JP2869228B2 - compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a refrigerating effect of a Stirling cycle of 100 to 50K (-173 to 223).
The present invention relates to a compressor driven by a linear motor, which is used in a Stirling refrigerator or the like that realizes an extremely low temperature of (° C.) and uses the cold heat for cooling various infrared sensors and high-temperature superconducting devices.

[0002]

2. Description of the Related Art Prior to the present invention, Japanese Patent Laid-Open Publication No.
In the conventional Stirling refrigerator described in Japanese Patent Publication No. 58-58, a sliding device 3 for a refrigerator is formed by providing a displacer 2 in a reciprocating manner inside a casing 1 as shown in FIG. Sliding device 3 and compressor 4
The compressor 4 is driven by a linear motor 5, and a cylindrical center yoke 7 is disposed inside a motor case 6 of the linear motor 5. A compressor piston 8 is arranged inside the cylinder, a cylindrical coil head 9 is attached to the compressor piston 8, and the coil head 9 is engaged with the outer periphery of the center yoke 7 to reciprocate in the axial direction by magnetic force. At the same time, the coil head 9 and the compressor piston 8 are supported on the motor case 6 by only one spring 10.

However, in this type of conventional Stirling refrigerator, the winding direction of the coil 11 of the coil head 9 is not always perpendicular to the magnetic field / stroke direction.
When vibrating, there is a disadvantage that the coil head 9 is slightly rotated, so that the spring 10 is twisted and fatigue is accelerated. In addition, if the current control of the coil 11 is not accurate, the stroke is not stable, and the coil head 9 is not rotated. However, there is a drawback that an accident such as contact with the end 7a of the center yoke 7 is caused.

As shown in FIG. 3, in the conventional Stirling refrigerator driven by two horizontally opposed motors, if the coil head 7 is slightly rotated for the above-mentioned reason, the coil head 7 is not connected to the coil head 7. There is a drawback that leads to an accident such as the lead wire 12 being pulled in the rotation direction and being disconnected.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks and prevents the rotation of the coil head and the contact accident with the center yoke.

[0006]

According to the present invention, there is provided a cylindrical center yoke provided in a housing, a piston reciprocally fitted in the center yoke and defining a compression chamber in the center yoke. A flange-like base end extending in a flange shape at the base end of the piston, a cylindrical coil head attached to the flange-like base end, and the coil engaged with an outer periphery of the center yoke. A linear motor for reciprocating the head in the axial direction, wherein the compressor compresses gas in the compression chamber and supplies the gas to the outside. A compressor in which both ends of the device are attached to the center yoke and the housing, respectively.

[0007]

According to the present invention, since the coil head and the piston of the compressor are supported by the spring device at a plurality of positions at the base end of the flange, undesired rotation of the coil head and the piston of the compressor are prevented. Since both ends of the device are attached to the center yoke and housing, respectively, a spring is interposed not only between the coil head and the housing but also with the center yoke. Can be prevented.

[0008]

Next, as an embodiment of the present invention, a case where the compressor of the present invention is applied to a Stirling refrigerator will be described.

Reference numeral 13 denotes a sliding device for a refrigerator, and a casing 1
A displacer 15 is provided inside 4 in a reciprocating manner. A cold storage material 16 is inserted inside the displacer 15. The displacer 15 is supported by a spring 17 and positioned at an intermediate position of the casing 14, and an expansion chamber 18 and a communication chamber 19 are formed on both sides thereof. The communication chamber 19 is connected to a compressor 21 through a communication pipe 20.

Reference numeral 22 denotes a horizontally opposed linear motor for driving the compressor 21. A cylindrical center yoke 24 is disposed inside a motor case 23 serving as a housing which also serves as a yoke wall. A piston 25 of the compressor 21 is disposed, a base end 25a of the piston 25 is extended outward in a flange shape, and a cylindrical coil head 26 is attached to the flange-shaped base end 25a. The center yoke 24
And reciprocate in the axial direction. Reference numeral 27 denotes a coil wound around a coil head 26, which is supplied with current through a lead wire 28 and generates an axial driving force in relation to the electromagnetic force and the magnet 29. Reference numeral 30 denotes a connection terminal for supplying power to the lead wire 28, which is attached to the lid 31 of the motor case 23. This lid 31
Constitutes a part of the motor case 23.

The linear motor 22 has spring devices 32 and 33 mounted at a plurality of positions on the flange-like base end portion 25a. Each of the spring devices 32 and 33 is provided with the flange-shaped base end 2.
Attach spring stops 34 and 35 to 5a.
The springs 36, 37 are attached to the 4, 4 and 35, and both ends of each spring device 32, 33 are attached to the center yoke 24 and the lid 31, respectively. Regarding the spring devices 32 and 33, those in which spring stops 34 and 35 are attached to the coil head 26 are also implemented.

In the Stirling refrigerator, the pressure of the gaseous refrigerant such as helium and nitrogen compressed in the compression space 38 of the compressor 21 changes sinusoidally, radiating heat of compression during compression. Displacer 15
It is precooled by the cold storage material 16 inside and enters the expansion space 18. The gaseous refrigerant in the expansion space 18 expands due to the movement of the displacer 15 in the casing 14 and the temperature thereof decreases, and
Is lowered to 100 to 50K (-173 to 223 ° C). Thereafter, the gaseous refrigerant in the expansion space 18 is sucked into the compressor 21 in the suction process and returns to the compressor 21. By repeating such a cycle, the gaseous refrigerant is supplied to the refrigerator sliding device 13 and the compressor 21.
Reciprocate between and.

Further, in the above Stirling refrigerator, the coil head 26 and the piston 25 are provided with their flange-shaped base ends 25a.
Are supported by the spring devices 32 and 33 at a plurality of locations, thereby preventing their undesired rotation.
Since both ends of the coil heads 2 and 33 are attached to the center yoke 24 and the motor case 31, respectively, the coil head 26 has the spring 37 interposed not only between the motor case 31 but also with the center yoke 24. Therefore, the contact accident with the center yoke 24 is reliably prevented by the spring 37.

[0014]

Since the present invention is constructed as described above, since the coil head and the piston of the compressor are supported by the spring device at a plurality of positions at the base end of the flange, their undesired rotations are prevented. This prevents breakage of the springs and lead wires. In addition, since both ends of each spring device are attached to the center yoke and the housing (motor case), the coil head is interposed not only between the housing but also the center yoke. Accordingly, it is possible to reliably prevent a contact accident with the center yoke, and thus to provide a compressor capable of maintaining a high capacity even after long-term use.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional example.

FIG. 3 is a partial configuration diagram of another conventional example.

[Explanation of symbols]

 13 Sliding device for refrigerator 14 Casing 15 Displacer 21 Compressor 22 Linear motor 23 Motor case 24 Center yoke 25 Piston 25a Base end 26 Coil head 31 Motor case (lid) 32 Spring device 33 Spring device

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25B 9/14 520

Claims (1)

(57) [Claims] 1. A cylindrical center yoke provided in a housing, a piston reciprocally fitted in the center yoke and defining a compression chamber in the center yoke, and a piston at a base end of the piston. A flange-shaped base end extending in a flange shape, a cylindrical coil head attached to the flange-shaped base end, and the coil head engaged with the outer periphery of the center yoke are reciprocated in the axial direction. A linear motor; and a compressor for compressing gas in the compression chamber and supplying the compressed gas to the outside. At the same time, spring devices are attached to a plurality of locations of the flange-shaped base end portion, and both ends of each spring device are respectively centered. A compressor attached to a yoke and the housing.