EP2770279A1 - Air conditioner outdoor unit and air conditioner - Google Patents
Air conditioner outdoor unit and air conditioner Download PDFInfo
- Publication number
- EP2770279A1 EP2770279A1 EP14154768.7A EP14154768A EP2770279A1 EP 2770279 A1 EP2770279 A1 EP 2770279A1 EP 14154768 A EP14154768 A EP 14154768A EP 2770279 A1 EP2770279 A1 EP 2770279A1
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- EP
- European Patent Office
- Prior art keywords
- refrigerant
- compressor
- pipe
- way valve
- air conditioner
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- 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.)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/003—General constructional features for cooling refrigerating machinery
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/005—Outdoor unit expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/006—Compression machines, plants or systems with reversible cycle not otherwise provided for two pipes connecting the outdoor side to the indoor side with multiple indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2345/00—Details for charging or discharging refrigerants; Service stations therefor
- F25B2345/006—Details for charging or discharging refrigerants; Service stations therefor characterised by charging or discharging valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Combustion & Propulsion (AREA)
- Other Air-Conditioning Systems (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
Description
- The present disclosure relates to an air conditioner having an outdoor unit and an indoor unit, which are connected to each other through a plurality of refrigerant pipes.
- Conventionally, there is known an air conditioner having an outdoor unit and an indoor unit connected in parallel through a plurality of refrigerant pipes. In this air conditioner, a refrigerant circuit includes devices that are connected to refrigerant pipes by welding, and the refrigerant pipes themselves are also connected together by welding, and the refrigerant pipes are also connected to each other by welding. The refrigerant circuit is filled with a refrigerant.
- The refrigerant circuit is connected to a compressor. The compressor compresses a low-pressure refrigerant suctioned in through a refrigerant suction opening into a high-pressure refrigerant, and discharges the high-pressure refrigerant through a refrigerant discharge opening. In case of failure, the compressor is detached from the refrigerant circuit for replacement. When the compressor is detached from the refrigerant circuit, the refrigerant filled in the refrigerant circuit should be prevented from escaping into the atmosphere. Thus, there is a need of recovering the refrigerant from the refrigerant circuit before the compressor is detached. However, recovering the refrigerant from the refrigerant circuit is a time consuming process. Particularly, for example, a multi-type air conditioner (an air conditioner having a plurality of outdoor units and indoor units) installed in a building or housing complex has long refrigerant pipes and a large amount of refrigerant sealed in the refrigerant circuit. Thus, recovering the refrigerant from the refrigerant circuit is a time consuming process, resulting in poor maintainability of the air conditioner.
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JP-A-7-332784 - An air conditioner outdoor unit includes: a compressor; a heat source-side heat exchanger connected to the compressor; an oil separator disposed between a refrigerant discharge opening of the compressor and the heat source-side heat exchanger configured to separate a refrigerant oil from a refrigerant discharged from the compressor; and a first three-way valve fitted to a refrigerant pipe between the oil separator and the heat source-side heat exchanger.
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FIG. 1 is a diagram illustrating a refrigerant circuit of an air conditioner according to an embodiment of the present disclosure; -
FIG. 2 is a diagram illustrating a refrigerant circuit of an outdoor unit of the air conditioner illustrated inFIG. 1 , illustrating the detaching or attaching of the compressor; and -
FIG. 3 is a diagram illustrating the refrigerant circuit of the outdoor unit of the air conditioner illustrated inFIG. 1 in a case where a first three-way valve fails. - In the following detailed description, for purpose of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing.
- The air conditioner described in Patent Document 1 includes an open/close valve fitted to the discharge pipe. This air conditioner is more likely to cause the following disadvantages than other air conditioners where the open/close valve is not fitted to the discharge pipe. Namely, when the driving of the compressor causes vibration in the discharge pipe, a large force may be applied to the discharge pipe and to a connection part between the discharge pipe and other devices (such as the compressor or an oil separator) due to the weight of the open/close valve. As a result, the discharge pipe and the connection part of the discharge pipe could be damaged. Generally, the discharge pipe of the compressor has a smaller pipe diameter than the intake pipe. Thus, the discharge pipe has a lower strength than the intake pipe. The open/close valves fitted to both the discharge pipe and the intake pipe increases the likelihood of damage to the discharge pipe due to vibrations is increased.
- When the compressor is re-connected to the refrigerant circuit, the necessity may arise to vacuum the refrigerant circuit and perform refrigerant charging. In this case, for example, the amount of the refrigerant corresponds to the amount of refrigerant decreased by escaping into the air when the compressor is detached from or attached to the refrigerant circuit. Here, the term "refrigerant charging" used herein refers to injecting refrigerant into the refrigerant circuit. The air conditioner according to Patent Document 1 is additionally provided with a service valve, a branch pipe, and the like for vacuuming and refrigerant charging. However, such additional components may lead to increased costs and poor maintainability.
- An object of the present disclosure is to provide an air conditioner with high compressor maintenance workability.
- An air outdoor unit according to an embodiment of the present disclosure (the present outdoor unit) includes: a compressor; a heat source-side heat exchanger connected to the compressor; an oil separator disposed between a refrigerant discharge opening of the compressor and the heat source-side heat exchanger configured to separate a refrigerant oil from a refrigerant discharged from the compressor; and a first three-way valve fitted to a refrigerant pipe between the oil separator and the heat source-side heat exchanger.
- The present outdoor unit may further include a flow path switching unit for switching the direction of flow of refrigerant in the heat source-side heat exchanger. The flow path switching unit may be disposed between the heat source-side heat exchanger and the oil separator, and the first three-way valve is disposed on a refrigerant pipe between the flow path switching unit and the oil separator.
- In this case, the present outdoor unit may further include: an oil return pipe with one end connected to the oil separator and the other end connected to a refrigerant pipe connected to a refrigerant intake opening of the compressor; and a second three-way valve disposed between a connection part of the refrigerant pipe and the oil return pipe, and the flow path switching unit.
- Moreover, the first three-way valve may include a first port connected to the oil separator, a second port connected to the flow path switching unit, and a third port which is a service port. In addition, the second three-way valve may include a first port connected to the flow path switching unit, a second port connected to the refrigerant intake opening of the compressor, and a third port which is a service port.
- In addition, an air conditioner according to an embodiment of the present disclosure includes the present outdoor unit, and an indoor unit connected to the outdoor unit.
- In the present outdoor unit, the first three-way valve is disposed on a refrigerant pipe between the flow path switching unit and the oil separator. Thus, the force applied to the discharge pipe and to the connection part between the discharge pipe and the other devices is suppressed even when the discharge pipe is vibrated by the vibration of the compressor. As a result, damage to the discharge pipe and the connection part between the discharge pipe and the other devices is suppressed. Further, when re-attaching the detached compressor onto the refrigerant circuit, vacuuming can be performed through the vacant ports (the ports to which no refrigerant pipe is connected) of the first three-way valve and the second three-way valve. As a result, the cost increase due to separately fitting a service valve and a branch pipe can be suppressed, and high maintainability can be obtained.
- In the following, an embodiment of the present disclosure will be described in detail with reference to the drawings. In an air conditioner according to the present embodiment, three indoor units are parallelly connected to one outdoor unit. The air conditioner can simultaneously perform cooling operation or heating operation in all of the indoor units. It should be noted that the present disclosure is not limited to the following embodiment, and various modifications can be made without departing from the gist of the disclosure.
- As illustrated in
FIG. 1 , an air conditioner 1 according to the present embodiment includes oneoutdoor unit 2 installed outside a building or the like, and threeindoor units 5a to 5c. Theindoor units 5a to 5c are connected to theoutdoor unit 2 in parallel through a liquid pipe (refrigerant pipe) 8 and a gas pipe (refrigerant pipe) 9. Specifically, one end of theliquid pipe 8 is connected to anoperating valve 27 of theoutdoor unit 2. The other end of theliquid pipe 8 is branched and respectively connected toclosing valves 53a to 53c of theindoor units 5a to 5c. One end of thegas pipe 9 is connected to anoperating valve 28 of theoutdoor unit 2. The other end of thegas pipe 9 is branched and connected toclosing valves 54a to 54c of theindoor units 5a to 5c, respectively. Thus, arefrigerant circuit 100 of the air conditioner 1 is formed. - The
outdoor unit 2 will be described. Theoutdoor unit 2 includes acompressor 21, a four-way valve (flow path switching unit) 22, an outdoor heat exchanger (heat source-side heat exchanger) 23, anoil separator 24, anoutdoor expansion valve 25, the operatingvalve 27 to which one end of theliquid pipe 8 is connected, the operatingvalve 28 to which one end of thegas pipe 9 is connected, a first three-way valve 11, a second three-way valve 12, and anoutdoor fan 29. The above members except for theoutdoor fan 29 are mutually connected through refrigerant pipes described below. Thus, an outdoor unitrefrigerant circuit 20 as part of therefrigerant circuit 100 is formed. - The
compressor 21 is driven by a motor (not shown) whose rotational speed is control by an inverter. Namely, thecompressor 21 is a capacity-variable compressor capable of varying operation capacity. A refrigerant discharge side of thecompressor 21 is connected to a refrigerant inflow side of theoil separator 24 through adischarge pipe 41. A refrigerant intake side of thecompressor 21 is connected to the four-way valve 22 (described later) through anintake pipe 42. - The four-
way valve 22 is a valve for switching the direction of flow of refrigerant, and includes four ports a, b, c, and d. The port a is connected to a refrigerant outflow side of theoil separator 24 through anoutflow pipe 43. The port b is connected to one refrigerant entry/exit opening of theoutdoor heat exchanger 23 through arefrigerant pipe 44. The port c is connected to the refrigerant intake side of thecompressor 21 through theintake pipe 42. The port d is connected to the operatingvalve 28 through an outdoorunit gas pipe 46. Thus, the four-way valve 22 is configured to switch the refrigerant flow path between theoutdoor heat exchanger 23, theoil separator 24, thecompressor 21, and the operatingvalve 28. - The four-
way valve 22 switches the direction of refrigerant of theoutdoor heat exchanger 23. As illustrated inFIG. 1 , when the ports a and b of the four-way valve 22 make communication with each other, the refrigerant flows from therefrigerant temperature sensor 35 to therefrigerant temperature sensor 36 through the heat source-side heat exchanger 23 (during cooling operation). On the other hand, the ports b and c of the four-way valve 22 make communication with each other, the refrigerant flows from therefrigerant temperature sensor 36 to therefrigerant temperature sensor 35 through the heat source-side heat exchanger 23 (during heating operation). Thus, the four-way valve 22 serves as a flow path switching unit for switching the direction of flow of the refrigerator in the heat source-side heat exchanger. - The
outdoor heat exchanger 23 carries out heat exchange between the refrigerant and outer air taken into theoutdoor unit 2 by the outdoor fan 29 (as will be described below). The one refrigerant entry/exit opening of theoutdoor heat exchanger 23 is connected to the port b of the four-way valve 22, as described above. The other refrigerant entry/exit opening of theoutdoor heat exchanger 23 is connected to the operatingvalve 27 through an outdoor unitliquid pipe 45. - The
outdoor expansion valve 25 is an electronic expansion valve fitted to the outdoor unitliquid pipe 45. By adjusting the opening degree of theoutdoor expansion valve 25, the amount of refrigerant that flows into theoutdoor heat exchanger 23, or the amount of refrigerant that flows out of theoutdoor heat exchanger 23 can be adjusted. - The
oil separator 24 is fixed on a casing of theoutdoor unit 2 by metal fittings and the like (not shown). As described above, the refrigerant inflow side of theoil separator 24 is connected to the refrigerant discharge opening of thecompressor 21 through thedischarge pipe 41. The refrigerant outflow side of theoil separator 24 is connected to the port a of the four-way valve 22 through theoutflow pipe 43. Theoil separator 24 separates refrigerant oil for thecompressor 21 contained in the refrigerant discharged out of thecompressor 21 from the refrigerant. The separated refrigerant oil is suctioned into thecompressor 21 through an oil return pipe 47 (as will be described below). - The
oil return pipe 47 has an end connected to an oil return opening of theoil separator 24 and the other end connected to theintake pipe 42. Theoil return pipe 47 is provided with acapillary tube 26. - The first three-
way valve 11 is disposed on theoutflow pipe 43. The first three-way valve 11 includes three ports e, f, and g. The port e (a first port of the first three-way valve) is connected to the refrigerant outflow side of theoil separator 24. The port f (a second port of the first three-way valve) is connected to the port a of the four-way valve 22. The port g (a third port of the first three-way valve) is a service port for vacuuming and the like of the refrigerant pipe. The first three-way valve 11 can be switched to make communication at least between the ports e and f, or between the ports e and g. - The second three-
way valve 12 is disposed on theintake pipe 42. More specifically, the second three-way valve 12 is disposed on the four-way valve 22 side with respect to the point of connection of theoil return pipe 47 and theintake pipe 42. The second three-way valve 12 includes three ports h, j, and k. The port h (a first port of the second three-way valve) is connected to the port c of the four-way valve 22. The port j (a second port of the second three-way valve) is connected to the refrigerant intake side of thecompressor 21. The port k (a third port of the second three-way valve) is a service port for vacuuming and the like of the refrigerant pipes. The second three-way valve 12 can be switched to make communication at least between the ports h and j, or between the ports j and k. - The
outdoor fan 29 is formed of a resin material and is disposed in the vicinity of theoutdoor heat exchanger 23. Theoutdoor fan 29 is rotated by the fan motor (not shown). Thus, the outer air is taken into theoutdoor unit 2, and the outer air that exchanges heat with the refrigerant in theoutdoor heat exchanger 23 is released from theoutdoor unit 2. - Other than the configuration described above, the
outdoor unit 2 is provided with various sensors. As illustrated inFIG. 1 , thedischarge pipe 41 is provided with ahigh pressure sensor 31 and adischarge temperature sensor 33. Thehigh pressure sensor 31 detects the pressure of the refrigerant discharged out of thecompressor 21. Thedischarge temperature sensor 33 detects the temperature of the refrigerant discharged out of thecompressor 21. Theintake pipe 42 is provided with a low-pressure sensor 32 and anintake temperature sensor 34 in the vicinity of the refrigerant intake side of thecompressor 21. The low-pressure sensor 32 detects the pressure of the refrigerant suctioned into thecompressor 21. Theintake temperature sensor 34 detects the temperature of the refrigerant suctioned into thecompressor 21. - Between the four-
way valve 22 and theoutdoor heat exchanger 23, therefrigerant pipe 44 is provided with arefrigerant temperature sensor 35. Therefrigerant temperature sensor 35 detects the temperature of the refrigerant that flows into theoutdoor heat exchanger 23, or the temperature of the refrigerant that flows out of theoutdoor heat exchanger 23. Between theoutdoor heat exchanger 23 and theoutdoor expansion valve 25, the outdoor unitliquid pipe 45 is provided with arefrigerant temperature sensor 36. Therefrigerant temperature sensor 36 detects the temperature of the refrigerant that flows out of theoutdoor heat exchanger 23, or the temperature of the refrigerant that flows into theoutdoor heat exchanger 23. In the vicinity of the suction opening (not shown) of theoutdoor unit 2, an outerair temperature sensor 37 is provided. The outerair temperature sensor 37 detects the temperature of the outer air that flows into theoutdoor unit 2, i.e., the outer air temperature. - Next, the three
indoor units 5a to 5c will be described. The threeindoor units 5a to 5c are provided withindoor heat exchangers 51a to 51c (user-side heat exchangers),indoor expansion valves 52a to 52c, the closingvalves 53a to 53c, the closingvalves 54a to 54c, andindoor fans 55a to 55c, respectively. Theindoor expansion valves 52a to 52c are indoor refrigerant flow rate adjuster. The closingvalves 53a to 53c are connected to the other end of the branchedliquid pipe 8. The closingvalves 54a to 54c are connected to the other end of the branchedgas pipe 9. These members except for theindoor fans 55a to 55c are mutually connected through refrigerant pipes, as will be described below. Thus, indoorunit refrigerant circuits 50a to 50c as part of therefrigerant circuit 100 are formed. - The
indoor units 5a to 5c have identical configurations. Thus, in the following description, the configuration of theindoor unit 5a will be described, and the description of the otherindoor units FIG. 1 , the members of theindoor unit 5b corresponding to the members of theindoor unit 5a are designated with the signs for the members of theindoor unit 5a with the "a" at the end replaced with "b". Similarly, the members of theindoor unit 5c corresponding to the members of theindoor unit 5a are designated with the signs for the members of theindoor unit 5a with the "a" at the end replaced with "c". - The
indoor heat exchanger 51a carries out heat exchange between the refrigerant and the indoor air taken into theindoor unit 5a by anindoor fan 55a (as will be described below). One refrigerant entry/exit opening of theindoor heat exchanger 51a is connected to the closingvalve 53a through an indoor unitliquid pipe 71a. The other refrigerant entry/exit opening of theindoor heat exchanger 51a is connected to the closingvalve 54a through an indoorunit gas pipe 72a. Theindoor heat exchanger 51a functions as an evaporator when theindoor unit 5a performs cooling operation. Theindoor heat exchanger 51a functions as a condenser when theindoor unit 5a performs heating operation. - The
indoor expansion valve 52a is an electronic expansion valve fitted to the indoor unitliquid pipe 71a. The opening degree of theindoor expansion valve 52a is adjusted based on the required cooling capacity when theindoor heat exchanger 51a functions as an evaporator. Similarly, the opening degree of theindoor expansion valve 52a is adjusted based on the required heating capacity when theindoor heat exchanger 51a functions as a condenser. - The
indoor fan 55a is formed of a resin material and is disposed in the vicinity of theindoor heat exchanger 51a. Theindoor fan 55a is rotated by a fan motor (not shown). Thus, the indoor air is taken into theindoor unit 5a. Then, the indoor air exchanges heat with the refrigerant in theindoor heat exchanger 51a, followed by being supplied to the indoor space. - Other than the configuration described above, the
indoor unit 5a is provided with various sensors. The indoor unitliquid pipe 71a is provided with a liquid-side temperature sensor 61a between theindoor heat exchanger 51a and theindoor expansion valve 52a. The liquid-side temperature sensor 61a is a heat exchanger entry temperature detector that detects the temperature of the refrigerant that flows into theindoor heat exchanger 51a, or the temperature of the refrigerant that flows out of theindoor heat exchanger 51a. The indoorunit gas pipe 72a is provided with a gas-side temperature sensor 62a. The gas-side temperature sensor 62a detects the temperature of the refrigerant that flows out of theindoor heat exchanger 51a, or the temperature of the refrigerant that flows into theindoor heat exchanger 51a. In the vicinity of the indoor air suction opening (not shown) of theindoor unit 5a, anindoor temperature sensor 63a is provided. Theindoor temperature sensor 63a is an indoor temperature detector that detects the temperature of the indoor air that flows into theindoor unit 5a, i.e., the indoor temperature. - Next, the flow of refrigerant and the operation of each member in the
refrigerant circuit 100 of the air conditioner 1 according to the present embodiment during an air-conditioning operation will be described with reference toFIG. 1 . In the following description, an example in which theindoor units 5a to 5c perform cooling operation will be described. A detailed description of an example in which theindoor units 5a to 5c perform heating operation will be omitted. The arrows inFIG. 1 indicate the flow of refrigerant during cooling operation. - As illustrated in
FIG. 1 , when theindoor units 5a to 5c perform cooling operation, the four-way valve 22 of theoutdoor unit 2 is switched to make communication between the ports a and b, and between the ports c and d. The communication between the ports is indicated inFIG. 1 by solid lines. Thus, theoutdoor heat exchanger 23 functions as a condenser, while theindoor heat exchangers 51a to 51c function as evaporators. - The high-pressure refrigerant discharged out of the
compressor 21 flows through thedischarge pipe 41 and theoil separator 24 into theoutflow pipe 43. The refrigerant flows into the four-way valve 22, and then flows out of the four-way valve 22 and into theoutdoor heat exchanger 23 through therefrigerant pipe 44. The refrigerant that flows into theoutdoor heat exchanger 23 exchanges heat with the outer air taken into theoutdoor unit 2 by the rotation of theoutdoor fan 29, whereby the refrigerant is condensed. The refrigerant flows out of theoutdoor heat exchanger 23 and then flows through the outdoor unitliquid pipe 45, followed by flowing into theliquid pipe 8 through both the fully openedoutdoor expansion valve 25 and the fully opened operatingvalve 27. - The refrigerant that flows through the
liquid pipe 8 is branched and flows into theindoor units 5a to 5c through the closingvalves 53a to 53c, respectively. The refrigerant flows through the indoorunit liquid pipes 71a to 71c, and is depressurized into low-pressure refrigerant when the refrigerant passes theindoor expansion valves 52a to 52c. The refrigerant that flows into theindoor heat exchangers 51a to 51c through the indoorunit liquid pipes 71a to 71c exchanges heat with the indoor air taken into theindoor units 5a to 5c by the rotation of theindoor fans 55a to 55c, whereby the refrigerant is evaporated. Thus, theindoor heat exchangers 51a to 51c function as evaporators, and the indoor air that exchanges heat with the refrigerant in theindoor heat exchangers 51a to 51c is blown indoor out of an outlet (not shown). In this way, the air of the indoor spaces in which theindoor units 5a to 5c are installed is cooled. - The refrigerant that flows out of the
indoor heat exchangers 51a to 51c flows through the indoorunit gas pipes 72a to 72c and into thegas pipe 9 through the closingvalves 54a to 54c. The refrigerant flows through thegas pipe 9 and into theoutdoor unit 2 through the operatingvalve 28. The refrigerant then flows through the outdoorunit gas pipe 46, the four-way valve 22, and theintake pipe 42, and is suctioned into thecompressor 21 where the refrigerant is compressed again. - As described above, the refrigerant is circulated through the
refrigerant circuit 100 as the air conditioner 1 performs cooling operation. - When the
indoor units 5a to 5c perform heating operation, the four-way valve 22 of theoutdoor unit 2 is switched to make communication between the ports a and d. The four-way valve 22 is also switched to make communication between the ports b and c. In -
FIG. 1 , the communication between the ports is indicated by broken lines. Thus, theoutdoor heat exchanger 23 functions as an evaporator, while theindoor heat exchangers 51a to 51c function as condensers. - With reference to
FIGS. 1 and2 , the effect of disposing the first three-way valve 11 and the second three-way valve 12 in the air conditioner 1 will be described. - First, with reference to
FIG. 1 , the effect of the first three-way valve 11 disposed on theoutflow pipe 43 will be described. Thecompressor 21 is driven at a predetermined rotational speed when the air conditioner 1 is performing air-conditioning operation. Vibrations caused by the rotation of thecompressor 21 are also transmitted to thedischarge pipe 41 connected to the refrigerant discharge opening of thecompressor 21. - If the first three-
way valve 11 is fitted to thedischarge pipe 41, when thedischarge pipe 41 vibrates due to the driving of thecompressor 21, a large force may be applied to the body of thedischarge pipe 41, the connection part between thedischarge pipe 41 and the compressor 21 (on the refrigerant discharge side), and the connection part between thedischarge pipe 41 and the oil separator 24 (on the refrigerant inflow side), due to the weight of the first three-way valve 11. As a result, thedischarge pipe 41 and the above connection parts may be damaged. - However, as illustrated in
FIG. 1 , the first three-way valve 11 of the air conditioner 1 according to the present embodiment is disposed on theoutflow pipe 43. Thus, even if thedischarge pipe 41 vibrates due to the driving of thecompressor 21, the force applied to thedischarge pipe 41 and the connection parts between thedischarge pipe 41 and the other devices is decreased compared with the case where the first three-way valve 11 is fitted to thedischarge pipe 41, whereby the damage to these parts can be suppressed. Further, as described above, theoil separator 24 is fixed to the casing of theoutdoor unit 2 using metal fittings and the like. Thus, the occurrence of vibrations in theoil separator 24 due to the driving of thecompressor 21 can be suppressed. Moreover, the vibration of theoutflow pipe 43 connected to theoil separator 24 can be suppressed. Therefore, due to the weight of the first three-way valve 11 fitted to theoutflow pipe 43, application of a large force to theoutflow pipe 43 and the connection parts between theoutflow pipe 43 and other devices can be also suppressed. As a result, damage to theoutflow pipe 43 and the above-mentioned connection parts can be also suppressed. - Next, with reference to
FIGS. 1 and2 , the states of communication in the first three-way valve 11 and the second three-way valve 12 when thecompressor 21 is detached from the outdoor unitrefrigerant circuit 20, and when thecompressor 21 is re-attached to the outdoor unitrefrigerant circuit 20, and their effect will be described. - The case where the
compressor 21 is detached from the outdoor unitrefrigerant circuit 20 will be described. First, a suction hose (not shown) of a refrigerant recovery machine is connected to the port g of the first three-way valve 11. Then, as illustrated inFIG. 2 , when thecompressor 21 is detached from the refrigerant circuit, the first three-way valve 11 is switched to make communication between the ports e and g, while the second three-way valve 12 is switched to make communication between the ports j and k. Thus, a part between the port e of the first three-way valve 11 and the port j of the second three-way valve 12 (hereafter referred to as a separated refrigerant circuit) is cut off from the outdoor unitrefrigerant circuit 20. - Next, the refrigerant recovery machine is driven to recover the refrigerant remaining in the separated refrigerant circuit. Thus, the amount of refrigerant that needs to be recovered can be decreased compared with the case where, for example, the refrigerant is recovered from the refrigerant circuit of the
outdoor unit 2 as a whole by using the service ports (the blacked-out ports inFIG. 1 ) of the operatingvalve 27 and the operatingvalve 28. Thus, the time required for refrigerant recovery can be decreased. Preferably, the suction hose of the refrigerant recovery machine may be connected to the port k of the second three-way valve 12 to recover the remaining refrigerant in the separated refrigerant circuit. - After the refrigerant recovery from the separated refrigerant circuit is completed, the
compressor 21 is separated from thedischarge pipe 41 and theintake pipe 42 and is thus detached. Thereafter, thedetached compressor 21 is maintained and attached to the outdoorunit refrigerator circuit 20. Alternatively, anew compressor 21 is attached to the outdoor unitrefrigerant circuit 20. - When the
compressor 21 is attached to the outdoor unitrefrigerant circuit 20, thedischarge pipe 41 is connected to the refrigerant discharge opening of thecompressor 21 and welded, while theintake pipe 42 is connected to the refrigerant intake opening of thecompressor 21 and welded. After the welding is completed, a vacuum pump (not shown) is connected to the port g of the first three-way valve 11 to vacuum the separated refrigerant circuit. In this case, too, the amount of air that needs to be removed can be decreased compared with the case where, for example, the refrigerant circuit of theoutdoor unit 2 as a whole is vacuumed by using the service ports of the operatingvalve 27 and the operatingvalve 28. Thus, the time required for vacuuming can be decreased. Preferably, the vacuum pump may be connected to the port k of the second three-way valve 12 to vacuum the separated refrigerant circuit. - After the vacuuming of the separated refrigerant circuit is completed, a tank with refrigerant sealed therein (not shown; hereafter referred to as a refrigerant tank) is connected to the service port of the operating
valve 27. In the refrigerant tank, an amount of refrigerant sufficient for filling the amount of refrigerant recovered from the separated refrigerant circuit at the time of detaching thecompressor 21 is sealed. By connecting the refrigerant tank to the service port of the operatingvalve 27, the refrigerant flows from the high-pressure refrigerant tank into the outdoor unitliquid pipe 45 and theliquid pipe 8. Thus, the refrigerant is charged in therefrigerant circuit 100. The amount of refrigerant charged is no more than the amount of refrigerant recovered from the separated refrigerant circuit when thecompressor 21 is detached. Thus, the time required for refrigerant charging can be decreased. - After the charging of refrigerant into the
refrigerant circuit 100 is completed, the refrigerant tank is detached from the service port of the operatingvalve 27. Then, the second three-way valve 12 is switched to make communication between the ports h and j, whereby the pressures in the ports h and j are made even (equalized). Then, the first three-way valve 11 is switched to make communication between the ports e and f. In this way, the attaching of thecompressor 21 onto the refrigerant circuit is completed. - As described above, in the air conditioner 1, the first three-
way valve 11 and the second three-way valve 12 are operated when thecompressor 21 is detached from the outdoor unitrefrigerant circuit 20, and when thecompressor 21 is re-attached to the outdoor unitrefrigerant circuit 20. Thus, the time required for refrigerant recovery when detaching thecompressor 21, and the time for vacuuming and refrigerant charging when attaching thecompressor 21 can be significantly decreased. Thus, the maintainability of the air conditioner 1 is improved. - With reference to
FIGS. 1 and3 , the effect of the second three-way valve 12 disposed on the four-way valve 22 side of theintake pipe 42 with respect to the point of connection of theoil return pipe 47 and theintake pipe 42, in addition to the first three-way valve 11 disposed on theoutflow pipe 43, will be described. - As illustrated in
FIG. 3 , in case that when the air conditioner 1 is performing air-conditioning operation, namely, when thecompressor 21 is being driven, the first three-way valve 11 fails and is fixed in a closed state, then the refrigerant discharged out of thecompressor 21 flows through thedischarge pipe 41 into theoil separator 24, and then flows out of theoil separator 24 into theoil return pipe 47. The refrigerant then flows into theintake pipe 42 through thecapillary tube 26, flows through theintake pipe 42, and is then suctioned into thecompressor 21. - If the first three-
way valve 11 is fitted to thedischarge pipe 41, when the first three-way valve 11 fails and is fixed in the closed state, the refrigerant discharged out of thecompressor 21 is blocked by the first three-way valve 11. If thecompressor 21 continues to be driven in this state, thecompressor 21 may fail. - In case that when the second three-
way valve 12 is disposed on thecompressor 21 side of theintake pipe 42 with respect to the point of connection of theoil return pipe 47 and theintake pipe 42, the second three-way valve 12 fails and is in a closed state, then the refrigerant that flows out of theoil return pipe 47 into theintake pipe 42 is blocked by the second three-way valve 12. In this case, the refrigerant cannot be suctioned in, and thecompressor 21 may be damaged. - However, according to the present embodiment, as illustrated in
FIGS. 1 and3 , the first three-way valve 11 is disposed on the outflow pipe and the second three-way valve 12 is disposed on the four-way valve 22 side of theintake pipe 42 with respect to the point of connection of theoil return pipe 47 and theintake pipe 42. Thus, the refrigerant discharged out of thecompressor 21 flows through thedischarge pipe 41, theoil separator 24, theoil return pipe 47, and theintake pipe 42 successively, and is then suctioned into thecompressor 21. As a result, even when the first three-way valve 11 and/or the second three-way valve 12 fails and is placed in the closed state, damage to thecompressor 21 can be suppressed. - However, if the driving of the
compressor 21 continues while the first three-way valve 11 and/or the second three-way valve 12 is closed, the discharge pressure of thecompressor 21 may be increased beyond an upper-limit value. Thus, a threshold value may be set lower than the upper-limit value of the discharge pressure of thecompressor 21 by a predetermined value. Then, high pressure protection control such that thecompressor 21 stops when the discharge pressure of thecompressor 21 reaches the threshold value may be implemented. The discharge pressure of thecompressor 21 is detected by thehigh pressure sensor 31. - As described above, in the air conditioner according to the present disclosure, the first three-
way valve 11 is disposed on theoutflow pipe 43, with one end of theoutflow pipe 43 connected to theoil separator 24 fixed onto the casing of theoutdoor unit 2. Thus, thedischarge pipe 41 and theoutflow pipe 43 can be suppressed from greatly vibrating due to vibration of thecompressor 21. Thus, damage to thedischarge pipe 41 and the connection parts between thedischarge pipe 41 and the other devices due to vibrations can be suppressed. Further, damage to theoutflow pipe 43 and the connection parts between theoutflow pipe 43 and the other devices due to vibrations can be suppressed. - When the compressor is attached to the refrigerant circuit, vacuuming can be performed from the vacant port of the first three-way valve or the second three-way valve (i.e., the port to which no refrigerant pipe is connected). Thus, the cost increase due to separately fitting the service valve and/or the branch pipe can be limited, whereby the time required for vacuuming can be decreased.
- The embodiment has been described above with reference to the example of the air conditioner in which a plurality (three) of indoor units is connected to one outdoor unit through refrigerant pipes. However, the air conditioner according to the embodiment of the present disclosure is not limited to such a configuration. For example, the air conditioner according to the embodiment of the present disclosure includes an air conditioner in which one outdoor unit and one indoor unit are connected through refrigerant pipes, and an air conditioner in which a plurality of outdoor units and a plurality of indoor units are connected through refrigerant pipes.
- The air conditioner according to the present disclosure may be expressed as a first air conditioner and a second air conditioner as follows.
- The first air conditioner includes a refrigerant circuit including a compressor, a flow path switcher, a heat source-side heat exchanger, at least one expansion valve, and a user-side heat exchanger which are connected through a refrigerant pipe; an oil separator disposed between the compressor and the heat source-side heat exchanger configured to separate a refrigerant oil from a refrigerant discharged from the compressor; an oil return pipe with one end connected to the oil separator and the other end connected to an intake pipe which is a part of a refrigerant pipe connecting a refrigerant intake opening of the compressor and the flow path switcher, and having a capillary tube; and a first three-way valve disposed on an outflow pipe which is a part of a refrigerant pipe connected to a refrigerant outflow opening of the oil separator.
- The second air conditioner is the first air conditioner further including a second three-way valve fitted to the intake pipe and disposed between a connection part of the oil return pipe to the intake pipe and the flow path switcher.
- According to the above air conditioners, because the first three-way valve is disposed on the outflow pipe, a large force is not applied to the discharge pipe and the connection part between the discharge pipe and other devices even when the discharge pipe is vibrated by the vibration of the compressor, so that the discharge pipe and the connection part between the discharge pipe and the other devices are not damaged. Further, when re-attaching the detached compressor onto the refrigerant circuit, vacuuming can be performed through a vacant port of the first three-way valve and the second three-way valve (the port to which the refrigerant pipe is not connected), whereby the cost increase due to the fitting of separate service valve or branch pipe can be avoided, and high maintainability can be obtained.
- The foregoing detailed description has been presented for the purposes of illustration and description. Many modifications and variations are possible in light of the above teaching. It is not intended to be exhaustive or to limit the subject matter described herein to the precise form disclosed. Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims appended hereto.
Claims (5)
- An air conditioner outdoor unit comprising:a compressor;a heat source-side heat exchanger connected to the compressor;an oil separator disposed between a refrigerant discharge opening of the compressor and the heat source-side heat exchanger configured to separate a refrigerant oil from a refrigerant discharged from the compressor; anda first three-way valve fitted to a refrigerant pipe between the oil separator and the heat source-side heat exchanger.
- The air conditioner outdoor unit according to claim 1, further comprising a flow path switching unit for switching the direction of flow of refrigerant in the heat source-side heat exchanger,
wherein:the flow path switching unit is disposed between the heat source-side heat exchanger and the oil separator; andthe first three-way valve is disposed on a refrigerant pipe between the flow path switching unit and the oil separator. - The air conditioner outdoor unit according to claim 2, further comprising:an oil return pipe with one end connected to the oil separator and the other end connected to a refrigerant pipe connected to a refrigerant intake opening of the compressor; anda second three-way valve disposed between a connection part of the refrigerant pipe and the oil return pipe, and the flow path switching unit.
- The air conditioner outdoor unit according to claim 3, wherein:the first three-way valve includes a first port connected to the oil separator, a second port connected to the flow path switching unit, and a third port which is a service port; andthe second three-way valve includes a first port connected to the flow path switching unit, a second port connected to the refrigerant intake opening of the compressor, and a third port which is a service port.
- An air conditioner comprising:the outdoor unit according to any one of claims 1 to 4; andan indoor unit connected to the outdoor unit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2013032900A JP2014163548A (en) | 2013-02-22 | 2013-02-22 | Air conditioning apparatus |
Publications (1)
Publication Number | Publication Date |
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EP2770279A1 true EP2770279A1 (en) | 2014-08-27 |
Family
ID=50071522
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP14154768.7A Withdrawn EP2770279A1 (en) | 2013-02-22 | 2014-02-12 | Air conditioner outdoor unit and air conditioner |
Country Status (5)
Country | Link |
---|---|
US (1) | US20140238069A1 (en) |
EP (1) | EP2770279A1 (en) |
JP (1) | JP2014163548A (en) |
CN (1) | CN104006461A (en) |
AU (1) | AU2014200687B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3064867A3 (en) * | 2015-03-04 | 2016-12-21 | Fujitsu General Limited | Air conditioner |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012169110A1 (en) * | 2011-06-09 | 2012-12-13 | 三菱電機株式会社 | Indoor unit for air-conditioner |
JP6293647B2 (en) | 2014-11-21 | 2018-03-14 | ヤンマー株式会社 | heat pump |
KR20210109844A (en) * | 2020-02-28 | 2021-09-07 | 엘지전자 주식회사 | Air conditioning apparatus and a water supplying method of the same |
WO2023181117A1 (en) * | 2022-03-22 | 2023-09-28 | 日本電気株式会社 | Cooling device, and cooling method for cooling device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07332784A (en) | 1994-06-14 | 1995-12-22 | Matsushita Refrig Co Ltd | Air conditioner |
EP1956320A1 (en) * | 2005-11-30 | 2008-08-13 | Daikin Industries, Ltd. | Freezing device |
US20080289353A1 (en) * | 2007-05-22 | 2008-11-27 | Maruya Richard H | Refrigerant service port valve for air conditioners |
EP2051029A1 (en) * | 2006-08-10 | 2009-04-22 | Daikin Industries, Ltd. | Coolant filling method in a refrigeration device using carbon dioxide as coolant |
WO2012063289A1 (en) * | 2010-11-11 | 2012-05-18 | 三菱電機株式会社 | Refrigeration cycle device and cooling medium filling method |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3638976B2 (en) * | 1994-12-08 | 2005-04-13 | 三菱電機株式会社 | Refrigeration equipment |
JP2001241814A (en) * | 2000-03-01 | 2001-09-07 | Sharp Corp | Air conditioner and refrigerant filling method |
JP4089139B2 (en) * | 2000-07-26 | 2008-05-28 | ダイキン工業株式会社 | Air conditioner |
JP2003049960A (en) * | 2001-08-07 | 2003-02-21 | Fujitsu General Ltd | Three way valve |
JP2004028359A (en) * | 2002-06-21 | 2004-01-29 | Mitsubishi Electric Corp | Air-conditioning and freezing device, heat source side unit, load side unit, replacing method of compressor and adding method of heat exchanger |
JP2006170500A (en) * | 2004-12-14 | 2006-06-29 | Mitsubishi Heavy Ind Ltd | Air conditioner and its operating method |
JP4082434B2 (en) * | 2006-05-18 | 2008-04-30 | ダイキン工業株式会社 | Refrigeration equipment |
KR20080058789A (en) * | 2006-12-22 | 2008-06-26 | 엘지전자 주식회사 | Airconditioner |
JP4488093B2 (en) * | 2008-07-24 | 2010-06-23 | ダイキン工業株式会社 | Air conditioner |
JP2010185585A (en) * | 2009-02-10 | 2010-08-26 | Mitsubishi Electric Corp | Air conditioner and method of updating unit |
JP5283587B2 (en) * | 2009-08-28 | 2013-09-04 | 三洋電機株式会社 | Air conditioner |
KR101636326B1 (en) * | 2009-12-24 | 2016-07-21 | 삼성전자주식회사 | Refrigerating Cycle Apparatus, Heat Pump Type Hot Water Supply Air conditioner and Outdoor Unit thereof |
EP2554926B1 (en) * | 2010-03-29 | 2019-09-04 | Mitsubishi Electric Corporation | Air conditioning apparatus |
JP2012007774A (en) * | 2010-06-23 | 2012-01-12 | Panasonic Corp | Air conditioner |
US8756943B2 (en) * | 2011-12-21 | 2014-06-24 | Nordyne Llc | Refrigerant charge management in a heat pump water heater |
-
2013
- 2013-02-22 JP JP2013032900A patent/JP2014163548A/en active Pending
-
2014
- 2014-02-10 AU AU2014200687A patent/AU2014200687B2/en active Active
- 2014-02-12 EP EP14154768.7A patent/EP2770279A1/en not_active Withdrawn
- 2014-02-20 US US14/184,882 patent/US20140238069A1/en not_active Abandoned
- 2014-02-21 CN CN201410060230.7A patent/CN104006461A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07332784A (en) | 1994-06-14 | 1995-12-22 | Matsushita Refrig Co Ltd | Air conditioner |
EP1956320A1 (en) * | 2005-11-30 | 2008-08-13 | Daikin Industries, Ltd. | Freezing device |
EP2051029A1 (en) * | 2006-08-10 | 2009-04-22 | Daikin Industries, Ltd. | Coolant filling method in a refrigeration device using carbon dioxide as coolant |
US20080289353A1 (en) * | 2007-05-22 | 2008-11-27 | Maruya Richard H | Refrigerant service port valve for air conditioners |
WO2012063289A1 (en) * | 2010-11-11 | 2012-05-18 | 三菱電機株式会社 | Refrigeration cycle device and cooling medium filling method |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3064867A3 (en) * | 2015-03-04 | 2016-12-21 | Fujitsu General Limited | Air conditioner |
US10024589B2 (en) | 2015-03-04 | 2018-07-17 | Fujitsu General Limited | Air conditioner having defrosting operation |
Also Published As
Publication number | Publication date |
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US20140238069A1 (en) | 2014-08-28 |
CN104006461A (en) | 2014-08-27 |
AU2014200687B2 (en) | 2017-09-28 |
AU2014200687A1 (en) | 2014-09-11 |
JP2014163548A (en) | 2014-09-08 |
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