Pressure release valve control device

Abstract

The utility model relates to a pressure release valve control device which comprises a pressure release valve, a control valve unit, a nitrogen storage control assembly, a temperature difference stabilizing assembly, a first pipeline and a second pipeline, the pressure release valve is provided with an inner cavity gas chamber, and the control valve unit is communicated with the inner cavity gas chamber. The nitrogen storage control assembly communicates with the control valve unit through the first pipeline, the temperature difference stabilizing assembly communicates with the control valve unit through a second pipeline, and the temperature difference stabilizing assembly comprises a main tank body communicating with the second pipeline and a variable gas cavity unit arranged in the main tank body; the variable air cavity unit can stretch out and draw back in the axial direction of the main tank body. The pressure release valve control device designed by the utility model can quickly and effectively respond to the change of temperature and pressure to adjust the pressure, so that the pressure release valve is kept in a constant-pressure state.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve control technical field, especially, relate to a kind of pressure relief valve control device. BACKGROUND

[0002] Water hammer relief valve is a kind of protection device for preventing overpressure of pipeline or equipment due to water hammer. Water hammer phenomenon usually occurs in fluid conveying system, when fluid suddenly stops flowing or changes flow direction, due to inertia and elastic effect, it can cause transient pressure rise or drop. This pressure fluctuation can cause serious damage to pipeline, valve and other equipment. Therefore, water hammer relief valve is widely used in many industrial applications to ensure the safe operation of system. Nitrogen water hammer relief valve as a kind of it force water hammer relief valve, with strong flow capacity, rapid response to water hammer pressure peak, stable closing, no secondary water hammer characteristics, has been widely used in crude oil, asphalt, heavy lubricating oil and other high viscosity medium transportation pipeline. However, the current nitrogen water hammer relief valve has certain defects in constant temperature and pressure control, and cannot quickly and effectively respond to temperature and pressure changes. SUMMARY

[0003] In view of the above problems, the utility model aims at designing a kind of pressure relief valve control device, can quickly and effectively respond to temperature and pressure changes, carry out pressure regulation, make pressure relief valve keep constant pressure state.

[0004] The utility model discloses the purpose that is realized through the following technical schemes:

[0005] Design a kind of pressure relief valve control device, including pressure relief valve and control valve unit, the pressure relief valve is equipped with inner cavity air chamber, the control valve unit is connected with the inner cavity air chamber, further including nitrogen storage control assembly, temperature difference flattening component, first pipe line and second pipe line, the nitrogen storage control assembly is connected with the control valve unit by the first pipe line, the temperature difference flattening component is connected with the control valve unit by second pipe line, the temperature difference flattening component includes the main tank body being connected with the second pipe line, variable air cavity unit being arranged in the main tank body, the variable air cavity unit can be telescopic along the axial direction of the main tank body.

[0006] In this design, a nitrogen-type water hammer pressure relief valve is used. The valve has an axial flow structure, with its inlet connected to the upstream pipeline and its outlet connected to the discharge pipeline. The valve's internal chamber is connected to both the first and second pipelines via a control valve unit. Under normal operating conditions, the nitrogen storage control component fills the valve's internal chamber with nitrogen through the first pipeline, raising the pressure to the set pressure. The valve disc, under pressure, abuts against the seal at the inlet, keeping the valve closed. When water hammer occurs in the pipeline, the upstream pipeline pressure exceeds the valve's set pressure, causing the valve disc to open. A portion of the medium in the upstream pipeline is then discharged into the pressure relief container through the discharge pipeline, thus reducing the water hammer pressure and protecting the pipeline and equipment. With the opening of the pressure relief valve, the energy of the water hammer wave is released. When the pipeline pressure drops below the set pressure value of the pressure relief valve, under the action of system pressure, the valve disc of the pressure relief valve re-engages with the sealing element, completing the valve closure process and restoring normal operation. The inner chamber of the pressure relief valve is connected to the temperature difference mitigation component through a second pipeline, so the pressure in the inner chamber is the same as that in the main tank. The variable chamber unit is also filled with nitrogen, and its internal pressure is lower than that in the main tank. When the valve disc of the pressure relief valve moves, causing a change in the volume of the inner chamber, the expansion and contraction of the variable chamber unit increases or decreases the internal volume of the main tank to maintain system pressure balance. Therefore, the inner chamber of the pressure relief valve can always maintain a constant pressure. In addition, during normal operation of the pressure relief valve, the temperature difference mitigation component can reduce system pressure fluctuations caused by temperature changes. Specifically, when the temperature change in the main tank is small, but the temperature change in the inner chamber of the pressure relief valve is large, the pressure in the inner chamber fluctuates. The internal chamber temperature is balanced by the heat exchange between the inner chamber and the nitrogen in the main tank, thus stabilizing the pressure in the inner chamber. When the temperature inside the main tank and the temperature of the internal chamber of the pressure relief valve change significantly, and the temperature cannot be balanced through heat exchange, the pressure in the internal chamber fluctuates. However, by expanding and contracting the variable chamber unit, the system pressure can be kept balanced, and the internal chamber of the pressure relief valve can always maintain a constant pressure. Through this design, this device can quickly and effectively respond to pressure fluctuations caused by changes in the volume and temperature of the internal chamber of the pressure relief valve, effectively regulating the system pressure and ensuring that the pressure relief valve always maintains a constant pressure.

[0007] Furthermore, the variable air chamber unit includes a variable air chamber and fixed plates disposed at both ends of the variable air chamber, wherein one of the fixed plates is fixed to the inner side of the bottom of the main tank.

[0008] The variable air chamber can be made of an elastic corrugated tubular air bladder. The two ends of the air bladder can be designed to be the same size or different sizes. It is fixed to the main tank by a fixing plate. The axial expansion and contraction of the variable air chamber changes the internal volume of the main tank and absorbs pressure fluctuations.

[0009] Further, the variable air chamber is provided with a plurality of guide units on the circumferential side, each of which comprises a guide cylinder and a guide column fixed on two fixed plates respectively, and the end of the guide column close to the guide cylinder extends into the guide cylinder.

[0010] The guide units play a guiding role when the variable air chamber extends or retracts along the axial direction, and limit the variable air chamber to extend or retract only along the axial direction, preventing the radial deviation of the variable air chamber from causing sealing failure.

[0011] Further, the side wall of the guide cylinder is provided with a limiting groove, and the end of the guide column is provided with a limiting block embedded in the limiting groove.

[0012] The side wall of the guide cylinder is provided with a limiting groove, which can be a through groove or a groove, and the limiting groove extends along the axial direction. Through this limiting structure, the overstretching or compression of the variable air chamber is prevented.

[0013] Further, the circumferential side of the variable air chamber is also provided with a plurality of elastic members, and the two ends of each elastic member are connected to the two fixed plates respectively.

[0014] The elastic member can be a spring. When the variable air chamber extends or retracts, the spring extends or retracts synchronously to generate elastic force, which applies force to the fixed plate, assisting the variable air chamber to return to the initial state after extension or retraction and avoiding permanent deformation.

[0015] Further, the elastic member corresponds to the guide cylinder one by one, and is sleeved on the guide cylinder.

[0016] The elastic member is a spring and is sleeved on the guide cylinder. When the spring is compressed, the guide cylinder can guide the deformation of the spring to avoid bending and failure when the spring is compressed.

[0017] Further, the variable air chamber unit further comprises a third pipeline, one end of which communicates with the variable air chamber, and the other end of which extends out of the main tank body.

[0018] The third pipeline communicates with the variable air chamber. Through the third pipeline, nitrogen can be injected into the variable air chamber to reach a preset pressure. In addition, according to the change of the external temperature, the size of the pressure in the variable air chamber can be dynamically adjusted through the third pipeline to meet the system pressure demand.

[0019] Further, the outer wall of the main tank body is covered with a thermal insulation layer.

[0020] By arranging the thermal insulation layer on the outer wall of the main tank body, the temperature in the main tank body can be kept as stable as possible within a certain range to play a constant temperature role. The thermal insulation layer can be filled with phase change materials such as paraffin-based composite materials to offset the influence of temperature sudden change on the pressure of nitrogen. The thermal insulation layer can also be wrapped with rock wool, polyurethane foam and other materials to reduce the conduction rate of external temperature.

[0021] Further, the nitrogen storage control assembly comprises a plurality of nitrogen storage units, and the outlets of the nitrogen storage units are provided with electromagnetic controls and pressure sensors.

[0022] The nitrogen storage units can be composed of a plurality of nitrogen cylinders connected in series, and the plurality of nitrogen storage units are connected in parallel in the first pipeline. The device further comprises a control system, when the pressure in the cavity chamber of the pressure relief valve is reduced, the control system can automatically control the nitrogen storage control assembly to automatically supplement nitrogen to maintain the constant pressure. In addition, the input end of the system is in communication connection with the pressure sensor, and the output end of the control system is in communication connection with the electromagnetic control, when the pressure in the nitrogen storage unit is lower than the set value, the pressure sensor feeds back the pressure signal to the control system, and the control system sends the control signal to make the electromagnetic control act, and the nitrogen storage unit is automatically switched as the nitrogen source.

[0023] Further, the control valve unit comprises a relief valve.

[0024] Under the control of the control system, the relief valve has an automatic exhaust function, when the pressure in the cavity chamber of the pressure relief valve is increased, and the temperature difference stabilizing assembly cannot effectively adjust the pressure, a part of nitrogen is released through the automatic exhaust function of the relief valve, so that the pressure in the cavity chamber of the pressure relief valve is reduced, and the stability of the pressure can be effectively ensured.

[0025] Compared with the prior art, the device has the following beneficial effects:

[0026] In the scheme, the pressure relief valve adopts nitrogen water hammer pressure relief valve, the pressure relief valve is the axial flow structure, the inlet of the pressure relief valve is communicated with the upstream pipeline, the outlet of the pressure relief valve is communicated with the discharge pipeline, the inner chamber air chamber of the pressure relief valve is communicated with the first pipeline and the second pipeline through the control valve unit.In the normal working state, the nitrogen storage control assembly fills the inner chamber air chamber of the pressure relief valve with nitrogen through the first pipeline, so that the pressure of the inner chamber air chamber reaches the set pressure, the valve disc of the pressure relief valve is abutted with the sealing element at the inlet of the pressure relief valve under the action of the pressure, so that the pressure relief valve remains closed.When water hammer occurs in the pipeline, the pressure of the upstream pipeline exceeds the valve set pressure, the valve disc of the pressure relief valve is opened, part of the medium in the upstream pipeline is discharged into the pressure relief container through the discharge pipeline, so as to reduce the water hammer pressure and protect the pipeline and equipment.The energy of the water hammer wave is released when the pressure relief valve is opened.When the pipeline pressure is below the set pressure value of the pressure relief valve, the valve disc of the pressure relief valve is abutted with the sealing element again under the action of the system pressure, the closing process of the valve is realized, and the normal working state is restored.The inner chamber air chamber of the pressure relief valve is communicated with the temperature difference suppression assembly through the second pipeline, so the inner chamber air chamber and the air pressure in the main tank body are the same, the variable air chamber unit is also filled with nitrogen, and the air pressure in the variable air chamber unit is lower than the air pressure in the main tank body.When the valve disc of the pressure relief valve moves to change the volume of the inner chamber air chamber, the variable air chamber unit is stretched or reduced to increase or reduce the volume of the main tank body, so that the system pressure is balanced, and the inner chamber air chamber of the pressure relief valve can always maintain a constant pressure.In addition, when the pressure relief valve is in the normal working state, the temperature difference suppression assembly can reduce the system pressure fluctuation caused by temperature change, specifically, when the temperature change in the main tank body is small and the temperature change in the inner chamber air chamber of the pressure relief valve is large, the pressure of the inner chamber air chamber fluctuates, the temperature of the inner chamber air chamber is balanced through the heat exchange between the nitrogen in the inner chamber air chamber and the main tank body, so that the pressure of the inner chamber air chamber can be kept stable.When the temperature in the main tank body and the temperature in the inner chamber air chamber of the pressure relief valve change greatly at the same time, the temperature cannot be balanced through heat exchange, the pressure of the inner chamber air chamber fluctuates, and the variable air chamber unit is stretched or reduced to keep the system pressure balanced, so that the inner chamber air chamber of the pressure relief valve can always maintain a constant pressure.Through the above design, the device can quickly and effectively respond to the pressure fluctuation caused by the volume and temperature change of the inner chamber air chamber of the pressure relief valve, effectively regulate the system pressure, and make the pressure relief valve always maintain a constant pressure. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a structural schematic view of the pressure relief valve control device of the utility model one embodiment.

[0028] Figure 2 It is a sectional view of the pressure relief valve of the utility model one embodiment.

[0029] Figure 3 It is a perspective view of the temperature difference suppression assembly of the utility model one embodiment.

[0030] Figure 4 The sectional view of the temperature difference flattening assembly of one embodiment of the utility model.

[0031] Figure 5 For Figure 3 The local enlarged view of A.

[0032] Illustration: 1, pressure relief valve; 11, inner cavity air chamber; 12, valve flap; 2, control valve unit; 21, discharge valve; 3, nitrogen storage control assembly; 31, nitrogen storage unit; 32, electromagnetic control; 33, pressure sensor; 4, temperature difference flattening assembly; 41, main tank body; 42, variable air cavity unit; 43, heat preservation layer; 421, variable air cavity; 422, fixed plate; 423, guide unit; 424, elastic piece; 425, third pipeline; 4231, guide cylinder; 4232, guide column; 4233, limiting groove; 4234, limiting block; 5, first pipeline; 6, second pipeline. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The preferred embodiments of the utility model are shown in the drawings. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein.

[0034] As Figures 1 to 5 Indicated, the embodiment provides a pressure relief valve control device, including pressure relief valve 1, and with the inner cavity air chamber 11 of pressure relief valve 1 communication control valve unit 2, pressure relief valve 1 is the axial flow type structure, pressure relief valve 1 adopts nitrogen formula water hammer pressure relief valve, pressure relief valve adopts prior art, and its internal specific structure refers to Figure 2 , not too much here. The inlet of pressure relief valve 1 is communicated with the upstream pipeline, and the outlet of pressure relief valve 1 is communicated with the discharge pipeline, and the device further includes nitrogen storage control assembly 3, temperature difference flattening assembly 4, first pipeline 5 and second pipeline 6, the inner cavity air chamber 11 of pressure relief valve 1 is communicated with first pipeline 5 and second pipeline 6 through control valve unit 2, nitrogen storage control assembly 3 is communicated with control valve unit 2 through first pipeline 5, temperature difference flattening assembly 4 is communicated with control valve unit 2 through second pipeline 6, and temperature difference flattening assembly 4 includes main tank body 41 communicated with second pipeline 6, variable air cavity unit 42 arranged in the inside of main tank body 41, and variable air cavity unit 42 can be telescopic along the axial direction of main tank body 41.

[0035] In the normal working state, the nitrogen storage control assembly 3 fills the inner cavity chamber 11 of the pressure relief valve 1 with nitrogen through the first pipeline 5, so that the pressure of the inner cavity chamber 11 reaches the set pressure, and the valve disc 12 of the pressure relief valve 1 is abutted against the sealing element at the inlet of the pressure relief valve 1 under the action of the pressure, so that the pressure relief valve 1 remains in the closed state. When water hammer occurs in the pipeline, the pressure of the upstream pipeline exceeds the set pressure of the valve, the valve disc 12 of the pressure relief valve 1 is pushed open, and part of the medium in the upstream pipeline is discharged into the pressure relief container through the discharge pipeline, thereby reducing the water hammer pressure and protecting the pipeline and equipment. With the opening of the pressure relief valve 1, the energy of the water hammer wave is released. When the pressure of the pipeline decreases to below the set pressure of the pressure relief valve, the valve disc 12 of the pressure relief valve 1 is abutted against the sealing element again under the action of the system pressure, the closing process of the valve is realized, and the normal working state is restored. The inner cavity chamber 11 of the pressure relief valve 1 is connected with the temperature difference suppression assembly 4 through the second pipeline 6, so that the inner cavity chamber 11 has the same pressure as the pressure in the main tank body 41, and the variable air chamber unit 42 is also filled with nitrogen, and the internal pressure is lower than the pressure in the main tank body 41. When the valve disc 12 of the pressure relief valve 1 moves to change the volume of the inner cavity chamber 11, the variable air chamber unit 42 is stretched or contracted to increase or decrease the volume of the main tank body 41, so as to keep the system pressure balanced, and the inner cavity chamber 11 of the pressure relief valve 1 can always keep constant pressure. In addition, when the pressure relief valve 1 is in the normal working state, the temperature difference suppression assembly 4 can reduce the system pressure fluctuation caused by temperature change. Specifically, when the temperature change in the main tank body 41 is small and the temperature change in the inner cavity chamber 11 of the pressure relief valve 1 is large, the pressure of the inner cavity chamber 11 fluctuates, the temperature of the inner cavity chamber 11 is balanced through the heat exchange between the nitrogen in the inner cavity chamber 11 and the main tank body 41, and the pressure of the inner cavity chamber 11 can be kept stable. When the temperature in the main tank body 41 and the temperature in the inner cavity chamber 11 of the pressure relief valve 1 change synchronously and greatly, the temperature cannot be balanced through heat exchange, the pressure of the inner cavity chamber 11 fluctuates, and the variable air chamber unit 42 is stretched or contracted to keep the system pressure balanced, and the inner cavity chamber 11 of the pressure relief valve 1 can always keep constant pressure. Through the above design, the device can quickly and effectively respond to the pressure fluctuation caused by the volume and temperature change of the inner cavity chamber 11 of the pressure relief valve 1, effectively regulate the system pressure, and keep the pressure relief valve 1 in constant pressure state.

[0036] As Figures 3 to 5As shown, the variable air chamber unit 42 comprises a variable air chamber 421 and fixing plates 422 arranged at both ends of the variable air chamber 421, one of which is fixed to the inner wall of the bottom of the main tank body 41. The variable air chamber 421 can adopt an elastic bellows-shaped air bag, the sizes of both ends of which can be designed to be consistent or different, and the both ends are sealingly connected with the fixing plates 422, which are fixed in the main tank body 41 through the fixing plates 422, and the cavity volume of the main tank body 41 is changed through the expansion and contraction of the variable air chamber 421 to absorb pressure fluctuation. A plurality of guide units 423 are arranged on the circumferential side of the variable air chamber 421, and the guide units 423 are arranged at least two. The guide units 423 play a guiding role when the variable air chamber 421 expands and contracts along the axial direction, and limit the variable air chamber 421 to expand and contract only along the axial direction to prevent the variable air chamber 421 from deviating radially to cause sealing failure. The guide units 423 comprise guide cylinders 4231 and guide columns 4232 fixed on the two fixing plates 422 respectively, and the end of the guide column 4232 close to the guide cylinder 4231 extends into the guide cylinder 4231. The side wall of the guide cylinder 4231 is provided with a limiting groove 4233, which can be a through groove or a groove, and the limiting groove 4233 extends along the axial direction. The end of the guide column 4232 is provided with a limiting block embedded in the limiting groove 4233, and through this limiting structure, the variable air chamber 421 is prevented from being excessively stretched or compressed. In addition, a plurality of elastic members 424 are arranged on the circumferential side of the variable air chamber 421, the elastic members 424 correspond to the guide cylinders 4231 one by one and are sleeved on the guide cylinders 4231, and the two ends of the elastic members 424 are connected to the two fixing plates 422 respectively. The elastic members 424 can adopt springs, which expand and contract synchronously to generate elastic force when the variable air chamber 421 expands and contracts, apply force to the fixing plates 422, assist the variable air chamber 421 to restore the initial state after expansion and contraction, and avoid permanent deformation. When the spring is compressed, the guide cylinder 4231 can guide the deformation of the spring to avoid bending and failure when the spring is compressed.

[0037] As shown in Figure 3 and Figure 4 The variable air chamber unit 42 further comprises a third pipeline 425, one end of which communicates with the variable air chamber 421 and the other end of which extends out of the main tank body 41. The third pipeline 425 is in a hose structure in the main tank body 41, which can deform in coordination with the expansion and contraction of the variable air chamber 421. Nitrogen can be injected into the variable air chamber 421 through the third pipeline 425 to reach a preset pressure. In addition, according to the change of the external temperature, the size of the pressure in the variable air chamber 421 can be dynamically adjusted through the third pipeline 425 to meet the system pressure demand.

[0038] As shown in Figure 3 and Figure 4As shown, the main tank body 41 drives the outer wall to cover the heat preservation layer 43. By arranging the heat preservation layer 43 on the outer wall of the main tank body 41, the temperature in the main tank body 41 is kept stable in a certain range as much as possible to play a constant temperature role by being isolated from the external environment. The heat preservation layer 43 can be filled with a phase change material such as a paraffin-based composite material, and the influence of temperature mutation on the nitrogen pressure is offset by using the heat absorption or release characteristics thereof. The heat preservation layer 43 can also be wrapped with rock wool, polyurethane foam and other materials to reduce the temperature conduction rate of the external environment.

[0039] As shown in the figure, Figure 1 The nitrogen storage control assembly 3 includes a plurality of nitrogen storage units 31, and the outlet of the nitrogen storage unit 31 is provided with an electromagnetic control member 32 and a pressure sensor 33. The electromagnetic control member 32 controls the communication of the nitrogen storage unit 31 with the first pipeline 5, and the pressure sensor 33 detects the pressure of the nitrogen storage unit 31. The nitrogen storage unit 31 can be composed of a plurality of nitrogen cylinders connected in series, and a plurality of nitrogen storage units 31 are connected in parallel to the first pipeline 5. The device also includes a control system, which can use an existing control system, and will not be described in detail here. When the pressure in the inner cavity chamber 11 of the pressure relief valve 1 is reduced, the control system can automatically control the nitrogen storage control assembly 3 to automatically supplement nitrogen to maintain the constant pressure. In addition, the input end of the control system is in communication connection with the pressure sensor 33, and the output end of the control system is in communication connection with the electromagnetic control member 32. When the pressure in the nitrogen storage unit 31 is lower than the set value, the pressure sensor 33 feeds back the pressure signal to the control system, and the control system sends a control signal to make the electromagnetic control member 32 act, and automatically switches the nitrogen storage unit 31 as the nitrogen source.

[0040] As shown in the figure, Figure 1 The control valve unit 2 includes a relief valve 21. Under the control of the control system, the relief valve 21 has an automatic exhaust function. When the pressure in the inner cavity chamber 11 of the pressure relief valve 1 increases and the temperature difference stabilizing assembly 4 cannot effectively adjust the pressure, a part of the nitrogen is released through the automatic exhaust function of the relief valve 21, so that the inner cavity chamber 11 of the pressure relief valve 1 is reduced, which can effectively ensure the stability of the pressure. In addition, the control valve unit 2 is also provided with a pressure gauge for detecting the pressure in the pressure relief valve 1.

[0041] In the description of the present application, it should be understood that the terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0042] In addition, the terms "first", "second", and the like are used only for descriptive purposes and not to be construed as indicating or implying relative importance or an indicated number of technical features. Thus, a limitation with "first", "second", and the like features can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless there is a clear specific limitation.

[0043] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure relief valve control device comprising a pressure relief valve provided with an internal cavity chamber and a control valve unit communicating with the internal cavity chamber, characterized in that, The nitrogen storage control assembly is connected with the control valve unit through the first pipeline, and the temperature difference stabilizing assembly is connected with the control valve unit through the second pipeline.

2. The pressure relief valve control device of claim 1, wherein The variable air chamber unit comprises a variable air chamber and fixing plates arranged at both ends of the variable air chamber.

3. The relief valve control device of claim 2, wherein The side wall of the guide cylinder is provided with a limiting groove, and the end of the guide column is provided with a limiting block embedded in the limiting groove.

4. The pressure relief valve control device of claim 3, wherein The side of the variable air chamber is further provided with a plurality of elastic members, and the two ends of the elastic member are connected to the two fixing plates respectively.

5. The pressure relief valve control device of claim 3, wherein The elastic member corresponds to the guide cylinder one by one, and is sleeved on the guide cylinder.

6. The pressure relief valve control device of claim 5, wherein The variable air chamber unit further comprises a third pipeline, one end of the third pipeline is communicated with the variable air chamber, and the other end of the third pipeline extends out of the main tank.

7. The pressure relief valve control device according to any one of claims 2 to 6, characterized by The outer wall of the main tank is covered with a heat preservation layer.

8. The pressure relief valve control device of claim 1, wherein The nitrogen storage control assembly comprises a plurality of nitrogen storage units, and the outlet of the nitrogen storage unit is provided with an electromagnetic control member and a pressure sensor.

9. The pressure relief valve control device of claim 1, wherein The control valve unit comprises a relief valve.

10. The pressure relief valve control device of claim 1, wherein ​

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