JPH03164558A - Stirling engine - Google Patents

Abstract

PURPOSE:To improve operating responsiveness by providing a cylinder head part additionally with a curved-face wall, and burying numerous rod-like metal needles into this curved-face wall in such a way as to be protruded on both faces, thereby heating operating gas in a cylinder utilizing solar heat. CONSTITUTION:A displacer piston 10 and a power piston 11 are disposed vertically tandem and the inside of a cylinder 14 is vertically interlocked by a L-type crank 12, thus forming the movable part of an engine. In this case, the upper surface of a cylinder head 13 is additionally provided with recessed curved-face wall 17 made of heat-resistant material, and numerous rod-like metal needles 18 are buried into the curved-face wall 17 in such a way as to be protruded on both faces. The inside 19 of the cylinder 14 is heated utilizing solar heat B converging on the outside of the curved-face wall 17. Operating gas in the cylinder 14 is thereby heated with the solar heat B in addition to being heated by a heater 16, thus improving heating and heat transmitting action and therefore improving operating responsiveness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a Stirling engine whose cylinder head is heated.

[Conventional technology]

The Stirling engine, which is an external combustion engine, generally has an expansion chamber and a compression chamber communicated through a heater, a heat storage device, and a tarp, and the heater is placed inside the combustion chamber, and the combustion energy of the air-fuel mixture in the combustion chamber is The structure is such that heat is transferred to the working gas via a heater. When attempting to heat the working gas using solar heat in a Stirling engine having such a configuration, the configuration shown in FIG. 4, for example, is adopted.

(2) is a power piston, and both are moved up and down in a cylinder (2) with a head (to) by an L-shaped crank (a). This constitutes the moving parts of the Stirling engine. (a) is a regenerative heat exchanger and (4)
is a tarp. The cylinder head (2) has a rigid wall made of cast iron, which is the same material as the cylinder (2).

In the illustrated example, when the displacer piston (A) moves up and down, the working gas (2) that was filled in one chamber (B) of the cylinder (2) is transferred to the heat storage device (A).

It flows through the cooler (a) to the other chamber. In addition, the working gas flows in the opposite direction, but the working gas (4) is heated as it passes through the heater (a), and due to this heating, the entire engine operates according to the same operating principle as a conventional Stirling engine. , produces output from the crankshaft. Its rotation direction is the direction of arrow A, and its operating principle is well known and will therefore be omitted here.

[Problem to be solved by the invention]

When a conventional Stirling engine is heated by solar heat, as shown in the conventional example in Figure 4, the rigid walls of the cylinder head (2) and the rigid walls of the heating tube (a) are heated by sunlight B, etc. It was usual to heat the cylinder directly from the wall and heat the working gas in the cylinder through the wall. This resulted in insufficient heat transfer and slow response.

[Means to solve the problem]

In order to solve the above conventional problems, the present invention provides a concave or convex curved wall in the upper part of the cylinder head, and implants a large number of rod-shaped metal needles into the curved wall so as to protrude from both sides.
It is made by transmitting heat into the cylinder by passing sunlight through a metal needle and a curved wall.

〔Example〕

FIG. 1 is a sectional view of an embodiment of the Stirling engine of the present invention. αω is a displacer piston arranged vertically in a skewer shape, and αυ is a power piston,
Both are moved up and down in the cylinder α by an L-shaped crank (A), forming the moving parts of the Stirling engine. αω is a regenerative heat exchanger and αω is a cooler.

In the Stirling engine of the present invention, a concave curved wall made of a heat-resistant material such as stainless steel is provided on the upper surface of the radial alpha bar to the cylinder, and rod-shaped metal needles made of the same material are protruded from both sides of the curved wall surface. The structure is such that the solar heat B concentrated on the outside of the curved wall αη passes through the metal needle α barrel and the curved wall αη itself, and heats the inside of the cylinder.

The operation of the Stirling engine of the present invention is based on the same operating principle as the conventional Stirling engine due to the heating described above, and the engine cranks! An output is generated by th (support), and its rotation direction is in the direction of arrow A.

The Stirling engine according to the present invention has an extremely large heat transfer area inside and outside, and also has good radiation absorption.
It can be seen that not only is it suitable for solar heat utilization, but also the combustion radiant heat of any fuel can be fully utilized.

Further, in this embodiment, the curved wall has a concave shape, but it can also have a convex shape.

Also, the metal needle (to) is shown in Figure 2 (A) (B) and Figure 3 (A).
It is preferable to use grooves, screws, etc. to increase the surface area, as shown in (1).

In the above embodiment, the engine is a single cylinder, but
Of course, it can also be used with multiple cylinders, and can also be used in reverse Stirling cycle refrigerators.

〔Effect of the invention〕

As described above, since the Stirling engine according to the present invention has good heat transfer through the acicular heat transfer surface, it is not only lighter and simpler than the conventional rigid wall Stirling engine, but also has extremely improved response. In addition, the features of the Stirling engine, such as quietness, high efficiency, and a variety of fuel types, can be utilized as they are.

Note that the system according to the present invention is an invention that has excellent effects such as being applicable to other types of Stirling engines that do not have a displacer piston.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a Stirling engine showing an embodiment of the present invention, FIG. 2 (A), FIG. 3 (A), and FIG.
B) and FIG. 3B are a side view and a front view showing other embodiments of the metal needle used in the present invention, respectively, and FIG. 4 is a sectional view showing a conventional example. α moan, (a) --- Displacer piston α
υ, (2)...Power piston (2), (2)
・・・・L type crank (support), m---・・Crankshaft α protrusion (2)・・・・・Cylinder hemlock 16 sets (2)・
...Cylinder α mouth, @ ... Regenerative heat exchanger (Ll!, Kanji ... Cooler (to) ...... Metal needle α Power·····
・Curved wall/ (a)... Heater diagram (a) diagram (b) /8 diagram diagram

Claims (1)

[Claims] In a Stirling engine that supplies working gas to a working chamber in a cylinder via a cooler, a heat accumulator, and a heater to reciprocate a displacer piston and extract mechanical output, the heater is provided in the cylinder head and a large number of A Stirling engine characterized in that it is formed of a concave or convex curved wall formed by implanting rod-shaped metal needles so as to protrude from both sides.