KR20030090000A - Oilless lubricating apparatus for reciprocating compressor - Google Patents

Abstract

PURPOSE: An apparatus for oil-less lubrication of a reciprocating compressor is provided to reduce manufacturing cost by simplifying a lubrication part by lubricating frictional parts of a cylinder and a piston without oil using a sintered oil retaining body, and to improve productivity by reducing finishing process. CONSTITUTION: A lubrication part(160) is mounted to a frame unit to lubricate a reciprocating motor and a compression unit, and comprises at least one annular lubrication chamber(161) concavely formed on an inner circumferential surface of a cylinder(141) with fixed width; and an annular magnetic lubrication member(162) inserted and fixed to the lubrication chamber to lubricate frictional surfaces of the cylinder and a piston(142). The magnetic lubrication member is manufactured as a sintered oil retaining body having pores impregnated with lubricant so that the lubricant infiltrated therein is infiltrated into a sliding surface due to increase of temperature as the piston linearly reciprocates in the cylinder for boundary lubrication.

Description

Oil-free lubrication device for reciprocating compressors {OILLESS LUBRICATING APPARATUS FOR RECIPROCATING COMPRESSOR}

The present invention relates to a lubrication device for lubricating a reciprocating motion of a piston in a reciprocating compressor. More particularly, the present invention relates to an oil-free lubrication device for a reciprocating compressor that allows the piston to smoothly reciprocate in a cylinder by lubricating without oil.

In general, a reciprocating compressor is a type of suction compression of gas while the piston moves linearly, and a reciprocating compressor is a type of suction compression of gas by reciprocating the piston while the drive motor reciprocates in a straight line.

Conventional reciprocating compressors, as shown in Figure 1, the casing 10 for filling a predetermined amount of lubricating oil on the bottom surface and communicating suction pipe SP and discharge pipe DP and the inside of the casing 10 elastically To the frame unit 20 to be installed, the reciprocating motor 30 fixed to the frame unit 20 and the mover 33 reciprocates linearly, and the mover 33 of the reciprocating motor 30. Compression unit 40 coupled to and supported by the frame unit 20, the resonant spring unit 50 for inducing a resonant movement by elastically supporting the mover 33 of the reciprocating motor 30 in the movement direction and And a lubricating oil supply unit 60 which is attached to the frame unit 20 and supplies lubricating oil of the casing 10 to the sliding portion of the compression unit 30.

The frame unit 20 includes a front frame 21 supporting the compression unit, an intermediate frame 22 coupled to the front frame 21 to support the front side of the reciprocating motor 30, and an intermediate frame 22. Composed to the rear frame 23 for supporting the rear side of the reciprocating motor.

The reciprocating motor 30 has the stator 31 formed in a cylindrical shape and has a predetermined distance between the outer stator 33 and the outer stator 33 fixedly coupled to the front frame 21 and the intermediate frame 22. A stator consisting of an inner stator 32 fixed to the front frame 21 and a winding coil 34 coupled to the outer stator 33, and a linear reciprocating motion between the outer stator 33 and the inner stator 32. It consists of a magnet holder (37) formed in a cylindrical shape that can be inserted therein, and a movable member (35) consisting of a plurality of magnets (36) coupled along a circumference at regular intervals to the magnet holder (37).

The compression unit 40 is coupled to the cylinder 41 fixed to the frame unit 20 and the mover 35 of the reciprocating motor 30 to reciprocate in the compression space P of the cylinder 41. A suction valve 43 for limiting suction of refrigerant gas while opening and closing the suction flow path F of the piston 42 and the piston 42, and the discharge side of the cylinder 41. And a discharge valve assembly 44 mounted on the discharge space to limit the discharge of the compressed gas while opening and closing the compression space P.

The resonant spring unit 50 is provided between the spring support 51 which is coupled to the mover 35 and the piston of the reciprocating motor 30 and between the front side of the spring support 51 and the corresponding front frame 21. It consists of a front side resonance spring 52 to be installed, and a rear side resonance spring 53 to be installed between the rear side of the spring support 51 and the rear frame 23 corresponding thereto.

The lubricating oil supply unit 60 is attached to the lower half of the frame unit 40 and vibrates with the frame unit 40 to pump the lubricating oil of the casing 10 while vibrating with the frame unit 40 and the outlet of the lubricating oil portion 61. It consists of a lubricating oil supply flow path 62 formed in the said frame unit 40 so that the side and the compression unit 30 may communicate.

The lubrication portion 61 includes a lubricating oil cylinder 61a mounted on the outer circumferential surface of the lower half of the front frame 21, a lubricating oil piston 61b slidingly inserted into the lubricating oil cylinder 61a to pump the lubricating oil, and a lubricating oil piston ( It consists of lubricating oil springs 61c which elastically support both ends of 61b).

The lubricating oil supply passage 62 communicates with the lubricating oil suction hole 62a formed to penetrate the outer circumferential surface of the cylinder in the front frame, and has a predetermined width formed in the front frame along the outer circumferential surface of the cylinder in a negative manner. The lubricating oil pocket 62b, the lubricating oil hole 62c which is formed to penetrate the upper and lower sides of the cylinder so as to communicate with the lubricating oil pocket 62b, and the inner side of the lubricating oil hole 62c to communicate with the groove along the outer circumferential surface of the piston 42 It is connected to the fixed chamber 62d formed laterally, the outer side of the upper lubricant pocket 62c, and connected to the lubricant discharge hole 62e and the lubricant discharge hole 62e which are formed to penetrate the front frame 21. Lubricating oil return 62f formed by joining the front face of the cylinder), the outer circumferential surface of the cylinder 41, and the discharge valve assembly 44 together.

Referring to the operation and effects of the conventional reciprocating compressor as described above are as follows.

That is, when a flux is formed between the outer stator 31 and the inner stator 32 by applying power to the reciprocating motor 30, the gap between the outer stator 31 and the inner stator 32 is formed. As the placed mover 33 moves in the direction of the flux, the reciprocating motion is continuously reciprocated by the resonant spring unit 50, and together with the piston 42 reciprocating in the cylinder 41, the compression space P ) Volume was changed so that a series of processes of suction and compression of refrigerant gas into the compression space and discharge were repeated.

At this time, as shown in FIG. 2, the lubricating oil cylinder of the lubricating part 61 vibrates with the vibration caused by the reciprocating motion of the piston 31, and the lubricating oil piston pumps the lubricating oil of the casing 10 by inertia. Friction between the piston 42 and the cylinder 41 while flowing into the fixed chamber 62d through the lubricating oil suction hole 62a, the lubricating oil pocket 62b, and the lubricating oil hole 62c along the lubricating oil supply passage 62. Lubricate the cotton.

Thereafter, the lubrication oil distribution hole 62c and the lubrication oil pocket 62b, and the lubrication oil discharge hole 62e and the lubrication oil return passage 62f flowed back to the casing 10 and were recovered.

However, in the conventional reciprocating compressor as described above, not only the lubricant supply unit 60 needs to be molded separately from the frame unit 40 and then assembled, but also the configuration of the lubricant supply unit 60 as described above Due to the complexity, it is difficult to process and assemble the frame unit 20 and the compression unit 40 in which a part of the lubricating oil supply unit 60 is formed, thereby increasing the manufacturing cost of the compressor.

It is an object of the present invention to provide a lubrication-free lubrication device of a reciprocating compressor for lubricating the friction portion of the compression unit to solve the above problems in view of the problems of the lubrication device of the reciprocating compressor. .

1 is a longitudinal sectional view showing a lubrication device of a conventional reciprocating compressor;

2 is a partially enlarged cross-sectional view showing a lubrication device of a conventional reciprocating compressor;

3 is a longitudinal sectional view showing an oil-free lubrication device of the reciprocating compressor of the present invention;

4 is a partially enlarged cross-sectional view showing an oil-free lubrication device of the reciprocating compressor of the present invention;

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a cross-sectional view showing a modified example of the oil-free lubrication device of the reciprocating compressor of the present invention,

FIG. 7 is a cross-sectional view taken along the line B-B in FIG. 6; FIG.

* Description of the main parts of the drawings *

110: airtight container 120: frame unit

130: reciprocating motor 140: compression unit

141: cylinder 142: piston

160, 165: lubrication section 161, 166: fixed chamber

162, 167: lubricating member

In order to achieve the above object, the present invention provides a lubrication device of a reciprocating compressor including a lubrication unit for preventing a piston, which linearly reciprocates in a cylinder, from being worn by friction with the cylinder to suck, compress, and discharge refrigerant gas. To

The lubrication part is achieved by an oilless lubrication device of a reciprocating compressor, characterized in that it consists of a self-lubricating member fixed along the inner circumferential surface of the cylinder.

Here, the self-lubricating member is preferably a porous sintered material impregnated with lubricating oil.

Hereinafter, the configuration and operation of the lubricating device of the reciprocating compressor according to the present invention will be described in detail. FIG. 3 is a longitudinal sectional view showing the oil-free lubricating device of the reciprocating compressor according to the present invention. Is a partially enlarged cross-sectional view showing a lubrication-free lubricating device of the reciprocating compressor of FIG. 7 is a cross-sectional view taken along the line BB of FIG. 6.

As shown in FIG. 3 or FIG. 4, the reciprocating compressor of the present invention includes an airtight container 110 formed with suction pipes SP and discharge pipes DP passing through both ends, and an interior of the airtight container 110. A reciprocating motor (130) fixed to the frame unit, a compression unit (140) installed inside the sealed container to suck and compress gas, and a frame unit (120) for supporting the reciprocating motor (130) and the compression unit (140); , The spring unit 150 which induces resonance by elastically supporting the mover 135 of the reciprocating motor 130 in the movement direction, and is mounted to the frame unit 120 so that the reciprocating motor 130 and the compression unit ( Lubricating 140 is composed of a lubrication unit (160).

The reciprocating motor 130 includes a stator 131 formed of an inner stator 132 and an outer stator 133, and a magnet 136 interposed in a gap between the inner stator 132 and the outer stator 133 and the stator 131. The magnet 136 is fixed so that the magnet holder 137 is composed of a mover 135 to linearly reciprocate with the piston.

The compression unit 140 is coupled to the mover 135 of the reciprocating motor 130 to the piston 142 to reciprocate together, and to the frame unit 120 so that the piston 142 is slidably inserted. It is mounted on the front end surface of the cylinder 141 and the intake valve 143 and the cylinder 141 which restrict the intake of gas while opening and closing the gas flow path of the piston 142. And a discharge valve assembly 144 for limiting the discharge of the compressed gas while covering the compressed space.

The resonant spring unit 150 includes a spring support 151 coupled to the mover 135 and the piston 142 of the reciprocating motor, between the front side of the spring support 151 and the corresponding front frame 121. The front side resonance spring 152 is installed, and the rear side resonance spring 153 is provided between the rear side of the spring support 151 and the corresponding rear frame 123.

On the other hand, the lubrication unit 160, as shown in the figure, at least one annular lubrication chamber 161 and the lubrication chamber 161 formed intaglio with a predetermined width on the inner peripheral surface of the cylinder 141, It is inserted into and fixed to the annular self-lubricating member 162 for lubricating the friction surface of the cylinder 141 and the piston 142.

The self-lubricating member 162 impregnates the predetermined voids in the internal space with the lubricant immersed in the sliding surface due to the temperature rise during friction with the piston 142 linearly reciprocating the inside of the cylinder 141. It is preferably made of a sintered fluid that penetrates and lubricates with boundary lubrication.

In the drawings, reference numeral 133 denotes a winding coil, 145 denotes a discharge valve, 146 denotes a discharge valve spring, and 147 denotes a discharge cover.

By such a configuration, the operation and effect of the lubrication device of the conventional reciprocating compressor will be described in detail as follows.

When a flux is formed between the inner stator 132 and the outer stator 133 by applying power to the reciprocating motor 130, the mover 135 placed in the gap between the inner stator 132 and the outer stator 133 is formed. ) Reciprocates continuously by the spring unit 150 while moving in the direction of the flux, and the piston 142 coupled to the mover 135 is the inner circumferential surface of the cylinder 141 provided with the lubrication unit 160. The volume of the compression space changes while linearly reciprocating so that the refrigerant gas is sucked and compressed into the compression space P and then discharged.

When the piston 142 reciprocates linearly, friction heat is generated by friction with the inner circumferential surface of the cylinder 141. The frictional heat causes the self-lubricating member 162 to be a sintered fluid of the lubrication unit 160. The impregnated lubricating oil flows out to the friction surface of the piston 142 and the cylinder 141 to form a lubricating film so as to perform boundary lubrication.

In addition, when the friction surface temperature of the cylinder 141 and the piston 142 is lowered when the reciprocating compressor is stopped, the lubricating oil lubricating at the friction surface of the cylinder 141 and the piston 142 is the sintered fluid. It is impregnated again by capillary phenomenon due to the pressure difference with the micropores of the lubricating member 162, and oil-free lubrication is performed as the above-described repetitive process is performed.

In addition, as shown in Figure 6 or 7, as an example of the modified lubrication unit 165, a rectangular fixed chamber 166 formed in a plurality of intaglio along the circumference of the inner peripheral surface of the cylinder 141, The fixed chamber 166 is inserted into and fixed to each other, and includes a rectangular self-lubricating member 167 for lubricating the friction surface of the cylinder 141 and the piston 142.

During operation of the reciprocating compressor, when the piston 142 is linearly reciprocated, frictional heat generated by friction with the inner circumferential surface of the cylinder 141 is generated, and the frictional heat causes the self-lubricating member 162 to be a sintered fluid. When the impregnated lubricant flows out to the friction surface of the piston 142 and the cylinder 141 to form a lubrication film and boundary lubrication, and when the operation is stopped, the temperature of the friction surface of the cylinder 141 and the piston 142 decreases. Lubricating oil is again impregnated with the sintering oil lubricating member 162 to perform oil-free lubrication.

As described above, according to the present invention, the lubrication portion is simply lubricated by lubricating oil-free lubrication using the friction portion of the cylinder and the piston, thereby reducing the manufacturing cost due to the reduction of parts and reducing the machining process. It has the effect of improving productivity.

Claims (4)

A lubrication apparatus of a reciprocating compressor comprising a lubrication unit for preventing a piston, which linearly reciprocates inside a cylinder, from being worn by friction with the cylinder to suck, compress, and discharge the refrigerant gas. The lubrication unit is an oil-free lubrication device of a reciprocating compressor, characterized in that consisting of a self-lubricating member fixed along the inner peripheral surface of the cylinder. The oil-free lubrication device for a reciprocating compressor according to claim 1, wherein the self-lubricating member is a porous sintered fluid impregnated with lubricating oil. The oil-free lubrication apparatus of claim 1, wherein the self-lubricating member is fixed in a plurality of rows in the direction of the central axis of the cylinder inner circumferential surface. The oil-free lubrication apparatus of claim 1, wherein a plurality of the self-lubricating members are fixed in the circumferential direction of the inner circumferential surface of the cylinder.