WO2013065233A1 - Refrigeration cycle apparatus and air conditioner provided with same - Google Patents
Refrigeration cycle apparatus and air conditioner provided with same Download PDFInfo
- Publication number
- WO2013065233A1 WO2013065233A1 PCT/JP2012/006299 JP2012006299W WO2013065233A1 WO 2013065233 A1 WO2013065233 A1 WO 2013065233A1 JP 2012006299 W JP2012006299 W JP 2012006299W WO 2013065233 A1 WO2013065233 A1 WO 2013065233A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat exchanger
- compressor
- refrigerant
- way valve
- pipe
- Prior art date
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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
-
- 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
- F25B13/00—Compression machines, plants or systems, with 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/021—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit
- F25B2313/0211—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit the auxiliary heat exchanger being only used during defrosting
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02731—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one three-way valve
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/24—Storage receiver heat
-
- 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
- F25B31/006—Cooling of compressor or motor
Definitions
- the present invention relates to a refrigeration cycle apparatus having a mechanism for switching between a path for directly flowing a refrigerant in which frost attached to an evaporator is melted to a compressor and a path for flowing the refrigerant to an compressor through an auxiliary heat exchanger for heating the refrigerant, and It relates to air conditioners.
- a heat pump air conditioner performs defrosting by switching a four-way valve from a heating cycle to a cooling cycle when the outdoor heat exchanger is frosted during heating operation.
- this defrosting method although the indoor fan is stopped, there is a disadvantage that a feeling of heating is lost because cold air is gradually discharged from the indoor unit.
- FIG. 6 shows an example of a conventional refrigeration cycle apparatus disclosed in Patent Document 1.
- the compressor 100, the four-way valve 102, the outdoor heat exchanger 104, the capillary tube 106, and the indoor unit are provided in the outdoor unit.
- the indoor heat exchanger 108 is connected by a refrigerant pipe, one end is connected to the first bypass circuit 110 that bypasses the capillary tube 106, and the discharge side pipe of the compressor 100, and the other end is connected to the outdoor side from the capillary tube 106.
- a second bypass circuit 112 connected to the pipe leading to the heat exchanger 104 is provided.
- the first bypass circuit 110 is provided with a two-way valve 114, a check valve 116, and a heat storage heat exchanger 118, and the second bypass circuit 112 is provided with a two-way valve 120 and a check valve 122.
- a heat storage tank 124 is provided around the compressor 100, and the heat storage tank 124 is filled with a latent heat storage material 126 for exchanging heat with the heat storage heat exchanger 118.
- the two two-way valves 114 and 120 are controlled to open, a part of the refrigerant discharged from the compressor 100 flows to the second bypass circuit 112, and the remaining refrigerant is four-way. It flows to the valve 102 and the indoor heat exchanger 108. Further, after the refrigerant flowing through the indoor heat exchanger 108 is used for heating, a small amount of refrigerant flows through the capillary tube 106 to the outdoor heat exchanger 104. On the other hand, most of the remaining refrigerant flows into the first bypass circuit 110, flows through the two-way valve 114 to the heat storage heat exchanger 118, takes heat away from the heat storage material 126, and passes through the check valve 116.
- the refrigerant passes through the capillary tube 106 and flows to the outdoor heat exchanger 104. After that, it merges with the refrigerant flowing through the second bypass circuit 112 at the inlet of the outdoor heat exchanger 104, performs defrosting using the heat of the refrigerant, passes through the four-way valve 102, and then enters the compressor 100. Inhaled.
- the hot gas discharged from the compressor 100 during defrosting is guided to the outdoor heat exchanger 104 and the pressure of the refrigerant flowing into the outdoor heat exchanger 104
- the defrosting ability is improved by keeping high.
- FIG. 7 shows a configuration of a conventional air conditioner in Patent Document 2, and this air conditioner is composed of an outdoor unit 2 and an indoor unit 4 connected to each other by refrigerant piping.
- a compressor 6, a four-way valve 8, a strainer 10, an expansion valve 12, and an outdoor heat exchanger 14 are provided inside the outdoor unit 2.
- an indoor heat exchanger 16 is provided inside the indoor unit 4, which are connected to each other via a refrigerant pipe to constitute a refrigeration cycle.
- the compressor 6 and the indoor heat exchanger 16 are connected via a first pipe 18 provided with a four-way valve 8, and the indoor heat exchanger 16 and the expansion valve 12 are second pipe provided with a strainer 10. 20 is connected.
- the expansion valve 12 and the outdoor heat exchanger 14 are connected via a third pipe 22, and the outdoor heat exchanger 14 and the compressor 6 are connected via a fourth pipe 24.
- a four-way valve 8 is disposed in the middle of the fourth pipe 24, and an accumulator 26 for separating the liquid-phase refrigerant and the gas-phase refrigerant is provided in the fourth pipe 24 on the refrigerant suction side of the compressor 6. ing.
- the compressor 6 and the third pipe 22 are connected via a fifth pipe 28, and the first solenoid valve 30 is provided in the fifth pipe 28.
- the fifth pipe 28 and the first electromagnetic valve 30 constitute a discharge gas bypass mechanism.
- a heat storage tank 32 is provided around the compressor 6, and a heat storage heat exchanger 34 is provided inside the heat storage tank 32 and is filled with a heat storage material 36 for exchanging heat with the heat storage heat exchanger 34.
- the heat storage tank 32, the heat storage heat exchanger 34, and the heat storage material 36 constitute a heat storage device that serves as an auxiliary heat exchanger.
- the second pipe 20 and the heat storage heat exchanger 34 are connected via a sixth pipe 38, and the heat storage heat exchanger 34 and the fourth pipe 24 are connected via a seventh pipe 40.
- the pipe 38 is provided with a second electromagnetic valve 31.
- An indoor heat exchanger 16 is provided inside the indoor unit 4, and the indoor heat exchanger 16 exchanges indoor heat with indoor air sucked into the indoor unit 4 by a blower fan (not shown). Heat exchange with the refrigerant flowing in the interior of the vessel 16 is performed, and air heated by heat exchange is blown into the room during heating, while air cooled by heat exchange is blown into the room during cooling.
- the refrigerant discharged from the discharge port of the compressor 6 passes from the four-way valve 8 to the indoor heat exchanger 16 through the first pipe 18.
- the refrigerant condensed by exchanging heat with the indoor air in the indoor heat exchanger 16 passes through the second pipe 20 through the indoor heat exchanger 16, expands through the strainer 10 that prevents foreign matter from entering the expansion valve 12.
- To valve 12. The refrigerant decompressed by the expansion valve 12 reaches the outdoor heat exchanger 14 through the third pipe 22, and the refrigerant evaporated by exchanging heat with the outdoor air in the outdoor heat exchanger 14 is the fourth pipe 24 and the four-way valve 8. And returns to the suction port of the compressor 6 through the accumulator 26.
- the fifth pipe 28 branched from the compressor 6 discharge port of the first pipe 18 and the four-way valve 8 is connected to the expansion valve 12 of the third pipe 22 and the outdoor heat exchanger 14 via the first electromagnetic valve 30.
- the heat storage tank 32 that is joined in between and accommodates the heat storage material 36 and the heat storage heat exchanger 34 is arranged so as to be in contact with and surround the compressor 6, and heat generated in the compressor 6 is supplied to the heat storage material 36. Accumulated.
- the first solenoid valve 30 and the second solenoid valve 31 are closed and no refrigerant flows through the refrigerant circuit.
- the first solenoid valve 30 and the second solenoid valve 31 are controlled to open, and in addition to the refrigerant flow during the normal heating operation described above, the first solenoid valve 30 and the second solenoid valve 31 are discharged from the discharge port of the compressor 6. After a part of the vapor-phase refrigerant passes through the fifth pipe 28 and the first electromagnetic valve 30 and merges with the refrigerant passing through the third pipe 22, the outdoor heat exchanger 14 is heated, condensed, and converted into a liquid phase. Through the fourth pipe 24, the four-way valve 8 and the accumulator 26 are returned to the suction port of the compressor 6.
- a part of the liquid-phase refrigerant that is divided between the indoor heat exchanger 16 and the strainer 10 in the second pipe 20 passes through the sixth pipe 38 and the second electromagnetic valve 31, and then is stored in the heat storage material 36 in the heat storage heat exchanger 34. From the accumulator 26 and returns to the suction port of the compressor 6 through the seventh pipe 40 and the refrigerant that passes through the fourth pipe 24.
- the temperature of the outdoor heat exchanger 14 that has become below freezing due to the attachment of frost at the start of defrosting and heating is heated by the gas-phase refrigerant discharged from the discharge port of the compressor 6, and the frost is melted near zero degrees.
- the temperature of the outdoor heat exchanger 14 begins to rise again.
- a temperature sensor not shown
- the structure is guided to the outdoor heat exchanger via the heat storage tank, or after the refrigerant flows through the outdoor heat exchanger, the outdoor heat exchanger and
- the temperature of the refrigerant flowing through the heat storage tank becomes high, heat absorption from the heat storage tank is not sufficient, and if it is attempted to secure the capacity of the indoor unit, it takes time to defrost. There was a problem of having.
- An object of the present invention is to solve the above-described conventional problems, and to provide an air conditioner that can shorten the defrosting time and further includes the refrigeration cycle device to improve comfort during heating operation.
- the present invention provides: A compressor, A first heat exchanger connected to the compressor; An expansion valve connected to the first heat exchanger; A second heat exchanger connected to the expansion valve; A four-way valve to which the second heat exchanger and the compressor are connected; An auxiliary heat exchanger for heating the refrigerant disposed around the compressor; Between the suction pipe of the compressor and the four-way valve, a path for flowing the refrigerant directly from the four-way valve to the suction pipe of the compressor, and the refrigerant from the four-way valve to the suction pipe of the compressor through the auxiliary heat exchanger A switching device that enables switching with a flow path; With During the defrosting operation for melting frost adhering to the second heat exchanger, the switching device is controlled so that the refrigerant flowing through the first heat exchanger and the second heat exchanger passes through the four-way valve. Then, it flows through the auxiliary heat exchanger and is led to the suction pipe of the compressor.
- the refrigerant after passing through the first heat exchanger and the second heat exchanger passes through the auxiliary heat exchanger during the defrosting operation. It becomes possible to make a heat exchanger into low temperature. Therefore, by quickly absorbing heat from the heat source, it is possible to shorten the defrosting time, to suppress a decrease in the room temperature of the defrosting operation during the heating operation, and to improve the comfort.
- the block diagram of the air conditioner provided with the refrigeration cycle apparatus which concerns on Embodiment 1 of this invention.
- coolant at the time of normal heating in the air conditioner provided with the same refrigeration cycle apparatus The schematic diagram which shows the flow of the refrigerant
- Refrigeration cycle configuration diagram according to Embodiment 2 of the present invention Control time chart according to Embodiment 2 of the present invention
- the first invention is A compressor, A first heat exchanger connected to the compressor; An expansion valve connected to the first heat exchanger; A second heat exchanger connected to the expansion valve; A four-way valve to which the second heat exchanger and the compressor are connected; An auxiliary heat exchanger for heating the refrigerant disposed around the compressor; Between the suction pipe of the compressor and the four-way valve, a path for flowing the refrigerant directly from the four-way valve to the suction pipe of the compressor, and the refrigerant from the four-way valve to the suction pipe of the compressor through the auxiliary heat exchanger A switching device that enables switching with a flow path; With During the defrosting operation for melting frost adhering to the second heat exchanger, the switching device is controlled so that the refrigerant flowing through the first heat exchanger and the second heat exchanger passes through the four-way valve.
- the refrigeration cycle apparatus is characterized in that it flows through the auxiliary heat exchanger and is led to the suction pipe of the compressor.
- the switching device is a three-way valve.
- a discharge gas bypass mechanism connected between the expansion valve and the second heat exchanger from a discharge pipe of the compressor is provided. It is configured. With this configuration, it is possible to supply the high-temperature refrigerant from the compressor to the second heat exchanger, and the defrosting time can be greatly shortened.
- a heat source of the auxiliary heat exchanger for heating the refrigerant is disposed so as to surround the compressor, and the compression It is a heat storage material that stores the heat generated by the machine.
- the defrosting of a 2nd heat exchanger can be complete
- the auxiliary heat exchanger that performs heat exchange with the heat storage material can be set to a low temperature, so that the maximum amount of heat absorbed from the heat storage material can be increased, and the defrosting time can be shortened.
- the comfort can be improved by suppressing, for example, a decrease in room temperature in the defrosting operation during the heating operation.
- the switching device provided between the four-way valve and the auxiliary heat exchanger and the auxiliary heat exchanger A throttle mechanism for increasing the refrigerant pressure loss is provided between them.
- the refrigerant flowing through the auxiliary heat exchanger can be further lowered in temperature, and the heat absorption rate from the heat source can be improved.
- a temperature sensor that detects a pipe temperature of the second heat exchanger, the compressor, the expansion valve, and the switching
- the apparatus further includes a refrigeration cycle control device electrically connected to the device and the temperature sensor.
- the refrigeration cycle control device switches from normal heating operation to defrosting / heating operation.
- a switching instruction is output. Further, at the time of defrosting / heating operation, the temperature in the second heat exchanger melts frost when the temperature in the second heat exchanger is near zero, and the temperature in the second heat exchanger rises after the frost is melted.
- the refrigeration cycle control device When the sensor detects, it is determined that the defrosting is completed, and the refrigeration cycle control device outputs a switching instruction from the defrosting / heating operation to the normal heating operation. Thereby, the start and completion of defrosting / heating operation can be performed efficiently, and efficient defrosting / heating operation can be performed.
- the refrigeration cycle control apparatus once decreases the operation speed of the compressor after the determination of the completion of the defrosting operation, and the first After the expansion valve opening of the expansion valve is reduced to such an extent that the liquid refrigerant supercooled by the heat exchanger can be held in the pipe of the first heat exchanger, the switching device for the refrigerant path is moved from the four-way valve to the auxiliary heat. It is configured to switch from a path for flowing the refrigerant to the suction pipe of the compressor through the exchanger to a path for flowing the refrigerant directly from the four-way valve to the suction pipe of the compressor.
- the pressure difference at the inlet / outlet of the switching device is kept smaller than the allowable pressure difference of the switching device while suppressing the decline in heating capacity as much as possible, and switching is performed reliably.
- the device can be switched.
- the eighth invention is an air conditioner in which the first heat exchanger of the first to seventh inventions is an indoor heat exchanger and the second heat exchanger is an outdoor heat exchanger.
- the pressure difference at the inlet / outlet of the switching device is kept smaller than the allowable pressure difference of the switching device while suppressing the decline in heating capacity as much as possible. Can be.
- FIG. 1 shows a configuration of an air conditioner including a refrigeration cycle apparatus according to Embodiment 1 of the present invention.
- the air conditioner includes an outdoor unit 2 and an indoor unit 4 that are connected to each other through refrigerant piping. It is configured.
- a compressor 6, a four-way valve 8, a strainer 10, an expansion valve 12, and an outdoor heat exchanger (second heat exchanger) 14 are provided inside the outdoor unit 2.
- An indoor heat exchanger (first heat exchanger) 16 is provided inside the indoor unit 4. These are connected to each other via a refrigerant pipe to constitute a refrigeration cycle.
- the compressor 6 and the indoor heat exchanger 16 are connected via a pipe 18 provided with a four-way valve 8, and the indoor heat exchanger 16 and the expansion valve 12 are connected to a pipe 20 provided with a strainer 10. Connected through.
- the expansion valve 12 and the outdoor heat exchanger 14 are connected via a pipe 22, and the outdoor heat exchanger 14 and the compressor 6 are connected via a pipe 24 and a pipe 25.
- a four-way valve 8 is disposed between the pipe 24 and the pipe 25 connecting the outdoor heat exchanger 14 and the compressor 6.
- a three-way valve (switching device) 42 is connected between the four-way valve 8 and the compressor 6 via a pipe 25.
- the three-way valve 42 and the pipe 25 on the compressor refrigerant suction side are provided with an accumulator 26 for separating the liquid-phase refrigerant and the gas-phase refrigerant.
- the piping 22 connecting the outdoor heat exchanger 14 and the indoor heat exchanger 16 is connected to the compressor 6 via the piping 28, and the piping 28 is provided with an electromagnetic valve 30.
- the pipe 28 and the electromagnetic valve 30 constitute a discharge gas bypass mechanism.
- a heat storage tank 32 is provided around the compressor 6.
- the heat storage tank 32 is provided with a heat storage heat exchanger 34 and filled with a heat storage material (for example, ethylene glycol aqueous solution) 36 for exchanging heat with the heat storage heat exchanger 34.
- a heat storage material for example, ethylene glycol aqueous solution
- the three-way valve 42 and the heat storage heat exchanger 34 are connected via a pipe 38 including a capillary tube (throttle mechanism) 43, and the pipe 25 connecting the three-way valve 42 and the compressor 6 is connected to the heat storage heat via the pipe 40. It is connected to the exchanger 34.
- a blower fan (not shown), upper and lower blades (not shown), and left and right blades (not shown) are provided inside the indoor unit 4.
- the indoor heat exchanger 16 exchanges heat between the indoor air sucked into the indoor unit 4 by the blower fan and the refrigerant flowing inside the indoor heat exchanger 16, and the air heated by the heat exchange during heating is used. While air is blown out, air cooled by heat exchange is blown out into the room during cooling.
- the upper and lower blades change the direction of the air blown from the indoor unit 4 up and down as necessary.
- the left and right blades change the direction of the air blown from the indoor unit 4 to the left and right as necessary.
- the compressor 6, the blower fan, the upper and lower blades, the left and right blades, the four-way valve 8, the expansion valve 12, the electromagnetic valve 30, the three-way valve 42, and the like are electrically connected to a control device (not shown, for example, a microcomputer) for control. It is controlled and operated by the device.
- a control device not shown, for example, a microcomputer
- the refrigerant discharged from the discharge port of the compressor 6 reaches the indoor heat exchanger 16 through the pipe 18 from the four-way valve 8.
- Refrigerant condensed by exchanging heat with indoor air in the indoor heat exchanger 16 exits the indoor heat exchanger 16, passes through the piping 20, passes through the strainer 10 that prevents foreign matter from entering the expansion valve 12, and then expands the expansion valve 12.
- the refrigerant decompressed by the expansion valve 12 reaches the outdoor heat exchanger 14 through the pipe 22.
- the refrigerant evaporated by exchanging heat with the outdoor air in the outdoor heat exchanger 14 passes through the pipe 24, the four-way valve 8, the three-way valve 42, the pipe 25, and the accumulator 26 through the suction port of the compressor 6. Return to 6.
- pipe 28 branched from the discharge port of the compressor 6 of the pipe 18 and the four-way valve 8 is joined between the expansion valve 12 of the pipe 22 and the outdoor heat exchanger 14 via the electromagnetic valve 30.
- the heat storage tank 32 in which the heat storage material 36 and the heat storage heat exchanger 34 are housed is disposed so as to be in contact with and surrounded by the compressor 6, and the heat generated in the compressor 6 is accumulated in the heat storage material 36.
- One side of the three-way valve 42 is connected to the suction pipe of the four-way valve 8, the other side is connected to the three-way valve 42 and the pipe 25 connecting the suction port of the compressor 6, and the other side is connected to the three-way valve 42 and heat storage heat.
- a pipe 38 connected to the exchanger 34 is connected.
- FIG. 2 schematically showing the operation during normal heating of the air conditioner and the flow of the refrigerant.
- the solenoid valve 30 is controlled to be closed, and the refrigerant discharged from the discharge port of the compressor 6 reaches the indoor heat exchanger 16 from the four-way valve 8 through the pipe 18 as described above.
- the refrigerant condensed by exchanging heat with the indoor air in the indoor heat exchanger 16 exits the indoor heat exchanger 16 and passes through the pipe 20 to the expansion valve 12.
- the refrigerant decompressed by the expansion valve 12 reaches the outdoor heat exchanger 14 through the pipe 22.
- the refrigerant evaporated by exchanging heat with the outdoor air in the outdoor heat exchanger 14 reaches the four-way valve 8 through the pipe 24.
- the three-way valve 42 is controlled so that the refrigerant leads from the outdoor heat exchanger 14 to the suction port of the compressor 6, that is, the pipe 24 and the pipe 25 communicate with each other.
- the refrigerant passes through the three-way valve 42 and returns to the suction port of the compressor 6.
- the heat generated in the compressor 6 is stored in the heat storage material 36 housed in the heat storage tank 32 from the outer wall of the compressor 6 through the inner wall of the heat storage tank 32.
- FIG. 3 schematically showing the operation of the air conditioner during defrosting / heating and the flow of refrigerant.
- the solid line arrows indicate the flow of the refrigerant used for heating
- the broken line arrows indicate the flow of the refrigerant used for defrosting.
- the air conditioner according to the present invention is provided with a temperature sensor 51 that detects the piping temperature of the outdoor heat exchanger 14. When the temperature sensor 51 detects that the evaporating temperature has decreased as compared to non-frosting, an instruction to switch from the normal heating operation to the defrosting / heating operation is output from the control device.
- the solenoid valve 30 When switching from the normal heating operation to the defrosting / heating operation, the solenoid valve 30 is controlled to open. In addition to the refrigerant flow during the normal heating operation described above, a part of the gas-phase refrigerant exiting from the discharge port of the compressor 6 passes through the pipe 28 and the electromagnetic valve 30 and merges with the refrigerant passing through the pipe 22 to be outdoors. The heat exchanger 14 is heated and condensed to form a liquid phase, and then the four-way valve 8 is reached.
- the three-way valve 42 is controlled so that the path leading the refrigerant from the outdoor heat exchanger 14 to the heat storage heat exchanger 34, that is, the pipe 24 and the pipe 38 communicate with each other.
- the refrigerant that has passed through the four-way valve 8 is depressurized by the capillary tube 43 and becomes a low temperature, absorbs the heat of the heat storage material 36 by the heat storage heat exchanger 34, reaches the accumulator 26 in the gas phase or in a high quality state, and reaches the compressor 6. Return to the inlet.
- the heat storage heat exchanger 34 that exchanges heat with the heat storage material 36 can be cooled. Since the maximum amount of heat absorbed from the heat storage material 36 is proportional to the temperature difference between the temperature of the compressor 6 and the temperature of the heat storage heat exchanger 34, if the temperature of the heat storage heat exchanger 34 can be lowered, the compressor 6 The temperature difference between the temperature and the temperature of the heat storage heat exchanger 34 can be increased, the maximum amount of heat absorbed from the heat storage material 36 can be increased, the defrosting time can be shortened, and the room temperature by the defrosting operation during the heating operation can be increased. The comfort can be improved by suppressing the decrease.
- the liquid refrigerant in the heat storage heat exchanger 34 since the evaporation of the liquid refrigerant in the heat storage heat exchanger 34 is promoted, the liquid refrigerant does not return to the compressor 6 and the reliability of the compressor 6 can be improved.
- the temperature of the outdoor heat exchanger 14 that has become below freezing due to the attachment of frost at the start of defrosting / heating is the liquid phase or the gas-liquid two-phase returning from the gas-phase refrigerant that exits from the discharge port of the compressor 6 and the indoor heat exchanger 16.
- the frost is melted at around zero degrees, and when the frost is completely melted, it starts rising again.
- the temperature sensor 51 detects the temperature rise of the outdoor heat exchanger 14, it is determined that the defrosting is completed, and an instruction to switch from the defrosting / heating operation to the normal heating operation is output from the control device.
- the discharge gas bypass path from the compressor 6 through the piping 28 through the solenoid valve 30 to the outdoor heat exchanger 14 is not necessarily required, and is configured to be eliminated unless a very large defrosting capacity is required. Also good.
- the gas phase refrigerant flows from the discharge port of the compressor 6 through the pipe 18, the indoor heat exchanger 16, the pipe 20, and the pipe 22 to the outdoor heat exchanger 14, thereby defrosting the outdoor heat exchanger 14.
- the pipe 18, the indoor heat exchanger 16, the pipe 20, and the pipe 22 to the outdoor heat exchanger 14, thereby defrosting the outdoor heat exchanger 14.
- the capillary tube 43 is provided in the pipe 38 extending from the three-way valve 42 to the heat storage heat exchanger 34.
- the opening of the three-way valve 42 communicating with the heat storage heat exchanger 34 is provided. It is good also as the specification which narrowed down. In this case, the capillary tube 43 can be removed, and a compact configuration can be achieved at low cost.
- Embodiment 2 ⁇ Background of obtaining one embodiment of the present invention>
- the air conditioner of Embodiment 1 shown in FIG. 1 has been proposed as an improved version of the conventional air conditioner shown in FIG. 7, and FIG. 1 shows an example of a refrigeration cycle apparatus with an improved defrosting system. Yes.
- a three-way valve 42 serving as a switching device is connected between the four-way valve 8 and the compressor 6 via a pipe 25, and further, the three-way valve 42 and the compressor refrigerant suction.
- the pipe 25 on the side is provided with an accumulator 26 for separating the liquid phase refrigerant and the gas phase refrigerant.
- the three-way valve 42 and the heat storage heat exchanger 34 are connected via a pipe 38 including a capillary tube 43 serving as a throttle mechanism, and the pipe 25 connecting the heat storage heat exchanger 34, the three-way valve 42 and the compressor 6 is It is connected via a pipe 40.
- One side of the three-way valve 42 is connected to the suction pipe of the four-way valve 8, the other side is connected to the three-way valve 42 and the pipe 25 connecting the suction port of the compressor 6, and the other side is connected to the three-way valve 42 and heat storage heat.
- a pipe 38 connected to the exchanger 34 a path for introducing the refrigerant from the four-way valve 8 through the pipe 25 to the suction port of the compressor 6, and a compressor through the heat storage heat exchanger 34 through the pipe 38 from the four-way valve 8. It is possible to switch the path for guiding the refrigerant to the six suction ports.
- the refrigerant discharged from the discharge port of the compressor 6 passes through the pipe 18 and reaches the indoor heat exchanger 16 from the four-way valve 8.
- the refrigerant condensed by exchanging heat with the indoor air in the indoor heat exchanger 16 exits the indoor heat exchanger 16, reaches the expansion valve 12 through the pipe 20, and the refrigerant decompressed by the expansion valve 12 passes through the pipe 22. It passes through to the outdoor heat exchanger 14.
- the refrigerant evaporated by exchanging heat with the outdoor air in the outdoor heat exchanger 14 reaches the four-way valve 8 through the pipe 24.
- the three-way valve 42 is controlled so that the passage of the refrigerant from the outdoor heat exchanger 14 to the suction port of the compressor 6, that is, the pipe 24 and the pipe 25 communicate with each other, and the refrigerant passing through the four-way valve 8 is the three-way valve 42. And return to the suction port of the compressor 6.
- the heat generated in the compressor 6 is accumulated in the heat storage material 36 housed in the heat storage tank 32 from the outer wall of the compressor 6 through the outer wall of the heat storage tank 32.
- a temperature sensor (not shown) for detecting the piping temperature of the outdoor heat exchanger 14 is provided. When the temperature sensor detects that the evaporating temperature has decreased as compared with the time of non-frosting, the control device performs normal heating operation. Outputs an instruction for defrosting / heating operation.
- the three-way valve 42 is controlled so that the refrigerant leads from the outdoor heat exchanger 14 to the heat storage heat exchanger 34, that is, the pipe 24 and the pipe 38 communicate with each other.
- the pressure is reduced by the capillary tube 43 to a low temperature, the heat storage heat exchanger 34 absorbs the heat of the heat storage material 36, reaches the accumulator 26 in the gas phase or in a high dryness state, and returns to the suction port of the compressor 6.
- the temperature of the outdoor heat exchanger 14 that has become below freezing due to the attachment of frost at the start of defrosting / heating is the liquid phase or the gas-liquid two-phase returning from the gas-phase refrigerant that exits from the discharge port of the compressor 6 and the indoor heat exchanger 16.
- the temperature of the outdoor heat exchanger 14 begins to rise again.
- the temperature increase of the outdoor heat exchanger 14 is detected by the temperature sensor, it is determined that the defrosting is completed, and an instruction from the defrosting / heating operation to the normal heating operation is output from the control device. .
- the refrigerant that has flowed through the indoor heat exchanger 16 and the outdoor heat exchanger 14 flows through the heat storage heat exchanger 34 via the four-way valve 8, and is sucked into the compressor 6.
- the indoor heat exchanger 16 is operated at a high temperature and the heat storage heat exchanger 34 is maintained at a low temperature, and the heat absorption from the heat source is quickly performed, thereby reducing the defrosting time and heating operation. It is possible to improve comfort by suppressing a decrease in room temperature during defrosting operation.
- the present inventors set the pressure difference at the inlet / outlet of the three-way valve while suppressing the decrease in the heating capacity as much as possible when switching from the defrosting / heating operation to the normal heating operation.
- FIG. 4 is a refrigeration cycle configuration diagram showing the configuration of the air conditioner including the refrigeration cycle apparatus according to Embodiment 2 of the present invention, and the same components as in Embodiment 1 of the present invention shown in FIG. The same number is attached and detailed explanation is omitted.
- the air conditioner further includes a refrigeration cycle control device 50 that controls the operation thereof.
- the refrigeration cycle control device 50 is electrically connected to the temperature sensor 51 and detects the temperature of the outdoor heat exchanger (first heat exchanger) 14.
- the refrigeration cycle control device 50 is also electrically connected to the compressor 6, the expansion valve 12, and the three-way valve 42 serving as a switching device, so that the operating speed of the compressor 6, the throttle amount of the expansion valve 12, and the refrigerant of the three-way valve 42. Determine path switching and drive control.
- the solenoid valve 30 is controlled to be closed, and the refrigerant discharged from the discharge port of the compressor 6 passes through the pipe 18 and reaches the indoor heat exchanger 16 from the four-way valve 8.
- the refrigerant condensed by exchanging heat with the indoor air in the indoor heat exchanger 16 exits the indoor heat exchanger 16 and passes through the pipe 20 to the expansion valve 12.
- the refrigerant decompressed by the expansion valve 12 passes through the pipe 22 and reaches the outdoor heat exchanger 14.
- the refrigerant evaporated by exchanging heat with the outdoor air in the outdoor heat exchanger 14 reaches the four-way valve 8 through the pipe 24.
- the three-way valve 42 is controlled so that the passage of the refrigerant from the outdoor heat exchanger 14 to the suction port of the compressor 6, that is, the pipe 24 and the pipe 25 communicate with each other, and the refrigerant passing through the four-way valve 8 is the three-way valve 42. And return to the suction port of the compressor 6.
- the heat generated in the compressor 6 is accumulated in the heat storage material 36 accommodated in the heat storage tank 32 from the outer wall of the compressor 6 through the outer wall of the heat storage tank 32 constituting the auxiliary heat exchanger.
- the refrigeration cycle control device 50 When the outdoor heat exchanger 14 is frosted during the above-described normal heating operation and the frosted frost grows, the ventilation resistance of the outdoor heat exchanger 14 increases and the air flow decreases, and the evaporation in the outdoor heat exchanger 14 increases. The temperature drops.
- the temperature sensor 51 detects that the evaporation temperature has decreased as compared with the time of non-frosting, the refrigeration cycle control device 50 outputs a switching instruction from the normal heating operation to the defrosting / heating operation.
- the solenoid valve 30 When switching from the normal heating operation to the defrosting / heating operation, the solenoid valve 30 is controlled to open. In addition to the refrigerant flow during the normal heating operation described above, a part of the gas-phase refrigerant exiting from the discharge port of the compressor 6 passes through the pipe 28 and the electromagnetic valve 30 serving as a discharge gas bypass mechanism, and passes through the pipe 22. , The outdoor heat exchanger 14 is heated, condensed and converted into a liquid phase, and then the four-way valve 8 is reached.
- the three-way valve 42 is controlled so that the path leading the refrigerant from the outdoor heat exchanger 14 to the heat storage heat exchanger 34, that is, the pipe 24 and the pipe 38 communicate with each other.
- the refrigerant that has passed through the four-way valve 8 is depressurized by the capillary tube 43 serving as a throttling mechanism and becomes a low temperature, absorbs the heat of the heat storage material 36 by the heat storage heat exchanger 34, and enters the accumulator 26 in the gas phase or high dryness state. Finally, it returns to the suction port of the compressor 6.
- the temperature of the outdoor heat exchanger 14 that has become below freezing due to the attachment of frost at the start of defrosting / heating is the liquid phase or the gas-liquid two-phase returning from the gas-phase refrigerant that exits from the discharge port of the compressor 6 and the indoor heat exchanger 16.
- the frost is melted at around zero degrees, and when the frost is completely melted, it starts rising again.
- the temperature sensor 51 detects the temperature rise of the outdoor heat exchanger 14, it is determined that the defrosting has been completed, and the refrigeration cycle control device 50 outputs a switching instruction from the defrosting / heating operation to the normal heating operation.
- FIGS. 5 (a) to 5 (f) show control time charts according to Embodiment 2 of the present invention, particularly at the timing of shifting to normal heating from the time when it is determined that the above-described defrosting is completed. Changes in compressor speed, expansion valve opening, three-way valve path state, refrigerant pressure (high and low pressure), and heating capacity are shown with time.
- FIG. 5 (a) is defrosting determination, (b) is the compressor rotation speed, (c) is the expansion valve opening degree, (d) is the three-way valve path state, and (e) is the refrigerant pressure (high and low pressure). ) And (f) show changes in heating capacity.
- a control time chart when the expansion valve opening degree of the expansion valve 12 is not throttled when switching from the defrosting / heating operation to the normal heating will be described.
- Fig.5 (a) it determines with defrosting having been completed at the timing of time T1 and transfering to normal heating operation.
- the time T1 indicates a time when the temperature of the outdoor heat exchanger 14 is equal to or higher than a predetermined temperature.
- the predetermined temperature is a temperature at which the frost attached to the outdoor heat exchanger 14 is melted and the temperature in the outdoor heat exchanger 14 starts to rise. Further, the temperature of the outdoor heat exchanger 14 is detected by the temperature sensor 51.
- time T1 is a temperature at which the frost attached to the outdoor heat exchanger 14 is melted and the temperature in the outdoor heat exchanger 14 starts to rise.
- the refrigeration cycle control device 50 issues an instruction to reduce the rotational speed of the compressor 6, and the rotational speed that is the set value at the end of the defrosting / heating operation. Control is performed so as to gradually decrease from F1 and reach the rotational speed F2 by time T2.
- the time T2 indicates a time point after a predetermined time has elapsed from the time T1.
- the refrigeration cycle control device 50 issues an instruction to switch the three-way valve 42 from the defrosting side to the heating side at the time T2.
- the three-way valve 42 is switched from a path through which refrigerant flows from the four-way valve 8 through the heat storage heat exchanger 34 to the suction pipe of the compressor 6 to a path through which refrigerant flows directly from the four-way valve 8 to the suction pipe of the compressor 6.
- the rotation speed of the compressor 6 is lowered, the pressure on the high pressure side of the refrigerant pressure is lowered, and the pressure on the low pressure side is raised.
- the high-low pressure difference ⁇ P between the high-pressure side and the low-pressure side of the refrigerant pressure at time T2 is smaller than the high-low pressure difference at time T1.
- the inlet / outlet pressure of the three-way valve 42 can be smaller than the allowable pressure difference of the three-way valve 42 at time T2, the three-way valve 42 can be switched reliably.
- FIG. 5 (f) there is a problem that the temperature of the indoor heat exchanger 16 is lowered and the heating capacity is lowered due to a decrease in the pressure on the high pressure side of the refrigerant pressure (indicated by a broken line in the figure). .
- the above problem is solved by controlling the expansion valve opening of the expansion valve 12 to be reduced.
- a control time chart when the expansion valve opening degree of the expansion valve 12 is throttled when switching from the defrosting / heating operation to the normal heating will be described.
- Embodiment 2 of the present invention as shown in FIG. 5 (a), it is determined that the defrosting is completed at the timing of time T1 and the routine is shifted to the normal heating operation.
- the refrigeration cycle control device 50 issues an instruction so as to decrease from the rotational speed F ⁇ b> 1 of the compressor 6.
- the refrigeration cycle control device 50 issues an instruction to make the expansion valve opening degree of the expansion valve 12 narrow.
- the expansion valve 12 is gradually throttled from the expansion valve opening P1 that is a set value at the end of the defrosting / heating operation, and is excessively passed by the indoor heat exchanger 16 by time T2.
- the refrigeration cycle control device 50 issues an instruction to switch the three-way valve 42 from the defrosting side to the heating side at the timing of time T2. That is, the three-way valve 42 is switched from a path through which refrigerant flows from the four-way valve 8 through the heat storage heat exchanger 34 to the suction pipe of the compressor 6 to a path through which refrigerant flows directly from the four-way valve 8 to the suction pipe of the compressor 6.
- the high / low pressure difference ⁇ P between the high pressure side and the low pressure side of the refrigerant pressure is larger than when the expansion valve opening degree of the expansion valve 12 is not throttled, but the switching of the three-way valve 42 is If the high / low pressure difference ⁇ P is smaller than the allowable pressure difference of the three-way valve 42, the operation can be performed without any problem.
- the rotation speed of the compressor 6 and the expansion valve opening of the expansion valve 12 are as shown in FIGS. 5 (b) and 5 (c) at time T3.
- control is performed so as to be an initial set value when heating is started.
- the time T3 indicates a point in time when the rotation speed of the compressor 6 and the expansion valve opening of the expansion valve 12 become the initial set values at the time of normal heating activation.
- the rotation speed of the compressor 6 and the expansion valve opening of the expansion valve 12 are controlled so as to be constant at the initial set values at the time of normal heating activation, but depending on the capacity control after a predetermined time has elapsed.
- the set value may be changed.
- the time T3 is higher on the high pressure side of the refrigerant pressure than the time T1, and the heating capacity is increased. ing. This is because after the time T2, in order to increase the heating capacity more quickly, the number of rotations of the compressor 6 is increased and the throttle of the expansion valve 12 is adjusted to increase the difference between the high and low pressures of the refrigerant pressure. is there.
- the pressure difference at the inlet / outlet of the three-way valve 42 is set to the allowable pressure difference of the three-way valve 42 while suppressing a decrease in the heating capacity as much as possible.
- the three-way valve itself can be used at a lower cost with a relatively small allowable pressure difference while keeping the three-way valve 42 to be switched reliably.
- the discharge gas bypass path from the compressor 6 through the piping 28 through the electromagnetic valve 30 to the outdoor heat exchanger (first heat exchanger) is not necessarily required, and a very large defrosting capacity is required. It is good also as a structure which eliminates except the case.
- the heat storage heat exchanger 34 provided so as to surround the compressor 6 as an auxiliary heat exchanger has been described as an example.
- the present invention is not limited to this, and other configurations may be used. It ’s good.
- the refrigeration cycle apparatus not only improves the heat absorption capability from the heat source and improves the defrosting capability, but also reduces the return of the liquid refrigerant to the compressor as much as possible and improves the reliability of the compressor. Can do. Moreover, since a low-cost refrigerant path switching device can be adopted while reducing the decrease in heating capacity during defrosting as much as possible, it is useful for air conditioners, refrigerators, heat pump water heaters, and the like.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
圧縮機と、
前記圧縮機に接続された第1熱交換器と、
前記第1熱交換器と接続された膨張弁と、
前記膨張弁と接続された第2熱交換器と、
前記第2熱交換器と前記圧縮機とが接続された四方弁と、
前記圧縮機の周囲に配置された冷媒加熱用の補助熱交換器と、
前記圧縮機の吸入管と前記四方弁の間に、前記四方弁から前記圧縮機の吸入管へ直接冷媒を流す経路と前記四方弁から前記補助熱交換器を通じて前記圧縮機の吸入管へ冷媒を流す経路との切り替えを可能とする切り替え装置と、
を備え、
前記第2熱交換器に付着した霜を融解する除霜運転時には、前記切り替え装置を制御して、前記第1熱交換器と前記第2熱交換器を流れた冷媒が、前記四方弁を介して前記補助熱交換器を流れ、前記圧縮機の吸入管へ導かれるようにしたものである。 In order to achieve the above object, the present invention provides:
A compressor,
A first heat exchanger connected to the compressor;
An expansion valve connected to the first heat exchanger;
A second heat exchanger connected to the expansion valve;
A four-way valve to which the second heat exchanger and the compressor are connected;
An auxiliary heat exchanger for heating the refrigerant disposed around the compressor;
Between the suction pipe of the compressor and the four-way valve, a path for flowing the refrigerant directly from the four-way valve to the suction pipe of the compressor, and the refrigerant from the four-way valve to the suction pipe of the compressor through the auxiliary heat exchanger A switching device that enables switching with a flow path;
With
During the defrosting operation for melting frost adhering to the second heat exchanger, the switching device is controlled so that the refrigerant flowing through the first heat exchanger and the second heat exchanger passes through the four-way valve. Then, it flows through the auxiliary heat exchanger and is led to the suction pipe of the compressor.
圧縮機と、
前記圧縮機に接続された第1熱交換器と、
前記第1熱交換器と接続された膨張弁と、
前記膨張弁と接続された第2熱交換器と、
前記第2熱交換器と前記圧縮機とが接続された四方弁と、
前記圧縮機の周囲に配置された冷媒加熱用の補助熱交換器と、
前記圧縮機の吸入管と前記四方弁の間に、前記四方弁から前記圧縮機の吸入管へ直接冷媒を流す経路と前記四方弁から前記補助熱交換器を通じて前記圧縮機の吸入管へ冷媒を流す経路との切り替えを可能とする切り替え装置と、
を備え、
前記第2熱交換器に付着した霜を融解する除霜運転時には、前記切り替え装置を制御して、前記第1熱交換器と前記第2熱交換器を流れた冷媒が、前記四方弁を介して前記補助熱交換器を流れ、前記圧縮機の吸入管へ導かれるようにしたことを特徴とする冷凍サイクル装置である。
これにより、除霜運転時、第1熱交換器と第2熱交換器を通った後の冷媒が補助熱交換器を通る構成としているため、第1熱交換器を高温に、補助熱交換器を低温とすることが可能になり、熱源からの吸熱を速やかに行うことで、除霜時間を短縮し、暖房運転時における除霜運転の室温低下を抑制して快適性を向上させることができる。 The first invention is
A compressor,
A first heat exchanger connected to the compressor;
An expansion valve connected to the first heat exchanger;
A second heat exchanger connected to the expansion valve;
A four-way valve to which the second heat exchanger and the compressor are connected;
An auxiliary heat exchanger for heating the refrigerant disposed around the compressor;
Between the suction pipe of the compressor and the four-way valve, a path for flowing the refrigerant directly from the four-way valve to the suction pipe of the compressor, and the refrigerant from the four-way valve to the suction pipe of the compressor through the auxiliary heat exchanger A switching device that enables switching with a flow path;
With
During the defrosting operation for melting frost adhering to the second heat exchanger, the switching device is controlled so that the refrigerant flowing through the first heat exchanger and the second heat exchanger passes through the four-way valve. The refrigeration cycle apparatus is characterized in that it flows through the auxiliary heat exchanger and is led to the suction pipe of the compressor.
Thereby, since the refrigerant after passing through the first heat exchanger and the second heat exchanger passes through the auxiliary heat exchanger during the defrosting operation, the first heat exchanger is set to a high temperature, and the auxiliary heat exchanger It is possible to reduce the defrosting time by quickly performing the heat absorption from the heat source, and it is possible to improve the comfort by suppressing the decrease in the room temperature of the defrosting operation during the heating operation. .
図1は、本発明の実施の形態1に係る冷凍サイクル装置を備えた空気調和機の構成を示しており、空気調和機は、冷媒配管で互いに接続された室外機2と室内機4とで構成されている。 (Embodiment 1)
FIG. 1 shows a configuration of an air conditioner including a refrigeration cycle apparatus according to Embodiment 1 of the present invention. The air conditioner includes an
<本発明に係る一形態を得るに至った経緯>
図1に示す実施の形態1の空気調和機は、上記図7に示す従来の空気調和機の改良版として提案されており、図1は除霜方式を改良した冷凍サイクル装置の一例を示している。 (Embodiment 2)
<Background of obtaining one embodiment of the present invention>
The air conditioner of Embodiment 1 shown in FIG. 1 has been proposed as an improved version of the conventional air conditioner shown in FIG. 7, and FIG. 1 shows an example of a refrigeration cycle apparatus with an improved defrosting system. Yes.
図5(a)に示すように、時間T1のタイミングで除霜が完了し、通常暖房運転に移行すると判定される。ここで、時間T1とは、室外熱交換器14の温度が所定の温度以上になったときを示す。所定の温度とは、室外熱交換器14に付着した霜が融解して、室外熱交換器14内の温度が上昇し始める温度をいう。また、室外熱交換器14の温度は、温度センサ51で検出される。時間T1になると、図5(b)に示すように、冷凍サイクル制御装置50は、圧縮機6の回転数を下げるように指示を出し、除霜・暖房運転終了時の設定値である回転数F1から徐々に低下させ、時間T2までに回転数F2に至るように制御する。ここで、時間T2とは、時間T1から予め定められた所定時間経過した後の時点を示す。冷凍サイクル制御装置50は、図5(d)に示すように、時間T2のタイミングで三方弁42を除霜側から暖房側へ切り替えるように指示を出す。具体的には、三方弁42を四方弁8から蓄熱熱交換器34を通じて圧縮機6の吸入管へ冷媒を流す経路から四方弁8から圧縮機6の吸入管へ直接冷媒を流す経路に切り替える。上記のように制御すると、図5(e)に示すように、圧縮機6の回転数が低くなり、冷媒圧力の高圧側の圧力が下がって、低圧側の圧力が上がる状態になる。このとき、時間T2における冷媒圧力の高圧側と低圧側の高低圧差ΔPは、時間T1における高低圧差よりも小さくなっている。即ち、時間T2において三方弁42の入口出口圧力が三方弁42の許容圧力差よりも小さくできるため、確実に三方弁42を切り替えることができる。しかし、図5(f)に示すように、冷媒圧力の高圧側の圧力が下がることによって室内熱交換器16の温度が低下して暖房能力が下がるという問題がある(図中、破線で示す)。 First, a control time chart when the expansion valve opening degree of the
As shown to Fig.5 (a), it determines with defrosting having been completed at the timing of time T1 and transfering to normal heating operation. Here, the time T1 indicates a time when the temperature of the
4 室内機
6 圧縮機
8 四方弁
10 ストレーナ
12 膨張弁
14 室外熱交換器(第2熱交換器)
16 室内熱交換器(第1熱交換器)
18、20、22、24、25 配管
26 アキュムレータ
28 配管(吐出ガスバイパス機構)
30 電磁弁(吐出ガスバイパス機構)
31 電磁弁
32 蓄熱槽(補助熱交換器)
34 蓄熱熱交換器(補助熱交換器)
36 蓄熱材(補助熱交換器)
38、40 配管
42 三方弁(切り替え装置)
43 キャピラリチューブ(絞り機構)
50 冷凍サイクル制御装置
51 温度センサ 2 Outdoor unit 4
16 Indoor heat exchanger (first heat exchanger)
18, 20, 22, 24, 25
30 Solenoid valve (Discharge gas bypass mechanism)
31
34 Heat storage heat exchanger (auxiliary heat exchanger)
36 Heat storage material (auxiliary heat exchanger)
38, 40
43 Capillary tube (throttle mechanism)
50 Refrigeration
Claims (8)
- 圧縮機と、
前記圧縮機に接続された第1熱交換器と、
前記第1熱交換器と接続された膨張弁と、
前記膨張弁と接続された第2熱交換器と、
前記第2熱交換器と前記圧縮機とが接続された四方弁と、
前記圧縮機の周囲に配置された冷媒加熱用の補助熱交換器と、
前記圧縮機の吸入管と前記四方弁の間に、前記四方弁から前記圧縮機の吸入管へ直接冷媒を流す経路と前記四方弁から前記補助熱交換器を通じて前記圧縮機の吸入管へ冷媒を流す経路との切り替えを可能とする切り替え装置と、
を備え、
前記第2熱交換器に付着した霜を融解する除霜運転時には、前記切り替え装置を制御して、前記第1熱交換器と前記第2熱交換器を流れた冷媒が、前記四方弁を介して前記補助熱交換器を流れ、前記圧縮機の吸入管へ導かれるようにしたことを特徴とする冷凍サイクル装置。 A compressor,
A first heat exchanger connected to the compressor;
An expansion valve connected to the first heat exchanger;
A second heat exchanger connected to the expansion valve;
A four-way valve to which the second heat exchanger and the compressor are connected;
An auxiliary heat exchanger for heating the refrigerant disposed around the compressor;
Between the suction pipe of the compressor and the four-way valve, a path for flowing the refrigerant directly from the four-way valve to the suction pipe of the compressor, and the refrigerant from the four-way valve to the suction pipe of the compressor through the auxiliary heat exchanger A switching device that enables switching with a flow path;
With
During the defrosting operation for melting frost adhering to the second heat exchanger, the switching device is controlled so that the refrigerant flowing through the first heat exchanger and the second heat exchanger passes through the four-way valve. The refrigeration cycle apparatus is characterized in that it flows through the auxiliary heat exchanger and is led to the suction pipe of the compressor. - 前記切り替え装置に三方弁を用いたことを特徴とする請求項1に記載の冷凍サイクル装置。 The refrigeration cycle apparatus according to claim 1, wherein a three-way valve is used for the switching device.
- 前記圧縮機の吐出管から前記膨張弁と第2熱交換器の間に接続される吐出ガスバイパス機構を有する請求項1または2に記載の冷凍サイクル装置。 The refrigeration cycle apparatus according to claim 1 or 2, further comprising a discharge gas bypass mechanism connected between the expansion valve and the second heat exchanger from a discharge pipe of the compressor.
- 前記補助熱交換器の熱源は、前記圧縮機を囲むように配置され、前記圧縮機で発生した熱を蓄熱する蓄熱材であることを特徴とする請求項1乃至3のいずれか一項に記載の冷凍サイクル装置。 4. The heat source of the auxiliary heat exchanger is a heat storage material that is disposed so as to surround the compressor and stores heat generated by the compressor. 5. Refrigeration cycle equipment.
- 前記四方弁から前記補助熱交換器の間に設けられた前記切り替え装置と前記補助熱交換器との間に冷媒圧力損失を増大させる絞り機構を設けたことを特徴とする請求項1乃至4のいずれか一項に記載の冷凍サイクル装置。 The throttle mechanism for increasing refrigerant pressure loss is provided between the switching device provided between the four-way valve and the auxiliary heat exchanger and the auxiliary heat exchanger. The refrigeration cycle apparatus according to any one of the above.
- 前記第2熱交換器の配管温度を検出する温度センサと、
前記圧縮機と前記膨張弁と前記切り替え装置と前記温度センサと電気的に接続される冷凍サイクル制御装置と、
を更に備え、
通常暖房運転時、前記第2熱交換器内の温度が非着霜時に比べて低下したことを前記温度センサが検出すると、前記冷凍サイクル制御装置は、通常暖房運転から除霜・暖房運転への切り替え指示を出力し、
除霜・暖房運転時、前記第2熱交換器内の温度が零度付近で霜を融解し、霜の融解が終わって、前記第2熱交換器内の温度が上昇したことを前記温度センサが検出すると、除霜が完了したと判断し、前記冷凍サイクル制御装置は、除霜・暖房運転から通常暖房運転への切り替え指示を出力する請求項1乃至5のいずれか一項に記載の冷凍サイクル装置。 A temperature sensor for detecting a pipe temperature of the second heat exchanger;
A refrigeration cycle control device electrically connected to the compressor, the expansion valve, the switching device, and the temperature sensor;
Further comprising
When the temperature sensor detects that the temperature in the second heat exchanger is lower than that during non-frosting during normal heating operation, the refrigeration cycle control device switches from normal heating operation to defrosting / heating operation. Output a switching instruction,
During the defrosting / heating operation, the temperature sensor indicates that the temperature in the second heat exchanger has melted when the temperature in the second heat exchanger is near zero, the frost has been melted, and the temperature in the second heat exchanger has increased. If it detects, it will judge that defrosting was completed and the said refrigeration cycle control apparatus will output the switching instruction | indication from defrost / heating operation to normal heating operation, The refrigeration cycle as described in any one of Claims 1 thru | or 5 apparatus. - 前記冷凍サイクル制御装置は、除霜運転終了の判定をした後に、前記圧縮機の運転速度を一旦低下させるとともに、前記第1熱交換器で過冷却した液冷媒を前記第1熱交換器の管内に保持できる程度に膨張弁の膨張弁開度を絞った後、前記冷媒経路の前記切り替え装置を前記四方弁から前記補助熱交換器を通じて前記圧縮機の吸入管へ冷媒を流す経路から前記四方弁から前記圧縮機の吸入管へ直接冷媒を流す経路に切り替えることを特徴とする請求項6に記載の冷凍サイクル装置。 The refrigeration cycle control device, after determining the completion of the defrosting operation, temporarily reduces the operating speed of the compressor and supplies the liquid refrigerant supercooled by the first heat exchanger in the pipe of the first heat exchanger. After the expansion valve opening degree of the expansion valve is reduced to such an extent that the expansion valve can be held, the four-way valve from the path through which the refrigerant is switched from the four-way valve to the suction pipe of the compressor through the auxiliary heat exchanger The refrigeration cycle apparatus according to claim 6, wherein the refrigeration cycle apparatus is switched to a path through which a refrigerant flows directly from a suction pipe to a suction pipe of the compressor.
- 前記第1熱交換器を室内熱交換器、前記第2熱交換器を室外熱交換器とした請求項1乃至7のいずれか一項に記載の空気調和機。 The air conditioner according to any one of claims 1 to 7, wherein the first heat exchanger is an indoor heat exchanger, and the second heat exchanger is an outdoor heat exchanger.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020147005247A KR20140092803A (en) | 2011-11-04 | 2012-10-02 | Refrigeration cycle apparatus and air conditioner provided with same |
CN201280041931.5A CN103765133B (en) | 2011-11-04 | 2012-10-02 | Refrigerating circulatory device and the air conditioner possessing this refrigerating circulatory device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011-241888 | 2011-11-04 | ||
JP2011241888 | 2011-11-04 | ||
JP2011-273135 | 2011-12-14 | ||
JP2011273135 | 2011-12-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013065233A1 true WO2013065233A1 (en) | 2013-05-10 |
Family
ID=48191616
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/006299 WO2013065233A1 (en) | 2011-11-04 | 2012-10-02 | Refrigeration cycle apparatus and air conditioner provided with same |
Country Status (4)
Country | Link |
---|---|
JP (1) | JPWO2013065233A1 (en) |
KR (1) | KR20140092803A (en) |
CN (1) | CN103765133B (en) |
WO (1) | WO2013065233A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109520169A (en) * | 2018-09-11 | 2019-03-26 | 珠海格力电器股份有限公司 | A kind of control method of air conditioner and air conditioner |
CN111503928A (en) * | 2020-05-15 | 2020-08-07 | 珠海格力电器股份有限公司 | Air conditioning unit capable of effectively improving energy utilization rate and control method and device thereof |
EP3663682A4 (en) * | 2017-08-03 | 2021-04-28 | Gree Electric Appliances (Wuhan) Co., Ltd. | Control method for heat pump system and heat pump system |
CN114508891A (en) * | 2020-11-16 | 2022-05-17 | 合肥美的电冰箱有限公司 | Refrigerator refrigerating system and refrigerator defrosting method |
CN115614921A (en) * | 2022-11-01 | 2023-01-17 | 宁波奥克斯电气股份有限公司 | Auxiliary defrosting device, air conditioner, control method and device of air conditioner and storage medium |
JP7398617B2 (en) | 2020-02-17 | 2023-12-15 | パナソニックIpマネジメント株式会社 | air conditioner |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6380455B2 (en) * | 2015-07-14 | 2018-08-29 | 株式会社デンソー | Refrigeration cycle equipment |
JP2020111193A (en) * | 2019-01-11 | 2020-07-27 | サンデン・オートモーティブクライメイトシステム株式会社 | Vehicular air conditioner |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5988655U (en) * | 1982-12-07 | 1984-06-15 | 三菱電機株式会社 | Refrigeration equipment |
JPS6122161A (en) * | 1984-07-06 | 1986-01-30 | 株式会社東芝 | Air conditioner |
JPS6246166A (en) * | 1985-08-21 | 1987-02-28 | 株式会社日立製作所 | Refrostation control method of air conditioner |
JPS63155972U (en) * | 1987-04-01 | 1988-10-13 | ||
JPS63247573A (en) * | 1987-04-03 | 1988-10-14 | 株式会社東芝 | Air conditioner |
JPH0642842A (en) * | 1993-03-11 | 1994-02-18 | Toshiba Corp | Freezing cycle |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5912265A (en) * | 1982-07-13 | 1984-01-21 | 太平洋工業株式会社 | Cooling circuit combining air-conditioning |
JP2894421B2 (en) * | 1993-02-22 | 1999-05-24 | 三菱電機株式会社 | Thermal storage type air conditioner and defrosting method |
-
2012
- 2012-10-02 JP JP2013541597A patent/JPWO2013065233A1/en active Pending
- 2012-10-02 KR KR1020147005247A patent/KR20140092803A/en not_active Application Discontinuation
- 2012-10-02 WO PCT/JP2012/006299 patent/WO2013065233A1/en active Application Filing
- 2012-10-02 CN CN201280041931.5A patent/CN103765133B/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5988655U (en) * | 1982-12-07 | 1984-06-15 | 三菱電機株式会社 | Refrigeration equipment |
JPS6122161A (en) * | 1984-07-06 | 1986-01-30 | 株式会社東芝 | Air conditioner |
JPS6246166A (en) * | 1985-08-21 | 1987-02-28 | 株式会社日立製作所 | Refrostation control method of air conditioner |
JPS63155972U (en) * | 1987-04-01 | 1988-10-13 | ||
JPS63247573A (en) * | 1987-04-03 | 1988-10-14 | 株式会社東芝 | Air conditioner |
JPH0642842A (en) * | 1993-03-11 | 1994-02-18 | Toshiba Corp | Freezing cycle |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3663682A4 (en) * | 2017-08-03 | 2021-04-28 | Gree Electric Appliances (Wuhan) Co., Ltd. | Control method for heat pump system and heat pump system |
US11193704B2 (en) | 2017-08-03 | 2021-12-07 | Gree Electric Appliances (Wuhan) Co., Ltd | Heat pump reversing valve control based on the valve reversing pressure and the system pressure |
CN109520169A (en) * | 2018-09-11 | 2019-03-26 | 珠海格力电器股份有限公司 | A kind of control method of air conditioner and air conditioner |
JP7398617B2 (en) | 2020-02-17 | 2023-12-15 | パナソニックIpマネジメント株式会社 | air conditioner |
CN111503928A (en) * | 2020-05-15 | 2020-08-07 | 珠海格力电器股份有限公司 | Air conditioning unit capable of effectively improving energy utilization rate and control method and device thereof |
CN114508891A (en) * | 2020-11-16 | 2022-05-17 | 合肥美的电冰箱有限公司 | Refrigerator refrigerating system and refrigerator defrosting method |
CN115614921A (en) * | 2022-11-01 | 2023-01-17 | 宁波奥克斯电气股份有限公司 | Auxiliary defrosting device, air conditioner, control method and device of air conditioner and storage medium |
Also Published As
Publication number | Publication date |
---|---|
JPWO2013065233A1 (en) | 2015-04-02 |
CN103765133A (en) | 2014-04-30 |
CN103765133B (en) | 2016-06-29 |
KR20140092803A (en) | 2014-07-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2013065233A1 (en) | Refrigeration cycle apparatus and air conditioner provided with same | |
JP5238001B2 (en) | Refrigeration cycle equipment | |
JP4396771B2 (en) | Refrigeration equipment | |
WO2011093050A1 (en) | Refrigeration cycle apparatus | |
JP2013104623A (en) | Refrigeration cycle device and air conditioner with the same | |
EP3546850B1 (en) | Refrigeration device | |
WO2015045247A1 (en) | Heat pump system, and heat pump water heater | |
WO2012042692A1 (en) | Refrigeration cycle device | |
JP2008096033A (en) | Refrigerating device | |
JP2008082589A (en) | Air conditioner | |
WO2017037771A1 (en) | Refrigeration cycle device | |
JP6057871B2 (en) | Heat pump system and heat pump type water heater | |
JP4666111B1 (en) | Refrigeration cycle equipment | |
CN108361807A (en) | A kind of heat pump system and its control method | |
JP2005214575A (en) | Refrigerator | |
JP2017161159A (en) | Outdoor uni of air conditioner | |
JP2013190906A (en) | Automatic vending machine | |
JP2017101857A (en) | Freezing device | |
JP5927500B2 (en) | Refrigeration cycle apparatus and air conditioner equipped with the same | |
JP2009293887A (en) | Refrigerating device | |
WO2017094594A1 (en) | Refrigeration device | |
JP5927502B2 (en) | Refrigeration cycle apparatus and air conditioner equipped with the same | |
JP2012037130A (en) | Refrigeration cycle device | |
JP2013104586A (en) | Refrigerating cycle device and air conditioner with the same | |
KR101893155B1 (en) | Heat pump |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12845905 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2013541597 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 20147005247 Country of ref document: KR Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 12845905 Country of ref document: EP Kind code of ref document: A1 |