JPS6245991A - Scroll compressor - Google Patents

Abstract

PURPOSE:To obtain the sufficient feed oil head by providing the first lubrication pump at one end of a driving shaft on the motor side and providing the second lubrication pump at the other end of the driving shaft on the compressor side together with conducting the oiling to two bearings in a serial manner. CONSTITUTION:Oiling is conducted by both a truncated-cone-shaped oil sucking pipe 5d, which is soaked in an oil sump situated underneath a sealed vassel 7 and which is located at one end of a driving shaft 5, and the first lubrication pump, which is made up of an eccentric lubrication hole 5c within the driving shaft. The pressure of the oil, which reached an eccentric hole 5a within the driving shaft, is further raised by the second lubrication pump mechanism that is made up of a groove 5e, and the oil is supplied to both a series path consisting of bearings 5b and 6a and a series path consisting of the bearing 5b and a thrust bearing 6b. With this contrivance, the head of a lubrication pump can be raised, thereby ensuring the stable lubrication.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to scroll compressors for refrigeration and air conditioning.

[Background of the invention]

This scroll compressor is housed in a chamber, and lubricating oil for the rotating parts is supplied by placing the lower end of the drive shaft in the oil reservoir of the compressor, as described in Japanese Patent Laid-Open No. 59-224494. In some parts, the oil passage provided in the shaft is given eccentricity in the radial direction, and oil is supplied using centrifugal force corresponding to the amount of eccentricity.However, in this structure, the oil supply head of the pump has an i41+ diameter, especially The size is determined by the shaft diameter of the motor rotor.
There is a drawback that it cannot be made large enough. In particular, centrifugal force cannot be determined by rotational speed.

Further, as disclosed in Japanese Patent Application Laid-Open No. 59-131702 and VC, it is possible to increase the capacity of the oil supply pump provided at the end of the drive shaft, but this is disadvantageous in that it becomes complicated and large in size.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll compressor having an oil supply device that can be miniaturized by providing a multi-stage oil supply pump and that can obtain a sufficient oil supply tod.

[Summary of the invention]

1iiiI as a method of giving orbiting motion to an orbiting scroll
When an eccentric hole is provided in the LII shaft and the shaft portion of the orbiting scroll is inserted into this eccentric hole, the shaft of the orbiting scroll and the eccentric hole perform a relative rotational movement, and the outer diameter of the shaft of the orbiting scroll is Seen from the center of the shaft, drive i1'! Since the radius is larger than that of the I+ oil supply hole, by giving this part a pumping action, it is possible to make the oil supply pump multi-stage, and the number of oil supply heads can be increased.

Focusing on the above points, the present invention has provided a first tube at the motor side Ill+ end of the drive shaft, the suction side of which is connected to the oil sump in the container.
a refueling pump is provided, a second refueling pump is provided on the compressor side shaft end of the drive shaft on the discharge side of the first refueling pump, and at least two bearings are provided on the discharge side of the second refueling pump; The second oil supply pump is characterized by supplying oil to the first bearing and the second bearing in series, and by diversifying the oil supply pump, the structure of the pump can be simplified and made smaller. be able to.

[Embodiments of the invention]

=41 An embodiment of the present invention will be explained with reference to FIGS. 1 to 3. 1st
The figure shows the overall structure of a scroll compressor in which the present invention is implemented. The compression mechanism section 1 includes an orbiting scroll 2, a fixed scroll 3, an anti-rotation mechanism 4, a drive shaft 5, and frames 61 and 62.
The frame 61 is arranged above the airtight container 7.
A motor 8 is placed below.

The orbiting scroll 2 has a spiral wrap 2 on the base plate 2a.
It has b. Further, on the opposite side of the base plate from the lap, there is a shaft 2C that is fitted into an eccentric hole 5C provided in the drive shaft 5.

A spiral wrap 3 is placed on the fixed scroll 3 base plate 3a.
b, and has a suction hole 3C on the outer periphery of the scroll and a discharge hole 3d in the center.

The frame is composed of two parts, and the upper frame 62 has a bearing 5a that supports the drive shaft 5 and a thrust bearing 6b that supports the back surface of the base plate of the orbiting scroll.

Bearing 6C16 that supports the lower frame 61 drive shaft 5
It has legs 6e for fixing the d% motor.

Moreover, the chamber 64 and the low pressure chamber 65 are pressure-equalized by 63 pressure-equalizing holes. 66 is a pressure equalizing hole between the chamber 67 and the chamber 64. The drive shaft 5 has an eccentric hole 5a at one end, and a bearing 5b for supporting the shaft of the orbiting scroll inside the eccentric hole.

In addition, an oil supply hole 5C is provided inside the shaft, which is eccentrically located near the center of the eccentric hole 5a, and which opens into the eccentric hole 5a and at the other end. A pipe 5d is installed.

The orbiting scroll 2 and the fixed scroll 1 are assembled with each other with their wraps facing inward, and the orbiting scroll 2 is held between the fixed scroll 1 and frames 62 and 61.

The drive shaft 5 is installed in the frame 61, and the eccentric hole 5 of the shaft 5
The shaft 2C of the orbiting scroll 2 is inserted into a. Also,
A motor 8 is installed between the base plate 2a of the orbiting scroll 2 and the frame 62 on the leg of the frame 61 on which the anti-rotation mechanism 4 is installed, and these compression mechanisms are housed in a closed container. An oil reservoir 71 is provided below the closed container 7, and the lower end of the drive shaft 5 is immersed in the oil.

The seven-frame sealed container has a suction pipe 7a below the frame 61, and a discharge pipe 7b above the fixed scroll 1.

The second oil supply pump of the present invention is provided at the end of the shaft 2C of the orbiting scroll 2 inserted into the eccentric hole 5a of the drive shaft.

Details of an embodiment of the present invention are shown in FIGS. 2 and 3.

The end surface of the shaft 2C of the orbiting scroll has a slight clearance from the bottom of the eccentric hole 5a of the drive shaft 1I5, and the bottom of the eccentric hole of the drive shaft is provided in the radial direction constituting a second oil supply pump communicating with the oil supply hole 5C. It has a groove 5e.

The oil entering from the oil supply hole 5C is pressurized by the groove 5e, and the oil enters the bearing 5.
b and other bearings in series.

The groove 5e is provided in the same direction as the eccentric direction of the oil supply hole 5C, which is provided eccentrically.

Next, the operation of the present invention will be described.

Gas is sucked in from the low-pressure side of the refrigeration cycle such as an evaporator through the suction pipe 7a, and after cooling the motor 8, is sucked in through the suction hole 3C of the fixed scroll 1, compressed by the orbiting scroll 2 and the fixed scroll 1, and then discharged through the discharge hole 3d. It is discharged from the C1 discharge pipe 7b to the high pressure side of a condenser or the like.

Oil is supplied through a truncated conical oil suction pipe 5d at the end of the drive shaft 5, which is immersed in an oil reservoir below the closed container 7, and an eccentric oil supply hole 5C in the shaft.
The oil reaching the eccentric hole 5a of the drive shaft is pressurized into a nail by the second oil pump mechanism, and is connected to a series system of bearings 5b and 6a, and bearing 5b.

It is supplied to the series line of the thrust bearing 6b.

As shown in Fig. 3, this radial groove 5d is in the range of ±90° with respect to the line C extending to the B side of the line connecting the center A of the drive shaft and the center B of the eccentric hole. If it is provided in the DB, it is effective because the radius from the center A of the drive shaft can be large.

FIG. 4 shows another embodiment, in which the groove direction is provided at approximately 45 degrees.

In addition, as shown in the embodiment shown in FIG. 4, an oil groove 5F is provided on the inner surface of the bearing 5b provided in the eccentric hole of the drive shaft, and this oil groove runs in the same direction as (2) the radial groove 5e at the bottom of the center hole. Alternatively, if it is provided on the downstream side in the rotational direction, appropriate oil can be supplied to the bearing load point.

In the example of FIG. 4, the oil groove 5F of the bearing is
According to this example, the oil supply pressure can be increased and oil can be supplied to an appropriate oil supply position IN.

Furthermore, as in another embodiment shown in FIG. 5, the groove machining can be facilitated by separately forming the member 9 having these radial grooves and attaching and fixing it to the bottom of the eccentric hole. can.

Details of still another embodiment of the invention are shown in FIGS. 6 and 7.

The end of the shaft 2C of the orbiting scroll is connected to the eccentric hole 5 of the drive shaft 3.
A hole 2d is provided in the center of the shaft, facing the oil supply hole 5C that opens at the bottom of the eccentric hole of the drive shaft, and a hole 2d is provided in the radial direction as shown in FIG. It has a plurality of grooves 2e.

Oil entering the hole 2d from the oil supply hole 5C is pressurized by the groove 2e and is supplied via the bearing 5b and another bearing 6a or 6b in series.

If this radial groove is curved as shown in FIG. 8, the pressure increasing effect will be even greater.

Furthermore, in order to facilitate these processes, as shown in FIG. 9, a pump mechanism 90 formed separately from the shaft of the orbiting scroll can be fixed to the tip of the shaft of the orbiting scroll.

Regarding the pump mechanism, in addition to the structure in which centrifugal force is the main acting force as shown in the embodiments shown in Figs. 6 to 9, the pump mechanism has a structure in which centrifugal force is the main acting force, as shown in the embodiments shown in Figs. 10 and 11. Pump mechanisms that also take into account viscous force, such as a curved groove 5g or a spiral groove 5h, are also conceivable.

Even if it has a complicated shape, it can be easily manufactured by molding it separately from the drive shaft, as in the embodiment shown in FIG.

〔Effect of the invention〕

According to the present invention, the head of the oil supply pump can be raised with a simple structure, so that stable oil supply can be performed.

Particularly, sufficient oil can be supplied during low-speed variable speed operation such as inverter drive.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a scroll compressor showing an embodiment of the present invention. FIG. 2 is a partial sectional view of the bearing part, FIG. 3 is a plan view of FIG. 2, FIG. 4 is a plan view of another embodiment, FIG. 5 is a sectional view of still another embodiment, and FIG. 6 is a sectional view of still another embodiment, FIG. 7 is a partial plan view of FIG. 6, FIG. 8 is a plan view of still another embodiment, and FIG. 9 is a partial sectional view of still another embodiment. FIGS. 10 and 11 are plan views of still other embodiments. 1... Compression mechanism section 2... Orbiting scroll 2
a... Base plate 2b... Wrap 2C... Shaft
2d... Hole 2e... Groove 3... Fixed scroll 3a... Base plate 3b... Wrap 3
C...Suction hole 1l-3d...Discharge hole 4...Rotation prevention mechanism 5...
・Drive shaft 5a... Eccentric hole 5b... Bearing
5c...Oil supply hole 5d...Oil absorption pipe 61.62
...Frame 6a...Bearing 6b...Thrust bearing 6c...Bearing 6d...Bearing 6e
...Leg 7...Airtight container 7a...Suction tube
7b...Discharge pipe 8...Motor 9...Separate pump.

Claims (1)

[Claims] 1. An orbiting scroll having a spiral wrap standing upright on a base plate and a fixed scroll are combined with the wraps facing inward to each other, and an orbiting motion is given to the orbiting scroll so that the wraps of both scrolls and A scroll compressor section that reduces the volume of the space formed by the base plate and compresses it as it moves toward the center, and a motor, and the scroll compressor section and the motor are connected by a drive shaft and housed in a container. In a scroll compressor installed in a scroll compressor, a first refueling pump whose suction side is connected to an oil reservoir in a container is provided at a shaft end of the drive shaft on the motor side, and a first refueling pump whose suction side is connected to an oil reservoir in a container is provided, and a discharge side of the first refueling pump connects the drive shaft with A second oil supply pump is provided at the shaft end of the compressor section, and there are at least two bearings on the discharge side of the second oil supply pump, and the second oil supply pump has at least two bearings on the discharge side of the second oil supply pump. A scroll compressor characterized by serial oil supply. 2. The scroll compressor according to claim 1, wherein the two bearings provided in series are an orbiting scroll bearing and a thrust bearing provided on the back surface of the orbiting scroll. 3. The scroll compressor according to claim 1, wherein the two bearings provided in series are an orbiting scroll bearing and a main bearing fitted into the frame. 4. The second oil supply pump is a separate piece provided between the end of the orbiting scroll shaft inserted into the orbiting scroll bearing portion and the shaft end of the drive shaft and having a groove in the radial direction, Claim 1 Scroll compressor as described in section. 5. The scroll compressor according to claim 1, wherein the second oil supply pump is a radial groove provided in the end face of the orbiting scroll shaft or the end face of the drive shaft. 6. The scroll compressor according to claim 5, wherein the radial grooves are provided radially. 7. Claim 6, wherein the radial groove is curved
Scroll compressor as described in section. 8. The scroll compressor according to claim 5, wherein the radial groove has a spiral shape. 9. Claim 4, wherein the radial groove is provided in the same direction as the eccentric direction of the eccentrically provided oil supply hole.
Scroll compressor according to any one of items 5 to 6. 10. The scroll compressor according to any one of claims 4 to 5, wherein the radial groove is provided at an angle to the eccentric direction of the eccentrically provided oil passage.