A heating and hot water system

Abstract

The utility model provides a kind of heating hot water system, belong to heating and hot water supply technical field.The heating hot water system, including electric heating device, expansion tank, pressure relief valve, water inlet pipeline, heating water pipeline, domestic water pipeline, heating return water pipeline, circulating pump and controller;The water inlet of electric heating device is connected with the water outlet of water inlet pipeline and the water outlet of heating return water pipeline;The water outlet of electric heating device is connected with the water inlet of heating water pipeline and the water inlet of domestic water pipeline;Heating water pipeline is connected with expansion tank by pressure relief pipeline, and pressure relief valve is set on pressure relief pipeline, for system overpressure protection;Circulating pump is set on heating return water pipeline;Electric heating device and circulating pump are electrically connected with controller, and controller controls the operation of electric heating device and circulating pump.Realized the dual-function supply of domestic hot water and heating hot water.Controller uniformly coordinates the operation of electric heating device and circulating pump, improves the automation level and operating stability of system.

Description

Technical Field

[0001] This utility model relates to the field of heating and hot water supply technology, and in particular to a heating and hot water system. Background Technology

[0002] As people's demands for living comfort and energy efficiency increase, electric heating and hot water systems that integrate domestic hot water and heating functions are gradually becoming more widespread. However, existing systems still have significant shortcomings in terms of safety protection, heating control, and water flow management. For example, most devices only use simple temperature control switches or relays to control heating, lacking multiple protection mechanisms against safety hazards such as leakage, overheating, and dry burning, resulting in poor electrical safety. At the same time, the heating power adjustment is crude and cannot achieve continuous power adjustment, leading to large water temperature fluctuations and high energy consumption. In addition, cold water and heating return water are usually directly mixed or supplied separately, failing to intelligently adjust the mixing ratio according to actual operating conditions, affecting preheating efficiency and heating response speed; hot water distribution also mostly relies on manual valves, unable to automatically switch between domestic hot water and heating water supply as needed, resulting in low system intelligence and integration. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a safe, reliable, energy-efficient, and intelligently controlled heating and hot water system.

[0004] A heating and hot water system is provided, comprising an electric heating device, an expansion tank, a pressure relief valve, an inlet pipe, a heating water pipe, a domestic water pipe, a heating return water pipe, a circulation pump, and a controller;

[0005] The inlet of the electric heating device is connected to the outlet of the inlet pipe and the outlet of the heating return water pipe.

[0006] The outlet of the electric heating device is connected to the inlet of the heating water pipeline and the inlet of the domestic water pipeline.

[0007] The heating water pipeline is connected to the expansion tank through a pressure relief pipeline, and a pressure relief valve is installed on the pressure relief pipeline for system overpressure protection.

[0008] The circulating pump is installed on the heating return water pipe;

[0009] The electric heating device and the circulating pump are electrically connected to the controller, and the controller controls the operation of the electric heating device and the circulating pump.

[0010] Furthermore, 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 overcurrent protection device.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] Specifically, when the over-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.

[0015] Furthermore, it also includes the first three-way directional valve;

[0016] The first inlet of the first three-way reversing valve is connected to the outlet of the water inlet pipe, the second inlet is connected to the outlet of the heating return water pipe, and its outlet is connected to the inlet of the electric heating device.

[0017] Furthermore, it also includes a second three-way directional valve;

[0018] The inlet of the second three-way reversing valve is connected to the outlet of the electric heating device;

[0019] The first outlet of the second three-way reversing valve is connected to the inlet of the heating water pipeline, and the second outlet is connected to the inlet of the domestic water pipeline.

[0020] Furthermore, the domestic water pipe is equipped with a domestic hot water temperature sensor and a flow meter;

[0021] The signal output terminals of the domestic hot water temperature sensor and the flow meter are both electrically connected to the controller.

[0022] Furthermore, a pressure switch and a flow switch are installed on the heating return water pipe;

[0023] The signal output terminals of both the pressure switch and the flow switch are electrically connected to the controller.

[0024] Furthermore, this also includes electrically controlled valves;

[0025] The electric control valve is installed on the water inlet pipe and is used to control the on / off of cold water supply;

[0026] The control terminal of the electric control valve is electrically connected to the controller, and the controller controls the opening or closing of the electric control valve.

[0027] Furthermore, it also includes an inlet water temperature sensor;

[0028] The inlet water temperature sensor is installed on the inlet water pipe to detect the temperature of the cold water entering the system;

[0029] The signal output terminal of the inlet water temperature sensor is electrically connected to the controller.

[0030] The controller adjusts the heating power of the electric heating device according to the cold water temperature and the set target temperature.

[0031] Furthermore, it also includes a water supply temperature sensor;

[0032] The water supply temperature sensor is installed at the outlet of the electric heating device to detect the heating water supply temperature;

[0033] The signal output terminal of the water supply temperature sensor is electrically connected to the controller.

[0034] The controller adjusts the heating power or start / stop status of the electric heating device based on the comparison result between the heating water supply temperature and the preset target temperature.

[0035] Furthermore, it also includes a housing; the electric heating device, the expansion tank, the pressure relief valve, the inlet pipe, the heating water pipe, the domestic water pipe, the heating return water pipe, the circulating pump, and the controller are all housed within the housing;

[0036] The inlet of the water inlet pipe, the outlet of the heating water pipe, the outlet of the domestic water pipe, and the return water outlet of the heating return water pipe extend to the outside of the outer casing for connecting to an external water source and a heating system.

[0037] The outer casing is also provided with an interface hole through which wires pass.

[0038] This utility model has the following advantages or beneficial effects:

[0039] 1. By integrating the electric heating device, expansion tank, pressure relief valve, inlet pipe, heating water pipe, domestic water pipe, heating return water pipe, circulating pump, and controller, a dual-function supply of domestic hot water and heating hot water is achieved. The controller coordinates the operation of the electric heating device and circulating pump, improving the system's automation level and operational stability. Simultaneously, the pressure relief valve, in conjunction with the expansion tank, provides overpressure protection, ensuring the system's operational safety.

[0040] 2. By setting up a residual current circuit breaker, an over-temperature protector, and a thyristor, a multi-level electrical safety protection mechanism is formed: the residual current circuit breaker effectively prevents the risk of leakage and ensures personal safety; the over-temperature protector is set close to the heating part and can quickly respond to overheating or dry burning and cut off the power supply in time; the thyristor is regulated by the controller to realize stepless control of heating power, avoiding the problems of large temperature fluctuations and high energy consumption caused by traditional on-off control, and improving heating accuracy and energy utilization efficiency.

[0041] 3. By installing a first three-way reversing valve at the water inlet of the electric heating device, the system can adjust and switch between connecting cold water from the inlet pipe or return water from the heating return pipe according to the system operating conditions (such as heating return water temperature, water demand, etc.).

[0042] 4. By installing a second three-way reversing valve at the outlet of the electric heating device, with its first outlet connected to the heating water pipeline and its second outlet connected to the domestic water pipeline, intelligent distribution of heated hot water is achieved. Under the control of the controller, this second three-way reversing valve can automatically switch or adjust the hot water flow direction according to the user's actual needs (e.g., by detecting the opening of domestic water supply through a flow meter), prioritizing or supplying water to either the domestic water pipeline or the heating water pipeline. This design effectively avoids the problem of unstable water temperature caused by crosstalk between domestic hot water and heating hot water in the pipeline, ensuring the immediacy and comfort of domestic hot water, while improving the intelligent control level and overall operational reliability of the system. Attached Figure Description

[0043] 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.

[0044] Figure 1 This is a schematic diagram of a first structure of a heating and hot water system according to an exemplary embodiment;

[0045] Figure 2 This is a schematic diagram of a second structure of a heating and hot water system according to an exemplary embodiment;

[0046] Figure 3 This is a schematic diagram of a third structure of a heating and hot water system according to an exemplary embodiment.

[0047] The reference numerals in the attached figures are explained as follows:

[0048] 1. Outer casing; 2. Electric heating device; 3. Expansion tank; 4. Pressure relief valve; 5. Inlet water pipe; 6. Heating water pipe; 7. Domestic water pipe; 8. Heating return water pipe; 9. Circulation pump; 10. Controller; 11. Residual current circuit breaker; 12. Over-temperature protector; 13. SCR; 14. First three-way reversing valve; 15. Second three-way reversing valve; 16. Domestic hot water temperature sensor; 17. Flow meter; 18. Pressure switch; 19. Flow switch; 20. Electric control valve; 21. Inlet water temperature sensor; 22. Supply water temperature sensor; 23. Pressure gauge; 24. Check valve; 25. Over-temperature protector. Detailed Implementation

[0049] 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.

[0050] 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.

[0051] Figure 1 This is a schematic diagram of a first structure of a heating and hot water system according to an exemplary embodiment; Figure 2 This is a schematic diagram of a second structure of a heating and hot water system according to an exemplary embodiment; Figure 3 This is a schematic diagram of a third structure of a heating and hot water system 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 product.

[0052] like Figures 1 to 3 As shown in the figure, a heating and hot water system according to an embodiment of the present invention integrates domestic hot water supply and heating circulation functions, and has the advantages of safety protection, intelligent control and high efficiency and energy saving. It is suitable for the hot water and heating needs of families or small commercial places.

[0053] The heating and hot water system mainly includes: 2. electric heating device, 3. expansion tank, 4. pressure relief valve, 5. inlet pipe, 6. heating water pipe, 7. domestic water pipe, 8. heating return water pipe, 9. circulation pump, 10. controller, and several sensors, valves and electrical protection components.

[0054] The electric heating device 2 can use an electric heating element (such as a metal tubular electric heating tube or a PTC heating element) or gas heating. Its inlet is connected to the outlet of the inlet pipe 5 and the outlet of the heating return water pipe 8 via a pipeline. The inlet pipe 5 is used to introduce external cold water, while the heating return water pipe 8 is connected to the return water outlet of the external heating system. The two are mixed and then enter the electric heating device 2 for heating.

[0055] The outlet of the electric heating device 2 is connected to the inlet of the heating water pipe 6 and the inlet of the domestic water pipe 7, respectively. The heated hot water can be supplied to both the heating system and the domestic hot water at the same time.

[0056] A pressure relief pipe is installed on the heating water pipe 6, which is connected to the expansion tank 3. A pressure relief valve 4 is installed on the pressure relief pipe. When the internal pressure of the system exceeds the set safety threshold, the pressure relief valve 4 automatically opens to release the excess water pressure to the outside (it can be connected to a drain hose), thereby achieving overpressure protection and preventing the system from being damaged due to excessive pressure.

[0057] A circulating pump 9 is installed on the heating return water pipe 8 to drive the heating return water to circulate within the system, thereby improving heat exchange efficiency. Both the circulating pump 9 and the electric heating device 2 are electrically connected to the controller 10, which controls their start / stop and operating parameters according to the system's operating status.

[0058] To further enhance system safety, this embodiment also includes a residual current circuit breaker 11, an overcurrent protection device 12, and a silicon controlled rectifier 13.

[0059] In one embodiment, the device further includes a residual current circuit breaker 11, a temperature limit protector 12, and a silicon controlled rectifier (SCR) 13. The output of the residual current circuit breaker 11 is divided into two paths: one path is connected to the power input of the controller 10, 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 13. The output of the SCR 13 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 10 is connected to the gate of the SCR 13 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 11 automatically cuts off the main power supply. When the controller 10 receives an abnormal temperature or flow signal, it controls the SCR 13 to stop outputting.

[0060] The residual current circuit breaker 11 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 10 to provide operating power to the controller 10; the other path is connected to the input terminal of the overcurrent protector 12 to supply power to the heating circuit.

[0061] 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 13, serving as the main control safety switch at the front end of the silicon controlled rectifier 13.

[0062] The output terminal of the thyristor 13 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 13 regulates the electrical energy supplied to the electric heating device 2 by changing its conduction angle, thereby achieving stepless adjustment of the heating power.

[0063] The control signal output terminal of the controller 10 is connected to the gate of the thyristor 13, and outputs a trigger signal to control the conduction and cutoff of the thyristor 13. The controller 10 dynamically adjusts the working state of the thyristor 13 based on feedback signals from the water temperature sensor 11, the flow switch 10, etc., to achieve intelligent heating control.

[0064] 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 13 and the electric heating device 2, realizing hardware-level over-temperature protection and preventing the risk of dry burning or fire.

[0065] When a leakage fault occurs in the system (such as a leakage current to ground exceeding 30mA), the leakage circuit breaker 11 will immediately trip automatically, cutting off the main power input and ensuring personal safety.

[0066] In addition, when the controller 10 receives signals such as abnormal temperature (e.g., excessively high outlet water temperature) or abnormal flow (e.g., circulation pump 3 not started, pipe blockage), it will actively stop outputting trigger signals to the gate of the thyristor 13, causing the thyristor 13 to turn off and stop heating output, thus realizing software-level protection control.

[0067] In summary, this embodiment achieves leakage protection through the leakage circuit breaker 11, hardware over-temperature power-off protection independent of the controller 10 through the over-temperature protector 12, precise adjustment of heating power through the thyristor 13, and intelligent operation and auxiliary protection through the controller 10, forming a multi-level, highly reliable safety control system.

[0068] Another embodiment of the system also includes a first three-way reversing valve 14, whose first inlet is connected to the outlet of the inlet pipe 5, the second inlet is connected to the outlet of the heating return pipe 8, and the outlet is connected to the inlet of the electric heating device 2.

[0069] The first three-way reversing valve 14 is adjusted to connect the inlet water pipe 5 or the heating return water pipe 8 as needed.

[0070] In one embodiment, an over-temperature protector 25 is also included. The over-temperature protector 25 is installed in the inlet water pipe 5 and / or the heating return water pipe 8, and is installed close to the silicon controlled rectifier 13 to detect the real-time temperature of the silicon controlled rectifier 13. When the over-temperature protector 25 detects that the temperature of the silicon controlled rectifier 13 exceeds the safety threshold, it controls the silicon controlled rectifier 13 to stop outputting (i.e., to stop working).

[0071] In one embodiment, a copper base is also included, which is installed on the inlet water pipe 5 and / or the heating return water pipe 8; the over-temperature protector 25 and the silicon controlled rectifier 13 are both installed on the copper base, and the low-temperature inlet or return water is used to dissipate heat and cool them down.

[0072] The copper base is fixed to the outer wall of the inlet water pipe 5 and / or the heating return water pipe 8 by clamping or welding. The over-temperature protector 25 and the silicon controlled rectifier 13 can also be fixed to the copper base in the same way. The over-temperature protector 25 monitors the temperature of the heating system's return and inlet water in real time.

[0073] The thyristor 13 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 thyristor 13 and the over-temperature protector 25 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 "thyristor → copper base → return water pipe → return water medium".

[0074] It should be noted that although the SCR 13 and the over-temperature protector 25 share the same thermally conductive substrate (copper base), their functions are independent:

[0075] The over-temperature protector 25 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.

[0076] 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.

[0077] In another embodiment of this system, a second three-way reversing valve 15 is provided at the water outlet of the electric heating device 2, with its inlet connected to the water outlet of the electric heating device 2, its first water outlet connected to the heating water pipe 6, and its second water outlet connected to the domestic water pipe 7.

[0078] The second three-way reversing valve 15 can selectively supply hot water to the heating system or domestic water supply based on user settings or commands from the controller 10. The second three-way reversing valve 15 is an electric three-way valve or a solenoid switching valve, and its control terminal is electrically connected to the controller 10 to achieve automatic distribution control. When domestic water use is detected, it automatically stops supplying hot water to the heating system.

[0079] A domestic hot water temperature sensor 16 and a flow meter 17 are installed on the domestic water pipe 7. The domestic hot water temperature sensor 16 is used to detect the water temperature at the outlet in real time, and the flow meter 17 is used to detect changes in the flow rate of domestic hot water.

[0080] The signal output terminals of the domestic hot water temperature sensor 16 and the flow meter 17 are both connected to the controller 10. The controller 10 determines whether there is a water demand based on the signal from the flow meter 17: when the detected flow rate is greater than the start threshold, it determines that water use is started; when the flow rate returns to zero and remains so for a certain period of time, it determines that water use is stopped.

[0081] During the water usage process, the controller 10 compares the feedback value of the domestic hot water temperature sensor 16 with the target outlet water temperature set by the user (such as 45℃), and dynamically adjusts the heating intensity of the electric heating device 2 by adjusting the output power of the thyristor 13, so as to achieve constant temperature control of the domestic hot water outlet water temperature.

[0082] A pressure switch 18 and a flow switch 19 are installed on the heating return water pipe 8 to monitor the system water pressure and circulation status.

[0083] The pressure switch 18 is used to detect the system pressure. When the water pressure is lower than the preset lower limit (e.g., 0.1 MPa), it is determined that the system is short of water, the pressure switch 18 is disconnected, and a water shortage signal is sent to the controller 10.

[0084] The flow switch 19 is used to detect whether the heating return water is flowing. When the flow rate is lower than the set threshold (such as 0.5L / min), it is determined that the circulation is stagnant or the system is shut down. The flow switch 19 is disconnected and a no-flow signal is sent to the controller 10.

[0085] Upon receiving a water shortage signal or a no-flow signal, the controller 10 automatically stops the operation of the electric heating device 2 and / or the circulating pump 9 to prevent dry burning or ineffective energy consumption, thereby improving system safety and reliability.

[0086] The system also includes an electric control valve 20, which is installed on the water inlet pipe 5 to control the on / off of external cold water supply.

[0087] The control terminal of the electric control valve 20 is electrically connected to the controller 10. When the system detects a pressure drop (such as due to water replenishment from the expansion tank 3 or water consumption), the controller 10 controls the electric control valve 20 to open and replenish cold water; when the pressure returns to the set range, the electric control valve 20 closes to achieve automatic water replenishment.

[0088] An inlet water temperature sensor 21 is installed on the inlet water pipe 5 to detect the temperature of the cold water entering the system in real time (i.e., the ambient inlet water temperature).

[0089] The sensor signal is input to the controller 10. The controller 10 adjusts the initial heating power of the electric heating device 2 in advance based on the temperature difference between the current inlet water temperature and the target temperature for heating or domestic hot water set by the user. For example, when the inlet water temperature is low in winter, the heating power is automatically increased to shorten the heating time and improve the response speed.

[0090] A water supply temperature sensor 22 is installed at the outlet of the electric heating device 2 or at the beginning of the heating water pipeline 6 to detect the actual water supply temperature.

[0091] The sensor signal is fed back to the controller 10. The controller 10 compares the detected temperature with the preset target temperature for heating water supply (e.g., 60°C). If the temperature is too low, the heating power is increased or heating is started; if the temperature reaches or exceeds the set value, the power is reduced or heating is stopped, thus achieving precise closed-loop control of the heating water supply temperature.

[0092] In this embodiment, all the above-mentioned components (including electric heating device 2, expansion tank 3, pressure relief valve 4, various pipelines, circulation pump 9, controller 10, etc.) are integrated and installed inside a housing 1 to form an integrated device, which is convenient for installation and maintenance.

[0093] The inlet of the inlet pipe 5, the outlet of the heating water pipe 6, the outlet of the domestic water pipe 7, and the return water of the heating return water pipe 8 are all led out from the outside of the outer casing 1 to connect to the external water source, heating network and water terminal.

[0094] The housing 1 has interface holes for power cords and signal lines to pass through, and is equipped with waterproof seals to ensure electrical safety and equipment protection level.

[0095] To further enhance the operational safety and status monitoring of the system, a preferred embodiment is provided, wherein a pressure gauge 23 is installed at the outlet of the heating water pipe 6, and a check valve 24 is installed at the inlet (i.e., the end entering the system) of the heating return water pipe 8, so as to realize real-time monitoring of system pressure and prevent backflow of media.

[0096] Specifically, a mechanical or digital pressure gauge 23 and a pressure relief valve 4 are installed near the outlet of the heating water pipe 6. The pressure gauge 23 is fixed to the pipe via a threaded interface or compression fitting, and its pressure-sensing element is connected to the inner cavity of the pipe to display the current water supply pressure of the heating system in real time. Operators or maintenance personnel can visually determine whether the system is within the normal pressure range by observing the reading of the pressure gauge 23, promptly detecting abnormalities such as water shortage, air blockage, poor circulation, or failure of the expansion tank 3, facilitating rapid troubleshooting and improving the maintainability and operational reliability of the system. When the pressure gauge 23 detects a pressure exceeding the preset pressure, the pressure relief valve 4 opens.

[0097] Meanwhile, a check valve 24 is installed at the inlet end of the heating return water pipe 8 (i.e., the inlet where it enters the equipment after connecting to the return water pipe of the external heating system). This check valve 24 adopts a spring-loaded or gravity-driven structure, and is installed with the direction of "allowing passage in the direction of return water flow, and blocking in the reverse direction." When the system stops running or the circulating pump 9 stops, the check valve 24 automatically closes to prevent backflow of hot water in the electric heating device 2 and the heating water pipe 6 due to gravity or system elevation differences, avoiding the phenomenon of "hot water backflow" and ensuring that the system always maintains a certain water pressure and volume, preventing the risk of dry burning.

[0098] Furthermore, the check valve 24 can prevent cross-flow interference between multiple parallel systems, which is especially important in systems where multiple devices share a piping network or in high-rise buildings. Combined with the monitoring function of the aforementioned pressure gauge 23, operators can confirm whether the check valve 24 is functioning correctly—for example, if the pressure gauge 23 reading drops rapidly after the system is shut down, it may indicate that the check valve 24 is not sealing properly or has failed, thus enabling indirect assessment of the critical valve's status.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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. A heating and hot water system, characterized in that, include: Electric heating device (2), expansion tank (3), pressure relief valve (4), water inlet pipe (5), heating water pipe (6), domestic water pipe (7), heating return water pipe (8), circulating pump (9) and controller (10); The inlet of the electric heating device (2) is connected to the outlet of the inlet pipe (5) and the outlet of the heating return pipe (8); The outlet of the electric heating device (2) is connected to the inlet of the heating water pipeline (6) and the inlet of the domestic water pipeline (7); The heating water pipeline (6) is connected to the expansion tank (3) through a pressure relief pipeline, and a pressure relief valve (4) is installed on the pressure relief pipeline for system overpressure protection; The circulating pump (9) is installed on the heating return water pipeline (8); The electric heating device (2) and the circulating pump (9) are electrically connected to the controller (10), and the controller (10) controls the operation of the electric heating device (2) and the circulating pump (9).

2. A heating and hot water system according to claim 1, characterized in that, It also includes a residual current circuit breaker (11), an overcurrent protection device (12), and a thyristor (13); The output of the leakage circuit breaker (11) is divided into two paths: one path is connected to the power input of the controller (10), and the other path is connected to the input of the overcurrent protector (12); 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 (13). The output terminal of the thyristor (13) 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 (10) is connected to the gate of the thyristor (13) 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 (10); when leakage occurs, the leakage circuit breaker (11) automatically cuts off the main power supply; when the controller (10) receives an abnormal temperature or flow signal, it controls the thyristor (13) to stop outputting.

3. A heating and hot water system according to claim 1, characterized in that, It also includes the first three-way directional valve (14); The first inlet of the first three-way reversing valve (14) is connected to the outlet of the water inlet pipe (5), the second inlet is connected to the outlet of the heating return water pipe (8), and its outlet is connected to the inlet of the electric heating device (2).

4. A heating and hot water system according to claim 1, characterized in that, It also includes a second three-way directional valve (15); The inlet of the second three-way reversing valve (15) is connected to the outlet of the electric heating device (2); The first outlet of the second three-way reversing valve (15) is connected to the inlet of the heating water pipeline (6), and the second outlet is connected to the inlet of the domestic water pipeline (7).

5. A heating and hot water system according to claim 1, characterized in that, The domestic water pipe (7) is equipped with a domestic hot water temperature sensor (16) and a flow meter (17); The signal output terminals of the domestic hot water temperature sensor (16) and the flow meter (17) are both electrically connected to the controller (10).

6. A heating and hot water system according to claim 1, characterized in that, The heating return water pipe (8) is equipped with a pressure switch (18) and a flow switch (19); The signal output terminals of the pressure switch (18) and the flow switch (19) are both electrically connected to the controller (10).

7. A heating and hot water system according to claim 1, characterized in that, It also includes an electrically controlled valve (20); The electric control valve (20) is installed on the water inlet pipe (5) and is used to control the on / off of cold water supply; The control terminal of the electric control valve (20) is electrically connected to the controller (10), and the controller (10) controls the opening or closing of the electric control valve (20).

8. A heating and hot water system according to claim 1, characterized in that, It also includes an inlet water temperature sensor (21); The inlet water temperature sensor (21) is installed on the inlet water pipe (5) to detect the temperature of the cold water entering the system; The signal output terminal of the inlet water temperature sensor (21) is electrically connected to the controller (10).

9. A heating and hot water system according to claim 1, characterized in that, It also includes a water supply temperature sensor (22); The water supply temperature sensor (22) is installed at the outlet of the electric heating device (2) to detect the heating water supply temperature; The signal output terminal of the water supply temperature sensor (22) is electrically connected to the controller (10).

10. A heating and hot water system according to claim 1, characterized in that, It also includes the outer casing (1); The electric heating device (2), the expansion tank (3), the pressure relief valve (4), the water inlet pipe (5), the heating water pipe (6), the domestic water pipe (7), the heating return water pipe (8), the circulating pump (9) and the controller (10) are all installed inside the outer casing (1); The inlet of the water inlet pipe (5), the outlet of the heating water pipe (6), the outlet of the domestic water pipe (7), and the return water outlet of the heating return water pipe (8) extend to the outside of the outer shell (1) for connecting the external water source and the heating system. The outer casing (1) is also provided with an interface hole through which the wire passes.

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