Refrigerating plant for water dispenser and control method therefor, and water dispenser

A refrigerating device for a water dispenser, comprising:

• a cold water tank;
• a refrigerating module, configured to reduce a temperature of water in the cold water tank;
• a control module, configured to control the refrigerating module to reduce the temperature of the water in the cold water tank by performing following steps in sequence:
• S1, controlling by the control module the refrigerating module to reduce the temperature of the water in the cold water tank;
• S2, when the temperature of the water in the cold water tank is reduced to a first predetermined temperature, stopping the refrigerating module by the control module for a first predetermined time period;
• S3, controlling by the control module the refrigerating module to work again to continue to reduce the temperature of the water in the cold water tank;
• S4, when the temperature of the water in the cold water tank is reduced to an nth predetermined temperature, stopping the refrigerating module by the control module for an nth predetermined time period, wherein the nth predetermined temperature is not greater than an (n−1)th predetermined temperature, where n is a positive integer greater than or equal to 2 and less than or equal to N;
• and
• S5, determining by the control module whether the temperature of the water in the cold water tank reaches a target temperature, if no, repeating steps S3-S4 after n is stepped-up by 1, wherein the target temperature is configured as an Nth predetermined temperature.

A water dispenser, comprising a refrigerating device for a water dispenser, wherein the refrigerating device includes:

• a cold water tank;
• a refrigerating module, configured to reduce a temperature of water in the cold water tank;
• a control module, configured to control the refrigerating module to reduce the temperature of the water in the cold water tank by performing following steps in sequence:
• S1, controlling by the control module the refrigerating module to reduce the temperature of the water in the cold water tank;
• S2, when the temperature of the water in the cold water tank is reduced to a first predetermined temperature, stopping the refrigerating module by the control module for a first predetermined time period;
• S3, controlling by the control module the refrigerating module to work again to continue to reduce the temperature of the water in the cold water tank;
• S4, when the temperature of the water in the cold water tank is reduced to an nth predetermined temperature, stopping the refrigerating module by the control module for an nth predetermined time period, wherein the nth predetermined temperature is not greater than an (n−1)th predetermined temperature, where n is a positive integer greater than or equal to 2 and less than or equal to N;
• and
• S5, determining by the control module whether the temperature of the water in the cold water tank reaches a target temperature, if no, repeating steps S3-S4 after n is stepped-up by 1, wherein the target temperature is configured as an Nth predetermined temperature.