JPH0449020B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an operation control device that controls 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 room temperature is detected as a condition for changing the capacity, and the room temperature is set as shown in Figure 1. Capacity levels were set based on the difference between the value and room temperature, and capacity was controlled based on room temperature.

In other words, in a compressor whose capacity is varied by changing the rotational speed of the compressor, it is initially operated at a high rotational speed _F4 , and when the room temperature rises and reaches the set value _-t3 ℃, the first stage rotational speed is changed to a lower _F3. When the room temperature rises further and reaches the set value, it operates at one step lower rotation speed F ₂ , and when the room temperature rises further and reaches the set value + t ₂ °C, it operates at the lowest rotation speed F ₁ . .

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. That is, at the set temperature F ₁ →
F ₂ , set temperature - t ₃ °C F ₂ →F ₃ , set temperature - t ₄ °C
Increase the rotation speed from F ₃ to F ₄ . Furthermore, if the room temperature rises further even at the minimum rotation speed F ₁ , the compressor is stopped at the set temperature + t ₁ °C, and when the room temperature falls to the set value, the compressor is operated again at the rotation speed F ₂ .

When this kind of control is performed, the compressor does not stop.
The rotation speed is set so that it operates almost continuously at _F2 .

In this case, as the room temperature approaches the set value + t ₁ °C, the compressor function is lowered to lower the heating capacity, and heating is performed in accordance with the load. It has the disadvantage that it gives a feeling of cold air to the human body and such operation becomes stable and continues for a long time.

There are also devices that detect the temperature of the air outlet and, when the temperature drops, change the direction of the air outlet to prevent the air from entering the living space and to prevent the feeling of cold air. ,
It is mainly targeted at times when the compressor is stopped by the thermostat and when the blowout temperature is low at startup.If the blowout is not carried out into the living space while the compressor is operating stably, the indoor temperature distribution will deteriorate. Those that can reduce the compression function actually worsen comfort and air conditioning efficiency.

Purpose of the Invention The present invention aims to eliminate the above-mentioned drawbacks of the conventional technology, and improves the capacity of the indoor blower in order to prevent the feeling of cold air to the human body due to a decrease in the blowout temperature, and to optimize the airflow volume and increase air conditioning efficiency. The purpose is to control.

Structure of the Invention In order to achieve this object, the present invention provides a variable capacity compressor, room temperature detection means, room temperature setting storage means, room temperature comparison means for comparing the room temperature setting temperature and room temperature, compressor operating frequency storage means, and A compressor operating frequency determining means, a compressor operating frequency controlling means, a compressor output means, an indoor fan motor, a blowing temperature detecting means, a blowing temperature setting storing means, and a blowing temperature comparing means for comparing the blowing setting temperature and the blowing temperature. A heat pump type air conditioner for controlling indoor fan motor capacity is configured by providing an indoor fan motor rotation speed storage means, an indoor fan motor rotation speed determination means, an indoor fan motor rotation speed control means, and an indoor fan motor output means, and When the blowout temperature becomes lower than the first blowout setting temperature stored in the blowout setting temperature storage means, the indoor fan motor capacity is lowered by at least one step to lower the blowout temperature to a second blowout setting temperature higher than the first blowout setting temperature. exceeds the capacity of the indoor fan motor by at least 1
A step-up determining means and a control means for controlling the fan motor capacity based on the determination result from the determining means are provided, and the blowout temperature is increased from the time when the fan motor starts operating with a gentle breeze until the blowout temperature exceeds the second blowout set temperature. The indoor fan motor capacity is controlled based only on the temperature.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.
This will be explained with reference to FIG. Here, in this example,
A case will be described in which the capacity of the compressor is changed by changing the frequency of the power supply supplied to the compressor, and the air blowing capacity of the indoor fan motor is also changed at the same time.

First, the compressor control circuit will be explained with reference to FIG.

In the figure, 1 is a thermistor that detects room temperature, 2 is an A/D converter, 3 is a CPU, 4 is a programmable counter, 5 is an oscillator, 6 is an inverter controller, 7 is an inverter, and 8 is a compressor motor. .

Next, its operation will be explained.

Room temperature is detected as a resistance value by thermistor 1, and is converted into digital data by A/D converter 2.
Sent to CPU3. The CPU 3 compares the digital data with the frequency allocation shown in FIG. 5 to determine the operating frequency, and the programmable counter 4
The address signal of the operating frequency is output to. The programmable counter 4 divides the reference frequency signal output from the oscillator 5 according to the address signal output by the CPU 3 and outputs an operating frequency signal to the inverter controller 6. The inverter controller 6 outputs a waveform control signal for the inverter 7 based on the operating frequency signal from the programmable counter 4. Inverter 7
converts the AC power input into DC once, and in response to a control signal from the inverter controller 6, the DC power is used as AC power at the operating frequency and is sent to the compressor motor 8 to operate the compressor (not shown).

Next, the control circuit for the indoor fan motor will be explained with reference to FIG.

In the figure, 9 is a thermistor that detects the temperature of the air outlet, 10 is an A/D converter, 11 is a relay,
12 indicates a fan motor.

Next, its operation will be explained.

The blowout temperature is detected as a resistance value by the thermistor 9, and sent to the CPU 3 as digital data by the A/D converter 10. The CPU 3 compares the digital data with the fan motor capacity allocation shown in FIG. 6, determines the operating capacity, and issues a signal to close the designated relay 11. The fan motor 12 operates at a specified rotation speed by closing an electric circuit with the relay 11.

Figure 5 shows the distribution of power supply frequency according to room temperature.

In the same figure, T _S is the room temperature setting value set by the thermostat, -0.5℃, +0.5℃, +1℃, +1.5℃,
Set boundaries at +2°C, +3°C, and +4°C,
When the room temperature rises, it is first operated at 100Hz, and T _S -0.5℃.
If it exceeds T _S ℃, switch to 90Hz, and if it exceeds T S ℃, switch to 80Hz. The temperature further increases and T _S +4
If the temperature exceeds ℃, stop the compressor.

When the compressor stops and then returns, the room temperature is T _S +
When the temperature drops below 1.5℃, operation starts at 60Hz.
Also, if the room temperature drops during operation at each frequency, and if it crosses the same temperature boundary line as when it rises, it will operate at a frequency one step higher.

Also, the temperature range in the shaded area, that is, the room temperature is T _S
Blowout temperature is controlled until the temperature exceeds +3°C and compressor operation resumes.

FIG. 6 shows the allocation of changes in the fan motor rotation speed when controlling the blowout temperature. Here, when the temperature reaches or falls below 37°C, the indoor fan operates in a light breeze mode. In this example, "light wind operation" refers to operation at a rotation speed of 900 rpm or less, and when the blowout temperature is up to 37 degrees Celsius, the rotation speed is 900 rpm.
Operated with a gentle breeze at a rotation speed of 37°C.
When the temperature drops below 37°C, the rotation speed is set to 700rpm to operate in a breeze, and once it drops below 37°C, it rises again.
When the temperature exceeds 41℃, change the rotation speed to the original rotation speed.
It is set to return to 900rpm.

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

In the figure, the operation starts at time _t0 , and since the room temperature is below T _S -0.5°C, the room temperature is controlled by operating at 100 Hz with the frequency allocation shown in FIG. Time _t1 The room temperature reaches T _S -0.5°C and the operation switches to 90Hz.

The room temperature further increases and reaches T _S at time t ₂ , reaching 80Hz.
The operation begins, and the room temperature at t ₃ , t ₄ , t ₅ , and t ₆ becomes T _S +0.5, T _S +1, T _S +1.5, and T _S +, respectively.
2, the frequencies are 70Hz, 60Hz, respectively.
Run at 50Hz, 40Hz. At this time, the indoor fan motor is operating at 1100 rpm. And time t ₇
At time t7, the room temperature reached T _S +3°C, so the indoor fan went into a light-breeze mode, and as a result, at time _t7 , the room temperature reached T _S +3°C, and the compression operating frequency increased.
When the frequency reaches 30Hz, the indoor fan motor starts operating at 900 rpm, and at the same time, the air outlet temperature control starts and the air outlet temperature sensor starts detecting the air outlet temperature.

In this case, since it is in the 30Hz operating range, the blowout temperature begins to drop, and when the blowout temperature falls below 37℃ at time _t8 , the fan motor speed is increased to 700rpm by controlling the fan motor capacity according to the blowout temperature as shown in Figure 6.
Start driving.

Next, since heat is exchanged by the same heat source (heat exchanger, not shown), the rotation speed of the indoor fan motor decreases, and the amount of air passing through the heat source per unit time decreases, so the heat exchanger of the air passing through the heat source decreases. The time required for heat exchange with the vehicle increases, and the temperature of the air passing through it increases. Therefore, after the rotational speed of the indoor fan motor decreases, the blowout temperature gradually increases until it reaches time _t9 .
When the temperature reaches 41℃, the fan motor rotation speed returns to the original rotation speed of 900 rpm. The room temperature continues to rise gradually,
When the room temperature reaches T _S +4° C. at time t ₁₀ , the compressor is stopped by the room temperature control shown in FIG.

After the compressor is stopped, the blowout temperature is continued to be controlled, and when the blowout temperature falls below 37°C at time _t11 , the fan motor operates at 700 rpm. When the room temperature drops to T _S +1.5°C at time t ₁₂ , the compressor resumes operation, and the blowout temperature is controlled for one minute after the compressor is restarted. In other words, since the blowout temperature is below 37℃, the fan motor continues to operate at 700rpm.
After 1 minute, at time t ₁₄ , the blowout temperature control is canceled.
The fan motor returns to 1100 rpm.

Here, if conventional blowout temperature control is not performed, after time _t8 in FIG. 7, as shown by the dotted line, the blowout temperature remains stable for a long time at around 37°C.

FIG. 8 shows a flowchart of this embodiment.

First, the suction temperature at room temperature is detected and read as _t1 . _t1 is compared with each room temperature set value, and if the conditions are met, the frequency in that temperature range is determined. Here, if t ₁ is higher than T _S +4°C, 0 is assigned to the COM flag, and if t ₁ is lower than T _S +1.5°C, 1 is assigned to the COM flag. The compressor operates when the COM flag is 1, and stops when the COM flag is 0. If t ₁ is T _S +1.5℃ or higher, T _S +4℃
When the value is below , the compressor is operated or stopped based on the previous COM flag value.

Next, when the compressor is stopped or when the compressor is running at a minimum frequency of 30Hz, t ₁ becomes T _S
When the temperature is above +3°C and below T _S +4°C, or within 1 minute after the start of operation, the indoor fan motor operates at 900 rpm and begins to detect the blowout temperature.

Even when the compressor is operating, if _t1 is outside the above range, the fan motor is not controlled, returns to the starting point, and starts detecting the room temperature suction temperature again. After detecting the blowout temperature, set this to t ₂
When t ₂ is below 37°C, 0 is assigned to the Fan flag, and when t ₂ is above 41°C, Fan flag is set to 0.
Assign 1 to the flag, and when the Fan flag is 0 or 1, the fan motor will run at 700 rpm or 700 rpm, respectively.
Operated at 900rpm. When t ₂ is outside the above range, the fan motor will run at 700 rpm or 900 rpm depending on the previous contents of the Fan flag.

Therefore, in this embodiment, by controlling the air outlet temperature, it is possible to avoid operating for a long time in a state where the air outlet temperature is low.

In this example, we have described a method that uses frequency change by an inverter to vary the capacity of the compressor, but there are other methods such as changing the operating speed by switching the number of poles, changing the cylinder volume, or changing the refrigerant by bypassing the compressor. A similar effect can be obtained by changing the amount of circulation. Further, as for the indoor fan motor, a similar effect can be obtained even if a transistor motor is used.

Effects of the Invention As is clear from the above embodiments, the present invention provides a heat pump type air conditioner using a variable capacity compressor, which includes a detection means for detecting the room temperature and a detection means for detecting the temperature of the air outlet. When the temperature drops and falls below the first set value _T1 , the fan motor rotation speed is lowered by at least one step, and after the temperature drops below _T1 , it rises and exceeds the second set value _T2. When the fan motor rotation speed is corrected to return to its original state, the air outlet temperature is controlled to be maintained between the first set value _T1 and the second set value _T2 , and the air outlet temperature decreases. This prevents the cold air from giving the human body a feeling of cold air, and also prevents the blowout temperature from rising too high, which prevents the hot air from reaching the floor and causing poor feeling. It can be prevented. Moreover, since the fan rotation speed is controlled after the room temperature exceeds the set temperature, the user does not feel that the heating capacity is insufficient.

[Brief explanation of the drawing]

Fig. 1 is an allocation diagram of the number of compressor operation times of a conventional air conditioner operation control device, Fig. 2 is a block diagram expressing the air conditioner operation control device of the present invention by means of function realization means, and Fig. 3 and FIG. 4 are block circuit diagrams of a compressor and an indoor fan motor in an air conditioner operation control device showing one embodiment of the present invention, and FIG. 5 is a diagram of the allocation of compressor operating frequency according to room temperature in the same embodiment. , FIG. 6 is a fan motor rotation speed correction diagram of the blowout temperature in the same example,
FIG. 7 is a timing chart of an operation example in the same embodiment, and FIGS. 8a and 8b are flow charts in the same embodiment. 1, 9...thermistor, 3...CPU, 7...
...Inverter, 8...Compressor motor, 12...Indoor fan motor.

Claims (1)

[Claims] 1. Variable capacity compressor, room temperature detection means, indoor temperature setting storage means, room temperature comparison means for comparing room temperature setting and room temperature, compressor operating frequency storage means, compressor operating frequency determination means, compressor operating frequency control means and a compressor output means, an indoor fan motor, a blowout temperature detection means, a blowout temperature setting storage means, a blowout temperature comparison means for comparing the blowout setting temperature and the blowout temperature, an indoor fan motor rotational speed storage means, and an indoor fan motor rotational speed. A heat pump air conditioner that controls indoor fan motor capacity is configured by providing a determination means, an indoor fan motor rotation speed control means, and an indoor fan motor output means,
When the blowout temperature falls below the first blowout temperature setting stored in the blowout temperature setting storage means, the indoor fan motor capacity is lowered by at least one step, and the blowing temperature is lowered to a second blowout temperature setting higher than the first blowout temperature setting temperature. A determining means for raising the capacity of the indoor fan motor by at least one level when the temperature exceeds the temperature, and a control means for controlling the fan motor capacity based on the determination result of the determining means are provided, and from the time the fan motor starts operating with a gentle breeze, the air blowing An operation control device for an air conditioner that controls indoor fan motor capacity only based on the blowout temperature until the temperature exceeds a second blowout set temperature.