A domestic water and floor heating water control system suitable for a central heating system

Abstract

This utility model discloses a control system for domestic water and underfloor heating water suitable for centralized heating systems. It includes a centralized heating water system, an underfloor heating water system, and a domestic water system. The hot water from the centralized heating water system directly provides hot water to the underfloor heating water system and heat-exchange hot water to the domestic water system through the control system. The system converts cold domestic water into hot domestic water through a heat exchanger. Based on the hot water from the centralized heating water system, this utility model simultaneously provides a safe and reliable heat source for both the underfloor heating and domestic water systems within a building through the control system, improving energy efficiency and making the entire water heating system more convenient and environmentally friendly.

Description

Technical Field

[0001] This utility model relates to the field of pipeline control technology for centralized heating, and in particular to a domestic water and underfloor heating water control system suitable for centralized heating systems. Background Technology

[0002] In existing heating systems, centralized heating systems are typically used only for underfloor heating, a single-purpose design with significant functional limitations. As users' demands for quality of life increase, they require not only stable underfloor heating in winter but also a continuous supply of domestic hot water. Traditional centralized heating systems, due to their single-circuit design, cannot achieve intelligent switching and sharing between domestic hot water and heating water, resulting in limited system functionality and low energy efficiency. Specifically, when users need domestic hot water, the underfloor heating system must stop operating, and vice versa, causing inconvenience and energy waste. Furthermore, existing systems lack effective flow control and filtration devices, leading to water temperature fluctuations and water pollution during switching, affecting user comfort and system stability. More seriously, traditional systems cannot achieve effective heat exchange between domestic cold water and heating hot water, resulting in a large amount of heat energy being unused and directly returned, causing energy waste. These problems severely restrict the overall performance and user experience of centralized heating systems. Therefore, existing technologies urgently need improvement to address these issues. Utility Model Content

[0003] The purpose of this utility model is to provide a domestic water and underfloor heating water control system suitable for centralized heating systems, which can realize intelligent switching and sharing of domestic hot water and underfloor heating, improve energy utilization, and avoid the shortcomings of single system function.

[0004] This application provides a domestic water and underfloor heating water control system suitable for centralized heating systems. The system includes a centralized heating water system, an underfloor heating water system, and a domestic water system. Hot water from the centralized heating water system is directly supplied to the underfloor heating water system and also provides heat exchange hot water to the domestic water system via the control system. Domestic cold water from the domestic water system is converted into domestic hot water through a heat exchanger with the centralized heating hot water. The control system includes a first three-way switching valve and a second three-way switching valve. The second three-way switching valve controls the flow rate of hot water from the centralized heating water system to the underfloor heating water system and the flow rate of heat exchange hot water supplied to the domestic water system. The first three-way switching valve controls whether the hot water from the centralized heating water system provides heat exchange hot water to the domestic water system. This domestic water and underfloor heating water control system, based on the hot water from the centralized heating water system, simultaneously provides a safe and reliable heat source to both the underfloor heating water system and the domestic water system within the building, improving energy efficiency and making the entire water heating system more convenient and environmentally friendly.

[0005] The central heating water system includes a central heating inlet pipe, which is connected to the first interface of a three-way connector via a second three-way switching valve. The three-way connector also includes a second interface and a third interface. The second interface is connected to the underfloor heating water supply pipe, and the hot water in the underfloor heating water supply pipe flows back to the central heating inlet pipe after passing through the underfloor heating pipe. The third interface is connected to the hot water inlet connector of the heat exchange plate, and the hot water inlet connector is connected to the hot water outlet connector. The hot water outlet connector is connected to one end of the hot water outlet pipe, and the other end of the hot water outlet pipe is connected to the central heating return pipe via the first three-way switching valve. The central heating return pipe is connected to the central heating inlet pipe.

[0006] The heat exchange plate is equipped with a domestic water inlet connector and a domestic water outlet connector that are interconnected. The domestic water inlet connector is connected to one end of the domestic water inlet pipe, and the other end of the domestic water inlet pipe is connected to the second filter. The domestic water outlet connector is connected to the domestic hot water outlet pipe.

[0007] The first three-way switching valve and the second three-way switching valve both include a first straight pipe section and a second straight pipe section with an integral structure. One end of the second straight pipe section is provided with an inlet, and the other end is connected to the pipe wall of the first straight pipe section. One end of the first straight pipe section is provided with an outlet, and the other end is connected to a motor. A valve port is provided inside the first straight pipe section, and the motor is provided with a rotating spindle.

[0008] The motor is a permanent magnet motor. The outer circumference of the rotating spindle is threaded, and the outer circumference of the threaded spindle is fitted with a nut that is fixedly connected to the inner wall of the first straight pipe section. During the rotation driven by the motor, the rotating spindle moves back and forth along the axial direction of the nut to control the opening and closing of the valve port.

[0009] The nut is a tubular structure. The outer wall of the tubular structure is sealed to the inner wall of the first straight pipe section through a positioning ring and a first sealing ring. The inner wall of the tubular structure is sealed to the outer wall of the rotating spindle through parallel second and third sealing rings.

[0010] The first straight pipe section is provided with a flange at one end connected to the motor. The flange is connected to one side of the mounting plate by positioning screws, and the other side of the mounting plate is connected to the motor.

[0011] A first filter is provided between the central heating return water pipe and the underfloor heating pipe. The first filter includes a third straight pipe section and an inclined pipe with an integral structure. Both ends of the third straight pipe section are connected to movable joints. The outer side of the middle pipe wall is connected to the inclined pipe. An inclined wall is provided on the inner side of the inclined pipe. One end of the inclined wall is integrally formed with the third straight pipe section. One side of the inclined wall cooperates with the third straight pipe section to form a second flow channel inclined downward. After the second flow channel turns inside the inclined pipe, it cooperates with the other side of the inclined wall to form a third flow channel inclined upward. A filter ring is provided inside the inclined pipe between the second flow channel and the third flow channel. One end of the filter ring is connected to the inclined wall, and the other end is connected to the end cap of the plug. The inner wall of the plug is sealed to the inclined pipe by a fourth sealing ring.

[0012] The second flow channel is connected to the first flow channel located in the water inlet direction of the third straight pipe section, and the third flow channel is connected to the fourth flow channel located in the water outlet direction of the third straight pipe section. An arc-shaped connecting channel is provided between the third flow channel and the fourth flow channel, and the arc-shaped connecting channel is located at the junction of the third straight pipe section and the inclined pipe. The movable joint is connected to the movable nut. The outer wall of the third straight pipe section is provided with a pressure sensor interface and a temperature sensor interface respectively.

[0013] The outlet end of the second filter is equipped with a water flow sensor.

[0014] As can be seen from the above, the domestic water and underfloor heating water control system provided in this application is suitable for centralized heating systems. It controls the supply of centralized heating hot water to the underfloor heating system and the domestic water heat exchange system respectively through a three-way switching valve, so as to realize the parallel operation of the two functions. It has the advantages of realizing intelligent switching and sharing of domestic hot water and underfloor heating, improving energy utilization, and avoiding the single function of the system. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a three-dimensional structural diagram of a domestic water and underfloor heating water control system suitable for centralized heating systems according to this utility model;

[0017] Figure 2 This is a schematic diagram of the main structure of a domestic water and underfloor heating water control system suitable for a centralized heating system according to this utility model;

[0018] Figure 3 This is a bottom view schematic diagram of a domestic water and underfloor heating water control system suitable for centralized heating systems according to this utility model;

[0019] Figure 4 This is a three-dimensional structural diagram of the first three-way switching valve in this utility model;

[0020] Figure 5 This is a bottom view of the structure of the first three-way switching valve in this utility model;

[0021] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure at point AA;

[0022] Figure 7 This is a three-dimensional structural diagram of the first filter in this utility model;

[0023] Figure 8This is a schematic diagram of the main structure of the first filter in this utility model;

[0024] Figure 9 for Figure 8 Cross-sectional view at section BB and schematic diagram of water flow channel structure;

[0025] Figure 10 This is a schematic diagram of the left-side structure of the first filter in this utility model;

[0026] Figure 11 for Figure 10 Schematic diagram of the cross-sectional structure at the CC section. Detailed Implementation

[0027] The following will refer to the appendix to this application. Figure 1-11 The 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.

[0028] In existing technologies, centralized heating systems typically only have a single water channel for underfloor heating, which cannot simultaneously meet the differentiated needs of domestic hot water and heating water. In winter, users need both underfloor heating to maintain indoor temperature and a stable supply of domestic hot water, but traditional systems, limited by their single water channel structure, cannot dynamically switch between the two water supply modes, resulting in low equipment utilization and limited functionality.

[0029] To address the aforementioned issues, a system capable of sharing a heat source while independently controlling the flow rates of different water circuits needs to be designed. Analysis revealed that the temperature of the centralized heating hot water is sufficient to support both application scenarios; the key lies in establishing a flow-diversion control mechanism. Based on this, a switching valve is considered to be installed on the main pipeline to direct hot water to the underfloor heating circuit and the heat exchanger, while simultaneously using the heat exchanger to convert domestic cold water into hot water.

[0030] Therefore, this application proposes a control system for domestic water and underfloor heating water suitable for centralized heating systems, characterized in that: it includes a centralized heating water system, an underfloor heating water system, and a domestic water system; the hot water from the centralized heating water system directly provides hot water to the underfloor heating water system and provides heat exchange hot water to the domestic water system through the control system; the domestic cold water from the domestic water system is converted into domestic hot water through heat exchange with the centralized heating hot water via a heat exchanger; the control system includes a first three-way switching valve 1 and a second three-way switching valve 2;

[0031] The second three-way switching valve 2 controls the flow of hot water from the centralized heating water system to the underfloor heating water system and the flow rate of hot water for heat exchange to the domestic water system;

[0032] The first three-way switching valve 1 controls whether the hot water in the centralized heating water system provides heat exchange hot water to the domestic water pipe system.

[0033] The control scheme for the above-mentioned centralized heating water system, underfloor heating water system and domestic water system is as follows: the centralized heating hot water is directly supplied to the underfloor heating system through two three-way switching valves, and a heat exchange source is provided to the domestic water system. The domestic cold water is converted into domestic hot water after heat exchange with the heating hot water through a heat exchanger.

[0034] The centralized heating water system refers to the main water supply loop connected to an external heat source. It can be constructed using galvanized steel pipes or high-temperature resistant plastic pipes and is typically part of the city's heating network for transporting high-temperature hot water. The underfloor heating water system refers to a circulation loop embedded in the building structure. It can use a combination of manifolds and coils for indoor heating. The domestic water system refers to an independent pipeline supplying domestic water. It can be made of copper or PPR and connects to water-using equipment at the end. The first three-way switching valve is a flow distribution device with three ports. It can be an electric ball valve or a rotary valve core structure and is used to control whether heating hot water enters the heat exchanger. The second three-way switching valve is another flow regulation device, which can use valves of the same structure and is used to distribute the flow ratio of heating hot water between the underfloor heating loop and the heat exchanger.

[0035] Specifically, after the central heating hot water enters the system, the second three-way switching valve adjusts the flow direction according to demand: some hot water directly enters the underfloor heating circuit to maintain heating, and the remainder flows into the heat exchanger. Domestic cold water enters the heat exchanger from the inlet end, undergoes non-contact heat exchange with the heating hot water, and is then heated and converted into domestic hot water output. The first three-way switching valve controls whether the heated hot water returns to the central heating return pipe according to the domestic hot water demand. When the domestic hot water demand is low, the first three-way valve can close the heat exchanger branch, allowing all the heating hot water to be used for underfloor heating circulation; when both types of hot water need to be supplied simultaneously, the two valves work together to adjust the flow ratio to ensure a reasonable distribution of heat source.

[0036] Compared to existing technologies, traditional systems control hot water flow using only a single valve, making it impossible to supply both underfloor heating and domestic hot water simultaneously. This solution employs two independent three-way valves to regulate different branches, allowing heating hot water to be distributed to the underfloor heating circuit and heat exchanger as needed, generating domestic hot water while maintaining underfloor heating functionality. Furthermore, the integrated design of the heat exchanger and heating circuit avoids the introduction of additional heating equipment, simplifying the system structure.

[0037] Through the above technical solutions, this application achieves multi-purpose utilization of hot water for centralized heating, enabling dynamic adjustment of the hot water distribution ratio according to actual needs and solving the problem of single-function traditional systems. Underfloor heating and domestic hot water supply can operate independently or in tandem, improving system flexibility. The heat exchanger eliminates the need for additional energy consumption in domestic hot water preparation, improving heat source utilization efficiency. The interlocking control mechanism of two three-way valves ensures stable system operation under different operating conditions, reducing equipment redundancy.

[0038] This application further proposes a centralized heating water system including a centralized heating inlet pipe 45, which is connected to the first interface 7 of a three-way connector 5 via a second three-way switching valve 2. The three-way connector 5 also includes a second interface 8 and a third interface 9. The second interface 8 is connected to a floor heating water supply pipe 44, and the hot water in the floor heating water supply pipe 44 flows back to the centralized heating inlet pipe 45 after passing through the floor heating pipe. The third interface 9 is connected to a hot water inlet connector 40 of a heat exchange plate 4, which is connected to a hot water outlet connector 42. The hot water outlet connector 42 is connected to one end of a hot water outlet pipe 48, and the other end of the hot water outlet pipe 48 is connected to a centralized heating return pipe 49 via a first three-way switching valve 1. The centralized heating return pipe 49 is connected to the centralized heating inlet pipe 45.

[0039] A tee fitting is a pipe fitting with three fluid channels, typically made from a T-shaped copper alloy casting. The first port receives heating water, the second connects to the underfloor heating system, and the third connects to the heat exchange system. A heat exchange plate is a device used for heat exchange between two fluids, typically a plate heat exchanger structure. Its internal structure consists of multiple corrugated metal plates forming alternating flow channels, allowing non-contact heat transfer between heating hot water and domestic cold water through the plates.

[0040] Specifically, high-temperature hot water introduced from the central heating inlet pipe enters the tee joint via the second three-way switching valve, and is distributed to the underfloor heating supply pipe or heat exchange plate according to the valve opening. When the underfloor heating system needs heating, hot water enters the underfloor heating pipes for circulation through the second interface; when domestic hot water needs to be prepared, some hot water enters the heat exchange plate through the third interface to exchange heat with the cold water introduced from the domestic water inlet pipe. After heat exchange, the heating return water returns to the central heating return water pipe through the hot water outlet pipe and the first three-way switching valve, forming a complete heat circulation loop. This structure, through the diversion effect of the tee joint, realizes the dynamic distribution of heating water between the underfloor heating system and the domestic water heat exchange system.

[0041] Through the above technical solution, this application enables the heating system to simultaneously meet the dual needs of underfloor heating and domestic hot water preparation. The heating hot water, through a three-way connector for flow control, can be flexibly distributed to different functional modules according to actual needs, avoiding the space occupation and energy waste caused by the need for two independent heating devices in traditional systems. The direct connection between the heat exchange plate and the heating return water pipe ensures that the low-temperature return water after heat exchange can be returned to the centralized heating system in a timely manner, maintaining the stability of the entire thermal cycle.

[0042] As a preferred structural feature, the heat exchange plate 4 is provided with a domestic water inlet connector 41 and a domestic water outlet connector 43 that are interconnected. The domestic water inlet connector 41 is connected to one end of the domestic water inlet pipe 46, and the other end of the domestic water inlet pipe 46 is connected to the second filter 6. The domestic water outlet connector 43 is connected to the domestic hot water outlet pipe 47.

[0043] The second filter refers to an impurity filtration device installed at the inlet of the domestic water inlet pipe. Specifically, it can be implemented using a Y-type valve body structure with a built-in 50-100 mesh filter screen, used to intercept particulate matter in the domestic cold water to prevent it from entering the heat exchange plate flow channel. The domestic water inlet pipe and domestic hot water outlet pipe are independent water supply pipes separate from the heating system. They can be made of PPR material with a heat fusion connection method, forming a domestic water circulation channel physically isolated from the heating water circuit.

[0044] Specifically, after passing through the second filter and entering the domestic water inlet pipe, the domestic cold water is introduced into the internal flow channels of the heat exchange plate via the domestic water inlet connector. Within these channels, the domestic cold water flows separately from the hot water from the central heating system, but heat is conducted through metal plates. The domestic hot water, having completed heat exchange, is then discharged through the domestic water outlet connector to the domestic hot water outlet pipe for user use. The heating hot water and domestic water form a counter-flow path within the heat exchange plate to improve heat exchange efficiency. The domestic water channels and heating water channels are completely isolated by sealing strips.

[0045] Through the above technical solution, this application solves the problem of reduced heat exchange efficiency caused by impurity deposition during the heat exchange process of domestic cold water. At the same time, the independent filtration device and isolated flow channel design avoid the risk of cross-contamination between heating water and domestic water, and achieve a continuous and safe supply of domestic hot water while maintaining the stable operation of the heating system.

[0046] This application further proposes that both the first three-way switching valve 1 and the second three-way switching valve 2 include an integral first straight pipe section 11 and a second straight pipe section 12. One end of the second straight pipe section 12 is provided with a water inlet 10, and the other end is connected to the pipe wall of the first straight pipe section 11. One end of the first straight pipe section is provided with a water outlet 13, and the other end is connected to a motor 22. The first straight pipe section 11 is provided with a valve port 14 inside, and the motor 22 is provided with a rotating spindle 18.

[0047] The integrated structure of the first and second straight pipe sections refers to the two sections being formed as a whole through casting or welding, specifically using stainless steel or copper alloy materials. This structure reduces the risk of leakage at connection points and enhances the strength of the valve body. The inlet is located at one end of the second straight pipe section to introduce hot water for centralized heating, and can be implemented using a flange or threaded interface. Its location design optimizes the water flow direction. The outlet is located at one end of the first straight pipe section to discharge the switched water flow, and can be configured as a unidirectional outlet structure to prevent backflow. The motor is connected to the end of the first straight pipe section, and can be encased in a waterproof motor housing, used to drive the axial movement of the rotating spindle. The outer circumference of the rotating spindle has threads that mate with a nut on the inner wall of the first straight pipe section, specifically using a trapezoidal thread structure. The rotational motion is converted into linear displacement, thereby controlling the opening and closing of the valve port.

[0048] Specifically, when the motor drives the rotating spindle to rotate, the engagement of the thread and nut causes the spindle to move axially, driving the valve core formed by the spindle to open or close the valve port. For example, when it is necessary to block the water flow, the motor drives the spindle forward to completely close the valve port; when it is necessary to regulate the flow rate, the spindle partially opens the valve port to form a throttling channel. Because the first straight pipe section and the second straight pipe section adopt an integral molding structure, after the water flows in from the inlet, it can directly enter the valve cavity through the connection between the second straight pipe section and the first straight pipe section, reducing the risk of leakage caused by the connection gap in traditional split valve bodies.

[0049] Compared to existing technologies, traditional three-way valves often employ a combination of a separate valve body and an independent drive unit, resulting in complex assembly and poor sealing performance. This solution, however, utilizes an integrated pipe section structure and a built-in threaded transmission mechanism. This not only simplifies the valve body assembly process but also controls the valve port through axial linear motion, avoiding seal wear caused by the long-term rotation of the rotary valve core, thus improving control accuracy and service life.

[0050] Through the above technical solution, this application achieves a compact design for a three-way switching valve. While ensuring the water flow switching function, the integrated structure reduces the probability of leakage. The combination of threaded drive and axial displacement makes the valve opening control more linear and precise. For example, in the process of distributing the flow of domestic hot water and underfloor heating water, stepless adjustment can be achieved according to heating demand, avoiding temperature fluctuations caused by the step adjustment of traditional valves. In addition, this structure reduces the radial clearance of moving parts, effectively preventing energy loss caused by the mixing of hot and cold water.

[0051] This application further proposes that the motor 22 is a permanent magnet motor, the outer circumference of the rotating spindle 18 is threaded, and the outer circumference of the threaded spindle is fixedly connected to the nut 20 on the inner wall of the first straight pipe section 11. During the rotation driven by the motor 22, the rotating spindle 18 moves back and forth along the axial direction of the nut 20 to control the opening and closing of the valve port 14.

[0052] The permanent magnet motor refers to a drive device that uses permanent magnets to generate an excitation magnetic field. Specifically, the rotor can be made of rare-earth permanent magnet materials, and the main shaft rotation is achieved through electromagnetic induction. It features high torque density and fast response, providing stable driving force for valve control. The threaded engagement structure refers to a spiral protrusion machined on the outer surface of the rotating spindle, which meshes with the groove on the inner wall of the nut. This can be achieved using a trapezoidal thread or a ball screw structure. Rotational motion is converted into axial displacement, causing the spindle to produce linear motion under the motor's drive. Axial motion control of valve opening and closing refers to a sealing component at the end of the spindle. When the spindle moves forward, it contacts the edge of the valve port to form a sealing interface. This can be achieved using a conical valve core and an annular valve seat. The displacement adjusts the cross-sectional area of ​​the fluid channel, achieving precise flow control.

[0053] Through the above technical solution, this application achieves precise linear adjustment of valve opening, enabling rapid adjustment of the flow distribution ratio of domestic hot water and underfloor heating water according to the heating system requirements. The threaded drive structure avoids the lubrication and maintenance needs of traditional gearboxes, and the multi-layer design of the sealing components effectively extends the service life of the motor in high-temperature and high-humidity environments, thus enhancing system reliability.

[0054] This application further proposes that the nut 20 is a tubular structure, the outer wall of the tubular structure is sealed to the inner wall of the first straight pipe section 11 by a positioning ring 15 and a first sealing ring 16, and the inner wall of the tubular structure is sealed to the outer wall of the rotating main shaft 18 by parallel second sealing rings 23 and third sealing rings 24.

[0055] The tubular structure refers to a mechanical component with a hollow cylindrical shape, which can be made of metal or high-strength engineering plastics, or machined from metal, and is used to realize the transmission connection between the rotating spindle and the first straight pipe section. The positioning ring is an annular component fixed to the outer wall of the tubular structure, which can be installed using an interference fit or threaded connection, and is used to limit the axial displacement of the tubular structure within the first straight pipe section. The first sealing ring is an annular seal installed between the outer wall of the tubular structure and the inner wall of the first straight pipe section, which can be made of rubber or polytetrafluoroethylene, and is used to prevent fluid leakage from the gap between the tubular structure and the first straight pipe section. The parallel second and third sealing rings refer to two sets of sealing structures arranged sequentially along the axial direction of the rotating spindle, which can be a combination of sealing materials with different hardness, to achieve a double sealing effect under dynamic motion conditions, preventing fluid leakage along the outer wall of the rotating spindle.

[0056] Specifically, the outer wall of the nut in the tubular structure is fixedly connected to the inner wall of the first straight pipe section via a locating ring. The first sealing ring is compressed between the tubular structure and the first straight pipe section to eliminate radial clearance. Between the rotating spindle and the interior of the tubular structure, the second and third sealing rings are arranged side by side, each bearing pressure fluctuations in different directions. When the rotating spindle moves axially under the drive of the motor, the sealing rings compensate for the clearance changes caused by the movement through elastic deformation, thereby maintaining the integrity of the sealing interface.

[0057] Through the above technical solution, this application effectively solves the fluid leakage problem caused by seal failure during the switching process of traditional three-way valves, while reducing the maintenance frequency caused by component wear and improving the stability of the system in long-term operation.

[0058] This application further proposes that the first straight pipe section 11 is connected to a motor 22 with a flange 17 at one end. The flange 17 is connected to one side of the mounting plate 21 by a positioning screw 19, and the other side of the mounting plate 21 is connected to the motor 22.

[0059] The flange refers to the annular flange structure extending outward from the end of the first straight pipe section. It can be achieved using a stamping process to increase the contact area with the mounting plate, thereby improving connection strength. The positioning screw is a threaded fastener, typically made of stainless steel, which is screwed into pre-drilled holes on the mounting plate for axial positioning. The mounting plate is a metal plate that supports the motor and the straight pipe section. It can be made of aluminum alloy sheet and serves as a mechanical bridge connecting the motor and the piping system.

[0060] Specifically, during assembly, after the flange aligns with the mounting plate, it is tightened and secured using evenly distributed positioning screws. The other side of the mounting plate is rigidly connected to the motor housing via bolts or welding, forming a three-point support structure of motor-mounting plate-straight pipe section. This structure effectively disperses stress generated by pipeline vibration during operation, while maintaining the coaxiality of the rotating spindle and valve port.

[0061] Through the above technical solution, this application solves the problem of easy loosening of the connection structure between the electric valve motor and the pipeline, which leads to sealing failure. The combination design of the flange and the mounting plate enhances the compressive strength of the connection interface. The axial constraint function of the positioning screw can effectively prevent the loosening of the threads caused by high-frequency vibration. The overall structure significantly improves the convenience of equipment maintenance while ensuring sealing performance.

[0062] This application further proposes that a first filter 3 is provided between the central heating return water pipe 49 and the underfloor heating pipe. The first filter 3 includes a third straight pipe section 30 and an inclined pipe 31 with an integral structure. Both ends of the third straight pipe section 30 are connected to movable joints 35. The outer side of the middle pipe wall is connected to the inclined pipe 31. An inclined wall 38 is provided on the inner side of the inclined pipe 31. One end of the inclined wall 38 is integrally formed with the third straight pipe section 30. One side of the inclined wall 38 cooperates with the third straight pipe section 30 to form a downward inclined second flow channel 302. After the second flow channel 302 turns inside the inclined pipe 31, the other side of the inclined wall 38 cooperates with the inclined pipe 31 to form a third flow channel 303 with an upward inclined direction. A filter ring 32 is provided inside the inclined pipe 31 between the second flow channel 302 and the third flow channel 303. One end of the filter ring 32 is connected to the inclined wall 38, and the other end is connected to the end cap of the plug cap 33. The inner wall of the plug cap 33 is sealed to the inclined pipe 31 by a fourth sealing ring 37. Both ends of the third straight pipe section 30 are sealed to the movable joint 35 via the sixth sealing ring 36.

[0063] The filter ring refers to a ring-shaped filter component with a perforated structure, which can be made of stainless steel mesh or ceramic filter element, used to intercept impurities in the water. The inclined wall refers to a pipe wall structure that is inclined at an angle to the straight pipe section, which can be made of a metal plate with an inclination angle of 30-60 degrees, used to guide the water flow and create a changing flow path. The plug cap is a removable pipe end seal, which can be made of a metal cap with internal threads, facilitating the cleaning of impurities accumulated on the filter ring after opening.

[0064] Specifically, when water enters the first flow channel from the inlet direction of the third straight pipe section, it is guided by the inclined wall into the second flow channel, forming a downward-sloping flow direction. After turning at the bottom of the inclined pipe, the water flows through the third flow channel, forming an upward-sloping flow path, and finally enters the fourth flow channel through the arc-shaped connecting channel. During this process, impurities carried by the water flow are intercepted by the filter ring, and clean water continues to flow to the heating system. When maintenance is required, the filter ring can be removed by removing the cap for cleaning or replacement, and the fourth sealing ring ensures that no leakage occurs during disassembly. Pressure sensor and temperature sensor interfaces can be equipped with detection devices for real-time monitoring of the filter's operating status.

[0065] Compared to existing technologies, traditional filtration devices typically employ a straight-through filter structure, which suffers from easy clogging and inconvenient maintenance. This solution alters the water flow direction by incorporating an inclined flow channel, allowing impurities to settle more easily on the filter ring surface under gravity. Furthermore, the removable cap structure eliminates the need to disassemble the entire filter body for maintenance, significantly improving maintenance efficiency.

[0066] Through the above technical solutions, this application effectively solves the problem of pipe blockage caused by the accumulation of impurities in the heating system. The inclined flow channel design enhances the water flow's ability to carry impurities, the detachable plug structure enables rapid maintenance of the filter components, and the pressure and temperature monitoring interface provides hardware support for system status monitoring, thereby ensuring the long-term stable operation of the heating system.

[0067] This application further proposes that the second flow channel 302 is connected to the first flow channel 301 located in the water inlet direction of the third straight pipe section 30, and the third flow channel 303 is connected to the fourth flow channel 304 located in the water outlet direction of the third straight pipe section 30. An arc-shaped connecting channel 39 is provided between the third flow channel 303 and the fourth flow channel 304, and the arc-shaped connecting channel 39 is located at the junction of the third straight pipe section 30 and the inclined pipe 31. The movable joint 35 is connected to the movable nut 34. The outer wall of the third straight pipe section 30 is respectively provided with a pressure sensor interface 29 and a temperature sensor interface 28.

[0068] The arc-shaped connecting channel refers to the arc-shaped transition structure located at the connection between the third straight pipe section and the inclined pipe. This can be achieved using pipe bending or casting processes, and is used to eliminate sudden changes in water flow resistance caused by right-angle turns. The pressure sensor interface is a threaded hole located on the outer wall of the third straight pipe section, which can be used to install a piezoresistive sensor for real-time monitoring of water flow pressure changes. The temperature sensor interface is a mounting hole located alongside the pressure sensor, which can be used to mount a thermocouple probe for synchronously acquiring water flow temperature data.

[0069] Specifically, after the return water from the central heating system enters the third straight pipe section from the first flow channel, it flows downwards at an angle through the second flow channel, makes a 90-degree turn inside the inclined pipe, and then flows upwards at an angle through the third flow channel. The third and fourth flow channels are connected by an arc-shaped connecting channel, forming a continuous transition. When the water flows through the filter ring, impurities are intercepted in the cavity formed by the inclined wall and the plug cap. During maintenance, the plug cap can be removed and the filter residue cleaned by rotating the movable nut. The pressure sensor interface and temperature sensor interface are respectively connected to the control system, forming a closed-loop monitoring circuit.

[0070] Compared to existing technologies, traditional filters, with their right-angle bends, are prone to generating eddies that lead to impurity buildup. This solution, however, utilizes a combination of arc-shaped connecting channels and inclined flow paths to achieve a smooth change in water flow direction. Existing technologies with fixed pipe joints make filter cleaning difficult; this solution's combination of movable nuts and caps allows for tool-free, quick assembly and disassembly. Conventional filtration devices lack status monitoring capabilities; this solution integrates a sensor interface to provide real-time feedback of operating parameters.

[0071] Through the above technical solution, this application effectively reduces the water flow resistance inside the filter, preventing impurities from accumulating and clogging at bends. The detachable connection structure significantly improves the maintenance convenience of the filter ring, and the dual sensor interface configuration provides the system with basic data for pressure fluctuation early warning and thermal efficiency analysis, thereby ensuring the stable operation of the heating system under complex operating conditions.

[0072] This application further proposes that the outlet end of the second filter 6 is equipped with a water flow sensor 27.

[0073] The second filter has the same structure as the first filter. The water flow sensor is a device used to detect the flow rate at the outlet of domestic water. Specifically, it can be implemented using a turbine or electromagnetic flow meter. Its signal output is connected to the control system to provide real-time feedback of flow data and control the opening and closing of the first three-way switching valve 1 and the second three-way switching valve 2.

[0074] Specifically, after passing through the second filter, domestic water enters the water flow sensor. The water flow sensor generates an electrical signal by measuring the volume or flow rate of the liquid flowing through the pipe and transmits this signal to the control system. The control system determines the domestic water demand status based on preset flow thresholds. For example, when the flow rate exceeds the set value, it automatically adjusts the opening of the first three-way switching valve and the second three-way switching valve to increase the heat exchange supply of central heating hot water to domestic water. If the flow rate is lower than the set value, it reduces the allocation ratio of heat exchange hot water to prioritize the hot water supply to the underfloor heating system.

[0075] Through the above technical solution, this application can automatically adjust the distribution ratio of heating hot water according to the actual demand of domestic water, avoid insufficient heat exchange or delayed underfloor heating caused by sudden changes in domestic water flow, and reduce the risk of pipe blockage caused by impurity accumulation, thus ensuring the stability and response efficiency of the system operation.

[0076] 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 domestic water and underfloor heating water control system suitable for centralized heating systems, characterized in that: It includes a centralized heating water system, a floor heating water system, and a domestic water system. The hot water from the centralized heating water system is directly supplied to the floor heating water system and to the domestic water system through a control system. The domestic cold water from the domestic water system is converted into domestic hot water through a heat exchanger with the centralized heating hot water. The control system includes a first three-way switching valve (1) and a second three-way switching valve (2). The second three-way switching valve (2) controls the flow of hot water from the centralized heating water system to the underfloor heating water system and the flow of hot water for heat exchange to the domestic water system; The first three-way switching valve (1) controls whether the hot water of the centralized heating water system provides heat exchange hot water to the domestic water pipeline system.

2. The domestic water and floor heating water control system suitable for a district heating system according to claim 1, characterized in that: The central heating water system includes a central heating inlet pipe (45), which is connected to the first interface (7) of a three-way connector (5) through a second three-way switching valve (2). The three-way connector (5) also includes a second interface (8) and a third interface (9). The second interface (8) is connected to the underfloor heating water supply pipe (44). The hot water in the underfloor heating water supply pipe (44) flows back to the central heating inlet pipe (45) after passing through the underfloor heating pipe. The third interface (9) is connected to the hot water inlet connector (40) of the heat exchange plate (4). The hot water inlet connector (40) is connected to the hot water outlet connector (42). The hot water outlet connector (42) is connected to one end of the hot water outlet pipe (48). The other end of the hot water outlet pipe (48) is connected to the central heating return pipe (49) through a first three-way switching valve (1). The central heating return pipe (49) is connected to the central heating inlet pipe (45).

3. A domestic water and underfloor heating water control system suitable for centralized heating systems according to claim 2, characterized in that: The heat exchange plate (4) is provided with a domestic water inlet connector (41) and a domestic water outlet connector (43) that are interconnected. The domestic water inlet connector (41) is connected to one end of the domestic water inlet pipe (46), and the other end of the domestic water inlet pipe (46) is connected to the second filter (6). The domestic water outlet connector (43) is connected to the domestic hot water outlet pipe (47).

4. A domestic water and underfloor heating water control system suitable for centralized heating systems according to claim 1, characterized in that: The first three-way switching valve (1) and the second three-way switching valve (2) both include a first straight pipe section (11) and a second straight pipe section (12) with an integral structure. The second straight pipe section (12) has an inlet (10) at one end and is connected to the pipe wall of the first straight pipe section (11) at the other end. The first straight pipe section has an outlet (13) at one end and is connected to a motor (22) at the other end. The first straight pipe section (11) has a valve port (14) inside. The motor (22) has a rotating spindle (18).

5. A domestic water and underfloor heating water control system suitable for centralized heating systems according to claim 4, characterized in that: The motor (22) is a permanent magnet motor. The outer circumference of the rotating spindle (18) is threaded, and the outer circumference of the thread is fixedly connected to the nut (20) on the inner wall of the first straight pipe section (11). During the rotation driven by the motor (22), the rotating spindle (18) moves back and forth along the axial direction of the nut (20) to control the opening and closing of the valve port (14).

6. A domestic water and underfloor heating water control system suitable for centralized heating systems according to claim 5, characterized in that: The nut (20) is a tubular structure. The outer wall of the tubular structure is sealed to the inner wall of the first straight pipe section (11) by a positioning ring (15) and a first sealing ring (16). The inner wall of the tubular structure is sealed to the outer wall of the rotating spindle (18) by a second sealing ring (23) and a third sealing ring (24) in parallel.

7. A domestic water and underfloor heating water control system suitable for centralized heating systems according to claim 4, characterized in that: The first straight pipe section (11) is connected to the motor (22) with a flange (17) at one end. The flange (17) is connected to one side of the mounting plate (21) by a positioning screw (19), and the other side of the mounting plate (21) is connected to the motor (22).

8. A domestic water and underfloor heating water control system suitable for centralized heating systems according to claim 2, characterized in that: A first filter (3) is provided between the central heating return water pipe (49) and the underfloor heating pipe. The first filter (3) includes a third straight pipe section (30) and an inclined pipe (31) with an integral structure. Both ends of the third straight pipe section (30) are connected to movable joints (35). The outer side of the middle pipe wall is connected to the inclined pipe (31). An inclined wall (38) is provided on the inner side of the inclined pipe (31). One end of the inclined wall (38) is integrally formed with the third straight pipe section (30). One side of the inclined wall (38) cooperates with the third straight pipe section (30) to form an inclined downward slope. The second flow channel (302) turns inside the inclined tube (31) and then forms a third flow channel (303) with the other side of the inclined wall (38) in conjunction with the inclined tube (31). The inclined tube (31) between the second flow channel (302) and the third flow channel (303) is provided with a filter ring (32). One end of the filter ring (32) is connected to the inclined wall (38), and the other end is connected to the end cap of the plug (33). The inner wall of the plug (33) is sealed to the inclined tube (31) by a fourth sealing ring (37).

9. A domestic water and floor heating water control system suitable for a district heating system according to claim 8, characterized in that: The second flow channel (302) is connected to the first flow channel (301) located in the water inlet direction of the third straight pipe section (30), and the third flow channel (303) is connected to the fourth flow channel (304) located in the water outlet direction of the third straight pipe section (30). An arc connecting channel (39) is provided between the third flow channel (303) and the fourth flow channel (304). The arc connecting channel (39) is located at the junction of the third straight pipe section (30) and the inclined pipe (31). The movable joint (35) is connected to the movable nut (34). The outer wall of the third straight pipe section (30) is provided with a pressure sensor interface (29) and a temperature sensor interface (28).

10. The domestic water and floor heating water control system suitable for a district heating system according to claim 3, characterized in that: The outlet end of the second filter (6) is equipped with a water flow sensor (27).

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