JPS5952504B2 - magnetron - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetron, and particularly to a magnetron with improved cooling efficiency.

Generally, magnetrons are used in various devices such as microwave ovens, and FIG. 1 shows an example thereof.

In the figure, reference numeral 1 denotes an anode cylinder, from the inner wall of which a pane (not shown) protrudes toward the center, and a negative electrode structure is disposed at the center.

Permanent magnets 2 are placed at both ends of the anode cylinder 1, and constitute an internal magnet type magnetron.

3 is a heat sink formed around the anode cylinder 1;
It functions to receive cooling air from a cooling port (not shown) and release heat generated inside the anode cylinder 1 to the outside.

4 and 5 are rectangular yokes that surround the permanent magnet 2 and the heat sink 3 to form a magnetic path, and a cavity 6 is formed on the side of the permanent magnet 2.

7 is a filter, 8 is an antenna, and 9 is a rectangular duct that prevents cooling air from passing through the cavity 6 and the permanent magnet 2, and is usually welded to the front surface of the cooling port side of the yokes 4 and 5. It is located in

Therefore, by arranging this duct 9, the cooling air (not shown) is not guided toward the cavity 6 and the permanent magnet 2, which have low air resistance, but is guided toward the high heat sink 3. Therefore, the heat sink 3 can efficiently exhibit a cooling effect.

However, in the conventional magnetron having such a configuration, the duct 9 must be formed into a rectangular shape separately, which is disadvantageous in processing, and it must be fixed by welding, making assembly work complicated. This severely hindered mass production.

Therefore, an object of the present invention is to provide a magnetron that can eliminate the need for separately forming and welding the duct, which will be described in detail below using examples.

FIG. 2 is a simplified configuration diagram showing an embodiment of the magnetron according to the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals.

In the figure, 20 is the yoke 4°5 as shown in Fig. 3.
A tongue piece 21 protruding from a portion corresponding to the cavity 6 of the yokes 4 and 5 is a bent portion formed by bending it inward (in the direction of the arrow) at a nearly right angle, and is formed on the rear surfaces of the yokes 4 and 5.

The area of the new curved portion 20 is set to a sufficient area to block the ventilation of the hollow portion 6, and the cooling air from the cooling port (not shown) is blocked by the bent portion 20 and the permanent magnet 2. Ru.

Therefore, the cooling air is guided toward the heat sink 3, improving the cooling effect.

In addition, since the bent portion 20 is integrated with the yokes 4.5, it can be formed during the processing of the yokes 4 and 5, making processing easier.Furthermore, it can be easily assembled by simply bending and no welding is required. Improves work efficiency.

FIG. 4 is a simplified configuration diagram showing another embodiment of the magnetron according to the present invention, and this figure shows the yokes 4 and 5 viewed from the outside.

The difference in this figure from FIG. 3 is that the bent portion 20 is
, 5 is formed not at the end but in the middle.

The bent portion 20 may be formed, for example, by punching out the old parts 4 and 5 at once from the middle using a press so that they are exposed on the side of the cavity 6.

In this case, the new curved portion 20 is bent so that the punched hole is positioned behind the bent portion 20 with respect to the direction of the cooling air so that the cooling air does not pass through the punched hole of the yoke.

By doing this, it is possible to prevent cooling air from flowing from the cavity 6 as shown in Fig. 3, and it is not necessary to form a separate duct 9, making the processing easier.Furthermore, since no welding is required, assembly work is facilitated. will improve.

Here, in this embodiment, the bent portion 20 in FIG. 2 is formed at the rear of the yokes 4 and 5, that is, on the side opposite to the side where the direct cooling air hits, but the present invention is not limited to this. It may also be formed on the front surface of the yokes 4 and 5, which are in contact with the yokes 4 and 5.

Of course, in order for the cooling air to directly hit the permanent magnet as well as the heat sink, the bent portion 20 is installed in a hollow portion 6 surrounded by the permanent magnet 2, the heat sink 3, and the corners of the yokes 4 and 5. Ru.

Further, the area of the new song section 20 is not limited to the same as the ventilation area of the cavity section 6, but may be a small area with some margin, or may have circular holes, slits, etc.

In short, any size and shape may be used as long as they have air resistance that allows the new curved portion 20 to guide cooling air toward the permanent magnet 2 and the heat sink 3.

Further, in this embodiment, this bent portion 20 is
Although the tongue pieces 21 extending from the filter side or the antenna side of the yokes 4 and 5 have been described as being formed by bending them, the present invention is not limited thereto. It may be.

As explained above, according to the magnetron of the present invention, the tongue piece integrally formed on the yoke projects into the cavity to form a bent part, which blocks ventilation in the cavity and directs cooling air to the permanent magnet. Since the heat sink is effectively guided to the heat dissipation plate side, cooling efficiency is improved, and since no duct is required, processing is simplified, and the workability of assembly is improved, which has great effects.

[Brief explanation of the drawing]

Figure 1 is a simplified configuration diagram showing an example of a conventional magnetron.
2 to 4 are simplified configuration diagrams showing embodiments of the magnetron according to the present invention. 1...Anode cylinder, 2...Permanent magnet, 3...
Heat sink, 4, 5... Yoke, 6... Cavity, 7
... Filter, 8 ... Antenna, 9 ... Duct, 20 ... Bent part.

Claims (1)

[Claims] 1 an anode cylinder having a negative electrode structure and a pane inside;
A permanent magnet arranged at almost both ends of the anode cylinder, a plurality of heat sinks arranged around the anode cylinder, a yoke forming a magnetic path of the permanent magnet, and a corner of the yoke and the permanent magnet arranged around the anode cylinder. A magnetron having a cavity formed by being surrounded by a side part of a magnet and a side part of the heat sink, obtained by bending a tongue piece formed in the yoke to a size that almost closes the cavity part. A magnetron characterized in that the bending portion blocks the cooling air passing through the cavity to increase the cooling air flowing to the permanent magnet and the heat sink.