JP2009030461A - Moving magnet type linear compressor - Google Patents

Abstract

Provided is a movable magnet type linear compressor that can be simplified in structure, compact, and improved in efficiency by devising a mechanism system.
A movable cylinder 36 that is a bottomed cylindrical body that is movably supported by a suspension 32 and a substantially cylindrical body that is positioned in the movable cylinder 36 so as to be coaxial with the central axis of the movable cylinder 36. A movable magnet type linear compressor 1 including a fixed piston 20 is provided. This reduces the configuration in the radial direction and the axial direction of the fixed piston 20 and realizes compactness, and the clearance seal 50 is formed by the fixed piston 20 and the movable cylinder 36 that can be processed with high accuracy. To improve efficiency.
[Selection] Figure 1

Description

  The present invention relates to a movable magnet type linear compressor used in a reciprocating compressor such as a pulse tube refrigerator.

  A movable magnet type linear compressor according to the prior art will be described with reference to the drawings. FIG. 4 is a cross-sectional view of a conventional movable magnet type linear compressor. This movable magnet type linear compressor 100 is configured to include a pair of compression units on the left and right, and only the compression unit on the right side is shown in FIG. In the prior art, only the right compression unit will be described, and the description of the overlapping left compression unit will be omitted.

The movable magnet type linear compressor 100 includes a compressor case 110, a piston 120, and a linear motor 130.
The compressor case 110 further includes a case main body 111, a discharge port 112, a compression chamber 113, and a storage space 114.
The piston 120 includes a piston head 121 and a piston shaft 122.
The linear motor 130 includes a ring body 131, a suspension 132, a support shaft 133, an inner yoke holder 134, an inner yoke 135, an outer yoke 136, a coil 137, a magnet 138, and a magnet holder 139.

The linear motor 130 includes an inner yoke 135 attached to the inner yoke holder 134, an outer yoke 136 in which thin silicon steel plates are radially stacked, a coil 137 built in the outer yoke 136, and a magnet 138 attached to the magnet holder 139. And is composed of. The magnet 138 and the magnet holder 139 of the linear motor 130 are supported by a suspension 132 in which thin plates with several slits are stacked via a piston shaft 122, and the piston 120 is increased by increasing the spring constant in the radial direction. And a clearance seal 115 of several tens of μm between the inner wall of the compression chamber 113 is secured.
In such a movable magnet type linear compressor 100, the piston 120 reciprocates in the axial direction, and the piston head 121 compresses and expands the working gas in the compression chamber 113.

  Since this movable magnet type linear compressor 100 does not have a sliding part in a movable part, it is used as a linear drive reciprocating compressor of a Stirling refrigerator or a Stirling pulse tube refrigerator. In this type of compressor, in order to prevent eddy currents generated in the inner yoke 135, radial slits are formed radially in the inner yoke 135 in order to improve efficiency.

  Moreover, as a prior art which concerns on such a movable magnet type linear compressor, patent document 1 (Unexamined-Japanese-Patent No. 2001-90660, title of invention: linear compressor), patent document 2 (Unexamined-Japanese-Patent No. 2004-19489), for example. No., title of invention: linear compressor), Patent Document 3 (Japanese Patent Laid-Open No. 2004-364495, title of invention: linear motor, control method thereof, and linear compressor using the same) are known. It has been.

JP 2001-90660 A JP 2004-19489 A JP 2004-364495 A

  The prior art movable magnet type linear compressor 100 shown in FIG. 4 reciprocates a rod-shaped piston 120 so that the piston head 121 compresses and expands the working gas in the compression chamber (cylinder) 113. The prior art compressors described in Patent Documents 1, 2, and 3 basically adopt the same configuration.

Since these have a configuration in which the compression chamber (cylinder) and the linear motor are arranged in series in the piston axial direction, the conventional movable magnet type linear compressor has a problem that it is long in the axial direction of the piston shaft.
In addition, since the inner yoke, the magnet holder, and the outer yoke are arranged concentrically around the piston shaft, the movable magnet type linear compressor of the prior art has a long structure in the radial direction of the piston shaft. .
There has been a demand for a movable magnet type linear compressor having a compact structure in the axial direction and the radial direction of the piston shaft.

  Furthermore, although the movable magnet type linear compressor 100 shown in FIG. 4 has a structure in which the magnet holder 139 holding the magnet 138 and the piston 120 are moved integrally, the piston shaft 122 and the inner yoke 135 are mechanically moved. Between the inner yoke 135 and the magnet holder 138 / magnet 139, and between the magnet holder 138 and the outer yoke 136 / coil 137, and the inner wall of the compression chamber 113 and the outer wall of the piston head 121 A clearance seal 115 having a minute gap is formed between them, and the suspension 132 or the like needs to be a highly accurate mechanism so that positioning can be ensured, which causes an increase in cost and deterioration in assembly workability. It was.

  Accordingly, the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a movable magnet type linear compressor that realizes both simplification of structure, compactness, and improvement of efficiency by devising a mechanism system. It is to provide.

In order to solve the above problems, a movable magnet type linear compressor according to claim 1 of the present invention provides:
A compressor case having an accommodating space therein;
An outer yoke that is substantially cylindrical and is fixed in the accommodating space of the compressor case;
A substantially cylindrical body, and a coil held by the outer yoke;
A suspension fixed in the housing space of the compressor case;
A movable cylinder that is a bottomed cylindrical body, is coaxial with the central axis of the outer yoke, is located in the outer yoke, and is supported by the suspension so as to move in the same direction as the central axis of the outer yoke;
A magnet that is a substantially cylindrical body and is held by a movable cylinder so as to be opposed to a coil of an outer yoke;
A fixed piston, which is a substantially cylindrical body, is located in the movable cylinder so as to be coaxial with the central axis of the movable cylinder, and is provided with a discharge passage communicating with the discharge port;
An inner cylinder that is a substantially cylindrical body and is held by a fixed piston so as to be opposed to a coil of the outer yoke;
A compression chamber which is a space partitioned by a bottom surface and an inner wall surface of the movable cylinder, and a front end surface of a fixed piston disposed in a cylinder of the movable cylinder;
A clearance seal that communicates with the compression chamber and is a gap formed between the inner wall surface of the movable cylinder and the outer wall surface of the fixed piston;
With
The movable cylinder is moved in a uniaxial direction by a piston driving force supplied to the movable cylinder, and the working gas in the compression chamber is compressed and output from a discharge port.

Moreover, the movable magnet type linear compressor of the invention according to claim 2 of the present invention is
The movable magnet type linear compressor according to claim 1,
The fixed piston includes a piston body that is a cylindrical body protruding from the compressor case in a housing space of the compressor case,
It is a structure in which an inner yoke, which is a cylindrical body having substantially the same inner diameter and outer diameter as the piston body, is fixed to the tip of the piston body.

Moreover, the movable magnet type linear compressor of the invention according to claim 3 of the present invention is
The movable magnet type linear compressor according to claim 1,
The fixed piston is a cylindrical body that protrudes from the compressor case in a housing space of the compressor case, and is a piston in which a multistage hole is formed by a large-diameter hole on the tip side in the cylinder and a small-diameter hole on the case side. With a body,
It is a structure in which an inner yoke, which is a cylindrical body having substantially the same outer diameter as the large-diameter hole of the piston main body and whose inner diameter is substantially the same as the small-diameter hole of the piston main body, is fitted into the large-diameter hole and integrated. To do.

Moreover, the movable magnet type linear compressor of the invention according to claim 4 of the present invention is
In the movable magnet type linear compressor according to any one of claims 1 to 3,
The inner yoke is a cylindrical body in which a plurality of slits are radially formed in a cylindrical body of a soft magnetic material, and a nonmagnetic member having a low magnetic permeability is interposed in the slits.

Moreover, the movable magnet type linear compressor of the invention according to claim 5 of the present invention is
In the movable magnet type linear compressor according to any one of claims 1 to 3,
The inner yoke is a divided body formed by dividing a cylindrical body of a soft magnetic material into a plurality of radial shapes, and is a cylindrical body in which a nonmagnetic member having a low magnetic permeability is interposed between the two divided bodies. It is characterized by that.

Moreover, the movable magnet type linear compressor of the invention according to claim 6 of the present invention is
In the movable magnet type linear compressor according to claim 4 or 5,
The non-magnetic member is a member filled with an epoxy resin adhesive and cured.

Moreover, the movable magnet type linear compressor of the invention according to claim 7 of the present invention is
In the movable magnet type linear compressor according to any one of claims 1 to 6,
The outer yoke is made of a silicon steel laminate.

  According to the present invention as described above, it is possible to provide a movable magnet type linear compressor that realizes both simplification of structure, compactness, and improvement of efficiency by devising a mechanism system.

Next, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional configuration diagram of a movable magnet type linear compressor according to the present embodiment. FIG. 1A is a vertical cross-sectional view, and FIG. FIG. 2 is an explanatory view of the inner yoke, FIG. 2 (a) is a perspective configuration diagram of the first inner yoke, and FIG. 2 (b) is a perspective configuration diagram of the second inner yoke. The movable magnet type linear compressor 1 of this embodiment is configured to include a pair of compression units on the left and right, and only the right side is shown in FIG. In the description of this embodiment, only the right side compression unit will be described, and the description of the left side configuration will be the same, and redundant description will be omitted.
The movable magnet type linear compressor 1 includes a compressor case 10, a fixed piston 20, and a linear motor 30.

Next, details of each unit will be described.
The compressor case 10 further includes a case main body 11, a discharge port 12, a discharge flow path 13, and a storage space 14. A discharge port 12, a discharge flow path 13, and a storage space 14 are formed inside the case body 11. A discharge passage 13 communicates with the discharge port 12. After assembling the fixed piston 20 and the linear motor 30 in the accommodation space 14, a lid (not shown) is fastened by means such as a welded joint to form the accommodation space 14 that is a sealed pressure vessel. Such a compressor case 10 can have various configurations, but may be any one that can be sealed and fixed after housing the fixed piston 20 and the linear motor 30 as described above.

  The fixed piston 20 includes a piston main body 21, an inner yoke 22, and a nonmagnetic material (slit) 23. The fixed piston 20 is a structure formed by fixing an inner yoke 22, which is a cylindrical body having substantially the same inner diameter and outer diameter as the piston main body 21, to the tip of the piston main body 21. Thus, since the fixed piston 20 also functions as an inner yoke, the configuration is simplified.

The piston body 21 is a cylindrical body that is integrally formed with the case body 11 of the compressor case 10 and protrudes from the case body 11.
The inner yoke 22 is a cylindrical body that has substantially the same inner diameter and outer diameter as the piston body 21. The inner hole is the discharge flow path 13 and communicates with the discharge port 12. As shown in FIG. 2A, the inner yoke 22 is provided with a plurality of slits 23 radially in the circumferential direction with respect to a cylindrical body of soft magnetic material such as S15C subjected to magnetic heat treatment. The slits 23 are all not cut and leave an annular root 24. The slit 23 is filled with a nonmagnetic member 23 having a low magnetic permeability such as an epoxy resin to reduce eddy current.

  As a manufacturing method of the inner yoke 22 as shown in FIG. 2A, for example, after finishing the outer surface of the inner yoke 22 so as to have a previously designed outer diameter, a processing method such as wire cutting is used. A method of forming the non-magnetic member 23 by inserting the slit 23 and then filling the slit 23 with an epoxy resin, or manufacturing a cylindrical body having an outer dimension slightly larger than the outer diameter dimension designed in advance. The outer surface of the inner yoke 22 may be finished so as to have a predesigned outer diameter after forming the non-magnetic member 23 by filling and curing the epoxy resin in the slit 23.

  In the above description, as shown in FIG. 2A, the inner yoke 22 forms the slit 23 leaving the root portion 24. However, as shown in FIG. 2B, a configuration in which all the slits 23 are formed may be employed. Such an inner yoke 22 is a divided body 25 formed by radially dividing a cylindrical body of soft magnetic material, and a non-magnetic member 23 having a low magnetic permeability is interposed between the two divided bodies 25. It is good also as the made cylinder.

  The manufacturing method of the inner yoke 22 as shown in FIG. 2B is also performed by, for example, finishing the outer surface of the inner yoke 22 so as to have a predesigned outer diameter, and then slitting it by a processing method such as wire cutting. 23, and filling the epoxy resin to form and fix the non-magnetic member 23. Alternatively, the slit 23 is formed by manufacturing a cylindrical body whose outer dimension is slightly larger than the previously designed outer diameter. The outer surface of the inner yoke 22 may be finished so as to have a previously designed outer diameter after the slit 23 is filled and cured with an epoxy resin to form and fix the non-magnetic member 23.

As shown in FIGS. 1A and 1B, the linear motor 30 includes a ring body 31, a suspension 32, a support shaft portion 33, an outer yoke 34, a coil 35, a movable cylinder 36, and a magnet 37.
The ring body 31 is disposed on the left side (discharge port side) of the outer yoke 34 and on the right side (compression chamber side) of the outer yoke 34. For example, an elastic body or the like can be inserted between the ring body 31 and the outer yoke 34 to absorb the dimensional deviation. In FIG. 1A, the left ring body 31 is fixed to the compressor case 11.

The suspension 32 is fixed to the inner peripheral walls of the ring bodies 31 on both the left and right sides in the accommodation space 14 of the compressor case 10.
The support shaft 33 is fixed to the center of the suspensions 32 on both the left and right sides, and further supports the movable cylinder 36 on both the left and right sides. The movable cylinder 36 is supported by the suspensions 32 on both the left and right sides so as to be movable in the axial direction (left and right direction in FIG. 1A), although it cannot move in the radial direction.

As shown in FIG. 1B, the outer yoke 34 is formed by arranging a plurality of yokes radially in eight equal parts, and is formed in a substantially cylindrical body as a whole. The yoke is formed by laminating a large number of magnetic material plates such as a silicon steel plate having a U-shaped cross section. The outer yoke 34 is fixed in a state of being sandwiched between the left and right sides of the ring body 31 in the accommodating space 14 of the compressor case 10. A coil 35 is fitted in the groove inside the outer yoke 34.
The coil 35 is formed in an annular shape, for example, by winding a conducting wire around a bobbin (not shown) having a U-shaped cross section. The coil 35 is held by the outer yoke 34.

The movable cylinder 36 includes a cylindrical portion 361 and a bottom portion 362, and is a bottomed cylindrical body in which the bottom portion 362 is fixed to the cylindrical portion 361.
The magnet 37 is a cylindrical body and is fixed to the movable cylinder 36.

Such a movable magnet type linear compressor 1 has the following positional relationship.
A magnet 37 held by the movable cylinder 36 is located on the outer peripheral side of the inner yoke 22 held by the fixed piston 20. Further, the coil 35 of the outer yoke 34 is located on the outer peripheral side of the magnet 37 held by the movable cylinder 36. A driving force is applied to the magnet 37 according to a well-known principle, and the movable cylinder 36 is moved in accordance with the movement of the magnet 37. The linear motor 30 is configured in this way.

The compression chamber 40 is a space partitioned by the distal end surface of the fixed piston 20, the inner wall surface of the movable cylinder 36, and the in-cylinder bottom surface. The discharge flow path 13 communicates with the compression chamber 40 and communicates with the discharge port 12.
The clearance seal 50 is a space partitioned by the outer wall surface of the fixed piston 20 and the inner wall surface of the movable cylinder 36. The clearance seal 50 formed by the fixed piston 20 and the movable cylinder 36 is configured to overcome the unbalanced force of the magnet by the rigidity in the radial direction of the suspension 32 on both the left and right sides in FIG. During the compression work, the fixed piston 20 and the movable cylinder 36 function so as not to contact each other.

  Here, a coating layer having good sliding characteristics, for example, a coating layer made of Teflon (registered trademark) -polyimide resin coating, is provided on the inner wall surface of the movable cylinder 36 to thereby make contact between the fixed piston 20 and the inner surface of the movable cylinder 36 during assembly. It is good to prevent galling.

  The operation will be described. When the movable cylinder 36 reciprocates in the axial direction by the linear motor 30, the bottom surface of the movable cylinder 36 approaches the tip surface of the fixed piston 20, and the space in the compression chamber 40 becomes small. As the inner bottom surface moves away from the tip end surface of the fixed piston 20, the space in the compression chamber 40 increases, and the working gas in the compression chamber 40 repeats compression and expansion. At this time, the working gas does not leak to the clearance seal 50, the working gas moves through the discharge flow path 13, and the working gas is discharged from the discharge port 12. The operation of the movable magnet type linear compressor 1 is as described above.

According to the movable magnet type linear compressor 1 of the form shown in FIGS. 1 and 2 described above, the fixed piston 20 also serves as the inner yoke 22, and therefore includes the fixed piston 20 including the inner yoke 22 and the magnet 37. The movable cylinder 36 and the outer yoke 34 are triple concentric circles, and the quadruple concentric circles of the piston, inner yoke, magnet, and outer yoke of the conventional movable magnet type linear compressor 100 as shown in FIG. Compared to the above, the structure is simplified, and the dimension in the radial direction can be shortened.
Further, since the compression chamber 40 is formed in the movable cylinder 36, the compression chamber of the compressor case is not required in the axial direction, and the dimensions are shortened in the axial direction.
Thus, the dimensions can be shortened both in the radial direction and in the axial direction, and the overall configuration can be made compact.

  The inner yoke 22 has a non-magnetic material 23 interposed in the slit 23, and has a function of suppressing the generation of eddy currents. Thereby, since an eddy current loss can be made small with respect to an alternating magnetic field, the movable magnet type linear compressor 1 with small power consumption can be provided. In particular, since the inner yoke 22 shown in FIG. 2B has no root portion 25 where eddy currents are generated, the eddy current loss of the inner yoke 22 can be further reduced, and the movable magnet type linear compression with lower power consumption. Machine 1 can be provided.

In addition, an epoxy resin adhesive is employed as the nonmagnetic material 23 provided integrally in the slit 23. The epoxy resin adhesive is an inexpensive and generally used adhesive, and suppresses an increase in cost.
Furthermore, the outer wall surface of the inner yoke 22 determines the clearance seal 50, that is, the nonmagnetic material 23 interposed in the slit 23 also determines the clearance seal 50, but the epoxy resin adhesive is additionally processed after curing. Therefore, the outer diameter of the fixed piston 20 can be processed easily and with high accuracy.
As a result, the distance between the clearance seal 50, which is a gap formed by the outer wall surface of the inner yoke 22 of the fixed piston 20 and the inner wall surface of the movable cylinder 36, can be kept constant. As a result, the efficiency of the compressor can be improved. It is high.

  The outer yoke 34 was made of a silicon steel laminated plate. Thereby, since an eddy current loss can be made small with respect to an alternating magnetic field, a refrigerator with low power consumption can be provided.

  Next, another embodiment for carrying out the present invention will be described with reference to the drawings. FIG. 3 is a cross-sectional configuration diagram of another embodiment of a movable magnet type linear compressor. FIG. 3A is a vertical cross-sectional view, and FIG. 3B is a cross-sectional view along line BB. This movable magnet type linear compressor 2 is also provided with a pair of compression parts on the left and right, and only the right side is shown in the figure. In the description of the present embodiment, only the right-side compression unit will be described, and the description of the overlapping left side configuration will be the same, and the overlapping description will be omitted.

  The movable magnet type linear compressor 1 includes a compressor case 10, a fixed piston 60, and a linear motor 30. Here, the same configuration is adopted for both the compressor case 10 and the linear motor 30 except that the configuration of the fixed piston 60 is different from that of the previous embodiment, and the compressor case 10 and the linear motor 30 are described in duplicate. Omitted.

The fixed piston 60 includes a piston main body 61, an inner yoke 62, and a nonmagnetic member (slit) 63.
The piston body 61 is a cylindrical body that protrudes from the case body 11 of the compressor case 10, and is formed with a multistage hole by a small-diameter hole 611 on the base side and a large-diameter hole 612 on the tip side in the cylinder. .

  The inner yoke 62 is a cylindrical body whose inner diameter is substantially equal to the inner diameter of the small diameter hole 611 of the piston main body 61 and whose outer diameter is substantially equal to the inner diameter of the large diameter hole 612 of the piston main body 61. As shown in FIG. 2A, the inner yoke 62 has a plurality of slits 63 radially formed in the circumferential direction, leaving a root portion 64 with respect to a cylindrical body of soft magnetic material such as S15C subjected to magnetic heat treatment. A cylindrical body provided with a non-magnetic member 63 having a low magnetic permeability such as an epoxy resin in the slit 63 to reduce eddy current. This basic shape is the same as that of the inner yoke 22 shown in FIG. 2A, except that the outer shape is substantially equal to the inner diameter of the large-diameter hole 612 of the piston body 61 in this embodiment. The manufacturing method of the inner yoke 62 is the same as the manufacturing method of the inner yoke 62 described above, and a duplicate description is omitted.

  Further, as shown in FIG. 2 (a), the inner yoke 62 has a configuration in which the slits 63 are formed as shown in FIG. Also good. Such an inner yoke 62 is a divided body 65 formed by radially dividing a cylindrical body of a soft magnetic material, and a nonmagnetic member 63 having a low magnetic permeability is interposed between the two divided bodies 65. It is good also as the made cylinder.

  The fixed piston 60 is a structure in which the inner yoke 62 is fitted into the large-diameter hole 612 of the piston main body 61 and the inner yoke 62 is integrated. According to this configuration, the fixed piston 60 is constant without being affected by the shape of the inner yoke 22. Therefore, if the mechanical accuracy of the outer wall of the piston main body 61 is increased, the accuracy of the inner yoke 62 cannot be increased. Also, the fixed piston 20 can be assembled. As a result, the distance between the clearance seal 50, which is a gap formed by the outer wall surface of the piston main body 61 of the fixed piston 60 and the inner wall surface of the movable cylinder 36, can be kept constant, resulting in higher compressor efficiency. is doing. For this reason, the slits 63 of the inner yoke 62 can be laid out in an arbitrary number of divisions.

  The movable magnet type linear compressors 1 and 2 of the present invention have been described above. According to the movable magnet type linear compressors 1 and 2 of the present invention as described above, both the simplification of the structure, the compactness, and the improvement of the efficiency can be realized by devising the mechanism system.

BRIEF DESCRIPTION OF THE DRAWINGS It is a cross-sectional block diagram of the movable magnet type linear compressor of the best form for implementing this invention, Fig.1 (a) is a longitudinal cross-sectional view, FIG.1 (b) is an AA sectional view. 2A and 2B are explanatory diagrams of the inner yoke, in which FIG. 2A is a perspective configuration diagram of the first inner yoke, and FIG. 2B is a perspective configuration diagram of the second inner yoke. It is a section lineblock diagram of a movable magnet type linear compressor of other forms, Drawing 3 (a) is a longitudinal section, and Drawing 3 (b) is a BB line sectional view. It is sectional drawing of the movable magnet type linear compressor by a prior art.

Explanation of symbols

1, 2: Movable magnet type linear compressor 10: Compressor case 11: Case main body 12: Discharge port 13: Discharge flow path 14: Storage space 20: Fixed piston 21: Piston main body 22: Inner yoke 23: Non-magnetic member ( slit)
30: Linear motor 31: Ring body 32: Suspension 33: Support shaft part 34: Outer yoke 35: Coil 36: Movable cylinder 361: Tube part 362: Bottom part 37: Magnet 40: Compression chamber 50: Clearance seal 60: Fixed piston 61 : Piston body 611: Small diameter hole 612: Large diameter hole 62: Inner yoke 63: Nonmagnetic member (slit)

Claims (7)

A compressor case having an accommodating space therein;
An outer yoke that is substantially cylindrical and is fixed in the accommodating space of the compressor case;
A substantially cylindrical body, and a coil held by the outer yoke;
A suspension fixed in the housing space of the compressor case;
A movable cylinder that is a bottomed cylindrical body, is coaxial with the central axis of the outer yoke, is located in the outer yoke, and is supported by the suspension so as to move in the same direction as the central axis of the outer yoke;
A magnet that is a substantially cylindrical body and is held by a movable cylinder so as to be opposed to a coil of an outer yoke;
A fixed piston, which is a substantially cylindrical body, is located in the movable cylinder so as to be coaxial with the central axis of the movable cylinder, and is provided with a discharge passage communicating with the discharge port;
An inner cylinder that is a substantially cylindrical body and is held by a fixed piston so as to be opposed to a coil of the outer yoke;
A compression chamber which is a space partitioned by a bottom surface and an inner wall surface of the movable cylinder, and a front end surface of a fixed piston disposed in a cylinder of the movable cylinder;
A clearance seal that communicates with the compression chamber and is a gap formed between the inner wall surface of the movable cylinder and the outer wall surface of the fixed piston;
With
A movable magnet type linear compressor characterized in that the movable cylinder is moved in a uniaxial direction by a piston driving force supplied to the movable cylinder, compresses the working gas in the compression chamber, and outputs it from a discharge port. The movable magnet type linear compressor according to claim 1,
The fixed piston includes a piston body that is a cylindrical body protruding from the compressor case in a housing space of the compressor case,
A movable magnet type linear compressor characterized by being a structure in which an inner yoke, which is a cylindrical body having an inner diameter and an outer diameter substantially equal to those of a piston body, is fixed to the tip of the piston body. The movable magnet type linear compressor according to claim 1,
The fixed piston is a cylindrical body that protrudes from the compressor case in a housing space of the compressor case, and is a piston in which a multistage hole is formed by a large-diameter hole on the tip side in the cylinder and a small-diameter hole on the case side. With a body,
It is a structure in which an inner yoke, which is a cylindrical body having substantially the same outer diameter as the large-diameter hole of the piston main body and whose inner diameter is substantially the same as the small-diameter hole of the piston main body, is fitted into the large-diameter hole and integrated. A movable magnet type linear compressor. In the movable magnet type linear compressor according to any one of claims 1 to 3,
The inner yoke is a cylindrical body in which a plurality of slits are radially formed in a cylindrical body of a soft magnetic material, and non-magnetic members having low permeability are interposed in the slits. Machine. In the movable magnet type linear compressor according to any one of claims 1 to 3,
The inner yoke is a divided body formed by dividing a cylindrical body of a soft magnetic material into a plurality of radial shapes, and is a cylindrical body in which a nonmagnetic member having a low magnetic permeability is interposed between the two divided bodies. This is a movable magnet type linear compressor. In the movable magnet type linear compressor according to claim 4 or 5,
The non-magnetic member is a member that is filled with an epoxy resin adhesive and cured, and is a movable magnet type linear compressor. In the movable magnet type linear compressor according to any one of claims 1 to 6,
A movable magnet type linear compressor characterized in that the outer yoke is made of a silicon steel laminate.

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