KR20000055119A - method for control outdoor fan of multi-air conditioner - Google Patents

Abstract

PURPOSE: A method for controlling an outdoor fan of a multi-type air conditioner is provided to control a cooling temperature in detail by controlling flow toward an outdoor heat exchanger in several steps by increasing or decreasing rotation velocities of two outdoor fans. CONSTITUTION: A method for controlling an outdoor fan of a multi-type air conditioner having first and second cooling systems respectively operated by independent cooling cycle, includes the steps of operating first and second outdoor fans of the first and second cooling systems according to an ambient temperature as the operation of the air conditioner is begun, detecting whether either the first or second cooling system is operation in combination or individually under the state that the first and second outdoor fans are operating, controlling rotation velocities of the fans according to the ambient temperature in case of combination operation, while detecting a pyong(=3.954 sq. yds.) of a room to be cooled in case of an individual operation, and re-controlling the rotation velocities of the fans according to a temperature of a compressor inlet, a refrigerant discharging pressure of the compressor, and the ambient temperature after dividing the detected pyong into a smaller pyong, middle pyong or a larger pyong according to a predetermined data value.

Description

Method for control outdoor fan of multi-type air conditioner

The present invention relates to a multi-type air conditioner, and more particularly, to a method for controlling an outdoor fan of a multi-type air conditioner to control a pair of outdoor fans in association with changes in outdoor temperature.

In general, an air conditioner refers to a cooling / heating system that cools a room by a repetitive action of sucking heat in a room, heat-exchanging it with a cold air, and then discharging it into the room, or heating the room by a reverse action.

In addition, it functions as an air purifying function that sucks and contaminates indoor contaminated air and makes it into clean air, and re-enters it into the room, and a dehumidifying function that sucks humid air into dry and dry air and reintroduces it into the room. .

Air conditioners that have these functions are available in various types of air conditioners to be installed according to the installation conditions and the volume of the interior space. It is divided into a separate air conditioner connected by 1, and a multi-type air conditioner connected to a plurality of indoor units by one outdoor unit.

In particular, as described above, the multi-type air conditioner can have the same effect as installing a plurality of separate air conditioners by connecting a plurality of indoor units to a single outdoor unit, in particular, when installing two or more air conditioners in a home. It can be applied effectively when you want to install an air conditioner in each office in the office.

1 is a configuration diagram showing an example of such a multi-type air conditioner, which comprises a first cooling cycle connecting an outdoor unit and an indoor unit 1: 3, and a second cooling cycle connecting the outdoor unit and the indoor unit 1: 3. Yes.

The first and second cooling cycles are respectively cooled in accordance with conditions such as indoor / outdoor temperature and compressor temperature.

Among them, the first cooling cycle includes a first compressor (1) for compressing the refrigerant at a high temperature / high pressure, and a first outdoor heat exchanger for condensing the gas refrigerant transferred from the first compressor to a high pressure liquid refrigerant. (Or condenser) (2), three first electromagnetic expansion valve (3) for depressurizing the liquid refrigerant transferred from the first outdoor side heat exchanger to low temperature / low pressure, and conveyed from the first electromagnetic expansion valve Three first indoor heat exchangers (or evaporators) 4 for evaporating the liquid refrigerant at a low temperature / low pressure, and a first outdoor fan 5 for forcibly cooling the first indoor heat exchangers. have.

A first pressure sensor 7 is installed between the first compressor 1 and the first outdoor side heat exchanger 2 to sense the pressure in the refrigerant tube 6. Between the machine 2 and the first electromagnetic expansion valve 3, a first receiver 8 for adjusting the amount of refrigerant flow into each of the first electromagnetic expansion valves is provided. A first heating valve 9 is installed to improve the compression temperature by connecting a part of the refrigerant discharged from the first compressor by a pipe to the in / out side and increasing the temperature after being introduced to the first compressor. And a tube connected between the in side of the first compressor 1 and the first receiver 8 and the first electromagnetic expansion valve 3 so that the temperature of the first compressor 1 is higher than the set value. When the refrigerant in the liquid state passing through the first receiver (8) to the first compressor (1) by the heat of compression First cooling valve 10 by giving each may be installed.

On the other hand, since the second cooling cycle has the same configuration as the first cooling cycle described above, a separate configuration description will be omitted.

However, in order to distinguish it from the components of the first cooling cycle, each component will be referred to as "second to second" (for example, "second outdoor fan").

The first cooling cycle configured as described above is operated as follows (the second cooling cycle is also the same).

The refrigerant heated up at a high temperature / high pressure in the first compressor 1 moves to the first outdoor side heat exchanger 2 along the refrigerant pipe 6, and at this time, the gas that is hot in the first outdoor side heat exchanger The refrigerant is brought into a high pressure liquid state by lowering the refrigerant close to the atmospheric temperature by natural heat exchange with the atmosphere and forced heat exchange by the blowing force of the first outdoor fan 5.

The high-pressure liquid refrigerant passing through the first outdoor side heat exchanger 2 passes through the first receiver 8, and the amount of refrigerant is added and subtracted according to the number of connections of the first indoor side heat exchanger 4. The refrigerant is reduced in temperature / decompression at low temperature / low pressure through each of the first electromagnetic expansion valves 3 and flows into each of the first indoor side heat exchangers 4.

The refrigerant introduced into each of the first indoor side heat exchangers 4 is evaporated to a low temperature / low pressure state to take heat of external air to cool the room.

When the compression temperature of the first compressor (1) is lower than the set temperature in the process of the first cooling cycle is carried out to increase the temperature by allowing a portion of the refrigerant discharged from the first compressor flows into the first heating valve (9) As it flows back into the first compressor 1, the compression temperature of the first compressor is further increased. When the compression temperature of the first compressor 1 is higher than the set temperature, the first receiver 8 passes through the first receiver 8. The relatively low temperature liquid refrigerant is introduced into the first compressor 1 by the first cooling valve 10 so as to prevent overheating of the first compressor.

Meanwhile, the outdoor temperature is measured as one of conditions for automatically adjusting the cooling temperature. For this purpose, the outdoor temperature is sensed in the outdoor unit case 12 in which the first and second outdoor side heat exchangers 2 and 2a are embedded. The sensor 11 is provided.

The temperature data measured by the outdoor temperature sensor 11 is data shared by the first and second outdoor heat exchangers 2 and 2a, and the first and second cooling cycles are performed by the data. Cooling temperature is also adjusted automatically.

In other words, if the outdoor temperature is measured to be high, the indoor temperature will be cool when the indoor temperature is relatively low. On the contrary, if the outdoor temperature is measured to be relatively low, the indoor temperature is automatically adjusted to a temperature that is not too low. Let's keep it.

To this end, when the outdoor temperature sensed by the outdoor temperature sensor 11 is a hot temperature zone, the first and second outdoor fans 5 and 5a are simultaneously rotated and the first and second outdoor heat exchangers 2 ( Increasing the amount of heat dissipation in 2a) improves the cooling power. On the contrary, if the temperature detected by the outdoor temperature sensor 11 is not very hot, the first and second outdoor fans 5 and 5a may be replaced. At the same time, as the amount of heat dissipation in the first and second outdoor side heat exchangers (2) (2a) is reduced, the cooling power is adjusted downward so as to maintain a comfortable indoor temperature at all times.

In addition, depending on the temperature of the first and second compressors 1 and 1a and the pressure in the first and second refrigerant pipes 6 and 6a, the blowing amount (rotational speed) of the first and second outdoor fans 5 and 5a is determined. In order to adjust the indoor temperature by adjusting, the air blowing amount of the first and second outdoor fans 5 and 5a may vary.

As described above, since the first and second outdoor fans 5 and 5a are operated separately according to their respective cycles, the heat dissipation amount of the first and second outdoor side heat exchangers 2 and 2a is controlled by the first and second outdoor fans. Since it was possible only by the blowing force of the fans 5 and 5a, the tuning range of the heat dissipation amount was limited to the air volume of each of the first and second outdoor fans.

In addition, since the first and second outdoor side heat exchangers 2 and 2a and the single outdoor unit case 12 are installed, the first outdoor fan 5 influences the heat dissipation amount of the second outdoor side heat exchanger 2a. In this case, since it is not a control operation according to the condition of the outdoor temperature, it has a negative effect, which has been a factor that makes the cooling operation unstable.

The present invention has been made to solve the above-mentioned conventional problems, the object is to be controlled in conjunction with a plurality of outdoor fans in accordance with the change in outdoor temperature.

The present invention for achieving the above object is a multi-type air conditioner having a first and a second cooling system which are operated by independent cooling cycles;

Starting operation and rotating the first and second outdoor fans of the first and second cooling systems according to the outdoor temperature;

Detecting whether the cooling system is a combined operation or a single operation among the first and second cooling systems while the first and second outdoor fans are operated;

If the detection result is a combined operation, the rotational speed of the first and second outdoor fans is adjusted according to the change of the outdoor temperature, and if the operation is a single operation, detecting the operation average at that time;

The sensed operation is divided into small equilibrium, medium equilibrium and large equilibrium based on the set data value, and the rotational speed of the first and second outdoor fans according to the compressor inlet temperature, the refrigerant discharge pressure of the compressor, and the outdoor temperature. The present invention provides a method for controlling an outdoor fan of a multi-type air conditioner, wherein the step of re-adjusting is performed sequentially.

1 is a block diagram of a multi-type air conditioner

2 is a flow chart for the first and second outdoor fan control of the present invention

3A is a flow chart for controlling the first and second outdoor fans in small balanced single operation.

Figure 3b is a flow chart for the first and second outdoor fan control in the middle balance alone operation

3C is a flow chart for controlling the first and second outdoor fans in large balanced single operation.

3D is a flowchart for controlling first and second outdoor fans during combined operation

Explanation of symbols for main parts of the drawings

1, 1a: 1st, 2nd compressor 4: 1st outdoor heat exchanger

5, 5a: 1st, 2nd outdoor fan

2 is a flow chart for the first and second outdoor fan control of the present invention, Figure 3a is a flow chart for the first and second outdoor fan control in small balanced single operation, Figure 3b 3 is a flow chart for the first and second outdoor fan control, Figure 3c is a flow chart for the first and second outdoor fan control in large balanced single operation, Figure 3d is a flow chart for the first and second outdoor fan control in the combined operation As a flow chart for describing the outdoor fan control method of the present invention multi-type air conditioner with reference to these accompanying drawings in detail as follows.

The present invention relates to a multi-type air conditioner having first and second cooling systems each operated by independent cooling cycles;

When the first and second air conditioning systems are operated, the first and second outdoor fans 5 and 5a are rotated by respective independent cooling cycles, and the first and second outdoor fans 5 and 5a are operated. Detecting whether any one of the first and second cooling systems is a combined operation in which several indoor units are operated or a Taiwan is operated alone in a state in which the first and second cooling systems are operated; Adjusting the rotational speed of the outdoor fan (5) (5a) appropriately to the outdoor temperature, and if it is a stand-alone operation, detecting the operation scale of the indoor unit to be operated at that time, the detected operation scale is a small balance, medium balance or large In this case, the steps of adjusting the rotational speeds of the first and second outdoor fans 5 and 5a are sequentially performed according to the equilibrium and the compressor inlet temperature at that time, the refrigerant discharge pressure of the compressor, and the outdoor temperature. .

An embodiment of controlling the wind speed of the first and second outdoor fans 5 and 5a according to the sensing condition as described above will be described based on the appropriate data.

In this case, it is noted that the data is calculated through repetitive experimental results.

First, when the first cooling system is operated at 5 pyeong and the second cooling system is in a stopped state, when the sensed outdoor temperature at this time is higher than 41 ° C., which is a high temperature region, the first outdoor fan 5 is rotated by strong wind. By increasing the heat dissipation efficiency of the first outdoor heat exchanger (4) to improve the cooling capacity of the first cooling system.

If the outdoor temperature is in the range of 33 ° C. to 41 ° C., which is an intermediate set temperature range, the first outdoor fan 5 is rotated in a mild wind, thereby lowering the level of heat dissipation efficiency than when the outdoor temperature is high. Allow the ability to adjust.

When the outdoor temperature is lower than the intermediate set temperature of 33 ° C., since the external temperature is not so high, only the second outdoor fan 5a is strongly rotated to adjust the cooling capacity of the first cooling system according to the temperature band.

As such, the amount of blowing air transmitted to the first outdoor heat exchanger 4 based on the first outdoor fan strong wind> first outdoor fan weak wind> first outdoor fan strong wind> first outdoor fan weak wind is the first air cooling system. When the outdoor temperature of the temperature decreases, the airflow to the outdoor heat exchanger can be finely adjusted by rotating only the outdoor fan of the second cooling system while the outdoor fan of the first cooling system is stopped.

On the other hand, when the first cooling system is operated at 7 pyeong and the second cooling system is in a stopped state, if the sensed outdoor temperature at this time is higher than 37 ° C., which is a high temperature region, only the first outdoor fan 5 is driven by a strong wind. By rotating, the heat dissipation efficiency of the first outdoor heat exchanger 4 is increased to improve the cooling capacity of the first cooling system.

When the outdoor temperature is within the set temperature range of 36 to 37 ° C., the first outdoor fan 5 maintains the amount of heat dissipated by maintaining the amount of air flow before that, while the relatively low temperature at which the outdoor temperature is below the set temperature range is maintained. When the first outdoor fan 5 is operated in a mild wind, the amount of heat dissipation in the first outdoor heat exchanger 4 is reduced from the previous step, thereby suppressing the increase in the cooling capacity of the room.

At this time, if the inlet temperature of the first compressor 1 is kept below 0 ° C. for about 1 minute, it means a supercooled state. In this case, only the second outdoor fan 5a is controlled by strong wind so that the first outdoor heat exchanger ( 4) The amount of air to the furnace was appropriately reduced to suppress the progress of subcooling.

At this time, if the first outdoor fan 5 is driven instead of the second outdoor fan 5a, the heat dissipation amount of the first outdoor heat exchanger 4 is increased, resulting in an improvement in the cooling power of the first refrigeration system. This results in promoting supercooling.

On the other hand, when the first cooling system is operated at 15 pyeong and the second cooling system is in a stopped state, when the outdoor temperature is higher than 34 ° C., which is the set temperature, only the first outdoor fan 5 is strong because the external air temperature is high. By increasing the amount of heat dissipation by rotating to increase the heat exchange efficiency.

In addition, when the outdoor temperature is in the range of 32 to 34 ° C., which is the set temperature band, the first outdoor fan 5 maintains the amount of heat dissipation by maintaining the air volume before that, while the outdoor temperature is relatively low when the outdoor temperature is below the set temperature band. As only the first outdoor fan 5 is operated in a mild wind, the amount of heat dissipation in the first outdoor heat exchanger 4 is reduced than in the previous step, thereby suppressing an increase in the cooling capacity of the room.

On the other hand, in a combined operation in which two or more indoor units are operated, if the outdoor temperature is higher than the set temperature of 33 ° C., the second compressor 1a of the second cooling system is detected to be turned on or off. When the compressor 1a is turned off, the first and second outdoor fans 5 and 5a are strongly rotated to improve cooling efficiency. When the compressor 1a is lower than the set temperature or when the second compressor 1a is turned on, the first outdoor fan 5 is turned on. ) Was forced to rotate strongly.

The present invention as described above has the effect that the cooling temperature can be more finely adjusted by adjusting the two outdoor fan rotational speed in accordance with the outdoor temperature in several stages of the air volume blown to the outdoor side heat exchanger.

In addition, since the stage can be adjusted to four or more stages based on one outdoor side heat exchanger, the system can be stabilized by finely adjusting the pressure in the refrigerant pipe.

Claims (5)

A multi-type air conditioner having first and second cooling systems, each of which is operated by independent cooling cycles; Starting operation and rotating the first and second outdoor fans of the first and second cooling systems according to the outdoor temperature; Detecting whether the cooling system is a combined operation or a single operation among the first and second cooling systems while the first and second outdoor fans are operated; If the detection result is a combined operation, the rotational speed of the first and second outdoor fans is adjusted according to the change of the outdoor temperature, and if the operation is a single operation, detecting the operation average at that time; The sensed operation is divided into small equilibrium, medium equilibrium and large equilibrium based on the set data value, and the rotational speed of the first and second outdoor fans according to the compressor inlet temperature, the refrigerant discharge pressure of the compressor, and the outdoor temperature. The method of controlling the outdoor fan of the multi-type air conditioner, characterized in that the step of re-adjusting sequentially. The method of claim 1, In single equilibrium operation, If the outdoor temperature is higher than the maximum set temperature, only the first outdoor fan is strongly rotated, If the outdoor temperature is within the middle set temperature range, the first outdoor fan is rotated slightly. If the outdoor temperature is within the minimum set temperature range, only the second outdoor fan is rotated strongly. If the outdoor temperature is lower than the minimum set temperature, only the second outdoor fan is rotated slightly, characterized in that the outdoor fan control method of the multi-type air conditioner. In single operation of intermediate balance, If the outdoor temperature is higher than the set temperature while the first and second outdoor fans are operating, only the first outdoor fan is strongly rotated, If the outdoor temperature is the set temperature range, the first outdoor fan maintains the previous rotation speed. If the outdoor temperature is less than the set temperature range, only the first outdoor fan rotates slightly. When the outdoor temperature is higher than the set temperature and the inlet temperature of the compressor is lower than the set temperature during the set time, the second outdoor fan is rotated strongly, and when the outdoor temperature is lower than the set temperature, the second outdoor fan is turned off. Outdoor fan control method of a multi-type air conditioner, characterized in that. The method of claim 1, When driving large equilibrium alone, If the outdoor temperature is higher than the set temperature, only the first outdoor fan is strongly rotated, If the outdoor temperature is the set temperature band, the first outdoor fan maintains the previous rotational speed, and if the outdoor temperature is less than the set temperature band, only the first outdoor fan is weakly rotated, the outdoor fan control method of the multi-type air conditioner. In combination operation, If the outdoor temperature is higher than the set temperature, it detects whether the second compressor of the second cooling system is on or off. If the second compressor is off, the first and second outdoor fans are strongly rotated. The method of controlling the outdoor fan of the multi-type air conditioner according to claim 1, wherein only the first outdoor fan is strongly rotated when the set temperature is lower or the second compressor is turned on.