CN112881103A - Micro sampling flow control device - Google Patents
Micro sampling flow control device Download PDFInfo
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- CN112881103A CN112881103A CN202110050490.6A CN202110050490A CN112881103A CN 112881103 A CN112881103 A CN 112881103A CN 202110050490 A CN202110050490 A CN 202110050490A CN 112881103 A CN112881103 A CN 112881103A
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- 238000005070 sampling Methods 0.000 title claims abstract description 111
- 229920000742 Cotton Polymers 0.000 claims abstract description 50
- 238000007789 sealing Methods 0.000 claims description 15
- 239000002390 adhesive tape Substances 0.000 claims description 12
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 8
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 8
- 241001330002 Bambuseae Species 0.000 claims description 8
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 8
- 239000011425 bamboo Substances 0.000 claims description 8
- 239000000428 dust Substances 0.000 abstract description 17
- 238000001514 detection method Methods 0.000 abstract description 9
- 239000012530 fluid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006806 disease prevention Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy 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
- G01N1/2205—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling with filters
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a micro sampling flow control device, which comprises a sampling cylinder and a vacuum pump, wherein the upper end of the sampling cylinder is open, and the lower end of the sampling cylinder is blocked by a lower end cover; the lower end cover is provided with an evacuation port, the lower end of the lower end cover is provided with a supporting leg, and the evacuation port is connected with a vacuum pump through a pipeline; a flow control mechanism consisting of a pattern plate, a rotary table, blades, an arc-shaped rack and a servo motor is arranged in the sampling cylinder; still be provided with the grid plate that is located the flow control mechanism top in the sampling cylinder, the top of grid plate is provided with the cotton layer of sampling, has the clearance between the cotton layer of sampling and the grid plate, and the edge on the cotton layer of sampling is connected with the inner wall of sampling cylinder is sealed can dismantle. The invention can freely adjust the size of the flow passage, can ensure that dust is uniformly attached to the sampling cotton, reduces the detection difficulty and improves the detection precision.
Description
Technical Field
The invention relates to the technical field of air extraction pumps, in particular to a micro sampling flow control device.
Background
The dust sampler is a portable device for collecting dust samples in dust-containing air, is widely applied to health monitoring and evaluation of departments such as disease prevention, environmental monitoring, labor protection, safety supervision, military affairs, scientific research and teaching, metallurgy, petrochemical industry, railways, building materials and the like, and is specially used for measuring the average concentration of dust in the air in working places of production teams and groups. In the dust sampler, a pre-catcher is a separating device of the dust sampler and is used for collecting dust and analyzing related data through the dust collected on a filter screen inside the pre-catcher. But its air passage's of current air sampling device size is fixed, can not carry out effective control to the flow of sampling gas, and current air sampling device is when using simultaneously, and the dust can not be even attached to on the sampling cotton, and not only the detection degree of difficulty is big, and the testing result is also inaccurate moreover.
Disclosure of Invention
The invention provides a micro sampling flow control device for solving the defects of the prior art, which can adjust the size of a flow channel, ensure that dust is uniformly attached to sampling cotton, reduce the detection difficulty and improve the detection precision.
In order to achieve the purpose, the invention provides the following technical scheme:
the micro sampling flow control device comprises a sampling cylinder and a vacuum pump, wherein the upper end of the sampling cylinder is open, and the lower end of the sampling cylinder is blocked by a lower end cover; the lower end cover is provided with an evacuation port, the lower end of the lower end cover is provided with a supporting leg, and the evacuation port is connected with a vacuum pump through a pipeline; a flow control mechanism consisting of a pattern plate, a rotary table, blades, an arc-shaped rack and a servo motor is arranged in the sampling cylinder; the outer ring and the inner ring are connected through at least five connecting plates, the connecting plates are provided with strip holes, and the outer side of the pattern plate is fixed with the inner wall of the sampling cylinder; the center of the turntable is provided with a through hole, the upper end surface of the turntable is provided with a regular polygonal sliding groove, and the number of the edges of the sliding groove is the same as that of the connecting plates; the turntable is arranged below the inner ring, and the turntable is connected with the outer ring through a bearing; the blade comprises a base part and a triangular part which are integrally formed, a cylindrical sliding rod is fixed on the upper end surface of the base part, and a guide block is arranged on the lower end surface of the base part; the triangular part is an isosceles triangle, the bottom edge of the triangular part is connected with the base part into a whole, and the angle of the vertex angle of the triangular part is equal to the ratio of 360 degrees to the number of the connecting plates; the cylindrical slide bar is positioned on an angular bisector of the vertex angle of the triangular part, and a connecting line between the guide block and the cylindrical slide bar is perpendicular to the angular bisector of the vertex angle of the triangular part; the blades are arranged in a crack between the rotary table and the inner ring, one blade is arranged in each edge of the sliding groove, the guide block at the lower end of each blade is inserted into the sliding groove, the guide block can slide in the sliding groove, the cylindrical sliding rod at the upper end of each blade is inserted into the strip hole, and the cylindrical sliding rod can slide in the strip hole; the arc-shaped rack is fixed with the lower end face of the rotary table, the servo motor is arranged below the pattern plate and fixed with the inner wall of the sampling cylinder, a rotating shaft of the servo motor is provided with a driving gear, and the driving gear is meshed with the arc-shaped rack; still be provided with the grid plate that is located the flow control mechanism top in the sampling cylinder, the top of grid plate is provided with the cotton layer of sampling, has the clearance between cotton layer of sampling and the grid plate, and the edge on the cotton layer of sampling is connected with the inner wall of sampling cylinder is sealed can dismantle.
Furthermore, the number of the connecting plates and the number of the blades are six, the sliding grooves are regular hexagons, and the vertex angles of the triangular parts on the blades are 60 degrees
Further, the arc-shaped rack is fixed with the rotary table through a bolt, and the central angle of the arc-shaped rack is at least 60 degrees.
Furthermore, the extension line of the elongated hole is tangent to the inner ring.
Further, the height of the gap between the bottom surface of the sampling cotton layer and the top surface of the grid plate is not less than 24 mm.
One preferable embodiment for realizing the sealed and detachable connection of the edge of the sampling cotton layer and the inner wall of the sampling cylinder is that a baffle ring is arranged above the grid plate, the edge of the baffle ring is fixed with the inner wall of the sampling cylinder, and a rubber strip is sleeved on the baffle ring; a casing is arranged on the outer side of the sampling cotton layer, the diameter of the casing is the same as the inner diameter of the rubber strip, and an outer folded edge extending outwards is arranged at the upper end of the casing; the jacket is inserted into the adhesive tape, the outer wall of the jacket is in close contact with the adhesive tape, and the lower surface of the outer folded edge is in close contact with the adhesive tape.
Furthermore, at least two hauling ropes are arranged on the upper end face of the outer folding edge.
Another preferable embodiment for realizing the sealed detachable connection of the edge of the sampling cotton layer and the inner wall of the sampling cylinder in the invention is that the sampling cotton layer is in a round cake shape, the outer edge of the sampling cotton layer is provided with a core cylinder, the height of the core cylinder is greater than the thickness of the sampling cotton layer, the core cylinder is placed on the grid plate, and a sealing strip is arranged between the core cylinder and the sampling cylinder.
Further, the sealing strip adopts the rubber material, and the sealing strip is fixed with the inner wall of sampling cylinder, sealing strip and the outer wall in close contact with of core section of thick bamboo.
Compared with the prior art, the invention can freely adjust the size of the flow channel, can also ensure that dust is uniformly attached to the sampling cotton, reduces the detection difficulty and improves the detection precision; in addition, the sampling cotton layer is easy to disassemble and assemble, and has the advantage of convenient use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that 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 according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a first embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at I;
FIG. 3 is a schematic structural view of a second embodiment of the present invention;
FIG. 4 is an enlarged partial view taken at II in FIG. 3;
FIG. 5 is a schematic structural view of the flow control mechanism of FIG. 1 or FIG. 3;
FIG. 6 is a top view of FIG. 5 with the vanes in a fully closed position;
FIG. 7 is also a top view of FIG. 5 with the vanes in an open position;
FIG. 8 is a structural view of a card in the present invention;
FIG. 9 is a structural view of a turntable in the present invention;
FIG. 10 is a block diagram of a blade according to the present invention;
fig. 11 is a left side view of fig. 10.
The reference numerals are explained below:
in the figure: 1. a vacuum pump; 2. a pipeline; 3. supporting legs; 4. a lower end cover; 5. a sampling cartridge; 6. a flow control mechanism; 7. a grid plate; 8. a core barrel; 9. a sealing strip; 10. sampling a cotton layer; 11. a pattern plate; 1101. an outer ring; 1102. a connecting plate; 1103. an inner ring; 1104. a strip hole; 12. a bearing; 13. a turntable; 1301. a chute; 14. a blade; 1401. a base; 1402. a triangular portion; 1403. a cylindrical slide bar; 1404. a guide block; 15. an arc-shaped rack; 16. a driving gear; 17. a servo motor; 18. emptying the air; 19. a housing; 1901. folding the edges outwards; 20. a baffle ring; 21. an adhesive tape; 22. and (6) pulling the rope.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1-11, the invention provides a micro sampling flow control device, which comprises a sampling cylinder 5 and a vacuum pump 1, wherein the upper end of the sampling cylinder 5 is open, the lower end of the sampling cylinder 5 is blocked by a lower end cover 4, and the sampling cylinder 5 and the lower end cover 4 can be fixedly connected in a flange manner; the lower end cover 4 is provided with an evacuation port 18, the lower end of the lower end cover 4 is provided with a supporting leg 3, the evacuation port 18 is connected with a vacuum pump 1 through a pipeline 2, and negative pressure is formed in the sampling cylinder 5 through the vacuum pump 1; a flow control mechanism 6 consisting of a pattern plate 11, a rotary table 13, blades 14, an arc-shaped rack 15 and a servo motor 17 is arranged in the sampling cylinder 5; the pattern plate 11 comprises an outer ring 1101, an inner ring 1103 and connecting plates 1102 which are integrally formed, the outer ring 1101 and the inner ring 1103 are connected through five, six or more connecting plates 1102, the connecting plates 1102 are provided with strip holes 1104, and the outer side of the pattern plate 11 is fixed with the inner wall of the sampling cylinder 5; a through hole for air flow to pass through is formed in the center of the rotary disc 13, the diameter of the through hole is matched with the inner diameter of the inner ring 1103, sliding grooves 1301 in a regular polygon shape are formed in the upper end face of the rotary disc 13, the number of the sides of the sliding grooves 1301 is the same as that of the connecting plates 1102, namely, when the number of the connecting plates 1102 is five, the sliding grooves 1301 are in a regular pentagon shape, when the number of the connecting plates 1102 is six, the sliding grooves 1301 are in a regular hexagon shape, and so on; the rotary table 13 is arranged below the inner ring 1103, and the rotary table 13 is connected with the outer ring 1101 through a bearing 12; the blade 14 comprises a base 1401 and a triangular part 1402 which are integrally formed, wherein a cylindrical sliding rod 1403 is fixed on the upper end surface of the base 1401, and a guide block 1404 is arranged on the lower end surface of the base 1401; the triangular part 1402 is an isosceles triangle, the bottom side of the triangular part 1402 is connected with the base 1401 into a whole, and the angle of the vertex angle of the triangular part 1402 is equal to the ratio of 360 degrees to the number of the connecting plates 1102; the cylindrical slide bar 1403 is positioned on an angular bisector of a vertex angle of the triangular part 1402, and a connecting line between the guide block 1404 and the cylindrical slide bar 1403 is perpendicular to the angular bisector of the vertex angle of the triangular part 1402; the blades 14 are arranged in a gap between the rotary disc 13 and the inner ring 1103, one blade 14 is arranged in each edge of the sliding groove 1301, a guide block 1404 at the lower end of each blade 14 is inserted into the sliding groove 1301, the guide block 1404 can slide in the sliding groove 1301, a cylindrical sliding rod 1403 at the upper end of each blade 14 is inserted into the long hole 1104, and the cylindrical sliding rod 1403 can slide in the long hole 1104; the arc-shaped rack 15 is fixed with the lower end face of the rotary table 13, the servo motor 17 is arranged below the pattern plate 11 and fixed with the inner wall of the sampling cylinder 5, a rotating shaft of the servo motor 17 is provided with a driving gear 16, and the driving gear 16 is meshed with the arc-shaped rack 15; referring to fig. 6, when the blades 14 are at this position, all the blades 14 can be spliced together to form a complete circle, the servo motor 17 can drive the rotary disc 13 to rotate clockwise by a certain angle, so that the guide block 1404 and the cylindrical sliding bar 1403 slide in the sliding slot 1301 and the strip-shaped hole respectively, after the rotary disc 13 rotates by a certain angle, the state of the blades 14 can be referred to fig. 7, the blades 14 form a regular polygonal hole in the center of the inner ring 1103, and the size of the regular polygonal hole can be controlled by controlling the rotation angle of the rotary disc 13; a grid plate 7 positioned above the flow control mechanism 6 is further arranged in the sampling cylinder 5, a plurality of air holes for air circulation are uniformly distributed on the grid plate 7, a sampling cotton layer 10 is arranged above the grid plate 7, a gap exists between the sampling cotton layer 10 and the grid plate 7, and the edge of the sampling cotton layer 10 is hermetically and detachably connected with the inner wall of the sampling cylinder 5; when the sampling cotton layer 10 is removed, the grid plate 7 can prevent impurities from entering the sampling cylinder 5, so that the vacuum pump 1 is protected.
In specific implementation, the number of the connecting plate 1102 and the number of the blades 14 may be six, in which case the sliding groove 1301 is a regular hexagon, and the vertex angle of the triangular portion 1402 on the blade 14 is 60 °. The arc-shaped rack 15 is fixed with the rotary disc 13 through a bolt, when the connecting plate 1102 and the blades 14 are six in number, the central angle of the arc-shaped rack 15 is at least 60 degrees, the rotary disc 13 can rotate 60 degrees, and therefore the regular polygon hole can be adjusted from the minimum state to the maximum state. The extension line of the elongated hole 1104 is tangent to the inner ring 1103, and the width of the elongated hole 1104 may be slightly larger than the diameter of the cylindrical slide bar 1403, so as to ensure that the cylindrical slide bar 1403 can slide smoothly in the elongated hole 1104. The clearance between the bottom surface of the cotton layer 10 of sampling and the top surface of grid plate 7 can reduce the influence that grid plate 7 caused to the air current, makes gaseous even cotton layer 10 of sampling that passes through, and then guarantees to collect the dust evenly distributed on the cotton layer 10 of sampling, improves the measuring degree of accuracy. In order to further ensure that the dust can be uniformly distributed on the sampling cotton layer 10, the height of the gap between the bottom surface of the sampling cotton layer 10 and the top surface of the grid plate 7 is not less than 24mm, so that a cavity with the height not less than 24mm is formed between the sampling cotton layer 10 and the grid plate 7.
In order to realize the sealed detachable connection of the edge of the sampling cotton layer 10 and the inner wall of the sampling cylinder 5, a baffle ring 20 is arranged above the grid plate 7, the edge of the baffle ring 20 is fixed with the inner wall of the sampling cylinder 5, and a rubber strip 21 with a U-shaped section is sleeved on the baffle ring 20; a sleeve 19 is arranged on the outer side of the sampling cotton layer 10, the diameter of the sleeve 19 is the same as the inner diameter of the adhesive tape 21, and an outer folded edge 1901 extending outwards is arranged at the upper end of the sleeve 19; in cover case 19 insert adhesive tape 21, the outer wall of cover case 19 and adhesive tape 21 in close contact with, the lower surface of outer hem 1901 and adhesive tape 21 in close contact with guarantee through adhesive tape 21 that cover case 19 and fender ring 20 are well sealed. Set up two haulage ropes 22 on the up end of outer hem 1901 at least, after the sampling is accomplished, portable haulage rope 22 can take out cover 19 and sampling cotton layer 10 together, reduces cover 19's the degree of difficulty of taking out.
In order to realize the sealing and detachable connection of the edge of the sampling cotton layer 10 and the inner wall of the sampling cylinder 5, another preferred embodiment of the present invention is that the sampling cotton layer 10 is in a round cake shape, a core cylinder 8 is arranged on the outer edge of the sampling cotton layer 10, the height of the core cylinder 8 is greater than the thickness of the sampling cotton layer 10, the core cylinder 8 is placed on the grid plate 7, and a sealing strip 9 is arranged between the core cylinder 8 and the sampling cylinder 5. Wherein, the sealing strip 9 preferentially adopts the rubber material, and sealing strip 9 is fixed with the inner wall of cartridge 5, and sealing strip 9 and the outer wall in close contact with of core section of thick bamboo 8 realize through sealing strip 9 that the air current can only pass through sampling cotton layer 10 between 8 and the cartridge 5 to be favorable to improving the accuracy that detects, this kind of mounting means of core section of thick bamboo 8 dismouting very easily also in addition has improved the use convenience of device.
From the knowledge of fluid mechanics, we know that the flow Q ═ kA (Δ P/ρ)1/2 through a section is: k is a resistance coefficient or a flow coefficient, which is related to the geometric shape of the flow channel; Δ P: differential pressure before and after the flow channel; ρ: the density of the fluid; a is the cross section of the flow channel. Therefore, the density of the fluid is constant after the fluid and the pressure difference between the front and the back of the flow channel are determined, the resistance coefficient k is basically kept unchanged, and the flow rate is only related to the cross-sectional area and the geometric shape of the flow channel.
When the sampling device is used, negative pressure is formed in the sampling cylinder 5 through the vacuum pump 1, the pressure is kept constant, air enters the sampling cylinder 5 through the sampling cotton layer 10, and when the air passes through the sampling cotton layer 10, dust in the air is uniformly attached to the sampling cotton layer 10, so that the dust is collected; meanwhile, the servo motor 17 can be used to adjust the size of the regular polygonal hole (i.e. the cross-sectional area of the air flow passage) formed by the vane 14, thereby controlling the air flow. The invention can freely adjust the size of the flow passage, can ensure that dust is uniformly attached to the sampling cotton, reduces the detection difficulty and improves the detection precision, and in addition, the sampling cotton layer 10 is easy to disassemble and assemble, thereby having the advantage of convenient use.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. A micro sampling flow control device comprises a sampling cylinder and a vacuum pump, and is characterized in that the upper end of the sampling cylinder is opened, and the lower end of the sampling cylinder is blocked by a lower end cover; the lower end cover is provided with an evacuation port, the lower end of the lower end cover is provided with a supporting leg, and the evacuation port is connected with a vacuum pump through a pipeline; a flow control mechanism consisting of a pattern plate, a rotary table, blades, an arc-shaped rack and a servo motor is arranged in the sampling cylinder; the outer ring and the inner ring are connected through at least five connecting plates, the connecting plates are provided with strip holes, and the outer side of the pattern plate is fixed with the inner wall of the sampling cylinder; the center of the turntable is provided with a through hole, the upper end surface of the turntable is provided with a regular polygonal sliding groove, and the number of the edges of the sliding groove is the same as that of the connecting plates; the turntable is arranged below the inner ring, and the turntable is connected with the outer ring through a bearing; the blade comprises a base part and a triangular part which are integrally formed, a cylindrical sliding rod is fixed on the upper end surface of the base part, and a guide block is arranged on the lower end surface of the base part; the triangular part is an isosceles triangle, the bottom edge of the triangular part is connected with the base part into a whole, and the angle of the vertex angle of the triangular part is equal to the ratio of 360 degrees to the number of the connecting plates; the cylindrical slide bar is positioned on an angular bisector of the vertex angle of the triangular part, and a connecting line between the guide block and the cylindrical slide bar is perpendicular to the angular bisector of the vertex angle of the triangular part; the blades are arranged in a crack between the rotary table and the inner ring, one blade is arranged in each edge of the sliding groove, the guide block at the lower end of each blade is inserted into the sliding groove, the guide block can slide in the sliding groove, the cylindrical sliding rod at the upper end of each blade is inserted into the strip hole, and the cylindrical sliding rod can slide in the strip hole; the arc-shaped rack is fixed with the lower end face of the rotary table, the servo motor is arranged below the pattern plate and fixed with the inner wall of the sampling cylinder, a rotating shaft of the servo motor is provided with a driving gear, and the driving gear is meshed with the arc-shaped rack; still be provided with the grid plate that is located the flow control mechanism top in the sampling cylinder, the top of grid plate is provided with the cotton layer of sampling, has the clearance between cotton layer of sampling and the grid plate, and the edge on the cotton layer of sampling is connected with the inner wall of sampling cylinder is sealed can dismantle.
2. The micro sample flow control device of claim 1, wherein: the quantity of connecting plate and blade be six, the spout is regular hexagon, the apex angle of the triangle-shaped portion on the blade is 60.
3. The micro sample flow control device of claim 2, wherein: the arc-shaped rack is fixed with the turntable through a bolt, and the central angle of the arc-shaped rack is at least 60 degrees.
4. The micro sample flow control device of claim 1, wherein: the extension line of the strip hole is tangent to the inner ring.
5. The micro sample flow control device of claim 1, wherein: the height of the gap between the bottom surface of the sampling cotton layer and the top surface of the grid plate is not less than 24 mm.
6. The micro sample flow control device according to any of claims 1 to 5, wherein: a baffle ring is arranged above the grid plate, the edge of the baffle ring is fixed with the inner wall of the sampling cylinder, and a rubber strip is sleeved on the baffle ring; a casing is arranged on the outer side of the sampling cotton layer, the diameter of the casing is the same as the inner diameter of the rubber strip, and an outer folded edge extending outwards is arranged at the upper end of the casing; the jacket is inserted into the adhesive tape, the outer wall of the jacket is in close contact with the adhesive tape, and the lower surface of the outer folded edge is in close contact with the adhesive tape.
7. The micro sample flow control device of claim 6, wherein: at least two hauling ropes are arranged on the upper end surface of the outer folded edge.
8. The micro sample flow control device according to any of claims 1 to 5, wherein: the sampling cotton layer is cake-shaped, and the outer fringe on sampling cotton layer is provided with a core section of thick bamboo, the thickness on sampling cotton layer is highly greater than to a core section of thick bamboo, a core section of thick bamboo is placed on the net board, is provided with the sealing strip between a core section of thick bamboo and the sampling section of thick bamboo.
9. The micro sample flow control device of claim 8, wherein: the sealing strip is made of rubber, the sealing strip is fixed to the inner wall of the sampling cylinder, and the sealing strip is in close contact with the outer wall of the core cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110050490.6A CN112881103A (en) | 2021-01-14 | 2021-01-14 | Micro sampling flow control device |
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|---|---|---|---|
| CN202110050490.6A CN112881103A (en) | 2021-01-14 | 2021-01-14 | Micro sampling flow control device |
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| CN112881103A true CN112881103A (en) | 2021-06-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114887786A (en) * | 2022-05-11 | 2022-08-12 | 煤科院节能技术有限公司 | Nozzle capable of adjusting fluid flow velocity |
| CN116718442A (en) * | 2023-08-07 | 2023-09-08 | 张家港谱析传感科技有限公司 | Measuring range and flow regulating method of individual sampler |
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