JPH116660A - Reciprocating movement-type refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the degree of the freedom of design and at the same time to reduce the deflection of a movable body by offsetting the position of the center of the gravity of the movable body to a position that is near an elastic support means that is one of a pair of elastic support means and is located at a side far from the piston. SOLUTION: A position G1 of the center of the gravity of the movable body 22 is offset to a position that is near an elastic support means 3b that is one of a pair of elastic support means 3a and 3b and is located at a side being away from a piston 9. Each load operating on each of the elastic support means 3a and 3b becomes larger in the elastic support means 3b than the elastic support means 3a being located near the piston 9. Therefore, when the movable body 22 is reciprocated in a horizontal direction, the amount of the deflection of up and down directions of the movable body 22 with the reciprocating movement becomes smaller at a side that is near the piston 9 than one that is far from the piston 9, thus fully reducing the deflection of the movable body 22 in a site where the piston 9 is provided without excessively increasing the support stiffness of the elastic support means 3a and 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of a reciprocating refrigerator having a reciprocating movable body for compressing or expanding gas in a compressor or an expander.

[0002]

2. Description of the Related Art Generally, a reciprocating refrigerating machine of this type includes an expander for generating cryogenic-level cold by reciprocating a displacer, and a compressor for compressing a refrigerant supplied to the expander. Stirling refrigerators and the like are well known. This Stirling refrigerator is configured such that a displacer that defines an expansion chamber in a cylinder of the expander and a piston that defines a compression chamber in a cylinder of the compressor reciprocate in each cylinder. In this refrigerator, in order to reduce the wear of the displacer and the piston and extend the life of the refrigerator, it is required that the displacement of the displacer and the piston in the direction perpendicular to the reciprocating direction be as small as possible.

Therefore, conventionally, for example, Japanese Unexamined Patent Publication No.
As shown in Japanese Patent Publication No. 51, in a compressor, one piston can reciprocate in a substantially horizontal direction (piston axial direction) and cannot move in a direction perpendicular to the reciprocating direction of the piston (piston radial direction). It is known to use a leaf spring that elastically supports the piston to reduce the deflection in the direction perpendicular to the reciprocating direction of the piston.
In other words, this leaf spring has high rigidity in the radial direction of the piston and hardly deforms in the radial direction, so that the radial displacement of the piston is reduced. The movable body is elastically supported so as to reciprocate in the axial direction of the piston.

[0004] When the above-mentioned leaf spring is used, usually, in order to effectively reduce the deflection of a movable body having a piston or the like, the leaf spring is arranged at two places separated in the horizontal direction of the movable body. The movable body is elastically supported. Further, a large number of leaf springs are disposed at each of the two places, or a leaf spring having a large spring constant is used, so that the rigidity of the movable body supported by the leaf springs is further increased. Attempts have been made to further reduce blur.

[0005]

However, when the supporting rigidity is increased by using a large number of leaf springs or leaf springs having a large spring constant as described above, it is possible to sufficiently reduce the deflection of the movable body. However, on the other hand, the horizontal movement of the movable body is considerably restricted.
As a result, for example, the stroke of the reciprocating motion of the piston in the compressor, the cycle of the reciprocating motion, and the like are limited to a narrow range, and the degree of freedom in design of the reciprocating refrigerator is reduced.

The present invention has been made in view of such a point, and an object thereof is to elastically reciprocate a movable body in a substantially horizontal direction by a leaf spring which is divided into two places as described above. In a reciprocating refrigerating machine that is supported, by devising the position of the center of gravity of the movable body and the setting of the support rigidity by the leaf spring, it is possible to secure the freedom of design and reduce the freezing of the movable body The purpose is to extend the life of the machine.

[0007]

In order to achieve the above object, according to the present invention, the position of the center of gravity of the movable member is offset or the supporting rigidity of the two leaf springs is different from each other. By doing so, the deflection of the movable body at the portion where the piston and the displacer are provided is reduced without excessively increasing the support rigidity of the leaf spring.

[0008] Specifically, the invention described in claim 1 corresponds to FIG.
As shown in (1), a movable body (22) having a piston (9) at its distal end defining a compression chamber (11) or an expansion chamber in a cylinder (5) is disposed at two locations horizontally separated from each other. At least one or more leaf springs (31) are provided so as to elastically support the movable body (22) reciprocally in a substantially horizontal direction and immovably in a direction perpendicular to the reciprocating direction of the movable body (22). ) And a pair of elastic support means (3a) and (3b), and the gas in the compression chamber (11) is compressed or the gas in the expansion chamber is expanded by the reciprocating motion of the movable body (22). The reciprocating refrigerating machine thus configured is targeted. Then, the position of the center of gravity of the movable body (22) (G1
) Is offset between the two elastic support means (3a) and (3b) and toward the elastic support means (3b) farther from the piston (9).

According to the above arrangement, the position of the center of gravity (G1) of the movable body (22) is adjusted by the pair of elastic support means (3a) and (3).
b), the load acting on each of the elastic support means (3a) and (3b) is offset toward the elastic support means (3b) farther from the piston (9). ), The elastic support means (3
It becomes large in the elastic support means (3b) on the side farther than a). For this reason, when the movable body (22) is reciprocated in the horizontal direction, the amount of vertical movement of the movable body (22) due to the reciprocation is greater on the side closer to the piston (9) than on the far side. Become smaller. That is, the amount of movement of the movable body (22) on the side where the piston (9) is provided can be made smaller than the entire amount of movement of the movable body (22). This makes it possible to sufficiently reduce the displacement of the movable body at the portion where the piston (9) is provided, without excessively increasing the support rigidity of the elastic support means (3a) and (3b).

According to a second aspect of the present invention, as shown in FIG. 1, a movable body (2) having a piston (9) at its tip end for defining a compression chamber (11) or an expansion chamber in a cylinder (5).
2) and two positions which are horizontally separated from each other so that the movable body (22) can reciprocate substantially in the horizontal direction and cannot move in the direction perpendicular to the reciprocating direction of the movable body (22). A pair of elastic support means (3a) constituted by at least one or more leaf springs (31) so as to elastically support them.
(3b), wherein the reciprocating refrigerator is configured to compress the gas in the compression chamber (11) or expand the gas in the expansion chamber by reciprocating the movable body (22). The elastic support means (3) on the side close to the piston (9)
The support rigidity in the direction perpendicular to the reciprocating direction of the movable body (22) according to a) is set to be larger than that of the elastic support means (3b) on the far side.

According to the above construction, the support rigidity of the elastic support means (3a) closer to the piston (9) of the pair of elastic support means (3a) and (3b) is increased. (3b), when the movable body (22) is reciprocated in the horizontal direction, the amount of vertical movement of the movable body (22) due to the reciprocation is determined by the piston (9). ) Is smaller on the side closer to) than on the far side. Thus, the elastic support means (3)
It is possible to sufficiently reduce the displacement of the movable body at the portion where the piston (9) is provided, without excessively increasing the support rigidity of (a) and (3b).

According to a third aspect of the present invention, as shown in FIG. 1, each elastic support means (3
a) and (3b) are each constituted by a leaf spring (31) having the same spring constant, and the number of leaf springs of the elastic support means (3a) closer to the piston (9) is further increased. More than means (3b).

Thus, the configuration of each of the elastic support means (3a) and (3b) in the second aspect of the present invention is specifically specified. That is, since the number of leaf springs (31) of the elastic support means (3a) closer to the piston (9) is larger than that of the elastic support means (3b) on the far side, the elasticity of the elastic support means (3b) closer to the piston (9) is higher. The support rigidity of the support means (3a) is set to be certainly larger than that of the elastic support means (3b) on the far side. Further, since the spring constants of all the leaf springs (31) are equal, the setting of the support rigidity becomes easy.

According to a fourth aspect of the present invention, each elastic supporting means in the second aspect of the present invention is constituted by the same number of leaf springs having different spring constants, and the elastic supporting means on the side close to the piston is provided. The spring constant of the leaf spring is made larger than that of the elastic support means on the far side.

In the case of the above configuration, the configuration of each elastic support means in the second aspect of the invention, which is different from that of the third aspect, is specifically specified. That is, since the spring constant of the leaf spring of the elastic support means closer to the piston is larger than that of the elastic support means on the far side, the support rigidity of the elastic support means closer to the piston is more reliable than the elastic support means on the far side. Is set higher. Further, since the number of the leaf springs of the two elastic support means is equal, the setting of the support rigidity becomes easy.

The invention according to claim 5 is the invention according to claims 1, 2, and 3
Alternatively, in the reciprocating refrigerator described in 4, the piston (9) defines the compression chamber (11) in the cylinder (5) of the compressor (100) as shown in FIG.

Generally, radial displacement of the piston (9) of the compressor (100) is a major cause of wear of the piston, and it is required that the displacement be as small as possible. Therefore, according to the invention described in claim 5, the invention described in claim 1, 2, 3, or 4 can be effectively used.

The invention according to claim 6 is the invention according to claims 1, 2, 3
Alternatively, in the reciprocating refrigerator described in 4, the piston is a displacer (40) that defines an expansion chamber (36) in a cylinder (35) in the expander (200), as shown in FIG. By doing so, claim 5
The same operation and effect as those of the described invention can be obtained.

[0019]

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

FIG. 1 schematically shows a Stirling refrigerator as a reciprocating refrigerator according to an embodiment of the present invention. The refrigerator comprises a compressor (100) for compressing refrigerant gas,
This is a combination with an expander (200) for expanding the refrigerant gas discharged from the compressor (100).

The compressor (100) has a closed cylindrical casing (1) extending in the left-right direction (horizontal direction) in the figure, and the casing (1) includes a cylindrical wall portion (1a) and a cylindrical wall portion (1a). Disc wall portions (1b) and (1b) for hermetically closing the openings at both ends of the portion (1a). A cylindrical cylinder (5) having both ends opened and extending in the left-right direction is mounted and fixed concentrically to the cylindrical wall (1a) on the left disk wall (1b) of the casing (1).

A cylindrical piston (9) is slidably fitted in the cylinder (5), and the piston (9) defines a compression chamber (11) in the cylinder (5). ing. The compression chamber (11) is provided substantially at the center of the left disk wall (1b) in the casing (1).
A through hole (13) communicating with the through hole (1) is formed.
One end of the connecting pipe (14) is connected to 3).

The piston (9) is provided in the casing (1).
The piston (9) is drivingly connected to a linear motor (16) as a driving source for reciprocatingly driving the piston (9) in the left-right direction via a support shaft (15) extending in the left-right direction concentrically with the cylindrical wall portion (1a). . That is, the linear motor (16)
Is a cylindrical yoke (17) made of pure iron fixed to the inner peripheral surface of the cylindrical wall (1a) of the casing (1).
An annular permanent magnet (18) is fixed to the outer peripheral side surface in the ring-shaped recess (17a) provided on the right end surface of the yoke (17). The yoke (17) made of iron is used as a yoke to generate a magnetic field of a predetermined strength in the recess (17a).

A cylindrical bobbin (19) having a bottom is integrally connected to the right end side of the support shaft (15), and the cylindrical portion (19a) of the bobbin (19) has the concave portion (17a).
It is arranged so as to be able to reciprocate in the left-right direction. An electromagnetic coil (20) is wound around the outer peripheral surface of the cylindrical portion (19a) of the bobbin (19) at a position facing the magnet (18). The electromagnetic coil (2) of this linear motor (16)
By passing an alternating current of a predetermined frequency through 0), the piston (9) is caused to move at a period determined by the spring constant of the leaf springs (31), (31),... In the elastic support means (3a), (3b) described later. It is configured to reciprocate to generate a gas pressure of a predetermined cycle in the compression chamber (11). Thus, the piston (9), the support shaft (15), and the bobbin (1)
9) and the electromagnetic coil (20) are integrally reciprocated in the compressor (100) substantially horizontally in the compressor (100).
Of the movable body (22).

At the left and right ends of the support shaft (15), that is, at two places horizontally separated by the linear motor (16), four and three substantially disc-shaped leaf springs (31) are provided, respectively. ), (31), ... are arranged and fixed to form a pair of elastic support means (3a, 3b). Each of the leaf springs (31) is also fixed to the inner peripheral surface of the cylindrical wall (1a) of the casing (1) at the outer peripheral portion.
Further, as shown in FIG.
.. Are formed at substantially equal intervals in the circumferential direction. Thus, each of the leaf springs (31) has high rigidity in the radial direction of each of the leaf springs (31) and hardly deforms in the radial direction. The movable body (22) is elastically supported so as to be able to reciprocate substantially horizontally and immovably in a direction perpendicular to the reciprocating direction of the movable body (22). It has become. In addition, each slit hole (3
Both end portions of 1a) are circular in order to reduce stress concentration. In FIG. 2, (31b) is
A through hole for fitting and fixing to the support shaft (15).

Further, a balance weight (62) is provided at the right end of the support shaft (15), and the balance weight (62) is a movable body (22) of the compressor (100).
Is part of. The above balance weight (62)
Is a pair of elastic support means (3) for elastically supporting the position of the center of gravity (G1) of the movable body (22).
This is for offsetting to the right of the center position (H1) of a) and (3b). Each of these elastic support means (3
a), (3b), leaf springs (31), (31),
And the position of the center of gravity (22) of the movable body (22) are set to predetermined values as described later so as to reduce the movement of the movable body (22) at a portion where the piston (9) is provided. ing.

The position of the center of gravity (G1) of the movable body (22) and the elastic support means (3) which are characteristic parts of the present invention will be described below.
The setting of the number of leaf springs (31) in (a) and (3b) will be described with reference to FIG.

FIG. 3 is a schematic diagram showing a support structure for the movable body (22). In FIG.
Is located at the position of the center of gravity (G) by a pair of elastic support means (3a) and (3b) arranged at two places separated from each other in the horizontal direction.
It is elastically supported against gravity (Fg) acting on 1). The movable body (22) reciprocated in a substantially horizontal direction by the linear motor (16) has a maximum vertical displacement (Tip Deflection) at a tip (Tip) corresponding to a position where the piston (9) is disposed. Is obtained by the following equations (1) and (2). That is, Tip Deflection = {(E / D) [1-C (A / B) / (DC)] + 1} (1-C / D) (Fg / A) Equation (1) A = N1 × kr , B = N2 × kr ... Equation (2) where A, B: the supporting rigidity of the left and right elastic support means kr: the spring constant of the leaf spring N1, N2: the number of leaf springs C: the center of gravity from the left elastic support means Distance to position D: Distance between elastic support means E: Distance from left elastic support means to tip F: Weight of movable body g: Gravitational acceleration Here, weight (F) of movable body (22), plate The spring constant (kr) of the spring, the distance (D) between the elastic support means (3a, 3b), and the distance (E) from the left elastic support means (3a) to the tip (Tip) are set to actual values. And the left and right elastic support means (3a), (3b)
When the number (N1) and (N2) of leaf springs and the distance (C) from the left elastic support means (3a) to the center of gravity (G1) are variously changed.
Is calculated based on the above equations (1) and (2).

Specifically, F = 0.35 kg, kr = 100 N / m
After setting m and D = 70 mm, the maximum displacement of the tip (left end in FIG. 1) of the piston (9) in the compressor (100) may be set to E = 30 mm. In this case, the maximum displacement of the tip of the piston (9) is obtained as shown in Table 1. Further, in order to obtain the maximum shake amount of the base end (the right end in FIG. 1) of the piston (9), E = 20 mm may be set.
The maximum displacement of the base end of the piston (9) is obtained as shown in Table 2.

In Tables 1 and 2 below, the downward blur amount of the tip portion (Tip) is a positive value and the upward blur amount is a negative value. In addition, the rightmost column of Table 1 shows that when the amount of blur at the tip (Tip) becomes zero,
The distance (C) from the left elastic support means (3a) to the position of the center of gravity (G1) is shown, and is calculated based on the above equations (1) and (2).

[0031]

[Table 1] Deflection amount of piston tip (unit: micron)

[0032]

[Table 2] Deflection amount of piston base end (unit: microns)

Then, the position of the center of gravity of the movable body (22) (G1
) And the number of leaf springs (31) are set based on Tables 1 and 2 so that both the tip and base of the piston (9) have a displacement of 1 micron or less. That is, the position of the center of gravity (G1) of the movable body (22) is set to the center position (H1) of the pair of left and right elastic support means (3a) and (3b).
) (C = 35 mm) is offset to the right, and the support rigidity of the left elastic support means (3a) is set to be larger than that of the right elastic support means (3b). Accordingly, when the movable body (22) is reciprocated in the horizontal direction, the amount of vertical movement of the movable body (22) caused by the reciprocation is reduced by the left side of the movable body (22) (the piston (9) ) Can be made relatively small on both sides, and the displacement of both the distal end and the proximal end of the piston (9) can be reduced to 1 micron or less without excessively increasing the support rigidity. it can.

Specifically, in the compressor (100), N1 = 4, N2 = 3, and C = 50 mm. In this case, the amount of displacement of the tip of the piston becomes zero, and The displacement of the piston proximal end is 0.82 microns. Here, suppose that the number of leaf springs (31) is set to N1 = 4 and N2 = 3 similarly to the compressor (100), while the center of gravity (G1) of the movable body (22) is set to the center position (H).
If it is set to 1), from Tables 1 and 2, the amount of displacement at the piston tip is 3.68 microns and the amount of displacement at the piston proximal end is 3.88 microns. Also, while the position of the center of gravity (G1) of the movable body (22) is set (c = 50 mm) in the same manner as the compressor (100), the number of leaf springs (31) is the same as N1 = 4 and N2 = 4. According to Tables 1 and 2, the displacement of the piston tip is 0.88 microns, but the displacement of the piston base is 1.40 microns. That is, in the compressor (100), the offset setting of the center of gravity (G1) of the movable body (22) and the elastic support means (3
By setting the support stiffness according to (a) and (3b), the displacement of the distal end and the proximal end of the piston (9) is reduced to 1 micron or less.

On the other hand, the expander (200) (see FIG. 1)
Has a cylindrical cylinder (35), and this cylinder (3)
Inside the cylinder (35), the expansion chamber (3)
A displacer (40), which is formed into a compartment 6) and a working chamber (37), is fitted so as to be able to reciprocate in the left-right direction. The displacer (40) has a metal regenerator filled therein, and the space filled with the regenerator communicates with the expansion chamber (36) and the working chamber (37), respectively. When the low-temperature refrigerant gas expanded in the expansion chamber (36) goes to the working chamber (37), the refrigerant gas cools the cold storage material and stores cold heat in the cold storage material.
Conversely, the normal-temperature refrigerant gas flows from the working chamber (37) to the expansion chamber (3).
When going to 6), the refrigerant gas is cooled by the cold storage material.

A through hole (43) communicating with the working chamber (37) is formed near the base end (the right end in FIG. 1) of the cylinder (35). The other end of the coupling pipe (14) is connected. Thus, the working chamber (37) is connected to the compression chamber (11) of the compressor (100) via the connection pipe (14), and the displacer (40) is connected by the refrigerant gas pressure from the compressor (100). ) Is reciprocated to expand the refrigerant gas in the expansion chamber (36), thereby generating cold in the cold head (44) at the tip of the cylinder (35).

At the base end of the cylinder (35), like the casing (1) of the compressor (100), a cylindrical wall (51a) and two disk walls (51b) and (51b) are formed. A closed cylindrical casing (5
1) is fixedly mounted. In the casing (51), a support shaft (55) integrally fixed to the displacer (40) is provided so as to extend in the left-right direction concentrically with the cylindrical wall portion (51a). That is, the displacer (40) and the support shaft (55) constitute a movable body (22) of the expander (200) that reciprocates substantially horizontally in the expander (200). The support shaft (55) penetrates through the disk wall (51b) on the left side of the casing (51).
A seal member (57) is provided at a position where the support shaft (55) of (b) penetrates, and the seal member (57) seals the refrigerant so that refrigerant does not leak from the working chamber (37) into the casing (51). Has been made.

A pair of three leaf springs (31), (31), (31) are provided at two horizontally separated positions in the casing (51) of the support shaft (55). The elastic support means (3b) and (3b) are arranged and fixed, and the movable body (22) of the expander (200) can reciprocate in a substantially horizontal direction by the respective elastic support means (3b). ) Is elastically supported so as to be immovable in the vertical direction perpendicular to the reciprocating direction. The movable body (2) of the expander (200) is provided at the right end of the support shaft (55).
A balance weight (63) that constitutes a part of 2) is provided, and by this balance weight (63), the center of gravity position (G2) of the movable body (22) of the expander (200) is
Similar to the compressor (100), the pair of elastic support means (3
b) and (3b) are offset to the right of the center position (H2).

The operation of the above-structured Stirling refrigerator will be described. First, with the start of the operation of the refrigerator, an AC power supply having a predetermined frequency is supplied to the electromagnetic coil (20) of the linear motor (16) in the compressor (100). With this energization, the movable body (22) of the compressor (100) deforms the center of each leaf spring (31) of the compressor (100) in the left-right direction by the action of the magnetic field generated by the magnet (18). While the piston (9) reciprocates from the neutral position, the volume of the compression chamber (11) increases or decreases due to the reciprocation of the piston (9), and a pressure wave of a predetermined cycle is generated in the compression chamber (11). Since the compression chamber (11) communicates with the expander (200) through the connection pipe (14), when the pressure of the compression chamber (11) increases, the pressurized refrigerant gas is supplied to the working chamber ( 37) to increase the pressure in the working chamber (37). This increase in pressure causes a pressure difference between the working chamber (37) and the expansion chamber (36), and this pressure difference causes the displacer (40) to move the center of each leaf spring (31) of the expander (200). Cylinder (3
5) Move to the tip side. Since the working chamber (37) communicates with the expansion chamber (36) via the space in the displacer (40), in the next stage, the gas in the working chamber (37) passes through the displacer (40) and cools. It flows into the expansion chamber (36) while being cooled by the material, and both chambers (36) and (37)
, The displacer (40) moves toward the base end of the cylinder (35) by the restoring force of each leaf spring (31) of the expander (200) and returns to the original position.

Thereafter, immediately, the piston (9) of the compressor (100) retreats and the pressure in the compression chamber (11) decreases. For this reason, the refrigerant gas in the working chamber (37) returns to the compression chamber (11) via the connection pipe (14), and the working chamber (3)
7) The pressure inside is lower than that of the expansion chamber (36). Due to the pressure difference between the working chamber (37) and the expansion chamber (36), the displacer (40) moves the center of each leaf spring (31) of the expander (200) to the right while deforming the center of the cylinder (35). The refrigerant gas moves to the end side, and the refrigerant gas in the expansion chamber (36) is adiabatically expanded to generate cold. In the next stage, the expanded gas is supplied from the expansion chamber (36) to the displacer (40).
It flows into the working chamber (37) while giving cold heat to the cold storage material,
The differential pressure between the two chambers (36) and (37) disappears, and the displacer (40) moves toward the tip of the cylinder (35) by the restoring force of each leaf spring (31) of the expander (200) and returns to the original position. Return. One cycle is completed as described above, and thereafter, by repeating the same cycle, the cold head (44) at the tip of the cylinder (35) is gradually cooled to the cryogenic temperature.

Therefore, in this embodiment, the position of the center of gravity (G1) of the movable body (22) of the compressor (100) is higher than the center position (H1) of the pair of left and right elastic support means (3a) and (3b). When the movable body (22) is reciprocated in the left-right direction while being offset to the right, the amount of vertical displacement is the left end side of the movable body (22) (the side on which the piston (9) is provided). Is relatively small. In addition, the support rigidity of the left elastic support means (3a) for supporting the movable body (22) is set larger than that of the right elastic support means (3b), and the movable body (2
The blur amount on the left end side in 2) is further reduced. As a result, in the compressor (100), the amount of displacement of the piston (9) can be reduced to 1 micron or less at both the distal end portion and the proximal end portion, and therefore, the wear of the piston (9) can be reduced. Thus, the life of the compressor (100) can be extended.

At this time, the elastic support means (3a), (3b)
Since it is not necessary to excessively increase the rigidity of the movable body (22)
Of the compressor (10
The stroke of the reciprocating motion of the piston (9) in 0), the cycle of the reciprocating motion, and the like can be set relatively freely.
Also, based on Tables 1 and 2, it is possible to variously set the center of gravity (G1) of the movable body (22) and the support rigidity of the elastic support means (3a, 3b) within a predetermined relationship. Therefore, the arrangement of the elastic support means (3a) and (3b) and the number of leaf springs (31) can be changed according to the arrangement of the linear motor (16). As a result, the degree of freedom in design is improved.

<Other Embodiments> The present invention is not limited to the above-described embodiments, but includes various other embodiments. That is, in the above embodiment,
The number of leaf springs (31) in the pair of left and right elastic support means (3a) and (3b) is set to four (N1 = 4) and three (N2 = 3), respectively. Five (N1 = 5) and three (N2 = 3) sheets may be used. In this case, according to Tables 1 and 2, the amount of displacement of the piston (9) was -0.7 at the distal end and the proximal end, respectively.
0 microns and 0.19 microns. That is, the number of leaf springs (31) of the elastic support means (3a) and (3b) can be variously set based on Tables 1 and 2. On the basis of this, the amount of displacement of both the distal end and the proximal end of the piston (9) is 1
The position of the center of gravity (G1) may be set so as to be smaller than a micron.

In the above embodiment, the support rigidity of the left elastic support means (3a) close to the piston (9) is larger than that of the right elastic support means (3b), and the movable body (2
The position (G1) of the center of gravity of (2) is offset toward the right elastic support means (3b) far from the piston (9), but is not limited to this, for example, the left elastic support means (3a). May be made larger than the elastic support means (3b) on the right side, or the center of gravity (G1) of the movable body (22) may be simply offset.

In the above embodiment, the left elastic support means (3a), which is closer to the piston (9), has a higher rigidity than the right elastic support means (3b). Although the number of leaf springs (31) is greater than that of the right elastic support means (3b), the invention is not limited to this. For example, a leaf spring having a high spring constant is used for the left elastic support means (3a). You may do so.

In the above embodiment, the present invention is applied to the compressor (100) of the Stirling refrigerator. However, the present invention is not limited to this. For example, the expander (20) of the Stirling refrigerator may be used.
0), and can also be applied to reciprocating refrigerators other than the Stirling refrigerator.

[0047]

As described above, according to the reciprocating refrigerating machine of the first aspect of the present invention, the reciprocating refrigerating machine is disposed at two locations separated in the horizontal direction so that the movable body can reciprocate substantially horizontally. In a reciprocating refrigerator having a pair of elastic support means for elastically supporting the movable body so as to be immovable in a direction perpendicular to the reciprocating direction of the movable body, the position of the center of gravity of the movable body is moved between the pair of elastic support means by a piston. The offset is made closer to the elastic supporting means farther from the side. As a result, without excessively increasing the support rigidity of the elastic support means, it is possible to sufficiently reduce the displacement of the movable body at the portion where the piston is provided, and therefore, it is possible to reciprocate the movable body while ensuring the freedom of design. The life of the refrigerator can be extended.

According to the second aspect of the present invention, in the reciprocating refrigerator similar to the first aspect of the invention, the rigidity of the elastic support means closer to the piston is greater than that of the elastic support means farther away. By setting to, the same effects as those of the first aspect can be obtained.

According to the third aspect of the invention, more leaf springs are used for the elastic support means closer to the piston than the elastic support means farther from the piston, so that the elastic support means closer to the piston is used. Can be reliably set to be larger than the elastic support means on the far side. Further, since the spring constants of all the leaf springs (31) are equal, the setting of the supporting rigidity is facilitated.

According to the fourth aspect of the present invention, a leaf spring having a larger spring constant than the distant elastic supporting means is used for the elastic supporting means closer to the piston, so that the elastic supporting means closer to the piston can be used. The supporting rigidity of the supporting means can be set to be reliably larger than that of the elastic supporting means on the far side. Further, since the number of leaf springs of the two elastic support means is equal, the setting of the support rigidity becomes easy.

According to the fifth aspect of the present invention, the movable body has a piston which defines a compression chamber in a cylinder in the compressor. Further, in the invention of claim 6, the movable body has a displacer for forming an expansion chamber in a cylinder in the expander. Therefore, according to these inventions, the inventions of claims 1, 2, 3, and 4 can be effectively used.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view illustrating an entire configuration of a Stirling refrigerator according to an embodiment of the present invention.

FIG. 2 is a plan view showing a leaf spring.

FIG. 3 is a schematic diagram showing a support structure of a movable body in the compressor.

[Explanation of symbols]

 (3a), (3b) elastic support means (5) compressor cylinder (9) compressor piston (11) compression chamber (22) movable body (31) leaf spring (35) expander cylinder (36) expansion Room (40) Displacer (100) Compressor (200) Expander (G1) Position of center of gravity of movable body

Claims (6)

[Claims] 1. A movable body (22) having a piston (9) at a tip end thereof for defining a compression chamber (11) or an expansion chamber in a cylinder (5) and two movable parts horizontally separated from each other. At least one or more leaf springs (31) are provided so as to elastically support the movable body (22) reciprocally in a substantially horizontal direction and immovably in a direction perpendicular to the reciprocating direction of the movable body (22). ) And a pair of elastic support means (3a) and (3b), and the gas in the compression chamber (11) is compressed or the gas in the expansion chamber is expanded by the reciprocating motion of the movable body (22). The center of gravity (G1) of the movable body (22) is located between the two elastic support means (3a) and (3b) and is farther from the piston (9). It is characterized in that it is offset toward the support means (3b). Reciprocating refrigerator. 2. A movable body (22) having a piston (9) at its distal end defining a compression chamber (11) or an expansion chamber in a cylinder (5), and two movable parts horizontally separated from each other. At least one or more leaf springs (31) are provided so as to elastically support the movable body (22) reciprocally in a substantially horizontal direction and immovably in a direction perpendicular to the reciprocating direction of the movable body (22). ) And a pair of elastic support means (3a) and (3b), and the gas in the compression chamber (11) is compressed or the gas in the expansion chamber is expanded by the reciprocating motion of the movable body (22). The reciprocating refrigerator described above, wherein the elastic support means (3) on the side close to the piston (9)
The reciprocating refrigerator according to (a), wherein the rigidity of the movable body (22) in the direction perpendicular to the reciprocating direction of the movable body (22) is set larger than that of the elastic supporting means (3b) on the far side. 3. The elastic support means (3a), (3b) according to claim 2, wherein each of the elastic support means (3a) and (3b) is constituted by a leaf spring (31) having the same spring constant, and the elastic support means (3) on the side close to the piston (9). The reciprocating refrigerator according to claim 3, wherein the number of leaf springs in (3a) is larger than that of the elastic support means (3b) on the far side. 4. The elastic supporting means according to claim 2, wherein each elastic supporting means comprises the same number of leaf springs having different spring constants, and the spring constant of the elastic supporting means on the side closer to the piston has an elastic constant on the far side. A reciprocating refrigerator having a size larger than the support means. 5. The reciprocating refrigerator according to claim 1, wherein the piston (9) defines a compression chamber (11) in the cylinder (5) of the compressor (100). A reciprocating refrigerator. 6. The reciprocating refrigerating machine according to claim 1, wherein the piston is a cylinder (3) in the expander (200).
5) A reciprocating refrigerating machine characterized by being a displacer (40) defining an expansion chamber (36) therein.