EP3249317B1 - Oil return circuit and oil return method for refrigerating cycle - Google Patents

Oil return circuit and oil return method for refrigerating cycle Download PDF

Info

Publication number
EP3249317B1
EP3249317B1 EP16755055.7A EP16755055A EP3249317B1 EP 3249317 B1 EP3249317 B1 EP 3249317B1 EP 16755055 A EP16755055 A EP 16755055A EP 3249317 B1 EP3249317 B1 EP 3249317B1
Authority
EP
European Patent Office
Prior art keywords
oil
circuit
compressor
return
refrigerant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16755055.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3249317A4 (en
EP3249317A1 (en
Inventor
Yoshiaki Miyamoto
Yoshiyuki Kimata
Yogo Takasu
Kazuki Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Thermal Systems Ltd
Original Assignee
Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Thermal Systems Ltd filed Critical Mitsubishi Heavy Industries Thermal Systems Ltd
Publication of EP3249317A1 publication Critical patent/EP3249317A1/en
Publication of EP3249317A4 publication Critical patent/EP3249317A4/en
Application granted granted Critical
Publication of EP3249317B1 publication Critical patent/EP3249317B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
    • 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
    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • 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
    • F25B2500/16—Lubrication
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2105—Oil temperatures

Definitions

  • the present invention relates to an oil return circuit and an oil return method for a refrigerating cycle using a R32 refrigerant or a R32 refrigerant-rich mixed refrigerant (hereinafter, referred to simply as a R32 refrigerant), in which a global warming potential (hereinafter, referred to as GWP) is low.
  • a R32 refrigerant or a R32 refrigerant-rich mixed refrigerant (hereinafter, referred to simply as a R32 refrigerant)
  • GWP global warming potential
  • a R32 refrigerant has an ozone depletion potential (ODP) of zero and a low GWP of about 1/3 of that of a R410A refrigerant, and therefore, the R32 refrigerant can contribute to a reduction of environmental burden and is used as an alternative refrigerant for the R410A refrigerant.
  • ODP ozone depletion potential
  • a discharge gas temperature rises by a temperature in a range of about 10 to 20°C, as compared with the R410A refrigerant, and the discharge gas temperature tends to rise as a pressure ratio between suction pressure and discharge pressure increases, and thus an oil temperature in a compressor rises due to return oil from an oil separator.
  • oil viscosity decreases, and therefore, it is necessary to limit an allowable operating range or condition, compared to the R410A refrigerant.
  • PTL 1 discloses a refrigerating cycle in which an oil separator is provided in a discharge circuit of a compressor, and during the cooling operation, a refrigerant containing oil discharged from the compressor is directly cooled from the oil separator through a first bypass flow path by a cooler and then returned into a housing of the compressor, where the oil is separated, and only the refrigerant is circulated to a condenser through a second bypass flow path, whereby an oil temperature rise in the compressor is suppressed.
  • the refrigerant and the oil are separated from each other by the oil separator, the refrigerant is circulated to the condenser to be provided for heating, and the oil is cooled through the first bypass flow path and the cooler and then returned to the compressor, whereby a rise in oil temperature and a decrease in heating capacity are suppressed.
  • the separated oil is returned to the compressor or a suction circuit of the compressor by an oil return circuit, alternatively, an oil cooler is provided in the oil return circuit and the oil is cooled as necessary and then returned to the compressor side.
  • each of the first bypass flow path and the second bypass flow path must be formed by high-pressure gas piping having a relatively large diameter, and thus a compressor structure and a piping structure around it become complicated and expensive, and there is a problem such as being unable to be applied to a refrigerating cycle using a low-pressure housing type compressor.
  • the present invention has been made in view of such circumstances and has an object to provide an oil return circuit and an oil return method for a refrigerating cycle in which even in a case of using a R32 refrigerant in which a discharge gas temperature becomes high, it is possible to suppress a rise in oil temperature in a compressor and secure an allowable operating range or condition equivalent to that for a R410A refrigerant, and it is possible to suppress an increase in oil circulation rate or the influence on the capacity or the performance of the refrigerating cycle.
  • an oil return circuit and an oil return method for a refrigerating cycle according to the present invention adopt the following means.
  • a refrigerating cycle with an oil return circuit includes as defined by claim 1: a refrigerating cycle which is provided with a compressor in which an inside of a housing having an oil reservoir has a low-pressure atmosphere, and has a R32 refrigerant or a R32-rich mixed refrigerant filled in the cycle; an oil separator provided in a discharge circuit from the compressor; and an oil return circuit in which the separated oil by the oil separator is depressurized and the oil returns to the oil reservoir in the housing, in which the oil return circuit is a parallel circuit composed of a direct circuit which directly returns oil from the oil separator to the oil reservoir and a cooling circuit which cools oil by an oil cooler and returns the cooled oil to the oil reservoir, and is provided with an oil temperature control unit which detects at least one of a discharge temperature of the refrigerant and an oil temperature or oil viscosity in the compressor, and when it exceeds a threshold value set in advance, switches the oil return circuit from the direct circuit to the cooling circuit to
  • the oil return circuit is switched from the direct circuit to the cooling circuit so as to cool oil to a temperature less than or equal to a predetermined temperature by the oil cooler and return the cooled oil to the oil reservoir in the housing of the compressor, whereby it is possible to limit an oil temperature rise in the compressor to a value less than or equal to a specified value.
  • the oil separated by the oil separator can be directly returned to the oil reservoir in the housing, and therefore, it is possible to prevent re-mixing with the refrigerant gas and suppress an increase in oil circulation rate in order to hold the returned oil in the oil reservoir, and it is only necessary to cool oil only when necessary, and thus it is possible to minimize the influence on the capacity or the performance of the refrigerating cycle.
  • the compressor in the oil return circuit for a refrigerating cycle described above, is a low-pressure housing type scroll compressor of either a hermetic type or an open type, and the oil reservoir in the housing is filled with PVE oil, POE oil, PAG oil, or a mixed oil containing them as its main component.
  • a low-pressure housing type scroll compressor of a hermetic type or an open type for a R410A refrigerant configured to suction a low-pressure refrigerant gas from the refrigerating cycle side into the housing, suction and compress the refrigerant, and discharge it to a discharge chamber can be applied as it is.
  • PVE oil polyvinyl ether-based oil
  • POE oil polyol ester-based oil
  • PAG oil polyalkylene glycol-based oil
  • mixed oil thereof adapted to the refrigerant is filled, whereby it is possible to configure a refrigerating cycle using the R32 refrigerant or the R32-rich mixed refrigerant and operate the refrigerating cycle while securing an allowable operating range or condition equivalent to that for the R410A refrigerant.
  • an oil return method for a refrigerating cycle is an oil return method for a refrigerating cycle in which an oil separator is provided in a discharge circuit of the compressor of the refrigerating cycle which is provided with a low-pressure housing type compressor and has a R32 refrigerant or a R32-rich mixed refrigerant filled in the cycle, and oil separated by the oil separator is returned to an oil reservoir in a housing of the compressor through an oil return circuit, the oil return method including: detecting at least one of a discharge temperature of the refrigerant and an oil temperature or oil viscosity in the compressor; and limiting an oil temperature rise in the compressor to a value less than or equal to a specified value, when a detection value exceeds a threshold value set in advance, by cooling return oil to a temperature less than or equal to a predetermined temperature by an oil cooler provided in the oil return circuit and returning the oil to the oil reservoir.
  • the present invention even in a case where a discharge gas temperature rises due to using the R32 refrigerant or the R32-rich mixed refrigerant, at least one of the discharge temperature of the refrigerant and the oil temperature or the oil viscosity in the compressor is detected, and when the detection value exceeds a threshold value set in advance, return oil is cooled to a temperature less than or equal to a predetermined temperature by the oil cooler provided in the oil return circuit and returned to the oil reservoir in the housing of the compressor, whereby it is possible to limit an oil temperature rise in the compressor to a value less than or equal to a specified value.
  • the oil separated by the oil separator can be directly returned to the oil reservoir in the housing, and therefore, it is possible to prevent re-mixing with the refrigerant gas and suppress an increase in oil circulation rate in order to hold the returned oil in the oil reservoir, and it is only necessary to cool oil only when necessary, and thus it is possible to minimize the influence on the capacity or the performance of the refrigerating cycle.
  • the oil return circuit is a parallel circuit composed of a direct circuit which directly returns oil from the oil separator to the oil reservoir and a cooling circuit which cools oil by the oil cooler and returns the cooled oil to the oil reservoir, and when at least one of detection values of the discharge temperature of the refrigerant and the oil temperature or the oil viscosity in the compressor exceeds the threshold value, the oil return circuit is switched from the direct circuit to the cooling circuit to cool return oil to a temperature less than or equal to a predetermined temperature by the oil cooler and return the oil to the oil reservoir.
  • the present invention when at least one of the detection values of the discharge temperature of the refrigerant and the oil temperature or the oil viscosity in the compressor is less than or equal to the threshold value, oil is directly returned from the oil separator to the oil reservoir through the direct circuit, and when the detection value exceeds the threshold value, oil can be cooled to a temperature less than or equal to a predetermined temperature by the oil cooler of the cooling circuit and then returned to the oil reservoir. Therefore, it is possible to reliably limit an oil temperature rise in the compressor to a value less than or equal to a specified value, and it is only necessary to cool oil by the oil cooler only when necessary, and thus it is possible to minimize the influence on the capacity or the performance of the refrigerating cycle.
  • the oil return circuit and an oil return method for a refrigerating cycle even in a case where the discharge gas temperature rises due to using the R32 refrigerant or the R32-rich mixed refrigerant, at least one of the discharge temperature of the refrigerant and the oil temperature or the oil viscosity in the compressor is detected, and when it exceeds the threshold value set in advance, the oil return circuit is switched from the direct circuit to the cooling circuit so as to cool oil to a temperature less than or equal to a predetermined temperature by the oil cooler and return the cooled oil to the oil reservoir in the housing of the compressor, whereby it is possible to limit an oil temperature rise in the compressor to a value less than or equal to a specified value.
  • the oil separated by the oil separator can be directly returned to the oil reservoir in the compressor, and therefore, it is possible to prevent re-mixing with the refrigerant gas and suppress an increase in oil circulation rate in order to hold the returned oil in the oil reservoir, and it is only necessary to cool oil only when necessary, and thus it is possible to minimize the influence on the capacity or the performance of the refrigerating cycle.
  • a refrigerant circuit diagram which includes an oil return circuit for a refrigerating cycle according to an embodiment of the present invention is shown
  • Fig. 2 a longitudinal sectional view of a low-pressure housing type compressor which is applied to the refrigerating cycle is shown.
  • a refrigerating cycle 1 here is a refrigerating cycle filled with a R32 refrigerant or a R32-rich mixed refrigerant (hereinafter, referred to simply as a R32 refrigerant) as a refrigerant and is a heat pump cycle which is provided with a four-way switching valve 4 and allows cooling and heating to be performed by switching a refrigerant circulation direction.
  • a R32 refrigerant a R32-rich mixed refrigerant
  • it may be a single cycle for refrigeration or a heat pump.
  • the refrigerating cycle 1 is configured by a closed cycle refrigerant cycle in which a low-pressure housing type compressor 2, an oil separator 3 provided in a discharge circuit 13A of the compressor 2, the four-way switching valve 4 which switches a refrigerant circulation direction, an outdoor-side heat exchanger 6 to which a blower 5 is attached, an electronic expansion valve for heating 7, a receiver 8, an electronic expansion valve for cooling 9, an indoor-side heat exchanger 11 to which a blower 10 is attached, and an accumulator 12 provided in a suction circuit 13B of the compressor 2 are sequentially connected by refrigerant piping 13.
  • the compressor 2 is a hermetic type electric scroll compressor 2, as shown in Fig. 2 .
  • the hermetic type electric scroll compressor 2 is a compressor which is provided with a longitudinally elongated cylinder-shaped housing 14 having a hermetic structure configuring an outer shell and in which a scroll compression mechanism 15 is incorporated into an upper portion of the inside of the housing 14.
  • the scroll compression mechanism 15 is provided with a pair of fixed scroll 16 and orbiting scroll 17, as well known, and is incorporated through a bearing member 18 fixedly installed in the housing 14.
  • a configuration is made in which a high-pressure refrigerant gas compressed by the scroll compression mechanism 15 is discharged into a discharge chamber 19 and sent to the discharge circuit 13A on the refrigerating cycle 1 side through a discharge pipe 20.
  • a motor 21 composed of a stator 22 and a rotor 23 is fixedly installed below the scroll compression mechanism 15.
  • a driving shaft 24 is integrally joined to the rotor 23 of the motor 21, and a crankpin provided at an upper end of the driving shaft 24 is connected to the back surface of the orbiting scroll 17 of the scroll compression mechanism 15 through a drive bush and a slewing bearing, whereby the scroll compression mechanism 15 can be driven.
  • the upper end side of the driving shaft 24 is supported by the bearing member 18, and a lower end portion is supported by a bearing member 25 installed at a lower portion in the housing 14.
  • An oil supply pump 26 is provided between the lower end portion of the driving shaft 24 and the bearing member 25, and thus a configuration is made in which lubricating oil (oil) filled in an oil reservoir 27 of an inner bottom portion of the housing 14 can be supplied to a sliding part of the scroll compression mechanism 15 through an oil supply hole 28 provided in the driving shaft 24.
  • the hermetic type electric scroll compressor 2 provided with such an oil supply mechanism is well known.
  • the compressor 2 does not need to be the hermetic type electric scroll compressor 2 as described above and may be an open type scroll compressor having an oil reservoir in a housing, or other types of compressor other than a scroll compressor.
  • the lubricating oil (oil) which is filled in the oil reservoir 27 in the housing 14 is PVE oil (polyvinyl ether-based oil), POE oil (polyol ester-based oil), or PAG oil (polyalkylene glycol-based oil) having adaptability to the R32 refrigerant, or mixed oil containing them as its main component, and oil having viscosity in a range of about 20 to 150 cP at 40°C is used.
  • a suction pipe 29 is provided at an outer peripheral portion of the housing 14 so as to be open to a space portion between the motor 21 and the scroll compression mechanism 15, and the compressor 2 is connected to the suction circuit 13B on the refrigerating cycle 1 side through the suction pipe 29.
  • the hermetic type electric scroll compressor 2 is regarded as the low-pressure housing type compressor 2 in which the inside of the housing 14 has a low-pressure atmosphere.
  • An oil return circuit 31 for returning oil separated by the oil separator 3 provided in the discharge circuit 13A on the refrigerating cycle 1 side to the oil reservoir 27 on the compressor 2 side is connected to the housing 14 of the hermetic type electric scroll compressor 2, as shown in Fig. 1 .
  • the oil return circuit 31 is configured by a parallel circuit composed of a direct circuit 32 which directly returns oil separated by the oil separator 3 to the oil reservoir 27 through an electromagnetic valve 33 and a capillary tube 34 for pressure reduction and flow rate adjustment, and a cooling circuit 35 which is connected in parallel to the direct circuit 32 and returns the oil from the oil separator 3 to the oil reservoir 27 through an electromagnetic valve 36, an oil cooler 37, and a capillary tube 38 for pressure reduction and flow rate adjustment.
  • a cold source for cooling oil by the oil cooler 37 As a cold source for cooling oil by the oil cooler 37, a part of a high-pressure liquid refrigerant circulating in the refrigerant circuit of the refrigerating cycle 1, a gas-liquid two-phase refrigerant decompressed by the expansion valve, a low-pressure gas refrigerant, or the like is used, and it is possible to adopt a refrigerant cooling type which performs cooling by heat exchange with a refrigerant, an air cooling type which performs cooling by air cooling using the blower 5 attached to the outdoor-side heat exchanger 6, or the like.
  • the oil return circuit 31 has a configuration in which in order to limit an oil temperature rise in the housing 14 of the compressor 2 to a value less than or equal to a specified value, at least one of a discharge temperature of the refrigerant and an oil temperature or oil viscosity in the compressor 2 is detected, and when a detection value exceeds a threshold value set in advance, the oil return circuit 31 is switched from the direct circuit 32 to the cooling circuit 35, so that return oil can be cooled to a temperature less than or equal to a predetermined temperature and then returned to the oil reservoir 27.
  • the oil return circuit 31 has a configuration in which it is provided with an oil temperature control unit 42 which controls opening and closing of the electromagnetic valves 33 and 36 so as to switch the oil return circuit 31 from the direct circuit 32 to the cooling circuit 35, when at least one of a detection value of a discharge temperature sensor 39 provided in the discharge circuit 13A of the refrigerating cycle 1, a detection value of an oil temperature sensor 40 provided at the bottom portion of the housing of the compressor 2, the oil viscosity calculated based on the detection values of a low-pressure pressure sensor 41 provided in the suction circuit 13B of the refrigerating cycle 1 and the oil temperature sensor 40, and the like exceeds a threshold value set in advance, and the return oil from the oil separator 3 is cooled to a temperature less than or equal to a predetermined temperature by the oil cooler 37 and then returned to the oil reservoir 27.
  • an oil temperature control unit 42 which controls opening and closing of the electromagnetic valves 33 and 36 so as to switch the oil return circuit 31 from the direct circuit 32 to the cooling circuit 35, when at least one of a
  • a cooling operation can be performed by circulating a high-temperature and high-pressure refrigerant gas discharged from the compressor 2 to the outdoor-side heat exchanger 6 side by the four-way switching valve 4 and causing the outdoor-side heat exchanger 6 to function as a condenser and the indoor-side heat exchanger 11 to function as an evaporator
  • a heating operation can be performed by circulating the high-temperature and high-pressure refrigerant gas to the indoor-side heat exchanger 11 side by the four-way switching valve 4 and causing the indoor-side heat exchanger 11 to function as a condenser and the outdoor-side heat exchanger 6 to function as an evaporator.
  • oil contained in the discharged refrigerant gas from the compressor 2 is separated by the oil separator 3 provided in the discharge circuit 13A and returned to the oil reservoir 27 of the hermetic type electric scroll compressor 2 which is a low-pressure housing type through the oil return circuit 31.
  • the oil return circuit 31 is a parallel circuit composed of the direct circuit 32 which directly returns oil to the oil reservoir 27 and the cooling circuit 35 which cools oil by the oil cooler 37 and then returns it to the oil reservoir 27. For this reason, in a case where the discharge temperature of the refrigerant which is discharged from the compressor 2 rises and there is a possibility that the oil temperature in the compressor 2 may exceed a threshold value set in advance, it is detected and the oil return circuit 31 is switched from the direct circuit 32 to the cooling circuit 35, so that the return oil can be cooled to a temperature less than or equal to a predetermined temperature by the oil cooler 37 and then returned to the oil reservoir 27.
  • the oil temperature control unit 42 detects at least one of the discharge temperature of the refrigerant which is discharged from the compressor 2 and the oil temperature or the oil viscosity in the compressor 2, on the basis of the detection values of the discharge temperature sensor 39, the oil temperature sensor 40, and the low-pressure pressure sensor 41, and functions, when it exceeds the threshold value set in advance, so as to limit an oil temperature rise in the compressor 2 to a value less than or equal to a specified value by closing the electromagnetic valve 33 from the open state and opening the electromagnetic valve 36 from the closed state, thereby switching the oil return circuit 31 from the direct circuit 32 to the cooling circuit 35 to cool the return oil to a temperature less than or equal to a predetermined temperature and returning the return oil to the oil reservoir 27.
  • the threshold values of the discharge temperature of the refrigerant, the oil temperature in the compressor, and the oil viscosity are set, and when the respective detection values exceed the threshold values, by performing control through the oil temperature control unit 42 so as to switch the oil return circuit 31 from the direct circuit 32 to the cooling circuit 35 to cool the return oil by the oil cooler 37 such that the temperature is lowered by approximately 15 deg and then return the return oil to the oil reservoir 27, it is possible to reduce the oil temperature to the same temperature as in the case of the R410A refrigerant and make the oil viscosity approximately equivalent to that of the R410A refrigerant, and thus it is possible to secure an allowable operating range or condition equivalent to that for the R410A refrigerant.
  • the viscosity of oil depends on solubility in a refrigerant, which is determined according to pressure and a temperature, and it is possible to grasp the viscosity of oil by measuring a temperature and pressure with the oil temperature sensor 40 and the low-pressure pressure sensor 41, as described above, and determining solubility from a pressure/solubility characteristic diagram or the like using the temperature as a parameter.
  • the oil return circuit 31 is switched from the direct circuit 32 which directly returns oil from the oil separator 3 to the oil reservoir 27 of the compressor 2 to the side of the cooling circuit 35 which cools oil by the oil cooler 37 and then returns the oil to the oil reservoir 27, and thus the oil is cooled to a temperature less than or equal to a predetermined temperature by the oil cooler 37 and then returned to the oil reservoir 27 in the housing 14 of the compressor 2, whereby it is possible to limit an oil temperature rise in the compressor 2 to a value less than or equal to a specified value.
  • the oil separated by the oil separator 3 can be directly returned to the oil reservoir 27 in the housing 14 of the compressor 2, and therefore, it is possible to prevent re-mixing with a refrigerant gas and suppress an increase in oil circulation rate in order to hold the returned oil in the oil reservoir, and it is only necessary to cool oil only when necessary, and thus it is possible to minimize the influence on the capacity or the performance of the refrigerating cycle 1.
  • the compressor 2 is the low-pressure housing type scroll compressor 2 of either a hermetic type or an open type, and the oil reservoir 27 in the housing 14 is filled with any oil of PVE oil, POE oil, and PAG oil, or mixed oil containing them as its main component.
  • the oil return circuit 31 is a parallel circuit composed of the direct circuit 32 which directly returns the oil separated by the oil separator 3 from the oil separator 3 to the oil reservoir 27 and the cooling circuit 35 which cools the oil by the oil cooler 37 and then returns it to the oil reservoir 27, and when at least one of the detection values of the discharge temperature of the refrigerant and the oil temperature or the oil viscosity in the compressor 2 exceeds a threshold value, the oil return circuit 31 is switched from the direct circuit 32 to the cooling circuit 35.
  • the return oil is cooled to a temperature less than or equal to a predetermined temperature by the oil cooler 37 and then returned to the oil reservoir 27, and therefore, it is possible to reliably limit an oil temperature rise in the compressor 2 to a value less than or equal to a specified value, and it is only necessary to cool the oil by the oil cooler 37 only when necessary, and thus it is possible to minimize the influence on the capacity or the performance of the refrigerating cycle 1.
  • the discharge temperature sensor 39, the oil temperature sensor 40, and the low-pressure pressure sensor 41 are provided to detect the discharge temperature of the refrigerant and the oil temperature or the oil viscosity in the compressor 2.
  • a configuration may be made such that sensors which are provided for the operation control of the refrigerating cycle 1 are applied to these sensors and the electromagnetic valves 33 and 36 are controlled by using the detection values thereof, and thus it is not necessary to newly install sensors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
  • Rotary Pumps (AREA)
EP16755055.7A 2015-02-26 2016-01-13 Oil return circuit and oil return method for refrigerating cycle Active EP3249317B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015036885A JP6495048B2 (ja) 2015-02-26 2015-02-26 冷凍サイクルの油戻し回路および油戻し方法
PCT/JP2016/050793 WO2016136305A1 (ja) 2015-02-26 2016-01-13 冷凍サイクルの油戻し回路および油戻し方法

Publications (3)

Publication Number Publication Date
EP3249317A1 EP3249317A1 (en) 2017-11-29
EP3249317A4 EP3249317A4 (en) 2018-03-14
EP3249317B1 true EP3249317B1 (en) 2019-04-24

Family

ID=56788097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16755055.7A Active EP3249317B1 (en) 2015-02-26 2016-01-13 Oil return circuit and oil return method for refrigerating cycle

Country Status (6)

Country Link
EP (1) EP3249317B1 (ko)
JP (1) JP6495048B2 (ko)
KR (1) KR102099665B1 (ko)
CN (1) CN107532824A (ko)
AU (1) AU2016225575B2 (ko)
WO (1) WO2016136305A1 (ko)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6704526B2 (ja) * 2017-07-25 2020-06-03 三菱電機株式会社 冷凍サイクル装置
CN110892209B (zh) * 2017-08-04 2021-12-28 三菱电机株式会社 制冷循环装置和热源单元
CN109163479A (zh) * 2018-10-18 2019-01-08 中国科学院广州能源研究所 一种自动回油燃气热泵系统
KR20200071975A (ko) * 2018-12-12 2020-06-22 엘지전자 주식회사 공기조화기
CN110440402B (zh) * 2019-07-02 2021-09-21 青岛海尔空调电子有限公司 空调器及其回油控制方法
WO2021050464A1 (en) * 2019-09-13 2021-03-18 Carrier Corporation Vapor compression system
WO2022085125A1 (ja) * 2020-10-21 2022-04-28 三菱電機株式会社 冷凍サイクル装置
CN113483449B (zh) * 2021-07-09 2022-09-06 青岛海尔空调器有限总公司 室内机回油控制方法
CN114353360B (zh) * 2022-01-06 2024-02-23 青岛海尔空调电子有限公司 双压缩机制冷剂循环系统及其控制方法

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06337171A (ja) 1993-03-30 1994-12-06 Mitsubishi Heavy Ind Ltd 冷凍装置
JPH0719634A (ja) * 1993-06-30 1995-01-20 Mitsubishi Electric Corp 圧縮機ユニット
JPH08152207A (ja) * 1994-11-29 1996-06-11 Sanyo Electric Co Ltd 空気調和機
JPH1183204A (ja) 1997-09-12 1999-03-26 Mitsubishi Heavy Ind Ltd 空気調和機
JP2002139261A (ja) * 2000-11-01 2002-05-17 Mitsubishi Electric Corp 冷凍サイクル装置
JP2005083704A (ja) * 2003-09-10 2005-03-31 Mitsubishi Electric Corp 冷凍サイクル、空気調和機
JP2005214515A (ja) * 2004-01-29 2005-08-11 Mitsubishi Heavy Ind Ltd 冷凍サイクル装置、冷凍サイクル装置の圧縮機、油戻し運転制御方法
JP2006170500A (ja) * 2004-12-14 2006-06-29 Mitsubishi Heavy Ind Ltd 空気調和装置およびその運転方法
JP2006170570A (ja) 2004-12-17 2006-06-29 Hitachi Ltd 冷凍装置
JP5017037B2 (ja) * 2007-09-26 2012-09-05 三洋電機株式会社 冷凍サイクル装置
JP4975052B2 (ja) * 2009-03-30 2012-07-11 三菱電機株式会社 冷凍サイクル装置
CN101576337B (zh) * 2009-04-28 2010-09-08 浙江盾安机电科技有限公司 智能油路控制系统
EP2339266B1 (en) * 2009-12-25 2018-03-28 Sanyo Electric Co., Ltd. Refrigerating apparatus
JP5502459B2 (ja) * 2009-12-25 2014-05-28 三洋電機株式会社 冷凍装置
JP5333305B2 (ja) * 2010-03-18 2013-11-06 パナソニック株式会社 冷凍サイクル装置
JP5903595B2 (ja) * 2011-05-27 2016-04-13 パナソニックＩｐマネジメント株式会社 超低温冷凍装置
JP5988828B2 (ja) 2012-10-29 2016-09-07 ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド 冷凍サイクル装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
JP2016161138A (ja) 2016-09-05
EP3249317A4 (en) 2018-03-14
CN107532824A (zh) 2018-01-02
EP3249317A1 (en) 2017-11-29
KR20170102987A (ko) 2017-09-12
WO2016136305A1 (ja) 2016-09-01
AU2016225575B2 (en) 2018-11-01
KR102099665B1 (ko) 2020-04-10
AU2016225575A1 (en) 2017-08-24
JP6495048B2 (ja) 2019-04-03

Similar Documents

Publication Publication Date Title
EP3249317B1 (en) Oil return circuit and oil return method for refrigerating cycle
JP5798830B2 (ja) 超臨界サイクルヒートポンプ
EP3683524B1 (en) Refrigeration apparatus
EP2136158B1 (en) Refrigerating device
CN107429949B (zh) 制冷循环装置
EP3136010B1 (en) Air-conditioning device
EP3575708B1 (en) Refrigeration cycle device
EP3222924B1 (en) Air conditioning device
JP2008209036A (ja) 冷凍装置
JP2008241065A (ja) 冷凍装置及び冷凍装置の油戻し方法
EP3604970B1 (en) Air-conditioning device, railway vehicle air-conditioning device, and method for controlling air-conditioning device
EP3614071B1 (en) Refrigeration cycle device
EP2762803B1 (en) Two-stage compression device and chilling/air-conditioning device using the same
JP2007322022A (ja) 圧縮機装置および冷媒循環装置
JP2019020080A (ja) 空気調和装置及びその運転方法
JP2013139890A (ja) 冷凍装置
CN112013557B (zh) 制冷设备
JP2008232564A (ja) 冷凍装置及び冷凍装置の制御方法
US20230014957A1 (en) Refrigerant apparatus
EP3098542B1 (en) Refrigeration cycle device
JP2013253734A (ja) 冷凍サイクル装置
JP2012137248A (ja) 冷凍装置
JP2013139896A (ja) 冷凍装置
JP2007285677A (ja) 冷凍装置
JP2013139898A (ja) 冷凍装置

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20170824

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

A4 Supplementary search report drawn up and despatched

Effective date: 20180209

RIC1 Information provided on ipc code assigned before grant

Ipc: F25B 43/02 20060101ALI20180205BHEP

Ipc: F25B 1/00 20060101AFI20180205BHEP

Ipc: F25B 31/00 20060101ALI20180205BHEP

Ipc: F25B 1/04 20060101ALI20180205BHEP

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20181220

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1124616

Country of ref document: AT

Kind code of ref document: T

Effective date: 20190515

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602016012941

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20190424

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190724

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190824

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190724

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190725

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1124616

Country of ref document: AT

Kind code of ref document: T

Effective date: 20190424

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190824

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602016012941

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

26N No opposition filed

Effective date: 20200127

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20200131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200113

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200131

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200131

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200113

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190424

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 602016012941

Country of ref document: DE

Representative=s name: CBDL PATENTANWAELTE GBR, DE

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231130

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20231212

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20231128

Year of fee payment: 9