CN116558731A - Air tightness detection device and method for GIS welding shell - Google Patents
Air tightness detection device and method for GIS welding shell Download PDFInfo
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- CN116558731A CN116558731A CN202310517160.2A CN202310517160A CN116558731A CN 116558731 A CN116558731 A CN 116558731A CN 202310517160 A CN202310517160 A CN 202310517160A CN 116558731 A CN116558731 A CN 116558731A
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- gis
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- air tightness
- welding
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- 238000001514 detection method Methods 0.000 title claims abstract description 83
- 238000003466 welding Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000001307 helium Substances 0.000 claims abstract description 34
- 229910052734 helium Inorganic materials 0.000 claims abstract description 34
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims abstract description 18
- 238000007689 inspection Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 21
- 238000005192 partition Methods 0.000 claims description 15
- 238000009423 ventilation Methods 0.000 claims description 11
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
Classifications
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to the technical field of GIS equipment detection, in particular to an air tightness detection device and method for a GIS welding shell, wherein the air tightness detection device comprises a helium mass spectrometer, an air inlet of the helium mass spectrometer is connected with a detection pipeline, and the detection pipeline is respectively connected with a leak detection suction gun, a complete machine constant container and a circular weld constant container; the detecting step includes (1) evacuating the inflation; (2) system coarse inspection; (3) precise inspection of the fixed container of the whole machine; and (4) carrying out precise inspection on the circular weld fixed container. According to the invention, helium is used as leakage gas, the whole gas tightness of the GIS welding shell is detected by using the whole machine constant volume device, the gas tightness of the local welding seam is detected by using the annular welding seam constant volume device, the position of the leakage point is determined, the test precision is high, the detection is rapid, the efficiency is high, and the local leakage rate and the accurate detection of the leakage point can be performed.
Description
Technical Field
The invention relates to the technical field of GIS equipment detection, in particular to an air tightness detection device and method for a GIS welding shell.
Background
Gas-insulated fully-enclosed combined electrical apparatus (Gas Insulated Switchgear, GIS) also called SF 6 The fully-closed combined electric appliance is characterized by that in the closed cylinder shell interior a SF with a certain pressure is filled 6 The protective gas is used for insulating and protecting the electronic components in the high-voltage power supply, and is high in operation reliability, less in maintenance workload and long in maintenance period.
In the application, because the GIS shells are all welded, leakage points are easy to occur at the welding seams, so that SF is caused 6 Leakage occurs, so that flashover fault is generated in the GIS, but SF occurs because the shell of the GIS is of a fully-closed structure 6 Positioning and overhauling of faults are difficult when leakage occurs, so that the power failure overhauling time is long after the leakage accident, and the loss is large.
Existing technologyIn the technology, the detection method of the whole air tightness of the GIS welding shell is mostly to use SF 6 As the leakage gas, a flexible material such as a plastic garment is used for the buckle cover GIS, a sand bag is used for fixing the seal cover, and SF is used 6 The detecting instrument detects the air tightness. The detection rate of the detection method is more than 10 -6 Pam 3 The level of/s, the accuracy is poor; the cover buckling time is at least more than 24 hours, the duration is long, the efficiency is low, meanwhile, the soft material is used for buckling the cover, the quantitative detection volume is not fixed, and the operation difficulty is high. In addition, detection of specific leakage points of the welding line is conventionally measured by using a suction gun method, and sweep type air tightness detection is performed by using a leakage detection suction gun. The method can detect the leakage point with larger scale, but is greatly influenced by the environment because the detection environment is not vacuum, and is easy to be detected by mistake and has small scale leakage point and trace SF 6 Leak detection and condition of gas leakage.
Disclosure of Invention
Aiming at the problems that in the prior art, the detection method for the integral air tightness of the GIS welding shell is poor in precision, low in efficiency and high in quantitative detection difficulty; the invention provides an air tightness detection device and method for a GIS welding shell, which are used for detecting the technical problems that a specific leakage point is greatly influenced by environment, easy to leak and false detection by using a suction gun method.
In a first aspect, the invention provides an air tightness detection device for a GIS welding shell, which comprises a helium mass spectrometer, wherein an air inlet of the helium mass spectrometer is connected with a detection pipeline, and the detection pipeline is respectively connected with a leak detection suction gun, a complete machine constant container and a circular weld constant container.
Further, the whole machine constant volume device comprises a constant volume device cylinder body with an opening at one end and a lifting platform, wherein the constant volume device cylinder body is made of stainless steel, and one end which is not opened is connected with the mechanical arm; the lifting platform comprises a lifting frame, the top end of the lifting frame is connected with a platform top plate, a sealing limit groove is arranged on the platform top plate, and the sealing limit groove can be tightly sealed with the opening of the constant volume container cylinder; the fixed container cylinder is respectively connected with the evacuation pump group and the detection pipeline.
Furthermore, the opening of the constant volume container body is provided with a buffer sealing layer, so that the sealing tightness of the constant volume container body after being sealed with the sealing limit groove is good.
Further, the circular weld joint fixed container comprises a left ring body and a right ring body which are connected through a flexible connecting pipe, the flexible connecting pipe can be bent to a certain extent and can not deform under negative pressure, and the left ring body and the right ring body can be opened and closed conveniently; the inner sides of the left ring body and the right ring body are respectively provided with an air vent groove, the air vent grooves are communicated with flexible connecting pipes, the flexible connecting pipes are respectively connected with an evacuating pump set and a detection pipeline, and the air in the air vent grooves can be pumped into the detection pipeline through the evacuating pump set.
Further, sealing layers are respectively arranged on the inner sides of the left ring body and the right ring body, and cover the groove edges of the ventilation grooves, so that good air tightness can be ensured when the annular welding seam constant volume device is attached to the GIS shell.
Further, a partition groove is arranged in the ventilation groove, a partition plate can be fixed on the partition groove, the inner space of the ventilation groove is partitioned into a measurable area communicated with the flexible connecting pipe and a closed area not communicated with the flexible connecting pipe, the annular welding seam fixed container after the partition plate is fixed only detects the air tightness of the shell covered by the measurable area, and the annular welding seam fixed container is rotated to detect the specific position of the leakage point for multiple times.
In a second aspect, the present invention provides a method for detecting the tightness of a GIS welding housing, using helium as a leakage gas, comprising the steps of:
(1) Evacuating and inflating, evacuating the air in the GIS welding shell, and inflating helium;
(2) Performing rough detection on the system, namely performing sweep-type rough detection on the outer surface of the GIS welding shell by using a leak detection suction gun;
(3) The complete machine fixed container is precisely inspected, the GIS welding shell is placed in the complete machine fixed container, the complete machine fixed container is closed, air tightness detection is carried out, the helium leak rate of the GIS welding shell is measured, and whether the air tightness is qualified or not is judged;
(4) Performing precise inspection on the annular welding seam fixed container, performing air tightness detection on a partial welding seam of the GIS welding shell with unqualified air tightness by using the annular welding seam fixed container, measuring the partial welding seam, and determining the position of a leakage point;
(5) And (5) returning air, and recovering helium in the GIS welding shell after the air tightness detection is finished.
Further, the specific operation of the step (3) is as follows: and (3) downwards fixing the opening of the constant volume container cylinder body above the lifting platform, placing the GIS welding shell on the lifting platform, lifting the lifting platform to be sealed with the opening of the constant volume container cylinder body by a sealing limit groove, starting an evacuating pump set to evacuate air in the space of the constant volume container cylinder body, and starting a helium mass spectrometer to perform air tightness detection.
Further, the specific operation of step (4) is as follows: and sleeving the annular welding seam fixed container on the outer surface of the GIS welding shell, enabling the welding seam of the position to be detected to be completely located in the coverage range of the vent groove, closing the annular welding seam fixed container, enabling the annular welding seam fixed container to be tightly attached to the GIS welding shell, starting the evacuation pump set to evacuate air in the inner space of the vent groove, and starting the helium mass spectrometer to perform air tightness detection.
Further, the method further comprises a partition fine inspection step, wherein after the step (4) is finished, a partition plate is fixed on a partition groove of the annular welding seam fixed container, the annular welding seam fixed container is sleeved on the outer surface of the GIS welding shell, the annular welding seam fixed container is rotated for multiple times to perform air tightness detection, and the position of a leakage point is determined.
The invention has the beneficial effects that:
1. according to the invention, helium is used as leakage gas, and a helium mass spectrometer detector is used for detecting whether helium escapes from the GIS welding shell, so that the purpose of detecting the tightness of the GIS welding shell is achieved, the helium is small molecular gas, the leakage is rapid, and the accuracy of a product tested by the helium mass spectrometer detector reaches 10 -8 Pam 3 And/s, the measurement accuracy is high, and the air tightness detection speed is high.
2. The invention utilizes the whole machine constant container to carry out the gas tightness detection of the whole GIS welding shell, the cylinder body of the whole machine constant container is made of stainless steel, the volume is fixed, and the quantitative detection of the gas tightness is easy to carry out.
3. The invention utilizes the circular weld constant volume device to detect the air tightness of the local weld, is easy to determine the position of the leakage point, has high detection precision, and can accurately detect the local leakage rate and the leakage point.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of a helium mass spectrometer and a complete set of vessels according to example 1 of the present invention.
Fig. 2 is a schematic diagram of the embodiment 2 of the present invention, in which the annular weld container is sleeved on the outer surface of the GIS welded shell in step (4).
FIG. 3 is a flowchart of the airtightness test according to embodiment 2 of the present invention.
In the figure, a 1-helium mass spectrometer, a 2-detection pipeline, a 3-buffer sealing layer, a 4-platform top plate, a 5-mechanical arm, a 6-constant volume container body, a 7-GIS welding shell, an 8-sealing limit groove, a 9-lifting frame, a 10-left ring body, a 11-flexible connecting pipe, a 12-right ring body and a 13-shell welding seam.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
The utility model provides a gas tightness detection device for GIS welding housing, includes helium mass spectrometer 1, and helium mass spectrometer 1's air inlet is connected with detection pipeline 2, and detection pipeline 2 is connected with leak hunting suction gun, complete machine constant container, girth weld constant volume ware respectively.
The whole machine constant volume device comprises a constant volume device cylinder 6 with an opening at one end and a lifting platform, wherein the constant volume device cylinder 6 is made of stainless steel, a buffer sealing layer 3 is arranged at the opening, and one end which is not opened is connected with a mechanical arm 5; the lifting platform comprises a lifting frame 9, the top end of the lifting frame 9 is connected with the platform top plate 4, the platform top plate 4 is provided with a sealing limit groove 8, and the sealing limit groove 8 can be tightly sealed with the opening of the constant volume container cylinder 6; the constant volume container cylinder 6 is respectively connected with the evacuation pump group and the detection pipeline 2.
The circular weld constant volume device comprises a left ring body 10 and a right ring body 12 which are connected through a flexible connecting pipe 11, wherein the inner sides of the left ring body 10 and the right ring body 12 are respectively provided with an air vent groove and a sealing layer, and the sealing layers cover the groove edges of the air vent grooves; the partition groove is arranged in the ventilation groove, a partition plate can be fixed on the partition groove, and the internal space of the ventilation groove is divided into a movable area communicated with the flexible connecting pipe and a closed area not communicated with the flexible connecting pipe; the flexible connecting pipe 11 is connected with the evacuation pump group and the detection pipeline 2 respectively.
Example 2
The gas tightness detection method for the GIS welding shell uses helium as leakage gas, the detection flow is shown in figure 3, and the steps comprise:
(1) Evacuating and inflating, evacuating the air in the GIS welding shell 7, and inflating helium;
(2) Performing rough detection on the system, namely performing sweep-type rough detection on the outer surface of the GIS welding shell 7 by using a leak detection suction gun;
(3) The complete machine constant volume container precision inspection, namely fixing the opening of a constant volume container cylinder 6 above a lifting platform by using a mechanical arm 5, placing a GIS welding shell 7 on the lifting platform, lifting the lifting platform until a sealing limit groove 8 is sealed with the opening of the constant volume container cylinder 6, starting an evacuating pump set to evacuate air in the space of the constant volume container cylinder 6, starting a helium mass spectrometer 1 to perform air tightness detection, measuring the helium leak rate of the GIS welding shell 7, and judging whether the air tightness is qualified;
(4) Precisely inspecting the ring-shaped welding seam fixed container, sleeving the ring-shaped welding seam fixed container on the outer surface of the GIS welding shell 7, enabling the shell welding seam 13 at the position to be inspected to be completely located in the coverage range of the ventilation groove, closing the ring-shaped welding seam fixed container, enabling the ring-shaped welding seam fixed container to be tightly attached to the GIS welding shell 7, starting an evacuating pump set to evacuate air in the inner space of the ventilation groove, and starting the helium mass spectrometer 1 to perform air tightness detection;
(5) The partition fine inspection is carried out, a partition plate is fixed on a partition groove of the annular welding seam fixed container, the annular welding seam fixed container is sleeved on the outer surface of the GIS welding shell 7, the GIS welding shell 7 is rotated for carrying out air tightness detection for many times, and the position of a leakage point is determined;
(6) And (5) returning air, and recovering helium in the GIS welding shell 7 after the air tightness detection is finished.
Although the present invention has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (10)
1. The gas tightness detection device for the GIS welding shell is characterized by comprising a helium mass spectrometer, wherein a gas inlet of the helium mass spectrometer is connected with a detection pipeline, and the detection pipeline is respectively connected with a leak detection suction gun, a complete machine constant container and a circular weld constant container.
2. The air tightness detection device according to claim 1, wherein the complete machine container comprises a container barrel with one open end and a lifting platform, the container barrel is made of stainless steel, and one end which is not open is connected with the mechanical arm; the lifting platform comprises a lifting frame, the top end of the lifting frame is connected with a platform top plate, a sealing limit groove is arranged on the platform top plate, and the sealing limit groove can be tightly sealed with the opening of the constant volume container cylinder; the fixed container cylinder is respectively connected with the evacuation pump group and the detection pipeline.
3. The air tightness detection device according to claim 2, wherein a buffer sealing layer is arranged at the opening of the constant volume container body.
4. The air tightness detection device according to claim 1, wherein the circular welding seam container comprises a left ring body and a right ring body which are connected through flexible connecting pipes, ventilation grooves are respectively arranged on the inner sides of the left ring body and the right ring body, the ventilation grooves are communicated with the flexible connecting pipes, and the flexible connecting pipes are respectively connected with the evacuation pump group and the detection pipeline.
5. The air tightness detection device according to claim 4, wherein sealing layers are respectively provided on the inner sides of the left ring body and the right ring body, and the sealing layers cover the groove edges of the ventilation groove.
6. The air tightness detection device according to claim 4, wherein the ventilation groove is provided with partition grooves.
7. A method for airtightness detection of a GIS welding housing using the airtightness detection apparatus according to any one of claims 1 to 6, wherein helium is used as an indicating gas, the steps comprising:
(1) Evacuating and inflating, evacuating the air in the GIS welding shell, and inflating helium;
(2) Performing rough detection on the system, namely performing sweep-type rough detection on the outer surface of the GIS welding shell by using a leak detection suction gun;
(3) The complete machine fixed container is precisely inspected, the GIS welding shell is placed in the complete machine fixed container, the complete machine fixed container is closed, air tightness detection is carried out, the helium leak rate of the GIS welding shell is measured, and whether the air tightness is qualified or not is judged;
(4) Performing precise detection on the annular welding seam fixed container, performing air tightness detection on a shell welding seam of the GIS welding shell with unqualified air tightness by using the annular welding seam fixed container, and determining the position of a leakage point;
(5) And (5) returning air, and recovering helium in the GIS welding shell after the air tightness detection is finished.
8. The method of claim 7, wherein the specific operation of step (3) is: and (3) downwards fixing the opening of the constant volume container cylinder body above the lifting platform, placing the GIS welding shell on the lifting platform, lifting the lifting platform to be sealed with the opening of the constant volume container cylinder body by a sealing limit groove, starting an evacuating pump set to evacuate air in the space of the constant volume container cylinder body, and starting a helium mass spectrometer to perform air tightness detection.
9. The method of claim 7, wherein the specific operation of step (4) is: and sleeving the annular welding seam fixed container on the outer surface of the GIS welding shell, enabling the welding seam of the position to be detected to be completely located in the coverage range of the vent groove, closing the annular welding seam fixed container, enabling the annular welding seam fixed container to be tightly attached to the GIS welding shell, starting the evacuation pump set to evacuate air in the inner space of the vent groove, and starting the helium mass spectrometer to perform air tightness detection.
10. The method of claim 7, further comprising a zonal fine inspection step, wherein after the step (4) is finished, a partition plate is fixed on a zonal groove of the girth weld container, the girth weld container is sleeved on the outer surface of the GIS welding shell, the girth weld container is rotated for a plurality of times to perform air tightness detection, and the position of the leakage point is determined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310517160.2A CN116558731A (en) | 2023-05-09 | 2023-05-09 | Air tightness detection device and method for GIS welding shell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310517160.2A CN116558731A (en) | 2023-05-09 | 2023-05-09 | Air tightness detection device and method for GIS welding shell |
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| CN116558731A true CN116558731A (en) | 2023-08-08 |
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| CN202310517160.2A Pending CN116558731A (en) | 2023-05-09 | 2023-05-09 | Air tightness detection device and method for GIS welding shell |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147067A (en) * | 2023-10-12 | 2023-12-01 | 国网湖北省电力有限公司超高压公司 | Electric equipment hidden danger detection method and system based on SF6 gas analysis |
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2023
- 2023-05-09 CN CN202310517160.2A patent/CN116558731A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117147067A (en) * | 2023-10-12 | 2023-12-01 | 国网湖北省电力有限公司超高压公司 | Electric equipment hidden danger detection method and system based on SF6 gas analysis |
| CN117147067B (en) * | 2023-10-12 | 2024-05-28 | 国网湖北省电力有限公司超高压公司 | Electric equipment hidden danger detection method and system based on SF6 gas analysis |
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