KR101891795B1 - Apparatus for separating oil of a refrigerant-oil mixture in a refrigerant circuit and arrangement with the apparatus and a heat exchanger for cooling the oil - Google Patents

Apparatus for separating oil of a refrigerant-oil mixture in a refrigerant circuit and arrangement with the apparatus and a heat exchanger for cooling the oil Download PDF

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KR101891795B1
KR101891795B1 KR1020160072250A KR20160072250A KR101891795B1 KR 101891795 B1 KR101891795 B1 KR 101891795B1 KR 1020160072250 A KR1020160072250 A KR 1020160072250A KR 20160072250 A KR20160072250 A KR 20160072250A KR 101891795 B1 KR101891795 B1 KR 101891795B1
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South Korea
Prior art keywords
oil
refrigerant
heat exchanger
cooling
compressor
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KR1020160072250A
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Korean (ko)
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KR20170069896A (en
Inventor
나비드 두라니
토니 스피스
다니엘 젠스
로베르토 델라 로베레
르네 융커
크리스토프 바라
마틴 호첼
마티나 파두크
마크 그라프
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한온시스템 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
    • B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/12—Sound
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/13—Vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/18—Optimization, e.g. high integration of refrigeration components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Compressor (AREA)
  • Geometry (AREA)

Abstract

The present invention relates to an apparatus (1) for separating and recirculating oil of a refrigerant-oil mixture in a refrigerant circulation system. The refrigerant circulation system includes a compressor and a heat exchanger for cooling and / or liquefying the refrigerant in the flow direction of the refrigerant. In addition, the refrigerant circulation system includes a pressure pulsation attenuator, which is disposed between the compressor and the heat exchanger for cooling and / or liquefying the refrigerant in the flow direction of the refrigerant. The oil separator 1 is formed in a manner integrated in the pressure pulsation damper. The invention also relates to an arrangement for separating, recirculating and cooling the oil of the refrigerant-oil mixture in the refrigerant circulation system. The arrangement comprises an apparatus 1 for separating and recirculating oil and a heat exchanger 11, 11 ', 11 "for cooling the oil separated by the apparatus 1. The heat exchangers 11, 11 ', 11 ") are disposed between the device (1) and the compressor.

Description

FIELD OF THE INVENTION This invention relates to an apparatus for separating oil from a refrigerant-oil mixture in a refrigerant circulation system and an arrangement having the apparatus and a heat exchanger for cooling the oil. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to a refrigerant- HEAT EXCHANGER FOR COOLING THE OIL}

The present invention relates to an apparatus for separating and recirculating oil of a refrigerant-oil mixture in a refrigerant circulation system. The refrigerant circulation system has a heat exchanger for cooling and / or liquefying the compressor and the refrigerant in the flow direction of the refrigerant. The invention also relates to an arrangement for separating, recirculating and cooling the oil of the refrigerant-oil mixture in the refrigerant circulation system. The arrangement has a device for separating and recirculating the oil and a heat exchanger for cooling the oil separated by the device.

The oil has various functions inside the refrigerant circulation system. This oil is used, on the one hand, for the lubrication function of the movable parts disposed inside the compressor, thus reducing the friction between parts, especially formed of metal parts. This reduces the wear of the compressor. On the other hand, the oil improves the sealing of the compressor to the periphery and the internal sealing between the high and low pressure regions of the refrigerant inside the compressor. Another function of the oil inside the refrigerant circulation system is to absorb and release the heat generated inside the compressor, for example due to friction between the moving parts of the compressor.

Although oil is primarily required only inside the compressor, it is inevitable that the oil will also circulate within the refrigerant circulation system. In this case, the amount of oil circulated and circulated within the refrigerant circulation system depends on many factors. These factors include, inter alia, the design and construction and formation of the compressor and its peripheral components, in particular the refrigerant circulation system, the aging and conditions associated with the wear of the compressor, the operating conditions and system conditions and the mixing of refrigerant and oil.

In the refrigerant circulation systems known in the prior art, the oil circulation rate varies between 1% and 15% of the refrigerant mass flow. The oil of the compressor circulating through the refrigerant circulation system together with the refrigerant has various functions. The oil alters the quality and physical and thermodynamic properties of, for example, the refrigerant-oil mixture. The presence of oil reduces the effectiveness of heat exchangers in the refrigerant circulation system because the oil film acts like an additional insulating layer so that heat transfer inside the heat exchanger when the heat transfer surfaces are covered with the oil film, This is because it is affected. The oil may, in some cases, remain in the oil traps of the so-called refrigerant circulation system, in which the oil traps are formed, in particular, in regions with low refrigerant velocities. The oil collected in the oil traps can suddenly overflow like a liquid vibration column and return to the compressor. In this case, a pressure wave may be generated, which again causes a fluid lock. In low temperature applications, the likelihood of oil movement within the refrigerant circulation system is significantly limited due to the relatively higher viscosity at low temperatures. Reduced oil level inside the compressor can cause irreversible mechanical damage of the compressor. In addition, essentially incompressible oils are not cooled during the inflation process to a lesser degree. The oil is mixed with the refrigerant, in which case the refrigerant partially evaporates. Here, some cooling capacity of the refrigerant, i.e., about 8% to 10%, is used to cool the compressor oil.

US 6,058, 727 A describes a refrigerant circulation system for cooling air with a compressor, a condenser, an expansion member and an evaporator. The refrigerant circulation system also has a flow path for recirculating the oil from the outlet of the compressor to the inlet of the compressor, together with the oil separator and the oil cooler. During refrigerant compression in the gaseous state, the heated oil is cooled before entering the compressor. In this case, heat is transferred from the oil to the refrigerant drawn from the compressor. The oil cooler has an internal heat exchanger as a heat exchanger unit, in which case the heat exchanger unit can be located inside the accumulator of refrigerant.

US 2010/0251756 A1 also discloses a refrigerant for cooling air, comprising a compressor, a condenser, an expansion member and an evaporator, and a flow path for recirculating oil from an outlet of the compressor to an inlet of the compressor together with an oil separator and an oil cooler Describe the circulatory system. The oil cooler is formed as an air-oil heat exchanger and is arranged after the evaporator in the direction of air flow. Heat is transferred from the oil to the cooled air during evaporator perfusion.

US 6,579,335 B2 discloses an apparatus for compressing gaseous fluid with components for compressing gas, separating the oil from the compressed gas to cool the oil, and storing the oil. The oil is again supplied to the compressor together with the gaseous fluid to be compressed. The oil is guided through the heat exchanger for oil cooling. In this case, the heat is transferred from the oil to the gaseous fluid to be compressed. Subsequently, the gaseous fluid is compressed. The oil separator, oil cooler and oil reservoir are arranged in such a way that they are integrated into one common housing. The oil is directed from the oil reservoir to the compressor via a connecting line.

In the case of conventional refrigerant circulations, the refrigerant-oil mixture is directed through a heat exchanger disposed after the compressor. It is also known in the prior art that after the refrigerant-oil mixture is discharged from the compressor, it is separated into a refrigerant portion and an oil portion upon perfusion of the oil separator. The separated oil is subsequently cooled, for example in a refrigerant circulating in the refrigerant circulation system or in heat transfer by means of air in the evaporator, which reduces the efficiency of the refrigerant circulation system.

An object of the present invention is to provide an apparatus for separating oil of a refrigerant-oil mixture in a refrigerant circulation system and an arrangement for cooling the oil. The device and the arrangement must be designed in such a manner that they do not take up much space and the refrigerant circulation system must be operated efficiently and safely. In addition, the apparatus and arrangement must be minimally costly in terms of manufacturing, maintenance and assembly.

The above problem is solved by objects having the features of the independent claim. Improvements are set forth in the dependent claims.

This problem is solved by an apparatus according to the invention for separating and recirculating oil of a refrigerant-oil mixture in a refrigerant circulation system. The refrigerant circulation system has a heat exchanger for cooling and / or liquefying the compressor and the refrigerant in the flow direction of the refrigerant.

According to the inventive concept, the refrigerant circulation system has a pressure pulsation damper, wherein the pressure pulsation damper is arranged between the compressor and the heat exchanger for cooling and / or liquefying the refrigerant in the flow direction of the refrigerant have. The oil separator is formed in a manner integrated in the pressure pulsation damper according to the present invention.

According to an improvement of the present invention, the pressure pulsation attenuator includes an inlet for introducing the refrigerant-oil mixture and an outlet for the refrigerant and an outlet for the oil, respectively. Inside the pressure pulsation damper is preferably formed a collection area for baffle plate and separate oil for incident flow of the refrigerant-oil mixture. Wherein the inlet and the baffle plate are disposed in an upper region of the volume surrounded by the oil separation apparatus and the collection region is disposed below the baffle plate in a lower region of the volume surrounded by the oil separation apparatus.

According to a preferred embodiment of the present invention, the baffle plate is arranged in the flow direction of the refrigerant-oil mixture toward the inlet port in order to change the flow direction and flow rate of the refrigerant-oil mixture as much as possible and to cause maximum separation of refrigerant and oil. , Because the separation as described above is based on the different inertia of the components, i.e., refrigerant and oil. Alternatively, the baffle plate may be angled at an angle of 90 ° to the flow direction of the refrigerant-oil mixture toward the inlet.

According to an advantageous embodiment of the present invention, a closing member for closing the outlet is arranged in the collection area of the oil separator in the direction of the outlet of the oil. The closing member closes the connecting line leading to the compressor between the devices for separating and recirculating the oil, so that the mass flow of the separated oil, which is guided to the compressor, can be regulated. The adjustable and closureable connection to the compressor prevents undesirable bypassing between the high pressure side refrigerant at the compressor outlet and the low pressure side refrigerant at the inlet of the compressor. At this time, the closing member for closing the outlet and the connecting line communicating therewith to the compressor is preferably formed as a float.

By means of the device according to the invention, the oil and the refrigerant, which have been separated from the refrigerant-oil mixture, can be separated and cooled in different mass flows. As a driving potential for cooling the two parts, namely the oil and the refrigerant, and also the heat absorbing fluid, preferably the external air and / or coolant of the coolant circulation system can be used.

This problem is solved by the arrangement according to the invention for separating, recirculating and cooling the oil of the refrigerant-oil mixture in the refrigerant circulation system. The arrangement comprises an oil separation and recirculation device having the features described above according to the concept of the invention and a heat exchanger for cooling the oil separated by the device. The heat exchanger is disposed between the oil separator and the compressor.

According to a first alternative embodiment of the invention, the heat exchanger for cooling the oil separated by the device is formed by at least one coaxial line consisting of coaxially arranged lines. In this case, the heat is transferred to the coolant in the oil, preferably as a heat absorbing fluid. When a refrigerant circulation system is used in an automotive air conditioning system, the refrigerant may circulate, for example, within a low-temperature refrigerant circulation system or a high-temperature refrigerant circulation system.

The heat exchanger is preferably formed as a counterflow heat exchanger in which the oil flows through an inner tube and the coolant is formed between the outer surface of the tube lying inside and the inner surface of the tube lying outside Permeate the gap.

According to a second alternative embodiment of the present invention, the heat exchanger is formed of at least one ribbed tube. In this case, the heat is transferred from the oil to the air as a heat absorbing fluid. The air is guided over the outer surface of the ribbed tube provided with ribs.

According to a third alternative embodiment of the present invention, the heat exchanger is formed of a heat exchanger arranged inside the refrigerant circulation system. In this case, the heat is transferred from the oil to the refrigerant as the heat absorbing fluid. On the refrigerant side, the heat exchanger is preferably arranged between the outlet of the evaporator and the compressor.

It is known that the refrigerant circulation system can be operated not only as a component of a compression chiller but also as a component of a heat pump so that the device according to the present invention can be used not only as a component of a compression chiller, It can also be used as a component of an automotive air conditioning system.

The apparatus is preferably used for a variety of refrigerants such as R134a, R1234yf, R744, R600a, R290, R152a, R32, and mixtures thereof, and may be suitably adjusted for the refrigerants.

In conclusion, the device according to the invention has the following additional advantages:

Since the refrigerant and the oil are separated from each other not by the refrigerant-oil mixture but through the heat exchanger, the pressure loss of the refrigerant is reduced during the perfusion of the heat exchangers,

- increase the efficiency and stability in operation of the system, especially the refrigerant circulation system, since the oil no longer needs to be cooled or heated during perfusion of the refrigerant heat exchangers,

- Reduced costs for the manufacture, maintenance and operation of the refrigerant circulation system because the amount of oil is optimized and minimized with it,

- Reduced required area of total refrigerant circulation, and

- Reduction of acoustical pressure pulsation, especially in refrigerant circulation of air conditioners and heat pump systems.

Further details, features and advantages of embodiments of the present invention will be apparent from the following detailed description of embodiments with reference to the accompanying drawings. Explanation of drawings:
1: device for mechanically separating the oil of the refrigerant-oil mixture of the refrigerant circulation system integrated in the pressure pulsation damper and having a collection area for the oil separated from the baffle plate and
1. An arrangement of the apparatus of FIG. 1 for mechanically separating the oil, the arrangement comprising:
2: a heat exchanger formed by a coaxial tube for cooling the oil,
3: a heat exchanger for cooling the oil, formed by ribbed tubes, and
Figure 4: Heat exchanger for cooling the oil disposed inside the refrigerant circulation system.

Fig. 1 shows an apparatus 1 for separating the oil of the refrigerant-oil mixture G of the refrigerant circulation system. In this case, the device 1 is formed in such a way as to be incorporated in the pressure pulsation damper for refrigerant.

The refrigerant and the oil two parts of the refrigerant-oil mixture G are mechanically separated from each other by the oil separator 1. The oil is separated from the refrigerant-oil mixture, and as a result, there are portions where the refrigerant is large, oil-rich portions or low-refrigerant portions after the separation as described above. The part where the refrigerant is much abbreviated is also abbreviated as refrigerant (KM), and the part where the oil is large is abbreviated as oil. Such mechanical separation is due to inertia as a driving force, which requires a sufficiently large density difference between the components to be separated. The components to be separated, i.e. the sufficiently large difference in density between the refrigerant and the oil, are present in the refrigerant circulation system at the inlet of the heat exchanger operating as an outlet of the compressor or as a condenser / gas cooler. If the refrigerant is liquefied, for example, in sub-critical operation, such as when refrigerant R134a is used, or in a particular ambient environment where carbon dioxide is used, the heat exchanger is denoted as a condenser. Some heat transfer takes place at a constant temperature. During supercritical operation or in supercritical heat release in a heat exchanger, the temperature of the refrigerant decreases steadily. In this case, the heat exchanger is also referred to as a gas cooler. Supercritical operation may occur in a particular ambient environment or operating mode of the refrigerant circulation system where, for example, carbon dioxide is used as the refrigerant.

The oil separator 1, which is also indicated by the combination of a pressure pulsation attenuator with an oil separating function or a pressure pulsation attenuator and an oil separator, due to the formation of a system incorporated in the pressure pulsation attenuator, (2), and an outlet (3) and an oil outlet (4) for the refrigerant (KM), respectively. The inlet 2 is connected to the outlet of the compressor of the refrigerant circulation system not shown in the figure via a connecting line. The connection line 2 thus corresponds to the pressure line of the compressor. The device 1 is a modified pressure pulsation attenuator with an oil separation function and is consequently disposed in the outlet line of the compressor or in the connection line 2 between the compressor and the heat exchanger operating as a condenser / gas cooler, Separate the mixture (G) into refrigerant-rich and oil-rich parts.

The oil is mechanically removed from the refrigerant-oil mixture in relation to the separate oil-collecting area 6, arranged below the baffle plate 5, through the baffle plate 5 incorporated in the device 1 or the pressure pulsation damper And stored separately. In this case the refrigerant-oil mixture G flows into the device 1 through the inlet 2 and impinges on the baffle plate 5 and falls into the collection area 6 located below the baffle plate 5 . The inlet 2 is oriented as perpendicular as possible to the baffle plate 5 as a supply for the refrigerant-oil mixture G. The refrigerant-oil mixture G is introduced into the device 1 and then strikes against the front surface of the baffle plate 5. Due to the sudden fluctuations in the flow velocity and the flow direction, the refrigerant is separated from the refrigerant-rich portion and the oil-rich portion due to the different inertia of the refrigerant-rich portion and the oil-rich portion, Different directional variations are accommodated differently. The oil-rich portion is guided downward into the collection region 6 of the oil separation region in the baffle plate 5. [ The portion with a large amount of refrigerant is guided to the outlet 3 of the coolant KM through the baffle plate 5 at the upper portion of the volume surrounded by the device 1. A filter member 8 in the form of a sieve is disposed on the outlet 3 for the refrigerant KM of the device 1 and as a result the portion where the refrigerant is large flows through the filter member 8. The refrigerant KM is discharged from the device 1 through the outlet 3 and the connection line connected to the outlet 3. The separated, oil-rich portion, which is guided downwardly into the collection region 6, also flows through the filter element 7, which is formed in a sieve.

The oil or oil-rich part is collected in the collection area 6 in the lower region of the device 1 and then discharged from the device 1 via the outlet 4 and the connection line connected to the outlet 4 Is guided onto the pressure face of the compressor of the next refrigerant circulation system. A float 9 is formed in the oil collecting area 6 in the direction of the oil outlet 4 as the collecting area 6 or the closing member of the oil separating apparatus 1. The float 9 is disposed in such a manner that it is supported by the guide member 10. [ The guide member 10 preferably comprises a spring member, in which case the resilient force acts on the float 9 in such a way as to close the device 1. The float 9 is used to prevent refrigerant bypassing through the device 1 from the high pressure side of the refrigerant circulation system to the low pressure side of the refrigerant circulation system and, in particular, when the oil filling level is low inside the collection area 6, Closes the outlet (4). The oil lifts the float 9 formed in the collecting area 6, where the float releases the oil outlet 4 of the device 1, when the stored level of the stored oil is adequate. The device 1 can also be formed without the float 9, in which case the refrigerant bypass is controlled by the choice of the inner diameter of the connecting line leading to the compressor, for example arranged in the outlet 4 of the oil.

The separated oil is discharged from the device 1 and then cooled outside the pressure pulsation attenuator by various methods. In this case, the oil-rich part flows through the heat exchanger, which is also referred to as an oil cooler. The heat is transferred from the oil to the heat absorbing fluid.

Fig. 2 discloses the arrangement of an apparatus 1 for mechanically separating oil from a refrigerant-oil mixture G according to Fig. 1 with a heat exchanger 11 for oil cooling, formed of at least one coaxial tube .

The oil discharged from the apparatus 1 is cooled by a heat exchanger 11 (also referred to as a coaxial tube-heat exchanger) formed of coaxially arranged tubes. Wherein the heat is transferred from the oil to a coolant, especially a water or water-glycol mixture, which flows countercurrently to the oil. While the oil flows through the centrally located tubes, the coolant is guided through the gaps between coaxially arranged tubes. After being discharged from the heat exchanger 11, the oil is again supplied to the refrigerant at the suction surface of the compressor.

In the application of the device 1 and the heat exchanger 11 used in the refrigerant circulation system of the automobile, the coolant preferably circulates inside the low temperature coolant circulation system.

3 shows an arrangement of an apparatus 1 for mechanically separating oil from a refrigerant-oil mixture G according to FIG. 1 with a heat exchanger 11 'for oil cooling, formed by at least one ribbed tube Respectively.

The oil discharged from the apparatus 1 is cooled by a tube having ribs on its outer surface to increase the heat transfer surface and to improve the heat transfer process. The heat is transferred from the oil to the surrounding air. The oil flows inside the tube, while the air is guided over the outer surface provided with the ribs. After being discharged from the heat exchanger 11 ', the oil is again supplied to the refrigerant at the suction surface of the compressor.

In the application of the device 1 and the heat exchanger 11 'used in the refrigerant circulation system of an automobile, the oil is cooled by a relative wind, in particular.

Fig. 4 shows an arrangement of an apparatus 1 for mechanically separating oil from a refrigerant-oil mixture G according to Fig. 1 with a heat exchanger 11 "for cooling the oil disposed inside the refrigerant circulation system have.

The oil discharged from the device 1 is cooled by a heat exchanger 11 "disposed inside the refrigerant circulation system, where the heat is transferred from the oil to the refrigerant. And then flows into the heat exchanger 11 '' at least in a state of saturation. By the heat transferred from the oil to the refrigerant, the refrigerant is overheated before it is introduced into the compressor, resulting in a liquid drop The superheated refrigerant and the cooled oil are mixed before flowing out of the heat exchanger 11 "and introduced into the connecting line 4 which leads to the compressor as the refrigerant-oil mixture, and then returned to the compressor Can be supplied. In an alternative, alternate embodiment, which is not shown, the superheated refrigerant and the cooled oil are directed to the suction side of the compressor in a separate state.

The heat exchanger 11 '' disposed inside the refrigerant circulation system may also be formed as an internal heat exchanger, in which case a flow path for the oil to be cooled is formed as the third flow path of the heat exchanger 11 ''. The internal heat exchanger means a heat exchanger disposed inside the circulation system used for heat transfer between the high-pressure side refrigerant and the low-pressure side refrigerant. In this case, for example, on one side the liquid refrigerant continues to cool after condensation and on the other hand the suction gas is overheated before the compressor.

1: Device for separating oil
2: Connecting line of inlet, refrigerant-oil mixture
3: Refrigerant outlet
4: Oil outlet, oil connection line to compressor
5: Baffle plate
6: Oil collecting area
7: Oil filter member
8: Refrigerant filter element
9: Float
10: Guide member of the float (8)
11, 11 ', 11 ": heat exchanger
KM: A lot of refrigerant and refrigerant

Figure 112016055794247-pat00001
: Oil, oil-rich part
G: Refrigerant-oil mixture

Claims (10)

An apparatus (1) for separating and recirculating oil of a refrigerant-oil mixture in a refrigerant circulation system,
Wherein the refrigerant circulation system includes a heat exchanger for cooling and / or liquefying the compressor and the refrigerant in the flow direction of the refrigerant,
The refrigerant circulation system comprises a pressure pulsation damper and the pressure pulsation damper is arranged between the compressor and the heat exchanger for cooling and / or liquefying the refrigerant in the flow direction of the refrigerant,
- the oil separation device (1) is formed in such a way that it is integrated inside the pressure pulsation damper,
Wherein the pressure pulsation attenuator has an inlet (2) for the inlet of the refrigerant-oil mixture and an outlet (3) for the refrigerant and an outlet (4) for the oil, wherein the inlet 2 and the baffle plate 5 are provided with a baffle plate 5 for the separated oil and surrounded by the device 1, And the collection area (6) is arranged below the baffle plate (5) in a lower area of the volume surrounded by the device (1)
Wherein the baffle plate (5) is arranged so as to extend a refrigerant flow path between the inlet (2) and the outlet (3) for the refrigerant. delete The method according to claim 1,
Characterized in that the baffle plate (5) is oriented perpendicular to the flow direction of the refrigerant-oil mixture towards the inlet (2). The method of claim 3,
Characterized in that a closing member for closing the outlet (4) in the direction of the oil outlet (4) is arranged in the collection area (6). 5. The method of claim 4,
Characterized in that a closing member for closing the outlet (4) is formed in a float (9). An oil separator (1) according to any one of claims 1 to 5 and a heat exchanger (11, 11 ', 11 ") for cooling the oil separated by the device (1) , And wherein the heat exchanger (11, 11 ', 11 ") is disposed between the device (1) and the compressor, for the oil separation, recirculation and cooling of the refrigerant-oil mixture in the refrigerant circulation system. The method according to claim 6,
Characterized in that the heat exchanger (11) is formed by at least one coaxial tube consisting of coaxially arranged tubes, in which the heat is transferred from the oil as a heat absorbing fluid to the coolant, Arrangement for cooling. The method according to claim 6,
The heat exchanger 11 'is formed as at least one ribbed tube, in which the heat is transferred from the oil to the air as a heat absorbing fluid, and the air is introduced into the ribbed tubes Wherein the oil is guided over the outer surface. The method according to claim 6,
Characterized in that the heat exchanger (11 ") is formed as a heat exchanger arranged inside the refrigerant circulation system, in which the heat is transferred from the oil as a heat absorbing fluid to the refrigerant, for oil separation, recirculation and cooling Arrangement. 10. The method of claim 9,
The arrangement for oil separation, recirculation and cooling, characterized in that on the refrigerant side the heat exchanger (11 ") is arranged between the outlet of the evaporator and the compressor.
KR1020160072250A 2015-12-11 2016-06-10 Apparatus for separating oil of a refrigerant-oil mixture in a refrigerant circuit and arrangement with the apparatus and a heat exchanger for cooling the oil KR101891795B1 (en)

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