JPH0639943B2 - Heater head for hot gas engine - Google Patents

Description

Description: (a) Field of Industrial Application The present invention relates to improvement of a heater head of a multi-cylinder hot gas engine (for example, Stirling engine) used for power generation, power, refrigeration, and the like.

(B) Conventional technology In a conventional multi-cylinder hot gas engine, a plurality of corresponding cylinders and a plurality of heat exchangers are connected by a large number of heater pipes, and combustion gas is passed between the heater pipes for heating. Has a heater head which corresponds to each cylinder, and a plurality of heater heads corresponding to the respective cylinders are disclosed in Japanese Patent Publication No. 55-20060.
As shown in the publication and FIG. 5, a plurality of heater pipes, which are arranged in a ring shape around the center line of the engine and connect each cylinder and each heat exchanger, are substantially conical in shape. By forming an involute curve that forms a surface, the length of each heater pipe becomes large and the intervals between the heater pipes become small and uniform, so that it is widely and generally used.

(C) Problems to be Solved by the Invention However, in the conventional hot gas engine as shown in FIG. 5, each cylinder 1 and each corresponding heat exchanger 2 are connected by a large number of heater pipes 6. For each of the manifolds 4 and 5 of each cylinder 1 and each heat exchanger 2,
The heater pipe 6 formed into an involute curve whose curved portion substantially forms a conical surface is assembled, but each manifold has walls at both ends, and one end portion is formed due to the wall thickness. The space between the heater pipe assembled to and the heater pipe adjacent to it is larger than the space between other heater pipes, and the combustion gas selectively flows out from that part at a low passage speed, reducing the heat transfer efficiency. There is a problem that the overall heat exchange efficiency is reduced.

(D) Means for Solving the Problems The heater head for a hot gas engine according to the present invention connects a plurality of corresponding cylinders and a plurality of heat exchangers of a multi-cylinder hot gas engine with a large number of heater pipes, In the heater head that heats by passing the combustion gas between the heater pipes, the shape of the curved portion of each heater pipe is formed into an involute curve that forms a substantially conical surface, and they are formed into multiple cylinders and multiple heat sources. When assembling a plurality of manifolds respectively corresponding to the exchangers, one of a large number of heater pipes connecting the corresponding cylinders and heat exchangers is arranged so as to make the intervals of all the heater pipes substantially equal. The assembly position of one heater pipe at the end is made different from the assembly position of the other heater pipes, and the assembly end portions are adjacent to each other. And shaped to conform to the shape of the Tapaipu.

(E) Action By making the intervals of all the heater pipes substantially equal, the velocity of the combustion gas for heating passing between the heater pipes can be made uniform and high.

(F) Embodiment Next, as a heater head according to an embodiment of the present invention, in a four-cylinder engine in which each cylinder is arranged inside and each heat exchanger is arranged outside, referring to FIG. 1 to FIG. Explain.

As an example, a heater head for a hot gas engine (Stirling engine) shown in FIG. 4 will be described as a whole. 1 to 3, an inner manifold 4 provided on the upper part of the cylinder 1 and an outer manifold 5 provided on the upper part of the heat exchanger 2 are connected by a large number of heater pipes 6 to form a heater head 3. Has been formed.

As shown in FIG. 3, the heater pipe 6 has a curved portion that extends in a conical shape and a linear portion that extends in a cylindrical shape. In FIGS. 1 and 2, each heater pipe 6 is located between the manifolds 4 and 5 inside and outside. In a plan view showing a state in which the working gas extends, the working gas flows in these heater pipes 6 by the movement of the piston in the cylinder 1 and reciprocates. On the other hand, the combustion gas burned in the combustion chamber 12 by the combustion air from the burner 10 and the intake port 11 passes through the gap between the heater pipes in the direction of the solid arrow in FIG. 4 and is discharged from the exhaust port 13. However, during this time, heat exchange is performed and the working gas is heated. The dashed arrow indicates the flow direction of the combustion air.

FIG. 1 shows the overall structure of the heater head according to the present invention. The inner manifolds 4 provided in each of the four cylinders 1 arranged inside close to the engine center line and the corresponding four A plurality of heater pipes 6 each having an involute curve whose curved portion forms a substantially conical surface are connected to the outer manifold 5 provided in each heat exchanger 2, and each heater head 3 is connected. Are formed.

The heater head according to the present invention is shown in detail in FIGS. 1 and 2 and includes a large number of heater pipes 6.
When assembling to the inner manifold 4 located inside, the inner cross-section of the inner manifold 4 is made, for example, rectangular to widen the width, and the assembly position of only one end heater pipe 6E to be assembled at one of the outermost ends. Inward toward the center line of the engine, and at the end heater pipe 6
By molding the assembling end portion of E so as to fit the shape of the adjacent heater pipe, the distance between the end heater pipe 6E and the heater pipe 6 at the adjacent end is set between other general heater pipes. Can be made substantially equal to the distance between the heater pipes, and the distance between all the heater pipes can be substantially uniform.

The heater pipe 6 is attached to the outer manifold 5 so that the length of the outer manifold 5 is equal to the inner manifold 4.
Since the length of each heater pipe is longer than that of the heater pipe, the interval between the heater pipes becomes large, and the special treatment as described above is not required. Usually, fins 7 are provided on the outer circumference of each heater pipe 6 to improve the heat transfer efficiency.

(G) Effect of the Invention As described above, the heater pipe assembled at the end of the inner manifold of each heater head and the adjacent heater pipe are separated from each other by substantially the same distance between the heater pipes other than the end. By making the distance between all the heater pipes substantially equal, and therefore, the combustion gas passing between the heater pipes is sufficiently and evenly throttled,
Since the flow velocity when passing through the heater pipe can be increased and a large amount of heat can be transferred, the heat exchange efficiency of the entire heater head can be improved.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a heater head according to the present invention, FIG. 2 is a partial detailed view of FIG. 1, FIG. 3 is a sectional view taken along the line CC ′ of FIG. 2, and FIG. FIG. 5 is a schematic side sectional view of a heater head for an engine, and FIG. 5 is a front view of a conventional heater head. 1 ... Cylinder 2 ... Heat exchanger 3 ... Heater head 4 ... Inner manifold 5 ... Outer manifold 6 ... Heater pipe 6E ... End heater pipe 7 ... Fin 10 ... Burner 11 ... Intake port 12 ... Combustion chamber 13 ... Exhaust port

Claims (1)

[Claims] 1. A heater head in which a plurality of corresponding cylinders of a multi-cylinder hot gas engine and a plurality of heat exchangers are connected by a large number of heater pipes, and a combustion gas is passed between the heater pipes for heating. , The shape of the curved portion of each heater pipe is formed into an involute curve that forms a substantially conical surface, and when all of them are assembled into a plurality of manifolds corresponding to a plurality of cylinders and a plurality of heat exchangers, all Of the many heater pipes connecting the corresponding cylinders and heat exchangers so that the intervals of the heater pipes are substantially even, one of the end portions of one end
A heater for a hot gas engine, characterized in that the assembly position of the heater pipe of the book is made different from the assembly position of other heater pipes, and the assembly end portion is molded so as to match the shape of the adjacent heater pipe. head.