KR100444952B1 - Linear compressor and manufacture method of stator for linear compressor - Google Patents

Abstract

According to the method for manufacturing a linear compressor and a stator for a linear compressor according to the present invention, a plurality of steel sheets 23a made of thin plates, and assembled with the steel sheets 23a, are bent in a ring shape, and the steel sheets 23a are centrifugally moved. The inner stator 23 disposed on the outer circumference of the cylinder 32 is manufactured by using the fixing rings 23d and 23f to be arranged.

As a result, the arrangement of the steel sheets 23a is more easily performed, thereby improving the overall assembly workability of the inner stator 23, as well as reducing the manufacturing cost.

Description

Linear compressor and manufacture method of stator for linear compressor

The present invention relates to a linear compressor and a method for manufacturing a stator for a linear compressor, and more particularly, a linear compressor having an inner stator in which a plurality of steel plates are arranged in a centrifugal direction on the outside of a cylinder to linearly reciprocate a piston. And a method for manufacturing a stator for a linear compressor.

In general, a refrigerator is a device that sucks and discharges a refrigerant from a product to which a refrigeration cycle such as an air conditioner is applied, and includes a reciprocating compressor, a rotary compressor, and a linear compressor. Among these compressors, the linear compressor has a driving device composed of a linear motor, and has a relatively high efficiency due to less energy loss in the driving device. 1 shows a conventional linear compressor.

Referring to FIG. 1, a conventional linear compressor includes a linear motor 2 installed in an airtight container 1 to generate power, and a compression device 3 that suctions and compresses refrigerant by receiving power from the linear motor 2. Equipped with.

The compression device 3 includes a cylinder block 3a provided with a cylinder 3b in an axial direction therein, a cylinder head 3c coupled to a lower portion of the cylinder block 3a to guide suction and discharge of refrigerant, and a linear member. A piston 3d linearly reciprocates in the cylinder 3b by the drive of the motor 2.

The linear motor 2 includes a cylindrical inner stator 4 fitted to the outer side of the cylinder 3b, a cylindrical outer stator 5 disposed to surround the inner stator 4 spaced apart from the outer stator 5, and the outer side thereof. A magnet 6 is provided between the stator 5 and the inner stator 4 to enable vertical movement.

The outer stator 5 has a plurality of steel sheets 5a radially stacked to form a tubular shape, and a coil 5b is wound therein to form a magnetic field when power is applied. The lower part of the outer stator 5 is seated on the first frame 3e extending outward from the lower end of the cylinder block 3a, and the upper part of the outer stator 5 is bolted to the first frame 3e. It is fixed through the second frame 3f. The magnet 6 reciprocates up and down between the inner and outer stators 4 and 5, which is connected to a piston 3d which is a movable body. This causes the piston 3d to reciprocate linearly in the cylinder 3b together with the magnet 6. Reference numeral 7 denotes a resonant spring for doubling the reciprocating force of the piston 3d.

In addition, the inner stator 4 also has a plurality of steel sheets 4b are erected in a centrifugal direction about the cylindrical holder 4a. That is, the steel plates 4b of a predetermined size are punched out through a jig device (not shown), and the steel plates 4b are placed on the outer periphery of the holder 4a. Then, one side of the electric plate 4b is assembled by fitting into the uneven portion formed in the holder 4a, and then the other side of the steel sheets 4b are joined by welding means, and the steel plates 4b are centrifugal in the outer periphery of the holder 4a. It is arranged to form the inner stator (4).

However, in the structure of the inner stator 4 of the conventional linear compressor, as described above, the steel sheets 4b should be radially erected and temporarily assembled to the holder 4a, and then joined by welding means. There is a problem that the assembly process is complicated and the manufacturing cost also increases.

In addition, since the steel sheets 4b are directly welded through the welding means, there is a fear that eddy current loss occurs accordingly.

The present invention is to solve this problem;

An object of the present invention is to provide a linear compressor that can improve the assembly workability and reduce the overall manufacturing cost by improving the structure of the inner stator made of steel plates are arranged in the centrifugal direction,

In addition, to provide a method for manufacturing a stator for a linear compressor that can facilitate the production of such a stator.

1 is a cross-sectional view showing a conventional linear compressor.

2 is a cross-sectional view showing the internal structure of the linear compressor according to the present invention.

Figure 3 shows an extract of the medial stator according to the present invention.

Figure 4 is a block diagram schematically showing a manufacturing step of the inner stator according to the present invention.

5 to 8 shows the assembled state of the steel plate and the fixing ring in each step in the process of manufacturing the inner stator.

* Description of symbols on the main parts of the drawings *

10. Airtight container 20. Linear motor

21. Magnet 22. External stator

23. Inner stator 23a.

23b, 23c .. locking projection 23d, 23f .. retaining ring

23e, 23g .. Jam groove 32 .. Cylinder

34.Piston

Linear compressor according to the present invention for achieving this object;

In the linear compressor having a magnet disposed on the outer periphery of the cylinder in which the piston is built, and a stator disposed on the outer periphery of the cylinder so as to be located inside the magnet,

The stator is characterized in that it comprises a locking ring is formed at the end and a plurality of steel plates arranged in the centrifugal direction, the locking groove is formed to be coupled to the locking projection to maintain the arrangement state of the steel sheets.

In addition, the manufacturing method of the stator for a linear compressor according to the present invention;

In the manufacturing method of the stator for linear compressor disposed on the outer periphery of the cylinder,

A parallel arrangement step of arranging a plurality of steel plates in parallel with protrusions formed at both ends;

An inserting step of inserting fixing rings formed in the lengthwise direction of the locking grooves at both ends of the steel plates arranged in parallel so that the locking projections are inserted after the parallel arrangement step;

A bending step of bending the fixing ring in a ring shape so that the steel plates are arranged in the centrifugal direction after the insertion step;

And a joining step of joining both ends of the fixed ring to maintain the fixed ring bent after the bending step.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the linear compressor according to the present invention includes a compression device 30 for sucking and compressing and discharging refrigerant having evaporated in a refrigeration cycle consisting of a closed circuit and an external device for driving the compression device 30. A linear motor 20 for generating power by receiving power from the power source and a sealed container 10 in which the linear motor 20 and the compression device 30 are incorporated are provided.

Compressor 30 is disposed in the lower space of the sealed container 10, the cylinder block 31 is provided with a cylinder 32 in the longitudinal direction at the center portion, and mounted on the lower portion of the cylinder block 31 to the refrigerant And a cylinder head 33 for guiding suction and discharge. The cylinder 31 is provided with a piston 34 that linearly reciprocates by the linear motor 20. The cylinder head 33 is provided with a suction chamber 33a for guiding the refrigerant to be sucked into the cylinder 32 and a discharge chamber 33b for discharging the refrigerant compressed in the cylinder 32. In addition, between the cylinder head 33 and the cylinder block 31, the suction plate 35a and the discharge plate 35b are drilled, and the suction hole 35a in accordance with the reciprocating motion of the piston 34. And a suction valve 36 and a discharge valve 37 for opening and closing the discharge hole 35b. Therefore, when the piston 34 is raised, the suction valve 36 is opened, and the refrigerant in the suction chamber 33a is sucked into the cylinder 32 through the suction hole 35a, whereas when the piston 34 is lowered, the discharge valve ( 37 is opened so that the refrigerant in the cylinder 32 is compressed and discharged to the discharge chamber 33b through the discharge hole 35b.

The linear motor 20 is disposed outside the cylinder 32 and has a magnet 21 for moving the piston 34, an outer stator 22 provided to surround the outside of the magnet 21, and the outer side thereof. The inner stator 23 is disposed on the outer circumference of the cylinder 32 so as to maintain a predetermined distance from the stator 22.

The magnet 21 is installed to enable the up and down reciprocating movement between the outer stator 22 and the inner stator 23, the upper end is connected to the piston 34 through the normal mover 21a, so that the piston 34 Will be activated. In addition, the upper portion of the piston 34 is provided with a leaf spring type resonant spring 24 that resonates in the vertical direction, thereby doubling the reciprocating force of the piston 34.

In addition, the outer stator 22 is disposed to form a predetermined gap with the inner stator 23 to surround the outside of the magnet 21, which is a plurality of steel sheets 22a stacked in a radial direction and the steel sheet 22a. A coil 22b wound circumferentially in the field is included to form a magnetic field during power supply. In order to fix the outer stator 22, the fixing frame 31b is fastened to the frame portion 31a extending outward from the lower portion of the cylinder block 31 through bolts. That is, when the outer stator 22 is disposed between the frame portion 31a and the fixed frame 31b, and the bolt is fastened, the outer stator 22 is firmly fixed to the upper portion of the cylinder block 31.

In addition, the inner stator 23 is disposed concentrically with them on the outer periphery of the cylinder 32 so that the magnetic field formed in the outer stator 22 and the magnet 21 can interact, the detailed structure thereof is as follows.

First, referring to FIG. 3, the inner stator 23 according to the present invention has a cylindrical shape so as to be fitted to the outer circumference of the cylinder 32, which is composed of a plurality of steel sheets 23a made of a metal sheet and the steel sheet ( After the engagement with the 23a, it is bent in a ring shape and provided with fixing rings 23d and 23f for holding the steel sheets 23a in the centrifugal direction.

The steel plate 23a is formed in a rectangular shape extending up and down, and the locking projections 23b and 23c are provided in the upper and lower portions of the steel plate 23a in a corresponding shape, respectively. At this time, the locking projections 23b and 23c are the first locking projections 23b formed to protrude above the respective steel plates 23a, and the second locking projections 23c provided to protrude below the respective steel plates 23a. It is distinguished by.

In addition, the fixing rings 23d and 23f are preferably made of a metal material capable of plastic deformation, and the locking protrusions 23e and 23c of the steel plate 23a are fitted in the lengthwise direction so that the locking protrusions 23b and 23c of the steel plate 23a are fitted. 23g) is formed. The fixing rings 23d and 23f include the first fixing ring 23d coupled to the first locking protrusion 23b that is the upper side of the steel plates 23a, and the second locking protrusion 23c that is the lower side of the steel plate 23a. The second fixing ring (23f) is coupled to the, which is a predetermined length extending in a straight line in the initial state or after being combined with the steel sheets (23a) and bent in a ring shape to join both ends, the inner stator of the cylindrical shape (23) At this time, the inner diameter (D) of the inner stator 23 is preferably configured to be the same as the outer diameter of the cylinder 32, which is to assemble the inner stator 23 directly to the outer periphery of the cylinder (32).

Next, a method of manufacturing the inner stator for the linear compressor will be described in detail with reference to FIGS. 4 to 8.

Referring to Figure 4, the manufacturing method of the inner stator according to the present invention is a parallel arrangement step (S1) for arranging a plurality of steel plates (23a) in parallel, and a fixing ring (23d) at the ends of the steel plates 23a arranged in parallel Joining both ends of the insertion step (S2) for inserting (23f), the bending step (S3) for bending the inserted retaining ring (23d) (23f) in a circle, and the bent fixing ring (23d) (23f) A bonding step is provided.

In the parallel arrangement step (S1), as shown in FIG. 5, a plurality of steel plates 23a formed of rectangular thin plates and having locking protrusions 23b and 23c formed on upper and lower sides thereof are arranged in parallel. In this parallel arrangement step (S1), it is preferable to arrange the steel plates 23a in advance through a jig device (not shown) so that the respective engagement protrusions 23b and 23c are exactly matched. This is to facilitate the insertion of the first and second fixing rings 23d and 23f.

6, the first fixing ring 23d and the second fixing ring 23f are inserted into the ends of the steel plates 23a arranged in parallel in the preparation step S1 as shown in FIG. 6. That is, as described above, the first fixing ring 23d and the second fixing ring 23f are provided with locking grooves 23e and 23g in the longitudinal direction, respectively, in each of the locking grooves 23e and 23g. When the first fixing ring 23d and the second fixing ring 23f are assembled to the upper and lower portions of the steel plates 23a arranged in parallel so that the locking protrusions 23b and 23c are inserted, the steel plate 23a As the first and second fixing rings 23d and 23f are inserted at both ends, the steel sheets 23a are maintained in parallel. At this time, it is preferable to simultaneously insert the first fixing ring 23d and the second fixing ring 23f into both ends of the steel plate 23a.

In the bending step S3, as shown in FIG. 7, the first fixing ring 23d and the second fixing are formed such that the steel plates 23a and the first and second fixing rings 23d and 23f form the inner stator 23. It is a step of bending the ring 23f to the true circle. That is, the first and second fixing rings 23d and 23f inserted into the upper and lower portions of the steel sheets 23a have a predetermined inner diameter D (see FIG. 3) by using a separate bending device (not shown). Bend into a ring shape. Accordingly, the first fixing ring 23d and the second fixing ring 23f form a ring shape while being plastically deformed, whereby the steel sheets 23a are disposed in the centrifugal direction while maintaining a close state. At this time, it is preferable to simultaneously bend the first and second fixing rings 23d and 23f inserted into the upper and lower portions thereof so that the steel plates 23 are accurately disposed in the centrifugal direction.

Subsequently, the bonding step S4 is a step of joining each end of the first fixing ring 23d and the second fixing ring 23f bent in a ring shape, as shown in FIG. 8, and the first fixing ring 23d. And inner end stators for the linear compressor having a predetermined inner diameter (D) while maintaining the state in which the steel plates 23a are disposed in the centrifugal direction when both ends of the second fixing ring 23f are joined through the joining means. 23) is completed. In this embodiment, the joining means joins both ends of the first fixing ring 23d and both ends of the second fixing ring 23f by welding.

As such, the cylindrical inner stator 23 is manufactured through a process of bending the first fixing ring 23d and the second fixing ring 23f in a ring shape after arranging the steel plates 23a in parallel. Since the holder (refer to the conventional structure) of is inserted directly into the outer circumference of the cylinder 32 without being required, the assembling workability of the inner stator 23 is greatly improved.

In particular, since only the ends of the bent first fixing ring 23d and the second fixing ring 23f are joined, their workability is significantly improved as compared with the prior art, and the steel sheets 23a are not damaged during the joining operation. .

Next, the operation of the linear compressor to which the inner stator is applied and its effect will be described.

First, when power is applied to the coil 22b of the outer stator 22, a magnetic field is formed, and the magnet 21 linearly reciprocates by an electromagnetic interaction between the magnetic field and the magnet 21. In addition, the piston 34 associated with the magnet 21 linearly reciprocates the cylinder 32.

Therefore, when the piston 34 rises upward, the refrigerant flows into the cylinder 32 from the suction chamber 33a of the cylinder head 33, and when the piston 34 descends downward, the refrigerant in the cylinder 32 is compressed and the discharge chamber 33b. Is discharged to the refrigeration cycle.

The reciprocating motion of the piston 34 is made by the interaction of the magnetic field and the magnet 21 and the inner stator 23 generated in the outer stator 22 arranged concentrically on the outer side of the cylinder 32. At this time, since the steel plates 23a constituting the inner stator 23 are disposed in the centrifugal direction without any damage, the magnet 21 moves up and down between the outer stator 21 and the inner stator 23. Little physical interference or imbalance is generated.

As a result, the magnetic flux density between the outer stator 22 and the inner stator 23 is always kept constant, so that the vertical movement of the magnet 21 is smoothly performed, thereby improving the mechanical performance of the linear compressor.

As described in detail above, according to the method for manufacturing a linear compressor and a stator for a linear compressor according to the present invention, a plurality of steel sheets made of thin plates, and after being assembled with the steel sheets are bent in a ring shape to arrange the steel sheets in a centrifugal direction The inner stator is manufactured on the outer circumference of the cylinder by using the fixing ring. Accordingly, the arrangement of the steel sheets is more easily performed, thereby improving the overall assembly workability of the inner stator and also reducing the manufacturing cost.

Claims (6)

A linear compressor having a magnet disposed on an outer side of a cylinder having a piston built therein and a stator disposed on an outer circumference of the cylinder so as to be located inside the magnet, The stator; A plurality of steel sheets are formed at the end and are disposed in the centrifugal direction, The linear compressor, characterized in that the engaging groove is formed to be coupled to the locking projections to maintain the arrangement state of the steel sheets. The method of claim 1, The catching protrusion includes a first catching protrusion formed on an upper portion of the steel sheets and a second catching protrusion formed on a lower portion of the steel sheets; The fixing ring includes a first fixing ring in which the locking groove is formed in the longitudinal direction so that the first locking protrusions are fitted and coupled, and a second fixing ring in which the locking groove is formed in the longitudinal direction so that the second locking protrusions are fitted in the coupling direction. Linear compressor, characterized in that. In the manufacturing method of the stator for linear compressor disposed on the outer periphery of the cylinder, A parallel arrangement step of arranging a plurality of steel plates in parallel with protrusions formed at both ends; An inserting step of inserting fixing rings having a locking groove formed in a longitudinal direction to both ends of the steel plates arranged in parallel so that the locking projections are inserted after the parallel arrangement step; A bending step of bending the fixing ring in a ring shape such that the steel plates are arranged in the centrifugal direction after the insertion step; And a joining step of joining both ends of the fixed ring to maintain the fixed ring bent after the bending step. The method of claim 3, wherein In the joining step, a stator for a linear compressor, characterized in that for welding both ends of the fixing ring. The method of claim 3, wherein In the inserting step, the stator for linear compressor, characterized in that for inserting the fixing ring at both ends of the steel plate at the same time. The method of claim 5, The bending step manufacturing method of the stator for a linear compressor, characterized in that for bending the fixing ring inserted into both ends of the steel plate at the same time.