CN111656102A - Low-capacity indoor unit - Google Patents

Low-capacity indoor unit Download PDF

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Publication number
CN111656102A
CN111656102A CN201980010681.0A CN201980010681A CN111656102A CN 111656102 A CN111656102 A CN 111656102A CN 201980010681 A CN201980010681 A CN 201980010681A CN 111656102 A CN111656102 A CN 111656102A
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CN
China
Prior art keywords
unit
indoor
low
capacity
indoor unit
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Pending
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CN201980010681.0A
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Chinese (zh)
Inventor
藤冈裕记
堤智彦
村田胜则
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Daikin Industries Ltd
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Daikin Industries Ltd
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Publication of CN111656102A publication Critical patent/CN111656102A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/52—Indication arrangements, e.g. displays
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/50—Air quality properties
    • 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
    • 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
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger
    • 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
    • F25B2313/031—Sensor arrangements
    • F25B2313/0315—Temperature sensors near the outdoor heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/23—High amount of refrigerant in the system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2106—Temperatures of fresh outdoor air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

A low-capacity indoor unit (20C) having a rated cooling capacity of less than 2.2kW is provided with an informing unit (100d) for informing an abnormality when the low-capacity indoor unit is connected to an outdoor unit other than a dedicated outdoor unit (10) which allows combination.

Description

Low-capacity indoor unit
Technical Field
The present disclosure relates to a low-capacity indoor unit.
Background
Conventionally, there is an air conditioner including a ceiling-mounted indoor unit fitted to an indoor ceiling surface and an outdoor unit connected to the indoor unit (see, for example, japanese patent application laid-open No. 2016-.
When a combustible refrigerant is used in the air conditioner, the indoor unit is installed at a predetermined installation height, thereby satisfying the "floor area applicable based on the refrigerant charge amount" specified by the international standard. Thus, even if the refrigerant leaks from the indoor unit, the refrigerant concentration in the room does not become constant or higher.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-148510
Disclosure of Invention
In the conventional air conditioner described above, the rated cooling capacity is generally 2.2kW or more, and when a low-capacity indoor unit having a rated cooling capacity of less than 2.2kW is installed in a space having a small floor area such as a toilet, if the low-capacity indoor unit is leaked from the low-capacity indoor unit and fills the small space, there is a problem that the risk of leakage of the refrigerant due to the amount of refrigerant filled increases. In particular, when a flammable refrigerant (including a slightly flammable refrigerant such as R32 refrigerant) is used, the risk of ignition or the like increases when the gas concentration increases to some extent.
In the present disclosure, a low-capacity indoor unit that reduces the risk of refrigerant leakage is proposed.
Means for solving the problems
The present disclosure relates to a low-energy indoor unit, the rated refrigerating capacity of the low-energy indoor unit is less than 2.2kW, and is characterized in that,
the low-capacity indoor unit has a notification unit that notifies an abnormality when the low-capacity indoor unit is connected to an outdoor unit other than the exclusive outdoor unit that allows combination.
According to the present disclosure, since the rated cooling capacity is less than 2.2kW and the notification unit notifies an abnormality when the outdoor unit is connected to an outdoor unit other than the exclusive-use outdoor unit that allows combination, the outdoor unit is not connected to another outdoor unit having a large refrigerant filling amount other than the exclusive-use outdoor unit and is operated, and the risk of refrigerant leakage can be reduced.
In the low-capacity indoor unit according to one aspect of the present disclosure, the rated cooling capacity is 1.6kW or less.
According to the above embodiment, since the rated cooling capacity is 1.6kW or less, the air conditioner is suitable for air conditioning in a narrow space such as a toilet or a kitchen, and safety is high even when a refrigerant leaks in the narrow space.
In the low-energy indoor unit according to one aspect of the present disclosure, the dedicated outdoor unit corresponds to a multi-type air conditioner to which a plurality of indoor units can be connected, the low-energy indoor unit is operable as an indoor unit of the multi-type air conditioner, and the low-energy indoor unit is at least one of the plurality of indoor units.
According to the present disclosure, a multi-type air conditioner can be provided in which a plurality of indoor units including at least one low-capacity indoor unit are connected to a dedicated outdoor unit.
In the low-capacity indoor unit according to the one aspect of the present disclosure, the notification unit notifies an abnormality when the allowable refrigerant filling amount of the outdoor unit notified from the connected outdoor unit is larger than the allowable refrigerant filling amount calculated in advance based on the rated cooling capacity.
According to the present disclosure, it is possible to determine whether or not the outdoor unit is a dedicated outdoor unit that allows combination by the notification unit, based on the allowable refrigerant filling amount of the outdoor unit notified from the connected outdoor unit.
Drawings
Fig. 1 is a configuration diagram of a multi-type air conditioner including a low-capacity indoor unit according to embodiment 1 of the present disclosure.
Fig. 2 is an external view of the low capacity indoor unit as viewed obliquely from below.
Fig. 3 is a block diagram of the indoor control device of the low-capacity indoor unit.
Fig. 4 is a flowchart illustrating an operation of the indoor control device.
Fig. 5 is a block diagram of an indoor control device of a low-capacity indoor unit according to embodiment 2 of the present disclosure.
Fig. 6 is a flowchart illustrating an operation of the indoor control device.
Detailed Description
Hereinafter, embodiments will be described.
[ embodiment 1 ]
Fig. 1 is a configuration diagram of a multi-type air conditioner including a low-capacity indoor unit 20C according to embodiment 1 of the present disclosure.
As shown in fig. 1, the multi-type air conditioner according to embodiment 1 includes: an indoor unit 20A having an indoor heat exchanger 4A and an indoor fan 5A; an indoor unit 20B having an indoor heat exchanger 4B and an indoor fan 5B; a low-capacity indoor unit 20C having an indoor heat exchanger 4C and an indoor fan 5C; and a dedicated outdoor unit 10 connected to the indoor units 20A and 20B and the low-capacity indoor unit 20C via refrigerant pipes.
The dedicated outdoor unit 10 corresponds to a multi-type air conditioner to which a plurality of indoor units can be connected, and the low-capacity indoor unit 20C can operate as an indoor unit of the multi-type air conditioner.
In fig. 1, 1 is a compressor, 2 is a four-way switching valve, one end of which is connected to the discharge side of the compressor 1, 3 is an outdoor heat exchanger, one end of which is connected to the other end of the four-way switching valve 2, EVA, EVB, EVC are motor-operated expansion valves, one end of which is connected to the other end of the outdoor heat exchanger 3, 4A, 4B, 4C are indoor heat exchangers, one ends of which are connected to the other ends of the motor-operated expansion valves EVA, EVB, EVC, respectively, and 6 is an accumulator, one end of which is connected to the other ends of the indoor heat exchangers 4A, 4B, 4C via the four-way switching valve 2, and the other end of which is. Indoor fans 5A, 5B, and 5C are disposed near the indoor heat exchangers 4A, 4B, and 4C, respectively.
Further, a plurality of refrigerant pipe connection portions 7A, 7B, and 7C are connected to the other ends of the electric expansion valves EVA, EVB, and EVC, and one ends of the indoor heat exchangers 4A, 4B, and 4C are connected to the plurality of refrigerant pipe connection portions 7A, 7B, and 7C, respectively, via communication pipes (refrigerant pipes). Further, a plurality of refrigerant pipe connection portions 8A, 8B, and 8C are connected to the other ends of the indoor heat exchangers 4A, 4B, and 4C via communication pipes (refrigerant pipes).
The compressor 1, the four-way switching valve 2, the outdoor heat exchanger 3, the electric expansion valves EVA, EVB, EVC, the indoor heat exchangers 4A, 4B, 4C, and the accumulator 6 constitute a refrigerant circuit. This refrigerant circuit is filled with a slightly flammable R32 refrigerant.
Further, a discharge pipe temperature sensor 11 is provided on the discharge side of the compressor 1. Further, an outdoor heat exchanger temperature sensor 12 that detects the temperature of the outdoor heat exchanger is provided in the outdoor heat exchanger 3, and an outdoor temperature sensor 13 that detects the outdoor temperature is provided in the vicinity of the outdoor heat exchanger 3.
An indoor heat exchanger temperature sensor 15A for detecting the temperature of the indoor heat exchanger is provided in the indoor heat exchanger 4A, and an indoor temperature sensor 16A for detecting the indoor temperature is provided in the vicinity of the indoor heat exchanger 4A. An indoor heat exchanger temperature sensor 15B for detecting the temperature of the indoor heat exchanger is provided in the indoor heat exchanger 4B, and an indoor temperature sensor 16B for detecting the indoor temperature is provided in the vicinity of the indoor heat exchanger 4B. Further, an indoor heat exchanger temperature sensor 15C for detecting the temperature of the indoor heat exchanger is provided in the indoor heat exchanger 4C, and an indoor temperature sensor 16C for detecting the indoor temperature is provided in the vicinity of the indoor heat exchanger 4C.
The exclusive outdoor unit 10 includes an outdoor control device 18 including a microcomputer and an input/output circuit. The outdoor control device 18 includes a communication unit 18b and an operation control unit 18a that controls the compressor 1, the motor-operated expansion valves EVA, EVB, EVC, and the like. Each of the indoor units 20A and 20B includes an indoor control device not shown, and the low-capacity indoor unit 20C includes the indoor control device 100 shown in fig. 2.
The indoor control devices of the indoor units 20A and 20B and the indoor control device 100 of the low-capacity indoor unit 20C communicate with the outdoor control device 18 of the exclusive outdoor unit 10 via communication lines (not shown), and thereby the outdoor control device 18, the indoor control devices of the indoor units 20A and 20B, and the indoor control device 100 of the low-capacity indoor unit 20C operate as a multi-split air conditioner in cooperation with each other.
In the multi-type air conditioner, when the cooling operation is performed in the indoor units 20A and 20B and the low-capacity indoor unit 20C, the four-way switching valve 2 is switched to the position indicated by the broken line, and the operation of the compressor 1 is started. Then, the electric expansion valves EVA, EVB, EVC are opened to predetermined opening degrees, respectively. Then, by operating an outdoor fan (not shown) in the outdoor heat exchanger 3, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 exchanges heat with outdoor air and is condensed to become a liquid refrigerant. Next, by operating the indoor fans 5A, 5B, and 5C, the liquid refrigerant from the indoor heat exchangers 4A, 4B, and 4C is decompressed by the motor-operated expansion valves EVA, EVB, and EVC, and then exchanges heat with the indoor air in the indoor heat exchangers 4A, 4B, and 4C to be evaporated, thereby becoming a gas refrigerant, which is returned to the suction side of the compressor 1.
Here, the rated cooling capacity of the indoor units 20A and 20B is 2.2kW, and the rated cooling capacity of the low-capacity indoor unit 20C is 0.8 kW. That is, the low-capacity indoor unit 20C has lower capacity than the indoor units 20A and 20B.
On the other hand, when the heating operation is performed in the indoor units 20A and 20B and the low-capacity indoor unit 20C, the four-way switching valve 2 is switched to the position indicated by the solid line, and the operation of the compressor 1 is started. Then, the electric expansion valves EVA, EVB, EVC are opened to predetermined opening degrees, respectively. Then, by operating the indoor fans 5A, 5B, and 5C, the high-temperature and high-pressure gas refrigerant discharged from the compressor 1 exchanges heat with the indoor air in the indoor heat exchangers 4A, 4B, and 4C, and is condensed to become a liquid refrigerant. Next, by operating the outdoor fan (not shown) in the outdoor heat exchanger 3, the liquid refrigerant from the indoor heat exchangers 4A, 4B, and 4C is decompressed by the motor-operated expansion valves EVA, EVB, and EVC, and then exchanges heat with outdoor air to be evaporated into a gas refrigerant, which is returned to the suction side of the compressor 1.
Fig. 2 is an external view of the low-capacity indoor unit 20C as viewed obliquely from below. The indoor unit is a top-surface embedded type indoor unit.
As shown in fig. 2, the low-capacity indoor unit 20C includes a casing main body 101, a rectangular panel 102 attached to the lower side of the casing main body 101, and a grill 103 detachably attached to the panel 102.
On one side in the longitudinal direction of panel 102, air outlet 110 is provided along the short side of panel 102. Further, a shutter 120 is rotatably attached to the panel 102. Fig. 2 shows a state in which the outlet 110 is closed by the baffle 120.
Further, a drain socket 107 is provided so as to protrude from the side wall of the casing main body 101. A drain hose (not shown) is connected to the drain socket 107 from the outside. The pipe connection portions 105 and 106 are provided so as to protrude from the side walls of the casing main body 101. Refrigerant pipes (not shown) are connected to the pipe connection portions 105 and 106 from the outside.
In fig. 2, reference numeral 108 denotes an electrical component, and 111 to 113 denote suspension fittings provided to protrude laterally from the housing main body 101.
Fig. 3 is a block diagram of the indoor control device 100 of the low-capacity indoor unit 20C.
As shown in fig. 3, the low-capacity indoor unit 20C includes an indoor control device 100 including a microcomputer and an input/output circuit. The indoor control device 100 includes an operation control unit 100a, a communication unit 100b, a model determination unit 100c, and a notification unit 100 d.
The operation control unit 100a controls the fan motor 21 and the damper drive unit 22 based on detection signals of the indoor temperature sensor 16C and the indoor heat exchanger temperature sensor 15C.
The communication unit 100b communicates with the outdoor control device 18 (shown in fig. 1) of the exclusive outdoor unit 10 connected to the low-capacity indoor unit 20C via the communication unit 18 b.
The model determination unit 100C determines whether or not the connected outdoor unit is a dedicated outdoor unit that is permitted to be combined with the low-capacity indoor unit 20C, based on the model ID of the outdoor unit received by the communication unit 100 b.
When the outdoor unit connected to the outdoor unit is determined not to be the exclusive outdoor unit allowing the combination, the notification unit 100d causes the power lamp of the display unit 23 to blink to notify an abnormality. Here, the power lamp may be caused to blink and a buzzer sound may be emitted. The means for notifying the abnormality is not limited to the power lamp or the buzzer sound, and the abnormality may be notified by a display unit, an audio output, or the like.
Fig. 4 is a flowchart illustrating the operation of the indoor control device 100.
First, the outdoor unit is connected to the low-capacity indoor unit 20C, and when the power is turned on first, the indoor control device 100 starts operating.
Then, in step S1 shown in fig. 4, it is determined whether or not the outdoor unit is connected to the low-energy indoor unit 20C, and if it is determined that the outdoor unit is connected to the low-energy indoor unit 20C, the process proceeds to step S2. On the other hand, if the outdoor unit is not connected to the low-capacity indoor unit 20C, step S1 is repeated.
Then, in step S2, the communication unit 100b acquires the model ID from the outdoor unit.
Next, the process proceeds to step S3, where the model determination unit 100c determines whether or not the connected outdoor units are exclusive outdoor units permitted to be combined, based on the model IDs acquired from the outdoor units.
If it is determined in step S3 that the outdoor unit is a dedicated outdoor unit, the process proceeds to step S4, whereas if it is determined that the outdoor unit is not a dedicated outdoor unit, the process proceeds to step S5, and the notification unit 100d notifies an abnormality, thereby ending the process.
Then, in step S4, the cooling operation or the heating operation, which is the normal operation, is performed in accordance with a command from a remote controller or the like.
In the low-energy indoor unit 20C having the above-described configuration, the rated cooling capacity is less than 2.2kW, and when the low-energy indoor unit is connected to an outdoor unit other than the exclusive outdoor unit 10 which is allowed to be combined, an abnormality is notified by the notification unit 100 d. Therefore, the outdoor unit is not connected to another outdoor unit having a large refrigerant filling amount other than the exclusive outdoor unit 10 and is not operated, and the risk of refrigerant leakage can be reduced.
Here, the allowable refrigerant filling amount of the outdoor unit 10 is a refrigerant filling amount to be filled into the refrigerant circuit when each indoor unit is connected by the maximum pipe length in the multi-type air conditioner including the outdoor unit 10 and the maximum number of indoor units connected to the outdoor unit 10.
The allowable refrigerant filling amount of the exclusive outdoor unit 10 is 1.8 kg. In this case, it is assumed that the installation site is a toilet or the like and the room area is 3.3m2× the maximum concentration at the time of refrigerant leakage was 0.227kg/m when the height of the ceiling was 2.4m3(≒1.8kg(3.3m2× 2.4.4 m)) or less.
In a household multi-type air conditioner, the allowable refrigerant charge amount is 4.0 kg. In this case, it is assumed that the installation site is a living room, a kitchen, or the like, and the room area is about 7m2× the maximum concentration at the time of refrigerant leakage was 0.238kg/m when the height of the top surface was 2.4m3(≒4.0kg(7m2× 2.4.4 m)) or less, even if the refrigerant is supplied to a narrow space (3.3 m) such as a toilet or the like2× 2.4.4 m), the maximum concentration (0.227 or less) of the multi-type air conditioner including the low-capacity indoor unit 20C at the time of refrigerant leakage is also small, and the refrigerant leakage is safer.
Further, since the low-power indoor unit 20C has a rated cooling capacity of 1.6kW or less (0.8 kW in the present embodiment), it is suitable for air conditioning in a narrow space such as a toilet and is highly safe when a refrigerant leaks in the narrow space.
Further, a multi-type air conditioner can be provided in which a plurality of indoor units including at least one low-capacity indoor unit 20C are connected to the dedicated outdoor unit 10.
In the above-described embodiment 1, the model determination unit 100C and the notification unit 100d are provided on the low-capacity indoor unit 20C side, but the model determination unit and the notification unit may be provided on the exclusive-use outdoor unit 10 side.
[ 2 nd embodiment ]
Fig. 5 is a block diagram of an indoor control device 200 of a low-capacity indoor unit 20C according to embodiment 2 of the present disclosure. The low-power indoor unit 20C according to embodiment 2 has the same configuration as the low-power indoor unit 20C according to embodiment 1, except for the indoor control device 200.
As shown in fig. 5, the low-capacity indoor unit 20C includes an indoor control device 200 including a microcomputer and an input/output circuit. The indoor control device 200 includes an operation control unit 200a, a communication unit 200b, an allowable refrigerant filling amount determination unit 200c, and a notification unit 200 d.
The operation control unit 200a controls the fan motor 21 and the damper drive unit 22 based on detection signals from the indoor temperature sensor 16C and the indoor heat exchanger temperature sensor 15C.
The communication unit 200b communicates with the outdoor control device 18 (shown in fig. 1) of the exclusive outdoor unit 10 connected to the low-capacity indoor unit 20C via the communication unit 18 b.
The allowable refrigerant filling amount determination unit 200C determines whether or not the allowable refrigerant filling amount X from the outdoor unit received by the communication unit 200b is larger than the allowable refrigerant filling amount a calculated in advance based on the rated cooling capacity of 0.8kW of the low-capacity indoor unit 20C.
In this case, for example, depending on the floor area (3.3 m) of the room to which it is applied2) And a ceiling height (2.4m), and a maximum concentration of 0.227kg/m is calculated in advance from a rated refrigerating capacity of 0.8kW of the low-capacity indoor unit 20C when the refrigerant leaks into the room of the volume3(≒1.8kg(3.3m2× 2.4.4 m)) or less.
When the allowable refrigerant filling amount determination unit 200C determines that the allowable refrigerant filling amount X from the connected outdoor unit is larger than the allowable refrigerant filling amount a calculated in advance based on the rated cooling capacity of the low-capacity indoor unit 20C, the notification unit 200d blinks the power lamp of the display unit 23 to notify an abnormality. Here, the power lamp may be caused to blink and a buzzer sound may be emitted. The means for notifying the abnormality is not limited to the power lamp or the buzzer sound, and the abnormality may be notified by a display unit, an audio output, or the like.
Fig. 6 is a flowchart illustrating the operation of the indoor control device 200.
First, the outdoor unit is connected to the low-capacity indoor unit 20C, and when the power is first turned on, the indoor control device 200 starts operating.
Then, in step S11 shown in fig. 6, it is determined whether or not the outdoor unit is connected to the low-energy indoor unit 20C, and if it is determined that the outdoor unit is connected to the low-energy indoor unit 20C, the process proceeds to step S12. On the other hand, if the outdoor unit is not connected to the low-capacity indoor unit 20C, step S11 is repeated.
Then, in step S12, the communication unit 200b obtains the allowable refrigerant filling amount X from the outdoor unit.
Next, the process proceeds to step S13, where the allowable refrigerant filling amount determination unit 200C determines whether or not the allowable refrigerant filling amount X of the outdoor unit is greater than the allowable refrigerant filling amount a calculated in advance based on the rated cooling capacity of the low-capacity indoor unit 20C.
When it is determined in step S13 that the allowable refrigerant filling amount X is larger than the allowable refrigerant filling amount a, the routine proceeds to step S15, where an abnormality is notified by the notification unit 100d, and the process is terminated. On the other hand, if it is determined in step S13 that the allowable refrigerant filling amount X is equal to or less than the allowable refrigerant filling amount a, the routine proceeds to step S14.
Then, in step S14, the cooling operation or the heating operation, which is the normal operation, is performed in accordance with a command from a remote controller or the like.
In the low-capacity indoor unit 20C configured as described above, the notification unit 200d does not notify the abnormality when the low-capacity indoor unit 20C is connected to the dedicated outdoor unit 10 by setting the allowable refrigerant filling amount X of the dedicated outdoor unit 10 to be smaller than the allowable refrigerant filling amount a calculated in advance based on the rated cooling capacity of the low-capacity indoor unit 20C. On the other hand, when an outdoor unit other than the exclusive outdoor unit 10 is connected, the notified allowable refrigerant filling amount X of the outdoor unit is larger than the allowable refrigerant filling amount a calculated in advance based on the rated cooling capacity, and therefore, the notification unit 200d notifies an abnormality.
In the above-described embodiment 2, the allowable refrigerant filling amount determination unit 200C is provided on the low-capacity indoor unit 20C side, but the allowable refrigerant filling amount determination unit may be provided on the exclusive outdoor unit 10 side.
In the above-described embodiment 1 and embodiment 2, it is determined whether or not the connected outdoor unit is the exclusive outdoor unit 10, or whether or not the allowable refrigerant filling amount X from the outdoor unit is larger than the allowable refrigerant filling amount a calculated in advance from the rated cooling capacity of the low-capacity indoor unit 20C, based on the model ID acquired from the outdoor unit, but the means for determining whether or not the connected outdoor unit is the exclusive outdoor unit that allows combination is not limited to this.
In addition, in the above-described embodiment 1 and the above-described embodiment 2, a description has been given of a multi-type air conditioner including the exclusive outdoor unit 10 and a plurality of indoor units (including the low-energy indoor unit 20C) connected to the exclusive outdoor unit 10, but an air conditioner in which the exclusive outdoor unit and the low-energy indoor unit are connected in one-to-one correspondence may be employed.
Although specific embodiments of the present disclosure have been described, the present disclosure is not limited to the above-described embodiment 1 and embodiment 2, and may be implemented with various modifications within the scope of the present disclosure.
Description of the reference symbols
1: a compressor; 2: a four-way switching valve; 3: an outdoor heat exchanger; 4A, 4B, 4C: an indoor heat exchanger; 5A, 5B, 5C: an indoor fan; 6: an accumulator; 7A, 7B, 7C: a refrigerant pipe connection section; 8A, 8B, 8C: a refrigerant pipe connection section; 10: a special outdoor unit; 11: a discharge pipe temperature sensor; 12: an outdoor heat exchanger temperature sensor; 13: an outdoor temperature sensor; 15A, 15B, 15C: an indoor heat exchanger temperature sensor; 16A, 16B, 16C: an indoor temperature sensor; 18: an outdoor control device; 18 a: an operation control unit; 18 b: a communication unit; 20A, 20B: an indoor unit; 20C: a low-capacity indoor unit; 100: an indoor control device; 100 a: an operation control unit; 100 b: a communication unit; 100 c: a model determination unit; 100 d: a notification unit; 200: an indoor control device; 200 a: an operation control unit; 200 b: a communication unit; 200 c: an allowable refrigerant filling amount determination unit; 200 d: a notification unit; EVA, EVB, EVC: an electric expansion valve.

Claims (4)

1. A low-energy indoor unit (20C) having a rated refrigerating capacity of less than 2.2kW, characterized in that,
the low-capacity indoor unit (20C) has notification units (100d, 200d) that notify an abnormality when the low-capacity indoor unit (100d, 200d) is connected to an outdoor unit other than the dedicated outdoor unit (10) that allows combination.
2. The low-energy indoor unit (20C) according to claim 1,
the rated refrigerating capacity is below 1.6 kW.
3. Low-energy indoor unit (20C) according to claim 1 or 2,
the dedicated outdoor unit (10) corresponds to a multi-type air conditioner to which a plurality of indoor units (20A, 20B, 20C) can be connected,
the low-capacity indoor unit (20C) is operable as an indoor unit of the multi-type air conditioner, and the low-capacity indoor unit (20C) is at least one of the plurality of indoor units (20A, 20B, 20C).
4. A low energy indoor unit (20C) according to any one of claims 1 to 3,
the notification unit (200d) notifies of an abnormality when the allowable refrigerant filling amount of the outdoor unit notified from the connected outdoor unit is larger than the allowable refrigerant filling amount calculated in advance based on the rated cooling capacity.
CN201980010681.0A 2018-02-23 2019-01-30 Low-capacity indoor unit Pending CN111656102A (en)

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JP2018031021A JP6853205B2 (en) 2018-02-23 2018-02-23 Low capacity indoor unit
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