JPH04265452A - Stirling engine - Google Patents

Abstract

PURPOSE:To increase output through mechanical reduction and enhancing the efficiency at the time of heat exchange. CONSTITUTION:A diaphragm 2 is arranged in a displacer cylinder 1, and the inside is partitioned into two chambers 3, 4, while a gas passage communicating the two chambers 3, 4 with each other between the diaphragm 2 and the displacer cylinder 1 is arranged. In one chamber 3 a cooler 6 is provided while in the other chamber 4 a heater is provided, and a regenerator 8 is provided inside the gas passage 5. To one chamber 3 a power cylinder 10 having a built-in power piston 9 capable of moving freely is connected. When the diaphragm 2 is displaced, gas in the chamber 3 moves in the chamber 4 via the regenerator 8 inside the gas passage 5 while gas in the chamber 4 moves in the chamber 3 via the regenerator 8 therein. Variation in gas pressure is taken out as motive power through the power piston 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Stirling engine, and more particularly to a Stirling engine capable of increasing output by reducing mechanical loss.

0002

BACKGROUND OF THE INVENTION Conventionally, this type of Stirling engine has been constructed as shown in FIG. That is, in this Stirling engine, a displacer piston 22 is movably provided in a displacer cylinder 21, and the inside of the displacer cylinder 21 is divided into two chambers, a cooling chamber 23 and a heating chamber 24, by the displacer piston 22. A gas passage 25 communicating between the cooling chamber 23 and the heating chamber 24 is formed between the outer circumferential surface of the displacer cylinder 22 and the inner circumferential surface of the displacer cylinder 21 .
A cooler 26 is attached to the side, and a heater 27 is attached to the heating chamber 24 side.

The cooling chamber 23 includes a power cylinder 30 in which a power piston 29 is movably provided.
are connected to each other, and this power piston 29 is connected to a crankshaft 35 via a connecting rod 33.
A flywheel 36 is connected to the tip of the crankshaft 35. Further, in the cooling chamber 23, a slide guide 3 movably supports a slide shaft 31 connected to the displacer piston 22.
2 is attached, and the rear end of this slide shaft 31 is connected to the crankshaft 35 via a connecting rod 34.

When the displacer piston 22 moves downward in the figure, the displacer cylinder 2
The gas in the heating chamber 24 of No. 1 moves to the cooling chamber 23 side via the gas passage 25, is cooled by the cooler 26 on the cooling chamber 23 side, and low-temperature gas accumulates in the cooling chamber 23. become.

On the other hand, when the displacer piston 22 moves upward in the figure, the displacer cylinder 21
The gas in the cooling chamber 23 moves to the heating chamber 24 side via the gas passage 25 and is heated by the heater 27 on the heating chamber 24 side, causing high-temperature gas to accumulate in the heating chamber 24. Become.

In this case, since the volumes of the cooling chamber 23, the heating chamber 24, and the gas passage 25 are all constant, the pressure increases when there is a lot of high-temperature gas, and the pressure decreases when there is a lot of low-temperature gas. The change in gas pressure at this time is extracted as power via a power piston 29.

Generally, in order to increase the output of a Stirling engine, it is necessary to improve the sealing performance, increase the temperature difference, increase the efficiency of heat exchange, or reduce the sliding resistance during gas movement. However, in the case of a low-temperature-difference Stirling engine like the one listed above, improving the sealing performance and reducing the sliding resistance during gas movement increases the output. is a necessary condition.

However, in the Stirling engine configured as described above, the cooling chamber 23 and the heating chamber 2
Since no regenerator is provided in the gas passage 25 that communicates with the cooling chamber 2, the efficiency of heat exchange is poor, and the cooling chamber 2
It is not possible to make a large temperature difference between the heating chamber 3 and the heating chamber 24, and a large output cannot be obtained.

Furthermore, as a method for solving the above problems, as shown in FIG. 6, a regenerator 28 is provided in a gas passage 25 that communicates between the cooling chamber 23 and the heating chamber 24. However, in this case, the efficiency of heat exchange can be increased by providing the regenerator 28, so
Although it is possible to create a large temperature difference between the cooling chamber 23 and the heating chamber 24, the extra space required to provide the regenerator 28 increases the overall size, and the displacer piston 22 moves. This has resulted in a problem that the sliding resistance increases when the output is removed, resulting in a decrease in output.

[0010] The present invention solves the problems of the conventional ones as described above, and significantly reduces mechanical loss due to sliding resistance when moving gas between two chambers. It is an object of the present invention to provide a Stirling engine that can greatly increase the output by increasing the temperature difference between two chambers by increasing the efficiency of heat exchange between the chambers.

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a diaphragm inside the displacer cylinder to divide the interior into two chambers, and a space between the diaphragm and the displacer cylinder. A gas passage communicating between the two chambers is formed, a cooler is provided in one of the chambers, a heater is provided in the other chamber, and a regenerator is provided in the gas passage; A power cylinder having a movably provided power piston inside is connected to the chamber, and by displacement of the diaphragm,
The gas in the one chamber is moved into the other chamber via the regenerator in the gas passage, or the gas in the other chamber is moved into the one chamber via the regenerator in the gas passage; The displacer cylinder adopts a means for extracting the change in gas pressure as power via the power piston, and also includes a diaphragm in the displacer cylinder,
The interior is divided into two chambers, and a gas passage communicating between the two chambers is formed between the diaphragm and the displacer cylinder, and a cooler is installed in one of the chambers, and a heater is installed in the other chamber. A regenerator is provided in the gas passage, and a bellows is connected to the one chamber, and the displacement of the diaphragm causes the gas in the one chamber to flow through the regenerator in the gas passage. Means for moving the gas in the other chamber or the other chamber into one chamber via a regenerator in the gas passage, displacing the bellows by the change in gas pressure at this time, and extracting it as motive power. Further, the gas passage is provided at at least one location in the circumferential direction between the outer peripheral surface of the diaphragm and the inner peripheral surface of the displacer cylinder, and the gas passage A regenerator is provided at the diaphragm, and the gas passage extends over the entire circumference between the outer circumferential surface of the diaphragm and the inner circumferential surface of the displacer cylinder. In this embodiment, a regenerator having an annular shape is provided in the gas passage.

0012

[Operation] By adopting the above-mentioned means, this invention
The gas in one chamber in the displacer cylinder moves to the other chamber via the regenerator in the gas passage communicating between the two chambers by displacement of the diaphragm, and is heated by the heater in the other chamber. In addition, the gas in the other chamber moves to one chamber via the regenerator in the gas passage due to the displacement of the diaphragm, and is cooled by the cooler in one chamber, and the gas at this time This means that the change in pressure can be extracted as power through the power piston or bellows, and therefore the sliding resistance when moving the gas can be significantly reduced, and the regenerator in the gas path can exchange heat. This improves the efficiency during the process, allowing for a large temperature difference between the two chambers, and furthermore, when a bellows is used instead of a power piston, the internal sealing performance can be further improved. Therefore, the output can be significantly increased.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention shown in the drawings will be described below. FIG. 1 shows a first embodiment of a Stirling engine according to the present invention, which includes a displacer cylinder 1 and a diaphragm 2.
and a power piston 9.

The displacer cylinder 1 has a cylindrical shape, and its lower end opening is closed by a disc-shaped heater 7, and its upper end opening is closed by a disc-shaped cooler 6, so that there is a sealed cavity inside. A disk-shaped diaphragm 2 is provided in this cavity with its peripheral edge fixed to the inner circumferential surface of the displacer cylinder 1, and the diaphragm 2 separates the cooling chamber 3 and the heating chamber into the cavity. It is divided into two rooms (4).

There is a gap between the outer peripheral surface of the diaphragm 2 and the inner peripheral surface of the displacer cylinder 1 as shown in FIG.
As shown in b), a gas passage 5 communicating between the cooling chamber 3 and the heating chamber 4 in the circumferential direction is provided at at least one location (four locations in this embodiment), A regenerator 8 is provided in each passage 5.

In this case, as shown in FIGS. 3(a) and 3(b), the outer peripheral surface of the diaphragm 2 and the displacer cylinder 1
A gas passage 5 may be formed along the entire circumference between the inner peripheral surface of the gas passage 5 and a regenerator 8 formed in an annular shape may be provided within this gas passage 5.

A power cylinder 10 in which a power piston 9 is movably provided is connected to the cooler 6, and this power cylinder 10 passes through the cooler 6 and communicates with the inside of the cooling chamber 3. At the same time,
The power piston 9 is connected to a crankshaft 15 via a connecting rod 13, and a flywheel 16 is attached to the tip of the crankshaft 15.

A slide guide 12 that movably supports a slide shaft 11 connected to the diaphragm 2 is connected to the cooler 6, and the rear end of this slide shaft 11 is connected to the It is connected to the crankshaft 15. Note that the cooling chamber 3 and heating chamber 4 are sealed with gas.

Next, the effects of the above will be explained. First, when the diaphragm 2 is displaced upward in the figure, the gas in the cooling chamber 3 moves to the heating chamber 4 side via the regenerator 8 in the gas passage 5, and is heated by the heater 7 in the heating chamber 4. As a result, high-temperature gas accumulates in the heating chamber 4.

Further, when the diaphragm 2 is displaced downward in the figure, the gas in the heating chamber 4 moves to the cooling chamber 3 side via the regenerator 8 in the gas passage 5, and the cooler in the cooling chamber 3 6, the low temperature gas accumulates in the cooling chamber 3.

In this case, since a regenerator 8 is provided in the gas passage 5, when the gas moves from the cooling chamber 3 to the heating chamber 4 side, the gas is heated once in the regenerator 8 and then It moves into the heating chamber 4 and is heated by the heater 7, and
When the gas heated in the heating chamber 4 moves to the cooling chamber 3 side, the gas is once removed from heat by the regenerator 8 and then moves to the cooling chamber 3 where it is cooled by the cooler 6. Become.

That is, when gas moves from the heating chamber 4 to the cooling chamber 3, the temperature inside the regenerator 8 rises due to the temperature of the gas, and when the gas moves from the cooling chamber 3 to the heating chamber 4, the temperature inside the regenerator 8 increases. By moving through the regenerator 8 which is already hot, the amount of heating by the heater 7 can be reduced, and by passing through the regenerator 8 in this way,
The efficiency during heat exchange can be significantly increased, and therefore, the temperature difference between the cooling chamber 3 side and the heating chamber 4 side can be made significantly larger than in a conventional system without a regenerator.

By displacing the diaphragm 2 in this way, a gas passage 5 is created between the cooling chamber 3 and the heating chamber 4.
By moving the gas through the power piston 9, power corresponding to changes in gas pressure can be extracted through the power piston 9.

Further, in the above case, the gas is moved between the cooling chamber 3 and the heating chamber 4 by displacement of the diaphragm 2 whose peripheral edge is fixed to the inner circumferential surface of the displacer cylinder 1. As a result, there is no need to consider mechanical loss due to sliding resistance etc. when the displacer piston moves within the displacer cylinder 1, unlike in the past, and therefore, there is no reduction in output due to mechanical loss. .

As described above, in the Stirling engine according to this embodiment, the efficiency of heat exchange when moving gas between the cooling chamber 3 and the heating chamber 4 can be significantly increased. In addition to making it possible to increase the temperature difference between gases, it is possible to significantly reduce mechanical loss due to sliding resistance when moving gas, etc.
Therefore, the output can be significantly increased compared to the conventional one.

FIG. 4 shows a second embodiment of the Stirling engine according to the present invention, in which a telescopic bellows 18 is used in place of the power piston 9 for extracting power. , the rest of the structure is similar to that shown in the first embodiment, so the same parts as shown in the first embodiment are given the same numbers and the structure is A detailed explanation will be omitted.

[0027] Also in the Stirling engine shown in this embodiment, as in the first embodiment, the efficiency in heat exchange can be significantly increased, and the cooling chamber 3 and the heating chamber 4, and by moving the gas between the cooling chamber 3 and the heating chamber 4 by the displacement of the diaphragm 2, the gas can be moved. Mechanical losses due to sliding resistance etc. can be significantly reduced, and furthermore, by using the expandable bellows 18 when extracting power, the interior can be completely sealed. Therefore, the output can be further increased than that using the power piston 9.

[0028]

Effects of the Invention The present invention is configured as described above, and the gas is moved between one chamber and the other chamber by displacement of the diaphragm, so that when moving the gas between the two chambers, the gas can be moved between the two chambers. This makes it possible to significantly reduce the sliding resistance of , it is possible to increase the efficiency of heat exchange, and therefore it is possible to significantly increase the temperature difference between the two chambers.Furthermore, if a bellows is used when extracting power, the internal It has excellent effects such as being able to keep the air in a completely sealed state and therefore significantly increasing the output.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a first embodiment of a Stirling engine according to the present invention.

FIG. 2(a) is a plan view showing the regenerator of FIG. 1;
(b) is a sectional view of (a).

FIG. 3(a) is a plan view showing another embodiment of the regenerator, and FIG. 3(b) is a sectional view of FIG. 3(a).

FIG. 4 is a schematic sectional view showing a second embodiment of the Stirling engine according to the invention.

FIG. 5 is a schematic cross-sectional view showing an example of a conventional Stirling engine.

FIG. 6 is a schematic sectional view showing another example of a conventional Stirling engine.

[Explanation of symbols]

1, 21... Displacer cylinder 2... Diaphragm 3, 23... Cooling chamber 4, 24... Heating chamber 5, 25... Gas passage 6, 26... Cooler 7, 27... Heater 8, 28 ... Regenerators 9, 29 ... Power pistons 10, 30 ... Power cylinders 11, 31 ... Slide shafts 12, 32 ... Slide guides 13, 14, 33, 34 ... Connecting rods 15, 35 ...
Crankshaft 16, 36... Flywheel 18... Bellows 22... Displacer piston

Claims (4)

[Claims] Claim 1: A diaphragm (2) is provided within the displacer cylinder (1) to partition the interior into two chambers (3) and (4), and the displacer cylinder (1) is provided with a A gas passage (5) communicating between the two chambers (3) and (4) is formed, and a cooler (6) is provided in one of the chambers (3) and a heater (4) is provided in the other chamber (4). 7), a regenerator (8) is provided in the gas passage (5), and a power cylinder (10) is further provided with a movable power piston (9) inside the one chamber (3). ), and by displacement of the diaphragm (2), the gas in the one chamber (3) is transferred into the other chamber (4) via the regenerator (8) in the gas passage (5). , or the gas in the other chamber (4) is moved into the one chamber (3) via the regenerator (8) in the gas passage (5), and the change in gas pressure at this time is A Stirling engine characterized in that power is extracted as power via the power piston (9). 2. A diaphragm (2) is provided within the displacer cylinder (1) to partition the interior into two chambers (3) and (4), and the diaphragm (2) is provided between the diaphragm (2) and the displacer cylinder (1). A gas passage (5) communicating between the two chambers (3) and (4) is formed, and a cooler (6) is provided in one of the chambers (3) and a heater (4) is provided in the other chamber (4). 7), a regenerator (8) is provided in the gas passage (5), and a bellows (18) is connected to the one chamber (3), and by displacement of the diaphragm (2), The gas in the one chamber (3) is transferred to the other chamber (4) via the regenerator (8) in the gas passage (5), or the gas in the other chamber (4) is transferred to the other chamber (4). The gas is moved into one of the chambers (3) through the regenerator (8) in the gas passage (5), and the bellows (18) is displaced by the change in gas pressure at this time and extracted as power. Characteristic Stirling engine. 3. The gas passage (5) connects the outer peripheral surface of the diaphragm (2) and the displacer cylinder (
A regenerator (8) is provided in at least one place in the circumferential direction between the gas passage (5) and the inner peripheral surface of the
3. The Stirling engine according to claim 1, wherein the Stirling engine is provided with: ). 4. The gas passage (5) connects the outer peripheral surface of the diaphragm (2) and the displacer cylinder (
1), wherein a regenerator (8) is provided along the entire circumference between the regenerator (8) and the inner peripheral surface of the gas passageway (5), and is annularly formed within the gas passageway (5). Stirling engine described in 2.