JPS58178852A - Stirling engine - Google Patents

Abstract

PURPOSE:To provide a Stirling engine in which its work fluid is carried from a high- temperature chamber into through-holes formed at the central part of a plurality of pillar-like members disposed around the axis of a cylinder, from the tops of the pillar- like members into a clerance formed between a heater and the pillar-like members, and then from the root parts of the pillar-like members to a regenerator, and to increase the strength of the engine. CONSTITUTION:In a Stirling engine of this invention, a plurality of pillar-like members 5 are disposed around the axis of a cylinder in the manner of projecting from a high- temperature chamber head 3 toward a combustion chamber 11. The engine comprises further a heater 7 which envelops the pillar-like members 5 and the high-temperature chamber head 3 with a small clearance. Work fluid is carried from a high-temperature chamber 4 formed between a displacer 1 and the head 3 into through-holes 6 formed at the central part of each pillar-like member 5, from the tops of the pillar-like members 5 to a clearance 8 via the heater 7, and then from the root parts of the pillar-like members 5 to a regenerator 10. Further, radiation walls 12 are provided at the central part and around a plurality of projections of the heater 7 enveloping the plurality of pillar-like members 5. The regenerator 10 is disposed in the manner of surrounding a cylinder chamber, and the head 3 and the heater 7 is made of ceramics.

Description

DETAILED DESCRIPTION OF THE INVENTION The 19th invention relates to a Stirling engine, and in particular relates to the structure of a heater for a Stirling engine.

As is well known, the Stirling engine uses hydrogen inside the engine.
It is a closed-cycle prime mover that obtains work by sealing helium, air, etc. as a working fluid, heating it from the outside by tracing it along the wall, and converting the thermal energy into pressure energy of the working fluid. , exhaust, 19. of each starch fuel,
It has come into the spotlight due to problems such as the use of solar heat, and research and development is progressing in various countries.

Stirling engines can be roughly divided into two types: displacer type and tuple acting type. In both types, the working fluid heated by the heater is transferred to the cylinder head (high temperature chamber head) and the displacer (piston). ) or the tuple is guided into a high temperature chamber between the acting piston, moves down the piston, passes through the heating chamber, loses heat in the internal generator, cools down in the cooler, and then displacer and power. The heat is led to the heat storage chamber between the pistons and below the FJ Tuple Acting Piston, and the heat is recovered from the low addition chamber by the cooler and the regenerator.
It is heated in a heater and sent to the samurai Liu.

In a Stirling engine, the working fluid is heated from the outside through the wall, so it is no exaggeration to say that the fate of the Stirling engine is determined by the heat transfer needle, that is, the heat transfer of the heater. Conventionally, the use of a tubular heater consisting of many thin tubes has been proposed as a heater. Tubular heaters can have a large kJ transmission area, but the pressure loss of the working fluid is large, and the base is particularly susceptible to breakage due to vibrations.

Furthermore, since the use of one-sided heat materials such as ceramics is a waste of time and must be made of metal tubes, the heating temperature is limited.

Various types of systems have also been proposed in which the head of the high temperature chamber is used as a heater or a part of the heater. This method generally has the disadvantage of requiring a large heat transfer area. The present inventors have previously invented and filed a patent application for a convex heater in which the high-temperature chamber head of a heating device is curved to protrude, and a concave heater in which the head is curved and recessed. Although this heater has many excellent features and has a larger heat transfer area than conventional heaters, the heat transfer area is also limited and it is not possible to obtain the same sufficient amount of heat transfer.

The purpose of the present invention is to ensure that the heat transfer coefficient is small, the pressure loss of the passing working fluid is small, and sufficient force can be ensured.
An object of the present invention is to provide a Stirling gas station equipped with an improved heater of a type in which a tube head is used as a heater.

In the Stirling engine by Akira Akira, several columnar bodies protrude from the high-temperature chamber head toward the combustion chamber, surrounding the cylinder axis, and the straight rod-shaped body and the Takabuchi head are slightly separated. Equipped with a heater that encases the
fi, that the body is delivered from the high temperature chamber through the through hole in the center of the columnar body, from the tip of the columnar body through the gap with the heater, and from the columnar body strength section to the endogenous organ. It is a characteristic Starling engine.

Preferred embodiments of the Stirling engine according to the invention include the following embodiments (a) to (,).

(a) A radiant wall is provided around and at the center of the plurality of protrusions of the heater that encloses the first P columnar bodies.

(b) The restraint chamber is provided as a cylinder chamber, extends to the gap between the head and the heating chamber, and is directly connected to the working fluid passage.

(C) The number of the columnar bodies is 3 to 8.

(d) The high temperature chamber head is curved and protrudes or is recessed.

(e) The high temperature chamber head and heating chamber are made of ceramics.

Hereinafter, the Stirling engine according to the present invention will be explained in detail based on drawings of embodiments. FIG. 1 is a longitudinal sectional view of a portion (the upper part of the cylinder and the combustion chamber) of an embodiment of the Stirling engine of the present invention.

In FIG. 1, 1 is a displacer, and the upper part of this cylinder chamber is formed by a cylinder liner 2 and a high temperature chamber head 3. This high temperature chamber head 3 is straightened/bent and protrudes. A high temperature chamber is located between the displacer 1 and the high temperature chamber head 3.

Projecting from the high temperature chamber 3 toward the combustion chamber 11 are four cylindrical bodies 5 (see FIG. 2) surrounding the cylinder axis. A through hole 6 is bored in the center of the cylindrical body 5, and both ends of the through hole 6 open at the center of the high temperature chamber 4 and the tip of the cylindrical body 5. Five cylindrical bodies (1) are provided at equal intervals on the same circular arc centered on the cylinder axis, preferably 3 to 8 cylindrical bodies.

A heater 7 is provided with a slight gap 8 between the cylindrical body 5 and the high temperature chamber head 3. Therefore, four protrusions corresponding to the positions and number of the seven cylindrical bodies 5 of the heater are broken.

The heater 7 is bolted to the engine frame 9. Heater 7
is shown in FIGS. 3 and 4 in plan view and 11111 view. Heater 7 and? h. The greenhouse head 3 (including the cylindrical body 5) can be designed and manufactured using ceramics with a strong structure that can sufficiently withstand stress caused by external forces such as thermal stress and vibration.

In this Stirling engine, a regenerator 10 is provided surrounding the cylinder chamber and extends to a gap 8 between the high temperature chamber head 3 and the heater 7. 11 is a combustion chamber in which high-temperature combustion gas is generated by a fuel combustion device (not shown);
The combustion gas moves in the direction of the white arrow. A radiant wall 12 is provided around the arrowhead of the heater 7 and between the medium heat.

The radiant wall 12 around the arrowhead of the heater 7 forms the inner wall of the combustion chamber 11, and the outer skin 13 is filled with a heat insulating phase 14, and the outer skin 13 is fixed to the frame 9 with bolts. has been done. For the radiation wall 12, suitable materials include ceramics, bamboo and high-temperature scum, and zirconia thread ceramics.

The working fluid inlet in the high temperature chamber 4 passes through the through hole 6 to the tip of the columnar body 5, as shown by the single arrow in Figure 1, and from there passes through the gap 81 to the base r of the columnar body 5. In the embodiment shown in Fig. 1, the direct regenerator 1oi+<[: is inserted.In the double-acting 8z section, the regenerator is guided to the adjacent regenerator, and the regenerator is provided separately from the main body. Of course, if the heat receiving part of the heater is small in diameter, the inner pressure can be kept at very daytime pressure, but the wall is relatively thin. Since the large-diameter base is insulated to eliminate thermal stress, it can be placed at the innermost part, so it is possible to construct a structure that can be subjected to high pressure.

In addition, this Stirling engine is provided with a radiant wall 12, so that the heater 7 receives heat from the combustion gas through dregs radiation and convection heat transfer, and the radiant wall absorbs heat from the combusted dregs]2 Heated by solid-state radiation.

In FIG. 2, radiation lines are indicated by arrows 1-. @Opposite wall 1
By increasing the flow velocity of the combustion gas by reducing the distance between the protrusions of the heater 7 and the heater 7, a large number of protrusions are provided on the radiation wall or the surface of the heater protrusions to reduce turbulent flow. By promoting heat transfer and increasing the heat transfer area, it is possible to promote convective heat transfer from the combustion scum to the radiant wall and heater protrusion, and to improve overall heat transfer from the combustion scum to the heater. . Furthermore,
Since the columnar body 5 acts as a radiator and the working waste passes through the narrow gap 8 between the heater and the columnar body, the heat transfer from the heater to the working gas is also good.

Stirling engine heater and heating by unexploded Lee-1 (
Anana structure - It is structured as above. Therefore, sufficient heat transfer area can be taken, heat transfer is large due to solid radiation, heaters with sufficient strength can be designed, pressure loss of passing working fluid is small, and ceramics are used. It has many excellent features such as being able to read, and can be used as a highly efficient Stirling book for old men.

[Brief explanation of the drawing]

A partial longitudinal cross-sectional view of the embodiment of the Sterling seal of ``Button 1 Figure 1 This I4)'', Figure 12 is shown in Figure 1.
i li: Ii side view, Figure 3 and Figure 4 υ, a plan view of the heater in Figure 1, and Figure 1111. 1... taste laser, 2... cylinder liner, 3
...High temperature chamber head, 4...High temperature chamber, 5...Column body, 6...Oil hole, 7...Heater, 8...Gap, 9
...Frame f110...Regenerator, 11...Combustion chamber,
]2...Radiation wall, ]3...Outer skin, ]4...Insulating material. 1 drawing of grass / \ / / : 8 [no ″ , ・], ”′, 5 □Go trivial convexity ・ 6 le ・ / 2 , , ′ , 71
- A・・Al1, Stomach 1,4.゛・, '4 1 ... 4 I 〆へ＼ 10 ) 5 Do figure

Claims (6)

[Claims] (1) A heater is provided in which a plurality of columnar bodies surrounding the cylinder axis center protrude from the high temperature chamber head toward the combustion chamber, and the columnar bodies and the high temperature chamber head are enclosed at a small distance. However, the working fluid passes from the high temperature chamber through the through hole in the center of the columnar body, passes through the gap in the heater from the tip of the columnar body, and is sent from the base part of the columnar body to the horn generator. The Starling Engine is 14-years-old and has 14 degrees to go. (2) A plurality of heaters enclosing the plurality of columnar bodies.
The Stirling engine according to claim 31, wherein a radiant wall is provided at the periphery and central portion of the t protrusions. (3) the horn generator is provided surrounding the cylinder chamber, and extends in a gap between the high temperature chamber head and the heater;
Claim p that extends directly into the working fluid passage.
! ; 1st or 2nd term sterling 1 table. (4) The Stirling cash register according to claim 1, 2 or 3, wherein the number of columnar bodies is 3 to 8. (5) The Stirling engine according to claim 1, 2, 3, or 4, wherein the high temperature chamber head is curved and protrudes or recesses. (6) The Stirling engine according to claim 1, 2, 3, 4, or 5, wherein the high temperature chamber head and the heating chamber are made of ceramics.