JP3129183B2 - Static electromagnetic induction equipment with heat pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stationary electromagnetic induction device with a heat pipe electrically insulated by a fluid such as an oil-immersed transformer or a gas-insulated transformer.

[0002]

2. Description of the Related Art Hitherto, the size of a stationary electromagnetic induction device such as an oil-immersed transformer has been determined by a rise in temperature, and ribs and the like have been provided on the case of the transformer to improve heat radiation. Also, application of a heat pipe having good heat transport performance to a transformer has been studied, but it has not yet been put to practical use.

When a conventional heat pipe is mounted on a case such as a transformer, a through hole 103 slightly larger than the diameter of the heat pipe 102 is provided in the case 101 as shown in FIG. Are inserted into the through holes from the side where they are not provided, and are fixed at predetermined positions with an adhesive 104. The adhesive 104 serves as a seal as well as being fixed. Further, as described in Japanese Utility Model Publication No. 63-14410 shown in FIG. 8, a heat radiating portion is formed after the heat pipe 106 provided with the heat collecting plate 105 along the coil of the transformer.

[0004]

However, in the seal having the configuration shown in FIG. 7, the heat cycle is applied to the transformer due to the load fluctuation, so that it is difficult to maintain the hermeticity for a long time.

In the type in which the heat collecting portion is fixed around the coil as shown in FIG. 8 and the heat radiating portion is retrofitted, the heat radiating portion must always be removed and attached when the case lid is closed, such as during maintenance and inspection of a transformer. Therefore, even if the configuration shown in FIG. 7 is adopted, it is considered that the worker and the working environment are not sufficient, and problems such as sealing performance and man-hours occur, which is not practical. Further, since the number of manufacturing steps is increased, it is difficult to use as many heat pipes as the generated heat is sufficiently radiated only by the heat pipes.

[0006] The present invention solves the above problems,
The reliable sealed structure is small in size, can be implemented with simple work and short man-hours, and as a result, it is possible to use a large number of heat pipes. It is to make it smaller.

Further, during maintenance of the transformer, the lid, which is a part of the case, can be easily attached and detached, so that on-site work is also facilitated.

[0008]

In order to achieve the above object, a first means of the present invention is to provide an O-ring for sealing a case mounting portion of a heat pipe provided with a heat collecting fin on one side and a heat dissipating fin on the other side. , An O-ring fixture, and a fixture attachment member for attaching the O-ring fixture to the case, and the heat collecting fins of the heat pipe are hermetically sealed in the case.

According to a second aspect of the present invention, in addition to the first aspect, a heat pipe mounting plate on which a heat pipe is sealed and mounted is formed as a part of a case.

Next, the third means of the present invention has elasticity and the inner diameter before sealing is smaller than the outer diameter of the heat pipe.

Next, a fourth means of the present invention uses an O-ring fixing member and a fixing member / fixing member which also serves as a fixing member for attaching the O-ring fixing member to the case.

Next, the fifth means of the present invention is that the heat pipe fixing member or the fixing device mounting member of the heat pipe is fixed to the case with stud bolts which do not penetrate the case.

According to a sixth aspect of the present invention, a heat pipe seal is provided inside a sealed case of a device.

Next, a seventh means of the present invention provides a heat pipe assembly having a plurality of heat pipes, a plurality of O-rings, a plurality of O-ring fixtures, and the O-ring fixtures collectively. It is sealed by a fixture attaching member attached to the case.

Further, an eighth means of the present invention provides a heat pipe assembly having a plurality of heat pipes, a plurality of O-rings, and a fixing tool / fixing means for fixing the O-rings collectively and attaching to a case. Sealed by a member.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first means of the present invention has the function of reliably sealing the gap between a case such as a heat pipe and an oil-immersed transformer with a simple structure such as an O-ring. Further, the second means of the present invention forms a heat pipe mounting plate and is easy to handle at the time of maintenance by constituting as a part of the case of the equipment. The use of the heat pipe mounting plate described above has an effect that can be easily dealt with.

Next, the third means of the present invention is that, when an O-ring is used, the necessary seal portions are between the O-ring and the case and between the O-ring and the heat pipe. It is easy to adjust by tightening, but the latter tends to be hard to adjust because it is not visible from the outside. However, by using an O-ring having elasticity with an inner diameter smaller than the outer diameter of the heat pipe and assembling the O-ring with the O-ring having a close contact with the heat pipe, an O-ring is obtained.
The sealing effect between the O-ring and the heat pipe can be reliably realized by reducing the influence of the tightening of the ring fixture, and the operation is simplified because the O-ring is fixed to the heat pipe during assembly.

Next, the fourth means of the present invention is to reduce the number of assembling steps by using an O-ring fixing tool and a fixing / fixing mounting member which also serves as a mounting portion of the O-ring fixing tool to the case. By using a metal plate or a metal plate processed by a die, it is possible to reduce the size of the seal portion, and it is easy to mass-produce compared to the flange type and has the effect of being inexpensive.

The fifth means of the present invention is that the O-ring fixture is attached without providing a through hole in the case such as welding a stud bolt, so that an O-ring for a screw is not required, and the sealing of the threaded portion is not required. Has an unnecessary action.

Next, the sixth means of the present invention is to seal the heat pipe inside a sealed case,
Since the heat collection efficiency between the oil surface and the case is poor and an ineffective portion that does not serve as a heat collection portion of the heat pipe is used, the heat pipe does not affect the shape or the case of the heat pipe.

Next, the seventh means of the present invention is to mount a plurality of O-rings and a plurality of O-ring fixtures collectively on a case when a plurality of heat pipes are used. It is easy and can be fixed uniformly and has the effect of reducing the number of work steps.

In the eighth means of the present invention, when a plurality of heat pipes are used, a plurality of O-rings can be fixed collectively, and the fixing can be performed uniformly by using a fixing member / fixing member which is attached to a case. At the same time, as in the case where the O-ring fixing device and the O-ring fixing device are also mounted on the case, the number of working steps can be greatly reduced and the cost can be reduced.

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 (a) and 1 (b).

1 (a) and 1 (b), 1 is a heat pipe, 2 is a press-fit radiating fin made of copper, aluminum, or the like, 3 is a heat collecting fin made of copper, aluminum, or the like,
4 is a case of the device, 4a is a lid which is a part of the case 4, 5
Is an O-ring made of a thermosetting material such as nitrile rubber, fluorine rubber or acrylic rubber or a thermoplastic material such as vinyl chloride rubber or thermoplastic elastomer; 6 is an O-ring fixing tool made of iron, brass, stainless steel, etc .; Fixture mounting member, 8 is a stud bolt, 9 is a transformer main body, 10 is a cooling fan for the heat pipe 1, 11 is an electrical insulating oil made of mineral oil, 12 is glass for an electrode, and 13 is a lid 4a provided on a case. A fixing bracket 14 is a fixing bolt thereof, and 15 is a rubber packing made of a thermosetting material such as nitrile rubber, fluorine rubber, or acrylic rubber or a thermoplastic material such as vinyl chloride rubber or thermoplastic elastomer. The material of the O-ring 5 and the rubber packing 15 is preferably selected in consideration of heat resistance, oil resistance, and corrosion with a contact metal. Normally, the heat pipe is attached by passing the heat pipe 1 through a through-hole slightly larger than the outer diameter of the heat pipe 1 provided in the lid 4a of the case 4 to produce a seal. Fix by press-fitting or heat conductive adhesive. Also, the O-ring fixture 6 and the fixture attachment member 7 may be a resin molded product such as an epoxy resin. The seal of the lid 4a of the case 4 has a structure that has been used in the past, and is attached to the lid 4a via the rubber packing 15 with the bolt 14 and the fixture 13 to seal the lid 4a. Further, the O-ring 5 is used, and the parts requiring sealing are the O-ring 5 and the case 4.
And the contact between the O-ring 5 and the heat pipe 1. The O-ring 5 and the O-ring fixture 6 are fastened to the stud bolt 8 of the lid 4 a via the fixture attachment member 7 to seal. There may be either a design with a gap or a design without a gap between the O-ring fixture 6 and the lid 4a. However, a design without a gap does not have to make the fastening force a problem.

The O-ring 5 has elasticity, and its inner diameter is smaller than the outer diameter of the heat pipe 1. For example, nitrile rubber, fluorine rubber or acrylic having a hardness of 40 to 80 with respect to the outer diameter of the heat pipe is 15.88 mm. Rubber O
Using a ring with an inner diameter of 14.5 to 15.7 mm,
As shown in FIG. 2, the heat pipe 1 can be assembled with the adhesiveness being given in advance. For this reason, the influence of the fastening of the O-ring fixture 6 is reduced, and the contact Y between the O-ring 5 and the heat pipe 1 can be reliably sealed. Further, since the O-ring 5 is fixed to the heat pipe 1 without slipping during assembly, the operation is simplified. In the first embodiment, the heat pipe fixing member 6 and the fixing member attaching member 7 are formed separately, but may be formed integrally as shown in FIG. That is, the fixture / fixing member 24 in which the heat pipe fitting 6 and the fixture attaching member 7 are integrated, the O-ring 5 is fixed by the tapered portion 25, and the attaching hole 26 is inserted into the stud bolt 8 of the lid 4 a of the case 4. And attach it. In addition, the fixing member / mounting member 24 may be made of metal such as iron or brass, or may be made of epoxy resin or the like.

FIG. 4 is a perspective view of another fixing device / fixing member 27. The fixing device / fixing member 27 has a tapered portion 28 which is
The ring 5 is fixed, and attached to the case with the attachment hole 29.
The fixture 27 may also be processed with a metal plate such as iron or brass, or may be formed with an epoxy resin or the like. In particular, a metal plate formed of a metal plate having a thickness of 1.2 to 3.2 mm, such as an iron plate or a stainless steel plate, formed by a metal mold and the fixing device / mounting member 24 is inexpensive and strong, and thus can be thinned and downsized. .

(Embodiment 2) Hereinafter, Embodiment 2 of the present invention will be described with reference to FIGS. 5 (a) and 5 (b).

5 (a) and 5 (b), two heat pipes 16 having a common heat radiating portion 17 are sealed with an O-ring and attached to a heat pipe attaching plate 18, and a case 1 is provided.
9 is attached to a receiving portion 20 provided in the same. That is, the heat pipe mounting plate 18 is sealed and mounted on the stud bolt 23 of the fixture 22 via the rubber packing 21.

Further, the heat pipe mounting plate 18 is standardized,
If the number of heat pipes 16 is adjusted in accordance with the amount of heat radiation, the model can be easily adapted.

Embodiment 3 Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 6 is a partial cross-sectional view in the case where there are six heat pipes in two rows.
The O-ring 34 is fixed to the O-ring 34 by six recesses 33 of the fixture / mounting member 32, and is attached via stud bolts 35 arranged so as not to penetrate inside the case lid 30. As described above, in the third embodiment, since the area of the seal can be reduced, the heat pipes 31 can be arranged close to each other, and the stud bolts 35 of the case can be greatly reduced with respect to the number of the heat pipes 31. There are advantages.

In order to provide the stud bolt 35 so as not to penetrate the lid 30, a small metal member is welded, or a member made of another material is fixed with an adhesive, so that the stud bolt 35 can be easily realized other than the stud bolt 35. it can.

Further, although the O-ring 5 is fixed by the tapered portion, the sealing can be similarly performed in a case of another structure or a case where a plurality of O-rings are used to seal one place.

[0033]

As described above, according to the first means of the present invention, the heat pipe can be securely sealed using the O-ring on the lid of the case, and can withstand the heat cycle due to the load fluctuation of the equipment. This has the advantage that the hermeticity of the period is maintained.

Further, according to the second means of the present invention, it is easy to mount the heat pipe by using a part of the case of the equipment as the heat pipe mounting plate, and the opening and closing of the heat pipe mounting plate during maintenance of the equipment. Is simple, and has the advantage that it can be carried out sufficiently in a normal worker or working environment.

Further, according to the third means of the present invention, by using an O-ring having elasticity and an inner diameter smaller than the diameter of the heat pipe, the sealing between the O-ring and the heat pipe is ensured, and the O-ring is inserted into the heat pipe. Since the O-ring does not easily fall, the workability is good, and it is not necessary to consider the orientation of the O-ring at the time of work, and there is an advantage that a plurality of O-rings can be easily handled.

Further, according to the fourth means of the present invention, since the fixing member also serves as a fixture for the heat pipe, the members to be used and the manufacturing method are simple and the number of man-hours is small. This has the advantage that sealing can be performed at low cost.

Further, according to the fifth means of the present invention, the stud bolt seal is secured by fixing the heat pipe fixing member or the fixing device mounting member to the case with the stud bolt not penetrating the case. This has the advantage that it becomes unnecessary.

Further, according to the sixth aspect of the present invention, since the upper portion inside the case is a space, there is an advantage that the size can be reduced without requiring a special space for sealing.

Further, according to the seventh aspect of the present invention, since a small number of fixture mounting members are required for a plurality of heat pipes and O-ring fixtures, the number of steps and material costs can be reduced, and uniform fixing can be achieved. It has.

Further, according to the eighth means of the present invention, the same effects as those of the above-mentioned seventh means are obtained, and the degree of the effects is even greater.

[Brief description of the drawings]

1A is a partial cross-sectional view of a stationary electromagnetic induction with a heat pipe according to Embodiment 1 of the present invention. FIG. 1B is an enlarged cross-sectional view of a portion A in FIG. 1A.

FIG. 2 is a partially enlarged cross-sectional view in which the O-ring is inserted into a heat pipe.

FIG. 3 is a perspective view of another fixing / combination mounting member.

FIG. 4 is a perspective view of still another fixing device / mounting member.

FIG. 5A is a perspective view showing a heat pipe mounting plate according to the second embodiment. FIG. 5B is a perspective view of a receiving portion of a case shown in FIG. 5A.

FIG. 6 is a partial cross-sectional view when applied to a plurality of heat pipes according to the third embodiment.

FIG. 7 is a partial sectional view showing a state where a conventional heat pipe is attached to a case.

FIG. 8 is a perspective view showing a heat collecting plate of a conventional heat pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 16, 31 Heat pipe 2 Heat radiating fin 3, 106 Heat collecting fin 4 Case 4a Cover 5, 34 O-ring 6 O-ring fixture 7 Fixing fixture 17 Radiator 18 Heat pipe attaching plate 24, 27, 32 Fixing Dual-purpose mounting member

Continued on the front page (72) Inventor Yoshiji Kagohara 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) H01F 27/18

Claims (8)

(57) [Claims] 1. A heat pipe provided with a heat collecting fin on one side and a heat dissipating fin on the other side is sealed with an O-ring, an O-ring fixture, and a fixture attachment for attaching the O-ring fixture to the case. A stationary electromagnetic induction device with a heat pipe, comprising: a heat collecting fin of the heat pipe in a case of the device; 2. A stationary electromagnetic induction device with a heat pipe according to claim 1, wherein a heat pipe mounting plate on which the heat pipe is sealed is used as a part of a case of the device. 3. An O-ring having elasticity and having an inner diameter before sealing smaller than an outer diameter of the heat pipe.
A stationary electromagnetic induction device with a heat pipe as described. 4. The fixing device according to claim 1, wherein a fixing member for the O-ring at the case-mounting portion of the heat pipe and a fixing device-cum-fixing member serving also as a portion for attaching the O-ring fixing device to the case are used. A stationary electromagnetic induction device with a heat pipe as described in the item. 5. A stationary device with a heat pipe according to claim 1, wherein the heat pipe is fixed to the case with a fixing member mounting member or a fixing and fixing member and a stud bolt not penetrating the case. Type electromagnetic induction equipment. 6. A stationary electromagnetic induction device with a heat pipe according to claim 1, wherein a seal of the heat pipe is disposed inside a case of the sealed device. 7. A heat pipe assembly having a plurality of heat pipes, a plurality of O-rings, a plurality of O-ring fixtures, and a fixture attaching member for attaching the O-ring fixtures to a case collectively. Claims 1, 2, 3,
7. A stationary electromagnetic induction device with a heat pipe according to 5 or 6. 8. A heat pipe assembly having a plurality of heat pipes, a plurality of O-rings, and the O-rings are collectively fixed and sealed by a fixing / fixing attachment member attached to a case. 7. A stationary electromagnetic induction device with a heat pipe according to 3, 5, or 6.