KR20100017213A - A housing unified with oil separating structure for reciprocating compressor - Google Patents

Abstract

The present invention relates to an integrated housing of an oil separation structure of a reciprocating compressor, comprising: a housing in which a suction chamber and a discharge chamber are formed, a cylinder block having a plurality of cylinder bores and coupled to the housing, and reciprocating in the cylinder bore. A housing of a reciprocating compressor comprising a piston accommodated, a piston driving means for driving the piston, and a valve device provided opposite to a bottom of the piston and having a suction port and a discharge port communicating with the suction chamber and the discharge chamber, An internal recess having a gas outlet at the bottom thereof; An outer circumferential recess formed along a circumference of the inner recess and communicating with the discharge chamber; Since the oil outlet communicating with the circulation path from the inner recess; is formed integrally, the discharge chamber is characterized in that disposed closer to the center than the suction chamber, so that the oil is separated from the refrigerant introduced into the discharge chamber and reused The efficiency of the compressor can be increased, durability can be maintained, and the oil separation structure is integrated in the housing, so that separate parts for oil separation are not required, and the processing cost is easy and the production cost can be reduced.

Description

Integrated housing for oil separation structure of reciprocating compressor {A HOUSING UNIFIED WITH OIL SEPARATING STRUCTURE FOR RECIPROCATING COMPRESSOR}

The present invention relates to an integrated housing of an oil separation structure of a reciprocating compressor, and more particularly, to separate oil before the discharged refrigerant is discharged from the discharge chamber to the outside of the compressor, and to have a heat insulating performance. An oil-separated housing integral housing is provided.

Common reciprocating compressors, which are widely used as compressors for automobile air conditioners, are commonly provided with pistons, piston drives, cylinder blocks, and valves.

As a representative example of a reciprocating compressor, swash plate compressors are used in recent years. The inclination angle of the swash plate is changed according to the change of the heat load to achieve precise movement control by controlling the feed amount of the piston, while the inclination angle is continuously changed to reduce the sudden torque fluctuation of the engine by the compressor, so that the ride comfort of the vehicle even during operation of the compressor. There is a feature to improve.

In the reciprocating compressor, the refrigerant is sucked from the suction chamber and compressed by a piston, and the compressed refrigerant is discharged to the discharge chamber and sent to the next cooling cycle.

Since some oil is mixed in the refrigerant discharged into the discharge chamber in this process, it is necessary to separate it and discharge only pure refrigerant gas. This is because the presence of oil in the refrigeration cycle increases the flow resistance, disturbs the heat transfer and lowers the overall system efficiency.

A representative configuration of an oil separator for separating oil from a refrigerant is disclosed in Japanese Patent Laid-Open No. 2004-036583, which is briefly described with reference to FIG. 1.

First, the compressor disclosed in the publication is a swash plate type compressor, which includes a front housing 1 and a rear housing 3, a cylinder block 2 disposed between the front housing 1 and the rear housing 3, and The piston 7 reciprocates in the cylinder 2a of the cylinder block 2 and is disposed in the housing through the front part of the housing 1 and 3 to transmit the rotational movement from external power. A swash plate 6 connected to the rotary shaft 4 for driving (7), the swash plate 6 connected to the plurality of pistons 7 and inclined to the rotary shaft 4, and the swash plate 6, etc. 36).

On the other hand, the oil separator 26 is provided in the vicinity of the discharge chamber 33 of the rear housing (3). The oil separator 26 is installed in the rear housing by using a centrifugal force and penetrates the valve plate 20.

Of course, the separated oil is supplied to the site requiring lubrication through the flow path 27 and the gas refrigerant is joined in the refrigerant cycle through the refrigerant outlet 54.

Technical challenge

However, in such a conventional swash plate type compressor, the oil separator 26 is provided not only through the valve plate 20 but also in the vicinity of the discharge chamber 33 instead of inside. That is, the structure of the valve plate 20 had to be matched to the oil separator 26 and a space for installing the oil separator 26 needs to be separately provided.

Therefore, the conventional assembly and manufacturing of the compressor has a disadvantage.

In addition, conventionally, since the discharged refrigerant is in direct contact with the rear housing 3, the temperature of the suction gas sucked into the suction chamber 32 is increased to affect the volumetric efficiency of the compressor.

The present invention has been made to solve the above problems, an object of the invention is to separate the oil before the refrigerant discharged from the compressor discharged to the outside of the compressor in the oil chamber of the reciprocating compressor that can maintain the performance of the compressor A separate structure integrated housing is provided.

In particular, it is an object of the present invention to provide an oil separation structure integrated housing of a reciprocating compressor that is easy to assemble and manufacture.

It is also an object of the present invention to provide an oil-separated structure integrated housing of a reciprocating compressor in which the discharged refrigerant does not thermally affect the suction refrigerant gas so that the original volumetric efficiency of the compressor can be maintained.

Technical solution

In order to achieve the above object, the oil separation structure integrated housing of the reciprocating compressor according to the present invention,

A housing having a suction chamber and a discharge chamber, a cylinder block having a plurality of cylinder bores and coupled to the housing, a piston accommodated reciprocally in the cylinder bore, piston driving means for driving the piston, and In the housing of the reciprocating compressor provided with a valve device provided opposite the bottom of the piston and in communication with the suction chamber and the discharge chamber formed with a suction port,

An internal recess having a gas outlet at the bottom thereof;

An outer circumferential recess formed along a circumference of the inner recess and communicating with the discharge chamber;

An oil outlet communicating with the circulation path from the inner recess;

The discharge chamber may be arranged closer to the center side than the suction chamber.

Here, the inner recess may be separated from the outer recess by the guide wall, and the inner recess and the outer recess may be communicated by the coolant introduction groove formed at the tip of the guide wall.

In this case, the coolant introduction groove is preferably formed to be inclined along the moving direction of the coolant.

In addition, when viewed from the axial direction, the inlet of the refrigerant introduction groove is preferably formed in a smooth curved shape.

Meanwhile, the inner recess may be separated from the outer recess by the guide wall, and the inner recess and the outer recess may communicate with each other by the refrigerant introduction hole formed in the side surface of the guide wall.

In this case, the refrigerant introduction hole is preferably formed to be inclined along the moving direction of the refrigerant.

In addition, when viewed from the axial direction, the inlet of the refrigerant introduction groove is preferably formed in a smooth curved shape.

The gas outlet is preferably formed to protrude toward the valve from the bottom of the inner recess.

As viewed from the axial direction, the outer shape of the guide wall is preferably circular.

The center of the inner recess may be eccentric with respect to the center of the gas outlet.

In this case, it is preferable to form the inlet of the coolant introduction groove or the coolant introduction hole in the wide portion of the outer circumferential recess.

Of course, the center of the inner recess may be formed to coincide with the center of the outer recess.

On the other hand, when viewed from the axial direction, the gas outlet is preferably formed in a circular shape.

1A is a longitudinal sectional view showing the structure of a conventional general swash plate compressor.

FIG. 1B is a detailed cross-sectional view illustrating the oil separation structure in FIG. 1A.

Figure 2 is a longitudinal sectional view showing the structure of a reciprocating compressor equipped with an oil separation structure integrated housing according to the present invention.

Figure 3 is a view showing a first embodiment of the oil separation structure integrated housing in Figure 2, (a) is a perspective view, (b) is a front view, (c) is a longitudinal sectional view.

Figure 4 is a view showing a second embodiment of the oil separation structure integrated housing in Figure 2, (a) is a perspective view, (b) is a front view.

Best Mode for Carrying Out the Invention

Hereinafter, with reference to the accompanying Figures 2 to 4 will be described in detail a preferred embodiment of the present invention.

First, the reciprocating compressor 1000 according to the present invention includes a housing 100, a cylinder block 110 having a plurality of cylinder bores 110a, and a drive shaft rotatably supported by the cylinder block 110. 140, the swash plate 150 is connected to the drive shaft 140 is installed so that the inclination angle can be changed while rotating, and the reciprocating movement to the cylinder bore (110a) by the sliding movement with the swash plate (150) It is formed in the housing 100 via a piston 200 that is possibly accommodated, a suction / discharge valve device 300 provided to face the bottom of the piston 200, and the suction / discharge valve device 300. The suction chamber 131 and the discharge chamber 132 are included. A shoe 201 is provided between the swash plate 150 and the piston 200.

The drive shaft 140, the swash plate 150 and the shoe 201 constitutes a piston drive means of the present invention.

The housing 100 is composed of a front housing 120 and a rear housing 130 with the cylinder block 110 interposed therebetween.

In addition, a suction chamber 131 and a discharge chamber 132 are formed in the rear housing 130, and a suction port 331 communicating the cylinder bore 110a and the suction chamber 131 to the valve plate 330. , And a discharge port 332 which communicates the cylinder bore 110a and the discharge chamber 132 with each other.

In addition, the suction port 331 and the discharge port 332 formed in the valve plate 330, suction for opening and closing the suction port 331 and the discharge port 332 by the pressure change according to the reciprocating motion of the piston 200. A valve and a discharge valve are respectively provided.

The cylinder block 110 has eight cylinder bores 110a, and the refrigerant introduced from the suction chamber 131 is continuously compressed by the piston 200 reciprocating through the cylinder bore 110a. do.

The drive shaft 140 is rotatably supported by the front housing 120 and the cylinder block 110 via a bearing 400.

In addition, the swash plate 150 is slidably coupled to the piston 200 via the shoe 201.

Furthermore, connecting projections 155 are formed before and after the swash plate 150, respectively, and a connecting link 600 is interposed between the connecting projection 155 and the driving shaft 140, and a hinge pin ( 610 is connected. Therefore, the connection link 600 and the connection protrusion 155, the connection link 600 and the drive shaft 140 can be hinged with respect to each other.

On the other hand, according to the present invention, an oil separation structure is integrally formed in the rear housing 130.

Therefore, according to the present invention, some oil contained in the refrigerant sucked from the suction chamber 131 of the rear housing 130 is separated by an oil separation structure, so that only pure gaseous refrigerant is circulated through the refrigerant cycle. . The oil separation structure according to the present embodiment is configured to separate the oil and gas refrigerant by causing centrifugal force on the mist refrigerant.

To this end, the oil separation structure 700 integrally formed in the rear housing 130 according to the present invention, the inner recess 710 is formed with a gas outlet 711 in the axial direction of the piston, the inner recess 710 And an outer circumferential recess 720 formed along the circumference and communicating with the discharge port 332, and an oil outlet 730 communicated with the outside from the inner recess 710.

First, a guide wall 740 is formed between the inner recess 710 and the outer recess 720. A coolant introduction groove 741 is formed across the tip of the guide wall 740. Accordingly, the coolant of the outer recess 720 naturally flows into the inner recess 710 through the coolant introduction groove 741 of the guide wall 740.

Alternatively, as shown in FIG. 4, a coolant introduction hole 742 may be formed on a side surface of the guide wall 740 to introduce the coolant in the outer recess 720 into the inner recess 710. .

The coolant introduction groove 741 or the coolant introduction hole 742 may be formed to be inclined along the circumferential direction of movement of the coolant. In this way, the coolant can be naturally introduced along the tangential direction of the circumference (strictly slightly inclined with respect to the tangent) from the outer circumference recess 720 to the inner recess 710, thereby giving a great centrifugal force to the coolant. It becomes possible.

Furthermore, when viewed from the axial direction, the inlet 741a of the coolant introduction groove 741 or the inlet of the coolant introduction hole 742 is formed in a smooth curve (curvature radius = R). Introduction is possible.

In addition, the inlet 741a of the coolant introduction groove 741 or the inlet of the coolant introduction hole 742 may have the widest shape so that the coolant flows smoothly.

In addition, when viewed from the axial direction, if the guide wall 740 is circular, it is possible to introduce a smoother refrigerant.

In the drawing, the coolant introduction groove 741 or the coolant introduction hole 742 is shown as a single along the circumferential direction of the guide wall 740, but it is also possible to form two or more.

On the other hand, the center of the inner recess 710 may be somewhat eccentric with respect to the center of the gas outlet (711). This is because the oil separation function is maximized because the width of the refrigerant passage varies by eccentricity.

In addition, since the pressure increases in a wide area of the refrigerant passage, the formation of the refrigerant introduction grooves 741 in this portion makes it possible to introduce the refrigerant more smoothly.

Of course, even if the center of the inner recess 710 coincides with the center of the outer recess 720, oil separation by centrifugal force is possible.

On the other hand, the gas outlet 711 may be formed to protrude toward the valve device 300 from the bottom of the inner recess 710. In this manner, the separated minute amount of oil may be prevented from being discharged together with the refrigerant gas through the gas outlet 711 by riding on the bottom of the inner recess 710.

In addition, when viewed from the axial direction, the gas outlet 711 is formed in a circular shape so as not to impede the centrifugal force to the refrigerant.

Next, with reference to Figure 3 will be briefly described the operation of the compressor is installed integral housing housing oil separation structure according to the present invention.

First, when the compressor 1000 is operated, the pulley P connected to the engine (not shown) rotates, and the drive shaft 140 installed in the pulley P rotates.

As the drive shaft 140 rotates, the swash plate 150 rotates in a variable inclination, and the piston 200 performs a compression action while sliding by the swash plate 150.

That is, the refrigerant introduced through the inlet 331 of the valve device 300 is compressed in the cylinder bore 110a by the piston 200, and the compressed refrigerant is discharged through the outlet 332 of the valve device 300. It is introduced into the outer recess 710 of the oil separation structure integrated rear housing 130.

Subsequently, the refrigerant is introduced into the inner circumferential recess 720 from the outer circumferential recess 710 through the coolant introduction groove 741 formed in the guide wall 740, and the centrifugal force is applied to the coolant.

At this time, the oil having a high density accumulates at the bottom of the side of the inner recess 710 outside the gas outlet 711 and is continuously directed to the control valve 800 through the oil outlet 730.

The oil through the control valve 800 is supplied to each part through the swash plate chamber 120a or the drive shaft 140 by the oil pump 910.

The above arrangement represents only one embodiment and may be applied by one skilled in the art to other general reciprocating compressors including pistons, cylinder blocks, piston drive means, housings and valve arrangements in addition to swash plate compressors.

According to the configuration of the present invention as described above, by separating the oil from the refrigerant flowing into the discharge chamber it is possible to increase the efficiency of the compressor and to maintain durability.

In addition, according to the present invention, by integrating the oil separation structure in the housing, there is no need for a separate part for oil separation, and it is easy to process, thereby reducing the production cost.

Further, according to the present invention, the introduction of the coolant can be smoothly provided by providing the coolant introduction groove or the coolant introduction hole in the tip or side of the guide wall.

Further, according to the present invention, the configuration of the coolant introduction groove and the coolant introduction hole can be specified to facilitate the introduction of the coolant.

Further, according to the present invention, the center of the inner recess is eccentric with respect to the center of the gas outlet so as to provide a pressure difference to facilitate the introduction of the refrigerant through the coolant introduction groove or the coolant introduction hole.

In addition, according to the present invention, by forming the gas outlet port to protrude toward the valve from the bottom of the inner recess it is possible to prevent some oil is discharged with the refrigerant gas after oil separation.

Claims (13)

A housing having a suction chamber and a discharge chamber, a cylinder block having a plurality of cylinder bores and coupled to the housing, a piston accommodated reciprocally in the cylinder bore, piston driving means for driving the piston, and In the housing of the reciprocating compressor provided with a valve device provided opposite the bottom of the piston and in communication with the suction chamber and the discharge chamber formed with a suction port, An internal recess having a gas outlet at the bottom thereof; An outer circumferential recess formed along a circumference of the inner recess and communicating with the discharge chamber; An oil outlet communicating with the circulation path from the inner recess; And the discharge chamber is disposed closer to the center side of the suction chamber than the suction chamber. The method of claim 1, The inner recess is separated from the outer recess by a guide wall, and the inner recess and the outer recess communicate with each other by a refrigerant introduction groove formed at the tip of the guide wall. housing. The method of claim 2, The refrigerant introduction groove is oil-separated structure integrated housing of the reciprocating compressor, characterized in that formed inclined along the direction of movement of the refrigerant. The method of claim 3, When viewed from the axial direction, the inlet of the refrigerant introduction groove is oil-separated structure integrated housing of the reciprocating compressor, characterized in that formed in a smooth curve. The method of claim 1, The inner recess is separated from the outer recess by a guide wall, and the inner recess and the outer recess communicate with each other by a refrigerant introduction hole formed in a side surface of the guide wall. housing. The method of claim 5, The refrigerant introduction hole of the oil separation structure integrated housing of the reciprocating compressor, characterized in that formed inclined along the direction of movement of the refrigerant. The method of claim 6, When viewed from the axial direction, the inlet of the refrigerant introduction groove is oil-separated structure integrated housing of the reciprocating compressor, characterized in that formed in a smooth curve. The method according to any one of claims 1 to 7, And the gas outlet is formed to protrude toward the valve from the bottom of the inner recess. The method of claim 8, When viewed from the axial direction, the outer wall of the guide wall is an oil-separated structure integrated housing of the reciprocating compressor, characterized in that the circular shape. The method of claim 8, And the center of the inner recess is eccentric with respect to the center of the gas outlet. The method of claim 10, An oil-separated structure integrated housing of a reciprocating compressor, characterized in that an inlet of a coolant introduction groove or a coolant introduction hole is formed in a wide portion of the outer circumferential recess. The method of claim 8, And the center of the inner recess coincides with the center of the outer recess. The method of claim 12, When viewed from the axial direction, the gas outlet is an oil-separated structure integrated housing of the reciprocating compressor, characterized in that formed in a circular shape.

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