CN109506845A - Test device and test method for the leak detection of pipeline weld seam - Google Patents
Test device and test method for the leak detection of pipeline weld seam Download PDFInfo
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- CN109506845A CN109506845A CN201811520154.8A CN201811520154A CN109506845A CN 109506845 A CN109506845 A CN 109506845A CN 201811520154 A CN201811520154 A CN 201811520154A CN 109506845 A CN109506845 A CN 109506845A
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- pipeline
- cover box
- weld seam
- leak
- sealing ring
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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
- G01M3/225—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 welds
-
- 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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- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The present invention provides a kind of test devices and test method for the leak detection of pipeline weld seam, and wherein test device includes that upper cover box (1), rectangle open tail sealing ring (2), snap ring compressing structure (3), lower cover box (4) and variable diameter dislocation open annular sealing ring (5)；Both the upper cover box (1) and lower cover box (4) are connected or separated by snap ring compressing structure (3), the junction of the two is provided with rectangle and opens tail sealing ring (2), when the two connection, inside is surrounded to form the first space, and first space is connected by detection mouth with external first pipeline；Variable diameter dislocation open annular sealing ring (5) is arranged at the detection mouth of upper cover box (1) and/or lower cover box (4).The present invention meets the requirement that spacecraft propulsion system pipeline weld seam leak rate high-precision, quickly detected, and leak detection measuring accuracy can be improved, shorten detection time, reduce leak rate testing cost.
Description
Technical field
The present invention relates to technical field of nondestructive testing, and in particular, to a kind of test device for the leak detection of pipeline weld seam
And test method more particularly to it is a kind of for spacecraft propulsion system pipeline weld seam leak detection method for rapidly testing and device.
Background technique
The sealing performance index of spacecraft is to measure the important parameter of the in-orbit service life of spacecraft, is developed in spacecraft
Stringent sealing performance detection is carried out in journey.Pipeline weld seam leak rate detection of the spacecraft propulsion system before carrying out general assembly test
It is the forced examination point of spacecraft development process, while is the precondition for guaranteeing its sealing performance.Propulsion system pipeline at present
Weld seam leak detection mostly uses the inspection of accumulation packet or bubble method to qualitatively judge, i.e., will be filled with certain pressure probe gas (generally helium)
Pipeline commissure is wrapped up by plastic film and is sealed, and after accumulation a period of time (typically no less than 10min), utilizes leak detector suction gun
Method will test the concentrations of helium of accumulation in the space deeply coated of popping one's head in, or be coated in pipeline weld seam with suds by bubble method
Place, the generation and size of visual observations bubble.Above method measuring accuracy is high, low efficiency, can not be to the true of pipeline weld seam
Leak rate carries out quantitative detection.It is imitated from improving propulsion system pipeline weld seam leak rate detection accuracy, shortening testing time, improving work
Rate guarantees that the angle of reliability of leak detection process is set out, and provides a kind of test device for the leak detection of pipeline weld seam and test side
Method is especially adapted for use in the method for rapidly testing and device necessity with higher of the leak detection of spacecraft propulsion system pipeline weld seam
And practicability.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of test devices for the leak detection of pipeline weld seam
And test method.
A kind of test device for the leak detection of pipeline weld seam provided according to the present invention, including upper cover box, that rectangle opens tail is close
Seal, snap ring compressing structure, lower cover box and variable diameter dislocation open annular sealing ring；
Both the upper cover box and lower cover box are connected or separated by snap ring compressing structure, and the junction of the two is provided with
Rectangle opens tail sealing ring, when the two connection when, inside is surrounded to form the first space, first space by detection mouth with it is external
First pipeline is connected；The variable diameter dislocation open annular sealing ring is arranged at the detection mouth of upper cover box and/or lower cover box.
Preferably, it is provided with interface on the upper cover box and/or lower cover box, be connected with the first pipeline.
Preferably, the interface is KF interface；First pipeline is corrugated stainless steel tubing or hose.
Preferably, first space includes one or more independent subspaces, and each subspace is mutual by detection mouth
Connection, every sub-spaces are correspondingly arranged on interface and pipeline.
Preferably, the upper cover box is connected with lower cover box by the tail structure protruded, and the rectangle is opened tail sealing ring and set
It sets in tail structure, plays sealing function.
Preferably, the variable diameter dislocation open annular sealing ring is rectangular ring sealing ring, and is provided with zigzag and axially cuts
Mouth and trapezoidal radial slot；The outer diameter of the variable diameter dislocation open annular sealing ring matches with detection mouth size, and internal diameter is little
In the outer diameter of pipeline to be detected.
Preferably, the snap ring compressing structure is the annular rigid structure of antirust material, can adjust pressing force, and
The compression junction of upper cover box and snap ring compressing structure is provided with pressing groove；And/or
The compression junction of lower cover box and snap ring compressing structure is provided with pressing groove.
A kind of test method for the leak detection of pipeline weld seam provided according to the present invention is used for pipeline weld seam using above-mentioned
The test device of leak detection, includes the following steps:
Detection preparation process: the test device for being used for the leak detection of pipeline weld seam is mounted on to the weld seam to be tested of pipeline to be detected
Place, and carry out background values test and leak rate calibration；
Leak rate detecting step: according to the weld seam quantity to be tested and pattern of pipeline to be detected, pass through pipeline using leak detector
One or more subspaces in the first space are evacuated to 1Pa hereinafter, and testing pipeline weld seam leak rate value with interface；
Calculation of leak rate discriminating step: propulsion system pipeline weld seam leak rate Q is calculated, and pipeline weld seam is leaked according to design objective
Rate carries out data interpretation；
Step is completed in detection: deflate according to the standard requirements of setting and device removes receipts.
Preferably, the detection preparation process further includes following sub-step:
Variable diameter dislocation open annular sealing ring installs sub-step: at the weld seam both ends to be tested of inflated pipeline to be detected
Or surrounding installs variable diameter dislocation open annular sealing ring respectively；
Cover box installs sub-step: one of upper cover box and lower cover box both parts are chosen, installation rectangle opens tail sealing ring, and
The variable diameter dislocation open annular sealing ring that successively will test mouth along pipeline direction and install is correspondingly embedded in, then by another portion
Part Matching installation, the pressing force sealing upper cover box and lower cover box set by snap ring compressing structure.
Preferably, in the detection preparation process, background values test and leak rate calibration are achieved by the steps of:
S1: intact pipeline any place both ends or around respectively installation variable diameter misplace open annular sealing ring；In selection
One of cover box and lower cover box both parts, installation rectangle opens tail sealing ring, and successively will test mouth and installation along pipeline direction
The variable diameter dislocation open annular sealing ring finished is correspondingly embedded in, and is then installed another parts match, is passed through snap ring compressing structure
Upper cover box and lower cover box are sealed with the pressing force of setting；
S2: according to the weld seam quantity to be tested and pattern of pipeline to be detected, using leak detector by pipeline and interface by the
One or more subspaces in one space are evacuated to 1Pa hereinafter, and testing pipeline background leak rate value；
S3: the valve before opening leak detection system Plays leak hole is tested after vacuum pressure is less than 1Pa by leak detector
Demarcate leak rate value.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, provided by the present invention for the leak detection of pipeline weld seam test device is simple and reliable for structure, leakproofness is good, can
The leak rate of quantitative detection pipeline weld seam；
2, various outer diameter, different-shape, no are able to detect provided by the present invention for the test device of pipeline weld seam leak detection
With consecutive number purpose pipeline weld seam leak rate, there is versatility, simplicity；
3, it provided by the present invention for the test method of pipeline weld seam leak detection, is tested, is improved by vacuum testing
Detection accuracy, shortens the testing time, and solving the leak detection of conventional tube weld seam, to need to wrap up accumulation, leak rate test accuracy low
The problems such as；
4, provided by the present invention for the test device and test method of the leak detection of pipeline weld seam, weld seam leak rate passes through quickly close
Detection means is sealed, fifth wheel is not introduced to propulsion system, clean and environmental protection has saved testing cost.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is that the device for the test method hunted leak provided by the present invention for pipeline weld seam connects preference schematic diagram；
Fig. 2 is the structural schematic diagram for the test device hunted leak provided by the present invention for pipeline weld seam；
Fig. 3 is the structural schematic diagram of upper cover box in the test device hunted leak provided by the present invention for pipeline weld seam；
Fig. 4 is the structural schematic diagram of lower cover box in the test device hunted leak provided by the present invention for pipeline weld seam；
Fig. 5 is variable diameter dislocation open annular sealing ring in the test device hunted leak provided by the present invention for pipeline weld seam
Structural schematic diagram；
Fig. 6 is the structural representation that rectangle opens tail sealing ring in the test device hunted leak provided by the present invention for pipeline weld seam
Figure.
It is shown in figure:
Upper cover box 1
Rectangle opens tail sealing ring 2
Snap ring compressing structure 3
Lower cover box 4
Variable diameter dislocation open annular sealing ring 5
Pipeline 6 to be detected
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention
Protection scope.
A kind of test device for the leak detection of pipeline weld seam provided according to the present invention, including upper cover box 1, that rectangle opens tail is close
Seal 2, snap ring compressing structure 3, lower cover box 4 and variable diameter dislocation open annular sealing ring 5；The upper cover box 1 and lower cover box 4 this
The two is connected or separated by snap ring compressing structure 3, and the junction of the two is provided with rectangle and opens tail sealing ring 2, when the two connects
When, inside is surrounded to form the first space, and first space is connected by detection mouth with external first pipeline；The variable diameter dislocation
Open annular sealing ring 5 is arranged at the detection mouth of upper cover box 1 and/or lower cover box 4.
Preferably, it is provided with interface on the upper cover box 1 and/or lower cover box 4, be connected with the first pipeline.The interface is
KF interface；First pipeline is corrugated stainless steel tubing or hose.First space includes that one or more independent sons are empty
Between, each subspace is connected with each other by detection mouth, and every sub-spaces are correspondingly arranged on interface and pipeline.1 He of upper cover box
Lower cover box 4 is connected by the tail structure of protrusion, and the rectangle is opened tail sealing ring 2 and is arranged in tail structure, is played sealing and is made
With.The variable diameter dislocation open annular sealing ring 5 is rectangular ring sealing ring, and is provided with zigzag axial cut-outs and trapezoidal radial direction
Notch；The outer diameter of the variable diameter dislocation open annular sealing ring 5 matches with detection mouth size, and internal diameter is not more than pipeline to be detected
6 outer diameter.The snap ring compressing structure 3 is the annular rigid structure of antirust material, can adjust pressing force, and
The compression junction of upper cover box 1 and snap ring compressing structure 3 is provided with pressing groove；And/or
The compression junction of lower cover box 4 and snap ring compressing structure 3 is provided with pressing groove.
A kind of test method for the leak detection of pipeline weld seam provided according to the present invention is used for pipeline weld seam using above-mentioned
The test device of leak detection, includes the following steps:
Detection preparation process: the test device for being used for the leak detection of pipeline weld seam is mounted on to the test weld to be measured of pipeline 6 to be detected
At seam, and carry out background values test and leak rate calibration；
Leak rate detecting step: according to the weld seam quantity to be tested and pattern of pipeline 6 to be detected, pass through pipeline using leak detector
One or more subspaces in the first space are evacuated to 1Pa hereinafter, and testing pipeline weld seam leak rate value with interface；
Calculation of leak rate discriminating step: propulsion system pipeline weld seam leak rate Q is calculated, and pipeline weld seam is leaked according to design objective
Rate carries out data interpretation；
Step is completed in detection: deflate according to the standard requirements of setting and device removes receipts.
Specifically, the detection preparation process further includes following sub-step:
Variable diameter dislocation open annular sealing ring installs sub-step: in the weld seam to be tested two of inflated pipeline 6 to be detected
End or surrounding install variable diameter dislocation open annular sealing ring 5 respectively；
Cover box installs sub-step: choosing one of upper cover box 1 and 4 both parts of lower cover box, installation rectangle opens tail sealing ring
2, and the variable diameter dislocation open annular sealing ring 5 that successively will test mouth along pipeline direction and install is correspondingly embedded in, and then will
Another parts match installation seals upper cover box 1 and lower cover box 4 by snap ring compressing structure 3 with the pressing force of setting.
In the detection preparation process, background values test and leak rate calibration are achieved by the steps of:
S1: intact pipeline any place both ends or around respectively installation variable diameter misplace open annular sealing ring 5；In selection
One of 4 both parts of cover box 1 and lower cover box, installation rectangle opens tail sealing ring 2, and successively will test mouth and peace along pipeline direction
It installs complete variable diameter dislocation open annular sealing ring 5 to be correspondingly embedded in, then another parts match is installed, is compressed and is tied by snap ring
Structure 3 seals upper cover box 1 and lower cover box 4 with the pressing force of setting；
S2: according to the weld seam quantity to be tested and pattern of pipeline 6 to be detected, using leak detector by pipeline and interface by the
One or more subspaces in one space are evacuated to 1Pa hereinafter, and testing pipeline background leak rate value；
S3: the valve before opening leak detection system Plays leak hole is tested after vacuum pressure is less than 1Pa by leak detector
Demarcate leak rate value.
More specifically, preference technical solution of the invention includes that upper cover box 1, lower cover box 4, rectangle are opened tail sealing ring 2, become
Diameter dislocation open annular sealing ring 5 and snap ring compressing structure 3, choose spacecraft propulsion system pipeline to be detected as to be checked
Test tube road 6；Upper cover box 1 is equipped with KF interface, and for connecting helium mass spectrometer leak detector, connecting line is corrugated stainless steel tubing or hose,
It is able to bear the negative pressure of 0.1MPa；The end face of lower cover box 4 is provided with rectangular seal slot, while according to propulsion system pipeline commissure
Structure can be provided with 2,3 or 4 annular mouths (corresponding with 1 structure of upper cover box)；Two ends that rectangle opens tail sealing ring 2 are
The tail portion of expansion, thickness is as thin as possible, structure type mainly compress sealing ring type seal, while play upper cover box 1, under
Sealing function at cover box 4 and annular mouth branch, wherein annular mouth is a part of detection mouth；Variable diameter dislocation open annular is close
Seal 5 is rectangular ring, is provided with zigzag axially with trapezoidal radial slot, outer diameter is the same as upper cover box 1,4 annular mouth size of lower cover box
Corresponding, to guarantee leakproofness, internal diameter is slightly less than propulsion system pipeline outer diameter, and (propulsion system pipeline outer diameter is generally 6mm, 8mm
Or 10mm)；Snap ring compressing structure 3 is arranged in 4 two sides of lower cover box according to practical pipeline weld seam leak detection situation, for stainless material annular
Rigid structure is provided with pressing groove in 1 pressed parts of upper cover box, can adjust pressing force according to different demands.The upper cover box 1,
Lower cover box 4 is stainless steel material, and seal face thickness is not less than 3mm, and cover box inner wall thickness is not less than 2mm, package unit energy
Enough bear the negative pressure of 0.1MPa；Two kinds of sealing rings are that fluorubber is made, and hardness is generally not more than 75；The rectangle opens tail sealing
2 exposing 4 end face part thickness of lower cover box of circle are higher than compression deflection, are embedded within segment thickness in annular opening as far as possible
Thin (being usually no more than 0.5mm)；The variable diameter dislocation open annular sealing ring 5 needs enough deflections in compression, it is ensured that
Its leakproofness can reach vacuum degree in cover box and be better than 1Pa.
Preferred test method of the invention includes the following steps:
A1, it is prepared by above-mentioned test device configuration, connects leak detection system and complete background values test and leak rate mark
It is fixed；
A2, pipeline inflation: the helium (search gas) of certain pressure is filled with to propulsion system pipeline as required；
A3, installation ring type seal: confirmation propulsion system pipeline weld seam position, in both ends (or weld seam surrounding, according to pipeline
Specific structure) variable diameter dislocation open annular sealing ring 5 is installed respectively, internal diameter of the seal ring and pipeline outer diameter are mating；
A4, installation lower cover box 4: opening tail sealing ring 2 for rectangle and be mounted on 4 end face of lower cover box, opens portion sealing ring abutting
On the inside of annular mouth, then 2 variable diameter dislocation open annular sealing rings 5 are embedded in by lower cover box 4 along propulsion system pipeline direction
In annular mouth, i.e., weld seam to be detected is placed in the first space；
A5, installation upper cover box: the upper cover box 1 for connecting leak detector is buckled in 4 top of lower cover box, makes pipeline embedded in upper cover box
In 1 annular mouth；
A6, fit sealing: it is closely sealed by the pressing groove internal pressure that the snap ring compressing structure 3 of lower cover box 4 is buckled in upper cover box 1；
A7, test leak rate: by will vacuumize in cover box (better than 1Pa), and pass through leak detector test cover box helium gas inside
Concentration output valve U3；
A8, weld seam leak rate is calculated；It is calculated by the following formula propulsion system pipeline weld seam leak rate Q:
A9, data interpretation: data interpretation is carried out to pipeline weld seam leak rate according to design objective.
The leak rate background values test and leak rate calibration are completed by following steps:
A10, test device are put in place, and are completed system connection by Fig. 1 and (prepared 1 leak rate Q0Known standard leakage
Hole)；
A11, pass through above-mentioned A1~A7, test the leak detector of intact pipeline (there is no the pipelines of weld seam) under the same conditions
Output valve U1；
A12, referance leak is opened, tests leak detector output valve U2。
In the above preferred test method, for same spacecraft propulsion system, one timing of pipeline outer diameter, background values and leak rate
Proving operation only carries out primary before the detection of weld seam leak rate.
Further, as shown in Figure 1, by the upper cover box of the device for quick testing of spacecraft propulsion system pipeline weld seam leak detection
1 is connected by KF interface (generally KF10, KF16) with leak detection system.Leak detection system is mainly by leak detector (helium mass spectrum leak detection
Instrument), referance leak, vacuum meter, valve, vacuum line and connection accessory composition, wherein leak detector have vacuum leak rate detection mould
Formula simultaneously has certain pumping speed (vacuumizing small space in cover box)；Referance leak is leak rate Q0Known vacuum standard leak hole；
Vacuum meter is that atmosphere is depressed into 10 for measuring vacuum pressure, range-2Pa；Valve has opening and closing function；Vacuum line and connection are matched
Each device and equipment connection are formed leak detection system as shown in Figure 1 by part.Device for quick testing is spacecraft propulsion system pipeline
The core component of weld seam leak rate detection, in leak rate detection process, propulsion system pipeline 6 needs to be filled with the helium of certain pressure
Gas (purity be greater than 99.99%), will vacuumize (1Pa or less) in cover box by leak detection system, and under differential pressure action, helium is from pipe
Leak source existing for 6 weld seam of road releases helium release and detects its leak rate value in cover box and through leak detector.Cover box needs to have
Standby certain leakproofness, apparatus of the present invention using rectangle open tail sealing ring 2 and variable diameter dislocation open annular sealing ring 5 compress it is close
Envelope mode, cover box is rectangular parallelepiped structure and inner space should not be too large, and annular opening is general according to the structure of propulsion system pipeline
It is 2~4, snap ring compressing structure 3 is distributed in 4 surrounding of lower cover box, plays auxiliary compression and fixed function.
Further, test method provided by the invention can specifically be completed by following steps:
Step 1, background calibration:
Upper cover box 1 is connect (valve is in close state) with leak detection system by KF interface by step 1；
Step 2 takes one section of weldless propulsion system pipeline, installs variable diameter dislocation open annular sealing ring respectively at both ends
5, sealing ring incision site is put in horizontal position；
Step 3, will install rectangle and opens the lower cover box 4 of tail sealing ring 2 variable diameter has misplaced split ring along pipeline direction
Shape sealing ring 5 is in annular mouth；
Upper cover box 1 is buckled in 4 top of lower cover box, makes pipeline 6 in 1 annular mouth of upper cover box, and pass through snap ring by step 4
Compressing structure 3 compresses sealing；
Step 5 vacuumizes (1Pa or less) by leak detector and tests background leak rate value U1.
Step 2, leak rate calibration:
Step 1, the valve before opening leak detection system Plays leak hole；
Step 2 tests helium leak rate value U2 by leak detector after vacuum pressure is less than 1Pa.
Step 3, the detection of pipeline weld seam leak rate:
Step 1 is prepared by above-mentioned apparatus and equipment；
Step 2 installs variable diameter dislocation open annular sealing ring 5 at 6 weld seam both ends (or around weld seam) of pipeline respectively, will be close
Seal incision site is put in horizontal position；
Step 3, will install rectangle and opens the lower cover box 4 of tail sealing ring 2 variable diameter has misplaced split ring along pipeline direction
Shape sealing ring 5 is in corresponding annular mouth；
Upper cover box 1 is buckled in 4 top of lower cover box, makes pipeline 6 in corresponding upper cover box annular mouth, and pass through by step 4
Snap ring compressing structure 3 compresses sealing；
Step 5 vacuumizes (1Pa or less) by leak detector and tests pipeline weld seam leak rate value U3.
Step 4, calculation of leak rate and interpretation: propulsion system pipeline weld seam leak rate Q is calculated by formula (1), and according to design
Index carries out data interpretation to pipeline weld seam leak rate, judges whether leak rate meets the requirements；
Step 5 is deflated, and device removes receipts:
Step 1 closes leak detection system；
Step 2 opens snap ring compressing structure 3, slowly opens upper cover box 1, deflate to cover box；
Step 3 successively remove receipts to equipment in order, and leak rate test terminates that (such as weld seam has many places, then carries out next weldering
Stitch leak rate test).
In the description of the present application, it is to be understood that term " on ", "front", "rear", "left", "right", " is erected at "lower"
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on the figure or position
Relationship is set, description the application is merely for convenience of and simplifies description, rather than the device or element of indication or suggestion meaning are necessary
It with specific orientation, is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow
Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (10)
1. a kind of test device for the leak detection of pipeline weld seam, which is characterized in that open tail sealing ring including upper cover box (1), rectangle
(2), snap ring compressing structure (3), lower cover box (4) and variable diameter dislocation open annular sealing ring (5)；
Both the upper cover box (1) and lower cover box (4) are connected or separated by snap ring compressing structure (3), the junction of the two
It is provided with rectangle and opens tail sealing ring (2), when the two connection, inside is surrounded to form the first space, and first space passes through inspection
Mouth is surveyed to be connected with external first pipeline；Variable diameter dislocation open annular sealing ring (5) is arranged in upper cover box (1) and/or lower cover
At the detection mouth of box (4).
2. the test device according to claim 1 for the leak detection of pipeline weld seam, which is characterized in that the upper cover box (1)
And/or it is provided with interface on lower cover box (4), it is connected with the first pipeline.
3. the test device according to claim 2 for the leak detection of pipeline weld seam, which is characterized in that the interface connects for KF
Mouthful；First pipeline is corrugated stainless steel tubing or hose.
4. the test device according to any one of claim 1 to 3 for the leak detection of pipeline weld seam, which is characterized in that institute
Stating the first space includes one or more independent subspaces, and each subspace is connected with each other by detection mouth, and every sub-spaces are equal
It is correspondingly arranged on interface and pipeline.
5. the test device according to claim 1 for the leak detection of pipeline weld seam, which is characterized in that the upper cover box (1)
It is connected with lower cover box (4) by the tail structure protruded, the rectangle is opened tail sealing ring (2) and is arranged in tail structure, plays
Sealing function.
6. the test device according to claim 1 for the leak detection of pipeline weld seam, which is characterized in that the variable diameter dislocation is opened
Choma shape sealing ring (5) is rectangular ring sealing ring, and is provided with zigzag axial cut-outs and trapezoidal radial slot；The variable diameter is wrong
The outer diameter of position open annular sealing ring (5) matches with detection mouth size, and internal diameter is not more than the outer diameter of pipeline to be detected (6).
7. the test device according to claim 1 for the leak detection of pipeline weld seam, which is characterized in that the snap ring compresses knot
Structure (3) is the annular rigid structure of antirust material, can adjust pressing force, and
The compression junction of upper cover box (1) and snap ring compressing structure (3) is provided with pressing groove；And/or
The compression junction of lower cover box (4) and snap ring compressing structure (3) is provided with pressing groove.
8. a kind of test method for the leak detection of pipeline weld seam is welded using pipeline is used for described in any one of any one of claims 1 to 77
Stitch the test device of leak detection, which comprises the steps of:
Detection preparation process: the test device for being used for the leak detection of pipeline weld seam is mounted on to the weld seam to be tested of pipeline to be detected (6)
Place, and carry out background values test and leak rate calibration；
Leak rate detecting step: according to the weld seam quantity to be tested and pattern of pipeline to be detected (6), using leak detector by pipeline and
One or more subspaces in the first space are evacuated to 1Pa hereinafter, and testing pipeline weld seam leak rate value by interface；
Calculation of leak rate discriminating step: calculate propulsion system pipeline weld seam leak rate Q, and according to design objective to pipeline weld seam leak rate into
Row data interpretation；
Step is completed in detection: deflate according to the standard requirements of setting and device removes receipts.
9. the test method according to claim 8 for the leak detection of pipeline weld seam, which is characterized in that the detection prepares step
Suddenly further include following sub-step:
Variable diameter dislocation open annular sealing ring installs sub-step: at the weld seam both ends to be tested of inflated pipeline (6) to be detected
Or surrounding installation variable diameter dislocation open annular sealing ring (5) respectively；
Cover box installs sub-step: choosing one of upper cover box (1) and lower cover box (4) both parts, installation rectangle opens tail sealing ring
(2), variable diameter dislocation open annular sealing ring (5) that and successively will test mouth along pipeline direction and install is correspondingly embedded in, with
Another parts match is installed afterwards, upper cover box (1) and lower cover box are sealed with the pressing force of setting by snap ring compressing structure (3)
(4)。
10. the test method according to claim 9 for the leak detection of pipeline weld seam, which is characterized in that the detection prepares
In step, background values test and leak rate calibration are achieved by the steps of:
S1: intact pipeline any place both ends or around respectively installation variable diameter dislocation open annular sealing ring (5)；Choose upper cover
One of box (1) and lower cover box (4) both parts, installation rectangle opens tail sealing ring (2), and successively will test mouth along pipeline direction
It is correspondingly embedded in variable diameter dislocation open annular sealing ring (5) installed, then another parts match is installed, passes through snap ring
Compressing structure (3) seals upper cover box (1) and lower cover box (4) with the pressing force of setting；
S2: according to the weld seam quantity to be tested and pattern of pipeline to be detected (6), pass through pipeline and interface for first using leak detector
One or more subspaces in space are evacuated to 1Pa hereinafter, and testing pipeline background leak rate value；
S3: the valve before opening leak detection system Plays leak hole passes through leak detector test calibration after vacuum pressure is less than 1Pa
Leak rate value.
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