JP2897463B2 - Oil supply device for hermetic scroll compressor - Google Patents

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 a device for supplying oil to a bearing portion of a compressor.

[0002]

2. Description of the Related Art As described in Japanese Patent Application No. 1-271661, the oil supply structure of a conventional hermetic scroll compressor has no displacement relative to the drive shaft at the motor-side end of the drive shaft. Refueled through a fixed cover
Was. This cover has a sliding bearing that supports the drive shaft.
And, frame cover periphery by bolts passing through the electric motor
Was fixed to the system.

[0003]

THE INVENTION to be solved INVENTION because Tata have in the prior art is fixed to the frame by a long bolt passing through the motor cover peripheral portion, the electric motor needs through hole
And it was expensive and poor in assemblability. Further, since the cover is greatly inclined by the inclination of the end face of the frame, the gap between the bearings cannot be made uniform, and there is a problem that the bearing is burned. Also, when attaching the oil supply pipe to the cover,
Alignment is difficult, assembling property has been a bad casting.

The object of the present invention is based on the above-mentioned matters, and is inexpensive, has good assemblability, and has a sliding portion.
Closed scroll pressure for reliable and reliable lubrication
An object of the present invention is to provide an oil supply device for a contractor .

[0005]

In order to achieve the above object, an oil supply device for a hermetic scroll compressor according to the present invention comprises a base plate.
And a fixed scroll consisting of a spiral wrap integral with it
And orbiting scroll, and both wraps are meshed with each other
And rotate the orbiting scroll with respect to the fixed scroll
The anti-rotation mechanism that rotates without turning and the orbiting scroll
A drive shaft for pivoting drive, and a frame supporting the drive shaft.
Compression mechanism consisting of an arm and the like, and an electric motor for driving the compression mechanism
In a scroll compressor provided in a closed container,
Discharge piping between the discharge connection of the sealed container and the separate oil reservoir
And the end face of the oil reservoir and the drive shaft on the motor side
At least two spherical plain bearings in the lubrication hole provided near the part
Forming an oil passage communicating through a joint having a differential pressure
It is intended to be refueled .

[0006]

[0007]

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the overall structure of a hermetic scroll compressor embodying the present invention. In FIG. 1, a scroll compression mechanism 2 and an electric motor 3 for driving the scroll compression mechanism 2 are housed in an airtight container 1, and a lower portion is a space 4.
Scroll compression mechanism 2, the orbiting scroll 5, the fixed scroll 6, a drive shaft 7 which forms a crank shaft driven by the electric motor 3, the frame 8, which is from the rotation preventing mechanism 9.

The orbiting scroll 5 has a spiral wrap 5b on a base plate (end plate) 5a. A bearing 5c into which the crankpin 7a of the drive shaft 7 is inserted is provided on the back of the base plate 5a.
The pressure plate 5a is provided with a pressure equalizing hole 5d for communicating the space of the wrap 5b during compression with the back pressure chamber 8c.

Fixed scroll 6 fixed to frame 8
Also has a spiral wrap 6b on the base plate 6a.

In addition, a suction hole 6c is provided in the outer periphery of the wrap, and a discharge hole 6d is provided in the center of the wrap.

The frame 8 fixed to the container 1 has bearings 8a, 8a 'for supporting the drive shaft 7, a pedestal 8b for clamping the orbiting scroll 5 with the fixed scroll 6, and an appropriate pressing force to the orbiting scroll 5. There is provided a back pressure chamber 8c for giving.

The orbiting scroll 5 and the fixed scroll 6 are combined with the wraps 5b and 6b facing inward, and the orbiting scroll 5 is held between the fixed scroll 6 and the base 8b of the frame 8. A rotation prevention mechanism 9 for preventing the rotation of the orbiting scroll is provided between the rear surface of the orbiting scroll and the frame. The drive shaft 7 has a crankpin 7a whose one end is supported by the bearing 5c. Also in the drive shaft 7 is provided in the oil supply hole 7c is on heart during rotation of the shaft 7. One end of the oil supply hole 7c has a crank pin 7a.
And the other end penetrates to the end face on the side of the electric motor 3, and supplies oil to the bearings 8a and 8a 'via an oil supply hole 7f. A spherical plain bearing 10 is provided on the motor-side end face of the drive shaft 7. On the other hand, an oil supply pipe 15 is connected to the separate oil reservoir 11 at the lower end of the sealed container 1, and the oil supply pipe 15 communicates with the above-mentioned axial extension of the drive shaft 7. On the end face of the oil supply pipe 15, a spherical slide bearing 12 different from the above-described spherical slide bearing 10 is provided by a pedestal 16. An oil supply pipe joint 13 that connects the spherical bearings 10 and 12 is provided.

Next, the operation of the scroll compressor will be described.

When the drive shaft 7 is rotated by the electric motor 3, the orbiting scroll 5 orbits without rotating by the rotational movement of the crank pin 7a and the action of the rotation preventing mechanism 9. As a result, the orbiting scroll 5 and the fixed scroll 6
The space formed by the wraps 5b, 6b and the base plates 5a, 6a decreases in volume while moving to the center, compresses the gas sucked through the suction hole 6c, and discharges the gas through the discharge hole 6d. The discharged gas cools the electric motor 3 through the base plate 6a of the fixed scroll 6 and the passage 12 formed in the frame 8, and is then discharged from the discharge pipe 1c. When the scroll performs a compression action, a force acts to separate the orbiting scroll 5 and the fixed scroll 6 from acting. To prevent this, the pressure in the back pressure chamber 8c on the back of the orbiting scroll is increased by the pressure equalizing hole 5d. Is maintained at a pressure lower than the discharge pressure and higher than the suction pressure (intermediate pressure).

Thus, the end surfaces of the orbiting scroll bearing 5c and the frame bearing 8a 'on the back pressure chamber 8c side are maintained at the intermediate pressure. On the other hand, a discharge pipe 1c provided at a lower portion of the closed vessel 1 is connected to a separate oil reservoir 11 by a discharge pipe 14. The inside of the oil reservoir 11 has a structure in which the discharged refrigerant and the oil are separated, the oil is stored in a lower portion, and the refrigerant is guided from an upper portion to a refrigeration cycle. The lower part of the oil reservoir 11 and the spherical slide bearing 12 are in communication with each other by an oil supply pipe 15 via a pedestal 16. The oil reservoir 11 is in a discharge pressure state, and the oil is supplied from the oil reservoir 11 to the oil supply pipe 15. Through
Oil supply pipe joint 1 having spherical plain bearings 10 and 12 at both ends
3 to the oil supply hole 7 c of the drive shaft 7. The inside of the oil supply hole 7c is filled with oil at the discharge pressure.
Also, since the end surface of the bearing 8a 'of the frame 8 on the back pressure chamber 8c side has an intermediate pressure, each bearing is supplied to the sliding surface by the differential pressure between the discharge pressure and the intermediate pressure.

The lubricating pipe joint 12 and the spherical plain bearing 1
0 and 12 are respectively connected by a combination of press-fitting and clearance fit. In the case of clearance fit, a sliding bearing may be further provided in the spherical plain bearing to reduce the frictional force with the oil supply pipe joint 13. It is. The above-mentioned closed scroll compressor
According to the above, the oil supply hole 7c of the drive shaft 7 and the oil reservoir
Via a joint 13 having two spherical plain bearings 10,12
Can communicate with each other, can be simplified, and is inexpensive
Here, good assemblability can be obtained. This joint
The hand 13 has a mounting error perpendicular to the axial direction of the drive shaft 7.
Can be absorbed, and for mounting errors in the axial direction,
One of the lubrication pipe joints 13 is spherically slipped by clearance fit
Since it is slidable in the bearings 10 and 12, it can be absorbed.
You. Satisfies mounting errors in all directions in this way
Lubricating joint 13 can be used, and it can be securely connected to the sliding part of the compressor.
Thus, highly reliable lubrication becomes possible.

Although a single vertical compressor has been described above as an example, the present invention can be easily applied to a case where a plurality of horizontal compressors and a plurality of compressors are connected.

[0020]

As described above, the oil supply hole of the drive shaft and the oil reservoir can be communicated with each other through the joint having two spherical slide bearings , so that the structure can be simplified, and the cost can be reduced.
Thus, good assemblability can be obtained. This joint can absorb the mounting error in the direction perpendicular to the axial direction of the drive shaft, and for the axial mounting error, one of the lubrication pipe joints slides in the spherical plain bearing by a clearance fit. Since it is possible, it can be absorbed. In this way, a lubricating joint that satisfies mounting errors in all directions can be provided, and reliable and highly reliable lubrication can be performed on the sliding portion of the compressor.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a hermetic scroll compressor showing one embodiment of the present invention.

FIG. 2 is an oil supply system diagram of the compressor shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Closed container, 1c ... Discharge piping, 2 ... Scroll compression mechanism, 3 ... Electric motor, 4 ... Orbiting scroll, 6 ... Fixed scroll, 7 ... Drive shaft, 7c, 7f ... Oil supply hole, 8 ... Frame, 10 ... Spherical sliding Bearing, 11: Oil reservoir, 12: Spherical plain bearing, 13: Oil supply pipe joint, 14: Discharge pipe, 1
5. Oil supply piping.

Continuation of the front page (72) Inventor Mutsunori Matsunaga 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Inside the Shimizu Plant, Hitachi, Ltd. (56) References JP-A-3-134288 (JP, A) (58) Cl. ⁶ , DB name) F04C 18/02 311 F04C 29/02 311

Claims (1)

(57) [Claims] An anti-rotation mechanism in which a fixed scroll and an orbiting scroll, both of which are composed of a base plate and a spiral wrap integral therewith, are arranged in mesh with each other to rotate the orbiting scroll with respect to the fixed scroll without rotating. ,
In a scroll compressor including a drive shaft for orbitingly driving a orbiting scroll, a frame for supporting the drive shaft, and a motor for driving the same in a closed container, a discharge connection portion of the closed container is provided. and an oil reservoir that is separate and connected by a discharge pipe, and at least in the oil reservoir and the oil supply hole formed in the electric motor side end surface neighborhood of the drive shaft 2
An oil supply device for a hermetic scroll compressor, wherein an oil passage communicating with a joint having a plurality of spherical slide bearings is formed and oil is supplied with a differential pressure.