JPS62245043A - Control device for air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to control the operation of an air conditioner most appropriately with a suitable amount of blast to an outdoor heat exchanger obtained by detecting the direction and amount of outside wind through detection of the air temperature of the primary and secondary sides of a heat exchanger to control a motor for an air supply fan. CONSTITUTION:When there is no effect of outside wind, the ratio of the temperature of the secondary side of a heat exchanger to the temperature of its primary side is substantially constant and this relation is beforehand stored in an outside wind detector 14. Then, when a change develops in the outside wind blowing to the outdoor heat exchanger 16, a heat detection circuit 13 detects this change to determine the direction and magnitude of the wind by comparison. Then the speed and the direction of rotation of a motor 2 is controlled by an electric power source circuit 12 and a rotation direction control circuit 15 so that the detected values of the wind become proper. For example, if the outside wind blowing to the outdoor heat exchanger 16 is strong and opposite to the direction of the air supply from the fan, the motor 2 is rotated reversely to secure an air supply amount required for the outdoor heat exchanger 16. Accordingly the operation of an air conditioner can be always controlled most adequately.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention provides a Jilaii system that is always suitable for outdoor heat exchangers.
The present invention relates to a control device for an air conditioner that can obtain t.

[Conventional technology]

FIG. 8 is an electrical circuit diagram showing a control device for this rare conventional air conditioner disclosed in, for example, Japanese Patent Laid-Open No. 57-62348. In the figure, 1 is an AC power supply, 2 is a blower fan motor placed opposite an outdoor heat exchanger (not shown), and has a high speed (Hi) and low speed (Lo) switching tap. There is. A relay 3 controls the motor 2, and its contacts are connected to each tap of the motor 2. 4
is the transistor that drives this relay 3, 5 is the motor 2
This is a driving capacitor for

Next, the operation will be explained. When the air conditioner starts operating, the fan motor 2 of the outdoor heat exchanger is driven together with the compressor motor (not shown), and heat exchange between the outside air and the refrigerant is performed in this heat exchanger. . Here, when a control signal is input to the base of the transistor 4 for the purpose of changing the wind m of the outdoor heat exchanger, the transistor 4 turns on and off according to the control signal, and along with this on and off operation, Relay 3 is turned on (driven) and turned off (released). At this time, if relay 3 is off, its C (common) terminal is b
(Normally closed) It is in a conductive state with the contact, and the motor 2 of the airflow fan is supplied with power from the tap for low-speed operation and rotates at a low speed. Further, when the relay 3 is on, the C terminal is in a conductive state with the a (normally open) contact, and the motor 2 of the ventilation fan rotates at high speed. In this way, the tap of the motor 2 is switched to control its rotational speed (speed), thereby controlling the air volume of the outdoor heat exchanger.

[Problem that the invention seeks to solve]

Conventional air conditioner control devices are configured as shown below, and since the rotation direction of the ventilation fan of the outdoor heat exchanger is set in one direction, the outside air is rotated in the opposite direction to that direction. If air blows onto the outdoor heat exchanger, the required amount of air cannot be obtained even if the blower fan is operated at its rated speed, and the operation of the air conditioner cannot be controlled at all times. The problem was that it couldn't be done.

This invention was made to solve these problems, and allows the outdoor heat exchanger to always have an appropriate air volume.
An object of the present invention is to obtain a control device for an air conditioner that can optimally control the operation of the air conditioner.

(Means for Solving the Problems) The air conditioner control device of the present invention detects the air temperature on the primary side and the secondary side of the outdoor heat exchanger, and detects the direction and amount of outside air. There are provided an outside wind detection means for detecting the outside wind, and a motor control means for controlling the motor of the ventilation fan based on the detection result.

[Effect]

The outside wind detection means compares the temperature difference between the air before and after the outdoor heat exchanger with a set value to detect the direction and magnitude of the outside wind (airflow volume). Then, the motor control means controls the rotational direction and speed of the ventilation fan based on the detection result, and constantly encourages the amount of air blown from the outdoor heat exchanger. That is, even if strong wind blows in the opposite direction to the outdoor heat exchanger, the ventilation fan can be rotated in the opposite direction to obtain an appropriate amount of air.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention.
In the figure, 6 is the overall operation control circuit, 7 is the operation switch, 8 is the motor of the indoor ventilation fan, 9 is the four-way valve coil that switches the refrigerant flow path, 10 is the compressor motor, and 11 is the outdoor ventilation fan. This is a motor control circuit that controls the motor 2.

Figure TS2 is a circuit configuration diagram showing details of the motor control circuit 11. In the figure, reference numeral 12 denotes a power supply circuit that supplies DC drive power to the motor 2, and is connected to coils of the motor 2 that rotate in different directions through contacts a and b of the relay 3, respectively. 13 is a temperature detection circuit that detects the temperature of the air on the primary side and the secondary side before and after the outdoor heat exchanger; 14
15 is a rotation direction control circuit; 15 is an outside wind detection circuit that compares the detected temperatures and detects the direction and amount of outside air blowing on the outdoor heat exchanger; 15 is a rotation direction control circuit;
The transistor 4 is turned on and off in response to a signal from the relay 3, and the contact of the relay 3 is switched to control the rotation direction of the motor 2. Note that the power supply circuit 12 also controls the supply voltage based on the signal from the outside wind detection circuit 14, and controls the rotational speed of the motor 2. Further, one end of the operating capacitor 7 of the solenoid 2 is connected to the a contact of the relay 3 and one coil of the motor 2, and the other end is connected to the b contact of the relay 3 and the other coil of the motor 2, respectively.

Next, the operation will be explained.

When the air conditioner is in cooling operation, when there is no influence of outside wind on the outdoor heat exchanger, the temperature of the air from the primary side to the secondary side of the outdoor heat exchanger will vary from T1 to T1 as shown in Figure 3. Increase by 1 to T2. The temperature T2 on the secondary side relative to the temperature T1 on the secondary side is approximately constant under certain operating conditions, so this is stored in advance in the control circuit (outside wind detection circuit 14). And outdoor heat exchange I! ! ! P! When the outside wind blows on St s, the above value changes, so this is detected by the temperature detection circuit 13 and compared to detect the direction and magnitude of the outside wind. Then, the power supply circuit 12 and the rotation direction control circuit 15 control the rotation speed and rotation direction of the motor 2 so that the values become appropriate values.

FIG. 4 shows how the air temperature changes before and after the outdoor heat exchanger 16 during heating operation, and the air temperature decreases from T3 to T4.

This temperature change is also almost constant when there is no influence of outside wind, so by memorizing the stiffness in advance, the direction and magnitude of outside wind can be detected. It becomes possible to maintain a constant value of 4-.

FIG. 755 and FIG. 6 are flowcharts showing control operations during the above-mentioned cooling operation and heating operation.

In the case of cooling operation, as shown in FIG. 5, when the operation is started, the power supply circuit 12 and the rotation direction control circuit 15 are activated so that the outdoor fan motor 2 has a predetermined rotation speed in the forward direction.
(Step 1ot). Next, the air temperatures T, , T2 on the primary side and secondary side of the outdoor heat exchanger 16 are detected (steps 102 and 103), and the air temperatures T, and T2 are detected.
The temperature difference is compared with a pre-stored set value A (step 104). Here, if T, -T, <A.

This means that the outside wind is blowing in the direction opposite to the direction of the wind blown by the fan, so a reverse rotation command is output to the rotation direction control circuit 15 (step 105). and,
After determining the rotation direction, the temperature difference between T2 and T is newly compared with another set value B stored in advance in step 10.
6) If the temperature difference is large, output a pressure increase command of '1'' to the power supply circuit 12 (step 107).
. If the 2fA degree difference is small, a command to lower the voltage is output (step tOa), and the outdoor air 1 to the heat exchanger 16 is
While controlling so that the crossroads are constant, if the above initial setting values A and H have a width and are set to A±△a or B±△b, carving due to external disturbances such as fluctuations in the outside wind can be prevented. I can do it. A similar effect can also be expected by adjusting the time interval of temperature detection.

Next, in the case of double-cell operation, the outdoor heat exchanger 16 is used as an evaporator, so the air that has passed through the heat exchanger 16 descends as described above. In this case as well, as shown in FIG. 6, the temperature difference between the air on the primary side and the secondary side of the outdoor heat exchanger 16 is compared with a pre-stored set value C in step 109.
), if the difference is small, a reverse rotation command for the motor 2 is output. Then, the temperature difference is compared again with other pre-stored set values (step 110), and if it is large, a command to increase the voltage is output to increase the rotational speed of the motor 2, and if it is small, a command to decrease the voltage is output. to lower the rotation speed.

In this way, the direction and size of the outside air are detected from the temperature difference between the primary side and the secondary side of the outdoor heat exchanger 16 to control the fan motor 2. If the outside air blowing is in the opposite direction to the blowing direction of the fan and has a high wind speed, the motor 2 can be rotated in the opposite direction to ensure the amount of air blowing required for the outdoor heat exchanger 16, and therefore the operation of the air conditioner is can be controlled optimally at all times.

FIG. 7 is a circuit diagram showing another embodiment of the present invention. In this example, a rectifier circuit that rectifies human-powered alternating current from an alternating current power source l! 7 and a smoothing circuit 18, the direct current obtained by these is supplied to the power supply circuit 12, and the drive voltage supplied to the motor 2 is controlled according to the command from the outside wind detection circuit 14. Air blowing direction and air blowing”1. is under control. Even with such a configuration, the same effects as those of the above-mentioned embodiments can be achieved.

〔Effect of the invention〕

As explained above, according to the present invention, the direction and magnitude of the outside air are detected from the difference in air temperature before and after the outdoor heat exchanger, and the rotational direction and rotational speed of the ventilation fan are controlled. As a result, even if strong wind blows in the opposite direction to the outdoor heat exchanger, it is possible to secure the necessary airflow to the heat exchanger, and the operation of the air conditioner can always be properly controlled. This effect can be obtained.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a circuit diagram showing details of the motor control circuit shown in Fig. 1, and Fig. 3 is a circuit diagram showing the front and back of the outdoor heat exchanger during cooling operation. Figure 4 is a diagram showing the temperature change of the air before and after the outdoor heat exchanger during heating operation, and Figure 5 is a flowchart showing the operation of the motor control circuit during cooling operation. , Fig. 6 is a flowchart showing the operation of the motor 1 control circuit for heating operation, Fig. 7 is a circuit configuration diagram showing another embodiment of the present invention, and Fig. 8 shows a conventional air conditioner control device. It is an electrical circuit diagram. 2...Blower fan unit 11--Motor control circuit 12...Power supply circuit 13...Temperature detection circuit 14... Outside wind detection circuit 15 --- One rotation direction control circuit 16 --- Outdoor heat exchanger Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (1)

[Claims] In an air conditioner having an outdoor heat exchanger and a blowing fan disposed opposite to the outdoor heat exchanger, the temperature of the air on the primary side and the secondary side before and after the outdoor heat exchanger is detected. and a motor control means for controlling the rotational direction and rotational speed of the ventilation fan based on the detection result. Features: Air conditioner control device.