CN110672281A - Gas leakage detection probe and gas tightness detection device - Google Patents
Gas leakage detection probe and gas tightness detection device Download PDFInfo
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- CN110672281A CN110672281A CN201910914664.1A CN201910914664A CN110672281A CN 110672281 A CN110672281 A CN 110672281A CN 201910914664 A CN201910914664 A CN 201910914664A CN 110672281 A CN110672281 A CN 110672281A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
- G01M3/205—Accessories or associated equipment; Pump constructions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
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- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The embodiment of the application belongs to the field of leakage gas detection, and relates to a gas leakage detection probe. The probe comprises a probe body, an outer tube, an inner tube and an air supply part, wherein the rear end of the inner tube is communicated with the probe body, the outer tube is sleeved outside the inner tube, one end of the outer tube is communicated with the air supply part, the other end of the outer tube corresponds to the front end of the inner tube, the air supply part blows air to the outside through the outer tube to form an air curtain consisting of at least one air flow, and a surrounding or semi-surrounding space is formed in the area of the front end of the inner tube of the air curtain. The inner tube only can extract gaseous transmission to the mass spectrograph and detect in closed region, take place to reveal when the object that awaits measuring to under the state that has produced the diffusion, the air curtain that the outer tube produced prevents that the gaseous region that sneaks into the inner tube front end of awaiting measuring of diffusion in the middle of, only when crack or the pinhole on inner tube front end and the object that awaits measuring are in the inboard of air curtain simultaneously, the inner tube front end just can catch the gas that awaits measuring, has promoted its accuracy that detects crack or pinhole on the object that awaits measuring greatly.
Description
Technical Field
The present invention relates to leakage gas detection, and more particularly, to a gas leakage detection probe and a gas tightness detection apparatus.
Background
The gas must be stored in a sealed container due to its fluidity and diffusivity, and during storage, the gas may leak, and at this time, the leak must be detected. In some use scenes, gas is usually stored in containers with good pressure resistance, such as metal, glass, hard plastic and the like, the leakage of the containers may occur only through a pinhole or a crack with a very small area, the leakage points are usually difficult to detect only by manpower, a probe needs to be introduced to be matched with a mass spectrometer for detection, usually, the probe is provided with a capillary pipeline, the gas is continuously pumped into the mass spectrometer for real-time detection through a siphon principle to judge the type of the pumped gas, and the position where the leakage occurs is determined through the method.
However, because the gas flows and diffuses, the conventional gas detection method has low precision and cannot accurately determine the leakage position, and the leakage position is usually vacuum or a tiny crack, so that the difficulty of checking the leakage position is increased.
Disclosure of Invention
The technical problem that this application embodiment will solve provides a probe, the last position that gas was revealed of detection airtight container that can be accurate.
In order to solve the above technical problem, an embodiment of the present application provides a gas leakage detection probe, which adopts the following technical scheme:
a gas leak detection probe, characterized by: including probe body, outer tube, inner tube and air feed spare, the rear end and the probe body intercommunication of inner tube, the outside at the inner tube is established to the outer pipe box, the one end and the air feed spare intercommunication of outer tube, the other end correspond with the front end of inner tube, and air feed spare blows to the external world through the outer tube to form the air curtain of compriseing at least one air current, the air curtain forms the space that surrounds or partly surrounds in the region of inner tube front end.
Furthermore, the front end of the outer pipe is provided with an expansion opening, the front end of the inner pipe is provided with an expansion part corresponding to the shape of the expansion opening, and an air passage is formed between the expansion part and the expansion opening.
Furthermore, the front end of the inner tube is also provided with a protruding part, and the front end of the inner tube extends to the end part of the protruding part and is communicated with the outside.
Furthermore, the rear end of the outer tube is provided with a gas collection part, the gas collection part is communicated with the gas supply piece, the gas collection part is communicated with the front end of the outer tube, and the front end of the gas collection part is provided with an inclined plane extending inwards.
Further, the rear end of inner tube is provided with the installation department, the outside at the probe body is established to the installation department cover, the lateral wall of installation department is provided with the jackscrew, the jackscrew is radially with probe body butt, fixed probe body and inner tube.
Furthermore, silica gel with a sealing function is filled between the inner tube and the probe body.
Further, the rear end of the outer tube is screwed to the inner tube, and in an assembled state, an end surface of the rear end of the outer tube abuts against the mounting portion.
Further, the probe body includes capillary and filter, the one end and the mass spectrometer of capillary are connected, the filter sets up the other end of capillary, the outside at the filter is established to the installation department cover.
In order to solve the technical problem, the application further provides an air tightness detection device which comprises the gas leakage detection probe and a mass spectrometer.
Compared with the prior art, the embodiment of the application mainly has the following beneficial effects: through setting up outer tube and inner tube to absorb external gas through the inner tube and carry to the probe body, simultaneously, blow to the outer tube through air feed spare, the outer tube cover is established in the outside of inner tube, under the cooperation of air feed spare, blow to the outside and near the front end of inner tube forms the air curtain, form closed area between the front end of inner tube and the object that awaits measuring, the inner tube only can extract gas transmission to the mass spectrograph in this closed area and detect, it reveals to take place to appear when the object that awaits measuring, and under the state of diffusion has been produced, the air curtain that the outer tube produced prevents that the gas that awaits measuring of diffusion from sneaking into in the middle of the region that the inner tube front end corresponds, only when crack or needle eye on inner tube front end and the object that awaits measuring are in the inboard of air curtain simultaneously, the gas that awaits measuring is caught to the inner tube front.
Drawings
In order to illustrate the present application or prior art more clearly, a brief description of the drawings needed for the description of the embodiments or prior art will be given below, it being clear that the drawings in the following description are some embodiments of the present application and that other drawings can be derived from them by a person skilled in the art without inventive effort.
FIG. 1 is a prior art illustration of a use scenario and focus of the present application;
FIG. 2 is a schematic diagram of a gas leak detection probe according to the present application;
fig. 3 is a schematic view of the air flow direction in the working state of the present application.
Reference numerals:
1-probe body, 11-capillary tube, 12-filter, 2-external tube, 21-expansion opening, 22-gas-collecting portion, 3-internal tube, 31-expansion portion, 32-projection portion, 33-mounting portion and 4-gas-supplying piece.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1 is a prior art to which the present application is directed, in the process of detecting a gas leakage in the prior art, because the gas is diffused in a large area after the gas leakage, the probe can detect the leaked exhaust gas in a large range, so that it is difficult to accurately determine the accurate position of the leakage point.
Embodiment one of the present application relates to a gas leakage detection probe
As shown in fig. 2 and 3, the present application provides a gas leak detection probe including: a probe body 1, an outer tube 2, an inner tube 3, and a gas supply member 4.
Referring to fig. 2, the inner tube 3 is communicated with the probe body 1, the outer tube 2 is sleeved outside the inner tube 3, one end of the outer tube 2 is communicated with the air supply member 4, the other end of the outer tube corresponds to the front end of the inner tube 3, and the air supply member 4 blows air to the outside through the outer tube 2 to form an air curtain surrounding the front end of the inner tube 3. In the collecting state, the air supply 4 blows air into the outer tube 2, the air flow is sprayed through the front end of the outer tube 2 to form an air curtain consisting of at least one air flow, and the air curtain forms a surrounding or semi-surrounding space in the area of the front end of the inner tube 3. In an embodiment, the formed air curtain is sleeved outside the front end of the inner tube 3 to form a sealed area, the inner tube 3 collects gas, at this time, only the gas in the sealed area can be collected, and the gas outside the sealed area cannot diffuse into the sealed area, so that only when the leakage point of the object to be measured is in the sealed area, the inner tube 3 can collect the gas leaked by the object to be measured. The air supply member 4 may be an air compressor or an air pump connected to an air source, and forms an air curtain at the front end of the outer tube 2 by supplying air or protective gas into the outer tube 2. In another embodiment, the air flow is ejected through one or more openings at the front end of the outer tube 2, forming a spaced air curtain at the front end of the inner tube 3, forming a semi-enclosed space in the region of the front end of the inner tube 3.
The outer tube is used for generating an air curtain for closing the corresponding area of the front end of the inner tube, and is set to be in any shape including but not limited to a circle or a polygon according to the structure of the probe in the actual operation process. It is preferable to arrange the outer pipe in a circular shape so that the outlet of the outer pipe can continuously and uniformly blow air and form an air curtain. In the operation process, a pinhole or a gap is formed on the surface of the object to be detected, the gas leakage detection probe is close to the surface of the object to be detected, the outer tube blows outwards, and a closed space is formed between the outer tube and the surface of the object to be detected. The distance between the gas leakage detection probe and the surface of the object to be detected is adapted to the gas pressure of the protective gas output by the outer pipe, if the gas leakage detection probe is close to the surface of the object to be detected, the gas curtain is sprayed on the surface of the object to be detected to form turbulent flow, and the turbulent flow is mixed with the gas to be detected, so that the stability of the gas flow in the closed space is influenced; if the gas leakage detection probe is far away from the surface of the object to be detected, the gas sprayed by the outer pipe cannot be matched with the object to be detected to generate a closed gas curtain, and gas leakage is easy to generate. Drive gas leakage detection device in highly moderate position, move on the surface of the object that awaits measuring for the airtight space that forms between air curtain and the object that awaits measuring moves on the surface of the object that awaits measuring, the inner tube extracts the gas in the airtight space, when pinhole or crack are not in airtight region, the inner tube extraction is protective gas, supporting mass spectrum detector can not detect the gas that awaits measuring, even if around the gas that awaits measuring has diffused, because the shutoff of the gas curtain, the inner tube still can't absorb the gas that awaits measuring in airtight space. When the pinhole or the crack is positioned in the closed area, the inner tube can absorb the gas to be detected, the existence of the gas to be detected is detected through the matched mass spectrum detector, and the searching range can be greatly limited due to the fact that the surface area of the closed space to the object to be detected is limited, and the position of the pinhole or the crack is determined. When the air current passes through outer tube 2, when 3 front ends of inner tube formed half encirclement space, still can guarantee that gaseous pollutants can not pour into this half encirclement space in the middle of from the external world, keep the accuracy that the gas leakage detected.
The scheme eliminates the interference of leaked gas diffusion on gas detection, and is favorable for accurately searching the leakage position of the object to be detected.
Further, referring to fig. 2 and 3, the front end of the outer tube 2 is provided with a swelling opening 21, the front end of the inner tube 3 is provided with a swelling portion 31 corresponding to the shape of the swelling opening 21, and an air passage of the outer tube 2 is formed between the swelling portion 31 and the swelling opening 21. The outer tube 2 is sleeved on the outer side of the inner tube 3, an annular air passage is formed in the outer tube 2 by measuring and matching the wall of the outer tube 2 of the inner tube 3, and the air supply piece 4 supplies air to the annular air passage. The mouth 21 that rises that sets up at the front end of outer tube 2, it is corresponding with the inflation portion 31 that the inner tube 3 front end set up, make to rise and form the air flue that extends to the outer tube 2 axial outside between mouth 21 and the inflation portion 31, under the drive of air feed spare 4, gaseous outside to outer tube 2 axial in this air flue flows, and form the air curtain of spraying to the outer tube 2 axial outside at the mouth of pipe, so can prevent effectively that the air curtain from diffusing to the inner tube 3 front end and being absorbed by inner tube 3, avoid consequently causing the gaseous concentration reduction of awaiting measuring and influence the precision that detects. In order to control the stability of the air curtain output by the outer pipe, the part of the air passage in the expansion opening can be smaller than the part of the air passage in the outer pipe main body, so that higher pressure can be formed at the expansion opening to form a spraying effect, the output pressure of the air curtain can be stabilized, and the air curtain is stabilized.
Further, the front end of the inner tube 3 described with reference to fig. 2 is further provided with a protruding portion 32, and the front end of the inner tube 3 extends to the end of the protruding portion 32 and is communicated with the outside.
The inner tube 3 extracts gas in the environment through the front end, the gas is transmitted to a mass spectrometer through the probe body 1 for detection, when the leaked gas is detected, it is indicated that a leakage point exists in a region near the front end of the probe, the air or protective gas emitted from the front end of the outer tube 2 forms an air curtain to isolate the atmosphere inside the air curtain from the atmosphere outside the air curtain, so that the gas to be detected outside the air curtain cannot enter the inside of the air curtain through diffusion, the probe is favorable for eliminating the interference of the diffused gas to the atmosphere around the end part of the inner tube 3, but the air curtain is easily influenced by turbulence and other gas flow factors, the diffusion is generated towards the direction of the inner tube 3 and is absorbed by the inner tube 3 to influence the judgment of the mass spectrometer, after the matched expansion port 21 and the expansion part 31 are arranged, the air and the protective gas emitted from the outer tube 2 are emitted towards the outside direction of the axis of the outer tube, effectively reduced the degree of the diffusion of air or protective gas to 3 front ends of inner tube place regions, set up bulge 32, make the department of inner tube 3 further extend to the front end, the position of so sampling can be further keep away from the air curtain, make the further reduction of the degree of air and protective gas diffusion to 3 front ends of inner tube in the air curtain, the effectual precision that promotes the sample of inner tube 3, set up bulge 32 simultaneously and make the sampling point under the state of gathering, can be more close to the surface of the object that awaits measuring, the sample of also being more convenient for.
Further, referring to fig. 2, a gas collecting portion 22 is disposed at the rear end of the outer tube 2, the gas collecting portion 22 is communicated with the gas supply member 4, the gas collecting portion 22 is communicated with the front end of the outer tube 2, and an inclined plane extending inward is disposed at the front end of the gas collecting portion 22.
Air or protective gas are sent into to gas supply spare 4 in to gas collection portion 22, and air or protective gas assemble in gas collection portion 22, and the tolerance is sufficient, assembles through tip inwardly extending's inclined plane, and stable outside 2 front end output air of pipe, the outer tube 2 front end output air pressure can effectively be guaranteed to this scheme, prevents to gush into the region of inner tube 3 front end because the air pressure is unstable air or protective gas in forming the air curtain is incomplete and the air curtain to this precision that improves the detection. Specifically, the gas collecting part 22 functions to collect gas, so that the cross section of the gas collecting part 22 is larger than that of the middle gas passage of the outer tube 2 to collect more gas and form stable pressure at the joint with the middle gas passage of the outer tube 2, and driving air or protective gas is input into the middle gas passage of the outer tube 2 under the driving of the stable pressure to output and form a stable air curtain. The inclined plane is arranged at the joint of the gas collecting part 22 and the middle gas passage of the outer tube 2, so that gas can be collected more effectively to stabilize the gas pressure.
Further, referring to fig. 2, the rear end of the inner tube 3 is provided with an installation part 33, the installation part 33 is sleeved on the outer side of the probe body 1, the side wall of the installation part 33 is provided with a jackscrew, and the jackscrew radially abuts against the probe body 1 to fix the probe body 1 and the inner tube 3. This scheme can effectively strengthen the fixed between inner tube 3 and the probe body 1, effectively prevents to take place the dislocation between probe body 1 and the inner tube 3.
Further, silica gel for sealing is filled between the inner tube 3 and the probe body 1, so that the rear end of the inner tube 3 is isolated from the outside. This scheme is favorable to guaranteeing the airtight between probe body 1 and the inner tube 3.
Further, the rear end of the outer tube 2 is screwed to the inner tube 3, and in the assembled state, the end surface of the rear end of the outer tube abuts against the mounting portion 33. Through threaded connection, can guarantee the joint strength between outer tube 2 and the inner tube 3 simultaneously to guarantee the airtight between outer tube 2 and the inner tube 3, accomplish the butt between the bottom and the installation department 33 of inner tube 3 after the installation simultaneously, can effectively promote the stability of outer tube 2 in the axial direction, be favorable to in the middle of the process of air feed 4 air supplies, prevent that outer tube 2 from taking place the shake.
Further, probe body 1 includes mass spectrometer (not marked in the figure), capillary 11 and filter 12, the one end and the mass spectrometer of capillary 11 are connected, filter 12 sets up the other end of capillary 11, the outside at filter 12 is established to installation department 33 cover. Be provided with capillary 11 in the probe body 1, easily blockked up by impurity, cause scrapping of device, through setting up the filter tip that can dismantle, filter impurity, under the state that impurity blockked up the filter tip, can promote the life-span of integrated device through changing the filter tip to be favorable to the quick maintenance to the probe.
An embodiment of a gas tightness detection device is as follows:
the present embodiment includes the solution described in the first embodiment of the gas leakage detection probe, the gas leakage detection probe is connected to a mass spectrometer, the gas tightness detection device includes, but is not limited to, an optional suction mechanism for generating a negative pressure environment and an exhaust gas treatment mechanism for treating exhaust gas, and the gas tightness detection device can accurately detect a gas leakage position.
Referring to fig. 2, the inner tube 3 of the gas leakage detection probe is communicated with the probe body 1, the outer tube 2 is sleeved outside the inner tube 3, one end of the outer tube 2 is communicated with the gas supply member 4, the other end of the outer tube corresponds to the front end of the inner tube 3, and the gas supply member 4 blows to the outside through the outer tube 2 to form a wind curtain surrounding the front end of the inner tube 3. Under the collection state, air feed spare 4 blows to outer tube 2, the air current sprays through the front end of outer tube 2 and forms the air curtain, the air curtain cover that forms is established in the outside of 3 front ends of inner tube, form a sealed region, inner tube 3 gathers gas, only can gather the gas in the sealed region this moment, and the gas outside the sealed region can't spread in this sealed region, consequently only when the exposure point of the object that awaits measuring is in this sealed region, inner tube 3 just can gather the gas that the object that awaits measuring revealed and transmit to the mass spectrograph. The air supply member 4 may be an air compressor or an air pump connected to an air source, and forms an air curtain at the front end of the outer tube 2 by supplying air or protective gas into the outer tube 2.
Wherein the outer tube 2 functions to generate an air curtain for closing a corresponding region of the front end of the inner tube, and is configured in any shape, including but not limited to a circle or a polygon, according to the structure of the gas leakage detecting probe during the actual operation. It is preferable to arrange the outer pipe in a circular shape so that the outlet of the outer pipe can continuously and uniformly blow air and form an air curtain. In the operation process, a pinhole or a gap is formed on the surface of the object to be detected, the gas leakage detection probe is close to the surface of the object to be detected, the outer tube blows outwards, and a closed space is formed between the outer tube and the surface of the object to be detected. The distance between the gas leakage detection probe and the surface of the object to be detected is adapted to the gas pressure of the protective gas output by the outer pipe, if the gas leakage detection probe is close to the surface of the object to be detected, the gas curtain is sprayed on the surface of the object to be detected to form turbulent flow, and the turbulent flow is mixed with the gas to be detected, so that the stability of the gas flow in the closed space is influenced; if the gas leakage detection probe is far away from the surface of the object to be detected, the gas sprayed by the outer pipe cannot be matched with the object to be detected to generate a closed gas curtain, and gas leakage is easy to generate. Drive gas leakage detection device in highly moderate position, move on the surface of the object that awaits measuring for the airtight space that forms between air curtain and the object that awaits measuring moves on the surface of the object that awaits measuring, the inner tube extracts the gas in the airtight space, when pinhole or crack are not in airtight region, the inner tube extraction is protective gas, supporting mass spectrum detector can not detect the gas that awaits measuring, even if around the gas that awaits measuring has diffused, because the shutoff of the gas curtain, the inner tube still can't absorb the gas that awaits measuring in airtight space. When the pinhole or the crack is positioned in the closed area, the inner tube can absorb the gas to be detected, the existence of the gas to be detected is detected through the matched mass spectrum detector, and the searching range can be greatly limited due to the fact that the surface area of the closed space to the object to be detected is limited, and the position of the pinhole or the crack is determined. In order to ensure that the height of the gas leakage detection probe is within the operation allowable range, in one embodiment, the outer side sleeve of the gas leakage detection probe is provided with a support to limit the distance between the gas leakage detection probe and an object to be detected, the support is propped against the object to be detected in the detection process, the object to be detected is detected at a proper distance through the gas leakage detection probe, the air curtain generated at the moment can be matched with the object to be detected to form a closed space, overlarge airflow generated on the foreign currency of the object to be detected is avoided, the gas to be detected is blown away, and the reliability of the device can be further improved.
The scheme eliminates the interference of leaked gas diffusion on gas detection, and is favorable for accurately searching the leakage position of the object to be detected.
It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.
Claims (9)
1. A gas leak detection probe, characterized by: including probe body, outer tube, inner tube and air feed spare, the rear end and the probe body intercommunication of inner tube, the outside at the inner tube is established to the outer pipe box, the one end and the air feed spare intercommunication of outer tube, the other end correspond with the front end of inner tube, and air feed spare blows to the external world through the outer tube to form the air curtain of compriseing at least one air current, the air curtain forms the space that surrounds or partly surrounds in the region of inner tube front end.
2. The gas leak detection probe of claim 1, wherein: the front end of the outer pipe is provided with an expansion opening, the front end of the inner pipe is provided with an expansion part corresponding to the shape of the expansion opening, and an air passage is formed between the expansion part and the expansion opening.
3. The gas leak detection probe of claim 2, wherein: the front end of the inner tube is also provided with a protruding part, and the front end of the inner tube extends to the end part of the protruding part and is communicated with the outside.
4. A gas leak detection probe according to any one of claims 1 to 3, wherein: the rear end of the outer pipe is provided with a gas collecting part, the gas collecting part is communicated with the gas supply piece, the gas collecting part is communicated with the front end of the outer pipe, and the front end of the gas collecting part is provided with an inclined plane extending inwards.
5. The gas leak detection probe according to claim 4, characterized in that: the rear end of inner tube is provided with the installation department, the outside at the probe body is established to the installation department cover, the lateral wall of installation department is provided with the jackscrew, the jackscrew is radially with probe body butt, fixed probe body and inner tube.
6. The gas leak detection probe of claim 5, wherein: silica gel with sealing function is filled between the inner tube and the probe body.
7. The gas leak detection probe of claim 6, wherein: the rear end of the outer pipe is in threaded connection with the inner pipe, and in an assembled state, the end face of the rear end of the outer pipe is abutted to the mounting portion.
8. The gas leak detection probe of claim 7, wherein: the probe body includes capillary and filter, the one end and the mass spectrometer of capillary are connected, the filter sets up the other end of capillary, the outside at the filter is established to the installation department cover.
9. An air tightness detection device is characterized in that: comprising the gas leak detection probe of any one of claims 1 to 8 and a mass spectrometer.
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| CN201910914664.1A CN110672281A (en) | 2019-09-26 | 2019-09-26 | Gas leakage detection probe and gas tightness detection device |
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| CN201910914664.1A CN110672281A (en) | 2019-09-26 | 2019-09-26 | Gas leakage detection probe and gas tightness detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115218339A (en) * | 2022-06-17 | 2022-10-21 | 深圳华大智造科技股份有限公司 | Biological sample collection device and biological sample collection method |
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Application publication date: 20200110 |