Waterway pressure switch with pressure relief function

Abstract

The application discloses a waterway pressure switch with pressure relief function, which comprises a switch shell and a pressure relief assembly, and a waterway channel is arranged in the switch shell; the pressure relief assembly comprises a pressure relief channel, a pressure relief plug and a pressure relief spring; the pressure relief channel is communicated with the waterway channel; the pressure relief plug is movably arranged in the pressure relief channel; the pressure relief spring applies a pre-tightening force to the pressure relief plug, which is directed to closing a pressure relief flow port; when the water pressure in the waterway channel reaches a preset threshold, the pressure relief plug moves to open the pressure relief flow port to release pressure by overcoming the pre-tightening force. The pressure relief assembly is directly arranged in the switch shell according to the technical scheme, and is not an external device independent of the waterway switch. The design makes the waterway switch itself have double functions of pressure sensing on-off and overpressure relief protection, saves installation space, simplifies system layout, is beneficial to compact product structure, and is suitable for pressure control and overload protection of a waterway system.

Description

Technical Field

[0001] This invention relates to the field of inductive switch technology, and more specifically to a water pressure switch with pressure relief function. Background Technology

[0002] Water circuit switches, as an automated control component, are widely used in household appliances such as water purifiers, water softeners, and dishwashers. They are used to automatically control the on / off state of circuits based on pressure changes in the water system. Existing mechanical water circuit switches typically include a switch housing, an inlet pipe, a sealing diaphragm, and a contact assembly. Their working principle is based on simple mechanical transmission and sealing. Water is introduced through the inlet pipe, and water pressure acts on one side of the sealing diaphragm. The diaphragm deforms under pressure, driving the contact assembly to move and close or separate, thus connecting or disconnecting the circuit, thereby controlling the start and stop of actuators such as water pumps.

[0003] However, in practical applications, existing mechanical water circuit switches have the following problems: when the water pump continues to supply water and the switch fails to disconnect in time due to circuit failure, abnormal control logic, or other reasons, abnormal high pressure will be generated in the pipeline system. More commonly, abnormal pressure can easily accumulate in the sealed pipeline between the water circuit switch and the water-using equipment, especially when the pipeline is full of water and there is no pressure relief channel. Thermal expansion and contraction or water hammer can cause the pressure inside the pipe to rise sharply. This sudden increase in pressure will not only put additional pressure on the internal seals of the switch, accelerating their aging and deformation and reducing the reliability of the seal, but in severe cases, it may even lead to leakage at the pipeline connection and even cause the risk of pipeline rupture, posing a potential property loss hazard to users. Therefore, how to effectively solve the problem of pipeline pressure accumulation in the closed state while ensuring the basic on / off function of the mechanical water circuit switch and improving system safety has become an urgent technical direction for improvement in this field. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem that a sudden increase in internal pressure of the water circuit switch in the prior art will cause additional compression to the internal seals of the switch, accelerate their aging and deformation, reduce the reliability of the seal, and in severe cases even lead to leakage at the pipe connection and even cause the risk of pipe bursting.

[0005] To solve the above-mentioned technical problems, the present invention provides a water pressure switch with a pressure relief function, comprising: a water circuit body and a switch module, wherein the water circuit body includes a switch housing having a water circuit channel and a pressure relief component disposed in the switch housing, the pressure relief component comprising: A pressure relief channel is provided on the switch housing, and the pressure relief channel has a pressure relief outlet that communicates with the water passage; A pressure relief plug is movably disposed within the pressure relief channel to close or open the pressure relief outlet; A pressure relief spring is disposed within the pressure relief channel and applies a preload force to the pressure relief plug in the direction of closing the pressure relief outlet; the pressure relief plug is used to move against the preload force when the water pressure in the water channel reaches a preset threshold, so as to open the pressure relief outlet and release the pressure.

[0006] As a preferred embodiment, the pressure relief assembly includes a pressure relief connector threaded onto the switch housing, and a pressure relief conduit disposed within the pressure relief connector and communicating with a water passage; the pressure relief passage includes a first flow path disposed within the pressure relief conduit and a main flow path disposed within the pressure relief connector; a pressure relief outlet is formed at one end of the pressure relief conduit facing the pressure relief plug, and the pressure relief plug and pressure relief spring are connected and disposed within the pressure relief connector.

[0007] As a preferred embodiment, the switch housing is provided with a water interface connected to the water channel. The pressure relief conduit is truncated cone-shaped, with the pressure relief outlet at the smaller diameter end and the larger diameter end extending into the water interface. The pressure relief plug is slidably disposed in the main flow path relative to the pressure relief conduit and, under the action of the pressure relief spring, cooperates to seal the pressure relief outlet of the pressure relief conduit.

[0008] As a preferred embodiment, the pressure relief connector is equipped with a manual pressure relief structure, which includes: A pressure relief sealing gasket is fitted onto one end sidewall of the pressure relief conduit to seal the port position of the water interface when the pressure relief connector is threaded. The second flow path is located between the switch housing and the pressure relief connector, and is used to connect the water interface and the main flow path; A sealing ring is disposed between the pressure relief connector and the switch housing and located on the lower side of the second flow path, for maintaining the seal between the second flow path and the external environment during manual pressure relief; When the pressure relief connector is screwed on and moved outward relative to the switch housing, the pressure relief sealing gasket is released from the seal on the water interface port, allowing the water channel to connect sequentially through the water interface, the second flow path, and the main flow path to achieve manual pressure relief.

[0009] As a preferred embodiment, the second flow path includes a pressure relief bypass axially disposed on the threaded portion of the pressure relief joint, and a side pressure relief port radially penetrating the pressure relief joint and communicating with the main flow path, the side pressure relief port being connected to the lower end of the pressure relief bypass.

[0010] As a preferred embodiment, an anti-detachment structure is provided between the switch housing and the pressure relief connector, the anti-detachment structure comprising: A connecting part is provided on the switch housing, and its interior has an internal thread structure for connecting with the pressure relief connector; A limiting boss is formed on the outer peripheral sidewall of the pressure relief joint. An annular groove for accommodating the sealing ring is formed on the limiting boss. The sealing ring is in sealing contact with the inner wall of the connecting part. The U-shaped locking component is detachably installed on the connecting part and passes through the interior of the connecting part, and is arranged vertically opposite to the limiting protrusion. When the pressure relief connector is screwed to the preset position, the U-shaped locking member abuts against the limiting boss to restrict the axial movement of the pressure relief connector relative to the switch housing.

[0011] As a preferred embodiment, the pressure relief assembly further includes an adjusting core threaded into the outlet of the pressure relief connector. The adjusting core has a hollow structure and is disposed opposite to the pressure relief plug. One end of the pressure relief spring abuts against the pressure relief plug, and the other end abuts against the adjusting core. Rotating the adjusting core is used to adjust the preload applied by the pressure relief spring to the pressure relief plug.

[0012] As a preferred embodiment, the inner wall of the main flow path is conical, gradually increasing in size from the pressure relief outlet towards its outlet. The pressure relief plug is in sealing contact with the conical inner wall of the pressure relief channel when closing the pressure relief outlet, and disengages from the conical inner wall of the pressure relief channel when moving away from the pressure relief outlet. An elastic sealing gasket is provided on the side of the pressure relief plug facing the pressure relief conduit.

[0013] As a preferred embodiment, the switch module includes: A connector is attached to the switch housing and together with the switch housing, forms an electrical cavity; A drive assembly includes a drive diaphragm that is sealed between the electrical cavity and the water passage, the drive diaphragm isolating the electrical cavity and the water passage from each other, and the drive assembly is configured to operate in response to deformation of the drive diaphragm caused by changes in water pressure within the water passage; A contact assembly is housed within the electrical cavity. The contact assembly includes an annular moving contact that is linked to the drive assembly, and two stationary contacts disposed on the connector seat and opposite to the moving contact. The two stationary contacts have two terminals extending out of the connector seat.

[0014] As a preferred embodiment, the driving component includes: A transmission disc, connected between the drive diaphragm and the contact assembly, is used to transmit the deformation force of the drive diaphragm; A return spring is disposed between the connector seat and the transmission disk, and applies an elastic force to the transmission disk to move toward the drive diaphragm side; The connector seat has a guide hole extending through it along the axial direction. The transmission disk includes a guide post that slides with the guide hole. The guide post has a positioning hole for installing a reset spring. An adjusting nut is threaded into the guide hole. One end of the reset spring abuts against the adjusting nut, and the other end abuts against the transmission disk. The elastic force of the reset spring is adjusted by turning the adjusting nut.

[0015] The technical solution of the present invention has the following advantages compared with the prior art: 1. The water pressure switch provided by this invention integrates a pressure relief component within the switch housing. This component includes a pressure relief channel connected to the water passage, a movable pressure relief plug, and a pressure relief spring providing pre-tightening force. This forms a pressure threshold-triggered automatic pressure relief mechanism. When abnormally high pressure is generated in the water passage and reaches a preset threshold, the water pressure pushes the pressure relief plug to overcome the pre-tightening force of the pressure relief spring, opening the pressure relief outlet to release excess pressure. This fundamentally avoids the situation of continuous and sudden pressure increases in the pipeline, completely solving the risk of pipeline leakage and rupture caused by pressure accumulation in existing switches. Since the pressure relief component is directly installed inside the switch housing and is not an external device independent of the water switch, compared to the existing technology that requires additional pressure relief valves, pressure relief pipes, and other accessories in the pipeline system, this design allows the water switch to have both pressure sensing on / off and overpressure relief protection functions, saving installation space, simplifying system layout, and making the product structure more compact. It is suitable for pressure control and overload protection in water systems.

[0016] 2. In the water pressure switch provided by the present invention, the pressure relief component uses an independent pressure relief connector as a carrier and is connected to the switch housing by threads. The pressure relief plug, pressure relief spring, and pressure relief conduit can be pre-assembled into a complete component in the pressure relief connector and then screwed into the switch housing as a whole, which greatly improves the production and assembly efficiency. The use of an independent pressure relief connector with threaded connection realizes modular design and reduces maintenance costs and operation difficulty.

[0017] 3. In the water pressure switch provided by this invention, the end with the larger diameter of the pressure relief conduit is connected to the water channel to form a gradually narrowing flow channel. This gradually narrowing flow channel can play a certain throttling role during pressure relief, avoiding excessive pressure relief flow that could cause a sudden drop in system pressure and maintaining stable water system pressure. Furthermore, the end with the smaller diameter of the pressure relief conduit is used as the pressure relief outlet, forming a small-area, high-precision sealing fit with the pressure relief plug. The smaller sealing contact area allows for a higher sealing specific pressure under the same spring preload, effectively blocking leakage between the water channel and the pressure relief channel under normal conditions, enhancing sealing reliability, and improving anti-leakage performance.

[0018] 4. The manual pressure relief structure of the water circuit pressure switch provided by this invention is achieved by adding a second flow path and a sealing element to the pressure relief connector and switch housing on the basis of the original pressure relief component. It does not change the structure, installation method and working principle of the automatic pressure relief core component, and realizes the integrated integration of manual pressure relief function and connector body. It greatly simplifies the overall structure and assembly process of the water circuit switch. When the automatic pressure relief component fails to trigger pressure relief, or in scenarios where the water circuit system needs to be manually depressurized, inspected and emptied, the bypass can be forcibly opened by turning the pressure relief connector, that is, the water circuit channel and the main flow can be connected through the second water circuit. It can quickly complete the active pressure relief operation, improve the convenience of use and maintenance, and the operation does not require any tools. It solves the risk of pressure buildup in the water circuit system, and at the same time adapts to the working conditions of rapid pressure relief and maintenance on site, greatly improving the fault tolerance rate and operational safety of the entire water circuit system.

[0019] 5. In the water pressure switch provided by this invention, the anti-detachment structure can specifically prevent the pressure relief connector from loosening and falling off during manual pressure relief operation. Through the axial limiting cooperation of the U-shaped locking member and the limiting boss, it effectively restrains the axial movement and tendency to fall off during the pressure relief adjustment process of screwing the pressure relief connector, avoiding the loosening of threads and the detachment of the connector due to repeated screwing operations, and ensuring the continuous and stable operation of manual pressure relief. At the same time, it can prevent the connector from accidentally falling off during the pressure relief process, causing problems such as water splashing and sudden loss of system pressure, ensuring the safety and controllability of pressure relief operation. With the threaded connection of the connecting part, the pressure relief connector remains firmly assembled under repeated manual screwing conditions, improving the operational reliability and durability of the manual pressure relief structure, taking into account both the anti-detachment effect and sealing reliability. The overall structure is compact and easy to disassemble and assemble, and is suitable for daily pressure relief maintenance of high-pressure water systems. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0021] Figure 1 A three-dimensional structural schematic diagram of the water pressure switch provided by the present invention; Figure 2 This is a schematic diagram of the planar structure of the water pressure switch of the present invention; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along line AA; Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure along line BB; Figure 5 This is a schematic diagram of the pressure relief connector of the present invention.

[0022] Explanation of reference numerals in the attached drawings: 1. Switch housing; 11. Water passage; 12. Electrical cavity; 13. Water interface; 14. Connecting part; 2. Drive diaphragm; 3. Transmission disc; 31. Guide post; 4. Return spring; 5. Pressure relief assembly; 51. Pressure relief connector; 52. Pressure relief plug; 53. Pressure relief spring; 54. Pressure relief conduit; 55. Adjusting core; 56. Pressure relief sealing gasket; 57. Sealing ring; 58. Limiting boss; 6. Pressure relief channel; 61. First flow path; 62. Main flow path; 63. Second flow path; 64. Pressure relief bypass; 65. Side pressure relief port; 7. U-shaped lock; 8. Connector seat; 81. Guide hole; 82. Adjusting nut; 91. Moving contact; 92. Stationary contact. Detailed Implementation

[0023] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Example This embodiment provides, as follows: Figure 1-5 The water pressure switch with pressure relief function shown includes a water circuit body and a switch module. The water circuit body includes a switch housing 1 with a water circuit channel 11 and a pressure relief component 5 disposed in the switch housing 1. The pressure relief component 5 includes: A pressure relief channel 50 is provided on the switch housing 1, and the pressure relief channel 50 has a pressure relief outlet that communicates with the water passage 11; The pressure relief plug 52 is movably disposed within the pressure relief channel 50 and is used to close or open the pressure relief outlet; A pressure relief spring 53 is disposed in the pressure relief channel 50 and applies a pre-tightening force to the pressure relief plug 52 in the direction of closing the pressure relief outlet; the pressure relief plug 52 is used to move against the pre-tightening force when the water pressure in the water channel 11 reaches a preset threshold, so as to open the pressure relief outlet and release the pressure.

[0027] The above-described implementation method is the core technical solution of this embodiment. By integrating a pressure relief component 5 into the switch housing 1, the pressure relief component 5 includes a pressure relief channel 50 connected to the water channel 11, a movable pressure relief plug 52, and a pressure relief spring 53 that provides pre-tightening force, forming a pressure threshold triggered automatic pressure relief mechanism. When abnormal high pressure is generated in the water channel due to water pump failure, thermal expansion and contraction, water hammer phenomenon, etc., and reaches the preset threshold, the water pressure will push the pressure relief plug 52 to move against the pre-tightening force of the pressure relief spring 53, opening the pressure relief outlet to release excess pressure. This fundamentally avoids the situation of continuous and sudden pressure increase in the pipeline, and completely solves the risk of pipeline leakage and rupture caused by pressure accumulation in existing switches. Since the pressure relief component is directly set inside the switch housing and is not an external device independent of the water switch, compared with the existing technology that requires additional accessories such as pressure relief valves and pressure relief pipes in the pipeline system, this design allows the water switch itself to have both pressure sensing on / off and overpressure relief protection functions, saving installation space, simplifying system layout, and making the product structure more compact.

[0028] The following is combined with Figure 2-4 The specific setup method for the pressure relief component is explained in detail: The pressure relief assembly 5 includes a pressure relief connector 51 threaded onto the switch housing 1, and a pressure relief conduit 54 disposed within the pressure relief connector 51 and communicating with the water channel. The pressure relief channel 6 includes a first flow path 61 disposed within the pressure relief conduit 54 and a main flow path 62 disposed within the pressure relief connector 51. This two-stage flow path of fluid from the first flow path to the main flow path can form a certain pressure buffer during the pressure relief process. A pressure relief outlet is formed at one end of the pressure relief conduit 54 facing the pressure relief plug. The pressure relief plug 52 and the pressure relief spring 53 are connected and disposed within the pressure relief connector 51. The pressure relief plug and the pressure relief spring are integrated within the pressure relief connector. Under normal conditions, the spring preload pushes the pressure relief plug to tightly seal the pressure relief outlet of the pressure relief conduit, achieving zero leakage sealing and preventing abnormal loss of system pressure. In this structural configuration, the pressure relief assembly 5 uses an independent pressure relief connector 51 as a carrier and is connected to the switch housing 1 by threads. The pressure relief plug 52, pressure relief spring 53, and pressure relief conduit 54 can be pre-assembled into a complete assembly in the pressure relief connector 51 before being screwed into the switch housing 1 as a whole, which greatly improves production and assembly efficiency. The use of the threaded independent pressure relief connector 51 realizes modular design, reducing maintenance costs and operation difficulty.

[0029] In a further preferred configuration, the switch housing 1 is provided with a water interface 13 connected to the water channel 11. The pressure relief conduit 54 is truncated cone-shaped, with the pressure relief outlet at the smaller diameter end and the larger diameter end extending into the water interface. The pressure relief plug 52 is slidably disposed in the main flow path relative to the pressure relief conduit 54 and, under the action of the pressure relief spring 53, cooperates to seal the pressure relief outlet of the pressure relief conduit 54. When the water pressure exceeds a preset threshold, the fluid pressure pushes the pressure relief plug to overcome the elastic displacement of the pressure relief spring, opening the pressure relief outlet and allowing the fluid to flow into the main flow path and be discharged. The pressure relief response is rapid and the threshold is controllable. The pressure relief pressure can be precisely adjusted by replacing springs with different stiffnesses to adapt to different working conditions. The first flow path formed within the pressure relief conduit 54 is a tapered flow channel. This tapered flow channel can play a certain throttling role during pressure relief, preventing excessive pressure relief flow from causing a sudden drop in system pressure and maintaining stable water system pressure. In addition, the smaller diameter end of the pressure relief conduit 54 serves as the pressure relief outlet, forming a small-area, high-precision sealing fit with the pressure relief plug 52. The smaller sealing contact area allows for a higher sealing specific pressure under the same spring preload, effectively blocking leakage between the water channel 11 and the pressure relief channel 50 under normal conditions, enhancing sealing reliability and improving leak-proof performance.

[0030] To adjust the preload force applied by the pressure relief spring 53 to the pressure relief plug 52, the pressure relief assembly 5 also includes an adjusting core 55 threaded into the outlet of the pressure relief connector 51. The adjusting core 55 is positioned opposite the pressure relief plug 52. This adjusting core 55 is designed as a hollow structure, forming a complete pressure relief path with the pressure relief channel 50 and the pressure relief conduit 54. One end of the pressure relief spring 53 abuts against the pressure relief plug 52, and the other end abuts against the adjusting core 55. By rotating the adjusting core 55, the preload force applied by the pressure relief spring 53 to the pressure relief plug 52 can be adjusted. This design eliminates the need to disassemble the switch body and pressure relief connector during maintenance; simply unscrewing the adjusting core allows for spring replacement, preload adjustment, or plug repair, significantly reducing maintenance costs and difficulty.

[0031] like Figure 3 As shown, the inner wall of the pressure relief channel 50 is conical, gradually increasing in size from the pressure relief outlet to its outlet. The pressure relief plug 52 is in sealing contact with the conical inner wall of the pressure relief channel 50 when the pressure relief outlet is closed, and disengages from the conical inner wall of the pressure relief channel 50 when it moves away from the pressure relief outlet. An elastic sealing gasket is provided on the side of the pressure relief plug 52 facing the pressure relief conduit 54. The advantage of this design is that the sealing plug can be smoothly guided along the conical surface to the sealing position that matches the pressure relief conduit 54 during assembly. When the water pressure in the water passage 11 is normal, the pressure relief plug 52 forms a conical surface seal with the conical inner wall and simultaneously seals the pressure relief outlet of the pressure relief conduit 54. This structure has a natural self-tightening sealing characteristic, which improves the reliability of the seal. When the sealing plug moves away from the pressure relief outlet under strong water pressure, the cross-section of the pressure relief channel opens gradually, and the pressure relief flow gradually increases from small to large, achieving smooth pressure relief and maintaining stable pressure changes in the water system.

[0032] To address the failure of the automatic pressure relief function and prevent continuous pressure buildup in the water system that could lead to pipe rupture, interface leakage, or even component bursting, the water pressure switch in this embodiment incorporates a manual pressure relief structure on the pressure relief connector 51. (Refer to...) Figure 3-5The manual pressure relief structure includes: a pressure relief sealing gasket 56, a second flow path 63, and a sealing ring 57. The pressure relief sealing gasket 56 is sleeved on one end sidewall of the pressure relief conduit 54 to seal the port of the water interface 13 when the pressure relief connector 51 is threaded. The second flow path 63 is located between the switch housing 1 and the pressure relief connector 51, connecting the water interface 13 and the main flow path 62. The sealing ring 57 is located between the pressure relief connector 51 and the switch housing 1, below the second flow path, to maintain a seal between the second flow path and the external environment during manual pressure relief. When the pressure relief connector 51 is screwed on to move outward relative to the switch housing 1, the pressure relief sealing gasket disengages from sealing the water interface port, allowing the water channel 11 to connect sequentially through the water interface, the second flow path, and the main flow path to achieve manual pressure relief. The manual pressure relief structure using this technical solution is based on the original pressure relief component. It is achieved by adding a second flow path and a seal to the pressure relief connector 51 and the switch housing 1. The structure, installation method and working principle of the automatic pressure relief core component are not changed. It realizes the integration of manual pressure relief function and connector body, which greatly simplifies the overall structure and assembly process of water circuit switch. When the automatic pressure relief component fails to trigger pressure relief, or in scenarios where the water circuit system needs to be manually depressurized, inspected and emptied, the bypass can be forcibly opened by turning the pressure relief connector. That is, the water circuit channel and the main flow are connected through the second water circuit, which can quickly complete the active pressure relief operation, improve the convenience of use and maintenance, and the operation does not require any tools. It solves the risk of pressure buildup in the water circuit system, and at the same time adapts to the working conditions of rapid pressure relief and inspection on site, which greatly improves the fault tolerance rate and operational safety of the entire water circuit system.

[0033] For further optimization settings, refer to Figure 5 The second flow path 63 includes a pressure relief bypass 64 axially disposed on the threaded portion of the pressure relief connector 51, and a side pressure relief port 65 radially penetrating the pressure relief connector 51 and communicating with the main flow path. The side pressure relief port 65 is connected to the lower end of the pressure relief bypass 64. In this structural configuration, the second flow 63 consists of a pressure relief bypass and a side pressure relief port located on the pressure relief connector. By directly integrating the pressure relief bypass on the pressure relief connector 61 and using a pressure relief sealing gasket, a sealing isolation is achieved under normal conditions. When the pressure relief connector is screwed off from the water interface, the high-pressure water in the water channel flows along the pressure relief bypass on the threaded section of the pressure relief connector, and then turns through the side pressure relief port on the pressure relief connector to merge into the main flow of the pressure relief channel, allowing the water to continue flowing along the pressure relief channel. Finally, it is discharged through a preset outlet to complete the pressure relief, thus forming a manual pressure relief path that sequentially connects the water interface, the pressure relief bypass, the side pressure relief port, and the main flow of the pressure relief channel. This manual pressure relief path is an emergency passage independent of the automatic pressure relief component, with strong emergency pressure relief capability, ensuring the safety of the water system.

[0034] Combination Figure 1 and Figure 3 As shown, an anti-detachment structure is provided between the switch housing 1 and the pressure relief connector 51. The anti-detachment structure includes: a connecting part 14, a limiting boss 58, and a U-shaped locking member 7. The connecting part 14 is disposed on the switch housing and has an internal thread structure for connecting to the pressure relief connector 51. The limiting boss is formed on the outer peripheral sidewall of the pressure relief connector 51. An annular groove for accommodating the sealing ring is formed on the limiting boss 14. The sealing ring is in sealing contact with the inner wall of the connecting part. The U-shaped locking member 7 is detachably installed on the connecting part 14 and passes through the interior of the connecting part, and is arranged vertically opposite to the limiting boss. When the pressure relief connector 51 is screwed to a preset position, the U-shaped locking member 7 abuts against the limiting boss 58 to restrict the axial movement of the pressure relief connector 51 relative to the switch housing 1. The anti-detachment structure designed in this embodiment can specifically prevent the pressure relief connector from loosening and falling off during manual pressure relief operations. Through the axial limiting cooperation of the U-shaped locking piece and the limiting boss, it effectively restrains the axial movement and tendency to fall off during the pressure relief adjustment process of the pressure relief connector 51, avoiding the loosening of threads and the detachment of the connector due to repeated tightening operations, and ensuring continuous and stable manual pressure relief operations. At the same time, it can prevent the connector from accidentally falling off during the pressure relief process, which may cause water splashing and sudden loss of system pressure, ensuring the safety and controllability of the pressure relief operation. With the threaded connection of the connecting part, the pressure relief connector remains firmly assembled even under repeated manual tightening conditions, improving the operational reliability and durability of the manual pressure relief structure. It takes into account both the anti-detachment effect and the sealing reliability. The overall structure is compact and easy to disassemble and assemble, and is suitable for daily pressure relief maintenance of high-pressure water systems.

[0035] The following is combined with Figure 1-4 The specific structure of the switch module is described in detail below: The switch module includes a connector 8, a drive assembly, and a contact assembly. The connector 8 is connected to the switch housing 1 and together with the switch housing 1 forms the electrical cavity 12. The connector 8 is connected to one end of the water channel 11. The drive assembly includes a drive diaphragm 2, a transmission disk 3, and a return spring 4. The drive diaphragm 2 is sealed between the electrical cavity 12 and the water channel 11, isolating the electrical cavity 12 and the water channel 11 from each other. The transmission disk 3 is connected to the drive diaphragm 2 and the water channel 11. The contact assemblies are used to transmit the deformation force of the drive diaphragm 2; the return spring 4 is disposed between the connector seat 8 and the transmission disk 3, and applies an elastic force to the transmission disk 3 to move towards one side of the drive diaphragm 2; the drive assembly is used to respond to the deformation of the drive diaphragm 2 caused by the change in water pressure in the water channel 11; the contact assembly is housed in the electrical cavity 12, and the contact assembly includes an annular movable contact that is linked to the drive assembly, and two contacts disposed on the connector seat 8 and opposite to the movable contact 6. Each stationary contact 7 has two terminal protrusions extending from the connector seat 8. The transmission disc 3 has a guide groove 31 on the side facing the connector seat 8. The connector seat 8 has a guide post 81 connected to the guide groove 31. The transmission disc 3 is slidably mounted on the guide post 81 via the guide groove 31. The two work together to form a linear sliding guide mechanism, which strictly limits the transmission disc 3 to move only along the axial direction of the driving diaphragm 2. The return spring 4 applies an elastic force to the transmission disc 3, causing it to move towards the driving diaphragm 2. This guide mechanism... The design ensures that the elastic deformation force of the driving diaphragm and the elastic force of the return spring are transmitted axially. Since the transmission disk 3 is in close contact or fixedly connected to the central area of ​​the driving diaphragm 2, when the water pressure in the water channel increases, the elastic deformation force of the driving diaphragm 2 is stably and synchronously transmitted to the transmission disk 3, avoiding force dispersion or action delay caused by edge deformation, and making the on / off trigger pressure of the switch more precise and consistent. Driven by the elastic deformation of the driving diaphragm 2, the transmission disk 3 drives the moving contact 91 to move closer to the stationary contact 92, realizing the conductive contact between the moving and stationary contacts.

[0036] like Figure 4As shown, the connector seat 8 has a guide hole 81 extending through it axially. The transmission disk 3 includes a guide post 31 that slides with the guide hole 81. The guide post 31 has a positioning hole for installing a reset spring. An adjusting nut 9 is threaded into the guide hole 81. The adjusting nut 9 is threaded into the inner wall of the guide hole 31. One end of the reset spring 4 extends into the guide hole 31 and abuts against the adjusting nut 9, while the other end abuts against the transmission disk 3. By turning the adjusting nut 9, the elastic force applied by the reset spring 4 to the transmission disk 3 is adjusted, thereby precisely adjusting the trigger pressure of the control water pressure switch. The positioning hole of the guide post also serves to position and guide the reset spring 4, reducing the overall installation space, simplifying the assembly process, and achieving modular pre-assembly and efficient installation.

[0037] While the switch module of this invention preferably employs the aforementioned mechanical contact method, it can also utilize an electronic magnetic induction non-contact method. Both methods can respond to changes in water pressure within the water channel to achieve circuit on / off control. The following supplements the implementation of the electronic magnetic induction switch module. The structure, installation, and working principle of the pressure relief component of the water channel remain unchanged; only the signal sensing and circuit on / off structure of the switch module are replaced. Preferably, an electronic magnetic induction non-contact method using a Hall sensor is adopted, eliminating the mechanical moving and stationary contact components. Specifically, the electronic switch module includes a connector, a drive diaphragm, a transmission push rod, a return spring, and a circuit board and Hall sensor housed within the connector. The transmission push rod is equipped with a magnetic component that cooperates with the Hall sensor. Relying on the direct linkage between the drive diaphragm and the elastic push rod, combined with the non-contact magnetic induction triggering method of the magnetic component and the Hall sensor, it can accurately respond to changes in water pressure and output a stable electrical signal, achieving non-mechanical contact circuit on / off control. This effectively improves the service life, wear resistance, and operational stability of the switch module, adapting to high-precision, long-life water channel control conditions.

[0038] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A water pressure switch with pressure relief function, comprising a water circuit body and a switch module, wherein the water circuit body includes a switch housing (1) having a water circuit channel (11) and a pressure relief component (5) disposed in the switch housing (1), characterized in that: The pressure relief assembly (5) includes: A pressure relief channel (6) is provided on the switch housing (1), and the pressure relief channel (6) has a pressure relief outlet that communicates with the water passage (11); A pressure relief plug (52) is movably disposed within the pressure relief channel (6) for closing or opening the pressure relief outlet; A pressure relief spring (53) is disposed in the pressure relief channel (6) and applies a pre-tightening force to the pressure relief plug (52) in the direction of closing the pressure relief outlet; the pressure relief plug (52) is used to move against the pre-tightening force when the water pressure in the water channel (11) reaches a preset threshold, so as to open the pressure relief outlet and release pressure.

2. The water pressure switch with pressure relief function according to claim 1, characterized in that: The pressure relief assembly (5) includes a pressure relief connector (51) threaded onto the switch housing (1) and a pressure relief conduit (54) disposed within the pressure relief connector (51) and communicating with the water passage; the pressure relief passage (6) includes a first flow path (61) disposed within the pressure relief conduit (54) and a main flow path (62) disposed within the pressure relief connector (51); a pressure relief outlet is formed at one end of the pressure relief conduit (54) facing the pressure relief plug, and the pressure relief plug (52) and the pressure relief spring (53) are connected and disposed within the pressure relief connector (51).

3. The water pressure switch with pressure relief function according to claim 2, characterized in that: The switch housing (1) is provided with a water interface (13) connected to the water channel (11). The pressure relief conduit (54) is truncated cone-shaped. The smaller diameter end of the pressure relief conduit (54) is provided with the pressure relief outlet, and the larger diameter end extends into the water interface. The pressure relief plug (52) is slidably disposed in the main flow path relative to the pressure relief conduit (54) and, under the action of the pressure relief spring (53), cooperates to seal the pressure relief outlet of the pressure relief conduit (54).

4. The water pressure switch with pressure relief function according to claim 3, characterized in that: The pressure relief connector (51) is provided with a manual pressure relief structure, which includes: A pressure relief sealing gasket (56) is fitted onto one end sidewall of the pressure relief conduit (54) to seal the port position of the water interface (13) when the pressure relief connector (51) is threaded. The second flow path (63) is disposed between the switch housing (1) and the pressure relief connector (51) for connecting the water interface (13) and the main flow path (62); A sealing ring (57) is disposed between the pressure relief connector (51) and the switch housing (1) and located on the lower side of the second flow path, for maintaining the seal between the second flow path and the external environment during manual pressure relief; When the pressure relief connector (51) is screwed on to move outward relative to the switch housing (1), the pressure relief sealing gasket is released from the seal on the water interface port, so that the water channel (11) is connected to the main channel in sequence through the water interface and the second flow path to achieve manual pressure relief.

5. The water pressure switch with pressure relief function according to claim 4, characterized in that: The second flow path (63) includes a pressure relief bypass (64) axially disposed on the threaded portion of the pressure relief connector (51), and a side pressure relief port (65) radially penetrating the pressure relief connector (51) and communicating with the main flow path, the side pressure relief port (65) being connected to the lower end of the pressure relief bypass (64).

6. The water pressure switch with pressure relief function according to claim 4, characterized in that: An anti-detachment structure is provided between the switch housing (1) and the pressure relief connector (51), the anti-detachment structure comprising: The connecting part (14) is provided on the switch housing (1) and has an internal thread structure that connects to the pressure relief connector (51); A limiting boss (58) is formed on the outer peripheral sidewall of the pressure relief connector (51). An annular groove for accommodating the sealing ring (57) is formed on the limiting boss (14). The sealing ring (57) is in sealing contact with the inner wall of the connecting part (14). The U-shaped locking piece (7) is detachably installed on the connecting part (14) and passes through the interior of the connecting part and is arranged vertically opposite to the limiting boss (58).

7. The water pressure switch with pressure relief function according to claim 4, characterized in that: The pressure relief assembly (5) further includes an adjusting core (55) threaded into the outlet of the pressure relief connector (51). The adjusting core (55) is hollow and is disposed opposite to the pressure relief plug (52). One end of the pressure relief spring (53) abuts against the pressure relief plug (52), and the other end abuts against the adjusting core (55). The adjusting core (55) is rotated to adjust the preload applied by the pressure relief spring (53) to the pressure relief plug (52).

8. The water pressure switch with pressure relief function according to claim 4, characterized in that: The inner wall of the main flow path (62) is conical, gradually increasing in size from the pressure relief outlet to its outlet. The pressure relief plug (52) is in sealing contact with the conical inner wall of the pressure relief channel (6) when the pressure relief outlet is closed, and disengages from the conical inner wall of the pressure relief channel (6) when it moves away from the pressure relief outlet. An elastic sealing gasket is provided on the side of the pressure relief plug (52) facing the pressure relief conduit (54).

9. The water pressure switch with pressure relief function according to claim 2, characterized in that: The switching module includes: Connector base (8) is connected to the switch housing (1) and together with the switch housing (1) forms an electrical cavity (12); The drive assembly includes a drive diaphragm (2) sealed between the electrical cavity (12) and the water channel (11), the drive diaphragm (2) isolating the electrical cavity (12) and the water channel (11) from each other, and the drive assembly is used to operate in response to the deformation of the drive diaphragm (2) caused by changes in water pressure in the water channel (11); The contact assembly is housed within the electrical cavity (12). The contact assembly includes an annular moving contact that is linked to the drive assembly, and two stationary contacts disposed on the connector seat (8) and opposite to the moving contact (6). The two stationary contacts (7) have two terminals extending out of the connector seat (8).

10. The water pressure switch with pressure relief function according to claim 9, characterized in that: The driving component includes: The transmission disk (3) is connected between the drive diaphragm (2) and the contact assembly, and is used to transmit the deformation force of the drive diaphragm (2); A return spring (4) is disposed between the connector seat (8) and the transmission disk (3) and applies an elastic force to the transmission disk (3) to move toward the drive diaphragm (2). The connector seat (8) has a guide hole (81) extending through it along the axial direction. The transmission disk (3) includes a guide post (31) that slides with the guide hole (81). The guide post (31) has a positioning hole for installing a reset spring. An adjusting nut (9) is threaded into the guide hole (81). One end of the reset spring (4) abuts against the adjusting nut (9), and the other end abuts against the transmission disk (3). The elastic force of the reset spring (4) is adjusted by turning the adjusting nut (9).

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