KR101911292B1 - Reciprocating compressor - Google Patents

Abstract

The present invention relates to a reciprocating compressor. Disclosure of Invention Technical Problem [7] The present invention is intended to prevent foreign matter mixed with a refrigerant gas from flowing into a fluid bearing, thereby preventing frictional loss or abrasion between the cylinder and the piston due to clogging of the fluid bearing by foreign substances, The compressor performance can be improved by preventing the increase in the volume of the compression space due to the cooling of the high temperature refrigerant gas, and the vibration and noise generated when the refrigerant is discharged from the compression space are canceled by the gas guide, .

Description

RECIPROCATING COMPRESSOR

The present invention relates to a reciprocating compressor, and more particularly to a reciprocating compressor having a fluid bearing.

Generally, a reciprocating compressor is a system in which a piston linearly reciprocates in a cylinder and sucks and compresses a refrigerant to discharge the refrigerant. Reciprocating compressors can be classified into connecting type and vibrating type according to the driving method of the piston.

In the connection type reciprocating compressor, the piston is connected to the rotating shaft of the rotating motor by a connecting rod, and the refrigerant is compressed while reciprocating in the cylinder. On the other hand, a vibrating reciprocating compressor is a system in which a piston is connected to a mover of a reciprocating motor and reciprocates in a cylinder while vibrating to compress a refrigerant. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating reciprocating compressor. In the following description, the vibrating reciprocating compressor is abbreviated as a reciprocating compressor.

The reciprocating compressor must be smoothly lubricated with the seal between the cylinder and the piston being tightly sealed so that the performance of the compressor can be improved. For this purpose, conventionally, a method of sealing and lubrication between a cylinder and a piston by supplying a lubricant such as oil between the cylinder and the piston to form an oil film is widely known. However, the method of supplying the lubricant not only requires a separate oil supply device, but also the performance of the compressor may be deteriorated due to oil shortage depending on the operating conditions. In addition, since a space for accommodating a predetermined amount of oil is required, the size of the compressor is increased, and the inlet of the oil supply device must be always locked with the oil. Therefore, the installation direction of the compressor is limited.

1 and 2, a part of the compressed gas is bypassed between the piston 1 and the cylinder 2, and the piston 1 and the cylinder 2 And a fluid bearing is formed between the outer circumferential surface and the outer circumferential surface. This is because a plurality of gas holes 2a having a small diameter are formed to penetrate the inner circumferential surface of the cylinder 2 to inject the compressed gas.

This technique does not require a separate oil supply device as compared with the oil lubrication system for supplying oil between the piston 1 and the cylinder 2, thereby simplifying the lubrication structure of the compressor, So that the performance of the compressor can be maintained consistently. Further, since there is no need for a space for accommodating oil in the casing of the compressor, the compressor can be downsized and the installation direction of the compressor can be freely designed. Reference numerals 3 and 4 denote plate springs, reference numerals 5a to 5c denote connecting bars, and numerals 6a and 6b denote links.

However, in the above-described conventional reciprocating compressor, the foreign matter mixed with the refrigerant gas flows into the fluid bearing, the fluid bearing can not be blocked and the refrigerant gas can not be supplied between the cylinder 2 and the piston 1, And the piston (1) is reciprocated in a state in which the piston (1) is in close contact with the cylinder (2), causing friction loss and wear.

Also, since the high-temperature refrigerant gas discharged from the compression space flows into the fluid bearing and heats the cylinder 2, there is a problem that the displacement of the compression space rises to cause a suction loss.

Also, there is a problem that vibration noise of the compressor is increased because the discharge noise and vibration generated when the refrigerant compressed in the compression space is discharged can not be effectively canceled.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reciprocating compressor capable of preventing foreign matter mixed with a refrigerant gas from flowing into a fluid bearing, thereby preventing frictional loss or abrasion between the cylinder and the piston while preventing the fluid bearing from being clogged by foreign matter have.

Another object of the present invention is to provide a reciprocating compressor capable of preventing the high temperature refrigerant gas discharged in the compression space from heating the cylinder and preventing the suction loss from being caused while the volume of the compression space is increased .

It is another object of the present invention to provide a reciprocating compressor capable of effectively reducing vibration and noise of a compressor by effectively canceling vibration and noise generated when refrigerant is discharged in a compression space.

In order to achieve the object of the present invention, A piston inserted into the cylinder and reciprocating; And a fluid bearing through which a gas hole is formed in the cylinder so as to support the piston with respect to the cylinder by injecting a fluid between the cylinder and the piston, wherein a gas pocket is formed on an outer circumferential surface of the cylinder so as to communicate with the gas hole, There is provided a reciprocating compressor including a filter unit for filtering out foreign substances from the refrigerant gas on a flow path for guiding the refrigerant into the gas pocket.

A casing having an internal space communicating with the suction pipe; A frame provided in an inner space of the casing; A reciprocating motor coupled to the frame, the reciprocating motor reciprocating in a straight line; A cylinder coupled to the frame and having a compression space; A piston inserted into the cylinder and performing a reciprocating motion, the piston having a suction passage formed in the longitudinal direction to guide the refrigerant into the compression space; A discharge cover provided at a front end side of the cylinder and having a discharge space communicating with the discharge pipe; And a fluid bearing having a gas hole penetrating the cylinder to inject the fluid between the cylinder and the piston to support the piston with respect to the cylinder, wherein a gas pocket is provided between the frame and the cylinder so as to communicate with the gas hole And a filter unit for filtering the foreign substances from the refrigerant gas is provided on the flow path for guiding the refrigerant into the gas pocket.

The reciprocating compressor according to the present invention blocks foreign matter mixed with the refrigerant gas from flowing into the fluid bearing, so that the gas hole of the fluid bearing is clogged by the foreign material, and the piston is brought into close contact with the cylinder, causing friction loss or wear between the cylinder and the piston Can be prevented.

Also, since the gas guide pipe is separated from the discharge cover and is provided in the internal space of the casing, the high-temperature refrigerant gas discharged from the compression space is heat-exchanged with the suction refrigerant filled in the internal space of the casing, The cylinder is cooled and the volume of the compression space is lowered, so that the performance of the compressor can be improved.

In addition, vibration and noise generated when the refrigerant is discharged from the compression space are canceled by the gas guide, so that the vibration noise of the compressor can be reduced.

1 is a longitudinal sectional view showing an example in which a conventional gas bearing is applied to a reciprocating compressor,
2 is a perspective view showing an example in which a conventional plate spring is applied to a reciprocating compressor,
3 is a longitudinal sectional view showing the reciprocating compressor of the present invention,
Fig. 4 is an enlarged view of the portion "A" in Fig. 3, which is a sectional view showing an embodiment of a fluid bearing,
FIG. 5 is a perspective view showing a gas guide of the fluid bearing according to FIG. 3,
Fig. 6 is a sectional view showing an example of the filter unit in Fig. 5,
FIGS. 7 to 10 are cross-sectional views showing other embodiments of the gas guide of the fluid bearing according to FIG. 3,
11 is a cross-sectional view showing another embodiment of the filter unit in the U-Cheng bearing according to Fig.

Hereinafter, a reciprocating compressor according to the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings.

3 is a longitudinal sectional view showing the reciprocating compressor of the present invention.

As shown, the reciprocating compressor according to the present embodiment has a suction pipe 12 connected to the internal space of the casing 10, and a discharge pipe 13 (not shown) is connected to the discharge space S2 of the discharge cover 46 ) Can be connected. A frame 20 is provided in the internal space 11 of the casing 10 and the stator 31 and the cylinder 41 of the reciprocating motor 30 are fixed to the frame 20. The cylinder 41 is provided with a reciprocating motor A resonance spring 51 for inducing a resonance motion of the piston 42 is provided on both sides of the piston 42 in the direction of movement of the piston 42. The piston 42 is connected to the piston 32 of the piston 30, (52) may be respectively installed.

A compression space S1 is formed in the cylinder 41. A suction passage F is formed in the piston 42. A suction valve 43 for opening and closing the suction passage F is provided at the end of the suction passage F And a discharge valve 44 for opening and closing the compression space S1 of the cylinder 41 may be provided on the end surface of the cylinder 41. [

In the reciprocating compressor according to the present embodiment, when the power is applied to the reciprocating motor 30, the motor 32 of the reciprocating motor 30 reciprocates with respect to the stator 31. Then, the piston 42 coupled to the mover 32 linearly reciprocates in the cylinder 41, sucks the refrigerant, compresses the refrigerant, and discharges the compressed refrigerant.

More specifically, when the piston 42 is retracted, the refrigerant in the casing 10 is sucked into the compression space S1 through the suction passage F of the piston 42. When the piston 42 advances, the suction passage F Is closed and the refrigerant in the compression space S1 is compressed. When the piston 42 further advances, the refrigerant compressed in the compression space S1 is discharged while opening the discharge valve 44 to move to the external refrigeration cycle.

Here, the reciprocating motor 30 is inserted into the stator 31 with the coil 35 inserted therein, and an air gap may be formed only on one side of the coil 35. The magnet 32 may be provided with a magnet 36 inserted in the gap of the stator 31 and reciprocating in the direction of movement of the piston.

The stator 31 includes a plurality of stator blocks 31a and a plurality of pole blocks 31b which are respectively coupled to one side of the stator block 31a and form an air gap portion 31c together with the stator blocks 31a Lt; / RTI >

The stator block 31a and the pole block 31b may be formed into a circular arc shape by axial lamination by stacking a plurality of thin stator cores. The stator block 31a is formed in the shape of a groove when projected in the axial direction, and the pole block 31b may be formed in a rectangular shape in the axial direction projection.

The mover 32 includes a magnet holder 32a formed in a cylindrical shape and a plurality of magnets 36 coupled to the outer circumferential surface of the magnet holder 32a along the circumferential direction to form a magnetic flux together with the coil 35. [ have.

The magnet holder 32a is preferably formed of a non-magnetic material to prevent flux leakage, but it is not necessary to limit the magnet holder 32a to a non-magnetic material. The outer circumferential surface of the magnet holder 32a may be formed in a circular shape so that the magnet 36 can be linearly attached and attached. A magnet mounting groove (not shown) may be formed on the outer circumferential surface of the magnet holder 32a such that the magnet 36 is inserted and supported in the direction of motion.

The magnets 36 may be formed in a hexahedron shape and may be attached to the outer circumferential surface of the magnet holder 32a. When the magnets 36 are attached one by one, the outer circumferential surface of the magnet 36 can be enclosed and fixed by a supporting member (not shown) such as a separate fixed ring or a tape made of a composite material.

The stator 31 is made up of a plurality of stator blocks 31a and the plurality of stator blocks 31a are arranged in the circumferential direction of the magnet holder 32a in the circumferential direction The magnets 36 are also attached to the outer circumferential surface of the magnet holder 32a at predetermined intervals along the circumferential direction so as to have an interval between the stator blocks so that the amount of magnet used can be minimized .

The magnet 36 is formed so as to be larger than the moving direction length of the gap 31c so as not to be smaller than the moving direction length of the gap 31c and to be larger than the moving direction length of the gap 31c in the initial position, It is preferable that the end is disposed inside the cavity 31c for stable reciprocating motion.

The magnets 36 may be arranged in the moving direction only one at a time, but in some cases, the magnets 36 may be arranged in plural along the moving direction. The magnet may be arranged so that the N pole and the S pole correspond to each other along the motion direction.

The above-described reciprocating motor may be formed such that the stator has one gap 31c, but it may be formed to have a gap (not shown) on both sides of the coil in the longitudinal direction. In this case as well, the mover can be formed in the same manner as in the above embodiment.

On the other hand, in the above-described reciprocating compressor, the friction loss between the cylinder 41 and the piston 42 must be reduced to improve the performance of the compressor. To this end, a fluid bearing is known in which a portion of the compressed gas is bypassed between the inner circumferential surface of the cylinder 41 and the outer circumferential surface of the piston 42 to lubricate between the cylinder 41 and the piston 42 by a gas force.

Fig. 4 is an enlarged view of the portion "A" in Fig. 3, and is a sectional view showing one embodiment of the fluid bearing.

3 and 4, the fluid bearing 100 includes a gas pocket 110 formed to a predetermined depth on the inner circumferential surface of the frame 20, a gas pocket 110 communicating with the gas pocket 110, And a plurality of rows of gas holes 120 formed through the inner circumferential surface. Here, the row of gas holes refers to gas holes formed on the same circumference positioned at the same length in the longitudinal direction of the cylinder.

The gas pockets 110 may be annularly formed on the entire inner circumferential surface of the frame 20, but may be formed in a plurality of predetermined intervals along the circumferential direction of the frame 20, as the case may be.

A gas guide 200 for guiding a part of the compressed gas discharged from the compression space into the discharge space S2 to the fluid bearing 100 in the discharge space may be coupled to the inlet of the gas pocket 110. [

Here, the gas pocket 110 may be formed between the frame 20 and the cylinder 41, but in some cases it may be formed in the longitudinal direction of the cylinder at the end face of the cylinder 41. In this case, Since the gas pocket 110 is formed to be in direct communication with the discharge space S2 of the discharge cover 46, no separate gas guide is needed, which simplifies the assembly process and reduces manufacturing costs.

3, the resonance spring includes a first resonance spring 51 and a second resonance spring 52, which are respectively installed on both sides in the front-rear direction of the spring supporter 53 coupled to the mover 32 and the piston 42, ).

A plurality of first resonance spring 51 and second resonance spring 52 are provided and arranged along the circumferential direction, respectively. However, only one of the first resonance spring 51 and the second resonance spring 52 may be provided, and only one resonance spring may be provided.

Since the first resonance spring 51 and the second resonance spring 52 are made of the compression coil spring as described above, a side force may be generated when the resonance springs 51 and 52 perform the stretching / have. The resonance springs 51 and 52 can be arranged so as to cancel the side force or the torsion moment of the resonance springs 51 and 52. [

For example, when the first resonance spring 51 and the second resonance spring 52 are arranged alternately in two in the circumferential direction, the first resonance spring 51 and the second resonance spring 52 have their ends The piston 42 is wound in the counterclockwise direction at the same position with respect to the center of the piston 42 and the same resonance springs located in the diagonal directions are wound around each other so that the pitching and torsional moments can be generated in opposite directions They can be arranged symmetrically with respect to each other.

The first resonance spring 51 and the second resonance spring 52 may be arranged so as to symmetrically align the end points of the respective resonance springs so that lateral tensions and torsion moments may be generated in opposite directions along the circumferential direction .

Here, the frame or the spring supporter 53 to which the ends of the first resonance spring 51 and the second resonance spring 52 are fixed is provided with a spring fixing protrusion 531 (not shown) so that the resonance springs 51 and 52 can be press- ) 532 are preferably formed, respectively, because it is possible to prevent rotation of the resonance spring.

The first resonance spring 51 and the second resonance spring 52 may be provided in the same number or in different numbers. However, the first resonance spring 51 and the second resonance spring 52 may be provided so as to have the same elastic force, respectively.

In the case where the resonance springs 51 and 52 formed of compression coil springs are applied as described above, the piston 42 may be distorted in its straightness due to the characteristics of the compression coil spring. A plurality of first resonance springs 51 and second resonance springs 52 are arranged so as to be wound in opposite directions to each other so that the lateral tensions and torsional moments generated by the respective resonance springs 51 and 52 are diagonally It is possible to maintain the straightness of the piston 42 and to prevent the surfaces contacting the resonance springs 51 and 52 from being worn out.

In addition, since the resonance springs 51 and 52 apply compression coil springs having small longitudinal deformations without restraining the lateral direction of the pistons 42, the compressors can be installed not only vertically but also horizontally, It is not necessary to connect the piston 42 and the piston 42 by separate connecting bars or links, thereby reducing the material cost and the number of assembling steps.

In this embodiment, although the piston is formed longer than the cylinder and the self weight of the piston is increased, the resonance spring is provided with the compression coil spring, which may cause deflection of the piston due to the characteristics of the compression coil spring, Friction loss or abrasion may occur between the cylinders. In particular, when the piston is supported by supplying gas without supplying oil between the cylinder and the piston, it is necessary to arrange the gas holes appropriately to prevent the piston from sagging, thereby preventing friction loss or wear between the cylinder and the piston .

For example, gas holes 120 passing through the inner circumferential surface of the cylinder 41 may be formed at regular intervals over the entire area in the longitudinal direction of the piston 42. That is, when the length of the piston 42 is longer than the length of the cylinder 41 and the piston 41 reciprocates in the lateral direction, the position of the gas hole 120 for injecting the gas between the cylinder 41 and the piston 42 is determined S1 as well as the rear region of the piston 42 as well as the front region and central region of the piston 42 adjacent to the piston. Accordingly, the fluid bearing 100 can stably support the piston 41, thereby preventing friction loss or abrasion between the cylinder 41 and the piston 42 from occurring.

Particularly, when the compression coil spring is applied to the resonance springs 51 and 52 for inducing the resonance motion of the piston 42, due to the characteristics of the compression coil spring, the lateral strain is large and the deflection of the piston may increase. However, The piston 42 smoothly reciprocates without being sagged so that the piston 42 is smoothly reciprocated between the cylinder 41 and the piston 42 due to the fact that the piston 42 is formed uniformly over the entire area A, B, C along the longitudinal direction of the piston. It is possible to effectively prevent friction loss and abrasion.

On the other hand, in the reciprocating compressor according to the present embodiment, the total cross-sectional area of the gas holes disposed in the lower half of the cylinder is required to be larger than the total cross-sectional area of the gas holes disposed in the upper half, so that deflection of the piston can be prevented, It is possible to prevent the friction loss and wear of the motor.

For this, the number of the gas holes located in the lower half of the gas holes 120 is formed to be larger than the number of the gas holes located in the upper half, or the cross-sectional area of the gas holes located in the lower half is larger than the cross- Can be largely formed. The gas holes are formed so that the number of the gas holes increases from the uppermost point to the lowermost point of the cylinder 41 or the cross-sectional area thereof increases, thereby enhancing the lower bearing force of the fluid bearing.

The gas guide grooves 125 may be formed at the entrance of the gas holes 120 to guide the compressed gas introduced into the gas pockets 110 to the respective gas holes 120 and to serve as a kind of buffer . The gas guide grooves 125 may be formed in an annular shape so that the gas holes of each column are communicated with each other, or a plurality of gas holes may be formed at regular intervals along the circumferential direction. However, it is preferable that the gas guide grooves 125 are formed at regular intervals along the circumferential direction so that the gas guide grooves 125 are provided individually for each gas hole 120, because the compression gas can be balanced and the strength of the cylinder can be compensated.

On the other hand, when the fluid bearing is applied as in the present embodiment, when the foreign matter mixed with the refrigerant flows into the fluid bearing, the foreign matter blocks the gas hole which is the fine hole and prevents the refrigerant gas from flowing smoothly between the cylinder and the piston have. This may cause friction loss or abrasion due to the piston coming into contact with the cylinder without refrigerant gas flowing between the cylinder and the piston. Therefore, it may be important to prevent the foreign matter from flowing into the fluid bearing, thereby enhancing the reliability of the compressor.

FIG. 5 is a perspective view showing the gas guide of the fluid bearing according to FIG. 3, FIG. 6 is a cross-sectional view showing an example of the filter unit in FIG. 5, Sectional views showing other embodiments.

As shown in Fig. 5, the filter unit may be installed in the middle of the gas guide tube. That is, the gas guide pipe 210 is branched to the middle of the discharge pipe 13 and connected to the inlet of the gas pocket 110, and the filter unit 220 filters the foreign substance from the refrigerant flowing into the gas pocket 110 The gas guide tube 210 can be connected to the middle of the gas guide tube 210.

The refrigerant gas flowing into the gas pocket 110 through the gas guide pipe 210 is heat-exchanged with the low-temperature suction refrigerant filled in the internal space 11 of the casing 10, It may be desirable to form it as long as possible. For this purpose, it is preferable that the gas guide tube 210 is arranged so as to surround the periphery of the gas guide tube 210 in a state of being separated from the outer peripheral surface of the winding cover 46. However, the gas guide tube 210 can be directly connected to the discharge space S2 of the discharge cover 46 coupled to the front end surface of the cylinder 41. [

5, the filter unit 220 includes a filter housing 221 connected to the middle of the gas guide tube 210, and a filter unit 222 installed inside the filter housing 221 to filter out foreign matter. .

The filter housing 221 has a filter space for filtering foreign matter and an inlet end of the filter space communicates with the discharge space S2 through the gas guide pipe 210 while an outlet end of the filter space is connected to the gas guide pipe 210 To the gas pocket 110. The gas pocket < RTI ID = 0.0 > 110 < / RTI > Sectional area of the filter space may be larger than the cross-sectional area of the gas guide tube 210. [

As shown in FIG. 6, the filter unit 222 may be a cyclone filter for filtering foreign substances such as metal pieces using a cyclone effect, or a network filter using a filtration effect. The filter unit 222 may be installed outside the filter housing 221 (for example, at the inlet end of the gas pocket) when a separate filter space is not required, such as a network filter.

7, the plurality of filter housings 221a to 221e may be connected in series by a single gas guide pipe 210. In addition, as shown in FIG. In the case where there are a plurality of filter housings, it is preferable to provide a filter unit (not shown) in only one filter housing, since it is possible to prevent the pressure of the compressed gas from being excessively lowered due to the flow path resistance .

The filter housing 221 may be installed inside the discharge cover 46 as shown in FIG. In this case, the discharge cover 46 is divided into a first discharge space S21 in which the discharge valve 44 is installed and a second discharge space S22 in which the filter portion 222 is installed. In the first discharge space S21, And the second discharge space S22 can communicate with each other. The discharge pipe 13 and the gas guide pipe 210 may be branched and connected to the outlet of the filter housing 221.

The filter housing 221 may be installed so as to surround the outside of the discharge cover 46 as shown in FIG. In this case, the discharge space S2 of the discharge cover 46 is communicated with the filter space 225 of the filter housing 221, and the discharge tube 13 is connected to the filter housing 221. [

In this case, a frusto-conical filter plate 222 may be installed on the inner circumferential surface of the filter housing 221 so as to form a cyclone filter. A gas hole 222a may be formed at one side of the filter plate 222 so as to communicate with the gas guide pipe 210.

And in this case, the filter space 225 of the filter housing 221 can be coupled to receive the inlet end of the gas pocket 110.

10, the inlet of the gas pocket 110 is formed outside the filter housing 221, the filter housing 221 and the gas pocket 110 are connected to the gas guide pipe 210, A muffler 230 may be installed in the middle of the pipe 210. In this case, the pulsation noise or vibration generated when the compressed gas is released from the earth is further attenuated through the silencer 230, so that the discharge noise or vibration of the compressor can be further attenuated. In this case, a network filter may be further provided on the outlet side of the silencer.

In the reciprocating compressor according to the present embodiment as described above, when the filter unit 220 is installed on the discharge side with the compression space S1 as the center, a part of the compressed refrigerant gas passes through the gas guide pipe 210, Flows into the filter housing 221 directly or through the discharge space S2 and passes through the filter unit 222 provided in the filter housing 221. [ As a result, foreign matter mixed with the refrigerant gas is filtered by the filter unit 222, so that foreign matter can be prevented from being introduced into the fluid bearing 100 in advance.

This prevents the gas holes formed by the fine holes from being clogged by the foreign substance, so that the fluid bearing can smoothly operate and stably support between the cylinder and the piston.

In addition, since the filter housing serves as a kind of silencer, the pressure pulsation of the discharged refrigerant can be reduced, and the discharge noise of the compressor can be reduced.

Further, since the gas guide pipe is provided outside the discharge cover and the length of the gas guide pipe is long, the compressed gas introduced into the gas pocket of the fluid bearing is cooled by the low-temperature suction refrigerant filled in the internal space of the casing It is possible to cool the cylinder constituting the gas pocket, thereby lowering the volume of the compression space and thereby improving the efficiency of the compressor.

Meanwhile, another embodiment of the filter unit of the reciprocating compressor according to the present invention is as follows.

That is, in the above-described embodiments, the filter unit is disposed on the discharge side with the compression space as the center, but in this embodiment, the filter unit is disposed on the suction side with the compression space as the center.

11, the filter units 221a to 222d may be installed inside the suction muffler 47 coupled to the inlet end of the suction passage F of the piston 42, or may be provided in the back cover 21 Or may be installed inside the suction pipe 12 coupled to the casing 10 or may be installed inside the suction muffler 15 connected to the casing 10 have.

In this case as well, the filter unit may be a network filter or a silence filter. Even in the case where the filter unit is provided on the suction side with the compression space as the center as in the present embodiment, its operation and effect are in contradiction with the above-described embodiment. However, in this embodiment, since the filter unit is installed on the suction side of the compression space, it is possible to filter the foreign matter from the refrigerant before the refrigerant is sucked into the compression space, thereby worn the cylinder and the piston by the foreign substance It can be prevented in advance.

On the other hand, in the above-described embodiments, even when the cylinder is inserted into the stator of the reciprocating motor, or when the reciprocating motor is mechanically coupled to the compression unit including the cylinder at a predetermined interval, Can be applied. A detailed description thereof will be omitted.

In the above-described embodiments, the piston is configured to reciprocate so that a resonance spring is provided on both sides of the piston in the direction of movement of the piston. In some cases, the cylinder is configured to reciprocate, May be installed. In this case as well, the position of the gas hole can be arranged as in the above-described embodiments. A detailed description thereof will be omitted.

20: Frame 30: reciprocating motor
31: stator 32:
41: cylinder 42: piston
51, 52: resonance spring 100: fluid bearing
110: gas pocket 120: gas hole
200: gas guide part 210: gas guide pipe
220: filter unit 221: filter housing
222:

Claims (9)

A reciprocating piston;
A compression space is formed so that the piston reciprocates and sucks, compresses, and discharges the refrigerant while reciprocating the piston, and a plurality of gases such that the refrigerant discharged from the compression space is injected between the piston and the piston A cylinder through which a hole is formed;
A frame in which a gas pocket is formed so as to communicate with the gas hole between the cylinder and the outer circumferential surface of the cylinder;
A discharge cover provided at a front end side of the cylinder and coupled to the frame, the discharge cover having a discharge space to receive refrigerant discharged from the compression space;
A filter space communicating with the discharge space is formed and coupled to the frame together with the discharge cover from the outside of the discharge cover, a discharge pipe communicates with one side of the filter space, and the other side of the filter space is connected to the gas pocket A communicating filter housing; And
And a filter unit disposed in the filter space to be positioned between the discharge pipe and the gas pocket and separating foreign matter from the refrigerant discharged from the discharge space to the filter space. The method according to claim 1,
Wherein an inlet of said gas pocket is formed to be received in a filter space of said filter housing. The method according to claim 1,
And a gas guide pipe communicating the filter space with the gas pocket is connected to one side of the filter housing, and the gas guide pipe is provided with a silencer. delete delete The method according to claim 1,
Wherein the filter unit has one end fixed to the inner circumferential surface of the filter housing and the other end fixed to the outer circumferential surface of the discharge cover and having a gas hole communicating between the discharge space and the filter space. The method according to claim 1,
Wherein a suction passage is formed in the piston so as to guide the refrigerant into the compression space of the cylinder in the longitudinal direction,
Wherein the filter portion is further provided on an upstream side of a suction passage of the piston based on a flow order of the refrigerant sucked into the compression space. The method according to any one of claims 1 to 3, 6, and 7,
Wherein the filter unit comprises a cyclone filter. A casing having an inner space communicating with the suction pipe;
A frame provided in an inner space of the casing;
A reciprocating motor coupled to the frame, the reciprocating motor reciprocating in a straight line;
A cylinder coupled to the frame and having a compression space;
A piston inserted into the cylinder and performing a reciprocating motion, the piston having a suction passage formed in the longitudinal direction to guide the refrigerant into the compression space;
A discharging cover coupled to the frame at a leading end side of the cylinder and having a discharging space communicating with the discharging pipe;
A gas guide groove formed in an annular shape on an outer peripheral surface of the cylinder;
A plurality of pressure chambers which are formed at predetermined intervals along the circumferential direction in the gas guide groove and penetrate the inner circumferential surface of the cylinder in the gas guide groove to inject a part of the refrigerant discharged from the compression space between the cylinder and the piston Gas hole;
A filter space communicating with the discharge space is formed and coupled to the frame together with the discharge cover from the outside of the discharge cover, a discharge pipe communicates with one side of the filter space, and the other side of the filter space communicates with the cylinder and the piston A filter housing in which an inlet of a gas pocket formed between the frame and the cylinder for guiding the refrigerant is received; And
And a filter unit disposed in the filter space to be positioned between the discharge pipe and the gas pocket and separating foreign matter from the refrigerant discharged from the discharge space to the filter space.

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