Condensation type gas volumetric water heater

Abstract

The utility model provides a condensation type gas volumetric water heater. The condensation type gas volumetric water heater comprises a shell assembly, an inner container water storage container and a combustion and heat exchange system. The combustion and heat exchange system comprises a combustor assembly, a main combustion chamber and a main heat exchange smoke pipe; the combustor assembly is installed in an inner cavity of the inner container barrel, the combustor assembly is wrapped with the main combustion chamber, and the lower end of the main heat exchange smoke pipe communicates with the upper portion of the main combustion chamber. The main combustion chamber is installed on the side wall of the lower portion of the inner container barrel and wraps the combustor assembly. The main combustion chamber is of a cylindrical structure, a side wall port penetrates through the side wall of the lower portion of the inner container barrel, and the inner diameter of the main combustion chamber is larger than the pipe diameter of the main heat exchange smoke pipe. By optimizing the combustion and heat exchange system, uniform distribution of heat is ensured, the problem of non-uniform water temperature is avoided, and the user experience is improved. And through the cylindrical structure of the main body combustion chamber, the pressure resistance is enhanced, the durability of equipment is improved, and the combustor assembly is convenient to install and maintain.

Description

Technical Field

[0001] This application relates to the field of water heater technology, specifically a condensing gas-fired storage water heater. Background Technology

[0002] Gas water heaters use gas as an energy source and heat water through the heat generated by the combustion of gas to achieve the required water temperature for domestic use, heating, production processes, etc. Storage water heaters refer to water heaters that have a container for hot water inside and are part of the overall water heater system.

[0003] Traditional gas-fired storage water heaters are primarily top-fired, meaning the burner is located above the water heater. The heat generated by combustion is transferred to the water through a heat exchanger. Specifically, the water flows through the heat exchanged with the combustion gases, thus heating the water. The material and shape of the heat exchanger significantly affect thermal efficiency and heating speed. Top-fired water heaters typically employ a forced draft system, using a built-in exhaust fan to vent combustion exhaust gases outdoors.

[0004] However, in top-fired water heaters, when high water usage occurs, the burner only heats the water at the top of the heater, leading to uneven water temperature. Furthermore, the high position of the burner hinders the emission of combustion gases and the full utilization of heat, resulting in lower combustion efficiency. This not only increases energy consumption but may also affect the heating speed and performance of the water heater. Utility Model Content

[0005] To address the problems of uneven water temperature, low combustion efficiency, and high energy consumption in the aforementioned top-fired water heaters under heavy water usage, this application provides a condensing gas-fired storage water heater, comprising: an outer shell assembly, an inner tank water storage container, and a combustion and heat exchange system.

[0006] The outer shell assembly includes: a volumetric water heater shell and an inner tank insulation layer; the inner tank water storage container includes: an inner tank cylinder, an upper cover end cap, and a lower cover end cap.

[0007] The outer shell covers the outside of the inner liner, the inner liner insulation layer fills the space between the outer shell and the inner liner, and the top and bottom of the inner liner are respectively sealed to the upper cover and the lower cover.

[0008] The combustion and heat exchange system includes: a burner assembly, a main combustion chamber, and a main heat exchange flue;

[0009] The burner assembly is installed in the inner cavity of the inner cylinder, and is installed on the lower side wall of the inner cylinder and wrapped around the outside of the burner assembly. The upper end of the main heat exchange flue passes through the upper cover head, and the lower end of the main heat exchange flue is connected to the upper part of the main combustion chamber.

[0010] The main combustion chamber has a cylindrical structure, and the side wall port of the main combustion chamber penetrates the lower side wall of the inner liner. The inner diameter of the main combustion chamber is larger than the diameter of the main heat exchange flue.

[0011] In one feasible implementation, the combustion and heat exchange system further includes: a secondary heat exchange flue;

[0012] The upper end of the secondary heat exchange flue is connected to the main heat exchange flue through the upper connecting flue chamber, and the lower end of the secondary heat exchange flue passes through the lower cover end cap.

[0013] The secondary heat exchange flue consists of multiple parallel straight pipes symmetrically distributed around the main heat exchange flue, with the axis of the main heat exchange flue being parallel to the axis of the secondary heat exchange flue.

[0014] In one feasible implementation, the upper connecting flue is a sealed cavity, fixedly installed on the top of the upper cover head, and the upper port of the main heat exchange flue and the upper port of the secondary heat exchange flue are both connected to the interior of the upper connecting flue.

[0015] One feasible implementation also includes: a condensation treatment system;

[0016] The condensation treatment system includes a bottom condensate collection tank and a condensate exhaust pipe interface;

[0017] The bottom condensate collection trough is fixed to the bottom of the lower cover head and is connected to the lower end of the secondary heat exchange flue. The condensate exhaust pipe interface is connected to the outlet end of the bottom condensate collection trough.

[0018] In one feasible implementation, the bottom condensate collection trough is an annular trough and is arranged around the bottom edge of the lower cover head. The bottom of the bottom condensate collection trough is provided with an inclined guide surface, and the lowest point of the guide surface is connected to the condensate exhaust pipe interface of the bottom condensate collection trough.

[0019] In one feasible implementation, the inner water storage container further includes: an inlet pipe and an outlet pipe;

[0020] The water inlet pipe is connected to the lower part of the inner cavity of the inner liner, and the water outlet pipe is connected to the upper part of the inner cavity of the inner liner;

[0021] Both the inlet pipe and the outlet pipe are connected to the inner cavity of the inner liner.

[0022] In one feasible implementation, the inner water storage container further includes: a drain pipe and a pressure relief pipe;

[0023] The drain pipe and pressure relief pipe are located on the inner liner, on the side opposite to the inlet pipe and outlet pipe;

[0024] The outlet end of the sewage pipe is located in the lower part of the inner cavity of the inner liner and close to the lowest point of the inner wall of the lower cover head; the outlet end of the pressure relief water pipe is located in the upper part of the inner cavity of the inner liner.

[0025] Both the drain pipe and the pressure relief pipe are connected to the inner cavity of the inner liner.

[0026] In one feasible implementation, the flame outlet end of the burner assembly is sealed to the side wall port of the main combustion chamber via a flange connection structure.

[0027] In one feasible implementation, the wall thickness of the main heat exchange flue and the secondary heat exchange flue is 2-5 mm, and the outer surface of the main heat exchange flue and the secondary heat exchange flue are provided with spiral heat exchange fins.

[0028] In one feasible implementation, the inner liner insulation layer is an aluminum silicate fiber cotton layer with a thickness of 30-50mm, and the outer surface is covered with a metal foil reflective layer.

[0029] As described above, this application provides a condensing gas-fired storage water heater. By optimizing the combustion and heat exchange system, it ensures uniform heat distribution, avoids uneven water temperature, and improves user experience. Simultaneously, the use of a main and secondary flue pipe series design and a condensation treatment system enables two-stage heat exchange of the flue gas, significantly improving thermal efficiency and standardizing the treatment of condensate and flue gas, reducing environmental pollution. Furthermore, the combustion chamber has a cylindrical structure to enhance pressure resistance and improve equipment durability; a flange connection structure ensures sealing, prevents gas leakage, and improves safety; and high-efficiency insulation materials are used to reduce heat loss and improve insulation performance. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the embodiments of the present invention. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0031] Figure 1 This is a schematic diagram of the structure of a condensing gas-fired storage water heater, which is an exemplary embodiment of this application.

[0032] Explanation of icon numbers:

[0033] 1-Outer shell of storage water heater; 2-Inner tank insulation layer; 3-Burner assembly; 4-Upper connecting flue chamber; 5-Bottom condensate collection trough; 6-Condensate exhaust pipe interface; 7-Upper cover end cap; 8-Inner tank cylinder; 9-Outlet pipe; 10-Inlet pipe; 11-Lower cover end cap; 12-Drain pipe; 13-Pressure relief water pipe; 14-Main combustion chamber; 15-Main heat exchange flue pipe; 16-Secondary heat exchange flue pipe. Detailed Implementation

[0034] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a full understanding of the implementation of embodiments of the present invention.

[0035] Traditional gas-fired storage water heaters mostly employ a top-fired design, where the burner is located above the water heater. The heat generated by combustion is transferred to the water through a heat exchanger; specifically, the water flows and exchanges heat with the combustion gases to achieve heating. The material and shape of the heat exchanger significantly impact thermal efficiency and heating speed in this process. Furthermore, top-fired water heaters typically use a forced draft system, utilizing a built-in exhaust fan to expel combustion exhaust gases outdoors. However, under heavy water usage, top-fired water heaters suffer from uneven water temperature distribution, and the high burner position hinders the smooth discharge of combustion exhaust gases and the full utilization of heat, resulting in lower combustion efficiency. This not only increases energy consumption but may also affect the heating speed and overall performance of the water heater.

[0036] To address the aforementioned problems, this application provides a condensing gas-fired storage water heater, as described above. Figure 1 As shown, it includes: an outer shell assembly, an inner water storage container, a combustion and heat exchange system, and a condensation treatment system.

[0037] The outer casing assembly includes a storage-type water heater outer casing 1 and an inner tank insulation layer 2. The storage-type water heater outer casing 1, as the outermost protective structure, covers the outside of the inner tank 8, protecting the internal components and maintaining the overall airtightness of the water heater. The inner tank insulation layer 2 fills the space between the storage-type water heater outer casing 1 and the inner tank 8 to reduce heat loss and improve the thermal efficiency of the water heater.

[0038] The inner tank water storage container includes: an inner tank cylinder 8, an upper cover end cap 7, and a lower cover end cap 11. The inner tank cylinder 8 serves as a water storage container, with its top and bottom sealed to the upper cover end cap 7 and the lower cover end cap 11, respectively, to ensure the airtightness of the inner tank and prevent hot water leakage.

[0039] The combustion and heat exchange system includes: burner assembly 3, main combustion chamber 14 and main heat exchange flue 15.

[0040] Specifically, the burner assembly 3 is installed inside the inner liner 8 and is responsible for the combustion of the gas. The main combustion chamber 14 is installed on the lower side wall of the inner liner 8 and is wrapped around the outside of the burner assembly 3. Its side wall port penetrates the lower side wall of the inner liner 8 so that the flame outlet end of the burner assembly 3 is sealed to the side wall port of the main combustion chamber 14 through a flange connection structure. The upper end of the main heat exchange flue duct 15 passes through the upper cover head 7, and the lower end connects to the upper part of the main combustion chamber 14, guiding the high-temperature flue gas to flow upward and transferring heat to the water in the inner liner through the duct wall, completing one heat exchange.

[0041] The main combustion chamber 14 is a cylindrical structure, installed on the lower side wall of the inner liner 8, and enclosed outside the burner assembly 3. Its side wall port penetrates the lower side wall of the inner liner 8, allowing for a sealed connection between the flame outlet end of the burner assembly 3 and the side wall port of the main combustion chamber 14. The inner diameter of the main combustion chamber 14 is larger than the diameter of the main heat exchange flue duct 15, ensuring that high-temperature flue gas smoothly enters the main heat exchange flue duct 15 from the main combustion chamber 14.

[0042] The main combustion chamber 14 provides space for gas combustion and guides the high-temperature flue gas to the main heat exchange flue 15. Its cylindrical structure helps to enhance pressure resistance, while the larger inner diameter increases the main heat exchange area and improves heat exchange efficiency.

[0043] When the burner assembly 3 ignites the gas, a high-temperature flame and flue gas are generated in the main combustion chamber 14. Since the inner diameter of the main combustion chamber 14 is larger than the diameter of the main heat exchange flue 15, the high-temperature flue gas can smoothly enter the main heat exchange flue 15 from the main combustion chamber 14, flow upward and transfer heat to the water in the inner tank through the pipe wall, completing one heat exchange.

[0044] This embodiment increases the inner diameter of the main combustion chamber 14, reducing the resistance to flue gas flow and increasing the flue gas flow velocity, thereby enhancing the heat exchange effect. Simultaneously, the cylindrical structure helps enhance pressure resistance and improve equipment durability, and the increased main heat exchange area helps improve heat exchange efficiency. It also facilitates the installation and maintenance of the burner assembly 3 within the main combustion chamber 14.

[0045] When the water heater is working, the burner assembly 3 ignites the gas, generating a high-temperature flame in the main combustion chamber 14, which directly heats the water stored in the lower part of the inner tank. At the same time, the high-temperature flue gas enters the main heat exchange flue 15 from the main combustion chamber 14, flows upward and transfers heat to the water in the inner tank through the pipe wall, completing one heat exchange cycle.

[0046] In this embodiment, the burner assembly 3 is installed inside the inner tank 8, and the main combustion chamber 14 is wrapped around the burner assembly 3. A main heat exchange flue is provided to guide the high-temperature flue gas upward. This allows heat to be evenly distributed throughout the inner tank 8, optimizing the heat exchange system. The main heat exchange flue guides the high-temperature flue gas upward, and the heat is transferred to the water in the inner tank through the pipe wall. At the same time, the inner diameter of the main combustion chamber 14 is increased to improve the heat exchange area. The condensing gas-fired storage water heater provided in this embodiment can avoid localized overheating or undercooling of the water outlet, ensuring uniform water temperature distribution even under heavy water usage, thus improving the user experience.

[0047] In some embodiments of this application, the combustion and heat exchange system further includes a secondary heat exchange flue 16. The upper end of the secondary heat exchange flue 16 is connected to the main heat exchange flue 15 through the upper connecting flue chamber 4, and the lower end passes through the lower cover 11. In the secondary heat exchange flue 16, the flue gas flows downward and further exchanges heat with the cold water in the inner liner to complete the secondary heat exchange.

[0048] The secondary heat exchange flue 16 consists of multiple parallel straight pipes symmetrically distributed around the main heat exchange flue 15. The axis of the main heat exchange flue 15 is parallel to the axis of the secondary heat exchange flue 16.

[0049] During the operation of the water heater, after completing the first heat exchange, the flue gas enters the upper connecting flue chamber 4 and then enters the secondary heat exchange flue pipe 16. The flue gas flows downwards in the secondary heat exchange flue pipe 16 and further exchanges heat with the cold water in the inner tank, completing the secondary heat exchange. Multiple parallel secondary heat exchange flue pipes 16 are symmetrically distributed around the main heat exchange flue pipe 15, increasing the contact area between the flue gas and the water in the inner tank and improving the efficiency of the secondary heat exchange.

[0050] This embodiment utilizes a design with multiple parallel secondary heat exchange flue tubes 16 symmetrically distributed around the main heat exchange flue tube 15, increasing the contact area between the flue gas and the water in the inner tank and improving heat transfer efficiency. Simultaneously, the downward flow of the flue gas within the secondary heat exchange flue tubes 16 helps to further reduce the flue gas temperature, achieving condensation heat exchange and facilitating the collection and discharge of condensate.

[0051] This embodiment uses the burner assembly 3 to burn fuel gas, generating a high-temperature flame and flue gas. Heat is transferred to the water in the inner tank via the main heat exchange flue 15 and the secondary heat exchange flue 16, achieving heat exchange. Simultaneously, in the secondary heat exchange flue 16, the flue gas temperature drops below the dew point, causing water vapor in the flue gas to condense into liquid water, achieving condensation heat exchange. This solves the problems of low thermal efficiency and improper flue gas treatment in traditional water heaters. The series design of the main and secondary flue pipes achieves two-stage heat exchange for the flue gas, improving thermal efficiency; the condensation treatment system properly treats condensate and flue gas, effectively reducing environmental pollution.

[0052] In some embodiments of this application, the upper connecting flue gas chamber 4 is a sealed cavity, fixedly installed on the top of the upper cover head 7. The upper ports of the main heat exchange flue pipe 15 and the secondary heat exchange flue pipe 16 are both connected to the interior of the upper connecting flue gas chamber 4. The upper connecting flue gas chamber 4 is responsible for guiding the flue gas in the main heat exchange flue pipe 15 into the secondary heat exchange flue pipe 16, forming a flue gas recirculation.

[0053] The upper connecting flue gas chamber 4 can pass the flue gas in the main heat exchange flue 15 to the secondary heat exchange flue 16, ensuring the uniform flow of flue gas in the secondary heat exchange flue 16 and improving the efficiency of secondary heat exchange.

[0054] When the high-temperature flue gas enters the upper connecting flue chamber 4 from the main heat exchange flue 15, the upper connecting flue chamber 4 passes the flue gas into the secondary heat exchange flue 16. The flue gas flows downward in the secondary heat exchange flue 16 and further exchanges heat with the cold water in the inner tank, completing the secondary heat exchange.

[0055] This embodiment, through the design of the upper-connected flue chamber 4, solves the problem of low secondary heat exchange efficiency caused by uneven flue gas distribution in traditional water heaters. It ensures uniform flow of flue gas in the secondary heat exchange flue tube 16, increases the contact area between the flue gas and the water in the inner tank, and improves heat transfer efficiency. At the same time, the downward flow of flue gas in the secondary heat exchange flue tube 16 helps to further reduce the flue gas temperature, achieving condensation heat exchange.

[0056] In some embodiments of this application, a condensation treatment system is also included. The condensation treatment system includes a bottom condensate collection tank 5 and a condensate exhaust pipe interface 6. The bottom condensate collection tank 5 is fixed to the bottom of the lower cover head 11 and is connected to the lower end of the secondary heat exchange flue 16, used to collect the condensate generated in the secondary heat exchange flue 16. The condensate exhaust pipe interface 6 is connected to the outlet end of the bottom condensate collection tank 5, responsible for discharging the collected condensate and cooled flue gas to an external pipeline.

[0057] During the secondary heat exchange process, water vapor in the flue gas condenses into liquid water and flows along the inner wall of the secondary heat exchange flue tube 16 into the bottom condensate collection tank 5. Finally, the condensate collected in the bottom condensate collection tank 5 is discharged to the external pipeline through the condensate exhaust pipe interface 6, while the cooled flue gas is discharged together with the condensate from the condensate exhaust pipe interface 6. The lower end of the secondary heat exchange flue tube 16 passes through the lower cover end cap 11 and is connected to the bottom condensate collection tank 5, facilitating the collection and discharge of condensate.

[0058] Specifically, the flue gas flows downwards in the secondary heat exchange flue tube 16 and further exchanges heat with the cold water in the inner tank, completing the secondary heat exchange. During the secondary heat exchange process, the flue gas temperature drops below the dew point, and the water vapor in the flue gas condenses into liquid water, which flows along the inner wall of the secondary heat exchange flue tube 16 into the bottom condensate collection tank 5. Finally, the condensate collected in the bottom condensate collection tank 5 is discharged to the external pipeline through the condensate exhaust pipe interface 6.

[0059] In some embodiments of this application, the bottom condensate collection trough 5 is an annular trough and is arranged around the bottom edge of the lower cover head 11. The bottom of the bottom condensate collection trough 5 is provided with an inclined guide surface, and the lowest point of the guide surface is connected to the condensate exhaust pipe interface 6 of the bottom condensate collection trough 5. The bottom condensate collection trough 5 is fixed to the bottom of the lower cover head 11 and is connected to the lower end of the secondary heat exchange flue pipe 16.

[0060] The bottom condensate collection trough 5 serves as a condensate collection structure, facilitating the collection of condensate generated in the secondary heat exchange flue tube 16. The inclined guide surface at the bottom of the trough helps guide the condensate to the condensate exhaust pipe interface 6, facilitating the discharge of the condensate.

[0061] During the secondary heat exchange process, water vapor in the flue gas condenses into liquid water and flows along the inner wall of the secondary heat exchange flue duct 16 into the bottom condensate collection tank 5. The annular shape of the bottom condensate collection tank 5 facilitates the collection of condensate, while the inclined guide surface at the bottom of the tank directs the condensate to the condensate exhaust pipe interface 6. Finally, the condensate exhaust pipe interface 6 discharges the collected condensate and the cooled flue gas into the external pipeline.

[0062] This embodiment solves the problems of inconvenient condensate collection and poor drainage in traditional water heaters through the design of an annular groove and an inclined guide surface. The annular groove of the bottom condensate collection groove 5 facilitates the collection of condensate, while the inclined guide surface helps to guide the condensate to the condensate exhaust pipe interface 6, improving the condensate drainage efficiency and optimizing the condensate flow path.

[0063] In some embodiments of this application, the inlet pipe 10 is connected to the lower part of the inner cavity of the inner tank 8, and the outlet pipe 9 is connected to the upper part of the inner cavity of the inner tank 8. Both the inlet pipe 10 and the outlet pipe 9 communicate with the inner cavity of the inner tank 8 and are used to inject cold water and output heated hot water, respectively.

[0064] Understandably, the inlet pipe 10 serves as a cold water injection structure, connected to the lower part of the inner cavity of the inner tank 8, facilitating the injection of cold water and its mixing with the hot water in the inner tank. The outlet pipe 9 serves as a hot water output structure, connected to the upper part of the inner cavity of the inner tank 8, facilitating the output of heated hot water.

[0065] When the water heater is working, cold water is injected into the lower part of the inner tank 8 through the inlet pipe 10, where it mixes with the hot water in the inner tank 8. The burner assembly 3 ignites the gas, generating a high-temperature flame and flue gas in the main combustion chamber 14. The heat is transferred to the water in the inner tank through the main heat exchange flue pipe 15 and the secondary heat exchange flue pipe 16, and the heated hot water is output through the outlet pipe 9.

[0066] In this embodiment, cold water is injected into the lower part of the inner cavity of the inner tank 8 through the inlet pipe 10 and the outlet pipe 9. There, it undergoes thermal convection with the hot water in the inner tank, gradually increasing its temperature. The heated hot water rises due to its reduced density and is output through the outlet pipe 9, facilitating the injection of cold water and its mixing with the hot water in the inner tank. Through the principle of thermal convection, the cold water and the hot water in the inner tank are thoroughly mixed, improving thermal efficiency.

[0067] In some embodiments of this application, the drain pipe 12 and the pressure relief pipe 13 are located on the inner liner 8 on the side opposite to the inlet pipe 10 and the outlet pipe 9.

[0068] The outlet end of the drain pipe 12 is located at the lower part of the inner cavity of the inner tank 8, close to the lowest point of the inner wall of the lower cover 11, facilitating the cleaning of any impurities or dirt that may accumulate at the bottom of the inner tank. The outlet end of the pressure relief pipe 13 is located at the upper part of the inner cavity of the inner tank 8, used to prevent excessive pressure inside the inner tank and ensure the safe operation of the water heater. Both the drain pipe 12 and the pressure relief pipe 13 are connected to the inner cavity of the inner tank 8.

[0069] In actual use, after prolonged use, impurities or dirt may accumulate at the bottom of the inner tank 8. These impurities or dirt can be cleaned through the drain pipe 12, keeping the inner tank 8 clean. Simultaneously, when the internal pressure of the inner tank 8 is too high, the pressure relief pipe 13 can discharge some hot water, reducing the internal pressure of the inner tank 8, ensuring the safe operation of the water heater, and extending the service life of the equipment.

[0070] In some embodiments of this application, the burner assembly 3 is installed inside the inner liner 8, and its flame outlet end is sealed to the side wall port of the main combustion chamber 14 via a flange connection structure. The main combustion chamber 14 is installed on the lower side wall of the inner liner 8 and is wrapped around the outside of the burner assembly 3.

[0071] The burner assembly 3 is used for the combustion of gas. The main combustion chamber 14 is the external enclosure structure of the burner assembly 3, which provides space for the combustion of gas and guides the high-temperature flue gas to the main heat exchange flue duct 15.

[0072] When the burner assembly 3 ignites the gas, a high-temperature flame and flue gas are generated in the main combustion chamber 14. Because the flame outlet end of the burner assembly 3 is sealed to the side wall port of the main combustion chamber 14 via a flange connection structure, the sealing and safety of combustion are ensured. The high-temperature flue gas enters the main heat exchange flue duct 15 from the main combustion chamber 14, flows upward, and transfers heat to the water in the inner tank through the duct wall, completing one heat exchange cycle.

[0073] This embodiment uses a flange connection structure to ensure a tight seal between the burner assembly 3 and the main combustion chamber 14, preventing gas leakage and flue gas spillage. This improved sealing enhances the safety of the water heater, avoiding safety accidents caused by gas leaks. Simultaneously, the main combustion chamber 14 provides the space for gas combustion, ensuring complete combustion of the gas.

[0074] In some embodiments of this application, the wall thickness of the main heat exchange flue 15 and the secondary heat exchange flue 16 is 2-5 mm, and the outer surface of both the main heat exchange flue 15 and the secondary heat exchange flue 16 is provided with spiral heat exchange fins. The main heat exchange flue 15 and the secondary heat exchange flue 16 transfer heat to the water in the inner tank through the pipe wall. Therefore, a wall thickness of 2-5 mm ensures rapid heat transfer while maintaining structural stability and robustness. At the same time, the spiral heat exchange fins on the outer surface of the pipe increase the heat exchange area and improve the heat exchange efficiency.

[0075] The upper end of the main heat exchange flue 15 passes through the upper cover end cap 7, and the lower end connects to the upper part of the main combustion chamber 14. The upper end of the secondary heat exchange flue 16 is connected to the main heat exchange flue 15 through the upper connecting flue chamber 4, and the lower end passes through the lower cover end cap 11. This allows the high-temperature flue gas to enter the main heat exchange flue 15 from the main combustion chamber 14, flow upward, and transfer heat to the water in the inner liner through the pipe wall, completing the first heat exchange. Subsequently, the flue gas enters the upper connecting flue chamber 4 and is evenly distributed into multiple secondary heat exchange flue 16s. The flue gas flows downward in the secondary heat exchange flue 16s and further exchanges heat with the cold water in the inner liner, completing the second heat exchange. During the heat exchange process, the spiral heat exchange fins increase the contact area between the flue gas and the water in the inner liner, improving the heat exchange efficiency.

[0076] In some embodiments of this application, the inner tank insulation layer 2 is an aluminum silicate fiber cotton layer with a thickness of 30-50mm, and its outer surface is covered with a metal foil reflective layer. The inner tank insulation layer 2 fills the space between the outer shell 1 and the inner tank 8 of the volumetric water heater, and its main function is to reduce heat loss and improve the thermal efficiency of the water heater.

[0077] The inner tank insulation layer 2 is filled between the outer shell 1 and the inner tank 8 of the storage water heater, which can reduce heat loss and improve the thermal efficiency of the water heater. The aluminum silicate fiber cotton layer has good heat insulation performance, while the metal foil reflective layer can reflect heat, further reducing heat loss.

[0078] As described in the above embodiments, when the condensing gas-fired storage water heater of this application is working, cold water is injected into the lower part of the inner cavity of the inner tank through the inlet pipe, mixing with the hot water in the inner tank. The burner assembly ignites the gas, generating a high-temperature flame and flue gas in the main combustion chamber. The high-temperature flue gas enters the main heat exchange flue from the main combustion chamber, flows upward, and transfers heat to the water in the inner tank through the pipe wall, completing the first heat exchange. Subsequently, the flue gas enters the upper connecting flue chamber and is evenly distributed into multiple secondary heat exchange flue tubes. The flue gas flows downward in the secondary heat exchange flue tubes and further exchanges heat with the cold water in the inner tank, completing the second heat exchange. During the second heat exchange process, the water vapor in the flue gas condenses into liquid water and flows along the inner wall of the secondary heat exchange flue tubes into the bottom condensate collection tank. Finally, the condensate collected in the bottom condensate collection tank 5 is discharged to the external pipe through the condensate exhaust pipe interface, while the cooled flue gas is discharged together with the condensate from the condensate exhaust pipe interface.

[0079] This application discloses a condensing gas-fired storage water heater. Through a series design of primary and secondary flue pipes, and by optimizing the combustion and heat exchange system, it ensures uniform heat distribution, avoids uneven water temperature, and improves the user experience. Simultaneously, the series design of primary and secondary flue pipes and the condensation treatment system achieve two heat exchanges for the flue gas, significantly improving thermal efficiency and standardizing the treatment of condensate and flue gas, reducing environmental pollution. Furthermore, the combustion chamber is cylindrical to enhance pressure resistance and improve equipment durability; a flange connection structure ensures sealing, prevents gas leakage, and improves safety; and high-efficiency insulation materials are used to reduce heat loss and improve insulation performance.

[0080] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the structure, article, or apparatus that includes the element.

[0081] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

Claims

1. A condensing gas-fired storage water heater, characterized in that, include: The outer shell assembly, the inner water storage container, and the combustion and heat exchange system; The outer shell assembly includes: a volumetric water heater shell (1) and an inner tank insulation layer (2). The inner tank water storage container includes: an inner tank cylinder (8), an upper cover end cap (7), and a lower cover end cap (11). The outer shell (1) covers the outside of the inner liner (8), the inner liner insulation layer (2) fills the space between the outer shell (1) and the inner liner (8), and the top and bottom of the inner liner (8) are respectively sealed to the upper cover end cap (7) and the lower cover end cap (11). The combustion and heat exchange system includes: a burner assembly (3), a main combustion chamber (14), and a main heat exchange flue (15); The burner assembly (3) is installed in the inner cavity of the inner cylinder (8), and is installed on the lower side wall of the inner cylinder (8) and wrapped around the outside of the burner assembly (3). The upper end of the main heat exchange flue (15) passes through the upper cover head (7), and the lower end of the main heat exchange flue (15) is connected to the upper part of the main combustion chamber (14). The main combustion chamber (14) has a cylindrical structure. The side wall port of the main combustion chamber (14) penetrates the lower side wall of the inner liner (8), and the inner diameter of the main combustion chamber (14) is larger than the diameter of the main heat exchange flue (15).

2. The condensing gas-fired storage water heater according to claim 1, characterized in that, The combustion and heat exchange system further includes: a secondary heat exchange flue (16); The upper end of the secondary heat exchange flue (16) is connected to the main heat exchange flue (15) through the upper connecting flue chamber (4), and the lower end of the secondary heat exchange flue (16) passes through the lower cover head (11). The secondary heat exchange flue (16) consists of multiple parallel straight pipes symmetrically distributed around the main heat exchange flue (15), with the axis of the main heat exchange flue (15) being parallel to the axis of the secondary heat exchange flue (16).

3. The condensing gas-fired storage water heater according to claim 2, characterized in that, The upper connecting smoke chamber (4) is a sealed cavity, which is fixedly installed on the top of the upper cover head (7). The upper port of the main heat exchange smoke pipe (15) and the upper port of the secondary heat exchange smoke pipe (16) are both connected to the interior of the upper connecting smoke chamber (4).

4. The condensing gas-fired storage water heater according to claim 2, characterized in that, Also includes: Condensation treatment system; The condensation treatment system includes a bottom condensate collection tank (5) and a condensate exhaust pipe interface (6); The bottom condensate collection trough (5) is fixed to the bottom of the lower cover head (11) and is connected to the lower end of the secondary heat exchange flue (16). The condensate exhaust pipe interface (6) is connected to the outlet end of the bottom condensate collection trough (5).

5. The condensing gas-fired storage water heater according to claim 4, characterized in that, The bottom condensate collection trough (5) is an annular trough and is arranged around the bottom edge of the lower cover head (11). The bottom of the bottom condensate collection trough (5) is provided with an inclined guide surface, and the lowest point of the guide surface is connected to the condensate exhaust pipe interface (6) of the bottom condensate collection trough (5).

6. The condensing gas-fired storage water heater according to claim 1, characterized in that, The inner liner water storage container also includes: an inlet pipe (10) and an outlet pipe (9); The inlet pipe (10) is connected to the lower part of the inner cavity of the inner liner (8), and the outlet pipe (9) is connected to the upper part of the inner cavity of the inner liner (8). Both the inlet pipe (10) and the outlet pipe (9) are connected to the inner cavity of the inner liner (8).

7. The condensing gas-fired storage water heater according to claim 6, characterized in that, The inner tank water storage container also includes: a drain pipe (12) and a pressure relief pipe (13); The drain pipe (12) and the pressure relief pipe (13) are located on the inner liner (8) on the side opposite to the inlet pipe (10) and the outlet pipe (9); The outlet end of the drain pipe (12) is located in the lower part of the inner cavity of the inner liner (8) and close to the lowest point of the inner wall of the lower cover head (11), while the outlet end of the pressure relief pipe (13) is located in the upper part of the inner cavity of the inner liner (8). The drain pipe (12) and the pressure relief pipe (13) are both connected to the inner cavity of the inner liner (8).

8. The condensing gas-fired storage water heater according to claim 1, characterized in that, The flame outlet end of the burner assembly (3) is sealed to the side wall port of the main combustion chamber (14) via a flange connection structure.

9. The condensing gas-fired storage water heater according to claim 2, characterized in that, The wall thickness of the main heat exchange flue (15) and the secondary heat exchange flue (16) is 2-5 mm, and the outer surface of the main heat exchange flue (15) and the secondary heat exchange flue (16) are provided with spiral heat exchange fins.

10. The condensing gas-fired storage water heater according to claim 1, characterized in that, The inner liner insulation layer (2) is an aluminum silicate fiber cotton layer with a thickness of 30-50mm and an outer surface covered with a metal foil reflective layer.

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