JPH04347460A - Linear motor compressor - Google Patents

Abstract

PURPOSE:To prevent a linear reciprocating movement of a piston when a linear motor compressor is driven. CONSTITUTION:A leaf spring (17) deformed as a piston is moved in an axial direction for applying a predetermined biasing force to the piston through this deformation is comprised of an inner peripheral part (17a), an outer peripheral part (17b) and a plurality of deformation parts (17e), (17e) connecting the inner peripheral part (17a) with the outer peripheral part (17b). The deformation parts (17e) are arranged side-by-side in a circumferential direction, each of the deformation parts is bent at a plurality of locations. Deformation parts (17e), (17e) adjacent to each other in their circumferential directions are formed in a linear symmetrical form with respect to a straight line (A) extending in a radial direction of the leaf spring (17). With such an arrangement, the leaf spring (17) is prevented from being moved in a radial direction and a rotational direction when the leaf spring (17) is deformed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor compressor for compressing refrigerant supplied to an expander in a Stirling refrigerator, and more particularly to an elastic support structure for a movable member driven by a linear motor.

0002

2. Description of the Related Art Free-displacer type Stirling refrigerators have been known as a type of compact refrigerator that generates cryogenic temperatures. As an example of this refrigerator, for example, "Refrigerator for
Cryogenic Sensors” (NASA C
onferencePublication 2287
) has been disclosed. As shown in FIG. 8, this refrigerator is composed of a combination of a compressor (a) that compresses refrigerant gas and an expander (k) that expands the refrigerant gas discharged from the compressor (a). Ru. The compressor (a) is
For example, a closed casing (b) and a sealed casing (b).
) a cylinder (c) formed within the cylinder (c);
A piston (e) is reciprocatably fitted into the cylinder (c) and defines a compression chamber (d) in the inner space of the cylinder (c), and a linear motor (as a drive source for reciprocating the piston (e))
f). This linear motor (f) has an annular permanent magnet (g) arranged around a cylinder (c), and this magnet (g) creates a magnetic field in a cylindrical gap concentric with the center of the cylinder (c). to occur. A substantially inverted cup-shaped bobbin (h) fixed to the piston (e) at the center is reciprocatably arranged in the gap, and the bobbin (h)
) A drive coil (i) is wound around the outer periphery of the drive coil (i). In addition, the outside of the bottom surface of the bobbin (h) (the piston (e)
) and the inner bottom surface of the casing (b), a piston spring (j) consisting of a coil spring for elastically supporting the piston (e) in a reciprocating manner is installed between the drive coil (i) and the inner bottom surface of the casing (b). conductor (i1), (i1)
By passing an alternating current at a predetermined frequency, the drive coil (i) and bobbin (h) are driven by the action of the magnetic field passing through the gap, and the piston (e) is moved into the cylinder (
c) to generate gas pressure at a predetermined period in the compression chamber (d).

On the other hand, the expander (k) has a cylindrical cylinder (l), and inside this cylinder (l) is a cylinder (
l) A free displacer (o) that divides the inner space into an expansion chamber (m) and a working chamber (n) is fitted so as to be able to reciprocate. This free displacer (o) is filled with a metal regenerator material (o1) (regenerative heat exchanger), and the regenerator material (o1) is used in an expansion chamber (m) and a working chamber (n).
) communicating holes (o2) and (o3), respectively.
is opened. Further, a displacer spring (p) made of a coil spring that elastically supports the free displacer (o) in a reciprocating manner is disposed within the working chamber (n). Further, the working chamber (n) is connected to the compression chamber (d) of the compressor (a) via the coupling pipe (q), and the free display is controlled by the refrigerant gas pressure from the compressor (a). - The cylinder (l) is expanded by reciprocating the cylinder (o) to expand the refrigerant gas in the expansion chamber (m).
It is designed to generate cold in the cold head at the tip.

0004

By the way, as an example of such a linear motor compressor (a), a piston (e
There is one in which a small gap is formed between the cylinder (c) and (e) without bringing the outer peripheral surface of the cylinder (c) into contact with the inner peripheral surface of the cylinder (c). This seals the small gap with a fluid seal or the like to prevent refrigerant from leaking from the compression chamber (d), while also eliminating friction loss between the piston (e) and cylinder (c). The aim is to improve compressor efficiency. In this type of linear motor compressor (a), basically no load is applied in a direction (radial direction) orthogonal to the reciprocating direction of the piston (e). However, due to dimensional errors and installation errors of each member, during actual operation, the piston (e)
Shaking in the radial direction occurs in the linear reciprocating motion of the piston (e), and the outer circumferential surface of the piston (e) comes into contact with the inner circumferential surface of the cylinder (c), increasing the resistance of the reciprocating motion of the piston (e), and in some cases, the cylinder may (c) or the piston (e) may wear out, which causes problems such as a decrease in compressor efficiency and a shortened lifespan of the cylinder (c) and piston (e).

In view of this point, it is conceivable to form the piston spring with a flat rectangular plate spring to restrict movement in the radial direction. Since the amount of deformation in the direction of movement (axial direction) cannot be increased, a sufficient stroke of the piston cannot be ensured. Further, as shown in FIG. 9, the piston spring is formed of a thin disc-shaped plate material (r), and spiral notches (s) are formed at multiple locations on this plate material (r). , (s) may be a leaf spring (t), and a configuration may be considered in which the leaf spring (t) enables deformation in the axial direction as the piston (e) reciprocates. However, in such a configuration, deformation in the axial direction is performed while each leaf spring (t) is slightly displaced in the circumferential direction of the plate (r) (in the direction indicated by the arrow in FIG. 9). Furthermore, if the center of this circumferential displacement deviates even slightly from the cylinder center, the linear reciprocating motion of the piston (e) will oscillate in the radial direction.

The present invention has been made in view of these points, and it is possible to suppress the displacement of the center of the spring in the radial direction when the compressor is driven, and to prevent the deflection during the linear reciprocating motion of the piston. The purpose is to obtain a linear motor compressor that can

[0007]

[Means for Solving the Problems] In order to achieve the above object, the invention according to claim 1 comprises a spring means for elastically supporting the piston, which is a disk-shaped leaf spring, and which accompanies the reciprocating movement of the piston. When deformed, the spring shape is such that the center does not move in the radial direction or deform in the circumferential direction. Specifically, a cylinder (4) provided on a fixed body (2), and a cylinder (4) arranged so as to be able to reciprocate within the cylinder (4) to define a compression chamber (7) in the space inside the cylinder (4). a piston (6), the piston (6) and the fixed body (
2), which connects the piston (6) to a fixed body (
2), a magnet (13) attached to the fixed body (2), and a coil (15) provided to the piston (6); The present invention is directed to a linear motor compressor equipped with a linear motor (11) that reciprocates the piston (6) within the cylinder (4) by supplying an alternating current of a predetermined frequency to the linear motor (15). The spring means (16) is provided with a substantially disc-shaped leaf spring (17) having an inner peripheral part (17a) and an outer peripheral part (17b), and the inner peripheral part (
17a) and the outer peripheral part (17b) are connected by a plurality of deformed parts (17e), (17e), . . . arranged in parallel in the circumferential direction. The deformed portion (17e) is curved at a plurality of locations, and the deformed portions (17e) are adjacent to each other in the circumferential direction.
, (17e) are formed in a line-symmetric shape with respect to a straight line extending in the radial direction of the leaf spring (17).

[0008] According to the second aspect of the invention, the leaf spring according to the first aspect of the invention is used in a compressor that causes a cylinder to reciprocate with respect to a piston. Specifically, the piston (25) is provided on the fixed body (2), and the piston (25) is arranged inside the piston (25).
), a movable cylinder (26) with a bottom that defines a compression chamber (7) in an internal space, and a movable cylinder (26) installed between the movable cylinder (26) and the fixed body (2). ,
a spring means (16) that elastically supports the movable cylinder (26) with respect to the fixed body (2); a magnet (13) attached to the fixed body (2); and a spring means (16) provided on the movable cylinder (26). A linear motor (11) having a coil (15) and reciprocating the movable cylinder (26) with respect to the piston (25) by supplying an alternating current of a predetermined frequency to the coil (15). -Target compressors. The spring means (16) is provided with a substantially disc-shaped leaf spring (17) having an inner peripheral part (17a) and an outer peripheral part (17b), and the inner peripheral part ( 17a) and the outer peripheral part (17b) are connected by a plurality of deformed parts (17e), (17e), . . . arranged in parallel in the circumferential direction. The deformed portion (17e) is curved at a plurality of locations, and deformed portions (17e), (17
e) is formed in a line-symmetric shape with respect to a straight line extending in the radial direction of the leaf spring (17).

[0009] According to the third aspect of the invention, the leaf spring that deforms as the piston reciprocates is bent in the direction of deformation so that a large amount of deformation can be ensured. Specifically, a cylinder (4) provided on a fixed body (2), and a cylinder (4) arranged so as to be able to reciprocate within the cylinder (4) to define a compression chamber (7) in the space inside the cylinder (4). a piston (6), installed between the piston (6) and the fixed body (2),
Spring means (16) elastically supporting the piston (6) with respect to the fixed body (2); a magnet (13) attached to the fixed body (2); and a coil (13) provided on the piston (6). 15) and a linear motor (11) that reciprocates the piston (6) within the cylinder (4) by supplying an alternating current of a predetermined frequency to the coil (15). It is aimed at machines. The spring means (16) is provided with an inner circumferential portion (30a) and an outer circumferential portion (30a).
0b), and has an inner circumference (30a) and an outer circumference (30a) of the plate spring (30).
b) and a plurality of deformed portions (33) arranged in parallel in the circumferential direction, (
34). and the deformed portion (33)
, (34) are formed to extend in the radial direction of the leaf spring (30) and are bent in the thickness direction thereof.

The invention according to claim 4 provides a linear motor compressor according to claim 1.2 or 3, in which spring means (16
) is constructed by stacking a plurality of leaf springs (17), (17), ... in the axial direction of the piston (6).

[0011]

[Operation] With the above configuration, in the invention according to claim 1,
As the compressor is driven, the piston (6) linearly reciprocates within the cylinder (4) and changes the volume of the compression chamber (7), thereby compressing the fluid within the compression chamber (7). ,
This compressed fluid is discharged toward the expander. When such a compressor is driven, the piston (6) that reciprocates linearly is subjected to an urging force due to the deformation of the leaf spring (17) forming the spring means (16). As for the deformation operation of the leaf spring (17), the deformed portion (17e) of the leaf spring (17) is curved at multiple locations, and the deformed portions (17e), (17e) that are adjacent to each other in the circumferential direction are Since the deformation portion (17e) is formed in a line-symmetrical shape with respect to a straight line extending in the radial direction of the leaf spring (17), the deformation portion (17e) prevents the piston (6) from deforming in the radial direction and the circumferential direction while axially Deforms only in the direction. Therefore, the piston (
6) There is no possibility that the linear reciprocating movement will cause vibration in the radial direction.

[0012] In the invention according to claim 2, the piston (25
In a compressor in which the movable cylinder (26) is configured to reciprocate with respect to ) deforms only in the axial direction while restricting deformation in the radial and circumferential directions. Therefore, the linear reciprocating motion of the movable cylinder (26) is prevented from wobbling in the radial direction.

[0013] In the invention according to claim 3, the leaf spring (30)
Since the deformable portions (33) and (34) extend in the radial direction of the leaf spring (30), the linear reciprocating motion of the piston (6) is similar to the effect in the invention according to claim 1 described above. There will be no vibration in the radial direction, and in addition, since the deformed portions (33) and (34) are bent in the thickness direction of the leaf spring (30),
A large amount of deformation in the axial direction is ensured, and the piston (
6) The stroke can be made longer.

[0014] In the invention as set forth in claim 4, the spring means (16) is constituted by a plurality of leaf springs (17), (17),... stacked one on top of the other in the axial direction of the piston (6). , the urging force acting on the reciprocating member (piston (6) or movable cylinder (26)) can be adjusted appropriately, and the reliability of the movement of the reciprocating member (6), (26) is greatly ensured. can.

[0015]

Embodiments (First Embodiment) Hereinafter, a first embodiment of the invention as claimed in claim 1 will be explained based on the drawings. FIG. 1 shows a compressor (1) for a Stirling refrigerator according to the first embodiment. This compressor (1) is a conventionally known free compressor (not shown).
In combination with a displacer type expander (see FIG. 8), a refrigerator is constructed. The compressor (1) has a cylindrical casing (2) as a fixed body. This casing (2) consists of casing assemblies (3), (3) and a cylinder member (4). The casing assemblies (3), (3) are a pair of left and right bottomed cylindrical members made of pure iron and having substantially the same configuration, each of which is concentric with the other and has a cylindrical shape extending in the direction of its center line. They are arranged to face each other with a predetermined interval therebetween. The cylinder member (4) is held between the two casing assemblies (3), (3). The cylinder member (4) is an outer cylinder (4a)
and an inner cylinder (4b) are connected by a donut-shaped connecting member (4c). The inner cylinder (4b) is a part that becomes an original cylinder, and the inside thereof is formed with a piston insertion hole (5). And this inner circumference (4b)
A pair of left and right cylindrical pistons (6), (6) each having a bottomed center hole (6a) are inserted into the piston insertion hole (5), respectively. The part surrounded by the inner cylinder (4b) in between is a compression chamber (7). In addition, the outer diameter dimension of the piston (6) is that of the inner cylinder (4b).
A small gap of, for example, about 10 μm is formed between the two (4b) and (6), and this small gap can be sealed by a fluid seal or the like. This ensures the airtightness of the compression chamber (7). Further, the outer peripheral surface of the piston (6) is coated with resin (
(not shown) is fitted.

Further, a gas passage (8) is formed in this cylinder member (4) and extends from the piston insertion hole (5) in the radial direction (upward in FIG. 1). The end opens into the compression chamber (7), while the gas passage (8
) is connected to an expander (not shown) by a connecting pipe (10) via an annular gas passageway (9) that extends annularly inside the outer cylinder (4a). In addition, in the center of the compression chamber (7), the compression chamber (7) is divided into left and right compression chambers (7), (7).
A partition wall (7a) is provided to divide each compression chamber (
7) and (7) are configured to communicate independently with the gas passage (8).

The left and right pistons (6), (6) are drivingly connected to linear motors (11), (11) serving as drive sources for reciprocating the pistons (6), (6). That is, each linear motor (11) has a cylindrical member (12) made of pure iron fixed to the inner cylinder (4b) of the cylinder member (4), and this cylindrical member (12) is connected to the cylinder member (4). 4) into the inner cylinder (4b) of the cylinder member (4).
) is externally fitted to the outer cylinder (4a) with a predetermined gap. An annular permanent magnet (13) is fixed to the outer periphery of the cylindrical member (12) with a predetermined gap from the inner circumferential surface of the outer cylinder (4a). A magnetic field of a predetermined strength is generated in the gap between the permanent magnet (13) and the outer cylinder (4a) by using the member (12) and the cylinder member (4) as a yoke.

Each of the pistons (6) has a flange portion (6b) extending radially outward from the end opposite to the center of the cylinder member (4) of the piston (6). ), which extends concentrically with the piston (6) toward the center of the cylinder member (4), and whose tip ends are located on the left and right sides of the gap between the permanent magnet (13) and the inner peripheral surface of the outer cylinder (4a). A cylindrical bobbin (1
4) are connected. A recessed coil winding part (14a) is formed on the outer periphery of the bobbin (14) at a position facing the permanent magnet (13), and a coil (15) is formed in this coil winding part (14a). is wrapped around it.

Then, an alternating current of a predetermined frequency (for example, 50 Hz) corresponding to the natural frequency determined by the mass of each piston (6) and the spring constant of the spring means (16) described later is applied to both linear motors (11), (11). ) coils (15), (15
), both pistons (6),
(6) are reciprocated in opposite directions at the natural frequency to generate gas pressure at a predetermined period in the compression chamber (7).

As a feature of the present invention, a casing of the casing (2) is provided at the rear end of each of the pistons (6), so that the piston (6) can reciprocate within the cylinder member (4). Spring means (16) are provided for resilient support to the assembly (3). The structure around this spring means (16) will be explained below. A connecting shaft (6c) extends from the bottom of the center hole (6a) toward the outside in the direction of the center line of the casing (2) at the center of each piston (6). (
A plurality of leaf springs (17), (17),
...is arranged. As shown in FIG. 2, this leaf spring (17) is made of a substantially disc-shaped member with a small plate thickness.
At its center is a connecting shaft (
An inner circumferential portion (17a) supported by the casing (6c) is provided, while an approximately ring-shaped outer circumferential portion (17a) is supported by the casing (17a).
An outer peripheral portion (17b) is provided which is supported by the casing assembly (3) of 2). In addition, the inner peripheral part (1
A center attachment hole (17c) is formed in the center of 7a), and outer circumference attachment holes (17d), (17d), …
is formed. The leaf spring (17) has a plurality of deformable parts (17e), (17e), . . . installed between the inner peripheral part (17a) and the outer peripheral part (17b). The deformed portions (17e) are formed in a total of 4 pairs with angular intervals of 90°, one set being symmetrical with respect to a straight line extending in the radial direction of the leaf spring (17) (straight line A in FIG. 2). They are arranged in parallel in the circumferential direction. This deformed part (17e
), the inner end of the deformable portion (17e) is connected to the inner circumferential portion (17a), and the inner circumferential portion (17a) is connected to the inner circumferential portion (17a).
17a) toward the outer periphery (17b), it is first curved in one circumferential direction (for example, clockwise), then curved in the opposite direction, and then curved toward the outer periphery (17b). It is formed so as to face the other circumferential direction (counterclockwise direction), and its outer end is connected to the outer circumferential portion (17b). The deformed portions (17e) and (17e) that are adjacent to each other have their curved directions set to be opposite to each other. With this, as mentioned above,
The deformed portions (17e) and (17e) adjacent to each other are formed in a shape that is symmetrical with respect to the straight line A extending in the radial direction of the leaf spring (17). A plurality of leaf springs (17) thus formed (in this example, three on each side) are stacked on top of each other with a predetermined interval. To explain the mounting structure of each leaf spring (17), there is a center mounting hole (17c) of one leaf spring (17).
) of the piston (6) so that the leaf spring (17) is inserted into the connecting shaft (6c) of the piston (6).
6c) is assembled so as to be in contact with the outer end surface of the large diameter portion (6d) provided near the rear end portion, and a small diameter ring-shaped bush (18) is inserted and arranged on the outside thereof. After inserting the leaf springs (17) and bushes (18) alternately in this way, screw the nut (N) onto the outer end of the connecting shaft (6c) to connect the large diameter portion (6d) and the nut ( A plurality of leaf springs (17) are held at a predetermined distance between them. On the other hand, the outer peripheral part (17b) of the leaf spring (17) is assembled to the casing assembly (3) by inserting screws (not shown) into the outer peripheral part attachment holes (17d).

In the figure, (20) is a linear motor (11).
) is a guide tube for guiding the lead wire that supplies power to the coil (15). (21) is a cover that covers each casing assembly (3).Next, the operation of this embodiment will be explained. When the refrigerator starts operating, the compressor (
An alternating current of a predetermined frequency (50 Hz) is synchronously applied to the coils (15), (15) of both linear motors (11), (11) in 1). With this energization, the coils (15), (15) and the pistons (6), (6) are
reciprocate in opposite directions while deforming the leaf springs (17), (17), respectively, and these pistons (6), (6
) move forward and backward within the cylinder member (4) in synchronization with each other, the volume of the compression chamber (7) increases and decreases, and pressure waves with a predetermined period are generated within the compression chamber (7). Since this compression chamber (7) is in communication with the expander via the coupling pipe (10), the displacer in the expander reciprocates in the same cycle as the pressure waves in the compression chamber (7). The expansion of the gas causes refrigeration, and the repeated reciprocation of this displacer cools the cold head at the tip of the cylinder to an extremely low temperature level.

[0022]The leaf spring (1) in this driving state
The deformation operation of 7) includes a plurality of deformation parts (17e), (
17e), . When deforming (in the axial direction), no movement in the radial direction or rotation around the center of the leaf spring occurs. For this reason, the piston (6) performs a predetermined linear reciprocating motion and does not oscillate in the radial direction. In addition, the deformed part (17e)
Since the piston (6) is curved in the horizontal direction, a sufficient amount of downward deformation can be ensured.
) can ensure a large stroke.

As described above, according to the configuration of this example, while a sufficient amount of movement of the piston (6) is ensured, the outer circumferential surface of the piston does not touch the inner circumferential surface of the cylinder during the reciprocating movement of the piston (6). Contact situations are avoided, and friction loss and wear of the piston (6) and cylinder members (4) when driving the compressor are prevented, improving compressor efficiency and compressor (1).
The lifespan of the product can be extended.

(Second Embodiment) Next, a second embodiment of the invention as claimed in claim 2 will be described. For this example,
The same members as in the first embodiment described above are given the same reference numerals, and detailed explanation thereof will be omitted. The compressor (1) of the first embodiment had a piston (6) that reciprocated within the cylinder member (4), but in this example, the cylinder reciprocated relative to the piston. It was made to move.

That is, in this embodiment, as shown in FIG. 4, a piston member (25) is disposed between the left and right casing assemblies (3), (3). This piston member (25) is connected to the casing assembly (3), (
3) Consists of a substantially disk-shaped flange portion (25a) held between, and left and right pistons (25b), (25b) extending concentrically from the center of the flange portion (25a) in the left-right direction. A gas passage (8) is formed in the center of the piston member (25) and extends between the tips of the left and right pistons (25b). Connected to an expander not shown.

A bottomed movable cylinder (26), (26) is externally fitted to each of the pistons (25b), (25b) so as to be able to reciprocate, and a piston (26) is fitted into the inner space of each movable cylinder (26). 25b), (25b) creates a compression chamber (7)
, (7), and this compression chamber (7) is always in communication with the gas passage (8). A flange portion (26a) is formed at the open end of the movable cylinder (26), and a linear motor (11) is attached to this flange portion (26a).
bobbin (14) is attached, and the linear motor (
11) compresses the gas in the compression chamber (7) at regular intervals.

Spring means (16) for elastically supporting the movable cylinder (26) with respect to the casing assembly (3) is provided between the outer bottom surface (back surface) of each movable cylinder (26) and the casing assembly (3). It is being constructed. This spring means (16) is similar to that of the first embodiment, and is inserted and attached to a connecting shaft (26b) extending outward from the back surface of the movable cylinder (26).

Therefore, in this embodiment as well, the coils (15) and (1) of both linear motors (11) and (11)
When an alternating current is synchronously applied to the coil (1), the coil (1)
5), (15) and movable cylinders (4), (4) reciprocate in opposite directions. Both movable cylinders (
4), (4) advance and retreat in synchronization with each other, the volumes of both compression chambers (7), (7) increase and decrease, and the compression chambers (7),
(7) A pressure wave with a predetermined period is generated within.

In this case, the movable cylinder (26) is reciprocated by the operation of the linear motor (11), and when the movable cylinder (26) retreats and approaches the casing assembly (3), the leaf spring ( 17), a predetermined urging force is applied. As for the deformation operation of this leaf spring (17), as in the case of the first embodiment described above, a plurality of deformation parts (17e
), (17e), ... are formed symmetrically with respect to the straight line extending in the radial direction of the leaf spring (17),
When deforming in the thickness direction, no movement in the radial direction or rotation around the center of the leaf spring occurs. For this, the cylinder (
26) performs a predetermined linear reciprocating motion and does not oscillate in the radial direction.

(Third Embodiment) Next, a third embodiment of the present invention will be described. In this example as well, the same parts as in the first embodiment described above are denoted by the same reference numerals, and only the characteristic parts will be explained.

As shown in FIG. 5, the compressor (1) of this example has only one set of a cylinder (4) and a piston (6), and the piston (6) is inside the cylinder (4). It is configured to perform linear reciprocating motion in the vertical direction. A plate spring (
Similarly to the first embodiment described above, a plurality of pistons 30) are stacked one on top of the other at a predetermined interval at the rear end of the connecting shaft (6c) provided on the piston (6).

[0032] This leaf spring (30) will be explained in detail below. As shown in FIG. 6, the leaf spring (30) of this example has slits (31), (32 ) are provided, and each plate material portion between the inner slits (31), (31) and between the outer slits (32), (32) is formed into a deformed portion (33), (34), and the deformed portion Part (33),
(34) is curved in the thickness direction of the leaf spring (30), as shown in FIG. In other words, the inner deformed portion (33) and the outer plate portion (34) that are adjacent to each other in the circumferential direction are curved in opposite directions in the vertical direction. Then, the plate spring (30
) are stacked one on top of the other at a predetermined interval (five in this example), thereby configuring the spring means (16) as referred to in the present invention. According to such a configuration,
Similar to the first embodiment described above, the linear reciprocating motion of the piston (6) does not cause vibration in the radial direction, and in addition, the deformed portions (33), (34)
By being bent in the thickness direction of the leaf spring (30), a large amount of deformation of the leaf spring (30) in the axial direction is ensured, and the stroke of the piston (6) can be set long. can.

In the third embodiment, a compressor was described in which the piston (6) reciprocated within the cylinder (4), but this spring means (16) was used in the second embodiment. A movable cylinder (26) as shown is connected to a piston (2
It may be employed in a compressor configured to reciprocate relative to 5b).

Furthermore, in each of the above-mentioned embodiments, the cylinder (
4) and the piston (6), the present invention is not limited to this, and the present invention is not limited to this. It may be applied to a contact type compressor in which a small gap is not formed between them.

[0035]

As described above, according to the invention set forth in claim 1, the deformable portion (17e) of the leaf spring (17) that deforms with the reciprocating movement of the piston (6) is curved at a plurality of locations. , and the deformed parts (17e) and (1
7e) is formed in a line-symmetrical shape with respect to a straight line extending in the radial direction of the leaf spring (17), so that when the leaf spring (17) deforms, the deformed portion (17e) moves in the radial direction of the piston (6) or Since the piston (6) is deformed in the axial direction while restricting its movement in the circumferential direction, the linear reciprocating motion of the piston (6) is prevented from wobbling in the radial direction, and the amount of movement of the piston (6) is prevented from occurring. While ensuring that the piston (6) reciprocates, a situation where the outer circumferential surface of the piston comes into contact with the inner circumferential surface of the cylinder is avoided, reducing friction loss when driving the compressor and reducing piston (6) and cylinder members. (4
), it is possible to improve compressor efficiency and extend the life of the compressor.

According to the invention of claim 2, the piston (25
Even in a compressor in which the movable cylinder (26) is configured to reciprocate with respect to ), similar to the effect of the invention according to claim 1 described above, the linear reciprocating motion of the movable cylinder (26) has an effect in the radial direction. Since run-out is not caused, it is possible to improve compressor efficiency and extend the life of the compressor.

According to the invention of claim 3, the leaf spring (30)
The deformed portions (33) and (34) are made to extend in the radial direction of the leaf spring (30) so that the linear reciprocating motion of the piston (6) does not cause deflection in the radial direction, and The deformed parts (33) and (34) are connected to the plate springs (30
) by bending in the thickness direction.
A large amount of deformation in the axial direction is ensured, and the piston (
Since the stroke of 6) can be made longer, it is possible to improve compressor efficiency and extend the life of the compressor while maintaining the degree of freedom in designing the compressor.

According to the fourth aspect of the invention, the spring means (16) is constructed by stacking a plurality of leaf springs (17), (17), ... in the axial direction of the piston (6). , the biasing force acting on the reciprocating member such as the piston (6) or the operating cylinder (26) can be appropriately adjusted,
Moreover, the reliability of the movement of the reciprocating members (6) and (4) can be greatly ensured.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional side view of a linear motor compressor according to a first embodiment of the present invention.

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

FIG. 3 is a side view of the leaf spring.

FIG. 4 is a diagram corresponding to FIG. 1 in a second embodiment of the present invention.

FIG. 5 is a diagram corresponding to FIG. 1 in a third embodiment of the present invention.

FIG. 6 is a plan view of the leaf spring.

FIG. 7 is a side view of the leaf spring.

FIG. 8 is a vertical sectional side view showing a conventional Stirling refrigerator.

FIG. 9 is a plan view showing an example of a conventional leaf spring.

[Explanation of symbols]

(1) Linear motor compressor (2)
Casing (fixed body) (4) Cylinder member (cylinder) (6) Piston (7) Compression chamber (11) Linear motor (13) Permanent magnet (15) Coil (16) Spring means (17), (30 ) Leaf spring (17a), (30a) Inner periphery (17b), (30b) Outer periphery (17e), (33), (34) Deformed part (25)
Piston member (piston) (26) Movable cylinder

Claims (4)

[Claims] [Claim 1] A cylinder (
4), which is reciprocably arranged within the cylinder (4);
A piston (6) that defines a compression chamber (7) in the inner space of the cylinder (4), and the piston (6) and the fixed body (2).
The piston (6) is installed between the fixing body (2) and the piston (6).
spring means (16) for elastically supporting the magnet (13) attached to the fixed body (2) and the piston (
6), and has a coil (15) provided in the coil (15).
5) A linear motor compressor comprising a linear motor (11) that reciprocates the piston (6) within the cylinder (4) by supplying an alternating current of a predetermined frequency to the compressor,
The spring means (16) has an inner peripheral part (17a) and an outer peripheral part (
The plate spring (17) has a substantially disc-shaped plate spring (17) having an inner peripheral part (17a) and an outer peripheral part (17b).
17b) refers to a plurality of deformed portions (17e) arranged in parallel in the circumferential direction.
), (17e), .
17) A linear motor compressor characterized by being formed in a line-symmetrical shape with respect to a straight line extending in the radial direction. [Claim 2] A piston (
25), a bottomed movable cylinder (26) in which the piston (25) is disposed and is capable of reciprocating relative to the piston (25), and defines a compression chamber (7) in the internal space;
a spring means (16) installed between the movable cylinder (26) and the fixed body (2) and elastically supporting the movable cylinder (26) with respect to the fixed body (2);
) and the movable cylinder (
26), and has a coil (15) provided at the coil (26).
15) A linear motor compressor comprising a linear motor (11) that reciprocates the movable cylinder (26) relative to the piston (25) by supplying an alternating current of a predetermined frequency to the spring means. (16) is the inner peripheral part (17
a) and an outer peripheral portion (17b).
17), and the inner peripheral part (17) of the leaf spring (17)
a) and the outer peripheral part (17b) are connected by a plurality of deformed parts (17e), (17e), ... arranged in parallel in the circumferential direction, and the deformed part (17e) is curved at a plurality of places. , deformed parts (17e), (17
e) A linear motor compressor characterized in that it is formed in a line symmetrical shape with respect to a straight line extending in the radial direction of the leaf spring (17). [Claim 3] A cylinder (
4), which is reciprocably arranged within the cylinder (4);
A piston (6) that defines a compression chamber (7) in the inner space of the cylinder (4), and the piston (6) and the fixed body (2).
The piston (6) is installed between the fixing body (2) and the piston (6).
spring means (16) for elastically supporting the magnet (13) attached to the fixed body (2) and the piston (
6), and has a coil (15) provided in the coil (15).
5) A linear motor compressor comprising a linear motor (11) that reciprocates the piston (6) within the cylinder (4) by supplying an alternating current of a predetermined frequency to the compressor,
The spring means (16) has an inner peripheral part (30a) and an outer peripheral part (
30b), the plate spring (30) has an inner circumferential portion (30a) and an outer circumferential portion (30b).
30b) refers to a plurality of deformed parts (33) arranged in parallel in the circumferential direction.
, (34), and the deformed portion (33
), (34) extend in the radial direction of the leaf spring (30) and are bent in the thickness direction thereof. [Claim 4] The linear motor according to claim 1.2 or 3.
In the linear motor compressor, the spring means (16) is composed of a plurality of leaf springs (17), (17), ... stacked one on top of the other in the axial direction of the piston (6). ta compressor.