JPS60133708A - Vaporization cooling winding - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency of a vaporization-cooling winding by providing channels having a gradient between pancake coil layers. CONSTITUTION:Channels 15 are formed between the layers of a pan-cake coil 4 so as to have a gradient rising towrd the outer periphery of the coil. Thereby, bubbles generated on the cooling surfaces of the coil 4 will not stay there but immediately rise up along the channels 15 automatically so that they are discharged from the outer peripheral edges of the coil 4. Further, since the convection of a cooling medium 3 is increased as the bubbles rise up while new modium 3 is supplied from a central channel 6 to the channels 1, the coil 4 can be efficiently cooled without requiring channels 15 having an excessively large diameter. Thus, the space factor of the coil 4 to the winding is increased, and the electric current density also can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to boiling cooling windings, and particularly to improving the cooling efficiency thereof.

[Prior art]

Figure 7 is a side cross-sectional diagram showing a conventional evaporative cooling winding. Hydrogen 1. It is stored immersed in liquid (e.g., liquid cables, etc.).

This winding unit is boiled and cooled by the refrigerant 3, so that a strong magnetic field or a large amount of energy is generated. The winding coil has a plurality of circular pancake coils. The pancake coils are arranged concentrically at regular intervals. Between the layers of the pancake coil is a radially extending channel 5 through which the coolant 3 flows.
are formed in multiple numbers. A central channel 6 is provided in the center of the pancake coil 6, which extends through the pancake coil in the axial direction. Note that 7 is a bubble generated when the winding λ is cooled by the coolant 3.

Cooling of the refrigerant 3 to the windings constructed in this way is done by selecting the nucleate boiling region so that film boiling and dryout do not occur.

By the way, in the conventional evaporative cooling winding, the pancake coil is installed almost horizontally, so the channel 5 is also horizontal, and the air bubbles 7 generated when the pancake coil is cooled remain in the channel j and channel s. The inside of the winding core is occupied by air bubbles that have a negative effect on the cooling efficiency, and the cooling efficiency of the entire winding core deteriorates.As a solution to this problem, it is necessary to have a large number of channels S and a large channel S diameter. However, there were drawbacks such as a lower space factor for pancake coils compared to other conventional methods.

[Summary of the invention]

This invention was made with the purpose of eliminating the above-mentioned drawbacks, and by using a simple configuration in which a channel with a slope is provided between the pancake coil layers, air bubbles that reduce the cooling efficiency are automatically discharged from the channel, and the cooling efficiency is reduced. This provides an efficient boiling cooling winding.

[Embodiments of the invention]

Hereinafter, one embodiment of the evaporative cooling winding of the present invention will be explained based on the drawings. FIG. 2 is a side sectional view showing one embodiment of the present invention, in which parts that are the same as or similar to those in FIG. The channel/S formed between the pancake coil layers has a slope that increases toward the outer circumference. With this configuration, the air bubbles 7 generated on the cooling surface of the pancake coil hiro do not stay there, but immediately overflow into the channel 3, automatically rise, and are discharged to the outer periphery of the pancake coil hiro. . In addition, as the bubbles 7 rise, the convection of the refrigerant 3 is enhanced, and new refrigerant 3 is supplied from the center channel 6 to the channel/left, so the pancake coil Hiro is efficiently cooled and the channel 15 diameter Do not make it larger than necessary.

Also, the diameter of the pancake coil Hiro is large and the channel/!
When r is too long, the channel /
An axially extending refrigerant supply channel/g may be provided in the middle part of 3. By doing so, the eight hours that the bubbles 7 stay in the diameter of the channel 15 is shortened, and the cooling efficiency of the windings is improved.

Although the above embodiment describes the case where the present invention is applied to boiling-cooled windings, it goes without saying that it can be used not only for cooling windings but also for any object that is cooled with a refrigerant that utilizes latent heat of vaporization.

〔Effect of the invention〕

As explained above, according to the present invention, the air bubbles generated by boiling cooling and having a negative effect on the cooling efficiency are automatically eliminated by the simple structure of providing a sloped channel between the layers of the puncture (3) coil. Since the air is discharged from the channel, the cooling efficiency of the pancake coil is improved.Therefore, there is no need to have a large number of channels and a large channel diameter, so the space factor of the pancake coil relative to the winding is high, increasing the current density. be able to.

Moreover, the overall size of the winding is small, and the weight can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing a conventional evaporative cooling winding, FIG. 2 is a side sectional view showing one embodiment of the present invention, and FIG. 3 is a side sectional view showing another embodiment of the present invention. . /...container, co...winding, 3...refrigerant, l...pancake coil,! , /&...-channel, 6... center channel, 7... air bubble, it... refrigerant supply channel. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In the boiling cooling winding, in which pancake coils arranged coaxially at regular intervals are immersed in a cooling medium, the pancake coils have a channel crab gradient formed between the pancake coil layers. A boiling cooling winding characterized in that it is provided as follows.