A pressure-adjustable pressure relief valve

Abstract

This invention relates to the field of valve technology, specifically to a pressure-adjustable pressure relief valve, comprising a pressure-relieving valve body and a transmission assembly. The pressure-relieving valve body includes a valve body with a valve cavity. A valve seat is fixedly inserted into the valve cavity, dividing the valve cavity into an inlet cavity and an outlet cavity. The valve seat has a valve port connecting the inlet and outlet cavities, and the valve port has a first sealing ring conical surface with its smaller opening facing the outlet cavity. A valve stem is inserted into the valve cavity and is slidable along its extension direction. A valve disc is provided on the valve stem to control the opening and closing of the valve port. The valve disc has a second sealing ring conical surface and can form a sealing fit with the first sealing ring conical surface. Multiple circumferentially arranged blocking parts are hinged to the valve stem. Under the action of the transmission assembly, the blocking parts can rotate around their hinge points to block the second sealing ring conical surface after the pressure-adjustable pressure relief valve is opened. This achieves protection for both the first and second sealing ring conical surfaces.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a pressure-adjustable pressure relief valve. Background Technology

[0002] A pressure relief and holding valve is a type of valve used in water supply systems. Its main function is to maintain stable pipeline pressure through a dual mode of pressure relief or holding, preventing overpressure from damaging the equipment.

[0003] In related technologies, such as Chinese patent CN214368017U, a pressure relief and sustaining valve is disclosed. This valve includes a valve body, a valve stem, a valve cover, and a valve assembly. The valve body and valve cover are connected to form a valve cavity. The valve stem is inserted into the valve cavity. The valve assembly is mounted on the valve stem and divides the valve cavity into a control cavity and a flow cavity. The flow cavity has an inlet cavity, an outlet cavity, and a valve seat. The valve assembly includes a valve disc. In use, under the pressure difference between the control cavity and the flow cavity, and the pressure difference on both sides of the valve disc, the valve assembly and the valve stem can move axially, causing the valve disc to move axially closer to or further away from the valve seat, thereby realizing the opening and closing of the inlet cavity and the outlet cavity.

[0004] However, the aforementioned pressure relief and sustaining valve also has some problems in actual use: Firstly, when the pressure relief and sustaining valve is in the open state, the water flows from the inlet chamber to the outlet chamber at high speed. During this process, the water flow will directly and continuously impact the sealing surfaces of the valve disc and the valve seat. Due to the large kinetic energy carried by the high-speed water flow, and the fact that the water may contain small particles, the impact effect will be aggravated. After long-term operation, the sealing surfaces of the valve disc and the valve seat are prone to gradually forming honeycomb-like pits. These pits will damage the flatness of the sealing surfaces, making it impossible for the sealing surfaces to achieve effective contact, ultimately causing the sealing failure problem, resulting in pipeline pressure loss or media leakage.

[0005] Secondly, the water flow in the water supply system inevitably contains impurities such as silt, rust, and pipe debris. These impurities tend to adhere to the sealing surface of the valve disc during water flow. When the valve is closed, the valve disc moves towards the valve seat and comes into contact with it. At this time, the impurities adhering to the sealing surface of the valve disc are squeezed between the sealing surfaces of the valve disc and the valve seat. On the one hand, these impurities act like abrasives, causing scraping and wear on the two sealing surfaces during the opening and closing of the valve, significantly shortening the service life of the sealing surfaces. On the other hand, the presence of impurities will hinder the tight fit of the sealing surfaces, forming tiny gaps, resulting in a decrease in sealing effect and making it very easy for media leakage to occur, affecting the stable control of pipeline pressure. Summary of the Invention

[0006] Therefore, it is necessary to provide a pressure relief valve with adjustable pressure to address the problem of poor reliability of current pressure relief and sustaining valves.

[0007] The above objectives are achieved through the following technical solutions: An adjustable pressure relief valve includes a pressure relief and holding valve body and a transmission assembly. The pressure relief and holding valve body includes a valve body with a valve cavity. A valve seat is fixedly inserted into the valve cavity, dividing the valve cavity into an inlet cavity and an outlet cavity. A valve port is provided on the valve seat, connecting the inlet cavity and the outlet cavity. The valve port has a first sealing ring conical surface, with the small end of the first sealing ring conical surface facing the outlet cavity. A valve stem is inserted into the valve cavity. The valve stem is slidable along its extension direction. A valve disc is provided on the valve stem. The valve disc is configured to control the opening and closing of the valve port. The valve disc has a second sealing ring conical surface, which can form a sealing fit with the first sealing ring conical surface. Multiple blocking parts are hinged on the valve disc. The multiple blocking parts are arranged circumferentially, and under the action of the transmission assembly, the blocking parts can rotate around their own hinge point to block the second sealing ring conical surface after the pressure-adjustable relief valve is opened.

[0008] Furthermore, the transmission assembly includes a sliding ring, which is sleeved on the valve stem and can form a stop engagement with the valve body. The two end faces of the sliding ring are respectively connected to the valve stem through two first elastic elements. Under the action of the first elastic elements, the sliding ring can slide elastically along its own axis. The sliding ring is provided with a plurality of racks, which extend in a direction parallel to the axis of the sliding ring and are arranged circumferentially. Each of the blocking parts is provided with a gear, the axis of which coincides with the hinge point of the blocking part, and the gear meshes with the rack.

[0009] Furthermore, the first elastic element is a first compression spring.

[0010] Furthermore, each of the shielding parts has a cavity, and a sliding member is inserted into each cavity. The sliding member and the shielding part form a piston-like engagement. A rotating shaft is threaded into each sliding member. The rotating shaft and the sliding member can slide relative to each other along the axial direction. The valve seat has multiple irregularly shaped grooves arranged circumferentially. Each rotating shaft is provided with an irregularly shaped member. The shape of the irregularly shaped member is the same as the shape of the irregularly shaped groove and can pass through the irregularly shaped groove. Adjacent irregularly shaped members can form a stop engagement. The sliding member is connected to the shielding part through a second elastic member.

[0011] Furthermore, the cavity is filled with damping fluid.

[0012] Furthermore, the damping fluid is air.

[0013] Furthermore, the second elastic element is a second compression spring.

[0014] Furthermore, the blocking part is connected to the valve disc via a third elastic member, and under the action of the third elastic member, the blocking part can elastically rotate around its own hinge point.

[0015] Furthermore, the third elastic element is a torsion spring.

[0016] Furthermore, the pressure-adjustable relief valve also includes a pressure gauge configured to detect the water pressure within the valve body.

[0017] The beneficial effects of this invention are: This invention relates to a pressure-adjustable relief valve. By incorporating a first sealing ring conical surface, its structural characteristics prevent water flow from impacting the first sealing ring conical surface when it enters the outlet chamber from the inlet chamber. Furthermore, by providing a shielding part and a cooperating transmission component, the shielding part can block the second sealing ring conical surface after the pressure-adjustable relief valve is opened, preventing water flow from impacting it. This improves the sealing performance by reducing the formation of honeycomb-like pits on both the first and second sealing ring conical surfaces. It also reduces the adhesion of impurities to the second sealing ring conical surface, decreasing wear caused by impurities and improving the fit between them, thus enhancing the reliability of the pressure-adjustable relief valve.

[0018] Furthermore, by setting up a sliding element and a damping fluid, and setting up a rotating shaft and a second elastic element to cooperate with them, a damping structure is formed. During the frequent opening and closing of the pressure-adjustable relief valve, it can reduce the vibration of the valve stem and valve disc, thereby reducing the wear between the components and improving the service life of the pressure-adjustable relief valve. Attached Figure Description

[0019] Figure 1 A three-dimensional structural schematic diagram of a pressure-adjustable pressure relief valve provided in an embodiment of the present invention; Figure 2 An exploded view of the components of a pressure-adjustable relief valve provided in an embodiment of the present invention; Figure 3 A top view of the pressure-adjustable relief valve provided in an embodiment of the present invention; Figure 4 for Figure 3 Sectional view along the AA direction; Figure 5 for Figure 3 Sectional view along the BB direction; Figure 6 for Figure 5Enlarged structural diagram of part W in the middle Figure 7 An exploded view of some components of the pressure-adjustable relief valve provided in an embodiment of the present invention; Figure 8 for Figure 7 A magnified schematic diagram of the structure at point X in the middle; Figure 9 An exploded view of the components of the pressure-adjustable relief valve provided in an embodiment of the present invention, including the shielding part, the sliding part, the rotating shaft, the second compression spring, and the coil spring. Figure 10 The working principle of the pressure-adjustable relief valve provided in the embodiments of the present invention Figure 1 ; Figure 11 for Figure 10 A magnified schematic diagram of the structure at point Y in the middle; Figure 12 The working principle of the pressure-adjustable relief valve provided in the embodiments of the present invention Figure 2 ; Figure 13 for Figure 12 A magnified schematic diagram of the structure at point Z in the middle.

[0020] in: 1. Pressure relief and sustaining valve body; 11. Main valve; 111. Valve body; 1111. Inlet water chamber; 1112. Outlet water chamber; 1113. Baffle; 112. Valve cover; 1121. Control chamber; 113. First diaphragm; 114. Valve seat; 1141. Valve port; 11411. First sealing ring conical surface; 1142. Irregular groove; 115. Valve stem; 1151. Lower pressure plate; 1152. Valve disc; 11521. Second sealing ring conical surface; 11522. Solid... 1153. Fixed protrusion; 1154. Annular groove; 116. Upper pressure plate; 1161. Fixing nut; 117. Third compression spring; 12. Pilot valve; 121. Base; 122. Sleeve; 123. Adjusting screw; 124. Adjusting nut; 125. Valve core; 126. Second diaphragm; 127. Fourth compression spring; 128. Gasket; 13. Needle valve; 14. Connecting pipe; 141. First inlet pipe; 142. Second inlet pipe; 143. Outlet pipe; 144. Third inlet pipe; 2. Transmission assembly; 201. Sliding ring; 202. First compression spring; 203. Rack; 204. Gear; 2041. Slide groove; 3. Shielding part; 301. Cavity; 302. Retaining ring; 4. Sliding component; 401. Insert rod; 4011. Piston ring; 402. Base; 5. Shaft; 501. Irregularly shaped parts; 6. Second compression spring; 7. Coil spring; 8. Pressure gauge. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They 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, and therefore should not be construed as limiting the invention.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] The following reference Figures 1 to 13 The present invention describes a pressure-adjustable pressure relief valve provided in an embodiment of the invention, which is particularly suitable for use in water supply systems.

[0025] Specifically, the pressure-adjustable relief valve is configured to include a pressure relief and holding valve body 1, which includes a main valve 11, a pilot valve 12, a needle valve 13, and a connecting pipe 14. The main valve 11 includes a valve body 111, which is a tee-like tubular structure with one port facing upwards and the other two ports arranged horizontally along the front-back direction. A valve cover 112 is provided at the top port of the valve body 111. The valve cover 112 is a hemispherical shell-like structure and is fixedly connected to the valve body 111 by bolts, forming a valve cavity together with the valve body 111. A first diaphragm 113 is sandwiched between the valve cover 112 and the valve body 111, which laterally divides the valve cavity into an upper control cavity 1121 and a lower valve cavity. The valve cavity is simultaneously connected to the three ports on the valve body 111. A valve stem 115 is inserted into the valve cavity, and the valve stem 115 extends along... Extending vertically and movable in the vertical direction, its top end penetrates the first diaphragm 113 from bottom to top. A lower pressure plate 1151 is integrally formed on the valve stem 115. The surface of the lower pressure plate 1151 is horizontally set and supports the bottom of the first diaphragm 113 during installation. An upper pressure plate 116 is sleeved on the valve stem 115. The surface of the upper pressure plate 116 is horizontally set and presses against the top of the first diaphragm 113. A fixing nut 1161 is fixed on the top of the upper pressure plate 116. The fixing nut 1161 is threaded onto the valve stem 115 during installation, so that the first diaphragm 113 can be fixed to the valve stem 115 by the fixing nut 1161, the upper pressure plate 116, and the lower pressure plate 1151.

[0026] Inside the valve cavity, a valve seat 114 is integrally formed with the valve body 111. The valve seat 114 divides the valve cavity into an inlet water cavity 1111 and an outlet water cavity 1112. A valve port 1141 is provided on the valve seat 114, which connects the inlet water cavity 1111 and the outlet water cavity 1112. A valve disc 1152 is integrally formed at the bottom of the valve stem 115. The valve disc 1152 can be inserted into the valve port 1141 to control the opening and closing of the valve port 1141. A third compression spring 117 is inserted into the control cavity 1121. The third compression spring 117 extends vertically and is sleeved on the outer periphery of the valve stem 115. Its top abuts against the top of the inner spherical surface of the valve cover 112, and its bottom abuts against the upper pressure plate 116.

[0027] The pilot valve 12 includes a base 121, which is mounted on top of the valve cover 112 and fixedly connected to the valve cover 112 by bolts. The base 121 has a three-way housing structure. The top of the valve cover 112 has an opening that connects the base 121 and the control chamber 1121. A sleeve 122 is bolted to the top of the base 121. The sleeve 122 is vertically oriented and open at the bottom. An adjusting screw 123 is inserted through the top of the sleeve 122, forming a threaded engagement with the sleeve 122. An adjusting nut 124 is threaded onto the adjusting screw 123, forming a stop engagement with the sleeve 122 to adjust the insertion of the adjusting screw 123 into the sleeve 122. 2. Internal depth; A valve core 125 is inserted into the sleeve 122. A second diaphragm 126 is fixed to the top of the valve core 125 by a structure similar to that of the fixing nut 1161, the upper pressure plate 116, and the lower pressure plate 1151. The second diaphragm 126 divides the interior of the sleeve 122 into two non-communicating chambers along the axial direction. A fourth compression spring 127 is inserted into the upper chamber of the sleeve 122. The fourth compression spring 127 extends vertically and its bottom abuts against the top of a structure similar to the upper pressure plate 116. A gasket 128 is provided on the top of the fourth compression spring 127. The bottom end of the adjusting screw 123 abuts against the top of the gasket 128 to adjust the compression degree of the fourth compression spring 127, thereby adjusting the pressure of the main valve 11.

[0028] The connecting pipe 14 includes a first inlet pipe 141, a second inlet pipe 142, and an outlet pipe 143. The first inlet pipe 141 connects the inlet water chamber 1111 and the control chamber 1121, facilitating the introduction of water from the inlet water chamber 1111 into the control chamber 1121. A needle valve 13 is disposed on the first inlet pipe 141 and is used to control the water flow rate. The second inlet pipe 142 connects the inlet water chamber 1111 and the base 121, and extends to the lower part of the second diaphragm 126, facilitating the introduction of water from the inlet water chamber 1111 into the sleeve. The cylinder 122 is located in the lower chamber, so that when the water pressure in the inlet chamber 1111 increases, the valve core 125 can be pushed upward; the outlet pipe 143 connects the outlet chamber 1112 and the base 121, and extends to the lower part of the second diaphragm 126, so as to facilitate the drainage of water in the control chamber 1121 into the outlet chamber 1112; the valve core 125 is used to control the opening and closing of the outlet pipe 143. When the valve core 125 moves upward, the inlet of the outlet pipe 143 is connected to the base 121, so as to facilitate the drainage of water in the control chamber 1121.

[0029] Initially, valve disc 1152 closes valve port 1141, and valve core 125 blocks the inlet of water outlet pipe 143.

[0030] During operation, water is first introduced into the inlet water chamber 1111 at a certain pressure. The water entering the inlet water chamber 1111 flows in three directions: one direction flows through the first inlet pipe 141, through the needle valve 13, and into the control chamber 1121; another direction flows into the second inlet pipe 142; and the last direction pushes the valve disc 1152 upward, opening the valve port 1141, and then flows into the outlet water chamber 1112 through the valve port 1141. The third pressure spring 117 is compressed, and the valve disc 1152 simultaneously moves the valve stem 115 upward, simultaneously lifting the first diaphragm 113 upward. After the control chamber 1121 is filled with water, the water pressure in the control chamber 1121 is equal to the water pressure in the inlet water chamber 1111. Under the action of the third pressure spring 117, the valve disc 1152 moves downward, closing the valve port 1141. The valve disc 1152 simultaneously moves the valve stem 115 downward, and the first diaphragm 113 returns to its original position.

[0031] When the water pressure in the inlet chamber 1111 increases, the water entering the second inlet pipe 142 pushes the valve core 125 upward, opening the inlet of the outlet pipe 143. At this time, the water in the control chamber 1121 can be discharged into the outlet chamber 1112 through the outlet pipe 143, achieving pressure relief. The fourth spring 127 is compressed, and the valve core 125 simultaneously pushes the second diaphragm 126 upward. Subsequently, the water pushes the valve disc 1152 upward, opening the valve port 1141, and then enters the outlet chamber 1112 through the valve port 1141. The third spring 117 is compressed, and the above process is repeated. When the water in the control chamber 1121 is released to a certain extent, under the action of the fourth spring 127, the valve core 125 moves downward, closing the inlet of the outlet pipe 143, and the second diaphragm 126 returns to its original position.

[0032] However, when valve disc 1152 is in the open state, water flows at high speed from the inlet water chamber 1111 to the outlet water chamber 1112. During this process, the high-speed water flow will directly and continuously act on the sealing surface of valve disc 1152 and valve seat 114. Due to the high kinetic energy of the water flow and the small particles that may be contained in the water, the impact effect will be further enhanced. After long-term operation, honeycomb-like pits are likely to gradually form on the sealing surface of valve disc 1152 and valve seat 114. These pits will damage the flatness of the sealing surface, making it impossible for the sealing surfaces to fit effectively, eventually causing sealing failure, which in turn causes pipeline pressure loss or media leakage.

[0033] In addition, the water flow in the water supply system inevitably contains impurities such as silt, rust, and pipe debris. These impurities easily adhere to the sealing surface of the valve disc 1152 during water flow. When the valve disc 1152 is closed, it approaches the valve seat 114 and fits against it. At this time, the impurities attached to the sealing surface of the valve disc 1152 are squeezed between the two sealing surfaces. On the one hand, these impurities act like abrasives, causing scraping and wear on the sealing surfaces during valve opening and closing, significantly shortening the service life of the sealing surfaces. On the other hand, the presence of impurities hinders the tight fit of the sealing surfaces, forming tiny gaps, leading to a decrease in sealing effect, easy leakage of media, and affecting the stable control of pipeline pressure.

[0034] Based on this, in the pressure-adjustable pressure relief valve provided in the embodiment of the present invention, the valve port 1141 is configured to have a first sealing ring conical surface 11411. The first sealing ring conical surface 11411 is located on the outer periphery of the valve port 1141, and the small end faces the water outlet chamber 1112. During the process of water flowing from the water inlet chamber 1111 through the valve port 1141 into the water outlet chamber 1112, since the first sealing ring conical surface 11411 is located on the back side due to its structural design, the high-speed water flow mainly moves from bottom to top along the positive channel of the valve port 1141, and will not directly scour the first sealing ring conical surface 11411. This fundamentally avoids the first sealing ring conical surface 11411 from directly contacting and impacting the high-speed water flow and particles that may be contained in the water. As a result, the phenomenon of honeycomb-like pits forming on the cone surface 11411 of the first sealing ring due to continuous impact after long-term use is effectively improved, and its surface flatness is maintained, thereby ensuring reliable contact with the sealing surface of the valve disc 1152 and providing a stable guarantee for the sealing performance of the valve.

[0035] The valve disc 1152 has a second sealing ring conical surface 11521, with the small end of the second sealing ring conical surface 11521 facing upwards, and capable of forming a sealing fit with the first sealing ring conical surface 11411; multiple blocking parts 3 are hinged on the valve disc 1152, and the multiple blocking parts 3 are arranged circumferentially. The blocking part 3 is fan-shaped with the large end facing upwards, and the outer side wall is an inwardly concave arc surface, and the inner side wall is an inwardly convex arc surface; the pressure-adjustable pressure relief valve is configured to also include a transmission assembly 2, under the action of the transmission assembly 2, the blocking part... The baffle 3 can rotate around its hinge point. After the pressure relief valve with adjustable pressure is opened, the splicing of multiple baffles 3 forms a complete conical ring structure. The upper conical surface of the conical ring structure protrudes upward and fits against the second sealing ring conical surface 11521, so as to block the second sealing ring conical surface 11521. This effectively prevents the high-speed water flow from directly contacting the second sealing ring conical surface 11521 and avoids the impact of the water flow and particles that may be contained in the water on the second sealing ring conical surface 11521.

[0036] From the perspective of sealing surface protection, on the one hand, it can significantly reduce the risk of honeycomb-like pits forming on the second sealing ring conical surface 11521 due to long-term impact, maintaining its surface flatness to ensure sealing effect; on the other hand, it can reduce the probability of impurities adhering to the second sealing ring conical surface 11521, thereby reducing the situation where impurities are squeezed between the first sealing ring conical surface 11411 and the second sealing ring conical surface 11521 when the valve is closed. This not only reduces the scratching and wear of impurities on the two sealing surfaces, extending their service life, but also improves the tightness of the fit between the sealing surfaces, reducing leakage problems caused by gaps, and ultimately improving the overall reliability of the pressure-adjustable relief valve. Exemplarily, the number of shielding parts 3 can be eight, evenly distributed circumferentially.

[0037] Furthermore, an annular groove 1153 is formed on the valve stem 115; the transmission assembly 2 is configured to include a sliding ring 201, which is sleeved in the annular groove 1153 and can slide along its own axis; a stop 1113 is provided on the inner wall of the valve body 111, and the sliding ring 201 is located below the stop 1113 and can form a stop with the stop 1113, thereby limiting the extreme position of the upward movement of the sliding ring 201; on the valve stem 115, two first compression springs 202 are sleeved in the annular groove 1153, and the two first compression springs 202 are respectively located on the sliding ring. The upper and lower sides of the sliding ring 201, both of which form a stop with the valve stem 115 and the sliding ring 201, can be suspended on the ring groove 1153 under the support of the two first compression springs 202. Multiple racks 203 are integrally formed at the bottom of the sliding ring 201, extending parallel to the axis of the sliding ring 201, and arranged circumferentially. A gear 204 is integrally formed at the top of each blocking part 3, with its axis coinciding with the hinge point of the blocking part 3 and meshing with the rack 203. The blocking part 3 is inclined relative to the gear 204. When there are eight blocking parts 3, there are correspondingly eight racks 203 and eight gears 204, all evenly arranged circumferentially.

[0038] It is understandable that the stop 1113 can be set as a ring structure and coaxially set with the sliding ring 201 to ensure the uniformity of the force on the sliding ring 201 when the stop is formed.

[0039] Initially, such as Figure 4 , Figure 5 and Figure 6 As shown, the shielding part 3 is arranged vertically, tilting outward from bottom to top.

[0040] During the upward movement of valve disc 1152, valve disc 1152 synchronously drives sliding ring 201 and blocking part 3 to move upward together. At this time, rack 203 and gear 204 are relatively stationary, and blocking part 3 does not rotate. When sliding ring 201 moves to stop at stop plate 1113, rack 203 remains stationary, and blocking part 3 continues to move upward with valve disc 1152. At this time, gear 204 moves upward relative to rack 203. Under meshing action, gear 204 drives blocking part 3 to rotate inward. When valve disc 1152 moves into position, blocking part 3 rotates a total of 90 degrees. Figure 12 and Figure 13 As shown, the splicing of multiple shielding parts 3 forms a complete conical ring structure, and the upper conical surface of the conical ring structure protrudes upward and fits against the conical surface 11521 of the second sealing ring, so as to shield the conical surface 11521 of the second sealing ring. During the upward movement of the valve disc 1152 relative to the sliding ring 201, the upper first compression spring 202 is released, and the lower first compression spring 202 is compressed.

[0041] During the downward movement of valve disc 1152, supported by the first compression spring 202 located below, sliding ring 201 and rack 203 remain stationary. Valve disc 1152 synchronously drives the blocking part 3 to move downward together. At this time, gear 204 moves downward relative to rack 203. Under meshing action, gear 204 drives the blocking part 3 to rotate outward, thereby achieving reset. After the blocking part 3 is reset, both first compression springs 202 are reset, and valve disc 1152 synchronously drives sliding ring 201 and blocking part 3 to move downward together, thereby achieving reset.

[0042] In a further embodiment, some water supply systems exhibit two prominent problems that significantly impact the operational stability and service life of pressure relief and sustaining valves: Firstly, when pressure reducing valves are not installed at the upstream end of the pipeline or their functions malfunction, water pressure within the pipeline is prone to fluctuations. Furthermore, the upstream connections of the pressure relief and sustaining valve are numerous, and the water usage times for each branch are not fixed, often resulting in multiple branches using water simultaneously or some branches using water while others are closed. In this situation, when using existing pressure relief and sustaining valves, the pressure in the filter chamber often approaches the valve's pressure-holding set value, causing the valve to frequently switch between pressure-holding and pressure-relieving states, leading to continuous vibration. This vibration gradually loosens the pipe connection bolts around the pressure-holding and pressure-relieving valve, damaging the sealing performance and easily causing water leakage at the sealing points after long-term operation. Further development can lead to the main valve 11 failing to discharge water normally after the valve reaches the set pressure, causing delayed opening and closing actions and reduced pressure control accuracy, thus adversely affecting the safe operation of the upstream pipeline system. This highlights the serious threat that the vibration caused by the frequent switching of valve states poses to the valve's own lifespan and that of surrounding pipelines.

[0043] On the other hand, during the depressurization process, if the water pressure in the pipeline is high, it will cause the valve stem 115 to rise at a relatively fast speed. At this time, the first diaphragm 113 needs to withstand the large pulling force generated by the movement of the valve stem 115. This instantaneous impact force will accelerate the fatigue wear of the first diaphragm 113, shorten its service life, and affect the overall reliable operation of the valve.

[0044] Based on this, in the pressure-adjustable pressure relief valve provided in this embodiment of the invention, each shielding part 3 is configured to have a cavity 301, the cavity 301 being a columnar structure, coinciding with the extending direction of the shielding part 3, and penetrating through the bottom of the shielding part 3, and storing air inside the cavity 301; two retaining rings 302 are integrally formed inside the cavity 301, and the two retaining rings 302 are arranged axially at intervals; a sliding member 4 and a second compression spring 6 are inserted into each cavity 301, the sliding member 4 having a rod 401 and a base 402, the rod 401 being inclinedly disposed on the base 402. At the top, a piston ring 4011 is integrally formed in the middle of the insert rod 401. During installation, the insert rod 401 is inserted into the cavity 301. The piston ring 4011 is located between the two retaining rings 302 and forms a piston-like engagement with the shielding part 3. At this time, the shielding part 3, the insert rod 401, and the two retaining rings 302 together surround and form the piston cavity. The base 402 is located outside the cavity 301 during installation and is fan-shaped with the larger end facing upwards. Its outer side wall is an inwardly concave arc surface, and its inner side wall is an inwardly convex arc surface. When the shielding part 3 is assembled into a complete conical ring structure, as... Figure 11 As shown, adjacent bases 402 abut against each other, forming a complete conical ring structure to reduce the passage of water, and adjacent irregular parts 501 abut against each other; the second compression spring 6 is connected between the end of the insertion rod 401 and the blocking part 3, and is used to drive the insertion rod 401 to reset; each base 402 is threaded with a rotating shaft 5, the rotating shaft 5 and the insertion rod 401 are in the same plane, and the included angle between the rotating shaft 5 and the insertion rod 401 is an obtuse angle; an irregular part 501 is integrally formed at the bottom of each rotating shaft 5. The irregular part 501 is a sheet-like structure and is perpendicular to the rotating shaft 5. The irregular part 501 is elliptical in shape. The top of the valve seat 114 is provided with multiple irregular grooves 1142. The multiple irregular grooves 1142 are interconnected and form an annular groove structure. The annular groove structure is coaxially arranged with the valve port 1141 and has an inverted T-shaped cross-section. The width of the small end of the annular groove structure is equal to the length of the minor axis of the irregular part 501, and the width of the large end of the annular groove structure is equal to the length of the major axis of the irregular part 501.

[0045] Initially, the irregular part 501 is inserted into the annular groove structure composed of multiple irregular grooves 1142, and the long axis of the irregular part 501 extends along the radial direction of the annular structure, so that it forms a snap-fit ​​with the annular groove structure; the rotating shaft 5 and the base 402 are both vertically arranged.

[0046] During the upward movement of valve disc 1152, due to the limitation of the inclined structure, valve disc 1152 synchronously drives the blocking part 3 and sliding part 4 to move upward. Because the irregular part 501 is engaged within the annular structure composed of multiple irregular grooves 1142, the rotating shaft 5 cannot move upward. Under the threaded engagement, the rotating shaft 5 rotates. After the rotating shaft 5 rotates 90 degrees, the long axis of the irregular part 501 is perpendicular to the groove width direction of the annular groove structure, and it disengages from the annular groove structure. As the blocking part 3 continues to move upward, the rotating shaft 5 and the irregular part 501 synchronously follow and move upward. At the same time, the second compression spring 6 is released, causing the sliding part 4, rotating shaft 5, and irregular part 501 to extend outward. Figure 11 As shown, when the insertion rod 401 is horizontal, the adjacent bases 402 abut and form a ring-cone structure, reducing the flow of water. The adjacent irregular parts 501 abut. Then, the water flow pushes the bases 402 and the shielding part 3 to continue to rotate inward. With the stop cooperation between the adjacent irregular parts 501, the rotating shaft 5 drives the insertion rod 401 to insert into the cavity 301, so that the compressed air compresses the second compression spring 6, which can act as a damping structure to consume vibration energy. This reduces the vibration of the valve stem 115, valve disc 1152 and first diaphragm 113, thereby reducing the wear between the components and improving the service life of the pressure-adjustable relief valve.

[0047] like Figure 13 As shown, when the shielding part 3 rotates to the position, the shielding part 3 is spliced ​​into a conical ring structure, and the inner side wall and the second sealing ring conical surface 11521 are in contact. The shielding part 3 rotates a total of 90 degrees and blocks the second sealing ring conical surface 11521, thereby protecting the second sealing ring conical surface 11521.

[0048] During the downward movement of valve disc 1152, after the blocking part 3 resets, as valve disc 1152 moves, when the irregular part 501 and valve seat 114 abut, because the long axis of irregular part 501 is perpendicular to the groove width direction of the annular structure composed of multiple irregular grooves 1142, irregular part 501 cannot move downward, and the position of rotating shaft 5 in the axial direction is fixed at this time; as valve disc 1152 continues to move, valve disc 1152 drives the blocking part 3 and sliding part 4 to move downward, and the insertion rod 401 is inserted. The compressed air enters the cavity 301, compressing the second spring 6. When the valve disc 1152 frequently opens and closes during this stage, the insert rod 401 reciprocates within the cavity 301, continuously compressing the air. The second spring 6 is continuously released and compressed, thus acting as a damping structure to dissipate vibration energy. This reduces the vibration of the valve stem 115, valve disc 1152, and first diaphragm 113, thereby reducing wear between components and improving the service life of the pressure-adjustable relief valve.

[0049] In other embodiments, the piston chamber may also be filled with damping fluid, and damping holes are provided on the end face of the piston ring 4011. The damping holes are used to allow the damping fluid to pass through, thereby converting the energy of vibration into the heat energy of the damping fluid and dissipating it.

[0050] In other embodiments, the irregular groove 1142 and the irregular component 501 can also be set as irregular shapes such as English letters, Arabic numerals, Greek symbols, etc.

[0051] In other embodiments, to improve the ease of resetting the shielding part 3, a torsion spring is connected between the shielding part 3 and the valve disc 1152. Under the action of the torsion spring, the shielding part 3 can elastically rotate around its own hinge point. Thus, when the shielding part 3 rotates inward, the torsion spring stores force; when the shielding part 3 rotates outward, the torsion spring releases force, assisting the rotation of the shielding part 3.

[0052] In other embodiments, a coil spring 7 may be used instead of a torsion spring.

[0053] In other embodiments, the connecting pipe 14 is configured to also include a third water inlet pipe 144, which is connected to the water inlet chamber 1111, and a pressure gauge 8 is connected to the end of the third water inlet pipe 144. In this way, the water pressure in the water inlet chamber 1111 can be determined by the pressure gauge 8, thereby providing data guidance for adjusting the position of the adjusting screw 123.

[0054] In other embodiments, the third water inlet pipe 144 may also be connected to the base 121 and communicate with the base 121.

[0055] In other embodiments, to improve the stability of the gear 204 during rotation, a sliding groove 2041 is provided on the end face of each gear 204. The sliding groove 2041 has an arc-shaped structure, and its center coincides with the axis of the gear 204. Multiple fixing protrusions 11522 are provided on the valve disc 1152, arranged circumferentially. During installation, the fixing protrusions 11522 are slidably inserted into the sliding grooves 2041. Thus, the sliding fit between the fixing protrusions 11522 and the sliding grooves 2041 improves the stability of the gear 204 during rotation. When the number of shielding parts 3 is eight, the number of fixing protrusions 11522 is eight, and they are evenly arranged circumferentially.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A pressure-adjustable pressure relief valve, characterized in that, The pressure-adjustable relief valve includes a pressure-relieving and holding valve body and a transmission assembly. The pressure-relieving and holding valve body includes a valve body with a valve cavity. A valve seat is fixedly inserted into the valve cavity, dividing the valve cavity into an inlet cavity and an outlet cavity. A valve port is provided on the valve seat, connecting the inlet cavity and the outlet cavity. The valve port has a first sealing ring conical surface, with the small end of the first sealing ring conical surface facing the outlet cavity. A valve stem is inserted into the valve cavity, and the valve stem can slide along its own extension direction. A valve disc is provided on the valve stem, and the valve disc is configured to control the opening and closing of the valve port. The valve disc has a second sealing ring conical surface, which can form a sealing fit with the first sealing ring conical surface. Multiple blocking parts are hinged on the valve disc, and the multiple blocking parts are arranged circumferentially. Under the action of the transmission assembly, the blocking parts can rotate around their own hinge point to block the second sealing ring conical surface after the pressure-adjustable relief valve is opened. Each of the aforementioned blocking portions has a cavity, and a sliding member is inserted into each cavity. The sliding member and the blocking portion form a piston-like engagement. A rotating shaft is threaded into each sliding member. The rotating shaft and the sliding member can slide relative to each other along the axial direction. The valve seat has multiple irregularly shaped grooves arranged circumferentially. Each rotating shaft is provided with an irregularly shaped member, the shape of which is the same as the shape of the irregularly shaped groove and can pass through the irregularly shaped groove. Adjacent irregularly shaped members can form a stop engagement. The sliding member is connected to the blocking portion through a second elastic member.

2. The pressure-adjustable pressure relief valve according to claim 1, characterized in that, The transmission assembly includes a sliding ring sleeved on the valve stem and capable of forming a stop with the valve body. The two end faces of the sliding ring are respectively connected to the valve stem through two first elastic elements. Under the action of the first elastic elements, the sliding ring can slide elastically along its own axis. The sliding ring is provided with multiple racks, which extend in a direction parallel to the axis of the sliding ring and are arranged circumferentially. Each of the blocking parts is provided with a gear, the axis of which coincides with the hinge point of the blocking part, and the gear meshes with the rack.

3. The pressure-adjustable pressure relief valve according to claim 2, characterized in that, The first elastic element is a first compression spring.

4. The pressure-adjustable pressure relief valve according to claim 1, characterized in that, The cavity is filled with damping fluid.

5. The pressure-adjustable pressure relief valve according to claim 4, characterized in that, The damping fluid is air.

6. The pressure-adjustable pressure relief valve according to claim 1, characterized in that, The second elastic element is a second compression spring.

7. The pressure-adjustable pressure relief valve according to claim 1, characterized in that, The shielding part is connected to the valve disc via a third elastic element. Under the action of the third elastic element, the shielding part can elastically rotate around its own hinge point.

8. The pressure-adjustable pressure relief valve according to claim 7, characterized in that, The third elastic element is a torsion spring.

9. The pressure-adjustable pressure relief valve according to claim 1, characterized in that, The pressure-adjustable relief valve also includes a pressure gauge configured to detect the water pressure within the valve body.

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