JP2005214173A - Sealed scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor capable of minimizing rotating vibration. <P>SOLUTION: The sealed scroll compressor comprises a sealed container, a compression mechanism part provided in the sealed container and having a fixed scroll, a rotary scroll and their supporting frame, a motor part provided in the sealed container and having a rotor at the center and a stator therearound for rotating the rotary scroll of the compression mechanism part, a crank shaft fixed at one of its upper and lower portions to the rotor so as to be driven by the motor part for revolving the rotary scroll at the shaft end of the other portion, and a discharge flow path for guiding refrigerant gas discharged from the compression mechanism part to the outside of the sealed container. It has a centrifugal oil separating member arranged at least one place in the discharge flow path so as to be rotated integrally with the crank shaft or the rotor and a balance weight arranged on the centrifugal oil separating member for balancing the rotating motion of the crank shaft. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a scroll compressor.

The scroll compressor is provided inside the hermetic container, and is provided in the hermetic container with a fixed scroll, a orbiting scroll, and a frame that supports them. An electric motor unit for rotating the orbiting scroll of the compression mechanism unit, a crankshaft driven by the electric motor unit and revolving the orbiting scroll at the shaft end, and the crankshaft By orbiting (revolving) the orbiting scroll with respect to the fixed scroll, the gas is compressed.
Such a scroll compressor has an orbiting scroll revolving orbit, an eccentric part provided on the crankshaft, a static or dynamic unbalance inherent in the motor part, etc. There is a problem that it occurs in the crankshaft.
Therefore, in a conventional scroll compressor, a balance weight for balancing the rotational movement of the crankshaft is provided in a portion of the crankshaft in the intermediate pressure chamber provided between the orbiting scroll and the frame. Rotational vibration is suppressed.

However, the intermediate pressure chamber cannot be sufficiently wide due to structural problems, and therefore there is a great limitation on the design of the balance weight, which can sufficiently suppress the rotational vibration of the scroll compressor. could not.
Then, the subject of this invention is providing the scroll compressor which can suppress a rotational vibration as much as possible.

By the way, in such a scroll compressor, for example, lubricating oil is supplied to the sliding portion of the orbiting scroll and the fixed scroll by a differential pressure oil supply method. Dispersed in a certain gas (hereinafter referred to as a refrigerant gas) and discharged as it is to the outside of the compressor, causing various problems in equipment using the refrigerant gas.
Therefore, in Japanese Patent Application Laid-Open No. 7-174086, a dish-like centrifugal oil separating member is fixed to a crankshaft in a part of a discharge flow path of a compressed compressor refrigerant gas of a scroll compressor, and lubrication from the refrigerant gas is performed by the centrifugal force. Techniques for separating oil have been proposed.
Japanese Patent Laid-Open No. 7-174086

This invention is comprised using the said centrifugal oil separation member, Comprising: It has the structure of following (1)-(6).
(1)
Sealed container,
A compression mechanism having a fixed scroll, an orbiting scroll, and a frame for supporting them, provided inside the sealed container;
An electric motor unit that is provided in the sealed container and includes a central rotor and a stator disposed around the rotor, and rotates an orbiting scroll of the compression mechanism unit;
The rotor is fixed in one of the upper part and the lower part and driven by the electric motor unit, and the other part shaft end revolves the orbiting scroll,
In the hermetic scroll compressor having a discharge flow path for guiding the refrigerant gas discharged from the compression mechanism part to the outside of the hermetic container,
A centrifugal oil separating member that is arranged at least in one place of the discharge flow path and rotates integrally with the shaft or the rotor, and a balance that is arranged on the centrifugal oil separating member and balances the rotational movement of the shaft. A hermetic scroll compressor comprising a weight.
(2)
The compression mechanism is provided in the upper part of the sealed container, the electric motor part is provided in the lower part of the sealed container, and constitutes a part of the discharge flow path between the lower surface of the frame and the rotor. A flow-path portion is formed, a ring-shaped centrifugal oil separation member having a height in the length direction of the shaft is disposed in the flow passage portion, and the refrigerant gas subjected to oil separation treatment by the centrifugal oil separation member The closed scroll compressor according to (1), wherein the gas introduction opening of the final flow path for discharging the gas to the outside of the sealed container is disposed inside the ring shape of the centrifugal oil separating member.
(3)
The hermetic scroll compressor according to (2), wherein the final flow path is provided in the frame.
(4)
A part of the discharge flow path is formed by a single vertical groove provided at the periphery of the frame, and the gas introduction opening is disposed on the opposite side of the vertical groove with the axis as the center. The hermetic scroll compressor according to the above (2) or (3).
(5)
The centrifugal scroll separation member according to any one of (1) to (4), wherein the centrifugal oil separation member has a shape with a missing ring.
(6)
The hermetic scroll compressor according to any one of (1) to (5), wherein the balance weight is formed in the form of a flange extending outward in a substantially horizontal direction from the centrifugal oil separating member.

In the hermetic scroll compressor of the present invention, since the balance weight is arranged outside the compression mechanism, the degree of freedom in design is increased, good balance correction can be performed, and rotational vibration can be greatly suppressed.
Further, in the conventional scroll compressor, since the balance weight is arranged in the compression mechanism portion filled with the lubricating oil, it becomes rotational resistance and hinders the rotation efficiency, but in the scroll compressor of the present invention, The balance weight in the compression mechanism can be reduced or eliminated in some cases, and the above problem does not occur. Therefore, it leads to further miniaturization of the machine.

By the way, Japanese Patent Application Laid-Open No. 2002-317775 discloses one in which a balance weight is attached to the rotor of the compression mechanism portion, that is, the motor portion. However, since the adjustment of the rotation balance is performed by changing the weight of the balance weight or the position of the center of gravity thereof, the one described in the above publication cannot be made larger than the rotor diameter (when it is increased, it hits the stator) and the balance is adjusted The only way to do this is to change the weight without changing the center of gravity. In order to change the weight, it is necessary to change the material or to increase the height of the weight as it is.
On the other hand, in the case of the present invention, the oil separation member may be integrally attached to the rotor, but the balance weight is formed in the flange shape, for example, so that the flange is not limited to the rotor diameter. The position of the center of gravity of the balance weight can be changed by adjusting the horizontal length of the portion, and there is an extremely high degree of freedom. Therefore, there is a remarkable advantage that accurate balance adjustment can be performed.

That is, the present invention
(1) When adjusting the balance, the balance weight can be adjusted by changing the position of the center of gravity without increasing the weight of the balance weight, so the rotation efficiency is not hindered. (2) It is not necessary to increase the height of the balance weight. (3) Without changing the other shape, just adjust the horizontal length of the flange,
There is an effect that balance correction can be easily and accurately performed.

Hereinafter, a scroll compressor according to an embodiment of the present invention will be described with reference to the accompanying drawings.
The scroll compressor according to the embodiment of the present invention includes a sealed container 1 as shown in FIG. 1, and this sealed container 1 includes a cylindrical case 1a and upper and lower sides of the cylindrical case 1a. Are respectively press-fitted and welded with a lid chamber 1b and a saw chamber 1c. A compression mechanism section 2 and an electric motor section 10 for operating the compression mechanism section 2 are disposed in the sealed container 1. In the figure, the compression mechanism unit 2 is shown on the upper side and the motor unit 10 is shown on the lower side. However, what is the arrangement relationship between the compression mechanism unit 2 and the motor unit 10 such as up and down? There may be. Further, it may be a horizontal type or an oblique type. Lubricating oil 15 is sealed at the bottom of the sealed container 1.

The compression mechanism section 2 includes a frame 3, a turning scroll 5 housed in a step 3b of the frame, and a fixed scroll 7 disposed on the turning scroll. Spiral wraps 5b and 7b are respectively provided on opposing surfaces (that is, surfaces on the sliding surface side) of the end plates 5a and 7a of the orbiting scroll 5 and the fixed scroll 7, and these wraps mesh with each other. Thus, the compression chamber 8 is configured.
A crankshaft 4 that transmits the rotational force of the electric motor 10 and revolves the orbiting scroll 5 at its eccentric portion 4a is rotatably supported on the main shaft portion 4b of the main shaft portion 4b. Due to this revolution, the boss portion inner diameter 5c of the orbiting scroll 5 into which the eccentric portion 4a of the crankshaft 4 is fitted has a shape corresponding to the eccentric portion 4a. Further, an Oldham ring 6 for preventing rotation of the orbiting scroll 5 is inserted and supported in a keyway (not shown) of the frame 3. The key 6 a of the Oldham ring 6 is fitted in the key groove 5 d of the orbiting scroll 5.

The electric motor unit 10 includes a rotor 10a and a stator 10b disposed around the rotor 10a. The rotor 10a is joined to the lower portion of the main shaft portion 4b of the crankshaft 4 protruding downward from the main bearing 3a of the frame 3 by press fitting or the like. The outer diameter portion of the stator 10b of the electric motor 10 is joined to the inner diameter of the case 1a forming the sealed container 1 by shrink fitting or the like. The stator 10b and the rotor 10a are arranged concentrically, and an accurate gap is formed by a gap gauge (not shown) between the inner diameter of the stator 10b and the outer diameter of the rotor 10a. ing.
Further, the crankshaft 4 is rotatably supported by the auxiliary bearing 13 at the auxiliary shaft portion 4c protruding downward from the electric motor portion. The secondary bearing 13 is supported by a secondary bearing support 14 joined to the inner diameter of the case 1a of the closed container 1.

  As shown in the drawing, a suction hook pipe 1d is provided through the lid chamber 1b, and the suction pipe 11 is fitted and fixed to the suction hook pipe 1d. The lower end of the suction pipe 11 extends downward through the end plate 7a of the fixed scroll 7, communicates with the compression chamber 8, and introduces the circulated refrigerant gas into the compression chamber (represented by a thick black arrow). ). On the other hand, as shown in the figure, a discharge hook pipe 1f is provided through the case 1a, and a discharge pipe 12 is fitted and fixed to the hook pipe 1f.

  In addition, the hermetic scroll compressor is provided with a discharge flow path 20 that guides the refrigerant gas discharged from the compression mechanism section to the outside of the hermetic container 1 (indicated by a white arrow). In the discharge flow path 20, the high-pressure discharge gas discharged from the compression chamber 8 is discharged from the discharge hole 7 c of the fixed scroll 7 to the space 1 e above the sealed container 1 as indicated by the white arrow, and the fixed scroll 7. And passes through notches 7d and 3c formed in a part of the outer diameter of the frame 3, and passes through a part of the discharge flow path formed between the lower end surface 3f of the frame 3 and the upper end surface 10c of the motor unit, Finally, it returns to the refrigeration cycle (not shown) connected to the suction pipe 11 and the discharge pipe 12 through the final flow path 3e and the discharge pipe 12 communicated with the discharge pipe 12. In this example, the final flow path 3e is formed in the frame 3 as shown.

  This scroll compressor also employs a differential pressure oiling system, and in order to seal the compression chamber 8 and lubricate each sliding portion, the compression chamber 8 provided in the orbiting scroll 5 is similar to the conventionally known scroll compressor. The intermediate pressure hole 5e leading to the intermediate pressure point forms an intermediate pressure chamber 2a at the lower surface of the orbiting scroll 5 and the digging portion of the frame 3, and this intermediate pressure is loaded onto the orbiting scroll 5 and pressed against the fixed scroll 7. In addition, an oil film is formed between the end plate 5a of the orbiting scroll 5 and the end surface 7e of the fixed scroll 7, and the discharge pressure is applied to the lubricating oil 15 sealed in the bottom of the hermetic container 1 to Lubricating oil is supplied to each sliding portion through an oil hole 4d provided in the portion. The lubricating oil 15 intermittently flows into the compression chamber 8 from the intermediate pressure hole 5e and into the compression chamber 8 from between the end plate 5a of the orbiting scroll 5 and the end surface 7e of the fixed scroll 7, and becomes a mist-like discharge gas. Has the disadvantage of being mixed in.

  Accordingly, the hermetic scroll compressor is provided with a centrifugal oil separating member 16 in a part of the discharge flow path formed between the lower end surface 3f of the frame 3 and the upper end surface 10c of the electric motor section (particularly the rotor). ing. In the figure, the frame 3 is designed in such a shape that its lower end surface 3f is close to the centrifugal oil separating member 16 when the scroll compressor is assembled as a device. In this example, the centrifugal oil separation member 16 is provided in a part of the part.

  The centrifugal oil separating member 16 can have a shape as shown in FIG. 2, for example. The centrifugal oil separating member 16 shown in FIG. 2 includes an annular mounting portion 16a having a mounting hole 16b, and a ring-shaped centrifugal oil separating member main body 16c formed by being raised from the periphery thereof. The centrifugal oil separating member 16 is fixed to the rotor 10a of the electric motor by a rivet 17 or the like using the mounting hole 16b.

  The gas introduction opening 3d of the final flow path 3e of the discharge flow path 20 is formed so as to be located inside the ring of the centrifugal oil separation member main body 16c. As a result, the discharge gas is subjected to the action of the centrifugal oil separating member 16, and only the refrigerant gas from which the oil has been separated is discharged to the outside of the sealed container 1. The opening 3d is preferably provided on the opposite side of the groove 3e from the crankshaft as the center. As a result, the length of the discharge flow path is increased, thereby increasing the tendency of the oil to detach from the refrigerant gas. In this sense, a gap between the notch and the case formed in a part of the outer diameter of the stator of the motor unit and a case, and a gap and rotation between the rotor and the stator of the motor unit are formed in a part of the discharge flow path. It is desirable that the gap is formed between the child and the crankshaft, and the discharge flow path is made longer.

In the hermetic scroll compressor, the centrifugal oil separating member main body is provided with a balance weight for balancing the rotational movement of the crankshaft. In the example shown in FIG. 2, the balance weight 16 e is formed as a semi-annular flange that is provided integrally with the half of the centrifugal oil separating member main body 16 c and extends in the horizontal direction. Although the figure shows a semi-circular ring, it may be fan-shaped. In the example shown in FIG. 3, the balance weight 16e is configured by providing a notch 16d in an annular flange. As shown in FIG. 4, the centrifugal oil separating member main body 16c itself may be formed in a semi-ring shape.
Further, in this scroll compressor, the centrifugal oil separating member 16 may be attached to the crankshaft 4 as shown in FIG. Particularly in this case, the centrifugal oil separation member main body 16c of the centrifugal oil separation member 16 may be a simple annular plate member shown in FIG. Further, as shown in FIG. 7, it can be a rising portion (16c). At this time, the balance weight 16e can be provided on the lower surface of the plate-like member by bonding or the like as the land-like member shown in FIGS.

In the hermetic scroll compressor of the present invention, as described above, the balance weight is arranged outside the compression mechanism, so that the degree of freedom in design is increased, good balance correction can be performed, and rotational vibration is greatly suppressed. Can do.
Further, in the conventional scroll compressor, as indicated by reference numeral 4f in FIG. 1, since the balance weight is arranged in the compression mechanism portion filled with the lubricating oil, it becomes rotational resistance and hinders the rotation efficiency. However, in the scroll compressor of the present invention, the balance weight in the compression mechanism section can be reduced or eliminated in some cases, and the above problems do not occur. Therefore, it leads to further miniaturization of the machine.

It is a longitudinal section showing an example of a hermetic scroll compressor concerning the present invention. It is a perspective view which shows an example of the shape of the centrifugal oil separation apparatus member used for the sealed scroll compressor which concerns on this invention. It is a perspective view which shows an example of the other shape of the centrifugal oil separation apparatus member used for the sealed scroll compressor which concerns on invention. It is a perspective view which shows an example of the other shape of the centrifugal oil separation apparatus member used for the sealed scroll compressor which concerns on invention. It is a longitudinal cross-sectional view which shows the other example of the hermetic scroll compressor which concerns on this invention. It is a perspective view which shows an example of the shape of the centrifugal oil separation apparatus member used for the sealed scroll compressor which concerns on this invention. It is a perspective view which shows an example of the other shape of the centrifugal oil separation apparatus member used for the sealed scroll compressor which concerns on invention.

Explanation of symbols

1 airtight container,
1a case,
1b lid chamber,
1c Soko chamber,
1d Suction pipe,
1e The space above the sealed container,
1f discharge hook pipe,
2 compression mechanism,
2a Intermediate pressure chamber,
3 frames,
3a Main bearing,
3b step,
3c Notch,
3d discharge gas communication hole,
3e Discharge pipe press-fitting hole,
3f Lower end surface discharge gas communication hole opening end surface,
4 crankshaft,
4a Eccentric part,
4b spindle part,
4c countershaft part, 4d oil hole,
4e flange, 4f ... balance weight,
5 Orbiting scroll,
5a end plate,
5b wrap,
5c Boss inner diameter,
5d keyway,
5e Intermediate pressure hole,
6 Oldham Ring,
6a key,
7 Fixed scroll,
7a end plate,
7b wrap,
7c Discharge hole,
7d Notch,
7e end face,
8 compression chambers, 9 bolts,
10 Electric motor part,
10a rotor,
10b stator,
10c The upper end surface of the motor part,
11 Suction pipe,
12 Discharge pipe,
13 Sub-bearing,
14 Sub bearing support,
15 lubricant,
16 Centrifugal oil separator,
16a mounting part,
16b mounting hole,
16c Centrifugal oil separating member body,
16d cutout,
16e balance weight,
17 Rivet,
20 Discharge flow path

Claims (6)

Sealed container,
A compression mechanism having a fixed scroll, an orbiting scroll, and a frame for supporting them, provided inside the sealed container;
An electric motor unit that is provided in the sealed container and includes a central rotor and a stator disposed around the rotor, and rotates an orbiting scroll of the compression mechanism unit;
The rotor is fixed in one of the upper part and the lower part and driven by the electric motor unit, and the other part shaft end revolves the orbiting scroll,
In the hermetic scroll compressor having a discharge flow path for guiding the refrigerant gas discharged from the compression mechanism part to the outside of the hermetic container,
A centrifugal oil separating member that is arranged at least in one place of the discharge flow path and rotates integrally with the shaft or the rotor, and a balance that is arranged on the centrifugal oil separating member and balances the rotational movement of the shaft. A hermetic scroll compressor comprising a weight.   The compression mechanism is provided in the upper part of the sealed container, the electric motor part is provided in the lower part of the sealed container, and constitutes a part of the discharge flow path between the lower surface of the frame and the rotor. A flow-path portion is formed, a ring-shaped centrifugal oil separation member having a height in the length direction of the shaft is disposed in the flow passage portion, and the refrigerant gas subjected to oil separation treatment by the centrifugal oil separation member The hermetic scroll compressor according to claim 1, wherein the gas introduction opening of the final flow path for discharging the gas to the outside of the hermetic container is arranged inside the ring shape of the centrifugal oil separating member.   The hermetic scroll compressor according to claim 2, wherein the final flow path is provided in the frame.   A part of the discharge flow path is formed by a single vertical groove provided at the periphery of the frame, and the gas introduction opening is disposed on the opposite side of the vertical groove with the axis as the center. The hermetic scroll compressor according to claim 2 or 3.   The hermetic scroll compressor according to any one of claims 1 to 4, wherein the centrifugal oil separating member has a shape with a missing ring.   6. The hermetic scroll compressor according to claim 1, wherein the balance weight is formed in the form of a flange extending substantially outward in the horizontal direction from the centrifugal oil separating member.

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