JPS5934094Y2 - oil-filled appliances - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil-filled electric appliance that efficiently cools the inner wall of the tank near the cut in the tank shield provided on the inner wall of the tank.

In Figure 1, which shows a conventional oil-filled electrical appliance, an iron core 1 and a winding 2 are shown.
In the tank 5 which houses the contents of the electric appliance, including the upper fastener 3 and the lower oil pipe fastener 4, leakage magnetic flux leaking from the winding 2 invades the side wall of the tank 5.

In order to prevent losses from occurring due to the flow of eddy currents within the tank 5, a tank shield 6 is attached to that portion to reduce losses.

However, the shape of the tank 5 is determined by factors such as the transportation conditions of the electrical appliance.

As a result, the range where the tank shield 6 can be pasted is limited.

Therefore, the leakage magnetic flux causes a local heating part a to be generated in the vicinity of the cut in the tank shield 6, resulting in a loss area, and as a result, there is a drawback that the temperature locally increases excessively.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, and to provide a highly reliable oil-filled electrical appliance that prevents excessive local temperature rise.

In this invention, a cooling hole is provided on the tank inner wall side of the lower oil pipe fastener to form a forced oil circulation path near the cut in the tank shield, and the oil is forced to flow to the area where the local temperature rises excessively. It is designed to efficiently cool the

An embodiment of the oil-filled electrical appliance of the present invention will be described below with reference to FIGS. 2 and 3, in which the same parts as those of the conventional oil-filled electrical appliance are denoted by the same reference numerals.

Oil is sent to the lower oil pipe clamp 4 by an oil pump 9 provided outside the tank 5.

Reference numeral 10 denotes an oil outlet hole of an oil circulation path that sends oil to the winding 2.

A large number of cooling holes 7 are provided in the lower oil pipe clamp 4 in a portion facing the inner wall of the tank 5, and the holes are formed so as to forcibly lead oil to the vicinity of the cutout of the tank shield 6 on the side wall of the tank 5. There is.

In other words, the cooling hole 7 is formed to correspond to the inclined surface formed on the lower end side of the tank 5.

The oil from this cooling hole 7 flows out in the direction of the arrow as shown in FIGS. 2 and 3.

At this time, the oil is guided by the inclined surface and reliably collides violently with the end of the tank shield 6, so that the end of the tank shield is cooled.

Therefore, it is possible to eliminate local overheating at the end of the tank shield.

The tank shield 6 can be used as a shielding material, whether it is a conductive shield made of copper, aluminum, or the like, or a magnetic shield made of laminated silicon steel plates.

FIG. 4 shows another embodiment of the oil-filled electrical appliance of the present invention, in which oil is sent to the lower oil pipe fasteners 4 on both sides by one oil pump 9, and is similar to the above embodiment. It has the following effects.

FIG. 5 shows yet another embodiment of the oil-filled electrical appliance of the present invention, which is a preferred embodiment when the cut in the tank shield 6 is located farther from the lower oil pipe fastener 4 due to the shape of the tank 5.
A cooling oil guide pipe 8 is attached to the cooling hole 7 of the lower oil pipe clamp 4, and its open end is located near the cut in the tank shield 6.

Therefore, even more effective cooling can be achieved. As described above, the oil-filled electrical appliance of the present invention efficiently circulates cooling oil near the cut in the tank shield.
This has the effect of preventing local heating of the tank side plate near the cut in the tank shield and improving reliability.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a conventional oil-filled electrical appliance, FIG. 2 is a vertical sectional view showing an embodiment of the oil-filled electrical appliance of the present invention, and FIG. A cross-sectional view of the lower oil conduit fastener, FIG. 4 is a sectional view of the same part as FIG. 3 of another embodiment of the oil-filled electrical appliance of the present invention, and FIG. FIG. 2 is a detailed view of the same part as part A in FIG. 2 of the embodiment. 1...Iron core, 2...Winding, 3...
・・Lower fastener, 4・・・・Lower oil pipe fastener, 5・
...tank, 6...tank shield, 7
...Cooling hole, 9...Oil pump.

Claims (1)

[Scope of utility model registration request] An electrical appliance consisting of an iron core wrapped with a winding wire, upper and lower fasteners for tightening the upper and lower ends of the core, and an inclined surface on the lower end side that accommodates the electrical appliance contents inside and corresponds to the lower fastener. A tank comprising a tank having a formed tank shield, an oil pump that fills the tank with oil and is provided outside the tank, and an oil circulation path that circulates oil into the lower fastener by the oil pump, An oil-filled electrical appliance characterized in that a cooling hole is formed in the upper inclined surface and the corresponding lower fastener to release oil.