JP2003232276A - Shape memory alloy heat engine rotated at high speed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an epoch-making shape memory alloy heat engine rotated at high speed, attaining high speed rotation with a simple mechanism. <P>SOLUTION: In this shape memory alloy heat engine rotated at high speed, two large and small pulleys 1, 2 are rotated by stretching an endless shape memory alloy wire 5 between both pulleys 1, 2 and heating a part of the small pulley 2. The center distance between the pulleys 1, 2 is taken as long as 80 cm or more, and the diameter ratio of both pulleys 1, 2 is made as large as 7:1 or more. Natural cooling in the air is adopted on the large pulley 1 side without requiring a cooling part, and the deformation quantity of the wire 5 deformed along the circumference is large on the small pulley 2 side. The recovery quantity by heating is thereby large, and driving force is increased. In this constitution, even if natural cooling is adopted on the large pulley 1 side, 1000 rpm or more is attained by heating the small pulley 2 side with high temperature steam. The rotating speed can thereby be increased. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed rotation of large and small pulleys using a shape memory alloy wire. 2. Description of the Related Art A heat engine using a shape memory alloy has a structure in which a wire stored in a straight line is wound over two pulleys. A high-temperature heating unit and a low-temperature cooling unit are provided to obtain power, which complicates the structure. The apparatus can be simplified by heating only with high-temperature steam. Further, conventionally, the rotation speed is not mentioned. The present invention has been further studied on a shape memory alloy heat engine that rotates at a high speed, solves such problems, and has a revolutionary high speed rotating shape memory that has a simple mechanism and enables high speed rotation. It aims to provide an alloy heat engine. The gist of the present invention will be described with reference to the accompanying drawings. A heat engine for rotating both pulleys 1 and 2 by rotating an endless shape memory alloy wire 5 between two large and small pulleys 1 and 2 and heating a part of the small pulley 2. By taking the length between the first and second shafts longer than 80 cm and increasing the diameter ratio of the two pulleys 1 and 2 to 7: 1 or more, the large pulley 1 is naturally cooled in the air on the large pulley 1 side without requiring a cooling unit. The pulley 2 side has a small diameter, so that the wire 5 deformed along the circumference has a large deformation amount, and thus the recovery amount by heating is large, so that the driving force increases. And the large pulley 1 side is cooled naturally by 10%.
The present invention relates to a shape memory alloy heat engine that rotates at a high speed, characterized in that it is configured to have a rotation speed of at least 00 rpm and a high rotation speed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention (how to implement the present invention) will be briefly described with reference to the drawings, showing the operation and effects thereof. A heat engine which rotates an endless shape memory alloy wire 5 between two large and small pulleys 1 and 2 to rotate both pulleys 1 and 2 by heating a part of the small pulley 2. Since the distance between the pulleys 1 and 2 is long, and the diameter ratio between the pulleys 1 and 2 is as large as 7: 1 or more, cooling is naturally performed and a cooling unit is not required. In this way, the large pulley 1 allows natural cooling in air,
Since the diameter of the small pulley 2 is small (70 mm), the amount of deformation of the wire 5 deformed along the circumference is large. Therefore, the amount of recovery by heating is increased, so that the driving force is increased and the rotation speed of 1000 rpm or more can be increased. The heating source is high-temperature steam generated by ordinary boiling of water. A specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an example of a prototype. [0010] As shown in FIG.
When heating is started from the degree (the heating position indicated by reference numeral 3), rotation occurs in the direction of arrow 4 in the figure. Heating utilizes high temperature steam. The rotation speed of the small pulley becomes 1000 rpm or more. The life of the wire 5 is extremely long, and there is no abnormality even when rotated for half a day. The connection of the wire 5 is carried out by crimping and fixing both ends into a copper pipe having a small diameter and a length of 4 to 5 mm from the outside. The specifications of the prototype are shown below. Specifications: Shape memory alloy wire: NiTi commercial product, diameter 1.0mm Small pulley: Aluminum, diameter 70mm, thickness 8.0mm Large pulley: use of bicycle rim, diameter 520mm Distance between axes: 800mm or more, axle support The present invention is not limited to the present embodiment, and the specific configuration of each component can be appropriately designed. Since the present invention is constructed as described above, the shape memory alloy heat engine itself has hardly been put to practical use, and thus the mechanism is simple and high-speed rotation is possible. The application examples will be expanded, resulting in a revolutionary high-speed rotating shape memory alloy heat engine that is extremely practical. That is, the heat source only needs to be at least 60 ° C., the apparatus only needs to use high-temperature steam, a cooling unit is unnecessary, natural cooling is sufficient, and high-speed rotation can be realized with a simple configuration. A high-speed rotating shape memory alloy heat engine.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic structural explanatory view showing a basic structure of the present embodiment.
(“Schematic configuration explanatory view” of a prototype machine) showing rotation in a direction of an arrow at a heating position indicated by reference numeral 3. [Description of Signs] 1 Small pulley 2 Large pulley 5 Wire

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[Procedure amendment] [Submission date] February 18, 2002 (2002.2.1
8) [Procedure amendment 1] [Document name to be amended] Description [Item name to be amended] Explanation of sign [Correction method] Change [Content of amendment] [Explanation of sign] 1 large pulley 2 small pulley 5 wire

Claims (1)

Claims 1. A heat engine for rotating an endless shape memory alloy wire between two large and small pulleys and heating both of the small pulleys to rotate both pulleys, wherein By increasing the distance between the shafts by 80 cm or more and increasing the diameter ratio of both pulleys to 7: 1 or more, the large pulley side is naturally cooled in the air without a cooling unit, and the small pulley side has a small diameter. As a configuration in which the amount of deformation of the wire deformed along the circumference is large, and thus the amount of recovery by heating is large, the driving force is increased. By heating the small pulley side with high-temperature steam, the large pulley side A high speed rotating shape memory alloy heat engine characterized in that it is configured to have a rotation speed of 1000 rpm or more even if natural cooling is performed.