JP2004092406A - Stirling engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a Stirling engine capable of being surely prevented from leakage of a working gas. <P>SOLUTION: The Stirling engine is provided with a pair of displacer cylinders, a pair of displacers, a displacer mechanism having a pair of expansion chambers and contraction chambers respectively into and from which the working gas flows with the action of a pair of the displacers, a power cylinder communicating to one of a pair of the expansion chambers or the contraction chambers of the displacer mechanism, a power piston mechanism having the piston arranged slidably in the power cylinder and divided into a first operating chamber and a second operating chamber, a first communicating passage communicating the first operating chamber with one of the expansion chamber or the contraction chamber, a second communicating passage communicating the second operating chamber with one of the other expansion chamber or the other contraction chamber, and a displacer operating mechanism operating the displacer with the power piston and the predetermined phase difference. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a Stirling engine, and more particularly to a displacer-type Stirling engine that can prevent leakage of working gas.
[0002]
[Prior art]
The displacer type Stirling engine includes a displacer cylinder, a displacer slidably disposed in the displacer cylinder, an expansion chamber and a contraction chamber into and out of which a working gas flowing with the operation of the displacer flows. A working chamber that communicates with one of the expansion chamber and the contraction chamber, a power piston that is operated in response to a change in pressure of the working gas in the working chamber, and a displacer that operates the displacer with a predetermined phase difference from the power piston An operating mechanism is provided, and an operating gas is contained in the displacer cylinder and the operating chamber. Such a Stirling engine operates a power piston in response to a pressure change in the working chamber caused by expansion and contraction caused by heating and cooling of a working gas. Therefore, as the working gas used in the Stirling engine, a gas having a small specific heat, such as hydrogen or helium, is used in order to improve thermal efficiency.
[0003]
[Problems to be solved by the invention]
Thus, gas having a small specific heat, such as hydrogen or helium, used as a working gas of a Stirling engine is liable to leak from a sliding portion due to a small size of a molecule. It is difficult to prevent leakage.
[0004]
The present invention has been made in view of the above circumstances, and a main technical problem thereof is to provide a Stirling engine that can reliably prevent leakage of working gas.
[0005]
[Means for Solving the Problems]
In order to solve the main technical problem, according to the present invention, a pair of displacer cylinders, a pair of displacers slidably disposed in the pair of displacer cylinders, and an operation of the pair of displacers are provided. A displacer mechanism having a pair of expansion chambers and contraction chambers into and out of which a working gas flowing therewith,
A power cylinder communicating with one of a pair of expansion chambers or contraction chambers of the displacer mechanism; and a power piston slidably disposed within the power cylinder and dividing into a first working chamber and a second working chamber. A power piston mechanism having
A first communication passage communicating with the first working chamber of the power piston mechanism and one of the expansion chamber or the contraction chamber of the displacer mechanism;
A second communication passage communicating with the second working chamber of the power piston mechanism and one of the other expansion chamber or contraction chamber of the displacer mechanism;
A displacer operating mechanism that operates the displacer with a predetermined phase difference from the power piston.
A Stirling engine is provided.
[0006]
The displacer operating mechanism includes a magnet movable body disposed on each of the pair of displacers, a cylindrical fixed yoke disposed on each of the pair of displacer cylinders and surrounding the magnet movable body, and And a pair of coils respectively disposed inside the yoke. The pair of displacers are connected to each other by a connecting rod, and the displacer operating mechanism includes a magnet movable body provided on one of the pair of displacers and a magnet movable body provided on one of the pair of displacer cylinders. And a pair of coils respectively arranged inside the fixed yoke. Further, the pair of displacers are connected to each other by a connecting rod, and the displacer operating mechanism includes a movable yoke connected to the pair of displacers, and an electromagnetic coil disposed to surround the movable yoke. ing.
[0007]
Further, the Stirling engine includes mechanical spring means for applying a predetermined vibration cycle to the pair of displacers. The mechanical spring means includes a pair of springs for urging the pair of displacers toward a neutral position.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of a Stirling engine configured according to the present invention will be described in more detail with reference to the accompanying drawings.
[0009]
FIG. 1 shows a cross-sectional view of one embodiment of a Stirling engine configured according to the present invention.
The Stirling engine of the embodiment shown in FIG. 1 includes a displacer mechanism 2 and a power piston mechanism 3. In the illustrated embodiment, the displacer mechanism 2 has a pair of displacer cylinders 21a and 21b disposed on both sides of the power piston mechanism 3 and slidably disposed in the pair of displacer cylinders 21a and 21b. A pair of displacers 22a and 22b are provided. As described above, in the pair of displacer cylinders 21a and 21b in which the pair of displacers 22a and 22b are slidably disposed, respectively, the expansion chamber 211a and the contraction chamber 212a and the expansion chamber 211b and the contraction chamber 212b are formed. You. In the illustrated embodiment, an expansion chamber 211a formed in one displacer cylinder 21a and an expansion chamber 211b formed in the other displacer cylinder 21b are arranged to face each other. In the illustrated embodiment, the pair of displacer cylinders 21a and 21b are made of a non-magnetic material such as an aluminum alloy. Further, the pair of displacers 22a and 22b are formed with a pair of side plates 221a and 222a and a pair of side plates 221b and 222b, respectively, and a heat insulating ring formed in an annular shape by a heat insulating material between the both side plates 221a and 222a and the side plates 221b and 222b. It is composed of regenerators 223a and 223b which are configured by alternately overlapping wire nets. A plurality of flow holes 224a, 225a and 224b, 225b are formed in both side plates 221a, 222a and both side plates 221b, 222b, respectively. In the illustrated embodiment, heating chambers 23a and 23b are formed around the expansion chambers 211a and 211b of the pair of displacer cylinders 21a and 21b, respectively, so that the heating fluid flows through the heating chambers 23a and 23b. It has become.
[0010]
The power piston mechanism 3 includes a power cylinder 31 formed of a non-magnetic material such as an aluminum alloy, and a power piston 32 made of a non-magnetic material slidably disposed in the power cylinder 31. . In the power cylinder 31 in which the power piston 32 is disposed as described above, a first working chamber 31a and a second working chamber 31b are formed on both sides of the power piston 32. The first working chamber 31a and the second working chamber 31b are respectively connected to the expansion chamber 211a of the one displacer cylinder 21a and the expansion chamber of the other displacer cylinder 21b by a first communication path 25a and a second communication path 25b. It communicates with 211b.
[0011]
As described above, the pair of displacer cylinders 21a and 21b, the power cylinder 31, and the first communication passage 25a and the second communication passage 25b form a closed space. Hydrogen is contained in the pair of displacer cylinders 21a and 21b and the first working chamber 31a, the second working chamber 31b, and the first communication passage 25a and the second communication passage 25b of the power cylinder 31 which are thus sealed. And a working gas having a low specific heat such as helium.
[0012]
The Stirling engine in the illustrated embodiment includes a pair of displacer operating mechanisms 4a and 4b that operate the pair of displacers 22a and 22b with a predetermined phase difference from the power piston 32, respectively. The pair of displacer operating mechanisms 4a and 4b are respectively connected to cases 41a and 41b made of a non-magnetic material and mounted on the outer end walls of the pair of displacer cylinders 21a and 21b, respectively, and a pair of displacers 22a and 22b. Actuating rods 42a and 42b made of a non-magnetic material and penetrating the end wall and inserted into the cases 41a and 41b, and magnet movable bodies 43a arranged on the outer peripheral surfaces of the actuating rods 42a and 42b, respectively. , 43b, and cylindrical fixed yokes 44a, 44b surrounding the magnet movable bodies 43a, 43b, respectively, and disposed inside the cases 41a, 41b, and axially inside the fixed yokes 44a, 44b. It has a pair of coils 45a, 46a and 45b, 46b respectively provided in parallel.
[0013]
The magnet movable bodies 43a and 43b are mounted on the outer peripheral surfaces of the operating rods 42a and 42b, and are provided with annular permanent magnets 431a and 431b having magnetic poles at both axial end surfaces, and are disposed axially outside the permanent magnets 431a and 431b. It is constituted by a pair of movable yokes 432a, 433a and 432b, 433b provided. Permanent magnets 431a and 431b in the illustrated embodiment have their right end faces magnetized to the N pole and their left end faces magnetized to the S pole in the figure. The pair of movable yokes 432a, 433a and 432b, 433b are formed in an annular shape by a magnetic material.
[0014]
The fixed yokes 44a and 44b are formed in a cylindrical shape from a magnetic material. A pair of coils 45a, 46a and 45b, 46b are disposed inside the fixed yokes 44a, 44b, respectively. The pair of coils 45a, 46a, 45b, 46b are respectively wound around bobbins 47a, 47b formed of a non-magnetic material such as synthetic resin and mounted along the inner periphery of the fixed yokes 44a, 44b, respectively. Have been. The pair of coils 45a, 46a and 45b, 46b are controlled so that the direction of the applied current is switched by the control means 10 described later.
[0015]
As described above, the displacer operation mechanisms 4a and 4b each including the magnet movable bodies 43a and 43b, the fixed yokes 44a and 44b, and the pair of coil coils 45a, 46a and 45b and 46b operate according to the principle of a linear motor. The operation will be described below with reference to FIG. Since the displacer operating mechanisms 4a and 4b have substantially the same configuration, only one displacer operating mechanism 4a will be described with reference to FIG.
In the displacer operating mechanisms 4a and 4b in the illustrated embodiment, as shown in FIGS. 2A and 2B, the N pole of the permanent magnet 431a (431b), one movable yoke 432a (432b), A magnetic circuit is formed that passes through the S pole of one of the coils 45a (45b), the fixed yoke 44a (44b), the other coil 46a (46b), and the other movable yoke 433a (433b) and the permanent magnet 431a (431b). In such a state, when currents in opposite directions are applied to the pair of coils 45a, 46a (45b, 46b) in the directions shown in FIG. 2A, the magnet movable bodies 43a (43b) follow Fleming's left-hand rule. That is, a thrust is generated in the displacer 22a (22b) to the right as shown by the arrow in FIG. On the other hand, when a current is applied to the pair of coils 45a, 46a (45b, 46b) in the opposite direction to that shown in FIG. 2A as shown in FIG. 2B, the magnet movable body 43a ( 43b), that is, a thrust is generated in the displacer 22a (22b) to the left as shown by the arrow in FIG.
[0016]
The Stirling engine of the embodiment shown in FIG. 1 includes displacer position detecting means 5a and 5b for detecting the operating positions of the pair of displacers 22a and 22b, respectively. The displacer position detecting means 5a, 5b is composed of a stroke sensor for detecting the movement position of the actuators 51a, 51b, one end of which is connected to the displacers 22a, 22b, respectively, and sends a detection signal to the control means 10, which will be described later. . The output values of the stroke sensors as the displacer position detecting means 5a and 5b will be described with reference to FIG. In FIG. 3, the horizontal axis indicates the stroke of the displacers 22a and 22b, that is, the actuators 51a and 51b, and the vertical axis indicates the voltage value. As shown in FIG. 3, the stroke sensor outputs a voltage value proportional to the stroke of the displacers 22a and 22b, that is, the actuators 51a and 51b. In the horizontal axis of FIG. 3, L1 is a return-side full stroke position, and L10 is a feed-side full stroke position.
[0017]
The Stirling engine of the embodiment shown in FIG. 1 includes mechanical spring means 6a, 6b for applying a predetermined vibration cycle to the pair of displacers 22a, 22b. The mechanical spring means 6a, 6b comprises a pair of coil springs 61a, 62a, 61b, 62b disposed on both sides of the displacers 22a, 22b, respectively. The pair of springs 61a, 62a, 61b, 62b are connected to the displacers 22a, 22b. Are biased toward each other toward the neutral position. The vibration cycle is determined by the mass of the pair of coil springs 61a, 62a and 61b, 62b and the displacers 22a, 22b. Therefore, by operating the displacers 22a, 22b at a predetermined cycle determined by the mass of the pair of coil springs 61a, 62a, 61b, 62b and the displacers 22a, 22b, the driving force by the displacer operating mechanisms 4a and 4b may be extremely small. . That is, when the displacer 5 is actuated by the displacer operating mechanisms 4a and 4b at the above-mentioned predetermined cycle, the amplitude of the pair of coil springs 61a, 62a and 61b, 62b, that is, the moving width of the displacers 22a, 22b gradually increases due to the simple vibration. Value, and steady operation. After that, the displacers 22a and 22b are operated at a predetermined cycle by the action of the pair of coil springs 61a, 62a and 61b and 62b. What is necessary is just to supplement with driving force.
[0018]
The control means 10 is composed of a microcomputer and is connected to the battery 11, and has a central processing unit (CPU) for performing arithmetic processing according to a control program, a read-only memory (ROM) for storing a control program, etc. And a drive circuit for driving a pair of coils 45a, 46a and 45b, 46b of the displacer operating mechanisms 4a, 4b. The control means 10 sends a pair of coils 45a, 46a and 45b, 46b constituting the displacer operating mechanisms 4a, 4b based on the operating position signals of the displacers 22a, 22b detected by the displacer position detecting means 5a, 5b. To control the driving current.
[0019]
The power piston 32 and the power cylinder 31 constituting the power piston mechanism 3 are provided with the generator 12. The generator 12 is a linear generator in the illustrated embodiment, and includes an annular permanent magnet 121 disposed on an outer peripheral surface of a power piston 32 and magnetic materials disposed on both sides of the permanent magnet 121. And power generating coils 124 disposed on the outer peripheral surface of the power cylinder 31 so as to surround the permanent magnet 121. The power generator 12 configured as described above generates power by reciprocating the power piston 32, that is, the permanent magnet 121 left and right in FIG. 1, and charges the battery 11 with the generated power.
[0020]
The Stirling engine of the embodiment shown in FIG. 1 is configured as described above, and its operation will be described below with reference to a flowchart shown in FIG. 4 and an explanatory diagram showing an operation state shown in FIG.
FIG. 1 shows a state before starting, and the displacers 22a and 22b are positioned at neutral positions by the action of a pair of coil springs 61a, 62a and 61b and 62b. To start the Stirling engine from the state shown in FIG. 1, the control means 10 drives the displacer operating mechanisms 4a and 4b so as to operate the displacers 22a and 22b rightward in the figure (step S1). That is, the control means 10 controls the pair of coils 45a, 46a and 45b, 46b constituting the displacer operating mechanisms 4a, 4b so as to apply currents in opposite directions in the direction shown in FIG. As a result, the magnet movable bodies 43a and 43b, that is, the displacers 22a and 22b move rightward as shown in FIG. Due to the rightward movement of the displacers 22a and 22b, the working gas in the contraction chamber 212a of one displacer cylinder 21a flows into the expansion chamber 211a through the displacer 22a, and the working gas in the expansion chamber 211b of the other displacer cylinder 21b. Flows into the contraction chamber 212b through the displacer 22b. At this time, the working gas that has been cooled in the contraction chamber 212a of the one displacer cylinder 21a is exchanged and heated when passing through the regenerator 223a that forms the displacer 22a as described above. The working gas heated in the expansion chamber 211b of the other displacer cylinder 21b is cooled by being exchanged with heat when passing through the regenerator 223b constituting the displacer 22b as described above. When one of the displacers 22a moves rightward and the working gas flows into the expansion chamber 211a, the working gas is heated and expanded by the heating fluid flowing through the heating chamber 23a. 31 flows into the first working chamber 31a. As a result, the power piston 32 moves to the left as shown in FIG. On the other hand, when the other displacer 22b moves to the right and the working gas flows into the contraction chamber 212b, the working gas is cooled by air cooling or an appropriate cooling means and contracts, so that the second working chamber 31b of the power cylinder 31 is cooled. The working gas is sucked through the second communication passage 25b. As a result, the power piston 32 moves to the left as shown in FIG.
[0021]
As described above, if the displacer operating mechanisms 4a and 4b are driven so that the pair of displacers 22a and 22b are operated rightward in the drawing in step S1, the control means 10 proceeds to step S2 and proceeds to the displacer position detecting means 5a. 5b, it is checked whether or not the stroke position L of the displacers 22a, 22b is larger than a stroke position L9 which is a threshold value which is a predetermined amount before the feed-side full stroke position L10 (L> L9). I do. If the stroke position L is not larger than L9, the control means 10 proceeds to step S3, and determines whether the stroke position L of the displacers 22a, 22b is smaller than the stroke position L2 which is a threshold value a predetermined amount before the return full stroke position L1. Check whether or not (L <L2). In this case, since the displacers 22a and 22b have moved to the feed side, the stroke position L is not smaller than L2, and the control means 10 returns to step S2.
[0022]
If the stroke position L is larger than L9 in step S2, the control means 10 determines that the displacers 22a and 22b have moved beyond a position a predetermined amount before the position at the end of the expansion shown in FIG. Proceeding to S4, the displacer operating mechanisms 4a and 4b are driven so that the displacers 22a and 22b are operated leftward in the drawing. That is, the control means 10 controls the pair of coils 45a, 46a and 45b, 46b constituting the displacer operation mechanisms 4a, 4b so as to apply currents in opposite directions in the direction shown in FIG. 2B. As a result, the magnet movable bodies 43a and 43b, that is, the displacers 22a and 22b move to the left as shown in FIG. As the displacers 22a and 22b move to the left, the working gas in the expansion chamber 211a of one displacer cylinder 21a flows into the contraction chamber 212a through the displacer 22a, and the working gas in the contraction chamber 212b of the other displacer cylinder 21b. Flows into the expansion chamber 211b through the displacer 22b. At this time, the working gas that has been heated in the expansion chamber 211a of the one displacer cylinder 21a undergoes heat exchange and is cooled when passing through the regenerator 223a constituting the displacer 22a as described above. The working gas cooled in the contraction chamber 212b of the other displacer cylinder 21b is heated and exchanged when passing through the regenerator 223b constituting the displacer 22b as described above. When one of the displacers 22a moves to the left and the working gas flows into the contraction chamber 212a in this way, the working gas is cooled by air cooling or an appropriate cooling means and contracts, so that the first working chamber 31a of the power cylinder 31 is compressed. Is sucked through the first communication passage 25a. As a result, the power piston 32 moves rightward as shown in FIG. On the other hand, when the other displacer 22b moves to the left and the working gas flows into the expansion chamber 211b, it is heated and expanded by the heating fluid flowing through the heating chamber 23b, so that the second cylinder of the power cylinder 31 passes through the second communication passage 25b. Into the working chamber 31b. As a result, the power piston 32 moves rightward as shown in FIG.
[0023]
On the other hand, as described above, if the displacer operating mechanisms 4a and 4b are driven so that the pair of displacers 22a and 22b are operated leftward in the drawing in step S4, the control means 10 returns to step S2 and returns to the displacer 22a. , 22b is larger than a stroke position L9 which is a threshold value which is a predetermined amount before the full-stroke position L10 on the feed side. In this case, since the displacers 22a and 22b are moving to the return side, the stroke position L is not larger than L9, so the control means 10 proceeds to step S3 and the stroke position L of the displacers 22a and 22b is set to the return side full stroke. It is checked whether it is smaller than a stroke position L2 which is a threshold value which is a predetermined amount before the position L1. If the stroke position L is not smaller than L2, the control means 10 determines that the displacers 22a and 22b have not yet reached L2, returns to step S2, and repeatedly executes steps S2 and S3. If the stroke position L of the displacers 22a, 22b is smaller than L2 in step S3, the control means 10 determines that the displacers 22a, 22b have exceeded L2, and proceeds to step S5 to operate the displacers 22a, 22b rightward in the figure. In order to drive the displacer operating mechanisms 4a and 4b, currents in opposite directions are applied to the pair of coils 45a, 46a and 45b and 46b in the directions shown in FIG.
[0024]
By repeating the above cycle, the power piston 32 can reciprocate. As the power piston 32 reciprocates, the generator 12 generates power, and the generated power is charged in the battery 11. In the Stirling engine in the illustrated embodiment, the pair of displacer cylinders 21a and 21b, the power cylinder 31, and the first communication passage 25a and the second communication passage 25b form a closed space, so that the working fluid leaks. Can be reliably prevented. Further, in the Stirling engine in the illustrated embodiment, the pair of displacers 22a, 22b are operated at a predetermined cycle by the action of the pair of coil springs 61a, 62a and 61b, 62b, so that the displacers 22a, 22b are operated at a predetermined cycle. The displacer operating mechanisms 4a and 4b need only have a driving force to compensate for the attenuation due to air resistance or the like, and the driving force for operating the displacer operating mechanisms 4a and 4b can be reduced. If the pair of displacers 22a and 22b are connected by a connecting rod and configured to operate integrally, any one displacer operating mechanism may be used.
[0025]
Next, another embodiment of the Stirling engine configured according to the present invention will be described with reference to FIG. In the embodiment of FIG. 6, the same members as those of the Stirling engine shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
The Stirling engine shown in FIG. 6 has a displacer operating mechanism that connects a pair of displacers 22a and 22b by a connecting rod 7 and operates the pair of displacers 22a and 22b with a predetermined phase difference (180 degrees) with the power piston 32. 8a and 8b, and the other configuration is substantially the same as the embodiment of FIG. In the illustrated embodiment, since the pair of displacers 22a and 22b are connected by the connecting rod 7, the mechanical spring means 6a and 6b include a pair of displacers 22a and 22b disposed on both outer sides of the pair of displacers 22a and 22b. And coil springs 61a and 62b. The electromagnetic solenoids 8a and 8b as the displacer operating mechanism are composed of cases 81a and 81b made of a magnetic material mounted on outer end walls of a pair of displacer cylinders 21a and 21b, respectively, and end walls 811a and 811b of the cases 81a and 81b. And fixed yokes 82a and 82b projecting from the inner walls of the first and second displacer cylinders 21a and 21b, respectively. The movable yokes 83a and 83b are disposed in the case 82a, and the exciting coils 85a and 85b are disposed in the cases 82a and 82b and wound around the bobbins 84a and 84b.
[0026]
When the exciting coil 85a of the electromagnetic solenoid 8a is controlled by the control means 10 to be excited, the movable yoke 83a moves rightward in the drawing and the displacer 22a and 22b are operated to the right. When the exciting coil 85b of the electromagnetic solenoid 8b is controlled and excited by the control means 10, the movable yoke 83b moves leftward in the drawing, and the displacers 22a and 22b are operated leftward. During the operation of the Stirling engine, the displacers 22a and 22b are operated at a predetermined cycle by the action of the pair of springs 61a and 62b, so that the electromagnetic solenoids 8a and 8b are operated to the extent that the displacement of the displacers 2a and 22b is compensated. It only has to be driven.
[0027]
Next, still another embodiment of the Stirling engine configured according to the present invention will be described with reference to FIG. In the Stirling engine shown in FIG. 7, a magnetic drive mechanism 13 is provided in place of the power piston 32 and the generator 12 provided in the power cylinder 31 constituting the power piston mechanism 3 in the embodiment shown in FIG. It was done. The illustrated magnetic drive mechanism 13 includes a pair of annular permanent magnets 131 and 132 disposed on the outer periphery of the power piston 32 at a predetermined interval. In the illustrated embodiment, one of the permanent magnets 131 is set to have an N pole on the left side and an S pole on the right side in the figure, and the other permanent magnet 132 has an N pole on the right side and an S pole on the left side in the figure. Is set. Annular pole pieces 133, 134, 135 made of a magnetic material are disposed between both sides of the pair of permanent magnets 131, 132 in the axial direction and between the permanent magnets 131, 132. On the other hand, on the outer periphery of the power cylinder 31, an annular core 136 made of a magnetic material is disposed so as to be slidable in the axial direction. Annular projections 136a, 136b, 136c facing the pole pieces 133, 134, 135 are formed on the inner peripheral surface of the core 136. Further, annular slide bushes 137 and 138 are mounted on both sides of the inner peripheral surface of the core 136. A drive rod 139 connected to an unillustrated work is mounted on the outer peripheral surface of the core 136.
[0028]
The magnetic drive mechanism 13 configured as described above is provided between the pair of permanent magnets 131, 132 and the pole pieces 133, 134, 135 disposed on the power piston 32 and the core 136 disposed on the power cylinder 31. A magnetic circuit indicated by an arrow in the drawing is formed. Therefore, when the power piston 32 moves left and right in the drawing, the core 136 moves following the magnetic force caused by the magnetic circuit. As a result, an unillustrated workpiece can be operated via the driving rod 139 mounted on the core 136.
[0029]
In the embodiment shown in FIG. 7, the power piston 32 is provided with the permanent magnets 131 and 132 and the pole pieces 133, 134 and 135, and the power cylinder 31 is provided with the core 136. A permanent magnet may be provided in the cylinder 31 and a core may be provided in the power piston 32.
[0030]
As described above, the present invention has been described based on the illustrated embodiments. However, the present invention is not limited to the examples, and various modifications are possible. For example, in the illustrated embodiment, an example in which the first working chamber 31a and the second working chamber 31b of the power cylinder 31 constituting the power piston mechanism 3 communicate with the expansion chambers 211a and 211b of the displacer cylinders 21a and 21b. However, the expansion chambers 211a and 211b and the contraction chambers 212a and 212b of the displacer cylinders 21a and 21b may be reversed so that the first working chamber and the second working chamber communicate with the contraction chamber.
[0031]
【The invention's effect】
Since the Stirling engine according to the present invention is configured as described above, the following effects can be obtained.
That is, a pair of displacer cylinders forming a displacer mechanism, a first working chamber of a power cylinder and a power piston mechanism forming a power piston mechanism, and a first communication chamber communicating with one of one expansion chamber or contraction chamber of the displacer mechanism. Since the passage and the second communication passage communicating with the second working chamber of the power piston mechanism and one of the other expansion chamber or the contraction chamber of the displacer mechanism form a closed space, leakage of the working fluid is ensured. Can be prevented. Therefore, there is no need for a working fluid tank for replenishing leakage of the working fluid.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing one embodiment of a Stirling engine configured according to the present invention.
FIG. 2 is an operation explanatory view of a displacer operating mechanism constituting the Stirling engine configured according to the present invention.
FIG. 3 is an explanatory diagram showing an output signal of a displacer position detecting means constituting the Stirling engine constituted according to the present invention.
FIG. 4 is a flowchart showing an operation procedure of a control unit constituting the Stirling engine constructed according to the present invention.
FIG. 5 is an explanatory diagram showing an operation state of the Stirling engine shown in FIG. 1;
FIG. 6 is a sectional view showing another embodiment of a Stirling engine configured according to the present invention.
FIG. 7 is a cross-sectional view of a main part showing still another embodiment of a Stirling engine configured according to the present invention.
[Explanation of symbols]
2: Displacer mechanism
21a, 21b: Displacer cylinder
211a, 211b: expansion chamber
212a, 212b: contraction chamber
22a, 22b: Displacer
23a, 23b: heating chamber
3: Power piston mechanism
31: Power cylinder
31a: First working chamber
31b: second working chamber
32: Power piston
4a, 4b: Displacer operating mechanism
41a, 41b: Case
42a, 42b: operating rod
43a, 43b: magnet movable body
44a, 44b: fixed yoke
45a, 46a: a pair of coils
45b, 46b: a pair of coils
5a, 5b: displacer position detecting means
6a, 6b: mechanical spring means
61a, 62a: a pair of coil springs
61b, 62b: a pair of coil springs
7: Connecting rod
8a, 8b: electromagnetic solenoid (displacer operating mechanism)
81a, 81b: Case
82a, 82b: fixed yoke
83a, 83b: movable yoke
84a, 84b: bobbin
85a, 85b: excitation coil
10: Control means
11: Battery
12: Generator
121: permanent magnet
122, 123: pole piece
124: power generation coil
13: Magnetic drive mechanism
131, 132: a pair of permanent magnets
133, 134, 135: pole piece
136: Core
137138: Slide bush
139: Drive rod

Claims (6)

A pair of displacer cylinders, a pair of displacers slidably disposed in the pair of displacer cylinders, and a pair of expansion chambers and a contraction, respectively, through which a working gas flowing with the operation of the pair of displacers flows in and out. A displacer mechanism having a chamber;
A power cylinder communicating with one of a pair of expansion chambers or contraction chambers of the displacer mechanism; and a power piston slidably disposed within the power cylinder and dividing into a first working chamber and a second working chamber. A power piston mechanism having
A first communication passage communicating with the first working chamber of the power piston mechanism and one of the expansion chamber or the contraction chamber of the displacer mechanism;
A second communication passage communicating with the second working chamber of the power piston mechanism and one of the other expansion chamber or contraction chamber of the displacer mechanism;
A displacer operating mechanism that operates the displacer with a predetermined phase difference from the power piston.
A Stirling engine characterized by the following: The displacer operating mechanism includes a magnet movable body disposed on each of the pair of displacers, and a cylindrical fixed yoke disposed on each of the pair of displacer cylinders and surrounding the magnet movable body. The Stirling engine according to claim 1, further comprising a pair of coils disposed inside the fixed yoke. The pair of displacers are connected to each other by a connecting rod,
The displacer operating mechanism includes a magnet movable body provided on one of the pair of displacers, and a cylindrical fixed yoke provided on one of the pair of displacer cylinders and surrounding the magnet movable body. The Stirling engine according to claim 1, further comprising: a pair of coils disposed inside the fixed yoke. The pair of displacers are connected to each other by a connecting rod,
The Stirling engine according to claim 1, wherein the displacer operating mechanism includes a movable yoke connected to the pair of displacers, and an electromagnetic coil surrounding the movable yoke. 2. The Stirling engine according to claim 1, further comprising mechanical spring means for applying a predetermined vibration period to said pair of displacers. 6. The Stirling engine according to claim 5, wherein said mechanical spring means comprises a pair of springs for urging said pair of displacers toward a neutral position.

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