JPS5952144A - Operation control of air conditioner - Google Patents

Abstract

PURPOSE:To improve the air conditioning efficiency by a method wherein the feeling of chilliness is prevented from giving to human body due to the descent of blow-off temperature and at the same time the direction of blown-off air is optimized. CONSTITUTION:The room temperature is detected by a thermistor 1 in terms of resistances and sent to a central processing unit (CPU) 5 by being converted into digital data by an A/D converter 2. On the other hand, the blow-off temperature is detected by a thermistor 3 in terms of resistances and sent to CPU5 by being converted into digital data by an A/D converter 4. CPU5 compares said digital data of the A/D converters 2 and 4 with the share of frequencies so as to decide an operating frequency and then to issue the address signal of said operating frequency to a programmable counter 6 in order to invert DC source to AC source with said operating frequency by the control signal from an inverter controller 8 in order to send to a compressor motor 10 to drive a compressor. When the compressor is started at the time t0, the room temperature is below Ts-1 and consequently the share of frequencies depends only on the room temperature or a drive on 75Hz is performed in order to control the room temperature and yet, because the blow-off temperature is also below 37 deg.C, the direction of blown-off air is kept horizontally. When the blow-off temperature exceeds 37 deg.C at the time t1, the direction of blown-off air is changed from the horizontal direction to the downward direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an operation control method for controlling the capacity of an air conditioner.

Conventional configuration and its problems Conventionally, in a heat pump type air conditioner that uses a variable capacity compressor to change the heating capacity, the indoor temperature is detected as a condition for changing the capacity, and as shown in Figure 1. , the capacity level is set based on the difference between the room temperature setting value and the indoor hot water temperature,
In systems that change the capacity depending on the room temperature, that is, by changing the rotation speed of the compressor, the compressor is initially operated at a high rotation speed of F4, and when the room temperature rises and reaches the set value of -13℃, it changes to the next level. Operate at the lower rotation speed F3, and when the room temperature reaches the upper row t7 set value, operate at the next lower rotation speed F2, and when the room temperature rises further and reaches the set value + t2℃, the lowest rotation speed F1. drive. If the room temperature drops while operating at each rotation speed, the rotation speed is increased one step at a time at a temperature one step lower than the rotation speed change temperature when the room temperature rises.

In other words, F1 → F2 at the set temperature, set temperature -13
F2→F3 at ℃. Increase the rotation speed from F5 to F4 at the set temperature of -14℃. In addition, if the room temperature rises further even at the lowest rotation speed F1, the compressor will be stopped at the set temperature of 10t1℃,
When the room temperature has fallen to the set value, the compressor is operated again at the rotation speed of F2. When performing this kind of control, the rotation speed is set so that the compressor does not stop and runs almost continuously at Fl. has been done. In this case, as the room temperature approaches the set value + t1°C, the compression function is lowered to lower the heating capacity, and heating is performed in accordance with the load. However, lowering the compression function lowers the air outlet temperature, which is harmful to the human body. This had the disadvantage that it gave a feeling of cold air and that such operation became stable and continued for a long time.

In addition, some devices detect the temperature of the air outlet and, when the temperature drops, prevent the air from entering the living space and change the direction of the air outlet so that the person does not feel cold. This mainly targets when the compressor is stopped by the thermostat and when the blowing temperature is low at the time of start-up, and when the compressor is in stable operation and the blowing is not carried out into the living space, the indoor temperature distribution As a result, those that can reduce the compression function actually worsen the comfort and worsen the air conditioning efficiency.Purpose of the InventionThe present invention aims to reduce the blowout temperature so that a person feels a feeling of cold air on the body. The purpose of this system is to control the capacity of the compressor in order to prevent this from occurring and to optimize the direction of the air blowing to improve air conditioning efficiency.

Structure of the Invention In order to achieve this object, the present invention uses a variable capacity compressor, has a detection means for detecting room temperature, and a detection means for detecting a blowout temperature, and the blowout temperature is set to a first set value T.
It has a mechanism that changes the direction of the blowing air so that it does not enter the living space when the temperature falls below 1, and when the blowing temperature falls below the first set value T1, the compression function power is increased by at least one step. , the blowout temperature is the second set value T
When the temperature exceeds 2, the compression function is lowered by at least one stage.This keeps the outlet temperature between the first set value T1 and the second set value T2, and reduces the outlet temperature. This prevents air flow, optimizes the direction of the blowing air17, and increases air conditioning efficiency.

-Description of an Embodiment Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 2 to 6 of the accompanying drawings.

In this embodiment, we will take as an example a wall-mounted air conditioner in which the capacity of the compressor is changed by changing the frequency of the power supply supplied to the compressor, and a control diagram is shown in Fig. 2. In Figure 2, 1 is a thermistor that detects room temperature, 2 is an A/D converter, 3 is a thermistor that detects the air outlet temperature, 4 is an A/D converter, 6 is a CPU, 6 is a programmable counter, 7 is an oscillator, 8- is an inverter controller, 9 is an inverter, 1o is a compressor motor, and 11 is a stepping motor.

Next, its operation will be explained.

The room temperature is detected as a resistance value by thermistor 1, and A
/D converter 2 sends the data to CPU 5 as digital data. On the other hand, the blowout temperature is detected as a resistance value by the thermistor 3, and sent to the CPU 5 as digital data by the A/D converter 4. The CPU 5 converts the digital data sent from the A/D converter 2 and the A/D
Digital data sent from converter 4, Figures 2 and 3
The operating frequency δν number is determined by comparison with the frequency allocation shown in the figure, and an address signal of the operating frequency is output to the programmable counter 6. The programmable counter 6 is a CPU
The reference frequency signal output from the oscillator 7 is divided by the address signal output from the oscillator 5.

Sends an operating frequency signal to the inverter controller 8. The inverter controller 8 outputs waveform control signals of 6-9 based on the operating frequency signal from the programmable counter 6. The inverter 9 once converts the AC power human power into DC power, and sends the DC power to the compressor motor 10 as AC power at the operating frequency according to the control signal from the inverter controller 8.
Operate the compressor (not shown).

The stepping motor 11 is still connected to a vane (not shown) that changes the blowing air.

Then, when the blowout temperature detected by the thermistor 3 is below the set temperature, the CPU 6 determines that the CPTJ5 rotates the stepping motor 11 so that the blowout air is blown out horizontally - the blowout temperature is higher than the set value. In this case, the stepping motor 11 is rotated so that the blown air is blown downward.

FIG. 3 shows the allocation of power supply frequency according to room temperature in the embodiment.

In other words, if Ts is the room temperature setting value set by the thermostat, and boundary lines are set at +1℃, +2℃, -1℃, and -2℃, when the room temperature rises, it will initially operate at 76Hz, and when Ts -1℃ is exceeded, it will change to 60Hz. , 45 Hz If it exceeds 78℃
If the temperature exceeds C, Ts-4-1℃, switch to 30Hz. When the temperature rises further and exceeds the Tg of 12°C, the compressor is stopped. When the compressor is stopped and then restarted, it is when the room temperature falls below T8°C and it starts operating at 45H2. , If the room temperature drops during operation at each frequency, 30H
When I was driving at 30Hz until the temperature dropped to 78℃
When it falls below TS'C, it becomes 45H2 and 2.46H2.
When the temperature is lower than Ts-1°C, it is set to 60Hz, and when changing from 60H2 to 45H2, it is set to be set to be lower than Ts-2°C.

Also, the temperature range in the shaded area, that is, the room temperature, is TS℃ and Ts4.
If the temperature is between -2°C, the temperature of the air outlet is controlled.

FIG. 4 shows the allocation of frequency changes and the allocation of the direction of the blown air when performing the blown temperature control I roll.

In other words, when the blowout temperature is between 40°C and 62°C, the operation is performed at the current operating frequency, and when the blowout temperature exceeds 62°C, the 16Hi frequency is lowered.
When the temperature drops below 40℃, increase the frequency to 16Hz.

Further, the blowing air is directed upward when the blowing temperature is 37° C. or lower, and downward when the blowing temperature is 37° C. or higher.

Next, the operation of the control method of this embodiment will be explained with reference to the timing chart of FIG.

It starts at time to, and since the room temperature is less than Ts −1 at that time, 75
Hz operation and room temperature control.

The blowing air temperature must also be below the room temperature of 37°C, and the direction of the blowing air must be horizontal. The blowing temperature gradually rises from around room temperature and exceeds 37° C. at tl.

At this time, the direction of the blowing air changed from horizontal to downward, and the single frequency for sending warm air to the living space remained unchanged at 75Hz, and the room temperature and blowing temperature continued to rise, and the blowing temperature remained stable at over 62℃. Start. And the room temperature is T at t2
exceeds s-1, when the room temperature exceeds Ts-1 at t2,
60Hz operation is started by the room temperature control shown in Figure 31.
When entering 60H2, the blowout temperature decreases to 40℃ and 62℃.
Stable between ℃. The room temperature continues to rise and reaches Tg at t3. At this time, the 45H7 operation is started by the room temperature control shown in FIG. 3, and at the same time, the operation frequency correction control based on the blowout temperature shown in FIG. 4 is started. This starts the blowout temperature control. At this time, the blowout temperature is between 40°C and 52°C, so the 46Hz operation continues.

During the 45 Hz operation, the room temperature further rises by -1-, and when the room temperature exceeds Tr+-4-1 at -j4, the room temperature is controlled according to FIG. 3 and the operation reaches 30 H2. During 30H2 operation, the blowout temperature decreases and when it falls below 40°C in 1'ts, the frequency is changed to 1ts Hz and 45Hz operation by blowout temperature control according to Figure 4. The operation is now 46Hz, and the blowout temperature remains stable above 40°C.

Then, the room temperature gradually rises, and at t6 the room temperature becomes Ts-1-
2, the compressor is stopped by the room temperature control shown in FIG. 3, and the blowout temperature control is also canceled.

When the compressor stops, the blowout temperature drops to 37 at t7.
℃ down. At this time, the direction of the blowing air changes to horizontal.

At t8, the room temperature decreases at Ts-4, so the compressor starts operating again, and at this time, the room temperature is controlled to operate at 45 Hz, and both the room temperature and the blowout temperature begin to rise, and at t9, the blowout temperature exceeds 37°C.

Therefore, the blowing air direction is downward.

Furthermore, since the room temperature exceeds Ts at too, the blowout temperature control is restarted. At this time, the blowout temperature exceeds 40℃, so M45H, which is still operating at 45Hz,
In z operation, the temperature is further increased at near 7, l, t4', the room temperature τB +
1 and becomes 30H2 operation due to room temperature control.

Thereafter, the process from t4 to ta/ is repeated. At this time t7~t
The time between 90Hz and 90Hz is about 3 to 6 minutes, but as shown by the dotted line in Fig. 5, if the conventional blowout temperature control is not performed, the operation will continue at 30Hz, and the blowout temperature will reach 30Hz.
At temperatures below 7°C, the airflow becomes stable with the direction of the air blowing downward.

As explained above, in this embodiment, by controlling the blowout temperature, it is possible to avoid long-term operation with a low blowout temperature and shorten the time to about 3 to 6 minutes during the compressor stop. .

In addition, in this example, we will explain the case where frequency change by an inverter is used to change the capacity of the compressor.
In addition, similar effects can be obtained by controlling the operating speed by switching the number of poles, by changing the cylinder capacity, or by changing the amount of refrigerant circulation by performing bypass. As such, the present invention
It has a variable capacity compressor, a detection means for detecting the room temperature, and a detection means for detecting the air outlet temperature, and detects the air outlet humidity with respect to the operating compression function determined by the room temperature, and determines whether the air outlet temperature is above -Ff. , 1-, when the first set value T1 is exceeded, the compression force is set at least one step, and when the blowout temperature decreases and exceeds the second set value T2, the compression force is corrected to be increased by at least one step. The temperature of the air outlet is controlled to be maintained between the first set value T1 and the second set value T2, thereby preventing the temperature of the air outlet from decreasing, thereby preventing the human body from feeling cold air. In addition, in the case where the blowing direction is changed depending on the blowing temperature, deterioration of air conditioning efficiency due to not blowing into the living space can be prevented.

[Brief explanation of the drawing]

Fig. 1 is an allocation diagram of compressor operating speed according to room temperature showing a conventional example, Fig. 2 is a control block diagram of an embodiment of the present invention, and Fig. 3 is a diagram of compressor operating frequency according to room temperature in this embodiment. The allocation diagram, FIG. 4 is a frequency correction diagram of the blowout temperature in this embodiment, and FIG. 6 is a timing chart of an operation example in this embodiment. 1.3...Temperature sensor, 5...CPU
, 9... Inverter, 10... Compressor motor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (3)

[Claims] (1) Using a variable capacity compressor, it has a detection means for detecting the room temperature and a detection means for detecting the blowout temperature, and during heating operation, the capacity of the compressor is controlled by the room temperature and the blowout temperature, and A heat pump type air conditioner is configured that changes the direction of the blowing air depending on the temperature, and the temperature of the blowing air that changes the direction of the blowing air increases.1. If the value falls below the first set value T1, increase the compression function by at least one step,
A method for controlling the operation of an air conditioner, in which the compression function is lowered by at least one step when the outlet temperature decreases and exceeds a second set value T2. (2) The method for controlling the operation of an air conditioner according to claim 1, wherein the capacity of the compressor is controlled based on the blowout temperature when the room temperature is within a set temperature range. (3) After the air conditioner starts operating, the capacity of the compressor is controlled based on the air outlet temperature after the air outlet temperature exceeds the first set value T1.
or the method for controlling the operation of an air conditioner according to paragraph 2;
.