Instant electric water heater and control method thereof

Abstract

The invention relates to the technical field of electric water heaters, in particular to an instant electric water heater and a control method thereof.The instant electric water heater comprises a shell, a heating element, a water outlet valve, a controller, a water inlet and a water outlet; the shell is provided with an installation space, the heating element is installed in the installation space, the water outlet valve is arranged at the water outlet, the heating element is located between the water inlet and the water outlet and connected through a water pipe, bypass pipes are connected to the two ends of the heating element in parallel, a water storage tank and a circulating pump are sequentially connected to the bypass pipes, and the controller is electrically connected with the circulating pump; when the water outlet valve is closed, the controller controls the circulating pump to start so that the water storage tank, the circulating pump, the heating element and a water path flowing through the three form a circulating water path. Compared with the prior art, it is ensured that each section of retained water in the pipeline is covered with low-temperature water in the water storage tank through forced circulation, the hidden danger that high-temperature water suddenly flows out when a user opens the valve again is fundamentally eliminated, and therefore the safety guarantee of instant stopping and instant cooling is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of electric water heaters, and in particular to an instant electric water heater and a control method thereof. Background Art

[0002] Existing instant electric water heaters generally use overflow-type cast aluminum heaters. When water flows through the heater, the water temperature is heated to obtain hot water. However, its core defect is the temperature rise phenomenon when the water is cut off: when the user closes the water outlet valve, although the cast aluminum heater stops working, the high-temperature residual heat stored inside it will continue to heat the water retained in the pipeline, causing the water temperature in the pipeline to rise by 10K-30K; if the user opens the water outlet valve again within a short period of time, the high-temperature retained water will flow out directly, posing a risk of scalding. Summary of the Invention

[0003] The present application provides an instant electric water heater and a control method thereof to solve the technical problem that in existing instant electric water heaters, due to the phenomenon of temperature rise when the water is cut off, the user opens the water outlet valve again within a short period of time, and the high-temperature retained water flows out directly, posing a risk of scalding.

[0004] In a first aspect, the present application provides an instant electric water heater, comprising: a housing, a heating element, a water outlet valve, a controller, a water inlet, and a water outlet;

[0005] The housing is provided with an installation space, the heating element is installed in the installation space, the water outlet valve is provided at the water outlet, the heating element is located between the water inlet and the water outlet and is connected by a water pipe, bypass pipes are connected in parallel at both ends of the heating element, a water storage tank and a circulation pump are connected to the bypass pipes in sequence, and the controller is electrically connected to the circulation pump;

[0006] When the water outlet valve is closed, the controller controls the circulation pump to start so that the water storage tank, the circulation pump, the heating element and the water path flowing through the three form a circulating water path.

[0007] Furthermore, the circulation pump is a bidirectional circulation pump, which drives the water flow from the water storage tank to the heating element during forward circulation, and drives the water flow from the heating element to the water storage tank during reverse circulation.

[0008] Furthermore, the inner diameter of the bypass pipe is 2.5-6.5 mm, and the inner diameter of the water pipe is 10-20 mm.

[0009] Furthermore, a temperature sensor is provided between the water outlet valve and the heating element, and a water flow sensor is provided at the water inlet.

[0010] Furthermore, a partition plate is provided inside the shell, which divides the installation space into independent water channel cavity and electrical cavity. The heating element, water pipe and bypass pipe are located in the water channel cavity, and the controller and the driving circuit of the circulation pump are located in the electrical cavity. A waterproof sealing ring is provided on the partition plate.

[0011] In a second aspect, the present application further provides a method for controlling an instant electric water heater, the method comprising the following steps:

[0012] Detecting the water flow rate and activating the heating element when the water flow rate is greater than or equal to a preset flow threshold;

[0013] When the water flow rate is less than a preset flow threshold, the heating element is turned off, and the circulation pump is started after a first preset time delay;

[0014] The cold water in the water storage tank is driven by a circulating pump to circulate and replace the hot water in the heating element pipeline;

[0015] The circulation pump is turned off when the circulation pump stop condition is met.

[0016] Furthermore, the stopping condition of the circulation pump is: the circulation time of the circulation pump is greater than or equal to the preset circulation time, and / or the water temperature inside the heating element is less than or equal to the preset temperature threshold.

[0017] Furthermore, the control method of the instant electric water heater further includes the following steps:

[0018] monitoring the surface temperature of the heating element in real time;

[0019] When it is detected that the surface temperature exceeds a first temperature threshold, controlling the circulation pump to operate at maximum power and turning off the heating element;

[0020] If the surface temperature has not dropped below the second temperature threshold after the circulation pump has been running for a second preset time, an alarm signal is triggered and the main power supply is cut off.

[0021] Furthermore, the control method of the instant electric water heater further includes the following steps:

[0022] Detect ambient temperature and water inlet temperature;

[0023] Dynamically adjust the operating power of the circulation pump according to the difference between the ambient temperature and the water inlet temperature;

[0024] When the temperature difference is less than the preset temperature difference, reduce the circulation pump speed and extend the circulation time.

[0025] The above technical solution provided by this application has the following advantages compared with the existing technology:

[0026] This application effectively solves the problem of temperature rise after water outage by actively starting the internal circulation water circuit to replace the residual heat after the water supply is cut off: when the water outlet valve is closed, the controller starts the circulation pump to drive the cold water in the water storage tank and the high-temperature retained water in the heating element pipeline to circulate and replace. The cold water absorbs the residual heat released by the cast aluminum heater, so that the water temperature in the pipeline quickly drops to the safety threshold after the water supply is cut off. Compared with the existing technology that only relies on natural cooling of residual heat or local mixing of cold water, this application ensures that every section of retained water in the pipeline is covered by low-temperature water in the water storage tank through forced circulation, eliminating the hidden danger of high-temperature water suddenly flowing out when the user opens the valve again, thereby achieving the safety guarantee of cooling immediately after the water supply is cut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0030] Figure 1 A schematic structural diagram of an instant electric water heater provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the water path structure of an instant electric water heater provided in an embodiment of the present application when in water use;

[0032] Figure 3 A schematic diagram of the water path structure of an instant electric water heater provided in an embodiment of the present application when the water supply is cut off;

[0033] Figure 4 A schematic diagram of the circulating water circuit structure of a circulating pump in an instant electric water heater provided in an embodiment of the present application in forward and reverse rotation states;

[0034] Figure 5 A control logic flow chart of an instant electric water heater in a water use scenario provided by an embodiment of the present application;

[0035] Figure 6The control logic flow of the internal circulation system of an instant electric water heater in a water outage scenario provided in the embodiment of the present application Figure 1 ;

[0036] Figure 7 The control logic flow of the internal circulation system of an instant electric water heater in a water outage scenario provided in the embodiment of the present application Figure 2 ;

[0037] Figure 8 A flow chart of a control method for an instant electric water heater provided in an embodiment of the present application Figure 1 ;

[0038] Figure 9 A flow chart of a control method for an instant electric water heater provided in an embodiment of the present application Figure 2 ;

[0039] Figure 10 A flow chart of a control method for an instant electric water heater provided in an embodiment of the present application Figure 3 ;

[0040] Figure 11 A schematic block diagram of a computer device provided in an embodiment of the present application.

[0041] Description of reference numerals:

[0042] 1. Housing; 11. Heating element; 12. Water outlet valve; 13. Controller; 14. Water pipe; 141. Water inlet; 142. Water outlet; 15. Bypass pipe; 151. Water storage tank; 152. Circulation pump; 16. Temperature sensor; 17. Water flow sensor. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0045] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures, such as "inside," "outside," "inside," "outside," "below," "beneath," "above," "above," "front," "back," and the like. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a positional flip or a change in posture or a change in motion, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will subsequently be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0046] In order to solve the technical problem that in existing instant electric water heaters, due to the phenomenon of temperature rise when the water is stopped, the user opens the water outlet valve 12 again in a short time, and the high-temperature retained water will flow out directly, posing a risk of scalding, the present application provides an instant electric water heater and a control method thereof, which ensures that each section of retained water in the pipeline is covered by the low-temperature water in the water storage tank 151 through forced circulation, thereby eliminating the hidden danger of high-temperature water suddenly flowing out when the user opens the valve again, thereby achieving the safety guarantee of instant cooling when the water is stopped.

[0047] See also Figures 1 to 4 An instant electric water heater provided by an embodiment of the present application includes: a shell 1, a heating element 11, a water outlet valve 12, a controller 13, a water inlet 141 and a water outlet 142; the shell 1 is provided with an installation space, the heating element 11 is installed in the installation space, the water outlet valve 12 is provided at the water outlet 142, the heating element 11 is located between the water inlet 141 and the water outlet 142 and is connected by a water pipe 14, a bypass pipe 15 is connected in parallel at both ends of the heating element 11, a water storage tank 151 and a circulation pump 152 are connected to the bypass pipe 15 in sequence, and the controller 13 is electrically connected to the circulation pump 152; when the water outlet valve 12 is closed, the controller 13 controls the circulation pump 152 to start so that the water storage tank 151, the circulation pump 152, the heating element 11 and the water path flowing through the three form a circulating water path.

[0048] Specifically, bypass pipes 15 are arranged in parallel at both ends of the main water channel of the heating element 11, and the water storage tank 151 and the circulation pump 152 are connected in series on the bypass pipe 15 according to the direction of water flow, forming a closed branch independent of the main water channel; when the outlet valve 12 (such as a mixing valve or a ball valve) is closed, the controller 13 triggers the circulation pump 152 to start, driving the cold water in the water storage tank 151 to flow through the circulation pump 152, the heating element 11 pipeline and the water storage tank 151 in turn, forming a circulating flow; during normal water use, the water flow is heated and output through the main water channel, where the water flow of the main water channel is much larger than the water flow of the branch water channel, and the water flow flows to the branch and the water channel where the heating element 11 is located, and then merges into the main channel, and the branch water flow does not affect the temperature of the main water flow; when the water supply is cut off, the circulation pump 152 forces the branch water flow to circulate. The circulation pump 152 drives the cold water to circulate in the closed branch to neutralize the temperature of the water retained in the internal pipes of the heating element 11. At the same time, it can also directly absorb the residual heat in the internal pipes of the heating element 11 to prevent the residual heat from heating the retained water and thus scalding the user.

[0049] Furthermore, the heating element 11 in this embodiment is an overflow cast aluminum heater, which is installed on the main water channel between the water inlet 141 and the water outlet 142. The water flows directly through its internal pipe and is heated. The pipe is spirally arranged and has an electric heat conversion component (such as a resistance wire or an electric heating film) inside. The heating power is adjusted by the controller 13.

[0050] like Figure 1 and Figure 4 As shown, the circulation pump 152 is a bidirectional circulation pump 152, which drives water to flow from the water tank 151 to the heating element 11 during forward circulation, and drives water to flow from the heating element 11 to the water tank 151 during reverse circulation.

[0051] Specifically, the bidirectional circulation pump 152 is connected to the water tank 151 and the heating element 11 through pipelines, forming a closed-loop water circuit capable of bidirectional flow. During forward circulation, the water flow path is the water tank 151, the circulation pump 152, the heating element 11, and the water tank 151. During reverse circulation, the water flow path is the heating element 11, the circulation pump 152, the water tank 151, and the heating element 11. When the outlet valve 12 is closed, the controller 13 switches the forward and reverse operation modes of the circulation pump 152 according to preset conditions (such as time or temperature thresholds). The forward circulation is used to inject cold water from the water tank 151 into the heating element 11 pipeline to absorb excess heat, and the reverse circulation is used to pump high-temperature water from the end of the heating element 11 back to the water tank 151. The water flow direction is switched by a reversing valve inside the bidirectional circulation pump 152 or by reversing the motor, and is synchronously controlled by the controller 13. The bidirectional circulation breaks the path dependence of the unidirectional flow, and forces the water flow to alternately flush different sections of the heating element 11 pipeline, thereby avoiding the local residual heat caused by the unidirectional circulation.

[0052] In one embodiment, the inner diameter of the bypass pipe 15 is 2.5-6.5 mm, and the inner diameter of the water pipe 14 is 10-20 mm.

[0053] Specifically, bypass pipe 15, a thin tube with an inner diameter of 2.5-6.5mm, is connected in parallel to water pipe 14 in the main waterway, which has an inner diameter of 10-20mm. The two ends of bypass pipe 15 are connected to the main waterway inlet and outlet of heating element 11, respectively, forming a dual-channel structure of main and bypass waterways. The thin inner diameter of bypass pipe 15 limits its flow rate, ensuring that during normal water use, the majority of water flows preferentially through the main waterway (the thicker tube) to maintain normal heating efficiency, while a small portion flows to water storage tank 151 to store cooling water for the circulating waterway. When the water circulation is stopped, the thin inner diameter bypass pipe 15 is driven by circulating pump 152 to generate a high-speed water flow, enhancing the efficiency of waste heat replacement.

[0054] Optionally, in this embodiment, the inner diameters of the bypass pipe 15 and the water pipe 14 can also be the same size, wherein a switch valve is provided on the bypass pipe 15. In this case, the circulating water circuit is disconnected when water is in use and connected when water is not in use, which can also achieve the effects of the above embodiments.

[0055] like Figure 1 As shown, a temperature sensor 16 is provided between the water outlet valve 12 and the heating element 11 , and a water flow sensor 17 is provided at the water inlet 141 .

[0056] Specifically, temperature sensor 16 is installed in the pipeline between water outlet valve 12 and heating element 11, directly contacting the water flow to monitor the heated water temperature in real time. Water flow sensor 17, integrated into water inlet 141, detects the water flow entering the water heater and generates a flow rate signal. Signals from both temperature sensor 16 and water flow sensor 17 are transmitted to controller 13, which dynamically adjusts the start and stop of circulation pump 152 or the power output of heating element 11 based on the water temperature and flow rate data.

[0057] In one embodiment, a partition plate is provided inside the housing 1, which divides the installation space into independent water channel chambers and electrical chambers. The heating element 11, water pipe 14 and bypass pipe 15 are located in the water channel chamber, and the controller 13 and the driving circuit of the circulation pump 152 are located in the electrical chamber. A waterproof sealing ring is provided on the partition plate.

[0058] Specifically, the interior of the shell 1 is divided into two independent chambers by a partition plate: a water channel chamber (accommodating the heating element 11, the water pipe 14 and the bypass pipe 15) and an electrical chamber (accommodating the controller 13 and the driving circuit of the circulation pump 152); the partition plate is fixed to the inner wall of the shell 1 by means of slots or bolts, and a waterproof sealing ring is provided at the joint to achieve complete isolation between the chambers. The heating element 11, the water pipe 14 and the bypass pipe 15 in the water channel chamber are connected by flanges or threads, and all water channel interfaces are located in the chamber; the controller 13 in the electrical chamber is connected to the driving circuit of the circulation pump 152 by cables, and all electrical interfaces (such as power lines and signal lines) are led out from the side walls of the electrical chamber. By physically isolating the water and electrical components, the risk of short circuits caused by water leakage or condensed water intruding into the electrical chamber is completely eliminated. At the same time, the water channel and electrical components are installed in separate chambers independently, and the corresponding chambers can be disassembled separately during maintenance to avoid cross interference.

[0059] See Figures 5 to 11 , the present application also provides a control method for an instant electric water heater. Figure 5 and Figure 8 As shown, the method includes the following steps S110-S140.

[0060] S110, detecting the water inlet flow rate, and starting the heating element 11 when the water flow rate is greater than or equal to a preset flow rate threshold;

[0061] S120, when the water flow rate is less than the preset flow rate threshold, the heating element 11 is turned off, and the circulation pump 152 is started after a first preset time delay;

[0062] S130, driving the cold water in the water storage tank 151 and the hot water in the heating element 11 pipeline to circulate and replace each other through the circulation pump 152;

[0063] S140 , when the stopping condition of the circulation pump 152 is met, the circulation pump 152 is turned off.

[0064] Specifically, this embodiment monitors the water flow in real time through the water flow sensor 17 at the water inlet 141. When the flow reaches or exceeds a preset threshold, the controller 13 immediately starts the heating element 11 for instant heat output. When the flow falls below the preset threshold, the controller 13 simultaneously shuts down the heating element 11 and activates the countdown module to trigger the circulation pump 152 to operate after a first preset time delay. After the circulation pump 152 is started, it drives the cold water pre-stored in the water storage tank 151 to be injected from the inlet of the heating element 11 pipeline, while simultaneously pumping the high-temperature retained water in the pipeline back into the water storage tank 151, forming a forced replacement of the cold and hot water bodies. The cold and hot water are repeatedly exchanged in a closed loop through the continuous operation of the circulation pump 152 until the stop condition is met. The delayed start of the circulation pump 152 is intended to release as much heat as possible from the heating element 11 after heating stops into the retained water in the internal pipeline of the heating element 11, thereby improving the efficiency of pipeline waste heat replacement.

[0065] like Figure 6 and Figure 7 As shown, the stopping condition of the circulation pump 152 is: the circulation time of the circulation pump 152 is greater than or equal to the preset circulation time, and / or the water temperature inside the heating element 11 is less than or equal to the preset temperature threshold.

[0066] Specifically, controller 13 has a built-in timing module that accumulates the running time of circulating pump 152 in real time after it starts. When the timing reaches or exceeds the preset cycle time, circulating pump 152 is immediately shut down. A temperature probe is installed within heating element 11 to monitor the water temperature in the pipeline in real time. When the water temperature drops to or below the preset temperature threshold, it simultaneously triggers the shutdown instruction of circulating pump 152. The stop conditions can be effective separately or in combination, that is, circulating pump 152 stops when either the time condition or the temperature condition is met. Controller 13 prioritizes the temperature condition. If the water temperature reaches the standard before the specified time, the timing is immediately terminated. Otherwise, the time condition is used as a backup protection.

[0067] like Figure 9 As shown, in a more specific embodiment, the method further specifically includes the following steps S210-S230.

[0068] S210, monitoring the surface temperature of the heating element 11 in real time;

[0069] S220, when it is detected that the surface temperature exceeds the first temperature threshold, controlling the circulation pump 152 to operate at maximum power and turning off the heating element 11;

[0070] S230: If the surface temperature of the circulating pump 152 has not dropped below the second temperature threshold after the running time reaches the second preset time, an alarm signal is triggered and the main power supply is cut off.

[0071] Specifically, in this embodiment, a temperature probe is installed on the surface of the heating element 11 to collect temperature data in real time and transmit it to the controller 13; when the surface temperature exceeds the first temperature threshold, the controller 13 immediately performs the following actions: turns off the power supply of the heating element 11 to stop heat generation; switches the circulation pump 152 to the maximum power operation mode, forcing the acceleration of cold water to flow through the surface of the heating element 11 for heat dissipation. If the circulation pump 152 continues to operate at maximum power for a second preset time, and the surface temperature of the heating element 11 is still higher than the second temperature threshold (the second temperature threshold is lower than the first temperature threshold), the controller 13 triggers the sound and light alarm device or remote alarm notification, and simultaneously cuts off the main power input of the water heater to achieve hardware-level forced power-off protection. In the above manner, the present application can achieve active overheating protection, improve fault recovery capabilities, and extend system life.

[0072] like Figure 10 As shown, in a more specific embodiment, the method further specifically includes the following steps S310-S330.

[0073] S310, detecting the ambient temperature and the water temperature at the water inlet 141;

[0074] S320, dynamically adjusting the operating power of the circulation pump 152 according to the difference between the ambient temperature and the water temperature at the water inlet 141;

[0075] S330: When the temperature difference is less than the preset temperature difference, reduce the speed of the circulation pump 152 and extend the circulation time.

[0076] Specifically, the ambient temperature sensor 16 is installed on the outside of the water heater housing 1 to monitor the ambient temperature in real time. The water temperature sensor at the water inlet 141 is integrated into the water inlet 141 pipeline to detect the initial water temperature. The controller 13 calculates the real-time difference between the ambient temperature and the water temperature at the water inlet 141, matches the preset power regulation curve according to the temperature difference range, and dynamically adjusts the driving voltage or frequency of the circulation pump 152 to change its speed. When it is detected that the temperature difference is less than a preset threshold, the controller 13 reduces the speed of the circulation pump 152 (such as switching to a low gear or linearly reducing the speed) and proportionally extends the total operating time of the circulation pump 152. If the temperature difference exceeds the preset threshold, the speed of the circulation pump 152 is reversely increased and the cycle time is shortened to ensure a balance between heat dissipation efficiency and energy consumption.

[0077] See also Figure 11 , Figure 11 This is a schematic block diagram of a computer device provided in an embodiment of the present application. The computer device 400 can be a terminal or a server. The terminal can be a smart phone, tablet computer, laptop computer, desktop computer, personal digital assistant, wearable device, or other electronic device with communication capabilities. The server can be a standalone server or a server cluster consisting of multiple servers.

[0078] See also Figure 11 The computer device 400 includes a processor 402 , a memory, and a network interface 405 connected via a system bus 401 , wherein the memory may include a non-volatile storage medium 203 and an internal memory 404 .

[0079] The non-volatile storage medium 403 can store an operating system 4031 and a computer program 4032. The computer program 4032 includes program instructions, which, when executed, can enable the processor 402 to execute a multi-chip microcomputer stove low power consumption control method.

[0080] The processor 402 is used to provide computing and control capabilities to support the operation of the entire computer device 400.

[0081] The internal memory 404 provides an environment for the operation of the computer program 4032 in the non-volatile storage medium 403. When the computer program 4032 is executed by the processor 402, the processor 402 can execute a multi-chip microcomputer stove low power consumption control method.

[0082] The network interface 405 is used to communicate with other devices through the network. Figure 8 The structure shown in the figure is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device 400 to which the solution of the present application is applied. The specific computer device 400 may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0083] It should be understood that in the embodiment of the present application, the processor 402 may be a central processing unit (CPU), and the processor 402 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0084] Those skilled in the art will appreciate that all or part of the steps in the method of the above-described embodiment can be implemented by instructing the relevant hardware through a computer program. The computer program includes program instructions, which can be stored in a storage medium that is computer-readable. The program instructions are executed by at least one processor in the computer system to implement the steps in the method of the above-described embodiment.

[0085] Therefore, the present application also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed by a processor, the processor performs the following steps:

[0086] S110, detecting the water inlet flow rate, and starting the heating element when the water flow rate is greater than or equal to a preset flow rate threshold;

[0087] S120, when the water flow rate is less than a preset flow rate threshold, turning off the heating element and starting the circulation pump after a first preset delay;

[0088] S130, driving the cold water in the water storage tank and the hot water in the heating element pipeline to circulate and replace each other by a circulating pump;

[0089] S140: When the circulation pump stop condition is met, turn off the circulation pump.

[0090] The storage medium may be any computer-readable storage medium that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk.

[0091] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0092] The non-Company software tools or components appearing in the embodiments of this application are merely examples and do not represent actual use.

[0093] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of each unit is merely a logical functional division, and other division methods may be used in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not implemented.

[0094] The steps in the method of the embodiment of the present application can be adjusted in order, combined, and deleted according to actual needs. The units in the device of the embodiment of the present application can be combined, divided, and deleted according to actual needs. In addition, the functional units in the various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into a single unit.

[0095] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for enabling a computer device (which can be a personal computer, terminal, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application.

[0096] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. An instant electric water heater, characterized in that: include: Housing, heating element, water outlet valve, controller, water inlet and water outlet; The housing is provided with an installation space, the heating element is installed in the installation space, the water outlet valve is provided at the water outlet, the heating element is located between the water inlet and the water outlet and is connected by a water pipe, bypass pipes are connected in parallel at both ends of the heating element, a water storage tank and a circulation pump are connected to the bypass pipes in sequence, and the controller is electrically connected to the circulation pump; When the water outlet valve is closed, the controller controls the circulation pump to start so that the water storage tank, the circulation pump, the heating element and the water path flowing through the three form a circulating water path.

2. The instant electric water heater according to claim 1, characterized in that: The circulation pump is a bidirectional circulation pump, which drives the water flow from the water storage tank to the heating element during forward circulation, and drives the water flow from the heating element to the water storage tank during reverse circulation.

3. The instant electric water heater according to claim 1, characterized in that: The inner diameter of the bypass pipe is 2.5-6.5 mm, and the inner diameter of the water pipe is 10-20 mm.

4. The instant electric water heater according to claim 1, characterized in that: A temperature sensor is provided between the water outlet valve and the heating element, and a water flow sensor is provided at the water inlet.

5. The instant electric water heater according to claim 1, characterized in that: A partition plate is provided inside the shell, which divides the installation space into an independent water channel cavity and an electrical cavity. The heating element, water pipe and bypass pipe are located in the water channel cavity, and the controller and the driving circuit of the circulation pump are located in the electrical cavity. A waterproof sealing ring is provided on the partition plate.

6. The instant electric water heater according to claim 1, characterized in that: A display component is provided on the surface of the housing, and the display component is electrically connected to the controller.

7. A control method for an instant electric water heater, comprising the instant electric water heater according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: Detecting the water flow rate and activating the heating element when the water flow rate is greater than or equal to a preset flow threshold; When the water flow rate is less than a preset flow threshold, the heating element is turned off, and the circulation pump is started after a first preset time delay; The cold water in the water storage tank is driven by a circulating pump to circulate and replace the hot water in the heating element pipeline; The circulation pump is turned off when the circulation pump stop condition is met.

8. The control method of the instant electric water heater according to claim 7, characterized in that: The stopping condition of the circulation pump is: the circulation time of the circulation pump is greater than or equal to the preset circulation time, and / or the water temperature inside the heating element is less than or equal to the preset temperature threshold.

9. The control method of the instant electric water heater according to claim 7, characterized in that: The method further comprises the following steps: monitoring the surface temperature of the heating element in real time; When it is detected that the surface temperature exceeds a first temperature threshold, controlling the circulation pump to operate at maximum power and turning off the heating element; If the surface temperature has not dropped below the second temperature threshold after the circulation pump has been running for a second preset time, an alarm signal is triggered and the main power supply is cut off.

10. The control method of the instant electric water heater according to claim 7, characterized in that: The method further comprises the following steps: Detect ambient temperature and water inlet temperature; Dynamically adjust the operating power of the circulation pump according to the difference between the ambient temperature and the water inlet temperature; When the temperature difference is less than the preset temperature difference, reduce the circulation pump speed and extend the circulation time.

Images