JPH11159901A - Vibration type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the wiring structure of a lead wire through which a current is supplied to each coil, in a vibration type compressor having a bobbin provided with a drive coil for driving a piston and an auxiliary coil for setting a piston neutral position. SOLUTION: A drive coil and a pair of auxiliary coils are wound around a bobbin connected to a piston. A current introduction terminal arranged at a housing and each coil are interconnected through lead wires 23, 24, and 24. Guide plates 41, 42, and 43 to form guide passages β-1-γ-3 for guiding a lead wire are attached to the back of a bobbin and the inner surface of a housing. The Guide passages β-1-γ-3 are different in diameter from each other and by individually inserting the lead wires 23, 24, 24 in the guide passages β-1-γ-3, the lead wires 23, 24, and 24 are different in diameter and spirally wired in the same direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration type in which gas supplied to an expander is compressed by reciprocation of a piston in a Stirling refrigerator or the like having an expander that generates cryogenic temperature by reciprocating a displacer. The present invention relates to a compressor, and more particularly, to an improvement in a wiring structure of a lead wire for supplying a current to a drive unit for reciprocating a piston.

[0002]

2. Description of the Related Art Conventionally, a free displacer type Stirling refrigerator is known as a kind of a small refrigerator which generates cryogenic temperature. This refrigerator is configured by combining a vibration type compressor for compressing gas and an expander for expanding gas discharged from the compressor.

As the vibration type compressor, for example, Japanese Patent Laid-Open No.
As shown in JP-A-174321, an opposed piston type (double piston type) is known. As shown in FIG. 14, this opposed-piston type compressor has a hermetically sealed housing (101), a cylinder (103) disposed in the housing (101), and a reciprocating cylinder in the cylinder (103). The compression space (10
8) is provided with a pair of pistons (107, 107) for partitioning 8), and linear motors (115, 115) as drive sources for reciprocatingly driving the pistons (107, 107). In addition, the compression space (108)
Is connected to the expander via a gas passage (109) and a connecting pipe (not shown). Each of the linear motors (115) has a drive magnet (116) formed of an annular permanent magnet disposed around the cylinder (103).
A magnetic field is generated in a cylindrical space (magnetic gap) concentric with the center of 3). In this space, the piston (1
A bobbin (117) integrally fixed to the bobbin (117) is provided, and a drive coil (11
8) is wound. The drive coil (118) is supplied with an alternating current from a lead wire (119), and one end of the lead wire (119) is connected to a current introduction terminal (120, 120) provided on the housing (101). doing. Also,
A coil spring (125) for elastically supporting the piston (107) in a reciprocating manner is provided between the rear side of each of the pistons (107) and the inner wall surface of the housing (101).

By supplying an alternating current of a predetermined frequency from a lead wire (119) to a driving coil (118) of a linear motor (115),
The bobbin (117) is driven by an electromagnetic force acting between a current flowing through the drive coil (118) and a magnetic field passing through the space by the magnet (116).
And both pistons by driving the piston (107) integral with it
(107, 107) are reciprocated in the cylinder (103) so as to approach and separate from each other. As a result, a predetermined period of gas pressure is generated in the compression space (108).

On the other hand, although not shown, the expander has a cylindrical cylinder, in which a free displacer for partitioning the inside of the cylinder into an expansion space and a working space is fitted reciprocally. The displacer is filled with a regenerator (regenerative heat exchanger), and the regenerator communicates with the expansion space and the working space, respectively. A coil spring for elastically supporting the displacer so as to be able to reciprocate is disposed in the working space. Further, the working space is connected to the compression space (108) of the compressor via the connection pipe, and the gas is expanded in the expansion space by reciprocating the displacer by gas pressure from the compressor.
Cold is generated in the cold head at the tip of the cylinder.

[0006]

By the way, the inventor of the present invention proposes that the neutral position of the piston is set to an appropriate position by electromagnetic force. In particular,
An auxiliary coil is wound around both sides of the drive coil (both front and rear sides in the reciprocating direction of the piston) around the bobbin. Thus, when a direct current is supplied to the auxiliary coil when the piston reciprocates, the current acts on the magnetic field generated by the driving magnet, and an electromagnetic force is generated to return the piston to the neutral position. In other words, the piston is reciprocated with the predetermined neutral position as the center position of the reciprocation, and as a result, a coil spring for supporting the piston is not required, or a coil spring having an extremely low spring constant can be adopted. A proposal has been made (Japanese Patent Application No. 9-229717).

[0007] The connection form of the lead wire to the bobbin in the conventional vibration type compressor is as follows.
Only the kind of lead wire was connected. For this reason, if the wiring structure of the lead wire is directly applied to the compressor employing the auxiliary coil, a direct current cannot be supplied to the auxiliary coil. Therefore, in order to make the drive coil and the auxiliary coil coexist in this way, it is necessary to improve the wiring structure for supplying current.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vibration type compressor in which a driving unit includes a driving coil for driving a piston and an auxiliary coil for setting a neutral position of the piston. Another object of the present invention is to provide a wiring structure of a lead wire capable of supplying a current to each coil.

[0009]

In order to achieve the above object,
According to the present invention, a driving lead wire for supplying an alternating current to the drive coil and an auxiliary lead wire for supplying a DC current to the auxiliary coil are connected to the bobbin provided with the driving coil and the auxiliary coil. Thus, current can be individually supplied to each coil.

Specifically, as shown in FIG. 1, the invention according to claim 1 is fixed in a housing (1), has a piston fitting hole (11), and drives a linear motor (15). magnet
(16) Fixed side member that forms the magnetic path of the magnetic circuit generated by
(3) and a piston (7) fitted in the piston fitting hole (11) to form a compression space (8) between the fixed side member (3) and the piston (7).
And a bobbin (17) provided with a drive coil (18) of a linear motor (15) arranged integrally with the piston (7) and arranged in the magnetic circuit, wherein the drive coil (18 ) To drive the linear motor (15) to reciprocate the piston (7) together with the bobbin (17) with respect to the fixed member (3), and to cycle gas in the compression space (8). It is premised on a vibration-type compressor which is designed to perform compression. Then, an auxiliary coil (28, 28) that supplies a direct current and applies an electromagnetic force to the piston (7) so as to urge the piston (7) to the reciprocating neutral position by the action of the magnetic field of the magnetic circuit is provided to the bobbin (1).
Provided in 7). The bobbin (17) has a drive coil (18)
The drive lead wire (23) for supplying current to the
8, 28) are connected to auxiliary lead wires (24, 24) for supplying current.

According to this specific matter, the driving lead wire (23)
When an alternating current is supplied to the drive coil (18), the linear motor (15) is driven, and the piston (7) reciprocates with the bobbin (17) with respect to the fixed side member (3) to move in the compression space (8). The gas will be compressed periodically. At this time, the auxiliary coil (28,2
8) is supplied with DC current from the auxiliary lead wires (24, 24), and acts on the piston (7) by the action of the magnetic field of the magnetic circuit.
, An electromagnetic force that urges the neutral position of the reciprocating movement. Therefore, the piston (7) reciprocates with the appropriate neutral position as the center position of the reciprocation.
In this way, the bobbin (17) has a plurality of leads (23, 24, 2).
By connecting 4), it is possible to supply current suitable for each coil (18, 28, 28).

According to a second aspect of the present invention, each lead wire (23, 2
The wiring configuration of (4, 24) is a configuration in which the bobbin (17) reciprocates. Specifically, in the vibration type compressor according to claim 1, the housing (1)
In addition, an AC current introduction terminal (22) and a DC current introduction terminal (2
9,29). Connect one end of the drive lead wire (23) to the bobbin (1
One end of the auxiliary lead wire (24, 24) is connected to the auxiliary coil (28, 28) of the bobbin (17) to the drive coil (18) of (7). After taking out each lead wire (23, 24, 24) from the bobbin (17), it is extended toward the current introduction terminal (22, 29, 29) in a spiral around the axis of the bobbin (17). , Drive lead wire
The other end of (23) is connected to the AC current introduction terminal (22), and the other end of the auxiliary lead wire (24, 24) is connected to the DC current introduction terminal (29, 29).

According to this specific matter, when the bobbin (17) reciprocates, no local deformation occurs in each of the lead wires (23, 24, 24), and no local stress is concentrated. As a result, the lead wires (23, 24, 24) are disconnected during the operation of the compressor, or the connection parts of the coils (18, 28) and the current introduction terminals (22, 29) are disconnected. It is possible to prevent a situation in which supply cannot be performed.

According to a third aspect of the present invention, the lead wire (23, 24, 2
4) specifies a specific configuration for spirally wiring. That is, in the vibration type compressor according to the second aspect, each lead wire (23, 24, 2) is provided on the back side of the bobbin (17).
Guide member (4) forming a guide passage (α, β, γ) for spirally guiding the current guide terminal 4) toward the current introduction terminals (22, 29, 29).
1, 42, 43).

According to this specific matter, each lead wire (23, 24, 2
4) is guided in the guide passages (α, β, γ) formed by the guide members (41, 42, 43), and thereby, the current introduction terminals (2
2,29,29).

The invention according to claims 4 to 7 is characterized in that each lead wire (2
3, 24, 24) is specified in the form of a wiring when spirally wiring. That is, the invention according to claim 4 is the vibration type compressor according to claim 3, wherein the guide members (41, 42, 43)
Is a guide passage for guiding the driving lead wire (23) and the auxiliary lead wire (24, 24) in a spiral shape in the same direction with different diameters from each other.
(α, β, γ).

According to a fifth aspect of the present invention, in the vibration type compressor according to the third aspect, the guide member (41, 42, 43) comprises a driving lead wire (23) and an auxiliary lead wire (24, 24). Are formed so as to form guide passages for guiding spirally in different directions with different diameters.

According to a sixth aspect of the present invention, in the vibration type compressor according to the third aspect, the guide member (41, 42, 43) comprises a driving lead wire (23) and an auxiliary lead wire (24, 24). ) Are formed so as to form a guide passage that spirally guides in the same direction with the same diameter.

According to a seventh aspect of the present invention, in the vibration type compressor according to the third aspect, the guide member (41, 42, 43) comprises a driving lead wire (23) and an auxiliary lead wire (24, 24). Are formed so as to form a guide passage for guiding spirally in different directions with the same diameter.

According to these specific items, each lead wire (23, 2
4, 24) can be embodied. In particular, in the inventions according to claims 4 and 5, since the respective lead wires (23, 24, 24) are helically wired with different diameters, the respective lead wires (23, 24, 24)
Contact between them can be avoided, and problems such as disconnection do not occur.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS -Description of Overall Configuration of Compressor- FIG. 1 shows a vibrating compressor (A) for a Stirling refrigerator according to an embodiment of the present invention. The compressor (A) constitutes a refrigerator in combination with a conventionally known free displacer type expander (not shown).

The compressor (A) has a closed cylindrical housing (1) extending horizontally and horizontally. This housing (1)
Is a cylindrical wall (1a) having a center line in the left-right direction, and a disk wall (1a) for airtightly closing both ends of the cylindrical wall (1a).
b, 1b). In the housing (1), fixed side members
(3) and a movable member (20) having a pair of pistons (7, 7) forming a compression space (8) between the fixed side member (3) are accommodated.

The fixed side member (3) of the present embodiment includes a yoke member (4),
The cylinder member (5) and the pair of magnet support members (6, 6) are integrally assembled.

The yoke member (4) is a substantially cylindrical member whose outer peripheral surface is fixed to the inner surface of the cylindrical wall (1a) of the housing (1). This yoke member (4) has a large-diameter portion (4a) abutting on the inner surface of the cylindrical wall portion (1a) and a small-diameter portion (4b) located at a substantially central portion in the axial direction.
And a pair of connecting portions (4c, 4c) for connecting the large diameter portion (4a) and the small diameter portion (4b). The inner diameter of the small diameter portion (4b) is set to be larger than the outer diameter of the piston (7) by a predetermined dimension. In addition, one end edge (left edge in FIG. 1) of the inner peripheral surface of the small diameter portion (4b) in the axial direction protrudes toward the inner peripheral side and has a protrusion (5) of a cylinder member (5) described later.
An abutting portion (4d) to which a) can abut is formed. The inner diameter of the contact portion (4d) is set slightly larger than the outer diameter of the piston (7). As a result, the yoke member (4) has a recessed portion (4e) formed by the small diameter portion (4b) and the contact portion (4d).

The cylinder member (5) is a cylindrical member whose inner diameter dimension substantially matches the outer diameter dimension of the piston (7). The outer diameter of the cylinder member (5) matches the inner diameter of the contact portion (4d) of the yoke member (4). A projection (5a) is formed at a substantially central portion in the axial direction of the cylinder member (5).
The outer diameter of the protruding portion (5a) matches the inner diameter of the small diameter portion (4b) of the yoke member (4).

Each magnet support member (6, 6) is a cylindrical member that supports a drive magnet (16, 16) of each linear motor (15, 15) described later. The inner diameter of the magnet support member (6) matches the outer diameter of the cylinder member (5). The outer diameter of the magnet support member (6) is larger than that of the yoke member (4).
It is set so as to have a predetermined interval between the inner surface of (4a). A driving magnet (16) is provided on the outer peripheral surface of the magnet support member (6).
A step (6a) is formed to support the step. In particular, at one end edge (left edge in FIG. 1) of the right magnet support member (6) in FIG.
Projection (5a) of cylinder member (5) between contact portion (4d) of (4)
Is integrally formed with a holding portion (6b) for holding the sheet. The outer diameter of the holding portion (6b) is smaller than the small diameter portion (4
It matches the inner diameter of b).

The shape of each member (4, 5, 6) is set as described above, and the protrusion (5a) of the cylinder member (5) has a contact portion (4d) of the yoke member (4). The magnet support member (6) on the right side has a holding portion (6b) and a protrusion (5a) of a cylinder member (5) and a contact portion (4d) of a yoke member (4). To the cylinder member (5) and the yoke member (4). That is, the protrusion (5a) of the cylinder member (5) is in contact with the contact portion (4d) of the yoke member (4) and the holding portion (6) of the magnet support member (6).
b). Thus, the fixed side member (3) is formed, and the piston fitting hole (11) is formed inside the cylinder member (5).

The yoke member (4) and the magnet support member
(6) is made of a magnetic material such as pure iron and constitutes a yoke (yoke) for forming a magnetic circuit. On the other hand, the cylinder member (5) is made of a sliding material that reduces the coefficient of friction with the piston (7).

A pair of substantially cylindrical left and right pistons (7, 7) are slidably fitted in the cylinder member (5) with their distal ends facing each other. The portion surrounded by the cylinder member (5) between 7) is a compression space (8). A gas passage (9) penetrating in the radial direction is formed in a part of the protrusion (5a) of the cylinder member (5).
The inner end of the gas passage (9) is always in communication with the compression space (8). Also, the cylindrical wall portion (1a) of the housing (1) and the yoke member
One end of the communication pipe (10) is inserted into the small diameter part (4b) of (4),
The communication pipe (10) communicates with the gas passage (9). Thus, the compression space (8) communicates with an expander (not shown) via the communication pipe (10). Also, an O-ring is provided between the end of the connecting pipe (10) and the cylinder member (5) to prevent fluid leakage from between the outer peripheral surface of the connecting pipe (10) and the cylinder member (5). doing. The connecting pipe (10) is provided with a flange (10a), and the flange (10a) is
(1) is in contact with the outer peripheral surface of the cylindrical wall portion (1a). An O-ring is also provided at this abutting portion to prevent fluid leakage.

The left and right pistons (7, 7) are drivingly connected to linear motors (15, 15) as driving sources for reciprocating the respective pistons (7, 7). Each linear motor (1
5) has a driving magnet (16) composed of an annular permanent magnet fitted and fixed to the step (6a) of the magnet supporting member (6), and includes a magnet supporting member (6) and a yoke member (4). ) As a drive magnet (16)
A magnetic field of a predetermined strength (static magnetic field) in the magnetic gap consisting of the space between the outer peripheral surface and the inner peripheral surface of the large diameter portion (4a) of the yoke member (4)
Generate.

Each of the pistons (7) has a flange portion (7a) extending radially outward from the rear side, that is, the end opposite to the center of the fixed member (3). A cylindrical bobbin (17) serving as a drive unit of the linear motor (15) is integrally connected to the outer periphery of the flange portion (7a) at the base end thereof. Specifically, with respect to the disc-shaped piston mounting surface (17a) formed at the base end of the bobbin (17), the flange portion (7a ) Are superimposed, and both are screwed. The outer diameter of this piston mounting surface (17a) is
It is set slightly larger than the outer diameter of (7a).

The bobbin (17) extends concentrically with the piston (7) toward the center of the housing, and has a distal end formed with the drive magnet (1).
6) It is arranged in a magnetic gap between the outer peripheral surface and the inner peripheral surface of the large diameter portion (4a) of the yoke member (4) so as to be able to reciprocate in the left-right direction.
A drive coil (18) composed of an electromagnetic coil is wound around the outer periphery of the bobbin (17) near the front end at a position corresponding to the drive magnet (16). And the bobbin (17) and the piston (7)
The movable member (20) is constituted by the movable member (20) including the entire movable portion such as the drive coil (18) and an auxiliary coil (28) described later. Relative movement is allowed. Each drive coil (18) is connected to a lead wire (23) for supplying an alternating current, and the lead wire (2
One end of 3) is connected to a drive AC power supply (not shown) via a pair of drive current introducing terminals (22) which are supported in a state of being insulated from each disk wall (1b) of the housing (1). As a result, an AC of a predetermined frequency is supplied from the driving AC power supply via the respective driving current introduction terminals (22) and the lead wires (23) in synchronization with the driving coils (18, 18) of the linear motors (15, 15). By doing so, the pistons (7, 7) are reciprocated in the opposite direction so as to approach and separate from each other at the resonance frequency, and are configured to generate a gas pressure of a predetermined cycle in the compression space (8). The wiring structure of the driving lead wire (23) for supplying an alternating current from the driving AC power supply to the driving coil (18) will be described later.

Each of the movable members (20) is fixed to a fixed member (3).
A neutral position urging mechanism (27) for applying an urging force composed of an electromagnetic force to the movable member (20) so as to reciprocate with respect to a predetermined neutral position. Each neutral position biasing mechanism (27)
Is a pair of auxiliary coils (28, 28) each composed of an electromagnetic coil wound right and left adjacent to the drive coil (18) at a predetermined position on the outer periphery of the bobbin (17) in each linear motor (15).
Having. Each auxiliary coil (28, 28) on the left side is connected to a lead wire (24, 24) for supplying DC current, and the lead wire (2
One end of each of the pair of energizing current introduction terminals (29, 29) supported in an insulated manner on the left disk wall (1b) of the housing (1).
Connected to a DC power supply. Similarly, each auxiliary coil (28, 28) on the right side has a lead wire (24, 24) for supplying DC current.
One end of each of the lead wires (24, 24) is insulated from the pair of energizing current introduction terminals (29, 29) which are supported by being insulated from the right disk wall (1b) of the housing (1). Connected to a DC power supply. And each linear motor from DC power supply
DC current is supplied to the auxiliary coils (28, 28) on the bobbin (17) of (15), and the current between the auxiliary coils (28) and the magnetic field generated by the driving magnet (16) of the linear motor (15) is changed. Is applied to the movable member (20), and the movable member (20) is caused to reciprocate with respect to the cylinder (3) based on a predetermined neutral position by the urging force. still,
The wiring structure of the auxiliary lead wires (24, 24) for supplying the DC current from the DC power supply to each auxiliary coil (28) will also be described later.

Next, the wiring structure of the lead wires (23, 24, 24) for supplying current to the drive coil (18) and the auxiliary coils (28, 28) will be described. I do. These leads (23, 24, 24) are connected to the drive coil (1
8) Two drive leads (23) connected to each auxiliary coil
(28,28) connected to two auxiliary leads (24,2
4) consists of a total of six lead wires, but a pair of lead wires connected to the same coil is formed of a coaxial cable to form a pair. For this reason, one bobbin (17)
The lead wire taken out of the
3) and two auxiliary lead wires (24, 24) are only three in total.

As shown in FIGS. 1 and 2 (an exploded perspective view of the wiring portion of the lead wire, in particular, the wiring portion on the left side in FIG. 1), these three lead wires (2
3, 24, 24) are provided with first to third three guide plates (41, 42, 43). The first guide plate (41) is attached to the back of the bobbin (17), the second guide plate (42) is attached to the back of the first guide plate (41), and the third guide plate (43) Is attached to the inner surface of the disk wall (1b). And the first
Between the guide plate (41) and the back surface of the bobbin (17), between the first guide plate (41) and the second guide plate (42), between the third guide plate (43) and the disc wall (1b). A plurality of arc-shaped guide passages (α, β, γ) for guiding the lead wires (23, 24, 24) with the inner side surface are formed, and these guide passages (α, β, γ) are formed. Each of the lead wires (23, 24, 24) is spirally wired over the wire.

The configuration of each guide plate (41, 42, 43) and the guide passages (α, β, γ) formed by these guide plates (41, 42, 43) will be described below. 1st plate
(41) is a donut-shaped central ring portion as shown in FIGS. 3 and 4 (FIG. 4 (a) is a cross section taken along the line AA in FIG. 3, and FIG. 4 (b) is a cross section taken along the line BB in FIG. 3). (41a), and the first guide portions (41b-1, 41b
-2,41b-3) is provided. Each of these first guide portions (41
b-1, 41b-2, 41b-3) are formed in a U-shape in cross section which is open to the front side (the front side in FIG. 3) of the central ring portion (41a). The outer peripheral edge of the first guide portion (41b-1, 41b-2, 41b-3) is formed by an arc having the same shape as the outer peripheral edge of the bobbin (17), and the first plate (41) is located on the front side thereof. When mounted on the back of the bobbin (17), the back of the bobbin (17) is
Guide passages (α-1, α-2, α-3) having a rectangular cross section are formed between the guide passages (41b-1, 41b-2, 41b-3).

Each of the first guide portions (41b-1, 41b-2, 41b-
An arc-shaped flange portion (41c) having an outer peripheral edge slightly extended toward the outer peripheral side is integrally formed with one of the (3) (41b-1).

The second guide plate (42) is shown in FIGS.
(FIG. 6 (a) is a cross section taken along the line AA in FIG. 5, FIG. 6 (b) is a cross section taken along the line BB in FIG. 5, and FIG. 6 (c) is a cross section taken along the line CC in FIG. 5). As in (41), a donut-shaped central ring portion (42a) is provided.
Three guide portions (42b-1, 42b-2, 42b-) projecting to the outer circumferential side are provided at three places at equal angular intervals on the outer circumferential edge of (42a).
3) is provided. Each of these second guide portions (42b-1, 42b
-2, 42b-3), an extension (42c-1, 42c-2, 42c-3) extending from the outer peripheral edge of the central ring portion (42a) to the outer peripheral side, and the extension (42c-
1, 42c-2, 42c-3) formed at the outer peripheral end of the central ring (4
2a) lead wire guide portions (42d-1, 42d-2, 42d-3) open to the front side (front side in FIG. 5) and formed in a U-shaped cross section.
And Each second guide part (42b-1,42b-2,42b-3)
Are different from each other in the length dimension of the extension portions (42c-1, 42c-2, 42c-3). The outer peripheral shape of the second guide portion (42b-1) having the longest extension (42c-1) is the same as the outer peripheral shape of the flange portion (41c) of the first guide plate (41). I do. The extension with the second longest dimension (42c-2)
The outer peripheral shape of the second guide portion (42b-2) having the same shape as the outer peripheral shape of the first guide portion (41b-2) of the first guide plate (41). In addition, the extension with the shortest length
The outer peripheral edge shape of the second guide portion (42b-3) having the (42c-3)
The first guide plate (41) has a smaller diameter than the outer peripheral edge of the first guide portion (41b-3).

The second guide plate thus formed
(42), as shown in FIG. 1 and FIG.
In a state in which the second guide portions (42b-1, 42b-2, 4
A guide passage (β-1, β-2, β-3) having a rectangular cross section is formed between 2b-3) and the back surface of the first guide plate (41). Each second guide portion of the second guide plate (42)
Since the diameters of (42b-1, 42b-2, 42b-3) are different from each other, the diameters of these guide passages (β-1, β-2, β-3) are also different from each other.

The third guide plate (43) is shown in FIGS.
(FIG. 8 (a) is a cross section taken along line AA in FIG. 7, FIG. 8 (b) is a cross section taken along line BB in FIG. 7, and FIG. 8 (c) is a cross section taken along line CC in FIG. 7). As in (42), a donut-shaped central ring portion (43a) is provided.
The three guide portions (43b-1, 43b-2, 43b-) protruding toward the outer peripheral side are provided at three places at equal angular intervals on the outer peripheral edge of (43a).
3) is provided. Each of these third guide portions (43b-1, 43b
-2, 43b-3), an extension (43c-1, 43c-2, 43c-3) extending from the outer peripheral edge of the central ring portion (43a) to the outer peripheral side, and the extension (43c-
1, 43c-2, 43c-3) formed at the outer peripheral end of the center ring (4
A lead wire guide section (43d-1, 43d-2, 43d-3) formed in a U-shape in cross section which is open to the front side of 3a) (front side in FIG. 7).
And Each third guide part (43b-1, 43b-2, 43b-3)
Are mutually extended portions (43c-1, 43c-2, 43c-
3) The length dimensions are different. The outer peripheral edge shape of the third guide portion (43b-1) having the extension portion (43c-1) having the longest dimension is the flange portion of the first guide plate (41).
It matches the outer peripheral edge shape of (41c). In addition, the third guide portion (43b-43) having the extension portion (43c-2) having the second largest length dimension.
The outer peripheral shape of (2) is the first guide plate (41) of the first guide plate (41).
It matches the outer peripheral edge shape of the guide portion (41b-2). Furthermore,
The outer peripheral edge shape of the second guide portion (43b-3) having the extension portion (43c-3) having the shortest length dimension is the same as that of the first guide plate (4).
The diameter is smaller than the outer peripheral edge of the first guide portion (41b-3) of 1).

The third guide plate thus formed
When the (43) is overlaid on the inner surface of the disk wall (1b) as shown in FIGS. 1 and 2, each of the third guide portions (43b-1, 43b
-2, 43b-3) and a guide passageway (γ-1, γ-2, γ-3) having a rectangular cross section is formed between the inner side surface of the disk wall portion (1b). Also, each third guide portion (4) of the third guide plate (43)
3b-1, 43b-2, 43b-3) are different from each other,
The diameters of these guide passages (γ-1, γ-2, γ-3) also differ from each other.

The guide plates (41, 42, 43) have central openings (41, 42, 43a) through which a piston (7) and a coil spring (30) to be described later are inserted. Four
1d, 42e, 43e) are formed, and the central openings (41d, 42e, 43e) are formed.
e) The guide plate (41, 42, 43)
Screw holes (4) for fastening the bolts to the bobbin (17) and the disc wall (1b).
1e, 42f, 43f) are formed.

As shown in FIG. 2, each lead extends over a plurality of arc-shaped guide passages (α, β, γ) formed by the guide plates (41, 42, 43) arranged as described above. line
(23, 24, 24) are inserted so as to be spirally wired.

That is, for example, after the drive lead wire (23) connected to the drive coil (18) is taken out of the bobbin (17), the back surface of the bobbin (17) and the front surface of the first guide plate (41) And one of the guide passages (α-1, α-2, α-3) formed between the first guide plate (41) and the second guide plate (42). Guide passage formed between
The passage (β-1) having the largest diameter among (β-1, β-2, β-3) is inserted. Thereafter, the driving lead (23) is
The space between the guide plate (42) and the third guide plate (43) extends spirally, and the guide passage (γ-gamma) formed between the third guide plate (43) and the disk wall (1b). (1, γ-2, γ-3)
Of these, the path (γ-1) having the largest diameter is inserted and connected to the current introduction terminal (22).

After the auxiliary lead wire (24) connected to the one auxiliary coil (28) is taken out from the bobbin (17), the back surface of the bobbin (17) and the front surface of the first guide plate (41). One of the guide passages (α-1, α-2, α-3) formed between
(Α-3), and is formed between the first guide plate (41) and the second guide plate (42).
β-2, β-3), the passage (β-2) having the second largest diameter is inserted. Thereafter, the auxiliary lead wire (24) extends spirally in the space between the second guide plate (42) and the third guide plate (43), and the third guide plate (43) and the disk wall portion.
(1b) and the second largest path (γ-2) of the guide paths (γ-1, γ-2, γ-3) formed therethrough, and the energizing current introduction terminal (29 ).

Similarly, after the auxiliary lead wire (24) connected to the other auxiliary coil (28) is taken out from the bobbin (17), the back surface of the bobbin (17) and the first guide plate (41) The first guide plate (41) and the second guide plate (41) are inserted through one of the guide passages (α-1, α-2, α-3) formed between the first guide plate (41) and the second guide plate. Guide passage formed between (42) and
The passage (β-3) having the smallest diameter among (β-1, β-2, β-3) is inserted. Then, this auxiliary lead (24) is
The space between the guide plate (42) and the third guide plate (43) extends spirally, and the guide passage (γ-gamma) formed between the third guide plate (43) and the disk wall (1b). (1, γ-2, γ-3)
Of these, the passage (γ-3) having the smallest diameter is inserted and connected to the energizing current introduction terminal (29).

In this way, as shown in FIGS. 9 and 10, the lead wires (23, 24, 24) have different diameters and extend spirally in the same direction, and the lead wires (23, 24, 24) and the Terminals (22, 29, 2
9). With this configuration, the compressor (A) including the drive coil (18) for driving the piston and the auxiliary coil (28, 28) for setting the neutral position of the piston is connected to each of the lead wires (23, 24, 24). A current can be supplied to each coil (18, 28, 28).

-Description of Piston Support Structure- Each piston (7) is supported by a coil spring (30). Hereinafter, this support structure will be described. A support member (31) for supporting the coil spring (30) is attached to the disk wall (1b) of the housing (1). The support member (31) includes a small-diameter cylindrical shaft portion (31a) and a mounting portion (31b) formed at an axially outer end of the shaft portion (31a). ) Is the disk wall
It is fastened to the inner surface of (1b) via a third guide plate (43). A spring stopper (31c) is screwed to the tip of the shaft (31a). On the other hand, a disk-shaped spring support plate (3
1d) is attached. This spring stopper (31
c) and the spring support plate (31d)
A groove for mounting 0) is formed. The coil spring (30) is arranged around the outer periphery of the shaft portion (31a), and has one end attached to the spring stopper (31c) and the other end attached to the spring support plate (31d). That is, the coil spring (30) is provided between the support member (31) and the spring support plate (31d) integrated with the bobbin (17), and the fixed side is located at the tip end inside the piston (7). The movable side is located on the proximal side inside the piston (7). This elastically supports the piston (7).

-Description of Compression Operation- Next, the operation of this embodiment will be described. With the start of operation of the refrigerator, both linear motors (15, 1) in the compressor (A)
5) Driving lead wire from driving power supply to driving coil (18, 18)
An alternating current of a predetermined frequency is synchronously energized via (23).
With this energization, the two movable members (20, 20) including the bobbin (17) and the piston (7) come into contact with each other from their neutral positions due to the action between the magnetic fields of the drive coil (18) and the drive magnet (16). The pistons (7, 7) reciprocate in opposite directions so that the volume of the compression space (8) increases and decreases due to the contact and separation of the pistons (7, 7), and a pressure wave of a predetermined cycle is generated in the compression space (8). This compression space
Since (8) communicates with the expander through the communication pipe (10), in the expander, the displacer reciprocates at the same cycle as the pressure wave in the compression space (8), and the gas in the expansion space moves. The expansion causes cold, and the reciprocating reciprocation of the displacer cools the cold head at the tip of the cylinder to a cryogenic level.

At this time, the movable members (20, 20) are held by a neutral position urging mechanism (27) so as to be able to reciprocate with reference to the neutral position. That is, the bobbin of each linear motor (15)
A pair of auxiliary coils (28, 28) are wound around (17), and a DC current is supplied to each of the auxiliary coils (28) from a DC power supply through auxiliary lead wires (24, 24). Each auxiliary coil
(28, 28) and the drive magnet (1
Due to the interaction with the magnetic field of (6), each auxiliary coil (28, 28) receives a force from the driving magnet (16) in the direction of being pushed out of the magnetic gap. That is, when each movable member (20, 20) reciprocates from the neutral position by driving each linear motor (15), and one of the auxiliary coils (28) moves into the magnetic gap by the forward movement, the auxiliary coil Movable member due to force received by (28)
When the movable member (20, 20) moves in the backward direction and the other auxiliary coil (28) moves into the magnetic gap, the auxiliary coil (28) ) Urges the movable member (20) in the forward movement direction. In this way, the movable member (20) is urged together with the auxiliary coil (28) in the direction of being pushed out of the magnetic gap by the force received by each auxiliary coil (28), so that the movable member (20) is neutralized in a predetermined reciprocating motion. Driven into position.

Further, since the pair of movable members (20, 20) are moved in and out of synchronization with each other by the linear motors (15, 15) connected to each other, the vibration accompanying the reciprocating motion of each movable member (20) is reduced. This is offset by the reciprocating motion of the other movable member (20) that moves synchronously in the opposite direction, and the occurrence of vibration of the compressor (A) can be reduced.

The change in the wiring state of each lead wire (23, 24, 24) due to the reciprocating movement of the piston (7) and the bobbin (17) in such a driving state of the compressor (A) includes the reciprocating movement. The second guide plate (42) and the third guide plate
Since the distance between the second guide plate (43) and the third guide plate (43) changes slightly, the arrangement angle of the portion spirally extending between the second guide plate (42) and the third guide plate (43) changes only slightly. is there. Therefore, the repetitive stress acting on this portion is small, and the stress does not concentrate locally. Furthermore, since each lead wire (23, 24, 24) is arranged in a spiral with different diameters,
There is no contact between the lead wires (23, 24, 24). Therefore, when the compressor is operating, the lead wires (23, 24, 24) are disconnected, or the connection between the coils (18, 28) and the current introduction terminals (22, 29) is disconnected, so that the current is supplied. Can be prevented, and the frequency of failures during long-term use of the compressor (A) can be reduced.

In the wiring form of the present embodiment, the driving lead wire (23) is wired in the largest diameter wiring path. However, the present invention is not limited to this, and one auxiliary lead wire (23) is used. twenty four)
May be wired to the largest diameter wiring route. In this case, the driving lead wire (23) is wired to the second-largest wiring path or to the smallest-diameter wiring path.

(Modification) Each of the above-described embodiments employs a lead wire.
Although (23, 24, 24) is wired spirally in the same direction with different diameters, other wiring forms are as follows.

-Variation 1- As a variation, as shown in FIG. 11 (schematic diagram showing the wiring configuration on the back side of the bobbin), each lead wire (23, 24, 24) has a different diameter. The wiring is spirally formed in the direction. Specifically, for example, the driving lead wire (23) is wired clockwise in the drawing, while the auxiliary lead wires (24, 24) are wired counterclockwise in the drawing. Each lead wire (23,24,2
4) There is an advantage that contact between them can be avoided.

In this connection, only one auxiliary lead wire (24) may be wired in a direction opposite to that of the other lead wire.

-Modification 2-The modification 2 shown in FIG.
Are spirally wired in the same direction with the same diameter. In particular, in this example, the auxiliary lead wires (24, 24) are connected in series on the bobbin (17). For this reason, only one drive lead wire (23) and one auxiliary lead wire (24) are taken out from the bobbin (17). By minimizing the number of lead wires (23, 24) required in this way, even if the lead wires (23, 24) are wired with the same diameter, the lead wires (23, 24) The possibility of contact can be reduced.

Modification Example 3 A modification example 3 shown in FIG. 13 is composed of lead wires (23, 24, 24).
Are spirally wired in the same direction but in different directions. Also in this example, the auxiliary lead wires (24, 24) are connected in series on the bobbin (17), and the lead wire from the bobbin (17) is connected.
The number of (23,24) take-outs is kept to a minimum.

The compressor (A) according to the present embodiment has a piston (7, 7)
Although the case where the present invention is applied to a horizontal type in which the piston reciprocates in the horizontal direction has been described, the invention can also be applied to a vertical type in which the pistons (7, 7) reciprocate in the vertical direction.

Further, in the present embodiment, the case where the present invention is applied to the opposed piston type vibration type compressor has been described, but it is also possible to apply to the single piston type vibration type compressor.

Further, as the connection form between the auxiliary lead wires (24, 24), in the above-described modified examples 2 and 3, the auxiliary lead wires (24, 24) are connected in series on the bobbin (17). do it,
Although one auxiliary lead wire (24) is taken out from the bobbin (17), the auxiliary lead wires (24, 24) are connected to the bobbin (17).
A configuration in which the auxiliary lead wires (24) are taken out from the bobbin (17) by connecting them in parallel above may be adopted. Further, as in the above-described embodiment, the two coils corresponding to the respective auxiliary coils (28, 28) are used.
The configuration may be such that the auxiliary lead wires (24) are taken out of the bobbin (17) and connected in series outside the housing (1).

[0062]

As described above, the present invention has the following effects. In the invention of claim 1,
Bobbin with drive coil (18) and auxiliary coils (28, 28)
A driving lead wire (23) for supplying an alternating current to the driving coil (18) and an auxiliary for supplying a direct current to the auxiliary coils (28, 28) for the vibrating compressor having (17). By connecting to the lead wire (24), current can be individually supplied to each coil (18, 28, 28). For this reason, by using the drive coil (18) and the auxiliary coils (28, 28) together, it is possible to commercialize a compressor in which the neutral position of the piston (7) is appropriately maintained.

According to the second aspect of the present invention, each lead wire (23,
24, 24) from the bobbin (17) and take out the current introduction terminals (22, 2).
9,29). As a result, local deformation does not occur on each of the lead wires (23, 24, 24) and stress is not locally concentrated, and the lead wires (23, 24, 24) are disconnected, and the coil (18 , 28) and the current introduction terminals (22, 29) can be prevented from being disconnected from the connection portion, and current supply cannot be performed. As a result, the frequency of occurrence of failures during long-term use of the compressor can be reduced, and the reliability and the life of the compressor can be improved.

According to the third aspect of the present invention, the lead wire (23,2
Guide path (α, β, γ) for spirally wiring (4,24)
(41, 42, 43) are provided. For this reason,
The wiring state of each lead wire (23, 24, 24) can be stably obtained, and the effect according to the second aspect of the present invention can be reliably obtained.

According to the present invention, each lead wire
A wiring form when (23, 24, 24) is spirally wired can be embodied. In particular, in the inventions according to Claims 4 and 5, since the lead wires (23, 24, 24) are helically wired with different diameters, contact between the lead wires (23, 24, 24) is prevented. It is possible to avoid problems such as disconnection.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a vibration type compressor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a wiring state of lead wires between guide plates.

FIG. 3 is a plan view of a first guide plate.

4A is a sectional view taken along line AA in FIG. 3, and FIG. 4B is a sectional view taken along line BB in FIG.

FIG. 5 is a plan view of a second guide plate.

6A is a sectional view taken along line AA in FIG. 5, FIG. 6B is a sectional view taken along line BB in FIG. 5, and FIG. 6C is a sectional view taken along line CC in FIG.

FIG. 7 is a plan view of a third guide plate.

8A is a sectional view taken along line AA in FIG. 7, FIG. 8B is a sectional view taken along line BB in FIG. 7, and FIG. 8C is a sectional view taken along line CC in FIG.

FIG. 9 is a perspective view schematically showing a state in which a lead wire is taken out from a bobbin.

FIG. 10 is a plan view schematically showing a state in which a lead wire is taken out from a bobbin.

FIG. 11 is a diagram corresponding to FIG. 10 in a first modification.

FIG. 12 is a diagram corresponding to FIG. 10 in a second modification.

FIG. 13 is a diagram corresponding to FIG. 10 in a third modification.

FIG. 14 is a sectional view showing a conventional example of a vibration type compressor.

[Explanation of symbols]

 (A) Vibration compressor (1) Housing (3) Fixed member (7) Piston (8) Compression space (11) Piston fitting hole (15) Linear motor (16) Drive magnet (17) Bobbin (18) Drive coil (22) Current introduction terminal (23) Driving lead wire (24) Auxiliary lead wire (28) Auxiliary coil (29) Energizing current introduction terminal (41, 42, 43) Guide plate (guide member) (α , β, γ) Guide passage

Claims (7)

[Claims] 1. A fixing device which is fixed in a housing (1), has a piston fitting hole (11), and forms a magnetic path of a magnetic circuit generated by a driving magnet (16) of a linear motor (15). A side member (3), a piston (7) fitted into the piston fitting hole (11) to form a compression space (8) between the fixed side member (3), and the piston (7) A bobbin (17) provided with a drive coil (18) of a linear motor (15) arranged in the magnetic circuit, and supplying an alternating current to the drive coil (18). Linear motor
Drive the piston (7) to the bobbin (1
In the vibratory compressor in which the gas is periodically compressed in the compression space (8) by reciprocating with respect to the fixed member (3) together with 7), a direct current is supplied to the bobbin (17). Auxiliary coils (28, 2) that apply an electromagnetic force to the piston (7) to act on the reciprocating
The bobbin (17) has a driving lead wire (23) for supplying a current to the driving coil (18), and an auxiliary lead for supplying a current to the auxiliary coils (28, 28). A vibrating compressor characterized by being connected to wires (24, 24). 2. The vibration type compressor according to claim 1, wherein the housing (1) is provided with an AC current introduction terminal (22) and a DC current introduction terminal (29, 29). One end of the lead wire (23) is connected to the drive coil (1
8), one end of the auxiliary lead wire (24, 24) is connected to the auxiliary coil (28, 28) of the bobbin (17), respectively, and each lead wire (23, 24,
24) is removed from the bobbin (17), and then the bobbin (17)
The other end of the drive lead wire (23) extends spirally around the axis of the current supply terminal (22, 29, 29) to the AC current introduction terminal (22), and the auxiliary lead A vibrating compressor characterized in that the other ends of the wires (24, 24) are respectively connected to direct current introduction terminals (29, 29). 3. The vibration type compressor according to claim 2, wherein each lead wire (23, 24, 24) is provided on the back side of the bobbin (17) toward the current introduction terminal (22, 29, 29). Guide members (41, 42, 43) forming guide passages (α, β, γ) for guiding spirally
Vibration type compressor characterized by being provided with 4. The vibration type compressor according to claim 3, wherein the guide member (41, 42, 43) has a drive lead wire (23) and an auxiliary lead wire (24, 24) having different diameters. A vibrating compressor characterized by forming a guide passage (α, β, γ) for spirally guiding in the same direction. 5. The vibration type compressor according to claim 3, wherein the guide member (41, 42, 43) has a driving lead wire (23) and an auxiliary lead wire (24, 24) having different diameters from each other. A vibratory compressor characterized by forming a guide passage for guiding spirally in different directions. 6. The vibration type compressor according to claim 3, wherein the guide member (41, 42, 43) has a drive lead wire (23) and an auxiliary lead wire (24, 24) having the same diameter. A vibrating compressor having a guide passage for spirally guiding in the same direction. 7. The vibration type compressor according to claim 3, wherein the guide member (41, 42, 43) has a drive lead wire (23) and an auxiliary lead wire (24, 24) having the same diameter. A vibratory compressor characterized by forming a guide passage for guiding spirally in different directions.