JP3144885B2 - Air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct type air conditioner which controls the air temperature to each room to be air-conditioned by controlling the room temperature.

[0002]

2. Description of the Related Art In recent years, air conditioners have pursued comfortable air conditioning by varying the air volume.

A conventional air conditioner of the duct type which controls the room temperature by controlling the air flow to each room to be air-conditioned is disclosed in Japanese Patent Laid-Open Publication No. Hei 1-102236.

Hereinafter, the conventional example will be described with reference to the drawings. FIG. 7 is a schematic configuration diagram illustrating an example of a conventional air conditioner. Reference numeral 1 denotes an indoor unit main body, which includes an indoor blower 2 and an indoor heat exchanger 3 therein. Reference numeral 4 denotes an outdoor unit main body, which internally includes a compressor 5, an outdoor heat exchanger 6, and an outdoor blower 7 of variable capacity. Further, a compressor controller 8 for changing the capacity of the compressor 5 is provided.

[0005] A duct 10 is provided from the indoor blower 2 to the branch chamber 9, and branch ducts 14, 15, 16 are provided from the branch chamber 9 to each of the air-conditioned rooms 11, 12, 13.
Are arranged respectively. Branch ducts 14, 15, 16
In the middle of the variable air volume units 17, 18, 19
Is installed. The variable air volume units 17, 18, and 19 have dampers 17a, 18a, 19a therein and a motor 17 for driving the dampers 17a, 18a, 19a, respectively.
b, 18b, 19b and motors 17b, 18b, 19b
Is provided with air volume controllers 17c, 18c and 19c for controlling the air flow.

Temperature controllers 20, 21, 22 having room temperature setting units 20a, 21a, 22a and room temperature detectors 20b, 21b, 22b inside the air-conditioned rooms 11, 12, 13 are arranged. Has been established.

In the branch chamber 9, a blow-out air temperature detector 23 is provided.
The apparatus is provided with a blown air temperature setter 23a which is set to be constant during heating.

Next, the operation will be described. Indoor unit 1
The outdoor unit main body 4 is connected to form a well-known refrigeration circuit, and hot air or cold air blown from the indoor unit main body 1 passes through the duct 10 and is branched in the branch chamber 9, and then subjected to air conditioning. Branch ducts 14 to chambers 11, 12 and 13
It is led at 15,16.

The variable air volume units 17, 18, 19 provided in the middle of the branch ducts 14, 15, 16 are:
The difference between the temperature set by the indoor temperature setting devices 20a, 21a, 22a in the temperature controllers 20, 21, 22 and the temperature detected by the indoor temperature detectors 20b, 21b, 22b is used to determine the air volume controller 17c, The motors 17b, 18b, 19b are driven through the
a, 18a, and 19a are changed to change the passing air volume.

The variable air volume units 17, 18, 19
The air volume of the indoor blower 2 changes with the change of the air temperature, and the temperature of the blown air in the branch chamber 9 changes. The temperature change is detected by the blown air temperature detector 23 and the predetermined blown air temperature setting device is set. The compressor controller 8 controls the number of revolutions of the compressor 5 so that the set value of the blower air temperature detector 23 is set to the set value of the blower air temperature detector 23a. When the temperature becomes equal to or lower than the predetermined temperature, or when the temperature becomes equal to or higher than the predetermined temperature at the time of heating, the operation of the compressor 5 is stopped, and then the detection value of the blow-off air temperature detector 23 is set to the predetermined value of the blow-off air temperature setter 23a. In contrast, when the temperature is equal to or higher than the predetermined temperature during cooling or equal to or lower than the predetermined temperature during heating, the compressor 5 is restarted at a predetermined rotation speed.

[0011]

However, in the above configuration, when the load on each of the air-conditioned rooms 11, 12, and 13 is reduced, the air volume controllers 17, 18 and 19 of the variable air volume units 17c, 18c and 19c. Then, the air volume from the indoor unit body 1 decreases, and the blown air temperature approaches the predetermined blow air temperature set value. However, in order to secure the ventilation volume, the minimum opening degree of the variable air volume units 17, 18, 19 is set. Is large, the blown air temperature does not reach the blown air temperature set value, and the operation of the compressor 5 cannot be stopped even if the room temperature of the air-conditioned rooms 11, 12, and 13 reaches the set room temperature. Causes too cold and too warm.

As described above, when the minimum opening degree of the variable air volume units 17, 18, and 19 is large in order to secure the ventilation volume, the operation is continued when there is no load, and the comfort is deteriorated and the wasteful power consumption is wasted. There is a problem that.

When the set values of the indoor temperature setting units 20a, 21a, 22a of the air-conditioned rooms 11, 12, 13 are different or when the indoor loads of the air-conditioned rooms 11, 12, 13 are different, the indoor unit Since the return air of all the air-conditioned rooms 11, 12, and 13 returns to 1, the return air temperature of the air-conditioned room having the largest load is not sufficiently reflected and the blown air temperature reaches the blown air temperature set value. Is faster and all the air-conditioned rooms 11,1
The compressor 5 stops before the temperatures of the compressors 2 and 13 reach the set room temperature, or the frequency of the compressor 5 becomes extremely low.

Thus, each of the air-conditioned rooms 11, 12, 13
When the set values of the indoor temperature setting devices 20a, 21a, 22a are different or when the indoor loads of the air-conditioned rooms 11, 12, 13 are different, all the air-conditioned rooms 11, 12, 13 are quickly set to the room temperature set value. This makes it impossible to do so, which causes a problem of deteriorating comfort.

The present invention solves the problem of the conventional air conditioner. In the variable air flow type air conditioner, when the minimum opening of the variable air flow unit is set to be large in order to secure ventilation, the operation at no load is performed. An object of the present invention is to provide an air conditioner having a function of preventing the air conditioner.

Further, when the set value of the indoor temperature setting device of each room to be air-conditioned is different or when the indoor load of each room to be air-conditioned is different, it is possible to quickly set the room temperature to the set value of all the air-conditioned rooms. It is intended to provide an air conditioner having a function of performing the following.

[0017]

In order to achieve this object, an air conditioner according to the present invention further comprises, in addition to the prior art, a suction air temperature detector for detecting a suction air temperature of an indoor unit body and a suction air temperature detector. CPU having a suction air temperature setting device for setting and controlling a compressor controller
The CPU is configured such that, when the detected value of the suction air temperature detector is higher than the set value of the suction air temperature setting device during cooling, when lower during heating, or when the blowing air temperature detected by the blowing air temperature detector, Performs the capacity control of the compressor such that the temperature of the compressor becomes the set temperature of the blow-off air temperature setter, and the blow-out air temperature is lower than the set temperature of the blow-out air temperature setter. When the temperature is equal to or higher than the predetermined temperature, the compressor is controlled to stop.

Further, if the detected value of the suction air temperature detector is lower than the set value of the suction air temperature setting device during cooling or high during heating, and if the temperature difference is equal to or more than a predetermined value, the compressor Is controlled to stop the operation of.
Further, if the temperature difference is less than the predetermined value and the frequency of the compressor is equal to or more than the predetermined frequency, control is performed to stop the operation of the compressor.

If the frequency of the compressor is lower than a predetermined frequency, the blow-out air temperature detected by the blow-out air temperature detector is set to a preset temperature of the blow-out air temperature setting device. Controlling the capacity of the compressor and controlling the blow-out air temperature to be lower than the predetermined temperature of the blow-out air temperature setter when the cooling air is lower than a predetermined temperature, or when the heating air is higher than a predetermined temperature, and stop the compressor. I do.

The air conditioner of the present invention further includes, in addition to the conventional one, a suction air temperature detector for detecting a suction air temperature of the indoor unit main body and a suction air temperature setting device for setting the suction air temperature. A CPU for controlling a compressor controller, wherein the CPU detects a value of the suction air temperature detector higher than a set value of the suction air temperature setter when cooling, when heating, and when low, the blowing air. The compressor controls the capacity of the compressor so that the temperature of the blown air detected by the temperature detector becomes the set temperature of the blown air temperature setter, and the blown air temperature is compared with the set temperature of the blown air temperature setter. When the temperature is equal to or lower than the predetermined temperature for cooling or equal to or higher than the predetermined temperature for heating, the compressor is controlled to be stopped.

Further, when the detected value of the suction air temperature detector is lower than the set value of the suction air temperature setting device during cooling or high during heating, and when the temperature difference is equal to or more than a predetermined value, the compressor Is controlled to stop the operation of.
Further, if the temperature difference is less than the predetermined value and the frequency of the compressor is equal to or more than the predetermined frequency, control is performed to stop the operation of the compressor.

If the frequency of the compressor is lower than a predetermined frequency, the operation of the compressor is continued for a predetermined time and the blow-off air temperature detected by the blow-off air temperature detector is set to a predetermined value. The capacity control is performed so as to become the set temperature of the air temperature setter, and the blowout air temperature is lower than the predetermined temperature during cooling, compared with the set temperature of the blowout air temperature setter, and is higher than the predetermined temperature during heating. Controls to stop the compressor even within a predetermined time.

[0023]

Since the air conditioner of the present invention has the above-described structure, when the load on the room to be air-conditioned is reduced, the air volume from the indoor unit body is reduced by the air volume controller of the variable air volume unit. Is higher than the set intake air temperature.
If the cooling air is high, if the heating is low, the blown air temperature is lower than the predetermined value during cooling, or lower than the predetermined temperature during heating, compared to the blown air temperature set value. It judges that there is no heating load and stops the compressor.

If the suction air temperature is lower than the set value of the suction air temperature during cooling or high during heating, and if the temperature difference becomes a predetermined value or more, it is determined that the air-conditioned room has no cooling load or heating load. And stop the compressor. Further, if the frequency of the compressor is equal to or more than the predetermined value even if the temperature difference is less than the predetermined value, it is determined that there is no cooling load or heating load, and the compressor is stopped.

For this reason, when the minimum opening of the variable air volume unit is set to a large value in order to secure sufficient ventilation, the compressor is reliably stopped when there is no load, and the deterioration in comfort due to excessive cooling and excessive warming is eliminated. This is to prevent wasted power consumption.

If the temperature of the suction air is lower than the set value of the suction air temperature during cooling or high during heating, and if the temperature difference is less than a predetermined value and the frequency of the compressor is less than a predetermined value, all the air-conditioned air is cooled. In order to continue the operation by judging that the room has not reached the set temperature, if the set value of the room temperature setter of each room to be air-conditioned is different or if the indoor load of each room to be air-conditioned is different, the indoor unit Even if the return air of the conditioned room returns and the return air temperature of the conditioned room with the highest load is not sufficiently reflected, the compressor stops before the temperature of all the conditioned rooms reaches the room temperature set value, or the compressor Prevents the frequency of the air-conditioner from becoming low, and makes it possible to quickly set all the air-conditioned rooms to the room temperature set value.
This prevents the deterioration of comfort.

Further, since the air conditioner of the present invention has the above structure, when the load on the room to be air-conditioned is eliminated, the air volume from the indoor unit body is reduced by the air volume controller of the variable air volume unit. When the suction air temperature is higher than the suction air temperature set value during cooling or when heating is low, the blown air temperature is lower than the predetermined temperature during cooling compared to the blow air temperature set value, or is higher than the predetermined temperature during heating. , It is determined that there is no cooling load or heating load in the room to be conditioned, and the compressor is stopped.

If the intake air temperature is lower than the set value of the intake air temperature during cooling or high during heating, and if the temperature difference becomes a predetermined value or more, it is determined that the air-conditioned room has no cooling load or heating load. And stop the compressor. If the frequency of the compressor is equal to or more than the predetermined value even if the temperature difference is less than the predetermined value, it is determined that there is no cooling load or heating load, and the compressor is stopped.

For this reason, when the minimum opening setting of the variable air volume unit is set to be large in order to secure the ventilation volume, the compressor is reliably stopped at the time of no load, and the deterioration of comfort due to excessive cooling and excessive warming is eliminated. This is to prevent wasted power consumption.

If the temperature of the suction air is lower than the set value of the suction air temperature during cooling or high during heating, and if the temperature difference is less than a predetermined value and the frequency of the compressor is less than a predetermined value, all the air-conditioned air is cooled. In order to determine that the room has not reached the set temperature and continue the operation for a predetermined time, if the set value of the room temperature setting device of each room to be air-conditioned is different or if the indoor load of each room to be air-conditioned is different, Even if the return air of all the air-conditioned rooms returns to the main unit and the return air temperature of the air-conditioned room with the highest load is not sufficiently reflected, the compressor stops before all the air-conditioned rooms reach the room temperature set value, Prevents the frequency of the compressor from becoming extremely low, allows all the conditioned rooms to quickly reach the room temperature set value, and cools and warms the air conditioned rooms that have already reached the room temperature set value. To prevent deterioration of comfort due to excessive

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that the same components as those in the conventional example are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a schematic configuration diagram of an air conditioner according to one embodiment of the present invention. FIG. 2 is a block diagram showing control of the CPU of the compressor controller of the air conditioner of the embodiment, and FIG. 3 is a flowchart showing control of the CPU of the compressor controller of the air conditioner of the embodiment.

In this embodiment, as compared with the conventional example, as shown in FIG. 1, a suction air temperature detector 24 which is located on the suction side of the indoor unit body 1 and detects the suction air temperature, and sets the suction air temperature. Suction air temperature setting device 24
a) and a CPU 31 for controlling the compressor controller 30.

The CPU 31 determines that the detected value 24 of the suction air temperature detector is the same as the suction air temperature setting unit 24a.
When the cooling air temperature is higher than the set value, the air temperature detected by the blow air temperature detector 23 becomes equal to the set temperature of the blow air temperature setting device 23a. The control is performed such that the compressor 5 is stopped when the blown air temperature is lower than a predetermined temperature during cooling or higher than a predetermined temperature during heating as compared with the set temperature of the blown air temperature setting unit 23a.

If the detected value of the suction air temperature detector 24 is lower than the set value of the suction air temperature setter 24a during cooling or high during heating, or if the temperature difference is equal to or more than a predetermined value, Control is performed to stop the operation of the compressor 5. If the temperature difference is less than the predetermined value and the frequency of the compressor 5 is equal to or higher than the predetermined frequency, control is performed to stop the operation of the compressor 5.

If the frequency of the compressor 5 is lower than the predetermined frequency, the blown air temperature detected by the blown air temperature detector 23 becomes the preset temperature of the blown air temperature setting unit 23a. As described above, the control of the capacity of the compressor 5 is performed, and the blown air temperature is compared with the set temperature of the blown air temperature setting device 23a.
When the temperature is equal to or lower than the predetermined temperature during cooling, and when the temperature is equal to or higher than the predetermined temperature during heating, the compressor 5 is controlled to be stopped.

Further, when the operation of the compressor 5 is stopped, the suction air temperature is then reduced to a predetermined temperature for cooling or lower than a predetermined temperature for heating when compared with the set temperature of the suction air temperature setting unit 24a. If possible, the compressor 5
Is controlled to be restarted with a predetermined capacity.

Next, the operation will be described. Except for the control at the time of no load, the control and the basic operation at the time of the normal operation are the same as those of the conventional example, and the description is omitted.

In FIG. 2, reference numeral 31 denotes C of the compressor controller 30.
PU (not shown), blown air temperature setter 2 inside
A blow-off air temperature comparator 32 for comparing the set temperature X set by 3a with the temperature Y detected by the blow-off air temperature detector 23 is provided. Further, a suction air temperature comparator 33 for comparing the set temperature A set by the suction air temperature setting device 24a with the temperature B detected by the suction air temperature detector 24 is provided.

CPU 31 is a blown air temperature comparator 32
The rotational speed of the compressor 5 is varied and the compressor 5 is stopped according to the result of the comparison. Further, the compressor 5 is stopped and restarted based on the comparison result of the suction air temperature comparator 33.

Next, a specific example of this operation is shown in the flowchart of FIG. When the air volume is changed by the variable air volume units 17, 18, and 19, the temperature of the blown air in the branch chamber 9 and the temperature of the suction air of the indoor unit main body change.
Read the temperature set value A of the suction air temperature by a,
In step 41, the suction air temperature detector 24 detects the suction air temperature B, and in step 42, a comparison is made between the temperature setting value A of the suction air temperature and the suction air temperature B. Air temperature B
It is checked whether the air temperature is lower than the suction air temperature set value A during cooling and whether the air temperature is higher during heating.
Proceeding to step 44, the temperature setting value X of the blowing air temperature is read by the blowing air temperature setting device 23a, the blowing air temperature Y is detected by the blowing air temperature detector 23 in step 45, and the blowing air temperature is detected in steps 46 and 47. After comparing the temperature set value X and the blow-out air temperature Y, an instruction of the number of revolutions is given to the compressor 5, and it is checked in a step 48 whether or not the compressor is in a stop area. Returning, if YES, the process proceeds to step 49, where the compressor 5 is stopped.

If YES in step 43,
Proceeding to step 50, the set temperature A of the suction air temperature
And whether the temperature difference between the suction air temperature B and the suction air temperature B is lower than the predetermined temperature t ° C.
Is stopped, and if YES in step 50, step 5
1 to determine whether the frequency of the compressor is equal to or higher than the predetermined frequency F.
To stop.

If NO in step 51, the process proceeds to step 44, in which the temperature setting value X of the blown air temperature is read by the blown air temperature setting device 23a, and step 4 is performed.
In step 5, the blow-out air temperature Y is detected by the blow-out air temperature detector 23. In steps 46 and 47, a comparison is made between the set temperature X of the blow-out air temperature and the blow-out air temperature Y. Give the number instructions, step 4
It is checked whether or not it is in the compressor stop area at 8;
Returning to step 40 again, if YES, step 4
Proceed to 9 to stop the compressor 5.

After the compressor 5 is stopped in step 49, the intake air temperature setting device 2
4a, the set temperature A of the intake air temperature is read, and in step 53, the intake air temperature detector 24 detects the intake air temperature B. In step 54, the set temperature A of the intake air temperature and the intake air temperature B are calculated. After performing a comparative study, it is checked in step 55 whether or not it is in the compressor restart area.
Returning to step 2, if YES, the compressor 5 is restarted in step 56, and then returns to step 40 again.

As described above, in this embodiment, by providing the CPU 31 for controlling the compressor controller 30, the minimum opening setting of the variable air volume units 17, 18, and 19 is set large in order to secure the ventilation volume. When no load is applied, the compressor 5 is stopped without fail, the deterioration of comfort due to excessive cooling or excessive warming is eliminated, and wasteful power consumption is prevented.

When the indoor temperature setting units 20a, 21a, and 22a of the air-conditioned rooms 11, 12, and 13 have different set values and when the indoor loads of the air-conditioned rooms 11, 12, and 13 are different, the indoor unit Even when the return air of all the air-conditioned rooms 11, 12, and 13 returns to the main body 1, even if the return air temperature of the air-conditioned room having the largest load is not sufficiently reflected, the air-conditioned rooms 11, 12, and 13 are set to the room temperature set value. To prevent the compressor 5 from shutting down or the frequency of the compressor 5 from becoming extremely low.
1, 12 and 13 can be quickly set to the room temperature set value to prevent deterioration of comfort.

Hereinafter, another embodiment of the present invention will be described with reference to FIGS. 4, 5, and 6. FIG. In addition, about the thing of the same structure as a conventional example, the same code | symbol is attached | subjected,
Detailed description is omitted.

FIG. 4 is a schematic structural view of an air conditioner according to another embodiment of the present invention. FIG. 5 is a block diagram showing the control of the CPU of the compressor controller of the air conditioner of the embodiment, and FIG. 6 is a flowchart showing the control of the CPU of the compressor controller of the air conditioner of the embodiment.

In this embodiment, as compared with the conventional example, as shown in FIG. 4, a suction air temperature detector 24 which is located on the suction side of the indoor unit body 1 and detects the suction air temperature, and sets the suction air temperature. Suction air temperature setting device 24
a) and a CPU 61 for controlling the compressor controller 60.

The CPU 61 determines that the detected value 24 of the suction air temperature detector is the same as the suction air temperature setting unit 24a.
When the cooling air temperature is higher than the set value, the air temperature detected by the blow air temperature detector 23 becomes equal to the set temperature of the blow air temperature setting device 23a. The control is performed such that the compressor 5 is stopped when the blown air temperature is lower than a predetermined temperature during cooling or higher than a predetermined temperature during heating as compared with the set temperature of the blown air temperature setting unit 23a.

If the detected value of the suction air temperature detector 24 is lower than the set value of the suction air temperature setter 24a during cooling, higher during heating, or if the temperature difference is equal to or more than a predetermined value, Control is performed to stop the operation of the compressor 5. If the temperature difference is less than the predetermined value and the frequency of the compressor 5 is equal to or higher than the predetermined frequency, control is performed to stop the operation of the compressor 5.

If the frequency of the compressor 5 is lower than the predetermined frequency, the operation of the compressor 5 is continued for a predetermined time and the blown air temperature detected by the blown air temperature detector 23 is set in advance. The capacity control is performed so as to be the set temperature of the blown air temperature setter 23a, and when the blown air temperature is equal to or lower than the set temperature of the blown air temperature setter 23a, the cooling air is set to a predetermined temperature or less. When the temperature is equal to or higher than the predetermined temperature, control is performed to stop the compressor 5 even within a predetermined time. Further, when the operation of the compressor 5 is stopped, the suction air temperature is later than the set temperature of the suction air temperature setting unit 24a, if it is higher than a predetermined temperature during cooling or lower than a predetermined temperature during heating, Control is performed such that the compressor 5 is restarted with a predetermined capacity.

Next, the operation will be described. Except for the control at the time of no load, the control and the basic operation at the time of the normal operation are the same as those of the conventional example, and the description is omitted.

In FIG. 2, reference numeral 61 denotes the C of the compressor controller 60.
PU (not shown), blown air temperature setter 2 inside
A blow-off air temperature comparator 62 for comparing the set temperature X set by 3a with the temperature Y detected by the blow-out air temperature detector 23 is provided. Further, a suction air temperature comparator 63 for comparing the set temperature A set by the suction air temperature setting device 24a with the temperature B detected by the suction air temperature detector 24 is provided. Also,
The timer 64 is built in.

CPU 61 is a blown air temperature comparator 62
The rotational speed of the compressor 5 is varied and the compressor 5 is stopped according to the result of the comparison. Further, the compressor 5 is stopped and restarted according to the comparison result of the suction air temperature comparator 63. Also, the blown air temperature comparator 62
The timer 64 is operated and the compressor 5 is stopped based on the comparison result of the above and the comparison result of the suction air temperature comparator 63.

Next, a specific example of this operation is shown in the flowchart of FIG. When the air volume changes by the variable air volume units 17, 18, and 19, the temperature of the blown air in the branch chamber 9 and the temperature of the suction air of the indoor unit main body 1 change.
4a, the set temperature A of the intake air temperature is read, and at step 71, the intake air temperature B is detected by the intake air temperature detector 24. At step 72, the set temperature A of the intake air temperature and the intake air temperature B are calculated. After performing a comparative study, it is checked in step 73 whether the intake air temperature B has decreased from the intake air temperature set value A during cooling or has increased during heating. Temperature setting device 23a
The temperature set value X of the blow-off air temperature is read by the CPU, the blow-out air temperature Y is detected by the blow-off air temperature detector 23 in step 75, and the temperature set value X of the blow-out air temperature and the blow-out air temperature Y are determined in steps 76 and 77. The compressor 5 is given an instruction of the number of revolutions, and it is checked in step 78 whether or not the compressor is in the compressor stop region. If NO, the process returns to step 70. If YES, the process returns to step 79. The advance timer is reset, and then, in step 80, the compressor 5 is stopped.

If YES in step 73,
Proceeding to step 81, the temperature set value A of the suction air temperature
It is checked whether or not the temperature difference between the suction air temperature B and the suction air temperature B is lower than the predetermined temperature t ° C., and if NO, the process proceeds to step 79 to reset the timer. Thereafter, the compressor 5 is stopped at step 80, and YES is determined at step 81. If there is, the process proceeds to step 82 to check whether the frequency of the compressor is equal to or higher than the predetermined frequency F. If YES, the process proceeds to step 79 to reset the timer, and then the compressor 5 is stopped at step 80.

If NO in step 82, the flow advances to step 83 to check whether the timer is operating. If NO, the operation of the timer is started in step 84, and the flow advances to step 85. If so, proceed to step 85. At step 85, it is checked whether or not a predetermined time H has elapsed since the operation of the timer. If YES, the process proceeds to step 79 to reset the timer, and then, at step 80, the compressor 5 is stopped.

If "NO" in the step 85, the process proceeds to a step 74, wherein the temperature setting value X of the blown air temperature is read by the blown air temperature setting device 23a, and a step 7 is executed.
5, the blow-out air temperature Y is detected by the blow-out air temperature detector 23, and at Steps 76 and 77, a comparison is made between the blow-out air temperature set value X and the blow-out air temperature Y, and then the compressor 5 is rotated. Give the number instructions, step 7
At step 8, it is checked whether or not it is in the compressor stop area. If NO, the process returns to step 70, and if YES, step 79
To reset the timer, and then stop the compressor 5 in step 80.

After the compressor 5 is stopped in step 80, in step 86, the suction air temperature setting device 2
4a, the set temperature A of the intake air temperature is read, the intake air temperature detector 24 detects the intake air temperature B at step 87, and A and B are compared and examined at step 88. It is checked whether or not it is in the compressor restart area. If NO, the process returns to step 86 again. If YES, the compressor 5 is restarted in step 90 and thereafter returns to step 70 again.

As described above, in the present embodiment, by providing the CPU 61 for controlling the compressor controller 60, the minimum opening setting of the variable air volume units 17, 18, and 19 is set large in order to secure the ventilation volume. When no load is applied, the compressor 5 is stopped without fail, the deterioration of comfort due to excessive cooling or excessive warming is eliminated, and wasteful power consumption is prevented. When the set values of the indoor temperature setting units 20a, 21a, 22a of the air-conditioned rooms 11, 12, 13 are different or when the indoor loads of the air-conditioned rooms 11, 12, 13 are different, the indoor unit body 1 Even when the return air of all the air-conditioned rooms 11, 12, and 13 returns and the return air temperature of the air-conditioned room having the largest load is not sufficiently reflected, before all the air-conditioned rooms 11, 12, and 13 reach the room temperature set value. This prevents the compressor 5 from stopping or the frequency of the compressor 5 from becoming extremely low.
It is possible to quickly set the room temperature to 1, 12, and 13 and to prevent deterioration of the comfort due to excessive cooling or overheating of the air-conditioned room, which has already reached the room temperature set value.

[0062]

As described above, in the air conditioner of the present invention, in addition to the prior art, a suction air temperature detector for detecting a suction air temperature of an indoor unit body and a suction air temperature for setting the suction air temperature are provided. A setter is provided, and a CPU that controls a compressor controller is provided.The CPU is configured such that, when a detected value of the suction air temperature detector is higher than a set value of the suction air temperature setter during cooling, When the temperature is low during heating, the compressor is controlled so that the blown air temperature detected by the blown air temperature detector becomes the set temperature of the blown air temperature setting device, and the blown air temperature is controlled by the blown air temperature. When the temperature is lower than a predetermined temperature during cooling or higher than a predetermined temperature during heating, the compressor is controlled to be stopped compared to the set temperature of the temperature setter.

In addition, if the detected value of the suction air temperature detector is lower than the set value of the suction air temperature setting device during cooling or high during heating, and if the temperature difference is greater than or equal to a predetermined value, the compressor Is controlled to stop the operation of.
Further, if the temperature difference is less than the predetermined value and the frequency of the compressor is equal to or more than the predetermined frequency, control is performed to stop the operation of the compressor.

If the frequency of the compressor is lower than a predetermined frequency, the blow-out air temperature detected by the blow-out air temperature detector is set so that the blow-out air temperature becomes a preset temperature set by the blow-out air temperature setting device. Controlling the capacity of the compressor and controlling the blow-out air temperature to be lower than the predetermined temperature of the blow-out air temperature setter when the cooling air is lower than a predetermined temperature, or when the heating air is higher than a predetermined temperature, and stop the compressor. I do.

In the air conditioner of the type in which the temperature of the air blown into the room to be air-conditioned is controlled to be constant by the CPU using the variable air volume method, the case where the minimum opening setting of the variable air volume unit is set large in order to secure the ventilation volume is set. The purpose of the present invention is to surely stop the compressor at the time of load, to prevent deterioration of comfort due to excessive cooling or excessive warming, and to prevent wasteful power consumption.

When the set value of the room temperature setting device of each room to be air-conditioned is different or when the indoor load of each room to be air-conditioned is different, the return air of all the room to be air-conditioned returns to the indoor unit body and the load is the largest. Even if the return air temperature of the conditioned room is not sufficiently reflected,
Prevents the compressor from stopping before all the conditioned rooms reach the room temperature set value, or prevents the frequency of the compressor from becoming extremely low, and enables all the conditioned rooms to quickly reach the room temperature set value. , To prevent deterioration of comfort.

Further, the air conditioner of the present invention further comprises, in addition to the conventional one, a suction air temperature detector for detecting a suction air temperature of the indoor unit body and a suction air temperature setting device for setting the suction air temperature. And a CPU for controlling the compressor controller, wherein the CPU detects when the detected value of the suction air temperature detector is higher than the set value of the suction air temperature setter when cooling or lower when heating. Controlling the capacity of the compressor so that the blown air temperature detected by the blown air temperature detector is equal to the set temperature of the blown air temperature setter, and the blown air temperature is controlled by the blowout air temperature setter. If the temperature is lower than a predetermined temperature during cooling or higher than a predetermined temperature during heating, the compressor is controlled to stop.

Further, if the detected value of the suction air temperature detector is lower than the set value of the suction air temperature setting device during cooling or high during heating, and if the temperature difference is equal to or greater than a predetermined value, the compressor Is controlled to stop the operation of.
Further, if the temperature difference is less than the predetermined value and the frequency of the compressor is equal to or more than the predetermined frequency, control is performed to stop the operation of the compressor.

If the frequency of the compressor is lower than a predetermined frequency, the operation of the compressor is continued for a predetermined time and the blow-out air temperature detected by the blow-out air temperature detector is set to a predetermined value. The capacity control is performed so as to be the set temperature of the blow-off air temperature setter, and the blow-out air temperature is lower than the predetermined temperature during cooling, compared with the set temperature of the blow-out air temperature setter, and is higher than the predetermined temperature during heating. Is controlled to stop the compressor even within a predetermined time.

In the air conditioner of the type in which the temperature of the air blown into the room to be air-conditioned is controlled to be constant by the CPU using the variable air volume method, there is no need to set the minimum opening degree of the variable air volume unit large in order to secure the ventilation volume. The purpose of the present invention is to surely stop the compressor at the time of load, to prevent deterioration of comfort due to excessive cooling or excessive warming, and to prevent wasteful power consumption.

When the set value of the indoor temperature setting device of each room to be air-conditioned is different or when the indoor load of each room to be air-conditioned is different, the return air of all the air-conditioned rooms returns to the indoor unit body and the load is the largest. Even if the return air temperature of the conditioned room is not sufficiently reflected,
Prevents the compressor from stopping before all air-conditioned rooms reach the room temperature set value, or prevents the frequency of the compressor from becoming extremely low, allowing all air-conditioned rooms to quickly reach the room temperature set value. In addition, the comfort of the room to be conditioned, which has already reached the room temperature set value, is prevented from being deteriorated due to excessive cooling or excessive warming.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner according to an embodiment of the present invention.

FIG. 2 is a CPU of a compressor controller of the air conditioner of the embodiment.
Block diagram showing control of

FIG. 3 is a CPU of a compressor controller of the air conditioner of the embodiment.
Flow chart showing the control of

FIG. 4 is a schematic configuration diagram of an air conditioner according to another embodiment of the present invention.

FIG. 5 is a CPU of a compressor controller of the air conditioner of the embodiment.
Block diagram showing control of

FIG. 6 is a CPU of a compressor controller of the air conditioner of the embodiment.
Flow chart showing the control of

FIG. 7 is a schematic configuration diagram of a conventional air conditioner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Indoor unit main body 2 Indoor side blower 3 Indoor side heat exchanger 4 Outdoor unit main body 5 Compressor 6 Outdoor heat exchanger 7 Outdoor blower 8 Compressor controller 10 Duct 11 Air-conditioned room 12 Air-conditioned room 13 Air-conditioned room 17 Variable air volume unit 18 Variable air volume unit 19 Variable air volume unit 17c Air volume control device 18c Air volume control device 19c Air volume control device 23 Outlet air temperature detector 23a Outlet air temperature setter 24 Inlet air temperature detector 24a Inlet air temperature setter 30 Compression Machine controller 31 CPU 60 Compressor controller 61 CPU

Claims (2)

(57) [Claims] A duct-type indoor unit having an indoor heat exchanger and an indoor blower therein; an outdoor unit having a variable capacity compressor, an outdoor heat exchanger and an outdoor blower therein; A duct leading from the indoor unit main body to the outside of the main body, a variable air volume unit for changing a flow rate of air passing through the duct, the air-conditioned room according to an operation mode of an air conditioner, and a room temperature and a set room temperature of the air-conditioned room. An air volume control device that controls the variable air volume unit so that the room temperature matches the set room temperature, a blow air temperature detector that detects the temperature of the blow air from the indoor unit main body, and a blow air temperature setting that sets the blow air temperature. A suction air temperature detector for detecting a temperature of suction air sucked into the indoor unit main body, a suction air temperature setting device for setting suction air temperature, and a compressor. A compressor controller that controls the compressor controller, and a CPU that controls the compressor controller.
If the detection value of the suction air temperature detector is higher than the set value of the suction air temperature setting device during cooling, when heating is low, the blown air temperature detected by the blowout air temperature detector is the blowout air temperature setting. When the capacity control of the compressor is performed so as to reach the set temperature of the compressor, and the blow-out air temperature is lower than the predetermined temperature at the time of cooling, or higher than the predetermined temperature at the time of heating, compared with the set temperature of the blow-out air temperature setter Controlling the compressor to stop, and
If the detection value of the suction air temperature detector is lower than the set value of the suction air temperature setting device during cooling, high during heating, and if the temperature difference is equal to or greater than a predetermined value, the operation of the compressor is stopped. If the temperature difference is less than a predetermined value and the frequency of the compressor is equal to or higher than a predetermined frequency, control is performed to stop the operation of the compressor. If the frequency is less than
The compressor is controlled so that the blown air temperature detected by the blown air temperature detector becomes a preset temperature of the blown air temperature setting device, and the blown air temperature is controlled by the blown air temperature. An air conditioner characterized by controlling the compressor to stop when the temperature is lower than or equal to a predetermined temperature during cooling or higher than or equal to a predetermined temperature during heating as compared with a set temperature of a setter. 2. A duct-type indoor unit having an indoor heat exchanger and an indoor blower therein, an outdoor unit having a variable capacity compressor, an outdoor heat exchanger and an outdoor blower therein. A duct leading from the indoor unit main body to the outside of the main body, a variable air volume unit for changing a flow rate of air passing through the duct, the air-conditioned room according to an operation mode of an air conditioner, and a room temperature and a set room temperature of the air-conditioned room. An air volume control device that controls the variable air volume unit so that the room temperature matches the set room temperature, a blow air temperature detector that detects the temperature of the blow air from the indoor unit main body, and a blow air temperature setting that sets the blow air temperature. A suction air temperature detector for detecting a temperature of suction air sucked into the indoor unit main body, a suction air temperature setting device for setting suction air temperature, and a compressor. A compressor controller that controls the compressor controller, and a CPU that controls the compressor controller.
If the detection value of the suction air temperature detector is higher than the set value of the suction air temperature setting device during cooling, when heating is low, the blown air temperature detected by the blowout air temperature detector is the blowout air temperature setting. When the capacity control of the compressor is performed so as to reach the set temperature of the compressor, and the blow-out air temperature is lower than the predetermined temperature at the time of cooling, or higher than the predetermined temperature at the time of heating, compared with the set temperature of the blow-out air temperature setter. Controlling the compressor to stop, and
If the detection value of the suction air temperature detector is lower than the set value of the suction air temperature setting device during cooling, high during heating, and if the temperature difference is equal to or greater than a predetermined value, the operation of the compressor is stopped. If the temperature difference is less than a predetermined value and the frequency of the compressor is equal to or more than a predetermined frequency, control is performed to stop the operation of the compressor, and the frequency of the compressor is set to a predetermined value. If the frequency is less than
The operation of the compressor is continued for a predetermined period of time, and the capacity control is performed so that the blown air temperature detected by the blown air temperature detector becomes a preset temperature of the blown air temperature setter, and When the blown air temperature is lower than a predetermined temperature during cooling, or lower than a predetermined temperature during heating, even if within a predetermined time, the compressor is stopped so as to stop the compressor when compared with the set temperature of the blown air temperature setting device. An air conditioner characterized by controlling a machine controller.