JPS6343422Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement in an oil-free scroll type fluid machine suitable for use in, for example, air compressors, pumps, blowers, etc.

[Conventional technology]

Conventionally, a fixed scroll is fixed to a casing and has a spiral wrap part, a drive shaft is rotatably supported with respect to the casing and has a crankshaft at its tip, and a drive shaft is attached to the crankshaft. an orbiting scroll that is rotatably supported and has a spiral wrap portion that overlaps the wrap portion of the fixed scroll at a predetermined angle; A scroll-type fluid machine is known that includes a rotation prevention mechanism including an auxiliary crank provided between the two.

When this scroll-type fluid machine is used as an air compressor, the air sucked in from the suction port is sealed in a pressurized space formed between the fixed scroll and the orbiting scroll, and while the orbiting scroll revolves. The closed space is compressed to compress the air, and the compressed air is discharged from a discharge port formed in the center of the fixed scroll.

[Problem that the invention attempts to solve]

However, in the case of the conventional technology, a suction passage is bored in the casing, and a suction port is bored in the orbiting scroll to suck in external air from the suction passage through the crank chamber, and a mechanism is used to prevent dust from entering the suction passage. The suction system was equipped with a filter.

Therefore, although it is possible to cool the orbiting scroll, casing, etc. with the air sucked in from the suction passage, the filter provided in the suction passage causes negative pressure in the crank chamber, and the drive shaft However, lubricating oil such as grease sealed in the bearing that supports the orbiting scroll and the auxiliary bearing that supports the anti-rotation mechanism leaks into the crank chamber, shortening the life of the bearing.

For this reason, conventional technology uses expensive pressure-resistant seals for grease-filled bearings or provides a reservoir for storing lubricating oil in the casing, so that lubricating oil is constantly supplied to the bearings, but the structure is complicated. It had the disadvantage of becoming .

The present invention was developed in view of the problems of the conventional technology, and is a scroll-type fluid that can extend the life of the drive shaft, the bearing that supports the orbiting scroll, the auxiliary bearing that supports the anti-rotation mechanism, etc. The purpose is to provide machinery.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention includes a casing in which a bearing part and a cylindrical part having a larger diameter than the bearing part are formed in the axial direction, and the casing is fixedly attached to the cylindrical part side of the casing, and is attached to the end plate. a fixed scroll having a spiral wrap portion erected thereon; a drive shaft rotatably supported via a bearing in which lubricating oil is sealed in a bearing portion of the casing, and having a crankshaft at a tip end thereof extending into the cylindrical portion; , which is rotatably supported by the crankshaft via another bearing located in the cylindrical portion of the casing and filled with lubricating oil, and which overlaps the lap portion of the fixed scroll at a predetermined angle on the end plate. Rotation prevention consisting of an orbiting scroll with a raised wrap portion and an auxiliary crank provided between the casing and the orbiting scroll via an auxiliary bearing filled with lubricating oil to prevent rotation of the orbiting scroll. In the scroll fluid machine, the cylindrical portion of the casing is provided with a suction passage for sucking fluid toward a crank chamber formed between the cylindrical portion and the back surface of the orbiting scroll, and A suction groove is formed on the outside of the wrap portion of the fixed scroll, and a suction port is formed in the end plate of the orbiting scroll for sucking fluid from the crank chamber toward the suction groove, and a suction port is provided to prevent dust from entering. It is characterized by having a filter installed.

[Effect]

By rotating the drive shaft, the orbiting scroll rotates relative to the fixed scroll, sealing gas in the sealed space formed between the fixed scroll and the orbiting scroll, and reducing the sealed space. Compress a gas. At this time, by providing a suction port on the end plate of the orbiting scroll to suck in the gas in the crank chamber, and attaching a filter to the suction port to prevent dust from entering, the crank chamber becomes a negative pressure and the lubricant sealed in each bearing is removed. This prevents oil from leaking into the crank chamber, thereby extending the life of the bearing.

〔Example〕

The present invention will be explained below along with the embodiments shown in FIGS. 1 and 2.

In the drawings, 1 is a casing, and the casing 1 has a bearing part 1A, a cylindrical part 1B having a larger diameter than the bearing part 1A, and a lid body 1C integrally formed in the axial direction, and an opening of the cylindrical part 1B. A fixed scroll 2 is fixedly provided on the side.

The fixed scroll 2 includes an end plate 2A fixed to a cylindrical portion 1B, a wrap portion 2B erected on the end plate 2A, a heat dissipation fin 2C formed on a surface facing the wrap portion 2B, and a wrap portion 2B. The wrap portion 2B is formed into an involute or a spiral shape close to this (see FIG. 2). A curved suction groove 3 is formed in the concave portion 2D between the concave portion 2D and a spiral portion on the outer periphery of the lap portion of the orbiting scroll as described later, and a discharge port 4 is formed in the center of the end plate 2A.

5 is a drive shaft provided on the same axis as the fixed scroll 2; a crankshaft 6 extending into the cylindrical portion 1B is integrally provided with the drive shaft 5; The center is eccentric by a distance δ. 7, 7 are bearings such as angular ball bearings, and the outer ring of each bearing 7 is connected to the bearing part 1 of the casing 1.
A, and the inner ring is press-fitted into the drive shaft 5, so that the drive shaft 5 is attached to the casing 1 so that it cannot be displaced in the axial direction and radial direction, and lubricating oil is inside each bearing 7. It is filled with oil, and both ends thereof are sealed by oil seals 8, 8.

Reference numeral 9 denotes an orbiting scroll located within the cylindrical portion 1B of the casing 1 and provided on the same axis as the crankshaft 6. The orbiting scroll 9 includes an end plate 9A and a spiral wrap provided upright on the end plate 9A. Part 9B
and a bearing hole 9C formed on the surface facing the wrap portion 9B. The wrap portion 9B is formed into an involute or a curve close to an involute (see FIG. 2), and the wrap portion 9B is attached to the wrap portion 2B of the fixed scroll 2 so as to be shifted by a predetermined angle and overlapped with the wrap portion 2B, 9.
A plurality of pressure chambers 10, 10, . . . are formed between B. 11, 11 are bearings such as angular ball bearings similar to the bearing 7, and the outer ring of each bearing 11 is press-fitted into the bearing hole 9C, and the inner ring is press-fitted into the crankshaft 6. The orbiting scroll 9 is attached to the crankshaft 6 so as not to be displaceable in the axial and radial directions, and each bearing 11 is filled with lubricating oil and sealed by an oil seal 12.

In addition, 13 is the casing 1 and the orbiting scroll 9.
An auxiliary crank 13 is provided as an anti-rotation mechanism between the auxiliary crank 13 and the auxiliary crank 13 via an auxiliary bearing such as a cylindrical roller bearing.For example, two auxiliary cranks 13 are provided at different positions as shown in FIG. In the auxiliary crank 13, the shaft 13A on the casing 1 side and the shaft 13B on the orbiting scroll 9 side are eccentric by a distance δ, and the orbiting scroll 9 is rotated by the auxiliary crank 13 with a radius δ centered on the axis of the fixed scroll 2.
It revolves with . Note that the auxiliary crank 13
As shown in FIG. 1, the auxiliary bearing that supports this is a cylindrical roller bearing filled with lubricating oil and sealed with an oil seal.

Furthermore, the casing 1 has a suction passage 14.
The suction passage 14 communicates with a crank chamber 15 formed between the inside of the cylindrical portion 1B of the casing 1 and the back surface of the end plate 9A of the orbiting scroll 9. On the other hand, the above-mentioned suction groove 3 is connected to the fixed scroll 2.
The suction groove 3 is formed in a curved shape with a diameter larger than the envelope of the outer circumferential spiral portion 9B' of the wrap portion 9B in the concave portion 2D.
The crank chamber 15 is always closed by
It is communicated with. And the suction port 16
A filter 17 for preventing dust from entering is attached via a bracket 18. In addition, 1 in the figure
Reference numerals 9 and 20 indicate counterweights fixed to the drive shaft 5, and 21 indicates an external attachment member for attaching the casing 1.

In the scroll fluid machine configured in this manner, when a motor (not shown) is rotated, the rotation is transmitted to the orbiting scroll 9 via the drive shaft 5, crankshaft 6, and bearing 11. The axis of the orbiting scroll 9 and the axis of the fixed scroll 2 are eccentric by a distance δ, and the axis 13 of the auxiliary crank 13 is eccentric.
Since A and 13B are also eccentric by the distance δ, the orbiting scroll 9 performs a circular motion relative to the fixed scroll 2.

On the other hand, since the casing 1 is provided with a suction passage 14 and the orbiting scroll 9 is also provided with a suction port 16, external air is sucked into the crank chamber 15 from the suction passage 14.
Casing 1, back of orbiting scroll 9, bearing 7,
11 and the like, and is sucked into the suction groove 3 via the filter 17 and the suction port 16, and is supplied to the pressure chamber 10. The compressed air that is gradually compressed within the pressure chamber 10 is discharged from the discharge port 4 during the orbiting process of the orbiting scroll 9 .

However, in this embodiment, the orbiting scroll 9
A suction port 16 is provided in the suction port 1.
Since the filter 17 is provided in the crank chamber 6, even if the air in the crank chamber 15 is sucked into the suction groove 3 through the filter 17, the crank chamber 15 is replenished with external air from the suction passage 14. Therefore, since the inside of the crank chamber 15 is always at the same pressure as the outside, the lubrication sealed inside the bearings 7, 11 due to the differential pressure between the insides of the bearings 7, 11 and the crank chamber 15, as in the prior art. There is no risk of oil leaking into the crank chamber 15 through the seal members 8, 12, respectively, and the life of the bearings 7, 11 can be extended, and it is not necessary to use a special pressure-resistant oil seal 8. There is no. On the other hand, the auxiliary crank 13
The lubricating oil sealed in the auxiliary bearing is also prevented from leaking into the crank chamber 15 in the same way as described above. Further, since the filter 17 is provided on the side of the rotatable orbiting scroll 9, dust adhering to the filter 17 easily falls into the crank chamber 15, thereby preventing clogging.

Although the above-described embodiments have been described as scroll-type air compressors, the present invention is not limited to this, and may be applied to pumps and blowers.

[Effect of idea]

The scroll type fluid machine according to the present invention is as described in detail above, and since the filter is attached to the suction port bored in the orbiting scroll, negative pressure is created in the crank chamber, and the drive shaft and the orbiting scroll are The lubricating oil sealed in each bearing supporting the auxiliary crank can be prevented from leaking into the crank chamber, and the life of each of these bearings can be extended. Further, since there is no need to separately provide a reservoir for storing lubricating oil in the casing and constantly supply oil from the reservoir to the bearing, the structure can be simplified. Furthermore, since the filter is provided on the orbiting scroll, dust adhering to the filter due to the rotation of the orbiting scroll easily falls into the crank chamber, thereby preventing the filter from clogging.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a scroll-type fluid machine according to the present invention, and FIG. 2 is a cross-sectional view in the direction indicated by the - arrow in FIG. 1. 1...Casing, 2...Fixed scroll, 3
... Suction groove, 5 ... Drive shaft, 6 ... Crankshaft, 9 ... Orbiting scroll, 7, 11 ... Bearing,
13... Rotation prevention mechanism, 14... Suction passage, 1
5... Crank chamber, 16... Suction port, 17
...Filter.

Claims (1)

[Scope of utility model registration request] A casing in which a bearing part and a cylindrical part having a larger diameter than the bearing part are formed in the axial direction; a drive shaft rotatably supported via a bearing filled with lubricating oil in the bearing portion of the casing, and having a crankshaft at its tip extending into the cylindrical portion; an orbiting scroll which is rotatably supported by the crankshaft via another bearing enclosed therein, and has a spiral wrap part erected on the end plate and which overlaps the lap part of the fixed scroll at a predetermined angle, and the orbiting scroll; A scroll-type fluid machine comprising an anti-rotation mechanism consisting of an auxiliary crank provided between the casing and the orbiting scroll via an auxiliary bearing filled with lubricating oil to prevent the rotation of the scroll, The cylindrical portion of the casing is provided with a suction passage for sucking fluid toward the crank chamber formed between the cylindrical portion and the back surface of the orbiting scroll, and a suction groove is provided on the outside of the wrap portion of the fixed scroll. A scroll characterized in that the end plate of the orbiting scroll is provided with a suction port for sucking fluid from the crank chamber toward the suction groove, and a filter for preventing dust from entering is attached to the suction port. formula fluid machine.