system and complex piping connections, increasing equipment costs and installation space, and introducing additional leakage risks due to the increased number of pipe joints. Secondly, for pumping systems using diaphragm pumps, the diaphragm pump relies on inlet and outlet check valves for directional fluid delivery; simply changing the motor rotation direction cannot change the fluid delivery direction. The presence of the check valves dictates that it can only deliver fluid in one direction, limiting its application in situations requiring bidirectional pumping. Existing pumping systems generally lack online shut-off and pressure-maintaining functions; when it is necessary to pause delivery or prevent backflow, an additional shut-off valve is often required. For situations requiring the evacuation of residual fluid from the pipeline, existing solutions cannot achieve reverse suction and evacuation through the pump itself; an external vacuum source or pipeline disassembly is required, which is cumbersome and inefficient. Furthermore, in some applications requiring alternating supply from multiple pipelines… In applications involving liquid or distributed fluid transport, existing diaphragm pumps can only connect to a single inlet / outlet pipeline. If fluid needs to be transported alternately to multiple pipelines, complex distribution valve assemblies must be added externally to the pump, further exacerbating the bloated nature of the system structure and the complexity of control. At the same time, the valve cores of existing reversing valves are mostly made of ordinary metal or plastic, and the sealing structure mostly relies on a single rubber O-ring. When transporting corrosive fluids, high-temperature fluids, or media containing abrasive particles, problems such as wear, corrosion, and sealing failure are prone to occur. The rubber O-rings also suffer from fatigue aging defects, resulting in short service life and high maintenance costs. Furthermore, existing diaphragm pumps generally lack integrated venting and pressure relief structures. After shutdown, the pipeline is under pressure for a long time, which can easily lead to aging of the seals and pipeline rupture. Traditional venting and pressure relief mostly rely on automatic opening and closing of water pressure and air pressure or external solenoid valves. The former has problems with delayed response and large flow loss, while the latter is costly and has low integration, which cannot meet the needs of integrated pumping systems.

[0004] Therefore, how to design a diaphragm pump that can achieve online switching of fluid delivery direction, has shut-off pressure holding and reverse venting functions, and can adapt to the needs of multi-pipeline distribution without adding an external reversing device has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The purpose of this invention is to provide a bidirectional suction and discharge diaphragm pump, which has the advantages of high integration, fast reversing response, pressure holding and reverse venting functions, and the ability to switch between multiple pipelines. It solves the problems of complex reversing structure, inability to switch flow direction online, and lack of anti-backflow and venting functions in the existing pumping system.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A bidirectional suction and discharge diaphragm pump includes a pump body, which is provided with a pumping assembly for conveying fluid, a first motor for driving the pumping assembly, and a station limiting assembly. The pump body has a flow passage communicating with the pumping assembly. The pump body is characterized by further including an electric reversing valve unit. The station limiting assembly is disposed on the pump head body and electrically connected to a second motor for detecting and locking the rotation position of the rotary valve core assembly. The electric reversing valve unit includes a pump head body, a rotary valve core assembly, and a second motor. The pump head body is integrally integrated with or sealed and fixedly connected to the pump body. The pump head body has at least one inlet and outlet port for connecting to an external pipeline. The pump head body has a valve chamber that communicates with the flow channel. The rotary valve core assembly is rotatably assembled in the valve chamber. The second motor is an independently set reversing drive motor. The second output shaft of the second motor is drivenly connected to the rotary valve core assembly to drive the rotary valve core assembly to rotate around its own axis in the valve chamber, so as to change the flow channel opening and closing state and fluid flow direction between the valve chamber and each inlet and outlet port.

[0007] The rotary valve core assembly has at least one working position as the second motor rotates, including: a forward water supply position, a shut-off pressure holding position, and a reverse venting position.

[0008] Preferably, the pump assembly is a diaphragm pump assembly, which includes an eccentric drive structure, a pressurizing diaphragm, a middle plate, a partition plate, an inlet unidirectional diaphragm, and an outlet unidirectional diaphragm. The first output shaft of the first motor is driven by the eccentric drive structure, which is fixedly connected to the pressurizing diaphragm. A pressurizing chamber is formed between the pressurizing diaphragm and the middle plate. The middle plate has a first inlet hole, a second inlet hole, a first outlet hole, and a second outlet hole. The inlet unidirectional diaphragm is located in the passage between the first inlet hole and the pressurizing chamber, and the outlet unidirectional diaphragm is located in the passage between the pressurizing chamber and the first outlet hole. The inlet unidirectional diaphragm and the outlet unidirectional diaphragm are used to control the unidirectional transport of fluid when the volume of the pressurizing chamber changes.

[0009] It is worth noting that the diaphragm pump assembly converts the rotational motion of the first motor into the reciprocating linear motion of the pressurized diaphragm through an eccentric transmission structure. Combined with the unidirectional conduction characteristics of the inlet and outlet diaphragms, it achieves stable fluid intake and discharge. Multiple sets of water holes are opened on the middle plate, providing a fluid channel foundation for subsequent coordinated operation with the electric reversing valve unit. This ensures smooth flow between the pump assembly and the reversing valve unit, avoiding pressure loss or flow attenuation caused by unreasonable flow channel design.

[0010] Preferably, the pump assembly is an impeller pump assembly, which includes a water chamber and conveying blades assembled in the water chamber. The first output shaft of the first motor is coaxially and fixedly connected to the conveying blades to drive the conveying blades to rotate and convey fluid. The water chamber and the valve chamber in the pump head body are connected through a flow passage.

[0011] It is worth noting that the impeller pump assembly has a simple structure, large flow rate, and continuous output, making it suitable for applications with high flow requirements and low sensitivity to pulsation. The direct drive of the conveying blades by the first motor reduces intermediate transmission links, thereby improving transmission efficiency and operational reliability.

[0012] Preferably, the rotary valve core assembly includes a valve core body and a valve sleeve, wherein the valve core body and / or valve sleeve are integrally formed from graphene or ceramic material; the valve sleeve is fixedly and sealed within the valve cavity, and the side wall of the valve sleeve has flow holes corresponding to each inlet / outlet and flow channel, including a first through hole, a second through hole, and a third through hole, the first through hole, the second through hole, and the third through hole on the side wall of the valve sleeve corresponding to the first inlet / outlet, the second inlet / outlet, and the third inlet / outlet on the pump head body, respectively; the valve core body is rotatably assembled inside the valve sleeve, and the valve core body has openings for connecting different flow holes. The flow channel rotates with the valve core body and aligns with different flow holes to switch to different working positions. A multi-layer planar sealing structure is provided between the axial mating surfaces of the valve core body and the valve sleeve, consisting of a first sealing ring, a sealing spring, a first graphene / ceramic sealing sheet, a second graphene / ceramic sealing sheet, a second sealing ring, a third graphene / ceramic sealing sheet, a third sealing ring, and a fourth sealing ring. The sealing spring provides continuous preload to ensure that the graphene / ceramic sealing sheet is always tightly fitted to form a reliable planar hard seal, while the rubber sealing ring is used for auxiliary sealing and wear compensation.

[0013] It is worth noting that the mating structure of the valve sleeve and valve core body forms a typical rotary valve configuration. The flow passage holes on the valve sleeve correspond one-to-one with the inlet and outlet ports and flow channels on the pump head body, while the flow groove on the valve core body serves as a "bridge" for flow channel switching. When the valve core body rotates to different angles, the flow groove connects different combinations of flow passage holes, thereby achieving precise flow channel switching. The valve sleeve is fixed inside the valve cavity, which not only provides sealing support but also prevents the valve core body from directly rubbing against the pump head body, extending its service life. The valve core body, valve sleeve, and sealing plate, made of graphene or ceramic materials, have the characteristics of good self-lubrication, high hardness, wear resistance, corrosion resistance, and strong thermal stability. Compared with traditional single rubber O-ring seals, there are fewer assembly parts, more stable assembly process, and controllable cost. Moreover, there is no fatigue aging problem of rubber materials, and the service life is increased by 3-5 times. At the same time, through the combination of axial plane hard seal and radial soft seal, a full circumferential leak-free seal is achieved, which greatly reduces the risk of internal leakage and is particularly suitable for complex working conditions such as mixed water circuits and multi-media switching.

[0014] Preferably, the station limiting assembly includes at least one micro switch body, a micro switch contact, and a valve core contact. The micro switch body is fixedly installed at the end of the pump head body, the valve core contact is disposed on the valve core body, and the micro switch contact is disposed on the second output shaft of the second motor. The micro switch body is electrically connected to the second motor. The micro switch contact and the valve core contact are respectively used to trigger the micro switch body when the rotating valve core assembly rotates to different target working positions, so as to control the second motor to stop and lock the working position.

[0015] It is worth noting that the valve core contacts rotate synchronously with the valve core body, and the micro switch contacts rotate synchronously with the second output shaft. When rotating to different preset positions, the valve core contacts and the micro switch contacts respectively touch the fixed micro switch body, triggering the switch action and sending a stop signal to the second motor, so that the second motor accurately stops at the target position. This structure does not require an external position sensor, is compact, responds quickly, and has high positioning accuracy, effectively avoiding overshoot or position drift caused by motor inertia.

[0016] Preferably, the pump head body has three or more inlet and outlet ports, including a first inlet and outlet port, a second inlet and outlet port, and a third inlet and outlet port. The pump head body also has a first water hole, a second water hole, and a third water hole that communicate with the valve cavity. The first water hole communicates with the second water inlet port on the middle plate, and the second water hole communicates with the second water outlet port on the middle plate. The flow groove of the rotary valve core assembly is set with the circumferential angle of each inlet and outlet port and each water hole to select one to guide multiple pipelines and switch the flow direction, so as to realize the multi-channel alternating delivery and distribution of the mixed water path.

[0017] It is worth noting that by setting three or more inlet and outlet ports and coordinating with the circumferential angle design of the flow channel on the rotary valve core assembly, this pump can be expanded into a multi-channel fluid distributor, realizing selective conduction or alternating switching between multiple pipelines. For example, the first inlet and outlet ports, the second inlet and outlet ports, and the third inlet and outlet ports can be connected to different external pipelines respectively. By rotating the rotary valve core assembly, the fluid of the pump water assembly can be selectively delivered to any pipeline, or the fluid in any pipeline can be reversed and drained, greatly expanding the application flexibility of this pump in complex fluid systems.

[0018] Preferably, the integrated venting and pressure relief unit is an integrated design based on the existing pump body outlet chamber space, without changing the overall shape and assembly relationship of the original pump body, and is compatible with the structural frame of the existing drawings; the unit includes a pressure relief valve core, a support frame, and a water passage groove opened on the pump body; the support frame is fixedly assembled to the side wall of the outlet chamber to support the seals at both ends; the water passage groove connects the outlet chamber to the external atmosphere, which can discharge the air accumulated in the pump, and at the same time release the residual pressure in the pipeline after the pump stops, avoiding the aging of the seals and pipeline rupture caused by long-term pressure in the pipeline; the pressure relief valve core is connected to the first output shaft of the first motor through a forward and reverse threaded transmission, and can reciprocate linearly along the axial direction of the first output shaft to open and close the pressure relief passage corresponding to the water passage groove.

[0019] It is worth noting that this invention uses a forward and reverse screw mechanical transmission to control the opening and closing of the exhaust and pressure relief channel, completely abandoning the traditional solution that relies on water pressure or air pressure for automatic opening and closing or external solenoid valves. When the first motor rotates in the forward direction, it drives the pressure relief valve core to move closer to the water outlet chamber through the forward and reverse screw, blocking the pressure relief passage through the water tank, and the water pump enters normal water supply mode without any flow loss. When the first motor rotates in the reverse direction, it drives the pressure relief valve core to move away from the water outlet chamber through the forward and reverse screw, opening the pressure relief passage through the water tank, realizing rapid exhaust and pressure relief of the water pump and pipeline, with no lag in response. This structure does not require additional drive motors or solenoid valves, and the cost is only 1 / 5 of the solenoid valve solution. It is also fully integrated inside the water pump without adding extra volume. At the same time, the pressure relief valve core adopts a symmetrical force balance structure design, with the pressure on both sides canceling each other out. It can be easily opened even under high pressure conditions, completely solving the problem of the traditional structure where the valve core cannot be opened due to high pressure on one side.

[0020] Preferably, the eccentric transmission structure includes an eccentric seat, a connecting rod, and a pusher. The first output shaft of the first motor is coaxially and fixedly connected to the eccentric seat. The eccentric seat is hinged to the pusher via the connecting rod. The end of the pusher is fixedly connected to the pressurizing diaphragm to convert the rotational motion of the first motor into the reciprocating linear motion of the pressurizing diaphragm. The pump body also includes a housing. The first motor and the eccentric transmission structure are housed inside the housing. A first sealing gasket is provided between the partition plate and the middle plate, and a second sealing gasket is provided between the pump head body and the middle plate.

[0021] It is worth noting that the eccentric transmission structure converts rotary motion into reciprocating linear motion, which is simple in structure, has high transmission efficiency, and runs smoothly. The hinged design of the connecting rod and the push frame can adaptively compensate for machining and assembly errors and avoid jamming during the movement. The outer shell encapsulates the first motor and the eccentric transmission structure as a whole, which not only provides protection but also reduces operating noise. The setting of the first sealing gasket and the second sealing gasket ensures the sealing reliability between the partition and the middle plate, and between the pump head body and the middle plate, preventing fluid leakage.

[0022] Preferably, the second motor is fixedly installed at the axial end of the pump head body, and the second output shaft of the second motor is coaxially fixedly connected to the valve core body of the rotary valve core assembly; a first support collar is provided between the valve cavity and the flow passage of the pump water assembly, a second support collar is provided between the valve sleeve and the pump head body, and a third support collar is provided at the end of the valve cavity.

[0023] It is worth noting that the coaxial direct connection design between the second motor and the valve core body reduces intermediate transmission links and improves the commutation response speed and position control accuracy. The setting of the first support collar, the second support collar and the third support collar provides stable radial support for the valve sleeve and the valve core body, ensuring the coaxiality and stability of the valve core body during rotation and avoiding sealing failure caused by eccentric wear.

[0024] Preferably, the pump head body and the pump body are integrally formed; the pump body is also provided with an inlet channel, an outlet channel, a first inlet chamber, a second inlet chamber and an outlet chamber that are connected to the flow channel. The first inlet chamber is connected to the first inlet hole, the second inlet chamber is connected to the second inlet hole, and the outlet chamber is connected to the first outlet hole and the second outlet hole; the pump head body is also provided with an integrated venting and pressure relief unit; the integrated venting and pressure relief unit is located between the outlet chamber and the external atmosphere, including a pressure relief valve core, a support frame and a water passage groove opened on the pump body; the support frame is fixedly assembled to the side wall of the outlet chamber to support the seals at both ends; the water passage groove connects the outlet chamber to the external atmosphere; the pressure relief valve core is connected to the first output shaft of the first motor through a forward and reverse threaded transmission, and can reciprocate linearly along the axial direction of the first output shaft to open and close the pressure relief passage corresponding to the water passage groove.

[0025] It is worth noting that the integrated molding structure of the pump head body and the pump head reduces assembly steps, eliminates the risk of sealing leakage at the connection, and improves the structural strength and compactness of the whole machine. The reasonable layout of the inlet channel, outlet channel and each cavity provides the optimal path for the smooth flow of fluid between the pump assembly and the electric reversing valve unit, avoiding pressure loss and flow resistance caused by too many channel bends.

[0026] Preferably, multiple sealing elements are provided between the valve cavity and the rotary valve core assembly. The sealing elements include a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring, a fifth sealing ring, and a sixth sealing ring. The sealing elements are respectively sleeved on the outer wall of the valve sleeve and the outer wall of the valve core body, and are used to independently seal and isolate the valve cavity from each inlet and outlet and each water hole.

[0027] It is worth noting that the multiple seals form a graded sealing barrier, effectively preventing cross-flow leakage between different inlet / outlet ports and between the inlet / outlet ports and the valve cavity. The seals are respectively arranged on the outer wall of the valve sleeve and the outer wall of the valve core body, achieving both static sealing between the valve sleeve and the pump head body and dynamic sealing between the valve core body and the valve sleeve, ensuring the sealing reliability of the electric reversing valve unit during long-term reciprocating reversing processes. Combined with the axial planar hard seal formed by the graphene or ceramic valve core and valve sleeve, the overall sealing performance is further improved, effectively preventing internal leakage even under high-pressure conditions.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting up an electric reversing valve unit and connecting the rotary valve core assembly to an independent second motor drive, the present invention realizes the online rapid switching of the flow channel, which solves the problems of slow response and bulky structure caused by the need for manual reversing or external reversing valves in traditional pumping systems, and improves the system integration and automation level. 2. By setting at least one working station, including forward water conveying, pressure holding and reverse venting, this invention realizes online switching of fluid conveying direction, pressure holding and reverse suction and venting of pipeline residual fluid, and solves the problems of lack of anti-backflow, anti-siphon and pipeline venting functions in the prior art. It is particularly suitable for application scenarios that require frequent reversal or pipeline venting. 3. This invention achieves high-precision on / off control of multiple flow channels by combining the matching design of the valve core body and valve sleeve in the rotary valve core assembly with the alignment and switching of the flow groove on the valve core body and the flow hole on the valve sleeve. The structure is compact and the sealing is reliable, effectively reducing the risk of leakage during the switching process. 4. By setting up a station limit component and utilizing the cooperation between the micro switch and the valve core contact, this invention achieves precise control of the rotation angle of the second motor and station locking, ensuring the repeatability accuracy of the reversing position and avoiding flow channel switching failure caused by overshoot or position drift. 5. This invention expands the application scenarios of the pump by opening three or more inlet and outlet ports on the pump head body and cooperating with the rotary valve core assembly to realize the selective conduction and flow direction switching of multiple pipelines. It can meet the needs of complex working conditions such as multi-channel fluid distribution, multi-station alternating liquid supply and mixed water pipeline transportation. 6. This invention uses graphene or ceramic materials to prepare the valve core body, valve sleeve and sealing sheet, and combines them with a multi-layer axial planar sealing structure. By utilizing their self-lubricating, high hardness, wear resistance and corrosion resistance, it greatly improves the service life and sealing reliability of the reversing valve unit, enabling it to adapt to the conveying conditions of corrosive fluids, high temperature fluids and media containing abrasive particles. At the same time, it reduces the number of assembly parts, reduces production costs and maintenance frequency. 7. This invention integrates a forward and reverse screw-driven venting and pressure relief unit, which can realize automatic venting and pressure relief of the water pump without additional drive components. This solves the problems of slow response, large flow loss and high cost of traditional solutions. At the same time, the symmetrical force balance structure design ensures the reliable opening of the pressure relief passage under high pressure conditions, extends the service life of pipelines and seals, and further improves the integration and reliability of the system. Attached Figure Description

[0029] Figure 1 The diagram shown is a schematic longitudinal cross-sectional view of the first embodiment of the present invention. Figure 2 What is shown is Figure 1 Schematic diagram of section AA in the diagram; Figure 3 The diagram shown is an exploded view of the electric reversing valve unit of the present invention. Figure 4 The diagram shown is a schematic longitudinal cross-sectional view of the second embodiment of the present invention. Figure 5 What is shown is Figure 4 Schematic diagram of the BB section in the diagram; Figure 6 The diagram shown is a longitudinal cross-sectional view of the multi-layer planar sealing structure of the present invention.

[0030] Reference numerals: 01, First motor; 02, First output shaft; 03, Eccentric seat; 04, Connecting rod; 05, Push frame; 06, Housing; 07, Pressure boosting diaphragm; 08, Middle plate; 09, Pressure boosting chamber; 10, Partition plate; 11, First sealing gasket; 12, First water inlet; 13, One-way water inlet diaphragm; 14, First water outlet; 15, One-way water outlet diaphragm; 16, Water outlet channel; 17, First inlet / outlet; 18, First support collar; 19, First water hole; 20, Second water inlet; 21, First sealing ring; 22, Second sealing ring; 23, First water inlet chamber; 24, Third sealing ring; 25, Microswitch body; 26, Microswitch contact; 27, Second output shaft; 28, Second motor; 29, Valve sleeve; 30, Pump head body; 31, Valve core body; 32, Second outlet... 33. Water inlet; 34. Fourth sealing ring; 35. Second sealing gasket; 36. Second water inlet chamber; 37. Water outlet chamber; 38. Fifth sealing ring; 39. Second support collar; 40. Second water inlet; 41. Second water inlet / outlet; 42. Third water inlet / outlet; 43. Third water inlet; 44. Third support collar; 45. Sixth sealing ring; 46. First through hole; 47. Second through hole; 48. Third through hole; 49. Valve core contact; 50. Water chamber body; 52. Conveying blade; 001. First sealing ring; 002. Sealing spring; 003. First graphene / ceramic sealing sheet; 004. Second graphene / ceramic sealing sheet; 005. Second sealing ring; 006. Third graphene / ceramic sealing sheet; 007. Third sealing ring; 008. Fourth sealing ring. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To address the problems of complex reversing structures, inability to switch flow direction online, and lack of backflow prevention and venting functions in existing pumping systems, the following technical solution is proposed. Please refer to the appendix. Figure 1 - Appendix Figure 5 ; A bidirectional suction and discharge diaphragm pump includes a pump body, which is provided with a pumping assembly for conveying fluid, a first motor 01 for driving the pumping assembly, and a station limiting assembly. The pump body has a flow passage communicating with the pumping assembly, and also includes an electric reversing valve unit. The station limiting assembly is disposed on the pump head body 30 and electrically connected to a second motor 28 for detecting and locking the rotation position of the rotary valve core assembly. The electric reversing valve unit includes a pump head body 30, a rotary valve core assembly, and a second motor 28. The pump head body 30 is integrally integrated with the pump body or is sealed and fixedly connected. The pump head body 30 has at least one inlet and outlet port for communicating with an external pipeline. The pump head body 30 has a valve chamber that communicates with the flow channel. The rotary valve core assembly is rotatably assembled in the valve chamber. The second motor 28 is an independently set reversing drive motor. The second output shaft 27 of the second motor 28 is connected to the rotary valve core assembly for driving the rotary valve core assembly to rotate around its own axis in the valve chamber, so as to change the flow channel opening and closing state and fluid flow direction between the valve chamber and each inlet and outlet port.

[0033] The rotary valve core assembly has at least one working position as the second motor 28 rotates, including: a forward water supply position, a shut-off pressure holding position, and a reverse venting position.

[0034] Example 1: In this example, specifically, the water pump assembly is a diaphragm pump assembly, which includes an eccentric drive structure, a pressure boosting diaphragm 07, a middle plate 08, a partition plate 10, an inlet one-way diaphragm 13, and an outlet one-way diaphragm 15. The first output shaft 02 of the first motor 01 is connected to the eccentric drive structure, and the eccentric drive structure is fixedly connected to the pressure boosting diaphragm 07. A pressure boosting chamber 09 is formed between the pressure boosting diaphragm 07 and the middle plate 08. The middle plate 08 is provided with a first inlet hole 12, a second inlet hole 20, a first outlet hole 14, and a second outlet hole 32. The inlet one-way diaphragm 13 is disposed in the passage between the first inlet hole 12 and the pressure boosting chamber 09, and the outlet one-way diaphragm 15 is disposed in the passage between the pressure boosting chamber 09 and the first outlet hole 14. The inlet one-way diaphragm 13 and the outlet one-way diaphragm 15 are used to control the one-way delivery of fluid when the volume of the pressure boosting chamber 09 changes.

[0035] In this embodiment, the integrated venting and pressure relief unit is located between the outlet chamber 37 of the pump body and the external atmosphere, including a pressure relief valve core, a support frame, and a water passage groove opened on the pump body; the support frame is fixedly assembled to the side wall of the outlet chamber 37 to support the seals at both ends; the water passage groove connects the outlet chamber 37 to the external atmosphere; the pressure relief valve core is connected to the first output shaft 02 of the first motor 01 through a forward and reverse threaded transmission, and can reciprocate linearly along the axial direction of the first output shaft 02 to open and close the pressure relief passage corresponding to the water passage groove; the pressure relief valve core, the support frame, and the water passage groove are all integrated inside the outlet chamber 37 of the pump body and are arranged coaxially with the output shaft of the first motor 01.

[0036] During operation, the first motor 01 rotates in the forward direction, driving the pressure-boosting diaphragm 07 to reciprocate through the eccentric transmission structure to deliver water. On the other hand, the forward and reverse screw drives the pressure relief valve core to move closer to the outlet chamber 37, blocking the pressure relief passage of the water tank and ensuring no leakage or flow loss during water delivery. When the water pump stops and needs to release pressure or needs to vent air during initial startup, the first motor 01 is controlled to rotate in the reverse direction, driving the pressure relief valve core to move away from the outlet chamber 37 through the forward and reverse screw, opening the pressure relief passage of the water tank. The air accumulated in the pump and the residual pressure in the pipeline are quickly discharged through the water tank. The pressure relief valve core adopts a symmetrical force balance structure, and the fluid pressure on both sides cancels each other out. It can be easily opened even under a high pressure of 1.6MPa without the risk of jamming.

[0037] Example 2: As another implementation, the water pump assembly is an impeller pump assembly. The impeller pump assembly includes a water chamber 50 and a conveying blade 52 assembled in the water chamber 50. The first output shaft 02 of the first motor 01 is coaxially fixedly connected to the conveying blade 52 and is used to drive the conveying blade 52 to rotate to convey fluid. The water chamber 50 is connected to the valve chamber in the pump head body 30 through a flow passage.

[0038] The specific structure, connection relationship, and working principle of the electric reversing valve unit, station limit component, multi-inlet / outlet flow channel switching structure, seal, and integrated exhaust pressure relief unit in this embodiment are completely consistent with those in Embodiment 1. The only difference is that the pump assembly is replaced with an impeller pump assembly. The impeller pump assembly includes a water chamber 50 and a conveying blade 52 assembled in the water chamber 50. The first output shaft 02 of the first motor 01 is coaxially fixedly connected to the conveying blade 52 and is used to drive the conveying blade 52 to rotate to convey fluid. The water chamber 50 is connected to the valve chamber in the pump head body 30 through a flow passage.

[0039] In this embodiment, specifically, the rotary valve core assembly includes a valve core body 31 and a valve sleeve 29. The valve core body 31 and / or the valve sleeve 29 are integrally formed from graphene or ceramic materials. The valve sleeve 29 is fixedly and sealed within the valve cavity. The side wall of the valve sleeve 29 has flow holes corresponding to each inlet / outlet and flow channel. The flow holes include a first through hole 46, a second through hole 47, and a third through hole 48. The first through hole 46, the second through hole 47, and the third through hole 48 on the side wall of the valve sleeve 29 correspond to the first inlet / outlet 17, the second inlet / outlet 41, and the third inlet / outlet 42 on the pump head body 30, respectively. The valve core body 31 is rotatably assembled inside the valve sleeve 29. The valve core body 31 has flow grooves for connecting different flow holes. The flow grooves rotate with the valve core body 31 and align with different flow holes to switch to different working positions. A multi-layer planar sealing structure is provided between the axial mating surfaces of the valve core body 31 and the valve sleeve 29, consisting of a first sealing ring 001, a sealing spring 002, a first graphene / ceramic sealing sheet 003, a second graphene / ceramic sealing sheet 004, a second sealing ring 005, a third graphene / ceramic sealing sheet 006, a third sealing ring 007, and a fourth sealing ring 008. The sealing spring 002 provides continuous preload to ensure tight contact between the sealing surfaces and achieve the synergistic effect of hard and soft seals.

[0040] In this embodiment, specifically, the station limiting component includes at least one micro switch body 25, a micro switch contact 26, and a valve core contact 49. The micro switch body 25 is fixedly installed at the end of the pump head body 30, the valve core contact 49 is disposed on the valve core body 31, and the micro switch contact 26 is disposed on the second output shaft 27 of the second motor 28. The micro switch body 25 is electrically connected to the second motor 28. The micro switch contact 26 and the valve core contact 49 are respectively used to trigger the micro switch body 25 when the rotating valve core assembly rotates to different target working positions, so as to control the second motor 28 to stop and lock the working position.

[0041] In this embodiment, specifically, the pump head body 30 has three or more inlet and outlet ports, including a first inlet / outlet port 17, a second inlet / outlet port 41, and a third inlet / outlet port 42. The pump head body 30 also has a first water hole 19, a second water hole 40, and a third water hole 43 communicating with the valve chamber. The first water hole 19 communicates with the second water inlet hole 20 on the middle plate 08, and the second water hole 40 communicates with the second water outlet hole 32 on the middle plate 08. The flow channel of the rotary valve core assembly is set with a corresponding circumferential angle to each inlet / outlet port and each water hole, used to selectively guide multiple pipelines and switch flow directions. The pump head body 30 is equipped with an integrated venting and pressure relief unit. The integrated venting and pressure relief unit is located between the outlet chamber 37 and the external atmosphere and includes a pressure relief valve core, a support frame, and a water passage groove opened on the pump body. The support frame is fixedly mounted on the side wall of the outlet chamber 37 to support the seals at both ends. The water passage groove connects the outlet chamber 37 to the external atmosphere. The pressure relief valve core is connected to the first output shaft 02 of the first motor 01 through a forward and reverse threaded transmission, and can reciprocate linearly along the axial direction of the first output shaft 02 to open and close the pressure relief passage corresponding to the water passage groove.

[0042] In this embodiment, specifically, the eccentric transmission structure includes an eccentric seat 03, a connecting rod 04, and a pusher 05. The first output shaft 02 of the first motor 01 is coaxially and fixedly connected to the eccentric seat 03. The eccentric seat 03 is hinged to the pusher 05 through the connecting rod 04. The end of the pusher 05 is fixedly connected to the pressurizing diaphragm 07, which is used to convert the rotational motion of the first motor 01 into the reciprocating linear motion of the pressurizing diaphragm 07. The pump body also includes a housing 06. The first motor 01 and the eccentric transmission structure are both housed inside the housing 06. A first sealing gasket 11 is provided between the partition plate 10 and the middle plate 08, and a second sealing gasket 35 is provided between the pump head body 30 and the middle plate 08.

[0043] In this embodiment, specifically, the second motor 28 is fixedly installed at the axial end of the pump head body 30, and the second output shaft 27 of the second motor 28 is coaxially fixedly connected to the valve core body 31 of the rotary valve core assembly; a first support collar 18 is provided between the valve cavity and the flow passage of the pump water assembly, a second support collar 39 is provided between the valve sleeve 29 and the pump head body 30, and a third support collar 44 is provided at the end of the valve cavity.

[0044] In this embodiment, specifically, the pump head body 30 and the pump head of the pump body are integrally formed; the pump body is also provided with an inlet channel 33, an outlet channel 16, a first inlet chamber 23, a second inlet chamber 36 and an outlet chamber 37 that are connected to the flow channel. The first inlet chamber 23 is connected to the first inlet hole 12, the second inlet chamber 36 is connected to the second inlet hole 20, and the outlet chamber 37 is connected to the first outlet hole 14 and the second outlet hole 32.

[0045] In this embodiment, specifically, multiple sealing elements are provided between the valve cavity and the rotary valve core assembly. The sealing elements include a first sealing ring 21, a second sealing ring 22, a third sealing ring 24, a fourth sealing ring 34, a fifth sealing ring 38, and a sixth sealing ring 45. The sealing elements are respectively sleeved on the outer wall of the valve sleeve 29 and the outer wall of the valve core body 31, and are used to independently seal and isolate the valve cavity from each inlet and outlet and each water hole. The axial planar sealing structure and the radial sealing ring sealing structure cooperate with each other to form a full circumferential sealing barrier, completely eliminating the risk of internal and external leakage.

[0046] The specific installation and connection relationship of each sealing component is as follows: The first sealing ring 21 is embedded in the upper annular groove of the outer wall of the valve sleeve 29. The valve sleeve 29 is press-fitted with the inner wall of the valve cavity of the pump head body 30 through the first sealing ring 21, realizing radial static sealing between the corresponding flow channels of the first inlet / outlet 17 and the second inlet / outlet 41, isolating the independent flow channels of the two inlets / outlets to prevent lateral liquid cross-flow between adjacent flow channels; The second sealing ring 22 is embedded in the left annular groove of the outer wall of the valve sleeve 29 and is symmetrically arranged with the first sealing ring 21 around the circumference. The valve sleeve 29 is press-fitted with the inner wall of the valve cavity of the pump head body 30 through the second sealing ring 22, realizing radial static sealing between the first inlet / outlet 17 and the second inlet / outlet 41, isolating the independent flow channels of the two inlets / outlets to prevent lateral liquid cross-flow between adjacent flow channels; A radial static seal is formed between the inlet / outlet 17 and the third inlet / outlet 42, isolating the independent flow channels of the first inlet / outlet 17 and the third inlet / outlet 42. A third sealing ring 24 is embedded in the end annular groove on the axial left end of the valve sleeve 29. The valve sleeve 29 is press-fitted against the axial stepped surface of the valve cavity of the pump head body 30 via the third sealing ring 24, achieving an axial static seal between the valve cavity and the flow passage of the pump assembly. This isolates the valve cavity from the internal chamber of the pump body to prevent high-pressure fluid from leaking into the non-flow area inside the pump body. A fifth sealing ring 38 is embedded in the right annular groove on the outer wall of the valve sleeve 29. The valve sleeve 29 is sealed by the fifth sealing ring 38. The valve core body 31 is press-fitted against the inner wall of the valve cavity of the pump head body 30 to achieve a radial static seal between the corresponding flow channels of the second inlet / outlet 41 and the third inlet / outlet 42, isolating the independent flow channels of the two inlets / outlets. It also cooperates with the first sealing ring 21 and the second sealing ring 22 to form a circumferentially enclosed sealing barrier, achieving complete independent sealing and isolation of the three inlet / outlet flow channels. The fourth sealing ring 34 is embedded in the left annular groove of the flow groove on the outer wall of the valve core body 31. The valve core body 31 is press-fitted against the inner wall of the valve sleeve 29 through the fourth sealing ring 34, achieving a radial dynamic seal between the valve core body 31 and the valve sleeve 29. This seal is used during valve core rotation switching. During the process, the flow channels are continuously isolated from the flow channels to prevent internal leakage in the flow channels at different positions inside the valve cavity, ensuring that the flow channel opening and closing status is precise and controllable. The sixth sealing ring 45 is embedded in the end annular groove at the right end of the valve core body 31. The valve core body 31 is press-fitted with the inner wall of the valve sleeve 29 through the sixth sealing ring 45 to achieve axial dynamic sealing between the valve core body 31 and the valve sleeve 29. At the same time, it isolates the valve cavity from the external environment, preventing the fluid in the valve cavity from leaking to the second motor 28 side and causing a short circuit in the motor. On the other hand, it prevents external dust and impurities from entering the valve cavity and causing wear on the mating surfaces of the valve core and the valve sleeve 29.

[0047] Working principle: When in use, the first motor 01 drives the water pump assembly to work, realizing the intake and discharge of fluid. When it is necessary to transport fluid in the forward direction, the second motor 28 is controlled to drive the rotary valve core assembly to rotate to the forward water delivery position. At this time, the flow channel is connected to the first inlet and outlet 17 and cut off from the second inlet and outlet 41. The water pump assembly draws water through the first inlet and outlet 17 and discharges water through the second inlet and outlet 41, forming a forward fluid transport. When it is necessary to stop the delivery and maintain the pipeline pressure or prevent backflow, the second motor 28 is controlled to drive the rotary valve core assembly to rotate to the cut-off pressure holding position. At this time, the flow channel and all inlet and outlet water ports are cut off, forming a closed flow channel, effectively preventing fluid flow and realizing the functions of water stop, backflow prevention and anti-siphon. When it is necessary to drain the residual fluid in the pipeline, the second motor 28 is controlled to drive the rotary valve core assembly to rotate to the reverse draining position. At this time, the flow passage is connected to the second inlet and outlet 41 and cut off from the first inlet and outlet 17. The pump assembly draws water through the second inlet and outlet 41 and drains water through the first inlet and outlet 17, thereby realizing the reverse suction and drainage of the residual fluid in the pipeline. When the water pump needs to vent air upon initial startup or release pipeline pressure after shutdown, the first motor 01 is controlled to rotate in reverse. Through forward and reverse screw transmission, the pressure relief valve core is driven to move axially, opening the pressure relief passage through the water tank and quickly expelling air from the pump and residual pressure from the pipeline. After the venting and pressure relief are completed, the first motor 01 is controlled to resume forward rotation, the pressure relief valve core automatically resets and seals the pressure relief passage, and the water pump enters normal working condition. During the above-mentioned workstation switching process, the second output shaft 27 of the second motor 28 drives the valve core body 31 to rotate. When the valve core body 31 rotates to different target workstations, the valve core contact 49 set on the valve core body 31 and the micro switch contact 26 set on the second output shaft 27 respectively touch the fixed micro switch body 25 and trigger the switch action. The micro switch body 25 sends a stop signal to the second motor 28 and locks the current workstation to ensure the accuracy of the reversing position. When the pump head body 30 has 3 or more inlet and outlet ports, the flow groove of the rotary valve core assembly can be set according to the circumferential angle and matched with different water holes and inlet and outlet ports to realize the selective conduction and flow direction switching of multiple pipelines, and meet the needs of multi-channel fluid distribution or alternating liquid supply and mixed water transmission. The bidirectional suction and discharge diaphragm pump of the present invention achieves online rapid switching of the flow channel, pressure holding and reverse venting functions through the integrated design of electric reversing valve unit and pump water assembly. It has the advantages of high integration, fast response, reliable sealing and wide applicability.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A bidirectional suction-discharge diaphragm pump, comprising a pump body, the pump body being provided with a pumping assembly for conveying fluid, a first motor (01) for driving the pumping assembly, and a station limiting assembly, wherein a flow channel communicating with the pumping assembly is provided inside the pump body, characterized in that, It also includes an electric reversing valve unit; the station limit assembly is set on the pump head body (30) and electrically connected to the second motor (28) to detect and lock the rotation station of the rotary valve core assembly; The electric reversing valve unit includes a pump head body (30), a rotary valve core assembly, and a second motor (28). The pump head body (30) is integrally integrated with the pump body or sealed and fixedly connected. The pump head body (30) is provided with at least one inlet and outlet for connecting with an external pipeline. The pump head body (30) is provided with a valve chamber that connects with the flow passage. The rotary valve core assembly is rotatably assembled in the valve chamber. The second motor (28) is an independently set reversing drive motor. The second output shaft (27) of the second motor (28) is connected to the rotary valve core assembly for driving the rotary valve core assembly to rotate around its own axis in the valve cavity, so as to change the flow channel opening and closing state and fluid flow direction between the valve cavity and each inlet and outlet. The rotary valve core assembly has at least one working position as it rotates with the second motor (28), including: Forward water conveyance station: The rotary valve core assembly connects the flow channel with the first inlet / outlet (17) and cuts off the flow channel with the second inlet / outlet (41). The pump assembly draws water through the first inlet / outlet (17) and drains water through the second inlet / outlet (41) to form a forward fluid conveyance. Pressure holding position: The rotary valve core assembly shuts off the flow channel and all inlet and outlet ports, forming a closed flow channel to prevent fluid flow. Reverse evacuation station: The rotating valve core assembly connects the flow channel with the second inlet / outlet (41) and cuts off the first inlet / outlet (17). The pump assembly draws water through the second inlet / outlet (41) and drains water through the first inlet / outlet (17) to pump out the residual fluid in the evacuation pipeline.

2. The bidirectional suction / discharge diaphragm pump according to claim 1, characterized in that, The pump assembly is a diaphragm pump assembly, which includes an eccentric drive structure, a pressure boosting diaphragm (07), a middle plate (08), a partition plate (10), an inlet one-way diaphragm (13), and an outlet one-way diaphragm (15). The first output shaft (02) of the first motor (01) is connected to the eccentric drive structure, and the eccentric drive structure is fixedly connected to the pressure boosting diaphragm (07). A pressure boosting chamber (09) is formed between the pressure boosting diaphragm (07) and the middle plate (08). The middle plate (08) has an opening. The system includes a first water inlet (12), a second water inlet (20), a first water outlet (14), and a second water outlet (32). A one-way diaphragm (13) is provided in the passage between the first water inlet (12) and the pressurization chamber (09). A one-way diaphragm (15) is provided in the passage between the pressurization chamber (09) and the first water outlet (14). The one-way diaphragm (13) and the one-way diaphragm (15) are used to control the one-way transport of fluid when the volume of the pressurization chamber (09) changes.

3. The bidirectional suction / discharge diaphragm pump according to claim 1, characterized in that, The pump assembly is an impeller pump assembly, which includes a water chamber (50) and a conveying blade (52) assembled in the water chamber (50). The first output shaft (02) of the first motor (01) is coaxially fixedly connected to the conveying blade (52) and is used to drive the conveying blade (52) to rotate to convey fluid. The water chamber (50) and the valve chamber in the pump head body (30) are connected through a flow passage.

4. A bidirectional suction / discharge diaphragm pump according to claim 1, characterized in that, The rotary valve core assembly includes a valve core body (31) and a valve sleeve (29). The valve core body (31) and / or the valve sleeve (29) are integrally formed from graphite or ceramic materials. The valve sleeve (29) is fixedly and sealed in the valve cavity. The side wall of the valve sleeve (29) is provided with flow holes corresponding to each inlet and outlet and flow channel. The flow holes include a first through hole (46), a second through hole (47), and a third through hole (48). The first through hole (46), the second through hole (47), and the third through hole (48) on the side wall of the valve sleeve (29) correspond to the first inlet and outlet (17), the second inlet and outlet (41), and the third inlet and outlet (42) on the pump head body (30), respectively. (31) Rotatably assembled inside the valve sleeve (29), the valve core body (31) is provided with a flow groove for connecting different flow holes. The flow groove rotates with the valve core body (31) and aligns with different flow holes to switch to different working positions. A multi-layer planar sealing structure is provided between the axial mating surfaces of the valve core body (31) and the valve sleeve (29), including a first sealing ring (001), a sealing spring (002), a first graphene / ceramic sealing sheet (003), a second graphene / ceramic sealing sheet (004), a second sealing ring (005), a third graphene / ceramic sealing sheet (006), a third sealing ring (007), and a fourth sealing ring (008).

5. A bidirectional suction / discharge diaphragm pump according to claim 4, characterized in that, The station limiting assembly includes at least one micro switch body (25), micro switch contact (26), and valve core contact (49). The micro switch body (25) is fixedly installed at the end of the pump head body (30), the valve core contact (49) is set on the valve core body (31), and the micro switch contact (26) is set on the second output shaft (27) of the second motor (28). The micro switch body (25) is electrically connected to the second motor (28). The micro switch contact (26) and the valve core contact (49) are respectively used to trigger the micro switch body (25) when the rotating valve core assembly rotates to different target working positions, so as to control the second motor (28) to stop and lock the working position.

6. A bidirectional suction / discharge diaphragm pump according to claim 2, characterized in that, The pump head body (30) is provided with three or more inlet and outlet ports, including a first inlet and outlet port (17), a second inlet and outlet port (41), and a third inlet and outlet port (42). The pump head body (30) is also provided with a first water hole (19), a second water hole (40), and a third water hole (43) that communicate with the valve cavity. The first water hole (19) communicates with the second water inlet hole (20) on the middle plate (08), and the second water hole (40) communicates with the second water outlet hole (32) on the middle plate (08). The flow channel of the rotary valve core assembly is set with the circumferential angle of each inlet and outlet port and each water hole, which is used to select one to guide multiple pipelines and switch the flow direction.

7. A bidirectional suction / discharge diaphragm pump according to claim 2, characterized in that, The eccentric transmission structure includes an eccentric seat (03), a connecting rod (04), and a pusher (05). The first output shaft (02) of the first motor (01) is coaxially fixedly connected to the eccentric seat (03). The eccentric seat (03) is hinged to the pusher (05) through the connecting rod (04). The end of the pusher (05) is fixedly connected to the pressurizing diaphragm (07) to convert the rotational motion of the first motor (01) into the reciprocating linear motion of the pressurizing diaphragm (07). The pump body also includes a housing (06). The first motor (01) and the eccentric transmission structure are both housed inside the housing (06). A first sealing gasket (11) is provided between the partition plate (10) and the middle plate (08). A second sealing gasket (35) is provided between the pump head body (30) and the middle plate (08).

8. A bidirectional suction / discharge diaphragm pump according to claim 1, characterized in that, The second motor (28) is fixedly installed at the axial end of the pump head body (30). The second output shaft (27) of the second motor (28) is coaxially fixedly connected to the valve core body (31) of the rotary valve core assembly. A first support collar (18) is provided between the valve cavity and the flow passage of the pump water assembly. A second support collar (39) is provided between the valve sleeve (29) and the pump head body (30). A third support collar (44) is provided at the end of the valve cavity.

9. A bidirectional suction / discharge diaphragm pump according to claim 2, characterized in that, The pump head body (30) and the pump head of the pump body are integrally formed; the pump body is also provided with an inlet channel (33), an outlet channel (16), a first inlet chamber (23), a second inlet chamber (36) and an outlet chamber (37) connected to the flow channel. The first inlet chamber (23) is connected to the first inlet hole (12), the second inlet chamber (36) is connected to the second inlet hole (20), and the outlet chamber (37) is connected to the first outlet hole (14) and the second outlet hole (32); the pump head body (30) is also provided with an integrated exhaust vent. Pressure relief unit; The integrated venting and pressure relief unit is located between the water outlet chamber (37) and the external atmosphere, including a pressure relief valve core, a support frame and a water passage groove opened on the pump body; The support frame is fixedly mounted on the side wall of the water outlet chamber (37) to support the seals at both ends; The water passage groove connects the water outlet chamber (37) and the external atmosphere; The pressure relief valve core is connected to the first output shaft (02) of the first motor (01) through a forward and reverse screw drive, and can reciprocate linearly along the axial direction of the first output shaft (02) to open and close the pressure relief passage corresponding to the water passage groove.

10. A bidirectional suction / discharge diaphragm pump according to claim 6, characterized in that, Multiple sealing elements are provided between the valve cavity and the rotary valve core assembly. The sealing elements include a first sealing ring (21), a second sealing ring (22), a third sealing ring (24), a fourth sealing ring (34), a fifth sealing ring (38), and a sixth sealing ring (45). The sealing elements are respectively fitted on the outer wall of the valve sleeve (29) and the outer wall of the valve core body (31) to independently seal and isolate the valve cavity from each inlet and outlet and each water hole. The axial plane sealing structure and the radial sealing ring sealing structure cooperate with each other. When the first motor (01) rotates in the forward direction, it drives the pressure relief valve core to move towards the outlet cavity (37) through the forward and reverse screw threads, blocking the pressure relief passage through the water tank, and the water pump enters the normal water supply state.

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