JP2000080993A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform stable operation for a long period by sealing gas interposing a seal member between an end part of a rotary shaft and an auxiliary bearing part. SOLUTION: A scroll compressor 1 is provided with a sealed container 2 formed in such a cylindrical shape that both ends are closed. An electrically driven element 3 and a scroll compressing element 4 driven by the electrically driven element 3 are housed in the sealed container 2. Lubricating oil (b) is stored in the sealed container 2 to a prescribed level, and is sucked from an oil introducing pipe 20 of a differential oiling part 19 by a differential pressure. And then, the lubricating oil (b) is supplied to a sliding part including a bearing part 9 via an oil passage 25 in a rotary shaft 7, and is used while circulating. Gas sealing is performed interposing a seal member 28 between an end part of a rotary shaft 7 and an auxiliary bearing part 21. It is thus possible to perform a stable operation for a long period, and it is also possible to improve reliability.

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 or a refrigerator, and more particularly, to a plurality of scroll compressors formed by meshing a fixed scroll and an orbiting scroll. The present invention relates to a scroll compressor in which a compressed gas compressed in a compression chamber is discharged into a closed container and then discharged outside the closed container.

[0002]

2. Description of the Related Art Conventionally, as a scroll type compressor used in a refrigeration cycle of an air conditioner or the like, a system in which high-pressure refrigerant gas compressed by a scroll compression element is discharged into a closed container and then discharged outside the closed container. The pressure between the back surface of the orbiting scroll and the support frame is made lower than the high pressure (for example, 15 to 25 kg / cm ² ) in the closed container, and the end of the rotary shaft is rotated by utilizing this differential pressure. The lubricating oil contained in the closed container is sucked up from an oil supply section provided on the supporting sub-bearing section, and supplied to each sliding section such as a support frame via an oil passage provided in the rotating shaft. There is a scroll compressor. However, high-pressure refrigerant gas in the closed vessel may pass between the end of the rotary shaft and the sub-bearing portion and enter the oil passage provided in the rotary shaft, and the high-pressure refrigerant gas may When it enters, the lubrication of each sliding portion becomes insufficient, and there is a possibility that a serious problem such as a stoppage of the scroll compressor may occur.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to supply lubricating oil contained in a sealed container from a differential pressure type oil supply section provided in a sub-bearing section which supports an end of a rotating shaft. Scroll type that supplies high pressure refrigerant gas compressed by the scroll compression element into the sealed container and then discharges out of the sealed container by supplying and circulating to each sliding part through the oil passage provided in A compressor, in which high-pressure refrigerant gas does not enter the oil passage provided in the rotary shaft, passing between an end of the rotary shaft and a sub-bearing portion that supports the end of the rotary shaft. did,
An object of the present invention is to provide a highly reliable scroll compressor that can be operated stably for a long period of time.

[0004]

The inventors of the present invention have conducted intensive studies on such a problem, and as a result, have found that a gas seal is provided by interposing a seal member such as a Teflon rubber seal ring between the end of the rotating shaft and the auxiliary bearing. As a result, the present inventors have found that the problems can be solved, and have accomplished the present invention.

That is, according to the first aspect of the present invention, there is provided an electric element, a scroll compression element driven by a rotating shaft of the electric element, a lubricating oil contained in the closed container, An auxiliary bearing portion that supports the end of the rotary shaft, and a differential pressure type oil supply portion provided in the auxiliary bearing portion, and a lubricating oil is provided from the oil supply portion through an oil passage provided in the rotary shaft. A scroll type compressor for supplying and circulating to each sliding portion for use, wherein a gas seal is provided by interposing a seal member between an end of the rotary shaft and the auxiliary bearing portion. Type compressor.

According to a second aspect of the present invention, there is provided the scroll type compressor according to the first aspect, wherein one end of the rotary shaft is provided.
One or two or more seal rings are mounted, one or two or more seal rings are mounted on the auxiliary bearing portion, or both are used to perform gas sealing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings shown in FIGS. FIG. 1 is a cross-sectional view showing the overall configuration of the scroll compressor of the present invention. FIG. 2 is an enlarged explanatory view of one embodiment of the differential pressure type refueling unit of the scroll compressor shown in FIG. FIG. 3 is an enlarged explanatory view of another embodiment of the differential pressure type refueling unit of the scroll compressor shown in FIG. FIG. 4 is an enlarged explanatory view of a differential pressure type oil supply section of a conventional scroll compressor.

The compressor shown in FIG. 1 is a scroll type compressor 1 having a closed container 2 formed in a cylindrical shape with both ends closed. An electric element 3 and a scroll compression element 4 driven by the electric element 3 are accommodated in the closed container 2.

The electric element 3 has a stator 5 fixed inside the closed casing 2 and a rotor 6 located at the center of the stator 5, and the center of the rotor 6 has a shaft of the closed casing 2. A rotating shaft 7 oriented in the direction of the center is connected in a penetrating state, and one end of the rotating shaft 7 is penetrated through the center of a support frame 8 that supports the scroll compression element 4 and is rotatably supported. Here, the support frame 8 is fixedly connected to the inner wall surface of the closed container 2. The rotary shaft 7 is rotatably supported at one end on a halfway portion by a bearing 9 of a support frame 8, and the rotor 6 is supported on the inner wall surface side of the sealed container 2 via the rotary shaft 7 and the support frame 8. Have been.

The rotating shaft 7 penetrating the support frame 8
A pin portion (crank portion) 10 whose center is provided eccentrically with respect to the axis of the rotating shaft 7 is formed at the end of the shaft. An orbiting scroll 11 is connected to the pin portion 10. The orbiting scroll 11 has a boss hole portion 12 connected to the center of one side surface of the disc-shaped end plate by inserting a pin portion 10 and a spiral wrap 13 formed on the other side surface of the end plate. A fixed scroll 14 is connected to the support frame 8. The fixed scroll 14 has a spiral wrap 16 which is alternately positioned on the wrap 13 of the orbiting scroll 11 and forms a plurality of compression chambers 15.

A suction pipe 17 for the refrigerant gas penetrating through the closed casing 2 is connected to a side wall surface of the fixed scroll 14. At the center of the fixed scroll 14, a discharge port 18 for discharging the compressed refrigerant gas into the closed container 2 is provided. In addition, the suction side of the scroll compression element 4 for the refrigerant gas sucked from the suction pipe 17, the back surface of the orbiting scroll 11 (the surface on the side where the boss hole portion 12 of the end plate is located) and the support frame 8 swing. Since the scroll 11 is communicated with the peripheral edge of the end plate, the pressure during this period is almost as low as the refrigerant gas suction side, and lower than the pressure in the closed vessel 2.

The other end of the rotary shaft 7 has a differential pressure type lubrication unit 19.
Is provided. The oil supply section 19 is mounted in the closed container 2, supports one end of the rotating shaft 7, and has a sub-support frame 2 provided with an auxiliary bearing section 21 to which an oil introduction pipe 20 is mounted.
2 is provided. A bearing 23 is interposed between the auxiliary support frame 22 and the rotating shaft 7, and a receiving portion 24 of the bearing 23 is provided on the auxiliary bearing portion 21.

An oil passage 25 is formed in the rotary shaft 7 from one end to the other end. Rotating shaft 7
A small hole 26 communicating with the sliding surface of the bearing portion 9 from the oil passage 25 near the electric element 3 side of the portion supported by the bearing portion 9
Is provided. A helical groove 27 starting from the outlet of the small hole 26 and communicating with the small hole 26 on the surface of the rotating shaft 7 toward the pin portion 10 is formed in a portion where the rotating shaft 7 is supported by the bearing 9. It is provided halfway. The lubricating oil from one end of the rotating shaft 7 gas seals the sliding surface between the boss hole 12 and the pin portion 10, and the lubricating oil passing through the small hole 26 flows through the groove 27 to lubricate the sliding surface. Along with
The sliding surface on the pin portion 10 side from the small hole 26 is gas-sealed.

The sealed container 2 contains lubricating oil b to a predetermined level.
The lubricating oil b is sucked up from the oil introduction pipe 20 of the differential pressure type oil supply unit 19 by the above-mentioned differential pressure, passes through the oil passage 25 in the rotary shaft 7, and includes the respective sliding parts including the bearing part 9. To be used for circulation. The seal member 28 is interposed between the end of the rotating shaft 7 and the sub-bearing 21 for gas sealing.

When the operation of the scroll compressor 1 according to the present invention having the above-described configuration is started, the refrigerant gas is supplied to the suction pipe 17.
Is sucked into the outer peripheral portion of the scroll compression element 4 and gradually compressed toward the center to be compressed.
The lubricating oil discharged from the discharge port 18 provided at the center of the container 4 into the closed container 2 is separated in this space, and pulsation is reduced. The discharged gas flows through a passage (not shown) provided in the fixed scroll 14 and the support frame 8 as shown by a white arrow, goes to the electric element 3 side, and receives the centrifugal force due to the rotation of the rotor 6 and the stator 5 and the auxiliary support frame 22 The lubricating oil in the refrigerant gas is further separated by the baffle plate effect, etc.
The refrigerant gas from which the lubricating oil has been separated is discharged from the discharge pipe 29 to the outside of the closed container 2. The separated lubricating oil flows as shown by the black arrows, accumulates at the bottom of the closed container 2, and is circulated for use.

Since the seal member 28 is interposed between the end of the rotary shaft 7 and the sub-bearing portion 21 for gas sealing,
An oil passage 25 provided in the rotary shaft 7 through a space between the end of the rotary shaft 7 and the sub-bearing portion 21 through the high-pressure refrigerant gas in the closed container 2
Do not enter. The material, shape, and number of the seal member 28 may be any as long as the gas seal can be provided between the end of the rotating shaft 7 and the sub-bearing portion 21. The material may be an organic material, an inorganic material, or a combination thereof. The shape may be a ring shape, a U-shape or the like, or a combination thereof, and the number used may be one or two or more, and is not particularly limited.

In the differential pressure type lubrication unit 19 of the scroll type compressor according to the present invention shown in FIG. 2, a concave portion 28A is provided at the end of the rotating shaft 7, and a Teflon rubber seal ring as a seal member is provided in the concave portion 28A. Rotating shaft 7 with 28B
Is gas-sealed between the end portion of the bearing and the sub bearing portion 21.

In the differential pressure type lubricating section 19 of the scroll type compressor of the present invention shown in FIG.
8C, a seal ring 28D made of Teflon rubber is mounted as a seal member in the concave portion 28C, and gas is sealed between the end of the rotary shaft 7 and the sub-bearing portion 21.

On the other hand, in the differential pressure type lubrication section 19 of the conventional scroll compressor, as shown in FIG. 4, the gap between the end of the rotary shaft 7 and the sub-bearing section 21 is reduced as much as possible. Gas seal is interposed, so that the gas seal is not complete and the high-pressure refrigerant gas in the sealed container 2 is moved between the end of the rotary shaft 7 and the sub-bearing 21 from the direction shown by the arrow. Oil passage 25 provided in the rotating shaft 7
There was a problem of getting in.

In the above description of the scroll type compressor of the present invention, the horizontal type scroll type compressor of which the lubrication system is the differential pressure type has been described, but the scroll type compressor of the present invention is of the horizontal type. The present invention is not limited to this, and can be applied to a vertical-type scroll compressor in which the refueling method is a differential pressure method.

[0021]

According to the scroll compressor of the present invention, the high-pressure refrigerant gas is provided in the rotary shaft passing between the end of the rotary shaft and the sub-bearing supporting the end of the rotary shaft. Since it does not enter the oil passage, it can be operated stably for a long time and has high reliability.

[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 enlarged explanatory view of one embodiment of a differential pressure type oil supply section of the scroll compressor shown in FIG.

FIG. 3 is an enlarged explanatory view of another embodiment of the differential pressure type refueling section of the scroll compressor shown in FIG. 1;

FIG. 4 is an enlarged explanatory view of a differential pressure type oil supply section of a conventional scroll compressor.

[Explanation of symbols]

 b Lubricating oil 1 Scroll compressor of the present invention 2 Closed vessel 3 Electric element 4 Scroll compression element 7 Rotary shaft 19 Differential pressure lubrication unit 21 Secondary bearing unit 25 Oil passage 28 Seal member 28B, 28D Seal ring

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Kazuto Sugimoto, Inventor 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Takehiro Nishikawa Keihanhondori, Moriguchi-shi, Osaka 2-5-5 Sanyo Electric Co., Ltd. (72) Inventor Kazuaki Fujiwara 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. (reference) 3H029 AA02 AA15 AB03 BB01 BB16 CC16 CC17 CC20 CC33 CC39 3H039 AA02 AA03 AA06 AA12 BB11 BB15 CC12 CC19 CC31 CC34 CC35 CC42

Claims (2)

[Claims] 1. An electric element in a closed container, a scroll compression element driven by a rotating shaft of the electric element, a lubricating oil contained in the closed container, and an end of the rotating shaft. An auxiliary bearing portion and a differential pressure type oil supply portion provided in the auxiliary bearing portion, and lubricating oil is supplied from the oil supply portion to each sliding portion via an oil passage provided in the rotating shaft and circulated. A scroll compressor to be used, wherein a gas seal is performed by interposing a seal member between an end of the rotating shaft and the auxiliary bearing portion. 2. One or two or more seal rings are attached to the end of the rotating shaft, one or two or more seal rings are attached to the auxiliary bearing portion, or both are used together. 2. A gas seal is provided.
The scroll-type compressor as described.