KR0159706B1 - Driving control method of airconditioner - Google Patents

Abstract

The present invention relates to a drive control method of an air conditioner, and more particularly, a plurality of evaporators, one compressor, installed between each evaporator and the compressor and having a plurality of valves for controlling the flow of the refrigerant of the valve In the air conditioner for cooling and heating a plurality of rooms by controlling the opening and closing, (A) the process of detecting whether the compressor is driven, (B) if the compressor is driven as a result of the detection of the process (A) whether the initial operation of the compressor Determination process, (c) When the compressor is initially driven as a result of the determination of step (b), the compressor is immediately driven, and the compressor is driven after a predetermined time has elapsed unless the compressor is initially driven. And a step of turning on and off the respective valves for a predetermined time when driving of the compressor is stopped as a result of the detection of step (a). .

Description

Driving control method of air conditioner

1 is a refrigeration cycle diagram of a general air conditioner having a plurality of evaporators.

2 is a control block diagram of an air conditioner according to the present invention.

3 is a detailed circuit diagram of a drive control apparatus for an air conditioner according to the present invention.

4 is a flowchart showing a drive control method of an air conditioner according to the present invention.

* Explanation of symbols for main parts of the drawings

11 condenser 12 main valve

13: main capillary 14: first auxiliary valve

15: second auxiliary valve 16: first capillary

17: second capillary 18: the first evaporator

19: second evaporator 20: room A input unit

21: Room B input unit 22: Room A, B room detection unit

23: first auxiliary valve driving unit 24: second auxiliary valve driving unit

25: main valve drive unit 26: compressor drive unit

The present invention relates to a drive control method of an air conditioner, and more particularly, to a drive control method of an air conditioner having a plurality of evaporators and one compressor.

As is well known, a refrigeration cycle is composed of a compressor, a condenser, a capillary tube, an evaporator, and a refrigerant tube connected in series, and the refrigerant flowing in the refrigerant tube undergoes phase changes such as compression, condensation, depressurization, and evaporation. It absorbs and releases heat from the air to perform cooling or heating. It is generally installed on the outdoor side and includes an outdoor unit having a compressor for compressing the refrigerant at high temperature and high pressure, a condenser for exchanging the high pressure and high pressure refrigerant of the compressor with outdoor air, and evaporating the refrigerant at room temperature passing through the condenser at a low temperature. A capillary tube which is decompressed in an easy-to-reduce state and an indoor unit having an evaporator which takes heat from the high temperature of the room and evaporates the refrigerant decompressed by the capillary tube are divided into a separate type and an integral type air conditioner installed separately.

This configuration is composed of one indoor unit and one outdoor unit, but in recent years, the use of air conditioners has become common, and in homes, large stores, and companies, separate and integrated air conditioners are provided to cool and heat indoor spaces. Each floor or each space was needed. Therefore, according to this trend, an air conditioner, so-called multi-air conditioner, which controls a plurality of indoor units by one outdoor unit, has been proposed, and the cooling cycle of such an air conditioner is shown in FIG.

As shown in FIG. 1, a compressor for compressing a refrigerant at high temperature and high pressure, a condenser 11 for exchanging the high temperature and high pressure refrigerant with outdoor air, and a refrigerant heat exchanged by the condenser 11 are evaporated. A first evaporator 18 and a second evaporator respectively connected to the first capillary tube 16 and the second capillary tube 17, and the first and second capillary tubes 16 and 17, respectively, to reduce the pressure in a prone state. 19 and the first and second capillary tubes (16) and (17), respectively, provided at the front ends of the first and second capillaries (16) and (17) to control the flow of refrigerant into the first and second capillary tubes (16) (17). The main valve 12 and the main capillary 13 connected in parallel with each other to control the flow of the refrigerant from the condenser 11 when the first and second auxiliary valves 14 and 15 and the auxiliary valves 14 and 15 are opened. ).

The operation of the multi-air conditioner according to the above-described configuration will be described below. A case where the first evaporator 18 is installed in the room A and the second evaporator 19 is installed in the room B will be described as an example. First, if only one chamber in room A and room B requires heating / cooling operation, only the auxiliary valve connected to the evaporator of the chamber requiring cooling / heating operation is opened, and both auxiliary valves when both chambers require cooling / heating operation. Will be all open. In addition, when only one auxiliary valve, for example, the first auxiliary valve 14 is opened, the main valve 12 is opened so that the high pressure refrigerant passing through the condenser 11 from the compressor 10 is removed from the main capillary tube 13. After the pressure is reduced by the first capillary tube 16 without passing through the first evaporator 18, the indoor air is cooled. On the other hand, when both the auxiliary valves are open, the main valve 12 is closed, and the refrigerant passing through the condenser is firstly decompressed through the main capillary tube 13, and then flows into each capillary tube and is decompressed secondly. Heat exchange with the air in the room through the evaporator.

In addition, when both chambers do not require heating and cooling operation, both the main valve and the first and second auxiliary valves are turned off and the driving of the compressor is stopped.

However, in the conventional air conditioner, when each chamber does not require air conditioning, the valves are turned off at the same time as the compressor is driven, so that the flow of the refrigerant is stopped abruptly. Pressure imbalances have occurred.

In addition, when the initial driving power is applied to the compressor, the compressor is driven after a delay time of a predetermined time, which is unnecessary during the initial driving of the compressor, which does not satisfy the user's demand for fast cooling and heating effect. It was.

Accordingly, the present invention has been made in view of this point, and its object is to provide pressure imbalance between the high pressure side and the low pressure side of the refrigerant due to sudden shutoff of the refrigerant flow by turning on each valve for a predetermined time when the operation of the compressor is turned off. An object of the present invention is to provide a driving control method of an air conditioner that can be prevented.

On the other hand, another object of the present invention is to provide a drive control method of the air conditioner that is capable of driving the compressor immediately without time delay during the initial drive of the compressor.

Still another object of the present invention is to provide a driving control method of an air conditioner, which is capable of protecting a compressor by providing a time delay for a predetermined time when the compressor is stopped after restarting.

In order to achieve the above object, a driving control method of an air conditioner according to the present invention includes a plurality of evaporators, one compressor, installed between each evaporator and a compressor, and provided with a plurality of valves for controlling the flow of refrigerant. In the air conditioner for cooling and heating a plurality of rooms by controlling the opening and closing of (a) the process of detecting the operation of the compressor, (b) the initial operation of the compressor when the compressor is driven as a result of the detection of the process (a) (C) when the compressor is initially driven as a result of the determination of step (b), immediately driving the compressor, and driving the compressor after a predetermined time has elapsed unless the compressor is initially driven. A) turning on and off the respective valves for a predetermined time when driving of the compressor is stopped as a result of the detection of step (a). The.

Hereinafter, the configuration and the effect according to the preferred embodiment of the present invention will be described in detail.

As shown in FIG. 1, the air conditioner according to the present invention includes a compressor for compressing a refrigerant at high temperature and high pressure, a condenser 11 for exchanging the high temperature and high pressure refrigerant with outdoor air, and the condenser 11. The first evaporator 18 connected to the first capillary tube 16 and the second capillary tube 17, respectively, and the first and second capillary tubes 16 and 17, respectively, to depressurize the refrigerant heat exchanged by the vaporized state. And the second evaporator 10 and the front end of the first and second capillary tubes 16 and 17, respectively, to cool the refrigerant from the condenser 11 to the first and second capillary tubes 16 and 17. First and second auxiliary valves 14 and 15 for intermittent inflow, and main valves 12 connected in parallel to each other to control the outflow of refrigerant from the condenser 11 upon opening of the auxiliary valves 14 and 15. ) And the main capillary tube 13.

In addition, Figure 2 shows a control block diagram of the air conditioner according to the present invention, which is the room A input unit 20 receives the drive signal of the indoor unit provided in the room A from the user, and the drive signal of the indoor unit provided in the room B A and B room sensing to sense a room requiring cooling and heating by the room B input unit 21 and the drive signals from the A and B room input units 20 and 21 to output a predetermined control signal. The control unit 22 and the main valve driver 25 for opening and closing the main valve 12 by receiving a control signal from the A and B chamber sensing units 22 and the control signals of the A and B chamber sensing units 22. Compressor driving section 26 for controlling the drive of the compressor by means of the first, the first auxiliary valve driving unit 23 for opening the first auxiliary valve 14 when the drive signal is input from the chamber A pressure unit 20, and the room B input unit. A second auxiliary valve driver 24 is provided to open the second auxiliary valve 15 when a drive signal is input from 21.

3 is a detailed circuit diagram showing the configuration of an air conditioner according to the present invention. As shown in FIG. 3, in the air conditioner according to the present invention, the chambers A and B detecting unit 22 are composed of two comparators IC1 and IC2, and each of the comparators IC1 and IC2 is A. FIG. When the driving selection signal is input to the real input unit 20 and the B room input unit 21 by the user, a predetermined signal is output. This means that both of the comparators IC1 and IC2 output a low signal when the driving signal is input in both A and B rooms, and the high signal and the comparator in the comparator IC1 when the driving signal is input in only one chamber. At IC2, a low signal is output. In addition, when the driving signals are not input to both the A and B rooms, both comparators IC1 and IC2 output high signals.

On the other hand, the first auxiliary valve driver 23 and the second auxiliary valve driver 24 are turned on when the operation selection signal is input from the chamber A input unit 20 and the chamber B input unit 21, respectively. Transistors Q6 and Q7 which open the first auxiliary valve 14 and the second auxiliary valve 15 by driving the relays RY2 and RY3 are provided.

In addition, the main valve driver 25 includes transistors Q1 and Q4 that receive a base signal from an output terminal of the comparator IC1, transistors Q3 and Q5 that receive a base signal from a collector terminal of the transistor Q1, The inverting signal is input from the collector terminal of the transistor Q3, and the non-inverting terminal is connected to the comparator IC3 connected with the divided resistors R10 and R11, and the collector terminal is connected to the emitter terminal of the transistor Q1. The collector terminal is connected to the emitter terminal of the transistor Q1 of the comparator IC2, and the base terminal has a transistor Q2 connected to the output terminal of the comparator IC2. In the above configuration, a capacitor C5 connected in parallel is connected to the inverting end of the comparator IC3, and an output end thereof is connected to the base end of the transistor Q4 via the diode D1.

On the other hand, the compressor driver 26 includes a transistor Q8 that receives the base signal from the output terminal of the comparator IC2, a transistor Q9 that receives the base signal from the collector terminal of the transistor Q8, and the transistor Q9. Transistor Q10 having an emitter stage connected to a collector stage, a transistor Q12 having an emitter stage connected thereto, and a transistor receiving a base signal from a collector stage of the transistor Q10 to provide a base signal to the transistor Q10. (Q11), a resistor (R6) connecting the collector terminal of the transistor (Q11) and the base terminal of the transistor (Q4), the anode side is connected to the collector terminal of the transistor Q12, the cathode side is a diode connected to the capacitor (C1) (D5), the inverted signal is input from the middle tap of the diode D5 and the capacitor C1, and the divided voltage is input as the non-inverted signal from the voltage divider R8 and R7. The stage is connected to the comparator IC4 connected to the base terminal of the transistor Q12 via the resistor R5 and the relay RY4 connected to the collector terminal by receiving the base signal from the collector terminal of the transistor Q11. Transistor Q13 is provided.

Referring to the driving of the air conditioner according to the present invention having such a configuration as follows. First, in the case where an operation signal is input from at least one of the chambers A and B, for example, in chamber A, first, when the driving signal is input to the chamber A input unit 20, the first auxiliary valve has a base of the transistor Q6. However, since a constant voltage is applied to the relay RY2 connected to the collector side of the transistor Q6, the first auxiliary valve is driven by the relay RY1.

At this time, since the high signal is output from the comparator IC1 of the A and B room sensing units 22 and the low signal is output from the comparator IC2, the transistors Q1 and Q2 are turned off, and the transistors Q3 and Q5. Will be turned on. In addition, since a high signal is input to the base terminal of the transistor Q4, power is applied to the relay RY1 connected to the collector terminal. Therefore, the main valve 12 is driven by the relay RY1. At this time, since the transistors Q1 and Q2 are turned off and the transistor Q3 is turned on, the capacitor C5 connected to the non-inverting side of the comparator IC04 is not charged.

On the other hand, when the operation signal is not input in both A and B rooms, the comparator IC1 (IC2) outputs a high signal. Since the transistor Q4 is turned on, the power is applied to the relay RY1. 12 becomes open.

However, transistors Q1 and Q2 are turned on, and transistor Q3 is turned off so that capacitor C5 is charged with a predetermined voltage from the input voltage. At this time, if the charging voltage of the capacitor C5 is smaller than the divided voltage by the resistors R10 and R11 connected in parallel to the non-inverting terminal of the comparator IC3, the output of the comparator IC3 becomes high and the output of the relay RY1 It does not affect the operation, but when the capacitor C5 continues to charge and the charging voltage becomes larger than the divided voltage on the non-inverting terminal side of the comparator IC3, the output of the comparator IC3 becomes 'low', so the transistor Q4 is turned off. Therefore, since the relay RY1 is turned off, the main valve 12 is stopped from driving.

On the other hand, in the first auxiliary valve driver 23 and the second auxiliary valve driver 24, the transistors Q1 and Q2 are turned on as the high signal is output from the chambers A and B sensing units 22, and the transistor Q5 is turned on. Since the signal is off, the high signal is input to the base terminal of the transistors Q6 and Q7 via the diodes D3 and D4. Accordingly, the first and second auxiliary valves 14 and 15 are driven. However, when the charge voltage of the capacitor C5 connected to the inverting terminal of the comparator IC3 becomes greater than the divided voltage of the non-inverting terminal, the output of the comparator IC3 is changed to 'low', so that the collector voltage of the transistor Q5 is reduced. Is applied to the diode D2. Thus, the transistors Q6 and Q7 are turned off to close the first and second auxiliary valves 14 and 15.

When the driving of the compressor is turned off by the opening / closing control of such a valve, the main valve 12 and the auxiliary valves 14 and 15 can be extended for a predetermined time to maintain the pressure in the cooling cycle.

On the other hand, when an initial power source is applied to the compressor, the drive control of the compressor is first performed by the user when the driving signals of the compressor are input to the room A input unit 20 and the room B input unit 21 from the user. ) Outputs a compressor driving signal to the compressor driver 26. That is, the A and B room detection unit 22 outputs a low signal to one output terminal when it is determined that at least one of the two rooms needs the cooling and heating operation. Thus, the transistor Q8 is turned off, and thus the transistor Q9 is turned on. At this time, when the initial power is applied to the compressor, since the capacitor C1 connected to the inverting terminal of the comparator IC3 has no charged voltage, the comparator IC3 outputs a 'high' signal. Thus, transistor Q12 is turned on, thereby turning on transistors Q10 and Q9.

In addition, as the transistor Q10 is turned on, the transistor Q11 which receives the driving signal from the collector terminal thereof is turned off. Accordingly, since the transistor Q13 is turned on to drive the relay RY4 connected to the collector end thereof, when the initial drive power is applied, the drive power is immediately applied to the compressor without a predetermined time delay.

However, the capacitor C1 is charged by the diode D5 connected to the collector terminal from the time when the transistor Q11 is turned off, and when the charging of the capacitor C1 is completed at a certain point of time, the comparator IC3 is inverted. Since the input voltage of the terminal is greater than the divided voltage of the non-inverting terminal, the comparator outputs a 'low' signal. However, since the potential of the transistor Q11 is already turned off by the resistor R5 and the resistor R6 at the base terminal of the transistor Q12, the relay RY4 is continuously driven to drive the compressor. .

On the other hand, if the compressor is to be driven again within a predetermined time after the compressor is stopped, the 'low' signal is output from the chambers A and B detector 22 so that transistor Q8 is turned on and transistor Q9 is warm. It is a state. At this time, the capacitor C1 connected to the inverting terminal of the comparator IC3 starts discharging from the moment when the driving of the compressor is stopped while the charging is completed, so that the input voltage of the inverting terminal is larger than the divided voltage of the non-inverting terminal of the comparator IC3. Until this time, the comparator IC3 outputs a low signal. Therefore, the transistors Q10 and Q12 are turned off and the transistor Q11 is turned on, so that the drive of the relay RY4 is turned off.

That is, the capacitor C1 is discharged from the time when the driving of the compressor is stopped, and the compressor 10 is not driven until the voltage charged during driving of the compressor is lower than the divided voltage of the non-inverting terminal. Accordingly, since the transistors Q9, Q10, and Q12 are simultaneously turned on to turn off the transistor Q11 from the moment when the output of the comparator IC3 becomes high, the relay RY4 is driven so that the compressor starts operation. .

In the driving control method of the air conditioner according to the present invention having such a circuit configuration, as shown in the flowchart shown in FIG. 4, the room A input unit 20 or the room B input unit 21 is first input from the user in step S10. When a driving signal is input to at least one of the rooms, the indoor air is introduced into the indoor unit by driving the indoor fan in step S11. At this time, the step (s12) compares the room temperature desired by the user with the current room temperature detected by a predetermined temperature sensor, for example, if the desired temperature set by the user is lower than the current room temperature in the case of cooling operation Proceeding to (s13), it is determined whether the compressor is initially driven. At this time, if the compressor is initially driven, the process proceeds to step s15 to immediately drive the compressor.However, if the compressor is to be restarted after stopping operation, the process proceeds to step s14. By driving, it is possible to prevent the shortening of the compressor life due to the continuous drive of the compressor. This is controlled by the charge and discharge time of the capacitor of the compressor drive unit as described above.

On the other hand, when the indoor air is cooled by the operation of the compressor in step (s16), it is determined whether to stop the operation of the compressor by comparing the desired temperature with the temperature of the indoor air cooled by heat exchange with the evaporator in step (s16). As a result of the comparison, if the current room temperature is less than the desired temperature, the process proceeds to step s17 to stop the operation of the compressor. At this time, in the step (s18) and step (s19) to open the main valve 12 and the auxiliary valve 14, 15 for a predetermined time, which is the filling of the capacitor (C5) of the main valve driving unit 25 as described in detail above It is due to discharge.

Therefore, when a predetermined time has elapsed in step S20, in step S21 and step S22, the main valve and the auxiliary valve are turned off to end the heating and cooling operation.

As described above, by operating the compressor of the air conditioner according to the present invention, it is possible to increase the cooling and heating efficiency by immediately operating the compressor without a delay time when the initial power is applied to the compressor, and to prevent the pressure imbalance generated when the compressor is stopped. It can work.

Claims (1)

In the air conditioner which is provided between a plurality of evaporators, one compressor, each of the evaporator and the compressor, and having a plurality of valves for controlling the flow of the refrigerant to control the opening and closing of the valves to heat and cool the plurality of rooms, A) detecting whether the compressor is driven, (b) determining whether the compressor is initially driven when the compressor is driven as a result of the detection of step (a), and (c) the compressor is initially initialized as a result of the determination of step (b). In case of being driven, immediately driving the compressor and driving the compressor after a predetermined time has elapsed unless the compressor is initially driven. (D) If the compressor is stopped as a result of the detection of step (a), the valve And a step of turning on and off for a predetermined time.