Dry-burning-resistant water heater

Abstract

The utility model 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 electrically connected with the heating pipe, the first non-contact detection device and the second non-contact detection device. 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-boiling 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. At present, the mainstream anti-dry-burn technology on the market mainly relies on pressure sensors and water conduction technology.

[0003] The pressure sensor detects the water pressure inside the water heater to determine whether there is enough water for heating, preventing the 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, and often requires professionals to disassemble and replace it. The water conduction technology uses water to conduct two sensor terminals to determine whether there is water, thereby controlling the start and stop of the heating tube. However, when the heating tube leaks or breaks down, it may directly damage the detection circuit, causing the anti-dry burning function to fail, and then causing a safety accident.

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

[0005] The technical problem solved by the utility model is to provide an anti-dry-burning 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, which is arranged on the inner tank;

[0010] A water inlet pipe, which is arranged in the inner tank;

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

[0012] A first non-contact detection device is arranged on the outer wall of the first insulating connector, and is 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 is detachably connected to the water outlet pipe, the second insulating connector has a second pipeline, and the second pipeline is in communication with the water outlet pipe;

[0014] A second non-contact detection device is arranged on the outer wall of the second insulating connector, and the first non-contact detection device is 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.

[0016] Compared with the background technology, the anti-dry-burning water heater of the utility model has the following beneficial effects:

[0017] By using a non-contact detection device and a controller to achieve real-time monitoring and control of the working state of the water heater, the non-contact detection device does not directly contact water, which can effectively avoid the situation where the water heater is damaged by leakage, thereby improving the safety and reliability of the water heater. In addition, the non-contact detection device is installed on the outer wall of the insulating connector, and the detachable setting of the insulating connector makes maintenance more convenient.

[0018] In one embodiment, the anti-dry boiling water heater further includes a logic circuit, 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 plays the role of an intermediate processing layer, reducing the number of controller pins, reducing costs, simplifying the processing logic of the controller, and improving the reliability and stability of the entire system. In addition, the logic circuit can also be customized and optimized as needed to adapt to 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 an output end of the first non-contact detection device, a second input end of the AND gate circuit is connected to an 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 logic AND operation of the output signals of the two non-contact detection devices, thereby ensuring that the heating tube will only be started when there is water flow in the two 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, reduce 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 anti-electric 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 buckle 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 arranged 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, a buckle is provided on the first inner wall of the installation groove, and a groove and an elastic member are provided on the second inner wall. During installation, the non-contact detection device is easily pushed forward by utilizing the slope of the buckle, and the compression characteristics and elasticity of the elastic member are utilized to make the non-contact detection device gradually close to the installation 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 installation groove, effectively preventing the device from loosening during use, improving the stability and reliability of the device, and further improving the detection accuracy and stability of the non-contact detection device.

[0028] In one of the embodiments, 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 groove opening of the installation groove.

[0029] In this embodiment, by forming a sealing layer, the non-contact detection device can be effectively sealed to protect its internal circuit 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 detection of the non-contact liquid level sensor not only improves the accuracy and reliability of the detection, but also avoids the risk of strong electric damage to the sensor caused by leakage of the electric heating pipe that may exist in the traditional water conduction sensing terminal. At the same time, since the non-contact liquid level sensor does not need to be in direct contact with water, the risk of water leakage caused by poor sealing is also reduced, further improving the safety and stability of the water heater.

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

[0033] A first current limiting filter circuit, which is connected in series between the output end of the first non-contact detection device and the first input end of the AND gate circuit;

[0034] A second current limiting filter circuit, which is connected in series between the output end of the second non-contact detection device and the second input end of the AND gate circuit;

[0035] A 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 interference between current and signal, which may not only affect the accurate judgment of the gate circuit on the signal, 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 burr ripple caused by the excessive length of the feedback signal line, and can effectively suppress the interference signal to 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 a role in filtering and limiting the final output signal again, which can not only protect the I / O port of the controller from potential current shocks, but also ensure 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 an output end of the first non-contact detection device, and a second end of the first current limiting resistor is connected to a first input end of an AND gate circuit;

[0039] A first ceramic capacitor, wherein a first end of the first ceramic capacitor is connected to a 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, 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 an output end of the second non-contact detection device, and a second end of the second current limiting resistor is connected to a 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 a 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 a 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 non-contact detection device to prevent the pin 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 a 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 breakdown 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 technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. 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] FIG1 is a schematic diagram of the structure of an anti-dry-burning water heater in an implementation;

[0054] FIG2 is a schematic structural diagram of an anti-dry-boiling water heater in another embodiment;

[0055] FIG3 is a schematic structural diagram of an anti-dry-boiling water heater in another embodiment;

[0056] FIG4a is a schematic diagram of the structure of an anti-electricity wall in an implementation;

[0057] FIG4b is a cross-sectional view of the anti-electrical wall in FIG4a;

[0058] FIG4c is a partial enlarged schematic diagram of area A in FIG4b;

[0059] FIG5 is a circuit diagram of a non-contact liquid level sensor in one embodiment;

[0060] FIG. 6 is a schematic structural diagram of an anti-dry-boiling water heater in yet 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 groove, 302-buckle, 304-groove, 306-elastic part, 50-sealing layer. DETAILED DESCRIPTION

[0062] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is 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 belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0064] It can be understood that the terms "first", "second", etc. used in the present application can be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0065] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like 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 accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional 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 intermediate 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 "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0068] Based on the reasons described in the background technology, in an exemplary embodiment, as shown in FIG1 , 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 reception 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, which can effectively avoid 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] Exemplarily, 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, so that the water heater is more convenient to install, repair and replace parts. The first non-contact detection device 12 is arranged on the outer wall of the detachable first insulating connector 10, and is used to obtain the first water flow signal of the water flow in the first pipe. Similarly, the second non-contact detection device 16 is arranged on the outer wall of the detachable second insulating connector 14, and is used to obtain the second water flow signal of the water flow in the second pipe. In the case of no direct contact with water, the corresponding water flow signal is generated by detecting the change of water flow in the pipe. 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. It can be further known from the structure of the water outlet pipe 6 and the water inlet pipe 8 in the water heater as shown in FIG1 that in order to make water flow through both the water inlet pipe 8 and the water outlet pipe 6, the inner tank 2 of the water heater is in a full water state at this time, and the controller 18 controls the heating tube 4 to start working to heat the water. If the controller 18 does not receive these two signals at the same time, for example, only the first water flow signal is received but the second water flow signal is not received, or both signals are not received, this means that the water volume in the inner tank 2 of the water heater is insufficient, and the water outlet pipe 6 may be blocked or the water inlet pipe 8 may be blocked. In this case, the controller 18 will stop the operation of the heating tube 4 to prevent the water heater from being damaged or causing a safety accident due to dry burning. It should be noted that the controller 18 can control the heating tube 4 through simple electronic components such as a single-chip microcomputer. For example, the first water flow signal and the second water flow signal can both be high-level signals, and when there is no water flow signal, they are low-level signals. The single-chip microcomputer will control the heating tube 4 to work only when it receives the above high-level signals at the same time. In addition, the controller 18 can also judge the size or speed of the water flow based on the strength or frequency of the received water flow signal, so as to achieve more precise control of the working state 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 the water heater from overheating or damage; 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 above-mentioned anti-dry-burning water heater can realize real-time monitoring and control of the working state of the water heater by using the non-contact detection device and the controller 18, which can effectively avoid the situation where the water heater has leakage and damages the detection device, thereby improving the safety and reliability of the water heater. In addition, the non-contact detection device is installed on the outer wall of the insulating connector, and the detachable setting of the insulating connector makes maintenance more convenient.

[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, as shown in FIG2 , 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] Exemplarily, when the water heater starts working, the first non-contact detection device 12 and the second non-contact detection device 16 start to monitor the water flow in the water inlet pipe 8 and the water outlet pipe 6, and output the corresponding water flow signal to the input end of the logic circuit 20. After receiving these two signals, the logic circuit 20 will perform a logical judgment. The specific judgment logic can be set according to the design requirements of the water heater. For example, the logic circuit 20 can be designed as follows: assuming that the first water flow signal and the second water flow signal are high-level signals, when high-level signals from two detection devices are received at the same time (indicating that there is water flow in both the water inlet pipe 8 and the water outlet pipe 6), a high-level signal is output to the input end of the controller 18; otherwise, a low-level signal or no signal is output. The controller 18 controls the operation of the heating tube 4 according to the signal output by the logic circuit 20. If the controller 18 receives a high-level signal from the logic circuit 20, it means that the logic circuit 20 determines that the water volume in the inner tank 2 of the water heater is sufficient, and the controller 18 will start the heating tube 4 for heating. 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 work may cause dry burning and damage the water heater.

[0076] It should be noted that, in addition to being designed as 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 when the second water flow signal is received within a certain period of time. This can prevent misjudgment caused by instantaneous water flow or interference signals.

[0077] In this embodiment, the logic circuit 20 plays the role of an intermediate processing layer, reducing the number of pins of the controller 18, reducing costs, simplifying the processing logic of the controller 18, and improving the reliability and stability of the entire system. In addition, the logic circuit 20 can also be customized and optimized as needed to adapt to different application scenarios and requirements.

[0078] In an exemplary embodiment, as shown in Fig. 3, the logic circuit 20 includes an AND gate circuit 202. 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.

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

[0080] Exemplarily, when the water heater starts to work, the two non-contact detection devices start to monitor the water flow in their respective pipes and output corresponding level signals to the input end of the AND gate circuit 202. Only when all the input ends of the AND gate circuit 202 receive high-level signals, will the high-level signal be output at its output end. Therefore, only when the first non-contact detection device 12 and the second non-contact detection device 16 detect the water flow and output the first water flow signal and the second water flow signal (high-level signal), the output end of the AND gate circuit 202 will output a high-level signal and transmit it to the input end of the controller 18. After the controller 18 receives the above-mentioned high-level signal, it determines that there is water flow in both the water inlet pipe 8 and the water outlet pipe 6, that is, the water volume in the inner tank 2 of the water heater is sufficient, so the controller 18 will start the heating tube 4 for heating according to the preset logic. If any non-contact detection device does not detect the water flow, or both do not detect it, the output end of the 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 logic AND operation of the output signals of the two non-contact detection devices, thereby ensuring that the heating tube 4 will only be started when there is water flow in the two pipes, thereby improving the safety and reliability of the water heater.

[0082] In an exemplary embodiment, as shown in FIG3 , the AND gate circuit 202 uses a chip of 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 according to the signal to prevent dry burning. Among them, the AND gate circuit 202 can also use an AND gate chip of model SN7408 or model CD4081. The specific judgment logic can refer to the following Table 1:

[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 reducing the cost, and the software logic judgment of the controller 18 is reduced, thereby reducing the occurrence of program misjudgment.

[0087] In an exemplary embodiment, as shown in FIG. 4 a , the first insulating connector 10 and the second insulating connector 14 are both anti-electrical walls, the anti-electrical 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.

[0088] Exemplarily, as shown in FIG4a, the non-contact detection device is installed in an insulating shell and has no contact with water. The anti-electricity wall serves as an insulating connector, and its core structure is an insulating shell. This shell 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 correspondingly attached to the insulating shell. 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 shell of the anti-electricity 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 anti-electric 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, as shown in Figures 4b and 4c, 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, a groove 304 is formed on the second inner wall of the mounting groove 30, and an elastic member 306 is arranged 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] Exemplarily, as shown in Figure 4c, Figure 4c is a partial enlarged schematic diagram of the mounting groove 30 in area A of Figure 4b. By setting a buckle 302 on the first inner wall of the mounting groove 30, and setting a groove 304 and an elastic member 306 on the second inner wall, during installation, the non-contact detection device is easily pushed forward by borrowing the slope of the buckle 302, 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 pushing 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, as shown in FIG. 4 b and FIG. 4 c , 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 disposed at the groove opening of the installation groove 30 .

[0093] Exemplarily, the sealing layer 50 may refer to a sealing layer formed of epoxy resin. The sealing layer 50 may be formed by sealing with a waterproof material such as epoxy resin, which may 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] Exemplarily, 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 shown in FIG5 , K1 is a metal sheet, K1 is close to the outer wall of the insulating shell, and is used to detect the capacitance value of the insulating shell; when the water level exceeds or the water flows through, the capacitance value of the insulating shell will change. By detecting the difference between the capacitance on the CIN2 pin and the capacitance on the CIN1 pin, when the capacitance on the CIN2 pin is greater than the capacitance on the CIN1 pin + 0.2PF, it is considered that water is detected, otherwise it is considered that no water is detected. During calibration, by adjusting the capacitance difference on the CIN1 and CIN2 pins, the specific water level detection point can be located. By adjusting the capacitance value of the CIN1 pin capacitor C1 (C1 is an adjustable capacitor used to adjust the precise water level point, generally with a capacitance value between 0-10PF), the capacitance on the CIN1 and CIN2 pins is made closer. Compared with the solution of using water-conducting sensing terminals, the use of non-contact liquid level sensors can prevent the electric leakage of the electric heating tube from damaging the sensor, and also eliminate the risk of water leakage due to poor sealing. The non-contact liquid level sensor determines whether there is water by comparing the capacitance value with and without 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 detection of the non-contact liquid level sensor not only improves the accuracy and reliability of the detection, but also avoids the risk of strong electric damage to the sensor caused by leakage of the electric heating pipe that may exist in the traditional water conduction sensing terminal. At the same time, since the non-contact liquid level sensor does not need to be in direct contact with water, the risk of water leakage caused by poor sealing is also reduced, further improving the safety and stability of the water heater.

[0097] In an exemplary embodiment, as shown in Fig. 6, 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 end of the first non-contact detection device 12 and the first input end of the AND gate circuit 202; the second current limiting filter circuit 206 is 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; the 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.

[0098] Exemplarily, in order to avoid the sudden current and signal voltage glitch ripple 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 18 I / O port, the above-mentioned problem is 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 interference between current and signal, which may not only affect the accurate judgment of the AND gate circuit 202 on the signal, but also damage 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 burr ripple caused by the excessive length of the feedback signal line, and can effectively suppress interference signals to 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 a role in filtering and limiting the final output signal again, which can not only protect the I / O port of the controller 18 from potential current shocks, but also ensure 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, as shown in FIG6 , 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] Exemplarily, taking the circuit structure shown in Figure 6 as an example, a first current limiting resistor R1 is added between the AND gate circuit 202 and the output end of the first non-contact 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 breakdown of the AND gate circuit 202, and 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. The first end of the second current limiting resistor R3 is connected to the output end of the second non-contact detection device 16, and the second end of the second current limiting resistor R3 is connected to the second input end of the AND gate circuit 202; the second ceramic capacitor C6, the first end of the second ceramic capacitor C6 is connected to the second input end of the AND gate circuit 202, and the second end of the second ceramic capacitor C6 is grounded; the second pull-down resistor R4, the first end of the second pull-down resistor R4 is connected to the first end of the second ceramic capacitor C6, and the second end of the second pull-down resistor R4 is grounded.

[0103] Exemplarily, taking the circuit structure shown in Figure 6 as an example, a second current limiting resistor R3 is added between the AND gate circuit 202 and the output end of 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, and 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 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 first end of the third ceramic capacitor C7 is connected to the input end 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] Exemplarily, taking the circuit structure shown in Figure 6 as an example, 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, and 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, as shown in FIG. 1 , the anti-dry-boiling water heater further includes a magnesium rod 22 , and the magnesium rod 22 is disposed in the inner tank of the electric water heater to prevent corrosion of the inner tank.

[0107] In the description of this specification, the descriptions with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc., mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0108] The technical features of the above embodiments may 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-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An anti-dry-burning water heater, It is 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 tank (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 pipeline, and the first pipeline being in communication with the water inlet pipe (8); A first non-contact detection device (12) is arranged on the 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) is arranged on the 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.

2. The anti-dry-burning water heater according to claim 1, It is 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, It is characterized in that The logic circuit (20) comprises 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) and the AND gate circuit (202).

4. The anti-dry-burning water heater according to claim 3, It is 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, It is characterized in that The first insulating connector (10) and the second insulating connector (14) are both anti-electricity walls, the anti-electricity walls comprising 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-burning water heater according to claim 5, It is characterized in that The insulating shells of the first insulating connector (10) and the second insulating connector (14) are both formed with a mounting groove (30); 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 arranged 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-burning water heater according to claim 6, It is 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 groove opening of the installation groove (30).

8. The anti-dry-boiling water heater according to any one of claims 2 to 6, It is 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-burning water heater according to claim 3, It is 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 an output end of the first non-contact detection device (12) and a 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 an output end of the second non-contact detection device (16) and a second input end of the AND gate circuit (202); A third current limiting filter circuit (208), the 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-burning water heater according to claim 9, It is 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; Or, the second current limiting filter circuit (206) comprises: 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) comprises: a third current limiting resistor R5, wherein a first end of the third current limiting resistor R5 is connected to an output end of the AND gate circuit (202), and a second end of the third current limiting resistor R5 is connected to an 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 a 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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