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CN-121977758-A - Device and method for detecting tightness of bolt sealant at key butt joint part of combined electrical appliance

CN121977758ACN 121977758 ACN121977758 ACN 121977758ACN-121977758-A

Abstract

The invention provides a device and a method for detecting tightness of bolt sealant at key butt joint parts of a combined electrical apparatus, and relates to the technical field of manufacturing and detection of high-voltage electrical equipment. Through the detection cavity of the internal integrated baffle, the edge below the baffle is packaged with a special flexible silica gel sealing layer, and the miniature balloon in the silica gel is inflated through an air pipe during operation, so that the silica gel is completely covered on the surface of the bolt gluing layer. During operation, the detection cavity is inverted and pressed on the surface of the bolt and the nut coated with the sealant, and the silica gel layer under the partition plate is tightly attached to the outer edge of the nut at the moment, so that the whole cavity is divided into two independent and mutually isolated closed spaces, each space forms a juncture with the sealing adhesive tape to be detected, the tightness is judged by observing the gas flow, and the life maintenance cost and the resource waste caused by leakage are reduced.

Inventors

  • LV SHUAISHUAI
  • WANG PENGFEI
  • CHEN JI
  • WANG BO
  • CHEN YUFEI
  • NI HONGJUN
  • ZHU YU
  • WANG XINGXING
  • TAN LINWEI

Assignees

  • 南通大学

Dates

Publication Date
20260505
Application Date
20260130

Claims (10)

  1. 1. The device is characterized by comprising a detection cavity (1), wherein a partition plate (2) is arranged in the detection cavity (1), the partition plate (2) is used for dividing the internal space of the detection cavity (1) into two parts, one part of the space is communicated with the outside through a first air pipe (3), a penetrating groove (4) is formed in the bottom of the partition plate (2), and a flexible silica gel sealing layer (5) is arranged in the penetrating groove (4).
  2. 2. The device for detecting the tightness of the bolt sealant at the key butt joint part of the combined electrical apparatus according to claim 1 is characterized in that the whole detection cavity (1) is hemispherical, a cavity is formed in the detection cavity, the partition plate (2) is vertically arranged in the middle position in the cavity, and the side wall is attached to the inner wall of the cavity.
  3. 3. The device for detecting the tightness of the bolt sealant at the key butt joint part of the combined electrical apparatus according to claim 2 is characterized in that the bottom of the partition plate (2) and the bottom of the detection cavity (1) are positioned on the same horizontal plane.
  4. 4. The device for detecting the sealing performance of the bolt sealing glue at the key butt joint part of the combined electrical apparatus according to claim 3 is characterized in that a balloon is arranged in the flexible silica gel sealing layer (5), an air inlet of the balloon penetrates through the flexible silica gel sealing layer (5) to be connected with the air pipe II (6), and the air pipe II (6) penetrates upwards through the partition plate (2) to be communicated with the outside.
  5. 5. The device for detecting the tightness of the bolt sealing glue at the key butt joint part of the combined electrical apparatus according to claim 4, wherein the penetrating groove (4) is formed in the middle position of the bottom of the partition board (2) and penetrates through the partition board (2) transversely.
  6. 6. The device for detecting the sealant tightness of the bolt at the key butt joint part of the combined electrical apparatus according to claim 5, wherein the notch size of the through groove (4) is larger than the head size of the bolt (11) to be detected.
  7. 7. The device for detecting the sealing performance of the bolt sealing glue at the key butt joint part of the combined electrical apparatus according to claim 6, wherein the detection cavity (1) is made of transparent materials.
  8. 8. The device for detecting the tightness of the bolt sealing glue at the key butt joint part of the combined electrical apparatus according to claim 7 is characterized in that sealing rings (10) are arranged at the bottom of the detection cavity (1) and the bottom of the partition plate (2).
  9. 9. A method for detecting the sealant tightness of a key butt joint part bolt of a combined electrical apparatus based on the sealant tightness detection device for the key butt joint part bolt of the combined electrical apparatus according to any one of claims 1 to 9, comprising the following steps: Laminating the bottom of the detection cavity (1) on a plane provided with a bolt (11), pressing a flexible silica gel sealing layer (5) in a penetrating groove (4) on the surface of a bolt (11) nut coated with sealant (9), dividing the whole cavity of the partition plate (2) into two independent and mutually isolated closed spaces, namely an A cavity (7) and a B cavity (8), and forming a boundary between each space and the sealant (9) to be detected; step two, during detection, filling a specific colored tracer gas with preset pressure into the communicated cavity through the first air pipe (3); Step three, if the sealant (9) is coated completely and without gaps on the surface of the bolt (11), gas permeation can be effectively blocked, and no colored gas exists in the other cavity, so that the tightness is qualified; if the coating layer of the sealant (9) has cracks, holes or incomplete coverage, colored gas in one cavity can leak to the other cavity through a defect channel under the action of pressure difference, and the sealing failure and the occurrence position thereof can be intuitively and accurately judged by observing the colored gas in the other cavity.
  10. 10. The detection method according to claim 9, wherein in the second step, before the colored gas is introduced, the micro balloon in the flexible silica gel sealing layer (5) is inflated through the second gas pipe (6), so that the flexible silica gel sealing layer (5) expands and presses the bolt, and further, the bolt completely covers the surface of the glue coating layer of the bolt (11).

Description

Device and method for detecting tightness of bolt sealant at key butt joint part of combined electrical appliance Technical Field The invention relates to the technical field of manufacturing and detection of high-voltage electrical equipment, in particular to a device and a method for detecting tightness of bolt sealant at key butt joint parts of a combined electrical appliance. Background The tightness of the bolt at the key butt joint part of the combined electrical apparatus is mainly realized by coating sealant on the surface of the bolt at present. The current coating process is mainly manual or simple mold operation, and the thickness, uniformity and integrity of the adhesive layer are difficult to precisely control. Such uneven coating can result in localized insufficient adhesion, thickness variation, etc. between the bond line and the metal flange interface, and can further form microscopic interfacial defects, such as bubbles, gaps, or areas of insufficient coverage, after curing. These interface defects can directly disrupt the seal integrity of the "bolt-sealant-flange" interface. During operation of the device, moisture and corrosive media in the external environment may invade through these microscopic channels. The invaded medium can induce swelling and aging of the sealant, and electrochemical corrosion can be generated at a metal interface, so that the surface of a bolt or a flange is rusted, and the sealing failure is further aggravated. Eventually, such interface leakage may lead to escape of insulating gas or intrusion of external moisture, seriously affecting the long-term operational reliability of the combined electrical apparatus, and risking insulation degradation or even internal failure. However, the current detection of the sealing quality of the key joint surface of the bolt, the sealant and the flange plate still lacks a reliable technical means. Because the bonding surface is positioned between the closely matched metal components, and belongs to a completely closed invisible interface, the conventional detection method is difficult to directly and effectively evaluate. The existing nondestructive detection technology, such as ultrasonic detection, has insufficient resolution on a thin soft adhesive interface, and the methods of externally smearing leak detection agents and the like can only detect edge leakage and are ineffective on penetrability defects inside the joint surface. Therefore, the quality verification of the key process link depends on experience and responsibility of gluing operators for a long time, and lacks a special method capable of objectively, rapidly, in-situ and nondestructively verifying the quality verification, so that the quality verification becomes an important technical bottleneck and potential risk source for restricting the improvement of the sealing reliability of high-voltage equipment. Disclosure of Invention Therefore, the invention provides a device and a method for detecting the sealing property of bolt sealing glue at key butt joint parts of a combined electrical appliance, which are used for solving the problems, and the device is used for realizing the visualization and the accurate positioning of microscopic leakage defects, converting tens to hundreds of micrometers into optical signals capable of being directly observed, developing a rapid detection flow adapting to site working conditions, completing single-point detection within a few minutes, forming a glue coating-detection-repair instant quality control closed loop, advancing a quality handling joint point from a final pressure test to a construction process, and improving the process reliability. The invention provides a bolt sealant tightness detection device for key butt joint parts of a combined electrical appliance, which comprises a detection cavity, wherein a partition plate is arranged in the detection cavity, the partition plate is used for dividing the inner space of the detection cavity into two parts, one part of the space is communicated with the outside through an air pipe I, a penetrating groove is formed in the bottom of the partition plate, and a flexible silica gel sealing layer is arranged in the penetrating groove. Further, the whole detection cavity is hemispherical, a cavity is formed in the detection cavity, the partition plate is vertically arranged in the middle position in the cavity, and the side wall is attached to the inner wall of the cavity. The bottom of the partition plate and the bottom of the detection cavity are in the same horizontal plane. Therefore, the tightness of the inner part of the detection cavity is ensured during use, and the detection accuracy is improved. Further, a balloon is arranged in the flexible silica gel sealing layer, an air inlet of the balloon penetrates through the flexible silica gel sealing layer to be connected with a second air pipe, and the second air pipe upwards penetrates through the partition plate to be c