CN108680403B - Pressure-flow-type multistage submicron particle collector - Google Patents
Pressure-flow-type multistage submicron particle collector Download PDFInfo
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- CN108680403B CN108680403B CN201810640412.XA CN201810640412A CN108680403B CN 108680403 B CN108680403 B CN 108680403B CN 201810640412 A CN201810640412 A CN 201810640412A CN 108680403 B CN108680403 B CN 108680403B
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- 239000002245 particle Substances 0.000 title claims abstract description 50
- 238000000926 separation method Methods 0.000 claims abstract description 46
- 230000001133 acceleration Effects 0.000 claims description 34
- 125000006850 spacer group Chemical group 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 abstract description 12
- 239000003570 air Substances 0.000 description 86
- 239000010419 fine particle Substances 0.000 description 9
- 239000011362 coarse particle Substances 0.000 description 7
- 239000000443 aerosol Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000013618 particulate matter Substances 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
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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
- G01N1/2208—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with impactors
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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
- G01N1/2273—Atmospheric sampling
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Abstract
The invention discloses an additional pressure flow type multistage submicron particle collector, which comprises a collector body, and a primary air inlet cavity, a primary separation cavity, a primary collection cavity and a secondary collection chamber which are sequentially arranged in the collector body from top to bottom; the first-stage air inlet cavity is provided with a first-stage air inlet channel for the sample air to enter, and a first-stage pressure flow channel I and a first-stage pressure flow channel II which are respectively arranged at the left side and the right side of the first-stage air inlet channel, a first transverse flow channel is arranged below an air outlet of the first-stage air inlet channel, and the left end and the right end of the first transverse flow channel are respectively communicated with the first-stage pressure flow channel I and the first-stage pressure flow channel II; the invention can avoid the direct contact between the sampling air and the inner wall of the collector body, thereby reducing wall loss, improving the collection efficiency, improving the precision of particle diameter of the collected particles and achieving the efficient separation of submicron particles.
Description
Technical Field
The invention relates to a virtual impactor, in particular to an additional pressure flow type multistage submicron particle collector.
Background
In the monitoring of the atmosphere and industrial environment, before determining the source of the particulate matter and evaluating the harm or potential harm of the particulate matter to human beings and the environment, the components, the particle concentration and the particle size distribution of the aerosol particulate matter are required to be dissolved, so that the aerosol is required to be sampled, classified and detected and analyzed in advance, and the harmful particles in the environment can be early warned. The importance of the requirement is also reflected in the process of emergency, and in order to ensure that first-line rescue workers can timely know the current situation and make accurate judgment, the environmental threat needs to be acquired, analyzed and processed by a certain technical means. An important instrument used in the field of aerosol technology is an inertial impactor (also called collector), which is designed based on the principle of inertia; in order to solve the problems of particle loss, poor separation characteristics and the like caused by the principle defects of the inertial impactor, a virtual impact principle is proposed, and the impactor designed according to the virtual impact principle is called a virtual impactor.
The virtual impactor principle can be summarized as: by utilizing the difference of inertial force of particles with different particle diameters in the sampling flow, coarse particles with large inertia can maintain the original movement direction to enter the secondary flow when passing through a cutting point (a flow diversion position), and fine particles are changed into the main flow due to small inertia. The function of separating and collecting particles in the air according to the difference of the particle sizes can be realized by utilizing the principle. However, the conventional virtual impactor is poor in particle loss control, and is mainly characterized by large wall loss, so that the acquisition efficiency is low.
Disclosure of Invention
In view of the above, the invention aims to provide an additional pressurized flow type multistage submicron particle collector, which can avoid direct contact between sampling air and the inner wall of a collector body, thereby reducing wall loss, improving collection efficiency, improving the precision of particle diameter of collected particles, and achieving high-efficiency separation of submicron particles.
The invention relates to an additional pressurized flow type multistage submicron particle collector, which comprises a collector body, and a primary air inlet cavity, a primary separation cavity, a primary collection cavity and a secondary collection chamber which are sequentially arranged in the collector body from top to bottom;
the first-stage air inlet cavity is provided with a first-stage air inlet channel for the sample air to enter, and a first-stage pressure flow channel I and a first-stage pressure flow channel II which are respectively arranged at the left side and the right side of the first-stage air inlet channel, a first transverse flow channel is arranged below an air outlet of the first-stage air inlet channel, and the left end and the right end of the first transverse flow channel are respectively communicated with the first-stage pressure flow channel I and the first-stage pressure flow channel II;
the first-stage separation cavity is provided with a first-stage acceleration channel and a first-stage pressure flow channel III positioned on the right side of the first-stage acceleration channel, the first-stage acceleration channel is communicated with the first transverse flow channel, an air inlet of the first-stage acceleration channel is arranged right below an air outlet of the first-stage air inlet channel, the upper end of the first-stage pressure flow channel III is communicated with the right end of the first transverse flow channel and is arranged right below the first-stage pressure flow channel II, a second transverse flow channel is arranged below the air outlet of the first-stage acceleration channel, and the right end of the second transverse flow channel is communicated with the first-stage pressure flow channel III;
the primary collection cavity is provided with a primary secondary flow channel and a primary main flow channel positioned at the left side of the primary secondary flow channel, and a primary collection port is arranged at the tail end of the collector body corresponding to the primary secondary flow channel; the left end of the second transverse flow channel is communicated with the primary main flow channel; a second-stage air inlet channel is formed around the outer side of the first-stage secondary flow channel, and a third transverse flow channel is arranged below an air outlet of the second-stage air inlet channel;
the secondary acquisition chamber is provided with a secondary acceleration channel, a secondary pressure flow channel I and a secondary pressure flow channel II which are respectively positioned at the left side and the right side of the secondary acceleration channel, the secondary acceleration channel is communicated with a third transverse flow channel, an air inlet of the secondary acceleration channel is arranged right below an air outlet of the secondary air inlet channel, and the left end and the right end of the third transverse flow channel are respectively communicated with the secondary pressure flow channel I and the secondary pressure flow channel II; the air outlet of the secondary accelerating channel is provided with a secondary flow channel, a fourth transverse flow channel is arranged between the secondary accelerating channel and the secondary flow channel, the left end of the fourth transverse flow channel is communicated with the secondary main flow channel, and the right end of the fourth transverse flow channel is communicated with the secondary pressure flow channel II.
Through the further improvement to above-mentioned technical scheme, the collector body includes from last first box, second box, third box and the fourth box that connects gradually down, first box is located to the one-level chamber that advances, the second box is located to the one-level separation chamber, the third box is located to the one-level chamber that gathers, the fourth box is located to the second level chamber that gathers.
Through the further improvement to the technical scheme, the first box body, the second box body, the third box body and the fourth box body are fixedly connected through bolts or are integrally formed.
Through further improvement of the technical scheme, the first baffle I and the first baffle II are symmetrically arranged on the first box body, a first-stage air inlet channel is formed between the first baffle I and the first baffle II, longitudinal sections of the first baffle I and the first baffle II are L-shaped, and transverse parts of the first baffle I and the first baffle II incline downwards towards the inner side, so that the first-stage air inlet channel is funnel-shaped; a first-stage pressure flow channel I is formed between the first baffle I and the left side wall of the first box body, and a first-stage pressure flow channel II is formed between the first baffle II and the right side wall of the first box body.
Through the further improvement to above-mentioned technical scheme, install second baffle I and second baffle II on the second box, second baffle I and the left side wall sealing connection of second box, form vertical one-level acceleration channel between second baffle I and the second baffle II, form one-level pressure flow channel III between second baffle II and the right side wall of second box.
Through further improvement of the technical scheme, the third baffle I and the third baffle II are symmetrically arranged on the third box body, the third baffle I is fixed on the left side wall of the third box body, and the third baffle II is fixed on the right side wall of the third box body; the secondary air inlet channel is formed between the third baffle I and the third baffle II, the longitudinal sections of the third baffle I and the third baffle II are L-shaped, and the transverse parts of the third baffle I and the third baffle II incline downwards towards the inner side, so that the secondary air inlet channel is funnel-shaped.
Through further improvement of the technical scheme, a primary collecting plate with a U-shaped longitudinal section is further arranged on the third box body, and a primary secondary flow channel is formed in the inner cavity of the primary collecting plate; the left side wall of the primary collection plate extends outwards along the horizontal direction and forms a primary main flow channel with the third baffle I; the right side wall of the first-stage collecting plate extends outwards along the horizontal direction and is in sealing connection with the third baffle II.
Through further improvement of the technical scheme, a fourth baffle I and a fourth baffle II are arranged on the fourth box body, a separation spacer I is arranged below the fourth baffle I, and a separation spacer II is arranged below the fourth baffle II; the novel high-pressure flow-rate air conditioner is characterized in that a secondary flow-rate channel I is formed between the fourth baffle I and the left side wall of the fourth box body, a secondary flow-rate channel II is formed between the fourth baffle II and the right side wall of the fourth box body and between the separation spacer II and the right side wall of the fourth box body, a vertical secondary acceleration channel is formed between the fourth baffle I and the fourth baffle II, a secondary flow channel is formed between the separation spacer I and the separation spacer II, and a secondary main flow channel is formed between the separation spacer I and the fourth baffle I.
According to the additional pressure flow type multistage submicron particle collector disclosed by the invention, the direct contact between the sampling air and the inner wall of the collector body can be avoided, so that the wall loss is effectively reduced, the collection efficiency is improved, the precision of particle size of the collected particles can be improved, and the submicron particles can be effectively separated.
Specifically:
in the first-stage air inlet cavity, a first-stage air inlet channel is funnel-shaped, and mixed sampling air containing coarse and fine particles is accelerated to enter the system through the first-stage air inlet channel; a first-stage pressure flow channel I is arranged on the left side of the first-stage air inlet channel, and pressure flow in the first-stage pressure flow channel I is converged with sampling air at the tail end; the first-stage pressure flow channel II on the right side of the first-stage air inlet channel is a channel with double outlets, wherein the outlet on the upper part is kept horizontal with the first-stage pressure flow channel I, the effect of extruding sampling air flow is achieved, the outlet on the lower part is located at a cutting point to form a side flow, and the flow direction of fine particles in the sampling air is changed by utilizing the impact force of the side flow and the inertia force of the particles, so that particles with different particle diameters in the sampling air are separated and collected.
In the primary separation chamber, the inlet air is subjected to the side impact force of a side flow, part of air of fine particles (< 2.5 mu m) is diverted into a primary main flow channel, and the other part of air of coarse particles (2.5 mu m-10 mu m) is influenced by the inertia force to continuously vertically downwards in the primary secondary flow channel along the original direction; the first separation of the sample air is accomplished in the first stage separation chamber, and the sample air will be initially separated into coarse and fine particles.
In the first-stage collection cavity, part of gas in the first-stage main flow channel enters the second-stage collector; the gas in the primary secondary channel part is collected through a primary collection port of the third box body and is discharged out of the system.
The part of the primary collection cavity and the secondary collection chamber form a secondary impact system, so that partial gas of the primary main flow channel can be separated again, submicron particles (< 1 mu m) are further separated, and the high-efficiency separation and collection of the submicron particles are ensured by continuously utilizing the pressure flow.
The structure design of the invention realizes the multilevel of the multilevel submicron particle collector with the additional pressurized flow, has simple structure, can well protect the collected air flow by the pressurized flow, avoids direct contact with the wall of the structure surface, and has high separation efficiency; the two stages are connected in series, so that the sampled air can be separated in multiple stages, submicron particles can be efficiently separated and collected by the second stage on the basis of the first stage, and the separation characteristic is good; in addition, in order to improve the collection flow, the collection analysis to the ambient air is more timely, and this impacter can also connect in parallel to improve the separation and gather the flow.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the internal gas flow when the present invention is in use;
FIG. 3 is a perspective view of the collector body of the present invention;
FIG. 4 is a perspective view of the first housing of the present invention;
FIG. 5 is a cross-sectional view of a first housing of the present invention;
FIG. 6 is a perspective view of a second housing of the present invention;
FIG. 7 is a cross-sectional view of a second housing of the present invention;
fig. 8 is a perspective view of a third case of the present invention;
FIG. 9 is a combination view of a third baffle I and a third baffle II of the present invention;
FIG. 10 is a cross-sectional view of a third housing of the present invention;
FIG. 11 is a perspective view of the fourth housing of the present invention;
fig. 12 is a schematic diagram showing the connection of the three cases to the fourth case according to the present invention.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 12: the additional pressurized flow type multistage submicron particle collector in the embodiment comprises a collector body, and a primary air inlet cavity 101, a primary separation cavity 201, a primary collection cavity 301 and a secondary collection chamber 401 which are sequentially arranged inside the collector body from top to bottom. The collector body comprises a first box body 1, a second box body 2, a third box body 3 and a fourth box body 4 which are sequentially connected from top to bottom, the first box body 1 is arranged in the first-stage air inlet cavity 101, the second box body 2 is arranged in the first-stage separation cavity 201, the third box body 3 is arranged in the first-stage collecting cavity 301, and the fourth box body 4 is arranged in the second-stage collecting cavity 401. The first box body 1, the second box body 2, the third box body 3 and the fourth box body 4 can be connected in a detachable connection mode to form a collector body, so that the collector is convenient to install and detach; for example, a flange-like structure may be provided between the bottom surface of the first casing 1 and the top surface of the second casing 2, between the bottom surface of the second casing 2 and the top surface of the third casing 3, and between the bottom surface of the third casing 3 and the top surface of the fourth casing 4, and the connection may be performed by fixing bolts, and of course, the tightness of each connection should be considered during the connection, so as to prevent air leakage. Of course, the collector body may also be of an integral structure, so that the processing is convenient, the sealing performance is improved, and at this time, the first case 1, the second case 2, the third case 3 and the fourth case 4 are integrally formed, for example, by casting.
The primary air inlet cavity 101 is provided with a primary air inlet channel 102 for the sample air to enter, and a primary pressure flow channel I103 and a primary pressure flow channel II 104 which are respectively arranged at the left side and the right side of the primary air inlet channel 102, a first transverse flow channel 105 is arranged below an air outlet of the primary air inlet channel 102, and the left end and the right end of the first transverse flow channel 105 are respectively communicated with the primary pressure flow channel I103 and the primary pressure flow channel II 104; the left and right directions are all in accordance with the directions shown in fig. 1; the first-stage pressure flow channel I103 and the first-stage pressure flow channel II 104 are both vertical channel structures, and the first transverse flow channel 105 is a horizontal flow channel structure; the primary pressure flow channel I103, the first transverse flow channel 105 and the primary pressure flow channel II 104 are connected to form a U-shaped structure, and the primary air inlet channel 102 is wrapped in the U-shaped structure. The first-stage air inlet cavity 101 is formed by a first box body 1, preferably, a first baffle I11 and a first baffle II 12 are symmetrically arranged on the first box body 1, a first-stage air inlet channel 102 is formed between the first baffle I11 and the first baffle II 12, longitudinal sections of the first baffle I11 and the first baffle II 12 are L-shaped, and transverse parts of the first baffle I11 and the first baffle II 12 incline downwards towards the inner side, so that the first-stage air inlet channel 102 is in a funnel shape; a primary pressure flow channel I103 is formed between the first baffle I11 and the left side wall of the first box body 1, and a primary pressure flow channel II 104 is formed between the first baffle II 12 and the right side wall of the first box body 1; the first baffle I11 and the first baffle II 12 can be positioned and installed through the grooves formed in the opening part of the first box body 1.
The primary separation cavity 201 is provided with a primary acceleration channel 202 and a primary pressure flow channel III 203 positioned on the right side of the primary acceleration channel 202, the primary acceleration channel 202 is communicated with the first transverse flow channel 105, an air inlet of the primary acceleration channel is arranged right below an air outlet of the primary air inlet channel 102, the upper end of the primary pressure flow channel III 203 is communicated with the right end of the first transverse flow channel 105 and is arranged right below the primary pressure flow channel II 104, a second transverse flow channel 204 is arranged below the air outlet of the primary acceleration channel 202, and the right end of the second transverse flow channel 204 is communicated with the primary pressure flow channel III 203; the primary pressure flow channel III 203 is of a vertical channel structure, and the second transverse flow channel 204 is of a horizontal flow channel structure. The primary separation chamber 201 is formed by a second box body 2, preferably, a second baffle I21 and a second baffle II 22 are installed on the second box body 2, the second baffle I21 is in sealing connection with the left side wall of the second box body 2, a vertical primary acceleration channel 202 is formed between the second baffle I21 and the second baffle II 22, and a primary pressure flow channel III 203 is formed between the second baffle II 22 and the right side wall of the second box body 2; the second baffle I21 and the second baffle II 22 can be positioned and installed through the grooves arranged at the opening part of the second box body 2.
The primary collection cavity 301 is provided with a primary secondary flow channel 302 and a primary main flow channel 303 positioned at the left side of the primary secondary flow channel 302, and a primary collection port 304 is arranged at the tail end of the collector body corresponding to the primary secondary flow channel 302; the left end of the second transverse flow channel 204 is communicated with a primary main flow channel 303; a secondary air inlet channel 305 is formed around the outer side of the primary secondary channel 302, and a third transverse flow channel 306 is arranged below the air outlet of the secondary air inlet channel 305; the primary main flow channel 303 may be part of the secondary intake channel 305. The first-stage collection cavity 301 is formed by a third box body 3, and preferably, a third baffle I31 and a third baffle II 32 are symmetrically arranged on the third box body 3, the third baffle I31 is fixed on the left side wall of the third box body 3, and the third baffle II 32 is fixed on the right side wall of the third box body 3; a secondary air inlet channel 305 is formed between the third baffle I31 and the third baffle II 32, longitudinal sections of the third baffle I31 and the third baffle II 32 are L-shaped, and transverse parts of the third baffle I31 and the third baffle II are inclined downwards towards the inner side, so that the secondary air inlet channel 305 is funnel-shaped; the secondary air intake channel 305 encloses the primary secondary flow channel 302; the third baffle I31 and the third baffle II 32 can be positioned and installed through the groove 3a arranged at the opening 3b of the third box body 3; a primary collection plate 33 with a U-shaped longitudinal section is also arranged on the third box body 3, and a primary secondary channel 302 is formed in the inner cavity of the primary collection plate 33; the left side wall of the primary collection plate 33 extends outwards along the horizontal direction and forms a primary main flow channel 303 with the third baffle I31; the right side wall of the first-stage collecting plate 33 extends outwards along the horizontal direction and is in sealing connection with the third baffle II 32.
The secondary acquisition chamber 401 is provided with a secondary acceleration channel 402, and a secondary pressure flow channel I403 and a secondary pressure flow channel II 404 which are respectively positioned at the left side and the right side of the secondary acceleration channel 402, wherein the secondary acceleration channel 402 is communicated with the third transverse flow channel 306, an air inlet of the secondary acceleration channel is arranged right below an air outlet of the secondary air inlet channel 305, and the left end and the right end of the third transverse flow channel 306 are respectively communicated with the secondary pressure flow channel I403 and the secondary pressure flow channel II 404; a secondary flow channel 405 is further arranged right below the air outlet of the secondary acceleration channel 402, a fourth transverse flow channel 406 is arranged between the secondary acceleration channel 402 and the secondary flow channel 405, the left end of the fourth transverse flow channel 406 is communicated with a secondary main flow channel 407, and the right end of the fourth transverse flow channel 406 is communicated with a secondary pressure flow channel II 404; the second-stage pressure flow channel I403 and the second-stage pressure flow channel II 404 are vertical channels, and the third transverse flow channel 306 and the fourth transverse flow channel 406 are horizontal channels; the second-stage collection chamber 401 is formed by a fourth box body 4, preferably, a fourth baffle I41 and a fourth baffle II 42 are installed on the fourth box body 4, a separation spacer I43 is arranged below the fourth baffle I41, and a separation spacer II 44 is arranged below the fourth baffle II 42; a secondary pressure flow channel I403 is formed between the fourth baffle I41 and the left side wall of the fourth box body 4, a secondary pressure flow channel II 404 is formed between the fourth baffle II 42 and the right side wall of the fourth box body 4 and between the separation spacer II 44 and the right side wall of the fourth box body 4, a vertical secondary accelerating channel 402 is formed between the fourth baffle I41 and the fourth baffle II 42 and between the separation spacer I43 and the separation spacer II 44, a secondary flow channel 405 is formed between the separation spacer I43 and the fourth baffle I41; the fourth baffle I41 and the fourth baffle II 42 can be positioned and installed through the grooves at the opening part of the fourth box body 4; the separation block I43 and the separation block II 44 can be fixed on the fourth box body 4 through bolt fasteners or mounted on the bottom box.
The adoption of the additional pressurized flow type multistage submicron particle collector can avoid the direct contact between the sampling air and the inner wall of the collector body, thereby effectively reducing the wall loss, improving the collection efficiency, improving the precision of particle diameter of the collected particles and achieving the efficient separation of submicron particles.
Specifically:
in the primary air inlet cavity 101, a primary air inlet channel 102 is funnel-shaped, and mixed sampling air containing coarse and fine particles is accelerated into the system through the primary air inlet channel 102 (arrows in fig. 2 are gas flow directions); a primary pressure flow channel I103 is arranged on the left side of the primary air inlet channel 102, and the pressure flow in the primary pressure flow channel I103 is converged with sampling air at the tail end; the primary pressure flow channel II 104 on the right side of the primary air inlet channel 102 is a channel with double outlets, wherein the outlet on the upper part and the primary pressure flow channel I103 are kept horizontal, so as to achieve the effect of extruding the sampled air flow, the outlet on the lower part is positioned at the cutting point to form a side flow, and the impact force of the side flow and the inertia force of particles are utilized to change the flowing direction of fine particles in the sampled air, thereby separating and collecting particles with different particle diameters in the air.
In the primary separation chamber 201, the inlet air is subjected to the side impact force of the side flow, part of the air of the fine particles (< 2.5 μm) is diverted into the primary main flow channel 303, and the other part of the influence of the inertial force of the coarse particles (2.5 μm-10 μm) is continuously vertically downwards in the primary secondary flow channel 302 along the original direction; the first separation of the sample air is accomplished in the first stage separation chamber 201, and the sample air will be initially separated into coarse and fine particles.
In the primary collection chamber 301, a portion of the primary main flow channel 303 will enter the secondary collector; part of the gas in the primary secondary channel 302 is collected through the primary collection port of the third box 3 and is discharged out of the system.
The portion of the primary collection chamber 301 and the secondary collection chamber 401 form a secondary impact system, which can separate a portion of the gas in the primary main flow channel 303 again, further separate submicron particles (< 1 μm), and continue to utilize the pressure flow to ensure high-efficiency separation and collection thereof.
The structural design of the impactor realizes the multistage of the virtual impactor, has a simple structure, can separate sampled air in multiple stages by connecting two stages in series, and can efficiently separate and collect submicron particles on the basis of the first stage, and the separation characteristic is good; in addition, in order to improve the collection flow, the collection analysis to the ambient air is more timely, and this impacter can also connect in parallel to improve the separation and gather the flow.
Finally, it is pointed out that the principles and embodiments of the invention have been described herein with reference to specific examples, which are intended to be merely illustrative of the core idea of the invention, and that several improvements and modifications can be made to the invention without departing from the principles of the invention, which also fall within the scope of protection of the invention.
Claims (8)
1. An additional pressure flow type multistage submicron particle collector is characterized in that: the device comprises a collector body, a primary air inlet cavity, a primary separation cavity, a primary collection cavity and a secondary collection chamber which are sequentially arranged in the collector body from top to bottom;
the first-stage air inlet cavity is provided with a first-stage air inlet channel for the sample air to enter, and a first-stage pressure flow channel I and a first-stage pressure flow channel II which are respectively arranged at the left side and the right side of the first-stage air inlet channel, a first transverse flow channel is arranged below an air outlet of the first-stage air inlet channel, and the left end and the right end of the first transverse flow channel are respectively communicated with the first-stage pressure flow channel I and the first-stage pressure flow channel II;
the first-stage separation cavity is provided with a first-stage acceleration channel and a first-stage pressure flow channel III positioned on the right side of the first-stage acceleration channel, the first-stage acceleration channel is communicated with the first transverse flow channel, an air inlet of the first-stage acceleration channel is arranged right below an air outlet of the first-stage air inlet channel, the upper end of the first-stage pressure flow channel III is communicated with the right end of the first transverse flow channel and is arranged right below the first-stage pressure flow channel II, a second transverse flow channel is arranged below the air outlet of the first-stage acceleration channel, and the right end of the second transverse flow channel is communicated with the first-stage pressure flow channel III;
the primary collection cavity is provided with a primary secondary flow channel and a primary main flow channel positioned at the left side of the primary secondary flow channel, and a primary collection port is arranged at the tail end of the collector body corresponding to the primary secondary flow channel; the left end of the second transverse flow channel is communicated with the primary main flow channel; a second-stage air inlet channel is formed around the outer side of the first-stage secondary flow channel, and a third transverse flow channel is arranged below an air outlet of the second-stage air inlet channel;
the secondary acquisition chamber is provided with a secondary acceleration channel, a secondary pressure flow channel I and a secondary pressure flow channel II which are respectively positioned at the left side and the right side of the secondary acceleration channel, the secondary acceleration channel is communicated with a third transverse flow channel, an air inlet of the secondary acceleration channel is arranged right below an air outlet of the secondary air inlet channel, and the left end and the right end of the third transverse flow channel are respectively communicated with the secondary pressure flow channel I and the secondary pressure flow channel II; a second secondary flow channel is further arranged right below the air outlet of the second accelerating channel, a fourth transverse flow channel is arranged between the second accelerating channel and the second secondary flow channel, the left end of the fourth transverse flow channel is communicated with the second primary flow channel, and the right end of the fourth transverse flow channel is communicated with the second pressure flow channel II;
the first-stage pressure flow channel I and the first-stage pressure flow channel II are both of vertical channel structures, and the first transverse flow channel is of a horizontal flow channel structure.
2. The attached pressurized flow multistage submicron particle collector according to claim 1, characterized in that: the collector body comprises a first box body, a second box body, a third box body and a fourth box body which are sequentially connected from top to bottom, the first box body is arranged in the first-stage air inlet cavity, the second box body is arranged in the first-stage separation cavity, the third box body is arranged in the first-stage collection cavity, and the fourth box body is arranged in the second-stage collection cavity.
3. The attached pressurized flow multistage submicron particle collector according to claim 2, characterized in that: the first box body, the second box body, the third box body and the fourth box body are fixedly connected through bolts or integrally formed.
4. The attached pressurized flow multistage submicron particle collector according to claim 2, characterized in that: the first box body is symmetrically provided with a first baffle I and a first baffle II, a first-stage air inlet channel is formed between the first baffle I and the first baffle II, longitudinal sections of the first baffle I and the first baffle II are L-shaped, and transverse parts of the first baffle I and the first baffle II incline downwards towards the inner side, so that the first-stage air inlet channel is funnel-shaped; a first-stage pressure flow channel I is formed between the first baffle I and the left side wall of the first box body, and a first-stage pressure flow channel II is formed between the first baffle II and the right side wall of the first box body.
5. The attached pressurized flow multistage submicron particle collector according to claim 4, characterized in that: install second baffle I and second baffle II on the second box, second baffle I and the left side wall sealing connection of second box, form vertical one-level acceleration channel between second baffle I and the second baffle II, form one-level pressure flow channel III between second baffle II and the right side wall of second box.
6. The attached pressurized flow multistage submicron particle collector according to claim 5, characterized in that: the third box body is symmetrically provided with a third baffle I and a third baffle II, the third baffle I is fixed on the left side wall of the third box body, and the third baffle II is fixed on the right side wall of the third box body; the secondary air inlet channel is formed between the third baffle I and the third baffle II, the longitudinal sections of the third baffle I and the third baffle II are L-shaped, and the transverse parts of the third baffle I and the third baffle II incline downwards towards the inner side, so that the secondary air inlet channel is funnel-shaped.
7. The attached pressurized flow multistage submicron particle collector according to claim 6, characterized in that: the third box body is also provided with a primary collection plate with a U-shaped longitudinal section, and the inner cavity of the primary collection plate forms a primary secondary flow channel; the left side wall of the primary collection plate extends outwards along the horizontal direction and forms a primary main flow channel with the third baffle I; the right side wall of the first-stage collecting plate extends outwards along the horizontal direction and is in sealing connection with the third baffle II.
8. The additional pressure flow type multi-stage submicron particle collector according to claim 7, characterized in that: the novel separating device comprises a first box body, a second box body, a first baffle and a second baffle, wherein the first baffle is arranged on the first box body, a separating spacer block I is arranged below the first baffle, and a separating spacer block II is arranged below the second baffle; the novel high-pressure flow-rate air conditioner is characterized in that a secondary flow-rate channel I is formed between the fourth baffle I and the left side wall of the fourth box body, a secondary flow-rate channel II is formed between the fourth baffle II and the right side wall of the fourth box body and between the separation spacer II and the right side wall of the fourth box body, a vertical secondary acceleration channel is formed between the fourth baffle I and the fourth baffle II, a secondary flow channel is formed between the separation spacer I and the separation spacer II, and a secondary main flow channel is formed between the separation spacer I and the fourth baffle I.
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| CN109470532A (en) * | 2019-01-21 | 2019-03-15 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | A kind of taper single tube mouth sampling system with second level shielding case |
| CN113532966B (en) * | 2021-07-07 | 2022-04-26 | 北京大学 | Automatic multi-stage single-particle impact type sampler and sampling method |
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