High-pressure test equipment

Abstract

The utility model discloses a high pressure test equipment, including frame body, control operation mechanism, gas-liquid separator, vaporizer and heater, control operation mechanism built-in PLC control system, gas-liquid separator is connected with high pressure plunger pump through liquid nitrogen delivery pipeline, the high pressure plunger pump is provided with liquid nitrogen outlet pipeline, vaporizer is provided with the liquid nitrogen outlet pipeline, and the vaporizer is provided with the heater. Under the connection of the damper, the gas inlet pipeline is connected with the vaporizer, and the vaporizer is connected with the heater through a gas outlet pipeline; according to the high-pressure test equipment, liquid nitrogen is directly converted into high-pressure gas with required pressure through the arrangement of the gas-liquid separator, the vaporizer and the heater, and the liquid inlet of the plunger pump adopts the design of the gas-liquid separator, so that flexible, rapid, safe and low-cost pressure test of a high-pressure container and equipment is realized, the limitation of a gas source is reduced, and the test efficiency is improved. And a Dewar flask is used for supplying gas through the vaporizer and the heater, so that the gasification phenomenon of liquid nitrogen is ensured, and the safety and the use efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of pressure testing equipment technology, specifically a high-pressure pressure testing device. Background Technology

[0002] Currently, the working principle of the large-capacity pressure testing equipment with pressure of 100MPa or above used in China is as follows: liquid nitrogen is converted into gaseous high-pressure nitrogen with a pressure of about 20MPa using a high-pressure plunger pump, and then the gas with a pressure of about 20MPa is compressed to more than 100MPa using a special compressor, so as to achieve pressure testing of large-volume high-pressure containers and pipelines.

[0003] The existing equipment has the following disadvantages in actual use: the liquid nitrogen supply method is liquid nitrogen tank truck. When the usage is small and the area is remote, the liquid nitrogen in the connecting hose will rise in temperature and vaporize when the conventional equipment is supplied with liquid nitrogen tank truck. If Dewar bottle is used for gas supply, the vaporization of liquid nitrogen cannot be guaranteed because the pipe is thinner. At the same time, the gas source is limited. Utility Model Content

[0004] The purpose of this invention is to provide a high-pressure testing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-pressure testing device, comprising a frame, a control and operation mechanism, a gas-liquid separator for liquid nitrogen gas-liquid separation, a vaporizer for vaporizing cryogenic liquid nitrogen into gas, and a heater for heating the gas. The control and operation mechanism, gas-liquid separator, vaporizer, and heater are all fixedly installed on the frame. The control and operation mechanism has a built-in PLC control system for controlling the operation of the entire device. The gas-liquid separator is connected to a high-pressure plunger pump through a liquid nitrogen delivery pipeline. The high-pressure plunger pump is equipped with a liquid nitrogen outlet pipeline, which is connected to the vaporizer with the assistance of a damper. The vaporizer is connected to the heater through a gas outlet pipeline.

[0006] Preferably, the gas-liquid separator has a liquid nitrogen inlet pipe connected to it on its surface, and a valve is provided on its surface. The gas-liquid separator is also connected to a pressure sensor, a liquid sensor and a pneumatic valve through pipes. The pneumatic valve is installed on the gas discharge pipe.

[0007] Preferably, the high-pressure plunger pump is installed on one side of the main motor and is connected to the motor for transmission. The high-pressure plunger pump is provided with a gas delivery pipeline, the other end of which is connected to a gas-liquid separator. A valve and a pressure sensor are installed on the gas delivery pipeline.

[0008] Preferably, a temperature display is also installed on the upper surface of the gas-liquid separator.

[0009] Preferably, one side of the bottom of the vaporizer is connected to the liquid nitrogen outlet pipe, and the other side is connected to the gas outlet pipe, forming a process for transporting liquid nitrogen into gas.

[0010] Preferably, an electric heating control panel is installed on the surface of the heater. After the heater heats the gas, it flows out through a gas connection pipe and is connected to an existing device at the end for pressurization.

[0011] Preferably, a pressure gauge and a pressure sensor are installed on the gas connection pipe.

[0012] Preferably, the bottom of the frame is provided with a connecting support frame for supporting the control operation mechanism, gas-liquid separator, vaporizer and heater.

[0013] The beneficial effects of this utility model are:

[0014] This high-pressure testing equipment directly converts liquid nitrogen into high-pressure gas at the required pressure through a gas-liquid separator, vaporizer, and heater. The plunger pump uses a gas-liquid separator design for liquid inlet, and the gas-liquid separator is equipped with a liquid level sensor to achieve automatic PLC control. The liquid nitrogen to gas discharge rate is 240 Nm³ / h, which can realize flexible, fast, safe, and low-cost pressure testing of high-pressure containers and equipment. It reduces the limitation of gas source. The gas is supplied by Dewar flask through vaporizer and heater to ensure the vaporization of liquid nitrogen, save equipment and liquid nitrogen usage costs, and improve safety and efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure and installation of the gas-liquid separator of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure and installation of the high-pressure plunger pump and vaporizer of this utility model;

[0018] Figure 4 This is a schematic diagram of the heater structure and installation of this utility model.

[0019] In the diagram: 1. Frame, 2. Control and operation mechanism, 3. Gas-liquid separator, 4. Vaporizer, 5. Heater, 6. High-pressure plunger pump, 7. Liquid nitrogen outlet pipe, 8. Damper, 9. Gas outlet pipe, 10. Liquid nitrogen inlet pipe, 11. Valve, 12. Pressure sensor, 13. Liquid sensor, 14. Pneumatic valve, 15. Gas discharge pipe, 16. Main motor, 17. Gas delivery pipe, 18. Liquid nitrogen delivery pipe, 19. Temperature display, 20. Electric heating control panel, 21. Gas connection pipe, 22. Pressure gauge, 23. Connecting support frame. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 This utility model provides a technical solution: a high-pressure testing device, including a frame body 1, a control and operation mechanism 2, a gas-liquid separator 3 for separating liquid nitrogen into gas and liquid, a vaporizer 4 for vaporizing low-temperature liquid nitrogen into gas, and a heater 5 for heating the gas. The control and operation mechanism 2, the gas-liquid separator 3, the vaporizer 4, and the heater 5 are all fixedly installed on the frame body 1. Furthermore, the bottom of the frame body 1 is provided with a connecting support frame 23 for supporting the control and operation mechanism 2, the gas-liquid separator 3, the vaporizer 4, and the heater 5.

[0022] Specifically, the control and operation mechanism 2 has a built-in PLC control system for controlling the operation of the entire equipment. A touchscreen is installed on its surface for operation. It can control the equipment's start / stop and alarm functions in real time based on data such as liquid level, temperature, and pressure. It features overpressure alarm and automatic overpressure shutdown functions, ensuring safety. The electrical control system adopts an explosion-proof design and can be used in explosion-proof areas. The circuit control connections in this embodiment are all known to those skilled in the art and will not be described in detail here.

[0023] Specifically, the gas-liquid separator 3 is connected to the high-pressure plunger pump 6 through the liquid nitrogen delivery pipe 18. The high-pressure plunger pump 6 is equipped with a liquid nitrogen outlet pipe 7, and is connected to the vaporizer 4 through the damper 8. The vaporizer 4 is connected to the heater 5 through the gas outlet pipe 9.

[0024] As a preferred technical solution, the gas-liquid separator 3 contains liquid nitrogen, which can achieve the gas-liquid separation effect of liquid nitrogen. The liquid nitrogen is at the bottom and the gas is at the top. The liquid nitrogen is transported to the high-pressure plunger pump 6 through the liquid nitrogen delivery pipe 18, and then transported to the vaporizer (prior technology) 4 through the liquid nitrogen outlet pipe 7 for the next reaction.

[0025] Specifically, the gas-liquid separator 3 has a liquid nitrogen inlet pipe 10 connected to it on its surface, and a valve 11 is installed on its surface. The gas-liquid separator 3 is also connected to a pressure sensor 12, a liquid sensor 13 and a pneumatic valve 14 through pipes. The pneumatic valve 14 is installed on the gas discharge pipe 15.

[0026] As a preferred technical solution, liquid nitrogen is introduced into the gas-liquid separator 3 through the liquid nitrogen inlet pipe 10 for gas-liquid separation. Under the automatic control of the liquid sensor 13 and PLC, when the system detects that the liquid level in the gas-liquid separator 3 is lower than the set value, the pneumatic valve 14 is automatically opened to discharge excess gas through the gas discharge pipe 15, causing the liquid level to rise. When the liquid level rises to the set value, the system automatically closes the pneumatic valve 14 to maintain the liquid level within the set range. When the liquid supply is interrupted or ends, the liquid level in the gas-liquid separator 3 will continue to decrease. When the system detects that the liquid level is lower than the shutdown value, the system will automatically stop operating. In addition, the design of the gas-liquid separator 3 can ensure a continuous supply of liquid nitrogen to the plunger pump under complex conditions, reducing the limitation of the gas source.

[0027] Specifically, the high-pressure plunger pump 6 is installed on one side of the main motor 16 and is connected to the motor 16 for transmission. The high-pressure plunger pump 6 is equipped with a gas delivery pipe 17. The other end of the gas delivery pipe 17 is connected to the gas-liquid separator 3. A valve 11 and a pressure sensor 12 are installed on the gas delivery pipe 17.

[0028] As a preferred technical solution, when liquid nitrogen is delivered to the high-pressure plunger pump 6, some gas will be generated. The gas can be returned to the gas-liquid separator 3 through the gas delivery pipe 17 and discharged according to the liquid level as described above.

[0029] Specifically, a temperature display 19 is also installed on the upper surface of the gas-liquid separator 3.

[0030] Specifically, one side of the bottom of the vaporizer 4 is connected to the liquid nitrogen outlet pipe 7, and the other side is connected to the gas outlet pipe 9, forming a process for converting liquid nitrogen into gas. The vaporizer 4 vaporizes the cryogenic liquid nitrogen into gas by exchanging heat with the air, and then transports it to the heater 5 through the gas outlet pipe 9.

[0031] Specifically, an electric heating control panel 20 is installed on the surface of heater 5. After heating the gas, heater 5 flows out through the gas connection pipe 21 and is connected to existing equipment at the end for pressurization. Heater 5 is an existing electric heating structure with an internal coil containing water. After heating the gas to the set temperature, it is delivered to the existing equipment for pressurization through the gas connection pipe 21.

[0032] Furthermore, a pressure gauge 22, a pressure sensor 12, and a control valve are installed on the gas connection pipe 21 to detect the nitrogen gas inside the gas connection pipe 21.

[0033] In this embodiment, the equipment measures 3.8 meters long, 2.2 meters wide, and 2.5 meters high, weighing 2.6 tons. This facilitates transportation by small vehicles and allows for pressure testing of immovable equipment or containers. For more remote areas, a more flexible Dewar flask can be used for gas supply. In practical use, the liquid nitrogen inlet pipe 10 on the gas-liquid separator 3 is connected to transfer liquid nitrogen into the gas-liquid separator 3. The liquid is then transferred to the liquid sensor 13. Under PLC automatic control, when the system detects that the liquid level in the gas-liquid separator 3 is lower than the set value, it automatically opens the pneumatic valve 14 to discharge excess gas through the gas discharge pipe 15, causing the liquid level to rise. When the liquid level rises to the set value, the system automatically closes the pneumatic valve 14 to maintain the liquid level within the set range. Liquid nitrogen is at the bottom and gas is at the top. Liquid nitrogen is transported to the high-pressure plunger pump 6 through the liquid nitrogen delivery pipe 18, and then to the vaporizer 4 through the liquid nitrogen outlet pipe 7 to vaporize the cryogenic liquid nitrogen into gas. The gas is then transported to the heater 5 through the gas outlet pipe 9. When liquid nitrogen is transported to the high-pressure plunger pump 6, some gas is generated. The gas can be returned to the gas-liquid separator 3 through the gas delivery pipe 17. As described above, the gas is discharged according to the liquid level. After the heater 5 heats the gas to the set temperature, it is transported to the existing equipment for pressure use through the gas connection pipe 21.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure testing device, comprising a frame (1), a control and operation mechanism (2), a gas-liquid separator (3) for gas-liquid separation of liquid nitrogen, a vaporizer (4) for vaporizing cryogenic liquid nitrogen into gas, and a heater (5) for heating the gas, characterized in that: The control operation mechanism (2), gas-liquid separator (3), vaporizer (4) and heater (5) are all fixedly installed on the frame body (1). The control operation mechanism (2) has a built-in PLC control system for controlling the operation of the entire equipment. The gas-liquid separator (3) is connected to the high-pressure plunger pump (6) through the liquid nitrogen delivery pipe (18). The high-pressure plunger pump (6) is provided with a liquid nitrogen outlet pipe (7) and is connected to the vaporizer (4) through the damper (8). The vaporizer (4) is connected to the heater (5) through the gas outlet pipe (9).

2. The high-pressure testing equipment according to claim 1, characterized in that: The gas-liquid separator (3) has a liquid nitrogen inlet pipe (10) connected to it on its surface, and a valve (11) is provided on its surface. The gas-liquid separator (3) is also connected to a pressure sensor (12), a liquid sensor (13) and a pneumatic valve (14) through pipes. The pneumatic valve (14) is installed on the gas discharge pipe (15).

3. The high-pressure testing equipment according to claim 1, characterized in that: The high-pressure plunger pump (6) is installed on one side of the main motor (16) and is connected to the motor (16) for transmission. The high-pressure plunger pump (6) is provided with a gas delivery pipe (17). The other end of the gas delivery pipe (17) is connected to the gas-liquid separator (3). A valve (11) and a pressure sensor (12) are installed on the gas delivery pipe (17).

4. The high-pressure testing equipment according to claim 1, characterized in that: A temperature display (19) is also installed on the upper surface of the gas-liquid separator (3).

5. The high-pressure testing equipment according to claim 1, characterized in that: The bottom side of the vaporizer (4) is connected to the liquid nitrogen outlet pipe (7) and the other side is connected to the gas outlet pipe (9), forming a process of transporting liquid nitrogen into gas.

6. The high-pressure testing equipment according to claim 1, characterized in that: An electric heating control panel (20) is installed on the surface of the heater (5). The heater (5) heats the gas and then flows out through the gas connection pipe (21) and is connected to the existing equipment at the end for pressurization.

7. A high-pressure testing device according to claim 6, characterized in that: A pressure gauge (22) and a pressure sensor (12) are installed on the gas connection pipe (21).

8. A high-pressure testing device according to claim 1, characterized in that: The bottom of the frame (1) is provided with a connecting support frame (23) for supporting the control operation mechanism (2), gas-liquid separator (3), vaporizer (4) and heater (5).

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