Leakage detection device

Abstract

The utility model relates to the technical field of leakage detection, and provides a leakage detection device, which comprises a tool box internally provided with a gas circuit integrated block; the air path integrated block is provided with a compressed air circulation channel, an air inlet pipeline and a plurality of air outlet pipelines which are communicated with the compressed air circulation channel are arranged on the air path integrated block, the air inlet pipeline is used for being communicated with a compressed air source, and the air outlet pipelines are used for being correspondingly connected with a plurality of pipelines to be tested; the digital pressure gauges are mounted on the air inlet pipeline and the air outlet pipeline; the computer is connected with the digital pressure gauges and determines whether leakage occurs or not according to the air pressure drop condition of the to-be-detected pipeline. The compressed air pipeline is integrated on the air path manifold block, a plurality of air outlet pipelines can be arranged for detecting leakage, and the air outlet pipelines are arranged in the tool box, so that the pipelines can be protected and are prevented from being damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of leakage detection, and more specifically, relates to a leakage detection device. Background Art

[0002] Various equipment in industrial production often need to be cooled, and water cooling is a very widely used method. Equipment in industries including semiconductors needs to be water cooled. The circulating cooling water system includes cooling water pipelines and heat exchange pipelines. Water is used as the cooling medium. The cooling water supplied by the cooling water pipeline is recycled again after being exchanged and cooled in the heat exchange pipeline. Among them, if the process cooling water (PCW, Process cooling water) pipeline and the heat exchange pipeline (Heat Exchange Manifold) leak, it will not only affect the cooling effect, but also may cause hidden dangers of failure of other equipment. Therefore, the cooling water pipeline and the heat exchange pipeline should be regularly tested for leaks.

[0003] Compressed dry air (CDA) can be passed into the process cooling water pipeline and heat exchange pipeline to detect the pressure change of CDA in the pipeline, so as to determine whether there is a leak. At present, it is usually only used, such as tee and straight pipe connection, and a pointer pressure gauge is installed on the pipeline to form a detection tool. Figure 1 In the embodiment, a tee 10 and several straight pipes 12 are used, wherein the left side is a CDA inflow pipe, and two pipes are branched out on the right side as CDA outflow pipes, and pointer pressure gauges (Ananlog gauge) 11 are installed on the CDA outflow pipes.

[0004] However, the detection tool uses a pointer pressure gauge, and the pressure can only be read by the naked eye, making it difficult to determine the exact value of the pressure drop. Moreover, the detection tool is formed by connecting pipe fittings such as tees and straight pipes. The connection process is cumbersome, and usually only two detection pipelines are formed, that is, only two pipelines can be detected for leakage at the same time, resulting in low detection efficiency. Moreover, since the detection tool is assembled and connected with pipe fittings such as tees and straight pipes, the connection parts are relatively weak and are easily damaged during storage, resulting in leakage in the detection tool itself, making it impossible to accurately detect leakage in the process cooling water pipeline and the heat exchange pipeline.

[0005] Therefore, there is an urgent need for a detection solution that can accurately determine the pressure drop and protect the pipeline from damage caused by bumps. Utility Model Content

[0006]

Technical issues

[0007] In order to solve the above problems, the purpose of the utility model is to protect the compressed air pipeline by integrating it into the gas pipeline integrated block and building it into the tool box. A digital pressure gauge is used to accurately collect pressure data and accurately determine whether the pipeline to be tested is leaking.

[0008]

Technical solution

[0009] In order to achieve the above-mentioned purpose, the utility model provides a leakage detection device, comprising:

[0010] Tool box with built-in gas circuit manifold;

[0011] An air circuit integrated block, having a compressed air circulation channel, having an air inlet pipeline and a plurality of air outlet pipelines connected to the compressed air circulation channel, wherein the air inlet pipeline is used to be connected to a compressed air source, and the plurality of air outlet pipelines are used to be connected to a plurality of pipelines to be tested;

[0012] Digital pressure gauge, installed on the air inlet and outlet pipes;

[0013] The computer is connected to each digital pressure gauge and determines whether there is a leak based on the drop in compressed air pressure in the pipeline to be tested.

[0014] By integrating the compressed air pipeline into the gas pipeline manifold, multiple air outlet pipelines can be used to detect leaks, and the built-in tool box can protect the pipeline and is easy to store. When there is no cooling water in the pipeline to be tested, dry compressed air is introduced into it, and a digital pressure gauge is used to accurately collect pressure data. The pressure drop can be used to accurately determine whether the pipeline to be tested is leaking.

[0015] Optionally, one end of the air inlet pipeline is connected to the compressed air circulation channel of the air circuit integrated block, and the other end extends out of the toolbox and is connected to the compressed air source; one end of the multiple air outlet pipelines is connected to the compressed air circulation channel of the air circuit integrated block, and the other end extends out of the toolbox and is correspondingly connected to multiple pipelines to be tested.

[0016] Optionally, the digital pressure gauge includes a first digital pressure gauge and a second digital pressure gauge, the first digital pressure gauge is connected to the tube body of the air inlet pipeline located inside the tool box, and the second digital pressure gauge is installed on the tube body of the air outlet pipeline located outside the tool box.

[0017] Optionally, an air inlet valve is installed on the tube body of the air inlet pipeline located outside the tool box, and an air outlet valve is installed on the tube body of the air outlet pipeline located outside the tool box.

[0018] Optionally, the air outlet pipeline is connected to the pipeline to be tested via a hose.

[0019] Optionally, the upper cover of the tool box is openable and closable.

[0020] Optionally, the pipes of the air inlet pipe inside and outside the tool box are detachably connected, and the pipes of the air outlet pipe inside and outside the tool box are detachably connected.

[0021] Optionally, a venting pipeline and a venting valve are also provided on the gas circuit integrated block.

[0022] Optionally, the computer is connected to the digital pressure gauge via a DeviceNet network.

[0023] Optionally, a filter screen is provided at the end where the air outlet pipeline is connected to the pipeline to be tested.

[0024] Optionally, a screw extending radially outward is fixed on the outer periphery of the filter screen, and the screw is screwed onto the inner wall of the air outlet pipe. The filter screen is rotated so that the axis of the filter screen is perpendicular or parallel to the axis of the air outlet pipe.

[0025]

Beneficial Effects

[0026] As described above, the present application can have multiple air outlet pipelines for leak detection by integrating the compressed air pipeline into the air circuit integrated block, and is built into the tool box to protect the pipelines and avoid damage.

[0027] The digital pressure gauge is used to accurately display the pressure data, which is highly reliable and its accuracy can reach 0.01. The computer collects the pressure data and can accurately determine whether the pipeline to be tested is leaking by the pressure drop.

[0028] By first monitoring whether the leakage detection device itself is leaking through the first digital pressure gauge, the accuracy of the detection of the pipeline to be tested can be ensured.

[0029] The air inlet pipeline, the air outlet pipeline and the air vent pipeline inside and outside the tool box are detachably connected, so that the tool box is light and compact, and the detection conditions can be quickly achieved by connecting with external pipelines.

[0030] After the test is completed, the pressure in the leak detection device is released through the venting line, so that the pipeline connections can be safely removed.

[0031] When exhaust is released through the venting pipeline, the filter screen blocks the scaling pieces that fall off in the pipeline to be tested from entering the leakage detection device, thereby preventing blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] By describing the embodiments thereof in conjunction with the following drawings, the above-mentioned features and technical advantages of the present utility model will become clearer and easier to understand.

[0033] Figure 1It is a schematic diagram of a leakage detection device in the prior art.

[0034] Figure 2 Schematic diagram of a leakage detection device according to an embodiment of the utility model.

[0035] Figure 3 It is a schematic diagram of a compressed air circulation channel according to an embodiment of the utility model.

[0036] Figure 4 It is a schematic diagram in which the axis of the filter is parallel to the axis of the air outlet pipe.

[0037] Figure 5 It is a schematic diagram in which the axis of the filter is perpendicular to the axis of the air outlet pipe.

[0038] [Brief Description of Reference Numerals]

[0039] 2: Leak detection device 10: Tee

[0040] 11: Pointer pressure gauge 12: Straight tube

[0041] 200: Tool box 300: Gas circuit integrated block

[0042] 310: Inlet pipe 320: Outlet pipe

[0043] 321: Filter 322: Screw

[0044] 330: Compressed air circulation channel 340: Air release pipeline

[0045] 350: vent valve 410: first digital pressure gauge

[0046] 420: Second digital pressure gauge 510: Intake valve

[0047] 520: Exhaust valve 600: Hose

[0048] 700: Computer 800: Power adapter DETAILED DESCRIPTION

[0049] The embodiments of the present invention will be described below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that the described embodiments may be modified in various ways or combinations thereof without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of protection of the claims. In addition, in this specification, the drawings are not drawn to scale and the same reference numerals represent the same parts.

[0050] The leak detection device of the present application is used to detect whether the pipeline to be tested is leaking. By integrating the compressed air pipeline into the gas circuit integrated block, multiple air outlet pipelines can be provided for leak detection, and the device is built into the tool box to protect the pipeline and is easy to store. When there is no cooling water in the pipeline to be tested, dry compressed air is introduced into it, and a digital pressure gauge is used to accurately collect pressure data, and the air pressure drop is used to determine whether the pipeline to be tested is leaking. For example, in a plasma enhanced chemical vapor deposition (PECVD) system, the cooling water is drained from the process cooling water pipeline and the heat exchange pipeline, and then dry compressed air is filled into the pipeline using a leak detection device to determine whether there is a leak, so that the leaking part can be repaired in time before production, so that the PECVD system can be produced under reliable cooling conditions.

[0051] like Figure 2 As shown, the leakage detection device 2 according to the embodiment of the utility model includes: a tool box 200, having a cavity for accommodating an air circuit integrated block 300; an air circuit integrated block 300, wherein the air circuit integrated block 300 has a compressed air circulation channel, and has an air inlet pipeline 310 and a plurality of air outlet pipelines 320 connected to the compressed air circulation channel, wherein the air inlet pipeline 310 is used to be connected to a compressed air source, and the plurality of air outlet pipelines 320 are used to be connected to the corresponding pipeline to be tested, and compressed air is introduced into the pipeline to be tested; a digital pressure gauge, installed on the air inlet pipeline 310 and the plurality of air outlet pipelines 320, and used to display the compressed air pressure; a computer 700, connected to each digital pressure gauge, and used to collect data of the digital pressure gauges, and determine whether there is a leak according to the air pressure drop.

[0052] The air circuit integrated block 300 includes a compressed air circulation channel 330 for connecting the air inlet pipeline 310 and the air outlet pipeline 320 ; the air inlet pipeline 310 is connected to the compressed air circulation channel 330 ; and a plurality of air outlet pipelines 320 are connected to the compressed air circulation channel 330 .

[0053] The gas circuit integrated block 300 may be a rectangular parallelepiped, and has a compressed air flow channel 330 therein. Figure 2 As shown, a cuboid with a cavity can be directly used, and the cavity is used as a compressed air flow channel. Figure 3As shown, a channel may be drilled in the length direction of the gas circuit integrated block 300 by, for example, a drilling machine, and multiple channels connected to the channel may be drilled on both sides of the gas circuit integrated block 300 in the width direction to form a compressed air circulation channel 330. In addition, the present embodiment does not limit the shape of the gas circuit integrated block 300, and it can be set as needed, as long as it has a cavity as a compressed air circulation channel, and an air inlet pipeline and multiple air outlet pipelines are arranged to communicate with the compressed air circulation channel. For example, the gas circuit integrated block 300 may also be cylindrical, with a cavity inside as a compressed air circulation channel, an air inlet pipeline arranged on its axis, and multiple air outlet pipelines arranged on its circumference.

[0054] One end of the air inlet pipeline 310 is connected to the compressed air circulation channel of the gas circuit integrated block 300, and the other end extends out of the tool box 200; the air inlet pipeline 310 is used to connect to the compressed air source to input the compressed air into the compressed air circulation channel. One end of the multiple air outlet pipelines 320 is connected to the compressed air circulation channel of the gas circuit integrated block 300, and the other end extends out of the tool box 200. The multiple air outlet pipelines 320 are used to transport compressed air from the compressed air circulation channel to the pipeline to be tested. For example, in a PECVD system, if there are 6 process cooling water pipelines and 6 heat exchange pipelines, there are 12 air outlet pipelines 320, of which 6 air outlet pipelines 320 are used to be connected to the 6 process cooling water pipelines, and the other 6 air outlet pipelines are used to be connected to the 6 heat exchange pipelines. The above is just an example. The number of the gas outlet pipelines 320 can be set as needed. For example, if there are 3 process cooling water pipelines and 3 heat exchange pipelines in the PECVD, only 6 gas outlet pipelines 320 can be set. Of course, more pipelines can be set to enable detection suitable for different situations. For example, in two sets of PECVD, one set has 6 process cooling water pipelines and 6 heat exchange pipelines, and the other set has 3 process cooling water pipelines and 3 heat exchange pipelines, then 12 gas outlet pipelines can be set so that any set of PECVD pipelines can be detected for pipeline leakage.

[0055] The tool box 200 is used to accommodate and fix the gas circuit integrated block 300, so as to protect the gas circuit integrated block and the inlet pipe 310, the outlet pipe 320 and the digital pressure gauge connected thereto from being damaged by collision. The upper cover of the tool box 200 can be opened, and the upper cover can be connected to the side wall of the tool box by a hinge, so that the tool box can be opened when repair is needed.

[0056] The gas circuit integrated block 300 can be fixed in the tool box 200 by bolts, or the gas circuit integrated block 300 can be placed on the bottom plate of the tool box 200, and a groove can be provided on the bottom plate, and the gas circuit integrated block 300 is placed in the groove, so as to prevent the gas circuit integrated block 300 inside from moving when the tool box is taken in and out. In addition, rollers can be installed at the bottom of the tool box 200 to facilitate movement.

[0057] The digital pressure gauge includes a first digital pressure gauge 410 and a second digital pressure gauge 420. The first digital pressure gauge 410 is connected to the tube body of the air inlet pipeline located inside the tool box 200. The second digital pressure gauge 420 is installed on the tube body of the air outlet pipeline 320 located outside the tool box 200. The digital pressure gauge has the advantages of digitally displaying pressure and high reliability, and its accuracy can reach 0.01.

[0058] The first digital pressure gauge 410 and the second digital pressure gauge 420 can be connected to the computer 700 through a line, and the detected pressure data can be transmitted to the computer 700 in real time. When it is necessary to detect whether the pipeline to be tested is leaking, dry compressed air is input into the air circuit integrated block 300 through the air inlet pipeline 310, and the compressed air is input into each pipeline to be tested through the air outlet pipeline, and left to stand for a period of time. The second digital pressure gauge 420 is used to detect the compressed air pressure of each pipeline to be tested, and transmit the pressure to the computer 700 in real time. When the compressed air pressure drops below the pressure drop threshold after standing still, it can be determined that the pipeline to be tested has a leak.

[0059] An air inlet valve 510 is installed on the tube body of the air inlet pipeline 310 located outside the tool box 200. When the air inlet valve 510 is closed, the passage between the dry compressed air and the air circuit integrated block 300 is cut off. When the air inlet valve 510 is opened, the passage between the dry compressed air and the air circuit integrated block 300 is opened. An air outlet valve 520 is installed on the tube body of the air outlet pipeline located outside the tool box 200 and between the second digital pressure gauge 420 and the tool box 200. When the air outlet valve 520 is closed, the passage between the air circuit integrated block 300 and the pipeline to be tested is cut off. When the air outlet valve 520 is opened, the passage between the air circuit integrated block 300 and the pipeline to be tested is opened.

[0060] In order to ensure the accuracy of the detection, the first digital pressure gauge 410 can be used to monitor whether the leakage detection device itself is leaking. The outlet valve 520 on the outlet pipeline can be closed, the inlet valve 510 can be opened, and dry compressed air can be input into the leakage detection device through the inlet pipeline 310, and the air pressure drop can be used to determine whether the leakage detection device is leaking. If the leakage detection device itself is leaking, the leaking part needs to be repaired before it can be used to detect the pipeline to be tested.

[0061] For easy connection, the air outlet pipeline 320 can be connected to the pipeline to be tested through a hose 600, which can be easily changed in direction, has a flexible length, and is easy to store to adapt to the distance and location of the pipeline to be tested. In addition, the air inlet pipeline 310 can also be connected to the compressed air source through a hose. For example, a 1-inch hose is used to connect to the process cooling water pipeline, and a 3 / 8-inch hose is used to connect to the heat exchange pipeline.

[0062] Among them, the pipeline of the air inlet pipeline 310 in the tool box 200 and the pipeline outside the tool box can be set to be detachably connected. Similarly, the pipeline of the air outlet pipeline in the tool box 200 and the pipeline outside the tool box can also be set to be detachably connected. The connection can be threaded connection, quick plug connection, etc. In this way, the pipeline outside the tool box can be disassembled and put into the tool box, and then connected when in use. Of course, the tool box can also directly accommodate the entire air circuit integrated block 300, and all the air inlet pipelines 310, air outlet pipelines 320, air inlet valves 510 and air outlet valves 520 are all accommodated in the tool box 200.

[0063] The gas circuit integrated block 300 is also provided with a vent pipeline and a vent valve. The vent pipeline 340 and the vent valve 350 can be set on the side of the gas circuit integrated block 300 opposite to the air inlet pipeline 310. After the detection is completed, the air can be exhausted through the vent pipeline to relieve the pressure in the leakage detection device. After the pressure is relieved, the connection between the outlet pipeline 320 and the pipeline to be tested, as well as the connection between the air inlet pipeline 310 and the compressed air source can be safely removed.

[0064] The tool box 200 also has a power adapter 800, which is used to connect to an external power source to supply power to each digital pressure gauge. Of course, the present application does not exclude that the digital pressure gauge can be powered by a battery.

[0065] The computer 700 can be connected to a digital pressure gauge via a DeviceNet network (a field bus standard used in automation technology) to collect pressure data. If a leak occurs in the pipeline to be tested, it will inevitably cause the air pressure in the pipeline to be tested to drop. The smaller the leak hole, the smaller the air pressure drop, and the larger the leak hole, the more the air pressure drops. The computer 700 determines whether a leak occurs based on the air pressure drop. Specifically, the following formula can be used to determine.

[0066] V1-V2=ΔV, if ΔV>pressure drop threshold, leakage is determined

[0067] Wherein, V2 is the final pressure in the pipeline to be tested, which indicates the air pressure in the pipeline to be tested after being left stationary for a period of time, for example, 6 hours;

[0068] V1 is the initial pressure of the air in the pipeline to be tested, the range is 7.0kg / cm 2 Up to 8.0kg / cm 2 ;

[0069] ΔV is the voltage drop;

[0070] The pressure drop threshold is 0.1kg / cm 2 Up to 0.3kg / cm 2 within the range.

[0071] In addition, the process cooling water pipeline and the heat exchange pipeline may produce scale flakes attached to the pipe wall during long-term use, and some scale flakes may fall off. When the compressed air is discharged through the venting pipeline 340 after the detection is completed, since the internal pressure is greater than the external atmospheric pressure, the scale flakes may follow the air flow into the pipeline of the leak detection device. Large scale flakes may cause the pipeline of the leak detection device to be blocked. To prevent this from happening, Figure 4 , Figure 5 As shown, a filter 321 can be set at the end of the outlet pipeline 320 connected to the pipeline to be tested. When the vent valve 350 is opened, the scale flakes will be pushed by the compressed air flow and collide with the filter 321, and the small scale flakes can pass through the filter 321 and be discharged from the vent pipeline 340. Large scale flakes are blocked in the pipeline to be tested because their size is larger than the filter mesh, thereby preventing the leakage detection device from being blocked. As for the removal of scale in the process cooling water pipeline and the heat exchange pipeline, various conventional scale removal methods can be used, and this application does not limit this.

[0072] Moreover, a screw 322 is fixed on the outer periphery of the filter 321, one end of the screw 322 is fixed on the outer periphery of the filter 321, and the other end extends radially outward. On the inner wall of the outlet pipe 320, preferably close to the inner wall of the end connected to the pipe to be tested, a radial internal thread is provided. The screw 322 is connected to the internal thread and screwed on the inner wall of the outlet pipe. By rotating the filter 321, the axis of the filter 321 can be made perpendicular to the axis of the outlet pipe, or parallel to the axis of the outlet pipe. If it is parallel to the axis of the outlet pipe, it can play a filtering role, and if it is perpendicular to the axis of the outlet pipe, it basically has no filtering role. The direction of the filter can be adjusted as needed. For example, if there is no scaling in the pipe to be tested, the axis of the filter 321 can be rotated perpendicular to the axis of the outlet pipe. If there is scaling in the pipe to be tested, the axis of the filter 321 can be rotated parallel to the axis of the outlet pipe. Moreover, the sum of the diameter of the filter screen 321 and the length of the screw is smaller than the inner diameter of the air outlet pipeline, so that the filter screen 321 can be loosened and removed when necessary.

[0073] The following describes the method for using the leak detection device. Before using the leak detection device to detect the pipeline to be tested, the leak detection device can be first tested for leaks. Close the outlet valves 520 on each outlet pipeline to block the outlet pipeline. Connect the air inlet pipeline 310 to the compressed air source, open the air inlet valve 510, input dry compressed air into the compressed air circulation channel and the outlet pipeline through the air inlet pipeline 310, and the dry compressed air enters the compressed air circulation channel and the outlet pipeline 320. Let it stand for a period of time, for example, 2 hours, obtain the pressure data of the first digital pressure gauge 410 through the computer 700, and judge whether the leak detection device has a leak by the pressure drop. If the leak detection device leaks, it is necessary to repair the leak detection device first.

[0074] After confirming that the leak detection device has no leaks, open the outlet valve 520 on the outlet pipeline 320, so that each outlet pipeline 320 is connected to the pipeline to be tested, for example, 6 of the outlet pipelines are connected to 6 process cooling water pipelines, and the other 6 outlet pipelines are connected to 6 heat exchange pipelines. It should be noted that before the connection, it should be confirmed whether the cooling water in each pipeline to be tested has been emptied. When the cooling water is emptied, the outlet pipeline 320 is connected to the pipeline to be tested. Dry compressed air is introduced into the pipeline to be tested, and the air pressure in each pipeline to be tested is obtained through the second digital pressure gauge. When the air pressure reaches the set initial pressure V1, for example, the set initial pressure V1 is 7.0kg / cm2, the dry compressed air is stopped and left to stand for a period of time, for example, 6 hours. For each pipeline to be tested, the computer 700 obtains the pressure data of the second digital pressure gauge in real time, thereby calculating the pressure drop ΔV of the initial pressure V1-final pressure V2, and determines whether there is a leak based on the comparison between the pressure drop ΔV and the pressure drop threshold. If the pressure drop ΔV is less than the pressure drop threshold, it is determined that there is no leak; if the pressure drop ΔV is greater than the pressure drop threshold, it is determined that there is a leak.

[0075] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A leakage detection device, characterized in that: include: Tool box with built-in gas circuit manifold; An air circuit integrated block, having a compressed air circulation channel, having an air inlet pipeline and a plurality of air outlet pipelines connected to the compressed air circulation channel, wherein the air inlet pipeline is used to be connected to a compressed air source, and the plurality of air outlet pipelines are used to be connected to a plurality of pipelines to be tested; Digital pressure gauge, installed on the air inlet and outlet pipes; The computer is connected to each digital pressure gauge and determines whether there is a leak based on the air pressure drop in the pipeline to be tested. Among them, one end of the air inlet pipeline is connected to the compressed air circulation channel of the air circuit integrated block, and the other end extends out of the tool box and is connected to the compressed air source; one end of the multiple air outlet pipelines is connected to the compressed air circulation channel of the air circuit integrated block, and the other end extends out of the tool box and is correspondingly connected to multiple pipelines to be tested.

2. The leakage detection device according to claim 1, characterized in that: The air inlet pipeline and the multiple air outlet pipelines are detachably connected inside and outside the tool box.

3. The leakage detection device according to claim 2, characterized in that: The digital pressure gauge includes a first digital pressure gauge and a second digital pressure gauge, wherein the first digital pressure gauge is connected to a tube body of an air inlet pipeline located inside the tool box, and the second digital pressure gauge is installed on a tube body of an air outlet pipeline located outside the tool box.

4. The leakage detection device according to claim 2, characterized in that: An air inlet valve is installed on the tube body of the air inlet pipeline located outside the tool box, and an air outlet valve is installed on the tube body of the air outlet pipeline located outside the tool box.

5. The leakage detection device according to claim 1, characterized in that: The air outlet pipeline is connected to the pipeline to be tested through a hose.

6. The leakage detection device according to claim 1, characterized in that: The upper cover of the tool box is openable and closable.

7. The leakage detection device according to claim 1, characterized in that: The gas path integrated block is also provided with a venting pipeline and a venting valve.

8. The leakage detection device according to claim 1, characterized in that: The computer is connected to the digital pressure gauge via a DeviceNet network.

9. The leakage detection device according to claim 8, characterized in that: A filter screen is arranged at the end where the air outlet pipeline is connected to the pipeline to be tested.

10. The leakage detection device according to claim 9, characterized in that: A screw extending radially outward is fixed on the outer periphery of the filter screen, and the screw is screwed on the inner wall of the air outlet pipeline. The filter screen is rotated so that the axis of the filter screen is perpendicular or parallel to the axis of the air outlet pipeline.

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