KR100685754B1 - Air-conditioner System for having two compressor and method for controlling the same air-conditioner - Google Patents

Abstract

The present invention relates to an air conditioner for operating two compressors simultaneously, alternating operation and single operation according to the cooling load of the room. To this end, a temperature sensor for detecting an indoor temperature in an air conditioner having two compressors having different compression capacities; An input unit for detecting desired temperature information of an indoor room from an air conditioner user to compare with temperature information detected from the temperature sensor; And a control unit configured to operate the two compressors in one of simultaneous operation and single operation according to the comparison information between the room temperature detected by the temperature sensor and the desired temperature information detected by the input unit. By selectively operating compressors with different capacities, power consumption can be reduced to improve cooling efficiency.

Air conditioner, compressor

Description

Air-conditioner system for having two compressor and method for controlling the same air-conditioner}

1 is a block diagram showing a conventional air conditioner system configuration.

2 is a block diagram showing a configuration of an air conditioner system having two compressors according to the present invention;

3 is a block diagram showing a configuration for controlling two compressors according to the present invention;

4 is a flowchart illustrating a control method of an air conditioner having two compressors according to the present invention.

5 is a flowchart illustrating a process of operating both compressors of FIG. 4.

6 is a flowchart illustrating a process of operating a large-capacity compressor of the two compressors of FIG.

7 is a flowchart illustrating a process of operating a small capacity compressor during operation of the large capacity compressor of FIG. 6.

8 is a flowchart illustrating a process of operating a small capacity compressor among two compressors of FIG. 4.

FIG. 9 is a flowchart illustrating a process of operating a large capacity compressor during operation of the small capacity compressor of FIG. 8; FIG.

(Explanation of symbols for the main parts of the drawing)

100: common accumulator 200: first compressor

210: second compressor 300: first check valve

310: second check valve 400: condenser

500: expansion valve 600: evaporator

700: control unit 710: input unit

720: temperature sensor 730: timer

The present invention relates to an air conditioner having two compressors, and more particularly, to an air conditioner for simultaneously operating, alternating and solely operating two compressors according to a cooling load of a room.

In general, an air conditioner is composed of a compressor, an accumulator, an outdoor heat exchanger (hereinafter referred to as a condenser), a capillary tube, an indoor heat exchanger (hereinafter referred to as an indoor unit), and the like. Adjust the temperature to the desired level.

1 is a block diagram showing a conventional air conditioner configuration. In FIG. 1, a conventional air conditioner is a compressor 1 for compressing high temperature and high pressure, and a low temperature and high pressure liquid refrigerant state by exchanging heat and high pressure refrigerant gas transferred from the compressor 1 with surrounding air. Low-temperature and low-pressure refrigerant transferred from an expansion valve or capillary tube (5) for reducing the condenser (4) and the refrigerant transferred to the liquid state in the condenser (4) to a low-temperature, low-pressure liquid and gas state Evaporator 3 which evaporates while passing through and keeps the external temperature at a low temperature, a blower fan for discharging the air cooled in the evaporator 3 to the room, and vaporized in the evaporator 3 The accumulator 2 is configured to filter liquid refrigerant from the refrigerant gas and flow it back into the compressor, and a control unit for controlling the overall driving of the air conditioner.

Such an air conditioner typically includes a compressor (1) and a condenser (4) as an outdoor unit, an evaporator (3), a blowing fan, and a control unit as an indoor unit. Control of the air conditioner is performed through the indoor unit, and the outdoor unit stores the state information of the connected indoor unit. Monitor and control the distribution and circulation of refrigerant to the connected indoor unit.

The conventional method of operating an air conditioner detects and compares a temperature of a room where an evaporator 3 is installed with a desired temperature set by a user, and drives the compressor 1 according to a comparison result to perform a cooling operation. That is, in the conventional compressor operation method, the compressor is turned on / off according to the cooling operation of the air conditioner regardless of the indoor load.

In addition, even in the case of multi-air conditioners in which two compressors are applied, the method of controlling the compressor uses this on / off control, so even when the load in the room is small, the two compressors operate simultaneously according to the room temperature and the desired temperature set by the user. Or there is a problem that does not provide an efficient operation of the air conditioner to stop.

In addition, there is a problem in that the inefficient operation of the air conditioner does not reduce the power usage according to the use of the air conditioner.

In order to solve the above problems, the present invention provides a control method of an air conditioner system and air conditioner having two compressors that can improve the cooling efficiency by reducing the power consumption by selectively operating a compressor having a different capacity according to the cooling load of the room It aims to provide.

In order to achieve the above object, the present invention provides an air conditioner having two compressors having different compression capacities, comprising: a temperature sensor for detecting an indoor temperature; An input unit for detecting desired temperature information input from an air conditioner user to compare with temperature information detected from the temperature sensor; And a control unit configured to operate the two compressors in one of simultaneous operation and single operation according to a comparison result of the room temperature detected from the temperature sensor and the desired temperature information detected from the input unit. And a timer for counting an operation time of the compressor in the single operation when only one of the compressors is in operation alone, wherein the controller controls the operation of the compressor being stopped according to the operation time from the timer. do.

delete

In addition, the present invention provides a compressor operation control method for an air conditioner having two compressors having different compression capacities, the control unit comprising: driving both the first compressor and the second compressor; Calculating, by the controller, a difference between a current room temperature and a desired temperature input by the user and comparing the first reference temperature value for determining simultaneous operation of the first and second compressors; The difference between the room temperature and the desired temperature is the result of comparing the difference between the room temperature and the desired temperature with the first reference temperature value for determining simultaneous operation of the first and second compressors. When the determination is equal to or less than the first reference temperature value, the controller stops the operation of the first and second compressors, calculates a difference between the room temperature and the desired temperature, and compares it with the second reference temperature value for determining the operation of the first compressor alone. Making; If the result of comparing the difference between the room temperature and the desired temperature with the second reference temperature value for the first compressor alone operation determination is less than or equal to the second reference temperature value for the first compressor alone operation determination, the controller controls only the first compressor. Driving alone and calculating a difference between the room temperature and a desired temperature and comparing the third reference temperature value for determining the second compressor alone operation; And when the difference between the room temperature and the desired temperature is less than or equal to the third reference temperature value for determining the second compressor alone operation, the control unit controls the second compressor. Only driving alone.

The control unit may further include comparing the difference between the room temperature and the desired temperature with the second reference temperature while the first compressor alone operates. The control unit operates only the first compressor alone when the difference between the room temperature and the desired temperature is equal to or less than the second reference temperature value, and the difference between the room temperature and the desired temperature is equal to or greater than the second reference temperature value. Detecting a time when the first compressor is operated alone; Comparing, by the controller, a single operation time of the first compressor detected with a first reference time for determining simultaneous operation of a second compressor; And operating the second compressor during the operation of the first compressor or simultaneously operating the first and second compressors after a predetermined time after the operation of the first compressor is stopped according to the comparison result.

The control unit may further include comparing the difference between the room temperature and the desired temperature with the second reference temperature while the second compressor is operated alone. The control unit calculates a difference between the room temperature and the desired temperature when the difference between the room temperature and the desired temperature is equal to or less than the second reference temperature value, and compares the result with the third reference temperature value for determining the operation of the second compressor alone. Detecting a time when the second compressor is operated alone when the difference between the room temperature and the desired temperature is equal to or greater than the second reference temperature value; Comparing, by the controller, a single operation time of the detected second compressor with a second reference time for determining simultaneous operation of the first compressor; And operating the first compressor during the operation of the second compressor or simultaneously operating the first and second compressors after a predetermined time after the operation of the second compressor stops.

In addition, as a result of comparing the difference between the room temperature and the desired temperature with the first reference temperature value for the simultaneous operation determination of the first and second compressors, the difference between the room temperature and the desired temperature is greater than that of the first and second compressors. When the first reference temperature value for the simultaneous operation determination is equal to or greater than, the simultaneous operation of the first and second compressors is maintained.

In addition, as a result of comparing the difference between the room temperature and the desired temperature with the second reference temperature value for determining the independent operation of the first compressor, the difference between the room temperature and the desired temperature is the second reference for determining the first compressor alone operation. If the temperature is equal to or greater than the first and second compressors are operated simultaneously.

In addition, as a result of comparing the difference between the room temperature and the desired temperature with the third reference temperature value for determining the independent operation of the second compressor, the difference between the room temperature and the desired temperature is the third reference for determining the second compressor alone operation. If the temperature is equal to or higher than that, the single operation determination step of the first compressor is performed again.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

First, a description of the same configuration as that of the conventional air conditioner will be omitted. 2 is a block diagram showing a configuration of an air conditioner system having two compressors according to the present invention, Figure 3 is a block diagram showing a configuration for controlling two compressors according to the present invention.

An air conditioner having two compressors according to the present invention includes a common accumulator 100, a first compressor 200 for compressing a refrigerant, a second compressor 210 having a compression capacity smaller than that of the first compressor 200, and And first and second check valves 300 and 310 for blocking refrigerant from flowing into the compressor that is not operated when only one of the first and second compressors 200 and 210 is operated. Passed through the condenser 400 for heat-exchanging the refrigerant discharged from the first and second compressors 200 and 210, the electromagnetic expansion valve 500 and the electromagnetic expansion valve 500 to throttle the refrigerant condensed in the condenser 400 Evaporator 600 for exchanging heat by vaporizing the refrigerant, an input unit 710 for detecting desired temperature information of the room from the air conditioner user, a temperature sensor 720 for detecting the room temperature, and a temperature sensor 720 for detection Detected from the room temperature and the input unit 710 The controller 700 may control the first and second compressors 200 and 210 to operate in one of the simultaneous operation and the single operation according to the comparison information of the desired temperature information.

In addition, the control unit 700 includes a timer 730 that counts the operation time of the compressor in operation alone when only one of the first and second compressors 200 and 210 is running alone. 730 controls the immediate operation of the stationary compressor according to the time when only one of the first and second compressors 200 and 210 is operated alone. That is, the time counted by the timer 730 is, for example, when the first compressor 200 is in operation and the second compressor 210 is in the stopped state, the operation time of the first compressor 200 is counted and the second compressor ( 210 is a time for determining whether the time for achieving pressure equilibrium in a stopped state has been exceeded.

In addition, although not shown, the apparatus further includes a memory for storing first to third reference temperature values for the first and second compressors 200 and 210 to be operated simultaneously or independently according to the room temperature and the desired temperature.

Next, a control method of an air conditioner having two compressors according to the present invention will be described with reference to FIGS. 3 and 4.

When the controller 700 detects the operation of the air conditioner from the user, the controller 700 operates the first air conditioner, operates both the first and second compressors 200 and 210, and detects the inputs 710 and the temperature sensor 720, respectively. The temperature difference between the room temperature and the desired temperature is calculated from the temperature and the current room temperature to determine whether the first and second compressors are operated at the same time (S100).

The step S100 will be described in more detail with reference to FIGS. 3 and 5 as follows.

When the operation of the air conditioner is input, the controller 700 simultaneously operates the first and second compressors 200 and 210 (S110). Thereafter, the control unit 700 detects the current room temperature through the temperature sensor 720 and detects a desired temperature input by the user through the input unit 710 to calculate a difference between the detected room temperature and the desired temperature (S120). )do.

In step S120, the calculated temperature difference between the calculated room temperature and the desired temperature is compared with a first reference temperature value for determining whether the first and second compressors 200 and 210 are operated at the same time (S130). If the difference in the desired temperature is equal to or greater than the first reference temperature value for determining simultaneous operation of the first and second compressors, the control unit returns to step S110 for maintaining simultaneous operation of the first and second compressors.

In addition, when the difference between the room temperature and the desired temperature detected in step S120 in step S130 is equal to or less than a first reference temperature value for determining simultaneous operation of the first and second compressors 200 and 210, the control unit 700 controls the first operation. The operation of the first and second compressors 200 and 210 is stopped (S140).

3 and 4, after determining whether the first and second compressors 200 and 210 are operated in operation S100, the controller 700 determines whether to operate only the first compressor alone (S200). In operation S200, the operation S200 is described in detail with reference to FIGS. 6 and 7 after a predetermined time has passed since the operation of the air conditioner is as follows.

After the operation of the first and second compressors 200 and 210 is stopped by a predetermined decrease in room temperature in steps S110 to S140 (see FIG. 5), the controller 700 receives the input unit 710 and the temperature sensor 720. Through detecting the desired temperature and the room temperature, respectively, the temperature difference between the room temperature and the desired temperature is calculated (S210).

In operation S210, the temperature difference between the calculated room temperature and the desired temperature is compared with a second reference temperature value for determining that the controller 700 operates only the first compressor alone (S220). That is, when the cooling load in the room is reduced and it is not necessary to operate both the first and second compressors 200 and 210, it is determined whether the cooling is possible even by driving only the first compressor 200 having a large compression capacity.

When the difference between the room temperature and the desired temperature is greater than or equal to a second reference temperature value for determining that only the first compressor is operated alone in step S220, the controller 700 simultaneously operates the first and second compressors 200 and 210. Return to step S110 (see Fig. 5).

In operation S220, when the temperature difference between the room temperature and the desired temperature is less than or equal to a second reference temperature value for determining that only the first compressor is operated alone, the controller 700 operates only the first compressor 200 alone (S230). do. In this case, in operation S230, the second compressor 210 having a smaller compression capacity than the first compressor 200 is in a stopped state.

After only operating the first compressor 200 alone by performing the step S230, the control unit 700 detects the current room temperature and the desired temperature again to calculate a temperature difference between the room temperature and the desired temperature (S240), and the S240. The temperature difference calculated in the step is compared with a first reference temperature value for determining whether the first and second compressors 200 and 210 are simultaneously operated (S250).

When the calculated temperature difference between the calculated room temperature and the desired temperature is less than or equal to the first reference temperature in step S250, the operation of the first compressor 200 is stopped (S260). However, when the temperature difference between the room temperature and the desired temperature calculated in step S250 is greater than or equal to the first reference temperature value, the controller 700 compares the temperature difference calculated in step S240 with the second reference temperature value in step S220 (S400). do.

If the temperature difference is less than or equal to the second reference temperature in step S400, the control unit 700 allows only the first compressor 200 to be operated alone (S412). In addition, when the temperature difference is greater than or equal to the second reference temperature in step S400, the controller 700 operates only the first compressor alone, and detects the time when the first compressor 200 is operated alone from the timer 730 (S410). )do.

In operation S410, a single operation time of the first compressor 200 detected by the timer 730 is compared with a first reference time for determining whether simultaneous operation with the second compressor is possible (S420). That is, in step S420, when the first and second compressors 200 and 210 are simultaneously operated and only the second compressor 210 is stopped, the first reference time is equalized to restart the pressure of the second compressor 210. It's time needed to maintain.

If the operation time of the first compressor 200 is less than or equal to the first reference time in step S420, the controller 700 stops the operation of the first compressor 200 (S422), and in step S422, the first compressor ( After the predetermined time delay (S423) from when the 200 is stopped (S423), the first and second compressors 200 and 210 are simultaneously operated. In step S423, a delay of a predetermined time is detected through a timer 730.

In addition, when the operation time of the first compressor 200 is greater than or equal to the first reference time in step S420, the controller 700 operates the second compressor 210 to operate simultaneously while the first compressor 200 is in operation ( S430).

Referring to FIGS. 3 and 4 again, in operation S200, only the first compressor 200 is determined to be operated alone, and then the controller 700 determines whether to operate only the second compressor at operation S300. The step S300 is described in more detail with reference to FIGS. 8 and 9 after a predetermined time has passed since the first operation of the first compressor 200 is as follows.

After the operation of the first and second compressors 200 and 210 is stopped by the predetermined temperature decrease in a step S2600 (see FIG. 6), the control unit 700 receives the input unit 710 and the temperature sensor 720. The desired temperature and the room temperature are respectively detected to calculate a temperature difference between the indoor temperature and the desired temperature (S310).

In operation S310, the temperature difference between the calculated room temperature and the desired temperature is compared with a third reference temperature value for determining that the controller 700 operates only the second compressor alone (S320). That is, when the cooling load of the room is reduced and the simultaneous operation of the first and second compressors 200 and 210 or the first compressor 200 having a large compression capacity do not need to be operated alone, the second compressor 210 having a small compression capacity is required. It is determined whether the cooling is possible even if it is driven alone.

If the difference between the room temperature and the desired temperature is greater than or equal to a third reference temperature value for determining that only the second compressor is operated alone in step S320, the controller 700 determines whether only the first compressor 200 can be operated alone. Return to step (see Fig. 6).

In addition, when the temperature difference between the room temperature and the desired temperature is less than or equal to a third reference temperature value for determining that only the second compressor is operated alone in step S320, the controller 700 operates only the second compressor 210 alone (S330). do. In this case, in step S330, the first compressor 200 having a larger compression capacity than the second compressor 210 is in a stopped state.

After only operating the second compressor 210 alone by performing the step S330, the control unit 700 detects the current room temperature and the desired temperature again to calculate a temperature difference between the room temperature and the desired temperature (S340), and the S340. The temperature difference calculated in the step is compared with a first reference temperature value for determining whether the first and second compressors 200 and 210 are simultaneously operated (S350).

When the calculated temperature difference between the calculated room temperature and the desired temperature is equal to or less than the first reference temperature value in operation S350, the operation of the second compressor 210 is stopped (S360). However, when the temperature difference between the room temperature and the desired temperature calculated in step S350 is greater than or equal to the first reference temperature value, the controller 700 compares the temperature difference calculated in step S340 with the second reference temperature value (S500).

If the temperature difference is less than or equal to the second reference temperature in step S500, the control unit 700 performs step S310 to determine whether only the first compressor 200 or the second compressor 210 can be operated alone.

In addition, when the temperature difference is greater than or equal to the second reference temperature in step S500, the control unit 700 operates only the second compressor 210 alone, and determines the time when the second compressor 210 is operated alone from the timer 730. Detection (S510).

In operation S510, a single operation time of the second compressor 210 detected by the timer 730 is compared with a second reference time for determining whether simultaneous operation with the first compressor is possible (S520). That is, in step S520, when the first and second compressors 200 and 210 are simultaneously operated and only the first compressor 200 is stopped, the second reference time may be a pressure balance for restarting the first compressor 200. It's time needed to maintain.

When the operation time of the second compressor 210 is less than or equal to the second reference time in step S520, the control unit 700 stops the operation of the second compressor 200 (S522), and in step S522, the second compressor 210. The first and second compressors 200 and 210 are simultaneously operated after a predetermined time delay (S523) from the point where the) is stopped. In step S523, the delay of the predetermined time is detected through the timer 730.

In addition, when the operation time of the second compressor 210 is greater than or equal to the second reference time in step S520, the control unit 700 operates the first compressor 200 while the second compressor 210 is operating at the same time. S530).

Therefore, the first and second compressors 200 and 210 may be operated simultaneously or independently according to the cooling load of the room.

As described above, the present invention has the advantage of improving the cooling efficiency by reducing the power consumption by selectively operating compressors with different capacities according to the cooling load of the room.

In addition, the present invention has the advantage that more efficient cooling is achieved in the air conditioner consisting of one common accumulator and the first and second compressors having different capacities, one condenser and one indoor unit.

In the above, the present invention has been illustrated and described with respect to certain preferred embodiments. However, the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains can vary as many as possible without departing from the spirit of the present invention as set forth in the claims below. Changes may be made.

Claims (8)

An air conditioner with two compressors with different compression capacities, A temperature sensor for detecting indoor temperature; An input unit for detecting desired temperature information input from an air conditioner user to compare with temperature information detected from the temperature sensor; And And a control unit for allowing the two compressors to be operated in one of a simultaneous operation and a single operation according to a comparison result of the room temperature detected from the temperature sensor and the desired temperature information detected from the input unit. When only one of the two compressors are running alone, the timer further comprises a timer for counting the operation time of the compressor in operation alone, the control unit to stop the operation of the compressor is stopped according to the operation time from the timer Air conditioning system with two compressors to control. delete A compressor operation control method of an air conditioner having two compressors having different compression capacities, a) controlling, by the controller, both the first compressor and the second compressor; b) calculating, by the controller, a difference between a current room temperature and a desired temperature input by the user and comparing the first reference temperature value for determining simultaneous operation of the first and second compressors; c) when the difference between the room temperature and the desired temperature is equal to or less than a first reference temperature value for determining simultaneous operation of the first and second compressors, the controller stops the operation of the first and second compressors. Calculating a difference between the room temperature and a desired temperature and comparing the second reference temperature value for determining the first compressor alone operation; d) when the difference between the room temperature and the desired temperature is less than or equal to the second reference temperature value for determining the first compressor alone operation, the controller operates only the first compressor alone, and the difference between the room temperature and the desired temperature. Calculating and comparing with a third reference temperature value for determining the second compressor alone operation; And e) when the difference between the room temperature and the desired temperature is less than or equal to the third reference temperature value for determining the second compressor alone operation, the controller may independently operate only the second compressor. Control method of having air conditioner. 4. The method of claim 3, wherein step d further comprises: the control unit comparing the difference between the room temperature and the desired temperature with the second reference temperature value while the first compressor is operated alone; The control unit operates only the first compressor alone when the difference between the room temperature and the desired temperature is equal to or less than the second reference temperature value, and the difference between the room temperature and the desired temperature is equal to or greater than the second reference temperature value. Detecting a time when the first compressor is operated alone; Comparing, by the controller, a single operation time of the first compressor detected with a first reference time for determining simultaneous operation of a second compressor; And Driving the second compressor during the operation of the first compressor according to the comparison result, or simultaneously operating the first and second compressors after a predetermined time after the operation of the first compressor is stopped. Control method of having air conditioner. 4. The method of claim 3, wherein step e comprises: comparing, by the control unit, the difference between the room temperature and the desired temperature with the second reference temperature value while the second compressor is operated alone; The controller performs step d when the difference between the room temperature and the desired temperature is equal to or less than the second reference temperature value, and the second compressor when the difference between the room temperature and the desired temperature is equal to or greater than the second reference temperature value. Detecting a time that the unit is operated alone; Comparing, by the controller, a single operation time of the detected second compressor with a second reference time for determining simultaneous operation of the first compressor; And Driving the first compressor during the operation of the second compressor according to the comparison result, or simultaneously operating the first and second compressors after a predetermined time after the operation of the second compressor is stopped. Control method of having air conditioner. 4. The simultaneous operation of the first and second compressors of claim 3, wherein the difference between the room temperature and the desired temperature is equal to or greater than a first reference temperature value for determining simultaneous operation of the first and second compressors. Control method of an air conditioner having two compressors to maintain. 4. The two compressors of claim 3, wherein when the difference between the room temperature and the desired temperature is greater than or equal to a second reference temperature value for determining the first compressor alone operation, the two compressors simultaneously operating the first and second compressors. Control method of having air conditioner. 4. The two compressors of claim 3, wherein when the difference between the room temperature and the desired temperature is equal to or greater than a third reference temperature value for determining the operation of the second compressor alone, the two compressors for performing the single operation determination of the first compressor are performed. Control method of air conditioner having.

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