SU1267039A1 - Thermal drive - Google Patents

Abstract

THERMAL ACTUATOR containing a variable volume chamber filled with light boiling liquid and its vapor with heating and cooling zones and with an elastic wall connected to the power extraction rods, mainly in the form of a bellows, as well as with a capillary-porous structure placed inside the chamber, characterized in that in order to reduce the inertia, it is additionally equipped with a heat pipe placed in a capillary-porous structure, in the heating zone of the chamber, an electric heater and controlled by a heat pipe to remove heat from the chamber, and and cooling and combined the latest.

Description

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The invention relates to mechanical engineering, namely, to the conversion of thermal energy into mechanical energy, and can be used as the executive body of automation units, mainly in autonomous systems operating in aggressive environments or in vacuum.

The aim of the invention is to reduce the inertia.

Reducing the inertia of the thermal drive is ensured by heating the working fluid directly in a capillary-porous structure inside its chamber, carrying out intensive cooling using a controlled heat pipe only after heating stops, and also by eliminating transporting the working fluid from the cooling zone of the chamber heating due to the combination of these zones.

The drawing shows a thermal actuator, a general view.

The thermal actuator contains a working fluid filled with boiling liquid and its vapor, for example, distilled water in a state of saturation, a variable volume chamber I with a common heating and cooling zone 2. The chamber 1 has an elastic wall in the form of a bellows 4 connected to the stem 3. Inside the chamber 1 a capillary-porous structure 5, for example, of porous ceramic, is placed to evenly distribute the working fluid

in zone 2. In the capillary-porous structure 5 in zone 2, an electric heater 6 is placed. Chamber 1 is connected to a controlled heat pipe 7, zone 8 of which is evaporated

placed inside the chamber 1 and covered by a capillary-porous structure 5. The zone 9 of the condensation of the heat pipe 7 is outside the limits of the chamber 1. In the area 10 of the transportation of the condensate of the heat pipe 7 there is a bubble pump 11.

Thermal actuator works as follows.

An electrical voltage is applied to the electric heater 6, as a result of which the working fluid in a capillary-porous

structure 5 is heated to a predetermined temperature and evaporated until the required pressure is established inside the bellows 4. As the pressure inside the bellows 4 increases, the latter expands, moving the power take-off rod 3. To return the rod 3 to its original position, the electric heater 6 is turned off, the bubble pump 11 of the heat pipe 7 is turned on, which supplies the heat transfer medium of the latter from the condensation zone 9 to the zone 8

evaporation. As a result of intensive cooling of zone 2 of chamber 1, the pressure inside the bellows 4 drops, and the capillary-porous structure 5 absorbs the condensed working fluid. When the pressure inside the bellows 4 decreases, the latter is compressed under the action of the elastic forces of its walls and moves the rod 3 to the initial position.

Claims (1)

THERMAL ACTUATOR containing a variable-volume chamber filled with low-boiling working fluid and its steam with heating and cooling zones and with an elastic wall connected to the power take-off rod mainly in the form of a bellows, as well as with a capillary-porous structure located inside the chamber, characterized in that, with In order to reduce inertia, it is additionally equipped with a capillary-porous structure in the heating zone of the chamber, an electric heater and a controlled heat pipe to remove heat from the chamber, and the heating zone and oh the landings of the latter are combined. S <1 ABOUT Sae With