KR101149674B1 - Linear motor for linear compressor - Google Patents

Abstract

According to the present invention, a plurality of laminations are laminated in a circumferential direction in a ring-shaped inner stator, and a plurality of laminations are laminated in a portion of the circumferential direction around a coil wound in a circumferential direction and positioned at a predetermined interval outside the inner stator. Core blocks are installed between the outer stator and the inner stator and the outer stator installed at regular intervals in the circumferential direction, and reciprocating linearly in the axial direction by mutual electromagnetic force with the outer stator and the inner stator as current flows in the coil. A linear motor of a linear compressor including a moving permanent magnet, wherein the outer stator includes a first core block and a second core block in which a plurality of first and second laminations are stacked in some section in a circumferential direction, respectively, The two core blocks can be connected to each other axially Core blocks 1, 2 are formed in the abutting portion with each other is configured to be carried by the assembly means for the assembly to be rotated together with the first and second core blocks in a circumferential direction.

Linear compressor, linear motor, inner stator, outer stator, core block, assembly protrusion

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 including a linear motor according to the prior art,

Figure 2 is a perspective view of the outer stator of the linear motor according to the prior art,

3 is a side cross-sectional view showing a part of a linear compressor including a linear motor according to the present invention;

4 is a perspective view showing an outer stator of the linear motor according to the present invention;

5 is an exploded perspective view illustrating an assembled state of the core block included in FIG. 4.

DESCRIPTION OF THE REFERENCE NUMERALS

52: cylinder 54: piston

56: intake valve 58a: discharge valve

58b: discharge cap 58c: discharge valve spring

60: linear motor 62: inner stator

64: outer stator 64a: coil winding body

64b, 64b ': 1st, 2nd core block 66: permanent magnet

72: connecting member 74a, 74b: first and second assembly protrusion                 

76: stopper

The present invention relates to a linear motor of a linear compressor for generating a linear reciprocating drive force by mutual electromagnetic force between an inner stator and an outer stator and a permanent magnet to reciprocate a piston in a cylinder. In particular, the outer stator includes a pair of core blocks. A linear motor of a linear compressor configured to be rotatably assembled with each other in the circumferential direction on the outer circumferential surface of the coil winding body and coupled to each other in the circumferential direction and the axial direction.

In general, a compressor is a mechanical device that increases pressure by receiving power from a power generator such as an electric motor or a turbine to compress air, refrigerant, or various other working gases. It is widely used throughout.

These compressors are classified into a reciprocating compressor which compresses the refrigerant while linearly reciprocating the inside of the cylinder by forming a compression space in which the working gas is absorbed and discharged between the piston and the cylinder. And a rotary compressor for compressing the refrigerant while the roller is eccentrically rotated along the inner wall of the cylinder to form a compression space in which the working gas is sucked and discharged between the eccentrically rotating roller and the cylinder. As a scroll compressor that compresses the refrigerant while the rotating scroll rotates along the fixed scroll to form a compression space in which the working gas is absorbed and discharged between the orbiting scroll and the fixed scroll. Divided.

Recently, among the reciprocating compressors, in particular, the piston is directly connected to the reciprocating linear motion drive motor, so that there is no mechanical loss due to the motion conversion to improve the compression efficiency as well as a simple linear compressor has been developed a lot.

Normally, a linear compressor is configured to suck and compress refrigerant and then discharge the refrigerant while the piston is moved reciprocally linearly in the cylinder by the linear motor inside the sealed shell, the linear motor being permanent between the inner and outer stators. The magnets are positioned so that the permanent magnets are linearly reciprocated by mutual electromagnetic forces. As the permanent magnets are driven in connection with the pistons, the pistons reciprocate linearly inside the cylinders to inhale and compress the refrigerant, and then discharge them. To do that.

1 is a side cross-sectional view showing a portion of a linear compressor including a linear motor according to the prior art, Figure 2 is a perspective view showing the outer stator of the linear motor according to the prior art.

The linear motor of the linear compressor according to the prior art drives the piston 4 to reciprocally linearly move inside the cylinder 2 as shown in FIG. 1, but a plurality of laminations are fixed to the outer peripheral surface of the cylinder 2. A cylindrical inner stator 12 stacked in the circumferential direction and a pair of core blocks 14b and 14b 'are assembled to the coil winding body 14a at a predetermined interval outside the inner stator 12. It consists of an outer stator 14 and a permanent magnet 16 axially movable between the inner stator 12 and the outer stator 14 so as to be connected by the piston 4 and the connecting member 22. .

Of course, a compression space (P) is formed between the piston (4) and the inside of the cylinder (2), and the refrigerant is sucked into the compression space (P) as the piston (4) reciprocating linear movement is compressed Next, it is discharged, the suction hole (4h) and the suction valve (6) that can be opened and closed to the end of the cylinder (2) is installed in one end of the piston (4), the refrigerant can flow into the compression space (P) The discharge valve (8a) is elastically supported by the discharge valve spring (8c) of the spiral to the discharge cap (8b) fixed to one end of the cylinder (2) so that the compressed refrigerant can be discharged is installed to be opened and closed.

In particular, the outer stator 14 includes a coil winding 14a having a coil wound circumferentially as shown in FIG. 2, and the coil winding 14a so as to surround an outer side of the coil winding 14a. The first and second core blocks 14b and 14b 'are positioned at regular intervals in the circumferential direction, and the first and second core blocks 14b and 14b' are edge portions of the coil winding 14a. A plurality of laminations bent so as to wrap the structure is configured to be stacked only in some section in the circumferential direction.

At this time, the coil winding 14a and the first and second core blocks 14b and 14b 'are fixed by separate jigs, and the first and second core blocks 14b and 14b' are fixed to each other. Injection molded so as to be respectively assembled at both ends of the coil winding 14a in the axial direction, and the first and second core blocks 14b and 14b 'may be coupled to each other as well as to be coupled to the coil winding 14a. The injection fixing part 24 which is injection molded of a plastic material is formed on the outer circumferential surfaces of the coil winding body and the first and second core blocks 14b and 14b '.

However, the linear motor of the linear compressor according to the prior art has a coil winding body for assembling / fixing the first and second core blocks 14b and 14b 'to the coil winding body 14a in the process of manufacturing the outer stator 14. An injection fixing part 24, which is injection molded from a plastic material, is formed on the outer circumferential surfaces of the 14a and the first and second core blocks 14b and 14b ', and the coil winding 14a is formed by the injection fixing part 24. Since the first and second core blocks 14b and 14b 'are fixed to each other, the warp is generated or deformed as a long time passes under an environment such as a temperature change due to the characteristics of the injection molding, and thus the dimension of the outer stator 14 is changed. There is a problem.

In addition, the mutual electromagnetic force generated by acting together with the inner stator 12 and the permanent magnet 16 due to the deformation of the outer stator 14 as described above is associated with various components initially included in the linear motor 10. Since it is different from the electromagnetic force designed in consideration of matters, various noise and vibration problems may occur, thereby reducing the reliability of the product.

In order to solve the above problems, the first and second core blocks 14b and 14b 'constituting the outer stator 14 may be connected to each other by welding. Thus, the first and second core blocks 14b and 14b' are connected to each other. Is assembled to the coil winding 14a, and then the first and second core blocks 14b and 14b 'are connected by welding, the welding process is further added to increase the manufacturing process and accordingly increase the manufacturing time. There is a problem of low production efficiency.

The present invention has been made to solve the above problems of the prior art, to provide a linear motor of the linear compressor to be fixed to each other while assembling the first and second core blocks to the coil winding in the outer stator manufacturing process. There is this.

The linear motor of the linear compressor according to the present invention for solving the above problems is a ring-shaped inner stator in which a plurality of laminations are stacked in the circumferential direction, and coils wound in the circumferential direction by being positioned at predetermined intervals outside the inner stator. Core blocks in which a plurality of laminations are circumferentially stacked in only a portion of the circumferential direction are installed between the outer stator and the inner stator and the outer stator provided at regular intervals in the circumferential direction, so that the outer current flows through the coil. In a linear motor of a linear compressor comprising a stator and an inner stator and a permanent magnet reciprocating linearly in an axial direction by mutual electromagnetic force, the outer stator includes a plurality of first and second laminations each laminated in a portion in a circumferential direction. First and second core blocks And means for assembling the first and second core blocks to be rotatably assembled with each other in the circumferential direction so that the first and second core blocks are formed in contact with each other so that the first and second core blocks can be connected to each other in the axial direction. It is configured to.

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

3 is a side cross-sectional view showing a part of a linear compressor including a linear motor according to the present invention, Figure 4 is a perspective view showing an outer stator of the linear motor according to the present invention, Figure 5 is a core included in Figure 4 An exploded perspective view showing the assembled state of the block.

The linear motor of the linear compressor according to the present invention includes an inner stator 62, an outer stator 64, and a permanent magnet 66, as shown in FIG. 3, and the permanent magnet 66 is axially oriented by mutual electromagnetic force. The outer stator 64 is operated to linearly reciprocate, and the outer stator 64 is assembled such that the first and second core blocks 64b and 64b 'abut against each other to surround the outer circumferential surface at regular intervals in the circumferential direction of the coil winding 64a. And assembling protrusions 74 are formed at portions of the first and second core blocks 64b and 64b 'that are in contact with each other so that the first and second core blocks 64b and 64b' are assembled in the circumferential direction. At the same time, the first and second core blocks 64b and 64b 'are fixed to each other in the axial direction.

Of course, the linear motor 60 is installed to be connected to the piston 54 having one end inserted into the cylinder 52, and the piston 54 is the cylinder 52 as the linear motor 60 is driven. The refrigerant is sucked into the suction space formed between the cylinder 52 and the piston 54 while being reciprocated linearly therein, and then compressed and discharged, but one end of the piston 54 allows the refrigerant to be sucked in. At the same time as 54h is formed, a thin suction valve 56 is installed in the suction hole 54 so as to be opened and closed, and a discharge valve 58a is provided to discharge the compressed refrigerant to one end of the cylinder 52. The cylinder 52 is elastically supported by the spiral discharge valve spring 58c inside the discharge cap 58b fixed to one end thereof, and is installed to be opened and closed.

Here, the inner stator 62 is formed in a cylindrical shape by laminating the rectangular laminations in the circumferential direction, the ring is fitted at both ends in the axial direction to be connected to each other in the circumferential direction, and fitted to the outer peripheral surface of the cylinder 52 In this state, a separate fixing member (not shown) is inserted and fixed between the outer circumferential surface of the cylinder 52 and the inner circumferential surface of the inner stator 62.

Next, the outer stator 64 is positioned at an outer side of the inner stator 62 at predetermined intervals so that both ends thereof are fixed to the cylinder 52 by various frames and covers, and the inner stator 62 is disposed. The permanent magnet 66 is installed between the outer stator and the outer stator 64, and the permanent magnet 66 is installed such that one end thereof is connected to the other end of the piston 54 by the connection member 72.

Especially. As shown in FIGS. 4 and 5, the outer stator 64 has the first and second core blocks 64b and 64b 'disposed at predetermined intervals in the circumferential direction of the coil winding 64a. While being assembled in the circumferential direction to surround the outer circumferential surface of (64a) is installed to be coupled to each other by the assembling protrusions 74, the coil winding (64a) is wound so that the coil through which current can flow several times in the circumferential direction The first and second core blocks 64b and 64b 'include laminations that are bent at right angles so as to surround the edge portions of both ends of the coil winding 64a in the axial direction. The assembling protrusions 74 are integrally projected and bent at the end of each lamination in the same plane as the respective laminations so that the assembling protrusions 74 are positioned at the portions in contact with each other in the first and second core blocks 64b and 64b '. Article 1,2 Lip protrusions 74a and 74b.

Of course, in the laminations constituting the first and second core blocks 64b and 64b ', groove-shaped macs (Mac: M) are all formed at a predetermined position on the surface thereof so that the laminations are easily stacked in the circumferential direction. To be fixed.

In this case, it is preferable that the first and second core blocks 64b and 64b 'are formed in the same size and shape so that an inner circumferential surface may be closely assembled to an outer circumferential surface of the coil winding 64a. The two assembling protrusions 74a and 74b protrude to portions where the first and second core blocks 64b and 64b 'come into contact with each other, and the ends thereof are bent at 90 ° in a direction facing each other. Various configurations can be made to match.

In addition, as the first and second core blocks 64b and 64b 'are assembled in the circumferential direction, the first and second assembly protrusions 74a and 74b are engaged with each other and fixed in the axial direction. In order to prevent the first and second core blocks 64b and 64b 'from being rotated in the circumferential direction while the two assembly protrusions 74a and 74b are completely engaged, the first and second core blocks 64b and 64b' It is preferable that the stopper 76 is formed in at least one or more laminations located at the circumferential end of the.

At this time, the stopper 76 protrudes in the axial direction longer than the first and second assembly protrusions 74a and 74b at the ends of the laminations so as to support both the first and second assembly protrusions 74a and 74b. The stopper is formed at the circumferential end of the first and second core blocks 64b and 64b 'so as to support the force acting in the circumferential direction when the first and second core blocks 64b and 64b' are assembled. More preferably, laminations formed with 76 are assembled so that two to three more overlap each other.

Therefore, looking at the assembly process of the outer stator 64 configured as described above, both sides so as to surround the outer peripheral surface of the coil winding 64a such that the first and second core blocks 64b and 64b 'are deviated from each other in the axial direction. The first and second assembly protrusions 74a and 74b are engaged with each other as the first core block 64b is assembled in the circumferential direction on the side of the second core block 64b '. When the first and second assembling protrusions 74a and 74b are completely assembled, the first assembling protrusion 74a is caught by the stopper 76 so that the first core block 64b is no longer moved. The first and second core blocks 64b and 64b 'are assembled to surround the outer circumferential surface of the coil winding 64a.

At this time, the inner circumferential surface of the first and second core blocks 64b and 64b 'is fixed in the circumferential direction as the inner circumferential surface of the coil winding body 64a comes into close contact with the outer circumferential surface, and the first and second assembly protrusions 74a and 74b are fixed. The first and second core blocks 64b and 64b 'are structurally assembled to the coil winding 64a and fixed at the same time because the first and second core blocks 64b and 64b' are fixed in the axial direction.

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.

In the linear motor of the linear compressor according to the present invention configured as described above, the first and second core blocks are assembled to the coil winding body in the process of manufacturing the outer stator, and the first and second core blocks are respectively formed at the portions in contact with each other. Since the first and second core blocks are assembled to the coil winding body at the same time as the first and second core blocks are assembled to be engaged with each other and are fixed to each other in the circumferential direction and the axial direction, there is no need for a separate fixing process. In addition, the production cost and manufacturing time can be reduced to increase the production efficiency.

Claims (4)

A ring-shaped inner stator in which a plurality of laminations are laminated in the circumferential direction, An outer stator placed at a predetermined interval outside the inner stator and having a plurality of laminations stacked around a coil wound in a circumferential direction in a predetermined interval in a circumferential direction with a plurality of laminations; In the linear motor of the linear compressor comprising a permanent magnet installed between the inner stator and the outer stator and reciprocating linear movement in the axial direction by mutual electromagnetic force with the outer stator and the inner stator as a current flows in the coil. , The outer stator may include: first and second core blocks in which a plurality of first and second laminations are stacked in a partial section in the circumferential direction, and the first and second cores so that the first and second core blocks can be connected to each other in an axial direction. Blocks are formed in contact with each other further comprises a means for assembling the first and second core blocks to be assembled in the axial direction so as to be assembled to rotate in the circumferential direction with each other, The assembling means is formed in a portion where the first and second core blocks abut each other and is protruded and bent in a direction opposite to each other so as to be joined to each other, and the circumferential direction of the first and second core blocks. And a stopper protruding in the direction of the core block abutting at least one of the first and second lamination ends positioned at the end to prevent the first and second core blocks from being interlocked with each other during assembly. Linear motor of the compressor. delete delete The method of claim 1, The stopper is a linear motor of the linear compressor, characterized in that protruding in the axial direction so as to support both the first and second assembly projections.

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