JP2002355617A - Hermetically sealed gas seal removing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a long time is required in conventional gas seal removing work because this work is performed manually and a flange surface is scraped because the gas seal fixed to the flange surface is scraped off by a metal spatula to generate metal foreign matter. SOLUTION: The adhesive gas seal removing apparatus is equipped with a guide means attached to the outer wall of an opening part having a flange part provided to one end thereof and movable in the peripheral direction and diameter direction of the opening part, the hermetic seal material removing means attached to the guide means and removing the hermetic seal material attached to the flange provided to the opening part while moved in the peripheral direction and diameter direction of the opening part and a sheetlike seal means for closing the opening part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus used for replacing a sealing material such as a gas seal of an oil-immersed power transformer which has deteriorated over time.

[0002]

2. Description of the Related Art In an oil-immersed power transformer, there are a cooling pipe connected from a tank of a transformer main body to a cooler and a pipe connected to a conservator for absorbing thermal expansion and contraction in accordance with a temperature change of internal insulating oil. . A gas seal for ensuring oil-tightness is interposed between a connection flange portion which is a joint between the tank of the transformer main body and these pipes. Further, the connection flange portion as a joint is fastened by a bolt.
As the gas seal used here, a cheap and highly reliable cork packing is usually applied. Further, the gas seal is sandwiched between the flange portions after applying an adhesive material called red varnish in order to improve the adhesion to the flange surface, and thereafter, the connection flange portion is fastened.

FIG. 9 is a diagram showing the entire transformer. A transformer, a cooler with a cooling fan, an oil pump, and the like are connected to the transformer. FIG. 10 shows a state in which the flange on the transformer main body side and, for example, the flange of the cooling pipe are connected. In the figure, reference numeral 1 denotes a flange on a transformer main body side, 2 denotes a flange of a component (for example, a cooling pipe) connected to the transformer main body, and 3 denotes a gas seal, which seals gas. Here, for example, cork packing is used as the gas seal 3. Reference numeral 4 denotes a surface to which an adhesive (red varnish) is applied, 5 denotes insulating oil, and 6 denotes fastening bolts. Also, 42 is a transformer, 43 is a cooler with a cooling fan, and 44 is a conservator.

As shown in FIG. 9, a transformer 42 has a transformer 42 connected to a conservator 44, a cooler 43, an oil pump, and the like. If the transformer is used for a long period of time, such as more than 10 years, the cork packing is thermally deteriorated, and a deterioration phenomenon in which the repulsive force against the compressive force is reduced occurs. Under such conditions, thermal stress acting on the connection flange due to temperature changes due to environmental temperature changes and load changes,
In addition, when an external force acts on the connection flange due to an earthquake or the like, a problem may occur in which insulating oil leaks from a part of the gas seal of the connection flange.

If the insulating oil leaks from a part of the gas seal 3 at the connection flange, the gas seal 3 needs to be replaced. The replacement work of the gas seal 3 naturally involves removing the fastening bolts of the connection flange, separating the connected flange, and replacing the gas seal sandwiched between the flanges. At this time, since the contact surface between the gas seal 3 and the flange is bonded with an adhesive, the connection flange portion is separated while the gas seal 3 remains attached to the flange surface as shown in FIG. The Rukoto. Therefore, when replacing the gas seal with a new one, it is necessary to remove the old gas seal 3 attached to the flange surface. The removal of the gas seal 3 was manually performed by a worker using a metal spatula 7 as shown in FIG.

[0006]

Since the conventional gas seal replacement operation has been performed manually as described above, it takes a long time for an operator to remove the old gas seal. was there. In addition, since the gas seal 3 fixed to the flange surface is scraped off by the metal spatula 7, the flange surface is scraped and metal foreign matter is generated. There is a problem that the metallic foreign matter enters the transformer main body from an opening portion connected to the flange portion, and causes insulation failure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to reduce the time required for removing an old gas seal from a flange surface.
An object of the present invention is to prevent foreign matter generated by removing an old gas seal from being mixed into a transformer main body.

[0008]

A sealing gas seal removing device according to a first aspect of the present invention is mounted on an outer wall of an opening having a flange at one end and guides the opening so as to be movable in a circumferential direction and a radial direction of the opening. A guide means, a sealant removing means attached to the guide means, which removes a sealant attached to a flange provided in the opening while moving in a circumferential direction or a radial direction of the opening, and And a sheet-like sealing means for closing.

In the apparatus for removing a sealed gas seal according to a second aspect of the present invention, the sealing means includes a sealing means which is in close contact with the inner wall of the opening, and a sheet-like sheet having an end attached to the sealing means and covering the opening. Means and pressing means for pressing the close contact means against the inner wall of the opening.
In the sealing gas seal removing device according to the third invention, the contacting means is made of a material that can expand and contract and has a ring shape.

[0010] In the sealing gas seal removing device according to a fourth aspect of the present invention, the guide means is mounted around the opening, and is a guide rail movable in a circumferential direction of the opening and a guide movable in a radial direction of the opening. The gas seal removing means has a member, and removes the gas seal while moving in the circumferential direction and the radial direction by the guide rail and the guide member.

In the sealing gas seal removing device according to a fifth aspect of the present invention, the guide rail movable in the circumferential direction of the opening is a semicircular first rail-shaped rail capable of covering substantially half of the opening. A second rail guide member, a first rail member having a shape approximately half of an annular shape having a predetermined width, and an annular shape having a predetermined width, which are combined with the first rail member. Accordingly, the second rail member having an annular shape large enough to form one annular shape and the guide member movable in the radial direction of the opening can be moved in the circumferential direction of the opening. , Are attached to the first rail guide member and the second rail guide member.

[0012] In the sealed gas seal removing device according to a sixth aspect of the present invention, the gas seal removing means has a roller portion for scraping off the gas seal of the flange portion, and the material of the roller portion is harder than that of the gas seal. Softer than.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a configuration of a sealed gas seal removing device according to a first embodiment of the present invention. In the drawing, reference numeral 1 denotes a flange on the transformer main body side, and 3 denotes a gas seal, which seals gas. Here, for example, cork packing is used as the gas seal 3. 4 is an adhesive (red varnish)
An adhesive is applied between the flange and the gas seal 3 on the application surface, and the flange 1 provided on the transformer body side and the flange provided on a pipe for cooling or the like are tightly connected. Thereby, the piping is sealed. 7, a sealing device for sealing the opening 40 having the flange 1 at one end;
Is a gas seal cutting roller (hereinafter referred to as cutting roller),
9 is a radially slidable support device, 10 is a circumferentially slidable support device, 11 is a cover that covers the periphery of the cutting roller 8, and 12 is a suction removal port for cuttings.

Next, the operation of the present invention will be described. [First Step] Attachment of Sealing Device to Opening FIG. 2 to FIG. 4 show how to attach the sealing device to opening 40. In the figure, reference numeral 13 denotes a central axis of the sealing device 7, which is threaded at the upper end. The sealing device 7 pushes down the upper spring receiver 15 with the nut 14 and the spring 16
By pushing down the lower spring receiver 17 through the opening, the push-open mechanism 18 is spread outward. The push-opening mechanism 18 has a rubber 19 for ensuring adhesion to the inner wall of the opening.
Is provided. The rubber 19 is attached to the rubber attachment portion 18a, and the dustproof sheet 20 is attached to the rubber attachment portion 1a.
It is sandwiched between 8a and rubber 19, and is adhered to both in close contact. Since the rubber 19 has a ring shape and has elasticity, the rubber 19 can be brought into close contact with the inner wall of the opening by expanding the push-opening mechanism 18 outward. Since FIG. 8 is a cross-sectional view, only two arms of the push-open mechanism 18 are shown. However, for example, if arms are provided every 90 degrees, four places of the ring-shaped rubber 19 can be fixed. The larger the number of rubbers or the larger the area that can be fixed with rubber, the more closely the dustproof sheet 20 can be adhered. The number of rubbers 19 may be basically the same as the number of arms. If there is a gap between the arms, it is good to stop it with an adhesive tape or the like.

FIG. 2 shows a state before the sealing device is inserted into the opening. FIG. 3 shows a state in the middle of being inserted into the opening. FIG. 4 shows a state in which the push-open mechanism 18 of the sealing device 7 inserted into the opening is opened outward, and the rubber 19 is brought into close contact with the inner wall of the opening. How to attach the sealing device will be specifically described. As shown in FIGS. 2 and 3, the sealing device 7 is put into the opening, and then the nut 14 is tightened. By tightening the nut 14, the upper spring receiver 15, the spring 16, and the lower spring receiver 17 move downward.
8 can be spread outward. In this way, by spreading the push-open mechanism 18 of the sealing device 7 inserted into the opening outward, the ring-shaped rubber 19 can be brought into close contact with the inner wall of the opening and the dust-proof sheet 20 can be expanded. The dustproof sheet 20 is adhered to the inner wall of the opening by the ring-shaped rubber 19 in close contact therewith. Thereby, the opening is sealed by the dustproof sheet 20. With the dustproof sheet 20, dust generated by removing the gas seal can be prevented from dropping into the opening.

[Second Step] Installation of Circumferentially Slidable Supporting Device Next, the mounting of the circumferentially slidable supporting device 10 for moving the gas seal cutting roller 8 in the circumferential direction of the opening will be described. FIGS. 5 to 7 show how a slide rail for moving the gas seal cutting roller 8 in the circumferential direction is attached. 5 and 6 are plan views of the opening as viewed from above, and FIG. 7 is a cross-sectional view of the opening as viewed from the side. FIG. 6 shows a state in which a circumferentially slidable support device is attached around an opening having a flange at the upper end (here, for example, a neck). In the figure, reference numeral 21 denotes a slide rail for moving in the circumferential direction, and the slide rail 21 is a half circumference. 21a is a rail part, 21b is a fixing part for fixing the slide rail 21 to the pipe.
Reference numeral 22 denotes a slide rail for moving in the circumferential direction, and the slide rail 22 is a half circumference. 22a is a rail portion,
22b is a fixing part for fixing the slide rail 22 to the pipe. The slide rails 21 and 22 are annular (ring-shaped) rail portions 21 a and 2 having a predetermined width on the outer peripheral portion.
2a, and the slide rails 21 and 22 are combined to form a circular slide rail.

A method of mounting will be described. The slide rail 21 and the slide rail 22 are circumferential slide rails, and have a shape obtained by dividing a ring-shaped rail by half. The slide rail 21 and the slide rail 22 have fixed portions 21b and 22b on the inner periphery of the rail portions 21a and 22a. Here, the fixed part 2
1b and 22b are provided at positions lower than the rail portions 21a and 22a. The fixing portions 21b and 22b are provided with mounting holes 21c and 22c for fastening. The slide rail 21 and the slide rail 22 are fixed to the fixed portions 21b, 2b.
2b sandwiches the periphery of the opening (here, the outer peripheral neck),
The nut 24 is fastened to the bolt 23 using the fastening holes 21c and 22c for fastening, so that the bolt 23 is fixedly attached to the neck of the opening. By fixing the slide rails 21 and 22 to the pipe (outer periphery of the opening), the rail portions 21a and 22a form one ring-shaped rail.
Although not shown in FIGS. 5 and 6 for the sake of simplicity, the slide rails have guide protrusions 25 at the ends as shown in FIG.

[Third Step] Mounting of Radially Slidable Supporting Device The radially slidable supporting device 9 includes a member for sliding the cutting roller 8 in the radial direction of the opening and a cover for covering the periphery of the cutting roller 8. 11 is combined. The radially slidable support device 9 is attached to the flange portion 1. FIG. 8 shows a state immediately before attaching the radially slidable support device 9 to the flange portion 1. In the figure, reference numeral 11 denotes a cover, which is composed of a substantially cylindrical tube and a lid for sealing the top portion thereof. The top portion has an opening 29 corresponding to the size of the flange 1 in the radial direction. Has a function of preventing cutting powder from scattering around when the cutting roller 8 cuts and removes the cork packing 3.

A vertical support column 30 of the cutting roller 8 penetrates the top opening 29. A support spring 31 is set on the support column 30, and the support spring 31 is
And a horizontal leg 33 having a moving wheel 32. The horizontal leg 33 can move the cutting roller 8 in the radial direction by the moving wheel 32 moving the radial rail 34 in the radial direction. by this,
The position of the cutting roller 8 can be adjusted. The position can be adjusted from the horizontal direction by using the horizontal support columns 35 extending in the horizontal direction from the cutting roller 8.

The configuration of the cutting roller 8 includes a motor section 37 for rotating the roller 36 of the rotating roller section in addition to the vertical and horizontal support columns. On the other hand, the cover 11 has a suction removal port 12 on its side surface for sucking a cutting material, and has a structure capable of sucking and removing cutting powder. Further, the radially slidable support device 9 includes the circumferentially slidable support device 1.
It is rotatably attached to zero. The circumferentially slidable support device 10 is attached so as to sandwich the guide projection 25 of the radially slidable support device 9 between the support wheel 26 and the variable position wheel 28. A spring 27 is mounted between the support wheel 26 and the variable position wheel 28. By the spring 27, a force which is attracted toward the support wheel 26 acts on the variable position wheel 28 which is rotatably mounted.

[Fourth Step] FIG. 1 is a view showing a state in which a gas seal removing device is attached to a flange portion.
After the installation of the gas seal removing device of the present invention is completed,
A power source is connected to the motor unit 37, the roller 36 is rotated, and the cutting roller 8 is moved in the circumferential direction and the radial direction.
Remove the gas seal. Specifically, for example, the radial position of the roller 36 is adjusted to the outermost side of the flange portion, and the radially slidable support device 9 is rotated in the circumferential direction. The circumferentially slidable support device 10 includes support wheels 26
With the variable-position wheels 27, the rails 22a, 21a of the slide rails of the radially slidable support device 9 are sandwiched, moved in the circumferential direction, and the cutting roller 8 can be rotated in the circumferential direction. Thus, the cutting roller 8
Thereby, the gas seal of the flange portion can be scraped off and removed. When the cutting roller 8 makes one rotation, the radial position of the cutting roller 8 is moved to the opening side, and the radially slidable support device 9 is again rotated in the circumferential direction to remove the gas seal. By repeating this operation, the gas seal at the flange portion can be removed.

While the gas seal is being removed by the rotating roller 8, the cut material (removed gas seal) removed from the surface of the flange portion is collected by a suction machine connected to the suction / removal port. Prevents the spread of cuttings. When the cutting object removal is completed, the adhesive gas seal removal device (including the opening sealing device) is removed in the reverse procedure to the attachment to the flange portion. First, the radially slidable support device 9 is removed, and then the circumferentially slidable support device 10 or the opening sealing device 7 is removed. Before removing the opening sealing device 7, a vacuum cleaner or the like is used. After the cuttings around the opening are completely removed using, the opening sealing device 7 is removed so that the cuttings do not fall into the opening.

The material of the cutting roller 8 is harder than the gas seal and softer than the metal of the flange portion. There is no metal foreign matter contained in the object (cut). The cutting roller 8 is one of the constituent elements constituting the gas seal removing means.

[0024]

According to the first aspect of the present invention, the guide means is attached to the outer wall of the opening having a flange at one end and guides the opening so as to be movable in the circumferential direction and the radial direction, and is attached to the guide means. A sealing material removing means for removing a sealing material attached to a flange provided in the opening while moving in a circumferential direction or a radial direction of the opening, and a sheet-like sealing means for closing the opening. Thus, the gas seal attached to the flange portion can be removed in a short time.

According to the second aspect of the present invention, the sealing means includes: a contacting means which is in close contact with the inner wall of the opening; and a sheet-like sheet means having an end attached to the contacting means and covering the opening.
Since there is provided a pressing means for pressing the contact means against the inner wall of the opening, it is possible to prevent cuttings generated by removing the gas seal from being mixed into the opening. According to the third aspect, the sheet means can be brought into close contact with the inner wall of the opening by the ring-shaped contacting means, which is made of a stretchable material, so that foreign matter does not fall into the inside of the opening. Can be.

According to the fourth aspect, the guide means has a guide rail attached around the opening and movable in a circumferential direction of the opening and a guide member movable in a radial direction of the opening. The gas seal removing means removes the gas seal while moving in the circumferential direction and the radial direction by the guide rail and the guide member, so that the gas seal attached to the flange portion can be efficiently and quickly processed. it can.

According to the fifth aspect of the present invention, the guide rail movable in the circumferential direction of the opening has a first rail member having a shape approximately half of an annular shape having a predetermined width, and a guide rail having a predetermined width. A second rail member having an annular shape large enough to form a single ring by combining with the first rail member, and a radially movable opening. The guide member is attached to the first rail guide member and the second rail guide member so as to be movable in the circumferential direction of the opening.
Alternatively, the gas seal can be freely moved in the radial direction, and the gas seal can be removed in a short time.

According to the sixth aspect of the present invention, the gas seal removing means has a roller for scraping the gas seal of the flange, and the material of the roller is harder than the gas seal and softer than the flange. When the gas seal is removed, the flange portion is not scraped off, and the scraped one does not contain metal foreign matter.

[Brief description of the drawings]

FIG. 1 is a diagram showing an adhesive gas seal removing device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a state in which a sealing device according to an embodiment of the present invention is attached.

FIG. 3 is a diagram showing a state in which a sealing device according to an embodiment of the present invention is attached.

FIG. 4 is a view showing a state where a sealing device according to an embodiment of the present invention is attached to an opening.

FIG. 5 is a diagram showing a state in which a circumferentially slidable support device according to an embodiment of the present invention is attached.

FIG. 6 is a diagram showing a state where a circumferentially slidable support device according to an embodiment of the present invention is attached.

FIG. 7 is a cross-sectional view in a state where a sealing device and a circumferentially slidable support device according to an embodiment of the present invention are attached.

FIG. 8 is a diagram showing a state in which a radial slide device according to an embodiment of the present invention is attached.

FIG. 9 is a diagram showing the entire transformer.

FIG. 10 is a diagram showing connection of pipes.

FIG. 11 is a view showing a state where a pipe is disassembled.

FIG. 12 is a diagram showing a conventional gas seal removal procedure.

[Explanation of symbols]

Reference Signs List 1 flange, 7 sealing device, 8 gas seal cutting roller, 9 slidable support device in radial direction, 1
0 Circumferentially slidable support device.

Claims (6)

[Claims] 1. A guide means attached to the outer wall of an opening having a flange at one end thereof for guiding the opening movably in the circumferential direction and the radial direction; Alternatively, a seal comprising: a sealant removing means for removing a sealant attached to a flange provided in an opening while moving in a radial direction; and a sheet-like sealing means for closing the opening. Gas seal removal device. 2. A sealing means comprising: a contacting means for closely contacting an inner wall of an opening; a sheet-like sheet means having an end attached to the contacting means and covering the opening; 2. A device for removing a hermetically sealed gas seal according to claim 1, further comprising a pressing means for pressing the sealing gas seal. 3. The sealing gas seal removing device according to claim 2, wherein the contacting means is made of a material that can expand and contract, and has a ring shape. 4. The guide means is provided around the opening, and has a guide rail movable in a circumferential direction of the opening and a guide member movable in a radial direction of the opening. The sealing gas seal removing device according to any one of claims 1 to 3, wherein the gas seal is removed while being moved in the circumferential direction and the radial direction by the guide rail and the guide member. 5. The guide rail movable in the circumferential direction of the opening is a first rail member having a shape approximately half of a ring having a predetermined width, and a ring having a predetermined width. An annular second rail member having a size capable of forming one annular ring by being combined with the first rail member, and a guide member movable in the radial direction of the opening, 5. The sealing gas seal removing device according to claim 4, wherein the sealing device is mounted on the first rail guide member and the second rail guide member so as to be movable in the circumferential direction. 6. The gas seal removing means has a roller portion for scraping the gas seal of the flange portion, and the material of the roller portion is harder than the gas seal and softer than the flange portion. The sealed gas seal removing device as described in the above.