JPS6281014A - Reactor - Google Patents

Abstract

PURPOSE:To effectively cool a core by at least splitting radially a duct which communicates with a hole formed in a yoke core, and blocking its one end, thereby contacting an insulating cylinder with the outer periphery of the core and reducing the size of a winding. CONSTITUTION:A plurality of radial cores 1 are stacked through spacers 2. An insulating cylinder 4 is in contact with the outer periphery of the cores 1. A gap 7 is formed by the spacers 2 between the cores 1. Holes 9 are respectively formed at the center in the cores 1, holes 10 are formed in a yoke core 3, so that the holes 9 communicate with the hole 10. The holes 9 are split into spaces 12, 13 by a partition plate 11 made of an insulator. The space 12 communicates with the hole 10 formed at the lower yoke, and the space 13 also communicates with the hole 10. The gap 7 is partitioned by deflectors 14, 15. Cooling fluid is fed from the hole 10 into the space 12 to flow to the gap 7, to flow the surface of the cores 1 by the deflectors 14, 15 to flow to the space 12, and to be exhausted through the hole 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a reactor having a radially laminated core, and particularly to an improvement in its cooling structure.

[Technical background of the invention and its problems]

Figure 6 (2) shows a conventional reactor iron core, and Figure 7C (2) shows an enlarged view of the same. l is a radial core in which thin iron plates are laminated radially; 3 is housed in the window 3. 4 is an insulating tube placed around the radial core with an appropriate gap, and a winding 5 is attached to the outer periphery of the radial core 1. These are half-ring-shaped partition plates inserted alternately into the gaps between the insulation cylinders 4.

The cooling fluid flows through a gap 7 between the upper and lower surfaces I of the radial core 1 as shown by the arrows in FIG. The partition plate 6 forms a zigzag flow flowing into the gap 7 from the outer peripheral side of the radial core 1. This flow removes generated heat from the surface of the radial core 1 and cools the reactor core.

The cooling effect of the cooling passage described above depends on the size of the gap 8. When downsizing the reactor, etc., the inner diameter of the winding is reduced (1), which means reducing the outer diameter of the insulating cylinder 4, and the gap 8 becomes smaller unless the outer diameter of the core can be reduced. When this gap 8 is closed, the flow of cooling fluid from the lower part of the insulating cylinder 4 is reduced, and at the same time, the flow resistance from the lower part to the upper part through which the cooling fluid flows is increased, and the inflow of fluid is also reduced. In other words, extremely high pressure is required to flow the necessary cooling fluid.

The flow path resistance increases due to such a zigzag flow path, so if the partition plate 6 is removed to eliminate the zigzag flow path, the flow path resistance will decrease and the flow rate of the cooling fluid will increase, but the fluid will not flow into the gap 7. As a result, the outer circumferential surface of the radial core 1 becomes the main heat dissipation surface, resulting in poor cooling of the core.

[Purpose of the invention]

It is an object of the present invention to eliminate the above-mentioned drawbacks, to provide a reactor that can bring an insulating tube into close contact with the outer periphery of an iron core, reduce the size of the winding, and effectively cool the iron core.

[Embodiments of the invention]

An embodiment of the present invention is shown in FIGS. 3 and 4 below.

A plurality of radial cores (2) are stacked up with spacers 2 made of insulators interposed therebetween and housed within the window of the yoke core 3.

Reference numeral 4 denotes an insulating cylinder which is attached closely to the outer periphery of the radial core 1. A gap 7 is formed between the radial cores 1 by spacing pieces 2 . A hole 9 is formed in the center of the radial core 1, a hole 10 is also formed in the yoke core 3, and the holes 9 and 10 communicate with each other.

A partition plate 11 made of an insulating material is inserted into the hole 9 to divide the hole 9 into two spaces of 12.131 m. The space 12 communicates with a hole 10 provided in the lower yoke, and the space 13 communicates with a hole 10 provided in the upper yoke. Gap 7 is the fourth
Figure 1 = partitioned by flow deflection plates 14, 15 as shown.

In the above configuration, the cooling fluid flows through the lower yoke 3.
The liquid enters the space 12 through the hole 10 provided in the hole 10, and flows into the gap 7, respectively. The inflowing cooling fluid flows on the surface of the radial core 1 through the deflection plates 14 and 151, and flows into the space 13.

The yoke 3t above the space 13 = the hole 10 provided (2) is discharged to the outside. The cooling fluid circulating in the gap 7 is prevented from flowing out to the outside by the insulating cylinder 4.

Figures 5, 6, and 7 (showing two modified examples). This is a structure that allows you to obtain a fluent C.

[Effect of the invention〕 According to the invention, the inlet provided in the yoke core.

The outlet can be made relatively easily (2) and has no effect on the inner diameter of the winding (2).Also, the hole provided at the center of the radial iron core is effective in preventing the radial iron plates from coming into contact with each other at the center, and is effective in preventing the fluid from coming into contact with the radial iron plates. It is also convenient for flushing.

By using the present invention, the inflow and outflow of fluid from the holes provided in the yoke core are not related to the insulating cylinder, and the cooling flow path can be designed separately from electrical insulation. Depending on the magnitude of the temperature rise of the cooling fluid, it is also possible to design a method in which the cooling fluid flows in parallel through the gap 7 or a method in which the cooling fluid flows in series such as a zigzag flow shown in a modification.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a radial core portion, FIG. 2 is a sectional view taken along IV-IV in FIG. 1, and FIG. 3 is a front view showing a modified example of the flow path. Figure 4 is an enlarged view of the central core in Figure 5, Figure 5 is a sectional view taken along the line ■-■ in the *th episode, Figure 6 is a partial sectional view of a reactor with a conventional cooling passage, and Figure 7 is FIG. 2 is an enlarged view of the central core portion of FIG. 1; 1... Radial core 2... - Spacing piece 3... Yoke core 4... Insulating tube 7... Gap
9.10... Hole 11... Partition plate 12.1
3...-Space 14.15... Straight flow plate

Claims (1)

[Claims] In a reactor in which a plurality of radial cores made by laminating thin iron plates in a radial manner are stacked together and housed in a window of a yoke core via spacers made of insulators, and an insulating cylinder is arranged around the radial core, the center part of the radial core is forming a hole, making the hole communicate with the gap between the cores, forming a duct communicating with the hole formed in the yoke core, dividing the duct into at least two parts in a radial direction, and connecting one end of the duct with the gap between the cores; A reactor with a closed section.