JPH06341382A - Scroll compressor - Google Patents

Abstract

PURPOSE:To provide a scroll compressor of turn-together type in which stirring due to the discharge gas fluid in a casing is precluded while such a structure is introduced that a discharge passage is furnished in a drive shaft to be open to inside of the casing and which allows oil separation, lessening of oil carrying-up together in an oil sap, and preventing an oil lift. CONSTITUTION:A discharge passage 22 in communication with the discharge port of a drive scroll 3 is furnished in the driving shaft 8 of the scroll 3 and is left open to the space 23 bounded by a bearing housing 10 and a motor 2. Aroud the driving shaft 8, a cover 25 is furnished to partition the peripheral space of the opening of discharge passage 22 from the said space 23, and a discharge chamber 26 surrounding the passage opening 24 is provided, wherein the cover 25 is equipped with a gas leadout port 28 which opens to the rotor 27 of the motor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, more specifically, a scroll compression element having a drive scroll and a driven scroll provided on one side in the lengthwise direction of a casing.
The present invention relates to a scroll compressor having a motor for driving each scroll on the other side.

[0002]

2. Description of the Related Art Conventionally, a co-rotating scroll compressor having a driving scroll and a driven scroll is disclosed in JP-A-4-12.
182 and Japanese Patent Laid-Open No. 4-76286.

As shown in FIG. 5, the scroll compressor disclosed in Japanese Patent Application Laid-Open No. 4-12182 has bearing housings B and C installed in the upper portion of a vertically long casing A, and these bearing housings B and C are provided. A drive scroll D and a follower scroll E are installed in the inner cavity P of the motor, and a motor M is installed in the lower portion of the casing A so that the drive shaft S of the drive scroll D communicates with a discharge port. A passage F is provided, and this discharge passage F is a space G between the bearing housing C and the motor M, and a space between the motor M and a bearing body H that supports the lower portion of the drive shaft S. J is opened through discharge holes K and L, respectively, and the driven scroll E is driven to rotate while the driven scroll E is driven to orbit to make a compression chamber formed between the scrolls D and E. The lumen part Compressing the gas fluid sucked from through the discharge passage F from the discharge port, the discharge holes K, L
From the above to the spaces G and J, and also to the external discharge pipe N opening in the space G.
In FIG. 5, Q is a suction pipe, R is a discharge valve provided in the discharge holes K and L, and T is an oil sump.

On the other hand, the scroll compressor shown in Japanese Patent Laid-Open No. 4-76286 is basically the same as that shown in FIG. 5, although the scroll compressor is not shown, and the discharge passage F is connected to the bearing housing C and the motor. The space G between M and M is opened via a discharge hole K.

[0005]

In the co-rotating scroll compressor configured as described above, the discharge passage F provided in the drive shaft S extends radially outward from the middle of the drive shaft S. Since the openings G and L of the casing A are opened through the discharge holes K and L, the discharge passage F is formed.
The discharge gas fluid that flows out into the casing A is discharged from the discharge holes K and L over the entire circumferential region of the casing A as the drive shaft S rotates, so that the inside of the casing A becomes agitated. However, there is a problem that oil contained in the discharge gas fluid cannot be sufficiently separated and oil rises, and in particular, as described in JP-A-4-12182, the motor M and the bearing body are In the space J between H and the discharge hole L
When the motor is open, the motor M can be cooled, but the oil stored in the oil sump T is rolled up, and there is a problem that more oil rises.

Incidentally, in each of the above-mentioned conventional examples, since the discharge valve V is provided in the discharge holes K and L, the discharge in the radial direction is suppressed, and the casing is compared with the case where the discharge valve V is not provided. Although the internal stirring can be suppressed, the discharge valve V is also driven by the drive shaft S.
As it rotates with it, agitation still occurs in the casing system, leaving the problems mentioned above.

According to Japanese Patent Laid-Open No. 4-76286, the discharge hole is opened only in the space between the bearing housing and the motor, and is discharged in the space between the motor and the lower bearing body. Since the holes are not opened, the problem of winding up the oil in the oil sump can be suppressed, but there is a problem that the motor cooling becomes insufficient.

An object of the present invention is to reduce the agitation in the casing due to the discharge of the gas fluid and the oil rise while sufficiently cooling the motor.

[0009]

In order to achieve the above object, the present invention is provided with a drive scroll 3 and a driven scroll 4 on one side in the length direction of a casing 1, and the scrolls 3 on the other side. In a scroll fluid machine in which the motor 2 for driving the motors 4 and 4 is installed, the drive shaft 8 of the drive scroll 3 is provided with a discharge passage 22 communicating with the discharge port 3b of the drive scroll 3, and the discharge passage 22 is provided. , A bearing housing 10 supporting the drive shaft 8 and the motor 2
And a cover 25 that defines an outer peripheral space of the passage opening 24 of the discharge passage 22 with the space 23 is provided around the drive shaft 8. While forming a discharge chamber 26 surrounding the portion 24, a gas outlet 28 that opens toward the rotor 27 side of the motor 2 is provided in the cover 25.

Further, in the above structure, the rotor 27 of the motor 2 is provided with the gas passage 30 penetrating from one side in the axial direction to the other side, and the gas outlet 28 of the cover 25 is connected to the gas passage. Opening towards 30 is preferred.

The gas outlet 28 of the cover 25 may be opened toward the air gap between the rotor 27 and the stator 33 of the motor 2.

Further, the discharge chamber 26 and the casing 1
An oil return passage 34 for guiding the oil separated in the discharge chamber 26 to the oil sump 14 is preferably provided between the oil sump 14 and the oil sump 14 therein.

[0013]

Since the cover 25 is provided around the drive shaft 8 to form the discharge chamber 26 surrounding the passage opening 24, the discharge passage 22 is provided in the drive shaft 8.
Even if it is opened in the radial direction, it will be rectified from the discharge chamber 26 and discharged from the gas outlet 28, so that the inside of the casing 1 can be prevented from being stirred by the discharged gas fluid. , The above-mentioned cover 25
Since a gas outlet port 28 opening toward the rotor 27 side of the motor 2 is provided in the motor, the gas fluid rectified and led out from the gas outlet port 28 flows to the motor side, The motor 2 can be cooled effectively. Moreover, since it is possible to prevent stirring in the casing 1 by the discharged gas fluid,
The oil can be well separated, the amount of oil in the oil sump that is discharged by the discharged gas fluid can be reduced, and oil rising can be prevented.

Further, the rotor 27 of the motor 2 is provided with the gas passage 30 and the gas outlet 28 is opened toward the gas passage 30, so that stirring of the discharged gas fluid is reduced and the motor is reduced. The cooling of the water can be made more effective.
The gas outlet 28 may be opened even if it is opened toward the air gap between the rotor 27 and the stator 33 of the motor 2.
Can effectively cool the water. Further, the discharge chamber 26
By providing the oil return passage 34 between the oil reservoir 14 and the oil sump 14, the oil separated in the discharge chamber 26 can be surely returned to the oil sump 14, and the oil rising can be prevented more effectively.

[0015]

1 is a scroll compressor for a refrigerator, in which a motor 2 is installed in a lower portion of a vertically long casing 1 and a drive scroll 3 driven by the motor 2 is provided in an upper portion. A driven scroll 4 is disposed which is driven by the drive scroll 3 to rotate while being driven to orbit. More specifically, in the upper part of the casing 1,
An upper bearing housing 7 that rotatably supports an eccentric driven shaft 5 protruding from an end plate 4a of the driven scroll 4 via a bearing 6 and a lower bearing housing that supports a drive shaft 8 of the drive scroll 3 via a bearing 9. 10 and 10 are integrated with each other by bolt connection to form a suction chamber 11 closed by these bearing housings 7 and 10 to open the suction pipe 10, and the lower end of the drive shaft 8 is bearing at the lower part. A bearing body 13 supported via 12 is internally provided, and an oil sump 14 is formed at the lowermost portion.

Further, the driven scroll 4 is the end plate 4
It has a cylindrical peripheral wall 4b continuous to the outer peripheral portion of a, and a thrust plate 15 is bolted to the end of the peripheral wall 4b so as to insert the end plate 3a of the drive scroll 3 therein.

A drive shaft 8 of the drive scroll 3 is provided between the drive scroll 3 and the driven scroll 4.
The drive mechanism is transmitted to the driven scroll 4 so that the driven scroll 4 can be rotated while being driven to rotate. This transmission mechanism includes an Oldham joint 16 made of a ring plate, a drive scroll side key (not shown) provided on the Oldham joint 16 and a thrust plate side key 18 which engage and slide with each other. No.) and the thrust plate side key groove 20.

The Oldham joint 16 is accommodated in a joint accommodating portion 21 formed in the thrust plate 15 so as to be capable of pivoting movement, the drive scroll side key is in the drive scroll side key groove, and the thrust plate side key 18 is the thrust plate. Each of the side key grooves 20 is inserted so as to be slidable in the radial direction. Therefore, when the drive shaft 8 is driven and the drive scroll 3 rotates, the driven scroll 4 also rotates via the Oldham coupling 16 and the thrust plate 15, and the driven shaft 5 is eccentric with respect to the drive shaft 8. Therefore, a swirling motion is performed simultaneously with the rotation, and the swirling motion causes the refrigerant gas sucked from the suction chamber 11 to be compressed in the compression chamber formed between the scrolls 3, 4.

A discharge passage 22 communicating with the discharge port of the drive scroll 3 is provided above the drive shaft 8, and the tip end side of the discharge passage 22 is connected to the lower bearing housing 10 and the motor. A passage opening 24 is provided that opens radially toward the space 23 between the switch 2 and the switch 2.

A hat-shaped cover 25, which defines the outer peripheral space of the passage opening 24 with the space 23, is arranged around the drive shaft 8 in which the discharge passage 22 is open, and is attached thereto. A discharge chamber 26 that surrounds the passage opening 24 is formed by being bolted to the lower bearing housing 10 through a flange 25a.
A gas outlet 28 that opens toward the rotor 27 side of the motor 2 is provided at the bottom of the motor 5.

Further, in the embodiment shown in FIG.
In the rotor 26 of the rotor 2, a plurality of gas passages 30 are provided on the drive shaft 8 side, and the gas outlet port 28 is opened toward the gas passage 30. In FIG. 1, 31
Is an external discharge pipe that opens into the space 23, 41 is an oil supply pump, and 42 is an oil supply passage that communicates with an oil supply passage (not shown) provided in the drive shaft 8 via a bearing 9 to supply oil to the bearing 6.

Therefore, the refrigerant gas that has driven the drive shaft 8 and compressed in the compression chamber passes from the discharge port of the drive scroll 3 through the discharge passage 22 to the discharge chamber 26.
The oil mixed in the refrigerant gas is separated in the discharge chamber 26, is rectified from the gas outlet 28 and is guided to the gas passage 30, and the gas is passed through the gas passage 30. The air gap between the rotor 27 and the stator 33 of the motor 2 and the core of the stator 33 are reached by making a U-turn in the space 32 between the motor 2 and the bearing body 13 when reaching the counter scroll side of the motor 2. After being cut, it returns to the space 23 and is discharged to the outside from the external discharge pipe 31, and the refrigerant gas is rectified and guided to the gas passage 30, and discharged to the outside through the path described above. Therefore, the inside of the casing 1 can be less agitated by the discharged gas refrigerant, and the cooling of the motor 2 can be effectively performed. Further, the oil mixed in the refrigerant gas is discharged in the discharge chamber 26. In addition, since the agitation in the casing 1 is further reduced, the oil separation can be effectively performed even in the discharge path, and the oil in the oil sump 14 can be wound up less. The oil rise can be reduced.

Further, in the embodiment shown in FIG. 1, an oil return passage 34 consisting of a pipe for guiding the oil separated in the discharge chamber 26 to the oil sump 14 is provided between the discharge chamber 26 and the oil sump 14. Therefore, the oil separated in the discharge chamber 26 can be effectively returned to the oil sump 14, and by doing so, the oil rise can be further reduced.

In the embodiment described above, the gas passage 30 is formed in the rotor 27 of the motor 2 and the gas outlet port 28 is opened toward the gas passage 30.
It may be opened toward the air gap without providing. Further, in the first embodiment of FIG. 1, the motor 2 is installed in the lower end of the casing 1, and the bearing housing 7,
10 and each scroll 3 and 4 are installed in the upper part, but FIG.
As described above, the motor 2 may be installed in the upper part of the casing 1, and the bearing housings 7 and 10 and the scrolls 3 and 4 may be installed in the lower part.

In the case of the second embodiment, the bearing housing 10 supporting the drive shaft 8 is arranged in the upper part, and the bearing housing 7 supporting the driven shaft 5 is arranged in the lower part, which is located in the upper part. An oil sump 14 is formed on the upper surface of the bearing housing 10.

Therefore, since the lower side of the cover 25 mounted on the bearing housing 10 is immersed in the oil sump 14, an oil groove is formed on the lower surface of the mounting flange 25a or the upper surface of the bearing housing 10. The oil return passage 34 is formed so that the oil separated in the discharge chamber 26 is returned from the oil return passage 34 to the oil sump 14 with a differential pressure.

Also, in the second embodiment, the casing 1
The external discharge pipe 31 is opened at the upper part of the
The discharge refrigerant gas discharged from the gas outlet port 25 of
It is guided to the upper space 35 of the motor 2 through the gas passage 30 of the motor 2 and is discharged to the outside from the external discharge pipe 31, so that the motor can be cooled while the motor is being cooled. Since the refrigerant gas that has cooled the rotor 2 is discharged to the outside without touching the oil sump 14, it is possible to further reduce the oil rise compared to the first embodiment shown in FIG. 1, and the oil return passage 34 has an oil groove. Since it can be configured by, the configuration can be simplified. Further, although the first and second embodiments are applied to the vertical scroll compressor using the vertical casing 1, it is also applicable to the horizontal scroll compressor as shown in FIG.

The horizontal scroll compressor shown in FIG. 3 is the horizontal scroll compressor of the embodiment shown in FIG. 2, in which an oil sump 14 is formed at the bottom of the casing 1 and the oil groove is formed. The only difference is that the return passage 34 is formed on the back side of the cover 25 and communicates with the oil sump 14. The oil return passage 34 of the third embodiment is formed by notching an oil groove in the mounting flange 25a of the cover 25 as shown in FIG. 4, and in the third embodiment, the external discharge pipe 31 is used. Is connected to the upper portion of the anti-scroll side space 36 of the motor 2.

Further, in both the second and third embodiments, the mode is set.
Although the gas passage 31 is formed in the rotor 27 of the rotor 2, the gas outlet port 28 may be opened toward the air gap without providing the gas passage 31. Further, each of the covers 25 is formed into a hat shape, and its mounting flange 25 is formed.
Although a is attached to the bearing housing 10, it may be attached to the casing 1 in the form of a cup, for example.

[0030]

As described above, according to the present invention, the driving scroll 3 and the driven scroll 4 are provided on one side in the length direction of the casing 1.
And a motor 2 for driving the scrolls 3 and 4 on the other side, in a scroll fluid machine, the drive shaft 8 of the drive scroll 3 communicates with the discharge port 3b of the drive scroll 3. By providing a discharge passage 22 for
The discharge passage 22 is opened in a space 23 between the bearing housing 10 supporting the drive shaft 8 and the motor 2, and a passage opening 24 of the discharge passage 22 is formed around the drive shaft 8. Is provided with a cover 25 defining the outer peripheral space of the space 23 to form a discharge chamber 26 surrounding the passage opening 24, while the cover 25 is provided on the rotor 27 side of the motor 2. Since the gas outlet 28 that opens toward the side is provided, the discharge passage 22 is formed in the drive shaft 8 and the discharge passage 22 is opened in the radial direction of the drive shaft 8. The gas is rectified in the chamber 26 and discharged from the gas outlet 28, and the casing 1 is generated by the discharged gas fluid.
The inside can be prevented from being agitated, and the cover-2
Since the gas outlet port 28 opening toward the rotor 27 side of the motor 2 is provided in the motor 5, the gas fluid which is rectified and led out from the gas outlet port 28 flows to the motor side. The motor 2 can be cooled effectively.

Further, since the stirring gas inside the casing 1 can be prevented by the discharged gas fluid, the oil can be well separated, and the oil in the oil sump can be prevented from being rolled up by the discharged gas fluid, so that the oil rising can be prevented.

Further, by providing the gas passage 30 in the rotor 27 of the motor 2 and opening the gas outlet 28 toward the gas passage 30, the stirring of the discharged gas fluid is reduced. It can be made effective by cooling the water.
The gas outlet 28 may be opened even if it is opened toward the air gap between the rotor 27 and the stator 33 of the motor 2.
Can effectively cool the water. Further, the discharge chamber 26
By providing the oil return passage 34 between the oil reservoir 14 and the oil sump 14, the oil separated in the discharge chamber 26 can be effectively returned to the oil sump 14, and oil rising can be prevented more effectively. .

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment.

FIG. 2 is a vertical sectional view of a second embodiment.

FIG. 3 is a vertical sectional view of a third embodiment.

FIG. 4 is a perspective view of the cover as viewed from the back side.

FIG. 5 is a vertical sectional view of a conventional example.

[Explanation of symbols]

 1 casing 2 motor 3 drive scroll 4 driven scroll 8 drive shaft 14 oil sump 22 discharge passage 23 space 24 passage opening 25 cover 26 discharge chamber 27 rotor 28 gas outlet 30 gas passage 33 stator 34 oil return passage

Claims (4)

[Claims] 1. A casing for driving a scroll (3) and a driven scroll (4) inside one side of the casing (1) in the longitudinal direction, and for driving the scrolls (3) (4) outside the other side. In a scroll fluid machine with a built-in drive (2), a drive shaft (8) of the drive scroll (3) is provided with a discharge passage (22) communicating with a discharge port (3b) of the drive scroll (3). The discharge passage (22) is opened in a space (23) between a bearing housing (10) supporting the drive shaft (8) and the motor (2), and the drive shaft (8). Around the discharge passage (22)
The outer peripheral space of the passage opening (24) of the space (23)
A cover (25) is defined to define the passage opening (2).
4) a discharge chamber (26) is formed to surround the cover (25), and a gas outlet (28) opening toward the rotor (27) side of the motor (2) is provided in the cover (25). A scroll compressor characterized in that 2. The rotor (27) of the motor (2) is provided with a gas passage (30) penetrating from one side to the other side in the axial direction, and a gas outlet (28) of the cover (25). 3. The scroll compressor according to claim 1, wherein the scroll compressor is opened toward the gas passage (30). 3. A gas outlet (28) of the cover (25).
The scroll compressor according to claim 1, wherein the opening is directed toward an air gap between the rotor (27) and the stator (33) of the motor (2). 4. An oil return path (1) for guiding the oil separated in the discharge chamber (26) to the oil sump (14) between the discharge chamber (26) and the oil sump (14) in the casing (1). 34) The scroll compressor according to claim 1, wherein the scroll compressor is provided.