JP2009162102A - Hermetic scroll compressor - Google Patents

Abstract

In a scroll compressor, it is possible to shift to high-efficiency operation early when starting.
A compression mechanism section 20 of a scroll compressor 50 includes a fixed scroll 6, a turning scroll 7, and a back pressure chamber 18 provided on the back side of the turning scroll 7 and having an intermediate pressure between suction pressure and discharge pressure. With. The orbiting scroll 7 has pores 14 penetrating from the back pressure chamber 18 to the tooth tip surfaces of the orbiting scroll base plate 7a and the orbiting scroll wrap 7b. The crankshaft 4 includes an oil supply path for supplying the lubricating oil 21 stored at the bottom of the sealed container 1 to the back pressure chamber 18 by a differential pressure. The compression mechanism unit 20 forms an asymmetric compression chamber in which compression of the turning outer line side compression chamber 19a of the orbiting scroll wrap 7b is started prior to the turning inner line side compression chamber 19b of the orbiting scroll wrap 7b. A groove 15 is formed on the tooth tip surface of the orbiting scroll wrap 7b to conduct the pore 14 only to the orbiting outer line side compression chamber 19a.
[Selection] Figure 1

Description

  The present invention relates to a hermetic scroll compressor, and is particularly suitable for a hermetic scroll compressor mounted on a refrigeration air conditioning system or heat pump water heater using carbon dioxide as a working refrigerant.

  A scroll compressor generally constitutes a compression chamber by meshing laps of a fixed scroll and a turning scroll. When the internal pressure of the compression chamber rises in the compression process, a force that separates the fixed scroll and the orbiting scroll is generated. The scroll is fixed to the scroll with a load that reduces the friction loss and leakage loss between the compression chambers while keeping the back pressure chamber of the orbiting scroll at an intermediate pressure between the suction pressure and the discharge pressure so that the force is greater than the separation force. It is carried out by pushing against.

  A conventional scroll compressor of this type is disclosed in Japanese Patent Application Laid-Open No. 2007-192189 (Patent Document 1).

  The scroll compressor of Patent Document 1 includes an electric motor unit, a compression mechanism unit that sucks a working fluid from the outside, compresses the compressed fluid, and discharges the compressed fluid into a space in a sealed container, and transmits the rotational force of the electric motor unit to the compression mechanism unit. And a crankshaft for driving the compression mechanism, a lubricating oil stored in the bottom of the sealed container, and the sealed container in which the electric motor section, the compression mechanism, and the crankshaft are housed. ing.

  The compression mechanism section forms a compression chamber by meshing with a fixed scroll having a fixed scroll wrap standing on a fixed scroll base plate and a stationary scroll lap standing on the orbiting scroll base plate. A orbiting scroll having an orbiting scroll wrap, a back pressure chamber provided on the back side of the orbiting scroll, which is an intermediate pressure between suction pressure and discharge pressure and presses the orbiting scroll against the fixed scroll side, and from the back pressure chamber A fine hole penetrating the orbiting scroll base plate and the orbiting scroll wrap, a groove communicating the fine hole and the compression chamber, and a back pressure adjusting valve for adjusting the back pressure chamber to a predetermined pressure. ing. The crankshaft is provided with an oil supply hole for supplying lubricating oil stored at the bottom of the hermetic container to the back pressure chamber by a differential pressure.

JP 2007-192189 A

  However, Patent Document 1 does not disclose a countermeasure for a phenomenon in which the pressure increase in the back pressure chamber is delayed at the start, and the orbiting scroll is pressed against the fixed scroll to be brought into close contact with each other and cannot be shifted to high-efficiency operation at an early stage. That is, the lubricating oil is supplied to the back pressure chamber through the oil supply hole provided in the crankshaft to raise the back pressure chamber to a predetermined pressure, and the orbiting scroll is pressed against the fixed scroll by this back pressure and is brought into close contact. In a hermetic scroll compressor, if the pressure in the hermetic container does not increase, the back pressure chamber is less oiled and the pressure increase in the back pressure chamber is slower. It is impossible to shift to high efficiency operation at an early stage. In particular, when carbon dioxide refrigerant (R744 refrigerant) is used as the working fluid, its operating pressure is about three times that of R410A refrigerant, and the above-mentioned problems at the time of starting are remarkable.

  An object of the present invention is to provide a scroll compressor that can shift to high-efficiency operation at an early stage when starting.

  In the first aspect of the present invention for achieving the above-mentioned object, an electric motor part, a compression mechanism part that sucks a working fluid from the outside, compresses it, and discharges it into the space in the sealed container, and the rotational force of the electric motor part Is transmitted to the compression mechanism unit to drive the compression mechanism unit, the electric motor unit, the compression mechanism unit and the sealed container containing the crank shaft therein, and the bottom of the sealed container are stored. And the compression mechanism section is engaged with the fixed scroll having a fixed scroll wrap standing on the fixed scroll base plate and the fixed scroll wrap standing on the orbiting scroll base plate. A revolving scroll having a revolving scroll wrap that forms a compression chamber, a back pressure chamber provided on the back side of the revolving scroll and having an intermediate pressure between suction pressure and discharge pressure, The orbiting scroll has a fine hole penetrating the orbiting scroll base plate and the orbiting scroll wrap from the back pressure chamber, and the crankshaft causes the lubricating oil stored at the bottom of the hermetic container to be In the hermetic scroll compressor having an oil supply path for supplying a back pressure chamber, the asymmetrical operation of starting compression of the orbiting outer line side compression chamber of the orbiting scroll wrap precedes the orbiting inner line side compression chamber of the orbiting scroll wrap. A compression chamber is formed, and a groove is formed on the tooth tip surface of the orbiting scroll wrap so as to conduct the fine hole only to the orbiting outer line side compression chamber.

A more preferable specific configuration example in the first aspect of the present invention is as follows.
(1) It is mounted on a refrigeration air conditioning system or a heat pump water heater, and carbon dioxide is used as the working fluid.
(2) In said (1), the said groove | channel was provided in the position connected to the said rotation outside line side compression chamber immediately before a discharge process immediately after a compression start.
(3) In the above (2), a back pressure adjusting valve for adjusting the back pressure chamber to a predetermined pressure is provided, and an integrated average of the pressures in the turning outer line side compression chamber to which the groove communicates and the back pressure adjusting valve The controlled back pressure chamber pressure should be almost equal.

  Further, in the second aspect of the present invention for achieving the above-mentioned object, an electric motor part, a compression mechanism part that sucks the working fluid from the outside, compresses it, and discharges it into the space in the sealed container, and the electric motor part A crankshaft that transmits a rotational force to the compression mechanism section to drive the compression mechanism section, the electric motor section, the compression mechanism section, the sealed container that houses the crankshaft, and a bottom portion of the sealed container And the lubricating mechanism is stored, and the compression mechanism section includes a fixed scroll having a fixed scroll wrap standing on the fixed scroll base plate, and a stationary scroll lap standing on the orbiting scroll base plate. A revolving scroll having a revolving scroll wrap that forms a compression chamber by combining them, and a back pressure that is provided on the back side of the revolving scroll and is an intermediate pressure between suction pressure and discharge pressure And a back pressure adjustment valve that adjusts the back pressure chamber to a predetermined pressure, and the orbiting scroll has pores that penetrate the orbiting scroll base plate and the orbiting scroll wrap from the back pressure chamber, In the hermetic scroll compressor, the crankshaft is provided with an oil supply path for supplying lubricating oil stored in the bottom of the hermetic container to the back pressure chamber by a differential pressure. Is provided on the tooth tip surface of the orbiting scroll wrap so that the integral average of the pressure of the orbiting outer line side compression chamber to which the groove communicates and the back pressure chamber pressure controlled by the back pressure regulating valve are substantially equal. is there.

  According to the scroll compressor of the present invention, it is possible to shift to high-efficiency operation at an early stage when starting.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, FIG. 2 is a plan view of a orbiting scroll of the scroll compressor of FIG. 1, FIG. 3 is a transverse sectional view of FIG. FIG. 5 is a diagram showing a positional relationship between the tooth tip groove and the compression chamber of the compression mechanism portion of FIG. 1, and FIG. 5 is a diagram showing a pressure range to which the tooth tip groove of the compression mechanism portion of FIG. 4 is exposed.

  The scroll compressor 50 transmits the rotational force of the motor unit 20 to the compression mechanism unit 30, the compression mechanism unit 30 that sucks the working fluid from the outside, compresses it, and discharges it into the space inside the sealed container 1. The crankshaft 4 that drives the compression mechanism 30, the plurality of bearings 22 to 24 that support the crankshaft 4, the lubricating oil 21 that is stored at the bottom of the sealed container 1, and the hermetically sealed housing A container 1. The scroll compressor 50 is mounted on a refrigeration air conditioning system or a heat pump water heater, and carbon dioxide refrigerant is used as a working fluid.

  A suction pipe 10 communicating with the external cycle and a discharge pipe 12 communicating with the external cycle are hermetically connected to the sealed container 1. Refrigerant gas is sucked into the compression mechanism 30 through the suction pipe 10 from the external cycle, and the refrigerant gas discharged into the sealed container 1 is discharged into the external cycle through the discharge pipe 12.

  The electric motor unit 20 includes a rotor 3 in which a crankshaft 4 is press-fitted and fixed at the center, and a stator 4 whose outer periphery is fixed to the sealed container 1 by shrink fitting or the like.

  The compression mechanism unit 30 includes a fixed scroll 6, a turning scroll 7, an Oldham ring 9, a frame 5, a back pressure chamber 17, and a back pressure adjustment valve 17.

  The fixed scroll 6 includes a fixed scroll base plate 6a and a fixed scroll wrap 6b erected on the fixed scroll base plate 6a. The orbiting scroll 7 includes an orbiting scroll base plate 7a, an orbiting scroll wrap 7b standing on the orbiting scroll base plate 7a, and an orbiting scroll boss 7c standing under the orbiting scroll base plate 7a. The fixed scroll 6 is fixed to the frame 5 by bolts 8.

  The fixed scroll 6 and the orbiting scroll 7 form a compression chamber 19 by meshing the laps 6b and 7b with each other. The compression chamber 19 includes a turning outer line side compression chamber 19a formed on the outer periphery side of the orbiting scroll wrap 7b and a turning inner line side compression chamber 19b formed on the inner periphery side of the orbiting scroll 7b. As shown in FIG. 5, the turning outer line side compression chamber 19a and the turning inner line side compression chamber 19b are compressed prior to the compression of the turning inner line side compression chamber 19b. In other words, the compression mechanism 30 forms an asymmetric compression chamber.

  The Oldham ring 9 is slidably disposed across the groove of the orbiting scroll 7 and the groove of the frame 5, and functions as a rotation prevention means that prevents the revolution of the orbiting scroll 7 and allows its revolution.

  The frame 10 is disposed so as to support the orbiting scroll 7 and the Oldham ring 9, and the outer periphery thereof is fixed to the sealed container 1 by welding.

  The back pressure chamber 17 is provided on the back side of the orbiting scroll 7 and is formed in a space surrounded by the fixed scroll 6 and the frame 5. During operation, the back pressure chamber 17 is supplied with lubricating oil 21 through the slewing bearing 22 and the main bearing 23 by a differential pressure, and is set to an intermediate pressure between the suction pressure and the discharge pressure.

  The orbiting scroll 7 has a pore 14 that penetrates the orbiting scroll base plate 7a and the orbiting scroll wrap 7b, and a groove 15 that conducts the pore 14 only to the orbiting outer line side compression chamber 19a. The fine holes 14 are provided so as to open on the back side of the orbiting scroll base plate 7a and the tooth tip surface of the orbiting scroll wrap 7b. The groove 15 communicates with the swirling outer line side compression chamber 19a immediately after the start of compression, and is provided at a position where communication with the swirling outer line side compression chamber 19a is stopped immediately before the discharge process starts. Further, the groove 15 is provided on the tooth tip surface of the orbiting scroll wrap 7b so as to extend in the radial direction.

  The back pressure adjusting valve 17 adjusts the back pressure chamber 18 to a predetermined pressure. The back pressure adjusting valve 17 includes a passage communicating the back pressure chamber 18 and the suction chamber 16, a valve body that opens and closes the passage, and a spring that presses the valve body. When the pressure difference between the back pressure chamber 18 and the suction chamber 16 exceeds a predetermined value, the valve body is opened and lubricating oil flows out from the back pressure chamber 18 to the suction chamber 16 to adjust the pressure in the back pressure chamber 18.

  The crankshaft 4 has an eccentric portion 4a at one end portion thereof, the eccentric portion 4a is fitted into the orbiting scroll boss 7c, and the rotational force of the electric motor unit 5 is transmitted to the orbiting scroll 7 to transmit the orbiting scroll 7. Is to revolve. An oil supply hole 13 is formed in the center of the crankshaft 4 for supplying the lubricating oil 21 stored in the bottom of the sealed container 1 to the plurality of bearings 22 to 24 by differential pressure.

  Next, the basic operation of the scroll compressor 50 will be described with reference to FIGS. 1 to 3. When the crankshaft 4 is rotationally driven by the electric motor unit 20, this rotation is transmitted from the eccentric portion 4 a of the crankshaft 4 to the orbiting scroll 7 via the orbiting bearing 22. As a result, the orbiting scroll 7 orbits around the axis of the fixed scroll 6 with an orbiting radius of a predetermined distance. It is restrained by the Oldham ring 9 so that the turning scroll 7 does not rotate during this turning motion. Then, due to the orbiting motion of the orbiting scroll 7, the compression chamber 19 formed between the laps 6b and 7b continuously moves to the center, and the volume of the compression chamber 19 is continuously reduced according to the movement. Accordingly, the fluid sucked from the suction pipe 10 is sequentially compressed in the compression chamber 19, and the compressed fluid is discharged into the sealed container 1 from the discharge hole 11. The discharged fluid passes through the sealed container 1 and is supplied from the discharge pipe 12 to the refrigeration cycle.

  On the other hand, the lubricating oil 21 is stored in the bottom of the sealed container 1 and the ambient pressure during operation is the discharge pressure, and the pressure in the back pressure chamber 18 is lower than the discharge pressure. The lubricating oil 21 is flowing into the back pressure chamber 18 through the oil supply hole 13 provided in the crankshaft 4. Specifically, a part of the lubricating oil 21 reaches the back pressure chamber 18 while lubricating the main bearing 23 through a lateral hole provided in the crankshaft 4. Further, the other lubricating oil 21 passes through the oil supply hole 13 and reaches the upper portion of the eccentric portion 4 a of the crankshaft 4 to lubricate the slewing bearing 22 and enter the back pressure chamber 18. Here, when the lubricating oil 21 passes through the main bearing 23 and the slewing bearing 22, the lubricating oil 21 is squeezed because the bearing gap is small, and enters the back pressure chamber 18 at a pressure lower than the discharge pressure. When the pressure in the back pressure chamber 18 increases, the lubricating oil 21 that has entered the back pressure chamber 18 opens the back pressure adjustment valve 17 provided in the communication path to the suction chamber 16 and flows out to the suction chamber. Then, the refrigerant is discharged together with the refrigerant from the discharge hole 11 through the compression chamber 19, a part is discharged from the discharge pipe 12 to the refrigeration cycle, and the rest is separated from the refrigerant in the sealed container 1 and stored at the bottom. Is done.

  When the back pressure is increased by the lubricating oil 21 constantly flowing into the back pressure chamber 18 and the refrigerant dissolved therein, a part of the fluid in the back pressure chamber 18 passes through the through hole 14 and the groove 15 and is compressed. 19 flows in. At the same time, the fluid in the back pressure chamber 18 flows into the suction chamber through the back pressure adjustment valve 17. As a result, the pressure in the back pressure chamber 18 is efficiently adjusted to a predetermined pressure. Instead of letting the back pressure regulating valve 17 escape to the suction chamber 16, a predetermined back pressure may be maintained by letting the fluid escape to the compression chamber in the initial stage of compression.

  Next, with reference to FIGS. 4 and 5, the pressure increase in the back pressure chamber 18 using the pores 14 and the grooves 15 will be specifically described.

  When the refrigerant is sucked from the suction chamber 16 with the revolution of the orbiting scroll 7 and compression of the refrigerant is started, most of the refrigerant gas is compressed to the discharge hole 11 and then discharged into the sealed container. As the pressure in the hermetic container 1 increases, the lubricating oil 21 stored in the lower part of the hermetic container 1 passes through the slewing bearing 22 and the main bearing 23 from the oil supply hole 13 drilled in the crankshaft 4 by the differential pressure, and the back pressure chamber. 18 to increase the pressure in the back pressure chamber 18.

  However, since the space in the sealed container 1 is large, the pressure in the sealed container 1 rises slowly. For this reason, the differential pressure for supplying the lubricating oil 21 to the back pressure chamber 18 rises slowly, and a sufficient supply amount cannot be obtained. Thereby, the pressure rise of the back pressure chamber 18 by the lubricating oil 21 becomes slow. Therefore, if only the pressure increase in the back pressure chamber 18 by the lubricating oil 21 is applied, the pressing force of the orbiting scroll 7 to the fixed scroll 6 at the start is weak, and the clearance between the orbiting scroll wrap 7b and the fixed scroll wrap 6b becomes large. This causes a reduction in compression efficiency.

  Therefore, in the present embodiment, a part of the refrigerant gas in the orbiting outer line side compression chamber 19a is sent to the back pressure chamber 18 through the grooves 15 and the pores 14 provided on the tooth tip surface of the orbiting scroll wrap 7b. Is.

  That is, when the compression is started, the swirling outer line side compression chamber 19a is first formed as the compression chamber 19 in advance. Immediately after the compression is started, as shown in FIGS. 4A and 5A, the groove 15 is communicated with the swirling outer line side compression chamber 19a, and the working fluid in the swirling outer line side compression chamber 19a is A part is supplied to the back pressure chamber 18 through the groove 15 and the pore 14. When the orbiting scroll 7 further rotates, as shown in FIGS. 4B and 5B, the groove 15 is continuously communicated with the orbiting outer line side compression chamber 19a, and the inside of the orbiting outer line side compression chamber 19a. A part of the further compressed working fluid is supplied to the back pressure chamber 18 through the groove 15 and the pore 14. From this state, the compression of the turning extension side compression chamber 19b is started. When the orbiting scroll 7 is further rotated, the communication between the groove 15 and the orbiting outer line side compression chamber 19a is closed as shown in FIGS. 4C and 5C. Note that the compression of the turning extension side compression chamber 19b further proceeds from this state as shown in FIG.

  Here, the pressure in the back pressure chamber 18 by being supplied to the back pressure chamber 18 through the groove 15 and the pore 14 is substantially an integral average of the pressure in the swirling outer line side compression chamber 19a. Therefore, as apparent from FIG. 5, the integral average of the pressure in the swirling inner line side compression chamber 19a is faster and larger than the integral average of the pressure in the swirling inner line side compression chamber 19b. The pressure can be increased quickly. This makes it possible to increase the pressure on the back of the previous scroll without having to wait for the pressure in the sealed container to rise sufficiently at the time of start-up. it can.

  Furthermore, in the case of a high-pressure working refrigerant whose operating pressure is about three times that of the R410A refrigerant, such as carbon dioxide refrigerant (R744), the back pressure is not sufficient at the start, and the orbiting scroll is separated from the fixed scroll. Thus, a remarkable effect can be obtained for preventing a phenomenon in which normal operation cannot be performed.

  As described above, the pressure in the back pressure chamber 18 created by the groove 15 and the pore 14 on the tooth tip surface is substantially an integral average of the pressure in the swirling outer line side compression chamber 19a to which the groove 15 and the pore 14 are communicated. However, in this embodiment, the pressure is set to be substantially equal to the back pressure chamber pressure controlled by the back pressure adjusting valve 17. By doing so, the refrigerant gas sent from the groove 15 and the pores 14 to the back pressure chamber 18 is prevented from leaking from the back pressure adjusting valve 17 to the suction chamber 16 or the compression chamber in the early stage of compression and causing a compression loss. be able to.

  Further, according to the present embodiment, when the compression chamber pressure temporarily rises during the liquid return operation and the force for pulling the orbiting scroll 7 away from the fixed scroll 6 increases, the back pressure is linked to the increase in the compression chamber pressure. Since the pressure in the chamber 18 also increases, it is possible to prevent an unstable operation in which the orbiting scroll 7 rotates and rotates.

It is a longitudinal cross-sectional view of the scroll compressor of one Embodiment of this invention. It is a top view of the turning scroll of the scroll compressor of FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a figure which shows the positional relationship of the tooth tip groove | channel and compression chamber of the compression mechanism part of FIG. It is a figure which shows the pressure range to which the tooth tip groove | channel of the compression mechanism part of FIG. 4 is exposed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sealed container, 2 ... Stator, 3 ... Rotor, 4 ... Crankshaft, 5 ... Frame, 6 ... Fixed scroll, 6a ... Fixed scroll base plate, 6b ... Fixed scroll wrap, 7 ... Revolving scroll, 7a ... Revolving scroll base Plate, 7b ... Orbiting scroll wrap, 7c ... Orbiting scroll boss, 8 ... Bolt, 9 ... Oldham ring, 10 ... Suction pipe, 11 ... Discharge hole, 12 ... Discharge pipe, 13 ... Refueling hole, 14 ... Fine hole, 15 ... Groove, 16 ... Suction chamber, 17 ... Back pressure regulating valve, 18 ... Back pressure chamber, 19 ... Compression chamber, 19a ... Swirling outer peripheral side compression chamber, 19b ... Swirling inner peripheral side compression chamber, 20 ... Electric motor part, 21 ... Lubrication Oil, 30 ... compression mechanism, 50 ... scroll compressor.

Claims (5)

An electric motor section;
A compression mechanism that sucks the working fluid from the outside, compresses it, and discharges it into the space in the sealed container;
A crankshaft that transmits the rotational force of the electric motor unit to the compression mechanism unit to drive the compression mechanism unit;
The sealed container in which the electric motor part, the compression mechanism part and the crankshaft are housed;
A lubricating oil stored at the bottom of the sealed container,
The compression mechanism is
A fixed scroll having a fixed scroll wrap erected on the fixed scroll base plate;
A orbiting scroll having an orbiting scroll wrap standing on the orbiting scroll base plate and forming a compression chamber by meshing with the fixed scroll wrap;
A back pressure chamber provided on the back side of the orbiting scroll and having an intermediate pressure between a suction pressure and a discharge pressure,
The orbiting scroll has pores that penetrate the orbiting scroll base plate and the orbiting scroll wrap from the back pressure chamber,
In the hermetic scroll compressor, the crankshaft is provided with an oil supply path for supplying lubricating oil stored at the bottom of the hermetic container to the back pressure chamber by a differential pressure.
Forming an asymmetric compression chamber that starts compression in advance of the orbiting scroll side of the orbiting scroll wrap before the orbiting inner line side compression chamber of the orbiting scroll wrap;
A hermetic scroll compressor, characterized in that a groove is formed on the tooth tip surface of the orbiting scroll wrap so as to allow the pores to conduct only to the orbiting outer line side compression chamber.   2. The hermetic scroll compressor according to claim 1, wherein the hermetic scroll compressor is mounted on a refrigeration air conditioning system or a heat pump water heater and uses carbon dioxide as the working fluid.   3. The hermetic scroll compressor according to claim 2, wherein the groove is provided at a position communicating with the swirling outer line side compression chamber immediately after the start of compression and immediately before the discharge process.   4. The back pressure regulating valve according to claim 3, further comprising a back pressure regulating valve that regulates the back pressure chamber to a predetermined pressure, the back pressure regulating valve being controlled by an integral average of the pressure of the turning outer line side compression chamber that communicates with the groove and the back pressure regulating valve. A hermetic scroll compressor characterized in that the pressure chamber pressure is substantially equal. An electric motor section;
A compression mechanism that sucks the working fluid from the outside, compresses it, and discharges it into the space in the sealed container;
A crankshaft that transmits the rotational force of the electric motor unit to the compression mechanism unit to drive the compression mechanism unit;
The sealed container in which the electric motor part, the compression mechanism part and the crankshaft are housed;
A lubricating oil stored at the bottom of the sealed container,
The compression mechanism is
A fixed scroll having a fixed scroll wrap erected on the fixed scroll base plate;
A orbiting scroll having an orbiting scroll wrap standing on the orbiting scroll base plate and forming a compression chamber by meshing with the fixed scroll wrap;
A back pressure chamber provided on the back side of the orbiting scroll and having an intermediate pressure between the suction pressure and the discharge pressure;
A back pressure adjusting valve that adjusts the back pressure chamber to a predetermined pressure, and
The orbiting scroll has pores that penetrate the orbiting scroll base plate and the orbiting scroll wrap from the back pressure chamber,
In the hermetic scroll compressor, the crankshaft is provided with an oil supply path for supplying lubricating oil stored at the bottom of the hermetic container to the back pressure chamber by a differential pressure.
Providing a groove in the tooth tip surface of the orbiting scroll wrap to connect the pore to the compression chamber;
The hermetic scroll compressor characterized in that the integrated average of the pressures in the orbiting outer line side compression chambers to which the groove communicates is substantially equal to the back pressure chamber pressure controlled by the back pressure regulating valve.

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