CN203929337U - A kind of vacuum leak detection bag - Google Patents
A kind of vacuum leak detection bag Download PDFInfo
- Publication number
- CN203929337U CN203929337U CN201420077691.0U CN201420077691U CN203929337U CN 203929337 U CN203929337 U CN 203929337U CN 201420077691 U CN201420077691 U CN 201420077691U CN 203929337 U CN203929337 U CN 203929337U
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- Prior art keywords
- main body
- leak detection
- band
- detection bag
- lower seal
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Abstract
The utility model is a kind of vacuum leak detection bag, comprises turriform probe gas air intake opening, upper and lower main body, upper and lower band, leak detection groove, probe gas passage; In upper main body, the both sides of lower main body exposed face are bonding upper band respectively, and upper main body and lower main body fix as one and form leak detection bag main body, and the affixed face of upper and lower main body is gas leakage not; Leak detection bag main body has a sealed end and an openend, in upper main body, be provided with a turriform probe gas air intake opening, and turriform probe gas air intake opening is positioned at the position near sealed end, in lower main body and between openend and sealed end, be provided with leak detection groove, the soldered of leak detection groove and subject fits; The one side of lower seal band is taken up to the soldered one week of subject and overlapped with upper band, make to form pretightning force between upper and lower band, between soldered and leak detection bag main body, form the probe gas passage of a relative closure, turriform probe gas air intake opening communicates with probe gas passage, for passing into gas.
Description
Technical field
The utility model belongs to vacuum leak hunting technical field, relates to a kind of vacuum leak detection bag.
Background technology
The gas leakage of vacuum system or vacuum tank and other vacuum electronic components and parts is absolute, and air tight is relative.In vacuum leak hunting technology, the concept of " leakage " of indication and maximum allowed leakage link together.For dynamic vacuum system, as long as the equalized pressure of vacuum system can reach desired vacuum tightness, even if at this moment there is small opening, also can think that system do not leak; For permanent vacuum system, require in a certain time interval, intrasystem pressure energy maintains below allowed vacuum tightness, thinks that equally system do not leak.
Vacuum leak hunting is exactly will show to leak by certain means a certain side that material is added to the wall of tested workpiece, with instrument or a certain method opposite side suspect have the place of leakage to detect to overflow by small opening show leakage material, thereby reach inspection object.The program of leak detection is generally first to carry out the mensuration work of integral leakage, only has and exceeds after permissible value when integral leakage, then carry out the location work of small opening, and this is because of looking for the work of small opening position generally more difficult than leakage rate measurement work.
The method and apparatus of leak detection is a lot, according to used equipment, can be divided into helium mass spectrometer leak detector method, halogen leak detector method and other simple and easy leak detectings; According to the residing state of tested container, can be divided into pressure leakage detection method and vacuum testing again.Pressure leakage detection rule is shown leakage material for what tested container is filled with to certain pressure, if there is small opening on container, show that leaking material spills from small opening, with certain method or instrument container detect outward from small opening, spill show leakage material, thereby judge the existence of small opening, the particular location of small opening and leak rate size.Vacuum leak hunting rule be by the sensitive element of tested container and leakage detecting instrument all in vacuum, show that leaking material is applied to tested container outside, if tested container has small opening, show that leaking material just enters the space at container and leakage detecting instrument sensitive element place by small opening, by sensitive element, detect and to show leakage material, thus judge the existence, small opening size of small opening and it particular location.Common leak hunting method has static state boost method, discharge tube method, high-frequency spark leak detecting, vacuum gauge leak detecting, hydrogen-palladium method, halogen leak detector method, ionic pump leak detecting and helium mass spectrum leak detection method etc.
Helium mass spectrometer leak detector is owing to having the features such as highly sensitive, stable performance, is therefore widely used in vacuum leak hunting, and particularly in vacuum electronic components and parts and aerospace simulator manufacture process, the situation that the impermeability of parts is had relatively high expectations.Conventionally its impermeability requires maximum leak rate to be less than 5 * 10
-9pa m
3/ s, this also proposes harsher requirement to parts and whole leak detection work thereof.
The devices such as electron tube and aerospace simulator are before being assembled into integral body, for the leak detection of single part or parts, because its structure is relatively simple, weld seam is single, by common leak detection platform and supplementary means, determines that small opening is relatively simple.And for the leak detection being assembled into after integral body, due to its complex structure, weld seam is intensive or body is larger, in leak detection process, if whole leak rate does not meet the demands, for the location of small opening, be very difficult.
General existing leak detection flow process is: first with large sealing bag, cover whole subject, from sealing bag bottom, pass into helium, pass into after certain hour (the concrete time is looked subject size), by observing the helium mass spectrometer leak detector registration being connected with detected pieces, judge whether its whole leak rate meets the demands, if met the demands, the end-of-job of hunting leak.If its whole leak rate is greater than allowed maximum leak rate, need to carry out the work of small opening location.
Less for body, weld seam is not too intensive, is convenient to the subject of piecemeal cover sealing bag, and its small opening location work is relatively simple, specific implementation method is as follows: subject is divided into some bulks, cover successively from top to bottom sealing bag, then from sealing bag bottom, pass into helium, observe the helium mass spectrometer leak detector registration being connected with detected pieces, judge whether this quilt cover region exists small opening, if existed, helium tube is moved and finds out small opening position on the weld seam in this region, this region small opening location work completes.
Yet the body of actual subject is large or weld seam is intensive, and the situation that is not easy to piecemeal cover sealing bag is very common, re-uses above-mentioned small opening localization method, and small opening location is very difficult.These veteran personnel that conventionally need to hunt leak operate, and reasonably piecemeal leak detection, could accurately locate small opening fast, so this process is had higher requirement to leak detection operating personnel's specialized capability.Conventional cover sealing bag leak hunting method is in implementation process, because the gap between sealing bag and weld seam is larger, if be in the piecemeal end in the middle of subject, cover and between sealing bag and weld seam, do not form the good confined space of quality, therefore in leak detection process, need to pass into for a long time more helium, could locate small opening position, not only waste a large amount of helium but also waste time and energy.This needs corresponding auxiliary leak detection tool to hunt leak and the location to small opening.
Utility model content
(1) technical matters solving
For prior art to the body of subject is large or weld seam is intensive, small opening location is very difficult, be not easy to the problem that piecemeal cover sealing bag is hunted leak, and the drawback of in small opening position fixing process, operating personnel's specialized capability being had relatively high expectations, for this reason, the purpose of this utility model is to provide a kind of portable vacuum leak hunting bag.
(2) technical scheme
In order to reach described object, a kind of vacuum leak detection of the utility model bag, its structure mainly comprises: turriform probe gas air intake opening, upper main body, upper band, lower seal band, lower main body, leak detection groove, probe gas passage; Band on the both sides of upper main body exposed face difference is bonding, at the affixed lower seal band of the both sides of lower main body exposed face difference, upper main body and lower main body fix as one and form a leak detection bag main body, and affixed of upper main body and lower main body guarantees not gas leakage; Leak detection bag main body has a sealed end and an openend, in upper main body, be provided with a turriform probe gas air intake opening, and turriform probe gas air intake opening is positioned at the position near sealed end, in lower main body and between openend and sealed end, be provided with leak detection groove, the soldered of leak detection groove and subject fits; The one side of lower seal band is taken up to the soldered one week of subject and overlapped with upper band, make to form pretightning force between band and lower seal band; The probe gas passage that forms a relative closure between soldered and leak detection bag main body, turriform probe gas air intake opening communicates with probe gas passage, for passing into gas, forms vacuum leak detection bag.
(3) beneficial effect
The utility model is a kind of portable vacuum leak hunting bag, and the body that has solved prior art subject is large or weld seam is intensive, inconvenient piecemeal cover sealing bag leak detection, and small opening location is very difficult, wastes a large amount of helium, and the problem wasting time and energy; Use a kind of portable vacuum leak hunting bag described in the utility model, operating personnel's specialized capability has also been reduced to requirement, there are the operating personnel of basic leak detection general knowledge, use this utility model also can carry out small opening location to complicated weldment; The utility model a kind of portable vacuum leak hunting bag described in the utility model, due to weld seam between relative sealing better and the volume of probe gas passage less, so need a small amount of helium to detect in leak detection process, whether there is small opening.Its feature of the utility model is easy to carry, be convenient to irregular weld seam (as polygon etc.) and regular weld seam (as circular, oval etc.) to form confined space, being convenient to weldment that butt welded seam is intensive carries out a certain weld seam and hunts leak, being convenient to the subject that butt welded seam is intensive locates fast, and helium consumption is little, the cost such as use manpower and material resources sparingly, has stronger popularization practical value.
Accompanying drawing explanation
Fig. 1 a is the cut-open view of the utility model vacuum leak detection bag;
Fig. 1 b is A place sectional drawing in the cut-open view 1a of the utility model vacuum leak detection bag;
Fig. 1 c is B place sectional drawing in the cut-open view 1a of the utility model vacuum leak detection bag;
Fig. 2 is the utility model one embodiment subject structure and the schematic diagram that is connected with leak locator;
Fig. 3 is the partial 3 d schematic diagram at D place in the utility model one embodiment Fig. 2.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the utility model is further described.
The utility model vacuum leak detection bag three-dimensional structure is as shown in Fig. 1 a-Fig. 1 c, turriform probe gas air intake opening 1, upper main body 2, upper band 3, lower seal band 4, lower main body 5, leak detection groove 6, probe gas passage 7, sealed end 8, openend 9, band 3 on the both sides of upper main body 2 exposed faces difference is bonding, at the bonding lower seal band 4 of the both sides of lower main body 5 exposed faces difference, upper main body 2 is bonded as one and forms leak detection bag main body with lower main body 5, and affixed of upper main body 2 and lower main body 5 guarantees not gas leakage; Leak detection bag main body has a sealed end 8 and an openend 9, in upper main body 2, be provided with a turriform probe gas air intake opening 1, and turriform probe gas air intake opening 1 is positioned at the position near sealed end 8, in lower main body 5 and between openend 9 and sealed end 8, be provided with leak detection groove 6, leak detection groove 6 fits with the soldered of subject; The one side of lower seal band 4 is taken up to the soldered one week of subject and overlapped with upper band, make to form pretightning force between band 3 and lower seal band 4; The probe gas passage that forms a relative closure between soldered and leak detection bag main body, turriform probe gas air intake opening 1 communicates with probe gas passage, for passing into gas, forms vacuum leak detection bag.
Described upper main body 2 adopts one-body molded technology directly to inject leak detection bag main body with lower main body 5.
The material of described leak detection bag agent structure is for forming silicon rubber or nitrile rubber or the ACM material of seal chamber.
Described probe gas passage 7 is guide-tube structure passage or open architecture passage, described guide-tube structure passage square duct, circular channel; Open architecture passage is rectangular recess passage, semi-circular recesses passage.
Article two, upper band 3, two lower seal band 4 materials are that elastomeric material or nylon material are made.The elastomeric material of described upper band, lower seal band is styrene-butadiene-styrene block copolymer (SBS) material.
Described two upper bands 3 are with for velcro hooks, and two lower seal bands 4 are hemostasis using nylon button velvet ribbon, and velcro hooks band and hemostasis using nylon button velvet ribbon overlap joint, and formation has the bridging arrangement of certain pretightning force.
Described upper band 3 can also be that two upper caulking gum bands, lower seal bands 4 can also be two lower seal rubber strips, and lower seal rubber strip and upper caulking gum band overlap joint form the bridging arrangement with certain pretightning force; Or described upper band 3 is two upper caulking gum bands, described lower seal band 4 for sky be that the present embodiment is not used lower seal band 4, described two upper caulking gum bands overlap with lower main body 5 exposed faces the bridging arrangement that formation has certain pretightning force; Or described upper band 3 for sky be that the present embodiment is not used upper band 3, described lower seal band 4 is two lower seal rubber strips, described two lower seal rubber strips and upper main body 2 exposed faces overlap joints form the bridging arrangement with certain pretightning force.
For further explaining structure and the feature of a kind of vacuum leak detection of the utility model bag, use Fig. 1 a and Fig. 1 b to describe, after the one side of lower seal band 4 is taken up a week of subject soldered ii and is overlapped with upper band 3, lower main body 5 at leak detection groove 6 places, form the structure of similar " lip ", guaranteed the leakproofness with the combination of subject soldered ii, the structure of this similar " lip " has also guaranteed that probe gas arrives detected weld place accurately, and does not diffuse into other non-detected weld places.
For ease of concrete using method of the present utility model is described, especially exemplified by an embodiment.Fig. 2 is an embodiment subject structure and the schematic diagram that is connected with leak locator, in Fig. 2, E represents a certain subject, I to N label represents the adjacent weldment of welding successively of subject, i to n represents the weld seam that adjacent detected pieces welding forms successively, C represents leak locator, and B represents the gas pipeline that subject is connected with leak locator C.
Before implementing leak detection process, first subject E is connected with leak locator C with gas pipeline B, then start leak locator, the vacuum pump of leak locator will be bled to the internal cavity of subject E, when the pressure of subject E internal cavity is evacuated to below 100Pa, while forming certain pressure difference inside and outside the cavity wall of subject E, the preparatory stage completes.
The partial 3 d schematic diagram at D place in Fig. 3 the utility model one embodiment Fig. 2, in Fig. 3, II is the first weldment II, the first weldment is adjacent with the second weldment III, the soldered ii being formed by the first weldment II and the second weldment III, in Fig. 3, a is a kind of vacuum leak detection of the utility model bag.
Implementation process is as follows: first the leak detection groove 6 of the utility model vacuum leak detection bag a split shed end 9 is affixed with soldered ii to be checked, as shown in b direction in Fig. 3, lower main body 5 is overlapped around the one side hooking with 3 with velcro with upper main body 2 for a week of subject soldered ii to be checked with the one side of hemostasis using nylon button velvet ribbon 4, make velcro hook with 3 and hemostasis using nylon button velvet ribbon 4 between form certain pretightning force, now between subject soldered ii to be checked and leak detection bag main body, form the probe gas passage 7 of a relative closure, then by probe gas (being generally helium), from turriform probe gas air intake opening 1, pass into described probe gas passage 7, if there is small opening in soldered ii, inside and outside cavity wall due to subject E, there is certain pressure difference, probe gas can enter from the small opening of soldered ii in the cavity of subject E, then along gas pipeline B, enter in leak locator C, then observe helium mass spectrometer leak detector registration, can determine whether and have small opening.
Because the utility model vacuum is hunted leak bag in use, between leak detection bag and detected weld, form the leak detection space that leakproofness is good, so using the utility model vacuum leak detection bag can directly hunt leak to " suspicious " weld seam, locate fast small opening position, can jump out the general leak detection rule of " piecemeal leak detection, " from top to bottom.In the present embodiment, subject soldered ii to be checked is circular weld joint, but actual usable range is not limited to this type soldered, other structures such as that soldered type can be is square, polygon, ellipse.
A leak detection bag main body does not have concrete limiting demensions, and all have an above feature, all at the row of the utility model.
The above; it is only the embodiment in the utility model; but protection domain of the present utility model is not limited to this; any people who is familiar with this technology is in the disclosed technical scope of the utility model; can understand conversion or the replacement expected, all should be encompassed in of the present utility model comprise scope within.
Claims (10)
1. a vacuum leak detection bag, is characterized in that comprising: turriform probe gas air intake opening, upper main body, upper band, lower seal band, lower main body, leak detection groove, probe gas passage; Band on the both sides of upper main body exposed face difference is bonding, at the affixed lower seal band of the both sides of lower main body exposed face difference, upper main body and lower main body fix as one and form a leak detection bag main body, and affixed of upper main body and lower main body guarantees not gas leakage; Leak detection bag main body has a sealed end and an openend, in upper main body, be provided with a turriform probe gas air intake opening, and turriform probe gas air intake opening is positioned at the position near sealed end, in lower main body and between openend and sealed end, be provided with leak detection groove, the soldered of leak detection groove and subject fits; The one side of lower seal band is taken up to the soldered one week of subject and overlapped with upper band, make to form pretightning force between band and lower seal band, between soldered and leak detection bag main body, form the probe gas passage of a relative closure, turriform probe gas air intake opening communicates with probe gas passage, be used for passing into gas, form vacuum leak detection bag.
2. vacuum leak detection bag according to claim 1, is characterized in that: described upper main body and lower main body adopt one-body molded technology directly to inject a leak detection bag main body.
3. vacuum leak detection bag according to claim 1, is characterized in that: the material of described leak detection bag agent structure is silicon rubber or nitrile rubber or the ACM material that can form seal chamber.
4. vacuum leak detection bag according to claim 1, is characterized in that: described probe gas passage is guide-tube structure passage or open architecture passage.
5. vacuum leak detection bag according to claim 4, is characterized in that: described guide-tube structure passage square duct, circular channel.
6. vacuum leak detection bag according to claim 4, is characterized in that: described open architecture passage is rectangular recess passage, semi-circular recesses passage.
7. vacuum leak detection bag according to claim 1, is characterized in that: the material of described upper band, lower seal band is rubber or nylon.
8. vacuum leak detection bag according to claim 7, is characterized in that: described upper band is that velcro hooks band, and lower seal band is hemostasis using nylon button velvet ribbon, and velcro hooks band and hemostasis using nylon button velvet ribbon overlap joint, forms the bridging arrangement with certain pretightning force.
9. vacuum leak detection bag according to claim 7, is characterized in that: the elastomeric material of described upper band, lower seal band is styrene-butadiene-styrene block copolymer (SBS) material.
10. vacuum leak detection bag according to claim 9, is characterized in that:
Described upper band is that upper caulking gum band, lower seal band are lower seal rubber strip, and lower seal rubber strip and upper caulking gum band overlap joint form the bridging arrangement with certain pretightning force;
Or described upper band be upper caulking gum band, lower seal band for empty, upper caulking gum band and the formation of lower main body exposed face overlap joint have the bridging arrangement of certain pretightning force;
Or described upper band for empty, band be lower seal rubber strip, lower seal rubber strip and the formation of upper main body exposed face overlap joint have the bridging arrangement of certain pretightning force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420077691.0U CN203929337U (en) | 2014-02-24 | 2014-02-24 | A kind of vacuum leak detection bag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420077691.0U CN203929337U (en) | 2014-02-24 | 2014-02-24 | A kind of vacuum leak detection bag |
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| Publication Number | Publication Date |
|---|---|
| CN203929337U true CN203929337U (en) | 2014-11-05 |
Family
ID=51825137
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420077691.0U Withdrawn - After Issue CN203929337U (en) | 2014-02-24 | 2014-02-24 | A kind of vacuum leak detection bag |
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| Country | Link |
|---|---|
| CN (1) | CN203929337U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103776596A (en) * | 2014-02-24 | 2014-05-07 | 中国科学院电子学研究所 | Portable vacuum leak detection bag |
-
2014
- 2014-02-24 CN CN201420077691.0U patent/CN203929337U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103776596A (en) * | 2014-02-24 | 2014-05-07 | 中国科学院电子学研究所 | Portable vacuum leak detection bag |
| CN103776596B (en) * | 2014-02-24 | 2016-08-24 | 中国科学院电子学研究所 | A kind of vacuum leak detection bag |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141105 Effective date of abandoning: 20160824 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20141105 Effective date of abandoning: 20160824 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |