CN112710438B - Detachable connector device for hot helium leak detection test and leak detection method thereof - Google Patents
Detachable connector device for hot helium leak detection test and leak detection method thereof Download PDFInfo
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- CN112710438B CN112710438B CN202011620233.3A CN202011620233A CN112710438B CN 112710438 B CN112710438 B CN 112710438B CN 202011620233 A CN202011620233 A CN 202011620233A CN 112710438 B CN112710438 B CN 112710438B
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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
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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
- G01M3/222—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 tubes
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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
- G01M3/223—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 pipe joints or seals
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention belongs to the technical field of hot helium leak detection, and particularly relates to a detachable joint device for a hot helium leak detection test and a leak detection method thereof, wherein the method comprises the following steps: the device comprises a high-temperature high-pressure helium channel, an evacuation pipeline, a screw A, a screw B, a stop block, a cover plate, a positioning ring, a metal sealing ring A and a metal sealing ring B; the invention takes a double-metal sealing ring structure as an example, and realizes the detachable quick-plug connector by improving the modes of vacuumizing the interlayer and pressing the sealing ring, so that the mode ensures lower hot helium leakage rate, can be effectively used in a wide temperature and pressure range, can efficiently realize the replacement of a test part, and improves the efficiency of hot helium leakage detection.
Description
Technical Field
The invention belongs to the technical field of hot helium leak detection, and particularly relates to a detachable joint device for a hot helium leak detection test and a leak detection method thereof.
Background
The hot helium leak detection measurement is used for detecting leak points which cannot be detected by common helium leak detection by improving the temperature and the pressure of helium in a detection part on the basis of internal pressure helium leak detection, is a detection means with higher requirements on vacuum parts, and is applied to part of parts of an international thermonuclear fusion experimental reactor.
Because a sufficiently low leakage rate is ensured under high-temperature and high-pressure helium, the connection between a helium passage and a test part needs to keep high reliability and low helium leakage rate, the currently used joint device for the hot helium leakage test adopts a welding connection method, so that interface welding deformation is easily caused, subsequent processing and size detection are required after detection is finished, and the process flow is increased.
Consequently need design a can dismantle piecing devices for hot helium leak hunting test to avoid traditional welded joint to connect and need follow-up processing and the yielding problem of crater, and then shorten the part and change and connect the time, be convenient for effectively promote hot helium leak hunting efficiency.
Disclosure of Invention
The invention aims to provide a detachable joint device for a hot helium leak detection test and a leak detection method thereof aiming at the defects in the prior art, and the detachable joint device is used for solving the technical problems that the traditional welding joint needs to be welded and connected in the hot helium leak detection test, the subsequent welded junction is easy to deform, parts are replaced, and the connection time is too long.
The technical scheme of the invention is as follows:
a detachable adapter device for a hot helium leak test comprising: the device comprises a high-temperature high-pressure helium channel, an evacuation pipeline, a screw A, a screw B, a stop block, a cover plate, a positioning ring, a metal sealing ring A and a metal sealing ring B;
an evacuation pipeline is sleeved outside the high-temperature high-pressure helium channel in a surrounding manner; a check block is sleeved on one end of the outer wall of the evacuation pipeline in a ring manner; the same ends of the evacuation pipeline and the high-temperature high-pressure helium channel are welded on one side of the cover plate; the check block is provided with a screw A and a screw B, the check block is fixed on the detection part by the screw A, and the screw B is in threaded connection with the check block; a positioning ring is arranged on the other side of the cover plate;
the improved vacuum pump is characterized in that an annular sealing groove A and an annular sealing groove B are further formed in the surface of the cover plate respectively, a metal sealing ring A is arranged in the annular sealing groove A, a metal sealing ring B is arranged in the annular sealing groove B, and an air hole communicated with an evacuation pipeline is formed between the annular sealing groove A and the annular sealing groove B.
The whole T type structure that is of apron, the apron includes: the novel anti-theft device comprises a disc and a boss, wherein a cylindrical boss is arranged on the surface of the disc, and an external thread is arranged on the outer wall of the boss.
The positioning ring is of a hollow cylinder structure, and the positioning ring and the boss are connected and fixed on the cover plate through threads.
The whole block is of an annular cylindrical structure, and the circumferential surface of the block is provided with a plurality of threaded through holes A and a plurality of threaded through holes B; the screw B penetrates through the threaded through hole B to be in threaded connection with the stop block, the bottom of the screw B is in contact with the surface of the disc of the cover plate, and the stop block is tightly pressed on the cover plate by screwing the screw B.
The screw A penetrates through the threaded through hole A in the stop block to be connected with the part to be detected, and the screw A is screwed down to compress the stop block.
And the metal seal ring A and the metal seal ring B are coated with soft metal coatings, and the thickness of the soft metal layers is not less than 20 micrometers.
A method of leak testing a demountable joint arrangement for use in a hot helium leak test, as described above, comprising the steps of:
the method comprises the following steps: cleaning and drying all parts in the device, and ensuring that no solid debris or scratches exist in the annular sealing groove A and the annular sealing groove B; one end of the high-temperature high-pressure helium passage is connected with a helium source, and the other end of the high-temperature high-pressure helium passage is welded on the component; one end of the evacuation pipeline is connected with the vacuum system, the other end of the evacuation pipeline is also welded on the component, helium leakage detection is carried out on the pipeline and the welding line before use, the welding quality is ensured, and the problems of helium leakage and the like caused by pipeline defects are solved;
step two: after the metal sealing ring A and the metal sealing ring B are arranged on the cover plate, the positioning ring is screwed on the cover plate, the cover plate with the positioning ring is inserted into the joint of the workpiece to be detected, and the metal sealing ring A and the metal sealing ring B on the cover plate are contacted with the sealing surface of the workpiece;
step three: a threaded hole is drilled in a proper position on a workpiece to be detected in advance, the threaded hole is matched with the screw A, the screw A penetrates through the stop block and is screwed into the threaded hole, the stop block is fixed on the workpiece to be detected, and the integral pre-tightening force provided by the screw A is 10% -20% higher than the pre-tightening force required by compression of the metal sealing ring A and the metal sealing ring B;
step four: pressing the cover plate onto a workpiece to be tested by screwing the screw B until the compression amount of the metal sealing ring A and the metal sealing ring B reaches 15-20%;
step five: placing the parts connected with the detachable joint device into a vacuum chamber, vacuumizing the vacuum chamber, heating to a temperature required by testing, and externally connecting the vacuum chamber with a helium mass spectrometer leak detector A;
step six: vacuumizing a sealing interlayer formed by the metal sealing ring A and the metal sealing ring B9 and the workpiece to be detected by a vacuum system connected with a vacuumizing pipeline until the vacuum degree is better than 1x10 < -2 > Pa;
step seven: helium is introduced into the workpiece to be detected through a high-temperature high-pressure helium channel, and helium leakage detection is performed through a helium mass spectrometer leak detector A connected with the vacuum chamber after specified temperature and pressure circulation.
The invention has the beneficial effects that:
the invention takes a double-metal sealing ring structure as an example, and realizes the detachable quick-plug connector by improving the modes of vacuumizing the interlayer and compressing the sealing ring, and the mode ensures lower hot helium leakage rate, can be effectively used in a wide temperature and pressure range, can efficiently realize the replacement of a test part and improves the efficiency of hot helium leakage detection. The method also has the following technical effects in the hot helium leak detection test:
(1) 4MPa helium is introduced into the test workpiece, and hot helium leak detection is performed at room temperature, 250 ℃ and 500 ℃, so that the performance of the test workpiece can be kept better than 10 -12 Pa.m 3 A leak rate of/s;
(2) Helium leak detection is carried out after the temperature is reduced to normal temperature from high temperature, and the joint can be kept better than 10 -12 Pa.m 3 The leakage rate per second has better adaptability to temperature cycle;
(3) The pressure is increased to 4MPa under the normal pressure at the temperature of 250 ℃, the pressure is reduced to the normal pressure after helium leakage detection is finished, the pressure is increased to 4MPa for detection, and the helium leakage rate of the joint can still be kept to be better than 10 after 5 cycles of repetition -12 Pa.m 3 S, has good adaptability to pressure circulation;
(4) The welding connection is not needed, the test process is convenient to install and detach, the detection efficiency is improved, and the interface of the test component is not deformed or damaged.
Drawings
FIG. 1 is a schematic structural diagram of a detachable joint device for a hot helium leak test according to the present invention;
FIG. 2 is a schematic view of the cover plate structure of the present invention
FIG. 3 is a schematic diagram of an assembly of a detachable joint device for a hot helium leak test and a workpiece to be tested according to the present invention
Wherein: 1-a high-temperature high-pressure helium channel, 2-an evacuation pipeline, 3-a screw A, 4-a screw B, 5-a stop block, 6-a cover plate, 7-a positioning ring, 8-a metal sealing ring A and 9-a metal sealing ring B; 10-boss, 11-disc, 12-workpiece to be detected, 13-vacuum chamber
Detailed Description
The detachable joint device for the hot helium leak test of the present invention will be described in detail with reference to the accompanying drawings and examples.
A detachable adapter device for a hot helium leak test comprising: the device comprises a high-temperature high-pressure helium gas channel 1, an evacuation pipeline 2, a screw A3, a screw B4, a stop block 5, a cover plate 6, a positioning ring 7, a metal sealing ring A8 and a metal sealing ring B9;
an evacuation pipeline 2 is sleeved outside the high-temperature high-pressure helium passage 1; a stop block 5 is sleeved on one end of the outer wall of the evacuation pipeline 2; the same ends of the evacuation pipeline 2 and the high-temperature high-pressure helium channel 1 are welded on one side of the cover plate 6; the stop block 5 is provided with a screw A3 and a screw B4, the stop block 5 is fixed on the detection part by the screw A3, and the screw B4 is in threaded connection with the stop block 5; a positioning ring 7 is arranged on the other side of the cover plate 6;
the surface of the cover plate 6 is also provided with an annular sealing groove A and an annular sealing groove B respectively, a metal sealing ring A8 is arranged in the annular sealing groove A, a metal sealing ring B9 is arranged in the annular sealing groove B, and an air hole communicated evacuation pipeline 2 is arranged between the annular sealing groove A and the annular sealing groove B.
The cover plate 6 is integrally of a T-shaped structure, and the cover plate 6 comprises: disc 11 and boss 10, be provided with cylinder type boss 10 on the surface of disc 11, be provided with the external screw thread on the outer wall of boss 10.
The positioning ring 7 is of a hollow cylindrical structure, and the positioning ring 7 is fixed on the cover plate 6 in a threaded connection with the boss 10.
The whole block 5 is of an annular cylindrical structure, and the circumferential surface of the block 5 is provided with a plurality of threaded through holes A and a plurality of threaded through holes B; the screw B4 penetrates into the threaded through hole B to be in threaded connection with the stop block 5, the bottom of the screw B4 is in contact with the surface of the disc 11 of the cover plate 6, and the stop block 5 compresses the cover plate 6 by screwing the screw B4.
The screw A3 penetrates through a threaded through hole A in the stop block 5 to be connected with the part to be detected, and the screw A3 is screwed down to press the stop block 5.
And the metal sealing ring A8 and the metal sealing ring B9 are both coated with soft metal coatings, and the thickness of the soft metal coatings is not less than 20 micrometers.
A leak detection method for a detachable joint apparatus for a hot helium leak test as described above, comprising the steps of:
the method comprises the following steps: cleaning and drying all parts in the device, and ensuring that no solid debris or scratches exist in the annular sealing groove A and the annular sealing groove B; one end of the high-temperature high-pressure helium gas channel 1 is connected with a helium source, and the other end of the high-temperature high-pressure helium gas channel 1 is welded on the component 6; one end of the evacuation pipeline 2 is connected with a vacuum system, the other end of the evacuation pipeline 2 is also welded on the component 6, helium leakage detection is carried out on a pipeline and a welding line before use, welding quality is guaranteed, and the problems of helium leakage and the like caused by pipeline defects are solved;
step two: after the metal sealing ring A8 and the metal sealing ring B9 are arranged on the cover plate 6, the positioning ring 7 is screwed on the cover plate 6, the cover plate 6 with the positioning ring 7 is inserted into the interface of a workpiece 12 to be detected, and the metal sealing ring A8 and the metal sealing ring B9 on the cover plate 6 are contacted with the sealing surface of the workpiece;
step three: a threaded hole is drilled in a proper position on a workpiece 12 to be detected in advance, the threaded hole is matched with the screw A3, the screw A3 penetrates through the stop block 5 and is screwed into the threaded hole, the stop block 5 is fixed on the workpiece 12 to be detected, and the integral pre-tightening force provided by the screw A3 is 10% -20% higher than the pre-tightening force required by compression of the metal sealing ring A8 and the metal sealing ring B9;
step four: the cover plate 6 is pressed on a workpiece to be tested by screwing the screw B4 until the compression amount of the metal seal ring A8 and the metal seal ring B9 reaches 15-20%;
step five: putting the parts connected with the detachable joint device into a vacuum chamber 13, vacuumizing the vacuum chamber, heating to a temperature required by testing, and externally connecting a helium mass spectrometer leak detector A to the vacuum chamber;
step six: vacuumizing a sealing interlayer formed by the metal sealing ring A8, the metal sealing ring B9 and the workpiece to be detected by a vacuum system connected with the evacuation pipeline 2 until the vacuum degree is better than 1x10 < -2 > Pa;
step seven: introducing helium into the workpiece to be detected through the high-temperature high-pressure helium channel 1, and performing helium leakage detection through a helium mass spectrometer leak detector A connected with the vacuum chamber after specified temperature and pressure circulation.
Example (b):
the invention ensures the lower hot helium leakage rate of the joint form through reasonable selection of the sealing ring, design of the evacuation channel and optimization of the compression mode, can be effectively used in a very wide temperature and pressure range, can avoid the problems of subsequent processing and deformation required by the traditional welding connection, greatly shortens the time of part replacement and connection, and can effectively improve the hot helium leakage detection efficiency.
The metal sealing ring A8 and the metal sealing ring B9 are made of Alloy 718, and the material can still keep higher strength and restoring force at high temperature, so that the helium leakage rate can be prevented from being increased due to temperature circulation;
the thickness of the soft metal coating of the metal sealing ring A8 and the metal sealing ring B9 is not less than 20 microns, and the sufficient thickness can ensure the sufficient sealing of the contact surface to prevent helium from permeating;
the metal ring groove and the sealing surface of the test component adopt a turning mode, and the roughness is better than 0.8 mu m; the turning mode does not generate penetrating grains and simultaneously reduces the roughness, which is beneficial to the sealing effect of the metal sealing ring;
a smooth channel and an unlimited space are ensured between the two layers of metal rings, and the channel is connected with a vacuum system; during installation, the metal ring is ensured to be compressed by 15-20%, and the integral pre-tightening force between the detachable connector and the test component is higher than 10-20% of the pre-tightening force of the metal ring; the sufficient compression amount and the pretightening force can ensure that the helium leakage rate of the metal sealing ring is not increased due to temperature and pressure circulation;
after the double metal rings are compressed in place, a vacuum system is started to vacuumize a channel between the two metal rings, so that the vacuum degree is better than 1x10 -2 Pa; helium permeation to the first heavy metal ring reaches doublyAfter the metal ring middle channel is pumped away along with a vacuum system, the helium pressure of the front stage of the second metal ring can be kept at a very low level, and the overall helium leakage rate at the joint can be kept at a very low level without influencing the component leakage rate.
While the embodiments of the present invention have been described in detail, the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. The utility model provides a can dismantle piecing devices for hot helium leak hunting test which characterized in that: the device comprises a high-temperature high-pressure helium channel (1), an evacuation pipeline (2), a screw A (3), a screw B (4), a stop block (5), a cover plate (6), a positioning ring (7), a metal sealing ring A (8) and a metal sealing ring B (9);
an evacuation pipeline (2) is sleeved outside the high-temperature high-pressure helium channel (1); a stop block (5) is sleeved on one end of the outer wall of the evacuation pipeline (2) in a ring manner; the same ends of the evacuation pipeline (2) and the high-temperature high-pressure helium channel (1) are welded on one side of the cover plate (6); the stop block (5) is provided with a screw A (3) and a screw B (4), the stop block (5) is fixed on a workpiece to be detected by the screw A (3), and the screw B (4) is in threaded connection with the stop block (5); a positioning ring (7) is arranged on the other side of the cover plate (6);
the utility model discloses a pipeline evacuation device, including apron (6), metal sealing ring A (8), metal sealing ring B (9), it has the gas pocket intercommunication to manage to find time pipeline (2) to open between annular sealing groove A and the annular sealing groove B, the apron still is provided with annular sealing groove A and annular sealing groove B on the surface respectively, be provided with metal sealing ring A (8) in the annular sealing groove A, be provided with metal sealing ring B (9) in the annular sealing groove B, it has gas pocket intercommunication to manage to find time pipeline (2) to open between annular sealing groove A and the annular sealing groove B.
2. A detachable adapter device for hot helium leak test as claimed in claim 1, wherein: the cover plate (6) is integrally of a T-shaped structure, and the cover plate (6) comprises: the novel anti-theft device comprises a disc (11) and a boss (10), wherein a cylindrical boss (10) is arranged on the surface of the disc (11), and an external thread is arranged on the outer wall of the boss (10).
3. A detachable adapter device for hot helium leak test as claimed in claim 2, wherein: the positioning ring (7) is of a hollow cylindrical structure, and the positioning ring (7) is fixed on the cover plate (6) in threaded connection with the boss (10).
4. A detachable connector device for use in a hot helium leak test as claimed in claim 3, wherein: the whole block (5) is of an annular cylindrical structure, and the circumferential surface of the block (5) is provided with a plurality of threaded through holes A and a plurality of threaded through holes B; screw B (4) penetrate through screw thread through-hole B and dog (5) threaded connection, the bottom of screw B (4) contacts with the surface of disc (11) of apron (6), realizes that dog (5) compress tightly apron (6) through screwing up screw B (4).
5. A detachable connector device for a hot helium leak test as claimed in claim 4, wherein: the screw A (3) penetrates through a threaded through hole A in the stop block (5) to be connected with a workpiece to be detected, and the screw A (3) is screwed down to compress the stop block (5).
6. A detachable connector device for a hot helium leak test as claimed in claim 5, wherein: and soft metal coatings are respectively coated on the metal sealing ring A (8) and the metal sealing ring B (9), and the thickness of each soft metal coating is not less than 20 micrometers.
7. A method of leak detection of a detachable joint assembly for hot helium leak test according to any one of claims 1 to 6, characterized by comprising the steps of:
the method comprises the following steps: cleaning and drying all parts in the device, and ensuring that no solid debris or scratches exist in the annular sealing groove A and the annular sealing groove B; one end of the high-temperature high-pressure helium channel (1) is connected with a helium source, and the other end of the high-temperature high-pressure helium channel (1) is welded on the cover plate (6); one end of the evacuation pipeline (2) is connected with a vacuum system, the other end of the evacuation pipeline (2) is also welded on the cover plate (6), helium leakage detection is carried out on a pipeline and a welding line before use, welding quality is guaranteed, and the problems of helium leakage and the like caused by pipeline defects are solved;
step two: after the metal sealing ring A (8) and the metal sealing ring B (9) are arranged on the cover plate (6), the positioning ring (7) is screwed on the cover plate (6) in a threaded manner, the cover plate (6) with the positioning ring (7) is inserted into an interface of a workpiece (12) to be detected, and the metal sealing ring A (8) and the metal sealing ring B (9) on the cover plate (6) are contacted with a workpiece sealing surface;
step three: a threaded hole is drilled in a proper position on a workpiece (12) to be detected in advance, the threaded hole is matched with the screw A (3), the screw A (3) penetrates through the stop block (5) and is screwed into the threaded hole, the stop block (5) is fixed on the workpiece (12) to be detected, and the integral pre-tightening force provided by the screw A (3) is 10% -20% higher than the pre-tightening force required by compression of the metal sealing ring A (8) and the metal sealing ring B (9);
step four: pressing the cover plate (6) onto a workpiece to be detected by screwing the screw B (4) until the compression amount of the metal sealing ring A (8) and the metal sealing ring B (9) reaches 15-20%;
step five: putting the parts connected with the detachable joint device into a vacuum chamber (13), vacuumizing the vacuum chamber and heating to a temperature required by testing, wherein the vacuum chamber is externally connected with a helium mass spectrometer leak detector A;
step six: vacuumizing a sealing interlayer formed by the metal sealing ring A (8), the metal sealing ring B (9) and the workpiece to be detected by a vacuum system connected with the evacuation pipeline (2) until the vacuum degree is better than 1x10 -2 Pa；
Step seven: introducing helium into the workpiece to be detected through the high-temperature high-pressure helium channel (1), and performing helium leakage detection through a helium mass spectrometer leak detector A connected with the vacuum chamber after specified temperature and pressure circulation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011620233.3A CN112710438B (en) | 2020-12-31 | 2020-12-31 | Detachable connector device for hot helium leak detection test and leak detection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011620233.3A CN112710438B (en) | 2020-12-31 | 2020-12-31 | Detachable connector device for hot helium leak detection test and leak detection method thereof |
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| CN112710438A CN112710438A (en) | 2021-04-27 |
| CN112710438B true CN112710438B (en) | 2022-12-20 |
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| CN113567062B (en) * | 2021-07-21 | 2023-10-20 | 无锡先导智能装备股份有限公司 | Helium detector |
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