JP2002276546A - Wiring structure to driving portion in freezer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiring structure to a driving portion in a freezer, capable of simplifying a wiring structure of a lead wire 19 to the driving portion 20 by abbreviating a part of an insulating measure in a plate spring 9, and decreasing the outer diametrical measurement of a compressor case 4 and the like, when forming a current circuit by passing the plate springs 9. SOLUTION: By paying attention to wiring the lead wire 19 so as to supply a current into an electromagnetic coil 11 through only one of the plate springs 9, this wiring structure comprises a pair of plate springs 9 disposed at intervals, fixed at outer peripheral portions, and making an inner peripheral portion thereof reciprocate, the electromagnetic coil 11 disposed between the pair of the plate springs 9, and a cylinder 8 and a piston 6 fixed on an inner peripheral portion of the plate springs 9 at one end so as to move integrally with the electromagnetic coil 11. The lead wire 19 is wired so as to supply a current into the electromagnetic coil 11 through only one of the plate springs 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring structure to a drive unit in a refrigerator, and more particularly to a wiring structure to a drive unit in a Stirling refrigerator and other refrigerators having a gas compressor for generating refrigeration. Things.

[0002]

2. Description of the Related Art In a Stirling refrigerating machine or other refrigerating machine in which a refrigerant gas such as helium gas is compressed and expanded by the interaction between a cylinder and a piston to produce refrigeration, a leaf spring is provided on a driving portion for driving the cylinder and the piston. There is a thing using. For example, there is JP-A-5-215423. An outline will be given based on FIG. FIG. 3 is a cross-sectional view of the Stirling refrigerator 1 proposed by the present applicant.
Has a gas compressor 2 and a cold head 3.
However, the gas compressor 2 has a left-right symmetric configuration,
Only a part (right half) is shown in the figure and will be described below.

The gas compressor 2 is for compressing and supplying the refrigerant to the cold head 3 and absorbing and expanding the refrigerant to generate refrigeration in the cold head 3. The compressor case 4, the intermediate header 5, The piston 6, the yoke 7, and the respective yokes 7 formed on the intermediate header 5
, A pair of circular leaf springs 9, an annular permanent magnet 10, and an annular electromagnetic coil 11.

The compressor case 4 houses therein an intermediate header 5, a piston 6, a yoke 7, a cylinder 8, a leaf spring 9, a permanent magnet 10, and an electromagnetic coil 11 symmetrically in the axial direction of the piston 6. .

[0005] The intermediate header 5 appears substantially in a cross shape in FIG. 3, has a support portion 12 in the vertical and vertical directions, forms a piston 6 in a substantially horizontal direction at the center thereof, and has the piston 6 and the support portion. A gas flow path 13 for a refrigerant such as helium gas is formed at the center of 12.

[0006] The piston 6 is located on the inner peripheral side of the compressor case 4 or the leaf spring 9 and faces the cylinder head 14 fitted in the center hole of the leaf spring 9, and a seal member 15 is provided on the outer peripheral surface thereof. At the same time, a compression / expansion chamber 16 is formed between the cylinder 8 and a cylinder head 14 integrally attached to the cylinder 8. The compression / expansion chamber 16 communicates with the gas flow path 13. The cylinder 8
It can move integrally with the bobbin member 11A of the electromagnetic coil 11.

The yoke 7 is a member made of, for example, iron for forming a magnetic path, and is located on the outer peripheral side of the compressor case 4 or the leaf spring 9. Attached.

The cylinder 8 has a piston 6 inserted therein so as to be relatively movable in the axial direction, and the cylinder 8 can reciprocate in the axial direction with respect to the fixed piston 6. The driving type of the gas compressor 2 includes a piston driving type for moving the piston 6 and a cylinder driving type.
There is a cylinder drive type that moves
It is a cylinder drive type.

The leaf spring 9 is made of a metal material having conductivity and elasticity, and its outer peripheral portion is attached to the yoke 7 by mounting bolts 17, and its inner peripheral portion is attached to the cylinder head 1 by mounting bolts 17.
4 and has a form of a plurality of inner wound slit leaf springs 9A and an outer one lead wire connecting leaf spring 9B in the laminated portion of the leaf springs 9. A wound slit leaf spring 9A and a lead wire connecting leaf spring 9B, in particular, a wound slit leaf spring 9A formed with a plurality of curved slits (not shown) extending from the outer peripheral side toward the center.
, The cylinder 8 and the electromagnetic coil 11 are supported so as to be able to reciprocate in the axial direction.

The permanent magnet 10 and the electromagnetic coil 11 constitute a linear motor, and are disposed so as to face each other. The lead is soldered to the lead wire connecting piece 18 of the lead wire connecting leaf spring 9B. An alternating current of a predetermined frequency can be supplied to the electromagnetic coil 11 via the wire 19. The drive unit 20 is constituted by the leaf spring 9, the piston 6 and the cylinder 8 together with the permanent magnet 10 and the electromagnetic coil 11, and generates the relative movement of the piston 6 and the cylinder 8. That is, by passing an alternating current of a predetermined frequency through the electromagnetic coil 11 and by the elastic repulsive force of the leaf spring 9, the permanent magnet 10 and the electromagnetic coil 11
Are relatively axially driven to generate a relative motion between the piston 6 and the cylinder 8, and the compression / expansion chamber 1 is moved.
The pressure of the refrigerant in 6 is raised and lowered, and a change in the pressure of the refrigerant is supplied from the gas flow path 13 to the cold head 3 via the gas supply pipe 21 at a predetermined timing, so that the cold head 3 generates refrigeration.

That is, the cold head 3 includes a cylinder 22 and a displacer 24 containing a cold storage material 23.
(Piston) and a spring material 25, and a reverse Stirling cycle is executed in accordance with the supply (compression and expansion) of the refrigerant whose phases are shifted from each other and the reciprocation of the displacer 24 to generate refrigeration. As the spring material 25, not only a coil spring but also the same leaf spring 9 as described above can be employed. Further, the cold head 3 may have a linear motor similar to that provided in the gas compressor 2.

FIG. 4 is an enlarged cross-sectional view of a part IV of FIG. 3 and shows a support structure of the leaf spring 9 by the mounting bolt 17. Each leaf spring 9 (wound slit leaf spring 9
A, conductive spacers 26 are alternately provided between the lead wire connecting leaf springs 9B), a first insulating sheet 27 is provided between the leaf spring 9 and the yoke 7, and a leaf spring 9 is provided.
A second insulating sheet 29 is provided between the second insulating sheet 29 and the pressing plate 28. An insulating bush 30 is interposed between the bolt body 17A of the mounting bolt 17, the leaf spring 9 and the conductive spacer 26, and a washer 31 is provided.
The holding plate 28, the second insulating sheet 29, the leaf spring 9, the conductive spacer 26 and the first
Is fixed to the end of the yoke 7.

Further, the lead wire 19 is wired as shown in FIG. 3 to form a current circuit for supplying a current to the electromagnetic coil 11 via the lead wire 19 and the leaf spring 9. First, the lead wire 19 is drawn into the compressor case 4 from the lead-in / out part 5A of the intermediate header 5, and one of the leads (first
3 is routed along the support portion 12 vertically downward in FIG. 3 to the outer peripheral portion on the opposite side, and the inside of the outer peripheral groove portion 7A of the yoke 7 is fitted to the outer side of the compressor case 4 (in FIG. It is connected to the lead wire connection piece 18 of the lead wire connection leaf spring 9B which is the leaf spring 9 located on the right side. Since the lead wire connecting leaf spring 9B to which the first lead wire 19A is connected and the wound slit leaf spring 9A are electrically connected by the conductive spacer 26 (FIG. 4), the current circuit is in this stacked state. After passing through the leaf spring 9, the lead wire connecting piece 18 of the inner lead wire connecting leaf spring 9B is reached.
The second lead wire 19B connected to the outer peripheral side of the cylinder 8 is fitted to the second lead wire 19B connected to the lead wire insertion hole 11 of the bobbin member 11A.
B, and connected to the electromagnetic coil 11 while being fixed to the bobbin member 11A by the lead wire fixing member 11C. The current circuit reaching the terminal portion on the opposite side in the diameter direction of the electromagnetic coil 11 is fixed to the bobbin member 11A with the third lead wire 19C connected to this terminal portion by the lead wire fixing member 11C. It is connected to the lead wire connecting piece 18 of the leaf spring 9 (lead wire connecting leaf spring 9B). A fourth lead wire 19D is connected to another lead wire connecting piece 18 of the same lead wire connecting leaf spring 9B and led out from the lead-in / lead-out portion 5A.

The wiring structure of the current circuit or the lead wire 19 by the lead wire 19 and the leaf spring 9 includes the arrangement structure of the annular permanent magnet 10 and the electromagnetic coil 11, the leaf spring 9, the piston 6, the cylinder 8, and the yoke. 7, that is, in particular, the drive unit 20
Lead wire 19 (second lead wire 19B and third lead wire 19C) must be integrally wired to the movable part (electromagnetic coil 11) of the compressor. Since the cylinder 8 and the piston 6 are on the inner peripheral center axis side while being on the outer peripheral side in the case 4, the lead wire 19 can be inserted through the cylinder 8 and the piston 6 located on the central axial portion. Since it is impossible, it is necessary to create a current circuit via the leaf spring 9, that is, bypassing the leaf spring 9.

However, the wiring structure of the lead wire 19 to the Stirling refrigerator 1 or its drive unit 20 (electromagnetic coil 11) has the following problems. For example, it is necessary to perform an electrical insulation treatment design on each of a pair of leaf springs 9 inside and outside (left and right in the figure). In particular, as shown in FIG. 4, a first insulating sheet 27 and a second insulating sheet 29 are provided at the fixed support portion of the leaf spring 9 by the mounting bolt 17, and the mounting bolt 17 and the yoke 7 and the leaf spring 9 are provided. There is a problem that it is necessary to design an insulating structure between the two and to prepare parts and further assemble them.

Further, in order to supply current by bypassing the leaf springs 9 at both ends opposed to each other, it is necessary to connect the leaf springs 9 at both ends with a lead wire 19 for electrical wiring.
In particular, there is a problem that the first lead wire 19A requires a wiring space including the outer peripheral groove 7A, and the outer diameter of the compressor case 4 needs to be increased.

Further, inside the compressor case 4, the outer peripheral side (particularly, the outer peripheral side of the yoke 7) is connected to a lead wire 19.
(The first lead wire 19A),
When assembling the compressor case 4 after assembling the internal components of the compressor case 4, the first lead wire 1 is connected between the compressor case 4 and the internal components (especially the yoke 7 etc.).
9A is pinched, the workability is poor, and if the compressor case 4 is assembled without noticing that it is pinched, there is a possibility that a disconnection may occur, and the assembling workability is reduced. There is a problem that may be. In addition,
These problems also occur when the driving unit 20 is applied to the cold head 3.

[0018]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and provides a wiring structure to a drive unit in a refrigerator which can simplify a wiring structure of a lead wire to the drive unit. The task is to

Another object of the present invention is to provide a wiring structure to a drive unit in a refrigerator which can omit a part of insulation treatment in a leaf spring when a current circuit is formed around a leaf spring. .

Another object of the present invention is to provide a wiring structure to a drive unit in a refrigerator in which only one of a pair of leaf springs facing each other can be used as a part of a current circuit. .

Another object of the present invention is to provide a wiring structure to a drive unit in a refrigerator capable of reducing the outer diameter of a compressor case or the like.

It is another object of the present invention to provide a wiring structure to a drive unit in a refrigerator, which can reduce the number of assembly steps.

[0023]

That is, the present invention focuses on wiring a lead wire so that current can be supplied to an electromagnetic coil through only one of the leaf springs. In a refrigerator that generates refrigeration by compressing and expanding the refrigerant, a pair of leaf springs are arranged at an interval from each other, the outer peripheral portion is fixed, and the inner peripheral portion is reciprocally movable. A permanent magnet and an electromagnetic coil disposed between the pair of leaf springs, and a cylinder and a piston, one of which is fixed to the inner peripheral portion of the leaf spring so as to be movable integrally with the electromagnetic coil. And together with the above-mentioned driving section,
A wiring structure for a drive unit in a refrigerator in which a lead wire for supplying a current to the electromagnetic coil is provided, the current being supplied to the electromagnetic coil through only one of the leaf springs. It is a wiring structure to a drive unit in a refrigerator, wherein lead wires are wired.

Each of the pair of leaf springs may be formed by laminating a plurality of conductive leaf springs, and a conductive spacer may be provided between the respective leaf springs.

The leaf springs for connecting the lead wires are formed by laminating a plurality of conductive leaf springs, and by inserting a leaf spring insulating plate into the laminated portion of the leaf springs. The leaf springs located on both sides of the leaf spring insulating plate can be insulated from each other.

The cylinder and the piston are located on the inner peripheral side of the electromagnetic coil, and a current circuit formed by the lead wire and the leaf spring extends from the outer peripheral portion of the leaf spring across the cylinder and the piston. A current can be supplied to the electromagnetic coil through the peripheral portion.

The lead wire can be connected to an inner leaf spring of the pair of leaf springs.

In the wiring structure to the drive unit in the refrigerator according to the present invention, the lead wires are wired so that current can be supplied to the electromagnetic coil via only one of the pair of plate springs facing each other. Because it is not necessary to perform insulation treatment on the other leaf spring, the size of the case such as the compressor case can be reduced, and furthermore, the wiring space for the lead wire is minimized, Alternatively, the wiring space is limited to a local area, so that assembling workability can be improved.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a wiring structure to a drive unit in a refrigerator according to an embodiment of the present invention will be described with reference to FIGS. However, the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 shows a Stirling refrigerator 40 employing the wiring structure.
FIG. 3 is a cross-sectional view of FIG.
Is similar to the Stirling refrigerating machine 1 shown in FIG. 1, but the wiring structure 41 to the drive unit 20 is different.

That is, in the wiring structure 41, the first lead wire 19A, the second lead wire 19B, the third lead wire 19C, and the fourth lead wire 19D are all connected to the inner side of the compressor case 4 (in FIG. Only the portion of the leaf spring 9 (on the left side) is connected so that current can be supplied to the electromagnetic coil 11. First, the first lead wire 19A is traversed across the compressor case 4 from the lead-in / out portion 5A, and is routed along the support portion 12 vertically downward in FIG.
Is connected to the lead wire connecting piece 18 of the leaf wire connecting leaf spring 9B on the inner side (left side in the figure) of the leaf spring 9.

The current circuit is composed of the lead wire connecting leaf spring 9.
B leads to the lead wire connecting piece 18 on the opposite side (center axis side),
The second lead wire 19B is connected to the lead wire connecting piece 18. The second lead wire 19B includes a washer 31, a holding plate 28, a second insulating sheet 29, and a wound slit leaf spring 9A.
And lead wire connecting leaf spring 9B, first insulating sheet 2
7. A lead wire fixing member is attached to the bobbin member 11A through a lead wire through hole 11B of the bobbin member 11A of the electromagnetic coil 11 through a lead wire through hole formed through a leaf spring insulating plate 42 described later. It is fixed by 11C, and is connected to the electromagnetic coil 11 through the bobbin member 11A.

The current circuit reaches a terminal on the opposite side of the electromagnetic coil 11, and a third lead wire 19C is connected to this terminal. Similarly to the conventional wiring structure shown in FIG. 3, a fourth lead wire 19D connected to the third lead wire 19C via a lead wire connecting leaf spring 9B is connected to the fourth lead wire 19D from the lead-in / out part 5A. Derive.

FIG. 2 is an enlarged cross-sectional view of a part II of FIG. 1 and shows the first lead wire 19A and the second lead wire 1 described above.
9B, the third lead 19C and the fourth lead 19
3 shows an insulating structure in a laminated portion of a leaf spring 9 connecting D. That is, as shown in FIG.
By interposing one leaf spring insulating plate 42 between the laminated portions of the (wound slit leaf spring 9A), the first leaf spring layer 9C and the second plate on both sides of the leaf spring insulating plate 42 are provided. The spring layers 9D can be insulated from each other. Therefore, even if the lead wire 19 is connected to only the inner leaf spring 9 in the compressor case 4, the first lead wire 19A and the second lead wire 19B (the first leaf spring layer 9C and the second There is no short circuit between the leaf spring layers 9D), and a necessary current circuit can be formed on the leaf spring 9 on the front and back of the laminated portion.

The Stirling refrigerator 40 having such a configuration
Further, in the wiring structure 41 to the drive unit 20, the lead wire 19 is connected only to the leaf spring 9 on the inner side (left side in FIG. 1) in the compressor case 4, so that the outer side (right side) Of the first insulating sheet 2 as shown in FIG.
It is not necessary to perform insulation treatment using the seventh and second insulation sheets 29 and the like, so that the number of parts can be reduced and the design can be simplified.

Further, since there is no need to extend the lead wire 19 in the internal space of the compressor case 4 from the inner leaf spring 9 to the outer leaf spring 9, the outer peripheral groove 7A is also formed. Without this, the size (diameter) of the portion of the compressor case 4 saw can be reduced and the size can be reduced. Further, as described above, the insulation treatment is not required, and the lead wire 19 is not required.
Since the first lead wire 19A can be prevented from being caught between the compressor case 4 and the internal components, the work can be performed without fear of disconnection, so that assembling workability is improved and the number of parts is reduced. This also contributes to cost reduction.

The current circuit formed by the lead wire 19 and the leaf spring 9 extends from the outer peripheral portion to the inner peripheral portion of the leaf spring 9 across the cylinder 8 and the piston 6 located on the inner peripheral side of the electromagnetic coil 11. Current can be supplied to the electromagnetic coil 11 and the lead wire 19 (the second lead wire 19).
B and the third lead wire 19C) are attached to the lead wire fixing member 11A by a bobbin member 11A extending from the inner peripheral portion to the outer peripheral portion.
Since it is fixed by C, even when the electromagnetic coil 11 reciprocates with the supply of the AC current, it does not come off from the wiring portion, and the current supply operation can be stably performed.

[0037]

As described above, according to the present invention, the current circuit is formed through only one of the pair of leaf springs, so that the cost can be reduced, the assembly workability and the reliability can be improved. Miniaturization is possible.

[Brief description of the drawings]

FIG. 1 is a sectional view of a Stirling refrigerator 40 employing a wiring structure 41 to a drive unit 20 according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of part II of FIG. 1;

FIG. 3 is a sectional view of a Stirling refrigerator 1 proposed by the present applicant.

FIG. 4 is an enlarged partial cross-sectional view of a portion IV in FIG. 3;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 Stirling refrigerator (FIG. 3) 2 Gas compressor 3 Cold head 4 Compressor case 5 Intermediate header 5A Introducing section of intermediate header 5 6 Piston 7 Yoke 7A Outer groove of yoke 7 (FIG. 3) 8 Cylinder 9 Leaf spring 9A Winded slit leaf spring (leaf spring) 9B Lead wire connecting leaf spring (leaf spring) 9C First leaf spring layer (FIG. 2) sandwiching leaf spring insulating plate 42 9D First leaf spring layer sandwiching leaf spring insulating plate 42 2 leaf spring layer (FIG. 2) 10 annular permanent magnet 11 electromagnetic coil 11A bobbin member of electromagnetic coil 11 11B lead wire insertion hole of bobbin member 11A 11C lead wire fixing member of bobbin member 11A 12 support portion 13 gas flow path 14 Cylinder head 15 Seal member 16 Compression / expansion chamber 17 Mounting bolt 17A Bolt body of mounting bolt 17 (FIG. 2, FIG. 18) Lead wire connecting piece 19 Lead wire 19A First lead wire (lead wire) 19B Second lead wire (lead wire) 19C Third lead wire (lead wire) 19D Fourth lead wire (lead wire) 20 Drive unit (piston 6, cylinder 8, leaf spring 9,
Permanent magnet 10, electromagnetic coil 11) 21 gas supply pipe 22 cylinder 23 cold storage material 24 displacer (piston) 25 spring material 26 conductive spacer (head 2, FIG. 4) 27 first insulating sheet 28 pressing plate 29 second Insulation sheet 30 Insulation bush 31 Washer 40 Stirling refrigerator (FIG. 1) 41 Wiring structure to drive unit 20 in refrigerator (Embodiment, FIG. 1) 42 Insulating plate for leaf spring (FIG. 2)

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yuichiro Suzuki 63-30 Yuyogaoka, Hiratsuka-shi, Kanagawa F-term in the Hiratsuka Works of Sumitomo Heavy Industries, Ltd. (reference) 3H003 AA02 AC03 CD01 CF03 3H069 AA05 BB02 CC04 DD41 DD42 DD43 DD44 EE05 EE07 EE41 3H076 AA02 BB38 BB40 BB41 CC06 CC28 CC31 CC46

Claims (5)

[Claims] 1. A refrigerating machine that generates refrigeration by compressing and expanding a refrigerant by reciprocating a drive unit. The refrigerating machine is arranged at a distance from each other, its outer peripheral part is fixed, and its inner peripheral part is fixed. A pair of leaf springs capable of reciprocating; a permanent magnet and an electromagnetic coil disposed between the pair of leaf springs; and an inner peripheral portion of the leaf spring so as to be movable integrally with the electromagnetic coil. A cylinder and a piston having one of them fixed, the drive unit is configured, and a lead wire for supplying a current to the electromagnetic coil wiring structure to the drive unit in the refrigerator, A wiring structure for a drive unit in a refrigerator, wherein the lead wires are wired so that current can be supplied to the electromagnetic coil via only one of the leaf springs. 2. The pair of leaf springs are formed by laminating a plurality of conductive leaf springs, and a conductive spacer is provided between the leaf springs. The wiring structure to a drive part in the refrigerator according to claim 1, characterized in that: 3. The leaf spring for connecting the lead wire is formed by laminating a plurality of conductive leaf springs, and inserting a leaf spring insulating plate into a laminated portion of the leaf springs. 2. The wiring structure to a drive unit in a refrigerator according to claim 1, wherein the leaf springs located on both sides of the leaf spring insulating plate can be insulated from each other. 4. A circuit in which the cylinder and the piston are located on the inner peripheral side of the electromagnetic coil, and a current circuit formed by the lead wire and the leaf spring extends over the cylinder and the piston and an outer peripheral portion of the leaf spring. 2. A wiring structure to a drive unit in a refrigerator according to claim 1, wherein a current can be supplied to the electromagnetic coil through the inner peripheral portion through the inner peripheral portion. 5. The wiring structure to a drive unit in a refrigerator according to claim 1, wherein the lead wire is connected to an inner leaf spring of the pair of leaf springs.