KR0169889B1 - Ice cream maker - Google Patents

Abstract

The present invention controls the production of soft ice cream.

According to the present invention, when the condenser temperature detector of the temperature controller detects the temperature of the condenser and the detected temperature is equal to or higher than the temperature of the condenser set in the condenser temperature setting unit, the condenser cooling drive unit controls the cooling fan according to the control of the temperature control microprocessor. Drive to cool the condenser, and generate an overheat signal when the detected condenser temperature becomes higher than the overheat temperature, and the drive control unit detects the rotational speed of the stirring motor, and the detected rotational speed is set to the stop time / rotational speed. Stop the stirring motor and compressor during the set stop time when the rotation speed is lower than that of the unit, and stop the compressor when the overheat signal is input from the temperature control unit to prevent the condenser from overheating. To the evaporator installed in the raw material storage tank. By cooling the stored raw material by flowing in, it prevents the stored raw material from spoiling.

Description

Control Circuit and Control Method of Ice Cream Maker

1 is a control circuit diagram of the present invention.

FIG. 2 is a detailed circuit diagram showing the configuration of the temperature controller of FIG.

3 is a detailed circuit diagram showing the configuration of the drive control unit of FIG.

4 is a signal flow diagram showing the operation of the drive control microprocessor of FIG.

5 is a signal flow diagram showing the operation of the temperature control microprocessor of FIG.

* Explanation of symbols for the main parts of the drawings

100: temperature controller 110: microprocessor for temperature control

120,230: oscillation part 130,220: initial reset part

140: condenser temperature setting unit 150: condenser temperature detection unit

160: condenser cooling drive unit 170: drive control signal input unit

200: drive control unit 210: microprocessor for drive control

240: overheat signal input unit 250: rotational speed detection unit

260: discharge detection unit 270: stop time / speed setting unit

280: stirring motor drive unit 290: compressor drive unit

300: first valve control unit 310: second valve control unit

The present invention relates to a control circuit and a control method of an ice cream maker for controlling the production of soft ice cream.

In general, soft ice cream is prepared by mixing raw materials such as milk and cooling while generating bubbles.

To this end, conventionally, a screw is installed in a manufacturing tank, and the screw is rotated at a high speed with a stirring motor to stir to generate bubbles in the raw material in the manufacturing tank. An evaporator of a refrigeration cycle is installed outside the manufacturing tank to drive the compressor. The raw materials are cooled by cold generated in the evaporator.

However, the above-described conventional technology is to produce ice cream while continuously driving the stirring motor and the compressor regardless of the manufacturing state of the ice cream when the power switch is turned on, and the stirring motor is continuously overloaded even when the production of the ice cream is completed, This causes a problem that the stirring motor is damaged.

In the related art, the cooling fan is continuously driven to cool the condenser of the refrigerating cycle, and even when the temperature of the condenser is low, the cooling fan is continuously driven, thereby consuming much power.

In addition, although the cooling efficiency of the evaporator is rather reduced when the temperature of the condenser is very high, conventionally, the compressor was continuously driven regardless of the temperature of the condenser, and thus there were various problems such as low ice cream manufacturing efficiency.

Accordingly, an object of the present invention is to provide a control circuit and a control method of an ice cream maker that cools a condenser by driving a cooling fan when the temperature of the condenser becomes a predetermined temperature or more.

Another object of the present invention is to provide a control circuit and a control method of an ice cream maker which stops the compressor when the temperature of the condenser becomes higher than a preset overheating temperature so that the condenser is no longer overheated.

Still another object of the present invention is to provide a control circuit and a control method of an ice cream maker which stops the stirring motor when the ice cream is manufactured and is not damaged when the stirring motor is overloaded.

Still another object of the present invention is to provide a control circuit and a control method of an ice cream maker in which the raw material storage tank is cooled by the coolant of the refrigerant when the ice cream is manufactured and the compressor is stopped to prevent the raw material from being damaged.

The control circuit and control method of the ice cream maker of the present invention for achieving the above object is that when the condenser temperature detector of the temperature control unit detects the temperature of the condenser, and the detected temperature is equal to or higher than the temperature of the condenser set in the condenser temperature setting unit. The condenser cooling drive unit drives the cooling fan to cool the condenser according to the control of the temperature control microprocessor, and generates an overheat signal when the detected condenser temperature becomes higher than the overheat temperature.

The drive control unit detects the rotation speed of the stirring motor, stops the stirring motor and the compressor during the set stop time when the detected rotation speed is equal to or less than the rotation speed set in the stop time / rotation speed setting unit, When the overheat signal is input, the compressor is stopped to prevent the condenser from overheating.

According to the present invention, when the compressor is stopped, the refrigerant discharged through the capillary tube flows into the evaporator installed in the raw material storage tank to cool the stored raw material, thereby preventing the stored raw material from being damaged.

Hereinafter, with reference to the accompanying drawings will be described in detail the control circuit and the control method of the ice cream maker of the present invention.

FIG. 1 is a control circuit diagram of the present invention, and FIGS. 2 and 3 are detailed circuit diagrams showing the configuration of the temperature controller and the drive controller of FIG. As shown therein, the control circuit of the present invention includes a temperature controller 100 for controlling the temperature of the condenser and a drive controller 200 for controlling the production of ice cream.

The temperature controller 100 controls the cooling by judging the temperature of the condenser, and controls the cooling and generates an overheat signal when overheated, and oscillates to operate the clock signal to the temperature controlling microprocessor 110. A resistor for resetting the temperature control microprocessor 110 at the beginning of the oscillation unit 120 of the condenser (C ₁ , C ₂ ) and the crystal (XT ₁ ) for inputting the operating power (B ₁ ⁺ ) is supplied. (R ₁ ~R _3), the zener diode (ZD _1), the transistor (Q ₁₎ and a capacitor (C _3), the initial reset unit 130, and, by setting the cooling temperature of the condenser, the temperature controlling microprocessor to the ( resistance (R4~R to the input 110) _9), diodes (D ₁ ~D ₈₎ and dip switch (DP ₁ ~DP ₈₎ with the condenser temperature setting unit 140, to detect the temperature of the condenser temperature Temperature sensor 151 and resistance (R ₁ ) input to the control microprocessor 110. Resistor (R ₁₃ to R ₁₅ ) and transistor (Q ₂ ) for cooling the condenser under the control of the condenser temperature detection unit 150 including ₀ to R ₁₂ and the condenser C ₄ , and the temperature control microprocessor 110. ), A diode (D ₉ ), a relay (RY ₁ ), a relay switch (RYS ₁ ), and a cooling fan 161 and a condenser cooling driver 160, and a driving control signal to the temperature control microprocessor 110. And a drive control signal input unit 170 made of a resistor R ₁₆ to R ₁₈ , a diode D ₁₀ , and a photocouple PC ₁ .

The drive control unit 200 controls the drive of the stirring motor and the compressor and the flow of the refrigerant while the drive switch SW is pressed, and the drive control microprocessor 210 for controlling the manufacturing operation of the ice cream, and the initial operating power is applied. An initial reset portion 220 including resistors R ₂₁ to R ₂₃ , a constant voltage diode ZD ₂₁ , a transistor Q ₂₁ , and a capacitor C ₂₁ to reset the drive control microprocessor 210 to the microcontroller 210. And an oscillator 230 comprising oscillators C ₂₂ and C ₂₃ and a crystal XT ₂₁ for oscillating and supplying an operation clock signal to the drive control microprocessor 210, and for controlling the temperature of the temperature controller 100. An overheat signal input unit 240 including a resistor R ₂₄ to R ₃₆ , a diode D ₂₁ , and a photo coupler PC ₂₁ to input the overheat signal generated by the microprocessor 110 to the microprocessor 210 for driving control. With the rotation speed of the stirring motor And a detection speed sensor 251 to be input to the drive control of the microprocessor 210, the capacitor (C _22), resistor (R ₂₇ ~R _29), a diode (D _22, D ₂₃₎ and a photo coupler (PC ₂₂₎ Rotational speed detection unit 250, the limit switch LS to determine whether the manufactured ice cream is discharged to the drive control microprocessor 210, the resistor (R ₃₀ ~ R 0 ₃₄ ), the diode (D ₂₄ , D ₂₅ ) and a discharge detector 260 composed of a transistor Q ₂₂ , a resistor (R ₃₅ to R ₄₀ ), and a diode which set the stop time and the rotation speed of the stirring motor and input the same to the drive control microprocessor 210. (D _{26 to} D ₃₃ ) and a stop time / rotation speed setting unit 270 including the dip switches DP _{21 to} DP ₂₈ , and a resistance for driving the stirring motor under the control of the drive control microprocessor 210 ( R ₄₁ ), stirring with inverter (IV ₂₁ ), relay (RY ₂₁ ) and relay switch (RYS ₂₁ ) Compressor comprising a resistor (R ₄₂ ), an inverter (IV ₂₂ ), a relay (RY ₂₂ ), and a relay switch (RYS ₂₂ ) for driving the compressor under the control of the motor driver 280 and the drive control microprocessor 210. A resistor for controlling the first valve and the second valve according to the control of the driving unit 290 and the driving control microprocessor 210 so that the refrigerant discharged from the condenser cools the manufacturing tank and the raw material storage tank, respectively (R _43). ) (R ₄₄ ), inverter (IV ₂₃ ) (IV ₂₄ ), relay (RY ₂₃ ) (RY ₂₄ ) and relay switch (RYS ₂₃ ) (RYS ₂₄ ) The control unit 310 was configured.

In the control circuit of the present invention configured as described above, the initial reset units 130 and 220 generate reset signals at an initial stage when operating power is applied, and the generated reset signals are used for the temperature control microprocessor 110 and the drive control. The microprocessor 210 is inputted to the microprocessor 210 and is initially reset. The oscillator 120 and 230 oscillate to apply an operation clock signal to the control microprocessor 110 and the drive control microprocessor 210.

When the driving switch SW is pressed in such a state, the driving control microprocessor 210 determines whether the driving mode is the current driving mode as shown in FIG. 4 and sets the stop mode in the driving mode. If not, the drive control signal is output after setting the drive mode.

The drive control signal output by the drive control microprocessor 210 is input to the temperature control microprocessor 110 through the photo coupler PC ₁ of the drive control signal input unit 170.

Then, as shown in FIG. 5, the temperature control microprocessor 110 determines whether the drive mode is the current drive mode, sets the stop mode in the drive mode, and sets the drive mode if the drive mode is not. Determine whether the drive mode.

In this case, when the current driving mode is not present, the temperature control microprocessor 110 stops all operations and repeatedly performs an operation of determining whether a driving control signal is input.

Then, in the current driving mode, the temperature control microprocessor 110 determines to start manufacturing ice cream, and inputs the set temperature of the condenser set by the dip switches DP _{1 to} DP ₈ of the condenser temperature setting unit 140. Then, the temperature of the condenser detected by the temperature sensor 151 of the condenser temperature detector 150 is input and compared with the set temperature of the condenser.

If the temperature of the input condenser is lower than the preset temperature, the cooling fan 161 is not driven. If the temperature is higher than the set temperature, the temperature control microprocessor 110 controls the condenser cooling driver 160 to control the cooling fan 161. ), That is, the temperature control microprocessor 110 outputs a high potential to the condenser cooling driver 160, and the transistor Q ₂ by the output high potential is turned on to drive the relay RY ₁ . RYS ₁ ) is connected, and the AC power source AC is applied to the cooling fan 161 through the relay switch RYS ₁ to force the cooling fan 161 to cool the condenser.

In this state of driving the cooling fan 161 to force cooling of the condenser, the temperature control microprocessor 110 continuously determines the temperature of the condenser to determine whether it is overheated, and generates an overheat signal when the temperature exceeds the preset overheat temperature. do.

On the other hand, the drive control microprocessor 210 outputs the drive control signal as described above, determines whether it is the current drive mode, and stops all drive operations when the drive mode is not in the drive mode, and the signal of the drive switch SW The operation of determining whether an input is performed is repeated.

In the current driving mode, it is determined whether the overheat signal is input from the temperature control microprocessor 110.

That is, the overheat signal output from the temperature control microprocessor 110 is input to the drive control microprocessor 210 through the photocoupler PC ₂₁ of the overheat signal input unit 24, and the drive control microprocessor 210 overheats. It is determined whether the overheat signal is input as the signal of the signal input unit 240.

At this time, when the overheat signal is input, the drive control microprocessor 210 controls the stirring motor driver 280 and the compressor 290 to stop the stirring motor and the compressor, that is, the drive control microprocessor 210 controls the stirring motor. The low potential is output to the driving unit 280 and the compressor 290, and the output low potential is inverted to a high potential through the inverters IV ₂₁ and IV ₂₂ and applied to the relay RY ₂₁ and RY ₂₂ . The RY ₂₁ (RY ₂₂ ) is not driven and the relay switch (RYS ₂₁ ) (RYS ₂₂ ) is not connected and the stirring motor and the compressor are stopped.

As described above, when the overheat signal is input and the stirring motor and the compressor are stopped, the driving control microprocessor 210 determines whether to discharge the ice cream manufactured by the signal of the discharge detection unit 260.

That is, when the limit switch LS is connected while opening the discharge port for discharging the manufactured ice cream, the signal of the limit switch LS is level-limited by the diodes D ₂₄ and D ₂₅ and the resistors R ₃₀ to R ₃₃ ) and is applied to the base of the transistor Q ₂₂ after being shaped by the capacitor C ₂₃ , so that the transistor Q ₂₂ outputs an ice cream discharge signal while being turned on and off in accordance with the connection and opening of the limit switch LS. By being input to the drive control microprocessor 210, the drive control microprocessor 210 drives the stirring motor through the stirring motor driver 280 when the discharge signal is input, thereby allowing the ice cream to be discharged.

When the overheat signal is not input, the driving control microprocessor 210 determines whether the current stop state is present, and when the stop state is stopped, the dip switches DP _{21 to} DP ₂₄ of the stop time / rotation speed setting unit 270. It is determined whether the preset stop time has elapsed.

When a preset stop time has elapsed or is not presently stopped, the microprocessor 210 controls the stirring motor driver 280 and the compressor 290 to drive the stirring motor and the compressor, and the first valve controller 300. By opening the first valve through the refrigerant to be introduced into the evaporator attached to the ice cream manufacturing tank while the compressor is set in advance by the dip switch (DP ₂₅ ~ DP ₂₈ ) of the stop time / rotational speed setting unit 270 After the rotation speed of the stirring motor is input, it is determined whether the rotation speed of the stirring motor detected by the rotation speed detection unit 250 is rotated below a preset rotation speed.

In other words, when the production of ice cream is not completed, the raw material is in a liquid state, so that the load is reduced to the stirring motor and rotates at a high speed. The rotation speed detection unit 250 drives the speed sensor 251 to generate a pulse signal as the stirring motor rotates, and the generated pulse signal is input to the drive control microprocessor 210 through the photo coupler PC ₂₂ . The control microprocessor 210 determines whether the stirring motor is rotated below the set rotation speed by comparing the output signal of the rotation speed detector 250 with the set rotation speed.

At this time, when the rotation speed of the stirring motor is less than the set rotation speed, the drive control microprocessor 210 controls the stirring motor drive unit 280 and the compressor 290 to stop the stirring motor and the compressor, the first valve control unit 300 The first valve is closed to prevent the refrigerant from flowing into the evaporator installed in the manufacturing tank, and the second valve is opened through the second valve controller 310 to allow the refrigerant to flow into the evaporator installed in the raw material storage tank. After allowing the storage tank to cool, it is determined whether the set time has elapsed, that is, whether the set time for cooling the raw material storage tank has elapsed, and when the set time has elapsed, the second valve is closed again, and the discharge signal is input. Drive the stirring motor to discharge the produced ice cream.

As described above, the present invention prevents the cooling fan from being driven unnecessarily by driving the cooling fan to cool the condenser when the temperature of the condenser becomes higher than the preset temperature, and stops the compressor when the condenser is overheated. Is no longer overheated, stops the agitator motor if it is overloaded, and does not damage it. When the compressor is stopped, the raw material storage tank is cooled by the coolant of the remaining refrigerant to prevent the raw material from spoiling. .

Claims (3)

A temperature control microprocessor 110 for controlling cooling by determining a temperature of the condenser and generating an overheat signal when overheated; and an oscillator 120 for oscillating and inputting an operation clock signal to the temperature control microprocessor 110; In addition, an initial reset unit 130 for resetting the temperature control microprocessor 110 at an initial operation power B ₁ ⁺ is set, and a cooling temperature of a condenser is set to the temperature control microprocessor 110. The condenser temperature setting unit 140 for inputting, the condenser temperature detection unit 150 for detecting the temperature of the condenser and inputting it to the temperature control microprocessor 110, and the condenser according to the control of the temperature control microprocessor 110. Drive control signal for cooling the condenser cooling drive unit 160 for cooling, and the drive control signal to the temperature control microprocessor 110 An input unit 170, a drive control microprocessor 210 for controlling the operation of the agitator motor and the compressor and the flow of the coolant while the drive switch SW is pressed, and an initial operation source to which the operating power is applied. An initial reset unit 220 for resetting the drive control microprocessor 210, an oscillator 230 for oscillating and supplying an operation clock signal to the drive control microprocessor 210, and the temperature controller ( An overheat signal input unit 240 for inputting an overheat signal generated by the temperature control microprocessor 110 of the control unit 100 to the drive control microprocessor 210, and detects the rotational speed of the stirring motor to detect the rotational speed of the drive control microprocessor 210. The rotational speed detection unit 250 inputted to the control unit and the manufactured ice cream are discharged to the drive control microprocessor A stop time / rotation speed setting unit 270 for setting the discharge detection unit 260 to be turned off, a stop time and a rotation speed of the agitation motor, and inputting the stop time and rotation speed to the drive control microprocessor 210; Of the stirring motor driving unit 280 for driving the stirring motor under the control of the control unit, the compressor driving unit 290 for driving the compressor under the control of the driving control microprocessor 210, and the driving control microprocessor 210 of the driving control microprocessor 210. The first valve control unit 300 and the second valve control unit 310 to control the first valve and the second valve according to the control so that the refrigerant discharged from the condenser to cool the manufacturing tank and the raw material storage tank, respectively. The control circuit of the ice cream maker. A first step of alternately setting the driving mode and the stop mode according to the pressing of the driving switch; a second step of determining the temperature of the condenser in the driving mode in the first step; and a temperature of the condenser in the second step Is a third process of cooling the condenser when the temperature is equal to or higher than the set temperature, and a fourth process of generating an overheat signal when the condenser is overheated in the third process, and a superheated day in the fourth process. In this case, after stopping the stirring motor and the compressor and driving the stirring motor according to the discharge of the ice cream, the fifth process is repeated from the first process, and if the overheating is not performed in the fourth process, the stop time is currently stopped. And a sixth process of determining whether it has passed, and cooling the manufacturing tank while driving the compressor and the stirring motor when the stop state or the stop time has elapsed in the sixth process. A seventh process of determining a rotational speed of the high-stirring motor, and a seventh process of repeating the first process after driving the stirring motor according to the discharge of the ice cream when the rotational speed of the stirring motor is greater than or equal to the set speed in the seventh process. When the stop time has not elapsed in the stop state in step 8 and the sixth step or when the stirring motor rotates below the set speed in the seventh step, the stirring motor and the compressor are stopped and the stirring motor is driven according to the discharge of the ice cream. The control method of the ice cream maker characterized in that the control to the ninth process to perform repeatedly from the first process. The control method according to claim 2, wherein the ninth process stops cooling of the production tank and cools the raw material storage tank for a preset time when the stirring motor rotates below the set speed.