A kind of extra-high voltage testing device and method for air cooler pressure test

Abstract

The application provides a super-high pressure testing device and method for pressure test of an air cooler, a pressure test medium supply system is connected to a test piece, the test piece comprises a pipe body with closed two ends, the pipe body is fixed on a seat body, a plurality of U-shaped pipe fittings are arranged on the pipe body, the U-shaped pipe fittings are perpendicular to the pipe body, the inner cavities of the U-shaped pipe fittings and the inner cavity of the pipe body are communicated and jointly form a channel for containing the pressure test medium; when the pressure in the test piece is increased to 30 MPa during testing, whether the test piece has a leakage point is detected; the pressure is increased by 10% of a target pressure each time, the pressure is maintained for 1 hour after each time of pressure increase, and whether the test piece has a leakage point is detected. According to the scheme, the super-high pressure testing device and / or the air cooler to be detected are submerged in water in a water tank, the danger in the use process of the super-high pressure testing device is greatly reduced without affecting the observation of the pressure test state.

Description

Technical Field

[0001] This invention belongs to the field of air cooler pressure testing technology, specifically relating to an ultra-high voltage testing device for air cooler pressure testing, as well as an ultra-high voltage testing method and an air cooler pressure testing method using the device, wherein the ultra-high voltage refers to a pressure of not less than 60 MPa. Background Technology

[0002] Air coolers undergo pressure testing before leaving the factory to ensure their quality meets requirements. Currently, according to standard requirements for conventional air coolers, their design pressure does not exceed 35 MPa. With the development of air-cooling technology, some specific applications require the use of ultra-high pressure air coolers, with design pressures exceeding 80 MPa. Since these ultra-high pressure air coolers are new products, there are currently no corresponding testing standards; the best approach remains pressure testing. However, existing pressure testing equipment cannot achieve test pressures exceeding 80 MPa. Therefore, redesigned pressure testing equipment requires the assistance of ultra-high pressure testing devices to verify its ability to withstand such extreme pressure.

[0003] More importantly, when conducting ultra-high pressure tests on air coolers, it is difficult to assess the potential leaks beforehand, which poses a significant risk. Sufficient safety measures must be in place to ensure safety, and existing methods cannot effectively guarantee the safety of the pressure test. Summary of the Invention

[0004] In view of the technical problems mentioned in the background art, the purpose of this invention is to provide an ultra-high voltage testing device for air cooler pressure testing, and an ultra-high voltage testing method using the device.

[0005] The technical solution adopted in this invention is as follows.

[0006] An ultra-high voltage testing device for air cooler pressure testing includes a test medium supply system. The test medium supply system is connected to a test specimen. The test specimen includes a tube body closed at both ends. The tube body is fixed on a base. Multiple U-shaped fittings are provided on the tube body. The U-shaped fittings are perpendicular to the tube body. The inner cavities of the U-shaped fittings and the inner cavities of the tube body are connected and together form a channel for containing the test medium.

[0007] To improve the safety of the ultra-high voltage testing device, it also includes a top-open water tank. The two ends of the pipe are welded to the two inner walls of the water tank, and the lower end of the medium inlet short pipe set on the pipe is welded to the bottom wall of the water tank. The test pressure medium joint on the side wall of the medium inlet short pipe is connected to the pipeline of the test pressure medium supply system.

[0008] Furthermore, the tube body is fixed to the support platform by several tube clamps, and the length of the tube body is not less than the length of the air cooler distribution tube.

[0009] To facilitate observation of whether there are leaks in the test specimen, the pipe body is arranged horizontally, and the U-shaped pipe fitting is arranged vertically.

[0010] In this invention, the test pressure medium supply system includes a high-pressure pump, which is connected to the test pressure medium inlet pipe and the pipeline. The pipeline is fixed to the support platform by multiple pipe clamps, and branch pipes are connected to the pipeline. Both the branch pipes and the pipeline are equipped with high-pressure shut-off valves.

[0011] A testing method using the aforementioned ultra-high voltage testing device includes the following steps:

[0012] Step 1: Install the test specimen, open the high-pressure shut-off valve one on the pipeline, close the high-pressure shut-off valve two on the branch pipe, turn on the test pressure medium supply system, inject the test pressure medium into the test specimen and pressurize it.

[0013] Step 2: When the pressure of the test medium inside the test specimen rises to 30MPa, check whether there are any leaks in the test specimen. If there are no leaks, proceed to Step 3.

[0014] Step 3: Increase the pressure by 10% of the target pressure each time, and hold the pressure for 1 hour after each increase and check for leaks;

[0015] Step 4: When the specimen meets the condition of no leakage during the pressure holding process under the target pressure, first close the high pressure shut-off valve one on the pipeline, and then open the high pressure shut-off valve two on the branch pipe.

[0016] The test method also includes the following steps: Step 01, after the test piece is installed and before the high pressure shut-off valve is opened, fill the water tank with test pressure clean water until the water level of the test pressure clean water is 80-150mm higher than the top of the U-shaped pipe fitting.

[0017] To further enhance safety during testing, leaks are detected by observing air bubbles and / or jets in the water tank. The presence of air bubbles and / or jets, coupled with unstable pressure on the gauge, indicates a leak; otherwise, no leak is detected. If gas is used as the test medium, a cover with an observation hole is installed on the water tank to further improve safety. A camera connected to an external display terminal is installed at the observation hole, and air bubbles in the water are observed through the display to determine if a leak is present.

[0018] In this invention, the target pressure is 80-100 MPa.

[0019] A pressure testing method using the aforementioned ultra-high voltage testing device is disclosed. The ultra-high voltage testing device is used as the pressure testing equipment for the air cooler under test. The air cooler under test is placed in a water tank and connected to the end of a branch pipe or directly connected to the pipeline. This approach improves the efficiency of air cooler pressure testing while ensuring safety during the testing process.

[0020] Beneficial effects: This invention provides a stable and safe testing device for UHV air cooler pressure testing. It can be used not only as a testing device for UHV pressure testing systems but also directly as a UHV pressure testing device. The solution of this invention, by submerging the UHV testing device and / or the air cooler under test with test water in a water tank, significantly reduces the danger during the use of the UHV testing device without affecting the observation of the test pressure status. Simultaneously, it enables the recycling of test water, saving a significant amount of water resources. Using the UHV testing device of this invention as a pressure testing device facilitates rapid replacement of the air cooler under test and rapid pressure increase and decrease when testing multiple air coolers. Attached Figure Description

[0021] Figure 1 This is a partial schematic diagram of the ultra-high voltage testing device used for air cooler pressure testing in Example 1.

[0022] Figure 2 This is a schematic diagram of the installation status of the ultra-high voltage test device used for air cooler pressure testing in Example 2;

[0023] Figure 3 This is a schematic diagram of the ultra-high voltage testing device used for air cooler pressure testing in Example 3. Detailed Implementation

[0024] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0025] Example 1

[0026] like Figure 1As shown, an ultra-high voltage testing device for air cooler pressure testing includes a test medium supply system connected to a test specimen. The test specimen includes a pipe 11 closed at both ends, fixed to a base 10. Multiple U-shaped fittings 12 are arranged on the pipe 11, perpendicular to the pipe 11, and their inner cavities communicate with the inner cavities of the pipe 11, forming a channel for containing the test medium. The device also includes a top-opening water tank 13. The two ends of the pipe 11 are welded to the two inner walls of the water tank 13. A medium inlet short pipe 14 on the pipe 11 is welded to the bottom wall of the water tank 13 at its lower end. A test medium connector 15 on the side wall of the medium inlet short pipe 14 connects to a pipeline 16 of the test medium supply system. The pipe 11 is arranged horizontally, and the U-shaped fittings 12 are arranged vertically. The pressure testing medium supply system includes a high-pressure pump 20, which is connected to a pressure testing medium inlet pipe 23 and a pipeline 16. The pipeline 16 is fixed to the support platform 10 by multiple pipe clamps 27. The pipeline 16 is equipped with a safety valve 25 and a tee 26, through which a branch pipe 21 is connected. Both the branch pipe 21 and the pipeline 16 are equipped with high-pressure shut-off valves. A first high-pressure shut-off valve 22 is installed on the pipeline 16, and a second high-pressure shut-off valve 24 is installed on the branch pipe 21. In this embodiment, the water tank 13 is installed on the support platform 10, and the pipeline 16 extends laterally from outside the water tank 13 into the water tank 13. The connection between the pipeline 16 and the water tank 13 is a sealed connection.

[0027] Example 2

[0028] See Figure 2As shown, an ultra-high voltage testing device for air cooler pressure testing includes a test medium supply system connected to a test specimen. The test specimen includes a pipe body 11 closed at both ends. Multiple U-shaped fittings are installed on the pipe body 11, perpendicular to the pipe body 11. The inner cavities of the U-shaped fittings and the inner cavities of the pipe body 11 communicate with each other, forming a channel for containing the test medium. The device also includes a top-opening water tank 13. The two ends of the pipe body 11 are welded to the two inner walls of the water tank 13. A medium inlet short pipe installed on the pipe body 11 is welded to the bottom wall of the water tank 13 at its lower end. The test medium connector on the side wall of the medium inlet short pipe is connected to the pipeline 16 of the test medium supply system. The pipe body 11 is arranged horizontally, and the U-shaped fittings are arranged vertically. The pressure testing medium supply system includes a high-pressure pump, which is connected to the pressure testing medium inlet pipe and pipeline 16. Pipeline 16 is fixed to the support platform by multiple pipe clamps. Pipeline 16 is equipped with a safety valve and a tee 26. A branch pipe 21 is connected to pipeline 16 via the tee 26. Both the branch pipe 21 and pipeline 16 are equipped with high-pressure shut-off valves. High-pressure shut-off valve one is installed on pipeline 16, and high-pressure shut-off valve two is installed on branch pipe 21. In this embodiment, one end of the water tank 13 has an inclined wall 29. Pipeline 16 is introduced into the water tank 13 along the inclined wall 29. The inclined wall 29 serves to facilitate the replenishment of pressure testing water into the water tank 13 without affecting its use. Pouring pressure testing water from the inclined wall 29 will not cause significant fluctuations in the pressure testing water level in the water tank 13.

[0029] Example 3

[0030] See Figure 3As shown, a pressure testing method using the UHV testing device in Embodiment 2 is described. The UHV testing device is used as the pressure testing equipment for the air cooler 28 under test. The air cooler 28 is placed inside the water tank 13, located on the right side of the pipe body 11, and connected to the end of a branch pipe 21. Two sets of branch pipes 21 are provided, one set serving as a vent / drain pipe, and the other set connected to the air cooler 28 under test. In practical applications, one set of branch pipes 21 can be connected to the medium inlet end of the air cooler 28 under test, thereby introducing the test water from the UHV testing device into the air cooler 28. In this case, the UHV testing device simultaneously serves as a transfer point for test water and acts as a buffer, further improving safety during the pressure testing process. After the pressure test of an air cooler is completed, the high-pressure shut-off valve on one set of branch pipes 21 is first opened to release the pressure inside the air cooler. Then, the opened high-pressure shut-off valve is closed, and the air cooler is dismantled and lifted out of the water tank 13. The next air cooler to be tested is then installed into the water tank 13. During the switching process of pressure testing multiple air coolers, test water can be continuously maintained in the UHV testing device. After a new air cooler is connected for pressure testing, the pressure can be rapidly increased. Since opening the high-pressure shut-off valve on one of the branch pipes 21 allows the test water in the air cooler to be directly discharged into the water tank 13, the pressure can be rapidly reduced. The water in the water tank 13 directly buffers the discharged test water, which can significantly reduce the risk factor during the pressure reduction process.

[0031] Example 4

[0032] A testing method using the ultra-high voltage testing device in Example 1 includes the following steps:

[0033] Step 1: Install the test specimen (when installing the pipe body 11, ensure that both ends of the pipe body 11 are welded to the two inner walls of the water tank 13 respectively), fill the water tank 13 with test pressure clean water until the water level of the test pressure clean water is 100mm higher than the top of the U-shaped pipe fitting 12, then open the high pressure shut-off valve 22 on the pipe 16, close the high pressure shut-off valve 24 on the branch pipe 21, turn on the test pressure medium supply system, inject the test pressure medium into the test specimen and pressurize it;

[0034] Step 2: When the water pressure inside the test specimen rises to 30MPa (first pressurization), check the test specimen for leaks. If there are no leaks, proceed to Step 3. Determine if there are leaks by observing the bubbles and / or jets in the water in the water tank 13. If there are bubbles and / or jets and the pressure displayed on the pressure gauge is unstable, it indicates that there are leaks; otherwise, there are no leaks.

[0035] Step 3: Each time, increase the pressure by 10% of the target pressure (80 MPa), hold the pressure for 1 hour after each increase, and check for leaks; specifically, after increasing the pressure to 38 MPa for the second time, hold the pressure for 1 hour after increasing the pressure to 46 MPa for the third time, hold the pressure for 1 hour after increasing the pressure to 54 MPa for the fourth time, hold the pressure for 1 hour after increasing the pressure to 62 MPa for the fifth time, hold the pressure for 1 hour after increasing the pressure to 70 MPa for the sixth time, hold the pressure for 1 hour after increasing the pressure to 78 MPa for the seventh time, and hold the pressure for 1 hour after increasing the pressure to 86 MPa for the eighth time.

[0036] Step 4: When the test piece meets the condition of no leakage during the pressure holding process under the target pressure, first close the high pressure shut-off valve 22 on the pipeline 16, and then open the high pressure shut-off valve 24 on the branch pipe 21.

[0037] Example 5

[0038] A testing method using the ultra-high voltage testing device in Example 2 includes the following steps:

[0039] Step 1: Install the test specimen (when installing the pipe body 11, weld the two ends of the pipe body 11 to the two inner walls of the water tank 13 respectively, and introduce the pipe 16 into the water tank 13 along the inclined wall 29). Fill the water tank 13 with test pressure clean water until the water level of the test pressure clean water is 150mm higher than the top of the U-shaped pipe fitting 12. Then open the high pressure shut-off valve 22 on the pipe 16, close the high pressure shut-off valve 24 on the branch pipe 21, turn on the test pressure medium supply system, inject the test pressure medium into the test specimen and pressurize it.

[0040] Step 2: When the water pressure inside the test specimen rises to 30MPa (first pressurization), check the test specimen for leaks. If there are no leaks, proceed to Step 3. Determine if there are leaks by observing the bubbles and / or jets in the water in the water tank 13. If there are bubbles and / or jets and the pressure displayed on the pressure gauge is unstable, it indicates that there are leaks; otherwise, there are no leaks.

[0041] Step 3: Each time, increase the pressure by 10% of the target pressure (100 MPa), hold the pressure for 1 hour after each increase, and check for leaks; specifically, after increasing the pressure to 40 MPa for the second time, hold the pressure for 1 hour after increasing the pressure to 50 MPa for the third time, hold the pressure for 1 hour after increasing the pressure to 60 MPa for the fourth time, hold the pressure for 1 hour after increasing the pressure to 70 MPa for the fifth time, hold the pressure for 1 hour after increasing the pressure to 80 MPa for the sixth time, hold the pressure for 1 hour after increasing the pressure to 90 MPa for the seventh time, and hold the pressure for 1 hour after increasing the pressure to 100 MPa for the eighth time.

[0042] Step 4: When the test piece meets the condition of no leakage during the pressure holding process under the target pressure, first close the high pressure shut-off valve 22 on the pipeline 16, and then open the high pressure shut-off valve 24 on the branch pipe 21.

[0043] Example 6

[0044] A testing method using the ultra-high voltage testing device in Example 1 includes the following steps:

[0045] Step 1: Install the test specimen (when installing the pipe body 11, ensure that both ends of the pipe body 11 are welded to the two inner walls of the water tank 13 respectively), fill the water tank 13 with clean water until the water level is 100mm higher than the top of the U-shaped pipe fitting 12, then open the high-pressure shut-off valve 22 on the pipe 16, close the high-pressure shut-off valve 24 on the branch pipe 21, turn on the test pressure medium supply system, inject the test pressure medium into the test specimen and pressurize it; then quickly cover the water tank 13 with the cover plate (an observation hole is opened on the cover plate, a camera is installed at the observation hole, and the camera is connected to an external display terminal); in this embodiment, the test pressure medium is clean air;

[0046] Step 2: When the air pressure inside the test piece rises to 30MPa (first pressurization), check the test piece for leaks. If there are no leaks, proceed to Step 3. Determine if there are leaks by observing the air bubbles in the water in the water tank 13. If there are air bubbles and the pressure displayed on the pressure gauge is unstable, it indicates that there are leaks; otherwise, there are no leaks.

[0047] Step 3: Each time, increase the pressure by 10% of the target pressure (80 MPa), hold the pressure for 1 hour after each increase, and check for leaks; specifically, after increasing the pressure to 38 MPa for the second time, hold the pressure for 1 hour after increasing the pressure to 46 MPa for the third time, hold the pressure for 1 hour after increasing the pressure to 54 MPa for the fourth time, hold the pressure for 1 hour after increasing the pressure to 62 MPa for the fifth time, hold the pressure for 1 hour after increasing the pressure to 70 MPa for the sixth time, hold the pressure for 1 hour after increasing the pressure to 78 MPa for the seventh time, and hold the pressure for 1 hour after increasing the pressure to 86 MPa for the eighth time.

[0048] Step 4: When the test piece meets the condition of no leakage during the pressure holding process under the target pressure, first close the high pressure shut-off valve 22 on the pipeline 16, and then open the high pressure shut-off valve 24 on the branch pipe 21.

[0049] When water is used as the pressure testing medium, if no air bubbles or jets are observed in the water in tank 13 but the pressure displayed on the pressure gauge is unstable, it may be a slight leak. In this case, the pressure testing medium should be replaced with air to further detect any leaks.

[0050] This invention provides a stable and safe testing device for pressure testing of ultra-high voltage (UHV) air coolers. It can be used not only as a testing device for UHV pressure testing systems but also directly as a UHV pressure testing device. The solution of this invention utilizes test water in a water tank to submerge the UHV testing device and / or the air cooler under test, significantly reducing the danger during the use of the UHV testing device without affecting the observation of the pressure test status. Simultaneously, it enables the recycling of test water, saving a significant amount of water resources. Using the UHV testing device of this invention as a pressure testing device facilitates rapid replacement of the air cooler under test and rapid pressure increase and decrease when testing multiple air coolers.

Claims

1. A kind of extra-high voltage testing device for air cooler pressure test, comprising pressure test medium supply system, it is characterized by: The test pressure medium supply system is connected with the test piece, which comprises a pipe body (11) with two closed ends, the pipe body (11) is fixed on a seat body (10), a plurality of U-shaped pipe fittings (12) are arranged on the pipe body (11), the U-shaped pipe fittings (12) are perpendicular to the pipe body (11), the inner cavities of the U-shaped pipe fittings (12) and the inner cavity of the pipe body (11) are communicated and jointly form a channel for containing the test pressure medium; the test piece further comprises a water tank (13) with an open top, the two ends of the pipe body (11) are welded and connected to the two inner side walls of the water tank (13) respectively, the lower end of a medium inlet short pipe (14) arranged on the pipe body (11) is welded and connected to the bottom wall of the water tank (13), and a test pressure medium connector (15) on the side wall of the medium inlet short pipe (14) is connected with a pipeline (16) of the test pressure medium supply system; the pipe body (11) is horizontally arranged, and the U-shaped pipe fittings (12) are vertically arranged.

2. The UHV testing device of claim 1, wherein: The pipe body (11) is fixed on the bearing table through a plurality of pipe clamps.

3. The UHV testing device of claim 2, wherein: The test pressure medium supply system comprises a high-pressure pump (20), the high-pressure pump (20) is connected with a medium introduction pipe (23) and the pipeline (16), the pipeline (16) is fixed on the bearing table through a plurality of pipe clamps, a branch pipe (21) is connected with the pipeline (16), and high-pressure stop valves are arranged on the branch pipe (21) and the pipeline (16).

4. A test method using the ultra-high voltage test device according to any one of claims 1 to 3, characterized by the steps of It comprises: Step 1, after the test piece is installed, the high-pressure stop valve one (22) on the pipeline (16) is opened, the high-pressure stop valve two (24) on the branch pipe (21) is closed, the test pressure medium supply system is started, the test pressure medium is injected into the test piece, and the pressure is increased; Step 2, when the pressure of the test pressure medium in the test piece reaches 30 MPa, whether the test piece has a leakage point is detected, if not, step 3 is implemented; Step 3, the pressure is increased by 10% of the target pressure each time, the pressure is kept for 1 hour after each pressure increase, and whether there is a leakage point is detected; Step 4, when the test piece meets the condition that there is no leakage point in the pressure keeping process under the target pressure, the high-pressure stop valve one (22) on the pipeline (16) is closed first, and then the high-pressure stop valve two (24) on the branch pipe (21) is opened.

5. The test method of claim 4, wherein, It further comprises the following steps: Step 01, after the test piece is installed and before the high-pressure stop valve is opened, test pressure water is filled into the water tank (13) until the water surface of the test pressure water is 80-150 mm higher than the top point of the U-shaped pipe fitting (12).

6. The test method of claim 5, wherein: Whether there is a leakage point is determined by observing the bubbles in the water in the water tank (13), if there are bubbles and the pressure shown in the pressure gauge is unstable, it indicates that there is a leakage point, otherwise, there is no leakage point.

7. The test method of claim 6, wherein: The target pressure is 80-100 MPa.

8. A pressure testing method using the extra-high voltage testing device according to any one of claims 1 to 3, characterized by: The ultrahigh pressure test device is used as a test pressure equipment of the detected air cooler, the detected air cooler is placed in the water tank (13) and connected with the end of the branch pipe (21) or directly connected with the pipeline (16).

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