CN108871693B - A kind of leak hunting method for superconducting cyclotron vacuum chamber - Google Patents
A kind of leak hunting method for superconducting cyclotron vacuum chamber Download PDFInfo
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- CN108871693B CN108871693B CN201810726871.XA CN201810726871A CN108871693B CN 108871693 B CN108871693 B CN 108871693B CN 201810726871 A CN201810726871 A CN 201810726871A CN 108871693 B CN108871693 B CN 108871693B
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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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Abstract
The invention discloses a kind of leak hunting methods of superconducting cyclotron vacuum chamber, vacuumize including the use of molecule pump assembly and helium mass spectrometer leak detector to ring vaccum cryogenic thermostat chamber interior；When ring vaccum cryogenic thermostat chamber interior reaches required vacuum background state, helium is sprayed to the weld seam on thermostatic chamber using leak detection tool equipment, to examine thermostatic chamber with the presence or absence of leak source；If detecting thermostatic chamber weld seam, there are leak sources, the current weld seam of thermostatic chamber is marked；Weld seam detections whole on thermostatic chamber are finished, and leak source is marked；The position while welding for marking leak source is repaired one by one and is finished.The leak detection tool equipment includes rectangle leak detection end socket, and rectangle leak detection end socket is used to detect the leak rate on the major diameter circumferential weld of ring vaccum cryogenic thermostat room.The present invention overcomes prejudice, and using the method for vacuumizing+hunting leak the detection of end socket+segmentation, three mutually supported, interdependence, constitutes the new technical solution of solution major diameter weld seam and the Supreme People's Procuratorate's leak rate, has filled up domestic blank.
Description
Technical field
The present invention relates to main vacuum chamber's technologies of superconducting cyclotron, and in particular to a kind of superconducting cyclotron master is true
The leak hunting method of empty room.
Background technique
Superconducting cyclotron is one of important equipment of proton therapeutic.Proton therapeutic is that the current advanced tumour in the whole world is put
Treatment technology is penetrated, tumour can be treated using microcosmic proton, Heavy ion beam, and have to surrounding normal cell seldom
Injury and side effect, it is significant in efficacy, there is good development prospect and huge commercial value, at present only individual developed countries
It grasps and applies the technology.
The vacuum system of superconducting cyclotron is one of basic composition of superconducting cyclotron, and particle is in superconducting cyclotron
Cyclotron motion is done in acceleration cavity, it is accelerated to obtain energy by accelerating gap.The quality of vacuum degree is to line
Quality and beam loss have significant impact, therefore in order to guarantee good vacuum environment, need to guarantee the leak rate of entire vacuum chamber
No more than 1.0Xe-10mbarL/s.
Superconducting cyclotron vacuum chamber relative to conventional cyclotron vacuum chamber, the difference lies in that as shown in Figure 1,
Superconducting cyclotron uses the structure that vacuum chamber and cryostat are combined into one, and this structure can reduce superconducting cyclotron
The size of accelerator avoids the occurrence of interlayer between vacuum chamber and thermostat, but such structure is relatively complicated, leak detection difficulty
Greatly.
The structure is relatively complicated, be because superconducting cyclotron diameter it is relatively large, it is also embedding on major diameter inner wall
The major diameter weld seam for entering to have unlike material material and welding together two kinds of unlike materials.As shown in Figure 1, superconducting cyclotron
About 2 meters of acceleration cavity diameter, the weld seam of multiple tracks arc is along the circumferential direction gone up in about 2 meters of diameter of inner cylinders.It is described
One of big reason of difficulty of hunting leak, leak rate standard requirements are high, are generally (1.0Xe-2mbarL/s ~ 1.0Xe- to the requirement of leak rate
3mbarL/s)), or (1.0Xe-5mbarL/s ~ 1.0Xe-6mbarL/s), and the present invention claims leak rate be not more than 1.0Xe-
10mbarL/s, we generally use two that vacuum method detects the big reason of the leak detection difficulty under the requirement of this leak rate, by
In in the vacuum chamber interior walls that the weld seam in major diameter is circumferentially distributed in 2 meters of diameter, if using spray gun along weld seam
The method for spraying helium, since helium can drift about in the sky as gas, sprayed from non-welding gun when the helium to drift about other greatly
When weld seam diametrically enters vacuum chamber, it can only generally judge that there are leak sources for vacuum and low temperature thermostatic chamber, then can not determine specifically to leak
Weld seam whole welding or repair welding again can only be caused welding workload big, welding quality is more difficult by the position of point at this time
Guarantee, this method is infeasible.
Currently, the country there is no solution superconducting cyclotron vacuum chamber requirement leak rate for 1.0Xe-10mbarL/s and straight greatly
The precedent of diameter weld seam leak source detection, the present invention is to fill up this domestic blank and propose.
Summary of the invention
In view of the deficiencies of the prior art, the present invention proposes a kind of superconducting cyclotron vacuum chamber leak hunting method, purpose exists
Requiring leak rate in solution superconducting cyclotron is to detect no more than 1.0Xe-10mbarL/s and major diameter weld seam leak source
Problem.
The present invention is to solve its technical problem following scheme is taken to realize:
A kind of leak hunting method for superconducting cyclotron vacuum chamber, comprising the following steps:
Step 1: being vacuumized using molecule pump assembly and helium mass spectrometer leak detector to ring vaccum cryogenic thermostat chamber interior；
Step 2: utilizing leak detection work when ring vaccum cryogenic thermostat chamber interior reaches required vacuum background state
It fills and helium is sprayed to the weld seam on thermostatic chamber, to examine thermostatic chamber with the presence or absence of leak source；
Step 3: if detecting thermostatic chamber weld seam, there are leak sources, and the current weld seam of thermostatic chamber is marked；
Step 4: repeating Step 2: step 3, until weld seam detections whole on thermostatic chamber are finished, and adds leak source
With label；
Finished Step 5: the position while welding for marking leak source is repaired one by one, repeat step 2 ~ 4, successively to thermostatic chamber into
Row leak detection reinspection, until the whole leak rate of thermostatic chamber reaches design requirement；
It is characterized by:
The leak detection tool equipment includes rectangle leak detection end socket, and rectangle leak detection end socket is permanent for detecting ring vaccum low temperature
Leak rate above and below greenhouse major diameter circumference between weld seam on the closer weld seam of relative distance ratio.
Ring vaccum cryogenic thermostat room major diameter circumference is both the circumference in ring vaccum cryogenic thermostat room on cylinder,
About 2 meters of the diameter of the inner cylinder, circumferentially there is multiple tracks by mild steel and stainless steel welded arc on inner cylinder
Weld seam.
The closer weld seam of relative distance ratio is both between weld seam above and below the major diameter circumference of ring vaccum cryogenic thermostat room
Along the arc-shaped welding seam for the inner cylinder junction that the multiple tracks arc mild steel that inner cylinder circumferencial direction is laid is embedded in it.
The leak detection end socket are as follows: side is open and is open towards in thermostatic chamber inner cylinder and thermostatic chamber in the longitudinal direction
The approximate rectangle that cylinder curved surface matches, the approximation rectangle are additionally provided with one on another side opposite with opening direction
Columned jet cylinder that is a vertical and running through the side, the cylindric jet cylinder are used for external helium pipeline, and by helium from
Jet cylinder blows to the one side of the opening of corresponding leak detection end socket, and purges ring vaccum by the one side of leak detection end socket opening
Weld seam on cryogenic thermostat room.
It is described that the weld seam on thermostatic chamber is sprayed using detecting tool, specially using leak detection end socket first to phase on inner cylinder
Weld seam to position in top detects, then detects to relative position on inner cylinder in following weld seam.
It is described that the weld seam on thermostatic chamber is sprayed using detecting tool, it is specially low along ring vaccum using leak detection end socket
It is detected paragraph by paragraph in warm thermostatic chamber inner cylinder surface perimeter direction: the length of the corresponding leak detection end socket of length of each leak detection section,
Or the length of each leak detection section is less than the length of leak detection end socket, about leaks the length 2/3 of end socket, the case where for the latter,
It is hunted leak in the intersection of two leak detection sections using the method for superposition physical location.
The method that the step 1 vacuumizes specifically: be respectively connected to helium mass spectrometer leak detector and molecule pump assembly annular true
Annular vacuum and low temperature thermostatic chamber is accessed by hand-operated valve in empty cryogenic thermostat room, specially one end of helium mass spectrometer leak detector, and every is divided
Annular vacuum and low temperature thermostatic chamber is accessed by gate valve in one end of son pump, and the molecule pump assembly includes 2 molecular pumps and 2 machines
Tool pump.
It is described Step 2: step 3 include in detail below process it is as follows:
Select inner cylinder relative position in the weld seam of top as leak detection current layer；
Using leak detection end socket to current layer when the weld seam of leading portion sprays helium paragraph by paragraph；
If helium mass spectrometer leak detector detect current layer when leading portion weld seam leak rate it is below standard, leading portion is worked as to current layer
Weld seam is marked；
It is extracted using helium of the molecule pump assembly to thermostatic chamber, until current thermostatic chamber reaches initial true again
Empty background state；
It repeats-, the leak source of lower section of weld seam of current layer is detected and is marked, until all welderings of current layer
Section detection finishes；
Select inner cylinder relative position in following weld seam as leak detection current layer；
It repeats-；
The below standard weldering sections of all label leak rates of inner cylinder arc-shaped welding seam are welded or repair welding again.
The leak detection tool equipment further includes helium spray gun, and diameter is relatively small and small diameter workpiece for detecting for the leak detection spray gun
Between the leak source that compares on farther away workpiece weld seam of distance, comprising: method on support tube and ring vaccum cryogenic thermostat room
The weld seam of weld seam, the support tube intersection vertical with ring vaccum cryogenic thermostat room lower flange of blue vertical intersection, support
Weld seam, support tube and the ring vaccum cryogenic thermostat of cylinder intersection vertical with cylinder outside ring vaccum cryogenic thermostat room
The weld seam of outdoor cylinder tangent line intersection.
It is described Step 2: step 3 further include in detail below process it is as follows:
Select cyclotron thermostatic chamber top layer's workpiece as leak detection current layer；
Using leak detection spray gun to the weld seam sprinkling helium of some workpiece of thermostatic chamber current layer；
If helium mass spectrometer leak detector detects that the weld seam leak rate of some workpiece on current layer is below standard, to current layer
The weld seam of some workpiece be marked；
It is extracted using helium of the molecule pump assembly to thermostatic chamber, required by thermostatic chamber reaches again and is better than
Vacuum background state；
It repeats-, workpiece weld seam leak sources all on current layer are detected and are marked；
Select lower layer of workpiece of thermostatic chamber as current layer；
It repeats-, it is transferred to if detection finishes；
The below standard workpiece weld seam of all layers of all label leak rates is welded or repair welding again.
Advantages of the present invention effect
1, of the invention that traditional spray gun leading portion is increased into a rectangle leak detection end socket, in the leak detection end socket length direction one
Face opening is provided with jet cylinder towards weld seam, on the another side of the leak detection end socket opposite with being open, from jet cylinder spirt
Helium is sealed by rectangular region, to solve to use when welding gun sprinkling helium, helium descends slowly and lightly due to being not sealed with to sky
In gas, the helium to descend slowly and lightly into air is entered back at other leakages of weld seam, so that helium mass spectrometer detector cannot accurately be sentenced
Determine the problem of the real section of helium leakage.
2, major diameter weld seam is divided into multiple detector segments, then using the method for leak detection end socket segmentation detection by the present invention
The detection for carrying out section one by one is marked when detecting current session is helium leakage section, then utilizes molecule
Pump assembly vacuumize to vacuum and low temperature thermostatic chamber until restoring to be better than required vacuum background state, then again with same
Method detect next section, finished until by weld seam detections whole on major diameter circumference, repair welding finishes, until reaching standard
It is required that solve major diameter weld seam when finding that there is leakage in somewhere, it is necessary to the problem of whole welding or repair welding again.
3, the present invention overcomes traditional prejudice, domestic blank has been filled up.Traditional vacuum method detection is in complicated large size
When container, it is not easy to determine container specifically specific leak source position, the present invention, which uses, vacuumizes+hunt leak end socket+segmentation detection
Method, three mutually supports, interdependence, constitutes the new technical solution for solving major diameter weld seam and the Supreme People's Procuratorate's leak rate, fills up
Compared to the prior art domestic blank has substantive distinguishing features outstanding.
Detailed description of the invention
Fig. 1 is superconducting cyclotron vacuum chamber of the present invention welding position schematic diagram；
Fig. 2 is superconducting cyclotron vacuum chamber cavity semi-cutaway of the present invention；
Fig. 3 is the schematic diagram of superconducting cyclotron vacuum chamber leak hunting method of the present invention；
Fig. 4 is present invention detection end enclosure structure figure；
In figure, 0: superconducting cyclotron vacuum chamber；0-1: upper flange；0-2: lower flange；0-3: outer cylinder
Body；0-4: inner cylinder；1-1: support tube in suspension；1-2: support tube under suspension；1-3: suspension
Cross-brace cylinder；1-4: radial Beams detection target support tube；1-5: line extraction system support tube；1-6: electrostatic deflection plates are drawn
Electrode supporting cylinder；2: arc-shaped welding seam；3: molecular pump；3-1: gate valve；3-2: mechanical pump；4: helium mass spectrometer leak detector；4-1: manually
Valve；5: leak detection end socket；5-1: leak detection end socket opening；5-2: leak detection end socket jet cylinder.
Specific embodiment
Inventive principle
1, traditional pressurization, suction gun method for the present invention be not suitable for, the present invention due to require leak rate be no more than
1.0Xe-10mbarL/s generallys use vacuum method and hunts leak at this point, leak source is so small that be difficult to measure, if there is leak source goes out
It now needs to weld its part again or repair welding.
2, two kinds of welding line structures of superconducting cyclotron.As shown in Figure 1, superconducting cyclotron by toroidal vacuum chamber 0,
Support tube composition on toroidal vacuum chamber；The toroidal vacuum chamber include upper flange, lower flange, outer barrel, inner cylinder composition,
Support tube 1-1 in several suspension, the lower flange face in toroidal vacuum chamber are laid in the upper flange surface of toroidal vacuum chamber
On be laid with support tube 1-2 under several suspension, be laid with several suspension on the outer barrel of toroidal vacuum chamber
Cross-brace cylinder 1-3, meanwhile, also it is laid with electrostatic deflection plates extraction electrode support tube respectively on the outer barrel of toroidal vacuum chamber
1-6, line extraction system support tube 1-5, radial Beams detection target support tube 1-4, go back cloth on the inner cylinder of toroidal vacuum chamber
Equipped with the mild steel with cylinder unlike material, they are circumferentially distributed on inner cylinder, toroidal vacuum chamber diameter about 2
Rice.
According to above structure, the first welding line structure is the relatively small workpiece welding line structure of diameter, such as upper flange, laxative remedy
Each support tube blue, on outer barrel, their diameters are about 10 centimetres, and second of welding line structure is the relatively large workpiece of diameter
Welding line structure, the relatively large weld seam of diameter include the weld seam on inner cylinder circumference, and diameter is about 200 centimetres.
3, two kinds of leak detection tools of superconducting cyclotron.Different leak detection tools is used for two kinds of welding line structures.Needle
The workpiece relatively small to diameter is hunted leak using helium spray gun, helium is specially sprayed on the circumferential weld of support tube workpiece, such as
The detection of fruit helium mass analyzer is below standard, then welds entire support tube circumferential weld or repair welding again.At this point, even if helium is in sky
In descend slowly and lightly, should also be and descend slowly and lightly around current support tube, according to regional determination method, again by the entire weld seam of current support tube
Welding or repair welding.For the weld seam on the big workpiece of diameter such as inner cylinder, then welded paragraph by paragraph using leak detection end socket, and
Remove from and welding entire weld seam again or repair welding.As long as leak detection end socket and inner cylinder are manually physically connected to when detecting
On inner cylinder, do not need to fit together perfectly.It is negative pressure, the pressure of outside air because ring-like thermostatic type is evacuated state
Greater than the pressure inside thermostatic type.The one side slightly radian for detecting end socket opening, matches with inner cylinder curved surface.
Based on the above inventive principle, the present invention devises a kind of leak hunting method of cyclotron vacuum chamber.
A kind of leak hunting method for superconducting cyclotron vacuum chamber, comprising the following steps:
Step 1: being vacuumized using molecule pump assembly and helium mass spectrometer leak detector to ring vaccum cryogenic thermostat chamber interior；
As shown in Figure 1 and Figure 2, described vacuumize is that the ring-like inside cavity of ring vaccum cryogenic thermostat room is vacuumized,
The ring-like cavity includes upper flange 0-1, lower flange 0-2, outer barrel 0-3, inner cylinder 0-4.
Step 2: utilizing leak detection work when ring vaccum cryogenic thermostat chamber interior is better than required vacuum background state
It fills and helium is sprayed to the weld seam on thermostatic chamber, to examine thermostatic chamber with the presence or absence of leak source；
Step 3: if detecting thermostatic chamber weld seam, there are leak sources, and the current weld seam of thermostatic chamber is marked；
Step 4: repeating Step 2: step 3, until weld seam detections whole on thermostatic chamber are finished, and adds leak source
With label；
Finished Step 5: the position while welding for marking leak source is repaired one by one, repeat step 2 ~ 4, successively to thermostatic chamber into
Row leak detection reinspection, until the whole leak rate of thermostatic chamber reaches design requirement；
Its main feature is that:
The leak detection tool equipment includes rectangle leak detection end socket, and rectangle leak detection end socket is permanent for detecting ring vaccum low temperature
Leak rate above and below greenhouse major diameter circumference between weld seam on the closer weld seam of relative distance ratio.
Ring vaccum cryogenic thermostat room major diameter circumference is both the circumference in ring vaccum cryogenic thermostat room on cylinder,
About 2 meters of the diameter of the inner cylinder, circumferentially there is multiple tracks by mild steel and stainless steel welded arc on inner cylinder
Weld seam.
The closer weld seam of relative distance ratio is both between weld seam above and below the major diameter circumference of ring vaccum cryogenic thermostat room
Along the arc-shaped welding seam for the inner cylinder junction that the multiple arcs mild steel that inner cylinder circumferencial direction is laid is embedded in it.
As shown in figure 4, the leak detection end socket 5 are as follows: side opening 5-1 and be open in the longitudinal direction towards thermostatic chamber inner cylinder
Body, the approximate rectangle matched with thermostatic chamber inner cylinder curved surface, the approximation rectangle another side opposite with opening direction
A columned jet cylinder 5-2 that is vertical and running through the side is additionally provided on face, which is used for external helium
Feed channel, and helium is blowed to the one side of the opening of corresponding leak detection end socket from jet cylinder, and pass through leak detection end socket opening
One side 5-1 purge ring vaccum cryogenic thermostat room.
It is described that the weld seam on thermostatic chamber is sprayed using detecting tool, specially using leak detection end socket first to phase on inner cylinder
Weld seam to position in top detects, then detects to relative position on inner cylinder in following weld seam.
It is described that the weld seam on thermostatic chamber is sprayed using detecting tool, it is specially low along ring vaccum using leak detection end socket
It is detected paragraph by paragraph in warm thermostatic chamber inner cylinder surface perimeter direction: the length of the corresponding leak detection end socket of length of each leak detection section,
Perhaps the length of each leak detection section is less than the length or leak detection end socket length 2/3 of leak detection end socket, the case where for the latter,
It is hunted leak in the intersection of two leak detection sections using the method for superposition physical location.
As shown in figure 3, the method that the step 1 vacuumizes specifically: by helium mass spectrometer leak detector 4 and molecule pump assembly (3,
It 3-2) is respectively connected to ring vaccum cryogenic thermostat room, specially one end of helium mass spectrometer leak detector passes through hand-operated valve 4-1 access annular
Annular vacuum and low temperature thermostatic chamber, the molecule are accessed by gate valve 3-1 in one end of vacuum and low temperature thermostatic chamber, every molecular pump 3
Pump assembly includes 2 molecular pump 3 and 2 mechanical pump 3-2.
It is described Step 2: step 3 include in detail below process it is as follows:
Select the upper side length of inner cylinder 0-4 arc-shaped welding seam 2 as leak detection current layer；
Supplementary explanation: first, back gauge is closer up and down for the arc-shaped welding seam of inner cylinder, if do not allowed using helium spray gun
Easily distinguishing is leak source occurs in which road weld seam, so, helium spray gun cannot be used and leak detection end socket can only be used.Second, use inspection
Relative position will first be detected on inner cylinder in following weld seam, then detect opposite position on inner cylinder according to physical sequential by leaking end socket
It sets in following weld seam.Its principle is that helium up floats, when detecting the weld seam in lower side length in the ban, even if using end socket, still
The distance on upper and lower two sides is close, and helium is inevitably run out of from the side seam of end socket and floats upwards, and gets into the weld seam of side length
In.It is difficult to conclude the actual location of the leakage region of weld seam at this time.
Using leak detection end socket 5 to current layer when the weld seam of leading portion sprays helium paragraph by paragraph；
If helium mass spectrometer leak detector detect current layer when leading portion weld seam leak rate it is below standard, leading portion is worked as to current layer
Weld seam is marked；
The helium of thermostatic chamber is extracted using molecule pump assembly (3,3-2), until current thermostatic chamber reaches again
It is better than required vacuum background state；
It repeats-, the leak source of lower section of weld seam of current layer is detected and is marked, until all welderings of current layer
Section detection finishes；
Select the lower side length of inner cylinder arc-shaped welding seam as leak detection current layer；
It repeats-；
The below standard weldering sections of all label leak rates of inner cylinder arc-shaped welding seam are welded or repair welding again.
The leak detection tool equipment further includes helium spray gun, and diameter is relatively small and small diameter workpiece for detecting for the leak detection spray gun
Between the leak source that compares on farther away workpiece weld seam of distance, comprising: method on support tube and ring vaccum cryogenic thermostat room
The weld seam of weld seam, the support tube intersection vertical with ring vaccum cryogenic thermostat room lower flange of blue vertical intersection, support
Weld seam, support tube and the ring vaccum cryogenic thermostat of cylinder intersection vertical with cylinder outside ring vaccum cryogenic thermostat room
The weld seam of outdoor cylinder tangent line intersection.
It is described Step 2: step 3 further include in detail below process it is as follows:
Select cyclotron thermostatic chamber top layer workpiece 1-1 as leak detection current layer；
Supplementary explanation: it is detected from top to bottom when actually detected according to physical sequential, upper flange layer workpiece, outer barrel layer
Workpiece, lower flange layer workpiece.From top to bottom the reason of is that helium is lighter than air, is up floatd, when you using helium spray gun from most lower
When layer starts spray, helium may float from bottom to top around spray gun, when floating to upper one layer of workpiece, from upper one layer
Enter ring-like cavity in workpiece weld seam, is then difficult to judge that leakage occurs in the workpiece on current layer or upper layer at this time.If from
Top layer starts to detect, then can exclude this problem.For example, first layer detection is out of question, occur when if detecting next layer
The problem of problem, that must be just next layer, because even helium up floats, but does not find the problem in upper one layer of detection,
So problem appears in current layer rather than upper layer certainly.
Using leak detection spray gun to the weld seam sprinkling helium of some workpiece of thermostatic chamber current layer；
If helium mass spectrometer leak detector detects that the weld seam leak rate of some workpiece on current layer is below standard, to current layer
The weld seam of some workpiece be marked；
The helium of thermostatic chamber is extracted using molecule pump assembly (3,3-2), until thermostatic chamber reaches again and is better than
Required vacuum background state；
It repeats-, workpiece weld seam leak sources all on current layer are detected and are marked；
Select lower layer of workpiece of thermostatic chamber as current layer；
It repeats-, it is transferred to if detection finishes；
The below standard workpiece weld seam of all layers of all label leak rates is welded again.
It is emphasized that embodiment of the present invention be it is illustrative, without being restrictive, therefore packet of the present invention
It includes and is not limited to embodiment described in specific embodiment.
Claims (10)
1. a kind of leak hunting method for superconducting cyclotron vacuum chamber, comprising the following steps:
Step 1: being vacuumized using molecule pump assembly and helium mass spectrometer leak detector to ring vaccum cryogenic thermostat chamber interior；
Step 2: utilizing leak detection tool equipment pair when ring vaccum cryogenic thermostat chamber interior reaches required vacuum background state
Weld seam on thermostatic chamber sprays helium, to examine thermostatic chamber with the presence or absence of leak source；
Step 3: if detecting vacuum and low temperature thermostatic chamber weld seam, there are leak sources, and the current weld seam of thermostatic chamber is marked；
Step 4: repeating Step 2: step 3, until weld seam detections whole on thermostatic chamber are finished, and marks leak source
Note；
It is finished Step 5: the position while welding for marking leak source is repaired one by one, repeats step 2~tetra-, successively thermostatic chamber is carried out
Leak detection reinspection, until the whole leak rate of thermostatic chamber reaches design requirement；
It is characterized by:
The leak detection tool equipment includes rectangle leak detection end socket, and rectangle leak detection end socket is for detecting ring vaccum cryogenic thermostat room
Leak rate above and below major diameter circumference between weld seam on the closer weld seam of relative distance ratio.
2. a kind of leak hunting method for superconducting cyclotron vacuum chamber according to claim 1, it is characterised in that: described
Ring vaccum cryogenic thermostat room major diameter circumference is the circumference in ring vaccum cryogenic thermostat room on cylinder, the inner cylinder it is straight
About 2 meters of diameter, circumferentially there is multiple tracks by mild steel and stainless steel welded arc-shaped welding seam on inner cylinder.
3. a kind of leak hunting method for superconducting cyclotron vacuum chamber according to claim 1, it is characterised in that: described
The closer weld seam of relative distance ratio is along inner cylinder circle between weld seam above and below the major diameter circumference of ring vaccum cryogenic thermostat room
The arc-shaped welding seam for the inner cylinder junction that the multiple tracks arc mild steel that circumferential direction is laid is embedded in it.
4. a kind of leak hunting method for superconducting cyclotron vacuum chamber according to claim 1, it is characterised in that: described
Leak detection end socket are as follows: side is open and is open and matches towards thermostatic chamber inner cylinder, with thermostatic chamber inner cylinder curved surface in the longitudinal direction
The approximate cuboid of conjunction, be additionally provided on the approximation cuboid another side opposite with opening direction one it is vertical and run through
The columned jet cylinder of the side, the cylindric jet cylinder be used for external helium pipeline, and by helium from jet cylinder blow to
The one side of the opening of its corresponding leak detection end socket, and purged in ring vaccum cryogenic thermostat room by the one side of leak detection end socket opening
Weld seam on cylinder.
5. a kind of leak hunting method for superconducting cyclotron vacuum chamber according to claim 1, it is characterised in that: described
Helium is sprayed to the weld seam on thermostatic chamber using leak detection tool equipment, specially first relative position on inner cylinder is leaned on using leak detection end socket
The weld seam of top is detected, and relative position is detected by following weld seam on to inner cylinder.
6. a kind of leak hunting method for superconducting cyclotron vacuum chamber according to claim 1, it is characterised in that: described
Helium is sprayed to the weld seam on thermostatic chamber using leak detection tool equipment, specially using leak detection end socket along ring vaccum cryogenic thermostat room
It is detected paragraph by paragraph in inner cylinder surface perimeter direction: the length of the corresponding leak detection end socket of length of each leak detection section, or it is each
The length of section of hunting leak is less than the length of leak detection end socket, about hunts leak the 2/3 of end socket length, the case where for the latter, at two
The intersection of leak detection section is hunted leak using the method for superposition physical location.
7. a kind of leak hunting method for superconducting cyclotron vacuum chamber according to claim 1, it is characterised in that: described
The method that step 1 vacuumizes specifically: helium mass spectrometer leak detector and molecule pump assembly are respectively connected to ring vaccum cryogenic thermostat
Annular vacuum and low temperature thermostatic chamber, one end of every molecular pump are accessed by hand-operated valve in room, specially one end of helium mass spectrometer leak detector
Annular vacuum and low temperature thermostatic chamber is accessed by gate valve, the molecule pump assembly includes 2 molecular pumps and 2 mechanical pumps.
8. a kind of leak hunting method for superconducting cyclotron vacuum chamber according to claim 2, it is characterised in that: described
Step 2: step 3 includes process in detail below:
(1) select the relative position of inner cylinder arc-shaped welding seam in upper side length as leak detection current layer；
(2) helium is sprayed paragraph by paragraph using the weld seam that leak detection end socket works as leading portion to current layer；
If helium mass spectrometer leak detector detect current layer when leading portion weld seam leak rate it is below standard, to current layer when leading portion weld seam into
Line flag；
(4) extracted using helium of the molecule pump assembly to thermostatic chamber, until current thermostatic chamber reaches again required by being better than
Vacuum background state；
(5) repeat (2)-(3), the leak source of lower section of weld seam of current layer is detected and is marked, until all weldering sections of current layer detect
It finishes；
(6) select the lower side length of inner cylinder arc-shaped welding seam as leak detection current layer；
Repeat (2)-(5)；
(8) the below standard weldering sections of all label leak rates of inner cylinder rectangle weld seam are welded or repair welding again.
9. a kind of leak hunting method for superconducting cyclotron vacuum chamber according to claim 1, it is characterised in that: described
Leak detection tool equipment further includes helium spray gun, and the helium spray gun is for detecting that diameter is relatively small and distance is opposite between small diameter workpiece
Leak source on distant workpiece weld seam, comprising: support tube intersection vertical with ring vaccum cryogenic thermostat room upper flange
Weld seam, the weld seam of support tube intersection vertical with ring vaccum cryogenic thermostat room lower flange, support tube and the annular
Weld seam, support tube and the cylinder tangent line outside ring vaccum cryogenic thermostat room of the vertical intersection of vacuum and low temperature thermostatic chamber outer barrel
The weld seam of intersection.
10. a kind of leak hunting method for superconducting cyclotron vacuum chamber according to claim 1, it is characterised in that: institute
It states Step 2: step 3 includes process in detail below:
(1) select cyclotron thermostatic chamber top layer's workpiece as leak detection current layer；
(2) using leak detection helium spray gun to the weld seam sprinkling helium of some workpiece of thermostatic chamber current layer；
(3) if helium mass spectrometer leak detector detects that the weld seam leak rate of some workpiece on current layer is below standard, to some of current layer
The weld seam of workpiece is marked；
(4) extracted using helium of the molecule pump assembly to thermostatic chamber, until thermostatic chamber reaches again is better than required vacuum
Background state；
Repeat (2)-(4), workpiece weld seam leak sources all on current layer are detected and are marked；
(6) select lower layer of workpiece of thermostatic chamber as current layer；
Repeat (2)-(6), if detection finish if be transferred to (8)；
(8) the below standard workpiece weld seam of all layers of all label leak rates is welded or repair welding again.
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