阅读说明：本技术 磁控管和具备该磁控管的微波加热装置 (Magnetron and microwave heating device provided with same ) 是由 石井健 金田克彦 水野雄一 于 2018-06-28 设计创作，主要内容包括：本方式的磁控管具有磁路,所述磁路由永磁体(13、14)以及将第一磁轭(15)和第二磁轭(16)接合起来而构成的磁轭构成,通过一体地设置于第一磁轭(15)和第二磁轭(16)中的至少一方的接合部(201)的塑性变形将第一磁轭(15)和第二磁轭(16)接合起来。根据本方式,能够避免将部件更换为非正品的部件等以制造商保证的范围外的方法使用磁控管。由此,能够抑制不稳定动作,并防止寿命缩短。其结果是,能够提供若不破坏部件就无法拆卸的、可靠性高的磁控管。(The magnetron of the present embodiment has a magnetic circuit including permanent magnets (13, 14) and a yoke formed by joining a first yoke (15) and a second yoke (16), wherein the first yoke (15) and the second yoke (16) are joined by plastic deformation of a joining section (201) provided integrally with at least one of the first yoke (15) and the second yoke (16). According to this aspect, it is possible to avoid using a magnetron in a method outside the range guaranteed by the manufacturer, such as replacing a component with a non-genuine component. This can suppress unstable operation and prevent the life from being shortened. As a result, a magnetron which cannot be detached without breaking the members and which is highly reliable can be provided.)

1. A magnetron having a magnetic circuit constituted by a permanent magnet and a yoke constituted by joining a first yoke and a second yoke, wherein,

the first yoke and the second yoke are joined together by plastic deformation of a joining portion integrally provided to at least one of the first yoke and the second yoke.

2. The magnetron of claim 1,

the first yoke and the second yoke are joined by pressing.

3. The magnetron of claim 1,

the first yoke has a claw portion as the engaging portion,

the second yoke has a hole portion,

the claw portion is bent by pressing, and the claw portion is engaged with the hole portion.

4. The magnetron of claim 1,

the first yoke has a claw portion as the engaging portion,

the claw part is provided with a clamping protrusion,

the second yoke has a hole and an engaging portion provided in the hole,

the claw portion is bent by pressing, and the engaging protrusion engages with the engaging portion.

5. A microwave heating apparatus comprising the magnetron according to claim 1.

Technical Field

The present invention relates to a magnetron which is not easy to be disassembled and a microwave heating device with the magnetron.

Background

Conventionally, when the structure of a magnetron as a microwave generating apparatus is classified from a functional aspect, the magnetron is composed of a magnetic circuit portion, a cooling circuit portion, an LC filter circuit portion, and a core tube. The core tube is composed of an upper case having an antenna portion, an anode portion and a cathode portion.

The magnetron is an electron tube that converts direct current energy applied between an anode portion and a cathode portion into high frequency energy by electron movement in an action space between the anode and the cathode, in which orthogonal electrostatic magnetic fields are formed, and generates microwaves. Because of high oscillation efficiency and easy realization of a large output, magnetrons are widely used as microwave generators for microwave heating devices such as microwave ovens (see, for example, patent document 1).

Fig. 6 is a perspective view of a conventional magnetron. Fig. 7 is a sectional view of a core tube of a conventional magnetron. Fig. 8 is a sectional view of an exterior member of the conventional magnetron except for a core tube.

In these figures, the core tube 19 of a typical magnetron is formed by vacuum sealing. A coiled filament 1 is disposed in the center of the cathode of the magnetron. The filament 1 is supported by a center lead 4 and side leads 5. The center lead 4 is connected to the side leads 5 via end caps 2 and 3 provided at both ends of the filament 1.

The anode part of the magnetron includes an anode cylinder 6 and an even number of vanes 7, and the even number of vanes 7 are provided so as to protrude from the inner peripheral surface of the anode cylinder 6 toward the filament 1. The blade 7 is provided to maintain a prescribed interval from the filament 1. A cavity resonator 8 is formed between the vane 7 and the inner peripheral wall surface of the anode cylinder 6.

A pair of magnetic pole portions 9 and 10 having substantially the same shape and a mortar shape are disposed so as to face each other at both ends of the anode cylinder 6 in the tube axis direction. The input unit 12 is provided outside the end of the magnetic pole unit 9 in the tube axis direction, and supplies heating power and a high voltage for magnetron driving to the filament 1. The output unit 11 is provided outside the end of the magnetic pole unit 10 in the pipe axis direction, and emits microwaves generated in the anode. The core tube 19 covered with the vacuum wall is composed of the output portion 11 and the input portion 12.

Next, the exterior member other than the core tube 19 will be explained. One magnetic pole surface of the pair of annular permanent magnets 13, 14 is magnetically coupled to the magnetic pole portions 9, 10. The other magnetic pole faces of the pair of annular permanent magnets 13 and 14 are magnetically coupled to the frame- shaped yokes 15 and 16. Thereby constituting a magnetic circuit. The frame- shaped yokes 15 and 16 are made of a ferromagnetic material and have a square cross-sectional shape.

As a result, a dc magnetic field is supplied to the electron movement space 17 formed between the filament 1 and the blade 7.

In the magnetron, the filament 1 is heated, and a predetermined high dc voltage is applied between the filament 1 and the vanes 7, whereby electrons are emitted from the filament 1 toward the vanes 7.

The electrons are subjected to orthogonal electromagnetic fields in the electron motion space 17 between the filament 1 and the blade 7. The electrons circulate around the filament 1 while revolving around, and face the vanes 7. The electrons and the 2,450MH generated by the cavity resonator 8 in the divided blade 7_ZThe weak microwaves of the band interact with each other to generate a larger microwave in the cavity resonator 8.

The microwave generated in the cavity resonator 8 is transmitted through the antenna lead 18 electrically coupled to one of the vanes 7, and is radiated into the heating chamber of the microwave oven through the output portion 11.

Disclosure of Invention

In the above-described conventional structure, the components other than the core tube 19 can be used semi-permanently. Therefore, the magnetron can be removed and the core tube 19 can be replaced by a simple operation such as removing the screw 21. Therefore, the magnetron is sometimes used in a method out of the range guaranteed by the manufacturer by replacing the component with a non-genuine component or the like. This causes unstable operation and shortens the life.

The invention aims to provide a magnetron which can not be disassembled without damaging components and has high reliability.

A magnetron of the present invention has a magnetic circuit constituted by a permanent magnet and a yoke constituted by joining a first yoke and a second yoke. In the magnetron of the present invention, the first yoke and the second yoke are joined by plastic deformation of a joining portion integrally provided at least one of the first yoke and the second yoke.

According to the present invention, it is possible to avoid using a magnetron in a method outside the range guaranteed by the manufacturer by replacing a component with a non-genuine component or the like. This can suppress unstable operation and prevent a reduction in life. As a result, a magnetron which cannot be detached without breaking the members and which is highly reliable can be provided.

Drawings

Fig. 1 is a perspective view of a magnetron according to a first embodiment of the present invention.

Fig. 2 is a sectional view of an exterior member of a magnetron according to the first embodiment except for a core tube.

Fig. 3 is a partially enlarged view of the magnetron according to the first embodiment before bending the claw portion of the input side frame-shaped yoke.

Fig. 4A is a partially enlarged view of the magnetron according to the first embodiment, in which the claw portion of the input-side frame-shaped yoke is bent and viewed from the outside.

Fig. 4B is a partially enlarged view of the magnetron according to the first embodiment, in which the claw portion of the input-side frame-shaped yoke is bent and viewed from the inside.

Fig. 5 is a partially enlarged view of a yoke of a magnetron according to a second embodiment of the present invention.

Fig. 6 is a perspective view of a conventional magnetron.

Fig. 7 is a sectional view of a core tube of a conventional magnetron.

Fig. 8 is a sectional view of an exterior member of the conventional magnetron except for a core tube.

Detailed Description

A magnetron of a first aspect of the present invention has a magnetic circuit constituted by a permanent magnet and a yoke constituted by joining a first yoke and a second yoke. In the magnetron of the present aspect, the first yoke and the second yoke are joined together by plastic deformation of a joining portion integrally provided to at least one of the first yoke and the second yoke.

According to a magnetron of a second aspect of the present invention, on the basis of the first aspect, the first yoke and the second yoke are joined by pressing.

According to a magnetron of a third aspect of the present invention, in the magnetron of the first aspect, the first yoke has a claw portion as the engaging portion. The second yoke has a hole portion. The claw portion is bent by pressing, and the claw portion is engaged with the hole portion.

According to a magnetron of a fourth aspect of the present invention, in the magnetron of the first aspect, the first yoke has a claw portion as the engaging portion. The claw portion has an engaging projection. The second yoke has a hole and an engaging portion provided in the hole. The claw portion is bent by pressing, and the engaging protrusion is engaged with the engaging portion.

A fifth aspect of the present invention is a microwave heating apparatus including the magnetron of the first aspect.

Embodiments of the present invention will be described below with reference to the drawings.

(embodiment I)

Fig. 1 is a perspective view of a magnetron according to a first embodiment of the present invention. Fig. 2 is a sectional view of an exterior member of the magnetron of the present embodiment except for the core tube. Fig. 3 is a partially enlarged view of the magnetron according to the present embodiment before bending the claw portion of the input side frame-shaped yoke.

Fig. 4A is a partially enlarged view of the magnetron of the present embodiment, as viewed from the outside with the pawl portion of the input-side frame-shaped yoke bent. Fig. 4B is a partially enlarged view of the magnetron of the present embodiment, in which the claw portion of the input-side frame-shaped yoke is bent and viewed from the inside.

As shown in fig. 1 and 2, the frame-shaped yoke 15 is arranged to have a U-shape in cross section. The frame yoke 16 is arranged to have an inverted U-shape in cross section.

The frame yoke 15 and the frame yoke 16 are arranged such that their ends overlap. In this state, the frame-shaped yoke 15 and the frame-shaped yoke 16 are combined to form a cylindrical frame-shaped yoke having a square cross section. In the present embodiment, the frame-shaped yokes 15 and 16 correspond to a first yoke and a second yoke, respectively.

As shown in fig. 3, notch portions 151 are formed at substantially the center of both end portions of the frame-shaped yoke 15. In the notch 151, a protruding claw portion 201 is formed integrally with the frame-shaped yoke 15. A hook-shaped engaging projection 202 is formed on the distal end portion of the pawl portion 201. In the present embodiment, the claw portion 201 corresponds to a joint portion.

As shown in fig. 1 and 3, hole portions 161 are formed substantially at the center of both end portions of the frame-shaped yoke 16. As shown in fig. 4A and 4B, the hole 161 is provided to face the claw portion 201 of the frame-shaped yoke 15. Since the engaging portion 162 is formed in the hole 161, the hole 161 has a substantially L-shape.

When the magnetron is assembled, the ring-shaped permanent magnet 13 is placed in the inner center portion of the frame-shaped yoke 15 so as to surround the hole formed in the frame-shaped yoke 15. The input side of the assembled core tube 19 is inserted into the annular permanent magnet 13 and the frame-shaped yoke 15. The output side of the core tube 19 is inserted into the annular permanent magnet 14 and the frame-shaped yoke 16. The frame-shaped yoke 15 and the frame-shaped yoke 16 are combined by riveting rivets at the overlapping portions of the frame-shaped yokes 15 and 16, thereby forming a cylindrical frame-shaped yoke having a square cross section.

The claw portion 201 is bent by about 90 ° in the direction of the hole 161 by pressing, and engages with the peripheral edge portion of the hole 161. When the claw portion 201 of the frame-shaped yoke 15 is engaged with the hole portion 161 of the frame-shaped yoke 16 and the frame-shaped yokes 15 and 16 are fixed, the magnetron cannot be detached.

In the present embodiment, the bending angle of the claw portion 201 is about 90 °. When the bending angle is 90 ° or more, the frame-shaped yokes 15 and 16 are reliably engaged.

In this way, in the present embodiment, the frame-shaped yoke 15 and the frame-shaped yoke 16 are joined by plastic deformation (pressing) of the claw portion 201 (joining portion) integrally provided to at least one of the frame-shaped yoke 15 and the frame-shaped yoke 16.

In the present embodiment, a hook-shaped engaging protrusion 202 is formed on a distal end portion of the pawl portion 201. In other words, the engaging projection 202 has an L-shape. However, the claw portion 201 may have a T-shape. In this case, two engaging portions 162 may be formed in the hole 161.

In the present embodiment, a rivet is driven into the overlapping portion of the frame-shaped yokes 15 and 16, and the frame-shaped yoke 15 and the frame-shaped yoke 16 are fixed. However, the present invention is not limited to this, and the frame-shaped yoke 15 and the frame-shaped yoke 16 may be fixed by tapping screws, for example.

As described above, according to the present embodiment, it is possible to avoid using a magnetron in a method outside the range guaranteed by the manufacturer, such as replacing a component with a non-genuine component. This can suppress unstable operation and prevent a reduction in life. As a result, a magnetron which cannot be detached without breaking the members and which is highly reliable can be provided.

(second embodiment)

Next, a second embodiment of the present invention will be described. In the following description, the same or corresponding portions as those in the first embodiment are denoted by the same reference numerals, and redundant description thereof is omitted.

Fig. 5 is a partially enlarged view of a yoke of the magnetron according to the present embodiment. The present embodiment is the same as the first embodiment in that the claw portions 203 are bent to engage with the hole portions 163. However, the present embodiment is different from the first embodiment in the following point.

As shown in fig. 5, in the present embodiment, engagement projection 202 is not provided in claw portion 203, and engagement portion 162 is not provided in hole portion 163. In the present embodiment, the claw portion 203 is preferably bent by 90 ° or more and fastened.

As described above, according to the present embodiment, it is possible to avoid using a magnetron in a method outside the range guaranteed by the manufacturer, such as replacing a component with a non-genuine component. This can suppress unstable operation and prevent a reduction in life. As a result, a magnetron which cannot be detached without breaking the members and which is highly reliable can be provided.

Industrial applicability

The invention can be applied to magnetrons.

Description of the reference symbols

1: a filament;

2. 3: an end cap;

4: a center lead;

5: a side lead;

6: an anode cylinder;

7: a blade;

8: a cavity resonator;

9. 10: a magnetic pole portion;

11: an output section;

12: an input section;

13. 14: an annular permanent magnet;

15. 16: a frame-shaped magnetic yoke;

17: an electron motion space;

18: an antenna lead;

19: a core tube;

21: a screw;

151: a notch portion;

161. 163: a hole portion;

162: a fastening part;

201. 203: a claw portion;

202: and a snap-fit protrusion.