JPS5937635A - Magnetron - Google Patents

Abstract

PURPOSE:To prevent output efficiency decrease of an aluminum antenna by using copper in the most part of an antenna wire and aluminum in a connecting part of it to a vane, and by making a pipe shape the end of copper wire to wrap the end of aluminum wire in their junction and by caulking them. CONSTITUTION:Aluminum wire 32 is used in the connecting part of an antenna to a vane 2, and the junction of copper wire 31 and aluminum wire 32 is arranged near the vane. The end of copper wire 31 in made to a pipe shape and the end of aluminum wire 32 is wrapped with it and this part is mechanically caulked to connect them. By using aluminum in an anode, weight and cost of a magnetron are decreased and highly reliable output is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a magnetron antenna in which the anode cylinder and vane are made of aluminum.

If the magnetron's anode cylinder and vane are made of aluminum, it is desirable to make the antenna also of aluminum in order to ensure the reliability of the implanted connection between the vane and the antenna, but aluminum has a higher electrical resistance than copper. During magnetron operation, when a microwave standing wave is generated in the antenna, the lowest pressure 1r'r'l flow flows in the middle part of the antenna (indicated by A in Figure 1), and the high frequency loss in that part is This results in a reduction in output efficiency. According to experiments conducted by the present inventor, some aluminum antennas melted and broke in the center when conditions were set such that the output was actually twice the rated force.

The object of the present invention is to make the anode part made of aluminum
The object of the present invention is to provide a magnetron that can output output with high reliability when reducing the manufacturing cost and reducing the cost.

In order to achieve the above object, in the trap of the present invention, most of the antenna wire for output extraction is made of copper wire to prevent a decrease in output efficiency, and the part connected to the vane is made of aluminum to ensure reliability of connection. When using a wire, at the junction point between a copper wire and an aluminum wire, the end of one aluminum or copper wire is made into a tube, and the wire end of the other wire is wrapped around it, and the two are mechanically separated during the crimping process. I decided to make a fixed connection to it.

1H #Abu Takum Iru 2 (Teyo・Tsute) We tried to make the connection easier and more reliable.

FIG. 1 is a cross-sectional view of the main parts of an embodiment of the present invention, where l is an anode cylinder made of aluminum, 2 is an aluminum vane, 3 is an antenna, 4 is an output part, 5 is a ceramic cylindrical output window, 6 7 is a cup-shaped seal, 7 is a magnetic pole, 31 is a copper wire portion of the antenna, and 32 is an aluminum wire portion of the antenna. If you try to plant a copper wire antenna directly on an aluminum vane, for example by welding or trapping, the copper wire will be placed there.
An intermetallic compound of aluminum is generated, and this intermetallic compound is brittle (and cracks easily occur).

In other words, in order to ensure reliability, it is necessary to avoid directly welding a copper wire antenna to an aluminum vane, and to use aluminum for the part of the antenna that is implanted in the vane. Therefore, it becomes necessary to relay the copper wire portion 31 and aluminum wire portion 32 of the antenna. From the results of the high power experiment mentioned above, it is known that the central part of the antenna tends to become hot, so the copper wire part 31 and the aluminum wire part 32 are
At the relay point, the aluminum wire part: 32 should be short (and close to the vane). Also, since the intermediate compound of copper and aluminum is brittle, welding connections should be avoided even at the antenna relay point. In the invention, as shown in Fig. 2, the end of the copper wire section 31 is made into a tubular shape, and the end of the aluminum wire section 320, which is still in the shape of a tube, is wrapped around it, and the section is strongly caulked from the outside to mechanically tighten it. Of course, the aluminum side end may wrap around the braided wire in a tubular shape.

As explained above, according to the present invention, output can be obtained with high reliability in a magnetron whose anode portion is made of aluminum to reduce weight and N value.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention, and FIG. 2 is a sectional view showing the structure of a relay point between a copper wire portion and an aluminum wire portion of an antenna according to the present invention. DESCRIPTION OF SYMBOLS 1... Anode cylinder, 2... Vane, 3... Antenna, 4... Output part, 5... Ceramic output window, 31
...Copper wire part of the antenna, 32...Aluminum wire part of the antenna. Figure 1

Claims (1)

[Claims] 1. In a magnetron having a plurality of aluminum vanes forming a cavity resonator and an output extraction antenna implanted and connected to one of these vanes, this antenna is connected to the vane side. Aluminum, the output side is made of copper, and the copper part is long (and the aluminum part is short).
The magnetron is further characterized in that, at a relay point between parts made of different materials, the tubular end of one part of the material is wrapped around the linear end of the other part, and the parts are fixedly connected by caulking. A magnetron according to claim 1, which has a negative scope.