Calibration device and calibration method for gas leakage prevention detector

Abstract

The invention relates to the field of gas detectors, in particular to a gas leak-proof detector calibration device and a calibration method.The gas leak-proof detector calibration device comprises a box body, a fixing mechanism for fixing a detector is arranged on the side wall of the bottom end of the box body, and a testing mechanism for conveying gas is arranged at the bottom end of the inner side wall of the box body; according to the gas leak-proof detector calibration device and calibration method, through gas path cleaning before calibration and self-checking design in the calibration process, residual gas interference is eliminated, the reliability of the calibration process and the effectiveness of the result are guaranteed, the pressure of the test gas tank is monitored in real time through the first pressure sensor in the calibration process, and the calibration accuracy is improved. By means of the design, calibration failure caused by cross contamination and leakage of residual gas is effectively avoided, the one-time passing rate of the calibration process is increased, and the calibration efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of gas detectors, and in particular to a calibration device and calibration method for a gas leak detection instrument. Background Technology

[0002] Gas leak detectors, as core equipment for ensuring industrial production safety and environmental monitoring compliance, are widely used in petrochemical, gas transmission, new energy vehicles, and medical device industries. Their detection accuracy is directly related to personnel safety and the stability of production operations.

[0003] The existing gas leak detector calibration device has many shortcomings: First, incomplete cleaning of the gas path can lead to residual gas from previous calibration mixing with the current calibration gas, interfering with the calibration results, affecting detection accuracy, and resulting in significant calibration errors. Second, the positioning and fixing accuracy is low. Traditional devices require manual adjustment of the detector position, making it difficult to ensure precise alignment between the detector port and the calibration gas path interface. This can easily cause additional leaks due to misalignment. Furthermore, the rigid fixing structure can easily damage the detector casing. In addition, the calibration process lacks a self-verification mechanism and cannot monitor the leakage status at the calibration gas path connection in real time. If a leak occurs, it will directly cause the calibration data to become invalid, and re-disassembly and recalibration are required, resulting in low efficiency. To solve the above problems, we propose a gas leak detector calibration device and calibration method. Summary of the Invention

[0004] The main objective of this invention is to provide a calibration device and method for a gas leak detector, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A gas leak detector calibration device includes a housing. The bottom side wall of the housing is provided with a fixing mechanism for fixing the detector. The bottom of the inner side wall of the housing is provided with a testing mechanism for conveying gas. The testing mechanism includes a support frame at the bottom of the inner side wall of the housing and a first gas transmission pipe at the top of the support frame.

[0006] Preferably, the outer wall of the first air transmission tube has multiple holes, and a one-way valve is fixedly connected to the inner wall of the holes. An extension tube is provided at one end of the first air transmission tube, and a second air transmission tube is provided at the other end of the extension tube. Two first fixing blocks are provided on the outer wall of the first air transmission tube, and two second fixing blocks are provided on the outer wall of the second air transmission tube. A second electric telescopic rod is provided at one end of each of the two first fixing blocks, and the telescopic ends of the two second electric telescopic rods are respectively fixedly connected to one end of the two second fixing blocks.

[0007] Preferably, both the first and second air transmission pipes have baffles on their outer walls. Each of the first and second air transmission pipes has a slot on one end of its outer wall, with a first air ring fixedly connected to the inner wall of the slot. Each of the first and second air transmission pipes also has another slot on one end of its outer wall, with a second air ring fixedly connected to the inner wall of the slot. A support rod is rotatably connected to the inner walls of the first and second air transmission pipes. One end of the support rod has a bidirectional threaded rod, and the outer wall of the bidirectional threaded rod has a second step and a first step.

[0008] Preferably, the other end of the bidirectional threaded rod is provided with a guide rod, the bottom end of the guide rod is provided with a first electric telescopic rod, the telescopic end of the first electric telescopic rod is provided with a first rotating plate, one end of the first rotating plate is provided with a second motor, the output end of the second motor is provided with a roller, and the top end of the first rotating plate is provided with a second pressure sensor.

[0009] Preferably, the fixing mechanism includes a third electric telescopic rod provided on the bottom side wall of the box, a third fixing block provided at the telescopic end of the third electric telescopic rod, a bearing plate provided at the top of the third fixing block, the bearing plate being slidably connected to the inner side wall of the box, a third motor provided on the bottom side wall of the bearing plate, a second gear provided at the output end of the third motor, and a third gear being rotatably connected to the inner side wall of the bearing plate, the third gear meshing with the second gear.

[0010] Preferably, a second rotating plate is provided on the top side wall of the third gear, and a testing instrument is detachably connected to the top of the second rotating plate. Two fourth electric telescopic rods are provided on the inner side wall of the second rotating plate, and a positioning plate is provided at the telescopic end of each of the two fourth electric telescopic rods. A sleeve is provided on the top side wall of the bearing plate, and the bottom end of the sleeve is rotatably connected to the top of the second rotating plate. Two fifth electric telescopic rods are provided on the inner side wall of the sleeve, and a clamping plate is provided at the telescopic end of each of the two fifth electric telescopic rods.

[0011] Preferably, the outer wall of the sleeve is provided with two fourth fixing blocks, the top side wall of the bearing plate is provided with two sixth electric telescopic rods, the telescopic ends of the two sixth electric telescopic rods are respectively fixedly connected to the bottom ends of the two fourth fixing blocks, the top of the sleeve is provided with a support plate, and a positioning sensor is provided on one side wall of the support plate.

[0012] Preferably, a display screen is provided on one side wall of the housing, an adjustment plate is provided at one end of the housing, a test air chamber is provided on one side wall of the adjustment plate, a cleaning air chamber is provided on one side wall of the adjustment plate, and a first pressure sensor is provided at one end of both the cleaning air chamber and the test air chamber.

[0013] Preferably, a first air pump is provided on one side wall of the adjustment plate, and a connecting sleeve is provided at one end of the first air pump, the cleaning air box, and the test air box. A hose is detachably connected to the other end of the connecting sleeve, and a connecting pipe is provided at the other end of the first air pump through the adjustment plate.

[0014] Preferably, both the second gas transmission tube and the first gas transmission tube are provided with a detection mechanism for gas detection at the pipe connection on their outer walls. The detection mechanism includes a sealing shell provided on the outer walls of the first and second gas transmission tubes. An electric sliding groove is provided on the inner wall of the sealing shell. An electric slider is slidably connected to the inner wall of the electric sliding groove. A gas sensor is provided at one end of the electric slider. A second air pump is provided on one side wall of the sealing shell. A sealing strip is provided on the inner wall of the sealing shell.

[0015] A calibration method for a gas leak detector includes the following steps: S1: Place the testing instrument stably at the center of the top of the second rotating plate. Activate the fourth electric telescopic rod, and the two positioning plates will simultaneously advance inward until they gently fit against the side wall of the testing instrument. The positioning sensor will locate the switch on the surface of the testing instrument. If the angle of the testing instrument is deviated and the positioning sensor does not correspond to the switch on the surface of the testing instrument, the third motor will be activated, driving the second gear to mesh with the third gear. The second rotating plate will rotate slowly, and the positioning sensor will monitor the circumferential position of the instrument port in real time until the positioning sensor aligns with the switch on the surface of the testing instrument. At this time, the center of the port and the air transmission tube interface will be on the same horizontal line. The third motor will stop running, completing the precise angle positioning. Then, activate the fifth electric telescopic rod, and the two clamping plates will clamp the testing instrument from both sides. The side of the clamping plate that contacts the testing instrument is made of soft silicone material, completing the fixation. Then, activate the sixth electric telescopic rod, and the fourth fixing block will drive the sleeve to move up and down, adjusting the height of the testing instrument so that the height of the instrument testing port is consistent with the interface of the first air transmission tube and the second air transmission tube, and the center is completely aligned. Then, activate the third electric telescopic rod, and the third fixing block will drive the carrier plate to move slowly to the working position. S2: Start the second air pump to evacuate the inside of the sealed shell. Turn off the second air pump and hold for ten seconds. Start the electric slide rail. The electric slider drives the gas sensor to move at a constant speed along the inner wall of the sealed shell to detect any leaks at the connection points and provide a prompt on the display screen. At this time, the center of the connection pipe of the first air pump and the interface of the second air transmission pipe are completely aligned. Then, start the second electric telescopic rod. The first and second fixed blocks drive the second air transmission pipe to extend and retract along the extension pipe, so that one end of the second air transmission pipe wraps around a connection pipe port and one end of the connection pipe is in contact with the baffle to limit excessive advancement. Then, start the two first electric telescopic rods, so that the telescopic ends drive the rollers to approach the inner wall of the instrument port and the inner wall of the connection pipe respectively. The second pressure sensor provides feedback on the pressure. Then, start the second motor to drive the rollers to rotate. Through the transmission structure, the bidirectional threaded rod rotates. The first and second step blocks move in opposite directions along the bidirectional threaded rod, thereby squeezing the first and second air rings respectively, so that the two first air rings and the two second air rings are tightly in contact with the inner wall of the instrument port and the connection pipe respectively, forming two seals. S3: Connect the connecting sleeve at one end of the cleaning gas chamber to the connecting sleeve at one end of the first gas pump via a hose. Open the valve of the cleaning gas chamber and run the first gas pump to allow nitrogen to enter the sealed cavity through the connecting pipe, the first gas transmission pipe, and the second gas transmission pipe. This removes residual impurities, moisture, and previously calibrated gas from the gas path. Finally, the gas is discharged through the one-way valve. After cleaning, close the valve of the first gas pump and stop purging. Once the pressure and gas state inside the cavity have stabilized, close the valve of the cleaning gas chamber. Connect the connecting sleeve at one end of the test gas chamber to the connecting sleeve at the first gas pump via a hose. Then, open the valve of the test gas chamber and simultaneously start the zero-point measurement function of the testing instrument through the display screen. Collect three zero-point readings continuously and record them. The control system automatically calculates the drift value. During the acquisition process, the testing mechanism continuously monitors the sealing status. If the gas sensor does not provide any leakage signal feedback, and a leak occurs, immediately stop the acquisition and re-perform the sealing test. Finally, start the reset procedure.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The calibration device and method for a gas leak detector, when connecting the calibration gas circuit, firstly, the second electric telescopic rod is activated to drive the second gas transmission tube to extend and retract along the extension tube, so that the second gas transmission tube wraps around the port of the connecting tube and fits against the baffle for limitation. Then, the first electric telescopic rod is activated to make the roller close to the instrument port and the inner wall of the connecting tube. The pressure value is fed back by the second pressure sensor to ensure a tight fit. Next, the second motor is activated to drive the bidirectional threaded rod to rotate, driving the first and second step blocks to move in opposite directions, respectively squeezing the first and second gas rings, so that they fit tightly against the inner wall of the interface, forming a double sealing barrier. At the same time, the detection mechanism is activated synchronously, so that the calibration gas leakage rate approaches zero.

[0017] 2. This gas leak detector calibration device and method, through pre-calibration gas path cleaning and self-verification design during the calibration process, eliminates residual gas interference, ensuring the reliability of the calibration process and the validity of the results. In the workflow, before introducing the calibration gas, the cleaning gas tank is first connected to the first gas pump via a hose. The first gas pump is then started to introduce nitrogen into the calibration gas path. The nitrogen flows through the connecting pipe, the first gas transmission pipe, and the second gas transmission pipe through the sealed cavity, removing residual impurities, moisture, and previous calibration gas from the gas path. Finally, it is discharged through a one-way valve, ensuring the gas path is clean and free from interference. During subsequent calibration gas introduction and parameter acquisition, the detection mechanism continuously monitors the sealing status, and the gas sensor provides real-time feedback on leakage at the connection point. If an abnormality occurs, data acquisition is immediately stopped and a warning is issued to avoid invalid calibration. Simultaneously, during the calibration process, the pressure of the test gas tank is monitored in real-time by the first pressure sensor to ensure stable calibration gas concentration. This design effectively avoids calibration failure caused by residual gas cross-contamination and leakage, increasing the first-pass yield of the calibration process and significantly improving calibration efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 This is a partial cross-sectional view of the fixing mechanism of the present invention; Figure 4 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 5 This is a partial structural diagram of the testing mechanism of the present invention; Figure 6 This is a second partial structural diagram of the testing mechanism of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point B in the middle; Figure 8 This is a partial structural cross-sectional view of the present invention.

[0019] In the diagram: 1. Housing; 12. Adjustment plate; 13. Connecting sleeve; 14. Hoses; 15. Cleaning air chamber; 16. Test air chamber; 17. First pressure sensor; 18. Connecting pipe; 19. Display screen; 110. Testing instrument; 111. First air pump; 2. Testing mechanism; 21. Support frame; 22. First air transmission pipe; 23. First air ring; 24. Second air ring; 25. Support rod; 26. Bidirectional threaded rod; 27. First step block; 28. Second step block; 29. ​​Guide rod; 210. First electric telescopic rod; 211. First rotating plate; 212. Second motor; 213. Roller; 214. Second pressure sensor; 215. First fixing block; 216. Second electric telescopic rod; 217. Second... 218. Fixed block; 219. Second air transmission pipe; 220. One-way valve; 221. Extension pipe; 222. Baffle; 3. Fixing mechanism; 31. Third electric telescopic rod; 32. Third fixed block; 33. Bearing plate; 34. Third motor; 35. Second gear; 36. Third gear; 37. Second rotating plate; 38. Fourth electric telescopic rod; 39. Positioning plate; 310. Sleeve; 311. Fifth electric telescopic rod; 312. Clamping plate; 313. Sixth electric telescopic rod; 314. Fourth fixed block; 315. Support plate; 316. Positioning sensor; 4. Detection mechanism; 41. Sealing shell; 42. Second air pump; 43. Electric slide rail; 44. Electric slider; 45. Gas sensor; 46. Sealing strip. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] like Figure 1 - Figure 8 As shown, a gas leak detector calibration device includes a housing 1. A fixing mechanism 3 for fixing the detector is provided on the bottom side wall of the housing 1. A testing mechanism 2 for conveying gas is provided on the bottom inner side wall of the housing 1. The testing mechanism 2 includes a support frame 21 provided on the bottom inner side wall of the housing 1. A first gas transmission pipe 22 is provided on the top of the support frame 21.

[0022] In this embodiment, the outer wall of the first air transmission pipe 22 has multiple holes, and a one-way valve 219 is fixedly connected to the inner wall of the holes. One end of the first air transmission pipe 22 is provided with an extension pipe 220, and the other end of the extension pipe 220 is provided with a second air transmission pipe 218. The outer wall of the first air transmission pipe 22 is provided with two first fixing blocks 215, and the outer wall of the second air transmission pipe 218 is provided with two second fixing blocks 217. Each of the two first fixing blocks 215 has a second electric telescopic rod 216 at one end, and the telescopic ends of the two second electric telescopic rods 216 are respectively fixedly connected to one end of the two second fixing blocks 217. Both the outer walls of the first air transmission pipe 22 and the second air transmission pipe 218 are provided with baffles 221. The outer walls of both the first air transmission pipe 22 and the second air transmission pipe 218 have slots, and a first air ring is fixedly connected to the inner wall of the slot. 23. Both the first air transmission pipe 22 and the second air transmission pipe 218 have another slot on the outer side wall of one end, and a second air ring 24 is fixedly connected to the inner side wall of the slot. The inner side walls of the first air transmission pipe 22 and the second air transmission pipe 218 are rotatably connected to a support rod 25. One end of the support rod 25 is provided with a bidirectional threaded rod 26. The outer side wall of the bidirectional threaded rod 26 is provided with a second step block 28 and a first step block 27. The other end of the bidirectional threaded rod 26 is provided with a guide rod 29. The bottom end of the guide rod 29 is provided with a first electric telescopic rod 210. The telescopic end of the first electric telescopic rod 210 is provided with a first rotating plate 211. One end of the first rotating plate 211 is provided with a second motor 212. The output end of the second motor 212 is provided with a roller 213. The top end of the first rotating plate 211 is provided with a second pressure sensor 214.

[0023] Specifically, the second electric telescopic rod 216 is activated, which drives the second air transmission tube 218 to extend and retract along the extension tube 220 via the first fixing block 215 and the second fixing block 217. This causes one end of the second air transmission tube 218 to wrap around the port of a connecting tube 18, and one end of the connecting tube 18 to fit against the baffle 221, limiting excessive extension. Subsequently, the two first electric telescopic rods 210 are activated, causing the telescopic ends to drive the rollers 213 to respectively approach the inner wall of the instrument port and the inner wall of the connecting tube 18. The second pressure sensor 214 provides feedback on the pressure magnitude. Then, the second motor 212 is activated, driving the rollers 213 to rotate. This drives the bidirectional threaded rod 26 to rotate through the transmission structure. The first step block 27 and the second step block 28 move in opposite directions along the bidirectional threaded rod 26, thereby squeezing the first air ring 23 and the second air ring 24 respectively. This causes the two first air rings 23 and the two second air rings 24 to fit tightly against the inner wall of the instrument port and the connecting tube 18, forming two seals.

[0024] In this embodiment, the fixing mechanism 3 includes a third electric telescopic rod 31 disposed on the bottom side wall of the housing 1. A third fixing block 32 is disposed at the telescopic end of the third electric telescopic rod 31. A bearing plate 33 is disposed at the top of the third fixing block 32. The bearing plate 33 is slidably connected to the inner side wall of the housing 1. A third motor 34 is disposed on the bottom side wall of the bearing plate 33. A second gear 35 is disposed at the output end of the third motor 34. A third gear 36 is rotatably connected to the inner side wall of the bearing plate 33. The third gear 36 meshes with the second gear 35. A second rotating plate 37 is disposed on the top side wall of the third gear 36. A detection instrument 110 is detachably connected to the top of the second rotating plate 37. Two fourth electric telescopic rods 38 are disposed on the inner side wall of the second rotating plate 37. Both fourth electric telescopic rods 38 are equipped with positioning plates 39 at their telescopic ends. A sleeve 310 is provided on the top side wall of the bearing plate 33. The bottom end of the sleeve 310 is rotatably connected to the top end of the second rotating plate 37. Two fifth electric telescopic rods 311 are provided on the inner side wall of the sleeve 310. A clamping plate 312 is provided on the telescopic end of each of the two fifth electric telescopic rods 311. Two fourth fixing blocks 314 are provided on the outer side wall of the sleeve 310. Two sixth electric telescopic rods 313 are provided on the top side wall of the bearing plate 33. The telescopic ends of the two sixth electric telescopic rods 313 are respectively fixedly connected to the bottom ends of the two fourth fixing blocks 314. A support plate 315 is provided at the top of the sleeve 310. A positioning sensor 316 is provided on one side wall of the support plate 315.

[0025] Specifically, the fourth electric telescopic rod 38 is activated, and the two positioning plates 39 are simultaneously pushed inward until they gently contact the side wall of the detection instrument 110. The positioning sensor 316 locates the switch on the surface of the detection instrument 110. If the angle of the detection instrument 110 is deviated and the positioning sensor 316 does not correspond to the switch on the surface of the detection instrument 110, the third motor 34 is activated, driving the second gear 35 and the third gear 36 to mesh and transmit power. The second rotating plate 37 rotates slowly, and the positioning sensor 316 monitors the circumferential position of the instrument port in real time until the positioning sensor 316 aligns with the switch on the surface of the detection instrument 110, and at this time the center of the port is connected to the air transmission pipe. With the ports aligned on the same horizontal line, the third motor 34 stops operating, completing precise angle positioning. Subsequently, the fifth electric telescopic rod 311 is activated, and the two clamping plates 312 clamp the testing instrument 110 from both sides. The side of the clamping plate 312 that contacts the testing instrument 110 is made of soft silicone, completing the fixation. Then, the sixth electric telescopic rod 313 is activated, which drives the sleeve 310 to move up and down through the fourth fixing block 314, adjusting the height of the testing instrument 110 so that the height of the instrument's testing port is consistent with the interface height of the first air transmission pipe 22 and the second air transmission pipe 218, and the center is completely aligned. Subsequently, the third electric telescopic rod 31 is activated, which drives the bearing plate 33 to slowly move to the working position through the third fixing block 32.

[0026] In this embodiment, a display screen 19 is provided on one side wall of the housing 1, an adjustment plate 12 is provided at one end of the housing 1, a test air chamber 16 is provided on one side wall of the adjustment plate 12, a cleaning air chamber 15 is provided on one side wall of the adjustment plate 12, a first pressure sensor 17 is provided at one end of both the cleaning air chamber 15 and the test air chamber 16, a first air pump 111 is provided on one side wall of the adjustment plate 12, a connecting sleeve 13 is provided at one end of both the first air pump 111, the cleaning air chamber 15 and the test air chamber 16, and a detachable hose 14 is provided at the other end of the connecting sleeve 13, and a connecting pipe 18 is provided at the other end of the first air pump 111 through the adjustment plate 12.

[0027] Specifically, connect the connecting sleeve 13 at one end of the cleaning gas chamber 15 to the connecting sleeve 13 at one end of the first air pump 111 via a hose 14. Open the valve of the cleaning gas chamber 15 and run the first air pump 111 to allow nitrogen gas to enter the sealed cavity through the connecting pipe 18, the first gas transmission pipe 22, and the second gas transmission pipe 218 to remove residual impurities, moisture, and previous calibration gas from the gas path. Finally, remove these impurities by opening the one-way valve 219. After cleaning, close the valve of the first air pump 111 to stop purging. After the pressure and gas state in the cavity stabilize, close the valve of the cleaning gas chamber 15 and connect the connecting sleeve 13 at one end of the test gas chamber 16 to the connecting sleeve 13 at one end of the first air pump 111 via a hose 14. Then, open the valve of the test gas chamber 16 and simultaneously start the zero-point measurement function of the testing instrument 110 via the display screen 19.

[0028] In this embodiment, both the second gas transmission pipe 218 and the first gas transmission pipe 22 are provided with a detection mechanism 4 for gas detection at the pipe connection. The detection mechanism 4 includes a sealing shell 41 provided on the outer wall of the first gas transmission pipe 22 and the second gas transmission pipe 218. An electric sliding groove 43 is provided on the inner wall of the sealing shell 41. An electric slider 44 is slidably connected to the inner wall of the electric sliding groove 43. A gas sensor 45 is provided at one end of the electric slider 44. A second air pump 42 is provided on one side wall of the sealing shell 41. A sealing strip 46 is provided on the inner wall of the sealing shell 41.

[0029] Specifically, the second air pump 42 is started to evacuate the inside of the sealing shell 41. The second air pump 42 is then turned off and held for ten seconds. The electric slide 43 is then started, and the electric slider 44 drives the gas sensor 45 to move at a constant speed along the inner wall of the sealing shell 41 to detect whether there is a leak at the connection point. The sensor is then displayed on the screen 19.

[0030] A calibration method for a gas leak detector includes the following steps: S1: Place the testing instrument 110 stably at the center of the top of the second rotating plate 37. Activate the fourth electric telescopic rod 38, and the two positioning plates 39 will simultaneously advance inward until they gently contact the side wall of the testing instrument 110. The positioning sensor 316 will locate the switch on the surface of the testing instrument 110. If the angle of the testing instrument 110 is deviated and the positioning sensor 316 does not correspond to the switch on the surface of the testing instrument 110, the third motor 34 will be activated, driving the second gear 35 and the third gear 36 to mesh and transmit power. The second rotating plate 37 will rotate slowly, and the positioning sensor 316 will monitor the circumferential position of the instrument port in real time until the positioning sensor 316 aligns with the switch on the surface of the testing instrument 110, and at this time, the center of the port is aligned with the air transmission pipe interface. At the same horizontal line, the third motor 34 stops running, completing the precise angle positioning. Then, the fifth electric telescopic rod 311 is activated, and the two clamping plates 312 clamp the detection instrument 110 from both sides. The side of the clamping plate 312 that contacts the detection instrument 110 is made of soft silicone material, completing the fixation. Then, the sixth electric telescopic rod 313 is activated, and the sleeve 310 is moved up and down through the fourth fixing block 314 to adjust the height of the detection instrument 110 so that the height of the instrument detection port is consistent with the interface height of the first air transmission pipe 22 and the second air transmission pipe 218, and the center is completely aligned. Then, the third electric telescopic rod 31 is activated, and the bearing plate 33 is slowly moved to the working position through the third fixing block 32. S2: Start the second air pump 42 to evacuate the inside of the sealing shell 41. Turn off the second air pump 42 and maintain it for ten seconds. Start the electric slide rail 43. The electric slider 44 drives the gas sensor 45 to move at a constant speed along the inner wall of the sealing shell 41 to detect whether there is a leak at the connection. The display screen 19 will then provide a prompt. At this time, the center of the interface between the connecting pipe 18 of the first air pump 111 and the second air transmission pipe 218 is completely aligned. Then, start the second electric telescopic rod 216. The first fixing block 215 and the second fixing block 217 drive the second air transmission pipe 218 to extend and retract along the extension pipe 220, so that one end of the second air transmission pipe 218 wraps around the port of the connecting pipe 18. One end of 8 is attached to the baffle 221 to limit excessive advancement. Then, the two first electric telescopic rods 210 are activated, so that the telescopic ends drive the rollers 213 to be close to the inner wall of the instrument port and the inner wall of the connecting pipe 18 respectively. The second pressure sensor 214 provides feedback on the pressure. Then, the second motor 212 is activated to drive the rollers 213 to rotate. Through the transmission structure, the bidirectional threaded rod 26 is driven to rotate. The first step block 27 and the second step block 28 move in opposite directions along the bidirectional threaded rod 26, thereby squeezing the first air ring 23 and the second air ring 24 respectively, so that the two first air rings 23 and the two second air rings 24 are tightly attached to the inner wall of the instrument port and the connecting pipe 18 respectively, forming two seals. S3: Connect the connecting sleeve 13 at one end of the cleaning gas box 15 to the connecting sleeve 13 at one end of the first air pump 111 via the hose 14. Open the valve of the cleaning gas box 15 and run the first air pump 111 to allow nitrogen gas to enter the sealed cavity through the connecting pipe 18, the first gas transmission pipe 22, and the second gas transmission pipe 218. This removes residual impurities, moisture, and previous calibration gas from the gas path. Finally, the gas is discharged through the one-way valve 219. After cleaning, close the valve of the first air pump 111 to stop purging. After the pressure and gas state inside the cavity stabilize, close the cleaning gas box 15. The valve is opened, and the connecting sleeve 13 at one end of the test gas tank 16 is connected to the connecting sleeve 13 at one end of the first air pump 111 via the hose 14. Then, the valve of the test gas tank 16 is opened, and the zero-point measurement function of the detection instrument 110 is started through the display screen 19. The zero-point readings are collected three times in a row and recorded. The control system automatically calculates the drift value. During the collection process, the detection mechanism 4 continuously monitors the sealing status. If the gas sensor 45 does not give any leakage signal feedback, the collection is stopped immediately and the sealing test is repeated. Finally, the reset procedure is started.

[0031] It should be noted that this invention is a calibration device and method for a gas leak detector. The user transmits the information collected by the first pressure sensor 17 to the display screen 19 and checks the pressure values ​​of each test gas chamber 16 and clean gas chamber 15 to ensure sufficient pressure. Then, the detection instrument 110 is placed stably at the top center of the second rotating plate 37. The fourth electric telescopic rod 38 is activated, and the two positioning plates 39 are pushed inward synchronously until they gently fit against the side wall of the detection instrument 110. The positioning sensor 316 positions the switch on the surface of the detection instrument 110. If the angle of the detection instrument 110 is deviated and the positioning sensor 316 does not correspond to the switch on the surface of the detection instrument 110, the third motor 34 is activated to drive the second gear 35 and the third gear 36 to mesh and transmit power. The second rotating plate 37 rotates slowly, and the positioning sensor 316 monitors the circumferential position of the instrument port in real time until the positioning sensor 316... 6. The switch on the surface of the positioning detection instrument 110 is aligned with the center of the port and the air transmission pipe interface. The third motor 34 stops running, completing the precise angle positioning. Then, the fifth electric telescopic rod 311 is activated, and the two clamping plates 312 clamp the detection instrument 110 from both sides. The side of the clamping plate 312 that contacts the detection instrument 110 is made of soft silicone, completing the fixation. Then, the sixth electric telescopic rod 313 is activated, and the sleeve 310 is moved up and down through the fourth fixing block 314 to adjust the height of the detection instrument 110 so that the height of the instrument detection port is consistent with the interface height of the first air transmission pipe 22 and the second air transmission pipe 218, and the center is completely aligned. Then, the third electric telescopic rod 31 is activated, and the bearing plate 33 is slowly moved to the working position through the third fixing block 32.

[0032] At this point, the port of the testing instrument 110 is inserted into a sealed shell 41 and contacts one end of the baffle 221. The sealing strip 46 is then embedded in the groove on the surface of the port of the testing instrument 110. Next, the second air pump 42 is started to evacuate the inside of the sealed shell 41. The second air pump 42 is then turned off and held for ten seconds. The electric slide rail 43 is then started, and the electric slider 44 drives the gas sensor 45 to move at a constant speed along the inner wall of the sealed shell 41 to detect any leaks at the connection point. A warning is displayed on the screen 19. At this point, the connecting pipe 18 of the first air pump 111 is completely aligned with the center of the interface of the second air transmission pipe 218. Then, the second electric telescopic rod 216 is started, and the second air transmission pipe 218 is extended along the extension pipe 220 via the first fixing block 215 and the second fixing block 217. The second air tube 218 is compressed so that one end of the second air tube 218 wraps around the port of the connecting tube 18, and one end of the connecting tube 18 is in contact with the baffle 221 to limit excessive advancement. Then, the two first electric telescopic rods 210 are activated, so that the telescopic ends drive the rollers 213 to approach the inner wall of the instrument port and the inner wall of the connecting tube 18 respectively. The second pressure sensor 214 provides feedback on the pressure. Then, the second motor 212 is activated, which drives the rollers 213 to rotate. Through the transmission structure, the bidirectional threaded rod 26 is driven to rotate. The first step block 27 and the second step block 28 move in opposite directions along the bidirectional threaded rod 26, thereby squeezing the first air ring 23 and the second air ring 24 respectively, so that the two first air rings 23 and the two second air rings 24 are tightly in contact with the inner wall of the instrument port and the connecting tube 18 respectively, forming two seals.

[0033] Subsequently, connect the connecting sleeve 13 at one end of the cleaning gas chamber 15 to the connecting sleeve 13 at one end of the first air pump 111 via the hose 14, open the valve of the cleaning gas chamber 15, and run the first air pump 111 to allow nitrogen gas to enter the sealed cavity through the connecting pipe 18, the first gas transmission pipe 22, and the second gas transmission pipe 218, removing residual impurities, moisture, and previous calibration gas from the gas path. Finally, the gas is discharged through the one-way valve 219. After cleaning is completed, close the valve of the first air pump 111 to stop purging. After the pressure and gas state inside the cavity stabilize, close the cleaning gas chamber 15. The valve is opened, and the connecting sleeve 13 at one end of the test gas tank 16 is connected to the connecting sleeve 13 at one end of the first air pump 111 via the hose 14. Then, the valve of the test gas tank 16 is opened, and the zero-point measurement function of the detection instrument 110 is started through the display screen 19. The zero-point readings are collected three times in a row and recorded. The control system automatically calculates the drift value. During the collection process, the detection mechanism 4 continuously monitors the sealing status. If the gas sensor 45 does not give any leakage signal feedback, the collection is stopped immediately and the sealing test is repeated. Finally, the reset procedure is started.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A calibration device for a gas leak detector, comprising a housing (1), characterized in that: The bottom side wall of the box (1) is provided with a fixing mechanism (3) for fixing the detector, and the bottom of the inner side wall of the box (1) is provided with a testing mechanism (2) for conveying gas. The testing mechanism (2) includes a support frame (21) at the bottom of the inner side wall of the box (1) and a first gas transmission pipe (22) at the top of the support frame (21).

2. The gas leak detection instrument calibration device according to claim 1, characterized in that: The outer wall of the first air transmission pipe (22) has multiple holes, and the inner wall of the holes is fixedly connected to a one-way valve (219). One end of the first air transmission pipe (22) is provided with an extension pipe (220), and the other end of the extension pipe (220) is provided with a second air transmission pipe (218). The outer wall of the first air transmission pipe (22) is provided with two first fixing blocks (215), and the outer wall of the second air transmission pipe (218) is provided with two second fixing blocks (217). One end of each of the two first fixing blocks (215) is provided with a second electric telescopic rod (216), and the telescopic ends of the two second electric telescopic rods (216) are fixedly connected to one end of each of the two second fixing blocks (217).

3. The gas leak detection instrument calibration device according to claim 2, characterized in that: Both the first air transmission pipe (22) and the second air transmission pipe (218) are provided with baffles (221) on their outer walls. Both the first air transmission pipe (22) and the second air transmission pipe (218) have slots on their outer walls at one end, and a first air ring (23) is fixedly connected to the inner wall of the slot. Both the first air transmission pipe (22) and the second air transmission pipe (218) have another slot on their outer walls at one end, and a second air ring (24) is fixedly connected to the inner wall of the slot. Both the first air transmission pipe (22) and the second air transmission pipe (218) are rotatably connected with support rods (25). One end of the support rod (25) is provided with a bidirectional threaded rod (26). The outer wall of the bidirectional threaded rod (26) is provided with a second step block (28), and the outer wall of the bidirectional threaded rod (26) is provided with a first step block (27).

4. The gas leak detection instrument calibration device according to claim 3, characterized in that: The other end of the bidirectional threaded rod (26) is provided with a guide rod (29), the bottom end of the guide rod (29) is provided with a first electric telescopic rod (210), the telescopic end of the first electric telescopic rod (210) is provided with a first rotating plate (211), one end of the first rotating plate (211) is provided with a second motor (212), the output end of the second motor (212) is provided with a roller (213), and the top end of the first rotating plate (211) is provided with a second pressure sensor (214).

5. The gas leak detection instrument calibration device according to claim 1, characterized in that: The fixing mechanism (3) includes a third electric telescopic rod (31) provided on the bottom side wall of the box (1), a third fixing block (32) provided at the telescopic end of the third electric telescopic rod (31), a bearing plate (33) provided at the top of the third fixing block (32), the bearing plate (33) being slidably connected to the inner side wall of the box (1), a third motor (34) provided on the bottom side wall of the bearing plate (33), a second gear (35) provided at the output end of the third motor (34), a third gear (36) being rotatably connected to the inner side wall of the bearing plate (33), and the third gear (36) meshing with the second gear (35).

6. The gas leak detection instrument calibration device according to claim 5, characterized in that: The third gear (36) has a second rotating plate (37) on its top side wall. The top of the second rotating plate (37) is detachably connected to a testing instrument (110). The inner side wall of the second rotating plate (37) is provided with two fourth electric telescopic rods (38). The telescopic ends of the two fourth electric telescopic rods (38) are provided with positioning plates (39). The top side wall of the bearing plate (33) is provided with a sleeve (310). The bottom end of the sleeve (310) is rotatably connected to the top of the second rotating plate (37). The inner side wall of the sleeve (310) is provided with two fifth electric telescopic rods (311). The telescopic ends of the two fifth electric telescopic rods (311) are provided with clamping plates (312).

7. The gas leak detection instrument calibration device according to claim 6, characterized in that: The outer wall of the sleeve (310) is provided with two fourth fixing blocks (314), and the top side wall of the bearing plate (33) is provided with two sixth electric telescopic rods (313). The telescopic ends of the two sixth electric telescopic rods (313) are respectively fixedly connected to the bottom ends of the two fourth fixing blocks (314). The top of the sleeve (310) is provided with a support plate (315), and a positioning sensor (316) is provided on one side wall of the support plate (315).

8. The gas leak detection instrument calibration device according to claim 1, characterized in that: A display screen (19) is provided on one side wall of the housing (1). An adjustment plate (12) is provided at one end of the housing (1). A test air chamber (16) is provided on one side wall of the adjustment plate (12). A cleaning air chamber (15) is provided on one side wall of the adjustment plate (12). A first pressure sensor (17) is provided at one end of both the cleaning air chamber (15) and the test air chamber (16). A first air pump (111) is provided on one side wall of the adjustment plate (12). A connecting sleeve (13) is provided at one end of both the first air pump (111), the cleaning air chamber (15), and the test air chamber (16). A hose (14) is detachably connected to the other end of the connecting sleeve (13). A connecting pipe (18) is provided through the adjustment plate (12) at the other end of the first air pump (111).

9. A gas leak detection instrument calibration device according to claim 3, characterized in that: The outer walls of the second gas transmission pipe (218) and the first gas transmission pipe (22) are provided with a detection mechanism (4) for gas detection at the pipe connection. The detection mechanism (4) includes a sealing shell (41) provided on the outer walls of the first gas transmission pipe (22) and the second gas transmission pipe (218). The inner wall of the sealing shell (41) is provided with an electric slide groove (43). The inner wall of the electric slide groove (43) is slidably connected with an electric slider (44). One end of the electric slider (44) is provided with a gas sensor (45). A second air pump (42) is provided on one side wall of the sealing shell (41). A sealing strip (46) is provided on the inner wall of the sealing shell (41).

10. A calibration method for a gas leak detector, applied to a gas leak detector calibration device as described in any one of claims 1-9, characterized in that: Includes the following steps: S1: Place the testing instrument (110) stably at the center of the top of the second rotating plate (37), start the fourth electric telescopic rod (38), and push the two positioning plates (39) inward synchronously until they gently touch the side wall of the testing instrument (110). Position the switch on the surface of the testing instrument (110) through the positioning sensor (316). If the angle of the testing instrument (110) is deviated and the position of the switch on the surface of the testing instrument (110) is not corresponding, start the third motor (34) to drive the second gear (35) and the third gear (36) to mesh and drive. The second rotating plate (37) rotates slowly. The positioning sensor (316) monitors the circumferential position of the instrument port in real time until the position of the positioning sensor (316) corresponds to the position of the switch on the surface of the testing instrument (110). At this time, the center of the port is aligned with the air transmission pipe interface position. At the same horizontal line, the third motor (34) stops running to complete the precise angle positioning. Then, the fifth electric telescopic rod (311) is started, and the two clamping plates (312) clamp the detection instrument (110) from both sides. The side of the clamping plate (312) that contacts the detection instrument (110) is made of soft silicone material to complete the fixation. Then, the sixth electric telescopic rod (313) is started, and the sleeve (310) is moved up and down through the fourth fixing block (314) to adjust the height of the detection instrument (110) so that the instrument detection port is consistent with the interface height of the first air transmission pipe (22) and the second air transmission pipe (218) and the center is completely aligned. Then, the third electric telescopic rod (31) is started, and the bearing plate (33) is slowly moved to the working position through the third fixing block (32). S2: Start the second air pump (42) to evacuate the inside of the sealing shell (41), turn off the second air pump (42) and hold for ten seconds, start the electric slide rail (43), the electric slider (44) drives the gas sensor (45) to move at a constant speed along the inner wall of the sealing shell (41) to detect whether there is a leak at the connection, and provide a prompt on the display screen (19). At this time, the center of the interface between the connecting pipe (18) of the first air pump (111) and the interface of the second air transmission pipe (218) is completely aligned. Then, start the second electric telescopic rod (216), and drive the second air transmission pipe (218) to extend and retract along the extension pipe (220) through the first fixing block (215) and the second fixing block (217), so that one end of the second air transmission pipe (218) wraps around the port of a connecting pipe (18), and the connecting pipe One end of (18) is attached to the baffle (221) to limit excessive push-in. Then, the two first electric telescopic rods (210) are activated, so that the telescopic end drives the roller (213) to be close to the inner wall of the instrument port and the inner wall of the connecting pipe (18) respectively. The second pressure sensor (214) feeds back the pressure. Then, the second motor (212) is activated to drive the roller (213) to rotate. The transmission structure drives the bidirectional threaded rod (26) to rotate. The first step block (27) and the second step block (28) move in opposite directions along the bidirectional threaded rod (26), thereby squeezing the first air ring (23) and the second air ring (24) respectively, so that the two first air rings (23) and the two second air rings (24) are tightly attached to the inner wall of the instrument port and the connecting pipe (18) respectively, forming two seals. S3: Connect the connecting sleeve (13) at one end of the cleaning gas box (15) to the connecting sleeve (13) at one end of the first gas pump (111) through the hose (14), open the valve of the cleaning gas box (15), and run the first gas pump (111) to allow nitrogen to enter the sealed cavity through the connecting pipe (18), the first gas transmission pipe (22), and the second gas transmission pipe (218) to remove residual impurities, moisture, and previous calibration gas in the gas path. Finally, open the one-way valve (219) to remove them. After cleaning, close the valve of the first gas pump (111) to stop purging. After the pressure and gas state in the cavity are stable, close the cleaning gas box (15). 15) Connect the valve and the connecting sleeve (13) at one end of the test gas box (16) to the connecting sleeve (13) at one end of the first air pump (111) through the hose (14). Then, open the valve of the test gas box (16) and start the zero point measurement function of the detection instrument (110) through the display screen (19). Collect three zero point readings continuously and record them. The control system automatically calculates the drift value. During the collection process, the detection mechanism (4) continuously monitors the sealing status. The gas sensor (45) does not give any leakage signal feedback. If leakage occurs, stop the collection immediately and re-perform the sealing test. Finally, start the reset procedure.

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