JPS594612B2 - How to start an air conditioner - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for starting both types of motors in an air conditioner equipped with a compressor motor and a blower motor for indoor air circulation. In conventional air conditioners, in order to prevent the starting current from increasing, a delay timer is used to operate the blower motor for indoor air circulation before the compressor motor. However, if the blower motor is operated first when the indoor temperature is low during heating, the occupants will feel chilly due to the circulation of indoor air. Therefore, it is preferable to operate the compressor electric motor first, and then operate the blower electric motor after the indoor heat exchanger has sufficiently cooled down. On the other hand, when the room temperature is high to a certain extent, the blower motor does not cause discomfort even if it is started immediately, and the heating operation can be quickly started. Although the problem of starting current can be solved by the simple method of starting the blower motor → compressor motor during heating operation, it often causes discomfort to the occupants, and an improvement has been desired. The present invention has been made in view of the above-mentioned facts, and an object of the present invention is to provide a method for starting an air conditioner in which an appropriate starting order of a compressor motor and a blower motor is selected in accordance with the indoor temperature. With the goal. Hereinafter, one embodiment of the present invention will be described based on the drawings.
In the figure, 1 is an indoor temperature sensor installed indoors, 2 is a heat exchanger temperature sensor that detects the temperature of an indoor heat exchanger (not shown), and 3 is a digital signal that converts the analog signal of sensor 1. This is an A-D converter for converting the data into the microcomputer 4, and is connected between the input port 5 and the output port RO of the microcomputer 4. Reference numeral 7 denotes an operation switch circuit consisting of an operation switch 8, a stop switch 9, and a temperature setting switch 10, and is connected between an input port 11 and an output port 12. 13 to 16 are output ports 1 of the microcomputer 4
These are control relays to which an output signal is supplied from 7 through a buffer circuit 18 having an inverting function, and are used to control compressor motor CM, indoor air circulation blower motor FM, four-way valve control relay 19, and auxiliary electric heater H, respectively. Controls energization. The microcomputer 4 alternately reads the indoor temperature and the indoor heat exchanger temperature detected by each sensor 1 and 2 by scanning and compares it with the already stored data, and if different values are input, the new Data is stored. Further, by scanning, an operation signal, a stop signal, and a set temperature signal are input from the operation switch circuit, and these are processed based on a pre-stored program. When the operation switch 8 is pressed while the air conditioner is stopped, the microcomputer 4 performs startup processing based on the program shown in the flowchart of FIG. That is, after passing the judgment part a with YES, the judgment part first compares the room temperature TR with the control temperature TA, which is the set temperature T8 adjusted in advance by the temperature setting switch 10 plus, for example, 0.5°C. ≧TA Pass with YES at 0 o'clock. Then, a command to turn off the four-way valve is issued in the processing section C, and the command is sent from the output port 17 to the control relay 15.

[0] When the signal is sent, the control relay 15 is not excited, and the four-way valve control relay 19 is turned off, making the refrigerant circuit (not shown) into a cooling cycle. At the same time, the control relay 14 is [1] A signal is sent, the control relay 14 is excited, the blower motor FM starts operating, and a 3-second timer is set. This 3-second timer is built in the microcomputer 4, and the unit is It is set to count pulses every time.For this reason, after the blower motor FM starts, the next judgment section f continues to indicate No for 3 seconds, and after 3 seconds, the processing section g returns for 3 seconds. [1] to the control relay 13 so that the timer is reset and the compressor motor CM is started in the processing section.
A signal is sent and the process moves to the next cooling processing section i. In this way, the indoor temperature TR is 0.5°C lower than the set temperature T8.
When the temperature is higher than that, the blower motor FM starts with the four-way valve control relay 19 turned off, and then the compressor motor CM starts operating after 3 seconds have elapsed, so there is no overlapping of starting currents and the processing unit i The compressor electric motor CM is controlled to start and stop so that the temperature TR is maintained near the set temperature T8, and cooling operation is performed. On the other hand, if the judgment section J determines that the operation is No because TR<TA, then the judgment section j compares the room temperature TR with the control temperature TB obtained by subtracting, for example, 0.5°C from the set temperature TR, and determines that TR<TA.
At the time of TBO, it passes with YES, and the [1] signal is supplied to the control relay 15 in the processing section k, the four-way valve control relay 19 is turned on, and the refrigerant circuit enters the heating cycle. Next, the judgment unit 1 compares the indoor temperature TR with the minimum set temperature TSL that can be set by the temperature setting switch 10, and determines Y.
When passing by ES, the blower motor FM starts first, and after 3 seconds, the compressor motor CM
After the processing section m+n+prq and the judgment section 0 operate in the order shown in the figure so that the heating processing section r starts, the process moves to the next heating processing section r. In this way, the indoor temperature TFt is 0.5 lower than the set temperature T8.
If the temperature is lower than °C or higher than the minimum set temperature TSL, the blower motor FM″f: will be started in the same way as when starting during cooling, and after a 3-second delay, the compressor motor CM will be started to reduce the starting current. Avoid overlapping, and quickly perform heating operation to maintain the indoor temperature near the set temperature.In this case, even if you start the blower motor FM immediately, the indoor temperature will still be relatively high, so There is no risk of causing discomfort.On the other hand, if the indoor temperature Tr is lower than the minimum set temperature TSL and the determination unit 1 passes NO, the compressor electric motor CM is started in the processing unit S first. Next, in the cold air discrimination section t, a predetermined temperature T at which the heat exchanger temperature Tc detected by the indoor heat exchanger temperature sensor 2 exceeds the indoor temperature TR is repeated.
When passing through S, the blower motor FM is delayed and started in the processing section U, and the process moves to the heating processing section R. In this way, in a relatively low state where the indoor temperature is less than the minimum set temperature, the compressor motor CM is started first, the indoor heat exchanger is warmed, and the heat exchanger temperature becomes higher than the indoor temperature by a predetermined temperature or more. Since the blower motor FM is started with a delay until the end, not only can overlapping of starting currents be prevented, but also there is no risk of cold air blowing out and causing discomfort to the occupants. In the heating processing section r, the compressor electric motor CM and the auxiliary electric heater H are controlled to start and stop depending on the difference between the room temperature and the set temperature, and an appropriate heating capacity is selected. In addition, when the compressor motor CM or the blower motor FM is started in the processing section qj u, if the auxiliary electric heater H needs to be operated in the heating processing section r, it is recommended to start it with a delay of about 3 seconds. . Furthermore, when the determination unit j is No, the indoor temperature is approximately equal to the set temperature, so only the air blowing operation by the air blower motor FM is performed in the processing unit V. As described above, the present invention provides an air conditioner equipped with a compressor motor and a blower motor for indoor air circulation, in which the starting order of the compressor motor and the blower motor is selected depending on the indoor temperature. For example, when performing heating operation, the blower motor is started first when the indoor temperature is higher than a predetermined temperature, and heating operation is quickly performed while preventing overlap of starting current with the compressor motor. In addition, when the indoor temperature is lower than a predetermined temperature, the compressor motor is started first to eliminate overlap of starting currents, and the start of the blower motor is delayed until there is no risk of cold air blowing out. It is possible to obtain a starting order for both types of motors that is suitable for room temperature.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing one embodiment of the present invention, and FIG. 2 is a flow chart diagram for explaining the present invention. 1...Indoor temperature sensor, 4...Microcomputer, CM...Compressor motor, FM...Blower motor.

Claims (1)

[Claims] 1. In an air conditioner equipped with a compressor motor and a blower motor for indoor air circulation, the starting order of the compressor motor and the blower motor is selected depending on the indoor temperature. A method for starting an air conditioner, characterized by: 2. The starting order described in claim 1 is that when performing heating operation, the blower motor is started first when the indoor temperature is higher than a predetermined temperature, and the compressor is started when the indoor temperature is lower than a predetermined temperature. A method for starting an air conditioner, characterized in that a machine electric motor is selected to be started first.