CN109932490B - Gas pretreatment device with back-pumping function and gas detection device - Google Patents
Gas pretreatment device with back-pumping function and gas detection device Download PDFInfo
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- CN109932490B CN109932490B CN201910214426.XA CN201910214426A CN109932490B CN 109932490 B CN109932490 B CN 109932490B CN 201910214426 A CN201910214426 A CN 201910214426A CN 109932490 B CN109932490 B CN 109932490B
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- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 238000005086 pumping Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 14
- 238000010790 dilution Methods 0.000 claims description 27
- 239000012895 dilution Substances 0.000 claims description 27
- 238000007865 diluting Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 51
- 238000000034 method Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 6
- 239000010865 sewage Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000012306 spectroscopic technique Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The invention provides a gas pretreatment device with a back pumping function and a gas detection device, comprising: the device comprises an oil-water separator, a particle filter, a three-way valve I, a three-way valve II, a three-way joint I, an air pump, a flowmeter I, a pressure gauge, a two-way valve, a switch I, a switch II, a switch V and a switch VI; the oil-water separator, the particle filter, the three-way valve I, the air pump, the three-way valve II, the three-way joint I, the flowmeter I, the pressure gauge and the two-way valve are sequentially connected to form a passage, and the switch I, the switch II, the switch V and the switch VI respectively control the three-way valve I, the three-way valve II, the air pump and the two-way valve. The invention provides stable flowing, constant temperature and constant pressure, dry and clean gas for the following detection equipment, greatly improves the reliability of gas test results and prolongs the service life of the gas detection equipment.
Description
Technical Field
The invention relates to the field of gas detection, in particular to a gas pretreatment device with a back-pumping function and a gas detection device.
Background
For gas detection devices used in various industries, for example, for detecting components of automobile exhaust by means of infrared spectroscopic techniques, the presence of water vapor during detection has a certain influence on the accuracy of the test. In addition, because of the existence of particulate matters such as soot, dust and the like in the water vapor and the automobile exhaust, various detection devices can be polluted and damaged, and the service life of the detection devices is reduced. In addition, the instability of the values such as the gas flow rate, the gas temperature, the gas pressure and the like also brings certain errors to the test results.
Disclosure of Invention
Aiming at the problems, the design aims to develop a gas pretreatment device with a back-pumping function and a gas detection device.
The invention provides a gas pretreatment device with a back pumping function and a gas detection device, comprising: the device comprises an oil-water separator, a particle filter, a three-way valve I, a three-way valve II, a three-way joint I, an air pump, a flowmeter I, a pressure gauge, a two-way valve, a switch I, a switch II, a switch V and a switch VI;
the air inlet end of the oil-water separator is connected with the atmosphere, the air outlet end of the oil-water separator is connected with the air inlet end of the particle filter through a connecting pipe, the A port of the three-way valve I is connected with the air outlet end of the particle filter through a connecting pipe, the air inlet end of the air pump is connected with the B port of the three-way valve I through a connecting pipe, the A port of the three-way valve II is connected with the air outlet end of the air pump through a connecting pipe, the A port of the three-way joint I is connected with the B port of the three-way valve II through a connecting pipe, and the C port of the three-way joint I is connected with the C port of the three-way valve I through a connecting pipe; the air inlet end of the flowmeter I is connected with the port B of the three-way joint I through a connecting pipe; the air inlet end of the pressure gauge is connected with the air outlet end of the flowmeter I through a connecting pipe; the air inlet end of the two-way valve is connected with the air outlet end of the pressure gauge through a connecting pipe;
the switch I and the switch II respectively control the three-way valve I and the three-way valve II; the switch V and the switch VI respectively control the air extracting pump and the two-way valve.
Further, the method further comprises the following steps: further comprises: an air dilution pump, a flowmeter II, a vane type mixer and a switch VII;
the air dilution pump and the flowmeter II form a second loop, and the air outlet end of the air dilution pump is connected with the air inlet end of the flowmeter II through a connecting pipe; the air outlet ends of the flowmeter I and the flowmeter II are connected with the air inlet end of the vane type mixer through connecting pipes; the air inlet end of the pressure gauge is connected with the air outlet end of the vane type mixer through a connecting pipe; the switch VII controls the dilution pump.
Further, the method further comprises the following steps: three-way valve III, three-way valve IV, three-way joint II, switch III and switch IV;
the port A of the three-way valve III is connected with the atmosphere, the port B of the three-way valve III is connected with the air inlet end of the air dilution pump through a connecting pipe, the port A of the three-way valve IV is connected with the air outlet end of the air dilution pump through a connecting pipe, the port B of the three-way valve IV is connected with the port A of the three-way joint II through a connecting pipe, and the port C of the three-way joint II is connected with the port C of the three-way valve III through a connecting pipe; the air inlet end of the II flowmeter is connected with the port B of the three-way joint II through a connecting pipe; the switch III and the switch IV are respectively used for controlling the three-way valve III and the three-way valve IV.
Further, the method further comprises the following steps: the box body is used for accommodating the three-way valve I, the three-way valve II, the three-way valve III, the three-way valve IV, the air extracting pump, the air diluting pump, the two-way valve, the flowmeter I, the flowmeter II and the pressure gauge;
the three-way valve I, the three-way valve II, the three-way valve III and the three-way valve IV are respectively controlled manually, and the switch I, the switch II, the switch III and the switch IV are respectively controlled to be respectively fixed on a box door of the box body;
the flowmeter I, the flowmeter II and the pressure gauge are all embedded on the box door;
the box is provided with three through holes which are respectively used for connecting the air inlet end of the oil-water separator, the C port of the three-way valve II and the C port of the three-way valve IV.
The invention also provides a gas detection device, which comprises the gas pretreatment device with the back pumping function and a gas detector;
the air inlet end of the air detector is connected with the air outlet end of the body front end pre-detection device through a connecting pipe.
The invention solves the problems of instability of values such as gas flow, gas temperature, gas pressure and the like, errors of test results and the like. The gas flow stabilizing, constant temperature and constant pressure, drying and cleaning are provided for the following detection equipment, so that the reliability of the gas test result is greatly improved and the service life of the gas detection equipment is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of an overall structure of an embodiment of the present invention;
FIG. 2 is a schematic diagram of the overall structure of a second embodiment of the present invention;
FIG. 3 is a schematic view of a third embodiment of the present invention;
FIG. 4 is a schematic diagram of a fifth embodiment of the present invention;
fig. 5 is a schematic diagram of the overall structure of a fourth embodiment of the present invention.
Wherein 1, an oil-water separator, 2, a particle filter, 3, a three-way valve I,31, an A port of the three-way valve I, 32, a B port of the three-way valve I, 33, a C port of the three-way valve I, 4, an air pump, 5, a three-way valve II,51, an A port of the three-way valve II, 52, a B port of the three-way valve II, 53, a C port of the three-way valve II, 6, a flowmeter I,7, a three-way connector II,71, an A port of the three-way connector II, 72, a B port of the three-way connector II, 73, a C port of the three-way connector II, 8, a pressure gauge, 9, a two-way valve, 10, a vane type mixer, 11 and an air dilution pump, 12, flow meter II,14, three-way valve III,141, three-way valve III, 142, three-way valve III, 143, three-way valve III, 15, three-way valve IV,151, three-way valve IV, 152, three-way valve IV, 153, three-way valve IV, 16, three-way joint I,161, three-way joint I, 162, three-way joint I, 163, three-way joint I, 17, gas detector, 18, switch I,19, switch II,20, switch III,21, switch IV,22, switch V,23, switch VI,24, switch VII.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a gas pretreatment device with a back pumping function and a gas detection device, comprising: the device comprises an oil-water separator, a particle filter, a three-way valve I, a three-way valve II, a three-way joint I, an air pump, a flowmeter I, a pressure gauge, a two-way valve, a switch I, a switch II, a switch V and a switch VI;
the air inlet end of the oil-water separator is connected with the atmosphere, the air outlet end of the oil-water separator is connected with the air inlet end of the particle filter through a connecting pipe, the A port of the three-way valve I is connected with the air outlet end of the particle filter through a connecting pipe, the air inlet end of the air pump is connected with the B port of the three-way valve I through a connecting pipe, the A port of the three-way valve II is connected with the air outlet end of the air pump through a connecting pipe, the A port of the three-way joint I is connected with the B port of the three-way valve II through a connecting pipe, and the C port of the three-way joint I is connected with the C port of the three-way valve I through a connecting pipe; the air inlet end of the flowmeter I is connected with the port B of the three-way joint I through a connecting pipe; the air inlet end of the pressure gauge is connected with the air outlet end of the flowmeter I through a connecting pipe; the air inlet end of the two-way valve is connected with the air outlet end of the pressure gauge through a connecting pipe;
the switch I and the switch II respectively control the three-way valve I and the three-way valve II; the switch V and the switch VI respectively control the air extracting pump and the two-way valve.
Specifically, as shown in fig. 1, in the first embodiment, before the switch I, the switch II, the switch V, and the switch VI are respectively the knob I, the knob II, the button I, and the button II open the whole set of equipment, in order to verify whether the whole pipeline leaks air, the pipeline leak detection operation is required before the operation, the button I is pressed, and the suction pump is started; and pressing the button II, closing the two-way valve, enabling the gas to be detected to flow through the whole pipeline, observing whether the index of the pressure gauge is unchanged, if the pressure is unchanged, considering that the gas is not leaked, and if the pressure value fluctuation is large, indicating that the gas is leaked, and the pressure gauge can flash to prompt and alarm in a red light mode.
Normal operation: powering up all the devices, pressing the button I, and starting the air pump; rotating the knob I and the knob II leftwards, respectively opening the three-way valve I and the three-way valve II to enable gas to be tested to flow from an A port to a B port, and closing the direction from the B port to the A port at the moment; under the action of the three-way valve I, the air extracting pump and the three-way valve II, pretreatment of the gas to be detected is realized; the oil-water separator is small-sized equipment, is arranged at the forefront end of the whole loop and is used for carrying out primary oil-water separation operation on gas to be detected, and the working principle of the oil-water separator is as follows: the sewage pump sends the oily sewage into the oil-water separator, and after passing through the diffusion nozzle, large-particle oil drops float on the top of the left oil collecting chamber; the sewage containing small oil drops enters a corrugated plate coalescer at the lower part, and partial oil drops are polymerized into larger oil drops to a right oil collecting chamber; the sewage containing smaller oil drops passes through a fine filter, impurities in water are discharged, and the sewage sequentially enters a fiber polymerizer, so that the small oil drops are polymerized into larger oil drops which are separated from water; after separation, clean water is discharged through a discharge port, dirty oil in the left and right oil collecting chambers is automatically discharged through an electromagnetic valve, and the dirty oil separated out in the fiber polymerizer is discharged through a manual valve; the discharged dirty oil is further filtered through a particle filter, and finally the filtered gas to be tested enters through an A port of the three-way valve I, is discharged from a B port of the three-way valve I, flows through the air pump to enter an A port of the three-way valve II, is discharged to an A port of the three-way joint I through a B port of the three-way valve II, and is discharged to the flowmeter I, the pressure gauge and the two-way valve through a B port of the three-way joint I; the flowmeter I is used for detecting the flow of the gas to be detected;
and (3) back-pumping: the knob I and the knob II are required to be rotated rightwards, the three-way valve I and the three-way valve II are respectively opened, so that gas to be tested flows from the port B to the port A, and at the moment, the direction from the port A to the port B is closed; pressing the button I to start the air pump; according to the working principle of the three-way valve, in the back pumping process, the port B of the three-way valve II is not communicated with the port A of the three-way joint I, and the front end pipeline of the port A of the three-way valve I is not communicated; at this time, the flow directions of the residual gas after the last pretreatment in the flowmeter I and the pressure gauge after the port B of the three-way joint I are: the three-way valve comprises a three-way joint I, a three-way valve II, a three-way valve I, a three-way valve II and a three-way valve II, wherein the three-way joint I comprises a B port, a C port of the three-way joint I, a C port of the three-way valve I, a B port of the three-way valve I, an air inlet end of an air pump, an air outlet end of the air pump, an A port of the three-way valve II and a C port of the three-way valve II are discharged into the atmosphere through the C port of the three-way valve II; in order to prevent errors caused by the last measurement in the gas residual equipment and the pipeline, the part of gas remained in the pipeline after the last measurement is reversely pumped out, so that the success rate of detection is improved.
Further, the method further comprises the following steps: an air dilution pump, a flowmeter II, a vane type mixer and a switch VII;
the air dilution pump and the flowmeter II form a second loop, and the air outlet end of the air dilution pump is connected with the air inlet end of the flowmeter II through a connecting pipe; the air outlet ends of the flowmeter I and the flowmeter II are connected with the air inlet end of the vane type mixer through connecting pipes; the air inlet end of the pressure gauge is connected with the air outlet end of the vane type mixer through a connecting pipe; the switch VII controls the dilution pump.
Specifically, as shown in fig. 2, in the second embodiment, the switch VII is a button III, and simultaneously, the button III for controlling the air dilution pump is pressed, the air dilution pump is started, the air dilution pump sucks outside air into a pipeline for diluting the gas to be measured with too high concentration, the sucked air flows through the flowmeter II, the flowmeter II is used for detecting the flow rate of the air, the gas to be measured flowing through the flowmeter II is mixed with the gas to be measured flowing through the flowmeter I, and the two gases simultaneously flow through the blade-type mixer; the mixing bin of the vane type mixer is made of a series of mixing units with different specifications, and due to the effect of the mixing units, two gases are timely left-handed and timely right-handed, the flowing direction is continuously changed, and the central liquid flow is pushed to the periphery, and the peripheral liquid flow is pushed to the center, so that a good radial mixing effect is caused. At the same time, the rotation of the two gases can also occur on the joint of the adjacent components, and the perfect radial circulation mixing effect can lead the two gases to achieve the purpose of uniform mixing.
Further, the method further comprises the following steps: three-way valve III, three-way valve IV, three-way joint II, switch III and switch IV;
the port A of the three-way valve III is connected with the atmosphere, the port B of the three-way valve III is connected with the air inlet end of the air dilution pump through a connecting pipe, the port A of the three-way valve IV is connected with the air outlet end of the air dilution pump through a connecting pipe, the port B of the three-way valve IV is connected with the port A of the three-way joint II through a connecting pipe, and the port C of the three-way joint II is connected with the port C of the three-way valve III through a connecting pipe; the air inlet end of the II flowmeter is connected with the port B of the three-way joint II through a connecting pipe; the switch III and the switch IV are respectively used for controlling the three-way valve III and the three-way valve IV.
Specifically, as shown in fig. 3, in the third embodiment, the switch III and the switch IV are a knob III and a knob IV, respectively, and the air inlet end and the air outlet end of the air dilution pump are connected with the three-way valve III and the three-way valve IV through connecting pipes, respectively;
during normal operation: after the button III is pressed down and the air dilution pump is started, the knob III and the knob IV are simultaneously rotated leftwards, air enters through an A port of the three-way valve III, is discharged from a B port of the three-way valve III, flows through the air dilution pump to enter an A port of the three-way valve IV, is discharged from a B port of the three-way valve IV to an A port of the three-way connector II, and is discharged from a B port of the three-way connector II to the flowmeter II;
and (3) back-pumping: the knob III and the knob IV are required to be rotated rightwards, the three-way valve III and the three-way valve IV are respectively opened, so that gas to be tested flows from the port B to the port A, and at the moment, the direction from the port A to the port B is closed; pressing the button I to start the air pump; according to the working principle of the three-way valve, in the back pumping process, the port B of the three-way valve IV is not communicated with the port A of the three-way joint II; at this time, the flow direction of the gas remained in the device after the port B of the three-way joint II is as follows: the device comprises a three-way joint II, a three-way valve III, an air dilution pump, a three-way valve IV and a three-way valve III, wherein the three-way joint II comprises a B port, the three-way joint II comprises a C port, the three-way valve III comprises a B port, the air dilution pump comprises an air inlet end, an air outlet end, the three-way valve IV comprises an A port, the three-way valve IV comprises a C port, and the three-way valve IV comprises a C port;
further, the method further comprises the following steps: the box body is used for accommodating the three-way valve I, the three-way valve II, the three-way valve III, the three-way valve IV, the air extracting pump, the air diluting pump, the two-way valve, the flowmeter I, the flowmeter II and the pressure gauge;
the knob I, the knob II, the knob III and the knob IV for respectively controlling the three-way valve I, the three-way valve II, the three-way valve III and the three-way valve IV manually are all fixed on the box door of the box body;
the flowmeter I, the flowmeter II and the pressure gauge are all embedded on the box door;
the box is provided with three through holes which are respectively used for connecting the air inlet end of the oil-water separator, the C port of the three-way valve II and the C port of the three-way valve IV.
Specifically, as shown in fig. 5, in the fourth embodiment, all devices and circuits are disposed in the box, and for convenience in controlling each device, a knob and a button for controlling are fixed on the box door by bolts; meanwhile, in order to conveniently read data, a dial plate of instrument equipment is inlaid on the box door; the box body is also provided with three through holes which are respectively used for connecting the air inlet end of the oil-water separator, the C port of the three-way valve II and the C port of the three-way valve IV; the device control and the data reading are more convenient and faster.
The invention also provides a gas detection device, which comprises the gas pretreatment device with the back pumping function and a gas detector;
the air inlet end of the air detector is connected with the air pretreatment device with the back pumping function and the air outlet end of the air detector through a connecting pipe.
Specifically, as shown in fig. 4, in the fifth embodiment, the gas detector is an external device, and can be connected to the two-way valve in the case through the through hole in the case, so as to detect the gas flowing through the two-way valve.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. Gas pretreatment device and gas detection device with back-pumping function, characterized by comprising: the device comprises an oil-water separator, a particle filter, a three-way valve I, a three-way valve II, a three-way joint I, an air pump, a flowmeter I, a pressure gauge, a two-way valve, a switch I, a switch II, a switch V and a switch VI;
the air inlet end of the oil-water separator is connected with the atmosphere, the air outlet end of the oil-water separator is connected with the air inlet end of the particle filter through a connecting pipe, the A port of the three-way valve I is connected with the air outlet end of the particle filter through a connecting pipe, the air inlet end of the air pump is connected with the B port of the three-way valve I through a connecting pipe, the A port of the three-way valve II is connected with the air outlet end of the air pump through a connecting pipe, the A port of the three-way joint I is connected with the B port of the three-way valve II through a connecting pipe, and the C port of the three-way joint I is connected with the C port of the three-way valve I through a connecting pipe; the air inlet end of the flowmeter I is connected with the port B of the three-way joint I through a connecting pipe; the air inlet end of the pressure gauge is connected with the air outlet end of the flowmeter I through a connecting pipe; the air inlet end of the two-way valve is connected with the air outlet end of the pressure gauge through a connecting pipe;
the switch I and the switch II respectively control the three-way valve I and the three-way valve II; the switch V and the switch VI respectively control the air extracting pump and the two-way valve.
2. The gas pretreatment device and the gas detection device with the back-pumping function according to claim 1, further comprising: an air dilution pump, a flowmeter II, a vane type mixer and a switch VII;
the air dilution pump and the flowmeter II form a second loop, and the air outlet end of the air dilution pump is connected with the air inlet end of the flowmeter II through a connecting pipe; the air outlet ends of the flowmeter I and the flowmeter II are connected with the air inlet end of the vane type mixer through connecting pipes; the air inlet end of the pressure gauge is connected with the air outlet end of the vane type mixer through a connecting pipe; the switch VII controls the dilution pump.
3. The gas pretreatment device and the gas detection device with the back-pumping function according to claim 2, further comprising: three-way valve III, three-way valve IV, three-way joint II, switch III and switch IV;
the port A of the three-way valve III is connected with the atmosphere, the port B of the three-way valve III is connected with the air inlet end of the air dilution pump through a connecting pipe, the port A of the three-way valve IV is connected with the air outlet end of the air dilution pump through a connecting pipe, the port B of the three-way valve IV is connected with the port A of the three-way joint II through a connecting pipe, and the port C of the three-way joint II is connected with the port C of the three-way valve III through a connecting pipe; the air inlet end of the II flowmeter is connected with the port B of the three-way joint II through a connecting pipe; the switch III and the switch IV are respectively used for controlling the three-way valve III and the three-way valve IV.
4. A gas pretreatment device and a gas detection device with a back-pumping function according to any one of claims 1 to 3, further comprising: the box body is used for accommodating the three-way valve I, the three-way valve II, the three-way valve III, the three-way valve IV, the air extracting pump, the air diluting pump, the two-way valve, the flowmeter I, the flowmeter II and the pressure gauge;
the three-way valve I, the three-way valve II, the three-way valve III and the three-way valve IV are respectively controlled manually, and the switch I, the switch II, the switch III and the switch IV are respectively controlled to be respectively fixed on a box door of the box body;
the flowmeter I, the flowmeter II and the pressure gauge are all embedded on the box door;
the box is provided with three through holes which are respectively used for connecting the air inlet end of the oil-water separator, the C port of the three-way valve II and the C port of the three-way valve IV.
5. A gas detection device, characterized by comprising the gas pretreatment device with the back-pumping function, the gas detection device and the gas detector according to any one of claims 1 to 4;
the air inlet end of the air detector is connected with the air pretreatment device with the back pumping function and the air outlet end of the air detector through a connecting pipe.
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| CN201910214426.XA CN109932490B (en) | 2019-03-20 | 2019-03-20 | Gas pretreatment device with back-pumping function and gas detection device |
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| CN201910214426.XA CN109932490B (en) | 2019-03-20 | 2019-03-20 | Gas pretreatment device with back-pumping function and gas detection device |
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| CN109932490B true CN109932490B (en) | 2024-02-13 |
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