WO-2026092458-A1 - CONTROL METHOD AND APPARATUS FOR ENERGY STORAGE AND HEAT EXCHANGE-BASED ELECTRIC WATER HEATER

WO2026092458A1WO 2026092458 A1WO2026092458 A1WO 2026092458A1WO-2026092458-A1

Abstract

The present application relates to the technical field of household appliances, and discloses a control method and apparatus for an energy storage and heat exchange-based electric water heater. The method comprises: preliminarily heating a liquid in a water tank to a first preset temperature value by using an energy storage electric heater, and maintaining the temperature; using the heated liquid in the water tank to exchange heat with water in a heat exchanger to obtain water at the first preset temperature value; acquiring a water flow signal value of an energy storage and heat exchange-based electric water heater; determining 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 at the first preset temperature value in the heat exchanger to a thermostatic valve; controlling a 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 at the first preset temperature value with cold water inputted from a water inlet to obtain mixed water; and heating the mixed water outputted by the thermostatic valve to a second preset temperature value by using the flow-through electric heater. The present application can reduce the time required for a user to use water after turning on a faucet.

Inventors

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

Assignees

广东万家乐燃气具有限公司

Dates

Publication Date: 20260507
Application Date: 20251028
Priority Date: 20241101

Claims (10)

A control method for an energy storage heat exchange electric water heater, wherein 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 disposed inside the water tank, the flow-through electric heater and the thermostatic valve are disposed outside the water tank, and the thermostatic valve is connected to the outlet of the heat exchanger, the flow-through electric heater, and the inlet of the energy storage heat exchange electric water heater; the method includes: The energy storage electric heater is used to initially heat the liquid in the water tank to a first preset temperature value and then maintain the temperature. The heated liquid in the water tank is used to exchange heat with the water in the heat exchanger to obtain water at a first preset temperature value; Obtain the water flow signal value of the energy storage heat exchange electric water heater; Determine whether the water flow signal value meets the first preset triggering requirement; If the water flow signal value meets the first preset triggering requirement, then the water at the first preset temperature value in the heat exchanger will be output to the thermostatic valve. The flow-through electric heater and the thermostatic valve are simultaneously activated. The thermostatic valve is used to mix the water at the first preset temperature value with the cold water input through the inlet to obtain mixed water. The mixed water output from the thermostatic valve is heated to a second preset temperature value using the flow-through electric heater, wherein the second preset temperature value is greater than the first preset temperature value.
According to the control method of the energy storage heat exchange electric water heater according to claim 1, wherein determining whether the water flow signal value meets the first preset triggering requirement includes: Determine whether the water flow signal value is greater than the preset water flow value; If the water flow signal value is greater than the preset water flow value, then the water flow signal value is determined to meet the first preset triggering requirement.
According to the control method of the energy storage heat exchange electric water heater according to claim 1, the method further includes, before controlling the flow-through electric heater and the thermostatic valve to be in the start-up working state simultaneously: Obtain the outlet water temperature of the thermostatic valve; Determine whether the outlet water temperature meets the second preset triggering requirement; If the outlet water temperature meets the second preset triggering requirement, then the flow-through electric heater and the thermostatic valve are simultaneously put into operation.
According to the control method of the energy storage heat exchange electric water heater according to claim 3, the step of determining whether the outlet water temperature meets the second preset triggering requirement includes: Obtain the preset temperature rise value of the overcurrent electric heater; Determine the temperature difference between the second preset temperature value and the preset temperature rise value; Determine whether the outlet water temperature is greater than or equal to the temperature difference value; If the outlet water temperature is greater than or equal to the temperature difference, then the outlet water temperature is determined to meet the second preset triggering requirement.
According to the control method of the energy storage heat exchange electric water heater according to claim 1, the step of determining whether the water flow signal value meets the first preset triggering requirement further includes: If the water flow signal value does not meet the first preset triggering requirement, then the water tank temperature in the energy storage heat exchange electric water heater is obtained; Determine whether the water tank temperature in the energy storage heat exchange electric water heater meets the third preset triggering requirement; If the water tank temperature in the energy storage heat exchange electric water heater meets the third preset triggering requirement, then the energy storage electric heater is controlled to be in the start-up working state.
According to the control method of the energy storage heat exchange electric water heater according to claim 5, wherein determining whether the water tank temperature in the energy storage heat exchange electric water heater meets the third preset triggering requirement includes: Determine the target set temperature of the energy storage heat exchange electric water heater; Determine whether the water tank temperature in the energy storage heat exchange electric water heater is less than or equal to the target set temperature; If the water tank temperature in the energy storage heat exchange electric water heater is less than or equal to the target set temperature, then it is determined that the water tank temperature in the energy storage heat exchange electric water heater meets the third preset triggering requirement.
The control method for an energy storage heat exchange electric water heater according to claim 6, wherein determining the target set temperature of the energy storage heat exchange electric water heater includes: Obtain the initial set temperature and hysteresis temperature of the energy storage heat exchange electric water heater; The target set temperature of the energy storage heat exchange electric water heater is obtained based on the difference between the initial set temperature and the hysteresis temperature.
According to the control method of the energy storage heat exchange electric water heater according to claim 5, the step of determining whether the water tank temperature in the energy storage heat exchange electric water heater meets the third preset triggering requirement further includes: If the water tank temperature in the energy storage heat exchange electric water heater does not meet the third preset triggering requirement, the energy storage electric heater is controlled to be in an off-state.
A control device for an energy storage heat exchange electric water heater, comprising: an energy storage heat exchange electric water heater and a controller, wherein the controller is configured to perform the steps of the method as described in any one of claims 1-8; The energy storage heat exchange electric water heater includes a water tank, a heat exchanger, an energy storage electric heater, a flow-through electric heater, a thermostatic valve, a water flow sensor, a first temperature sensor, and a second temperature sensor. The energy storage electric heater is installed inside the water tank; The heat exchanger and the first temperature sensor are located in the water tank; The second temperature sensor is located between the thermostatic valve and the overflow electric heater; The thermostatic valve is connected to the outlet of the heat exchanger, the flow-through electric heater, and the inlet of the energy storage heat exchange electric water heater. The flow-through electric heater is connected to the outlet of the energy storage heat exchange electric water heater; The inlet of the heat exchanger is connected to the inlet of the energy storage heat exchange electric water heater.
The control device for the energy storage heat exchange electric water heater according to claim 9, wherein the heat exchanger is a stainless steel heat exchange pipeline or a plate heat exchange structure.

Description

Control methods and devices for energy storage heat exchange electric water heaters Technical Field This application relates to the field of household appliance technology, and in particular to a control method and device for energy storage heat exchange electric water heaters. Background Technology Currently, to reduce energy consumption during the heating process of the energy storage electric heater, a flow-through electric heater is introduced into the energy storage heat exchange electric water heater to reheat the water output from the thermostatic valve. However, during the heating process, in order to avoid the thermostatic function from repeatedly adjusting the thermostatic valve based on different real-time readings due to the continuous increase in water temperature caused by the flow-through electric heater, a certain delay is made after the flow-through electric heater starts heating before the thermostatic function is activated. However, this approach increases the time from boiling water to using the water, that is, it increases the user's waiting time. Summary of the Invention This application provides a control method and device for an energy storage heat exchange electric water heater, which can reduce the time from boiling water to using water, that is, shorten the user's waiting time. In a first aspect, this application provides 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. The energy storage electric heater and the heat exchanger are located inside the water tank, while the flow-through electric heater and the thermostatic valve are located outside the water tank. The thermostatic valve is connected to the outlet of the heat exchanger, the flow-through electric heater, and the inlet of the energy storage heat exchange electric water heater. The method includes: The liquid in the water tank is initially heated to the first preset temperature value using an energy storage electric heater and then kept at that temperature. The heated liquid in the water tank is used to exchange heat with the water in the heat exchanger to obtain water at the first preset temperature value; Acquire the water flow signal value of the energy storage heat exchange electric water heater; Determine whether the water flow signal value meets the first preset triggering requirement; If the water flow signal value meets the first preset triggering requirement, the water at the first preset temperature value in the heat exchanger will be output to the thermostatic valve. The flow-through electric heater and the thermostatic valve are simultaneously in the start-up state. The thermostatic valve is used to mix water at the first preset temperature value with cold water input from the inlet to obtain mixed water. The mixed water output from the thermostatic valve is heated to a second preset temperature value using a flow-through electric heater, wherein the second preset temperature value is greater than the first preset temperature value. Secondly, this application provides a control device for an energy storage heat exchange electric water heater, the control device comprising: an energy storage heat exchange electric water heater and a controller, wherein the controller is used to perform the steps of any of the methods described above; The energy storage heat exchange electric water heater includes a water tank, a heat exchanger, an energy storage electric heater, a flow-through electric heater, a thermostatic valve, a water flow sensor, a first temperature sensor, and a second temperature sensor. The energy storage electric heater is installed inside the water tank; The heat exchanger and the first temperature sensor are located in the water tank; The second temperature sensor is located between the thermostatic valve and the overflow electric heater; The thermostatic valve is connected to the outlet of the heat exchanger, the flow-through electric heater, and the inlet of the energy storage heat exchange electric water heater; The flow-through electric heater is connected to the outlet of the energy storage heat exchange electric water heater; The inlet of the heat exchanger is connected to the inlet of the energy storage heat exchange electric water heater. The beneficial effects of this application are as follows: Unlike the prior art, this application controls the flow-through electric heater and the thermostatic valve to be in the starting working state simultaneously. Therefore, the thermostatic valve can mix the cold water with the hot water output from the heat exchanger before it flows through the flow-through electric heater for heating. That is, the flow-through electric heater can directly heat the mixed water output from the thermostatic valve without heating the cold water from the the