JPS5952145A - Operation control of air conditioner - Google Patents

Abstract

PURPOSE:To improve the air conditioning efficiency by a method wherein the capacity of a compressor is changed by comparing a detected blow-off temperature with the set value. CONSTITUTION:The room temperature is detected by a thermistor 1 in by terms of resistances and sent to a central processing unit (CPU) 5 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 interms of resistances and sent to CPU5 by being converted into digital data by A/D converter 4. A programmable counter 6 demultiplys the reference frequency signal issued from an oscillator 7 by an address signal sent from CPU5 so as to issue an operating frequency signal to an inverter controller 8 in order to send to a compressor motor 10 to drive a compressor. Let Ts be the set value of room temperature set by a thermostat. When the rise of room temperature is requested, the compressor is at first put into a drive on 75Hz. When the room temperature exceeds the lower limit value Ts-1 deg.C, the compressor is changed-over to the drive on 60Hz. When exceeds Ts deg.C, to the drive on 45Hz, when exceeds Ts+1 deg.C, to the drive on 30Hz. When the room temperature exceeds the upper limit value Ts+2 deg.C, the compressor is brought to a standstill. The compressor is restarted from its standstill by resetting only when the room temperature is below Ts deg.C and yet the drive is started on 45Hz.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 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 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 set value and the room temperature,
Capacity was changed depending on room temperature.

In other words, in a compressor whose capacity is changed by changing the rotational speed of the compressor, it is first operated at high rotational speed F4, and when the room temperature rises and reaches the set value -tsd, the rotational speed of the compressor is changed to 4mrD3.
When the room temperature reaches the set value, operate at a lower rotation speed F2, and further increase the room temperature to the set value + t2σ. If the room temperature drops slightly while the room temperature is rising, the rotation speed is increased one step at a time at a temperature one step lower than the temperature at which the rotation speed changes when the room temperature rises.

In other words, Fl-+F2 at the set temperature, set temperature -t36
At F2→F5, set temperature -t4d, F3→F4, and the rotation speed increases by L.

Also, if the room temperature rises even at the lowest rotation speed of 21,
Stop the compressor at the set temperature +1+(?). When the room temperature reaches the set value, the compressor is operated again at the rotation speed of F2.

When such control is performed, the compressor does not stop and the Fl
The rotation speed is set so that almost continuous operation occurs. In this case, as the room temperature approaches the set value + t + (5), the compression function power is reduced and the heating capacity is reduced to perform heating that matches the load, but when the compression function power is changed, the outlet temperature increases. Since the F is low, it gives a feeling of cold air to the human body and has the drawback that such operation becomes stable and continues for a long time.

In addition, some devices detect the temperature of the air outlet and, when the temperature of the air outlet is low, prevent the air from entering the living space and change the direction of the air outlet so that the user does not feel the cold air. In this case, the main target is when the compressor is stopped by the thermostat and when the air temperature is low when the compressor is in a standing position.If air is not blown into the living space while the compressor is operating stably, Since the indoor temperature distribution deteriorates, those that can reduce the compression function to a low F have instead worsened comfort and air conditioning efficiency.

Purpose of the Invention The present invention has the following objects: 1-1. I'm here.

Structure of the Invention To achieve this object, the present invention has a capacity ++J Atsushi type compressor, a detection means for detecting the room temperature, and a detection means for detecting the blowout temperature, and the blowout temperature is set to a first set value. It has a mechanism that changes the direction of the blowing air so that it does not enter the living space when turning to T1 and F, and sets the blowing temperature to the twelfth set value T+ (second set value T2<
A third set value T5 is set, and the air outlet temperature is periodically detected. When the air outlet temperature is lower than the second set value T2, the compression function is decreased or raised by one step, and the air outlet temperature is increased. When it rises to 7 and exceeds the third set value T5,
Controlling the compression function to reduce it by at least one step,
Prevents low blowout temperature and optimizes blowout air direction.
This increases air conditioning efficiency.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will now be described with reference to FIGS. 2 to 6 of the accompanying drawings.

In this embodiment, a wall-mounted air conditioner is used as an example in which the capacity of the compressor is changed by changing the frequency of the power supply supplied to the compressor, and FIG. 2 shows a control program diagram thereof.

In Figure 2, 1 is the thermistor that detects the room temperature, 2 is the A/D converter, 3 is the F-mister that detects the air temperature, 4 is the '/'L) converter, 6 is the CPU, and 6 is the programmable Counter, 7 is an oscillator, 8 is an inverter controller,
9 is an inverter, 10 is a compressor motor, and 11 is a stepping motor.

Next, its operation will be explained.

In the same case, the resistance value is low at room temperature due to thermistor 1,
is detected by the A/D converter 2 and sent to cptrcs as digital data.

On the other hand, the temperature of the air outlet is detected as a resistance value by the thermistor 3, and sent to the CPU 6 as digital data by the A/D converter 4. The CPU 5 performs M/D conversion on the digital data sent from 2 and the A/IJ conversion track 4.
The digital data sent from the controller is compared with the frequency allocation shown in FIGS. 2 and 3, the operating frequency is determined, and the operating frequency is output to the programmable counter 6. The programmable counter 6 divides the reference frequency signal output from the oscillator 7 according to the address signal output by the CPU, and outputs an operating frequency signal from the inverter controller 8-\. The inverter controller 8 controls the inverter 9 based on the operating frequency signal from the programmable counter 6.
outputs a waveform control signal. The inverter 9 once converts the AC source input into DC, and uses the control signal from the inverter controller 8 to convert the DC power source into an AC power source at the operating frequency.
to the compressor motor 1° to operate the compressor (not shown).

Further, the stepping motor 11 is connected to a vane (not shown) that changes the blowout air, and when the blowout temperature detected by the thermistor 3 is equal to or higher than the set temperature,
Based on the judgment of the CPUF 5, the stepping motor 11 is rotated so that the blown air is blown out horizontally, and if the blown air temperature is higher than the set value, the stepping motor 11 is rotated so that the blown air [2] is blown out in the right direction. .

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

That is, let T be the room temperature setting value by the thermostat,
Set a boundary line at +1°G, +2°C2-1°C1-2°C.When the room temperature rises, first operate at 75H2, then Ts-
If it exceeds 1°G, it becomes 60 H2, and if it exceeds 18°C, it becomes 46.
If H2 exceeds TB4-1°C, it becomes 30H2.

Switch.

When the temperature increases by 71°C and exceeds 1812°C, the compressor is stopped. 11 (When the compressor returns to normal condition, the room temperature is T8°C'f: 45 H7
Start driving.

If the room temperature drops by F while operating at each frequency, when operating at 30H2, keep it at 30H2 until it drops to 18℃,
If you set Tsoo to 45H2 when you set it to 46H2, and the temperature drops to -C, when you turn TB-1°C, set it to 60Yen, and when you change from 60H2 to 46H2, set T.
It is set as s-2"°C when the temperature is turned over.

In addition, the temperature range in the shaded area is 8.
If the temperature is between 6C and Ts 1,22°G, the temperature of the air outlet is controlled.

FIG. 4 shows the allocation of frequency changes and the allocation of airflow when controlling the airflow temperature.

In the same figure, when the blowout temperature is between 40°G and 62''C, the current operating frequency remains the same.
d15H215H when the blowout temperature exceeds 62°C
Give me two.

Further, when the temperature of the blown air is 37°G or higher, the air blows in the u', -1=direction, and when the temperature is 37°G or higher, it moves in the opposite direction.

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

In the figure, starting at time 10, the room temperature Id)
'J:, -* Since it is 76 H2 operation 17, room temperature control is performed with frequency allocation only for room temperature as shown in the figure below.

And the temperature of the air outlet is also room/l! Since the temperature is 37°C or higher, the blowing air direction is horizontal.

The blowout temperature gradually rises from around room temperature to 3 at tl.
Over 70. At this time, set the blowout air direction to F,
Sends warm air into the living space. The frequency remains at 76H2, and the room temperature rises. Then, at time t2, the room temperature becomes Ts-1
reached, changed to 60H2 operation, and the blowout temperature was 'F.
The precipitation has stabilized, but the temperature is still above 43°G.

Furthermore, the room temperature reaches J-, and the room temperature reaches Ts at a rising time t3. At this time, 45H2 operation is started by controlling the room temperature as shown in FIG. At this time, the blowout temperature control is started at the same time. t3
The blowout temperature is detected at time t4 when Δt has elapsed. At this time, it is assumed that the air outlet temperature is 14,300 or higher, and the operating frequency is set to 157 (7:
Doge3oH2 driving luck.

Next, after △ has passed from t4, a speech bubble -t! at t5! Detect IA degree. At this time, blowout 1 fiA degree 1: J' 40°
It is between 43°C and 43°C, and continues to operate at 30H2. Furthermore, after △ has passed from t5, a speech bubble 1 appears at t6.
Detect the degree of fragility. At this time, the blowing temperature (1-, f
The operating frequency is reduced to 1 by controlling the FC blowing temperature above 40'C.
6H) 51-years-long operation resulting in 46H2 operation.

Next, when the room temperature exceeds TB + 1 at tl, the operating frequency becomes 30 H2 due to room temperature control.

Next, at t8 after passing △ from t6, the air outlet temperature is detected, and if the air outlet temperature is 40"C or higher, the air outlet temperature is controlled to set the operating frequency to 45
Set to H2 operation.

Roughly detect the tvK blowout temperature after △ from t8.1 If the blowout temperature is between 40'C and 43°C,
The operating frequency remains the same and continues to operate at 46Hz.

Next, the air outlet temperature is detected at tlo after Δ has elapsed from t9, and if the air outlet temperature exceeds t by 43°C, the operating frequency is increased to 15H2 and the operation is set to 30H2.

Further, the blowout temperature is detected at 1++ after Δ has elapsed from tlG, and if the blowout temperature is 40° C. or more, the operating frequency is increased by 16H2 to set 45 HE operation.

Next, since tj<, the blowout temperature is detected at tj2 after Δ has elapsed. At this time, as with tlo, the temperature of the air outlet is 4.
Since the temperature is over 3°C, the frequency increases by 15Hz'F to 30
It becomes nz operation.

Next, after Δ has elapsed from t12, the air outlet temperature is detected at t'11, and at this time, the air outlet temperature is 4 o
If the voltage is t3 or higher, the frequency is increased by 16H2 to provide 46H2 operation.

After that, the control from t11 to t12 is repeated, and the blowout temperature becomes stable around 40' to 43°C, and the blowout temperature becomes 37°C or lower, which is the case when the blowout temperature control is not performed, as shown by the dotted line in Fig. 6. Low F is avoided, and the blowing air is also prevented from being oriented horizontally.

In addition, in this example, a case was explained in which frequency change using an inverter was used to vary the capacity of the compressor.
In addition, there are some IN! that control the operating speed by switching the number of poles, or that change the cylinder volume and number of cylinders. /: 1. The same effect can be obtained even if the refrigerant circulation rate is changed by bypassing.Although the outlet temperature was detected at a constant cycle of Δ, the effect is even greater when the time interval is changed when the capacity is lowered or lowered. It is clear that the effect is bitter.

Effects of the Invention As is clear from the above embodiments, the present invention has a variable capacity compressor, a detection means for detecting room temperature, and a detection means for detecting outlet temperature, and the outlet temperature is set to the 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 exceeds 1 or 5, and the blowing temperature is set to a first set value T, < a second set value T2. is provided, the air outlet temperature is periodically detected, and when the air outlet temperature is below the first set value T1, rJ, the compression function is reduced by at least one step, and the air outlet temperature is set to the second set value T2.
When the temperature is above zero, the compression function is controlled to be reduced by one step, and correction is made to keep the blowout temperature close to the first set value T1 and the second set value T2. , it is possible to prevent continuous operation with a low blowout temperature, avoid giving a feeling of cold air, and perform comfortable heating, and change the blowout direction depending on the blowout temperature. Deterioration of air conditioning efficiency due to not blowing air 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 two embodiments 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, 6...(3
PU, 9... Inverter, 10... Compressor motor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure ← Figure 2 Figure 3 Figure 5 □ Fog 1 jrt k' ↓ tn.

Claims (3)

[Claims] (1) It has a variable capacity compressor, a detection means for detecting the room temperature, and a detection means for detecting the outlet temperature, and during heating operation, the capacity of the compressor is controlled based on the room temperature and the outlet temperature, and the outlet temperature is controlled by the compressor. The heat pump type air conditioner changes the direction of the blowing air by periodically detecting the blowing temperature, and when the blowing temperature is higher than the first set value T1, the compression function power is increased by at least one step. An operation control method for an air conditioner, in which the compression function is lowered by at least one step when the outlet temperature reaches a second set value T2 or higher. (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 second set value T2.
The method for controlling the operation of an air conditioner according to item 1 or 2.