KR19990071303A - Drive control method of cooling system - Google Patents

Abstract

The present invention relates to a drive control method of a cooling system, comprising: a cooling system in which a plurality of evaporators are provided in each cooling chamber by receiving a refrigerant circulated by a compressor and generating cold air, wherein the set temperature is set for each cooling chamber. Is inputted and an operation start command is inputted, the refrigerant circulated by the compressor is supplied to the plurality of evaporators one at a time while the compressor is started at an operation frequency suitable for initial startup, and the respective cooling chambers are cooled. Refrigerant is supplied to all of the plurality of evaporators to compare the present temperature of each cooling chamber with the set temperature of each cooling chamber and drive the compressor by adjusting the operation frequency according to the comparison result. Compared to the conventional cooling system that circulates a large amount of refrigerant to supply all at once Sikimyeo refrigerant circulation amount is minimized, so the compressor is smaller and because of this reduction in noise and power consumption caused when the compressor is driven, to one so as to reduce the manufacturing costs.

Description

Drive control method of cooling system

The present invention relates to a cooling system in which a refrigerant circulated by a compressor is supplied to a plurality of evaporators. More particularly, the present invention relates to a cooling system capable of miniaturizing a compressor by sequentially supplying refrigerant to a plurality of evaporators at initial startup. It relates to a drive control method.

In general, a cooling system used for kimchi storage, vending machines, showcases, and independent cooling refrigerators includes a plurality of refrigerants circulated through one compressor and installed in each cooling chamber by the refrigerant circulated by the compressor. Cold air is generated in the evaporator of the.

The above-described cooling system includes a compressor for compressing and discharging a refrigerant gas at a high temperature and high pressure, a condenser for condensing the high temperature and high pressure refrigerant discharged from the compressor with a liquid refrigerant at a high pressure room temperature, and a high pressure room temperature condensed at the condenser. A capillary tube for reducing the refrigerant to a low pressure, and a plurality of evaporators for heat-exchanging the air for each cooling chamber with cold air by using the latent heat of evaporation generated by vaporizing the refrigerant decompressed through the capillary tube.

And a key input unit for inputting a set temperature for each cooling chamber, a plurality of evaporator temperature sensors for sensing temperatures for the plurality of evaporators installed in each cooling chamber, and the key input unit. A control unit for determining an operating frequency of the compressor according to a set temperature for each cooling chamber and a temperature for each of the plurality of evaporators sensed by the plurality of evaporator temperature sensors, and according to the operating frequency determined by the control unit. A compressor drive unit for driving the compressor is provided.

The operation process of the cooling device configured as described above is as follows.

When the user inputs the set temperature for each cooling chamber through the key input unit, and then operates the operation start button, the control unit determines the operating frequency suitable for the initial start of the compressor and outputs a control signal corresponding thereto.

The compressor is started at an operating frequency suitable for the initial start by the compressor driver driven in accordance with a control signal applied from the controller.

As the compressor is started, the refrigerant gas is compressed to the compressor at high temperature and high pressure, and then condensed into the liquid refrigerant of high pressure and room temperature in the condenser. The air inherent in each cooling chamber is heat-exchanged with cold air through the plurality of evaporators while being vaporized.

Thereafter, when the temperatures of the plurality of evaporators detected by the plurality of evaporator temperature sensors become a value corresponding to the temperature for each of the cooling chambers set through the key input unit, it is normal at an operating frequency suitable for initial startup of the compressor. The operating frequency is switched to the operating state.

That is, a control signal of an operating frequency corresponding to a comparison value between the plurality of evaporator temperatures detected by the plurality of evaporator temperature sensors and the temperature of each cooling chamber input through the key input unit is output from the controller, The control signal output from the control unit is applied to the compressor driving unit to drive the compressor at an operating frequency corresponding to the control signal.

Here, since the temperatures inside the plurality of cooling chambers are at room temperature during the initial startup of the cooling system, the compressor is driven at a relatively high speed so as to cool the temperatures inside the plurality of cooling chambers to a set temperature within a short time. After circulating in a large amount, when the temperature of each of the plurality of cooling chambers is above a certain temperature, the compressor is driven at a relatively low speed to circulate a small amount of refrigerant to maintain each cooling chamber temperature at a set temperature.

However, as described above, the conventional cooling system is designed to start a plurality of evaporators at the time of initial start-up, and for this purpose, a large amount of refrigerant is circulated at the time of initial start. By using a compressor having a very large capacity, there is a problem in that noise is greatly generated when the compressor is driven, power consumption is increased and manufacturing costs are increased.

Accordingly, the present invention has been made to solve the above problems, by supplying the refrigerant to the plurality of evaporators one at a time during the initial startup of the cooling system, thereby reducing the capacity of the compressor to reduce noise and power consumption The purpose of the present invention is to provide a drive control method of a cooling system that can reduce manufacturing costs.

The drive control method of the cooling system according to the present invention for achieving the above object is a cooling system in which each of the cooling system provided with a refrigerant circulated by the compressor to generate cold air is provided in each of the plurality of cooling chambers, the respective cooling A temperature setting step for setting the temperature of the chamber, a compressor start step for starting the compressor at an operation frequency suitable for initial start-up when an operation start command is input, and each cooling chamber set in the temperature of each cooling chamber and the temperature setting step A cooling step of supplying the refrigerant circulated by the compressor starting step one at a time to the evaporators installed in the respective cooling chambers, and supplying the refrigerant to all of the plurality of evaporators when the cooling step is completed. Compare the present temperature of each cooling chamber with the temperature of each cooling chamber set in said temperature setting step, and compare It characterized in that it is composed of a temperature maintenance step of operating the compressor by adjusting the operating frequency accordingly.

1 is a schematic block diagram of hardware for carrying out the present invention;

2 is a schematic block diagram of a drive control device for controlling the drive of the hardware shown in FIG.

FIG. 3 is a flowchart for describing an operation process of the controller illustrated in FIG. 2.

<Explanation of symbols for the main parts of the drawings>

10: compressor 30, 31: solenoid valve

50, 51: evaporator 120, 121: temperature sensor

130: control unit

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

1 is a schematic block diagram of hardware for carrying out the present invention. The hardware for carrying out the present invention includes a compressor 10, a condenser 20, a first solenoid valve 30, and a second. The solenoid valve 31, the 1st capillary tube 40, the 2nd capillary tube 41, the 1st evaporator 50, and the 2nd evaporator 51 are comprised.

In FIG. 1, the compressor 10 compresses and discharges a refrigerant gas at high temperature and high pressure, and the condenser 20 condenses the refrigerant compressed at high temperature and high pressure through the compressor 10 into a liquid refrigerant at high pressure and room temperature. It is.

In addition, the first solenoid valve 30 is configured to selectively supply the liquid refrigerant condensed in the condenser 20 to the first capillary tube 40, and the second solenoid valve 31 is provided at the condenser 20. The condensed liquid refrigerant is selectively supplied to the second capillary tube 41.

In addition, the first capillary tube 40 is configured to reduce the liquid refrigerant supplied from the condenser 20 through the first solenoid valve 30 to a low pressure, and the second capillary tube 41 is the condenser 20. It is to reduce the liquid refrigerant supplied through the second solenoid valve 31 from the low pressure.

In addition, the first evaporator 50 is installed in the first cooling chamber ROOM1 and vaporizes the refrigerant decompressed in the first capillary tube 40 to heat-exchange the air in the first cooling chamber ROOM1 with cold air. The second evaporator 51 is installed in the second cooling chamber ROOM2 and vaporizes the refrigerant decompressed in the second capillary tube 41 to heat-exchange the air in the second cooling chamber ROOM2 with cold air. have.

As shown in FIG. 2, the driving control apparatus for controlling the driving of the hardware configured as described above includes a key input unit 110, a first temperature sensor 120, a second temperature sensor 121, The controller 130, the compressor driver 140, the first solenoid valve driver 150, and the second solenoid valve driver 151 are provided.

In FIG. 2, the key input unit 110 includes a plurality of selection buttons for inputting set temperatures of the first cooling chamber ROOM1 and the second cooling chamber ROOM2 and an operation start button for instructing operation start. And converts the button operation of the user into a corresponding key signal and then applies it to the control unit 130.

In addition, the first temperature sensor 120 detects the temperature of the first cooling chamber ROOM1 and applies a temperature signal corresponding thereto to the controller 130, and the second temperature sensor 121 is the second cooling chamber. The temperature of ROOM2 is sensed and a corresponding temperature signal is applied to the controller 130.

In addition, the controller 130 may operate according to a key signal applied from the key input unit 110 and a temperature signal applied from the first temperature sensor 120 and the second temperature sensor 121. The control unit outputs a driving frequency signal corresponding to the determined driving frequency while outputting a valve driving signal for selectively opening and closing the first solenoid valve 30 and the third solenoid valve 31.

In addition, the compressor driver 140 is configured to drive the compressor 10 at an operating frequency corresponding to the operating frequency signal applied from the controller 130.

In addition, the first solenoid valve driver 150 opens and closes the first solenoid valve 30 according to a valve driving signal applied from the controller 130, and the second solenoid valve driver 151 is the controller 130. The second solenoid valve 31 is opened and closed in response to a valve driving signal applied from the valve.

An operation example of the present invention configured as described above will be described in detail with reference to FIGS. 1 to 3.

When power is supplied to the inside of the cooling system in the initial state, the control unit 130 is initialized (S10).

At this time, when the user inputs the set temperatures of the first cooling chamber ROOM1 and the second cooling chamber ROOM1 by operating the temperature setting button of the key input unit 110, the corresponding key signal is controlled from the key input unit 110. It is applied to 130 (S20).

As described above, when a key signal is input from the key input unit 110, the controller 130 determines whether a key signal indicating operation start is input from the key input unit 110 (S30), and the determination result of the key input unit 110. When a key signal indicating the start of the operation is input, the valve driving signal for opening the first solenoid valve 30 is applied to the first solenoid valve driving unit 150 (S40).

As a result, the first solenoid valve driving unit 150 is operated by the valve driving signal applied from the controller 130 to open the first solenoid valve 30.

Next, the control unit 130 applies an operation frequency signal (for example, about 70 [HZ]) suitable for initial starting the compressor 10 to the compressor driving unit 140 (S50).

As a result, the compressor 10 starts to be initially started at the operating frequency corresponding to the operating frequency signal by the compressor driving unit 140 according to the operating frequency signal applied from the controller 130.

As described above, the refrigerant gas is compressed to high temperature and high pressure through the compressor 10 which is started as described above, and is supplied to the condenser 20, and the high temperature and high pressure refrigerant gas supplied from the compressor 10 is supplied to the liquid phase at high pressure and room temperature in the condenser 20. After condensation with the refrigerant, it is supplied to the first capillary tube 40 through the open first solenoid valve 30.

The liquid refrigerant at high pressure and room temperature supplied from the condenser 20 through the first solenoid valve 30 is reduced to low pressure through the first capillary tube 40, and then supplied to the first evaporator 50, and then to the first capillary tube. The low-pressure liquid refrigerant supplied from the 40 to the first evaporator 50 is vaporized through the first evaporator 50, thereby cooling the air in the first cooling chamber ROOM1.

At this time, the temperature of the first cooling chamber ROOM1 is sensed through the first temperature sensor 120, and a corresponding temperature signal is output from the first temperature sensor 120 and applied to the controller 130, and the controller 130. ) Determines the internal temperature of the first cooling chamber ROOM1 through the temperature signal applied from the first temperature sensor 120 (S60).

Next, the controller 130 determines whether the internal temperature of the first cooling chamber ROOM1 determined in the step S60 is less than or equal to a set temperature of the first cooling chamber ROOM1 input in the step S20. In operation S70, when the internal temperature of the first cooling chamber ROOM1 exceeds a set temperature of the first cooling chamber ROOM1, the internal temperature of the first cooling chamber ROOM1 is detected (S60). Proceeds to) repeatedly detects the internal temperature of the first cooling chamber (ROOM1).

If the internal temperature of the first cooling chamber ROOM1 is lower than or equal to the set temperature of the first cooling chamber ROOM1, the controller 130 opens the second solenoid valve 31. The valve driving signal is applied to the second solenoid valve driving unit 151 (S80).

As a result, the second solenoid valve driving unit 151 is operated by the valve driving signal applied from the controller 130 to open the second solenoid valve 31.

Next, the control unit 130 applies a valve driving signal for closing the first solenoid valve 30 to the first solenoid valve driving unit 150 (S90).

As a result, the first solenoid valve driving unit 150 is driven by the valve driving signal applied from the controller 130 to close the first solenoid valve 30.

For reference, closing the first solenoid valve 30 after first opening the second solenoid valve 31 may result in the flow of the refrigerant circulating in the refrigerant cycle when the first solenoid valve 30 is first closed. This is to prevent accidents that are blocked and the compressor 10 is impacted and overloaded.

At this time, the temperature of the second cooling chamber (ROOM2) is sensed through the second temperature sensor 121, the corresponding temperature signal is output from the second temperature sensor 121 is applied to the controller 130, the controller 130 ) Determines the internal temperature of the second cooling chamber ROOM2 through the temperature signal applied from the second temperature sensor 121 (S100).

Next, the controller 130 determines whether the internal temperature of the second cooling chamber ROOM2 determined in the step S100 is lower than or equal to a set temperature of the second cooling chamber ROOM2 input in the step S20. In operation S110, when the internal temperature of the second cooling chamber ROOM2 exceeds the set temperature of the second cooling chamber ROOM2, the internal temperature of the second cooling chamber ROOM2 is detected (S100). Proceeds to) repeatedly detects the internal temperature of the second cooling chamber (ROOM2).

If the internal temperature of the second cooling chamber ROOM2 is equal to or less than a set temperature of the second cooling chamber ROOM2, as a result of the determination in step S110, the controller 130 opens the first solenoid valve 30. The valve driving signal is applied to the first solenoid valve driving unit 150 (S120).

As a result, the first solenoid valve driving unit 150 is operated by the valve driving signal applied from the controller 130 to open the second solenoid valve 30.

Thereafter, the controller 130 controls the compressor according to the internal temperature of the first cooling chamber ROOM1 and the internal temperature of the second cooling chamber ROOM2 that are detected by the first temperature sensor 120 and the second temperature sensor 121. The operation frequency signal (for example, about 40 [HZ]) determined by determining the operation frequency of the device 10 is applied to the compressor driver 140 (S130), and the compressor 10 is operated by the compressor driver 140. It is operated according to the operating frequency determined by the controller 130.

As described above, according to the present invention, by supplying refrigerant to the plurality of evaporators one at a time at the initial startup of the cooling system, the compressor has a smaller size, thereby reducing noise and power consumption, and reducing manufacturing costs. .

Claims (2)

In the cooling system provided in each of the plurality of cooling chambers, an evaporator which generates cool air by receiving a refrigerant circulated by a compressor, A temperature setting step of setting a temperature of each cooling chamber; A compressor start step of starting the compressor at an operation frequency suitable for initial startup when an operation start command is input; A cooling step of supplying one refrigerant at a time to an evaporator installed in each of the cooling chambers according to the temperature of each cooling chamber and the temperature of each cooling chamber set in the temperature setting step; When the cooling step is completed, the refrigerant is supplied to all of the plurality of evaporators, the present temperature of each cooling chamber is compared with the temperature of each cooling chamber set in the temperature setting step, and the operation frequency is adjusted according to the comparison result. A drive control method for a cooling system comprising a temperature holding step of operating a compressor. The method of claim 1, wherein the cooling step, A refrigerant priority supply step of first supplying the refrigerant circulated by the compressor to any one of the plurality of evaporators; If the current temperature of the cooling chamber in which the evaporator to which the refrigerant is currently supplied is installed is lower than the temperature of the corresponding cooling chamber set in the temperature setting step, the supply of the refrigerant to the evaporator is stopped and the refrigerant is supplied to the other evaporator. Refrigerant sequential supply step And a cooling completion step of completing the cooling step if the current temperature of the cooling chamber in which evaporation is supplied last when the refrigerant is supplied is lower than the temperature of the corresponding cooling chamber set in the temperature setting step while repeatedly performing the refrigerant sequential supply step. Drive control method of a cooling system.