JPS6346707Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a scroll compressor that compresses air while supplying oil when compressing, for example, air or a refrigerant (hereinafter referred to as air).

Generally speaking, among scroll compressors, an oil-cooled scroll compressor supplies oil to each part of the compressor, cools, lubricates, and seals each part, and compresses the air sucked in from the suction port in the compression chamber. This compressed air is then discharged together with oil into an oil separation tank, and clean air from which oil has been removed in the oil separation tank is supplied to the air tank and pneumatic equipment.

For this reason, as this type of scroll compressor, the one shown in FIG. 1 is known.

That is, in FIG. 1, 1 is a casing, and the casing 1 is formed from a bearing portion 1A and a large diameter cylindrical portion 1B. 2 is a bearing 3 attached to the bearing portion 1A.
A and 3B, the drive shaft is rotatably supported. One end of the drive shaft 2 protrudes outside the casing 1 and is connected to a motor (not shown), and the other end protrudes into the cylindrical portion 1B and is connected to a crank. It is set to 2A.
Then, the crank 2 is connected to the axis O ₁ of the drive shaft 2.
The axis O ₂ of A is eccentric by a distance δ.

Reference numeral 4 denotes an orbiting scroll rotatably supported by the crank 2A of the drive shaft 2 via a bearing 5, and the orbiting scroll 4 is provided on the same axis as the axis O ₂ of the crank 2A. A wrap portion 4B formed in an involute or a curved shape close to an involute is formed on the lower surface side of the end plate portion 4A of the orbiting scroll 4.

A fixed scroll 6 is fixed to the opening side of the cylindrical portion 1B of the casing 1, and the fixed scroll 6 is provided so as to be coaxial with the axis _O1 of the drive shaft 2. A wrap portion 6B made of an involute or a curve close to an involute is formed on the upper surface side of the end plate portion 6A of the fixed scroll 6, and the wrap portion 6B is arranged so as to overlap the wrap portion 4B of the orbiting scroll 4 with a predetermined angle shift. A plurality of compression chambers 7 are provided, and each of the lap portions 4B and 6B has a plurality of compression chambers 7 which become a sealed space by slidingly contacting each other.
is formed.

Reference numeral 8 denotes a suction port formed on the side surface of the fixed scroll 6, and one side of the suction port 8 is connected to a suction filter 10 via a pressure regulating valve 9 that adjusts the amount of suction air.
The other side of the suction port 8 opens into the compression chamber 7 located at the outermost side, and is designed to suck in external air while the orbiting scroll 4 rotates. On the other hand, reference numeral 11 denotes a discharge port provided approximately at the center of the fixed scroll 6. From the discharge port 11, air that is continuously compressed in the compression chamber 7 while the orbiting scroll 4 rotates is transferred to an oil separation tank, which will be described later. It is designed to be discharged together with oil inside.

Reference numeral 12 denotes an oil separation tank made of a cylindrical body with a bottom, and the opening side of the oil separation tank 12 is fixed to the lower surface of the end plate portion 6A of the fixed scroll 6. The oil separation tank 12 is divided into an oil separation chamber 12A and an oil reservoir chamber 12B by a seal plate 13 provided at an intermediate position. It communicates through a plurality of ventilation holes 14 formed in. Further, a cylindrical oil separation element 15 is provided in the oil separation chamber 12A, and the oil separation element 15 is connected to the ventilation hole 14.
The oil contained in the compressed air supplied into the cylinder via the cylinder is separated to produce clean air, while a predetermined amount of oil 16 is stored in the oil reservoir chamber 12B.

Reference numeral 17 denotes a discharge pipe that leads compressed air discharged from the discharge port 11 to the oil reservoir chamber 12B together with oil;
One end of 7 is connected to the discharge port 11, the middle part passes through the cylinder of the oil separation element 15, and the other end opens to the upper part of the oil reservoir chamber 12B via the seal plate 13. In the figure, reference numeral 18 denotes a baffle plate disposed close to and parallel to the seal plate 13 at the upper part of the oil reservoir chamber 12B. Direct flow into the separation element 15 is prevented. Reference numeral 19 denotes a drain outlet opening at the bottom of the oil separation tank 12. A drain stock 20 is provided at the drain port 19, and by manually opening and closing the drain stock 20, drain and waste oil can be discharged. It is done like this.

On the other hand, 21 is the oil separation chamber 12 of the oil separation tank 12.
An air outlet opening in the side wall A. One end of a discharge pipe 22 is connected to the outlet 21, and the other end is connected to an air tank or a pneumatic tool (none of which is shown). There is a safety valve 2 in the middle of
3 is provided.

Furthermore, 24 is an oil reservoir chamber 12 of the oil separation tank 12.
An oil outlet opening located below the oil level of the oil 16 on the B side wall, and an oil pipe 25,
One ends of 26 and 27 are connected. The other end of the oil pipe 25 is connected to the sliding surface of the orbiting scroll 4 and the fixed scroll 6 via an oil filler port 28 and an annular groove 29 formed in the cylindrical portion 1B of the casing 1, and an oil passage 30 of the fixed scroll 6. Supply oil, oil piping 2
The other end of the oil pipe 27 is connected to the pressure regulating valve 9 to supply pilot pressure, and the other end of the oil pipe 27 is used to supply oil into the compression chamber 7 through an oil supply port 31 formed in the fixed scroll 6 and an oil passage 32. do. On the other hand, 33 is a seal plate 1 on the side wall of the oil separation chamber 12A of the oil separation tank 12.
An oil outlet 34 is an oil pipe whose one end is connected to the oil outlet 33.
The other end of the bearing 4 is adapted to supply oil to the bearings 3A, 3B, 5, etc. through an oil supply port 35 formed in the bearing portion 1A of the casing 1.

In the figure, reference numeral 36 indicates an Oldham joint as a rotation prevention mechanism, and when the drive shaft 2 is rotated, the Oldham joint 36 moves the orbiting scroll 4 along the axis O ₁ of the drive shaft 2.
It guides the object to revolve around the center with a radius of δ. Further, 37 is a balance weight fixed to the drive shaft 2.

The conventional technology is constructed as described above, but when the motor rotates, the rotation is transmitted to the orbiting scroll 4 via the drive shaft 2 and the bearing 5, and the orbiting scroll 4 is guided by the Oldham joint 36 and connected to the fixed scroll. Perform a circular motion relative to 6. The air sucked in from the suction port 8 via the suction filter 10 and the pressure regulating valve 9 is gradually pressurized in the compression chamber 7, and after being raised to a predetermined pressure, the air is passed through the discharge port 11 to the discharge pipe 17. The oil is discharged into the oil reservoir chamber 12B of the oil separation tank 12 through the oil separation tank 12. Furthermore, the compressed air in the oil reservoir chamber 12 is guided into the cylinder of the oil separation element 15 through the vent hole 14, and while passing through the element 15, the oil that has become a mist is removed and the air becomes clean. Air is air outlet 2
1 is supplied to an air tank or the like via a discharge pipe 22. Note that the safety valve 23 is activated when the discharge pressure becomes high.

On the other hand, during compression operation, the inside of the oil separation tank 12 has the same pressure as the discharge pressure, so the oil inside this tank flows through the oil outlet 24, the oil pipe 25, the oil supply port 28, and the annular groove 2.
9. The oil is supplied to the sliding surfaces of the orbiting scroll 4 and the fixed scroll 6 through the oil passage 30, and performs lubrication and sealing between them. Further, oil from the oil outlet 24 is supplied into the compression chamber 7 via an oil pipe 27, an oil supply port 31, and an oil passage 32, and
Performs lubrication, sealing, and cooling between B and 6B. On the other hand, the oil separated by the oil separation element 15 is supplied from the oil outlet 33 to the bearings 3A, 3B, 5, the Oldham joint 36, etc. via the oil pipe 34 and the oil supply port 35. The oil supplied to each of these parts is discharged together with compressed air from the discharge port 11 toward the oil separation tank 12, and smooth compression operation is performed.

Further, by constantly supplying pressure oil as pilot pressure to the pressure regulating valve 9 through the oil pipe 26, when the inside of the oil separation tank 12 reaches a predetermined pressure, the pressure regulating valve 9 is operated in the closing direction. to reduce the amount of intake air and create a no-load operating condition.

However, the prior art described above has various drawbacks as follows. First, a scroll compressor generates compression heat during the compression process, and the orbiting scroll 4, fixed scroll 6, etc. reach high temperatures, which not only reduces compression efficiency but also causes early deterioration of seal members and the like. For this reason, oil is supplied into the compression chamber 7 through the oil pipe 27, oil supply port 31, and oil passage 32 to cool the compression chamber 17, each scroll 4, 6, etc., but a large amount of oil The drawback was that a sufficient cooling effect could not be achieved unless the water was circulated. For this reason, the oil separation tank needed to be large in shape, which had the disadvantage of requiring a large installation space.

Secondly, in an oil-cooled compressor, the oil separation tank is exposed to the outside air and cooled, and the oil inside is also cooled, which may cause drainage. For this reason, in models that perform intermittent compression operation, the oil separation tank is surrounded by heat insulating material to enhance the heat retention effect, but this method has the disadvantage of requiring separate heat insulating materials, holders, etc. It was hot.

Third, when the oil separation tank is cooled to room temperature, such as at the beginning of compression operation, the compressed air discharged from the discharge port is cooled by oil and drain is generated, causing the oil separation tank and the oil inside to be compressed. The drawback was that a large amount of drainage was generated until the temperature rose due to heat (usually about 15 to 30 minutes).

The present invention improves the drawbacks of the prior art as described above, and provides a scroll compressor that can enhance the cooling effect of the fixed scroll on the compression element side and enhance the heat retention effect on the oil separation tank side. The purpose is to

In order to achieve the above purpose, the features of the present invention are as follows:
The fixed scroll is constructed by integrally forming a wrap part and a cylindrical part extending on the opposite side of the wrap part from the same material, and a bottom cover is fixed to the cylindrical part to separate oil. The reason lies in the configuration of the tank.

Hereinafter, the present invention will be described together with the embodiment shown in FIG. 2. The same components as shown in FIG.

In the figure, 41 indicates a fixed scroll, and the fixed scroll 41 includes an end plate portion 41A, a wrap portion 41B erected from the bottom side of the end plate portion 41A, and a cylinder extending in the axial direction on the lower surface side of the end plate portion 41A. Section 41C and
Flange portion 41 formed at the lower end of the cylindrical portion 41C
D, and these are made of the same material. The fixed scroll 41 has a suction port 42 formed on the side surface of the end plate portion 41A, and a discharge port 43 is formed at approximately the center of the end plate portion 41A. A compression chamber is formed while the wrap portion of the orbiting scroll rotates while slidingly contacting the wrap portion 41B of the scroll 41, and the air sucked in from the suction port 42 is compressed in the compression chamber and is discharged from the discharge port 43. is being done. Also, fixed scroll 4
1 has an air outlet 4 at the upper position of the cylindrical portion 41C.
4 is formed, and an oil outlet 45 is formed at a lower position thereof. Note that the air outlet 44
corresponds to the air outlet 21 in FIG. 1, and the oil outlet 45 also corresponds to the outlet 33 in FIG.

Further, 46 is a bottom cover made of a cylinder with a bottom, and the bottom cover 4
A flange portion 46A is formed on the upper surface side of 6. An oil outlet 47 is provided on the middle side of the bottom cover 46.
is formed, and a drain outlet 48 is formed on the bottom surface, and a drain socket 49 is provided in the drain outlet 48. Note that the oil outlet 47 corresponds to the oil outlet 24 in FIG. 1, and the same drain outlet 48 corresponds to the drain outlet 19 in FIG.

Here, in the present invention, the fixed scroll 4
1 flange portion 41D and the flange portion 4 of the bottom cover 45
6A with a plurality of bolts and nuts 50, an oil separation tank 51 is formed by the cylindrical portion 41C and the bottom cover 46.

Further, the oil separation tank 51 is connected to the oil separation chamber 51 by a seal plate 52 provided in the cylindrical portion 41C.
A and an oil reservoir chamber 51B, and an oil separation chamber 51A
The oil reservoir chamber 51B communicates with the oil reservoir chamber 51B through a ventilation hole 53 formed in the seal plate 52, as in the case of FIG. Further, a cylindrical portion 4 is provided in the oil separation chamber 51A.
A cylindrical oil separation element 54 located inside 1C
are arranged such that their upper and lower positions are fixed by brackets 55, 55. On the other hand, a predetermined amount of oil 56 is stored in the oil reservoir chamber 51B. In the figure, 57 is a discharge pipe through which the mixture of compressed air and oil discharged from the discharge port 43 is guided to the oil reservoir chamber 51B. One end of the discharge pipe 57 is connected to the discharge port 43, and the other end is connected to the oil reservoir chamber 51B. It opens above the oil surface of the oil 56 via the separation element 54 and the seal plate 13.
58 is a full plate.

The present invention is constructed as described above, but as in the prior art, the mixture of compressed air and oil compressed in the compression chamber is discharged from the discharge port 43 through the discharge pipe 57 into the oil reservoir chamber 51B. It is discharged. This oil sump chamber 51
Compressed air B is guided into the oil separation element 54 through the vent hole 53, and while passing through the element 54, oil is removed and the clean air is discharged from the air outlet 44. On the other hand, oil outlet 4
The oil from 5 and 47 is supplied to the required parts and is used for lubrication, sealing, and cooling.

However, in the present invention, the cylindrical portion 41C constituting the oil separation tank 51 is the same member as the end plate portion 41A and the wrap portion 41B, and the fixed scroll 4
1, the compression heat generated when the orbiting scroll and the fixed scroll 41 rotate relative to each other to perform a compression action is transferred to the end plate portion 41A and the wrap portion 4.
Heat is immediately transferred from 1B to cylindrical portion 41C. As a result, when viewed from the compressor side, the cylindrical portion 41C functions as a heat dissipation fin, effectively radiating compression heat from the cylindrical portion 41C, and reducing the temperature rise of the compressor. Therefore, the amount of circulating oil to be supplied from the oil outlets 45, 47 to the required parts can be reduced, and reducing the amount of circulating oil means that the amount of oil 56 can be reduced. The shape of the oil separation tank 51 can be reduced in size.

Furthermore, when viewed from the oil separation tank 51 side, the compression heat generated during the compression process is immediately transferred to the cylindrical portion 41C that constitutes the oil separation tank 51, so that the oil separation tank 51 appears to have a heating element integrated into it. This is useful as a heat insulating effect for the oil separation tank 51, and there is no need to surround it with a separate heat insulating member as in the prior art, and the installation of a heat insulating member can be simplified.

As described in detail above, the scroll compressor according to the present invention can enhance the heat dissipation effect of the fixed scroll, so it can not only increase the compression efficiency but also reduce the amount of circulating oil. Therefore, the shape of the oil separation tank can be reduced in size, and deterioration of the sealing member due to high temperatures can be prevented. In addition, since the heat insulation effect of the oil separation tank can be increased, there is no need to surround it with heat insulation materials, etc., and the number of parts can be reduced. This has the advantage of being able to minimize the amount of damage.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a conventional scroll compressor, and FIG. 2 is a longitudinal sectional view showing a fixed scroll and an oil separation tank portion of the scroll compressor of the present invention. DESCRIPTION OF SYMBOLS 1... Casing, 2... Rotating shaft, 4... Orbiting scroll, 4B... Wrap part, 41... Fixed scroll, 41A... End plate part, 41B... Wrap part, 41C... Cylindrical part, 42... Suction port, 43...
...Discharge port, 46...Bottom cover, 51...Oil separation tank, 52...Seal plate, 54...Oil separation element, 56...Oil, 57...Discharge pipe.

Claims (1)

[Scope of utility model registration request] A compression chamber is formed in which the air sucked in from the suction port is compressed while the wrap portion of the orbiting scroll rotates while slidingly contacting the wrap portion of the fixed scroll;
In a scroll compressor, the mixture of compressed air and oil compressed in the compression chamber is discharged from a discharge port provided in the fixed scroll to an oil separation tank. It is constructed by integrally forming a cylindrical part extending on the opposite side to the wrap part from the same material, and by fixing a bottom cover to the cylindrical part, oil separation between the cylindrical part and the bottom cover is achieved. A scroll compressor characterized by comprising a tank.