JP2011100868A - Oil-leakage preventive cover for transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil-leakage preventive cover for a transformer, which improves operation efficiency by: preventing secondary oil leakage during recovery of leaking coil by storing an oil adsorbent in a container with high transparency; and facilitating detachment of the cover. <P>SOLUTION: The oil-leakage preventive cover 30 covers a flange 10 provided to an oil duct 11 connecting a transformer body 14 and a cooler 13 for cooling insulating oil to each other, and includes an upper cover 31 covering an upper half of the flange 10, a lower cover 32 covering a lower half of the flange 10, a hinge member 43 coupling both the covers to each other in an openable/closable state, a lever operation-type wall-hanging metallic lock W having a lock operation lever 45B, and the oil adsorbent 46 in the lower cover 32. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil leakage prevention cover that covers a flange portion provided in an oil guide pipe between a transformer and a cooler for insulating oil.

  Conventionally, a transformer that becomes high temperature is cooled by connecting a transformer body and an oil cooler such as a radiator that cools insulating oil by an oil guide pipe and circulating the insulating oil through the oil guide pipe. The oil guide pipe has a flange part that butts flanges formed at the end of the oil guide pipe extending from the transformer body and the end of the oil guide pipe extending from the oil cooler through a gasket for preventing oil leakage and fixed with a fastening bolt. Is provided.

  Insulation oil may gradually leak from the packing used for the flange due to factors such as aging. If a large amount of oil leaks, replacement work is performed promptly. However, in the case of oil leaks of about oil droplets, wiping cleaning with an adsorbent such as waste or winding of the adsorbent is performed as an emergency measure. . However, these operations are time consuming, and there is a concern of soil contamination due to oil leakage and the like, which is not preferable in the environment. In addition, older oil coolers may contain polychlorinated biphenyl (hereinafter referred to as “PCB”) in the insulating oil, and even with a small amount of oil leakage considering the impact on the living body and the environment. It is necessary to deal with.

  As one of the solutions, Patent Document 1 discloses a covering that covers the outer periphery of the connecting portion. For this, the outer periphery of the connecting portion is covered with a coating made of oil-resistant hard resin, and a discharge port opened at the lower end of the coating is provided. An insulating oil spill prevention cover is disclosed in which a collection container is attached through the cover.

JP 2001-338814 A

  However, in the cover described in Patent Document 1, it is necessary to remove the covering attached with the connecting bolt once in order to check the situation where the insulating oil leaks from the flange portion. Sexually bad. Also, if the insulating oil that exceeds the allowable capacity of the recovery container leaks out, or if rainwater that exceeds the allowable capacity of the recovery container infiltrates through the gap between the hard resin coating and the oil conduit, There is concern about secondary oil leaking out of the insulating oil from the container. Even if the insulating oil does not overflow from the collection container, it is very troublesome to replace and clean the cover, and the handling when removing the cover is inconvenient. Furthermore, in the form in which a discharge port is provided below the cover and the collection container is attached to the discharge port, there is a concern about oil leakage due to a dropout of the recovery container or clogging of the discharge port. It is insufficient as a preventive measure.

  The present invention has been completed based on the above circumstances, and prevents secondary oil leakage at the time of oil recovery by storing the oil adsorbent in a highly transparent container, An object of the present invention is to provide an oil leakage prevention cover for a transformer that improves the working efficiency by facilitating the removal of the cover.

  As a means for achieving the above object, the present invention is an oil leakage prevention cover that covers a flange portion provided in an oil guide pipe between a transformer body and a cooler for cooling insulation oil, and is formed of a synthetic resin. An upper cover that covers the upper half of the flange portion and has a semicircular relief opening corresponding to the outer diameter of the oil guide pipe on a pair of side walls facing each other with the flange portion interposed therebetween, and a transparent synthetic resin A pair of side wall portions formed and covering the lower half of the flange portion and facing each other with the flange portion interposed therebetween have semicircular relief openings corresponding to the outer diameter of the oil guide pipe, and are combined with the upper cover. A lower cover that covers the entirety of the flange portion by being in a closed state, a hinge member that is provided on one end side of the mating surface of the upper cover and the lower cover, and that connects the both covers so as to be openable and closable, The cover and the lower cover are provided on the opposite side of the hinge member and are operated by closing the lock operation lever to hold the covers in the closed state and opening the lock operation lever. The cover has a lock member that can be opened and rotated about the hinge member as a rotation axis, and an oil adsorbent housed in the lower cover.

  According to such a configuration, the insulating oil leaking from the connecting portion is absorbed by the oil adsorbing material accommodated in the lower cover. Even if oil droplets that exceed the allowable amount of oil adsorbent leak out, insulating oil is retained in the lower cover to prevent oil leakage to the outside of the oil leakage prevention cover. Damage can be prevented. In addition, it is possible to check the oil leakage status of the flange part and the degree of adsorption of the oil adsorbent from the outside of the lower cover without removing the oil leakage prevention cover. Since the oil adsorbent can be replaced by opening the prevention cover, periodic oil leakage status confirmation and oil adsorbent replacement work become very easy. Further, since the cover itself also serves as an insulating oil recovery container, there is no concern about clogging of the discharge port or dropping out of the recovery container.

The following configuration is desirable as an embodiment of the present invention.
Each of the upper cover and the lower cover is provided with a seal member that contacts the oil guide pipe at the opening edge of each relief opening.
With such a configuration, it is possible to prevent rainwater entering from the gap between the oil leakage prevention cover and the oil guide pipe, thereby reliably preventing secondary oil leakage, and the upper and lower covers for the oil guide pipe. It is possible to prevent the cover from being displaced after being attached to the flange portion.

The upper cover and the lower cover have a box shape in which one end having each relief opening of the side wall portion is opened, and inside the joint portion where two walls of the two covers are joined. The corners of the reinforcing material in the shape of a triangular prism having a right-angled corner are attached to the formed inner corner at a right angle along the inner corner.
With such a configuration, it is possible to reinforce the adhesion of the joining portion, and it is possible to prevent distortion of the oil leakage prevention cover that occurs when the oil leakage prevention cover is removed.

  According to the present invention, the oil adsorbent is housed in a highly transparent container to prevent secondary oil leakage during oil leakage recovery, and the cover can be easily removed to improve work efficiency. An oil leakage prevention cover for a transformer can be provided.

Configuration diagram of oil-filled transformer and cooler for insulating oil Front view of oil leak prevention cover Side view of oil leak prevention cover Side cross-sectional view of the oil leakage prevention cover with the flange covered

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows an oil-filled transformer 12 connected by an oil guide pipe 11 having a flange portion 10 to which an oil leakage prevention cover 30 according to this embodiment is applied, and a cooler 13 that cools insulating oil for the oil-filled transformer. It is a block diagram. The oil-filled transformer 12 includes an iron core 16 covered with a coil portion 15 in an insulating transformer main body 14 and is filled with insulating oil.

A transformer body 14 is provided with an insulator 17 having two large and small conical shapes on its upper surface. One end of the insulator 17 is connected to the winding 15A extending from the coil portion 15 covering the iron core 16, and the other end is connected to an external power transmission line (not shown) from the outer wall of the transformer body 14. It is insulated and supported and fixed.
The transformer main body 14 is provided with oil guide pipes 11 connected to the cooler 13 at two locations above and below the side surface thereof. Oil guide pipes 11 are provided at the locations. And the oil-filled transformer 12 and the cooler 13 are connected by abutting and fixing each oil guide pipe 11 extended from the transformer main body 14 and the cooler 13.

  The insulating oil cooled by the cooler 13 is supplied to the transformer main body 14 of the oil-filled transformer 12 through the oil guide pipe 11 attached below the transformer main body 14, and the insulating oil is heated to the coil portion 15 and After cooling the iron core 16, the iron core 16 is returned to the cooler 13 through the oil guide pipe 11 </ b> A attached above the transformer main body 14. As a result, the insulating oil circulates between the transformer body 14 and the cooler 13 of the oil-filled transformer 12 to cool the oil-filled transformer 12.

  As shown in FIG. 4, the oil guide pipe 11 includes a flange 19 formed at the end of the oil guide pipe 11 extending from the transformer main body 14 of the oil-filled transformer 12 and a flange formed at the end of the oil guide pipe 11 extending from the cooler 13. The flange part 10 which abuts 19 through the on-off valve 20 which controls the flow of insulating oil is provided. The flange portion 10 allows the fixing bolt 22 to pass from one flange 19 through the on-off valve 20 to the other flange 19 and screw the fixing bolt 22 into a fixing nut 23 paired with the fixing bolt 22. Thus, each flange 19 and the on-off valve 20 are fixed. Between each flange 19 and the on-off valve 20, a packing (not shown) for preventing leakage of insulating oil flowing in the oil guide pipe 11 is attached.

  A handle 24 is attached to the upper portion of the on-off valve 20, and the on-off valve 20 can be opened and closed by rotating the handle 24.

The flange portion 10 is provided with an oil leakage prevention cover 30 formed of a transparent synthetic resin having a flat box-like shape in front view and having a flat appearance.
The oil leakage prevention cover 30 includes an upper cover 31 and a lower cover 32. The upper cover 31 is formed in a rectangular box shape with an open bottom surface, and the lower cover 32 has an open top surface and is approximately the same size as the upper cover 31. It is formed in the shape of a rectangular box.
The cover 31, 32 has a triangular pillar-shaped reinforcing member 35 having a right-angled corner 34 at a right-angled inner corner 33 formed by joining two adjacent walls of the walls constituting the cover. The corner portion 34 is bonded by an adhesive so as to follow the inner corner portion 33.
The reinforcing material 35 is set so that both ends thereof are slightly shorter than the length of the inner corner portion 33 and the reinforcing materials 35 are not in contact with each other.

  The pair of upper longitudinal walls 36 corresponding to the side walls located in the longitudinal direction of the upper cover 31 is set at a position where the flange 10 is sandwiched between the flanges. The upper longitudinal wall 36 is formed with a semicircular upper relief opening 37 corresponding to the outer diameter of the oil guide pipe 11 which is curved and recessed from the opening edge toward the upper surface.

On the other hand, a pair of lower longitudinal walls 38 corresponding to the side wall portions located in the longitudinal direction of the lower cover 32 are curved from the opening edge of the lower cover 32 toward the lower surface in the same manner as the upper cover 31. A semicircular lower relief opening 39 corresponding to the outer diameter is formed.
The upper relief opening 37 and the lower relief opening 39 have H-shaped oil-resistant rubber seal members 40 attached to the opening edges thereof. The sealing member 40 is bonded with an adhesive by sandwiching each opening edge in one of the H-shaped recesses. In addition, the sealing member 40 is cut at equal intervals on its side, and the sealing member 40 is attached to both semicircular relief openings without any gaps by opening the cut portion in a V shape toward the outside. ing.

  The upper cover 31 covers the upper half of the flange portion 10 provided on the oil guide pipe 11 from the upper side of the flange portion 10, and the opening edge of the upper cover 31 covers the lower half of the flange portion 10 from below. It is set as the closed state which covered the flange part 10 whole completely by abutting with the opening edge of the lower cover 32 to cover. At this time, the upper relief opening 37 of the upper cover 31 and the lower relief opening 39 of the lower cover 32 sandwich the oil guide pipe 11 to attach the covers 31 and 32 to the flange portion 10.

  At the opening edge of the upper cover 31, when the upper cover 31 and the lower cover 32 are brought into a closed state by abutting one end of the upper short wall 41 positioned in the short direction of the opening edge, the upper short wall 41. A metal hinge member 43 that connects the opening edge portion of the lower short wall 42 located in the short direction of the lower cover 32 corresponding to is attached. The hinge member 43 includes a hinge piece 43A attached to the upper short wall 41, a hinge piece 43B attached to the lower short wall 42, and a rotating shaft 43C. The hinge member 43 is rotated when the oil leakage prevention cover 30 is attached or detached. Both covers are configured to be rotatable about the moving shaft 43C.

A pair of lever-operated latch-type locks W (so-called “patching”) corresponding to a lock member are provided on the other short walls 41, 42 located on the opposite side of the short walls 41, 42 to which the hinge member 43 is attached. Lock ") is attached.
A receiving bracket 44 having a hooking claw 44A which is one of a pair of snap locks W is attached to the opening edge of the upper short wall 41, and the lock lever bracket 45 which is the other snap lock is connected to the upper cover 31 and the lower cover. The cover 32 is attached to the opening edge of the lower short wall 42 corresponding to the upper short wall 41 to which the receiving metal fitting 44 is attached when the cover 32 is brought into a closed state.

The lock lever bracket 45 is closed with the hook 45A to be hooked on the hook 44A of the receiving bracket 44, pulls the hook 45A to hold both covers closed, and opens to pull the hook 45A by opening. The cover is composed of a lock operating lever 45B that opens the hinge member as a rotation shaft. Then, by closing the snap lock W, the upper cover 31 and the lower cover 32 are closed, and the oil leakage prevention cover is fixed to the flange portion 10 of the oil guide pipe 11.
An oil adsorbing mat 46 corresponding to an oil adsorbing material that adsorbs oil is accommodated in the lower cover 32 of the oil leakage preventing cover 30 fixed to the flange portion 10 to adsorb the insulating oil leaking from the flange portion 10. Can do.

According to the present embodiment, the insulating oil leaked from the flange portion 10 is absorbed by the oil adsorption mat 46 accommodated in the lower cover 32, and soil contamination due to leakage of oil leakage can be reliably prevented.
Further, since the lower cover 32 is formed of a transparent synthetic resin, it is possible to confirm the state of the insulating oil leaking from the flange portion 10 from the outside of the oil leakage prevention cover 30 without removing the oil leakage prevention cover 30. Therefore, it is very easy to perform periodic inspections and status checks. In addition, since the lower cover 32 of the oil leakage prevention cover 30 also serves as an oil leakage collection container, the amount of oil leakage exceeds the allowable amount of the oil adsorption mat 46 accommodated in the lower cover 32. However, the insulating oil does not overflow. Further, by installing a seal member 40 made of oil-resistant rubber between the oil leakage prevention cover 30 and the oil guide pipe 11, intrusion of rainwater is avoided, and the oil leak prevention cover 30 attached to the oil guide pipe 11 is provided. It is fixed so that it does not rotate by shifting. From the above, the oil leakage prevention cover according to the present invention has no fear of causing secondary oil leakage, and even if oil leakage containing PCB occurs, the oil adsorption mat 46 is treated strictly to the human body and the environment. Can prevent the influence.

  In addition, when the oil adsorption mat 46 is replaced, the upper cover 31 and the lower cover 32 can be opened very simply by opening operation that causes the lock operation lever 45B of the snap lock W, and the oil adsorption mat The replacement work can be carried out very easily.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In the present embodiment, the entire oil leakage prevention cover is formed of a transparent synthetic resin, but the present invention is not limited to such an embodiment. In the present invention, it is sufficient that the lower cover 32 is made of a transparent synthetic resin and the state in the lower cover 32 can be confirmed.
(2) In the present embodiment, the overall appearance of the oil leakage prevention cover has a flat box shape, but the present invention is not limited to such an embodiment. The present invention may have, for example, a structure having a flat cylindrical shape as a whole.
(3) In the present embodiment, the lever operation type latch-type lock is used as the lock member. However, the present invention is not limited to such a mode. The present invention is not limited as long as it can be easily opened and closed by the lock operation lever.

DESCRIPTION OF SYMBOLS 10: Flange part 11: Oil guide pipe 13: Cooler 14: Transformer main body 30: Oil leakage prevention cover 31: Upper cover 32: Lower cover 33: Inside each part 34: Corner | angular part 35: Reinforcement material 36: Upper longitudinal wall 37: Upper relief opening 38: Lower longitudinal wall 39: Lower relief opening 40: Seal member 43: Hinge member 45B: Lock operation lever 46: Oil adsorption mat W: Lever operation type latch lock

Claims (3)

An oil leakage prevention cover that covers the flange portion provided in the oil guide pipe between the transformer body and the cooler for insulating oil cooling,
An upper cover having a semicircular relief opening corresponding to the outer diameter of the oil guide pipe on a pair of side wall portions formed of synthetic resin and covering the upper half of the flange portion and facing the flange portion; A semi-circular relief opening corresponding to the outer diameter of the oil guide pipe is formed on a pair of side wall portions formed of a transparent synthetic resin and covering the lower half of the flange portion and facing the flange portion. A lower cover that covers the entirety of the flange portion by being combined with the upper cover to be in a closed state, and a hinge member that is provided on one end side of the mating surface of the upper cover and the lower cover so as to be able to open and close the covers. The upper cover and the lower cover are provided on the opposite side of the hinge member, and the lock operation lever is closed to hold both the covers in the closed state. An oil leakage prevention for a transformer having a lock member that allows the two covers to be opened and rotated about the hinge member as a rotation shaft by opening a clutch operating lever, and an oil adsorbing material housed in the lower cover cover.   2. The oil leakage prevention cover for a transformer according to claim 1, wherein the upper cover and the lower cover are provided with a seal member that contacts the oil guide pipe at an opening edge of each relief opening.   The upper cover and the lower cover are formed in a box shape in which one end having each relief opening of the side wall portion is opened, and two adjacent walls of the two covers are joined to each other. The said corner | angular part of the reinforcing material which forms the shape of a triangular prism which has a right-angled corner | angular part is attached along the said inner corner | angular part to the inner corner | angular part which forms the right angle. Oil leakage prevention cover for transformers.

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