JP3735771B2 - Assembling method of refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerator and a method for assembling the refrigerator, and more particularly to a Stirling refrigerator, a pulse tube refrigerator, and other refrigerators that include a gas compressor and generate refrigeration in a cold head and a method for assembling the refrigerator.
[0002]
[Prior art]
In the Stirling refrigerator, pulse tube refrigerator, and other refrigerators that generate refrigeration by compressing and expanding the refrigerant gas such as helium gas by the interaction between the cylinder and the piston, a leaf spring is used as a drive unit for driving the cylinder and the piston. There is a thing using. For example, there is JP-A-5-215423.
[0003]
In such a Stirling refrigerator, a linear motor composed of a permanent magnet, a magnetic circuit member, and an electromagnetic coil, a cylinder and a piston that are driven by the linear motor, and a leaf spring that constitutes a resonance system with the linear motor, , Etc. are assembled and housed in a predetermined pressure vessel or other case.
However, when assembling the drive unit, if each member is sequentially assembled in series, such as an intermediate header, the assembly work becomes difficult to be distributed or paralleled, and work efficiency is improved. There is a problem that can not be.
[0004]
Furthermore, in the refrigerator, maintenance of the seal structure or seal member between the cylinder and the piston is important, and it is necessary to disassemble all members, especially during maintenance to replace the piston or cylinder provided with the seal member. There is a problem that the amount of work is required as much as that at the time of assembly, and if the disassembly work at the start of maintenance is included, the amount of work naturally increases from that at the time of initial assembly.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a refrigerator and an assembling method thereof that can simplify the assembling process and reduce the assembling cost.
[0006]
It is another object of the present invention to provide a refrigerator and an assembling method thereof that can distribute or parallel work during initial assembly.
[0007]
Another object of the present invention is to provide a refrigerator and an assembling method thereof that can avoid unnecessary disassembly work during maintenance.
[0008]
[Means for Solving the Problems]
That is, according to the present invention, a movable part unit is obtained by unitizing a leaf spring, a movable part (cylinder or piston) in a drive part, and a movable part (electromagnetic coil) in a linear motor. Focusing on attaching to the linear motor, attaching the fixed part (piston or cylinder) in the drive part to the intermediate header to make a header unit, and assembling the movable part unit to the header unit. A linear motor having a permanent magnet, a magnetic circuit member and an electromagnetic coil, a cylinder and a piston for driving any one of the linear motor, and a leaf spring constituting a resonance system with the linear motor. Assembled and housed in the prescribed case A refrigerating machine that generates refrigeration by reciprocating a drive unit to compress and expand a refrigerant, and is provided with an intermediate header for assembling the case, and either the cylinder or the piston is assembled to the intermediate header. The header unit, the linear motor, and either the cylinder or the piston are assembled to the leaf spring to form a movable unit, and the cylinder and the piston can be relatively reciprocally slidably moved. As described above, the moving unit is detachably assembled to the header unit.
[0009]
The linear motor can be positioned on the outer peripheral side of the case, and the cylinder and the piston can be positioned on the inner peripheral side of the case.
[0010]
The leaf spring may be a pair of leaf springs facing each other, and the linear motor, the cylinder, and the piston may be positioned between the pair of leaf springs.
[0011]
A second invention includes a linear motor having a permanent magnet, a magnetic circuit member, and an electromagnetic coil, a cylinder and a piston that are driven by the linear motor, and a leaf spring that constitutes a resonance system with the linear motor. A refrigerating machine that generates refrigeration by reciprocating the drive unit and compressing and expanding the refrigerant, the assembly comprising: An intermediate header to be assembled is provided, and either the other of the cylinder and the piston is assembled to the intermediate header to form a header unit, and the linear motor and one of the cylinder and the piston are assembled to the leaf spring. In addition to the movable unit, the cylinder and the piston So as to be reciprocally slidable movement, the movable section unit is a method of assembling a refrigerator, which comprises as assembled detachably on the header unit.
[0012]
A jig having a disc portion that can be attached to an end portion of the linear motor and a rod portion that can be engaged with either the cylinder or the piston is prepared, and the cylinder and the piston are provided on the rod portion. The movable part unit can be assembled in a state where any one of them is engaged.
[0013]
In the refrigerator and its assembling method according to the present invention, for example, a piston is assembled to an intermediate header to form a header unit, and a linear motor and, for example, a cylinder to a leaf spring are assembled to a movable unit. Since the movable unit is detachably assembled to the header unit so as to be reciprocally slidable, the drive unit of the refrigerator is divided into the header unit and the movable unit so that they can be assembled independently. The assembly work can be distributed and parallelized, and the assembly work can be simplified and the cost can be reduced.
[0014]
In addition, when replacing the seal part between the cylinder and piston, which is frequently used in maintenance of the refrigerator, it is not necessary to disassemble all the parts, and only the necessary parts (movable part unit and header unit) can be disassembled. It is good, and it is easy to replace the cylinder or piston and handle the sealing member, and at the time of assembly, there is no need to position the fixed part (header unit) and the movable part (movable part unit). Maintenance workability is also good.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, a refrigerator and its assembling method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4 by taking a Stirling refrigerator as an example.
FIG. 1 is a cross-sectional view of a Stirling refrigerator 1, and the Stirling refrigerator 1 includes a gas compressor 2 and a cold head 3.
[0016]
The gas compressor 2 is for generating a refrigeration in the cold head 3 by compressing and supplying refrigerant to the cold head 3 and absorbing and expanding it. 1 includes a central header unit 5 as a fixed portion appearing in a cross-shaped shape, and a pair of left and right movable unit 6 as a movable portion assembled to the header unit 5.
[0017]
2 is a cross-sectional view of the header unit 5, and FIG. 3 is a cross-sectional view of the movable unit 6 located on the right side of FIG.
The header unit 5 includes an intermediate header 7 that appears in the vertical direction in FIG. 2, and a pair of left and right pistons 8 that are attached to the intermediate header 7 in the horizontal direction.
The pair of left and right movable unit 6 includes a magnetic circuit member 11 composed of a yoke 9 and a magnetic member 10, a pair of left and right circular leaf springs 12, a magnetic circuit member 11, an annular permanent magnet 13 and A linear motor 15 including an annular electromagnetic coil 14, a bobbin member 16 of the electromagnetic coil 14, a cylinder 17 attached to the bobbin member 16, and a cylinder head 18 are included.
[0018]
The compressor case 4 accommodates therein a header unit 5 and a movable unit 6 symmetrically in the axial direction of the piston 8.
[0019]
As shown in FIG. 2, the header unit 5 appears in an almost cross shape. The intermediate header 7 has a support portion 19 in the vertical and vertical directions, and a pair of left and right pistons 8 are attached by mounting bolts 20 in the horizontal direction of the center. At the same time, a gas flow path 21 of a refrigerant such as helium gas is formed in the central part of the piston 8 and the support part 19.
[0020]
The piston 8 faces the cylinder head 18, and a seal member 22 is provided on the outer peripheral surface thereof, and a compression / expansion chamber 23 is formed between the cylinder 17 and the cylinder head 18 integrally attached to the cylinder 17. To do. The compression / expansion chamber 23 communicates with the gas flow path 21. The cylinder 17 can move together with the electromagnetic coil 14 together with the bobbin member 16.
[0021]
The yoke 9 and the magnetic member 10 are, for example, iron members for forming a magnetic path in the linear motor 15. The yoke 9 has the outer peripheral portion of the leaf spring 12 and the permanent magnet 13 attached thereto, and the magnetic member 10. The electromagnetic coil 14 is located between the permanent magnet 13 and the permanent magnet 13.
[0022]
The cylinder 17 has the piston 8 inserted therein so as to be relatively movable in the axial direction (reciprocating sliding motion is possible), and the cylinder 17 can be reciprocated in the axial direction with respect to the piston 8 in a fixed state.
The drive type of the gas compressor 2 includes a piston drive type that moves the piston 8 and a cylinder drive type that moves the cylinder 17, but the illustrated example is a cylinder drive type.
[0023]
The leaf spring 12 is composed of a metal material having conductivity and elasticity, and its outer peripheral portion is attached to the yoke 9 by a mounting bolt 24 and its inner peripheral portion is attached to the cylinder head 18 by the mounting bolt 24. And in the laminated part of a leaf | plate spring, it has the form of the inner side several sheet | seat slit leaf | plate spring 12A and the sheet | seat spring 12B for one lead wire connection outside.
The elastic force of the winding slit leaf spring 12A and the lead wire connecting leaf spring 12B, particularly the winding slit leaf spring 12A in which a plurality of curved slits (not shown) from the outer peripheral side toward the center are formed. Thus, the cylinder 17 and the electromagnetic coil 14 are supported so as to reciprocate in the axial direction.
[0024]
The linear motor 15 comprises a magnetic circuit member 11, a permanent magnet 13 and an electromagnetic coil 14, and the permanent magnet 13 and the electromagnetic coil 14 are arranged so as to face each other, and a lead wire connecting leaf spring 12B. An alternating current having a predetermined frequency can be supplied to the electromagnetic coil 14 through a lead wire 26 soldered to the lead wire connecting piece 25.
Together with the linear motor 15, the plate spring 12, the piston 8, and the cylinder 17 constitute a drive unit 27 to generate relative movement of the piston 8 and the cylinder 17.
That is, the permanent magnet 13 and the electromagnetic coil 14 are relatively axially moved by passing an alternating current of a predetermined frequency through the electromagnetic coil 14 and by the elastic repulsion force of the leaf spring 12 that forms a resonance system with the linear motor 15. To cause the piston 8 and the cylinder 17 to move relative to each other, to increase or decrease the pressure of the refrigerant in the compression / expansion chamber 23, and from the gas flow path 21 to the cold head 3 via the gas supply pipe 28. The change is supplied at a predetermined timing to cause the cold head 3 to freeze.
[0025]
That is, the cold head 3 has a cylinder 29, a displacer 31 (piston) containing the regenerator material 30, and a spring material 32, and the refrigerant supply (compression expansion) and the displacer shifted in phase. A reverse Stirling cycle is executed with the reciprocating motion of 31 to generate refrigeration.
As the spring material 32, a plate spring 12 similar to the above can be adopted as well as a coil spring.
Further, the cold head 3 may have a linear motor 15 similar to that provided in the gas compressor 2.
[0026]
FIG. 4 is a cross-sectional view showing the jig 33 for assembling the movable part unit 6 and the movable part unit 6 as described above. The jig 33 is equivalent to the diameter of the movable part unit 6, particularly the yoke 9. It has the disc part 34 which has a diameter, and the rod part 35 (rod part) for pistons welded perpendicularly to the center axis part of the disc part 34.
The disc part 34 can fix the circumference part of the yoke 9 in the movable part unit 6 (magnetic circuit member 11) with a jig bolt 36.
The piston rod portion 35 is inserted into the cylinder 17 instead of the piston 8 in the header unit 5 (FIG. 2), and positions the cylinder 17.
[0027]
In order to assemble the movable unit 6, as shown in FIG. 4, first, the magnetic member 10, the permanent magnet 13, and the outer peripheral side of the leaf spring 12 on the left side in FIG. At the same time, the yoke 9 is temporarily fixed to the disk portion 34 using the jig bolt 36 in a state where the bobbin member 16 to which the electromagnetic coil 14 is attached is assembled to the inner peripheral side of the leaf spring 12.
[0028]
Next, the cylinder 17 is inserted into the piston rod portion 35, positioned, and fixed to the inner peripheral side of the leaf spring 12 via the bobbin member 16, and further, the cylinder head 18 and the leaf spring on the right side in FIG. 12, the inner peripheral side of the plate spring 12 is fixed using a mounting bolt 24, and the outer peripheral side of the leaf spring 12 is fixed to the yoke 9 using another mounting bolt 24.
Finally, if the jig bolt 36 is removed and the jig 33 is removed, the movable unit 6 as shown in FIG. 3 can be manufactured.
[0029]
In the Stirling refrigerator 1 having such a configuration, the header unit 5 is assembled as shown in FIG. 2, while the movable unit 6 is separately assembled as shown in FIG. 4, and the pistons on both sides of the header unit 5 are assembled. The header unit 5 and the movable unit 6 are combined together so that the cylinder 17 of the movable unit 6 is inserted into the unit 8, and the fixing bolt 37 (FIG. 1) is tightened instead of the jig bolt 36.
Thus, the magnetic circuit portion can be unitized as the movable unit 6 and the header unit 5 and the movable unit 6 can be assembled simultaneously and independently, and the assembly workability of the gas compressor 2 in the refrigerator 1 can be improved. it can.
[0030]
Further, when replacing the piston 8 or the like during maintenance, the piston 8 can be exposed to the outside simply by disassembling the header unit 5 and the movable unit 6, and the piston 8 can be exposed from the support portion 19 of the header unit 5. 8 can be separated and exchanged, so that the movable unit 6 itself can be separated from the header unit 5 and does not need to be disassembled, and only minimal disassembly and reassembly are required.
[0031]
【The invention's effect】
As described above, according to the present invention, for example, in gas compressors, the assembly parts of the Stirling refrigerator and other refrigerators are simplified by unitizing the component parts such as a header unit and a movable unit. It can also contribute to cost reduction.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a Stirling refrigerator 1 according to an embodiment of the present invention.
2 is a cross-sectional view of the header unit 5. FIG.
3 is a cross-sectional view of the movable unit 6 located on the right side of FIG.
4 is a sectional view showing a jig 33 for assembling the movable unit 6 and the movable unit 6; FIG.
[Explanation of symbols]
1 Stirling refrigerator (refrigerator, Fig. 1)
2 Gas compressor 3 Cold head 4 Compressor case (pressure vessel, case)
5 Header unit (Fig. 2)
6 Movable unit (Fig. 3)
7 Intermediate header 8 Piston 9 Yoke 10 Magnetic member 11 Magnetic circuit member (Yoke 9, Magnetic member 10)
12 leaf spring 12A winding slit leaf spring (leaf spring)
12B Lead wire connection leaf spring (leaf spring)
13 annular permanent magnet 14 electromagnetic coil 15 linear motor (magnetic circuit member 11, permanent magnet 13, electromagnetic coil 14)
16 Bobbin member 17 Cylinder 18 Cylinder head 19 Support part (FIG. 2)
20 Mounting bolt 21 Refrigerant gas flow path 22 Seal member 23 Compression / expansion chamber 24 Mounting bolt 25 Lead wire connecting piece 26 Lead wire 27 Drive unit (piston 8, leaf spring 12, linear motor 15, cylinder 17)
28 Gas supply pipe 29 Cylinder 30 Cold storage material 31 Displacer (piston)
32 Spring material 33 Jig for assembling movable unit 6 (FIG. 4)
34 Disc part 35 of jig 33 Piston rod part (rod part) of jig 33
36 Jig bolt (Fig. 4)
37 Fixing bolt (Fig. 1)

Claims (1)

A linear motor having a permanent magnet, a magnetic circuit member and an electromagnetic coil;
With this linear motor, a cylinder and a piston that drive either one of them,
Assemble a drive unit having this linear motor and a leaf spring that constitutes a resonance system, and house it in a predetermined case.
A refrigerating machine assembly method for generating refrigeration by reciprocating the drive unit to compress and expand the refrigerant,
An intermediate header for assembling the case is provided,
Assembling either the cylinder or the piston to the intermediate header to form a header unit,
The linear motor;
Either one of the cylinder and the piston is assembled to the leaf spring to form a movable unit,
A disc portion attachable to an end of the linear motor;
Preparing a jig having a rod portion engageable with any one of the cylinder and the piston;
Assembling the movable unit in a state where either the cylinder or the piston is engaged with the rod part,
A method of assembling a refrigerator, wherein the movable unit is detachably assembled to the header unit so that the cylinder and the piston can relatively reciprocate.

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