JP2002163994A - Magnetron and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high quality magnetron wherein a performance of a hard soldering part is improved. SOLUTION: A sealing metal 9 is arranged at an inner side soldering jig 23, a vacuum sealing member 22 of a lower part made of cylindrical silver solder is mounted on the sealing metal 9 placing a part (b) faced upward, and the sealing metal 9 is internally contacted and arranged at an inner side of a part (a). Further, a lower part of an insulating tube body 12 is circumscribed and mounted at an outer side of the part (b) so as to fix a position relationship between the sealing metal 9 and the insulating tube body 12. Next, the vacuum sealing member 22 of an upper part is mounted on an upper part of the insulating tube part 12 placing the a part faced upward, the upper part of the insulating tube body 12 is circumscribed and arranged at the outer side of the part (b), and further, a lower part of an exhaust pipe 11 is internally contacted and mounted at an inner side of a part (A) so as to fix a position relationship between the insulating tube body 12 and the exhaust pipe 11. Then, after an outer side soldering jig 24 is arranged from an outside of the sealing metal 9 up to an outside of the insulating tube body 12 and a positioning of the members is performed, silver solder of the vacuum sealing member 22 is fused in a hydrogen furnace at temperatures between around 800 deg.C to 900 deg.C so that the members are mutually joined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetron used for microwave heating equipment such as a microwave oven, a radar, and the like, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a magnetron used for a microwave oven or the like has a structure as shown in a partially broken view in FIG. This configuration will be described below with reference to the drawings. 1 is a cylindrical anode body, 2 is a vane radially arranged on the inner peripheral surface of the anode body 1, 3 is a cathode disposed in a space surrounded by the tip of the vane 2, and 4 is a vane 2 The antenna conductors 5 and 6 connected to one of them are disposed on the upper surface and the lower surface of the vane 2, respectively. An inner strap ring and an outer strap ring for connecting every other vane 2 and 7, 8 are The pole pieces 9 and 10 made of a magnetic material and disposed at the upper and lower peripheries of the anode body 1 are sealing metals whose one ends are fixed to the upper and lower openings between the anode bodies 1.

An exhaust pipe 11 is connected at one end to a sealing metal (top shell) 9 via a ceramic insulating cylinder 12 and is surrounded by an antenna cap.
After exhausting the internal air through the antenna conductor 4, the other end is sealed off together with the antenna conductor 4. Reference numeral 13 denotes a cathode stem fixed to the sealing metal 10 and supports a cathode terminal 14 of the cathode body 3. The above constitutes a vacuum tube.

[0005] Reference numeral 15 denotes an annular magnet disposed above and below the anode cylinder 1, 16 denotes a plurality of heat sinks fixed to the outer peripheral surface of the anode cylinder 1, 17 denotes the anode cylinder 1, the magnet 15, and the heat radiation A yoke surrounding the plate 16, a shield case 18 surrounding the cathode stem 13 protruding from the yoke 17, 19 is housed in the shield case 18, and one end is a cathode terminal 14.
The choke coil 20 is connected to the other end of the choke coil 19 and is supported by the shield case 18.

FIG. 4 shows a detailed sectional view of the output section of the magnetron in this configuration, and FIG. 5 shows a vacuum sealing member. As shown in FIG. 4, a cylindrical sealing metal 9 connected to the opening of the cylindrical anode body, and an insulating cylinder connected to the opening of the sealing metal 9 via a vacuum sealing member 22 The body 12 and the exhaust pipe 11 connected to the insulating cylinder 12 via a vacuum sealing member 22. The vacuum sealing member 22 is formed of a uniform ring-shaped silver solder as shown in FIG. Have been.

[0006] The joining of such a vacuum sealed portion is performed as follows. First, an inner brazing jig 23 having a shape substantially conforming to the inner shape of the sealing metal 9, the inner shape of the insulating cylinder 12, and the inner shape of the exhaust pipe 11 is prepared, and the inner brazing jig 23 is sealed. The metallized metal 9 is arranged, the lower vacuum sealing member 22 made of a ring-shaped silver braze is placed thereon, the insulating cylinder 12 is placed thereon, and the upper part made of the ring-shaped silver braze is further placed thereon. Is mounted, and finally the exhaust pipe 11
Is placed.

After that, the outer brazing jig 24 is disposed from the outside of the sealing metal 9 to the outside of the insulating cylinder 12 to position the members.
The silver braze of the vacuum sealing member 22 is melted in a hydrogen furnace at a temperature of ° C. to join the members together.

Thus, the cylindrical sealing metal 9 is connected to the opening of the cylindrical anode body, and the insulating cylindrical body 12 is connected to the opening of the sealing metal 9 via the vacuum sealing member. A vacuum-sealed portion of the magnetron in which the exhaust pipe 11 is connected to the insulating cylinder 12 via the vacuum-sealing member is manufactured.

In addition, for example, Japanese Patent Application Laid-Open No. 63-2318
Japanese Patent Application Publication No. 40-204, discloses a silver solder that is melted by inserting and heating a silver solder cut by winding a silver brazing material into a ring-shaped step formed at a fitting portion between the exhaust pipe and the cup body. There is disclosed a brazing method in which the spread of the brazing is prevented beforehand.

[0010]

In the prior art, the members can be positioned to some extent by the inner brazing jig 23 and the outer brazing jig 24, but the dimensional tolerances and variations of the members and the brazing are also required. A slight center shift occurs due to a difference in thermal expansion due to a difference in material of the member at the time. When the center shift occurs, the joining strength of the brazed portion tends to decrease, and in the worst case, there is a possibility of destruction, and the function as a magnetron is impaired. In addition, if the center of the silver braze is shifted, the flow of the silver braze to a portion not necessary for brazing occurs, so that there is a problem that the brazing cannot be performed at an optimum volume and the quality is greatly affected. An object of the present invention is to solve such a problem and to provide a high quality magnetron with improved performance of a brazing portion.

[0011]

According to a first aspect of the present invention, there is provided a magnetron having a tubular anode body having a plurality of vanes and a tubular anode body connected to an opening of the anode body. Sealing metal, an insulating cylinder connected to the opening of the sealing metal via a vacuum sealing member, and an exhaust pipe connected to the insulating cylinder via a vacuum sealing member, A magnetron having an antenna conductor connected to one of the vanes and inserted into the exhaust pipe, wherein the vacuum sealing member is formed of a silver solder having a positioning function, and the vacuum sealing member is used for the vacuum sealing member. It was configured to be attached and joined.

[0012] The magnetron according to claim 2 of the present invention comprises:
A cylindrical anode body having a plurality of vanes, a cylindrical sealing metal connected to the opening of the anode body, and an insulating cylinder connected to the opening of the sealing metal via a vacuum sealing member Body, an exhaust pipe connected to the insulating cylinder via a vacuum sealing member, and a magnetron including an antenna conductor connected to one of the vanes and inserted into the exhaust pipe, The vacuum sealing member was formed into a stepped cylindrical shape with silver brazing having a positioning function, and brazed and joined by the vacuum sealing member.

[0013] The magnetron according to claim 3 of the present invention comprises:
A cylindrical anode body having a plurality of vanes, a cylindrical sealing metal connected to the opening of the anode body, and an insulating cylinder connected to the opening of the sealing metal via a vacuum sealing member Body, an exhaust pipe connected to the insulating cylinder via a vacuum sealing member, and a magnetron including an antenna conductor connected to one of the vanes and inserted into the exhaust pipe, The vacuum sealing member was formed into a stepped cylindrical shape with silver brazing having a positioning function, the side surface thereof was formed in a tapered shape, and brazed and joined by the vacuum sealing member.

Further, claim 4 or claim 5 of the present invention.
The magnetron according to claim 2, wherein the vacuum sealing member according to claim 2 or 3 is formed in a stepped cylindrical shape with a silver solder having a positioning function, or a side surface thereof is formed in a tapered shape, and silver is formed. Protrusions or cut-and-raised portions were provided on the side surfaces of the wax, and brazed by the vacuum sealing member.

In this way, the positioning of the members with the inner brazing jig and the outer brazing jig and the positioning function of the vacuum sealing member made of silver brazing allow the dimensional tolerance and variation of the members.
Further, even if there is a difference in thermal expansion due to a difference in material of the members at the time of brazing, it is possible to prevent the occurrence of center deviation. In addition, it is possible to prevent loss of function as a magnetron due to a decrease in the joining strength of the brazing part due to center displacement, and to prevent the flow of silver brazing to parts that are not necessary for brazing of silver brazing. Brazing becomes possible, and a high-quality magnetron with improved brazing performance can be obtained.

According to a sixth aspect of the present invention, there is provided the magnetron manufacturing method, wherein the inner brazing jig having a shape substantially conforming to the inner shape of the sealing metal, the inner shape of the insulating cylinder, and the inner shape of the exhaust pipe is provided. After mounting the metallized metal, a vacuum sealing member made of silver brazing having a positioning function, an insulating cylinder, a vacuum sealing member made of silver brazing having a positioning function, and an exhaust pipe in order, vacuum sealing made of silver brazing By melting the members and joining the members together, a cylindrical sealing metal is connected to the opening of the cylindrical anode body having a plurality of vanes, and an insulating cylinder is connected to the opening of the sealing metal. An exhaust pipe is connected to the insulating cylinder, and an antenna conductor inserted into the exhaust pipe is connected to one of the vanes.

According to a seventh aspect of the present invention, there is provided the magnetron manufacturing method, wherein the inner brazing jig having a shape substantially conforming to the inner shape of the sealing metal, the inner shape of the insulating cylinder, and the inner shape of the exhaust pipe is provided. A vacuum sealing member made of a cylindrical silver solder having a step having a positioning function, an insulating cylindrical body, a vacuum sealing member formed of a cylindrical silver solder having a step having a positioning function, and an exhaust pipe are sequentially placed. After mounting, a vacuum sealing member made of silver brazing is melted and the members are joined to connect a cylindrical sealing metal to the opening of the cylindrical anode body having a plurality of vanes. An insulating cylinder is connected to the opening of the metallized metal, an exhaust pipe is connected to the insulating cylinder, and an antenna conductor inserted into the exhaust pipe is connected to one of the vanes.

The method for manufacturing a magnetron according to claim 8 of the present invention is characterized in that the inner brazing jig having a shape substantially conforming to the inner shape of the sealing metal, the inner shape of the insulating cylinder, and the inner shape of the exhaust pipe is provided. Vacuum sealing member made of silver brazing metal having a stepped cylindrical side surface having a positioning function having a tapered shape, an insulating cylindrical body, and a stepped cylindrical side surface having a positioning function formed in a tapered shape. After the vacuum sealing member made of silver brazing and the exhaust pipe are sequentially placed, the vacuum sealing member made of silver brazing is melted and the members are joined to form an opening in the cylindrical anode body having a plurality of vanes. Connect the tubular sealing metal to the part,
An insulating cylinder was connected to the opening of the sealing metal, an exhaust pipe was connected to the insulating cylinder, and an antenna conductor inserted into the exhaust pipe was connected to one of the vanes.

Further, claim 9 or claim 1 of the present invention.
The method of manufacturing a magnetron according to claim 0, wherein the vacuum sealing member according to claim 7 or 8 is formed into a stepped cylindrical shape with silver brazing having a positioning function, or the side surface thereof is formed into a tapered shape. Further, a convex portion or a cut-and-raised portion is provided on the side surface of the silver solder, and brazing is joined by the vacuum sealing member.

In this way, the members are positioned by the inner brazing jig and the outer brazing jig, and by the positioning function of the vacuum sealing member made of silver braze, the dimensional tolerance and variation of the members are reduced.
Further, even if there is a difference in thermal expansion due to a difference in material of the members at the time of brazing, it is possible to prevent the occurrence of center deviation. In addition, it is possible to prevent loss of function as a magnetron due to a decrease in the joining strength of the brazing part due to center displacement, and to prevent the flow of silver brazing to parts that are not necessary for brazing of silver brazing. Brazing becomes possible, and it is possible to obtain a method for manufacturing a magnetron of high quality in which the performance of the brazing portion is improved.

[0021]

Embodiments of the present invention will be described below. The main configuration of the magnetron of the present invention has already been described with reference to FIG. FIG. 1 is a detailed sectional view of an output portion of the magnetron of the present invention, and FIG. 2 shows a vacuum sealing member made of silver solder having a positioning function. 1 and 2
, The same members as those in FIGS. 4 and 5 are denoted by the same reference numerals.

A vacuum sealing member made of silver solder having a positioning function and used for the magnetron of the present invention will be described with reference to FIG. The vacuum sealing member 22 made of silver brazing is composed of the parts a and b.
It is configured in a two-stage cylindrical shape, and the diameter of the part a is formed larger than the diameter of the part b.

A first embodiment of the present invention in which the vacuum sealing member 22 made of silver brazing as shown in FIG. 2 is applied to a magnetron will be described with reference to FIG. Joining of the vacuum sealing portion is performed as follows. First, the sealing metal 9
An inner brazing jig 23 having a shape substantially conforming to the inner shape of the insulating cylinder 12 and the inner shape of the exhaust pipe 11 is prepared.

The sealing metal 9 is placed on the inner brazing jig 23, and the lower part b of the vacuum sealing member 22 made of the cylindrical silver solder shown in FIG. The sealing metal 9 is inscribed inside. Also, the insulating cylinder 12 is provided outside the portion b.
Circumscribe the lower part of. Thereby, the positional relationship between the sealing metal 9 and the insulating cylinder 12 is fixed.

Next, the upper part of the vacuum sealing member 22 is placed on the upper part of the insulating cylinder 12 with the a part thereof facing upward, and the upper part of the insulating cylinder 12 is circumscribed outside the b part. The lower part of the exhaust pipe 11 is inscribed inside. Thereby, the positional relationship between the insulating cylinder 12 and the exhaust pipe 11 is fixed.

After that, the outer brazing jig 24 is disposed from the outside of the sealing metal 9 to the outside of the insulating tubular body 12 to position the members, and then the members are positioned at about 800 ° C. to 900 ° C.
The silver braze of the vacuum sealing member 22 is melted in a hydrogen furnace at a temperature of ° C. to join the members together.

Thus, the cylindrical sealing metal 9 is connected to the opening of the cylindrical anode body, and the insulating cylindrical body 12 is connected to the opening of the sealing metal 9 via the vacuum sealing member. A vacuum-sealed portion of the magnetron in which the exhaust pipe 11 is connected to the insulating cylinder 12 via the vacuum-sealing member is manufactured.

The members are positioned by the inner brazing jig 23 and the outer brazing jig 24, and the positioning function of the vacuum sealing member 22 made of silver solder is used. Even if there is a difference in thermal expansion due to a difference in the material of the member, the occurrence of center deviation can be prevented.

Further, loss of function as a magnetron due to a decrease in bonding strength of a brazed portion due to a center shift,
It is possible to prevent the flow of silver braze to parts that are not necessary for brazing silver braze, it is possible to braze with the optimal volume, and to obtain a high quality magnetron with improved brazing performance. it can.

The shape of the silver solder as the vacuum sealing member 22 is not limited to a stepped cylindrical shape.
As shown in (A), the side surfaces of the portions a and b of the silver solder may be formed in a tapered shape to press-fit each member. Further, as shown in FIG. 3 (B), a configuration may be adopted in which convex portions are provided on the inner side surface of the portion a of the silver solder and the outer side surface of the portion b, and each member is press-fitted and held at multiple points. Further, as shown in FIG. 3 (C), a cut-and-raised portion may be provided on the inner surface of the portion a of the silver solder and the outer surface of the portion b, and each member may be press-fitted and held at multiple points.

[0031]

As described above, according to the present invention, the dimensional tolerance and the variation of the members are determined by the function of positioning the members by the inner brazing jig and the outer brazing jig and the positioning function of the vacuum sealing member made of silver brazing. Further, even if there is a difference in thermal expansion due to a difference in material of the member at the time of brazing, it is possible to prevent the occurrence of center deviation.

In addition, a loss of function as a magnetron due to a decrease in bonding strength of a brazed portion due to a center shift,
It is possible to prevent the flow of silver solder to parts that are not necessary for silver brazing, and it is possible to braze with the optimum volume, and to obtain a high quality magnetron with improved brazing performance Can be.

[Brief description of the drawings]

FIG. 1 is a detailed sectional view of an output section of a magnetron of the present invention.

FIG. 2 is a vacuum sealing member made of the silver solder of the present invention.

FIG. 3 is a vacuum sealing member made of another silver solder according to the present invention.

FIG. 4 is a detailed sectional view of an output section of a conventional magnetron.

FIG. 5 shows a conventional vacuum sealing member made of silver solder.

FIG. 6 is a partially cutaway view of a magnetron.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anode body 2 Bain 3 Cathode body 4 Antenna conductor 5 Inner strap ring 6 Outer strap ring 7,8 Magnetic pole piece 9,10 Sealing metal 11 Exhaust pipe 12 Insulating cylinder 13 Cathode stem 14 Cathode terminal 15 Magnet 16 Heat sink 17 Yoke Reference Signs List 18 shield case 19 choke coil 20 penetrating capacitor 21 top shell 22 vacuum sealing member 23 inner brazing jig 24 outer brazing jig

Continued on the front page (72) Inventor Setsuo Hasegawa 2-5-1-5 Keihanhondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Inventor Kazuki Miki 2-5-5-1 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Noriyuki Murao 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 5C029 GG02

Claims (10)

[Claims] 1. A tubular anode body having a plurality of vanes, a tubular sealing metal connected to an opening of the anode body, and a vacuum sealing member interposed in the opening of the sealing metal. An insulating cylinder connected to the insulating cylinder, an exhaust pipe connected to the insulating cylinder via a vacuum sealing member, and an antenna conductor connected to one of the vanes and inserted into the exhaust pipe. A magnetron, wherein the vacuum sealing member is formed of a silver solder having a positioning function, and brazed by the vacuum sealing member. 2. The magnetron according to claim 1, wherein the shape of the silver solder as the vacuum sealing member is a stepped cylindrical shape. 3. The magnetron according to claim 2, wherein a side surface of the silver solder as the vacuum sealing member is formed in a tapered shape. 4. A silver brazing member as a vacuum sealing member, wherein a convex portion is provided on a side surface of the silver brazing member.
The magnetron described. 5. The magnetron according to claim 2, wherein a cut-and-raised portion is provided on a side surface of the silver solder as the vacuum sealing member. 6. A vacuum made of a sealing metal and a silver solder having a positioning function is provided on an inner brazing jig having a shape substantially conforming to the inner shape of the sealing metal, the inner shape of the insulating cylinder, and the inner shape of the exhaust pipe. After the sealing member, the insulating cylinder, the vacuum sealing member made of silver brazing having a positioning function, and the exhaust pipe are sequentially placed, the vacuum sealing member made of silver brazing is melted to join the members together. Connecting a cylindrical sealing metal to the opening of the cylindrical anode body having a plurality of vanes, connecting an insulating cylinder to the opening of the sealing metal, connecting an exhaust pipe to the insulating cylinder, A method for manufacturing a magnetron, wherein an antenna conductor inserted into the exhaust pipe is connected to one of the vanes. 7. The method according to claim 6, wherein a stepped cylindrical silver solder is used as the vacuum sealing member. 8. The method according to claim 7, wherein a silver solder having a tapered side surface is used as the vacuum sealing member. 9. The method for manufacturing a magnetron according to claim 7, wherein a silver solder having a convex portion on a side surface is used as the vacuum sealing member. 10. The method for manufacturing a magnetron according to claim 7, wherein a silver solder having a cut-and-raised portion on a side surface is used as the vacuum sealing member.