JPS6363737B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air preheater for a Stirling engine.

The Stirling engine, an external combustion engine, is the first
As shown in the figure, a circular air preheater 2 is provided along the inner periphery of the combustion chamber 1. The conventional air preheater 2' is
As shown in FIG. 2, panels are arranged on the upper and lower sides and the inner and outer circumferences of the corrugated element 3, and combustion gas intake and outlet ports 7 and 8 are formed between the inner circumferential panel 4 and the upper and lower panels 5 and 6, and , the outer peripheral panel 9 is configured to form air intake and air outlet ports 10 and 11 between the upper and lower panels 5 and 6. The combustion gas is indicated by arrow A.
As shown in FIG.
Furthermore, the combustion air is discharged as shown by arrow B.
An air intake port 10 is provided in the outer circumferential passage of the corrugated element 3.
The air then enters the combustion chamber through the air intake port 11. The heat of the combustion gases is transferred to the combustion air via the corrugated elements 3, preheating the air. In this conventional structure, the gas and air inlet and outlet ports are opened at arbitrary widths over the entire circumference of the corrugated element, and the length during heat exchange corresponds to the height of the corrugated element. The flow path for heat exchange is small and the preheating effect is low.

Therefore, this invention attempts to eliminate the above-mentioned problems by enlarging the flow path for heat exchange.Basically, combustion air and combustion gas are placed at the top and bottom of the corrugated element. connections are provided and technical means are used to move the combustion gases and combustion air from one passage to the next and to remove the gases and air after sufficient heat exchange has taken place.

According to this invention, the intake and outlet ports for combustion gas and air are arranged at equal intervals around the corrugated element, so that the gas and air are evenly distributed to each intake port, and the intake and outlet ports for combustion gas and air are equally distributed around the corrugated element. The heat exchange is almost the same,
Combustion air that is insufficiently preheated is not supplied to the combustion chamber.

Embodiments of the invention will be described with reference to the accompanying drawings.

Please refer to FIGS. 3-6. The air preheater 2 has an annular corrugated element 12 .
Upper and lower panels 13, 14 and inner and outer peripheral panels 1
It has a main body to which parts 5 and 16 are fixed.

An air intake port 17 is provided at the bottom of the outer peripheral panel 16 and communicates with the outward passage of the corrugated element 12. The air intake port 17 is connected to the first air passage 18
supply combustion air to the An upper communication passage 19 is provided at the upper part of the outer peripheral panel 16. The upper communication passage serves to transfer the air in the first passage 18 to the adjacent second air passage 20. Upper connecting passage 1
The combustion air that has entered the second air passage through the third air passage 9 descends and is supplied to an adjacent third air passage 22 through an upper communication passage 21 provided at the lower part of the outer peripheral panel 16. The combustion air that has entered the third air passage 22 rises, is discharged from an air outlet 23 provided at the top, and is supplied to the combustion chamber 23. The upper and lower communication passages 19 and 21 may be box-shaped and communicate with each passage. 3-6 show a portion of the preheater, the elements shown and described being arranged in a sequential annular manner.

A combustion gas intake port 24 is provided by opening the upper part of the inner peripheral panel 15, and the combustion gas is introduced into the first combustion gas passage 2.
Supply to 5. The combustion gas that has entered the first combustion gas passage 25 enters the adjacent second combustion gas passage 27 via the lower gas communication passage 26 at the lower part of the inner peripheral panel 15 and rises. An upper gas communication passage 28 is provided on the upper inner peripheral side of the second gas passage 27, and the combustion gas in the second gas passage 27 passes through the upper gas communication passage 28 and is transferred to the third gas passage 29. to go into. The combustion gas that has entered the third gas passage descends and is discharged from the gas outlet 30.

The aforementioned flow of combustion gas is caused by the corrugated element 1
2, which faces the flow of combustion air,
Heat transfer from the combustion gases to the combustion air takes place. The structures shown in FIGS. 3 to 6 are sequentially arranged in a ring.

Although the illustrated example uses two channels of corrugated elements to provide gas and air channels, the invention is not limited to this example.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the combustion chamber of a Stirling engine, FIG. 2 is a partial perspective view of a conventional air preheater, and FIG. 3 is a partial perspective view of an example of the air preheater of the present invention as seen from inside. FIG. 4 is a cross-sectional view showing the lower passage, and FIG. 5 is a cross-sectional view showing the upper passage.
FIG. 6 is a sectional view taken in the direction of the arrow in FIG. 3. In the figure: 2...Air preheater, 12...Wave element, 17...Air intake, 18, 20, 22...
...Air passage, 19, 21...Air communication passage, 23
...Air intake port, 24...Gas intake port, 25,2
7, 29... Gas passage, 26, 28... Gas communication passage, 30... Gas outlet.

Claims (1)

[Claims] 1 A main body having an annular wave-shaped element along the inner periphery of the combustion chamber, an air intake opening on the outer periphery side of the main body and supplying combustion air to a first air passage, and an upper part of the air intake. an upper communication passage that is provided in and sends combustion air from the first air passage to a second air passage; a lower communication passage that sends air from the second air passage to the third air passage; an air intake port that communicates with the third air passage and opens on the outer circumference side of the main body; a combustion gas intake port that opens on the inner circumference side of the main body and supplies combustion gas to the first combustion gas passage; a lower gas communication passage that is provided below the combustion gas intake port and sends combustion gas from the first combustion gas passage to a second combustion gas passage; and a third combustion gas passage from the second combustion gas passage. An air preheater for a Stirling engine, comprising an upper gas communication passage for sending combustion gas to the third combustion gas passage, and a combustion gas outlet that communicates with the third combustion gas passage and opens on the inner peripheral side of the main body.