JP2005061374A - Horizontal scroll air compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal scroll air compressor capable of reducing flexure of a shaft, and supplying lubricating oil to a scroll compression part and each bearing without providing an oil pump. <P>SOLUTION: This device is provided with a compression mechanism A comprising an air suction part 5, and the scroll compression part 9 to compress sucked air, and a motor B comprising a stator 18 tightly installed on a housing 1, a rotor 19 tightly installed on the shaft 3, and bearings 20 supporting the shaft 3 on both sides of the rotor 19 to drive the compression mechanism A from sideways. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a horizontal scroll air compressor.

In the conventional horizontal scroll air compressor, the stator of the electric motor that drives the scroll compression unit from the side is suspended from the housing, and a part of the stator is in contact with the housing, but the other part is It was fixed with a gap between it and the housing.
Further, the rotor has a cantilever support structure by providing a plurality of bearings on a frame extending along the shaft from the scroll compression portion side, and a pump device provided on a part of the shaft causes a lower portion of the motor to Lubricating oil is sucked up from the formed oil reservoir and supplied to the bearing of the electric motor and the bearing of the scroll compressor through the passage in the shaft. (For example, refer to Patent Document 1).

Japanese Patent No. 2543275 (paragraphs 0009-0017, FIG. 1)

The conventional horizontal scroll air compressor is configured as described above, and the motor housing and the stator are not in close contact with each other. Therefore, when the housing is cooled by an external cooling fan, the motor is sufficiently There was a problem that it could not be cooled.
In addition, since the rotor of the motor has a cantilever support structure, the shaft load angle decreases due to the shaft tilt angle increasing due to the bending of the shaft due to centrifugal force, resulting in abnormal wear and seizure due to contact with the bearing piece. There was a problem that occurred.

Furthermore, since the lubricating oil is sucked up by the pump device provided on the shaft and supplied to each bearing, it is necessary to provide an oil reservoir in the scroll compressor and the motor, which increases the size of the compressor and increases the number of parts. It was a factor.
Further, since lubricating oil mixed with foreign matters such as wear powder flows into the motor winding portion, there is a problem in that the motor winding is deteriorated or damaged.
Moreover, in order to avoid the discharge temperature rise by air compression, there also existed a problem that the piping path | route which has a cooling means by oil injection etc. was needed.

  The present invention has been made to cope with the above-described problems, and can reduce the deflection of the shaft and supply lubricating oil to the scroll compression portion and its bearing without providing an oil pump. An object is to provide a horizontal scroll air compressor.

  A horizontal scroll air compressor according to the present invention is a compressor that has an air suction portion, a scroll compression portion that compresses the sucked air, a stator that is tightly attached to the housing, and a shaft that is tightly attached to the shaft. An electric motor having a rotor and bearings for supporting the shaft on both sides of the rotor and driving the compression mechanism from the side is provided.

Since the present invention is configured as described above, it is possible to reduce the deflection of the shaft due to the centrifugal force during the rotation of the rotor of the electric motor, and accordingly, the bearing load capacity is reduced due to the inclination of the shaft in the bearing. Therefore, a highly reliable air compressor can be obtained.
Also, without providing a complicated oil pump, lubricating oil can be efficiently and continuously supplied to the scroll compression section and its bearings by the pressure difference between the high and low pressures of the scroll compression section and supplied to the bearings of the compression section. The lubricating oil thus discharged can be discharged together with the compressed air from the compression section to the outside of the compressor and returned to the compressor via the oil separator, so that the lubricating oil can be circulated without a complicated oil return circuit.

Further, since the lubricating oil does not flow into the electric motor, the lubricating oil is not affected by the heat of the electric motor that is a heating element, and the oil temperature rise can be reduced. In addition, it is possible to prevent the motor windings from being deteriorated or damaged due to the inflow of lubricating oil mixed with wear powder or the like.
Further, since the balancer is provided in the electric motor, the lubricant is not stirred by the balancer and there is no extra input increase, so that a highly reliable high-performance air compressor can be obtained.
Furthermore, since the throttle device is provided in the passage that connects the main bearing and the rocking bearing of the scroll compression section, the amount of oil supplied to the main bearing and the rocking bearing can be adjusted appropriately.

  In addition, since the oil that has lubricated the thrust bearing is supplied to the scroll compressor from above the scroll center of the scroll compressor, even if oil from the oil supply pipe flows in when the air compressor is stopped In addition, it does not stay in the scroll compression section, and there is no possibility that the device will reach a dangerous state. That is, when the air compressor is stopped, the solenoid valve or the like is normally operated so that oil from the oil supply pipe does not flow into the scroll compressor, but it flows in for some reason, and the air compressor is in that state. When activated, excessive pressure may be generated due to oil compression, which may cause vortex cracking, but if the oil inflow passage to the scroll compression section is provided above the center of the vortex, the amount of oil Therefore, it is possible to effectively avoid the dangerous state as described above.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing a configuration of a horizontal scroll air compressor according to Embodiment 1. FIG.
This embodiment includes a compression mechanism A having a scroll compression unit and an electric motor B that drives the compression mechanism from the side. The compression mechanism A and the electric motor B are partitioned by the partition wall 2 in the sealed container 1, and an oil seal 4 is provided between the shaft 3 and the partition wall 2 that penetrates the partition wall 2 and connects the compression mechanism A and the electric motor B. Thus, the compression mechanism A and the electric motor B are separated.

  The compression mechanism A includes an air suction pipe 5, a well-known scroll compression unit 9 that compresses the sucked air between the fixed scroll 6 and the swing scroll 7, and discharges it from the discharge pipe 8, and one end of the shaft 3. The frame 10 to be supported, the main bearing 11 provided between the frame 10 and the shaft 3, the eccentric shaft portion 3A formed at one end of the shaft 3, and the eccentric shaft portion formed on the back surface of the orbiting scroll 7. Oscillating bearing 12 provided between boss portions 7A fitted to 3A, oil supply pipe 13 that passes through frame 10 of compression mechanism A and supplies lubricating oil to main bearing 11, and communicates with main bearing 11. One end of the oil return chamber 15 provided in the lower part of the compression mechanism and the main bearing 11 is opened, and the other end is provided so as to extend in the axial direction in the shaft 3 and open to the tip surface of the eccentric shaft portion 3A. Passage 16 and a screw in the passage 16. A throttling device 17 that squeezes the amount of oil by providing a thin through hole, and a passage 30 that supplies oil to the scroll compressor 9 from above the center of the spiral of the scroll compressor 9 via the thrust bearing 25 from the rocking bearing 12; A space 31, a passage 32, and a space 33 are provided.

The electric motor B includes a stator 18 that is tightly fixed to the housing 1 constituting the hermetic container by shrink fitting, a rotor 19 that is also closely fixed to the shaft 3 by shrink fitting, and the main bearing 11. A bearing 20 that supports the shaft 3 on both sides of the rotor 19, a cooling fan 21 fixed to the other end of the shaft 3 outside the housing 1, and covers the cooling fan 21 and a part of the housing 1. 1 is provided with a cover 22 that forms a cooling air passage 23 between them and a balancer 24 provided on the shaft 3 in the electric motor B.
In addition, the lubricating oil is not allowed to flow into the electric motor B.

Since the first embodiment is configured as described above, the lubricating oil is supplied only to the compression mechanism by the oil supply pipe 13. Lubricating oil flowing in from the oil supply pipe 13 is supplied to the main bearing 11 and then passes through the passage and the passage 16 that directly communicates the main bearing 11 and the swing bearing 12 and the passage that reaches the swing bearing 12 through the expansion device 17. Both are supplied to the rocking bearing 12.
In the passage 16, the lubricating oil is throttled by the throttle device 17, so that the amount of oil supplied to the main bearing 11 and the rocking bearing 12 can be adjusted appropriately.
Also, the oil in the oil return chamber 15 below the compression mechanism is transferred to the thrust bearing 25 through the main bearing 11 and the rocking bearing 12 due to the high-low pressure difference between the suction pressure of the scroll compressor 9 and the passages connected to the bearings. Furthermore, it reaches the space 31 through the passage 30 provided in the frame 10 by opening to the thrust bearing 25, and the passage 32 and the scroll compression portion provided above the center of the spiral of the scroll compression portion 9 from the space 31. 9 reaches the scroll compression section 9 through the space 33.

Thereafter, the gas is discharged from the discharge pipe 8 together with the compressed air, but an increase in the discharge temperature can be suppressed by oil injection at this time.
The discharged oil is separated by an oil separator (not shown) outside the apparatus and returned to the compressor through the oil supply pipe 13. On the other hand, since no lubricating oil is allowed to flow into the electric motor B, the lubricating oil is not affected by the heat of the electric motor, which is a heating element, and therefore an increase in the oil temperature can be reduced.
Further, since the oil is not agitated by the balancer 24, there is no extra input increase, and a highly reliable high-performance air compressor can be obtained.

It is sectional drawing which shows the structure of the horizontal scroll air compression apparatus by Embodiment 1 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS A Compression mechanism B Electric motor 1 Housing 3 Shaft 9 Scroll compression part 11 Main bearing 12 Rocking bearing 15 Oil return chamber 16, 30 passage 17 Throttle device 18 Stator 19 Rotor 20 Bearing 21 Cooling fan 22 Cover 23 Cooling air passage 24 Balancer 25 Thrust bearing 31 Space

Claims (6)

  A compression mechanism having a suction part for air and a scroll compression part for compressing the sucked air and a stator that is tightly attached to the housing, a rotor that is closely attached to the shaft, and both sides of the rotor. A horizontal scroll air compression apparatus comprising an electric motor having a bearing for supporting a shaft and driving the compression mechanism from a side.   An air cooling fan fixed to the shaft outside the motor housing and a cover for covering a part of the air cooling fan and the housing and forming a cooling air passage between the housing and the housing. The horizontal scroll air compressor according to claim 1.   The compression mechanism and the electric motor are separated by a partition wall, and a balancer is provided on the shaft in the electric motor, and lubricating oil is allowed to flow into the compression mechanism, and lubricating oil is not allowed to flow into the electric motor. The horizontal scroll air compressor according to claim 1 or 2.   The compression mechanism is provided with an oil return chamber that communicates with the intake pressure of the scroll compression section, and a passage that communicates the main bearing and the swing bearing of the scroll compression section, and the swing bearing and the thrust bearing. Communicating the passage and the thrust bearing with the scroll compression portion, providing a passage formed above the center of the spiral of the scroll compression portion, the scroll compression based on the pressure difference between the oil return chamber and each passage The horizontal scroll air compressor according to any one of claims 1 to 3, wherein lubricating oil is supplied to the section and each bearing.   5. A horizontal scroll air compressor according to claim 4, wherein a passage communicating the main bearing and the rocking bearing of the scroll compressor is provided in the shaft, and a throttle device is provided in the passage in the shaft. .   6. The horizontal scroll air compressor according to claim 5, wherein the throttle device is constituted by a screw having a through hole and is screwed into a passage in the shaft.

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