A simple gas detector calibration device and calibration method

Abstract

The application discloses a simple gas detector calibration device and a calibration method, relates to the technical field of gas detection equipment calibration, and comprises a cover body, a calibration cabin is arranged in the cover body, and the simple gas detector calibration device further comprises: a quick-connection type mechanical connecting mechanism installed on the cover body, which is used for quick installation and replacement of a detection piece clamp; and an adjustable mechanical sealing assembly installed on the cover body, which is used for isolating the leakage of high-pressure gas to the outside, wherein the quick-connection type mechanical connecting mechanism comprises elastic buckles installed on the cover body and positioning bosses installed on the elastic buckles, the whole cover body is firmly buckled and fixed on the shell position of the gas detector by quick connection, preliminary positioning and locking of the device are completed, and the detection effect of the equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of gas detection equipment calibration technology, specifically to a simple gas detector calibration device and calibration method. Background Technology

[0002] Portable gas detectors are widely used in industrial settings such as chemical, municipal, metallurgical, and emergency safety to monitor leaks of toxic, hazardous, and flammable gases. However, due to factors such as sensor aging, environmental temperature and humidity interference, and gas poisoning, these detectors can experience zero drift and sensitivity degradation. According to metrological verification standards, closed-loop calibration using standard gases must be performed periodically to correct detection errors, ensure accurate and reliable monitoring data, and prevent safety accidents caused by inaccurate detection. Gas detectors require periodic calibration during use to ensure detection accuracy. Existing calibration devices often integrate electronic components such as pressure sensors and signal processing modules to test the sealing of the calibration cover. This results in complex structures, high costs, and susceptibility to environmental interference leading to malfunctions. Furthermore, the aging of electronic components can affect calibration reliability, making them unsuitable for on-site calibration scenarios in remote areas or without power supply.

[0003] Existing simplified calibration methods often involve wrapping the detector probe in a sealed bag, which is not only unreliable but also prone to gas leakage. This allows outside air to mix with diluted standard gas, resulting in lower detector readings, distorted calibration results, and a risk of miscalibration. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a simple gas detector calibration device, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a simplified gas detector calibration device, comprising a housing, wherein a calibration chamber is provided inside the housing, and the simplified gas detector calibration device further comprises: A quick-connect mechanical connection mechanism is installed on the cover, and the quick-connect mechanical connection mechanism is used for clamping and quickly installing and replacing the test parts; An adjustable mechanical seal assembly is installed on the cover, and the adjustable mechanical seal assembly is used to prevent the leakage of high-pressure gas from the inside to the outside.

[0006] The quick-connect mechanical connection mechanism includes an elastic buckle installed on the cover and a positioning boss installed on the elastic buckle.

[0007] The positioning boss is used to quickly align the detection end position, and the elastic buckle and the positioning boss are evenly distributed on the cover.

[0008] The adjustable mechanical seal assembly includes an annular seal groove formed on the inner side of the open end of the cover body, an elastic sealing gasket mounted on the annular seal groove, and an adjusting threaded ring mounted on the annular seal groove.

[0009] The adjusting threaded ring is in threaded connection with the open end of the cover body, and the adjusting threaded ring is in pressing contact with the elastic sealing gasket when rotating along the axial direction.

[0010] The simple gas detector calibration device further includes airflow distribution grooves formed on the inner wall of the cover body, and the airflow distribution grooves are distributed in a radial shape.

[0011] The simple gas detector calibration device further includes a safety pressure relief valve mounted on the cover body, the safety pressure relief valve is fixedly communicated with the interior of the calibration chamber, and the safety pressure relief valve is used for relieving pressure when the air pressure in the calibration chamber exceeds the standard.

[0012] The simple gas detector calibration device further includes a pagoda-type gas inlet interface welded and installed inside the closed end of the cover body, and a one-way valve installed in the gas inlet interface. The gas inlet interface is used for butting the detection end to introduce gas, the airflow distribution groove is fixedly communicated with the interior of the gas inlet interface, and the one-way valve is used for preventing gas backflow.

[0013] A paste making method for dual-power driven paste comprises the following steps: Step 1: During detection, align the open end of the calibration cover with the detection end of the gas detector, perform rapid positioning through the positioning boss, press the elastic buckle to make it buckle on the shell of the gas detector, rotate the adjusting threaded ring clockwise to squeeze the elastic sealing gasket until the sealing gasket is in close contact with the outer peripheral wall of the detection end with no loose feeling by hand. Step 2: A mechanical sealing performance test is required before detection. First, insert a nitrogen delivery pipeline equipped with a mechanical pressure gauge into the pagoda-type gas inlet interface, open the pressure reducing valve of the nitrogen cylinder, adjust the pressure to 0.18MPa, and introduce nitrogen into the calibration chamber. After the reading of the pressure gauge is stable, close the pressure reducing valve and start timing. For sealing performance judgment, maintain for 4 minutes and observe the reading of the mechanical pressure gauge. If the reading remains at 0.18MPa without dropping, the sealing performance is judged to be qualified; if the reading drops below 0.17MPa, disassemble the calibration cover to check whether the elastic sealing gasket 32 is damaged, re-buckle the elastic buckle and tighten the adjusting threaded ring, and then carry out the test. Step 3: After the sealing performance is qualified, pull out the nitrogen pipeline, connect the pipeline of the gas cylinder filled with 1000ppm carbon monoxide standard gas to the gas inlet interface, open the standard gas valve, adjust the flow rate to 1L / min, introduce the standard gas into the calibration chamber, maintain for 4 minutes until the reading of the gas detector is stable. Step 4: Record the gas detector reading as 985 ppm, the standard gas concentration as 1000 ppm, and calculate the error value as (985-1000) / 1000×100%=-1.5%. If the error value is ≤±3%, the calibration is deemed qualified. After calibration, close the standard gas valve, press the elastic buckle to release it, remove the calibration cover, and the calibration is complete.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, the entire cover is securely fastened and fixed to the outer shell of the gas detector by quick-connect fitting, thus completing the initial positioning and locking of the device and improving the detection effect of the equipment.

[0015] 2. In this invention, the operator can judge the assembly status by touch until the device is assembled securely and without any loose gaps. The sealed treatment forms a reliable calibration chamber, which provides a sealed test environment for subsequent airtightness testing and gas calibration, thereby improving the accuracy of the experiment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the position and structure of the one-way valve and calibration chamber of the present invention; Figure 3 This is a schematic diagram showing the position and structure of the elastic buckle and positioning boss of the present invention; Figure 4 This is a schematic diagram showing the position and structure of the cover and airflow diversion channel of the present invention; Figure 5 This is a schematic diagram of the location and structure of the airflow diversion channel of the present invention; Figure 6 This is a schematic diagram showing the positional structure of the elastic sealing gasket and adjusting screw ring of the present invention; Figure 7 This is a schematic diagram showing the position and structure of the annular sealing groove and the elastic sealing gasket of the present invention.

[0017] The meanings of the labels in the diagram are as follows: 1. Cover; 2. Quick-connect mechanical connection mechanism; 21. Elastic buckle; 22. Positioning boss; 3. Adjustable mechanical seal assembly; 31. Annular sealing groove; 32. Elastic sealing gasket; 33. Adjusting screw ring; 4. Airflow diversion groove; 5. Safety pressure relief valve; 6. Gas inlet port; 7. Check valve; 8. Calibration chamber. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Please see Figures 1-3 One embodiment of the present invention is: a simplified gas detector calibration device, including a housing 1, with a calibration chamber 8 inside the housing 1; the simplified gas detector calibration device further includes: The quick-connect mechanical connection mechanism 2 is installed on the cover 1. The quick-connect mechanical connection mechanism 2 is used for quick installation and replacement of the test parts by clamping them. An adjustable mechanical seal assembly 3 is installed on the cover 1. The adjustable mechanical seal assembly 3 is used to prevent high-pressure gas inside 1 from leaking outward.

[0020] The quick-connect mechanical connection mechanism 2 includes an elastic buckle 21 installed on the cover 1 and a positioning boss 22 installed on the elastic buckle 21.

[0021] The positioning boss 22 is used to quickly align the detection end position, and the elastic buckle 21 and the positioning boss 22 are evenly distributed on the cover 1.

[0022] In this embodiment, before formally calibrating the gas detector, the assembly and docking of the cover 1 and the gas detector to be tested must be completed first. The operator precisely aligns the open end of the cover 1 with the detection end of the gas detector, and uses the positioning boss 22 on the cover 1 to achieve axial quick positioning, ensuring the coaxial accuracy of the device assembly and avoiding installation misalignment. Then, the elastic buckle 21 is pressed down, and the entire cover 1 is securely fastened and fixed to the outer shell of the gas detector by the quick-connect, completing the initial positioning and locking of the device, which improves the detection effect of the equipment.

[0023] Example 2: Please see Figures 1-7 Based on the above embodiments, in another embodiment of the present invention, the adjustable mechanical seal assembly 3 includes an annular sealing groove 31 installed on the inner side of the opening end of the cover 1, an elastic sealing gasket 32 ​​installed on the annular sealing groove 31, and an adjusting screw ring 33 installed on the annular sealing groove 31.

[0024] The adjusting ring 33 is threadedly connected to the open end of the cover 1, and the adjusting ring 33 rotates axially and presses against the elastic sealing gasket 32.

[0025] The simplified gas detector calibration device also includes an airflow diversion groove 4 formed on the inner wall of the cover 1, and the airflow diversion groove 4 is formed in a radial shape.

[0026] The simplified gas detector calibration device also includes a safety relief valve 5 installed on the housing 1. The safety relief valve 5 is fixedly connected to the interior of the calibration chamber 8. The safety relief valve 5 is used to release pressure when the gas pressure in the calibration chamber 8 exceeds the standard.

[0027] The simplified gas detector calibration device also includes a pagoda-shaped gas inlet 6 welded to the closed end of the cover 1, and a one-way valve 7 installed inside the gas inlet 6. The gas inlet 6 is used to prim the detection end. The airflow diversion groove 4 is fixedly connected to the inside of the gas inlet 6. The one-way valve 7 is used to prevent gas backflow.

[0028] In this embodiment, after the initial assembly and fixation are completed, the adjusting screw ring 33 is rotated clockwise. The elastic sealing gasket 32 ​​is continuously squeezed through the threaded feed structure, allowing the elastic sealing gasket 32 ​​to fully deform and tightly fit and wrap around the outer peripheral wall of the gas detector end. The operator can judge the assembly status by touch until the device is assembled firmly and without any loose gaps. The sealing treatment forms a sealed and reliable calibration chamber 8, providing a sealed test environment for subsequent airtightness testing and gas calibration.

[0029] After the device is assembled and in place, the first step is to conduct an overall mechanical sealing test. The operator reliably connects the nitrogen supply pipeline equipped with a mechanical pressure gauge to the gas inlet port 6 of the enclosure 1, slowly opens the nitrogen cylinder pressure reducing valve, and finely adjusts the output pressure to 0.18 MPa. High-pressure nitrogen is then introduced into the sealed calibration chamber 8 through the pipeline, and inflation continues until the reading of the mechanical pressure gauge remains stable. The nitrogen cylinder pressure reducing valve is then closed to cut off the gas supply, and a 4-minute pressure holding time is started simultaneously. The pressure gauge reading changes throughout the process to verify the sealing performance of the entire assembly structure.

[0030] During the 4-minute pressure holding observation period, continuously monitor the changes in the mechanical pressure gauge reading: if the pressure gauge reading remains stable at 0.18 MPa without any drop, it indicates that the assembly seal between the cover 1 and the gas detector meets the standard, and the subsequent accuracy calibration process can proceed; if the pressure gauge reading drops to 0.17 MPa or below, it is determined that there is a gas leakage problem in the device. It is necessary to first remove the cover 1, carefully check whether the elastic sealing gasket 32 ​​is damaged, aged, or has foreign matter, investigate the cause of leakage, replace the seal, clean the assembly contact surface, and then re-assemble using the positioning boss 22, fasten the elastic buckle 21 and retighten the adjusting screw ring 33 to optimize the sealing compression, repeat the entire assembly and airtightness test process until the airtightness test is qualified.

[0031] After confirming that the airtightness of the device is completely qualified, first remove the nitrogen delivery pipeline connected to the gas inlet port 6, then connect the gas cylinder delivery pipeline of the carbon monoxide standard gas to this gas inlet port, slowly open the valve of the standard gas cylinder, and introduce the carbon monoxide standard gas into the closed calibration chamber 8 at a constant flow rate, keep the gas introduction for 4 minutes to fully replace the original air in the calibration chamber 8, wait until the displayed value of the gas detector to be tested is completely stable, so as to eliminate the data deviation caused by the non-uniform diffusion of gas concentration.

[0032] After the reading of the gas detector is stabilized, record the actually measured concentration value of the equipment, then it can be determined that the accuracy calibration result of the gas detector of this time is qualified; if the error exceeds the allowable range, it is necessary to check the influencing factors such as the tightness of the pipeline, the stability of gas flow, and the assembly state of the device, and re-conduct the airtightness test and calibration test.

[0033] After the calibration result is determined to be qualified, first close the valve of the carbon monoxide standard gas cylinder to stop the supply of the standard gas. After the gas in the calibration chamber 8 is slowly depressurized completely, press the elastic buckle 21 to unlock the quick-connect mechanical connection structure, smoothly remove the cover body 1 from the detection end of the gas detector, sort and store various test pipelines, gas cylinders and calibration tooling, so far the whole set of calibration operations for the gas detector of this time is completed.

[0034] Embodiment 3:

[0035] On the basis of Embodiment 1 and Embodiment 2, on the basis of Embodiment 1, Embodiment 2 and Embodiment 3, the dual-power-driven paste preparation method provided by this embodiment includes the following steps: Step 1: During detection, align the open end of the calibration cover with the detection end of the gas detector, perform quick positioning through the positioning boss 22, press the elastic buckle 21 to make it buckle on the shell of the gas detector, rotate the adjusting screw ring 33 clockwise to squeeze the elastic sealing gasket 32 until the sealing gasket is in close contact with the outer peripheral wall of the detection end, and there is no looseness by hand feeling; Step 2: A mechanical tightness test is required before detection. First, insert the nitrogen delivery pipeline with a mechanical pressure gauge into the pagoda-type gas inlet port 6, open the pressure reducing valve of the nitrogen cylinder, adjust the pressure to 0.18MPa, and introduce nitrogen into the calibration chamber 8. After the reading of the pressure gauge is stabilized, close the pressure reducing valve and start timing; for tightness judgment, keep for 4 minutes and observe the reading of the mechanical pressure gauge. If the reading remains at 0.18MPa without dropping, the tightness is judged to be qualified; if the reading drops below 0.17MPa, disassemble the calibration cover to check whether the elastic sealing gasket 32 is damaged, re-buckle the elastic buckle 21 and tighten the adjusting screw ring 33, and then perform the test. Step 3: After the sealing is qualified, disconnect the nitrogen line and connect the gas cylinder line containing 1000ppm carbon monoxide standard gas to the gas inlet port 6. Open the standard gas valve, adjust the flow rate to 1L / min, and introduce the standard gas into the calibration chamber 8. Maintain for 4 minutes until the gas detector reading stabilizes. Step 4: Record the gas detector reading as 985 ppm, the standard gas concentration as 1000 ppm, and calculate the error value as (985-1000) / 1000×100%=-1.5%. If the error value is ≤±3%, the calibration is deemed qualified. After calibration, close the standard gas valve, press the elastic buckle 21 to release it, remove the calibration cover, and the calibration is complete.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A simple gas detector calibration device, comprising a housing (1), wherein a calibration chamber (8) is provided inside the housing (1), characterized in that, The simplified gas detector calibration device also includes: A quick-connect mechanical connection mechanism (2) is installed on the cover (1). The quick-connect mechanical connection mechanism (2) is used for quick installation and replacement of the test piece by clamping. An adjustable mechanical seal assembly (3) is installed on the cover (1) and is used to prevent high-pressure gas inside (1) from leaking outward.

2. The simplified gas detector calibration device according to claim 1, characterized in that: The quick-connect mechanical connection mechanism (2) includes an elastic buckle (21) installed on the cover (1) and a positioning boss (22) installed on the elastic buckle (21).

3. The simplified gas detector calibration device according to claim 2, characterized in that: The positioning boss (22) is used to quickly align the detection end position, and the elastic buckle (21) and the positioning boss (22) are evenly distributed on the cover (1).

4. The simplified gas detector calibration device according to claim 1, characterized in that: The adjustable mechanical seal assembly (3) includes an annular sealing groove (31) installed inside the opening end of the cover (1), an elastic sealing gasket (32) installed on the annular sealing groove (31), and an adjusting screw ring (33) installed on the annular sealing groove (31).

5. The simplified gas detector calibration device according to claim 4, characterized in that: The adjusting screw ring (33) is threaded to the open end of the cover (1), and the adjusting screw ring (33) rotates axially and presses against the elastic sealing gasket (32).

6. The simplified gas detector calibration device according to claim 1, characterized in that: The simplified gas detector calibration device also includes an airflow diversion groove (4) formed on the inner wall of the cover (1), and the airflow diversion groove (4) is formed in a radial shape.

7. The simplified gas detector calibration device according to claim 1, characterized in that: The simplified gas detector calibration device also includes a safety relief valve (5) installed on the cover (1). The safety relief valve (5) is fixedly connected to the interior of the calibration chamber (8). The safety relief valve (5) is used to release pressure when the gas pressure in the calibration chamber (8) exceeds the standard.

8. The simplified gas detector calibration device according to claim 6, characterized in that: The simplified gas detector calibration device also includes a gas inlet port (6) welded inside the closed end of the cover (1) in the shape of a pagoda, and a one-way valve (7) installed inside the gas inlet port (6). The gas inlet port (6) is used to prime the detection end. The airflow diversion groove (4) is fixedly connected to the inside of the gas inlet port (6). The one-way valve (7) is used to prevent gas backflow.

9. The simplified gas detector calibration device and calibration method according to claim 1, wherein the simplified gas detector calibration device according to any one of claims 1-9 is characterized in that, Includes the following steps: Step 1: During testing, align the opening of the calibration cover with the detection end of the gas detector, quickly position it using the positioning boss (22), press the elastic buckle (21) to fasten it onto the gas detector housing, rotate the adjusting screw ring (33) clockwise to squeeze the elastic sealing gasket (32) until the sealing gasket is tightly fitted to the outer peripheral wall of the detection end and there is no looseness to the touch; Step 2: Before testing, a mechanical seal test is required. First, insert the nitrogen delivery pipeline with a mechanical pressure gauge into the pagoda-type gas inlet interface (6), open the nitrogen cylinder pressure reducing valve, adjust the pressure to 0.18MPa, and introduce nitrogen into the calibration chamber (8). After the pressure gauge reading stabilizes, close the pressure reducing valve and start timing. Seal judgment: Maintain for 4 minutes and observe the mechanical pressure gauge reading. If the reading remains at 0.18MPa without dropping, the seal is deemed qualified. If the reading drops below 0.17MPa, disassemble the calibration cover to check if the elastic sealing gasket (32) is damaged, re-fasten the elastic buckle (21) and tighten the adjusting screw ring (33), and then perform the test. Step 3: After the sealing is qualified, disconnect the nitrogen pipeline and connect the gas cylinder containing 1000ppm carbon monoxide standard gas to the gas inlet interface (6). Open the standard gas valve, adjust the flow rate to 1L / min, and introduce the standard gas into the calibration chamber (8). Keep it for 4 minutes until the gas detector reading is stable. Step 4: Record the gas detector reading as 985ppm, the standard gas concentration as 1000ppm, calculate the error value as (985-1000) / 1000×100%=-1.5%, the error value ≤±3%, and the calibration is deemed qualified; after calibration, close the standard gas valve, press the elastic buckle (21) to release, remove the calibration cover, and complete this calibration.

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