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WO2021156975A1 - Air conditioning apparatus - Google Patents

Air conditioning apparatus Download PDF

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Publication number
WO2021156975A1
WO2021156975A1 PCT/JP2020/004371 JP2020004371W WO2021156975A1 WO 2021156975 A1 WO2021156975 A1 WO 2021156975A1 JP 2020004371 W JP2020004371 W JP 2020004371W WO 2021156975 A1 WO2021156975 A1 WO 2021156975A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotation speed
control unit
outdoor fan
air conditioner
compressor
Prior art date
Application number
PCT/JP2020/004371
Other languages
French (fr)
Japanese (ja)
Inventor
賢司 佐藤
瑞朗 酒井
耕一 下川
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2020/004371 priority Critical patent/WO2021156975A1/en
Priority to JP2021575159A priority patent/JP7195461B2/en
Publication of WO2021156975A1 publication Critical patent/WO2021156975A1/en

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Classifications

    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/08—Compressors specially adapted for separate outdoor units
    • F24F1/12—Vibration or noise prevention thereof
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20—Electric components for separate outdoor units
    • F24F1/24—Cooling of electric components
    • 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
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/40—Vibration or noise prevention at outdoor 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • 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

Definitions

  • the present disclosure relates to an air conditioner that controls the rotation speed of an outdoor fan.
  • Patent Document 1 when the operating frequency of the compressor provided in the outdoor unit is near the lower limit, for example, 30 Hz to 40 Hz, the rotation speed of the outdoor fan is reduced, or when there are a plurality of outdoor fans, the number of operating units is reduced.
  • a technique for reducing noise by causing the noise to be reduced is disclosed.
  • Patent Document 1 Unlike Patent Document 1, a method of quickly reducing the noise of the outdoor fan by reducing the rotation speed of the outdoor fan without changing the operating frequency of the compressor can be considered. However, if the rotation speed of the outdoor fan is reduced, the upper limit of the operating frequency of the compressor is limited at a certain stage in order to protect the compressor. In this case, there is a problem that the required air conditioning capacity of the air conditioner may be insufficient.
  • the present disclosure has been made in view of the above, and an object of the present disclosure is to obtain an air conditioner capable of reducing noise generated by an outdoor fan while ensuring the necessary air conditioning capacity.
  • the air conditioner according to the present disclosure adjusts the operating frequency, the compressor that compresses the refrigerant flowing in the refrigerant circuit, the rotation speed, and the heat of the refrigerant.
  • the outdoor fan that cools the outdoor heat exchanger to be replaced, the operating frequency of the compressor, and the rotation speed of the outdoor fan are controlled to ensure the required air conditioning capacity, while the rotation speed of the outdoor fan is preferentially lowered to a low level. It is provided with a control unit for performing noisy operation.
  • the air conditioner according to the present disclosure has the effect of being able to reduce the noise generated by the outdoor fan while ensuring the necessary air conditioning capacity.
  • FIG. 2 shows an example of a soundproofing material included in the air conditioner according to the present embodiment.
  • the figure which shows the control performed after the control part of the air conditioner which concerns on this embodiment reduces the noise of an outdoor fan.
  • FIG. 1 is a diagram showing a configuration example of the air conditioner 30 according to the present embodiment.
  • the air conditioner 30 includes an outdoor unit 31 and an indoor unit 32.
  • FIG. 1 shows the configuration of a refrigeration cycle straddling the outdoor unit 31 and the indoor unit 32 in the air conditioner 30.
  • the outdoor unit 31 includes a compressor 1, a four-way valve 2, an outdoor fan 3, an outdoor heat exchanger 4, an expansion valve 5, a pipe 7, a heat radiating plate 8, a heat radiating plate temperature sensor 9, and two outdoor units. It includes a phase tube temperature sensor 10, an outdoor liquid tube temperature sensor 11, an outside air temperature sensor 16, and a control unit 17.
  • the indoor unit 32 includes an indoor heat exchanger 6, a pipe 7, an indoor two-phase pipe temperature sensor 12, an indoor liquid pipe temperature sensor 13, an indoor set temperature storage unit 14, and an indoor suction temperature sensor 15. ..
  • the compressor 1, the four-way valve 2, the outdoor heat exchanger 4, the expansion valve 5, the heat radiating plate 8, and the indoor heat exchanger 6 are connected by a pipe 7 to form a refrigerant circuit 18. ..
  • the operating frequency of the compressor 1 is adjusted by inverter control by the control unit 17, and the refrigerant flowing in the refrigerant circuit 18 is compressed.
  • the four-way valve 2 changes the operating mode of the air conditioner 30, that is, the direction in which the refrigerant flows when switching between cooling and heating.
  • the rotation speed of the outdoor fan 3 is adjusted by the control of the control unit 17, and the outdoor heat exchanger 4 is cooled.
  • the outdoor heat exchanger 4 exchanges heat of the refrigerant as a condenser and an evaporator.
  • the expansion valve 5 reduces the pressure of the refrigerant.
  • the heat radiating plate 8 has a role of releasing heat from the control board that controls the operation of the outdoor unit 31.
  • the heat radiating plate temperature sensor 9 detects the heat radiating plate temperature, which is the temperature of the heat radiating plate 8.
  • the outdoor two-phase pipe temperature sensor 10 detects the temperature of the outdoor heat exchanger 4.
  • the outdoor liquid pipe temperature sensor 11 detects the temperature of the liquid refrigerant.
  • the outside air temperature sensor 16 detects the outside air temperature around the outdoor unit 31.
  • the control unit 17 controls the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3, secures the necessary air conditioning capacity of the air conditioner 30, and preferentially lowers the rotation speed of the outdoor fan 3 to reduce noise. Carry out the operation.
  • the control unit 17 may be mounted on the control board described above.
  • the indoor heat exchanger 6 exchanges heat of the refrigerant as a condenser and an evaporator.
  • the indoor two-phase pipe temperature sensor 12 detects the temperature of the indoor heat exchanger 6.
  • the indoor liquid pipe temperature sensor 13 detects the temperature of the liquid refrigerant.
  • the indoor set temperature storage unit 14 stores a desired set temperature for the air conditioner 30 set by the user by a remote controller or the like (not shown).
  • the indoor suction temperature sensor 15 detects the indoor suction temperature near the suction port of the indoor unit 32.
  • the air conditioner 30 may include a soundproofing material 19 that is directly wound around the compressor 1 as shown in FIG. 2, or has the compressor 1 as shown in FIG.
  • a soundproofing material 20 of a type that is mounted along the machine room may be provided.
  • FIG. 2 is a diagram showing an example of a soundproofing material 19 included in the air conditioner 30 according to the present embodiment.
  • FIG. 3 is a diagram showing an example of a soundproofing material 20 included in the air conditioner 30 according to the present embodiment.
  • FIG. 3A shows a state in which the outdoor unit 31 is not equipped with the soundproofing material 20 as a comparative example
  • FIG. 3B shows a state in which the outdoor unit 31 is equipped with the soundproofing material 20.
  • FIG. 4 is a diagram showing a required capacity line set by the control unit 17 of the air conditioner 30 according to the present embodiment.
  • the horizontal axis represents the operating frequency of the compressor 1
  • the vertical axis represents the rotation speed of the outdoor fan 3.
  • the required capacity line defines the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 in order to secure the required air conditioning capacity in the air conditioner 30.
  • the content of the required capacity line differs depending on the operating mode of the air conditioner 30 and the conditions of the outside air temperature.
  • K1 indicates a cooling rated capacity line which is a required capacity line under a cooling rated condition
  • K2 indicates a heating rated capacity line which is a required capacity line under a heating rated condition.
  • K3 indicates a cooling high outside air capacity line which is a required capacity line under a cooling high outside air condition
  • K4 indicates a heating low outside air capacity line which is a required capacity line under a heating low outside air condition
  • K5 indicates a cooling low outside air capacity line which is a required capacity line under a cooling low outside air condition
  • K6 indicates a heating high outside air capacity line which is a required capacity line under a heating high outside air condition.
  • the control unit 17 uses the coefficient for each condition of the outside air temperature set in the storage area in advance, the operating frequency of the compressor 1 based on the outside air temperature, and the maximum rotation speed of the outdoor fan for the required capacity line of each condition, and uses the outdoor fan.
  • the operating frequency of the compressor 1 for each rotation speed of 3 is calculated and set by the following equation (1).
  • the coefficient for each outside air temperature condition and the operating frequency of the compressor 1 based on the outside air temperature were obtained by, for example, a user or the manufacturer of the air conditioner 30 by an actual machine test under each outside air temperature condition. Determined based on the measured value.
  • Operating frequency of compressor 1 coefficient for each outside air temperature condition x (outdoor fan rotation speed-maximum outdoor fan rotation speed) + operating frequency of compressor 1 for each outside air temperature condition ... (1)
  • FIG. 5 is a flowchart showing an operation in which the control unit 17 of the air conditioner 30 according to the present embodiment determines the required capacity line according to the operation mode of the air conditioner 30 and the outside air temperature.
  • the low outside air cooling threshold value, the high outside air cooling threshold value, the low outside air heating threshold value, and the high outside air heating threshold value are obtained from the test results conducted in advance by the user or the manufacturer of the air conditioner 30. It is assumed that each threshold value is determined and set in the control unit 17.
  • the control unit 17 determines whether the operation mode of the air conditioner 30 is cooling or heating (step S101). In the case of cooling (step S101: Yes), the control unit 17 compares the outside air temperature with the low outside air cooling threshold value (step S102). When the outside air temperature ⁇ the low outside air cooling threshold value (step S102: Yes), the control unit 17 sets the cooling low outside air capacity line K5 as the required capacity line (step S103). When the low outside air cooling threshold value ⁇ outside air temperature (step S102: No), the control unit 17 compares the outside air temperature with the high outside air cooling threshold value (step S104).
  • step S104 When the low outside air cooling threshold value ⁇ outside air temperature ⁇ high outside air cooling threshold value (step S104: Yes), the control unit 17 sets the cooling rated capacity line K1 as the required capacity line (step S105). When the high outside air cooling threshold value ⁇ outside air temperature (step S104: No), the control unit 17 sets the cooling high outside air capacity line K3 as the required capacity line (step S106).
  • step S101: No the control unit 17 compares the outside air temperature with the low outside air heating threshold value (step S107).
  • the control unit 17 sets the heating low outside air capacity line K4 as the required capacity line (step S108).
  • the control unit 17 compares the outside air temperature with the high outside air heating threshold value (step S109).
  • the control unit 17 sets the heating rated capacity line K2 as the required capacity line (step S110).
  • the control unit 17 sets the heating high outside air capacity line K6 as the required capacity line (step S111).
  • FIG. 6 is a diagram showing transitions between the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 by the control unit 17 of the air conditioner 30 according to the present embodiment.
  • the required capacity line of L1 shown in FIG. 6 is the cooling rated capacity line K1. Become.
  • FIG. 6 shows the relationship between the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 and the magnitude of the noise value. Since the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 are both high in the region F1, the region F1 is a region in which the noise value is large. In the region F2, the operating frequency of the compressor 1 is low, but the rotation speed of the outdoor fan 3 is high, so that the noise level is in a medium region. In the region F3, the operating frequency of the compressor 1 is high, but the noise is reduced by the soundproofing materials 19, 20, etc., and the rotation speed of the outdoor fan 3 is a little low. Become.
  • the region F4 is a region where the noise value is small because the operating frequency of the compressor 1 is low and the rotation speed of the outdoor fan 3 is also slightly low.
  • the rotation speed of the outdoor fan 3 is low, but the operating frequency of the compressor 1 is high, so that the noise level is in a medium region. Since the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 are both low in the region F6, the noise level is in a small region.
  • L2 indicates the timing point at which the air conditioner 30 enters steady operation, that is, the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3.
  • the control unit 17 does not perform control for noise reduction for a certain period of time after the start of the air conditioner 30, but starts control for noise reduction at the timing of entering steady operation. .. This is because the air conditioner 30 performs a predetermined control so as not to deviate from the safe operation range at the initial stage of starting the compressor 1.
  • the control unit 17 controls to change, that is, decrease the rotation speed of the outdoor fan 3 as shown in L3 when the air conditioner 30 enters the steady operation with L2 as the start point.
  • the control unit 17 determines the change in the rotation speed of the outdoor fan 3 shown in L3 by using the heat radiating plate temperature detected by the heat radiating plate temperature sensor 9 and the condensation temperature.
  • the condensation temperature is set to the higher temperature of the temperatures detected by the outdoor two-phase pipe temperature sensor 10 and the outdoor liquid pipe temperature sensor 11 when the operation mode of the air conditioner 30 is cooling. Further, the condensation temperature is set to the higher temperature of the temperatures detected by the indoor two-phase pipe temperature sensor 12 and the indoor liquid pipe temperature sensor 13 when the operation mode of the air conditioner 30 is heating. That is, the condensation temperature is the temperature detected by the temperature sensor installed in the indoor unit 32 or the outdoor unit 31 defined by the operation mode of the air conditioner 30.
  • FIG. 7 is a flowchart showing the control of the rotation speed of the outdoor fan 3 by using the heat radiating plate temperature by the control unit 17 of the air conditioner 30 according to the present embodiment.
  • the first fan rotation speed down threshold value and the first fan rotation speed up threshold value are determined from the test results conducted in advance by the user, the manufacturer of the air conditioner 30, or the like. It is assumed that the control unit 17 is set.
  • the control unit 17 compares the heat dissipation plate temperature with the first fan speed down threshold (step S201).
  • step S201: Yes the control unit 17 determines that the first fan speed down state (step S202).
  • step S201: No the control unit 17 compares the heat dissipation plate temperature with the first fan rotation speed up threshold value (step S203).
  • step S203: Yes the control unit 17 determines that the first fan rotation speed maintenance state is maintained (step S204). ..
  • the control unit 17 determines that the first fan rotation speed increase state (step S205). At this point, the control unit 17 does not change the rotation speed of the outdoor fan 3.
  • FIG. 8 is a flowchart showing the control of the rotation speed of the outdoor fan 3 using the condensation temperature by the control unit 17 of the air conditioner 30 according to the present embodiment.
  • the second fan rotation speed down threshold value and the second fan rotation speed up threshold value are determined from the test results conducted in advance by the user, the manufacturer of the air conditioner 30, or the like. It is assumed that the control unit 17 is set.
  • the control unit 17 compares the condensation temperature with the second fan speed down threshold (step S301). When the condensation temperature ⁇ the second fan speed down threshold value (step S301: Yes), the control unit 17 determines that the second fan speed down state (step S302).
  • step S301 When the second fan rotation speed down threshold value ⁇ condensation temperature (step S301: No), the control unit 17 compares the condensation temperature with the second fan rotation speed up threshold value (step S303). When the second fan rotation speed down threshold value ⁇ condensation temperature ⁇ second fan rotation speed up threshold value (step S303: Yes), the control unit 17 determines that the second fan rotation speed maintenance state is maintained (step S304). When the second fan rotation speed increase threshold value ⁇ condensation temperature (step S303: No), the control unit 17 determines that the second fan rotation speed increase state (step S305).
  • FIG. 9 shows the determination result of the first fan rotation speed down state, the first fan rotation speed maintenance state, or the first fan rotation speed up state obtained by the control unit 17 using the heat radiation plate temperature.
  • the determination result of the second fan rotation speed down state, the second fan rotation speed maintenance state, or the second fan rotation speed up state obtained by fitting and condensing temperature is applied to FIG.
  • FIG. 9 is a diagram showing control of the rotation speed of the outdoor fan 3 based on the heat radiating plate temperature and the condensation temperature by the control unit 17 of the air conditioner 30 according to the present embodiment. From the result of applying each determination result to FIG. 9, the control unit 17 determines to reduce the fan rotation speed, maintain the fan rotation speed, or increase the fan rotation speed.
  • FIG. 9 shows the determination result of the first fan rotation speed down state, the first fan rotation speed maintenance state, or the first fan rotation speed up state obtained by the control unit 17 using the heat radiation plate temperature.
  • the fan speed is down. Further, in the case of the first fan rotation speed up state or the second fan rotation speed up state, and in the case of the first fan rotation speed up state and the second fan rotation speed up state, the fan rotation speed is increased. In other cases, the fan speed is maintained.
  • the control unit 17 reduces the upper limit value of the rotation speed of the outdoor fan 3 by a specified number. In the case of maintaining the fan rotation speed, the control unit 17 maintains the current upper limit value of the rotation speed of the outdoor fan 3.
  • the control unit 17 increases the upper limit value of the rotation speed of the outdoor fan 3 by a specified number.
  • the control unit 17 realizes a change in the rotation speed of the outdoor fan 3 shown in L3 of FIG. 6 by the operations shown in FIGS. 7 to 9.
  • the control unit 17 repeatedly performs the operations shown in FIGS. 7 to 9 at predetermined time intervals.
  • the control unit 17 reduces the upper limit of the rotation speed of the outdoor fan 3 by the operation of L3 in FIG. 6, the limit for preventing overheating of the condensation temperature works as in L4 shown in FIG. 6, and the compressor 1 is operated. Decrease the frequency.
  • the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 are stabilized at the point L5 when the required capacity line of L1 is reached. ..
  • FIG. 10 is a diagram showing a change in noise value due to the outdoor fan 3 in the air conditioner 30 according to the present embodiment.
  • the horizontal axis represents time and the vertical axis represents noise value.
  • the broken line of P1 shows the transition of the noise value under the control of Patent Document 1 as a comparative example
  • P2 shows the transition of the noise value of the air conditioner 30 under the control of the control unit 17 of the present embodiment.
  • the region of P3 shows the difference in noise value. It can be seen that in P2, that is, in the present embodiment, the rotation speed of the outdoor fan 3 is rapidly reduced to shorten the time when the noise value is high.
  • FIG. 11 is a diagram showing control performed after the control unit 17 of the air conditioner 30 according to the present embodiment reduces the noise of the outdoor fan 3.
  • the control unit 17 determines that the air conditioning capacity is necessary at the point L5
  • the control unit 17 increases the operating frequency of the compressor 1 as shown in Q1.
  • the control unit 17 determines the change in the rotation speed of the outdoor fan 3 as described above, and changes the rotation speed of the outdoor fan 3 as shown in Q2.
  • the control unit 17 reduces the operating frequency of the compressor 1 as shown in Q3 by limiting the prevention of overheating of the condensation temperature.
  • the control unit 17 determines the change in the rotation speed of the outdoor fan 3 as the operating frequency of the compressor 1 decreases, and changes the rotation speed of the outdoor fan 3 as shown in Q4. As shown in FIG. 11, the control unit 17 changes the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 in the vicinity of the required capacity line to harmonize the air with the minimum necessary rotation speed of the outdoor fan 3. The operation of the device 30 can be continued. In this way, the control unit 17 changes the upper limit rotation speed of the outdoor fan 3 based on the outdoor heat radiation plate temperature and the condensation temperature, and controls the rotation speed of the outdoor fan 3. The control unit 17 reduces the operating frequency of the compressor 1 when the upper limit rotation speed of the outdoor fan 3 is reduced.
  • FIG. 12 is a flowchart showing a determination of whether or not a required capacity line is necessary by the control unit 17 of the air conditioner 30 according to the present embodiment.
  • the control unit 17 calculates the absolute value ⁇ Tj of the difference between the indoor set temperature stored in the indoor set temperature storage unit 14 and the indoor suction temperature detected by the indoor suction temperature sensor 15 (step S401).
  • the control unit 17 stores the calculated absolute value ⁇ Tj of the difference.
  • the control unit 17 calculates the difference ⁇ Fj between the absolute value ⁇ Tj of the difference one minute ago and the absolute value ⁇ Tj of the current difference (step S402).
  • ⁇ Fj> 0 step S403: Yes
  • the control unit 17 determines that the air conditioning capacity is necessary and sets the required capacity line (step S404).
  • the method of setting the required capacity line is as described above.
  • ⁇ Fj ⁇ 0 step S403: No
  • the control unit 17 determines that the air conditioning capacity is not required and does not set the required capacity line (step S405).
  • control unit 17 determines whether or not the required capacity line is set from the difference between the indoor set temperature and the indoor suction temperature of the indoor unit 32.
  • the control unit 17 sets the required capacity line based on the operation mode of the air conditioner 30 and the outside air temperature.
  • the control unit 17 controls the compressor 1 so that the operating frequency is equal to or higher than the operating frequency specified by the required capacity line, and controls the outdoor fan 3 so that the rotation speed is equal to or higher than the rotation speed specified by the required capacity line.
  • FIG. 13 is a diagram showing transitions between the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 when the control unit 17 of the air conditioner 30 according to the present embodiment determines that the air conditioning capacity is not required.
  • the control unit 17 does not set the lower limit value according to the required capacity line of L1, so that the rotation speed of the outdoor fan 3 is reduced with L5 as the initial point as shown in R2, and further shown in R3.
  • the operating frequency of the compressor 1 can be reduced.
  • FIG. 14 is a diagram showing a transition of the operating frequency of the compressor 1 when the control unit 17 of the air conditioner 30 according to the present embodiment determines that the air conditioning capacity is not required and then determines that the air conditioning capacity is required. ..
  • the control unit 17 sets the lower limit of the operating frequency of the compressor 1 on the required capacity line L1 and sets the required capacity as shown in R5.
  • the operating frequency of the compressor 1 is changed, that is, increased so as to exceed the lower limit value indicated by the line L1.
  • the control unit 17 changes the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 as shown in FIG.
  • control unit 17 does not operate due to excessive air conditioning capacity when the air conditioning capacity is not required, and air conditioning with the minimum required air conditioning capacity.
  • the device 30 can be operated.
  • FIG. 15 is a diagram showing an example of a hardware configuration that realizes the control unit 17 included in the air conditioner 30 according to the present embodiment.
  • the control unit 17 is realized by the processor 201 and the memory 202.
  • the processor 201 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP (Digital Signal Processor)), or system LSI (Large Scale Integration).
  • the memory 202 is non-volatile or volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EEPROM (Erasable Programmable Read Only Memory), EEPROM (registered trademark) (Electrically Erasable Programmable Read-Only Memory).
  • the semiconductor memory of the above can be illustrated.
  • the memory 202 is not limited to these, and may be a magnetic disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc).
  • the control unit 17 preferentially reduces the rotation speed of the outdoor fan 3, and the noise level is large as in the region F1 shown in FIG. By controlling so as not to stay in the area, the noise of the outdoor fan 3 can be reduced. At this time, the control unit 17 sets the required capacity line as needed. The control unit 17 operates the air conditioner 30 so that the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 do not fall below the required capacity line, so that the air conditioning capacity is insufficient due to the priority given to low noise. It can be avoided.
  • the configuration shown in the above embodiments is an example, and can be combined with another known technique, can be combined with each other, and does not deviate from the gist. It is also possible to omit or change a part of the configuration.
  • 1 Compressor 2 4-way valve, 3 outdoor fan, 4 outdoor heat exchanger, 5 expansion valve, 6 indoor heat exchanger, 7 piping, 8 heat dissipation plate, 9 heat dissipation plate temperature sensor, 10 outdoor two-phase pipe temperature sensor, 11 Outdoor liquid pipe temperature sensor, 12 indoor two-phase pipe temperature sensor, 13 indoor liquid pipe temperature sensor, 14 indoor set temperature storage unit, 15 indoor suction temperature sensor, 16 outdoor air temperature sensor, 17 control unit, 18 refrigerant circuit, 19, 20 Soundproofing material, 30 air conditioner, 31 outdoor unit, 32 indoor unit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The present invention comprises: a compressor (1) that adjusts an operating frequency and compresses a refrigerant flowing in a refrigerant circuit (18); an outdoor fan (3) that adjusts the number of rotations and refrigerates an outdoor heat exchanger (4) for performing heat exchange of the refrigerant; and a control unit (17) that preferentially reduces the number of rotations of the outdoor fan (3) while ensuring required air conditioning ability by controlling the operating frequency of the compressor (1) and the number of rotations of the outdoor fan (3) to thereby execute low noise operation.

Description

空気調和装置Air conditioner
　本開示は、室外ファンの回転数を制御する空気調和装置に関する。 The present disclosure relates to an air conditioner that controls the rotation speed of an outdoor fan.
　従来、空気調和装置において、室外ファンで発生する騒音を低減することが行われている。特許文献１には、室外機が備える圧縮機の運転周波数が下限域付近、例えば、３０Ｈｚ～４０Ｈｚの場合に、室外ファンの回転数を減少させる、または室外ファンが複数あるときは稼働台数を減少させることによって、騒音を低減させる技術が開示されている。 Conventionally, in an air conditioner, noise generated by an outdoor fan has been reduced. According to Patent Document 1, when the operating frequency of the compressor provided in the outdoor unit is near the lower limit, for example, 30 Hz to 40 Hz, the rotation speed of the outdoor fan is reduced, or when there are a plurality of outdoor fans, the number of operating units is reduced. A technique for reducing noise by causing the noise to be reduced is disclosed.
実開昭６４－２５６５８号公報Jitsukaisho 64-25658
　しかしながら、上記従来の技術によれば、圧縮機の運転周波数が下限域付近になるまでに室外ファンの回転数を減少させることは記載されていない。そのため、圧縮機の運転周波数が下限域付近になるまでは、室外ファンの回転数が高い状態が維持され、室外ファンによる騒音の大きい状態が継続する、という問題があった。 However, according to the above-mentioned conventional technique, it is not described that the rotation speed of the outdoor fan is reduced until the operating frequency of the compressor approaches the lower limit range. Therefore, there is a problem that the rotation speed of the outdoor fan is maintained high and the noise generated by the outdoor fan continues until the operating frequency of the compressor approaches the lower limit range.
　特許文献１と異なり、圧縮機の運転周波数を変化させることなく、室外ファンの回転数を減少させることで、室外ファンの騒音を迅速に低減する方法が考えられる。しかしながら、室外ファンの回転数を減少させていくと、ある段階で、圧縮機の保護のため、圧縮機の運転周波数の上限値が制限されてしまう。この場合、空気調和装置において、必要な空調能力が不足してしまう可能性がある、という問題があった。 Unlike Patent Document 1, a method of quickly reducing the noise of the outdoor fan by reducing the rotation speed of the outdoor fan without changing the operating frequency of the compressor can be considered. However, if the rotation speed of the outdoor fan is reduced, the upper limit of the operating frequency of the compressor is limited at a certain stage in order to protect the compressor. In this case, there is a problem that the required air conditioning capacity of the air conditioner may be insufficient.
　本開示は、上記に鑑みてなされたものであって、必要な空調能力を確保しつつ、室外ファンで発生する騒音を低減可能な空気調和装置を得ることを目的とする。 The present disclosure has been made in view of the above, and an object of the present disclosure is to obtain an air conditioner capable of reducing noise generated by an outdoor fan while ensuring the necessary air conditioning capacity.
　上述した課題を解決し、目的を達成するために、本開示に係る空気調和装置は、運転周波数を調整し、冷媒回路に流れる冷媒を圧縮する圧縮機と、回転数を調整し、冷媒の熱交換を行う室外熱交換器を冷却する室外ファンと、圧縮機の運転周波数および室外ファンの回転数を制御し、必要な空調能力を確保しつつ、室外ファンの回転数を優先的に下げて低騒音運転を実施する制御部と、を備える。 In order to solve the above-mentioned problems and achieve the object, the air conditioner according to the present disclosure adjusts the operating frequency, the compressor that compresses the refrigerant flowing in the refrigerant circuit, the rotation speed, and the heat of the refrigerant. The outdoor fan that cools the outdoor heat exchanger to be replaced, the operating frequency of the compressor, and the rotation speed of the outdoor fan are controlled to ensure the required air conditioning capacity, while the rotation speed of the outdoor fan is preferentially lowered to a low level. It is provided with a control unit for performing noisy operation.
　本開示に係る空気調和装置は、必要な空調能力を確保しつつ、室外ファンで発生する騒音を低減できる、という効果を奏する。 The air conditioner according to the present disclosure has the effect of being able to reduce the noise generated by the outdoor fan while ensuring the necessary air conditioning capacity.
本実施の形態に係る空気調和装置の構成例を示す図The figure which shows the structural example of the air conditioner which concerns on this embodiment. 本実施の形態に係る空気調和装置が備える防音材の例を示す第１の図The first figure which shows the example of the soundproof material provided in the air conditioner which concerns on this embodiment. 本実施の形態に係る空気調和装置が備える防音材の例を示す第２の図FIG. 2 shows an example of a soundproofing material included in the air conditioner according to the present embodiment. 本実施の形態に係る空気調和装置の制御部が設定する必要能力ラインを示す図The figure which shows the required capacity line set by the control part of the air conditioner which concerns on this embodiment. 本実施の形態に係る空気調和装置の制御部が空気調和装置の運転モードおよび外気温度によって必要能力ラインを決定する動作を示すフローチャートA flowchart showing an operation in which the control unit of the air conditioner according to the present embodiment determines the required capacity line according to the operation mode of the air conditioner and the outside air temperature. 本実施の形態に係る空気調和装置の制御部による圧縮機の運転周波数および室外ファンの回転数の遷移を示す図The figure which shows the transition of the operation frequency of the compressor and the rotation speed of an outdoor fan by the control part of the air conditioner which concerns on this embodiment. 本実施の形態に係る空気調和装置の制御部による放熱板温度を用いた室外ファンの回転数の制御を示すフローチャートA flowchart showing the control of the rotation speed of the outdoor fan using the heat radiating plate temperature by the control unit of the air conditioner according to the present embodiment. 本実施の形態に係る空気調和装置の制御部による凝縮温度を用いた室外ファンの回転数の制御をフローチャートFlow chart of control of the rotation speed of the outdoor fan using the condensation temperature by the control unit of the air conditioner according to the present embodiment. 本実施の形態に係る空気調和装置の制御部による放熱板温度および凝縮温度に基づく室外ファンの回転数の制御を示す図The figure which shows the control of the rotation speed of an outdoor fan based on the heat dissipation plate temperature and the condensation temperature by the control part of the air conditioner which concerns on this embodiment. 本実施の形態に係る空気調和装置での室外ファンによる騒音値の変化を示す図The figure which shows the change of the noise level by the outdoor fan in the air conditioner which concerns on this embodiment. 本実施の形態に係る空気調和装置の制御部が室外ファンの騒音を低減させた後に行う制御を示す図The figure which shows the control performed after the control part of the air conditioner which concerns on this embodiment reduces the noise of an outdoor fan. 本実施の形態に係る空気調和装置の制御部による必要能力ラインの必要有無の判定を示すフローチャートA flowchart showing the determination of whether or not the required capacity line is necessary by the control unit of the air conditioner according to the present embodiment. 本実施の形態に係る空気調和装置の制御部において空調能力が必要無いと判定したときの圧縮機の運転周波数および室外ファンの回転数の遷移を示す図The figure which shows the transition of the operation frequency of a compressor and the rotation speed of an outdoor fan when it is judged that the air conditioning capacity is not necessary in the control part of the air conditioner which concerns on this embodiment. 本実施の形態に係る空気調和装置の制御部において空調能力が必要無いと判定した後に空調能力が必要と判定したときの圧縮機の運転周波数の遷移を示す図The figure which shows the transition of the operating frequency of a compressor when it is determined that the air conditioning capacity is necessary after it is determined that the air conditioning capacity is not necessary in the control part of the air conditioner which concerns on this embodiment. 本実施の形態に係る空気調和装置が備える制御部を実現するハードウェア構成の一例を示す図The figure which shows an example of the hardware configuration which realizes the control part provided in the air conditioner which concerns on this embodiment.
　以下に、本開示の実施の形態に係る空気調和装置を図面に基づいて詳細に説明する。なお、この実施の形態によりこの開示が限定されるものではない。 The air conditioner according to the embodiment of the present disclosure will be described in detail below with reference to the drawings. It should be noted that this embodiment does not limit this disclosure.
実施の形態．
　図１は、本実施の形態に係る空気調和装置３０の構成例を示す図である。空気調和装置３０は、室外機３１と、室内機３２と、を備える。図１は、具体的には、空気調和装置３０において、室外機３１および室内機３２に跨る冷凍サイクルの構成を示している。室外機３１は、圧縮機１と、四方弁２と、室外ファン３と、室外熱交換器４と、膨張弁５と、配管７と、放熱板８と、放熱板温度センサ９と、室外二相管温度センサ１０と、室外液管温度センサ１１と、外気温度センサ１６と、制御部１７と、を備える。室内機３２は、室内熱交換器６と、配管７と、室内二相管温度センサ１２と、室内液管温度センサ１３と、室内設定温度記憶部１４と、室内吸い込み温度センサ１５と、を備える。空気調和装置３０では、圧縮機１、四方弁２、室外熱交換器４、膨張弁５、放熱板８、および室内熱交換器６が、配管７によって接続され、冷媒回路１８を構成している。 Embodiment.
FIG. 1 is a diagram showing a configuration example of the air conditioner 30 according to the present embodiment. The air conditioner 30 includes an outdoor unit 31 and an indoor unit 32. Specifically, FIG. 1 shows the configuration of a refrigeration cycle straddling the outdoor unit 31 and the indoor unit 32 in the air conditioner 30. The outdoor unit 31 includes a compressor 1, a four-way valve 2, an outdoor fan 3, an outdoor heat exchanger 4, an expansion valve 5, a pipe 7, a heat radiating plate 8, a heat radiating plate temperature sensor 9, and two outdoor units. It includes a phase tube temperature sensor 10, an outdoor liquid tube temperature sensor 11, an outside air temperature sensor 16, and a control unit 17. The indoor unit 32 includes an indoor heat exchanger 6, a pipe 7, an indoor two-phase pipe temperature sensor 12, an indoor liquid pipe temperature sensor 13, an indoor set temperature storage unit 14, and an indoor suction temperature sensor 15. .. In the air conditioner 30, the compressor 1, the four-way valve 2, the outdoor heat exchanger 4, the expansion valve 5, the heat radiating plate 8, and the indoor heat exchanger 6 are connected by a pipe 7 to form a refrigerant circuit 18. ..
　圧縮機１は、制御部１７によるインバータ制御によって運転周波数が調整され、冷媒回路１８に流れる冷媒を圧縮する。四方弁２は、空気調和装置３０の運転モード、すなわち冷房および暖房の切り替え時に冷媒の流れる方向を変化させる。室外ファン３は、制御部１７の制御によって回転数が調整され、室外熱交換器４を冷却する。室外熱交換器４は、凝縮器および蒸発器として冷媒の熱交換を行う。膨張弁５は、冷媒の圧力を減少させる。放熱板８は、室外機３１の動作を制御する制御基板の熱を放出する役割を持つ。放熱板温度センサ９は、放熱板８の温度である放熱板温度を検知する。室外二相管温度センサ１０は、室外熱交換器４の温度を検知する。室外液管温度センサ１１は、液冷媒の温度を検知する。外気温度センサ１６は、室外機３１の周辺の外気温度を検知する。制御部１７は、圧縮機１の運転周波数および室外ファン３の回転数を制御し、空気調和装置３０の必要な空調能力を確保しつつ、室外ファン３の回転数を優先的に下げて低騒音運転を実施する。制御部１７は、前述の制御基板に搭載されていてもよい。 The operating frequency of the compressor 1 is adjusted by inverter control by the control unit 17, and the refrigerant flowing in the refrigerant circuit 18 is compressed. The four-way valve 2 changes the operating mode of the air conditioner 30, that is, the direction in which the refrigerant flows when switching between cooling and heating. The rotation speed of the outdoor fan 3 is adjusted by the control of the control unit 17, and the outdoor heat exchanger 4 is cooled. The outdoor heat exchanger 4 exchanges heat of the refrigerant as a condenser and an evaporator. The expansion valve 5 reduces the pressure of the refrigerant. The heat radiating plate 8 has a role of releasing heat from the control board that controls the operation of the outdoor unit 31. The heat radiating plate temperature sensor 9 detects the heat radiating plate temperature, which is the temperature of the heat radiating plate 8. The outdoor two-phase pipe temperature sensor 10 detects the temperature of the outdoor heat exchanger 4. The outdoor liquid pipe temperature sensor 11 detects the temperature of the liquid refrigerant. The outside air temperature sensor 16 detects the outside air temperature around the outdoor unit 31. The control unit 17 controls the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3, secures the necessary air conditioning capacity of the air conditioner 30, and preferentially lowers the rotation speed of the outdoor fan 3 to reduce noise. Carry out the operation. The control unit 17 may be mounted on the control board described above.
　室内熱交換器６は、凝縮器および蒸発器として冷媒の熱交換を行う。室内二相管温度センサ１２は、室内熱交換器６の温度を検知する。室内液管温度センサ１３は、液冷媒の温度を検知する。室内設定温度記憶部１４は、図示しないリモートコントローラなどによってユーザから設定された空気調和装置３０に対する所望の設定温度を記憶する。室内吸い込み温度センサ１５は、室内機３２の吸い込み口付近の室内吸い込み温度を検知する。 The indoor heat exchanger 6 exchanges heat of the refrigerant as a condenser and an evaporator. The indoor two-phase pipe temperature sensor 12 detects the temperature of the indoor heat exchanger 6. The indoor liquid pipe temperature sensor 13 detects the temperature of the liquid refrigerant. The indoor set temperature storage unit 14 stores a desired set temperature for the air conditioner 30 set by the user by a remote controller or the like (not shown). The indoor suction temperature sensor 15 detects the indoor suction temperature near the suction port of the indoor unit 32.
　空気調和装置３０は、圧縮機１の騒音対策として、図２に示すように圧縮機１に直接巻くタイプの防音材１９を備えていてもよいし、図３に示すように圧縮機１のある機械室内に沿って装着するタイプの防音材２０を備えていてもよい。図２は、本実施の形態に係る空気調和装置３０が備える防音材１９の例を示す図である。図３は、本実施の形態に係る空気調和装置３０が備える防音材２０の例を示す図である。図３（ａ）は、比較例として室外機３１が防音材２０を装着していない状態を示し、図３（ｂ）は、室外機３１が防音材２０を装着した状態を示している。 As a noise countermeasure for the compressor 1, the air conditioner 30 may include a soundproofing material 19 that is directly wound around the compressor 1 as shown in FIG. 2, or has the compressor 1 as shown in FIG. A soundproofing material 20 of a type that is mounted along the machine room may be provided. FIG. 2 is a diagram showing an example of a soundproofing material 19 included in the air conditioner 30 according to the present embodiment. FIG. 3 is a diagram showing an example of a soundproofing material 20 included in the air conditioner 30 according to the present embodiment. FIG. 3A shows a state in which the outdoor unit 31 is not equipped with the soundproofing material 20 as a comparative example, and FIG. 3B shows a state in which the outdoor unit 31 is equipped with the soundproofing material 20.
　図４は、本実施の形態に係る空気調和装置３０の制御部１７が設定する必要能力ラインを示す図である。図４において、横軸は圧縮機１の運転周波数を示し、縦軸は室外ファン３の回転数を示す。必要能力ラインとは、空気調和装置３０において必要な空調能力を確保するために圧縮機１の運転周波数および室外ファン３の回転数が規定されたものである。必要能力ラインは、空気調和装置３０の運転モードおよび外気温度の各条件によって内容が異なる。図４の例では、Ｋ１は冷房定格条件における必要能力ラインである冷房定格能力ラインを示し、Ｋ２は暖房定格条件における必要能力ラインである暖房定格能力ラインを示している。また、Ｋ３は冷房高外気条件における必要能力ラインである冷房高外気能力ラインを示し、Ｋ４は暖房低外気条件における必要能力ラインである暖房低外気能力ラインを示している。また、Ｋ５は冷房低外気条件における必要能力ラインである冷房低外気能力ラインを示し、Ｋ６は暖房高外気条件における必要能力ラインである暖房高外気能力ラインを示している。 FIG. 4 is a diagram showing a required capacity line set by the control unit 17 of the air conditioner 30 according to the present embodiment. In FIG. 4, the horizontal axis represents the operating frequency of the compressor 1, and the vertical axis represents the rotation speed of the outdoor fan 3. The required capacity line defines the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 in order to secure the required air conditioning capacity in the air conditioner 30. The content of the required capacity line differs depending on the operating mode of the air conditioner 30 and the conditions of the outside air temperature. In the example of FIG. 4, K1 indicates a cooling rated capacity line which is a required capacity line under a cooling rated condition, and K2 indicates a heating rated capacity line which is a required capacity line under a heating rated condition. Further, K3 indicates a cooling high outside air capacity line which is a required capacity line under a cooling high outside air condition, and K4 indicates a heating low outside air capacity line which is a required capacity line under a heating low outside air condition. Further, K5 indicates a cooling low outside air capacity line which is a required capacity line under a cooling low outside air condition, and K6 indicates a heating high outside air capacity line which is a required capacity line under a heating high outside air condition.
　制御部１７は、各条件の必要能力ラインについて、予め記憶領域に設定した外気温度の条件毎の係数、外気温度に基づく圧縮機１の運転周波数、および室外ファン最大回転数を用いて、室外ファン３の各回転数に対する圧縮機１の運転周波数を次の式（１）によって算出して設定する。外気温度の条件毎の係数、および外気温度に基づく圧縮機１の運転周波数については、例えば、ユーザまたは空気調和装置３０の製造者などが、各外気温度の条件下での実機試験によって得られた実測値に基づいて決定する。 The control unit 17 uses the coefficient for each condition of the outside air temperature set in the storage area in advance, the operating frequency of the compressor 1 based on the outside air temperature, and the maximum rotation speed of the outdoor fan for the required capacity line of each condition, and uses the outdoor fan. The operating frequency of the compressor 1 for each rotation speed of 3 is calculated and set by the following equation (1). The coefficient for each outside air temperature condition and the operating frequency of the compressor 1 based on the outside air temperature were obtained by, for example, a user or the manufacturer of the air conditioner 30 by an actual machine test under each outside air temperature condition. Determined based on the measured value.
　圧縮機１の運転周波数＝外気温度の条件毎の係数×（室外ファン回転数－室外ファン最大回転数）＋外気温度の条件毎の圧縮機１の運転周波数　…（１） Operating frequency of compressor 1 = coefficient for each outside air temperature condition x (outdoor fan rotation speed-maximum outdoor fan rotation speed) + operating frequency of compressor 1 for each outside air temperature condition ... (1)
　制御部１７が、空気調和装置３０の運転モードおよび外気温度センサ１６で検知された外気温度によって必要能力ラインを決定する方法について説明する。空気調和装置３０の運転モードについては、一例として、冷房および暖房の２つとする。図５は、本実施の形態に係る空気調和装置３０の制御部１７が空気調和装置３０の運転モードおよび外気温度によって必要能力ラインを決定する動作を示すフローチャートである。なお、図５に示すフローチャートにおいて、低外気冷房閾値、高外気冷房閾値、低外気暖房閾値、および高外気暖房閾値については、ユーザまたは空気調和装置３０の製造者などが、予め実施した試験結果から各閾値を決定し、制御部１７に設定されているものとする。 The method in which the control unit 17 determines the required capacity line based on the operation mode of the air conditioner 30 and the outside air temperature detected by the outside air temperature sensor 16 will be described. As an example, there are two operation modes of the air conditioner 30: cooling and heating. FIG. 5 is a flowchart showing an operation in which the control unit 17 of the air conditioner 30 according to the present embodiment determines the required capacity line according to the operation mode of the air conditioner 30 and the outside air temperature. In the flowchart shown in FIG. 5, the low outside air cooling threshold value, the high outside air cooling threshold value, the low outside air heating threshold value, and the high outside air heating threshold value are obtained from the test results conducted in advance by the user or the manufacturer of the air conditioner 30. It is assumed that each threshold value is determined and set in the control unit 17.
　制御部１７は、空気調和装置３０の運転モードが冷房または暖房かを判定する（ステップＳ１０１）。冷房の場合（ステップＳ１０１：Ｙｅｓ）、制御部１７は、外気温度と低外気冷房閾値とを比較する（ステップＳ１０２）。外気温度≦低外気冷房閾値の場合（ステップＳ１０２：Ｙｅｓ）、制御部１７は、必要能力ラインとして冷房低外気能力ラインＫ５を設定する（ステップＳ１０３）。低外気冷房閾値＜外気温度の場合（ステップＳ１０２：Ｎｏ）、制御部１７は、外気温度と高外気冷房閾値とを比較する（ステップＳ１０４）。低外気冷房閾値＜外気温度≦高外気冷房閾値の場合（ステップＳ１０４：Ｙｅｓ）、制御部１７は、必要能力ラインとして冷房定格能力ラインＫ１を設定する（ステップＳ１０５）。高外気冷房閾値＜外気温度の場合（ステップＳ１０４：Ｎｏ）、制御部１７は、必要能力ラインとして冷房高外気能力ラインＫ３を設定する（ステップＳ１０６）。 The control unit 17 determines whether the operation mode of the air conditioner 30 is cooling or heating (step S101). In the case of cooling (step S101: Yes), the control unit 17 compares the outside air temperature with the low outside air cooling threshold value (step S102). When the outside air temperature ≤ the low outside air cooling threshold value (step S102: Yes), the control unit 17 sets the cooling low outside air capacity line K5 as the required capacity line (step S103). When the low outside air cooling threshold value <outside air temperature (step S102: No), the control unit 17 compares the outside air temperature with the high outside air cooling threshold value (step S104). When the low outside air cooling threshold value <outside air temperature ≤ high outside air cooling threshold value (step S104: Yes), the control unit 17 sets the cooling rated capacity line K1 as the required capacity line (step S105). When the high outside air cooling threshold value <outside air temperature (step S104: No), the control unit 17 sets the cooling high outside air capacity line K3 as the required capacity line (step S106).
　暖房の場合（ステップＳ１０１：Ｎｏ）、制御部１７は、外気温度と低外気暖房閾値とを比較する（ステップＳ１０７）。外気温度≦低外気暖房閾値の場合（ステップＳ１０７：Ｙｅｓ）、制御部１７は、必要能力ラインとして暖房低外気能力ラインＫ４を設定する（ステップＳ１０８）。低外気暖房閾値＜外気温度の場合（ステップＳ１０７：Ｎｏ）、制御部１７は、外気温度と高外気暖房閾値とを比較する（ステップＳ１０９）。低外気暖房閾値＜外気温度≦高外気暖房閾値の場合（ステップＳ１０９：Ｙｅｓ）、制御部１７は、必要能力ラインとして暖房定格能力ラインＫ２を設定する（ステップＳ１１０）。高外気暖房閾値＜外気温度の場合（ステップＳ１０９：Ｎｏ）、制御部１７は、必要能力ラインとして暖房高外気能力ラインＫ６を設定する（ステップＳ１１１）。 In the case of heating (step S101: No), the control unit 17 compares the outside air temperature with the low outside air heating threshold value (step S107). When the outside air temperature ≤ the low outside air heating threshold value (step S107: Yes), the control unit 17 sets the heating low outside air capacity line K4 as the required capacity line (step S108). When the low outside air heating threshold value <outside air temperature (step S107: No), the control unit 17 compares the outside air temperature with the high outside air heating threshold value (step S109). When the low outside air heating threshold value <outside air temperature ≤ high outside air heating threshold value (step S109: Yes), the control unit 17 sets the heating rated capacity line K2 as the required capacity line (step S110). When the high outside air heating threshold value <outside air temperature (step S109: No), the control unit 17 sets the heating high outside air capacity line K6 as the required capacity line (step S111).
　図６は、本実施の形態に係る空気調和装置３０の制御部１７による圧縮機１の運転周波数および室外ファン３の回転数の遷移を示す図である。ここでは、一例として、空気調和装置３０の運転モードが冷房、かつ外気温度は定格条件で運転したときのグラフを示しているため、図６に示すＬ１の必要能力ラインは冷房定格能力ラインＫ１となる。 FIG. 6 is a diagram showing transitions between the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 by the control unit 17 of the air conditioner 30 according to the present embodiment. Here, as an example, since the graph is shown when the operation mode of the air conditioner 30 is cooling and the outside air temperature is operated under the rated conditions, the required capacity line of L1 shown in FIG. 6 is the cooling rated capacity line K1. Become.
　また、図６は、圧縮機１の運転周波数および室外ファン３の回転数と、騒音値の大きさとの関係を示している。領域Ｆ１は、圧縮機１の運転周波数および室外ファン３の回転数がともに高いため、騒音値が大きい領域となる。領域Ｆ２は、圧縮機１の運転周波数は小さいが、室外ファン３の回転数が高いため、騒音値が中程度の領域となる。領域Ｆ３は、圧縮機１の運転周波数は大きいが、防音材１９，２０などにより騒音が低減されており、室外ファン３の回転数が少し低い状態にあるため、騒音値が中程度の領域となる。領域Ｆ４は、圧縮機１の運転周波数が低く、室外ファン３の回転数も少し低い状態にあるため、騒音値が小さい領域となる。領域Ｆ５は、室外ファン３の回転数は低いが、圧縮機１の運転周波数が大きいため、騒音値が中程度の領域となる。領域Ｆ６は、圧縮機１の運転周波数および室外ファン３の回転数がともに低いため、騒音値は小さい領域となる。 Further, FIG. 6 shows the relationship between the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 and the magnitude of the noise value. Since the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 are both high in the region F1, the region F1 is a region in which the noise value is large. In the region F2, the operating frequency of the compressor 1 is low, but the rotation speed of the outdoor fan 3 is high, so that the noise level is in a medium region. In the region F3, the operating frequency of the compressor 1 is high, but the noise is reduced by the soundproofing materials 19, 20, etc., and the rotation speed of the outdoor fan 3 is a little low. Become. The region F4 is a region where the noise value is small because the operating frequency of the compressor 1 is low and the rotation speed of the outdoor fan 3 is also slightly low. In the region F5, the rotation speed of the outdoor fan 3 is low, but the operating frequency of the compressor 1 is high, so that the noise level is in a medium region. Since the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 are both low in the region F6, the noise level is in a small region.
　図６において、Ｌ２は、空気調和装置３０が定常運転に入ったタイミングのポイント、すなわち圧縮機１の運転周波数、および室外ファン３の回転数を示す。なお、本実施の形態では、制御部１７は、空気調和装置３０の起動後の一定時間は騒音低減のための制御は行わず、定常運転に入ったタイミングで騒音低減のための制御を開始する。空気調和装置３０では、圧縮機１の起動初期は安全運転範囲から外れないよう決められた制御を行うためである。制御部１７は、空気調和装置３０が定常運転に入ったＬ２を開始ポイントとしたとき、Ｌ３に示すように室外ファン３の回転数を変化させる、すなわち減少させる制御を行う。 In FIG. 6, L2 indicates the timing point at which the air conditioner 30 enters steady operation, that is, the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3. In the present embodiment, the control unit 17 does not perform control for noise reduction for a certain period of time after the start of the air conditioner 30, but starts control for noise reduction at the timing of entering steady operation. .. This is because the air conditioner 30 performs a predetermined control so as not to deviate from the safe operation range at the initial stage of starting the compressor 1. The control unit 17 controls to change, that is, decrease the rotation speed of the outdoor fan 3 as shown in L3 when the air conditioner 30 enters the steady operation with L2 as the start point.
　制御部１７は、Ｌ３に示す室外ファン３の回転数の変化について、放熱板温度センサ９で検知された放熱板温度、および凝縮温度を用いて判定する。ここで、凝縮温度は、空気調和装置３０の運転モードが冷房の場合、室外二相管温度センサ１０および室外液管温度センサ１１で検知された温度のうち高い方の温度とする。また、凝縮温度は、空気調和装置３０の運転モードが暖房の場合、室内二相管温度センサ１２および室内液管温度センサ１３で検知された温度のうち高い方の温度とする。すなわち、凝縮温度は、空気調和装置３０の運転モードによって規定された、室内機３２または室外機３１に設置された温度センサで検知された温度である。 The control unit 17 determines the change in the rotation speed of the outdoor fan 3 shown in L3 by using the heat radiating plate temperature detected by the heat radiating plate temperature sensor 9 and the condensation temperature. Here, the condensation temperature is set to the higher temperature of the temperatures detected by the outdoor two-phase pipe temperature sensor 10 and the outdoor liquid pipe temperature sensor 11 when the operation mode of the air conditioner 30 is cooling. Further, the condensation temperature is set to the higher temperature of the temperatures detected by the indoor two-phase pipe temperature sensor 12 and the indoor liquid pipe temperature sensor 13 when the operation mode of the air conditioner 30 is heating. That is, the condensation temperature is the temperature detected by the temperature sensor installed in the indoor unit 32 or the outdoor unit 31 defined by the operation mode of the air conditioner 30.
　まず、制御部１７は、放熱板温度センサ９で検知された放熱板温度を用いて、室外ファン３の回転数のダウン、維持、またはアップを判定する。図７は、本実施の形態に係る空気調和装置３０の制御部１７による放熱板温度を用いた室外ファン３の回転数の制御を示すフローチャートである。なお、図７に示すフローチャートにおいて、第１のファン回転数ダウン閾値、および第１のファン回転数アップ閾値は、ユーザまたは空気調和装置３０の製造者などが、予め実施した試験結果から閾値を決定し、制御部１７に設定されているものとする。制御部１７は、放熱板温度と第１のファン回転数ダウン閾値とを比較する（ステップＳ２０１）。放熱板温度＜第１のファン回転数ダウン閾値の場合（ステップＳ２０１：Ｙｅｓ）、制御部１７は、第１のファン回転数ダウン状態と判定する（ステップＳ２０２）。第１のファン回転数ダウン閾値≦放熱板温度の場合（ステップＳ２０１：Ｎｏ）、制御部１７は、放熱板温度と第１のファン回転数アップ閾値とを比較する（ステップＳ２０３）。第１のファン回転数ダウン閾値≦放熱板温度＜第１のファン回転数アップ閾値の場合（ステップＳ２０３：Ｙｅｓ）、制御部１７は、第１のファン回転数維持状態と判定する（ステップＳ２０４）。第１のファン回転数アップ閾値≦放熱板温度の場合（ステップＳ２０３：Ｎｏ）、制御部１７は、第１のファン回転数アップ状態と判定する（ステップＳ２０５）。なお、制御部１７は、この時点では、室外ファン３の回転数は変化させない。 First, the control unit 17 determines whether the rotation speed of the outdoor fan 3 is down, maintained, or up by using the heat radiating plate temperature detected by the heat radiating plate temperature sensor 9. FIG. 7 is a flowchart showing the control of the rotation speed of the outdoor fan 3 by using the heat radiating plate temperature by the control unit 17 of the air conditioner 30 according to the present embodiment. In the flowchart shown in FIG. 7, the first fan rotation speed down threshold value and the first fan rotation speed up threshold value are determined from the test results conducted in advance by the user, the manufacturer of the air conditioner 30, or the like. It is assumed that the control unit 17 is set. The control unit 17 compares the heat dissipation plate temperature with the first fan speed down threshold (step S201). When the heat radiation plate temperature <first fan speed down threshold value (step S201: Yes), the control unit 17 determines that the first fan speed down state (step S202). When the first fan rotation speed down threshold value ≤ heat dissipation plate temperature (step S201: No), the control unit 17 compares the heat dissipation plate temperature with the first fan rotation speed up threshold value (step S203). When the first fan rotation speed down threshold value ≤ heat dissipation plate temperature <first fan rotation speed up threshold value (step S203: Yes), the control unit 17 determines that the first fan rotation speed maintenance state is maintained (step S204). .. When the first fan rotation speed increase threshold value ≤ the heat radiation plate temperature (step S203: No), the control unit 17 determines that the first fan rotation speed increase state (step S205). At this point, the control unit 17 does not change the rotation speed of the outdoor fan 3.
　つぎに、制御部１７は、凝縮温度を用いて、室外ファン３の回転数のダウン、維持、またはアップを判定する。図８は、本実施の形態に係る空気調和装置３０の制御部１７による凝縮温度を用いた室外ファン３の回転数の制御を示すフローチャートである。なお、図８に示すフローチャートにおいて、第２のファン回転数ダウン閾値、および第２のファン回転数アップ閾値は、ユーザまたは空気調和装置３０の製造者などが、予め実施した試験結果から閾値を決定し、制御部１７に設定されているものとする。制御部１７は、凝縮温度と第２のファン回転数ダウン閾値とを比較する（ステップＳ３０１）。凝縮温度＜第２のファン回転数ダウン閾値の場合（ステップＳ３０１：Ｙｅｓ）、制御部１７は、第２のファン回転数ダウン状態と判定する（ステップＳ３０２）。第２のファン回転数ダウン閾値≦凝縮温度の場合（ステップＳ３０１：Ｎｏ）、制御部１７は、凝縮温度と第２のファン回転数アップ閾値とを比較する（ステップＳ３０３）。第２のファン回転数ダウン閾値≦凝縮温度＜第２のファン回転数アップ閾値の場合（ステップＳ３０３：Ｙｅｓ）、制御部１７は、第２のファン回転数維持状態と判定する（ステップＳ３０４）。第２のファン回転数アップ閾値≦凝縮温度の場合（ステップＳ３０３：Ｎｏ）、制御部１７は、第２のファン回転数アップ状態と判定する（ステップＳ３０５）。 Next, the control unit 17 determines whether the rotation speed of the outdoor fan 3 is down, maintained, or up by using the condensation temperature. FIG. 8 is a flowchart showing the control of the rotation speed of the outdoor fan 3 using the condensation temperature by the control unit 17 of the air conditioner 30 according to the present embodiment. In the flowchart shown in FIG. 8, the second fan rotation speed down threshold value and the second fan rotation speed up threshold value are determined from the test results conducted in advance by the user, the manufacturer of the air conditioner 30, or the like. It is assumed that the control unit 17 is set. The control unit 17 compares the condensation temperature with the second fan speed down threshold (step S301). When the condensation temperature <the second fan speed down threshold value (step S301: Yes), the control unit 17 determines that the second fan speed down state (step S302). When the second fan rotation speed down threshold value ≤ condensation temperature (step S301: No), the control unit 17 compares the condensation temperature with the second fan rotation speed up threshold value (step S303). When the second fan rotation speed down threshold value ≤ condensation temperature <second fan rotation speed up threshold value (step S303: Yes), the control unit 17 determines that the second fan rotation speed maintenance state is maintained (step S304). When the second fan rotation speed increase threshold value ≤ condensation temperature (step S303: No), the control unit 17 determines that the second fan rotation speed increase state (step S305).
　制御部１７は、放熱板温度を用いて得られた、第１のファン回転数ダウン状態、または第１のファン回転数維持状態、または第１のファン回転数アップ状態の判定結果を図９に当てはめ、凝縮温度を用いて得られた、第２のファン回転数ダウン状態、または第２のファン回転数維持状態、または第２のファン回転数アップ状態の判定結果を図９に当てはめる。図９は、本実施の形態に係る空気調和装置３０の制御部１７による放熱板温度および凝縮温度に基づく室外ファン３の回転数の制御を示す図である。制御部１７は、各判定結果を図９に当てはめた結果から、ファン回転数ダウン、またはファン回転数維持、ファン回転数アップを決定する。図９の例では、第１のファン回転数ダウン状態かつ第２のファン回転数ダウン状態の場合、ファン回転数ダウンとする。また、第１のファン回転数アップ状態または第２のファン回転数アップ状態の場合、および第１のファン回転数アップ状態かつ第２のファン回転数アップ状態の場合、ファン回転数アップとする。その他の場合、ファン回転数維持とする。制御部１７は、ファン回転数ダウンの場合、室外ファン３の回転数の上限値を規定数減少させる。制御部１７は、ファン回転数維持の場合、室外ファン３の回転数の現在の上限値を維持する。制御部１７は、ファン回転数アップの場合、室外ファン３の回転数の上限値を規定数増加させる。 FIG. 9 shows the determination result of the first fan rotation speed down state, the first fan rotation speed maintenance state, or the first fan rotation speed up state obtained by the control unit 17 using the heat radiation plate temperature. The determination result of the second fan rotation speed down state, the second fan rotation speed maintenance state, or the second fan rotation speed up state obtained by fitting and condensing temperature is applied to FIG. FIG. 9 is a diagram showing control of the rotation speed of the outdoor fan 3 based on the heat radiating plate temperature and the condensation temperature by the control unit 17 of the air conditioner 30 according to the present embodiment. From the result of applying each determination result to FIG. 9, the control unit 17 determines to reduce the fan rotation speed, maintain the fan rotation speed, or increase the fan rotation speed. In the example of FIG. 9, when the first fan speed is down and the second fan speed is down, the fan speed is down. Further, in the case of the first fan rotation speed up state or the second fan rotation speed up state, and in the case of the first fan rotation speed up state and the second fan rotation speed up state, the fan rotation speed is increased. In other cases, the fan speed is maintained. When the fan rotation speed is reduced, the control unit 17 reduces the upper limit value of the rotation speed of the outdoor fan 3 by a specified number. In the case of maintaining the fan rotation speed, the control unit 17 maintains the current upper limit value of the rotation speed of the outdoor fan 3. When the fan rotation speed is increased, the control unit 17 increases the upper limit value of the rotation speed of the outdoor fan 3 by a specified number.
　制御部１７は、図７から図９に示す動作によって、図６のＬ３に示す室外ファン３の回転数の変化を実現する。制御部１７は、図７から図９に示す動作を規定された時間間隔で繰り返し実施する。制御部１７は、図６のＬ３の動作によって室外ファン３の回転数の上限値を減少させていくと、図６に示すＬ４のように凝縮温度過昇防止制限が働き、圧縮機１の運転周波数を減少させる。制御部１７がＬ３およびＬ４の動作を繰り返し実施することによって、空気調和装置３０では、Ｌ１の必要能力ラインに達したポイントＬ５において、圧縮機１の運転周波数および室外ファン３の回転数が安定する。 The control unit 17 realizes a change in the rotation speed of the outdoor fan 3 shown in L3 of FIG. 6 by the operations shown in FIGS. 7 to 9. The control unit 17 repeatedly performs the operations shown in FIGS. 7 to 9 at predetermined time intervals. When the control unit 17 reduces the upper limit of the rotation speed of the outdoor fan 3 by the operation of L3 in FIG. 6, the limit for preventing overheating of the condensation temperature works as in L4 shown in FIG. 6, and the compressor 1 is operated. Decrease the frequency. By repeatedly performing the operations of L3 and L4 by the control unit 17, in the air conditioner 30, the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 are stabilized at the point L5 when the required capacity line of L1 is reached. ..
　このように、本実施の形態において、制御部１７は、図６に示すように圧縮機１の運転周波数および室外ファン３の回転数を制御することによって、特許文献１の制御と比較して、騒音値が大きい領域Ｆ１に滞在する時間を短くすることができる。図１０は、本実施の形態に係る空気調和装置３０での室外ファン３による騒音値の変化を示す図である。図１０において、横軸は時間を示し、縦軸は騒音値を示す。図１０において、Ｐ１の破線は比較例として特許文献１の制御による騒音値の遷移を示し、Ｐ２は本実施の形態の制御部１７の制御による空気調和装置３０の騒音値の遷移を示している。図１０において、Ｐ３の領域が騒音値の差分を示している。Ｐ２、すなわち本実施の形態では、室外ファン３の回転数を迅速に減少させて、騒音値が高い時間を短く抑えられていることが分かる。 As described above, in the present embodiment, the control unit 17 controls the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 as shown in FIG. 6, as compared with the control of Patent Document 1. The time spent in the region F1 where the noise value is large can be shortened. FIG. 10 is a diagram showing a change in noise value due to the outdoor fan 3 in the air conditioner 30 according to the present embodiment. In FIG. 10, the horizontal axis represents time and the vertical axis represents noise value. In FIG. 10, the broken line of P1 shows the transition of the noise value under the control of Patent Document 1 as a comparative example, and P2 shows the transition of the noise value of the air conditioner 30 under the control of the control unit 17 of the present embodiment. .. In FIG. 10, the region of P3 shows the difference in noise value. It can be seen that in P2, that is, in the present embodiment, the rotation speed of the outdoor fan 3 is rapidly reduced to shorten the time when the noise value is high.
　制御部１７は、図６示すようにＬ５まで遷移させた後は、図１１に示すように同じ領域内での遷移を繰り返し実施する。図１１は、本実施の形態に係る空気調和装置３０の制御部１７が室外ファン３の騒音を低減させた後に行う制御を示す図である。まず、制御部１７は、Ｌ５のポイントにおいて、空調能力が必要と判定した場合、Ｑ１に示すように圧縮機１の運転周波数を増加させる。その後、制御部１７は、前述のように室外ファン３の回転数の変化を判定し、Ｑ２に示すように室外ファン３の回転数を遷移させる。つぎに、制御部１７は、凝縮温度過昇防止制限によってＱ３に示すように圧縮機１の運転周波数を減少させる。制御部１７は、圧縮機１の運転周波数の減少に伴い、室外ファン３の回転数変化を判定し、Ｑ４に示すように室外ファン３の回転数を変化させる。制御部１７は、図１１に示すように、必要能力ライン付近で圧縮機１の運転周波数および室外ファン３の回転数を遷移させることによって、必要最低限の室外ファン３の回転数にて空気調和装置３０の運転を継続させることができる。このように、制御部１７は、室外放熱板温度と凝縮温度とに基づいて、室外ファン３の上限回転数を変化させ、室外ファン３の回転数を制御する。制御部１７は、室外ファン３の上限回転数を減少させた場合、圧縮機１の運転周波数を減少させる。 After the transition to L5 as shown in FIG. 6, the control unit 17 repeatedly executes the transition within the same region as shown in FIG. FIG. 11 is a diagram showing control performed after the control unit 17 of the air conditioner 30 according to the present embodiment reduces the noise of the outdoor fan 3. First, when the control unit 17 determines that the air conditioning capacity is necessary at the point L5, the control unit 17 increases the operating frequency of the compressor 1 as shown in Q1. After that, the control unit 17 determines the change in the rotation speed of the outdoor fan 3 as described above, and changes the rotation speed of the outdoor fan 3 as shown in Q2. Next, the control unit 17 reduces the operating frequency of the compressor 1 as shown in Q3 by limiting the prevention of overheating of the condensation temperature. The control unit 17 determines the change in the rotation speed of the outdoor fan 3 as the operating frequency of the compressor 1 decreases, and changes the rotation speed of the outdoor fan 3 as shown in Q4. As shown in FIG. 11, the control unit 17 changes the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 in the vicinity of the required capacity line to harmonize the air with the minimum necessary rotation speed of the outdoor fan 3. The operation of the device 30 can be continued. In this way, the control unit 17 changes the upper limit rotation speed of the outdoor fan 3 based on the outdoor heat radiation plate temperature and the condensation temperature, and controls the rotation speed of the outdoor fan 3. The control unit 17 reduces the operating frequency of the compressor 1 when the upper limit rotation speed of the outdoor fan 3 is reduced.
　つぎに、制御部１７が、必要能力ラインを設定または解除する方法について説明する。制御部１７は、必要能力ラインについて、空調能力の必要有無によって設定または解除する。図１２は、本実施の形態に係る空気調和装置３０の制御部１７による必要能力ラインの必要有無の判定を示すフローチャートである。まず、制御部１７は、室内設定温度記憶部１４に記憶されている室内設定温度と、室内吸い込み温度センサ１５で検知された室内吸い込み温度との差分の絶対値ΔＴｊを算出する（ステップＳ４０１）。制御部１７は、算出した差分の絶対値ΔＴｊを記憶する。制御部１７は、１分前の差分の絶対値ΔＴｊと現在の差分の絶対値ΔＴｊとの差分ΔＦｊを算出する（ステップＳ４０２）。制御部１７は、ΔＦｊ＞０の場合（ステップＳ４０３：Ｙｅｓ）、空調能力必要有りと判定し、必要能力ラインを設定する（ステップＳ４０４）。必要能力ラインを設定する方法は、前述の通りである。制御部１７は、ΔＦｊ≦０の場合（ステップＳ４０３：Ｎｏ）、空調能力必要無しと判定し、必要能力ラインを設定しない（ステップＳ４０５）。 Next, the control unit 17 will explain how to set or cancel the required capacity line. The control unit 17 sets or cancels the required capacity line depending on whether or not the air conditioning capacity is required. FIG. 12 is a flowchart showing a determination of whether or not a required capacity line is necessary by the control unit 17 of the air conditioner 30 according to the present embodiment. First, the control unit 17 calculates the absolute value ΔTj of the difference between the indoor set temperature stored in the indoor set temperature storage unit 14 and the indoor suction temperature detected by the indoor suction temperature sensor 15 (step S401). The control unit 17 stores the calculated absolute value ΔTj of the difference. The control unit 17 calculates the difference ΔFj between the absolute value ΔTj of the difference one minute ago and the absolute value ΔTj of the current difference (step S402). When ΔFj> 0 (step S403: Yes), the control unit 17 determines that the air conditioning capacity is necessary and sets the required capacity line (step S404). The method of setting the required capacity line is as described above. When ΔFj ≦ 0 (step S403: No), the control unit 17 determines that the air conditioning capacity is not required and does not set the required capacity line (step S405).
　このように、制御部１７は、室内設定温度と室内機３２の室内吸い込み温度との差分から、必要能力ラインの設定の有無を判定する。制御部１７は、必要能力ラインの設定が必要と判定した場合、空気調和装置３０の運転モードおよび外気温度に基づいて必要能力ラインを設定する。制御部１７は、必要能力ラインで規定された運転周波数以上になるように圧縮機１を制御し、必要能力ラインで規定された回転数以上になるように室外ファン３を制御する。 In this way, the control unit 17 determines whether or not the required capacity line is set from the difference between the indoor set temperature and the indoor suction temperature of the indoor unit 32. When the control unit 17 determines that it is necessary to set the required capacity line, the control unit 17 sets the required capacity line based on the operation mode of the air conditioner 30 and the outside air temperature. The control unit 17 controls the compressor 1 so that the operating frequency is equal to or higher than the operating frequency specified by the required capacity line, and controls the outdoor fan 3 so that the rotation speed is equal to or higher than the rotation speed specified by the required capacity line.
　空調能力が必要無い場合の制御部１７による圧縮機１の運転周波数および室外ファン３の回転数の遷移について説明する。図１３は、本実施の形態に係る空気調和装置３０の制御部１７において空調能力が必要無いと判定したときの圧縮機１の運転周波数および室外ファン３の回転数の遷移を示す図である。制御部１７は、図１３に示すように、Ｌ１の必要能力ラインによる下限値を設けないため、Ｒ２に示すようにＬ５を初期ポイントとして室外ファン３の回転数を減少させ、さらに、Ｒ３に示すように圧縮機１の運転周波数を減少させることができる。 The transition of the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 by the control unit 17 when the air conditioning capacity is not required will be described. FIG. 13 is a diagram showing transitions between the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 when the control unit 17 of the air conditioner 30 according to the present embodiment determines that the air conditioning capacity is not required. As shown in FIG. 13, the control unit 17 does not set the lower limit value according to the required capacity line of L1, so that the rotation speed of the outdoor fan 3 is reduced with L5 as the initial point as shown in R2, and further shown in R3. As described above, the operating frequency of the compressor 1 can be reduced.
　図１４は、本実施の形態に係る空気調和装置３０の制御部１７において空調能力が必要無いと判定した後に空調能力が必要と判定したときの圧縮機１の運転周波数の遷移を示す図である。制御部１７は、Ｒ４を初期ポイントとしたとき、Ｌ１の必要能力ラインが設定されると、必要能力ラインＬ１で圧縮機１の運転周波数の下限値を設定し、Ｒ５に示すように、必要能力ラインＬ１で示される下限値を超えるように、圧縮機１の運転周波数を遷移、すなわち増加させる。その後、制御部１７は、図１１に示すような圧縮機１の運転周波数および室外ファン３の回転数の遷移を実施する。 FIG. 14 is a diagram showing a transition of the operating frequency of the compressor 1 when the control unit 17 of the air conditioner 30 according to the present embodiment determines that the air conditioning capacity is not required and then determines that the air conditioning capacity is required. .. When the required capacity line of L1 is set when R4 is set as the initial point, the control unit 17 sets the lower limit of the operating frequency of the compressor 1 on the required capacity line L1 and sets the required capacity as shown in R5. The operating frequency of the compressor 1 is changed, that is, increased so as to exceed the lower limit value indicated by the line L1. After that, the control unit 17 changes the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 as shown in FIG.
　このように、制御部１７は、必要能力ラインの設定および解除を行うことで、空調能力が必要無い場合に過剰な空調能力による運転をすることがなく、必要最低限の空調能力での空気調和装置３０の運転が可能となる。 In this way, by setting and canceling the required capacity line, the control unit 17 does not operate due to excessive air conditioning capacity when the air conditioning capacity is not required, and air conditioning with the minimum required air conditioning capacity. The device 30 can be operated.
　つづいて、空気調和装置３０が備える制御部１７のハードウェア構成について説明する。図１５は、本実施の形態に係る空気調和装置３０が備える制御部１７を実現するハードウェア構成の一例を示す図である。制御部１７は、プロセッサ２０１およびメモリ２０２により実現される。 Next, the hardware configuration of the control unit 17 included in the air conditioner 30 will be described. FIG. 15 is a diagram showing an example of a hardware configuration that realizes the control unit 17 included in the air conditioner 30 according to the present embodiment. The control unit 17 is realized by the processor 201 and the memory 202.
　プロセッサ２０１は、ＣＰＵ（Central　Processing　Unit、中央処理装置、処理装置、演算装置、マイクロプロセッサ、マイクロコンピュータ、プロセッサ、ＤＳＰ（Digital　Signal　Processor）ともいう）、またはシステムＬＳＩ（Large　Scale　Integration）である。メモリ２０２は、ＲＡＭ（Random　Access　Memory）、ＲＯＭ（Read　Only　Memory）、フラッシュメモリー、ＥＰＲＯＭ（Erasable　Programmable　Read　Only　Memory）、ＥＥＰＲＯＭ（登録商標）（Electrically　Erasable　Programmable　Read-Only　Memory）といった不揮発性または揮発性の半導体メモリを例示できる。またメモリ２０２は、これらに限定されず、磁気ディスク、光ディスク、コンパクトディスク、ミニディスク、またはＤＶＤ（Digital　Versatile　Disc）でもよい。 The processor 201 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP (Digital Signal Processor)), or system LSI (Large Scale Integration). The memory 202 is non-volatile or volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EEPROM (Erasable Programmable Read Only Memory), EEPROM (registered trademark) (Electrically Erasable Programmable Read-Only Memory). The semiconductor memory of the above can be illustrated. The memory 202 is not limited to these, and may be a magnetic disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versatile Disc).
　以上説明したように、本実施の形態によれば、空気調和装置３０において制御部１７は、室外ファン３の回転数を優先的に減少させ、図６に示す領域Ｆ１のように騒音値が大きい領域に滞在しないよう制御することで、室外ファン３の騒音を低減することができる。このとき、制御部１７は、必要に応じで必要能力ラインを設定する。制御部１７は、圧縮機１の運転周波数および室外ファン３の回転数が必要能力ラインを下回らないよう空気調和装置３０を運転することで、低騒音を優先したことによって空調能力が不足する事態を回避することができる。 As described above, according to the present embodiment, in the air conditioner 30, the control unit 17 preferentially reduces the rotation speed of the outdoor fan 3, and the noise level is large as in the region F1 shown in FIG. By controlling so as not to stay in the area, the noise of the outdoor fan 3 can be reduced. At this time, the control unit 17 sets the required capacity line as needed. The control unit 17 operates the air conditioner 30 so that the operating frequency of the compressor 1 and the rotation speed of the outdoor fan 3 do not fall below the required capacity line, so that the air conditioning capacity is insufficient due to the priority given to low noise. It can be avoided.
　以上の実施の形態に示した構成は、一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、実施の形態同士を組み合わせることも可能であるし、要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。 The configuration shown in the above embodiments is an example, and can be combined with another known technique, can be combined with each other, and does not deviate from the gist. It is also possible to omit or change a part of the configuration.
　１　圧縮機、２　四方弁、３　室外ファン、４　室外熱交換器、５　膨張弁、６　室内熱交換器、７　配管、８　放熱板、９　放熱板温度センサ、１０　室外二相管温度センサ、１１　室外液管温度センサ、１２　室内二相管温度センサ、１３　室内液管温度センサ、１４　室内設定温度記憶部、１５　室内吸い込み温度センサ、１６　外気温度センサ、１７　制御部、１８　冷媒回路、１９，２０　防音材、３０　空気調和装置、３１　室外機、３２　室内機。 1 Compressor, 2 4-way valve, 3 outdoor fan, 4 outdoor heat exchanger, 5 expansion valve, 6 indoor heat exchanger, 7 piping, 8 heat dissipation plate, 9 heat dissipation plate temperature sensor, 10 outdoor two-phase pipe temperature sensor, 11 Outdoor liquid pipe temperature sensor, 12 indoor two-phase pipe temperature sensor, 13 indoor liquid pipe temperature sensor, 14 indoor set temperature storage unit, 15 indoor suction temperature sensor, 16 outdoor air temperature sensor, 17 control unit, 18 refrigerant circuit, 19, 20 Soundproofing material, 30 air conditioner, 31 outdoor unit, 32 indoor unit.

Claims (5)

  1. 　運転周波数を調整し、冷媒回路に流れる冷媒を圧縮する圧縮機と、
    　回転数を調整し、前記冷媒の熱交換を行う室外熱交換器を冷却する室外ファンと、
    　前記圧縮機の前記運転周波数および前記室外ファンの前記回転数を制御し、必要な空調能力を確保しつつ、前記室外ファンの前記回転数を優先的に下げて低騒音運転を実施する制御部と、
    　を備える空気調和装置。     A compressor that adjusts the operating frequency and compresses the refrigerant flowing in the refrigerant circuit,
    An outdoor fan that cools the outdoor heat exchanger that adjusts the rotation speed and exchanges heat with the refrigerant.
    A control unit that controls the operating frequency of the compressor and the rotation speed of the outdoor fan to preferentially reduce the rotation speed of the outdoor fan to perform low noise operation while ensuring the necessary air conditioning capacity. ,
    An air conditioner equipped with.
  2. 　前記制御部は、室内設定温度と室内機の室内吸い込み温度との差分から、必要な空調能力を確保するために前記運転周波数および前記回転数が規定された必要能力ラインの設定の有無を判定し、必要と判定した場合、前記空気調和装置の運転モードおよび外気温度に基づいて必要能力ラインを設定し、前記必要能力ラインで規定された運転周波数以上になるように前記圧縮機を制御し、前記必要能力ラインで規定された回転数以上になるように前記室外ファンを制御する、
    　請求項１に記載の空気調和装置。     From the difference between the indoor set temperature and the indoor suction temperature of the indoor unit, the control unit determines whether or not the required capacity line in which the operating frequency and the rotation speed are specified is set in order to secure the required air conditioning capacity. When it is determined that it is necessary, the required capacity line is set based on the operation mode of the air conditioner and the outside air temperature, and the compressor is controlled so as to be equal to or higher than the operating frequency specified by the required capacity line. The outdoor fan is controlled so that the rotation speed exceeds the rotation speed specified by the required capacity line.
    The air conditioner according to claim 1.
  3. 　前記制御部は、実測値に基づいて決定される外気温度の条件毎の係数、前記外気温度に基づく前記圧縮機の運転周波数、および前記室外ファンの最大ファン回転数を用いて、前記室外ファンの各回転数に対する前記圧縮機の運転周波数を算出し、前記必要能力ラインを設定する、
    　請求項２に記載の空気調和装置。     The control unit uses the coefficient for each condition of the outside air temperature determined based on the measured value, the operating frequency of the compressor based on the outside air temperature, and the maximum fan speed of the outdoor fan to obtain the outdoor fan. Calculate the operating frequency of the compressor for each rotation speed and set the required capacity line.
    The air conditioner according to claim 2.
  4. 　前記制御部は、室外機の動作を制御する制御基板の熱を放出する放熱板の温度である室外放熱板温度と、前記空気調和装置の運転モードによって規定された室内機または前記室外機に設置された温度センサで検知された凝縮温度とに基づいて、前記室外ファンの上限回転数を変化させ、前記室外ファンの回転数を制御する、
    　請求項１から３のいずれか１つに記載の空気調和装置。     The control unit is installed in the indoor unit or the outdoor unit defined by the outdoor heat radiating plate temperature, which is the temperature of the heat radiating plate that releases heat of the control board that controls the operation of the outdoor unit, and the operation mode of the air conditioner. Based on the condensation temperature detected by the temperature sensor, the upper limit rotation speed of the outdoor fan is changed to control the rotation speed of the outdoor fan.
    The air conditioner according to any one of claims 1 to 3.
  5. 　前記制御部は、前記室外ファンの上限回転数を減少させた場合、前記圧縮機の前記運転周波数を減少させる、
    　請求項４に記載の空気調和装置。     When the upper limit rotation speed of the outdoor fan is reduced, the control unit reduces the operating frequency of the compressor.
    The air conditioner according to claim 4.
PCT/JP2020/004371 2020-02-05 2020-02-05 Air conditioning apparatus WO2021156975A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336448A (en) * 1989-06-30 1991-02-18 Toshiba Corp air conditioner
JPH09303892A (en) * 1996-05-15 1997-11-28 Sharp Corp Outdoor machine of air conditioner
JPH10185284A (en) * 1996-10-28 1998-07-14 Daikin Ind Ltd Air conditioner
JP2011237093A (en) * 2010-05-10 2011-11-24 Fujitsu General Ltd Air conditioner
WO2017163296A1 (en) * 2016-03-22 2017-09-28 三菱電機株式会社 Refrigeration device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336448A (en) * 1989-06-30 1991-02-18 Toshiba Corp air conditioner
JPH09303892A (en) * 1996-05-15 1997-11-28 Sharp Corp Outdoor machine of air conditioner
JPH10185284A (en) * 1996-10-28 1998-07-14 Daikin Ind Ltd Air conditioner
JP2011237093A (en) * 2010-05-10 2011-11-24 Fujitsu General Ltd Air conditioner
WO2017163296A1 (en) * 2016-03-22 2017-09-28 三菱電機株式会社 Refrigeration device

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