JPS61121239A - Magnetron device - Google Patents

Abstract

PURPOSE:To closely couple a pair of yoke pieces by caulking by forming a pair of extruded ears which gradually becomes thinner as it comes to the end, bending the band region into the recessed portion of side wall, allowing said region to bite into the area between extruded ears. CONSTITUTION:The first and the second yoke pieces 1, 5 are combined and thereafter the band region 4 is bent inward. Thereby, it is located on a pair of extruded ears 8a, 8b of the band region 4. At this time,it is desirable that a pair of extruded ears 8a, 8b enter a little into the slot 3. Thereafter, when the intermediate part of band region 4 is bent, the intermediate part of band region 4 bites between the extruded ears 8a, 8b and the caulking terminates. Since the extruded ears 8a, 8b are formed in such a way as gradually becoming thinner as it comes to the end, the side wall open end edge of yoke piece 1 is strongly attracted toward the side wall of yoke piece 5 during said biting process, both yoke pieces 1, 5 are integrally coupled under the condition that these are closely in contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetron device comprising a magnetron and its excitation circuit member.

2. Description of the Related Art Magnetron devices, which are integrated with a magnetron and its excitation circuit member, are widely used in microwave ovens and the like. The excitation circuit member is energized, and includes two annular permanent magnets stacked on one and the other magnetic pole piece of the magnetron to magnetically couple one magnetic pole to the magnetic pole piece, and the other magnetic poles of both hydraulic magnets. It consists of a frame-shaped yoke that magnetically couples the yoke. The frame-shaped yoke is obtained by combining a first yoke piece with a U-shaped cross section and a second yoke piece with an opening shape in cross section and tightening them with screws. The process of making several small holes with attachments, inserting the ports into them, and screwing them together is a complicated process, and is not particularly suitable for mass production.

Therefore, a connection structure using caulking, as seen in Japanese Patent Laid-Open No. 49-108961, has been proposed.

However, in a crimped structure in which the protrusion of the other joint is simply inserted into a slot provided in one of the joint pieces, and this insertion portion is crushed and deformed, the extension of the protrusion during compression or variations in the precision of the parts may cause Gaps are likely to form between the yoke pieces, and if such a gap occurs, not only will the mechanical strength of the frame-shaped yoke decrease, but also the magnetic circuit resistance will increase, causing a decrease in excitation efficiency.

Problems to be Solved by the Invention Accordingly, an object of the present invention is to provide a magnetron device suitable for mass production that can tightly connect a first yoke piece and a second yoke piece by caulking. .

Means for Solving the Problems According to the present invention, the first yoke piece has a slot near the open end of the side wall, and the second yoke piece has a slot 1 that protrudes from the side wall recess and faces the slot. It has a pair of protruding ears. The distance between the pair of protrusions is narrowed toward the tip, and the band region between the slot and the open end of the side wall is bent into the side wall recess and wedged between the pair of protrusions. Ru.

Operation Because of this configuration, in the process of the band region biting into the pair of prongs, the side wall opening edge of the first yoke piece is strongly pulled toward the side wall side of the second yoke piece. As a result, the two joint pieces are pressed together in close contact with each other. In addition, since the pair of projecting ears protrudes from the side wall recess of the second yoke piece, the pair of projecting ears protrude from the side wall recess of the second yoke piece. It has the advantage of not becoming a large obstacle.

EMBODIMENTS Next, the present invention will be explained in more detail with reference to embodiments shown in the drawings.

As shown in FIG. 1, a first yoke 1 having an open cross-section has a central hole 2 in its bottom wall and a slot 3 along its open end 1a in its side wall. 4 indicates a band region located between the open end 1a and the slot 3. On the other hand, the second yoke piece 6 having an opening-shaped cross section has a central hole 6 in its top wall, and a side wall recess 7 has a pair of protruding ears 8 &, which protrude laterally from the central hole 6.
8b. However, the slot 3 and band region 4 of the first yoke piece 1 are formed not only on one side wall but also on the other side wall, and the side wall recess 7 and the pair of protrusions on the second yoke piece 6 are formed in the same way. The ears s& and Bb are similarly formed not only on one side wall but also on the other side wall.

As shown in FIG. 2, the side wall recess 7 of the second yoke 5 enters from the side wall main surface 9, and the tips of the pair of prongs 6a and Bb that project laterally from this are located on the side wall main surface. It is located in almost the same plane as the outer surface of 9, or it protrudes slightly beyond this plane. and a pair of pronged ears aa
, ab become narrower toward the tip. Further, the slot 3 of the first yoke piece 1 is located so as to face the pair of protruding ears 82L, 8b, and has a size sufficient to allow the pair of protruding ears 81°8b to be inserted therethrough. There is.

After combining the first and second yoke pieces 1.5 as shown in FIG. 2, when the band region 4 is bent inward as shown in FIG. 3, the band region 4 forms a pair of prongs. Ba, B
It will be located on b.

At this time, it is desirable that the pair of prongs 9N, 51) enter the slot 3 a little, but after this, when the middle part of the band region 4 is bent downward, the middle part of the band region 4 will be bent downward as shown in FIG. As shown in the figure, it bites between the pair of protruding ears 82L and Sb, and caulking is completed. By the way, a pair of pronged ears,
8 b are formed so that the mutual spacing becomes gradually narrower toward the tip, so that the side wall open edge of the first yoke piece 1 moves toward the side wall side of the second yoke piece 5 during the biting process. They are strongly drawn together, and both joint iron pieces 1 and 5 are joined together in close contact with each other.

The completed magnetron device is shown in Figure 5. The first and second yoke pieces 1 and 6 are connected to each other to form a frame-shaped yoke with a cross-section. Surrounded are toroidal permanent magnets 12, 13 stacked on pairs of pole pieces. Note that 14 indicates a filter case, and 15 indicates a feedthrough capacitor for forming a fill circuit.

Effects of the Invention Since the present invention is configured as described above, the first and second yoke pieces forming the frame-shaped yoke can be tightly connected by caulking, and the mechanical strength is high and the magnetic circuit resistance is low. It becomes possible to provide a high-performance, high-performance magnetron device at low cost. Furthermore, since the pair of protruding ears do not protrude significantly outside the yoke piece, assembly work is not hindered, and assembly efficiency can be improved.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
FIG. 1 is an exploded perspective view of the main parts, FIGS. 2 and 3 are plan views of the main parts, FIG. 4 is a perspective view of the main parts, and FIG. 6 is an external perspective view. 1...First yoke piece, 3...Slot,
4...Band area, 5...Second yoke piece, Bz, 6b...Protrusion. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 11. , Kayaj no Tsugi 4 Loss of office 3... Zuro Soto 4... Eroding the band's request ni 5, Iron piece around statue 2 la, 81=...Next ear

Claims (1)

[Claims] A frame-shaped yoke for an excitation circuit that surrounds the anode part of the magnetron and the permanent magnets stacked on the magnetic pole pieces of the anode part is connected to a first yoke piece having a cross section of ■ shape and a cross section of ■ The first yoke piece has a slot near the open end of the side wall facing the pair of protrusions protruding from the side wall recess of the second yoke piece, and A magnetron device characterized in that the distance between the ears narrows toward the tip, and the band region between the slot and the open end of the side wall bends into the side wall recess and bites between a pair of protruding ears. .