JP3564903B2 - Scroll compressor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a scroll compressor used for air conditioning or air compression.
[0002]
[Prior art]
Conventionally, this type of compressor has, for example, a structure as shown in FIG. 3 (Japanese Patent Application Laid-Open No. Hei 8-193584). In the structure shown in FIG. 3, the refrigerating machine oil pumped by the oil pump 115 provided at the end of the crankshaft 110 during the operation of the compressor passes through the oil path 126 at the center of the crankshaft 110 and is subjected to the orbiting scroll. The end of the drive shaft 109 is reached. The refrigerating machine oil is divided into two parts at this portion, and the main refrigerating machine oil lubricates the outer peripheral portion of the orbiting scroll shaft 109, lubricates the large shaft portion 111 of the crankshaft, and then returns to the inside of the closed container 1. On the other hand, a part of the refrigerating machine oil divided at the end of the driven shaft 109 of the orbiting scroll is divided into an oil path 127 provided at the center of the shaft 109, an oil path 128 provided at the end plate, and these oil paths. After reaching the outer peripheral portion of the orbiting scroll 105 through the installed throttle portion 129, the compressed gas is supplied to the compression chamber 108 and is provided as a sealed oil when the refrigerant gas is compressed.
[0003]
[Problems to be solved by the invention]
However, in such a structure, when the compressor is operated at a low speed, the amount of the refrigerating machine oil pumped by the oil pump 115 decreases, and the oil level at the end of the driven shaft 109 of the orbiting scroll decreases, In some cases, the phenomenon that the refrigerating machine oil does not enter from the entrance of the oil path 127 provided at the center of the driven shaft 109 of the orbiting scroll has occurred. In such a case, there is a problem that the sealing oil is not supplied to the compression chamber 108 despite the low speed, and the refrigerant gas being compressed leaks to the low pressure side, and the compression efficiency is reduced.
[0004]
The present invention solves such a conventional problem, and reliably supplies a part of the refrigerating machine oil supplied for lubrication to the compression chamber 108 even at a low speed. The purpose is to ensure lubrication of the key portion of the ring.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention sets an oil path on a driven shaft of a orbiting scroll so that the sealed oil is reliably supplied to the compression chamber even when the oil amount of the oil pump at a low speed is small. Things. Further, an oil path is provided in the end plate of the orbiting scroll so as to lubricate the key portion of the Oldham ring using oil supplied to the compression chamber.
[0007]
According to the first aspect of the invention, the outlet of the oil path provided in the end plate of the orbiting scroll is provided above the center of the end plate, and the sealing oil supplied to the compression chamber is ejected from above the end plate. By doing so, oil is supplied to both the upper and lower key portions of the Oldham ring to reduce the wear of the key portions.
[0008]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
[0009]
FIG. 1 illustrates a scroll compressor according to the present invention configured as, for example, an air-conditioning refrigerant compressor. Reference numeral 1 denotes a cylindrical closed container which is installed in a substantially horizontal state. Reference numeral 2 denotes a fixed scroll having a spiral blade 4 on an end plate 3. Reference numeral 5 denotes an orbiting scroll, which is provided with a spiral blade 7 on an end plate 6. The spiral blade 7 meshes with the spiral blade 4 of the fixed scroll 2 to form a compression chamber 8. Further, the orbiting scroll 5 has a driven shaft 9 of the orbiting scroll on the back surface of the end plate 6. Reference numeral 10 denotes a crankshaft, one end 11 of which is a large shaft, the outer periphery of which is supported by a bearing member 12. Further, the large shaft 11 has a swivel bearing 13 therein, and the orbiting scroll shaft 9 is engaged with the swivel bearing 13. The other end of the crankshaft 10 is supported by a rolling bearing 14, and a tip end portion is provided with a positive displacement oil pump 15. An Oldham ring 16 is disposed between the end plate 6 of the orbiting scroll 5 and the bearing component 12, and the Oldham ring 16 engages with both the end plate 6 and the bearing component 12 to rotate the orbiting scroll 5. Has been prevented. An annular seal member 17 is provided inside the Oldham ring 16 and serves to separate the compression mechanism into a high pressure and a low pressure. Reference numeral 18 denotes an electric motor, which includes a stator 19 and a rotor 20. 21 is a head plate on the compression mechanism side, 22 is a suction pipe, 23 is a head plate on the oil pump 15 side, and 24 is a discharge pipe.
[0010]
The operation of the scroll compressor will be described. When the stator 20 and the crankshaft 10 of the electric motor rotate, the orbiting scroll 5 orbits. As a result, the volume of the compression chamber 8 formed by the two spiral blades decreases sequentially while moving from the outer periphery toward the center. As a result, new refrigerant gas is sucked into the compression chamber 8 from the suction pipe 22, and the high-pressure refrigerant gas is discharged from the discharge hole 25 at the center of the fixed scroll 2 into the closed container 1. Thereafter, the high-pressure refrigerant gas flows out of the discharge pipe 24 to a refrigeration cycle (not shown) through a gap between the compression mechanism and the closed casing 1 and a gap between the electric motors 18.
[0011]
On the other hand, although an appropriate amount of refrigerating machine oil is sealed in the closed container 1, the oil pump 15 pumps up the oil and supplies it to the scroll compression mechanism via an oil path 26 at the center of the crankshaft 10. The refrigerating machine oil that has reached the end of the driven shaft 9 of the orbiting scroll is divided into two parts at this portion, and the main amount is to lubricate the outer periphery of the driven shaft 9 of the orbiting scroll, and then the outer periphery of the large shaft 11 After lubricating, the inside of the closed container 1 is returned. On the other hand, part of the refrigerating machine oil divided at the end of the orbiting scroll shaft 9 is divided into an oil path 27 provided at the center of the driven shaft 9 of the orbiting scroll, an oil path 28 provided at the end plate 6, and an oil path 28. Through the narrowing portion 29 installed in the inside, it is jetted from above the end plate 6 to the outer peripheral portion of the orbiting scroll 5.
[0012]
As shown in FIG. 2, since the entrance of the oil path 27 is provided below the center of the circular cross section on the driven shaft 9 of the orbiting scroll, the amount of refrigerating machine oil pumped by the oil pump during low-speed operation is reduced, and the orbiting scroll is driven. Even if the oil level at the end of the driven shaft 9 is lowered, the refrigerating machine oil is reliably supplied to the compression chamber 8 from the oil path 27 of the driven shaft 9 of the orbiting scroll, and the efficiency is high. Driving can be maintained.
[0013]
Further, since the oil path 28 is provided in the end plate 6 of the orbiting scroll 5 so that the outlet is located above the end plate 6, the oil is supplied to the compression chamber 8 through the oil paths 27 and 28 and the throttle portion 29. The refrigerating machine oil is ejected from above the end plate 6, and the refrigerating machine oil improves the lubrication of both the upper and lower key portions of the Oldham ring 16, and the reciprocating key portion and the mating key groove portion. Wear is reduced.
[0014]
【The invention's effect】
As is apparent from the above embodiment, according to the first aspect of the present invention, the outlet of the oil path provided in the end plate of the orbiting scroll is provided above the center of the end plate, so that the oil is supplied to the compression chamber. By discharging the sealing oil from above the end plate, oil can be supplied to both the key sliding portions above and below the Oldham ring, and wear of the key portion can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a scroll compressor according to the present invention; FIG. 2 (a) is a sectional view taken along line AA in FIG. 2 (a), and FIG. Cross-sectional view of scroll compressor
DESCRIPTION OF SYMBOLS 1 Closed container 2 Fixed scroll 5 Orbiting scroll 8 Compression chamber 9 Drive shaft 10 of orbiting scroll 10 Crankshaft 12 Bearing part 13 Orbiting bearing 16 Oldham ring 18 Electric motor 27 Oil path of orbiting scroll shaft 28 Oil path of orbiting scroll end plate 29 Throttle Department

Claims (1)

A fixed scroll and an orbiting scroll in which spiral blades are provided on one surface of each end plate and the respective blades are meshed with each other; a crankshaft for eccentrically driving the orbiting scroll; and a bearing component for supporting the crankshaft. And a scroll compression mechanism including an Oldham ring for restraining the rotation of the orbiting scroll, and an electric motor for driving the crankshaft and the scroll compression mechanism are arranged in a cylindrical hermetic container installed substantially horizontally. The discharge gas pressure is applied to the space in the closed container, and the refrigerating machine oil sucked up from the end of the crankshaft is supplied to the scroll compression mechanism for lubrication of a sliding portion. A part of the refrigerating machine oil is supplied to a compression chamber formed by spiral blades through an oil path provided on a shaft and an end plate. The entrance of the oil path provided on the driven shaft of the rotary scroll is provided below the center of the circular cross section, and the exit of the oil path provided on the end plate of the orbiting scroll is provided above the center of the end plate. Become a scroll compressor.

Images