JPH0318029B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a liquid-type Stirling engine, and more specifically, it is used to improve the output and thermal efficiency of a liquid-type Stirling engine.

(Prior art) The hydraulic Stirling engine is based on IECEC's 1979
9239 and the report of the 17th convention in 1982, it is publicly known, and its basic form is shown in FIG.

The liquid Stirling engine 1 has a high-temperature space 8 and a low-temperature space 9 that communicate with each other via a heat storage device 7 by means of liquid pistons 5 and 6 in a pair of cylinders 3 and 4 that are in a conductive relationship with each other through a passage 2. It is defined within cylinders 3 and 4. The high temperature space 8 is heated by a heater 10, and the low temperature space 9 is heated by fins 11 or cooled by cooling water. Working gas (air, helium, etc.) is sealed in both spaces 8 and 9. 12 is an output cylinder which communicates with the passage 2 and which has liquid pistons 5 and 6.
is generally made with water.

The heater 10 is heated to expand the working gas in the high temperature space 8, while the low temperature space 9 side is cooled by a cooler 11 such as a fin or cooling water, so the working gas in the space 9 contracts. . As a result, the water surface of the liquid piston 5 and the water surface of the liquid piston 6 are different from each other in the passage 2.
Due to the conduit resistance, the cylinder moves with a phase difference of approximately 90 degrees, and its output is taken out as a change in the liquid level within the output cylinder 12.

(Problems with the Prior Art) In the conventional hydraulic Stirling engine shown in FIG. 2, the pressure of the working gas in the working space (high-temperature, low-temperature space) is determined by the water head in the output cylinder, and high pressure cannot be expected. Even at the highest limit of the liquid piston, dead volumes remain in both spaces, making it impossible to maintain a large pressure ratio in the working spaces. Due to these reasons, the output is at most
It has a low output of 10W. Furthermore, the heat in the high-temperature space that serves as the expansion space is transferred to the liquid such as water that forms the liquid piston, raising the water temperature of the liquid piston on the low-temperature space side, which ultimately impedes cooling of the low-temperature space, resulting in poor thermal efficiency.

(Technical Problems and Means of the Present Invention) A technical problem of the present invention is to solve the problems of the prior art described above, and in order to solve the problems, the output cylinders of at least a pair of hydraulic Stirling engines. are connected by means of a piston with an output rod to an actuator whose internal parts are opposed chambers, and technical means are used to operate both engines with a phase difference of 180 degrees. Furthermore, a float made of a heat insulating material is used in the working space.

The output cylinders of each Stirling engine are communicated with the chambers facing each other in the actuator, and the water, etc. in the cylinders are made to face each other via the pistons, so that even if the pressure of the working gas sealed in the working space is increased, the actuator remains stable. balance it out. Therefore, the output can be increased. Furthermore, the float minimizes the dead volume of the working space and prevents heat from the heater from being transferred to the cooling space, resulting in high thermal efficiency.

(Example) An example of the present invention is shown in FIG. 1. Since the main body of the hydraulic Stirling engine is the same as the example shown in FIG. 2, the reference numerals used in FIG. omitted.

Output cylinder 1 of paired hydraulic Stirling engine 1
2 are opposed to each other via an actuator 13. The actuator 13 creates opposing chambers 16, 17 by means of a piston 15 with an output rod 14.
A seal 18 of the piston 15 seals both chambers 16, 17, one chamber 16 communicating with the output cylinder 12 of one engine and the other chamber 17 communicating with the output cylinder 12 of the other engine. Thus, both output cylinders 12 face each other via the piston 15.
As a result, it becomes possible to fill the working space with high-pressure working gas, and the engine output can be increased. of both institutions
Operation with a 180 degree phase difference causes the piston 15 to reciprocate from side to side, making it possible to extract high output to the outside.

Floats 19, 2 made of heat insulating material in both working spaces
Place 0. The material of the floats 19 and 20 is as follows:
Asbestos-based materials with excellent heat resistance are preferred. The shape of the floats 19, 20 is such that when the liquid pistons 5, 6 assume their uppermost positions, the hot and cold spaces 8, 9
The dead volume of the pipe shall be minimized. float 1
9 and 20 also prevent heat leak from the high temperature space 8 to the liquid piston 5 and improve thermal efficiency.

(Effects) The present invention can be easily applied to existing hydraulic Stirling engines because the actuator, which has a simple structure, is simply connected to the output cylinders of both engines. Further, the seal used in the actuator is always wet and has good durability.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a conventional example. In the figure, 3, 4...Cylinder, 5, 6...Liquid piston, 7...Regenerator, 8...High temperature space, 9...Low temperature space, 12...Output cylinder, 13...Actuator, 14... Output rod, 15...piston.

Claims (1)

[Scope of Claims] 1. A liquid Stirling engine in which a high temperature space and a low temperature space are communicated via a heat storage device, and liquid pistons defining the high temperature and low temperature spaces are communicated with each other through a passage and with an output cylinder. The output cylinder of the actuator is communicated with one chamber of an actuator having a piston therein and an output rod connected to the piston, and the output cylinder of another hydraulic Stirling engine is communicated with the other chamber. and rotate the double-hydrostatic Stirling engine 180 degrees (angle)
A liquid Stirling engine characterized by operating in the phase of . 2. The liquid Stirling engine according to claim 1, characterized in that a float made of a heat insulating material is arranged on the water surface of the liquid piston that creates the high temperature and low temperature spaces.