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WO2018139316A1 - Dispositif de réfrigération - Google Patents

Dispositif de réfrigération Download PDF

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Publication number
WO2018139316A1
WO2018139316A1 PCT/JP2018/001220 JP2018001220W WO2018139316A1 WO 2018139316 A1 WO2018139316 A1 WO 2018139316A1 JP 2018001220 W JP2018001220 W JP 2018001220W WO 2018139316 A1 WO2018139316 A1 WO 2018139316A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
coil temperature
electric motor
temperature
coil
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.)
Ceased
Application number
PCT/JP2018/001220
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English (en)
Japanese (ja)
Inventor
熊倉　英二
古庄　和宏
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Daikin Industries Ltd
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Daikin Industries Ltd
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Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of WO2018139316A1 publication Critical patent/WO2018139316A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive
    • H02P29/64—Controlling or determining the temperature of the winding

Definitions

  • the present invention relates to a refrigeration apparatus.
  • a refrigeration apparatus having a refrigerant circuit connected to a compressor and performing a refrigeration cycle is known and widely used in air conditioners and the like.
  • Patent Document 1 discloses a refrigerant using 1,1,2-trifluoroethylene (HFO-1123) as a refrigerant charged in the refrigerant circuit. Since this refrigerant is easily decomposed by OH radicals in the atmosphere, it has the characteristics of being less affected by the ozone layer and global warming and having excellent cycle performance.
  • HFO-1123 1,1,2-trifluoroethylene
  • Fluorinated hydrocarbons such as the above-mentioned HFO-1123 have the property of easily causing a disproportionation reaction.
  • the disproportionation reaction is a chemical reaction in which the same kind of molecules react with each other to give different products.
  • the disproportionation reaction may occur because the temperature of the high-pressure refrigerant compressed by the compressor becomes higher than a predetermined temperature. There was sex.
  • a technique for suppressing the temperature rise of the high-pressure refrigerant there is a technique in which a temperature sensor is provided in a discharge pipe connected to the compressor and the temperature of the refrigerant flowing through the discharge pipe is controlled to a predetermined temperature or lower.
  • the temperature of the refrigerant may increase due to heat input of the coil of the electric motor during operation.
  • the refrigerant flowing through the discharge pipe tends to radiate heat to the surrounding air, and the temperature of the refrigerant tends to decrease. Therefore, even if the temperature of the refrigerant flowing through the discharge pipe is controlled to be equal to or lower than the predetermined temperature Ts at which the disproportionation reaction can occur, the temperature of the refrigerant passing around the coil exceeds the predetermined temperature Ts, and the refrigerant May cause disproportionation reaction.
  • the present invention has been made paying attention to such a problem, and an object thereof is to provide a refrigeration apparatus capable of preventing a refrigerant from causing a disproportionation reaction due to heat input from an electric motor of a compressor. It is to be.
  • the 1st invention is a refrigeration apparatus provided with the refrigerant circuit (11) to which the compressor (30) which compresses a refrigerant
  • coolant has the property which raise
  • the compressor (30) is driven by the casing (31), the electric motor (32) accommodated in the internal space (S) of the casing (31), and the electric motor (32), A compression mechanism (40) that discharges the compressed refrigerant to the internal space (S) of the casing (31), and refrigerant that has passed around the electric motor (32) in the internal space (S).
  • a control unit (93) that controls the temperature to be equal to or lower than a predetermined temperature Ts.
  • the compressed refrigerant when the refrigerant is compressed by the compression mechanism (40), the compressed refrigerant is discharged from the compression mechanism (40) to the internal space (S).
  • the refrigerant that has flowed into the internal space (S) flows around the electric motor (32) and then flows through the discharge pipe (22), and is used for the refrigeration cycle of the refrigerant circuit (11).
  • the coil temperature detector (70, 92) of the present invention detects the coil temperature of the electric motor (32). “Detecting the temperature” here means not only directly measuring the temperature with a sensor or the like but also estimating the temperature based on some parameter. And a control part (93) controls coil temperature below to predetermined temperature Ts. Thereby, even if the refrigerant flowing around the electric motor (32) receives heat from the coil of the electric motor (32), the temperature of the refrigerant can be prevented from exceeding Ts. As a result, the temperature of the high-pressure refrigerant can be reliably suppressed below the temperature at which the disproportionation reaction occurs.
  • the coil temperature detection unit is a coil temperature estimation unit (92) that estimates the coil temperature based on an operating state of the electric motor (32). .
  • the coil temperature estimation unit (92) estimates the coil temperature of the electric motor (32) based on the operating state of the electric motor (32). For this reason, the coil temperature can be controlled to be equal to or lower than the predetermined temperature Ts without providing a sensor or the like.
  • the third invention is characterized in that, in the first invention, the coil temperature detector is a coil temperature sensor (70) provided in the electric motor (32).
  • the coil temperature sensor (70) which is a coil temperature detector, is provided in the electric motor (32). Thereby, the coil temperature of an electric motor (32) can be calculated
  • a fourth invention is a refrigeration apparatus according to any one of the first to third inventions, wherein the refrigerant is a refrigerant containing HFO-1123.
  • a refrigerant containing HFO-1123 is used as the refrigerant. Since HFO-1123 is easily decomposed by OH radicals in the atmosphere, it has little influence on the ozone layer or global warming. Further, by using a refrigerant containing HFO-1123, the performance of the refrigeration cycle of the refrigeration apparatus is also improved.
  • control is performed to keep the coil temperature of the electric motor (32) below the predetermined temperature Ts. For this reason, it is possible to reliably prevent the temperature of the refrigerant from causing a disproportionation reaction due to the heat input from the coil of the electric motor (32).
  • FIG. 1 is a schematic configuration diagram of a refrigeration apparatus according to an embodiment.
  • FIG. 2 is a longitudinal sectional view of the compressor according to the embodiment.
  • FIG. 3 is a cross-sectional view showing the inside of the compression mechanism according to the embodiment.
  • FIG. 4 is a longitudinal sectional view of a main part of a compressor according to a modification.
  • the refrigeration apparatus is an air conditioner (10) that performs indoor cooling and heating.
  • the air conditioner (10) includes a refrigerant circuit (11) filled with a refrigerant.
  • the refrigerant circulates to perform a vapor compression refrigeration cycle.
  • a refrigerant containing a fluorinated hydrocarbon having a property of causing a disproportionation reaction is used (details will be described later).
  • the air conditioner (10) includes an outdoor unit (12) and an indoor unit (13). There may be two or more indoor units (13) instead of one.
  • the refrigerant circuit (11) includes a compressor (30), an outdoor heat exchanger (16) (heat source heat exchanger), an expansion valve (17), and an indoor heat exchanger (18) (utilizing heat exchanger). And a four-way selector valve (19).
  • the compressor (30), the outdoor heat exchanger (16), and the four-way switching valve (19) are accommodated in the outdoor unit (12).
  • the indoor heat exchanger (18) and the expansion valve (17) are accommodated in the indoor unit (13).
  • an outdoor fan (20) is installed in the vicinity of the outdoor heat exchanger (16). In the outdoor heat exchanger (16), the outdoor air conveyed by the outdoor fan (20) and the refrigerant exchange heat.
  • an indoor fan (21) is installed in the vicinity of the indoor heat exchanger (18). In the indoor heat exchanger (18), the indoor air conveyed by the indoor fan (21) and the refrigerant exchange heat.
  • the four-way selector valve (19) has first to fourth ports (P1 to P4).
  • the first port (P1) is connected to the discharge pipe (22) of the compressor (30)
  • the second port (P2) is connected to the suction pipe (23) of the compressor (30)
  • the third port (P3) is outdoor. It connects with the gas end of the heat exchanger (16)
  • the fourth port (P4) connects with the gas end of the indoor heat exchanger (18).
  • the four-way selector valve (19) switches between a first state (state indicated by a solid line in FIG. 1) and a second state (state indicated by a broken line in FIG. 1). In the first state, the first port (P1) and the fourth port (P4) communicate with each other, and the second port (P2) and the third port (P3) communicate with each other.
  • the indoor heat exchanger (18) becomes a condenser (heat radiator), and the outdoor heat exchanger (16) A refrigeration cycle (heating cycle) serving as an evaporator is performed.
  • the first port (P1) and the third port (P3) communicate with each other
  • the second port (P2) and the fourth port (P4) communicate with each other. Therefore, when the compressor (30) is operated when the four-way switching valve (19) is in the second state, the outdoor heat exchanger (16) becomes a condenser (radiator) and the indoor heat exchanger (18) A refrigeration cycle (cooling cycle) serving as an evaporator is performed.
  • the compressor (30) includes a vertically long cylindrical sealed casing (31).
  • a suction pipe (23) is fixed through the lower portion of the casing (31).
  • a discharge pipe (22) passes through and is fixed to the top (upper end plate) of the casing (31).
  • Oil (refrigeration machine oil) for lubricating each sliding part of the compressor (30) is stored at the bottom of the casing (31).
  • an internal space (S) filled with the refrigerant (discharged refrigerant or high-pressure refrigerant) discharged from the compression mechanism (40) is formed inside the casing (31). That is, the compressor (30) of the present embodiment is configured as a so-called high-pressure dome type in which the internal pressure of the internal space (S) of the casing (31) is substantially equal to the pressure of the high-pressure refrigerant.
  • an electric motor (32), a drive shaft (35), and a compression mechanism (40) are provided in order from top to bottom.
  • the electric motor (32) has a stator (33) and a rotor (34).
  • the stator (33) is fixed to the inner peripheral surface of the body portion of the casing (31).
  • the rotor (34) penetrates the interior of the stator (33) in the vertical direction.
  • a coil (33a) is wound around the teeth (not shown) of the stator (33).
  • a drive shaft (35) is fixed inside the shaft center of the rotor (34). When the electric motor (32) is energized, the drive shaft (35) is rotationally driven together with the rotor (34).
  • the drive shaft (35) is located on the axial center of the trunk of the casing (31).
  • the drive shaft (35) is rotatably supported by each bearing of the compression mechanism (40).
  • the drive shaft (35) has a main shaft (36) coaxial with the electric motor (32), and a crank shaft (37) eccentric from the main shaft (36).
  • the outer diameter of the crankshaft (37) is larger than the outer diameter of the main shaft (36).
  • An oil pump (38) that pumps up oil accumulated at the bottom of the casing (31) is provided below the drive shaft (35). The oil pumped up by the oil pump (38) is supplied to each sliding portion of the bearing and the compression mechanism (40) through a flow path (not shown) inside the drive shaft (35).
  • the compression mechanism (40) is arranged below the electric motor (32).
  • the compression mechanism (40) has a front head (41), a cylinder (42), a rear head (43), and a piston (44).
  • the cylinder (42) is formed in a flat cylindrical shape. The opening at the upper end of the cylinder (42) is closed by the front head (41), and the opening at the lower end of the cylinder (42) is closed by the rear head (43). Thereby, a cylindrical cylinder chamber (45) is defined inside the cylinder (42).
  • An annular piston (44) is accommodated in the cylinder chamber (45).
  • the piston (44) is fitted into the crankshaft (37). Therefore, when the drive shaft (35) is rotationally driven by the electric motor (32), the piston (44) rotates eccentrically in the cylinder chamber (45).
  • a suction pipe (23) is connected to the suction port (46).
  • the front head (41) is formed with a discharge port (47) communicating with the cylinder chamber (strictly speaking, the high pressure chamber (H)).
  • the discharge port (47) is provided with a discharge valve (not shown) such as a reed valve.
  • a muffler (48) covering the front head (41) is attached to the upper part of the compression mechanism (40).
  • a muffler space (49) communicating with the discharge port (47) is formed inside the muffler (48). In the muffler space (49), noise caused by refrigerant discharge pulsation is reduced.
  • the air conditioner (10) includes a controller (90) for controlling each component device. Details of the controller (90) will be described later.
  • the compression mechanism (40) is configured as a swinging piston type having a blade (51) and a bush (52).
  • the cylinder (42) is formed with a bush groove (53) and a back pressure chamber (54).
  • the bush groove (53) is formed at a position adjacent to the cylinder chamber (45) and communicates with the cylinder chamber (45).
  • the bush groove (53) forms a cylindrical space having a substantially circular cross section.
  • the back pressure chamber (54) is located radially outward of the bush groove (53) in the cylinder (42).
  • the back pressure chamber (54) forms a columnar space having a substantially circular cross section.
  • the back pressure chamber (54) has an end on the cylinder chamber (45) side communicating with the bush groove (53).
  • the back pressure chamber (54) is an atmosphere of a high pressure corresponding to the pressure of the internal space (S) of the casing (31) (that is, the pressure of the refrigerant discharged from the compression mechanism (40)).
  • the oil pumped up by the oil pump (38) is supplied to the back pressure chamber (54).
  • the oil in the back pressure chamber (54) is used to lubricate the sliding part between the inner peripheral surface of the bush groove (53) and the bush (52) and the sliding part of the bush (52) and blade (51). Is done.
  • the pair of bushes (52) has a substantially cross-sectional or semicircular cross section.
  • the pair of bushes (52) is swingably held inside the bush groove (53).
  • the pair of bushes (52) includes an arc portion (52a) facing the bush groove (53) and a flat portion (52b) facing the blade (51).
  • the pair of bushes (52) swings so that the arc portion (52a) is in sliding contact with the bush groove (53) with the center of the bush groove (53) as an axis.
  • the pair of bushes (52) are arranged in the bush grooves (53) so that the flat portions (52b) face each other. Thereby, a blade groove (55) is formed between the flat portions (52b) of the pair of bushes (52).
  • the blade groove (55) has a substantially rectangular cross section, and the blade (51) is held therein so as to be able to advance and retreat in the radial direction.
  • the blade (51) is formed in a rectangular parallelepiped shape or a plate shape extending radially outward.
  • the base end (radially inner end) of the blade (51) is integrally connected to the outer peripheral surface of the piston (44).
  • the piston (44) and the blade (51) may be integrally molded with the same member, or another member may be fixed integrally.
  • the tip (radially outer end) of the blade (51) is located in the back pressure chamber (54).
  • the blade (51) partitions the cylinder chamber (45) into a low pressure chamber (L) and a high pressure chamber (H).
  • the low pressure chamber (L) is a space on the right side of the blade (51) in FIG. 2 and communicates with the suction port (46).
  • the high pressure chamber (H) is a space on the left side of the blade (51) in FIG. 2 and communicates with the discharge port (47).
  • the outer peripheral surface of the piston (44) is in line contact with the inner peripheral surface of the cylinder chamber (45) through the oil film to form a seal portion.
  • the seal portion between the piston (44) and the cylinder (42) is displaced along the inner peripheral surface of the cylinder chamber (45), and the low pressure chamber (L)
  • the volume of the high pressure chamber (H) changes.
  • the blade (51) advances and retreats in the blade groove (55) according to the rotation angle of the piston (44).
  • the pair of bushes (52) swings with the blade (51) about the axis of the bush groove (53).
  • the “rotation angle” here refers to the rotation direction of the drive shaft (35) (the timepiece of FIG. 3) with the position where the piston (44) is closest to the bush groove (53) (so-called top dead center) as the reference 0 °.
  • the angle is expressed in the direction of rotation).
  • the low pressure refrigerant is sucked into the low pressure chamber (L) through the suction pipe (23) and the suction port (46). .
  • the blocked space constitutes the high pressure chamber (H).
  • the internal pressure of the high pressure chamber (H) increases.
  • the discharge stroke is performed.
  • the discharge valve of the discharge port (47) is opened, and the refrigerant in the high pressure chamber (H) flows out of the compression mechanism (40) through the discharge port (47).
  • the refrigerant discharged from the discharge port (47) flows out to the internal space (S) through the muffler space (49).
  • the refrigerant in the internal space (S) flows around the electric motor (32), then flows out of the discharge pipe (22), and is sent to the refrigerant circuit (11).
  • the refrigerant charged in the refrigerant circuit (11) includes a single refrigerant composed of a fluorinated hydrocarbon having the property of causing a disproportionation reaction, or a fluorinated hydrocarbon having a property of causing a disproportionation reaction, and the others.
  • a mixed refrigerant comprising at least one kind of refrigerant can be used.
  • Fluorohydrocarbons having the property of causing a disproportionation reaction include hydrofluoroolefins that have a carbon-carbon double bond that has little impact on the ozone layer and global warming and is easily decomposed by OH radicals ( HFO) can be used.
  • HFO OH radicals
  • HFO refrigerants other than HFO-1123 3,3,3-trifluoropropene (HFO-1243zf), 1,3,3,3-tetrafluoro described in JP-A No.
  • HFO-1234ze Propene (HFO-1234ze), 2-fluoropropene (HFO-1261yf), 2,3,3,3-tetrafluoropropene (HFO-1234yf), 1,1,2-trifluoropropene (HFO-1243yc), special 1,2,3,3,3-pentafluoropropene (HFO-1225ye), trans-1,3,3,3-tetrafluoropropene (HFO-1234ze (E) described in Table 2006-512426 )), Cis-1,3,3,3-tetrafluoropropene (HFO-1234ze (Z)), As long as it has a property of causing disproportionation reaction it is applicable to the present invention. Further, as the fluorinated hydrocarbon having the property of causing a disproportionation reaction, an acetylene-based fluorinated hydrocarbon having a carbon-carbon triple bond may be used.
  • HFO-1123 is included.
  • a mixed refrigerant composed of HFO-1123 and HFC-32 can be used.
  • a mixed refrigerant composed of HFO-1123, HFC-32, and HFO-1234yf can also be used.
  • AMOLEA X series registered trademark: manufactured by Asahi Glass Co., Ltd.
  • AMOLEA Y series registered trademark: manufactured by Asahi Glass Co., Ltd.
  • HFO-1123 hydrocarbon (HC), hydrofluorocarbon (HFC), hydrochlorofluoroolefin (HCFO), chlorofluoroolefin (CFO), etc.
  • HFO-1123 hydrocarbon
  • HFC hydrofluorocarbon
  • HCFO hydrochlorofluoroolefin
  • CFO chlorofluoroolefin
  • HFC is a component that improves performance and has little impact on the ozone layer and global warming. It is preferable to use HFC having 5 or less carbon atoms.
  • difluoromethane HFC-32
  • difluoroethane HFC-152a
  • trifluoroethane HFC-143
  • tetrafluoroethane HFC-134
  • pentafluoroethane HFC-125
  • Pentafluoropropane HFC-245ca
  • HFC-236fa heptafluoropropane
  • HFC-227ea pentafluorobutane
  • HFCP heptafluorocyclopentane
  • HFC-32 difluoromethane
  • HFC-152a 1,1-difluoroethane
  • 1,1,2,2-tetrafluoroethane are less affected by both the ozone layer and global warming.
  • HFC-134 1,1,1,2-tetrafluoroethane
  • HFC-125 pentafluoroethane
  • HCFO is a compound that has a carbon-carbon double bond, has a high proportion of halogen in the molecule, and has reduced combustibility.
  • HCFO includes 1-chloro-2,3,3,3-tetrafluoropropene (HCFO-1224yd), 1-chloro-2,2-difluoroethylene (HCFO-1122), 1,2-dichlorofluoroethylene (HCFO). -1121), 1-chloro-2-fluoroethylene (HCFO-1131), 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf) and 1-chloro-3,3,3-trifluoropropene (HCFO-1233zd) can be used.
  • HCFO-1224yd having particularly excellent performance is preferable, and HCFO-1233zd is preferable because it has excellent high critical temperature, durability, and coefficient of performance.
  • HCFOs other than HCFO-1224yd may be used alone or in combination of two or more.
  • the controller (90) shown in FIG. 1 includes a printed circuit board on which a central processing unit (CPU) and a memory are mounted. Based on the operation switching command and the detection signal of each sensor, the controller (90) is connected to the compressor (30), the expansion valve (17), the four-way switching valve (19), the outdoor fan (20), and the indoor fan (21 ) Etc.
  • CPU central processing unit
  • the controller (90) is connected to the compressor (30), the expansion valve (17), the four-way switching valve (19), the outdoor fan (20), and the indoor fan (21 ) Etc.
  • the controller (90) of the present embodiment includes a coil temperature estimation unit (92) and a high voltage control unit (93) (control unit).
  • the coil temperature estimation unit (92) constitutes a coil temperature detection unit that detects the surface temperature (coil temperature Tm) of the coil (33a) of the electric motor (32).
  • the coil temperature estimation unit (92) of the present embodiment estimates the coil temperature Tm based on the resistance value of the coil (33a) of the electric motor (32).
  • the high pressure control unit (93) performs control so that the coil temperature Tm estimated by the coil temperature estimation unit (92) is equal to or lower than a predetermined temperature (upper limit temperature Ts).
  • controller (90) of the present embodiment performs the following control in order to keep the coil temperature Tm below the upper limit temperature Ts.
  • the coil temperature estimation unit (92) appropriately determines the coil temperature Tm of the electric motor (32).
  • the coil temperature Tm is calculated based on, for example, the following equations (1) and (2).
  • Tm T 0 + ⁇ T (1)
  • ⁇ T ((R / R 0 ) ⁇ 1) ⁇ ( ⁇ + T 0 ) (2)
  • T 0 is the coil temperature of the motor at the time of stop
  • ⁇ T is the increase in the coil temperature accompanying the operation
  • R 0 is the resistance value of the coil of the motor at the time of stop
  • R is the resistance value of the coil at the time of operation
  • It is the temperature coefficient of the coil.
  • the resistance value R of the coil (33a) of the electric motor (32) can be estimated using the operating state (for example, current value, voltage value, etc.) of the electric motor (32).
  • an error may occur in the calculation result due to the influence of the ambient temperature of the compressor (30), the structure of the electric motor (32), the shape of the electric motor (32), and the like.
  • the correlation between the resistance value R and the coil temperature Tm corresponding to such an error factor may be stored in a database such as a map in advance. By appropriately referring to this database, the estimation accuracy of the coil temperature Tm can be improved.
  • the high pressure controller (93) controls the high pressure of the refrigerant circuit (11) so that the coil temperature Tm estimated by the coil temperature estimator (92) is equal to or lower than the upper limit temperature Ts. Thereby, the temperature of the refrigerant discharged from the compression mechanism (40) can be suppressed to the upper limit temperature Ts or less. As a result, it is possible to prevent the refrigerant from causing a disproportionation reaction inside the compressor (30).
  • control is performed so that the coil temperature is equal to or lower than the predetermined temperature Ts, so that it is possible to prevent the refrigerant passing around the electric motor (32) from exceeding the upper limit temperature Ts.
  • the disproportionation reaction of the high-pressure refrigerant can be reliably prevented.
  • the coil temperature detection unit includes a coil temperature sensor (70).
  • a coil temperature sensor (70) is provided in the location which contacts the coil (33a) of an electric motor (32).
  • a coil temperature sensor (70) is arrange
  • the coil temperature sensor (70) may be arranged in the upstream portion of the refrigerant flow in the electric motor (32), or may be arranged in the middle portion of the refrigerant flow in the electric motor (32).
  • the refrigeration apparatus of the above embodiment is an air conditioner (10) that performs indoor cooling and heating.
  • the refrigeration apparatus may be any apparatus as long as it has a refrigerant circuit and performs a refrigeration cycle.
  • the compressor (30) of the above embodiment is a swinging piston type, but the present invention can be applied to various types of compressors such as a rotary type, a scroll type, and a screw type.
  • a temperature sensor is disposed in the refrigerant flow path from the fixed scroll to the discharge pipe or the chamber chamber, and the temperature of the refrigerant discharged from the compression mechanism or the temperature of the refrigerant immediately after being discharged is determined. Can be detected.
  • the compression mechanism (40) may be a so-called two-cylinder type in which the refrigerant is compressed by a plurality of compression units, or a multi-stage type in which a plurality of compression units are connected in series to compress the refrigerant in multiple stages.
  • the present invention is useful for a refrigeration apparatus.
  • Air conditioning equipment (refrigeration equipment) DESCRIPTION OF SYMBOLS 11 Refrigerant circuit 22 Discharge pipe 30 Compressor 31 Casing 32 Electric motor 40 Compression mechanism 70 Coil temperature sensor (coil temperature detection part) 92 Coil temperature estimation unit (coil temperature detection unit) 93 High-pressure control unit (control unit)

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

Dans le dispositif de réfrigération de la présente invention, un fluide frigorigène comprenant un hydrofluorocarbone ayant la caractéristique de provoquer des réactions de dismutation est utilisé. Le dispositif de réfrigération comprend: des unités de détection de température de bobine (70, 92) qui détectent la température de bobine dans un moteur électrique (32); et une unité de commande (93) qui commande la température de bobine détectée par les unités de détection de température de bobine (70, 92) de façon à ne pas dépasser une température prescrite Ts.
PCT/JP2018/001220 2017-01-30 2018-01-17 Dispositif de réfrigération Ceased WO2018139316A1 (fr)

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JP2017014114A JP2018123976A (ja) 2017-01-30 2017-01-30 冷凍装置
JP2017-014114 2017-06-30

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0544679A (ja) * 1991-08-19 1993-02-23 Mitsubishi Heavy Ind Ltd 密閉型ロータリ圧縮機
JPH0840053A (ja) * 1994-08-04 1996-02-13 Matsushita Electric Ind Co Ltd 電動圧縮機の保護方法及びそれを有する装置
JP2001280258A (ja) * 2000-03-31 2001-10-10 Seiko Instruments Inc 冷凍システム制御装置及び方法
JP2015218909A (ja) * 2014-05-14 2015-12-07 パナソニックＩｐマネジメント株式会社 冷凍サイクル装置およびそれを備えた温水生成装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0544679A (ja) * 1991-08-19 1993-02-23 Mitsubishi Heavy Ind Ltd 密閉型ロータリ圧縮機
JPH0840053A (ja) * 1994-08-04 1996-02-13 Matsushita Electric Ind Co Ltd 電動圧縮機の保護方法及びそれを有する装置
JP2001280258A (ja) * 2000-03-31 2001-10-10 Seiko Instruments Inc 冷凍システム制御装置及び方法
JP2015218909A (ja) * 2014-05-14 2015-12-07 パナソニックＩｐマネジメント株式会社 冷凍サイクル装置およびそれを備えた温水生成装置

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