SU648824A1 - Adjustable heat pipe - Google Patents

Description

one

The invention relates to heat transfer devices and can be used in cooling systems for thermostatic control in various areas of technology.

Regulated heat pipes are known in which the heat flow is controlled by the action of an auxiliary two-phase medium on the disk valve, which is placed in the vapor channel 1.

About   8TI heat pipes have a combined knnematic scheme of the regulator and a large inertia

The closest technical solution to the invention is to regulate a heat pipe containing a sealed housing partly filled with heat carrier with evaporation, transport and condensation zones and divided into compartments by means of a transverse partition fixed in the transport zone and having a central opening blocked by a regulating valve

2. The sensing element in this heat pipe is a thermal bulb, a full two-phase medium, depending on the pressure of which the Kli opens, the central opening in the partition closes with a valve.

This heat pipe has a complex structure and low speed, due to the thermal inertia of the thermoball.

The purpose of the invention is to simplify the design while increasing speed.

. This is achieved in that the magnet, kinematico, is mounted with the possibility of axial movement within the housing. ki is connected to the valve, and the part of the body in the evaporation zone is made of a thermomagnetic material ja mechanically connected through an elastic element with a magnet. In this case, the partition is made with a cylindrical section of non-magnetic material introduced into the evaporation zone and window, and the valve is made as a cup of non-magnetic material scooped through the partition section and also has a window on the side wall of the partition B one of the extreme positions of the valve.

The drawing shows an adjustable heat pipe, a longitudinal section.

An adjustable heat pipe contains a hermetic cylindrical body 1 with evaporation zones 2 transport, 3 and condensation 4. On the inner surface of the body 1 there is a capillary-porous structure 5, its end 6 is made of a thermomagnetic material. In the zone of transport 3, a transverse partition 7 is fixed, containing an indic section in the evaporation zone 2 in a non-magnetic material with windows 9 for the passage of steam. On the cylindrical section S there is an axial displacement of glass Yu, made of non-magnetic material and rigidly connected to a permanent magnet 11, in the internal cavity of which is mounted on a spring 12. On the side wall of the glass 10, windows 13 are filled with coinciding with the windows 9 of the cylindrical section 8 in the extreme right position of the glass 1O.

The adjustable heat pipe works thawing in the following way.

With insignificant heat loads, when the temperature of the end face 6 does not exceed the Curie point, the magnet 11 contacts the end face 6, the cup 10 is in the leftmost position, when windows 9 and 13 do not coincide and the passage for the coolant vapor to the condensation zone 4 is closed . The heat pipe in this case has a high thermal resistance. As the heat load increases, when the temperature of the end face 6 exceeds the Curie point, the force of interaction between the magnet 11 and the end face 6 31PCh1 is reduced, and under the action of the spring 12, the magnet 11 together with one hundred KM 1O shifts to the extreme right position, while the windows 9 and 13 are combined, the coolant vapor passes into the condensation zone 4, from where the coolant in the liquid phase is transferred via a capillary dNO 41 to the evaporation zone 2. The thermal resistance of the heat pipe drops sharply. As the temperature decreases, the thermomagnetic material returns.

magnetic properties, whereby the structural elements occupy the initial position, stopping the removal of heat from the object to be cooled.

Thus, the heat pipe operates in the on-off thermal resistance control mode.

An adjustable heat pipe is simple in design and has a relatively short turn-on and turn-off time, determined by the time of heating and cooling of the thermomagnetic material, which with a small thickness of a layer of this material can be quite small. In addition, an adjustable heat pipe provides automatic switching on and switching off of the heat flux at a predetermined value of the maximum allowable temperature for the object to be cooled with a suitable choice of the thermomagnetic material (with the corresponding Curie point) and no flow control signals. A wide selection of thermomagnetic materials provides the ability to trigger an adjustable heat pipe over a wide temperature range.

Claims (2)

1. Adjustable heat pipe, containing a hermetically sealed enclosure partially filled with coolant, with evaporation, transport and condensation zones, divided into compartments by means of a transverse partition fixed in the transport zone and having a central opening blocked by a control valve, so as to simplify the design while increasing speed, inside the body there is an axial movement of a magnet, kinematically connected to the valve, and a part of the body in the evaporation zone is made of a thermomagnetic material and is mechanically connected through an elastic element with a magnet. 2. A pipe according to claim 1, wherein the partition is made with a cylindrical section of non-magnetic material introduced into the evaporation zone and having windows, and the valve is made as a glass of non-magnetic material, sliding over cylindrical section also having on the side wall of the window, coinciding with the windows of the partition in one of the extreme positions of the valve. Sources of ish}) forms taken into account in the examination 1. US patent Ng 341405O, cl. 165-32, 1967, 2. Low temperature heat pipes for aircraft. Under, ed. Voronin G, I., M ,, Mechanical Engineering, 1976.