WO2017073688A1 - 空気調和機 - Google Patents
空気調和機 Download PDFInfo
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- WO2017073688A1 WO2017073688A1 PCT/JP2016/081933 JP2016081933W WO2017073688A1 WO 2017073688 A1 WO2017073688 A1 WO 2017073688A1 JP 2016081933 W JP2016081933 W JP 2016081933W WO 2017073688 A1 WO2017073688 A1 WO 2017073688A1
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- Prior art keywords
- speed
- rotational speed
- air
- mode
- control unit
- Prior art date
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Classifications
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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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
- 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
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/07—Exceeding a certain pressure value in a refrigeration component or cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/027—Compressor control by controlling pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
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- 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 invention relates to an air conditioner.
- An air conditioner is known in which the upper air volume of the fan is set higher than the heat exchanger temperature at the start of heating operation, and the upper air volume of the fan is set lower when stable (see JP-A-5-87391). .
- This type of air conditioner may be provided with a high-temperature air mode that blows a high-temperature air than a general heating mode as a heating function.
- the rotational speed of the fan may rapidly decrease.
- the temperature of the condenser increases.
- the compressor stops. It should be noted that the same problem may occur when the operation mode is switched from the normal heating mode to the high temperature air mode as well as when the operation mode is switched from the high temperature air mode to the normal heating mode.
- An object of the present invention is to provide an air conditioner that suppresses an excessive increase in refrigerant pressure.
- the air conditioner according to the first aspect of the present invention includes an indoor fan, an indoor heat exchanger, a setting unit, and a control unit.
- the indoor heat exchanger exchanges heat between the refrigerant and room air to generate conditioned air.
- the setting unit sets the operation mode.
- the control unit controls the rotation speed of the indoor fan.
- the control unit sets the operation mode to the first heating mode when the operation mode is switched from one of the first heating mode and the second heating mode in which conditioned air having a higher temperature than the first heating mode is generated to the other.
- the rotational speed is lowered at a second speed that is lower than the first speed, which is the speed at which the rotational speed is reduced.
- the control unit when the operation mode is switched from one of the first heating mode and the second heating mode to the other, the control unit does not decrease the rotational speed at the first speed. No, reduce the rotation speed at the second speed. Thereby, the excessive raise of the refrigerant
- the control unit when the operation mode is switched from one of the first heating mode and the second heating mode to the other, the control unit is preset with a value related to the refrigerant pressure. If it is higher than the threshold value, the rotational speed is decreased at the second speed. If the value relating to the refrigerant pressure is less than or equal to the threshold value, the rotational speed is decreased at the first speed. That is, the control unit controls the rotation speed based on the value related to the refrigerant pressure.
- the rotational speed can be reduced at a speed suitable for the refrigerant pressure.
- the air conditioner according to the third aspect of the present invention further includes a condenser and a temperature sensor.
- the temperature sensor detects the temperature of the condenser. If the output value of the temperature sensor is higher than the threshold value as the value related to the refrigerant pressure, the control unit decreases the rotational speed at the second speed.
- the control unit decreases the rotational speed at the second speed, so the air conditioner does not include a pressure sensor. Good.
- the air conditioner according to the fourth aspect of the present invention further includes a compressor and a pressure sensor.
- the pressure sensor detects the refrigerant pressure on the discharge side of the compressor. If the output value of the pressure sensor is higher than the threshold value as the value related to the refrigerant pressure, the control unit decreases the rotational speed at the second speed.
- control unit decreases the rotational speed at the second speed if the output value of the pressure sensor is higher than the threshold value. Therefore, the rotation speed of the indoor fan can be controlled with higher accuracy.
- the control unit repeats the section for maintaining the rotational speed and the section for decreasing the rotational speed, thereby reducing the rotational speed to the target rotational speed as a whole at the second speed. Lower. That is, the control unit lowers the rotational speed to the target rotational speed at the second speed by lowering the rotational speed stepwise.
- simplification of control by a program can be expected.
- the air conditioner according to the first aspect of the present invention it is possible to suppress an excessive increase in the refrigerant temperature in the indoor heat exchanger.
- the rotational speed can be reduced at a speed suitable for the refrigerant pressure.
- the air conditioner may not include a pressure sensor.
- the rotational speed of the indoor fan can be controlled with higher accuracy.
- simplification of control by a program can be expected.
- Air Conditioner 204 Compressor 301 Indoor Heat Exchanger 302 Indoor Fan 310 Control Unit
- FIG. 1 is a diagram for explaining an example of the configuration of the air conditioner 100.
- the air conditioner 100 includes an air conditioning outdoor unit 200 as a heat source side unit and an air conditioning indoor unit 300 as a use side unit.
- the air-conditioning outdoor unit 200 and the air-conditioning indoor unit 300 are connected to each other via a liquid refrigerant refrigerant communication pipe 101 and a gas refrigerant refrigerant communication pipe 102.
- the refrigerant circuit of the air conditioner 100 includes an air conditioning outdoor unit 200, an air conditioning indoor unit 300, a refrigerant communication pipe 101, and a refrigerant communication pipe 102. More specifically, the refrigerant circuit includes an expansion valve 203, a compressor 204, a four-way switching valve 205, an accumulator 206, an outdoor heat exchanger 207, and an indoor heat exchanger 301.
- the air conditioning indoor unit 300 includes an indoor heat exchanger 301 and an indoor fan 302.
- the indoor heat exchanger 301 is, for example, a cross fin type fin-and-tube heat exchanger configured by heat transfer tubes and a large number of fins.
- the indoor heat exchanger 301 functions as a refrigerant evaporator during cooling operation to cool indoor air, and functions as a refrigerant condenser during heating operation to heat indoor air. That is, conditioned air is generated by exchanging heat between the refrigerant and room air. The produced conditioned air is blown out from the air outlet (not shown) of the air conditioning indoor unit 300.
- the indoor fan 302 is connected to a fan motor 330 (see FIG. 2). When the indoor fan 302 is rotated by driving the fan motor 330, indoor air is supplied to the indoor heat exchanger 301.
- the air conditioning outdoor unit 200 includes a gas refrigerant pipe 201, a liquid refrigerant pipe 202, an expansion valve 203, a compressor 204, a four-way switching valve 205, an accumulator 206, and an outdoor heat exchange. And an outdoor fan 208.
- One end of the gas refrigerant pipe 201 is connected to the gas side end of the outdoor heat exchanger 207, and the other end of the gas refrigerant pipe 201 is connected to the four-way switching valve 205.
- One end of the liquid refrigerant pipe 202 is connected to the liquid side end of the outdoor heat exchanger 207, and the other end of the liquid refrigerant pipe 202 is connected to the expansion valve 203.
- the expansion valve 203 is a mechanism that depressurizes the refrigerant.
- the expansion valve 203 is provided between the outdoor heat exchanger 207 and the refrigerant communication pipe 101.
- the compressor 204 is a hermetic compressor driven by a compressor motor.
- the four-way switching valve 205 is a mechanism that switches the direction in which the refrigerant flows.
- the four-way switching valve 205 connects the refrigerant pipe 201 on the discharge side of the compressor 204 and the gas refrigerant pipe 201 and passes through the accumulator 206.
- the refrigerant pipe on the suction side of the compressor 204 and the refrigerant communication pipe 102 are connected.
- the four-way switching valve 205 connects the refrigerant pipe on the discharge side of the compressor 204 and the refrigerant communication pipe 102 and also accumulator 206. Then, the refrigerant pipe on the suction side of the compressor 204 and the gas refrigerant pipe 201 are connected.
- the accumulator 206 divides the refrigerant into a gas phase and a liquid phase.
- the accumulator 206 is provided between the compressor 204 and the four-way switching valve 205.
- the outdoor heat exchanger 207 functions as a refrigerant condenser during the cooling operation and functions as a refrigerant evaporator during the heating operation.
- the outdoor fan 208 supplies air to the outdoor heat exchanger 207.
- Air conditioning operation of air conditioner (3-1) Cooling operation The degree of superheat of the refrigerant at the outlet of the indoor heat exchanger 301 (that is, the gas side of the indoor heat exchanger 301) is constant as the opening of the expansion valve 203. It has been adjusted to be.
- the connection state of the four-way switching valve 205 during the cooling operation is as already described.
- the refrigerant discharged from the compressor 204 flows into the outdoor heat exchanger 207 through the four-way switching valve 205, dissipates heat to the outdoor air, and condenses.
- the refrigerant that has flowed out of the outdoor heat exchanger 207 expands when it passes through the expansion valve 203. Then, it flows into the indoor heat exchanger 301, absorbs heat from the indoor air, and evaporates.
- (3-2) Heating Operation The opening degree of the expansion valve 203 is adjusted so that the degree of supercooling of the refrigerant at the outlet of the indoor heat exchanger 301 is constant at the target value of the degree of supercooling.
- the connection state of the four-way switching valve 205 during the heating operation is as already described.
- the refrigerant discharged from the compressor 204 flows into the indoor heat exchanger 301 through the four-way switching valve 205, dissipates heat to the indoor air, and condenses.
- the refrigerant that has flowed out of the indoor heat exchanger 301 expands when it passes through the expansion valve 203. Then, it flows into the outdoor heat exchanger 207, absorbs heat from the outdoor air, and evaporates.
- the refrigerant that has flowed out of the outdoor heat exchanger 207 passes through the four-way switching valve 205 and is again sucked into the compressor 204 and compressed.
- FIG. 2 is a diagram illustrating an example of functional blocks of the air conditioning indoor unit 300.
- the air conditioning indoor unit 300 includes a control unit 310, a temperature sensor 320, and a remote controller 340 in addition to the fan motor 330.
- the control unit 310 is a computer composed of an MPU, ROM, RAM, and the like. In the ROM, various threshold values used in flowcharts described later, a lower limit rotational speed described later, and the like are stored in advance.
- the control unit 310 is electrically connected to the temperature sensor 320 and the fan motor 330.
- the control unit 310 serves as a setting unit that sets an operation mode based on a command signal described later.
- the operation mode includes a normal heating mode as an example of the first heating mode and a hot air mode as an example of the second heating mode. That is, the air conditioner 100 includes a normal heating mode and a high temperature air mode as a heating function.
- the blowing temperature in the hot air mode is higher than the blowing temperature in the normal heating mode. That is, in the hot air mode, conditioned air having a higher temperature than that in the normal heating mode is generated.
- the operation mode further includes an air blowing mode and a cooling mode.
- the control unit 310 acquires the output value of the temperature sensor 320 from the temperature sensor 320.
- the controller 310 controls the rotational speed of the indoor fan 302 based on the acquired output value. That is, the fan motor 330 is controlled.
- the control unit 310 sets the lower limit value of the rotational speed if the acquired output value is larger than a preset threshold value. Set. Thereby, the rotation speed of the indoor fan 302 is reduced stepwise.
- the temperature sensor 320 detects the indoor heat exchanger temperature as an example of a value related to the refrigerant pressure.
- the indoor heat exchanger temperature is a temperature in the two-phase region of the indoor heat exchanger 301.
- the temperature sensor 320 transmits the detected indoor heat exchanger temperature to the control unit 310.
- the remote controller 340 transmits a command signal to the control unit 310 by infrared rays based on a user operation.
- the command signal includes a command signal related to setting of the operation mode.
- the user can set the operation mode of the air conditioning indoor unit 300 by operating the remote controller 340.
- FIG. 3 is a diagram illustrating switching between the normal heating mode and the hot air mode.
- the air conditioner 100 has a normal heating mode and a high-temperature air mode as a heating function.
- the operation mode is set to the normal heating mode, if the user requests to turn on the function of the high temperature air mode, the air conditioning indoor unit 300 switches from the normal heating mode to the high temperature air mode.
- the air conditioning indoor unit 300 switches from the high temperature air mode to the normal heating mode. Further, even when a preset time has elapsed since the operation mode was set to the high temperature air mode, the air conditioning indoor unit 300 switches from the high temperature air mode to the normal heating mode.
- FIG. 4 is a diagram for explaining the decreasing speed of the rotational speed of the indoor fan 302.
- the horizontal axis represents time, and the vertical axis represents the number of rotations of the indoor fan 302.
- the rotation speed of the indoor fan 302 drops linearly downward-sloping from the current rotational speed R CUR the target rotational speed R RE. That is, it decreases monotonically in a linear function.
- the rotation speed of the indoor fan 302 continues linearly downward-sloping from the current rotational speed R CUR the target rotational speed R RE. That is, it decreases monotonically in a linear function.
- the rotation speed reduction speed as the first speed is (R CUR -R RE ) / (t5-t1).
- the rotational speed of the indoor fan 302 is decreased at the first speed as shown in the graph g1.
- the rotation speed of the indoor fan 302 a linear function rather than monotonically decreases while repeating sustain period mt and lowering section dec, decreases from the current rotational speed R CUR the target rotational speed R RE. That is, the rotational speed of the indoor fan 302 decreases stepwise.
- the decrease section dec is a section in which the rotation speed of the indoor fan 302 decreases
- the maintenance section mt is a section in which the rotation speed of the indoor fan 302 is maintained.
- the rotation speed of the indoor fan 302 first, the period from time t1 to the time t2, decreases from the current rotational speed R CUR to the first lower limit engine speed R LIM1.
- the first lower limit rotational speed R LIM1 is the rotational speed at a specific fan tap.
- the first lower limit rotation speed R LIM1 is set in advance as a sufficiently allowable rotation speed from the viewpoint of avoiding the stop of the compressor 204.
- the rotation speed of the indoor fan 302 repeats the maintenance interval mt and the decrease interval dec. More specifically, the rotation speed interval of the indoor fan 302 is a maintenance interval mt from time t2 to time t3, and a decrease interval dec from time t3 to time t4.
- the rotation speed of the indoor fan 302 decreases by the second lower limit rotation speed.
- the amount of decrease from the current rotational speed R CUR to the first lower limit rotational speed is smaller than the amount of decrease in each decrease section dec in the repeated section.
- the second speed is slower than the first speed. Further, the speed in each decrease section dec of the graph g2 is the same as the first speed.
- FIG. 5 is a diagram illustrating an example of a flowchart of a lower limit value setting process for the rotational speed of the indoor fan 302. This flowchart is started when the operation mode is switched from the hot air mode to the normal heating mode.
- the variable TEMh indicates the indoor heat exchanger temperature.
- the constant TEMth indicates the threshold value of the indoor heat exchanger temperature.
- the variable RF LIM indicates a lower limit value of the rotation speed of the indoor fan 302.
- the constant RF LIM1 indicates the first lower limit rotation speed.
- the constant RF LIM2 indicates the second lower limit rotation speed.
- the constant RF RE indicates the target rotational speed.
- the target rotation speed is, for example, the rotation speed in the normal heating mode immediately before switching to the high temperature air mode.
- a variable TIM indicates the count value of the timer.
- the constant TIMth indicates a timer threshold value.
- control unit 310 determines whether the variable TEMh is larger than the constant TEMth (step S101). That is, it is determined whether the indoor heat exchanger temperature is larger than a preset threshold value.
- control unit 310 substitutes constant RF LIM1 for variable RF LIM (step S102). That is, the lower limit value of the rotation speed of the indoor fan 302 is set to the first lower limit rotation speed. Thereafter, the control unit 310 lowers the lower limit value of the rotation speed of the indoor fan 302 at regular time intervals. That is, the lower limit value of the rotational speed of the indoor fan 302 is lowered step by step. As a result, the rotational speed is lowered at a second speed slower than the first speed. Specifically, it is as follows.
- the control unit 310 starts a timer (step S103).
- step S104 it is determined whether the variable TIM is greater than or equal to the constant TIMth (step S104). If it is determined that the variable TIM is less than the constant TIMth (NO in step S104), the process waits as it is. On the other hand, if it is determined that the variable TIM is equal to or greater than the constant TIMth (YES in step S104), a value obtained by subtracting the constant RF LIM2 from the variable RF LIM is newly substituted into the variable RF LIM (step S105). That is, the lower limit value of the rotational speed of the indoor fan 302 is decreased by a constant RF LIM2 .
- Control unit 310 determines whether variable RF LIM is equal to or smaller than constant RF RE (step S106). That is, it is determined whether the lower limit value of the rotational speed of the indoor fan 302 has reached the target rotational speed. If controller 310 determines that variable RF LIM is greater than constant RF RE (NO in step S106), control unit 310 resets the timer (step S107) and returns to step S103. If it is determined that the variable RF LIM is equal to or less than the constant RF RE (YES in step S106), the series of processes is terminated. Also, when it is determined in step S101 that the variable TEMh is equal to or less than the constant TEMth (NO in step S101), the series of processes is terminated without performing the lower limit setting process. In this case, the rotational speed of the indoor fan 302 may be reduced at the first speed.
- the control unit 310 reduces the rotational speed at the first speed when the operation mode is switched from the high-temperature air mode to the normal heating mode. Instead, the rotational speed is decreased at a second speed that is slower than the first speed. Thereby, the excessive raise of the refrigerant
- the control unit 310 controls the rotation speed based on the indoor heat exchanger temperature when the operation mode is switched from the high-temperature air mode to the normal heating mode. Specifically, first, it is determined whether the indoor heat exchanger temperature is larger than a preset threshold value. When the indoor heat exchanger temperature is larger than a preset threshold value, the rotational speed is decreased at the second speed. When the indoor heat exchanger temperature is equal to or lower than a preset threshold value, the rotational speed is decreased at the first speed. Since control unit 310 controls the rotational speed based on the indoor heat exchanger temperature, the rotational speed can be reduced at a speed suitable for the refrigerant pressure.
- the controller 310 reduces the rotational speed at the second speed if the output value of the temperature sensor 320 is higher than the threshold value as the indoor heat exchanger temperature. Therefore, the air conditioner 100 does not have to include a pressure sensor.
- control unit 310 repeats the section for maintaining the rotational speed and the section for decreasing the rotational speed, thereby reducing the rotational speed to the target rotational speed as a whole at the second speed.
- the air conditioner 100 includes the temperature sensor 320.
- the air conditioner 100 may include a pressure sensor instead of or in addition to the temperature sensor 320.
- the pressure sensor detects the refrigerant pressure on the discharge side of the compressor 204.
- the control unit 310 acquires the output value of the pressure sensor. Then, the fan motor 330 is controlled according to the acquired output value.
- the control unit 310 may set a lower limit value of the rotation speed if the acquired output value is larger than a preset threshold value. Thereby, since the rotation speed of the indoor fan 302 can be reduced in steps, the rotation speed of the indoor fan 302 can be reduced at the second speed. In this case, for example, the flowchart described in FIG. 5 can be applied.
- the control unit 310 controls the fan motor 330 according to the output value of the pressure sensor, the rotational speed of the indoor fan 302 can be controlled with higher accuracy.
- the control unit 310 determines whether or not the lower limit value of the rotational speed needs to be set according to the refrigerant pressure itself or the indoor heat exchanger temperature correlated with the refrigerant pressure. It may be determined whether or not it is necessary to set the lower limit value of the rotational speed. For example, when the operation mode is switched from the high-temperature air mode to the normal heating mode, if the air volume of the indoor fan 302 in the immediately preceding normal heating mode is lower than the air volume of the indoor fan 302 in the high-temperature air mode, the control unit 310 reduces the air volume of the indoor fan 302 by switching the operation mode, and returns it to the previous set value. At this time, the refrigerant pressure may increase excessively.
- control unit 310 may determine whether or not it is necessary to set the lower limit value of the rotational speed of the indoor fan 302 based on the air volume of the indoor fan 302. More specifically, if the air volume of the indoor fan 302 in the immediately preceding normal heating mode is lower than the air volume of the indoor fan 302 in the high-temperature air mode, the rotational speed of the indoor fan 302 may be decreased stepwise.
- the speed in each decrease section dec of the graph g2 in FIG. 4 is the same as the first speed, but may not be the same as the first speed. For example, it may be slower than the first speed. Thereby, the excessive raise of the refrigerant
- the control unit 310 decreases the rotation speed of the indoor fan 302 at the second speed by decreasing the rotation speed of the indoor fan 302 in a stepwise manner.
- the rotational speed of the indoor fan 302 may be monotonically decreased in a linear function.
- the amount of decrease from the current rotational speed R CUR to the first lower limit rotational speed may be appropriately set according to the current rotational speed R CUR . Further, the amount of decrease from the current rotational speed R CUR to the first lower limit rotational speed may be the same as the amount of decrease in each decrease section dec in the repeat section, or the amount of decrease in each decrease section dec in the repeat section. May be larger.
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Abstract
Description
204 圧縮機
301 室内熱交換器
302 室内ファン
310 制御部
(1)空気調和機の構成
図1は、空気調和機100の構成の一例を説明する図である。空気調和機100は、熱源側ユニットとしての空調室外機200と、利用側ユニットとしての空調室内機300とを含む。空調室外機200と空調室内機300は、液冷媒の冷媒連絡配管101およびガス冷媒の冷媒連絡配管102を介して、互いに接続されている。
(2-1)空調室内機
空調室内機300は、室内熱交換器301と、室内ファン302とを有する。室内熱交換器301は、例えば、伝熱管と多数のフィンとにより構成されたクロスフィン式のフィンアンドチューブ型熱交換器である。室内熱交換器301は、冷房運転時に冷媒の蒸発器として機能して室内空気を冷却し、暖房運転時に冷媒の凝縮器として機能して室内空気を加熱する。すなわち、冷媒と室内空気とを熱交換して調和空気を生成する。生成された調和空気は、空調室内機300の吹出口(図示せず)から吹き出される。室内ファン302は、ファンモータ330(図2参照)に接続されている。室内ファン302がファンモータ330の駆動によって回転すると、室内の空気は、室内熱交換器301に供給される。
空調室外機200は、ガス冷媒配管201と、液冷媒配管202と、膨張弁203と、圧縮機204と、四路切換弁205と、アキュムレータ206と、室外熱交換器207と、室外ファン208とを有する。ガス冷媒配管201の一端は、室外熱交換器207のガス側端部に接続され、ガス冷媒配管201の他端は、四路切換弁205に接続されている。液冷媒配管202の一端は、室外熱交換器207の液側端部に接続され、液冷媒配管202の他端は、膨張弁203に接続されている。
(3-1)冷房運転
膨張弁203の開度は、室内熱交換器301の出口(すなわち、室内熱交換器301のガス側)における冷媒の過熱度が一定になるように、調整されている。冷房運転時の四路切換弁205の接続状態は、既に説明した通りである。
膨張弁203の開度は、室内熱交換器301の出口における冷媒の過冷却度が過冷却度目標値で一定になるように、調節されている。暖房運転時の四路切換弁205の接続状態は、既に説明した通りである。
図2は、空調室内機300の機能ブロックの一例を説明する図である。空調室内機300は、ファンモータ330に加えて、制御部310と、温度センサ320と、リモートコントローラ340とを含む。
図3は、通常暖房モードと高温風モードの切換を説明する図である。既に説明したように、空気調和機100は、暖房機能として、通常暖房モードおよび高温風モードを有する。運転モードが通常暖房モードに設定されている場合に、ユーザから高温風モードの機能オンの要求があれば、空調室内機300は、通常暖房モードから高温風モードに切り換える。
図4は、室内ファン302の回転数の低下速度を説明する図である。横軸は、時間を示し、縦軸は、室内ファン302の回転数を示す。
図5は、室内ファン302の回転数の下限値設定処理のフローチャートの一例を示す図である。本フローチャートは、運転モードが高温風モードから通常暖房モードに切り換えられた場合に開始される。本フローチャートにおいて、変数TEMhは、室内熱交換器温度を示す。定数TEMthは、室内熱交換器温度の閾値を示す。変数RFLIMは、室内ファン302の回転数の下限値を示す。定数RFLIM1は、第1下限回転数を示す。定数RFLIM2は、第2下限回転数を示す。定数RFREは、目標回転数を示す。目標回転数は、例えば、高温風モードに切り換えられる直前の、通常暖房モードでの回転数である。変数TIMは、タイマのカウント値を示す。定数TIMthは、タイマの閾値を示す。
本実施形態の空気調和機100においては、制御部310は、運転モードが高温風モードから通常暖房モードに切り換えられた場合に、第1速度で回転数を下げるのではなく、第1速度よりも遅い第2速度で回転数を下げる。これにより、室内熱交換器301での冷媒温度の過度の上昇を抑制することができる。
本発明の実施形態に適用可能な変形例を説明する。
以上の説明では、空気調和機100は、温度センサ320を備えたが、温度センサ320の代わりに、または温度センサ320に加えて、圧力センサを備えてもよい。圧力センサは、圧縮機204の吐出側での冷媒圧力を検出する。制御部310は、圧力センサの出力値を取得する。そして、取得した出力値に応じて、ファンモータ330を制御する。
以上の説明では、制御部310は、冷媒圧力そのもの、または冷媒圧力に相関する室内熱交換器温度に応じて、回転数の下限値設定の要否を判定したが、他の要素に応じて、回転数の下限値設定の要否を判定してもよい。例えば、運転モードが高温風モードから通常暖房モードに切り換えられた場合に、直前の通常暖房モードでの室内ファン302の風量が、高温風モードでの室内ファン302の風量よりも低ければ、制御部310は、運転モードの切換により、室内ファン302の風量を低下させて、直前の設定値に戻す。このとき、冷媒圧力が過度に上昇する場合があり得る。
以上の説明では、図4のグラフg2の各低下区間decにおける速度は、第1速度と同一であったが、第1速度と同一でなくてもよい。例えば、第1速度よりも遅くてもよい。これにより、室内熱交換器301での冷媒温度の過度の上昇をより抑制することができる。
以上の説明では、制御部310は、室内ファン302の回転数を段階的に下げることにより、室内ファン302の回転数を第2速度で下げたが、段階的に下げなくてもよい。例えば、図4のグラフg3で示したように、室内ファン302の回転数を一次関数的に単調減少させてもよい。
カレント回転数RCURから第1下限回転数までの下げ幅は、カレント回転数RCURに応じて適宜設定されてもよい。また、カレント回転数RCURから第1下限回転数までの下げ幅は、繰り返し区間における各低下区間decでの下げ幅と同一であってもよいし、繰り返し区間における各低下区間decでの下げ幅よりも大きくてもよい。
以上の説明では、運転モードが高温風モードから通常暖房モードに切り換えられた場合を例に挙げたが、運転モードが通常暖房モードから高温風モードに切り換えられた場合にも、制御部310は、室内ファン302の回転数を第2速度で下げてもよい。この場合にも、図5で示したフローチャートを適用することができる。すなわち、運転モードが高温風モードおよび通常暖房モードの一方から他方に切り換えられた場合に、図5で示したフローチャートを適用することができる。
図5では、変数RFLIMが定数RFRE以下であると判定した場合(ステップS106でYES)、またはステップS101において、変数TEMhが定数TEMth以下であると判定した場合に、一連の処理を終了した。しかしながら、制御部310は、これらの条件を満たさなくても、圧縮機204が停止した場合に、一連の処理を終了してもよい。例えば、運転モードが送風モード、または冷房モードに切り換えられた場合に、圧縮機204は停止する。したがって、制御部310は、運転モードが送風モード、または冷房モードに切り換えられた場合に、一連の処理を終了してもよい。すなわち、下限値の設定を解除してもよい。
Claims (5)
- 室内ファン(302)と、
冷媒と室内空気とを熱交換して調和空気を生成する室内熱交換器(301)と、
運転モードを設定する設定部(310)と、
前記室内ファンの回転数を制御する制御部(310)と、
を備え、
前記制御部は、前記運転モードが第1暖房モードおよび前記第1暖房モードよりも高温の前記調和空気が生成される第2暖房モードの一方から他方に切り換えられた場合に、前記運転モードが前記第1暖房モードに設定されている場合の前記回転数の低下速度である第1速度よりも遅い第2速度で前記回転数を下げる、
空気調和機(100)。 - 前記制御部は、前記運転モードが前記第1暖房モードおよび前記第2暖房モードの一方から他方に切り換えられた場合に、冷媒圧力に関する値が予め設定されている閾値よりも高ければ、前記第2速度で前記回転数を下げ、前記値が前記閾値以下であれば、前記第1速度で前記回転数を下げる、
請求項1に記載の空気調和機。 - 凝縮器(301)と、
前記凝縮器の温度を検出する温度センサ(320)と、
をさらに備え、
前記制御部は、前記値として前記温度センサの出力値が前記閾値よりも高ければ、前記第2速度で前記回転数を下げる、
請求項2に記載の空気調和機。 - 圧縮機(204)と、
前記圧縮機の吐出側での前記冷媒圧力を検出する圧力センサと、
をさらに備え、
前記制御部は、前記値として前記圧力センサの出力値が前記閾値よりも高ければ、前記第2速度で前記回転数を下げる、
請求項2に記載の空気調和機。 - 前記制御部は、前記回転数を維持する区間と前記回転数を低下させる区間とを繰り返すことにより、全体として前記第2速度で前記回転数を目標回転数まで下げる、
請求項1から請求項4のいずれか1項に記載の空気調和機。
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Publication number | Priority date | Publication date | Assignee | Title |
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EP3499143A1 (en) * | 2017-12-13 | 2019-06-19 | DENSO THERMAL SYSTEMS S.p.A. | Air conditioning system with coolant pressure management |
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JP6350485B2 (ja) * | 2015-10-30 | 2018-07-04 | ダイキン工業株式会社 | 空気調和機 |
CN106907827A (zh) * | 2017-02-20 | 2017-06-30 | 青岛海信电子设备股份有限公司 | 一种空调ptc电加热器功率控制方法及装置 |
CN107975914B (zh) * | 2017-10-20 | 2020-04-24 | 青岛海尔空调器有限总公司 | 一种电加热控制方法 |
CN107940750B (zh) * | 2017-10-20 | 2020-05-29 | 青岛海尔空调器有限总公司 | 一种电加热装置和空调器 |
US11340003B2 (en) | 2018-08-14 | 2022-05-24 | Hoffman Enclosures, Inc. | Thermal monitoring for cooling systems |
CN110260494A (zh) * | 2019-05-09 | 2019-09-20 | 青岛海尔空调电子有限公司 | 冷却塔的风机控制方法及装置 |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05240492A (ja) * | 1992-11-02 | 1993-09-17 | Hitachi Ltd | ヒートポンプ式空気調和機の運転制御装置 |
JP2014029224A (ja) * | 2012-07-31 | 2014-02-13 | Hitachi Appliances Inc | 空気調和機 |
JP2014153028A (ja) * | 2013-02-13 | 2014-08-25 | Mitsubishi Electric Corp | 空気調和機 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3080187B2 (ja) | 1991-09-27 | 2000-08-21 | 東芝キヤリア株式会社 | 空気調和装置の制御装置 |
US5592058A (en) * | 1992-05-27 | 1997-01-07 | General Electric Company | Control system and methods for a multiparameter electronically commutated motor |
JP3159107B2 (ja) * | 1997-03-07 | 2001-04-23 | ダイキン工業株式会社 | 空気調和機 |
US6526768B2 (en) * | 2001-07-24 | 2003-03-04 | Kryotech, Inc. | Apparatus and method for controlling the temperature of an integrated circuit device |
JP2012007865A (ja) * | 2010-06-28 | 2012-01-12 | Hitachi Plant Technologies Ltd | 冷却システム |
JP2012083039A (ja) * | 2010-10-12 | 2012-04-26 | Daikin Industries Ltd | リモコン及びこれを備えた空気調和機 |
JP2012237482A (ja) * | 2011-05-11 | 2012-12-06 | Panasonic Corp | 空気調和機 |
CN202709387U (zh) * | 2011-10-21 | 2013-01-30 | Lg电子株式会社 | 空气调节器 |
US9732976B2 (en) * | 2014-01-28 | 2017-08-15 | Zhongshan Broad-Ocean Motor Co., Ltd. | Direct power control for constant airflow control with advanced motor system modeling |
CN104913444B (zh) * | 2015-05-29 | 2018-04-27 | 广东美的制冷设备有限公司 | 空调器及其的风速控制方法 |
-
2015
- 2015-10-30 JP JP2015215195A patent/JP6079852B1/ja active Active
-
2016
- 2016-10-27 EP EP16859917.3A patent/EP3370007A4/en active Pending
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05240492A (ja) * | 1992-11-02 | 1993-09-17 | Hitachi Ltd | ヒートポンプ式空気調和機の運転制御装置 |
JP2014029224A (ja) * | 2012-07-31 | 2014-02-13 | Hitachi Appliances Inc | 空気調和機 |
JP2014153028A (ja) * | 2013-02-13 | 2014-08-25 | Mitsubishi Electric Corp | 空気調和機 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3370007A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3499143A1 (en) * | 2017-12-13 | 2019-06-19 | DENSO THERMAL SYSTEMS S.p.A. | Air conditioning system with coolant pressure management |
US11491848B2 (en) | 2017-12-13 | 2022-11-08 | Denso Thermat, Systems S.P.A. | Air conditioning system with coolant pressure management |
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