KR101015016B1 - Scroll compressor - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide an annular scroll compressor capable of minimizing fluctuations in compressor efficiency due to a change in rotational speed and optimizing oil supply to a compression chamber.

The flange part is provided in the bearing of the swinging scroll accommodated in the intermediate | middle pressure chamber, The seal ring which becomes a partition which divides the said intermediate | middle pressure chamber into two chambers of a high pressure chamber and a low pressure chamber is provided, and the said flange is connected to the low pressure chamber from the high pressure chamber. A plurality of through holes serving as an oil supply passage are formed. The through hole is disposed at a position where the high pressure chamber and the low pressure chamber divided by the seal ring can travel between the high pressure chamber and the low pressure chamber by the orbiting motion of the revolving scroll, and the cross section communicating the high pressure chamber with the low pressure chamber is the turning scroll. Regardless of the position, the specification becomes constant.

Swivel Scroll, High Pressure Room, Low Pressure Room, Static Movement, Through Hole

Description

Scroll Compressor {SCROLL COMPRESSOR}

The present invention relates to a rotary hermetic scroll compressor having a forced oil supply pump by compressing refrigerant gas such as a refrigeration air conditioning system.

A refueling type for lubricating the refrigeration oil enclosed inside the compressor to each bearing part by a forced oil pump, and then immediately discharging a part of the refrigeration oil into the case immediately before refueling into the compression chamber formed by the fixed scroll and the turning scroll. In a conventional scroll compressor, partition walls, such as a seal ring, which divides the intermediate pressure chamber containing the swing scroll and the Oldham ring into two chambers, are provided. In addition, it is necessary to form a high pressure chamber for storing the refrigeration oil immediately before lubricating the compression chamber by this partition wall, and a low pressure chamber having a pressure sufficient to press the fixed scroll on the back of the swing scroll. It is necessary to install the oil supply mechanism to the low pressure chamber.

With respect to this problem, Patent Document 1 discloses a plurality of holes or grooves which can travel between a high pressure chamber and a low pressure chamber divided through a seal ring, and which do not communicate with the high pressure chamber and the low pressure chamber. A mechanism for lubricating the high pressure chamber from the high pressure chamber to the low pressure chamber by holding oil is taken.

In addition, in the patent document 2, in the patent document 2, a flange part is provided in the outer periphery of a turning scroll bearing part, the seal ring which contact | connects the said flange part is formed, and a high pressure chamber and a low pressure chamber are formed, and the said high pressure chamber and the said low pressure chamber were formed in the said flange part. A mechanism is provided in which a plurality of through holes serving as communicating oil passages are formed, and all of the plurality of through holes are always in communication with the high pressure chamber and the low pressure chamber to be opened to supply oil.

<Patent Document 1> Japanese Patent Application Laid-Open No. 9-228968

Patent Document 2: Japanese Unexamined Patent Application Publication No. 2005-248772

In Patent Literature 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 number of revolutions of the motor and the specifications and the number of the holes, but it is a small amount at low rotation and a large amount at high rotation. There is this.

In Patent Literature 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 depends on the specification and the number of the communication holes used as the differential pressure and the oil supply passage of the high pressure chamber and the low pressure chamber. Not affected The oil supply amount by the specification of the said communication hole is determined by Formula (1), and when forming a plurality of said communication holes, it becomes multiple times of the said Formula (1). For this reason, it is necessary to ensure the oil supply amount which becomes a suitable quantity, and when the plurality of said communication holes are formed, the diameter of a communication hole needs to be made small.

[Equation 1]

Therefore, it is expected that the fluctuation in the compressor efficiency due to the change in the rotational speed becomes small and the oil supply to the compression chamber can be optimized.

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

The object of the present invention,

A scroll compressor provided with a swing scroll between a fixed scroll and a frame in a sealed container, and having an intermediate pressure chamber for generating a pressure for pressing said swing scroll against said fixed scroll by said frame and said swing scroll.

A flange portion disposed on an outer circumference of the bearing portion of the swing scroll;

A seal ring for dividing the intermediate pressure chamber into a high pressure chamber at a pressure substantially equal to the pressure in the hermetic container and a low pressure chamber at a pressure for pressing the swing scroll against the fixed scroll;

A plurality of oil supply passages for intermittently communicating between the high pressure chamber and the low pressure chamber via the seal ring are disposed in the flange portion in accordance with the orbital motion of the swing scroll.
A cross section of the communication between the high pressure chamber and the low pressure chamber among the plurality of oil supply passages is achieved by a scroll compressor, which is constant regardless of the position due to the orbiting motion of the swing scroll.

The swing scroll is supported by an Oldham ring and an Oldham key groove, and an opening axis direction of at least one of the plurality of oil supply passages provided near the Oldham key groove may be directed toward the Oldham key groove of the swing scroll.

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

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According to the present invention, it is possible to optimize the oil supply amount into the compression chamber.

1 to 3, an embodiment of the present invention will be described.

1 is a cross-sectional view of a circular oil scroll compressor according to the present invention. The annular scroll compressor is provided in the hermetically sealed container 1, inside the hermetically sealed container 1, and has a fixed scroll 2 having a spiral wrap and a plurality of wraps of the fixed scroll 2. A swinging scroll (4) having a lap forming a compression chamber (3), an oldham ring (5) for suppressing the rotational movement of the swinging scroll (4) and allowing an orbital movement; Compression mechanism part 8 comprising the frame 7 for receiving the Oldham ring 5 and supporting the fixed scroll 2 with a plurality of bolts 6, the stator 9 and the rotor 10. A forced oil supply pump 13 and the rotor 10 for supplying the electric motor unit 11, the refrigeration oil 12 provided in the sealed container, and the refrigeration oil 12 to the compression mechanism 8; Crankshaft (14) for transmitting the rotational force of the compression mechanism (8) and the forced oil supply pump (13) .

The forced oil feed pump 13 is a volumetric pump that is immersed in the refrigerator oil 12 stored in the lower part of the sealed container 1 and discharged by using the rotation of the crankshaft 14. Tropicoid pumps are preferred. The said airtight container 1 and the compression mechanism part 8 are fixed by welding the outer periphery of the said fixed scroll 2-the frame 7, or. The refrigerant gas flows into the fixed scroll 2 from the suction pipe 20 in a state of low pressure and becomes a high pressure state in the compression chamber 3, from a discharge port 2a provided at an approximately center of the fixed scroll 2. It is discharged into the sealed container 1.

The refrigeration oil 12 enclosed in the sealed container 1 is rotated by the forced oil feed pump 13 through the oil supply passage 14a provided at the shaft center portion of the crankshaft 14 so that each bearing portion and the frame ( Lubrication is supplied to the intermediate pressure chamber 7a in 7). Here, the intermediate pressure chamber 7a is formed of a high pressure chamber 7aa and a low pressure chamber by a flange portion 4a provided on the bearing outer peripheral portion of the swing scroll 4 and a seal ring 15 provided on the frame 7. It is divided into two rooms of (7ab).

In addition, a lower portion of the seal ring 15 is provided with a spring 16 for ensuring close contact with the flange portion 4a. The flange portion 4a is provided with a through hole 4b which serves as an oil supply path from the high pressure chamber 7aa to the low pressure chamber 7ab, and the turning hole 4 is revolved in the through hole 4b. By moving, the high pressure chamber 7aa and the low pressure chamber 7ab pass through the seal ring 15. In the high pressure chamber 7aa, a waste oil pipe 17 communicating with the sealed container 1 is provided, and the flow of the refrigeration oil 12 from the high pressure chamber 7aa flows from the through hole 4b. It flows into the low pressure chamber 7ab, and discharges into the said airtight container 1 from the said waste oil pipe 17. As shown in FIG. Here, since the refrigeration oil 12 introduced into the low pressure chamber 7ab from the through hole 4b is introduced into the compression chamber 3, the high pressure chamber 7aa from the high pressure chamber 7aa to the low pressure chamber 7ab. The oil supply amount, that is, the oil supply amount into the compression chamber 3 is obtained.

FIG. 2 is an enlarged sectional view of the inside of the intermediate pressure chamber 7a, and FIG. 3 is an external view of the lap surface opposite to the swing scroll 4. The refrigerator 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 isolated from the low pressure chamber 7ab by the seal ring 15, the pressure in the high pressure chamber 7aa becomes a roughly discharge pressure Pd, and the low pressure chamber 7ab The internal pressure becomes an intermediate pressure Pb acting on the rear surface of the swing scroll 4. Lubrication from the high pressure chamber 7aa to the low pressure chamber 7ab is performed by the through hole 4b provided in the swing scroll flange portion 4a. The through-hole 4ba of the through-holes 4ba and 4bb provided at symmetrical positions with respect to the center of the orbiting motion of the swinging scroll 4 is the inner side of the seal ring 15 because the through-hole 4ba becomes the inside of the seal ring 15. The seal 7aa and the low pressure chamber 7ab communicate with each other to form an oil supply passage, and the through hole 4bb becomes an outer side of the seal ring 15 to become 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 180 ° stroke is advanced from FIG. The oil supply amount Q when the plurality of through holes 4b is formed at a position symmetrical to the center of the orbiting motion of the swing scroll 4 is d, the length of the plurality of through holes 4b, and length. If L is, there is a relation of equation (2). Is the viscosity coefficient of the refrigeration oil to be refueled, and n 'represents the number of the communication between the high pressure chamber 7aa and the low pressure chamber 7ab in the through hole 4b.

[Equation 2]

The n 'is made to be substantially constant irrespective of the crank angle of the turning scroll 4. That is, the oil supply amount Q can be optimized by the diameter d, the length L, and the number n 'of communication of the through hole 4b. In addition, it is preferable that the axial direction of the plurality of through holes 4b close to the key portion 5a (oldham key groove) of the Oldham ring 5 is directed toward the key portion 5a of the Oldham ring 5. (It is along the axial direction in FIG. 2, and does not face the key part 5a of the Oldham ring 5). This makes it possible to inject the refrigerator oil 12 into the sliding portion of the Oldham key, thereby improving the reliability of the sliding portion.

In other words, the swing scroll 4 is supported by the Oldham ring and the Oldham key groove, and the sliding axis 4 is slid because the opening axis direction of the oil supply passage (through hole 4b) is directed toward the Oldham key groove of the rough swing scroll 4. Negative reliability can be improved.

Therefore, in order to improve the reliability of the sliding part, at least two through holes 4b are preferably arranged, and it is preferable to form through holes 4b for intermittently communicating with the high pressure chamber and the low pressure chamber.

From the above, the amount of oil supply to the compression chamber is determined by the pressure difference between the high pressure chamber and the low pressure chamber and the specification of the through hole serving as the oil supply path between the two chambers. That is, the oil supply amount from the high pressure chamber installed 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, regardless of the number of revolutions of the compressor. Therefore, the fluctuation of the compressor efficiency accompanying the change of the rotation speed seen with the conventional compressor can be suppressed.

Further, by arranging the through hole at a position where the high pressure chamber and the low pressure chamber come and go through the seal ring, all the through holes are arranged only inside the seal ring and are always opened regardless of the orbiting motion of the swing scroll of the conventional compressor. In comparison with the above case, a large number can be set when the diameter of the through hole is unified. Similarly, when the number of the through holes is unified, the diameter can be increased. As a result, the diameter, the number, and the degree of freedom of arrangement of the holes are increased, and the amount of oil supply to the compression chamber can be optimized. In other words, by providing a degree of freedom in the diameter to the number compared with the conventional one, it is possible to optimize the amount of oil supply to the compression chamber and to suppress fluctuations in the efficiency of the compressor due to the change in rotational speed.

As a specific configuration, the compression chamber is formed by engaging the fixed scroll and the revolving scroll which erect the spiral wrap on the disc-shaped end plate, and the revolving motion is opened to the outer circumference of the fixed scroll without rotating the revolving scroll. A compression process for absorbing gas refrigerant from the suction port, and discharging the compressed gas from the discharge port opened at the center of the fixed scroll, and having a crank portion for transmitting the rotational force of the electric motor to the swing scroll and for eccentric movement. A forced oil feed pump for lubricating is provided, and the refrigeration oil fed from the forced oil feed pump is lubricated through the through hole formed in the shaft center portion of the rotary shaft to the bearing portion of the rotary shaft, and then the rotating scroll and the rotating scroll rotate. Medium pressure which stored Oldham ring holding down In the inlet chamber, and a part of the refrigeration oil flowing in the pressure chamber the intermediate ring type scroll compressor having the waste oil in the case for returning into the compressor immediately before the fuel supply chamber the compression,

A flange portion is provided on an outer circumference of the swing 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 oil supply to communicate with the flange portion from the high pressure chamber to the low pressure chamber. A scroll compressor provided with a furnace is obtained.

1 is a cross-sectional view of an annular scroll compressor.

2 is an enlarged cross-sectional view in an intermediate pressure chamber of an annular scroll compressor.

Fig. 3 is an external view of the swing scroll of the annular scroll compressor seen from the opposite wrap surface;

<Explanation of symbols for the main parts of the drawings>

1: sealed container

2: fixed scroll

2a: discharge port installed in fixed scroll

3: compression chamber

4: turning scroll

4a: Flange part installed on the outer circumference of the bearing of the revolving scroll

4b, 4ba, 4bb: through holes installed in the swing scroll flange

5: Oldham Ring

5a: Oldham Key Boo

6: bolt

7: frame

7a: middle pressure chamber

7aa: high pressure chamber in the middle pressure chamber

7ab: low pressure chamber in middle pressure chamber

8 compression unit

9: stator

10: rotor

11: electric motor part

12: refrigerator oil

13: forced refueling pump

14: crankshaft

14a: Flow path installed at the shaft center of the crankshaft

15: seal ring

16: spring

17: waste oil pipe

20: suction pipe

Claims (4)

A scroll compressor comprising a swing scroll between a fixed scroll and a frame in an airtight container, and having an intermediate pressure chamber for generating a pressure for pressing the swing scroll against the fixed scroll by the frame and the swing scroll. A flange portion disposed on an outer circumference of the bearing portion of the swing scroll; A seal ring for dividing the intermediate pressure chamber into a high pressure chamber in contact with the flange portion and a low pressure chamber at a pressure for pressing the swing scroll against the fixed scroll, the pressure chamber being equal to the pressure in the sealed container; A plurality of oil supply passages for intermittently communicating between the high pressure chamber and the low pressure chamber via the seal ring are disposed in the flange portion in accordance with the orbital motion of the swing scroll. And a cross-sectional area of the communication between the high pressure chamber and the low pressure chamber among the plurality of oil supply passages is constant regardless of the position due to the orbiting motion of the swing scroll. 2. The pivoting scroll of claim 1 wherein the pivoting scroll is supported by an Oldham ring and an Oldham keyway, And an opening axis direction of at least one of the plurality of oil supply passages provided near the Oldham key groove is directed to the Oldham key groove of the swinging scroll or the vicinity thereof. The scroll compressor according to claim 1, wherein the turning scroll is supported by an Oldham ring and an Oldham key groove, and the number of the oil passages is equal to or greater than the number of sliding portions of the Oldham key. delete

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