CN107794525A - Cold spraying leak stopping encapsulating method for vacuum system - Google Patents
Cold spraying leak stopping encapsulating method for vacuum system Download PDFInfo
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- CN107794525A CN107794525A CN201711052712.8A CN201711052712A CN107794525A CN 107794525 A CN107794525 A CN 107794525A CN 201711052712 A CN201711052712 A CN 201711052712A CN 107794525 A CN107794525 A CN 107794525A
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- vacuum system
- leakage point
- leak stopping
- leak
- helium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
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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
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a kind of cold spraying leak stopping encapsulating method for vacuum system, comprise the following steps：The leakage point position of vacuum system is determined using leak hunting method；Size suitable nozzle is selected, adjusts nozzle angle, using cold spray technique, high-speed gas are using helium as probe gas to carrying out leak stopping with the leakage point determined；Spraying operation is implemented to the leakage point determined, spray area and spray time are determined according to the leakage situation of detection.Cold spraying leak stopping encapsulating method proposed by the present invention for vacuum system, convenient realize carry out leak stopping to vacuum system.
Description
Technical field
The present invention relates to vacuum system leakage checking and blocking technology field, more particularly to a kind of cold spraying for vacuum system to block up
Leak encapsulating method.
Background technology
As scientific and technological progress and the development of society, the application demand of vacuum system are increasingly extensive.Due to vacuum system cavity
External pressure is born, generally use intensity is higher and the preferable metal material of compactness manufactures.With the big volume of vacuum system volume
Change, necessarily increase at system table area and sealed connection, the leakage point for influenceing to vacuumize can be more, take out big volume vacuum system
Leakage checking and blocking difficulty increases during vacuum.Influenceing the principal element that vacuum system vacuumizes has inner air, vapor, material to put
Five gas, permeation, gas leakage factors, wherein inner air, vapor are objective reality factor, are excluded by vacuum；Material
Material is deflated, permeation is determined by physical characteristics of materials, and gas leakage is the factor that vacuum system must exclude as far as possible.The amount of vacuum system one has
Leakage point, it may directly result in and vacuumize and can not realize, therefore, the leakage point leak detection and leak stopping of vacuum system are very most important.
The leak detection of vacuum system and leak stopping mode are always to perplex a great problem of Vacuum Field, although current leak hunting method
Have a variety of, but suitable for big volume vacuum tank system and the stifled blocking method of effective leak detection and few, and leak detection is
Process, realize that final vacuumize is only purpose by leak stopping.The easy leak source of great Rong vacuum systems has：Bead crack, pipeline with
Vacuum valve junction, pipeline and expansion joint junction, each flange connections etc..For leak, traditional blocking method has：Weldering
Connect repair welding or sealed in weld seam external application picein wax or vacuum sealing grease.Due to welding process of patch weld category hot-working, work as use
During welding manner leak stopping, it is desirable to can not have pressure differential inside and outside vacuum system leakage point（It can not carry out and hold in vacuum
Device system can not repair welding with pressure）, surrounding environment can not have the conditions such as inflammable and explosive medium limitation；When using picein wax or vacuum
When envelope fat is sealed, due to picein wax or vacuum sealing grease category organic material, itself there is deflation characteristic can influence vacuum,
And its service life and use environment are limited.
The content of the invention
It is a primary object of the present invention to provide a kind of cold spraying leak stopping encapsulating method for vacuum system, it is intended to convenient
Leak stopping is carried out to vacuum system.
To achieve the above object, a kind of cold spraying leak stopping encapsulating method for vacuum system of present invention offer, including with
Lower step：
The leakage point position of vacuum system is determined using leak hunting method；
Size suitable nozzle is selected, adjusts nozzle angle, uses cold spray technique to carry out leak stopping to the leakage point determined, it is high
Fast gas is using helium as probe gas；
Spraying operation is implemented to the leakage point determined, spray area and spray time are determined according to the leakage situation of detection.
Preferably, behind the leakage point position that vacuum system is determined using leak hunting method, grinding process is carried out to leakage point and removed
Surface irregularities are gone it is exposed metallic luster.
Preferably, when carrying out leak stopping in vacuum system vacuum, vacuum system is connected with helium mass analyzer, is letting out
When leak source sprays helium, helium can enter inside vacuum system from leakage point by outside, and helium mass analyzer detects signal, that is, judge to work as
Before leakage point be present.
Preferably, when helium mass analyzer detection signal leak rate is reduced to zero, illustrate that leakage point is plugged completely, stop spraying and make
Industry.
Preferably, the leakage point position of vacuum system includes bead crack, pipeline and vacuum valve junction, pipeline and expansion
Save junction and flange connections.
Cold spraying leak stopping encapsulating method proposed by the present invention for vacuum system, have the advantages that：
1st, cold spray technique is applied to vacuum system sealing and plugging, realizes the lower temperature conditions in non-fusible metal material
Under, the leak stopping to metal base leakage point is realized using metal particulate material, reaches vacuum sealing effect, this method leak stopping uses
Long lifespan, it is low to environmental requirement, it is very easy to use；
High-speed gas during the 2nd, using helium as cold spraying accelerate metal particle, metal particle is sprayed at leak matrix table
Face and firm attachment, realize leak stopping purpose.Meanwhile helium is also acted as probe gas, as long as leak source is present or completely not stifled
Firmly, helium can be entered inside vacuum system by leak source, can be determined with by the helium mass analyzer being connected with vacuum system
Leak source is present, and reaches leak detection and determines the purpose of leakage point while can also examine the plugging effect of cold spraying operation.
Brief description of the drawings
Fig. 1 is that the present invention is used for the device structure schematic diagram that the cold spraying leak stopping encapsulating method of vacuum system uses；
Fig. 2 a are that the present invention is used for structural representation of the cold spraying leak stopping encapsulating method of vacuum system before weld leakage point is applied；
Fig. 2 b are that the present invention is used for structural representation of the cold spraying leak stopping encapsulating method of vacuum system after weld leakage point is applied；
Fig. 3 a are that the present invention is used for structural representation of the cold spraying leak stopping encapsulating method of vacuum system before flange leakage point is applied；
Fig. 3 b are that the present invention is used for structural representation of the cold spraying leak stopping encapsulating method of vacuum system after flange leakage point is applied.
In figure, 1- vacuum systems, 2- cold spraying nozzles, 3- vavuum pumps, 4- helium mass analyzers.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Reference picture 1, in this preferred embodiment, a kind of cold spraying leak stopping encapsulating method for vacuum system, including it is following
Step：
The leakage point position of vacuum system is determined using leak hunting method；
Size suitable nozzle is selected, adjusts nozzle angle, uses cold spray technique to carry out leak stopping to the leakage point determined, it is high
Fast gas is using helium as probe gas；
Spraying operation is implemented to the leakage point determined, spray area and spray time are determined according to the leakage situation of detection.
Specifically, behind the leakage point position that vacuum system is determined using leak hunting method, grinding process is carried out to leakage point and removed
Surface irregularities are gone it is exposed metallic luster.The leakage point position of vacuum system includes bead crack, pipeline and vacuum valve and connected
Place, pipeline and expansion joint junction and flange connections, i.e. this method are applied to above-mentioned zone.Vacuumized when in vacuum system
During carry out leak stopping when, vacuum system is connected with helium mass analyzer, leakage point spray helium when, helium can be from leakage point by outside
Into inside vacuum system, helium mass analyzer detects signal, that is, judges to there is currently leakage point.When helium mass analyzer detection signal is leaked
Rate is reduced to zero, illustrates that leakage point is plugged completely, stops spraying operation.
Vacuum system can be formed by connecting by single or multiple containers, pipeline, equipment by equipment such as pipeline, valves.Very
When empty set system vacuumizes, by external vacuum pump（Group）, because system space is mainly connected closed, theory by weld seam, flange etc.
Upper any position all there may be leak source.When vacuumizing, by leak hunting method, exceeded leakage point is found, that is, needs to carry out leak stopping.
In order to simplify description, cold spraying leak stopping is mainly formed such as Fig. 1：1- vacuum systems；2- cold spraying nozzles；3- vavuum pumps,（Such as
Fruit does not use helium mass spectrum leak detection, and 4- helium mass analyzers can omit）., may to whole system when in vacuum system vacuum
Leakage point is detected, and carries out scheme description respectively with regard to weld leakage point and flange connections leakage point below.
Fig. 2 a and Fig. 2 b carry out scheme description by leakage point of weld leakage point.Now, detailed process is as follows.
（1）Leak detection：Vacuum system, which vacuumizes, reaches certain vacuum degree, and when carrying out helium mass spectrometer leak, helium is sprayed such as at a
When, helium can be entered inside vacuum system at leakage point a by outside, and helium mass analyzer detects signal, that is, judges at weld seam a
Leakage point be present；
（2）Leak stopping：Grinding process is carried out to surrounding at weld seam a, the surface irregularities such as iron rust is removed, exposes metallic luster；
（3）Leak stopping is carried out using cold spray technique, high-speed gas use helium, and metal particle uses and vacuum system commissure gold
The metal particle of symbolic animal of the birth year matching；
（4）After helium is handled by acceleration, reach supersonic speed at a high speed, after cold spraying nozzle interior mixes with metal particle, warp
Cold spraying operation is carried out at nozzle alignment leakage point a；
（5）The helium sprayed out has part at a and entered in vacuum system after hitting and slowing down at a, now helium mass analyzer meeting
There is stronger detection signal, show that leak rate is larger.As cold spraying is persistently carried out, sprayed coating is constantly thickeied, and leakage point is sprayed at a
The micro- clipped wire applied, which is besieged it ring upon ring, to be filled up and seals, and is formed the sealant of densification, is reached leak stopping purpose；
（6）During leakage point is from starting being plugged completely at a, can through leakage point a enter vacuum system inside helium
Zero gradually is kept to, now, helium mass analyzer detection signal leak rate is also reduced to zero, illustrates that now leakage point is plugged completely at a.Cold spray
Apply leak stopping after such as Fig. 2 b.
The material that cold spray technique leak stopping sealing filling uses is metal, therefore, packing material and metal base（Weld seam）
With preferable blending, while filling metal, there is higher-strength to match with weld metal.With picein wax or vacuum seal
The mode of the leak stopping sealing of fat is compared, and cold spraying leak stopping mode long lifespan, can be used as sealed-for-life method.
Fig. 3 a and Fig. 3 b carry out scheme description by leakage point of flange connections.The method that vacuum system equipment junction uses
Orchid connection sealing, is influenceed by factors such as construction site condition, flange diameter, sealing ring forms, as flange is scratched, is easily formed
Leak source.Because there be certain distance at flange sealing surface and flange outer diameter edge, and gap is smaller between two flanges after connection, and equipment is set
It is standby to be not easy to reach at the sealing surface between two flanges.Therefore, flange connections leak detection and encapsulation process are difficult compared with weld seam.Using cold
Nozzle is not required to directly being contacted at leakage point when spraying leak stopping, and this method preferably solves this problem.Step is embodied in it
It is rapid as follows.
（1）Determined using leak hunting method at flange connections leakage point c；
（2）Flange sealing surface ring side is handled according to actual conditions, is advisable with exposing metallic luster；
（3）Size suitable nozzle is selected, adjusts nozzle angle；
（4）To implementing spraying operation at two flange seal face ring side leakages, determined whether according to testing result and leakage situation
Whole circle is needed to carry out spray seal coating.
Implement below in vacuum for two, whether the invention is not restricted to vacuum system is in vacuum shape
State, as long as leakage point is determined, do not limited by vacuum system operating mode, can carry out cold spraying operation leak stopping.This method also not by
Whether helium mass analyzer limitation is employed, in the case of no helium mass analyzer, as long as leakage point is determined, so that it may carry out cold
Spray plugging operations.
Cold spraying leak stopping encapsulating method proposed by the present invention for vacuum system, have the advantages that：
1st, cold spray technique is applied to vacuum system sealing and plugging, realizes the lower temperature conditions in non-fusible metal material
Under, the leak stopping to metal base leakage point is realized using metal particulate material, reaches vacuum sealing effect, this method leak stopping uses
Long lifespan, it is low to environmental requirement, it is very easy to use；
High-speed gas during the 2nd, using helium as cold spraying accelerate metal particle, metal particle is sprayed at leak matrix table
Face and firm attachment, realize leak stopping purpose.Meanwhile helium is also acted as probe gas, as long as leak source is present or completely not stifled
Firmly, helium can be entered inside vacuum system by leak source, can be determined with by the helium mass analyzer being connected with vacuum system
Leak source is present, and reaches leak detection and determines the purpose of leakage point while can also examine the plugging effect of cold spraying operation.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure transformation that bright specification and accompanying drawing content are made, or other related technical areas are directly or indirectly used in,
Similarly it is included within the scope of the present invention.
Claims (5)
1. a kind of cold spraying leak stopping encapsulating method for vacuum system, it is characterised in that comprise the following steps：
The leakage point position of vacuum system is determined using leak hunting method；
Size suitable nozzle is selected, adjusts nozzle angle, uses cold spray technique to carry out leak stopping to the leakage point determined, it is high
Fast gas is using helium as probe gas；
Spraying operation is implemented to the leakage point determined, spray area and spray time are determined according to the leakage situation of detection.
2. it is used for the cold spraying leak stopping encapsulating method of vacuum system as claimed in claim 1, it is characterised in that use leak detection side
After method determines the leakage point position of vacuum system, grinding process removing surface irregularities are carried out to leakage point makes it expose metal light
Pool.
3. it is used for the cold spraying leak stopping encapsulating method of vacuum system as claimed in claim 1, it is characterised in that when in vacuum system
When leak stopping is carried out in vacuum of uniting, vacuum system is connected with helium mass analyzer, and when leakage point sprays helium, helium can be from leakage
Point is entered inside vacuum system by outside, and helium mass analyzer detects signal, that is, judges to there is currently leakage point.
4. it is used for the cold spraying leak stopping encapsulating method of vacuum system as claimed in claim 3, it is characterised in that work as helium mass analyzer
Detection signal leak rate is reduced to zero, illustrates that leakage point is plugged completely, stops spraying operation.
5. the cold spraying leak stopping encapsulating method for vacuum system as described in any one in Claims 1-4, its feature exist
In the leakage point position of, vacuum system include bead crack, pipeline and vacuum valve junction, pipeline and expansion joint junction and
Flange connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711052712.8A CN107794525A (en) | 2017-10-30 | 2017-10-30 | Cold spraying leak stopping encapsulating method for vacuum system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711052712.8A CN107794525A (en) | 2017-10-30 | 2017-10-30 | Cold spraying leak stopping encapsulating method for vacuum system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107794525A true CN107794525A (en) | 2018-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711052712.8A Pending CN107794525A (en) | 2017-10-30 | 2017-10-30 | Cold spraying leak stopping encapsulating method for vacuum system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231131A (en) * | 2019-06-29 | 2019-09-13 | 广东利元亨智能装备股份有限公司 | Airtightness test technology |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800447A (en) * | 2004-12-21 | 2006-07-12 | 联合工艺公司 | Structural repair using cold sprayed aluminum materials |
| CN105910771A (en) * | 2016-05-30 | 2016-08-31 | 华电电力科学研究院 | Helium vacuum leak checking device |
-
2017
- 2017-10-30 CN CN201711052712.8A patent/CN107794525A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1800447A (en) * | 2004-12-21 | 2006-07-12 | 联合工艺公司 | Structural repair using cold sprayed aluminum materials |
| CN105910771A (en) * | 2016-05-30 | 2016-08-31 | 华电电力科学研究院 | Helium vacuum leak checking device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231131A (en) * | 2019-06-29 | 2019-09-13 | 广东利元亨智能装备股份有限公司 | Airtightness test technology |
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Application publication date: 20180313 |
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