CN112178938A - Hybrid power supply control method of electric water heater - Google Patents

Abstract

The invention discloses a hybrid power supply control method of an electric water heater, wherein the electric water heater comprises the following components: the electric heating device comprises an electric storage module for storing electric energy, at least one first electric heating sub-component for heating water by means of power supply of the electric storage module, and at least one second electric heating sub-component for heating water by means of power supply of an external power supply; the control method comprises the following steps: in the process of heating water by electrifying the second electric heating sub-component, if the second electric heating sub-component is in the maximum heating power and the water outlet temperature of the electric water heater is lower than the set water outlet temperature, the current output by the power storage module is subjected to shunting treatment so as to supply power to the corresponding first electric heating sub-component and heat water at the same time. The constant-temperature hot water output is realized, so that the fluctuation range of the output water temperature is reduced, and the user experience is improved.

Description

Hybrid power supply control method of electric water heater

Technical Field

The invention belongs to the technical field of household appliances, and particularly relates to a hybrid power supply control method of an electric water heater.

Background

At present, water heaters are household appliances commonly used in daily life, wherein electric water heaters are widely used due to small volume, and instant water heaters with instant heating function are used by more users due to convenient use. However, due to the current limitation of the household electric wire, the power of the instant water heater is low, and the requirement of a user on large-flow bathing cannot be met. Chinese patent application No. 201811467936. X discloses a low-power battery energy-storage low-voltage instant heating type constant-temperature water-outlet electric water heater system, i.e. a storage battery is used to provide electric energy for an electric heating device for heating, thereby realizing instant heating type water supply, and in order to realize constant-temperature water supply, a constant-temperature shower head is used for realizing constant-temperature water outlet. However, in the actual use process, the fluctuation of the heating amount of the heating device is large under the influence of the power supply current, so that the fluctuation of the water temperature of the heating output is large, the effect of outputting hot water at a constant temperature is poor only by adjusting hot water and cold water through the constant-temperature shower head, and the user experience is poor. The invention aims to solve the technical problem of how to design a technology for outputting hot water at a constant temperature to reduce the fluctuation range of the output water temperature and improve the user experience.

Disclosure of Invention

The invention provides a hybrid power supply control method of an electric water heater, aiming at the technical problems in the prior art, and the hybrid power supply control method can realize constant-temperature output of hot water so as to reduce the fluctuation range of the output water temperature and improve the user experience.

In order to realize the purpose of the invention, the invention is realized by adopting the following technical scheme:

the invention provides a hybrid power supply control method of an electric water heater, wherein the electric water heater comprises the following steps: the electric heating device comprises an electric storage module for storing electric energy, at least one first electric heating sub-component for heating water by means of power supply of the electric storage module, and at least one second electric heating sub-component for heating water by means of power supply of an external power supply;

the control method comprises the following steps: in the process of heating water by electrifying the second electric heating sub-component, if the second electric heating sub-component is in the maximum heating power and the water outlet temperature of the electric water heater is lower than the set water outlet temperature, the current output by the power storage module is subjected to shunting treatment so as to supply power to the corresponding first electric heating sub-component and heat water at the same time.

Further, the electric water heater comprises a plurality of the first electric heating sub-components arranged in parallel; the current output by the power storage module is subjected to shunting treatment, and the shunting treatment specifically comprises the following steps: and controlling the corresponding number of the first electric heating sub-components to be electrified so as to adjust the current output by the power storage module.

Further, the control method specifically comprises the following steps: after the water flow is detected, the heat value required by heating water is calculated according to the detected inlet water temperature, the detected water flow and the set outlet water temperature, and the heating power of the second electric heating element and the heating power of the first electric heating element are adjusted according to the calculated heat value.

Further, the control method further includes: when the outlet water temperature is detected to be higher than the set outlet water temperature value, the heating power of the first electric heating component is reduced, and if the first electric heating component is completely powered off and the outlet water temperature is still higher than the set outlet water temperature value, the heating power of the second electric heating component is reduced; when the detected outlet water temperature is lower than the set outlet water temperature value, the heating power of the second electric heating sub-component is increased, and if the second electric heating sub-component is at the maximum heating power and the outlet water temperature is still lower than the set outlet water temperature value, the heating power of the first electric heating sub-component is increased.

Further, the control method further includes: when the water inlet temperature detected by the first temperature sensor is reduced, the heating power of the second electric heating component is increased through the external power supply discharging module, and if the second electric heating component is at the maximum heating power and the water outlet temperature is still lower than the set water outlet temperature value, the heating power of the first electric heating component is increased through the charging and discharging module; when the temperature of the inlet water detected by the first temperature sensor rises, the heating power of the first electric heating component is reduced through the charging and discharging module, and if the first electric heating component is completely powered off and the outlet water temperature is still larger than the set outlet water temperature value, the heating power of the second electric heating component is reduced through the external power supply discharging module.

Further, the control method further includes: when the detected water flow is reduced, the heating power of the first electric heating component is firstly reduced, and if the first electric heating component is completely powered off and the outlet water temperature is still greater than the set outlet water temperature value, the heating power of the second electric heating component is reduced; when the detected water flow is increased, the heating power of the second electric heating sub-component is increased, and if the second electric heating sub-component is at the maximum heating power and the outlet water temperature is still lower than the set outlet water temperature value, the heating power of the first electric heating sub-component is increased.

Further, the reducing the heating power of the first electric heating sub-assembly specifically includes: reducing the number of energization of the first electrical heating sub-assembly; or at least one first electric heating sub-component in an electrified state is cut off, and at least one first electric heating sub-component in a non-electrified state is selected to be electrified; the heating power of the first electric heating sub-component which is cut off is larger than that of the first electric heating sub-component which is selected to be electrified; the increasing of the heating power of the first electric heating element is specifically as follows: increasing the number of energization of the first electric heater sub-assembly; or at least one first electric heating sub-component in an electrified state is cut off, and at least one first electric heating sub-component in a non-electrified state is selected to be electrified; wherein the heating power of the first electric heating sub-assembly which is cut off is less than the heating power of the first electric heating sub-assembly which is selected to be electrified.

Further, the control method further includes: in the water using process, under the condition that water is started again after water is shut down, when the detected water flow is larger than the set flow value and the detected outlet water temperature is smaller than the set outlet water temperature value, the second electric heating sub-component is controlled to be electrified and heated, and if the second electric heating sub-component is at the maximum heating power and the outlet water temperature is still smaller than the set outlet water temperature value, the corresponding number of first electric heating sub-components are controlled to be electrified.

Further, the control method further includes: and when the detected outlet water temperature is greater than a set high-temperature threshold value, controlling the second electric heating sub-component and the first electric heating sub-component to be completely powered off.

Further, the control method further includes: under the condition that water is firstly started in the bathing process, the second electric heating sub-component is electrified and heated at rated power, and all the first electric heating sub-components are simultaneously controlled to be electrified and heated; and when the set outlet water temperature is higher than the detected outlet water temperature by a difference value smaller than a set temperature difference value, controlling all the first electric heating sub-components to be powered off, and controlling the second electric heating sub-components to be powered on for heating.

Compared with the prior art, the invention has the advantages and positive effects that: the current output by the power storage module is shunted through the charging and discharging module so as to control the current of the first electric heating component, and the second electric heating component is configured to be electrified to heat water, so that the heating power of the electric storage water heater can be controlled more accurately, the purpose of accurately controlling the water outlet temperature is achieved, the range of the water outlet temperature is reduced, and the user experience is improved.

Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a control flow chart of an embodiment of an electric water heater according to the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of an electric water heater according to the present invention;

FIG. 3 is a diagram illustrating the distribution of components within the housing of an embodiment of the electric water heater of the present invention;

FIG. 4 is a schematic structural diagram of an electric heating module in an embodiment of the electric water heater of the present invention;

FIG. 5 is a cross-sectional view of an electric heating module in an embodiment of the electric water heater of the present invention;

FIG. 6 is a schematic view of a partial structure of an electric heating module in an embodiment of the electric water heater of the present invention;

FIG. 7 is a schematic diagram of an electric storage module according to an embodiment of the present invention;

FIG. 8 is an enlarged view of a portion of area A of FIG. 7;

FIG. 9 is a second schematic diagram of the structure of the accumulator module in the embodiment of the electric water heater of the present invention;

FIG. 10 is an enlarged partial view of the area B in FIG. 9;

FIG. 11 is a schematic structural diagram of a main frame in an embodiment of an electric water heater according to the present invention;

FIG. 12 is a graph of heating temperature curves for an embodiment of an electric water heater according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1-4, the water heater of the present embodiment includes a housing 1, an electric heating module 2, an electric storage module 3, a charging and discharging module 4, a controller 5, and an external power discharging module 6. The electric heating module 2, the electric storage module 3, the charging and discharging module 4, the controller 5 and the external power supply discharging module 6 are installed in a casing 1, a water inlet pipe 101 and a water outlet pipe 102 are arranged on the casing 1, the water inlet pipe 101 is connected with an external water supply source (such as a tap water pipe) for introducing cold water, and the water outlet pipe 102 is used for outputting hot water. Wherein the electric heating module 2 comprises: the heating device comprises a heating container 21 and an electric heating component, wherein the heating container 21 is provided with a water inlet 2111 and a water outlet 2112, cold water introduced by a water inlet pipe 101 enters the heating container 21 through the water inlet 2111, the electric heating component is electrified to generate heat to heat water in the heating container 21, and the water in the heating container 21 is heated to form hot water which is then output from a water outlet pipe 102 through the water outlet 2112. The electric heating component is divided into a first electric heating component and a second electric heating component according to different power supply modes, wherein the power storage module 3 supplies power to the first electric heating component, and the external power supply discharging module 6 supplies power to the second electric heating component. In a normal situation, a temperature sensor for detecting temperature and a flow sensor for detecting water flow are disposed on the water heater, and the controller 5 controls the operation of the charge and discharge module 4 according to user-set parameters and signals detected by the relevant sensors.

In the operation process of the water heater, the purpose of constant-temperature water outlet is achieved by reducing the fluctuation range of the outlet water temperature for accurately adjusting the overall heating power. When the water heater is in use, the controller 5 controls the charging and discharging module 4 and the external power supply discharging module 6 to operate according to a set outlet water temperature value input by a user. The method specifically comprises the following steps: in the process of heating the water flowing through the heating container 21 through the second electric heating sub-component, if the second electric heating sub-component is at the maximum heating power and the outlet water temperature of the heating container 21 is lower than the set outlet water temperature, the charging and discharging module 4 divides the current output by the power storage module 3 to supply power to the corresponding first electric heating sub-component, and the water flowing through the heating container is simultaneously heated by the first electric heating sub-component. Specifically, in the process of using hot water by a user, the mains supply is firstly adopted for heating, namely the external power supply discharging module 6 introduces the mains supply to the second electric heating sub-component for electrifying and heating. The control mode of the conventional mains supply instant water heater can be referred to in the mains supply heating process, and is not limited and described herein. When the second electric heating element cannot meet the requirement for heating water as the usage amount of hot water increases, the charging and discharging module 4 is started to supply power to the first electric heating element through the power storage module 3, and the first electric heating element assists in heating to meet the requirement for heating water with a large flow rate. For the charge and discharge module 4, the charge and discharge module 4 divides the current output by the power storage module 3 to supply power to the corresponding first electric heating element, so that different first electric heating elements can obtain currents with different sizes as required, the overall heating power of the water heater can be finely adjusted, the required heating power can be obtained according to the specific water inlet temperature and water flow, and the purpose of accurately controlling the water outlet temperature is achieved. Because the voltage output by the power storage module 3 is constant, the current output by the power storage module 3 is shunted to control different first electric heating components to output different heating powers, and further the heating power of the whole water heater can be dynamically adjusted.

Further, the water inlet flow or the water outlet flow of the electric heating module 2 can be detected through a flow sensor; meanwhile, a first water temperature sensor is configured to detect the inflow water temperature of the water inlet 2111. The first water temperature sensor may be installed at the inlet 2111 of the heating container 21 or on the inlet pipe 101, and the flow sensor may be installed at a position of the inlet pipe 101 or the outlet pipe 102, etc. Thus, parameters such as the flow rate value of the water flow, the water inlet temperature value, and the water outlet temperature (i.e., the set water outlet temperature value) to be reached by the water outlet 2112 can be known, the temperature difference Δ T between the water inlet temperature and the set water outlet temperature value can be used to calculate the mass m of the water flowing into the heating container 21 in unit time according to the flow rate, the specific heat capacity c of the water is a known parameter, and the heat Q1 required for heating the water in unit time can be calculated according to the following formula one. The formula I is as follows: q = cm Δ T. The maximum heating quantity Q0 of the second electric heating sub-component is fixed, and the quantity Q1 of heat required for heating water minus the quantity Q0 of heat generated by the second electric heating sub-component is the quantity Q2 of heat required by the first electric heating sub-component. Meanwhile, according to joule's law, the amount of heat Q2 generated by the first electric heating element is related to the voltage and current output by the power storage module 3, and the voltage U output by the power storage module 3 is constant, according to the formula two: q = UIt, the magnitude of the current I required to be output by the power storage module 3 per unit time t can be calculated, and the number of the first electric heater elements that are involved in heating can be calculated based on the resistance values of the different first electric heater elements. In the actual control process, after the flow sensor detects the water flow, the heat value required for heating water is calculated according to the inlet water temperature detected by the first temperature sensor, the water flow detected by the flow sensor and the set outlet water temperature value, and the charge and discharge module 4 controls the current output by the power storage module 3 according to the calculated heat value.

In the actual control process, after the water outlet temperature of the water heater is set by a user, a water faucet is opened to output hot water outwards. The water heater executes the step S1, that is, the water flow is detected by the flow sensor, and the electric heating module 2 is triggered to be heated by electricity only when the water heater detects that the water flow exists. After detecting the water flow, step S2 is executed, i.e. the external power discharge module 6 controls the second electric heater to be powered on to heat the water flowing through the heating container 21. In the process of heating water by the second electric heating sub-assembly, if the heat generated by the second electric heating sub-assembly cannot heat the water flowing through the heating container 21 to the set outlet water temperature value, step S3 is executed, i.e. the charging and discharging module 4 controls the corresponding number of first electric heating sub-assemblies to be electrified and heated according to the calculated heat value, so that the heating amount can be accurately controlled to meet the requirement that the temperature of the outputted hot water is constant.

The first electric heating sub-components are arranged in parallel; the specific control method is as follows: according to the calculated heat value, the charge and discharge module 4 controls the corresponding number of first electric heating sub-components to be heated by electricity so as to adjust the current output by the power storage module 3. Under the condition that the output voltage of the power storage module 3 is constant, the first electric heating sub-components with different resistance values are connected in parallel, and parallel use of different heating powers is achieved. Meanwhile, the total heating power of the water heater in unit time can be further refined and adjusted by controlling the electrifying time length of the first electric heating sub-component with different resistance values in unit time, and finally the requirement of accurate temperature control to output constant-temperature water is met.

In addition, the electric storage water heater is also provided with a second water temperature sensor for detecting the outlet water temperature of the water outlet 2112; the second water temperature sensor may be installed at the water outlet 2112 of the heating receptacle 21 or on the water outlet pipe 102. In the actual use process, when the outlet water temperature detected by the second water temperature sensor is greater than the set outlet water temperature value, the electrifying quantity of the first electric heating sub-component is reduced through the charging and discharging module, and if the first electric heating sub-component is completely powered off and the outlet water temperature is still greater than the set outlet water temperature value, the heating power of the second electric heating sub-component is reduced through the external power supply discharging module; when the water temperature detected by the second water temperature sensor is lower than the set water temperature value, the heating power of the second electric heating element is increased through the external power supply discharging module, and if the second electric heating element is at the maximum heating power and the water temperature is still lower than the set water temperature value, the electrifying quantity of the first electric heating element is increased through the charging and discharging module. Specifically, the second water temperature sensor can monitor the water outlet temperature of the electric water heater in real time, and the controller 5 compares the set water outlet temperature value adjusted by the user with the water outlet temperature value detected by the second water temperature sensor to further adjust the heating power of the first electric heating element and the second electric heating element, so as to ensure that the fluctuation range of the water outlet temperature is small.

Furthermore, in the process of using hot water, a user has the variation of parameters such as inlet water temperature and water flow, and for this reason, in order to ensure the constancy of outlet water temperature and reduce the temperature fluctuation range, the specific control method is as follows: when the water inlet temperature changes and the water inlet temperature detected by the first temperature sensor is reduced, the heating power of the second electric heating component is increased through the external power supply discharging module 6, and if the second electric heating component is at the maximum heating power and the water outlet temperature is still smaller than the set water outlet temperature value, the heating power of the first electric heating component is increased through the charging and discharging module 4; when the temperature of the inlet water detected by the first temperature sensor rises, the heating power of the first electric heating component is reduced through the charge-discharge module 4, and if the first electric heating component is completely powered off and the outlet water temperature is still larger than the set outlet water temperature value, the heating power of the second electric heating component is reduced through the external power supply discharge module 6. Specifically, in the process of using water, the temperature change of the inlet water will affect the outlet water temperature, especially in the winter environment, the temperature of the water stored in the household water pipe can be about 20 degrees, and the temperature of the outdoor water supply pipe is usually lower and is generally about 10 degrees. Assuming that the set outlet water temperature value adjusted by the user is 40 degrees, the initial temperature of the water entering the heating container 21 is higher by 20 degrees in the process of opening the hot water faucet by the user, and at this time, the heating power of the water heater can meet the requirement that the temperature of the 20-degree cold water is raised to 40 degrees. With the continuous water consumption of the user, the cold water of 20 degrees stored in the indoor water pipe is used up, and the cold water of 10 degrees outdoors flows in; at this time, the current heating power of the water heater cannot meet the requirement of raising the temperature of the 10-degree cold water to 40 degrees, so that the heating power of the second electric heating element needs to be increased, and when the second electric heating element has the maximum heating power, the heating power of the first electric heating element needs to be increased through the charging and discharging module 4, so that the overall heating power is increased. When the overall heating power needs to be reduced, the charging and discharging module 4 is used to reduce the heating power of the first electric heating component, and then the heating power of the second electric heating component is further reduced to save electric energy.

When the water inflow rate changes and the water flow rate detected by a flow sensor is reduced, the heating power of the first electric heating element is reduced through the charge-discharge module 4, and if the first electric heating element is completely powered off and the water outflow temperature is still higher than a set water outflow temperature value, the heating power of the second electric heating element is reduced through the external power supply discharge module 6; when the water flow detected by the flow sensor is increased, the heating power of the second electric heating component is increased through the external power supply discharging module 6, and if the second electric heating component is at the maximum heating power and the outlet water temperature is still lower than the set outlet water temperature value, the heating power of the first electric heating component is increased through the charging and discharging module 4. In particular, in the process of using hot water, when different users use the hot water successively in the same time period, the amount of the used water is changed. When the water consumption is increased, the flow sensor increases the corresponding detected water flow, at the moment, the heating power needs to be increased, the heating power of the second electric heating element can be increased firstly, and under the condition that the second electric heating element is at the maximum heating power, the heating power of the first electric heating element needs to be increased through the charging and discharging module 4, so that the overall heating power is improved. Conversely, when the water consumption is reduced, the flow sensor increases the corresponding detected water flow, and at the moment, the heating power needs to be reduced, then the heating power of the first electric heating component is reduced through the charge and discharge module 4, and the heating power of the second electric heating component is further reduced.

There are various ways to adjust the heating power of the first electric heating element. For example: the total heating power can be adjusted by increasing or decreasing the number of the first electric heater elements in the energized state. The method specifically comprises the following steps: when the heating power of the first electric heating sub-assembly needs to be reduced, the charging and discharging module 4 reduces the electrified number of the first electric heating sub-assembly; when it is necessary to increase the heating power of the first electric heating sub-assembly, the charge and discharge module 4 increases the number of energization of the first electric heating sub-assembly. Or the overall heating power can be adjusted by adjusting the electrification of the first electric heating sub-component with different specifications to participate in heating. The method specifically comprises the following steps: when the heating power of the first electric heating sub-component needs to be reduced, the charging and discharging module 4 cuts off at least one first electric heating sub-component in an electrified state and selects at least one first electric heating sub-component in a non-electrified state to be electrified; the heating power of the first electric heating sub-component which is cut off is larger than that of the first electric heating sub-component which is selected to be electrified. When the heating power of the first electric heating sub-component needs to be increased, the charge-discharge module 4 cuts off at least one first electric heating sub-component in an electrified state and selects at least one first electric heating sub-component in a non-electrified state to be electrified; wherein the heating power of the first electric heating sub-assembly which is cut off is less than the heating power of the first electric heating sub-assembly which is selected to be electrified. Specifically, in the heating process, when the heating amount commonly generated by the plurality of first electric heating sub-assemblies exceeds the heat required by heating water, part of the first electric heating sub-assemblies in the energized heating state can be de-energized, and the first electric heating sub-assemblies with smaller heating power are energized to replace the de-energized first electric heating sub-assemblies with larger heating power; conversely, the first electrical heating sub-assembly of higher power is energized to replace the first electrical heating sub-assembly of lower power that is de-energized. In a specific alternative mode, in the actual use process, a table look-up mode may be used, that is, the heating power of each first electric heating sub-assembly is known and recorded in a table mode, and when the overall heating power needs to be adjusted, a plurality of first electric heating sub-assemblies which are suitably matched and combined may be selected through the table look-up mode to be electrified and heated.

In addition, there is a case where the user stops the water supply for a short time and turns on the hot water tap again to continue using the hot water during the use of the hot water. In this case, the heating container 21 stores heated water, and the temperature of the water stored in the heating container 21 is further increased by the preheating of the first electric heating element, so as to prevent the user from being scalded by the excessively high temperature of the water when the water is turned on again. In the use process of the water heater, when the water is turned on again after the water is turned off, when the water flow detected by the flow sensor is larger than a set flow value and the water outlet temperature detected by the second water temperature sensor is smaller than a set water outlet temperature value, the second electric heating sub-component is controlled to be electrified and heated by the external power supply discharging module 6 according to the calculated heat value, and if the second electric heating sub-component is at the maximum heating power and the water outlet temperature is still smaller than the set water outlet temperature value, the corresponding number of first electric heating sub-components are controlled to be electrified by the charging and discharging module 4. Specifically, when the user uses hot water and turns on the water supply again after the water supply is stopped, on one hand, the water flow sensor detects the water flow to judge whether the water flow meets the water flow requirement for starting electric heating or not so as to avoid the situation that the water is continuously heated because the user does not close the faucet, and on the other hand, the second water temperature sensor detects the water temperature so as to judge whether the water needs to be heated or not according to the water outlet temperature. Namely, under the condition that the water outlet flow is larger than the set flow value and the detected water outlet temperature is lower than the set water outlet temperature value, the heating power of the second electric heating element is increased, or the charging and discharging module 4 controls the power storage module 3 to supply power to the first electric heating element for heating. The magnitude of the set flow value may be set according to a specific usage scenario, for example: in a household environment, the set flow value can be adjusted to be 2.5L/min, while in a commercial environment, such as a hotel or restaurant lamp environment, the set flow value can be further increased, and the water heater of the embodiment does not limit the specific size of the set flow value.

In addition, in the actual water using process, when the outlet water temperature detected by the second water temperature sensor is greater than the set high-temperature threshold, the external power supply discharging module 6 controls the second electric heating element to be powered off, and the charging and discharging module 4 controls the first electric heating element to be powered off. Specifically, the high temperature threshold is set to prevent the user from being scalded due to the overhigh temperature of the outlet water, for example: in general, the temperature of the domestic hot water is not higher than 55 degrees, and the high temperature threshold is 55 degrees. In the use, when the leaving water temperature that second water temperature sensor detected is greater than 55 degrees, then the water heater automatic start prevents scalding the protection function, and at this moment, controller 5 sends the instruction to charge and discharge module 4 and external power supply discharge module 6 to make whole first electric heating element spare and second electric heating element spare be in the outage state, in order to improve and use fail safe nature.

Preferably, in order to rapidly supply hot water for raising the water temperature under the condition of starting water for the first time in the early bathing period of the user, the aim of rapidly supplying hot water is fulfilled. The control method of the water heater further comprises the following steps: under the condition that water is firstly started in the bathing process, the second electric heating sub-component is electrified and heated at rated power, and all the first electric heating sub-components are simultaneously controlled to be electrified and heated; and when the set outlet water temperature is higher than the detected outlet water temperature by a difference value smaller than a set temperature difference value, controlling all the first electric heating sub-components to be powered off, and controlling the second electric heating sub-components to be powered on for heating. Specifically, after the user adjusts the set outlet water temperature of the water heater, when the user opens the shower head or the faucet to use hot water, since the water in the heating container 21 and the water in the outlet pipe are both cold water, the heat Q1 required for heating water calculated according to the inlet water temperature, the water flow rate and the outlet water temperature cannot rapidly output hot water at the required temperature. Therefore, the heating power of the whole electric heating component needs to be additionally increased in the initial starting stage, that is, in this case, the second electric heating sub-component is heated at the rated power, and simultaneously, all the first electric heating sub-components are also electrified and heated. Thus, the water temperature can be quickly raised. And in the water temperature lifting process, the outlet water temperature is gradually close to the set outlet water temperature value, and at the moment, the heating power of the whole electric heating part needs to be reduced. When the set outlet water temperature is higher than the detected outlet water temperature by a difference value smaller than a set temperature difference value, all the first electric heating sub-components are powered off, and only the second electric heating sub-components are powered on for heating. At this time, the first electric heating element preheats the water flowing through the heating container 21, and simultaneously, the second electric heating element is matched to accurately and quickly compensate the heat required by the temperature difference, so that the temperature of the outputted hot water can quickly reach the water temperature value set by the user. After the water temperature adjustment of the initial startup water is finished, the heat quantity Q1 required for heating the water is calculated according to the formula i, and whether the second electric heating sub-assembly is electrified to heat alone or the second electric heating sub-assembly and the first electric heating sub-assembly are matched to heat is selected.

Referring to fig. 12, in the starting phase, the water temperature rapidly rises in a short time due to the large heating power; when the set water temperature value is reached (namely the temperature value represented by the dotted line), the heating power of the whole electric heating part is reduced and the second electric heating part is used for independently heating, so that the water temperature is slowly heated and finally approaches to the set water temperature value. In the using process, the outlet water temperature correspondingly fluctuates in a small temperature range under the change of the water supply pressure, and the temperature difference between the actual outlet water temperature value and the set outlet water temperature value is controlled within the range of 0.5-1 ℃.

The expression entities of the first electric heating element and the second electric heating element can adopt electric heating devices such as an electric heating tube, an electric heating film and the like; the electric storage module 3 stores electric energy by using a plurality of storage batteries, and the storage batteries can be of the existing common battery types, such as lithium batteries or nickel-cadmium batteries, and the embodiment does not limit the specific form of the storage batteries; the charging and discharging module 4 generally has a battery charging unit and a battery discharging unit, the battery charging unit is connected to the commercial power to charge the storage battery according to the requirement, the battery discharging unit is connected to the first electric heating sub-component, the electric energy released by the storage battery is applied to the first electric heating sub-component through the battery discharging unit to supply power to the first electric heating sub-component, the battery charging unit and the battery discharging unit can adopt the conventional forms of a battery charging circuit and a battery discharging circuit, and are not limited herein; the controller 5 is used as a main control component and can control the operation of the electric water heater according to a command mode set by a user, the controller 5 generally comprises a circuit board and a control chip arranged on the circuit board, since the Battery is used to supply power, the controller 5 may be further configured with a Battery Management System (BMS), which is used to monitor the Battery, for example, accurately estimate the State of Charge (SOC) of the power Battery, namely the residual electric quantity of the battery, collects the parameters of voltage, temperature, current and the like of each storage battery in real time in the charging and discharging process, prevents the overcharge or overdischarge phenomenon, and the single storage battery is charged in a balanced manner so as to ensure that each storage battery in the storage module achieves a balanced and consistent state, in addition, the controller 5 may also be configured with a display screen or a display touch screen for a user to check the operation state of the electric water heater.

Based on the technical scheme, optionally, in the process of heating water by the electric heating module 2, the fluctuation range of the water temperature of the output hot water is reduced more effectively. As shown in fig. 4 to 6, the electric heating module 2 includes: heating container 21 and electric heating component, and electric heating component can adopt electric heating film 22, and heating container 21 includes: the water-saving device comprises a base 211, an inner pipe 212, an outer pipe 213 and a plug 214, wherein a water inlet 2111 and a water outlet 2112 are arranged on the base 211; the inner tube 212 is arranged on the base 211, and a nozzle of the inner tube 212 is communicated with the water inlet 2111; the outer tube 213 is sleeved outside the inner tube 212 and is arranged on the base 211, and a nozzle of the outer tube 213 is communicated with the water outlet 2112; the plug 214 seals and plugs the other nozzle of the outer tube 213; a plurality of electrically heated films 22 may be arranged in the axial direction outside the outer tube 213. Specifically, in the actual use process, water enters the outer tube 213 through the water inlet 2111 of the base 211, and during the water flowing in the outer tube 213, the electric heating film 22 heats the water outside the outer tube 213, the water flows along the outer tube 213 to form hot water and enters the inner tube 212, and the water flowing through the inner tube 212 is wrapped by the water flowing in the outer tube 213, so that the heat emitted by the water flowing through the inner tube 212 is absorbed by the water flowing in the outer tube 213, thereby effectively reducing the heat loss and improving the heating efficiency. In addition, the inner pipe 212 and the outer pipe 213 are installed through the base 211, a water flow interlayer formed between the inner pipe 212 and the outer pipe 213 forms a water inlet channel, the inner pipe 212 forms a water outlet channel, water flowing in the water outlet channel is wrapped by water flowing in the water inlet channel, and the flowing process of the water in the inner pipe 212 and the water in the outer pipe 213 exchange heat to a certain extent, so that the thermal deviation of the upstream water and the downstream water is reduced. And, adopt inside and outside sleeve pipe structure, avoid setting up a business turn over water pipe alone, save space, and the inner tube outer wall is the intermediate layer space, and the heat loss that flows through 212 inner tube's water dissipation is utilized, heats the water that flows through inner tube 212 and outer tube 213 intermediate layer, has improved the thermal efficiency, and wherein, the water of inner tube 212 output is not directly heated by electric heating film 22, can effectually reduce the fluctuation of output temperature. The heating power can be adjusted by adjusting the discharge current of the power storage module 3 or adjusting the number of the used electric heating films 22, so that the temperature of the discharged water can be quickly raised to the temperature set by the user.

Preferably, a support plate 215 is further disposed between the inner tube 212 and the outer tube 213, and the inner tube 212 can be stably installed in the outer tube 213 by using the support plate 215, so as to ensure that the thickness of the water flow interlayer formed between the inner tube 212 and the outer tube 213 is uniform. The supporting plate 215 may be a ring-shaped structure, the supporting plate 215 is sleeved outside the inner tube 212, the outer edge of the supporting plate 215 abuts against the inner tube wall of the outer tube 213, and a plurality of supporting plates 215 may be arranged along the axial direction of the inner tube 212 to effectively ensure that the distance between the inner tube 212 and the outer tube 213 is constant. Alternatively, the support plate 215 is a spiral structure as a whole, the support plate 215 is spirally arranged around the outside of the inner tube 212, and the outer edge of the support plate 215 abuts against the inner tube wall of the outer tube 213.

In addition, in order to reduce the occurrence of hot and cold water stratification, the support plate 215 disturbs the water flowing in the outer pipe 213, thereby breaking the boundary layer of water flow, rapidly promoting the mixing of hot and cold water, and further reducing the fluctuation range of the outlet water temperature. Specifically, for the supporting plate 215 having a ring structure, a plurality of water holes (not labeled) are provided on the supporting plate 215, the turbulence of the water flowing in the outer pipe 213 passing through the water gap serves the purpose of mixing cold and hot water, and the supporting plate 215 may be obliquely arranged with respect to the axis of the inner pipe 212 to further guide the water flow by the supporting plate 215 to cause the turbulence. And to helical structure's backup pad 215, its self alright play the purpose that the rotatory vortex that reaches of guide rivers, and backup pad 215's surface is provided with hollow out construction, can more effectual increase vortex effect. Under the turbulent flow effect of the supporting plate 215, the phenomenon of film boiling of the water in the outer tube 213 due to too high heating temperature can be further reduced or avoided. In order to utilize the heat generated by the electric heating film 22 to the maximum and reduce energy consumption, the heat preservation layer is further arranged outside the heating container 21, and the heat preservation layer is used for wrapping the heating container 21 integrally outside, so that the heat loss generated by the electric heating film 22 is reduced, the heat energy utilization rate is improved, and the energy consumption is reduced. Meanwhile, a gap is formed between the pipe orifice of the inner pipe 212 opposite to the choke plug 214 and the choke plug 214, so that the water resistance phenomenon caused by the change of the flow direction of water flow can be effectively reduced.

Based on the above technical solution, optionally, since the power storage module 3 is adopted to supply power to the electric heating component, heat is generated in the charging and discharging processes of the power storage module 3, and in order to improve the heat dissipation efficiency of the power storage module 3, as shown in fig. 7 to 11, the power storage module 3 includes: a plurality of storage batteries 31 and a heat dissipation frame 32, wherein the heat dissipation frame 32 is used for installing the storage batteries 31 and dissipating heat released by the storage batteries 31; the battery 31 is thermally conductively connected to the heat sink 32. Specifically, the heat dissipation frame 32 is used for installing and fixing a plurality of storage batteries 31 on the one hand to make things convenient for the equipment of later stage unification, and on the other hand the heat dissipation frame 32 has the function of giving off storage battery 31 release heat, and the heat dissipation frame 32 can adopt the heat conduction material to make, like metals such as aluminium or copper that heat conductivility is good.

And in order to improve the heat transfer efficiency between battery 31 and the heat dissipation frame 32, battery 31 passes through the sticky subsides of heat conduction glue on heat dissipation frame 32, it is concrete, when assembling battery 31 on heat dissipation frame 32, then utilize heat conduction glue to bond battery 31 on heat dissipation frame 32, on the one hand, heat conduction glue and in the factory assembly process, utilize heat conduction glue can convenient and fast bond battery 31 and assemble on heat dissipation frame 32, in order to improve the packaging efficiency, on the other hand heat conduction glue can play the effect of quick heat conduction, the heat that battery 31 produced passes through the quick transmission of heat conduction glue to heat dissipation frame 32, in order to improve battery 31's heat transfer efficiency, like this, alright in order to utilize the heat that the quick absorption battery 31 of efficient heat dissipation frame 32 produced in order to realize the heat dissipation.

In order to increase the contact area, the storage battery 31 is of a flat structure, the back of the storage battery 31 is attached to the heat dissipation frame 32 through heat conducting glue, the storage battery 31 is of a cuboid structure, and the size of the storage battery 31 in the thickness direction is the minimum. Preferably, in order to mount more batteries 31 by fully utilizing the space on the front and back sides of the heat dissipation frame 32, the batteries 31 may be attached to the front and back sides of the heat dissipation frame 32, respectively, so as to increase the number of the batteries 31 disposed in the entire device and effectively increase the output.

Preferably, in order to more reliably mount the storage battery 31, the heat dissipation frame 32 includes: the main frame body 321 is provided with mounting grooves 3211 on the main frame body 321, and the storage battery 31 is mounted in the corresponding mounting grooves 3211 through heat-conducting glue. Specifically, the main frame 321 is made of a heat conductive material (e.g., aluminum or copper) to ensure that the main frame 321 has good heat conduction and heat dissipation capabilities, the installation grooves 3211 formed on the main frame 321 can independently install the single storage battery 31, and the storage battery 31 can be limited by the bottom and two sides of the installation groove 3211 in the installation groove 3211 to improve the assembly reliability. Therefore, in the later transportation and use process, on one hand, the storage batteries 31 are firmly limited in the mounting grooves 3211, so that the safety and reliability of the storage batteries 31 in the transportation process can be ensured, on the other hand, the storage batteries 31 cannot be mutually extruded and influenced, and the use safety and reliability can be improved. Wherein, still be provided with locating plate 3212 in the mounting groove 3211, locating plate 3212 is used for fixing a position the terminal surface that battery 31 disposed two electrodes, and locating plate 3212 is located and can carry on spacingly to battery 31's upper and lower and left and right sides direction between two electrodes to further improvement equipment reliability.

In order to further improve the reliability of the assembly of the battery 31 and to prevent the battery 31 from falling off during transportation, the main frame 321 is further provided with a connecting frame, and the connecting frame is fastened to the main frame 321 and abuts against the front surface of the battery 31, so that the battery 31 is sandwiched between the connecting frame and the main frame 321. Specifically, in the assembling process, after the battery 31 is bonded to the main frame 321 by the heat conducting adhesive, the battery 31 is limited in the mounting groove 3211 by the connecting frame from the outside of the battery 31, and the battery 31 can be limited in all directions by the limiting effect of the mounting groove 3211, the positioning plate 3212 and the connecting frame. And because polylith battery 31 is the array arrangement on body frame 321, then can carry out unified location installation to the battery 31 that is located same row or same row through the link, more effectual improvement whole packaging efficiency.

The structural form of the connecting frame is different according to the assembling manner of the battery 31 and the main frame 321, and specifically: under the condition that the storage battery 31 is installed on the front surface or the back surface of the main frame body 321, a plurality of first clamping interfaces are also arranged on the main frame body 321; the heat dissipation frame 32 further includes: the first connecting frame is provided with a plurality of first clamping connecting pieces; wherein, first joint connecting piece clamps in first joint interface, and battery 31 presss from both sides between body frame 321 and first link, and is concrete, to under the condition of installing battery 31 on body frame 321 a surface, after battery 31 bonds on body frame 321 through the heat-conducting glue, first joint connecting piece directly clamps in the first joint interface of body frame 321 to accomplish the equipment of first link, battery 31 just presss from both sides between first link and body frame 321, thereby can guarantee that battery 31 can not break away from out from installation recess 3211.

Similarly, when the main frame 321 has the batteries 31 on both the front and back sides, the main frame 321 is further provided with a plurality of through holes 3210; the heat dissipation frame 32 includes: a second connecting frame 322, wherein a plurality of second card interfaces (not marked) are arranged on the second connecting frame 322; the third connecting frame 323 is provided with a plurality of second clamping connecting pieces 3231; the main frame 321 is located between the second connecting frame 322 and the third connecting frame 323, the second clamping connector 3231 passes through the corresponding through hole 3210 and is clamped in the second clamping interface, a part of the storage battery 31 is clamped between the main frame 321 and the second connecting frame 322, and the rest of the storage battery 31 is clamped between the main frame 321 and the third connecting frame 323. Specifically, after the battery 31 is correspondingly attached to the front and the back of the main frame 321 through the heat-conducting adhesive, the second clamping connector 3231 penetrates through the through hole 3210 from one side of the main frame 321 and is clamped into the second clamping interface, and at this time, the second connecting frame 322 and the third connecting frame 323 are both tightly attached to the front of the battery 31, so that the battery 31 is fastened.

In the first and second snap connectors 3231 described above, in order to realize the snap function, taking the second snap connector 3231 as an example, a claw may be formed at the snap end of the second snap connector 3231, and the claw is snapped into the second snap interface to realize the snap connection. Or, the second card connecting member 3231 is integrally a plate-shaped structure, the free end of the plate-shaped structure is provided with a raised elastic card 3232, the elastic card 3232 passes through the second card interface and is clamped at the edge of the second card interface, specifically, the elastic card 3232 is formed at the free end of the second card connecting member 3231 directly by cutting and bending, and the free end of the second card connecting member 3231 can be formed at two sides of the second card connecting member 3232, and the raising direction of the elastic card 3232 at two sides is back to back, so that after the free end of the second card connecting member 3231 is inserted into the second card interface, the elastic card 3232 is compressed into the second card interface first, and then the elastic card 3232 extends out of the second card interface and is elastically restored, and the elastic card 3232 is clamped at the edge of the second card interface.

Further, in order to more efficiently dissipate heat from the battery 31, the power storage module 3 further includes a heat collecting assembly for collecting heat released from the battery 31 by transferring heat through the heat dissipating frame 32. Specifically, the heat that battery 31 charge-discharge in-process produced gives off heat dissipation frame 32 for, and the part heat that heat dissipation frame 32 conducted gives off naturally, and the surplus part heat is then absorbed by the heat collection subassembly, and the heat collection subassembly adopts the endothermic mode of initiative, and high efficiency absorbs the heat more. In order to sufficiently heat water using the heat generated from the battery 31, the heat collecting unit includes: and a cooling water pipe 33, wherein the cooling water pipe 33 is attached to the main frame 321 and connected to the water inlet. Specifically, in the process of starting the electric water heater to generate hot water, cold water input by an external water supply source enters the cooling water pipe 33 through the water inlet pipe 101, the temperature of the cold water flowing through the cooling water pipe 33 is low, the main frame body 321 is heated by heat generated when the storage battery 31 discharges, the heat transfer efficiency between the cold water and the main frame body 321 can be accelerated by utilizing high temperature difference, so that the heat is absorbed quickly, meanwhile, the cold water in the cooling water pipe 33 enters the electric heating module 2 after absorbing the heat, and the cold water is heated by the heat released by the storage battery 31, so that the electricity consumption of the electric heating module 2 can be reduced, the energy consumption is reduced, and the output rate and the output quantity of the hot water are improved; the heat that the in-process of discharging produced is used for preheating the temperature of inlet tube, prevents that the battery temperature from too high, has prolonged battery life, promotes the safety in utilization level of battery, water heater simultaneously, has avoided the waste of the energy of battery, has realized the multistage utilization of energy, improves the water heater efficiency. The cooling water pipe 33 is arranged on the main frame body 321 in a reciprocating bending manner, and the whole body is of a serpentine coil structure, so that the thermal contact area between the cooling water pipe and the main frame body 321 is increased, and the heat dissipation efficiency is accelerated.

In order to conveniently mount the cooling water pipes 33, pipe grooves 3213 which are matched with the cooling water pipes 33 in the extending direction can be formed in the front or back of the main frame body 321, and the cooling water pipes 33 are located in the pipe grooves 3213, so that the contact area between the cooling water pipes 33 and the main frame body 321 is increased to improve the heat transfer efficiency, and meanwhile, the cooling water pipes 33 are located in the pipe grooves 3213 to avoid the extra increase of the overall thickness of the power storage module 3, so as to ensure the light and thin design. Or, a sandwich structure may be formed in the main frame body 321, the cooling water pipes 33 are located in the sandwich structure, the cooling water pipes 33 can uniformly absorb heat released by the storage batteries 31 on both sides of the main frame body 321 in the sandwich structure, and the heat collecting assembly may further include a phase change heat storage material, the phase change heat storage material is filled in the sandwich structure, and the phase change heat storage material can effectively fill the whole sandwich structure to improve the heat dissipation efficiency to the maximum extent. In addition, during the charging process of the electric storage module 3, the heat released by the storage battery 31 can be collected by the phase change heat storage material, so that the water in the cooling water pipe 33 can be preheated by the heat released by the phase change heat storage material in the starting stage of the electric water heater, so as to achieve the effect of rapidly outputting hot water. The heat collecting assembly can collect heat generated by the storage battery 31 in charging and discharging and balanced states, so that the heat of the battery is prevented from being too high, the service life of the battery is prolonged, and the use safety level of the battery and an electric water heater is improved; in addition, the storage battery 31 is used for storing electric energy, the mains supply power failure can be realized when the storage battery 31 discharges, the use safety is effectively improved, the storage battery 31 can meet the requirement of high-power heating, heat preservation is not needed, meanwhile, energy is changed from energy consumption to energy storage through the phase change material, the energy is utilized in multiple stages, the energy waste is reduced, and heating supplement and waiting are not needed when the storage battery is used again.

Based on the technical scheme, the requirements of water and electricity separation are optionally met, and the use reliability and safety of the power storage module 3 are improved. As shown in fig. 1-2, a first mounting cavity 100 and a second mounting cavity 200 are formed in the housing 1; wherein the electric heating module 2 is disposed in the first mounting cavity 100, and the charge and discharge module 4 and the power storage module 3 are disposed in the second mounting cavity 200. Specifically, the electric heating module 2 is used for independently heating water and is placed in the first installation cavity 100, the charging and discharging module 4 and the electric storage module 3 are installed in the second installation cavity 200 to be separated from the electric heating module 2, in the using process, even if the electric heating module 2 heats water and water leaks, the water leaking from the electric heating module 2 only flows into the first installation cavity 100, the charging and discharging module 4 and the electric storage module 3 in the second installation cavity 200 cannot be affected, and the situation that the charging and discharging module 4 or the electric storage module 3 is soaked by water and short circuits occur is avoided.

In order to form two isolated installation cavities in the housing 1, a partition plate 11 may be disposed in the housing 1, the partition plate 11 divides the interior of the housing 1 into a first installation cavity 100 and a second installation cavity 200, specifically, the partition plate 11 is installed in the housing 1 to divide the interior space of the housing 1 into two parts and form the first installation cavity 100 and the second installation cavity 200, water and electricity isolation may be achieved by using the partition plate 11, and when water leaks from the electric heating module 2, water may be blocked by the partition plate 11 to avoid entering the second installation cavity 200. Meanwhile, under the condition of water and electricity isolation, in order to supply power to the electric heating module 2, a wiring hole (not marked) is formed in the partition plate 11, the electric heating module 2 is connected with the charging and discharging module 4 through a power supply cable (not shown), the power supply cable penetrates through the wiring hole, and structures such as a sealing ring and the like can be configured in the wiring hole to further effectively seal a gap between the power supply cable and the wiring hole, so that the sealing performance is further improved. In addition, a heat insulation layer can be further configured on the partition board 11, so that in the power-on working process of the electric heating module 2, heat released to the outside by the electric heating module 2 can be isolated by the partition board 11, and the influence on the charge and discharge module 4 and the power storage module 3 caused by the heat of the electric heating module 2 transferred to the second mounting cavity 200 is avoided.

In the case where the cooling water pipe 33 is used to dissipate heat from the power storage module 3, a mounting hole (not shown) is provided in the partition plate 11, and the cooling water pipe 33 is inserted into the mounting hole, and similarly, a seal ring or the like may be disposed in the mounting hole to further effectively seal the gap between the cooling water pipe 33 and the mounting hole. The connection part of the cooling water pipe 33 and the water inlet pipe 101 is located in the first installation cavity 100, similarly, the connection part of the cooling water pipe 33 and the electric heating module 2 is also located in the first installation cavity 100, and the part of the cooling water pipe 33 located in the second installation cavity 200 is a complete pipe body, so that the influence of water leakage at the connection part of the cooling water pipe 33 on the charge and discharge module 4 and the electric storage module 3 in the second installation cavity 200 is avoided.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A hybrid power supply control method of an electric water heater is characterized by comprising the following steps: the electric heating device comprises an electric storage module for storing electric energy, at least one first electric heating sub-component for heating water by means of power supply of the electric storage module, and at least one second electric heating sub-component for heating water by means of power supply of an external power supply;

the control method comprises the following steps: in the process of heating water by electrifying the second electric heating sub-component, if the second electric heating sub-component is in the maximum heating power and the water outlet temperature of the electric water heater is lower than the set water outlet temperature, the current output by the power storage module is subjected to shunting treatment so as to supply power to the corresponding first electric heating sub-component and heat water at the same time.

2. The hybrid power supply control method of an electric water heater according to claim 1, wherein the electric water heater includes a plurality of the first electric heating sub-components arranged in parallel;

the current output by the power storage module is subjected to shunting treatment, and the shunting treatment specifically comprises the following steps: and controlling the corresponding number of the first electric heating sub-components to be electrified so as to adjust the current output by the power storage module.

3. The hybrid power supply control method of the electric water heater according to claim 1, wherein the control method specifically comprises:

after the water flow is detected, the heat value required by heating water is calculated according to the detected inlet water temperature, the detected water flow and the set outlet water temperature, and the heating power of the second electric heating element and the heating power of the first electric heating element are adjusted according to the calculated heat value.

4. The hybrid power supply control method of an electric water heater according to claim 1, further comprising:

when the outlet water temperature is detected to be higher than the set outlet water temperature value, the heating power of the first electric heating component is reduced, and if the first electric heating component is completely powered off and the outlet water temperature is still higher than the set outlet water temperature value, the heating power of the second electric heating component is reduced;

when the detected outlet water temperature is lower than the set outlet water temperature value, the heating power of the second electric heating sub-component is increased, and if the second electric heating sub-component is at the maximum heating power and the outlet water temperature is still lower than the set outlet water temperature value, the heating power of the first electric heating sub-component is increased.

5. The hybrid power supply control method of an electric water heater according to claim 1, further comprising:

when the water inlet temperature detected by the first temperature sensor is reduced, the heating power of the second electric heating component is increased through the external power supply discharging module, and if the second electric heating component is at the maximum heating power and the water outlet temperature is still lower than the set water outlet temperature value, the heating power of the first electric heating component is increased through the charging and discharging module;

when the temperature of the inlet water detected by the first temperature sensor rises, the heating power of the first electric heating component is reduced through the charging and discharging module, and if the first electric heating component is completely powered off and the outlet water temperature is still larger than the set outlet water temperature value, the heating power of the second electric heating component is reduced through the external power supply discharging module.

6. The hybrid power supply control method of an electric water heater according to claim 1, further comprising:

when the detected water flow is reduced, the heating power of the first electric heating component is firstly reduced, and if the first electric heating component is completely powered off and the outlet water temperature is still greater than the set outlet water temperature value, the heating power of the second electric heating component is reduced;

when the detected water flow is increased, the heating power of the second electric heating sub-component is increased, and if the second electric heating sub-component is at the maximum heating power and the outlet water temperature is still lower than the set outlet water temperature value, the heating power of the first electric heating sub-component is increased.

7. The hybrid power supply control method for the electric water heater according to any one of claims 4-6, wherein the reducing of the heating power of the first electric heating sub-assembly is specifically as follows: reducing the number of energization of the first electrical heating sub-assembly; or at least one first electric heating sub-component in an electrified state is cut off, and at least one first electric heating sub-component in a non-electrified state is selected to be electrified; the heating power of the first electric heating sub-component which is cut off is larger than that of the first electric heating sub-component which is selected to be electrified;

the increasing of the heating power of the first electric heating element is specifically as follows: increasing the number of energization of the first electric heater sub-assembly; or at least one first electric heating sub-component in an electrified state is cut off, and at least one first electric heating sub-component in a non-electrified state is selected to be electrified; wherein the heating power of the first electric heating sub-assembly which is cut off is less than the heating power of the first electric heating sub-assembly which is selected to be electrified.

8. The hybrid power supply control method of an electric water heater according to claim 1, further comprising:

in the water using process, under the condition that water is started again after water is shut down, when the detected water flow is larger than the set flow value and the detected outlet water temperature is smaller than the set outlet water temperature value, the second electric heating sub-component is controlled to be electrified and heated, and if the second electric heating sub-component is at the maximum heating power and the outlet water temperature is still smaller than the set outlet water temperature value, the corresponding number of first electric heating sub-components are controlled to be electrified.

9. The hybrid power supply control method of an electric water heater according to claim 1, further comprising: and when the detected outlet water temperature is greater than a set high-temperature threshold value, controlling the second electric heating sub-component and the first electric heating sub-component to be completely powered off.

10. The hybrid power supply control method of an electric water heater according to claim 1,

the control method further comprises the following steps:

under the condition that water is firstly started in the bathing process, the second electric heating sub-component is electrified and heated at rated power, and all the first electric heating sub-components are simultaneously controlled to be electrified and heated;

and when the set outlet water temperature is higher than the detected outlet water temperature by a difference value smaller than a set temperature difference value, controlling all the first electric heating sub-components to be powered off, and controlling the second electric heating sub-components to be powered on for heating.

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