KR100705223B1 - Method for dissolving partial overload in air conditioner - Google Patents

Abstract

The present invention increases the cooling capacity by accurately detecting an indoor unit having an increased cooling load when the cooling load is increased only in any one indoor unit among a plurality of indoor units provided in the refrigeration cycle.

According to the present invention, it is determined whether one of the plurality of indoor units provided in the air conditioner is overloaded only, and whether or not the second plurality of indoor units is overloaded. In this case, by increasing the amount of refrigerant flowing into the evaporator of the first indoor unit while increasing the compression capacity of the refrigerant to increase the cooling capacity of the overloaded first indoor unit to solve the overload at a high speed.

Air conditioner, partial overload, compressor, cooling operation,

Description

Method for dissolving partial overload in air conditioner

1 is a view showing a configuration of a multi-type air conditioner to which the partial overload cancellation method of the present invention is applied.

Figure 2 is a control block diagram of an air conditioner to which the partial overload cancellation method of the present invention is applied.

Figure 3 is a signal flow diagram showing a partial overload cancellation method of the present invention.

* Explanation of symbols for main parts of drawings *

100: accumulator 110, 120: first and second compressor

112, 122: countercurrent prevention means 130: condenser

140a, 140b,... : A plurality of expansion mechanisms 150a, 150b,... : Multiple Evaporators

200: user input unit 210: temperature detector

220: control unit 230: compressor driving unit

240: expansion mechanism drive unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for canceling a partial overload of an air conditioner in which an air conditioner provided with a plurality of indoor units can effectively eliminate the overload when a specific indoor unit is overloaded.

In general, an air conditioner inhales high temperature air in a room, exchanges heat in an evaporator of a refrigeration cycle, and cools the room while repeatedly performing an operation of discharging low temperature air generated by the heat exchange.

The refrigeration cycle typically consists of a compressor, a condenser, an expansion device and an evaporator.

The compressor compresses the gas refrigerant of low temperature and low pressure to convert it into a gas refrigerant of high temperature and high pressure, and converts the gas refrigerant of high temperature and high pressure converted from the compressor into a liquid refrigerant of high temperature and high pressure by condensing the condenser.

The expansion mechanism expands the high temperature and high pressure liquid refrigerant condensed in the condenser and converts the low temperature and low pressure liquid refrigerant into the low temperature and low pressure liquid refrigerant. Convert to refrigerant.

The low-temperature low-pressure gas refrigerant converted by the heat exchange in the evaporator is repeated to convert the high-temperature high-pressure gas refrigerant in the compressor again.

That is, the refrigerating cycle includes a compressor, a condenser, an expansion mechanism, and an evaporator to repeat the cycle of compressing, condensing, expanding, and evaporating the refrigerant, heat-exchanging the evaporator to generate cold air, and cooling the discharged cold air to the room. will be.

In an air conditioner having such a refrigeration cycle, components that generate a lot of noise and heat, for example, a compressor and a condenser are usually provided in an outdoor unit.

In addition, the expansion device and the evaporator which generate little air and generate little noise are provided in the indoor unit, and the outdoor unit and the indoor unit are connected by connecting pipes.

Recently, in order to increase the cooling capacity of the air conditioner, the spread of the air conditioner including two or more compressors in the outdoor unit and connecting the plurality of indoor units to cool the plurality of rooms respectively is activated.

In an air conditioner having a plurality of indoor units, a cooling load increases only in a room where a specific indoor unit is cooled, and a cooling load does not increase in a room where other indoor units are cooled, and it is often kept constant. .

In this case, if the air conditioner is operated according to the room temperature detected by each indoor unit, the cooling capacity is decreased in the room where the cooling load is increased, and the user is cold because the cooling load is maintained in the room where the cooling load is kept constant.

Therefore, the air conditioner equipped with a plurality of indoor units accurately detects when the cooling load increases only in a room where a specific indoor unit is cooling, and increases only the cooling capacity of the indoor unit where the cooling load is increased, thereby rapidly increasing the indoors. It needs to be cooled.

It is an object of the present invention to provide a method for relieving partial overload of an air conditioner that can accurately detect a specific indoor unit having an increased cooling load when the cooling load of a specific indoor unit is increased and the cooling load of another indoor unit is not increased. .

It is another object of the present invention to provide a method for relieving partial overload of an air conditioner that increases the cooling capacity of a specific indoor unit in which the cooling load is increased when the cooling load is increased only in a specific indoor unit so that the indoor unit can be cooled at a high speed. There is.

According to the partial overload elimination method of the present invention having such an object, the temperature of the indoor air in which each indoor unit is installed is used to detect whether the cooling load of the indoor unit is increased.

To this end, the present invention includes a temperature sensor in each indoor unit to detect the indoor temperature, and determines whether the cooling load is increased only in a specific indoor unit by the detected indoor temperature of each indoor unit.

In addition, even if the cooling load is increased in a specific indoor unit, the increased cooling load does not continue, and the cooling load may be increased only temporarily.

Therefore, in the present invention, when the cooling load is increased in a specific indoor unit, it is determined whether the state in which the cooling load is increased continues for a predetermined time or more, and as a result, when the cooling load is increased in the specific indoor unit for a predetermined time or more. In our view, the cooling load has increased.

When it is finally determined that the cooling load increases only in a specific indoor unit and that the cooling load does not increase in another indoor unit, the cooling capacity is increased by increasing the amount of refrigerant flowing into the specific indoor unit where the cooling load is increased.

Here, the present invention controls the amount of the refrigerant flowing into a specific indoor unit by using an expansion mechanism that can adjust the amount of passage of the refrigerant, such as a linear expansion valve (Linear Expansion Valve).

In addition, when the amount of the refrigerant flowing into a specific indoor unit having an increased cooling load increases, the other indoor unit in which the cooling load is kept constant may cause a decrease in cooling capacity due to a decrease in the amount of the refrigerant introduced.

In the present invention, when a plurality of compressors are provided, the current state of the compressors is determined, and as a result of the determination, when the compressors are not driven at the maximum compression capacity, the amount of refrigerant flowing into a specific indoor unit having increased cooling load is increased. In addition, it is controlled to operate by increasing the refrigerant compression capacity of the compressors.

Therefore, according to the present invention, it is possible to cool the room at a high speed by increasing the amount of the refrigerant flowing into a specific indoor unit having an increased cooling load without lowering the cooling capacity of the other indoor unit in which the cooling load is kept constant.

Therefore, the method of eliminating the partial overload of the present invention may include determining whether or not only one first indoor unit is overloaded among the plurality of indoor units provided in the air conditioner, and when the result is determined that the first indoor unit is overloaded only. It characterized in that it comprises the step of increasing the amount of refrigerant flowing into the evaporator of the first indoor unit.

The step of increasing the amount of the refrigerant flowing into the evaporator of the first indoor unit is characterized by increasing the compression capacity of the refrigerant while increasing the amount of the refrigerant flowing into the evaporator of the first indoor unit.

The overload determination may include a temperature sensor in each of the plurality of indoor units, and determine the overload based on the temperature of the indoor air detected by the temperature sensor.

Whether the overload is applied only to the first indoor unit is determined by: the overload state determined by the temperature of the indoor air detected by the temperature sensor installed in the first indoor unit lasts for a predetermined time or more and is detected by the temperature sensor installed in the second indoor unit. If the temperature of the air is not overloaded, it is determined that only the first indoor unit is overloaded, and the plurality of second indoor units are plural.

The increase in the amount of refrigerant flowing into the first evaporator is controlled by an expansion mechanism provided on the refrigerant inlet side of the first evaporator, and the expansion mechanism is an electronic expansion valve.

Increasing the compression capacity of the refrigerant comprises a plurality of compressors, and determines the compression capacity of the refrigerant according to the driving of the currently running compressor of the plurality of compressors, and selectively operating the compressors according to the determination result to compress the compression capacity of the refrigerant It is characterized by increasing the.

Hereinafter, with reference to the accompanying drawings will be described in detail the partial overload cancellation method of the air conditioner of the present invention.

1 is a view showing the configuration of an air conditioner to which the partial overload cancellation method of the present invention is applied. Here, reference numeral 100 denotes an accumulator for supplying low-temperature low-pressure gas refrigerant, and reference numerals 110 and 120 denote first and second compressors for converting low-temperature low-pressure gas refrigerant supplied by the accumulator 100 into high-temperature high-pressure gas refrigerant. .

For example, the first compressor 110 has a capacity of 60% of the total compression capacity, and the second compressor 120 has a capacity of 40%.

Reference numerals 112 and 122 denote non-return means for preventing backflow of the high-temperature, high-pressure gas refrigerant compressed by the first compressor 110 and the second compressor 120.

As the backflow preventing means 112 and 122, for example, a check valve may be used to prevent the backflow of the refrigerant.

Reference numeral 130 is a condenser. The condenser 130 compresses the gas refrigerant of high temperature and high pressure compressed by the first compressor 110 and the second compressor 120 into a liquid refrigerant of high temperature and high pressure.

Reference numerals 140a, 140b,... Are a plurality of inflation mechanisms. Each of the plurality of expansion mechanisms 140a, 140b,..., Expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser 130 to convert the low-temperature and low-pressure liquid refrigerant.

Reference numerals 150a, 150b,... Are a plurality of evaporators respectively installed in the indoor unit.

Each of the plurality of evaporators (150a, 150b, ...) is a low-temperature low pressure while generating a cold air by heat-exchanging the low-temperature low-pressure liquid refrigerant from each of the plurality of expansion mechanisms (140a, 140b, ...) with the indoor air Convert to gas refrigerant.

The air conditioner having such a configuration is a low-temperature low-pressure gas refrigerant stored in the accumulator 100 when the first and second compressors 110 and 120 are driven, the first and second compressors 110 and 120. It is introduced into the gas and compressed into a high-temperature, high-pressure gas refrigerant.

At this time, the accumulator 100 serves to prevent the low-temperature low-pressure liquid refrigerant from entering and damaging the first and second compressors 110 and 120.

The high temperature and high pressure gas refrigerant compressed by the first and second compressors 110 and 120 is introduced into the condenser 130 through the backflow prevention means 112 and 122.

The condenser 130 condenses the high temperature and high pressure gas refrigerant to be converted into a high temperature and high pressure liquid refrigerant, the high temperature and high pressure liquid refrigerant is expanded in each of the plurality of expansion mechanisms (140a, 140b, ...) Is converted into a liquid refrigerant.

The low temperature low pressure liquid refrigerant exchanges heat with indoor air in each of the plurality of evaporators (150a, 150b, ...) to evaporate into a low temperature low pressure gas refrigerant, and the cool air generated by the heat exchange is discharged to the room to cool.

The low-temperature low-pressure gas refrigerant evaporated in each of the plurality of evaporators 150a, 150b, ... is recovered by the accumulator 100, and the recovered low-temperature, low-pressure gas refrigerant is again the first and second compressors 110 ( In step 120), the gas is compressed to a high-temperature, high-pressure gas refrigerant and repeated.

2 is a control block diagram of an air conditioner to which the partial overload elimination method of the present invention is applied. Here, reference numeral 200 denotes a user input unit for inputting a user command such as an operation command or a control command of the air conditioner according to the user's operation, and reference numeral 210 denotes a temperature detector.

The temperature detector 210 is provided with a temperature sensor (not shown) such as a thermostat on each of the plurality of indoor units, and using a detection signal of the temperature sensor, Each room temperature is detected.

Reference numeral 220 is a control unit. The control unit 220 controls the operation of the air conditioner according to the user's command input through the user input unit 200.

In addition, the controller 220 determines a plurality of indoor temperatures detected by the temperature detector 210 and controls the operation of the air conditioner according to the determined indoor temperature.

In addition, the controller 220 may determine whether or not the specific indoor unit is overloaded by the temperature detection signal of the temperature detector 210, and effectively eliminate the overload of the specific indoor unit when the specific indoor unit is overloaded. To control the operation of the air conditioner.

Reference numeral 230 denotes a compressor drive unit. The compressor driver 230 drives the first compressor 110 and the second compressor 120 under the control of the controller 220.

Reference numeral 240 denotes an expansion mechanism driver. The expansion mechanism driver 240 controls the expansion amount of the refrigerant by driving the plurality of expansion mechanisms 140a, 140b,..., Under the control of the controller 220.

In the air conditioner having such a configuration, when a user manipulates the user input unit 200 and an operation command of the air conditioner is input, the controller 220 controls the compressor driver 230 according to the operation command of the air conditioner. The first and second compressors 110 and 120 are driven, and the expansion mechanism driving unit 240 is controlled to adjust the opening and closing amounts of the plurality of expansion mechanisms 140a, 140b,...

The controller 220 determines whether the specific indoor unit is overloaded by using the temperature of each room where the indoor unit is installed as the output signal of the temperature detector 210. Here, it is assumed that the first indoor unit in which the evaporator 150a is installed is overloaded.

As a result of the determination, when the first indoor unit in which the evaporator 150a is installed is overloaded, the controller 220 determines whether the overload applied to the first indoor unit lasts for more than a preset time, and the overload is greater than the preset time. If it continues, determine if the other indoor unit is overloaded.

As a result of the determination, when the specific indoor unit is not overloaded, or when the overload is not continued for more than a set time even when the overload is applied, or when the other indoor unit other than the specific indoor unit is overloaded, the controller 220 is overloaded. The temperature detector 210 normally controls the operation of the air conditioner according to the indoor temperature of each indoor unit detected.

As a result of the determination, when the first indoor unit, which is a specific indoor unit, is overloaded for a predetermined time or more, and when the second indoor unit, which is other indoor units, is not overloaded, the controller 220 determines that the second indoor unit is a part overloaded. Determine the operating state of the compressor.

As a result of the determination, when the compressor is currently operating at 100%, the control unit 220 controls the expansion mechanism driving unit 240 and the refrigerant flowing into the evaporator 150a of the first indoor unit that is overloaded through the expansion mechanism 140a. To increase the amount.

As a result of the determination, when the compressor is not operated at 100%, the control unit 220 controls the compressor driving unit 230 to increase the compression capacity of the refrigerant. That is, when the controller 220 is driving only the second compressor 120 having a compression capacity of 40%, the second compressor 120 is stopped and the first compressor having a compression capacity of 60% ( When the 110 is driven to increase the compression capacity of the refrigerant, and when only the first compressor 120 having a compression capacity of 60% is driven, the refrigerant is driven by driving both the first and second compressors 110 and 120. Increase the compressive capacity to 100%.

After increasing the refrigerant compression capacity of the compressor, the controller 220 controls the expansion mechanism driver 240 to control the amount of refrigerant flowing into the first evaporator 150a of the first indoor unit through the expansion mechanism 140a. To increase.

In such a state, the controller 220 determines whether the overload of the first indoor unit is released by the room temperature of the first indoor unit detected by the temperature detector 210, and when the overload is not resolved, the first evaporator ( The operation of determining whether the overload has been eliminated is repeatedly performed while increasing the amount of the refrigerant flowing into 150a).

When the overload of the first indoor unit is eliminated, the control unit 220 releases the partial overload operation, and controls the operation of the air conditioner normally according to the indoor temperature of each indoor unit detected by the temperature detector 210.

On the other hand, Figure 3 is a signal flow diagram showing a partial overload cancellation method of the present invention. As shown in the drawing, when the user manipulates the user input unit 200 to input an operation command of the air conditioner (S300), the controller 220 starts the operation of the air conditioner (S302). That is, the controller 220 controls the compressor driver 230 to drive the first and second compressors 110 and 120 according to the operation command of the air conditioner, and controls the expansion mechanism driver 240 to control the plurality of compressors. The cooling operation is performed by adjusting the opening / closing amount of the expansion mechanisms 140a, 140b,...

The controller 220 determines the temperature of each room where the indoor unit is installed as the output signal of the temperature detector 210 (S304), and determines whether or not the specific indoor unit is overloaded (S306). Here, it is assumed that the first indoor unit in which the evaporator 150a is installed is overloaded.

When the overload is applied to the first indoor unit as a result of the determination, the controller 220 determines whether the overload applied to the first indoor unit lasts for a predetermined time or more (S308).

When the overload continues for a predetermined time as a result of the determination, the control unit 220 determines whether or not the other indoor unit is also overloaded (S310). That is, the controller 220 determines whether the second indoor unit in which the evaporators 150b,... Are installed in addition to the first indoor unit is overloaded.

As a result of the determination, if the specific indoor unit is not overloaded, or the overload is not continued for more than a set time even if the overload is applied, or if the other indoor unit is overloaded other than the specific indoor unit, the controller 220 determines the overall overload operation, and the temperature detection unit The operation of the air conditioner is normally controlled according to the indoor temperature of each indoor unit detected by the 210 (S324).

In addition, when the determination result is that the first indoor unit, which is a specific indoor unit, is overloaded for a predetermined time or more, and when the second indoor unit, which is other indoor units, is not overloaded, the controller 220 determines that it is a partial overload operation for the second indoor unit (S312). ).

Next, the controller 220 determines whether the compressor is currently operating at 100% (S314). That is, the controller 220 currently controls the compressor driver 230 to have a first compressor 110 having a compression capacity of 60% of the total compression capacity, and a second compressor having a 40% compression capacity of the total compression capacity. It is determined whether all the compressors 120 are driven.

As a result of the determination, when the compressor is currently operating at 100%, the controller 220 increases the amount of the refrigerant flowing into the evaporator 150a of the first indoor unit that is overloaded (S316). That is, the controller 220 controls the expansion mechanism driver 240 to increase the amount of refrigerant flowing into the evaporator 150a through the expansion mechanism 140a.

When the compressor is not operated at 100% as a result of the determination, the control unit 220 controls the compressor driving unit 230 to increase the compression capacity of the refrigerant (S318).

That is, when the controller 220 is driving only the second compressor 120 having a compression capacity of 40%, the second compressor 120 is stopped and the first compressor having a compression capacity of 60% ( When the 110 is driven to increase the compression capacity of the refrigerant, and when only the first compressor 120 having a compression capacity of 60% is driven, the refrigerant is driven by driving both the first and second compressors 110 and 120. Increase the compressive capacity to 100%.

After increasing the refrigerant compression capacity of the compressor, the controller 220 controls the expansion mechanism driver 240 to control the amount of refrigerant flowing into the first evaporator 150a of the first indoor unit through the expansion mechanism 140a. Increase (S320).

In this state, the controller 220 determines whether or not the overload of the first indoor unit is resolved at the indoor temperature of the first indoor unit detected by the temperature detector 210 (S322).

When the overload is not resolved as a result of the determination, the control unit 220 returns to step S314 to increase the amount of refrigerant flowing into the first evaporator 150a and determine whether the overload has been resolved. Repeat it.

When the overload of the first indoor unit is resolved as a result of the determination in step S322, the control unit 220 cancels the partial overload operation, and the air is normally aired according to the indoor temperature of each indoor unit detected by the temperature detection unit 210. The operation of the conditioner is controlled (S324).

On the other hand, while the present invention has been shown and described with respect to specific preferred embodiments, various modifications and changes of the present invention without departing from the spirit or field of the invention provided by the claims below It can be easily understood by those skilled in the art.

As described in detail above, the present invention detects the temperature of the indoor air by using a temperature sensor installed in each indoor unit, accurately detects whether the cooling load is increased in the specific indoor unit by the detected indoor air temperature, and the specific indoor unit. If only the cooling load is detected to increase, the amount of refrigerant flowing into the evaporator of that particular indoor unit is increased.

In addition, when a plurality of compressors are provided, the amount of refrigerant flowing into the evaporator of a particular indoor unit is increased while the refrigerant compression capacity of the compressor is also increased, thereby cooling the cooling capacity of other indoor units in which the cooling load is kept constant. By increasing only the amount of refrigerant flowing into a specific indoor unit with an increased load, it is possible to cool the room at a high speed.

Claims (8)

A plurality of electromagnetic expansion valves respectively expanding the refrigerant supplied from the outdoor unit and supplying the refrigerant to the plurality of indoor units; A plurality of supply pipe temperature detectors for detecting a temperature of the supply pipe with a temperature sensor installed in the supply pipe for supplying refrigerant to the plurality of indoor units from the plurality of electromagnetic expansion valves; A plurality of recovery pipe temperature detectors detecting a temperature of the recovery pipe by a temperature sensor installed in the recovery pipe in which the refrigerant is respectively recovered from the plurality of indoor units; A plurality of electromagnetic expansion valve driving units respectively controlling opening and closing amounts of the plurality of electromagnetic expansion valves; A plurality of indoor temperature detectors configured to install a temperature sensor on each of the plurality of indoor units to detect an indoor temperature of a room where the plurality of indoor units are located; And Compute a temperature difference between a plurality of supply piping temperatures detected by the plurality of supply pipe temperature detectors and a plurality of recovery piping temperatures detected by the plurality of recovery piping temperature detectors, respectively, and compare the preset temperature differences. Controlling the plurality of electromagnetic expansion valve driving units according to the control of the plurality of electromagnetic expansion valves, and determining the operation of the compressor according to the indoor temperatures detected by the plurality of indoor temperature detection units, respectively, and operating the determined compressor. The control apparatus of the refrigerant distributor in the multi-type air conditioner including a refrigerant supply control unit for controlling the outdoor unit control unit to operate the compressor according to. delete 3. The method of claim 1 or 2, wherein the overload determination; A temperature sensor is provided in each of the plurality of indoor units, and the overload is resolved according to the temperature of the indoor air detected by the temperature sensor. The method according to claim 1 or 2, wherein whether to overload only the first indoor unit is determined; If the overload condition determined by the temperature of the indoor air detected by the temperature sensor installed in the first indoor unit lasts more than a set time, and the temperature of the indoor air detected by the temperature sensor installed in the second indoor unit is not overloaded, only the first indoor unit is overloaded. Partial overload of the air conditioner, characterized in that judged that the jam. According to claim 4, The second indoor unit; Partial overload cancellation method of the air conditioner, characterized in that a plurality. The method according to claim 1 or 2, wherein an increase in the amount of refrigerant flowing into the first evaporator; Partial overload of the air conditioner, characterized in that for controlling by the expansion mechanism provided on the refrigerant inlet side of the first evaporator. According to claim 6, The expansion mechanism; Partial overload of the air conditioner, characterized in that the electromagnetic expansion valve. The method of claim 2, wherein the increase in the compression capacity of the refrigerant; A plurality of compressors are provided, and among the plurality of compressors, the compression capacity of the refrigerant according to the driving of the currently driven compressor is determined, and the compressors are selectively driven according to the determination result to increase the compression capacity of the refrigerant. How to eliminate partial overload of air conditioner.

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