JP4190099B2 - Control method of air conditioner - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an operation control method for an air conditioner, and more particularly to the prevention of dew condensation at an air outlet that supplies cooled air to a room during a cooling operation for cooling the room.
[0002]
[Prior art]
During cooling operation of the air conditioner, if the humidity in the room is high or the temperature of the air supplied to the room is too low, dew is generated around the air outlet and condensed water drops or white mist is generated in the room. There was a problem such as.
[0003]
In order to prevent such dew, measures such as arranging fleece around the air outlet of the air conditioner to increase the amount of water trapped and arranging a heat insulating material so that cold air and warm air do not contact each other are performed. It was.
[0004]
In Japanese Utility Model Laid-Open No. 64-8146, the relative humidity of the intake air is detected during the cooling operation of the air conditioner, and when the relative humidity reaches a predetermined set value or more, control of the fan air volume and control of the refrigerant circulation rate. Describes a method in which the blown air temperature or the evaporation temperature of the refrigerant is increased to prevent dew condensation.
[0005]
Japanese Patent Laid-Open No. 4-98038 calculates the dew point temperature of the indoor intake air from the evaporation temperature of the indoor heat exchanger, the indoor intake air temperature, and the outdoor intake air temperature during the cooling operation. Calculates the degree of exposure from the temperature difference from the air temperature, calculates the time integral value of the degree of exposure, and stops the compressor or reduces the operating capacity of the compressor when the integral value exceeds a predetermined value. By doing so, it is described that the evaporation temperature of the indoor heat exchanger is raised to prevent the occurrence of dew.
[0006]
[Problems to be solved by the invention]
However, when trying to prevent dew on the structure using flocking or a heat insulating material, design restrictions arise and the manufacturing cost increases.
[0007]
In addition, in any of the above publications, since the control for preventing the dew point based on the dew point is performed, the temperature of the air supplied to the room and the air flow rate are not considered, and the dew point is unnecessarily generated. There was a problem that the operating range for preventing operation was expanded and the operating range where cooling capacity could be sufficiently secured was narrowed.
[0008]
This invention provides the control method of the air conditioner which can extend the range which can be air_conditionaing | cooled operation, performing this prevention with respect to this problem.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 Compressor, condenser, decompressor, refrigeration cycle using an evaporator with variable operating capacity, The evaporator includes a temperature sensor that detects an indoor temperature, a humidity sensor that detects an indoor humidity, and an outdoor air temperature sensor that detects an outdoor temperature, so that the room temperature reaches a set temperature when performing a cooling operation. The air cooled in the air is supplied to the room using a blower with variable air flow, and the operation capacity of the compressor is automatically controlled. In the control method of the air conditioner, A restriction value such that the first capacity <second capacity <fourth capacity <rated capacity is set in the operating capacity of the compressor, and the first predetermined time <third predetermined time <second predetermined time is set at a predetermined time. Time = a predetermined time that is a fourth predetermined time is provided, a first external air temperature set value <a second external air temperature set value is set for the external air temperature, and a first air flow set value < A second air flow rate setting value <a setting value that is the maximum air flow rate is provided, and a humidity is provided with a first humidity setting value> a second setting value; When the blast volume of the blower satisfies a condition smaller than the first blast volume setting value, the operation capacity of the compressor is restricted to the first capacity or less, and the room temperature is the room temperature setting value or less or the outside air temperature is the first. Whether the outside air temperature set value is continuously maintained for the first predetermined time, or the outside air temperature is continuously maintained for the second predetermined time or less, A condition that satisfies any condition of whether the humidity is continuously maintained at a first humidity set value or higher for a third predetermined time and the blowing amount of the blower is smaller than a second blowing amount set value. When satisfying, the operation capacity of the compressor is restricted to the second capacity or less, and the room temperature is continuously kept below the room temperature set value and the outside air temperature is continuously kept below the first outside air temperature set value for the first predetermined time. Or the indoor humidity is continuously higher than the first humidity set value for a third predetermined time. The blown amount of any of the conditions met and the blower if it is operating capacity of the compressor when larger satisfy the second air volume set value Rated capacity The following is regulated, the outside air temperature is continuously maintained below the second outside air temperature set value for the second predetermined time, and the indoor humidity is continuously kept above the second humidity set value for the fourth predetermined time. Since the operation capacity of the compressor is restricted to the fourth capacity or less when the air flow rate of the air blower satisfies the condition that the air flow rate of the air blower is larger than the second air flow rate setting value, it prevents unnecessary exposure. The control is not performed and the cooling operation is performed in a range where no dew is formed.
[0014]
The invention according to claim 2 is a compressor having a variable operating capability, a condenser, a decompression device, a refrigeration cycle using an evaporator, It is equipped with a temperature sensor that detects the temperature of the room and a humidity sensor that detects the humidity of the room, and when performing cooling operation, the air cooled by the evaporator is variable so that the room temperature reaches the set temperature. Was supplied to the room using an air blower and automatically controlled the operating capacity of the compressor. In the control method of the air conditioner, The operating capacity of the compressor is provided with a regulation value such that the first capacity <the second capacity <the rated capacity, and the predetermined time is set as the first predetermined time <the second predetermined time. A first airflow setting value <a second airflow setting value <a setting value that satisfies the maximum airflow amount is provided, and a first humidity setting value is provided for the humidity, When the blast volume of the blower satisfies a condition smaller than the first blast volume setting value, the operation capacity of the compressor is restricted to the first capacity or less, and the room temperature is equal to or less than the room temperature setting value for the first predetermined time. Whether the room humidity is continuously maintained or the indoor humidity is continuously maintained at a value equal to or higher than the first humidity set value for the second predetermined time, and the air blowing amount of the air blower is When the condition smaller than the second air flow rate set value is satisfied, the operation capacity of the compressor is restricted to the second capacity or less, and the room temperature is continuously maintained below the room temperature set value for the first predetermined time. Or the indoor humidity is continuously higher than the first humidity set value for the second predetermined time, and the air flow rate of the blower is the second air flow rate set value. When the larger conditions are met, Rated capacity Since the regulation is as follows, the dew prevention control is not performed unnecessarily, and the cooling operation is performed in a range where no dew is formed.
[0015]
Also, The invention according to claim 3 Compressor, condenser, decompressor, refrigeration cycle using an evaporator with variable operating capacity, Temperature sensor that detects indoor temperature and outdoor air temperature sensor that detects outdoor temperature With When carrying out the cooling operation, the air cooled by the evaporator is supplied into the room by using a blower of variable air flow so that the room temperature reaches the set temperature, and the operation capacity of the compressor is automatically controlled. I did In the control method of the air conditioner, A restriction value such that the first capacity <second capacity <fourth capacity <rated capacity is set in the operating capacity of the compressor, and a predetermined time in which the first predetermined time <the second predetermined time is set in the predetermined time. A first air temperature set value <a second air temperature set value is set as the outside air temperature, and a first air volume set value <second air volume set value <maximum air volume is set as the air flow rate. Set a set value When the blast volume of the blower satisfies a condition smaller than the first blast volume setting value, the operation capacity of the compressor is restricted to the first capacity or less, the room temperature is equal to or lower than the room temperature setting value, and the outside air temperature is the first. Either the outside air temperature set value is continuously maintained for the first predetermined time or the outside air temperature is continuously maintained for the second predetermined time below the second outside air temperature set value. When the air flow rate of the air blower satisfies the above condition and satisfies the condition smaller than the second air flow rate setting value, the operation capacity of the compressor is restricted to the second capacity or less, and the room temperature is less than the room temperature setting value. And satisfy | fills the conditions which the outside temperature maintains the 1st outside temperature setting value or less continuously for 1st predetermined time, and satisfy | fills conditions that the ventilation volume of the said air blower is larger than 2nd ventilation volume setting value The operating capacity of the compressor Rated capacity When the following conditions are satisfied, the outside air temperature is continuously maintained below the second outside air temperature set value for the second predetermined time, and the air blowing amount of the blower is larger than the second air blowing amount set value. Further, since the operation capacity of the compressor is restricted to the fourth capacity or less, the dew prevention control is not performed unnecessarily, and the cooling operation is performed in a range where no dew is formed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a refrigerant circuit diagram, where 1 is a compressor with variable operation capability, 2 is a four-way switching valve, 3 is an outdoor heat exchanger, 4a and 4b are electrically driven whose throttle amount can be arbitrarily adjusted according to a control signal. An expansion valve (pressure reduction device), 5 is a strainer, 6 and 7 are indoor heat exchangers divided into two, and 8 is an accumulator. Yes.
[0018]
The operating capacity of the compressor 1 is automatically controlled so as to reach a magnitude that balances with the air conditioning load of the conditioned room (indoor) within a predetermined range, for example, the temperature between the room temperature and the set temperature. A deviation e and a change Δe of the temperature deviation e are obtained every predetermined period, and a fuzzy calculation is performed from the values of e and Δe to obtain a correction value of the driving ability. Next, there is a method of setting a value obtained by adding this correction value to the current operating capacity as a new operating capacity. However, the setting of the operating capacity of the compressor 1 is not limited to this method, and only from the temperature deviation e. Other methods such as obtaining may be used.
[0019]
The indoor heat exchangers 6 and 7 are connected in series via the electric expansion valve 4b. When the electric expansion valve 4b is in a fully open state, the indoor heat exchangers 6 and 7 are substantially integrated. is there.
[0020]
When the electric expansion valve 4a is fully opened and the throttle amount (pressure reduction amount) of the electric expansion valve 4b is adjusted, the indoor heat exchangers 6 and 7 can function as a condenser and an evaporator (or an evaporator and a condenser). Dehumidifying operation is possible.
In addition, 9 and 10 are mufflers (silencers), 11 is a blower device (propeller fan) for the outdoor heat exchanger, and 12 is a blower device (cross flow fan) for the indoor heat exchanger. The blower 12 uses a DC brushless motor as a motor so that the amount of blown air can be varied substantially linearly.
[0021]
When the state of the four-way switching valve 2 is shown by a solid line (the state shown in the figure) and the electric expansion valve 4b is fully open, the high-temperature and high-pressure refrigerant discharged from the compressor 1 passes through the muffler 9 and the four-way switching valve 2. After condensing in the outdoor heat exchanger 3, evaporates in the indoor heat exchangers 6 and 7 through the electric expansion valve 4 a and the strainer 5, and then sucked into the compressor 1 again through the muffler 10, the four-way switching valve 2 and the accumulator 8. However, the refrigeration cycle indicated by the solid line arrow is circulated.
[0022]
At this time, the refrigerant evaporates in the indoor heat exchangers 6 and 7 to perform the cooling operation (cooling mode), and the cooled air is supplied to the conditioned room by the blower 12.
[0023]
When the electric expansion valve 4a is fully opened, the blower 11 is stopped and the opening degree (throttle amount) of the electric expansion valve 4b is adjusted, the refrigerant discharged from the compressor 1 is condensed in the indoor heat exchanger 6, It evaporates in the indoor heat exchanger 7. Accordingly, the air heated by the blower 12 in the indoor heat exchanger 6 and the air cooled by the indoor heat exchanger 7 are air-mixed and supplied to the conditioned room. Air that is dehumidified and whose throttle amount is controlled by the electric expansion valve 4b and the temperature of the discharge air is controlled is supplied to the conditioned chamber. That is, the dehumidifying operation (dehumidifying mode) is performed, and the amount of throttle of the electric expansion valve 4b is adjusted, so that the dehumidifying operation with a cool feeling and the dehumidifying operation with a warm feeling can be performed.
[0024]
When the four-way switching valve 2 is in the state indicated by the dotted line, the high-temperature and high-pressure refrigerant discharged from the compressor 1 is condensed in the indoor heat exchangers 6 and 7 via the muffler 9, the four-way switching valve 2 and the muffler 10. Then, after evaporating in the outdoor heat exchanger 3 through the strainer 6 and the electric expansion valve 4a, the refrigerant is circulated through the refrigeration cycle indicated by the dotted arrow where it is sucked into the compressor 1 again through the four-way switching valve 2 and the accumulator 8. .
[0025]
At this time, the refrigerant is condensed in the indoor heat exchangers 6 and 7 to perform heating operation, and the heated air is supplied to the conditioned room by the blower 12.
[0026]
FIG. 2 is a schematic block diagram of a control circuit provided in the indoor unit of the air conditioner (unit in which the indoor heat exchanges 6 and 7 are mounted).
[0027]
In this figure, reference numeral 21 denotes a plug to which 100V AC power is supplied, and is connected to a 100V commercial AC power supply. This AC power is supplied to the power supply circuit 23 via the switch 22.
[0028]
Reference numeral 24 is a current fuse, 25 is a rectifier circuit, 26 is a motor power supply, 27 is a control power supply, and 28 is a serial power supply. These components constitute the power supply circuit 23.
[0029]
The current fuse 24 is blown to protect the circuit when the current supplied to the power supply circuit 23 exceeds a predetermined current, and the rectifier circuit 25 converts the AC power obtained through the current fuse 24 into a full wave. The motor power supply circuit (switching power supply circuit) 26 generates a driving power supply for the fan motor (DC sensorless motor) 29 that constitutes the blower 12 and has a switching waveform based on a signal from a microcomputer to be described later. The output voltage is varied between DC12V and DC48V by controlling the ON duty.
[0030]
The control power supply 27 generates and stabilizes the drive power supply (DC5V) of the control unit 30, and the serial power supply 28 transmits a signal (four-way switching valve 2) to be transmitted to the outdoor unit (in which the outdoor heat exchanger 3 is mounted). The switching signal, the setting value of the operating capacity of the compressor 1, etc.) is a circuit for sharing the common line with the AC power supplied to the outdoor unit.
[0031]
Reference numeral 31 denotes a terminal plate. The first terminal, the second terminal, and the third terminal are provided on a resin-made terminal block, and a temperature fuse 32 that melts at a predetermined temperature or more and opens a circuit is provided on the terminal block. It is attached so that the temperature, that is, the temperature of the terminal board 13 can be detected.
[0032]
A normally open contact piece 37 of the power relay 36 is interposed between the first terminal of the terminal board 31 and the plug 21, and the normally open contact piece 37 is closed by the output of the microcomputer 33 (the driver is not shown). The AC power output from 31 to the outdoor unit is controlled.
[0033]
The second terminal of the terminal board 31 is connected to the plug 21 and is a common line with the third terminal (signal output terminal).
[0034]
The third terminal is a terminal for outputting a signal output from the microcomputer 33 via the serial circuit 28 a and the serial power supply 28.
[0035]
In addition, the 1st terminal-3rd terminal of the terminal board 31 is connected so that the same terminal number may connect with the terminal board of the electric circuit mounted in the outdoor unit of FIG. 3 mentioned later.
[0036]
The thermal fuse 32 is inserted into the drive line of the power relay 36, and when the temperature of the terminal board 31 rises, the power relay 36 is cut off and the normally open contact piece 37 is opened to supply AC power to the outdoor unit. It is a thing to cut off.
[0037]
Reference numeral 39 denotes a wireless remote controller, which performs various settings and function selections such as operation control of the air conditioner and setting of setting values based on the operation of the switch, and the operation signal is provided on the display board 40. Sent to the receiving circuit.
[0038]
The microcomputer 33 receives this operation signal and controls the operation of the air conditioner. The display board 40 displays the operation state of the air conditioner (operation mode such as cooling / heating / drying, set values, room temperature, etc.).
[0039]
Reference numeral 41 denotes a switch board, which is provided with switches for services such as the switch 22 and a test operation switch.
[0040]
An external ROM 42 stores an initial setting value of the microcomputer 33.
[0041]
Reference numerals 43 and 44 denote a temperature sensor for detecting the temperature of the room and a temperature sensor for detecting the temperature of the indoor heat exchanger 7, which are connected to the A / D input terminal of the microcomputer 33. The microcomputer 33 controls the operation of the air conditioner based on these detected temperatures.
[0042]
A humidity sensor 45 detects the humidity in the room and is connected to an A / D input terminal of the microcomputer 33. The microcomputer 33 controls the operation of the air conditioner based on the detected temperature and humidity.
[0043]
A motor drive circuit 47 has an inverter circuit in which switching elements are connected in a three-phase bridge shape. When a DC sensorless motor is used, the output of this inverter circuit is matched with the rotational position of the rotor of the fan motor 29. It is to switch. A signal for switching the output of the inverter circuit is output by the microcomputer 33 judging from the rotational position of the rotor, and the rotational speed of the fan motor 29 is controlled by the voltage of the DC voltage output from the motor power supply 26.
[0044]
The electric expansion valves 4 a and 4 b are configured such that the refrigerant throttle amount is controlled by a built-in drive unit (step motor or the like), and the throttle amount is arbitrarily controlled according to a signal output from the microcomputer 33. Further, when one of the electric expansion valves 4a and 4b is a control target, the rest is fully opened. The electric expansion valves 4a and 4b are controlled so that the temperature of the heat exchanger acting as an evaporator becomes constant.
[0045]
FIG. 3 is a block diagram showing an outline of a control circuit mounted on the outdoor unit, and is connected to the terminal board 31 shown in FIG.
[0046]
In this figure, reference numeral 52 denotes a power circuit, which rectifies and smoothes 100V AC power from the indoor unit obtained through the first and second terminals of the terminal board 51 by double voltage rectification, and a varistor and noise filter. A reactor, a current fuse, etc. are added.
[0047]
The DC power output from the power supply circuit 52 is output to an inverter circuit 53 in which switching elements are connected in a three-phase bridge shape, and a three-phase alternating current of a pseudo sine wave based on the PWM theory (the compressor 1 uses an induction motor). Or after being converted to a system in which the stator winding is energized with the energization pattern corresponding to the rotation position (when the compressor 1 uses a DC brushless motor). , And supplied to the compressor 1.
[0048]
Accordingly, in any case, the operating speed of the compressor 1 can be controlled by changing the rotation speed of the compressor 1.
[0049]
Reference numeral 55 denotes a microcomputer, which forms the control unit 54. Based on the control signal received from the microcomputer 33 of the indoor unit via the third terminal of the terminal board 51 and the serial circuit 56, the microcomputer 55 controls the driving ability (the number of revolutions) of the compressor 1 by the above operation, and further switches four-way. Controls the switching of the valve 2 and the blower 11 (fan motor that drives the propeller fan), and compresses so that the current value detected by a CT (current detector) 58 connected to the current detection circuit 57 does not exceed a predetermined value. The operating capacity of the compressor 1 is controlled so that the temperature of a temperature sensor 59 that detects the temperature of the compressor 1 does not exceed a predetermined value.
[0050]
Reference numeral 60 denotes an outside air temperature sensor that detects the temperature of outside air. The outside air temperature detected by this sensor is transmitted to the microcomputer 33 of the indoor unit via the serial circuit 56.
[0051]
Note that 61 is a temperature sensor that detects the temperature of the outdoor heat exchanger, and 62 is a switching power supply that generates DC power for control.
[0052]
The air conditioner configured as described above starts the cooling operation with the four-way switching valve 2 in the state shown in FIG. At this time, the operating capacity of the compressor 1 reaches the value commensurate with the load of the conditioned room as described above, and the temperature difference between the room temperature and the set value (room temperature deviation e) and the change in the room temperature deviation e. Fuzzy calculation is performed from the minute to obtain a correction value of the driving ability, and the value after the correction to the current driving ability is transmitted to the microcomputer 55 of the outdoor unit so that the driving ability of the compressor 1 reaches this value. To do.
[0053]
At this time, the microcomputer 55 of the outdoor unit automatically sets the range (upper limit) of the operating capacity (number of rotations) of the compressor 1 based on the current value detected by the CT 58, the temperature of the compressor 1 detected by the temperature sensor 59, and the like. A limiting protection function is provided.
[0054]
If the cooling operation is continued, depending on the conditions of the room temperature, the outside air temperature, the humidity, the operating capacity of the compressor, and the air flow rate of the indoor air blower 12, the temperature of the cooled air is lowered and the temperature in the vicinity of the outlet is lowered. It is known to cause. For example, when the room temperature and the outside air temperature are high, the saturated water vapor pressure in the room increases and the moisture content in the air increases. If low-temperature air is supplied in this state, the temperature in the vicinity of the air outlet decreases and dew is generated from the air before cooling. Further, if the room temperature deviation e is large when the air blowing amount (the number of rotations) of the indoor air blower 12 is set to be small, the operating capacity of the compressor 1 is set to be large, so that the evaporation temperature of the evaporator is lowered. Similarly, low-temperature cooling air is supplied indoors and causes dew.
[0055]
The microcomputer 33 of the indoor unit determines that the conditions that cause the exposure are satisfied, and restricts the operating capacity of the compressor 1 to be equal to or lower than the operating capacity at which the exposure occurs. That is, the driving ability is corrected downward so that the driving ability transmitted to the microcomputer 55 of the outdoor unit does not exceed the regulation value, and then transmitted to the microcomputer 55.
[0056]
The conditions under which the microcomputer 33 determines the necessity of prevention of exposure are as follows.
[0057]
(1) Air flow rate of the indoor air blower 12 (number of rotations of the fan motor 29) ≦ first air flow rate setting value: When this condition is satisfied, the upper limit of the driving capability is set to the first capability.
[0058]
The first air flow rate is 1/3 or less of the maximum air flow rate and is arbitrarily set according to the model, and is an air flow rate that is generally referred to as “weak”. The first capability is arbitrarily set according to the model at around 60% of the rated output of the compressor 1.
[0059]
(2) The time when the condition of room temperature <room temperature set value or outside air temperature <first outside air temperature set value is satisfied continuously passes the first predetermined time, or outside temperature <second outside air temperature The time when the condition of the set value is satisfied continuously passes the second predetermined time, or the time when the condition of the indoor humidity ≧ the first humidity set value is satisfied is continuously set to the third time. When the condition of any one of elapse of a predetermined time is satisfied and the condition of the first air flow rate <the air flow rate of the indoor air blower 12 ≦ the second air flow rate setting value is satisfied, the operating capacity of the compressor Set the upper limit to the second ability.
[0060]
The room temperature set value is a temperature at which the air conditioning load increases, and is arbitrarily set around 30 degrees. The first outside air temperature setting value is a temperature at which the air conditioning load increases, and is arbitrarily set around 30 degrees. When the cooling air discharge direction is swung left and right, the first outside air temperature set value is raised by 2 to 3 degrees. The second outside air temperature set value is set to a value that is 2-3 degrees higher than the first outside air temperature set value. The first predetermined time is arbitrarily set around 40 minutes, the second predetermined time is arbitrarily set around 2 hours, and the third predetermined time is arbitrarily set around 1 hour. The first humidity set value is a value that requires a dehumidifying operation, and is arbitrarily set around 80%. The second airflow setting value is arbitrarily set in accordance with the model at around 2/3 of the maximum airflow. The second capacity is arbitrarily set according to the model at around 75% of the rated output of the compressor 1.
[0061]
The first predetermined time is cleared when the condition “room temperature <room temperature set value and outside air temperature <first outside air temperature set value” is canceled, and the second predetermined time is “outside air temperature <second It is cleared when the condition “outside air temperature set value” is canceled, and the third predetermined time is cleared when the condition “indoor humidity ≧ first humidity set value” is canceled.
[0062]
(3) The time when the condition of room temperature <room temperature set value and outside air temperature <first outside air temperature set value is satisfied continuously passes the first predetermined time, or indoor humidity ≧ first humidity Satisfying any one of the conditions in which the set value condition is satisfied and the third predetermined time elapses continuously, and the second blowing amount setting value <the condition of the blowing amount of the indoor blower 12 When satisfying, the upper limit of the operating capacity of the compressor is set to the third capacity.
[0063]
The third capacity is arbitrarily set before and after the rated capacity of the compressor 1.
[0064]
(4) The time when the condition of the outside air temperature <the second outside air temperature setting value is satisfied continuously passes the second predetermined time, and the second air blowing amount setting value <the sending of the indoor air blower 12 The upper limit of the operating capacity of the compressor 1 is set to the fourth upper limit when the fourth predetermined time elapses continuously when the condition of the air volume is satisfied and the indoor humidity ≧ second humidity set value is satisfied. Set to the ability.
[0065]
The second humidity set value is arbitrarily set to a value about 10% lower than the first humidity set value. The fourth predetermined time is arbitrarily set around 2 hours, and this fourth predetermined time is cleared when the condition “indoor humidity ≧ second humidity set value” is canceled. The fourth capacity is arbitrarily set to around 90% of the rated output of the compressor 1
The above-mentioned constants are arbitrarily set optimally based on the capacity of the air conditioner, the maximum operating capacity of the compressor, the maximum air flow rate of the indoor air blower, and the like.
[0066]
When any one of these conditions (1) to (4) is satisfied, the maximum operating capacity of the compressor is limited to each capacity set by the conditions.
[0067]
Therefore, it is possible to suppress discharge of low-temperature cold air that restricts the operation capability of the compressor and causes dew.
[0068]
Next, when the air conditioner does not include an outside air temperature sensor, dew is prevented under the following conditions. The constant uses the same value under the condition that the same value as above can be used.
[0069]
(5) Air flow rate of the indoor air blower 12 (number of rotations of the fan motor 29) ≦ first air flow rate setting value: When this condition is satisfied, the upper limit of the driving capability is set to the first capability.
[0070]
(6) The time when the condition of room temperature <room temperature set value is satisfied continuously passes the first predetermined time, or the time when the condition of indoor humidity ≧ first humidity set value is satisfied Satisfy any condition of continuously elapse of a third predetermined time (corresponding to the second predetermined time of claim 6), and first air flow rate <air flow rate of the indoor air blower 12 ≦ first The upper limit of the operating capacity of the compressor is set to the second capacity when the condition of the air flow rate setting value of 2 is satisfied.
[0071]
(7) The time when the condition of the room temperature <the room temperature set value is satisfied continuously passes the first predetermined time, or the time when the condition of the indoor humidity ≧ the first humidity set value is satisfied Satisfying any condition of continuously elapse of a third predetermined time (corresponding to the second predetermined time of claim 6) and second air flow rate setting value <air flow rate of the indoor air blower 12 When the above condition is satisfied, the upper limit of the operating capacity of the compressor is set to the third capacity.
[0072]
When any one of these conditions (5) to (7) is satisfied, the maximum operating capacity of the compressor is limited to each capacity set by the conditions.
[0073]
Therefore, it is possible to suppress discharge of low-temperature cold air that restricts the operation capability of the compressor and causes dew.
[0074]
Next, when the air conditioner does not include a humidity sensor, dew is prevented under the following conditions. The constant uses the same value under the condition that the same value as above can be used.
[0075]
(8) Air flow rate of the indoor air blower 12 (number of rotations of the fan motor 29) ≦ first air flow rate setting value: When this condition is satisfied, the upper limit of the driving capability is set to the first capability.
[0076]
(9) The time when the condition of room temperature <room temperature set value or outside air temperature <first outside air temperature set value is satisfied continuously passes the first predetermined time, or outside temperature <second outside air temperature Satisfying any one of the conditions in which the set value condition is satisfied and the second predetermined time elapses continuously, and the first air flow rate <the air flow rate of the indoor fan 12 ≦ the second The upper limit of the operation capacity of the compressor is set to the second capacity when the condition of the airflow setting value is satisfied.
[0077]
(10) The time when the condition of room temperature <room temperature set value and outside air temperature <first outside air temperature set value is satisfied continuously passes the first predetermined time, and second air flow rate set value <room The upper limit of the operation capacity of the compressor is set to the third capacity when the condition of the air flow rate of the inner blower 12 is satisfied.
[0078]
(11) The time when the condition of the outside air temperature <the second outside air temperature set value is satisfied continuously passes the second predetermined time, and the second air blowing amount set value <the sending of the indoor air blower 12 When the air volume condition is satisfied, the upper limit of the operation capacity of the compressor 1 is set to the fourth capacity.
[0079]
When any one of these conditions (8) to (11) is satisfied, the maximum operating capacity of the compressor is limited to each capacity set by the conditions.
[0080]
Therefore, it is possible to suppress discharge of low-temperature cold air that restricts the operation capability of the compressor and causes dew.
[0081]
Next, when the air conditioner does not include both the outside air temperature sensor and the humidity sensor, the exposure is prevented under the following conditions. The constant uses the same value under the condition that the same value as above can be used.
[0082]
(12) Air flow rate of the indoor air blower 12 (number of rotations of the fan motor 29) ≦ first air flow rate setting value: When this condition is satisfied, the upper limit of the driving capability is set to the first capability.
[0083]
(13) The time when the condition of room temperature <room temperature set value is satisfied continuously passes the first predetermined time, and the first air flow rate <the air flow rate of the indoor air blower 12 ≦ the second air flow rate When the set value condition is satisfied, the upper limit of the operation capacity of the compressor is set to the second capacity.
[0084]
(14) The time when the condition of room temperature <room temperature set value is satisfied continuously passes the first predetermined time, and the condition of second air flow rate set value <air flow rate of the indoor air blower 12 is satisfied. The upper limit of the operating capacity of the compressor is set to the third capacity.
[0085]
When any one of these conditions (12) to (14) is satisfied, the maximum operating capacity of the compressor is limited to each capacity set by the conditions.
[0086]
Therefore, it is possible to suppress discharge of low-temperature cold air that restricts the operation capability of the compressor and causes dew.
[0087]
When the above conditions are satisfied, the upper limit of the operating capacity of the compressor 1 is substantially regulated regardless of the size of the air conditioning load. It is possible to suppress dew condensation caused by a cold air blow. In addition, when the above dew condition is canceled, normal operation is resumed.
[0088]
【The invention's effect】
As described above, in the control method of the present invention, the maximum operating capacity of the compressor is regulated when the dew condition set based on the air volume of the indoor fan and the size of the air conditioning load is satisfied. It is possible to suppress the dew exposure due to the blowout.
[Brief description of the drawings]
FIG. 1 is a refrigerant circuit diagram showing an embodiment of the present invention.
FIG. 2 is a schematic block diagram of a control circuit provided in the indoor unit.
FIG. 3 is a schematic block diagram of a control circuit provided in the outdoor unit.
[Explanation of symbols]
1 Compressor
2 Four-way selector valve
3 outdoor heat exchanger
4a Electric expansion valve
4b Electric expansion valve
6 Indoor heat exchanger
7 Indoor heat exchanger
43 Temperature sensor
45 Humidity sensor
60 Outside air temperature sensor

Claims (3)

Compressor, condenser, decompression device, refrigeration cycle using evaporator, temperature sensor for detecting indoor temperature, humidity sensor for detecting indoor humidity, and outdoor temperature sensor for detecting outdoor temperature When the cooling operation is carried out , the air cooled by the evaporator is supplied indoors using a blower device of variable air flow rate so that the room temperature reaches the set temperature, and the operation capacity of the compressor is increased. In the control method of the air conditioner that is automatically controlled ,
A restriction value such that the first capacity <second capacity <fourth capacity <rated capacity is set in the operating capacity of the compressor, and the first predetermined time <third predetermined time <second predetermined time is set at a predetermined time. Time = a predetermined time that is a fourth predetermined time is provided, a first external air temperature set value <a second external air temperature set value is set for the external air temperature, and a first air flow set value < A second air flow rate setting value <a setting value that is the maximum air flow rate is provided, and a humidity is provided with a first humidity setting value> a second setting value;
When the blast volume of the blower satisfies the condition smaller than the first blast volume setting value, the operation capacity of the compressor is restricted to the first capacity or less,
Whether the room temperature is continuously below the room temperature set value or the outside air temperature is continuously below the first outside air temperature set value for the first predetermined time, or the outside air temperature is below the second outside air temperature set value for the second predetermined value. Satisfying any of the following conditions: whether the room humidity is continuously maintained for a period of time, or the indoor humidity is continuously maintained for a third predetermined period of time at or above the first humidity set value, and When the air volume satisfies a condition smaller than the second air flow setting value, the operation capacity of the compressor is restricted to the second capacity or less,
Whether the room temperature is lower than the room temperature set value and the outside air temperature is continuously maintained below the first outside air temperature set value for the first predetermined time, or the indoor humidity is higher than the first humidity set value. The operating capacity of the compressor is equal to or less than the rated capacity when satisfying any condition of continuously maintaining for a predetermined time and satisfying the condition that the air volume of the blower is larger than a second air volume setting value. To regulate,
The outside air temperature is continuously maintained below the second outside air temperature set value for the second predetermined time, and the indoor humidity is continuously maintained above the second humidity set value for the fourth predetermined time. Furthermore, the control method of the air conditioner is characterized in that the operating capacity of the compressor is restricted to a fourth capacity or less when the blast volume of the blower satisfies a condition greater than a second blast volume setting value. When carrying out cooling operation with a variable operating capacity compressor, a condenser, a decompression device, a refrigeration cycle using an evaporator, a temperature sensor for detecting the indoor temperature, and a humidity sensor for detecting the indoor humidity , An air conditioner that supplies air cooled by the evaporator to a room using a blower variable type blower so that the operating capacity of the compressor is automatically controlled so that the room temperature reaches a set temperature . In the control method,
A restriction value that satisfies the first capacity <second capacity <rated capacity is provided in the operating capacity of the compressor, and the predetermined time is the first predetermined time <the second predetermined time = the predetermined time that is the fourth predetermined time. Providing a setting value that satisfies the first blowing amount setting value <second blowing amount setting value <maximum blowing amount, and providing a first humidity setting value for the humidity,
When the blast volume of the blower satisfies the condition smaller than the first blast volume setting value, the operation capacity of the compressor is restricted to the first capacity or less,
Either the room temperature is continuously maintained below the room temperature set value for the first predetermined time, or the room humidity is continuously maintained above the first humidity set value for the second predetermined time. When the above-mentioned condition is satisfied and the blast volume of the blower satisfies the condition smaller than the second blast volume setting value, the operation capacity of the compressor is restricted to the second capacity or less,
Either the room temperature is continuously maintained below the room temperature set value for the first predetermined time, or the room humidity is continuously maintained above the first humidity set value for the second predetermined time. When the air flow rate of the air blower satisfies the above condition and the air flow rate of the air blower is larger than the second air flow rate setting value, the operation capacity of the compressor is restricted to a rated capacity or less. Method. When carrying out cooling operation with a variable operating capacity compressor, condenser, decompressor, refrigeration cycle using an evaporator, temperature sensor for detecting the indoor temperature, and outdoor temperature sensor for detecting the outdoor temperature An air conditioner that supplies the air cooled by the evaporator to the room using a blower of variable air flow rate and automatically controls the operating capacity of the compressor so that the room temperature reaches a set temperature. In the control method of
A restriction value such that the first capacity <second capacity <fourth capacity <rated capacity is set in the operating capacity of the compressor, and a predetermined time in which the first predetermined time <the second predetermined time is set in the predetermined time. A first air temperature set value <a second air temperature set value is set as the outside air temperature, and a first air volume set value <second air volume set value <maximum air volume is set as the air flow rate. Set a set value
When the blast volume of the blower satisfies the condition smaller than the first blast volume setting value, the operation capacity of the compressor is restricted to the first capacity or less,
Whether the room temperature is not more than the room temperature set value and the outside air temperature is continuously maintained for the first predetermined time or less than the first outside air temperature set value, or the outside air temperature is not more than the second outside air temperature set value. The operating capacity of the compressor is set to the second when the condition that either one of the blowers is continuously maintained for a predetermined time is satisfied and the blast volume of the blower satisfies the condition smaller than the second blast volume setting value. Regulate below capacity,
Satisfying the condition that the room temperature is lower than the room temperature set value and the outside air temperature is continuously maintained below the first outside air temperature set value for the first predetermined time, and the air volume of the blower is the second air volume When the condition larger than the set value is satisfied, the operation capacity of the compressor is restricted to the rated capacity or less,
When the outside air temperature is continuously maintained below the second outside air temperature set value for the second predetermined time and the air flow rate of the blower satisfies a condition larger than the second air flow rate set value, A control method for an air conditioner, characterized in that the driving ability is restricted to a fourth ability or less.

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