JP2012102741A - Compressor with oil separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor with an oil separator in which a separating pipe can be accurately press fitted.SOLUTION: The compressor includes a compression mechanism, a cylindrical housing for storing the compression mechanism, a discharge passage formed in the housing and discharging gas discharged from the compression mechanism to the outside of the housing, and a centrifugal oil separator arranged in the middle of the discharge passage. The oil separator includes an oil separation chamber 18 forming part of the discharge passage and the separation pipe 21 press fitted and fixed to the oil separation chamber, and a flat surface 23 perpendicular to the press-fitting direction of the separation pipe is formed on a housing outside surface on the press-fitting direction side of the separation pipe. The press-fitting direction of the separation pipe is radially inward toward a central axial line of a cylindrical shape. The cylindrical outer shape of the housing is cast-molded using a pair of molds having cavities of a hemi-cylindrical shape. The press-fitting direction of the separation pipe is tilted relative to a sliding direction of the pair of molds.

Description

  The present invention relates to a compression mechanism and a compressor with an oil separator.

A compression mechanism, a housing that houses the compression mechanism, a discharge passage that is formed in the housing and discharges gas discharged from the compression mechanism to the outside of the housing, and a centrifugal oil separator disposed in the middle of the discharge passage An oil separator equipped with an oil separator having an oil separation chamber that forms part of a discharge passage and a separation pipe that is press-fitted and fixed in the oil separation chamber is disclosed in Patent Document 1 and the like.
JP 2001-295767 A

The conventional compressor with an oil separator has a problem that the housing becomes unstable when the separation pipe is press-fitted and the separation pipe cannot be press-fitted with high accuracy.
The present invention has been made in view of the above problems, and an object thereof is to provide a compressor with an oil separator capable of accurately press-fitting a separation pipe.

In order to solve the above problems, in the present invention, a compression mechanism, a cylindrical housing that houses the compression mechanism, a discharge passage that is formed in the housing and discharges gas discharged from the compression mechanism to the outside of the housing, and a discharge passage An oil separator having a centrifugal separation system disposed in the middle of the oil separator, the oil separator having an oil separation chamber forming a part of a discharge passage and a separation pipe press-fitted and fixed in the oil separation chamber. A flat surface orthogonal to the separation pipe press-fitting direction is formed on the outer surface of the housing on the direction side, and the press-fitting direction of the separation pipe is radially inward toward the central axis of the cylinder, and the cylindrical outer shape of the housing is Casting is performed using a pair of molds having a semi-cylindrical cavity, the press-fitting direction of the separation pipe is inclined with respect to the sliding direction of the pair of molds, Serial flat surface provides with oil separator compressor, characterized in that by using the draft of the pair of molds at the time of casting the cylindrical housing is cast formed.
In the present invention, since the flat surface orthogonal to the separation pipe press-fitting direction is formed on the outer surface of the housing on the separation pipe press-fitting direction side as the flat surface receiving portion when the separation pipe is press-fitted, the separation pipe can be press-fitted with high accuracy.
In the present invention, the housing is cylindrical and the cylindrical housing is generally cast. The press-in direction of the separation pipe is radially inward toward the central axis of the cylinder, and the cylindrical outer shape of the housing is cast using a pair of molds having a semi-columnar cavity. When the press-fitting direction is inclined with respect to the sliding direction of the pair of molds, the flat surface is formed by one of the pair of molds. In this case, it is desirable to cast and form the flat surface using the draft angle of the one mold.

In the present invention, since the flat surface orthogonal to the separation pipe press-fitting direction is formed on the outer surface of the housing on the separation pipe press-fitting direction side as the flat surface receiving portion when the separation pipe is press-fitted, the separation pipe can be press-fitted with high accuracy.

A compressor with an oil separator according to an embodiment of the present invention will be described.
As shown in FIG. 1, the scroll compressor A includes a fixed scroll 1 having an end plate 1a and a spiral body 1b, and a movable scroll 2 having an end plate 2a and a spiral body 2b. The spiral bodies 1b and 2b mesh with each other to form a plurality of pairs of working spaces 3.
The scroll compressor includes a bottomed cylindrical casing 4a and a front housing 4b. The casing 4a and the front housing 4b are joined together to form a cylindrical housing 4 having a central axis X. The housing 4 accommodates the fixed scroll 1 and the movable scroll 2.
The end plate 1a of the fixed scroll is fitted and fixed to the casing 4a. An O-ring that seals the fitting fixing portion is provided. A suction chamber 5 and a discharge chamber 6 are formed in the housing 4 with the end plate 1a as a boundary.
A discharge hole 1c is formed at the center of the end plate 1a of the fixed scroll. The discharge hole 1c communicates with the discharge chamber 6 through a discharge valve attached to the end plate 1a.
The suction chamber 5 communicates with a suction port (not shown) formed in the front housing 4b. The suction port is connected to the low-pressure circuit of the air conditioner.
The discharge chamber 6 communicates with a discharge port 7 (see FIG. 2) formed in the casing 4a. The discharge port 7 is connected to the high voltage side circuit of the air conditioner.

A main shaft 8 is disposed in the suction chamber 5. The main shaft 8 is rotatably supported by the front housing 4b via radial bearings 9 and 10. One end of the main shaft 8 passes through the front housing 4b and extends outside the housing.
An electromagnetic clutch 11 is rotatably supported on the front housing 4b via a radial bearing 12.
An eccentric pin 13 is fixed to the other end of the main shaft 8. A bush 14 is slidably fitted on the eccentric pin 13. The bush 14 is accommodated in a boss 2 c formed on the back surface of the end plate 2 a of the movable scroll 2 via a radial bearing 15.
A ball coupling 16 is disposed between the movable scroll 2 and the front housing 4b.
The main shaft 8, the eccentric pin 13, the bush 14, the ball coupling 16, the movable scroll 2, and the fixed scroll 1 form a compression mechanism. The compression mechanism is accommodated in the housing 4.

As shown in FIGS. 1 and 2, a straight columnar oil separation chamber 18 is formed in the casing 4 a so as to communicate with the discharge chamber 6 through the discharge gas inlet 17 and with the discharge port 7. The central axis Y of the oil separation chamber 18 is orthogonal to the central axis X. One end of the oil separation chamber 18 is in the vicinity of the center axis X, and the other end is connected to a guide hole 19 for drilling an oil separation chamber that opens on the outer peripheral surface of the casing 4a. The guide hole 19 communicates with the discharge port 7. The guide hole 19 is opened on the outer peripheral surface of the casing 4 a, and the opening is closed by a lid member 20. The discharge chamber 6, the discharge gas introduction port 17, the oil separation chamber 18, the guide hole 19, and the discharge port 7 form a discharge passage that discharges the gas discharged from the compression mechanism to the outside of the housing 4.
A separation pipe 21 is disposed in the oil separation chamber 18, coaxially with the oil separation chamber 18, and spaced from the peripheral side wall of the oil separation chamber 18 with an annular gap 18 a. One end of the separation pipe 21 is in the vicinity of the center axis X, and the other end is press-fitted and fixed to the other end of the oil separation chamber 18. The discharge gas introduction port 17 is directed tangential to the annular gap 18a. A centrifugal oil separator 22 is formed by the discharge gas inlet 17, the annular gap 18 a and the separation pipe 21.

As shown by a thick arrow in FIG. 2, the press-fitting direction of the separation pipe 20 is radially inward toward the central axis X of the cylindrical casing 4a. A flat surface 23 that is orthogonal to the separation pipe press-fitting direction is formed opposite to 20.
The cylindrical outer shape of the casing 4a is formed by casting using a pair of dies having a semi-columnar cavity. As can be seen from FIG. 2, the press-fitting direction of the separation pipe 21 is inclined with respect to the mold slide direction. As a result, the flat surface 23 is formed by one of the two molds. Therefore, it is desirable to cast and form the flat surface 23 using the draft angle of the one mold. The flat surface 23 can be formed as it is without the need for cutting or grinding.

In the scroll compressor according to this embodiment, the power of a drive source (not shown) is transmitted to one end of the main shaft 8 via the electromagnetic clutch 11, and the main shaft 8 is rotationally driven. The rotation of the main shaft 8 is converted into a turning motion by the eccentric pin 13 and the bush 14 and transmitted to the movable scroll 2, and the movable scroll 2 turns. Refrigerant gas sucked into the suction chamber 5 through the suction port from the low-pressure side circuit of the air conditioner is taken into a pair of working spaces 3 on the outer peripheral side formed by the spiral bodies 1b and 2b. The ball coupling 16 prevents the movable scroll 2 from rotating.
The pair of working spaces 3 move toward the center of the fixed scroll 1 while reducing the volume, and the refrigerant gas in the working spaces 3 is compressed. A high-pressure refrigerant gas is discharged into the discharge chamber 6 through the discharge hole 1 c formed in the end plate 1 a of the fixed scroll 1 and the discharge valve. The high-pressure refrigerant gas flows from the discharge chamber 6 through the discharge gas introduction port 17 into the annular gap 18a of the oil separation chamber 18 in the tangential direction, and turns to the one end of the separation pipe 21 while turning in the annular gap 18a. Flows into the separation pipe 21 and flows out from the other end of the separation pipe 21 through the guide hole 19 and the discharge port 7 to the high-pressure side circuit of the air conditioner.

When the high-pressure refrigerant gas flows toward the one end of the separation pipe 21 while turning in the annular gap 18a, the oil mist dispersed and suspended in the refrigerant gas by the centrifugal force is separated from the refrigerant gas, and the oil separation chamber 18 It adheres to the peripheral side wall. The oil mist adhering to the peripheral side wall of the oil separation chamber 18 flows toward the bottom of the oil separation chamber 18 while forming droplets, and is accumulated at the bottom of the oil separation chamber 18. The oil accumulated at the bottom of the oil separation chamber 18 is returned to the suction chamber 5 through an oil passage (not shown) and lubricates various sliding portions of the compression mechanism.

In the scroll compressor A according to the present embodiment, the flat surface 23 perpendicular to the separation pipe press-fitting direction is formed on the outer surface of the casing peripheral wall on the separation pipe press-fitting direction as the plane receiving portion when the separation pipe is pressed. By performing the press-fitting operation in a state where the flat surface 23 is in contact with the flat upper surface, the separation pipe 21 can be pressed into the oil separation chamber 18 with high accuracy.

  The present invention can be widely used not only for scroll type compressors but also for various types of compressors equipped with centrifugal oil separators.

It is sectional drawing of the compressor which concerns on the Example of this invention. It is an II-II arrow line view of FIG.

DESCRIPTION OF SYMBOLS 1 Fixed scroll 1a End plate 1b Spiral body 1c Discharge hole 2 Movable scroll 2a End plate 2b Spiral body 4 Housing 5 Suction chamber 6 Discharge chamber 18 Oil separation chamber 18a Annular gap 21 Separation pipe 23 Flat surface

Claims (1)

A compression mechanism; a cylindrical housing that houses the compression mechanism; a discharge passage that is formed in the housing and discharges gas discharged from the compression mechanism to the outside of the housing; and a centrifugal oil separator disposed in the middle of the discharge passage The oil separator has an oil separation chamber forming a part of the discharge passage and a separation pipe press-fitted and fixed in the oil separation chamber. The oil separator is orthogonal to the separation pipe press-fitting direction on the outer surface of the housing on the separation pipe press-fitting direction side. A flat surface is formed, the press-in direction of the separation pipe is radially inward toward the central axis of the cylinder, and the cylindrical outer shape of the housing is a pair of molds having a semi-columnar cavity. The separating pipe is press-fitted in an inclining direction with respect to the sliding direction of the pair of molds, and the flat surface is formed when the cylindrical housing is cast. Compressor with an oil separator, characterized in that the serial is cast formed utilizing the draft of the pair of molds.

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