JPH05296519A - Air conditioner - Google Patents

Abstract

PURPOSE:To provide a variable capability air conditioner wherein a measured result of rated capability thereof defined by JIS falls between maximum capability and a minimum capability, and any inconvenience in practical use is eliminated. CONSTITUTION:A frequency controller 19 reads thereinto a set temperature Ts set by a remote controller 17, the amount of air Fan of an indoor fan, and room temperature Ti and fresh air temperature To detected by a room temperature sensor 14 and a fresh air temperature sensor 20. Upon heating operation, the room temperature Ti and the fresh air temperature To so read in fall within a predetermined range including rated capability measurement reference temperature, and the set temperature Ts and the amount of air Fan are set to rated capability measurement conditions, and further when the set conditions are continued for a predetemined time, the frequency of a compressor 3 is altered to a predetermined rated frequency between maximum and minimum frequencies.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having a control device for measuring a rated capacity and capable of varying the capacity by a frequency conversion system.

[0002]

2. Description of the Related Art In recent years, a variable capacity air conditioner based on a frequency conversion system has become the mainstream of an air conditioner, which has a large energy saving effect, a remarkable improvement in comfort, and an efficient control. By combining a high-efficiency inverter for an air conditioner and a capacity proportional control compressor, the operating frequency can be varied within a range of 30 to 90 Hz, for example.

By the way, in the air conditioner, it is obligatory to confirm the rated capacity and performance under the conditions of temperature and humidity inside and outside defined by JIS. In this type of variable capacity air conditioner, the measurement standard of the rated capacity is the maximum under the condition that the indoor temperature is 27 ° C and the outdoor temperature is 35 ° C, and the indoor temperature is 21 ° C and the outdoor temperature is 7 ° C during the heating operation. It is defined as the ability when it is set so that it can exert its ability.

As a control device for measuring the rated capacity of an air conditioner which varies its capacity by a conventional frequency conversion method, there is one disclosed in Japanese Examined Patent Publication No. 23779/1990.
Hereinafter, a conventional control device for measuring the rated capacity will be described with reference to the drawings.

FIG. 6 is a refrigeration cycle and control block diagram of a conventional air conditioner, FIG. 7 is a flow chart showing an operation of a conventional air conditioner speed command device during a cooling operation, and FIG. FIG. 8B is a characteristic diagram showing variable capacity control during cooling operation of the conventional air conditioner, and FIG. 8B is a characteristic diagram showing variable capacity control during maximum frequency change during cooling operation of the conventional air conditioner.

In FIG. 6, 1 is an outdoor unit, 2 is an indoor unit, and the outdoor unit 1 has a scroll type variable speed compressor 3, a four-way valve 4, an outdoor heat exchanger 5 and an outdoor blower fan 6. The indoor unit 2 has a decompression device 7, an indoor heat exchanger 8, and an indoor blower fan 9.

Reference numeral 10 denotes a remote controller, which has a cooling / heating switching switch 11 for switching between cooling operation and heating operation, and a room temperature setting switch 12 capable of setting a temperature between 16 ° C and 31 ° C. 1
A speed command device 3 receives the room temperature detected by the room temperature sensor 14 and the setting of the remote controller 10, determines the inverter frequency fo, and outputs the speed setting voltage Vs corresponding thereto.

Reference numeral 15 is a commercial power source, and here, three-phase 20
It is 0V. 16 is an inverter unit, which is a commercial power supply 15
Is a power supply circuit that rectifies the three-phase alternating current supplied from the device and generates the three-phase alternating current of the corresponding inverter frequency fo (30 to 90 Hz) by the speed setting voltage Vs output from the speed command device 13. As a result, the variable speed compressor 3 operates at the frequency fo.

Next, the operation of the speed command device 13 will be described with reference to the flowchart of FIG. 7 by taking the cooling operation as an example.

First, in step 1, the room temperature sensor 1
The detected indoor temperature Ti of 4 and the set temperature Ts set by the remote controller 10 are read. Next, in step 2, it is determined whether it is a heating operation or a cooling operation. Next, in step 3, when it is determined in step 2 that the cooling operation is performed, it is determined whether the indoor temperature read in step 1 is higher or lower than 28 ° C. Next, at step 4, when the detected temperature at step 3 is higher than 28 ° C., the difference between the indoor temperature Ti and the set temperature Ts (Ti−
Calculate Ts). Next, in step 5, the output frequency of the inverter is changed from the maximum value (90 Hz) to the minimum value (30 Hz).
8 (a), calculated in step 4 (Ti
-Select the frequency to which Ts) belongs.

Next, when it is determined in step 3 that the detected temperature is lower than 28 ° C., the difference (Ti-Ts) between the room temperature Ti and the set temperature Ts is calculated in step 6 as in step 4. Next, in step 7, the maximum value of the output frequency of the inverter is changed from the maximum value (90 Hz) to the minimum value (30 H
FIG. 8 shows the rated value (60 Hz) set during z).
From (b), the frequency to which (Ti-Ts) calculated in step 6 belongs is selected. Next, in step 8, the speed setting voltage Vs corresponding to the frequency selected in steps 5 and 7 is output to the inverter unit 16.

That is, when the indoor temperature is higher than 28 ° C. during the cooling operation by the speed command device 13, the inverter frequency fo is between the maximum value (90 Hz) and the minimum value (30 Hz) from FIG. The frequency to which the difference (Ti-Ts) between the temperature Ti and the set temperature Ts belongs is selected, and the variable speed compressor 3 is driven at this inverter frequency fo.

If the room temperature is lower than 28 ° C., which includes the JIS rated capacity measurement temperature, the inverter frequency f
The maximum value of o is from the maximum value (90Hz) to the minimum value (30H
changed to the rated value (60Hz) set during z),
That is, the inverter frequency fo is the rated value (60 Hz)
8B, the frequency to which the difference (Ti-Ts) between the indoor temperature Ti and the set temperature Ts belongs is selected between the minimum value (30 Hz) and the variable speed compressor 3 at this inverter frequency fo. Driven.

[0014]

However, in the above-mentioned conventional air conditioner, the maximum capacity is limited by the speed command device 13 when the room temperature falls within a predetermined range including the rated capacity measurement temperature in JIS, The ability of the air conditioner originally cannot be exhibited. Today, there is a wide variety of needs for air conditioners. For example, when the air-conditioning load is large during the cooling operation, such as on a hot summer day, the room temperature in the OA room, etc.
When it is desired to keep the temperature below the rated capacity measurement temperature in IS, the conventional air conditioner cannot exhibit its maximum capacity, and there is a risk of insufficient capacity.

Further, depending on the installation condition of the air conditioner, for example, when the air conditioner is installed near a window and is affected by sunlight, the temperature detected by the room temperature sensor of the air conditioner causes the surrounding area where the occupant is present. The actual room temperature becomes low, that is, in the heating operation, the room temperature sensor detection temperature of the air conditioner may be required to be higher than the JIS rated capacity measurement temperature. In such a case, the conventional air conditioner cannot exhibit its maximum capacity, and the capacity may be insufficient when the air-conditioning load is large on a midwinter day.

Therefore, as the air conditioning capacity, the maximum capacity can be always exerted under all conditions in practical use.
When measuring the rated capacity at S, an air conditioner capable of changing the rated capacity between the maximum capacity and the minimum capacity to a predetermined rated capacity is required.

The present invention solves the conventional problems, and makes it possible to set the measurement result of the rated capacity in JIS in heating operation to a value between the maximum capacity and the minimum capacity, and in actual use. It is an object of the present invention to provide an air conditioner with variable capacity that does not have the above problems.

Another object of the present invention is JIS in air-cooling operation.
(EN) It is possible to provide a variable capacity type air conditioner that makes it possible to set the rated capacity measurement result at a value between the maximum capacity and the minimum capacity, and that has no problems in actual use.

[0019]

To achieve this object, an air conditioner of the present invention comprises a remote controller for setting the room temperature and the air volume of an indoor blower, a room temperature sensor for detecting the room temperature,
Air capable of varying the air conditioning capacity between the maximum capacity and the minimum capacity based on the difference between the room temperature of the air-conditioned room detected by the room temperature sensor and the set temperature set by the remote controller, which detects the outside temperature. In a harmony machine, during heating operation, the room temperature of the remote controller and the air volume of the indoor blower are set to the rated capacity measurement condition in heating operation, and the room temperature sensor and the outside air temperature sensor measure the rated capacity in heating operation. The control device is configured to change the air-conditioning capacity to a preset rated capacity for heating operation between the maximum capacity and the minimum capacity after a predetermined time after reaching a predetermined range including the reference temperature.

Further, during the cooling operation, the room temperature of the remote controller and the air flow rate of the indoor blower are set to the rated capacity measuring condition in the cooling operation, and the room temperature sensor and the outside air temperature sensor are set in the cooling operation. The control device is configured to change the air conditioning capacity to a preset rated capacity in the cooling operation between the maximum capacity and the minimum capacity after a predetermined time after reaching a predetermined range including the rated capacity measurement reference temperature.

[0021]

Since the air conditioner of the present invention has the above-mentioned configuration, the setting of the room temperature of the remote controller and the air volume of the indoor blower during heating operation are set so that the maximum capacity in heating operation can be exerted. And the outdoor temperature is set to a predetermined range including the inside / outside temperature condition in the heating operation defined by JIS, and this state is continued for a predetermined time, so that the air conditioning capacity is preset between the maximum capacity and the minimum capacity. It can be changed to the rated capacity for operation.

Further, during the cooling operation, the room temperature of the remote controller and the air volume of the indoor blower are set so that the maximum capacity in the cooling operation can be exhibited, and the indoor temperature and the outdoor temperature are set according to JIS. It is possible to change the air conditioning capacity to a preset rated capacity in the cooling operation between the maximum capacity and the minimum capacity by setting a predetermined range including the inside / outside temperature conditions in the above and continuing this state for a predetermined time. ..

Therefore, even if the room temperature falls within a predetermined range including the rated capacity measurement temperature in JIS heating or cooling operation, other conditions such as the room temperature setting of the remote controller, the air volume setting of the indoor blower, and the outdoor temperature are It is set to the rated capacity measurement condition in the heating or cooling operation in the above JIS, and if it is not continued for a predetermined time (for example, 30 minutes), the air conditioning capacity is changed to the rated capacity in the heating or cooling operation. Absent. In other words, in actual use, it is impossible to continue for a predetermined time under this condition, so there is no problem in actual use, and the air conditioning capacity can always be exerted up to the maximum capacity above the rated capacity, and comfortable air conditioning can be performed.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the air conditioner of the present invention will be described below with reference to the drawings. It should be noted that the same configurations as those of the related art will be denoted by the same reference numerals and detailed description thereof will be omitted. FIG. 1 is a refrigeration cycle and control block diagram of an air conditioner according to a first embodiment of the present invention, FIG. 2A is a characteristic diagram showing variable capacity control during heating operation of the same embodiment, FIG.
FIG. 3B is a characteristic diagram showing variable capacity control during cooling operation of the embodiment, and FIG. 3 is a flowchart showing operation of the frequency control device of the embodiment.

In FIG. 1, 1 is an outdoor unit, 2 is an indoor unit, and the outdoor unit 1 has a scroll type variable speed compressor 3, a four-way valve 4, an outdoor heat exchanger 5 and an outdoor blower fan 6. .. The indoor unit 2 has a decompression device 7, an indoor heat exchanger 8, and an indoor blower fan 9.

Reference numeral 17 denotes a remote controller, which includes a cooling / heating switching switch 11 for switching between cooling operation and heating operation, a room temperature setting switch 12 capable of setting a temperature between 16 ° C. and 31 ° C., and an air quantity of the indoor blower fan for strong air / medium air / It has an air volume setting switch 18 for switching between weak winds. Reference numeral 19 denotes a frequency control device, which is based on the difference between the room temperature Ti detected by the room temperature sensor 14 during normal operation and the set temperature Ts set by the room temperature setting switch 12 of the remote controller 17, and is shown in FIG.
(Maximum frequency is 95 Hz) From Fig. 2 during cooling operation
The inverter frequency fo is determined from (b) (the maximum frequency is 75 Hz). Also, during heating operation, the room temperature sensor 14
After a predetermined time, the inverter frequency fo is changed to the rated frequency (75 Hz) in the heating operation depending on the room temperature detected by the external temperature sensor, the outdoor temperature detected by the outdoor temperature sensor 20, and the input states of the room temperature setting switch 12 and the air volume setting switch 18 of the remote controller 17. change.

Reference numeral 21 denotes an inverter signal generation circuit, which outputs an inverter waveform signal having an inverter frequency fo determined by the frequency control device 19. Reference numeral 15 is a commercial power source, which is a three-phase 200 V here. An inverter unit 16 is a power supply circuit that rectifies the three-phase alternating current supplied from the commercial power supply 15 and generates the three-phase alternating current of the frequency fo by the inverter waveform signal of the frequency fo output from the inverter signal generation circuit 21. As a result, the variable speed compressor 3 operates at the frequency fo.

The operation of the air conditioner configured as described above will be described below. During the heating operation, when the room temperature, the outside air temperature, and the setting of the remote controller 17 are not the rated capacity measurement conditions in the JIS heating operation, and when the settings are the rated capacity measurement conditions in the JIS heating operation, the predetermined time has not elapsed. At the time of cooling operation, or based on the value Td obtained by subtracting the set temperature Ts from the room temperature Ti during the cooling operation, the frequency selected in the variable capacity control diagram of FIG. The frequency selected in the variable capacity control diagram of 2 (b) is determined as the inverter frequency fo output from the frequency controller 19. For example, during heating operation,
When the room temperature is Ti = 25 ° C and the set temperature Ts = 27 ° C, T
d = −2 ° C., and fo = 85 Hz from FIG.

Next, a method for changing the air conditioning capacity of the air conditioner according to the embodiment to the rated capacity for heating operation will be described with reference to the flowchart of FIG.

First, in step 1, the operation mode set by the remote controller 17, the set temperature Ts, the air volume Fan of the indoor blower fan, the room temperature Ti, and the outside air temperature To are read. Next, in step 2, it is determined whether the operation mode is the heating operation or the cooling operation. Next, when it is determined in step 2 that the heating operation is performed in step 3, the outside air temperature To read in step 1 is 5
Determine whether it is within the rated capacity measurement range of higher than 9 ℃ and lower than 9 ℃.

Next, in step 4, if the outside air temperature is within the rated capacity measurement range in step 3, it is checked whether the room temperature Ti read in step 1 is higher than 19 ° C. and is within the rated capacity measurement range of 23 ° C. or less. Determine. Next step 5
If the room temperature is within the rated capacity measurement range in step 4, it is determined whether the set temperature Ts read in step 1 is set to 31 ° C. which is the maximum temperature that can be set by the remote controller 17.

Next, in step 6, when the set temperature Ts is set to 31 ° C. in step 5, the air volume Fan of the indoor blower fan 9 read in step 1 is set to the remote controller 17.
Determine whether the maximum wind volume that can be set with is set to strong. Here, step 3, step 4, step 5,
When all the conditions in step 6 are satisfied, it is assumed that the rated capacity measurement condition in the heating operation is satisfied. Next, when the rated capacity measurement condition in the heating operation is satisfied, it is determined in step 7 whether the rated capacity measurement timer t1 has counted up after a predetermined time has elapsed.

Next, the rated capacity measuring condition in the heating operation is satisfied, but the predetermined time has not elapsed and the timer t is set in step 7.
If 1 is being counted, the count of the timer t1 is advanced in step 8. Further, if any of the step 3, step 4, step 5, and step 6 deviates from the rated capacity measurement condition in the heating operation, the timer t1 is cleared in step 9.

Next, if the condition deviates from the rated capacity measurement condition in the heating operation or if the rated capacity measurement condition in the heating operation is satisfied but the predetermined time has not elapsed in step 7, "Td =" Room temperature Ti-set temperature T
s "is calculated. Next, at step 11, the inverter frequency fo is determined based on the Td calculated at step 10 from the variable capacity control diagram during the heating operation of FIG. Next, when the rated capacity measuring condition in the heating operation is satisfied and the predetermined time has elapsed in step 7 and the timer t1 counts up,
In step 12, the inverter frequency fo is set to the rated frequency of 75 Hz in the heating operation.

Next, when it is determined in step 2 that the operation mode is the cooling operation, the timer t1 is cleared in step 13. In step 14, "Td = room temperature Ti-set temperature Ts"
To calculate. Next, in step 15, the inverter frequency fo is determined based on the Td calculated in step 14 from the variable capacity control diagram during the cooling operation in FIG. 2B. Next, the inverter frequency fo set in step 11 or 12 or 15 is used as the inverter signal generation circuit 2
Output to 1.

Here, when the JIS rated performance is measured during heating operation in the air conditioner of the present embodiment, first, JI
Depending on the measurement conditions of the rated capacity of S, the temperature of the measurement room is set to 21 ° C at room temperature and 7 ° C at the outside temperature, and the setting temperature is set to that of the room temperature setting switch 12 because it is set to the state of maximum heating capacity. At the maximum set temperature of 31 ° C., the air volume of the indoor blower fan 9 is set to the strong air volume which is the maximum air volume of the air volume setting switch 18.

When the heating operation is started in this state, the frequency control device 19 performs steps 3, 4, 5 and
It is determined in step 6 that the rated capacity measurement condition in the heating operation is satisfied, but in step 7, since the predetermined time has not elapsed, the room temperature is 21 ° C. and the set temperature is 31 ° C. in step 10.
The difference Td = −10 ° C. is calculated.

Based on this Td, step 11 in FIG.
The inverter frequency fo is determined to be 95 Hz from the variable capacity control diagram during heating operation in (a), and the compressor 3 is driven at 95 Hz until a predetermined time has elapsed from the start of operation. Then, when the predetermined time elapses without deviating from the rated capacity measurement condition in the heating operation, it is determined in step 7 that the timer t1 has counted up, and in step 12, the inverter frequency fo is changed to the rated frequency of 75 Hz in the heating operation. ..

As a result, when the JIS rated capacity of the heating operation is measured by the air conditioner of the present embodiment, the compressor 3 is initially driven at the maximum frequency of 95 Hz, but after a lapse of a predetermined time, the compressor 3 becomes 75 Hz. The frequency of is changed. Therefore, the JIS rated capacity of the heating operation is the capacity of the air conditioner in the state of being driven at the rated frequency (75 Hz) preset between the maximum frequency (95 Hz) and the minimum frequency (35 Hz) of the compressor 3. Can be

Further, during normal use, the maximum frequency can always be exerted in the cooling operation, and it is rare that the rated capacity measurement condition in the heating operation set in steps 3 to 6 is satisfied even in the heating operation. Even if the rated capacity measurement condition in the heating operation is satisfied, this state is unlikely to continue for the predetermined time, so there is no problem in practical use.

Therefore, during normal use, the frequency of the compressor 3 can be varied between the highest frequency and the lowest frequency under all conditions including the JIS rated capacity measurement condition. When the indoor load becomes heavy above the rated value on a midwinter day for heating and on a midsummer day for cooling, the frequency of the compressor 3 is increased to the maximum frequency, and the capacity of the air conditioner is exerted up to the maximum capacity above the rated capacity. Therefore, comfortable air conditioning is possible without lack of capacity.

Next, a second embodiment of the air conditioner of the present invention will be described with reference to the drawings. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. FIG. 4 is a refrigeration cycle and control block diagram of an air conditioner according to a second embodiment of the present invention, and a characteristic diagram showing variable capacity control during heating operation in the same embodiment is shown in FIG.
Similar to (a), the characteristic diagram showing the variable capacity control during the cooling operation of the embodiment is similar to FIG. 2 (b), and FIG. 5 is a flowchart showing the operation of the frequency control device of the embodiment.

In FIG. 4, 22 is a frequency control device,
Based on the difference between the room temperature Ti detected by the room temperature sensor 14 during normal operation and the set temperature Ts set by the room temperature setting switch 12 of the remote controller 17, during heating operation, as shown in FIG. 2 (a) (the maximum frequency is 95 Hz), During the cooling operation, the inverter frequency fo is determined from FIG. 2B (the maximum frequency is 75 Hz).

During the cooling operation, depending on the room temperature detected by the room temperature sensor 14, the outside air temperature detected by the outside air temperature sensor 20 and the input states of the room temperature setting switch 12 and the air volume setting switch 18 of the remote controller 17, after a predetermined time, the inverter frequency is reached. Change fo to the rated frequency (65 Hz) in the cooling operation.

In this embodiment, the frequency control device 19 is characterized in that the rated capacity of JIS can be measured in the heating operation of the air conditioner of the first embodiment, and the rated capacity of JIS in the cooling operation can be measured. Frequency control device 2 characterized by being able to perform
It was changed to 2.

The operation of the air conditioner configured as above will be described below. During the cooling operation, when the room temperature, the outside air temperature, and the setting of the remote controller 17 are not the conditions for measuring the rated capacity in the JIS cooling operation, and the setting is JI.
When the predetermined time has not elapsed even under the rated capacity measurement condition of the cooling operation of S, or during the heating operation, based on the value Td obtained by subtracting the set temperature Ts from the room temperature Ti, in the case of the heating operation, FIG. In the cooling operation, the frequency selected in the variable capacity control diagram of a) is determined as the inverter frequency fo output from the frequency controller 22 in the variable capacity control diagram of FIG. 2B. . For example, during heating operation, when the room temperature is Ti = 25 ° C. and the set temperature Ts = 27 ° C., Td = −2 ° C., and fo = 85 from FIG.
It becomes Hz.

Next, a method of changing the air conditioning capacity of the air conditioner according to the embodiment to the rated capacity in the cooling operation will be described with reference to the flowchart of FIG.

First, in step 1, the operation mode set by the remote controller 17, the set temperature Ts, and the indoor blower fan 9 are set.
Air volume Fan, room temperature Ti, and outside air temperature To are read.
Next, in step 2, it is determined whether the operation mode is the heating operation or the cooling operation. Next, in step 3, when it is determined that the cooling operation is performed in step 2, it is determined whether the outside air temperature To read in step 1 is higher than 33 ° C. and is within the rated capacity measurement range of 37 ° C. or lower.

Next, in step 4, when the outside air temperature is within the rated capacity measurement range in step 3, it is checked whether the room temperature Ti read in step 1 is within the rated capacity measurement range of higher than 25 ° C and lower than 29 ° C. Determine. Next step 5
When the room temperature is within the rated capacity measurement range in step 4, it is determined whether the set temperature Ts read in step 1 is set to 16 ° C. which is the lowest temperature that can be set by the remote controller 17.

Next, in step 6, when the set temperature Ts is set to 16 ° C. in step 5, the air volume Fan of the indoor blower fan 9 read in step 1 is the remote controller 17
Determine whether the maximum wind volume that can be set with is set to strong. Here, step 3, step 4, step 5,
When all the conditions in step 6 are satisfied, it is assumed that the rated capacity measurement condition in the cooling operation is satisfied.

Next, when the rated capacity measuring condition in the cooling operation is satisfied, it is determined in step 7 whether the rated capacity measuring timer t1 has counted up after a predetermined time has elapsed.
Next, when the rated capacity measuring condition in the cooling operation is satisfied but the predetermined time has not passed and the timer t1 is counting in step 7, the count of the timer t1 is advanced in step 8. Further, if any of the step 3, step 4, step 5, and step 6 deviates from the rated capacity measurement condition in the cooling operation, the timer t1 is cleared in step 9.

Next, if the rated capacity measurement condition in the cooling operation is deviated or if the rated capacity measurement condition in the cooling operation is satisfied but the predetermined time has not elapsed in step 7, "Td =" Room temperature Ti-set temperature T
s "is calculated. Next, at step 11, the inverter frequency fo is determined based on the Td calculated at step 10 from the variable capacity control diagram during the cooling operation of FIG.

Next, when the rated capacity measurement condition in the cooling operation is satisfied and the predetermined time has elapsed in step 7 and the timer t1 has counted up, in step 12 the inverter frequency f
Set o to the rated frequency of 65 Hz in the cooling operation. Next, when the operation mode is determined to be the heating operation in step 2, the timer t1 is cleared in step 13.

In step 14, "Td = room temperature Ti-set temperature Ts" is calculated. Then in step 15, step 1
Based on Td calculated in step 4, the inverter frequency fo is determined from the variable capacity control diagram during heating operation in FIG. Next, Step 11 or Step 12 or Step 15
The inverter frequency fo set by is output to the inverter signal generation circuit 21.

Here, when the JIS rated capacity is measured during cooling operation in the air conditioner of this embodiment, first, JI
Depending on the measurement conditions of the rated capacity of S, the temperature of the measuring room is set to room temperature of 27 ° C. and the outside air temperature of 35 ° C. Further, the setting temperature of the room temperature setting switch 12 is set because it is set to the state of the highest cooling capacity. At the minimum set temperature of 16 ° C., the air volume of the indoor blower fan 9 is set to the strong air volume of the maximum air volume of the air volume setting switch 18. When the cooling operation is started in this state, the frequency control device 22 performs steps 3, 4, and
It is determined in Steps 5 and 6 that the rated capacity measurement condition in the cooling operation is satisfied, but since the predetermined time has not elapsed in Step 7, the difference between room temperature 27 ° C. and set temperature 16 ° C. Td = Calculate 11 ° C. Based on this Td, in step 11, the inverter frequency fo is determined to be 75 Hz from the capacity variable control diagram during the cooling operation of FIG. 2B, and the compressor 3 is kept at 75 for a predetermined time from the start of operation.
Driven at Hz. When a predetermined time has passed without deviating from the rated capacity measurement condition in the cooling operation, step 7
In step 12, it is determined that the timer t1 has counted up, and in step 12, the inverter frequency fo is changed to the rated frequency of 65 Hz in the cooling operation.

As a result, when the JIS rated capacity of the cooling operation is measured by the air conditioner of the present embodiment, the compressor 3 is driven at the maximum frequency of 75 Hz at first, but when the predetermined time elapses, the compressor 3 becomes 65 Hz. The frequency of is changed. Therefore, the JIS rated capacity of the cooling operation is the capacity of the air conditioner when it is driven at the rated frequency (65 Hz) preset between the highest frequency (75 Hz) and the lowest frequency (35 Hz) of the compressor 3. Can be

Further, during normal use, the maximum frequency can always be exhibited in the heating operation, and it is rare that the rated capacity measurement condition in the cooling operation set in steps 3 to 6 is satisfied even in the cooling operation. Even if the rated capacity measurement condition in the cooling operation is satisfied, this state is unlikely to continue for the predetermined time, so there is no problem in practical use.

Therefore, during normal use, the frequency of the compressor 3 can be varied between the highest frequency and the lowest frequency under all conditions including the JIS rated capacity measurement condition. When the indoor load becomes heavy above the rated value on a midwinter day for heating and on a midsummer day for cooling, the frequency of the compressor 3 is increased to the maximum frequency, and the capacity of the air conditioner is exerted up to the maximum capacity above the rated capacity. Therefore, comfortable air conditioning is possible without lack of capacity.

[0059]

As described above, according to the present invention, the remote controller for setting the room temperature and the air volume of the indoor blower, the room temperature sensor for detecting the room temperature, the outside temperature sensor for detecting the outside temperature, and the room temperature sensor are used for detection. In the air conditioner that can change the air conditioning capacity between maximum capacity and minimum capacity based on the difference between the room temperature of the air-conditioned room and the set temperature set by the remote control, the room temperature of the remote control and the air volume of the indoor blower during heating operation. Is set to the rated capacity measurement condition for heating operation, and the air conditioning capacity is set to the maximum capacity and minimum after a specified time after the room temperature sensor and the outside air temperature sensor reach the specified range including the rated capacity measurement reference temperature in heating operation. Since the air conditioner is equipped with a control device that changes the rated capacity for heating operation that is preset between the capacities, the measurement result of the rated capacity according to JIS for heating operation can be maximized. It provides the possibility and air conditioner ability deformable to between the force and the minimum capacity.

Further, the control device can always exert the maximum air conditioning capacity during the cooling operation, and the detected room temperature and the outside air temperature during the heating operation are within the predetermined range including the rated capacity measurement reference temperature in the heating operation. In addition, the room temperature and the air volume of the indoor blower set by the remote control are set as the rated capacity measurement conditions in heating operation, and the air conditioning capacity is set to the maximum capacity and the minimum capacity only when this state is continued for a predetermined time. During this period, the rated capacity for heating operation was changed to a predetermined value, so that the maximum capacity can always be exerted under all conditions in actual use, so there is no problem in actual use and comfortable air conditioning is possible. You can

Further, during the cooling operation, the room temperature of the remote controller and the air volume of the indoor blower are set to the rated capacity measurement condition in the cooling operation, and the room temperature sensor and the outside air temperature sensor are set to the rated capacity measurement reference temperature in the cooling operation. By including a control device in the air conditioner that changes the air conditioning capacity between the maximum capacity and the minimum capacity to the preset rated capacity in the cooling operation after a predetermined time after reaching the predetermined range including It is possible to provide an air conditioner of variable capacity that makes it possible to make the measurement result of the rated capacity in JIS between the maximum capacity and the minimum capacity.

Further, the control device can always exert the maximum air conditioning capacity during the heating operation, and the detected room temperature and the outside air temperature during the cooling operation are within the predetermined range including the rated capacity measurement reference temperature in the cooling operation. In addition, the room temperature and the air volume of the indoor blower set by the remote control are set as the rated capacity measurement conditions in the cooling operation, and the air conditioning capacity is set to the maximum capacity and the minimum capacity only when this state is continued for a predetermined time. During this period, the rated capacity for cooling operation was changed to a predetermined value, so that the maximum capacity can always be exerted under all conditions in actual use, so there is no problem in actual use and comfortable air conditioning. You can

[Brief description of drawings]

FIG. 1 is a refrigeration cycle and control block diagram in a first embodiment of an air conditioner of the present invention.

FIG. 2 (a) is a characteristic diagram showing variable capacity control during heating operation in the embodiment of the air conditioner of the present invention. FIG. 2 (b) is variable capacity control during cooling operation in the embodiment of the air conditioner of the present invention. Characteristic diagram showing

FIG. 3 is a flowchart showing the operation of the frequency control device for the air conditioner of the embodiment.

FIG. 4 is a refrigeration cycle and control block diagram in a second embodiment of the air conditioner of the present invention.

FIG. 5 is a flowchart showing the operation of the frequency control device for the air conditioner of the embodiment.

FIG. 6 is a refrigeration cycle and control block diagram of a conventional air conditioner.

FIG. 7 is a flowchart showing the operation of the speed command device for a conventional air conditioner during cooling operation.

FIG. 8A is a characteristic diagram showing a variable capacity control during cooling operation of a conventional air conditioner, and FIG. 8B is a characteristic showing a variable capacity control during maximum frequency change of the conventional air conditioner during cooling operation. Figure

[Explanation of symbols]

 9 Indoor blower fan 12 Room temperature setting switch 14 Room temperature sensor 17 Remote control 18 Air volume setting switch 19 Frequency control device 20 Outside air temperature sensor 22 Frequency control device

Claims (2)

[Claims] 1. A remote controller for setting a room temperature and an air volume of an indoor blower, a room temperature sensor for detecting a room temperature, an outside temperature sensor for detecting an outside temperature, a room temperature of an air-conditioned room detected by the room temperature sensor, and The air conditioning capacity is varied between the maximum capacity and the minimum capacity based on the difference from the set temperature set by the remote controller, and the setting of the room temperature of the remote controller and the air volume of the indoor blower during heating operation is the rated capacity during heating operation. The air conditioning capacity is set in advance between the maximum capacity and the minimum capacity after a lapse of a predetermined time after the room temperature sensor and the outside air temperature sensor are set to a predetermined range including the rated capacity measurement reference temperature in the heating operation. An air conditioner equipped with a control device for changing the rated capacity during heating operation. 2. In the cooling operation, the room temperature of the remote controller and the air flow rate of the indoor blower are set to the rated capacity measurement condition in the cooling operation, and the room temperature sensor and the outside air temperature sensor are used to measure the rated capacity in the cooling operation. The control device for changing the air conditioning capacity to a preset rated capacity in a cooling operation between a maximum capacity and a minimum capacity after a predetermined time after reaching a predetermined range including Air conditioner.