Portable leak detector and test method thereof

Abstract

The portable leak detector comprises a support and a breather pipe arranged on the support, the two tail ends of the breather pipe are connected with an air inlet pipe and an air outlet pipe respectively, and a flow meter, a pressure regulating valve, a pressure relief protection device and a pressure sensor are sequentially arranged in the air flowing direction of the breather pipe. The gas inlet pipe is externally connected with a compressed gas generating device, the gas outlet pipe is used for being connected with a tested part, the pressure regulating valve is used for regulating the pressure and flow of gas introduced into the tested part, and the pressure relief protection device is used for releasing the gas with the pressure larger than the test pressure. According to the portable leak detector and the testing method thereof provided by the invention, the size is small, the weight is light, the leak detector can be moved everywhere by only one person, and the portable leak detector can be used in a narrow space.

Description

Technical Field

[0001] The invention relates to the technical field of sealing testing equipment, and in particular to a portable leak detector and a testing method thereof. Background Art

[0002] Gas leakage tests are required for equipment with relatively high sealing requirements, such as the desorption pipe system in VOC purification and recovery equipment, ventilation pipes and boxes with high sealing requirements, and oil fume purifiers, in order to ensure production safety and environmental protection.

[0003] At present, the method for testing the gas leakage of the tested component is to use a high-pressure blower to blow gas into the tested component, then find the place where the tested component leaks, and estimate the gas leakage of the tested component by the frequency of the frequency converter. However, the existing leak detection equipment has the disadvantages of being large in size, heavy in weight, and difficult to carry. In particular, when the tested component is located on the top floor of a building, it takes a lot of manpower and time to carry it. When the space where the tested component is located is relatively narrow, it is difficult to place the leak detection equipment for testing, thereby increasing the difficulty of testing.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a portable leak detector with a small size and light weight. Only one person is needed to move the leak detector to various places and it is not limited to narrow space. The present invention also provides a testing method of the portable leak detector, which can accurately measure the gas leakage of the tested component under a fixed pressure.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A portable leak detector comprises a bracket and a vent pipe arranged on the bracket, wherein the two ends of the vent pipe are respectively connected to an air inlet pipe and an air outlet pipe, and a flow meter, a pressure regulating valve, a pressure relief protection device and a pressure sensor are sequentially arranged along the gas flow direction of the vent pipe, the air inlet pipe is externally connected to a compressed gas generating device, the air outlet pipe is used to connect to a component to be tested, the pressure regulating valve is used to adjust the gas pressure and flow rate entering the component to be tested, and the pressure relief protection device is used to release gas greater than the test pressure.

[0008] Furthermore, the bracket includes a base and two telescopic columns vertically arranged on the base, the ventilation pipe is arranged on the top of the two telescopic columns, and the base is a horizontally placed H-shaped structure.

[0009] Furthermore, the pressure relief protection device is located between two telescopic columns.

[0010] Furthermore, the telescopic column includes a fixed rod fixed on the base, and a movable rod sleeved in the fixed rod, a first locking screw is threadedly connected to the fixed rod, and a tip of the first locking screw abuts against a peripheral wall of the movable rod.

[0011] Furthermore, the pressure relief protection device includes a pressure relief pipe connected to the ventilation pipe and a water storage cylinder arranged on the pressure relief pipe, and a drain valve is provided at the bottom of the water storage cylinder.

[0012] Furthermore, the pressure relief pipe is provided with a scale extending along the length direction thereof.

[0013] Furthermore, a sliding sleeve is provided on the top of the water storage cylinder, and the sliding sleeve is slidably provided on the pressure relief pipe. A second locking screw is provided on the sliding sleeve, and the end of the second locking screw abuts against the peripheral wall of the pressure relief pipe.

[0014] A testing method for a portable leak detector, applied to the portable leak detector, comprising:

[0015] S01, according to the test pressure value of the tested component, a certain amount of water is filled into the water container so that the pressure of the water entering the pressure relief pipe is the same as the test pressure value;

[0016] S02, adjust the pressure regulating valve to the minimum gas flow rate, and then introduce compressed gas into the air inlet pipe, and the compressed gas flows to the component under test through the air vent pipe and the air outlet pipe;

[0017] S03, slowly adjusting the pressure regulating valve to increase the compressed gas flowing to the component under test until the pressure reading on the pressure sensor reaches the test pressure value of the component under test; when the pressure reading exceeds the test pressure value, reduce the pressure regulating valve so that the pressure reading is the test pressure value;

[0018] S04, after the pressure reading on the pressure sensor is stable, read the instantaneous flow value on the flow meter, which is the leakage amount of the tested component under the test pressure.

[0019] Beneficial effects:

[0020] The present invention provides a portable leak detector, in which a vent pipe is installed on a bracket, one end of the vent pipe is connected to compressed gas through an air inlet pipe, and the other end of the vent pipe passes the compressed gas into a component to be tested through an air outlet pipe. The structure is small in size and light in weight, and is convenient for one person to carry independently, and can be used in a narrow space; in addition, a pressure relief protection device is provided on the vent pipe, which can protect the component to be tested and the pressure sensor.

[0021] The present invention also provides a testing method for a portable leak detector, wherein the pressure and flow rate of the gas entering the tested component can be adjusted through a pressure regulating valve, and the gas pressure of the tested component can be maintained at the measured pressure value, and finally the leakage amount of the tested component under a fixed pressure can be obtained through the reading on the flow meter. The operation is simple and the measurement accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A structural diagram of a portable leak detector provided by the present invention;

[0023] Figure 2 A partial exploded view of the portable leak detector provided by the present invention;

[0024] Figure 3 A front view of the pressure relief protection device of the portable leak detector provided by the present invention;

[0025] Figure 4 An exploded view of the pressure relief protection device of the portable leak detector provided by the present invention.

[0026] Figure numerals: bracket 1, base 11, telescopic column 12, fixed rod 121, movable rod 122, first locking screw 123, vent pipe 2, air inlet pipe 3, switch valve 31, air outlet pipe 4, flow meter 5, pressure regulating valve 6, pressure relief protection device 7, pressure relief pipe 71, water cylinder 72, drain valve 73, scale 74, sliding sleeve 75, second locking screw 76, pressure sensor 8. DETAILED DESCRIPTION

[0027] The present invention provides a portable leak detector and a testing method thereof. To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] See also Figures 1 to 4 As shown, the present invention provides a portable leak detector, including a bracket 1 and a ventilation pipe 2 arranged on the bracket 1, the two ends of the ventilation pipe 2 are respectively connected to an inlet pipe 3 and an outlet pipe 4, a flow meter 5, a pressure regulating valve 6, a pressure relief protection device 7 and a pressure sensor 8 are sequentially arranged along the gas flow direction of the ventilation pipe 2, the inlet pipe 3 is externally connected to a compressed gas generating device, the outlet pipe 4 is used to connect to the component to be tested, the pressure regulating valve 6 is used to adjust the gas pressure and flow rate entering the component to be tested, and the pressure relief protection device 7 is used to release the gas greater than the test pressure.

[0029] In actual use, the pressure relief protection device 7 is adjusted according to the test pressure value of the measured component. Once the gas pressure entering the measured component is greater than the test pressure, the gas is released to prevent excessive gas from flowing into the measured component and causing excessive pressure, thereby protecting the measured component and preventing the pressure sensor from over-range. The compressed gas flows into the measured component through the inlet pipe 3, the vent pipe 2 and the outlet pipe 4. The pressure regulating valve 6 is slowly adjusted to allow more gas to flow into the measured component. Since the vent pipe 2 is connected to the measured component, the air pressure value (pressure reading) measured by the pressure sensor 8 is the air pressure value in the measured component. In this process, when the pressure reading of the pressure sensor 8 is less than the test pressure value, the pressure regulating valve 6 is continued to be increased; when the pressure reading on the pressure sensor 8 exceeds the test pressure value, the pressure regulating valve 6 is reduced so that the pressure reading is the test pressure value. When the pressure reading on the pressure sensor 8 is stable at the test pressure value of the measured component, the instantaneous flow value on the flow meter 5 is read. The flow value is the leakage amount of the measured component under the test pressure. In addition, when the flow value is 0, it means that the tested component has no leakage under fixed pressure and has good sealing performance.

[0030] In the above, the compressed gas generating device can be a compressed gas source in the production environment. The enterprise transports the compressed gas generated by the compressor to various places through multiple pipelines. Therefore, the air inlet pipe 3 can be connected to any compressed gas source, and compressed gas can be introduced into the ventilation pipe 2.

[0031] Preferably, see Figure 1 A switch valve 31 is provided between the end of the air inlet pipe 3 and the end of the vent pipe 2 to control the introduction and cutoff of the compressed gas. In addition, the switch valve 31 is provided at the end of the vent pipe 2. By closing the switch valve 31, the compressed gas introduced into the measured component can be immediately cut off to prevent the measured component from being filled with excessive gas and causing irreversible effects on the measured component.

[0032] The portable leak detector of the present invention can simplify the structure of the device by installing the ventilation pipe 2 on the bracket 1, and the ventilation pipe 2 is connected to the compressed air source through the air inlet pipe 3, and the ventilation pipe 2 is connected to the component to be tested through the air outlet pipe 4. The device has a small size, light weight, and is easy to carry. It can be placed in a narrow space for use with few restrictions on use.

[0033] It should be further noted that the installation positions of the flow meter 5 and the pressure regulating valve 6 are interchangeable, that is, the pressure regulating valve 6, the flow meter 5, the pressure relief protection device 7 and the pressure sensor 8 are arranged in sequence along the gas flow direction of the ventilation pipe 2, and the specific installation order can be determined according to actual use.

[0034] In a preferred embodiment, see Figure 2The bracket 1 includes a base 11 and two telescopic columns 12 vertically arranged on the base 11, and the vent pipe 2 is arranged on the top of the two telescopic columns 12. The base 11 is a horizontally placed H-shaped structure. The H-shaped base 11 makes the bracket 1 have good stability, which can ensure that the portable leak detector is placed stably during the test.

[0035] During transportation, the leak detector can be moved by the portable ventilation pipe 2, and one person can complete the transportation of the leak detector, which is simple and convenient. In addition, the two telescopic columns 12 are adjusted to a shortened state to reduce the total height of the bracket 1, and because both ends of the ventilation pipe 2 extend outside the bracket 1, the air inlet pipe 3 and the air outlet pipe 4 can be respectively arranged at the ends of the ventilation pipe 2, which can further facilitate the transportation and storage of the leak detector.

[0036] Further, see Figure 2 The pressure relief protection device 7 is located between the two telescopic columns 12, so that the center of gravity is located in the middle of the bracket 1, further ensuring the stability of the bracket 1.

[0037] In a preferred embodiment, see Figure 2 The telescopic column 12 includes a fixed rod 121 fixed on the base 11, and a movable rod 122 sleeved in the fixed rod 121. The fixed rod 121 is threadedly connected with a first locking screw 123, and the end of the first locking screw 123 abuts against the peripheral wall of the movable rod 122. When adjusting, the first locking screw 123 is loosened, and the position of the movable rod 122 on the fixed rod 121 is adjusted, so that the vent pipe 2 is adjusted to a suitable height, and then the first locking screw 123 is tightened to lock the position of the movable rod 122.

[0038] Preferably, the first locking screw 123 is a torx hand screw to facilitate adjusting the height of the bracket 1 .

[0039] Preferably, the height of the pressure relief protection device 7 is lower than the height of the telescopic column 12 in the shortened state, so as to avoid interference between the pressure relief protection device 7 and the base frame when the telescopic column 12 is shortened.

[0040] In a preferred embodiment, see Figure 3 , 4The pressure relief protection device 7 includes a pressure relief pipe 71 connected to the vent pipe 2 and a water cylinder 72 arranged on the pressure relief pipe 71. A drain valve 73 is arranged at the bottom of the water cylinder 72 to drain the water in the water cylinder 72. After the water cylinder 72 is filled with water, the lower end of the pressure relief pipe 71 is inserted into the water, so that the lower end of the pressure relief pipe 71 has a water column of a certain height, wherein the height of the water column is the distance between the bottom surface of the pressure relief pipe 71 and the liquid surface. According to the water pressure formula p=ρgh, wherein p is the pressure, ρ is the density of water, g is the acceleration of gravity, and h is the height of the water column; therefore, by controlling the amount of water in the water cylinder 72, the pressure of the water column in the pressure relief pipe 71 can be adjusted. When the pressure of the gas passing through the vent pipe 2 is greater than the pressure of the water column, the gas is discharged into the environment through the pressure relief pipe 71 and the water cylinder 72, thereby playing a role in protecting the measured components.

[0041] In practical applications, the pressure of the water column is slightly greater than the test pressure to ensure that the tested component can be leak tested under the test pressure conditions.

[0042] Further, see Figure 3 , 4 The pressure relief pipe 71 is provided with a scale 74 extending along its length, and the value on the scale 74 can be directly converted into a pressure value, so as to control the amount of water in the water container 72. It should be noted that the maximum value on the scale 74 should be the maximum measuring range of the pressure sensor 8, so as to avoid damage to the pressure sensor 8 caused by excessive gas pressure, thereby protecting the pressure sensor 8.

[0043] Preferably, the water container 72 is made of a transparent material, which is also convenient for observing the liquid level.

[0044] For further information, see Figure 3 , 4 The top of the water cylinder 72 is provided with a sliding sleeve 75, which is slidably arranged on the pressure relief pipe 71. The sliding sleeve 75 is provided with a second locking screw 76, and the end of the second locking screw 76 abuts against the peripheral wall of the pressure relief pipe 71. By adjusting the position of the sliding sleeve 75 on the pressure relief pipe 71, the distance between the bottom of the pressure relief pipe 71 and the liquid surface in the water cylinder 72 can be adjusted. When the water cylinder 72 moves downward, the liquid surface drops, and when the water cylinder 72 moves upward, the liquid surface rises, so that the liquid surface height can be adjusted to a certain scale on the scale 74.

[0045] The present invention provides a testing method of a portable leak detector, which is applied to the above-mentioned portable leak detector, comprising:

[0046] Step 1, according to the test pressure value of the measured component, fill a certain amount of water into the water cylinder 72 so that the pressure of the water entering the pressure relief pipe 71 is the same as the test pressure value; specifically, find the scale on the ruler 74 that is the same as the measured pressure value, and adjust the liquid level in the water cylinder 72 to the scale position, so that the pressure relief protection device 7 can protect the measured component. Once the air pressure is greater than the measured pressure value, the gas is discharged into the environment through the pressure relief pipe 71 and the water cylinder 72.

[0047] Step 2: The pressure regulating valve 6 is adjusted to the minimum gas flow rate, and compressed gas is introduced into the air inlet pipe 3. The compressed gas flows to the component under test through the air vent pipe 2 and the air outlet pipe 4, so that the air pressure in the component under test gradually increases.

[0048] Step 3: Slowly adjust the pressure regulating valve 6 to increase the compressed gas flowing to the tested component and increase the pressure rise rate in the tested component until the pressure reading on the pressure sensor 8 reaches the test pressure value of the tested component. In this process, when the pressure reading on the pressure sensor 8 is less than the test pressure value, the pressure regulating valve 6 is further increased; when the pressure reading on the pressure sensor 8 exceeds the test pressure value, the pressure regulating valve 6 is decreased so that the pressure reading is the test pressure value.

[0049] Step 4: After the pressure reading on the pressure sensor 8 is stable, read the instantaneous flow on the flow meter 5. The instantaneous flow value is the leakage of the tested component under the test pressure. Finally, the leakage can be used to determine whether the tested component meets the production requirements.

[0050] In summary, the portable leak detector and the testing method thereof provided by the present invention install the ventilation pipe 2 on the bracket 1, and the ventilation pipe 2 is connected to the compressed gas through the air inlet pipe 3, and the ventilation pipe 2 passes the compressed gas into the component to be tested through the air outlet pipe 4. The structure is small in size and light in weight, which is convenient for one person to carry independently and can be used in a narrow space; in addition, the pressure and flow rate of the gas entering the component to be tested can be adjusted by the pressure regulating valve 6, and the air pressure of the component to be tested can be maintained at the measured pressure value. Finally, the leakage amount of the component to be tested under a fixed pressure can be obtained by reading the reading on the flow meter 5. The operation is simple and the measurement accuracy is high.

[0051] Since the ventilation pipe 2 can be connected to any sealed component through the exhaust pipe 4, the portable leak detector and the testing method provided by the present invention can be applied to the desorption pipe of the VOC purification and recovery system and to various components connected to the desorption pipe, and can test the leakage of the entire desorption pipe system, or test the leakage of each component separately. In addition, it can also be applied to the sealing test of ventilation pipes with relatively high sealing performance, the sealing test of oil fume precipitators, the sealing test of electrical boxes and cabinets, or the sealing test of other boxes, and has a wide range of applications.

[0052] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. A portable leak detector, characterized in that: It includes a bracket and a ventilation pipe arranged on the bracket, the two ends of the ventilation pipe are respectively connected with an air inlet pipe and an air outlet pipe, a flow meter, a pressure regulating valve, a pressure relief protection device and a pressure sensor are arranged in sequence along the gas flow direction of the ventilation pipe, the air inlet pipe is externally connected to a compressed gas generating device, the air outlet pipe is used to connect to the component to be tested, the pressure regulating valve is used to adjust the gas pressure and flow entering the component to be tested, and the pressure relief protection device is used to release gas greater than the test pressure.

2. The portable leak detector according to claim 1, characterized in that: The bracket comprises a base and two telescopic columns vertically arranged on the base, the ventilation pipe is arranged on the top of the two telescopic columns, and the base is a horizontally placed H-shaped structure.

3. The portable leak detector according to claim 2, characterized in that: The pressure relief protection device is located between the two telescopic columns.

4. The portable leak detector according to claim 2, characterized in that: The telescopic column comprises a fixed rod fixed on the base and a movable rod sleeved in the fixed rod. A first locking screw is threadedly connected to the fixed rod, and the end of the first locking screw abuts against the peripheral wall of the movable rod.

5. The portable leak detector according to claim 1, characterized in that: The pressure relief protection device comprises a pressure relief pipe communicated with the ventilation pipe and a water storage cylinder arranged on the pressure relief pipe, and a drainage valve is arranged at the bottom of the water storage cylinder.

6. The portable leak detector according to claim 5, characterized in that: The pressure relief pipe is provided with a ruler extending along the length direction thereof.

7. The portable leak detector according to claim 5, characterized in that: A sliding sleeve is provided on the top of the water container, and the sliding sleeve is slidably arranged on the pressure relief pipe. A second locking screw is provided on the sliding sleeve, and the end of the second locking screw abuts against the peripheral wall of the pressure relief pipe.

8. A method for testing a portable leak detector, characterized in that: The portable leak detector as claimed in claim 5 comprises: S01, according to the test pressure value of the tested component, a certain amount of water is filled into the water container so that the pressure of the water entering the pressure relief pipe is the same as the test pressure value; S02, adjust the pressure regulating valve to the minimum gas flow rate, and then introduce compressed gas into the air inlet pipe, and the compressed gas flows to the component under test through the air vent pipe and the air outlet pipe; S03, slowly adjusting the pressure regulating valve to increase the compressed gas flowing to the component under test until the pressure reading on the pressure sensor reaches the test pressure value of the component under test; when the pressure reading exceeds the test pressure value, reduce the pressure regulating valve so that the pressure reading is the test pressure value; S04, after the pressure reading on the pressure sensor is stable, read the instantaneous flow value on the flow meter, which is the leakage amount of the tested component under the test pressure.

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