JP2001065474A - Bearing oil feeding device of oilless scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely feed fresh oil for supplement of filling oil for oil-seal bearing for used in an oilless scroll compressor or for treating deteriorated oil, and to simplify the structure and reduce a cost. SOLUTION: The oil is led from a grease nipple 20 to the oil-seal bearing 8 installed a swing scroll 9 side through an oil feed path 19 drilled in a rotating shaft 2 and a crankshaft 6. Unnecessary oil such as deteriorated oil is forced out by newly fed oil, drained from a slanted hole 24 into return oil passage 21, and drained into a space 5 inside a case main body 1 through a return hole 22 provided in the return oil passage 21 at a stop position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-free scroll compressor, and more particularly to a bearing oil supply device for an oil-free scroll compressor that enables oil-tight bearings to be leak-free.

[0002]

2. Description of the Related Art Scroll compressors that do not require oil lubrication at meshing portions are used from the viewpoints of maintenance-free operation and improved economy. On the other hand, the scroll compressor is provided with a rotating shaft for rotating a orbiting scroll or the like, and this rotating shaft is pivotally supported by a bearing fitted to the case body. The orbiting scroll is connected to a crankshaft provided on the tip end side of the rotating shaft, but a bearing is often provided also at this portion. Since this bearing is located in a place where maintenance is difficult, an oil-sealed bearing is generally used.

[0003]

It is desirable that the above oil-sealed type bearing does not require oil replenishment in principle. However, since this portion involves a considerable load during operation of the compressor, and has poor cooling performance. High temperature easily. Therefore, there is a problem that the oil (grease) that has been sealed is deteriorated during long-term use, and the bearing function is deteriorated. In some cases, it is necessary to supply oil. For this purpose, some kind of lubrication is required. However, as described above, this oil-sealed type bearing is located in a place where it is difficult to supply oil from the outside. It should not cause the function to be reduced. However, in the prior art, there is no bearing lubrication device that has a simple structure and can solve the above-mentioned problem.

[0004] The present invention has been made in view of the above circumstances, and can reliably supply oil to an oil-sealed bearing, does not cause oil leakage to other parts, has a relatively simple structure and is inexpensive. It is an object of the present invention to provide a bearing lubricating device in an oilless scroll compressor that can be implemented in a variety of ways.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rotating shaft having a crankshaft pivotally supported by a case body and eccentric at the tip end, and an oil-sealed bearing mounted on the crankshaft. The oil-sealed bearing in the oilless scroll compressor having a revolving scroll pivotally supported via the thrust support on the case body side and a fixed scroll meshed with the revolving scroll and fixed to the case body side. An oil supply passage communicating with oil supply means and an oil reservoir provided on the orbiting scroll side in which the oil-sealed bearing is housed, and an oil supply passage and one end side of the oil supply device. A bearing lubrication device in an oilless scroll compressor in which a return oil passage communicating with the sealed bearing side and having the other end open to the outer peripheral side of the rotary shaft is formed. More specifically, the oil supply means is a grease nipple fixed to an open end of the rotating shaft. The oil reservoir is formed in a closed space by the oil-sealed bearing fitted to the orbiting scroll.

[0006] By introducing oil (grease) from an oil supply means into an oil supply passage provided on the rotating shaft, the oil is introduced into an oil reservoir communicating with the oil supply passage. Since the oil reservoir is provided in engagement with the oil-sealed bearing, new oil is introduced into the oil-sealed bearing. On the other hand, the old oil pushed out by the new oil communicates with the oil-sealed bearing and is pushed out into the return oil passage provided on the rotating shaft side. Discharged to a location. As described above, lubrication of the oil-sealed bearing is easily and reliably performed. Further, by employing a grease nipple fixed to the open end side of the rotating shaft as the lubricating means, there is no space problem and lubrication is facilitated. In addition, since the oil sump is formed in a closed space by an oil-sealed bearing, the oil introduced into the oil sump is not introduced to any place other than the oil-sealed bearing, and oil leakage and insufficient lubrication may occur. No failure occurs. In addition, the present invention has a simple structure in which a simple oil supply means such as a grease nipple, an oil supply path provided in the rotary shaft, a return oil path, an oil reservoir on the orbiting scroll side, and the like are provided. , And can be implemented at low cost.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a bearing lubricating apparatus in an oilless scroll compressor according to the present invention will be described below in detail with reference to the drawings. First, the overall structure of a scroll compressor to which the bearing lubrication device of the present invention is applied will be described with reference to FIG. A rotating shaft 2 is disposed substantially at the center of the case body 1. The rotating shaft 2 is disposed such that one end thereof is exposed to the outside of the case main body 1, and an intermediate portion thereof is pivoted by a first bearing 3 and a second bearing 4 of a grease-enclosed type fitted to the case main body 1. Supported. A space 5 is formed in the case body 1 between the first bearing 3 and the second bearing 4. An eccentric crankshaft 6 is formed on the other end of the rotating shaft 2, and a balance weight 7 supported by the rotating shaft 2 is provided near the crankshaft 6.

The crankshaft 6 is fitted on an inner race of an oil-sealed bearing 8, and an outer race of the inner race is formed by a revolving scroll 9.
Is fitted in the boss portion 10. On the other hand, the orbiting scroll 9
Is supported by the case body 1 through a thrust plate 11 and the like, and meshes with the fixed scroll 12.
The fixed scroll 12 is fixed to the case body 1. A drive pulley 13 is fixed to a portion of the rotating shaft 2 exposed from the case body 1, and the drive pulley 13 is driven to rotate by a power unit (not shown).

When the drive pulley 13 is operated, the rotating shaft 2 is pivotally supported by the first and second bearings 3 and 4 and rotates.
The crankshaft 6 is driven eccentrically, and the orbiting scroll 9 orbits while meshing with the fixed scroll 12 to compress the introduced air. The compressed air is discharged from the exhaust port 14 and the like.

In the case of an oilless scroll compressor, the meshing portions of the orbiting scroll 9 and the fixed scroll 12 are in an oilless state, and are appropriately cooled by a cooling means (not shown). On the other hand, in the case of an oilless scroll compressor, the first bearing 3
The second bearing 4 and the second bearing 4 may not necessarily be oil-sealed bearings from the arrangement position, but the oil-sealed bearing 8 is employed as the bearing arranged on the orbiting scroll 9 as described above. The oil-sealed bearing 8 is made of a material which is sealed with grease or the like in advance, and is kept in an oil-free state for a long time in principle.

Next, the detailed structure of the oil-sealed bearing 8 and its surrounding components will be described with reference to FIG. The crankshaft 6 includes a large-diameter portion 6a on the balance weight 7 side and a reduced-diameter portion 6b protruding from the large-diameter portion 6a. The area around the large diameter portion 6 a is covered by a cover 15 fixed to the boss 10 of the orbiting scroll 9. A seal member 16 is provided in the cover 15, and the lip portion 16 a of the seal member 16 has a large diameter portion 6.
a is pressed against the outer periphery of a to seal the large diameter portion 6a.

On the other hand, the outer race 8a of the oil-sealed bearing 8 is fitted to the boss 10 of the orbiting scroll 9 via the collar member 17. On the other hand, the inner race 8b is fitted to the reduced diameter portion 6b of the crankshaft 6. The outer race 8
A roller 8c is interposed between the inner race 8a and the inner race 8b.
On the other hand, an oil reservoir 18 is formed at the center of the end plate 9a of the orbiting scroll 9. The oil sump 18 is formed of a shallow circular groove, and has an outer circumference substantially equal to or slightly smaller than the outer diameter of the oil-sealed bearing 8. Therefore, the oil sump 18 is formed by the oil-sealed bearing 8 and the collar member 17.
To form a closed space.

As shown in FIG. 1 and FIG. 2, an oil supply passage 19 is bored on an axis in the rotary shaft 2. This refueling channel 1
Reference numeral 9 is formed through the rotating shaft 2 and the crankshaft 6 and is open at both ends. That is, one end side is opened at the end of the rotating shaft 2 exposed from the case body 1, and the other end is opened at the end of the crankshaft 6. Since the end of the crankshaft 6 is disposed facing the oil sump 18, the oil supply passage 19 communicates with the oil sump 18. The drive pulley 13 of the oil supply passage 19
A grease nipple 20, which is one of the oil supply means, is connected to the opening on the side.

On the other hand, a return oil passage 21 parallel to the oil supply passage 19 is formed in the rotary shaft 2 and the crankshaft 6. The return oil passage 21 is a blind hole that opens on only one side. That is, one end is opened to the oil reservoir 18 side, and the other end of the dead end is opened to the outer peripheral side of the rotating shaft 2 via the return hole 22. The position where the return hole 22 is formed is the location of the space 5 described above.

The oil reservoir 18 side of the return oil passage 21 is closed by a blind plug 23. An oblique hole 24 is provided in the large diameter portion 6 a of the crankshaft 6. As shown in FIG. 2, the oblique hole 24 communicates one end with the return oil passage 21,
The other end is formed so as to communicate with the roller 8c side of the oil-sealed bearing 8.

Next, a method of lubricating the oil-sealed bearing 8 by the bearing lubricating apparatus of the present invention will be described. First, when oil (grease) is injected from the grease nipple 20, oil is supplied from the oil supply path 19 toward the tip end of the rotary shaft 2 as shown by an arrow in FIG. 8 is introduced. The introduced new oil pushes out, for example, deteriorated oil in the oil-sealed bearing 8, and the deteriorated oil is sent from the oblique hole 24 to the return oil passage 21. The oil in the return oil passage 21 advances to the stop portion, and is discharged from the return hole 22 into the space 5. Although the oil discharged into the space 5 is blocked by the first and second bearings 3 and 4 and does not enter the orbiting scroll 9, the return hole is required to completely prevent the adverse effects of the oil discharge. Of course, it is also possible to connect an unillustrated discharge pipe or the like to 22 and discharge oil outside the case body 1.

As described above, since the oil sump 18 forms a closed space by the oil-sealed bearing 8 and the like, the oil from the oil supply passage 19 does not leak to a location other than the oil-sealed bearing 8. . Although only one diagonal hole 24 is shown in FIG. 2, some diagonal holes 24 may be formed around the large diameter portion 6 a and communicate with the return oil passage 21. As described above, lubrication in the oil-sealed bearing 8 is easily performed by lubricating the oil from the grease nipple 20, and the lubrication path 19 and the return oil path 21
The oblique holes 24 and the like are all formed inside the rotating shaft 2, the crankshaft 6, and the like, so that they are compactly assembled and do not require special return oiling means.

[0018]

According to the present invention, lubrication of an oil-sealed bearing in a position where lubrication is difficult can be easily performed by a simple device.
In addition, the effect is ensured and the old oil is reliably discharged. In addition, it is possible to implement compactly and inexpensively without using a special separate product.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing an overall schematic structure of an oilless scroll compressor provided with a bearing oil supply device of the present invention.

FIG. 2 is a partially enlarged axial sectional view showing a detailed structure around an oil-sealed bearing in FIG. 1 and a bearing lubricating device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main body 2 Rotating shaft 3 First bearing 4 Second bearing 5 Space part 6 Crankshaft 6a Large diameter part 6b Reduced diameter part 7 Balance weight 8 Oil-sealed bearing 8a Outer race 8b Inner race 8c Roller 9 Turning scroll 9a Mirror plate DESCRIPTION OF SYMBOLS 10 Boss part 11 Thrust plate 12 Fixed scroll 13 Drive pulley 14 Exhaust port 15 Cover 16 Seal member 16a Lip part 17 Color member 18 Oil reservoir 19 Oil supply path 20 Grease nipple 21 Return oil path 22 Return hole 23 Plug 24

Claims (3)

[Claims] A rotary shaft pivotally supported by a case main body and having a crankshaft eccentric to the tip end side; and an orbiting scroll pivotally supported by the crankshaft via an oil-sealed bearing and thrust supported by the case main body side. And a fixed scroll fixed to the case main body side and meshed with the orbiting scroll, wherein the oil-sealed bearing oil supply device in the oilless scroll compressor, wherein the rotary shaft communicates with oil supply means. And an oil supply passage communicating with an oil reservoir provided on the orbiting scroll side in which the oil-sealed bearing is housed, and one end connected to the oil-sealed bearing and the other end to the outer periphery of the rotary shaft. A bearing lubrication device in an oilless scroll compressor, wherein a return oil passage that opens is formed. 2. The bearing lubricating device according to claim 1, wherein the lubricating means is a grease nipple fixed to an open end of the rotating shaft. 3. The bearing according to claim 1, wherein the oil reservoir is formed in a closed space by the oil-sealed bearing fitted to the orbiting scroll. Refueling equipment.