A cold storage pressure testing system

Abstract

The present application discloses a cold storage pressure testing system applied to the field of pressure testing, wherein the testing system is provided with a recovery tank and other devices. After the test of the tested tube is completed, the pressure relief control valve is opened to guide the high-pressure nitrogen inside the tested tube into the recovery tank through the pressure relief pipe to recover the nitrogen, thereby avoiding the waste of nitrogen. At the same time, the drainage control valve and the water pump are opened, the water inlet control valve is closed, and the interior of the tested tube is filled with replacement fluid. At this time, the nitrogen remaining in the tested tube can be completely squeezed into the interior of the recovery tank, and then the pressure relief control valve is closed, and the exhaust control valve is opened to enable the water pump to draw the replacement fluid inside the tested tube back to the interior of the liquid storage tank, and the exhaust control valve and the drainage control valve are closed. Finally, the tested tube is removed from the upper connecting plate and the lower connecting plate. Through the above-mentioned arrangement, the nitrogen remaining in the tested tube can be further recovered, thereby greatly avoiding the waste of nitrogen.

Description

Technical Field

[0001] The present application relates to the field of pressure testing, and in particular to a cold storage pressure testing system. Background Art

[0002] A cold storage device is a regenerative heat exchanger in which the fluid undergoes periodic alternating flow, with hot and cold fluids alternately exchanging heat with the cold storage medium in the heat exchanger. In the low-temperature cycle, it achieves the purpose of accumulating cold through heat exchange.

[0003] The core components of the cold storage device need to be able to withstand a certain amount of pressure. Therefore, before assembly, the components need to be pressure tested to determine whether the product is qualified, avoiding the need for rework and replacement of parts due to unqualified products after assembly.

[0004] Pressure detection uses air pressure detection. Nitrogen is filled inside the forward component and then pressurized using a compressor. It is generally equipped with a nitrogen recovery function. However, not all nitrogen can be recovered during the nitrogen recovery process, or the recovered nitrogen is mixed with a lot of impurities, so further improvement is needed. Summary of the Invention

[0005] The purpose of the present application is to improve the recovery effect of nitrogen during pressure detection. Compared with the existing technology, a cold storage pressure testing system is provided, which includes an integrated controller and a nitrogen tank, and also includes an upper connecting plate, a lower connecting plate, a tested pipe and a recovery tank. The upper connecting plate and the lower connecting plate are sealed and fixedly connected to the top and bottom ends of the tested pipe respectively. The top end of the upper connecting plate is fixedly connected to a bronchial pipe and a pressure relief pipe. A main air pipe is fixedly connected between the output end of the nitrogen tank and the bronchial pipe. The outer wall of the main air pipe is fixedly connected to a main control valve and a compressor, and the integrated controller can control the opening and closing of the main control valve and the compressor. The end of the pressure relief pipe away from the upper connecting plate is fixedly connected to the top end of the recovery tank, the outer wall of the pressure relief pipe is fixedly connected to the pressure relief control valve, and the integrated controller can control the opening and closing of the pressure relief control valve. The bottom end of the lower connecting plate is fixedly connected to a pressure sensor, and the pressure sensor is electrically connected to the integrated controller.

[0006] A method for detecting a cold storage pressure test system comprises the following steps:

[0007] S1. Place the pipe to be tested between the upper connecting plate and the lower connecting plate, and seal and fix them together;

[0008] S2. The integrated controller closes the pressure relief control valve, opens the main control valve, and allows the nitrogen in the nitrogen tank to flow into the tested pipe through the compressor, main gas pipe, and bronchial pipe in sequence, and then closes the main control valve.

[0009] S3, the integrated controller starts the compressor to apply pressure to the inside of the measured pipe, and the pressure sensor records the change in the pressure value inside the measured pipe and transmits it back to the integrated controller;

[0010] S4. The integrated controller opens the pressure relief control valve to guide the high-pressure nitrogen inside the measured tube into the recovery tank through the pressure relief pipe to recover the nitrogen. The measured tube is removed from the upper and lower connecting plates, and a new measured tube is installed for testing. The data recorded by the pressure sensor is saved in the integrated controller, thereby achieving complete recovery of the nitrogen used in the test and avoiding waste of nitrogen.

[0011] Furthermore, a liquid storage tank is provided on one side of the nitrogen tank, and a water inlet pipe and a drain pipe are fixedly connected between the top and bottom ends of the liquid storage tank and the lower connecting plate respectively.

[0012] Furthermore, the outer walls of the water inlet pipe and the drain pipe are fixedly connected with a water inlet control valve and a drain control valve respectively, and the outer wall of the drain pipe is also fixedly connected with a water pump. The water pump, the water inlet control valve and the drain control valve are all electrically connected to the integrated controller.

[0013] Furthermore, the interior of the liquid storage tank is filled with replacement fluid, and an exhaust control valve is fixedly installed on the side wall of the bronchus, and the exhaust control valve is electrically connected to the integrated controller; through the above arrangement, the interior of the measured tube can be filled with high-purity nitrogen, which increases the stability of the measured tube when the pressure is increased; at the same time, the nitrogen remaining in the measured tube can be further recovered, greatly avoiding the waste of nitrogen.

[0014] Furthermore, the volume of the liquid storage tank is larger than the volume of the tested tube, and a liquid level sensor is fixedly connected to the inner wall of the top of the upper connecting plate, and the liquid level sensor is electrically connected to the integrated controller; through the above arrangement, the replacement fluid in the tested tube is prevented from escaping through the bronchus.

[0015] Furthermore, a heating rod is fixedly connected to the middle of the upper connecting plate, and the heating rod extends to the inside of the measured tube; through the above arrangement, not only the replacement fluid remaining in the measured tube can be removed, increasing the stability of the measured tube during pressurization, but also avoiding the waste of replacement fluid.

[0016] Furthermore, a temperature sensor is fixedly connected to the inner wall of the upper connecting plate, and the temperature sensor is electrically connected to the integrated controller. Through the above arrangement, the situation in which water vapor cannot be discharged due to insufficient pressure inside the measured tube is avoided.

[0017] Furthermore, an auxiliary tank is fixedly connected to the side wall of the recovery tank, a through slot is opened between the auxiliary tank and the recovery tank, and the through slot is located at the lower side of the recovery tank and the auxiliary tank.

[0018] Furthermore, the top of the recovery tank is fixedly connected with a butt joint, and the outer wall of the butt joint is fixedly connected with an air valve.

[0019] Furthermore, a pressure rod is fixedly connected to the inner wall of the top of the auxiliary tank, and the interior of the recovery tank and the auxiliary tank are filled with a gas-pushing liquid; through the above arrangement, the recovery tank can recover high-concentration nitrogen, and it is convenient to discharge the nitrogen in the recovery tank through the docking pipe.

[0020] Compared with the existing technology, the advantages of this application are:

[0021] (1) The test system is provided with a recovery tank and other devices. After the test of the tested tube is completed, the pressure relief control valve is opened to guide the high-pressure nitrogen inside the tested tube into the recovery tank through the pressure relief pipe to recover the nitrogen, thereby avoiding the waste of nitrogen. At the same time, the drainage control valve and the water pump are opened, the water inlet control valve is closed, and the replacement fluid is filled into the tested tube. At this time, the nitrogen remaining in the tested tube can be completely squeezed into the recovery tank. Then the pressure relief control valve is closed, the exhaust control valve is opened, and the water pump is opened to pump the replacement fluid inside the tested tube back to the liquid storage tank. The exhaust control valve and the drainage control valve are closed, and the tested tube can be removed from the upper connecting plate and the lower connecting plate. Through the above settings, the nitrogen remaining in the tested tube can be further recovered, greatly avoiding the waste of nitrogen.

[0022] (2) The interior of the liquid storage tank is filled with replacement fluid, and an exhaust control valve is fixedly installed on the side wall of the bronchus, and the exhaust control valve is electrically connected to the integrated controller; through the above arrangement, the interior of the measured tube can be filled with high-purity nitrogen, which increases the stability of the measured tube when the pressure is increased; at the same time, the nitrogen remaining in the measured tube can be further recovered, which greatly avoids the waste of nitrogen.

[0023] (3) The volume of the liquid storage tank is larger than the volume of the tube being tested, and a liquid level sensor is fixedly connected to the inner wall of the top of the upper connecting plate, and the liquid level sensor is electrically connected to the integrated controller; through the above arrangement, the replacement fluid in the tube being tested is prevented from escaping through the bronchus.

[0024] (4) A heating rod is fixedly connected to the middle of the upper connecting plate, and the heating rod extends to the inside of the measured tube. Through the above arrangement, not only can the replacement fluid remaining in the measured tube be removed, thereby increasing the stability of the measured tube during pressure increase, but also the waste of replacement fluid can be avoided.

[0025] (5) A temperature sensor is fixedly connected to the inner wall of the upper connecting plate, and the temperature sensor is electrically connected to the integrated controller. Through the above arrangement, the situation in which water vapor cannot be discharged due to insufficient pressure inside the measured tube is avoided.

[0026] (6) A pressure rod is fixedly connected to the inner wall of the top of the auxiliary tank, and the interior of the recovery tank and the auxiliary tank are filled with a gas-pushing liquid; through the above arrangement, the recovery tank can recover high-concentration nitrogen, and it is convenient to discharge the nitrogen in the recovery tank through the docking pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the appearance diagram of this application;

[0028] Figure 2 This is the internal structure diagram of this application;

[0029] Figure 3 This is a structural diagram of the upper connecting plate of this application;

[0030] Figure 4 This is a state diagram when the replacement fluid of this application is pumped into the tested tube;

[0031] Figure 5 This is a state diagram of the nitrogen inside the test tube being discharged into the recovery tank;

[0032] Figure 6 This is a state diagram of the pressurizing rod pushing gas and liquid when it is started in this application.

[0033] Description of the numbers in the figure:

[0034] 1. Nitrogen tank; 2. Bronchial pipe; 201. Exhaust control valve; 3. Main air pipe; 301. Main control valve; 4. Upper connecting plate; 401. Lower connecting plate; 5. Pressure relief pipe; 501. Pressure relief control valve; 6. Compressor; 7. Liquid storage tank; 8. Water inlet pipe; 801. Water inlet control valve; 9. Drain pipe; 901. Drain control valve; 10. Water pump; 11. Liquid level sensor; 12. Temperature sensor; 13. Heating rod; 14. Recovery tank; 15. Auxiliary tank; 16. Through groove; 17. Pressurizing rod; 18. Pressure sensor; 19. Butt joint; 1901. Air valve; 20. Tested pipe. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] Example 1:

[0037] This application discloses a cold storage pressure test system, please refer to Figure 1-2, including an integrated controller and a nitrogen tank 1, and also including an upper connecting plate 4, a lower connecting plate 401, a measured tube 20 and a recovery tank 14, the upper connecting plate 4 and the lower connecting plate 401 are respectively sealed and fixedly connected to the top and bottom ends of the measured tube 20, the top of the upper connecting plate 4 is fixedly connected to the bronchial tube 2 and the pressure relief pipe 5, a main air pipe 3 is fixedly connected between the output end of the nitrogen tank 1 and the bronchial tube 2, the outer wall of the main air pipe 3 is fixedly connected to the main control valve 301 and the compressor 6, and the integrated controller can control the opening and closing of the main control valve 301 and the compressor 6, one end of the pressure relief pipe 5 away from the upper connecting plate 4 is fixedly connected to the top of the recovery tank 14, the outer wall of the pressure relief pipe 5 is fixedly connected to the pressure relief control valve 501 and the integrated controller can control the opening and closing of the pressure relief control valve 501, the bottom end of the lower connecting plate 401 is fixedly connected to the pressure sensor 18, and the pressure sensor 18 is electrically connected to the integrated controller;

[0038] A method for detecting a cold storage pressure test system comprises the following steps:

[0039] S1. Place the tube 20 to be tested between the upper connecting plate 4 and the lower connecting plate 401 and seal and securely connect them.

[0040] S2. The integrated controller closes the pressure relief control valve 501 and opens the main control valve 301 to allow the nitrogen in the nitrogen tank 1 to flow into the interior of the tested tube 20 through the compressor 6, the main gas pipe 3, and the bronchial pipe 2 in sequence, and then closes the main control valve 301.

[0041] S3, the integrated controller starts the compressor 6 to apply pressure to the inside of the measured tube 20, and the pressure sensor 18 records the change in the pressure value inside the measured tube 20 and transmits it back to the integrated controller;

[0042] S4. The integrated controller opens the pressure relief control valve 501 to guide the high-pressure nitrogen inside the measured tube 20 into the recovery tank 14 through the pressure relief pipe 5 to recover the nitrogen. The measured tube 20 is removed from the upper connecting plate 4 and the lower connecting plate 401, and a new measured tube 20 is installed for testing. The data recorded by the pressure sensor 18 is stored in the integrated controller.

[0043] See also Figure 2-6A liquid storage tank 7 is provided on one side of the nitrogen tank 1. The top and bottom ends of the liquid storage tank 7 are fixedly connected to the lower connecting plate 401 with a water inlet pipe 8 and a drain pipe 9. The outer walls of the water inlet pipe 8 and the drain pipe 9 are fixedly connected with a water inlet control valve 801 and a drain control valve 901 respectively. The outer wall of the drain pipe 9 is also fixedly connected with a water pump 10. The water pump 10, the water inlet control valve 801 and the drain control valve 901 are all electrically connected to the integrated controller. The interior of the liquid storage tank 7 is filled with replacement fluid. The side wall of the bronchus 2 is fixedly installed with an exhaust control valve 201, and the exhaust control valve 201 is electrically connected to the integrated controller. Before the main control valve 301 is opened, the exhaust control valve 201 and the drain control valve 901 are opened through the integrated controller, the water inlet control valve 801 is closed, and the water pump 10 is started to fill the replacement fluid in the liquid storage tank 7 into the inside of the tested tube 20 through the drain pipe 9. At this time, the air inside the tested tube 20 is squeezed and discharged through the bronchus 2. When the inside of the tested tube 20 is filled with the replacement fluid and the gas inside the tested tube 20 is completely discharged, the water pump 10, the drain control valve 901 and the exhaust control valve 201 are closed, and when the main control valve 301 is opened, the water inlet control valve 801 is closed. 801 is also opened, the nitrogen will squeeze the replacement fluid inside the tested tube 20 back into the liquid storage tank 7 through the water inlet pipe 8, and then the water inlet pipe 8 is closed. Through the above arrangement, the interior of the tested tube 20 can be filled with high-purity nitrogen, which increases the stability of the tested tube 20 when the pressure is increased; similarly, after the test of the tested tube 20 is completed, the pressure relief control valve 501 is opened, and the high-pressure nitrogen inside the tested tube 20 is discharged to the inside of the recovery tank 14 through the pressure relief pipe 5. At this time, nitrogen will still remain in the tested tube 20. At this time, the drainage control valve 901 and the water pump 10 can be opened, and the water inlet control valve 8 can be closed. 01, fill the interior of the tested tube 20 with replacement fluid. At this time, the residual nitrogen in the tested tube 20 can be completely squeezed into the interior of the recovery tank 14, and then close the pressure relief control valve 501, open the exhaust control valve 201, and make the water pump 10 pump the replacement fluid in the tested tube 20 back to the interior of the liquid storage tank 7, and close the exhaust control valve 201 and the drain control valve 901, and then the tested tube 20 can be removed from the upper connecting plate 4 and the lower connecting plate 401. Through the above settings, the residual nitrogen in the tested tube 20 can be further recovered, which greatly avoids the waste of nitrogen.

[0044] Example 2:

[0045] See also Figure 2-6The volume of the liquid storage tank 7 is larger than the volume of the measured tube 20. The inner wall of the top of the upper connecting plate 4 is fixedly connected with a liquid level sensor 11, and the liquid level sensor 11 is electrically connected to the integrated controller; the liquid level sensor 11 can sense the change of the liquid level in the measured tube 20. When the liquid level of the replacement fluid in the measured tube 20 rises to the position of the liquid level sensor 11, the liquid level sensor 11 sends an electrical signal to the integrated controller to close the exhaust control valve 201. Through the above arrangement, the replacement fluid in the measured tube 20 is prevented from escaping through the bronchus 2.

[0046] See also Figure 2-6 , a heating rod 13 is fixedly connected to the middle part of the upper connecting plate 4, and the heating rod 13 extends to the interior of the tested tube 20; when the replacement fluid in the tested tube 20 is discharged back to the interior of the liquid storage tank 7, there will be replacement fluid residue on the inner wall of the tested tube 20, and at this time the heating rod 13 can be started to heat the interior of the tested tube 20 to evaporate the replacement fluid. After the replacement fluid evaporates, the pressure relief control valve 501 can be opened to discharge water vapor and part of the nitrogen into the interior of the recovery tank 14 through the pressure relief pipe 5, which can not only remove the replacement fluid remaining in the tested tube 20 and increase the stability of the tested tube 20 when the pressure is increased, but also further avoid the waste of replacement fluid, and the replacement fluid residue on the inner wall of the tested tube 20 can be removed. After all the liquid is removed, the pressure relief control valve 501 is closed and the pressure test of the tested tube 20 is performed normally. The inner wall of the upper connecting plate 4 is fixedly connected with a temperature sensor 12, and the temperature sensor 12 is electrically connected to the integrated controller. When the heating rod 13 is heated and the heating rod 13 is heated to a certain temperature, the replacement liquid on the inner wall of the tested tube 20 is completely evaporated, and the pressure inside the tested tube 20 is high due to the heating. At this time, the integrated controller opens the pressure relief control valve 501, and the water vapor and part of the nitrogen inside the tested tube 20 can be discharged into the interior of the recovery tank 14 under the action of pressure, thereby avoiding the situation where the water vapor inside the tested tube 20 cannot be discharged due to insufficient pressure.

[0047] See also Figure 2-6, the side wall of the recovery tank 14 is fixedly connected with an auxiliary tank 15, and a through groove 16 is opened between the auxiliary tank 15 and the recovery tank 14, and the through groove 16 is located at the lower side of the recovery tank 14 and the auxiliary tank 15. The top of the recovery tank 14 is fixedly connected with a docking pipe 19, and the outer wall of the docking pipe 19 is fixedly connected with an air valve 1901, and the inner wall of the top of the auxiliary tank 15 is fixedly connected with a pressurizing rod 17. The interior of the recovery tank 14 and the auxiliary tank 15 are filled with a gas-pushing liquid; when the recovery tank 14 is initially used, the gas valve 1901 is opened, and then the pressurizing rod 17 is started. At this time, the air inside the auxiliary tank 15 When heated, its pressure increases, and the air-pushing liquid inside the auxiliary tank 15 is squeezed into the inside of the recovery tank 14. At this time, the air-pushing liquid level inside the recovery tank 14 rises, and the air inside the recovery tank 14 is completely discharged through the docking tube 19, and then the air valve 1901 and the pressurizing rod 17 are closed. At this time, the nitrogen discharged from the pressure relief pipe 5 to the inside of the recovery tank 14 will not be mixed with air, so that the recovery tank 14 can recover high-concentration nitrogen. Similarly, when the nitrogen inside the recovery tank 14 needs to be discharged, the pressurizing rod 17 and the air valve 1901 can be opened to discharge the nitrogen from the docking tube 19.

[0048] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed in the present application based on the technical solution and its improved ideas, which should be covered by the scope of protection of the present application.

Claims

1. A cold storage pressure test system, comprising an integrated controller and a nitrogen tank (1), characterized in that: The apparatus further comprises an upper connecting plate (4), a lower connecting plate (401), a test tube (20) and a recovery tank (14), wherein the upper connecting plate (4) and the lower connecting plate (401) are respectively sealed and fixedly connected to the top and bottom ends of the test tube (20), the top end of the upper connecting plate (4) is fixedly connected to a bronchial tube (2) and a pressure relief tube (5), a main gas pipe (3) is fixedly connected between the output end of the nitrogen tank (1) and the bronchial tube (2), and the outer wall of the main gas pipe (3) is fixedly connected to a main control valve (301) and a compressor. The compressor (6) is connected to the pressure relief pipe (5), and the integrated controller controls the opening and closing of the main control valve (301) and the compressor (6); one end of the pressure relief pipe (5) away from the upper connecting plate (4) is fixedly connected to the top of the recovery tank (14); the outer wall of the pressure relief pipe (5) is fixedly connected to the pressure relief control valve (501), and the integrated controller controls the opening and closing of the pressure relief control valve (501); the bottom end of the lower connecting plate (401) is fixedly connected to the pressure sensor (18), and the pressure sensor (18) is electrically connected to the integrated controller; A liquid storage tank (7) is provided on one side of the nitrogen tank (1), and a water inlet pipe (8) and a drain pipe (9) are fixedly connected between the top and bottom ends of the liquid storage tank (7) and the lower connecting plate (401), respectively. The interior of the liquid storage tank (7) is filled with a replacement fluid, and an exhaust control valve (201) is fixedly installed on the side wall of the bronchus (2), and the exhaust control valve (201) is electrically connected to the integrated controller; The side wall of the recovery tank (14) is fixedly connected to the auxiliary tank (15), a through groove (16) is opened between the auxiliary tank (15) and the recovery tank (14), and the through groove (16) is located at the lower side of the recovery tank (14) and the auxiliary tank (15). The top of the recovery tank (14) is fixedly connected to a docking tube (19), the outer wall of the docking tube (19) is fixedly connected to an air valve (1901), and the inner wall of the top of the auxiliary tank (15) is fixedly connected to a pressurizing rod (17). The interiors of the recovery tank (14) and the auxiliary tank (15) are both filled with a propelling liquid.

2. A cold storage pressure testing system according to claim 1, characterized in that: The outer walls of the water inlet pipe (8) and the drainage pipe (9) are fixedly connected to a water inlet control valve (801) and a drainage control valve (901), respectively. The outer wall of the drainage pipe (9) is also fixedly connected to a water pump (10). The water pump (10), the water inlet control valve (801), and the drainage control valve (901) are all electrically connected to the integrated controller.

3. The cold storage pressure testing system according to claim 1, characterized in that: The volume of the liquid storage tank (7) is larger than the volume of the measured tube (20), and a liquid level sensor (11) is fixedly connected to the inner wall of the top end of the upper connecting plate (4), and the liquid level sensor (11) is electrically connected to the integrated controller.

4. The cold storage pressure testing system according to claim 1, characterized in that: A heating rod (13) is fixedly connected to the middle of the upper connecting plate (4), and the heating rod (13) extends into the interior of the measured tube (20).

5. The cold storage pressure testing system according to claim 1, characterized in that: A temperature sensor (12) is fixedly connected to the inner wall of the upper connecting plate (4), and the temperature sensor (12) is electrically connected to the integrated controller.

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