JPH06249166A - Scroll fluid machine - Google Patents

Abstract

PURPOSE:To prevent lubricating oil in a casing from entering each compression chamber to deliver clean compressed air, etc. CONSTITUTION:An annular member 14 is provided between a casing 1 and a fixed scroll 10. Also an oil 2 leaked to the fixed scroll 10 side among lubricating oil 2 which has lubricated and cooled a rotating scroll 7 is caught in an oil sump 14D in the annular member 14, and returned to the casing 1 through a return pipe 16. Then a seal member 15 is provided between the rotating scroll 7 and the annular member 14 to shut off the oil sump 14D from each compression chamber 11. Thus the leaked oil 2 is prevented from entering the compression chambers 11, and clean compressed air is blown from a delivery port 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine suitable for use in, for example, an air compressor or a vacuum pump, and more particularly to a semi-lubricating scroll type fluid machine in which a casing is lubricated with lubricating oil. Machine related.

[0002]

2. Description of the Related Art Generally, a semi-lubricating scroll type fluid machine has a cylindrical casing, one end of which is closed by a bearing portion and the other end of which is open, and is rotatably supported by a bearing portion of the casing. , A drive shaft whose front end side serves as a crank portion in the casing, and a orbiting scroll which is located in the casing and is turnably provided on the crank portion of the drive shaft, and a spiral wrap portion is erected on the end plate. A fixed scroll provided on the other end side of the casing so as to face the orbiting scroll, and a spiral wrap portion overlapping with the wrap portion of the orbiting scroll is erected on the end plate; and a wrap portion of the fixed scroll. And a plurality of compression chambers that are formed between the orbiting scroll and the wrap portion of the orbiting scroll and sequentially discharge the fluid sucked through the suction port and discharge the fluid through the discharge port. That.

When this type of scroll type fluid machine is used as an air compressor, the drive shaft is externally driven by an electric motor or the like to orbit the orbiting scroll.
While sequentially compressing the air sucked from the suction port in each compression chamber formed between each wrap portion of the orbiting scroll and the fixed scroll, the compressed air is discharged from the discharge port and stored in an external air tank or the like. ing.

The lubricating oil contained in the casing is jumped up into the casing by the rotation of the drive shaft, between the bearing portion of the casing and the drive shaft, between the crank portion of the drive shaft and the orbiting scroll, and The space between the orbiting scroll and the casing is lubricated and these are cooled to prevent the inside of the casing from becoming hot due to the compression heat from the compression chamber.

[0005]

By the way, in the scroll type fluid machine according to the above-mentioned prior art, each part can be lubricated and cooled by jumping up the lubricating oil in the casing, but a part of this lubricating oil is used. Will gradually leak to the fixed scroll side through the gap between the casing and the orbiting scroll.

As a result, the lubricating oil (leakage oil) leaking to the fixed scroll side is sucked into the compression chamber on the outermost peripheral side formed between the orbiting scroll and the fixed scroll lap portion together with the fluid sucked through the suction port. Rarely, as a result,
For example, there is a problem that clean compressed air cannot be discharged from the discharge port.

The present invention has been made in view of the above-mentioned problems of the prior art, and prevents the lubricating oil in the casing from invading each compression chamber, and for example, can discharge clean compressed air or the like. An object is to provide a hydraulic fluid machine.

[0008]

The structure adopted by the present invention has a cylindrical casing having one end side closed as a bearing portion and the other end side opened, and a bearing rotatably supported by the bearing portion of the casing. , A drive shaft whose front end side serves as a crank portion in the casing, and a orbiting scroll which is located in the casing and is turnably provided on the crank portion of the drive shaft, and a spiral wrap portion is erected on the end plate. A fixed scroll provided on the other end side of the casing so as to face the orbiting scroll, and a spiral wrap portion overlapping with the wrap portion of the orbiting scroll is erected on the end plate; and a wrap portion of the fixed scroll. And a wrap portion of the orbiting scroll, and a plurality of compression chambers for sequentially compressing the fluid sucked through the suction port and discharging the fluid through the discharge port.

In order to solve the above problems,
The feature of the configuration adopted by the present invention is that between the casing and the fixed scroll, it is located on the outer peripheral side of the orbiting scroll, and among the lubricating oil stored in the casing, the leaked oil leaked to the fixed scroll side is An oil sump for trapping is provided, and a return passage for returning the leaked oil in the oil sump into the casing is provided between the oil sump and the casing.

A seal member is provided between the casing or the fixed scroll and the orbiting scroll, the seal member being located closer to the fixed scroll than the oil sump to shut off the inside of the casing from the compression chambers. It is preferable that the oil sump is surrounded by a seal member.

Further, it is preferable that the return passage is constituted by a return pipe connected to the casing such that the base end side is connected to the oil reservoir and the tip end side is opened near the one end side in the casing.

Further, it is preferable to provide a scattering prevention means between the oil sump and the fixed scroll to prevent leakage oil trapped in the oil sump from scattering in each compression chamber.

[0013]

With the above structure, among the lubricating oils housed in the casing, the leaked oil that leaks to the fixed scroll side through the space between the orbiting scroll and the casing is caught by the oil sump and goes out of the oil sump. Leakage is prevented, and the leaked oil trapped in the oil sump is returned to the casing through the return passage.

Further, by providing a seal member between the casing or the fixed scroll and the orbiting scroll, it is possible to prevent the leaked oil trapped in the oil sump from entering each compression chamber, and to tilt during transportation. However, it is possible to prevent the lubricating oil in the casing from leaking to the outside.

Further, by connecting the oil sump to the vicinity of one end side in the casing through the return pipe, it is possible to prevent the lubricating oil contained in the casing from flowing into the oil sump when tilted.

Furthermore, by providing a scattering prevention means between the oil sump and the fixed scroll, it is possible to prevent the leakage oil trapped in the oil sump from scattering and invading each compression chamber, and at the time of transportation. It is possible to prevent the lubricating oil in the casing from leaking to the outside even when the housing is inclined to the same direction.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 11 by taking a scroll type air compressor as an example of a scroll type fluid machine.

First, FIGS. 1 and 2 show a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a casing which constitutes the outer shell of a scroll type air compressor.
Is a disc-shaped lid portion 1A located at one end side,
A cylindrical portion 1B extending from the outer peripheral side of the lid portion 1A toward the other side.
Is formed in a cylindrical shape with a lid, and a small-diameter cylindrical bearing portion 1C is integrally provided on the inner peripheral side of the lid portion 1A. Further, the lubricating oil 2 is accommodated inside the casing 1 at the lower end side, and the lid portion 1A is provided near the liquid surface of the lubricating oil 2.
A connection hole 1D, which is located at, is connected to a plug 16B of the return pipe 16 described later. Further, an oiling hole 1E is formed on the upper end side of the cylindrical portion 1B.
A cap 19 described later is attached to the.

Reference numeral 3 denotes a thrust receiving portion which is integrally provided on the other end side of the casing 1 and projects radially inward from the cylindrical portion 1B. The thrust receiving portion 3 is a rear surface of an end plate 7A of an orbiting scroll 7 which will be described later. It is in sliding contact with the side to receive the load in the thrust direction. An oil hole 3A for returning the lubricating oil 2 that lubricates the space between the thrust receiving portion 3 and the end plate 7A into the casing 1 is bored on the outer peripheral side of the thrust receiving portion 3.

Reference numeral 4 denotes a bearing 5 in a bearing portion 1C of the casing 1.
6 shows a drive shaft rotatably supported via 6, and the tip side of the drive shaft 4 extends into the casing 1 to form a crank portion 4A, and the axis of the crank portion 4A is aligned with the axis of the drive shaft 4. On the other hand, it is eccentric by a predetermined dimension d. The drive shaft 4 has a base end side protruding outside the casing 1 and coupled to an electric motor or the like (not shown), and is rotationally driven by the electric motor.

Reference numeral 7 denotes a revolving scroll provided on the other end side of the casing 1 so as to be revolvable, and the revolving scroll 7
Is a disk-shaped end plate 7A, a spiral wrap portion 7B erected so that the center side of the end plate 7A is the winding start end, and the outer peripheral side is the winding end end, and the wrap portion 7B. The cylindrical projection 7C is provided upright on the end plate 7A so as to surround the outer peripheral side and a boss portion 7D provided at the center of the back side of the end plate 7A. It is rotatably attached to the crank portion 4A of the drive shaft 4 via the bearing 8. Further, on the rear surface side of the end plate 7A, a plurality of key grooves 7E, which are located on the outer peripheral side of the boss portion 7D,
7E (only two are shown) are formed at a predetermined interval in the circumferential direction, and Oldham couplings 9 and 9 as a rotation preventing mechanism are connected to the respective key grooves 7E. When the drive shaft 4 is driven to rotate, the orbiting scroll 7 is prevented from rotating by the Oldham couplings 9 and the crank portion 4 is rotated.
It revolves (revolves) with a revolving radius of the eccentric dimension d of A.

Reference numeral 10 denotes a fixed scroll located at the other end side of the casing 1 so as to face the orbiting scroll 7, and the fixed scroll 10 has its center at the drive shaft 4.
End plate 1 disposed in the central portion so as to coincide with the axis of
0A and a spiral wrap portion 10B that is erected on the end plate 10A in the same manner as the wrap portion 7B of the orbiting scroll 7,
The mounting cylinder is generally composed of a cylindrical mounting cylinder portion 10C which is located on the outer peripheral side of the end plate 10A, extends to one side, and is fixed to a cylindrical portion 1B of the casing 1 via an annular member 14 described later. An annular suction passage 10D is formed on the inner peripheral side of the portion 10C.

The fixed scroll 10 is disposed so that the wrap portion 10B of the fixed scroll 10 overlaps with the wrap portion 7B of the orbiting scroll 7 by a predetermined angle so that the fixed scroll 10 overlaps the fixed scroll 10 from the outer peripheral side while the orbiting scroll 7 orbits. A plurality of compression chambers 11, 1 that continuously shrink toward the inner peripheral side
It is designed to define 1, ...

Further, on the outer peripheral side of the fixed scroll 10, two suction ports 12, 12 communicating with the outermost compression chamber 11 via a suction passage 10D are formed, and the central portion of the fixed scroll 10 is formed. A discharge port 13 that communicates with the compression chamber 11 on the innermost peripheral side is formed therein.

Reference numeral 14 denotes an annular member provided on the other end side of the casing 1, and the annular member 14 is an orbiting scroll 7.
Located on the outer peripheral side of the end plate 7A of the casing 1 of the casing 1.
An annular member body 14A (hereinafter, referred to as a body 14A) sandwiched between B and the mounting cylinder portion 10C of the fixed scroll 10.
And a thrust receiving portion 14B which projects radially inward from the inner peripheral side of the main body 14A so as to be in sliding contact with the front surface side of the mirror plate 7A and receives the load in the thrust direction of the mirror plate 7A. The main body 14A is generally configured by an annular oil sump 14D which extends from the other end on the inner peripheral side toward the other side and has a weir 14C whose distal end projects radially inward.
Further, an oil passage hole 14E is formed on the lower end side of the main body 14A and extends upward from the lower end, and the tip end side is open to the lower end side in the oil sump 14D. The oil sump 14D is formed on the upper end side.
An introduction hole 14F for introducing the atmosphere is provided therein.

As shown in FIG. 2, the annular member 14 receives the load in the thrust direction of the orbiting scroll 7 at the thrust receiving portion 14B, and the end plate 7A of the orbiting scroll 7 and the thrust receiving portion 14B. The lubricating oil 2 that leaked to the fixed scroll 10 side through the gap between
Is blocked by the weir 14C and captured in the oil sump 14D, and the leaked oil 2 is returned from the oil passage hole 14E to the casing 1 through the return pipe 16.

Reference numeral 15 denotes a seal member which is located on the outer peripheral side of the end plate 10A of the fixed scroll 10 and is provided between the orbiting scroll 7 and the annular member 14 so as to block the oil sump 14D from each compression chamber 11. The seal member 15 is flexible so as to allow the orbiting scroll 7 to orbit, and is made of a polymer material such as a rubber material or a resin material and has a cross section U.
It is formed in a letter shape, and the inside and the outside are fixed to the cylindrical projection 7C of the orbiting scroll 7 and the oil sump 14D of the annular member 14, respectively.

Reference numeral 16 denotes an oil passage hole 14 of the annular member 14 on the base end side.
Shown is a return pipe connected to E via a plug 16A and having a tip end side connected to a connection hole 1D of the casing 1 via a plug 16B. The return pipe 16 was captured by an oil sump 14D of the annular member 14. The leaked oil 2 is returned to the casing 1.

Reference numeral 17 denotes an oil scraper located at an axially intermediate portion of the drive shaft 4 and arranged at the other end side in the casing 1. The oil scraper 17 has its tip end side housed in the casing 1. It is arranged so as to come into contact with the lubricating oil 2, and thereby scrapes up the lubricating oil 2 to lubricate the bearings 5, 6, 8 and the end plate 7A of the orbiting scroll 7 and the thrust receiving portions 3, 14B. , These components are designed to be cooled. Further, the counterweight 1 is located on the tip side of the oil scraper 17 on the side opposite to the eccentric direction of the crank portion 4A of the drive shaft 4.
8 is fixed, and the counterweight 18 balances the rotation of the drive shaft 4.

Reference numeral 19 denotes a cap attached to the oil filling hole 1E of the casing 1, and the cap 19 is the oil filling hole 1E.
While E is closed, the inside of the casing 1 is opened to the atmosphere through the ventilation hole 19A.

The scroll type air compressor according to this embodiment has the above-mentioned structure, and its operation will be described below.

First, when the drive shaft 4 is rotationally driven by the electric motor, this rotation is transmitted from the crank portion 4A to the orbiting scroll 7 via the bearing 8. As a result, the orbiting scroll 7 has a dimension d about the axis of the drive shaft 4.
Of the fixed scroll 10 through the respective suction ports 12.
External air is sucked into the compression chamber 11 on the outermost peripheral side through the compression chamber 11, and the compressed air is compressed from the compression chamber 11 on the innermost peripheral side via the discharge port 13 while being sequentially compressed in the compression chamber 11. Discharge to a tank etc.

The lubricating oil 2 stored in the casing 1 at this time is the oil scraper 1 which is rotationally driven together with the drive shaft 4.
It is scraped up into the casing 1 by the bearing 7,
6, 8 and the orbiting scroll 7 are cooled and lubricated.

Of the lubricating oil 2 that lubricates the orbiting scroll 7, the lubricating oil 2 supplied between the end plate 7A of the orbiting scroll 7 and the thrust receiving portion 3 is the same as the end plate 7A and the thrust receiving portion 3. It hangs down from between and is returned to the inside of the casing 1 through the oil hole 3A of the thrust receiving portion 3.

On the other hand, a part of the lubricating oil 2 supplied between the end plate 7A and the thrust receiving portion 14B of the annular member 14 drops from the end between the end plate 7A and the thrust receiving portion 14B to form the end plate 7A. Lubricating oil 2 supplied between thrust receiving portion 3
At the same time, it is returned into the casing 1 and a part thereof leaks from the inner peripheral side of the thrust receiving portion 14B to the fixed scroll 10 side by the orbiting movement of the orbiting scroll 7. Then, the leaked oil 2 leaking to the fixed scroll 10 side is blocked by the weir 14C and captured in the oil sump 14D, and the oil sump 1
4D is discharged to the one end side (near the lid portion 1A) in the casing 1 through the oil passage hole 14E and the return pipe 16 and returned.

Thus, in this embodiment, the leaked oil 2 leaking to the side of the fixed scroll 10 can be blocked by the weir 14C of the annular member 14 and captured in the oil sump 14D, and the oil in the oil sump 14D can be captured. Since the leaked oil 2 can be returned to the inside of the casing 1 through the return pipe 16 or the like, the leaked oil 2 leaked to the fixed scroll 10 side can be prevented from entering the compression chambers 11 and the discharge port 13 The compressed air discharged can be cleaned.

A seal member 15 is provided between the orbiting scroll 7 and the annular member 14 to shut off the oil sump 14D from the compression chambers 11, so that the oil sump 14D is trapped in the oil sump 14D by vibration or the like. Oil leak 2 is fixed scroll 10
Even if it leaks to the side, the leaked oil 2 can be prevented from entering the compression chambers 11, and the clean air can be more reliably secured.

Further, since the leaked oil 2 trapped in the oil sump 14D is discharged to one end of the casing 1 through the return pipe 16 and the like, the air compressor is fixed during assembly and transportation. Even if the liquid surface of the lubricating oil 2 is tilted toward the scroll 10 side and is indicated by a chain double-dashed line in FIG.
Can be prevented from flowing back to the oil sump 14D side through the return pipe 16 and overcoming the weir 14C and overflowing to the seal member 15 side. As a result, the seal member 15 becomes oil-immersed at an early stage. It is possible to prevent damage, and to prevent damage to the bearings 5, 6, 8 and the sliding surface of the orbiting scroll 7 due to poor lubrication due to a decrease in the amount of lubricating oil 2 and to effectively damage each part. Therefore, it is possible to prolong the service life. Also, since there is no concern about leakage of lubricating oil during assembly and transportation, work efficiency can be improved and productivity can be significantly improved.

Next, FIGS. 3 and 4 show a second embodiment of the present invention, which is characterized in that the return pipe is opened through the casing near one end side. In addition,
In this embodiment, the same components as those in the first embodiment shown in FIGS. 1 and 2 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 21 denotes a return pipe according to this embodiment, which is used in place of the return pipe 16 according to the first embodiment, and the return pipe 21 has a connecting pipe portion 22 to be described later.
And a discharge pipe portion 23.

First, as shown in FIG. 4, reference numeral 22 denotes a connecting pipe portion provided between the annular member 14 and the casing 1. As shown in FIG. 4, the connecting pipe portion 22 has an annular base end side. The oil scraper 1 is connected to the oil passage hole 14E of the member 14 via the plug 21A, and the tip side is located at the other end surface of the casing 1.
It is connected via a plug 21B to a connection hole (not shown) formed on the outer peripheral side of the rotation radius of 7 and on the side where the oil scraper 17 projects into the oil surface in the rotation direction.

Reference numeral 23 denotes a discharge pipe portion which is provided in the casing 1 and constitutes the return pipe 21 together with the connection pipe portion 22,
The base end side of the discharge pipe portion 23 is connected to the connection hole of the casing 1 and communicates with the connection pipe portion 22, and the tip end side extends toward one side and opens near the one end side in the casing 1. is doing.

Then, the return pipe 2 constructed in this way
1 is similar to the return pipe 16 described in the first embodiment, when the leaked oil 2 captured by the oil sump 14D of the annular member 14 flows into the connection pipe portion 22 from the oil passage hole 14E,
The leaked oil 2 is circulated from the connection pipe portion 22 to the discharge pipe portion 23, discharged from the tip of the discharge pipe portion 23, and returned into the casing 1.

Thus, although the present embodiment thus constructed can obtain substantially the same operational effect as the first embodiment, in particular, in the present embodiment, the return pipe 21 is provided.
Is composed of the connection pipe portion 22 and the discharge pipe portion 23, and the discharge pipe portion 23 is configured to pass through the casing 1. Therefore, the total length of the return pipe 21 can be shortened, and the workability during piping work can be improved. Moreover, the manufacturing cost can be reduced.

Further, in the case of this embodiment, during operation, the oil surface in the casing 1 is higher on the side scraped up by the oil scraper 17 and lower on the side into which the oil scraper 17 plunges. That is, since the opening portion of the discharge pipe portion 23 is located on the lower oil surface side, the backflow of the lubricating oil 2 from the discharge pipe portion 23 can be prevented more reliably.

Next, FIG. 5 shows a third embodiment of the present invention. The feature of this embodiment is that the weir of the annular member and the cylindrical projection of the orbiting scroll form a seal member. In the present embodiment, the first shown in FIG. 1 and FIG.
The same components as those of the embodiment are given the same reference numerals and the description thereof will be omitted.

In the figure, reference numeral 31 denotes a revolving scroll according to the present embodiment, which is rotatably provided on the other end side of the casing 1. The revolving scroll 31 has a disc-shaped end plate 31A and the end plate 31A. Spiral wrap portion 31B that is erected upright, and a cylindrical tubular projection portion 31C that is erected on the end plate 31A so as to surround the outer peripheral side of the wrap portion 31B.
And a boss portion (not shown) provided at the center of the rear surface of the end plate 31A, and each Oldham coupling 9 is located on the outer peripheral side of the boss portion on the rear surface of the end plate 31A. Multiple connected keyways 31D (only one shown)
Are formed at predetermined intervals in the circumferential direction. In addition, a seal groove 31E that opens toward the other side is formed on the outer peripheral side of the front surface of the end plate 31A over the entire circumference, and in the same manner as the seal groove 31E is formed on the tip end side of the tubular projection 31C. And a seal groove 31F is formed.

Reference numeral 32 denotes a fixed scroll according to the present embodiment which is provided on the other end side of the casing 1 so as to face the orbiting scroll 31, and the fixed scroll 32 is provided.
Is a mirror plate 32A disposed in the central portion, a spiral wrap 32B that is erected on the mirror plate 32A in the same manner as the wrap 31B of the orbiting scroll 31, and is located on the outer peripheral side of the mirror plate 32A. It is generally configured by a tubular mounting tubular portion 32C which extends to one side and is fixed to a tubular portion 1B of the casing 1 via an annular member 34 described later, and a suction port 33 is formed on the outer peripheral side of the end plate 32A. Has been done.

Reference numeral 34 denotes an annular member according to the present embodiment provided on the other end side of the casing 1, and the annular member 34 is sandwiched between the tubular portion 1B of the casing 1 and the mounting tubular portion 32C of the fixed scroll 32. The annular member main body 34A (hereinafter,
A main body 34A) and a thrust receiving member that projects radially inward from the inner peripheral side of the main body 34A so as to be in sliding contact with the front surface side of the end plate 31A, and receives the load in the thrust direction of the end plate 31A. The part 34B and the other end of the main body 34A on the inner circumference side extend toward the other side, and the tip end side extends radially inward to form a weir 34C in sliding contact with the tip end of the cylindrical projection 31C of the orbiting scroll 31. The main body 34A is provided with an oil passage hole 34E that extends upward from the lower end and has its tip end side open to the lower end side in the oil sump 34D.

Reference numeral 35 is a seal groove 31 of the orbiting scroll 31.
A face seal that is inserted into E and seals liquid-tight between the end plate 31A and the thrust receiving portion 34B of the annular member 34,
Reference numeral 36 denotes a face seal that is inserted into the seal groove 31F of the orbiting scroll 31 and liquid-tightly seals between the cylindrical projection 31C and the weir 34C of the annular member 34. The face seals 35 and 36 are , The end plate 31A of the orbiting scroll 31, the cylindrical protrusion 31C, the weir 34C of the annular member 34,
Together with the oil sump 34D, a seal member that shuts off the inside of the oil sump 34D from each compression chamber 11 is configured.

Thus, in this embodiment having the above-described structure, substantially the same effects as those of the above-described embodiments can be obtained. However, particularly in this embodiment, the end plate 31A of the orbiting scroll 31 and the cylindrical shape are formed. Projection 31C, annular member 34
Weir 34C, oil sump 34D, face seals 35, 36
Since the seal member is configured from the above, the seal member can be made compact and the axial dimension of the fixed scroll 32 can be made small, and the scroll air compressor can be made significantly smaller. In addition, the number of parts can be reduced, workability at the time of assembling can be improved, and cost can be reduced.

Next, FIGS. 6 to 8 show a fourth embodiment of the present invention, which is characterized in that the leaked oil is returned to the casing without using an external pipe. . In this embodiment, the same components as those in the first embodiment shown in FIGS. 1 and 2 described above are designated by the same reference numerals,
The description will be omitted.

In the figure, reference numeral 41 denotes a orbiting scroll according to this embodiment which is provided on the other end side of the casing 1 so as to be capable of orbiting, and the orbiting scroll 41 is the cylindrical projection 7C described in the first embodiment. A disk-shaped end plate 41A similar to the orbiting scroll 7 except that it is different in the presence or absence of
And a spiral wrap portion 41B erected on the end plate 41A
And a boss portion 4 provided at the center of the rear side of the end plate 41A.
1C and the end plate 4 located on the outer peripheral side of the boss portion 41C.
1A and is composed of a plurality of keyways 41D, 41D (only two shown) to which the Oldham couplings 9 are connected.

Reference numeral 42 denotes a fixed scroll according to the present embodiment, which is provided at the other end of the casing 1 so as to face the orbiting scroll 41. The fixed scroll 42
Is an end plate 42A disposed in the central part so that the center thereof coincides with the axis of the drive shaft 4, and a spiral wrap part that is erected on the end plate 42A similarly to the wrap part 41B of the orbiting scroll 41. 42B and a cylindrical mounting cylinder 42C that is located on the outer peripheral side of the end plate 42A and extends to one side and is fixed to the cylinder 1B of the casing 1 via an annular member 45 described later. There is.

Further, on the outer peripheral side of the fixed scroll 42, two suction ports 43, 43 communicating with the compression chamber 11 on the outermost peripheral side are formed. Discharge port 44 communicating with the compression chamber 11 on the side
Are formed.

Reference numeral 45 denotes an annular member according to the present embodiment provided on the other end side of the casing 1. The annular member 45 is similar to the annular member 14 described in the first embodiment, and the orbiting scroll 41 is provided. The annular member main body 45A (hereinafter, referred to as “the end plate 41A”) sandwiched between the tubular portion 1B of the casing 1 and the mounting tubular portion 42C of the fixed scroll 42 located on the outer peripheral side of
The main body 45A) and a thrust receiving member that is radially inwardly projected from the inner peripheral side of the main body 45A so as to be in sliding contact with the front surface side of the end plate 41A and receives the load in the thrust direction of the end plate 41A. Although it is roughly composed of a portion 45B and an annular oil sump 45D which extends from the other end on the inner peripheral side of the main body 45A toward the other side and has a tip side which is a weir 45C protruding inward in the radial direction, The oil passage hole 45E of the annular member 45 is formed so as to axially penetrate the lower end outer peripheral side of the thrust receiving portion 45B, and the return passage is formed by the oil passage hole 45E and the oil hole 3A of the thrust receiving portion 3. It is designed to be configured.

The annular member 45 receives the load in the thrust direction of the orbiting scroll 41 at the thrust receiving portion 45B, and through the gap between the end plate 41A of the orbiting scroll 41 and the thrust receiving portion 45B. The leaked oil 2 leaked to the fixed scroll 42 side is blocked by the weir 45C to be trapped in the oil sump 45D, and the leaked oil 2 is stored in the casing 1 through the oil passage hole 45E and the oil hole 3A of the thrust receiving portion 3. It will be returned to.

Reference numerals 46 and 47 denote face seals provided on the other end surface side of the end plate 41A of the thrust receiving portion 3 and the orbiting scroll 41, respectively.
47 is the end plate 41A, the thrust receiving portion 3, the annular member 4
5 and the thrust receiving portion 45B of No. 5 are liquid-tightly sealed.

As shown as a modified example in FIG. 8, the face seals 46 'and 47' are attached to the end plate 41A and the annular member 4.
5 may be provided on one end surface side of the thrust receiving portion 45B.

Thus, although the present embodiment having such a configuration can obtain substantially the same operational effects as the above-described respective embodiments, in particular, in the present embodiment, external pipes and the like are eliminated and more parts are provided. The number of points can be reduced, the workability can be greatly improved, and the manufacturing cost can be reduced.

Next, FIG. 9 shows a fifth embodiment of the present invention. The feature of this embodiment is that the leak oil is surely prevented from entering the compression chambers by the seal member while reducing the number of parts. There is something I did. In addition, in the present embodiment, FIG.
The same components as those in the fourth embodiment shown in FIG. 8 are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 51 denotes an orbiting scroll provided on the other end side of the casing 1 so as to be able to orbit, and the orbiting scroll 51 is the same as the orbiting scroll 7 described in the first embodiment. In addition, a disc-shaped end plate 51A, a spiral wrap portion 51B erected on the end plate 51A, and a cylinder erected on the end plate 51A so as to surround the outer peripheral side of the wrap portion 51B. Cylindrical protrusion 51C
And a boss portion (not shown) provided at the center of the rear side of the end plate 51A, and each Oldham coupling 9 is located on the outer peripheral side of the boss portion on the rear side of the end plate 51A. A plurality of key grooves 51D (only one is shown) to be connected are formed at predetermined intervals in the circumferential direction.

Reference numeral 52 denotes a fixed scroll according to the present embodiment which is provided on the other end side of the casing 1 so as to face the orbiting scroll 51.
Like the fixed scroll 10 described in the first embodiment, the end plate 52A is disposed in the central portion so that its center coincides with the axis of the drive shaft 4, and the orbiting scroll 51 is attached to the end plate 52A. The spiral wrap portion 52B, which is erected in the same manner as the wrap portion 51B, is located on the outer peripheral side of the end plate 52A, extends to one side, and is fixed to the tubular portion 1B of the casing 1 via the annular member 45. And an annular suction passage 52D are formed on the inner peripheral side of the mounting tubular portion 52C.

A suction port 53 is formed on the outer peripheral side of the fixed scroll 52 so as to communicate with the outermost peripheral compression chamber 11 via a suction passage 52D.
A discharge port (not shown) that communicates with the innermost peripheral compression chamber 11 is formed in the center of 2.

Reference numeral 54 denotes a seal member which is located on the outer peripheral side of the end plate 52A of the fixed scroll 52 and is provided between the orbiting scroll 51 and the annular member 45 so as to block the oil sump 45D from each compression chamber 11. , The seal member 54 is
It is flexible so as to allow the orbiting scroll 51 to orbit, and is formed of a polymeric material such as a rubber material or a resin material in a U-shaped cross section. The portion 51C is fixed to the oil sump 45D of the annular member 45.

Thus, although the present embodiment thus constructed can obtain substantially the same operational effects as the above-mentioned respective embodiments, in particular, in the present embodiment, as in the case of the fourth embodiment, it is possible to obtain an external effect. While the number of parts is further reduced by eliminating the piping and the like, it is possible to reliably prevent the leaked oil 2 from entering the compression chambers 11 by providing the seal member 54, and improve workability. The reliability can be improved.

Next, FIG. 10 shows a sixth embodiment of the present invention. The feature of this embodiment is that a scattering prevention means is provided between the inner peripheral side of the annular member and the inner peripheral end side of the seal member. The purpose is to prevent the seal member from being damaged by oil, and to prevent the leaked oil from entering the compression chambers even when the seal member is damaged. In this embodiment, the same components as those in the fifth embodiment shown in FIG. 9 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 61 denotes an annular member according to the present embodiment provided on the other end side of the casing 1. The annular member 61 is located on the outer peripheral side of the end plate 51A of the orbiting scroll 51 and is a cylinder of the casing 1. Part 1B and fixed scroll 5
The annular member body 6 sandwiched between the second mounting cylinder portion 52C and the second mounting cylinder portion 52C.
1A (hereinafter referred to as the main body 61A) and a radially inward projection so as to be in sliding contact with the inner peripheral side of the main body 61A and the front side of the end plate 51A so as to receive the load in the thrust direction of the end plate 51A. The thrust receiving portion 61B and the two weirs 61C, 61C that extend inward from the other end on the inner peripheral side of the main body 61A and project radially inward toward the tip end are parallel to each other with a predetermined distance therebetween. The leaked oil 2 trapped between the weirs 61C is provided on the outer peripheral side of the lower end of the weir 61C located on one side of the weirs 61C. A circulation hole 61E is provided for circulation to the first side. Further, the inner peripheral end side of each of the weirs 61C is bent to one side so that the leaked oil 2 can be effectively stopped. Further, an oil passage hole 61E which forms a return passage together with the circulation hole 61E and the oil hole 3A of the thrust receiving portion 3 is formed on the outer peripheral side of the lower end of the thrust receiving portion 61B so as to penetrate in the axial direction.

Reference numeral 62 denotes a seal member which is located on the outer peripheral side of the end plate 52A of the fixed scroll 52 and is provided between the orbiting scroll 51 and the annular member 61 so as to block the oil sump 61D from each compression chamber 11. , The seal member 62 is
It is flexible so as to allow the orbiting scroll 51 to orbit, and is formed of a polymeric material such as a rubber material or a resin material in a U-shaped cross section. The portion 51C is fixed to the oil sump 61D of the annular member 61. Further, the seal member 62 is located on the inner peripheral end side and protrudes outward in the radial direction so as to overlap with one side of each dam 61C of the annular member 61, and each dam 6C.
An annular shield plate 62 that constitutes a scattering prevention means together with 1C.
A and 62A are integrally provided.

The seal member 62 is the annular member 6
The oil sump 61D of No. 1 is shut off from each compression chamber 11, and the shielding plate 62A closes the inner peripheral side of each weir 61C, so that the leaked oil 2 trapped in the oil sump 61D scatters and the seal member 62 It prevents it from entering inside.

Thus, although the present embodiment having such a configuration can obtain substantially the same operational effects as the above-described respective embodiments, in particular, in the present embodiment, the annular member 61 is provided with two weirs 61C. In addition, since the inner peripheral side of each weir 61C is closed by each shielding plate 62A of the seal member 62, the leaked oil 2 trapped in the oil sump 61D scatters and enters the seal member 62 side. Can be prevented and the sealing member 6
It is possible to prevent deterioration due to oil 2 and extend the life. Further, even if the seal member 62 is damaged, the leakage oil 2
Can be prevented from entering the compression chambers 11, and the reliability of the air compressor can be greatly improved.

Next, FIG. 11 shows a seventh embodiment of the present invention, which is characterized in that a suction member for adsorbing oil is attached to each shielding plate of the seal member. In this embodiment, the same components as those of the sixth embodiment shown in FIG. 10 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 71 and 71 are seal members 62.
Each of the shielding plates 62A is an adsorbing member fixed to one side surface as a scattering prevention means, and each adsorbing member 71 is formed of an adsorbent such as felt in an annular shape in accordance with the shape of each shielding plate 62A. There is. Then, each of the adsorbing members 71 adsorbs the scattered leaked oil 2 when the leaked oil 2 captured in the oil sump 61D of the annular member 61 is scattered.

Thus, although the present embodiment having such a configuration can obtain substantially the same operational effects as the above-mentioned respective embodiments, particularly in the present embodiment, the scattered leaked oil 2
Therefore, the leaked oil 2 can be more reliably prevented from corroding the seal member 62.

In each of the above-mentioned embodiments, the scroll type air compressor has been described as an example, but the present invention is not limited to this, and may be used for compressing a fluid such as a refrigerant,
It may be applied to a scroll type fluid machine such as a vacuum pump.

[0077]

As described above in detail, according to the present invention, between the casing and the fixed scroll is located on the outer peripheral side of the orbiting scroll, and among the lubricating oils housed in the casing, the fixed scroll is located on the fixed scroll side. Since the oil sump for catching the leaked leaked oil is provided and the return passage for returning the leaked oil in the oil sump into the casing is provided between the oil sump and the casing, it is housed in the casing. Among the lubricating oil, while trapping the leaked oil that has leaked to the fixed scroll side via the space between the orbiting scroll and the casing by the oil sump, it can be returned from the oil sump into the casing via the return passage, Leakage oil can be prevented from entering the compression chambers, and a fluid such as clean compressed air can be discharged from the discharge port to improve the reliability of the scroll fluid machine.

Further, a seal member is provided between the casing or the fixed scroll and the orbiting scroll, the seal member being located on the fixed scroll side with respect to the oil sump to shut off the inside of the casing from the compression chambers. Since the oil sump is surrounded, the leaked oil trapped in the oil sump can be prevented from entering the compression chambers, and the lubricating oil in the casing will leak to the outside even if it leans during transportation. Can be prevented.

Further, the return pipe is connected to the casing such that the base end side is connected to the oil sump and the tip end side is opened near the one end side in the casing. The stored lubricating oil can be prevented from flowing back into the oil sump, and the handling can be facilitated.

Furthermore, since a splash prevention means is provided between the oil sump and the fixed scroll to prevent the leaked oil trapped in the oil sump from scattering in each compression chamber, the oil sump inside the oil sump is prevented. It is possible to prevent the leaked oil trapped in the air from scattering and entering the compression chambers.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a scroll type air compressor according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing an enlarged main part in FIG.

FIG. 3 is a vertical cross-sectional view showing a scroll type air compressor according to a second embodiment of the present invention at the same position as in FIG.

FIG. 4 is an external view showing the scroll air compressor in FIG. 3 from the fixed scroll side.

FIG. 5 is a vertical cross-sectional view showing a scroll type air compressor according to a third embodiment of the present invention at the same position as in FIG.

FIG. 6 is a vertical sectional view similar to FIG. 1, showing a scroll air compressor according to a fourth embodiment of the present invention.

FIG. 7 is an enlarged vertical sectional view showing an arrow A portion in FIG.

FIG. 8 is a vertical cross-sectional view showing a modified example of the fourth embodiment at the same position as in FIG.

FIG. 9 is a vertical cross-sectional view showing a scroll type air compressor according to a fifth embodiment of the present invention at the same position as in FIG.

FIG. 10 is a longitudinal sectional view showing the scroll air compressor according to the sixth embodiment of the present invention at the same position as in FIG.

FIG. 11 is a vertical cross-sectional view showing a scroll type air compressor according to a seventh embodiment of the present invention at the same position as in FIG.

[Explanation of symbols]

1 Casing 1C Bearing part 2 Lubricating oil (leakage oil) 4 Drive shaft 4A Crank part 7,31,41,51 Orbiting scroll 7A, 10A, 31A, 32A, 41A, 42A, 51
A, 52A End plate 7B, 10B, 31B, 32B, 41B, 42B, 51
B, 52B Wrap portion 10, 32, 42, 52 Fixed scroll 11 Compression chamber 12, 33, 43, 53 Suction port 13, 44 Discharge port 14, 34, 45, 61 Annular member 14D, 34D, 45D, 61D Oil sump 15 , 54, 62 Sealing member 16, 21 Return pipe 31C Cylindrical projection (sealing member) 34B Thrust receiving portion (sealing member) 34C Weir (sealing member) 35, 36 Face seal (sealing member) 62A Shielding plate (scattering prevention means) ) 71 Adsorption member (scattering prevention means)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical indication location F04C 29/02 311 E 6907-3H 361 A 6907-3H (72) Inventor Koji Fukui Kawasaki City, Kanagawa Prefecture 1-6-3 Fujimi, Kawasaki-ku Tokiko Co., Ltd. (72) Inventor Yoshio Kobayashi 1-3-6 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Tokiko Co., Ltd.

Claims (4)

[Claims] 1. A cylindrical casing having one end side closed as a bearing part and closed at the other end side, and a bearing part of the casing rotatably rotatably supported by a bearing part, and a front end side serving as a crank part in the casing. A drive shaft, an orbiting scroll located inside the casing so as to be capable of orbiting on a crank portion of the drive shaft, and an orbiting scroll in which a spiral wrap portion is erected on an end plate, and the casing so as to face the orbiting scroll. Formed between the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll, which is provided on the other end side of the fixed scroll in which a spiral wrap portion that overlaps the wrap portion of the orbiting scroll is erected on the end plate. In the scroll type fluid machine, which comprises a plurality of compression chambers for sequentially compressing the fluid sucked through the suction port and discharging the fluid through the discharge port, An oil sump, which is located on the outer peripheral side of the orbiting scroll between the rolls and traps the leaked oil leaked to the fixed scroll side among the lubricating oil accommodated in the casing, is provided between the oil sump and the casing. A scroll-type fluid machine characterized in that a return passage for returning the leaked oil in the oil sump into the casing is provided therebetween. 2. A seal member is provided between the casing or the fixed scroll and the orbiting scroll, the seal member being located closer to the fixed scroll than the oil sump to shut off the inside of the casing from the compression chambers. The scroll fluid machine according to claim 1, wherein the oil sump is surrounded by a seal member. 3. The return passage is constituted by a return pipe connected to the casing such that a base end side is connected to the oil sump and a tip end side is opened near the one end side in the casing. Alternatively, the scroll type fluid machine described in 2. 4. A scattering prevention means is provided between the oil sump and the fixed scroll to prevent leakage oil trapped in the oil sump from scattering into each compression chamber.
Alternatively, the scroll type fluid machine described in 3 above.