JPS6142278Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the cooling structure of a collector non-grounded electron beam tube.

As is well known, the electron beam that has contributed to the oscillation or amplification effect in the oscillation or amplification electron beam tube is captured by the collector and is consumed as heat, raising the collector temperature. Therefore, in the electron beam tube, it is necessary to cool the collector by some method to keep the collector temperature sufficiently low. It is a well-known fact that methods for cooling such collectors include forced air cooling, natural air cooling, water cooling, conduction cooling, etc., and that they are used depending on the amount of power consumed by the collector.

Conventionally, the heat generated in the collector has a collector fitting hole 2 as shown in FIG. In an example, the heat radiation block 4 is electrically insulated from the case mounting plate 5, and a metallization process is applied to improve heat dissipation between the heat radiation block 4 and the case mounting plate 5. An insulator 6 such as good Beryliya was soldered and heat was dissipated by a cooling assembly 10. and,
The cooling structure 10 is fastened and fixed to the case substrate 9 with a plurality of screws 8, and the collector is fastened with a plurality of screws 7 provided on the heat dissipation block 4 after being fitted into the collector fitting hole 2. Thus, the heat generated in the collector 1 is dissipated via the heat dissipation block 4, the insulator 6, the case mounting plate 5, and the case substrate 9. However, in the cooling structure 10, an insulator 6 such as Beryllium metallized to improve heat dissipation is used, and a soldering process is included, so it is very expensive. It has the disadvantage that it is a hazardous substance and requires careful handling.

The present invention has been made to eliminate the above-mentioned drawbacks and provides a cooling structure that is easy and inexpensive to manufacture and does not impair heat dissipation.

According to the present invention, an internal heat dissipation block having a fitting hole for housing the collector of an electron beam tube, and an internal heat dissipation block that is screwed and fastened to the electron beam tube mount board and has a fitting hole for housing the internal heat dissipation block. A part of the fitting hole has a slotted structure, and a thin part is formed by at least one axial groove formed from the outer periphery toward the center, and between the two blocks. There is obtained an electron beam tube characterized in that it is equipped with a collector cooling structure having a highly electrically insulating insulating sheet interposed therebetween.

An embodiment of the present invention will be described below with reference to the drawings. In Fig. 2 a and b, internal heat dissipation block 2
3 is made of a cylindrical metal with high thermal conductivity, and a circular collector fitting hole 2 into which the collector 1 of the electron beam tube is inserted is provided in the center. , a plurality of screws 24 for fixing the collector 1 are provided. Since the internal heat dissipation block 23 needs to be electrically insulated, an insulating sheet 21 such as a heat-resistant Teflon sheet with relatively high mechanical strength and high insulating properties is wrapped around the outer peripheral surface of the internal heat dissipation block 23, which will be described later. It is inserted into the internal heat dissipation block fitting hole 22 provided in the. The internal heat dissipation block fitting hole 22 of the external heat dissipation block 27 is formed so as to be concentric with the collector fitting hole 2 and the outer peripheral surface of the internal heat dissipation block 23, and a part of it is located at the center of the internal heat dissipation block fitting hole 22. It has a split groove 3 that is parallel to the axis and reaches the internal heat dissipation block fitting hole 22.

The external heat dissipation block 27 having such an internal heat dissipation block fitting hole 22 is similar to the internal heat dissipation block fitting hole 2.
A groove 25 having a thin wall that does not reach the internal heat dissipation block fitting hole 22 is formed on both sides on the center line of the slot 2, and a protrusion 26 facing both sides of the slot groove 3 is provided perpendicularly to the axial direction. A plurality of screws 7 are provided. By tightening the screws 7, the internal heat dissipating block 23, which is fitted into the internal heat dissipating block fitting hole 22 of the external heat dissipating block 27 via the insulating sheet 21, is fastened and fixed, thereby forming the cooling structure 10.

The cooling assembly 10 is then tightened and fixed to the case substrate 9 with a plurality of screws 8. On the other hand, the collector 1 of the electron beam tube is inserted into the collector fitting hole 2 provided in the internal heat dissipation block 23, and is tightened and fixed with a screw 24. In this way, the heat generated in the collector 1 can be dissipated in the following order: collector→internal heat dissipation block 23→electrical insulating sheet 21→external heat dissipation block 27→case board 9 with a simpler structure than the conventional one.

According to the present invention, there is no need for processes such as metallization or soldering, and there is no need for expensive insulators such as Beryliya, so an inexpensive and highly reliable cooling structure can be obtained. Furthermore, since there is no soldering, the thermal conductivity of the insulator is relatively low, so insulators used in cooling structures that require high thermal conductivity must be as thin as possible, and must have high heat resistance and electrical insulation. It has to be something.

In the above embodiment, the insulator has a thickness of 0.1 to 0.2 mm.
A Teflon sheet was used, and good results were obtained in both thermal conductivity and electrical insulation.

In the above embodiment, the internal heat dissipation block 23 is effective in terms of heat transfer when the diameter of the collector 1 is small, but when the diameter of the collector itself is large, the internal heat dissipation block 23 has to be used by the collector. It is also possible to directly fasten the collector to the external heat dissipation block 27 via an electrically insulating sheet.

Naturally, the present application includes such modifications. It goes without saying that the present structure can also be applied to a multi-stage collector type electron beam tube in which it is necessary to electrically insulate at least one or more collectors in a grounded collector type electron beam tube.

[Brief explanation of drawings]

FIGS. 1a and 1b are axial cross-sectional views showing the cooling structure of a conventional electron beam tube, and A-A in FIG. 1a, respectively.
2A and 2B are an axial sectional view and a sectional view taken along the line A--A in FIG. 2A, respectively, showing an embodiment of the cooling structure for an electron beam tube according to the present invention. 1... Collector of electron beam tube, 2... Collector fitting hole, 3... Slot groove, 4... Heat dissipation block, 5... Case mounting plate, 6... Insulator, 7,
8, 24...screw, 9...case board, 10...
Cooling structure, 20... Heat conduction path, 21... Electrical insulation sheet, 22... Internal heat dissipation block fitting hole,
23... Internal heat dissipation block, 25... Thin wall groove,
26... Protruding portion, 27... External heat dissipation block.

Claims (1)

[Scope of utility model registration request] an internal heat dissipation block having a fitting hole for housing the collector of the electron beam tube; and an internal heat dissipation block that is screwed to the electron beam tube mount board and has a fitting hole for housing the internal heat dissipation block; an external heat dissipation block having a slotted structure in which a part thereof has a slotted structure, and a thin wall portion formed by at least one axial groove formed from the outer periphery toward the center; and an external heat radiation block interposed between the two blocks. An electron beam tube characterized in that it is equipped with a collector cooling structure having an insulating sheet with high electrical insulation properties.