JPH0374018B2 - - 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 are used to cool the iron cores of transformers and other electrical equipment that use insulating gases such as SF ₆ . There is. 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, with this type of dispersion mechanism, the liquid is only sprayed from the surface of the core, and cannot be sprayed inside the core. Therefore, not only is it not possible to uniformly cool the entire core, but the liquid is The drawback was that the iron core could not be cooled sufficiently because the area of the iron core where it was sprayed was small.

(Problems to be Solved by the Invention) This invention makes it possible to reliably spread the liquid from the surface of the core to the inside of the core itself when spraying an insulating evaporative cooling liquid onto the core. The purpose is to uniformly cool the iron core with the liquid and to expand the cooling area.

(Means for Solving the Problems) This invention provides a liquid reservoir for evaporative cooling liquid above the iron core, and also provides a duct inside the iron core itself through which the liquid flows, and the duct is connected to the surface of the iron core. The iron core is cooled by causing the liquid to flow through the iron core.

(Function) Since the duct is provided inside the core itself and along its length, the core is cooled by the evaporative cooling liquid not only from the surface but also from the inside. As a result, the iron core is uniformly cooled by the liquid, and the increased cooling area improves the cooling efficiency accordingly.

(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. 1 indicates the core leg, and this is a disc-shaped core 2 such as a radial core.
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 hardware for holding down the core, and 6 is a stud for tightening the core. The iron core 2 stacked between the upper and lower yokes is supported between both metal fittings, and is fixed by inserting a stud 6 through each metal fitting and each yoke. 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 5 to store a cooling liquid 10 such as, for example, fluorocarbon. Further, the metal fitting 5 is provided with a drip hole 12 for dripping a coolant. The liquid 10 dripped from the drip hole 12 passes through the inside of the yoke 4 and heads toward the uppermost iron core 2. A guide plate 13 is installed on the inner diameter part of the iron core 2, and the liquid 10 that has fallen onto the surface of the guide plate 13 is guided by the guide plate 13 and flows outward on the surface of the iron core 2. .

A duct 14 is formed inside the iron core 2 through which the liquid 10 can freely flow. Although the means for forming the duct 14 is arbitrary, in the example shown in the figure, when the iron core 2 is composed of a plurality of iron core blocks 2A formed in a substantially triangular shape by laminating magnetic steel plates, there is a gap between each iron core block 2A. A plurality of spacers 15 made of an insulator or a magnetic material such as a magnetic steel plate are interposed at appropriate intervals. In this way, each spacer 1
A duct 14 is formed between the holes 5 and 5. Note that 16 is an outer cylinder of the iron core 2, and 17 is an inner cylinder.

The liquid 10 that has flowed to the surface of the iron core 2 as described above then enters the duct 14 and circulates there. That is, the liquid 10 flows inside the core itself in the height direction. The liquid 10 that has passed through the interior of one core 2 subsequently falls onto the surface of the core 2 in the next stage. Then, it flows from the surface through the duct 14 of the iron core in the same manner as described above. Arrows in the figure indicate the flow paths of the liquid 10.
In this design, both cylinders 16 and 17 are made slightly higher than the surface of the iron core 2 as shown in the figure in order to prevent the liquid that has fallen onto the surface of the iron core 2 from flowing outward from the outer periphery of the iron core 2. . In this way, the liquid 10 that has flowed onto the surface of the iron core 2 will flow down into the duct 14 without spilling from the surface.

As the liquid 10 flows as described above, when it touches the heating iron core, it absorbs the generated heat and evaporates. The iron core 2 comes to be cooled by absorption of this generated heat. As mentioned above, the liquid is in the iron core 2.
The core is cooled not only from the surface but also from inside the core itself.

On the other hand, the inside of the reactor is filled with a mixed gas containing an insulating gas such as SF ₆ gas for main insulation such as phase-to-phase insulation and ground-to-ground insulation as described above. 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. Repeat this below.

In addition, when a spacer 15 having a shape as shown in FIG. 3 is used, a gap will be created on the outer periphery between adjacent iron core blocks 2A, which may deteriorate the magnetic properties. To prevent this, the duct 14 should be made narrower toward the outer circumference of the core, as shown in FIG. For this purpose, for example, a triangular spacer 15 may be used. In this way, the gap around the outer periphery of the iron core 2 can be reduced or completely eliminated.

(Effects of the Invention) As detailed above, according to the present invention, a duct for distributing liquid is provided inside the core itself, and the liquid is caused to flow through the duct, so that the core can be used not only on the surface but also on the surface. The liquid is also sprayed from inside, and the surface area of the core that comes into contact with the liquid increases, which increases the cooling efficiency and allows the core to be cooled uniformly. , to prevent liquid from spilling into or out of the surface of the iron core.
The effect is that the liquid can be used to cool the iron core without wasting it.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a plan view of a portion of FIG. 1, FIG. 3 is an enlarged plan view of a portion of FIG. 2, and FIG. A sectional view taken along the line A-A' in the figure, and FIG. 5 a plan view showing a part of another embodiment of the present invention. 1... Iron core leg, 2... Iron core, 10... Evaporative cooling liquid, 11... Cooling liquid reservoir, 14... Duct, 16
...outer cylinder, 17...inner cylinder.

Claims (1)

[Claims] 1. A cooling liquid reservoir for storing an insulating evaporative cooling liquid is provided above the core leg, which is constructed by stacking disc-shaped iron cores in multiple stages via a magnetic gap, and a cooling liquid reservoir is provided at the inner diameter part of the topmost iron core. It's hot,
a guide plate that guides the evaporative cooling liquid from the cooling liquid reservoir to flow outward from the surface of the uppermost core; and a guide plate provided inside each core constituting the core leg; A plurality of ducts penetrating along the height direction, an inner cylinder and an outer cylinder that are provided for each core and are in close contact with the inner and outer peripheries of the core and protrude from the surface of the core. An iron core cooling device for electrical equipment, comprising: a cylinder, and the evaporative cooling liquid flowing while being guided by the guide plate is made to flow from the surface of the iron core into the duct.