KR100626424B1 - Method for control defrosting of multi type air conditioner - Google Patents

Abstract

The present invention relates to a defrosting control method of a two-cycle multi-type air conditioner having two compressors and one outdoor fan. The defrosting operation is performed according to an operation mode (one-room heating, two-room heating, or a combined heating and cooling operation). Its purpose is to ensure product performance and system stability by controlling differently.

To this end, the present invention, in the control method of a multi-type air conditioner having a plurality of compressors to form a plurality of independent refrigeration cycle, the plurality of indoor units connected to the plurality of compressors are cooled or heated operation according to the selected operation mode, It is determined whether at least one of the plurality of indoor units is a heating operation, and when at least one of the indoor units is a heating operation, the temperature of the outdoor heat exchanger in the heating operation is sensed, and the temperature of the detected outdoor heat exchanger is compared with a predetermined defrosting operation temperature. If the outdoor heat exchanger temperature is within the defrosting operation temperature range, the defrosting operation is controlled according to the operation mode of the plurality of indoor units.

Description

Defrosting control method of multi type air conditioner {Method for control defrosting of multi type air conditioner}

1 is a refrigerant flow path of a multi-type air conditioner according to the present invention;

2 is a defrost control configuration diagram of a multi-type air conditioner according to an embodiment of the present invention;

3 is an operation flowchart of a defrost control method of a multi-type air conditioner according to the present invention;

4 is an operation flowchart of a heating side defrosting control method of a multi-type air conditioner according to the present invention;

5 is an operation flowchart of a cooling side defrost control method of a multi-type air conditioner according to the present invention;

Explanation of symbols on the main parts of the drawings

10: outdoor unit 12a, 12b: compressor

14a, 14b: Four-way valve 16a, 16b: Outdoor heat exchanger

18: outdoor fan 22a, 22b: electric valve

26a, 26b: Outdoor piping temperature sensor 30,40: Indoor unit A, B

150: control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-type air conditioner for both heating and cooling, having a plurality of compressors to form a plurality of independent refrigeration cycles, and more particularly, to a defrosting control method for a multi-type air conditioner for removing frost generated on the surface of an outdoor heat exchanger. .

In general, an air conditioner is a device used for cooling or heating a room, and a general refrigeration cycle in which a refrigerant is circulated therein is applied to the air conditioner, so that when the liquid refrigerant evaporates, Cooling or heating is performed by the characteristic of absorbing the heat and releasing the heat, and the cooling or heating of the air conditioner is determined by the circulation direction of the refrigerant.

On the other hand, a conventional air conditioner is generally installed one air conditioner for each indoor space, but recently, a multi-type air conditioner to improve the efficiency by having two or more such refrigeration cycles in one air conditioner Groups are widely used. Such a multi-type air conditioner performs cooling or heating operations for a plurality of indoor spaces, respectively.

When the heating operation is performed in such a multi-type air conditioner, the surface temperature of the outdoor heat exchanger is relatively lower than that of the atmosphere. As a result, the surface of the outdoor heat exchanger adheres moisture condensed from a relatively high temperature atmosphere. However, this moisture freezes due to the low temperature of the surface of the outdoor heat exchanger and starts to form on the surface of the outdoor heat exchanger.

The moisture freezing on the surface of the outdoor heat exchanger becomes thicker with time, which reduces the air volume of the outdoor air passing through the outdoor heat exchanger, thereby reducing the heat exchange efficiency between the heat exchange medium and the outdoor air in the outdoor heat exchanger. Therefore, defrosting operation to remove the frost attached to the outdoor heat exchanger is required.

In the multi-type air conditioner, the defrosting operation is performed when the defrosting operation is performed by any one indoor unit while a plurality of indoor units are operating, and stops the operation of all indoor units regardless of the operation of other indoor units. While the outdoor fan is turned off and the refrigeration cycle is switched to cooling, the compressed heat exchange medium is supplied to the corresponding outdoor heat exchanger so that the heat exchange medium is liquefied in the outdoor heat exchanger. To remove the frost attached.

However, in the defrosting operation method of the conventional multi-type air conditioner, in the two-cycle type air conditioner using one outdoor fan in common, two independent refrigeration cycles independently operate only one refrigeration cycle during defrosting operation. There was a problem that the performance of the product and the stability of the system cannot be guaranteed unless the control is performed and the separate control of the other refrigeration cycle.

Accordingly, the present invention is to solve the conventional problems as described above, the object of the present invention is a two-cycle multi-type air conditioner with two compressors operating mode (1 room heating, 2 room heating or air-conditioning mixed use It is to provide a defrosting control method of a multi air conditioner that can guarantee the product performance and system stability by controlling the defrosting operation differently.

In order to achieve the above object, the present invention provides a control method of a multi-type air conditioner having a plurality of compressors to form a plurality of independent refrigeration cycles, wherein a plurality of indoor units connected to the plurality of compressors are cooled or heated according to a selected operation mode. Determine whether at least one of the plurality of indoor units is a heating operation, and if at least one of the indoor units is a heating operation, sense a temperature of an outdoor heat exchanger in heating operation, and determine a temperature of the detected outdoor heat exchanger in a predetermined defrosting operation temperature. When the outdoor heat exchanger temperature is in the defrosting operation temperature range compared to the control operation of the defrosting operation according to the operation mode of the plurality of indoor units; When the operation mode of the plurality of indoor units is a one-room heating operation, the compressor and the outdoor fan are stopped, the four-way valve is switched to the cooling mode, and the compressor is operated at the maximum to perform defrosting operation.

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In addition, the present invention provides a control method of a multi-type air conditioner having a plurality of compressors to form a plurality of independent refrigeration cycles, wherein the plurality of indoor units connected to the plurality of compressors are cooled or heated in accordance with a selected operation mode. It is determined whether at least one of the plurality of indoor units is a heating operation, and when at least one of the indoor units is a heating operation, the temperature of the outdoor heat exchanger in the heating operation is sensed, and the detected temperature of the outdoor heat exchanger is compared with a predetermined defrosting operation temperature. If the outdoor heat exchanger temperature is a defrosting operation temperature range, the defrosting operation is controlled according to the operation mode of the plurality of indoor units; When the operation mode of the plurality of indoor units is two-room heating operation, if the defrost control condition is satisfied even in one room, the two-room compressor and the outdoor fan are stopped, the four-way valve is switched to the cooling mode, and the two-room compressor is operated at the maximum defrosting operation. And one of the two rooms waits until the defrost control is finished even if the first defrosting control is completed.

In addition, the present invention provides a control method of a multi-type air conditioner having a plurality of compressors to form a plurality of independent refrigeration cycles, wherein the plurality of indoor units connected to the plurality of compressors are cooled or heated in accordance with a selected operation mode. It is determined whether at least one of the plurality of indoor units is a heating operation, and when at least one of the indoor units is a heating operation, the temperature of the outdoor heat exchanger in the heating operation is sensed, and the detected temperature of the outdoor heat exchanger is compared with a predetermined defrosting operation temperature. If the outdoor heat exchanger temperature is a defrosting operation temperature range, the defrosting operation is controlled according to the operation mode of the plurality of indoor units; When the operation mode of the plurality of indoor units is a mixed heating and cooling operation, when the heating side becomes the defrost control condition, the two-chamber compressor and the outdoor fan are stopped, the four-way valve is switched to the cooling mode, and the heating-side compressor is operated to the maximum. The defrosting operation is performed, and the cooling side compressor waits in a stopped state until the defrosting control on the heating side is completed.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a refrigerant flow diagram of a multi-type air conditioner according to the present invention.

In FIG. 1, the multi-type air conditioner of the present invention includes one outdoor unit 10 forming an independent refrigeration cycle, and a plurality of indoor units 30 and 40 connected to the outdoor unit 10 to perform indoor cooling and heating. A refrigerant pipe is installed between the plurality of indoor units 30 and 40 and the outdoor unit 10.

The outdoor unit 10 includes a plurality of (eg, two) first and second compressors 12a and 12b for compressing a refrigerant into a gaseous state of high temperature and high pressure, and the first and second compressors 12a and 12b. In the first and second four-way valve (14a, 14b) and the first and second compressors (12a, 12b) for adjusting the flow direction of the high-temperature high-pressure gas refrigerant compressed by the operating mode (cooling or heating) First and second outdoor heat exchangers 16a and 16b that receive a compressed high-temperature, high-pressure gas refrigerant and exchange heat with outdoor air, and first and second electric valves that decompress and expand the heat-exchanged refrigerant while controlling the refrigerant flow rate. 22a, 22b).

One side of the first and second outdoor heat exchangers (16a, 16b) for forced air blowing by the outdoor fan motor 20 to the heat exchange in the first and second outdoor heat exchangers (16a, 16b) The outdoor fan 18 is installed, and the refrigerant flowing into the first and second compressors 12a and 12b on the suction side of the first and second compressors 12a and 12b is converted into gas in a completely gaseous state. First and second accumulators 24a and 24b are provided.

In addition, the first and second outdoor heat exchangers 16a and 16b include first and second outdoor pipe temperature sensors 26a and 26b for detecting pipe temperatures of the first and second indoor heat exchangers 16a and 16b. The first and second outdoor piping temperature sensors (26a, 26b) are installed as well as the first and second outdoor heat exchangers (16a, 16b) as well as the piping of the first and second outdoor heat exchangers (16a, 16b). It may be installed at any position that can sense the refrigerant temperature passing through.

The first and second indoor heat exchangers (30, 40) are the first and second indoor heat exchangers (32, 42) for receiving heat and heat exchange with the indoor air, and the first and second indoor heat exchangers (32, 42) The first and second indoor fan (36,46) for forcibly blowing the indoor air by the first and second indoor fan motors (34, 44) to perform heat exchange in the).

As such, a multi-type air conditioner having two compressors 12a and 12b to form two independent refrigeration cycles can be cooled or heated. One-room cooling operation, one-room heating operation, two-room cooling operation and two-room It can be operated in the operation mode of heating operation and air-conditioning mixed operation.

In such a multi-type air conditioner, when heated, the first and second four-way valves 14a and 14b are turned on so that the refrigerant flows from the first compressor 12a to the first four-way valve 14a in the dotted arrow direction of FIG. 1. The first indoor heat exchanger (32) → the first electric motor (22a) → the first outdoor heat exchanger (16a) → the first four-way valve (14a) → the first accumulator (24a) → the first compressor (12a) Refrigeration cycle and the second compressor (12b) → the second four-way valve (14b) → the second indoor heat exchanger (42) → the second motor (22b) → the second outdoor heat exchanger (16b) → the second four-way valve A freezing cycle circulated in the order of (14b)-> second accumulator 24b-> second compressor 12b.

On the other hand, during cooling, the first and second four-way valves 14a and 14b are turned off so that the refrigerant flows along the solid arrow direction of FIG. 1 from the first compressor 12a to the first four-way valve 14a to the first outdoor heat exchanger. (16a) the first electric motor 22a → the first indoor heat exchanger 32 → the first four-way valve 14a → the first accumulator 24a → the first compressor 12a, and Second compressor (12b) → Second four-way valve (14b) → Second outdoor heat exchanger (16b) → Second electric heat exchanger (22b) → Second indoor heat exchanger (42) → Second four-way valve (14b) → First It forms a refrigeration cycle circulated in the order of 2 accumulator (24b) → second compressor (12b).

Figure 2 is a defrost control configuration diagram of a multi-type air conditioner according to an embodiment of the present invention, the signal input unit 100, the room temperature detection unit 110, the first piping temperature detection unit 120, the second piping temperature Comprising the sensing unit 130, the driving current detection unit 140, the controller 150, the compressor driver 160, the outdoor fan motor driver 170, the indoor fan motor driver 180 and the valve driver 190 do.

The signal input unit 100 inputs operation information such as an operation mode selected by a user (1 room cooling, 1 room heating, 2 room cooling, 2 room heating or air-conditioning mixed operation) and a set temperature, and the indoor temperature detection unit ( 110 detects the indoor air temperature sucked into the first or second indoor (30, 40).

The first pipe temperature detection unit 120 is composed of a first outdoor pipe temperature sensor 26a and the like for sensing the temperature of the first outdoor heat exchanger (16a), the second pipe temperature detection unit 130 is a second And a second outdoor piping temperature sensor 26b for sensing the temperature of the outdoor heat exchanger 16b, and the driving current detecting unit 140 supplies the operating currents applied to the first and second compressors 12a and 12b. Detect.

The controller 150 has a predetermined time elapsed when the temperature of the first or second outdoor heat exchangers 16a and 16b is less than or equal to a predetermined temperature and the operating current of the first or second compressors 12a and 12b is a constant current. When the defrosting operation condition is satisfied as described below, the defrosting operation is controlled according to an operating state (one-room heating, two-room heating or a combined heating and cooling operation), and includes indoor units 30 and 40 microcomputers or outdoor unit 10 microcomputers. .

The compressor driver 160 controls the driving of the first and second compressors 12a and 12b according to the compressor control signal of the controller 150, and the outdoor fan motor driver 170 controls the outdoor fan of the controller 150. The driving of the outdoor fan motor 20 is controlled according to the signal.

The indoor fan motor driver 180 controls the driving of the indoor fan motors 34 and 44 according to the indoor fan control signal of the controller 150, and the valve driver 190 according to the valve control signal of the controller 150. The driving of the first and second four-way valves 14a and 14b and the first and second motor-side valves 22a and 22b is controlled.

Hereinafter, an operation process and an operation effect of the defrost control method of the multi-type air conditioner configured as described above will be described.

3 is an operation flowchart of a defrost control method of a multi-type air conditioner according to the present invention, which is for defrost control in a single room heating operation, a two-room heating operation, and a combined heating and cooling operation.

First, operation information such as operation mode selected by the user (1 room cooling, 1 room heating, 2 room cooling, 2 room heating, air-conditioning mixed operation) and setting temperature is input to the controller 150 through the signal input unit 100. do.

The controller 150 controls the valve driver 190 according to the selected operation mode to control the first or second four-way valves 14a and 14b to be switched to a cooling or heating cycle, and controls the compressor driver 160 to control the valve driver 190. The first or second compressors 12a and 12b are driven.

Therefore, the controller 150 checks the current operation mode to determine whether any one of Room A or Room B is heating operation (S100), and if any one is not heating operation (NO), the current operation control (cooling operation). Return while maintaining (S110).

If any of the heating operation (YES) is determined to be a single room operation (S200), if the one room operation (YES) while the heating operation is performed by sensing the temperature of the outdoor heat exchanger (16a or 16b) to enter the defrost control If it is a condition (S210), and if it is not the defrost control entry condition (NO), it returns while maintaining the current operation control (1 room heating operation) (S600).

If the defrost control entry condition (YES), the compressor 12a or 12b and the outdoor fan 18 are stopped, the four-way valve 14a or 14b is switched to the cooling mode, and the compressor 12a or 12b is turned up. In operation S220, a single room defrosting control operation is performed to remove the idea of the outdoor heat exchanger 16a or 16b.

After the one-room defrost control operation, the temperature of the outdoor heat exchanger 16a or 16b rises to determine whether the defrost control is a departure condition (S230). If the defrost control is a departure condition, the compressor 12a or 12b and the outdoor fan 18 are defrosted. ) Is returned to the operation mode before the defrost control (S500).

In step S200, if it is not a single room operation (NO), it is determined whether it is a mixed heating and heating operation (S300), and if it is a mixed heating and cooling operation (YES), it is determined whether the heating side is a defrost control entry condition (S310).

If the defrost control entry condition (NO) is returned while maintaining the current operation control (mixed air-conditioning operation) (S600).

If the heating side is a defrost control entry condition (YES), the two chambers stop the compressors 12a and 12b and the outdoor fan 18, and the heating four-way valve 14a or 14b is switched to cooling, and then the heating side compressor ( 12a or 12b) is operated to the maximum to perform the heating-side defrost control operation to remove the frosting of the heating-side outdoor heat exchanger (16a or 16b), wherein the cooling side stops the compressor (12b or 12a) until the defrost control is finished. To wait (S320).

After the heating-side defrost control operation, the temperature of the heating-side outdoor heat exchanger 16a or 16b rises to determine whether the heating side is a defrost control departure condition (S330), and if the heating side is a defrost control departure condition, the two-room compressor 12a. 12b) and the outdoor fan 18 are returned to the operation mode before the defrost control (S600).

In the step S300, the mixed air-conditioning operation (NO) or two-room heating operation, it is determined whether even one of the two room defrost control entry conditions (S400), if the defrost control entry conditions (NO) the current operation control (2 rooms Return while maintaining the heating operation (S500).

If at least one of the two chambers is in the defrost control entry condition (YES), both of the two chambers stop the compressors 12a and 12b and the outdoor fan 18, and the two chambers switch the four-way valves 14a and 14b to cooling, The two chamber compressors 12a and 12b are operated to the maximum to perform defrost control operation of both chambers to remove the frost of the two outdoor heat exchangers 16a and 16b (S410).

After the defrost control operation in both chambers, the temperature of the outdoor heat exchangers 16a and 16b rises to determine whether the two chambers are out of the defrost control condition (S420), and if the two chambers are not in the defrost control departure condition (NO) The unfinished side continues to perform defrost control operation, and the end of defrosting waits until the remaining one meets the defrost control departure condition (S430).

If both chambers are out of the defrost control condition (YES), the two chamber compressors 12a and 12b and the outdoor fan 18 are returned to the operation mode before the defrosting control (S500).

4 is an operation flowchart of a heating-side defrost control method of a multi-type air conditioner according to the present invention for defrost control during heating operation.

In FIG. 4, the temperature of the outdoor heat exchangers 16a and 16b is sensed while the heating operation is performed, and a predetermined time has elapsed at a temperature below the predetermined temperature which is the defrosting operation temperature range. In operation S1000 to S1100, it is determined whether the operation current of (12b) is less than or equal to the predetermined value and satisfies all the defrosting operation conditions.

If the defrost control entry condition (NO) is returned while maintaining the current operation control (1 room heating, 2 room heating or air-conditioning mixed operation) (S1200).

If the defrost control entry condition (YES), the compressor 12a, 12b, the outdoor fan 18, and the indoor fan 36, 46 are all stopped and the opening degree of the electric valves 22a, 22b is controlled to the maximum and the four-way valve 14a is stopped. After switching to and in the cooling mode (S1300), the compressors 12a and 12b are operated to the maximum to perform the defrosting control operation to remove the idea of the outdoor heat exchangers 16a and 16b (S1400).

Defrost control departure condition that performs the defrost control operation and the temperature of the outdoor heat exchangers 16a and 16b rises above a certain temperature or the operating current of the compressors 12a and 12b rises to the normal current to satisfy all the defrosting termination conditions. The authorization is determined (S1500).

If the defrost control is out of condition (YES), the compressors 12a and 12b are paused, the openings of the electric valves 22a and 22b are controlled before the defrosting control, and the four-way valves 14a and 14b are switched to the heating mode (S1600). S1700, the compressors 12a and 12b, the outdoor fans 18, and the indoor fans 36 and 46 are returned to the operation before the defrost control to perform normal operation (S1800).

5 is an operation flowchart of a cooling side defrost control method of a multi-type air conditioner according to the present invention, and is for defrost control during a cooling operation.

In FIG. 5, while the cooling operation is performed, the temperature of the heating-side outdoor heat exchanger 16a or 16b is sensed to determine whether the heating-side is a defrost control entry condition (S2000 to S2100).

If the heating side is the defrost control entry condition (YES), the cooling compressor 12a or 12b is stopped and waits until the defrosting control of the heating side is finished (S2200).

It is determined whether the heating side is the defrost control departure condition (S2300), and if the defrost control departure condition (YES), the compressors 12a and 12b and the outdoor fan 18 are returned to the operation before the defrost control to perform normal operation ( S2400).

What has been described above is only one embodiment for carrying out the defrosting control method of the multi-type air conditioner according to the present invention, the present invention is not limited to the above-described embodiment, it is within the technical spirit of the present invention Various modifications are possible by those skilled in the art.

As described above, according to the defrosting control method of the multi-type air conditioner according to the present invention, an operation mode (one-room heating, two-room heating) in a multi-type air conditioner having two compressors and forming two independent refrigeration cycles. Alternatively, the defrosting operation can be controlled differently according to the combined heating and cooling operation) to ensure product performance and system stability.

Claims (5)

delete delete In the control method of a multi-type air conditioner having a plurality of compressors to form a plurality of independent refrigeration cycles, Cooling or heating the plurality of indoor units connected to the plurality of compressors according to the selected operation mode, Determining whether at least one of the plurality of indoor units is a heating operation, If at least one heating operation, the temperature of the outdoor heat exchanger in the heating operation is detected, Comparing the sensed temperature of the outdoor heat exchanger with a predetermined defrosting operation temperature and controlling defrosting operation according to an operation mode of the plurality of indoor units if the outdoor heat exchanger temperature is within a defrosting operation temperature range; When the operation mode of the plurality of indoor units is a one-room heating operation, the compressor and the outdoor fan are stopped, the four-way valve is switched to the cooling mode, and the compressor is operated at the maximum to perform the defrosting operation. Defrost control method. In the control method of a multi-type air conditioner having a plurality of compressors to form a plurality of independent refrigeration cycles, Cooling or heating the plurality of indoor units connected to the plurality of compressors according to the selected operation mode, Determining whether at least one of the plurality of indoor units is a heating operation, If at least one heating operation, the temperature of the outdoor heat exchanger in the heating operation is detected, Comparing the sensed temperature of the outdoor heat exchanger with a predetermined defrosting operation temperature and controlling defrosting operation according to an operation mode of the plurality of indoor units if the outdoor heat exchanger temperature is within a defrosting operation temperature range; When the operation mode of the plurality of indoor units is two-room heating operation, if the defrost control condition is satisfied even in one room, the two-room compressor and the outdoor fan are stopped, the four-way valve is switched to the cooling mode, and the two-room compressor is operated at the maximum defrosting operation. And defrosting control method of a multi-type air conditioner, characterized in that one of the two chambers waits until the end of the defrosting control even if one of the first end of the defrosting control. In the control method of a multi-type air conditioner having a plurality of compressors to form a plurality of independent refrigeration cycles, Cooling or heating the plurality of indoor units connected to the plurality of compressors according to the selected operation mode, Determining whether at least one of the plurality of indoor units is a heating operation, If at least one heating operation, the temperature of the outdoor heat exchanger in the heating operation is detected, Comparing the sensed temperature of the outdoor heat exchanger with a predetermined defrosting operation temperature and controlling defrosting operation according to an operation mode of the plurality of indoor units if the outdoor heat exchanger temperature is within a defrosting operation temperature range; When the operation mode of the plurality of indoor units is a mixed heating and cooling operation, when the heating side becomes the defrost control condition, the two-chamber compressor and the outdoor fan are stopped, the four-way valve is switched to the cooling mode, and the heating-side compressor is operated to the maximum. A defrosting control method for a multi-type air conditioner, wherein the defrosting operation is performed and the cooling compressor waits in a stopped state until the defrosting control on the heating side is completed.

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