JPH0362981B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an air blow control method for an air conditioner.

Conventional configuration and its problems Conventionally, indoor blower operation for heating air conditioners was
Generally, the air volume is manually switched according to the user's selection.

The configuration and air volume switching operation will be explained with reference to FIG.

In the figure, a compressor 1, an outdoor heat exchanger 2,
The pressure reducer 3 and the indoor heat exchanger 4 are each connected annularly and in series to constitute a refrigeration cycle.

Generally, the user's selection of air flow rate may not result in the best operation in terms of comfort, uniformity of indoor temperature distribution, and speed of increase in indoor temperature. Therefore, it is necessary to improve comfort by changing the air volume of the indoor fan 6 depending on the blowing temperature.

Indoor blower operation during conventional heating operation is
If the indoor blower 6 is set to the maximum air volume with the operation switch even though the blowout temperature is low due to low capacity or low suction temperature, the low temperature air will hit the user and cause malfunctions. It gives you a feeling of pleasure.

In addition, if the indoor fan 6 is operated at the minimum air volume with the operation switch when the capacity is large and the air temperature is high and the indoor temperature is to rise quickly, the air blow temperature will be higher than the maximum air capacity, but the indoor temperature will rise. The rise will be slow.

In such an indoor blower operation, there are problems in that during the heating operation, the air with a low blowout temperature hits the user and makes the user feel uncomfortable, and that the indoor temperature rises slowly. In the figure, 5 is an outdoor blower, 7 is an indoor unit, and 8 is an indoor unit.
indicates an outdoor unit.

Furthermore, as a conventional example, the fan speed is changed by detecting the blowout temperature by switching two thermostats (Utility Model Opening in 1973-
Publication No. 55547).

However, when actually operating this method, when the fan speed is changed when the refrigerant starts to stagnate or when the room temperature is low, the blowout temperature decreases even more than with the mechanical thermostat's differential. get up. Therefore, repeated operation with a fan speed one step lower than the fan speed occurs.
In addition, the rapid downward trend in room temperature is due to mechanical thermostat differentials, which repeatedly change fan speed in response to slight changes in indoor air temperature, causing damage to the area around the indoor unit, especially the ceiling. There is a problem in that the temperature distribution of the indoor air becomes uneven, causing hot air to accumulate nearby, making your feet feel cold.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks.
The indoor blower is controlled based on the temperature heat exchanged by the heat exchanger, improving indoor comfort, preventing repetitive fan speed operation when the fan speed changes (rapid heating), and making the indoor temperature distribution uniform. (comfortable living space), and to prevent repeated operation of the fan speed after the compressor has stopped (improving the feeling of heating).

Structure of the Invention In order to achieve this object, the present invention determines whether the temperature at which heat exchanged by a heat exchanger is increasing or decreasing, and once the temperature at which heat exchanged by a heat exchanger increases, If it is determined that there is a trend, a change pattern of the fan speed is determined, and once it is determined that the temperature is higher than the first set temperature, the air volume is changed from the minimum air volume to the intermediate air volume,
Further, once it is determined that the temperature is higher than the second set temperature, the air volume is switched from the intermediate air volume to the maximum air volume, and the air volume is gradually changed from the minimum air volume to the intermediate air volume and then to the maximum air volume, and the change in fan speed when determining this upward trend is as follows:
I try not to do anything other than maintain the current fan speed or increase the fan speed. In addition, once the temperature judgment unit determines that the temperature at which heat exchanged by the heat exchanger is in a downward trend, a change pattern of the fan speed is determined so that the temperature at which heat exchanged by the heat exchanger is lowered from the second set temperature. It is determined that the temperature has become lower than the third set temperature, which is set several degrees lower, and the air volume changes from the maximum air volume to the intermediate air volume, and further lower than the fourth set temperature, which is set several degrees lower than the first set temperature. The change in fan speed at the time of determining this downward trend is determined by whether the current fan speed is maintained or the fan speed is decreased. I try not to do anything else.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 5 of the accompanying drawings.

In FIG. 2, reference numeral 9 denotes a temperature extraction section, which is equipped with a thermistor, etc., and extracts the blowout temperature according to the change in indoor temperature from the start of the heating operation, and converts the signal into a voltage. 10 is a temperature storage unit that stores the value of the blowing temperature taken out from the thermistor. 1
Reference numeral 1 denotes a blowout temperature determining section, which determines whether the blowout temperature is rising or decreasing by comparing the blowout temperature with a reference signal. Reference numeral 12 denotes a temperature setting section, which in the microcomputer sets the first set temperature when the blowout temperature rises, as shown in Figure 4.
Ta, the second set temperature Tb is stored, and in the case of a decrease in the blowout temperature, the third setpoint temperature Tc and the fourth setpoint temperature Td are memorized. It is a value. Reference numeral 13 denotes a temperature comparison section, and when the heating operation is started or the temperature of the air outlet increases as the indoor temperature rises, the temperature setting section 1
2, and if it is the same or higher, it is output from the output control section 14, and is controlled by the rotation speed control section 15, for example, from the minimum air volume to an intermediate air volume. If the blowout temperature rises above Ta and is the same or higher than Tb, the indoor rotation speed is controlled from the intermediate air volume to the maximum air volume as described above.

In addition, when the outlet temperature starts to decrease due to a change in the indoor temperature, if the outlet temperature is the same or lower than Tc, the control is performed from the maximum air volume to the intermediate air volume as described above, and if the outlet temperature is lower than Tc. If it decreases and is the same or lower than Td, the indoor rotation speed is controlled from the intermediate air volume to the minimum air volume.

When the control described in FIG. 2 is performed and the air volume of the indoor fan is controlled from the minimum to the maximum as the blowout temperature increases, the indoor temperature rise is improved and the uniformity of the indoor temperature is maintained. In addition, the air volume of the indoor fan is controlled from the maximum to the minimum as the blowout temperature decreases, thereby improving the uniformity of the indoor temperature and providing a comfortable living space.

Next, the outline of the control circuit that performs the above-mentioned operation control will be explained with reference to FIG.

In FIG. 5, 24 is a control circuit equipped with a microcomputer, and a well-known AC-DC exchanger 25 is provided on the input side, and a signal from a thermistor 16 which detects and extracts the temperature of the air outlet is inputted. On the output side of this control circuit 24, the compressor 1,
Maximum air volume terminal 6 of outdoor blower 5 and indoor blower 6
a, relay coils 17, 18, 19, 2 that control energization of the intermediate air volume terminal 6b and the minimum air volume terminal 6c;
0, 21 are provided, maximum air volume terminal 6a, intermediate air volume terminal 6b, minimum air volume terminal 6c relay contact 17
The operation is controlled via a, 18a, 19a, 20a, and 21a. Note that 22 is a power source, and 23 is an operation switch.

Next, the operation of the air conditioner configured as described above will be explained with reference to FIGS. 3 to 5.

After the power switch 23 is turned on, the initial settings are as follows.
The current temperature of the air outlet is shown as shown in Figure 3.
Ts, the air outlet temperature T ₁ , T ₂ when determining whether the air outlet temperature is rising or falling, the count time at that time S = O, the first, second, third temperature for determining the change in each air volume. , the fourth set temperatures are initialized and set as Ta, Tb, Tc, and Td, respectively (step 1).

After performing the above initialization and initial settings, a signal is output from the output port 3 of the microcomputer 24 to operate the compressor 1, and at the same time the microcomputer 2
A signal is output from the output port 4 of the air blower 4, and the outdoor blower 5 is operated to perform heating operation (step 2). Then, a signal is sent from the thermistor 16, which takes out the air outlet temperature during heating operation, to the input port 2 of the microcomputer 24, and the air outlet temperature Ts is stored and set as the air outlet temperature _T1 (step 3). After that, count for a certain period of time (step 4). Then, a signal is sent to the input port 2 of the microcomputer 24 from the thermistor 16, which extracts the temperature of the air outlet.
Store Ts and set the blowout temperature to T ₂ (step 5). Here, in order to judge whether the blowout temperature Ts is rising or falling, the blowout temperature T ₁ and the blowout temperature T ₂ are determined by the microcomputer 24.
Compare (step 6). By ventilating or opening the door, the indoor heating load increases and the air outlet temperature Ts decreases, so the air outlet temperature _T2 becomes lower than the air outlet temperature _T1 , and the air outlet temperature is lowered by the microcomputer 24. It is judged to be medium. Then, the blowout temperature Ts is compared with the third blowout set temperature Tc, and the blowout temperature Ts is
If is higher than the third blowout set temperature Tc,
A signal is output from the output port 5 of the microcomputer 24, and the indoor blower 6 is operated at the maximum air volume, and if the blowout temperature Ts is lower than the third blowout set temperature Tc, the process proceeds to the next step (step 7). Next, the air outlet temperature Ts is compared with the fourth air outlet set temperature Td, which is the lowest, and if the air outlet temperature Ts is higher than the fourth air air set temperature Td, which is the lowest, a signal is output from the output port 6 of the microcomputer 24, and the indoor air blower is activated. 6 is operated at an intermediate air volume, and if the air outlet temperature Ts is lower than the fourth air outlet set temperature Td, which is the lowest, a signal is output from the output port 7 of the microcomputer 24, and the indoor fan 6 is operated at the minimum air volume (step 8). ).

Next, during heating operation, when the indoor load decreases or the room gets warmer, the air outlet temperature Ts rises and the air outlet temperature _T2 becomes higher than the air outlet temperature _T1 , and the microcomputer 24 determines that the air outlet temperature is rising. be judged. Then, the air outlet temperature Ts is compared with the first air outlet set temperature Ta, and if the air outlet temperature Ts is lower than the first air outlet set temperature Ta, a signal is output from the output port 7 of the microcomputer 24, and the indoor fan 6 is operated at the minimum air volume. If the blowout temperature Ts is higher than the first blowout temperature setting Ta, the process proceeds to the next step (step 9). Next, the air outlet temperature Ts is compared with the highest second air outlet set temperature Tb, and if the air outlet temperature Ts is lower than the highest second air outlet set temperature Tb, a signal is output from the output port 6 of the microcomputer 24 and the indoor blower is activated. 6 is operated at an intermediate air volume, and if the air outlet temperature Ts is higher than the second air outlet set temperature Tb, which is the highest, a signal is output from the output port 5 of the microcomputer 24, and the indoor blower 6 is operated at the maximum air volume (step 10). ). In this way, the blowout temperature is
The indoor fan 6 determines whether Ts is rising or falling.
perform the following actions. The details of this microcomputer 24 will be omitted because, as an example, a well-known microcomputer may be programmed to perform the above-described control. In addition, in this example, the outlet temperature is set to the blowout temperature, but since the same effect can be obtained at the temperature of the pipes heat exchanged by the heat exchanger, the outlet temperature is set to the blowout temperature. It can also be temperature.

Effects of the Invention As is clear from the above embodiments, according to the air blowing control method for an air conditioner of the present invention, if the temperature at which heat is exchanged by the heat exchanger is higher than each of the first and second set temperatures, the air volume is increased. If the temperature at which heat is exchanged by the heat exchanger is lower than each of the third and fourth set temperatures, the air volume is reduced. By providing an arbitrary temperature difference between the first set temperature and the fourth set temperature, and further providing an arbitrary temperature difference between the second set temperature and the third set temperature, (1) stagnation of the refrigerant can be achieved. Even if you change the fan speed at startup or when the room temperature is low, the fan speed will not change due to a drop in the blowing temperature, improving the heating capacity and blowing out warm air faster, raising the room temperature. It has excellent quick heating properties.

(2) Even if there is a sudden change in room temperature, the fan speed is maintained within a certain set temperature range to provide a comfortable living space in which the temperature distribution in the room is made uniform.

(3) If the indoor temperature rises and the thermostat turns off and the compressor stops, the fan is operated at a higher speed for a longer period of time, allowing the high-pressure refrigerant to dissipate heat and start the next heating operation immediately. so that the pressure can be balanced.

(4) Temperature is detected by a single temperature sensor, and in order to control the fan speed, a microcomputer is used to set an arbitrary set temperature point and change the speed from low to high speed or from high speed to low. The structure is simple and the fan speed can be easily changed to multiple stages.

[Brief explanation of drawings]

Fig. 1 is a refrigeration cycle diagram of an air conditioner, Fig. 2 is a block circuit diagram implementing the air blowing control method for an air conditioner of the present invention, and Fig. 3 is a flowchart of indoor air blowing control in the air blowing control method. FIG. 4 is an output control operation diagram in the air blow control method, and FIG. 5 is a schematic configuration diagram of a control circuit that implements the air blow control method. 1...Compressor, 2...Outdoor heat exchanger, 3...
Pressure reducer, 5...Outdoor blower, 6...Indoor blower,
9...Temperature extraction section, 10...Temperature storage section, 11...
...Temperature judgment section, 12... Temperature setting section, 13... Temperature comparison section, 14... Output control section, 15... Rotation speed control section.

Claims (1)

[Claims] 1. A refrigeration cycle in which a compressor, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger are connected in a ring, an indoor blower provided corresponding to the indoor heat exchanger, and the rotation speed of the indoor blower. This control device comprises a temperature extraction unit that detects the temperature at which heat is exchanged by the heat exchanger, a temperature storage unit that stores the detected temperature at which heat is exchanged by the heat exchanger, and a temperature storage unit that stores the detected temperature at which heat is exchanged by the heat exchanger. A temperature judgment unit that determines whether the temperature is rising or falling based on a change in the temperature exchanged with the temperature stored in the temperature storage unit and when changing the speed of the indoor blower from the minimum air volume to an intermediate air volume. The first set temperature is set to , the second set temperature is set when changing from the intermediate air volume to the maximum air volume, and the third set temperature is set when changing from the maximum air volume to the intermediate air volume. , a temperature comparison section that respectively compares the temperature with a fourth set temperature that is set when changing speed from the intermediate air volume to the minimum air volume; and a temperature comparison section that generates signals of the maximum air volume, intermediate air volume, and minimum air volume of the indoor blower based on the comparison results of the comparison section. an output control section that outputs an output; and a rotation speed control section that controls the rotation speed of the indoor fan according to the output of the output control section; Determine whether the temperature is decreasing or not, and once it is determined that the temperature after heat exchange by the heat exchanger is increasing, it is determined that the temperature is higher than the first set temperature and the air volume is changed from the minimum air volume to the intermediate air volume; Furthermore, when it is determined that the temperature is higher than the second set temperature and the air volume is switched from the intermediate air volume to the maximum air volume, and when the temperature determination section determines that the temperature that has been heat exchanged by the heat exchanger is on a downward trend, the temperature Once it is determined that the temperature of heat exchanged by the exchanger has become lower than the third set temperature, which is set several degrees lower than the second set temperature, the air volume is changed from the maximum air volume to the intermediate air volume, and further the temperature is changed to the first set temperature. An air blowing control method for an air conditioner in which the air volume is controlled to switch from an intermediate air volume to a minimum air volume upon determining that the temperature has become lower than the fourth set temperature, which is set several degrees lower.