A pressure relief valve with controllable pressure range and its control method

Abstract

The present invention discloses a pressure relief valve with a controllable pressure range and a control method thereof, comprising a valve body, a valve seat, and a linkage assembly, wherein the valve body is provided with a pressure relief channel having an air outlet and an air inlet; the valve seat is arranged in the pressure relief channel for sliding up and down, and the valve seat blocks the air outlet and the air inlet; the linkage assembly comprises two first side plates having a first upper connecting end and a first lower connecting end, and two second side plates having a second upper connecting end and a second lower connecting end, the two first lower connecting ends being hinged to both sides of the valve seat, the two first upper connecting ends and the second lower connecting ends being hinged to each other and both being arranged in an arc shape and sliding on the valve body, and the two second upper connecting ends being arranged in an arc shape and sliding on the valve body; a movable groove is formed between the valve seat, the linkage assembly, and the inner side wall of the pressure relief channel, and liquid metal is arranged in the movable groove. That is, the gas pressure required to push the valve seat gradually changes from a higher pressure to a lower pressure, that is, pressure relief can be performed within the pressure range from a higher pressure to a lower pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a pressure relief valve with a controllable pressure range and a control method thereof. Background Art

[0002] The pressure relief valve is in the closed state in the initial stage and automatically opens and closes according to the working pressure inside the system. It is generally installed on the equipment or pipeline of the closed system. When the internal pressure of the equipment or pipeline exceeds the set pressure of the pressure relief valve, it automatically opens to relieve pressure to ensure personal safety and normal operation of the system.

[0003] Currently, pressure relief valves on the market primarily include spring-loaded and lever-type valves. Spring-loaded pressure relief valves rely on the elastic pressure of a spring to lock seals such as the valve disc or plunger within the valve. Once high pressure within the system overcomes the spring pressure, the locking mechanism opens, creating a pressure relief channel and releasing the high pressure. Lever-loaded pressure relief valves, on the other hand, operate on the principle of leverage. Through the lever and valve stem, the weight's torque acts on the valve disc, sealing the valve seat. When the media pressure exceeds the specified value, the valve disc lifts, releasing pressure to the environment.

[0004] Existing pressure relief valves operate at a fixed pressure during use. When the internal system pressure falls below the spring force or gravity, the valve closes, making it difficult to regulate the system pressure to a safe level. When the internal system is operating, even after the valve closes, relatively high-pressure gas remains inside the pipeline, making it prone to multiple pressure releases in a short period of time, which is detrimental to safe production. Summary of the Invention

[0005] The object of the present invention is to provide a pressure relief valve with a controllable pressure range and a control method thereof, so as to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0006] The technical solutions adopted to solve the above technical problems are:

[0007] , The air vent of described outer combustion gas heating unit is connected with the air vent of described outer combustion gas heating unit, and the air vent of described outer combustion gas heating unit is connected with the air vent of described outer combustion gas heating unit.

[0008] The beneficial effects of the present invention are:

[0009] By placing liquid metal as a gravity source on the valve seat of the pressure relief valve, the high pressure at the air inlet pushes the valve seat upward. When the valve seat moves to its highest position, the valve seat no longer blocks the air outlet and air inlet, and pressure relief begins. At the same time, liquid metal overflows, and the weight of the overflowing liquid metal acts on the second side plate. At this time, the gas pressure required to push the valve seat decreases. When the gas pressure decreases, the valve seat remains at its highest position and no longer blocks the air outlet and air inlet, continuing to relieve pressure. When the air pressure at the air inlet is unable to push the valve seat to overflow the liquid metal, the valve seat moves downward, blocking the air outlet, and no longer relieves pressure. In other words, the gas pressure required to push the valve seat gradually changes from a higher pressure to a lower pressure, which means that pressure relief can be performed within the pressure range from a higher pressure to a lower pressure.

[0010] As a further improvement of the above technical solution, the linkage assembly further comprises two mutually hinged connecting members, and the two ends of the two mutually hinged connecting members are respectively hinged to the two second upper connecting ends. The connecting members improve the stability of the linkage assembly.

[0011] As a further improvement of the above technical solution, a sealed cavity is formed between the connector and the valve seat, the linkage assembly, and the inner wall of the pressure relief channel to prevent liquid metal from flowing out of the movable tank during transportation or installation.

[0012] As a further improvement of the above technical solution, the valve body is provided with a plurality of arc-shaped sliding grooves, and the first upper connecting end and the second upper connecting end are both slidably provided in the arc-shaped sliding grooves, so that the movement of the linkage assembly is more stable.

[0013] As a further improvement to the above technical solution, both the first upper connecting end and the second upper connecting end are provided with a first sliding member slidably arranged in the arc-shaped sliding groove, thereby improving the movement stability of the first upper connecting end and the second upper connecting end.

[0014] As a further improvement to the above technical solution, rubber pads are provided at both ends of the arc-shaped chute to protect the ends of the arc-shaped chute and prevent the first upper connecting end and the second upper connecting end from overshooting due to gravity, which is not conducive to the long-term operation of the equipment.

[0015] As a further improvement of the above technical solution, a sliding groove is provided in the valve body, and the valve seat is provided with a second sliding member slidably arranged in the sliding groove. The sliding groove improves the stability of the movement.

[0016] The present invention further provides a control method for a pressure relief valve with a controllable pressure range, which is applicable to any of the above-mentioned pressure relief valves with a controllable pressure range, and is specifically as follows:

[0017] When the gas pressure at the air inlet reaches the maximum value of the set pressure relief range, the gas pressure at the air inlet pushes the valve seat to move upward, and the linkage assembly moves accordingly with the movement of the valve seat, and the shape of the movable groove changes;

[0018] When the valve seat moves upward, the outlet of the pressure relief valve leaks out to release the high-pressure gas. The weight of part of the liquid metal acts on the second side plate. At this time, the gas pressure required to push the valve seat is reduced.

[0019] As the gas pressure at the air inlet gradually decreases, the gas pressure at the air inlet can still push the valve seat, so that the movable valve seat is located at a position that causes the air outlet of the pressure relief valve to leak;

[0020] When the gas pressure at the air inlet is lower than the minimum value of the set pressure relief range, the valve seat moves downward, and the linkage assembly moves accordingly with the movement of the valve seat. The weight of part of the liquid metal flows back to the valve seat from the second side plate.

[0021] In this control mode, the pressure relief valve can release pressure within a certain pressure range.

[0022] As a further improvement of the above technical solution, when the valve seat moves upward and the air outlet of the pressure relief valve leaks, the liquid metal on the valve seat is called residual liquid metal, and the minimum value of the pressure relief pressure range is determined by adjusting the weight of the residual liquid metal.

[0023] As a further improvement of the above technical solution, the liquid metal on the valve seat when the valve seat starts to move upward is called the initial liquid metal, and the maximum value of the pressure range of the pressure relief is determined by adjusting the weight of the initial liquid metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0025] Figure 1 This is a schematic structural diagram of a pressure relief valve with a controllable pressure range and a control method thereof provided by the present invention, wherein the four arrows represent upward, downward, leftward, and rightward directions respectively;

[0026] Figure 2 This is a schematic diagram of the linkage assembly structure of a pressure relief valve with a controllable pressure range and its control method provided by the present invention, wherein the four arrows represent upward, downward, left and right directions respectively;

[0027] Figure 3 The present invention provides a pressure relief valve with a controllable pressure range and a control method thereof, and a schematic diagram of the linkage assembly structure of an embodiment thereof, wherein the four arrows represent upward, downward, left and right directions respectively. DETAILED DESCRIPTION

[0028] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of the present invention, if there are words such as "several", it means one or more, and "more" means more than two. Greater than, less than, and exceed are understood as not including the number itself, and above, below, and within are understood as including the number itself.

[0031] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0032] Reference Figures 1 to 3 The present invention provides a pressure relief valve with a controllable pressure range and a control method thereof in the following embodiments:

[0033] In one embodiment, referring to Figure 1 As shown, a pressure relief valve with a controllable pressure range includes a valve body 100, a valve seat 200, and a linkage assembly 300. The valve body 100 is used to protect the internal structure and ensure that the movement of the linkage assembly 300 is not affected after the pressure relief valve is opened; the linkage assembly 300 is used to disperse the liquid metal 400 to reduce the weight of the liquid metal 400, achieve lower pressure relief and recover the liquid metal 400; the liquid metal 400 material utilizes its fluidity to control the low pressure relief value.

[0034] Specifically, the valve body 100 is provided with a pressure relief passage 130 having an air outlet 110 and an air inlet 120, wherein the air outlet 110 is located above the air inlet 120; a valve seat 200 is slidably disposed in the pressure relief passage 130, and the valve seat 200 blocks the air outlet 110 and the air inlet 120. When the valve seat 200 slides upward to the uppermost end, the valve seat 200 no longer blocks the air outlet 110 and the air inlet 120, and the pressure relief valve is in a pressure relief state;

[0035] Reference Figure 2 and Figure 3 , Figure 2 and Figure 3 The figure is a simplified schematic diagram illustrating the movement of the linkage assembly 300. The linkage assembly 300 includes two first side plates 310 having a first upper connecting end and a first lower connecting end, and two second side plates 320 having a second upper connecting end and a second lower connecting end. The two first lower connecting ends are hingedly connected to either side of the valve seat 200. The two first upper connecting ends and the second lower connecting ends are hingedly connected to each other and are both slidably mounted on the valve body 100 in an arc shape. The two second upper connecting ends are slidably mounted on the valve body 100 in an arc shape. As the valve seat 200 moves upward, the two first upper connecting ends, the two second lower connecting ends, and the two second upper connecting ends open to the left and right, respectively.

[0036] A movable groove with an upward opening is formed between the valve seat 200, the linkage assembly 300, and the inner wall of the pressure relief passage 130. Liquid metal 400 is contained within this groove. Liquid metal 400 is an amorphous, fluid metal with a higher density than ordinary liquids, high thermal conductivity, and rapid heat dissipation. This protects the pressure relief valve in high-temperature, high-pressure systems. Mercury can be used as the material for liquid metal 400.

[0037] By placing liquid metal 400 as a gravity source on the valve seat 200 of the pressure relief valve, the high pressure at the air inlet 120 pushes the valve seat 200 upward. When the valve seat 200 moves to its highest position, it no longer blocks the air outlet 110 and the air inlet 120, and pressure relief begins. At the same time, the liquid metal 400 overflows, and the weight of the overflowing liquid metal 400 acts on the second side plate 320. At this time, the gas pressure required to push the valve seat 200 decreases. When the gas pressure decreases, the valve seat 200 remains at its highest position and no longer blocks the air outlet 110 and the air inlet 120, continuing to relieve pressure. When the gas pressure at the air inlet 120 is unable to push the valve seat 200 to overflow the liquid metal 400, the valve seat 200 moves downward, blocking the air outlet 110, and no longer relieves pressure. In other words, the gas pressure required to push the valve seat 200 gradually changes from a higher pressure to a lower pressure, meaning that pressure relief can be performed within the pressure range where the higher pressure gradually changes to a lower pressure.

[0038] Furthermore, the linkage assembly 300 also includes two mutually hinged connectors, each of which has its ends hinged to the two second upper connecting ends. The connectors improve the stability of the linkage assembly 300. Specifically, a sealed cavity is formed between the connector and the inner sidewalls of the valve seat 200, the linkage assembly 300, and the pressure relief channel 130. Specifically, the connector is two hinged cover plates 330. The sealed cavity prevents the liquid metal 400 from flowing out of the movable tank during transportation or installation. In other embodiments, the connector may be a connecting rod.

[0039] It should be noted that for the sake of ease of understanding and explanation, the present invention simply divides the sealing cavity into a main cavity and two left and right cavities. In the main cavity, the weight of the liquid metal 400 acts on the valve seat 200; in the left and right cavities, the weight of the liquid metal 400 acts on the two second side plates 320 respectively.

[0040] Furthermore, four arc-shaped chutes are provided in the valve body 100, and the four arc-shaped chutes are divided into two symmetrically distributed first arc-shaped chutes 140 and second arc-shaped chutes 150. The first upper connecting end is slidably provided in the first arc-shaped chutes 140, and the second upper connecting end is slidably provided in the second arc-shaped chutes 150. The movement of the linkage assembly 300 is more stable. Specifically, the first upper connecting end and the second upper connecting end are both provided with a first sliding member that is slidably provided in the arc-shaped chutes, thereby improving the movement stability of the first upper connecting end and the second upper connecting end. The first sliding member can be a pulley, wherein the pulley located at the first upper connecting end is the second pulley 141, and the pulley located at the second upper connecting end is the third pulley 151. The use of pulleys can also improve the operational stability of the pressure relief valve. In some other embodiments, the first sliding member can be a slider.

[0041] As a further improvement, two sliding grooves 160 extending vertically are provided within the valve body 100, and each valve seat 200 is provided with a second sliding member slidably disposed within the sliding grooves 160. The sliding grooves 160 enhance the stability of movement. The second sliding member may be a first pulley 161, or in other embodiments, a slider. It should be noted that the present invention does not impose a limitation on the number of sliding grooves 160, and those skilled in the art may adjust the number based on actual circumstances.

[0042] At this time, the two second pulleys 141 at the top of the main cavity move from the middle to both sides on the two first arc-shaped slide grooves 140; the first side plates 310 of the two sets of pulleys connect the two sets of pulleys (the first pulley 161 and the second pulley 141), fixing the distance between the two sets of pulleys to determine the width of the left and right cavities when the two sets of pulleys move to the final point, thereby knowing the remaining weight of the liquid metal 400 material in the middle cavity.

[0043] As a further improvement, both ends of the arc chute are provided with rubber pads 500. The two ends of the arc chute are protected to prevent the first upper connecting end and the second upper connecting end from overshooting due to gravity or pressure, which is not conducive to the long-term operation of the equipment. Figure 1 , protecting the low position of the sliding groove 160 and the first arc-shaped sliding groove 140 to prevent the first pulley 161 and the second pulley 141 from overshooting due to gravity, which is not conducive to the long-term operation of the equipment.

[0044] Compared to the prior art, this embodiment provides a pressure relief valve with a controllable pressure range. When the thrust generated by the high-pressure gas at the air inlet 120 exceeds the weight of the initial liquid metal 400 material, the valve seat 200 and the two first pulleys 161 are pushed upward until they reach the top of the sliding groove 160, causing the liquid metal 400 material to overflow into the left and right chambers, reducing the weight of the liquid metal 400 and the gravity. In actual operation, by controlling the weight of the initial liquid metal 400 and the volume of the left and right chambers, the system or pipeline can be relieved from a high pressure value to a set low pressure value when reaching a set high pressure relief value. In actual operation, the pressure relief valve achieves pressure relief within a certain pressure range due to the change in the pressure relief value caused by the change in the weight of the liquid metal 400 material inside it. This solves the problem that current pressure relief valves on the market all have fixed pressure relief values, which causes the gas inside the system or pipeline to be at a critical high pressure value for a long time and is easily depressurized multiple times in a short period of time. The present invention relieves pressure from a higher pressure to a lower pressure standard, ensuring production and personal safety.

[0045] The air inlet 120 has a circular cross-section with a radius of 2 cm and a depth of 5 cm. Its end is connected to a gas line from a closed system or pipeline. Obviously, the cross-section, radius, and depth of the pressure relief valve can be selected by those skilled in the art based on actual needs and are not limited to this embodiment.

[0046] In this embodiment, it is preferred that the diameter of the system or pipeline air inlet 120 is smaller, so as to better store pressure and form a greater gas driving force.

[0047] The present invention further provides a control method for a pressure relief valve with a controllable pressure range, which is applicable to any of the above-mentioned pressure relief valves with a controllable pressure range, and is specifically as follows:

[0048] When the gas pressure at the air inlet 120 reaches the maximum value of the set pressure relief range, the gas pressure at the air inlet 120 pushes the valve seat 200 to move upward, and the linkage assembly 300 moves accordingly with the movement of the valve seat 200, and the shape of the movable groove changes;

[0049] When the valve seat 200 moves upward, the gas outlet 110 of the pressure relief valve leaks out, releasing the high-pressure gas. The weight of part of the liquid metal 400 acts on the second side plate 320. At this time, the gas pressure required to push the valve seat 200 decreases.

[0050] As the gas pressure at the air inlet 120 gradually decreases, the gas pressure at the air inlet 120 can still push the valve seat 200, so that the movable valve seat 200 is located at a position that causes the air outlet 110 of the pressure relief valve to leak;

[0051] When the gas pressure at the air inlet 120 is lower than the minimum value of the set pressure relief range, the valve seat 200 moves downward, and the linkage assembly 300 moves accordingly with the movement of the valve seat 200. The weight of part of the liquid metal 400 flows back from the second side plate 320 to the valve seat 200.

[0052] In this control mode, the pressure relief valve can release pressure within a certain pressure range.

[0053] As a further improvement, when the valve seat 200 moves upward and the gas outlet 110 of the pressure relief valve leaks out, the liquid metal 400 on the valve seat 200 is called residual liquid metal, and the minimum value of the pressure relief pressure range is determined by adjusting the weight of the residual liquid metal.

[0054] As a further improvement, the liquid metal 400 on the valve seat 200 when the valve seat 200 starts to move upward is called the initial liquid metal 400 , and the maximum value of the pressure range of the pressure relief is determined by adjusting the weight of the initial liquid metal 400 .

[0055] The patent of this invention provides a pressure relief valve with a controllable pressure range, and its working principle is as follows.

[0056] 1. The nitrogen pipeline is tested for pressure relief valves. The testing process includes the following steps:

[0057] (1) The pressure relief valve contains 6.4 kg of liquid metal 400 material mercury.

[0058] (2) The pressure relief valve of the present invention is connected to the nitrogen pipeline. When the ambient temperature is high, the pressure in the nitrogen pipeline increases, and the pressure gauge in the pipeline shows that the pressure is 50kPa.

[0059] (3) At this time, the pressure relief valve starts to work. Under the push of high-pressure gas, the valve seat 200 and the first pulley 161 fixed on the valve seat 200 are pushed upward. At this time, under the action of the first side plate 310, the second pulley 141 is pushed to move to both sides along the first arc-shaped slide groove 140. The two hinged cover plates 330 are slowly extended. At this time, the left and right end cavities are slowly opened.

[0060] (4) The height of the liquid metal 400 material added to the pressure relief valve is 15 cm, the distance between the first pulley 161 and the second pulley 141 is 16 cm, and the length of the valve seat 200 is 32 cm. During the upward movement of the first pulley 161, the liquid metal 400 is driven to move upward. When the liquid metal 400 reaches the highest point of the pressure relief valve cavity, as the valve seat 200 further rises, the liquid metal 400 material will overflow to both sides into the left and right cavities constructed by the second pulley 141.

[0061] (5) At this time, since the first pulley 161 fixed to the valve seat 200 has not reached the top of the sliding groove 160, the valve seat 200 and the first pulley 161 are still pushed upward by the strong gas pressure until they reach the top of the sliding groove 160.

[0062] (6) When the valve seat 200 and the two first pulleys 161 reach the top of the sliding groove 160, the gas outlet 110 of the pressure relief valve is exposed, allowing the high-pressure gas to escape. At the same time, the left, main and right cavities are all rich in liquid metal 400 material mercury, and their liquid levels are consistent.

[0063] (7) At this time, the height of the liquid level is 7.5 cm. The two second side plates 320 with a length of 10 cm are used to seal the liquid metal 400. The top ends of the two second side plates 320 are stretched by the two hinged cover plates 330 under the action of the pulley 11. After stretching, the horizontal length is 64 cm.

[0064] (8) After the liquid metal 400 is dispersed in different cavities, the remaining weight is 3.2 kg. When the pressure in the nitrogen pipeline is less than 25 kPa, the gravity of the liquid metal 400 material is greater than the thrust caused by the gas pressure in the pipeline. At this time, the valve seat 200 and the first pulley 161 slowly fall. When the valve seat 200 blocks the air outlet channel, the pressure relief valve is closed. The pressure relief range of the pressure relief valve is 25 kPa to 50 kPa.

[0065] (9) Under the action of the gravity of the liquid metal 400 material, the valve seat 200 and the first pulley 161 are slowly descending. At the same time, under the action of the first side plate 310, the second pulley 141 is slowly moving from the left and right ends of the first arc-shaped slide 140 to the middle, and the space of the left and right cavities gradually becomes smaller. The two hinged cover plates 330 are slowly retracted to the middle to form a "V" shape, and the liquid metal 400 material flows back into the main cavity. As the liquid metal 400 material flows back, the valve seat 200 is subjected to greater and greater pressure from the gravity of the liquid metal 400 material, so the speed of its descent is also getting faster and faster.

[0066] (10) Finally, when the first pulley 161 reaches the bottom of the sliding groove 160 and the second pulley 141 is at the top of the main cavity, the liquid metal 400 material is completely recovered and restored to its initial weight of 6.4 kg.

[0067] (11) When the pressure in the subsequent nitrogen pipeline increases further, the pressure relief valve will automatically open and the above steps 3-10 will be repeated.

[0068] 2. Testing of a pressure relief valve in an ultra-high pressure closed system includes the following steps:

[0069] (1) This pressure relief valve contains 8.32 kg of liquid metal 400 material mercury.

[0070] (2) The pressure relief valve of the present invention is connected to the sealing part of the closed system. Due to the mixing of different solvents in the closed system, high-pressure gas is easily generated. If the closed system is not depressurized in time, the cavity will burst due to the action of high pressure. At this time, the pressure gauge at the interface of the closed system sealing part shows that its pressure is 90kPa.

[0071] (3) The pressure relief valve starts to work. Due to the presence of ultra-high pressure gas, the high pressure gas acts on the valve seat 200 at the air inlet 120, pushing the valve seat 200 upward.

[0072] (4) Since the valve seat 200 also has the first pulley 161 fixed at the left and right ends, the first pulley 161 moves upward accordingly. At this time, the second pulley 141 is slowly pushed to move to both sides along the first arc-shaped groove 140 under the action of the first side plate 310 between the two sets of pulleys. At the same time, the two hinged cover plates 330 are slowly extended to both sides, and the space cavities at the left and right ends are also slowly opened.

[0073] (5) The height of the liquid metal 400 material added to the pressure relief valve is 26 cm, the distance between the first pulley 161 and the second pulley 141 is 34 cm, and the length of the valve seat 200 is 32 cm. During the upward movement of the first pulley 161, the liquid metal 400 is driven to move upward. When the liquid metal 400 level rises by 8 cm and reaches the highest point of the main cavity of the pressure relief valve, as the valve seat 200 further rises, the liquid metal 400 material will overflow into the left and right cavities constructed by the second pulley 141.

[0074] (6) During this process, the first pulley 161 fixed to the valve seat 200 has not reached the top of the sliding groove 160, and the high-pressure gas in the closed system has not been released. The valve seat 200 is still pushed by the high-pressure gas and drives the first pulley 161 to move upward until it reaches the top of the sliding groove 160.

[0075] (7) When the valve seat 200 and the first pulley 161 reach the top of the sliding groove 160, the gas outlet 110 of the pressure relief valve is exposed, and the high-pressure gas is released. At this time, the left, main and right cavities are all rich in liquid metal 400 material mercury, and the liquid levels in the three cavities are consistent.

[0076] (8) At this time, the height of the liquid level is 8.34 cm. The liquid metal 400 material is sealed by two support rods with a length of 10 cm vertically fixed to the second pulley 141, and two cover plates 330 with a horizontal length of 100 cm after stretching and hinged to each other.

[0077] (9) After the liquid metal 400 is dispersed in different cavities, the final remaining weight of the liquid metal 400 material in the main cavity is 2.67 kg. When the pressure at the seal of the closed system is less than 28.8 kPa, the gravity of the liquid metal 400 material is greater than the driving force caused by the air pressure. At this time, the valve seat 200 and the two first pulleys 161 slowly fall along the sliding groove 160. When the valve seat 200 blocks the air outlet 110, the pressure relief valve is closed. The pressure relief range of the pressure relief valve is 28.8 kPa to 90 kPa.

[0078] (10) Under the action of the gravity of the liquid metal 400 material, the valve seat 200 and the first pulley 161 are slowly descending. At the same time, under the action of the first side plate 310 between the two groups of pulleys, the two second pulleys 141 are respectively moved slowly toward the middle at the left and right ends of the first arc-shaped slide 140. At the same time, the space of the left and right end cavities gradually becomes smaller, and the two hinged cover plates 3304 are slowly retracted inward to form a "V" shape, and the liquid metal 400 material slowly flows back into the main cavity; and as the liquid metal 400 material flows back, the pressure on the valve seat 200 caused by the gravity of the liquid metal 400 material becomes greater and greater, so the speed at which the valve seat 200 and the first pulley 161 slide down becomes faster and faster.

[0079] (11) When the first pulley 161 reaches the lowest point of the sliding groove 160, the second pulley 141 reaches the top of the main cavity along the inclined first arc-shaped sliding groove 140, and the liquid metal 400 material is completely recovered and restored to its initial weight of 8.34 kg.

[0080] (12) In the subsequent pressure relief valve test, when the pressure in the closed system reaches 90kPa, the pressure relief valve will open and repeat the above steps 3-11 to discharge the high-pressure gas in the closed system until the gas pressure in the closed system is only 28.8kPa. At this time, the pressure relief valve is closed, the liquid metal 400 is recovered, and the inside of the pressure relief valve returns to its initial state; the continuous cycle can ensure the normal operation of the equipment in the closed system and personal safety.

[0081] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A pressure relief valve with a controllable pressure range, characterized in that: include: A valve body (100) is provided with a pressure relief channel (130) having an air outlet (110) and an air inlet (120), wherein the air outlet (110) is located above the air inlet (120); a valve seat (200) slidably disposed in the pressure relief channel (130), the valve seat (200) blocking the air outlet (110) and the air inlet (120); A linkage assembly (300) comprising two first side plates (310) having a first upper connecting end and a first lower connecting end, and two second side plates (320) having a second upper connecting end and a second lower connecting end, wherein the two first lower connecting ends are hinged to both sides of the valve seat (200), the two first upper connecting ends and the second lower connecting ends are hinged to each other and are both arranged in an arc-shaped sliding manner on the valve body (100), and the two second upper connecting ends are arranged in an arc-shaped sliding manner on the valve body (100); A movable groove is formed between the valve seat (200), the linkage assembly (300), and the inner side wall of the pressure relief channel (130), and liquid metal (400) is provided in the movable groove.

2. A pressure relief valve with controllable pressure range according to claim 1, characterized in that: The linkage assembly (300) further comprises two mutually hinged connecting members, and both ends of the two mutually hinged connecting members are respectively hinged to the two second upper connecting ends.

3. The pressure relief valve with controllable pressure range according to claim 2, characterized in that: A sealed cavity is formed between the connecting piece and the inner side wall of the valve seat (200), the linkage assembly (300), and the pressure relief channel (130).

4. The pressure relief valve with controllable pressure range according to claim 1, characterized in that: A plurality of arc-shaped sliding grooves are provided in the valve body (100), and the first upper connecting end and the second upper connecting end are both slidably provided in the arc-shaped sliding grooves.

5. The pressure relief valve with controllable pressure range according to claim 4, characterized in that: The first upper connecting end and the second upper connecting end are both provided with a first sliding member slidably arranged in an arc-shaped sliding groove.

6. The pressure relief valve with controllable pressure range according to claim 4, characterized in that: Rubber pads (500) are provided at both ends of the arc-shaped slide groove.

7. The pressure relief valve with controllable pressure range according to claim 1, characterized in that: A sliding groove (160) is provided in the valve body (100), and the valve seat (200) is provided with a second sliding member slidably arranged in the sliding groove (160).

8. A control method for a pressure relief valve with a controllable pressure range, characterized in that: The pressure relief valve with a controllable pressure range as claimed in any one of claims 1 to 7 is as follows: When the gas pressure at the air inlet (120) reaches the maximum value of the set pressure relief range, the gas pressure at the air inlet (120) pushes the valve seat (200) to move upward, and the linkage assembly (300) moves accordingly with the movement of the valve seat (200), and the shape of the movable groove changes; When the valve seat (200) moves upward, causing the gas outlet (110) of the pressure relief valve to leak out, releasing the high-pressure gas, the weight of part of the liquid metal (400) acts on the second side plate (320), and at this time, the gas pressure required to push the valve seat (200) decreases; As the gas pressure at the air inlet (120) gradually decreases, the gas pressure at the air inlet (120) can still push the valve seat (200), so that the movable valve seat (200) is located at a position that causes the air outlet (110) of the pressure relief valve to leak; When the gas pressure at the air inlet (120) is less than the minimum value of the set pressure relief range, the valve seat (200) moves downward, the linkage assembly (300) moves accordingly with the movement of the valve seat (200), and the weight of part of the liquid metal (400) flows back to the valve seat (200) from the second side plate (320).

9. The control method of a pressure relief valve with a controllable pressure range according to claim 8, characterized in that: When the valve seat (200) moves upward to cause the air outlet (110) of the pressure relief valve to leak out, the liquid metal (400) on the valve seat (200) is called the residual liquid metal. The minimum value of the pressure relief pressure range is determined by adjusting the weight of the residual liquid metal.

10. The control method of a pressure relief valve with a controllable pressure range according to claim 8, characterized in that: The maximum value of the pressure range for pressure relief is determined by adjusting the total weight of the liquid metal (400).

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