JPS6194309A - Iron core cooling unit for electric apparatus - Google Patents

Abstract

PURPOSE:To uniformly cool the surface of an iron core by alternately making a liquid flow on the surface of the iron core from inside to outside and from outside to inside each using a guide from a tank filled with an insulating and evaporating cooling liquid provided over the circular disk iron cores accumulated in many stages with magnetic gaps. CONSTITUTION:Plural circular disk iron cores 2 are accumulated with non- magnetic gap materials 3, the outside is enclosed with an insulation cylinder 28, a top yoke 4 and a clamp metal 6 are provided on the top core, a bottom yoke 5 and a support metal 7 are provided beneath the bottom core and these are clamped in the longitudinal direction using a stud 8. A tank 11 filled with an insulating and evaporating cooling liquid 10 such as fluorocarbon is provided on the metal 6. The liquid 10 flows down from the tank 11 along the stud 8 in the central space of the iron core 2. The central space of each iron core 2 is closed with inner guides 15, 19 and the liquid 10 flows from inside to outside and in the next stage, flows from outside to inside by an external guide 18 and this is further repeated.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an iron core cooling device for electrical equipment.

(Prior art) Insulating evaporative cooling liquid such as fluorocarbon can be used to cool the iron core, which is the heat generating part, in reactors and other electrical equipment that uses insulating gas such as SF. be. However, in the past, this kind of liquid was simply sprayed around the iron core, and in this way it was not possible to spread it all around the iron core, which had the disadvantage that uniform cooling of the iron core could not be expected.

(Problems to be Solved by the Invention) This invention makes it possible to uniformly spread the insulating evaporative cooling liquid onto the iron core, thereby making the core temperature uniform due to cooling by the liquid. The purpose is to promote

(Means for Solving the Problems) This invention cools an iron core structure constituted by stacking a plurality of disk-shaped iron cores in multiple stages via magnetic gaps, and cools the iron core structure from a cooling liquid reservoir installed at the top. The cooling liquid is configured to flow down the surface of each of the iron cores while alternately flowing between the outside and inside of the core.

(Function) Since the coolant flows over the surface of the core between the outside and inside of the core, the coolant flows through the surface of each core, thus simply flowing the coolant across the core. Compared to the case where the coolant is only sprayed from the outside, it becomes possible to spray the coolant almost uniformly over the surface of the iron core.

(Embodiment) The embodiment of FIG. 9, which explains an embodiment of the present invention with figures, shows an example in which the present invention is applied to cooling a core leg of a reactor. 1 indicates the core leg, and this is a radial It is constructed by stacking a plurality of disc-shaped iron cores 2, such as iron cores, with a non-magnetic material 3 interposed therebetween to form a magnetic gap. 4 is an upper yoke, 5 is a lower yoke, 6 is hardware for holding down the core, 7 is hardware for supporting the core, and 8 is a stud for tightening the core. Both upper and lower yokes 4.5
The iron core 2 stacked between them is supported between both metal fittings 6, 7, and a stud 8 is inserted between each metal fitting 6, 7. It is fixed by being inserted through the guides of each yoke 4, 5 and each iron core 2. In this way, the core leg 1 is constructed.

The above configuration is not particularly different from this type of reactor, and because of the main insulation such as phase-to-phase insulation and ground-to-ground insulation,
It is filled with a mixed gas containing an insulating gas such as SF and gas.

According to the present invention, in the illustrated embodiment, a cooling liquid reservoir 11 is provided above the metal fitting 6 to store a cooling liquid 10 such as fluorocarbon. Further, the metal fitting 6 is provided with a cooling liquid dripping hole 12. The liquid 10 dripped from the cooling liquid dripping hole 12 flows through the hole through which the stud 8 of the upper yoke 4 passes, and flows through the first stage iron core 2. (This is referred to as iron core 2A.) toward the surface of the iron core.

The inner guide 15, which is installed in the iron core 2A and also serves as a stud guide, is formed in a size large enough to fit into the inner diameter of the iron core 2A, as shown in FIG. 2, and the stud 8 passes through it. A hole 16 and a gas flow hole 17 through which the aforementioned gas flows are provided. Liquid 1 heading towards iron core 2A
A part of the 0 flows from the surface along the surface of the iron core 2A guided by the guide 15, and the remaining part flows downward from the gas vent hole 17. The former liquid 10 is the iron core 2
The flow flows on the surface of A from the inside to the outside.In order to ensure this flow, use guide 1 as shown in Figure 1.
5 is preferably slightly higher than the surface of the iron core 2A.

The liquid 10 flowing outward on the surface of the iron core 2A flows down along the outer surface. The liquid 10 that has flowed down reaches the surface of an outer guide 18 provided on the outer periphery of the surface of the second stage iron core (this will be referred to as iron core 2B). The guide 18 has a slope 1 on the surface that slopes toward the inside of the iron core.
It is equipped with 8A. Therefore, the liquid 10 that has reached the surface of the guide 18 flows along the surface of the iron core 2B from the outside toward the center.

That is, the direction of flow of the liquid 10 is opposite between the first stage iron core 2A and the second stage iron core 2B.

The liquid flowing toward the center on the surface of the iron core 2B merges with the liquid flowing down from the gas vent hole 17, and the liquid flows toward the center of the iron core 2B.
A rectangular stud guide 1 installed on the inner diameter part of B
9 and the inner circumferential surface of the iron core 2B.
It flows down toward the tiered iron core (this is referred to as iron core 2C). Note that the stud guide 19 is provided with a through hole 20 through which the stud 8 passes, and the stud 8 is inserted through this hole.

An inner guide 21 is provided at the inner diameter portion of the iron core 2C.

The guide 21 consists of a stud guide part 22 of the same type as the stud guide 19 and a plate-shaped guide part 23, and a through hole 24 through which the stud 8 passes is formed therein. The liquid that has flowed down toward the iron core 2C as described above is guided by the guide portion 22 and flows on the surface of the iron core 2C from the inside to the outside. The flowing direction at this time is opposite to the direction when flowing on the surface of the iron core 2B.

The liquid that has flowed on the surface of the iron core 2C flows downward from the outside. The lower core 2D of the core 2C is provided with an outer guide 18 and a stud guide 19 in the same way as the core 2B. The liquid that has flowed down onto the surface of the guide 18 is
It flows on the surface of D from the outside to the inside. Repeat this below.

The liquid that has flowed down inside the inner diameter of the lowermost iron core flows from the inside to the outside on the surface of the inner guide 25 installed in the yoke 5.

The guide 25, like the other guides, has a through hole 26 through which the stud 8 passes, and guides the stud 8.

As described above, the liquid 10 flows down while being spread over each iron core, and when it comes into contact with a heating core in the process, it absorbs the generated heat and evaporates. Each core is cooled by absorption of this generated heat. The liquid flows in a staggered pattern, so it touches each core almost uniformly. This allows each core to be cooled uniformly.

On the other hand, as mentioned above, the reactor is filled with a mixed gas containing an insulating gas such as SFG gas for main insulation such as interphase insulation and earth insulation, and in this state, the liquid flows down as described above. and distributed. The vapor of the liquid 5 evaporated as described above becomes a mixed gas with the insulating gas, and is then cooled by a cooler and radiates heat into the atmosphere. As a result, the vapor is condensed, collected in a liquid reservoir below the core, and returned to the cooling liquid reservoir 11 again. Repeat this below.

Note that 28 is an insulating cylinder which also serves to prevent the flowing liquid from scattering in all directions. A required coil is wound around the outer periphery of this insulating cylinder 28, but this is omitted in the figure.

(Effects of the Invention) As described in detail above, according to the present invention, when cooling the iron core with the evaporative cooling liquid, the liquid is made to flow down inside the iron core in a staggered manner. As a result, it becomes possible to spread the material more uniformly, and therefore, the temperature of the iron core can be made more uniform.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIGS. 2 to 5 are plan views of each guide.

Claims (1)

[Claims] Disc-shaped iron cores are stacked in multiple stages via magnetic gaps,
A cooling liquid reservoir for storing an insulating evaporative cooling liquid is provided above the cooling liquid reservoir, and the evaporative cooling liquid flowing down from the cooling liquid reservoir is applied to each of the iron cores from the inside to the outside of the surface of each of the iron cores. and an iron core cooling device for electrical equipment, comprising guides arranged to guide the flow alternately from the outside to the inside.