SU1332138A1 - Heat pipe - Google Patents

Abstract

The invention relates to heat engineering and allows to increase the heat transfer capacity of the heat pipe. The end of evaporation zone 2 is made with a solid and limited hemispherical surface. The spherical surface of zone 2 can be covered with a grid of 5 h; this allows for an increase in the maximum heat flux and contributes to an increase in the critical density of the heat flux. The thickened bottom allows a portion of the heat flux to transfer to the side wall of the housing 1, which unloads the heat-induced end of zone 2. The lateral surface of the housing 1 can be covered with mesh strips 7, which form the hull and are made integral with the mesh 5. 1 zp f-ly, 3 ill. (L

Description

1332138

FIELD OF THE INVENTION The invention relates to heat engineering, namely to heat transfer devices.

The purpose of the invention is to increase the heat transfer ability.

 FIG. 1 shows a heat pipe, a longitudinal section; 2, in the presence of a capillary structure of the housing 1 - under the action of capillary

tours; in fig. 3 - mesh billet

The heat pipe contains a hermetic cylindrical body 1 partially filled with coolant with an end evaporation zone 2, the inner surface 3 of which, facing the condensation zone 4, is convex and has the shape of a hemisphere. The end of body 1 in zone 2 of evaporation is made solid and thickened (the thickness of the bottom in the interface of the hemisphere and the side wall can be equal to 1/4 of the internal diameter of the pipe). The pipe may have a capillary structure in the form of a grid 5, pressed against a spherical surface 3 with the aid of a perforated sleeve 6, and between this sleeve and the side wall of the housing 1 parallel mesh lines 7 are placed (Figures 1 and 3). The sleeve 6 is fixed by a retaining ring 8. The mesh billet 9 (Fig. 3) is cut out from the mesh circle, and the strips 7 are made in one piece with the central part of the billet. Mesh cells can have a size of 0.3-0.5 mm.

Heat pipe works as follows.

When heat is supplied and removed in the respective zones, heat and mass transfer is carried out through the pipe with a change in the state of aggregation of the heat transfer medium. When operating in the thermosyphon mode, the condensate flows to the evaporation zone 2 under the action of gravitational forces, with a horizontal position

forces The thickened bottom allows part of the heat flux to transfer to the side wall of the housing 1, which relieves the heat-stressed end of the evaporation zone 2. The spherical surface 3 allows to increase the maximum heat flux by about 1.6 times. The presence of one layer of the grid 5 also contributes to an increase in the critical density of the heat flux.

Claims (2)

1. A heat pipe containing a hermetic cylindrical body with an end evaporation zone, the inner surface of which is facing the condensation zone, is made convex, characterized with 30 in that, in order to increase the heat transfer capacity, the end of the evaporation zone is made with a solid, limited hemispherical surface. 2.Trub POP.1, distinguished35 well with the fact that spherical the surface of the evaporation zone is covered with a grid, and the lateral surface of the body is covered with mesh strips parallel to the body forming the body and are made integrally with the grid. 2 Fig. 3