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EP-4737814-A1 - CONTROL METHOD AND APPARATUS FOR ENERGY STORAGE HEAT EXCHANGE ELECTRIC WATER HEATER

EP4737814A1EP 4737814 A1EP4737814 A1EP 4737814A1EP-4737814-A1

Abstract

The present invention relates to the technical field of household appliances, and provides a control method and apparatus for an energy storage heat exchange electric water heater. The control method includes: preliminarily heating a liquid in a water tank (100) to a first preset temperature value by using an energy storage electric heater (300), and maintaining the temperature; performing heat exchange on a water in a heat exchanger (200) by using the heated liquid in the water tank (100) to obtain a water of the first preset temperature value; acquiring a water flow signal value of the energy storage heat exchange electric water heater (10); judging whether the water flow signal value satisfies a first preset trigger requirement; if the water flow signal value satisfies the first preset trigger requirement, outputting the water of the first preset temperature value in the heat exchanger (200) to a thermostatic valve (500); controlling a flow-through electric heater (400) and the thermostatic valve (500) to be in an activated operating state at the same time, and using the thermostatic valve (500) to mix the water of the first preset temperature value with a cold water inputted from a water inlet (11), to obtain a mixed water; and heating the mixed water outputted by the thermostatic valve (500) to a second preset temperature value by using the flow-through electric heater (400). The present invention is able to reduce a time required for a user from heating water to using water.

Inventors

  • PU, JUNCHENG
  • TANG, WEIWEI
  • MA, Haichuan
  • ZHONG, Shaohai

Assignees

  • Guangdong Macro Gas Appliance Co., Ltd.

Dates

Publication Date
20260506
Application Date
20250630

Claims (10)

  1. A control method for an energy storage heat exchange electric water heater, wherein the energy storage heat exchange electric water heater (10) comprises a water tank (100), an energy storage electric heater (300), a heat exchanger (200), a flow-through electric heater (400) and a thermostatic valve (500); the energy storage electric heater (300) and the heat exchanger (200) are arranged in the water tank (100), the flow-through electric heater (400) and the thermostatic valve (500) are arranged outside the water tank (100), and the thermostatic valve (500) is connected to an outlet of the heat exchanger (200), the flow-through electric heater (400) and a water inlet (11) of the energy storage heat exchange electric water heater (10); and the control method comprises: preliminarily heating a liquid in the water tank (100) to a first preset temperature value by using the energy storage electric heater (300), and maintaining the temperature; performing heat exchange on a water in the heat exchanger (200) by using the heated liquid in the water tank (100) to obtain a water of the first preset temperature value; acquiring a water flow signal value of the energy storage heat exchange electric water heater (10); judging whether the water flow signal value satisfies a first preset trigger requirement; if the water flow signal value satisfies the first preset trigger requirement, outputting the water of the first preset temperature value in the heat exchanger (200) to the thermostatic valve (500); controlling the flow-through electric heater (400) and the thermostatic valve (500) to be in an activated operating state at the same time, and using the thermostatic valve (500) to mix the water of the first preset temperature value with a cold water inputted from the water inlet (11), to obtain a mixed water; and heating the mixed water outputted by the thermostatic valve (500) to a second preset temperature value by using the flow-through electric heater (400), the second preset temperature value is greater than the first preset temperature value.
  2. The control method for an energy storage heat exchange electric water heater as claimed in claim 1, wherein in a step of judging whether the water flow signal value satisfies the first preset trigger requirement, the control method comprises: judging whether the water flow signal value is greater than a preset water flow value; and if the water flow signal value is greater than the preset water flow value, determining that the water flow signal value satisfies the first preset trigger requirement.
  3. The control method for an energy storage heat exchange electric water heater as claimed in claim 1, wherein before controlling the flow-through electric heater (400) and the thermostatic valve (500) to be in the activated operating state at the same time, the control method further comprises: acquiring an outlet water temperature of the thermostatic valve (500); judging whether the outlet water temperature satisfies a second preset trigger requirement; and if the outlet water temperature satisfies the second preset trigger requirement, controlling the flow-through electric heater (400) and the thermostatic valve (500) to be in the activated operating state at the same time.
  4. The control method for an energy storage heat exchange electric water heater as claimed in claim 3, wherein in a step of judging whether the outlet water temperature satisfies the second preset trigger requirement, the control method comprises: acquiring a preset temperature rise value of the flow-through electric heater (400); determining a temperature difference value between the second preset temperature value and the preset temperature rise value; judging whether the outlet water temperature is greater than or equal to the temperature difference value; and if the outlet water temperature is greater than or equal to the temperature difference value, determining that the outlet water temperature satisfies the second preset trigger requirement.
  5. The control method for an energy storage heat exchange electric water heater as claimed in claim 1, wherein in a step of judging whether the water flow signal value satisfies the first preset trigger requirement, the control method further comprises: if the water flow signal value does not satisfy the first preset trigger requirement, acquiring a water tank temperature in the energy storage heat exchange electric water heater (10); judging whether the water tank temperature in the energy storage heat exchange electric water heater (10) satisfies a third preset trigger requirement; and if the water tank temperature in the energy storage heat exchange electric water heater (10) satisfies the third preset trigger requirement, controlling the energy storage electric heater (300) to be in an activated operating state.
  6. The control method for an energy storage heat exchange electric water heater as claimed in claim 5, wherein in a step of judging whether the water tank temperature in the energy storage heat exchange electric water heater (10) satisfies the third preset trigger requirement, the control method comprises: determining a target set temperature of the energy storage heat exchange electric water heater (10); judging whether the water tank temperature in the energy storage heat exchange electric water heater (10) is less than or equal to the target set temperature; and if the water tank temperature in the energy storage heat exchange electric water heater (10) is less than or equal to the target set temperature, determining that the water tank temperature in the energy storage heat exchange electric water heater (10) satisfies the third preset trigger requirement.
  7. The control method for an energy storage heat exchange electric water heater as claimed in claim 6, wherein in a step of determining the target set temperature of the energy storage heat exchange electric water heater (10), the control method comprises: acquiring an initial set temperature and a hysteresis temperature of the energy storage heat exchange electric water heater (10); and obtaining the target set temperature of the energy storage heat exchange electric water heater (10) on a basis of a difference value between the initial set temperature and the hysteresis temperature.
  8. The control method for an energy storage heat exchange electric water heater as claimed in claim 5, wherein in a step of judging whether the water tank temperature in the energy storage heat exchange electric water heater (10) satisfies the third preset trigger requirement, the control method further comprises: if the water tank temperature in the energy storage heat exchange electric water heater (10) does not satisfy the third preset trigger requirement, controlling the energy storage electric heater (300) to be in an inactive operating state.
  9. A control apparatus for an energy storage heat exchange electric water heater, wherein the control apparatus comprises: an energy storage heat exchange electric water heater (10) and a controller; the controller is configured for executing steps of the control method as claimed in any one of claims 1-8; the energy storage heat exchange electric water heater (10) comprises a water tank (100), a heat exchanger (200), an energy storage electric heater (300), a flow-through electric heater (400), a thermostatic valve (500), a water flow sensor, a first temperature sensor (101) and a second temperature sensor (102); the energy storage electric heater (300) is arranged in the water tank (100); the heat exchanger (200) and the first temperature sensor (101) are arranged in the water tank (100); the second temperature sensor (102) is arranged between the thermostatic valve (500) and the flow-through electric heater (400); the thermostatic valve (500) is connected to an outlet of the heat exchanger (200), the flow-through electric heater (400) and a water inlet (11) of the energy storage heat exchange electric water heater (10); the flow-through electric heater (400) is connected to a water outlet (12) of the energy storage heat exchange electric water heater (10); and an inlet of the heat exchanger (200) is connected to the water inlet (12) of the energy storage heat exchange electric water heater (10).
  10. The control apparatus for an energy storage heat exchange electric water heater as claimed in claim 9, wherein the heat exchanger (200) is a stainless steel heat exchange pipeline or a plate heat exchange structure.

Description

Cross-Reference to Related Application The present invention claims the priority to Chinese Patent Application No. 202411547034.2, filed with the China National Intellectual Property Administration (CNIPA) on November 01, 2024. Technical Field The present invention relates to the technical field of household appliances, and in particular to a control method and apparatus for an energy storage heat exchange electric water heater. Background Currently, for the energy storage heat exchange electric water heater, in order to reduce the consumption during heating by an energy storage electric heater, a flow-through electric heater is introduced into the energy storage heat exchange electric water heater to re-heat water outputted by a thermostatic valve. However, in the heating process, in order to prevent the thermostatic function from being affected by continuous water temperature increase due to the flow-through electric heater, which would result in the thermostatic valve repeatedly performing thermostatic adjustment according to different real-time readings, after the flow-through electric heater is started for heating, the thermostatic function is started after a certain time delay. But this practice increases a time required for a user from heating water to using water, i.e. increasing the user's waiting time. Summary The present invention provides a control method and apparatus for an energy storage heat exchange electric water heater, which is able to reduce a time required for a user from heating water to using water, i.e. shortening the user's waiting time. Some embodiments of the present invention provide a control method for an energy storage heat exchange electric water heater, the energy storage heat exchange electric water heater includes a water tank, an energy storage electric heater, a heat exchanger, a flow-through electric heater and a thermostatic valve; wherein the energy storage electric heater and the heat exchanger are arranged in the water tank, the flow-through electric heater and the thermostatic valve are arranged outside the water tank, and the thermostatic valve is connected to an outlet of the heat exchanger, the flow-through electric heater and a water inlet of the energy storage heat exchange electric water heater; and the control method includes: preliminarily heating a liquid in the water tank to a first preset temperature value by using the energy storage electric heater, and maintaining the temperature;performing heat exchange on a water in the heat exchanger by using the heated liquid in the water tank to obtain a water of the first preset temperature value;acquiring a water flow signal value of the energy storage heat exchange electric water heater;judging whether the water flow signal value satisfies a first preset trigger requirement;if the water flow signal value satisfies the first preset trigger requirement, outputting the water of the first preset temperature value in the heat exchanger to the thermostatic valve;controlling the flow-through electric heater and the thermostatic valve to be in an activated operating state at the same time, and using the thermostatic valve to mix the water of the first preset temperature value with a cold water inputted from the water inlet, to obtain a mixed water; andheating the mixed water outputted by the thermostatic valve to a second preset temperature value by using the flow-through electric heater, wherein the second preset temperature value is greater than the first preset temperature value. In some embodiments, in a step of judging whether the water flow signal value satisfies the first preset trigger requirement, the control method includes: judging whether the water flow signal value is greater than a preset water flow value; andif the water flow signal value is greater than the preset water flow value, determining that the water flow signal value satisfies the first preset trigger requirement. In some embodiments, before controlling the flow-through electric heater and the thermostatic valve to be in the activated operating state at the same time, the control method further includes: acquiring an outlet water temperature of the thermostatic valve;judging whether the outlet water temperature satisfies a second preset trigger requirement; and if the outlet water temperature satisfies the second preset trigger requirement, controlling the flow-through electric heater and the thermostatic valve to be in the activated operating state at the same time. In some embodiments, in a step of judging whether the outlet water temperature satisfies the second preset trigger requirement, the control method includes: acquiring a preset temperature rise value of the flow-through electric heater;determining a temperature difference value between the second preset temperature value and the preset temperature rise value;judging whether the outlet water temperature is greater than or equal to the temperature difference value; andif the outlet w