JPS6332374Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thermally driven engine that is rotationally driven by heating and cooling a shape memory belt.

The shape memory effect, which is one of the properties of shape memory alloys, is literally the property of a material remembering its original shape, and refers to the phenomenon in which something deformed at a certain temperature returns to its original shape when the temperature is raised. . It is well known that this phenomenon is caused by thermoelastic martensitic transformation, and there is a typical device that extracts the recovery force when the shape memory alloy returns to its original shape as mechanical energy. It is a thermally driven engine.

The temperature at which the martensitic transformation occurs can be set almost arbitrarily by appropriately selecting the composition, processing conditions, and heat treatment conditions of the shape memory alloy, and the temperature at which the martensitic transformation occurs can be set almost arbitrarily.
Reverse transformation can also occur in a temperature range of several tens of degrees Celsius. A heat-driven engine using such a shape memory alloy can effectively recover thermal energy from geothermal heat, factory exhaust heat, solar heat, etc., or low-quality thermal energy from heated wastewater from these sources, thereby avoiding the current energy depletion. It can be said to be a very effective method when

Figure 1 shows the Utility Application filed in 1983 by the present applicant.
152500 (Utility Model Application Publication No. 57-73381) is a side view of a thermally driven engine. A shape memory belt 3 made of a shape memory alloy is hung between pulleys 1 and 2 of the same diameter (or different diameters), and drive pulleys of different diameters (or the same diameter) are each fixed coaxially with the pulleys 1 and 2. A drive belt 6 made of a material that is less likely to shrink due to heat is placed between the drive belts 4 and 5. The idler pulleys 7 and 8 are pulleys for pressing a part of the shape memory belt 3 so that the shape memory belt 3 is sufficiently immersed in the cooling water in the cold water tank 9. Hot water for heating the shape memory belt 3 is supplied to the hot water tank 10.
The shape memory belt 3 stretched between the pulleys 1 and 2 is stretched out from the memorized shape, and when hot water is supplied to the hot water tank 10, the shape memory belt 3 that is attached to the hot water contracts at the same time. Generates shape recovery force. This shape recovery force is based on pulley 1,
2, the signal is transmitted from the shaft to the drive pulleys 4 and 5, and further transmitted to the drive belt 6. At this time, since the drive pulleys 4 and 5 have different diameters, the tension of the drive belt on the small diameter drive pulley 5 side exceeds the tension of the drive belt on the large diameter drive pulley 4 side, and the thermal drive engine moves in the direction of the arrow. Rotate to. The shape memory belt 3 that has passed through the heating section reaches the cooling section as the engine rotates, but the rotation speed of the pulleys 1 and 2 differs depending on the diameter ratio of the drive pulleys 4 and 5, Since the pulley 2 rotates more, the shape memory belt 3 is cooled while passing through the cold water tank 9 and is stretched in a low temperature state. The force required for stretching is
This force is quite small compared to the shape recovery force. As described above, the shape memory belt 3 is repeatedly heated and cooled, contracts and expands repeatedly, and rotates continuously as long as a heating source and a cooling source are available.

Such a heat-driven engine does not cause much of a problem when operating at extremely low speeds, but when the rotation speed increases a little, the shape memory belt 3 scrapes out the cold water in the cold water tank 9 and transfers the cold water to the hot water tank 10. It will be transferred to. In this case, the temperature of the hot water in the hot water tank 10 decreases, and there is a drawback that the output of the heat-driven engine cannot be sufficiently extracted.

The purpose of the present invention is to solve the above-mentioned drawbacks and to propose a practical heat-driven engine with a simple structure.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a side view of an embodiment of a heat-driven engine with a drain pulley according to the present invention. The same numbers as in FIG. 1 indicate the same parts, and since the rotation principle is exactly the same, a detailed explanation of the engine structure and operation will be omitted. While the thermally driven engine is running,
As mentioned above, since the shape memory belt 3 scrapes out the cold water in the cold water tank 9, the drain pulley 11 shown in the figure is added to prevent this. Therefore, the shape memory belt 3 passes through the idler pulley 8, passes through the drain pulley 11 from above, and then enters the pulley 2. Therefore, the shape memory belt 3 changes its direction significantly when moving to the drain pulley 11 after passing through the cold water tank 9.
Even on top of 1, there is a big change in direction. As a result, the water adhering to the shape memory belt 3 can be sufficiently shaken off, and the amount of water carried into the hot water tank 10 by the shape memory belt 3 can be extremely reduced. Since hot water can be prevented from being mixed in, the hot water can be kept at a high temperature, and the heat-driven engine can effectively utilize hot water to obtain high output.

The embodiments of the present invention have been described above in detail.According to the present invention, it is possible to prevent the cold water from flowing out from the cold water tank 9, and it is very effective in producing a highly efficient heat-driven engine.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional heat-driven engine;
The figure is a side view of an embodiment of a heat-driven engine with a drain pulley according to the present invention. In the figure, 1, 2: pulley, 3: shape memory belt,
4, 5: Drive pulley, 6: Drive belt, 7, 8:
Idler pulley, 9: Cold water tank, 10: Hot water tank, 1
1: Drainer pulley.

Claims (1)

[Scope of utility model registration request] A belt made of a shape memory alloy element is hung between two rotatable pulleys, a part of the belt is heated,
In a thermally driven engine that rotates the pulley by cooling the other part, there is a liquid tank that stores a high temperature liquid for heating and in which a part of the belt is immersed, and a liquid tank that stores a low temperature liquid for cooling and that is for the belt. a liquid tank in which the other part of the belt is immersed; two idler pulleys that guide the belt into the upper liquid tank of the two types of liquid tanks; 1. A heat-driven engine with a drain pulley, comprising: a drain pulley located in the direction of travel of the belt for rapidly changing the direction of travel of the belt.