JPS6194310A - Iron core cooling unit for electric apparatus - Google Patents

Abstract

PURPOSE:To uniformly cool an iron core by hanging down a pipe which sprays a liquid from the holes around the pipe through the hole of the iron core from a tank filled with an evaporating cooling liquid provided on the top of the iron cores which are accumulated with non-magnetic materials between the cores for the iron core of an electric apparatus. CONSTITUTION:Plural disk type iron cores 2 are accumulated with a non- magnetic material 3 placed between the cores, a top yoke 4 and a bottom yoke 5 are attached, a clamp metal 6 and a support metal 7 are provided on the top and beneath the bottom of the cores and these are clamped with a stud 8 in the central hole of the core 2. In this construction, a tank 11 filled with a cooling liquid 10 such as fluorocarbon is provided on the clamp metal 6 and a pipe 13 which encloses the stud 8 in the hole of the core 2 is inserted from the bottom surface of the tank 11 through a hole 12 provided in the metal 6. The liquid 10 is sprayed from many holes 2A on the side wall of the pipe 13 and the excessive liquid is exhausted from the lowest hole 14.

Description

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

(Prior art) An insulating gas such as SF is used. Insulating evaporative cooling liquids such as fluorocarbons are sometimes used to cool the iron cores of transformers and other electrical equipment. In order to equalize the temperature of the iron core using this type of liquid, it is important to spread the liquid evenly over the iron core. Therefore, in the past, a spraying device for the liquid was installed above the top of the iron core to spray the liquid from the top of the iron core.

However, the liquid evaporates when it comes into contact with the heat generating part, so if the liquid is small, it will all evaporate by the time it reaches the lower iron core, so the lower iron core will not be cooled by the liquid. This may cause local overheating. Particularly in this type of electrical equipment, since the temperature of the lower iron core increases, it is desirable to spray more of the liquid onto the lower iron core.

(Problems to be Solved by the Invention) This invention makes it possible to reliably spread the insulating evaporative cooling liquid to the iron core below, thereby increasing the cooling of the iron core by the liquid. The purpose is to achieve uniformity.

(Means for Solving the Problems) This invention provides a liquid reservoir for evaporative cooling liquid above the uppermost iron core, and provides a pipe-shaped flow passage connected to the liquid reservoir inside the iron core and below it. Place it in an extended direction,
It is characterized in that the flow path is provided with a plurality of holes through which the liquid flows out toward the iron core.

(Function) Since the flow passage is arranged to extend downward from the iron core, the evaporative cooling liquid therein also flows out toward the iron core from the holes in the flow passage near the lowermost iron core. I come to do it. At this time, the head pressure of the liquid increases the outflow pressure of the liquid from the holes in the flow passage toward the bottom of the iron core, so more liquid is sprayed onto the iron core, thereby ensuring that the lower iron core is It will be cooled down to. In other words, as a result of this, the cooling of the iron core by the liquid becomes sufficiently uniform.

(Example) An example of the present invention will be described with reference to the drawings. The illustrated embodiment shows an example in which the present invention is applied to cooling a core leg of a reactor. Reference numeral 1 designates the core leg. They are stacked with a non-magnetic material 3 interposed therebetween to form a. 4 is an upper yoke, 5 is a lower yoke, 6 is hardware for supporting the core, 7 is hardware for supporting the core, and 8 is a stud for attaching the core. Both upper and lower yokes 4.5
The core 2 stacked between them is supported between the face fittings 6, 7, and the studs 8 are attached to each of the fittings 6, 7. It is fixed by being inserted through each of the yokes 4 and 5.

In this way, the core leg 1 is constructed. The above configuration is not particularly different from this type of reactor, and is filled with a mixed gas containing an insulating gas such as SFs gas for main insulation such as interphase insulation and earth insulation.

In accordance with this invention, in the embodiment shown in FIG. For example, a cooling liquid reservoir 11 is installed 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 down into a flow path 13 that is disposed inside the core leg 1 and extends downward from the core leg 1.

The flow passage 13 is configured in a pipe shape. The embodiment shown in FIG. 1 is constructed in the form of a double pipe, through which a stud 8 passes. The flow path 13 has a bottomed bottom, and a large number of holes 14 are provided in the outer circumferential wall thereof. The holes 14 are located between each core 2 so as to face each other.

Note that if the outer pipe portion of the flow passage 13 is made to circumscribe the inner surface of the inner cylindrical portion 2A of the iron core 2 as shown in the figure,
It is convenient that the flow path 13 can also be used for positioning the iron core.

In the above configuration, the liquid 10 that has flowed down from the cooling liquid reservoir 11 to the drip hole 12 flows through the flow path 13 as it is. Then, it flows out from the hole 14 provided in the peripheral wall and is distributed to the iron core 2 from inside. The arrows in the figure indicate the flow paths of the liquid 1o. When the sprayed liquid comes into contact with the heating iron core, it absorbs the generated heat and evaporates. The iron core is cooled by absorption of this generated heat.

According to such distribution and dispersion state of the liquid 10, even when the amount of liquid used is small, the holes 1 at the lower part of the flow path 13
4, the liquid 10 begins to flow out in a liquid state. Therefore, there is no possibility that the liquid 10 does not reach the lower iron core 2 unlike in the conventional case. Also, flow path 1
The head pressure of the liquid 10 causes holes 14 to reach the lower part of the hole 14.
The outflow pressure of liquid 10 from is increased. Therefore, distribution path 1
More liquid will flow through the holes 14 at the bottom of 3, so that there is no room for local overheating in the core below. It is convenient to make the diameter of the hole at the bottom larger so that even more liquid can be sprayed.

On the other hand, as mentioned above, the reactor is filled with a mixed gas containing an insulating gas such as SF and gas for main insulation such as phase-to-phase insulation and ground-to-ground insulation, and in that state, the liquid is mixed as described above. It flows down and is dispersed. The vapor of the liquid 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.

When it is necessary to increase the outflow speed of the liquid 10 from the hole 14 of the flow path 13, it is preferable to adopt a configuration as shown in FIG. This is an example in which the passage 17 formed between the two is spiral. This can be easily constructed by arranging a large number of spiral partitions 18 between both wall portions 15 and 16. With this configuration, since the liquid 10 flows down while rotating, a centrifugal force acts, thereby increasing the flow rate of the liquid 10 from the hole 14.

In another embodiment shown in FIG. 3, a plurality of pipes 21 of different lengths are connected to the bottom of the cooling liquid reservoir 11, and a hole 14 is provided around the circumference at each end of the pipe. It has a structure in which pipes 22 for use are connected. Then, each pipe 22 is installed inside each iron core 2. With such a configuration as well, the liquid 10 can be sprayed from inside the core.

(Effects of the Invention) As detailed above, according to the present invention, a liquid flow path is provided extending along the length direction of the iron core, a hole for liquid outflow is formed in this, and the iron core is Since the liquid was sprayed from inside towards the iron core,
Since the liquid in the state before evaporation can be reliably spread, the iron core can be uniformly cooled, and local overheating in the lower iron core can be reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a partially cutaway perspective view of a flow path in another embodiment of the invention, and FIG. 3 is a further embodiment of the invention. A cross-sectional view showing an example,
FIG. 4 is a perspective view of a portion of the flow path of FIG. 3.

Claims (1)

[Claims] A liquid reservoir for storing an insulating evaporative cooling liquid is provided above the cylindrical core, and a pipe-shaped flow path is connected to the liquid reservoir and allows the evaporative cooling liquid to flow inside the iron core. What is claimed is: 1. An iron core cooling device for electrical equipment, wherein a plurality of holes are arranged to extend downward and are provided in the flow path for dispersing the evaporative cooling liquid toward the iron core.