JPH0472473A - Linear motor compressor for stirling refrigerator and manufacture of lead wire for applying current to motor - Google Patents

Abstract

PURPOSE:To facilitate the installation of a lead wire by forming this power- feeding current-applying lead wire of a coil spring for elastically supporting the piston of a compressor and a mesh conductor for covering the coil spring through insulating covering material. CONSTITUTION:A piston spring 30 for elastically supporting each piston 7 of a compressor 1 is covered with a mesh conductor 33 through covering material 32, and the respective end parts of the spring 30 and mesh conductor 33 are connected to the coil 16 of a linear motor 13, so that power is fed to the coil 16 through the spring 30 and the mesh conductor 33 around the spring 30. Since a lead wire 31 for applying a current to the coil 16 is formed of the piston spring 30 and the mesh conductor 33, the piston spring 30 functions as core material for holding the fixed shape against deformation in addition to being flexible, and therefore the curve angle of the lead wire 31 becomes uniform at any part. Also the shape change of the lead wire 31 generated in association with the movement of the coil 16 is uniformed.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a Stirling refrigerator that has an expander that generates cryogenic cold by the reciprocating motion of a displacer. The present invention relates to a method for manufacturing a motor compressor and a current-carrying lead wire that carries current to a linear motor thereof.

(Prior Art) This free displacer type Stirling refrigerator has been known as a type of small refrigerator that generates cryogenic cold. For example, as shown in FIG. 8, this refrigerator combines a compressor (a) that compresses refrigerant gas and an expander (k) that expands the refrigerant gas discharged from the compressor (a). The above compressor (a
) includes, for example, a hermetically sealed casing (b), a cylinder (C) formed in the casing (b), and a cylinder (c) that is fitted in the cylinder (c) so as to be able to reciprocate. The piston (e) defines a compression chamber (d), and a linear motor (f) serves as a drive source for reciprocating the piston (e). This linear motor (f) has an annular permanent magnet (g) placed around the cylinder (C).
The magnet (g) generates a magnetic field in a cylindrical gap concentric with the center of the cylinder (C). A substantially cup-shaped bobbin (h) integrally fixed to the piston (e) at the center is arranged in the gap so as to be able to reciprocate, and a drive coil (i) is arranged around the outer periphery of the bobbin (h). wrapped around it. Further, between the outer bottom surface of the bobbin (h) (the side opposite to the piston (e)) and the inner bottom surface of the casing (b), there is a piston consisting of a coil spring for elastically supporting the piston (e) so as to be able to reciprocate. A spring (j) is installed, and by applying an alternating current of a predetermined frequency to the drive coil (i), the coil (i) and bobbin (h) are driven by the action of the magnetic field passing through the gap, and the piston ( By reciprocating the cylinder (e) within the cylinder (c), the compression chamber (
In step d), gas pressure is generated at a predetermined period.

On the other hand, the expander (k>) has a cylindrical cylinder (it), and inside the cylinder (1), the space inside the cylinder (it) is divided into an expansion chamber (m) and a working chamber (n). A free displacer (0) is fitted so as to be able to reciprocate.

This displacer (0) has a metal cold storage material (o
+) (regenerative heat exchanger), and the cold storage material (
Communication holes (02) and (03) are opened to communicate the ol) with the expansion chamber (m) and the working chamber (n), respectively. In addition, in the working chamber (n), there is a displacer (
A displacer spring (p) made of a coil spring that elastically supports the reciprocating movement of the displacer spring (p) is provided. Further, the working chamber (n) is connected to the compression chamber (d) of the compressor (a) via the coupling pipe (q), and the displacer (o
) is reciprocated to expand the refrigerant gas in the expansion chamber (m), thereby generating cold in the cold head at the tip of the cylinder (CD) (for example, "Rerr").
igerator for Cryogenlc 5e
nsors, NASA Conference
(See Publication 22g7, etc.).

(Problem to be Solved by the Invention) By the way, in the above linear motor compressor (a), power is normally supplied to the coil (i) of the linear motor Cf) via the lead wires (it) and (it). It is designed to supply However, with the downsizing of the compressor (a), the lead wire (it).

When the installation space for (11) becomes narrower, it becomes difficult to manage it, and as the piston (e) or coil (i) moves, the lead wires (it) and (it) interfere with surrounding fixed objects. The coating may be torn or bent at an acute angle, resulting in fatigue failure.

For this reason, the compressor (a) has problems in terms of durability and reliability, and improvements have been desired.

The present invention has been made in view of the above, and its purpose is to facilitate the routing of the lead wires by improving the current-carrying lead wires for the coils of the above-mentioned linear motor.
The purpose is to eliminate interference with fixed objects around the lead wire due to movement of the coil.

Another object of the present invention is to enable efficient manufacturing of the current-carrying lead wires for the linear motor.

(Means for Solving the Problem) In order to achieve the above object, in the invention according to claim (1), one side of the coil of the linear motor is provided by a piston spring consisting of a coil spring that elastically supports the piston so as to be able to reciprocate. The mesh conducting wire covered with the piston spring via an insulating coating constitutes the other current conducting path to the coil.

Specifically, in this invention, as shown in FIGS. 1 and 2, the linear motor compressor includes a casing (2), a cylinder (6) provided in the casing (2), and a A piston (7) is fitted in the cylinder (6) so as to be able to reciprocate and define a compression chamber (11) in the space inside the cylinder (6), and the piston (7) is reciprocated within the cylinder (6). A piston spring (30) consisting of a coil spring that elastically supports the casing (2) in a movable manner, and a magnet (15).
) and a coil (16), and a linear motor (13) that supplies alternating current of a predetermined frequency to the coil (16) through a current-carrying lead wire (31) to reciprocate the piston (7).

The piston spring (30) is electrically connected to one end of the coil (16), and the piston spring (30) is connected to one end of the coil (16).
) has a mesh conductor (
32) are concentrically covered with an insulating coating material (32), and the piston spring (30) and mesh conductor (33) constitute a current-carrying lead wire (31) that energizes the coil (16). has been done.

In the invention of claim ('2J), a current-carrying lead wire having the same structure as the invention of claim (1) above is provided separately from the piston spring, and this current-carrying lead wire is connected to a conductive core material and an insulating coating to the core material. It consists of a mesh conductor wire covered concentrically with a material in between.

That is, in this invention, as shown in FIGS. 3 and 4, a current-carrying lead wire (31'
) is a conductive core material (35) that is spirally wound concentrically with the axis of the cylinder (6) and is electrically connected to one end of the coil (16).
and a mesh conducting wire (33) which is concentrically coated on the conductive core material (35) via an insulating coating material (32) and is electrically connected to the other end of the coil (16).

In the invention of claim (3), the linear motor current-carrying lead wire, which is separate from the piston spring, is connected to a non-conductive core material made of resin, and an inner and outer wire that is concentrically covered with the core material through an insulating coating material. It consists of a pair of mesh conductor wires.

That is, in this invention, as shown in FIG. 5, a solid core material (37) made of resin is provided which is spirally wound concentrically with the axis of the cylinder (6), and a linear motor is attached to the core material (37). (
A pair of mesh conductor wires (38) (40) that are electrically connected to the ends of the coil (16) of 13) are covered with an insulating coating (39)
This pair of mesh conductors (
38).

In the invention of claim (4), in which the current-carrying lead wire (36) is characterized by (40), the resin core material in the invention of claim (3) is formed into a hollow cylindrical shape, and one mesh conducting wire is inserted into the inside thereof. let

That is, in this invention, as shown in FIG. 7, a hollow cylindrical resin core material (37') is provided which is spirally wound concentrically with the axis of the cylinder (6). A mesh conductor (38') that is electrically connected to one end of the coil (16) of the linear motor (13) is inserted into the interior of the core material (3).
7') is concentrically coated with a mesh conducting wire (40) that is conductive to the other end of the coil (16), and the core material (37')
A pair of internal and external mesh conductors (38'), (40)
According to the invention of claim (5), in which the current-carrying lead wire (36') is characterized by An inner mesh conducting wire (38) connected to one end of the coil (16) is concentrically coated on a solid straight rod-shaped core material (37) made of plastic resin, and a coil ( 1
6) The outer mesh conductor (40) connected to the other end is covered concentrically with an insulating coating (39), and this integrated body is spirally formed into a cylinder (50) or the like having a predetermined diameter. The core material (37) is plastically deformed by being heated in that state to form a spiral current-carrying lead wire (36).

In addition, in the invention of claim (6), when manufacturing the linear motor energizing lead wire (36') in the invention of claim (4), as shown in FIG. (37'), an inner mesh conductor (38') connected to one end of the coil (16) is inserted, while an outer mesh conductor (38') connected to the other end of the coil (16) is inserted onto the core material (37'). A cylindrical body (50
), etc., and heat it in that state to form the core material (3
A spiral current-carrying lead wire (36') is formed by plastically deforming the wire (7').

(Operation) With the above configuration, in the invention of claim (1), the coil (
16) Power lead! (31), this lead wire (31) is connected to the piston spring (
30) and the mesh conductor wire (33) surrounding it, the piston spring (30) becomes a core material that is not only flexible but also maintains a constant shape against deformation, and the bending angle of the lead wire (31) is At the same time, the change in shape of the lead wire (31) due to the movement of the coil (16) also becomes constant, making it difficult for interference with surrounding fixed objects to occur (and making the lead wire (31) more uniform). Damage to the coating can be suppressed, thereby improving the durability and reliability of the compressor.

In addition, in the lead wire (31), since the mesh conductor wire (33) is arranged concentrically around the piston spring (30), the lead wire (31) can be easily routed, and its coil (16 ), and the lengths of the spring (30) and mesh conductor (33) can be made the same.

In this case, since the spring (30) constitutes a conductive path, a copper-based material with low electrical resistance (for example, a phosphor bronze spring) is used, but this copper-based material may reduce the spring constant. There is. Therefore, in order to set this spring constant to an appropriate value according to the natural frequency of the piston (7), it is necessary to change the diameter and number of turns of the spring (30), or adjust the mass of the piston (30) itself. It is desirable to do so.

Note that the mesh conductor (33) deforms as the spring (30) expands and contracts, but since its structure is made of fine conductor wires woven into a mesh shape, fatigue failure may occur in the mesh conductor (33) itself. There isn't.

In the invention of claim (2), the linear motor coil (16
The lead wire (31') to ) is composed of a conductive core material (35) and a mesh conductor wire (33), and the conductive core material (35) not only has flexibility but also maintains a constant shape without collapsing against deformation. In order to maintain this, the mesh conductor (33) covered with the core material (35) via the insulating sheathing material (32) changes uniformly with the core material (35) even when the coil (16) moves. Therefore, similar effects can be achieved.

In the invention of claim (3), the solid core material (37) made of resin in the lead wire (36) serves as a core material that maintains not only flexibility but also a constant shape against deformation, and a pair of mesh conductor wires ( 38), (40) are arranged, so these mesh conductors (38).

The shape change of (40) can be kept uniform, and the same effect can be obtained.

In the invention of claim (4), the lead wire (36') has a mesh conductor (38') inserted into the resin core material (37'), and a mesh conductor (40) arranged outside. Therefore, the shapes of both the mesh conductors (38') and (40) change in the same way as the core material (37'), and the same effect can be achieved.

In the invention of claim (5), the core material (37) in the form of a solid straight rod is covered with a pair of mesh conducting wires (38) and (40), and then spirally wound and plastically deformed by heating. When covering conductor i (38), (40),
It is only necessary to insert the straight rod-shaped core material (37) into the mesh conductor wires (38) and (40), and there is no need to take the trouble of covering the mesh conductor wire on the core material that has been previously plastically deformed into a spiral shape. Easy to manufacture.

Further, in the invention of claim (6), the hollow straight tube-shaped core material (3
The mesh conductor (38') is inserted into the mesh conductor (38'), and the core material (37') is covered with the mesh conductor (40), then spirally wound and plastically deformed by heating. '), (40) are easier to attach, and can be manufactured more easily than in the case where the core material is first plastically deformed into a spiral shape and then the mesh conducting wire is attached.

(First example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a compressor (1) for a Stirling refrigerator according to a first embodiment of the present invention, and this compressor (1) is combined with a conventionally known free displacer type expander (not shown) (see FIG. 8). They are combined to form a refrigerator. Compressor (1)
has a cylindrical casing (2), and this casing (
2) consists of a pair of left and right cylindrical casing assemblies (3), (3) having approximately the same configuration, arranged concentrically, and a disc-shaped center base (3) disposed between the two casing assemblies (3), (3). 4) are sandwiched in an airtight manner, and both casing assemblies (3), (3) and the center base (4) are made of pure iron. Above center base (4
) is formed with a cylinder insertion hole (5) in the center thereof,
The cylinder insertion hole (5) has a cylindrical cylinder (6) made of stainless steel as a non-magnetic material with both ends open.
) is inserted and supported. A pair of left and right pistons (7), (7) each having a substantially bottomed cylindrical shape are slidably fitted into this cylinder (6).
7) and (7) surrounded by the cylinder (6) is a compression chamber (11). Above center base (
4) is formed with a gas passage (12) that penetrates in the radial direction from the cylinder insertion hole (5) to the outer peripheral surface.
The inner end of the gas passage (12) communicates with the compression chamber (11) through a hole (6a) formed through the center of the cylinder (6), while the outer end of the gas passage (12) is connected to a connecting pipe (not shown). It is connected to an expander (not shown) via.

The left and right pistons (7), (7) are drivingly connected to linear motors (13), (13) serving as drive sources for reciprocating the pistons (7), (7), respectively. That is, each linear motor (13) is a cylindrical member (made of pure iron) fixed to the center base (4).
14), and this cylindrical member (14) is a cylinder (6).
The outer periphery of the casing assembly (3) is fitted to the inner periphery of the casing assembly (3) with a predetermined gap therebetween. An annular permanent magnet (15) is fixed to the outer periphery of the cylindrical member (14) with a predetermined gap from the inner periphery of the casing assembly (3). 14
), the center base (4) and the casing assembly (3) are used as yoke to generate a magnetic field of a predetermined strength in the gap between the magnet (15) and the inner peripheral surface of the casing assembly (3).

Each of the pistons (7) has a flange (7a) extending radially outward from the end opposite to the center of the cylinder (6) of the piston (7), and on the outer periphery of the flange (7a), It extends toward the center of the cylinder (6) concentrically with the piston (7), and its tip is disposed in the gap between the magnet (15) and the inner peripheral surface of the casing assembly (3) so as to be able to reciprocate in the left-right direction. A cylindrical bobbin (10) is connected, and the magnet (15) is attached to the outer periphery of the tip of this bobbin (10).
) A coil (16) is wound at a position opposite to the coil (16).

By energizing the coils (16), (16) of both linear motors (13), (13) in synchronization with an alternating current of a predetermined frequency, both pistons (7), (7) are connected to the piston springs (described later). 30) are configured to reciprocate in opposite directions at a period determined by the spring constant of 30) to generate gas pressure at a predetermined period in the compression chamber (11).

A spring assembly (
The outer end of 20) is fastened with a bolt (21).

This spring assembly (20) extends toward the center of the casing assembly (3), and a spring holder upper (22) is attached to the inner end of the spring assembly (20) with an adjustment screw (20).
25), it is attached movably in the cylinder axis direction (left and right direction). This spring holder upper (22) has a cylindrical portion (22a);
A spiral spring mounting groove (23) is formed on the outer periphery of 2a). Further, a spring holder lower (26) as a spring mounting member is screwed and fastened to the center of the inner bottom surface of each piston (7), and a spiral spring mounting groove (28) is formed on the outer periphery of this spring holder lower (26).
) is formed. In the spring mounting groove (23) of the spring holder upper (22), one end of a coil spring or a bellowing piston spring (30) made of a material with low electrical resistance is spirally wound concentrically with the cylinder (6). The other end of this spring (30) is immovably attached to the spring mounting groove (28) on the outer periphery of the spring holder lower (26), and this spring (30) allows the piston (
7) is elastically supported by the casing (2) so that it can reciprocate in the left-right direction.

Further, a current-carrying lead wire (31) is provided for supplying power to the coil (16) of the linear motor (13). As shown in enlarged detail in FIG. 2, this current-carrying lead wire (3) includes the spring (30), a tubular inner insulation coating (32) covered with the spring (30), and the The spring (3) is placed on the insulation covering (32).
The mesh conductor wire (33) is made of a good conductor wire and is coated concentrically with the mesh conductor wire (33), and an outer insulating coating material (34) is coated on the mesh conductor wire (33).

The mesh conductor (33) is made of a wire made of copper or the like, which is thin enough not to cause fatigue damage even if the spring (30) expands and contracts with the reciprocation of the piston' (7), and has low electrical resistance. It is knitted into a hollow cylindrical shape, and the spring (30) is inserted into the hollow part so that the spring (30) is covered with a mesh conducting wire (33). Although not shown in detail, the above spring (3
0) on the piston (7) side is connected to the linear motor (1).
At one end of the coil (16) of 3), there is also a spring (30
) The piston (7) of the mesh conductor (33) covered with
The side ends are each connected to the other end of the coil (16). On the other hand, the spring (30) and the mesh conductor (
33) on the casing (2) side are each connected to an AC power source (not shown) outside the casing (2).

Therefore, the spring (30) and the mesh conductor (33)
coil (16) of linear motor (13) respectively.
An energizing path is formed for this spring (30
) and the mesh conductor (33) to supply power to the coil (16).

Next, the operation of the above embodiment will be explained.

With the start of operation of the refrigerator, both linear motors (13) in the compressor (1), the coils (16) of (13),
At (16), an AC power source of a predetermined frequency is energized synchronously. With this energization, the coils (16), (16)
and a piston (7).

(7) reciprocates in opposite directions while expanding and contracting the springs (30) and (30), and both pistons (7)
, (7) move toward and away from each other within the cylinder (6), the volume of the compression chamber (11) increases or decreases, and the compression chamber (11)
A pressure wave with a predetermined period is generated within the chamber.

This compression chamber (11) is in communication with the expander via the coupling pipe, so in the expander the displacer is connected to the compression chamber (11).
The displacer reciprocates with the same frequency as the pressure wave in step 11), and the expansion of the gas in the expansion chamber causes cooling, and the cold head at the tip of the cylinder is cooled to an extremely low temperature level by the reversal of the reciprocating movement of the displacer.

In this embodiment, each piston (7) of the compressor (1)
The piston spring (30) elastically supports the covering material (
covered with a mesh conductor (33) via a mesh conductor (32);
Each end of this spring (30) and mesh conductor (33) is connected to a coil (16) of a linear motor (13).
Since the coil (16) is electrically connected to the spring (
30) and the mesh conductor 491 (3B) around it. At this time, the energizing lead wire (31) to the coil (16) is composed of the piston spring (30) and the mesh conductor wire (33) around it, so the piston spring (30) is not only flexible but also resistant to deformation. On the other hand, it becomes the core material that maintains a certain shape, and the lead wire (31)
The bending angle is the same in all parts. Moreover, the change in shape of the lead wire (31) due to the movement of the coil (16) becomes constant, making it difficult for interference with surrounding fixed objects to occur, thereby suppressing damage to the coating of each lead wire (31). Therefore, the durability and reliability of the compressor (1) can be improved.

In addition, since the lead wire (31) has a mesh conducting wire (33) arranged concentrically around the piston spring (30), the lead wire (31) can be easily routed and Connection to the coil (16) is also facilitated. Moreover, the mesh conductor (33) is connected to the spring (30).
can be the same length.

At that time, the mesh conductor (33) is made of fine conductor wires woven into a mesh shape, so the spring (30)
Even if the mesh conductor (33) is deformed due to expansion and contraction, fatigue failure will not occur in the mesh conductor (33) itself.

(Second Embodiment) FIGS. 3 and 4 show a second embodiment of the present invention. In each of the following embodiments, the same parts as in FIGS. 1 and 2 are denoted by the same reference numerals. (Detailed explanation thereof will be omitted), and a current-carrying lead wire (31') is arranged separately from the piston spring (30).

That is, in this embodiment, the spring holder upper (22) has a flange part (22b) integrally attached to the outer periphery of the cylindrical part (22a), and the cylinder (6) of the flange part (22b) ) An annular groove (24) centered on the cylinder axis is recessed in the center side surface. Further, on the bottom wall of the bobbin (10) of the linear motor (13), an annular groove (29) is formed on the surface facing the flange portion (22b) of the spring holder upper (22), corresponding to the annular groove (24). is recessed.

And, between both of these annular grooves (24) and (29), a current-carrying lead wire (31') wound concentrically with the cylinder (6) has its ends connected to the annular grooves (24) and (29), respectively.
9) The hook is passed in a state where it is fitted and engaged. As shown in enlarged detail in FIG. 4, this current-carrying lead wire (31') is equipped with a conductive core material (35) that is spirally wound concentrically with the axis of the cylinder (6). 35) is electrically connected to one end of the coil (16) of the linear motor (13), and constitutes one current-carrying path to the coil (16).

Further, similarly to the first embodiment, the conductive core material (35
) is coated with a tubular inner insulating sheath (32), and on top of this inner insulating sheath (32) is a mesh conductor (
33) are coated concentrically, and an outer insulation sheath (34) is coated thereon. The mesh conducting wire (33) is electrically connected to the other end of the coil (16) and constitutes the other energizing path of the coil (16), and the mesh conducting wire (33) is connected to the conductive core material (35) and the mesh conducting wire (33). The coil (16) is energized by the coil (16).

The rest of the structure is the same as that of the first embodiment.

Therefore, in this embodiment, even if the conductive core material (35) deforms as the coil (16) moves, its bending angle remains constant, and the change in shape caused by the movement of the coil (16) remains constant. It becomes the heartwood that sag.

The mesh conducting wire (33) is concentrically covered with the core material (35) via the insulating covering material (32).
) moves, it changes uniformly following the core material (35), so the same effects as in the first embodiment can be achieved.

(Third Embodiment) FIGS. 5 and 6 show a third embodiment. In the second embodiment, the annular groove (24) of each spring holder upper (22) and the flange portion ( The current-carrying lead wire (7a) is locked and fixed between the annular groove (29)
31') with a different configuration (in addition, the compressor (1)
Since the basic configuration of the second embodiment is the same as that of the second embodiment, FIG. 3 will be used for the explanation).

That is, in this embodiment, the current-carrying lead wire (36) to the coil (16) of each linear motor (13) in the compressor (1) is concentric with the axis of the cylinder (6), as shown in FIG. A core material (37) in the shape of a solid round rod made of a thermoplastic resin such as Teflon resin is spirally wound, and an inner mesh conducting wire (38) is concentrically covered with the core material (37). This mesh conductor (38) is coated with a tubular inner insulating sheath (39), on which the outer mesh conductor (40) is concentrically coated, and on top of that is the outer insulating sheath (39). 41) is coated. The inner mesh conductor (38) is connected to the coil (16).
The outer mesh conductor (40) is electrically connected to one end, and the outer mesh conductor (40) is electrically connected to the other end.
), (40), the coil (16) is energized.

When manufacturing the current-carrying lead wire (36), first, an inner mesh conducting wire (38) connected to one end of the coil (16) is attached to a straight rod-shaped core material (37) made of thermoplastic resin.
An outer mesh conductor (40) connected to the other end of the coil (16) is concentrically coated on the inner mesh conductor (38) via an inner insulating covering material (39). , further coated with an outer insulating coating (41).

Next, as shown in FIG. 6, these integral parts are spirally wound around, for example, a cylindrical steel pipe (50) having a predetermined diameter, and heated in that state to plastically deform the core material (37), thereby forming a spiral shape. A shaped current-carrying lead wire (36) is formed.

Therefore, in this embodiment, the resin core material (37) is plastically deformed in a spiral shape due to its heat molding, so even if it deforms as the coil (16) moves, the bending angle is uniform and the shape is It becomes a heartwood that remains constant despite changes. Therefore,
Inner and outer mesh conductor wires (38) concentrically coated on this core material (37) with an insulating sheathing material (39) interposed therebetween;
(40) is the core material (37) even if the coil (16) moves.
), and thus the same effects as in the first embodiment can be achieved.

In addition, when manufacturing such a current-carrying lead wire (36), the straight bar-shaped core material (37) is covered with mesh conducting wires (38) and (40) and then bent into a spiral shape, so that the core material (37) is bent into a spiral shape. ) to the mesh conductor (38),
The covering operation of (40) is facilitated, making it easy to manufacture and mass production possible.

(Fourth Embodiment) FIG. 7 shows a fourth embodiment. In the third embodiment, both mesh conductors (38) and (40) are connected to the core material (37).
In contrast, the core material (37') is formed into a hollow cylindrical shape, and one mesh conducting wire (38') is inserted through the core material (37').

That is, in this embodiment, the current-carrying lead wire (36') has a hollow cylindrical shape made of thermoplastic resin such as Teflon resin and is spirally wound concentrically with the axis of the cylinder (6) of the compressor (1). This heartwood (37') is provided with a heartwood (37') of
An inner mesh conducting wire (38') is inserted therein. On the other hand, the outer mesh conductor (40
) are coated concentrically, and on top of that is an insulating coating (41).
is covered. Then, the inner mesh conductor (3
8') is connected to one end of the coil (16), and the outer mesh conductor (40) is connected to the other end of the coil (16), so that both the inner and outer mesh conductors (38') are connected.

(40) energizes the coil (16).

The method of manufacturing the current-carrying lead wire (36') is the same as that of the third embodiment (see Fig. 6). First, one end of the coil (16) is placed inside the hollow straight tube-shaped core material (37'). The inner mesh conductor (38') connected to the inner mesh conductor (38') is inserted concentrically. Further, an outer mesh conducting wire (40) connected to the other end of the coil (16) is concentrically coated on the core material (37'), and an insulating coating material (41) is further coated thereon. Thereafter, these integral parts are spirally wound around a cylindrical steel pipe (50) and heated in that state to plastically deform the core material (37'), thereby forming a spiral current-carrying lead wire (36').
') to form.

Therefore, this embodiment can also provide the same effects as the third embodiment.

In each of the above embodiments, there are two pistons (7), two linear motors (13), etc., but the present invention can also be applied to a compressor equipped with one of these.

(Effects of the Invention) As explained above, according to the invention of claim (1), in a linear motor compressor for a Stirling refrigerator, the current-carrying lead wire that supplies power to the coil of the linear motor is connected to the piston of the compressor. It consists of a coil spring that provides elastic support, and a mesh conductor that is concentrically covered with the spring through an insulating coating. Further, in the invention as claimed in claim (2), one current-carrying path to the coil of the linear motor is constructed of a conductive core material, and the core material is covered with a mesh conducting wire that constitutes the other current-carrying path. Furthermore, in the invention of claim (3), the core made of resin is covered with a pair of mesh conducting wires with an insulating coating material interposed therebetween, and these mesh conducting wires are respectively used as current-carrying paths of the coil. Moreover, in the invention of claim (4), a mesh conducting wire is inserted into the inside of the hollow core material, the outside is covered with the mesh conducting wire, and both mesh conducting wires are respectively used as current-carrying paths of the coil.

Therefore, according to these inventions, the mesh conductor wire serving as the current-carrying path to the linear motor coil is supported by a spring or core material, and this spring or core material not only has flexibility but also maintains a constant state without collapsing against deformation. Since the shape is maintained, even if the coil moves due to the operation of the linear motor compressor, the mesh conductor can be uniformly changed along with the spring or core material, making it possible to manage the lead wire even in a narrow space. This makes it possible to prevent damage caused by interference with surrounding fixed objects, thereby improving the durability and reliability of the compressor.

Further, in the invention of claim (5), in manufacturing the linear motor current-carrying lead wire according to the invention of claim (3), a straight bar-shaped core material is covered with a pair of mesh conductive wires, and then wound spirally. We decided to plastically deform it by heating.

In addition, in the invention of claim (6), in manufacturing the linear motor current-carrying lead wire according to the invention of claim (4), a mesh conductor is inserted into a hollow straight tube-shaped core material, and the mesh conductor wire is inserted into the core material. After coating the material with a polyurethane resin, the material was wound into a spiral shape, and the material was plastically deformed by heating. Therefore, according to these inventions, metal is applied to the core material which has been previously plastically deformed in a spiral shape.
There is no need for the labor involved in inserting or covering the tush conductor, and the current-carrying lead wire can be easily manufactured and mass-produced.

[Brief explanation of the drawing]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a sectional view of the compressor, and FIG. 2 is an enlarged perspective view showing a partially broken energizing lead wire to the linear motor coil. It is. Third
3 and 4 show a second embodiment, FIG. 3 is a sectional view of a main part of the compressor, and FIG. 4 is a view corresponding to FIG. 2. 5 and 6 show the third embodiment, and FIG. 5 is a diagram corresponding to FIG. 2, and FIG. 6 is a diagram corresponding to FIG.
The figure is a perspective view showing a method of manufacturing a linear motor current-carrying lead wire. FIG. 7 is a diagram corresponding to FIG. 2 showing the fourth embodiment. FIG. 8 is a sectional view showing a conventional example of a Stirling refrigerator. (1)...Compressor (2)...Casing (6)...Cylinder (7)...Piston (11)...Compression chamber (13)...Linear motor (15)...・Magnet (16)...Coil (30)...Piston spring (31), (31')...Electric lead wire (32)
)... Insulation coating material... Mesh conductor wire... Conductive core material, (36')... Current carrying lead wire, (37')... Resin core material, (38')... Mesh conductor wire ... Insulation coating material ... Mesh conductor ... Steel pipe (cylindrical body) Fig. 4 (1) ... Compressor (2) ... Casing (6) ... Urinda (7) ... Piston (11)...Compression chamber (13)...Linear motor (15)...Magnet...Steel pipe (cylindrical body) Fig. 2

Claims (1)

[Scope of Claims] (1) A casing (2), a cylinder (6) provided in the casing (2), and a cylinder (6) fitted in the cylinder (6) so as to be able to reciprocate. Compression chamber (1
1), a piston (7) defining a section;
) can be reciprocated within the cylinder (6).Casing (2)
It has a piston spring (30) made of a coil spring that elastically supports the coil, a magnet (15), and a coil (16), and an alternating current of a predetermined frequency is supplied to the coil (16) through a current-carrying lead wire (31). and a linear motor (13) that reciprocates the piston (7), and the piston spring (30) is connected to the coil (16).
The piston spring (30) is electrically connected to one end, and the piston spring (30) is covered concentrically with a mesh conductor (33) that is electrically connected to the other end of the coil (16) via an insulating covering material (32).
The piston spring (30) and the mesh conductor (3)
3) A linear motor compressor for a Stirling refrigerator, characterized in that the current-carrying lead wire (31) is configured by the following. (2) A casing (2), a cylinder (6) provided in the casing (2), and a compression chamber (6) fitted in the cylinder (6) so as to be reciprocally movable in the cylinder (6). 1
1), a piston (7) defining a section;
) can be reciprocated within the cylinder (6).Casing (2)
It has a piston spring (30) consisting of a coil spring that elastically supports the piston spring, a magnet (15) and a coil (16), and an alternating current of a predetermined frequency is supplied to the coil (16) through a current-carrying lead wire (31'). The linear motor (13) is provided with a linear motor (13) that reciprocates the piston (7), and the energizing lead wire (31') is spirally wound concentrically with the axis of the cylinder (6).
a conductive core (35) electrically connected to one end of the coil (16);
and a mesh conducting wire (33) which is concentrically coated on the conductive core material (35) via an insulating covering material (32) and is electrically connected to the other end of the coil (16). Linear motor compressor for Stirling refrigerators. (3) A casing (2), a cylinder (6) provided in the casing (2), and a compression chamber (6) fitted in the cylinder (6) so as to be reciprocally movable in the cylinder (6). 1
1), a piston (7) defining a section;
) can be reciprocated within the cylinder (6).Casing (2)
It has a piston spring (30) made of a coil spring that elastically supports the coil, a magnet (15), and a coil (16), and an alternating current of a predetermined frequency is supplied to the coil (16) through a current-carrying lead wire (36). It is equipped with a linear motor (13) that reciprocates the piston (7), and the current-carrying lead wire (36) is connected to a resin solid core material (37) spirally wound concentrically with the axis of the cylinder (6). )and,
An inner mesh conducting wire (38) is concentrically coated on the core material (37) and is electrically connected to one end of the coil (16) of the linear motor (13), and an insulating coating material (39) is provided on the mesh conducting wire (38). It is coated concentrically with the core material (37) through the
The outer mesh conductor (4) conducts to the other end of the coil (16).
0) A linear motor compressor for a Stirling refrigerator, comprising: (4) A casing (2), a cylinder (6) provided in the casing (2), and a compression chamber (6) fitted in the cylinder (6) so as to be reciprocally movable in the cylinder (6). 1
1), a piston (7) defining a section;
) can be reciprocated within the cylinder (6).Casing (2)
It has a piston spring (30) made of a coil spring that elastically supports the piston spring (30), a magnet (15) and a coil (16), and an alternating current of a predetermined frequency is supplied to the coil (16) through a current-carrying lead wire (36'). and a linear motor (13) that reciprocates the piston (7). A core material (37'), an inner mesh conductor (38') inserted into the core material (37') and electrically connected to one end of the coil (16) of the linear motor (13), and a core material (37').
A linear motor compressor for a Stirling refrigerator, characterized in that the linear motor compressor for a Stirling refrigerator is provided with an outer mesh conducting wire (40) which is concentrically covered with the coil (16) and is electrically connected to the other end of the coil (16). (5) A method for manufacturing a current-carrying lead wire that supplies power to a coil (16) of a linear motor (13) in a linear motor compressor for a Stirling refrigerator, the method comprising: a solid straight rod-shaped core material (37) made of thermoplastic resin; ), an inner mesh conductor (38) connected to one end of the coil (16) is concentrically coated, and an outer mesh conductor (38) connected to the other end of the coil (16) is coated on the inner mesh conductor (38). The mesh conductor (40) is concentrically coated with an insulating coating (39), and this integrated body is spirally wound around a cylindrical body (50) having a predetermined diameter, and heated in that state to form a core material. A method for manufacturing a linear motor current-carrying lead wire, characterized in that a spiral current-carrying lead wire (36) is formed by plastically deforming (37). (6) A method for manufacturing a current-carrying lead wire that supplies power to a coil (16) of a linear motor (13) in a linear motor compressor for a Stirling refrigerator, the method comprising: a straight tube-shaped core material (37') made of thermoplastic resin; ), an inner mesh conductor (38') connected to one end of the coil (16) is inserted, while an outer mesh conductor (38') connected to the other end of the coil (16) is inserted over the core material (37'). 40
) are concentrically wrapped around a cylinder (50) having a predetermined diameter, and heated in that state to plastically deform the core material (37').
A method for manufacturing a linear motor current-carrying lead wire, which comprises forming a spiral current-carrying lead wire (36').