KR20070075905A - Linear motor for linear compressor - Google Patents

Abstract

A linear motor for a linear compressor is provided to be assembled more firmly by inserting fixing protrusions formed on an outer circumferential surface of a cylinder into fixing grooves of an inner stator, and to reduce manufacturing costs by needing no additional components. A linear motor for a linear compressor comprises an inner stator(62), an outer stator(64) and a permanent magnet(66). The inner stator includes integrally fixed lamination laminated in circumference direction on an outer circumferential surface. The outer stator is installed to be spaced by predetermined distance on an outer circumference of the inner stator. The permanent magnet maintains a gap between the inner stator and the outer stator, connected to a piston(52) and reciprocates the piston by mutual electromagnetic force.

Description

Linear motors for linear compressors {LINEAR MOTOR FOR LINEAR COMPRESSOR}

1 is a side cross-sectional view showing a portion of a linear compressor according to the prior art,

2 is a side sectional view showing a part of the linear compressor according to the present invention;

3 is a side cross-sectional view showing the inner stator fixing structure of the linear compressor according to the present invention;

4 is an exploded perspective view showing a part of the inner stator which is the main part of the present invention.

<Explanation of symbols on main parts of the drawings>

52: cylinder 52a: support end

52b: fixing protrusion 54: piston

56: suction valve 58: discharge valve assembly

60: linear motor 62: inner stator

62h: fixing groove 64: outer stator

66: permanent magnet 68: motor cover

The present invention relates to a linear compressor including a cylinder, a piston, and a linear motor for driving the same, which sucks and compresses a refrigerant into a compression space formed between the cylinder and the piston as the piston is driven. It relates to a linear motor of a linear compressor that can be more firmly assembled to the outer cylinder outer peripheral surface.

1 is a side cross-sectional view of a portion of a linear compressor according to the prior art.

In the conventional linear compressor, as shown in FIG. 1, a compression space P into which one end of the piston 4 is inserted is formed in the cylinder 2, and the inner stator 12, the outer stator 14, and the permanent magnet ( The linear motor 10 made of 16) reciprocates linearly the piston 4 by mutual electromagnetic force, thereby allowing the refrigerant to be sucked into the compression space P, compressed, and then discharged.

Of course, the structure consisting of the cylinder 2, the piston 4 and the linear motor 10 is installed to be elastically supported by a buffer spring (not shown) inside the shell (not shown) which is a closed space, the piston (4) The suction cap 6 is installed in the suction hole 4h formed to communicate with the compression space P at one end thereof, and the discharge valve 8a is opened and closed at one end of the cylinder 2. The discharge valve assembly 8 is elastically supported by the discharge valve spring (8c) is installed to adjust the intake / discharge of the refrigerant in accordance with the pressure in the compression space (P).

Here, the cylinder 2 is installed so that one end is fixed to the main frame 3, the inner stator 12 is installed to be fixed to the outer peripheral surface of the cylinder 2, while the outer stator 14 is the The outer circumferential surface of the inner stator 12 is installed to be bolted to each other in the axial direction between the main frame 3 and the motor cover 18 so as to be positioned at regular intervals in the radial direction.

At this time, the inner stator 12 is a plurality of laminations are laminated in the circumferential direction, the O-ring (O) is inserted into the grooves 12H formed in each of the axial front and rear ends are formed in a cylindrical shape, one end of the main body frame At the same time as being supported by (3), the other end is supported by a sort of 'C' shaped fixing ring (C) press-fitted into the ring-shaped fixing groove (2h) formed on the outer peripheral surface of the cylinder (2) to be fixed in the axial direction do.

In addition, the permanent magnet 16 is installed to be fixed to the connecting member connected to the other end of the piston 4 with a predetermined gap in the radial direction with the inner stator 12 and the outer stator 14.

At this time, a supporter (not shown) connected to the other end of the piston 4 is connected to a plurality of springs (not shown) between the motor cover 18 and a main body cover (not shown) provided at a predetermined interval in the movement direction thereof. It is installed so as to be elastically supported in the movement direction.

Thus, the cylinder 2, the inner stator 12, the outer stator 14, the main frame 3, the motor cover 18, the main cover is fixed, the piston 4, the permanent magnet 16, The supporter reciprocates linearly, and as a result, the refrigerant is sucked into the compression space P, compressed, and discharged as the pressure inside the compression space P varies.

However, the linear motor of the linear compressor according to the prior art presses the inner circumferential end of the inner stator 12 into contact with the outer circumferential surface of the cylinder 2 made of cast iron, while the axial end of the inner stator 12 is made of aluminum. The inner stator 12 is supported so as to be supported by the main body frame 3 manufactured at the same time and the other end in the axial direction of the inner stator 12 is supported by the fixing ring C fixed to the outer circumferential surface of the cylinder 2. The manufacturing process is complicated as the machining tolerance and the assembly tolerance of the inner diameter of the cylinder and the outer diameter of the cylinder 2 are precisely set, and further, the fixing ring C is fixed to the inner stator 12 to fix the inner stator 12. The press-fit into the outer circumferential surface fixing groove (2h) has a problem that not only the assembly process is complicated, but also parts are added to increase the production cost.

The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide a linear motor of a linear compressor that can be more firmly fixed to the outer peripheral surface of the cylinder during the cylinder manufacturing.

In the linear motor of the linear compressor according to the present invention for solving the above problems, one end of a piston is inserted into a cylinder to form a compression space, and the linear motor is driven in the axial direction to suck refrigerant into the compression space. A linear motor of a linear compressor used for a linear compressor to be compressed and then discharged, comprising: an inner stator in which a lamination laminated in the circumferential direction on the outer peripheral surface of the cylinder is integrally fixed in the axial direction when the cylinder is manufactured, and the inner stator An outer stator provided at a predetermined interval on the outer circumference and a permanent magnet connected to the piston while maintaining a gap between the inner stator and the outer stator are reciprocally driven by mutual electromagnetic force.

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

Figure 2 is a side cross-sectional view showing a part of the linear compressor according to the present invention, Figure 3 is a side cross-sectional view showing the inner stator fixing structure of the linear compressor according to the present invention, Figure 4 is a main part of the inner stator of the present invention An exploded perspective view of a portion shown.

In the linear compressor according to the present invention, as shown in FIG. 2, a structure including a cylinder 52, a piston 54, and a linear motor 60 is installed inside a shell (not shown), which is a closed space. 60 consists of an inner stator 62, an outer stator 64 and a permanent magnet 66, and the inner stator 62 is installed to be integrally fixed to its outer circumferential surface when the cylinder 52 is manufactured.

Here, the cylinder 52 has a cylindrical shape, one end of which extends in a radial direction to form a body frame 52 ', and one end and the outer stator 64 of the inner stator 62 on the body frame 52'. One end of the) is installed so as to be elastically supported in the axial direction, respectively.

At this time, the cylinder 52 is die-casting made of aluminum in order to reduce the mass, it can be produced in various shapes according to the shape of the mold.

Next, one end of the piston 54 is inserted into the cylinder 52 to form a compression space P therebetween, and the other end is driven to reciprocate linearly by being connected to the permanent magnet 66.

At this time, the piston (54) is formed so that the suction hole (54h) is formed in communication with the compression space (P) is formed in one end blocked in a cylindrical shape, the thin suction valve 56 to block the suction hole (54h) Is installed to open and close to adjust the suction of the refrigerant in accordance with the pressure inside the compression space (P).

In addition, the cylinder 52 has a discharge valve assembly in which the discharge valve 58a is elastically supported in the axial direction by the discharge valve spring 58c inside the discharge cap 58b so as to prevent one end contacting the compression space P. 58 is mounted to control the discharge of the compressed refrigerant according to the pressure inside the compression space P. FIG.

Next, the linear motor 60 has a cylindrical inner stator 62 configured to stack a plurality of laminations in a circumferential direction, and a plurality of laminations are circumferentially spaced in a circumferential direction on a coil wound body wound around the circumferential direction. The cylindrical outer stator 64 is provided with a pair of stacked core blocks and a permanent magnet 66 positioned between the inner stator 62 and the outer stator 64 and reciprocating linearly by mutual electromagnetic force.

At this time, the inner stator 62 is installed so that one end is supported by the main frame 52 'and the other end is supported by the support end 52a of the cylinder, and the outer stator 64 is the inner stator. The other end is positioned at a predetermined interval on the outer circumferential surface of the 62 so as to be supported by the motor cover 68 while the other end is supported by the main body frame 52 ', and the permanent magnet 66 is It is located between the inner stator 62 and the outer stator 64 so as to be movable in the axial direction while maintaining a predetermined gap so as to be connected to the other end of the piston 54 by a connecting member.

Of course, the permanent magnet 66 is installed so as to maintain a predetermined gap between the inner stator 62 and the outer stator 64 by design, and thus the permanent magnet 66 and the outer stator 64 are mutually compatible with each other. It generates an electromagnetic force and reciprocates linearly.

More specifically, the fixing structure of the inner stator 62 will be described with reference to FIGS. 3 and 4, wherein the inner stator 62 has a lamination 62A having a fixing groove 62h formed at an inner circumferential end thereof in a circumferential direction. The lamination 62B is laminated so as to be stacked over some sections and the lamination 62B in which the fixing groove 62h is not formed at the inner circumferential end is laminated over the other circumferential direction. Such an inner stator 62 is formed by the cylinder 52. Insert molding during die casting production of the inner stator 62 is supported by the body frame 52 ′ radially extended from one end of the cylinder 52, and from the other end of the cylinder 52. It is supported by the radially extending support end 52a.

At this time, the inner stator 62 may have the fixing groove 62h formed only in a portion of the inner circumferential surface thereof, and the fixing groove 62h may be formed in a ring shape on the entire inner circumferential surface thereof, and the front and rear ends thereof. O-rings (O) are inserted into the grooves (62H) formed in the grooves to assemble each lamination (62A, 62B) in a cylindrical shape.

Of course, the inner stator 62 is inserted into the mold at the time of die casting of the cylinder 52 and is integrally inserted into the outer circumferential surface of the cylinder 52 so that the inner stator is fixed to the outer circumferential surface of the cylinder 52. Since the fixing projection 52b engaging with the groove 62h is formed, the inner stator 62 is more firmly assembled and fixed to the outer peripheral surface of the cylinder 52.

 Therefore, when the fixing projection 52b of the cylinder and the fixing groove 62h of the inner stator are formed over the entire period in the circumferential direction, the inner stator 62 is only in the axial direction on the outer peripheral surface of the cylinder 52. When the fixing projection 52b of the cylinder and the fixing groove 62h of the inner stator are formed only in a partial section in the circumferential direction, the inner stator 62 is formed on the outer circumferential surface of the cylinder 52. The binding force is also applied in the direction and the circumferential direction so as to be more firmly assembled.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

The linear motor of the linear compressor according to the present invention configured as described above inserts an inner stator formed at a portion in the circumferential direction at an inner circumferential end thereof so as to engage an outer circumferential surface of the cylinder during die casting of the cylinder. As a result, the axial front and rear ends of the inner stator are axially supported by the main frame and the supporting end of the cylinder in the radial direction, and at the same time, the fixing groove of the inner stator is integrally assembled to engage the fixing projection formed on the outer circumferential surface of the cylinder. Because it is binding in the axial and / or circumferential direction, not only the assembly is more robust but also the production process and assembly process are simplified, the productivity is improved, and the additional assembly parts are not added to reduce the production cost. There is an advantage to this.

Claims (4)

One end of the piston is inserted into the cylinder to form a compression space, and the linear compressor of the linear compressor used for the linear compressor for sucking and compressing a refrigerant into the compression space by driving the piston in the axial direction, and then discharging the piston. In the motor, An inner stator, in which a lamination laminated in the circumferential direction is integrally fixed in the axial direction when the cylinder is manufactured; An outer stator provided at an outer circumference of the inner stator at predetermined intervals, And a permanent magnet connected to the piston while reciprocatingly driving the piston by mutual electromagnetic forces while maintaining a gap between the inner and outer stators. The method of claim 1, The inner stator may be insert molded to the cylinder outer circumferential surface such that the axial front and rear ends thereof are axially supported by a main frame and a support end radially extended to the outer circumferential surface of the cylinder during manufacture of the cylinder die casting. Linear motor of the compressor. The method according to claim 1 or 2, The inner stator includes a lamination in which at least one fixing groove is formed at an inner circumferential end thereof, The cylinder is a linear motor of the linear compressor, characterized in that the fixing projection is inserted into the fixing groove of the inner stator is formed on the outer peripheral surface of the die casting. The method of claim 3, wherein The inner stator is a linear motor of the linear compressor, characterized in that the lamination is formed in the circumferential direction lamination formed in the fixing groove only in a section.

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