Automatic calibration device and method for gas detector

Abstract

The invention relates to the technical field of detection and analysis instruments, and discloses an automatic calibration device and method for a gas detector, the automatic calibration device comprises a shell, the shell is internally provided with a storage cavity and a control cavity, and the bottom of the storage cavity is fixedly provided with a plurality of standard gas steel cylinders; flow meter pressure reducers are mounted at the outlet ends of the standard gas steel cylinders in a communicating manner; an electromagnetic valve main body is mounted at the outlet end of each flow meter pressure reducer; the other end of the electromagnetic valve main body is communicated with a gas flow divider, the number of gas inlet ends of the gas flow divider is greater than or equal to the number of connected standard gas steel cylinders, each gas outlet end of the gas flow divider is connected with a gas flow meter, and gas detection equipment, an electromagnetic valve controller and upper computer software are arranged. Higher-degree automation is realized, batch calibration of a plurality of gas detection devices is supported, the system is simple in structure and convenient to operate, and meanwhile, the risk that operators are in contact with toxic and harmful gas for a long time is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of detection and analysis instruments, and more specifically to an automatic calibration device and method for a gas detector. Background Art

[0002] Gas detectors are key devices used to detect and quantify the concentration of specific gases. They play a vital role in many fields such as petrochemicals, environmental monitoring, mine safety, and laboratory safety. To ensure the measurement accuracy and reliability of gas detectors, regular instrument calibration becomes a necessary maintenance measure. The calibration process usually involves exposing the detector to a standard gas of known concentration to calibrate the relationship between the instrument's reading and the actual gas concentration.

[0003] Traditional gas detection equipment is mostly manually calibrated for a single unit, which is not only inefficient, but most gases are toxic, and long-term calibration work poses a certain risk to the safety of laboratory personnel. Secondly, the existing automatic calibration solutions and devices on the market are often accompanied by high costs and complicated operation processes, and most of them cannot achieve simultaneous calibration of multiple devices, especially composite gas detectors. Since one device is generally equipped with multiple gas sensors, the calibration process requires constant switching of gas cylinders and repeated calibration actions, making the calibration work more complicated.

[0004] In summary, traditional gas detection equipment has the disadvantages of low efficiency, long calibration time, which poses a certain risk to the safety of laboratory personnel, complex operation process, and most of them cannot realize the simultaneous calibration of multiple devices. The calibration process requires constant switching of gas cylinders and repeated calibration actions, making the calibration work more complicated. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the implementation regulations of the present invention provide an automatic calibration device and method for a gas detector to solve the technical problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic calibration device and method for a gas detector, comprising a shell, a storage chamber and a control chamber are provided inside the shell, a plurality of standard gas cylinders are fixedly installed at the bottom of the storage chamber, the outlet ends of the plurality of standard gas cylinders are connected to flow meter pressure reducers, and the outlet end of each flow meter pressure reducer is installed with a solenoid valve body; the other end of the solenoid valve body is connected to a gas diverter, the number of air inlet ends of the gas diverter is greater than or equal to the number of connected standard gas cylinders, each air outlet end of the gas diverter is connected to a gas flow meter, the other end of each of the gas flow meters is connected to a gas detection device, the number of air outlet ends of the gas diverter is greater than or equal to the number of connected gas detection devices to be calibrated, and the gas detection device is connected to a host computer software by wire or wireless means, and the host computer software can directly control the calibration action of the solenoid valve controller and the gas detection device.

[0007] In a preferred embodiment, the host computer software can set the quantity of calibration gas, and the host computer software can set different calibration times and gas path cleaning times according to different gases.

[0008] In a preferred embodiment, the solenoid valve controller can manually or automatically control the switching actions of several solenoid valve bodies connected to the gas circuit system through upper computer software, and the standard gas cylinder is a combination of multiple different types of standard compressed air cylinders, which generally includes a bottle of standard compressed air.

[0009] In a preferred embodiment, the flow meter pressure reducer is used to control the switch of the standard gas cylinder and the first layer standard gas flow control. The flow meter pressure reducer controls the gas output of the standard gas cylinder. The first layer standard gas flow is positively correlated with the number of gas detection devices required to be calibrated.

[0010] In a preferred embodiment, the gas diverter is provided with a plurality of gas inlet ends and gas outlet ends, each of the gas inlet ends or gas outlet ends has an independent switch valve for controlling the on / off state of the gas inlet end or gas outlet end, the number of the gas inlet ends is greater than or equal to the number of connected standard gas cylinders, and the number of the gas outlet ends must be greater than or equal to the number of connected devices.

[0011] In a preferred embodiment, the solenoid valve body is a switch for controlling the on-off of the gas circuit, and the solenoid valve body is a normally closed one-way valve.

[0012] In a preferred embodiment, the gas flow meter is a second-layer standard gas flow control, including but not limited to a mass flow controller or a rotor flow meter. The gas flow meter mainly controls the standard gas intake of the gas detection equipment. For pump-suction equipment, a tee is required to be added to the rear end of the gas flow meter. The apparent flow of the gas flow meter needs to be greater than the intake of the pump-suction equipment. For diffusion equipment, only the appropriate flow needs to be adjusted.

[0013] In a preferred embodiment, the method comprises the following steps:

[0014] S1: First, connect the standard gas cylinder and gas detection equipment required for calibration to the device, and connect the host computer software and solenoid valve controller;

[0015] S2: According to the actual number of gases to be calibrated and the number of gas detection devices to be calibrated at the same time, adjust the appropriate first-layer standard gas flow rate and second-layer standard gas flow rate. During batch calibration, the first-layer and second-layer standard gas flow rates only need to be adjusted once at the beginning of calibration;

[0016] S3: After the upper computer software issues the automatic calibration command, the gas detection equipment enters the calibration state, the first solenoid valve body in the automatic calibration device is opened, the first solenoid valve body is connected to the standard gas air cylinder, the gas circuit is cleaned, or zero point calibration is performed for several minutes. After the cleaning or zero point calibration is completed, the first solenoid valve body is closed, and the second solenoid valve body is opened. At this time, the gas introduced into the gas circuit is switched to the standard gas connected to the second solenoid valve body. After calibration for several minutes, the second solenoid valve body is closed, the first solenoid valve body is reopened, and compressed air is introduced to clean the gas circuit. After the cleaning is completed, switch to the third solenoid valve body and repeat the above steps;

[0017] S4: After all standard gases are calibrated, you need to manually close the flow meter pressure reducer, cut off the gas source of the standard gas cylinder, disconnect the gas detection equipment from the device, and finally manually or use the host computer software to control the solenoid valve controller to open all the solenoid valve bodies in sequence. Each solenoid valve body is opened for 10-60 seconds to relieve the pressure in the gas line and clear the residual gas to prevent the residual gas in the pipeline from affecting the next calibration.

[0018] Technical effects and advantages of the present invention:

[0019] 1. The present invention realizes a higher degree of automation by providing gas detection equipment, solenoid valve controller and host computer software, supports batch calibration of multiple gas detection equipment, has a simple system structure and convenient operation, and reduces the risk of operators being exposed to toxic and harmful gases for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic diagram of the overall structure of the automatic calibration device for gas detection equipment in the present invention;

[0021] Figure 2 A structural wireframe diagram of the automatic calibration method for gas detection equipment in the present invention;

[0022] Figure 3 It is a flow chart of the automatic calibration method of the gas detection equipment in the present invention;

[0023] Figure 4 It is a front view of the automatic calibration device of the gas detection equipment in the present invention;

[0024] Figure 5 It is a right side view of the automatic calibration device of the gas detection equipment in the present invention.

[0025] The accompanying drawings are marked as follows: 1. Standard gas cylinder; 2. Flow meter pressure reducer; 3. Solenoid valve body; 4. Gas diverter; 5. Gas flow meter; 6. Gas detection equipment; 7. Solenoid valve controller; 8. Host computer software. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative. The automatic calibration device and method of a gas detector involved in the present invention are not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] Reference Figure 1-5 The present invention provides an automatic calibration device and method for a gas detector, comprising a shell, a storage chamber and a control chamber are provided inside the shell, a plurality of standard gas cylinders 1 are fixedly installed at the bottom of the storage chamber, the outlet ends of the plurality of standard gas cylinders 1 are connected to flow meter pressure reducers 2, and the outlet end of each flow meter pressure reducer 2 is installed with a solenoid valve body 3; the other end of the solenoid valve body 3 is connected to a gas diverter 4, the number of inlet ends of the gas diverter 4 is greater than or equal to the number of connected standard gas cylinders 1, each outlet end of the gas diverter 4 is connected to a gas flow meter 5, the other end of each gas flow meter 5 is connected to a gas detection device 6, the number of outlet ends of the gas diverter 4 is greater than or equal to the number of connected gas detection devices 6 to be calibrated, the gas detection device 6 is connected to an upper computer software 8 by wire or wireless means, and the upper computer software 8 can directly control the calibration action of the solenoid valve controller 7 and the gas detection device 6.

[0028] It should be noted that: the device connects the standard gas cylinder 1 corresponding to the number of gas required for calibration of the equipment into the gas circuit. Figure 2 101, 102, 103...1n in the figure are all different standard gas cylinders 1, and the corresponding standard gas cylinders 1 are equipped with flow meter pressure reducers 201, 202, 203...2n; the end of the flow meter pressure reducer 2 is the corresponding solenoid valve body 301, 302, 303...3n; all the solenoid valve bodies 3 are finally connected to the air inlet end of the gas splitter 4, and the air inlet end of the gas splitter 4 has many air inlet ports reserved for the purpose of connecting more standard gas cylinders 1 to adapt to more different standards. Quasi-gas calibration combination, the outlet end of the gas diverter 4 also reserves multiple outlet interfaces, the number of outlet interfaces of the gas diverter 4 determines the number of gas detection devices 6 that can be calibrated simultaneously by the device, each outlet end of the gas diverter 4 is connected to a gas flow meter 501, 502, 503...5m. In this embodiment, in order to reduce the cost of the entire device, the selected gas flow meter 5 is a rotor flow meter; the other end of the gas flow meter 5 is respectively connected to the gas detection equipment 601, 602, 603...6m.

[0029] The upper computer software 8 can set the quantity of calibration gas, and the upper computer software 8 can set different calibration times and gas path cleaning times according to different gases.

[0030] What needs to be particularly explained in this embodiment is that the compressed gas in the standard gas cylinder 101 passes through the flow meter pressure reducer 201 and the solenoid valve 301 in sequence to reach the gas diverter 4, and then is evenly diverted to the gas flow meters 501, 502, 503...5m at the gas outlet end of the gas diverter 4, and finally flows into the gas detection equipment 6. The gas detection equipment 6 is a pump-suction device, and the gas flow rate passing through the gas flow meter 5 is controlled to be greater than the gas extraction volume of the gas detection equipment 6.

[0031] The solenoid valve controller 7 can manually or automatically control the switching actions of several solenoid valve bodies 3 connected to the gas circuit system through the host computer software 8. Each quasi-gas cylinder 1 is a combination of multiple different types of standard compressed air cylinders.

[0032] It should be particularly noted in this embodiment that each standard gas cylinder 1 generally contains a bottle of standard compressed air, which is used for cleaning or zero point calibration of the device gas circuit.

[0033] The flowmeter pressure reducer 2 is used to control the switch of the standard gas cylinder 1 and the first layer standard gas flow control. The flowmeter pressure reducer 2 controls the gas output of the standard gas cylinder 1. The first layer standard gas flow is positively correlated with the number of gas detection devices 6 that need to be calibrated.

[0034] What needs to be particularly explained in this embodiment is that when cleaning or zero-point calibration is performed, the compressed air in the standard gas cylinder 101 passes through the flow meter pressure reducer 201 and the solenoid valve 301 in sequence to reach the gas diverter 4, and then is evenly diverted to the gas flow meters 501, 502, 503...5m at the gas outlet end of the gas diverter 4, and finally flows into the gas detection equipment 601, 602, 603...6m to complete the cleaning or zero-point calibration.

[0035] The gas diverter 4 is provided with a plurality of inlet ends and outlet ends, each of which has an independent switch valve for controlling the on / off state of the inlet end or outlet end. The number of inlet ends is greater than or equal to the number of connected standard gas cylinders 1, and the number of outlet ends must be greater than or equal to the number of connected devices.

[0036] It should be particularly noted in this embodiment that the independent switch valves provided on the gas diverter 4 can more conveniently control the gas entering the gas inlet and gas outlet, and can be adjusted according to actual needs, so the scope of application is wider.

[0037] The solenoid valve body 3 is a switch for controlling the on-off of the gas path, and the solenoid valve body 3 is a normally closed single-way valve.

[0038] What needs to be specially explained in this embodiment is: when the cleaning process is completed, the solenoid valve body 301 is closed, the solenoid valve body 302 is opened, and the compressed gas in the standard gas cylinder 102 flows into the gas path, which lasts for 2 minutes so that all gas detection devices 6 can complete the calibration action. After the calibration action of the standard gas cylinder 102 is completed, the solenoid valve body 302 is closed, and the solenoid valve body 301 is opened for 2 minutes, and the gas path is purged with compressed air. After the purging action is completed, the above steps are repeated.

[0039] The gas flow meter 5 is the second-level standard gas flow control, including but not limited to a mass flow controller or a rotor flow meter. The gas flow meter 5 is mainly used to control the standard gas intake of the gas detection equipment 6. For pump-suction equipment, a tee is required to be added to the rear end of the gas flow meter 5. The apparent flow of the gas flow meter 5 needs to be greater than the intake of the pump-suction equipment. For diffusion equipment, only the appropriate flow needs to be adjusted.

[0040] It should be particularly noted in this embodiment that the gas flowing into the gas detection device 6 will pass through the gas flow meter 5 and the gas flow rate is controlled to be greater than the gas extraction volume of the gas detection device 6 .

[0041] The steps include:

[0042] S1: First, connect the standard gas cylinder 1 and the gas detection equipment 6 to be calibrated to the device, and connect the host computer software 8 and the solenoid valve controller 7;

[0043] S2: According to the actual amount of gas to be calibrated and the number of gas detection devices 6 to be calibrated at the same time, adjust the appropriate first-layer standard gas flow rate and second-layer standard gas flow rate. During batch calibration, the first-layer and second-layer standard gas flow rates only need to be adjusted once at the beginning of calibration;

[0044] S3: After the upper computer software 8 issues the automatic calibration instruction, the gas detection device 6 enters the calibration state, the first solenoid valve body 3 in the automatic calibration device is opened, the first solenoid valve body 3 is connected to the first standard gas cylinder 1, the gas circuit is cleaned, or zero point calibration is performed for several minutes. After the cleaning or zero point calibration is completed, the first solenoid valve body 3 is closed, and the second solenoid valve body 3 is opened. At this time, the gas introduced into the gas circuit is switched to the standard gas connected to the second solenoid valve body 3. After calibration for several minutes, the second solenoid valve body 3 is closed, the first solenoid valve body 3 is reopened, and compressed air is introduced to clean the gas circuit. After the cleaning is completed, switch to the third solenoid valve body 3 and repeat the above steps;

[0045] S4: After all standard gases are calibrated, the flow meter pressure reducer 2 needs to be manually closed, the gas source of the standard gas cylinder 1 needs to be cut off, and the connection between the gas detection equipment 6 and the device needs to be disconnected. Finally, all the solenoid valve bodies 3 need to be opened in sequence manually or by controlling the solenoid valve controller 7 with the host computer software 8. Each time a solenoid valve body 3 is opened, it needs to be maintained for 10-60 seconds to relieve the pressure in the gas circuit and clear the residual gas to prevent the residual gas in the pipeline from affecting the next calibration.

[0046] What needs to be specially explained in this embodiment is that after the upper computer software 8 issues the automatic calibration instruction, the solenoid valve controller 7 controls the solenoid valve body 301 in the automatic calibration device to open, maintain it for 2 minutes, and use compressed air to clean the gas path. In this embodiment, the gas in the standard gas cylinder 1 corresponding to the solenoid valve 301 is compressed air.

[0047] The working principle of the present invention is as follows: firstly, the standard gas cylinder 1 and the gas detection device 6 to be calibrated are connected to the device, and the upper computer software 8 and the solenoid valve controller 7 are connected;

[0048] According to the actual amount of gas to be calibrated and the number of gas detection devices 6 to be calibrated at the same time, adjust the appropriate first-layer standard gas flow rate and second-layer standard gas flow rate. During batch calibration, the first and second-layer standard gas flow rates only need to be adjusted once at the beginning of calibration;

[0049] After the upper computer software 8 issues the automatic calibration instruction, the gas detection equipment 6 enters the calibration state, the first solenoid valve body 3 in the automatic calibration device is opened, the first solenoid valve body 3 is connected to the first standard gas cylinder 1, the gas circuit is cleaned, or zero point calibration is performed for several minutes. After the cleaning or zero point calibration is completed, the first solenoid valve body 3 is closed, and the second solenoid valve body 3 is opened. At this time, the gas introduced into the gas circuit is switched to the standard gas connected to the second solenoid valve body 3. After calibration for several minutes, the second solenoid valve body 3 is closed, the first solenoid valve body 3 is reopened, and compressed air is introduced to clean the gas circuit. After the cleaning is completed, switch to the third solenoid valve body 3 and repeat the above steps;

[0050] After all standard gases are calibrated, the flow meter pressure reducer 2 needs to be manually closed, the gas source of the standard gas cylinder 1 needs to be cut off, the connection between the gas detection equipment 6 and the device needs to be disconnected, and finally all the solenoid valve bodies 3 need to be opened in sequence manually or by controlling the solenoid valve controller 7 with the host computer software 8. Each time a solenoid valve body 3 is opened, it needs to be maintained for 10-60 seconds to relieve the pressure in the gas circuit and clear the residual gas to prevent the residual gas in the pipeline from affecting the next calibration.

[0051] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An automatic calibration device for a gas detector, comprising a housing, Features: The housing is provided with a storage chamber and a control chamber. A plurality of standard gas cylinders (1) are fixedly installed at the bottom of the storage chamber. The outlet ends of the plurality of standard gas cylinders (1) are connected to flow meter pressure reducers (2), and the outlet end of each flow meter pressure reducer (2) is installed with a solenoid valve body (3). The other end of the solenoid valve body (3) is connected to a gas diverter (4). The number of inlet ends of the gas diverter (4) is greater than or equal to the number of connected standard gas cylinders (1). Each outlet end of the gas diverter (4) is connected to a gas flow meter (5). The other end of each gas flow meter (5) is connected to a gas detection device (6). The number of outlet ends of the gas diverter (4) is greater than or equal to the number of connected gas detection devices (6) to be calibrated. The gas detection device (6) is connected to a host computer software (8) via wired or wireless means. The host computer software (8) can directly control the calibration action of the solenoid valve controller (7) and the gas detection device (6).

2. The automatic calibration device for a gas detector according to claim 1, Features: The host computer software (8) can set the quantity of calibration gas, and the host computer software (8) can set different calibration times and gas path cleaning times according to different gases.

3. The automatic calibration device for a gas detector according to claim 1, Features: The solenoid valve controller (7) can manually or automatically control the switching actions of a plurality of solenoid valve bodies (3) connected to the gas circuit system through the upper computer software (8). Each of the standard gas cylinders (1) is a combination of a plurality of different types of standard compressed air cylinders, which generally contain a bottle of standard compressed air.

4. The automatic calibration device for a gas detector according to claim 1, Features: The flow meter pressure reducer (2) is used to control the switch of the standard gas cylinder (1) and the first layer standard gas flow control. The flow meter pressure reducer (2) controls the gas output of the standard gas cylinder (1). The first layer standard gas flow is positively correlated with the number of gas detection devices (6) required to be calibrated.

5. The automatic calibration device for a gas detector according to claim 1, Features: The gas diverter (4) is provided with a plurality of gas inlet ends and gas outlet ends, each of the gas inlet ends or gas outlet ends is provided with an independent switch valve for controlling the on / off state of the gas inlet end or gas outlet end, the number of the gas inlet ends is greater than or equal to the number of the connected standard gas cylinders (1), and the number of the gas outlet ends needs to be greater than or equal to the number of the connected devices.

6. The automatic calibration device for a gas detector according to claim 1, Features: The solenoid valve body (3) is a switch for controlling the on-off of the gas path, and the solenoid valve body (3) is a normally closed one-way valve.

7. The automatic calibration device for a gas detector according to claim 1, Features: The gas flow meter (5) is a second-level standard gas flow control, including but not limited to a mass flow controller or a rotor flow meter. The gas flow meter (5) is mainly used to control the standard gas intake of the gas detection device (6). For a pump-suction device, a tee is required to be added to the rear end of the gas flow meter (5). The apparent flow of the gas flow meter (5) needs to be greater than the intake of the pump-suction device. For a diffusion device, it is only necessary to adjust the appropriate flow.

8. An automatic calibration method for a gas detector, using an automatic calibration device for a gas detector as claimed in any one of claims 1 to 7. Features: The steps include: S1: First, connect the standard gas cylinder (1) and gas detection equipment (6) to be calibrated to the device, and connect the host computer software (8) and the solenoid valve controller (7); S2: according to the actual amount of gas to be calibrated and the number of gas detection devices (6) to be calibrated at the same time, adjust the appropriate first-layer calibration gas flow rate and second-layer calibration gas flow rate. During batch calibration, the first-layer and second-layer calibration gas flow rates only need to be adjusted once at the beginning of calibration; S3: After the upper computer software (8) issues an automatic calibration instruction, the gas detection device (6) enters a calibration state, the first solenoid valve body (3) in the automatic calibration device is opened, the first solenoid valve body (3) is connected to the standard gas cylinder (1), the gas circuit is cleaned, or zero point calibration is performed for several minutes. After the cleaning or zero point calibration is completed, the first solenoid valve body (3) is closed, and the second solenoid valve body (3) is opened. At this time, the gas introduced into the gas circuit is switched to the standard gas connected to the second solenoid valve body (3). After calibration for several minutes, the second solenoid valve body (3) is closed, the first solenoid valve body (3) is reopened, and compressed air is introduced to clean the gas circuit. After the cleaning is completed, the third solenoid valve body (3) is switched to repeat the above steps; S4: After all standard gases have been calibrated, the flow meter pressure reducer (2) must be manually closed, the gas source of the standard gas cylinder (1) must be cut off, the gas detection equipment (6) must be disconnected from the device, and finally, all solenoid valve bodies (3) must be opened in sequence by manually or by using the host computer software (8) to control the solenoid valve controller (7). Each solenoid valve body (3) must be opened for 10-60 seconds to relieve the pressure in the gas circuit and clear the remaining gas to prevent the remaining gas in the pipeline from affecting the next calibration.

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