KR20060039621A - Linear compressor - Google Patents

Abstract

In the linear compressor according to the present invention, a fastening hole is formed in the stator cover to be fastened by a cylinder frame and a bolt. The curvature of the portion where the fastening hole is not formed in the stator cover is smaller than the curvature of the portion where the fastening hole is formed. Since the size of the stator cover is reduced, the space between the stator cover and the shell can be sufficiently secured to reduce the size of the shell, thereby reducing the size of the linear compressor.

Linear compressor, linear motor, outer stator, cylinder frame, stator cover, fastening means, lubrication means

Description

Linear compressor {Linear compressor}             

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

Figure 2 is a side cross-sectional view schematically showing a stator cover according to the prior art,

3 is a cross-sectional view showing a linear compressor according to a first embodiment of the present invention;

4 is an exploded perspective view showing a fixing structure of the linear motor according to the first embodiment of the present invention;

5 is a side cross-sectional view schematically showing a stator cover according to a first embodiment of the present invention;

6 is a sectional view showing a linear compressor according to a second embodiment of the present invention;

Figure 7 is a side cross-sectional view schematically showing a stator cover according to a second embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

50: shell 51: lower shell

52: upper shell 53: suction pipe

54: discharge pipe 55: damper

60: linear compression unit 61: linear motor

62: cylinder 63: cylinder frame

64: stator cover 65: fluid intake

66: back cover 67: suction flow path

68: suction port 69: piston

70: discharge part assembly 72: suction valve

73: discharge valve 74: discharge spring

75: inner discharge cover 76: outer discharge cover

77: connecting pipe 78: outer stator

79: bobbin 80: coil

81: inner stator 82: magnet

83: magnet frame 90: oil supply means

91: oil suction hole 92: oil discharge hole

93: oil cylinder 94: oil piston

95: first oil spring 96: second oil spring

97: oil suction passage 98: oil discharge passage

99: oil discharge cover 103: oil suction cover

104: oil flow path 105: oil intake valve

106: oil discharge valve 107: bolt

108: nut

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear compressor, and more particularly, to a linear compressor in which the stator cover is made of sheet metal molding so as to have two or more curvatures, so that the stator cover can secure a sufficient space from the shell and can be miniaturized.

Generally, a linear compressor is a device that sucks, compresses and discharges a fluid such as refrigerant gas (hereinafter, referred to as a "fluid") while linearly reciprocating a piston inside a cylinder by using a linear driving force of a linear motor.

1 is a cross-sectional view of a linear compressor according to the prior art, Figure 2 is a configuration diagram schematically showing a stator cover according to the prior art.

1 and 2, the linear compressor according to the related art is installed to be vibrated by a shell 2 containing oil O and a damper 3 installed inside the shell 2. And a linear compression unit 10 which sucks the fluid and compresses and discharges the fluid.

A suction pipe 4 through which the fluid is sucked passes through the shell 2, and a discharge pipe 5 connected by the linear compression unit 10 passes through the shell 2.

The linear compression unit 10 is arranged such that the cylinder frame 12 is provided with a cylinder 11, the back cover 14 is provided with a fluid suction passage 13 and the cylinder 11 can be linearly reciprocated A piston 16 having a suction flow path 15 formed therein so that fluid is sucked into the cylinder 11, a linear motor 20 for linearly reciprocating the piston 16, and a front end of the cylinder 11. And a discharge valve assembly 17 installed so as to be connected to the discharge pipe 5.

The linear motor 20 is composed of a stator and a mover. The stator includes an outer stator 21, an inner stator 22, a bobbin 23 provided with the outer stator 21, and the bobbin 23. A coil 24 wound around the coil 24 to form a magnetic field, and the mover includes a magnet 25 linearly moved by a magnetic force formed in the coil 24, and a magnet frame 26 to which the magnet 25 is fixed. Is done.

On the other hand, the cylinder frame 11 is located in front of the linear motor 20, the stator cover 27 is fixed to the rear of the linear motor 20, the outer stator 21 is fixed, The cylinder frame 11 and the stator cover 27 are fastened in the axial direction by the bolt 30 and the nut 31 so that the compressive force in the axial direction is applied to the outer stator 21.

The cylinder frame 11 is formed with a first through hole 28 through which the bolt 30 penetrates at a predetermined angle spaced along the circumferential direction, and the stator cover 27 corresponds to the through hole and A second through hole 29 through which the bolt 30 penetrates is formed.

In addition, the linear compression unit 10 compresses the oil O contained in the shell when the linear compression unit 10 vibrates for lubrication / cooling of the cylinder 11 and the piston 16. Oil supply means 33 for lubricating the inside of the portion 10 is provided.

The oil supply means 33 includes an oil cylinder 34 fixedly mounted to the lower side of the linear motor 20, an oil piston 35 disposed in the oil cylinder 34 so as to be linearly reciprocated, and the oil. The first and second oil springs 36 and 37 are disposed inside the oil cylinder 34 to elastically support the piston 35.

In addition, the linear compression unit 10 is formed with an oil suction passage 38 and an oil discharge passage 39 through which the oil O passes through the oil cylinder 34.

The oil cylinder 34 has an oil suction hole 40 formed at one side to suck the oil inside the shell 2, and an oil discharge hole 41 formed at the other side thereof to communicate with the oil suction flow path 38. do.

An oil suction cover 42 is mounted between the oil cylinder 34 and the stator cover 27 to shield a part of the oil suction hole 40 and support an end of the second oil spring 37. The cylinder frame 12 is equipped with an oil discharge cover 43 for forming an oil passage 44 between the cylinder frame 12.

The oil piston 35 is inserted into the oil cylinder 34, and an oil passage 45 is formed therein.

An oil intake valve 46 supported by a first oil spring is mounted on an outlet side of the oil passage 45 of the oil piston 35, and an oil discharge valve 41 is provided in an oil discharge hole 41 of the oil cylinder 34. 47) is mounted.

Referring to the operation of the linear compressor according to the prior art configured as described above are as follows.

When power is applied to the coil 24 of the outer stator 21, the electromagnetic field generated between the outer stator 21 and the inner stator 22 is changed to linearly reciprocate the magnet 25, and the magnet While the frame 26 and the piston 16 are also linearly reciprocated, fluid is sucked into the compression chamber C in the cylinder 11 through the suction pipe 4 and the fluid suction path 13 and then compressed, It is discharged to the outside through the discharge pipe (5).

At this time, while the process of compressing and discharging the fluid in the compression chamber (C) is repeated, the oil (O) contained in the inner lower portion of the shell (2) is changed according to the pressure change in the oil cylinder (34) The oil is sucked into the oil cylinder 34, lubricated / cooled between the cylinder 11 and the piston 16, and discharged to the outside of the linear compression unit 10.

That is, when the linear compression unit 10 is vibrated, the vibration is transmitted to the oil cylinder 34, the oil piston 35 is the oil cylinder (by the inertia force for the movement of the oil cylinder 34) The oil (O) is sucked and discharged while sliding inside the 34).

When the oil piston 35 is retracted, a low pressure is generated in front of the oil piston 35, the oil suction valve 46 is opened, and the oil inside the shell 2 is the oil suction hole 40. Suction is passed through the oil passage 45 of the oil piston (35).

Subsequently, when the oil piston 35 is advanced, high pressure is generated in front of the oil piston 35 to open the oil discharge valve 47, and the oil O inside the oil discharge cover 43 is opened. Is supplied between the cylinder 11 and the piston 16 through the oil suction passage 38.

On the other hand, when assembling the outer stator 21 of the linear motor 20, the outer stator 21 is located between the cylinder frame 12 and the stator cover 27 and the bolt 30 and the nut 31 The outer stator 21 is pressed by the cylinder frame 12 and the back cover 14 to fix the outer stator 21.

Here, the bolt 30 and the nut 31 are fastened to a plurality of spaced apart at radial intervals.

However, the linear compressor according to the prior art is configured such that the stator cover 27 and the cylinder frame 12 are fastened and fixed at a plurality of positions by the bolt 30 and the nut 31, and the stator cover 27 is fixed. The space between the shell and the shell 2 must be maintained. Since the stator cover 27 has a circular shape and a part to which the bolt 30 can be secured must be secured, the stator cover 27 There is a limitation in miniaturizing the linear compressor by reducing the size of.

In addition, since the stator cover 27 according to the related art cannot support the oil cylinder 34, the oil cylinder 34 is supported by the stator cover 27 and the second oil spring ( Since a separate oil suction cover 42 capable of supporting the end portion of 37) must be mounted, there is a problem in that the number of parts increases.

The present invention has been made to solve the above-mentioned problems of the prior art, the stator cover is formed to have two or more curvature, it is possible not only to realize the compactness of the compressor, but also to simplify the structure by reducing the number of parts of the oil pump It is an object to provide a linear compressor that can be achieved.

The linear compressor according to the present invention for solving the above problems is a shell, a linear motor provided inside the shell, a cylinder frame mounted to the front of the linear motor, and a stator cover mounted to the rear of the linear motor. And a piston disposed retractably into the cylinder provided in the cylinder frame, and fastening means for fixing the cylinder frame and the stator cover, wherein the stator cover has two or more curvatures. Characterized in that formed.

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

3 is a cross-sectional view showing a linear compressor according to a first embodiment of the present invention, Figure 4 is an exploded perspective view showing a fixing structure of the linear motor according to the first embodiment of the present invention, Figure 5 is a first embodiment of the present invention 1 is a side cross-sectional view schematically showing a stator cover according to an embodiment.

In the linear compressor according to the first embodiment of the present invention, as shown in FIGS. 3 to 5, the linear compression unit 60 is installed to be bufferable inside the shell 50.

The shell 50 includes a lower shell 51 having an open upper portion and an upper shell 52 mounted to cover an upper side of the lower shell 51. The lower shell 51 and the upper shell 52 An airtight space is formed between the two sides, and the oil O is contained in the inner lower portion of the lower shell 51.

One side of the shell 50 is disposed to pass through the suction pipe 53 through which the fluid is sucked, and the other side is disposed through the discharge pipe 54 through which the fluid compressed by the linear compression unit 60 is discharged. The linear compression unit 60 is vibratedly supported by a damper 55 installed in the lower shell 51.

The linear compression unit 60 includes a linear motor 61 generating a driving force, a cylinder frame 63 mounted in front of the linear motor 61 and provided with a cylinder 62, and the linear motor 61. A stator cover 64 mounted at a rear of the cylinder, a back cover 66 provided with a fluid suction passage 65, and linearly reciprocally disposed inside the cylinder 62, to the inside of the cylinder 62. A compression chamber (C) is formed between the piston (69) formed with the suction passage (67) and the suction port (68) so as to suck the fluid, and the piston (69) in front of the cylinder (62), and A discharge valve assembly 70 for discharging the fluid compressed in the compression chamber C to the discharge pipe 54, and the oil O contained in the lower portion of the shell 50, the piston 69 and the cylinder 62. It is configured to include the oil supply means 90 for lubricating.

In addition, a muffler 84 is provided between the rear of the piston 69 and the fluid suction passage 65 of the back cover 66 to reduce noise.

Here, the rear end of the piston 69 is connected to the linear motor 61 and the fastening bolt, etc., the flange portion 71 is formed to receive the driving force of the linear motor 61, the piston 69 In front of the suction valve 72 is mounted to open and close the suction port 68.

The discharge valve assembly 70 includes a discharge valve 73 for opening and closing the compression chamber C of the cylinder 62, and the discharge valve 73 is supported by the discharge spring 74 and a fluid discharge hole is formed. An inner discharge cover 75, an outer discharge cover 76 installed to form a predetermined space on the outer side of the inner discharge cover 75, and mounted on the outer discharge cover 76, and the discharge pipe 54 is connected thereto. It is configured to include a connecting pipe 77.

The linear motor 61 includes an outer stator 78 provided between the cylinder frame 63 and the stator cover 64, a bobbin 79 provided in the outer stator 78, and the bobbin 79. ) Between the coil 80 wound around the inner stator 81 and the inner stator 81 installed in the cylinder frame 63 so as to have a predetermined gap with the outer stator 78, and the outer stator 78 and the inner stator 81. The magnet 82 is arranged and reciprocated linearly by the electromagnetic force formed in the coil 80, and the magnet 82 is mounted and coupled to the flange portion 71 of the piston 69 is a straight line of the magnet 82 It is configured to include a magnet frame 83 for transmitting the kinetic force to the piston (69).

The bobbin 79 is formed in a cylindrical shape, and the outer stator 78 is disposed to be spaced apart from the bobbin 79 at a radial interval.

The oil supply means 90 includes an oil cylinder 93 having an oil suction hole 91 and an oil discharge hole 92 formed at both ends thereof, and an oil disposed in a linear reciprocating manner within the oil cylinder 93. A piston 94 and first and second oil springs 95 and 96 supporting both ends of the oil piston 94 in the oil cylinder 93.

In addition, the oil supply means 90 is an oil suction flow path 97 formed so that oil can flow from the oil cylinder 93 between the cylinder 62 and the piston 69, and the cylinder 62 and the piston. It further comprises an oil discharge flow path (98) formed so that the oil between the 69 is discharged to the outside of the linear compression unit (60).

The oil suction passage 97 is an oil passage 100 formed between the cylinder frame 63 and the oil passage 100 by an oil discharge cover 99 mounted on the cylinder frame 63. The cylinder frame suction flow path 101 formed in the cylinder frame 63 and the oil sucked into the cylinder frame suction flow path 101 so that the sucked oil passes through the cylinder frame 63 are connected to the cylinder 62 and the piston. It comprises a cylinder suction flow path 102 formed so as to refuel between the 69.

The oil suction hole 91 supports an end of the second oil spring 96 and supports an end of the oil cylinder 93 to the stator cover 64 in the oil suction hole 91. do.

An oil passage 104 is formed in the oil piston 94 so that oil introduced from the oil suction hole 91 passes, and an oil suction valve 105 is provided at an inlet side of the oil passage 104. The oil discharge valve 106 is mounted between the oil cylinder 93 and the oil discharge cover 99.

On the other hand, as shown in Figure 4, the stator cover 64 and the cylinder frame 63 is fastened in the axial direction by a fastening means to apply a compressive force to the outer stator 78, the fastening means is A bolt 107 is formed to have a long length in the axial direction so as to penetrate the cylinder frame 63 and the stator cover 64 in the front-rear direction, and a nut 108 fastened to the bolt 107.

Here, the stator cover 64 is formed to be in close contact with the outer stator 78, the disc portion 109 is formed in the center hole, and the flange portion protruding toward the rear from the outer peripheral surface of the disc portion 109 Consists of 110.

A through hole 111 is formed in the cylinder frame 63 so that the bolt 107 penetrates, and the bolt 107 penetrates the through hole 111 in the disc part 109 of the stator cover 64. ) Is fastened so that the fastening hole 112 is fastened to the nut 108.

The plurality of fastening holes 112 are formed at positions radially spaced apart from the disc portion 109 of the stator cover 64 by the bar, and the through holes 111 and the fastening holes 112 correspond to each other. The through hole 11 and the fastening hole 112 are formed at four positions spaced apart from each other by 90 degrees from the cylinder frame 63 and the stator cover 64.

On the other hand, the stator cover 64 has two spaces so that a predetermined space is maintained between the outer circumferential surface of the stator cover 64 and the shell 50 and a space in which the bolt 107 can be secured is secured. Consists of a non-circular shape having more than two curvatures, in which the curvature κ2 of the portion where the fastening hole 112 is not formed is smaller than the curvature κ1 of the portion where the fastening hole 112 is formed Explain.

Here, the curvatures κ1 and κ2 are the inverses of the radii of curvature ρ1 and ρ2. As the curvatures κ1 and κ2 are smaller, the curvature radii ρ1 and ρ2 become larger and have a gentler shape.

That is, as shown in FIG. 5, the portion where the fastening hole 112 is not formed should be reduced in size so that the space between the shell 50 and the shell 50 can be increased. The radius of curvature ρ2 of the portion where the fastening hole 112 is not formed is preferably larger than the radius of curvature ρ1 of the portion where the fastening hole 112 is formed.

In addition, the portion in which the fastening hole 112 is formed has a radius of curvature ρ1 of the portion in which the fastening hole 112 is formed so as to secure a space in which the bolt 107 can be fastened and to compensate for the strength. ) Is smaller than the radius of curvature ρ2 of the portion where the fastening hole 112 is not formed.

Here, the stator cover 64 is manufactured by sheet metal molding to facilitate design and fabrication.

The operation of the linear compressor according to the first embodiment of the present invention configured as described above is as follows.

First, when a voltage is applied to the coil 80, a magnetic field is formed around the coil 80, the magnet 82 is linearly reciprocated by the interaction with the magnetic field, and the The linear reciprocating motion is transmitted to the piston 69 through the magnet frame 83 so that the piston 69 linearly reciprocates to the cylinder 62.

The suction valve 72 and the discharge valve 73 are operated by the pressure difference before and after the compression chamber C according to the linear reciprocating motion of the piston 69, and the fluid inside the shell 50 is transferred to the bag. After passing through the fluid suction passage 65 of the cover 66, the muffler 84, the suction passage 67 of the piston 69 and the suction port 68 in order, and is sucked into the compression chamber (C), the piston After being compressed by 69, it is discharged through the discharge valve assembly 70 and the discharge pipe 54 in order.

Meanwhile, while the piston 69 is linearly reciprocated as described above, and the fluid inside the shell 50 is sucked, compressed, and discharged, the oil O contained in the inner lower portion of the shell 50 is supplied to the oil supply. It is sucked in accordance with the pressure change inside the means 90, lubricated and cooled between the cylinder 62 and the piston 69, and is discharged to the outside of the linear compression section 60.

The pressure change inside the oil supply means 90 and the oil supply process of the oil O according to this will be described in more detail as follows.

When the oil piston 94 is retracted, the oil suction valve 105 is opened, the low pressure is generated in front of the oil piston 94, the oil filled into the oil cylinder 93 is the oil The oil flow path 104 of the piston 94 is introduced to the front of the piston 69.

Here, the oil contained in the inner lower portion of the shell 50 flows into a gap between the oil suction hole 91 of the oil cylinder 93 and the oil suction cover 103 to fill the inside of the oil cylinder 93. do.

Thereafter, when the oil piston 94 is advanced, the oil intake valve 105 is closed, and a high pressure is generated in front of the oil piston 94 to open the oil discharge valve 106, and the oil cylinder The oil in 93 is lubricated between the cylinder 62 and the piston 69 via the oil passage 100, the cylinder frame suction passage 101, and the cylinder suction passage 102. The piston 69 is cooled and lubricated.

On the other hand, when assembling the linear compression unit 60, the linear motor 61 is positioned between the cylinder frame 63 and the stator cover 64, the cylinder frame 63 and the stator cover 64 is The outer stator 78 is fixed by being fastened in the front-rear direction by the bolt 107 and the nut 108.

Here, the stator cover 64 is formed in a non-circular shape having two or more curvatures, and when the circular shape is non-circular than the spaced space D with the shell 50, the stator cover 64 and Since the space (D ') can be sufficiently secured, the size of the shell 50 can be reduced, contributing to the miniaturization of the linear compressor.

6 is a cross-sectional view showing a linear compressor according to a second embodiment of the present invention, Figure 7 is a side cross-sectional view schematically showing a stator cover according to a second embodiment of the present invention.

The linear compressor according to the second embodiment of the present invention includes a shell 120 containing oil, a linear motor 121 provided inside the shell 120, and a cylinder mounted in front of the linear motor 121. A frame 122, a stator cover 123 mounted to the rear of the linear motor 121, a piston 125 disposed to be retractable into the cylinder 124 provided in the cylinder frame 122, and Fastening means for fixing the cylinder frame 122 and the stator cover 123, and oil supply means 140 for supplying the oil (O) contained in the shell 120 to the piston 125 and the cylinder 124 It is configured to include.

The linear motor 121 includes an outer stator 126 installed between the cylinder frame 122 and the stator cover 123, a bobbin 127 provided in the outer stator 126, and the bobbin 127. It is disposed between the wound coil 128, the inner stator 129 installed in the cylinder frame 122 to have a predetermined gap with the outer stator 126, and the outer stator 126 and the inner stator 129. The magnet 130 is linearly reciprocated by the electromagnetic force formed in the coil 128, and the magnet 130 is mounted and coupled to the rear of the piston 125 to the linear movement force of the magnet 130 to the piston 125 It is composed of a magnet frame 131 to transmit.

The fastening means includes a bolt 132 having a long length in the axial direction so as to penetrate the cylinder frame 122 and the stator cover 123 in the front-rear direction, and a nut 133 fastened to the bolt 132. It consists of.

The oil supply means 140 has an oil cylinder 143 having oil suction holes 141 and oil discharge holes 142 formed at both ends thereof, and an oil piston disposed in a linear reciprocating manner within the oil cylinder 143. 144 and the first and second oil springs 145 and 146 which support both ends of the oil piston 144 in the oil cylinder 143.

The oil supply means 140 is an oil suction passage 147 formed to allow oil to flow between the cylinder 124 and the piston 125 from the oil cylinder 143, and the cylinder 124 and the piston 125. It further comprises an oil discharge flow path 148 is formed so that the oil between the) can be discharged to the outside of the cylinder 124.

The oil suction passage 147 is an oil passage 150 formed between the cylinder frame 122 and the oil passage 150 by an oil discharge cover 149 mounted to the cylinder frame 122. The cylinder frame suction flow path 151 formed in the cylinder frame 122 so that the sucked oil passes through the cylinder frame 122, and the oil sucked into the cylinder frame suction flow path 151, the cylinder 124 and the piston It is configured to include a cylinder suction passage 152 formed to refuel between the (125).

In addition, a through hole 153 is formed in the cylinder frame 122 so that the bolt 132 penetrates, and the bolt 132 penetrating the through hole 153 is penetrated through the stator cover 123. A fastening hole 154 is formed to be fastened to the nut 133.

Meanwhile, as shown in FIG. 7, the stator cover 123 according to the second embodiment of the present invention has a non-circular shape having two or more curvatures, and the fastening hole 154 is not formed. The curvature κ2 is smaller than the curvature κ1 of the portion where the fastening hole 154 is formed.

In addition, one end of the oil cylinder 143 in which the oil discharge hole 142 is formed is supported by the cylinder frame 122, and the other end in which the oil suction hole 141 is formed is supported by the stator cover 123. The lower curvature κ3 supporting the end of the oil cylinder 143 in the stator cover 123 may be larger than the upper curvature κ2.

Here, the curvatures κ1, κ2, and κ3 are the inverses of the radii of curvature ρ1, ρ2, and ρ3. Will be made.

That is, as shown in FIG. 7, the stator cover 123 has a radius of curvature ρ2 of a portion where the fastening hole 154 is not formed, and a radius of curvature ρ1 of a portion where the fastening hole 154 is formed. It is formed larger, the separation space between the shell 1200 and the stator cover 123 increases, and the radius of curvature ρ3 of the lower portion supporting the end of the oil cylinder 143 is the radius of curvature ρ2 of the upper portion. It is formed smaller than), it is possible to fully support the end of the oil cylinder 143.

In addition, the stator cover 123 is formed with a suction port 155 at a position corresponding to the oil suction hole 141 so that the oil (O) contained in the inner lower portion of the shell 120 can be introduced.

The oil O contained in the inner lower portion of the shell 120 sequentially passes through the suction port 155 and the oil suction hole 141, and is filled into the oil cylinder 143, and then the oil piston 144. Oil is supplied between the piston 125 and the cylinder 124 in accordance with the movement of the), thereby cooling and lubricating the piston 125 and the cylinder 124.

Here, the stator cover 123 is easy to manufacture because it is manufactured by sheet metal molding.

Therefore, in the second embodiment of the present invention, since the end portion of the oil cylinder 143 is supported by the stator cover 123, the oil suction cover can be omitted, so that the number of parts is reduced and manufacturing cost is reduced.

In the linear compressor according to the present invention configured as described above, the stator cover is formed with a fastening hole to be fastened by a cylinder frame and a bolt, and the curvature of the portion where the fastening hole is not formed in the stator cover is provided with the fastening hole. By forming smaller than the curvature of the portion, the size of the stator cover is reduced to secure a sufficient space between the stator cover and the shell to reduce the size of the shell, thereby reducing the size of the linear compressor.

In addition, since the curvature of the lower part of the stator cover is formed larger than the curvature of the upper part, since the lower part of the stator cover can fully support the end of the oil cylinder, parts such as an oil suction cover can be deleted, thereby reducing the number of parts Not only can the manufacturing cost be reduced, but there is an effect that the poor oil supply due to the misassembly of the oil suction cover is prevented to improve the reliability and the noise due to the vibration of the oil suction cover can be improved.

Claims (10)

A shell; A linear motor provided inside the shell; A cylinder frame mounted to the front of the linear motor; A stator cover mounted to the rear of the linear motor; A piston arranged to be retractable into the cylinder provided in the cylinder frame; In the linear compressor comprising a fastening means for fixing the cylinder frame and the stator cover, And the stator cover is formed to have two or more curvatures. The method of claim 1, The stator cover is a linear compressor, characterized in that a plurality of fastening holes for fastening the fastening means is formed in a radially spaced apart position. The method of claim 2, The stator cover is a linear compressor, characterized in that the curvature of the portion where the fastening hole is not formed is smaller than the curvature of the portion where the fastening hole is formed. The method of claim 3, wherein The fastening means is a linear compressor, characterized in that consisting of a bolt that penetrates the cylinder frame and the stator cover in the front and rear direction, and a nut fastened to the bolt. The method according to any one of claims 1 to 4, The linear compressor is a linear compressor, characterized in that the oil is contained in the inner lower portion of the shell, the oil supply means for lubricating the oil contained in the shell to the piston and the cylinder. The method of claim 5, wherein The oil supply means includes an oil cylinder having oil suction holes and oil discharge holes formed at both ends thereof, an oil piston disposed in a linear reciprocating manner within the oil cylinder, and a first end of holding both ends of the oil piston inside the oil cylinder. The linear compressor, characterized in that consisting of two oil springs. The method of claim 6, The oil supply means further includes an oil suction flow path formed so that oil can flow from the oil cylinder between the cylinder and the piston, and an oil discharge flow path formed so that oil between the cylinder and the piston can be discharged to the outside of the cylinder. Linear compressor, characterized in that configured to. The method of claim 7, wherein And one end of the oil cylinder is supported by the cylinder frame, and the other end is supported by the stator cover. The method of claim 8, The stator cover is a linear compressor, characterized in that the curvature of the lower portion supporting the end of the oil cylinder is smaller than the curvature of the upper portion. The method of claim 9, And a suction hole corresponding to the oil suction hole is formed below the stator cover.

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