CN113049192A

CN113049192A - Leak detection structure, leak detection device and leak detection method

Info

Publication number: CN113049192A
Application number: CN202110226145.3A
Authority: CN
Inventors: 刘海峰; 何高魁; 梁爽
Original assignee: China Institute of Atomic of Energy
Current assignee: China Institute of Atomic of Energy
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2021-06-29

Abstract

The application discloses leak hunting structure for the leakproofness of inspection armoured cable assembly's welding seam, including mounting and sealing member. The mounting forms the cavity of open end and the leak hunting mouth that communicates with the cavity, the leak hunting mouth is used for being connected with the leak detector, the cavity is used for holding the one end of armoured cable subassembly, establish the sealing member through the pot head at armoured cable subassembly, increase the leakproofness of armoured cable subassembly and mounting, the leak detector can more accurately inspect the leakproofness of the welding seam of the armoured cable subassembly that is located the outside of sealing member, thereby discern the poor armoured cable subassembly of leakproofness, have the advantage that improves the leakproofness of ionization chamber armoured cable subassembly. The application still provides a leak hunting device simultaneously for the leakproofness of inspection armoured cable assembly's welding seam. The application also provides a leak detection method, which is applied to the leak detection device provided by the embodiment of the application, is used for detecting the sealing property of the welding line of the armored cable assembly and has the advantage of improving the sealing property of the armored cable assembly.

Description

Leak detection structure, leak detection device and leak detection method

Technical Field

The application relates to the technical field of in-reactor detectors of reactors, in particular to a leakage detecting structure, a leakage detecting device and a leakage detecting method, which are used for detecting the sealing property of a welding seam of an armored cable assembly.

Background

The high-temperature fission ionization chamber is a sealed inflation detector, the maximum working temperature is about 550 ℃, the high-temperature fission ionization chamber belongs to important safety equipment of a nuclear power station, and the high-temperature fission ionization chamber is commonly used for monitoring the neutron fluence rate in an outer pore channel of a reactor and the change rate of the neutron fluence rate, providing real-time effective monitoring data for a reactor protection system, further judging to obtain the power level and the running state of the reactor, and ensuring the normal running of the reactor. The armored cable works in a high-temperature state and is used for transmitting signals of the two ceramic insulated electrodes of the probe, the armored cable is welded and fixed with the connecting piece, and the armored cable welded with the connecting piece is welded with the insulated electrodes.

The sealing performance of the armored cable directly affects the resistance of the insulation resistance of the armored cable. The leakage rate is an important index representing the performance of sealing performance, and the performance of the leakage rate directly influences the service life of the high-temperature fission ionization chamber. In the high-temperature fission ionization chamber in the prior art, the problem of low tightness of welding seams of armored cable components exists.

Disclosure of Invention

In view of this, embodiments of the present application are expected to provide a leak detection structure, a leak detection apparatus, and a leak detection method, so as to inspect the tightness of a weld of an armored cable assembly, thereby solving the problem that the armored cable assembly has low tightness.

To achieve the above object, an aspect of embodiments of the present application provides a leak detection structure for checking sealability of a weld of an armored cable assembly, including:

the fixing piece is provided with a cavity with an opening end and a leakage detecting port communicated with the cavity, the opening end is used for penetrating one end of the armored cable assembly into the cavity, and the leakage detecting port is used for being connected with a leakage detector; and

the sealing element is configured to be sleeved at one end of the armored cable assembly, the sealing element is located in the cavity or lapped at the opening end, so that the armored cable assembly is in sealing connection with the fixing element, and the welding seam is located on one side, close to the opening end, of the sealing element.

Further, the armored cable assembly includes an armored cable and a connector, the armored cable being welded with the connector to form the weld, the fixture including:

the mounting table is provided with the cavity with the opening end and the leakage detection port, the cavity comprises a first cavity and a second cavity which form a first step surface and are communicated with each other, the opening end is formed at one end of the first cavity far away from the second cavity, and the first step surface faces the opening end; the opening end is used for penetrating one end of the connecting piece into the cavity, the sealing piece is sleeved on the connecting piece, and the sealing piece is positioned in the first cavity; and

the cover plate is provided with a through hole and covered on the installation platform to extrude the sealing element to enable the connecting piece to be in sealing connection with the installation platform, and one end, far away from the connecting piece, of the armored cable penetrates through the through hole.

Further, a flange is formed at one end of the connecting piece, the outer diameter of the flange is larger than the inner diameter of the through hole, one end, far away from the flange, of the connecting piece is arranged in the cavity in a penetrating mode, and the welding seam is located at one end, close to the flange, of the connecting piece;

the outer diameter of the flange is smaller than the inner diameter of the first cavity, and when the cover plate is covered on the mounting table, the flange is located in the first cavity to extrude the sealing element; or the like, or, alternatively,

the outer diameter of the flange is larger than the inner diameter of the first cavity, a limiting cavity matched with the flange is formed in the cover plate, the height of the sealing element is larger than that of the first cavity, and when the cover plate is covered on the mounting table, the flange is located outside the first cavity to extrude the sealing element.

Furthermore, the cover plate is provided with a notch communicated with the via hole, and the notch penetrates through the edge of the cover plate.

Further, the leak detection structure further comprises a bolt, the cover plate and the mounting platform are respectively provided with a mounting hole, and the bolt penetrates through the mounting hole so as to fix the cover plate on the mounting platform.

Further, the armoured cable assembly includes armoured cable, electrode, connecting piece and installation cover, the installation cover is used for installing the electrode, the armoured cable with the connecting piece is connected, the connecting piece with the installation cover welds in order to form the welding seam, the mounting includes:

the mounting column is provided with the cavity with the open end and the leakage detection opening, the open end is used for penetrating one end of the mounting sleeve into the cavity, the sealing element is sleeved on the mounting sleeve, and the sealing element is erected at the open end;

the locking sleeve is provided with a locking cavity with an opening at one end and a first through hole which is positioned at the other end and communicated with the locking cavity, the locking sleeve is locked on the mounting column to extrude the sealing element to enable the mounting sleeve to be hermetically connected with the mounting column, and the armored cable penetrates through the first through hole.

Further, the leak detection structure further comprises a compression washer with a second through hole, the armored cable is arranged in the second through hole in a penetrating mode, and the compression washer is locked on the mounting column through the locking sleeve to squeeze the sealing element.

Furthermore, the outer peripheral surface of the compression washer is provided with a first outer peripheral surface and a second outer peripheral surface of a second step surface, one end of the compression washer, which is close to the first outer peripheral surface, is arranged on the mounting column, and the locking sleeve is locked on the second step surface.

Further, the locking sleeve has an internal thread, the mounting post has an external thread, the locking sleeve with mounting post threaded connection.

In another aspect of the embodiments of the present application, there is provided a leak detection apparatus for testing the sealability of a weld of an armored cable assembly, comprising:

the leak detection structure described in any one of the above; and

and the leak detector is communicated with the leak detection port to detect the tightness of the welding seam.

In another aspect of the embodiments of the present application, a leak detection method is provided, which is applied to the leak detection apparatus described above, and includes the following steps:

placing an end of an armored cable assembly to be inspected within the cavity;

operating the leak detector to vacuumize the leak detection port;

and injecting a test gas to the welding seam so as to judge the sealing property of the welding seam according to the indication change of the leak detector.

The leak detection structure provided by the embodiment of the application is used for detecting the sealing performance of the welding seam of the armored cable assembly and comprises a fixing piece and a sealing piece. The utility model discloses a leak hunting mouth of the electric cable subassembly of ionization chamber, including the fixing part, the cavity of opening end and with the leak hunting mouth of cavity intercommunication are formed to the fixing part, the leak hunting mouth is used for being connected with the leak detector, the cavity is used for holding the one end of armoured cable subassembly, establish the sealing member through the pot head at armoured cable subassembly, increase the leakproofness of armoured cable subassembly and fixing part, the leak detector can more accurately inspect the leakproofness of the welding seam of the armoured cable subassembly that is located the outside of sealing member, thereby discern the poor armoured cable subassembly of leakproofness, have the advantage that improves the leakproofness of ionization chamber armour. The application still provides a leak hunting device simultaneously for the leakproofness of inspection armoured cable assembly's welding seam. The application also provides a leak detection method, which is applied to the leak detection device provided by the embodiment of the application, is used for detecting the sealing property of the welding line of the armored cable assembly and has the advantage of improving the sealing property of the armored cable assembly.

Drawings

FIG. 1 is a schematic diagram of a leak detection structure in an embodiment of the present application;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a front view of a cover plate in an embodiment of the present application;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a front view of a mounting table in an embodiment of the present application;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a schematic structural view of another leak detection arrangement in an embodiment of the present application;

FIG. 8 is a cross-sectional view at the centerline of FIG. 7;

FIG. 9 is a front view of a mounting post in an embodiment of the present application;

fig. 10 is a front view of a compression washer in an embodiment of the present application;

FIG. 11 is a top view of FIG. 10;

FIG. 12 is a front view of the locking sleeve of the present embodiment;

FIG. 13 is a bottom view of FIG. 12;

FIG. 14 is a schematic structural view of an armored cable assembly to which connectors are welded according to an embodiment of the present application;

FIG. 15 is a schematic structural view of an armored cable assembly to which a mounting sleeve is welded according to an embodiment of the present application;

FIG. 16 is a schematic diagram of the structure of leak detection apparatus in an embodiment of the present application with the leak detection structure of FIG. 1 attached;

FIG. 17 is a schematic diagram of apparatus for leak detection in an embodiment of the present application to which the leak detection arrangement of FIG. 7 is connected; and

fig. 18 is a flow chart of a leak detection method in an embodiment of the present application.

Description of the reference numerals

1. A fixing member; 1a, a cavity; 1b, detecting a leakage port; 1c, a first cavity; 1d, a second cavity; 1e, a first step surface; 2. a seal member; 3. an armored cable; 4. a connecting member; 41. a flange; 5. installing a sleeve; 51. a first stage; 52. a second stage; 6. an electrode; 7. welding seams; 8. a leak detector; 11. an installation table; 12. a cover plate; 12a, a via hole; 12b, a gap; 12c, mounting holes; 12d, a limiting cavity; 13. mounting a column; 14. a locking sleeve; 14a, a locking cavity; 14b, a first through hole; 15. compressing the gasket; 15a, a second through hole; 15b, a first outer peripheral surface; 15c, a second outer circumferential surface; 15d, a second step surface; 100. a leak detection structure; 200. a leak detection device; 300. an armored cable assembly.

Detailed Description

It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.

The directional terms used in the description of the present application are intended only to facilitate the description of the application and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered limiting of the application.

In one aspect of the embodiments of the present application, a leak detection structure, as shown in fig. 1, 2, 7 and 8, is provided for testing the sealability of a weld 7 of an armored cable assembly 300, which includes a fixing member 1 and a sealing member 2. Fixing member 1 has a cavity 1a with an open end for inserting one end of armored cable assembly 300 into cavity 1a, and a leak detection port 1b communicating with cavity 1a for connection with leak detector 8 (see fig. 16 and 17); the sealing element 2 is configured to be sleeved at one end of the armored cable assembly 300, the sealing element 2 is located in the cavity 1a or overlapped at the open end so that the armored cable assembly 300 is connected with the fixing element 1 in a sealing mode, and the welding seam 7 is located on one side, close to the open end, of the sealing element 2.

The leak detection structure provided by the embodiment of the application is used for detecting the tightness of the welding seam 7 of the armored cable assembly 300. Form the cavity 1a of open end and the leak hunting mouth 1b that communicates with cavity 1a through mounting 1, leak hunting mouth 1b is used for being connected with leak detector 8, cavity 1a is used for holding the one end of armoured cable assembly 300, establish sealing member 2 through the pot head at armoured cable assembly 300, increase armoured cable assembly 300 and mounting 1's leakproofness, leak detector 8 can more accurately inspect the leakproofness of the welding seam 7 of the armoured cable assembly 300 that is located the outside of sealing member 2, thereby discern the poor armoured cable assembly 300 of leakproofness, have the advantage of the leakproofness that improves ionization chamber armoured cable assembly 300.

Illustratively, the leak detection port 1b may be formed at the other end opposite to the open end of the cavity 1a as shown in fig. 2 or 8. The leakage detecting opening 1b can also be formed on the side wall of the fixing member 1 to communicate with the cavity 1a, and the other end of the cavity 1a opposite to the opening end is a closed blind end. The weld 7 is located on the side of the sealing member 2 close to the open end, which means that the weld 7 is located outside the cavity 1a between the sealing member 2 and the leak detection port 1, and may be located inside the cavity 1a on the side of the sealing member 2 close to the open end, or located outside the cavity 1a on the side of the sealing member 2 close to the open end, so that externally injected test gas, such as helium, enters the cavity 1a between the sealing member 2 and the leak detection port 1 through the gap of the weld 7, the test gas flows into the leak detector 8 through the leak detection port 1b, and the leak detector 8 detects the test gas, thereby enabling the leak detector 8 to recognize the sealing performance of the weld 7.

In one embodiment, referring to fig. 14, an armored cable assembly 300 includes an armored cable 3 and a connector 4, the armored cable 3 and the connector 4 being welded to form a weld 7. Referring to fig. 1-6 in combination, the fixing member 1 includes a mounting base 11 and a cover plate 12. The mounting table 11 is provided with a cavity 1a with an opening end and a leakage detecting opening 1b, the cavity 1a comprises a first cavity 1c and a second cavity 1d which form a first step surface 1e and are communicated with each other, the opening end is formed at one end, away from the second cavity 1d, of the first cavity 1c, and the first step surface 1e faces the opening end; the opening end is used for penetrating one end of the connecting piece 4 into the cavity 1a, the sealing piece 2 is sleeved on the connecting piece 4, and the sealing piece 3 is positioned in the first cavity 1 c; the cover plate 12 is provided with a through hole 12a, the cover plate 12 covers the mounting platform 11 to extrude the sealing element 2 to enable the connecting element 4 to be connected with the mounting platform 11 in a sealing mode, and one end, far away from the connecting element 4, of the armored cable 3 penetrates through the through hole 12 a.

In a specific embodiment, a step is formed at one end of the connecting piece 4, the outer diameter of the step is larger than the inner diameter of the through hole 12a, one end of the connecting piece 4 far away from the step penetrates through the cavity 1a, and the welding seam 7 is positioned at one end of the connecting piece 4 close to the step; the sealing element 2 is sleeved at one end, far away from the step, of the connecting element 4, the sealing element 2 and the connecting element 4 are sleeved on the connecting element 4 in an interference fit mode, and the sealing element 2 is located in the first cavity 1c, so that the connecting element 4 is in sealing connection with the mounting table 11, and the welding line 7 is isolated from the sealed cavity 1 a. When the cover plate 12 is placed on the mount 11, the step of the connecting member 4 abuts against the end of the seal member 2 away from the first step surface 1e or a gap is formed. Preferably, sealing

member

2 and 4 interference fit cover of connecting piece are established and are served at one of connecting piece 4 keep away from the step, the step of connecting piece 4 and the one end butt that first step face 1e was kept away from to sealing member 2, the step forms seal structure with the one end butt that first step face 1e was kept away from to sealing member 2, the setting of multilayer seal structure, increase the leakproofness of sealing member 2 to armoured cable assembly 300, improve the reliability to the leakproofness inspection of the welding seam 7 of armoured cable assembly 300, and the step is set up on sealing member 2, when leak detector 8 was evacuated cavity 1a in the leak hunting process, can prevent armoured cable assembly 300 from being inhaled in cavity 1a, influence the leak hunting effect. It can be understood that, when the step of the connecting piece 4 and the end of the sealing piece 2 far away from the first step surface 1e are arranged in a clearance manner, when the leak detector 8 evacuates the cavity 1a in the leak detection process, and the armored cable assembly 300 is sucked into the cavity 1a, the arrangement of the step can prevent the whole armored cable assembly 300 from being sucked into the cavity 1a to influence the leak detection effect.

The cavity 1a comprises a first cavity 1c and a second cavity 1d which are communicated to form a first step surface 1e, one end of the first cavity 1c, which is far away from the second cavity 1d, forms an opening end of the cavity 1a, the first step surface 1e faces the opening end, and the sealing member 2 is positioned in the first cavity 1 c. 4 covers of connecting piece establish the one end at armoured cable 3, armoured cable 3 welds with connecting piece 4 and is equipped with sealing member 2, the setting is in cavity 1a of mount table 11, apron 12 lid is established on mount table 11, make connecting piece 4 and mount table 11 sealing connection with extrusion sealing member 2, fix sealing member 2 and armoured cable subassembly 300, the one end that connecting piece 4 was kept away from to armoured cable 3 is worn to locate via hole 12a and is exposed welding seam 7, keep apart welding seam 7 and sealed cavity 1a position, in order to inspect the leakproofness of welding seam 7 to armoured cable subassembly 300.

The end of the armored cable 3 remote from the connector 4 is inserted through the through hole 12a and exposes the weld 7, meaning that the weld 7 is visible from the exterior of the leak detection structure 100. Due to the thickness of the cover 12, the cover 12 forms an enclosure space around the weld 7 of the armored cable assembly 300 at the through hole 12a, i.e. the weld 7 is located in the through hole 12 a. In the process of helium spraying and leakage detection of the welding seam 7, helium is sprayed into the surrounding space, so that the leakage detection efficiency can be improved, and the helium spraying amount can be reduced.

The cavity 1a includes a first cavity 1c and a second cavity 1d communicating with each other to form a first step surface 1e, the first step surface 1e facing the opening end, and a seal member 2 located in the first cavity 1 c. When the leak detector 8 evacuates the cavity 1a during leak detection, the first cavity 1c forming the first step surface 1e can prevent the sealing member 2 from being sucked into the cavity 1a because the sealing member 2 is arranged in the first cavity 1c, thereby improving the reliability of the leak detection apparatus 200.

In one embodiment, as shown in fig. 2 and 14, one end of the connecting member 4 is formed with a flange 41, the outer diameter of the flange 41 is larger than the inner diameter of the through hole 12a, one end of the connecting member 4 far away from the flange 41 is inserted into the cavity 1a, and the welding seam 7 is located at one end of the connecting member 4 near the flange 41; the flange 41 has an outer diameter smaller than an inner diameter of the first cavity 1c, and when the cover plate 12 is placed on the mounting table 11, the flange 41 is located in the first cavity 1c to press the sealing member 2.

In an embodiment, the sealing element 2 is sleeved on one end of the connecting element 4 far away from the flange 41, the sealing element 2 and the connecting element 4 are sleeved on the connecting element 4 in an interference fit manner, and the sealing element 2 is located in the first cavity 1c, so that the connecting element 4 is in sealed connection with the mounting platform 11. When the cover plate 12 is placed on the mount 11, the flange 41 abuts against or has a gap with one end of the seal 2 away from the first step surface 1 e. Preferably, sealing

member

2 and 4 interference fit cover of connecting piece establish on one of connecting piece 4 keep away from flange 41, flange 41 and sealing member 2 keep away from the one end butt of first step face 1e and form seal structure, multilayer seal structure's setting, increase the leakproofness of sealing member 2 to armored cable assembly 300, improve the reliability to the leakproofness inspection of the welding seam 7 of armored cable assembly 300, and flange 41 sets up on sealing member 2, when leak hunting appearance 8 is to cavity 1a evacuation in the leak hunting process, can prevent armored cable assembly 300 from being inhaled in cavity 1a, influence the leak hunting effect.

In a specific embodiment, referring to fig. 2, the sealing element 2 is sleeved at one end of the connecting element 4 away from the flange 41, the sealing element 2 is in clearance fit with one end of the connecting element 4 away from the flange 41, the flange 41 of the connecting element 4 is abutted against one end of the sealing gasket away from the first step surface 1e to form a sealing structure, at this time, the cover plate 12 is covered on the mounting table 11, and pressure is formed on the flange 41 of the connecting element 4, so that the flange 41 is in close contact with the sealing element 2, and the connecting element 4 is in sealing connection with the mounting table 11.

In a specific embodiment, the sealing element 2 is sleeved on one end of the flange 41 of the connecting element 4, the sealing element 2 and the flange 41 are arranged on the connecting element 4 in an interference fit manner, at this time, the cover plate 12 is covered on the mounting table 11, and the sealing element 2 is pressed to form pressure on the flange 41 of the connecting element 4, so that the flange 41 is in tight contact with the sealing element 2, and the connecting element 4 is in sealed connection with the mounting table 11.

In one embodiment, referring to fig. 2 and 14, one end of the connecting member 4 is formed with a flange 41, the outer diameter of the flange 41 is larger than the inner diameter of the through hole 12a, one end of the connecting member 4 far away from the flange 41 is inserted into the cavity 1c, and the welding seam 7 is located at one end of the connecting member 4 near the flange 41; the outer diameter of the flange 41 is larger than the inner diameter of the first cavity 1c, a limit cavity matched with the flange 41 is formed on the cover plate 12, the height of the sealing element 2 is larger than that of the first cavity 1c, and when the cover plate 12 covers the installation platform 11, the flange 41 is positioned outside the first cavity 1c to extrude the sealing element 2.

In a specific embodiment, the sealing element 2 is sleeved on one end of the connecting element 4 far away from the flange 41, the height of the sealing element 2 is greater than that of the first cavity 1c, when the cover plate 12 covers the mounting platform 11 to form extrusion force on the flange, the flange 41 is located in the limiting cavity 12d formed on the cover plate 12, and the sealing element 2 is extruded outside the first cavity 1c, so that the connecting element 4 is hermetically connected with the mounting platform 11. The flange 41 abuts against the mount 11 or has a gap; preferably, flange 41 and mount table 11 butt, when leak detector 8 was evacuated to cavity 1a in the leak hunting process, can prevent that armoured cable assembly 300 from producing the displacement because of the atress, influencing the leak hunting effect, and the stability of device has been improved to flange 41 and mount table 11 butt.

In a specific embodiment, the sealing element 2 is sleeved at one end of the connecting element 4 far away from the flange 41, the height of the sealing element 2 is greater than that of the first cavity 1c, when the cover plate 12 covers the mounting platform 11 to form extrusion force on the flange, the flange 41 is located in the limiting cavity 12d formed on the cover plate 12, and the sealing element 2 is extruded outside the first cavity 1c, so that the connecting element 4 is in sealing connection with the mounting platform 11, and the sealing element 2 is in butt joint with one end of the connecting element 4 far away from the flange 41 in a clearance fit manner. Preferably, the sealing element 2 abuts against one end of the connecting element 4 away from the flange 41, and the sealing element 2 is provided with a multi-layer sealing structure, so that the sealing performance of the sealing element 2 on the armored cable assembly 300 is improved, and the reliability of the sealing performance test on the welding seam 7 of the armored cable assembly 300 is improved.

Specifically, the sealing member 2 is an elastic sealing ring, and more specifically, the sealing member 2 is a rubber sealing ring.

In one embodiment, as shown in fig. 1 to 4, the cover plate 12 has a notch 12b communicating with the through hole 12a, and the notch 12b penetrates through an edge of the cover plate 12. The one end that armoured cable 3 kept away from connecting piece 4 wears to locate via hole 12a, and when armoured cable 3 was connected with the size of the one end of connecting piece 4 and was greater than via hole 12a, the one end that armoured cable 3 kept away from connecting piece 4 wore to locate via hole 12a through opening 12b to install connecting piece 4 in the cavity 1a of mount table 11. Prevent that the other end that need not keep away from connecting piece 4 through armoured cable 3 passes via hole 12a and then wears to locate via hole 12a because of armoured cable 3 overlength, practice thrift installation time, improve work efficiency.

In one embodiment, referring to fig. 1 and 2, the leak detection structure 100 further includes bolts, and the cover plate 12 and the mounting block 11 respectively have mounting holes 12c, and the bolts are inserted through the mounting holes 12c to fix the cover plate 12 to the mounting block 11. The cover plate 12 is fixed to the mounting table 11 by bolts, and the cover plate 12 further presses the connecting member 4 to improve the sealing performance of the sealing member 2, the connecting member 4, and the mounting table 11. The number of the bolts may be 1 or more, for example, 1, 2, 3, 4, or 5, and specifically, the number of the bolts is 4.

In one embodiment, the mounting holes 12c are threaded holes, and bolts are inserted into the threaded holes to fix the cover plate 12 to the mounting platform 11.

In an embodiment, the mounting hole 12c is a third through hole, and the cover plate 12 is fixed on the mounting platform 11 by the bolt passing through the third through hole and the nut.

In one embodiment, referring to fig. 7 to 13 and fig. 15, the armored cable assembly 300 includes an armored cable 3, a connecting member 4 and a mounting sleeve 5, the mounting sleeve 5 is used for mounting the electrode 6, the armored cable 3 is connected with the connecting member 4, the connecting member 4 is welded with the mounting sleeve 5 to form a welding seam 7, and the fixing member 1 includes a mounting column 13 and a locking sleeve 14. The mounting column 13 is provided with a cavity 1a with an open end and a leakage detecting port 1b, the open end is used for penetrating one end of the mounting sleeve 5 into the cavity 1a, the sealing element 2 is sleeved on the mounting sleeve 5, and the sealing element 2 is erected at the open end of the cavity 1 a; the locking sleeve 14 is provided with a locking cavity 14a with an opening at one end and a first through hole 14b which is positioned at the other end and communicated with the locking cavity 14a, the locking sleeve 14 is locked on the mounting column 13 so as to extrude the sealing element 2 to enable the mounting sleeve 5 to be in sealing connection with the mounting column 11, and the armored cable 3 penetrates through the first through hole 14 b.

Referring to fig. 7 to 8, the sealing element 2 and the mounting sleeve 5 are sleeved on the mounting sleeve 5 in an interference fit manner, the sealing element 2 is erected at an opening end of the cavity 1a, the sealing element 2 is locked on the mounting column 13 by the locking cavity 14a of the locking sleeve 14, and pressure is formed on the sealing element 2, so that the mounting sleeve 5 is in sealing connection with the mounting column 13. The welding seam 7 formed by welding the connecting piece 4 and the mounting sleeve 5 is positioned outside the closed cavity 1a formed by the mounting sleeve 5, the sealing piece 2 and the mounting column 13 so as to test the tightness of the welding seam 7 of the armored cable assembly 300.

In an embodiment, referring to fig. 7 to 13 and fig. 15, an electrode 6 is installed in the installation sleeve 5, one end of the installation sleeve 5 of the armored cable assembly 300 with the electrode 6 is disposed in the accommodating cavity, the sealing element 2 is in interference fit with the installation sleeve 5 and sleeved on the installation sleeve 5, the sealing element 2 is erected at an opening end of the cavity 1a, the sealing element 2 is locked on the installation column 13 by the locking cavity 14a of the locking sleeve 14, pressure is formed on the sealing element 2, so that the installation sleeve 5 is in sealing connection with the installation column 13, and the sealing performance of the welding seam 7 of the armored cable assembly 300 with the electrode 6 is tested. Specifically, the electrode 6 is a ceramic insulated electrode 6. It is to be understood that the leak detection structure provided by the embodiments of the present application can provide leak detection of armored cable assembly 300 having mounting sleeve 5 with other components mounted thereto.

In one embodiment, referring to fig. 7-13 and 15, the leak detection structure 100 further includes a compression washer 15 having a second through hole 15a, the armored cable 3 is inserted through the second through hole 15a, and the locking sleeve 14 locks the compression washer 15 to the mounting post 13 to compress the sealing member 2. The compression washer 15 is mounted on the sealing element 2 to compress the sealing element 2, the locking sleeve 14 locks the compression washer 15 on the mounting column 13, and the compression washer 15 and the mounting column 13 form compression force on the sealing element 2 under the action of the locking sleeve 14, so that the sealing performance of the mounting column 13, the mounting sleeve 5 and the compression washer 15 is further improved. And by providing the compression washer 15, the locking sleeve 14 is prevented from directly contacting the sealing element 2 during the rotation locking process to cause damage to the sealing element 2, and the reliability of the tightness test of the welding seam 7 of the armored cable assembly 300 is improved.

In one embodiment, as shown in fig. 7, 8, 10 and 11, the compression washer 15 is a ring washer that is mounted on the seal 2 to compress the seal 2, and the locking collar 14 is locked to an end of the ring washer remote from the seal 2 to lock the compression washer 15 to the mounting post 13.

In one embodiment, referring to fig. 7, 8, 10 and 11, the outer peripheral surface of the compression washer 15 is formed with a first outer peripheral surface 15b and a second outer peripheral surface 15c of a second step surface 15d, one end of the compression washer 15 close to the first outer peripheral surface 15b is arranged on the mounting post 13, the locking sleeve 14 is locked on the second step surface 15d, and the compression washer 15 presses on the sealing element 2, so that the locking sleeve 14 is prevented from directly contacting the sealing element 2 during locking to damage the sealing performance and the service life of the sealing element, and the structural stability is increased.

Specifically, referring to fig. 16, the mounting sleeve 5 of the armored cable assembly 300 includes a first section 51 and a second section 52 connected to the first section 51, the diameter of the second section 52 is larger than that of the first section 51, a flange 41 is formed at one end of the connecting member 4 away from the end of the armored cable 3, the armored cable 3 is fixedly connected to the flange 41, and the end of the first section 51 of the mounting sleeve 5 is fixedly welded to the flange 41 to form a welding seam 7.

In one embodiment, the armored cable 3 comprises 3 layers, the outer layer is stainless steel, the middle layer is copper, and the inner layer is soft iron. The electrode 6 is a ceramic insulated electrode 6. Wherein, the welding process has two welding seams 7, the two welding seams 7 formed by welding the armored cable 3 with the flange 41 of the connecting piece 4 and welding the connecting piece 4 with the mounting sleeve 5 are all girth welding seams 7, and the welding process is laser welding. The material of the connecting piece 4 is 310S stainless steel.

In an embodiment, referring to fig. 7 to 13 and fig. 15, the sealing element 2 is sleeved on the second section 52 of the mounting sleeve 5, the sealing element 2 is overlapped on the opening end of the cavity 1a, the pressing washer 15 is mounted on the sealing element 2 to press the sealing element 2, the locking sleeve 14 locks the pressing washer 15 on the mounting post 13, the pressing washer 15 and the mounting post 13 form a pressing force on the sealing element 2 under the action of the locking sleeve 14, so that the sealing performance of the mounting post 13, the mounting sleeve 5 and the pressing washer 15 is further increased, and the reliability of the sealing performance test on the welding seam 7 of the armored cable assembly 300 is improved.

In a specific embodiment, the sealing element 2 is sleeved on the first section 51 of the mounting sleeve 5 and located on one side, close to the second section 52, of the welding seam 7 formed by welding the end of the first section 51 and the flange 41, the sealing element 2 is overlapped on the open end of the cavity 1a, the compression gasket 15 is installed on the sealing element 2 to compress the sealing element 2, the compression gasket 15 is locked on the mounting column 13 by the locking sleeve 14, the compression gasket 15 and the mounting column 13 form a compression force on the sealing element 2 under the action of the locking sleeve 14, the sealing performance of the mounting column 13, the mounting sleeve 5 and the compression gasket 15 is further increased, and the reliability of the tightness test on the welding seam 7 of the armored cable assembly 300 is improved.

In a specific embodiment, the fixing element 1 includes the mounting post 13, the sealing element 2 is sleeved on the first section 51 of the mounting sleeve 5 and is located on one side of the welding seam 7 formed by welding the end of the first section 51 and the flange 41, which is close to the second section 52, the sealing element 2 is sleeved on the first section 51 of the mounting sleeve 5 in an interference fit manner with the first section 51 of the mounting sleeve 5, and the interference fit is arranged in the cavity 1a, so that the mounting post 13 is hermetically connected with the mounting sleeve 5, and the tightness of the welding seam 7 formed by welding and fixing the end of the first section 51 of the mounting sleeve 5 and the flange 41 is checked.

In a specific embodiment, referring to fig. 7 to 13 and fig. 15, the fixing element 1 includes a mounting post 13, the sealing element 2 is sleeved on the second section 52 of the mounting sleeve 5, the sealing element 2 and the second section 52 of the mounting sleeve 5 are sleeved on the second section 52 of the mounting sleeve 5 in an interference fit manner, and the sealing element 2 and the second section 52 of the mounting sleeve 5 are arranged in the cavity 1a in an interference fit manner, so that the mounting post 13 and the mounting sleeve 5 are hermetically connected, and the sealing performance of the weld seam 7 formed by welding and fixing the end of the first section 51 of the mounting sleeve 5 and the flange 41 is tested.

In one embodiment, the locking sleeve 14 has internal threads and the mounting post 13 has external threads, and the locking sleeve 14 is threadably coupled to the mounting post 13. Specifically, the pressing washer 15 is arranged on the sealing element 2 to press the sealing element 2, the first through hole 14b of the locking sleeve 14 is sleeved on the mounting column 13, the locking cavity 14a is located on the pressing washer 15, the locking sleeve 14 is rotated, and through the threaded fit between the locking sleeve 14 and the mounting column 13, the locking cavity 14a is locked on the second step surface 15d of the pressing washer 15 to extrude the sealing element 2, so that the mounting sleeve 5 is in sealed connection with the mounting column 11, and the armored cable 3 penetrates through the first through hole 14b and the second through hole 15 a. It is understood that the locking sleeve 14 and the mounting post 13 may be connected by a snap connection, a screw connection, or the like.

In another aspect of the embodiments of the present application, referring to fig. 16 and 17, there is provided a leak detection apparatus for testing the sealability of a weld seam 7 of an armored cable assembly 300, including the leak detection structure 100 of any of the above embodiments and a leak detector 8, the leak detector 8 communicating with the leak detection port 1b to test the sealability of the weld seam 7. Fixing member 1 has one end open-ended cavity 1a and leak hunting mouth 1b with cavity 1a intercommunication, cavity 1a is used for holding the one end that armoured cable assembly 300 is close to welding seam 7, leak hunting mouth 1b is used for being connected with leak detector 8, sealing member 2 configures to and makes armoured cable assembly 300 and fixing member 1 sealing connection, and cavity 1a of fixing member 1 forms the confined space this moment, and welding seam 7 is outside the confined space to inspect the leakproofness of welding seam 7 of armoured cable assembly 300.

In one embodiment, and as shown in fig. 16 and 17, leak detector 8 is sealingly connected to leak port 1b by a clamp, wherein cavity 1a of fixture 1 forms a sealed space to test the leak tightness of weld 7 of armored cable assembly 300.

In another aspect of the embodiments of the present application, referring to fig. 18, there is provided a leak detection method applied to the leak detection apparatus of any one of the embodiments described above, including the steps of:

s1: placing one end of an armored cable assembly to be inspected in the cavity;

s2: operating the leak detector to vacuumize the leak detection port;

s3: and injecting a test gas to the weld joint to judge the tightness of the weld joint according to the indication change of the leak detector.

The leakage rate is an important index representing the sealing performance, and the service life of the high-temperature fission ionization chamber is directly influenced by the sealing performance. At present, the existing leak detection method is generally a leak detection method under normal temperature conditions. The most commonly used leak detection method is the helium mass spectrometer leak detection method. The method can be divided into two types according to the measurement purpose of the detected piece, wherein one type is a leakage point measuring type, and the other type is an overall leakage rate measuring type; in the actual inspection process, the most reasonable method is selected according to the purpose of inspection, and various leak detection methods are flexibly applied according to the specific conditions of the device to be inspected. In the normal-temperature leak detection process of the armored cable assembly 300, leak points of two welding seams 7 formed by welding the armored cable 3 and the flange 41 of the connecting piece 4 and welding the connecting piece 4 and the mounting sleeve 5 need to be respectively measured, whether the requirements are met is judged, and a helium spraying method is adopted for the two welding seams 7 of the armored cable assembly 300.

The steps of the leak detection method of the embodiment of the present application will be described in detail below.

S1: placing one end of an armored cable assembly to be inspected in the cavity;

referring to fig. 2 and fig. 7, a sealing element 2 is sleeved on a place to be sealed of an armored cable assembly 300 to be tested, one end of the armored cable assembly 300 to be tested, which is close to a welding seam 7, is placed in a cavity 1a, the sealing element 2 is placed in the cavity 1a, so that the armored cable assembly 300 is in sealing connection with a fixing element 1, and the welding seam 7 is located on the outer side of the sealing element 2.

S2: operating the leak detector to vacuumize the leak detection port;

in one embodiment, the leak detector 8 is in communication with and sealingly coupled to the leak port 1b, as shown in FIG. 16. Since the armored cable assembly 300 to be inspected and the fixing member 1 are hermetically connected by the sealing member 2, the cavity 1a of the fixing member 1 forms a sealed space, and the welding seam 7 is outside the sealed space.

In a specific embodiment, and as shown in fig. 16, leak detector 8 is sealingly connected to leak port 1b by a clamp, wherein cavity 1a of fixture 1 forms a sealed space for testing the leak tightness of weld 7 of armored cable assembly 300 to be tested.

In one embodiment, leak detector 8 is operated to evacuate leak port 1 b. When the pressure of the leak detection opening 1b is lower than 10 after vacuum pumping^-1When Pa, after the reading is stable, reading the reading at the moment. At the moment, the reading is the leakage rate of the welding seam 7 of the armored cable 3 to be detected.

In one embodiment, leak detector 8 is operated to evacuate leak port 1b, and then test gas is injected into weld bead 7 to observe whether the reading of leak detector 8 changes dramatically. If the welding quality of the welding seam 7 is not changed seriously, the welding quality is good; if the welding quality of the welding seam 7 is changed violently, the welding quality is poor, the sealing performance is poor, and the requirements are not met.

In one embodiment, the leak detector 8 is a helium mass spectrometer leak detector 8 and the test gas is helium. And operating the helium mass spectrometer leak detector 8 to vacuumize the leak detection port 1b, spraying a small amount of helium to the welding line 7, and observing whether the reading of the helium mass spectrometer leak detector 8 is changed violently. If the welding quality of the welding seam 7 is not changed seriously, the welding quality is good; if the welding quality of the welding seam 7 is changed violently, the welding quality is poor, the sealing performance is poor, and the requirements are not met.

In one embodiment, the helium spray method includes starting from the side near the leak detector 8 to the side away from the leak detector 8 with a near-to-far spray; helium is sprayed from top to bottom in the vertical direction. Helium is sprayed by a spray gun at the welding seam 7 of the armored cable assembly 300 to be detected, if a leak hole exists at the welding seam 7 of the armored cable assembly 300 to be detected, when helium is sprayed on the leak hole, the helium is immediately sucked into a vacuum system and then diffused into a mass spectrum chamber, and the output of a helium mass spectrum leak detector 8 immediately responds. Since helium gas is a light inert gas and can automatically rise after being sprayed, in order to accurately spray helium at the position of the welding seam 7, helium should be sprayed from top to bottom in the vertical direction during helium spraying, and the helium is sprayed from near to far from the side close to the leak detector 8 to the side far from the leak detector 8. Since helium may be sucked by the upper leak when helium is sprayed under the armored cable assembly 300 to be inspected, it is difficult to determine the location of the leak; furthermore, the reaction time of the leak orifice from the mass spectrometer chamber to the leak detector 8 is different, so that the helium spray should start from near to far from the side close to the leak detector 8 to the side far from the leak detector 8.

In one embodiment, the armored cable assembly 300 includes an armored cable 3 and a connector 4, the connector 4 is sleeved on one end of the armored cable 3, a flange 41 is formed on one end of the connector 4 far from the end of the armored cable 3, the armored cable 3 is welded with the flange 41 to form a welding seam 7, and the fixing member 1 includes a mounting platform 11 and a cover plate 12. The mounting table 11 is provided with a cavity 1a with an opening at one end and a leakage detection opening 1b, the cavity 1a is used for accommodating the connecting piece 4, the sealing piece 2 is sleeved on the connecting piece 4, and the sealing piece 2 is positioned in the cavity 1a so that the connecting piece 4 is in sealing connection with the mounting table 11; the cover plate 12 is provided with a through hole 12a, the cover plate 12 is covered on the mounting table 11, and one end of the armored cable 3 to be inspected, which is far away from the connecting piece 4, penetrates through the through hole 12 a. The leak detector 8 is connected to the leak detection port 1b in a sealing manner, and at this time, the cavity 1a of the mounting table 11 forms a sealed space, and the weld 7 formed by welding the armored cable 3 to the flange 41 is located outside the sealed space, so that the sealing performance of the weld 7 formed by welding the armored cable 3 to the flange 41 is checked. Test gas is injected to a weld 7 formed by welding the armored cable 3 and the flange 41 to judge the tightness of the weld 7 according to the change of the indication of the leak detector 8.

In one embodiment, the armored cable assembly 300 comprises an armored cable 3, a connecting member 4 and a mounting sleeve 5, the mounting sleeve 5 is used for mounting an electrode 6, the armored cable 3 is connected with the connecting member 4, the connecting member 4 is welded with the mounting sleeve 5 to form a welding seam 7, and the fixing member 1 comprises a mounting column 13 and a locking sleeve 14. The mounting column 13 is provided with a cavity 1a with an opening at one end and a leakage detection opening 1b, the cavity 1a is used for accommodating the mounting sleeve 5, the sealing element 2 is sleeved on the mounting sleeve 5, and the sealing element 2 is erected at the opening end of the cavity 1a so as to enable the mounting sleeve 5 to be connected with the mounting column 13 in a sealing mode; the locking sleeve 14 is provided with a locking cavity 14a with one end opened and a first through hole 14b which is positioned at the other end and communicated with the locking cavity 14a, the locking sleeve 14 is locked on the mounting column 13, and the armored cable 3 is arranged through the first through hole 14 b. The leak detector 8 is hermetically connected with the leak detection port 1b, at the moment, the cavity 1a of the mounting column 13 forms a sealed space, and a welding seam 7 formed by welding the connecting piece 4 and the mounting sleeve 5 is positioned outside the sealed space so as to test the sealing performance of the welding seam 7 formed by welding the connecting piece 4 and the mounting sleeve 5 of the armored cable 3. And (3) injecting test gas to a welding seam 7 formed by welding the connecting piece 4 and the mounting sleeve 5 so as to judge the tightness of the welding seam 7 according to the indication change of the leak detector 8.

The leak detection structure, the leak detection device and the leak detection method provided by the embodiment of the application are used for detecting the sealing property of the welding seam 7 of the armored cable assembly 300 under the normal temperature condition. The method is used as a basis for exploring the welding process parameters and the process flow of the armored cable assembly 300 meeting the sealing performance requirement under the high-temperature condition. If the sealing property is poor at normal temperature, the sealing property is also poor at high temperature due to expansion with heat and contraction with cold. Through the leak detection structure 100, the leak detection device 200 and the leak detection method provided by the embodiment of the application, the leak rate of the welding seam 7 of the armored cable assembly 300 under the normal temperature condition can be accurately obtained, and on the premise of meeting the requirement of the leak rate in the relevant national standard, the research of welding process parameters under the high temperature condition is carried out. The leak detection structure, the leak detection device and the leak detection method provided by the embodiment of the application are favorable for detecting the tightness of the welding seam 7 of the armored cable assembly 300 under the high-temperature condition.

The various embodiments/implementations provided herein may be combined with each other without contradiction.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A leak detection structure for checking sealability of a weld (7) of an armored cable assembly (300), comprising:

the fixing piece (1) is provided with a cavity (1a) with an open end and a leak detection port (1b) communicated with the cavity (1a), the open end is used for penetrating one end of the armored cable assembly (300) into the cavity (1a), and the leak detection port (1b) is used for being connected with a leak detector (8); and

the sealing element (2) is configured to be sleeved at one end of the armored cable assembly (300), the sealing element (2) is located in the cavity (1a) or overlapped at the opening end so that the armored cable assembly (300) is in sealing connection with the fixing element (1), and the welding seam (7) is located on one side, close to the opening end, of the sealing element (2).

2. Leak detection arrangement according to claim 1, wherein the armoured cable assembly (300) comprises an armoured cable (3) and a connector (4), the armoured cable (3) being welded with the connector (4) to form the weld seam (7), the fixing (1) comprising:

the mounting table (11) is provided with the cavity (1a) with the opening end and the leakage detection opening (1b), the cavity (1a) comprises a first cavity (1c) and a second cavity (1d) which form a first step surface (1e) and are communicated with each other, one end, far away from the second cavity (1d), of the first cavity (1c) forms the opening end, and the first step surface (1e) faces the opening end; the opening end is used for penetrating one end of the connecting piece (4) into the cavity (1a), the sealing piece (2) is sleeved on the connecting piece (4), and the sealing piece (2) is located in the first cavity (1 c); and

the cover plate (12) is provided with a through hole (12a), the cover plate (12) covers the installation platform (11) to extrude the sealing element (2) to enable the connecting element (4) to be in sealing connection with the installation platform (11), and one end, far away from the connecting element (4), of the armored cable (3) penetrates through the through hole (12 a).

3. Leak detection structure according to claim 2, wherein one end of the connector (4) is formed with a flange (41), the flange (41) having an outer diameter larger than the inner diameter of the through hole (12a), the end of the connector (4) remote from the flange (41) being inserted into the cavity (1a), the weld (7) being located at the end of the connector (4) close to the flange (41);

the outer diameter of the flange (41) is smaller than the inner diameter of the first cavity (1c), and when the cover plate (12) is covered on the mounting table (11), the flange (41) is positioned in the first cavity (1c) to press the sealing member (2); or the like, or, alternatively,

the outer diameter of the flange (41) is larger than the inner diameter of the first cavity (1c), a limiting cavity (12d) matched with the flange (41) is formed in the cover plate (12), the height of the sealing element (2) is larger than that of the first cavity (1c), and when the cover plate (12) is covered on the installation table (11), the flange (41) is located outside the first cavity (1c) to extrude the sealing element (2).

4. Leak detection structure according to claim 2, characterised in that the cover plate (12) has a cutout (12b) communicating with the via (12a), the cutout (12b) extending through the edge of the cover plate (12).

5. Leak detection structure according to claim 2, wherein the leak detection structure (100) further comprises bolts, and the cover plate (12) and the mount base (11) have mounting holes (12c), respectively, and the bolts are inserted through the mounting holes (12c) to fix the cover plate (12) to the mount base (11).

6. Leak detection arrangement according to claim 1, wherein the armoured cable assembly (300) comprises an armoured cable (3), an electrode (6), a connector (4) and a mounting sleeve (5), the mounting sleeve (5) being adapted to mount the electrode (6), the armoured cable (3) being connected to the connector (4), the connector (4) being welded to the mounting sleeve (5) to form the weld seam (7), the fixture (1) comprising:

the mounting column (13) is provided with the cavity (1a) with the open end and the leakage detecting opening (1b), the open end is used for penetrating one end of the mounting sleeve (5) into the cavity (1a), the sealing element (2) is sleeved on the mounting sleeve (5), and the sealing element (2) is erected at the open end;

the locking sleeve (14) is provided with a locking cavity (14a) with an opening at one end and a first through hole (14b) which is positioned at the other end and communicated with the locking cavity (14a), the locking sleeve (14) is locked on the mounting column (13) so as to extrude the sealing element (2) to enable the mounting sleeve (5) to be in sealing connection with the mounting column (13), and the armored cable (3) penetrates through the first through hole (14 b).

7. Leak detection structure according to claim 6, characterised in that the leak detection structure (100) further comprises a compression washer (15) with a second through hole (15a), the armoured cable (3) being passed through the second through hole (15a), the locking sleeve (14) locking the compression washer (15) against the mounting column (13) to compress the seal (2).

8. Leak detection structure according to claim 7, characterised in that the outer peripheral surface of the pressure washer (15) is formed with a first outer peripheral surface (15b) and a second outer peripheral surface (15c) of a second step surface (15d), the end of the pressure washer (15) close to the first outer peripheral surface (15b) being arranged on the mounting column (13), the locking sleeve (14) being locked on the second step surface (15 d).

9. Leak detection structure according to claim 6, wherein the locking sleeve (14) is internally threaded and the mounting column (13) is externally threaded, the locking sleeve (14) being in threaded connection with the mounting column (13).

10. Leak detection apparatus for checking the tightness of a weld (7) of an armored cable assembly (300), characterized by comprising:

leak detection structure (100) according to any of claims 1 to 9; and

and the leak detector (8) is communicated with the leak detection opening (1b) to detect the tightness of the welding seam (7).

11. Leak detection method applied to leak detection apparatus (200) as claimed in claim 10, characterized by comprising the steps of:

-placing one end of an armored cable assembly (300) to be inspected in said cavity (1 a);

operating the leak detector (8) to vacuumize the leak detection port (1 b);

and injecting a test gas to the welding seam (7) to judge the tightness of the welding seam (7) according to the indication change of the leak detector (8).