Calibration device and calibration method for gas detector

Abstract

The invention belongs to the technical field of gas detector calibration, and particularly relates to a calibration device and a calibration method for a gas detector, the calibration device is used for calibrating a gas detector main body, the calibration device comprises a base, a round box is fixedly mounted at the top of the base, and a gas distribution mechanism is arranged in the round box; the gas distribution mechanism divides the interior of the round box into four gas distribution cavities, different quantities of detection gas and dilution gas are injected into the four gas distribution cavities, so that four different types and different concentrations of reference gas are mixed in the four gas distribution cavities, and four placement mechanisms are fixedly mounted on the outer side of the round box. According to the invention, detection and calibration of four detection gases can be carried out on the gas detector main body in sequence, in the process, the position of the gas detector main body does not need to be manually and frequently changed, and detection and calibration can be simultaneously carried out on the four gas detector main bodies, so that traditional redundant calibration steps are omitted, and the calibration efficiency can be effectively improved.

Description

Technical Field

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

[0002] A gas detector is an instrument and tool for detecting gas leakage concentration, mainly using 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 gases. In the prior art, a single sampling detector is used to sample and detect multiple different types of gases. The commonly detected gases are four types (specifically oxygen, H2S, CO, and combustible gas). For example, a patent with the patent number 201821819590.0 discloses a four-in-one function gas detector that can detect four different types of gases.

[0003] However, for the above-mentioned similar four-in-one gas detectors, calibration is required before leaving the factory and after being used for a period of time. The common calibration method is to detect a detection gas with a standard concentration through the instrument, and judge whether the detection result of the instrument is accurate by observing the gas concentration detected by the instrument and comparing it with the standard concentration of the detection gas. In the prior art, since four different types of gases need to be detected, the conventional one-to-one calibration method is inefficient, and when detecting different concentrations of the same gas, more standard concentration detection gases need to be purchased. Therefore, a calibration device and a calibration method for a gas detector are proposed. Summary of the Invention

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

[0005] To achieve the above object, the present invention adopts the following technical solution: A calibration device for a gas detector, used to calibrate a gas detector main body, includes a base. A round box is fixedly installed on the top of the base. A gas distribution mechanism is arranged inside the round box. The gas distribution mechanism divides the interior of the round box into four gas distribution chambers. Different amounts of detection gas and dilution gas are injected into the four gas distribution chambers, so that four different types and different concentrations of reference gases are mixed in the four gas distribution chambers. Four placement mechanisms are fixedly installed on the outer side of the round box. A mixing component for accelerating the mixing of the detection gas and the dilution gas is arranged in the gas distribution chamber. When the gas distribution mechanism rotates intermittently in the round box, the positions of the four gas distribution chambers are intermittently changed and simultaneously communicated with the corresponding placement mechanisms. When the gas detector main body is fixed in the placement mechanism, the four gas distribution chambers with intermittently changed positions can be used to calibrate and detect the gas detector main body with four reference gases.

[0006] Preferably, the air distribution mechanism is fixedly installed on two circular blocks on the inner walls of both sides of the circular box. Circular plates are rotatably installed on one side of the two circular blocks close to each other. A circular shaft is fixedly installed between the two circular plates. Four partition plates distributed in a circumferential array are fixedly installed on the side surface of the circular shaft. The side of the partition plate away from the circular shaft is slidably connected to the inner wall of the circular box. The circular plate is rotatably connected to the inner wall of the circular box. Both sides of the circular shaft are fixedly connected to the corresponding circular plates respectively. Four air distribution chambers are formed by the four partition plates, the two circular plates and the side surface of the circular box.

[0007] Preferably, four air inlet holes are opened on the circular plate. The four air inlet holes are respectively communicated with the corresponding air distribution chambers. Four annular grooves with different diameters are opened on the side of the circular block close to the circular plate. The four annular grooves are coaxially arranged, and the four annular grooves are respectively communicated with the corresponding air inlet holes on the circular plate.

[0008] Preferably, four conduits distributed linearly are fixedly installed on the side of the circular shaft away from the circular plate. The four conduits penetrate through the circular block and the circular box and are fixedly connected to the circular block and the circular box respectively, and the four conduits are respectively communicated with the corresponding annular grooves. The air distribution mechanism further includes motors fixedly installed on both sides of the circular box. The output shaft of the motor rotatably penetrates through the side wall of the circular box and the circular block and is fixedly connected to the circular plate.

[0009] Preferably, flow meters I are arranged on the four conduits on one side, and a gas distributor is installed on the four conduits on the other side. A flow meter II is installed on the inlet pipe of the gas distributor.

[0010] Preferably, the placing mechanism includes an elbow pipe penetrating through the circular box and fixedly connected to the circular box. A placing hopper is fixedly installed at one end of the elbow pipe away from the circular box. An exhaust valve is fixedly installed at one end of the placing hopper away from the circular box. The placing hopper is communicated with the inside of the circular box through the elbow pipe. Two fixing plates are fixedly installed on the side surface of the circular box. The two placing hoppers on the same side are fixedly connected to the adjacent same fixing plate.

[0011] Preferably, the mixing assembly includes two driving mechanisms fixedly installed on the side of the two circular plates close to each other. The driving mechanism includes a connecting plate fixedly connected to the circular plate. A first rotating shaft and a second rotating shaft are rotatably installed on the connecting plate. An elastic roller and a large gear are fixedly sleeved on the first rotating shaft. The elastic roller is in close contact with the inner wall of the circular box. A small gear is fixedly sleeved on the second rotating shaft. The large gear and the small gear are meshed and connected. A same stirring shaft is fixedly installed between the two second rotating shafts of the two driving mechanisms.

[0012] A calibration method for a gas detector, applicable to the above-mentioned calibration device for a gas detector, includes the following steps: S1: Inject the dilution gas into the four gas distribution chambers simultaneously, and inject the four types of detection gases into the four gas distribution chambers respectively, so that the detection gases and the dilution gas form reference gases of different types and different concentrations in the four gas distribution chambers; S2: Insert the gas detector main body to be calibrated and detected into the placement mechanism. During the intermittent replacement of the positions of the four gas distribution chambers, the four types of reference gases will calibrate and detect the gas detector main body in the placement mechanism in sequence.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention can detect and calibrate the four types of detection gases for the gas detector main body in sequence. During this process, there is no need for manual frequent adjustment of the position of the gas detector main body, and the four gas detector main bodies can be detected and calibrated simultaneously, saving the traditional cumbersome calibration steps and effectively improving the calibration efficiency; 2. The present invention can also match the four types of detection gases with different concentrations with the dilution gas, and can proportion detection gases with different concentrations and different types. Only one type of standard gas and dilution gas with the same concentration need to be purchased, which can effectively save the cost required for calibration. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of a calibration device for a gas detector proposed by the present invention; Figure 2 It is a schematic diagram of the overall side sectional view of a calibration device for a gas detector proposed by the present invention; Figure 3 It is a schematic diagram of the partial side sectional view of a calibration device for a gas detector proposed by the present invention; Figure 4 It is a schematic diagram of the partial structure of the gas distribution mechanism in a calibration device for a gas detector proposed by the present invention Figure 1 ; Figure 5 It is a schematic diagram of the partial structure of the gas distribution mechanism in a calibration device for a gas detector proposed by the present invention Figure 2 ; Figure 6 It is a schematic diagram of the structure of the mixing component in a calibration device for a gas detector proposed by the present invention; Figure 7 It is a schematic diagram of the working state when the calibration device for a gas detector proposed by the present invention detects the gas detector main body.

[0015] In the figure: 1. Base; 11. Fixed plate; 2. Circular box; 3. Gas distribution mechanism; 31. Circular plate; 311. Air inlet hole; 32. Circular shaft; 33. Partition board; 34. Gas distribution chamber; 35. Circular block; 351. Annular groove; 36. Motor; 37. Conduit; 4. Placing mechanism; 41. Elbow pipe; 42. Placing hopper; 43. Exhaust valve; 5. Mixing component; 51. Driving mechanism; 511. Connecting plate; 512. First rotating shaft; 513. Elastic roller; 514. Large gear; 515. Second rotating shaft; 516. Small gear; 52. Stirring shaft; 6. First flowmeter; 7. Gas distributor; 8. Second flowmeter; 9. Main body of gas detector. Detailed implementation mode

[0016] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0017] Please refer to Figures 1-7 , the present invention provides a technical solution: a calibration device for a gas detector, which is used to calibrate the main body 9 of the gas detector. The sampling port of the main body 9 of the gas detector is located at the top of the device. It includes a base 1, a circular box 2 is fixedly installed on the top of the base 1, a gas distribution mechanism 3 is arranged in the circular box 2, and the gas distribution mechanism 3 divides the interior of the circular box 2 into four gas distribution chambers 34. Different amounts of detection gases and dilution gases are injected into the four gas distribution chambers 34 to mix four different types and different concentrations of reference gases in the four gas distribution chambers 34. Four placing mechanisms 4 are fixedly installed on the outer side of the circular box 2, and a mixing component 5 for accelerating the mixing of the detection gas and the dilution gas is arranged in the gas distribution chamber 34. When the gas distribution mechanism 3 rotates intermittently in the circular box 2, the positions of the four gas distribution chambers 34 are intermittently changed and are simultaneously connected to the corresponding placing mechanisms 4. When the main body 9 of the gas detector is fixed in the placing mechanism 4, the four gas distribution chambers 34 with intermittently changed positions can be used to calibrate and detect the main body 9 of the gas detector with four reference gases.

[0018] Further, the rotation angle of each of the four gas distribution chambers 34 each time is 90°. The four detection gases are CH4, CO, O2, and H2S respectively, and the dilution gas is N2 with the highest content in the air. The four detection gases and the dilution gas are all stored in corresponding compressed gas cylinders, and the purity of each is 99.99%.

[0019] The gas distribution mechanism 3 is fixedly installed on two circular blocks 35 on the inner walls of both sides of the circular box 2. On one side of the two circular blocks 35 close to each other, circular plates 31 are rotatably installed. A circular shaft 32 is fixedly installed between the two circular plates 31. Four partition plates 33 distributed in a circumferential array are fixedly installed on the side surface of the circular shaft 32. The side of the partition plate 33 away from the circular shaft 32 is slidably 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. Four gas distribution chambers 34 are formed by the four partition plates 33, the two circular plates 31 and the side surface of the circular box 2.

[0020] Four air inlet holes 311 are formed in the circular plate 31. The four air inlet holes 311 are respectively communicated with the corresponding gas distribution chambers 34. Four annular grooves 351 with different diameters are formed on one side of the circular block 35 close to the circular plate 31. The four annular grooves 351 are coaxially arranged, and the four annular grooves 351 are respectively communicated with the corresponding air inlet holes 311 on the circular plate 31.

[0021] Four conduits 37 distributed linearly are fixedly installed on the side of the circular shaft 32 away from the circular plate 31. The four conduits 37 all penetrate 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 communicated with the corresponding annular grooves 351. The gas distribution mechanism 3 further includes motors 36 fixedly installed on both sides of the circular box 2. The output shafts of the motors 36 rotatably penetrate through the side walls of the circular box 2 and the circular blocks 35 and are fixedly connected to the circular plates 31.

[0022] Furthermore, after the gas enters the four conduits 37, the gas will enter the four annular grooves 351 respectively. Then the gas enters the four gas distribution chambers 34 respectively through the four air inlet holes 311 communicated with 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 also always the same. And when the motor 36 drives the circular plate 31 to rotate, each air inlet hole 311 is always in a communicating state with the corresponding annular groove 351.

[0023] Flow meters one 6 are provided on the four conduits 37 on one side. A gas distributor 7 is installed on the four conduits 37 on the other side. A flow meter two 8 is installed on the intake pipe of the gas distributor 7.

[0024] Furthermore, the flow meter two 8 adopts a one - to - four type, specifically one intake pipe and four outlet pipes. The four outlet pipes are respectively connected to the corresponding conduits 37.

[0025] The placing mechanism 4 includes an elbow pipe 41 that penetrates through the circular box 2 and is fixedly connected to the circular box 2. One end of the elbow pipe 41 away from the circular box 2 is fixedly installed with a placing hopper 42. One end of the placing hopper 42 away from the circular box 2 is fixedly installed with an exhaust valve 43. The placing hopper 42 is connected to the inside of the circular box 2 through the elbow pipe 41. Two fixing plates 11 are fixedly installed on the side of the circular box 2. The two placing hoppers 42 on the same side are fixedly connected to the same adjacent fixing plate 11.

[0026] Further, the conduit 37 equipped with the flowmeter one 6 is connected by a pipeline between the compressed gas cylinders storing the detection gas. By observing the data on the flowmeter one 6, the quantity of the detection gas entering the gas distribution chamber 34 can be checked. Then, by connecting the compressed gas cylinders storing the dilution gas to the inlet pipe of the flowmeter two 8 through a pipeline, and by observing the data on the flowmeter two 8 and dividing the data on the flowmeter two 8 by 4, the quantity of the dilution gas entering the gas distribution chamber 34 can be obtained. After that, by dividing the quantity of the detection gas in the gas distribution chamber 34 by (the quantity of the detection gas + the quantity of the dilution gas), the concentration of the reference gas in the gas distribution chamber 34 can be obtained. During each detection process, the quantity of the reference gas discharged through the exhaust valve 43 in 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 entering the gas distribution chamber 34 subsequently is the same as the concentration of the original reference gas in the gas distribution chamber 34. In the above process, only the quantities of the detection gas and the dilution gas entering the gas distribution chamber 34 need to be limited.

[0027] The mixing component 5 includes two driving mechanisms 51 fixedly installed on the sides 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 first rotating shaft 512 and a second rotating shaft 515 are rotatably installed on the connecting plate 511. An elastic roller 513 and a large gear 514 are fixedly sleeved on the first rotating shaft 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 second rotating shaft 515. The large gear 514 and the small gear 516 are meshed and connected. A same stirring shaft 52 is fixedly installed between the two second rotating shafts 515 of the two driving mechanisms 51.

[0028] 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 rollers 513 abutted against the inner wall of the circular box 2 revolve around the circular shaft 32, due to the action of friction, the elastic rollers 513 will also rotate simultaneously. The rotating elastic rollers 513 will drive the large gear 514 to rotate through the first rotating shaft 512, the large gear 514 will drive the small gear 516 to rotate, and the small gear 516 will drive the stirring shaft 52 to rotate through the second rotating shaft 515. The rotating stirring shaft 52 will stir the dilution gas and the detection gas in the air distribution chamber 34 to be fully and evenly mixed. Moreover, since the gear ratio between the large gear 514 and the small gear 516 is n:1 (where n is an integer and n>1), therefore, when the large gear 514 rotates one circle, it can drive the small gear 516 to rotate multiple circles. Thus, during the intermittent rotation of the four air distribution chambers 34, each stirring shaft 52 can rotate quickly, so that the dilution gas and the detection gas in the air distribution chamber 34 are fully and evenly mixed.

[0029] A calibration method for a gas detector, applicable to the above-mentioned calibration device for a gas detector, includes the following steps: S1: Inject the dilution gas into the four air distribution chambers 34 simultaneously, and inject four kinds of detection gases into the four air distribution chambers 34 respectively, so that the detection gas and the dilution gas form reference gases of different types and different concentrations in the four air distribution chambers 34; S2: Insert the gas detector main body 9 to be calibrated and detected into the placement mechanism 4. During the intermittent replacement of the positions of the four air distribution chambers 34, the four kinds of reference gases will sequentially calibrate and detect the gas detector main body 9 in the placement mechanism 4.

[0030] In this embodiment: Compressed gas cylinders storing four kinds of detection gases are respectively connected to the four conduits 37 each equipped with a first flowmeter 6 through pipelines, and then the compressed gas cylinder storing the dilution gas is connected to the intake pipe of the gas distributor 7 through a pipeline; First, inject the same amount of dilution gas into the four air distribution chambers 34. During this process, open the exhaust valves 43 on the four placement mechanisms 4. The residual air originally in the air distribution chambers 34 will be pushed out by the injected dilution gas from the connected elbow pipes 41, so that only the dilution gas is contained in the air distribution chambers 34 at this time, and then close the exhaust valves 43 on the placement mechanisms 4; Subsequently, inject different amounts and different kinds of detection gases into the four air distribution chambers 34. At this time, the detection gas and the dilution gas in the air distribution chambers 34 will be mixed in the air distribution chambers 34 to form reference gases of different concentrations; When calibrating the gas detector main body 9, insert the gas detector main body 9 into the corresponding placement hopper 42, and make the sampling port of the gas detector main body 9 face the exhaust valve 43. During the detection and calibration process, the reference gas in the gas distribution chamber 34 will be discharged to the intake port of the gas detector main body 9 through the opened exhaust valve 43. By observing the comparison between the concentration of the reference gas detected on the gas detector main body 9 and the concentration of the reference gas in the gas distribution chamber 34, if the detection result of the gas detector main body 9 is not standard, the problematic gas detector main body 9 can be stored separately; Then, adjust each parameter on the problematic gas detector main body 9, and then detect the gas detector main body 9 again after the parameter adjustment. When the detection result of the concentration of the reference gas discharged from the gas distribution chamber 34 by the gas detector main body 9 is almost the same as the concentration of the reference gas in the gas distribution chamber 34, the calibration of the gas detector main body 9 is completed.

[0031] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A calibration device for a gas detector, used 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 arranged in the round box (2). The gas distribution mechanism (3) divides the inside of the round box (2) into four gas distribution chambers (34). Different amounts of detection gas and dilution gas are injected 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 assembly (5) for accelerating the mixing of the detection gas and the dilution gas is arranged 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) whose positions are intermittently changed can be used to calibrate and detect the four reference gases on the gas detector body (9).

2. A calibration device for a gas detector according to claim 1, characterized in that: The gas distribution mechanism (3) is fixedly mounted on two round blocks (35) on the inner walls of both sides of the round 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 circular 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 round box (2); the round plate (31) is rotatably connected to the inner wall of the round 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 the four partitions (33), the two round plates (31) and the side of the round box (2).

3. A calibration device for a gas detector according to claim 2, characterized in that: The circular plate (31) is provided with four air inlet holes (311), the four air inlet holes (311) are respectively connected to corresponding air distribution chambers (34), and 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 corresponding air inlet holes (311) on the circular plate (31).

4. A calibration device for a gas detector according to claim 3, characterized in that: 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); and the four conduits (37) are respectively connected to corresponding annular grooves (351); the valve mechanism (3) further comprises a motor (36) fixedly mounted on both sides of the circular box (2); an output shaft of the motor (36) rotates to penetrate the side wall of the circular box (2) and the circular block (35) and is fixedly connected to the circular plate (31).

5. A calibration device for a gas detector according to claim 4, 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).

6. A calibration device for a gas detector according to claim 1, characterized in that: The placement mechanism (4) comprises a curved pipe (41) penetrating the round box (2) and fixedly connected to the round box (2); a placement bucket (42) is fixedly mounted on one end of the curved pipe (41) away from the round box (2); an exhaust valve (43) is fixedly mounted on one 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) via the curved pipe (41); two fixed plates (11) are fixedly mounted 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).

7. A calibration device for a gas detector according to claim 2, characterized in that: The mixing assembly (5) comprises two driving mechanisms (51) fixedly mounted on one side of two circular plates (31) close to each other, the driving mechanisms (51) comprising a connecting plate (511) fixedly connected to the circular plates (31), a first rotating shaft (512) and a second rotating shaft (515) being rotatably mounted on the connecting plate (511), an elastic roller (513) and a large gear (514) being fixedly sleeved on the first 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 sleeved on the second rotating shaft (515), the large gear (514) and the small gear (516) being meshingly connected, and a common stirring shaft (52) being fixedly mounted between the two second rotating shafts (515) on the two driving mechanisms (51).

8. A calibration method for a gas detector, applicable to a calibration device for a gas detector in claim 1, characterized in that: The following steps are involved: S1: injecting a dilution gas into four gas distribution chambers (34) at the same time, and injecting four detection gases into the four gas distribution chambers (34) respectively, so that the detection gas and the dilution gas form reference gases of different types and concentrations in the four gas distribution chambers (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 perform calibration tests on the gas detector body (9) in the placement mechanism (4) in turn.

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