CN214952507U - Gas compression device for detecting ambient gas nano particles - Google Patents
Gas compression device for detecting ambient gas nano particles Download PDFInfo
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- CN214952507U CN214952507U CN202121166068.9U CN202121166068U CN214952507U CN 214952507 U CN214952507 U CN 214952507U CN 202121166068 U CN202121166068 U CN 202121166068U CN 214952507 U CN214952507 U CN 214952507U
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Abstract
The utility model relates to a gas compression device for detecting environmental gas nano particles, which comprises a shell; a compression cavity for containing gas is arranged in the shell; the shell is provided with an air flow channel for connecting an external compression pump; the airflow channel communicates the compression chamber with the environment outside the housing; the shell is also provided with a light channel; realize through the air current passageway that outside compression pump squeezes gas into in the compression chamber, release gas through the air current passageway fast when gas compression to target state for the diameter minimum in the sample gas is to 0.002 mu m's invisible particles enlargies into the detectable water droplet that the diameter range is 10 mu m-20 mu m, realize the enlargies to nano particle diameter in the ambient gas, the light passageway is jeted into the laser source and is detected, detect the particle quantity by outside photoelectric sensor, through the process of enlarging of the diameter of control according to the change of each item gas index, make the testing result more accurate, can produce stage quick reaction at harmful particle, reduce the production of accident.
Description
Technical Field
The utility model relates to an environmental gas monitoring technology field, more specifically say, relate to a gas compression device that environmental gas nanometer particle was surveyed.
Background
In daily life, whether indoors or outdoors, a large amount of compounds exist in ambient gas, and when the compounds reach a critical condition where chemical changes occur, invisible submicron harmful particles (about 0.002 μm in diameter) are released, rapidly grow and form a pile in the environment, and when the amount reaches a critical state, the transition occurs, causing accidents.
The most common of these accidents is the occurrence of a fire. When a substance is heated to overheating, i.e. the material decomposes due to a chemical change, invisible submicron particles (about 0.002 μm in diameter) are released, and when the substance is heated continuously to reach the ignition point, carbon particles (so-called soot) begin to be generated by transformation and begin to dissolve and burn. The stage from material pyrolysis to smoke generation, which we call the "very early" stage of fire, is shown in figure 1.
The quantity of sub-micron particles generated in the very early stage is very large, but the volume is far smaller than that of ordinary dust particles, so that the photoelectric detector is influenced by the dust particles with very small quantity but very high relative light shielding rate, and is far larger than the sub-micron particles, so that the difference in quantity between the sub-micron particles and the dust particles cannot be distinguished.
The existing gas compression device divides the interior into two parts for improving the detection efficiency as much as possible, and then realizes alternate detection, so that the quantity of gas in the device is difficult to grasp, the problems of poor air tightness and the like exist, the fire detection result is inaccurate, the judgment result is wrong, and certain potential safety hazards exist.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the present invention is to provide a gas compression device for detecting nanoparticles, which is suitable for the above-mentioned defects of the prior art.
The utility model provides a technical scheme that its technical problem adopted is:
a gas compression device for detecting environmental gas nano particles is provided, which comprises a shell; a compression cavity for containing gas is arranged in the shell; the shell is provided with an airflow channel for connecting an external compression pump; the airflow passage communicates the compression chamber with an environment external to the housing; the shell is also provided with a light channel.
Further, the air flow channel comprises an air inlet and an air outlet which are arranged on the end surface of the shell; the air inlet and the air outlet are respectively positioned on the opposite end surfaces of the shell; the air inlet is used for connecting an external compression pump.
Further, the direction of the light channel is perpendicular to the direction of the air flow channel; the light channel comprises an incident hole, an emergent hole and a receiving hole; the incident hole and the emergent hole are respectively positioned on the opposite side walls of the shell; the incident light of the incident hole is emitted into the emergent hole after passing through the compression cavity; the receiving hole is located on the back of the shell; and the optical axis of the receiving hole is vertical to the optical axis of the entrance hole.
Further, an installation part for installing the laser source is arranged on the side wall, close to the entry hole, of the shell.
Further, a extinction member for extinction is arranged on the side wall, close to the emergent hole, of the shell.
Furthermore, the number of the incident holes, the number of the emergent holes, the number of the receiving holes, the number of the mounting parts and the number of the extinction pieces are all 1.
Furthermore, the number of the incident holes, the number of the emergent holes, the number of the receiving holes, the number of the mounting parts and the number of the extinction pieces are all 2.
Furthermore, the light filters are arranged on the incident holes and the receiving holes.
Furthermore, a heat insulating layer is arranged on the wall of the compression cavity.
Furthermore, a top cover is arranged on the shell.
The beneficial effects of the utility model reside in that: realize through the air current passageway that outside compression pump squeezes gas into in the compression chamber, release gas through the air current passageway fast when gas compression to target state for the diameter minimum in the sample gas is to 0.002 mu m's invisible particles enlargies into the detectable water droplet that the diameter range is 10 mu m-20 mu m, realize the enlargies to nano particle diameter in the ambient gas, it detects to kick into the laser source through the light passageway, and detect the particle quantity by outside photoelectric sensor, the gaseous volume of compression intracavity is confirmed, through the process of enlarging of control particle diameter according to the change of each item gas index, make the testing result more accurate, can produce stage quick reaction at harmful particle, reduce the production of accident.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work according to the drawings:
FIG. 1 is a schematic view of ion concentration in various stages from material pyrolysis to smoke generation in the prior art of the present invention;
fig. 2 is a schematic structural diagram of a gas compression device for detecting ambient gas nanoparticles according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a gas compression device for detecting ambient gas nanoparticles according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a housing according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a gas compression device for detecting ambient gas nanoparticles according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a gas compression device for detecting ambient gas nanoparticles according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a housing according to a second embodiment of the present invention.
In the figure, 1, a housing; 2. a top cover; 3. a compression chamber; 4. an air inlet; 5. an air outlet; 6. a light attenuating member; 7. a laser source; 11. entering a perforation hole; 12. an installation part; 13. an exit aperture; 14. an optical filter; 15. receiving a hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The first embodiment is as follows:
as shown in fig. 2 to 4, a gas compression device for ambient gas nanoparticle detection is provided, which comprises a housing 1; a compression chamber 3 for containing gas is arranged in the shell 1; the shell 1 is provided with an airflow channel for connecting an external compression pump; the airflow channel connects the compression chamber 3 with the environment outside the casing 1; the shell 1 is also provided with a light channel.
An external compression pump pumps gas into the compression chamber 3 through the gas flow channel, and the gas is rapidly released through the gas flow channel when the gas is compressed to a target state in the compression chamber 3, so that invisible particles with a diameter of at least 0.002 μm in the sample gas are amplified into detectable water droplets with a diameter in the range of 10 μm to 20 μm. At the moment, the light channel emits into the laser source 7, the light is irradiated on the particles to generate refracted light, the refracted light is received by the photoelectric sensor arranged on the surface of the shell 1, and the number of the particles in the compression cavity 3 is calculated.
In the above embodiments, the target state is a target parameter for achieving compression, and the target parameter includes, but is not limited to, a target pressure, a compression time, a target temperature, and a target humidity; and/or other parameters of interest that cause the invisible nanoparticles in the sample gas to condense into droplets of detectable diameter, respectively. Wherein the target pressure is: 30Kpa to 150 Kpa; preferably, the target pressure is: 50Kpa to 110 Kpa.
In a further embodiment, the air flow channel comprises an air inlet 4 and an air outlet 5 arranged on the end face of the housing 1; the air inlet 4 and the air outlet 5 are respectively positioned on the opposite end surfaces of the shell 1; the air inlet 4 is used for connecting an external compression pump.
The air inlet 4 is connected with an external compression pump, the air outlet 5 is used for quickly releasing air when the air in the compression cavity 3 is compressed to a target state, and the air inlet 4 and the air outlet 5 are arranged on opposite end faces, so that the air inlet 4, the compression cavity 3 and the air outlet 5 form an air flow channel.
In the above-described embodiment, the target pressure is set by setting the compression frequency of the gas compression pump and/or the gas flow rate of the gas inlet 4, and the compression time during compression, at the time of determination of the volume of the compression chamber 3. Specifically, the gas compression frequency is determined by the target pressure value for compressing the sample gas, the volume of the compression chamber 3, and the gas flow rate, i.e., the gas is compressed into the compression chamber 3 at a certain gas flow rate, and the larger the volume of the compression chamber 3, the slower the gas pressure reaches the target pressure value for compressing the sample gas. The gas compression frequency is one operation cycle, the time required for the gas to be injected into the compression chamber 3 at a certain gas flow rate is set to T1, the time required for detecting whether the gas pressure value reaches the target pressure value is set to T2, and the time required for one operation cycle is T1+ T2, that is, the gas compression frequency is T. In the gas compression process, the compression cavity 3 is continuously inflated by taking the gas compression frequency T as a reference until the gas pressure value in the compression cavity 3 reaches the target pressure value for compressing the sample gas. The faster the gas compression frequency is, the shorter the time of a single compression period is, and the quicker the particle size amplification process is; the slower the gas compression frequency, the longer the time of a single compression cycle, and the slower the particle size enlargement process. For example, the gas compression frequency may be set to 5 seconds.
In the above embodiment, the maximum inflation pressure of the compression chamber 3 is 130Kpa, and the air flow rate of the intake port 4 is 5L/min. The external compressor pump can also pump air out of the compression chamber 3 with a flow rate of 5L/min, and the maximum pumping vacuum pressure reaches 70 Kpa.
In a further embodiment, the direction of the light passage is perpendicular to the direction of the air flow passage; the light path comprises an incident hole 11, an emergent hole 13 and a receiving hole 15; the incident hole 11 and the exit hole 13 are respectively positioned on the opposite side walls of the shell 1; the incident light of the incident hole 11 passes through the compression cavity 3 and then is emitted into the emergent hole 13; receiving hole 15 is located on the back of housing 1; the optical axis of the receiving hole 15 is perpendicular to the optical axis of the incident hole 11. Wherein the optical axis of the entrance aperture 11 is coaxial with the optical axis of the exit aperture 13.
The entrance hole 11 is used for entering the laser source 7, and the laser source 7 generates refracted light after irradiating on the particles. The exit aperture 13 is used to absorb stray light that is not scattered by the cloud or dust by the parallel-oriented light and the four walls that absorb the light. The receiving hole 15 is used for receiving the refracted light, and the photoelectric sensor absorbs the scattered light in a specific range in the side direction to form an electric signal, the electric signal firstly passes through a current-voltage conversion circuit unit, the current signal is converted into a voltage signal of more than 100mV, the voltage signal passes through a signal amplifying circuit and is amplified to the extent that the voltage signal can be recognized by an internal AD conversion circuit of an external control center, and the external control center calculates the concentration of the particles in the compression cavity 33 by using a particle concentration diagnostic algorithm according to the converted light intensity information.
In the above embodiment, the particle concentration diagnosis method is to use a correlation algorithm comprehensively based on the Mie scattering theory of light, collect the scattered light scattered by the particles in the compression chamber 3 with a photoelectric sensor, simulate the light flux, and obtain the relationship between the number of particles and the collected photoelectric signal, thereby calculating the number of particles in the sample air in the gas compression chamber 3. When the number of dust particles in the air is much smaller than the number of sub-micron particles of 0.002 μm (about 1: 25 or more), and the number of particles becomes countable, the thermal degradation alarm threshold can be set to be higher than the maximum value of the dust number, such as 100000/cc, by the maximum value of the dust number (not exceeding 60000/cc) existing in the air, which can be away from the trouble of false alarm and can quickly respond at the stage of generating harmful particles.
In a further embodiment, the housing 1 is provided with a mounting 12 on its side wall near the entry hole 11 for mounting the laser source 7. An external laser transmitter is installed on the installation part 12, the laser transmitter emits a laser source 7 to irradiate on the gas particles amplified in the compression cavity 3, refracted light is generated, the photoelectric sensor at the receiving hole 15 receives the refracted light, light flux is simulated, the relation between the particle number and the collected photoelectric signal is obtained, and therefore the particle number in the sample air in the gas compression cavity 3 is calculated.
In a further embodiment, the side wall of the housing 1 near the exit aperture 13 is provided with a light extinction member 6 for light extinction. In detecting the particle concentration, stray light that is not scattered by the cloud or dust is absorbed by the four walls that light in parallel directions and absorb light. The extinction member 6 is a diaphragm.
In a further embodiment, the number of the incident holes 11, the exit holes 13, the receiving holes 15, the mounting portion 12 and the light-attenuating members 6 is 1.
In a further embodiment, the entrance aperture 11 and the receiving aperture 15 are provided with filters 14. The shell 1 is provided with a top cover 2. The optical filter 14 is used for selecting a required radiation waveband, and the laser source 7 of the required waveband is selected according to different refractive indexes of the optical filter 14, wherein the wavelength range of the laser source 7 irradiated into the compression cavity 3 is 400-980nm, the power range is 10-100 mw, refracted light can be generated after the laser source is irradiated on detectable particles or dust with the diameter range of 10-20 μm, the photoelectric sensor receives the refracted light, converts an optical signal into an electric signal, detects the intensity of the refracted light, calculates the corresponding relation between the intensity of the light and the number of the particles by adopting a certain algorithm, and can calculate the number of all the particles in the sample air according to the measured intensity of the light.
In the above embodiment, the optical filter 14 is made of an acrylic transparent material.
In a further embodiment, the walls of the compression chamber 3 are provided with a heat insulating layer. The insulating layer makes the compression process of the gas in the compression chamber 3 be adiabatic compression, i.e. the gas is compressed without heat exchange with the outside. Adiabatic compression results in a reduction in gas volume and an increase in pressure.
Example two:
as shown in fig. 5 to 7, a gas compression device for ambient gas nanoparticle detection is provided, which comprises a housing 1; a compression chamber 3 for containing gas is arranged in the shell 1; the shell 1 is provided with an airflow channel for connecting an external compression pump; the airflow channel connects the compression chamber 3 with the environment outside the casing 1; the shell 1 is also provided with a light channel. The second embodiment is the same as the first embodiment except that the number of the incident holes 11, the exit holes 13, the receiving holes 15, the mounting portions 12 and the extinction members 6 is different, that is, the number of the incident holes 11, the exit holes 13, the receiving holes 15, the mounting portions 12 and the extinction members 6 is 2. The incident hole 11, the emergent hole 13, the receiving hole 15, the mounting part 12 and the extinction part 6 are arranged up and down, so that when the number of the nano particles is detected, the detection range is wider, and the result is more accurate.
In conclusion, according to the gas compression device, gas is pumped into the compression cavity 3 by the external compression pump through the gas flow channel, the gas is rapidly released through the gas flow channel when the gas is compressed to a target state, invisible particles with the diameter of 0.002 mu m as the minimum in sample gas are amplified into detectable water drops with the diameter range of 10 mu m-20 mu m, the amplification of the particle size of nano particles in environmental gas is achieved, the particles are injected into the laser source 7 through the light channel for detection, the number of the particles is detected by the external photoelectric sensor, the amount of the gas in the compression cavity 3 is determined, the particle size amplification process is controlled according to the change of various gas indexes, the detection result is more accurate, the rapid reaction can be achieved in the harmful particle generation stage, and the generation of accidents is reduced.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (10)
1. A gas compression device that gaseous nanometer particle of environment surveyed which characterized in that: comprises a shell; a compression cavity for containing gas is arranged in the shell; the shell is provided with an airflow channel for connecting an external compression pump; the airflow passage communicates the compression chamber with an environment external to the housing; the shell is also provided with a light channel.
2. The ambient gas nanoparticle detection gas compression device of claim 1, wherein the gas flow channel comprises a gas inlet and a gas outlet disposed on an end face of the housing; the air inlet and the air outlet are respectively positioned on the opposite end surfaces of the shell; the air inlet is used for connecting an external compression pump.
3. A gas compression device for ambient gas nanoparticle detection as recited in claim 1, wherein the direction of the light channel is perpendicular to the direction of the gas flow channel; the light channel comprises an incident hole, an emergent hole and a receiving hole; the incident hole and the emergent hole are respectively positioned on the opposite side walls of the shell; the incident light of the incident hole is emitted into the emergent hole after passing through the compression cavity; the receiving hole is located on the back of the shell; and the optical axis of the receiving hole is vertical to the optical axis of the entrance hole.
4. A gas compression device for ambient gas nanoparticle detection as claimed in claim 3 wherein the housing is provided with a mounting portion on a side wall adjacent to the entry hole for mounting a laser source.
5. A gas compression device for ambient gas nanoparticle detection according to claim 4, wherein a light extinction member for extinction is provided on a side wall of the housing adjacent to the exit aperture.
6. The ambient gas nanoparticle detection gas compression device of claim 5, wherein the number of the entry hole, the exit hole, the receiving hole, the mounting portion and the extinction member is 1.
7. The ambient gas nanoparticle detection gas compression device of claim 5, wherein the number of the entry hole, the exit hole, the receiving hole, the mounting portion and the extinction member is 2.
8. The gas compressing apparatus for ambient gas nanoparticle detection as recited in claim 3, wherein the entrance hole and the receiving hole are provided with optical filters.
9. A gas compressing device for nano-particle detection of environmental gases as claimed in claim 1, wherein the wall of the compression chamber is provided with a heat insulating layer.
10. The ambient gas nanoparticle detection gas compression device of claim 1, wherein a top cover is provided over the housing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121166068.9U CN214952507U (en) | 2021-05-27 | 2021-05-27 | Gas compression device for detecting ambient gas nano particles |
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| CN202121166068.9U CN214952507U (en) | 2021-05-27 | 2021-05-27 | Gas compression device for detecting ambient gas nano particles |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115711968A (en) * | 2022-11-04 | 2023-02-24 | 河北雷格科技发展有限公司 | Automatic air monitoring station room |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115711968A (en) * | 2022-11-04 | 2023-02-24 | 河北雷格科技发展有限公司 | Automatic air monitoring station room |
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