An automatic pressure sensitive switch device

Abstract

The utility model relates to an automatic pressure sensing switch device, include: gas collecting bag, control valve and safety valve, the safety valve sets up on the pressure measuring pipeline of vacuum heat insulation cryogenic pressure vessel, the switch of safety valve is linked with the switch of control valve, the inert gas is contained in the gas collecting bag, the gas outlet of gas collecting bag connects the gas inlet of control valve, the gas outlet of control valve is connected to the pneumatic switch of emergency cut -out valve on the pressure increase pipeline of vacuum heat insulation cryogenic pressure vessel, the automatic pressure sensing switch device provided by the utility model carries out safety threshold detection through safety valve, and then controls the opening and closure of the pressure increase pipeline of vacuum heat insulation cryogenic pressure vessel through inert gas source, does not need power supply control, can effectively improve the security, and the device structure is simple, and the operation is simple, and the application scope is wide.

Description

TECHNICAL FIELD

[0001] The utility model relates to an automatic pressure sensing switch device belongs to vacuum heat insulation cryogenic pressure vessel technical field. BACKGROUND

[0002] In the pipeline system of vacuum heat insulation cryogenic pressure vessel, part of the pipeline must be provided with an emergency shut-off valve, and an electromagnetic valve is usually used to control the opening and closing of the emergency shut-off valve. When the vacuum heat insulation cryogenic pressure vessel stores flammable and explosive medium, such as LNG storage tank, liquid hydrogen storage tank, etc., the use of electromagnetic valve to control the opening and closing of the emergency shut-off valve may generate electric spark, and there is an explosion risk. SUMMARY

[0003] The utility model solves technical problem is: overcome above -mentioned technique's shortcoming, provide a kind of automatic pressure sensing switch device without using electronic component.

[0004] To solve the above technical problems, the technical scheme provided by the utility model is: an automatic pressure sensing switch device, comprising: a gas collecting bag, a control valve and a safety valve; the safety valve is arranged on the pressure measuring pipeline of the vacuum heat insulation cryogenic pressure vessel; the opening and closing of the safety valve is linked with the opening and closing of the control valve, when the opening and closing of the safety valve is lifted, the control valve is opened, and when the opening and closing of the safety valve is seated, the control valve is closed; the gas collecting bag contains inert gas; the gas outlet of the gas collecting bag is connected to the gas inlet of the control valve, and the gas outlet of the control valve is connected to the pneumatic switch of the emergency shut-off valve on the pressure increasing pipeline of the vacuum heat insulation cryogenic pressure vessel.

[0005] The further improvement of the above scheme is that the safety valve is a self-resetting safety valve.

[0006] The further improvement of the above scheme is that the control valve is a two-position three-way valve, the control valve has a gas inlet, a gas outlet and an exhaust port; when the control valve is opened, the gas inlet and the gas outlet of the control valve are communicated; when the control valve is closed, the gas outlet and the exhaust port of the control valve are communicated.

[0007] The further improvement of the above scheme is that the exhaust port of the control valve is connected to the exhaust pipeline of the vacuum heat insulation cryogenic pressure vessel through a first check valve.

[0008] The further improvement of the above scheme is that the opening and closing of the safety valve and the opening and closing of the control valve are both equipped with joints, and the two joints are linked through a gap.

[0009] The further improvement of the above scheme is that the gas outlet of the safety valve is connected to the exhaust pipeline of the vacuum heat insulation cryogenic pressure vessel.

[0010] The further improvement of the scheme is that the gas outlet of the safety valve is connected to a pipeline of the exhaust pipeline of the vacuum adiabatic cryogenic pressure container, and a second check valve is arranged.

[0011] The automatic pressure sensing switch device provided by the utility model has safety threshold detection through the safety valve, and has opening and closing of the pressurizing pipeline of the inert gas source vacuum adiabatic cryogenic pressure container without power supply control, so that safety can be effectively improved, the device has simple structure, convenient operation and wide application range. BRIEF DESCRIPTION OF DRAWINGS

[0012] The utility model will be further described in connection with the drawings.

[0013] Figure 1 It is a preferred embodiment structure schematic diagram of the utility model.

[0014] Figure 2 It is a use state structure schematic diagram of a preferred embodiment of the utility model.

[0015] The reference numerals in the drawing are as follows: 1 is a gas collecting bag, 2 is a control valve, 3 is a safety valve, 4 is a safety valve root valve, 5 is an emergency cut-off valve pneumatic switch, 6 is a pressure measuring pipeline, 7 is a pressurizing pipeline, 8 is an exhaust pipeline, 9 is a check valve, 10 is a vacuum adiabatic cryogenic pressure container, 201 is a control valve gas inlet, 202 is a control valve gas outlet, 203 is a control valve exhaust port, 204 is a control valve joint, 301 is a safety valve joint, and 302 is a safety valve outlet pipeline. DETAILED DESCRIPTION

[0016] Embodiment: the automatic pressure sensing switch device of the embodiment, like Figure 1 and Figure 2As shown, the system includes: a gas collection chamber 1, a control valve 2, and a safety valve 3. The safety valve 3 is a self-resetting safety valve, with its inlet connected to the outlet of the safety valve root valve 4 on the pressure testing line 6 of the vacuum-insulated cryogenic pressure vessel 10. The control valve 2 is a two-position three-way valve with an inlet 201, an outlet 202, and an exhaust port 203. The inlet 201 is connected to the gas collection chamber 1, and the outlet 202 is connected to the pneumatic switch 5 of the emergency shut-off valve on the pressurization line 7 of the vacuum-insulated cryogenic pressure vessel 10. The safety valve 3 switch has a connector 301, and the corresponding control valve 2 switch has a connector 204. Connectors 301 and 204 are fixed together by a gap, enabling the control valve 2 and safety valve 3 to operate in tandem. The tripping threshold of the safety valve 3 is consistent with the maximum permissible working pressure of the vacuum-insulated cryogenic pressure vessel 10. When safety valve 3 trips, control valve 2 is activated, connecting its inlet and outlet. When safety valve 3 reseats, control valve 2 is activated, connecting its outlet and exhaust. The gas collection chamber 1 stores inert gas at a certain pressure, with its internal pressure greater than or equal to the driving pressure of the pneumatic switch 5 of the emergency shut-off valve.

[0017] When the vacuum-insulated cryogenic pressure vessel 10 is in normal operation, opening the safety valve root valve 4 activates the automatic pressure-sensing switch device in this embodiment. When the pressure inside the vacuum-insulated cryogenic pressure vessel 10 reaches the maximum allowable working pressure, the safety valve 3 trips, the control valve 2 actuates, and the pressurized gas source in the gas collection bag 1 drives the emergency shut-off valve pneumatic switch 5 on the pressurization pipeline 7 to close through the control valve 2, stopping the pressurization of the vacuum-insulated cryogenic pressure vessel 10 by the pressurization pipeline 7. When the pressure inside the vacuum-insulated cryogenic pressure vessel 10 decreases, the safety valve 3 reseats, the control valve 2 actuates again, and the outlet 202 of the control valve 2 connects to the exhaust port 203. The inert gas in the pipeline connected to the outlet 202 is released through the exhaust port 203, causing the emergency shut-off valve pneumatic switch 5 on the pressurization pipeline 7 to lose pressure and thus open, repressurizing the vacuum-insulated cryogenic pressure vessel 10.

[0018] To prevent gas contamination, the outlet 302 of safety valve 3 is connected to the exhaust pipe 8 of the vacuum-insulated cryogenic pressure vessel 10, and the exhaust port 203 of control valve 2 is also connected to the exhaust pipe 8 of the vacuum-insulated cryogenic pressure vessel 10. Both are equipped with check valves 9 to prevent gas backflow. The final outlet of the exhaust pipe 8 of the vacuum-insulated cryogenic pressure vessel 10 is equipped with a purification device to prevent the emitted gas from causing contamination.

[0019] This utility model is not limited to the specific technical solutions described in the above embodiments. Besides the above embodiments, this utility model may have other implementation methods. All technical solutions formed by equivalent substitutions are within the protection scope of this utility model.

Claims

1. An automatic pressure-sensing switch device, characterized in that, include: The system includes a gas collection chamber, a control valve, and a safety valve. The safety valve is installed on the pressure testing pipeline of the vacuum-insulated cryogenic pressure vessel. The switch of the safety valve is linked to the switch of the control valve. When the safety valve is activated, the control valve opens; when the safety valve is deactivated, the control valve closes. The gas collection chamber contains inert gas. The outlet of the gas collection chamber is connected to the inlet of the control valve, and the outlet of the control valve is connected to the pneumatic switch of the emergency shut-off valve on the pressurization pipeline of the vacuum-insulated cryogenic pressure vessel.

2. The automatic pressure-sensing switch device according to claim 1, characterized in that: The safety valve is a self-resetting safety valve.

3. The automatic pressure-sensing switch device according to claim 2, characterized in that: The control valve is a two-position three-way valve, which has an air inlet, an air outlet, and an exhaust port. When the control valve is open, the air inlet and the air outlet of the control valve are connected. When the control valve is closed, the air outlet and the exhaust port of the control valve are connected.

4. The automatic pressure-sensing switch device according to claim 3, characterized in that: The exhaust port of the control valve is connected to the exhaust pipe of the vacuum-insulated cryogenic pressure vessel through a first check valve.

5. The automatic pressure-sensing switch device according to claim 4, characterized in that: Both the safety valve switch and the control valve switch are equipped with connectors, and the two connectors are fixed by a gap to achieve linkage.

6. The automatic pressure-sensing switch device according to claim 5, characterized in that: The outlet of the safety valve is connected to the exhaust pipe of the vacuum-insulated cryogenic pressure vessel.

7. The automatic pressure-sensing switch device according to claim 6, characterized in that: The outlet of the safety valve is connected to the exhaust pipe of the vacuum-insulated cryogenic pressure vessel, and a second check valve is installed on the pipe.

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