An electric boiler

Abstract

The utility model provides a kind of electric boiler, belong to thermal engineering technical field.The electric boiler includes: shell, electric heating device, circulating pump, heating pipe, water tank and controller;Electric heating device, circulating pump and water tank are arranged in the inside of shell;Water tank top is equipped with opening, opening is through to the outside of shell, for water and / or exhaust;Water tank outlet is connected with the inlet of circulating pump by pipeline, the outlet of circulating pump is connected to the water inlet of heating terminal equipment by heating pipe, the water outlet of heating terminal equipment is connected to the backwater inlet of water tank by backwater pipeline, constitutes circulating water path;The heating part of electric heating device is tightly contacted and thermally coupled to the outer wall of heating pipe;Controller is electrically connected with electric heating device and circulating pump respectively, is configured to start and stop electric heating device and / or circulating pump according to preset condition.Integrated electric heating, water pump, water tank, automatic exhaust water replenishment, intelligent control, compact structure, safe and efficient.

Description

Technical Field

[0001] This utility model relates to the field of thermal energy engineering technology, and in particular to an electric boiler. Background Technology

[0002] Electric boilers, as a clean and efficient heating source, are widely used in heating systems for homes, small commercial spaces, and residential buildings. Their basic principle is to use electricity to drive an electric heating device to heat circulating water, and then a circulating pump propels the hot water through heating terminal equipment (such as radiators and underfloor heating coils) to achieve spatial heating.

[0003] Existing electric boiler systems mostly adopt an open or semi-integrated structure, typically including independently installed electric heating units, external water tanks, external circulation pumps, air vents, and water supply devices. These systems present several problems in practical use, such as the need for additional installation space for components like the external water tank, pump, and air vent, which is particularly difficult to arrange in space-constrained home environments.

[0004] Furthermore, due to the independent arrangement of each component and its low reliability, problems may occur during long-term operation, resulting in high maintenance costs. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to provide an integrated electric boiler that combines an internal water tank, filtration, circulation, heating, multiple safety protections, and intelligent control. This overcomes the shortcomings of existing technologies, such as complex installation, inconvenient operation, and poor safety, and meets the needs of modern families for comfortable, safe, and intelligent heating equipment.

[0006] An electric boiler is provided, comprising: a shell, an electric heating device, a circulating pump, a heating element, a water tank, and a controller;

[0007] The electric heating device, the circulating pump, and the water tank are disposed inside the outer casing;

[0008] The water tank has an opening at the top, which extends to the outside of the outer shell, for adding water and / or venting air.

[0009] The outlet of the water tank is connected to the inlet of the circulating pump through a pipe, the outlet of the circulating pump is connected to the inlet of the heating terminal device through the heating pipe, and the outlet of the heating terminal device is connected to the return outlet of the water tank through a return water pipe, thus forming a circulating water circuit.

[0010] The heating element of the electric heating device is in close contact with and thermally coupled to the outer wall of the heating tube;

[0011] The controller is electrically connected to the electric heating device and the circulating pump respectively, and is configured to start and stop the electric heating device and / or the circulating pump according to preset conditions.

[0012] Furthermore, it also includes a filter, which is installed at the outlet of the water tank to filter impurities in the water flowing to the circulating pump.

[0013] Furthermore, the filter is a detachable structure, and the opening size at the top of the water tank allows the filter to be installed or removed via the opening.

[0014] Furthermore, this also includes water level sensors;

[0015] The water level sensor is installed inside the water tank to detect whether the water level is lower than a preset safety threshold, and is electrically connected to the controller.

[0016] The controller is configured to stop the electric heating device and / or trigger an alarm signal when a low water level signal is received.

[0017] Furthermore, flow switches are also included;

[0018] The flow switch is connected in series with the heating tube and is electrically connected to the controller;

[0019] The controller is configured to prevent the electric heating device from starting or turning off when the flow switch detects that the water flow is below a preset threshold.

[0020] Furthermore, it also includes a water temperature sensor;

[0021] The water temperature sensor is installed at the outlet of the heating pipe or on the water supply pipe leading to the heating terminal equipment, and is electrically connected to the controller.

[0022] The controller is configured to control the start / stop of the electric heating device or adjust its heating power based on the temperature value detected by the water temperature sensor.

[0023] Furthermore, it also includes an over-temperature protector;

[0024] The over-temperature protector is installed on the return water pipe and is electrically connected to the controller.

[0025] Furthermore, this also includes residual current circuit breakers, overcurrent protection devices, and silicon controlled rectifiers;

[0026] The output of the residual current circuit breaker is divided into two paths: one path is connected to the power input of the controller, and the other path is connected to the input of the over-temperature protector.

[0027] The extreme temperature protector is a normally closed temperature control switch, and its output terminal is connected to the power input terminal of the thyristor.

[0028] The output terminal of the thyristor is connected to one end of the electric heating device, and the other end of the electric heating device is connected to the neutral wire of the power supply.

[0029] The control signal output terminal of the controller is connected to the gate of the thyristor and is used to adjust its conduction state to control the heating power.

[0030] Specifically, when the extreme temperature protector detects that the temperature exceeds the safety threshold, it automatically disconnects the heating circuit and the power supply to the controller; when leakage occurs, the leakage circuit breaker automatically cuts off the main power supply; when the controller receives an abnormal temperature or flow signal, it controls the thyristor to stop outputting; when the extreme temperature protector receives a signal that the temperature of the thyristor exceeds the safety threshold, it controls the thyristor to stop outputting.

[0031] Furthermore, it also includes a copper base;

[0032] The copper base is installed on the return water pipe;

[0033] Both the over-temperature protector and the thyristor are mounted on the copper base, and are cooled by low-temperature return water.

[0034] Furthermore, it also includes a sealing cap, an exhaust overflow hole, and a hose;

[0035] The sealing cap is detachably mounted on the opening, for sealing the water tank while allowing water to be added through the opening;

[0036] The top of the water tank is provided with an exhaust overflow hole, which is connected to the hose, and the hose is used to guide the overflowing water or gas to the outside.

[0037] The embodiments of this utility model have the following advantages or beneficial effects:

[0038] By integrating the electric heating element, circulating pump, and water tank within the casing, and providing a top opening for water filling and venting, a compact and highly integrated circulating water system is created. This design not only reduces external piping connections, lowering installation complexity and leakage risks, but also enables intelligent control of the electric heating element and circulating pump via a controller, allowing for automatic start-up and shutdown based on preset conditions, thus improving user experience and system safety and efficiency. Furthermore, this design gives the electric boiler the ability to automatically vent air, further enhancing ease of use and system reliability. Attached Figure Description

[0039] The above and other features and advantages of this invention will become more apparent from a detailed description of exemplary embodiments with reference to the accompanying drawings.

[0040] Figure 1 This is a schematic diagram of a first structure of an electric boiler according to an exemplary embodiment;

[0041] Figure 2 This is a schematic diagram of a second structure of an electric boiler according to an exemplary embodiment;

[0042] Figure 3 This is a schematic diagram of the structure of a filter in an electric boiler according to an exemplary embodiment.

[0043] The reference numerals in the attached figures are explained as follows:

[0044] 1. Outer casing; 2. Electric heating device; 3. Circulating pump; 4. Heating element; 5. Water tank; 6. Controller; 7. Opening; 8. Filter; 9. Water level sensor; 10. Flow switch; 11. Water temperature sensor; 12. Limit temperature protector; 13. Residual current circuit breaker; 14. Over-temperature protector; 15. SCR; 16. Snap ring; 17. Sealing cap; 18. Exhaust overflow hole; 19. Hose. Detailed Implementation

[0045] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0046] The terms “a,” “one,” “the,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended meaning of inclusion and that other elements / components / etc. may exist in addition to the listed elements / components / etc.

[0047] Figure 1 This is a schematic diagram of a first structure of an electric boiler according to an exemplary embodiment; Figure 2 This is a schematic diagram of a second structure of an electric boiler according to an exemplary embodiment; Figure 3 This is a schematic diagram of the structure of a filter in an electric boiler according to an exemplary embodiment. The above schematic diagram is only for illustrating the structural relationships related to the inventive point and is not intended as an actual scale of a real product.

[0048] like Figures 1 to 3As shown in the figure, an electric boiler according to an embodiment of the present invention includes: a shell 1, an electric heating device 2, a circulating pump 3, a heating tube 4, a water tank 5, and a controller 6; the electric heating device 2, the circulating pump 3, and the water tank 5 are disposed inside the shell 1; the top of the water tank 5 is provided with an opening 7, which extends to the outside of the shell 1 for adding water and / or venting; the outlet of the water tank 5 is connected to the inlet of the circulating pump 3 through a pipe, the outlet of the circulating pump 3 is connected to the inlet of the heating terminal device through the heating tube 4, and the outlet of the heating terminal device is connected to the return outlet of the water tank 5 through a return water pipe, forming a circulating water circuit; the heating part of the electric heating device 2 is in close contact with and thermally coupled to the outer wall of the heating tube 4; the controller 6 is electrically connected to the electric heating device 2 and the circulating pump 3 respectively, and is configured to start and stop the electric heating device 2 and / or the circulating pump 3 according to preset conditions.

[0049] The outlet of water tank 5 is connected to the inlet of circulating pump 3 through a pipe. The outlet of circulating pump 3 sends water to the heating terminal equipment (such as radiators or underfloor heating) through heating pipe 4. The outlet of the heating terminal equipment then returns to the inlet of water tank 5 through the return water pipe, forming a closed circulation system.

[0050] The outer casing 1 provides protection and support, ensuring the safety and stability of the internal components. The electric heating device 2, the circulating pump 3, and the water tank 5 are all housed inside the outer casing 1, ensuring the integrity and safety of the equipment.

[0051] The circulation pump 3 is used to circulate water throughout the system, ensuring even heat distribution.

[0052] The electric heating device 2 is responsible for heating water. Its heating element can be located inside the heating tube 4 or in close contact with the outer wall of the heating tube 4. It converts electrical energy into heat energy through elements such as resistance wire. The heating element of the electric heating device 2 can be placed directly inside the heating tube 4 or in close contact with the outer wall of the heating tube 4, and heats the water flowing through the heating tube 4 by utilizing the principle of heat conduction.

[0053] Heating element 4 is typically made of high-efficiency thermal conductive materials to improve thermal efficiency.

[0054] The water tank 5 stores water to be heated and has an opening 7 that extends to the outside of the outer shell 1, making it convenient for users to add water to the water tank 5 and effectively removing air from the system to prevent air lock from affecting the circulation effect.

[0055] Controller 6 is the core control unit, monitoring and regulating the operating status of the entire system, including starting / stopping the electric heating device 2 and the circulating pump 3. It can also receive data from various sensors (such as temperature, flow rate, etc.) and automatically start / stop the electric heating device 2 and the circulating pump 3 based on preset conditions, thereby achieving intelligent control.

[0056] In one embodiment, a filter 8 is further included, which is disposed at the outlet of the water tank 5 for filtering impurities in the water flowing toward the circulation pump 3. The filter 8 is a detachable structure, and the size of the opening 7 at the top of the water tank 5 allows the filter 8 to be installed or removed via the opening 7.

[0057] like Figure 3 As shown, the filter 8 is oval in shape (elliptical streamlined shape), with rounded ends and a slightly wider middle. This shape helps to reduce water flow resistance, improve water flow efficiency, avoid internal dead corners, prevent impurity accumulation, improve pressure resistance, and adapt to pressure fluctuations in closed-loop systems.

[0058] A retaining ring 16 is provided in the middle of the widest part of the filter 8. The retaining ring 16 is used to fix the filter 8 in the installation position and prevent it from moving under the impact of water flow.

[0059] With the plane where the retaining ring 16 is located as the plane of symmetry, the filter 8 has an overall symmetrical structure, which facilitates installation in both directions and is also beneficial for mold manufacturing and mass production.

[0060] The inner shape of the outlet cavity of water tank 5 precisely matches the lower part of filter 8, and the lower part of filter 8 is inserted into the outlet. The retaining ring 16 acts as a limit to prevent excessive insertion. The plug-in design allows users or maintenance personnel to quickly replace or clean the filter element without disassembling the piping.

[0061] To facilitate the disassembly and assembly of filter 8 and to ensure ease of maintenance, the outlet of water tank 5 and the opening 7 on the top of water tank 5 are designed to be in corresponding positions.

[0062] The outlet of water tank 5 is positioned near the bottom of water tank 5, ensuring that its vertical projection is directly below or near the top opening 7 of water tank 5. This layout allows users to remove the filter 8 directly from the top opening 7 of water tank 5 without moving the entire device or using additional tools.

[0063] In one embodiment, a water level sensor 9 is also included; the water level sensor 9 is disposed inside the water tank 5 and is used to detect whether the water level is lower than a preset safety threshold, and is electrically connected to the controller 6; the controller 6 is configured to control the electric heating device 2 to stop working and / or trigger an alarm signal when a low water level signal is received.

[0064] A water level sensor 9 is installed inside the water tank 5 to detect whether the water level is below a preset safety threshold, and is electrically connected to the controller 6. When the water level is too low, the controller 6 can take corresponding measures to ensure system safety.

[0065] The water level sensor 9 should be installed in a suitable location within the water tank 5 to accurately monitor water level changes. Typically, it will be installed near the bottom of the water tank 5 but above the minimum permissible water level. This ensures the sensor can reliably detect the minimum safe water level, preventing the electric heating device 2 from operating when there is no water or the water level is low.

[0066] Depending on actual needs and cost considerations, different types of water level sensors can be selected, such as capacitive sensing, float type, electrode type, and ultrasonic type. Each type has its advantages and disadvantages. For example, float type is simple and reliable but may be affected by water flow, while ultrasonic type has high accuracy but higher cost.

[0067] The water level sensor 9 is electrically connected to the controller 6 via a cable, transmitting water level information to the controller 6 in real time. The controller 6 determines whether the current water level is below a preset safety threshold based on the received data and responds accordingly.

[0068] Controller 6 is configured to automatically perform one or all of the following actions upon receiving a low water level signal:

[0069] Stop the operation of electric heating device 2: Immediately disconnect the power supply to electric heating device 2 to prevent dry burning and other safety hazards.

[0070] Triggering alarm signals: Users can be notified of a low water level through audible and visual alarms, display screen prompts, etc., to remind them to replenish water in time.

[0071] Record fault information: Record this event to facilitate subsequent maintenance and troubleshooting.

[0072] In one embodiment, a flow switch 10 is also included; the flow switch 10 is connected in series with the heating tube 4 and electrically connected to the controller 6; the controller 6 is configured to prohibit the start or stop of the electric heating device 2 when the flow switch 10 detects that the water flow is lower than a preset threshold.

[0073] To further improve the safety and reliability of the electric boiler system and prevent the electric heating device 2 from operating in a state of no water or low water flow (i.e., "dry burning"), a flow switch 10 can be added.

[0074] The flow switch 10 is used to monitor the water flow status through the heating pipe in real time. When the water flow velocity in the system is lower than the preset threshold (such as due to the failure of the circulating pump 3, pipe blockage, or water shortage in the system), the flow switch 10 automatically sends a signal. This prevents the electric heating device 2 from being powered on and heating without sufficient cooling medium (water) flow, thus avoiding overheating, equipment damage, or even safety accidents.

[0075] The flow switch 10 is connected in series to the heating tube and is usually installed between the outlet of the circulating pump 3 and the electric heating device 2.

[0076] The flow switch 10 is connected to the input port of the controller 6 via a wire, and outputs a switching signal (such as a normally open / normally closed contact) or an analog signal (in some advanced models). The controller 6 reads this signal in real time to determine whether there is sufficient water flow.

[0077] When the flow switch 10 detects that the water flow is below a preset threshold, the electric heating device 2 should be prevented from starting or immediately shut off. Specific actions include:

[0078] After the user sets the heating mode, the controller 6 first checks the status of the flow switch 10. If insufficient water flow is not detected (e.g., the circulation pump 3 is not started or the system is not full of water), the electric heating device 2 is prohibited from starting, and the operation panel displays "Abnormal water flow" or "System not circulating".

[0079] If the flow rate suddenly drops below the threshold after heating has started, the controller 6 will immediately cut off the power to the electric heating device 2 and enter a protection state. When the water flow returns to normal, the controller 6 can automatically restart heating (it needs to be set to automatic recovery mode), or it needs to be manually reset to ensure safety.

[0080] In one embodiment, a water temperature sensor 11 is also included; the water temperature sensor 11 is disposed at the outlet end of the heating pipe or on the water supply pipe leading to the heating terminal device, and is electrically connected to the controller 6; the controller 6 is configured to control the start / stop of the electric heating device 2 or adjust its heating power according to the temperature value detected by the water temperature sensor 11.

[0081] To achieve precise control and safety protection of the heating process in the electric boiler system, a water temperature sensor 11 is added. This sensor is used to monitor the temperature of the water after heating in real time and feeds the signal back to the controller 6, thus forming a closed-loop temperature control system.

[0082] The water temperature sensor 11 is used to detect the temperature of the water flowing out of the heating tube 4 in real time and to ensure that the measured value can accurately reflect the current heating status of the system. Common water temperature sensors 11 include NTC (negative temperature coefficient thermistor) or PT100 platinum resistance thermometer, which have the characteristics of fast response, high accuracy and good stability.

[0083] The water temperature sensor 11 is located at the outlet of the heating tube 4, that is, after the electric heating device 2, at the outlet section where the water flows out of the heating chamber. The water temperature is highest here, which best reflects the heating effect and is suitable for overheat protection and heating start / stop control.

[0084] The water temperature sensor 11 is electrically connected to the analog input port of the controller 6 via a shielded cable, and outputs an electrical signal proportional to the water temperature to the controller 6 in real time. The controller 6's built-in algorithm converts the signal into an actual temperature value (unit: °C) for subsequent control decisions.

[0085] In one embodiment, an over-temperature protector 14 is also included; the over-temperature protector 14 is disposed on the return water pipe and electrically connected to the controller 6.

[0086] In one embodiment, the device further includes a residual current circuit breaker 13, a temperature limit protector 12, and a silicon controlled rectifier (SCR) 15. The output of the residual current circuit breaker 13 is divided into two paths: one path is connected to the power input of the controller 6, and the other path is connected to the input of the temperature limit protector 12. The temperature limit protector 12 is a normally closed temperature control switch, and its output is connected to the power input of the SCR 15. The output of the SCR 15 is connected to one end of the electric heating device 2, and the other end of the electric heating device 2 is connected to the neutral wire. The control signal output of the controller 6 is connected to the gate of the SCR 15 to adjust its conduction state to control the heating power. When the temperature limit protector 12 detects that the temperature exceeds the safety threshold, it automatically disconnects the heating circuit. When leakage occurs, the residual current circuit breaker 13 automatically cuts off the main power supply. When the controller 6 receives an abnormal temperature or flow signal, it controls the SCR 15 to stop outputting.

[0087] The residual current circuit breaker 13 is installed at the power input terminal to detect whether there is a leakage fault in the line. Its output terminal is divided into two paths: one path is connected to the power input terminal of the controller 6 to provide operating power to the controller 6; the other path is connected to the input terminal of the overcurrent protector 12 to supply power to the heating circuit.

[0088] The extreme temperature protector 12 is a normally closed temperature control switch, which is in the conducting state under normal conditions, allowing current to flow. The extreme temperature protector 12 is installed close to or near the heating element of the electric heating device 2, and can directly sense the temperature change of the heating element. Its output terminal is connected to the power input terminal of the silicon controlled rectifier 15, serving as the main control safety switch at the front end of the silicon controlled rectifier 15.

[0089] The output terminal of the thyristor 15 is connected to one end of the electric heating device 2, and the other end of the electric heating device 2 is connected to the neutral wire of the power supply, forming a complete AC heating circuit. As a power regulating element, the thyristor 15 regulates the electrical energy supplied to the electric heating device 2 by changing its conduction angle, thereby achieving stepless adjustment of the heating power.

[0090] The control signal output terminal of the controller 6 is connected to the gate of the thyristor 15, and outputs a trigger signal to control the conduction and cutoff of the thyristor 15. The controller 6 dynamically adjusts the working state of the thyristor 15 based on feedback signals from the water temperature sensor 11, the flow switch 10, etc., to achieve intelligent heating control.

[0091] During operation, if the over-temperature protector 12 detects that the temperature of the heating element exceeds the preset safety threshold (such as 95℃~120℃), its internal bimetallic strip will activate and automatically disconnect the contacts, thereby cutting off the power supply to the thyristor 15 and the electric heating device 2, realizing hardware-level over-temperature protection and preventing the risk of dry burning or fire.

[0092] When a leakage fault occurs in the system (such as a leakage current to ground exceeding 30mA), the leakage circuit breaker 13 will immediately trip automatically, cutting off the main power input and ensuring personal safety.

[0093] In addition, when the controller 6 receives signals such as abnormal temperature (e.g., excessively high outlet water temperature) or abnormal flow (e.g., circulation pump 3 not starting, pipe blockage), it will actively stop outputting trigger signals to the gate of the thyristor 15, causing the thyristor 15 to turn off and stop heating output, thus achieving software-level protection control.

[0094] In summary, this embodiment achieves leakage protection through the leakage circuit breaker 13, hardware over-temperature power-off protection independent of the controller 6 through the over-temperature protector 12, precise adjustment of heating power through the thyristor 15, and intelligent operation and auxiliary protection through the controller 6, forming a multi-level, highly reliable safety control system.

[0095] In one embodiment, a copper base is also included, which is installed on the return water pipe; the over-temperature protector 14 and the silicon controlled rectifier 15 are both installed on the copper base, and the low-temperature return water is used to dissipate heat and cool them down.

[0096] The copper base is fixed to the outer wall of the return water pipe by clamping or welding. The over-temperature protector 14 and the silicon controlled rectifier 15 can also be fixed to the copper base in the same way. The over-temperature protector 14 monitors the temperature of the return water in the heating system in real time.

[0097] The silicon controlled rectifier (SCR) 15 is a power electronic component used to regulate the heating power of the electric heating device 2, and it generates a large amount of heat during operation. To achieve effective heat dissipation, in this embodiment, the SCR 15 and the over-temperature protector 14 are mounted on a copper base. Since the copper shell is in close contact with the return water pipe, the low-temperature return water continuously carries away the heat from the copper shell as it flows through the pipe, thus forming an effective heat dissipation path from "SCR → copper base → return water pipe → return water medium".

[0098] It should be noted that although the SCR 15 and the over-temperature protector 14 share the same thermally conductive substrate (copper base), their functions are independent:

[0099] The over-temperature protector 14 is responsible for sending a signal to the controller when the return water temperature rises abnormally (such as exceeding 90°C), and the controller then controls the thyristor to stop the output.

[0100] This integrated heat dissipation structure fully utilizes the cooling capacity of the return water pipes, eliminating the need for additional air cooling or independent water cooling systems, saving space and improving energy efficiency. Meanwhile, the copper casing combines fast temperature response with excellent thermal conductivity, achieving an integrated design of safety protection and power device heat dissipation.

[0101] Specifically, the electric heating device 2 has multiple positive electrodes.

[0102] When there is only one thyristor 15 and it is connected to two electrical terminals, the output terminal of the thyristor 15 is simultaneously connected to the positive terminals of multiple electric heating devices 2.

[0103] When there are multiple thyristors 15 (e.g., three), the multiple thyristors 15 are connected in parallel, and the output terminal of each thyristor 15 is connected to the positive terminal of at least one electric heating device 2.

[0104] In one embodiment, the system further includes a sealing cap 17, an vent overflow hole 18, and a hose 19; the sealing cap 17 is detachably disposed on the opening 7 to seal the water tank 5 while allowing water to be added through the opening 7; the top of the water tank 5 is provided with an vent overflow hole 18, which is connected to the hose 19, which is used to guide overflowing water or gas to the outside.

[0105] Under normal operating conditions, the opening 7 is closed by a removable sealing cap 17. The sealing cap 17 uses a heat-resistant rubber gasket in conjunction with a threaded or snap-fit ​​structure to achieve a waterproof seal, while allowing the user to open it for water replenishment or system venting when needed.

[0106] In addition, an vent overflow hole 18 is provided at another location on the top of the water tank 5. This hole is not used for daily water filling, but is connected to a heat-resistant hose 19 (such as a silicone hose or a PVC reinforced hose). The free end of the hose 19 extends to the bottom of the housing or an external safe area (such as near a floor drain) to drain excess water or entrained gas generated by thermal expansion during system operation.

[0107] When the system pressure is too high or the water temperature rises suddenly, causing the water to expand, the excess water flows through the vent overflow hole 18 and is discharged through the hose 19 to prevent the water tank from deforming or leaking.

[0108] The design of separating the sealing cap 17 from the exhaust overflow hole 18 avoids the contradiction of the traditional single opening having to both seal and vent, thus improving safety and reliability.

[0109] As a functional module in this application, the water tank's specific installation location, external structure (such as rectangular, circular, or other shapes), arrangement of inlet and outlet, and material (such as plastic, metal, or other corrosion-resistant and pressure-resistant materials) can all be adaptively adjusted according to actual design requirements. As long as it is still used to store circulating water and achieves water filling and venting functions through the top opening, any changes in the water tank's specific form or layout fall within the reasonable extension and protection scope of the technical solution in this application.

[0110] In this embodiment of the invention, the term "multiple" refers to two or more, unless otherwise explicitly defined. The terms "install," "connect," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0111] In the description of the embodiments of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0112] In this specification, the terms "an embodiment," "a preferred embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0113] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electric boiler, characterized in that, include: The outer casing (1), electric heating device (2), circulating pump (3), heating tube (4), water tank (5), and controller (6); The electric heating device (2), the circulating pump (3) and the water tank (5) are disposed inside the outer casing (1); The water tank (5) has an opening (7) at the top, which extends to the outside of the outer shell (1) for adding water and / or venting air; The outlet of the water tank (5) is connected to the inlet of the circulating pump (3) through a pipe. The outlet of the circulating pump (3) is connected to the inlet of the heating terminal equipment through the heating pipe (4). The outlet of the heating terminal equipment is connected to the return water outlet of the water tank (5) through the return water overheat protector pipe, thus forming a circulating water circuit. The heating part of the electric heating device (2) is in close contact with and thermally coupled to the outer wall of the heating tube (4); The controller (6) is electrically connected to the electric heating device (2) and the circulating pump (3) respectively, and is configured to start and stop the electric heating device (2) and / or the circulating pump (3) according to preset conditions.

2. An electric boiler according to claim 1, characterized in that, It also includes a filter (8), which is located at the outlet of the water tank (5) and is used to filter impurities in the water flowing to the circulation pump (3).

3. An electric boiler according to claim 2, characterized in that, The filter (8) is a detachable structure, and the size of the opening (7) at the top of the water tank (5) allows the filter (8) to be installed or removed via the opening (7).

4. An electric boiler according to claim 1, characterized in that, It also includes a water level sensor (9); The water level sensor (9) is installed inside the water tank (5) to detect whether the water level is lower than the preset safety threshold and is electrically connected to the controller (6); The controller (6) is configured to control the electric heating device (2) to stop working and / or trigger an alarm signal when a low water level signal is received.

5. An electric boiler according to claim 1, characterized in that, It also includes a flow switch (10); The flow switch (10) is connected in series with the heating tube (4) and electrically connected to the controller (6); The controller (6) is configured to prevent the electric heating device (2) from starting or turning off when the flow switch (10) detects that the water flow is below a preset threshold.

6. An electric boiler according to claim 1, characterized in that, It also includes a water temperature sensor (11); The water temperature sensor (11) is installed at the outlet of the heating pipe (4) or on the water supply pipe leading to the heating terminal equipment, and is electrically connected to the controller (6). The controller (6) is configured to control the start / stop of the electric heating device (2) or adjust its heating power based on the temperature value detected by the water temperature sensor (11).

7. An electric boiler according to claim 1, characterized in that, It also includes an over-temperature protector (14); The over-temperature protector (14) is installed on the return water pipe and is electrically connected to the controller (6).

8. An electric boiler according to claim 7, characterized in that, It also includes a residual current circuit breaker (13), an overcurrent protection device (12), and a thyristor (15); The output of the leakage circuit breaker (13) is divided into two paths: one path is connected to the power input of the controller (6), and the other path is connected to the input of the over-temperature protector (14). The extreme temperature protector (12) is a normally closed temperature control switch, and its output terminal is connected to the power input terminal of the thyristor (15). The output terminal of the thyristor (15) is connected to one end of the electric heating device (2), and the other end of the electric heating device (2) is connected to the neutral wire of the power supply. The control signal output terminal of the controller (6) is connected to the gate of the thyristor (15) to adjust its conduction state to control the heating power; When the extreme temperature protector (12) detects that the temperature exceeds the safety threshold, it automatically disconnects the power supply to the heating circuit and the controller (6); when leakage occurs, the leakage circuit breaker (13) automatically cuts off the main power supply; when the controller (6) receives an abnormal temperature or flow signal, it controls the thyristor (15) to stop output; when the extreme temperature protector (12) receives a signal that the temperature of the thyristor (15) exceeds the safety threshold, it controls the thyristor (15) to stop output.

9. An electric boiler according to claim 8, characterized in that, It also includes a copper base, The copper base is installed on the return water pipe; The over-temperature protector (14) and the thyristor (15) are both mounted on the copper base and cooled by low-temperature return water.

10. An electric boiler according to claim 1, characterized in that, It also includes a sealing cap (17), an exhaust overflow hole (18), and a hose (19); The sealing cap (17) is detachably mounted on the opening (7) to seal the water tank (5) while allowing water to be added through the opening (7); The top of the water tank (5) is provided with an exhaust overflow hole (18), which is connected to the hose (19). The hose (19) is used to guide the overflowing water or gas to the outside.

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