JPH07310591A - Heater for starting engine - Google Patents

Abstract

PURPOSE:To provide a heater, in which working gas is heated by means of a light receiving fin whose temperature is increased by receiving sunlight, light from an infrared ray lamp, or the like, for a Stirling engine. CONSTITUTION:A copper light receiving fin 74 provided with multiple corrugated plates 76 is inserted into the inside of a heating chamber 73. A transparent glass plate 78 and a lid 79 are fitted in a flange part 71 via heat resistant seals 76a, 76b while mounting bolts 80 are screwed, so that a heater 7 is installed in a Stirling engine. A concave mirror 82 is arranged in the bottom of the heating chamber 73. The temperature of the light receiving fin 74 is increased by the light which passes through the transparent glass plate 78 and reaches the heating chamber 73. The light reflected by the concave mirror 82 is received by the light receiving fin 74.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Stirling engine heater for heating and expanding a working gas of a Stirling engine.

[0002]

2. Description of the Related Art Conventionally, a Stirling engine has been provided. The Stirling engine operates a piston by a pressure difference between a high pressure due to heating of the working gas and a low pressure due to cooling of the working gas. In such Stirling institutions,
A heater for heating the working gas is used. The prior art will be described by taking a liquid Stirling engine as an example.
The liquid type Stirling engine, as shown in FIG.
A first cylinder 100 having 01, a heater 109 of an electric heater type, and a second cylinder 200 having a second liquid chamber 201.
An output cylinder 300, a path 400 that connects the high-temperature space 102 and the low-temperature space 202 to each other, a heat storage device 500 arranged in the path 400, and a radiation fin 209 arranged around the low-temperature space 202. ing. High temperature space 10
2. A working gas is sealed in the low temperature space 202 and the path 400. The first liquid chamber 101 and the second liquid chamber 201 communicate with each other via a liquid communication passage 105. The liquid in the first liquid chamber 101 is the first liquid piston 107, and the liquid in the second liquid chamber 201 is the second liquid piston 207.

In this case, an electric heater type heater 10 is used.
As the working gas in the high temperature space 102 is heated by
The liquid piston 107 and the second liquid piston 207 repeatedly rise and fall with a phase difference, and accordingly, the liquid surface of the liquid in the output cylinder 300 repeatedly lowers and rises. The movement of the liquid surface of the output cylinder 300 is taken out as an output.

[0004]

The Stirling engine described above uses an electric heater type heater for heating the working gas. Therefore, it is not easy to install it outdoors where there are restrictions on the power supply surface. The present invention has been made in view of the above circumstances, and a common object of each claim is to make a fin that comes into contact with a working gas of a Stirling engine receive light such as sunlight or an infrared lamp to raise the temperature of the fin. Therefore, it is possible to eliminate the electric heater, or to provide a heater for a Stirling engine that is small in size even if the electric heater is used.

An object of a second aspect of the present invention is to provide a heater for a Stirling engine in which the utilization efficiency of light is enhanced by utilizing a reflecting mirror. The problem of claim 3 is
It is an object of the present invention to provide a Stirling engine heater that further improves the light utilization efficiency by using a concave mirror having a function of focusing light.

An object of a fourth aspect of the present invention is to provide a Stirling engine heater in which a corrugated plate is used as a light receiving fin to enhance the light utilization efficiency. A fifth aspect of the present invention is to arrange the corrugated plate forming the light receiving fins substantially perpendicular to the transparent plate so that a large number of light receiving fins can be accommodated in the heating chamber, and a light receiving area can be secured to improve light utilization efficiency. It is to provide a heater for a Stirling engine that is designed to be enhanced.

A sixth object of the present invention is to provide a heater for a Stirling engine, which enhances the holding property of a large number of corrugated plates.

[0008]

A Stirling engine heater according to a first aspect of the present invention is arranged in a path through which a working gas of a Stirling engine passes to heat and expand the working gas. A base having a heating chamber for transmitting light, a light-transmitting portion provided on the base for transmitting light to the heating chamber, and a light-transmitting portion arranged in the heating chamber of the substrate for receiving light reaching the heating chamber through the light-transmitting portion. And a light receiving fin that is heated by the energy of light.

As the material of the substrate, stainless steel or glass can be adopted. The translucent part is a transparent plate (clear glass,
It is preferable to use a transparent resin or the like). The structure of the light-receiving fins can be set as appropriate and may be a corrugated plate shape or a protrusion shape. The material of the light receiving fin can be adopted considering thermal conductivity, corrosion resistance, etc.,
Copper, aluminum, steel, etc. can be used. A Stirling engine heater according to a second aspect is the heater according to the first aspect, wherein a reflecting mirror that reflects light toward the light-receiving fins is arranged in the heating chamber of the base body so as to face the light transmitting portion. It is what The reflecting mirror may be formed of a metal such as aluminum or copper, or in some cases, a resin may be vapor-deposited with a metal to form a reflecting surface.

A Stirling engine heater according to a third aspect of the present invention is the heater according to the second aspect, wherein the reflecting mirror is a concave mirror that reflects the light reaching the heating chamber through the light transmitting portion to the light receiving fins. To do. The concave mirror has a function of focusing light. The degree of light focusing by the concave mirror can be appropriately selected. A Stirling engine heater according to a fourth aspect is the heater according to the first aspect, wherein the light-receiving fin is configured by arranging at least two metal corrugated plates having continuous corrugations. Is. The number of corrugated plates can be appropriately selected, and can be 3, 5, 7, 9 or more. As the corrugated shape of the corrugated plate, a square wave, a triangular wave, a square wave, a round wave, or the like can be appropriately adopted.

A Stirling engine heater according to a fifth aspect of the present invention is the heater according to the fourth aspect, wherein the light transmitting portion is formed of a transparent plate that closes the opening of the base body in a hermetically closed state, and the waves of the corrugated plate forming the light receiving fins are continuous. The direction of movement is substantially perpendicular to the transparent board. The transparent plate can be made of transparent glass, transparent resin, or the like. A Stirling engine heater according to a sixth aspect is the heater according to the first aspect, wherein the light-receiving fin includes a ring-shaped holding frame fixed to the base body and a large number of corrugated plates held by the holding frame. It is characterized by that.

[0012]

In the first to sixth aspects, light such as sunlight and infrared rays passes through the light transmitting portion. The light passing through the light transmitting portion is received by the light receiving fin, and the light receiving fin is heated by the energy of the light. The working gas of the Stirling engine receives heat from the light receiving fins and is heated. As described above, in the first aspect, since the method of directly heating the light receiving fins by the light energy is employed, the working gas can be heated without relying on the electric heater, and the electric heater conventionally used can be abolished. Alternatively, even if an electric heater is used, the light receiving fin is heated by the energy of light, so that the size is small.

As described above, in the first to sixth aspects, since the electric heater can be eliminated or downsized, it is suitable for use in a Stirling engine installed outdoors where the power feeding surface is restricted. Of course, it can be applied to a Stirling engine installed indoors as long as the light receiving fin can receive light such as sunlight or an infrared lamp. In the second aspect, since the reflecting mirror that reflects the light toward the light receiving fin is provided, the light reflected by the reflecting mirror can reach the light receiving fin. As a result, the light receiving rate of the light receiving fins is improved, the temperature of the light receiving fins can be efficiently raised, and it is advantageous for heating the working gas.

In the third aspect, since the reflecting mirror is a concave mirror having a function of focusing light, light scattering is suppressed. As a result, the light receiving rate by the light receiving fins is further improved, and the temperature of the light receiving fins can be raised more efficiently. Therefore, it is advantageous to heat the working gas. According to the fourth aspect, since the corrugated plates are arranged side by side to form the light receiving fin, the surface area of the light receiving fin is increased. Therefore, the light receiving area of the light receiving fin is increased, and the temperature of the light receiving fin can be efficiently raised. Further, since the contact area between the light receiving fins and the working gas is secured, it is advantageous to efficiently heat the working gas of the Stirling engine.

According to the present invention, since the light-transmitting part is constituted by the transparent board for closing the opening of the base body in a hermetically closed state, rainwater is prevented from entering the heating chamber even if the heater is installed outdoors. To be Of course, leakage of the working gas from the heating chamber of the substrate can be suppressed. Further, according to claim 5, since the continuous wave direction of each corrugated plate forming the light receiving fin is substantially perpendicular to the transparent plate, it is possible to dispose a large number of corrugated plates in the heating chamber. It is advantageous to secure the surface area of the plate.
Therefore, it is advantageous to increase the light receiving area by the light receiving fins, and it is advantageous to secure the contact area between the light receiving fins and the working gas, and to efficiently heat the working gas.

According to the sixth aspect of the present invention, since the holding frame holding the corrugated plate is fixed to the base body, the corrugated plate retainability is improved even if there are a large number of corrugated plates forming the light receiving fins.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a liquid Stirling engine will be described with reference to FIGS. This liquid Stirling engine includes a vertical first cylinder 1 and a second cylinder 2, a vertical output cylinder 3, a path 4,
The heat storage device 5 is provided.

The first cylinder 1 has a high temperature in which a liquid is stored in a first liquid chamber 11 and a working gas (pressure is 1 atm at room temperature when not in use) is filled above the liquid surface of the first liquid chamber 11. The space 12 is provided. The liquid in the first liquid chamber 11 forms the first liquid piston 17. Although water is used as the liquid, it is not limited to this. Although air is used as the working gas, helium may be used.

The second cylinder 2 is arranged at a predetermined distance from the first cylinder 1. The second cylinder 2 is provided with a second liquid chamber 21 in which liquid is stored, and a low temperature space 22 in which a working gas is filled above the liquid surface of the second liquid chamber 21. Second
The liquid in the liquid chamber 21 forms the second liquid piston 27.
The bottom of the second liquid chamber 21 and the bottom of the first chamber 11 have the liquid communication passage 1
It communicates through 5. The output cylinder 3 communicates with the liquid communication passage 15 via the resonance vibration tube 3c.

The path 4 connects the high temperature space 12 and the low temperature space 22. Further, a heat storage device 5 is arranged on the path 4. The heat storage device 5 is formed of a metal fiber aggregate or a metal mesh body having a large number of gas passages. Now, the main part will be described. The heater 7 is arranged on the first cylinder 1 side of the path 4. The heater 7 includes a heat-resistant glass substrate 70 integrally formed with the tube body forming the path 4. As can be seen from FIGS. 3 and 4, the base body 70 includes a flange portion 71 made of stainless steel. Further substrate 70
Is a heating chamber 73 communicating with the high temperature space 12 and the low temperature space 22.
Have. As can be understood from FIG. 2, the light receiving fin 74
Is a circular ring-shaped copper holding frame 75 having a through hole 75a.
The upper end portion 76i is composed of a large number of corrugated plates 76 made of copper, which are held on the holding frame 75 by brazing or welding. The lower ends 76f of the corrugated plate 76 are not connected to each other.

As can be understood from FIGS. 3 and 4, the light-receiving fin 74 is provided in the opening 71i of the flange portion 71 of the base body 70.
Is inserted into the heating chamber 73 from above in the figure, and in that state, the transparent glass plate 78 as a light transmitting portion is addressed to the step portion 71t of the inner peripheral portion of the flange portion 71 via the ring-shaped heat-resistant seals 76a and 76b. Then, the lid 79 is placed on the flange portion 71, and the mounting bolt 80 is screwed into the screw hole of the flange portion 71 in this state. Thereby, the heater 7 is assembled to the Stirling engine. The transparent glass plate 78 has heat resistance.

As shown in FIG. 3, the corrugated plate 76 which constitutes the light receiving fin 74 has a continuous wave shape of "dogleg shape" and "inverted dogleg shape". The crossing angle θ of the waves is set to about 90 °, but it is not limited to this and is 30 °, 6
It can be selected as appropriate, such as 0 ° and 120 °. The wave phases of the corrugated plates 76 are almost the same. Therefore, as can be understood from FIG. 3, the V-shaped corrugated portion forming one corrugated plate 76 faces the V-shaped corrugated portion forming the corrugated plate 76 adjacent thereto. The corrugated plate 76 of the light receiving fin 74 can be colored black to improve the light absorption.

In the above Stirling engine, the working gas flows in the directions of arrows X1 and X2. The corrugated plates 76 of the light receiving fin 74 are arranged substantially parallel to the directions of the arrows X1 and X2. This is for reducing the flow resistance of the working gas passing through the heating chamber 73. In this example, since the transparent glass plate 78 is sealed by the heat-resistant seals 76a and 76b, it is possible to avoid leakage of the working gas and heat from the heating chamber 73 to the outside, and even when it is installed outdoors, It is advantageous to prevent rainwater from entering the heating chamber 73.

Further, in this embodiment, a concave mirror 82 is arranged in the heating chamber 73 at a position facing the transparent glass plate 78. The concave mirror 82 has a substantially circular shape, and its central area 8
2h is recessed, and the focal position thereof is set in the area of the light receiving fin 74, and has a light focusing property. Therefore, even if the light that has passed through the transparent glass plate 78 and reaches the heating chamber 73 is not received by the light receiving fins 74, it is easily reflected by the concave mirror 82 and received by the light receiving fins 74.

In the liquid Stirling engine of this example, the light of the infrared lamp 95 or the sunlight passes through the transparent glass plate 78 and is received by the light receiving fins 74 of the heating chamber 73. Therefore, the light receiving fins 74 of the heating chamber 73 are changed by the energy of light.
Heats up. Since the working gas in the path 4 contacts the light receiving fins 4, the working gas is heated by the light receiving fins 74.
As with the conventional Stirling engine, the first liquid piston 17 and the second liquid piston 27 are repeatedly raised and lowered with a phase difference as the working gas is heated, and the liquid surface of the output cylinder 3 is repeatedly lowered accordingly. Going up, which takes the output.

In the liquid type Stirling engine, the driving principle is considered as follows. That is, the working gas in the heating chamber 73 that is in contact with the light receiving fins 74 is heated by the light receiving fins 74. Then, the heat is transferred to the heat storage unit 5 to be deprived of heat and the cooling pressure is lowered. Along with this, the liquid surface of the output cylinder 3 descends, and the liquid surface of the first liquid piston 17 and the liquid surface of the second liquid piston 27 both rise with a phase difference. Next, due to gravity, the liquid level of the first liquid piston 17 and the liquid level of the second liquid piston 27 tend to become the same, and the reaction causes the first liquid
The liquid surface of the second liquid piston 27 becomes higher than the liquid surface of the liquid piston 17. As a result, the cold working gas in the low temperature space 22 is transferred to the high temperature space 12 via the heat accumulator 5. The working gas thus transferred to the high temperature space 12 is the heat storage device 5 and the heating device 7.
Since the heat is taken from the light receiving fin 74 of No. 5 and is heated, the pressure of the working gas in the high temperature space 12 increases. Along with this, the liquid surface of the first liquid piston 17 and the liquid surface of the second liquid piston 27 both fall, and the liquid surface of the output cylinder 3 rises. This is repeated. The phase difference between the first liquid piston 17 and the second liquid piston 27 is considered to be caused by the line resistance of the liquid communication passage 15.

(Effects of the Embodiment) As described above, according to this embodiment, a method is adopted in which the working gas is heated by the light receiving fins 74 which are directly heated by light such as sunlight or infrared rays. Therefore, without using an electric heater,
The working gas of the Stirling engine can be heated. Alternatively,
Even if an electric heater is used, the light receiving fins 74 can be heated by the energy of light, so that the size can be reduced. Therefore, it is suitable when the Stirling engine is installed outdoors, which is restricted by the power supply surface. Of course, as long as the light receiving fins 74 can receive light from sunlight or an infrared lamp to raise the temperature, the invention can be applied to a Stirling engine installed indoors.

Further, in the present embodiment, since a large number of corrugated plates 76 are arranged in parallel to form the light receiving fin 74, the surface area of the light receiving fin 74 increases. Therefore, the light receiving area by the light receiving fins 74 is increased, and the temperature of the light receiving fins 74 can be efficiently raised. Further, the contact area between the light receiving fins 74 and the working gas is secured, which is advantageous for efficiently heating the working gas of the Stirling engine.

Further, in this embodiment, since the concave mirror 82 for reflecting the light toward the light receiving fins 74 is provided, the light is received by the light receiving fins 74 though the light passes through the transparent glass plate 78 and reaches the heating chamber 73. The reflected light is reflected by the concave mirror 82 toward the light receiving fin 74. In particular, since the concave mirror 82 has a light focusing property, the light reflected by the concave mirror 82 can surely reach the light receiving fin 74. As a result, the light receiving rate by the light receiving fins 74 is further improved, the temperature of the light receiving fins 74 can be raised more efficiently, and it is advantageous for heating the working gas.

Further, in the present embodiment, the phases of the waves of the corrugated plates 76 constituting the light receiving fins 74 are substantially the same, so that the corrugated plates 76 can be arranged in the heating chamber 73. It is advantageous. Also in this sense, it is advantageous to increase the light receiving area by the light receiving fins 74. In addition, in this example, since a large number of corrugated plates 76 are arranged in parallel to form the light-receiving fins 74, light that has once struck the corrugated plate 76 is re-disposed in the vicinity of the corrugated plates 7.
It is advantageous to make 6 receive light. That is, in FIG.
Since the light P that once hits one corrugated plate 76 is reflected, it is advantageous for causing the corrugated plate 76 in the vicinity to receive the light again.
It can contribute to the improvement of the light receiving rate.

Furthermore, in this embodiment, since the opening 71i formed in the base body 70 is closed by the transparent glass plate 78 in a hermetically closed state, rainwater can enter the heating chamber 73 even when the Stirling engine is installed outdoors. Intrusion is suppressed.
Of course, leakage of the working gas from the opening 71i can be suppressed.
Further, the continuous direction of the waves of each corrugated plate 76 forming the light-receiving fins 74, that is, the direction of the arrow H (see FIG. 4) is substantially perpendicular to the transparent glass plate 78, so that a large number of waves are generated in the heating chamber 73. The plate 76 can be arranged, which is advantageous for increasing the surface area of the corrugated plate 76. Even in this sense,
This is advantageous in increasing the light receiving area by the light receiving fins 74, and ensuring the contact area between the light receiving fins 74 and the working gas, which is advantageous in efficiently heating the working gas.

Further, in this embodiment, since the holding frame 75 holding the corrugated plates 76 is fixed to the step portion 71t of the flange portion 71 of the base body 70, even if the number of corrugated plates 76 is large, The holding property of 76 is improved. Also in this sense, it can contribute to the improvement of the light receiving rate. (Other Example) In the above-described embodiment, as can be understood from FIG. 1, the heater 7 is arranged between the first cylinder 1 having the high temperature space 12 and the heat accumulator 5, but the present invention is not limited to this. Bowl 7
Can be provided so as to directly face the high temperature space 12. Further, as shown by a phantom line in FIG. 1, a condenser 90 such as a convex lens having a condenser can be arranged in front of the transparent glass plate 78. According to this, the light receiving rate by the light receiving fin 74 is further improved. In some cases, the transparent glass plate 78 itself may be formed by a convex lens having a light converging property.

In the above-described embodiment, the heater for heating the working gas of the liquid Stirling engine is applied, but the heater is not limited to the liquid type, and may be applied to the heater for heating the working gas of a normal Stirling engine. It is applicable. (Supplementary Note) The following technical idea can be understood from the above-described embodiment. A cylinder part having a piston part that defines a high-temperature space in which the working gas expands and a piston part that defines a low-temperature space in which the working gas contracts, a path connecting the low-temperature space and the high-temperature space, and a heat storage device arranged in the path In a Stirling engine equipped with a heating device, the heating device includes a base having a heating chamber through which a working gas passes, a light-transmitting portion which is provided on the base and transmits light to the heating chamber by receiving light from the outside, and a heating unit. A Stirling engine, comprising: a light-receiving fin that is arranged in a room, receives light that has reached a heating chamber through a light-transmitting portion, and raises the temperature with the energy of light.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid Stirling engine according to an embodiment.

FIG. 2 is a perspective view of a light receiving fin.

FIG. 3 is a cross-sectional view of the heater in a direction perpendicular to the passage direction of the working gas.

FIG. 4 is a cross-sectional view of the heater as viewed in the direction of passage of the working gas. It is sectional drawing of a heater.

FIG. 5 is a cross-sectional view of a liquid Stirling engine according to a conventional example.

[Explanation of symbols]

In the figure, 1 is the first cylinder, 12 is the high temperature space, and 17 is the first
Liquid piston, 2 is second cylinder, 22 is low temperature space, 27
Is a second liquid piston, 4 is a path, 7 is a heater, 70 is a base, 73 is a heating chamber, 74 is a light receiving fin, 75 is a holding frame,
Reference numeral 76 is a corrugated plate, 78 is a transparent glass plate (transparent portion), and 82 is a concave mirror (reflecting mirror).

Claims (6)

[Claims] 1. A substrate arranged in a working gas path of a Stirling engine for heating and expanding the working gas, the base having a heating chamber through which the working gas passes, and a base provided on the base from the outside. A light-transmitting portion that receives light and allows the light to pass through the heating chamber, and a light-receiving fin that is disposed in the heating chamber of the base and receives the light that reaches the heating chamber through the light-transmitting portion and raises the temperature by the energy of the light. A Stirling engine heater characterized by being configured. 2. The heating for a Stirling engine according to claim 1, wherein a reflecting mirror for reflecting the light toward the light receiving fins is arranged in the heating chamber of the base body so as to face the light transmitting portion. vessel. 3. The heater for a Stirling engine according to claim 2, wherein the reflecting mirror is a concave mirror that reflects the light reaching the heating chamber through the light transmitting portion toward the light receiving fins. 4. The heater for a Stirling engine according to claim 1, wherein the light-receiving fin is formed by arranging at least two corrugated plates made of metal and having continuous corrugations. 5. The light transmitting portion is a transparent plate that closes the opening of the base body in a hermetically closed state, and the direction of continuous waves of the corrugated plate forming the light receiving fins is substantially perpendicular to the transparent plate. The heater for a Stirling engine according to claim 4, which is characterized in that. 6. The stirling according to claim 1, wherein the light-receiving fin is composed of a ring-shaped holding frame fixed to the base and a large number of corrugated plates held by the holding frame. Engine heater.