CN110822082B - Oil leakage plugging device and method for coil equipment - Google Patents
Oil leakage plugging device and method for coil equipment Download PDFInfo
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- CN110822082B CN110822082B CN201911185356.6A CN201911185356A CN110822082B CN 110822082 B CN110822082 B CN 110822082B CN 201911185356 A CN201911185356 A CN 201911185356A CN 110822082 B CN110822082 B CN 110822082B
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- butt joint
- gasket
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/061—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with positioning means
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- Housings And Mounting Of Transformers (AREA)
Abstract
The application discloses a device and a method for plugging oil leakage of coil equipment, which comprises a butt joint base, wherein the butt joint base is provided with a through hole and a butt joint barrel communicated with the through hole, the butt joint barrel and the through hole are coaxially arranged and are fixed on the butt joint base through the end parts, one side of the butt joint base, which is far away from the butt joint barrel, is used for being jointed with the outer wall of a workpiece to be blocked, the butting cylinder is matched with a fastening piece, an annular sealing gasket is arranged between the fastening piece and the outer wall of the workpiece to be blocked, the sealing gasket is tightly pressed on the periphery of the leakage position by utilizing the fastening piece matched with the butting cylinder, thereby the discharged insulating oil can be led out into the fastener, the leaked insulating oil is prevented from flowing out from the gap between the butt joint base and the outer wall, therefore, the adhesive coated outside cannot be polluted, and the adhesive is guaranteed to be well solidified and sealed, so that the whole hinged on-line plugging efficiency and the sealing effect are effectively improved.
Description
Technical Field
The application relates to the field of electrical overhaul, in particular to a device and a method for blocking oil leakage of coil equipment.
Background
The coil devices of the power grid, such as transformers and reactors, usually use oil media to realize the insulation and cooling functions. In actual operation, due to the influences of manufacturing quality, operation and maintenance management, service environment and the like, oil leakage often occurs, the problems of the type influence the appearance of equipment and increase the operation and maintenance cost of the equipment, and the problems of insulation failure and influence the operation safety of the equipment are serious; therefore, the treatment of the oil leakage of the coil equipment becomes an important matter for the operation and maintenance management of the power transformation equipment; the conventional treatment mode is to replace damaged parts such as a sleeve, a flange and the like after the insulating oil is extracted, and inject the insulating oil into the transformer after the insulating oil is purified, so that the maintenance process is generally long in period, high in labor and material cost and difficult to meet the requirement of the current maintenance efficiency; the technical method has the advantages that the normal operation of the equipment cannot be influenced, the cost is low because the local defects of the oil leakage equipment are generally repaired, and the equipment after plugging meets the requirement of long-term service under the condition of reasonable material and process selection.
The inventor finds that although the cementing online plugging technology can overcome the problems caused by power failure maintenance, the cementing online plugging technology is inconvenient in the plugging process, insulating oil continuously seeps out in the plugging process and contacts with a cementing repair agent, so that the cementing repair agent is polluted by the leaked insulating oil, the plugging capability is reduced, and the plugging success rate is reduced; at present, in other plugging modes, for example, plasticine is plugged into an oil leakage gap, then a bonding repairing agent is smeared outside the plasticine and at the oil leakage position, and the bonding repairing agent is prevented from being polluted by insulating oil in a mode of isolating the insulating oil, but the complete filling of the oil leakage gap is difficult to achieve in the plugging of the plasticine, and a good anti-pollution effect cannot be achieved; and through applying the equipment outer wall, form the isolation region that holds the oil leak clearance and improve pressure and carry out the mode that the shutoff with equipment internal pressure is kept level, need accurate debugging atmospheric pressure, just can realize keeping apart, high efficiency demand when being difficult to satisfy salvageing.
Disclosure of Invention
The utility model aims at the defects that prior art exists, a coil class equipment oil leak plugging device and method is provided, utilize fastener cooperation butt joint section of thick bamboo to compress tightly the gasket at the leakage department periphery, thereby the insulating oil of seepage leaks can be drawn forth in the fastener, and oil absorption paper has been put to the fastener memory, the insulating oil that can guide the seepage gets into, the insulating oil of avoiding seepage flows out in the gap of butt joint base and outer wall, thereby can not produce the pollution to the binder that the outside was paintd, the good solidification of binder has been guaranteed, thereby the efficiency and the sealed effect of whole online shutoff of gluing are effectively improved.
The first purpose of this application is to provide a coil class equipment oil leak plugging device, adopts following technical scheme:
the sealing gasket is used for drawing leaked insulating oil into the fastener all around the leakage position, and oil absorption paper is arranged in the fastener and used for absorbing the insulating oil in the fastener.
Furthermore, the butt joint base is a flat plate part and is used for matching with the outer wall of a workpiece to be plugged with a flat structure, and the inner diameter of the butt joint barrel is equal to the diameter of the through hole.
Furthermore, the fastening piece is of a cylindrical structure with one end plugged, the end face of the opening end is used for being attached to and abutting against the sealing gasket, and the outer circumferential face of the fastening piece is connected with the inner circumferential face of the butting cylinder in a threaded fit mode and used for enabling the gasket to be tightly attached to the outer wall of the workpiece through rotating fastening force.
Further, the butt joint base is an arc plate and is used for matching the outer wall of a workpiece to be plugged with the same radian arc-shaped structure, and the inner diameter of the butt joint barrel is equal to that of the through hole.
Furthermore, the fastener is a tubular structure with one end plugged, a sleeve is matched inside the fastener, one end of the sleeve contacts with the fastener, the other end of the sleeve is attached to the gasket, and the fastener abuts against the gasket through the sleeve and is used for enabling the gasket to be tightly attached to the outer wall of the workpiece.
Furthermore, one end of the sleeve fitting gasket is of an arc-shaped structure matched with the outer wall of the workpiece to be plugged and used for abutting against the gasket to enable the gasket to be tightly fitted with the outer wall of the workpiece to be plugged.
Further, the fastening member is engaged with the docking barrel through a screw connection, and a rotational fastening force is applied to the gasket through the sleeve.
A second object of the present application is to provide a method for blocking oil leakage of coil equipment, which uses the oil leakage blocking device for coil equipment, and includes the following steps:
selecting an arc butt joint base or a plane butt joint base according to the shape of a leakage position of a workpiece to be blocked;
bonding the butt joint base on the outer wall of a workpiece to be blocked to enable the through hole to surround the leakage position;
if the outer wall of the workpiece is arc-shaped, the gasket is placed into the through hole through the butting cylinder, the gasket surrounds the periphery of the leakage position, one end of the sleeve is pressed against the gasket, the other end of the sleeve is pressed against the fastening piece, and the fastening piece is matched with the butting cylinder and screwed tightly;
if the outer wall of the workpiece is a plane, placing the gasket into the through hole through the butting cylinder to enable the gasket to surround the periphery of the leakage position, matching the fastening piece with the butting cylinder, and rotating the fastening piece to enable the end part of the fastening piece to be pressed against the outer wall of the workpiece to be blocked;
the insulating oil that is drained from the leak can pass all the way along the gasket into the fastener.
Furthermore, after the plugging device is installed, a bonding repair agent is coated on the plugging device, at the matching part of the plugging device and the outer wall of the workpiece and around the matching part, and after the bonding repair agent is completely cured, the whole sealing plugging work is completed.
Furthermore, the gasket is an elastic gasket and can be tightly attached to the outer wall of the workpiece to be plugged under the pressure of the fastener.
Compared with the prior art, the application has the advantages and positive effects that:
(1) when the adhesive joint is used for on-line plugging, the gasket is used for being matched with a cavity in the fastener to guide insulating oil discharged from a leakage position, so that the leakage of the insulating oil from a gap between the butt joint base and the outer wall of a workpiece is effectively avoided, the led-out insulating oil is temporarily stored in the fastener and absorbed by oil absorption paper, a bonding repairing agent coated outside can be bonded under the condition of no pollution, the butt joint gap is well sealed, and the overall plugging effect is improved;
(2) the problem that the bonding repairing agent is easily polluted by insulating oil before curing is solved by means of leading-out and temporary storage, compared with the traditional plasticine plugging, the whole leakage position can be effectively contained, the problem of incomplete plugging caused by omission of the leakage position is avoided, and the integrity and long-time effectiveness of plugging are improved; compared with an air pressure isolation type plugging mode, the air pressure in the space in the fastener does not need to be adjusted, and only the gasket needs to be fastened, so that the leakage position can be quickly and effectively sealed, the construction efficiency is improved, and the requirements of speed and tightness of oil leakage plugging of the power grid coil type equipment are met.
(3) Utilize flat panel spare and arc plate cooperation different outer wall shapes's equipment, to curved work piece outer wall, still cooperate the sleeve that has the cambered surface terminal surface, guaranteed the good laminating of gasket and work piece outer wall under the cambered surface condition, compare in the extrusion laminating that directly utilizes the fastener terminal surface, thereby can make the gasket form certain radian hoop whole and the whole laminating of work piece outer wall, effectively improved sealed effect.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural view of an occlusion device for a plane according to example 1 of the present application;
fig. 2 is a schematic structural view of an occlusion device for an arc surface according to embodiment 2 of the present application.
The device comprises a fastening bolt cap 1, a sealing ring 2, a bonding base 3, a bonding base 4, a bonding base 5, a sealing ring 6, a sleeve 7 and a fastening bolt cap.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in this application, if any, merely indicate correspondence with the directions of up, down, left and right of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and 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 therefore should not be construed as limiting the application.
The terms "mounted", "connected", "fixed", and the like in the present application should be understood broadly, and for example, the terms "mounted", "connected", and "fixed" may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described in the background art, in the prior art, in the process of operation, the insulating oil continuously seeps out and contacts the adhesive repairing agent, so that the adhesive repairing agent is polluted by the leaked insulating oil, the plugging capability is reduced, and the plugging success rate is reduced; at present, in other plugging modes, for example, plasticine is plugged into an oil leakage gap, then a bonding repairing agent is smeared outside the plasticine and at the oil leakage position, and the bonding repairing agent is prevented from being polluted by insulating oil in a mode of isolating the insulating oil, but the complete filling of the oil leakage gap is difficult to achieve in the plugging of the plasticine, and a good anti-pollution effect cannot be achieved; and through applying the equipment outer wall, form the isolation region that holds the oil leak clearance and improve the mode that pressure and equipment internal pressure kept level and carry out the shutoff, need accurate debugging atmospheric pressure, just can realize keeping apart, be difficult to satisfy the high efficiency demand when salvageing, to above-mentioned technical problem, this application has proposed a coil class equipment oil leak plugging device and method.
Example 1
In an exemplary embodiment of the present application, as shown in fig. 1, a device and a method for blocking oil leakage of coil-type equipment applied to an outer wall of a planar workpiece are provided.
The plugging device mainly comprises three parts, namely a butt joint base, a gasket and a fastener, wherein in the embodiment, the butt joint base is a bonding base 3 of a butt joint cylinder provided with a through hole and a communication through hole, the bonding base is a flat plate part and used for being attached to the plane outer wall of a workpiece to be plugged, the butt joint cylinder and the through hole are coaxially arranged and are fixed on the bonding base through end parts, the butt joint cylinder is matched with the fastener, an annular gasket is arranged between the fastener and the outer wall of the workpiece to be plugged, in the embodiment, the fastener is a cylindrical fastening bolt cap 1 with one closed end, a cavity is arranged in the fastener, insulating oil discharged from a leakage position can be received after the fastener is matched with the bonding base, the gasket is an annular sealing ring 2, the sealing ring can be abutted against the outer wall of the workpiece to be plugged under the effect of the fastening bolt cap, and the sealing ring is used for leading all the insulating oil discharged from the leakage position to the butt joint cylinder around the leakage position The butt joint cylinder is internally provided with oil absorption paper for absorbing insulating oil in the butt joint cylinder;
for the outer wall of a planar workpiece, the sealing ring needs to be flatly abutted against the outer wall of the workpiece and then compressed, therefore, the fastening bolt cap selected here is of a cylindrical structure with one end blocked, the end face of the opening end is used for being attached to the abutting sealing ring, the outer circumferential surface of the fastening bolt cap is in threaded fit connection with the inner circumferential surface of the abutting cylinder and used for enabling the sealing ring to be tightly attached to the outer wall of the workpiece through rotating fastening force, and insulating oil discharged from a leakage position can enter the abutting cylinder along the sealing ring so as to be absorbed by oil absorption paper.
In order to ensure that the insulating oil can smoothly enter the butting cylinder from the through hole, the inner diameter of the butting cylinder is configured to be equal to the diameter of the through hole, and smooth transition of the joint of the butting cylinder and the through hole is ensured.
When the online shutoff of cementing, utilize the inside cavity of gasket cooperation fastener to guide the insulating oil of leakage department discharge, effectively avoided insulating oil to ooze from the gap between butt joint base and the work piece outer wall, the insulating oil of drawing is kept in the fastener and is absorbed by oil absorption paper, makes the bonding repairing agent that the outside was paintd can bond under the circumstances that does not receive the pollution to carry out good sealing with its butt joint gap, improve holistic shutoff effect.
The plugging method performed by the plugging device comprises the following steps:
matching the bonding base with the plane of a workpiece to be blocked, and pre-bonding by using a bonding agent to enable the through hole to surround the whole leakage position;
after the binder is solidified, the support and fixation functions can be provided for the whole device, and the sealing ring is placed into the through hole through the butting cylinder, so that the gasket surrounds the periphery of the leakage position;
the fastening bolt cap is matched with the inner wall of the butt joint cylinder, the opening end of the fastening bolt cap is pressed against the sealing ring, the sealing ring is gradually pressed on the plane of the workpiece by utilizing thread matching, and insulating oil and a binder are isolated;
the insulating oil discharged from the leakage position can completely enter the fastener along the sealing ring, so that the insulating oil is absorbed by the oil absorption paper in the fastener;
and (3) coating an adhesive on the plugging device and around the matching part of the plugging device and the outer wall of the workpiece, so as to improve the plugging effect.
The problem that the bonding repairing agent is easily polluted by insulating oil before drying is solved by means of leading-out and temporary storage, compared with the traditional plasticine plugging, the whole leakage position can be effectively contained, the problem of incomplete plugging caused by omission of the leakage position is avoided, and the integrity and long-time effectiveness of plugging are improved; compared with an air pressure isolation type plugging mode, the air pressure in the space in the fastener does not need to be adjusted, and only the gasket needs to be fastened, so that the leakage position can be quickly and effectively sealed, the construction efficiency is improved, and the requirements of speed and tightness of oil leakage plugging of the power grid coil type equipment are met.
Example 2
In a typical embodiment of the present application, as shown in fig. 2, a device and a method for blocking oil leakage of coil equipment applied to an outer wall of a workpiece with a cambered surface are provided.
Different from the embodiment 1, in the embodiment, the bonding base 4 is an arc-shaped plate, the sleeve 6 is added as an intermediate fastener while the seal ring 5 is arranged between the fastening bolt cap 7 and the outer wall of the workpiece, the fastening bolt cap is a cylindrical structure with one end blocked, the sleeve is matched in the fastening bolt cap, one end of the sleeve is in contact with the fastening bolt cap, the other end of the sleeve is attached to the seal ring, and the fastening bolt cap is pressed against the seal ring through the sleeve and used for tightly attaching the seal ring to the outer wall of the workpiece;
furthermore, one end of the sleeve fitting gasket is of an arc-shaped structure matched with the outer wall of the workpiece to be plugged and is used for abutting against the sealing ring to enable the sealing ring to be tightly fitted with the outer wall of the workpiece to be plugged; the sealing ring can form a certain bending structure, and can be better attached to the outer wall of a workpiece.
Further, the fastening bolt cap is matched with the butt joint barrel through threaded connection, and rotary fastening force is exerted on the gasket through the sleeve; at this time, the fastening bolt cap does not serve as a structure for directly abutting against the sealing ring, and the connection mode between the fastening bolt cap and the butting cylinder can be freely selected, for example, the fastening bolt cap is sleeved outside the butting cylinder through an internal thread, and the fastening bolt cap can also be connected with the inner wall of the butting cylinder through an external thread as in embodiment 1.
The plugging method performed by the plugging device comprises the following steps:
matching the bonding base with the cambered surface of the workpiece to be plugged, and pre-bonding the bonding base with a bonding agent to enable the through hole to surround the whole leakage position;
after the binder is solidified, the support and fixation functions can be provided for the whole device, and the sealing ring is placed into the through hole through the butting cylinder, so that the gasket surrounds the periphery of the leakage position;
one end of the sleeve is pressed against the gasket, the other end of the sleeve is pressed against the fastening piece, the fastening piece and the butt joint cylinder are matched through threads to gradually press the sealing ring on the plane of the workpiece, and insulating oil and the adhesive are isolated;
the insulating oil discharged from the leakage position can completely enter the fastener along the sealing ring, so that the insulating oil is absorbed by the oil absorption paper in the fastener;
and (3) coating an adhesive on the plugging device and around the matching part of the plugging device and the outer wall of the workpiece, so as to improve the plugging effect.
After the cavity of the fastening bolt cap is filled with insulating oil, the insulating oil in the fastening bolt cap and the insulating oil in the original piece form balance under the sealing effect, and leakage is avoided.
The problem that the bonding repairing agent is easily polluted by insulating oil before drying is solved by utilizing the mode of leading out and temporarily storing, and for the arc-shaped workpiece outer wall, the sleeve with the cambered surface end face is matched, so that the good fitting of the gasket and the workpiece outer wall under the cambered surface condition is ensured, the gasket is compared with the extrusion fitting directly utilizing the fastener end face, thereby the gasket can be enabled to form a certain radian, the annular ring is wholly fitted with the workpiece outer wall, and the sealing effect is effectively improved.
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 (8)
1. The oil leakage plugging device for the coil equipment is characterized by comprising a butt joint base, wherein a through hole and a butt joint barrel communicated with the through hole are arranged on the butt joint base, the butt joint barrel and the through hole are coaxially arranged and are fixed on the butt joint base through end parts, one side of the butt joint base, which is far away from the butt joint barrel, is used for being attached to the outer wall of a workpiece to be plugged, a fastener is matched on the butt joint barrel, an annular sealing gasket is arranged between the fastener and the outer wall of the workpiece to be plugged, the sealing gasket is tightly pressed on the outer wall of the workpiece to be plugged under the action of the butt joint barrel, the sealing gasket is used for leading all leaked insulating oil out to the fastener around a leakage position, and oil absorption paper is arranged in the fastener and;
the butt joint base is an arc plate, the fastener is a tubular structure with one end plugged, a sleeve is matched inside the fastener, and one end of the sleeve attached to the gasket is an arc structure matched with the outer wall of the workpiece to be plugged.
2. The oil leakage blocking device for coil equipment according to claim 1, wherein the docking base is adapted to fit the outer wall of the workpiece to be blocked with the arc structure having the same radian, and the inner diameter of the docking cylinder is equal to the inner diameter of the through hole.
3. The oil leakage blocking device for coil-type equipment according to claim 2, wherein one end of the sleeve contacts the fastening piece, and the other end of the sleeve is attached to the gasket, and the fastening piece presses against the gasket through the sleeve to tightly attach the gasket to the outer wall of the workpiece.
4. The oil leakage blocking device for coil equipment according to claim 3, wherein the sleeve is used for pressing the gasket to make the gasket closely fit with the outer wall of the workpiece to be blocked.
5. The coil-type device oil leakage blocking apparatus of claim 4, wherein the fastening member is engaged with the docking barrel through a threaded connection, and a rotational fastening force is applied to the gasket through the sleeve.
6. A method for blocking oil leakage of coil equipment, which is characterized by using the oil leakage blocking device of coil equipment according to any one of claims 1-5, and comprises the following steps:
bonding the butt joint base on the outer wall of a workpiece to be blocked to enable the through hole to surround the leakage position;
and placing the gasket into the through hole through the butting cylinder, enabling the gasket to surround the periphery of the leakage position, pressing one end of the sleeve against the gasket, pressing the other end of the sleeve against the fastening piece, and screwing the fastening piece and the butting cylinder in a matched manner.
7. The method for plugging an oil leakage of coil equipment according to claim 6, wherein after the plugging device is installed, an adhesive repairing agent is coated on the plugging device, at the matching part of the plugging device and the outer wall of the workpiece and around the matching part, and the plugging is completed after the adhesive repairing agent is completely cured.
8. The method for plugging oil leakage of coil equipment according to claim 7, wherein the gasket is an elastic gasket capable of tightly adhering to the outer wall of the workpiece to be plugged under the pressure of the fastener.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911185356.6A CN110822082B (en) | 2019-11-27 | 2019-11-27 | Oil leakage plugging device and method for coil equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911185356.6A CN110822082B (en) | 2019-11-27 | 2019-11-27 | Oil leakage plugging device and method for coil equipment |
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| Publication Number | Publication Date |
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| CN110822082A CN110822082A (en) | 2020-02-21 |
| CN110822082B true CN110822082B (en) | 2021-06-22 |
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| CN201911185356.6A Active CN110822082B (en) | 2019-11-27 | 2019-11-27 | Oil leakage plugging device and method for coil equipment |
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| CN113141698B (en) * | 2021-04-19 | 2024-04-26 | 常州赛乐医疗技术有限公司 | High-pressure oil tank of X-ray machine and X-ray machine using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2425258Y (en) * | 2000-04-27 | 2001-03-28 | 天津市天然气公司 | Gas leak-stopping plate piece with pressure |
| CN104319646A (en) * | 2014-10-27 | 2015-01-28 | 国家电网公司 | Guiding, bonding and plugging type under-pressure leakage blocking device |
| CN107833728A (en) * | 2017-10-31 | 2018-03-23 | 国网山东省电力公司电力科学研究院 | Sealing structure and encapsulating method of the transformer oil filled bushing insulator with metab |
-
2019
- 2019-11-27 CN CN201911185356.6A patent/CN110822082B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2425258Y (en) * | 2000-04-27 | 2001-03-28 | 天津市天然气公司 | Gas leak-stopping plate piece with pressure |
| CN104319646A (en) * | 2014-10-27 | 2015-01-28 | 国家电网公司 | Guiding, bonding and plugging type under-pressure leakage blocking device |
| CN107833728A (en) * | 2017-10-31 | 2018-03-23 | 国网山东省电力公司电力科学研究院 | Sealing structure and encapsulating method of the transformer oil filled bushing insulator with metab |
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