JPH0244043Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an efficiency improving device for a Stirling external combustion engine, which improves thermal efficiency by effectively utilizing the heat generated in the Stirling external combustion engine without letting it escape.

Conventionally, such Stirling external combustion engines were configured to heat or cool the cylinder indirectly through the outer wall of the cylinder, so much of the applied heat was wasted and the efficiency was extremely low. It had the following drawbacks.

In other words, in order to improve the efficiency of a Stirling external combustion engine, it is necessary to have a large temperature difference between the high-temperature section and the cooling section, and it is necessary that the fluctuations of this difference remain constant. To improve this, it is necessary to maintain high temperatures in the high temperature section, and it is also necessary to have a structure that does not cool easily.

Therefore, it is necessary to make effective use of the heat generated by the engine rather than simply escaping it, and improvements such as increasing combustion efficiency, achieving economic efficiency with less fuel, and further reducing pollution are required. Ta.

In view of these drawbacks, the present invention provides heating and cooling effects to the heat medium sealed in the cylinder.
In a Stirling external combustion engine that makes the piston of the body reciprocate, a thermoelectric generator with a large Seebeck effect is wrapped between the outer walls of the high-temperature section and the outer wall of the cooling section, and a heater is placed inside the high-temperature section. It is an object of the present invention to solve the above-mentioned drawbacks by providing an efficiency improvement device for a Stirling external combustion engine, in which the heater is made to generate heat using electricity generated by the thermoelectric generator. One embodiment will be described based on the drawings. Reference numeral 1 denotes a main body of a Stirling external combustion engine, in which a motion conversion mechanism 2 is provided at the lower part, and cylinders 3 and 4 are arranged in parallel at the upper part. The cylinders 3 and 4 are connected by a connecting pipe 5 made of a double pipe with high insulation properties, and a regenerator 6 made of a mesh laminate of heat exchange metal fibers such as copper is interposed in the passage. , connecting pipe 5
A heat medium such as air, helium, or hydrogen is sealed inside.

Also, inside the cylinders 3 and 4 are pistons 7 and 8, respectively.
The pistons 7 and 8 are installed inside the pistons so as to be slidable up and down.
One end of the connecting rods 9, 9a is pivotally attached to the lower part of the connecting rod 9, 9a, and the other end of the connecting rod 9, 9a is connected to a rotating shaft 10, 10a disposed in the motion conversion mechanism 2 through a crank 11, 11a. The vertical movement of the pistons 7 and 8 is converted into rotational movement by pivotally connecting the pistons 7 and 8, and an output shaft 12 is disposed between the rotation shafts 10 and 10a, and the output shaft 12 and the rotation shafts 10 and 10
Gears 13, 14, 14a that mesh with each other are attached to the output shaft 1 to control the rotation of the rotating shafts 10, 10a.
It is made so that it can be transmitted to 2.

Further, one cylinder 3 is configured as a high-heat section 15 and the other cylinder 4 is configured as a cooling section 16, and a combustion device 18 such as a boiler is attached to the outer wall section 17 of the high-temperature section 15, and a combustion device 18 such as a boiler is attached to the outer wall section 19 of the cooling section 16. A cooling device 20 is attached, and a combustion air supply pipe 21 and an exhaust pipe 22 are introduced into the combustion device 18, and a cooling air supply pipe 23 and an exhaust pipe 24 are introduced into the cooling device 20 to supply combustion air. tube 21
and an output shaft 1 in the cooling air supply pipe 23.
The turbo fans 25 and 25a are connected to the combustion engine 2 and rotate at high speed in synchronism, respectively, and the turbo fans 25 and 25a forcefully feed air, and one of the turbo fans 25 and 25a is used for combustion air of the combustion device 18. This improves combustion efficiency and reduces pollution, while the other is designed to enhance the cooling effect of the cooling device 20.

In addition, the inner walls 26 and 27 of the high temperature section 15 and the cooling section 16
A large number of spline-shaped heat transfer fins 28 and 29 are provided protrudingly on each side to improve heat transfer efficiency with respect to the heat medium.

Reference numeral 30 denotes a thermoelectric power generation device (a pair of devices such as alumel, chromel, P-type and N-type semiconductors, etc.) with a large Seebeck effect. The ends 17 and 19 are wound with an insulator interposed therebetween, and the end contacts of the thermoelectric generator 30 are connected to the conductors 31 and 3.
A space 33 is provided in the outer wall 17 of the high-temperature part 15 to communicate with the inside of the cylinder 3, and a heater 34 made of nichrome wire, ceramics, etc. is installed in the space 33.
A storage battery 32 is provided for the heater 34.
are connected via conducting wires 35, 35a, and the heater 34 is heated by the current supplied from the storage battery 32.

Furthermore, if the heat medium such as air or helium sealed in the cylinders 3 and 4 leaks to the outside, the internal pressure will drop, so a vacuum pump 37 with a small pressure gauge and a small vacuum pump with a small pressure gauge are connected to the connecting pipe 5 via the pipe 36. A humulator cylinder 38, a vacuum pump 39, and a dryer 40 are connected to keep the internal pressure constant and stabilize the engine output.

The type of Stirling external combustion engine is not limited to the type shown in the figure, but may be any type such as a horizontal type in which the pistons are arranged horizontally opposite each other, a cylindrical type in which the pistons are arranged coaxially, a swash type using a swath plate, etc. It is.

Next, the operation of the efficiency improvement device for a Stirling external combustion engine according to the present invention will be explained.
moves vertically and reciprocally according to the normal operation of the Stirling external combustion engine, and is converted into rotational motion by the motion conversion mechanism 2, and the power is taken out from the output shaft 12 to various operating parts.

Then, due to the heating action of the high temperature part 15 by the combustion device 18, the thermoelectric power generation device 30 is passed through the outer wall part 17.
When heated, electricity is generated by the Seebeck effect of the thermoelectric generator 30, and this electricity is stored in the storage battery 32, and the electricity is generated from the storage battery 32 intermittently (for example, when 10 electricity amounts are stored, 7 electricity is generated). The discharge is repeated at intervals of several seconds, and the discharge causes the heater 34 inside the cylinder 3 to generate heat (300°C to 1000°C), directly warming the air inside the cylinder 3.

That is, excess heat released outside the cylinder 3 is converted into electricity to directly heat the heat medium inside the cylinder 3.

Normally, when cylinders 3 and 4 are metal bodies, heat tends to flow from cylinder 3 to cylinder 4 at 300°C and 30°C for cylinder 4 and become uniform as a whole, but to prevent this uniformity, In order to make the high temperature section 15 higher and the cooling section 16 lower, a thermoelectric generator 30 with a high Seebeck effect is provided to increase the engine output.

The efficiency increased as a result of the above can be improved to 40% to 45%, compared to the 25% efficiency of a typical gasoline engine and the 20% to 35% efficiency of a typical Stirling external combustion engine.

For example, if the high temperature section 15 is set to 300℃
When the temperature reaches 500℃, 200℃ is extra, so in order to prevent material deterioration and to prevent excess heat from escaping to the outside, the 200℃ heat is absorbed by the thermoelectric generator 30 and stored as electric power. , to protect the material.

However, no matter how large the temperature difference, the higher the efficiency, the material will deteriorate if the temperature exceeds a certain point, so it is necessary to operate the device at a constant temperature of 300°C.

In short, the present invention provides a Stirling external combustion engine in which two pistons are reciprocated by heating and cooling a heat medium sealed in a cylinder. A thermoelectric generator 30 having a large Seebeck effect is wound between the 19, and a heater 34 is disposed inside the high temperature part 15.
4 is made to generate heat using the electricity generated by the thermoelectric generator 30, so the heat that was previously wasted is stored as electric power by the thermoelectric generator 30, and then the heater in the high temperature section 15 is heated. For example, the storage battery 32 can be installed in two places instead of one as in conventional vehicles such as automobiles, so that one has the conventional function and the other has the heat function. The efficiency of the heat engine is improved by exclusively storing the electric power from the electric generator 30 and using 70 to 80% of the electric power to heat the heater 34 and the like in order to further raise the temperature of the high-temperature section 15. The practical effects are enormous, such as being able to contribute to the promotion of the use of Stirling external combustion engines in various fields.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a sectional view of the efficiency improvement device for the Stirling external combustion engine of the present invention, FIG. 2 is a schematic view of the main part, and FIG. 3 is a sectional view of the cooling section. 3 and 4 cylinders, 17 and 19 outer walls, 30 thermoelectric generators, and 34 heaters.

Claims (1)

[Scope of utility model registration request] Heating the heat medium sealed in the cylinder,
In a Stirling external combustion engine that uses cooling to cause two pistons to reciprocate, a thermoelectric generator with a large Seebeck effect is wrapped between the outer walls of the high-temperature section and the cooling section. 1. An efficiency improvement device for a Stirling external combustion engine, characterized in that a heater is disposed in the heater, and the heater is made to generate heat using electricity generated by the thermoelectric generator.