JP2001349247A - Stirling cycle engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correctly arrange a regenerator between a cylindrical part of a case and a cylinder in a Stirling cycle engine. SOLUTION: An almost short cylindrical protective body 26 is arranged for covering the outer periphery of the regenerator 10. An O ring 28 being a seal member is arranged on the outer peripheral side of the protective body 26. An outside projection 24 is formed on the tip side outer periphery of the cylinder 7. When successively incorporated by inserting the regenerator 10 into the cylindrical part 2, the outer periphery of the regenerator 10 is protected by the protective body 26, and the outer periphery is not turned up. The O ring 28 contacts with an inside surface of the case 1, and can be sealed and incorporated. The tip side of the outside projection 24 is inserted up to a position for abutting to an endothermic fin 12, and the endothermic fin 12 does not abut to an end part of the regenerator 10 so that collapse of the end part of the regenerator 10 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a free piston type Stirling cycle engine, and more particularly, to a free piston type Stirling cycle engine.
The present invention relates to a structure for facilitating assembly of a portion for changing a state of a gas sealed therein.

[0002]

The Stirling cycle engine includes a piston in a cylinder reciprocating in an axial direction, and when the piston moves in a displacer direction, a gas in a compression chamber formed between the piston and the displacer is formed. Is compressed to pass through the heat dissipating fins, the regenerator, and the heat absorbing fins to reach the distal end of the cylinder and the expansion chamber formed at the distal end, and push down the displacer. On the other hand, when the piston moves in the opposite direction to the displacer, the inside of the compression chamber becomes negative pressure, and the gas returns from the expansion chamber to the compression chamber in the cylinder through the heat absorbing fins, the regenerator, and the radiation fins. , Push up the displacer.
During such a process, a reversible cycle consisting of two isothermal changes and an equal volume change is performed, and the heat-absorbing fins mounted on the outer periphery of the tip of the cylinder have a low temperature, while the external radiating fins mounted on the outer circumference of the base have a high temperature. Become.

[0003] The regenerator is formed into a thick, short cylindrical shape by winding a resin film having an uneven surface on a cylinder. The following method is conventionally used for assembling the regenerator into the case. First, heat absorbing fins as heat absorbing members are inserted into a cylindrical case and fixed. Next, a regenerator is inserted into the case. Then, the radiation fins are inserted into the case and fixed. Finally, the cylinder is inserted. Alternatively, first, a heat absorbing fin, a regenerator, and a heat radiating fin are attached to the outer periphery of the cylinder. Next, a heat absorbing fin as a heat absorbing member, a regenerator and a heat radiating fin together with the cylinder are inserted into the cylindrical case.

However, in such a mounting, when the regenerator is inserted into the case, the outer end of the regenerator comes into contact with the inner surface of the case and is turned up, or the inner end of the regenerator is attached to the cylinder. Or the outer surface of the regenerator is displaced by contact with the outer surface of the regenerator, and the assemblability deteriorates. As a result, the airflow in the regenerator may be obstructed. Conversely, when the end of the regenerator is turned up, a gap is formed between the regenerator and the case, and there is a possibility that the airflow passes through the gap and the airflow passing through the regenerator decreases.

The present invention solves the above problems, and provides a Stirling cycle engine capable of improving assemblability and enabling a regenerator to be correctly disposed between a cylindrical portion of a case and a cylinder. The purpose is to:

[0006]

According to a first aspect of the present invention, there is provided a Stirling cycle engine having a cylindrical case, a cylinder coaxially inserted into the case, and a cylinder disposed between the case and the cylinder. A heat absorbing member and a heat radiating member, and a regenerator disposed between the two members, and a substantially cylindrical protective body covering at least the outer periphery of the regenerator is provided.

According to the first aspect of the present invention, at least the outer periphery of the regenerator is covered with a protective body and inserted into the case, whereby the regenerator is mounted in the case.

According to a second aspect of the present invention, in the Stirling cycle engine according to the first aspect, a substantially cylindrical bobbin is provided on an inner peripheral side of the regenerator, and the cylinder is provided on an inner peripheral side of the bobbin. It is configured to be insertable.

According to the second aspect of the present invention, a regenerator is attached to the outer periphery of the bobbin, the outer periphery of the regenerator is covered with a protective body, and the regenerator and the protective body are attached. By inserting the bobbin into the case and further inserting the cylinder into the bobbin, the tip of the body is assembled.

According to a third aspect of the present invention, there is provided a Stirling cycle engine according to the first or second aspect, wherein a projection is formed on an outer periphery of the cylinder or the bobbin.

According to the third aspect of the present invention, the regenerator is positioned with respect to the cylinder or the bobbin by the protrusion formed on the cylinder or the bobbin, and the regenerator is inserted when the regenerator is inserted. The end portion is prevented from being crushed by contacting the heat absorbing member or the heat radiating member.

Further, according to a fourth aspect of the present invention, in the Stirling cycle engine according to the first to third aspects, a seal member is provided on an outer peripheral side of the protective body.

According to the fourth aspect of the present invention, the seal member contacts and seals the inner surface of the case even if the inner surface of the case is not strictly cylindrical. When the gas sealed in the Stirling cycle engine passes through the regenerator, it does not pass through a portion other than the regenerator.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. In the figure, 1
Is a case composed of a cylindrical part 2 and a body part 3 formed in a substantially cylindrical shape, and the cylindrical part 2 is composed of a base part 4 made of aluminum or the like, an intermediate part 5 made of stainless steel or the like, and copper or the like. And a distal end portion 6.

A cylinder 7 extending to the body 3 is coaxially inserted into the cylinder 2 and a displacer 8 is slidable in the cylinder 7 in the axial direction. Is housed. An expansion chamber E is formed between the tip of the cylinder 7 and the tip 6, and the inside and the outside of the cylinder 7 are communicated by the gap 9. Also,
A regenerator 10 is provided on the outer periphery of the cylinder 7 in the intermediate portion 5, and a communication hole 11 communicating between the inside and the outside of the cylinder 7 is formed in the base 4. Heat absorbing fins 12 are provided on the outer periphery of the tip of the cylinder 7, and the regenerator 1
Radiation fins 13 are provided on the outer periphery of the cylinder 7 between 0 and the communication hole 11. Then, a gap 9 from the inner end of the cylinder 7, a heat absorbing fin 12, which is a heat absorbing member, a regenerator 10,
A path is formed to reach the compression chamber C in the cylinder 7 through the radiating fin 13 serving as a radiating member and the communication hole 11.

External radiating fins 14 are provided on the outer periphery of the base 4.
Is attached. A piston 15 is slidably accommodated in the cylinder 7 in the body 3 in the axial direction. The base end of the piston 15 is coaxially connected to the drive mechanism 16.

The driving mechanism 16 includes a frame 17 formed in a short cylindrical shape.
And a magnet group fixed to one end of this frame 17 by bonding or the like
And a ring-shaped electromagnetic coil 19 provided close to the outer periphery of the magnet group 18. The magnet group 18 is configured by arranging permanent magnets 20 formed in a flat plate shape in a cylindrical shape. In addition, 21 is a rod for limiting the amplitude of the displacer 8, and 22 and 23 are spiral leaf springs.

The regenerator 10 is formed in a substantially short cylindrical shape by winding a film 10A having an uneven surface on the surface, so that it can be ventilated in the axial direction. They have the same diameter. On the other hand, the outer diameter of the regenerator 10 is formed smaller than the inner diameter of the cylindrical portion 2. A flange-shaped outer projection 24 is formed near the front end of the outer periphery of the cylinder 7, and a plurality of through holes 25 are formed in the outer projection 24 in the axial direction. For this reason, the leading end side of the film 10A is attached to the outer periphery of the cylinder 7 in contact with the outer projection 24. In addition, the regenerator 10
A short cylindrical protective body 26 having substantially the same length as the axial length of the regenerator 10 is attached to the outer periphery of the regenerator 10. This protector
At both ends of the outer periphery of 26, that is, near the distal end side and the proximal end side, grooves 27 are formed, and O-rings 28 as seal members are attached to these grooves 27.
Abuts on the inner periphery of the cylindrical portion 2. Further, an inner protrusion 29 is formed in a flange shape on the base end side of the inner periphery of the protection body 26, and the inner protrusion 29 has a plurality of through holes 30.
Are formed in the axial direction.

Next, the assembly of the regenerator 10 and the like will be described. First, the heat absorbing fins 12 are inserted into the cylindrical portion 2 and fixed, and a regenerator is formed by winding the film 10A into a substantially short cylindrical shape.
Insert the cylinder 7 into the inner periphery of the cylinder 10. At this time, the outer protrusion
The regenerator 10 is positioned so that the distal end side of the regenerator 10 is in contact with the base end surface of the regenerator 24. And the regenerator
The protection body 26 is attached to the outer periphery of the protection member 10, and an O-ring 28 is further attached to the outer periphery of the protection body 26. At this time, the regenerator 10 is attached so that the proximal end side of the regenerator 10 abuts on the inner protrusion 29. Thereafter, the heat radiation fins 13 are further attached to the base end side of the regenerator 10. In this way, the regenerator 10, the protective body 26, the O-ring 28, and the radiating fins 13 are integrated, inserted into the cylindrical portion 2, and sequentially incorporated.

Therefore, when an alternating current is applied to the electromagnetic coil 19, an alternating magnetic field is generated, and a force for moving the magnet group 18 in the axial direction is applied by the alternating magnetic field. By this force, the piston 15 reciprocates in the cylinder 7 in the axial direction. Therefore, when the piston 15 moves in the direction of the displacer 8, the gas in the compression chamber C formed between the piston 15 and the displacer 8 is compressed, and the communication hole 11, the radiation fin 13, and the through hole 30 are compressed. , Regenerator 10, through hole 25, heat absorbing fin 12,
The displacer 8 is pushed down while reaching the expansion chamber E formed between the tip end of the cylinder 7 and the tip end portion 6 through the gap 9. On the other hand, piston 15 is displacer 8
Moves in the opposite direction, the inside of the compression chamber C becomes negative pressure, and the gas flows from the expansion chamber E to the gap 9, the through hole 25, the heat absorbing fins.
12, the flow returns to the compression chamber C in the cylinder 7 through the regenerator 10, the through hole 30, the radiation fin 13, and the communication hole 11, thereby pushing up the displacer 8. During such a process, a reversible cycle consisting of two isothermal changes and an equal volume change is performed, so that the heat absorbing fins 12 attached to the outer periphery of the tip of the cylinder 7 have a low temperature, while the external heat radiation fin attached to the outer periphery of the base 4 is The fins 14 become hot.

As described above, in the above embodiment, the case 1 having the cylindrical portion 2 formed in a substantially cylindrical shape,
The cylinder 7 is coaxially inserted into the cylindrical portion 2, the heat absorbing fins 12 and the heat radiating fins 13 are disposed between the cylindrical portion 2 and the cylinder 7, and the regeneration is disposed between the two fins 12, 13. In a Stirling cycle engine having the unit 10, a substantially short cylindrical protective body 26 covering the outer periphery of the regenerator 10 is provided,
When the regenerator 10 is inserted into the cylindrical part 2 and sequentially incorporated,
Since the outer periphery of the regenerator 10 is protected by 26, the outer periphery of the regenerator 10 can be incorporated without being turned over.

Further, since the outer projection 24 is formed on the outer periphery of the distal end of the cylinder 7, the outer projection 24 is inserted to a position where the distal end of the outer projection 24 comes into contact with the heat absorbing fins 12.
Since the heat absorbing fins 12 do not come into contact with the end of the regenerator 10 due to 24, the end of the regenerator 10 is prevented from being crushed.

Further, since the O-ring 28 as a sealing member is provided on the outer peripheral side of the protective body 26, the O-ring 28 can be formed even if the inner surface of the cylindrical portion 2 of the case 1 is not strictly cylindrical. Since the gas seal 28 comes into contact with the inner surface of the case 1, the gas sealed in the Stirling cycle engine does not pass through any part other than the regenerator 10 when passing through the regenerator 10.

Further, since the inner protrusion 29 is formed on the inner periphery on the base end side of the protective body 26, the end of the regenerator 10 is prevented from being crushed.

Next, a second embodiment and a third embodiment will be described with reference to FIGS.
This will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the second embodiment, the regenerator 10 is mounted on the cylinder 7 via a bobbin 31. The bobbin 31 is formed in a cylindrical shape so that the cylinder 7 is fitted inside,
The axial length is at least the regenerator 10 and the radiation fin 13
Are formed so as to be equal to or greater than the axial length. An outer protrusion 32, which is a flange-like protrusion, is formed on the distal end side of the outer periphery of the bobbin 31, and a plurality of through holes 33 are formed in the outer protrusion 32 in the axial direction.

A short cylindrical protective body 26 having substantially the same length as the axial length of the regenerator 10 is attached to the outer periphery of the regenerator 10. O-rings 28 are attached near both ends of the protection body 26, and the O-rings 28 abut on the inner periphery of the cylindrical portion 2 of the case 1.

Next, the assembly of the regenerator 10 and the like will be described. First, heat absorbing fins 12 are inserted into the cylindrical portion 2 of the case 1,
Fix it. Next, the bobbin 31 is inserted into the inner periphery of the regenerator 10.
At this time, the regenerator 10 is attached such that the distal end side of the regenerator 10 is in contact with the base end side surface of the outer projection 32, and the regenerator 10 is positioned. Then, the protection body 26 is attached to the outer periphery of the regenerator 10, and further, the O-ring 28 is attached to the groove 27 of the protection body 26, and then the radiation fin 13 is attached to the base end side of the regenerator 10. Then, the regenerator 10, the protection body 26, the O-ring 28, and the bobbin 31 to which the heat radiation fins 13 are attached are inserted into the cylindrical portion 2 of the case 1, and the cylinder 7 is inserted into the inner periphery of the bobbin 31 and assembled. Things.

As described above, in the second embodiment, when the regenerator 10 is inserted into the cylindrical portion 2 and sequentially assembled, the outer periphery of the regenerator 10 is protected by the protector 26, so that the outer periphery of the regenerator 10 is Since the O-ring 28 serving as a seal member is provided on the outer peripheral side of the protective body 26 without being turned up, the gas sealed in the Stirling cycle engine passes through the regenerator 10 when the gas passes through the regenerator 10. It will not pass anywhere other than 10.

Further, a substantially cylindrical bobbin 31 is provided on the inner peripheral side of the regenerator 10, and the cylinder 7 can be inserted into the inner peripheral side of the bobbin 31, so that the bobbin 31 can be inserted.
31 is a regenerator 10, a protective body 26, an O-ring 28, and a radiation fin 13.
When the regenerator 10 is inserted into the cylindrical portion 2 of the case 1, the inner peripheral end of the regenerator 10 does not roll up due to contact with the outer surface of the cylinder 7, and the assembly can be performed satisfactorily.

Further, an outer protrusion 32 is provided on the outer end of the bobbin 31 so that the heat absorbing fins 12 do not come into contact with the end of the regenerator 10 so that the end of the regenerator 10 is crushed. Is prevented.

In the third embodiment, the regenerator 10 is mounted on the cylinder 7 via the bobbin 31.
At the tip of the outer periphery of the outer projection 32 is a flange-shaped projection
The protrusion 32 has a plurality of through holes 33 formed in the axial direction.

The regenerator 10 is formed by winding a film 10A having an uneven surface on the surface and processing it into a substantially short cylindrical shape. The inner diameter of the regenerator 10 which can be ventilated in the axial direction is substantially equal to the outer diameter of the bobbin 31. The outer diameter of the regenerator 10 is smaller than the inner diameter of the cylindrical portion 2 of the case 1. A short cylindrical protection body 26 having substantially the same length as the axial length of the regenerator 10 is attached to the outer periphery of the regenerator 10. O-rings 28 are attached near both ends of the protection body 26,
Reference numeral 28 contacts the inner periphery of the cylindrical portion 2 of the case 1. Further, an inner protrusion 29 is formed on the base end side of the inner periphery of the protection body 26, and a plurality of through holes 30 are formed in the inner protrusion 29 in the axial direction.

Next, the assembly of the regenerator 10 and the like will be described. First, heat absorbing fins 12 are inserted into the cylindrical portion 2 of the case 1,
Fix it. Next, the bobbin 31 is inserted into the inner periphery of the regenerator 10.
At this time, the regenerator 10 is attached such that the distal end side of the regenerator 10 is in contact with the base end side surface of the outer projection 32, and the regenerator 10 is positioned. Then, a protective body 26 is attached to the outer periphery of the regenerator 10, and an O-ring 28 is attached to the groove 27 of the protective body 26. At this time, the regenerator 10 is attached so that the proximal end side of the regenerator 10 abuts on the inner protrusion 29. Thereafter, the radiation fins 13 are attached to the base end side of the regenerator 10. Then, the bobbin 31 to which the regenerator 10, the protective body 26, the O-ring 28, and the radiation fin 13 are attached is attached to the case 1
And the cylinder 7 is inserted into the inner periphery of the bobbin 31 and assembled.

As described above, in the third embodiment, when the regenerator 10 is inserted into the cylindrical portion 2 and sequentially assembled, the outer periphery of the regenerator 10 is protected by the protector 26, so that the outer periphery of the regenerator 10 is Since the O-ring 28 serving as a seal member is provided on the outer peripheral side of the protective body 26 without being turned up, the gas sealed in the Stirling cycle engine passes through the regenerator 10 when the gas passes through the regenerator 10. It will not pass anywhere other than 10.

Further, a substantially cylindrical bobbin 31 is provided on the inner peripheral side of the regenerator 10, and the cylinder 7 can be inserted into the inner peripheral side of the bobbin 31.
31 is a regenerator 10, a protective body 26, an O-ring 28, and a radiation fin 13.
When the regenerator 10 is inserted into the cylindrical portion 2 of the case 1, the inner peripheral end of the regenerator 10 does not roll up due to contact with the outer surface of the cylinder 7, and the assembly can be performed satisfactorily.

Further, since the heat absorbing fins 12 do not come into contact with the ends of the regenerator 10 on the outer peripheral end of the bobbin 31 by the outer projections 32, the ends of the regenerator 10 are prevented from being crushed, and the inner projections are further reduced. Since the base end side of the regenerator 10 is abutted by 29, the radiation fins 13 are
Do not touch the end of 10.

It should be noted that the Stirling cycle engine of the present invention is not limited to the embodiment described above, and various modifications are possible. For example, the outer protrusion or the inner protrusion is not provided on the entire periphery of the peripheral surface like a flange, but may be provided on a part of the peripheral surface.

[0039]

According to a first aspect of the present invention, there is provided a Stirling cycle engine according to the present invention, comprising a case having a substantially cylindrical cylindrical portion, a cylinder coaxially inserted into the cylindrical portion of the case, and the cylindrical portion. And a heat absorbing member and a heat radiating member disposed between the cylinder and a regenerator disposed between these members, and provided with a substantially cylindrical protective body so as to cover at least the outer periphery of the regenerator. Yes, by covering at least the outer periphery of the regenerator with a protective body and inserting it into the case,
Since the regenerator is mounted in the case, the outer edge of the regenerator can be assembled without being turned up by being in contact with the inner surface of the case.

According to a second aspect of the present invention, in the Stirling cycle engine according to the first aspect, a substantially cylindrical bobbin is provided on an inner peripheral side of the regenerator, and the cylinder is provided on an inner peripheral side of the bobbin. It is configured to be insertable, a regenerator is attached to the outer periphery of the bobbin, the outer periphery of the regenerator is covered with a protective body, and the bobbin to which these regenerators and the protective body are attached is inserted into a case. By inserting the cylinder into the bobbin, the front end of the machine body can be assembled, so that the inner peripheral end of the regenerator can be assembled without being turned up by coming into contact with the outer surface of the cylinder.

Further, according to a third aspect of the present invention, in the Stirling cycle engine according to the first or second aspect, a projection is formed on an outer periphery of the cylinder or the bobbin.
The protrusion formed on the cylinder or bobbin positions the regenerator with respect to the cylinder or bobbin, and prevents the end of the regenerator from being crushed when the regenerator is inserted.

According to a fourth aspect of the present invention, in the Stirling cycle engine according to the first to third aspects, a seal member is provided on an outer peripheral side of the protective body, and the inner surface of the case is strictly cylindrical. Even if it is not formed, the seal member contacts the inner surface of the case and seals, so that the gas sealed in the Stirling cycle engine does not pass through places other than the regenerator when passing through the regenerator, The efficiency of the regenerator can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing an exploded state showing the first embodiment of the present invention.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is a sectional view around an outer protrusion showing a second embodiment of the present invention.

FIG. 5 is a sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Cylindrical part 7 Cylinder 10 Regenerator 12 Heat absorbing fin (heat absorbing member) 13 Heat radiating fin (heat radiating member) 24 32 Outer projection (projection) 26 Protector 31 Bobbin 28 O-ring (seal member)

Continuation of the front page (72) Inventor Takeshi Suzuki 2084 No. 2 for Kata, Nishiota, Yoshida-cho, Nishikanbara-gun, Niigata F-term in Twinbird Industry Co., Ltd. (Reference) 3J044 AA18 BA04 CC05 CC16 DA13

Claims (4)

[Claims] 1. A case having a substantially cylindrical cylindrical portion, a cylinder coaxially inserted into the cylindrical portion of the case, a heat absorbing member and a heat radiating member disposed between the cylindrical portion and the cylinder. And a regenerator disposed between the two members, and a substantially cylindrical protective body is provided so as to cover at least the outer periphery of the regenerator. 2. The Stirling device according to claim 1, wherein a substantially cylindrical bobbin is provided on an inner peripheral side of said regenerator, and said cylinder is insertable on an inner peripheral side of said bobbin. Cycle agency. 3. The Stirling cycle engine according to claim 1, wherein a projection is formed on an outer periphery of the cylinder or the bobbin. 4. The Stirling cycle engine according to claim 1, wherein a seal member is provided on an outer peripheral side of the protection body.