SU1268795A1 - Step thermal engine - Google Patents

Description

The invention relates to the conversion of thermal energy of low-potential sources into mechanical energy of intermittent rotary motion, namely, thermal stepping motors, and can be used to create automation units for heat and power plants.

The purpose of the invention is to increase the specific mono-ness and efficiency.

FIG. 1 shows the engine, section, in a position in which the propulsive element of the working body is engaged with the power take-off shaft; in fig. 2 - the same, in the position in which the power take-off shaft is engaged with the locking element; in fig. 3 shows section A-A in FIG. I.

The engine includes a housing 1 and an axially spring-loaded axially mounted therein by means of springs 2, a working member in the form of a heat pipe 3 made of an alloy with a thermal mechanical memory (for example, a titanium-nickel alloy, where 53-54% nickel, the rest is titanium ), filled with capillary material 4. Heat pipe 3 is made of two series-connected parts 5 and 6, with the thermomechanical memory of part 5 expressed in torsion around the longitudinal axis, and part (5 in reducing its length. The engine also contains sources of heating and cooling in view coaxially installed relative to the pipe 3 hot and cold heat exchangers 7 and 8, respectively, as well as a switch made in the form located between the last heat exchanger 9 of the pipe 3. The heat exchangers 7 and 8 are also made in the form of heat pipes. the difference of the lengths of the pipe 3 in stretched and compressed positions.

In the housing 1 on bearings 10 mounted shaft 11 power takeoff. A propulsive element 12 mounted with the shaft 11 of the power take-off is rigidly connected to the working body - pipe 3. The engine also has a fixed element in the form of a cylinder 13 for holding the shaft 11 when the tool is idle, pipe 3. On the inner surface of the housing 1 and on the outer surface of one end of the shaft 11 are longitudinal grooves 14 and 15, respectively. The cylinder 13 is movably mounted in the longitudinal direction between the springs 2 and the propulsive element 12 and is provided with outer longitudinal projections 16 installed in the slots 14 of the housing 1 and internal circumferentially uniformly spaced longitudinal projections 17 for cooperating with the grooves 15 of the shaft 11 while the worker is idling organ - pipe 3. The number of internal projections 17 of the cylinder 13 is equal to

the number of engine chaps per one complete revolution of the shaft 11. The propulsive element 12 is made in the form of a disk 18 with longitudinal projections 19 against the slots 15 of the shaft 11.

The engine works as follows. The heat exchange protrusion 9 (Fig. 1) of the pipe 3 contacts the hot heat exchanger 7, is heated, transferring heat to the pipe 3, part 5 of which at a temperature, for example,

 from 40 to 60 ° C rotates at a certain angle (schag) and with the help of the propulsive element 12 rotates the power take-off shaft 11, remaining in the leftmost position (Fig. 1) with further increase

5 temperatures, for example, up to 70 ° C. At this time, heated by zio of a certain temperature, for example, 70 ° C, part 6 of pipe 3 is reduced (Fig. 2), heat exchanger projection 9 moves from the hot heat exchanger 7 to the cold heat exchanger 8, propulsive

0, the element 12 is disengaged from the shaft 11, and, by moving the cylinder 13, engages the latter in engagement with the shaft 11, compressing the spring 2. With further cooling, for example, to 60-40 ° C

5, the part 5 of the pipe 3, together with the propulsive element 12, rotates in the opposite direction to the initial predetermined position, remaining therein with a further decrease in temperature, for example, to 30 ° C. At this time, the part 6 of the pipe 3 adopts the appropriate shape (FIG. 1), the propulsive element 12 engages with the power take-off shaft 11 and the spring 2 due to the compressive force of the c-cylinder 13, releasing the latter from the engagement with the shaft 11. Heat exchanger 9, in contact with a hot heat exchanger 7, heats up, transferring heat to pipe 3. Next, the described cycle repeats.

Claims (3)

Invention Formula 0 1. A thermal stepping motor, comprising a housing, an axially spring-loaded working body in an alloy of thermomechanical memory, heating and cooling sources with a switch mounted on the body, a power take-off shaft mounted with the possibility of coupling with the latter, and a fixed element and a fixing element for holding the shaft 0 at idle working body, characterized in that, in order to increase the power density and efficiency, the working body is made in the form of a heat pipe of two series-connected parts, the memory of one of which is expressed in the reduction of the length, 5a, the other memory is in torsion around the longitudinal axis, the sources of heating and cooling are made in the form of heat exchangers coaxially installed with respect to the pipe, and the switch is arranged in the form of a heat exchanger projection between the latter. 2. Motor no. 1, characterized in that longitudinal grooves are made on the inner surface of the housing and on the outer surface of one shaft end, the locking element is designed as a cylinder movable in the longitudinal direction and installed in the grooves between the spring and the propulsive element body outer longitudinal protrusions and internal equally spaced circumferentially longitudinal protrusions to interact with the grooves of the shaft when idle during the working body, and the number of internal protrusions is equal to the number of engine chucks for one full revolution of the shaft. 3. The engine according to claim 1, characterized in that the propulsive element is made in the form of a disk with longitudinal projections against the shaft grooves. / .З