Water circuit control device for wall-hung boilers with small temperature differences

Abstract

This utility model discloses a water circuit control device for a wall-hung boiler with a small temperature difference, including a domestic water pipeline control system and a heating water pipeline control system. The heating water pipeline control system includes an inlet valve connected to a hot water inlet connector. The inlet valve is connected to a coupling tank through a first hot water inlet connector, where the hot water undergoes primary coupling. The first hot water outlet connector of the coupling tank is connected to one end of the heating pipeline, and the other end of the heating pipeline is connected to a heating return water connector. The heating return water connector is connected to a second hot water inlet connector of the coupling tank, where the heated hot water undergoes secondary coupling. The second hot water outlet connector of the coupling tank is connected to a heating return water pump. This utility model performs secondary coupling of the heating hot water within the coupling tank, reducing the temperature difference between the hot water inlet and outlet, avoiding temperature imbalances in large building areas, and achieving the technical advantages of a large flow rate and small temperature difference in the heating system.

Description

Technical Field

[0001] This utility model relates to the field of water flow control technology for wall-hung boilers, and particularly to a water circuit control device for wall-hung boilers with small temperature differences. Background Technology

[0002] With the improvement of living standards, wall-hung boilers have become an indispensable hot water supply device for modern families due to their advantages such as rapid heating, ease of use, and high energy efficiency. However, the performance of traditional wall-hung boilers is often unsatisfactory in certain usage scenarios. For example, when connected to a floor heating system with a long water circuit or when multiple water points are connected simultaneously, the hydraulic balance and temperature stability of the system will face challenges.

[0003] Specifically, when the load (such as water consumption) at the hot water outlet changes rapidly, it directly causes significant fluctuations in the flow rate through the boiler's heat exchanger. These flow fluctuations, in turn, affect the boiler's combustion stability and heat exchange efficiency, easily leading to inconsistent outlet water temperatures and impacting user experience. Furthermore, for systems connected to high-inertia loads such as underfloor heating, the underfloor heating coils themselves have significant thermal inertia, requiring a relatively stable and high-flow-rate hot water supply. If the underfloor heating system is directly connected to the boiler, the opening and closing of other water points (such as sinks) will cause drastic changes in the entire system's flow rate. This not only leads to unstable underfloor heating water temperature, affecting heating comfort, but may also trigger the boiler's overheat protection or cause frequent start-ups and shutdowns due to rapid changes in return water temperature, reducing equipment lifespan and energy efficiency.

[0004] Furthermore, the existing flow sensor structural design has shortcomings. The reliability of its rotor and sealing structure directly affects the stability and measurement accuracy of the water system. Traditional flow sensors are prone to wear or seal failure after long-term use, leading to increased measurement errors and further complicating the control of the water system.

[0005] Therefore, effectively isolating the direct impact of flow fluctuations on the heat source side within the water circuit system of a wall-hung boiler, stabilizing the outlet water temperature, while simultaneously accommodating the needs of different types of loads (such as fast-response bathing water and high-inertia load underfloor heating), avoiding temperature imbalances within large building sections, and improving the reliability and measurement accuracy of flow sensors have become pressing technical challenges for those skilled in the art. Existing technologies urgently need improvement to address these issues. Utility Model Content

[0006] The purpose of this invention is to provide a water circuit control device for a wall-hung boiler with a small temperature difference, which has the advantages of effectively isolating the direct impact of load-side flow fluctuations on the heat source side, stabilizing the outlet water temperature, and improving system stability.

[0007] This application provides a water circuit control device for a wall-hung boiler with a small temperature difference, including a domestic water pipeline control system and a heating water pipeline control system with inlet valve switching. The heating water pipeline control system includes an inlet valve connected to a hot water inlet connector. The inlet valve is connected to a coupling tank through a first hot water inlet connector, where the hot water undergoes primary coupling. The first hot water outlet connector of the coupling tank connects to one end of the heating pipeline, and the other end of the heating pipeline connects to a heating return water connector. The heating return water connector connects to a second hot water inlet connector of the coupling tank, where the heated hot water undergoes secondary coupling. The second hot water outlet connector of the coupling tank connects to a heating return water pump. This utility model performs secondary coupling of the heating hot water within the coupling tank, reducing the temperature difference between the hot water inlet and outlet, avoiding temperature imbalances in large building areas, and achieving the technical advantages of a large flow rate and small temperature difference in the heating system.

[0008] The inlet valve includes a motor-controlled three-way valve that switches the hot water flow to either the first hot water inlet connector or the hot water exchange inlet connector. The hot water exchange inlet connector is located on the heat exchange plate and is connected to the hot water exchange outlet connector. The heat exchange plate is also equipped with interconnected domestic water inlet connectors and domestic water outlet connectors. The domestic water outlet connector is connected to the domestic hot water outlet pipe via a conversion connector, and the domestic hot water outlet pipe is connected to the domestic hot water outlet connector. A connecting connector is provided between the inlet valve and the first hot water inlet connector.

[0009] A heating water supply pump and a heating water outlet are provided between the first hot water outlet joint and the heating pipe.

[0010] The heating return water pump is connected to the first heating return water pipe through a three-way pipe connector. The first heating return water pipe is also connected to the second hot water outlet connector and the second heating return water pipe. The second heating return water pipe is connected to the hot water outlet connector.

[0011] The domestic water pipeline control system includes an outlet valve, which includes a domestic cold water inlet connector and a heating return water connector. The domestic cold water inlet connector is connected to a cold water outlet pipe through a flow sensor inside the outlet valve, and the cold water outlet pipe is connected to the domestic water inlet connector. The domestic cold water inlet connector is connected to the heating return water connector through a water supply valve, and the heating return water connector is connected to a second hot water inlet connector through a connecting pipe.

[0012] The coupling tank is provided with connecting plates on both sides, and a water tank interface and an exhaust valve port are provided on the top of the coupling tank.

[0013] The flow sensor includes a first rotor and a second rotor connected to each other. One end of the first rotor drives the second rotor to rotate via an impeller. The top of the second rotor is provided with a connecting post, and a magnet and a retaining ring are connected to the outer periphery of the connecting post.

[0014] The first rotor and the second rotor are installed inside the flow connector. The flow connector is connected to the filter screen through a compression cap. The outer periphery of the flow connector is sealed to the inner wall of the outlet valve through the first sealing ring and the second sealing ring, respectively.

[0015] As can be seen from the above, the water circuit control device for a wall-hung boiler with a small temperature difference provided in this application buffers the water flow impact and balances temperature fluctuations through the two coupling processes of the coupling tank. Combined with the optimized design of the flow sensor, it improves sealing performance and measurement accuracy. It has the advantages of effectively isolating the direct impact of load-side flow fluctuations on the heat source side, stabilizing the outlet water temperature, and improving system stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of a water circuit control device for a wall-hung boiler with a small temperature difference according to the present invention;

[0018] Figure 2 This is a schematic diagram of the main structure of a water circuit control device for a wall-hung boiler with a small temperature difference according to this utility model;

[0019] Figure 3 This is a rear view structural diagram of a water circuit control device for a wall-hung boiler with a small temperature difference according to this utility model.

[0020] Figure 4 This is a three-dimensional structural diagram of the coupling tank in this utility model;

[0021] Figure 5 This is a schematic diagram of the installation structure of a water circuit control device for a wall-hung boiler with a small temperature difference according to this utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of the heat exchange plate in this utility model;

[0023] Figure 7 This is a three-dimensional structural diagram of the flow sensor in this utility model. Detailed Implementation

[0024] The following will refer to the appendix to this application. Figure 1-7The technical solutions in this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] In existing technologies, wall-hung boiler water systems typically couple the heat source to the load-side piping via a direct connection. When the system is connected to underfloor heating or has multiple water usage points, load-side flow fluctuations are directly transmitted to the heat source side, leading to unstable combustion and fluctuating outlet water temperature. In traditional solutions, heating return water enters the water heater directly, which can easily cause sudden changes in return water temperature when switching water usage points, resulting in frequent equipment start-ups and shutdowns and affecting heat exchange efficiency.

[0026] To address the aforementioned issues, a structure capable of buffering hydraulic fluctuations on the load side is needed. Considering the significant thermal inertia of underfloor heating systems, the inventors discovered that establishing an intermediate buffer can isolate the impact of load changes on the heat source. Through numerous experimental verifications, a two-stage thermal coupling method has been found to effectively balance the hydraulic demands of different load types while maintaining stable flow on the heat source side.

[0027] Therefore, this application proposes a water circuit control device for a wall-hung boiler with a small temperature difference, including a domestic water pipeline control system and a heating water pipeline control system that switch between the inlet valve 22 and the heating water pipeline control system. The heating water pipeline control system includes an inlet valve 22 connected to a hot water inlet connector 25. The inlet valve 22 is connected to a coupling tank 3 through a first hot water inlet connector 31. The hot water is coupled once in the coupling tank 3. The first hot water outlet connector 32 of the coupling tank 3 is connected to one end of the heating pipeline 50. The other end of the heating pipeline 50 is connected to a heating return water connector 14. The heating return water connector 14 is connected to the second hot water inlet connector 33 of the coupling tank 3. The hot water that completes the heating is coupled twice in the coupling tank. The second hot water outlet connector 34 of the coupling tank is connected to a heating return water pump 19.

[0028] The coupling tank refers to a container device with multiple fluid channels, which can be implemented using a compartmentalized structure. Its internal space allows for heat exchange between fluids at different temperatures. This device forms two independent heat exchange processes in the heating water circulation, effectively buffering the impact of load-side temperature fluctuations on the heat source.

[0029] The first hot water inlet connector refers to the connection port set at the water inlet end of the coupling tank. Specifically, it can be a threaded interface used to receive hot water from the inlet valve.

[0030] The second hot water inlet connector refers to the connection port located at the return water end of the coupling tank. Specifically, it can adopt a structure symmetrically arranged with the first inlet connector to receive the return water after the heating cycle is completed. This design ensures that the return water and fresh hot water form convective heat exchange within the tank.

[0031] Specifically, after hot water enters the coupling tank through the inlet valve, it undergoes an initial mixing with low-temperature return water within the tank. The mixed hot water is then transported to the heating pipeline through the first hot water outlet connector, where it releases heat and becomes low-temperature return water. This low-temperature return water returns to the coupling tank through the heating return water connector, where it mixes again with fresh hot water to form a secondary thermal coupling. This circulation mode keeps the flow rate on the heat source side stable, avoiding sudden changes in flow rate due to load variations.

[0032] Compared to existing technologies, traditional solutions involve the heating return water directly entering the water heater's heat exchanger, which can easily cause combustion system lag when the return water temperature changes abruptly. This solution establishes a buffer zone through a coupling tank, effectively absorbing return water temperature fluctuations through two thermal coupling processes. This reduces the amplitude of return water temperature changes entering the water heater, significantly improving system thermal stability.

[0033] Through the above technical solution, this application can effectively isolate the hydraulic interference between the underfloor heating system and the domestic water system, maintaining stable flow on the heat source side when multiple water points are turned on simultaneously. The dual thermal coupling design of the coupling tank reduces the fluctuation range of the return water temperature, lowers the adjustment frequency of the water heater combustion system, extends the service life of the equipment, and improves the user's heating comfort.

[0034] This application further proposes that the inlet valve 22 includes a three-way valve 2 controlled by a motor 10. The three-way valve 2 switches the hot water flow to the first hot water inlet connector 31 or to the hot water exchange inlet connector 43. The hot water exchange inlet connector 43 is located on the heat exchange plate 4. The hot water exchange inlet connector 43 of the heat exchange plate 4 is connected to the hot water exchange outlet connector 42. The heat exchange plate 4 is also provided with a domestic water inlet connector 41 and a domestic water outlet connector 44 that are connected to each other. The domestic water outlet connector 44 is connected to the domestic hot water outlet pipe 8 through a conversion connector 21. The domestic hot water outlet pipe 8 is connected to the domestic hot water outlet connector 12. A connecting connector 24 is provided between the inlet valve 22 and the first hot water inlet connector 31.

[0035] Among them, a three-way valve refers to a valve that changes the water flow path by driving a valve core with a motor. Specifically, it can be implemented using a stepper motor in conjunction with a rotary valve core structure, used to direct hot water flow to the heating system or domestic water heat exchange system as needed. A heat exchange plate refers to a plate-type heat exchange assembly with independent flow channels. Specifically, it can be implemented by stacking stainless steel plates to form parallel flow channels, allowing heating water and domestic water to exchange heat through adjacent flow channels. A conversion joint refers to a transitional connector that connects different pipe diameters or interface types. Specifically, it can be implemented using a copper reducing joint with a threaded sealing structure, used to ensure the sealing between the domestic water outlet and the pipeline.

[0036] Specifically, when domestic hot water demand is activated, the three-way valve, driven by a motor, switches the hot water flow to the hot water inlet. The hot water enters the heat exchange plate and transfers heat to the domestic water through the plate channels. The heated domestic water is then transported to the point of use via a conversion connector. When the heating system requires heating, the three-way valve switches the hot water to the first hot water inlet, allowing the hot water to directly enter the coupling tank and participate in the circulation. The domestic water inlet and heating water within the heat exchange plate form independent flow channels. The two water flows exchange heat through metal plates but are physically isolated, so fluctuations in the heating water flow rate do not directly affect the domestic water supply pressure.

[0037] Compared to existing technologies, traditional solutions share a single pipeline for domestic water and heating water, which can easily cause sudden changes in flow rate when the point of use changes. This solution, through a combination of a three-way valve and a heat exchange plate, completely separates the two water paths in terms of physical space and function. Heating water only transfers heat without mixing when flowing through the heat exchange plate, while domestic water obtains heat energy through an independent flow channel, thus structurally eliminating flow interference between different loads.

[0038] Through the above technical solution, this application can maintain the independent operation of the heating system's water flow path when the user turns on domestic water, avoiding drastic fluctuations in the heating return water temperature due to changes in domestic water flow. When only heating is needed, hot water directly enters the coupling tank for circulation, reducing pressure loss caused by flowing through the heat exchange plate and improving system energy efficiency. The water flow direction switching is smooth during the transition between the two operating conditions, and the temperature stability of both domestic water and heating water is effectively guaranteed.

[0039] This application further proposes that a heating water supply pump 18 and a heating water outlet connector 11 are provided between the first hot water outlet connector 32 and the heating pipe 50.

[0040] The heating water supply pump refers to the mechanical device used to drive the circulation of heating water. It can be a centrifugal pump or a gear pump. The water flow and pressure can be controlled by adjusting the pump speed or power, ensuring a stable water flow under dynamic load. The heating water outlet connector is the interface component connecting the heating pipes to the outlet of the coupling tank. It can be a threaded connector or flange connector with a sealing structure, used to ensure a reliable connection between the pipes and prevent water pressure loss or leakage due to loose connections.

[0041] Specifically, the heating water supply pump is installed between the first hot water outlet joint of the coupling tank and the heating pipe. When hot water flows out of the coupling tank, the pump actively drives the water flow into the heating pipe. By adjusting the pump's output power, the flow rate can be matched to the different heating areas. The heating water outlet joint serves as a pipe connection node, fixing the pump outlet to the heating pipe to form a closed circulation channel. During the operation of the heating system, the pump continuously provides power to compensate for pipe resistance, maintaining stable water pressure and avoiding uneven flow distribution caused by differences in the length of the underfloor heating coils or sudden changes in local resistance.

[0042] Compared to existing technologies, traditional heating systems rely on natural circulation or a single pump, making it difficult to cope with dynamic load changes and prone to abnormal return water temperatures due to flow fluctuations. This application addresses this by adding a heating water supply pump to achieve active flow regulation, combined with a dedicated outlet connector to ensure connection reliability, significantly improving the system's ability to suppress hydraulic fluctuations.

[0043] Through the above technical solution, this application can stabilize the water flow velocity and pressure in the heating pipeline, reduce sudden changes in flow caused by the opening and closing of other water points, and thus avoid drastic fluctuations in the underfloor heating water temperature. At the same time, the active control of the water pump can reduce the frequent start-up and shutdown of the wall-hung boiler due to abnormal return water temperature, extend the service life of the equipment, and improve the temperature uniformity of the heating area.

[0044] This application further proposes that the heating return water pump 19 is connected to the first heating return water pipe 5 through a three-way pipe connector 16. The first heating return water pipe 5 is simultaneously connected to the second hot water outlet connector 34 and the second heating return water pipe 6. The second heating return water pipe 6 is connected to the hot water outlet connector 42. The domestic water pipeline control system includes an outlet valve 15, which includes a domestic cold water inlet connector 13 and a heating return water connector 14. The domestic cold water inlet connector 13 is connected to the cold water outlet pipe 7 through a flow sensor inside the outlet valve 15. The cold water outlet pipe 7 is connected to the domestic water inlet connector 41. The domestic cold water inlet connector 13 is connected to the heating return water connector 14 through a water supply valve 9. The heating return water connector 14 is connected to the second hot water inlet connector 33 through a connecting pipe 17.

[0045] The components include: a domestic cold water inlet connector (which is the interface for introducing external cold water pipes, typically a threaded copper pipe connector), and a flow sensor (which detects water flow, typically a Hall effect sensor with a built-in rotor, converting impeller speed into an electrical signal for real-time feedback on water flow to regulate system pressure balance), a makeup water valve (connecting the cold water pipe to the heating return pipe, typically a solenoid valve or mechanical check valve, automatically adding cold water when heating system pressure is insufficient to maintain stable pressure), and a connecting pipe (connecting the heating return connector to the coupling tank's second hot water inlet connector, typically a high-temperature resistant corrugated metal hose, reintroducing the heating return water into the coupling tank for secondary heating and circulation).

[0046] Specifically, domestic chilled water enters the outlet valve through the domestic chilled water inlet connector. After the flow sensor detects flow changes, the water is then transported through the chilled water outlet pipe to the domestic water inlet connector of the heat exchange plate. When the return water pressure drops due to load changes in the heating system, the water supply valve opens, allowing domestic chilled water to directly replenish the heating return water connector. The return water is then guided through a connecting pipe to the second hot water inlet connector of the coupling tank. This design allows domestic chilled water to serve as both an independent source of domestic hot water and a pressure-compensating medium in the heating cycle, preventing system pressure fluctuations caused by insufficient heating return water.

[0047] Compared to existing technologies, traditional solutions completely isolate the domestic cold water pipes from the heating return water pipes, which can easily lead to unstable combustion of the water heater when the flow rate of the heating system changes abruptly. This solution establishes a dynamic connection between the two pipes through a water supply valve, maintaining an independent supply of domestic water while using a cold water replenishment mechanism to balance the pressure of the heating system, effectively suppressing the impact of sudden changes in return water temperature on the wall-hung boiler.

[0048] Through the above technical solution, this application realizes the coordinated pressure control of domestic water and heating systems. When multiple water points are turned on at the same time or the underfloor heating load changes, the return water flow is automatically adjusted through the water supply valve to reduce the start-stop frequency of the water heater caused by the return water temperature fluctuation, ensure the stability of the outlet water temperature, and extend the service life of the equipment.

[0049] This application further proposes that the coupling tank 3 is provided with connecting plates 30 on both sides, and the top of the coupling tank 3 is provided with a water tank interface 35 and an exhaust valve port 36 to improve the safety of the equipment.

[0050] The connecting plates refer to the metal fixing components located on both sides of the coupling tank. They can be implemented using welding or bolting of metal plates with mounting holes, and are used to fix the coupling tank to the equipment bracket or wall, enhancing structural stability. The water tank interface refers to the tubular connection port located at the top of the coupling tank, which can be implemented using a flange or threaded interface. It is used to connect to an external expansion tank or water replenishment device to balance system pressure fluctuations.

[0051] Compared to existing technologies, traditional coupling tanks typically employ bottom or sidewall outlet designs, which are prone to localized heat accumulation due to conflicts between water flow direction and heat convection direction, and lack a fixed structure, resulting in insufficient installation stability. This solution optimizes the water flow path through the combined effect of a top outlet and gravity, while achieving rigid fixation through connecting plates, thus resolving the issues of chaotic water flow direction and equipment vibration.

[0052] Through the above technical solution, this application achieves a stable connection between the coupling tank and external equipment, reducing mechanical vibration noise caused by water flow impact; through the synergistic effect of the top outlet and the water tank interface, it reduces temperature fluctuations caused by pressure fluctuations and heat accumulation, improves the temperature stability of the heating system under load changes, and avoids frequent start-ups and shutdowns of the wall-hung boiler caused by sudden changes in return water temperature.

[0053] This application further proposes a flow sensor including a first rotor 58 and a second rotor 54 connected to each other. One end of the first rotor 58 drives the second rotor 54 to rotate through an impeller. The top of the second rotor is provided with a connecting post, and a magnet 59 and a retaining ring 53 are connected to the outer periphery of the connecting post.

[0054] The first rotor drives the second rotor to rotate via an impeller, utilizing the kinetic energy generated by fluid flow to transmit mechanical motion. This can be achieved using a coaxial nested gear or coupling structure. The impeller converts the water flow energy into rotational power, ensuring the synchronous rotation of the two rotors. The connecting column's outer periphery connects to a magnet and a retaining ring, fixing the magnet to the connecting column surface using a retaining ring. This can be achieved using an annular groove and elastic snap-fit ​​structure. The magnet, in conjunction with an external sensing element, generates a flow signal, while the retaining ring restricts the magnet's axial displacement. The flow connector connects to a filter screen via a pressure cap, fixing the filter screen to the inlet of the flow connector using threads or a snap-fit ​​structure. This can be achieved using a combination of a stainless steel filter screen and a plastic pressure cap, intercepting impurities and preventing rotor jamming. The first and second sealing rings seal the inner wall of the outlet valve by filling the gap with annular rubber or silicone seals. This can be achieved using O-rings or irregularly shaped sealing rings, preventing water leakage from the connection between the flow connector and the valve body through a double-seal structure.

[0055] Specifically, when water enters the flow connector, the filter screen first intercepts particulate matter. Then, the water flow drives the first rotor to rotate, which in turn drives the second rotor to rotate synchronously via an impeller. The magnet at the top of the second rotor rotates with the connecting column, generating a periodic magnetic field change. An external sensor detects the frequency of this magnetic field change and calculates the flow rate data. A clamping cap presses the filter screen firmly against the flow connector inlet, preventing it from falling off or shifting. The first and second sealing rings are installed at the front and rear positions on the outer wall of the flow connector, respectively. Through elastic deformation, they fill the gap between the connector and the inner wall of the valve body, forming a double leak-proof barrier.

[0056] Compared to existing technologies, traditional flow sensors typically employ a single rotor structure with the magnet directly fixed to the shaft. This makes them prone to signal detection deviations due to axial displacement, and their simple sealing structure makes them susceptible to leakage after prolonged use. This solution reduces the load on a single rotor through a dual-rotor linkage design, uses retaining rings to fix the magnet's position to prevent signal drift, and employs a double-sealing ring structure to improve leak-proof reliability. Furthermore, the combination of a filter and a compression cap effectively prevents impurities from entering the sensor.

[0057] Through the above technical solution, this application solves the problem of signal instability caused by magnet displacement in traditional flow sensors, reduces the risk of impurities jamming the rotor, and reduces the probability of leakage through the double sealing design, extends the service life of the sensor, and ensures the accuracy of flow detection in the outlet valve and the stability of system operation.

[0058] This application further proposes that the first rotor and the second rotor are installed in the flow connector 52, the flow connector 52 is connected to the filter screen 56 through the compression cap 57, and the outer periphery of the flow connector is sealed to the inner wall of the outlet valve 15 through the first sealing ring 51 and the second sealing ring 55 respectively.

[0059] Specifically, the first and second sealing rings are located at the front and rear positions on the outer wall of the flow connector, respectively, and fit tightly against the inner wall of the outlet valve, forming a double-sealing structure. When water flows through the filter screen, impurities are intercepted, and the clean water flow drives the first rotor to rotate. The first rotor drives the second rotor to rotate synchronously through an impeller. The magnet at the top of the second rotor generates a periodic magnetic field change with rotation, and an external sensor calculates the water flow rate by detecting the frequency of the magnetic field change. The threaded connection between the pressure cap and the flow connector ensures that the filter screen remains stable under high-pressure water flow, while the sealing rings effectively prevent water from seeping out from the gap between the flow connector and the outlet valve.

[0060] Compared to existing technologies, traditional flow sensors typically have rotor assemblies directly exposed in the pipe, lacking filtration protection and susceptible to metering errors due to impurities. Their simple sealing structure also makes them prone to leakage due to wear after prolonged use. This solution integrates a filter and dual sealing rings, extending the sensor's lifespan while ensuring flow detection accuracy and reducing maintenance costs.

[0061] Through the above technical solution, this application can effectively prevent impurities in the water from entering the flow sensor, avoid rotor jamming or wear, and ensure the accuracy and stability of flow detection; the double sealing structure reduces the risk of leakage, improves the overall sealing performance of the water system, thereby reducing temperature control errors caused by flow fluctuations and improving user experience.

[0062] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A water circuit control device for a wall-hung boiler with a small temperature difference, comprising a domestic water pipeline control system and a heating water pipeline control system for switching the inlet valve (22), characterized in that: The heating water pipeline control system includes an inlet valve (22) connected to a hot water inlet connector (25). The inlet valve (22) is connected to a coupling tank (3) through a first hot water inlet connector (31). The hot water is coupled once in the coupling tank (3). The first hot water outlet connector (32) of the coupling tank (3) is connected to one end of the heating pipeline (50). The other end of the heating pipeline (50) is connected to the heating return water connector (14). The heating return water connector (14) is connected to the second hot water inlet connector (33) of the coupling tank (3). The hot water that completes the heating is coupled twice in the coupling tank. The second hot water outlet connector (34) of the coupling tank is connected to the heating return water pump (19).

2. The water circuit control device for a wall-hung boiler with a small temperature difference according to claim 1, characterized in that: The inlet valve (22) includes a three-way valve (2) controlled by a motor (10). The three-way valve (2) switches the hot water flow to the first hot water inlet connector (31) or to the hot water exchange inlet connector (43). The hot water exchange inlet connector (43) is located on the heat exchange plate (4). The hot water exchange inlet connector (43) of the heat exchange plate (4) is connected to the hot water exchange outlet connector (42). The heat exchange plate (4) is also provided with a domestic water inlet connector (41) and a domestic water outlet connector (44) that are connected to each other. The domestic water outlet connector (44) is connected to the domestic hot water outlet pipe (8) through a conversion connector (21). The domestic hot water outlet pipe (8) is connected to the domestic hot water outlet connector (12). A connecting connector (24) is provided between the inlet valve (22) and the first hot water inlet connector (31).

3. The water path control device for a wall-mounted boiler having a small temperature difference according to claim 1, characterized in that: A heating water supply pump (18) and a heating water outlet connector (11) are provided between the first hot water outlet connector (32) and the heating pipe (50).

4. The small-difference-temperature water path control device for a wall-mounted boiler according to claim 1, characterized in that: The heating return water pump (19) is connected to the first heating return water pipe (5) through the three-way pipe connector (16). The first heating return water pipe (5) is also connected to the second hot water outlet connector (34) and the second heating return water pipe (6). The second heating return water pipe (6) is connected to the hot water outlet connector (42).

5. The water path control device for a wall-mounted boiler having a small temperature difference according to claim 1, characterized in that: The domestic water pipeline control system includes an outlet valve (15), which includes a domestic cold water inlet connector (13) and a heating return water connector (14). The domestic cold water inlet connector (13) is connected to the cold water outlet pipe (7) through a flow sensor inside the outlet valve (15), and the cold water outlet pipe (7) is connected to the domestic water inlet connector (41). The domestic cold water inlet connector (13) is connected to the heating return water connector (14) through a water supply valve (9), and the heating return water connector (14) is connected to the second hot water inlet connector (33) through a connecting pipe (17).

6. The water path control device for a wall-mounted boiler having a small temperature difference according to claim 1, characterized by The coupling tank (3) is provided with connecting plates (30) on both sides, and the top of the coupling tank (3) is provided with a water tank interface (35) and an exhaust valve port (36).

7. The water path control device for a wall-mounted boiler having a small temperature difference according to claim 5, characterized in that, The flow sensor includes a first rotor (58) and a second rotor (54) connected to each other. One end of the first rotor (58) drives the second rotor (54) to rotate via an impeller. The top of the second rotor is provided with a connecting post, and a magnet (59) and a retaining ring (53) are connected to the outer periphery of the connecting post.

8. The water path control device for a wall-mounted boiler having a small temperature difference according to claim 7, characterized by The first rotor and the second rotor are installed in a flow joint (52), the flow joint (52) is connected with a filter screen (56) through a pressing cap (57), and the flow joint is in sealed connection with the inner wall of the water outlet valve (15) through the first sealing ring (51) and the second sealing ring (55) respectively.

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