KR100373096B1 - Linear compressor - Google Patents

Abstract

The present invention provides an inner core and an outer core, a holder for supporting one end of the outer core, a cylinder block supporting the other end of the outer core and forming a compression chamber, and a reciprocating motion in the compression chamber of the cylinder block. A linear compressor having a piston, the chamfer having a predetermined angle is formed at an inner end of the outer core, and at least one of the holder and the cylinder block has a shape corresponding to the chamfer and contacts the chamfer. Characterized in that the projection is formed. This makes it easy to assemble, improve productivity and improve the efficiency of the drive motor.

Description

Linear Compressor {LINEAR COMPRESSOR}

The present invention relates to a linear compressor, and more particularly, to a linear compressor having an improved structure of a drive motor.

As shown in FIG. 3, which is a longitudinal cross-sectional view of a conventional linear compressor, the linear compressor 101 includes a sealed outer casing 105, a compression unit 111 that sucks and discharges refrigerant, and generates power. It consists of a drive motor 131.

The compression unit 111 supports the lower end of the outer core 137, which will be described later, and the cylinder block 115 forming the compression chamber 113, and the piston 121 is installed to reciprocate in the compression chamber 113 and And a cylinder head 123 provided in a lower region of the cylinder block 115 and having a suction chamber (not shown) and a discharge chamber (not shown) of the refrigerant.

The driving motor 131 surrounds the inner core 133 provided on the outer side of the cylinder block 115 and the outer circumferential surface of the inner core 133 at a predetermined interval, and the coil 135 is wound in an annular shape therein. The magnet 141 which is provided between the outer core 137 and the inner core 133 and the outer core 137 to move up and down reciprocally by electromagnetic interaction with the magnetic fields of the inner core 133 and the outer core 137. And an inner core support part 134 provided between the inner core 133 and the cylinder block 115 to support the inner core 133 and installed on the cylinder block 115.

The upper and lower ends of the outer core 137 are provided with a holder 145 and a cylinder block 115 for supporting the outer core 137.

The outer core 137 is laminated with a plurality of core steel plates, and the stacked core steel sheets penetrate through the plurality of core fastening bolts 143 disposed at predetermined intervals at positions spaced apart from the outer circumferential surface of the outer core 137. The holder 145 and the cylinder block 115 are coupled to the core fastening bolt 143.

On the upper end of the piston 121 of the compression unit 111, one region is provided with a magnet 141 provided while maintaining a predetermined distance between the inner core 133 and the outer core 137 of the drive motor 131. The movable fixing member 151 is coupled. The mover 151 is linked to the vertical reciprocating motion of the magnet 141 described above, whereby the piston 121 performs the vertical reciprocating motion in the compression chamber 113.

In addition, a resonance spring 153 is provided in the upper region of the movable member 151 and the holder 145 to double the up and down reciprocation of the piston 121. The resonant spring 153 is coupled to a plurality of spring spacers 155 and bolts 157 which are alternately erected with the core fastening bolt 143 at the upper end of the holder 145 to the axial direction of the piston 121. It is installed in the horizontal direction with respect to, and is connected to one end of the mover 151 and the fixed shaft 159.

By this configuration, when power is applied to the coil 135 of the outer core 137, the magnetic flux induced therefrom interacts with the magnetic field by the magnet 141 connected to the mover 151 to raise and lower the piston 121. Reciprocate in the direction. When the piston 121 is reciprocated up and down, the cooling process sucked into the compression chamber 113 through the suction chamber is discharged to the discharge chamber through the compression process to obtain the cooling performance required. In addition, when assembling the outer core 137 and the magnet 141, a jig suitable for the outer diameter of the cylinder block 115 and the inner diameter of the outer core 137 is used to maintain the gap between the outer core 137 and the magnet 141. The outer core 137 and the cylinder block 115 to be concentric, and the outer core 137 is fastened to the holder 145 and the cylinder block 115 with the core fastening bolt 143, and then the jig is removed. The core 133 is assembled to fit the outer diameter of the cylinder block 115.

By the way, in the conventional linear compressor, when assembling the drive motor, it is necessary to assemble using a separate jig, which is not easy to assemble and the productivity is lowered, and foreign matter is inserted and separated between the outer core and the magnet. To reduce the reliability of the product. After assembling the drive motor, the outer core may move to the magnet side due to the force of the magnet due to insufficient bolting force or thermal expansion, and it becomes difficult to maintain uniform voids between the outer core and the magnet. If a uniform air gap is not maintained between the outer core and the magnet, the piston exerts a force on the side of the cylinder block, thereby increasing the friction loss between the piston and the cylinder block, and deteriorating the efficiency of the driving motor. In addition, since both ends of the outer core are in close contact with one surface of the holder and the cylinder block, an eddy current loss occurs from the surface of the outer core, thereby degrading the efficiency of the driving motor.

Accordingly, an object of the present invention is to provide a linear compressor that can be easily assembled, improves productivity, and improves the efficiency of the drive motor by improving the structure of the drive motor.

1 is a longitudinal sectional view of a linear compressor according to the present invention;

2 is an enlarged cross-sectional view of a main part of a driving motor of part 'A' of FIG. 1;

3 is a longitudinal sectional view of a conventional linear compressor.

* Explanation of symbols for the main parts of the drawings

1: linear compressor 11: compression unit

15: cylinder block 17,47: protrusion

19,49: depression 21: piston

31: drive motor 33: inner core

37: outer core 39: chamfer

41: magnet 45: holder

51: mover 53: resonant spring

In order to achieve the above object, the present invention, the inner core and the outer core, a holder for supporting one end of the outer core, a cylinder block supporting the other end of the outer core and forming a compression chamber, In a linear compressor having a piston reciprocating in a compression chamber, a chamfer at an angle is formed at an inner end of the outer core, and at least one of the holder and the cylinder block has a shape corresponding to the chamfer. And a protrusion formed in contact with the chamfered portion.

Here, the holder and the cylinder block has a shape corresponding to the chamfer portion and is formed with a protrusion contacting the chamfer portion, thereby maintaining a constant distance between the outer core and the magnet to facilitate assembly and drive. The efficiency of the motor can be improved.

A recess is formed in a part of the holder and the support area of the cylinder block for supporting the outer core to have a predetermined depth so that the upper and lower ends of the outer core are in contact with the holder and the cylinder block. It is possible to reduce the eddy current loss flowing from the surface of the outer core.

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

As shown in FIG. 1, which is a longitudinal cross-sectional view of the linear compressor according to the present invention, and in FIG. 2, which is an enlarged cross-sectional view of a main part of the driving motor of FIG. 1, the linear compressor 1 sucks a sealed outer casing 5 and a refrigerant. Compression unit 11 for compressing and discharging, and drive motor 31 for generating power.

The compression unit 11 supports a lower end of the outer core 37 to be described later, and includes a cylinder block 15 forming a compression chamber 13, a piston 21 installed in the compression chamber 13 so as to reciprocate. And a cylinder head 23 provided in the lower region of the cylinder block 15 and having a suction chamber (not shown) and a discharge chamber (not shown) of the refrigerant.

The driving motor 31 is surrounded by an inner core 33 provided at an outer side of the cylinder block 15 and an outer circumferential surface of the inner core 33 at a predetermined interval, and the coil 35 is wound in an annular shape therein. The magnet 41 is provided between the outer core 37 and the inner core 33 and the outer core 37 to move up and down reciprocally by electromagnetically interacting with the magnetic fields of the inner core 33 and the outer core 37. And an inner core support part 34 provided between the inner core 33 and the cylinder block 15 to support the inner core 33 and installed on the cylinder block 15.

The outer core 37 is laminated with a plurality of core steel plates, and the stacked core steel sheets penetrate through the plurality of core fastening bolts 43 arranged at predetermined intervals at positions spaced apart from the outer circumferential surface of the outer core 37. , The holder 45 to be described later and the cylinder block 15 is coupled to the core fastening bolt 43. On both inner ends of the outer core 37, that is, the chamfers 39 formed with chamfers at predetermined angles are provided on the upper inner edge and the lower inner edge of the outer core 37, which are regions of relatively small magnetic flux density. .

At the upper end of the outer core 37, a holder 45 for supporting the outer core 37 is provided. One end of the holder 45 in contact with the upper end of the outer core 37 extends from the plate surface at a predetermined angle so as to have a shape corresponding to the chamfer 39 of the outer core 37 described above, and is then chamfered. A protrusion 47 is formed to contact the 39, and one surface of the holder 45 supporting the upper end of the outer core 37 is formed with a recess 49 formed in a predetermined width and depth along the plate surface. It is. And the lower end of the outer core 37, the cylinder block 15 for supporting the outer core 37 is provided. One end of the cylinder block 15 in contact with the lower end of the outer core 37 extends and protrudes from the plate surface at a predetermined angle so as to have a shape corresponding to the chamfer 39 of the outer core 37 described above. A protruding portion 17 is formed to contact the base 39, and one surface of the cylinder block 15 supporting the lower end of the outer core 37 is recessed in a predetermined width and depth along the plate surface 19. Is formed.

On the upper end of the piston 21, a mover 51 for holding and supporting a magnet 41 provided with one region maintaining a predetermined distance between the inner core 33 and the outer core 37 of the drive motor 31. ) Is combined. The movable element 51 is linked to the up and down reciprocation of the magnet 41 described above, whereby the piston 21 performs the up and down reciprocation movement in the compression chamber 13.

In the upper regions of the movable element 51 and the holder 45, a resonance spring 53 for doubling the up and down movement of the piston 21 is provided. The resonant spring 53 is coupled to a plurality of spring spacers 55 and bolts 57 alternately erected with the core fastening bolt 43 at the upper end of the holder 45 to the axial direction of the piston 21. It is installed in the transverse direction with respect to, and is connected to one end of the movable element 51 and the fixed shaft (59).

By this configuration, when power is applied to the coil 35 wound in an annular shape inside the outer core 37, the magnetic flux induced therefrom interacts with the magnetic field by the magnet 41 connected to the mover 51. The piston 21 is reciprocated in the vertical direction. When the piston 21 reciprocates up and down, the process of discharging the refrigerant sucked into the compression chamber 13 through the suction chamber through the compression process and discharging the discharge chamber is repeatedly performed to obtain the required cooling performance. At this time, the mass of the piston 21 and the natural frequency of the resonant spring 53 are almost equivalent to the frequency of the power source to be applied, thereby ensuring a large driving force due to resonance.

In addition, a chamfer 39 is formed in a partial region having a relatively small magnetic flux density at an inner end of the outer core 37, and correspondingly, a holder 45 and a cylinder supporting the upper and lower ends of the outer core 37 are correspondingly formed. The protrusions 47 and 17 are formed in the block 15 so that the distance between the outer core 37 and the magnet 41 can be kept constant by the chamfer 39 and the protrusions 47 and 17. When assembling the core 37 and the magnet 41, the outer core 37 is placed on the cylinder block 15 without using a separate jig, and then assembled by the holder 45 and the core fastening bolt 43. 37 can be assembled while maintaining the concentric with the cylinder block (15). On the other hand, the projection 17 of the cylinder block 15 is easy to manufacture to have a concentric by processing in a cutting machine, such as during aluminum die casting or when machining the inner diameter of the cylinder block 15. In addition, by forming recesses 49 and 19 on one surface of the holder 45 and the cylinder block 15 in contact with the outer core 37, the upper and lower ends of the outer core 37 are formed of the holder 45 and the cylinder. The contact area with the block 15 is minimized to reduce the eddy current loss flowing from the surface of the outer core 37.

Here, although not shown, a protrusion may be formed in contact with the chamfer only in any one of the holder and the cylinder block corresponding to the chamfer of the outer core.

Thus, by forming a chamfer on the inner end of the outer core and a protrusion on the holder and the cylinder block corresponding to the chamfer, it is possible to assemble without using a separate jig when assembling the outer core and the magnet, Regardless of the assembly order of the inner core, assembly is possible and productivity is improved, and foreign matters generated during assembly can be reduced, thereby improving the reliability of the compressor itself. After the assembly, the outer core does not move to the magnet side due to the force of the magnet due to the lack of bolting force or thermal expansion, so that the outer core and the magnet can maintain a uniform gap, and the piston moves to the side of the cylinder block. The absence of force reduces the friction loss between the piston and cylinder block, as well as the loss of the drive motor itself.

Further, by forming a depression in one surface of the holder and the cylinder block in contact with the outer core, it is possible to reduce the eddy current loss flowing from the surface of the outer core to improve the efficiency of the drive motor.

As described above, according to the linear compressor according to the present invention, by improving the structure of the drive motor, the assembly is easy, productivity can be improved, and the efficiency of the drive motor can be improved.

Claims (3)

A linear having an inner core and an outer core, a holder for supporting one end of the outer core, a cylinder block for supporting the other end of the outer core and forming a compression chamber, and a piston for reciprocating motion in the compression chamber of the cylinder block. In the compressor, A chamfer having a predetermined angle is formed at an inner end of the outer core, and at least one of the holder and the cylinder block has a shape corresponding to the chamfer and a protrusion formed in contact with the chamfer. compressor. The method of claim 1, The holder and the cylinder block has a shape corresponding to the chamfered portion and the linear compressor, characterized in that the projection is formed in contact with the chamfered portion. The method according to claim 1 or 2, And a recessed portion formed at a predetermined depth in a part of the holder supporting the outer core and the cylinder block.