JP2001359268A - Vibration-type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the performance of a vibration-type compressor, using a linear motor (20) while its dimensions are maintained or to reduce its dimensions, while maintaining performance level. SOLUTION: Contact planes(CP) between yokes (21) and permanent magnets (23) are tapered planes which are inclined with respect to the axis of a linear motor (20).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration type compressor for compressing a gas by reciprocating a piston, and more particularly to a magnetic circuit configuration in which a linear motor is used as a piston driving mechanism.

[0002]

2. Description of the Related Art Conventionally, a vibration type compressor has been used, for example, in a Stirling refrigerator which is a kind of a small refrigerator which generates cryogenic temperature. Generally, a Stirling refrigerator is configured by combining a vibrating compressor and an expander, and the expander expands compressed gas discharged from the vibrating compressor by reciprocating motion of a displacer to reach a cryogenic level. Is configured to generate cold.

The vibration type compressor is provided with, for example, a linear motor as a driving mechanism for reciprocatingly driving the piston (Japanese Utility Model Application Laid-Open No. 5-69564 (registered utility model No. 2518671).
No.) Publication. FIG. 4 shows an example of this type of vibratory compressor. The illustrated vibration type compressor has a configuration in which a pair of pistons are arranged to face each other in a cylinder.

The vibrating compressor (1) comprises a cylinder (11) having flanges (17c) formed at both ends of a cylindrical body, and a cylinder fixed to the flanges (17c) at both ends of the cylinder (11). -Shaped casing (12), a pair of pistons (13) reciprocally loaded in a cylinder (11), a piston rod (14) fixed to each piston (13), and a piston rod (14). And a flexure spring (15) attached to each casing (12) so as to elastically support the piston (13) in a reciprocating manner.The linear motor (20) includes a casing (12) as a drive source for each piston (13). ) Is connected to the piston rod (14).
The compression space between the cylinder (11) and the piston (13)
A compression space (S) is formed, and the compression space (S) is connected to an expander (not shown) via a communication pipe (2), and compressed gas is supplied to the expander.

As shown in detail in FIG. 5, each linear motor (20) includes a yoke (21) fixed to a casing (12) and a bobbin (22) fixed to a piston rod (14). ing. The yoke (21) has an inner cylinder (21a) and an outer cylinder (21b).
A ring-shaped permanent magnet (23) is fixed to the outer peripheral surface of (21a). The bobbin (22) has an electromagnetic coil (24) at one end, and an electromagnetic coil (24) is provided in a magnetic gap (G) between the permanent magnet (23) and the outer cylinder (21b) of the yoke (21). Is configured to be located. In FIG. 5, the arrows schematically show the flow of the lines of magnetic force.

In the above configuration, when an alternating current having a predetermined frequency is supplied to the electromagnetic coil (24) of the linear motor (20),
The electromagnetic force acting between the current flowing through the electromagnetic coil (24) and the magnetic field generated in the magnetic gap (G) causes the bobbin (22)
The piston rod (14) is driven via
3) reciprocate in the cylinder (11) so as to approach and move away from each other. As a result, a predetermined period of gas pressure is generated in the compression space (S).

Although not shown, the expander has a cylindrical cylinder in which a free displacer is fitted so as to be able to reciprocate. Is divided into The free displacer is filled with a regenerator (regenerative heat exchanger), which communicates with the expansion space and the working space. The working space is connected to the compression space (S) of the compressor (1) via the connecting pipe (2). Then, when the free displacer reciprocates due to the gas pressure from the compressor (1), the gas expands in the expansion space, and cold occurs at the cold head at the tip of the cylinder.

[0008]

In the vibration type compressor (1), it is difficult not only to improve the performance but also to reduce the size of the compressor. It is also difficult to keep the size (the current size) and to reduce the size while maintaining the performance.

For example, if the volume of the magnet (24) is increased, the magnetic flux density in the magnetic gap (G) can be increased.
The piston (13) can be efficiently driven with a small current, thereby improving the performance.
If 3) is increased, the linear motor (20) becomes large or heavy, which may cause the device (1) to become large and heavy. For this reason, it is extremely difficult to prevent the device (1) from increasing in size while improving the performance. On the contrary, when the size of the device (1) is reduced, the performance tends to be sacrificed because the magnetic flux density decreases.
It is also very difficult to reduce the size while maintaining performance.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vibrating compressor using a linear motor that prevents at least the performance from being increased while increasing the performance. In other words, the size of the apparatus can be reduced while maintaining the performance. More preferably, the apparatus can be reduced in size while improving the performance.

[0011]

According to the present invention, a piston (13) is provided.
A linear motor (20) that reciprocates the inner cylinder (21a) and the outer cylinder (21b) with a flange (21c).
(21) and the inner cylinder of the yoke (21) (2
1a) and one of the outer cylinders (21b) (21a)
b) Permanent magnet (23) forming a magnetic gap (G) with
And a bobbin (22) connected to a piston (13) with an electromagnetic coil (24) located in a magnetic gap (G), a yoke (21) and a permanent magnet (23 ) Or the shape of the yoke (21) is specified below.

Specifically, a first solution taken by the present invention is that the joint surface (CP) between the yoke (21) and the permanent magnet (23) is inclined with respect to the axis of the linear motor (20). It is formed on an inclined surface. The magnet (23) is attached to the inner cylinder (21a) of the yoke (21).
When fixing the joint, the joint surface (CP) may be an inclined surface whose diameter decreases as the distance from the flange (21c) increases.
When fixing the magnet (23) to the outer cylinder (21b) of (1), the joint surface (CP)
May be an inclined surface having a larger diameter as the distance from the flange (21c) increases. In the above configuration, the yoke (2
The joining surface (CP) between 1) and the permanent magnet (23) is preferably formed as a tapered surface.

[0013] The second solution taken by the present invention is:
Instead of the specifics of the first solving means, the inner cylinder (21a) of the yoke (21) is formed so that the cross-sectional area of the magnetic flux passage is substantially constant.
It defines the cross-sectional shapes of the outer cylinder (21b) and the flange (21c). In this configuration, the yoke (21) is formed such that the inner cylinder (21a) is formed to be thicker than the outer cylinder (21b) and the flange (2
1c) is preferably formed such that the thickness decreases from the inner cylinder (21a) side to the outer cylinder (21b) side.

[0014] The third solution taken by the present invention is:
The above-mentioned first and second means are combined with each other. Specifically, the joint surface (CP) between the yoke (21) and the permanent magnet (23) is fixed to the linear motor (20) The inner cylinder (21a) and the outer cylinder of the yoke (21) are formed on an inclined surface inclined with respect to the axis of the
(21b) and the cross-sectional shape of the flange (21c). Also in this case, the joint surface between the yoke (21) and the permanent magnet (23)
(CP) is preferably formed on a tapered surface. In the yoke (21), the inner cylinder (21a) is formed thicker than the outer cylinder (21b), and the thickness of the flange (21c) is increased from the inner cylinder (21a) side to the outer cylinder (21b) side. Is preferably formed to be thin.

[0015] Further, in the configuration of each of the above-mentioned solving means,
The yoke (21) is preferably chamfered (CH) on at least one of the corners of the inner peripheral edge of the inner cylinder (21a) and the outer peripheral edge of the outer cylinder (21b).

-Operation- In the first and third solutions, the inner cylinder (21) of the yoke (21)
Since the joint surface (CP) between the a) and the permanent magnet (23) is formed on an inclined surface such as a tapered surface, the volume of the magnet (23) can be increased without increasing the size of the linear motor, Then, the magnetic flux density of the magnetic gap (G) increases. Also a magnet
The magnetic flux incident on the outer cylinder (21b) from the (23) via the electromagnetic coil (24) is bent while following the shape of the yoke (21).
b), the flange (21c), the inner cylinder (21a) in order, and when entering the magnet (23) again, the inner cylinder (21a) or the outer cylinder (21b)
Goes straight along and enters the magnet.

Next, in the second and third solving means, the sectional shape of the yoke (21) is specified so that the sectional area of the magnetic flux passage is substantially constant, so that the magnetic force lines are outside. Tube (21
b) When flowing through the flange (21c) and the inner cylinder (21a), it is possible to almost eliminate useless portions (portions with small magnetic flux distribution) on the magnetic circuit. This is the same when a chamfer (CH) is provided at a predetermined corner of the yoke (21).

[0018]

According to the first and third means, the joint surface (CP) between the inner cylinder (21a) of the yoke (21) and the permanent magnet (23) is formed as an inclined surface, so Since the magnetic flux density of the magnetic gap (G) can be increased while increasing the volume of (23) and preventing the mechanism from increasing in size, the piston requires less current.
(13) can be driven efficiently. The yoke (2
By forming the joint surface (CP) between the inner cylinder (21a) and the permanent magnet (23) of (1) on an inclined surface, magnetic flux is generated by the inner cylinder (21a) or the outer cylinder (21b).
Since the light enters the magnet straight from above, the lines of magnetic force flowing through the yoke (21) surely return to the magnet (23), and the waste of the magnetic circuit can be reduced.

From the above, it is possible not only to improve the performance while preventing an increase in size, but also to reduce the size while maintaining the performance, and to improve the performance within a certain range. It is also possible to reduce the size while increasing the height.

Further, according to the second and third means, the yoke (21) can be formed in a shape without waste according to the magnetic flux distribution, whereby the size of the mechanism can be reduced. Becomes Moreover, it is possible to prevent the performance from deteriorating while the mechanism is downsized. Also,
Conversely, it is possible to improve the performance while preventing an increase in size, and it is possible to reduce the size while improving the performance within a certain range.

The inner cylinder (21a) has an inner peripheral edge,
Since the magnetic flux density is extremely low at the corner of the outer peripheral edge of (21b),
If the corners are chamfered (CH), the weight of the yoke (21) can be reduced without substantially affecting the flow of the lines of magnetic force (that is, without deteriorating the performance).

[0022]

Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a vibration type compressor according to the first embodiment.
FIG. 3 is an enlarged sectional view of a main part showing a schematic structure of a linear motor (20) of (1). The overall configuration of the vibrating compressor (1) is the same as that described with reference to FIG.
(13) are arranged to face each other, and a pair of linear motors (20) are provided to drive these pistons (13). The description of the overall structure of the vibration compressor (1) is omitted here to avoid duplication.

The linear motor (20) of the vibration type compressor (1)
Is composed of a combination of a yoke (21) fixed to a casing (12) and a bobbin (22) connected to a piston (13) (see FIG. 4) via a piston rod (14). In the yoke (21), the inner cylinder (21a) and the outer cylinder (21b) are flanged.
(21c). And the inner cylinder (21
a) A ring-shaped permanent magnet (23) is fixed to the outer peripheral surface of
A magnetic gap (G) is defined between the permanent magnet (23) and the outer cylinder (21b) of the yoke (21). An electromagnetic coil (24) is fixed to the bobbin (22), so that the electromagnetic coil (24) is located within the magnetic gap (G).

As a feature of the first embodiment, the joint surface (CP) between the inner cylinder (21a) of the yoke (21) and the permanent magnet (23) is formed by a flange.
(21c) is formed on an inclined surface having a smaller diameter as the distance from the (21c) increases. Specifically, the joint surface (CP) is a linear motor (2
It is formed on a tapered surface (conical surface) inclined with respect to the axis of 0). In addition, the yoke (21) is chamfered (CH) on the flange-side end of the inner periphery of the inner cylinder (21a) and the flange-side end of the outer periphery of the outer cylinder (21b).

-Operating operation- In the above configuration, the compressor starts operating with the compressor.
The electromagnetic coil (24) of each linear motor (20) in (1)
An alternating current having a predetermined frequency is synchronously supplied from a drive power supply (not shown). When an alternating current of a predetermined frequency is supplied to the electromagnetic coil (24) of the linear motor (20) in this manner, an electromagnetic force acting between the current flowing through the electromagnetic coil (24) and the magnetic field generated in the magnetic gap (G) is generated. The force drives the piston rod (14) through the bobbin (22), and the pistons (13) reciprocate in opposite directions so as to approach and separate from each other in the cylinder (11). This allows the compression space
The volume of (S) increases or decreases, and a pressure wave of a predetermined cycle is generated in the compression space (S).

As described with reference to FIG. 4, since the compression space (S) communicates with the expander (not shown) through the communication pipe (2), the compression space (S) is discharged from the vibration type compressor (1). Compressed gas is supplied to the expander. And in the expander, the compressor
Due to the gas pressure from (1), the free displacer reciprocates in the same cycle as the above pressure wave, at which time the gas expands in the expansion space, and the cold head at the cylinder end of the expander is cooled to a cryogenic level. You.

In the first embodiment, the joining surface (CP) between the inner cylinder (21a) of the yoke (21) and the permanent magnet (23) is formed as a tapered surface. Therefore, if the dimensions of the inner and outer diameters of the yoke (21) are the same as in the examples of FIGS. 4 and 5, the volume of the magnet (23) increases, and the magnetic flux density of the magnetic gap (G) increases. Also,
The magnetic flux incident on the outer cylinder (21b) from the magnet (23) via the electromagnetic coil (24) is bent while following the shape of the yoke (21).
(21b), the flange (21c), and the inner cylinder (21a) in that order, and then enter the magnet (23) again. At this time, the magnetic flux flowing along the inner cylinder (21a) proceeds straight and enters the magnet as shown by the arrow in FIG.

According to the first embodiment, the joining surface (CP) between the inner cylinder (21a) of the yoke (21) and the permanent magnet (23) is formed as a tapered surface.
Compared with the example of FIG. 5, the magnetic flux density of the magnetic gap (G) is increased while increasing the volume of the magnet (23) and preventing the mechanism from being enlarged. For this reason, while preventing enlargement,
The piston (13) can be efficiently driven with a small current.

The magnetic flux incident on the outer cylinder (21b) from the magnet (23) via the electromagnetic coil (24) is bent along the shape of the yoke (21) while being bent along the outer cylinder (21b), the flange (21c), Inner cylinder (21
a) Pass through in order. Here, as shown in the example of FIG. 5, the flow of the magnetic flux, the corner of the inner peripheral edge of the inner cylinder (21a) on the flange side and the corner of the outer peripheral edge of the outer cylinder (21b) on the flange side. In the portions indicated by phantom lines, magnetic lines of force hardly flow, and the magnetic flux density is extremely low. Since the corners are chamfered (CH) in the first embodiment, the weight of the yoke (21) can be reduced without substantially affecting the flow of the magnetic flux.

The inner cylinder (21a) of the yoke (21) and the permanent magnet
Since the joint surface (CP) with (23) is formed into a tapered surface, the magnetic flux enters the magnet straight from the inner cylinder (21a).
Leakage of magnetic flux returning to (23) does not occur, and waste of the magnetic circuit can be reduced.

As described above, according to the first embodiment, it is possible to increase the performance while preventing an increase in size, and conversely, it is possible to reduce the size of the device (1) without lowering the performance. However, within a certain range, the performance can be improved while reducing the size of the device (1).

[0033]

Embodiment 2 In Embodiment 2 of the present invention, as shown in FIG. 2, the shapes of the yoke (21) and the permanent magnet (23) are different from those in Embodiment 1.

In the second embodiment, the inner cylinder (21a) and the outer cylinder (21) of the yoke (21) are adjusted so that the cross-sectional area of the magnetic flux passage is substantially constant.
b) and the sectional shape of the flange (21c) is determined. Specifically, the yoke (21) is
The inner cylinder (21a) is formed to be thicker than the outer cylinder (21b) according to the ratio of the diameter of the outer cylinder (21b) to the outer cylinder (21b), and the thickness of the flange (21c) is increased from the inner cylinder (21a) side. It is formed so as to become thinner toward the outer cylinder (21b) side.

The inner cylinder (21a) of the yoke (21) and the permanent magnet
The joint surface (CP) with (23) is not a tapered surface but a straight cylindrical surface. Furthermore, the yoke (21) is
Chamfering (CH) is performed on the flange-side end of the inner peripheral edge of 1a) and both side ends of the outer peripheral edge of the outer cylinder (21b). In addition, chamfer
(CH) may be provided on both side ends of the inner peripheral edge of the inner cylinder (21a).

-Driving operation-In the above configuration, the electromagnetic coil of the linear motor (20)
By supplying an alternating current having a predetermined frequency to (24), the compressor (1) is driven by the same operation as in the first embodiment, and the compressed gas is supplied to the expander. Occurs.

In the second embodiment, the cross-sectional shape of the yoke (21) is specified so that the cross-sectional area of the magnetic flux path becomes substantially constant, and the predetermined corner of the yoke (21) is chamfered ( C
H) is provided. Therefore, when the magnetic flux flows through the outer cylinder (21b), the flange (21c), and the inner cylinder (21a), it is possible to almost eliminate unnecessary parts on the magnetic circuit.

-Effects of the Second Embodiment- According to the second embodiment, the yoke (21) can be formed in a lean shape in accordance with the magnetic flux distribution, thereby reducing the size of the mechanism. Becomes possible. Further, it is possible to prevent the performance from deteriorating while the mechanism is downsized. It is also possible to improve the performance while maintaining the current size,
Within a certain range, it is possible to reduce the size while improving the performance.

[0039]

Third Embodiment A third embodiment of the present invention has a structure in which the features of the first embodiment and the second embodiment are combined, as indicated by a virtual line in FIG.

More specifically, the joint surface (CP) between the inner cylinder (21a) of the yoke (21) and the permanent magnet (23) is formed as a tapered surface having a smaller diameter as the distance from the flange (21c) increases. ,
In the yoke (21), the cross-sectional shapes of the inner cylinder (21a), the outer cylinder (21b), and the flange (21c) are determined so that the cross-sectional area of the magnetic flux passage is substantially constant.

In the yoke (21), the inner cylinder (21a) is formed to be thicker than the outer cylinder (21b), and the joint surface (CP) with the magnet (23) is formed.
Are formed on the tapered surface, and the flange (21c) is formed so as to become thinner from the inner cylinder (21a) side to the outer cylinder (21b) side. Also, the yoke (21) is chamfered at the flange side end of the inner peripheral edge of the inner cylinder (21a) and at both side ends of the outer peripheral edge of the outer cylinder (21b).
(CH) is given.

-Operating operation- In the third embodiment as well, by supplying an alternating current of a predetermined frequency to the electromagnetic coil (24) of the linear motor (20), the compressor (1) operates in the same manner as in the first and second embodiments. ) Is driven,
Compressed gas is supplied to the expander, and cryogenic cooling occurs at the expander.

In the third embodiment, the joining surface (CP) between the inner cylinder (21a) of the yoke (21) and the permanent magnet (23) is formed as a tapered surface. 4 and 5, the volume of the magnet (23) is increased and the magnetic gap is increased.
The magnetic flux density of (G) increases. The magnetic flux incident on the outer cylinder (21b) from the magnet (23) via the electromagnetic coil (24) is applied to the yoke (2
While bending along the shape of 1), the outer cylinder (21b) and the flange (2
1c), passes through the inner cylinder (21a) in order, and reenters the magnet (23). At this time, the magnetic flux flowing along the inner cylinder (21a) proceeds straight and enters the magnet as in the first embodiment.

Further, in the third embodiment, the cross-sectional shape of the yoke (21) is specified so that the cross-sectional area of the magnetic flux passage becomes substantially constant, and the chamfer (C) is formed at a predetermined corner of the yoke (21).
H) is provided. Therefore, when the magnetic flux flows through the outer cylinder (21b), the flange (21c), and the inner cylinder (21a), it is possible to almost eliminate a useless portion on the magnetic circuit.

-Effect of Third Embodiment- According to the third embodiment, similarly to the first embodiment, the yoke (21)
By forming the joint surface (CP) between the inner cylinder (21a) and the permanent magnet (23) as a tapered surface, it is possible to increase the volume of the magnet (23) while preventing the mechanism from becoming large, G) has a high magnetic flux density. For this reason, while preventing enlargement,
The piston (13) can be efficiently driven with a small current.

Further, the sectional shape of the yoke (21) is specified so that the sectional area of the magnetic flux passage is substantially constant, and a chamfer (CH) is provided at a predetermined corner of the yoke (21). ,
As in the second embodiment, the yoke can be formed in a lean shape in accordance with the magnetic flux distribution, whereby the weight of the yoke can be reduced and the mechanism can be downsized.

Therefore, it is possible to prevent an increase in the size while increasing the performance, to reduce the size while maintaining the performance, and to reduce the size while increasing the performance in a certain range.

[0048]

Other Embodiments of the Invention The present invention may be configured as follows in each of the above embodiments.

For example, in each of the above embodiments, the permanent magnet (23) is mounted on the inner cylinder (21a) of the yoke (21).
A permanent magnet (23) may be mounted on the inner peripheral surface of the outer cylinder (21b) of 1). When the joining surface (CP) is formed as an inclined surface in this manner, it is preferable that the inclined surface has a larger diameter as the distance from the flange (21c) increases.

In the first and third embodiments, the joint surface (CP) between the inner cylinder (21a) of the yoke (21) and the permanent magnet (23) is inclined with respect to the axis of the linear motor (20). Although formed as a tapered surface, the joining surface (CP) may be a surface that is not a tapered surface but inclined while being curved in a spherical shape.

In each of the above embodiments, the chamfer (CH) is formed at the corner between the inner peripheral edge of the inner cylinder (21a) and the outer peripheral edge of the outer cylinder (21b), but the chamfer (CH) is not necessarily provided. It is not necessary.

On the other hand, when the chamfer (CH) is provided at at least one position, the yoke is smaller than when the chamfer (CH) is not provided.
(21) can be reduced in weight, and furthermore, only the useless portions in the magnetic flux distribution are cut, so that the performance does not decrease. As an example of this, as shown in FIG. 3, for example, in the structure of FIG.
Should be provided.

Further, as shown by a virtual line in FIG. 3, a notch (N) having a circumferential groove shape may be provided on the outer peripheral surface of the outer cylinder (21b). The notch (N) is formed at a position where the lower end face of the figure substantially coincides with the upper end faces of the magnet (23) and the electromagnetic coil (24). By providing the notch (N), the weight of the yoke (21) can be reduced without affecting the flow of the lines of magnetic force.

Further, the flange (21c) of the yoke (21)
As shown by phantom lines in FIG. 3, the inner cylinder (21a) and the outer cylinder (2
1b). By doing so, the yoke (21) can be formed in a shape following the flow of the magnetic field lines.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part showing a schematic structure of a linear motor of a vibration compressor according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a schematic structure of a linear motor of a vibration type compressor according to Embodiments 2 and 3 of the present invention.

FIG. 3 is an enlarged sectional view of a main part showing a schematic structure of a linear motor according to another embodiment of the present invention.

FIG. 4 is a sectional view showing a schematic structure of a conventional vibration type compressor.

FIG. 5 is an enlarged sectional view showing a linear motor of the vibration compressor of FIG.

[Explanation of symbols]

 (1) Vibration compressor (11) Cylinder (12) Casing (13) Piston (14) Piston rod (20) Linear motor (21) Yoke (21a) Inner cylinder (21b) Outer cylinder (21c) Flange (22) Bobbin (23) Permanent magnet (24) Electromagnetic coil (G) Magnetic gap

Claims (8)

[Claims] 1. A linear motor (20) for reciprocatingly driving a piston (13), the linear motor (20) comprising an inner cylinder (21a) and an outer cylinder (21b) connected by a flange (21c). Yoke (21), yoke
(21) a permanent magnet (23) fixed to one (21a) of the inner cylinder (21a) and the outer cylinder (21b) to form a magnetic gap (G) with the other (21b); G) a vibrating compressor having an electromagnetic coil (24) located inside the bobbin (22) connected to the piston (13), comprising a yoke (21) and a permanent magnet (23). A vibration type compressor in which a joint surface (CP) is formed on an inclined surface inclined with respect to the axis of the linear motor (20). 2. A joint surface (C) between a yoke (21) and a permanent magnet (23).
The vibration type compressor according to claim 1, wherein P) is formed on a tapered surface. 3. A linear motor (20) for reciprocatingly driving a piston (13), the linear motor (20) comprising an inner cylinder (21a) and an outer cylinder (21b) connected by a flange (21c). Yoke (21), yoke
(21) a permanent magnet (23) fixed to one (21a) of the inner cylinder (21a) and the outer cylinder (21b) to form a magnetic gap (G) with the other (21b); G) a vibrating compressor having an electromagnetic coil (24) located inside the bobbin (22) connected to the piston (13), wherein the yoke (21) has a cross-sectional area of a magnetic flux passage. Is a vibration type compressor in which the cross-sectional shapes of the inner cylinder (21a), the outer cylinder (21b), and the flange (21c) are determined so that is substantially constant. 4. The yoke (21) has an inner cylinder (21a) and an outer cylinder (21b).
4. The vibration type compressor according to claim 3, wherein the compressor is formed to be thicker and the flange (21c) is formed so as to decrease in thickness from the inner cylinder (21a) side to the outer cylinder (21b) side. 5. A linear motor (20) for reciprocatingly driving a piston (13), said linear motor (20) comprising an inner cylinder (21a) and an outer cylinder (21b) connected by a flange (21c). Yoke (21), yoke
(21) a permanent magnet (23) fixed to one (21a) of the inner cylinder (21a) and the outer cylinder (21b) to form a magnetic gap (G) with the other (21b); G) a vibrating compressor having an electromagnetic coil (24) located inside the bobbin (22) connected to the piston (13), comprising a yoke (21) and a permanent magnet (23). The joint surface (CP) is formed on an inclined surface that is inclined with respect to the axis of the linear motor (20) .The yoke (21) has an inner cylinder (21a) such that the cross-sectional area of the magnetic flux passage is substantially constant. ), A vibrating compressor in which the cross-sectional shapes of the outer cylinder (21b) and the flange (21c) are determined. 6. A joint surface (C) between the yoke (21) and the permanent magnet (23).
The vibration type compressor according to claim 5, wherein P) is formed on a tapered surface. 7. The yoke (21) has an inner cylinder (21a) and an outer cylinder (21b).
7. The vibration-type compression according to claim 5, wherein the flange is formed so as to be thinner from the inner cylinder side toward the outer cylinder side. Machine. 8. The yoke (21) is chamfered (C) at at least one of the corners of the inner peripheral edge of the inner cylinder (21a) and the outer peripheral edge of the outer cylinder (21b).
The vibration type compressor according to any one of claims 1 to 7, wherein H) is applied.