Gas water heater and control method thereof

Abstract

The present application relates to the technical field of gas water heater, and discloses a gas water heater and a control method thereof, which comprises a burner, a water inlet pipeline provided with a water inlet at one end, a water outlet pipeline connected with the other end of the water inlet pipeline, the water outlet pipeline comprising a heating pipe section for heat exchange with flue gas of the burner, a waterway valve provided with a water inlet end, a first water outlet end and a second water outlet end, the first water outlet end being communicated with a hot water outlet through a first waterway, the second water outlet end being communicated with the hot water outlet through a second waterway, the water inlet end being connected with the water outlet pipeline, the waterway valve having a first state of communicating the water inlet end with the first water outlet end and a second state of communicating the water inlet end with the second water outlet end, and a water mixing tank arranged in the first waterway, which can flexibly switch the water flow path according to the use requirement, effectively solve the problem of hot water delay caused by the remaining cold water in the water mixing tank after long-term inactivity, significantly shorten the waiting time of the user for hot water, and improve the bathing experience.

Description

Technical Field

[0001] This invention relates to the field of gas water heater technology, specifically to gas water heaters and their control methods. Background Technology

[0002] The mixing tank is installed at the hot water outlet of a gas water heater to reduce water temperature fluctuations during start-up and shutdown, thus improving the user's bathing comfort. The mixing tank works by equalizing the temperature difference between hot and cold water through its internal mixing chamber volume and improving the mixing efficiency through its internal mixing channels, resulting in a more uniform water temperature. In some technologies, when the water heater has not been used for an extended period, the water in the mixing tank becomes cold and needs to be drained, which prolongs the time it takes for hot water to come out. Summary of the Invention In view of this, the present invention provides a gas water heater and its control method to solve the problem of prolonged hot water output time in related technologies.

[0003] In a first aspect, the present invention provides a gas water heater, comprising: Burner; The water inlet pipe has a water inlet at one end; The water outlet pipe is connected to the other end of the water inlet pipe, and the water outlet pipe includes a heating pipe section that exchanges heat with the flue gas of the burner. A water valve has an inlet end, a first outlet end, and a second outlet end. The first outlet end is connected to a hot water outlet through a first water path, and the second outlet end is connected to the hot water outlet through a second water path. The inlet end is connected to the outlet pipe. The water valve has a first state in which the inlet end is connected to the first outlet end and a second state in which the inlet end is connected to the second outlet end. A mixing tank is located in the first water passage.

[0004] Beneficial Effects: Tap water enters the inlet pipe through the inlet of the inlet pipe, then flows to the outlet pipe. After being heated in the heating section, it flows to the water valve. During normal constant-temperature showering, the water valve is in the first state, and hot water flows through the first water path to the mixing tank. The mixing chamber inside the mixing tank evens out the water temperature, stabilizing the outlet water temperature, reducing temperature fluctuations, and avoiding the sudden changes in temperature caused by the start-up and shutdown of the gas water heater, ensuring a uniform and comfortable outlet water temperature. When the water heater has not been used for a long time and the mixing tank contains cold water, the water valve can be switched to the second state, allowing hot water to flow directly to the hot water outlet through the second water path. This eliminates the need to first drain the cold water from the mixing tank, quickly providing hot water and reducing water waste while improving the water heater's response speed. Therefore, this embodiment, by setting up a water valve, a first water path, and a second water path in the gas water heater, and placing the mixing tank in the first water path, allows for flexible switching of the water flow path according to usage needs. This effectively solves the problem of delayed hot water output caused by cold water remaining in the mixing tank after long periods of inactivity, significantly shortening the user's waiting time for hot water and improving the showering experience. It adopts a single water circuit valve to achieve dual-path switching, with a simple and reliable structure. Without significantly increasing the system complexity, it takes into account both the functions of rapid hot water output and constant temperature mixing, thus improving the water circuit control performance and user comfort of the gas water heater.

[0005] In one optional embodiment, the gas water heater includes a controller that is communicatively connected to the water valve. The controller can control the water valve to switch to the first state when it detects that the burner start-up interval is less than or equal to a first preset value, and control the water valve to switch to the second state when it detects that the burner start-up interval is greater than the first preset value.

[0006] Beneficial Effects: By adding a controller that communicates with the water circuit valve, automated intelligent control of water circuit switching is achieved, eliminating the need for manual operation and further enhancing ease of use. The controller automatically switches states based on the comparison between the burner start-up interval and a first preset value: When the start-up interval is short and residual hot water remains in the mixing tank, it automatically switches to the first state, fully utilizing the mixing tank's temperature and pressure stabilizing function to maintain stable water temperature and reduce fluctuations. When the burner start-up interval is long and the water in the mixing tank has completely cooled down, the controller automatically switches to the second state, directly skipping the mixing tank's water discharge, avoiding the cold water discharge process, achieving hot water immediately upon startup, significantly shortening waiting time and improving response speed.

[0007] In one optional embodiment, the mixing tank includes a tank body, an inlet pipe, and an outlet pipe. The side wall of the tank body is provided with an inlet port, and the bottom wall of the tank body is provided with an outlet port. The water inlet pipe extends into the tank body through the water inlet interface. The pipe wall of the water inlet pipe is provided with multiple water outlet holes. The center of each water outlet hole is not higher than the horizontal plane where the axis of the water inlet pipe is located. The water outlet pipe passes through the water outlet interface and extends into the tank body. The water outlet pipe is provided with a water inlet hole, which is higher than the water inlet pipe.

[0008] Beneficial effects: The inlet pipe extends into the tank body through the inlet interface. The pipe wall has multiple outlet holes, the center of which is not higher than the horizontal plane of the inlet pipe axis. Therefore, after hot water enters the inlet pipe, it flows out through the multiple outlet holes into the mixing tank. Since the center of the outlet hole is not higher than the horizontal plane of the inlet pipe axis, the water flowing out of the outlet hole flows downward into the mixing chamber of the mixing tank, where it mixes and exchanges heat with the remaining water in the mixing chamber, making the hot and cold water temperatures more uniform. The outlet pipe extends into the tank body through the outlet interface. The outlet pipe has an inlet hole, which is higher than the inlet pipe, ensuring that the water entering the inlet hole is fully mixed, thereby further suppressing water temperature fluctuations and improving the constant temperature effect of the outlet water. By ensuring the center of the water outlet is no higher than the horizontal plane of the inlet pipe's axis, it's guaranteed that the water flowing from the outlet will flow downwards, rather than directly towards the inlet of the outlet pipe. This extends the actual mixing path and residence time of the hot and cold water within the tank, enhancing temperature balance and maintaining a stable water temperature even when the gas water heater is frequently started and stopped, significantly improving the problem of fluctuating shower temperatures. Multiple water outlets on the inlet pipe wall allow water to enter the tank laterally in a dispersed and gentle manner, avoiding the localized turbulence and temperature stratification caused by direct water inflow, and ensuring more thorough contact between the hot water and the remaining water in the mixing tank.

[0009] In one alternative embodiment, the inlet pipe extends from one side wall of the tank body to near another opposite side wall, and the outlet holes are evenly distributed along the length of the inlet pipe.

[0010] Beneficial effects: The inlet pipe extends from one side wall of the tank body to near the opposite side wall, and the outlet holes are evenly distributed along the length of the inlet pipe. This allows hot water to be evenly distributed inside the tank body along the length of the inlet pipe, achieving multi-point synchronous water output. This significantly expands the contact area and mixing range of hot and cold water, significantly improves mixing efficiency, shortens temperature equalization time, avoids uneven temperature caused by localized concentrated water inlet, and further enhances the consistency of water temperature inside the tank. The through-type arrangement of the inlet pipe and the uniformly perforated structure are simple and easy to manufacture. Without increasing the volume and cost of the mixing tank, it maximizes the use of internal mixing volume, improves mixing effect and overall temperature control performance.

[0011] In one optional embodiment, the water inlet interface includes a first countersunk hole, the water inlet pipe is provided with a first countersunk platform, the shape of the first countersunk platform is adapted to the shape of the first countersunk hole, and the first countersunk hole is welded to the first countersunk platform.

[0012] Beneficial Effects: The water inlet interface and water inlet pipe utilize a structure where the first countersunk hole and the first countersunk platform are mutually adapted. Through the positioning and cooperation of the countersunk platform and the countersunk hole, rapid and precise positioning can be achieved during assembly, effectively preventing the water inlet pipe from shifting, tilting, or having inconsistent insertion lengths during welding, ensuring the stability of the internal flow channel structure of the mixing tank. The fitted shape of the first countersunk platform and the first countersunk hole increases the contact area and welding joint area between the water inlet pipe and the tank body, resulting in higher welding strength and more reliable sealing. Long-term use is less prone to leakage and weld failure, improving the pressure resistance and service life of the water system. The mating structure of the first countersunk platform and the first countersunk hole forms a natural welding bevel and sealing surface, simplifying the welding process, reducing welding difficulty, minimizing welding defects, and improving production assembly efficiency and product consistency.

[0013] In one optional embodiment, a first limiting part is provided on one side of the first sinkhole, and a second limiting part is provided on the first sinking platform. The second limiting part and the first limiting part are inserted and cooperate to limit the position of the water inlet pipe.

[0014] Beneficial effects: Through the insertion and engagement of the first and second limiting parts, the inlet pipe can be dually limited in both circumferential and axial directions before welding, further preventing problems such as rotation, offset, or uneven depth of the inlet pipe during assembly and welding, ensuring the precise and stable pre-set installation position of the inlet pipe within the tank. The first and second limiting parts, together with the positioning surfaces of the first countersunk platform and the first countersunk hole, achieve multiple positioning constraints, significantly reducing the accumulation of assembly tolerances, ensuring that the distribution direction and height position of the outlet holes are consistent with the design, thereby stably achieving uniform water distribution throughout the tank and ensuring consistently reliable water mixing effects.

[0015] In one optional embodiment, the water outlet includes a second countersunk hole, and the water outlet pipe is provided with a second countersunk platform. The shape of the second countersunk platform is adapted to the shape of the second countersunk hole, and the second countersunk hole is welded to the second countersunk platform.

[0016] Beneficial effects: The outlet interface and outlet pipe adopt a matching structure of a second countersunk hole and a second countersunk platform, which allows for quick centering and precise alignment during assembly. This ensures that the height and orientation of the outlet pipe extending into the tank are consistent with the design position, and that the inlet hole is always stably higher than the inlet pipe, maintaining an ideal flow field for staggered water intake. The fitted shape of the second countersunk platform and the second countersunk hole effectively increases the welding contact area, improves weld strength and sealing reliability, and provides long-term pressure and vibration resistance, reducing the likelihood of leaks, weld detachment, and other failures, thus improving the overall durability of the mixing tank. The fit between the second countersunk platform and the second countersunk hole forms a regular welding transition surface, which simplifies the welding process, reduces the welding defect rate, and ensures a smooth connection of the tank inner wall without obvious protrusions or dead corners, preventing impurity accumulation and water turbulence, and ensuring the quality and efficiency of the mixed water.

[0017] In one optional embodiment, the water outlet pipe is provided with a balance hole located inside the tank body and near the second settling platform.

[0018] Beneficial effects: A balance hole is installed in the water outlet pipe near the second settling platform, inside the main body of the tank. The balance hole can disrupt the conditions for negative pressure formation in the pipe, avoid the formation of local cavities when the fluid moves rapidly, and prevent the formation of vacuum siphon or local negative pressure in the water outlet pipe. This prevents the water from flowing intermittently or erratically due to negative pressure. Combined with the mixing function of the mixing tank, it further improves the continuity of water flow and pressure stabilization, and enhances the water flow experience during showering.

[0019] In one optional embodiment, the top of the tank body is provided with an installation limiting part, which cooperates with the end of the water outlet pipe to limit the position of the water outlet pipe.

[0020] Beneficial Effects: The installation limiting part at the top of the tank body cooperates with the end of the water outlet pipe for limiting. Combined with the positioning structure of the second countersunk platform and second countersunk hole at the bottom, it forms a synchronous limiting at both ends, achieving bidirectional positioning constraint of the water outlet pipe. This double fixation from the root and end completely prevents the water outlet pipe from tilting, shaking, or shifting under water pressure impact and water flow disturbance. It precisely ensures the height and horizontal position of the water inlet hole on the water outlet pipe, stably maintaining a design layout higher than the water inlet pipe, ensuring priority extraction of hot water and uniform mixing temperature. The installation limiting part directly constrains the end of the water outlet pipe, effectively offsetting welding stress and deformation caused by long-term use, preventing the water outlet pipe from sagging or becoming eccentric, ensuring that the flow field structure inside the tank always meets the design expectations, and that the mixing effect does not diminish over time. Furthermore, the cooperation between the installation limiting part and the end of the water outlet pipe facilitates quick alignment and one-time installation during assembly, eliminating the need for additional tooling adjustments, further improving assembly accuracy and production efficiency, and ensuring consistency of batch products. Furthermore, the top limiting structure is simple and compact, does not occupy the effective mixing volume inside the tank, and does not interfere with the internal water flow state. Without affecting the mixing efficiency, it further improves the structural reliability and service life.

[0021] In one optional embodiment, the bottom of the tank body is provided with a mounting flange hole, the tank body includes a drain plug assembly, the drain plug assembly includes a fixing ring, a sealing ring and a drain plug, the outer diameter of the fixing ring is adapted to the inner diameter of the mounting flange hole, the end of the drain plug is inserted into the fixing ring, and the sealing ring is disposed between the drain plug and the fixing ring.

[0022] Beneficial effects: The tank body has mounting flange holes at the bottom, along with a drain plug assembly, enabling bottom drainage and sludge removal from the mixing tank. This facilitates the regular removal of accumulated impurities, scale, and residual cold water, preventing internal blockages and water quality deterioration, thus improving water hygiene and system durability. The outer diameter of the fixing ring precisely matches the inner diameter of the mounting flange holes, ensuring easy positioning and a tight fit during assembly. This guarantees installation strength and provides stable support for the drain plug, reducing the risk of loosening and leakage. A sealing ring is installed between the drain plug and the fixing ring, forming a reliable sealing structure. This effectively prevents water leakage during normal use and ensures reliable sealing and smooth disassembly during sludge removal, balancing sealing performance and maintainability.

[0023] In one optional embodiment, the bottom of the tank body is provided with a bracket positioning part, which cooperates with a fixed bracket for positioning. The fixed bracket is fixed to the bottom of the tank body and is used to fix the mixing tank to the bottom shell of the gas water heater.

[0024] Beneficial effects: By setting a bracket positioning part at the bottom of the tank body, it is easy to connect with the fixed bracket. The fixed bracket makes it easy to fix the mixing tank to the bottom shell of the gas water heater.

[0025] In one optional embodiment, the tank body includes an upper tank and a lower tank, the upper tank and the lower tank forming a mixing chamber, and the water inlet is located on the upper tank.

[0026] Beneficial effects: The tank body adopts a split-type structure of upper and lower tanks, which facilitates mold processing, simplifies molding, reduces the overall manufacturing difficulty of the tank, and is conducive to mass production, improving production efficiency and product consistency. The split structure allows for the pre-assembly and positioning of internal components such as inlet and outlet pipes before overall assembly and welding, providing more assembly space, making operation more convenient, and improving the installation accuracy of internal pipelines.

[0027] Secondly, the present invention provides a control method for a gas water heater, applied to the aforementioned gas water heater, the control method comprising: Obtain the burner start-up interval; If the burner start-up interval is less than or equal to a first preset value, the water valve is controlled to switch to the first state. If the burner start-up interval is greater than the first preset value, the water valve is controlled to switch to the second state.

[0028] Beneficial effects: By acquiring the burner start-up interval, if the burner start-up interval is less than or equal to a first preset value, and residual hot water remains in the mixing tank, the water circuit valve is automatically switched to the first state to fully utilize the temperature and pressure stabilizing function of the mixing tank, maintaining stable water temperature and reducing fluctuations. If the burner start-up interval is greater than the first preset value, and the water in the mixing tank has completely cooled down, the water circuit valve is automatically switched to the second state, directly skipping the water discharge from the mixing tank, avoiding the cold water discharge process, achieving hot water output immediately upon startup, significantly shortening waiting time and improving response speed. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a gas water heater according to an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the intermediate mixing tank; Figure 3 This is a front view of the mixing tank; Figure 4 This is a right view of the mixing tank; Figure 5 This is a left view of the mixing tank; Figure 6 This is a bottom view of the mixing tank; Figure 7 This is a top view of the mixing tank; Figure 8 for Figure 3 AA section view; Figure 9 for Figure 8 Enlarged view of point C in the middle; Figure 10 for Figure 4 BB cross-sectional view; Figure 11 This is an exploded view of the mixing tank; Figure 12 This is a schematic diagram of the upper tank. Figure 13 This is a schematic diagram of the lower tank. Figure 14 This is a schematic diagram of the water inlet pipe; Figure 15 This is a schematic diagram of the water outlet pipe.

[0031] Explanation of reference numerals in the attached figures: 1. Burner; 2. Inlet pipe; 201. Inlet; 3. Outlet pipe; 301. Heating pipe section; 4. Water valve; 5. First water circuit; 6. Second water circuit; 7. Hot water outlet; 8. Heat exchanger; 9. Water flow sensor; 10. Outlet water temperature sensor; 11. Dry-burning protection limit switch; 12. Fan; 13. Mixing tank; 1301. Tank body; 13011. Upper tank body; 130111. First countersunk hole; 130112. First limiting part; 130113. Installation limiting part; 13012. Lower tank body; 130121. 130122, Second countersunk hole; 130123, Mounting flange hole; 1302, Bracket positioning part; 1302, Water inlet pipe; 13021, Water outlet hole; 13022, First countersunk platform; 13023, Second limiting part; 13024, Connecting flange; 1303, Water outlet pipe; 13031, Water inlet hole; 13032, Second countersunk platform; 13033, Balance hole; 13034, Connector pipe thread; 14, Fixing ring; 15, Sealing ring; 16, Drain plug; 17, Fixing bracket; 1701, Positioning hole; 18, Gas pipeline; 19, Gas proportional valve. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] The mixing tank 13 is installed at the hot water outlet of the gas water heater to reduce water temperature fluctuations during start-up and shutdown, thereby improving the user's bathing comfort. The mixing tank 13 works by equalizing the temperature difference between hot and cold water through its internal mixing chamber volume and improving the mixing efficiency of hot and cold water through its internal mixing channels, resulting in a more uniform water temperature after mixing. In related technologies, when the user has not used the water heater for a long time, the water in the mixing tank 13 will be cold, requiring the water to be drained, which prolongs the time it takes for hot water to come out.

[0037] Specifically, when the user has not used the water tank for a long time, the water in the mixing tank 13 is cold. If hot water directly enters the mixing tank 13 and mixes with the cold water in the mixing tank 13 before flowing out, the water temperature will be too low. Therefore, some of the cold water needs to be drained first, which will prolong the hot water time and make the user wait longer.

[0038] The following is combined Figures 1 to 15 The following describes embodiments of the present invention.

[0039] According to embodiments of the present invention, in one aspect, a gas water heater is provided, such as... Figure 1 As shown, it includes a burner 1, a water inlet pipe 1302, a water outlet pipe 3, a water valve 4, and a mixing tank 13.

[0040] The water inlet pipe 2 has an inlet 201 at one end; the water outlet pipe 3 is connected to the other end of the water inlet pipe 2, and the water outlet pipe 3 includes a heating pipe section 301 for heat exchange with the flue gas of the burner 1; the water valve 4 has an inlet end, a first outlet end, and a second outlet end, the first outlet end is connected to the hot water outlet 7 through a first water passage 5, the second outlet end is connected to the hot water outlet 7 through a second water passage 6, the inlet end is connected to the water outlet pipe 3, and the water valve 4 has a first state that connects the inlet end to the first outlet end and a second state that connects the inlet end to the second outlet end; the mixing tank 13 is located in the first water passage 5.

[0041] In this embodiment, tap water enters the inlet pipe 2 through the inlet 201 and then flows to the outlet pipe 3. After being heated in the heating section 301, it flows to the water valve 4. During normal constant-temperature showering, the water valve 4 is in the first state, and hot water passes through the first water path 5 and then through the mixing tank 13. The mixing chamber inside the mixing tank 13 balances the water temperature, stabilizes the outlet water temperature, reduces water temperature fluctuations, and avoids the sudden hot and cold phenomenon caused by the start and stop of the gas water heater, ensuring a uniform and comfortable outlet water temperature. When the water heater has not been used for a long time and the mixing tank 13 contains cold water, the water valve 4 can be switched to the second state, allowing hot water to flow directly through the second water path 6 to the hot water outlet 7. Hot water can be quickly dispensed without first emptying the cold water in the mixing tank 13, reducing water waste and improving the response speed of the water heater. Therefore, this embodiment sets up a water valve 4, a first water path 5, and a second water path 6 in the gas water heater, and arranges the mixing tank 13 in the first water path 5. The water flow path can be flexibly switched according to usage needs, effectively solving the problem of cold water remaining in the mixing tank 13 after a long period of inactivity, which causes a delay in hot water output. This significantly shortens the time users wait for hot water and improves the bathing experience. This embodiment uses a single water circuit valve 4 to achieve dual-path switching. The structure is simple and reliable. Without significantly increasing the system complexity, it takes into account both the functions of rapid hot water output and constant temperature mixing, thus improving the water circuit control performance and user comfort of the gas water heater.

[0042] In one specific embodiment, the burner 1 is connected to a gas pipeline 18, and the gas pipeline 18 is equipped with a gas proportional valve 19.

[0043] In one embodiment, the gas water heater includes a controller that is communicatively connected to a water valve 4. The controller can control the water valve 4 to switch to a first state when it detects that the burner 1 start-up interval is less than or equal to a first preset value, and control the water valve 4 to switch to a second state when it detects that the burner 1 start-up interval is greater than the first preset value.

[0044] In this embodiment, by adding a controller that communicates with the water valve 4, automated intelligent control of water circuit switching is achieved, eliminating the need for manual operation by the user and further improving ease of use. The controller automatically switches states based on the comparison between the burner 1 start-up interval and a first preset value: when the start-up interval is short and residual hot water remains in the mixing tank 13, it automatically switches to the first state, fully utilizing the temperature and pressure stabilizing function of the mixing tank 13 to maintain stable water temperature and reduce fluctuations. When the burner 1 start-up interval is long and the water in the mixing tank 13 has completely cooled down, the controller automatically switches to the second state, directly skipping the water discharge from the mixing tank 13, avoiding the cold water discharge process, achieving hot water output immediately upon startup, significantly shortening waiting time and improving response speed. This embodiment achieves automated intelligent control of water circuit switching by setting a controller that communicates with water valve 4. It achieves an adaptive balance between constant temperature comfort and timely water delivery, ensuring bathing comfort during frequent daily use while resolving the issue of slow hot water output after prolonged periods of inactivity. Automatic control without additional operational steps optimizes the overall water usage experience, reduces water waste, and enhances the intelligence level and competitiveness of gas water heaters without increasing user complexity.

[0045] Specifically in one embodiment, such as Figure 1 As shown, the inlet pipe 2 is equipped with a water pump and a water flow sensor 9, and the outlet pipe 3 is equipped with an outlet water temperature sensor 10. The controller is communicatively connected to the water flow sensor 9, the outlet water temperature sensor 10, and the water pump, enabling real-time monitoring and precise control of water temperature and flow. The water flow sensor 9 can detect the water start signal and water flow magnitude in real time, and works with the outlet water temperature sensor 10 to collect the actual outlet water temperature, providing accurate and reliable data support for the controller to determine the start-stop interval of the burner 1 and the timing of water circuit switching, avoiding misjudgment or switching lag. Based on the real-time flow and water temperature signals, the controller intelligently drives the water pump and water circuit valve 4 to work together according to the start-up interval of the burner 1. When hot water is needed quickly, the water pump can accelerate the water circulation and push, further shortening the waiting time for hot water and improving the start-up response speed. In constant temperature shower mode, the water pump can work with the mixing tank 13 to stabilize the water pressure and flow rate, and with the feedback from the outlet water temperature sensor 10, suppress water temperature fluctuations, reduce start-stop impact, and make the outlet water temperature more uniform and gentle, avoiding sudden changes in temperature and water flow. Through the coordinated control of multiple sensors, water pumps, and water valves, the entire process is automated and intelligent. It can automatically switch between long-term shutdown for rapid heating and short-term shutdown for constant temperature mixing without manual intervention, thereby improving the control accuracy and operational stability of the gas water heater.

[0046] In one embodiment, the water outlet pipe 3 is also equipped with a dry-burning protection limiter 11. The dry-burning protection limiter 11 can monitor the temperature of the heating pipe section 301 and the water outlet pipe 3 in real time. When an abnormally high temperature is detected and there is a risk of dry burning, it can quickly trigger a protection signal and feed it back to the controller, promptly cutting off the operation of the burner 1 or intervening with the water pump and water valve 4 to prevent overheating damage to components. The dry-burning protection limiter 11 and the controller work together to form a multi-layered safety protection mechanism, effectively preventing the water heater from dry burning in the event of no water, water shortage, or abnormal water flow, significantly improving the overall safety and reliability of the unit.

[0047] In one embodiment, a heat exchanger 8 is provided above the burner 1, and a heating pipe section 301 passes through the heat exchanger 8. By placing the heating pipe section 301 through the heat exchanger 8 above the burner 1, the water flow and high-temperature flue gas can achieve sufficient and efficient heat exchange, significantly improving the utilization rate of gas thermal energy and reducing heat loss. The high-temperature flue gas generated by the burner 1 acts concentratedly on the heat exchanger 8, and with the heating pipe section 301 passing through it, the heat exchange area is maximized and the heat exchange efficiency is stabilized, allowing for faster water temperature increase with the same gas consumption and further shortening the hot water output time.

[0048] In one embodiment, the gas water heater further includes a fan 12, which, when operating, draws the flue gas generated by the burner 1 into the exhaust pipe.

[0049] In one embodiment, such as Figures 2 to 11 As shown, the mixing tank 13 includes a tank body 1301, an inlet pipe 1302, and an outlet pipe 1303. The side wall of the tank body 1301 is provided with an inlet interface, and the bottom wall of the tank body 1301 is provided with an outlet interface. The inlet pipe 1302 extends into the tank body 1301 through the inlet interface. The pipe wall of the inlet pipe 1302 is provided with multiple outlet holes 13021. The center of the outlet hole 13021 is not higher than the horizontal plane where the axis of the inlet pipe 1302 is located. The outlet pipe 1303 extends into the tank body 1301 through the outlet interface. The outlet pipe 1303 is provided with an inlet hole 13031. The inlet hole 13031 is higher than the inlet pipe 1302.

[0050] In this embodiment, the inlet pipe 1302 extends into the tank body 1301 through the inlet interface. The pipe wall of the inlet pipe 1302 has multiple outlet holes 13021. The center of each outlet hole 13021 is not higher than the horizontal plane where the axis of the inlet pipe 1302 is located. Therefore, after hot water enters the inlet pipe 1302, it flows out through the multiple outlet holes 13021 into the mixing tank 13. Because the center of each outlet hole 13021 is not higher than the horizontal plane where the axis of the inlet pipe 1302 is located, hot water flows out through the outlet holes 13021 into the mixing tank 13. Water flowing from water hole 13021 flows downwards into the mixing chamber of mixing tank 13, where it mixes and exchanges heat with the remaining water, resulting in a more uniform hot and cold water temperature. Water outlet pipe 1303 extends through the water outlet interface into the tank body 1301. Water outlet pipe 1303 has an inlet hole 13031, which is higher than water inlet pipe 1302. This ensures that the water entering water inlet hole 13031 is fully mixed, further suppressing water temperature fluctuations and improving the constant water temperature. Because the center of water outlet hole 13021 is not higher than the horizontal plane of the axis of water inlet pipe 1302, water flowing from water outlet hole 13021 flows downwards instead of directly into water inlet hole 13031 of water outlet pipe 1303. This prolongs the actual mixing path and residence time of hot and cold water within the tank, enhancing the temperature difference balance effect. Even with frequent start-stop cycles of the gas water heater, the water temperature remains stable, significantly improving the problem of fluctuating hot and cold water during showers. By providing multiple water outlet holes 13021 on the wall of the inlet pipe 1302, the water flow can enter the tank laterally in a dispersed and gentle manner, avoiding local turbulence and temperature stratification caused by direct water inlet, and allowing the hot water to come into fuller contact with the residual water in the mixing tank.

[0051] The mixing tank 13 requires no additional stirring or power components inside; it can achieve efficient water mixing through its structural layout. The structure is simple and reliable, not prone to clogging, and easy to maintain.

[0052] In one specific embodiment, the inlet pipe 1302 extends horizontally through the inlet interface into the tank body 1301. The pipe wall of the inlet pipe 1302 is provided with multiple outlet holes 13021, and the center of the outlet holes 13021 is not higher than the horizontal plane where the axis of the inlet pipe 1302 is located. The outlet pipe 1303 extends vertically through the outlet interface into the tank body 1301. The outlet pipe 1303 is provided with an inlet hole 13031, which is higher than the inlet pipe 1302.

[0053] In one embodiment not shown in the figure, the water inlet pipe 1302 may be installed at an angle.

[0054] In one embodiment not shown in the figure, the water outlet pipe 1303 may be installed at an angle.

[0055] In one embodiment, the inlet pipe 1302 extends from one side wall of the tank body 1301 to near the other opposite side wall, and the outlet holes 13021 are evenly distributed along the length of the inlet pipe 1302.

[0056] In this embodiment, the inlet pipe 1302 extends from one side wall of the tank body 1301 to near the opposite side wall. The outlet holes 13021 are evenly distributed along the length of the inlet pipe 1302, allowing hot water to be evenly distributed inside the tank body 1301 along the length of the inlet pipe 1302. This enables simultaneous water output from multiple points, significantly expanding the contact area and mixing range of hot and cold water, greatly improving mixing efficiency, shortening temperature equalization time, avoiding uneven temperature caused by localized concentrated water intake, and further enhancing the consistency of water temperature inside the tank. The through-type arrangement and uniformly perforated structure of the inlet pipe 1302 are simple and easy to manufacture. Without increasing the volume and cost of the mixing tank 13, it maximizes the use of the internal mixing volume, improving the mixing effect and the overall temperature control performance.

[0057] In one specific embodiment, multiple water outlets 13021 are respectively arranged horizontally, inclined downwards, and vertically downwards. The multi-directional water outlets 13021 can further improve the water mixing efficiency, shorten the temperature equalization time, avoid local concentrated water intake causing uneven temperature, and further improve the water temperature consistency in the tank.

[0058] In one embodiment, such as Figure 12 and Figure 14 As shown, the water inlet interface includes a first countersunk hole 130111, and the water inlet pipe 1302 is provided with a first countersunk platform 13022. The shape of the first countersunk platform 13022 is adapted to the shape of the first countersunk hole 130111, and the first countersunk hole 130111 and the first countersunk platform 13022 are welded together.

[0059] In this embodiment, the water inlet interface and the water inlet pipe 1302 adopt a structure in which the first countersunk hole 130111 and the first countersunk platform 13022 are mutually adapted. Through the positioning and cooperation of the countersunk platform and the countersunk hole, rapid and accurate positioning can be achieved during assembly, effectively preventing the water inlet pipe 1302 from shifting, tilting, or having inconsistent insertion lengths during welding, thus ensuring the stability of the internal flow channel structure of the mixing tank 13. The shape adaptation and fit between the first countersunk platform 13022 and the first countersunk hole 130111 increases the contact area and welding joint area between the water inlet pipe 1302 and the tank body 1301, resulting in higher welding strength, more reliable sealing, and less likelihood of leakage or weld failure during long-term use, thereby improving the pressure resistance and service life of the water system. The matching structure of the first countersunk platform 13022 and the first countersunk hole 130111 can form a natural welding bevel and sealing surface, simplifying the welding process, reducing welding difficulty, reducing welding defects, and improving production assembly efficiency and product consistency. In addition, this connection method makes the structure of the water inlet pipe 1302 and the tank body 1301 flat and smooth, and will not form protrusions or steps in the tank to interfere with the water flow, avoid the generation of local eddies, dead water areas or impurity accumulation, further ensure uniform mixing of hot and cold water and improve the mixing effect. In this embodiment, the water inlet interface and the water inlet pipe 1302 adopt a structure in which the first countersunk hole 130111 and the first countersunk platform 13022 are mutually adapted. Combined with the through arrangement of the water inlet pipe 1302 and the structure of multiple holes for uniform water discharge, the reliable welding connection can ensure that the water inlet pipe 1302 does not loosen or deform under long-term water flow impact, maintains a stable water distribution and mixing state, and improves the reliability and durability of the whole machine.

[0060] In one embodiment, a first limiting part 130112 is provided on one side of the first countersunk hole 130111, and a second limiting part 13023 is provided on the first countersunk platform 13022. The second limiting part 13023 and the first limiting part 130112 are inserted and cooperated to limit the position of the water inlet pipe 1302.

[0061] In this embodiment, the insertion and engagement of the first limiting part 130112 and the second limiting part 13023 allows for dual circumferential and axial limiting of the water inlet pipe 1302 before welding. This further prevents the water inlet pipe 1302 from rotating, shifting, or exhibiting uneven depths during assembly and welding, ensuring the precise and stable pre-installed position of the water inlet pipe 1302 within the tank. The first limiting part 130112 and the second limiting part 13023, in conjunction with the positioning surfaces of the first countersunk platform 13022 and the first countersunk hole 130111, achieve multiple positioning constraints, significantly reducing the accumulation of assembly tolerances. This ensures that the distribution direction and height of the water outlet hole 13021 are consistent with the design, thereby stably achieving uniform water distribution throughout the tank and guaranteeing a consistently reliable mixing effect.

[0062] In one specific embodiment, further reference is made to... Figure 12 and Figure 14 The first limiting part 130112 is a limiting notch, and the second limiting part 13023 is a limiting protrusion. The limiting protrusion is inserted into the limiting notch to prevent the water inlet pipe 1302 from rotating circumferentially after being inserted into the water inlet interface.

[0063] In one embodiment, the end of the water inlet pipe 1302 located outside the tank body 1301 is provided with a connecting flange 13024 for easy connection to a water pipe.

[0064] In one embodiment, reference Figure 13 and Figure 15The water outlet includes a second countersunk hole 130121, and the water outlet pipe 1303 is provided with a second countersunk platform 13032. The shape of the second countersunk platform 13032 is adapted to the shape of the second countersunk hole 130121, and the second countersunk hole 130121 and the second countersunk platform 13032 are welded.

[0065] In this embodiment, the water outlet interface and the water outlet pipe 1303 adopt a matching structure of the second countersunk hole 130121 and the second countersunk platform 13032. During assembly, this allows for rapid centering and precise alignment, ensuring that the height and orientation of the water outlet pipe 1303 extending into the tank are consistent with the design position. This ensures that the water inlet hole 13031 is always stably higher than the water inlet pipe 1302, maintaining an ideal flow field for staggered water intake. The shape of the second countersunk platform 13032 and the second countersunk hole 130121 fits closely, effectively increasing the welding contact area, improving weld strength and sealing reliability. Long-term use provides pressure resistance and vibration resistance, reducing the likelihood of leaks, weld detachment, and other failures, thus improving the overall durability of the mixing tank 13. The cooperation between the second countersunk platform 13032 and the second countersunk hole 130121 forms a regular welding transition surface, simplifying the welding process, reducing the welding defect rate, and ensuring a smooth connection of the tank inner wall without obvious protrusions or dead corners. This avoids impurity accumulation and water turbulence, ensuring the quality and efficiency of the mixed water.

[0066] In one embodiment, the water outlet pipe 1303 is provided with a balance hole 13033 located inside the tank body 1301 and near the second sinking platform 13032.

[0067] In this embodiment, a balance hole 13033 is provided in the water outlet pipe 1303 near the second settling platform 13032 and inside the tank body 1301. The balance hole 13033 can disrupt the negative pressure formation conditions inside the pipe, avoid the formation of local cavities when the fluid moves rapidly, and prevent the formation of vacuum siphon or local negative pressure in the water outlet pipe 1303. This prevents the water from being intermittent or fluctuating due to negative pressure. Combined with the mixing function of the mixing tank 13, it further improves the continuity of water output and the pressure stabilization effect, and improves the water flow experience during showering.

[0068] In one embodiment, the top of the tank body 1301 is provided with an installation limiting part 130113, which cooperates with the end of the water outlet pipe 1303 to limit the position of the water outlet pipe 1303.

[0069] In this embodiment, a limiting part 130113 is provided at the top of the tank body 1301, which cooperates with the end of the water outlet pipe 1303 for limiting. Combined with the positioning structure of the second recessed platform 13032 and the second recessed hole 130121 at the bottom, it forms a synchronous limiting at both ends, achieving bidirectional positioning constraint of the water outlet pipe 1303 from top to bottom. This double fixation from the root and end completely prevents the water outlet pipe 1303 from tilting, shaking, or shifting under water pressure impact and water flow disturbance. It precisely ensures the height and horizontal position of the water inlet hole 13031 on the water outlet pipe 1303, stably maintaining a design layout higher than the water inlet pipe 1302, ensuring priority extraction of hot water and uniform mixing temperature. The limiting part 130113 directly constrains the end of the water outlet pipe 1303, effectively offsetting welding stress and deformation caused by long-term use, preventing the water outlet pipe 1303 from sagging or becoming eccentric, ensuring that the flow field structure inside the tank always meets the design expectations, and that the mixing effect does not decrease with use. Furthermore, the installation limiting part 130113 and the end of the water outlet pipe 1303 cooperate to limit the alignment during assembly, facilitating quick alignment and one-time placement without the need for additional tooling adjustments. This further improves assembly accuracy and production efficiency, ensuring consistency in batch products. Moreover, the top limiting structure is simple and compact, does not occupy the effective mixing volume inside the tank, and does not interfere with the internal water flow. Without affecting the mixing efficiency, it further improves structural reliability and service life.

[0070] In one specific embodiment, the mounting limiting part 130113 is formed by pressing down a partial position on the top of the tank body 1301, which facilitates the processing and formation of the mounting limiting part 130113.

[0071] In one specific embodiment, the end of the water outlet pipe 1303 located outside the tank body 1301 is provided with a connector pipe thread 13034, which facilitates connection with the water outlet switch at the hot water outlet 7.

[0072] In one embodiment, the bottom of the tank body 1301 is provided with a mounting flange hole 130122. The tank body 1301 includes a drain plug assembly, which includes a retaining ring 14, a sealing ring 15, and a drain plug 16. The outer diameter of the retaining ring 14 is adapted to the inner diameter of the mounting flange hole 130122. The end of the drain plug 16 is inserted into the retaining ring 14, and the sealing ring 15 is disposed between the drain plug 16 and the retaining ring 14.

[0073] In this embodiment, the bottom of the tank body 1301 is provided with a mounting flange hole 130122 and a matching drain plug assembly, realizing the bottom sewage discharge and drainage functions of the mixing tank 13. This facilitates the regular discharge of impurities, scale, and residual cold water deposited in the tank, preventing internal blockage and water quality deterioration, and improving water hygiene and system durability. The outer diameter of the fixing ring 14 is precisely matched with the inner diameter of the mounting flange hole 130122, making positioning simple and tight during assembly. This ensures installation strength and provides stable support for the drain plug 16, reducing the risk of loosening and leakage. A sealing ring 15 is provided between the drain plug 16 and the fixing ring 14 to form a reliable sealing structure. This effectively prevents water leakage during normal use and ensures reliable sealing and smooth disassembly during sewage discharge, balancing sealing performance and maintainability.

[0074] In one embodiment, the bottom of the tank body 1301 is provided with a bracket positioning part 130123, which cooperates with the fixed bracket 17 for positioning. The fixed bracket 17 is fixed to the bottom of the tank body 1301 and is used to fix the mixing tank 13 to the bottom shell of the gas water heater.

[0075] In this embodiment, a bracket positioning part 130123 is provided at the bottom of the tank body 1301 to facilitate positioning and connection with the fixed bracket 17. The fixed bracket 17 facilitates fixing the mixing tank 13 to the bottom shell of the gas water heater.

[0076] In one specific embodiment, the bracket positioning part 130123 is a positioning pin, the fixed bracket 17 is provided with a positioning hole 1701, the positioning pin is inserted into the positioning hole 1701, and the fixed bracket 17 is welded to the bottom of the tank body 1301.

[0077] In one embodiment, the tank body 1301 includes an upper tank body 13011 and a lower tank body 13012, the upper tank body 13011 and the lower tank body 13012 forming a mixing chamber, and the water inlet is located on the upper tank body 13011.

[0078] In this embodiment, the tank body 1301 adopts a split-form structure of upper tank body 13011 and lower tank body 13012, which facilitates mold processing, simplifies molding, reduces the overall manufacturing difficulty of the tank, and is conducive to mass production, improving production efficiency and product consistency. The split-form structure facilitates the pre-assembly and positioning of internal components such as the inlet pipe 1302 and outlet pipe 1303 before overall assembly and welding, providing more assembly space, making operation more convenient, and improving the installation accuracy of internal pipelines.

[0079] In one specific embodiment, the upper tank 13011 and the lower tank 13012 are connected by riveting or clamping. If necessary, a sealant or sealant can be added at the joint to meet the sealing requirements.

[0080] According to an embodiment of the present invention, in another aspect, a control method for a gas water heater is provided, applied to the gas water heater provided in the above embodiments, the control method comprising: Obtain the start-up interval of burner 1; If the start-up interval of burner 1 is less than or equal to the first preset value, control water valve 4 is switched to the first state; If the start-up interval of burner 1 is greater than the first preset value, control water valve 4 switches to the second state.

[0081] In this embodiment, the burner 1 start-up interval is obtained. If the burner 1 start-up interval is less than or equal to a first preset value, and residual hot water remains in the mixing tank 13, the water circuit valve 4 is automatically switched to the first state to fully utilize the constant temperature and pressure stabilizing function of the mixing tank 13, maintaining stable water temperature and reducing fluctuations. If the burner 1 start-up interval is greater than the first preset value, and the water in the mixing tank 13 has completely cooled down, the water circuit valve 4 is automatically switched to the second state, directly skipping the water outlet of the mixing tank 13, avoiding the cold water discharge process, achieving hot water output immediately upon startup, significantly shortening the waiting time and improving the response speed.

[0082] In one specific embodiment, the first preset value ranges from 5 to 30 minutes.

[0083] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A gas water heater, characterized in that, include: Burner (1); Water inlet pipe (2), with a water inlet (201) at one end; The outlet pipe (3) is connected to the other end of the inlet pipe (2), and the outlet pipe (3) includes a heating pipe section (301) that exchanges heat with the flue gas of the burner (1). The water valve (4) has an inlet end, a first outlet end, and a second outlet end. The first outlet end is connected to the hot water outlet (7) through a first water passage (5), and the second outlet end is connected to the hot water outlet (7) through a second water passage (6). The inlet end is connected to the outlet pipe (3). The water valve (4) has a first state that connects the inlet end to the first outlet end and a second state that connects the inlet end to the second outlet end. A mixing tank (13) is located in the first water passage (5).

2. The gas water heater according to claim 1, characterized in that, The gas water heater includes a controller, which is communicatively connected to the water valve (4). When the start-up interval of the burner (1) is detected to be less than or equal to a first preset value, the controller can control the water valve (4) to switch to the first state. When the start-up interval of the burner (1) is detected to be greater than the first preset value, the controller can control the water valve (4) to switch to the second state.

3. The gas water heater according to claim 1 or 2, characterized in that, The mixing tank (13) includes a tank body (1301), an inlet pipe (1302), and an outlet pipe (1303). The side wall of the tank body (1301) is provided with an inlet port, and the bottom wall of the tank body (1301) is provided with an outlet port. The water inlet pipe (1302) extends through the water inlet interface into the tank body (1301). The pipe wall of the water inlet pipe (1302) is provided with a plurality of water outlet holes (13021). The center of the water outlet hole (13021) is not higher than the horizontal plane where the axis of the water inlet pipe (1302) is located. The water outlet pipe (1303) extends through the water outlet interface into the tank body (1301). The water outlet pipe (1303) is provided with a water inlet hole (13031), which is higher than the water inlet pipe (1302).

4. The gas water heater according to claim 3, characterized in that, The inlet pipe (1302) extends from one side wall of the tank body (1301) to near the other opposite side wall, and the outlet holes (13021) are evenly distributed along the length of the inlet pipe (1302).

5. The gas water heater according to claim 3, characterized in that, The water inlet interface includes a first countersunk hole (130111), and the water inlet pipe (1302) is provided with a first countersunk platform (13022). The shape of the first countersunk platform (13022) is adapted to the shape of the first countersunk hole (130111), and the first countersunk hole (130111) is welded to the first countersunk platform (13022).

6. The gas water heater according to claim 5, characterized in that, A first limiting part (130112) is provided on one side of the first countersunk hole (130111), and a second limiting part (13023) is provided on the first countersunk platform (13022). The second limiting part (13023) is inserted and cooperates with the first limiting part (130112) to limit the position of the water inlet pipe (1302).

7. The gas water heater according to claim 3, characterized in that, The water outlet includes a second countersunk hole (130121), and the water outlet pipe (1303) is provided with a second countersunk platform (13032). The shape of the second countersunk platform (13032) is adapted to the shape of the second countersunk hole (130121), and the second countersunk hole (130121) is welded to the second countersunk platform (13032).

8. The gas water heater according to claim 7, characterized in that, The water outlet pipe (1303) is provided with a balance hole (13033) located inside the tank body (1301) and near the second sink platform (13032).

9. The gas water heater according to claim 3, characterized in that, The top of the tank body (1301) is provided with an installation limiting part (130113), which cooperates with the end of the water outlet pipe (1303) to limit the position of the water outlet pipe (1303).

10. The gas water heater according to any one of claims 4 to 9, characterized in that, The bottom of the tank body (1301) is provided with a mounting flange hole (130122). The tank body (1301) includes a drain plug assembly, which includes a fixing ring (14), a sealing ring (15), and a drain plug (16). The outer diameter of the fixing ring (14) is adapted to the inner diameter of the mounting flange hole (130122). The end of the drain plug (16) is inserted into the fixing ring (14). The sealing ring (15) is disposed between the drain plug (16) and the fixing ring (14).

11. The gas water heater according to any one of claims 4 to 9, characterized in that, The bottom of the tank body (1301) is provided with a bracket positioning part (130123). The bracket positioning part (130123) cooperates with the fixed bracket (17) for positioning. The fixed bracket (17) is fixed to the bottom of the tank body (1301). The fixed bracket (17) is used to fix the mixing tank (13) on the bottom shell of the gas water heater.

12. The gas water heater according to any one of claims 4 to 9, characterized in that, The tank body (1301) includes an upper tank (13011) and a lower tank (13012), the upper tank (13011) and the lower tank (13012) forming a mixing chamber, and the water inlet is located on the upper tank (13011).

13. A control method for a gas water heater, characterized in that, The control method, applied to any one of claims 1 to 12, comprises: Obtain the burner (1) start-up interval time; If the burner (1) start-up interval is less than or equal to the first preset value, control the water valve (4) to switch to the first state; If the burner (1) starts at a time interval longer than the first preset value, the water valve (4) is switched to the second state.

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