JPS6111953Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an insulating spacer that is used in gas-insulated switchgear etc. that conduct large currents, and provides insulating support through the conductor through the center. It relates to an insulating spacer that has a heat dissipation effect. And the purpose of this idea is
The object of the present invention is to improve the electrically insulated heat pipe into a small, flat plate-shaped structure that is easy to manufacture.

In gas-insulated switchgear and the like, conductors that carry large currents are insulated and supported by insulating spacers. Although Joule heat is generated in the insulator, since heat transfer through the insulating gas is poor, it is necessary to cool the conductor by some means rather than relying on natural heat radiation. As a prior art in this regard, Utility Model Application No. 49-52086
The publication describes an insulating spacer having a built-in heat pipe that functions as a heat transporter.
However, in the case of this insulating spacer, the electrical insulation properties of the refrigerant sealed in the heat pipe are inferior to the constituent materials of the insulating spacer (for example, solid insulators such as porcelain or ceramics), so it is necessary to increase the insulation distance, and the conductor On the other hand, the radius dimension is large because it has to be buried at an angle, and because the heat pipe has a structure in which the pipe is placed in close contact with the inner wall surface of the pipe, only a straight pipe shape is easy to manufacture. Further, the built-in heat pipe is configured as a large conical shape inclined at a predetermined angle with respect to the conductor. However, the large-diameter, conical insulating spacer requires spacers in the radial and longitudinal directions of the conductor, which has the drawback of increasing the size of the switchgear and the like.

This invention was made for the purpose of solving the above-mentioned drawbacks of conventional insulating spacers.

To summarize this idea, an electrically insulated heat pipe with a predetermined electrically insulating length is shaped differently in the radial direction of the spacer body, and the length is such that the electrically insulated heat pipe has sufficient electrical dielectric strength. The inner end of this electrically insulated heat pipe is placed in the center of the spacer body so as to be in contact with the conductor so that it can absorb heat, and the outer end is exposed outside the outer periphery of the spacer body so that it can radiate heat. It is in the insulating spacer of the structure that is exposed.

Next, this invention will be explained by means of illustrated embodiments.

1 and 2 show an insulating spacer which is a first embodiment of this invention. In the figure, reference numeral 1 denotes a spacer body made of an electrically insulating material such as porcelain or ceramic, which is perpendicular to the center line of the conductor 2 and shaped like a disk with a tapered cross section. has. Center section of hole 1a (Fig. 2)
A heat-absorbing metal fitting 4 in contact with the conductor 2 is buried therein, and a ring-shaped flange metal fitting 3 is fixed to the outer periphery to serve as reinforcement for attachment to a switchgear or the like.
3a... are bolt holes provided in the flange metal fittings.

In the figure, 5 indicates a length that is radially located at the center of the cross section of the spacer body 1 (FIG. 2) and has a length sufficient to obtain a predetermined electrical dielectric strength, relative to the center line of the conductor 2. These are electrically insulated heat pipes buried as irregularly shaped L-shaped curves (FIG. 1) in the vertical direction. This electrically insulated heat pipe 5 is disposed such that its inner end is in contact with the conductor 2 together with the heat absorbing fitting 4 in a state where it can absorb heat, and its outer end is passed through the flange fitting 3 to the outside of the spacer body 1. The heat can be exposed in a manner that allows heat to be radiated (heat is essentially radiated through the flange fitting 3).

The details of the structure of the electrically insulated heat pipe 5 are shown enlarged in FIG. In other words, the cylindrical wick 51 made of a porous material that moves liquefied refrigerant by capillary action is reinforced with a cylindrical insulating core 50 located in its hollow part, and has a halved shape in the axial direction. Two half pipes 52 and 53 are assembled symmetrically as shown in FIG. ,
Therefore, it is possible to easily manufacture heat pipes with irregular shapes.

Both ends of the wick 51 and the electrically insulating tube are fitted and joined with end fittings 54 and 55 made of a material with good heat transfer properties,
The electrically insulating tubes 52 and 53 are hermetically and liquid-tightly sealed by brazing the joints with the end fittings 54 and 55. Then, the nozzle 5 provided on the end fitting 54
It is constructed by evacuating through 6 and then filling it with an electrically insulating refrigerant. Therefore, in the electrically insulated heat pipe 5 having this configuration, for example, when the end fitting 55 on the inner end side absorbs the Joule heat of the conductor 2,
The heat is absorbed as vaporization heat that vaporizes the liquefied refrigerant that has penetrated into the wick 51.

Next, the vaporized refrigerant gas is transferred between the wick 51 and the electrically insulating tube 5 due to the difference in specific gravity or gas pressure.
2, 53 and the other end fitting 5.
4 and transports heat. Then, as a result of heat being removed by the heat dissipation action in the other end fitting 54, the refrigerant liquefies again and returns to the wick 51.
and flows toward the end fitting 55, thereby exerting the action of continuously and forcibly moving and transporting heat in one direction.

Therefore, in this electrically insulated heat pipe 5, the end fitting 55 is in close contact with the heat absorbing fitting 4 and the conductor 2 buried in the spacer body 1 so as to be able to conduct heat (capable of absorbing heat), and the other end fitting 54 is in close contact with the heat absorbing fitting 4 and the conductor 2 embedded in the spacer body 1, and the other end fitting 54 is connected to the flange. The flange fitting 3 is in close contact with the metal fitting 3 so that heat can be transferred thereto, and heat is widely radiated to the outside through the flange fitting 3. Note that the end fitting 54 is fixed by the plugs 6, 6.

Therefore, in the insulating spacer with the above configuration,
The conductor 2 is supported by the mechanical strength of the spacer body 1, and the Joule heat generated by the conductor 2 is absorbed through the heat absorption fitting 4 and the end fitting 55, and is forcibly and continuously carried out by the electrically insulating heat pipe 5. This has the effect of causing heat to move through the end fittings 54 and the flange fittings 3 to widely radiate heat to the outside. Moreover, the electrically insulated heat pipe 5 is buried with a length that provides sufficient electrical dielectric strength, and heat is transported using an electrically insulating refrigerant, so there will be no problem with electrical insulation. There isn't.

Next, FIG. 4 shows a front view of an insulating spacer which is a second embodiment of this invention. That is, this embodiment shows an example in which electrically insulating heat pipes 5 having a length sufficient to obtain electrical dielectric strength are buried in an irregular shape curved in an S-shape in the radial direction. The other configurations of this embodiment are the same as those of the first embodiment, so common components are indicated by common reference numerals. This invention has the above configuration and has the following effects.

That is, since this invention has a configuration in which an electrically insulating heat pipe having a predetermined electrically insulating length is embedded in a non-linear and irregular shape in the spacer body, its electrical dielectric strength can be sufficiently ensured. Furthermore, the electrically insulated heat pipe does not need to be buried at an angle with respect to the conductor. Therefore, the insulating spacer can be made into a flat plate-shaped insulating spacer that is perpendicular to the center line of the conductor and has a diameter as small as possible, making it easy to manufacture. This has the effect of contributing to downsizing of the device.

In addition, this invention has the effect of efficiently transporting and cooling the electrically insulated heat pipe and eliminating various problems caused by heat generated by the conductor.

[Brief explanation of the drawing]

FIG. 1 is a front view of an insulating spacer that is the first embodiment of this invention, FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 A is a sectional view of an electrically insulated heat pipe.
FIG. 3B is a sectional view taken along the line BB in FIG. 3A, and FIG. 4 is a front view of an insulating spacer according to a second embodiment of this invention. DESCRIPTION OF SYMBOLS 1... Spacer body, 2... Conductor, 3... Flange fitting, 4... Heat absorption fitting, 5... Electrical insulation heat pipe, 51... Wick, 52, 53... Half insulating tube, 54, 55... ...End fittings.

Claims (1)

[Claims for Utility Model Registration] (1) In an insulating spacer that is supported through a conductor in the center and used in gas insulated switchgear, etc., an electrically insulated heat pipe of a predetermined electrically insulating length is inserted in the radial direction of the insulating spacer body. The electrically insulated heat pipe is embedded in a non-linear and irregular shape, and the inner end of the electrically insulated heat pipe is placed in contact with the conductor in the center of the spacer body so that it can absorb heat, and the outer end can dissipate heat to the outside of the spacer body. An insulating spacer characterized by an exposed structure. (2) The electrically insulated heat pipe has a wick in the center of an electrically insulated tube formed by combining halved tubes in the axial direction, and both ends of the electrically insulated tube and the wick are fitted with end fittings. 2. The insulating spacer according to claim 1, which is a utility model registered and has a structure in which the insulating spacer is sealed by being joined to the spacer and is sealed with an electrically insulating refrigerant.