JP3286432B2 - Rotary scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary scroll compressor in which a driving scroll and a driven scroll are rotated in the same direction to perform compression.

[0002]

2. Description of the Related Art A rotary scroll compressor accommodates an electric element and a scroll compression element in a closed container. The scroll compression element is obtained by meshing a driving scroll and a driven scroll. There is a configuration in which a gas is sent to a plurality of compression spaces and is sent out as a high-pressure gas from a compression space whose volume is reduced by rotation of both scrolls.

FIG. 3 shows this rotary scroll compressor. Reference numeral 1 denotes a sealed container, in which an electric element 2 and a scroll compression element 3 are housed. The scroll compression element 3 includes a driving scroll 4, a driven scroll 5,
A main frame 6 supporting the driving scroll 4, an auxiliary frame 7 supporting the driven scroll 5, a regulating member 9 fixed to the driving scroll 4 via a cylindrical ring 8, and restricting movement of the driven scroll in the axial direction; 4
And an Oldham coupling 10 for rotating the driven scroll 5 and the driven scroll 5 in the same direction. The drive scroll 4 has a spiral wrap 12 provided on the lower surface of a head plate 11, and a drive shaft 13 supported by the main frame 6 stands up from the upper surface of the head plate 11 and is connected to the electric element 2. . The driven scroll 5 is provided with a spiral wrap 15 which meshes with the wrap 12 on the upper surface of the end plate 14,
A driven shaft 16 eccentric to the drive shaft 13 and supported by the auxiliary frame 7 extends downward from the lower surface of the end plate 14.

The engagement between the two wraps 12 and 15 is performed by disposing the end plates 11 and 14 in a hollow space 17 formed by the main frame 6 and the auxiliary frame 7. In addition, the scrolls 4 and 5 are rotated in the same direction by the Oldham coupling 10 disposed between the end plate 14 and the regulating member 9, and a plurality of compression spaces 18 formed by engagement of the wraps 12 and 15 are formed from outside. It is provided so as to be gradually reduced inward, and to perform compression by sequentially changing from a low-pressure compression space to an intermediate-pressure compression space, and from an intermediate-pressure compression space to a high-pressure compression space.

[0005] A suction port 1 is provided on the lower side of the closed container 1.
9 is disposed facing the bearing portion 20 of the auxiliary frame 7, and a discharge port 21 is disposed on the upper side of the sealed container 1, and gas (refrigerant) entering from the suction port 19 is provided.
Is sent from the driven scroll 5 side to the outer compression space 18, the pressure is increased by the reduction accompanying the shift of the compression space 18 to the center side, and the gas is sent out above the sealed container 1 through the drive scroll 4 side. Is discharged from the discharge port 21 to the outside of the container. A passage for passing gas is formed in both scrolls 4 and 5. In driving scroll 4,
A discharge passage 22 extends through the drive shaft 13 in the longitudinal direction thereof. Further, the driven scroll 5 is provided with a suction passage 25 including a gas passage 23 at the driven shaft 16 and a suction lateral hole 24 extending in a radial direction of the end plate 14.
Further, an empty chamber 26 is located in the bearing portion 20, and the suction port 19 communicates with the empty chamber 26.
The gas is supplied to the low-pressure compression space 18 through the suction port 19, the empty space 26, and the suction passage 25.

In this rotary scroll compressor, the pressure of the high-pressure gas sent out through the discharge passage 22 is used to
An oil feed path 2 for feeding oil from an oil sump 27 set below the auxiliary frame 7 inside the closed casing 1 and below the end plate 14 of the driven scroll 5.
8 are provided. As shown in the figure, the oil feed path 28 faces the inner surface of the rear bearing hole 29 raised from the lower surface of the bearing portion 20, and forms a ramp formed by the inner surface recess of the bearing hole 29 and the outer peripheral surface of the driven shaft 16. After that, it reaches the lower surface side of the end plate 14.

[0007]

As described above, the rotary scroll compressor has an oil feed path, and the oil is fed from the oil reservoir to the lower surface of the end plate of the driven scroll while lubricating around the driven shaft. It also flows into. However, the oil passing through this oil feed path may be foamy, and if the foamy oil continues to flow, the lubricating action is not properly exerted, and the durability of the bearing portion is reduced. Cause problems. Further, if the clearance between the driven shaft and the bearing hole is large, oil flows from the gap into the empty chamber 26, which causes a problem of oil discharge.

In view of the above circumstances, in the present invention, the oil from the oil reservoir is always supplied in a liquid state around the driven shaft, and even when the clearance between the bearing surface and the driven shaft is large, the oil does not flow into the empty chamber. It is an object of the present invention to prevent a decrease in durability of a bearing portion and eliminate oil discharge.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and a head plate of a driving scroll and a head plate of a driven scroll are arranged in a hollow chamber formed of a frame surrounding them. A plurality of compression spaces formed by meshing of wraps provided in the drive scroll and the driven scroll are gradually reduced inward from the outside by rotation of the driven scroll and the driven scroll, and sent out to the compression space through a gas suction path provided in the driven scroll. The compressed gas is compressed by reducing the compression space, and the oil is driven from the oil sump from the oil sump below the frame to the head plate of the driven scroll via the bearing portion of the frame that supports the driven scroll. In a rotary scroll compressor having an oil feed path for feeding a lower surface of a scroll head plate, the bearing portion is provided. At the lower part of the bearing hole, an annular lip seal whose inner peripheral edge raised toward the shaft of the driven scroll slides around the axis is attached, an oil receiver is provided on the lip seal, and the oil is supplied in the oil feed path. An object of the present invention is to provide a rotary scroll compressor characterized in that a receiver is interposed and solve the above-mentioned problem.

[0010]

According to the present invention, since the oil receiver is provided on the lip seal that slides around the driven shaft, the oil received in the form of foam from the oil reservoir is prevented from foaming. The lubricating oil becomes liquid and is fed to the lower surface of the head plate while lubricating around the driven shaft as liquid oil. Since the lip seal is present around the driven shaft, it is possible to prevent oil from flowing into the vacant space when the clearance between the bearing hole and the driven shaft is large.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the embodiments shown in FIGS. In addition, the same reference numerals are given to portions having the same configuration as the conventional example shown in FIG.
In the figure, reference numeral 30 denotes a lip seal, and the lip seal 30 has an inner peripheral edge 31 rising forward toward the driven shaft 16.
A tubular body 32 that slides around 6 and forms a bearing hole 29 of the bearing portion 20 as shown in FIG.
Are attached to the lower part of the device via a support 33 in two vertical stages. The space on the upper surface of the lip seal 30 is provided as an oil receiver 34. As shown in FIG. 1, the oil feed path 28 is opened from the lowermost surface of the bearing portion 20 and is opened on the oil receiver 34 side. An oil passage 34 is provided between the inner concave portion of the bearing hole 29 formed by the body 32 and the inclined path 36 formed between the driven shaft 16. As a result, the oil from the oil sump 27 passes through the passage 3
5. The oil is fed to the lower surface of the end plate 14 through the oil receiver 34 and the inclined path 36, and the oil passing through the passage 35 in a foamy form from the oil reservoir 27 is once suppressed by the oil receiver 34 to be in a liquid state. Followed shaft 16 in proper condition
Becomes lubricating around. Even if the clearance between the bearing hole 29 and the driven shaft 16 is wide, the lip seal 30 prevents the lip seal 30 from flowing into the empty space 26.

[0012]

As described above, in the rotary scroll compressor according to the present invention, the head plate of the driving scroll and the head plate of the driven scroll are arranged in a hollow chamber formed of a frame surrounding them, and are provided on the two head plates. The plurality of compression spaces formed by meshing of the wraps are gradually reduced from the outside to the inside by the rotation of the driving scroll and the driven scroll, and the gas sent out to the compression space through the gas suction path provided in the driven scroll. From the oil reservoir under the frame to the head plate of the driven scroll through the bearing portion of the frame that supports the driven scroll, and the oil from the oil reservoir to the head plate of the driven scroll. Having an oil feed path for feeding the oil to the lower surface side of the An annular lip seal whose inner peripheral edge raised toward the crawl axis slides around the axis is attached, an oil receiver is provided on the lip seal, and the oil receiver is interposed in the oil feed path. By this, the oil flowing in the oil feed path in the bubble state is suppressed by the oil receiver, and the bubbling is suppressed, it becomes a proper liquid, lubricating around the driven shaft, and on the lower side of the end plate of the driven scroll And the durability of the bearing portion is improved. Furthermore, even when the clearance between the bearing hole and the driven shaft is wide, the lip seal is in sliding contact with the driven shaft, so that it does not flow into the vacant space and oil discharge is prevented. It has an excellent effect.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a rotary scroll compressor according to the present invention.

FIG. 2 is an explanatory diagram showing a main part of one embodiment.

FIG. 3 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Closed container 5 ... Followed scroll 7 ... Auxiliary frame 14 ... End plate of driven scroll 16 ... Followed shaft 20 ... Bearing part 26 ... Empty room 27 ... Oil reservoir 28 ... Oil feed path 29 ... Bearing hole 30 ... Lip seal 34 ... Oil received

Continued on the front page (72) Inventor Toshihiko Mitsunaga 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (58) Field surveyed (Int. Cl. ⁷ , DB name) F04C 18/02 311 F04C 27/00 331 F04C 29/02

Claims (1)

(57) [Claims] An end plate of a driving scroll and an end plate of a driven scroll are arranged in a hollow chamber formed of a frame surrounding them, and a plurality of compression spaces formed by engagement of wraps provided on both end plates are driven by the driving scroll and a driven space. A frame that is gradually reduced inward from the outside by rotation with a scroll, and that compresses gas sent to a compression space through a gas suction path provided in the driven scroll by reducing the compression space; In a rotary scroll compressor having an oil feed path extending from a lower oil reservoir to a head plate of a driven scroll through a bearing portion of a frame that supports the driven scroll, and sending oil from the oil reservoir to a lower surface side of the head plate of the driven scroll. The lower part of the bearing hole of the bearing part, Edges are fitted with sliding contact annular lip seal about the shaft, the oil received provided on the lip seals, rotary scroll compressor, characterized in city obtained by interposing the oil received during the oil feed path.