SU1216620A1 - Flat gravity heat tube - Google Patents

Description

2, The pipe according to claim 1, wherein the inner surface of the case is provided with a porous structure. The invention relates to heat engineering, in particular to devices for cooling power semiconductor devices.

. The purpose of the invention is to expand the functionality and simultaneously increase the heat transfer capacity of the heat pipe,

FIG. 1 shows a flat gra-: Bit heat pipe, a longitudinal section in FIG. 2, a section A-A in FIG. one.

The flat gravitational heat pipe contains a housing 1 partially filled with heat carrier with an evaporator 2 and a condenser 3, the evaporator 2 being made with a system of cylindrical channels 4 connected by a collector 5 on the side opposite to the condenser 3. Between the evaporator 2 and condenser 3 an expansion steam chamber 6 is installed, which, on its one side, channels 4 of the evaporator 2 are drawn, and on the other side of the board, a flat slit cavity of the condenser 3. The cylindrical channels 4 are located in the evaporator 2 fanlike, with an enlarged The distance between them in the direction of the expansion chamber 6. Outside, the capacitor is provided with ribs 7. Circumference 8 is limited to the contact zone of the evaporator 2 with a semiconductor tablet device (not shown) When making an AMC alloy body, a porous layer about 0.2 mm thick was obtained by etching 30 % hydrochloric acid solution for 20 hours at 25% or potassium hydroxide solution for 28 hours at 20 ° C. The evaporator 2 and condenser 3 with chamber 6 can be made by extrusion and then

by etching after fabrication of the body.

after making the channels 4 in the evaporator 2 and the slit-like internal cavity in the condenser 3, are tightly interconnected. The pipe has two main working positions — the first, as shown in FIG. 1, and the second - the evaporator 2 down. In the first position, the level of the liquid coolant may be at a height of

the top of the zone of contact with the semiconductor device (in the absence of a porous layer) or at the height of the center of the specified zone (in the presence of a porous layer with a thickness of 0.2 mm).

The outermost channels 4 are outside this zone.

The flat gravitational heat pipe in the first position (Fig. 1) works as follows.

When heat is applied in the corresponding zone of the evaporator 2, the coolant in the channels 4 in this zone and near it boils, while the two-phase medium formed in the upper channels 4

enters the expanding vapor chamber 6, where the vapor separates from the liquid and then enters the cavity of the condenser 3, along the walls of which after condensation the liquid flows

way down. On the lower channel 4 liquid coolant enters the collector 5 and then again falls into the upper channels 4.

When the pipe is working in the second position (evaporator down), the vapor (two-phase medium) moves upwards through the middle channels 4, and the heat-transfer fluid enters the collector 5 through the extreme channels 4. Such circulation is caused by a higher density of the liquid compared to the steam density two-phase capacitance environment.

Editor E. Papp

Compiled by A. Lobanov

Tehred L. MiKep; Proofreader V. But ha

992/50 Circulation 590 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch 1ShP Patent, Uzhgorod, Proektna St., 4

FIG. 2

Claims (2)

1. A PLANE GRAVITATIONAL HEAT PIPE, comprising a body partially filled with a coolant with an evaporator and a condenser, the evaporator being made with a system of channels connected by a collector located on the side opposite the condenser, characterized in that, in order to expand the functionality and at the same time increase the heat transfer abilities, in the case between the evaporator and the condenser an expansion steam chamber is additionally installed, and the channels of the evaporator are fan-shaped with icheniem distance therebetween in the direction of the expansion chamber. FIG. 1 2. A pipe according to claim 1, characterized in that the inner surface of the body is provided with a porous layer obtained by etching after the manufacture of the body.