JPH0642471A - Scroll compressor - Google Patents

Abstract

PURPOSE:To improve sealing performance by arranging a discharge port for discharging gas from a compression chamber at the eccentric part of a drive shaft, when gas is compressed by shifting a compression chamber divided between a pair of scrolls to the center part, reducing capacity. CONSTITUTION:As for a scroll compressor, a fixed scroll 1 and a turning scroll 2 are meshed by shifting phase. The turning scroll 2 is connected with the eccentric parts 41 and 51 of the drive shaft 4 and the driven shaft 5 of the fixed scroll 1. A compression chamber 6 which is dividedly formed between both the scrolls 1 and 2 shifts to the center part little by little, and gas is compressed. In this case, a discharge port 42 for discharging gas from the compression chamber 6 which shifts to the center part is arranged at the eccentric part 41 of the drive shaft 4. Accordingly, the chip seal 13 of a fixed scroll 1 contacts the discharge port 42, and the sealing performance is improved without deteriorating durability, and the high pressure performance is achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view of a conventional scroll compressor. In the figure, 1 is a fixed scroll, 2 is an orbiting scroll provided adjacent to the fixed scroll,
Reference numeral 3 denotes a lid which is attached to the fixed scroll 1 by bolts 7 and covers the orbiting scroll 2. Reference numeral 4 denotes a drive which is rotatably held at the central portions of the fixed scroll 1 and the lid 3 via bearings 81 and 82. The shafts 5 are driven shafts that are rotatably held by the bearings 83 and 84 on the peripheral portion of the fixed scroll 1. Three driven shafts 5 are provided on the peripheral portion of the fixed scroll 1 at intervals of 120 degrees, but two of them are shown for convenience of illustration.

Reference numeral 11 is an end plate portion of the fixed scroll 1, 12 is a spiral blade standing on the end plate portion, and 13 is a tip seal attached to the tip of the spiral blade. Reference numeral 21 is an end plate portion of the orbiting scroll 2, 22 is a spiral blade provided upright on the end plate portion, and 23 is a tip seal attached to the tip of the spiral blade. The tip seals 13 and 23 are slidably in contact with the inner surfaces of the end plate portions 21 and 11 of the scrolls that face each other. The fixed scroll 1 and the orbiting scroll 2 have substantially the same spiral shape, are eccentric to each other by a predetermined distance, and are meshed with each other with an angular deviation of 180 degrees. The side surfaces of the spiral blades 12 and 22 are in line contact with each other at several points, and the tip seals 13 and 23 are in close contact with the inner surfaces of the end plate portions 21 and 11 of the scrolls, respectively, so that they are point-symmetric with respect to the center of the spiral A plurality of closed spaces 6 are formed in the. Reference numeral 24 is a discharge port provided in the end plate portion 21 of the orbiting scroll, and 31 is a gas delivery passage provided in the lid 3.

Reference numeral 41 is an eccentric portion of the drive shaft 4, and 51 is a driven shaft 5.
Is an eccentric part. The eccentric distance of the eccentric portion 41 with respect to the drive shaft 4 and the eccentric distance of the eccentric portion 51 with respect to the driven shaft 5 are equal to each other. The drive shaft 4 is rotatably connected to the central portion of the orbiting scroll 2 via the eccentric portion 41 and the bearing 85. The driven shaft 5 has an eccentric portion 51 and a bearing 8.
And 6 are rotatably connected to the peripheral portion of the orbiting scroll 2. The eccentric directions of the eccentric parts of the drive shaft 4 and the three driven shafts 5 are all the same. The driven shaft has an effect of preventing the orbiting scroll from rotating when the drive shaft rotates, and causing the orbiting scroll to orbit only.

In this device, when the drive shaft 4 rotates,
The orbiting scroll 2 makes an orbital revolving motion, and the gas sucked into the compression chamber 6 from a suction passage (not shown)
Is compressed as it moves to the center of the scroll while decreasing its volume, and the discharge port 24 and the gas delivery passage 3 are compressed.
It is sent to the outside as high-pressure gas via 1.

[0006]

In the conventional scroll compressor, the discharge port 24 is provided in the end plate portion 21 of the orbiting scroll. This part is the tip seal 1 provided at the tip of the spiral blade 12 of the fixed scroll.
Since 3 is the sliding position, there is a problem in the durability of the tip seal, and the sealing performance deteriorates, so it was difficult to increase the pressure of the compressor.

The present invention solves the above-mentioned drawbacks of the prior art and makes it possible to increase the pressure of a scroll compressor.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a fixed scroll and an orbiting scroll are meshed with each other with a phase shift, and a drive shaft and a driven shaft rotatably provided on the fixed scroll. In the scroll compressor that connects the orbiting scroll to each of the eccentric parts and moves the compression chamber formed between both scrolls to the center while reducing the volume, it moves to the center. Further, the present invention relates to a scroll compressor, characterized in that a discharge port for discharging gas from the compression chamber is provided in the eccentric portion of the drive shaft.

[0009]

In the present invention, since the discharge port is provided in the eccentric portion of the drive shaft, the tip seal of the fixed scroll does not come into contact with the discharge port and the durability is not impaired. Is possible.

[0010]

1 is a sectional view of an embodiment of the scroll compressor of the present invention. In the figure, 42 is a discharge port of a V-shaped path provided in the eccentric portion 41 of the drive shaft 4. With the installation of the discharge port 42, the discharge port conventionally provided in the end plate portion 21 of the orbiting scroll has been abolished. Reference numeral 9 is a seal ring additionally set between the drive shaft 4 and the fixed scroll 1. Reference numeral 5 denotes a driven shaft, which is conventionally provided with three, but in the present embodiment, only one is provided. Reference numeral 32 is an annular recess provided in the lid 3, 33 is an annular heat conducting portion provided on the inner and outer peripheral sides of the recess, and 34 is the heat conducting portion contacting the end plate 21 of the orbiting scroll. It is the tip seal attached to the part. The parts other than the above are the same as those of the conventional technique, and therefore the description thereof will be omitted.

In the conventional scroll compressor, as shown in FIG.
The discharge port 24 was provided in the end plate portion 21 of the orbiting scroll as shown in FIG. This part is the tip seal 1 provided at the tip of the spiral blade 12 of the fixed scroll.
Since 3 is the sliding position, there is a problem in the durability of the tip seal, and the sealing performance deteriorates, so it was difficult to increase the pressure of the compressor.

In this embodiment, the discharge port of the end plate is eliminated and the V-shaped discharge port 4 is provided in the eccentric portion 41 of the drive shaft.
By providing No. 2, the problem of deterioration of the durability and sealing performance of the tip seal is solved, and it is possible to increase the pressure of the compressor. Along with the increase in the pressure, a seal ring 9 is additionally installed between the drive shaft 4 and the fixed scroll 1, which makes it possible to maintain a higher pressure.

In the conventional scroll compressor, three driven shafts 5 are connected to the periphery of the orbiting scroll 2. For this reason, if the connection part and the like are included, the mass of the orbiting scroll 2 becomes large, and it is difficult to increase the speed of the compressor.

In this embodiment, since only three driven shafts 5 are provided, which is conventionally provided by three,
The connection portion of the orbiting scroll 2 around the driven shaft 5 is only one place, and the weight is reduced, so that the revolving orbiting motion of the orbiting scroll can be speeded up.
The rotation speed is in the class of 10,000 rotations per minute.

In the conventional scroll compressor, in order to prevent the temperature rise of the main body, it is necessary to provide an air-cooling fin at a position (not shown) for cooling, and there is a drawback that the outer shape of the compressor becomes large.

In this embodiment, the lid 3 is provided with an annular concave portion, and the heat conducting portions 33 are specifically provided on the inner peripheral side and the outer peripheral side of the concave portion. In the conventional technology, as shown in FIG. 2, since the lid 3 does not have the concave portion, the orbiting scroll 2 and the lid 3 are in even contact with each other at first glance, and sufficient heat conduction from the orbiting scroll to the lid is possible. Although it seems that there is one, in reality the orbiting scroll was deformed by heat and pressure, the contact parts were uneven, and sufficient heat conduction was not performed. In the present embodiment, as described above, the concave portion 32 is provided to absorb the deformation, and the heat conducting portions 33 are specifically provided on both sides of the concave portion to enable concentrated heat conduction and dissipate the heat of the scroll. It was done like this. As a result, it is now possible to radiate heat from the fixed scroll 1 mainly by the air-cooling fin, but also from the lid 3, so that the air-cooling fin can be eliminated and the compressor can be downsized. It is a thing. The tip seal 34 provided at the tip of the heat conducting portion 33 is installed to enable the above-mentioned high pressure to be retained.

As described above in detail, in the present embodiment, (1) the high pressure due to the provision of the discharge port in the eccentric portion of the drive shaft to avoid contact between the discharge port and the tip seal of the spiral blade. Conversion. (2) Speed is increased by reducing the number of driven shafts and reducing the mass of the swivel part. (3) Miniaturization by providing a heat-conducting part specifically on the lid and allowing cooling from the lid. Is possible.

[0018]

According to the scroll compressor of the present invention,
Since the discharge port for discharging gas from the compression chamber that has moved to the central portion is provided in the eccentric portion of the drive shaft, the discharge gas can be increased in pressure.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a scroll compressor of the present invention.

FIG. 2 is a sectional view of a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 11 End plate part 12 Spiral blade 13 Tip seal 2 Orbiting scroll 21 End plate part 22 Spiral blade 23 Chip seal 24 Discharge port (conventional) 3 Lid 31 Gas delivery passage 32 Recess 33 Heat transfer part 34 Chip seal 4 Drive shaft 41 eccentric part 42 discharge port (example) 5 driven shaft 51 eccentric part 6 compression chamber 7 bolt 81 bearing 82 bearing 83 bearing 84 bearing 85 bearing 86 bearing 9 seal ring

Claims (1)

[Claims] 1. A fixed scroll and an orbiting scroll are meshed with each other with a phase shift, and the orbiting scroll is connected to each eccentric portion of a drive shaft and a driven shaft rotatably provided on the fixed scroll, and between the two scrolls. In a scroll compressor that compresses gas by moving the compression chamber formed at the center to the central part while reducing its volume, the discharge port for discharging the gas from the compression chamber that has moved to the central part is an eccentric part of the drive shaft. A scroll compressor characterized by being provided in the.