JPH0327748B2 - - 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 and its problems) The liquid Stirling engine is based on IECEC's 1982
9291, 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 the heater 10, and the low temperature space 9 is cooled by heat radiation by the fins 11 or 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.

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. Its output is a low output of 10W at most.

(Technical Problem of the Present Invention) A technical problem of the present invention is to solve the problems of the prior art described above.

(Technical Means of the Present Invention and Its Effects) In order to solve the above-mentioned technical problem, the present invention provides at least a pair of output cylinders of a hydraulic Stirling engine with pistons having output rods so that their insides are opposed to each other. In addition, the two low-temperature spaces are communicated through a throttle valve, and technical means are adopted to operate both engines with a 180-degree phase difference.

This means that 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 the working gas sealed in the working space is Even if the pressure is increased, it is balanced by the actuator.
Therefore, the output can be increased. In addition, by using a throttle valve, the working gas pressures of the paired engines can be raised to the same pressure at the same time, so the actuator piston is always centered in the center, making it easy to start, and the intermediate pressure is maintained even during engine operation. Since these are equal, the loads acting on the left and right sides of the actuator piston are equal, and the piston moves smoothly.

An embodiment of the present invention is shown in FIG. 1. Since the main body of the liquid Stirling engine is substantially the same as the example shown in FIG. 2, the reference numerals used in FIG.
The explanation will be 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.

In the example of FIG. 2, a heating wire is used as the heater 10, but in the example of FIG.
is supplied to the high temperature space 8, and the cooling fins 11 are surrounded by cooling water to lower the temperature of the low temperature space 9.

The low-temperature spaces 9, 9 of both engines 1 are made conductive through a passage 21 having a throttle valve 20. Throttle valve 2
0, the degree of opening is adjustable and can be fully closed. A fixed orifice 22 is provided in parallel to the throttle valve 20. Thus, even when the throttle valve 20 is closed, both cold spaces 9, 9 are closed to the orifice 22.
conduction through. This fixed orifice 22 is
The intermediate pressures of the fluctuating pressures of both engines 1, 1 are made equal, the pressure width and intermediate pressure acting on both ends of the piston 15 are made equal, and the movement of the piston 15 is made smooth.

Furthermore, by changing the opening degree of the throttle valve 20, the pressure in the working space of both engines 1, 1 changes (180° phase).
By changing the amplitude of piston 1 as shown in Fig. 3,
By changing the force acting on 5, you can control its output.

(Effects) In the present invention, since the pressure of the working gas can be increased, high output can be obtained. Further, the communication between the two low-temperature spaces by the throttle valve including the fixed orifice can simultaneously raise the working gas pressures of both engines to approximately the same pressure even if the degree of heating to the two high-temperature spaces differs. this is,
Facilitates engine starting and smoothes actuator piston movement. Furthermore, the pressure amplitude of the engine can be changed by changing the opening degree of the throttle valve, and the output can be adjusted.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an example of the present invention, FIG. 2 is an explanatory diagram of a conventional example, and FIG. 3 is a diagram illustrating pressure changes due to throttle valves in the working spaces of both engines. In the figure: 3, 4...Cylinder, 5, 6...Liquid piston, 8...High temperature space, 9...Low temperature space, 12...
...Output cylinder, 13... Actuator, 14
...output rod, 15...piston, 20...throttle valve, 22...fixed orifice.

Claims (1)

[Claims] 1. The output cylinder of 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 the output cylinder, It communicates with one chamber of an actuator having a piston inside and an output rod connected to the piston, further communicates the output cylinder of another hydraulic Stirling engine with the other chamber, and A liquid Stirling engine characterized in that the low-temperature space of the Stirling engine can be communicated with through a throttle valve, and both liquid Stirling engines are operated at a phase of 180 degrees (angle).