JPH116658A - Vibration-type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress vibration caused by the inconsistency of the resonance frequency of a movable part and at the same time to reduce the vibration being transferred to a compressor by connecting both movable parts or the movable parts to their move-absorbing equipment by an elastic member. SOLUTION: When AC with a specific frequency is supplied to each linear motor 15, each movable part 20 is reciprocated against a fixing part with a cycle being determined, for example, by the spring constant of an elastic member 25 and a gas is periodically compressed in the compression space in a cylinder 3. At that time, a pair of movable parts 20 is connected each other by the elastic member 25 being shared with the both movable parts thus equally influencing the both movable parts even if the spring constant varies due to a solid difference in the elastic member 25. Therefore, the inconsistency state in the resonance frequency of the both movable parts 20 that is caused by a case where each movable part 20 is independently supported by the elastic member 25 is eliminated and the generation of vibration is suppressed, thus effectively reducing the vibration of a compressor A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating compressor for compressing a gas supplied to an expander, such as a Stirling refrigerator having an expander that generates cryogenic cooling by reciprocating a displacer. , Belongs to the technical field for suppressing the generation of the vibration.

[0002]

2. Description of the Related Art Conventionally, a free displacer type Stirling refrigerator is known as a kind of a small refrigerator which generates cryogenic temperature. This refrigerator is a combination of a vibrating compressor that compresses gas and an expander that expands gas discharged from the compressor.

As the vibration type compressor, for example, Japanese Patent Laid-Open No.
As shown in JP-A-174321, a facing type is known. As shown in FIG. 8, this opposed type compressor has a hermetically sealed housing (101), a cylinder (103) disposed in the housing (101), and a reciprocating piston in the cylinder (103). And a pair of pistons (107), (107) defining a compression space (108) in the longitudinal center of the cylinder (103), and a drive source for reciprocatingly driving each of the pistons (107). The compression space (108) is connected to an expander via a gas passage (109) and a connecting pipe (not shown). Each of the linear motors (115) has a driving magnet (116) formed of an annular permanent magnet disposed around the cylinder (103).
The magnet (116) generates a magnetic field in a cylindrical space concentric with the center of the cylinder (103). In this space, a bobbin (117) integrally fixed to the piston (107) at the center is provided.
A drive coil (118) composed of an electromagnetic coil is wound around the outer periphery of the drive coil. Each of the pistons (107)
A coil spring (125) for elastically supporting the piston (107) in a reciprocating manner is provided between the rear side of the housing and the inner wall surface of the housing (101) facing the open end of the cylinder (103). And a linear motor (11
By supplying an alternating current of a predetermined frequency to the driving coil (118) of 5), the bobbin () is actuated by an electromagnetic force acting between a current flowing through the driving coil (118) and a magnetic field passing through the space by the magnet (116). 117) and the piston (107) integral therewith are driven to drive both pistons (107), (1).
07) are reciprocated in the cylinder (103) so as to be in contact with or separated from each other, whereby a gas pressure of a predetermined cycle is generated in the compression space (108).

On the other hand, although not shown, the expander has a cylindrical cylinder, in which a free displacer for partitioning the inside of the cylinder into an expansion space and a working space is fitted reciprocally. This displacer is filled with a regenerator (regenerative heat exchanger), and the regenerator communicates with the expansion space and the working space. A coil spring for elastically supporting the displacer so as to be able to reciprocate is disposed in the working space. Further, the working space is connected to the compression space (10) of the compressor through the connection pipe.
8), the displacer is reciprocated by the gas pressure from the compressor to expand the gas in the expansion space, thereby generating cold in the cold head at the tip of the cylinder.

[0005]

By the way, in the above-mentioned opposed type vibration type compressor, each piston (10
7) is integrated with the bobbin (117) to form a movable part,
The movable portion is suspended by a coil spring (125) so as to reciprocate based on the neutral position, and the power frequency of the linear motor (115) matches the resonance frequency (natural frequency) of the movable portion. By doing so, high efficiency is achieved. That is, assuming that the spring constant of the coil spring (125) is (Kp), the gas spring constant by gas in the compression space (108) is (Kg), and the mass of the movable part is (Mp), the resonance frequency (f) is f = (1 / 2π) · {(Kp + Kg) / Mp} ^1/2 , and parameters (Kp), (Kg), and (Mp) are determined such that the resonance frequency matches the power supply frequency. .

However, although it is relatively easy to make the mass (Mp) of the movable part coincide between the two movable parts within a certain precision, the spring constant (Kg) of the coil spring (125) is not easily manufactured. To some extent due to individual differences (eg ±
(About 10%) cannot be avoided at present. For this reason, the resonance frequencies of the two movable portions become inconsistent, and vibration occurs. Then, this vibration is transmitted to the housing (101) through the coil spring (125), and the entire compressor vibrates. Due to this vibration, there is a problem that the life of the compressor is shortened or the device is unsuitable for use of a device that dislikes vibration.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the supporting structure of a movable part in the above-mentioned vibration type compressor, so that the vibration caused by the mismatch of the resonance frequency of the movable part is improved. In addition, the vibration itself is hardly transmitted to the housing of the compressor, and the vibration type compressor is effectively reduced in vibration.

[0008]

In order to achieve the above object, according to the present invention, both movable parts or the movable part and its dynamic vibration absorber are connected to each other by an elastic member.

More specifically, FIG.
As shown in FIGS. 3 to 6, the cylinder (3) includes a cylinder (3) and a piston (7) fitted so as to define a compression space (8) in the cylinder (3). One of (7) is a fixed part, and the other is connected to the driving parts (17) and (45) of the linear motor (15), and is connected to the driving parts (17) and (45). A movable part (20) that is relatively movable with respect to the fixed part is formed, and the movable part (20) is reciprocated with respect to the fixed part by the linear motor (15) to cycle gas in the compression space (8). It is intended for a vibration type compressor which is designed to be compressed. The compressor is provided with a pair of movable parts (20), and these movable parts (20), (20) are reciprocally connected to each other by an elastic member (25).

With such a configuration, each linear motor (1
When an alternating current of a predetermined frequency is supplied to 5), each movable unit (2)
0) reciprocates with respect to the fixed portion at a period determined by the spring constant of the elastic member (25) and the like, and the gas is periodically compressed in the compression space (8) in the cylinder (3).

At this time, a pair of movable parts (20), (2)
0) are connected to each other by one shared elastic member (25). Therefore, even if the elastic member (25) has a variation in spring constant due to individual differences, it does not affect both movable parts (20), ( The same applies to 20). Therefore, unlike the case where each movable portion is supported by using an elastic member, the resonance frequency of both movable portions does not become inconsistent, and the generation of vibration can be suppressed. Moreover, the movable part (20) is opposed to the movable part (20).
Are connected only by the elastic member (25) and are not directly connected to the housing (1) of the compressor. Therefore, even if vibration occurs, the vibration causes the elastic member (25) to move. No transmission to the housing (1). Thus, the vibration of the compressor can be effectively reduced.

Further, since one elastic member (25) is shared for supporting both movable parts (20), (20),
The number of the elastic members (25) can be reduced, and the size of the compressor can be reduced by the space of the reduced elastic members (25) to achieve the compactness.

According to the second or third aspect of the present invention, FIG.
As shown in the figure, the fixed part is made up of one cylinder (3). On the other hand, the movable parts (20), (20) are opposed to the pistons (7), (7) fitted in the cylinder (3) so as to define a compression space (8) therebetween. Is included. And in the invention of claim 2,
As shown in FIG. 1, the elastic member (25) connects the opposed portions of the pistons (7) and (7) in the compression space (8). As shown in (1), the elastic member (25) is connected to the pistons (7) and (7).
It is assumed that the drive units of the linear motors (15), (15) that are connected to are connected to each other.

According to the constructions of these inventions, both pistons (7) and (7) are linear motors (15) and (1), respectively.
By the drive of 5), the cylinder reciprocates in the cylinder (3) and comes into contact with and separates from each other, and the compression space (8) between the pistons (7) and (7)
The gas inside is compressed. Also in this case, both movable parts (2
0) and (20) are connected to each other by an elastic member (25) at an opposing portion of the pistons (7) and (7) or at a driving portion of the linear motors (15) and (15). 25) is shared by both movable parts (20), (20), so that the same operation and effect as the first aspect of the invention can be obtained.

In the invention of claim 4, as shown in FIG.
The fixed portion comprises a pair of cylinders (3), (3) arranged concentrically opposite each other at an interval, while the movable portion (2)
The pistons (0) and (20) are arranged in the respective cylinders (3) so as to define a compression space (8) at the end opposite to the opposite cylinder (3). 7). Then, the elastic member (2
5) Assume that the rear sides of the pistons (7), (7) are connected to each other.

According to this configuration, each piston (7) reciprocates in each cylinder (3) by the drive of the linear motor (15), and the compression space (8) in each cylinder (3). The gas is compressed. Also in this case, since the two movable parts (20) are connected to each other by the elastic member (25) on the back side of the piston (7), the same operation and effect as the invention of claim 1 can be obtained. .

According to the fifth aspect of the present invention, as shown in FIG. 5, the fixed portion is formed by one piston (7), while the movable portions (20) and (20) are each provided with a compression space (8) inside. The piston (7) is configured to include cylinders (3) and (3) externally fitted to both ends of the piston (7), and the elastic member (25) includes the cylinders (3) and (3). It is assumed that they are connected to each other. As a result, each cylinder (3) reciprocates with respect to each piston (7) by driving of the linear motor (15).
The gas in the compression space (8) is compressed. Therefore, the same operation and effect as the first aspect can be obtained.

According to the invention of claim 6, as shown in FIG.
A dynamic vibration absorber (47) having the same mass as the movable part (20) of a vibration type compressor similar to the object of the invention of claim 1.
The dynamic vibration absorber (47) and the movable part (20) are connected to be reciprocable by an elastic member (25).

According to this configuration, the linear motor (15)
When the alternating current is supplied to the movable part (20), the movable part (20) reciprocates with respect to the fixed part at a cycle determined by the spring constant of the elastic member (25) and the like, and the gas is cycled in the compression space (8) in the cylinder (3). Compressed. At this time, since the movable part (20) and the dynamic vibration absorber (47) having the same mass as the movable part (20) are connected to each other by the elastic member (25), even if the elastic member (25) has a variation in the spring constant due to individual differences. , Which affect the movable part (20) and the dynamic vibration absorber (47) in the same manner, and the occurrence of vibration can be reduced. In addition, the movable part (2
0) and the dynamic vibration absorber (47) are not directly connected to the housing (1) of the compressor by the elastic member (25). Therefore, even if vibration is generated, the vibration is not transmitted to the housing (1) and the vibration is not transmitted. The vibration of the machine can be reduced.

In the invention of claim 7, FIG. 1, FIG. 3 to FIG.
As shown in FIG. 7, it is assumed that a drive coil (18) is provided in a drive section (17) of the linear motor (15). In the invention of claim 8, as shown in FIG.
The driving magnet (1) is attached to the driving section (45) of the linear motor (15).
6) is provided.

According to the ninth aspect of the present invention, as shown in FIG. 1, a neutral position urging means (urging the movable portion (20) such that the reciprocating neutral position with respect to the fixed portion is maintained at a predetermined reference position. 27) is provided. In this case, the movable portion (20) is always urged to the reference position by the neutral position urging means (27), and the movable portion (20) is not connected to the housing (1). Thus, it is possible to suppress an attempt to deviate from the reference position of the reciprocating neutral position due to this. Therefore, the neutral position of the movable portion (20) in the reciprocating motion can be stably secured at the reference position.

According to the tenth aspect of the present invention, as shown in FIGS. 1 and 2, a detent means (36) is provided for restricting the movable part (20) from rotating around the axis with respect to the fixed part. . Even in this case, the movable part (20) has the housing (1).
Even if it is attempted to rotate due to the fact that it is not connected to the motor, it can be restricted by the rotation preventing means (36).

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 1 shows a vibrating compressor (A) for a Stirling refrigerator according to Embodiment 1 of the present invention, which is combined with a conventionally known free displacer type expander (not shown). This constitutes a refrigerator.

The compressor (A) has a closed cylindrical housing (1) extending horizontally and horizontally. The housing (1) has a cylindrical wall (1) having a center line in the left-right direction.
a) and disk-shaped side walls (1b) and (1b) for hermetically closing the openings at both ends of the cylindrical wall (1a). In the housing (1), one cylindrical cylinder (3) having both ends open and extending in the left-right direction is accommodated so as to be arranged concentrically with the cylindrical wall portion (1a) of the housing (1). A disc-shaped flange (4) extending in a direction perpendicular to the center line of the cylinder (3) is integrally formed on the outer periphery at the center in the longitudinal direction of the cylinder (3). Is formed integrally with a cylindrical fitting part (5) extending in the left-right direction concentrically with the cylinder (3). The cylinder (3), the flange (4) and the fitting part (5) are made of pure iron. And the like, and constitutes a yoke (yoke). The fitting portion (5) is immovably fitted and fixed to the inner periphery of the cylindrical wall portion (1a) of the housing (1), and thus the cylinder (3) is integrally fixed to the housing (1). It is a fixed part.

In the cylinder (3), a cylindrical left and right 1
The pair of pistons (7) and (7) are slidably fitted with their distal ends facing each other, and the portion surrounded by the cylinder (3) between the pistons (7) and (7) is This is a compression space (8). The cylinder (3),
A gas passage (9) is formed in the flange (4) and the fitting portion (5) so as to penetrate in a radial direction from the inner peripheral surface of the cylinder (3) to the outer peripheral surface of the fitting portion (5). The inner end of the gas passage (9) is always in communication with the compression space (8), while the outer end is a through-hole (10) opened in the cylindrical wall (1a) of the housing (1), and the through-hole. It is connected to an expander (not shown) via a connection pipe (11) connected to (10).

The left and right pistons (7), (7) are drivingly connected to linear motors (15), (15) as drive sources for reciprocating the respective pistons (7).
Each of the linear motors (15) has a drive magnet (16) formed of an annular permanent magnet which is fitted and fixed to the outer periphery of the cylinder (3) with an annular space provided between the inner peripheral surface of the fitting portion (5). )
With the driving magnet (16), the outer peripheral surface of the driving magnet (16) and the inner peripheral surface of the fitting portion (5) are formed using the cylinder (3), the flange (4), and the fitting portion (5) as a yoke. A magnetic field of a predetermined strength (static magnetic field) is generated in the space between the two.

Each of the pistons (7) has a flange portion (7a) extending radially outward from the back side, that is, from the end opposite to the center of the cylinder (3). This flange (7
A cylindrical bobbin (17) as a drive unit of a linear motor (15) is integrally connected to the outer periphery of a) at the base end side. The bobbin (17) extends concentrically with the piston (7) toward the center of the cylinder (3), and has a distal end portion formed between the outer peripheral surface of the driving magnet (16) and the inner peripheral surface of the fitting portion (5). Are arranged to be able to reciprocate in the left-right direction. A drive coil (18) composed of an electromagnetic coil is wound around the outer periphery of the bobbin (17) near the front end at a position corresponding to the drive magnet (16). A movable section (20) is constituted by the bobbin (17) and the piston (7) (including the drive coil (18) and an auxiliary coil (28) to be described later), and the movable section (20) is fixed. It is relatively movable with respect to the cylinder (3) as a part. Both ends of the drive coil (18) are connected to a drive power supply via a pair of drive current introduction terminals (22) and (22), which are respectively supported in an insulated state on each side wall (1b) of the housing (1). (2
3), the driving power supply (23) is used to drive the linear motors (15), the driving coils (18) of the (15),
By supplying an alternating current of a predetermined frequency through the respective drive current introduction terminals (22) and (22) in synchronization with (18), both pistons (7) and (7) are connected to a coil spring (2) described later.
It is configured to reciprocate in opposite directions so as to approach and separate from each other at a resonance frequency determined by the spring constant and the like of 5), and generate a gas pressure of a predetermined cycle in the compression space (8).

Further, a spring mounting portion (7b) is integrally formed at the center of the distal end surface of each piston (7), and a spiral spring mounting groove (7c) is formed on the outer periphery of the spring mounting portion (7b). Is formed. The piston (7) has a spring mounting portion (7b) attached thereto.
One end of a coil spring (25) as an elastic member located in the compression space (8) between (7) is immovably mounted by screwing into a spring mounting groove (7c). The other end is immovably attached to the spring mounting portion (7b) of the other piston (7) in the same screwing state with the spring mounting groove (7c). Therefore, both movable parts (2
0) and (20) are reciprocally connected to each other by a coil spring (25) in a compression space (8) in a cylinder (3) at an opposing portion of the pistons (7) and (7).

A neutral position urging mechanism (2) for urging each of the movable parts (20) so that the reciprocating neutral position with respect to the cylinder (3) (fixed part) is maintained at a predetermined reference position.
7) and a detent mechanism (36) for restricting each movable part (20) from rotating around the axis with respect to the cylinder (3). The neutral position urging mechanism (27) includes an auxiliary coil comprising an electromagnetic coil wound adjacent to the drive coil (18) at a predetermined position on the outer periphery of the base end of the bobbin (17) in each of the linear motors (15). Coil (2
8). Both ends of the left auxiliary coil (28) are insulated from the left side wall (1b) of the housing (1) and supported by a pair of positioning current introduction terminals (29), (2).
Positioning current introduction terminals (29), (29) which are similarly supported through the first DC power supply (30) through the 9) and the both ends of the right auxiliary coil (28) through the right side wall (1b).
Are connected to the second DC power supply (31), respectively. Further, on the inner periphery of the cylindrical wall portion (1a) of the housing (1), a right position sensor (32) for detecting that the right movable portion (20) (the right piston (7) or the like) has approached near the right end thereof. A left position sensor (33) for detecting that a left movable portion (20) (left piston (7), etc.) has approached is attached near the left end of the inner periphery of the cylindrical wall portion (1a). (32) is connected to the first DC power supply (30), and the left position sensor (33) is connected to the second DC power supply (31). Then, for example, both the movable parts (20), (20) are moved to the left (right) as a whole from the reference position of each reciprocating neutral position, and the left movable part (20) (the right movable part (20)) is moved. When approaching the position of the left position sensor (33) (the right position sensor (32)), the second DC power supply (31) (the first DC power supply (30)) detects the detection signal of the sensor (33) (or (32)). ))
To the right linear motor (15) (the left linear motor (1
5)) Auxiliary coil (28) on bobbin (17)
To the movable part (20), (20) by the magnetic force between the current of the auxiliary coil (28) and the magnetic field of the driving magnet (16) of the linear motor (15). ), Each movable part (2
0) is held at the reference position of the reciprocating neutral position.

On the other hand, the anti-rotation mechanism (36) includes a magnet fixing plate (37) mounted and fixed on the inner wall surface of each side wall (1b) in the housing (1) at a predetermined distance from the inner wall surface. Have. A circular opening (38) concentric with each of the pistons (7) (cylinder (3)) is formed through the center of the magnet fixing plate (37).
A ring-shaped non-rotating fixed magnet (39) is provided on the periphery of 8).
Is attached and fixed. This detent fixed magnet (39)
As shown in FIG. 2, two divided magnets (39) having a semicircular arc shape having an N-pole on the inner periphery and an S-pole on the outer periphery are shown in FIG.
a), (39a), and conversely, two similar split magnets (39b), the inner magnet of which has an S pole and the outer magnet of which has an N pole.
(39b) and adjacent divided magnets (39a), (39).
The magnetic poles on the inner peripheral side in b) are connected in a ring shape so as to be different from each other. On the other hand, a columnar magnet mounting portion (7d) is integrally provided at the center of the back surface of each piston (7),
A cylindrical detent movable magnet (40) inserted into the detent fixed magnet (39) is attached and fixed to the outer peripheral surface of the magnet attachment part (7d). As shown in FIG. 2, the non-rotating movable magnet (40) has two magnets (40a) and (40a) each having a semicircular cross section of four semicircles having an inner peripheral side having an N pole and an outer peripheral side having an S pole. Two similar split magnets (40b) with an inner pole on the south pole and an outer pole on the north pole,
(40b) and adjacent divided magnets (40a), (40
The outer peripheral magnetic poles of b) are connected in a cylindrical shape so as to be different from each other. And the detent fixed magnet (39)
Due to the magnetic force (attraction or repulsion) between the four different magnetic poles on the inner peripheral side and the four different magnetic poles on the outer peripheral side of the detent movable magnet (40), each movable part (20) is Even during the reciprocating movement, rotation around the axis with respect to the cylinder (3) is restricted.

Next, the operation of the above embodiment will be described. With the start of operation of the refrigerator, the drive coils (1) of both linear motors (15) and (15) in the compressor (A) are
8) and (18), an alternating current of a predetermined frequency is synchronously supplied from the driving power supply (23). With this energization, both movable parts (20), (20) comprising the bobbin (17) and the piston (7) are moved by the action of the electromagnetic force of the drive coil (18) and the drive magnet (16). The coil spring (25) between (7) and (7) is reciprocated in the opposite direction so as to come into contact with and separate from the neutral position while expanding and contracting. The volume increases and decreases, and a pressure wave of a predetermined cycle is generated in the compression space (8). Since the compression space (8) communicates with the expander through the connecting pipe (11), the displacer in the expander reciprocates at the same cycle as the pressure wave in the compression space (8), and moves in the expansion space. Due to the expansion of the gas, cold occurs, and the reciprocating movement of the displacer cools the cold head at the tip of the cylinder to an extremely low temperature.

At that time, a pair of left and right movable parts (20) and (20) of the compressor (A) are commonly used in the cylinder (3) at one end of the piston (7) and (7). Since they are connected to each other by a coil spring (25),
Even if the coil spring (25) has a variation in spring constant due to individual differences, the influence of the variation affects both movable parts (20),
(20) works in the same way. For this reason, unlike the conventional example (see FIG. 8) in which each movable portion is elastically supported on the housing by a coil spring, the resonance frequency of both movable portions does not become inconsistent due to the difference in the spring constant.
Occurrence of vibration of the compressor (A) can be reduced.

Moreover, since each movable part (20) is connected only to the other movable part (20) by a coil spring (25) and is not directly connected to the housing (1), it is in a free state. Even if vibration is generated, the vibration is not transmitted to the housing (1) via the coil spring (25). As a result, the vibration of the compressor (A) can be effectively reduced by these synergistic effects, and the life of the compressor (A) can be prolonged. Can be used stably without any problem.

Further, since one coil spring (25) is commonly used for connecting and supporting the movable portions (20), (20), the number of coil springs (25) is reduced as compared with the conventional example. The size of the compressor (A) can be reduced by the reduced space of the coil spring (25).

Further, in this embodiment, each movable part (2
Since 0) is not connected to the housing (1), the neutral position of the reciprocating motion tends to deviate from the reference position.
The displacement of the movable part (20) is controlled by the neutral position urging mechanism (27).
The movable part (20) is constantly biased and held at the reciprocating neutral position. Specifically, for example, both movable parts (20), (20) move to the left (right side) from the reference position of each reciprocating neutral position as a whole to move the left movable part (20) (right movable part (20) )) Approaches the position of the left position sensor (33) (right position sensor (32)), the second DC power supply (31) (first) receiving the detection signal of the sensor (33) (or (32)). DC power supply (3
0)), a direct current is supplied to the auxiliary coil (28) on the bobbin (17) in the right linear motor (15) (the left linear motor (15)), and the current from the auxiliary coil (28) and the linear motor (15) are supplied. The two movable parts (20),
(20) is pushed rightward (leftward) and moves. In this way, each movable part (20) can be stably held at the reference position of the reciprocating neutral position, and the neutral position of the movable part (20) shifts from the reference position during operation of the compressor (A). Thus, the performance of the compressor (A) can be secured by preventing collision with the housing (1).

For the same reason as described above, even if the movable portions (20), (20) try to rotate with respect to the cylinder (3), the rotation is restricted by the rotation preventing mechanism (36). That is, the detent mechanism (36) is attached to the detent fixed magnet (39) attached and fixed to each side wall (1b) of the housing (1), and attached to the back side of the piston (7) of each movable part (20). The detented movable magnet (4
0), four magnetic poles on the inner peripheral side of the detent fixed magnet (39) on the housing (1) side, and four magnetic poles on the outer peripheral side of the detent movable magnet (40) on the movable part (20) side. Are stable if they have opposite polarities and match in the circumferential direction. In this stable state, the movable part (20) is rotated in one direction relative to the cylinder (3) by an external force or the like, and rotates with the magnetic pole on the inner peripheral side of the detent fixed magnet (39). When the polarity of the magnetic pole on the outer peripheral side of the stop movable magnet (40) is shifted, the magnetic poles of the magnets (39) and (40) are alternately different in the circumferential direction. Movable magnet (40) that prevents magnetic poles from rotating around
The magnetic poles having different outer peripheries are attracted and the same magnetic poles are repelled. The movable portion (20) is returned to the stable state by the attraction and repulsion between the magnets (39) and (40).
Therefore, each movable part (20) is prevented from rotating around the axis with respect to the cylinder (3), and the rotation causes the coil spring (25) to be screwed and fixed to the tip of each piston (7). Loosen the drive coil (18) or auxiliary coil (2
By preventing the lead wire of 8) from being wound around the surrounding portion and being damaged, the performance of the compressor (A) can be stabilized and the life can be prolonged.

In the above embodiment, the position sensor (3
2) and (33), DC is supplied from the DC power supplies (30) and (31) to the auxiliary coils (28) and (28) only when the proximity of each movable part (20) is detected.
Direct current may be continuously supplied to each auxiliary coil (28) without providing the position sensors (32) and (33), and the movable part (20) is biased to the neutral position as in the above embodiment. Is obtained. However, from the viewpoint of reducing the power consumption, the sensor (32),
It is preferable to supply a direct current only at the time of detecting (33).

Further, the auxiliary coil (28) can be wound around the bobbin (17) on the outside or inside of the drive coil (18) in a state of being overlapped therewith. Further, in addition to the electromagnetic force generated by the drive coil (18), the movable portions (20) may be biased and held at the neutral position by using an attractive force or a repulsive force between the permanent magnets. Can use means other than magnetic force.

Further, in the above embodiment, the number of magnetic poles of each of the magnets (39) and (40) of the detent mechanism (36) is four, but if the number is two or six or more, the number is even. Good. Further, an electromagnet can be used instead of the permanent magnet, and further, means other than magnetic force may be used.

(Embodiment 2) FIG. 3 shows Embodiment 2 of the present invention.
(Note that in the following embodiments, the same parts as those in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted). In the first embodiment, both movable parts (20), ( 2
0) are connected by a coil spring (25) in the compression space (8) at the tip of each piston (7), whereas they are connected by the tip of the bobbin (17) of the linear motor (15). It was done.

That is, in this embodiment, a plurality of spring insertion holes (43), (43),... Are provided at circumferentially spaced positions on the flange (4) on the outer periphery of the cylinder (3).
The coil spring (25) is inserted through each of the spring insertion holes (43). Both ends of each coil spring (25) are respectively connected to each linear motor (15).
Of the bobbin (17), the coil spring (25) is connected to the pistons (7) and (7).
The bobbins (17) and (17) serving as drive units of the linear motors (15) and (25) connected to each other are connected to each other. The other configuration is the same as that of the first embodiment. Although not shown, a neutral position urging mechanism (27) and a rotation preventing mechanism (36) are also provided.

Therefore, this embodiment can also provide the same functions and effects as those of the first embodiment. The coil spring (25) (flange (4)) in this embodiment
The spring insertion holes (43) need not always be plural, but may be one.

(Embodiment 3) FIG. 4 shows Embodiment 3.
The compression space (8) is arranged at both left and right ends of the housing (1). That is, in this embodiment, the cylinders (3) and (3) as fixing portions are concentrically opposed and fixed to both left and right end portions in the housing (1), respectively. 1)
A fitting part (5) is provided on the outer periphery on the end side via a flange (4).
The cylindrical space surrounded by the cylinders (3), the flanges (4) and the fitting portions (5) is open toward the center of the housing (1). A piston (7) is fitted into each of the cylinders (3) from the left and right central sides of the housing (1), and a distal end of each of the pistons (7) and a side wall (1b) of the housing (1). A compression space (8) is formed between them. That is, a compression space (8) is defined at an end of each cylinder (3) opposite to the opposite cylinder (3).
This compression space (8) is formed on the side wall (1) of the housing (1).
The connecting pipe (not shown) connected to the through-hole (10) formed through b) and connected to this through-hole (10) is assembled with the other connecting pipe and connected to an expander (not shown). ing.

The drive magnet (16) of each linear motor (15) is mounted on the outer periphery of the cylinder (3) near the center of the housing (1), and the bobbin (17) is fitted to the drive magnet (16) and the fitting portion ( The bobbin (17) is inserted into the space between the housing (1) and the piston (7) located at the center of the housing (1) in the space between the housing (1) and the rear flange portion (7a). It is connected to.

A coil spring (25) is provided between the center portions on the rear side of the pistons (7) and (7).
As a result, the two movable parts (20), (20) are connected to each other on the back side of the pistons (7), (7). Other configurations are the same as those of the first embodiment.

Therefore, in the case of this embodiment, each piston (7) reciprocates in each cylinder (3) by the drive of the linear motor (15), and the compression space (8) in each cylinder (3). The gas inside is compressed. And also in this embodiment, since both movable parts (20), (20) are mutually connected by the coil spring (25) on the back side of the pistons (7), (7), the first embodiment is different from the first embodiment. A similar effect can be obtained.

(Embodiment 4) FIG. 5 shows Embodiment 4.
In each of the above embodiments, the piston (7) is reciprocated with respect to the cylinder (3) by the linear motor (15), whereas the moving cylinder type in which the cylinder (3) is moved with respect to the piston (7). It is what it was.

That is, in this embodiment, one cylindrical piston (7) is disposed inside the housing (1) as a fixed portion extending concentrically with the housing (1) in the left-right direction. A flange (4) is formed on the outer periphery of a central portion in the longitudinal direction, and a fitting portion (5) is integrally formed on the outer periphery of the flange (4). And it is fixed to the housing (1) by the fitting part (5).

At the left and right ends of the piston (7), bottomed cylindrical cylinders (3) and (3) are respectively fitted and supported, and the piston (7) is inserted into each of the cylinders (3).
Defines a compression space (8). The gas passage (9) connected to each of the compression spaces (8) passes through the center of the piston (7) toward a central position in the longitudinal direction thereof, and then radially outwardly from the central position with a flange (9). 4) and extends to the outer peripheral surface of the fitting portion (5), and the outer end of the gas passage (9) is a cylindrical wall portion (1a) of the housing (1).
Is connected to the expander through a through-hole (10) opened to the through hole and a connecting pipe (not shown) connected to the through-hole (10).

The driving magnet (1) of each linear motor (15)
6) is attached near the end of the housing (1) on the inner periphery of the fitting portion (5). The side wall (3a) of the cylinder (3) is inserted from the end of the housing (1) into the space between the drive magnet (16) and the piston (7). Drive coil (18)
Is wrapped around. That is, the cylinder (3) is driven and connected to the linear motor (15) in a state where the side wall (3a) is also used as a bobbin (drive unit) of the linear motor (15). The movable portion (20) is constituted by the coil (18).

A plurality of spring insertion holes (43) (only one is shown) are formed in the flange (4) on the outer periphery of the piston (7) at circumferentially spaced positions. The coil spring (25) is inserted through the insertion hole (43). Both ends of each of the coil springs (25) are located at the periphery of the opening of each cylinder (3) (each linear motor (1)).
5), and the coil spring (25) connects the cylinders (3) and (3) to each other. Other configurations are the same as the first embodiment.

Therefore, in this embodiment, each cylinder (3) reciprocates with respect to the piston (7) by the drive of the linear motor (15), and the compression space (8) in each cylinder (3). Gas is compressed. In this embodiment, the same operation and effect as those of the first embodiment can be obtained. In this embodiment, as in the second embodiment, the coil spring (25) (flange (4)) is used.
Of the spring insertion hole (43)).

(Embodiment 5) FIG. 6 shows Embodiment 5.
In each of the above embodiments, the bobbin (17) around which the drive coil (18) is wound is used as the drive unit of the linear motor (15), whereas the drive magnet (16) side is replaced with the drive unit.

This embodiment is basically the same as the first embodiment (see FIG. 1), and each linear motor (1
Only the structure of 5) is different. That is, the drive coils (18) are arranged and fixed on the inner peripheral surfaces of both ends of the fitting portion (5). On the other hand, the flange (7) on the rear side of each piston (7)
a) A cylindrical magnet mounting portion (45) serving as a driving portion of a linear motor (15) is integrally connected to the outer periphery on the base end side, and the magnet mounting portion (45) is connected to the piston (7). It extends concentrically toward the center of the cylinder (3) and has a tip portion reciprocally movable in the left-right direction in a space between the outer peripheral surface of the cylinder (3) and the inner peripheral surface of the drive coil (18). The drive coil (1) is provided on the outer periphery near the tip of the magnet mounting portion (45).
A driving magnet (16) is integrally fixed at a position corresponding to (8). And the movable part (20) is comprised by the magnet mounting part (45) and the piston (7).

In this embodiment, each linear motor (1
When an alternating current for driving is supplied to the driving coil (18) of (5), the magnet flows due to the interaction between the current flowing through the driving coil (18) and the magnetic field of the driving magnet (16) on the magnet mounting portion (45) side. The mounting portion (45) and the piston (7) integral therewith reciprocate, and the gas is compressed in the compression space (8) between the pistons (7), (7). Therefore, in this embodiment, the same operation and effect as those of the first embodiment can be obtained.

(Embodiment 6) FIG. 7 shows Embodiment 6.
In the above embodiments, the piston (7) and the cylinder (3)
And a pair of linear motors (15), each of which is provided one by one. Instead, a dynamic vibration absorber is used as a movable part on the other side, and this is connected to a coil spring (2).
It is connected to the movable part (20) by 5).

That is, in this embodiment, the structure of the compressor (A) is the same as one half of the third embodiment (see FIG. 4), and one cylinder (3) is provided in the left half of the housing (1). ) (Fixed part), flange (4), fitting part (5), piston (7) and linear motor (15) are provided, and compression space (8) is formed in piston (7) in cylinder (3). Is partitioned.

On the other hand, a dynamic vibration absorber (47) is arranged in the right space in the housing (1) so as to be able to reciprocate in the left-right direction. The dynamic vibration absorber (47) comprises a movable part (20) comprising the piston (7) and a bobbin (17) of the linear motor (15) (specifically, including a drive coil (18) and an auxiliary coil (not shown)). And the same mass. And
The movable part (20) and the dynamic vibration absorber (47) are connected by a coil spring (2).
5) are reciprocally connected. Other configurations are the same as those of the first embodiment.

Therefore, in this embodiment, when an alternating current having a predetermined frequency is supplied to the linear motor (15), the movable part (20) comprising the bobbin (17) and the piston (7) is moved inside the cylinder (3). Reciprocating at a predetermined cycle, and the gas is periodically compressed in the compression space (8) in the cylinder (3). Since the dynamic vibration absorber (47) having the same mass as the movable part (20) is connected to the movable part (20) by the coil spring (25), even if the coil spring (25) has a variation in spring constant, it is movable. Part (20) and dynamic vibration absorber (4
7) is similarly affected, and the occurrence of vibration can be reduced. In addition, the movable part (20) and the dynamic vibration absorber (47)
Are in a free state and are not directly connected to the housing (1) of the compressor (A), so that even if vibration is generated, it is not transmitted to the housing (1). Therefore, the vibration of the compressor (A) can be reduced.

The structure in which the drive magnet (16) side of the linear motor (15) is used as a drive unit as in the fifth embodiment is described below.
It may be applied to the second, third, fourth or sixth embodiment.

Further, in each of the above embodiments, the elastic member is constituted by the coil spring (25). However, it goes without saying that an elastic member other than the coil spring (25) may be used. Further, each of the above embodiments is the case of the horizontal compressor (A) that moves the movable part (20) in the horizontal direction.
The present invention can also be applied to a vertical vibration compressor in which the movable part (20) is moved vertically up and down.

[0062]

As described above, according to the first aspect of the present invention, one of the cylinder and the piston is a fixed part, and the other is a movable part relatively movable with respect to the fixed part. A pair of movable parts were connected to each other by an elastic member so as to be able to reciprocate with respect to a vibration type compressor in which gas was reciprocated to periodically compress gas in a compression space in a cylinder. According to the second aspect of the present invention, the fixed portion is formed of one cylinder, while the movable portion includes a piston which is opposed to the inside of the cylinder so as to define a compression space therebetween. The elastic member connects the opposing parts of the pistons in the compression space. Further, in the invention of claim 3, the elastic member connects the drive units of the linear motor connected to the piston. Further, in the invention according to claim 4, the fixed portion comprises a pair of cylinders which are concentrically opposed to each other with an interval therebetween, while the movable portion is provided at an end of each cylinder opposite to the opposite cylinder. Each piston includes a piston fitted in each cylinder so as to define a compression space, and the elastic member connects the rear sides of both pistons. According to the fifth aspect of the present invention, the fixed portion is formed of one piston, while the movable portion includes cylinders externally fitted to both ends of the piston so as to define a compression space therein. The elastic member connects the cylinders. Claim 6
According to the invention, a dynamic vibration absorber having the same mass as the movable part is provided, and the dynamic vibration absorber and the movable part are connected to be reciprocable by an elastic member. According to the invention of claim 7, the drive unit of the linear motor is on the coil side, and in the invention of claim 8, the drive unit of the linear motor is on the magnet side.

Therefore, according to these inventions, even if the elastic member has a variation in spring constant due to individual differences, the generation of vibration can be reduced, and even if the vibration occurs, it is transmitted to the housing via the elastic member. Therefore, the vibration of the compressor can be reduced, and the life of the compressor can be prolonged and the compressor can be stably applied to a device requiring low vibration. In particular, according to the first to fifth aspects of the present invention, the size of the compressor can be reduced by the reduced space of the elastic member, and the compressor can be made more compact.

According to the ninth aspect of the invention, the movable portion is biased to the reference position of the reciprocating neutral position with respect to the fixed portion, so that the movable portion is not connected to the housing. By preventing the neutral position from deviating from the reference position, the reciprocating neutral position of the movable portion can be properly secured, and therefore, the performance and reliability of the compressor can be stabilized.

According to the tenth aspect of the present invention, the performance of the compressor is stabilized and the reliability is improved by restricting the movable portion from rotating around the axis with respect to the fixed portion. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a vibration type compressor according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a schematic sectional view showing a vibration type compressor according to Embodiment 2 of the present invention.

FIG. 4 is a diagram corresponding to FIG. 3, showing a vibration type compressor according to Embodiment 3 of the present invention.

FIG. 5 is a diagram corresponding to FIG. 3, showing a vibration type compressor according to Embodiment 4 of the present invention.

FIG. 6 is a diagram corresponding to FIG. 3, illustrating a vibration type compressor according to Embodiment 5 of the present invention.

FIG. 7 is a diagram corresponding to FIG. 3, showing a vibratory compressor according to Embodiment 6 of the present invention.

FIG. 8 is a sectional view showing a conventional example of a vibration type compressor.

[Explanation of symbols]

 (A) Vibration compressor (1) Housing (3) Cylinder (3a) Side wall (7) Piston (8) Compression space (15) Linear motor (16) Drive magnet (17) Bobbin (drive) (18) Drive Coil (20) Movable part (25) Coil spring (elastic member) (27) Neutral position urging mechanism (neutral position urging means) (36) Rotation prevention mechanism (rotation prevention means) (45) Magnet mounting part (drive part) (47) Dynamic vibration absorber

Claims (10)

[Claims] A cylinder (3) and a piston (7) fitted in the cylinder (3) so as to define a compression space (8), wherein the cylinder (3) or the piston (7) One is a fixed portion, and the other is connected to the driving portions (17) and (45) of the linear motor (15) and is connected to the driving portion (1).
7) and (45) constitute a movable part (20) that can move relative to the fixed part. The movable part (20) is reciprocated with respect to the fixed part by the linear motor (15). A vibratory compressor configured to periodically compress a gas in a compression space (8), wherein a pair of the movable parts (20) is provided, and the two movable parts (20) and (20) are connected to each other. Is an elastic member (2
5) A vibrating compressor which is reciprocally connected by (5). 2. The vibratory compressor according to claim 1, wherein the fixed portion comprises one cylinder, and the movable portions define a compression space therebetween. Piston (7), (7) fitted in the cylinder (3) so as to face each other, and the elastic member (25) includes a piston (7) in the compression space (8). , (7), wherein the opposing portions are connected to each other. 3. The vibrating compressor according to claim 1, wherein the fixed portion comprises one cylinder, and the movable portions define a compression space therebetween. The piston (7), (7) fitted in the cylinder (3) so as to face each other, and the elastic member (25) is connected to the piston (7), (7). A vibrating compressor characterized by connecting the drive units of the linear motors (15) and (15). 4. The vibrating compressor according to claim 1, wherein the fixed portion comprises a pair of cylinders (3) and (3) which are concentrically opposed to each other with a space therebetween, and the movable portion (20). ) And (20) are pistons fitted in the respective cylinders (3) so as to define compression spaces (8) at opposite ends of the respective cylinders (3) opposite to the opposed cylinders (3). (7) The vibration-type compressor, wherein the elastic member (25) connects the rear sides of the pistons (7) and (7) to each other. 5. The vibration type compressor according to claim 1, wherein the fixed portion comprises one piston, while the movable portions define a compression space inside each of them. The piston (7) includes cylinders (3) and (3) externally fitted to both ends of the piston (7). An elastic member (25) connects the cylinders (3) and (3) to each other. A vibration-type compressor. 6. A cylinder (3) and a piston (7) fitted so as to define a compression space (8) in the cylinder (3), wherein the cylinder (3) or the piston (7) One is a fixed portion, and the other is connected to the driving portions (17) and (45) of the linear motor (15) and is connected to the driving portion (1).
7) and (45) constitute a movable part (20) that can move relative to the fixed part. The linear motor (15) reciprocates the movable part (20) with respect to the fixed part to compress the movable part. A vibratory compressor (4) that periodically compresses gas in a space (8), the dynamic vibration absorber (4) having the same mass as the movable part (20).
7), wherein the movable section (20) and the dynamic vibration absorber (47) are reciprocally connected by an elastic member (25). 7. The vibration type compressor according to claim 1, wherein a drive coil (18) is provided in a drive section (17) of the linear motor (15). Machine. 8. The vibratory compressor according to claim 1, wherein a driving magnet (1) is provided to a driving section (45) of the linear motor (15).
6) A vibration type compressor provided with: 9. A vibration-type compressor according to claim 1, wherein said movable portion (20) is biased such that a reciprocating neutral position relative to said fixed portion is maintained at a predetermined reference position. A vibrating compressor comprising a biasing means (27). 10. The vibrating compressor according to claim 1, further comprising a detent means (36) for restricting the movable part (20) from rotating about an axis with respect to the fixed part. A vibration type compressor characterized by the above-mentioned.