CN113219134A - Gas detection device - Google Patents
Gas detection device Download PDFInfo
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- CN113219134A CN113219134A CN202110508951.XA CN202110508951A CN113219134A CN 113219134 A CN113219134 A CN 113219134A CN 202110508951 A CN202110508951 A CN 202110508951A CN 113219134 A CN113219134 A CN 113219134A
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- gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0029—General constructional details of gas analysers, e.g. portable test equipment concerning the detector cleaning
Abstract
The invention belongs to the technical field related to gas detection, and discloses a gas detection device, which comprises: a detection module in which a gas sensor is provided; the outlet of the second air suction pump is connected with the detection module, the inlet of the second air suction pump is connected with the air chamber, and the air processor is arranged in the air chamber; the detection module comprises a detection cavity and a conditioning circuit, wherein a gas sensor is arranged in the detection cavity and used for identifying gas, and the conditioning circuit is connected with the gas sensor, the first gas suction pump and the second gas suction pump. This application can realize in time carrying out the zero gas to gas sensor automatically and wash and need not artifical the participation, can place this gas detection device in any environment and carry out automated inspection, in time wash simultaneously gas sensor can protect sensitive detection device not receive gaseous corruption in the gas sensor, the improvement that is showing detection device's life.
Description
Technical Field
The invention belongs to the technical field related to gas detection, and particularly relates to a gas detection device.
Background
Generally, there are two main sampling methods for gas detection devices: diffusion sampling or pump-suction sampling. The diffusion type sampling speed is low, and the application field is greatly limited. Therefore, in many field rapid detection fields, a pumping type sampling mode is used, and the working principle of the pumping type sampling is that a power supply drives an air pump to extract and sample air in a region to be detected, and then the sample air is sent to an instrument for detection, so that the sampling device can be used for measuring a short-distance region or a long-distance region. The zero gas is standard carrier gas, and the zero gas is introduced to enable the gas sensor to obtain a zero concentration standard. However, when a pumping type sampling mode is used for measuring a remote area, the existing zero gas generating device cannot process environmental gas in a targeted manner, so that the existing zero gas is peripheral equipment, for example, a high-pressure gas cylinder can be used for supplying gas, but when long-time online detection is carried out, the gas supply quantity of the high-pressure gas cylinder is insufficient, the price is high, the molecular sieve, silica gel and other adsorbents can be used for filtering and purifying the environmental air to obtain dry and clean air carrier gas, and meanwhile, the problem of replacement of the adsorbents also exists. The external zero gas equipment cannot be integrated with the gas detector, so that toxic environment must be sampled, the sampling is detected, and the labor steps and the detection accuracy are increased, so that the gas detection equipment is directly placed in the detection environment to be detected in the most effective mode, but the monitoring instrument needs to be cleaned and reset manually, and people are very dangerous in the toxic environment; among the traditional pumping formula sampling device, remaining gas that awaits measuring all need get rid of through the sensor cavity in the pipeline, and consequently too far away makes the response and the recovery time of sensor longer, and gas detection device is also very sensitive to gaseous corruption on the sensor, and current zero gas transmission is all through manual control, can not in time wash gas detector, leads to gas detector's life greatly reduced, needs often to change gas detector.
Disclosure of Invention
In view of the above drawbacks and needs of the prior art, the present invention provides a gas detection apparatus, in which a second getter pump is connected to a gas processor having a plurality of array units, and different processing materials are disposed on the plurality of array units, so that various environmental gases can be processed, and the apparatus can be applied to processing gases in different environments, and further can be disposed in the same environment as a detection module, so that the apparatus has a simpler and more compact structure, and the detection module can be cleaned in time to detect the next gas. On the other hand, the gas detection device can be suitable for detecting various different gases after the gas processor is matched, and the application field is greatly expanded.
To achieve the above object, according to one aspect of the present invention, there is provided a gas detection apparatus, including: the gas detection device comprises a detection module 2, a gas sensor is arranged in the detection module 2, and a first gas inlet 1 and a first air suction pump 3 are arranged on the detection module 2; the first air suction pump 3 is operated to suck air from the first air inlet 1 into the detection module 2 for identification; the exit linkage of second aspirator pump 5 detection module 2, the access connection air chamber 6 of second aspirator pump 5, be equipped with gaseous treater 8 in the air chamber 6, gaseous treater 8 includes a plurality of zonulae occludens 'array unit, and a plurality of array units set up different processing materials, the second aspirator pump 5 during operation will pass through the gas after 6 processing of air chamber is as zero gas input detection module 2 is in order to realize right detection module's washing.
Preferably, the detection module 2 includes a detection chamber and a conditioning circuit, a gas sensor is disposed in the detection chamber and used for identifying gas, and the conditioning circuit is connected to the gas sensor, the first getter pump 3 and the second getter pump 5 and used for outputting an identification result of the gas sensor and controlling the first getter pump 3 and the second getter pump 5 to operate.
Preferably, the gas processor 8 divides the gas chamber 6 into a first chamber and a second chamber through a sealing ring, the second chamber is connected with the second getter pump 5, and the gas in the first chamber enters the second chamber after being purified by the gas processor 8.
Preferably, a heating module and an illumination module are further arranged in the first cavity.
Preferably, the heating module comprises a plurality of heating units, and the heating units are connected with the array units in a one-to-one correspondence manner.
Preferably, the gas handler (8) is removably connected to the sealing ring.
Preferably, the gas sensor is a micro-MEMS array, and different array units are coated with different gas-sensitive materials.
Generally, compared with the prior art, the gas detection device provided by the invention has the following beneficial effects:
1. gas sensor, first aspirator pump and second aspirator pump all are connected with conditioning circuit in this application, conditioning circuit control three's working order, can realize in time carrying out the zero gas to gas sensor automatically and wash and need not artifical the participation, and then can place this gaseous detection device and carry out automated inspection in any environment, in time wash simultaneously to gas sensor can protect sensitive detection device not receive gaseous corruption in the gas sensor, the improvement that is showing detection device's life.
2. The first air suction pump sucks detection gas and the second air suction pump sucks zero gas to divide work, the traveling path of the gas to be detected is shortened, the gas to be detected is sucked into the sensor cavity by the first air suction pump and then is discharged out of the sensor cavity in the reverse direction of the original pipeline by the second air suction pump, short interaction time of the detection gas and the gas sensor is shortened, and detection time is remarkably shortened.
3. The utility model provides a second aspirator pump connects gaseous treater, set up a plurality of zonulae occludens's array unit in the gaseous processing, a plurality of array units set up different processing materials, can handle the gas under the different environmental condition, and then can be in the same place the second aspirator pump with the gas chamber that has gaseous treater and the design that detection module is compact, the structure is very simple, can be applicable to the detection ring border of various complicacies, need not to connect complicated zero gas generating device in addition, economic benefits and industrial application value that have showing.
4. The utility model provides a connection can be dismantled to gas sensor, can in time change material wherein to the detection ring border atmosphere of difference, and then realizes that pertinence is handled and is obtained the zero gas of standard to still be provided with heating module and illumination module in the gas chamber, with the cooperation of gas treater and then can carry out timely high-efficient processing to various environment gas, satisfy the demand of a large amount of zero gas when wasing detection module.
Drawings
FIG. 1 is a schematic view showing a gas detection apparatus of the present embodiment;
FIG. 2 schematically shows a schematic view of another gas detection apparatus of the present embodiment;
fig. 3 schematically shows a structural diagram of the detection module of the present embodiment.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-a first gas inlet; 2-a detection module; 3-a first aspirator pump; 4-a waste gas recovery unit; 5-a second getter pump; 6-air chamber; 7-a second suction opening; 8-gas processor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and 2, the present invention provides a gas detection apparatus, which includes a first gas inlet 1, a detection module 2, a first getter pump 3, a second getter pump 5, a gas chamber 6, and a gas processor 8.
As shown in fig. 3, the detection module 2 includes a gas sensor, a conditioning circuit, and a detection chamber. The detection cavity is preferably a metal cavity, and the gas sensor is arranged in the detection cavity and used for identifying gas in the detection cavity. The gas sensor is preferably an array type gas sensor, and is further preferably a micro MEMS array, the gas sensor can be coated with gas sensitive materials by micro-spraying, silk-screen printing or other processes to realize response to different gases, and appropriate sensor materials can be selected according to components to be detected in the detection cavity to further improve detection accuracy. The conditioning circuit is highly integrated, can control the gas sensor, and can identify, store, condition, output and the like the response signal of the gas sensor to the gas.
The air inlet end of the first air suction pump 3 is connected with the detection module 2, the first air suction pump 3 provides driving force for the gas to be detected to enter the detection cavity, and the gas to be detected is sucked into the detection module 2 through the first gas inlet 1 during operation.
An exhaust gas recovery device 4 can be further arranged at the outlet of the first air suction pump 3 and used for recovering the detected exhaust gas.
The exit linkage of second aspirator pump 5 detection module 2, the access connection air chamber 6 of second aspirator pump 5, be equipped with gaseous treater 8 in the air chamber 6, gaseous treater 8 includes a plurality of zonulae occludens 'array unit, and a plurality of array units set up different processing materials, the second aspirator pump 5 during operation will pass through the gaseous input after the air chamber 6 is handled detection module 2 is in order to realize right detection module's washing.
Gas treater 8 will through the sealing washer gas chamber 6 divides into first cavity and second cavity, the second cavity with second aspirator pump 5 is connected, and the gaseous passing through of first cavity gas treater 8 purifies the back and gets into the second cavity, and first cavity is equipped with second suction port mouth 7.
And a heating module and an illumination module are also arranged in the first cavity. The heating module comprises a plurality of heating units, the heating units are connected with the array units in a one-to-one correspondence mode, and the illumination module can emit light waves of any frequency to accelerate the reaction on the gas processor 8 and meet the requirement on gas purification flow.
Gas treater 8 with the sealing washer can be dismantled and is connected, can set up different gas treater, convenient and fast according to the pending environmental atmosphere that treats that can not. Can connect through the screw thread between first cavity and the second cavity, and then can part both when more air treater, make things convenient for gas treater 8's change.
The gas processor 8 is a special material or device having a special processing function for gas molecules to be detected, and can perform certain characteristic processing on the gas molecules to be detected passing through the gas processor 8 through physical or chemical properties, so that the processed mixed gas does not contain or contains few gas molecules to be detected, and the processed gas can be used as zero gas.
When the gas sensor and the gas processor are in work, firstly, the proper gas sensor and the proper gas processor are selected according to the detected gas, and the gas sensor and the gas processor are installed; and then, the second air suction pump is turned on, the gas sensor works, ambient atmosphere enters the detection cavity as zero gas after being processed by the gas processor, the sensor works in a zero atmosphere to obtain a baseline resistance, the second air suction pump is turned off after the working baseline resistance of the gas sensor is stabilized, the first air suction pump is turned on to introduce gas to be detected, the gas sensor starts to respond, the second air suction pump is turned on again after the response resistance is stabilized, the first air suction pump is turned off, the response of the gas sensor is recovered, data and an analysis result are stored after the resistance is stabilized, and the processes are controlled by a conditioning circuit.
In the embodiment, when the atmosphere in the outer closed box body is sampled and detected in a long distance, according to the sampling operation of the sampling method, after the gas-sensitive response of the array type gas sensor to the atmosphere to be sampled is stable, the second getter pump 5 is turned on, ambient air (containing no molecules to be detected) is sucked into the gas chamber 6 and finally enters the detection cavity to be used as zero gas to clean the atmosphere to be detected in the detection cavity. Compared with the mode that zero gas is additionally arranged to clean the atmosphere in the detection cavity from the long sampling pipe → the first gas inlet 1 → the detection cavity, the ambient air sucked by the second suction pump 5 enters the detection cavity from the second suction port 7 to clean the atmosphere in the detection cavity, the operation is simpler, the zero gas walking path is greatly shortened, and the sensor can recover response more quickly so as to enter the next test state more quickly.
Example 1
In this example, the gas processor 8 is selected as a 1% Pt-supported TiO2 catalyst, which has a formaldehyde catalytic efficiency of 99% or more at 200 ℃; the gas sensor is selected from In modified by metal Ho2O3The gas-sensitive material has good selectivity to formaldehyde. Starting according to the sampling methodSampling, after the gas sensor has responded steadily in an atmosphere containing formaldehyde components, the second getter pump 5 is operated, and the atmosphere containing formaldehyde molecules passes through the gas processor 8 (1% Pt-loaded TiO)2Catalyst) catalytic decomposition to CO2Ho modified In2O3Gas sensor pair CO2And the gas after treatment is used as zero gas to clean the detection cavity, so that the zero gas does not need to be additionally arranged, the operation procedure is greatly simplified, and the application range is expanded.
Example 2
In this example, the gas processor 8 was replaced with an inorganic molecular sieve SAPO-34 membrane having a SAPO-34 membrane pore size of
Less than the kinetic diameter of ammonia molecule
To be larger than the hydrogen kinetic diameter
Therefore, when the mixed gas of ammonia and hydrogen is detected, the gas processor (the molecular sieve SAPO-34 membrane) can sieve the mixed gas, so that the sieved gas contains few ammonia molecules and reaches the detection limit of the array type gas sensor. The array type gas sensor is SnO2Sensor, the gas sensitive material is on NH3And H2Has good gas-sensitive response. In the embodiment, when the mixed gas containing ammonia and hydrogen is sampled and detected, firstly, when the air suction port is connected to a zero-gas pipeline, the air suction pump 3 and the array type sensor work, after the array type sensor is stable under the zero atmosphere, the pipeline connected to the zero gas is taken down, then, the air suction pump 3 continues to suck the mixed gas, the array type gas sensor generates response, after the response is stable, the air suction pump 3 is closed, the expiration pump 5 is opened, the mixed gas enters the gas chamber 6 from the expiration port 7, when the mixed gas passes through the gas processor 8 (inorganic molecular sieve SAPO-34 membrane), ammonia molecules are sieved and trapped, and the ammonia molecules are sieved and trapped, so that the ammonia molecules are trappedThe gas hardly contains or contains few ammonia molecules, and then is sent into the detection cavity, response differences are formed between response signals of the screened gas and original response signals, and detection of ammonia and hydrogen concentration is realized through data processing and analysis.
In conclusion, this application gas sensor, first aspirator pump and second aspirator pump all are connected with conditioning circuit, and conditioning circuit control three's working order can realize in time carrying out the zero gas to gas sensor and wash and need not artifical the participation automatically, and then can place this gaseous detection device in any environment and carry out automated inspection, and the while is in time washd gas sensor and can protect sensitive detection device not receive gaseous corruption in the gas sensor, the improvement that is showing detection device's life.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A gas detection apparatus, characterized in that the gas detection apparatus comprises:
the gas detection device comprises a detection module (2), a gas sensor is arranged in the detection module (2), and a first gas inlet (1) and a first air suction pump (3) are arranged on the detection module (2); when the first air suction pump (3) works, air is sucked into the detection module (2) from the first air inlet (1) for identification;
an outlet of the second air suction pump (5) is connected with the detection module (2), an inlet of the second air suction pump (5) is connected with the air chamber (6), a gas processor (8) is arranged in the air chamber (6), and when the second air suction pump (5) works, gas processed by the air chamber (6) is input into the detection module (2) as zero gas to realize cleaning of the detection module;
the detection module (2) comprises a detection cavity and a conditioning circuit, wherein a gas sensor is arranged in the detection cavity and used for identifying gas, and the conditioning circuit is connected with the gas sensor, the first gas suction pump (3) and the second gas suction pump (5) and used for storing or outputting an identification result of the gas sensor and controlling the first gas suction pump (3) and the second gas suction pump (5) to work.
2. The gas detection apparatus according to claim 1, wherein the gas handler (8) divides the gas chamber (6) into a first chamber and a second chamber by a sealing ring, the second chamber is connected to the second getter pump (5), and the gas in the first chamber enters the second chamber after being purified by the gas handler (8).
3. The gas detection apparatus of claim 2, wherein a heating module and an illumination module are further disposed within the first chamber.
4. A gas detection apparatus according to claim 3, wherein the gas processor (8) comprises a plurality of closely coupled array units, the plurality of array units being provided with different process materials.
5. The gas detection apparatus according to claim 4, wherein the heating module includes a plurality of heating units, and the heating units are connected to the array units in a one-to-one correspondence.
6. A gas detection apparatus according to claim 3, wherein the gas handler (8) is removably connected to the sealing ring.
7. The gas detection apparatus of claim 6, wherein the first chamber and the second chamber are threadably connected.
8. The gas detection apparatus of claim 1, wherein the gas sensor is a micro-MEMS array, and different array elements are coated with different gas sensitive materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110508951.XA CN113219134A (en) | 2021-05-11 | 2021-05-11 | Gas detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110508951.XA CN113219134A (en) | 2021-05-11 | 2021-05-11 | Gas detection device |
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| CN113219134A true CN113219134A (en) | 2021-08-06 |
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| CN202110508951.XA Pending CN113219134A (en) | 2021-05-11 | 2021-05-11 | Gas detection device |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204832136U (en) * | 2015-06-23 | 2015-12-02 | 上海宁和环境科技发展有限公司 | Gaseous detection device of online zero correction environment |
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| CN108982765A (en) * | 2018-07-03 | 2018-12-11 | 深圳智人环保科技有限公司 | Minitype gas detection system and method with temperature and humidity pretreatment and benchmark zeroing |
| CN109507249A (en) * | 2018-12-20 | 2019-03-22 | 汉威科技集团股份有限公司 | A kind of new gas detector with self-cleaning function |
| CN112183611A (en) * | 2020-09-23 | 2021-01-05 | 中国农业大学 | Gas sensor signal fusion optimization system and method |
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2021
- 2021-05-11 CN CN202110508951.XA patent/CN113219134A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204832136U (en) * | 2015-06-23 | 2015-12-02 | 上海宁和环境科技发展有限公司 | Gaseous detection device of online zero correction environment |
| CN205175984U (en) * | 2015-10-30 | 2016-04-20 | 河南汉威电子股份有限公司 | Area is from cleaning function's continuous tracer gas detector |
| CN105445158A (en) * | 2016-01-04 | 2016-03-30 | 南京逸然电子科技有限公司 | High-accuracy real-time online detecting instrument for atmospheric pollution |
| CN205786530U (en) * | 2016-05-17 | 2016-12-07 | 南京更佳电子科技有限公司 | A kind of gas concentration detection apparatus |
| CN108120798A (en) * | 2016-11-28 | 2018-06-05 | 艾欧史密斯(中国)热水器有限公司 | Sensor device, air purifier and gas measuring method |
| CN108982765A (en) * | 2018-07-03 | 2018-12-11 | 深圳智人环保科技有限公司 | Minitype gas detection system and method with temperature and humidity pretreatment and benchmark zeroing |
| CN109507249A (en) * | 2018-12-20 | 2019-03-22 | 汉威科技集团股份有限公司 | A kind of new gas detector with self-cleaning function |
| CN112183611A (en) * | 2020-09-23 | 2021-01-05 | 中国农业大学 | Gas sensor signal fusion optimization system and method |
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Application publication date: 20210806 |