Tank-type air bag pressurization leak detection device and use method thereof

Abstract

A tank type air bag pressurization leak detection device comprises a closed tank body, an air bag is arranged in the tank body, a liquid inlet and a liquid outlet are formed in the tank body, the liquid inlet is connected with a liquid inlet pipe, and the liquid outlet is connected with first equipment to be subjected to leak detection; the air bag is provided with an air inlet and an air outlet, the air inlet is connected with the air inlet pipe, the air outlet is connected with a second to-be-detected device, the first to-be-detected device performs water pressure leakage detection, and the second to-be-detected device performs air pressure leakage detection; the liquid inlet pipe and the air inlet pipe are connected with a water source and an air source respectively, and the air source is a pressurized air source. The technical problem to be solved by the invention is to provide the tank-type air bag pressurization leak detection device and method, the tank-type air bag pressurization leak detection device is used for replacing manual and electric pressurization leak detection devices, pressurization leak detection of various devices is further standardized, the operation risk is reduced, the construction efficiency is improved, and the labor intensity of workers is reduced. Safe and efficient pressurization leak detection of equipment such as a generator (except a speed regulating system and a high-pressure oil system), a transformer cooler and the like is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of transformer maintenance, in particular to a tank-type airbag pressurized leak detection device and a use method thereof. Background Art

[0002] During the operation of the generator set, except for the operating pressure of the transmission hydraulic mechanism related to the speed control system, which can reach up to 6Mpa, and the operating pressure of the bearing high-pressure oil system, which can reach up to 30Mpa, the operating pressure of the related cooling and lubrication system, the generator water-cooling wire rod, and the main transformer cooling system are all within 1Mpa. Therefore, when the generator set is overhauled, except for the leakage detection pressure of the transmission hydraulic mechanism related to the speed control system, which is as high as 1.5×6Mpa=9Mpa, the leakage detection pressure of the high-pressure oil system is as high as 1.5×30Mpa=45Mpa, and the leakage detection pressure of the generator water-cooling wire rod is 1.2Mpa, the leakage detection pressure of the main transformer and other equipment of the unit is within 0.5Mpa, and the pressure holding time does not exceed 30 minutes. In addition, the operating pressure of SF6 equipment such as GIS and GIL is about 0.5Mpa, and the leakage rate measured after vacuuming is generally used to judge whether the equipment is leaking.

[0003] In order to check and confirm whether the equipment is leaking, the water circuit of the main transformer oil-water cooler is generally manually filled with water for leak detection, the oil circuit is generally manually filled with N2 or dry air for leak detection, and the unit is generally pressurized for leak detection by oil pump or water pump. Regardless of whether water filling, oil filling, or air filling is used for leak detection, since the pressurization device is not equipped with relevant safety valves, pressure limiting valves, solenoid valves, etc., the pressurization and time are all controlled manually, so that the leak detection test not only has the risk of equipment damage and personal injury caused by excessive pressure and long pressurization time, but also has problems such as low work efficiency and poor operability. In order to ensure the safe and efficient completion of the pressurization leak detection of other related equipment of the unit and related equipment such as the main transformer cooler except the speed control system and high-pressure oil system, it is necessary to design a tank airbag pressurization device that can automatically control the pressure and pressurization time, is easy to operate and move, and does not require electric pressurization, so as to meet the leak detection needs of equipment with a leak detection pressure not exceeding 1.5 Mpa. In addition, when necessary, SF6 equipment such as GIS and GIL can also be judged by the N2 filling to determine whether the equipment is leaking. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a tank-type airbag pressurized leak detection device and a method of using the same. The tank-type airbag pressurized leak detection device replaces the manual and electric pressurized leak detection devices, further standardizes the pressurized leak detection of various equipment, reduces the operation risk, improves the construction efficiency, ensures the safe and efficient pressurized leak detection of equipment such as generators (except the speed control system and the high-pressure oil system) and transformer coolers, as well as the pressurized leak detection of various other equipment with a leak detection pressure not exceeding 1.5 Mpa, and effectively prevents equipment damage and personal injury.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a tank-type airbag pressurized leak detection device, comprising a closed tank body, an airbag is arranged in the tank body, a liquid inlet and a liquid discharge port are arranged on the tank body, the liquid inlet is connected to the liquid inlet pipe, and the liquid discharge port is connected to the first device to be leak detected; an air inlet and an exhaust port are arranged on the airbag, the air inlet is connected to the air inlet pipe, and the exhaust port is connected to the second device to be leak detected, the first device to be leak detected performs water pressure leak detection, and the second device to be leak detected performs air pressure leak detection; the liquid inlet pipe and the air inlet pipe are respectively connected to a water source and an air source, and the air source is a pressurized air source.

[0006] Preferably, the liquid inlet pipe is provided with a first solenoid valve, the liquid outlet is connected to a third ball valve, and then connected to the first leak detection device through a connecting water pipe; a third pressure limiting valve and a second pressure gauge are provided on the connecting water pipe.

[0007] Preferably, the connecting water pipe is also connected to the third safety valve, the fourth ball valve and the third solenoid valve.

[0008] Preferably, an equipment water injection pipe is connected between the input end of the first solenoid valve and the output end of the third ball valve, and a fifth ball valve is provided on the equipment water injection pipe.

[0009] Preferably, both ends of the connecting water pipe are connected to the third ball valve and the first leak detection device through flange interfaces.

[0010] Preferably, the tank body is arranged on an electronic scale.

[0011] Preferably, a first pressure limiting valve is provided on the air inlet pipe, and the air outlet is connected to the second leak detection device via a connecting air pipe; a second pressure limiting valve and a first pressure gauge are provided on the connecting air pipe.

[0012] Preferably, the connecting air pipe is also connected to the second safety valve, the second ball valve and the second solenoid valve.

[0013] Preferably, both ends of the connecting air pipe are connected to the exhaust port and the second leak detection device through self-sealing interfaces.

[0014] Preferably, the airbag is also connected to a protective air pipe, and the protective air pipe is connected to the first ball valve and the first safety valve.

[0015] A method for using a tank-type airbag pressurized leak detection device comprises the following steps: Step 1: Connect the device; Step 2: Fill the tank to half full with water; Step 3: If the equipment to be inspected needs water replenishment, replenish water through the spare water pipe; Step 4: Inflate the airbag and build up a corresponding pressure, the pressure value of which is lower than the pressure resistance of the airbag and the tank.

[0016] Step 5: For the equipment to be inspected that is filled with water, first open or close other related valves, then open the third ball valve and fill the equipment to be inspected with water through the tank, and then gradually open the third pressure-limiting valve to the set limit position; if the equipment to be inspected leaks and cannot be pressurized to the preset value, close the related valves to stop filling with water, and manually drain and release the pressure through the fourth ball valve; if the value of the second pressure gauge 11 drops significantly during the pressure holding period after the equipment to be inspected is pressurized to the preset value, indicating that the equipment sealing test is unqualified, then manually drain and release the pressure through the fourth ball valve; if the water pressure of the equipment to be inspected gradually increases to the set value, the value of the second pressure gauge does not change during the pressure holding period, and after the pressure is maintained for the set time, the third solenoid valve automatically drains and releases the pressure; Step 6: For the oil-filled equipment to be inspected, first open or close other related valves, then open the second pressure-limiting valve, inflate the equipment to be inspected through the airbag, and then gradually open the second pressure-limiting valve to the set limit; if the equipment to be inspected leaks and cannot be pressurized to the preset value, close the related valves to stop inflation, and manually exhaust and release the pressure through the second ball valve; if the value of the first pressure gauge drops significantly during the pressure holding period after the equipment to be inspected is pressurized to the preset value, indicating that the equipment sealing test has failed, then manually exhaust and release the pressure through the second ball valve; if the air pressure of the equipment to be inspected gradually increases to the set value, the value of the first pressure gauge does not change during the pressure holding period, and after the pressure is maintained for the set time, the second solenoid valve automatically exhausts and releases the pressure.

[0017] The present invention provides a tank-type airbag pressurization leak detection device and a method of using the same, which have the following beneficial effects: 1. The device can be used for leak detection by pressurizing with gas, water, or oil, and can also be used for combined pressurization leak detection by filling with water or oil and then filling with gas. Since the device does not require an electric oil pump or water pump for pressurization, but uses airbags for pressurization leak detection, it can safely and efficiently complete the pressurization leak detection of related equipment such as generators and main transformer coolers, and can also meet the leak detection needs of equipment with a leak detection pressure not exceeding 1.5Mpa. In addition, it can be used to fill GIS, GIL and other equipment with N2 gas to a pressure of about 0.5Mpa through an external pipeline for leak detection and to find the leak point; 2. The device can avoid equipment damage and personal injury through the pressure-limiting valve and the safety valve. Since harmless gas or water is used for pressurized leak detection, the solenoid valve starts to automatically release pressure after the pressure holding time reaches the standard requirement, thereby realizing safe pressurized leak detection of the equipment. If oil pressurized leak detection is used, the equipment pressure relief can only be completed by airbag pressure relief, and the equipment pressure relief cannot be completed by draining oil. However, after the pressure holding time is completed, the relevant protection will light up to warn. This can ensure the safety and convenience of pressurized leak detection. The pressurized leak detection device is easy to operate, safe, and efficient, and can be used for pressurized leak detection of different equipment. The leak detection device and leak detection method are novel, innovative, and practical; 3. This device can simultaneously pressurize and detect leaks on water-filled and oil-filled equipment. If the airbag pressure is insufficient, the airbag can be replenished at any time through the first pressure-limiting valve. When the tank is not equipped with an airbag, the equipment can be pressurized and leak-checked by inflating the tank or an external air pipe, or by directly pressurizing and leak-checking the equipment through an external water pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0019] like Figure 1 As shown, a tank-type airbag pressurized leak detection device comprises a sealed tank body 1, an airbag 2 is arranged in the tank body 1, a liquid inlet and a liquid discharge port are arranged on the tank body 1, the liquid inlet is connected to the liquid inlet pipe 3, and the liquid discharge port is connected to the first device to be leak detected 4; an air inlet and an air discharge port are arranged on the airbag 2, the air inlet is connected to the air inlet pipe 5, and the air discharge port is connected to the second device to be leak detected 6, the first device to be leak detected 4 performs water pressure leak detection, and the second device to be leak detected performs air pressure leak detection; the liquid inlet pipe 3 and the air inlet pipe 5 are respectively connected to a water source and an air source, and the air source is a pressurized air source.

[0020] Preferably, the liquid inlet pipe 3 is provided with a first electromagnetic valve 7, the liquid outlet is connected to the third ball valve 8, and then connected to the first leak detection device 4 through a connecting water pipe 9; a third pressure limiting valve 10 and a second pressure gauge 11 are provided on the connecting water pipe 9. When the first electromagnetic valve 7 is opened, the water source injects water into the tank body, and when the first electromagnetic valve 7 is closed, the water source stops injecting water into the tank body, the third ball valve 8 is used to discharge water from the tank body, the third pressure limiting valve 10 is used to control the water pressure so that the pressure of the device to be detected does not exceed the corresponding set value, and the second pressure gauge 11 is used to monitor the actual water pressure of the device to be detected.

[0021] Preferably, the connecting water pipe 9 is also connected to the third safety valve 12, the fourth ball valve 13 and the third solenoid valve 14. The third safety valve 12 is used to prevent the equipment to be inspected from being damaged by overpressure. When the pressure value of the equipment to be inspected exceeds the corresponding set pressure, the third safety valve 12 is activated to drain and release pressure. The fourth ball valve 13 is used for manual drainage and pressure relief of the equipment to be inspected. The third solenoid valve 14 is used for automatic drainage and pressure relief of the equipment to be inspected. When the pressure resistance time of the equipment to be inspected reaches the set value, the relevant contacts of the time switch are closed, and the solenoid valve 14 automatically drains and releases pressure.

[0022] Preferably, an equipment water injection pipe 15 is connected between the input end of the first solenoid valve 7 and the output end of the third ball valve 8, and a fifth ball valve 16 is provided on the equipment water injection pipe 15. The spare water injection pipe 15 is used to bypass the tank body and directly inject water into the equipment to be inspected, and the fifth ball valve 16 is used to close or open the spare water injection pipe 15.

[0023] Preferably, both ends of the connecting water pipe 9 are connected to the third ball valve 8 and the first leak detection device 4 via flange interfaces.

[0024] Preferably, the tank body 1 is arranged on an electronic scale 17. The electronic scale 17 has two sets of normally open contacts for automatic water replenishment of the tank body, which can be closed by setting a weight value. When the water in the tank body is less than the set value, the contact 1 is closed, the corresponding first electromagnetic valve 7 is opened, and the tank body is automatically replenished with water. When the water in the tank body exceeds the set value, the contact 1 is disconnected, the corresponding first electromagnetic valve 7 is closed, and the tank body stops replenishing water.

[0025] Preferably, the air inlet pipe 5 is provided with a first pressure limiting valve 18, and the exhaust port is connected to the second leak detection device 6 through a connecting air pipe 19; a second pressure limiting valve 20 and a first pressure gauge 21 are provided on the connecting air pipe 19. The first pressure limiting valve 18 is used to limit the airbag inflation pressure to exceed a set value, the second pressure limiting valve 20 is used to limit the air pressure of the device to be detected to exceed a set value, and the first pressure gauge 21 is used to monitor the actual air pressure of the device to be detected.

[0026] Preferably, the connecting air pipe 19 is also connected to the second safety valve 22, the second ball valve 23 and the second solenoid valve 24. The second safety valve 22 is used to prevent the equipment to be inspected from being damaged by overpressure. When the air pressure of the equipment to be inspected exceeds the set value, the safety valve 22 automatically starts to exhaust and release pressure. The second ball valve 23 is used for manual exhaust and pressure relief of the equipment to be inspected. The second solenoid valve 24 is used for automatic exhaust and pressure relief of the equipment to be inspected. When the pressure resistance time of the equipment to be inspected reaches the set value, the relevant time-setting switch contacts are closed, and the solenoid valve 14 automatically exhausts and releases pressure.

[0027] Preferably, both ends of the connecting air pipe 19 are connected to the exhaust port and the second leak detection device 6 through self-sealing interfaces.

[0028] Preferably, the airbag 2 is also connected to a protective air pipe 25, and the protective air pipe 25 is connected to a first ball valve 26 and a first safety valve 27. The protective air pipe 25 is used to connect the relevant valves with the internal airbag 2, the first ball valve 26 is used for manual exhaust and pressure relief of the airbag, and the first safety valve 27 is used to prevent the airbag and the tank from being damaged by overpressure. When the air pressure of the airbag exceeds the pressure value that the airbag or the tank can withstand, the safety valve 27 automatically starts exhaust and pressure relief.

[0029] The specific steps for use are as follows: Step 1: Press Figure 1 Connect the corresponding pressurizing device.

[0030] Step 2: Fill the tank to half full with water.

[0031] Step 3: If the equipment to be inspected needs water replenishment, replenish it through the spare water pipe.

[0032] Step 4: Inflate the airbag and build up a corresponding pressure, the pressure value of which is lower than the pressure resistance of the airbag and the tank.

[0033] Step 5: For the water-filled equipment to be inspected, first open or close other related valves, then open the third ball valve 8, and fill the equipment to be inspected with water through the tank body 1, and then gradually open the third pressure-limiting valve 10 to the set limit position; if the equipment to be inspected leaks and cannot be pressurized to the preset value, close the related valves to stop filling with water, and manually drain and release the pressure through the fourth ball valve 13; if the equipment to be inspected is pressurized to the preset value, the value of the second pressure gauge 11 drops significantly during the pressure holding period, indicating that the equipment sealing test is unqualified, and the fourth ball valve 13 is manually drained and the pressure is released; if the water pressure of the equipment to be inspected gradually increases to the set value, the value of the second pressure gauge 11 does not change during the pressure holding period, and after the pressure is maintained for the set time, the third solenoid valve 14 automatically drains and releases the pressure.

[0034] Step six: For the oil-filled equipment to be inspected, first open or close other related valves, then open the second pressure-limiting valve 20, inflate the equipment to be inspected through the airbag 2, and then gradually open the second pressure-limiting valve 20 to the set limit position; if the equipment to be inspected leaks and cannot be pressurized to the preset value, close the related valves to stop inflation, and manually exhaust and release the pressure through the second ball valve 23; if after the equipment to be inspected is pressurized to the preset value, the value of the first pressure gauge 21 drops significantly during the pressure holding period, indicating that the equipment sealing test is unqualified, and the pressure is manually released through the second ball valve 23; if the air pressure of the equipment to be inspected gradually increases to the set value, the value of the first pressure gauge 21 does not change during the pressure holding period, and after the pressure is maintained for the set time, the second solenoid valve 24 automatically exhausts and releases the pressure.

[0035] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A tank-type airbag pressurized leak detection device, characterized in that: The invention comprises a sealed tank body (1), an air bag (2) is arranged in the tank body (1), a liquid inlet and a liquid discharge port are arranged on the tank body (1), the liquid inlet is connected to a liquid inlet pipe (3), and the liquid discharge port is connected to a first leak detection device (4); an air inlet and an air discharge port are arranged on the air bag (2), the air inlet is connected to an air inlet pipe (5), and the air discharge port is connected to a second leak detection device (6); the first leak detection device (4) performs water pressure leak detection, and the second leak detection device performs air pressure leak detection; the liquid inlet pipe (3) and the air inlet pipe (5) are respectively connected to a water source and an air source, and the air source is a pressurized air source.

2. A tank-type airbag pressurized leak detection device according to claim 1, characterized in that: The liquid inlet pipe (3) is provided with a first solenoid valve (7), the liquid outlet is connected to a third ball valve (8), and then connected to the first leak detection device (4) via a connecting water pipe (9); a third pressure limiting valve (10) and a second pressure gauge (11) are provided on the connecting water pipe (9).

3. A tank-type airbag pressurized leak detection device according to claim 2, characterized in that: The connecting water pipe (9) is also connected to the third safety valve (12), the fourth ball valve (13) and the third solenoid valve (14).

4. A tank-type airbag pressurized leak detection device and method according to claim 3, characterized in that: An equipment water injection pipe (15) is connected between the input end of the first solenoid valve (7) and the output end of the third ball valve (8), and a fifth ball valve (16) is provided on the equipment water injection pipe (15).

5. A tank-type airbag pressurized leak detection device according to claim 4, characterized in that: The two ends of the connecting water pipe (9) are connected to the third ball valve (8) and the first leak detection device (4) via flange interfaces; the tank body (1) is arranged on an electronic scale (17).

6. A tank-type airbag pressurized leak detection device according to claim 5, characterized in that: The air inlet pipe (5) is provided with a first pressure limiting valve (18), and the air outlet is connected to the second leak detection device (6) via a connecting air pipe (19); the connecting air pipe (19) is provided with a second pressure limiting valve (20) and a first pressure gauge (21).

7. A tank-type airbag pressurized leak detection device and method according to claim 6, characterized in that: The connecting air pipe (19) is also connected to the second safety valve (22), the second ball valve (23) and the second solenoid valve (24).

8. A tank-type airbag pressurized leak detection device according to claim 7, characterized in that: Both ends of the connecting air pipe (19) are connected to the exhaust port and the second leak detection device (6) via self-sealing interfaces.

9. A tank-type airbag pressurized leak detection device according to claim 8, characterized in that: The air bag (2) is also connected to a protective air pipe (25), and the protective air pipe (25) is connected to a first ball valve (26) and a first safety valve (27).

10. The method for using the tank-type airbag pressurized leak detection device as claimed in claim 9, characterized in that: The following steps are involved: Step 1: Connect the device; Step 2: Fill the tank (1) with water until it is half full; Step 3: If the equipment to be inspected needs water replenishment, replenish water through the spare water pipe; Step 4: Inflate the airbag (2) and build up a corresponding pressure, the pressure value being lower than the pressure resistance value of the airbag and the tank. Step 5: For the equipment to be inspected that is filled with water, first open or close other related valves, then open the third ball valve (8) and fill the equipment to be inspected with water through the tank body (1), and then gradually open the third pressure-limiting valve (10) to the set limit position; if the equipment to be inspected leaks and cannot be pressurized to the preset value, close the related valves to stop filling with water, and manually drain the water through the fourth ball valve (13); if the value of the second pressure gauge 11 drops significantly during the pressure-maintaining period after the equipment to be inspected is pressurized to the preset value, indicating that the equipment sealing test is unqualified, then manually drain the water through the fourth ball valve (13); if the water pressure of the equipment to be inspected gradually increases to the set value, the value of the second pressure gauge (11) does not change during the pressure-maintaining period, and after the pressure is maintained for the set time, the third solenoid valve (14) automatically drains the water and releases the pressure; Step 6: For the oil-filled equipment to be inspected, first open or close other related valves, then open the second pressure-limiting valve (20), inflate the equipment to be inspected through the airbag (2), and then gradually open the second pressure-limiting valve (20) to the set limit position; if the equipment to be inspected is leaking and cannot be pressurized to the preset value, close the related valves to stop inflation, and manually exhaust and release the pressure through the second ball valve (23); if the value of the first pressure gauge (21) drops significantly during the pressure holding period after the equipment to be inspected is pressurized to the preset value, indicating that the equipment sealing test is unqualified, then manually exhaust and release the pressure through the second ball valve (23); if the air pressure of the equipment to be inspected gradually increases to the set value, the value of the first pressure gauge (21) does not change during the pressure holding period, and after the pressure is maintained for the set time, the second solenoid valve (23) automatically exhausts and releases the pressure.

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