JP2001099080A - Closed scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a shortage of the lubricating oil while preventing the carry-away of the lubricating oil by the refrigerant gas in a closed scroll compressor. SOLUTION: A closed scroll compressor 40 has a scroll compressing mechanism C having a fixed scroll 9 provided over an inner space of a closed housing 3 and a turning scroll 11, an electric motor 5 for driving the scroll compressing mechanism C, and a lubricating oil reservoir 43 formed in a bottom part inside the housing 3. A separating distributor plate 60 is provided in the inner space 3 so as to face to a refrigerant gas suction pipe 31, and the separating distributor plate 60 is formed so as to distribute the refrigerant gas A into three directions or more, and the refrigerant gas including the lubricating oil abuts on the separating distributor plate 60, and the lubricating oil falls downward, and the refrigerant gas directs the scroll compressing mechanism C, and furthermore, the electric motor 5 is cooled by the refrigerant gas passing a through hole of a separating distributor plate 60.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic scroll compressor, and more particularly, to an internal structure of a hermetic scroll compressor for promoting separation of lubricating oil contained in refrigerant gas sucked into a compression section.

[0002]

2. Description of the Related Art An example of a conventional hermetic scroll compressor is shown in a longitudinal sectional view of FIG. The structure of the hermetic scroll compressor 1 will be briefly described below. A scroll compression mechanism is provided above the hermetic housing 3 and an electric motor 5 is provided below the hermetic housing 3. I have. The scroll compression mechanism includes a fixed scroll 9, an orbiting scroll 11, an Oldham ring 13 that allows the orbiting scroll 11 to perform a revolving orbiting motion but prevents its rotation, a frame 15 to which the fixed scroll 9 is fixed, and the like. The fixed scroll 9 has an end plate 17.
And a spiral wrap 19 erected on the inner surface thereof.
A discharge port 21 and a discharge valve 23 for opening and closing the discharge port 21 are provided at the center of the end plate 17. On the other hand, orbiting scroll 1
1 is formed of an end plate 25, a spiral wrap 27 standing upright on the inner surface thereof, and a boss 29 protruding from the center of the outer surface of the end plate 25. The upper end of the rotary shaft 7 is rotatably inserted into the boss 29, and the orbiting scroll 11 is rotated or rotated by the rotary shaft 7.

When the electric motor 5 is driven, the rotary shaft 7 fixed to the rotor is driven to rotate, and the orbiting scroll 11 is driven via the eccentric drive pin at the upper end. The orbiting scroll 11 revolves orbiting while its rotation is prevented by the Oldham ring 13. In this case, the scroll compression mechanism performs a suction compression movement,
The refrigerant gas enters the internal space 33 via the suction pipe 31 and is sucked into the closed space between the fixed scroll 9 and the orbiting scroll 11, and then compressed and exits through the discharge port 21, and finally discharges It is discharged to the outside via the pipe 35.
At the same time, the rotating shaft 7 sucks up the lubricating oil from the oil pool at the lower portion inside the housing 3 by the rotation thereof, and supplies the lubricating oil to the bearings of each part to perform necessary lubrication.

[0004]

However, in the above-described conventional hermetic scroll compressor 1, since a large amount of lubricating oil is floating in the internal space 33 in the hermetic housing 3, the refrigerant gas is not lubricated. The oil is sucked into the scroll compression mechanism with the wake, and is discharged to the outside via the discharge pipe 35. For this reason, the amount of the lubricating oil in the inner bottom portion of the housing 3 is reduced, which hinders the suction of the lubricating oil by the rotating shaft 7 and has a problem in that the sliding portion has poor lubrication. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a hermetic scroll compressor capable of effectively preventing floating lubricating oil from flowing into a scroll compression mechanism due to refrigerant gas and preventing a decrease in liquid lubricating oil.

[0005]

According to the present invention, there is provided a closed housing, a scroll compression mechanism provided above a space inside the closed housing and having a fixed scroll and an orbiting scroll. An electric motor provided below the housing to drive the scroll compression mechanism, and a hermetic scroll compressor having a lubricating oil reservoir formed at a bottom portion in the hermetic housing, wherein the hermetic housing is provided in the internal space. A separation / distribution plate is provided facing the refrigerant gas suction pipe, and the separation / distribution plate is configured to distribute the refrigerant gas flowing from the suction pipe in three or more directions. The lubricating oil hits the plate and falls down, and the refrigerant gas goes to the scroll compression mechanism installed above, and further from the opening of the separation / distribution plate. The electric motor is configured to be cooled by the refrigerant flowing into the gas. And in a preferred embodiment, the separation and distribution plate has one or more gas passage holes for cooling the electric motor. Further, an open portion below the separation / distribution plate is formed as a passage between the electric motor and the closed housing ゛ for allowing lubricating oil contained in the refrigerant gas to fall between the electric motor and the closed housing ゛. Is preferred.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same parts are denoted by the same reference numerals throughout the drawings, including the drawings related to the above-described conventional apparatus. First, referring to FIG. 1, a scroll compression mechanism C is provided above the internal space 33 of the sealed housing 3 of the scroll compressor 40, and an electric motor 5 is provided below the scroll compression mechanism C. The scroll compression mechanism C includes a fixed scroll 9, an orbiting scroll 11, and an orbiting scroll 11
And a frame 15 to which the fixed scroll 9 is fixed. The fixed scroll 9 includes an end plate 17 and a spiral wrap 19 erected on the lower inner surface. A discharge port 21 and a discharge valve 23 for opening and closing the discharge port 21 are provided in the center of the end plate 17. On the other hand, the orbiting scroll 11 is formed by an end plate 25, a spiral wrap 27 erected on the inner surface of the end plate 25, and a boss 29 formed to protrude from the center of the lower surface (in the figure) of the end plate 25.

The upper part of the rotating shaft 7 fixed to the rotor of the electric motor 5 has a main bearing 41 fixed to the frame 15.
The lower part is rotatably supported by a sub bearing 45 in a lubricating oil reservoir 43 formed at the bottom of the closed housing 3. Thus, the rotating shaft 7 is rotated by the electric motor 5. Further, the upper end of the rotary shaft 7 is an eccentric drive pin 46, which is inserted into the boss 29 of the scroll compression mechanism C, and the drive bush 47 is fitted therein, and the boss 2
It is slidably in contact with a swivel bearing 49 fixed to the 9 side. Therefore, the rotation torque of the rotation shaft 7 is transmitted to the orbiting scroll 11 via the drive bush 47 and the orbit bearing 49. Further, the main bearing 4 is attached to the rotating shaft 7 from the lower end.
An oil absorption hole 51 is formed to reach the drive bush 1 and the drive bush 47, and an inlet hole 55 is also formed in a support plate 53 that supports the lower end thereof. Thus, the rotating shaft 7
Rotates and drives the orbiting scroll 11,
Lubricating oil is sucked up from the lubricating oil reservoir 43 through the inlet hole 55 and the oil absorbing hole 51, and supplied to the sub bearing 45, the main bearing 41, and the turning bearing 49. An oil sump chamber 57 is formed on the upper side of the frame 15 adjacent to the boss 29 to receive the lubricating oil sent as described above. The oil is returned to the pool 43.

Further, a suction pipe 31 is attached to the side of the sealed housing 3 so that the refrigerant gas enters the internal space 33. A distribution plate 60 is vertically provided. on the other hand,
A discharge cavity 71 is formed above the discharge valve 23,
This communicates with the discharge pipe 35. FIG.
A shape of 0 is shown. As shown in FIG.
0 has a curved portion 61 forming a fluid guide path and a relatively small through hole 63 facing the suction pipe 31.

The scroll compressor 40 having the above structure
When the electric motor 5 is driven, the rotational torque is applied to the rotating shaft 7, the eccentric drive pin 46, the drive bush 4,
The orbiting scroll 11 is transmitted to the orbiting scroll 11 via the orbiting bearing 49, and the orbiting scroll 11 makes a revolving orbiting motion while its rotation is prevented by the Oldham ring 13. The scroll compression mechanism C causes a suction and a compression action by the movement of the orbiting scroll 11. In response to this, the refrigerant gas A flows into the internal space 33 through the suction pipe 31.
The refrigerant gas A flowing from the suction pipe 82 is
And is separated into lubricating oil and refrigerant gas. The separated refrigerant gas passes through the suction gas passage 73 and the scroll compression mechanism C
To the suction cavity 75. On the other hand, the separated lubricating oil passes through the gap between the electric motor 5 and the sealed housing 3 downward and falls into the lubricating oil sump 43. A part of the refrigerant gas containing the lubricating oil flows around the electric motor 5 through the through-hole 63 to cool it, and this refrigerant gas also finally goes to the suction cavity 75.

As described above, the suction cavities 75 are formed around the spiral wrap 19 of the fixed scroll 9 and the spiral wrap 27 of the orbiting scroll 11 by flowing upward through the suction gas passage 73 by colliding with the separation / distribution plate 60. The refrigerant gas that has entered the fixed scroll 9 and the orbiting scroll 11
Is sucked into a limited number of enclosed spaces created by the engagement of And the orbiting scroll 11
Due to the revolving motion of the closed space, the volume of the sealed space is reduced and reaches the central portion while being compressed. From here, the discharge valve 23 is pushed up through the discharge port 21 to the discharge cavity 71 formed on the back side of the end plate 17. Discharged, discharge pipe 35
Is discharged to the outside. The same applies to the refrigerant gas used for cooling the electric motor 5 described above.

On the other hand, the rotary shaft 7 rotated by the electric motor 5 sucks lubricating oil from the oil reservoir 43 at the bottom of the sealed housing 3 through the inlet hole 55 by a pump action, passes through the oil absorbing hole 51, and the sub bearing 45, Main bearing 41,
After lubricating the drive bush 47 and the like, the oil sump chamber 57
And is discharged toward the bottom of the sealed housing 3 through the oil drain hole 59, but a part of the water is mixed with the refrigerant gas for cooling the electric motor 5. Further, the lubricating oil flowing out from below the main bearing 41 is mixed with the refrigerant gas for cooling the electric motor 5. However, since the refrigerant gas for cooling the electric motor 5 flows through the through-hole 63 of the above-described separation / distribution plate 60, the amount of the lubricating oil mixed is considerably smaller than in the conventional case.

[0012]

As described above, according to the present invention, most of the refrigerant gas flowing from the suction pipe collides with the separation / distribution plate and is separated into lubricating oil and refrigerant gas, and the lubricating oil is returned to the lubricating oil reservoir. . Further, since the amount of the refrigerant gas for cooling the motor through the through hole of the separation / distribution plate is limited, the amount of the lubricating oil to be mixed is small. Therefore, the amount of lubricating oil taken out of the sealed housing is greatly reduced, and seizure due to poor lubrication of each bearing of the compressor can be prevented.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a hermetic scroll compressor according to an embodiment of the present invention.

FIG. 2 is a partial perspective view showing a main part of the embodiment.

FIG. 3 is a vertical sectional view of a conventional hermetic scroll compressor.

[Explanation of symbols]

 Reference Signs List 3 Hermetic housing 5 Electric motor 7 Rotating shaft 9 Fixed scroll 11 Orbiting scroll 13 Oldham ring 15 Frame 17 End plate 19 Lapp 21 Discharge port 23 Discharge valve 25 End plate 27 Lapp 29 Boss 31 Suction pipe 33 Internal space 35 Discharge pipe 40 Scroll 41 Main bearing 43 Lubricating oil reservoir 45 Sub-bearing 46 Eccentric drive pin 47 Drive bush 49 Slewing bearing 51 Oil absorption hole 53 Support plate 55 Inlet hole 57 Drainage storage chamber 59 Drainage hole 60 Separation distribution plate 61 Curved portion 63 Through hole 71 Discharge cavity 73 suction gas passage 75 suction cavity A refrigerant gas C scroll compression mechanism

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroaki Bito 3-1-1 Asahicho, Nishibiwashima-cho, Nishi-Kasugai-gun, Aichi Prefecture F-term in Air Conditioning Works, Mitsubishi Heavy Industries, Ltd. CC48 3H039 AA03 AA04 AA12 BB13 BB16 CC28 CC32 CC33 CC47

Claims (3)

[Claims] 1. A closed housing, a scroll compression mechanism provided above the internal space of the closed housing and having a fixed scroll and an orbiting scroll, an electric motor provided below the closed housing and driving the scroll compression mechanism, and In a hermetic scroll compressor having a lubricating oil reservoir formed at a bottom portion in the hermetic housing,
A separation / distribution plate is provided in the interior space facing the refrigerant gas suction pipe of the closed housing, and the separation / distribution plate is configured to distribute the refrigerant gas flowing from the suction pipe in three or more directions. The oil-containing refrigerant gas hits the separation / distribution plate, the lubricating oil falls downward, the refrigerant gas goes to the scroll compression mechanism installed above, and the electric motor is driven by the refrigerant gas flowing from the opening of the separation / distribution plate. A hermetic scroll compressor, wherein the hermetic scroll compressor is configured to be cooled. 2. The hermetic scroll compressor according to claim 1, wherein one or more gas passage holes are formed in the separation / distribution plate for cooling the electric motor. 3. An open portion below the separation / distribution plate is provided between the electric motor and the closed housing ゛, and a passage through which lubricating oil contained in the refrigerant gas falls between the electric motor and the closed housing ゛. The hermetic scroll compressor according to claim 1, wherein the hermetic scroll compressor is formed as: