JPH051680A - Oil supply device for hermetic scroll compressor - Google Patents

Abstract

PURPOSE:To surely form an oil passage communicating the oil supply port of the motor side end face of a drive shaft with a separated oil reservoir at low cost by providing the oil passage which communicates the oil supply port within a drive shaft with the separated oil reservoir through an universal joint with spherical slide bearings formed at both the end face sides of the drive shaft. CONSTITUTION:The lower section of a separated oil reservoir 11 is communicated with a spherical slide bearing 12 by an oil supply pipe line 15 through a pedestal 16. And the oil reservoir 11 is in a condition capable of discharging pressure, and oil is introduced to the oil supply port 7c of a drive shaft 7 out of the oil reservoir 11 through the oil supply pipe line 15 and an oil supply pipe line joint 13 having spherical slide bearings 10 and 12 at both the ends of the joint. The inside of the oil supply port 7c is filled up with oil pressed by discharge pressure, oil is then supplied to the respective bearings by means of pressure difference between discharge pressure and intermediate pressure, because the end face at the back pressure chamber 8c side of the bearing 8a' between a turning scroll 5 and a frame 8 is made intermediate in pressure.

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 oil supply device for a bearing portion of a compressor.

[0002]

2. Description of the Related Art As described in Japanese Patent Application No. 1-271661, the conventional oil supply structure for a hermetic scroll compressor has no displacement relative to the drive shaft at the end of the drive shaft on the electric motor side. It was refueled from the fixed part.

[0003]

In the above prior art, a cover having a bearing for supporting the drive shaft is bolted to the end of the drive shaft on the electric motor side so that the drive shaft is not displaced relative to the drive shaft. Was fixed to the frame by. Further, since the bolt penetrates the electric motor, the electric motor needs a through hole. Further, since the cover is inclined due to the inclination of the end face of the electric motor, the gap between the bearings cannot be made uniform, and there is a problem that the bearing is burned. Moreover, when the oil supply pipe was attached to the cover, it was difficult to align the position, and the assemblability was poor.

The object of the present invention has been made based on the above-mentioned matters, and an oil passage for connecting the oil supply hole on the end face of the drive shaft on the electric motor side and the separate oil sump container are reliably formed at low cost. The purpose is to

[0005]

In order to achieve the above object, in an oil supply device for a hermetic scroll compressor of the present invention, a universal joint having spherical plain bearings at both ends is formed on the end face side of a drive shaft of an electric motor, An oil passage is formed which connects the oil supply hole provided in the drive shaft via this joint and a separate oil sump container.

[0006]

Operation: The separate oil sump container and the discharge gas in the compressor are connected by piping. Further, the oil accumulated in the separate oil sump container is guided to the closed container by piping and then to the spherical sliding bearing provided in the axial direction of the drive shaft in the lower part inside the closed container. On the other hand, another spherical plain bearing is provided on the end face portion of the drive shaft, one of the spherical plain bearings is press-fitted in the central part of the shaft, and the other is communicated by a pipe having a gap movable in the axial direction. In this way, the oil supply hole provided in the drive shaft and the oil sump container communicate with each other through joints having spherical plain bearings at both ends.

With this construction, the oil supply hole of the drive shaft and the oil reservoir can communicate with each other through a joint having two spherical plain bearings, and this joint is perpendicular to the axial direction of the drive shaft. The mounting error in the direction can be absorbed, and the mounting error in the axial direction can be absorbed because one of the oil supply pipe joints can slide in the spherical plain bearing by a clearance fit. In this way, it is possible to provide a lubrication joint that satisfies the mounting error in all directions, and reliably and reliably lubricate the sliding portion of the compressor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 space 4 is formed in the lower portion.
The scroll compression mechanism 2 includes an orbiting scroll 5, a fixed scroll 6, a drive shaft 7 forming a crank driven by an electric motor 3, a frame 8, and a 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 crank pin portion 7a of the drive shaft 7 is inserted is provided on the back surface of the base plate 5a.
Further, the base plate 5a is provided with a pressure equalizing hole 5d which communicates the space in the lap 5b being compressed with the back pressure chamber 8c.

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

A suction hole 6c is provided in the outer peripheral portion of the wrap, and a discharge hole 6d is provided in the central portion of the wrap.

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

The orbiting scroll 5 and the fixed scroll 6 are combined with each other with the wraps 5b, 6b facing inward, and the fixed scroll 6 and the pedestal 8b of the frame 8 hold the orbiting scroll 5 therebetween. A rotation prevention mechanism 9 for preventing rotation of the orbiting scroll is installed between the rear surface of the orbiting scroll and the frame. The drive shaft 7 has a crank pin 7a whose one end is supported by the bearing 5c. In the drive shaft 7, an oil supply hole 7c is provided on the rotation center of the shaft 7. One end of this oil supply hole 7c is a crank pin 7a.
Of the bearing 8a, 8a 'through the oil supply hole 7f while penetrating to the end surface of the electric motor 3 at the other end. A spherical plain bearing 10 is provided on the end surface of the drive shaft 7 on the electric motor side. On the other hand, an oil supply pipe 15 is connected to a separate oil sump container 11 at the lower end of the closed container 1, and the oil supply pipe 15 communicates with the above-mentioned axial extension line of the drive shaft 7. On the end surface of the oil supply pipe 15, a spherical slide bearing 12 different from the above-mentioned spherical slide bearing 10 is provided by a pedestal 16. Further, an oil supply pipe joint 13 is provided which connects the spherical slide bearings 10 and 12 with each other.

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

When the drive shaft 7 is rotated by the electric motor 3, the rotating motion of the crank pin 7a and the action of the rotation preventing mechanism 9 cause the orbiting scroll 5 to orbit without rotating. As a result, the orbiting scroll 5 and the fixed scroll 6
The space formed by the wraps 5b and 6b and the base plates 5a and 6a is moved to the center to reduce the volume thereof, and the gas sucked through the suction hole 6c is compressed and discharged through the discharge hole 6d. The discharged gas is discharged from the discharge pipe 1c after cooling the electric motor 3 through the passage 12 formed in the base plate 6a of the fixed scroll 6 and the frame 8. When the scroll performs a compression action, a force for separating the orbiting scroll 5 and the fixed scroll 6 acts. Therefore, in order to prevent this, the pressure in the back pressure chamber 8c on the back surface of the orbiting scroll is adjusted by the pressure equalizing hole 5d. , Lower than discharge pressure and higher than suction pressure (intermediate pressure).

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

Further, the oil supply pipe joint 12 and the spherical plain bearing 1
0 and 12 are connected by a combination of press fit and clearance fit, but in the case of clearance fit, it is possible to further provide a slide bearing in the spherical slide bearing to reduce the frictional force with the oil supply pipe joint 13. Is.

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 the two spherical plain bearings, and this joint is perpendicular to the axial direction of the drive shaft. The mounting error can be absorbed, and the mounting error in the axial direction can be absorbed because one of the oil supply pipe joints can slide in the spherical plain bearing by a clearance fit. In this way, it is possible to provide a lubrication joint that satisfies the mounting error in all directions, and reliably and reliably lubricate the sliding portion of the compressor.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hermetic scroll compressor showing an 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 ... Airtight 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 slide Bearing, 11 ... Oil sump container, 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 City, Shizuoka Prefecture Hitachi Ltd. Shimizu Plant

Claims (1)

Claim: What is claimed is: 1. A base plate and a fixed scroll consisting of a spiral wrap integral with the base plate and an orbiting scroll wrap are arranged so as to mesh with each other, and the orbiting scroll does not rotate with respect to the fixed scroll. A rotation prevention mechanism to rotate,
A scroll compressor equipped with a drive shaft for orbitally driving an orbiting scroll, a compression mechanism part including a frame supporting the drive shaft, and an electric motor for driving the same in a closed container, wherein a discharge connection part of the closed container is provided. And a separate oil sump container are connected by a discharge pipe, and at least two oil supply holes are provided near the end face of the oil sump container and the electric motor side of the drive shaft.
An oil supply device for a hermetic scroll compressor, characterized in that an oil passage communicating with each other through a joint having a single spherical plain bearing is formed and oil is supplied at a differential pressure.