JPS6179842A - Liquid type stirling engine - Google Patents

Abstract

PURPOSE:To enhance the thermal efficiency of an engine, by communicating output cylinders in at least a pair of liquid type Stirling engines with an actuator in which two opposed chambers are defined by a piston 15 provided thereto with an output rod 14, and by driving both engines with a phase difference of 180 deg. therebetween. CONSTITUTION:Output cylinders 12 in a pair of liquid type Stirling engines 1 are opposed to each other through the intermediary of an actuator 13 including two chambers 16, 17 defined by a piston 15 having an output rod 14. One 16 of the chambers is communicated with the output cylinder 12 in one of the engines while the other one 17 of the chambers is communicated with the output cylinder 12 in the other one of the engine. Floats 19, 20 made of heat-insulating materials are disposed in high and low temperature spaces 8, 9 which are communicated through a regenerator 7 in each engine, and are formed such that the dead volumes within the spaces 8, 9 become minimum when liquid pistons 5, 6 come to their highest positions. Further, both engines are driven with a phase difference of 180 deg. therebetween.

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 can be used to improve the output and thermal efficiency of a liquid-type Stirling engine.

(Prior art) The hydraulic Stirling engine was developed by IECEC in 1979.
239 and the report of the 17th convention in 1982, and its basic form is shown in FIG.

The hydraulic Stirling engine 1 uses a liquid piston 5.6 in a pair of cylinders 3, 4 that are in communication with each other through a passage 2 to connect a high-temperature space 8 and a low-temperature space 9 that communicate via a heat storage device 7t to the cylinders 3, 4. Define within. 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. Rain space 8.9
The operating gas (air, helium, etc.) is sealed inside. The output cylinder 12 opens into the passage 2 and into a liquid piston 5.6, generally made of 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 heated by a cooler 21 such as fins or cooling water.
Since it is cooled by 1 Vc, 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 move with a phase difference of approximately 90 degrees due to the pipe resistance of the passage 2, and the output is taken out as a change in the liquid level in the output cylinder 12. .

(Problems with the prior art) In the conventional hydraulic Stirling engine shown in Figure 2, the pressure of the working scum in the working space (high temperature and low temperature spaces) is determined by the water head in the output cylinder, and high pressure can be expected. do not have. Even at the uppermost outer corner of the liquid piston, a dead volume remains in the rain space and the pressure ratio in the working space is large. Due to these reasons, the output is as low as 10W at most. Furthermore, the heat in the high-temperature space, which is the expansion space, is transferred to the liquid such as water that makes up all the liquid pistons, 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) The present invention aims to solve all the problems of the prior art mentioned above. A piston with an output of 1 output is connected to an actuator whose internal parts are facing each other, and both engines are connected to 180
A technical means of operating with a phase difference of 100 degrees is used.

Furthermore, a float 1 made of a heat insulating material is used in the working space.

The output cylinders of each Stirling engine are connected to the chambers facing each other in the actuator, and the water, etc. in the cylinders are made to flow through the pistons, increasing the pressure of the working gas sealed in the working space. is also balanced by an actuator.

This output can be increased. In addition, the float minimizes the dead volume of the working space and prevents the heat of the heater from being transferred to the fully cooled space, resulting in high thermal efficiency.

(Embodiment) An embodiment 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.
Reference numerals used in the figures are indicated, and their explanations will be omitted.

The output cylinders 12 of the paired hydraulic Stirling engines 1 are made to face each other via an actuator 13.

The actuator 13 creates opposing chambers 16, 171-by 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, the Ryogawa cylinder 12 has a piston 1sf7c.
Opposing through. As a result, it becomes possible to enclose high-pressure working scum in the working space, and the engine output can be increased. The operation of the two engines with a 180 degree phase difference causes the piston 15 to reciprocate from side to side, making it possible to take out all of the high output to the outside.

Floats 19 and 20 made of heat insulating material are arranged in both working spaces. As the material for the floats 19 and 20, asbestos-based materials with excellent heat resistance are preferred.

The shape of the float 19.20 is such that when the liquid piston 5.6 assumes its uppermost position, the dead volume of the hot and cold spaces 8.9 is minimized. Float 19, 20i, also
Heat leak from the high temperature space 8 to the liquid piston 5 is prevented and thermal efficiency is increased.

(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. Furthermore, 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 (2)

[Claims] (1) The output cylinder of a hydraulic 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. 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. 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.