CN112021496A - A small pasteurizer and its control method - Google Patents

Abstract

The invention discloses a small pasteurizer and a control method thereof, and aims to provide a small pasteurizer which can be applied to households, restaurants, schools, restaurants of enterprises and institutions. It contains the chassis, heating components, cooling components and control components. Further, the heating component includes a hot water tank, a normal temperature water inlet valve, a normal temperature water inlet pipe, a cold water tank drainer, a cold water water delivery pipe, a water outlet valve and a water outlet pipe, and the refrigeration component includes a cold water tank, a small refrigerator, a water inlet valve and a water inlet pipe. , the control component includes a heating component control module, a cooling component control module, a power supply module and a human-machine interface. When the system is powered on, the heating component control module and the cooling component control module in the control component start running at the same time, respectively controlling the heating component and the cooling component to work.

Description

A small pasteurizer and its control method

technical field

The invention relates to a sterilization equipment, in particular to a small pasteurization equipment, a small pasteurization machine that can be used in households, restaurants and restaurants of enterprises and institutions.

Background technique

Pasteurization, also known as low temperature sterilization, is a method that uses lower temperatures to kill germs in food, which can maximize the color, aroma, taste and nutritional content of food from the destruction of high temperature treatment. . Usually, pasteurization method heats the object to be sterilized to 68-70°C, keeps it for 30 minutes, and then rapidly cools it to 4-5°C.

Existing pasteurizers are used for industrial production, such as milk production, beer production and beverage production. In daily life, some fruits and vegetables that people eat are also necessary to be processed by pasteurization. Fruits such as strawberries, mulberries, cherry tomatoes, and plums are not easy to peel and then eat, so they cannot completely remove pathogenic bacteria on the surface of the fruit. After eating these fruits, it is easy to cause diseases such as diarrhea. In addition, people in some regions like to eat some unprocessed vegetables, such as salads and burgers, which contain unprocessed vegetables. Eating unheated vegetables can also easily lead to diseases such as diarrhea. With the gradual improvement of living standards, people are more concerned about physical health issues, and the demand for pasteurizers in daily life is also gradually increasing. Usually, pasteurizers used for industrial production take up a lot of space, which is not convenient for use in daily life. Therefore, it is necessary to invent a pasteurizer with small size and low cost, so that It can be used in homes, restaurants and restaurants in schools, enterprises and institutions.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the present invention provides a small pasteurizer, which includes a chassis, and also includes a heating component, a refrigeration component and a control component. The refrigeration component includes a cold water tank, a refrigerator, a water inlet valve, and temperature sensor, the top of the cold water tank is provided with a water inlet, the bottom of the cold water tank is provided with a water outlet, the refrigerator is installed on the tank wall of the cold water tank, and the water inlet in the refrigeration assembly One end of the valve is communicated with the water inlet of the cold water tank, and the temperature sensor in the refrigeration assembly is arranged on the tank wall of the cold water tank,

The heating assembly includes a hot water tank, a heater, a normal temperature water inlet valve, a water outlet valve, a cold water tank drainer, a cold water water delivery pipe and a temperature sensor, the heater is installed at the bottom of the hot water tank, and the The top is provided with a normal temperature water inlet and a cold water inlet, the bottom of the hot water tank is provided with a water outlet, one end of the water inlet valve is connected with the normal temperature water inlet of the hot water tank, and one end of the water outlet valve is connected to the The water outlet of the hot water tank is in communication, the input end of the cold water tank drainer is in communication with the water outlet of the cold water tank, the output end of the cold water tank drainer is in communication with one end of the cold water water delivery pipe, and the cold water The other end of the water delivery pipe is communicated with the cold water inlet of the hot water tank, and the temperature sensor is arranged on the tank wall of the hot water tank,

The control assembly is electrically connected with the heater, the normal temperature water inlet valve, the water outlet valve, the cold water tank drainer and the temperature sensor in the heating assembly, and the control assembly is also connected with the refrigerator and the water inlet valve in the refrigeration assembly. electrically connected to the temperature sensor.

Further, the heating assembly further includes a liquid level sensor, the liquid level sensor is disposed on the tank wall of the hot water tank, and the refrigeration assembly further includes a liquid level sensor, and the liquid level sensor is disposed in the hot water tank. On the tank wall of the cold water tank, the control assembly is electrically connected with the liquid level sensor in the heating assembly, and the control assembly is also electrically connected with the liquid level sensor in the refrigeration assembly.

Further, the control assembly includes a heating assembly control module, a cooling assembly control module, a power supply module and a bus, and the heating assembly control module, the cooling assembly control module and the power supply module are connected together through a bus.

Further, the heating assembly control module includes a processor, a valve drive module, a heater drive module, a sensor data acquisition module, a cold water tank drain drive module and a bus, the processor, valve drive module, heater drive module , The sensor data acquisition module and the cold water tank drainer drive module are connected together through a bus, the valve drive module is electrically connected to the water inlet valve and the water outlet valve in the heating assembly, and the heater drive module is connected to the heating The heater in the assembly is electrically connected, the sensor data acquisition module is electrically connected with the liquid level sensor and the temperature sensor in the heating assembly, and the cold water tank drainer driving module is drained from the cold water tank in the heating assembly electrical connection.

Further, the refrigeration assembly control module includes a processor, a valve driving module, a refrigerator driving module, a sensor data acquisition module and a bus, and the processor, the valve driving module, the refrigerator driving module and the sensor data acquisition module are established through the bus. The valve drive module is electrically connected to the water inlet valve in the refrigeration assembly, the refrigerator drive module is electrically connected to the refrigerator in the refrigeration assembly, and the sensor data acquisition module is electrically connected to the liquid level sensor and temperature sensor in the refrigeration assembly. The sensor is electrically connected.

The invention also provides a control method for the small pasteurizer provided by the invention. After the system is powered on, the heating component control module and the refrigeration component control module in the control component start to work at the same time, and control the control module respectively. Hot and cold components work,

The refrigeration assembly control module controls the refrigeration assembly to work according to the following steps:

Step 501, open the water inlet valve;

Step 502, when the water level height in the cold water tank is greater than or equal to a preset threshold, close the water inlet valve;

Step 503, start the refrigerator;

Step 504, when the water temperature in the cold water tank is less than or equal to 4°C, adjust the cooling power of the refrigerator to stabilize the water temperature in the cold water tank within the range of 0-4°C,

The heating assembly control module controls the refrigeration assembly to work according to the following steps:

Step 601, open the normal temperature water inlet valve;

Step 602, when the water level in the hot water tank is greater than or equal to a preset threshold, close the normal temperature water inlet valve;

Step 603, start the heater;

Step 604, when the water temperature in the hot water tank is greater than or equal to 68°C, adjust the heating power of the heater to stabilize the water temperature in the hot water tank within the range of 68-70°C;

Step 605, after 30 minutes, open the water outlet valve;

Step 606, after emptying the water in the hot water tank, close the water outlet valve;

Step 607, open the normal temperature water inlet valve;

Step 608, when the water level in the hot water tank is greater than or equal to a preset threshold, close the normal temperature water inlet valve;

Step 609, after waiting for T ₁ minute, open the water outlet valve, and T ₁ is a constant set manually;

Step 610: Repeat steps 606 to 609 for N times, where N is an integer greater than or equal to 1;

Step 611, close the water outlet valve;

Step 612, start the cold water tank drainer to discharge the cold water in the cold water tank into the hot water tank;

Step 613, closing the cold water tank drainer;

Step 614, after waiting for T ₂ minutes, open the water outlet valve to empty the water in the hot water tank, and T ₂ is a constant set artificially.

Description of drawings

Fig. 1 shows the principle schematic diagram of the small pasteurizer of the present invention;

Fig. 2 shows the principle block diagram of the control assembly in the small pasteurizer of the present invention;

Fig. 3 shows the principle block diagram of the heating assembly control module in the small pasteurizer of the present invention;

Fig. 4 shows the principle block diagram of the refrigeration assembly control module in the small pasteurizer of the present invention;

Fig. 5 shows the control flow chart of the refrigeration assembly in the small pasteurizer of the present invention;

Fig. 6 shows the control flow chart of the heating assembly in the small pasteurizer of the present invention.

Detailed ways

With reference to the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1 , a small pasteurizer includes a chassis 1 , a heating component 2 , a cooling component 3 and a control component 4 . The case 1 includes a case body 11 and a case door 12 , and the case door 12 is arranged on the top of the case body 11 and is hinged on the case body 11 . The bottom of the box body 11 is further provided with a bracket 13 , and the heating component 2 and the cooling component 3 are mounted on the bracket 13 .

The refrigeration assembly 3 includes a cold water tank 31 , a refrigerator 32 , a water inlet valve 33 , a water inlet pipe 34 , a liquid level sensor 35 and a temperature sensor 36 . The cold water tank 31 is an open container, or a jar with a vent hole at the top. The refrigerator 32 is installed on the tank wall of the cold water tank 31 for cooling the water in the cold water tank 31 . The refrigerator 32 with suitable cooling power is selected so that it can reduce the temperature of the water in the cold water tank 31 to 0-4° C. within 30 minutes. The top of the cold water tank 31 is provided with a water inlet 311 , and the bottom is provided with a water outlet 312 . One end of the water inlet valve 33 is communicated with the water inlet 311 of the cold water tank 31 , the other end is communicated with one end of the water inlet pipe 34 , and the other end of the water inlet pipe 34 is communicated with the tap water pipe. The liquid level sensor 35 and the temperature sensor 36 are installed on the tank wall of the cold water tank 31, and are used to measure the water level and water temperature in the cold water tank 31, respectively.

The heating assembly 2 includes a hot water tank 21, a heater 22, a normal temperature water inlet valve 23, a normal temperature water inlet pipe 24, a water outlet valve 25, a water outlet pipe 26, a liquid level sensor 27, a temperature sensor 28, a cold water tank drainer 29 and a cold water outlet. Water pipe 20. The hot water tank 21 is an open container, and a heater 22 is installed at its bottom. A metal mesh 211 is arranged above the heater 22 , and the metal mesh 211 is used to separate the sterilized object from the heater 22 . When using the small pasteurizer of the present invention, the object to be sterilized needs to be placed on the metal mesh 211 . The top of the hot water tank 21 is provided with two water inlets: a normal temperature water inlet 212 and a cold water inlet 213 , and a water outlet 214 is provided at the bottom. On the tank wall of the hot water tank 201, a liquid level sensor 27 and a temperature sensor 28 are installed for measuring the water level and water temperature in the hot water tank 21, respectively. One end of the normal temperature water inlet valve 23 is communicated with the normal temperature water inlet 212 of the hot water tank 21, and the other end is communicated with one end of the normal temperature water inlet pipe 24, and the other end of the normal temperature water inlet pipe 24 is communicated with the tap water pipe. One end of the water outlet valve 25 is communicated with the water outlet 214 of the hot water tank 21 , and the other end is communicated with one end of the water outlet pipe 26 . The cold water tank drain 29 is used to drain the cold water in the cold water tank 31 into the hot water tank 21 . The input end of the cold water tank drainer 29 is communicated with the water outlet 312 of the cold water tank 31 , the output end is communicated with one end of the cold water water pipe 20 , and the other end of the cold water water pipe 20 is communicated with the cold water inlet 213 of the hot water tank 21 . If the height of the water outlet 312 of the cold water tank 31 is greater than or equal to the height of the cold water inlet 213 of the hot water tank 21, the cold water tank drain 29 can be a valve, otherwise the micro water pump needs to be used as the cold water tank drain 29.

The control assembly 4 is installed on the box wall of the cabinet body 11 . As shown in FIG. 2 , the control assembly 4 includes a heating assembly control module 41 , a refrigeration assembly control module 42 , a power module 43 and a man-machine interface 44 , and these four modules are connected through a bus 45 . The power module 43 is used to convert the 220V alternating current into direct current, and then supply power to the heating assembly control module 41 , the refrigeration assembly control module 42 and the man-machine interface 44 . The human-machine interface module 44 includes a display and a keyboard for setting and displaying control parameters, and sending control commands to the heating assembly control module 41 and the cooling assembly control module 42 .

As shown in FIG. 3 , the heating assembly control module 41 includes a processor 411 , a valve driving module 412 , a heater driving module 413 , a sensor data acquisition module 414 and a cold water tank drainer driving module 415 . These chips and modules are established through the bus 416 get in touch. The valve driving module 412 is electrically connected to the normal temperature water inlet valve 23 and the water outlet valve 25 in the heating assembly 2 . Through the bus 416, the valve driving module 412 receives the control command sent by the processor 411, and then sends a control signal to the normal temperature water inlet valve 23 or the water outlet valve 25 in the heating assembly 2 to turn them on or off. The heater driving module 413 is electrically connected to the heater 22 in the heating assembly 2 . The heater driving module 413 is configured to receive the control command sent by the processor 411 , and then adjust the heating power of the heater 22 . The cold water tank drain drive module 415 is electrically connected to the cold water tank drain 29 in the heating assembly 2 . Through the bus 416, the cold water tank drain drive module 415 receives the control command sent by the processor 411, and then sends a control signal to the cold water tank drain 29 in the heating assembly 2 to turn it on (or start) and close (or stop). . The sensor data acquisition module 414 is electrically connected to the liquid level sensor 27 and the temperature sensor 28 in the heating assembly 2 . It is used to collect the analog signals output by the liquid level sensor 27 and the temperature sensor 28 , convert the analog signals into digital signals, and then send them to the processor 411 through the bus 415 .

As shown in FIG. 4 , the refrigeration assembly control module 42 includes a processor 421 , a valve driving module 422 , a refrigerator driving module 423 and a sensor data acquisition module 424 , and these chips and modules are connected through a bus 425 . The valve driving module 422 is electrically connected to the water inlet valve 33 in the refrigeration assembly 3 . Through the bus 425, the valve driving module 422 receives the control command sent by the processor 421, and then sends a control signal to the water inlet valve 33 in the refrigeration assembly 3 to turn it on or off. The refrigerator driving module 423 is electrically connected to the refrigerator 32 in the refrigeration assembly 3 . Through the bus 425 , the refrigerator driving module 423 receives the control command sent by the processor 421 , and then adjusts the cooling power of the refrigerator 32 . The sensor data acquisition module 424 is electrically connected to the liquid level sensor 35 and the temperature sensor 36 in the refrigeration assembly 3, and is used to collect the analog signals output by the liquid level sensor 35 and the temperature sensor 36, convert the analog signals into digital signals, and then pass the bus 425. Sent to processor 421 .

When using the small pasteurizer of the present invention, the object to be sterilized is first put into the hot water tank 21 in the heating assembly 2, and the cabinet door 12 is closed. After the system is powered on, the heating assembly control module 41 and the cooling assembly control module 42 in the control assembly 4 start to work simultaneously. As shown in FIG. 5 , the refrigeration assembly control module 42 controls the refrigeration assembly 3 to work according to the following steps:

Step 501, open the water inlet valve;

Because one end of the water inlet valve 33 is communicated with the tap water pipe through the water inlet pipe 34, and the other end is communicated with the water inlet 311 of the cold water tank 31, after the water inlet valve 33 is opened, the normal temperature tap water will flow into the cold water tank 31.

Step 502, when the water level height in the cold water tank is greater than or equal to a preset threshold, close the water inlet valve;

After the water inlet valve 33 is opened, the liquid level sensor 35 is used to measure the water level in the cold water tank 31 in real time. Once the water level is greater than or equal to a preset threshold, the water inlet valve 33 is closed.

Step 503, start the refrigerator;

The refrigerator 32 is started to work, so that the temperature of the water in the cold water tank 31 is gradually lowered.

Step 504, when the water temperature in the cold water tank is less than or equal to 4°C, adjust the cooling power of the refrigerator to stabilize the water temperature in the cold water tank within the range of 0-4°C.

Use the temperature sensor 36 to measure the temperature of the water in the cold water tank 31 in real time. When the water temperature in the cold water tank is less than or equal to 4°C, the PID algorithm can be used to adjust the cooling power of the refrigerator 32, so that the water temperature in the cold water tank is stable at 0-4°C within the range.

As shown in FIG. 6 , the heating assembly control module 41 controls the heating assembly 2 to work according to the following steps:

Step 601, open the normal temperature water inlet valve;

Since one end of the normal temperature water inlet valve 23 is connected to the normal temperature water inlet 212 of the hot water tank 21, and the other end is connected to the tap water pipe through the normal temperature water inlet pipe 24, after opening the normal temperature water inlet valve 23, the normal temperature tap water will flow into the hot water tank 21. .

Step 602, when the water level in the hot water tank is greater than or equal to a preset threshold, close the normal temperature water inlet valve;

After opening the normal temperature water inlet valve 23, use the liquid level sensor 27 to measure the water level in the hot water tank 21 in real time. Once the water level is greater than or equal to a preset threshold, the normal temperature water inlet valve 23 is closed.

Step 603, start the heater;

Start the heater 22 to work, so that the water temperature in the hot water tank 21 gradually increases.

Step 604, when the water temperature in the hot water tank is greater than or equal to 68°C, adjust the heating power of the heater to stabilize the water temperature in the hot water tank within the range of 68-70°C;

The PID algorithm can be used to adjust the heating power of the heater 22 to stabilize the water temperature in the hot water tank 21 .

Step 605, after 30 minutes, open the water outlet valve;

Since one end of the water outlet valve 25 is connected to the water outlet 214 of the hot water tank 21 and the other end is connected to the water outlet pipe 26 , after the water outlet valve 25 is opened, the hot water in the hot water tank 21 will be discharged through the water outlet pipe 26 .

Step 606, after emptying the water in the hot water tank, close the water outlet valve;

During the drainage process, the liquid level sensor 27 is used to measure the water level in the hot water tank 21 in real time, and once it is found that the hot water in the hot water tank 21 has been drained, the water outlet valve 25 is closed.

Step 607, open the normal temperature water inlet valve;

After the normal temperature water inlet valve 23 is opened, the normal temperature tap water flows into the hot water tank 21 again.

Step 608, when the water level in the hot water tank is greater than or equal to a preset threshold, close the normal temperature water inlet valve;

The liquid level sensor 27 is used to measure the water level in the hot water tank 21 in real time, and once the water level is greater than or equal to a preset threshold, the normal temperature water inlet valve 23 is closed.

Step 609, after waiting for T ₁ minute, open the water outlet valve, and T ₁ is a constant set manually;

Open the water outlet valve 25 again, so that the water in the hot water tank 21 flows out.

Step 610: Repeat steps 606 to 609 for N times, where N is an integer greater than or equal to 1;

The purpose of this is to use room temperature water to repeatedly rinse the sterilized object to reduce the temperature of the sterilized object.

Step 611, close the water outlet valve;

After the water in the hot water tank 21 is drained, the water outlet valve 25 is closed.

Step 612, open the cold water tank drainer, and discharge the cold water in the cold water tank into the hot water tank;

Turning on the cold water tank drainer 29 can discharge the cold water in the cold water tank 31 into the hot water tank 21 to cool the sterilized objects in the hot water tank 21 .

Step 613, closing the cold water tank drainer;

After the cold water in the cold water tank 31 is emptied, the cold water tank drain 29 is closed.

Step 614, after waiting for T ₂ minutes, open the water outlet valve to empty the water in the hot water tank, and T ₂ is a constant set manually;

After draining (or pumping) the cold water into the hot water tank 21, wait for T minutes to allow the sterilized object to fully exchange heat with the cold water, so that the temperature of the sterilized object in the hot water tank 21 rapidly drops to 4-5°C. Finally, the water in the hot water tank 21 is emptied to complete the sterilization.

Claims (6)

1. A small pasteurizer comprising a chassis (1), characterized in that it also comprises a heating assembly (2), a refrigeration assembly (3) and a control assembly (4), the refrigeration assembly (3) comprising A cold water tank (31), a refrigerator (32), a water inlet valve (33), and a temperature sensor (36), the top of the cold water tank (31) is provided with a water inlet (311), the cold water tank (31) ) is provided with a water outlet (312) at the bottom, the refrigerator (32) is installed on the tank wall of the cold water tank (31), and one end of the water inlet valve (33) in the refrigeration assembly (3) is connected to the The water inlet (311) of the cold water tank (31) is connected, and the temperature sensor (36) in the refrigeration assembly (3) is arranged on the tank wall of the cold water tank (31), The heating assembly comprises a hot water tank (21), a heater (22), a normal temperature water inlet valve (23), a water outlet valve (25), a cold water tank drainer (29), a cold water water delivery pipe (20) and a temperature sensor ( 28), the heater (22) is installed at the bottom of the hot water tank (21), and the top of the hot water tank (21) is provided with a normal temperature water inlet (212) and a cold water inlet (213), The bottom of the hot water tank (21) is provided with a water outlet (214), one end of the water inlet valve (23) is communicated with the normal temperature water inlet (212) of the hot water tank (21), and the water outlet valve (25) ) is in communication with the water outlet (214) of the hot water tank (21), the input end of the cold water tank drain (29) is in communication with the water outlet (312) of the cold water tank (31), and the cooling The output end of the water tank drainer (29) is communicated with one end of the cold water water delivery pipe (20), and the other end of the cold water water delivery pipe (20) is communicated with the cold water inlet (213) of the hot water tank (21), The temperature sensor (28) is arranged on the tank wall of the hot water tank (21), The heater (22), the normal temperature water inlet valve (23), the water outlet valve (25), the cold water tank drainer (29) and the temperature sensor (28) in the control assembly (4) and the heating assembly (2) ) is electrically connected, and the control assembly (4) is also electrically connected with the refrigerator (32), the water inlet valve (33) and the temperature sensor (36) in the refrigeration assembly (3). 2 . The small pasteurizer according to claim 1 , wherein the heating assembly ( 2 ) further comprises a liquid level sensor ( 27 ), and the liquid level sensor ( 27 ) is arranged in the On the tank wall of the hot water tank (21), the refrigeration assembly (3) further includes a liquid level sensor (35), the liquid level sensor (35) is arranged on the tank wall of the cold water tank (31), the The control assembly (4) is electrically connected with the liquid level sensor (27) in the heating assembly (2), and the control assembly (4) is also electrically connected with the liquid level sensor (35) in the refrigeration assembly (3). connect. 3. The small pasteurizer according to claim 2, wherein the control assembly (4) comprises a heating assembly control module (41), a refrigeration assembly control module (42), and a power module (43) and a bus (45), the heating assembly control module (41), the refrigeration assembly control module (42) and the power module (43) are connected together through the bus (45). 4. The small pasteurizer according to claim 3, wherein the heating assembly control module (41) comprises a processor (411), a valve driving module (412), and a heater driving module (413) ), sensor data acquisition module (414), cold water tank drainer drive module (415) and bus (416), the processor (411), valve drive module (412), heater drive module (413), sensor data The collection module (414) and the cold water tank drain drive module (415) are connected together through the bus (416), The valve driving module (412) is electrically connected to the water inlet valve (23) and the water outlet valve (25) in the heating assembly (2), and the heater driving module (413) is connected to the heating assembly (2). ) in the heater (22) is electrically connected, the sensor data acquisition module (414) is electrically connected with the liquid level sensor (27) and the temperature sensor (28) in the heating assembly (2), the cold water tank is electrically connected The drainer driving module (415) is electrically connected with the cold water tank drainer (29) in the heating assembly (2). 5. The small pasteurizer according to claim 3, wherein the refrigeration assembly control module (42) comprises a processor (421), a valve driving module (422), and a refrigerator driving module (423) , a sensor data acquisition module (424) and a bus (425), the processor (421), the valve drive module (422), the refrigerator drive module (423) and the sensor data acquisition module (424) are established through the bus (425) get in touch, The valve drive module (422) is electrically connected to the water inlet valve (33) in the refrigeration assembly (3), and the refrigerator drive module (423) is electrically connected to the refrigerator (32) in the refrigeration assembly (3), so The sensor data acquisition module (424) is electrically connected with the liquid level sensor (35) and the temperature sensor (36) in the refrigeration assembly (3). 6. A control method for the small pasteurizer according to claim 3, characterized in that, after the system is powered on, the heating assembly control module (41) and the refrigeration assembly control module (4) in the control assembly The modules (42) start working at the same time, respectively control the heating component (2) and the cooling component (3) to work, The refrigeration assembly control module (42) controls the refrigeration assembly (3) to work according to the following steps: Step 501, open the water inlet valve; Step 502, when the water level height in the cold water tank is greater than or equal to a preset threshold, close the water inlet valve; Step 503, start the refrigerator; Step 504, when the water temperature in the cold water tank is less than or equal to 4°C, adjust the cooling power of the refrigerator to stabilize the water temperature in the cold water tank within the range of 0-4°C, The heating assembly control module (41) controls the refrigeration assembly (2) to work according to the following steps: Step 601, open the normal temperature water inlet valve; Step 602, when the water level in the hot water tank is greater than or equal to a preset threshold, close the normal temperature water inlet valve; Step 603, start the heater; Step 604, when the water temperature in the hot water tank is greater than or equal to 68°C, adjust the heating power of the heater to stabilize the water temperature in the hot water tank within the range of 68-70°C; Step 605, after 30 minutes, open the water outlet valve; Step 606, after emptying the water in the hot water tank, close the water outlet valve; Step 607, open the normal temperature water inlet valve; Step 608, when the water level in the hot water tank is greater than or equal to a preset threshold, close the normal temperature water inlet valve; Step 609, after waiting for T ₁ minute, open the water outlet valve, and T ₁ is a constant set manually; Step 610: Repeat steps 606 to 609 for N times, where N is an integer greater than or equal to 1; Step 611, close the water outlet valve; Step 612, start the cold water tank drainer to discharge the cold water in the cold water tank into the hot water tank; Step 613, closing the cold water tank drainer; Step 614, after waiting for T ₂ minutes, open the water outlet valve to empty the water in the hot water tank, and T ₂ is a constant set artificially.

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