JPH0374017B2 - - Google Patents

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 liquids such as fluorocarbons can be used to cool the iron cores, which are the heat generating parts, of reactors and other electrical equipment that use insulating gases such as SF ₆ . be. However, in the past, this type of liquid was simply sprayed around the iron core, and this had the disadvantage that it was not possible to spread it all around the iron core, so uniform cooling of the iron core could not be expected.

(Problems to be Solved by the Invention) When dispersing an insulating evaporative cooling liquid onto the iron core, the present invention enables the liquid to be uniformly spread over the iron core, thereby increasing the temperature of the iron core based on cooling by the liquid. The aim is to equalize the

(Means for Solving the Problems) This invention targets 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 each core.

(Function) Since the coolant flows over the surface of the core between the outside and the inside, the coolant flows through the surface of each core, and therefore simply Compared to the case where the coolant is only sprayed from the outside of the core, the coolant can be sprayed almost uniformly over the surface of the core.

(Example) An example of the present invention will be described with reference to the drawings. The embodiment shown in the figure shows an on-site example in which the present invention is applied to cooling a core leg of a reactor.
A plurality of magnetic materials are stacked on top of each other 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 a hardware for holding down the core, 7 is a hardware for supporting the core, and 8 is a stud for tightening the core. The iron core 2 stacked between the upper and lower yokes 4 and 5 is connected to both metal fittings 6 and 7.
The studs 8 are fixed by being inserted through the guides of the metal fittings 6, 7, the yokes 4, 5, and the iron cores 2. In this way, the core leg 1 is constructed.

The above configuration is not particularly different from this type of reactor, and for main insulation such as interphase insulation and earth insulation, it is filled with a mixed gas containing an insulating gas such as SF ₆ 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 drip hole 12 for dripping a coolant. The liquid 10 dripped from the drip 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 the iron core 2).
Let it be A. ) towards the surface.

The inner guide 15, which is installed in the iron core 2A and also serves as a stud guide, is formed to a size that fits into the inner diameter of the iron core 2A, as shown in FIG. hole 16
A gas vent hole 17 is provided through which the aforementioned gas flows. A portion of the liquid 10 directed toward the iron core 2A is guided by the guide 15 and flows from its surface along the surface of the iron core 2A, and the remaining portion flows downward from the gas vent hole 17. former liquid 10
flows on the surface of the iron core 2A from the inside to the outside. In order to ensure this flow,
As shown in the figure, the guide 15 is made 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 the 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 is provided with an inclined surface 18A that is inclined toward the inner side of the iron core. 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 liquid 10 is distributed between the first stage iron core 2A and the second stage iron core 2A.
The direction of the flow is opposite to that of the iron core 2B in the second stage.

The liquid flowing toward the center of the surface of the iron core 2B joins with the liquid flowing down from the gas vent hole 17, and flows around the rectangular stud guide 19 installed on the inner diameter of the iron core 2B and the liquid that has flowed down from the gas vent hole 17. It flows down toward the third stage iron core (this will be referred to as iron core 2C) through the gap between the inner circumferential surface of the iron core and the inner circumferential surface of the iron core. In addition,
The stud guide 19 is provided with a through hole 20 through which the stud 8 passes, and the stud 8 is inserted through the through hole 20.

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 from the inside to the outside on the surface of the iron core 2C. 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 iron core 2D of the iron core 2C is
Like the iron core 2B, it is provided with an outer guide 18 and a stud guide 19. The liquid that has fallen onto the surface of the guide 18 flows on the surface of the iron core 2D from the outside to the inside. Repeat this below.

The liquid that has flowed down inside the inner diameter of the iron core at the lowest stage is transferred to the inner guide 25 installed in the yoke 5.
It flows over the surface from the inside to the outside. Guide 25 is stud 8 like the other guides.
The stud 8 is provided with a through hole 26 through which the stud 8 is guided.

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 absorbing 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. Moreover, since the surface of the guide 15 is higher than the surface of the iron core, and the guide 18 is provided with the inclined surface 18A, the flow of the liquid 10 is ensured and smooth. Therefore, each core can be efficiently cooled.

On the other hand, as mentioned above, there is interphase insulation inside the reactor.
For main insulation such as ground insulation, it is filled with a mixed gas containing an insulating gas such as SF ₆ gas, and in this state the liquid flows down and is sprayed as described above. 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. 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 detailed 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, and the flow of the liquid is directed to the inner and outer guides. As a result, the liquid can be sprayed more uniformly and reliably onto the iron core than in the past, and the temperature of the iron core can therefore be made more uniform. be effective.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an embodiment of the present invention;
5 through 5 are plan views of each guide. 1... Iron core leg, 2, 2A to 2D... Iron core, 10
...Evaporative cooling liquid, 11...Cooling liquid reservoir, 15,1
9, 23, 25... Inner guide, 18... Outer guide, 18A... Inclined surface.

Claims (1)

[Claims] 1 A core leg is constructed by stacking disc-shaped cores in multiple stages via a magnetic gap, and a cooling liquid reservoir for storing an insulating evaporative cooling liquid is provided above the core leg, and a cooling liquid reservoir is provided above the core leg, and a cooling liquid reservoir is provided in the inner diameter part of the core. an inner guide provided at a position higher than the surface of the iron core so as to guide the evaporative cooling liquid toward the outside; and an inner guide provided on the outer periphery of the iron core to guide the evaporative cooling liquid toward the inside. Outer guides having inclined surfaces that are inclined toward the inner side of the core are arranged alternately on each core constituting the core leg so that the cooling fluid flowing down from the coolant reservoir is A core cooling device for electrical equipment, wherein evaporative cooling liquid flows alternately from inside to outside and from outside to inside on each surface of the core.