Calibration device and calibration method for gas detector

Abstract

The present invention belongs to the field of gas detector calibration technology, and in particular, it relates to a calibration device and calibration method for a gas detector, which is used to calibrate the main body of the gas detector, and includes a base, a round box is fixedly installed on the top of the base, a gas distribution mechanism is provided in the round box, the gas distribution mechanism divides the interior of the round box into four gas distribution chambers, and injects different amounts of detection gas and dilution gas into the four gas distribution chambers to mix four different types and concentrations of reference gas in the four gas distribution chambers, and four placement mechanisms are fixedly installed on the outside of the round box. The present invention can perform detection and calibration of four detection gases on the main body of the gas detector in turn. During this process, there is no need to manually change the position of the main body of the gas detector frequently, and the four main bodies of the gas detector can be detected and calibrated at the same time, eliminating the traditional tedious calibration steps and effectively improving the calibration efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detector calibration, and in particular to a calibration device and a calibration method for a gas detector. Background Art

[0002] A gas detector is an instrument tool for detecting gas leakage concentration. It mainly uses a gas sensor to detect the types of gases present in the environment. A gas sensor is a sensor used to detect the composition and content of a gas. In the existing technology, a single sampling detector is used to sample and detect multiple different types of gases. There are four common gases that need to be detected (specifically oxygen, H2S, CO, and combustible gases). For example, patent number 201821819590.0 discloses a four-in-one gas detector that can detect four different types of gases.

[0003] However, similar four-in-one gas detectors as mentioned above need to be calibrated before leaving the factory and after being used for a period of time. The common calibration method is to use the instrument to detect the detection gas of standard concentration, and to judge whether the detection result of the instrument is accurate by comparing the gas concentration detected by the observation instrument with the standard concentration of the detection gas. In the existing technology, since four different types of gases need to be detected, the conventional one-to-one calibration method is less efficient, and when detecting different concentrations of the same gas, more standard concentration detection gases need to be purchased. For this reason, a calibration device and calibration method for a gas detector are proposed. Summary of the Invention

[0004] In order to solve the shortcomings of the prior art, the present invention proposes a calibration device and a calibration method for a gas detector.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a calibration device for a gas detector, which is used to calibrate the main body of the gas detector, comprising a base, a round box fixedly installed on the top of the base, a gas distribution mechanism provided in the round box, the gas distribution mechanism divides the interior of the round box into four gas distribution chambers, and injects different amounts of detection gas and dilution gas into the four gas distribution chambers to mix four different types and concentrations of reference gases in the four gas distribution chambers. Four placement mechanisms are fixedly installed on the outside of the round box, and a mixing component for accelerating the mixing of detection gas and dilution gas is provided in the gas distribution chamber. When the gas distribution mechanism intermittently rotates in the round box, the positions of the four gas distribution chambers are intermittently changed and are simultaneously connected to the corresponding placement mechanisms. When the gas detector main body is fixed in the placement mechanism, the four gas distribution chambers that intermittently change their positions can be used to calibrate the gas detector main body with four reference gases.

[0006] Preferably, the gas distribution mechanism is fixedly mounted on two round blocks on the inner walls on both sides of the circular box, and a round plate is rotatably mounted on the side of the two round blocks that are close to each other, and a round shaft is fixedly mounted between the two round plates, and four partitions distributed in a circular array are fixedly mounted on the side of the round shaft, and the side of the partition away from the round shaft is slidingly connected to the inner wall of the circular box, and the round plate is rotatably connected to the inner wall of the circular box, and the two sides of the circular shaft are respectively fixedly connected to the corresponding round plates, and the four gas distribution chambers are composed of four partitions, two round plates and the side of the circular box.

[0007] Preferably, the circular plate is provided with four air inlet holes, which are respectively connected to the corresponding air distribution chambers; the circular block is provided with four annular grooves of different diameters on one side close to the circular plate, the four annular grooves are coaxially arranged, and the four annular grooves are respectively connected to the corresponding air inlet holes on the circular plate.

[0008] Preferably, four linearly distributed conduits are fixedly installed on the side of the circular shaft away from the circular plate. The four conduits all pass through the circular block and the circular box and are fixedly connected to the circular block and the circular box, and the four conduits are respectively connected to the corresponding annular grooves. The valve mechanism also includes a motor fixedly installed on both sides of the circular box, and the output shaft of the motor rotates through the side wall of the circular box and the circular block and is fixedly connected to the circular plate.

[0009] Preferably, the four conduits on one side are each provided with a flow meter 1, and the four conduits on the other side are installed with a same gas distributor, and the air inlet pipe of the gas distributor is installed with a flow meter 2.

[0010] Preferably, the placement mechanism includes a curved pipe that passes through the round box and is fixedly connected to the round box, a placement bucket is fixedly installed on the end of the curved pipe away from the round box, an exhaust valve is fixedly installed on the end of the placement bucket away from the round box, the placement bucket is connected to the interior of the round box through the curved pipe, two fixed plates are fixedly installed on the side of the round box, and the two placement buckets on the same side are fixedly connected to the same adjacent fixed plate.

[0011] Preferably, the mixing assembly includes two driving mechanisms fixedly mounted on one side of two circular plates close to each other, the driving mechanism including a connecting plate fixedly connected to the circular plate, a rotating shaft 1 and a rotating shaft 2 being rotatably mounted on the connecting plate, an elastic roller and a large gear being fixedly sleeved on the rotating shaft 1, the elastic roller being in close contact with the inner wall of the circular box, a small gear being fixedly sleeved on the rotating shaft 2, the large gear and the small gear being meshed with each other, and the same stirring shaft being fixedly mounted between the two rotating shafts 2 on the two driving mechanisms.

[0012] A calibration method for a gas detector, applicable to the above-mentioned calibration device for a gas detector, comprises the following steps:

[0013] S1: Inject the dilution gas into the four gas distribution cavities at the same time, and inject the four detection gases into the four gas distribution cavities respectively, so that the detection gas and the dilution gas form reference gases of different types and concentrations in the four gas distribution cavities;

[0014] S2: Insert the main body of the gas detector to be calibrated and tested into the placement mechanism. During the intermittent replacement of the positions of the four gas distribution chambers, the four reference gases will calibrate and test the main body of the gas detector in the placement mechanism in turn.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention can sequentially perform detection and calibration of four detection gases on the gas detector body. During this process, there is no need to manually frequently change the position of the gas detector body, and the four gas detector bodies can be detected and calibrated simultaneously, eliminating the traditional tedious calibration steps and effectively improving the calibration efficiency.

[0017] 2. The present invention can also match dilution gases with four different concentrations of detection gases, and can mix detection gases of different concentrations and types. It is only necessary to purchase standard gases and dilution gases of the same concentration, which can effectively save the cost required for calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure of a calibration device for a gas detector proposed by the present invention;

[0019] Figure 2 This is an overall side sectional view of a calibration device for a gas detector proposed by the present invention;

[0020] Figure 3 A partial side sectional view of a calibration device for a gas detector proposed by the present invention;

[0021] Figure 4 This is a schematic diagram of the partial structure of the gas distribution mechanism in the calibration device for gas detectors proposed by the present invention. Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the partial structure of the gas distribution mechanism in the calibration device for gas detectors proposed by the present invention. Figure 2 ;

[0023] Figure 6 This is a schematic structural diagram of a mixing component in a calibration device for a gas detector proposed by the present invention;

[0024] Figure 7 The figure shows the working of a calibration device for a gas detector proposed by the present invention when detecting a main body of a gas detector.

[0025] In the figure: 1. Base; 11. Fixed plate; 2. Round box; 3. Gas distribution mechanism; 31. Round plate; 311. Air inlet; 32. Round shaft; 33. Partition; 34. Gas distribution chamber; 35. Round block; 351. Annular groove; 36. Motor; 37. Conduit; 4. Placement mechanism; 41. Bend pipe; 42. Placement bucket; 43. Exhaust valve; 5. Mixing component; 51. Driving mechanism; 511. Connecting plate; 512. Rotating shaft 1; 513. Elastic roller; 514. Big gear; 515. Rotating shaft 2; 516. Small gear; 52. Stirring shaft; 6. Flowmeter 1; 7. Gas distributor; 8. Flowmeter 2; 9. Gas detector body. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] Please refer to Figure 1-Figure 7 The present invention provides a technical solution: a calibration device for a gas detector, which is used to calibrate a gas detector main body 9. The sampling port of the gas detector main body 9 is located at the top of the device, including a base 1, a round box 2 is fixedly installed on the top of the base 1, and a gas distribution mechanism 3 is provided in the round box 2. The gas distribution mechanism 3 divides the interior of the round box 2 into four gas distribution chambers 34, and injects different amounts of detection gas and dilution gas into the four gas distribution chambers 34, so that four different types and concentrations of reference gases are mixed in the four gas distribution chambers 34. Four placement mechanisms 4 are fixedly installed on the outside of the round box 2, and a mixing component 5 for accelerating the mixing of detection gas and dilution gas is provided in the gas distribution chamber 34. When the gas distribution mechanism 3 rotates intermittently in the round box 2, the positions of the four gas distribution chambers 34 are intermittently changed and are simultaneously connected to the corresponding placement mechanisms 4. When the gas detector main body 9 is fixed in the placement mechanism 4, the four gas distribution chambers 34 that intermittently change their positions can be used to calibrate the gas detector main body 9 with four reference gases.

[0028] Furthermore, the four gas distribution chambers 34 rotate 90 degrees each time. The four detection gases are CH4, CO, O2, and H2S, and the dilution gas is N2, which has the highest content in the air. The four detection gases and dilution gas are all stored in corresponding compressed gas cylinders, and the purity is 99.99%.

[0029] The gas distribution mechanism 3 is fixedly mounted on two round blocks 35 on the inner walls of both sides of the circular box 2. A circular plate 31 is rotatably mounted on the side of the two round blocks 35 that are close to each other. A round shaft 32 is fixedly mounted between the two circular plates 31. Four partitions 33 distributed in a circular array are fixedly mounted on the side of the circular shaft 32. The side of the partition 33 away from the circular shaft 32 is slidingly connected to the inner wall of the circular box 2. The circular plate 31 is rotatably connected to the inner wall of the circular box 2. The two sides of the circular shaft 32 are fixedly connected to the corresponding circular plates 31 respectively. The four gas distribution chambers 34 are composed of four partitions 33, two circular plates 31 and the side of the circular box 2.

[0030] Four air inlet holes 311 are provided on the circular plate 31, and the four air inlet holes 311 are respectively connected to the corresponding air distribution chambers 34. Four annular grooves 351 of different diameters are provided on the side of the circular block 35 close to the circular plate 31. The four annular grooves 351 are coaxially arranged and respectively connected to the corresponding air inlet holes 311 on the circular plate 31.

[0031] Four linearly distributed conduits 37 are fixedly installed on the side of the circular shaft 32 away from the circular plate 31. The four conduits 37 all pass through the circular block 35 and the circular box 2 and are fixedly connected to the circular block 35 and the circular box 2, and the four conduits 37 are respectively connected to the corresponding annular grooves 351. The gas distribution mechanism 3 also includes a motor 36 fixedly installed on both sides of the circular box 2. The output shaft of the motor 36 rotates and passes through the side wall of the circular box 2 and the circular block 35 and is fixedly connected to the circular plate 31.

[0032] Furthermore, after the gas enters the four conduits 37, the gas will enter the four annular grooves 351 respectively, and then enter the four gas distribution chambers 34 respectively through the four air inlet holes 311 connected to the four annular grooves 351. Therefore, as long as the amount of gas entering the four conduits 37 is the same, it can be ensured that the amount of gas entering the four gas distribution chambers 34 is always the same, and when the motor 36 drives the circular plate 31 to rotate, each air inlet hole 311 is always in a connected state with the corresponding annular groove 351.

[0033] The four conduits 37 on one side are each provided with a flow meter 1 6 , and the four conduits 37 on the other side are each provided with a same gas distributor 7 , and the air inlet pipe of the gas distributor 7 is provided with a flow meter 2 8 .

[0034] Furthermore, the flow meter 2 8 adopts a one-to-four type, specifically one air inlet pipe and four air outlet pipes, and the four air outlet pipes are respectively connected to the corresponding conduits 37.

[0035] The placement mechanism 4 includes a curved pipe 41 that passes through the round box 2 and is fixedly connected to the round box 2. A placement bucket 42 is fixedly installed on the end of the curved pipe 41 away from the round box 2. An exhaust valve 43 is fixedly installed on the end of the placement bucket 42 away from the round box 2. The placement bucket 42 is connected to the interior of the round box 2 through the curved pipe 41. Two fixed plates 11 are fixedly installed on the side of the round box 2. The two placement buckets 42 on the same side are fixedly connected to the same adjacent fixed plate 11.

[0036] Furthermore, the conduit 37 equipped with the flow meter 1 6 is connected to the compressed gas cylinder storing the test gas through a pipe. By observing the data on the flow meter 1 6, the amount of test gas entering the gas distribution chamber 34 can be checked. Then, by connecting the compressed gas cylinder storing the dilution gas to the inlet pipe of the flow meter 2 8 through a pipe, by observing the data on the flow meter 2 8 and dividing the data on the flow meter 2 8 by 4, the amount of dilution gas entering the gas distribution chamber 34 can be obtained. Then, by dividing the amount of test gas in the gas distribution chamber 34 by (the amount of test gas + the amount of dilution gas), the concentration of the reference gas in the gas distribution chamber 34 can be obtained.

[0037] During each detection process, the amount of reference gas discharged from the exhaust valve 43 through the exhaust valve 43 is a rated constant. It is necessary to ensure that the mixed concentration of the dilution gas and the detection gas subsequently entering the gas distribution chamber 34 is consistent with the original reference gas concentration in the gas distribution chamber 34. In the above process, it is only necessary to limit the amount of detection gas and dilution gas entering the gas distribution chamber 34.

[0038] The mixing assembly 5 includes two driving mechanisms 51 fixedly mounted on one side of the two circular plates 31 close to each other. The driving mechanism 51 includes a connecting plate 511 fixedly connected to the circular plate 31. A rotating shaft 1 512 and a rotating shaft 2 515 are rotatably mounted on the connecting plate 511. An elastic roller 513 and a large gear 514 are fixedly sleeved on the rotating shaft 1 512. The elastic roller 513 is in close contact with the inner wall of the circular box 2. A small gear 516 is fixedly sleeved on the rotating shaft 2 515. The large gear 514 and the small gear 516 are meshed and connected. The same stirring shaft 52 is fixedly mounted between the two rotating shafts 2 515 on the two driving mechanisms 51.

[0039] Furthermore, during the rotation of the two circular plates 31, the multiple mixing components 5 will revolve around the circular shaft 32. When the elastic roller 513 abutting the inner wall of the circular box 2 revolves around the circular shaft 32, due to the action of friction, the elastic roller 513 will also rotate at the same time. The rotating elastic roller 513 will drive the large gear 514 to rotate through the rotating shaft 1 512, and the large gear 514 will then drive the small gear 516 to rotate. The small gear 516 will then drive the stirring shaft 52 to rotate through the rotating shaft 2 515. The rotating stirring shaft 52 will stir the dilution gas and the detection gas in the gas distribution chamber 34 to fully and evenly mix. Since the gear ratio between the large gear 514 and the small gear 516 is n:1 (where n is an integer and n is greater than 1), one rotation of the large gear 514 can drive the small gear 516 to rotate multiple times. Therefore, during the intermittent rotation of the four gas distribution chambers 34, each stirring shaft 52 can rotate rapidly, so that the dilution gas and the detection gas in the gas distribution chamber 34 are fully and evenly mixed.

[0040] A calibration method for a gas detector, applicable to the above-mentioned calibration device for a gas detector, comprises the following steps:

[0041] S1: injecting dilution gas into the four gas distribution cavities 34 simultaneously, and injecting four detection gases into the four gas distribution cavities 34 respectively, so that the detection gas and dilution gas form reference gases of different types and concentrations in the four gas distribution cavities 34;

[0042] S2: Insert the gas detector body 9 to be calibrated and tested into the placement mechanism 4. During the intermittent replacement of the positions of the four gas distribution cavities 34, the four reference gases will calibrate and test the gas detector body 9 in the placement mechanism 4 in turn.

[0043] In this embodiment, compressed gas cylinders storing four types of test gases are connected to four conduits 37 each equipped with a flow meter 6 through pipelines, and then a compressed gas cylinder storing a dilution gas is connected to the air inlet pipe of the gas distributor 7 through pipelines.

[0044] First, an equal amount of dilution gas is injected into the four air distribution chambers 34. During this process, the exhaust valves 43 on the four placement mechanisms 4 are opened. The residual air in the air distribution chambers 34 is pushed out from the connected elbows 41 by the injected dilution gas, so that the air distribution chambers 34 now contain only the dilution gas. Then, the exhaust valves 43 on the placement mechanisms 4 are closed.

[0045] Then, different amounts and types of test gases are injected into the four gas distribution cavities 34 respectively. At this time, the test gas and the dilution gas in the gas distribution cavity 34 will mix in the gas distribution cavity 34 to form reference gases of different concentrations;

[0046] When testing and calibrating the gas detector body 9, the gas detector body 9 is inserted into the corresponding placement bucket 42, and the sampling port of the gas detector body 9 is directed toward the exhaust valve 43. During the testing and calibration process, the reference gas in the gas distribution chamber 34 is discharged to the air inlet of the gas detector body 9 through the opened exhaust valve 43. By observing the reference gas concentration detected on the gas detector body 9 and comparing it with the reference gas concentration in the gas distribution chamber 34, if the test result of the gas detector body 9 is not standard, the problematic gas detector body 9 can be stored separately.

[0047] Afterwards, the various parameters on the problematic gas detector body 9 are adjusted, and the gas detector body 9 after parameter adjustment is tested again. When the reference gas concentration detection result discharged from the gas distribution chamber 34 by the gas detector body 9 is almost the same as the reference gas concentration in the gas distribution chamber 34, the calibration of the gas detector body 9 is completed.

[0048] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A calibration device for a gas detector, for calibrating a gas detector body (9), comprising a base (1), characterized in that: A round box (2) is fixedly mounted on the top of the base (1), and a gas distribution mechanism (3) is provided in the round box (2). The gas distribution mechanism (3) divides the inside of the round box (2) into four gas distribution chambers (34), and injects different amounts of detection gas and dilution gas into the four gas distribution chambers (34), so that four different types and concentrations of reference gases are mixed in the four gas distribution chambers (34). Four placement mechanisms (4) are fixedly mounted on the outside of the round box (2), and a mixing component (5) for accelerating the mixing of the detection gas and the dilution gas is provided in the gas distribution chamber (34). When the gas distribution mechanism (3) rotates intermittently in the round box (2), the positions of the four gas distribution chambers (34) are intermittently changed and are simultaneously connected to the corresponding placement mechanisms (4). When the gas detector body (9) is fixed in the placement mechanism (4), the four gas distribution chambers (34) that have their positions intermittently changed can be used to calibrate and detect the four reference gases on the gas detector body (9); The gas distribution mechanism (3) is fixedly mounted on two round blocks (35) on the inner walls of both sides of the circular box (2); a round plate (31) is rotatably mounted on the sides of the two round blocks (35) that are close to each other; a round shaft (32) is fixedly mounted between the two round plates (31); four partitions (33) distributed in a circumferential array are fixedly mounted on the side of the round shaft (32); the side of the partition (33) away from the round shaft (32) is slidably connected to the inner wall of the circular box (2); the round plate (31) is rotatably connected to the inner wall of the circular box (2); the two sides of the round shaft (32) are respectively fixedly connected to the corresponding round plates (31); and the four gas distribution chambers (34) are composed of four partitions (33), two round plates (31) and the side of the circular box (2); The circular plate (31) is provided with four air inlet holes (311), and the four air inlet holes (311) are respectively connected to the corresponding air distribution chambers (34); the circular block (35) is provided with four annular grooves (351) of different diameters on one side close to the circular plate (31); the four annular grooves (351) are coaxially arranged, and the four annular grooves (351) are respectively connected to the corresponding air inlet holes (311) on the circular plate (31); Four conduits (37) distributed linearly are fixedly mounted on one side of the circular shaft (32) away from the circular plate (31). The four conduits (37) all penetrate the circular block (35) and the circular box (2) and are fixedly connected to the circular block (35) and the circular box (2). The four conduits (37) are respectively connected to the corresponding annular grooves (351). The gas distribution mechanism (3) further includes a motor (36) fixedly mounted on both sides of the circular box (2). The output shaft of the motor (36) rotates and penetrates the side wall of the circular box (2) and the circular block (35) and is fixedly connected to the circular plate (31). The placement mechanism (4) includes a curved pipe (41) that passes through the round box (2) and is fixedly connected to the round box (2); a placement bucket (42) is fixedly installed at one end of the curved pipe (41) away from the round box (2); an exhaust valve (43) is fixedly installed at one end of the placement bucket (42) away from the round box (2); the placement bucket (42) is communicated with the interior of the round box (2) through the curved pipe (41); two fixed plates (11) are fixedly installed on the side of the round box (2); and the two placement buckets (42) on the same side are fixedly connected to the same adjacent fixed plate (11).

2. A calibration device for a gas detector according to claim 1, characterized in that: The four conduits (37) on one side are each provided with a flow meter 1 (6), and the four conduits (37) on the other side are provided with a same gas distributor (7), and the air inlet pipe of the gas distributor (7) is provided with a flow meter 2 (8).

3. A calibration device for a gas detector according to claim 1, characterized in that: The mixing assembly (5) includes two driving mechanisms (51) fixedly mounted on one side of two circular plates (31) close to each other, the driving mechanism (51) including a connecting plate (511) fixedly connected to the circular plate (31), a rotating shaft (512) and a rotating shaft (515) being rotatably mounted on the connecting plate (511), an elastic roller (513) and a large gear (514) being fixedly mounted on the rotating shaft (512), the elastic roller (513) being in close contact with the inner wall of the circular box (2), a small gear (516) being fixedly mounted on the rotating shaft (515), the large gear (514) and the small gear (516) being meshed and connected, and a common stirring shaft (52) being fixedly mounted between the two rotating shafts (515) on the two driving mechanisms (51).

4. A calibration method for a gas detector, applicable to the calibration device for a gas detector according to claim 1, characterized in that: The following steps are involved: S1: injecting dilution gas into the four gas distribution cavities (34) at the same time, and injecting four detection gases into the four gas distribution cavities (34) respectively, so that the detection gas and the dilution gas form reference gases of different types and concentrations in the four gas distribution cavities (34); S2: The gas detector body (9) to be calibrated and tested is inserted into the placement mechanism (4). During the intermittent replacement of the positions of the four gas distribution chambers (34), the four reference gases will calibrate and test the gas detector body (9) in the placement mechanism (4) in turn.

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