KR100296280B1 - Linear compressor - Google Patents

Abstract

PURPOSE: A linear compressor is provided to reduce the manufacturing cost by not using a special closed container outside a compressor unit, reduce the overall size of the compressor, improve radiating effect, and improve compressing efficiency by preventing temperature rise of suction gas before compressing. CONSTITUTION: A linear compressor includes a tubular type case(110); a cylinder(130) forming an oil inflow path(131) and an oil outflow path(132); a piston(140) sucking, compressing, and discharging fluids coming in through a suction pipe; a discharge valve assembly controlling discharge of compressed fluids; closed circuit type oil circulation pipes(300) circulating and supplying oil to a through hole formed outside the cylinder continuously; and an oil feeder(400) pumping oil in the oil circulation pipe by an aftershock caused by reciprocation of the piston. The cylinder is coupled with the inside of the case. The piston is coupled with the through hole of the cylinder. The discharge valve assembly is installed on the front-end surface of the cylinder. The oil circulation pipe is coupled with the inlet end of the inflow path and the outlet end of the outflow path. The oil feeder is coupled with the middle part of the oil circulation pipe.

Description

Linear Compressor {LINEAR COMPRESSOR}

The present invention relates to a linear compressor using a linear motor, and more particularly, to a linear compressor capable of removing an external container of a compressor unit.

Recently, in order to solve various disadvantages of a compressor using a crankshaft, instead of eliminating the use of the crankshaft, a linear compressor that compresses refrigerant by directly reciprocating a piston using a magnet and a coil is widely used. Is shown in FIG. 1.

As shown in Figure 1, the compressor unit 10 is installed in the transverse direction inside the sealed container (C) having a predetermined shape, and the oil supply means 20 fixed to the outside of the compressor unit 10 and It is formed in the compressor unit 10 to communicate with the oil supply means 20 is composed of oil pockets (30A, 30B) is filled with the oil supplied to the sliding portion between the cylinder and the piston.

The compressor unit 10 includes a cylindrical inner case 11 installed in the inner middle of the sealed container C, a cover plate 12 coupled to cover one end of the inner case 11, and A cylinder 13 penetratingly coupled to the center of the cover plate 12, a piston 14 interposed so as to allow linear reciprocating motion inside the cylinder 13, and the other end of the inner case 11; The cylinder 13 having a cover 15 coupled to the cover 15, an outer stator 16A for the linear motor fixedly coupled to the inner circumferential surface of the inner case 11, and a predetermined gap with the outer stator 16A. A cylindrical first magnet paddle 17A having a plurality of magnets M interposed between the inner stator 16B and the inner and outer stators 16A and 16B fixed to the outer circumferential surface thereof, The first magnet paddle 17A is coupled to one end of the piston 14 An inner coil spring interposed between an annular second magnet paddle 17B press-fitted to the force side end portion and an inner circumferential surface of the inner stator 17A and the second magnet paddle 17B so as to support the inner stator 17A. 18A) and an outer coil spring 18B coupled between the cover 15 and the second magnet paddle 17B to support the movement of the piston 14.

In the drawings, reference numerals 13a and 13b denote oil inlet holes and oil outlet holes, respectively, 14a denotes refrigerant flow paths of pistons, 19 denotes refrigerant inlet pipes, P1 and P2 denote oil inlet pipes and oil outlet pipes, and S denotes support springs, V, respectively. Is the valve assembly.

The conventional linear compressor as described above is operated as follows.

That is, when current is applied to the linear motor, the magnet M reciprocates linearly, causing the piston 14 to reciprocate in the cylinder 13, and the piston 14 reciprocates in the cylinder 13. Accordingly, after the refrigerant gas introduced into the sealed container C is sucked into the compression chamber (unsigned) of the cylinder 13 through the refrigerant passage 14a formed at the center of the piston 14 and compressed, the valve assembly V is opened. It was to repeat the process to be discharged through.

Here, the refrigerant gas supplied from the evaporator (more precisely, the accumulator) of the conventional refrigeration cycle apparatus is sealed container (C) through the suction pipe 19 communicated from the evaporator (not shown) to one side wall of the sealed container (C). ) Is ejected into the inside of the closed container (C), and the refrigerant gas is sucked into the compression chamber formed inside the cylinder (13) by the pressure difference during the reciprocating motion of the piston (14) It was a compression discharge during the compression stroke of the piston (13).

In addition, when the oil supply means 20 moves in one direction together with the compressor unit 10 during the reciprocating motion of the piston 13, the mass body (not shown) interposed in the oil supply means 20 is moved. The oil in the closed container C is attracted to the oil inlet pipe P1 by self inertia, and is collected in the suction side oil pocket 30A. The oil temporarily suspended in the suction side oil pocket 30A is the piston 14. During the reciprocating movement of the oil flows through the oil inlet hole (13a) into the sliding portion between the cylinder 13 and the piston (14), the oil flowing into the sliding portion after lubricating the sliding surface and the oil outflow hole (13b) again The oil spilled into the discharge side oil pocket (30B) through the oil discharged to the discharge side oil pocket (30B) was carried out while falling naturally over the oil surface of the sealed container (C) through the oil outlet pipe (P2).

However, in the conventional linear compressor as described above, the compressor unit 10 is sealed by a sealed container C filled with a predetermined amount of oil, and the oil filled in the sealed container C is compressed by the compressor unit 10. It is to be supplied to the circulation, but this requires a separate sealed container (C) in addition to the inner case 11 of the compressor unit 10, there is a problem that the production cost is increased, as well as the entire compressor volume increases.

In addition, since the outside of the compressor unit 10 is sealed by a separate sealed container C, the heat in the compressor unit 10 is not easily discharged, and heat loss of the motor is generated, as well as the refrigerant gas is sealed. Since the suction is again sucked into the compressor unit 10 through the container C, the suction gas is primarily heated in the sealed container C, thereby causing a compression loss.

Accordingly, the present invention has been made in view of the above-described problems of the conventional linear compressor, and while maintaining the smooth oil supply while preventing the outside of the compressor unit from being sealed in a separate sealed container, the production cost is reduced and It is an object of the present invention to provide a linear compressor that can reduce its own volume.

Another object of the present invention is to allow the heat from the compressor unit to be easily discharged to the outside, thereby preventing the loss of the motor, as well as the temperature of the refrigerant gas being sucked in advance of the compression stroke, thereby significantly reducing the compression loss. To provide a linear compressor.

1 is a longitudinal sectional view showing a conventional linear compressor.

Figure 2 is a longitudinal sectional view showing a linear compressor according to the present invention.

Explanation of symbols on the main parts of the drawings

110: case 120: cover plate

130: cylinder 131,132: oil inlet, outlet

140: piston 150: cover

160A, 160B: outside, inside stator 170: magnet paddle

180A, 180B: Inner and outer coil springs 210,220: Oil pocket

300: oil circulation pipe 310: oil recovery pipe

400: Oil Feeder

In order to achieve the object of the present invention, a case in which the suction pipe is communicated with, a through hole is formed so as to communicate with the outside of the case, and an oil inflow path is formed from the outside of the case to the through hole and the case at the through hole. An oil outflow path is formed to the outside and the cylinder coupled to the inside of the case, the piston slidingly coupled to the through-hole of the cylinder for suction compression and discharge of the fluid flowing through the suction pipe and the superior of the piston A discharge valve assembly mounted on the end face of the cylinder so as to face the dot to restrict the discharge of the compressed fluid, and both ends are respectively coupled to the inflow end of the oil inflow path and the outflow end of the oil outflow path of the cylinder so that oil is passed through the cylinder. Of the closed circuit oil circulation pipe continuously supplying to the It is coupled between the linear compressor is provided, including an oil feeder for pumping the oil in the oil circulation pipe by excitation due to the reciprocating motion of the piston.

Hereinafter, the linear compressor according to the present invention will be described in detail based on the embodiment shown in the accompanying drawings.

2 is a longitudinal sectional view showing a linear compressor according to the present invention, as shown in the linear compressor according to the present invention, a cover plate coupled to cover a cylindrical case 110 and one end of the case 110; And a cylinder 130 through which the oil inflow path 131 and the oil outflow path 132 are formed, respectively, penetratingly coupled to the center of the cover plate 120, and the cylinder 130. Piston 140 interposed so as to enable a linear reciprocation in the cover, the cover 150 is coupled to the other end of the case 110, and the outer stator 160A fixedly coupled to the inner peripheral surface of the case 110, A plurality of magnets M are interposed between the inner stator 160B fixed to the outer circumferential surface of the cylinder 130 and a plurality of magnets M between the inner and outer stators 160A and 160B. Coupled to the input side of the piston 140 An inner coil spring 180A interposed between the magnet paddle 170 coupled to one side of the inner stator 160B and an inner surface of the magnet paddle 170 to support the movement of the piston 140; In order to support the movement of the piston 140, the outer coil spring 180B coupled between the cover 150 and the outer surface of the magnet paddle 170 and the discharge side of the cylinder 130 are mounted to discharge compressed gas. And the oil pockets 210 and 220 mounted on the outer surface of the cylinder 130 so as to communicate with the valve assembly V, the oil inflow passage 131 and the oil outflow passage 132 of the cylinder 130, respectively, A closed circuit oil circulation pipe 300 communicating with the oil pockets 210 and 220, and a conventional oil feeder 400 mounted in the middle of the oil circulation pipe 300.

The oil pool groove 111 is formed to protrude outwardly on one side of the case 110, the oil recovery pipe 310 communicated with the oil pool groove 111 is coupled to the suction side of the oil feeder 400 In communication with the suction end of the circulation pipe 300, the oil circulation pipe 300 is already filled with a predetermined amount of oil.

In the drawings, the same reference numerals are given to the same parts as in the prior art.

19, which is not described, is a refrigerant suction pipe.

The general operation of the linear compressor according to the present invention configured as described above is the same as in the prior art.

That is, when power is applied to the compressor unit, the magnet paddle 170 reciprocates between the inner and outer stators 160A and 160B, and the piston 140 integrated with the magnet paddle 170 has a cylinder ( The refrigerant gas is sucked and compressed while reciprocating in the interior of the container 130, and is discharged to the condenser (not shown) through the valve assembly (V).

At this time, the reciprocating motion of the magnet paddle 170 is transferred to the case 110 and the cylinder 130 by the inner and outer coil springs (180A, 180B), and then the oil circulation pipe 300 is the magnet paddle 170 ) And reciprocating movement of oil supply cylinder (unsigned) is also reciprocating in a straight line, when the reciprocating movement of such oil supply cylinder (unsigned) due to the inertial force of the mass (unsigned) inserted therein The oil filled in the oil circulation pipe 300 is pushed into the suction side oil pocket 210 and flows into the sliding portion between the cylinder 130 and the piston 140 through the oil inlet 131, and At the same time, the oil in the sliding portion between the cylinder 130 and the piston 140 is guided to the discharge side oil pocket 220 along the oil outflow path 132 of the cylinder 130 and again along the oil circulation pipe 300. It enters the supply container (unsigned).

On the other hand, a portion of the oil introduced between the cylinder 130 and the piston 140 is buried in the outer peripheral surface of the piston 140 during the reciprocating movement of the piston 140 to fall into the case 110, such oil is the case 110 Into the oil pool groove 111 of the) is to be re-introduced back to the oil supply tank (unsigned) through the oil return pipe (310).

As described above, in the linear compressor according to the present invention, the through-hole is formed in the sealed case in which the suction pipe communicates, and the cylinder in which the oil inflow passage and the oil outflow passage communicated with the through-hole is fixed, and the oil of the cylinder is fixed. Combined with a closed circuit oil circulation tube for intimate communication between the inflow and the oil outflow path, and coupled to the mover of the linear motor mounted on the case, vibration caused by the reciprocating motion of the piston reciprocating in the through hole of the cylinder. By installing the oil feeder for pumping oil in the oil circulation pipe while vibrating together, the oil circulation pipe is installed in the middle of the oil circulation pipe, thereby eliminating the use of a separate container outside the compressor unit, thereby reducing the production cost and The total volume is reduced and the heat dissipation effect is increased by exposing the compressor unit to the outside. And there is an effect that the compression efficiency is improved to prevent a temperature rise of the compressed gas before inhalation.

Claims (2)

A case in which the suction pipe communicates with the case, a through hole is formed to communicate with the outside of the case, and an oil inflow path is formed from the outside of the case to the through hole, and an oil outflow path is formed from the through hole to the outside of the case. A cylinder coupled to the inside of the cylinder, a piston slidably coupled to the through-hole of the cylinder to suck and compress the fluid introduced through the suction pipe, and to be discharged, and mounted to the front end surface of the cylinder to face the top dead center of the piston. A discharge valve assembly for restricting the discharge of the pressurized fluid, and both ends are respectively coupled to the inlet end of the oil inlet passage and the outlet end of the oil outlet passage of the cylinder, and the closed circuit oil circulation continuously circulates and supplies oil to the through hole of the cylinder. Coupled to the middle of the pipe and the closed circuit oil circulation pipe, Linear compressor including an oil feeder for pumping the oil in the oil circulation pipe to the camp. The linear compressor as set forth in claim 1, wherein an oil gutter groove is formed to protrude outwardly from the case, and an oil return pipe communicating with the oil gripping groove is connected to the suction side of the oil feeder.