Dry-burning-resistant water heater

Abstract

The invention relates to an anti-dry water heater. The dry-heating-resistant water heater comprises an inner container, a heating pipe, a water outlet pipe, a water inlet pipe, a first insulation connecting piece, a first non-contact type detection device, a second insulation connecting piece, a second non-contact type detection device and a controller. The first insulating connecting piece is detachably connected with the water inlet pipe and is provided with a first pipeline, the first pipeline is communicated with the water inlet pipe, the second insulating connecting piece is detachably connected with the water outlet pipe and is provided with a second pipeline, and the second pipeline is communicated with the water outlet pipe; the first non-contact detection device and the second non-contact detection device are respectively arranged on the outer walls of the corresponding insulating connecting pieces and are respectively used for acquiring a first water flow signal of water flow in the first pipeline and a second water flow signal of water flow in the second pipeline; the controller is used for controlling the heating pipe to work when heating is started and the first water flow signal and the second water flow signal are received at the same time. The dry-heating-resistant water heater is convenient to maintain and safer.

Description

Technical Field

[0001] The present application relates to the technical field of water heaters, and in particular to an anti-dry-burn water heater. Background Art

[0002] In modern home appliance technology, the anti-dry-burn function has become an indispensable protection function of electric water heaters. Currently, the mainstream anti-dry-burn technology on the market mainly relies on pressure sensors and water conduction technology.

[0003] Pressure sensors detect the water pressure inside the water heater to determine whether there is sufficient water for heating. This prevents heating from starting when there is no water or too little water, thereby avoiding equipment damage and safety hazards. However, the pressure sensor must be installed inside the water heater. Once a failure or abnormality occurs, maintenance becomes complicated and difficult, often requiring professional removal and replacement. Water conduction technology, on the other hand, determines the presence of water by conducting water between two sensing terminals, thereby controlling the start and stop of the heating tube. However, if the heating tube leaks or breaks down, it may directly damage the detection circuit, causing the anti-dry-burn function to fail, which in turn may cause a safety accident.

[0004] Therefore, the existing anti-dry-burn technology has obvious deficiencies in terms of maintenance convenience and safety. Therefore, developing a new anti-dry-burn technology that is both easy to maintain and highly safe has become an urgent problem to be solved in the current home appliance field. Summary of the Invention

[0005] The technical problem solved by the present invention is to provide a dry-boiling-proof water heater, which can effectively improve the safety of use and is convenient for maintenance.

[0006] A dry-boiling-proof water heater, comprising:

[0007] liner;

[0008] A heating tube, which is arranged in the cavity of the inner tank;

[0009] A water outlet pipe is provided in the inner tank;

[0010] A water inlet pipe is provided in the inner tank;

[0011] a first insulating connector, the first insulating connector being detachably connected to the water inlet pipe, the first insulating connector comprising a first pipe, and the first pipe being in communication with the water inlet pipe;

[0012] a first non-contact detection device, disposed on an outer wall of the first insulating connector, the first non-contact detection device being used to obtain a first water flow signal of the water flow in the first pipe;

[0013] a second insulating connector, the second insulating connector being detachably connected to the water outlet pipe, the second insulating connector having a second pipe, and the second pipe being in communication with the water outlet pipe;

[0014] a second non-contact detection device, disposed on an outer wall of the second insulating connector, the first non-contact detection device being used to obtain a second water flow signal of the water flow in the second pipe;

[0015] The controller is electrically connected to the heating tube, the first non-contact detection device, and the second non-contact detection device respectively. The controller is used to control the operation of the heating tube when starting heating and receiving the first water flow signal and the second water flow signal at the same time.

[0016] The anti-dry-burning water heater of the present invention has the following beneficial effects compared with the background technology:

[0017] By utilizing a non-contact detection device and controller to monitor and control the water heater's operating status in real time, the non-contact detection device, which doesn't come into direct contact with water, effectively prevents damage to the detection device from electrical leakage, improving the safety and reliability of the water heater. Furthermore, the non-contact detection device is mounted on the outer wall of the insulating connector, and the removable insulating connector facilitates maintenance.

[0018] In one embodiment, the anti-dry boiling water heater further includes a logic circuit, wherein the input end of the logic circuit is electrically connected to the first non-contact detection device and the second non-contact detection device respectively, and the output end of the logic circuit is electrically connected to the controller.

[0019] In this embodiment, the logic circuit acts as an intermediate processing layer, reducing controller pin count and costs while simplifying the controller's processing logic and improving the reliability and stability of the entire system. Furthermore, the logic circuit can be customized and optimized as needed to suit different application scenarios and requirements.

[0020] In one embodiment, the logic circuit includes an AND gate circuit, a first input end of the AND gate circuit is connected to the output end of the first non-contact detection device, a second input end of the AND gate circuit is connected to the output end of the second non-contact detection device, and an output end of the AND gate circuit is connected to an input end of the controller.

[0021] In this embodiment, the AND gate circuit serves as a simple logic judgment unit, which effectively implements the logical AND operation of the output signals of the two non-contact detection devices, thereby ensuring that the heating pipe will be activated only when there is water flowing in both pipes, thereby improving the safety and reliability of the water heater.

[0022] In one embodiment, the AND gate circuit uses a chip of model 74LS08.

[0023] In this embodiment, the AND gate chip is used to reduce the pin requirement of the controller, lower the cost, and reduce the software logic judgment of the controller to prevent misjudgment.

[0024] In one embodiment, the first insulating connector and the second insulating connector are both anti-electrical walls, the anti-electrical walls include an insulating shell, and the first non-contact detection device and the second non-contact detection device are both correspondingly attached to the insulating shell.

[0025] In this embodiment, an electric-proof wall is used as an insulating connector, and a non-contact detection device is attached thereto, which not only improves the safety performance of the water heater, but also enhances the accuracy and reliability of the detection system.

[0026] In one embodiment, the insulating shells of the first insulating connector and the second insulating connector are both formed with mounting grooves; wherein a snap is formed on the first inner wall of the mounting groove, a groove is formed on the second inner wall of the mounting groove, and an elastic member is provided in the groove to clamp the first non-contact detection device or the second non-contact detection device placed in the mounting groove; the first inner wall and the second inner wall are arranged opposite to each other.

[0027] In this embodiment, by providing a snap buckle on the first inner wall of the mounting groove and providing a groove and an elastic member on the second inner wall, during installation, the non-contact detection device can be easily pushed forward by utilizing the slope of the snap buckle, and the compression characteristics and elasticity of the elastic member are utilized to make the non-contact detection device gradually close to the mounting groove during the pushing process, thereby ensuring that the first non-contact detection device or the second non-contact detection device can be firmly clamped in the mounting groove, effectively preventing the device from loosening during use, improving the stability and reliability of the device, and thereby improving the detection accuracy and stability of the non-contact detection device.

[0028] In one embodiment, when the first non-contact detection device or the second non-contact detection device is placed in the installation groove, a sealing layer is provided at the notch of the installation groove.

[0029] In this embodiment, by forming the sealing layer, the non-contact detection device can be effectively sealed, and its internal circuit can be protected from environmental factors such as moisture and corrosion, thereby improving durability and service life.

[0030] In one embodiment, the first non-contact detection device and the second non-contact detection device are both non-contact liquid level sensors.

[0031] In this embodiment, the non-contact liquid level sensor's non-contact detection not only improves detection accuracy and reliability, but also avoids the risk of electric shock to the sensor caused by leakage from the heating element, which can occur with conventional water-conducting sensing terminals. Furthermore, since the non-contact liquid level sensor doesn't require direct contact with water, the risk of leakage due to poor sealing is reduced, further enhancing the safety and stability of the water heater.

[0032] In one embodiment, the logic circuit further comprises:

[0033] a first current limiting filter circuit, the first current limiting filter circuit being connected in series between the output terminal of the first non-contact detection device and the first input terminal of the AND gate circuit;

[0034] a second current limiting filter circuit, the second current limiting filter circuit being connected in series between the output terminal of the second non-contact detection device and the second input terminal of the AND gate circuit;

[0035] The third current limiting filter circuit is connected in series between the output end of the AND gate circuit and the input end of the controller.

[0036] In this embodiment, during the operation of the water heater, if the signal line is too long, it is easy to generate current and signal interference. Such interference may not only affect the accurate judgment of the signal by the gate circuit, but also damage the I / O port of the controller. The introduction of the current limiting filter circuit effectively solves the problem of sudden current and signal voltage glitch ripple caused by the excessive length of the feedback signal line, and can effectively suppress the interference signal and ensure the stability and accuracy of signal transmission. Secondly, the third current limiting filter circuit is set between the output end of the gate circuit and the input end of the controller, which plays the role of re-filtering and current limiting the final output signal, which not only protects the I / O port of the controller from potential current shocks, but also ensures that the signal received by the controller is clear and stable, thereby improving the stability and reliability of the entire control system.

[0037] In one embodiment, the first current limiting filter circuit includes:

[0038] a first current limiting resistor, wherein a first end of the first current limiting resistor is connected to the output end of the first non-contact detection device, and a second end of the first current limiting resistor is connected to the first input end of the AND gate circuit;

[0039] a first ceramic capacitor, wherein a first end of the first ceramic capacitor is connected to the first input end of the AND gate circuit, and a second end of the first ceramic capacitor is grounded;

[0040] A first pull-down resistor is provided, wherein a first end of the first pull-down resistor is connected to a first end of the first ceramic capacitor, and a second end of the first pull-down resistor is grounded.

[0041] In this embodiment, a first current-limiting resistor is added between the AND gate circuit and the output end of the first contactless detection device to prevent the pin of the AND gate circuit from overcurrent breakdown, a first ceramic capacitor is added to prevent the signal from generating a sudden instantaneous high voltage to break down the AND gate circuit, and a first pull-down resistor is added to prevent the wiring from being disturbed and causing a sudden high level, so that the AND gate circuit generates a false judgment signal.

[0042] In one embodiment, the second current limiting filter circuit includes:

[0043] a second current limiting resistor, wherein a first end of the second current limiting resistor is connected to the output end of the second non-contact detection device, and a second end of the second current limiting resistor is connected to the second input end of the AND gate circuit;

[0044] a second ceramic capacitor, wherein a first end of the second ceramic capacitor is connected to the second input end of the AND gate circuit, and a second end of the second ceramic capacitor is grounded;

[0045] A second pull-down resistor, wherein a first end of the second pull-down resistor is connected to the first end of the second ceramic capacitor, and a second end of the second pull-down resistor is grounded.

[0046] In this embodiment, a second current-limiting resistor is added between the output ends of the AND gate circuit and the second contactless detection device to prevent the pins of the AND gate circuit from overcurrent breakdown, a second ceramic capacitor is added to prevent the signal from generating a sudden instantaneous high voltage to break down the AND gate circuit, and a second pull-down resistor is added to prevent the wiring from being disturbed and causing a sudden high level, so that the AND gate circuit generates a false judgment signal.

[0047] In one embodiment, the third current limiting filter circuit includes:

[0048] a third current limiting resistor, wherein a first end of the third current limiting resistor is connected to the output end of the AND gate circuit, and a second end of the third current limiting resistor is connected to the input end of the controller;

[0049] a third ceramic capacitor, wherein a first end of the third ceramic capacitor is connected to the input end of the controller, and a second end of the third ceramic capacitor is grounded;

[0050] A third pull-down resistor, wherein a first end of the third pull-down resistor is connected to the second end of the third current-limiting resistor, and a second end of the third pull-down resistor is grounded.

[0051] In this embodiment, a third current-limiting resistor is added between the AND gate circuit and the output end of the controller to prevent the I / O pin of the controller from overcurrent breakdown, a third ceramic capacitor is added to prevent the signal from generating a sudden instantaneous high voltage to break down the I / O pin of the controller, and a third pull-down resistor is added to prevent the wiring from being disturbed and causing a sudden high level, so that the I / O pin of the controller generates a false judgment signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 A schematic diagram of the structure of an anti-dry-burn water heater in practice;

[0054] Figure 2 A schematic structural diagram of an anti-dry-boiling water heater in another embodiment;

[0055] Figure 3 A schematic structural diagram of an anti-dry-boiling water heater in another embodiment;

[0056] Figure 4a A schematic diagram of the structure of an electric shock wall in practice;

[0057] Figure 4b for Figure 4a Cross-section of the electric fence in the figure;

[0058] Figure 4c for Figure 4b A partial enlarged schematic diagram of the middle area A;

[0059] Figure 5 1 is a circuit diagram of a non-contact liquid level sensor in one embodiment;

[0060] Figure 6 Schematic diagram of the structure of an anti-dry-boiling water heater in another embodiment.

[0061] Explanation of the accompanying drawings: 2-inner tank, 4-heating tube, 6-water outlet pipe, 8-water inlet pipe, 10-first insulating connector, 12-first non-contact detection device, 14-second insulating connector, 16-second non-contact detection device, 18-controller, 20-logic circuit, 202-AND gate circuit, 204-first current limiting filter circuit, 206-second current limiting filter circuit, 208-third current limiting filter circuit, 22-magnesium rod, 30-installation slot, 302-clip, 304-groove, 306-elastic part, 50-sealing layer. DETAILED DESCRIPTION

[0062] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0064] It will be understood that the terms "first," "second," etc. used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element.

[0065] Spatially relative terms such as "under," "beneath," "beneath," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, the element or feature described as "under" or "beneath" or "beneath" the other elements will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" can include both upper and lower orientations. In addition, the device can also include alternative orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0066] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intervening element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc., if there is transmission of electrical signals or data between the connected objects.

[0067] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0068] Based on the reasons described in the background technology, in an exemplary embodiment, as Figure 1As shown, the present application provides an anti-dry-burning water heater, including an inner tank 2, a heating tube 4, a water outlet pipe 6, a water inlet pipe 8, a first insulating connector 10, a first non-contact detection device 12, a second insulating connector 14, a second non-contact detection device 16 and a controller 18. The heating tube 4 is arranged in the cavity of the inner tank 2, the water outlet pipe 6 is arranged in the inner tank 2, the water inlet pipe 8 is arranged in the inner tank 2, the first insulating connector 10 is detachably connected to the water inlet pipe 8, the first insulating connector 10 has a first pipe, and the first pipe is connected to the water inlet pipe 8, the first non-contact detection device 12 is arranged on the outer wall of the first insulating connector 10, and is used to obtain a first water flow signal of the water flow in the first pipe, the second insulating connector 14 is detachably connected to the water outlet pipe 6, the second insulating connector 14 has a second pipe, and the second pipe is connected to the water outlet pipe 6 The first non-contact detection device 12 is arranged on the outer wall of the second insulating connector 14, and is used to obtain the second water flow signal of the water flow in the second pipe; the controller 18 is electrically connected to the heating tube 4, the first non-contact detection device 12, and the second non-contact detection device 16 respectively. When the controller 18 starts heating, when the first water flow signal and the second water flow signal are received at the same time, the heating tube 4 is controlled to work. The receipt of the first water flow signal and the second water flow signal at the same time indicates that the water heater is in a full water state, thereby effectively avoiding dry burning.

[0069] The first non-contact detection device 12 and the second non-contact detection device 16 may refer to devices such as non-contact capacitive liquid level sensors, non-contact ultrasonic liquid level sensors and separate photoelectric liquid level sensors, which monitor water level changes without direct contact with water.

[0070] For example, during installation, the first insulating connector 10 is detachably connected to the water inlet pipe 8, and the second insulating connector 14 is detachably connected to the water outlet pipe 6, making the water heater more convenient to install, repair and replace parts. The first non-contact detection device 12 is provided on the outer wall of the detachable first insulating connector 10, and is used to obtain a first water flow signal of the water flow in the first pipe. Similarly, the second non-contact detection device 16 is provided on the outer wall of the detachable second insulating connector 14, and is used to obtain a second water flow signal of the water flow in the second pipe, and generates a corresponding water flow signal by detecting the change of water flow in the pipe without direct contact with water. The controller 18 is electrically connected to the heating pipe 4, the first non-contact detection device 12 and the second non-contact detection device 16 respectively. When the controller 18 receives a heating instruction from the user, it monitors whether the first water flow signal and the second water flow signal are received at the same time. If the controller 18 receives these two signals at the same time, it means that water flows through both the water inlet pipe 8 and the water outlet pipe 6, and further as follows Figure 1As can be seen from the structure of the water outlet pipe 6 and water inlet pipe 8 in the illustrated water heater, in order for water to flow through both the water inlet pipe 8 and the water outlet pipe 6, the water heater's inner tank 2 must be full of water. At this point, the controller 18 controls the heating tube 4 to begin heating the water. If the controller 18 does not receive both signals simultaneously, for example, only receiving the first water flow signal but not the second water flow signal, or receiving neither signal at all, this indicates that the water level in the water heater's inner tank 2 is insufficient, possibly due to a blockage in the water outlet pipe 6 or the water inlet pipe 8. In this case, the controller 18 will stop the heating tube 4 to prevent dry-burning and damage to the water heater or a safety hazard. It should be noted that the controller 18 can control the heating tube 4 using simple electronic components such as a single-chip microcomputer. For example, the first and second water flow signals can both be high-level signals, while the absence of a water flow signal can be low-level signals. The single-chip microcomputer will only control the heating tube 4 when it receives both high-level signals. In addition, the controller 18 can also determine the magnitude or speed of the water flow based on information such as the strength or frequency of the received water flow signal, thereby achieving more precise control over the operating status of the water heater. For example, when the water flow signal is weak, the controller 18 can reduce the power of the heating tube 4 to prevent overheating or damage to the water heater; when the water flow signal is strong, the controller 18 can increase the power of the heating tube 4 to meet the user's demand for hot water.

[0071] The aforementioned anti-dry-boil water heater utilizes a non-contact detection device and controller 18 to monitor and control the water heater's operating status in real time, effectively preventing electrical leakage from damaging the detection device and improving the safety and reliability of the water heater. Furthermore, the non-contact detection device is mounted on the outer wall of the insulating connector, and the removable insulating connector facilitates maintenance.

[0072] In an exemplary embodiment, the controller 18 receives the first water flow signal and the second water flow signal simultaneously for a duration exceeding a preset time, and the controller 18 controls the heating tube 4 to operate, thereby reducing the possibility of false start-up.

[0073] In an exemplary embodiment, Figure 2 As shown, the anti-dry boiling water heater further includes a logic circuit 20 . The input end of the logic circuit 20 is electrically connected to the first non-contact detection device 12 and the second non-contact detection device 16 , respectively, and the output end of the logic circuit 20 is electrically connected to the controller 18 .

[0074] The logic circuit 20 may be a combination of one or more AND gate circuits, OR gate circuits, and NOT gate circuits.

[0075] For example, when the water heater begins operation, the first non-contact detection device 12 and the second non-contact detection device 16 begin monitoring the water flow in the water inlet pipe 8 and the water outlet pipe 6, and output corresponding water flow signals to the input of the logic circuit 20. After receiving these two signals, the logic circuit 20 performs a logical judgment. The specific judgment logic can be set according to the design requirements of the water heater. For example, if the first and second water flow signals are high-level signals, the logic circuit 20 can be designed to output a high-level signal to the input of the controller 18 when it receives high-level signals from both detection devices (indicating that water is flowing in both the water inlet pipe 8 and the water outlet pipe 6); otherwise, it outputs a low-level signal or no signal. The controller 18 then controls the operation of the heating tube 4 based on the signals output by the logic circuit 20. If the controller 18 receives a high-level signal from the logic circuit 20, it indicates that the logic circuit 20 determines that there is sufficient water in the water tank 2 of the water heater, and the controller 18 activates the heating tube 4 to heat it. If the controller 18 does not receive a high-level signal, or receives a low-level signal or no signal, the controller 18 will determine that the water level in the inner tank 2 of the water heater is insufficient. At this time, controlling the heating tube 4 to operate may cause dry burning and damage the water heater.

[0076] It should be noted that, in addition to being designed with the judgment logic described above, the logic circuit 20 can also be designed to start timing after receiving the first water flow signal, and only output a high-level signal to the controller 18 if it also receives the second water flow signal within a certain period of time. This can prevent misjudgments caused by transient water flow or interference signals.

[0077] In this embodiment, logic circuit 20 acts as an intermediate processing layer, reducing the number of pins on controller 18 and lowering costs. It also simplifies the processing logic of controller 18 and improves the reliability and stability of the entire system. Furthermore, logic circuit 20 can be customized and optimized as needed to suit different application scenarios and requirements.

[0078] In an exemplary embodiment, Figure 3 As shown, the logic circuit 20 includes an AND gate circuit 202. A first input terminal of the AND gate circuit 202 is connected to an output terminal of the first non-contact detection device 12, a second input terminal of the AND gate circuit 202 is connected to an output terminal of the second non-contact detection device 16, and an output terminal of the AND gate circuit 202 is connected to an input terminal of the controller 18.

[0079] The AND gate circuit 202 may refer to an AND gate chip.

[0080] For example, when the water heater begins operation, the two non-contact detection devices begin monitoring the water flow in their respective pipes and output corresponding level signals to the inputs of AND gate circuit 202. Only when all inputs of AND gate circuit 202 receive high-level signals will its output output a high-level signal. Therefore, only when both the first non-contact detection device 12 and the second non-contact detection device 16 detect water flow and output the first and second water flow signals (high-level signals) will the output of AND gate circuit 202 output a high-level signal, which is then transmitted to the input of controller 18. Upon receiving these high-level signals, controller 18 determines that water is flowing through both the water inlet pipe 8 and the water outlet pipe 6, indicating that there is sufficient water in the water heater's inner tank 2. Controller 18 then activates heating tube 4 according to pre-set logic. If any non-contact detection device, or both, detects no water flow, the output of AND gate circuit 202 will not output a high-level signal. After receiving such a signal, the controller 18 will determine that the water level in the inner tank 2 of the water heater is insufficient, and thus control the heating tube 4 to stop working to prevent the water heater from drying out.

[0081] In this embodiment, the AND gate circuit 202 serves as a simple logic judgment unit, which effectively implements the logical AND operation of the output signals of the two non-contact detection devices, thereby ensuring that the heating tube 4 will be started only when there is water flow in both pipes, thereby improving the safety and reliability of the water heater.

[0082] In an exemplary embodiment, Figure 3 As shown, AND gate circuit 202 uses a chip model 74LS08. The AND gate chip (74LS08) has a water inlet feedback terminal 1A and a water outlet feedback terminal 1B. Through the AND gate chip output terminal 1Y, the AND gate chip transmits the signal to the controller 18 (SH79F0819CV1.0\SH79F083ACV2.0). The controller 18 determines whether there is water in the inner tank 2 of the water heater based on the signal to prevent dry boiling. Among them, AND gate circuit 202 can also use AND gate chips model SN7408 or model CD4081. The specific judgment logic can be referred to in Table 1 below:

[0083] Table 1

[0084]

[0085] When the non-contact detection device detects water, the output is 1, that is, the water inlet feedback terminal 1A or the water outlet feedback terminal 1B receives 1; when the non-contact detection device does not detect water, the output is 0, that is, the water inlet feedback terminal 1A or the water outlet feedback terminal 1B receives 0; it can be seen that when the output of the AND gate output terminal is 1, the controller 18 determines that the inner tank 2 of the water heater is in a full water state.

[0086] In this embodiment, the AND gate chip is used to reduce the pin requirement of the controller 18, thereby lowering the cost, and reducing the software logic judgment of the controller 18, thereby reducing the occurrence of program misjudgment.

[0087] In an exemplary embodiment, Figure 4a As shown, the first insulating connector 10 and the second insulating connector 14 are both anti-electricity walls, which include an insulating shell, and the first non-contact detection device 12 and the second non-contact detection device 16 are both correspondingly attached to the insulating shell.

[0088] For example, Figure 4a As shown, the non-contact detection device is installed in an insulating housing and has no contact with water. The anti-electric wall serves as an insulating connector, and its core structure is an insulating housing. This housing effectively isolates the electrical components from the external environment, reducing the risk of leakage and electric shock. At the same time, the first non-contact detection device 12 and the second non-contact detection device 16 are both correspondingly attached to the insulating housing. This installation method not only ensures the stable operation of the detection device, but also makes the entire system more compact and beautiful. By directly attaching the non-contact detection device to the insulating housing of the anti-electric wall, the water heater can more accurately monitor the water flow in the water inlet pipe 8 and the water outlet pipe 6, reducing interference and loss during signal transmission, and improving detection accuracy and response speed.

[0089] In this embodiment, an electric-proof wall is used as an insulating connector, and a non-contact detection device is attached thereto, which not only improves the safety performance of the water heater, but also enhances the accuracy and reliability of the detection system.

[0090] In an exemplary embodiment, Figure 4b and Figure 4c As shown, the insulating shells of the first insulating connector 10 and the second insulating connector 14 are both formed with a mounting groove 30; wherein, a buckle 302 is formed on the first inner wall of the mounting groove 30, and a groove 304 is formed on the second inner wall of the mounting groove 30, and an elastic member 306 is provided in the groove 304 to clamp the first non-contact detection device 12 or the second non-contact detection device 16 placed in the mounting groove 30; the first inner wall and the second inner wall are arranged opposite to each other.

[0091] For example, Figure 4c As shown, Figure 4c for Figure 4bA partial enlarged schematic diagram of the mounting groove 30 in area A shows that a buckle 302 is provided on the first inner wall of the mounting groove 30, and a groove 304 and an elastic member 306 are provided on the second inner wall. During installation, the slope of the buckle 302 is utilized to facilitate the advancement of the non-contact detection device, and the compression characteristics and elasticity of the elastic member 306 are utilized to make the non-contact detection device gradually close to the mounting groove 30 during the advancement process, thereby ensuring that the first non-contact detection device 12 or the second non-contact detection device 16 can be firmly clamped in the mounting groove 30, effectively preventing the device from loosening during use, improving the stability and reliability of the device, and thereby improving the detection accuracy and stability of the non-contact detection device.

[0092] In an exemplary embodiment, Figure 4b and Figure 4c As shown, when the first non-contact detection device 12 or the second non-contact detection device 16 is placed in the installation groove 30 , a sealing layer 50 is provided at the notch of the installation groove 30 .

[0093] Exemplarily, the sealing layer 50 may refer to a sealing layer formed by epoxy resin. Using waterproof materials such as epoxy resin to form the sealing layer 50 can effectively seal the non-contact detection device, protect its internal circuit from environmental factors such as moisture and corrosion, and improve durability and service life.

[0094] In an exemplary embodiment, the first non-contact detection device 12 and the second non-contact detection device 16 are both non-contact liquid level sensors.

[0095] For example, the model of the non-contact liquid level sensor may be XKC-Y26, and the circuit diagram of the non-contact liquid level sensor is as follows: Figure 5As shown, K1 is a metal plate attached to the outer wall of the insulating housing. It detects the capacitance of the insulating housing. When the water level exceeds the specified value or water flows through, the capacitance of the insulating housing changes. The difference between the capacitance at pins CIN2 and CIN1 is detected. If the capacitance at pin CIN2 is greater than the capacitance at pin CIN1 + 0.2 pF, water is detected; otherwise, no water is detected. During calibration, the difference between the capacitances at pins CIN1 and CIN2 can be adjusted to locate the specific water level detection point. By adjusting the capacitance of pin CIN1 (C1 is an adjustable capacitor used to adjust the precise water level, typically between 0 and 10 pF), the capacitances at pins CIN1 and CIN2 are aligned. Compared to solutions using water-conducting sensing terminals, the use of a non-contact liquid level sensor prevents damage to the sensor from electrical shock from the heating element and eliminates the risk of water leakage due to poor sealing. The non-contact liquid level sensor determines whether there is water by comparing the capacitance values ​​when there is water and when there is no water. When the non-contact liquid level sensor detects water, the voltage at the feedback terminal OUT changes from 0V to the VDD voltage value, that is, the output is high at this time.

[0096] In this embodiment, the non-contact liquid level sensor's non-contact detection not only improves detection accuracy and reliability, but also avoids the risk of electric shock to the sensor caused by leakage from the heating element, which can occur with conventional water-conducting sensing terminals. Furthermore, since the non-contact liquid level sensor doesn't require direct contact with water, the risk of leakage due to poor sealing is reduced, further enhancing the safety and stability of the water heater.

[0097] In an exemplary embodiment, Figure 6 As shown, the logic circuit 20 further includes a first current limiting filter circuit 204, a second current limiting filter circuit 206, and a third current limiting filter circuit 208. The first current limiting filter circuit 204 is connected in series between the output terminal of the first non-contact detection device 12 and the first input terminal of the AND gate circuit 202; the second current limiting filter circuit 206 is connected in series between the output terminal of the second non-contact detection device 16 and the second input terminal of the AND gate circuit 202; and the third current limiting filter circuit 208 is connected in series between the output terminal of the AND gate circuit 202 and the input terminal of the controller 18.

[0098] For example, in order to avoid the sudden current and signal voltage ripples caused by the excessive length of the feedback signal line between the AND gate circuit 202 and the non-contact detection device, which affects the judgment of the AND gate circuit 202 and damages the controller 18I / O port, the above problems are solved by setting a first current limiting filter circuit 204, a second current limiting filter circuit 206 and a third current limiting filter circuit 208.

[0099] In this embodiment, during the operation of the water heater, if the signal line is too long, it is easy to generate current and signal interference. These interferences may not only affect the accurate judgment of the signal by the gate circuit 202, but may also cause damage to the I / O port of the controller 18. The introduction of the current limiting filter circuit effectively solves the problem of sudden current and signal voltage glitch ripple caused by the excessive length of the feedback signal line, and can effectively suppress the interference signal and ensure the stability and accuracy of signal transmission. Secondly, the third current limiting filter circuit 208 is set between the output end of the gate circuit and the input end of the controller 18, which plays the role of re-filtering and current limiting the final output signal, which not only protects the I / O port of the controller 18 from potential current shocks, but also ensures that the signal received by the controller 18 is clear and stable, thereby improving the stability and reliability of the entire control system.

[0100] In an exemplary embodiment, Figure 6 As shown. The first current limiting filter circuit 204 includes a first current limiting resistor R1, a first ceramic capacitor C5, and a first pull-down resistor R2. The first end of the first current limiting resistor R1 is connected to the output end of the first non-contact detection device 12, and the second end of the first current limiting resistor R1 is connected to the first input end of the AND gate circuit 202; the first end of the first ceramic capacitor C5 is connected to the first input end of the AND gate circuit 202, and the second end of the first ceramic capacitor C5 is grounded; the first end of the first pull-down resistor R2 is connected to the first end of the first ceramic capacitor C5, and the second end of the first pull-down resistor R2 is grounded.

[0101] For example, Figure 6 The circuit structure shown is used as an example for explanation. A first current-limiting resistor R1 is added between the AND gate circuit 202 and the output end of the first contactless detection device 12 to prevent the pin of the AND gate circuit 202 from overcurrent breakdown. A first ceramic capacitor C5 is added to prevent the signal from generating a sudden instantaneous high voltage to break down the AND gate circuit 202. A first pull-down resistor R2 is added to prevent the wiring from being disturbed and causing a sudden high level, so that the AND gate circuit 202 generates a false judgment signal.

[0102] In an exemplary embodiment, the second current limiting filter circuit 206 includes a second current limiting resistor R3, a second ceramic capacitor C6, and a second pull-down resistor R4. A first end of the second current limiting resistor R3 is connected to the output end of the second non-contact detection device 16, and a second end of the second current limiting resistor R3 is connected to the second input end of the AND gate circuit 202; a second ceramic capacitor C6, a first end of which is connected to the second input end of the AND gate circuit 202, and a second end of which is grounded; and a second pull-down resistor R4, a first end of which is connected to the first end of the second ceramic capacitor C6, and a second end of which is grounded.

[0103] For example, Figure 6 The circuit structure shown is used as an example for explanation. A second current-limiting resistor R3 is added between the output end of the AND gate circuit 202 and the second non-contact detection device 16 to prevent the pin of the AND gate circuit 202 from overcurrent breakdown. A second ceramic capacitor C6 is added to prevent the signal from generating a sudden instantaneous high voltage to break down the AND gate circuit 202. A second pull-down resistor R4 is added to prevent the wiring from being disturbed and causing a sudden high level, so that the AND gate circuit 202 generates a false judgment signal.

[0104] In an exemplary embodiment, the third current limiting filter circuit 208 includes a third current limiting resistor R5, a third ceramic capacitor C7, and a third pull-down resistor R6. A first end of the third current limiting resistor R5 is connected to the output of the AND gate circuit 202, and a second end of the third current limiting resistor R5 is connected to the input of the controller 18; a first end of the third ceramic capacitor C7 is connected to the input of the controller 18, and a second end of the third ceramic capacitor C7 is grounded; a first end of the third pull-down resistor R6 is connected to the second end of the third current limiting resistor R5, and a second end of the third pull-down resistor R6 is grounded.

[0105] For example, Figure 6 The circuit structure shown is used as an example for explanation. A third current-limiting resistor R5 is added between the AND gate circuit 202 and the output end of the controller 18 to prevent the I / O pin of the controller 18 from overcurrent breakdown. A third ceramic capacitor C7 is added to prevent the signal from generating a sudden instantaneous high voltage to break down the I / O pin of the controller 18. A third pull-down resistor R6 is added to prevent the wiring from being disturbed and causing a sudden high level, so that the I / O pin of the controller 18 generates a false judgment signal.

[0106] In an exemplary embodiment, Figure 1 As shown, the anti-dry-burning water heater further includes a magnesium rod 22. By arranging the magnesium rod 22 in the inner tank of the electric water heater, corrosion of the inner tank is prevented.

[0107] Throughout this specification, references to terms such as "some embodiments," "other embodiments," and "desired embodiments" indicate that a particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. Although these terms are used interchangeably throughout this specification, they do not necessarily refer to the same embodiment or example.

[0108] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A dry-burning prevention water heater, characterized in that: The anti-dry-burning water heater comprises: Liner (2); A heating tube (4), the heating tube (4) being arranged in the cavity of the inner container (2); A water outlet pipe (6), the water outlet pipe (6) being arranged on the inner container (2); A water inlet pipe (8), the water inlet pipe (8) being arranged in the inner container (2); a first insulating connector (10), the first insulating connector (10) being detachably connected to the water inlet pipe (8), the first insulating connector (10) having a first pipe, and the first pipe being in communication with the water inlet pipe (8); a first non-contact detection device (12), arranged on an outer wall of the first insulating connector (10), the first non-contact detection device (12) being used to obtain a first water flow signal of the water flow in the first pipe; a second insulating connector (14), the second insulating connector (14) being detachably connected to the water outlet pipe (6), the second insulating connector (14) having a second pipe, and the second pipe being in communication with the water outlet pipe (6); a second non-contact detection device (16) disposed on an outer wall of the second insulating connector (14), wherein the first non-contact detection device (12) is used to obtain a second water flow signal of the water flow in the second pipe; A controller (18), wherein the controller (18) is electrically connected to the heating tube (4), the first non-contact detection device (12), and the second non-contact detection device (16), respectively. The controller (18) is used to control the heating tube (4) to operate when the first water flow signal and the second water flow signal are received simultaneously when starting heating.

2. The anti-dry-burning water heater according to claim 1, characterized in that: The anti-dry-boiling water heater further comprises a logic circuit (20), wherein an input end of the logic circuit (20) is electrically connected to the first non-contact detection device (12) and the second non-contact detection device (16), respectively, and an output end of the logic circuit (20) is electrically connected to the controller (18).

3. The anti-dry-burning water heater according to claim 2, characterized in that: The logic circuit (20) includes an AND gate circuit (202), wherein a first input end of the AND gate circuit (202) is connected to an output end of the first non-contact detection device (12), a second input end of the AND gate circuit (202) is connected to an output end of the second non-contact detection device (16), and an output end of the AND gate circuit (202) is connected to an input end of the controller (18).

4. The anti-dry-burning water heater according to claim 3, characterized in that: The AND gate circuit (202) uses a chip of model 74LS08.

5. The anti-dry-burning water heater according to claim 2, characterized in that: The first insulating connector (10) and the second insulating connector (14) are both anti-electricity walls, and the anti-electricity walls include an insulating shell, and the first non-contact detection device (12) and the second non-contact detection device (16) are both correspondingly attached to the insulating shell.

6. The anti-dry-boiling water heater according to claim 5, characterized in that: The insulating housings of the first insulating connector (10) and the second insulating connector (14) are both formed with a mounting groove (30); wherein a buckle (302) is formed on a first inner wall of the mounting groove (30), a groove (304) is formed on a second inner wall of the mounting groove (30), and an elastic member (306) is provided in the groove (304) to clamp the first non-contact detection device (12) or the second non-contact detection device (16) placed in the mounting groove (30); the first inner wall and the second inner wall are arranged opposite to each other.

7. The anti-dry-boiling water heater according to claim 6, characterized in that: When the first non-contact detection device (12) or the second non-contact detection device (16) is placed in the installation groove (30), a sealing layer (50) is provided at the notch of the installation groove (30).

8. The anti-dry-boiling water heater according to any one of claims 2 to 6, characterized in that: The first non-contact detection device (12) and the second non-contact detection device (16) are both non-contact liquid level sensors.

9. The anti-dry-boiling water heater according to claim 3, characterized in that: The logic circuit (20) further includes: a first current limiting filter circuit (204), the first current limiting filter circuit (204) being connected in series between the output end of the first non-contact detection device (12) and the first input end of the AND gate circuit (202); a second current limiting filter circuit (206), the second current limiting filter circuit (206) being connected in series between the output end of the second non-contact detection device (16) and the second input end of the AND gate circuit (202); A third current limiting filter circuit (208) is connected in series between the output end of the AND gate circuit (202) and the input end of the controller (18).

10. The anti-dry-boiling water heater according to claim 9, characterized in that: The first current limiting filter circuit (204) comprises: a first current limiting resistor R1, wherein a first end of the first current limiting resistor R1 is connected to an output end of the first non-contact detection device (12), and a second end of the first current limiting resistor R1 is connected to a first input end of the AND gate circuit (202); a first ceramic capacitor C5, wherein a first end of the first ceramic capacitor C5 is connected to a first input end of the AND gate circuit (202), and a second end of the first ceramic capacitor C5 is grounded; a first pull-down resistor R2, wherein a first end of the first pull-down resistor R2 is connected to a first end of the first ceramic capacitor C5, and a second end of the first pull-down resistor R2 is grounded; Alternatively, the second current limiting filter circuit (206) includes: a second current limiting resistor R3, wherein a first end of the second current limiting resistor R3 is connected to an output end of the second non-contact detection device (16), and a second end of the second current limiting resistor R3 is connected to a second input end of the AND gate circuit (202); a second ceramic capacitor C6, wherein a first end of the second ceramic capacitor C6 is connected to a second input end of the AND gate circuit (202), and a second end of the second ceramic capacitor C6 is grounded; a second pull-down resistor R4, wherein a first end of the second pull-down resistor R4 is connected to a first end of the second ceramic capacitor C6, and a second end of the second pull-down resistor R4 is grounded; Alternatively, the third current limiting filter circuit (208) includes: a third current limiting resistor R5, wherein a first end of the third current limiting resistor R5 is connected to the output end of the AND gate circuit (202), and a second end of the third current limiting resistor R5 is connected to the input end of the controller (18); a third ceramic capacitor C7, wherein a first end of the third ceramic capacitor C7 is connected to an input end of the controller (18), and a second end of the third ceramic capacitor C7 is grounded; a third pull-down resistor R6 , wherein a first end of the third pull-down resistor R6 is connected to the second end of the third current-limiting resistor R5 , and a second end of the third pull-down resistor R6 is grounded.

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