JPH112468A - Stirling refrigerating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To elongate the life, miniaturize the device and reduce the manufacturing cost of a Stirling refrigerating machine by reducing the vibration of the Stirling refrigerating machine, which is caused by the behavior of a leaf spring, supporting a compression piston and a displacer elastically. SOLUTION: The compression piston 4 of a compressor A and the displacer 22 of an expansion machine B are supported elastically by a first leaf spring 12. Second leaf springs 19, arranged at the back surface side of the first leaf springs 12, are moved in reverse to the movements of the first leaf springs 12 to cancel vibration in the direction of reciprocal operation of the compression piston 4 and the displacer 22. Scroll slits, reversed to each other, are formed on the first and second leaf springs 12, 19 to cancel vibration due to the torsional force of the first leaf spring 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Stirling refrigerator, and more particularly to an improvement in a leaf spring for elastically supporting a compression piston for compressing refrigerant gas and a displacer for expanding refrigerant gas.

[0002]

2. Description of the Related Art A Stirling refrigerating machine comprises a compressor for compressing a refrigerant gas and an expander for expanding a refrigerant gas discharged from the compressor. In the compressor, the refrigerant gas is reciprocated by a compression piston. On the other hand, in the expander, the refrigerant gas compressed by the compressor is expanded by the reciprocating movement of the displacer to generate cryogenic cooling.

As such a Stirling refrigerator, for example, as disclosed in Japanese Patent Application Laid-Open No. Hei 4-263751, in a compressor, two compression pistons are arranged opposite to each other in a cylinder and a compression chamber is provided between the two compression pistons. Constitute
There is known a Stirling refrigerating machine in which refrigerant gas is compressed in a compression chamber by synchronized movement of both compression pistons.

In this compressor of the Stirling refrigerator, a leaf spring composed of a disk having a spiral slit is arranged on the back side of each compression piston, and the base end of a rod connected to each compression piston is set to the above-mentioned position. Fit to the center of the leaf spring,
Each compression piston is elastically supported by each leaf spring so as to be able to reciprocate.

[0005] Each of the leaf springs has a high radial rigidity due to its spiral slit shape. Therefore, radial vibration of each compression piston is reduced to reduce vibration of each compression piston. To achieve the goal.

In the leaf spring which elastically supports the two compression pistons, the spirals of the spiral slits are formed in opposite directions, and are generated in each leaf spring when both compression pistons reciprocate synchronously. The torsional forces are canceled out to reduce the vibration caused by the torsional force.

Further, the pair of leaf springs move in opposite directions due to the synchronized movement of the two compression pistons, so that the vibrations of the respective compression pistons in the reciprocating movement direction are also canceled out.

[0008]

In the Stirling refrigerator, there is a compressor in which one compression piston is disposed in a cylinder. In this single-piston type compressor, only one compression piston is required. ,
As compared with the double piston type compressor as described above, there is an advantage that the entire device can be reduced in size and can be manufactured at low cost.

However, in this single-piston type compressor, the lateral displacement of the compression piston in the radial direction can be reduced by simply elastically supporting the compression piston by a leaf spring, but the reciprocating movement of the compression piston is reduced. There is no means to counteract the vibration in the direction and the torsional force generated in the leaf spring when the compression piston reciprocates, which makes it impossible to sufficiently reduce the vibration of the compression piston. The service life may be shortened. Note that this is not limited to the compressor, and the same can be said for the expander.

The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the vibration of a Stirling refrigerator caused by the behavior of a leaf spring which elastically supports a compression piston and a displacer to extend the life of the refrigerator. Another object of the present invention is to reduce the manufacturing cost while reducing the size of the entire apparatus.

[0011]

In order to achieve the above-mentioned object, according to the present invention, another leaf spring which operates in reverse to the leaf spring is disposed on the back side of the leaf spring which elastically supports the compression piston and the displacer. It is characterized by the following.

More specifically, as shown in FIG. 1, the present invention relates to a compressor (A) for compressing refrigerant gas and an expander (B) for expanding refrigerant gas discharged from the compressor (A). ), And at least one of the compressor (A) and the expander (B) is provided with one reciprocating body (4, 22) that compresses or expands the refrigerant gas by reciprocating movement. The following solution was taken for a Stirling refrigerating machine that is elastically supported in (1).

That is, a first solution of the present invention is to dispose a second leaf spring (19) on the back side of the first leaf spring (12), and attach the second leaf spring (19) to the first leaf spring (19). Spring (12)
, The vibration of the reciprocating body (4, 22) in the reciprocating direction is canceled. Further, a reverse torsion force generating means is provided on the second leaf spring (19), and the reverse torsion force generating means applies a torsional force in a direction opposite to the torsional force of the first leaf spring (12) to the second leaf spring (19). 19), wherein the vibration caused by the torsional force of the first leaf spring (12) is canceled.

With the above arrangement, in the first solution of the present invention, when the reciprocating body (4, 22) reciprocates in at least one of the compressor (A) and the expander (B), the reciprocating movement Following the movement of the body (4, 22)
The leaf spring (12) moves. At this time, on the back side, the second leaf spring (19) moves in a direction opposite to the movement of the first leaf spring (12), and the vibration of the reciprocating body (4, 22) in the reciprocating direction is canceled. At the same time, a reverse torsional force is generated in the second leaf spring (19) by the reverse torsional force generating means with respect to the torsional force of the first leaf spring (12).
The vibration caused by the torsional force of the Stirling refrigerator is canceled out, so that the vibration of the Stirling refrigerator caused by the behavior of the leaf spring is reduced, and the life thereof is prolonged. In addition, this Stirling refrigerator is a single type having one reciprocating body (4, 22), so that the whole apparatus is small and the production cost is not so high.

According to a second aspect of the present invention, in the first aspect, the reverse torsion force generating means is provided as shown in FIG.
As shown in (b), a spiral slit (20) formed opposite to the spiral slit (16) formed in the first leaf spring (12) is employed.

With the above configuration, in the second solution of the present invention, the above-described operation and effect can be easily realized only by changing the spiral shape of the spiral slit (20) of the second leaf spring (19).

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view of a Stirling refrigerator according to an embodiment of the present invention. In the figure, (A) is a compressor for compressing the refrigerant gas, (B) is an expander for expanding the refrigerant gas discharged from the compressor (A), and the compressor (A) and the expander (B ) Both have closed cylindrical casings (1) and (2).

The compressor (A) is of a single piston type, and a cylindrical cylinder (3) is concentrically fixed to the inner surface of one of the side walls in a casing (1). A compression piston (4) as one reciprocating body is slidably disposed inside 3) so as to be reciprocally movable, and the compression piston (4) is used to move the cylinder (3).
A compression chamber (5) is formed therein. One end of a rod (6) is connected to the back surface of the compression piston (4) such that one end of the rod (6) is located at the center line of the casing (1), and the other end of the rod (6) is connected to the other side wall of the casing (1). Extending towards.

A first linear motor (7) is arranged around the rod (6). The first linear motor (7) includes an annular yoke (8) made of pure iron fixed to the inner peripheral surface of the peripheral wall of the casing (1), and a through hole is provided at the center of the yoke (8). (8a) is formed,
The rod (6) is inserted through the through hole (8a) from one end and protrudes to the other end. The yoke (8)
The ring-shaped permanent magnet (9) is fixed to the outer peripheral surface of the concave portion (8b), and the yoke (8) is fixed by the permanent magnet (9). )
Is used as a yoke to generate a magnetic field of a predetermined strength in the concave portion (8b). Further, the rod (6)
Is connected to a bottomed cylindrical bobbin (11) having an electromagnetic coil (10) wound around the outer peripheral surface thereof, and the electromagnetic coil (10) is inserted into the recessed portion (8b) to be permanent. It faces the magnet (9). And the electromagnetic coil (10)
The compression piston (4) is reciprocated at a cycle determined by a spring constant of a first leaf spring (12) to be described later by applying an alternating current of a predetermined frequency to the compression chamber (5). It is configured to generate pressure.

A pair of disc-shaped first leaf springs (12) are provided at two locations on the rod (6) near the compression piston (4) and at the protruding end thereof. The rod (6) is fitted into the fitting hole (13a) of the thin plate (13) to be fixed, and the first linear motor (7) is fixed so as to sandwich the first linear motor (7) from both sides. Is fixed to the inner peripheral wall of the casing (1). Each of the first leaf springs (12) is formed by stacking three thin plates (13),
A spacer (14) is interposed between adjacent thin plates (13),
The center part and the outer peripheral part have two ring-shaped holding plates (1).
5), each of the first leaf springs (1) is sandwiched from both sides and assembled. As shown in FIG.
At the center of the three thin plates (13) constituting 2), a fitting hole (13a) for fitting the rod (6) is formed, and around the three thin plates (13), there are three swirling clockwise. Spiral slits (16) are formed at substantially equal intervals in the circumferential direction, and circular holes (16a) are formed at both ends of each spiral slit (16) to reduce stress concentration.

As described above, by forming the spiral slit (16) in each thin plate (13), each first leaf spring (1) is formed.
2) is such that the rigidity in the radial direction is high and there is almost no deformation in that direction, while the deformation in the central axis direction at the center of each of the first leaf springs (12) becomes large.
The compression piston (4) is elastically supported so as to be capable of reciprocating in the horizontal direction and immovable in a direction orthogonal to the reciprocating movement direction of the compression piston (4). Compression piston (4)
To achieve low vibration.

On the back side of the first linear motor (7), another second linear motor (17) is arranged. Since the second linear motor (17) has the same configuration as the first linear motor (7), the same components are denoted by the same reference numerals, and detailed description thereof will be omitted. In the first linear motor (7), the bobbin (11) is fixed to the rod (6) of the compression piston (4).
The linear motor (17) is fixed to another rod (18).

One of the features of the present invention is that a pair of disc-shaped second leaf springs (19) is inserted into the center holes of the rod (18) at both ends of the rod (18). The second linear motor (17) is fixed so as to sandwich the second linear motor (17) from both sides.
Is fixed to the inner peripheral wall of the. Each of the second leaf springs (19)
Also, as with the first leaf springs (12), three thin plates (1
3) are overlapped, a spacer (14) is interposed between adjacent thin plates (13), and a central portion and an outer peripheral portion thereof are sandwiched by two ring-shaped pressing plates (15) from both sides. As shown in FIG. 2B, three thin plates (1) constituting each second leaf spring (19) are assembled.
3) has a fitting hole (13a) into which the rod (18) is fitted.
Are formed, and three spiral slits (2) spiraling counterclockwise in the opposite direction to the spiral slits (16) formed in each first leaf spring (12).
0) are formed at substantially equal intervals in the circumferential direction, and both ends of each spiral slit (20) are circular holes (2) in order to reduce stress concentration.
0a) is formed.

The second linear motor (17)
Is driven in a phase opposite to that of the first linear motor (7) to move each second leaf spring (19) in the opposite direction to the movement of each first leaf spring (12), thereby reducing the compression piston (4). Vibration in the reciprocating direction is canceled. That is,
The second leaf spring (19) serves as a balancer. At this time, the first and second leaf springs (12),
Since the spiral slits (16) and (20) of (19) have opposite spiral directions, the second leaf springs (19) are subjected to the torsional force of the first leaf springs (12). On the other hand, a reverse torsional force is generated, thereby canceling the vibration caused by the torsional force of each first leaf spring (12). Therefore, the spiral slit (2) of each second leaf spring (19)
0) constitutes a reverse torsional force generating means.

On the other hand, the expander (B) is also of a single type, and a cylindrical cylinder (21) is concentrically fixed to the outer surface of one of the side walls in the casing (2). A displacer (22) as a single reciprocating body is slidably disposed in the reciprocating movable body in the reciprocating body. The displacer (22) moves the expansion chamber (23) and the working chamber (24) in the cylinder (21). And divided into The displacer (22) is filled with a metal cold storage material (regenerative heat exchanger).
The space filled with the cold storage material is communicated with the expansion chamber (23) and the working chamber (24), respectively. And
The low-temperature refrigerant gas expanded in the expansion chamber (23) is supplied to the working chamber (2).
When the refrigerant gas is directed to 4), the regenerator material is cooled by the refrigerant gas to store cold heat in the regenerator material. Conversely, when the refrigerant gas at room temperature travels from the working chamber (24) to the expansion chamber (23), the regenerator material becomes This cools the refrigerant gas. A cold head (25) is provided at the tip of the cylinder (21).

The working chamber (24) in the cylinder (21)
Is connected to the compression chamber (5) of the compressor (A) by a pipe (26), and reciprocates the displacer (22) by the refrigerant gas pressure from the compressor (A) to transfer the refrigerant gas to the expansion chamber (5). The cold head (25) is made to generate cold by expanding it in (23).

The mechanism for operating the displacer (22) includes first and second linear motors (7), (17) installed in a casing (2) as in the case of the compressor (A). First and second leaf springs (12), (1
9) and the like, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted. Of course, the three thin plates (13) constituting each of the first leaf spring (12) and the second leaf spring (19) on the expander (B) side also have
The spiral slit (1) formed in each first leaf spring (12)
6), three spiral slits (20) spiraling counterclockwise in the opposite direction are formed at substantially equal intervals in the circumferential direction, and both ends of each spiral slit (20) are circular holes () for reducing stress concentration. 20a) are formed.

The operation of the above-structured Stirling refrigerator will be described. First, when starting operation of the refrigerator, alternating currents of a predetermined frequency are applied to the respective electromagnetic coils (10) of the first and second linear motors (7) and (17) on the compressor (A) side in opposite phases. So as to energize.
With this energization, the compression piston (4) becomes a permanent magnet (9).
Reciprocating from the neutral position while elastically deforming the center of the first leaf spring (12) in the left-right direction by the magnetic field generated by the compression piston, and the reciprocating movement of the compression piston (4) increases or decreases the volume of the compression chamber (5). And a pressure wave having a predetermined period is generated in the compression chamber (5).

At this time, the second leaf spring (19) moves in the opposite direction to the first leaf spring (12), and the first and second leaf springs (19) move.
By the leaf springs (12) and (19) moving in opposite directions,
Vibration in the reciprocating direction of the compression piston (4) can be canceled.

Further, since the spiral shapes of the spiral slit (16) of the first leaf spring (12) and the spiral slit (20) of the second leaf spring (19) spiral in opposite directions to each other, the first plate spring is formed. A torsional force opposite to the torsional force of the spring (12) is generated in the second leaf spring (19), and the first leaf spring (12).
The vibration caused by the torsional force of the first plate spring (12) can be canceled out, whereby the vibration of the Stirling refrigerator caused by the behavior of the first leaf spring (12) can be reduced and the life thereof can be extended.

Also, since the spiral of the spiral slit (20) of the second leaf spring (19) only needs to be formed in the direction opposite to that of the first leaf spring (12), the means for generating reverse torsional force can be simplified. Can be configured.

In addition, the Stirling refrigerator is of a single type having one compression piston (4) and one displacer (22).
The entire device can be reduced in size as compared with a certain double type device, and can be manufactured at low cost.

When a pressure wave of a predetermined cycle is generated in the compression chamber (5) as described above, the pressurized refrigerant gas is supplied to the working chamber (24) of the expander (B) via the pipe (26). . Also on the side of the expander (B), alternating currents of a predetermined frequency are supplied to the respective electromagnetic coils (10) of the first and second linear motors (7) and (17) so as to have opposite phases. The displacer (22) is moved toward the distal end of the cylinder (21) by deforming the center of the first leaf spring (12) on the expander (B) side to the left by the first linear motor (7). Thus, the gas in the working chamber (24) flows into the expansion chamber (23) while passing through the inside of the displacer (22) while being cooled by the regenerator material, and the displacer (2)
2) is caused by the restoring force of the first leaf spring (12).
1) Move to the base end side and return to the original position.

On the other hand, the compression piston (4) of the compressor (A)
When the pressure in the compression chamber (5) decreases due to the retreat, the refrigerant gas in the working chamber (24) of the expander (B) passes through the pipe (26).
After returning to the compression chamber (5) of the compressor (A), the pressure in the working chamber (24) becomes lower than that in the expansion chamber (23). The displacer (2) is driven by a first linear motor (7).
2) moves to the base end side of the cylinder (21) while deforming the center of the first leaf spring (12) of the expander (B) rightward, and the refrigerant gas in the expansion chamber (23) expands adiabatically. Then cold occurs. Then, the gas after expansion is supplied to the expansion chamber (2).
From 3), it flows through the displacer (22) to the working chamber (24) while applying cold to the regenerator material, and the displacer (2)
2) is caused by the restoring force of the first leaf spring (12).
1) Move to the base end side and return to the original position.

One cycle is completed as described above, and thereafter, by repeating the same cycle, the cold head (25) at the tip of the cylinder (21) is gradually cooled to the extremely low temperature level.

Also on the side of the expander (B), the reciprocal movement of the displacer (22) can be canceled out by the first and second leaf springs (12) and (19) operating in opposite directions. With the first and second leaf springs (1
2) and (19), the spiral slits (1
6) and (20), the torsional force of the first leaf spring (12) is canceled out by the torsional force of the first leaf spring (12) in the opposite direction, and the single-type spring caused by the behavior of the first leaf spring (12). As with the compressor (A), the vibration of the Stirling refrigerator can be reduced to extend the life thereof, and the entire apparatus can be reduced in size and cost.

In this embodiment, the compressor (A)
Compression piston (4) in both the compressor and the expander (B)
And a second leaf spring (19) that elastically supports the displacer (22) on the first leaf spring (12) and cancels the vibration of the compression piston (4) and the displacer (22) in the reciprocating movement direction on the back side. And a first leaf spring (1
The vibration caused by the torsional force of 2) is transmitted to the spiral slit (1).
Although the counterpart is canceled by the spiral slit (20) of the second leaf spring (19) which is set in the opposite direction to that of (6), the present invention is not limited to this, and only one of the sides may be configured as described above.

[0039]

As described above, according to the present invention,
One reciprocating body (4, 21) is elastically supported by a first leaf spring (12), and a second leaf spring (19) is arranged on the back side of the first and second leaf springs (12). Can be moved in opposite directions to cancel the vibration of the reciprocating moving body (4, 22) in the reciprocating movement direction, and further, the second leaf spring (19) has a reverse torsional force generating means (2).
0) is provided to cancel the vibration caused by the torsional force of the first leaf spring (12), so that the life of the Stirling refrigerator due to the behavior of the leaf spring is reduced by reducing the vibration, and the size of the apparatus is reduced. It is possible to achieve both a reduction in manufacturing costs and a reduction in manufacturing costs.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a Stirling refrigerator according to an embodiment of the present invention.

2A is a plan view of a first leaf spring, and FIG. 2B is a plan view of a second leaf spring.

[Explanation of symbols]

 (A) Compressor (B) Expander (4) Compression piston (reciprocating body) (12) First leaf spring (16) Spiral slit (19) Second leaf spring (20) Spiral slit (reverse torsional force generating means) (22) Displacer (reciprocating body)

Claims (2)

[Claims] 1. A compressor (A) for compressing a refrigerant gas, and an expander (B) for expanding a refrigerant gas discharged from the compressor (A), wherein the compressor (A) and the expander At least one of (B) is a Stirling refrigerator in which one reciprocating body (4, 22) for compressing or expanding the refrigerant gas by reciprocating movement is elastically supported by the first leaf spring (12). On the back side of the first leaf spring (12), the vibration in the reciprocating direction of the reciprocating body (4, 22) is generated by moving in the opposite direction to the movement of the first leaf spring (12). A second leaf spring (19) for canceling is disposed, and the second leaf spring (19) is provided with the first leaf spring (12).
A reverse torsional force generating means for generating a torsional force in a direction opposite to the torsional force of the second leaf spring (19) to cancel vibrations caused by the torsional force of the first leaf spring (12). Characteristic Stirling refrigerator. 2. The Stirling refrigerator according to claim 1, wherein the reverse torsional force generating means includes a spiral slit (20) formed in a direction opposite to a spiral slit (16) formed in the first leaf spring (12). A) a Stirling refrigerator.