SU600383A1 - Heat pipe - Google Patents

Description

(54) HEAT PIPE

360

the enclosures form alternating channels, the channels of which are made closed, and the other with parallel walls n open into the central cavity of the enclosure, the width of the channels respectively being in a 2: 1 ratio. The corrugated grid is rolled into a tube, overlapped along the longitudinal edges and attached to the body with the tops of the corrugations, which ensures the stability of the thermal characteristics, while, in order to preserve them without peeling the mesh in the curved body, the corrugations are screwed at an inclination to the forming body 1 -20 °.

In addition, in order to expand the range of operating temperatures when installing the pipe at an angle to the horizontal, the grid is made multi-layered with various height of the corrugations in the layers forming closed channels, with the layers being interconnected in the upper corrugations.

FIG. 1 shows a longitudinal section of a heat pipe; in fig. 2 is a cross-section of a pipe with a corrugated grid of various variants; in fig. 3 is a cross section of the corrugations of the interlayers; in fig. 4 - mesh corrugations in isometry; in fig. 5 - is folded into the screw tube; corrugated capillary structure in isometry.

The heat pipe comprises a housing 1 filled with coolant and a multilayer 2, 3 and 4 rolled into a tube (see FIG. 3) a corrugated mesh or a single layer twill mesh network with a multilayer capillary bundle, deformed into flat-walled corrugations, as shown in FIG. . 2. Corrugations form papillary channels 5 and 6 of two types alternating along the entire length of the body with significantly larger effective radii (approximately by one order) in comparison with the radii of the capillaries of the networks.

Channels 5 are formed by a grid with parallel walls, which open into the central cavity of the pipe and alternate with adjacent channels 6 of a closed type.

Channels b are made wider in comparison with channels 5 (with respect to predominantly 2: 1). The walls of the channels 6 have a relative inclination and are closed along radii (smaller in size against the wall and larger towards the center).

When the wall of the multilayer is made with a different height of the corrugations in the layers 1, lobar capillary channels 7, 8 and 9 are formed.

Elastic deformation of the corrugation along the radii when filling the corrugated mesh tube into the casing: to uniform pressing of the vertices of the corrugation against the wall of the housing without using any additional spacers.

Equal capillary canadals 7, 8 and 9 are arteries of constant flow area

Fluid flow from the condensation zone to the evaporation zone of the heat pipe, which ensures minimal hydraulic and thermal losses, as well as maximum flow sections in the fluid channels.

The central cavity of the pipe body, which is free of corrugations, is used for steam flow.

Mesh corrugations have an arched structure 10 (Fig. 4) with a diamond-shaped mesh configuration, especially when the diagonal fabric is located at an angle of 15-45 ° to the corrugation, which gives elastic elasticity and ensures that the corrugation is everywhere to the body without flaking even when imposing significant vibration loads.

Screwing the corrugation when rolling the tape 11 into the tube with welding its edges 12 overlap 13, for example, spot welding, with an angle of inclination j3 1-20 to the generatrix of the pipe body (Fig. 5) provides elastic tension and corrugation in the curved body, and also stability of characteristics with inertial overloads in both straight and curved housings.

Heat pipe works as follows

When heat is applied to one of the ends of the housing 1, the coolant evaporates and moves along the central cavity of the pipe body to the opposite end, where napbi condense during heat removal. Liquid heat carrier under. the action of capillary forces returns to the evaporation zone through the layers of the mesh and along the arteries (channels) 7, 8 and 9.

Thus, heat transfer occurs in the longitudinal direction.

The use of a corrugated mesh with a multilayer set of capillary channels of different effective radii improves their wetting and channel filling with liquid, reduces thermal resistance in the gravity field, increasing the heat flux density in the evaporation zone.

Such an embodiment of the heat pipe allows increasing the heat transfer rate, reducing thermal resistance, simplifying manufacture and assembly, and reducing the labor intensity of manufacturing.

Claims (4)

1. A heat pipe containing a cylindrical sealed enclosure filled with a coolant with a cough structure inside a corrugated mesh, characterized in that, in order to improve thermal performance by increasing heat transfer, reducing the temperature difference and reducing hydraulic resistance, the corrugations are evenly spaced around the wall of the housing with the formation of alternating channels, one of which is made closed, and the other is complete with parallel walls and open into the central cavity of the body, with the width on the channels, respectively, is in a ratio of 2: 1. 2. A pipe according to claim 1, characterized in that, in order to ensure the stability of the thermal characteristics by pressing the corrugation peaks to the body, the corrugated mesh is rolled into a tube, overlapped along the longitudinal edges and attached to the body by the corrugated peaks. 3. A pipe according to claim 1, characterized in that, for the purpose of dispersing a range of workers temperatures when installing the pipe at an angle to the horizontal, the grid is made of multilayer corrugations with different heights in the layers forming closed channels, and the layers are interconnected in the tops of the corrugations near the housing wall. 4. A pipe according to Claim 1, characterized in that, in order to maintain stable thermal characteristics without grid peeling in a curved body, the corrugations are arranged in a perpendicular line with an inclination to forming the body 1-20. Sources of information referred to in the examination 1. US Patent No. 822743, cl. 165-105, published. 1974.