CN110514484B - Air sampling clamp applied to uncertainty evaluation - Google Patents
Air sampling clamp applied to uncertainty evaluation Download PDFInfo
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- CN110514484B CN110514484B CN201910781127.4A CN201910781127A CN110514484B CN 110514484 B CN110514484 B CN 110514484B CN 201910781127 A CN201910781127 A CN 201910781127A CN 110514484 B CN110514484 B CN 110514484B
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- fixedly connected
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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
Abstract
The invention discloses an air sampling clamp applied to uncertainty evaluation, which relates to the technical field of uncertainty evaluation and solves the problem of low air collection efficiency caused by time-consuming replacement of the existing microporous filter membrane, and the technical scheme is characterized by comprising a fixed seat, a fixed pipe fixedly connected to the fixed seat, a rotating rod arranged on the top surface of the fixed seat, a supporting plate fixedly connected to one end of the top of the rotating rod, two connecting pipes arranged at two ends of the supporting plate, a clamping pipe fixedly connected to one end of the top of the connecting pipe and used for fixing the microporous filter membrane, and a rotary cylinder arranged in the fixed seat and used for driving the rotating rod to move, wherein when one microporous filter membrane is collected, the rotary cylinder firstly jacks up and rotates the rotating rod to collect air of a new microporous filter membrane, and a worker takes down the collected microporous filter membrane, so that the air collection can still be carried out when the microporous filter membrane is taken down, the efficiency of air collection is improved.
Description
Technical Field
The invention relates to the technical field of uncertainty assessment, in particular to an air sampling clamp applied to uncertainty assessment.
Background
Lead is a toxic metal which is clearly required to be strictly controlled by the world health organization, has biological accumulation, durability and irreversibility, can cause certain harm to the liver and kidney functions of a human body, and an atomic absorption spectrophotometry is a measuring method for the content of lead and compounds thereof in the air of a workplace; the uncertainty of measurement is a quantitative characterization of the quality of a measurement result, a certain uncertainty is inevitably introduced into any measurement, the uncertainty of the detection method characterizes the measurement level of a laboratory, and the uncertainty evaluation of the detection method is not only a regulation in the national measurement technical specification, but also a guarantee for determining the science and effectiveness of the measurement structure.
When the uncertainty evaluation of atomic absorption spectrophotometry of lead and lead compounds in air of a workplace is carried out, firstly, air samples are collected through a microporous filter membrane, then, relevant experimental reagents are added to prepare a plurality of sample solutions, and then, the uncertainty evaluation is carried out through the public indication of copper drum measurement and uncertainty calculation; in the uncertainty evaluation of lead and its compound atomic absorption spectrophotometry in carrying out the workplace air, need use the air sampler to carry out air sampling, need press from both sides the centre gripping microfiltration membrane with the sampling when sampling, then utilize microfiltration membrane to carry out the sampling of air, need carry out a lot of collection in the middle of the process of going on determining, but the installation of the microfiltration membrane that the sampling pressed from both sides is all loaded down with trivial details inconvenient with the dismantlement, make microfiltration membrane's change operation can waste more time, the collection of air can't be carried out in this period, thereby the efficiency of air collection has been reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an air sampling clamp applied to uncertainty evaluation, when one microporous filter membrane is collected, a rotating cylinder jacks up a rotating rod firstly to enable a connecting pipe and a fixed pipe to be separated from each other, then the rotating rod is rotated by 180 degrees to enable the connecting pipe at the other end of a supporting plate to be aligned with the fixed pipe, then the rotating cylinder drives the rotating rod to move downwards to enable the connecting pipe to be inserted into the fixed pipe, a new microporous filter membrane is used for collecting air, and a worker takes down the collected microporous filter membrane, so that the air collection can still be carried out when the microporous filter membrane is taken down, and the air collection efficiency is improved.
In order to achieve the purpose, the invention provides the following technical scheme: an air sampling clamp applied to uncertainty evaluation comprises a fixed seat, a fixed pipe which is fixedly connected to the fixed seat and penetrates through the fixed seat along the vertical direction, a rotating rod which is arranged on the top surface of the fixed seat and is parallel to the axial direction of the fixed pipe, a supporting plate which is fixedly connected to one end of the top of the rotating rod and is horizontally arranged, connecting pipes which are arranged at two ends of the supporting plate and are parallel to the axial direction of the rotating rod, a clamping pipe which is fixedly connected to one end of the top of the connecting pipe and is used for fixing a microporous filter membrane, and a rotary air cylinder which is arranged in the fixed seat and is used for driving the rotating rod to move;
the top of the fixed seat is provided with a matching groove along the vertical direction, the bottom of the matching groove is provided with an accommodating groove which is arranged on the fixed seat along the vertical direction, the diameter of the matching groove is equal to that of the rotating rod, the rotating rod can rotate in the matching groove and can slide in the matching groove along the vertical direction, the rotating cylinder is positioned in the accommodating groove, and a piston rod of the rotating cylinder is fixedly connected with the bottom of the rotating rod;
the external diameter of connecting pipe equals the internal diameter of fixed pipe, and the distance of the axis of connecting pipe to dwang axis equals the distance of fixed pipe axis to dwang axis.
By adopting the technical scheme, one connecting pipe is inserted into the fixed pipe, one end of the fixed pipe, which is far away from the connecting pipe, is connected with the air sampler for sampling air, a new microporous filter membrane is arranged on the clamping tube of the other connecting tube, after the microporous filter membrane for collecting air is completely collected, the rotating cylinder jacks up the rotating rod to separate the connecting tube from the fixed tube, then the rotary cylinder drives the supporting plate to rotate, aligns the other connecting pipe with the fixed pipe, then drives the rotating rod to move downwards, so that the connecting pipe is inserted into the fixed pipe to continue air collection, and in the collection process, the staff takes down the microporous filter membrane on the collected clamping pipe and clamps a new microporous filter membrane, the collection of air is carried out when the millipore filtration membrane is changed, and the efficiency of air collection is greatly improved.
The invention is further configured to: the periphery of one end, close to the fixed pipe, of the connecting pipe is provided with an inclined surface, and one side of the bottom of the inclined surface is obliquely arranged towards the direction close to the axis of the connecting pipe;
the fixed tube inner wall is close to the position fixedly connected with sealing ring at top, and the inboard slope of sealing ring sets up, and the inboard top orientation of sealing ring deviates from the direction slope setting of sealing ring axis, and the inboard inclination of sealing ring is the same with the inclination on the inclined plane of fixed tub of bottom.
Through adopting above-mentioned technical scheme, when the connecting pipe inserted fixed pipe, the inclined plane on the connecting pipe was laminated each other with the inboard of sealing ring, made the junction of connecting pipe and fixed pipe can be good sealed through the sealing ring.
The invention is further configured to: a ring-shaped retaining ring is fixedly connected to the position, close to the bottom, of the inner wall of the connecting pipe, a sealing plate is arranged at the top of the retaining ring, a fixed block fixedly connected to the inner wall of the connecting pipe is arranged at the top of the sealing plate, a spring is arranged between the fixed block and the sealing plate, two ends of the spring are respectively and fixedly connected to the sealing plate and the fixed block, the spring is in a compressed state, and the diameter of the sealing plate is smaller than the inner diameter of the connecting pipe and larger than the inner diameter of the retaining ring;
one end fixedly connected with bracing piece that is close to the connecting pipe on the fixed intraductal wall, one side fixedly connected with that the bracing piece is close to the connecting pipe and the coaxial ejector pin of fixed pipe, when the connecting pipe inserted fixed pipe, the ejector pin top was on the closing plate for the closing plate is located and keeps off between ring and the fixed block.
By adopting the technical scheme, the sealing plate is tightly abutted against the retaining ring under the action of the spring, and the connecting pipe is sealed by the sealing plate and the baffle plate, so that air cannot penetrate through the connecting pipe, and therefore, the air cannot penetrate through the connecting pipe when air collection is not carried out, and cannot penetrate through the microporous filter membrane;
when needing to carry out air collection, under the effect of ejector pin for the closing plate breaks away from each other with keeping off the ring, thereby makes the air can pass the connecting pipe, thereby makes the air can pass millipore filtration, thereby carries out the collection of air through millipore filtration.
The invention is further configured to: one side of the top of the baffle ring is fixedly connected with an elastic annular plate which is arranged annularly.
Through adopting above-mentioned technical scheme, have elastic annular plate through the setting for the closing plate directly contacts with the annular plate, thereby makes that sealing ring and baffle can be better seal the connecting pipe.
The invention is further configured to: the one end threaded connection that the centre gripping pipe deviates from the connecting pipe has the pipe of supporting tightly, and the centre gripping pipe deviates from connecting pipe one end fixedly connected with supporting network, supports tightly on the pipe inner wall of keeping away from connecting pipe one end fixedly connected with be used for compressing tightly the ring of supporting on the supporting network with microporous filter membrane.
Through adopting above-mentioned technical scheme, will support the pipe and screw up on the centre gripping pipe, compress tightly the microfiltration membrane on the supporting network through supporting the ring.
The invention is further configured to: the outside of the abutting pipe is connected with a sealing pipe in a threaded manner, and one end of the sealing pipe, which deviates from the connecting pipe, is fixedly connected with a flat plate which seals one end of the sealing pipe, which deviates from the connecting pipe.
Through adopting above-mentioned technical scheme, through setting up sealed tube and flat board, can seal the one end that the centre gripping pipe kept away from the connecting pipe to make microporous membrane can not passed by the air before sampling, after the sampling is ended, seal connecting pipe and centre gripping pipe, make the gas of gathering in the middle of the microporous membrane can not be replaced by other gas, thereby be convenient for take back to and detect in the laboratory, and improved the precision when detecting.
The invention is further configured to: the connecting pipe penetrates through the support plate along the axial direction of the connecting pipe and is in threaded connection with the support plate.
By adopting the technical scheme, the connecting pipe and the clamping pipe which are provided with the microporous filter membrane which collects the gas can be directly detached from the transverse plate, so that the microporous filter membrane which collects the gas can be conveniently brought back to a laboratory; and can install the millipore filtration membrane on the centre gripping pipe in advance before gathering, only need in the in-process of gathering to change centre gripping pipe and connecting pipe together can for the operation is more swift, has further improved the efficiency of gathering.
The invention is further configured to: and the position on the periphery of the connecting pipe, which is close to the clamping pipe, is fixedly connected with a baffle which is vertical to the axial direction of the connecting pipe.
Through adopting above-mentioned technical scheme, can carry on spacingly to the connecting pipe through setting up the baffle, when baffle and backup pad contacted each other, the connecting pipe just can insert in the middle of the fixed pipe.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. the invention inserts one of the connecting pipes into the fixed pipe by arranging the rotary cylinder, the rotary rod, the supporting plate, the connecting pipe, the fixed pipe and the clamping pipe, one end of the fixed pipe, which is far away from the connecting pipe, is connected with the air sampler for sampling air, a new microporous filter membrane is arranged on the clamping pipe of the other connecting pipe, after the microporous filter membrane for collecting air is completely collected, the rotary cylinder jacks up the rotary rod firstly to separate the connecting pipe from the fixed pipe, then the rotary cylinder drives the supporting plate to rotate to align the other connecting pipe with the fixed pipe, then the rotary cylinder drives the rotary rod to move downwards to ensure that the connecting pipe is inserted into the fixed pipe to continue air collection, a worker takes off the microporous filter membrane on the clamping pipe after collection in the collection process, clamps the new microporous filter membrane, and collects air while replacing the microporous filter membrane, the efficiency of air collection is greatly improved;
2. according to the invention, by arranging the sealing plate, the baffle ring, the sealing pipe and the flat plate, after the gas is collected, the connecting pipe and the clamping pipe can be sealed at the same time, so that the gas collected in the microporous filter membrane after the gas is collected is not easily influenced by other air, and the testing precision is improved.
Drawings
FIG. 1 is an isometric view of the complete structure of the embodiment;
FIG. 2 is a sectional view of the entire structure of the embodiment;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is an enlarged view of the portion B of FIG. 2;
fig. 5 is an enlarged schematic view of the portion C of fig. 4.
In the figure: 1. a fixed seat; 11. a mating groove; 12. accommodating grooves; 2. rotating the rod; 21. a rotary cylinder; 3. a support plate; 4. a fixed tube; 41. a seal ring; 42. a support bar; 43. a top rod; 5. a connecting pipe; 51. a baffle plate; 6. clamping the tube; 61. abutting the pipe; 62. a tightening ring; 63. a sealing tube; 64. a flat plate; 65. a support net; 7. a microporous filtration membrane; 8. a sealing plate; 81. a baffle ring; 811. an annular plate; 82. a fixed block; 83. a spring.
Detailed Description
Example (b): an air sampling clip for use in uncertainty assessment, see figures 1 and 2, the microporous membrane filter comprises a fixed seat 1, a fixed tube 4 fixedly connected to the fixed seat 1 and penetrating through the fixed seat 1 along the vertical direction, a rotating rod 2 arranged on the top surface of the fixed seat 1 and parallel to the axial direction of the fixed tube 4, a supporting plate 3 fixedly connected to one end of the top of the rotating rod 2 and horizontally arranged, two axial directions arranged at two ends of the supporting plate 3 and parallel to the axial direction of the rotating rod 2, a clamping tube 6 fixedly connected to one end of the top of the connecting tube 5 and used for fixing the microporous membrane; the top of the fixed seat 1 is provided with a matching groove 11 along the vertical direction, the bottom of the matching groove 11 is provided with an accommodating groove 12 which is arranged on the fixed seat 1 along the vertical direction, the diameter of the matching groove 11 is equal to that of the rotating rod 2, the rotating rod 2 can rotate in the matching groove 11 and can slide in the matching groove 11 along the vertical direction, the rotating cylinder 21 is positioned in the accommodating groove 12, and a piston rod of the rotating cylinder 21 is fixedly connected with the bottom of the rotating rod 2; the outer diameter of the connecting pipe 5 is equal to the inner diameter of the fixed pipe 4, and the distance from the axis of the connecting pipe 5 to the axis of the rotating rod 2 is equal to the distance from the axis of the fixed pipe 4 to the axis of the rotating rod 2; the end of the fixed pipe 4 departing from the connecting pipe 5 is connected with the air sampler.
Fix two microfiltration membrane 7 on centre gripping pipe 6 through two support tight tube 61 earlier, then insert one of them connecting pipe 5 and sample in the middle of fixed pipe 4, after 7 sampling of one of them microfiltration membrane finishes, gyration cylinder 21 is earlier with dwang 2 jack-up, make connecting pipe 5 break away from with fixed pipe 4, then drive backup pad 3 through gyration cylinder 21 and rotate, align another connecting pipe 5 and fixed pipe 4, then gyration cylinder 21 drives dwang 2 downstream, make this connecting pipe 5 insert and continue to carry out air acquisition in the middle of fixed pipe 4, the during-process staff who gathers takes off the microfiltration membrane 7 on the centre gripping pipe 6 that finishes, new microfiltration membrane 7 in the centre gripping.
Referring to fig. 2 and 3, the holding tube 6 is fixedly connected with a supporting net 65 away from one end of the connecting tube 5, the tightening tube 61 is fixedly connected with a tightening ring 62 for pressing the microporous filter membrane 7 on the supporting net 65 away from the inner wall of one end of the connecting tube 5, and after the tightening tube 61 is tightened, the tightening ring 62 presses the microporous filter membrane 7 on the supporting net 65. Support pipe 61 outside threaded connection and have a sealed tube 63, the one end fixedly connected with that sealed tube 63 deviates from connecting pipe 5 and deviates from the sealed flat board 64 of connecting pipe 5 one end with sealed tube 63, screw up sealed tube 63 after supporting on tight pipe 61, can seal the one end of centre gripping pipe 6 to make external air be difficult to pass microfiltration membrane 7 when carrying out air collection.
Referring to fig. 4, the connection pipe 5 is screwed to the support plate 3, a baffle 51 is fixedly connected to the outer circumference of the connection pipe 5, and the connection pipe 5 can be inserted into the fixing pipe 4 when the baffle 51 and the support plate 3 contact each other. An inclined surface is arranged on the periphery of one end, close to the fixed pipe 4, of the connecting pipe 5, and one side of the bottom of the inclined surface is inclined towards the direction close to the axis of the connecting pipe 5; the position, close to the top, of the inner wall of the fixed pipe 4 is fixedly connected with a sealing ring 41, the inner side of the sealing ring 41 is obliquely arranged, the top of the inner side of the sealing ring 41 is obliquely arranged in the direction departing from the axis of the sealing ring 41, and the oblique angle of the inner side of the sealing ring 41 is the same as that of the oblique plane at the bottom of the fixed pipe 4; when the connection pipe 5 is inserted into the fixed pipe 4, the inclined surface of the connection pipe 5 and the inner side of the sealing ring 41 contact each other, thereby achieving sealing of the connection between the connection pipe 5 and the fixed pipe 4.
Referring to fig. 4 and 5, a ring-shaped baffle ring 81 is fixedly connected to a position, close to the bottom, of the inner wall of the connecting pipe 5, a sealing plate 8 is arranged at the top of the baffle ring 81, a fixing block 82 fixedly connected to the inner wall of the connecting pipe 5 is arranged at the top of the sealing plate 8, a spring 83 is arranged between the fixing block 82 and the sealing plate 8, two ends of the spring 83 are respectively and fixedly connected to the sealing plate 8 and the fixing block 82, the spring 83 is in a compressed state, and the diameter of the sealing plate 8 is smaller than the inner diameter of the connecting pipe 5 and larger than the inner diameter of the baffle ring 81; one end fixedly connected with bracing piece 42 that is close to connecting pipe 5 on the fixed pipe 4 inner wall, one side fixedly connected with that bracing piece 42 is close to connecting pipe 5 and the coaxial ejector pin 43 of fixed pipe 4, and when connecting pipe 5 inserted fixed pipe 4, ejector pin 43 pushed up on closing plate 8 for closing plate 8 is located and keeps off between ring 81 and the fixed block 82. The top of the baffle ring 81 is fixedly connected with a ring-shaped plate 811 which is arranged in a ring shape, and the ring-shaped plate 811 has elasticity.
The working principle of the air sampling clamp applied to uncertainty evaluation during use is as follows: when air collection is not performed, the sealing tube 63 seals one end of the clamping tube 6 away from the connecting tube 5, the sealing plate 8 and the baffle ring 81 seal the connecting tube 5 under the action of the spring 83, so that air cannot penetrate through the microporous filter membrane 7, and the two connecting tubes 5 are connected to the supporting plate 3; when gas collection is carried out, one connecting pipe 5 is inserted into the fixed pipe 4, the sealing pipe 63 is unscrewed, the sealing plate 8 is separated from the baffle ring 81 under the action of the ejector rod 43, and the sealing ring 41 is positioned between the baffle ring 81 and the fixed block 82, so that air can smoothly pass through the microporous filter membrane 7; after the air collection is finished, the rotary cylinder 21 jacks up the support plate 3, the ejector rod 43 is separated from the sealing plate 8, the sealing plate 8 is continuously abutted against the baffle ring 81, then the rotary cylinder 21 drives the support plate 3 to rotate 180 degrees, another connecting pipe 5 is inserted into the fixed pipe 4 for air collection, the sealing pipe 63 is screwed on the clamping pipe 6 provided with the microporous filter membrane 7 for collecting air, the clamping pipe 6 is sealed, then the connecting pipe 5 is screwed off from the fixed plate, and the connecting pipe 5 provided with the microporous filter membrane 7 for collecting air and the clamping pipe 6 are replaced; the screwed-down connecting pipe 5 and the screwed-down clamping pipe 6 are stored, and the connecting pipe 5 and the sealing pipe 63 are sealed, so that the microporous filter membrane 7 which collects air therein is not polluted by the rest of air, and the detection result is more accurate.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (7)
1. An air sampling clip applied to uncertainty assessment is characterized in that: the device comprises a fixed seat (1), a fixed pipe (4) which is fixedly connected on the fixed seat (1) and penetrates through the fixed seat (1) along the vertical direction, a rotating rod (2) which is arranged on the top surface of the fixed seat (1) and is parallel to the axial direction of the fixed pipe (4), a supporting plate (3) which is fixedly connected at one end of the top of the rotating rod (2) and is horizontally arranged, connecting pipes (5) which are arranged at two ends of the supporting plate (3) and are parallel to the axial direction of the rotating rod (2), a clamping pipe (6) which is fixedly connected at one end of the top of the connecting pipe (5) and is used for fixing a microfiltration membrane (7), and a rotary cylinder (21) which is arranged in the fixed seat (1) and is used for driving the rotating rod (2) to move;
the top of the fixing seat (1) is provided with a matching groove (11) along the vertical direction, the bottom of the matching groove (11) is provided with an accommodating groove (12) which is arranged on the fixing seat (1) along the vertical direction, the diameter of the matching groove (11) is equal to that of the rotating rod (2), the rotating rod (2) can rotate in the matching groove (11) and can slide in the matching groove (11) along the vertical direction, the rotary cylinder (21) is positioned in the accommodating groove (12) and a piston rod of the rotary cylinder (21) is fixedly connected with the bottom of the rotating rod (2);
the outer diameter of the connecting pipe (5) is equal to the inner diameter of the fixed pipe (4), and the distance from the axis of the connecting pipe (5) to the axis of the rotating rod (2) is equal to the distance from the axis of the fixed pipe (4) to the axis of the rotating rod (2);
a ring-shaped baffle ring (81) is fixedly connected to a position, close to the bottom, of the inner wall of the connecting pipe (5), a sealing plate (8) is arranged at the top of the baffle ring (81), a fixing block (82) fixedly connected to the inner wall of the connecting pipe (5) is arranged at the top of the sealing plate (8), a spring (83) is arranged between the fixing block (82) and the sealing plate (8), two ends of the spring (83) are respectively and fixedly connected to the sealing plate (8) and the fixing block (82), the spring (83) is in a compression state, and the diameter of the sealing plate (8) is smaller than the inner diameter of the connecting pipe (5) and larger than the inner diameter of the baffle ring (81);
one end fixedly connected with bracing piece (42) that is close to connecting pipe (5) on fixed pipe (4) inner wall, one side fixedly connected with that bracing piece (42) are close to connecting pipe (5) and fixed pipe (4) coaxial ejector pin (43), when connecting pipe (5) inserted fixed pipe (4), ejector pin (43) top was on closing plate (8) for closing plate (8) are located and keep off between ring (81) and fixed block (82).
2. An air sampling clip to be used in uncertainty assessment according to claim 1, characterized in that: an inclined plane is arranged on the periphery of one end, close to the fixed pipe (4), of the connecting pipe (5), and one side of the bottom of the inclined plane is inclined towards the direction close to the axis of the connecting pipe (5);
the position fixedly connected with sealing ring (41) that fixed pipe (4) inner wall is close to the top, the inboard slope setting of sealing ring (41), the inboard top orientation of sealing ring (41) deviates from the direction slope setting of sealing ring (41) axis, the inboard inclination of sealing ring (41) is the same with the inclination on the inclined plane of fixed pipe (4) bottom.
3. An air sampling clip to be used in uncertainty assessment according to claim 1, characterized in that: one side of the top of the baffle ring (81) is fixedly connected with an elastic annular plate (811) which is arranged annularly.
4. An air sampling clip to be used in uncertainty assessment according to claim 1, characterized in that: one end threaded connection that centre gripping pipe (6) deviates from connecting pipe (5) has to support tight pipe (61), and centre gripping pipe (6) deviates from connecting pipe (5) one end fixedly connected with supporting network (65), supports on tight pipe (61) deviates from the inner wall of connecting pipe (5) one end fixedly connected with be used for compressing tightly supporting ring (62) on supporting network (65) with microfiltration membrane (7).
5. An air sampling clip to be used in uncertainty assessment according to claim 4, characterized in that: support pipe (61) outside threaded connection and have sealed tube (63), sealed tube (63) deviate from one end fixedly connected with that connecting pipe (5) deviate from sealed dull and stereotyped (64) of connecting pipe (5) one end with sealed tube (63).
6. An air sampling clip to be used in uncertainty assessment according to claim 1, characterized in that: the connecting pipe (5) penetrates through the supporting plate (3) along the axial direction of the connecting pipe (5) and is in threaded connection with the supporting plate (3).
7. An air sampling clip to be used in uncertainty assessment according to claim 1, characterized in that: the position of the periphery of the connecting pipe (5), which is close to the clamping pipe (6), is fixedly connected with a baffle (51) which is vertical to the axial direction of the connecting pipe (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910781127.4A CN110514484B (en) | 2019-08-23 | 2019-08-23 | Air sampling clamp applied to uncertainty evaluation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910781127.4A CN110514484B (en) | 2019-08-23 | 2019-08-23 | Air sampling clamp applied to uncertainty evaluation |
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| CN110514484A CN110514484A (en) | 2019-11-29 |
| CN110514484B true CN110514484B (en) | 2022-02-01 |
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|---|---|---|---|---|
| CN2485494Y (en) * | 2001-01-04 | 2002-04-10 | 彭派 | Valve for preventing pressure meter from blow out |
| CN201236994Y (en) * | 2008-08-15 | 2009-05-13 | 中芯国际集成电路制造(上海)有限公司 | Reflow-stopping reaction valve |
| CN203572693U (en) * | 2013-11-14 | 2014-04-30 | 丹东百特仪器有限公司 | Automatic membrane replacing device of multi-filtration membrane environment air particulate matter sampler |
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| CN110514484A (en) | 2019-11-29 |
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