JPH02129830A - Magnetron device - Google Patents

Abstract

PURPOSE:To increase a heat capacity in the intermediate portion of the peripheral surface of a magnetron anode cylinder so as to enhance a cooling effect by setting the thickness of heat radiating plates disposed in the intermediate portion larger than that of other heat radiating plates disposed at both ends when a plurality of heat radiating plates are attached in a multistage manner. CONSTITUTION:Heat radiating plates 13 made of aluminium attached to the intermediate portion of the peripheral surface of an anode cylinder 2 are thicker than other heat radiating plates 14 made of aluminium attached at both ends of the cylinder 2. The other parts are constituted in the same manner as conventional devices. The number of the plates 14 are two, but is arbitrary. At any rate, the plates 13 attached to the intermediate portion of the cylinder 2 which becomes the highest temperature are thicker so that a radiator capable of exhibiting a large cooling effect can be obtained even if the size thereof and the number of the plates to be used are restricted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetron device in which a large number of heat sinks are mounted in multiple stages on the outer peripheral surface of an anode cylinder of a magnetron.

2. Description of the Related Art The magnetron device as described above is used in microwave heating equipment such as a microwave oven, and is usually constructed as shown in FIG. That is, the copper anode cylinder 2 surrounding the cathode 1 has a large number of copper anode vanes 3 protruding toward the cathode 1 on its inner peripheral surface, and an elongated microwave extraction tube extending from one of the anode vanes 3. The conductor 4 is a mortar-shaped first
It passes through the magnetic pole piece 5 , the eyelet-shaped first metal tube 6 , and the ceramic tube 7 to reach the microwave output terminal 8 . Further, the flange portion 6a of the first metal tube 6 is sealed to one open end portion of the anode cylinder body 2, covering the first magnetic pole piece 5, and the stem 9 for leading out the cathode terminal has an eyelet-like shape. second metal tube 1
0 to the other open end of the anode cylinder body 2. Note that a second magnetic pole piece (not shown) shaped like a mortar and covered with the flange portion 10a of the metal tube 10 faces the first magnetic pole piece 5.

On the other hand, the numerous heat sinks 11 attached in multiple stages to the outer peripheral surface of the anode cylinder 2 by press-fitting the anode cylinder 2 into the central hole are made of aluminum and have a shape as shown in FIG. A radiator 12 is formed, and a forced air cooling airflow flows between the heat radiating plates 11.

In the magnetron device configured in this way, each flange portion 5a, 1 of the first and second metal tube 6.10 is
An annular permanent magnet for excitation is coaxially stacked on 0a, but due to the heat dissipation effect of the radiator 12 and the forced air cooling airflow, abnormal temperature rise of the anode cylinder 2 during device operation is suppressed. , it is possible to prevent the occurrence of high-temperature troubles such as demagnetization caused by the permanent magnet becoming hot.

Problems to be Solved by the Invention However, in order to satisfactorily obtain the heat dissipation effect as described above, a large number of fairly large heat dissipation plates are required, and these are subject to restrictions in terms of space, cost, etc.

Means for Solving the Problems According to the present invention, among a large number of heat sinks mounted in multiple stages on the outer peripheral surface of an anode cylinder, the one located in the middle is larger than the heat sinks located at both ends. Adjust the board thickness.

Function: With this configuration, the thick heat sink is located in the middle part of the anode cylinder, which has the highest temperature during operation of the device, so the heat capacity in the middle part is larger than that in other parts. Even though a relatively small heat sink is used, an efficient cooling effect can be obtained.

Embodiment Next, the present invention will be explained with reference to the embodiment shown in FIG. Note that the same components as shown in FIG. 2 are given the same reference numerals and their explanations will be omitted.

The structure shown in FIG. 1 is different from the conventional structure shown in FIG. The only difference is that the plate is thicker than the aluminum heat dissipating plates 14 attached to both ends of the plate, and the other configurations are the same. In the illustrated example, there are three heat sinks in the middle and two heat sinks at both ends, but the number of heat sinks can be selected as appropriate. Moreover, a heat sink having a thickness intermediate between the heat sinks located at the intermediate portion and the heat sinks located at both ends may be placed between the heat sinks located at the intermediate portion and the heat sinks located at both ends.

In either case, since a thick heat sink is located in the middle part of the anode cylinder 2 where the temperature is highest, the heat capacity in the shaped part is larger than in other parts, which limits the size and use. By using a large number of heat sinks, a heat sink with high cooling efficiency can be obtained.

Effects of the Invention As described above, according to the present invention, the heat capacity at the middle part of the anode cylinder where the temperature is highest increases, so it is possible to avoid increasing the size of the heat sink, the number of plates used, and the amount of air flow. Even if the thickness of the heat sink at both ends is less than or equal to that of a conventional heat sink, a cooling effect superior to that of the conventional heat sink can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view of a magnetron device embodying the present invention, FIG. 2 is a partially cutaway side view of a conventional magnetron device, and FIG. 3 is a perspective view of a heat sink of the same device. 2... Anode cylinder body, 13.14... Heat sink.

Claims (1)

[Claims] Of the many heat sinks installed in multiple stages on the outer circumferential surface of the magnetron's anode cylinder, the one located in the middle has a greater thickness than the heat sinks located at both ends. Features a magnetron device.