JPH08151990A - Scroll fluid device - Google Patents

Abstract

PURPOSE: To attain reducing a cost of a compressor by enabling lubricating oil to separate even without using a demister against a mixed fluid formed by mixing lubricating oil in refrigerant gas, in the case of using an HFC refrigerant and fluorin lubricating oil in a scroll type compressor for a refrigerating machine. CONSTITUTION: A device comprises an internal delivery pipe 21 arranged in a high pressure chamber 4 positioned internally upward a closed casing 1 to turn around an axial center P in the high pressure chamber 4 a mixed fluid delivered from a scroll mechanism part and an oil return passage 22 opening the upper end to a position in the vicinity of a side wall surface in a bottom wall surface of the high pressure chamber 4 on the other hand to open the lower end toward an oil reservoir part positioned internally downward the casing 1.

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 device used as a compressor for a refrigerator, and more particularly to a measure for separating lubricating oil mixed in a working gas.

[0002]

2. Description of the Related Art For example, in a scroll type compressor for a refrigerator, as known from Japanese Patent Laid-Open No. 5-321856, a scroll mechanism portion for compressing and discharging a refrigerant gas is provided inside a hermetically sealed casing. , And a drive mechanism portion that drives the scroll mechanism portion, respectively. The scroll mechanism section includes a fixed scroll and an orbiting scroll in which spiral wraps are erected on the end plate and are arranged in a state where the opposing wraps are meshed with each other. In this example, each is composed of a pair of upper and lower fixed scrolls having wraps on one side of the end plate, and one orbiting scroll arranged between the fixed scrolls and having wraps on the upper and lower sides of the end plate respectively. The drive mechanism section is rotatably supported about an axis, and a crankshaft section having an eccentric axis is connected to the revolving scroll via an auxiliary member. And an electric motor that rotationally drives.

The revolution scroll is orbitally driven around the axis of the fixed scroll and its rotation is restricted to form a working chamber on the outer peripheral end side between the two wraps, and this working chamber is a scroll mechanism. The refrigerant gas is taken in from the outer space of the portion and is contracted when moving from the outer peripheral end side toward the inner peripheral end side to compress the refrigerant gas. The refrigerant gas compressed by the scroll mechanism is discharged to the high pressure chamber and then discharged from the casing to the outside.

On the other hand, in the oil sump portion provided in the lower portion of the casing, for example, the lubricating oil is sucked up by an oil pump provided at the lower end portion of the rotary drive shaft, and each oil is passed through an oil passage in the rotary drive shaft. It is supplied to the sliding part, but especially in the scroll mechanism part, it is taken into the working chamber together with the refrigerant gas, and thus it acts to enhance the sealing effect of the wrap tip so that the volumetric efficiency of the working chamber is maintained high. .

By the way, when the lubricating oil is discharged together with the refrigerant gas discharged from the compressor, the lubricating oil reduces the efficiency of the heat exchanger of the refrigerator. Not only that, if the lubricating oil flows out, the lubricating oil in the oil sump will be insufficient, and the reliability of the machine will be reduced. Therefore, conventionally, a demister (oil separator) is arranged at the discharge port of the communication passage leading from the scroll mechanism portion to the high pressure chamber, whereby the lubricating oil is separated from the refrigerant gas.

[0006]

However, in the above-mentioned conventional example, since the demister is used, there is a problem that the cost of the device is increased.

The present invention has been made in view of the above circumstances, and an object thereof is to enable sufficient separation of lubricating oil without using a demister, which reduces the cost of the scroll type fluid device. Is to be able to achieve.

[0008]

In order to achieve the above object, in the invention of claim 1, the specific gravity of the lubricating oil is larger than that of the working gas, and the momentum when the mixed fluid is discharged into the high pressure chamber. Using the above, the mixed fluid was swirled in the high pressure chamber to centrifuge the lubricating oil.

Specifically, according to the present invention, as shown in FIG. 2, a fixed scroll (6) having a spiral wrap (6b) on the mirror plate (6a) has a spiral shape on the mirror plate (7a). The orbiting scroll (7) with the lap (7b) of
Working chamber (2a) between opposing laps (6b), (7b)
Is formed so as to be capable of revolving around the axis (P) and non-rotatable in a state of forming a circle. A scroll mechanism (2) adapted to reduce the volume of the working chamber (2a) while moving the working chamber (2a) in a spiral shape toward the axis (P), and the orbiting scroll (7). And a drive mechanism section for causing the mixed fluid obtained by mixing the lubricating oil in the working gas to be taken into the working chamber (2a) and compressing and discharging the mixed fluid in the working chamber (2a). A high pressure chamber (4) for accommodating the scroll mechanism (2) and the drive mechanism (3) and storing the mixed fluid discharged from the scroll mechanism (2) is provided in the upper part of the inside. On the other hand, an oil sump for storing the above lubricating oil (5) is a scroll type fluid apparatus comprising a closed casing (1) provided in the downwardly a prerequisite.

Then, as shown in FIG. 1, the mixed fluid discharged from the scroll mechanism portion (2), which is disposed in the high pressure chamber (4), has a shaft center (P) in the high pressure chamber (4). And an inner discharge pipe (21) swirling around the upper end of the high pressure chamber (4) is opened at a position near the side wall surface of the bottom wall of the high pressure chamber (4), while a lower end is opened toward the oil sump (5). And an oil return passage (22).

According to a second aspect of the invention, the scroll type fluid device according to the first aspect of the invention is a compressor for a refrigerator, and the working gas thereof is a fluorohydrocarbon refrigerant (HFC).
Fluorine-based lubricating oil is used as the lubricating oil when a system-based refrigerant) is used.

The HFC-based refrigerant is, for example,
HFC-134a (1,1,1,2-tetrafluoroethane),
HFC-134 (1,1,2,2-tetrafluoroethane), H
FC-152a (1,1-difluoroethane), HFC-1
25 (pentafluoroethane), HFC-143a (1,
1,1-trifluoroethane), HFC-32 (difluoromethane) and the like. From the viewpoint of ozone layer protection, these HFC-based refrigerants are substitutes for refrigerants such as CFC-12 and CFC-22 containing chlorine. On the other hand, examples of the above-mentioned fluorine-based lubricating oil include FP
E oil (fluorinated pentaerythritol oil), 6FIS oil (6F trimer isostearyl oil), FEPM oil (fluorinated epoxy myristyl oil) and the like can be mentioned.

According to a third aspect of the present invention, in the first aspect of the invention, the mixed fluid compressed by the scroll mechanism portion (2) is introduced into the high pressure chamber (4) at the center of the bottom wall surface of the high pressure chamber (4). When the discharge port (20) for discharging is provided, the internal discharge pipe (21) is arranged so as to extend radially outward from the axis (P), and one end thereof is the discharge port (20). 20), while the other end is opened at a position near the side wall surface of the high pressure chamber (4) in the direction of swirling the mixed fluid.

According to a fourth aspect of the present invention, in the above-mentioned third aspect, the bottom wall surface of the high pressure chamber (4) is provided with a substantially tapered cross section which gradually decreases toward the outside in the radial direction. To do.

[0015]

With the above construction, in the invention of claim 1, when the mixed fluid compressed by the scroll mechanism portion (2) is discharged into the high pressure chamber (4), it passes through the internal discharge pipe (21). Revolving around the axis (P) in the high pressure chamber (4). At this time, since the specific gravity of the lubricating oil is larger than that of the working gas, the lubricating oil moves to the side wall surface side of the high pressure chamber (4) in accordance with the swirling and descends due to its own weight. Then, it returns from the position near the side wall surface of the bottom wall surface of the high pressure chamber (4) to the oil sump (5) via the oil return passage (22). Therefore, the lubricating oil is separated from the working gas without using a conventional demister, and the cost of the apparatus can be reduced accordingly.

According to the second aspect of the present invention, an HFC type refrigerant is used as the working gas, and a fluorine type lubricating oil is used as the lubricating oil. At that time, the fluorine-based lubricating oil,
Since the specific gravity of the lubricating oil is larger than that of other lubricating oils used in this type of compressor, the action of the invention according to claim 1 can be effectively performed and the oil can be efficiently separated.

In the invention of claim 3, the internal discharge pipe (2
Since the end of the high pressure chamber (4) on the side of the high pressure chamber (4) is opened in the vicinity of the side wall surface of the high pressure chamber (4) in the direction of swirling the mixed fluid, the mixed fluid swirls in the same direction. . As a result, the action of the invention of claim 1 is carried out specifically.

According to the fourth aspect of the invention, while the mixed fluid is swirling in the high pressure chamber (4), the lubricating oil is located closer to the shaft center (P) than the position near the side wall surface of the high pressure chamber (4). When it descends due to its own weight, the bottom wall surface of the high-pressure chamber (4) gradually lowers outward in the radial direction, so the lubricating oil flows down to the position near the side wall surface along the slope of this bottom wall surface, and the oil return passage (2
The upper end of 2) will be reached. Therefore, the lubricating oil separated from the working gas is efficiently returned to the oil sump (5).

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the scroll type fluid device is used as a compressor for a refrigerator and compresses and discharges a refrigerant gas as a working gas. Also, here, H
FC type refrigerant (fluorocarbon type refrigerant) is used, and fluorine type lubricating oil is used as lubricating oil.

FIG. 2 shows the overall structure of the scroll compressor according to this embodiment, and the compressor 2 has a vertically long closed casing (1). The upper side of the inside of the casing (1) serves as a low pressure chamber (19), and the low pressure chamber (1
A scroll mechanism portion (2) for compressing and discharging the refrigerant gas is provided inside 9). Further, a drive mechanism section (3) for operating the scroll mechanism section (2) is provided below the inside of the casing (1). Further, above the low pressure chamber (19), a high pressure chamber (4) for storing the refrigerant gas discharged from the scroll mechanism portion (2) is provided. On the other hand, the bottom of the casing (1) is provided with an oil sump (5) for storing the lubricating oil supplied to the sliding parts of the scroll mechanism (2) and the drive mechanism (3). ing.

In order to suck the refrigerant gas from the evaporator of the refrigerator into the outer space of the scroll mechanism section (2), the side wall of the closed casing (1) in which the scroll mechanism section (2) is arranged. The suction pipe (1a) is provided so as to project laterally. On the other hand, on the upper end wall of the casing (1), an external discharge pipe (1b) for discharging the high-pressure refrigerant gas in the high-pressure chamber (4) to the condenser of the refrigerator is provided so as to project upward. ing. In addition, "front / rear / left / right" in the following description means front / rear / left / right in FIG.

The scroll mechanism section (2) is arranged below the fixed scroll (6) fixed to the hermetic casing (1) and revolving with respect to the fixed scroll (6). An orbiting scroll (7) provided in the above and an Oldham section (8) which guides the orbiting scroll (7) with respect to the fixed scroll (6) so as to be able to revolve around an axis (P) extending in the vertical direction and not to rotate. ) And is composed of. The fixed scroll (6) comprises a disc-shaped end plate (6a) and a spiral (involute-shaped) wrap (6b) standing on the lower surface thereof, and its center (the center of the basic circle of the involute curve). ) Is aligned with the axis (P) and is mounted and fixed on the frame (9) fixed to the inner wall surface of the casing (1). Further, a discharge hole (6c) for discharging the refrigerant gas upward from the scroll mechanism portion (2) is provided at the center of the end plate (6a). On the other hand, the orbiting scroll (7) has a spiral shape (involute shape) on the upper surface of the disk-shaped end plate (7a).
The wrap (7b) of the fixed scroll (6) meshes with the wrap (7b) of the fixed scroll (6) with the center (Q) of the wrap (7b) eccentric from the axis (P). It is designed to do. Further, in the center of the lower surface of the revolution scroll (7), a bottomed cylindrical bearing recess (7c) is formed so as to open downward.

By these, the orbiting scroll (7)
Both the inner and outer peripheral wall surfaces of the wrap (7b) of the fixed scroll (6) mesh with the outer and inner peripheral wall surfaces of the wrap (6b) of the fixed scroll (6) at a plurality of positions in the spiral direction, and these contact parts A working chamber (2a) for compressing the refrigerant gas is formed therebetween. Then, when the revolution scroll (7) revolves around the axis (P) in the direction from the outer peripheral end of the wrap (7b) to the inner peripheral end, the working chamber (2a) causes both the wraps (6b) and (7b). Is formed from the outer peripheral edge side between
At that time, the refrigerant gas in the low pressure chamber (19) is transferred to the working chamber (2a).
It is taken in and moves in a spiral shape toward the axis (P),
The refrigerant gas is compressed due to the decrease in volume with the movement.

The Oldham portion (8) is interposed between the end plate (7a) of the orbiting scroll (7) and the opening edge of the recess (9a) provided on the upper surface of the frame (9).
The Oldham portion (8) has a substantially annular shape so as to surround the bearing recess (7c) of the orbiting scroll (7) in a loosely inserted state, and is supported so as to be horizontally slidable by the opening edge of the recess (9a). It has the Oldham ring (10). Frame keys (not shown) slidably in contact with the opening edge are provided at the front and rear of the diametrically opposite portion of the Oldham ring (10) so as to project radially outward. On the other hand, an annular raised portion (11) is formed at the opening edge, and the corresponding frame keys are provided only in the front-rear direction at two locations before and after the portion of the raised portion (11) corresponding to the frame key. A keyway for slidably guiding is provided. As a result, the Oldham ring (10) is movable with respect to the frame (5) only in the front-rear direction connecting both frame keys.

Further, scroll keys (10b) are provided so as to project upward at two locations in the left-right direction orthogonal to the direction in which both frame keys of the Oldham ring (10) are connected. On the other hand, each scroll key (10b) is provided on the lower surface of the end plate (7a) of the orbiting scroll (7).
Key grooves (7d) that engage with the scroll keys (10b) are respectively provided at two positions on the left and right of the region corresponding to, so as to extend in the left-right direction. As a result, the orbiting scroll (7) is movable with respect to the Oldham ring (10) only in the horizontal direction connecting the scroll keys (10b) and (10b).

Due to the Oldham section (8) constructed as described above, the revolution scroll (7) is restricted from rotating and only revolves around the axis (P). still,
An annular thrust bearing (12) slidably in contact with the lower surface of the end plate (7a) of the orbiting scroll (7) is disposed on the inner peripheral side of the upper surface of the raised portion (11).

The drive mechanism section (3) comprises a rotary drive shaft (13) rotatable about an axis (P), and an electric motor (14) for rotationally driving the rotary drive shaft (13). ing. The rotary drive shaft (13) penetrates the frame (9) in the up-down direction and is vertically moved by the frame (9).
It is rotatably supported via two cylindrical bearings (15) and (16). A portion near the upper end of the rotary drive shaft (13) is formed as a flange portion (13a) having a shape projecting outward in the radial direction over the entire circumference, and the lower surface of this flange portion (13a) is a frame (9). It is possible to slide on. further,
The upper end portion is a crank shaft portion (13b) provided so as to extend along an eccentric shaft center (Q) located at a position eccentric from the shaft center (P).
b) is located in the recess (9a) of the frame (9). The crankshaft portion (13a) is rotatably fitted around the eccentric axis (Q) in the bearing recess (7c) of the revolution scroll (7) via the cylindrical bearing (17). . In addition, the rotary drive shaft (13) is provided at a portion of the collar portion (13a) substantially opposite to the eccentric shaft center (Q) with respect to the shaft center (P).
Balancer (13c) for canceling the unbalance caused by the orbital movement of the orbiting scroll (6) when rotating.
Are provided integrally.

Although not shown, a centrifugal oil pump is provided at the lower end of the rotary drive shaft (13) and a predetermined amount of lubricating oil stored in the oil sump (5) is provided. It is designed to be immersed in. This rotary drive shaft (13)
An oil passage (not shown) reaching from the oil pump at the lower end to the upper end is provided inside the oil pump, and the upper end of the oil passage communicates with the low pressure chamber (19). As a result, the working fluid (2a) of the scroll mechanism portion (2) is adapted to take in the mixed fluid in which the lubricating oil is mixed in the refrigerant gas. Therefore, the refrigerant gas is in the state of the mixed fluid. Will be compressed and discharged. Further, from the oil passage, there are provided several branch passages extending in the horizontal direction to reach the side peripheral surface of the rotary drive shaft (13), and the sliding passages such as the bearings (15) to (17) are provided. Each is supplied with lubricating oil.

The fluorinated lubricating oil is specifically a FPE oil (fluorinated pentaerythritol oil) which is a mixture of two kinds of compounds represented by the following chemical formula 1.
Alternatively, 6FIS oil represented by Chemical Formula 2 (6F trimer isostearyl oil), FEPM oil represented by Chemical Formula 3 (fluorinated epoxy myristyl oil), or the like is used. Also,
In addition to such a fluorine-based lubricating oil, mineral oil or synthetic oil may be used in some cases.

[0030]

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[0031]

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[0032]

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The motor (14) includes a rotor (14a)
And a stator (14b). The rotor (14a) is fitted into the lower part of the rotary drive shaft (13) and is connected to be integrally rotated. On the other hand, the stator (1
4b) is annularly arranged on the inner wall surface of the casing (1) and is fixed by the frame (9).

The high pressure chamber (4) and the low pressure chamber (19) are
It is vertically divided by a partition plate (18) arranged horizontally above the inside of the casing (1). In the low pressure chamber (19), a low pressure refrigerant gas outside is supplied to the suction pipe (1a) of the casing (1) as the mixed fluid in the low pressure chamber (19) is taken into the scroll mechanism section (2). It is designed to flow in through. Partition plate (18)
Has a lower surface that forms a space between the lower surface and the upper surface of the end plate (6a) of the fixed scroll (6), which allows the fixed scroll (6) by the high pressure gas in the high pressure chamber (4). The end plate (6a) is prevented from being deformed. Further, a discharge port (20) for communicating the discharge hole (6c) of the scroll mechanism portion (2) with the high pressure chamber (4) is provided at the center of the partition plate (18). At this time, the discharge path of the mixed fluid from the discharge hole (6c) to the discharge port (20) is provided by the O-ring (23) interposed between the partition plate (18) and the fixed scroll (6) in the low pressure chamber. The airtightness with respect to (19) is maintained. Furthermore, partition boards (18)
Of the high pressure chamber (4), that is, the bottom wall surface of the high pressure chamber (4) is provided with a substantially tapered cross-section that gradually decreases outward in the radial direction.

As a feature of the present invention, the mixed fluid discharged from the scroll mechanism portion (2) is supplied to the high pressure chamber (4) around the axis (P) in the high pressure chamber (4). An internal discharge pipe (21) for swirling is arranged. Also,
Between the high pressure chamber (4) and the oil sump (5), an upper end is opened at a position near a side wall surface of a bottom wall surface of the high pressure chamber (4), while a lower end is the oil sump (5). An oil return passageway (22) is provided that is open toward.

Specifically, the internal discharge pipe (21) is arranged so as to extend horizontally outward from the axial center (P) in the radial direction. Then, after the end portion portion on the axial center (P) side is bent downward at the position of the axial center (P), the lower end thereof is fitted into the ejection port (20) so that the ejection port is closed. It is connected to (20). On the other hand, as shown in FIG. 2, the end portion on the outer peripheral side is bent at a position near the side wall surface of the high pressure chamber (4) so that the opening thereof faces, for example, the counterclockwise direction.

The oil return passage (22) is formed by a capillary provided so as to vertically penetrate the partition plate (18) and the frame (9). Then, the upper end thereof is opened flush with the bottom surface of the concave portion provided in the peripheral portion of the partition plate (18). The upper surface of the partition plate (18) has the steepest slope on the left side from the center of the bottom wall surface to the upper end of the oil return passage (22), as shown by the broken line in FIG. ), The taper shape is inclined with respect to the axis (P) so that the inclination on the right side in the direction extending outward in the radial direction becomes the gentlest.
As a result, the upper end of the oil return passage (22) is at the lowest position on the bottom wall surface.

Here, the operation of the scroll type compressor constructed as described above will be explained together with the movement paths of the refrigerant gas and the lubricating oil. The rotation drive shaft (1
When 3) is rotationally driven around the shaft center (P), the crankshaft portion (13b) rotates about the shaft center (P). Along with this, the revolution scroll (7) makes the same rotation, but since the rotation is restricted by the Oldham section (8), this rotation becomes a revolution movement around the axis (P). Then, the mixed fluid in the low pressure chamber (19) is taken into the working chamber (2a) and compressed.

At this time, the pressure of the low-pressure chamber (19) is reduced, so that the low-pressure refrigerant gas outside is sucked into the suction pipe (1).
While flowing into the low pressure chamber (19) via a),
The rotation of the rotary drive shaft (13) operates the oil pump to suck up the lubricating oil in the oil sump (5), and the lubricating oil is supplied to each sliding portion via the oil passage. Some of the lubricating oil is drawn into the low pressure chamber (19) from the upper end of the oil passage. Then, the mixed fluid is compressed in the working chamber (2a) to a high pressure, and the discharge hole (6c) of the fixed scroll (6), the discharge port (20) of the partition plate (18) and the internal discharge pipe (21). Is sequentially discharged to the high pressure chamber (4).

In the high-pressure chamber (4), the mixed fluid is swirled by the internal discharge pipe (21) as shown by the arrow in FIG. 1, and the swirling motion centrifugally separates the lubricating oil from the refrigerant gas. Then, the refrigerant gas from which the lubricating oil has been separated is discharged to the outside via the external discharge pipe (1b). On the other hand, the separated lubricating oil is returned to the oil sump (5) via the oil return passage (22).

Therefore, according to this embodiment, the mixed fluid compressed by the scroll mechanism portion (2) is discharged through the discharge port (2).
When the mixed fluid is discharged from the 0) into the high pressure chamber (4), it can be swirled around the axis (P) in the high pressure chamber (4) by the internal discharge pipe (21). Since the specific gravity of oil is larger than that of the refrigerant gas, the lubricating oil can be centrifuged. Therefore, the demister used in the conventional scroll compressor can be eliminated, and the cost of the compressor can be reduced accordingly.

At this time, since the upper surface of the partition plate (18) which constitutes the bottom wall surface in the high pressure chamber (4) is gradually lowered outward in the radial direction, the partition plate (18) is placed on the partition plate (18). The lubricating oil can be guided to the upper end position of the oil return passage (22), and thus the lubricating oil separated from the refrigerant gas can be efficiently returned to the oil sump (5).

Further, since a fluorine-based lubricating oil having a large specific gravity is used as the lubricating oil, CFC-12 or CFC is used.
Separation can be performed more efficiently than in the case of mineral oil used as a chlorine-containing refrigerant such as -22.

In the above embodiment, the scroll mechanism section (2) is provided with one fixed scroll (6) and one revolution scroll (7), but the structure of the scroll mechanism section is not limited to this. Alternatively, for example, a revolving scroll in which wraps are erected on both upper and lower surfaces may be arranged between a pair of fixed scrolls.

In the above embodiment, the scroll mechanism section (2) is arranged above the drive mechanism section (3). On the contrary, the scroll mechanism section is arranged below the drive mechanism section. The rotation drive shaft may penetrate the center of the revolution scroll.

Further, although the compressor for the refrigerator has been described in the above embodiment, the scroll type fluid device according to the present invention can be applied to a vacuum pump, an expander and the like.

[0047]

As described above, according to the first aspect of the present invention, when the mixed fluid in which the lubricating oil is mixed in the working gas is discharged from the scroll mechanism into the high pressure chamber, the mixed fluid is discharged. Since the lubricating oil is centrifugally separated by swirling in the high pressure chamber by the internal discharge pipe and the lubricating oil is returned to the oil sump by the oil return passage, the lubricating oil of The separation can be sufficiently performed, and the cost of the device can be reduced accordingly.

According to the invention of claim 2, when the scroll type fluid device according to the invention of claim 1 is a compressor of a refrigerator and an HFC type refrigerant is used as a working gas, a chlorine-containing refrigerant is used. Since the fluorine-based lubricating oil having a larger specific gravity than the lubricating oil used is used, the lubricating oil can be efficiently separated.

According to the third aspect of the present invention, the opening end of the internal discharge pipe on the high pressure chamber side is opened toward the direction in which the mixed fluid is swirled at a position near the side wall surface of the high pressure chamber. The effect of the invention of claim 1 can be obtained concretely.

According to the fourth aspect of the present invention, the bottom wall surface of the high pressure chamber is provided in a substantially tapered cross-section that gradually decreases outward in the radial direction. It can often be collected in the oil return passage and returned to the oil sump.

[Brief description of drawings]

FIG. 1 is a sectional view taken along line I-I of FIG.

FIG. 2 is a vertical sectional view showing a scroll compressor according to an embodiment of the present invention.

[Explanation of symbols]

 (1) Closed casing (2) Scroll mechanism (2a) Working chamber (3) Drive mechanism (4) High pressure chamber (5) Oil sump (6) Fixed scroll (6a) End plate (6b) Wrap (7) Revolution Scroll (7a) End plate (7b) Wrap (20) Discharge port (21) Internal discharge pipe (22) Oil return passage (P) Shaft center

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kazuhiro Furusho, 1304 Kanaoka-machi, Sakai City, Osaka Prefecture Daikin Industries, Ltd., Kanaoka Plant, Sakai Manufacturing Co., Ltd. (72) Hideki Hara, No. 1 Nishiichitsuya, Settsu City, Osaka Prefecture Daikin Industry Co., Ltd. Yodogawa Works

Claims (4)

[Claims] 1. A spiral wrap (6) on an end plate (6a).
For the fixed scroll (6) having b), the end plate (7
a) A revolving scroll (7) having a spiral wrap (7b) on the periphery of the axis (P) with the working chamber (2a) formed between the opposing wraps (6b) and (7b). The revolving scroll (7) is revolvable and non-revolving, and with the revolution of the revolving scroll (7), the working chamber (2a) formed from the outer peripheral side between both laps (6b) and (7b) is set to the axis (P). Lubricating oil is mixed in the working gas by revolving the orbiting scroll (7) and the orbiting scroll (7) so as to reduce the volume of the working chamber (2a) while moving in a spiral direction. The mixed fluid thus formed is applied to the working chamber (2a).
And a drive mechanism section (3) for compressing and discharging the mixed fluid in the working chamber (2a) and the scroll mechanism section (2) and the drive mechanism section (3). A high-pressure chamber (4) for storing the mixed fluid discharged from the mechanism section (2) is provided on the upper side inside, and an oil sump (5) for storing the lubricating oil is provided on the lower side inside. In a scroll type fluid device provided with a casing (1), a mixed fluid which is arranged in the high pressure chamber (4) and is discharged from the scroll mechanism section (2) has a shaft center ( P) and an internal discharge pipe (21) that swirls around, and an upper end is opened at a position near the side wall surface of the bottom wall surface of the high pressure chamber (4), while a lower end is directed toward the oil sump (5). And an oil return passage (22) that is opened. Scroll type fluid apparatus according to claim. 2. The scroll type fluid device according to claim 1, wherein the working gas is a fluorinated hydrocarbon refrigerant, and the lubricating oil is a fluorinated lubricating oil. 3. The scroll type fluid device according to claim 1, wherein the scroll mechanism portion (2) is provided at the center of the bottom wall surface of the high pressure chamber (4).
A discharge port (20) for discharging the mixed fluid compressed by the above into the high-pressure chamber (4) is provided, and the internal discharge pipe (21) extends from the axial center (P) outward in the radial direction. It is arranged such that one end is connected to the discharge port (20) and the other end is opened in a direction near the side wall surface of the high pressure chamber (4) in a direction in which the mixed fluid is swirled. Scroll type fluid device. 4. The scroll type fluid device according to claim 3, wherein the bottom wall surface of the high-pressure chamber (4) is provided with a substantially tapered cross-section that gradually decreases outward in the radial direction. Scroll type fluid device.