JP2822954B2 - Vibrating compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration compressor, and more particularly, to a measure for reusing a permanent magnet constituting a driving unit for reciprocating a piston.

[0002]

2. Description of the Related Art Conventionally, as one type of a small refrigerator that generates cryogenic-level cold, for example, Japanese Patent Laid-Open Publication No.
A free displacer type Stirling refrigerator disclosed in Japanese Patent No. 321 is known. This refrigerator includes a combination of a compressor that compresses refrigerant gas and an expander that expands refrigerant gas discharged from the compressor.

The structure of the compressor will be described. As shown in FIG. 6, the compressor (a) comprises a closed casing.
(b) and a cylinder (c) provided in the casing (b).
And a pair of pistons fitted reciprocally in the cylinder (c) to form a compression chamber (d) in the space inside the cylinder (c).
(e, e) and a linear motor (f) as a drive source for reciprocatingly driving the piston (e). In the cylinder (c), a cylindrical recess (c1) concentric with the center of the cylinder (c) is formed on the outer peripheral side of the compression chamber (d). The linear motor (f) has a permanent magnet (g) disposed in the recess (c1) and bonded to the cylinder (c). Is used as a yoke to form a magnetic field. A substantially inverted cup-shaped bobbin (h) integrally fixed to the piston (e) at the center is provided in the recess (c1) so as to be able to reciprocate, and is provided in the recess (c1). A drive coil (i) is wound around the outer periphery of the bobbin (h), and the drive coil (i) is arranged to face the permanent magnet (g). A lead wire (k) for supplying a current to the drive coil (i) is led out of the bobbin (h) and connected to a current introduction terminal (m) provided on the casing (b). Further, a piston spring (j) comprising a coil spring for elastically supporting the piston (e) reciprocally is provided between the outside of the bottom surface of the bobbin (h) (the side opposite to the piston) and the inside bottom surface of the casing (b). ) Is erected.

When the refrigerator is driven, an alternating current of a predetermined frequency is applied to the drive coil (i) from the lead wire (k), and the drive coil (i) is acted upon by a magnetic field formed around the drive coil (i). Drive bobbin (h) to drive piston
(e) is reciprocated linearly in the cylinder (c), and the compression chamber (d)
Generates a gas pressure of a predetermined cycle, and sends the compressed refrigerant gas to an expander (not shown) by a connecting pipe (n) to expand the refrigerant gas in the expander, thereby causing cold.

[0005]

Incidentally, in this type of conventional compressor, maintenance is periodically performed, and in particular, there is a problem in that the outer peripheral surface of the piston (e) and the inner peripheral surface of the cylinder (c) are separated. If the inner peripheral surface of the cylinder (c) has a large amount of wear in the sliding portion between the cylinders, the cylinder (c) is replaced. In this case, the permanent magnet (g) integrally bonded to the cylinder (c) is also replaced. That is, FIG.
As shown in (1), the cylinder (c) and the permanent magnets (g, g) are integrally removed from the compressor (a) and replaced with a new one.

[0006] In other words, the permanent magnet (g) is replaced despite no damage or wear. In particular, since the permanent magnet (g) is an expensive part, the cost for this maintenance is high, and a configuration that allows the permanent magnet (g) to be reused is required in advance. It had been.

[0007] The present invention has been made in view of this point, and by improving the configuration of the cylinder, it is possible to reuse the permanent magnet even when the cylinder needs to be replaced during maintenance. With the goal.

[0008]

In order to achieve the above object, the invention according to the first aspect of the present invention is a means for dividing a cylinder, one of which is a member worn by a piston, and the other is a member for supporting a magnet. During maintenance, the magnets can be reused by replacing only one of them.

Specifically, as shown in FIG. 1, the invention according to claim 1 is a cylinder member provided in a casing (3).
(4) and the cylinder member (4)
A piston (6) which is disposed so as to be capable of reciprocating relative to (4) and forms a compression chamber (7) with the cylinder member (4); The above casing
(3) Elastic means (14) for elastically supporting reciprocally with respect to
A concave portion (17d) formed on the outer peripheral side of the compression chamber (7) in the cylinder member (4); and a concave portion (17d) provided in the concave portion (17d), and the cylinder member (4) serving as a yoke portion. A magnet (11) forming a magnetic circuit; a cylindrical bobbin (13) connected to the piston (6) and extending into the recess (17d);
3) provided with a coil (12) arranged opposite to the magnet (11) so as to be located in the magnetic field of the magnetic circuit,
A piston is supplied by supplying an electric current to the coil (12).
(6) is reciprocated relative to the cylinder member (4) to compress a fluid in the compression chamber (7). And the cylinder member
(4), a cylinder body (17) having a sliding contact surface for sliding contact with a reciprocating piston (6), and a magnet (11) detachably mounted on the cylinder body (17), and And a magnet supporting member (18) for supporting.

With this configuration, when the compressor is driven, a current is supplied to the coil (12) so that the piston is driven.
(6) reciprocates relative to the cylinder member (4) to compress the fluid in the compression chamber (7). Also, during maintenance of the compressor, the sliding surface of the cylinder body (17) is worn, and when it is necessary to replace the cylinder body (17), the magnet support supporting the magnet (11) is required. The member (18) is separated from the cylinder body (17). Therefore, by replacing only the cylinder body (17) with a new one, the magnet (11) and the magnet support member (18) can be used again.

According to a second aspect of the present invention, in the vibration type compressor according to the first aspect, the cylinder body (17) includes an outer cylinder (17a) fixed to an inner surface of a casing (3); (17
(a) The inner cylinder (17
b) are connected by a connecting portion (17c), while the magnet support member (18) is fitted externally to the outer peripheral side of the inner cylinder (17b), and the magnet (11) is attached to the outer cylinder at the outer peripheral portion. (17a) is constituted by a cylindrical member supported so as to face the same.

With this configuration, when replacing the cylinder body (17), the magnet (11) and the magnet support member (18) can be easily removed by pulling out the magnet support member (18) from the cylinder body (17). (17).

According to a third aspect of the present invention, in the vibratory compressor according to the first or second aspect, the magnet supporting member (18) is provided.
A jig mounting portion to which a detachment jig (23) for detaching the magnet support member (18) from the cylinder body (17) is attached.
(18e, 18e,...).

With this configuration, when pulling out the magnet support member (18) from the cylinder body (17), first, the separation jig (2
3) is attached to the jig mounting portion (18e, 18e,...) Of the magnet support member (18), and by operating the detachment jig (23), the magnet support member (18) is pulled out.

According to a fourth aspect of the present invention, there is provided the vibration type compressor according to the second or third aspect, wherein the connecting portion between the inner cylinder (17b) and the connecting portion (17c) in the cylinder body (17) has a corner portion.
While forming (B), the corner portion (B) on the magnet support member (18)
Form a corner that substantially conforms to the shape of the above, and a magnet support member (18) is attached to one of the two corners by the inner cylinder (17b) of the cylinder body (17).
A gap forming portion (A) which is set back with respect to the mating side is provided so as to form a gap between the two corner portions in a state of being externally fitted to the outside.

According to a fifth aspect of the present invention, in the vibration type compressor according to the second or third aspect, a stepped portion (18a) having a corner portion is formed on the outer peripheral surface of the magnet support member (18). ,
A corner (D) is formed on the magnet (11) so as to conform to the shape of the corner, and the magnet (11) is provided on one of the corners with the magnet support member (1).
In the state supported by 8), a gap forming portion (C) which is set back with respect to the other side is provided so as to form a gap between both corners. With these configurations, interference between the two corners is reliably avoided, and between the cylinder body (17) and the magnet support member (18) or between the magnet (11) and the magnet support member (18).
Since a close contact state in a wide area other than the corner portion between the members can be obtained favorably, the strength of the magnetic field of the magnetic circuit formed by these members can be sufficiently obtained, and the cylinder member ( 4) It is possible to avoid a decrease in magnetic field strength due to the divided structure of.

[0017]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a compressor (1) for a Stirling refrigerator according to the present embodiment. The compressor (1) is a piston-opposed vibratory compressor, has a closed cylindrical casing (3), and a cylinder member (4) is disposed inside the casing (3). ing. The casing (3) includes a cylindrical body (3a) having both open ends, and a disc-shaped closing plate (3b, 3b) for closing open parts at both ends of the cylindrical body (3a).
b) comprising:

The cylinder member (4) includes a cylinder body (17) made of pure iron and a separate yoke (18) as a magnet support member. The cylinder body (17) includes an outer cylinder (17a) fixed to the inner wall of the casing (3) and the outer cylinder.
(17a) Inner cylinder arranged at a position with a predetermined interval inside
(17b) and a donut-shaped connecting portion (17c). On the other hand, in the separate yoke (18), the inner diameter dimension substantially matches the outer diameter dimension of the inner cylinder (17b), and the outer diameter dimension of the outer cylinder is
(17a) is a cylindrical member set to be smaller than the inner diameter of the inner cylinder (17b), the inner surface of the inner cylinder (17b), the inner end surface in the longitudinal direction (the upper separate yoke (18) the lower end surface, lower The upper end surface of the separate yoke (18) is removably mounted on the cylinder body (17) in a state of being in contact with the connecting portion (17c). Thus, a cylindrical recess (17d) concentric with the center of the cylinder member (4) is formed between the inner surface of the outer cylinder (17a) and the outer surface of the separate yoke (18).
Further, the inner cylinder (17b) is a part which becomes an original cylinder, and the center thereof is formed in the piston insertion hole (5).

The pistons (6, 6) are inserted into the piston insertion holes (5) of the cylinder inner cylinder (17b) from both the upper and lower sides in FIG. 1, respectively, and a cylinder is inserted between the pistons (6, 6). A portion surrounded by the inner cylinder (17b) is formed in the compression chamber (7). The outer diameter of the piston (6) is slightly smaller than the inner diameter of the cylinder inner cylinder (17b), and a small gap is formed between the two. It is sealed by 6a) to ensure the airtightness of the compression chamber (7).

A gas passage (8) extending in the radial direction from the piston insertion hole (5) is formed in the cylinder member (4), and the inner end of the gas passage (8) is connected to the compression chamber (7). Opening,
A connecting pipe (9) is connected to the gas passage (8), and the compressor (1) and an expander (not shown) are connected through the connecting pipe (9).

Each of the pistons (6, 6) is a linear motor as a drive source for reciprocatingly driving the piston (6, 6).
It is drivingly connected to (10,10). That is, each of the linear motors (10, 10) includes a permanent magnet (11) and a coil (12). The permanent magnet (11) is a separate yoke (18)
(Permanent magnet)
The outer fitting state of (11) will be described later). Thereby, the cylinder member made of pure iron by the permanent magnet (11)
A magnetic circuit is formed using (4) as a yoke, and a magnetic field of a predetermined strength is formed around the magnetic circuit. In addition, each of the above pistons
(6) is supported by a substantially inverted cup-shaped bobbin (13).
The bobbin (13) has a concave coil winding portion (13a) formed at a position facing the permanent magnet (11) in the outer peripheral portion, and the coil (12a) is formed in the coil winding portion (13a). ) Is wound so that the coil (12) is located in the magnetic field of the magnetic circuit.

Then, an alternating current of a predetermined frequency (for example, 50 Hz) corresponding to a natural frequency determined by the mass of each piston (6, 6) and a spring constant of a spring (14) described later is applied to both linear motors (10, 10). By energizing the coils (12, 12) in synchronization with each other, the pistons (6, 6) reciprocate in opposite directions at the above natural frequency, and a gas pressure of a predetermined cycle is generated in the compression chamber (7). Is configured to generate.

A spring mounting member having a spring mounting seat (16a) is provided inside each of the pistons (6).
(16) is inserted, a through hole is formed at the tip of the piston (6) in the axial direction of the piston (6), and a female screw is formed inside the spring mounting member (16). Yes,
A screw (N) is screwed into the piston (6) from the tip side, whereby a spring mounting member (16) is integrally assembled with the piston (6). In addition, the closing plate (3
A spring mounting seat (3c) having the same shape as above is protrudingly provided at a central portion facing the piston (6) in b), and the piston mounting seat (16a, 3c) extends over each spring mounting seat (16a, 3c).
A coil spring (14) is provided as elastic means for elastically supporting the (6) reciprocally in the cylinder member (4).

Each of the closing plates (3b, 3b) has the coil
Current introduction terminal (19, 1) for supplying current to (12)
9,…). Specifically, the current introduction terminals (19, 19, ...) are arranged in a state of being inserted through through holes (3d) formed in the respective closing plates (3b, 3b) via hermetic seals (22). I have.

Hereinafter, the separate yoke (1) of the permanent magnet (11)
The outer fitting state for 8) will be described. The separate yoke (18) has an outer portion in the longitudinal direction (the vertical direction in FIG. 1) (an upper portion in the upper separate yoke (18), a lower portion in the lower separate yoke (18)) and an inner portion. The upper yoke (18) has a smaller diameter than the lower part, and the lower yoke (18) has a smaller diameter than the upper part, and a step (18a) is formed in the middle part in the longitudinal direction. ing. The permanent magnet (11) has an inner diameter dimension corresponding to the outer diameter dimension of the small diameter portion (18b) of the separate yoke (18), and a vertical dimension corresponding to the vertical dimension of the small diameter portion (18b) of the separate yoke (18). Approximately matched, separate yoke
The step (1) is fitted to the small diameter portion (18b) of (18).
8a) and separate yoke (18) with adhesive etc.
Are integrally adhered to. That is, the permanent magnet (11)
As shown also in FIGS. 2 and 3, it is integrally assembled to the cylinder body (17) via a separate yoke (18).

As a feature of the details of the shape of the separate yoke (18), as shown in FIG. 4 (portion IV in FIG. 2), the inner peripheral surface (18c) abutting on the cylinder body (17) and the inner end surface ( 18d) is slightly chamfered (A) so that the corner ((c)) of the connecting portion between the inner cylinder (17b) of the cylinder body (17) and the connecting portion (17c) is formed. In the case where the corners may interfere with each other as in the case where the cross section of B) is not formed at an accurate right angle (for example, when R is formed as shown in FIG. 4), In addition, the corners (B) enter the gaps formed by the chamfers (A), so that the two (17, 18) can be in good contact with each other. As shown in FIG. 5 (V portion in FIG. 2), a notch (C) having a V-shaped cross section is formed at the corner of the step (18a) of the separate yoke (18). As a result, the inner peripheral surface (11a) of the permanent magnet (11) abutting on the step (18a)
In the case where the cross section of the corner (D) between the inner corner (D) and the inner end face (11b) is not formed exactly at a right angle (for example, when R is formed as shown in FIG. 5), Even if there is a possibility that the two may interfere with each other, the corner (D) enters the portion where the notch (C) is formed, so that the close contact between the two (11, 17) is good. Will be obtained.
Thus, the cylinder body (17) and the separate yoke (1
Since the permanent magnet (8) and the permanent magnet (11) are assembled integrally in a close contact with each other, the strength of the magnetic field of the magnetic circuit can be sufficiently obtained, and the cylinder member (4) has a divided structure. Therefore, it is possible to avoid a decrease in the magnetic field strength.

As shown in FIG. 3, there are a plurality of places on the back surface (left and right outer surfaces in FIG. 3) of the separate yoke (18) when the separate yoke (18) is detached from the cylinder body (17). Screw holes (18e, 18e,...) For screwing a pull-out jig (23) as a detachment jig are formed.

Next, the operation of the compressor (1) configured as described above will be described. During this operation, the compressor
Coil (12,12) of both linear motors (10,10) in (1)
An alternating current of a predetermined frequency (50 Hz) is supplied to the current introduction terminal (1).
9, 19) through a lead wire (not shown) to be energized synchronously, and with this energization, the permanent magnet (11) and the cylinder member
Due to the action of the magnetic field generated in (4), the coils (12, 12) and the pistons (6, 6) reciprocate in opposite directions while deforming the spring (14), and both pistons (6, 6) By moving forward and backward in the cylinder member (4) in synchronism with each other, the volume of the compression chamber (7) increases and decreases, and a pressure wave of a predetermined cycle is generated in the compression chamber (7). And this compression chamber (7) is connected piping
(9), the free displacer reciprocates in the same cycle as the pressure wave in the compression chamber (7), and the expansion of the gas in the expansion chamber causes refrigeration. Will be.

By the way, the compressor (1) is maintained at regular intervals. At the time of the maintenance, the cylinder body (17) slides between the cylinder member (4) and the piston (6). If the inner peripheral surface of the inner cylinder (17b) is worn, the cylinder body (17) must be replaced. In the replacement work of the cylinder body (17), as shown in FIG. 2, after taking out the cylinder member (4) from the casing (3) with the permanent magnet (11) mounted thereon, a jig ( 23) is screwed into a screw hole (18e, 18e,...) On the back surface of the separate yoke (18), and the jig (23) is gripped to hold the separate yoke (18).
From the cylinder body (17) (see the arrow in FIG. 3).
Thereby, the separate yoke (18) and the permanent magnet (11) are separated from the cylinder body (17). And
After assembling the separate yoke (18) and the permanent magnet (11) to a new cylinder body (17) by an operation reverse to the above, these are arranged at predetermined positions in the casing (3). This completes the replacement work of the cylinder body (17).

As described above, according to the structure of this embodiment, the cylinder body (17) in which the inner peripheral surface of the cylinder member (4) is worn is formed.
The permanent magnet (11) is fixed to the separate yoke (18) while making them detachable, so that expensive parts are required for replacement of the cylinder member as in the past. The situation that a certain permanent magnet must be replaced can be avoided, and the permanent magnet (11) can be reused, so that resource saving and maintenance cost can be reduced.

In this embodiment, the cylindrical permanent magnet (1
Although the case where 1) is used has been described, the present invention is not limited to this, and a plurality of divided permanent magnets (11) are
You may apply to the structure adhered to (18).

The permanent magnet (11) is connected to the separate yoke (1).
The permanent magnet (11) is adhered to the separate yoke (18) when the permanent magnet (11) has a cylindrical shape as described above.

[0033]

As described above, according to the present invention, the following effects can be obtained. According to the first aspect of the present invention, the cylinder member includes a cylinder body having a sliding contact surface that slides on a reciprocating piston, and a magnet support that is detachably mounted on the cylinder body and supports a magnet. The maintenance of the compressor enables the magnet to be separated from the cylinder body together with the magnet support member during maintenance of the compressor. At this time, only the cylinder body needs to be replaced with a new one, and the magnet is replaced. Eliminates the need. In other words, it is possible to avoid a situation in which a permanent magnet, which is an expensive part, must be replaced with the replacement work of the cylinder member as in the related art, and this permanent magnet can be reused, thereby saving resources. The cost for promotion and maintenance can be reduced.

According to the second aspect of the present invention, the magnet support member is externally fitted on the outer peripheral side of the inner cylinder of the cylinder body, and the magnet is supported on the outer peripheral portion of the magnet support member. When the main body is replaced, the magnet and the magnet supporting member can be separated from the cylinder main body by a simple operation such as pulling out the magnet supporting member from the cylinder main body, and the working efficiency can be improved.

According to the third aspect of the present invention, the jig mounting portion for mounting the detaching jig on the magnet supporting member is formed,
When the magnet support member is pulled out of the cylinder body, the detachment jig is attached to the jig mounting portion to perform the detachment operation, so that the operability can be improved and the labor for replacing the cylinder body can be reduced.

According to the fourth and fifth aspects of the present invention, the interference between the corners between the magnet support member and the cylinder body or between the magnet and the magnet support member can be reliably avoided, and between these two portions. Since the close contact state in a wide area other than the corners of the above can be satisfactorily obtained, the strength of the magnetic field of the magnetic circuit formed by these members can be sufficiently obtained, and the cylinder member has a divided structure. A decrease in magnetic field strength can be avoided, and the above-described effect of claim 1 can be exhibited while maintaining compressor performance.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an internal structure of a linear motor compressor.

FIG. 2 is a cross-sectional view showing a state where a permanent magnet is mounted on a cylinder member.

FIG. 3 is a cross-sectional view for explaining a replacement operation of a cylinder body.

FIG. 4 is an enlarged view of an IV part in FIG. 2;

FIG. 5 is an enlarged view of a portion V in FIG.

FIG. 6 is a diagram corresponding to FIG. 1 showing a conventional linear motor compressor.

FIG. 7 is a diagram corresponding to FIG. 2 in a conventional example.

[Description of Signs] (1) Vibration compressor (3) Casing (4) Cylinder member (6) Piston (7) Compression chamber (11) Permanent magnet (12) Coil (13) Bobbin (14) Spring (elastic means) (17) Cylinder body (17a) Outer cylinder (17b) Inner cylinder (17c) Connecting part (17d) Depressed part (18) Separate yoke (magnet support member) (18a) Step part (18e) Screw hole (Jig mounting) Part) (23) Pull-out jig (detachable jig)

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-185821 (JP, A) JP-A-4-347460 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25B 9/14 520

Claims (5)

(57) [Claims] A cylinder member (4) provided in a casing (3), and a reciprocating motion relative to the cylinder member (4) is enabled inside the cylinder member (4). And a piston which forms a compression chamber (7) with the cylinder member (4).
(6), an elastic means (14) for elastically supporting the piston (6) so as to reciprocate with respect to the casing (3), and an outer peripheral side of the compression chamber (7) in the cylinder member (4). The recessed portion (17d), the magnet (11) disposed in the recessed portion (17d), and forming a magnetic circuit with the cylinder member (4) as a yoke portion, and the piston (6) are connected to the magnet (11). And a cylindrical bobbin (13) extending into the concave portion (17d), provided on the bobbin (13), and disposed opposite to the magnet (11) so as to be located in the magnetic field of the magnetic circuit. A coil (12), and supplying current to the coil (12) to
(6) is reciprocated relative to the cylinder member (4) to compress the fluid in the compression chamber (7). A cylinder body (17) having a sliding contact surface that slides on a moving piston (6); and a magnet support member (10) detachably mounted on the cylinder body (17) and supporting the magnet (11). 18) A vibratory compressor comprising: 2. A cylinder body (17) comprising: an outer cylinder (17a) fixed to the inner surface of a casing (3); and an inner cylinder (17a) disposed at a predetermined distance inside the outer cylinder (17a). The tube (17b) and the magnet (11b) are connected to each other by a connecting portion (17c), while the magnet support member (18) is externally fitted to the outer peripheral side of the inner cylinder (17b), and the magnet (11) The vibratory compressor according to claim 1, wherein the vibrating compressor is formed of a cylindrical member that supports the outer cylinder so as to face the outer cylinder (17a). 3. The magnet supporting member (18) includes a magnet supporting member.
3. A jig mounting part (18e, 18e,...) To which a separation jig (23) for detaching the (18) from the cylinder body (17) is formed. The vibratory compressor as described. 4. The cylinder body (17) has a corner portion (B) formed at a connecting portion between the inner cylinder (17b) and the connecting portion (17c), while the magnet supporting member (18) has a corner portion (B). A corner portion substantially conforming to the shape of the corner portion (B) is formed, and a magnet support member (18) is provided on one of the corner portions with a cylinder body.
A gap forming portion (A) which is retracted with respect to the other side is provided so as to form a gap between the two corners in a state of being externally fitted to the inner cylinder (17b) of (17). 3. The method according to claim 2, wherein
Or a vibratory compressor according to 3. 5. A step (18a) having a corner portion is formed on the outer peripheral surface of the magnet support member (18), while a corner angle matching the shape of the corner portion is formed on the magnet (11). A part (D) is formed, and a magnet (11) is formed at one of the corners so that a gap is formed between the corners while the magnet (11) is supported by the magnet support member (18). 4. The vibratory compressor according to claim 2, further comprising a clearance forming portion (C) which is set back with respect to the other side.