JP2002242761A - Stirring engine and power generating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in the reciprocating of a power piston in sliding contact with the inner wall of a cylinder, which results in a large mechanical drive loss, or poor efficiency in a low temperature difference. SOLUTION: Each of displacer body parts 10 and 10 comprising semilunar rotors 11b and 11b housed in a pair of housings 14 and 14 so as to be mutually reversely rotatable by shafts 12 and 12 alternately generates a pressurized state and a negative load state to drive a vibrating plate 33c in a voice coil generator 30 from both sides, and the reverse drive is performed so as to be matched to the resonance frequency of the vibrating plate 33c. Therefore, power generation can be performed while minimizing the mechanical drive loss of the vibrating plate 33c. Since a displacer drive motor 20 is driven by an output of the generated power, the mechanical link in the drive of a rotary displacer 11 is interrupted. The displacer driver motor 20 with a small mechanical drive loss is used, whereby the mechanical drive loss is further reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Stirling engine, and more particularly, to a Stirling engine for obtaining a power generation output and a power generation method.

[0002]

2. Description of the Related Art In a conventional Stirling engine, a reciprocating displacer piston is driven by applying a mechanical driving force from a power piston. The Stirling engine has a displacer main body in which a displacer piston periodically moves, and a power piston is usually arranged in a cylinder communicating with the displacer main body. Drives the displacer piston.

[0003]

In the above-mentioned conventional Stirling engine, there is a problem that a mechanical drive loss is large when the power piston reciprocates by sliding on the inner wall of the cylinder, and the efficiency is poor at a low temperature difference. Was. The present invention has been made in view of the above problems, and has as its object to provide a Stirling engine and a power generation method that can continue to operate efficiently even at a low temperature difference.

[0004]

In order to achieve the above object, according to the present invention, a displacer main body, a power generation section driven by the displacer main body to generate power, and a power generation output obtained by the power generation section are obtained. An electric motor for applying a driving force to the displacer body is provided.

In the first aspect of the present invention, the displacer main body drives the power generating section, and when the power generating section generates electric power, the electric power is output and the electric motor drives the displacer main body. . That is, there is no mechanical loop in which the power piston mechanically supplies the driving force to the displacer main body, and the mechanical driving loss is reduced. According to a second aspect of the present invention, in the Stirling engine according to the first aspect, the displacer body has a rotary displacer.

According to the second aspect of the present invention, the displacer body has a rotary displacer, and performs a periodic motion by a rotary motion.
Also, the direct rotational movement minimizes mechanical drive losses in the displacer itself. Further, according to a third aspect of the present invention, in the Stirling engine according to any one of the first and second aspects, the displacer body has a pair structure in which phases are inverted with respect to each other, and the pair structure has a difference. It is configured to generate pressure.

When the displacer periodically reciprocates between the high temperature side and the low temperature side, the gas filled therein generates a pressure difference according to the temperature. This pressure difference is larger as the internal pressure is higher, but it is difficult to obtain an output if the difference between the pressure and the external pressure is large when filling is performed under pressure. Claim 3 configured as described above.
In the invention according to the invention, the displacer body has a pair structure in which the phases are inverted with each other. If one of the pair is in a pressurized state, the other of the pair is in a negative pressure state, and the differential pressure generated in this pair structure is reduced. If it is taken out, the output can be obtained effectively regardless of the outside air pressure.

According to a fourth aspect of the present invention, in the Stirling engine according to the third aspect, the power generation unit has a voice coil generator and is driven by the differential pressure. In the invention according to claim 4 configured as described above, by applying the differential pressure generated in the pair structure to the voice coil generator of the power generation unit, the voice coil generator is reciprocally driven by the differential pressure generated alternately. Generate electricity.

In the voice coil generator, since the movable portion is supported by an edge having a damper property, mechanical drive loss at the time of displacement is extremely small, and high efficiency can be expected. Further, according to a fifth aspect of the present invention, in the Stirling engine according to the fourth aspect, the resonance frequency of the voice coil generator corresponds to the rotation speed of the paired structure. In the invention according to claim 5 configured as described above, since the resonance frequency of the voice coil generator corresponds to the rotation speed of the paired structure in the displacer main body, the mechanical drive loss in the voice coil generator is the least. Become smaller.

As described above, the method of electrically recovering the output of the displacer main body to generate the driving force is not necessarily limited to a substantial device, and it can be easily understood that the method also functions as the method. For this reason, the invention according to claim 6 generates a differential pressure in the displacer body having a pair structure in which the phases are inverted with each other, and generates electric power by reciprocatingly driving the voice coil generator at the same differential pressure. Then, a part thereof is supplied to an electric motor and used as a drive source for the displacer main body.

That is, there is no difference that the present invention is not necessarily limited to a substantial device but is also effective as a method. Of course, in this case as well, the above-described method of maximizing the efficiency can be applied. According to the invention according to claim 7, in the power generation method according to claim 6, the driving frequency of the displacer and the voice coil generator The configuration is such that the resonance frequency is matched.

[0012]

As described above, according to the present invention, the generated pressure difference is not mechanically returned to the displacer main body, so that the mechanical drive loss can be reduced, thereby utilizing even a low temperature difference. And a Stirling engine capable of doing so.

Further, according to the second aspect of the present invention, it is possible to reduce the mechanical drive loss in the displacer main body portion by using the rotary displacer, and to improve the overall efficiency. Further, according to the third aspect of the present invention, the differential pressure is generated by the paired structure,
Even if the gas is pressurized and filled, it can output effectively. In particular, there is no need to seal the difference between the outside air pressure and the movable part directly,
The sealing property generated at the time of pressurization hardly causes a problem.

Further, according to the invention according to claim 4,
Since power is generated using the voice coil generator, mechanical drive loss in the movable part can be extremely reduced. Furthermore, according to the fifth aspect of the invention, the driving force given from the outside can be minimized by utilizing the resonance phenomenon. Furthermore, according to the invention according to claim 6, a power generation method having the same effect can be provided, and according to the invention according to claim 7, optimum efficiency can be achieved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a main configuration of a Stirling engine according to an embodiment of the present invention, and FIG. 2 shows a circuit diagram of an electric configuration thereof. In FIG. 1, a displacer main body 10 has four rotary displacers 11, and two rotary displacers 11, 11 are coaxially connected. The shafts 12 connected to the rotary displacer 11 are supported in parallel to each other, and gears 13 having the same number of teeth are fixed to one end thereof. A displacer drive motor 20 and a drive gear 22 fixed to a drive shaft 21 are provided so as to mesh with the two gears 13 and rotate them in the same direction.

The displacer body 10 has a housing 14 for accommodating four rotary displacers 11. The housings 14 are formed for each rotary displacer 11, and two resonance type voice coil generators 30 are provided between the two sets of housings 14 as power generation units. 3 shows the rotary displacer 11 in a front view, and FIG. 4 shows the rotary displacer 11 in a cross-sectional view taken along the line AA in FIG.

The rotary displacer 11 has a columnar rotating core 11a at the center, and a semilunar rotor 11b is fixed to four grooves 11a1 formed in the rotating core 11a. Also, the two rotary displacers 11 are coaxially connected, and the shaft fixing holes 11a2 of the rotary core 11a are provided with angle fixing cut grooves 11a3 so that the fixed angle between the semicircular rotor 11b and the shaft 12 has a predetermined positional relationship. Is also formed.

A short columnar space is individually formed in the housing 14 so that each of the half moon rotors 11b can rotate, and a heat exchanger for forming a high temperature side and a low temperature side at an upper portion and a lower portion, respectively, is formed. The middle part forms a heat insulating layer. The rotational position of the half-moon rotor 11b with respect to the housing 14 will be referred to as the phase of the displacer body 10. FIG. 5 shows the correspondence of the phases in the pair of displacer main bodies 10, 10. The driving gears 22 rotate the respective gears 13, 13, and the housings 14, 14 via the shafts 12, 12.
When the half-moon rotor 11b accommodated in the main body rotates, the two displacer main bodies 10, 10 are in a relationship in which the phases are inverted by 180 degrees.

As described above, the pair of displacer main bodies 10, 10 have a phase relationship opposite to each other, and the voice coil generator 30 disposed between the pair of housings 14, 14 has a phase relationship from the respective housings 14, 14. A reversed pressure state and a negative pressure state are supplied. FIG. 6 shows a schematic configuration of the voice coil generator. A donut-shaped space 31a is formed in a yoke 31 having an E-shaped cross section which is formed in a cylindrical shape from the center of the inner bottom surface while having a cup shape having a circular outer shape. Is arranged. Magnet 3
The polarity of 2 is a direction in which the lines of magnetic force travel in a direction crossing the gap 31a. That is, in the yoke 31, the lines of magnetic force traverse radially from the central convex portion 31b toward the peripheral wall portion 31c.
3a is accommodated.

The coil 33a is wound around the gap 31a, and has cylindrical short-circuit yokes 33b1 and 33b2 disposed on the inner and outer surfaces thereof. The short yokes 33b1 and 33b2 serve to cancel lines of magnetic force generated by the current flowing through the coil 33a, and act to increase the power generation output. The coil 33a and the short-circuit yokes 33b1 and 33b2 are both fixed to a rigid and lightweight circular diaphragm 33c. It is elastically supported by the frame 33e.

The diaphragm 33c, the edge 33d, and the support frame 33
e is connected in an airtight manner, and as a result, forms an airtightly isolated space on both sides of the diaphragm 33c. A pair of the housings 14, 14 is connected to each space,
As described above, the pair of displacer bodies 10, 1
Since the phase of 0 is inverted by 180 degrees, this diaphragm 33c
, A differential pressure is applied from both sides. Here, in order to increase the pressure difference between the high temperature side and the low temperature side in the housing 14, the displacer main body 10 is filled with a pressurized gas. Normally, when the pressurized gas is filled, it becomes a problem to ensure the sealing performance between the power piston and the outside air. The sealing performance is hardly a problem.

Here, since the diaphragm 33c is elastically supported by the edge 33d, there is a unique resonance frequency. The resonance frequency is designed to coincide with the rotation speed of the shafts 12, 12, as described later. Therefore, when the shafts 12 and 12 rotate at the same resonance frequency, the vibration plate 33c
Vibrates at the resonance frequency, and the mechanical drive loss at the edge 33d is minimized. By the way, the electric circuit configuration of the present Stirling engine is as shown in FIG.
First, the coil 33a, which reciprocates by vibrating with the diaphragm 33c, vibrates in the lines of magnetic force and thus becomes a power generating coil, and its AC output is input to the rectifier circuit 34a.
The output of the rectifier circuit 34a is
b, and the output of the output matching circuit 34b becomes the output of the voice coil generator 30. Here, the output matching circuit 34b supplies power to the motor control circuit 34d via the diode 34c in order to rotationally drive the displacer driving motor 20 with a part of the power generation output. Is supplied to the displacer driving motor 20 so that

Once the Stirling engine starts rotating, the autonomous operation is continued by rotating the displacer drive motor 20 with its own power output, but at the start of operation, the displacer drive motor 20 must be driven by other than the power output. Must. For this reason, a start-up battery 34e1 for starting is provided, and when the start-up push button 34e2 is depressed, start-up power can be supplied to the motor control circuit 34d via the diode 34e3. Also, when the continuous operation is being performed, the starting battery 34e1
The charging power can be supplied from the output matching circuit 34b via the diode 34f1 and the resistor 34f2 so that the power is not consumed.

Thus, the paired housings 14, 1
4 houses the half moon rotors 11b, 11b and
The displacer main bodies 10, 10, which are configured to be able to rotate 180 degrees with respect to each other, alternately generate a pressurized state and a negative pressure state to drive the diaphragm 33 c of the voice coil generator 30 from both sides, and Since the inversion drive is made to match the resonance frequency of the diaphragm 33c, power can be generated with a minimum mechanical drive loss of the diaphragm 33c. In addition, since the displacer drive motor 20 is driven to rotate by the generated power, the mechanical link for driving the rotary displacer 11 is interrupted, and the displacer drive motor 20 having a small mechanical drive loss is used. As a result, high efficiency was achieved and practical operation was possible even at low temperature differences.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing a main configuration of a Stirling engine according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of the Stirling engine.

FIG. 3 is a front view of a rotary displacer.

FIG. 4 is a sectional view of a rotary displacer.

FIG. 5 is a diagram illustrating a phase difference of a displacer main body.

FIG. 6 is a sectional view of a voice coil generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Displacer main body part 11 ... Rotary displacer 11a ... Rotating core 11a1 ... Groove 11a2 ... Shaft hole 11a3 ... Groove 11b ... Half moon rotor 12 ... Shaft 13 ... Gear 14 ... Housing 20 ... Displacer drive motor 21 ... Drive shaft 22 ... Drive gear 30 ... Resonant voice coil generator 31... Yoke 31a. Output matching circuit 34c Diode 34d Motor control circuit 34e1 Starting battery 34e2 Starting push button 34e3 Diode 34f1 Diode 34f2 Resistance

Claims (7)

[Claims] 1. A displacer main body, a power generating section driven by the displacer main body to generate electric power, and an electric motor that obtains the generated output and applies a driving force to the displacer main body. Stirling engine. 2. The Stirling engine according to claim 1, wherein the displacer body has a rotary displacer. 3. The Stirling engine according to claim 1, wherein the displacer body has a pair structure in which phases are inverted with each other and generates a differential pressure with the pair structure. A Stirling engine characterized by the following. 4. The Stirling engine according to claim 3, wherein the power generation unit has a voice coil generator and is driven by the differential pressure. 5. The Stirling engine according to claim 4, wherein a resonance frequency of the voice coil generator corresponds to a rotation speed of the paired structure. 6. A differential pressure is generated in a displacer body having a paired structure in which phases are inverted with each other, and a voice coil generator is reciprocally driven by the differential pressure to generate electric power. A power generation method characterized in that the power is supplied to an electric motor and used as a drive source for the displacer body. 7. The power generation method according to claim 6, wherein the drive frequency of the displacer and the resonance frequency of the voice coil generator are matched.