JPH11107942A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type compressor which can be safely operated, by mounting an inexpensive bushing which has a high lubricity and a high wear-resistance, and which can be easily processed, for the inner surface of a bearing for a rotary shaft instead of using a conventional expensive carbon bushing. SOLUTION: In a scroll type compressor in which an oscillating scroll 12 which revolves being driven by a rotary shaft 6 of a motor element 2 is meshed with a stationary scroll 15 so as to compress intake coolant gas that is discharged into a closed container 1, and then is discharged outside therefrom, a rolled bushing 28 formed by rolling a metal plate formed, over its outer surface, with a lubricative and wear-resistant outer surface layer, with the outer surface layer being laid inside, is press fitted into the inner surface of a bearing for the rotary shaft 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor mounted on, for example, an air conditioner / refrigerator, and more particularly, to a compressed gas compressed by meshing a fixed scroll and an orbiting scroll. The present invention relates to a scroll-type compressor which discharges water into a closed container and then discharges the air out of the closed container.

[0002]

2. Description of the Related Art In a conventional scroll compressor having an electric element and a scroll compression element driven by a rotating shaft of the electric element in a closed container, for example,
When gas sealing the rotating shaft and bearing sliding surface with lubricating oil,
Since lubrication conditions are deteriorated on the inner surface of the bearing that requires a gas seal, a carbon bush or a ceramic bush or the like is usually mounted on the inner surface of the bearing having a high PV value to withstand the lubrication condition. However, as shown in FIG. 3, this carbon bush uses carbon solid 24 as a raw material and is formed by shaving to form a carbon bush 25. After press-fitting the carbon bush 25 into the bearing inner surface, the carbon bush 25 is finished. Since it is used so as to have a predetermined smoothness, an inner diameter, a clearance, and the like, there is a problem that it is troublesome and cost is increased.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scroll type compression system in which an inexpensive bush which is excellent in lubricity and wear resistance and which is easy to process and is mounted is used without using a carbon bush which increases the cost. Is to provide a machine.

[0004]

The present inventors have conducted intensive studies on such problems and found that the problems can be solved by using a wound bush having a surface layer having lubricity and wear resistance inside. The present invention has been accomplished.

That is, according to the first aspect of the present invention, an electric element, a scroll compression element driven by the electric element in a closed container, and a scroll compression element mounted in the closed container to support the scroll compression element A support frame provided with a bearing portion for supporting a rotating shaft of the electric element in the center, and a lubricating oil accommodated in the closed container and supplied to each sliding portion, wherein the scroll compression element is A fixed scroll having a spiral wrap on the back surface, and a spiral wrap revolving around the fixed scroll by driving the electric element, and the center of the back surface is eccentric with the axis of the rotation shaft and the rotation is performed. A plurality of compression chambers are formed by meshing with an orbiting scroll having a boss hole portion formed by connecting a pin portion provided at the end of the shaft, and sucking from outside the sealed container. A scroll compressor that compresses refrigerant gas in the compression chamber and discharges the gas into the closed container, and then discharges the gas outside the closed container, wherein the bearing portion is gas-sealed by the lubricating oil and A metal bush having a lubricating and abrasion-resistant surface layer is formed by press-fitting a winding bush formed by winding a metal plate having a surface layer having lubricity and wear resistance inside the bearing inner surface of the rotating shaft including the boss hole portion. This is a scroll type compressor characterized by the following.

According to a second aspect of the present invention, in the scroll compressor according to the first aspect, the metal plate having the surface layer has a porous sintered layer made of bronze powder impregnated with Teflon and lead. It is a steel plate.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described in detail with reference to FIG. FIG.
FIG. 1 is a cross-sectional view illustrating an overall configuration of a scroll compressor according to the present invention. FIG. 2 is an explanatory diagram showing a molding of a winding bush used in the scroll compressor of the present invention shown in FIG. 1 and a cross section thereof. The compressor shown in FIG. 1 is a scroll-type compressor 1A, which includes a closed container 1 formed in a cylindrical shape with both ends closed. An electric element 2 and a scroll compression element 3 driven by the electric element 2 are accommodated in the closed container 1.

The electric element 2 has a stator 4 fixed inside the closed casing 1 and a rotor 5 located at the center of the stator 4. A rotating shaft 6 oriented in the direction of one axial center is connected in a penetrating state, and one end of the rotating shaft 6 is penetrated through the center of a support frame 7 that supports the scroll compression element 3 and is rotatably supported. Here, the support frame 7 is connected and fixed to the inner wall surface of the closed container 1. The rotating shaft 6 is rotatably supported by a bearing 7A of the support frame 7 at an intermediate portion on one end side.
The rotor 5 is supported on the inner wall surface side of the closed casing 1 via a rotating shaft 6 and a support frame 7.

A pin (crank) 11 whose center is eccentric to the axis of the rotating shaft 6 is formed at the end of the rotating shaft 6 penetrating the support frame 7. An orbiting scroll 12 is connected to the pin portion 11.
The orbiting scroll 12 has a boss hole 13 connected to the center of one side surface of the disk-shaped end plate by inserting the pin portion 11 and a spiral wrap 14 formed on the other side surface of the end plate. . A fixed scroll 15 is connected to the support frame 7. The fixed scroll 15 is formed with a spiral wrap 16 which is alternately positioned on the wrap 14 of the orbiting scroll 12 and forms a plurality of compression chambers 17.

On the side wall surface of the fixed scroll 15, a refrigerant gas suction pipe 18 penetrated through the closed vessel 1 is provided.
Is connected. At the center of the fixed scroll 15, a discharge port 19 for discharging the compressed refrigerant gas into the closed casing 1 is provided. And the suction pipe 1
The orbiting scroll is provided between the suction side of the scroll compression element 3 for the refrigerant gas sucked in from the side 8, the back surface of the orbiting scroll 12 (the surface with the boss hole 13 of the end plate) and the support frame 7. Since the end faces of the 12 head plates are communicated with each other, the pressure during this period is substantially the same as the pressure on the refrigerant gas suction side and lower than the pressure in the closed vessel 1.

The other end of the rotary shaft 6 is provided with a differential pressure type lubrication unit 8. The oil supply unit 8 includes a sub-support frame 22 which is mounted in the closed container 1, supports one end of the rotating shaft 6, and includes a sub-bearing portion 21 to which the oil introduction pipe 9 is mounted. A bearing 23 is interposed between the auxiliary support frame 22 and the rotating shaft 6.

An oil passage 10 extending from one end to the other end of the rotary shaft 6 is formed in the rotary shaft 6, and a portion of the rotary shaft 6 supported by a bearing 7A is closer to the electric element 2 side. A small hole 26 communicating from the oil passage 10 to the sliding surface of the bearing 7A is provided in the oil passage 10. A helical groove 27 is formed on the surface of the rotating shaft 6 starting from the outlet of the small hole 26 and communicating with the small hole 26 toward the pin portion 11. A portion where the rotating shaft 6 is supported by the bearing portion 7 </ b> A. Up to the middle. The lubricating oil from one end of the rotating shaft 6 gas seals the sliding surface between the boss hole 13 and the pin portion 11, and the lubricating oil passing through the small hole 26 flows through the groove 27 and slides on the sliding surface. And a gas seal is formed on the sliding surface of the pin portion 11 side from the small hole 26.

The hermetically sealed container 1 contains a lubricating oil b to a predetermined level. The lubricating oil b is sucked up from the oil introduction pipe 9 of the oil supply unit 8 by the above-mentioned differential pressure, and Is sent to each sliding portion including the bearing portion 7A through an oil passage 10 provided in the above, and is circulated and used.

In the present invention, the bearing 7 having a high PV value is used.
A winding bush 28 is press-fitted onto the inner surfaces of the A and the boss hole 13 and used. As shown in FIG. 2, the winding bush 28 is formed by winding a metal plate 30 having a surface layer 29 excellent in lubricity and wear resistance with the surface layer 29 inside. A commercially available metal plate 30 having the surface layer 29 can be used. The cross section of the winding bush 28 includes, in order from the outside, a metal plate 30, a porous sintered layer 31 made of bronze powder, and a surface layer 32 impregnated with Teflon, lead powder and the like. Reference numeral 33 denotes a bronze powder.
Such a wound bush 28 is press-fitted into the bearing inner surface such as the bearing portion 7A and the boss hole portion 13 and then finish-worked, and can be easily mounted at a predetermined position in a good finished state. The wound bush 28 is excellent in lubricity and wear resistance, so that it can be used stably for a long period of time.

When the operation of the scroll type compressor 1A of the present invention configured as described above is started, the refrigerant gas is supplied to the suction pipe 1A.
8, the air is sucked into the outer peripheral portion of the scroll compression element 3 and gradually compressed to move to the center. The compressed air is then discharged from the discharge port 19 provided in the central portion of the fixed scroll 15 into the closed container 1. The entrained lubricating oil is separated and pulsation is reduced. The discharged gas flows through a passage (not shown) provided in the fixed scroll 15 and the support frame 7 as shown by a white arrow, goes to the electric element 2 side, and receives the centrifugal force due to the rotation of the rotor 5 and the stator 4 and the auxiliary support frame 22. The lubricating oil in the refrigerant gas is further separated by a baffle plate effect or the like, and the refrigerant gas from which the lubricating oil has been separated is discharged from the discharge pipe 20 to the outside of the closed container 1. The separated lubricating oil flows as shown by the black arrows, accumulates at the bottom of the closed container 1, and is circulated for use.

In the description of the scroll type compressor of the present invention, the horizontal type scroll type compressor has been described. However, the scroll type compressor of the present invention is not limited to the horizontal type. The present invention is also applicable to stationary scroll compressors and other types of scroll compressors.

[0017]

The scroll compressor according to the present invention is inexpensive because it uses a bush that is excellent in lubricity and wear resistance and is easy to process without using a carbon bush that increases the cost on the inner surface of the bearing. And it can be operated stably for a long time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of an embodiment of a scroll compressor according to the present invention.

FIG. 2 is an explanatory view showing a winding bush used in the scroll compressor of the present invention shown in FIG.

FIG. 3 is an explanatory view showing a carbon bush used in a conventional scroll compressor.

[Explanation of symbols]

 b Lubricating oil 1A Scroll compressor 1 Airtight container 2 Electric element 3 Scroll compression element 4 Stator 5 Rotor 6 Rotary shaft 7 Support frame 7A Bearing 8 Oil supply 9 Oil introduction pipe 10 Oil passage 11 Pin part 12 Oscillating scroll 13 Boss Hole 14, 16 Wrap 15 Fixed scroll 17 Compression chamber 18 Suction pipe 19 Discharge port 20 Discharge pipe 21 Secondary bearing section 22 Secondary support frame 23 Bearing 24 Carbon solid 25 Carbon bush 26 Small hole 27 Groove 28 Winding bush 29 Surface layer 30 Metal Plate 31 Porous sintered layer made of bronze powder 32 Surface layer made of Teflon and lead powder 33 Bronze powder

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Kazuaki Fujiwara 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Kenzo Matsumoto 2 Keihanhondori, Moriguchi-shi, Osaka 5-5-5 Sanyo Electric Co., Ltd. (72) Inventor Takehiro Nishikawa 2-5-1-5 Sanyo Electric Co., Ltd., Sanyo Electric Co., Ltd. (72) Inventor Takashi Sato Keihanmoto, Moriguchi, Osaka 2-5-5, Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. An electric element in a closed container, a scroll compression element driven by the electric element, a scroll compression element mounted in the closed container to support the scroll compression element, and a rotating shaft of the electric element in the center. A fixed scroll having a support frame provided with a bearing portion for supporting the shaft and lubricating oil contained in the closed container and supplied to each sliding portion, wherein the scroll compression element has a spiral wrap on the back surface A pin portion provided at the center of the back surface and eccentric with the axis of the rotating shaft at an end of the rotating shaft, the spiral portion having a spiral wrap that revolves by driving the electric element with respect to the fixed scroll. A plurality of compression chambers are formed by interlocking an orbiting scroll formed with a boss hole portion connected to the compression chamber, and a refrigerant gas sucked from outside the sealed container is compressed in the compression chamber to form a plurality of compression chambers. A scroll-type compressor configured to discharge into the closed container and then discharge out of the closed container, wherein the rotary shaft bearing includes the bearing portion and the boss hole portion gas-sealed by the lubricating oil. A scroll-type compressor comprising a metal plate having a lubricating and abrasion-resistant surface layer on its inner surface, and a press-fitting and mounting a winding bush formed by winding the metal plate with the surface layer inside. 2. The scroll mold according to claim 1, wherein the metal plate having the surface layer is a steel plate having a porous sintered layer made of bronze powder impregnated with Teflon (registered trademark) and lead. Compressor.