JP3379463B2 - Magnetron equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced air cooling type magnetron device used for microwave heating of a microwave oven or the like.

[0002]

2. Description of the Related Art In a conventional magnetron device, as shown in FIGS. 7 and 8, each of a plurality of rectangular heat radiating plates 2 mounted in multiple stages on a cylindrical anode body 1 of a magnetron and exposed to an air-cooling air flow. , A circular hole 5 having a collar 4 for press-fitting the tubular anode body 1 in the center thereof, and opposing sides 6a, 6b of the heat dissipation plate 2 are provided for pressure contact with the side wall of the frame yoke 7. It has side edges 8 and 9 formed in a shape.
Further, in order to disperse heat in a wide area of the surface of the frame yoke 7 and improve the heat radiation effect, the side edge portions 8 and 9 are divided into three in a tongue shape, and are located closest to the circular hole 5. The tongue-shaped first side edge portions 8a and 9a are bent in the Y-axis direction of the tubular anode body 1, and the tongue-shaped second edge portions 8a and 9a sandwich the first side edge portions 8a and 9a.
The side edge portions 8b and 9b and the third side edge portions 8c and 9c have concave portions 8d and 9d.

[0003]

However, in the magnetron device, in the assembly process, when the cylindrical anode body 1 is press-fitted into the circular hole 5 with the collar 4, press-fitting distortion is generated in the heat dissipation plate 2, Particularly, since the tips of the first side edge portions 8a, 9a located closest to the circular hole 5 fall in the axial Y direction, the first side edge portion 8a is formed on the side wall of the frame yoke 7 as shown in FIG. , 9a, the contact state of the tips of the first side edge portions 8a, 9a with respect to the side wall of the frame yoke 7 does not become surface contact. As a result, the first side edge portion 8 with respect to the frame yoke 7
The contact state of the tips of a and 9a becomes insufficient, the heat quantity of the cylindrical anode body 1 transmitted to the frame yoke 7 through the heat dissipation plate 2 is small, and the heat radiation becomes large, and the output of the magnetron decreases and fluctuates. There was a problem.

The present invention has been made in view of the above point, and provides a magnetron device capable of preventing the output of the magnetron from being lowered or fluctuated by improving the contact state of the radiator plate with the frame yoke. To do.

[0005]

According to the magnetron device of the present invention, each of a plurality of rectangular heat radiating plates, which are mounted in multiple stages on a cylindrical anode body of a magnetron and exposed to an air-cooling airflow, have the above-mentioned cylinder at the center thereof. In a magnetron device having a circular hole with a collar for press-fitting a cylindrical anode body and side edges for opposing sides of the heat dissipation plate to press-contact with a side wall of the frame yoke, the side edge The portion is divided into three or more in a tongue shape, and the tongue-shaped first side edge portion at the position closest to the center of the circular hole is bent in the axial center direction of the tubular anode body, The tip of the first side edge is the frame-shaped yoke.
Of it formed on the side wall and substantially parallel to the folded and planar, and connected by the ribs and at least one of the first side edge and the tongue-shaped second and third side edge of sandwiching the said First
The tip of the side edge should be in surface contact with the side wall of the frame yoke.
A, it is prevented from falling in the axis direction of the first side edge portion.

With this structure, the rigidity of the first side edge portion is increased, so that it is possible to prevent the tip of the first side edge portion from falling when the cylindrical anode body is press-fitted into the circular hole with collar. .

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) As shown in FIG. 2, a magnetron device of a first embodiment of the present invention is provided with a cylindrical anode body 10 and above and below the cylindrical anode body 10. Permanent magnets 12 and 13, and a plurality of heat radiating plates 14 attached to the outer periphery of the cylindrical anode body 10 in multiple stages and exposed to an air-cooling air flow,
It is provided with frame-shaped yokes 15 and 16 for forming a magnetic circuit, and an antenna output unit 17.

As shown in FIG. 1, the heat dissipation plate 14 is a thin plate made of aluminum or aluminum alloy formed into a rectangular shape by, for example, press molding, and a collar 18 for press-fitting the tubular anode body 10 in the center thereof. Circular hole 1 with
9 and side edges 22 and 23 for opposing sides 20 and 21 of the heat dissipation plate 14 to press against the side wall of the frame yoke 15.

The side edge portions 22 and 23 are divided into three tongue-like portions,
For example, the tongue-shaped first side edge portions 22a and 23a which are divided into three and are located closest to the center of the circular hole 19 are bent in the axial Y direction of the tubular anode body 10, for example, toward the collar 18 side. , The tip portions of the first side edge portions 22a and 23a are frame-shaped yokes 1
5 is formed in a flat shape so as to come into surface contact with the side wall of No. 5.

Tongue-shaped second side edge portions 22b and 23b and third side edge portions 22c and 23 sandwiching the first side edge portions 22a and 23a.
c has concave portions 24 and 25 with respect to the heat radiating plate surface 14a in order to increase the heat radiating area, and the tip portion thereof has a frame-shaped yoke 15
Is formed in a "U" shape so as to be in contact with the side wall of the frame-shaped yoke 15 and to be easily inserted into the side wall of the frame yoke 15. Then, the intermediate portion 26 of the first side edge portions 22a and 23a, and the second side edge portion 22
b, 23b and the intermediate portion 28 and the intermediate portion 29 of the third side edge portions 22c, 23c are connected by the ribs 30 and 31 to prevent the first side edge portions 22a, 23a from falling in the Y axis direction. ing.

Although the heat dissipation plate 14 has been described as having the concave portions 24 and 25, the present invention is not limited to this, and the concave portions 24 and 25 are not limited thereto.
The shape without 25 may be used.

Further, the second side edge portions 22b, 23b and the third side edge portions 22c, 23c have been described with the tips formed in a "U" shape, but the invention is not limited to this, and the first side edge portions are not limited thereto. Part 22
It may be formed in the same planar shape as the tip portions of a and 23a.

The axis Y of the first side edge portions 22a and 23a
In order to prevent the falling in the direction, the first side edge portion 22
Although the ribs 30 and the ribs 31 are provided on both sides of the a and 23a, the present invention is not limited to this, and the ribs 30 or the ribs 31 may be provided on one side of the first side edge portions 22a and 23a.

Next, the function and effect of the first embodiment of the present invention will be described.

In the magnetron device according to the first embodiment of the present invention, the ribs 30 have first side edge portions 22a, 23a, second side edge portions 22b, 23b and third side edge portions 22c, 23c sandwiching the first side edge portions 22a, 23a. , 31 so that the rigidity of the first side edge portions 22a, 23a is high, the first side edge portion 22 generated when the tubular anode body 10 is press-fitted into the circular hole 19 is formed.
The contact state of the tip end portions of the a and 23a in the axial Y direction makes a surface contact, the heat dissipation effect is improved, and the output of the magnetron can be prevented from decreasing and fluctuating.

Further, the tongue-shaped second side edge portions 22b and 23b and the third side edge portion 22 sandwiching the first side edge portions 22a and 23a.
Since the cross sections of c and 23c have the concave portions 25 and 26, the heat radiation area of the heat radiation plate 14 is increased, so that the heat radiation effect is further improved and the output of the magnetron can be prevented from decreasing.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention.
This embodiment is different from the first embodiment in that the heat dissipation plate surface 14a on the side 32, 33 side orthogonal to the side 20, 21 having the side edge portions 22, 23 is cylindrical. The difference is that the anode body 10 is bent in the Y-axis direction, for example, one direction on the collar 18 side, for example, at a predetermined angle θ1.

According to this embodiment, the heat dissipation plate surface 14a
Is bent in one direction on the collar 18 side, the rigidity of the radiator plate surface 14a is further increased, and the first side edge generated when the cylindrical anode body 10 is press-fitted into the circular hole 19 with the collar 18 is formed. It is possible to further prevent the tips of the portions 22a and 23a from collapsing. In addition, the heat sink surface 14a has a predetermined angle θ1.
The air-cooled airflow becomes a turbulent flow in the bent portion, and the heat dissipation effect can be improved.

Although the heat dissipation plate surface 14a on the sides 32 and 33 side is bent in one direction on the collar 18 side, the invention is not limited to this, and as shown in FIG. The heat radiating plate surface 14a is divided into a plurality of tongue shapes, for example, three, and the fifth side edge portion sandwiches the tongue-shaped fourth side edge portions 32a and 33a located at the position closest to the center of the circular hole 19. 32
b and the sixth side edge portion 33c to the collar 18 side, and the fifth side edge portion 33c.
The side edge portion 33b and the sixth side edge portion 32c may be respectively bent in the direction opposite to the collar 18 side. In the embodiment shown in FIG. 4, especially the fifth side edge portion 32b and the sixth side edge portion 32b
The air-cooling airflow becomes a turbulent flow at the portion of the side edge portion 33c bent at a predetermined angle θ2, and the heat radiation effect can be improved.

[0021]

EXAMPLES Next, examples for confirming the effects of the present invention will be described.

The magnetron device according to the first embodiment of the present invention shown in FIG. 2 has a rating of 900 W and, as shown in FIG. 1, an intermediate portion 26 of the first side edge portions 22a, 23a.
And the second side edge portions 22b and 23b and the third side edge portion 22.
The heat dissipation plate 14 in which the intermediate portions 28 and 29 of c and 23c are connected by the ribs 30 and 31 is used (hereinafter, referred to as “invention product 1”).

Further, instead of the heat dissipation plate 14 shown in FIG.
1 is used, that is, in addition to the shape of the heat sink 14 shown in FIG. 1, the side 2 having side edge portions 22 and 23 is used.
The heat radiating plate surface 14a on the sides 32, 33 side orthogonal to 0, 21 is bent in the axial Y direction of the cylindrical anode body 10, for example, one direction on the collar 18 side, and other specifications are described above. A similar magnetron device was also manufactured (hereinafter referred to as "invention product 2").

For comparison with these, the heat sink 2 shown in FIG. 7 is used, that is, the rib 3 of the heat sink 14 shown in FIG.
A magnetron device having the other specifications similar to those of the first embodiment of the present invention was also manufactured (hereinafter, referred to as "conventional product").

Subsequently, with respect to the products 1 and 2 of the present invention and the conventional product, the temperature and the magnetron output of the tubular anode body 10 when the number of samples was 90 were examined, and the following results were obtained. FIG. 5 shows the temperature distribution of the cylindrical anode body 10, and FIG.
Shows the magnetron output distribution. In each figure, A indicates the product 1 of the present invention, B indicates the product 2 of the present invention, and C indicates the conventional product.

As shown in FIG. 5, the average temperature of the tubular anode body 10 was 234.6 ° C. for the product 1 of the present invention and 22 for the product 2 of the present invention.
While it was 3.6 ° C, the conventional product had a temperature of 257 ° C. Therefore, it is understood that the products 1 and 2 of the present invention can reduce the temperature rise of the tubular anode body 10 by about 10% as compared with the conventional products. Further, the temperature variation of the tubular anode body 10 was 232 to 238 ° C. (6 ° C.) for the product 1 of the present invention and 221 to 226 ° C. (5 ° C.) for the product 2 of the present invention. Was 262 ° C (12 ° C). Therefore, the products 1 and 2 of the present invention have a cylindrical anode body 10 as compared with the conventional products.
It can be seen that the temperature variation can be reduced to about 1/2.

As shown in FIG. 6, the average value of the magnetron output is 889.6 W for the product 1 of the present invention and 89 for the product 2 of the present invention.
While it was 6.3 W, the conventional product was 879.3 W. That is, the present invention products 1 and 2 are
It can be seen that the magnetron output can be increased by about 10 W or more. In addition, the variation of the magnetron output is the product 1 of the present invention.
Is 887 to 892 W (5 W), the product of the present invention 2 is 894 to 8
It was 99W (5W), whereas the conventional product was 873-8
It was 85 W (12 W). Therefore, the present invention product 1,
It can be seen that No. 2 can reduce the variation of the magnetron output to about 1/2 as compared with the conventional product.

[0028]

As described above, according to the present invention, each of a plurality of rectangular heat radiating plates, which are attached to a cylindrical anode body of a magnetron in multiple stages and exposed to an air-cooling air flow, have the cylindrical shape at the center thereof. A magnetron device having a circular hole with a collar for press-fitting an anode body and a side edge portion for opposing sides of the heat dissipation plate to press-contact with a side wall of a frame yoke, wherein the side edge portion is divided in three or more tongues, first side edge portion and the tongue in closest position to the center of the circular hole is bent in the axial direction of the tubular anode body, said The tip of the first side edge is substantially the same as the side wall of the frame yoke.
The frame is bent in parallel and is formed in a plane shape, and the first side edge portion and at least one of the tongue-shaped second and third side edge portions that sandwich the first side edge portion are connected by a rib, whereby the frame is formed. It is possible to prevent the tip end portion of the first side edge portion from coming into contact with the side wall of the linear yoke to become a surface contact, improve the heat radiation effect, and prevent the output of the magnetron from decreasing and fluctuating.

[Brief description of drawings]

FIG. 1 is a perspective view showing a heat dissipation plate used in a magnetron device according to a first embodiment of the present invention.

FIG. 2 is a front view showing the magnetron device.

FIG. 3 is a perspective view showing a heat dissipation plate used in the magnetron device according to the second embodiment of the present invention.

FIG. 4 is a perspective view showing an application example of a heat dissipation plate used in the magnetron device.

FIG. 5 is a comparative diagram showing the temperature distribution of the tubular anode body 10.

FIG. 6 is a comparative diagram showing a magnetron output distribution.

FIG. 7 is a perspective view showing a heat dissipation plate used in a conventional magnetron device.

FIG. 8 is a side view showing a main part of a conventional magnetron device.

[Explanation of symbols]

10 Cylindrical anode body 14 Heat sink 15, 16 frame-shaped yoke 19 circular holes 22, 23 Side edge 22a, 23a First side edge 22b, 23b Second side edge 22c, 23c Third side edge 30, 31 ribs

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-3-184234 (JP, A) Actually opened 54-44676 (JP, U) Actually opened 64-64545 (JP, U) Actually opened 54- 101961 (JP, U) Actually opened 54-83856 (JP, U) Actually opened 50-108349 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 23/00

Claims (2)

(57) [Claims] 1. A plurality of rectangular heat radiating plates, which are attached to a cylindrical anode body of a magnetron in multiple stages and exposed to an air-cooling airflow, each have a circular shape with a collar for press-fitting the cylindrical anode body into the center thereof. In a magnetron device having a hole and a side edge portion for opposing sides of the heat dissipation plate to come into pressure contact with a side wall of the frame yoke, the side edge portion is divided into three or more tongue-shaped portions. And, the tongue-shaped first side edge portion at the position closest to the center of the circular hole is bent in the axial direction of the tubular anode body, and the tip portion of the first side edge portion is the
Formed into a flat shape by bending it in parallel with the side wall of the frame yoke.
And connecting the first side edge portion and at least one of the tongue-shaped second and third side edge portions sandwiching the first side edge portion by a rib,
The tip portion of the first side edge portion is in surface contact with the side wall of the frame yoke.
As described above, the magnetron device is configured to prevent the first side edge portion from falling in the axial direction. 2. The magnetron device according to claim 1, wherein the surface of the heat dissipation plate on the side orthogonal to the side having the side edge portion is bent in the axial direction of the tubular anode body.