CN116124656A - Detection system for nano particles in ambient gas and control method thereof - Google Patents
Detection system for nano particles in ambient gas and control method thereof Download PDFInfo
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- CN116124656A CN116124656A CN202211379608.0A CN202211379608A CN116124656A CN 116124656 A CN116124656 A CN 116124656A CN 202211379608 A CN202211379608 A CN 202211379608A CN 116124656 A CN116124656 A CN 116124656A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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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
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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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
Abstract
The application relates to a detection system of nano particles in ambient gas and a control method thereof, which comprises the following steps: the sampling assembly is provided with a sampling pump and a first filter; the detection chamber is connected with an air outlet of the sampling assembly through a second filter and a first control valve which are sequentially connected; the detection chamber is used for detecting the nano particles in the ambient gas collected by the sampling assembly; an air flow channel and a second control valve are arranged at the communication part of the air inlet of the pressure regulating chamber and the air outlet of the detection chamber; the pressure regulating chamber is provided with a vacuum exhaust device. When the second control valve is opened instantly, the detection chamber and the pressure regulating chamber are communicated, the pressure in the detection chamber is reduced, the gas molecular energy in the detection chamber is reduced, the nano particles have the condition of forming condensation nuclei, the detection chamber can detect the nano particles, the pressure values of the detection chamber and the pressure regulating chamber are always kept at normal pressure or negative pressure in the process of forming the condensation nuclei by the nano particles, and the service life of the detection chamber is prolonged to a certain extent.
Description
Technical Field
The application relates to the technical field of fire safety on-line monitoring, in particular to a detection system of nano particles in ambient gas and a control method thereof.
Background
At present, in the technical field of fire safety on-line monitoring, the environmental gas often contains a large amount of safety information, and the information of the environmental gas is fully utilized to discover potential safety hazards possibly existing as early as possible before a fire accident happens. If the circuit is overheated in the environment scene of centralized circuit such as power distribution room, battery energy storage case, if not in time carry out manual intervention, very easily develop into serious fire accident in the later stage, cause great equipment loss and casualties accident. In the initial stage of accident, the temperature of the circuit surface is gradually increased, and a large amount of nano particles with the particle size ranging from 2nm to 10nm are separated out from the coating layer on the surface. When the surface of the circuit is continuously heated to a certain threshold value, the nano particles are converted to generate carbon particles, and the carbon particles start to be dissolved and burnt, so that a large amount of toxic gases such as smoke with particle size ranging from 400nm to 1200nm, carbon monoxide and the like are generated. If early warning work can be carried out on environmental safety at the stage of generating the nano particles, rescue time can be striven for operation and maintenance personnel to a great extent.
In some related technologies, in order to realize early warning detection of extremely early fire, an active air suction mode is adopted to sample in the related technologies, and a person skilled in the art often adopts an air collection pump to sample ambient air and conveys the sampled air into a cloud chamber for optical detection. Because the particle size of the nano particles is extremely small, the existing optical detection technology cannot directly detect the nano particles, so that the particle size of the nano particles is required to be amplified to the level capable of being detected optically by certain pretreatment in the process of conveying the sampling gas to the cloud chamber. But has the following problems:
in the detection process, the thermodynamic property of gas molecules is fully utilized, the gas is required to be compressed in the detection cavity, and the periodical bearing of larger pressure in the detection cavity has a certain influence on the sealing property and the structural reliability of the detection cavity, so that the service life of the detection cavity is seriously influenced.
Disclosure of Invention
The embodiment of the application provides a detection system and a control method for nano particles in ambient gas, which are used for solving the problem that the service life of a detection cavity is influenced due to the fact that the detection cavity in the related technology needs to bear larger pressure periodically.
In a first aspect, there is provided a detection system for nanoparticles in an ambient gas, comprising:
the sampling assembly is provided with a sampling pump and is provided with two air outlets and an air inlet, and the air inlet is provided with a first filter;
a detection assembly having a detection chamber and a pressure regulating chamber;
the detection chamber is connected with one air outlet of the sampling assembly through a second filter and a first control valve which are sequentially connected; the detection chamber is used for detecting nano particles in the ambient gas collected by the sampling assembly;
the pressure regulating chamber is connected with a vacuum exhaust device; at least one airflow channel which can be communicated or blocked through a second control valve is formed between the air inlet of the pressure regulating chamber and the air outlet of the detection chamber.
In some embodiments, the detection chamber and the pressure regulating chamber are arranged at intervals, a chamber air outlet is formed in one side surface of the detection chamber, and a chamber air inlet corresponding to the chamber air outlet is formed in one side surface of the pressure regulating chamber facing the detection chamber;
the cavity air outlet is communicated with the cavity air inlet through a communicating piece so as to form the airflow channel;
wherein the second control valve is arranged on the communication piece.
In some embodiments, a chamber air outlet is formed on one side surface of the detection chamber, and a chamber air inlet is formed on one side surface of the pressure regulating chamber facing the detection chamber; the side surface of the detection chamber with the chamber air outlet is abutted with the side surface of the pressure regulating chamber with the chamber air inlet, and the detection chamber and the pressure regulating chamber can relatively move;
the detection system further comprises a driving structure, wherein the driving structure is fixedly connected with the detection chamber or the pressure regulating chamber so as to drive the detection chamber and the pressure regulating chamber to be connected or disconnected with the chamber air outlet and the chamber air inlet when the detection chamber and the pressure regulating chamber relatively move.
In some embodiments, the detection chamber has a cavity volume that is less than the cavity volume of the pressure regulating chamber.
In some embodiments, the cavity volume ratio of the detection chamber to the pressure regulating chamber is 1/6-1/2.
In some embodiments, an anti-reflection layer is provided on the inner wall of the detection chamber; and heat insulation layers are arranged on the outer walls of the detection chamber and the pressure regulating chamber.
In some embodiments, the detection chamber and the pressure regulating chamber are provided with pressure sensors for detecting air pressure.
In a second aspect, a method for controlling a detection system for nanoparticles in an ambient gas is provided, comprising the steps of:
s01, opening the first control valve and the second control valve to communicate the air flow channel; simultaneously starting the sampling pump and the vacuum exhaust device to a first set time so as to enable the inside of the detection chamber and the pressure regulating chamber to be filled with sampling gas under the condition of keeping normal pressure;
s02, closing the first control valve, the second control valve and the sampling pump, and then continuously operating the vacuum exhaust device for a second set time to vacuumize the pressure-regulating chamber;
and S03, closing the vacuum exhaust device, opening the second control valve, and detecting the nano particles in the ambient gas collected by the sampling assembly.
In some embodiments, the first set time is 2s to 4s; the second setting time is 0.5 s-2 s.
In some embodiments, the step S02 may be replaced by:
and closing the first control valve, the second control valve and the sampling pump, and then continuously operating the vacuum exhaust device until the pressure in the pressure regulating cavity is a first pressure value.
The beneficial effects that technical scheme that this application provided brought include:
the embodiment of the application provides a detection system and a control method of nano particles in ambient gas, wherein the application comprises the steps of opening a first control valve, and communicating a detection chamber with a pressure regulating chamber by using a second control valve; simultaneously starting a sampling pump and a vacuum exhaust device to a first set time so as to enable the inside of the detection chamber and the pressure regulating chamber to be filled with sampling gas under the condition of keeping normal pressure; closing the first control valve and the sampling pump, and then continuously operating the vacuum exhaust device until a second set time is reached so as to vacuumize the pressure regulating chamber; and closing the vacuum exhaust device, and detecting the nano particles in the ambient gas collected by the sampling assembly while opening the second control valve.
The detection principle is as follows: when the communication piece is opened, the detection chamber is communicated with the pressure regulating chamber. Because the pressure in the detection chamber is normal pressure and the pressure in the pressure regulating chamber is negative pressure, the pressure difference causes the pressure in the detection chamber to drop and work on the pressure regulating chamber, the molecular internal energy is reduced, in the process, nano particles in the detection chamber form condensation nuclei, so that invisible particles with the particle diameter of minimum to 0.002 mu m are amplified into detectable water droplets with the diameter range of 10 mu m-20 mu m; can be detected by the detection chamber.
The pressure value of the detection chamber and the pressure regulating chamber is always kept at normal pressure or negative pressure in the process of forming condensation nuclei by the nano particles, so that the sealing performance of the detection chamber and the pressure regulating chamber can be improved, frequent compressed gas is not needed in the mode, and the service life of the detection chamber is also improved to a certain extent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an overall structure of a detection system for nanoparticles in an ambient gas according to an embodiment of the present application;
fig. 2 is a schematic diagram of a first structure of a communication member in a first structure of communication between a detection chamber and a pressure regulating chamber according to an embodiment of the present application;
fig. 3 is a schematic view of a second structure of a communication member according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a second structure in which a detection chamber and a pressure regulating chamber provided in an embodiment of the present application are communicated;
FIG. 5 is a schematic view of the shape of the air outlet and air inlet of FIG. 4;
fig. 6 is a schematic diagram of the components of the system for N cycles of operation.
In the figure: 1. a sampling assembly; 2. a detection chamber; 3. a pressure regulating chamber; 4. a first filter; 5. a second filter; 6. a first control valve; 9. A communication member; 900. a connecting pipe; 901. a second control valve; 10. a vacuum pump; 11. a sampling pump; 12. an exhaust pump; 13. a pressure sensor.
Description of the embodiments
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
The embodiment of the application provides a detection system and a control method for nano particles in ambient gas, which are used for solving the problem that the service life of a detection cavity is influenced due to the fact that the detection cavity in the related technology needs to bear larger pressure periodically.
Referring to fig. 1, a system for detecting nanoparticles in an ambient gas includes:
the sampling assembly 1 is provided with a sampling pump 11 and is provided with two air outlets and an air inlet, and the air inlet is provided with a first filter 4; the sampling assembly 1 can be regarded as a pipe. The first filter 4 is used for coarse filtration of substances such as large-particle-size dust in the ambient gas.
A detection assembly having a detection chamber 2 and a pressure regulating chamber 3; the detection chamber 2 is connected with one air outlet of the sampling assembly 1 through a second filter 5 and a first control valve 6 which are connected in sequence; the second filter 5 is used for filtering particles larger than 300nm in the detection branch.
The detection chamber 2 is used for detecting nano particles in the environmental gas collected by the component 1; the pressure regulating chamber 3, at least one air flow channel which can be communicated or blocked through the second control valve 901 is formed between the air inlet of the pressure regulating chamber 3 and the air outlet of the detection chamber 2, that is, the communication part of the pressure regulating chamber 3 and the detection chamber 2 is also provided with the second control valve 901 for controlling the opening or closing of the air flow channel; the pressure regulating chamber 3 is provided with a vacuum exhaust device. The vacuum exhaust means comprises a vacuum pump 10 and/or an exhaust pump 12.
Through the above arrangement, the process used is:
opening the first control valve 6 and communicating the detection chamber 2 with the pressure regulating chamber 3 by the second control valve 901; simultaneously starting the sampling pump 11 and the vacuum exhaust device to a first set time so as to enable the inside of the detection chamber 2 and the pressure regulating chamber 3 to be full of sampling gas under the condition of keeping normal pressure; that is, the sampling pump 11 pumps the external gas into the sampling assembly, and one part of the external gas is discharged from the other outlet of the sampling assembly, the other part of the external gas is filtered by the second filter 5 and then enters the detection chamber 2, then finally enters the pressure regulating chamber 3, and then is discharged from the exhaust pump 12 or the vacuum pump 10, wherein, if the exhaust pump 12 does not exhaust, the gas inside the detection chamber 2 cannot be filled rapidly under normal pressure, and therefore, the exhaust pump 12 needs to intermittently sample the gas inside the detection chamber 2 and the pressure regulating chamber 3 to ensure that the gas is filled. The vacuum pump 10 and the exhaust pump 12 may be integrated. Specifically, the first set time is 2s to 4s, preferably 3s.
Closing the first control valve 6, the second control valve 901 and the sampling pump 11, and then continuing to operate the vacuum exhaust device for a second set time to vacuumize the inside of the pressure-regulating chamber 3; the vacuum exhaust device is turned off, and the second control valve 901 is turned on, and at the same time, nanoparticles in the ambient gas collected by the module 1 are detected, so as to perform particle detection. The second set time is 0.5s to 2s, preferably 1s.
The detection principle is as follows: when the second control valve 901 is opened, the detection chamber 2 and the pressure regulating chamber 3 communicate. Because the pressure in the detection chamber 2 is normal pressure and the pressure in the pressure regulating chamber 3 is negative pressure, the pressure difference causes the pressure in the detection chamber 2 to drop and the pressure regulating chamber 3 to work, the gas expands and the internal energy of molecules is reduced, in the process, nano particles in the detection chamber 2 form condensation nuclei, so that invisible particles with the particle diameter of minimum to 0.002 mu m are amplified into detectable water droplets with the diameter ranging from 10 mu m to 20 mu m; can be detected by the detection chamber. The nano particles which cannot be detected by the optical sensor originally are converted into condensation nucleus particles which can be detected by the optical sensor. And early warning of environmental fire is realized.
In the process of forming condensation nuclei by nano particles, the pressure values of the detection chamber 2 and the pressure regulating chamber 3 are always kept at normal pressure or negative pressure, so that the sealing performance of the detection chamber 2 and the pressure regulating chamber 3 can be ensured, frequent compressed gas is not needed in the mode, and the service life of the detection chamber 2 is prolonged to a certain extent.
In some preferred embodiments, the following two types of arrangement form are available for the detection chamber 2 and the pressure-adjusting chamber 3;
referring to fig. 2-3, in the first embodiment, the detecting chamber 2 and the pressure regulating chamber 3 are separately arranged and are communicated through a pipeline, and the specific structure is as follows: the detection chamber 2 and the pressure regulating chamber 3 are arranged at intervals, a chamber air outlet is formed in one side surface of the detection chamber 2, and a chamber air inlet corresponding to the chamber air outlet is formed in one side surface of the pressure regulating chamber 3 facing the detection chamber 2; the chamber air outlet is communicated with the chamber air inlet through a communicating piece 9 to form an air flow channel; wherein a second control valve 901 is provided on the communication member 9.
The communication piece 9 comprises two pipe groups which are respectively connected with the detection chamber 2 and the pressure regulating chamber 3; each tube set includes a plurality of connection tubes 900 distributed at equal intervals; the two tube sets are communicated through a second control valve 901. The air outlets of the detection chambers 2 and the air inlets of the pressure regulating chambers 3 are controlled by a valve, so that the product cost is low. At least 1 of the connection pipes 900. In the preferred embodiment, the connection pipes 900 are equally spaced in an even number, 2-8 in number.
The communication member 9 may also be provided as: the device comprises two tube groups which are respectively connected with a detection chamber 2 and a pressure regulating chamber 3; each tube set includes a plurality of connection tubes 900 distributed at equal intervals; the connection pipes 900 in the two pipe groups are in one-to-one correspondence, and the corresponding connection pipes 900 are connected by a second control valve 901. The air outlets of the detection chambers 2 and the air inlets of the pressure regulating chambers 3 are respectively and correspondingly controlled by a plurality of valves; the pressure release rate is faster, and the particle amplification effect is better.
Referring to fig. 4 to 5, in the second embodiment, the detection chamber 2 and the pressure regulating chamber 3 are integrated into one body, specifically:
a chamber air outlet is formed in one side surface of the detection chamber 2, and a chamber air inlet is formed in one side surface of the pressure regulating chamber 3 facing the detection chamber 2; the side surface of the detection chamber 2 with the chamber air outlet is abutted with the side surface of the pressure regulating chamber 3 with the chamber air inlet, and the two can relatively move; the detection system further comprises a driving structure, wherein the driving structure is fixedly connected with the detection chamber 2 or the pressure regulating chamber 3 so as to drive the detection chamber 2 and the pressure regulating chamber 3 to be communicated or disconnected with the chamber air outlet and the chamber air inlet when relatively moving; wherein the relative movement can be understood as: the driving structure drives the detection chamber 2 or the pressure regulating chamber 3 to move randomly in all directions of up, down, left, right, front and back, and in the moving process, a gap is formed between the chamber air outlet and the chamber air inlet.
Specifically, when the detection chamber 2 and the pressure regulating chamber 3 are communicated in the moving process, the chamber air outlet and the chamber air inlet are partially overlapped, and in the moving termination position, the chamber air outlet and the chamber air inlet are completely overlapped; when the detection chamber 2 and the pressure regulating chamber 3 are disconnected at the initial moving position, the air outlet of the chamber and the air inlet of the chamber are not coincident. That is, the chamber air outlet and the chamber air inlet are overlapped or hidden from each other by the driving structure, thereby communicating or blocking the detection chamber and the pressure regulating chamber. The cross sections of the detection chamber and the pressure regulating chamber in the design mode are shown in fig. 3, wherein a mark A is a chamber air outlet, and a mark B is a chamber air inlet.
Referring specifically to fig. 4 and 5, the side surface of the detection chamber 2 and the pressure regulating chamber 2, which are tightly connected, are in a complementary grid shape, when the detection chamber 2 and the pressure regulating chamber 3 are positioned at a first relative position, the chamber air outlet and the chamber air inlet are not coincident and are not communicated at this time, and when the detection chamber 2 and the pressure regulating chamber 3 are positioned at a second relative position, the chamber air outlet and the chamber air inlet are coincident and are communicated at this time; in particular, the chamber outlet and the cross section of the chamber outlet may be rectangular, circular, square or other shape.
In this design manner, since the whole particle amplifying structure is realized based on the principle of adjusting the pressure in the pressure-adjusting chamber 3 to make the inside of the detecting chamber 2 to draw negative pressure, when the chamber air outlet and the chamber air inlet overlap each other, the abutment of the side surface of the pressure-adjusting chamber 3 in contact with the detecting chamber will be tighter due to the negative pressure condition.
Further, the cavity volume of the detection chamber 2 is smaller than the cavity volume of the pressure regulating chamber 3, specifically, the ratio of the cavity volume of the detection chamber 2 to the cavity volume of the pressure regulating chamber 3 is
. The pressure in the pressure regulating chamber 3 is not obviously influenced when the gas in the detection chamber 2 diffuses to the pressure regulating chamber 3 at the moment of communicating the detection chamber 2 and the pressure regulating chamber 3, so that the nano particles in the environmental gas can fully form condensation cores.
In some preferred embodiments, the inner wall of the detection chamber 2 is provided with an anti-reflection layer; the outer walls of the detection chamber 2 and the pressure regulating chamber 3 are provided with heat insulation layers; the anti-reflection layer is made of pure black plastic material, so that the detection result is prevented from being influenced by reflection of detection light between the cavity wall surfaces. The heat insulating layer is made of heat insulating material with small heat conductivity coefficient, and the heat conductivity coefficient is less than or equal to 0.12W/(m.K), such as mineral wool, foamed ceramic heat insulating board and the like.
In some preferred embodiments, the system further comprises a buzzer for alerting in accordance with the concentration of the nanoparticles.
The pressure sensors 13 for detecting air pressure are arranged on the detection chamber 2 and the pressure regulating chamber 3, and important index parameters in the detection process are given through detection of the pressure values in the detection chamber 2 and the pressure regulating chamber 3, and specific operation steps are shown in the following specific embodiments.
The application also provides a control method of the detection system of the nano particles in the environmental gas, which comprises the following steps:
s01, opening the first control valve 6 and the second control valve 901 to communicate the air flow passage; simultaneously starting the sampling pump 11 and the vacuum exhaust device to a first set time so as to enable the inside of the detection chamber 2 and the pressure regulating chamber 3 to be full of sampling gas under the condition of keeping normal pressure;
s02, closing the first control valve 6, the second control valve 901 and the sampling pump 11, and then continuously operating the vacuum exhaust device for a second set time to vacuumize the pressure-regulating chamber 3;
s03, closing the vacuum exhaust device, opening the second control valve 901, and detecting the nano particles in the ambient gas collected by the sampling assembly.
Through the steps, the nano particles which cannot be detected by the optical sensor originally can be converted into condensation nucleus particles which can be detected by the optical sensor. And early warning of environmental fire is realized.
Further, step S02 may be replaced by: the first control valve 6, the second control valve 901 and the sampling pump 11 are closed, and then the vacuum exhaust device is continued to be operated until the pressure in the pressure-regulating chamber 3 is a first pressure value, which can be referred to later in the embodiments. The purpose of opening the second set time is also to reach the first pressure value. Specifically, the first pressure value is-70 Kpa to-50 Kpa.
The application also provides a specific embodiment:
(1) opening the first control valve 6 and the second control valve 901 to communicate the detection chamber 2 and the pressure regulating chamber 3 with the communication member 9; simultaneously starting the sampling pump 11 and the exhaust pump 12 to t1 seconds to fill the detection cavity and the pressure regulating cavity with sampling gas under the condition of keeping normal pressure; t1=3s in the preferred embodiment.
(2) Closing the first control valve 6, the second control valve 901, the sampling pump 11 and the exhaust pump 12, then starting the vacuum pump for 10 to t2 seconds, vacuumizing the pressure regulating cavity, namely starting the vacuum pump, and adjusting the pressure value in the pressure regulating cavity to be-70 kPa to-50 kPa, so as to provide conditions for detecting the gas expansion in the cavity; t2=1s in the preferred embodiment.
(3) The vacuum pump 10 is turned off, the second control valve 901 is turned on, and nanoparticles in the ambient gas collected by the sampling assembly are detected while the second control valve 901 is turned on. Intermittent cycling is performed N times in sequence.
Under N working cycles, the conditions of all parts of the system are shown in fig. 6, wherein p1 is normal pressure, and p2 is negative pressure; stopping pumping when the pressure in the pressure regulating chamber 3 reaches to-50 kPa by the vacuum pump 10; exhaust flow rates of the exhaust pump 12 and the vacuum pump 10: 4L/min; volume ratio of the detection chamber 2 to the pressure regulating chamber 3: 1:6, preparing a base material; the volume of the detection cavity is about 0.0009 m wave, and the volume of the pressure regulating cavity is about 0.006m wave; t1=3s; t2=1s; t=8s; the method also calculates according to the volumes of the detection cavity and the pressure regulating cavity and the exhaust flow, and comprehensively considers the parameters of the time interval obtained by the actual demands.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A system for detecting nanoparticles in an ambient gas, comprising:
a sampling assembly (1) on which a sampling pump (11) is arranged and which has two air outlets and an air inlet, the air inlet being provided with a first filter (4);
a detection assembly having a detection chamber (2) and a pressure regulating chamber (3);
wherein the detection chamber (2) is connected with one air outlet of the sampling assembly (1) through a second filter (5) and a first control valve (6) which are sequentially connected; the detection chamber (2) is used for detecting nano particles in the ambient gas collected by the sampling assembly (1);
the pressure regulating chamber (3) is connected with a vacuum exhaust device; at least one air flow channel which can be communicated or blocked through a second control valve (901) is formed between the air inlet of the pressure regulating chamber (3) and the air outlet of the detection chamber (2).
2. The system for detecting nanoparticles in an ambient gas as recited in claim 1, wherein:
the detection chamber (2) and the pressure regulating chamber (3) are arranged at intervals, a chamber air outlet is formed in one side surface of the detection chamber (2), and a chamber air inlet corresponding to the chamber air outlet is formed in one side surface of the pressure regulating chamber (3) facing the detection chamber (2);
the chamber air outlet is communicated with the chamber air inlet through a communicating piece (9) so as to form the air flow channel;
wherein the second control valve (901) is arranged on the communicating piece (9).
3. The system for detecting nanoparticles in an ambient gas as recited in claim 1, wherein:
a chamber air outlet is formed in one side surface of the detection chamber (2), and a chamber air inlet is formed in one side surface of the pressure regulating chamber (3) facing the detection chamber (2); the side surface of the detection chamber (2) with the chamber air outlet is abutted with the side surface of the pressure regulating chamber (3) with the chamber air inlet ， And the two can relatively move;
the detection system further comprises a driving structure, wherein the driving structure is fixedly connected with the detection chamber (2) or the pressure regulating chamber (3) so as to drive the detection chamber (2) and the pressure regulating chamber (3) to be communicated or disconnected with the air outlet of the chamber and the air inlet of the chamber when the detection chamber and the pressure regulating chamber are relatively moved.
4. A system for detecting nanoparticles in an ambient gas as claimed in any one of claims 1 to 3, wherein:
the cavity volume of the detection chamber (2) is smaller than the cavity volume of the pressure regulating chamber (3).
5. The system for detecting nanoparticles in an ambient gas as recited in claim 4, wherein:
the cavity volume ratio of the detection cavity (2) to the pressure regulating cavity (3) is 1/6-1/2.
6. The system for detecting nanoparticles in an ambient gas as recited in claim 1, wherein:
an anti-reflection layer is arranged on the inner wall of the detection chamber (2); and heat insulation layers are arranged on the outer walls of the detection chamber (2) and the pressure regulating chamber (3).
7. The system for detecting nanoparticles in an ambient gas as recited in claim 1, wherein:
and the detection chamber (2) and the pressure regulating chamber (3) are respectively provided with a pressure sensor (13) for detecting air pressure.
8. A method of controlling a system for detecting nanoparticles in an ambient gas as claimed in claim 1, comprising the steps of:
s01, opening the first control valve (6) and the second control valve (901) so as to communicate with the air flow channel; simultaneously starting the sampling pump (11) and the vacuum exhaust device to a first set time so as to enable the inside of the detection chamber (2) and the pressure regulating chamber (3) to be filled with sampling gas under the condition of keeping normal pressure;
s02, closing the first control valve (6), the second control valve (901) and the sampling pump (11), and then continuously operating the vacuum exhaust device for a second set time to vacuumize the pressure regulating chamber (3);
s03, closing the vacuum exhaust device, opening a second control valve (901), and detecting nano particles in the ambient gas collected by the sampling assembly (1).
9. A method for controlling a system for detecting nanoparticles in an ambient gas according to claim 8,
the first setting time is 2 s-4 s;
the second set time is 0.5 s-2 s.
10. The method of controlling a nanoparticle detection system in an ambient gas according to claim 8, wherein the step S02 is replaced by:
the first control valve (6), the second control valve (901) and the sampling pump (11) are closed, and then the vacuum exhaust device is continuously operated until the pressure in the pressure regulating chamber (3) is a first pressure value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211379608.0A CN116124656A (en) | 2022-11-04 | 2022-11-04 | Detection system for nano particles in ambient gas and control method thereof |
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| CN202211379608.0A CN116124656A (en) | 2022-11-04 | 2022-11-04 | Detection system for nano particles in ambient gas and control method thereof |
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| CN116124656A true CN116124656A (en) | 2023-05-16 |
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| CN202211379608.0A Pending CN116124656A (en) | 2022-11-04 | 2022-11-04 | Detection system for nano particles in ambient gas and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116124656A (en) |
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2022
- 2022-11-04 CN CN202211379608.0A patent/CN116124656A/en active Pending
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