JP2000213478A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor which is improved in reliability by forming an oil supply passage for removing abrasion powder. SOLUTION: A compression part 2 and an electrically driven motor 3 are arranged in a sealed vessel 1. The compression part 2 is mainly composed of a fixed scroll 4, a rotary scroll 5, and a main bearing 9. A discharge port 15 is formed on the center of the fixed scroll 4, while a compression chamber 12 and a discharge chamber 19 with normal discharge pressure are arranged in the vicinity of the discharge port 15. A discharge pipe 18 is lead from the discharge chamber 19 to the outside. A suction pipe 13 is communicated with a suction port through the sealed vessel 1. An electrically driven motor chamber 17 is arranged between the compression part 2 and the electrically driven motor 3. A low pressure back pressure chamber 6 is arranged between a back surface of the rotary scroll 5 and the main bearing 9. An oil supply groove 16 is formed on outer peripheries of the main bearing 9 and the fixed scroll 4 for communicating the discharge chamber 19 with the electrically driven motor chamber 17. An oil supply passage 20 is formed on the main bearing 9, between the portion on the way of the oil supply groove 16 and the low pressure back pressure chamber 6 of the rotary scroll 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly, to a structure for lubricating a compression section and removing abrasion powder.

[0002]

2. Description of the Related Art FIG. 5 is a longitudinal sectional view showing the structure of a conventional scroll type compressor, and FIG. 6 is an enlarged transverse sectional view of a main part in FIG.

[0003] In a scroll type compressor, a compression section 2 and an electric motor 3 are built in a sealed container 1. The compression section 2 is mainly composed of a fixed scroll 4, an orbiting scroll 5, a rotation preventing device, an orbiting drive shaft 7, a crankshaft 8, a main bearing 9, a metal bearing 10, and a shaft 11.

[0004] The compression section 2 is composed of a fixed scroll 4 having a spiral wrap 4b on a head plate 4a and a head plate 5a.
The orbiting scroll 5 which has a wrap 5b of the same shape and meshes with the fixed scroll 4 to form a plurality of compression chambers 12 and the like is provided. Furthermore, the orbiting scroll 5
A shaft 11 that supports the orbiting drive shaft 7 and forms a crankshaft 8 at the lower end for orbiting drive; a main bearing 7 that supports the crankshaft 8; and a shaft formed at the center of the bottom surface of the fixed scroll 4. Discharge port 15 communicating with central compression chamber 12
Is provided.

In this configuration, when the shaft 11 is rotated by the rotation of the electric motor 3, the orbiting scroll 5 makes a revolving motion with respect to the fixed scroll 4 without rotating by the anti-rotation device, and the fixed scroll 4 and the orbiting scroll 5 mesh. The compression chamber 12 is moved from the outer peripheral part to the central part sequentially, and is moved from the suction pipe 13 to the suction chamber 14.
The volume of the refrigerant gas taken into the tank decreases, and a compression action occurs. The compressed gas of the refrigerant enters the motor chamber 17 through a communication passage (oil supply groove 16) from a discharge port 15 provided at the center of the fixed scroll 4, and is guided to the outside through a discharge pipe 18.

As a conventional technique, oil pumped by an oil pump 11a is used as a bearing (main bearing 7,
To feed a part of the oil to the back pressure chamber of the compression unit 2 by using a small hole provided in the orbiting scroll 5 or a method of injecting oil by using a clearance around the bearing. Is commonly used.

However, since the oil that has partially passed through the bearing is injected through the pores, fine wear powder cannot be removed and is supplied to the pressure weft chamber 12 as it is. If this abrasion powder enters the sliding surface, it may cause a cause such as galling. In addition, when pores are used, there is a problem that dust or abrasion powder larger than the pores may cause clogging. For this reason, a scroll-type compressor aiming at improving the reliability by removing the abrasion powder has been expected.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a scroll type compressor having an oil supply passage for removing abrasion powder and having improved reliability. And

[0009]

According to the present invention, a compression unit and an electric motor are arranged in a sealed container, and the compression unit includes a fixed scroll having a spiral wrap on a head plate and a wrap of the same shape on a head plate. An orbiting scroll that meshes with the fixed scroll to form a plurality of compression chambers; a motor shaft that supports an orbiting drive shaft of the orbiting scroll and forms a crankshaft at one end to orbitally drive; A discharge port that is constituted by a main bearing that supports the crankshaft and a sub-bearing and communicates with the central compression chamber formed at the center of the bottom surface of the fixed scroll; A discharge chamber provided on the side, a discharge pipe passing through the sealed container from the discharge chamber and communicating with the outside, a suction pipe communicating with a suction port through the sealed container, and between the compression unit and the electric motor. Motor room and front A scroll compressor having a low-pressure back-pressure chamber between the orbiting scroll back surface and the main bearing, and having an oil supply groove communicating the discharge chamber and the motor chamber on the outer periphery of the main bearing and the fixed scroll. An oil passage is provided between the oil supply groove and the low-pressure back pressure chamber of the orbiting scroll.

[0010] The oil passage may be provided in the main bearing.

Alternatively, the oil passage is provided in the fixed scroll. Further, a throttle or a fine hole is provided in the oil passage.

On the other hand, a filter for removing abrasion powder is provided at an opening of the oil supply groove on the main bearing side. The filter is a wire mesh. Or
The filter is a magnet.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail based on embodiments with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a configuration of a scroll compressor according to one embodiment of the present invention, and FIG. 2 is an enlarged transverse sectional view of a main part in FIG.

Other than the basic configuration of the present embodiment, it is the same as the conventional example shown in FIG. 5, so that the description of the overall configuration will be omitted. The same numbers are used for the same components.

A compression unit 2 and an electric motor 3 are arranged in a sealed container 1, and the compression unit is formed into a fixed scroll 4 having a spiral wrap 4b, and a fixed scroll 4 meshed with the fixed scroll 4 to form a spiral. A revolving scroll 5 having a wrap 5b and forming a compression chamber 12 and the like; a shaft 11 for supporting a revolving drive shaft 7 of the revolving scroll 5 and forming a crankshaft 8 at one end for revolving motion; Main bearing 9 that supports the crankshaft 8
This constitutes a scroll compressor.

A discharge port 15 is provided at the center of the fixed scroll 4, and a compression chamber 12 and a discharge chamber 19 having a normal discharge pressure are provided near the discharge port 15. Further, a discharge pipe 18 that communicates with the outside through the sealed container 1 from the discharge chamber 19, a suction pipe 13 that communicates with the suction port through the sealed container 1, and between the compression unit 2 and the electric motor 3. A low-pressure back pressure chamber 6 is provided between the motor chamber 17 and the rear surface of the orbiting scroll 5 and the main bearing 9, and the discharge chamber 19 and the motor chamber 17 are provided on the outer periphery of the main bearing 9 and the fixed scroll 4. An oil supply groove 16 that communicates is provided.

An oil passage 20 is provided between the oil supply groove 16 and the low-pressure back pressure chamber 6 of the orbiting scroll 5.

The oil passage 20 is connected to the main bearing 9
Is provided.

A throttle 20a is provided in the oil passage 20.
(Or pores).

Next, the operation and effect of the present invention will be described. The refrigerant guided to the compression chamber 12 through the suction pipe 13 is compressed in the compression chamber 12 and discharged to the discharge chamber 19. Then, part of the oil is separated in the discharge chamber 19, and the oil accumulated on the bottom surface moves to the electric motor chamber 17 via the oil supply groove 16 by a differential pressure.

The present invention is to inject a part of the oil separated in the discharge chamber 19 into the compression chamber 12 again. Also,
The oil separated in the discharge chamber 19 is supplied to at least the compression chamber 1
It only contains enough wear powder to pass through the second.

The oil is always supplied without wear powder, and at the worst, only the wear powder that can pass through the compression chamber 12 is supplied again. Therefore, it is possible to supply oil to the sliding portion without any problem.

As a result, it is possible to inject oil without supplying to the compression chamber 12 what has a bad influence on reliability, such as abrasion powder, and it is expected that reliability is improved.

FIG. 3 is an enlarged cross-sectional view of a main part showing a configuration of a scroll compressor according to another embodiment of the present invention. As in the case of this embodiment, the oil passage 20 may be provided in the fixed scroll. A wire mesh 16a is provided at an opening of the oil supply groove 16 on the main bearing 9 side as a filter for removing abrasion powder. This is to prevent dust or abrasion powder precipitated in the oil at the time of startup from moving to the oil passage 20.

FIG. 4 is an enlarged cross-sectional view showing a main part of a scroll compressor according to another embodiment of the present invention. In this embodiment, a magnet 16b is provided at the opening of the oil supply groove 16 on the main bearing 9 side as a filter for removing abrasion powder. This is to prevent dust or abrasion powder precipitated in the oil at the time of startup from moving to the oil passage 20.

According to the present invention, even when the scroll compressor is of the vertical type, the same operation and effect as those of the horizontal type shown in the above embodiment can be obtained.

[0027]

According to the present invention, a compression section and an electric motor are arranged in a sealed container, and the compression section has a fixed scroll having a spiral wrap on a head plate and a wrap of the same shape on a head plate. An orbiting scroll that meshes with the fixed scroll to form a plurality of compression chambers; a motor shaft that supports an orbiting drive shaft of the orbiting scroll and forms a crankshaft at one end to orbitally drive; and the crankshaft. A discharge port communicating with the central compression chamber formed at the center of the bottom surface of the fixed scroll, the discharge port being formed of a main bearing and a sub-bearing, and communicating with the discharge port, on one side of the sealed container. A discharge chamber provided, and the sealed container is passed from the discharge chamber,
A discharge pipe that communicates with the outside, a suction pipe that communicates with the suction port through the sealed container, a motor chamber between the compression unit and the motor, and a low-pressure back pressure chamber between the back of the orbiting scroll and the main bearing. A scroll type compressor having an oil supply groove communicating with the discharge chamber and the electric motor chamber at the outer peripheral portion of the main bearing and the fixed scroll, wherein a low pressure back pressure of the oil supply groove and the orbiting scroll is provided. An oil passage is provided between the chamber and the chamber. As a result, it is possible to provide a scroll compressor having an oil supply passage for removing abrasion powder and having improved reliability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of a scroll compressor according to one embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part in FIG.

FIG. 3 is an enlarged cross-sectional view of a main part showing a configuration of a scroll compressor according to another embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a main part showing a configuration of a scroll compressor according to another embodiment of the present invention.

FIG. 5 is a longitudinal sectional view showing a configuration of a conventional scroll compressor.

FIG. 6 is an enlarged cross-sectional view of a main part in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing container 2 Compressor 3 Electric motor 4 Fixed scroll 4a End plate 4b Lap 5 Orbiting scroll 5a End plate 5b Lap 6 Low pressure back pressure chamber 7 Orbital drive shaft 8 Crankshaft 9 Main bearing 10 Metal bearing 11 Shaft 11a Oil pump 12 Compression chamber 13 Suction Pipe 14 Suction chamber 15 Discharge port 16 Oil supply groove 16a Wire mesh 16b Magnet 17 Motor room 18 Discharge pipe 19 Discharge chamber 20 Oil passage 20a Restrictor

Claims (7)

[Claims] 1. A compressor and an electric motor are arranged in a sealed container,
A fixed scroll having a spiral wrap on a head plate, a orbiting scroll having a same shape wrap on a head plate, and meshing with the fixed scroll to form a plurality of compression chambers; It comprises a shaft of an electric motor which supports a scroll drive shaft and forms a crankshaft at one end to drive the orbit, a main bearing which supports the crankshaft, and an auxiliary bearing, and is formed at the center of the bottom surface of the fixed scroll. A discharge port that communicates with the central compression chamber, a discharge chamber that communicates with the discharge port, and is provided on one side of the sealed container, and a discharge pipe that communicates with the outside through the sealed container from the discharge chamber. A suction pipe that communicates with a suction port through the sealed container, a motor chamber between the compression unit and the motor, and a low-pressure back-pressure chamber between the orbiting scroll back surface and the main bearing;
In a scroll type compressor provided with an oil supply groove communicating the discharge chamber and the electric motor chamber on the outer periphery of the main bearing and the fixed scroll, between a middle of the oil supply groove and a low-pressure back pressure chamber of the orbiting scroll. A scroll type compressor provided with an oil passage. 2. The scroll compressor according to claim 1, wherein said oil passage is provided in said main bearing. 3. The scroll compressor according to claim 1, wherein the oil passage is provided in the fixed scroll. 4. The scroll type compressor according to claim 1, wherein a throttle or a fine hole is provided in the oil passage. 5. The scroll compressor according to claim 1, wherein a filter for removing abrasion powder is provided at an opening of the oil supply groove on the main bearing side. 6. The scroll compressor according to claim 5, wherein said filter is a wire mesh. 7. The scroll compressor according to claim 5, wherein the filter is a magnet.