JPS6118301B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a magnetron, and more particularly to a method for temporarily fixing an antenna conductor to one end of a vane.

Generally, magnetrons are used in microwave ovens, defrosters, etc. because they efficiently generate high-frequency output. Figure 1 is a fragmented longitudinal cross-sectional view showing a conventionally commonly used magnetron.
1 is a cylindrical anode cylinder; 1a is a plurality of vanes radially fixed to the inner wall of the anode cylinder so as to be evenly distributed within the anode cylinder; the anode cylinder 1 and the vanes 1a constitute an anode; are doing. Reference numeral 2 denotes a cathode, which is a heating wire formed into a spiral shape and is arranged along the central axis of the anode cylinder 1. Further, the cathode 2 forms a so-called working space between it and the vane 1a. Reference numerals 3 and 4 are conical magnetic pole pieces fixed to both ends of the anode tube 1 by brazing, arcing, etc., and concentrate magnetic flux in the working space. Reference numeral 6 denotes an output side insulator made of a ceramic cylinder, a glass cylinder, etc., and is fixed to the magnetic pole piece 3 via a sealing metal 5 such as Kovar. Further, a copper exhaust pipe 7 is fixed to the upper end of the output side insulator 6, and this exhaust pipe 7 is hermetically pressure-welded to an antenna conducting wire 8 connected to a part of the vane 1a. Reference numeral 9 is a metal cover that protects this press-contact part and prevents sparks due to electric field concentration at the press-contact part, and also serves as a high-frequency antenna, and is press-fitted to a part of the exhaust pipe 7. 10 is a sealing metal that seals the stem 11 that supports the cathode 2.

In the magnetron thus constructed, the anode tube 1 has a structure as shown in FIG. That is, in the same figure, anode tube 1
There are 12 holes protruding at equal intervals on its inner circumference.
A vane 1a is provided, the vane 1a has concentric recesses at its upper and lower ends, and inner strap rings 12a, 12b and outer strap rings 13a, 13b are fixed alternately, respectively.
Also, an antenna conductor 8 is placed on one vane 1a at an appropriate position between the inner surface of the anode tube 1 and the outer strap rings 13a and 13b on one of the upper and lower end surfaces of the vane 1a.
A groove 14 is provided into which one end of the groove 14 is inserted.
One end of the antenna conducting wire 8 is inserted into and fixed to.

In the anode tube configured as described above, a method for temporarily fixing one end of the antenna conductor 8 to the vane 1a is to insert the recess 8a at one end of the antenna conductor 8 into the antenna insertion groove 14 of the vane 1a, as shown in FIG. After that, a silver soldering ring (not shown) or a paste-like silver brazing material (not shown) necessary for final fixing is attached to the joint part, and brazing (not shown) is performed to prevent the antenna conductor 8 from being partially pulled out, falling down, falling off, etc. There is a method in which the antenna conducting wire 8 is maintained through a jig. Another method is to insert the recess 8a at one end of the antenna conductor 8 into the groove 14 of the vane 1a, and then form a wedge-shaped caulking indentation 15 at the end of the vane 1a, as shown in FIG. There is a method in which the conductor wire 8 is caulked and fixed without using a brazing jig. Furthermore, as another method, as shown in FIG. 5, there is a method in which a hole 16 is provided in the axial direction at the end of the vane 1a, and the concave portion 8a at one end of the antenna conducting wire 8 is caulked into the hole 16.

However, the method shown in FIG. 3 requires manufacturing costs for the brazing jig, and wastes energy because the brazing jig is heated at the same time during brazing. Furthermore, the method shown in Fig. 4 does not use a brazing jig, so it has the advantage of saving energy, but since the vane 1a is fixed only by the crimp force due to caulking, the machining accuracy of the antenna insertion groove 14 may vary, and the antenna conductor The crimp force may also vary due to variations in the wall thickness of the wire 8 or variations in the crimping force, and the antenna conductor 8 often becomes partially disconnected or falls off due to handling, vibration during brazing, external force, etc. However, there was a drawback in reliability during temporary fixation. Furthermore, in the method shown in Fig. 5, in which the anode cylinder 1 and the vane 1a are made separately and the anode is formed by brazing or the like, it is necessary to make a hole in one vane in advance by cutting or pressing. It is effective as a temporary fixing method to be able to do this, and to swage the concave portion 8a of one end of the antenna conductor 8 into the vane hole 1b. However, the anode tube 1
In an anode in which 12 vanes 1a are integrally formed by press working or the like, it is extremely difficult to form holes in the vanes 1a.
There is a quality problem that deforms a.

Therefore, an object of the present invention has been made to solve the above-mentioned problems, and a method for manufacturing a magnetron according to the present invention will be explained in detail below with reference to the drawings.

FIG. 6 is a perspective view of a main part showing an example of an antenna conducting wire for explaining an embodiment of a method for manufacturing a magnetron according to the present invention, particularly a method for temporarily fixing an antenna conducting wire. In the figure, this antenna conductor 1
7 is provided with a concave portion 17a for filling, which has a depth t and a width W relative to the plate thickness T of the antenna conductor 17, on one end side surface that becomes the attachment portion with the vane 1a,
A recess 17b is provided at the tip of the antenna, and as shown in FIG. Caulking impression 1
The antenna conducting wire 17 is temporarily fixed by caulking the antenna conductor 17 so as to form a shape 5, and by caulking the caulked portion into a concave portion 17a provided in the antenna. In this case, the dimensions t and W of the filling recess 17a of the antenna conductor 17 are relative to the plate thickness T of the antenna conductor 17.
T is about 0.2T to 0.4T, W is about 1T to 2T, and the wedge-shaped vane 1a caulking sword is 30 to 30 degrees, which can be deformed for practical purposes.
50Kg, and caulking distance from antenna conductor 17
An effective dimension is about 0.2 to 0.3 mm.

According to such a method, half of the antenna conductor 17 that occurs after temporarily fixing the antenna conductor 17,
Problems such as falling off can be completely eliminated.

FIG. 8 is a perspective view of essential parts showing another embodiment of the antenna conducting wire according to the method for temporarily fixing the antenna conducting wire according to the present invention. In the same figure, the antenna conductor 18 is provided at its end in an elliptical hole 18a having diameters W' and W'', and the recess 18b provided at the end face is inserted into the vane 1a, and the vicinity thereof is By tightening, a caulking indentation 15 (not shown) is formed, and the antenna conducting wire 18 is temporarily fixed by interfering with the elliptical hole 18a with the flesh of the vane 1a caused by the caulking.

Even in such a method, the same effect as described above can be obtained.

Note that, in addition to the recess of the antenna conducting wire and the oval hole, the same effect as described above can be obtained even if a V-shaped or circular recess is provided.

As explained above, according to the magnetron manufacturing method according to the present invention, defects such as half-coming out, falling off, and falling of the antenna conductor after temporarily fixing the antenna conductor can be reliably prevented, and reliability in assembly is improved. , yield improvement, etc. can be achieved. In addition, excellent effects can be obtained, such as the method can be easily applied to the automation of anode assemblies and is an effective method for cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a fragmented cross-sectional view of the main part showing an example of a magnetron commonly used in the past, Fig. 2 is a perspective view of the main part showing an example of the anode tube, and Figs. 3 to 5 show the antenna conductor in the vane. FIG. 6 is a perspective view of a main part showing an example of an antenna conducting wire according to a method of manufacturing a magnetron according to the present invention, and FIG. 7 is a perspective view of a main part showing a conventional method of temporarily fixing a magnetron, and FIG. FIG. 8 is a perspective view of a main part for explaining one embodiment of a method for temporarily fixing a conducting wire, and FIG. 8 is a perspective view of a main part showing another embodiment of an antenna conducting wire according to the present invention. 1...Anode cylinder, 1a...Vane, 2...Cathode,
3, 4...Magnetic pole piece, 5...Metal for sealing, 6...Output side insulator, 7...Exhaust pipe, 8...Antenna conductor wire, 9...Metal cover, 10...Metal for sealing, 1
DESCRIPTION OF SYMBOLS 1... Stem, 12a, 12b... Inner strap ring, 13a, 13b... Outer strap ring, 14... Groove, 15... Caulking impression, 16...
...Vane hole, 17...Antenna conductor, 17a...
Filling recess, 17b... recess, 18... antenna conductor, 18a... elliptical hole, 18b... recess.

Claims (1)

[Claims] 1. In a magnetron in which one end of an antenna conducting wire is fixed to a groove provided on one end surface of a vane, a recess for tightening is provided on one end side of the antenna conducting wire, and a recess is further provided at the tip of the antenna conducting wire, and a recess is provided at the tip of the antenna conducting wire. The provided recess is inserted into the groove of the vane, a caulking indentation is formed near the vane groove, and the vane meat is caulked into the recess for tightening of the antenna, thereby attaching the antenna conductor to the vane. A method for manufacturing a magnetron, which is characterized by temporarily fixing the magnetron.