JPH0932743A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the accumulation of lubricating oil in a lower section of a discharge chamber by providing a discharge port for discharging compressed gas in the discharge chamber to the outside in a housing in such a manner that it is positioned in the lower section of the discharge chamber. SOLUTION: Gas compressed in a compression chamber 24 is discharged into a discharge chamber 46 through a discharge port 13. The compressed gas collides against a discharge valve 17 and turns its direction in the discharge chamber 46 so that mist of lubricating oil which is contained in the compressed gas is separated from the compressed gas and drops in a lower section of the discharge chamber 46. The lubricating oil is discharged to the outside together with the compressed gas which is discharged to the outside through a discharge port 45 positioned in the lower section of the discharge chamber 46, and is not accumulated in the lower section of the discharge chamber 46.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a scroll compressor incorporated in an air conditioner or the like.

[0002]

2. Description of the Related Art One example of a conventional scroll compressor is shown in FIG. In FIG. 2, reference numeral 4 denotes a housing, which includes a cup-shaped right housing 49, a frame 5, and a cup-shaped left housing 43, which are fastened together by bolts 56. An electric motor M is provided inside the right housing 49, and a scroll compression mechanism C is provided inside the left housing 43.

The electric motor M and the scroll type compression mechanism C are interlockingly connected to each other via a rotary shaft 3. The right end of the rotary shaft 3 is supported by the right housing 49 via a sub bearing 51, and the left end is supported by the frame 5 via a main bearing 52.

The electric motor M includes a rotor Ma and a stator Mb.
And the rotor Ma is fixed to the rotary shaft 3,
The stator Mb is fixed by being pressed into the right housing 49.

The scroll type compression mechanism C comprises a fixed scroll 1, an orbiting scroll 2, an Oldham link 6 for preventing the orbiting scroll 2 from rotating.

The fixed scroll 1 is provided with an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11. Is divided into low pressure side and high pressure side, and end plate 11
A discharge chamber 46 is formed on the left side and a suction chamber 47 is limited on the right side.

A discharge port 13 is formed in the center of the end plate 11, and the discharge port 13 is opened and closed by a discharge valve 17. The fixed scroll 1 is fastened to the left housing 43 by screwing a bolt 57 into the protrusion 15 protruding leftward from the outer surface of the end plate 11.

The orbiting scroll 2 is provided with an end plate 21 and a spiral wrap 22 which is erected on the inner surface of the end plate 21, and a drive bush 32 is provided in the orbiting bearing in a boss 23 which is erected on the center of the outer surface of the end plate 21. It is rotatably fitted through 34. An eccentric drive pin 31 eccentrically provided at the left end of the rotary shaft 3 is slidably fitted in a slide groove 33 formed in the drive bush 32.

An Oldham link 6 is interposed between the end plate 21 and the frame 5, and the outer surface of the end plate 21 is a thrust bearing.
Sliding contact with the left end surface of the frame 5 via 53.

A plurality of closed spaces 24 are formed by eccentric the fixed scroll 1 and the orbiting scroll 2 with respect to each other by a predetermined distance and meshing them by shifting the angle by 180 degrees.

When the electric motor M is driven, the rotary shaft 3, the eccentric drive pin 31, the drive bush 32, and the slewing bearing 3 are driven.
The orbiting scroll 2 is driven via an orbiting drive mechanism including a boss 23, and the orbiting scroll 2 revolves on a circular orbit having an orbiting radius while being prevented from rotating by the Oldham link 6.

Then, a low-temperature refrigerant gas containing mist-like lubricating oil enters the low-pressure chamber 48 via the suction port 44, and this gas passes through a passage 58 provided on the outer periphery of the stator Mb and the stator Mb.
After cooling the electric motor M while passing through the gap 59 between the rotor Ma and the rotor Ma, the passage 54 and the suction chamber 47 provided in the frame 5 are provided.
Is sucked into the closed space 24 through.

As the volume of the closed space 24 decreases due to the orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, and passes through the discharge port 13 from the central portion.
The discharge valve 17 is pushed open to be discharged into the discharge chamber 46, and then discharged to the outside through the discharge port 45.

[0014]

In the conventional scroll compressor described above, the gas compressed by the scroll compression mechanism C collides with the discharge valve 17 when discharged from the discharge port 13 into the discharge chamber 46. The mist of the lubricating oil contained in the compressed gas is separated, and the mist of the lubricating oil is further separated by turning the direction in the discharge chamber 46. There was a problem that a large amount of lubricating oil accumulated in the lower part.

When a large amount of lubricating oil accumulates in the discharge chamber 46, the mist of lubricating oil contained in the gas sucked into the housing 4 decreases, and the sliding portion lubricated by this mist, That is, bearings 51 and 52, slewing bearing
34, the thrust bearing 53, the eccentric drive pin 31, the Oldham link 6, the lubrication failure such as the meshing surface between the fixed scroll 1 and the orbiting scroll 2, and the deterioration of the oil seal function.

[0016]

The present invention has been invented to solve the above problems, and is characterized in that a discharge port for discharging a compressed gas in a discharge chamber to the outside is provided. It is provided in the housing so as to be located in the lower part of the discharge chamber.

Therefore, the mist-like lubricating oil contained in the compressed gas discharged from the discharge port into the discharge chamber is discharged outside from the discharge port together with the compressed gas without being accumulated in the lower portion of the discharge chamber.

[0018]

DETAILED DESCRIPTION OF THE INVENTION One embodiment of the present invention is shown in FIG. As shown in FIG. 1, a discharge port 45 for discharging the compressed gas in the discharge chamber 46 to the outside is provided in the housing 4 so as to be located below the discharge chamber 46. The other configuration is the same as that of the conventional one shown in FIG. 2, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Thus, during operation of the scroll compressor, the gas compressed in the compression chamber 24 is discharged from the discharge port 13 into the discharge chamber 46, the compressed gas collides with the discharge valve 17, and
By changing the direction in the discharge chamber 46, the mist of the lubricating oil contained in the compressed gas is separated from the compressed gas and drops in the lower portion of the discharge chamber 46.

Since this lubricating oil is discharged to the outside along with the compressed gas discharged to the outside from the discharge port 45 located in the lower portion of the discharge chamber 46, it does not accumulate in the lower portion inside the discharge chamber 46.

[0021]

According to the present invention, since the discharge port for discharging the compressed gas in the discharge chamber to the outside is provided in the housing so as to be located in the lower part of the discharge chamber, it is included in the compressed gas discharged from the discharge port. The mist-like lubricating oil is discharged to the outside through the discharge port together with the compressed gas without being accumulated in the lower portion of the discharge chamber.

As a result, it is possible to prevent the mist of the lubricating oil in the gas returning into the housing from decreasing.
It is possible to sufficiently lubricate the scroll type compression mechanism and the like in the housing with the mist of lubricating oil.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional scroll compressor.

[Explanation of symbols]

 4 Housing C Scroll type compression mechanism 1 Fixed scroll 11 End plate 12 Spiral wrap 13 Discharge port 2 Orbiting scroll 21 End plate 22 Spiral wrap 46 Discharge chamber (high pressure side) 47 Suction chamber (low pressure side) 45 Discharge port

Claims (1)

[Claims] 1. A scroll type compression mechanism comprising a fixed scroll, an orbiting scroll and the like is housed and installed in a housing, and an end plate of the fixed scroll partitions the inside of the housing into a low pressure side and a high pressure side, and the high pressure side is described above. In a scroll compressor serving as a discharge chamber for compressed gas discharged from a discharge port provided on an end plate of a fixed scroll, a discharge port for discharging the compressed gas in the discharge chamber to the outside is located at a lower portion of the discharge chamber. A scroll compressor, which is provided in the housing as described above.