JP2001182652A - Linear compressor - Google Patents

Linear compressor

Info

Publication number
JP2001182652A
JP2001182652A JP37223899A JP37223899A JP2001182652A JP 2001182652 A JP2001182652 A JP 2001182652A JP 37223899 A JP37223899 A JP 37223899A JP 37223899 A JP37223899 A JP 37223899A JP 2001182652 A JP2001182652 A JP 2001182652A
Authority
JP
Japan
Prior art keywords
piston
shaft
cylinder
linear compressor
compression chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP37223899A
Other languages
Japanese (ja)
Inventor
Mikio Hojo
Yasuhiko Yokoi
三木夫 北條
康彦 横井
Original Assignee
Sanyo Electric Co Ltd
三洋電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd, 三洋電機株式会社 filed Critical Sanyo Electric Co Ltd
Priority to JP37223899A priority Critical patent/JP2001182652A/en
Publication of JP2001182652A publication Critical patent/JP2001182652A/en
Pending legal-status Critical Current

Links

Abstract

(57) [Summary] [PROBLEMS] Even when the parallelism between the cylinder axis and the shaft axis is lost, the piston prevents the cylinder from coming into contact with the cylinder, thereby maintaining the reliability of the sliding part and improving the device efficiency. Prevent drop. SOLUTION: The present invention is characterized in that a cylinder 6 provided in a housing 1 is fitted in the cylinder 6 so as to be able to reciprocate,
A piston 7 defining a compression chamber in a cylinder 6, a shaft 12 having one end connected to the piston 7, and a linear motor 17 for reciprocally driving the piston 7 and the shaft 12 by applying an AC voltage of a predetermined frequency. Wherein the piston 7 is supported so as to be movable in a radial direction orthogonal to the axial direction of the shaft 12, Are held so as to be able to swing around a predetermined location.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear compressor for compressing gas and supplying the compressed gas to the outside by reciprocating a piston fitted in a cylinder by a linear motor.

[0002]

2. Description of the Related Art In recent years, a linear compressor has been developed as a mechanism for compressing and supplying a refrigerant gas in a refrigeration system. For example, as shown in FIG. 4, a housing 101 having a bottomed cylindrical body, a magnetic frame 102 made of low carbon steel formed at an upper end opening of the housing 101, and a cylinder 103 formed at the center of the magnetic frame 102 When,
Reciprocally fitted in the cylinder 103, the cylinder 10
Piston 105 for forming compression chamber 104 in inner space 3
And a linear motor 106 as a drive source for driving the piston 105 back and forth.

In the linear motor 106, an annular permanent magnet 107 is arranged concentrically outside the cylinder 103 and is fixed to the housing 101. This magnet 10
A magnetic field B is generated in a cylindrical gap 108 concentric with the center of the cylinder 103 by a magnetic circuit including the magnetic frame 7 and the magnetic frame 102. The gap 105 has a piston 105 at the center.
Cylindrical movable body 10 made of resin integrally fixed to
A coil spring 110 for elastically supporting the movable body 109 and the piston 105 so as to reciprocate is fixed to the housing 101.

A magnet 107 is mounted on the outer periphery of the movable body 109.
The electromagnetic coil 111 is wound at a position facing the
By passing an alternating current of a predetermined frequency through a lead wire (not shown), the coil 111 and the movable body 109 are driven by the action of a magnetic field passing through the gap 108, and the piston 10
5 is reciprocated in the cylinder 103 to generate a gas pressure in a predetermined cycle in the compression chamber 104.

On the other hand, as a typical refrigeration system, FIG.
As shown in FIG. 1, a hermetic refrigeration system in which a linear compressor 121 (compressor), a condenser 122, an expansion valve 123, and an evaporator 124 are connected by a gas flow path pipe 125 is known. The refrigerant gas vaporized by the condenser 124 is sucked through a gas flow pipe 125 and compressed to a high pressure, and the high pressure refrigerant gas is discharged to the condenser 122 through the gas flow pipe 125.

For this reason, as shown in FIG.
4 includes a valve mechanism 1 provided at the upper end of the cylinder 103.
12, a gas flow path pipe 12 outside the housing 101.
5 is connected. The valve mechanism 112 is connected to the gas flow pipe 1
The suction valve 112a allows only the suction of the refrigerant gas from the evaporator 124 through the inlet 25, and the discharge valve 112b allows only the discharge of the refrigerant gas to the condenser 122 through the gas flow pipe 125. You. The suction valve 112 a is a valve that causes a gas to flow in the direction of the compression chamber 104 by the pressure difference between the refrigerant gas in the gas passage pipe 125 on the low pressure side and the compression chamber 104. The discharge valve 112b is opened by the pressure difference of the refrigerant gas between the compression chamber 104 and the gas passage pipe 125 on the high pressure side so that the discharge valve 112b opens when the refrigerant gas pressure in the compression chamber 104 becomes equal to or higher than a predetermined pressure. This is a valve that allows gas to flow out in the direction of the gas flow pipe 125. The suction valve 112a and the discharge valve 112b are both valves that are biased by leaf springs.

With the above arrangement, in the conventional apparatus, the suction valve 1
After the refrigerant gas sucked from 12a is compressed to a high pressure in the compression chamber 104, it is supplied to the condenser 122 via the discharge valve 112b.

Then, the conventional linear compressor 121
In the case where the axis of the cylinder 103 is displaced from the axis of the piston 105, the piston 105 hits against the cylinder 103 and wear of a sliding portion or leakage of compressed gas deteriorates reliability and reduces sliding loss. The efficiency of the compressor may decrease due to the increase in the pressure.

For this reason, as shown in FIG. 6, a configuration has recently been proposed in which the piston 105 is connected to and supported by the shaft 113 so as to be able to move slightly in the radial direction perpendicular to the axial direction of the piston. Thus, even when the axis of the cylinder 103 and the axis of the shaft 113 are misaligned, it is possible to prevent the piston 105 from hitting the cylinder 103 in one direction.

[0010]

However, since the piston 105 and the shaft 113 are supported by the elastic member 110 such as a coil spring or a suspension spring, the shaft between the cylinder 103 and the shaft 113 during the reciprocating movement of the piston 105. In some cases, the centers became non-parallel and the shaft axis had some inclination with respect to the cylinder axis.

In such a case, the conventional structure cannot cope with the above problem. As shown in FIG.
Has hit the cylinder 103.

The present invention has been made in view of the above point, and even when the parallelism between the cylinder axis and the shaft axis is lost, the piston prevents the cylinder from coming into contact with the cylinder and slides. An object of the present invention is to provide a linear compressor that maintains the reliability of a moving part and prevents a decrease in device efficiency.

[0013]

SUMMARY OF THE INVENTION The present invention provides a cylinder provided in a housing, a piston reciprocally fitted in the cylinder and defining a compression chamber in the cylinder, and one end of which is formed by the piston. A linear motor that applies an alternating voltage of a predetermined frequency to reciprocately drive the piston and the shaft, wherein the linear compressor compresses gas in a compression chamber and supplies the gas to the outside. Is characterized by being supported so as to be movable in a radial direction perpendicular to the axial direction of the shaft, and to be swingable about a predetermined portion of the shaft.

By using this configuration, even when the shaft is shaken with respect to the cylinder and the parallelism between the cylinder axis and the shaft axis is lost, the shaft shake between the cylinder and the piston is prevented. This can be prevented from occurring.

[0015] More specifically, the shaft is integrally attached to a piston end of the shaft, and has a radial dimension that is a predetermined distance from a side wall of the recess formed at the shaft end of the piston. And a joint member provided with a convex portion for abutting the concave portion in a point contact state, and pressing and urging the joint member to bring the convex portion into contact with the concave portion And an elastic member that holds the piston so as to be able to swing around a contact point of the convex portion. Further, the projection has a hemispherical tip at the tip.

Also, first and second cylinders provided on both sides of the housing are fitted reciprocally in the first and second cylinders, and compression chambers are provided in the first and second cylinders, respectively. First and second pistons forming a partition, shafts having both ends connected to the first and second pistons, and an AC voltage having a predetermined frequency being applied to the first and second pistons.
A linear motor that reciprocates the piston and shaft,
In a linear compressor that compresses gas in a compression chamber and supplies the gas to the outside, the first and second pistons are respectively supported movably in a radial direction orthogonal to an axial direction of the shaft, and It is good also as a structure hold | maintained each swingably centering on the predetermined location of a shaft. By using this configuration, pistons are respectively connected to both sides of the shaft, and even in a two-piston type linear compressor in which shaft runout between the shaft and the cylinder is particularly problematic, occurrence of shaft runout between the cylinder and the piston is reliably prevented. be able to.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the linear compressor according to the present invention will be described below with reference to the drawings.

As shown in FIG. 5, the linear compressor of the present invention is used as a compressor of a closed type refrigeration system. As a linear compressor, as shown in FIG.
And holds the linear compressor as an enclosed space. The housing 1 has compression chambers 2 and 3 at its upper and lower parts.

A magnetic frame (yoke) 4 made of low carbon steel is formed at a lower portion of the housing 1.
A cylinder fitting hole 5 extending in the vertical direction is formed through the center portion of the first cylinder, and a bottomed cylindrical first cylinder 6 made of a metal material is fitted into the cylinder fitting hole 5.

A first piston 7 is slidably fitted in the first cylinder 6, and the first cylinder 6 and the first piston 7 define an upper compression chamber 2 serving as a compression space for refrigerant gas. Is done. The first cylinder 6 is provided with a first suction valve 8a connected to an external gas flow path pipe 125 for sucking the refrigerant gas vaporized by the evaporator 124.

On the other hand, a second cylinder 9 extending in the vertical direction is provided on the upper portion of the housing 1 on the side opposite to the first cylinder 6, and a second piston 10 is slidable in the second cylinder 9. And the second cylinder 9 and the second piston 10 define an upper compression chamber 3 serving as a compression space for the refrigerant gas. Similarly to the lower compression chamber 2, the second cylinder 9 is provided with a second suction valve 11a connected to an external gas passage pipe 125 for sucking the refrigerant gas vaporized by the evaporator 124. .

The first piston 7 and the second piston 10 are connected to both ends of a piston shaft 12, respectively. ) 13 are integrally fixed.

An annular recess 15 is formed in the yoke 4 concentrically with the cylinder fitting hole 5, and an annular permanent magnet 16 is provided on the inner side surface of the recess 15 between the yoke 4 and the yoke 4. The magnet 16 and the yoke 4 constitute a magnetic circuit of the linear motor 17, and the magnet circuit and the yoke 4
A magnetic field of a predetermined strength is generated in a gap between the outer side surface of the first and second surfaces. The bobbin 13 is disposed in a gap formed in a part of a magnetic circuit including the magnet 16 and the yoke 4, and an alternating current having a predetermined frequency is supplied to an electromagnetic coil 19 wound around the outer periphery of the bobbin 13 by a power supply device (not shown). 1), the first piston 7 and the second piston 10 are reciprocated in the first cylinder 6 and the second cylinder 9, respectively, to generate gas pressure of a predetermined cycle in the lower compression chamber 2 and the upper compression chamber 3. It is made to let. And
This power supply device supplies a predetermined drive current to the electromagnetic coil 19 based on a control command from a control means (not shown) for controlling the drive power.

As shown in FIG. 2, the first piston 7 is provided with a concave portion 7a having a U-shaped cross section having an opening on the side of the piston shaft 12 and a convex portion 21a in contact with the concave portion 7a. Member 2 provided in
1 is integrally attached to an end of the piston shaft 12 on the first piston side. Here, FIG. 2 is a cross-sectional view of a main part for describing the configuration of the first piston 7 and the joint member 21 in the apparatus of FIG. FIG. 3 is a cross-sectional view of a main part for describing the operation of the first piston 7 in the apparatus shown in FIG.

The projecting portion 21a of the joint member 21 has a hemispherical tip at the tip, and comes into contact with the recessed portion 7a in a point contact state. And, in the joint member 21,
A disc-shaped protrusion 21b having an outer diameter smaller than the inner diameter of the recess 7a is provided at the base end of the protrusion 21a, and a predetermined clearance is provided between the side wall of the recess 7a and the disc-shaped protrusion 21b. (In the present embodiment, about 50 to 100 μm).

The leaf spring 22 is pressed and urged so that the projection 21a of the joint member 21 always contacts the recess 7a of the first piston 7 in a point contact state. Since the leaf spring 22 only exerts a force in a direction of pressing the joint member 21 toward the first piston 7,
The first piston 7 is connected to the joint member 21 so as to be movable in the radial direction of the axis within the range of the clearance. When the axis of the piston shaft 12 is slightly displaced in parallel with respect to the first cylinder 6, the first piston 7 moves in the radial direction of the axis with respect to the joint member 21, and The axis of the piston 7 coincides with the axis of the first cylinder 6 (see FIG. 3A).

The distal end of the convex portion 21a of the joint member 21 has a hemispherical shape, and is brought into contact with the concave portion 7a of the first piston 7 in a point contact state by the leaf spring 22. If the axis and the axis of the first cylinder 6 lose parallelism and the axis of the piston shaft 12 is inclined with respect to the first cylinder 6, the first
The piston 7 rotates around the contact point with respect to the joint member 21 so that the axis of the first piston 7 is
(See FIG. 3 (b)).

As a result, the piston shaft 12 is
Even if shaft runout occurs with respect to cylinder 6, shaft runout between first cylinder 6 and first piston 7 is prevented from occurring,
The reliability of the sliding portion can be maintained without the first piston 7 colliding with the first cylinder 6, and a decrease in efficiency due to wear of the sliding portion can be prevented. In particular, when the first piston 7 and the second piston 10 are connected to both sides of the piston shaft 12 as in the present embodiment, the distance between the piston shaft 12 and the first cylinder 6 or the second cylinder 9 is increased. In this case, the shaft is easily shaken, and the effect can be particularly expected.

In the above description, only the connection between the first piston 7 and the piston shaft 12 has been described in detail.
Similarly to the first piston 7, the second piston 10
a is provided. Then, the protrusion 23 of the joint member 23 integrally attached to the piston shaft 12 is formed.
The second piston 10 is connected to the piston shaft 12 via the joint member 23 by being pressed and urged by the leaf spring 24 so that the a is always in contact with the concave portion 10a in a point contact state. Here, the configuration of the second piston 10 and the joint member 23 is the same as that of the first piston 7 and the joint member 2.
1, the detailed description is omitted.

The description of the above embodiment is for the purpose of explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. Also, the configuration of each part of the present invention is not limited to the above-described embodiment,
It goes without saying that various modifications are possible within the technical scope described in the claims.

For example, in the above embodiment, a two-piston configuration has been described, but the present invention is also applicable to a one-piston linear compressor.

[0032]

As described above, according to the present invention, even when the shaft is deflected with respect to the cylinder and the parallelism between the cylinder axis and the shaft axis is lost, the cylinder and the piston can be moved. Can be prevented from occurring.

Accordingly, the reliability of the sliding portion can be maintained without the piston coming into contact with the cylinder, and a decrease in efficiency due to wear of the sliding portion can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a linear compressor showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part for describing a configuration of a first piston 7 and a joint member 21 in the apparatus of FIG.

FIG. 3 is a cross-sectional view of a main part for describing an operation of a first piston 7 in the apparatus in FIG.

FIG. 4 is a sectional view of a conventional linear compressor.

FIG. 5 is a conceptual diagram showing a configuration of a closed type refrigeration system.

FIG. 6 is a cross-sectional view illustrating a connection portion between a conventional improved piston and a shaft.

7 is a cross-sectional view of a main part for describing an operation of a piston 105 in the device in FIG. 6.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Lower compression chamber 3 Upper compression chamber 6 1st cylinder 7 1st piston 7a, 10a recessed part 8 1st valve mechanism 9 2nd cylinder 10 2nd piston 11 2nd valve mechanism 12 piston shaft 13 movable body (bobbin) 19 Electromagnetic coils 21, 23 Joint members 22, 24 Leaf springs (elastic members) 21a, 23a Convex portions 21b, 23b Disc-shaped projecting portions

Claims (4)

    [Claims]
  1. A cylinder provided in a housing;
    A piston reciprocally fitted in the cylinder and defining a compression chamber in the cylinder, a shaft having one end connected to the piston, and an AC voltage of a predetermined frequency applied to reciprocate the piston and the shaft. A linear motor that drives, and that supplies gas to the outside by compressing the gas in a compression chamber, wherein the piston is supported movably in a radial direction orthogonal to an axial direction of the shaft, and A linear compressor characterized by being held so as to be swingable about a predetermined portion of a shaft.
  2. 2. The shaft is integrally attached to a piston-side end of the shaft such that its radial dimension has a predetermined gap with respect to a side wall of the recess formed at the shaft-side end of the piston. And a joint member provided with a convex portion for abutting the concave portion in a point contact state, and urging the joint member to contact the convex portion with the concave portion, The linear compressor according to claim 1, further comprising: an elastic member that holds the piston so as to be able to swing around a contact point of the protrusion.
  3. 3. The linear compressor according to claim 2, wherein a tip portion of said convex portion has a hemispherical shape.
  4. 4. A first and second cylinder provided on both sides in a housing, and reciprocally fitted in the first and second cylinders, and compression chambers in the first and second cylinders, respectively. First and second pistons forming a partition, shafts having both ends connected to the first and second pistons, and an AC voltage having a predetermined frequency applied to reciprocally drive the first and second pistons and the shafts. A linear motor comprising: a first motor and a second motor; wherein the first and second pistons are supported so as to be movable in a radial direction orthogonal to an axial direction of the shaft. And a linear compressor which is held so as to be swingable about a predetermined portion of the shaft.
JP37223899A 1999-12-28 1999-12-28 Linear compressor Pending JP2001182652A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP37223899A JP2001182652A (en) 1999-12-28 1999-12-28 Linear compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP37223899A JP2001182652A (en) 1999-12-28 1999-12-28 Linear compressor

Publications (1)

Publication Number Publication Date
JP2001182652A true JP2001182652A (en) 2001-07-06

Family

ID=18500102

Family Applications (1)

Application Number Title Priority Date Filing Date
JP37223899A Pending JP2001182652A (en) 1999-12-28 1999-12-28 Linear compressor

Country Status (1)

Country Link
JP (1) JP2001182652A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005195002A (en) * 2003-12-29 2005-07-21 Lg Electronics Inc Abrasion preventing device for reciprocating compressor
JP2008527271A (en) * 2005-01-12 2008-07-24 アエロラス ゲゼルシャフト ミット ベシュレンクテル ハフツング アエロスタティッシェ ラーガー−レーザーテヒニークAEROLAS GmbH, Aerostatische Lager−Lasertechnik Axial direction driven piston cylinder unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005195002A (en) * 2003-12-29 2005-07-21 Lg Electronics Inc Abrasion preventing device for reciprocating compressor
JP4690018B2 (en) * 2003-12-29 2011-06-01 エルジー エレクトロニクス インコーポレイティド Wear prevention device for reciprocating compressor
JP2008527271A (en) * 2005-01-12 2008-07-24 アエロラス ゲゼルシャフト ミット ベシュレンクテル ハフツング アエロスタティッシェ ラーガー−レーザーテヒニークAEROLAS GmbH, Aerostatische Lager−Lasertechnik Axial direction driven piston cylinder unit

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