Electric heating device and control method thereof

Abstract

The invention relates to the technical field of heating equipment, and discloses an electric heating device and a control method thereof. The electric heating device comprises: a housing comprising a mounting cavity; the heating pieces are arranged in the heating cavity at intervals; the temperature sensor is arranged at the water outlet end of the shell; the information input end of the controller is in communication connection with the temperature sensor so as to receive the temperature information output by the temperature sensor; the control output end of the controller is in communication connection with the power supply ends of the multiple heating pieces so as to control the power supply end of each heating piece to be connected or disconnected according to the received temperature information. According to the application, the temperature control precision and the energy utilization rate of the electric heating device can be improved, so that the reliability of the electric heating device is improved.

Description

Technical Field

[0001] This application relates to the technical field of heating devices, for example, to an electric heating device and its control method. Background Art

[0002] Currently, many hot water supply devices, such as electric heating tubes and water heaters, are provided with multiple heat sources for heating simultaneously to improve the heating efficiency. Such electric heating devices usually preset a heating temperature value, such as a target temperature value of -a °C. When the water temperature is lower than the heating temperature value, multiple heat sources are controlled to turn on to heat the water body to achieve hot water supply.

[0003] In the process of implementing the above embodiments, it is found that although multiple heat sources heating synchronously improve the heating efficiency, the temperature control accuracy is low, and it is easy to cause energy waste, so the reliability is relatively low. Specifically, when the difference between the heating temperature value and the target temperature value is small, it will cause multiple heat sources to start and stop frequently, increasing power consumption. And because multiple heat sources heat synchronously, the heating power is large. When the outlet water temperature gradually approaches the target temperature value, it is easy to deviate from the target temperature, resulting in a high outlet water temperature, large fluctuations in the outlet water temperature, and low temperature control accuracy. In summary, the reliability of multiple heat sources heating synchronously is relatively low.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of this application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0006] The embodiments of the present disclosure provide an electric heating device and its control method, which can improve the temperature control accuracy and energy utilization rate of the electric heating device, thereby enhancing the reliability of the electric heating device.

[0007] In some embodiments, an electric heating device is provided, including: a housing including an installation cavity; a plurality of heating elements spaced apart in the heating cavity; a temperature sensor disposed at the water outlet end of the housing; a controller, the information input end of the controller is communicatively connected to the temperature sensor to receive the temperature information output by the temperature sensor; the control output end of the controller is communicatively connected to the power supply ends of the plurality of heating elements to control the conduction or disconnection of the power supply ends of each heating element according to the received temperature information.

[0008] In this embodiment, the control output end of the controller is communicatively connected to the power supply ends of multiple heating elements to control the conduction or disconnection of the power supply ends of each heating element according to the received temperature information, thereby controlling the power supply state of each heating element and achieving independent start and stop of each heating element. By achieving independent start and stop of each heating element, multi-stage heating of the electric heating device is realized, so as to flexibly adjust the heating power of the electric heating device, avoid the outlet water temperature deviating from the target temperature, improve the temperature control accuracy of the electric heating device and avoid unnecessary energy waste. In summary, the electric heating device of the embodiment of the present disclosure has higher reliability.

[0009] Optionally, the electric heating device further includes: a plurality of power supply switches, with opposite ends of the power supply switches electrically connected to the power supply and the power supply end of the heating element respectively; the plurality of power supply switches are arranged in one-to-one correspondence with the plurality of heating elements; wherein, the control output end of the controller is communicatively connected to the plurality of power supply switches to control the conduction or disconnection of each power supply switch according to the received temperature information.

[0010] In this embodiment, the controller is used to generate a control signal to control the conduction or disconnection of the power supply switch. Opposite ends of each power supply switch are electrically connected to the power supply and the corresponding heating element power supply end respectively, thereby realizing independent control of the power supply to a single heating element and improving the flexibility and accuracy of the heating control of the electric heating device.

[0011] Optionally, the electric heating device further includes: a thermostat, the temperature sensing probe of the thermostat is located at the water outlet end in the heating cavity and extends from one side wall of the heating cavity of the housing to the opposite side wall. The control output end of the thermostat is communicatively connected to the power supply ends of the plurality of heating elements, and the thermostat is communicatively connected to the controller.

[0012] In this embodiment, by arranging the temperature sensing probe of the thermostat at the water outlet end of the heating cavity to detect the temperature of the water outlet end of the heating cavity for overheat protection. At the same time, it is ensured that after heating, the outlet water temperature of the electric heating device always remains within a suitable range or a desired range, improving the use comfort of the electric heating device. In addition, by arranging the temperature sensing probe of the thermostat to extend from one side wall of the heating cavity of the housing to the opposite side wall, the contact area between the temperature sensing probe and the surrounding environment is increased, the temperature detection sensitivity of the thermostat is improved, and the use safety and use comfort of the electric heating device are further improved.

[0013] In some embodiments, a control method for an electric heating device is provided. The electric heating device includes a housing and a plurality of heating elements. The housing includes an installation cavity, and the plurality of heating elements are arranged at intervals in the heating cavity. The control method includes: obtaining the outlet water temperature of the electric heating device and the heating duration of the heating elements; obtaining a first temperature difference between the target temperature and the outlet water temperature; determining the target number of heating elements to be turned on according to the first temperature difference and the heating duration, and controlling the corresponding number of heating elements to be turned on; when the first temperature difference is less than or equal to a first temperature difference threshold, controlling all heating elements to be turned off.

[0014] The control method for the electric heating device provided by the embodiments of the present disclosure comprehensively considers the first temperature difference between the target temperature and the outlet water temperature and the heating duration of the heating elements, determines the target number of heating elements to be turned on, and realizes more precise temperature regulation so as to quickly and stably reach the target temperature. In addition, when the first temperature difference is less than or equal to the first temperature difference threshold, it indicates that the first temperature difference is small and the outlet water temperature is already very close to the target temperature. At this time, controlling all heating elements to be turned off and using the residual heat of the heating elements to heat the water body further avoids overheating or energy waste and improves the reliability of the electric heating device.

[0015] Optionally, determining the target number of heating elements to be turned on according to the first temperature difference and the heating duration includes: comparing the first temperature difference with a plurality of temperature difference thresholds, and determining the initial number of heating elements to be turned on according to the comparison result; when the heating duration is less than or equal to a first duration threshold, taking the initial number of heating elements to be turned on as the target number of heating elements to be turned on; when the heating duration is greater than the first duration threshold, correcting the initial number of heating elements to be turned on; taking the corrected initial number of heating elements to be turned on as the target number of heating elements to be turned on.

[0016] In this embodiment, each temperature difference threshold corresponds to the on-off state of one or more heating elements to form a hierarchical control strategy. By comparing the first temperature difference with a plurality of temperature difference thresholds and initially determining the number of heating elements to be turned on according to the comparison result as the initial number of heating elements to be turned on. The initial number of heating elements to be turned on is a quick response to the temperature deviation (i.e., the first temperature difference) between the target temperature and the current outlet water temperature, aiming to make the outlet water temperature quickly approach the target temperature.

[0017] Optionally, the first duration threshold t1 is determined in the following manner: t1 = k×(T o -T i ); where T o represents the outlet water temperature of the electric heating device, T i represents the inlet water temperature of the electric heating device, and k represents an adjustment parameter.

[0018] In this embodiment, by dynamically adjusting the first duration threshold t1, the current heating state and trend of the electric heating device can be more accurately reflected, further improving the regulation accuracy of the heating power of the electric heating device and enhancing the temperature control accuracy of the electric heating device.

[0019] Optionally, correcting the initial opening quantity includes: correcting the initial opening quantity according to the first correction value; or obtaining the rate of change of the temperature difference of the first temperature difference; determining the second correction value of the initial opening quantity according to the rate of change of the temperature difference, and correcting the initial opening quantity according to the second correction value.

[0020] In this embodiment, by correcting the initial opening quantity according to the first correction value, the heating power of the electric heating device is increased, so that the outlet water temperature can approach the target temperature as soon as possible.

[0021] In this embodiment, a correlation relationship between the rate of change of the temperature difference and the second correction value is preset, aiming to slow down or accelerate the adjustment process by decreasing or increasing the second correction value along with the rate of change of the temperature difference, so as to avoid over-adjusting the number of heating elements or reaching the target temperature as soon as possible.

[0022] Optionally, the control method further includes: comparing the first temperature difference with the closing temperature difference threshold; when the first temperature difference is less than or equal to the closing temperature difference threshold, controlling all heating elements to close; wherein, the closing temperature difference threshold is less than the first temperature difference threshold.

[0023] In this embodiment, when the first temperature difference is less than or equal to the first temperature difference threshold and all heating elements are controlled to close, during the process of heating by using the residual heat of the heating elements, the outlet water temperature of the electric heating device can be further monitored, the fluctuation range of the outlet water temperature can be reduced, and the stability of the outlet water temperature can be ensured.

[0024] Optionally, the control method further includes: when the first temperature difference is greater than the closing temperature difference threshold, obtaining the inlet water temperature and the running duration of the electric heating device; when the outlet water temperature is less than or equal to the inlet water temperature and the outlet water temperature is less than the target temperature, or when the outlet water temperature is greater than the inlet water temperature, the running duration is greater than the second duration threshold and the outlet water temperature is less than the target temperature, controlling one heating element to open; when the outlet water temperature is greater than or equal to the target temperature, controlling all heating elements to close.

[0025] In this embodiment, the inlet water temperature and the running duration of the electric heating device are introduced, and in combination with the running state of the electric heating device, the heating power of the electric heating device is further regulated, so that the outlet water temperature is closer to the target temperature and the fluctuation range of the outlet water temperature is reduced.

[0026] Optionally, before obtaining the water outlet temperature of the electric heating device and the heating duration of the heating element, the control method further includes: obtaining the water outlet end temperature of the housing; controlling all the heating elements to turn off when the water outlet end temperature is greater than the temperature safety threshold; and obtaining the water outlet temperature of the electric heating device and the heating duration of the heating element when the water outlet end temperature is less than or equal to the temperature safety threshold.

[0027] In this embodiment, when the water body does not fill the entire heating cavity, by monitoring the water outlet end temperature and comparing it with the temperature safety threshold, it is possible to avoid potential safety hazards caused by the over-dry burning phenomenon of the electric heating device.

[0028] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] One or more embodiments are illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0030] Figure 1 is a schematic structural diagram of an electric heating control device provided by an embodiment of the present disclosure;

[0031] Figure 2 is a schematic structural diagram of an electric heating control device provided by another embodiment of the present disclosure;

[0032] Figure 3 is a schematic diagram of the control principle of an electric heating control device provided by an embodiment of the present disclosure;

[0033] Figure 4 is a schematic diagram of the control principle of an electric heating control device provided by another embodiment of the present disclosure;

[0034] Figure 5 is a schematic structural diagram of a controller provided by an embodiment of the present disclosure;

[0035] Figure 6 is a schematic diagram of a control method of an electric heating device provided by an embodiment of the present disclosure;

[0036] Figure 7 is a schematic diagram of a control method of an electric heating device provided by another embodiment of the present disclosure;

[0037] Figure 8 is a schematic diagram of a control method of an electric heating device provided by another embodiment of the present disclosure.

[0038] REFERENCE SIGNS:

[0039] 1 Electric heating device;

[0040] 10 Housing; 102 Heating chamber; 104 Water outlet end; 106 Water inlet end;

[0041] 20 Heating element; 30 Power supply switch; 40 Power switch; 50 Temperature sensor; 60 Temperature controller; 602 Temperature sensing probe; 70 Water level detection device; 702 Water level sensor; 704 Flow meter;

[0042] 80 Controller; 800 Processor; 801 Memory; 802 Communication interface; 803 Bus;

[0043] 2 Power supply. Specific implementation manner

[0044] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference and illustration only, and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0045] The terms "first", "second", etc. in the description and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0046] In the embodiments of the present disclosure, the orientation or positional relationships indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. are based on the orientation or positional relationships shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and their embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0047] In addition, the terms "arranged", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0048] Unless otherwise specified, the term "plurality" means two or more.

[0049] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0050] The term "and / or" is a description of the association relationship of an object, indicating that three relationships can exist. For example, A and / or B means: the three relationships of A, B, and A and B.

[0051] The term "corresponding" can refer to an association relationship or a binding relationship. A corresponding to B means that there is an association relationship or a binding relationship between A and B.

[0052] It should be noted that, without conflict, the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0053] Combined Figure 1 and Figure 2 As shown, the embodiments of the present disclosure provide an electric heating device 1, including a housing 10, a plurality of heating elements 20, a temperature sensor 50, and a controller 80. The housing 10 includes a heating chamber 102. The plurality of heating elements 20 are arranged at intervals in the heating chamber 102. The temperature sensor 50 is arranged at the water outlet end 104 of the housing 10. The information input end of the controller 80 is communicatively connected to the temperature sensor 50 to receive the temperature information output by the temperature sensor 50. The control output end of the controller 80 is communicatively connected to the power supply ends of the plurality of heating elements 20 to control the conduction or disconnection of the power supply ends of each heating element 20 according to the received temperature information.

[0054] In this embodiment, the housing 10 defines a heating chamber 102 for caching water. The heating element 20 is used to heat the water body. The temperature sensor 50 is used to collect the temperature sensor 50 and transmit the collected temperature information to the controller 80. The information input end of the controller 80 is communicatively connected to the temperature sensor 50 to receive the temperature information output by the temperature sensor 50. The control output end of the controller 80 is communicatively connected to the power supply ends of the plurality of heating elements 20 to control the conduction or disconnection of the power supply ends of each heating element 20 according to the received temperature information, thereby controlling the power supply state of each heating element 20 and realizing the independent start and stop of each heating element 20. By realizing the independent start and stop of each heating element 20, multi-stage heating of the electric heating device 1 is achieved, so as to flexibly adjust the heating power of the electric heating device 1, avoid the outlet water temperature deviating from the target temperature, improve the temperature control accuracy of the electric heating device 1 while avoiding unnecessary energy waste. In summary, the electric heating device 1 of the embodiment of the present disclosure has higher reliability.

[0055] In practical applications, the heating element 20 can be a resistance wire, a ceramic heater, a PTC (positive temperature coefficient) thermistor or other types of electric heating elements. The specific type of the heating element 20 is not limited in this application.

[0056] Optionally, as shown in combination with Figure 1 and Figure 2 shown, the heating element 20 extends along the length direction of the housing 10.

[0057] In this embodiment, by arranging the heating element 20 to extend along the length direction of the housing 10, a uniform heating area is formed in the heating chamber 102 to ensure uniform heating of the water body, avoid the phenomenon of water temperature stratification, and improve the heating efficiency and the stability of the outlet water temperature.

[0058] In some embodiments, as shown in combination with Figure 3 and Figure 4 shown, the plurality of heating elements 20 are connected in parallel. In this embodiment, by connecting the plurality of heating elements 20 in parallel, the independent start and stop of the heating elements 20 can be realized.

[0059] Optionally, as shown in combination with Figures 1 to 4 shown, the electric heating device 1 further includes a plurality of power supply switches 30. The opposite ends of the power supply switch 30 are respectively electrically connected to the power supply 2 and the power supply ends of the heating element 20. The plurality of power supply switches 30 are arranged in one-to-one correspondence with the plurality of heating elements 20. Among them, the control output end of the controller 80 is communicatively connected to the plurality of power supply switches 30 to control the conduction or disconnection of each power supply switch 30 according to the received temperature information.

[0060] Figure 3 and Figure 4 The codes involved in

[0061] Table 1

[0062] Code Meaning Explanation R1 Heating element 1 For heating water R2 Heating element 2 For heating water R3 Heating element 3 For heating water R4 Heating element 4 For heating water R5 Heating element 5 For heating water R6 Heating element 6 For heating water KM0 Power switch For synchronously controlling the start and stop of multiple heating elements KM1 Power supply switch 1 For controlling the start and stop of heating element 1 KM2 Power supply switch 2 For controlling the start and stop of heating element 2 KM3 Power supply switch 3 For controlling the start and stop of heating element 3 KM4 Power supply switch 4 For controlling the start and stop of heating element 4 KM5 Power supply switch 5 For controlling the start and stop of heating element 5 KM6 Power supply switch 6 For controlling the start and stop of heating element 6 K0 Control signal 0 For controlling the conduction or disconnection of the power switch K1 Control signal 1 For controlling the conduction or disconnection of power supply switch 1 K2 Control signal 2 For controlling the conduction or disconnection of power supply switch 2 K3 Control signal 3 For controlling the conduction or disconnection of power supply switch 3 K4 Control signal 4 For controlling the conduction or disconnection of power supply switch 4 K5 Control signal 5 For controlling the conduction or disconnection of power supply switch 5 K6 Control signal 6 For controlling the conduction or disconnection of power supply switch 6 L1 Live wire L1 Live wire of three-phase power supply L2 Live wire L2 Live wire of three-phase power supply L3 Live wire L3 Live wire of three-phase power supply L Live wire Live wire of single-phase power supply N Neutral wire Neutral wire of power supply (three-phase power supply or single-phase power supply)

[0063] The power supply 2 refers to a device or system that provides the required electrical energy for various electrical devices, machines or systems. The power supply 2 can convert other forms of energy (such as chemical energy, mechanical energy, solar energy, wind energy, etc.) into electrical energy, or transform, distribute and regulate the electrical energy in the power grid to meet the power consumption requirements of different devices or systems. In this application, the power supply 2 is used to provide electrical energy for the electric heating device 1.

[0064] In this embodiment, the controller 80 is used to generate a control signal to control the conduction or disconnection of the power supply switch 30. The opposite ends of each power supply switch 30 are respectively electrically connected to the power supply 2 and the power supply terminal of the corresponding heating element 20, thereby realizing independent control of the power supply to a single heating element 20 and improving the flexibility and accuracy of the heating control of the electric heating device 1.

[0065] Optionally, the power supply switch 30 includes an AC contactor. The opposite ends of the AC contactor are respectively electrically connected to the power supply 2 and the power supply terminal of the heating element 20, and a plurality of AC contactors are arranged in one-to-one correspondence with a plurality of heating elements 20. The control output terminal of the controller 80 is communicatively connected to the plurality of AC contactors to control the conduction or disconnection of each AC contactor according to the received temperature information.

[0066] An AC contactor is an electrical component used to control the on-off of large currents, and has characteristics such as large control power, frequent operation, and long service life. In this embodiment, the AC contactor is used as the power supply switch 30 to utilize the characteristics of the AC contactor to improve the reliability of the heating control of the electric heating device 1. In addition, the AC contactor has functions such as short-circuit protection and overload protection. When an abnormality (such as short circuit, overload, etc.) occurs in the heating element 20, the AC contactor can quickly cut off the power supply 2 to prevent the expansion of the fault and ensure the safety of the electric heating device 1. Since each heating element 20 has an independent control circuit, even if a certain heating element 20 fails, it will not affect the normal operation of other heating elements 20.

[0067] In some embodiments, as shown in Figure 1 、 Figure 3 and Figure 4 , the electric heating device 1 further includes a power switch 40. One end of the power switch 40 is electrically connected to the power supply 2, and the other end is electrically connected to one or more power supply switches 30. The control output terminal of the controller 80 is communicatively connected to the power switch 40.

[0068] In this embodiment, the power switch 40 serves as the main switch for supplying power to the entire electric heating device 1. When it is closed, it allows current to flow from the power supply 2 to each power supply switch 30, thereby providing electrical energy to the heating element 20. The controller 80 controls the on / off states of the power switch 40 and the power supply switches 30 by sending control signals, so as to achieve precise control of a single heating element 20 and the entire electric heating device 1. In this embodiment, by setting the power switch 40 as the main switch, an additional safety barrier is provided for the entire electric heating device 1. In an emergency, the controller 80 can quickly cut off the power switch 40, thereby immediately stopping the operation of all heating elements 20, preventing the expansion of faults and protecting the safety of the electric heating device 1.

[0069] In some embodiments, one end of the power switch 40 is electrically connected to the power supply 2, and the other end is electrically connected to a plurality of power supply switches 30. For example, Figure 3 in the case where the power switch 40 is electrically connected to the neutral line N of the power supply 2, the other end thereof is electrically connected to the power supply switch KM4, the power supply switch KM5, and the power supply switch KM6.

[0070] In some embodiments, one end of the power switch 40 is electrically connected to the power supply 2, and the other end is electrically connected to one power supply switch 30. For example, Figure 4 in the case where the power switch 40 is electrically connected to the live wire L, the other end thereof is electrically connected to one power supply switch (KM1, KM2, or KM3).

[0071] Optionally, the power switch 40 includes an AC contactor. One end of the AC contactor is electrically connected to the power supply 2, and the other end is electrically connected to one or more power supply switches 30. The control output end of the controller 80 is communicatively connected to the AC contactor. In this embodiment, the AC contactor is used as the power switch 40 to utilize the characteristics of the AC contactor to improve the reliability and safety of the heating control of the electric heating device 1.

[0072] In some embodiments, as shown in Figure 3 and Figure 4 both the power supply switch 30 and the power switch 40 are AC contactors. For the convenience of understanding this embodiment, the AC contactor corresponding to the power supply switch 30 is named the shunt AC contactor, and the AC contactor corresponding to the power switch 40 is named the main circuit AC contactor. Then in this embodiment, one end of the main circuit AC contactor is electrically connected to the power supply 2, and the other end is electrically connected to one or more shunt AC contactors. The end of the shunt AC contactor far from the main circuit AC contactor is electrically connected to the power supply end of the heating element 20, and a plurality of shunt AC contactors are arranged in one-to-one correspondence with a plurality of heating elements 20. The control output end of the controller 80 is communicatively connected to the main circuit AC contactor and a plurality of AC contactors to control the conduction or disconnection of each AC contactor according to the received temperature information.

[0073] Optionally, the power supply 2 includes a three-phase power supply or a single-phase power supply. The three-phase power supply consists of three AC electromotive forces with the same frequency, equal amplitude, and a phase difference of 120 degrees electrical angle in sequence. In practical applications, the three-phase power supply includes three phase lines (also known as live wires) and one neutral line (or neutral wire). The three-phase power supply has obvious advantages in aspects such as power generation, power transmission and distribution, and the conversion of electrical energy into mechanical energy. The single-phase power supply refers to an AC power supply with only one voltage waveform in the power system. In practical applications, the single-phase power supply is composed of any one phase line (live wire) and the neutral line in the three-phase four-wire AC power supply, with a voltage of 220V. The single-phase power supply has a simple structure, is easy to install, operates stably, and has a relatively low cost.

[0074] In some embodiments, as shown in Figure 3 the power supply 2 includes a three-phase power supply, and the number of power switches 40 is four. One ends of the four power switches 40 are respectively electrically connected to the three phase lines or one neutral line of the three-phase power supply, and the other ends are electrically connected to one or more power supply switches 30.

[0075] In this embodiment, the three-phase power supply is used for power supply to utilize the advantages of the three-phase power supply and improve the power supply efficiency and stability. The phase difference of the three-phase power supply can make the fluctuations of the current and voltage cancel each other out, reducing the line loss and electromagnetic interference in the electric heating device 1. In this embodiment, one end of each power switch 40 is electrically connected to one line (phase line or neutral line) of the three-phase power supply, and the other end is electrically connected to one or more power supply switches 30. In this way, each power switch 40 can independently control the on-off of the current on its corresponding line, realizing the independent start and stop of each phase of the three-phase power supply, and thus achieving precise control of different heating areas or different heating requirements.

[0076] In some embodiments, one end of the power switch 40 is electrically connected to the three phase lines or one neutral line of the three-phase power supply, and the other end is electrically connected to one power supply switch 30. As shown in Figure 3 in the figure, for the power switch 40 electrically connected to the live wire L1, the other end is electrically connected to the power supply switch KM1; for the power switch 40 electrically connected to the live wire L2, the other end is electrically connected to the power supply switch KM2; for the power switch 40 electrically connected to the live wire L3, the other end is electrically connected to the power supply switch KM3.

[0077] In some embodiments, one end of the power switch 40 is electrically connected to the three phase lines or one neutral line of the three-phase power supply, and the other end is electrically connected to multiple power supply switches 30. As shown in Figure 3 in the figure, for the power switch 40 electrically connected to the neutral line N, the other end is electrically connected to the power supply switch KM4, the power supply switch KM5, and the power supply switch KM6.

[0078] In some embodiments, as shown in Figure 4As shown, the power supply 2 includes a plurality of single-phase power supplies. The plurality of single-phase power supplies share a neutral wire. The number of power switches 40 is plural. One end of the power switch 40 is electrically connected to the phase wire or the neutral wire of the single-phase power supply, and the other end is electrically connected to one or more power supply switches 30.

[0079] In this embodiment, the plurality of single-phase power supplies share a neutral wire to simplify the circuit layout, reduce the material cost, and improve the safety and stability of the power supply of the electric heating device 1. In addition, one end of each power switch 40 is electrically connected to the phase wire or the shared neutral wire of the corresponding single-phase power supply, and the other end is electrically connected to one or more power supply switches 30, so that each single-phase power supply can be independently controlled to start and stop, improving the power supply flexibility and safety of the electric heating device 1.

[0080] In some embodiments, one end of the power switch 40 is electrically connected to the phase wire or the neutral wire of the single-phase power supply, and the other end is electrically connected to one power supply switch 30. As Figure 4 shown, for the power switch 40 electrically connected to the live wire L, the other end of each is electrically connected to one power supply switch 30 (KM1, KM2 or KM3).

[0081] In some embodiments, one end of the power switch 40 is electrically connected to the phase wire or the neutral wire of the single-phase power supply, and the other end is electrically connected to a plurality of power supply switches 30. As Figure 4 shown, for the power switch 40 electrically connected to the neutral wire N, the other end is electrically connected to the power supply switch KM4, the power supply switch KM5 and the power supply switch KM6.

[0082] Optionally, as shown in Figure 1 and Figure 2 shown, the electric heating device 1 further includes a thermostat 60. The temperature sensing probe 602 of the thermostat 60 is located at the water outlet end 104 in the heating cavity 102, and extends from one side wall of the heating cavity 102 of the housing 10 to the opposite side wall. The control output end of the thermostat 60 is communicatively connected to the power supply ends of the plurality of heating elements 20, and the thermostat 60 is communicatively connected to the controller 80.

[0083] In this embodiment, by arranging the temperature sensing probe 602 of the thermostat 60 at the water outlet end 104 of the heating cavity 102 to detect the temperature of the water outlet end 104 of the heating cavity 102 for overheat protection. For example, when the temperature sensing probe 602 of the thermostat 60 detects that the temperature exceeds the preset temperature safety threshold, the power supply ends of the plurality of heating elements 20 are controlled to be disconnected to turn off all the heating elements 20, avoiding potential safety hazards caused by overheating. At the same time, by monitoring the temperature of the water outlet end 104 in real time through the temperature sensing probe 602 and controlling the on and off of the power supply ends of the plurality of heating elements 20, it can ensure that after heating, the water outlet temperature of the electric heating device 1 always remains within a suitable range or a desired range, improving the comfort of use of the electric heating device 1.

[0084] In addition, by extending the temperature sensing probe 602 of the thermostat 60 from one side wall of the heating cavity 102 of the housing 10 to the opposite side wall, the contact area between the temperature sensing probe 602 and the surrounding environment is increased, the temperature detection sensitivity of the thermostat 60 is improved, and the use safety and comfort of the electric heating device 1 are further improved.

[0085] In this application, the temperature safety threshold is a specific temperature value. When this temperature value is exceeded, it can be considered that safety hazards are likely to occur, such as scalding users, causing fires, burning out adjacent devices, etc.

[0086] Optionally, as shown in Figure 1 and Figure 2 , the thermostat 60 is communicatively connected to the controller 80 and cooperates with each other to achieve overheat protection. For example, the controller 80 generates a temperature safety threshold and transmits it to the thermostat 60. When the temperature at the water outlet end 104 exceeds the temperature safety threshold, the thermostat 60 controls the power supply terminals of the plurality of heating elements 20 to disconnect, so as to turn off all the heating elements 20 and achieve overheat protection.

[0087] In some embodiments, as shown in Figure 1 , Figure 3 and Figure 4 , the control output terminal of the thermostat 60 is communicatively connected to the power switch 40.

[0088] Optionally, as shown in Figure 2 , the electric heating device 1 further includes a water level detection device 70. The water level detection device 70 is disposed in the housing 10 and is used to detect the water level in the heating cavity 102.

[0089] In this embodiment, the water level detection device 70 is used to detect the water level in the heating cavity 102 to determine whether the water in the heating cavity 102 fills the entire heating cavity 102. When the water does not fill the entire heating cavity 102, it is determined that there is a dry burning phenomenon at a part of the electric heating device 1 (the water outlet end 104 of the electric heating device 1). When the temperature at the water outlet end 104 exceeds the temperature safety threshold, it is determined that there is overheat dry burning at the water outlet end 104 of the electric heating device 1, and there are safety hazards. When the water level detection device 70 detects that the water in the heating cavity 102 does not fill the entire heating cavity 102 and the temperature at the water outlet end 104 of the heating cavity 102 exceeds the temperature safety threshold, it is determined that there are safety hazards in the current electric heating process of the electric heating device 1, the safety detection accuracy of the electric heating device 1 is improved, and thus the use safety level of the electric heating device 1 is improved.

[0090] It should be noted that the specific value of the temperature safety threshold needs to be specifically set according to the actual usage scenario and the electric heating device 1, and the present application does not make any limitations. Exemplarily, when the temperature safety threshold is used for detecting the outlet water temperature and the electric heating device 1 is a water heater, the value of the temperature safety threshold is 50 °C, 55 °C or 60 °C to avoid scalding users due to too high outlet water temperature. When the temperature safety threshold is used for detecting the outlet water temperature and the electric heating device 1 is a water dispenser, the value of the temperature safety threshold is 100 °C, 102 °C or 105 °C to avoid potential health hazards caused by insufficient heating due to too low outlet water temperature. When the temperature safety threshold is used for detecting dry burning, the value of the temperature safety threshold is 70 °C, 80 °C or 90 °C to avoid excessive dry burning and causing fire or device damage.

[0091] In some embodiments, in combination with Figure 2 As shown, the water level detection device 70 includes a water level sensor 702 and / or a flow meter 704. By providing the water level sensor 702 and / or the flow meter 704, the water level inside the heating chamber 102 can be detected to determine whether the water in the heating chamber 102 fills the entire heating chamber 102, so as to determine whether there is a dry burning phenomenon in a part of the electric heating device 1.

[0092] Optionally, in combination with Figure 2 As shown, the water level detection device 70 includes a water level sensor 702. The water level sensor 702 is disposed in the housing 10 and is located inside the heating chamber 102.

[0093] In this embodiment, by disposing the water level sensor 702 inside the heating chamber 102, the water level inside the heating chamber 102 can be detected, so as to determine whether the water in the heating chamber 102 fills the entire heating chamber 102, and further determine whether there is a dry burning phenomenon in a part of the electric heating device 1. Specifically, when the water in the heating chamber 102 fills the entire heating chamber 102, it is determined that there is no dry burning phenomenon in the electric heating device 1. When the water in the heating chamber 102 does not fill the entire heating chamber 102, it is determined that there is a local dry burning phenomenon in the electric heating device 1.

[0094] Optionally, in combination with Figure 2 As shown, the water level sensor 702 is disposed on the side wall of the heating chamber 102 and extends along the water inlet end 106 of the heating chamber 102 towards the water outlet end 104. By extending the water level sensor 702 along the water inlet end 106 of the heating chamber 102 towards the water outlet end 104, the sensitivity and accuracy of water level detection can be improved, and further the sensitivity and accuracy of safety detection of the electric heating device 1 can be improved.

[0095] It should be noted that, depending on the type of the water level sensor 702, its installation method in the heating chamber 102 is different. For the specific installation method of the water level sensor 702 in the heating chamber 102, it needs to be specifically set by technicians according to the actual type of the water level sensor 702, and this application does not make any limitations. Exemplarily, the types of the water level sensor 702 include a float type water level sensor 702, a capacitive water level sensor 702, an ultrasonic water level sensor 702, a pressure type water level sensor 702, etc.

[0096] Optionally, as shown in Figure 2 , the water level detection device 70 includes a flow meter 704. The flow meter 704 is disposed at the water inlet end 106 of the housing 10.

[0097] In this embodiment, by installing the flow meter 704 at the water inlet end 106 of the housing 10, the water flow rate entering the heating chamber 102 is monitored in real time, and then the water level change inside the heating chamber 102 is determined according to the water capacity of the heating chamber 102 (the volume of water that can be accommodated in the heating chamber 102), so as to determine whether the water in the heating chamber 102 fills the entire heating chamber 102, and to realize the judgment of whether there is a dry burning phenomenon in a part of the electric heating device 1.

[0098] In practical applications, the flow meter 704 includes an electromagnetic flow meter 704, an ultrasonic flow meter 704 or a vortex street flow meter 704.

[0099] Optionally, as shown in Figure 2 , the water level detection device 70 includes a water level sensor 702 and a flow meter 704. The water level sensor 702 is disposed in the housing 10 and is located inside the heating chamber 102. The flow meter 704 is disposed at the water inlet end 106 of the housing 10.

[0100] In this embodiment, by installing the water level sensor 702 and the flow meter 704 simultaneously, a comprehensive monitoring of the water level and the water flow state in the heating chamber 102 is realized, the sensitivity and accuracy of the water level detection in the heating chamber 102 are improved, and further the sensitivity and accuracy of the safety detection of the electric heating device 1 are improved.

[0101] Specifically, the average value of the water levels obtained by detecting the water level sensor 702 and the flow meter 704 can be calculated as the final water level information, so as to improve the sensitivity and accuracy of the water level detection in the heating chamber 102.

[0102] Optionally, as shown in Figure 1 , the number of the temperature sensors 50 is multiple. The multiple temperature sensors 50 are communicatively connected to the controller 80. The multiple temperature sensors 50 can be disposed at the water outlet end 104 and / or the water inlet end 106 of the housing 10 as needed, so as to obtain the collected temperature information and transmit the temperature information to the controller 80.

[0103] In practical applications, the controller 80 includes a computer control board or a microcontroller 80.

[0104] Optionally, in combination Figure 5 As shown, the controller 80 includes a processor 800 and a memory 801. Optionally, the controller 80 may further include a communication interface 802 and a bus 803. Among them, the processor 800, the communication interface 802, and the memory 801 can communicate with each other through the bus 803. The communication interface 802 can be used for information transmission. The processor 800 can call the logical instructions in the memory 801 to execute the control method of the electric heating device in the following embodiments.

[0105] In addition, when the logical instructions in the above-mentioned memory 801 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0106] The memory 801, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 800 executes functional applications and data processing by running the program instructions / modules stored in the memory 801, that is, implements the control method of the electric heating device in the following embodiments.

[0107] The memory 801 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 801 may include a high-speed random access memory and may also include a non-volatile memory.

[0108] In combination Figures 1 to 5 For the electric heating device shown, the embodiments of the present disclosure provide a control method for an electric heating device. As Figure 6 shown, the control method includes:

[0109] S601, the processor obtains the outlet water temperature of the electric heating device and the heating duration of the heating element.

[0110] In this embodiment, the outlet water temperature of the electric heating device refers to the temperature of the water flowing out after being heated by the electric heating device. The outlet water temperature can be collected and obtained by a temperature sensor arranged at the water outlet end of the housing, or by a temperature sensing probe of a thermostat, or by calculating the average value of the temperature values collected by the temperature sensor arranged at the water outlet end of the housing and the temperature sensing probe.

[0111] The heating duration of the heating element refers to the duration of the heating operation after the heating element is started. The heating duration of the heating element can be monitored and obtained by a controller communicatively connected to the power supply terminal of the heating element.

[0112] S602, the processor obtains the first temperature difference between the target temperature and the water outlet temperature.

[0113] In this embodiment, the target temperature refers to the temperature of the water body set by the user according to actual needs. The first temperature difference ΔT1 between the water outlet temperature and the target temperature is obtained in the following manner: ΔT1 = T t -T o , where T t represents the target temperature, and T o represents the water outlet temperature of the electric heating device, unit: degree Celsius (°C).

[0114] S603, the processor determines the target number of heating elements to be turned on according to the first temperature difference and the heating duration, and controls the corresponding number of heating elements to be turned on.

[0115] S604, when the first temperature difference is less than or equal to the first temperature difference threshold, the processor controls all heating elements to be turned off.

[0116] In this embodiment, the first temperature difference threshold is a temperature difference specifically set in advance by a technician according to the actual electric heating device. The first temperature difference threshold is used to judge the magnitude of the first temperature difference. Exemplarily, the specific value of the first temperature difference threshold is 4°C, 5°C or 6°C.

[0117] The control method of the electric heating device provided by the embodiments of the present disclosure comprehensively considers the first temperature difference between the target temperature and the water outlet temperature and the heating duration of the heating element, determines the target number of heating elements to be turned on, realizes more precise temperature adjustment, so as to quickly and smoothly reach the target temperature. Compared with the related art where all heating elements are started and stopped synchronously, by dynamically adjusting the target number of heating elements to be turned on, the real-time heating power is adjusted, which can avoid overheating or energy waste, reduce the fluctuation range of the water outlet temperature, and improve the stability and reliability of the water outlet temperature of the electric heating device. In addition, when the first temperature difference is less than or equal to the first temperature difference threshold, it indicates that the first temperature difference is small and the water outlet temperature is already very close to the target temperature. At this time, controlling all heating elements to be turned off and using the residual heat of the heating elements to heat the water body further avoids overheating or energy waste and improves the reliability of the electric heating device.

[0118] Optionally, determining the target number of heating elements to be turned on according to the first temperature difference and the heating duration includes: comparing the first temperature difference with a plurality of temperature difference thresholds, and determining the initial number of heating elements to be turned on according to the comparison result; when the heating duration is less than or equal to the first duration threshold, taking the initial number of heating elements to be turned on as the target number of heating elements to be turned on; when the heating duration is greater than the first duration threshold, correcting the initial number of heating elements to be turned on; taking the corrected initial number of heating elements to be turned on as the target number of heating elements to be turned on.

[0119] In this embodiment, a plurality of temperature difference thresholds are preset. The temperature difference threshold is a temperature difference value specifically set by a technician according to the actual electric heating device. The temperature difference threshold is used to judge the magnitude of the first temperature difference. The plurality of temperature difference thresholds include the first temperature difference threshold described in the above embodiment. Each temperature difference threshold corresponds to the on / off state of one or more heating elements to form a hierarchical control strategy. By comparing the first temperature difference with a plurality of temperature difference thresholds, and initially determining the number of heating elements to be turned on as the initial number of heating elements to be turned on according to the comparison result. The initial number of heating elements to be turned on is a rapid response to the temperature deviation (i.e., the first temperature difference) between the target temperature and the current outlet water temperature, aiming to make the outlet water temperature quickly approach the target temperature.

[0120] Exemplarily, the number of temperature difference thresholds is 6, which are, from small to large, the first temperature difference threshold, the second temperature difference threshold, the third temperature difference threshold, the fourth temperature difference threshold, the fifth temperature difference threshold, and the sixth temperature difference threshold. The number of heating elements is 6. Then when the first temperature difference > the sixth temperature difference threshold, the initial number of heating elements to be turned on is 6; when the sixth temperature difference threshold > the first temperature difference > the fifth temperature difference threshold, the initial number of heating elements to be turned on is 5; when the fifth temperature difference threshold > the first temperature difference > the fourth temperature difference threshold, the initial number of heating elements to be turned on is 4; when the fourth temperature difference threshold > the first temperature difference > the third temperature difference threshold, the initial number of heating elements to be turned on is 3; when the third temperature difference threshold > the first temperature difference > the second temperature difference threshold, the initial number of heating elements to be turned on is 2; when the second temperature difference threshold > the first temperature difference > the first temperature difference threshold, the initial number of heating elements to be turned on is 1.

[0121] Exemplarily, the specific value of the first temperature difference threshold is 4°C, 5°C, or 6°C; the specific value of the second temperature difference threshold is 8°C, 9°C, or 10°C; the specific value of the third temperature difference threshold is 13°C, 14°C, or 15°C; the specific value of the fourth temperature difference threshold is 19°C, 20°C, or 21°C; the specific value of the fifth temperature difference threshold is 25°C, 26°C, or 27°C; the specific value of the sixth temperature difference threshold is 35°C, 36°C, or 37°C.

[0122] In this embodiment, a first duration threshold is preset, and the first duration threshold is used to distinguish the heating stage of the current heating process, such as the early stage and the later stage. When the heating duration is less than or equal to the first duration threshold, it indicates that the electric heating device is in the early stage. At this time, the initial opening quantity is directly used as the target opening quantity to maintain the current heating state. When the heating duration is greater than the first duration threshold, it indicates that the electric heating device is in the later stage, and the initial opening quantity is corrected according to the actual situation to keep the outlet water temperature stable, reduce the fluctuation of the outlet water temperature, and further optimize the energy utilization rate.

[0123] Optionally, the first duration threshold t1 is determined in the following manner: t1 = k × (T o - T i ); where T o represents the outlet water temperature of the electric heating device, T i represents the inlet water temperature of the electric heating device, and k represents an adjustment parameter, k > 0.

[0124] In this embodiment, the inlet water temperature of the electric heating device refers to the temperature of the water body flowing into the electric heating device and not heated by the electric heating device, unit: degree Celsius (°C). The inlet water temperature can be collected and obtained by a temperature sensor arranged at the water inlet end of the housing. The adjustment parameter k refers to the parameter for converting the temperature difference (T o - T i ) between the outlet water temperature and the inlet water temperature and the first duration threshold t1, unit: minute / degree Celsius (min / °C). The adjustment parameter k > 0, that is, the first duration threshold t1 is proportional to the temperature difference (T o - T i ) between the outlet water temperature and the inlet water temperature of the electric heating device. The specific value of the adjustment parameter k needs to be preset by a technician according to the actual electric heating device, and this application does not make a limitation. Exemplarily, the specific value of the adjustment parameter k is 0.1 min / °C, 0.15 min / °C, or 0.2 min / °C.

[0125] In this embodiment, by dynamically adjusting the first duration threshold t1, it is possible to more accurately reflect the current heating state and trend of the electric heating device, further improve the regulation accuracy of the heating power of the electric heating device, and improve the temperature control accuracy of the electric heating device.

[0126] Optionally, correcting the initial opening quantity includes: correcting the initial opening quantity according to the first correction value.

[0127] In this embodiment, a first correction value is preset to correct the initial number of heaters turned on. The first correction value is a natural number greater than 0, and its specific value needs to be preset by a technician according to the actual electric heating device, which is not limited in this application. When the comparison result between the first temperature difference and multiple temperature difference thresholds remains unchanged and the heating duration is greater than the first duration threshold, the initial number of heaters turned on is corrected according to the first correction value to increase the heating power of the electric heating device, so that the outlet water temperature can approach the target temperature as soon as possible. Exemplarily, the value of the first correction value is 1, 2, or 3.

[0128] Optionally, correcting the initial number of heaters turned on includes: obtaining the rate of change of the first temperature difference; determining a second correction value for the initial number of heaters turned on according to the rate of change of the temperature difference, and correcting the initial number of heaters turned on according to the second correction value.

[0129] The rate of change of the first temperature difference reflects the rate of change of the first temperature difference over time, that is, how fast the outlet water temperature changes. In this embodiment, an association relationship between the rate of change of the temperature difference and the second correction value is preset. Exemplarily, the rate of change of the temperature difference is inversely proportional to the second correction value. The aim is to increase or decrease the second correction value with the rate of change of the temperature difference to slow down or accelerate the adjustment process, so as to avoid over-adjusting the number of heating elements or reaching the target temperature as soon as possible.

[0130] Optionally, determining the second correction value for the initial number of heaters turned on according to the rate of change of the temperature difference includes: comparing the rate of change of the temperature difference with a rate-of-change threshold; when the rate of change of the temperature difference is equal to the rate-of-change threshold, determining that the second correction value for the initial number of heaters turned on is 0; when the rate of change of the temperature difference is greater than the rate-of-change threshold, determining that the second correction value for the initial number of heaters turned on is negative; when the rate of change of the temperature difference is less than the rate-of-change threshold, determining that the second correction value for the initial number of heaters turned on is positive.

[0131] In this embodiment, a rate-of-change threshold is preset to evaluate the rate of change of the temperature difference. The specific value of the rate-of-change threshold needs to be preset by a technician according to the actual electric heating device, which is not limited in this application.

[0132] When the rate of change of the temperature difference is equal to the rate-of-change threshold, it means that the current temperature change rate is moderate and there is no need to adjust the initial number of heaters turned on. The second correction value is determined to be 0, that is, the initial number of heaters turned on remains unchanged. When the rate of change of the temperature difference is greater than the rate-of-change threshold, it means that the current temperature change rate is fast, which is likely to cause overshoot of the outlet water temperature and large-scale temperature fluctuations. Therefore, the second correction value is determined to be negative, that is, the number of heaters turned on is reduced to smooth the temperature rise rate. When the rate of change of the temperature difference is less than the rate-of-change threshold, it means that the current temperature change rate is slow and it is likely that the target temperature cannot be reached in time. Therefore, the second correction value is determined to be positive, that is, the number of heaters turned on is increased to improve the heating efficiency.

[0133] In this embodiment, by comparing the rate of change of the temperature difference with the rate-of-change threshold and accordingly determining the sign or magnitude of the second correction value, the electric heating device can accurately respond to the trend and speed requirements of temperature changes, reduce temperature fluctuations and overshoot phenomena, and further improve the stability and accuracy of temperature control.

[0134] Exemplarily, the specific value of the rate-of-change threshold is 10 °C / min, 15 °C / min, or 20 °C / min; when the rate of change of the temperature difference is greater than the rate-of-change threshold, the specific value of the second correction value is -1, -2, or -3; when the rate of change of the temperature difference is less than the rate-of-change threshold, the specific value of the second correction value is 1, 2, or 3.

[0135] Optionally, after using the corrected initial number of activations as the target number of activations, the control method further includes: resetting the heating duration to zero and re-determining the first duration threshold.

[0136] In this embodiment, by resetting the heating duration to zero and re-determining the first duration threshold to eliminate the potential influence of the previous heating duration and the first duration threshold on the control decision, the electric heating device can make decisions based on the latest first duration threshold and the target number of activations, further improving the accuracy and stability of temperature control and reducing temperature fluctuations and overshoot phenomena.

[0137] Combined with Figure 7 As shown, an embodiment of the present disclosure provides another control method for an electric heating device, including:

[0138] S701, the processor obtains the outlet water temperature of the electric heating device and the heating duration of the heating element.

[0139] S702, the processor obtains the first temperature difference between the target temperature and the outlet water temperature.

[0140] S703, the processor determines the target number of activations of the heating element according to the first temperature difference and the heating duration, and controls the corresponding number of heating elements to be activated.

[0141] S704, when the first temperature difference is less than or equal to the first temperature difference threshold, the processor controls all heating elements to be turned off.

[0142] S705, the processor compares the first temperature difference with the turn-off temperature difference threshold.

[0143] Wherein, the turn-off temperature difference threshold is less than the first temperature difference threshold. The turn-off temperature difference threshold is a temperature difference value specifically set by a technician according to the actual electric heating device. The turn-off temperature difference threshold is used to judge the magnitude of the first temperature difference. Exemplarily, the specific value of the turn-off temperature difference threshold is 1 °C, 2 °C, or 3 °C.

[0144] S706, when the first temperature difference is less than or equal to the shutdown temperature difference threshold, the processor controls all heating elements to turn off.

[0145] S707, when the first temperature difference is greater than the shutdown temperature difference threshold, the processor obtains the inlet water temperature and the running duration of the electric heating device.

[0146] In this embodiment, the running duration of the electric heating device refers to the duration of the heating operation after the electric heating device starts to heat the water body. The running duration of the electric heating device can be monitored and obtained by a controller communicatively connected to the power supply terminals of multiple heating elements.

[0147] S708, when the outlet water temperature is less than or equal to the inlet water temperature and the outlet water temperature is less than the target temperature, or when the outlet water temperature is greater than the inlet water temperature, the running duration is greater than the second duration threshold and the outlet water temperature is less than the target temperature, the processor controls one heating element to turn on.

[0148] In this embodiment, the second duration threshold is a duration value preset by a technician according to the actual electric heating device, and the second duration threshold is used to judge the length of time used for heating the water body after the electric heating device starts.

[0149] S709, when the outlet water temperature is greater than or equal to the target temperature, the processor controls all heating elements to turn off.

[0150] The control method of the electric heating device provided by the embodiments of the present disclosure can control all heating elements to turn off when the first temperature difference is less than or equal to the first temperature difference threshold, and further monitor the outlet water temperature of the electric heating device during the heating process using the residual temperature of the heating elements, reduce the fluctuation range of the outlet water temperature, and ensure the stability of the outlet water temperature.

[0151] Specifically, by comparing the first temperature difference with the shutdown temperature difference threshold, since the shutdown temperature difference threshold is less than the first temperature difference threshold, when the first temperature difference is less than or equal to the shutdown temperature difference threshold, it indicates that the first temperature difference continues to decrease and reaches a smaller temperature difference value. At this time, the outlet water temperature is closer to the target temperature, so all heating elements are controlled to turn off to maintain the off state of all heating elements and ensure the stability of the outlet water temperature of the electric heating device.

[0152] When the first temperature difference is greater than the shutdown temperature difference threshold, it indicates that the first temperature difference has not reached the expected smaller temperature difference value. Then, the inlet water temperature and the running duration of the electric heating device are introduced, and the heating power of the electric heating device is further regulated in combination with the operating state of the electric heating device to make the outlet water temperature closer to the target temperature and reduce the fluctuation range of the outlet water temperature.

[0153] Specifically, when the outlet water temperature is less than or equal to the inlet water temperature and the outlet water temperature is less than the target temperature, it indicates that the outlet water temperature has decreased, and the residual temperature of the heating element can no longer heat the water body, but the outlet water temperature cannot meet the user's requirements (target temperature). Therefore, one heating element is controlled to turn on. While restarting one heating element to continue heating the water body, it is avoided that the heating power is too large, resulting in large fluctuations in the outlet water temperature. When the operation duration is greater than the second duration threshold and the outlet water temperature is greater than the inlet water temperature and the outlet water temperature is less than the target temperature, it indicates that although the outlet water temperature has increased, it still cannot meet the user's requirements, and the operation duration of the electric heating device is relatively long. At this time, by restarting one heating element to heat the water body, while improving the heating efficiency of the electric heating device, it is avoided that the heating power is too large, resulting in large fluctuations in the outlet water temperature.

[0154] Optionally, the control method further includes: when the outlet water temperature is greater than the inlet water temperature and the operation duration is less than or equal to the second duration threshold, re-acquire the outlet water temperature and compare the outlet water temperature with the inlet water temperature.

[0155] In this embodiment, when the outlet water temperature is greater than the inlet water temperature, it indicates that the residual temperature of the heating element continuously heats the water body. At this time, re-acquire the outlet water temperature and compare the outlet water temperature with the inlet water temperature to continuously monitor the heating state of the water body by the residual temperature of the heating element.

[0156] Combined with Figure 8 As shown, the embodiments of the present disclosure provide another control method for an electric heating device, including:

[0157] S801, the processor acquires the temperature at the water outlet end of the housing.

[0158] S802, when the temperature at the water outlet end of the housing is greater than the temperature safety threshold, the processor controls all heating elements to turn off.

[0159] S803, when the temperature at the water outlet end of the housing is less than or equal to the temperature safety threshold, the processor acquires the outlet water temperature of the electric heating device and the heating duration of the heating element.

[0160] In this embodiment, the temperature at the water outlet end of the housing refers to the temperature of the housing at the water outlet end of the electric heating device when the water body does not fill the entire heating cavity. The temperature at the water outlet end can be acquired by collecting through a temperature sensor arranged at the water outlet end of the housing when the water body does not fill the entire heating cavity, or by collecting through the temperature sensing probe of the thermostat, or by calculating the average value of the temperature values collected by the temperature sensor arranged at the water outlet end of the housing and the temperature sensing probe.

[0161] S804, the processor determines the target number of heating elements to be turned on according to the first temperature difference and the heating duration, and controls the corresponding number of heating elements to turn on.

[0162] When the first temperature difference is less than or equal to the first temperature difference threshold, the processor controls all heating elements to turn off.

[0163] By using the control method of the electric heating device provided by the embodiments of the present disclosure, when the water body does not fill the entire heating cavity, the temperature at the water outlet end can be monitored and compared with the temperature safety threshold to avoid potential safety hazards caused by over-dry burning of the electric heating device. Specifically, when the temperature at the water outlet end is greater than the temperature safety threshold, all heating elements are controlled to turn off to stop heating. When the water body fills the entire heating cavity or the temperature at the water outlet end drops below the temperature safety threshold, the heating elements are started to heat the water body, thus avoiding over-dry burning and improving the safety of using the electric heating device. When the temperature at the water outlet end is less than or equal to the temperature safety threshold, it indicates that there is no local dry burning in the electric heating device, or the temperature generated at the dry burning part is relatively low and no safety hazard will be caused. At this time, the water outlet temperature of the electric heating device and the heating duration of the heating elements are obtained, and the heating process continues.

[0164] The embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the control method of the above-mentioned electric heating device.

[0165] The technical solution of the embodiments of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, such as: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc, etc., which can store program codes.

[0166] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groupings thereof. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, or apparatus comprising the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0167] The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

[0168] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be described herein again.

[0169] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect coupling or communication connection of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0170] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the blocks can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. Each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. An electric heating device, characterized in that, Comprising: A housing, including an installation cavity; A plurality of heating elements, spaced apart and disposed in the heating cavity; A temperature sensor, disposed at the water outlet end of the housing; A controller, the information input end of the controller is communicatively connected to the temperature sensor to receive the temperature information output by the temperature sensor; the control output end of the controller is communicatively connected to the power supply ends of the plurality of heating elements to control the conduction or disconnection of the power supply ends of each heating element according to the received temperature information.

2. The electric heating device according to claim 1, characterized in that, Further comprising: A plurality of power supply switches, with opposite ends of the power supply switches electrically connected to the power supply and the power supply ends of the heating elements respectively; The plurality of power supply switches are provided in one-to-one correspondence with the plurality of heating elements; Wherein, the control output end of the controller is communicatively connected to the plurality of power supply switches to control the conduction or disconnection of each power supply switch according to the received temperature information.

3. The electric heating device according to claim 1 or 2, characterized in that, Further comprising: A thermostat, the temperature sensing probe of the thermostat is located at the water outlet end in the heating cavity and extends from one side wall of the heating cavity of the housing to the opposite side wall, the control output end of the thermostat is communicatively connected to the power supply ends of the plurality of heating elements, and the thermostat is communicatively connected to the controller.

4. A control method for an electric heating device, characterized in that, The electric heating device includes a housing and a plurality of heating elements, the housing includes an installation cavity, and the plurality of heating elements are spaced apart and disposed in the heating cavity; the control method includes: Obtaining the water outlet temperature of the electric heating device and the heating duration of the heating elements; Obtaining the first temperature difference between the target temperature and the water outlet temperature; Determining the target number of heating elements to be turned on according to the first temperature difference and the heating duration, and controlling the corresponding number of heating elements to be turned on; When the first temperature difference is less than or equal to the first temperature difference threshold, controlling all heating elements to be turned off.

5. The control method according to claim 4, characterized in that Determining the target number of heating elements to be turned on according to the first temperature difference and the heating duration, including: Comparing the first temperature difference with a plurality of temperature difference thresholds, and determining the initial number of heating elements to be turned on according to the comparison result; When the heating duration is less than or equal to the first duration threshold, taking the initial number of heating elements to be turned on as the target number of heating elements to be turned on; When the heating duration is greater than the first duration threshold, correcting the initial number of heating elements to be turned on; taking the corrected initial number of heating elements to be turned on as the target number of heating elements to be turned on.

6. The control method according to claim 5, wherein Determining the first duration threshold t1 in the following manner: t1 = k×(T o - T i ); Among them, T o represents the outlet water temperature of the electric heating device, and T i represents the inlet water temperature of the electric heating device, and k represents the adjustment parameter.

7. The control method according to claim 5, characterized in that Correcting the initial number of heating elements to be turned on, including: Correcting the initial number of heating elements to be turned on according to the first correction value; or, Obtaining the temperature difference change rate of the first temperature difference; determining the second correction value of the initial number of heating elements to be turned on according to the temperature difference change rate, and correcting the initial number of heating elements to be turned on according to the second correction value.

8. The control method according to any one of claims 4 to 7, characterized in that Further comprising: Comparing the first temperature difference with the closing temperature difference threshold; When the first temperature difference is less than or equal to the closing temperature difference threshold, controlling all heating elements to be turned off; Wherein, the closing temperature difference threshold is less than the first temperature difference threshold.

9. The control method according to claim 8, characterized in that, Further comprising: When the first temperature difference is greater than the closing temperature difference threshold, obtaining the inlet water temperature and the operating duration of the electric heating device; When the water outlet temperature is less than or equal to the inlet water temperature and the water outlet temperature is less than the target temperature, or, when the water outlet temperature is greater than the inlet water temperature, the operating duration is greater than the second duration threshold and the water outlet temperature is less than the target temperature, controlling one heating element to be turned on; When the water outlet temperature is greater than or equal to the target temperature, controlling all heating elements to be turned off.

10. The control method according to any one of claims 4 to 7, characterized in that, Before obtaining the water outlet temperature of the electric heating device and the heating duration of the heating elements, the control method further includes: Obtain the temperature at the water outlet end of the housing; When the temperature at the water outlet end is greater than the temperature safety threshold, control all heating elements to turn off; When the temperature at the water outlet end is less than or equal to the temperature safety threshold, obtain the water outlet temperature of the electric heating device and the heating duration of the heating element.

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