JP2013213480A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor that improves efficiency in an electric machine part, improves volume efficiency, suppresses the noise of turning scroll separation and performance deterioration, and achieves low oil circulation.SOLUTION: An oil separation mechanism 40 for separating oil from a refrigerant gas discharged from a compression mechanism part 10 is provided. The oil separation mechanism 40 includes: a cylindrical space 41 for swirling the refrigerant gas; an inflow part 42 for making the refrigerant gas discharged from the compression mechanism 10 into the cylindrical space 41; an outlet 43 for discharging the refrigerant gas separated from oil from the cylindrical space 41 to an internal container space 31; a communication hole 49 having a discharge port 44 for discharging the separated oil from the cylindrical space 41 to the other inner container space 32, and communicating with a back pressure chamber 36 provided in the discharge port 44 and the compression mechanism 10.

Description

  The present invention relates to a compressor provided with an oil separation mechanism that separates oil from refrigerant gas discharged from the compression mechanism.

  2. Description of the Related Art Conventionally, a compressor used for an air conditioner, a cooling device, and the like generally includes a compression mechanism section and an electric motor section that drives a rear portion of the compressor in a casing, and compresses the refrigerant gas returned from the refrigeration cycle. Compressed and fed into the refrigeration cycle. Generally, the refrigerant gas compressed by the compression mechanism unit once flows around the motor to cool the motor unit, and then is sent to a refrigeration cycle from a discharge pipe provided in the casing (for example, Patent Documents). 1). That is, the refrigerant gas compressed by the compression mechanism is discharged from the discharge port to the discharge space. Thereafter, the refrigerant gas passes through a passage provided on the outer periphery of the frame and is discharged to the upper part of the motor space between the compression mechanism unit and the motor unit. A part of the refrigerant gas is discharged from the discharge pipe after cooling the electric motor unit. Further, the other refrigerant gas communicates with the upper and lower motor spaces of the motor unit by a passage formed between the motor unit and the inner wall of the casing, cools the motor unit, and then rotates the rotor of the motor unit. And through the gap between the stator and the motor space at the top of the motor section, and discharged from the discharge pipe.

JP-A-5-44667

  However, in the conventional configuration, the high-temperature and high-pressure refrigerant gas compressed by the compression mechanism portion flows through the electric motor portion, so that the electric motor portion is heated by the refrigerant gas and causes a reduction in efficiency of the electric motor portion. It was.

  Also, through the passage provided on the outer periphery of the frame, the high-temperature discharge gas flows through the lower part of the compression mechanism unit, so the compression mechanism unit is heated, and in particular, the refrigerant gas in the low temperature state returned from the refrigeration cycle, Heat is received in the process of being sent to the compression chamber through the suction path. For this reason, the refrigerant gas has already expanded at the time of entering the compression chamber, and there has been a problem that the circulation rate is reduced due to the expansion of the refrigerant gas.

  Furthermore, when a lot of oil is contained in the refrigerant discharged from the discharge pipe, there is a problem that the cycle performance is deteriorated.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a compressor that realizes high efficiency of the motor unit, improvement of volumetric efficiency, and low oil circulation. .

  In the compressor according to the present invention, the oil separation mechanism section has a cylindrical space for rotating the refrigerant gas, an inflow section for flowing the refrigerant gas discharged from the compression mechanism section into the cylindrical space, and one container from the cylindrical space. The inner space has a delivery port for sending out the refrigerant gas from which the oil has been separated, and a discharge port for discharging the separated oil from the cylindrical space. There are a plurality of cylindrical spaces having such a configuration, and at least one discharge port thereof communicates with the intermediate pressure chamber on the back of the movable scroll.

  As a result, it is possible to provide a compressor that achieves high efficiency of the electric motor section, improvement of volumetric efficiency, and low oil circulation.

  According to the present invention, most of the high-temperature and high-pressure refrigerant gas that is compressed by the compression mechanism and delivered from the oil separation mechanism is led to the one container inner space and discharged from the discharge pipe. Therefore, since most of the high-temperature and high-pressure refrigerant gas does not pass through the electric motor part, the electric motor part is not heated by the refrigerant gas, and the efficiency of the electric motor part can be improved.

  In addition, according to the present invention, most of the high-temperature and high-pressure refrigerant gas can be guided to the one container inner space, so that the heating of the compression mechanism portion in contact with the other container inner space can be suppressed. Heating can be suppressed and high volumetric efficiency in the compression chamber can be obtained.

  In addition, according to the present invention, the oil separated by the oil separation mechanism is discharged to the other container space or the intermediate pressure chamber on the back of the movable scroll, so that the oil is mostly retained in the cylindrical space. No. Therefore, the separated oil is blown up in the cylindrical space by the swirling refrigerant gas, and is not sent out together with the refrigerant gas from the outlet, so that stable oil separation can be performed. Furthermore, since the oil is not retained in the cylindrical space, the cylindrical space can be made small.

  Further, according to the present invention, since at least a part of the separated oil is discharged to the intermediate pressure chamber on the back surface of the movable scroll, it is possible to supply oil for adjusting the pressure in the intermediate chamber.

The longitudinal cross-sectional view of the compressor by Embodiment 1 of this invention The longitudinal cross-sectional view of the principal part of the compressor by Embodiment 1 of this invention

  According to a first aspect of the present invention, an airtight container includes a compression mechanism portion that compresses the refrigerant gas and an electric motor portion that drives the compression mechanism portion. A compressor that is divided into a container inner space, provided with a discharge pipe that discharges refrigerant gas from one container inner space to the outside of the sealed container, and an electric motor part is disposed in the other container inner space, and is discharged from the compression mechanism part. An oil separation mechanism that separates oil from the refrigerant gas is provided, and the oil separation mechanism includes a cylindrical space that swirls the refrigerant gas, and refrigerant gas discharged from the compression mechanism in one or more cylindrical spaces. An inflow portion for inflow, a delivery port for sending out refrigerant gas from which oil has been separated from the cylindrical space into one container space, and a discharge port for discharging the separated oil from the cylindrical space; Is provided in the compression mechanism And has a passage to be guided at least one between pressure chamber portion.

  According to this configuration, most of the high-temperature and high-pressure refrigerant gas that is compressed by the compression mechanism and delivered from the oil separation mechanism is led to the one container inner space and discharged from the discharge pipe. Therefore, since most of the high-temperature and high-pressure refrigerant gas does not pass through the electric motor part, the electric motor part is not heated by the refrigerant gas, and the efficiency of the electric motor part can be improved.

  Further, according to this configuration, most of the high-temperature and high-pressure refrigerant gas can be guided to the one container inner space, so that the heating of the compression mechanism portion in contact with the other container inner space can be suppressed. Heating can be suppressed and high volumetric efficiency in the compression chamber can be obtained.

Further, according to this configuration, the oil separated by the oil separation mechanism is discharged together with the refrigerant gas from the discharge port located at the position facing the delivery port, so that the oil is mostly retained in the cylindrical space. No. Therefore, the separated oil is blown up in the cylindrical space by the swirling refrigerant gas, and is not sent out together with the refrigerant gas from the outlet, so that stable oil separation can be performed. Furthermore, since the oil is not retained in the cylindrical space, the cylindrical space can be made small.

  Further, according to this configuration, at least a part of the oil and the high-pressure refrigerant separated by the oil separation mechanism is depressurized by the passage led to the intermediate pressure chamber portion, and the oil is supplied by being led to the intermediate pressure chamber portion. The separation of the orbiting scroll can be suppressed by the compressed internal pressure.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a compressor according to Embodiment 1 of the present invention. As shown in FIG. 1, the compressor according to the present embodiment includes a compression mechanism unit 10 that compresses refrigerant gas and an electric motor unit 20 that drives the compression mechanism unit 10 in the sealed container 1.

  The inside of the sealed container 1 is divided into one container inner space 31 and the other container inner space 32 by the compression mechanism unit 10. The electric motor unit 20 is disposed in the other container space 32. The other container space 32 is divided into a compression mechanism side space 33 and an oil storage side space 34 by the electric motor unit 20. The oil storage section 2 is arranged in the oil storage space 34.

  A suction tube 3 and a discharge tube 4 are fixed to the sealed container 1 by welding. The suction pipe 3 and the discharge pipe 4 lead to the outside of the sealed container 1 and are connected to members constituting the refrigeration cycle. The suction pipe 3 introduces a refrigerant gas from the outside of the sealed container 1, and the discharge pipe 4 guides the refrigerant gas from one container inner space 31 to the outside of the sealed container 1.

  The main bearing member 11 is fixed in the sealed container 1 by welding or shrink fitting, and supports the shaft 5. A fixed scroll 12 is bolted to the main bearing member 11. The orbiting scroll 13 that meshes with the fixed scroll 12 is sandwiched between the main bearing member 11 and the fixed scroll 12. The main bearing member 11, the fixed scroll 12, and the orbiting scroll 13 constitute a scroll-type compression mechanism unit 10.

  Between the orbiting scroll 13 and the main bearing member 11, a rotation restraint mechanism 14 such as an Oldham ring is provided. The rotation restraint mechanism 14 prevents the orbiting scroll 13 from rotating, and guides the orbiting scroll 13 to make a circular orbital motion. The orbiting scroll 13 is eccentrically driven by an eccentric shaft portion 5 a provided at the upper end of the shaft 5. By this eccentric drive, the compression chamber 15 formed between the fixed scroll 12 and the orbiting scroll 13 moves from the outer periphery toward the center, and compresses with a reduced volume.

A suction path 16 is formed between the suction tube 3 and the compression chamber 15. The suction path 16 is provided in the fixed scroll 12. A discharge port 17 of the compression mechanism unit 10 is formed at the center of the fixed scroll 12. A reed valve 18 is provided at the discharge port 17. A muffler 19 that covers the discharge port 17 and the reed valve 18 is provided on one container inner space 31 side of the fixed scroll 12. The muffler 19 isolates the discharge port 17 from one container inner space 31. The refrigerant gas is sucked into the compression chamber 15 from the suction pipe 3 through the suction path 16. The refrigerant gas compressed in the compression chamber 15 is discharged into the muffler 19 from the discharge port 17. The reed valve 18 is pushed open when the refrigerant gas is discharged from the discharge port 17.

  A pump 6 is provided at the lower end of the shaft 5. The suction port of the pump 6 is disposed in the oil storage part 2 provided at the bottom of the sealed container 1. The pump 6 is driven by the shaft 5. Therefore, the oil in the oil storage section 2 can be reliably sucked up regardless of the pressure condition and the operating speed, and no oil runs out at the sliding section. The oil sucked up by the pump 6 is supplied to the compression mechanism 10 through an oil supply hole formed in the shaft 5. If foreign matter is removed from the oil using an oil filter before or after the oil is sucked up by the pump 6, foreign matter can be prevented from being mixed into the compression mechanism unit 10, and further reliability can be improved.

  Part of the oil enters the fitting portion between the eccentric shaft portion 5a and the orbiting scroll 13 and the bearing portion 8 between the shaft 5 and the main bearing member 11 so as to obtain a clearance by the supply pressure and the own weight. The oil is then lubricated, then dropped and returned to the oil storage section 2. The rotation restraint mechanism 14 is disposed in the back pressure chamber 36.

  Next, the oil separation mechanism of the compressor according to the first embodiment will be described with reference to FIGS. 1 and 2. 2 is an enlarged cross-sectional view of the main part of the compression mechanism in FIG. The compressor according to the present embodiment is provided with an oil separation mechanism 40 that separates oil from refrigerant gas discharged from the compression mechanism 10.

  The oil separation mechanism section 40 communicates the cylindrical space 41 for turning the refrigerant gas, the inflow section 42 that communicates the inside of the muffler 19 and the cylindrical space 41, and the cylindrical space 41 and one container inner space 31. It has the delivery port 43 and the discharge port 44 which connects the cylindrical space 41 and the other container internal space 32. The cylindrical space 41 includes a first cylindrical space 41 a formed in the fixed scroll 12 and a second cylindrical space 41 b formed in the main bearing member 11.

  The inflow portion 42 communicates with the first cylindrical space 41a, and preferably the opening of the inflow portion 42 is formed on the inner peripheral surface of the upper end of the first cylindrical space 41a. The inflow portion 42 causes the refrigerant gas discharged from the compression mechanism portion 10 to flow into the cylindrical space 41 from the muffler 19. The inflow portion 42 opens in the tangential direction with respect to the cylindrical space 41.

  The delivery port 43 is formed on the upper end side of the cylindrical space 41 and is formed at least on the side of the in-container space 31 with respect to the inflow portion 42. The delivery port 43 is preferably formed on the upper end surface of the first cylindrical space 41a. And the delivery port 43 sends out the refrigerant gas which isolate | separated oil from the cylindrical space 41 to the one container inner space 31.

  The discharge port 44 is formed on the lower end side of the cylindrical space 41, and is formed at least on the other container internal space 32 side or the back pressure chamber 36 than the inflow portion 42. The discharge port 44 is preferably formed on the lower end surface of the second cylindrical space 41b. The discharge port 44 discharges the separated oil and a part of the refrigerant gas from the cylindrical space 41 to the compression mechanism side space 33.

  Here, the cross-sectional area A of the opening of the delivery port 43 is preferably smaller than the cross-sectional area C of the cylindrical space 41 and larger than the cross-sectional area of the opening of the discharge port 44. When the cross-sectional area of the opening of the delivery port 43 is the same as the cross-sectional area of the cylindrical space 41, the swirling flow of the refrigerant gas is blown out from the delivery port 43 without being guided toward the discharge port 44. Further, when the cross-sectional area of the opening of the discharge port 44 is the same as the cross-sectional area of the cylindrical space 41, the swirling flow of the refrigerant gas blows out from the discharge port 44. Further, by making the cross-sectional area of the opening of the delivery port 43 larger than the cross-sectional area of the opening of the discharge port 44, the flow path resistance at the delivery port 43 is reduced. As a result, the refrigerant gas is more likely to flow to the delivery port 43 than to the discharge port 44.

  In the present embodiment, the first cylindrical space 41 a is formed by drilling at least one or more holes in the outer peripheral portion of the fixed scroll 12, and the second hole by drilling in the outer peripheral portion of the main bearing member 11. The cylindrical space 41b is formed. In addition, a groove that opens in a tangential direction is formed on the end surface on the non-wrap side of the fixed scroll 12 with respect to the first cylindrical space 41 a, and a part of the groove on the first cylindrical space 41 a side is formed by the muffler 19. The inflow part 42 is comprised by covering. Moreover, the delivery port 43 is comprised with the hole formed in the muffler 19, and this hole is arrange | positioned in opening of the 1st cylindrical space 41a. Further, the discharge port 44 is arranged by a communication hole 49 formed in the main bearing member 11 so that the second cylindrical space 41 b and the back pressure chamber 36 are communicated with each other. When there are a plurality of cylindrical spaces 41 a and 41 b, the discharge port 44 a may be sent to the compression mechanism side space 33 through a hole provided in the bearing cover 45 with the same configuration as described above.

  Hereinafter, the operation of the oil separation mechanism 40 according to the present embodiment will be described. The refrigerant gas discharged into the muffler 19 is guided to the cylindrical space 41 through the inflow portion 42 formed in the fixed scroll 12. Since the inflow portion 42 opens in a tangential direction with respect to the cylindrical space 41, the refrigerant gas delivered from the inflow portion 42 flows along the inner wall surface of the cylindrical space 41, and the inner periphery of the cylindrical space 41. A swirling flow is generated on the surface. This swirling flow is a flow toward the discharge port 44. The refrigerant gas contains oil supplied to the compression mechanism unit 10, and while the refrigerant gas is swirling, the oil having a high specific gravity adheres to the inner wall of the cylindrical space 41 by centrifugal force, and the refrigerant gas and To separate.

  The swirl flow generated on the inner peripheral surface of the cylindrical space 41 turns back after reaching the discharge port 44 or in the vicinity of the discharge port 44 and changes to an upward flow passing through the center of the cylindrical space 41. The refrigerant gas from which the oil has been separated by the centrifugal force reaches the delivery port 43 by the upward flow and is sent to the one container inner space 31. The refrigerant gas sent out to one container inner space 31 is sent out from the discharge pipe 4 provided in the one container inner space 31 to the outside of the sealed container 1 and supplied to the refrigeration cycle.

  The oil separated in the cylindrical space 41 is sent to the back pressure chamber 36 through the communication hole 49 provided in the main bearing member 11 from the discharge port 44 together with a small amount of refrigerant gas. In the process of passing through 49, the pressure is reduced and sent to the back pressure chamber, and the pressure is reduced by the hole connecting the back pressure chamber and the compression chamber. As a result, the orbiting scroll 13 operates stably without leaving the fixed scroll 12 or hitting it.

  Further, when there are a plurality of cylindrical spaces 41, the oil separated by the same configuration is sent to the compression mechanism side space 33 from the discharge port 44a together with a small amount of refrigerant gas. The oil sent out to the compression mechanism side space 33 reaches the oil storage part 2 through the wall surface of the sealed container 1 and the communication path of the electric motor part 20 due to its own weight.

  The refrigerant gas sent out to the compression mechanism side space 33 passes through the gap of the compression mechanism portion 10, reaches one container inner space 31, and is sent out from the discharge pipe 4 to the outside of the sealed container 1.

In the oil separation mechanism 40 according to the present embodiment, the delivery port 43 is formed on the one container inner space 31 side with respect to the inflow part 42, and the discharge port 44 is formed on the other container inner space 32 side with respect to the inflow part 42. To do. Therefore, a swirl flow is generated on the inner peripheral surface of the cylindrical space 41 between the inflow portion 42 and the discharge port 44, and swirl at the center of the cylindrical space 41 between the discharge port 44 and the delivery port 43. A flow in the opposite direction to the flow is generated. Therefore, as the discharge port 44 moves away from the inflow portion 42, the number of revolutions of the refrigerant gas increases and the oil separation effect increases. Further, since the swirling refrigerant gas passes through the central portion of the swirling flow, the delivery port 43 only needs to be on the side opposite to the discharge port from the inflow portion 42. That is, the effect of oil swirl separation can be enhanced by increasing the distance between the inflow portion 42 and the discharge port 44 as much as possible.

  In addition, the oil separation mechanism 40 according to the present embodiment discharges the oil together with the refrigerant gas from the discharge port 44 without storing the separated oil in the container inner space 32. An action of guiding the generated swirling flow toward the discharge port 44 is provided.

  If the discharge port 44 is not formed in the cylindrical space 41 and the oil is stored in the cylindrical space 41, the flow that pulls to the outside from the discharge port 44 does not occur, so the swirl flow disappears before reaching the oil surface. If it reaches the oil level, it will roll up the oil. Moreover, in order to exhibit the oil separation function without forming the discharge port 44 in the cylindrical space 41, it is necessary to form a space sufficient to store oil.

  However, by discharging the oil from the discharge port 44 together with the refrigerant gas as in the oil separation mechanism unit 40 according to the present embodiment, the swirling flow can be guided to the discharge port 44 and the oil is not wound up.

  According to the present embodiment, most of the high-temperature and high-pressure refrigerant gas compressed by the compression mechanism unit 10 and delivered from the oil separation mechanism unit 40 is guided to the one container inner space 31 and discharged from the discharge pipe 4. Is done. Therefore, most of the high-temperature and high-pressure refrigerant gas does not pass through the electric motor unit 20, so that the electric motor unit 20 is not heated by the refrigerant gas, and the electric motor unit 20 can be highly efficient.

  In addition, according to the present embodiment, most of the high-temperature and high-pressure refrigerant gas is guided to the one container inner space 31, so that the heating of the compression mechanism unit 10 in contact with the other container inner space 32 can be suppressed. In addition, heating of the suction refrigerant gas can be suppressed, and high volumetric efficiency in the compression chamber can be obtained.

  In addition, according to the present embodiment, the oil separated by the oil separation mechanism 40 is discharged together with the refrigerant gas to the other container space 32, so that the oil is mostly retained in the cylindrical space 41. No. Therefore, the separated oil is blown up in the cylindrical space 41 by the swirling refrigerant gas and is not sent together with the refrigerant gas from the delivery port 43, so that stable oil separation can be performed. Further, since the oil is not retained in the cylindrical space 41, the cylindrical space 41 can be made small.

  Moreover, according to this Embodiment, since the oil storage part 2 is arrange | positioned in the oil storage side space 34 and oil is not stored in the compression mechanism side space 33, the airtight container 1 can be reduced in size. Further, according to the present embodiment, the muffler 19 that isolates the discharge port 17 of the compression mechanism 10 from the one container inner space 31 is disposed, and the inside of the muffler 19 and the cylindrical space 41 are separated by the inflow portion 42. By communicating, the refrigerant gas compressed by the compression mechanism unit 10 can be reliably guided to the oil separation mechanism unit 40. That is, since all the refrigerant gas passes through the oil separation mechanism 40, the oil can be efficiently separated from the refrigerant gas. Further, since most of the high-temperature refrigerant gas discharged from the discharge port 17 is discharged from the discharge pipe 4 to the outside of the sealed container 1 without passing through the other container inner space 32, the electric motor unit 20 and the compression mechanism The heating of the part 10 can be suppressed.

  Further, according to the present embodiment, since the cylindrical space 41 is formed in the fixed scroll 12 and the main bearing member 11, the path through which the refrigerant gas flows from the discharge port 17 to the discharge pipe 4 can be configured to be short and sealed. The container 1 can be reduced in size.

Further, according to the present embodiment, the pressure of the back pressure chamber can be easily configured by introducing the separated oil to the back pressure chamber 36, and the revolving scroll 13 is operated in a stable state without being separated from the fixed scroll 12. It becomes possible.

  The present invention can be applied to a compressor having a compression mechanism section and an electric motor section in a sealed container such as a scroll compressor and a rotary compressor, and is particularly suitable for a compressor using a high-temperature refrigerant.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Oil storage part 4 Discharge pipe 10 Compression mechanism part 11 Main bearing member 12 Fixed scroll 17 Discharge port 19 Muffler 20 Electric motor part 31 Container inner space 32 Container inner space 33 Compression mechanism side space 34 Oil storage side space 40 Oil separation Mechanism part 41 Cylindrical space 42 Inflow part 43 Outlet 44 Outlet 49 Communication hole

Claims (1)

A compression mechanism that compresses the refrigerant gas, and an electric motor that drives the compression mechanism are provided in a sealed container.
By the compression mechanism, the inside of the sealed container is divided into one container inner space and the other container inner space,
A compressor in which a discharge pipe for discharging the refrigerant gas from the one container inner space to the outside of the sealed container is provided, and the electric motor unit is disposed in the other container inner space;
An oil separation mechanism for separating oil from the refrigerant gas discharged from the compression mechanism;
The oil separation mechanism is
A cylindrical space for swirling the refrigerant gas;
An inflow portion for allowing the refrigerant gas discharged from the compression mechanism portion to flow into the cylindrical space;
From the cylindrical space to the one container inner space, a delivery port for sending the refrigerant gas separated from the oil, and a discharge port for discharging the separated oil from the cylindrical space,
The said discharge port is a compressor which has a communicating hole connected with the back pressure chamber of the said compression mechanism part.