JP2012036862A - Hermetically-sealed compressor, and refrigerating cycle apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve an issue that, since lubricating oil flows due to pressure difference between inside an oil separator and inside a cylinder chamber, in a conventional hermetically-sealed compressor, in a case where pressure difference between pressure inside the oil separator serving as discharge pressure and pressure inside the cylinder chamber serving as suction pressure is small, at starting of a hermetically-sealed compressor, for example, seizure of sliding part occurs due to insufficient oiling of the lubricating oil, as the result that the lubricating oil becomes difficult to be supplied into the cylinder chamber, which may invite degradation of reliability of a hermetically-sealed compressor.SOLUTION: The exemplary embodiment is to solve the issue, and relates to a hermetically-sealed compressor that has a compression mechanism unit within a hermetically-sealed container in which suction pressure atmosphere prevails internally, and an oil separator connected to a discharge passage of the compression mechanism unit. The hermetically-sealed compressor includes an oiling passage which supplies lubricating oil reserved within the oil separator to a sliding part of the compression mechanism unit, and an oil return passage which leads the lubricating oil from the sliding part of the compression mechanism unit to the oil separator, and further includes a pump device which causes the lubricating oil to flow via the oil return passage and the oiling passage.

Description

 Embodiments described herein relate generally to a hermetic compressor and a refrigeration cycle apparatus using the hermetic compressor.

BACKGROUND ART Refrigeration cycle devices such as air conditioners and heat pump water heaters are provided with a refrigeration cycle circuit including a hermetic compressor for compressing refrigerant.
As a conventional hermetic compressor, an electric motor and a compression mechanism are provided in a hermetic container, and the refrigerant gas is introduced and filled in the hermetic container, and the suction refrigerant gas is sucked into the compression mechanism part and compressed. There is known one that discharges a refrigerant gas compressed in a section from a discharge port to a refrigerant pipe of a refrigeration cycle circuit.

Here, an oil separator for recovering the lubricating oil discharged together with the refrigerant discharged from the compression mechanism section is connected to the discharge passage of the hermetic compressor, and the lubricating oil recovered by the oil separator Is provided for returning the gas into the cylinder chamber provided in the compression mechanism.
The oil separator has a discharge pressure atmosphere, which is higher than the pressure in the cylinder chamber. The lubricating oil recovered from the discharged refrigerant and stored in the oil separator flows in the conducting pipe from the oil separator side to the cylinder chamber side due to a pressure difference between the oil separator and the cylinder chamber.

JP 2006-258002 A

However, in the above-described conventional hermetic compressor, the lubricating oil flows due to the pressure difference between the oil separator and the cylinder chamber, so that the pressure in the oil separator, which is the discharge pressure, at the start of the hermetic compressor, etc. When the pressure difference between the suction pressure and the pressure in the cylinder chamber is small, the lubricating oil is difficult to be supplied into the cylinder chamber.
As a result, seizure occurs in the sliding portion of the compression mechanism due to insufficient lubrication, and the reliability of the hermetic compressor may be reduced.

An embodiment of the present invention solves the above-described problems, and has a compression mechanism in a sealed container whose inside is a suction pressure atmosphere, and a sealed type having an oil separator connected to a discharge passage of the compression mechanism. It relates to a compressor.
The hermetic compressor includes an oil supply passage for supplying lubricating oil stored in the oil separator to the sliding portion of the compression mechanism section, and an oil return for extracting the lubricating oil from the sliding portion of the compression mechanism section to the oil separator. And a pump device that causes the lubricating oil to flow through the oil return passage and the oil supply passage.

1 is a longitudinal sectional view of a hermetic compressor according to a first embodiment of the present invention. The top view of the cylinder which concerns on the 1st Embodiment of this invention. The longitudinal cross-sectional view of the hermetic compressor which concerns on the 2nd Embodiment of this invention. The longitudinal cross-sectional view of the hermetic compressor which concerns on the 3rd Embodiment of this invention. (A) The top view of the partition plate of the compression mechanism part which concerns on the 3rd Embodiment of this invention. (B) The longitudinal cross-sectional view of the discharge valve provided in the partition plate of the compression mechanism part which concerns on the 3rd Embodiment of this invention. 1 is a schematic view of a refrigeration cycle apparatus using a hermetic compressor according to an embodiment of the present invention.

An embodiment of the present invention will be described with reference to FIGS.
Note that the hermetic compressor according to the embodiment of the present invention uses an HFC refrigerant, an HC (hydrocarbon) refrigerant, or a carbon dioxide refrigerant as a working refrigerant. In FIG. 1 thru | or 6, the flow direction of the refrigerant gas of a working refrigerant is shown with a solid line arrow.

(First embodiment)
FIG. 1 is a longitudinal sectional view showing a hermetic compressor according to a first embodiment of the present invention.

A hermetic compressor 1 shown in FIG. 1 has a vertically long cylindrical hermetic container 2 that is long in the vertical direction. The hermetic container 2 is filled with a refrigerant gas having a low suction pressure. Machine.
An electric motor unit 3 and a compression mechanism unit 4 are arranged inside the hermetic container 2, and the electric motor unit 3 is arranged on the upper part of the compression mechanism unit 4.
Lubricating oil 99 is stored in the bottom 2 </ b> A of the sealed container 2. The refrigerant gas is introduced into the upper space in the sealed container 2 from the suction pipe 9B, and is sucked into the compression mechanism section 4 from the upper space in the sealed container 2 through the external suction pipe 9A.

  Further, the hermetic compressor 1 has an oil supply passage 131 including an oil supply pipe 18, an oil supply path 11 in the rotary shaft, and an oil supply path 14T, which will be described later, and an oil return path 132 including an oil return pipe 17. 99 flows in the oil supply passage 131 and the oil return passage 132 in the direction of the broken arrow in the figure.

As shown in FIG. 1, the electric motor unit 3 includes a rotor 3a and a stator 3b. The rotor 3 a is fixed to the upper part of the rotating shaft 5, and the stator 3 b is fixed to the upper inner wall surface of the sealed container 2. The rotor 3a has a built-in permanent magnet, and the stator 3b is provided with a coil. The rotor 3a is disposed with a rotatable gap on the inner peripheral portion of the stator 3b.
In the motor unit 3, the rotor 3 a rotates in accordance with a change in the magnetic field generated in the stator 3 b by AC power supplied from an inverter device (not shown) provided outside the hermetic compressor 1 during driving.
Here, the electric motor unit 3 may use various motors such as a brushless DC motor and an AC motor.

The compression mechanism portion 4 is disposed below the sealed container 2 and has a main bearing 6 having a shaft through hole 6B, a discharge muffler 19 provided on the upper portion of the main bearing 6, and a sub-shaft having a shaft through hole 7B. It has a bearing 7, a cylinder 8 having an inner peripheral surface portion 8 </ b> C, a shaft eccentric portion 5 </ b> A provided on the rotating shaft 5, a cylindrical roller 10, and a vane 12.
A roller 10 fitted to the shaft eccentric portion 5A of the rotating shaft 5 is provided in the inner peripheral surface portion 8C of the cylinder 8 so as to be eccentrically rotatable. Further, the cylinder 8 is provided with a vane groove 11M communicating with the inner peripheral surface portion 8C, and the vane 12 is disposed in the vane groove 11M so as to freely reciprocate in the rotational radius direction of the rotary shaft 5.
The vane 12 has a tip abutting against the outer peripheral surface of the roller 10, and a spring 14 is provided in the vane back chamber 13 on the back side of the vane 12. The tip of the vane 12 is constantly pressed against the outer peripheral surface of the roller 10 by a spring 14.

  A portion above the shaft eccentric portion 5A of the rotating shaft 5 is inserted into the shaft through hole 6A of the main bearing 6, and a portion below the shaft eccentric portion 5A of the rotating shaft 5 is inserted into the shaft through hole 7A of the sub bearing 7. Has been. Here, the rotating shaft 5 is rotatably supported by the main bearing 6 and the sub bearing 7.

  FIG. 2 is a plan view showing the cylinder chamber 9, the roller 10, and the eccentric portion 5 </ b> A of the rotating shaft 5.

  The cylinder chamber 9 is a space surrounded by the outer peripheral surface of the roller 10, the inner peripheral surface portion 8 </ b> C of the cylinder 8, the main bearing 6, and the auxiliary bearing 7, and is divided into a suction port 8 </ b> A side and a discharge port 8 </ b> B side by a vane 12. ing.

The suction port 8A side of the cylinder chamber 9 is a suction chamber 9P for sucking refrigerant gas containing lubricating oil from the suction port 8A, and an oil supply pipe 30 that is a pipe opened upward is provided in communication with the suction port 8A. It has been.
The discharge port 8B side is a compression chamber 9R that compresses a refrigerant gas containing lubricating oil and discharges the refrigerant gas from the discharge port 8B. The discharge port 8B opens upward and communicates with the discharge muffler 19 via a discharge valve (not shown).

As shown in FIG. 1, a rotary shaft oil supply path 11 is formed in the rotary shaft 5 from the lower end of the rotary shaft 5 upward in the central axis direction. Part of 131 is formed.
An annular oil groove 5d is provided in the upper and lower root portions of the shaft eccentric portion 5A of the rotation shaft 5, and an oil supply hole 11e communicating with the oil supply path 11 in the rotation shaft is opened in the oil groove 5d.

The main bearing 6 is provided with an oil supply passage 6 </ b> A that communicates the oil groove 5 d with the vane back chamber 13.
Further, the main bearing 6 is provided with a through hole (not shown) that communicates with the discharge port of the cylinder 8.

  As shown in FIGS. 1 and 2, the spring 14 is accommodated in a vane back chamber 13, and the vane back chamber 13 has a function of a lubricating oil reservoir. The vane 12 shown in FIG. 1 reciprocates along the radial direction of the hermetic container 2 while sliding in contact with the outer peripheral surface of the roller 10 according to the rotation of the eccentric portion 5A of the rotating shaft 5 and the roller 10. It is supposed to be.

As shown in FIG. 1, the suction pipe 9A connects the upper space of the sealed container 2 and the inside of the cylinder chamber 9 through the suction port 8A of the cylinder 8 shown in FIG. 9 A of suction pipes are arrange | positioned outside the airtight container 2, and the piping length of 9 A of suction pipes is made into the length which produces a supercharging effect at the time of operation | movement in the maximum frequency of a closed compressor. This increases the capacity of the hermetic compressor at the maximum frequency.
A suction pipe 9B is connected to the upper end of the sealed container 2.

  The oil separator 15 shown in FIG. 1 communicates with the discharge port 8B side of the cylinder chamber 9 shown in FIG. 2 via a discharge muffler 19 and a discharge passage 16. An oil separator 15 shown in FIG. 1 is a separator that separates refrigerant gas and lubricating oil. The oil separator 15 is attached to the outside of the sealed container 2.

  The discharge passage 16 shown in FIG. 1 is formed in a substantially L shape, and the opening end portion 16 </ b> A opens upward at a position that is approximately 1/3 of the height inside the oil separator 15. Lubricating oil 99 is accommodated in the bottom 2 </ b> A of the sealed container 2 and the bottom 15 </ b> A of the oil separator 15. The level of the lubricating oil 99 in the bottom 2 </ b> A of the hermetic container 2 reaches the vicinity of the upper end of the main bearing 6, but does not reach the motor unit 3.

  The oil supply pipe 18 shown in FIG. 1 has one end connected to the bottom 15A of the oil separator 15 and the other end penetrating through the sealed container 2 and drawn into the sealed container 2. It is connected.

As shown in FIG. 1, an oil supply path 6 </ b> A is formed around the shaft through hole 6 </ b> B of the main bearing 6.
Similarly, an oil supply passage 7 </ b> A is formed around the shaft through hole 7 </ b> B of the auxiliary bearing 7. The oil supply passages 6A and 7A are both formed in a ring shape and have an L-shaped vertical cross section. The oil supply passages 6A and 7A are connected to the oil supply path 11 in the rotary shaft via the oil supply holes 11e and oil grooves 5d provided in the rotary shaft 5. Communicate.

The oil return pipe 17 is formed in a substantially bowl shape, one end opening 17A is opened to the bottom 15A of the oil separator 15, and the other end opening 17B is opened to the oil supply path 14T of the main bearing 6. Thereby, the vane back chamber 13, the oil return pipe 17, and the oil supply path 11 in the rotating shaft communicate with each other via the oil supply path 14T.
Lubricating oil 99 can be reliably supplied to the sliding surface of the vane 12 via the oil supply path 11 in the rotating shaft and the oiling path 14T, and seizure of the vane 12 and increase in sliding loss due to lack of lubricating oil can be prevented.

As shown in FIG. 1, a positive displacement oil pump device 100, which is a pump device, is provided at the lower end of the rotating shaft 5.
Various pumps may be used as the pump device, but in this embodiment, a positive displacement pump device that is not easily affected by the pressure difference is used, and in particular, a trochoid pump device that has been used in a scroll compressor is used. As a result, the lubricating oil 99 can be supplied satisfactorily even when the hermetic compressor 1 having a small pressure difference is started.

The positive displacement oil pump device 100 is driven in synchronism with the rotation of the rotary shaft 5, and is connected to the lower end portion 15 </ b> A of the oil separator 15 via the oil supply pipe 18.
The positive displacement oil pump device 100 is configured to cause the lubricating oil at the bottom 15A of the oil separator 15 to flow to the oil return passage 132 via the oil supply passage 131.

  The positive displacement oil pump device 100 sucks the lubricating oil 99 in the oil separator 15 through the oil return pipe 17. Then, through the in-rotation shaft oil supply passage 11, the oil supply hole 11 e and the oil supply passages 6 </ b> A and 7 </ b> A provided in the rotation shaft 5, the sliding surfaces of the main bearing 6 and the auxiliary bearing 7 and the rotation shaft 5, the roller 10 and the cylinder 8 and the sliding surface between the inner peripheral surface of the roller 10 and the outer peripheral surface of the eccentric portion 5 </ b> A of the rotating shaft 5. As described above, the positive displacement oil pump device 100 can positively supply the lubricating oil 99 to the sliding surface around the rotating shaft 5. Thereby, lubricating oil is supplied also in the cylinder chamber 9, the sealing performance of a compression chamber can be improved, and a performance fall can be suppressed. For this reason, the sliding surface is sealed to prevent leakage of the refrigerant gas.

  Next, the operation of the above-described hermetic compressor 1 will be described.

  When the hermetic compressor 1 is operated, the electric motor unit 3 is driven by AC power supplied from an inverter device (not shown), and the rotating shaft 5 rotates and the shaft eccentric portion 5A rotates accordingly. Then, the roller 10 fitted to the shaft eccentric portion 5A rotates to compress and flow the refrigerant gas. Further, the positive displacement oil pump 100 is driven as the rotary shaft 5 rotates.

  The flow of refrigerant gas and lubricating oil will be described below.

The low-pressure refrigerant gas sucked into the sealed container 2 from the compressor suction pipe 9B is sent to the suction chamber 9P of the cylinder chamber 9 in the cylinder 8 through the suction pipe 9A and the suction port 8A.
The refrigerant gas sent into the suction chamber 9P is compressed by the roller 10 that rotates eccentrically in the cylinder chamber 9 to become high-pressure refrigerant gas containing the lubricating oil 99, and the discharge port 8B, the discharge muffler 19 and the discharge of the compression chamber 9R. It passes through the passage 16 and is ejected from the opening end portion 16 </ b> A toward the oil separator 15.
In the oil separator 15, the lubricating oil 99 is separated from the high-pressure refrigerant gas by the ejection of the high-pressure refrigerant gas containing the lubricating oil 99 and stored in the bottom portion 15 </ b> A of the oil separator 15.
Here, the inside of the oil separator 15 is filled with compressed refrigerant gas and has a high pressure, and the compressed refrigerant gas is discharged from a compressor discharge pipe 15B provided in the upper part of the oil separator 15 and is described later. Cycle through the cycle circuit.

The lubricating oil 99 stored in the bottom 15 </ b> A of the oil separator 15 is sucked into the positive displacement oil pump 100 provided below the compression mechanism unit 4 through the oil supply pipe 18.
The positive displacement oil pump 100 is driven in conjunction with the rotation of the rotary shaft 5 and feeds the lubricating oil 99.

  Lubricating oil 99 is fed from the positive displacement oil pump 100 to the oil supply path 11 in the rotary shaft, flows out from the oil supply hole 11e to the oil groove 5d, is supplied to each sliding surface such as the roller 10 and the bearing, and the clearance between the sliding surfaces A part of the lubricating oil flows out to the bottom 2A of the sealed container 2. When a certain amount of the lubricating oil 99 is stored in the bottom portion 2A and reaches the opening end of the oil supply pipe 30 whose oil surface opens upward, the oil is sucked from the opening end of the oil supply pipe 30 and is connected to the cylinder via the suction port 8A. It is supplied to each sliding surface in the chamber 9.

In the present embodiment, the opening end of the oil supply pipe 30 is provided upward, but it may be provided horizontally or downward with respect to the oil surface of the lubricating oil 99.
When the opening end of the oil supply pipe 30 is provided downward, the oil supply pipe 30 has a negative pressure due to the flow rate of the refrigerant gas at the suction port 8A, so the oil level of the lubricating oil 99 reaches the opening end of the oil supply pipe 30. At that time, the lubricating oil 99 is sucked up and supplied to each sliding surface in the cylinder chamber 9 through the suction port 8A.

Further, the remaining lubricating oil 99 flowing out from the oil supply hole 11 e is also supplied to the vane back chamber 13 through an oil supply path 14 </ b> T provided in the main bearing 6, and lubricates the vane 12.
Furthermore, surplus lubricating oil is led out to the bottom 15 </ b> A of the oil separator 15 through the oil return pipe 17.

  With the above-described configuration, the lubricating oil 99 flows through the lubricating oil path including the oil supply pipe 18 and the oil return pipe 17 and is supplied to each sliding surface in an appropriate amount with the discharge pressure. Since the lubricating oil 99 is supplied to each sliding surface through the gap between the roller 10 in the cylinder chamber 9 and the main bearing 6 and the sub-bearing 7, seizure of the sliding surface due to insufficient lubrication is prevented. High reliability can be ensured.

  Further, since the lubricating oil 99 supplied to each sliding surface from the oil supply path 11 in the rotating shaft is supplied at a discharge pressure higher than the pressure in the sealed container 2, the lubricating oil is easily supplied also into the cylinder chamber 9. As a result, the sealing performance of the compression chamber is improved, and performance degradation is suppressed. Further, since the oil supply is performed by the positive displacement oil pump device 100, even when the difference between the discharge pressure and the suction pressure is small as in the start of the operation of the hermetic compressor 1, the lubricating oil 99 is stably supplied to each sliding portion. Can be supplied.

  Next, a hermetic compressor according to another embodiment of the present invention will be described.

  In the embodiment of the present invention described below, the same components as those of the first embodiment of the present invention shown in FIG. 1 and FIG.

(Second Embodiment)
FIG. 3 is a longitudinal sectional view showing a second embodiment of the present invention.
The hermetic compressor 1A according to the second embodiment has substantially the same configuration as the hermetic compressor 1 of the first embodiment, and a cooling device 120 is provided in the oil supply pipe 18 as a different component. ing.

  The cooling device 120 is a plate fin type radiator that is provided on the outer peripheral surface of the oil supply pipe 18 that is positioned at an intermediate portion between the sealed container 2 and the oil separator 15 and is formed by a plurality of aluminum fins.

With the above-described configuration, in the hermetic compressor 1A of the present embodiment, in addition to the effects of the first embodiment, the heat release performance of the oil supply pipe 18 is improved, so that the oil separator 15 and the oil supply pipe are improved. The oil temperature of the lubricating oil 99 supplied into the sealed container 2 via 18 can be lowered. As a result, even when the compression mechanism unit 4 is operated for a long time at high rotation and high output, it is possible to suppress the decrease in the viscosity due to the increase in the temperature of the lubricating oil 99 and to perform good lubrication.
In addition, in order to improve the heat dissipation of the cooling device 120, you may perform ventilation and water supply to the cooling device 120. FIG. The cooling device 120 is not limited to the plate fin type, and various configurations such as a spine fin or a water heat exchanger may be used.

  (Third embodiment)

Next, a hermetic compressor 1B according to a third embodiment will be described.
In addition, about the structure same as 1st and 2nd embodiment, the same code | symbol is used and the overlapping description is abbreviate | omitted.

  Hereinafter, a configuration unique to the hermetic compressor 1 </ b> B will be described with reference to FIGS. 4 and 5. The flow direction of the refrigerant gas is indicated by a solid line arrow, and the flow of the lubricating oil 99 is indicated by a broken line arrow.

As shown in FIG. 4, the hermetic compressor 1 </ b> B of the third embodiment is a two-cylinder compressor in which the cylinders of the compression mechanism are provided in two stages in the vertical direction.
The compression mechanism section 4 includes an upper stage compression mechanism section 4B having an upper stage side cylinder 20 and a lower stage side compression mechanism section 4C having a lower stage side cylinder 21.

  Further, the hermetic compressor 1B includes an oil supply passage 131 including an oil supply pipe 18, an oil supply passage 11 in the rotary shaft, and an oil supply hole 11e, an oil return passage 22R (see FIG. 5A), and an oil return pipe 17. A return passage 132 is provided. Further, the oil supply passage 131 and the oil return passage 132 cause the lubricating oil to flow through a center hole 22H provided in the partition plate 22 described later.

The upper side compression mechanism part 4B and the lower stage side compression mechanism part 4C are respectively provided with shaft eccentric parts 5B and 5C provided on the rotary shaft 5 and the cylindrical roller 10 in the same manner as the compression mechanism part 4 of the first embodiment. And a vane 12.
Here, the rotating shaft 5 is provided to penetrate the upper stage side compression mechanism part 4B and the lower stage side compression mechanism part 4C in the axial direction, and the two shaft eccentric parts 5B and 5C provided on the rotating shaft 5 are: The phase is shifted by 180 ° in the rotation direction.

  An annular oil groove 5d is provided at the upper end of the upper shaft eccentric part 5B and the lower end of the lower shaft eccentric part 5C of the rotary shaft 5, and the oil groove 5d has an oil supply path in the rotary shaft, respectively. An oil supply hole 11 e communicating with 11 is opened.

A roller 10 is fitted into the shaft eccentric portions 5B and 5C in the inner peripheral surface portion 8C provided in each of the upper cylinder 20 and the lower cylinder 21. The cylinders 20 and 21 include a vane groove 11M, a vane 12 that is slidably disposed in the vane groove 11M, and a spring 14 that presses the vane 12 against the roller 10 according to the first embodiment. 4 is provided.
The upper cylinder 20 and the lower cylinder 21 are vertically divided by a partition plate 22. A main bearing 6 is provided on the upper surface of the upper cylinder 20, and a sub bearing 7 is provided on the lower surface of the lower cylinder 21. Is provided.
The cylinder chamber 9 surrounded by the upper cylinder 20 and the lower cylinder 21, the main bearing 6, the sub bearing 7, the roller 10 and the partition plate 22 has a suction chamber 9P having a suction port 8A and a discharge port 8B by a vane 12. It is divided into compression chambers 9R.
Discharge ports 8 </ b> B of the upper cylinder 20 and the lower cylinder 21 are provided in the partition plate 22 and communicate with a discharge chamber 22 </ b> P (see FIG. 5A) provided in the partition plate 22.
Here, the partition plate 22 includes two plate members 22A and 22B that are stacked one above the other as shown in FIG. A plan view of the plate material 22B is shown in FIG. The plate members 22A and 22B are configured symmetrically with respect to the superimposed surfaces.
The plate members 22A and 22B have a center hole 22H for rotatably inserting the rotary shaft 5 and the discharge chamber 22P described above. The discharge chamber 22P is provided with a discharge valve 23 for boosting the refrigerant gas discharged from the upper cylinder 20 and the lower cylinder 21 to prevent backflow, and a discharge valve stopper 24 for defining the maximum opening of the discharge valve 23. As shown in FIG. 5B, both are fixed to the plate materials 22A and 22B by pins 25.

One end of the discharge passage 16 is provided in the discharge chamber 22P, and the other end of the discharge passage 16 communicates with the inside of the oil separator 15 provided outside the sealed container 2, and the height of the oil separator 15 is increased. It opens upward at a position of approximately 1/3.
The plate members 22A and 22B of the partition plate 22 are provided with an oil return path 22R having one end communicating with the center hole 22H, and one end of the oil return pipe 17 is connected to the other end of the oil return path 22R. Yes. The oil return path 132 is formed by the oil return path 22R and the oil return pipe 17.
The oil return pipe 17 passes through the outside of the sealed container 2 and is connected to the bottom 15 </ b> A of the oil separator 15.
One end of an oil supply pipe 18 is connected to the bottom portion 15A of the oil separator 15, and the other end of the oil supply pipe 18 passes through the sealed container 2 and is drawn into the sealed container 2. Is connected to a positive displacement oil pump 100.

  Similar to the first embodiment, the positive displacement oil pump 100 is fixed to the lower portion of the auxiliary bearing 7 and is driven in conjunction with the rotation of the rotary shaft 5. Further, the positive displacement oil pump 100 is connected to the lower end of the in-rotation shaft oil supply path 11 of the rotation shaft 5 so that the lubricating oil 99 can be supplied.

  Next, the operation of the above-described hermetic compressor 1B will be described.

  During the operation of the hermetic compressor 1B, the electric motor unit 3 is driven by AC power supplied from an inverter device (not shown). Accordingly, the rotating shaft 5 rotates and the two shaft eccentric portions 5B and 5C rotate eccentrically. Then, the roller 10 fitted to the shaft eccentric portions 5B and 5C rotates eccentrically in each cylinder chamber 9, and compresses and flows the refrigerant gas. Further, the positive displacement oil pump 100 is driven as the rotary shaft 5 rotates.

  The flow of refrigerant gas and lubricating oil will be described below.

The low-pressure refrigerant gas sucked into the sealed container 2 from the compressor suction pipe 9B passes through the suction pipes 9A and the suction ports 8A of the upper stage compression mechanism 4B and the lower stage compression mechanism 4C, and enters the cylinders 20 and 21. It is fed into the suction chamber 9P of the cylinder chamber 9.
The refrigerant gas sent into the suction chamber 9 </ b> P is compressed by the roller 10 that rotates eccentrically in the cylinder chamber 9, and becomes a high-pressure refrigerant gas containing the lubricating oil 99. Further, the high-pressure refrigerant gas passes through the discharge port 8P of the compression chamber 9R, the discharge chamber 22P provided in the partition plate 22 and the discharge passage 16, and passes from the opening end portion 16A of the discharge passage 16 to above the oil separator 15. Is ejected.
In the oil separator 15, the lubricating oil 99 is separated from the high-pressure refrigerant gas containing the lubricating oil 99 and stored in the bottom 15 </ b> A of the oil separator 15.
Here, the inside of the oil separator 15 is filled with compressed refrigerant gas and has a high pressure, and the compressed refrigerant gas is discharged from a compressor discharge pipe 15b provided in the upper part of the oil separator 15 and is later-described refrigeration. Cycle through the cycle circuit R.

The lubricating oil 99 stored in the bottom 15 </ b> A of the oil separator 15 is sucked into the positive displacement oil pump 100 provided below the compression mechanism unit 4 through the oil supply pipe 18.
The positive displacement oil pump 100 is driven in conjunction with the rotation of the rotary shaft 5 and feeds the lubricating oil 99.
The lubricating oil 99 is sent from the positive displacement oil pump 100 to the oil supply path 11 in the rotary shaft, flows out from the oil supply hole 11e to the oil groove 5d, and is supplied to each sliding surface such as the roller 10 and the bearing. A part flows out to the bottom 2 </ b> A of the sealed container 2 from the gap between the sliding surfaces. When a certain amount of the lubricating oil 99 that has flowed out is stored in the bottom portion 2A, the lubricating oil 99 is sucked into the suction port 8A from the oil supply pipe 30 (not shown) and supplied to the sliding surfaces in the suction chamber 9P of the cylinder chamber 9.

  Further, the remaining lubricating oil 99 flowing out from the oil supply hole 11 e is led to the bottom 15 A of the oil separator 15 through the center hole 22 H provided in the partition plate 22, the oil return path 22 R and the oil return pipe 17.

  Even in the two-cylinder type hermetic compressor 1B having two compression mechanisms, the lubricating oil 99 flows through the lubricating oil path including the oil supply pipe 18 and the oil return pipe 17 by adopting the above-described configuration. In addition, an appropriate amount of oil is supplied to each sliding surface with a discharge pressure. Since the lubricating oil 99 is supplied to each sliding surface through the gap between the roller 10 in the cylinder chamber 9 and the main bearing 6 and the sub-bearing 7, seizure of the sliding surface due to insufficient lubrication is prevented. High reliability can be ensured.

Further, since the lubricating oil 99 supplied to each sliding surface from the oil supply path 11 in the rotating shaft is supplied at a discharge pressure higher than the pressure in the sealed container 2, the lubricating oil is easily supplied also into the cylinder chamber 9. As a result, the sealing performance of the compression chamber is improved, and performance degradation is suppressed. In addition, since the positive displacement oil pump device 100 supplies oil, the lubricating oil 99 can flow stably even when the difference between the discharge pressure and the suction pressure is small, such as when the hermetic compressor 1B is started. it can.
Furthermore, the lubricating oil 99 can be supplied to the central portion of the compression mechanism portion 4 by connecting the oil supply passage 131 and the oil return passage 132 by the central hole 22H of the partition plate 22. As a result, the vicinity of the center of the compression mechanism 4 that is difficult to cool and easily rises in temperature is cooled by supplying the lubricating oil, and damage to the compression mechanism 4 due to the high temperature can be prevented.

  Next, a refrigeration cycle apparatus 151 equipped with the hermetic compressor according to the first to third embodiments described above will be described with reference to FIG.

The refrigeration cycle apparatus 151 includes a refrigeration cycle circuit R, an inverter apparatus (not shown) that supplies AC power to the hermetic compressor 1 (or 1A, 1B), and a controller (not shown) that controls the entire refrigeration cycle apparatus.
The refrigeration cycle circuit R includes a discharge pipe 15B of the hermetic compressor 1 (or 1A, 1B), a condenser 152, an expansion device 153, an evaporator 154, and a suction of the hermetic compressor 1 (or 1A, 1B). The pipes 9B are sequentially connected by a refrigerant pipe 155.

When the hermetic compressor 1 (or 1A, 1B) is operated in the refrigeration cycle circuit R described above, high-pressure refrigerant gas is discharged from the discharge pipe 15B and flows into the condenser 152 via the refrigerant pipe 155. The refrigerant that has flowed into the condenser 152 radiates heat of condensation to become high-pressure liquid refrigerant, and flows into the expansion device 153 through the refrigerant pipe 155. The high-pressure liquid refrigerant is decompressed by the expansion device 153 to become a low-pressure liquid refrigerant, and flows into the evaporator 154 through the refrigerant pipe 155. The low-pressure liquid refrigerant flowing into the evaporator 154 is deprived of evaporation heat and vaporized to become low-pressure and low-temperature refrigerant gas and is sucked into the hermetic compressor 1 through the refrigerant pipe 155 and the suction pipe 9B.
The refrigeration cycle operation is performed by circulating the refrigerant in the refrigeration cycle circuit R described above.

  The above-described refrigeration cycle apparatus is used, for example, in an air conditioner or a heat pump water heater. That is, the condensation heat of the condenser 152 is used as a high-temperature heat source, and the evaporation heat of the evaporator 154 is used as a low-temperature heat source.

  Also, by using the hermetic compressors of the first to third embodiments, the discharge pressure can be increased as compared with a hermetic compressor in which the inside of the compressor has a discharge pressure. A high-temperature heat source can be obtained in which the heat is even higher.

  The present invention is not limited to the above embodiment. Furthermore, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments of the present invention. For example, you may delete some components from all the components shown by embodiment of this invention. Furthermore, you may combine the component covering different embodiment suitably.

  DESCRIPTION OF SYMBOLS 1 ... Sealed compressor, 2 ... Sealed container, 3 ... Electric motor part, 4 ... Compression mechanism part, 5 ... Rotating shaft, 5d ... Oil groove, 6 ... Main bearing, 6A ... Oil supply path, 7 ... Secondary bearing, 7A ... Oil supply path, 8 ... Cylinder, 9 ... Cylinder chamber, 11 ... Rotary shaft oil supply path, 11M ... Vane groove, 11e ... Oil supply hole, 12 ... Vane, 14T ... Oil supply path, 15 ... Oil separator, 16 ... Discharge passage, 17 ... Oil return pipe, 18 ... Oil supply pipe, 20 ... Upper cylinder, 21 ... Lower cylinder, 22 ... Partition plate, 22H ... Center hole, 22R ... Oil return path, 23 ... Discharge valve, 30 ... Oil supply pipe, 99 ... Lubricating oil, 100 ... Positive displacement oil pump, 120 ... Cooling device, 131 ... Oil supply passage, 132 ... Oil return passage, 151 ... Refrigeration cycle device

Claims (4)

An airtight container with a suction pressure atmosphere inside;
A compression mechanism provided in the sealed container and having a sliding part;
An oil separator connected to a discharge passage for discharging refrigerant gas compressed by the compression mechanism;
An oil supply passage for supplying lubricating oil separated by the oil separator to the compression mechanism;
An oil return passage for leading the lubricating oil supplied from the oil supply passage to the compression mechanism section to the oil separator;
A hermetic compressor including a pump device that causes lubricating oil to flow from the oil supply passage to the oil return passage.   2. The hermetic compressor according to claim 1, wherein the oil supply passage is provided with a cooling device for cooling the lubricating oil in the oil supply passage. The compression mechanism section includes a plurality of cylinders and a partition plate that partitions the plurality of cylinders,
The said partition plate is provided with the center hole which lets the rotating shaft of the said compression mechanism part pass, and the one end of the said oil return channel | path is formed in communication with the said center hole. The hermetic compressor as described.   A refrigeration cycle apparatus comprising the hermetic compressor according to any one of claims 1 to 3.

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