JPH0319903B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot gas engine having a displacer-like mechanism for moving gas between hot and cold spaces. Generally, gas is moved by a displacer that moves within a space within a cylinder, and a specific example of this type of device will be described with reference to FIG.

In FIG. 1, a displacer 2, a piston 3, a displacer rod 4 and a piston rod 5 are provided for reciprocating movement within a cylinder 1 of a hot gas engine. As the displacer 2 descends, the low-temperature gas that has entered the low-temperature space 6 is pushed out, passes through the cooler 7, and as it passes through the regenerator 8 and heater 9, it is heated and becomes high-temperature gas, which enters the high-temperature space 10. At this time, since the gas expands, the pressure increases and pushes the piston 3 downward. When the displacer 2 rises, the above is reversed, and the output is finally taken out from the drive mechanism (not shown) through the piston rod 5, and part of it is sent through the gas spring 11 and the displacer rod 4. It becomes the force that moves the displacer 2.

In this case, if lubricating oil is used in the piston 3 and an attempt is made to prevent gas leakage, the oil will be carried to a high-temperature space by the movement of gas, where it will deteriorate due to the heat and become inside the equipment. It has the disadvantage that it can accumulate on the gas and cause problems such as blocking gas passages. As a conventional measure against this problem, the sealing ring is made of carbon, Teflon, or other materials mixed therein, without the use of oil. However, all of these methods have the disadvantage that they are not sufficient to prevent gas leakage or that the sealing ring wears out quickly.

The present invention provides a solution to this problem and provides a gas engine in which oil does not deteriorate even when a sufficient amount of oil is supplied to sliding parts such as pistons.

Furthermore, although the heat medium in a hot gas engine is usually filled with hydrogen or helium, which has good characteristics, the present invention can be used to compress air or a refrigerant using this hot gas engine, or In order to make it easier to replenish gas leaks, it may be desirable to fill the parts that do not serve as a heat transfer medium with a gas other than hydrogen or helium.

The present invention allows gases other than hydrogen and helium to be filled in parts that do not function as heat carriers, making it possible to use compact air compressors, compact refrigerators, or air to prevent gas leakage. It is possible to obtain an engine that can be easily refilled with gas.

Hereinafter, the hot gas engine of the present invention will be explained along with examples. 2 and 3 show an embodiment of the invention in which a piston rod 5 is connected to a piston 12 of a compressor and a space 1
The air or refrigerant contained in the valve 3 is sucked in through the valve 14, compressed here, and discharged through the valve 15. A high temperature space 10 is formed by the cylinder 1 and the displacer 2, and the high temperature space is formed on the opposite side of the high temperature space 10 with the displacer 2 as a boundary. The low-temperature space includes a space 16 surrounded by the cylinder 1, the displacer 2, the displacer rod 4, and the first diaphragm 18, and the cylinder 1 and the first diaphragm 1.
8, a space 20 surrounded by the piston 3 and the displacer rod 4; a space 21 surrounded by the cylinder 1, the piston 3, and the second partition plate 19; the cylinder 1;
It is divided into a space 17 surrounded by the piston rod 5. Also, a heater 9 communicating with the high temperature space 10 side, a cooler 7 and a heat exchanger 8 communicating with the space 16
There is a side road with a side road. By doing so, the first partition plate divides the high-temperature space 10 and space 16 filled with a working gas such as hydrogen or helium, and the spaces 20 and 21 filled with working gas and lubricating oil. Further, the spaces 13 and 17 filled with air or refrigerant gas are connected to the spaces 20 and 17 by the second partition plate.
It is divided into 21. If the flexible first diaphragm 18 is made of a material that does not allow gas or liquid to pass through, such as metal, it will not stretch as much, and the shape of the diaphragm will increase the dead space in which the piston does not operate, causing the engine to Output drops significantly. Therefore, the flexible first partition plate 18 is made of a material such as rubber with high elongation. Although this is breathable, liquids such as lubricating oil cannot pass through it, so working gases such as hydrogen and helium can pass through the first partition, but the space 2
The lubricating oil contained in spaces 0 and 21 does not flow into the space 16 and the high temperature space 10. By the way, space 1
Air or refrigerant contained in 3, 17 and space 1
Since it must be separated from the hydrogen or helium contained in 0, 16, 20, 21, it is necessary to enter the spaces 13, 17 by means of a flexible second diaphragm 19 made of non-porous material. The air or refrigerant contained therein will not mix with the working gas, such as hydrogen or helium. The second partition plate 19 is a part that does not significantly affect the output of the engine, and the purpose can be satisfied even if it is made of a material that does not allow gas to pass through. By employing the structure described above, it is possible to separate the spaces 10 and 16 containing hydrogen or helium from the spaces 20 and 21 containing hydrogen or helium and oil, thereby preventing oil from penetrating into the high-temperature space 10. This prevents the engine from deteriorating and causing engine trouble.
Also, space 2 containing hydrogen or helium and oil
0, 21, and a space 13 containing air or refrigerant.
17 can be separated, and the engine and compressor can be directly connected to achieve a compact configuration.

Further, as another embodiment of the present invention, the following may be used depending on the shape of the engine. That is, as shown in FIG.
In an engine having a sliding configuration along the radial axis, the flexible first diaphragm 18 is not provided between the displacer rod 4 and the cylinder 1 as shown in FIG. Cylinder 1 as shown
In this case, the first partition plate 18 can be formed into a disk shape, and the structure is simple and durable. All other structures and effects are the same as in the previous embodiment.

Further, different embodiments of the present invention will be described. This embodiment has the following structure added to the above embodiment. That is, in FIG. 5, a tank 26 provided with a flexible third partition plate 25 is connected so that there is no difference in average pressure between the spaces 16 and 20 and the volume added to each space can be changed. ,
Similarly, there is no difference in average pressure between 21 and 17,
A tank 28 provided with a flexible fourth partition plate 27 is connected so that the volume added to each space can be changed.

By adding the above structure, when the load of the engine changes, the average value of the operating pressure exerted on the piston 3 changes accordingly. 2 partition plate 19
are pushed to one side, or the first partition plate 18 and the second partition plate 1
9 can operate normally without any difference in pressure between the two sides.

The hot gas engine of the present invention has a side path in which a high-temperature space and a low-temperature space are divided by a displacer that moves within a cylinder, and a heater is disposed in the high-temperature space and a cooler is disposed on the low-temperature space side. a first diaphragm is provided between the displacer rod in the low temperature space and the inner wall surface of the cylinder, and the first diaphragm is made of a material that is at least breathable and impermeable to lubricating oil. , furthermore, the piston in the low temperature space
A second diaphragm is provided between the rod and the inner wall surface of the cylinder, the second diaphragm is made of at least a non-breathable material, and the first diaphragm is the border on the side communicating with the high temperature space. Fill the space with working gas,
Working gas and lubricating oil are sealed in a space surrounded by the first partition plate and the second partition plate, and lubricating oil and air or a refrigerant are filled in the other space bordering on the second partition plate. Therefore, the lubricating oil does not enter the high-temperature space and deteriorate and cause engine trouble, and the engine and the compressor can be directly connected to each other and have an excellent effect of being compact.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of a conventional hot gas engine, FIG. 2 is a partial cross-sectional view of a hot gas engine according to the first embodiment of the present invention in which two stages of flexible partitions are provided, and FIG. The figure is a sectional view of the compressor connected to the one shown in Fig. 2, Fig. 4 is a partial sectional view of a hot gas engine showing a second embodiment of the present invention, and Fig. 5 is a third embodiment of the present invention. It is a partial sectional view of a hot gas engine showing. 1...Cylinder, 2...Displacer, 3...
... Piston, 10 ... High temperature space, 12 ... Piston of compressor, 18, 19 ... Flexible first partition plate,
Second bulkhead.

Claims (1)

[Scope of Claims] 1. A side path in which a space within a cylinder is divided into a high temperature space and a low temperature space by a movable displacer, and a heater is arranged on the high temperature space side and a cooler is arranged on the low temperature space side. a first partition plate is provided between the displacer rod in the low temperature space and the inner wall surface of the cylinder, and the first partition plate is made of a material that has at least air permeability but does not allow lubricating oil to pass therethrough. Further, a second diaphragm is provided between the piston rod of the low-temperature space and the inner wall surface of the cylinder, and the second diaphragm is made of at least a non-breathable material. institution. 2. A working gas is sealed in a space on the side communicating with the high temperature space with the first partition plate as a boundary, and a working gas and lubricating oil are sealed in a space surrounded by the first partition plate and the second partition plate. 2. The hot gas engine according to claim 1, wherein the other space separated by the second partition plate is filled with lubricating oil and air or a refrigerant.