JP4484912B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a rotary hermetic scroll compressor that compresses refrigerant gas such as a refrigeration air conditioning system and has a forced oil pump.

  After the refrigerating machine oil enclosed in the compressor is supplied to each bearing portion by a forced oil pump, a part of the refrigerating machine oil is discharged into the case immediately before being supplied to the compression chamber formed by the fixed scroll and the orbiting scroll. In the scroll oil type scroll compressor, a partition wall such as a seal ring is provided that divides the intermediate pressure chamber containing the orbiting scroll and the Oldham ring into two chambers. And it is necessary to form a high-pressure chamber for storing refrigeration oil just before being supplied to the compression chamber by this partition, and a low-pressure chamber having a pressure sufficient to press the fixed scroll on the back of the orbiting scroll, It is necessary to provide an oil supply mechanism from the high pressure chamber to the low pressure chamber.

  In order to solve this problem, in Patent Document 1, a plurality of holes or grooves that can pass between the high-pressure chamber and the low-pressure chamber separated by a seal ring and do not communicate with the high-pressure chamber and the low-pressure chamber are provided. A mechanism for supplying oil from the high-pressure chamber to the low-pressure chamber by holding oil therein is employed.

  In addition, for the same problem, in Patent Document 2, a flange portion is provided on the outer periphery of the orbiting scroll bearing portion, a seal ring in contact with the flange portion is provided to form a high pressure chamber and a low pressure chamber, and the high pressure chamber is formed in the flange portion. And a plurality of through-holes serving as oil supply passages communicating with the low-pressure chamber, and a mechanism is provided in which all of the plurality of through-holes are always lubricated by opening the high-pressure chamber and the low-pressure chamber in communication. .

JP-A-9-228968 JP 2005-248772 A

  In Patent Document 1, the amount of oil supplied to the compression chamber by the oil supply mechanism from the high pressure chamber to the low pressure chamber depends on the motor rotation speed and the specification and number of the holes. There is a characteristic.

  In Patent Document 2, the amount of oil supplied to the compression chamber by the oil supply mechanism from the high pressure chamber to the low pressure chamber is the differential pressure between the high pressure chamber and the low pressure chamber and the specification and number of the communication holes used as an oil supply passage. Depends on the motor speed. The amount of oil supply according to the specification of the communication hole is determined by Formula 1, and when a plurality of the communication holes are provided, the amount is a multiple of Formula 1. Therefore, it is necessary to reduce the diameter of the communication hole when securing an appropriate amount of oil supply and providing a plurality of the communication holes.

  Therefore, it is desired that the change in the compressor efficiency due to the change in the rotational speed is small and that the amount of oil supplied to the compression chamber can be optimized.

  An object of the present invention is to provide a ring oil type scroll compressor capable of optimizing the amount of oil supplied to the compression chamber.

The object of the present invention is as follows.
In a scroll compressor comprising an orbiting scroll between a fixed scroll and a frame in an airtight container, and forming an intermediate pressure chamber for generating pressure to press the orbiting scroll against the fixed scroll by the frame and the orbiting scroll,
A flange portion disposed on an outer periphery of the bearing portion of the orbiting scroll;
A seal ring that is in contact with the flange portion and divides the intermediate pressure chamber into a high pressure chamber having a pressure substantially equal to the pressure in the sealed container and a low pressure chamber having a pressure for pressing the orbiting scroll against the fixed scroll;
Wherein with the revolution motion of the orbiting scroll via said seal ring, and a plurality arranged oil supply passage to said flange portion for communicating the low pressure chamber and intermittently the high pressure chamber,
A scroll compressor characterized in that a cross-sectional area of the plurality of oil supply passages communicating with the high-pressure chamber and the low-pressure chamber is constant regardless of the revolving motion of the orbiting scroll. > Achieved by

  Further, the orbiting scroll is supported by an Oldham ring and an Oldham key groove, and an opening axial direction of at least the Oldham key groove of the plurality of oil supply passages is substantially directed to the Oldham key groove of the orbiting scroll. good.

  The orbiting scroll may be supported by an Oldham ring and an Oldham key groove, and the number of oil supply passages may be equal to or greater than the number of sliding portions of the Oldham key.

  According to the present invention, it is possible to optimize the amount of oil supplied to the compression chamber.

  Examples of the present invention will be described below with reference to FIGS.

  FIG. 1 is a sectional view of a ring oil type scroll compressor according to the present invention. The cycle oil type scroll compressor includes a sealed container 1, a fixed scroll 2 having a spiral wrap provided inside the sealed container 1, and a plurality of compression chambers 3 engaged with the wrap of the fixed scroll 2. The orbiting scroll 4 having a lap that forms a circle, the Oldham ring 5 for suppressing the revolving motion of the orbiting scroll 4 and allowing the revolving motion, the orbiting scroll 4 and the Oldham ring 5 are accommodated and the fixed scroll 2 is accommodated. A compression mechanism portion 8 including a frame 7 that supports a plurality of bolts 6, an electric motor portion 11 including a stator 9 and a rotor 10, a refrigerating machine oil 12 provided in the sealed container, and the refrigerating machine oil 12. The forced oil pump 13 for supplying the compression mechanism 8 and the rotational force of the rotor 10 are transmitted to the compression mechanism 8 and the forced oil pump 13. Consisting crankshaft 14 to.

  The forced oil pump 13 is a positive displacement pump that is immersed in the refrigerating machine oil 12 accumulated in the lower part of the hermetic container 1 and discharges using the rotation of the crankshaft 14. For example, a trochoid pump is desirable. The sealed container 1 and the compression mechanism 8 are fixed by welding the outer periphery of the fixed scroll 2 to the frame 7 or the like. Refrigerant gas flows into the fixed scroll 2 from the suction pipe 20 in a low pressure state, enters a high pressure state in the compression chamber 3, and enters the sealed container 1 from the discharge port 2 a provided at the approximate center of the fixed scroll 2. To be discharged.

  The refrigerating machine oil 12 sealed in the hermetic container 1 passes through the oil supply passage 14a provided in the axial center portion of the crankshaft 14 when the forced oil pump 13 rotates, and in each bearing part and the frame 7 To the intermediate pressure chamber 7a. Here, the intermediate pressure chamber 7 a is divided into two chambers, a high pressure chamber 7 aa and a low pressure chamber 7 ab, by a flange portion 4 a provided on the outer peripheral portion of the bearing of the orbiting scroll 4 and a seal ring 15 provided on the frame 7. ing.

  A spring 16 is provided below the seal ring 15 to ensure close contact with the flange portion 4a. The flange portion 4a is provided with a through hole 4b serving as an oil supply path from the high pressure chamber 7aa to the low pressure chamber 7ab. The through hole 4b revolves around the orbiting scroll 4 so that the seal ring 15, the high-pressure chamber 7aa and the low-pressure chamber 7ab are moved back and forth. The high pressure chamber 7aa is provided with a waste oil pipe 17 communicating with the inside of the sealed container 1, and the flow of the refrigerating machine oil 12 from the high pressure chamber 7aa flows into the low pressure chamber 7ab from the through hole 4b, The waste oil pipe 17 is divided into one that is discharged into the sealed container 1. Here, since the refrigerating machine oil 12 flowing into the low pressure chamber 7ab from the through hole 4b flows into the compression chamber 3, the amount of oil supplied from the high pressure chamber 7aa to the low pressure chamber 7ab is, that is, the compression chamber. The amount of oil supply to 3.

  2 is an enlarged cross-sectional view of the inside of the intermediate pressure chamber 7a, and FIG. 3 is an external view of the anti-wrap surface of the orbiting scroll 4. As shown in FIG. The refrigerating machine oil 12 reaches the high-pressure chamber 7aa through the oil supply passage 14a by the forced oil supply pump 13. Since the high-pressure chamber 7aa is separated from the low-pressure chamber 7ab by the seal ring 15, the pressure in the high-pressure chamber 7aa is substantially the discharge pressure Pd, and the pressure in the low-pressure chamber 7ab is on the back surface of the orbiting scroll 4. The intermediate pressure Pb acts. Oil supply from the high pressure chamber 7aa to the low pressure chamber 7ab is performed by the through hole 4b provided in the orbiting scroll flange portion 4a. Here, among the through holes 4ba and 4bb provided at positions symmetrical with respect to the center of the revolving motion of the orbiting scroll 4, the through hole 4ba is located inside the seal ring 15, so that the high pressure chamber 7aa The low pressure chamber 7ab communicates with the oil supply passage, and the through hole 4bb is outside the seal ring 15 and is not an oil supply passage.

  The relationship between the through holes 4ba and 4bb is determined by the crank angle of the crankshaft 14, and the through hole 4bb becomes an oil supply passage when the stroke of 180 ° is advanced from FIG. As described above, when the plurality of through holes 4b are provided at positions symmetrical with respect to the center of the revolving motion of the orbiting scroll 4, the oil supply amount Q is assumed that the diameter of the plurality of through holes 4b is d and the length is L. There is a relationship of Formula 2. Here, μ is the viscosity coefficient of the refrigerating machine oil to be supplied, and n ′ is the number of the through holes 4b that communicate with the high pressure chamber 7aa and the low pressure chamber 7ab.

  The n ′ is substantially constant regardless of the crank angle of the orbiting scroll 4. That is, the lubrication amount Q can be optimized by the diameter d and length L of the through-hole 4b and the number n 'communicated. Of the plurality of through holes 4b, at least the one close to the key portion 5a (Oldham key groove) of the Oldham ring 5 is preferably oriented in the axial direction toward the key portion 5a of the Oldham ring 5. (In FIG. 2, it is along the axial direction and is not directed to the key portion 5a of the Oldham ring 5). As a result, the refrigerating machine oil 12 can be sprayed onto the sliding part of the Oldham key, and the reliability of the sliding part can be improved.

  In other words, the orbiting scroll 4 is supported by the Oldham ring and the Oldham key groove, and the opening axis direction of the oil supply passage (through hole 4b) is directed to the Oldham key groove of the orbiting scroll 4, so the reliability of the sliding portion Can be improved.

  Therefore, in order to improve the reliability of the sliding portion, it is desirable to provide at least two through holes 4b, and further to provide a through hole 4b that intermittently connects the high pressure chamber and the low pressure chamber.

  From the above, the amount of oil supplied to the compression chamber is determined by the differential pressure between the high-pressure chamber and the low-pressure chamber and the specifications of the through hole serving as the oil supply passage between the two chambers. That is, the amount of oil supplied from the high pressure chamber provided in the intermediate pressure chamber to the low pressure chamber is determined by the pressure difference between the high pressure chamber and the low pressure chamber without depending on the rotational speed of the compressor. Therefore, it is possible to suppress the change in the compressor efficiency accompanying the change in the rotational speed seen in the conventional machine.

  Further, by arranging the through hole at a position where the high pressure chamber and the low pressure chamber are moved back and forth through the seal ring, all the through holes are located inside the seal ring regardless of the revolution movement of the orbiting scroll of the conventional machine. When the diameters of the through holes are unified, the number can be increased as compared with the case where only the openings are always opened. Similarly, when the number of the through holes is unified, the diameter can be increased. Thereby, the diameter of the hole, the number, and the freedom degree of arrangement | positioning become high, and optimization of the amount of oil supply to a compression chamber can be aimed at. In other words, by providing a degree of freedom in diameter or number as compared with a conventional one that does not allow traffic, the amount of oil supplied to the compression chamber can be optimized, and fluctuations in the efficiency of the compressor due to changes in the rotational speed can be suppressed.

Further, as a specific configuration, a compression chamber is formed by meshing a fixed scroll and an orbiting scroll that erects a spiral wrap with a disc-shaped end plate, and the orbiting scroll is revolved without rotating, A compression step of absorbing a gas refrigerant from an inlet opening at an outer peripheral portion of the fixed scroll and discharging a compressed gas from an outlet opening at a substantially central portion of the fixed scroll; A forced oil pump for supplying oil to a rotary shaft having a crank portion for transmitting and eccentrically moving is provided, and the refrigerating machine oil supplied from the forced oil pump is a through hole provided in the shaft center portion of the rotary shaft. And then flows into the intermediate pressure chamber containing the Oldham ring that suppresses the rotation of the orbiting scroll and the orbiting scroll. In the ring oil type scroll compressor having a waste oil path for returning into the compressor casing a portion of said refrigerating machine oil having flowed into the intermediate pressure chamber just prior to refueling into the compression chamber,
A flange portion is provided on the outer periphery of the orbiting scroll bearing portion, and a seal ring in contact with the flange portion is provided in the intermediate pressure chamber to form a high pressure chamber and a low pressure chamber, and the flange portion extends from the high pressure chamber to the low pressure chamber. A scroll compressor provided with a communicating oil passage is obtained.

Sectional drawing of a ring-oil type scroll compressor. The expanded sectional view in the intermediate pressure chamber of a ring oil type scroll compressor. The external view which looked at the turning scroll of a ring-oil type scroll compressor from the anti-wrap surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Fixed scroll 2a Discharge port 3 provided in fixed scroll 3 Compression chamber 4 Orbiting scroll 4a Flange part 4b, 4ba, 4bb provided in the bearing outer periphery of orbiting scroll 5 Through-hole 5 provided in orbiting scroll flange part Oldham Ring 5a Oldham key portion 6 Bolt 7 Frame 7a Intermediate pressure chamber 7aa High pressure chamber 7ab in the intermediate pressure chamber Low pressure chamber 8 in the intermediate pressure chamber 8 Compression mechanism portion 9 Stator 10 Rotor 11 Motor portion 12 Refrigerating machine oil 13 Forced oil pump 14 Crankshaft 14a Flow path 15 provided at the center of the crankshaft 15 Seal ring 16 Spring 17 Waste oil pipe 20 Suction pipe

Claims (3)

In a scroll compressor comprising an orbiting scroll between a fixed scroll and a frame in an airtight container, and forming an intermediate pressure chamber for generating pressure to press the orbiting scroll against the fixed scroll by the frame and the orbiting scroll,
A flange portion disposed on an outer periphery of the bearing portion of the orbiting scroll;
A seal ring that is in contact with the flange portion and divides the intermediate pressure chamber into a high pressure chamber having a pressure substantially equal to the pressure in the sealed container and a low pressure chamber having a pressure for pressing the orbiting scroll against the fixed scroll;
Wherein with the revolution motion of the orbiting scroll via said seal ring, and a plurality arranged oil supply passage to said flange portion for communicating the low pressure chamber and intermittently the high pressure chamber,
A scroll compressor characterized in that a cross-sectional area of the plurality of oil supply passages communicating with the high-pressure chamber and the low-pressure chamber is constant regardless of the revolving motion of the orbiting scroll. In claim 1,
The orbiting scroll is supported by Oldham ring and Oldham keyway,
A scroll compressor characterized in that an opening axial direction of at least one of the plurality of oil supply passages provided in the vicinity of the Oldham key groove is substantially directed to the Oldham key groove of the orbiting scroll. In claim 1,
The orbiting scroll is supported by Oldham ring and Oldham keyway,
The scroll compressor according to claim 1, wherein the number of the oil supply passages is equal to or greater than the number of sliding portions of the Oldham key.

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