SU1079994A1 - Flat heat pipe - Google Patents

Abstract

1. FLAT HEAT PIPE, containing a housing filled with coolant with slotted evaporation, transport and condensation zones, divided by longitudinal ribs into central and bypass channels, characterized in that, in order to increase thermodynamic efficiency, the condensation zone is made with a broadening and inclination from the axis center channel in the direction of the • bypass channel.2. A pipe according to claim 1, characterized in that, in order to ensure reliable operation in conditions of reduced gravity, the slit evaporation and condensation zones are made; tapering away from the zone of transport.

Description

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The invention relates to heat engineering, in particular to heat pipes.

A heat pipe is known, comprising a cylindrical body with a coolant, with evaporation, transport and condensation zones, a coaxial insert forming an annular channel with the body, the width of which is compatible with the steam bubble diameter l

The disadvantage of the pipe is a large thermal resistance due to the accumulation of non-condensable gases in the condensation zone.

Also known is a flat heat pipe containing a body filled with a coolant with slotted zones of evaporation, transport and condensation, divided by longitudinal ribs into the central and bypass channels f2J

The disadvantage of this heat pipe is the low thermodynamic efficiency due to the absence of a separate channel for draining condensate from the condensation zone.

The purpose of the invention is to increase thermodynamic efficiency.

The goal is achieved by the fact that in a flat heat pipe containing a housing filled with coolant with slotted evaporation, transport and condensation zones, divided by longitudinal ribs into central and circumferential channels, the condensation zone is made with broadening and slope from the axis of the central channel towards the bypass channels.

In addition, in order to ensure reliable operation in conditions of reduced gravity, the slit evaporation and condensation zones are constricted tapering away from the transport zone.

FIG. 1 shows a flat heat pipe, a cross-section} in FIG. 2 - the same longitudinal section,

The flat heat pipe includes a housing 1 with slit zones of the evaporator 2, transport 3 and condensation 4, longitudinal ribs 5, central channel b and bypass channel 7, the condensation zone is broadened with elevation HaMii 8.

The flat heat pipe operates in the following way.

When heat is applied to the zone, vapor bubbles form in the central channel B, which, under the action of capillary forces, Lrhimed forces and hydrostatic head, rise through the transport zone 3 to the condensation zone 4. After condensation, the heat transfer fluid flows along slopes 8 into the bypass channel 7 and then to the condensation zone,

Under conditions of reduced gravity, when the capillary forces are commensurate with the Archimedes force, it is advisable to perform the gap evaporation zones 2 and condensation 4 narrowing away from the transport zone.

When filling a heat pipe with a coolant with a boiling point, it can be used to recover heat from the output gases. When filling a pipe with a coolant with a boiling point of 50-80 ° C, it can be used to cool the engine oil, to thermally stabilize and cool powerful electronic devices to replace massive all-metal chillers.

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FIG.

Claims (2)

1. A FLAT HEAT PIPE containing a housing filled with a coolant with slotted zones of evaporation, transport and condensation, separated by longitudinal ribs into central and bypass channels, characterized in that, in order to increase thermodynamic efficiency, the condensation zone is made with broadening and slope from the axis Central channel towards the bypass channel. 2. The pipe according to claim 1, characterized in that, in order to ensure reliable operation in conditions of reduced gravity, slotted evaporation and condensation zones are made; tapering in the direction from the transport zone.