KR100657499B1 - Linear compressor - Google Patents

Abstract

A linear compressor is provided to simplify structure of a support means integrated with an oil cover by omitting a separate support member, thereby reducing manufacturing cost. A linear compressor includes a shell, a frame, a linear motor, a cylinder(52), a piston(53), an oil feed device, a pumping device, and a support device. The shell contains oil. The frame is installed in the shell. The linear motor is fixed to the frame. The cylinder is mounted on the frame. The piston is reciprocally installed in the cylinder. The oil feed device feeds the oil contained in the shell to the piston and the cylinder. The pumping device pumps the oil to pass through the frame. The support device is installed at the frame to support one end of the pumping device.

Description

Linear compressor {Linear compressor}

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

2 is a sectional view showing a linear compressor according to the present invention;

3 is an enlarged cross-sectional view of an oil supply apparatus according to the present invention;

4 is a plan view showing a linear motor according to the present invention.

<Explanation of symbols on main parts of the drawings>

50: shell 51: frame

52: cylinder 53: piston

53a: suction flow path 53b: suction port

53c: oil pocket 54: suction pipe

55: loop pipe 56: damper

57: suction valve 60: linear motor

61: outer stator 62: inner stator

63: bobbin 64: coil

65: magnet 66: magnet frame

67: Stator cover 68: Terminal part

70: oil supply unit 71: oil cylinder

72: oil piston 73: front oil spring

74: rear oil spring 75: oil passage

76: oil cover 77: oil pipe

78: oil supply passage 79: oil discharge passage

80: discharge valve assembly 81: discharge valve

82: discharge spring 83: inner discharge cover

84: outer discharge cover 85: discharge pipe

90: oil valve 91: back cover

92: suction port 93: the first main spring

94: second main spring 95: spring supporter

96: silencer

The present invention relates to a linear compressor, in particular, the pumping means is installed so as to penetrate the frame, and is configured to support both ends of the pumping means and the oil cover and the terminal portion of the linear motor, respectively, so as to facilitate the processing of the frame Relates to a linear compressor which can be simplified and reduced in cost.

In general, a linear compressor is a device that sucks, compresses and discharges 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.

The linear compressor according to the prior art, as shown in Figure 1, is installed to be buffered by the damper (8) in the shell (2) containing the oil, and the inside of the shell (2) to suck the fluid and then compressed And the oil contained in the shell 2 when the linear compression unit 10 vibrates when the linear compression unit 10 and the linear compression unit 10 are discharged. It is configured to include a lubrication device for pumping the inside.

The shell 2 is disposed such that a suction pipe 3 through which the fluid is sucked and a discharge pipe 4 connected by the linear compression unit 10 pass through the shell 2, respectively.

The linear compression unit 10 includes a frame 16 provided with a cylinder 12, a back cover 24 provided with a fluid inlet 22, and a linear reciprocating arrangement with the cylinder 12. A piston (30) having a fluid suction passage (28) formed therein so as to suck fluid into the inside of (12), a suction valve (32) provided at the piston (30) to open and close the fluid suction passage (28), and the piston A linear motor 34 for linearly reciprocating the 30 and a discharge valve assembly 35 provided to open and close the front end of the cylinder 12 and to which the discharge pipe 4 is connected.

An oil pocket 36 for lubrication / cooling of the cylinder 12 and the piston 30 is formed on at least one side of the inner circumferential surface of the cylinder 12 and the outer circumferential surface of the piston 30.

An oil suction passage 37 is formed in the cylinder 12 and the frame 16 so that oil O is supplied from the oil supply device to the oil pocket 35, and the oil of the oil pocket 35 is connected to the cylinder 12 and the frame 16. An oil discharge passage 38 for discharging to the outside of the linear compression unit 10 is formed.

The oil supply device includes an oil pipe (39) installed so as to be partially immersed in the oil (O), an oil cover (41) for forming an oil passage (40) between the frame (16), and the linear compression portion. The oil cylinder 44 provided below the 10, the oil piston 45 arrange | positioned linearly inside the said oil cylinder 44, and the said oil cylinder so that the oil piston 45 may be elastically supported. It is operated by the pressure difference between the front and rear oil springs 46 and 47 and the oil pipe 39 and the oil passage 40 disposed inside the 44 to open the inlet of the oil passage 40. And an oil discharge valve 49 that opens and closes, and is operated by a pressure difference between the oil passage 40 and the oil suction passage 37 to open and close the outlet of the oil passage 40. It is composed.

The oil cylinder 41 is seated in a seating groove 16a formed in the frame 16, the end of the front oil spring 46 is seated in the seating groove 16a, the rear oil spring 47 The end of is seated on the stopper 50 fitted to the rear end of the oil cylinder 41.

The operation of the oil supply device in the linear compressor configured as described above is as follows.

When the oil piston 45 is retracted, a low pressure is generated in the oil passage 40 to open the oil suction valve 48, and oil is sucked from the oil pipe 39 inside the oil passage 40. To be filled.

On the other hand, high pressure is generated in the oil passage 40 when the oil piston 45 is advanced, the oil discharge valve 49 is opened, and the oil inside the oil passage 40 is the oil suction flow path ( 37 is sequentially passed through the oil is supplied between the cylinder 12 and the piston 30.

The lubricated oil is lubricated / cooled to the cylinder 12 and the piston 30, and then discharged to the outside of the linear compression unit 10 through the oil discharge passage 38, and the inside of the shell 2. It will be put back in the lower part.

However, the linear compressor according to the related art is configured such that the front oil spring 46 is seated in the seating groove 16a of the frame 16, so that processing of the seating groove 16a in the frame 16 is difficult. In addition, since the roughness of the machining surface is bad, there is a problem that the behavior of the front oil spring 46 is not smooth, causing wear of the oil piston (45).

In addition, since a separate stopper 50 for supporting the rear oil spring 47 is required, there is a problem that the number of parts increases and is expensive.

The present invention has been made to solve the above problems of the prior art, and an object thereof is to provide a linear compressor having a simple structure for pumping oil and a low cost.

The linear compressor according to the present invention for solving the above problems is a shell containing oil, a frame installed inside the shell, a linear motor fixed to the frame, a cylinder mounted on the frame, and into the cylinder And an oil supply device for supplying a retractable piston and an oil supply device for supplying oil contained in the shell to the piston and a cylinder, the oil supply device being installed to penetrate the frame to pump oil; It is installed on and characterized in that it comprises a support means for supporting one end of the pumping means.

The support means is an oil cover which forms an oil passage between the frame.

The outer side of the linear motor is provided with a terminal portion for supplying a current to the linear motor, the terminal portion is characterized in that for supporting the other end of the pumping means.

The pumping means may include an oil cylinder installed to penetrate the frame, an oil piston disposed to linearly reciprocate the inside of the oil cylinder, and installed before and after the oil piston so as to elastically support the oil piston. It is characterized by consisting of a rear oil spring ring.

The support means is installed to support the end of the front oil spring.

The terminal portion is characterized in that it is provided to support the end of the rear oil spring.

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

2 is a cross-sectional view showing a linear compressor according to the present invention, Figure 3 is an enlarged cross-sectional view of the oil supply apparatus according to the present invention, Figure 4 is a plan view showing a linear motor according to the present invention.

As shown in FIG. 2, the linear compressor according to the present invention includes a shell 50 containing oil O, a frame 51 installed inside the shell 50, and fixedly mounted to the frame 51. The linear motor 60, the cylinder 52 mounted to the frame 51, the piston 53 arranged to be retractable into the cylinder 52, and the oil contained in the shell 50 And a lubrication device 70 for lubricating the piston 53 and the cylinder.

The shell 50 is installed so that the suction pipe 54 through which the fluid is sucked is penetrated, and the loop pipe 55 is penetrated so that the fluid compressed by the piston 53 is guided to the outside of the shell 50. do.

The frame 51 is elastically supported by a damper 56 mounted to the shell 50.

In front of the cylinder 52 is mounted a discharge valve assembly 80 for forming a compression chamber (C) between the piston (53).

The discharge valve assembly 80 is provided with a discharge valve 81 for opening and closing the compression chamber C of the cylinder 52 and a discharge spring 82 for elastically supporting the discharge valve 81. An outer discharge cover 84 provided to form a flow path between the discharge cover 83, the inner discharge cover 83, and a discharge mounted on the outer discharge cover 84 and connected to the roof pipe 55; It comprises a pipe 85.

The piston 53 has a fluid suction passage 53a and a suction port 53b formed therein to allow the fluid to be sucked into the compression chamber C.

In front of the piston 53, a suction valve 57 for opening and closing the suction port 53b is mounted by the pressure difference between the compression chamber C and the suction port 53b.

On the other hand, the linear motor 60 is composed of a large stator and a movable bar, the stator is an outer stator 61 fixed to the frame 51, and an inner stator installed to have a predetermined gap with the outer stator 61 ( 62, a bobbin 63 provided on the outer stator 61, and a coil 64 wound on the bobbin 63, wherein the mover is disposed between the outer stator 61 and the inner stator 62. The magnet 65 is arranged in the linear reciprocating motion by the electromagnetic force formed by the coil 64, and the magnet 65 is mounted and coupled to the piston 53 to the linear kinetic force of the magnet 65 It is composed of a magnet frame 66 to transmit to the piston (53).

The front of the outer stator 61 is fixed to the frame 51, the rear is mounted with a stator cover 67 covering the outer stator 61 and the bobbin 63.

As illustrated in FIG. 4, the outer stator 61 is radially disposed with a plurality of stator blocks spaced at predetermined intervals, and a terminal portion for supplying current to the coil 64 in a space formed between the stator blocks. 68 is provided.

2 and 3, the oil supply device 70 is installed to penetrate the frame 51 to pump oil, and is installed on the frame 51 to provide the pumping means. It comprises a support means for supporting one end.

The pumping means includes an oil cylinder (71) installed to penetrate the frame (51), an oil piston (72) disposed to linearly reciprocate the inside of the oil cylinder (71), and the oil piston (72). It is composed of front and rear oil springs 73 and 74 installed at the front and rear ends of the oil piston 72 to be sexually supported.

The frame 51 is formed with a through hole 51a through which the oil cylinder 71 passes.

The support means is an oil cover 76 which forms an oil passage 75 between the frame 51 and is fastened and fixed to the frame 51 by a fastening member (not shown).

Here, the oil cover 76 supports the end of the front oil spring 73, and the terminal portion 68 will be described as limited to support the end of the rear oil spring (74).

The front oil spring 73 is seated inside the oil cover 76.

The terminal portion 68 is disposed on the lower side to support the rear oil spring (74).

Here, the stator cover 67 and the frame 51 are fastened in the axial direction by a bolt (not shown) and a nut (not shown) so that the compressive force in the axial direction is applied, the axial compression force is the terminal portion As it acts on the (68), the terminal portion (68) firmly supports the rear oil spring (74).

On the other hand, the oil supply device 70 further includes an oil pipe 77 for supplying oil to the oil passage 75, one end of the oil pipe 77 is in the oil contained in the shell 50 It is installed to be locked, the other end is installed to communicate with the oil passage (76).

That is, the oil pipe 77 is formed to be bent in a '??' shape, as shown in Figures 2 and 3, it is disposed in parallel with the oil cylinder (71).

In addition, an oil pocket 53c for lubrication / cooling of the cylinder 52 and the piston 53 is formed on at least one side of the inner circumferential surface of the cylinder 52 and the outer circumferential surface of the piston 53, wherein the piston ( It will be described limited to that formed on the outer peripheral surface of 53).

The cylinder 52 and the frame 51 have an oil supply passage 78 for supplying oil from the oil passage 75 to the oil pocket 53c, and the oil of the oil pocket 53c is linearly compressed. Oil discharge passages 79 for discharging to the outside of the portion are respectively formed.

In addition, an oil valve 90 is installed at the front of the frame 51, and the oil valve 90 is operated by the pressure difference between the oil pipe 77 and the oil passage 75, so that the oil pipe ( A suction valve portion 90a for opening and closing 77 and a discharge valve portion 90b operated by the pressure difference between the oil passage 75 and the oil supply passage 78 to open and close the oil supply passage 78. The intake valve portion 90a and the discharge valve portion 90b are integrally formed.

Reference numeral 91 denotes a back cover 91 mounted with a suction port 92 through which the fluid inside the shell 50 is sucked and fastened to the stator cover 67 by a fastening bolt (not shown).

Reference numerals 93 and 94 denote first and second main springs 93 and 94 supporting the movement of the piston 53, and reference numeral 95 denotes the first and second main springs 93 and 94 to which the first and second main springs 93 and 94 are mounted. Spring supporter 95.

Reference numeral 96 denotes a silencer 96 for guiding fluid sucked into the suction pipe 92 of the back cover 91 to the piston 53 and reducing suction noise.

Looking at the operation of the linear compressor according to the present invention configured as described above are as follows.

First, a voltage is applied to the coil 64, a magnetic field is formed around the coil 64, and the magnet 65 is linearly reciprocated by the interaction with the magnetic field, and the The linear reciprocating motion is transmitted to the piston 53 through the magnet frame 66, and the piston 53 linearly reciprocates in the cylinder 52.

The suction valve 57 and the discharge valve 81 are opened and closed by the pressure difference before and after the compression chamber C according to the linear reciprocating motion of the piston 53, and the fluid inside the shell 50 is transferred to the bag. After passing through the suction pipe 92 of the cover 91, the silencer 96, the fluid suction passage 53a and the suction port 53b of the piston 53 in order, the suction chamber 92 is sucked into the compression chamber C. After being compressed by the piston 53, the discharge valve assembly 80 and the loop pipe 79 are sequentially discharged.

While the piston 53 is linearly reciprocated as described above, and the fluid inside the shell 50 is sucked, compressed, and discharged, a linear compression unit such as the frame 51 and the linear motor 60 is connected to the piston ( 53 is vibrated in a linear reciprocating direction, and the oil supply device 70 also vibrates in accordance with the vibration of the linear compression unit.

Thus, the oil piston 72 is linearly reciprocated in the oil cylinder 71.

When the oil piston 72 is retracted, a low pressure is formed in the oil passage 75, and the suction valve part 90a is opened by the pressure difference between the oil passage 75 and the oil pipe 77. The oil O contained in the shell 50 is sucked into the oil passage 75 through the oil pipe 77.

On the other hand, when the oil piston 72 is advanced, a high pressure is formed in the oil passage 75, and the discharge valve portion 90b by the pressure difference between the oil passage 75 and the oil supply passage 78 Is opened so that the oil sucked into the oil passage 75 is supplied to the oil supply passage 78.

Thereafter, the oil supplied to the oil supply passage 78 is lubricated between the cylinder 52 and the piston 53 through the oil pocket 53c to lubricate / cool the cylinder 52 and the piston 53. After the discharge, the oil is discharged to the outside of the linear compression part through the oil discharge passage 79, and is again contained in the inner lower portion of the shell 50.

On the other hand, the present invention is not limited to the above embodiment, and it is also applicable that the oil cylinder 71 is formed integrally with the frame 51.

In the linear compressor according to the present invention configured as described above, pumping means for pumping oil contained in a shell is installed to penetrate the frame, and support means for supporting the pumping means is installed in the frame, thereby pumping the frame. Since it is not necessary to perform the step processing for seating the means on the frame, and only the through hole is formed in the frame, there is an advantage that the processing of the frame is easy.

In addition, since the support means is an oil cover forming an oil passage between the frame, there is an advantage that the structure is simple and the cost is reduced because no additional support member is added.

In addition, one end of the pumping means is supported by the oil cover, the other end is configured to be supported by the terminal portion for supplying a current to the linear motor, so that a separate stopper for supporting the other end of the pumping means is deleted. As a result, the number of parts is reduced and the cost is reduced.

In addition, since the inner surface of the oil cover can be easily processed to improve the roughness, the front oil spring of the pumping means can be stably seated, and thus the oil piston smoothly behaves. There is an advantage that the wear of the front oil spring and oil piston can be reduced.

Claims (6)

A shell containing oil, a frame installed inside the shell, a linear motor fixed to the frame, a cylinder mounted on the frame, a piston disposed to be retractable into the cylinder, and oil contained in the shell. It is configured to include a lubrication device for lubricating the piston and the cylinder, The oil supply device is a linear compressor, characterized in that it comprises a pumping means installed to penetrate the frame to pump the oil, and a support means installed on the frame to support one end of the pumping means. The method of claim 1, And said support means is an oil cover which forms an oil passage between said frame. The method of claim 1, The outer side of the linear motor is provided with a terminal for supplying a current to the linear motor, And the terminal portion supports the other end of the pumping means. The method of claim 3, wherein The pumping means may include an oil cylinder installed to penetrate the frame, an oil piston disposed to linearly reciprocate the inside of the oil cylinder, and installed before and after the oil piston so as to elastically support the oil piston. A linear compressor comprising a rear oil spring. The method of claim 4, wherein The support means is a linear compressor, characterized in that installed to support the end of the front oil spring. The method according to claim 4 or 5, And the terminal portion is provided to support an end of the rear oil spring.

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