JPS6317222Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an oil-filled induction electric appliance that improves the flow of insulating oil flowing into the winding.

[Technical background of the invention]

As shown in Figure 1, a general self-cooling type oil-filled induction electric appliance stores an iron core 1 and a winding 2 together with insulating oil in a tank 4, and upper and lower piping 3 in the tank 4.
It is configured to be connected to the heat radiator 5 via a and 3b. The insulating oil removes heat generated from the iron core 1 and the winding 2, enters the radiator 5 from the upper pipe 3a of the tank 4, is cooled there, and is circulated back into the tank 4 through the lower pipe 3b. The iron core 1 and the winding 2 are tightened through upper and lower clamps 6a and 6b, respectively, and between the lower clamp 6b and the winding 2, insulating oil is allowed to flow into the winding 2 as shown in FIG. An insulating member 7 is provided to form a spacing. This insulating member 7 is shown in FIGS.
As shown in the figure, a plurality of spacers 6b are fixed in the radial direction on the upper surface of a ring-shaped insulating plate 7a, and as the insulating oil passes between these spacers 6b, the inner part of the winding 2, in particular, Low voltage winding 2
It is designed to flow into a. Furthermore, an insulating member 8 consisting of an insulating paper 8a and a spacer 8b is disposed between the outer high voltage winding 2b constituting the winding 2 and the insulating member 7.
Insulating oil flows into the high-voltage winding 2b through the gap 2b.

[Problems with background technology]

By the way, in the above conventional structure, the part of the lower clamp 6b that supports the insulating member 7, that is, the winding support part 16b, is formed on a horizontal plane, and the winding 2 is supported on this winding support part 16b via the insulating member 7. has been done. Therefore, if the height H of the spacers 7a of the insulating member 7 is low, the interval between the spacers 7a, that is, the area where the insulating oil enters becomes small, and the winding 2, especially the low voltage winding 2a, is not sufficiently cooled, and this portion There was a problem with the temperature increasing.
On the other hand, if the height H of the spacer 7a is increased, the cooling effect will be improved, but the window size of the iron core 1 will become larger.
There were problems such as the overall weight and height of the oil-filled induction electric device increased, making it more expensive.

[Purpose of invention]

This invention was made taking the above points into consideration.
The purpose is to provide an oil-filled induction electric appliance that increases the cooling effect of the windings without increasing the overall size.

[Summary of the idea]

To achieve this objective, the present invention increases the area through which insulating oil flows into the windings by slanting a part of the winding support part of the lower clamp that fixes the core and windings downward. It is characterized by increasing the cooling effect of the winding.

[Example of idea]

An oil-filled induction electric appliance according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 5, in which the same parts shown in FIGS. 1 to 4 are given the same reference numerals, the iron core 1 and the winding 2 are housed inside a tank 4 together with insulating oil. A radiator 5 is connected to the tank 4 via upper (not shown) and lower piping 3b. The iron core 1 and the winding 2 are tightened by an upper clamp (not shown) and a lower clamp 10, and the winding 2 is tightened by the winding support portion 10a of the lower clamp 10.
10b. The lower clamp 10 is the sixth
As shown in FIGS. 8 to 8, a part 10 of the winding support portion 10a faces the windings wound around each leg of the iron core 1.
b is tilted downward by an angle θ. The magnitude of the inclination angle θ of the winding support portion 10b is determined by the angle of inclination θ of the winding structure and the tank 4 of the lower piping 3b communicating with the radiator 5.
Set appropriately depending on the mounting position. Note that reinforcing plates 10c are provided on both sides of this inclined winding support portion 10b. As shown in FIG. 9, the insulating members placed on the lower clamp 10 include spacers 11a of equal height on the horizontal winding support portion 10a of the lower clamp 10, and spacers 11a of equal height on the inclined winding support portion 10b. A spacer 11b having a slope on one side matching the inclination angle is arranged on an insulating plate 11c so that the upper surface of each spacer 11a, 11b is horizontal. Note that, depending on the size of the winding 2, the spacer 11b disposed on the inclined winding support portion 10b may be omitted.

Next, the effects of the present invention will be explained. The insulating oil cooled by the heat radiator 5 flows into the winding 2 through an insulating member disposed at the bottom of the winding 2.
Since 0b is formed, the area of the oil inlet is large and the flow path resistance is small. Therefore, the insulating oil easily flows to the center of the winding 2, and the flow velocity of the oil passage inside the winding 2 increases, so that the cooling effect of the winding 2 can be improved. Moreover, since the part of the winding support portion 10b of the lower clamp 10 is inclined to increase the area of the oil inlet, the height of the spacer 11a interposed between the winding 2 and the lower clamp 10 can be increased. There's no need to. Therefore, since the size of one window in the core does not increase, the overall height and weight do not increase.

Note that the lower clamp 10 needs to have the strength to withstand the short-circuit mechanical force of the winding 2, but since the inclined winding support portion 10b is formed only in the part of the lower clamp 10 that faces the winding 2, it has great strength. It will not cause any decline.

[Effect of idea]

As explained above, according to the oil-filled induction electric appliance of the present invention, by forming the inclined winding support part in a part of the lower clamp, the area of the oil inlet into the inside of the winding can be increased. Good cooling of the winding can be achieved without increasing the size.

[Brief explanation of drawings]

Figure 1 is a cross-sectional front view showing a general oil-filled induction electric appliance, Figure 2 is an enlarged cross-sectional view of the main part of Figure 1, and Figures 3 and 4 are the insulating members shown in Figure 2. 5 is a sectional view showing the main parts of the oil-filled induction electric appliance of the present invention. FIGS. 6 and 7 are a plan view and a front view of the lower clamp shown in FIG. 8 is a sectional view taken along the - line in FIG. 6, and FIG. 9 is a sectional view taken along the - line in FIG. 5. 1... Iron core, 2... Winding wire, 2a... Low voltage winding,
2b...High voltage winding, 3a, 3b...Upper and lower piping, 4...Tank, 5...Radiator, 6b, 10
... Lower clamp, 10a, 10b ... Winding support portion, 11a, 11b ... Spacer, 11c ...
Insulating board.

Claims (1)

[Scope of utility model registration request] In a tank in which an iron core and a winding are housed, an insulating oil is sealed in the tank, and a radiator is connected to the tank through upper and lower piping, a lower clamp for fixing the iron core and the winding. An oil-filled induction electric appliance characterized in that a part of the winding support part is inclined downward.