WO2007046610A1

WO2007046610A1 - Linear compressor

Info

Publication number: WO2007046610A1
Application number: PCT/KR2006/004198
Authority: WO
Inventors: Kwang Wook Kim; Gye Young Song
Original assignee: Lg Electronics Inc.
Priority date: 2005-10-18
Filing date: 2006-10-17
Publication date: 2007-04-26
Also published as: KR20070042327A; KR101155338B1

Abstract

The present invention relates to a linear compressor comprising a linear motor having a stator and a rotor, main springs supporting the rectilinear reciprocating movement of the rotor elastically, a back cover arranged as spaced apart back and forward from the linear motor and supporting an end of the main spring, a spring supporter supporting the other end of the main spring as installed between the linear motor and the back cover, and a fixing means arranged on the linear motor and fixed as pressurized on the back cover as penetrated the main spring, and has some effectiveness in that the durability and the reliability are improved as preventing the impact, noise, and damage between the back cover and the fixing bolt.

Description

LINEAR COMPRESSOR

Technical Field

[1] The present invention relates to a linear compressor and, more particularly, to a linear compressor preventing impact and noise between a back cover and fixing bolts dueto the vibration by composing the fixing bolts equipped a stator cover to be fixed by a fixing member after they are passed into the back cover. Background Art

[2] In general, a linear compressor is an instrument inhaling and compressing and discharging a fluid by rectilineary reciprocating a piston in a cylinder with a rectilinear driving force of a linear motor.

[3] FIG. 1 is a cross-sectional view illustrating the linear compressor according to the conventional art, and FIG. 2 is a cross-sectional view illustrating the magnified view of the part A of FIG. 1. The conventional linear compressor depicted in FIG. 1 comprises a shell 2 and a linear compression unit which is positioned in theinnder side of the shell 2 and compreses the fluid. An intake 4 inhaling the fluid is equipped as passing through a side of the shell 2, and the linear compressor unit is supported as capable of absorbing shock by a damper 6 installed at the shell 2.

[4] The linear compressor unit comprises a cylinder block 12 having a cylinder 10, a back cover 14 having a fluid suction pipe 15, a piston 16 arranged as capable of being advanced and retreated into the inside of the cylinder 10, a linear motor 20 driving the piston 16, and a discharge unit 18 installed on the front of the cylinder 10 to discharge the fluid compressed in the cylinder 10.

[5] The linear motor 20 is broadly composed of a stator and a rotor. The stator is composed of an outer stator 21, an inner stator 22 and a coil 23 forming a magnetic field, and the rotor is composed of a magnet 24 moved linearly by the magnetic force formed around the coil 23 and a magnet frame 25 at which the magnet 24 is fixed. The cylinder block 12 is positioned on the front of the outer stator 21, and the stator cover 26 is equipped on the rear. The piston 16 is arranged to be advanced and retreated into the cylinder 10 as receiving the rectilinear moving force of the magnet 24, so the rear is formed as an opened cylindrical shape, a suction path inhaling the fluid is formed in the inside, and a flange unit 27 for fixing on the magnet frame 25 is formed on the rear.

[6] A spring supporter 28 is coupled on the back of the magnet frame 25 to be interlocked with the magnet frame 25, and a main spring supporting the rectilinear reciprocating movement of the piston elastically is equipped on the spring supporter 28. The spring supporter is positioned between the stator cover 26 and the back cover 14, and the main spring is composed of a first main spring 30 equipped between the spring supporter 28 and the back cover 14, and a second main spring 32 equipped between the spring supporter 28 and the stator cover 26. Further, a fixing bolt 34 protruded at a long length toward the back cover 14 is arranged to penetrate the spring suppoter 28 and the back cover 14 on the stator cover 26. A supporter penetrating hole 28a through which the fixing bolt 34 penetrates is formed on the spring supporter 28, and a back cover penetrating hole 14a through which the fixing bolt 34 penetrated the supporter penetrating hole 28a penetrates is formed on the back cover 14 as illustrated in FIG. 2. The fixing bolt 34 is coupled and fixed with a nut on the rear of the back cover 14 after penetrated the spring supporter 28 and the back cover 14.

[7] Reference will now be made in detail to the operation of a linear compressor according to the conventional art configured as above.

[8] When the linear motor 20 is operated, the magnet 24 reciprocates rectilinearly, and the piston 16 reciprocates rectilinearly in the cylinder 10 with the rectilinear reciprocation of the magnet 24 transferred through the magnet frame 25.

[9] When the piston 16 reciprocates rectilinearly in the cylinder 10, the fluid in the shell 2 is discharged to outside of the shell 2 through the discharge unit 18 after inhaled into the fluid suction pipe 15 of the back cover 14 and compressed by the piston 16 in the cylinder 10. On the other hand, to assemble the first main spring, couple the nut 36 with the fixing bolt 34 on the rear of the back cover 14 after inserting the fixing bolt 24 into the spring supporter 28, the first main spring 30, and the back cover 14 in order.

[10] However, the linear compressor according to the conventional art has some disadvantages that the noises and the damages are generated with the impact occurred with the movement of the fixing bolt 34 in the back cover penetrating hole 14a during the twisted vibration of the linear compression unit generated as a regular gap t is formed between the back cover penetrating hole 28a and the fixing bolt 34. Disclosure of Invention Technical Problem

[11] The present invention is contrived to over come the above-mentioned conventional problems, and an object of the present invention is to provide a linear compressor improving the reliability as minimizing the impact, noise, and the damage may be generated between the back cover and the fixing bolt. Technical Solution

[12] The linear compressor to achieve the above-mentioned object comprises a linear motor composed of a stator and a rotor, a main spring supporting the rectilinear reciprocating movement of the rotor elastically, a back cover arranged spaced apart the front and the back of the linear motor and supporting an end of the main spring, a spring supporter supporting the other end of the main spring as installed between the linear motor and the back cover, and a fixing means fixed as pressurized on the back cover as penetrating the main spring.

[13] A pressurized hole in which the fixing means is pressurized is formed on the back cover.

[14] A fisxing maeans is pressurized on the inner side of the back cover and a pressurizing unitin whichmain spring is insertedis protruded on the outer side of the back cover.

[15] The protruded height of the pressurizing unit is taller than the thickness of the back cover.

[16] The fixing means is provided in the stator cover equipped on the linear motor.

[17] The fixing means is fixed on the stator cover, and is a fixing bolt protruded toward the back cover.

[18] The fixing bolt is fixed with a nut on the rear of the back cover.

[19] A seating groove unit for recieving the nut is formed on the back cover.

[20] A silencer reducing the suction noise of the fluid is installed at least one of the back cover and the spring supporter.

[21] Further, the linear compressor according to the present invention comprises a linear motor composed of a stator and a rotor, a stator cover equipped on the stator, a main spring supporting the rectilinear reciprocating movement of the rotor elastically, a back cover arranged spaced apart the front and the rear of the stator cover and supporting an end of the main spring, a spring supporter supporting the other end of the main spring as installed between the stator cover and the back cover, and a fixing bolt coupled and fixed by a coupling member after pressurized into the pressurizing hole formed on the back cover as arranged on the back cover.

Advantageous Effects

[22] The linear compressor according to the present invention configured as above has some effects that the impact generated by the vibration between the back cover and the fixing bolt is minimized, and the durability and the reliability are improved as the noise and the damage are prevented, as the movement generated between the back cover and the fixing bolt is prevented as fixing the fixing bolt penetrating the spring supporter and the main spring after pressurizing on the back cover.

[23] Furthermore, The linear compressor according to the present invention configured as above has some advantages that the strength of the pressurizing unit is improved as forming the protruded height of the pressurizing unit having a pressurizing hole in which the fixing bolt is pressurized thicker than the thickness of the back cover.

[24] Moreover, The linear compressor according to the present invention configured as above has some advantages that the coupling of the fixing bolt and the nut is tighten asforming a seating groove unit on which the nut coupled with the fixing bolt is duly reached on the back cover.

Brief Description of the Drawings [25] FIG. 1 is a cross-sectional view illustrating a linear compressor according to the conventional art,

[26] FIG. 2 is a cross-sectional view illustrating the part 'A' enlarged of FIG. 1,

[27] FIG. 3 is a cross-sectional view illustrating a linear compressor according to the present invention,

[28] FIG. 4 is a cross-sectional view illustrating the part 'B' enlarged of FIG. 1.

[29] [30] < REFERENCE NUMERALS OF THE PRINCIPLE PARTS OF THE

DRAWINGS>

[31] 50: SHELL 51 : CYLINDER

[32] 52: CYLINDER BLOCK 53: FLUID SUCTION PIPE

[33] 54: BACK COVER 55: PISTON

[34] 56: INTAKE 57: DAMPER

[35] 58: FLANGE UNIT 59: SUCTION VALVE

[36] 60: LINEAR MOTOR 61 : OUTER STATOR

[37] 62: INNER STATOR 63: COIL

[38] 64: MAGNET 65: MAGNET FRAME

[39] 66: INNER DISCHARGE COVER 67: DISCHARGE VALVE

[40] 68: OUTER DISCHARGE COVER 69: DISCHARGE PIPE

[41] 70: SILENCER 71 : BODY OF THE SILENCER

[42] 72: LEAD-IN PIPE 73: STATOR COVER

[43] 74: SPRING SUPPORTER 74a: SUPPORTER PENERATING HOLE

[44] 75: FIRST MAIN SPRING 76: SECOND MAIN SPRING

[45] 80: FIXING BOLT 81 : PRESSURIZING UNIT

[46] 81a: PRESSURIZING HOLE 82: NUT

Best Mode for Carrying Out the Invention [47] Reference will now be made in detail hereinafter as for the linear compressor in accordance with a various preferred embodiments of the present invention with reference to the accompanying drawings. [48] FIG. 3 is a cross-sectional view illustrating a linear compressor according to the present invention, and FIG. 4 is a cross-sectional view illustrating the part B enlarged of FIG. 1. [49] As illustrated in FIG. 3, the linear compressor comprises a shell 50 and a linear compression unit compressing fluid as positioned in the shell.

[50] An intake 56 for inhaling fluid is penetrated through a side of the shell, and the linear compression unit is supported to be capable of absorbing shock with a damper 57 installed on the shell 50. The linear compression unit includes a cylinder block 52 having a cylinder 51, a back cover 54 having a fluid suction pipe 53, a piston 55 arranged to be capable of advanced and retreated into and from the cylinder 51, a linear motor 60 generating a driving force for the rectilinear reciprocating movement of the piston 55, and a discharge unit installed on the front of the cylinder 51 to discharge the fluid compressed in the cylinder 51.

[51] The linear motor 60 is broadly composed of a stator and a rotor. The stator is composed of an outer stator 61, an inner stator 62, and a coil 63 forming magnetic field, and the rotor is composed of a magnet 64 moved rectilinearly by the magnetic field formed around the coil 63 and a magnet frame 65 on which the magnet 64 is fixed. A piston 55 is fixed on the magnet frame65 to receive the rectilinear impetus of the magnet 64.

[52] A side of the piston 55 is inserted into the cylinder 51, and the other end is fixed on the magnet frame 65. The piston 55 is a cylindrical shape that the back part is opened, has a suction path in the inside to inhale the fluid, and has a flange unit 58 is formed on the rear to be fixed on the front of the magnet frame 65. Further, a suction pot inhaling the fluid into the compression chamber of the cylinder 51 is formed on the front of the piston 55, and a suction valve 59 opening and shutting the suction pot is equipped.

[53] The discharge unit is fixed on the cylinder block 52, and is composed of an inner discharge cover 66 having a discharge hole on a side, a discharge valve 67 opening and shutting the compression chamber of the cylinder 51 as supported by a spring on the inner discharge cover 66, and an outer discharge cover 68 arranged as forming a predetermined space on the outer side of the inner discharge cover 66. A discharge pipe 69 leading the fluid discharged from the cylinder 51 to outside of the shell 50 is connected with the outer discharge cover 68.

[54] Further, a silencer 70 reducing the suction noise is installed between the rear of the piston 55 and the fluid suction pipe 53 of the back cover 54. The silencer 70 is composed a body of the silencer 71 arranged on the rear of the piston 55 and a lead-in pipe 72 inserted into the piston 55 as extended with a long length from the body of the silencer 71.

[55] On the other hand, the cylinder block 52 is positioned on the front of the outer stator 61, and a stator cover 73 covering the outer stator 61 is equipped on the rear. The back cover 54 is arranged as spaced apart a predetermined distance with the stator cover 73. Further, a spring supporter 74 to be interlocked with the piston 55 and the magnet frame 65 is installed between the stator cover 73 and the back cover 54. That is, the spring supporter 74 is coupled on the rear of the magnet frame 65. A main spring supporting the rectilinear reciprocating movement of the piston 55 elastically is equipped on the spring supporter 74. The main spring 74 is composed of a first main spring equipped between the spring supporter 74 and the back cover 54, a second main spring 76 equipped between the spring supporter 74 and the stator cover 73, the first main sprig 75 is arranged on the upper and lower sides in the shell 50, and the second main spring 76 is arranged on the right and left sides.

[56] On the other hand, a fixing member supporting the first main spring 75 is equipped on the stator cover as penetrated the first main spring 75. A side of the fixing means is fixed on the stator cover 73, the other side is protruded toward the back cover 54, and the fixing means is a fixing bolt 80 having a screw thread on the circumference part. The fixing bolt 80 penetrates the spring supporter 74 and the first main spring 75 in order, and connects the spring supporter 74 and the back cover 54 with the stator cover 73 as fixed on the back cover 54 after pressurized. A supporter penetrating hole 74a through which the fixing bolt 80 is penetrated is formed on the spring supporter 74.

[57] Furthermore, a pressurizing hole 81a in which the fixing bolt 80 is pressurized is formed on the back cover 54 as illustrated in FIG. 4, and the pressurizing hole 81a is installed on the pressurizing unit 81 protruded toward the main spring 75. Here, the protruded height h of the pressurizing unit 81 is formed as taller than the thickness of the back cover 54 to strengthen the strength of the pressurizing unit 81. Moreover, a nut 82 is coupled with the fixing bolt 80 penetrated the pressurizing hole 81a, and a seating groove unit 54a on which the nut 82 is duly reached is formed on the back cover 54.

[58] Reference will now be made in detail to the operation of the linear compressor according to the present invention configured as above.

[59] When the linear motor 60 is operated, the magnet 64 reciprocates rectilinearly, and the piston 55 reciprocates rectilinearly in the cylinder 51 as the rectilinear movement is transferred to the piston 55 through the magnet frame 65.

[60] When the piston 55 reciprocates rectilinearly in the cylinder 51, the fluid in the shell

50 is inhaled into the fluid suction pipe 53 of the back cover 54, and is compressed by the piston 55 in the cylinder 51. Then, the compressed fluid is discharged to outside of the shell 50 through the inner/outer discharge covers 66 and 68 and the discharge pipe 69. The first main spring 75 is compressed as the spring supporter 74 is retreated with the piston 55 when the piston 55 is retreated, and the first main spring 75 supports the movement of the piston 55 elastically as restore elastically as well as the second main spring 76 is compressed with the advancing of the spring supporter 74 when the piston 55 is advanced.

[61] Reference will now be made in detail to the assembling process of the first main spring 75.

[62] First, insert the spring supporter 74 and the spring 75 in order into the fixing bolt 80 fixed on the stator cover 73. At this time, the fixing bolt 80 penetrates the supporter penetrating hole 74a of the spring supporter 74, and the rectilinear movement of the spring supporter 74 is not disturbed as the diameter of the supporter penetrating hole 74a is formed as bigger than the diameter of the fixing bolt 80. Further, the fixing bolt 80 penetrated the first main spring 75 is pressurized into the pressurizing hole 81a of the back cover 54, and the nut 82 is coupled with the fixing bolt 80 on the rear of the back cover 54.

[63] The nut 82 pushes the first main spring 75 through the back cover 54 as the nut is coupled with the fixing bolt 80. At this time, the noise and damage from the impact is prevented with the prevention of the impact from the vibration as the movement of the fixing bolt is prevented as the fixing bolt 80 is pressurized on the back cover 54.

[64] The linear compressor according to the present invention is described as above with reference to the drawings, however, the present invention isn't limited to the preferred embodiments and drawings described on this description, and the various changes by the present manufacturer are possible under the bounds of the art of the invention. Industrial Applicability

[65] The linear compressor according to the present invention configured as above has some effectiveness in that the durability and the reliability are improved as the impact generated by the vibration between the back cover and the fixing bolt is minimized and the noise and the damage by the impact is prevented with the prevention of the movement between the back cover and the fixing bolt as composing the fixing bolt penetrated the spring supporter and the main spring to be fixed on the nut after pressurized on the back cover.

[66] The linear compressor according to the present invention configured as above further has an advantage in that the pressurizing unit is strengthened as composing the protruded height of the pressurizing unit in which the fixing bolt is pressurized bigger than the thickness of the back cover.

[67] The linear compressor according to the present invention configured as above further has an advantage in that the coupling of the fixing bolt with the nut is strengthened as forming a seating groove on which the nut coupled with the fixing bolt is duly reached on the back cover.

Claims

[ 1 ] A linear compressor comprising: a linear motor having a stator and a rotor; main springs supporting the rectilinear reciprocating movement of the rotor elastically; a back cover arranged as spaced apart back and forward from the linear motor, and supporting an end of the main spring; a spring supporter supporting the other end of the main spring as installed between the linear motor and the back cover; and a fixing means arranged on the linear motor, and fixed as pressed into the back cover by penetrating the main spring. [2] The linear compressor according to claim 1, wherein an pressurizing hole in which the fixing means is pressed is formed on the back cover. [3] The linear compressor according to claim 1, wherein the back cover has a pressurizing unit protruded for the fixing means to be pressurized on the inner side, and for the main spring to be inserted on the outer side. [4] The linear compressor according to claim 3, wherein the protruded height of the pressurizing unit is taller than the thickness of the back cover. [5] The linear compressor according to claim 1, wherein the fixing means is arranged on the stator cover equipped on the linear motor. [6] The linear compressor according to claim 5, wherein the fixing means is fixed on the stator cover and includes a fixing bolt protruded toward the back cover. [7] The linear compressor according to claim 6, wherein the fixing bolt is coupled and fixed by a nut on the rear of the back cover. [8] The linear compressor according to claim 7, wherein a seating greoove for recieving the nut is formed on the back cover. [9] The linear compressor according to claim 1, wherein a silencer reducing the suction noise of the fluid is formed at least one of the back cover and the spring supporter. [10] A linear compressor comprising: a linear motor composed of a stator and a rotor; a stator cover equipped on the stator; main springs supporting the rectilinear reciprocating movement of the rotor elastically; a back cover arranged as spaced apart back and forward of the stator cover and supporting an end of the main spring; a spring supporter supporting the other end of the main spring as installed between the stator cover and the back cover; and a fixing bolt protruded on the stator cover, and coupled and fixed by the coupling member after pressurized into the pressurizing hole formed on the back cover.