JPH0661066A - Cooling structure of electric apparatus - Google Patents

Abstract

PURPOSE:To realize structure wherein a spraying equipment for spraying refrigerant in a tank can be easily taken in and out from outside the tank, and the refrigerant can be directly sprayed against the winding shadowed by an iron core. CONSTITUTION:A spraying equipment 40 consists of a rectilinear liquid guide tube 50 for introducing liquid state refrigerant into a tank 12, and nozzles 60 which are buried in the liquid guide tube 50 and spray the liquid state refrigerant against the inside of the tank 12. A plurality of the nozzles 60 are arranged in the axial direction of the liquid guide tube 50. The one end of the liquid guide tube 50 is detachably fixed on the tank wall via a flange 9. The spraying equipment 40 is interposed between cores of an electric apparatus main body, and the nozzles 60 are arranged so as to face the winding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for cooling by a latent heat of vaporization of a cooling medium of an electric device such as a static induction electric device and a semiconductor converter.

[0002]

2. Description of the Related Art FIG. 13 is a principle diagram for explaining a cooling structure for electric equipment. The electric device main body 11 as a heating element is housed in a sealed tank 12, and SF ₆ is stored in the tank 12.
Insulating gas such as gas is enclosed. A condenser 13 that communicates with the internal space of the tank 12 is disposed on the side surface of the tank 12, and a liquid reservoir 16 that stores the liquefied cooling medium 14 is disposed at the bottom of the tank 12. Tank 12
A sprayer 19 is disposed inside the sprayer 19, and a liquid supply pipe 18 is connected to the sprayer 19. A liquid feed pump 17 and a filter 15 for filtering the cooling medium 14 are interposed in the liquid feeding pipe 18, and guide the cooling medium 14 in the direction of arrow 14A of the flow.

A sprayer 19 atomizes the cooling medium 14 and sprays it into the tank 12. The cooling medium 14 becomes a mist 14B having a fine particle diameter and fills the internal space of the tank 12 together with the insulating gas. The mist-like cooling medium 14 touches the electric device body 11 to remove the latent heat of vaporization, thereby cooling the electric device body 11. Evaporated cooling medium 14 enters condenser 13 as stream 14C. The cooling medium 14 cooled and liquefied by the condenser 13C becomes a flow 14D by gravity and enters the liquid reservoir 16.

The cooling medium 14 is used to make the electrical equipment nonflammable.
For example, non-combustible fluorocarbon (C
₆ F ₁₈ ) is used. Fluorocarbon is a liquid which is quite expensive at present, so if the tank 12 is filled with the cooling medium 14 and the entire electric device 11 is immersed in the liquid, it becomes a very expensive device. Therefore, as shown in FIG. 13, the cooling medium 1
By atomizing 4 and spraying it on the electric device body 11 and circulating it, the amount of the required cooling medium 14 can be reduced. The fog 14B can be suspended in the internal space of the tank 12 for a long time in the form of liquid droplets by setting the particle diameter of the fog 14B to several hundreds μm or less. Therefore, the fog 14B can be filled in every corner of the tank 12, and the evaporation latent heat is taken from the electric device body 11.

FIG. 14 is a partially fragmented perspective view showing an example of a conventional cooling structure of an electric device using such a cooling medium. Inside a tank 12 shown by being crushed, an electric device body 3 composed of a winding wire 2 around a central leg of an iron core 1 is housed. The tank 12 is filled with SF ₆ gas, and the sprayer 4 is arranged therein. The two liquid supply pipes 18 penetrate the tank 12 in an airtight manner, and each of the sprayers 4
It is connected to the. Each sprayer 4 is branched into three liquid guiding pipes 5, and three nozzles 6 are connected in the middle of each liquid guiding pipe 5. The liquid reservoir, the condenser, and the liquid feed pump are not shown.

Since the winding 2 has a high voltage, the sprayer 4 is entirely made of an insulating material for insulation. That is, the liquid guiding pipe 5 is piped by an insulating pipe, an insulating L-shaped joint, a T-shaped joint, etc., and the nozzle 6 is an insulating one-fluid nozzle (which sprays mist by applying pressure to the liquid). It is screwed into the insulating pipe of the liquid pipe 5. The nozzles 6 are all oriented towards the winding 2. Fog in the tank 12
Although it floats inside, the cooling efficiency will be better if the flow of mist ejected from the nozzle 6 is directly applied to the winding 2, which is a heating element, as much as possible. Therefore, a plurality of nozzles 6 are provided,
It is arranged so as to wrap around the winding 2.

[0007]

However, it is difficult to inspect or replace the atomizer in the conventional device as described above. That is, since the liquid guide pipe of the sprayer is branched into a large number in the tank, the tank must be opened when the nozzle needs to be inspected or replaced, which requires a large-scale work. The nozzle of the atomizer is the most important component in terms of cooling that atomizes the cooling medium. If this nozzle is clogged or damaged, the cooling efficiency of the main body of the electric device decreases. Therefore, the sprayer should be constructed so that it can be easily attached and removed from the outside of the tank so that maintenance and inspection can be performed easily.

Further, in the conventional atomizer, there is also a problem that the mist of the cooling medium cannot be directly blown to the winding portion shaded by the iron core. It is an object of the present invention to have a structure in which a sprayer can be easily taken in and out from the outside of a tank, and also to allow a cooling medium to be directly sprayed to a portion of a winding shaded by an iron core.

[0009]

In order to achieve the above object, according to the present invention, a tank accommodating an electric device body together with an insulating gas, and an insulating sprayer for spraying a liquid cooling medium into the tank. And a condenser for liquefying the cooling medium vaporized by the heat of the electric equipment body, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed for sending the cooling medium accumulated in the liquid reservoir to the sprayer. A pump for cooling the electric device main body by latent heat of vaporization of the cooling medium, wherein the sprayer is a linear conduit for guiding the liquid cooling medium into the tank, and is embedded in the conduit. It is composed of a nozzle for spraying a liquid cooling medium into the tank. The nozzles are arranged side by side in the axial direction of the liquid guiding tube, and one end of the liquid guiding tube can be attached to and detached from the tank wall via a flange. It shall become fixed, in such a configuration, the shape of the cross-section periphery of the liquid guiding tube is assumed to be rectangular.

Further, the present invention is for implementing the above-mentioned structure in an electric device having a winding wire and an iron core, wherein the iron core is divided through an iron core gap, and an atomizer is interposed in the iron core gap. It is assumed that

[0011]

According to the structure of the present invention, the atomizer comprises a straight liquid guiding pipe for guiding the liquid cooling medium into the tank, and a nozzle embedded in the liquid guiding pipe for spraying the liquid cooling medium into the tank. A plurality of these nozzles are arranged side by side in the axial direction of the liquid guiding tube, and one end of the liquid guiding tube is detachably fixed to the tank wall via the flange. In this structure, since the sprayer is straight, it can be easily taken in and out from the outside of the tank, and the maintenance and inspection of the nozzle becomes easy.

Further, since the liquid guide tube has a rectangular cross-section outer peripheral shape, the liquid guide tube can be easily sandwiched by the insulator and the iron core constituting the main body of the electric device, and the sprayer can be easily supported. Become. Further, the iron core of the electric device body was divided through the iron core gap, and the atomizer was interposed in the iron core gap. With this configuration, by directing the nozzle toward the winding side, the cooling medium can be directly sprayed to the portion of the winding shaded by the iron core.

[0013]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a sectional view showing the structure of a sprayer according to an embodiment of the present invention. The sprayer 40 is composed of a liquid guiding tube 50 formed of an insulating cylinder and a plurality of insulating nozzles 60 embedded in the liquid guiding tube 50. The liquid conducting pipe 50 has a liquid conducting hole 7
Is opened and communicates with each nozzle 60. The liquid guide tube 50 is bolted to the flange 9 via the mounting member 8. Further, the flange 9 is bolted to the tank 12 and the sprayer 40 is installed on the tank interior 12A side. A threaded portion 50B is provided on the flange 9 side of the liquid guide tube 50, and is fitted into the threaded portion of the mounting member 8. The flange 9 is provided with a screw hole 9A, and the liquid supply pipe 18 is hermetically connected to the flange 9 through the screw hole 9A.

FIG. 2 is a sectional view taken along line XX of FIG. The nozzle 60 is fitted with the screw in the hollowed hole 50A of the liquid guiding tube 50 via the threaded portion 60A. FIG. 3 is a view on arrow P of FIG. The nozzle 60 is provided with a cutout portion 60B,
A gap is formed between the hole 50A and the nozzle 60A. A jig is inserted into the gap of the notch portion 60B and rotated to embed and fix the nozzle 60 in the liquid guide tube 50. FIG. 4 is a sectional view taken along line YY of FIG. Nozzle 6
In No. 0, the cooling medium is once made to flow into the circular shell-shaped gap 60C, the flow is directed to the axial center at the exit end of the nozzle 60, and the flow is brought into colliding collision to form a mist having a particle size of several hundred μm or less. The nozzle 60 having such a mechanism is generally known as a one-fluid nozzle.

Returning to FIG. 1, the liquid cooling medium sent from the liquid sending pipe 18 under pressure is supplied from each nozzle 60 to the inside 1 of the tank.
Sprayed on 2A. The sprayer 40 has a linear shape and the flange 9
By attaching and detaching the bolts to and from the tank 12, the sprayer 40 can be easily taken in and out from the outside of the tank 12.
Furthermore, since the nozzle 60 does not protrude from the outer diameter of the liquid guide tube 50, there is an advantage that it can be inserted into a slight gap in the main body of the electric device. Therefore, it is possible to easily dispose the sprayer 40 in the vicinity of the heating element, and it is possible to enhance the cooling efficiency of the electric device by directly spraying the cooling medium onto the heating element.

FIG. 5 is a sectional view showing the structure of a sprayer according to another embodiment of the present invention. Nozzle 6 of atomizer 41
The tip of No. 1 slightly projects from the outside of the liquid guiding tube 51. The other structure is the same as that of FIG. Even if the nozzle 61 slightly projects from the liquid guiding tube 51, the sprayer 41 can be taken in and out from the outside of the tank 12 as long as the outer diameter of the sprayer 41 is smaller than the inner diameter of the flange opening 12B of the tank 12.

FIG. 6 is a sectional view showing the structure of a sprayer according to a further different embodiment of the present invention. The plurality of nozzles 62 embedded in the liquid guide tube 52 of the sprayer 42 are 180 degrees apart from each other.
It is directed in different directions. With this configuration, the atomizer 42 can eject the mist of the cooling medium in two directions. In FIG. 6, the nozzles 62 are arranged in directions different from each other by 180 degrees, but the angle at which the nozzles 62 are directed can be arbitrarily selected depending on the position where the heating element is present.

FIG. 7 is a sectional view showing the structure of a sprayer according to another embodiment of the present invention, and FIG. 8 is Z of FIG.
It is a -Z sectional view. The shape of the liquid guide tube 53 of the sprayer 43 is
The portion 53A of the mounting member 8 has a cylindrical shape, but most of the other portion 53B has a prismatic shape as shown in FIG. Since the sprayer 43 has a rectangular cross section, the sprayer 43 can be easily sandwiched by an insulator or an iron core forming the main body of the electric device, and the sprayer 43 can be easily supported such as a steady rest. On the contrary, the sprayer 43 can also be used as a spacer of the structure of the electric device body.

FIG. 9 is a partially fragmented perspective view showing a cooling structure for an electric device according to an embodiment of the present invention. The electric device body 30 is composed of the winding 2 and the iron core 10 divided into two,
The atomizer 40 is arranged around the winding 2, and the atomizer 43 is interposed in the core gap of the iron core 10. Other configurations are shown in FIG.
4 is the same as that of the conventional device. Therefore, the same reference numerals are used for the same portions and detailed description thereof will be omitted.

FIG. 10 is a horizontal sectional view of FIG. Iron core 1
As the atomizer 43 interposed between 0, the atomizer 43 having the structure shown in FIG. 7 is used, and the direction of the nozzle jet is directed toward the winding 2, and the cooling medium mist 14B is directed in the direction of the arrow. Let it gush out. On the other hand, as the atomizer 40, the one having the configuration shown in FIG. 1 is used, and the direction of the nozzle is also directed to the winding 2.

In FIG. 10, the arrangement of the sprayer 40 and the direction of the nozzle are the same as in the conventional structure shown in FIG. However, the sprayer 43 sprays the cooling medium directly onto the portion of the winding 2 shaded by the iron core 10. Therefore, the cooling characteristic of the winding 2 is improved, and the cooling efficiency of the entire electric device is improved. In addition, as shown in FIG.
Since it is easy to take it in and out from the upper part, maintenance and inspection of the sprayers 40, 43 are also easy.

FIG. 11 is a horizontal sectional view showing a cooling structure for an electric device according to a different embodiment of the present invention. Iron core 10
The atomizer 44 is also interposed in the core gap of the central leg of the.
The other structure is the same as that of FIG. Atomizer 44
Is similar to that of the arrangement shown in FIG. 7, but with its nozzles oriented in two directions. With this configuration, the sprayer 44 can spray the cooling medium also on the inner diameter side of the winding 2. With this configuration, the cooling efficiency of the electric device is further improved as compared with the case of FIG.

FIG. 12 is a horizontal sectional view showing a cooling structure for electric equipment according to a further different embodiment of the present invention. The electric device main body 300 includes a three-legged iron core 100 and the iron core 10
It is a three-phase inner iron type transformer including three main windings 0 and three-phase windings 200. The atomizers 40 and 45 are arranged between the winding wire 200 and the tank 120, and the atomizer 43 is arranged in the iron core gap of the divided iron core 100.

Atomizers 40 arranged at the four corners of the tank 120
1 is used, the nozzle of which is directed to the nearby winding 200. Further, as the sprayer 45 arranged between the windings 200 of each phase, a sprayer having a structure similar to that shown in FIG. 6 is used, and the directions of the nozzles are approximately 90.
Differently, it is directed to both windings 200. Further, the atomizer 43 interposed in the iron core 100 has two of the constitution shown in FIG. 7 for each leg, and the direction of the nozzle is the inner diameter side of the winding 200 as shown by the fog 14B indicated by the arrow. It is spraying. With this configuration, the cooling medium can be directly sprayed onto the portion of the winding 200 shaded by the iron core 100 even for a three-phase inner iron type transformer, and the cooling efficiency can be improved as shown in FIG.
It was possible to make it equivalent to the case of the outer iron type transformer shown in 1.

[0025]

As described above, according to the present invention, the atomizer sprays the liquid-state cooling medium into the inside of the tank, and the straight liquid-conducting pipe, and the nozzle embedded in the liquid-conducting pipe to spray the liquid-state cooling medium into the tank. The plurality of nozzles are arranged side by side in the axial direction of the liquid guiding tube, and one end of the liquid guiding tube is detachably fixed to the tank wall via the flange. In this structure, since the sprayer is straight, it can be easily taken in and out from the outside of the tank, and the maintenance and inspection of the nozzle becomes easy. Also, if the nozzle does not stick out from the outer diameter of the liquid guiding tube, the sprayer can be inserted even in the slight gap of the main body of the electric device, and it can be placed very close to the heating element to improve cooling efficiency. You can

Moreover, since the liquid guide tube has a rectangular cross-sectional outer periphery, the liquid guide tube can be easily sandwiched by the insulator and the iron core that form the main body of the electric device, and the sprayer can be easily supported. Become. On the contrary, the rectangular sprayer can also be used as a spacer of the structure of the electric device body. Further, the iron core of the electric device body was divided through the iron core gap, and the atomizer was interposed in the iron core gap. With this configuration, by directing the nozzle toward the winding side, the cooling medium can be directly sprayed onto the portion of the winding shaded by the iron core, and the cooling efficiency can be significantly increased as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a sprayer according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a view on arrow P of FIG.

FIG. 4 is a sectional view taken along line YY of FIG.

FIG. 5 is a sectional view showing the structure of a sprayer according to another embodiment of the present invention.

FIG. 6 is a sectional view showing the structure of a sprayer according to a further different embodiment of the present invention.

FIG. 7 is a sectional view showing the structure of a sprayer according to a further different embodiment of the present invention.

8 is a sectional view taken along line ZZ of FIG.

FIG. 9 is a partially crushed perspective view showing a cooling structure for an electric device according to an embodiment of the present invention.

FIG. 10 is a horizontal sectional view of FIG.

FIG. 11 is a horizontal sectional view showing a cooling structure for an electric device according to another embodiment of the present invention.

FIG. 12 is a horizontal sectional view showing a cooling structure for an electric device according to a further different embodiment of the present invention.

FIG. 13 is a principle diagram illustrating a cooling structure of an electric device.

FIG. 14 is a partially crushed perspective view showing an example of a conventional cooling structure for electric equipment.

[Explanation of symbols]

 10 Iron core 100 Iron core 2 Winding 200 Winding 30 Electric equipment main body 300 Electric equipment main body 12 Tank 120 Tank 12A Tank inside 12B Flange opening 8 Mounting bracket 9 Flange 9A Screw hole 18 Liquid feed pipe 40 Sprayer 41 Sprayer 42 Sprayer 43 Sprayer 44 Atomizer 45 Atomizer 50 Liquid conduit 51 Liquid conduit 52 Liquid conduit 53 Liquid conduit 60 Nozzle 61 Nozzle 62 Nozzle 63 Nozzle 7 Liquid introducing hole 50A hole 60A Screw part 60B Notch part 60C Gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Inatama 1-4-1, Mei Station, Nakamura-ku, Aichi Prefecture Tokai Passenger Railway Co., Ltd. (72) Inventor Yoshitake Nakagami Kawasaki-ku, Kawasaki-shi, Kanagawa No. 1 in Shinden Tanabe Fuji Electric Co., Ltd. (72) Inventor Toshihide Watanabe No. 1 in Shinden Tanabe, Kanagawa Prefecture Kawasaki City Kawasaki City (72) Inventor Yukio Okamoto Kawasaki Ward, Kawasaki City Kanagawa Prefecture No. 1 Nitta Tanabe Fuji Electric Co., Ltd.

Claims (3)

[Claims] 1. A tank accommodating an electric device body together with an insulating gas, an insulative sprayer for spraying a liquid cooling medium into the tank, and a condenser for liquefying the cooling medium vaporized by the heat of the electric device body. , A liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed pump for sending the cooling medium accumulated in the liquid reservoir to the atomizer, and cools the electric device body by latent heat of vaporization of the cooling medium. Since the sprayer is a linear liquid guiding pipe for guiding the liquid cooling medium into the tank, and a nozzle embedded in the liquid guiding pipe for spraying the liquid cooling medium into the tank, the nozzle is A cooling structure for electric equipment, wherein a plurality of liquid guiding pipes are arranged side by side in the axial direction, and one end of the liquid guiding pipe is detachably fixed to a tank wall via a flange. 2. The cooling structure for an electric device according to claim 1, wherein the outer circumference of the liquid guiding tube is rectangular. 3. An electric device comprising a winding and an iron core, wherein the iron core is divided through an iron core gap, and the atomizer is provided in the iron core gap. A cooling structure for electric equipment, characterized in that