Full-premixing down-burning burner and condensing gas volumetric water heater

Abstract

The invention provides a full-premixing lower combustion type combustor and a gas volumetric water heater. The full-premixing lower combustion type combustor comprises a combustion head assembly, a premixing box assembly and a hopper-shaped flow dividing cover. The combustion head assembly comprises an outer side fire hole, an inner side fire hole and a top end sealing plate, and at least one of the outer side fire hole and the inner side fire hole is provided with a fire hole; a premixing channel and a secondary air volume channel are formed in the premixing box assembly, and a fire hole premixing cavity is formed between the combustion head assembly and the premixing box assembly; the upper end of the hopper-shaped shunting cover is connected with the lower end of the inner side fire hole, and the lower end of the hopper-shaped shunting cover is communicated with the secondary air volume channel. According to the full-premixing down-combustion type combustor and the gas volumetric water heater, efficient premixing, sufficient combustion and low-nitrogen emission of gas and air are achieved through the structures such as the combustion head assembly, the premixing box assembly and the hopper-shaped flow dividing cover. The problem that sundries and condensate water fall on the upper portion of a combustion chamber of a traditional combustor disturb combustion flames is solved, and efficient combustion and low-nitrogen emission of the water heater are further achieved.

Description

Technical Field

[0001] The present application relates to the technical field of water heaters, and particularly to a fully premixed down-fired burner and a condensing gas volumetric water heater. Background Art

[0002] A gas water heater uses gas as an energy source, heats water by the heat generated from gas combustion, and enables the water temperature to meet the requirements of life, heating, production processes, etc. A volumetric gas water heater refers to a water heater with a hot water container inside and as a part of the whole water heater.

[0003] Traditional burners mainly consist of a nozzle, a mixing chamber, an ignition device and a combustion chamber. The technical core is the mixing and combustion method of gas and air. In the early stage, diffusion combustion was mostly used. After the gas was ejected from the nozzle, it mixed with air and burned simultaneously, with a longer flame but prone to incomplete combustion products. Later, it developed into premixed combustion, where gas and air were fully premixed in the mixing chamber to achieve more efficient and clean combustion. In terms of materials, the burner body is often made of high-temperature resistant alloys or ceramics to adapt to high-temperature environments.

[0004] However, traditional burners have the problem of insufficient mixing of gas and air, resulting in CO emissions in local fuel-rich areas. At the same time, uneven mixing causes a large temperature gradient of the flame, increasing the generation of thermal NOx. Moreover, the secondary air volume distribution in the inner and outer burner ports of the combustion chamber cannot be dynamically adjusted, and the inability to flexibly switch between the inner and outer combustion modes leads to a decrease in combustion efficiency, poor energy efficiency adaptability, and fluctuations in pollutant emissions. Summary of the Invention

[0005] To solve the problems of insufficient mixing of gas and air, inability to dynamically adjust the secondary air volume distribution in the inner and outer burner ports of the combustion chamber, and inability to flexibly switch between the inner and outer combustion modes, resulting in a decrease in combustion efficiency, poor energy efficiency adaptability, and fluctuations in pollutant emissions, on the one hand, the present application provides a fully premixed down-fired burner, including: a burner head assembly, a premixing box assembly, and a bucket-shaped shunt cover;

[0006] The burner head assembly includes: an outer burner port, an inner burner port, and a top seal plate;

[0007] The outer burner port and the inner burner port are fixedly connected through the top seal plate. The inner and outer edges of the top seal plate respectively extend beyond the sides of the inner burner port and the outer burner port. At least one of the outer burner port and the inner burner port is provided with fire holes;

[0008] The premixing box assembly includes: an upper cover plate, a lower bottom plate, and an inner partition plate;

[0009] The upper cover plate is fixedly connected to the bottom of the burner head assembly. The inner partition plate is arranged on the side of the upper cover plate away from the burner head assembly, and a premixing channel is formed between the inner partition plate and the upper cover plate. The burner head assembly is fixedly connected and communicated with the upper cover plate to form a premixing chamber at the fire port.

[0010] The lower bottom plate is arranged on the side of the inner partition plate away from the upper cover plate, and a secondary air volume channel is formed between the lower bottom plate and the inner partition plate.

[0011] One end of the premixing channel away from the burner head assembly is communicated with a premixing fan, and the premixing fan is used to input gas and air into the premixing channel.

[0012] The bucket-shaped flow dividing cover is a funnel-shaped structure. The upper end of the bucket-shaped flow dividing cover with a larger opening is connected to the lower end of the inner fire port to form an inner combustion chamber at the fire port. The lower end of the bucket-shaped flow dividing cover with a smaller opening is communicated with the secondary air volume channel.

[0013] In a feasible implementation manner, the burner head assembly further includes: an outer flow blocking net, an outer hole reinforcing ring, an inner flow blocking net, and an inner hole reinforcing ring.

[0014] The outer flow blocking net is tightly installed on the inner side of the outer fire port. The inner flow blocking net is tightly installed on the inner side of the inner fire port. The outer hole reinforcing ring surrounds the inner side of the outer flow blocking net and fits with the outer flow blocking net. The inner hole reinforcing ring surrounds the inner side of the inner flow blocking net and fits with the inner flow blocking net.

[0015] The mesh number of the outer flow blocking net and the inner flow blocking net is 30 ± 2 meshes.

[0016] In a feasible implementation manner, the premixing box assembly further includes an adjusting plate.

[0017] The adjusting plate is slidably installed on the lower bottom plate. The height of the part of the adjusting plate exceeding the lower bottom plate is lower than that of the inner partition plate. The adjusting plate is used to adjust the opening size of the secondary air volume channel.

[0018] In a feasible implementation manner, it further includes: the gas valve assembly and the full-premixing system control assembly.

[0019] The gas valve assembly is communicated with the premixing channel through a pipeline, and the gas valve assembly is used to control the input amounts of gas and air.

[0020] The full-premixing system control assembly is electrically connected to the gas valve assembly, the premixing fan, and the adjusting plate.

[0021] The full-premixing system control assembly is used to integrally control the opening degree of the gas valve assembly, the opening and closing of the premixing fan, and the position of the adjusting plate on the lower bottom plate.

[0022] In a feasible implementation manner, the inner and outer edges of the top end sealing plate extend 3 ± 1 mm beyond the sides of the outer and inner flame ports, and form an eaves-shaped shielding structure.

[0023] In a feasible implementation manner, the inclined inner wall of the funnel-shaped flow dividing cover extends to the bottom of the combustion chamber inside the flame port to guide the sundries falling from the combustion chamber to the bottom of the combustion chamber.

[0024] In a feasible implementation manner, the funnel-shaped flow dividing cover is fixedly connected to the lower bottom plate by bolts to seal between the secondary air volume passage and the combustion chamber inside the flame port.

[0025] In a feasible implementation manner, the end of the secondary air volume passage has two branches, which are respectively communicated with the combustion chamber and the combustion chamber inside the flame port.

[0026] In a feasible implementation manner, the area of a single flame hole on the outer and inner flame ports is 3 - 9 mm²; the ratio of the total area of the flame holes on the outer and inner flame ports to the burner power is 145 - 155 mm² / kW.

[0027] On the other hand, the present application provides a condensing gas volumetric water heater, including the fully premixed downward combustion burner described in any one of the above, and further including a housing assembly, an inner tank water storage container, and a condensation treatment system;

[0028] The housing assembly is wrapped outside the inner tank water storage container, the burner is arranged in the inner cavity of the inner tank water storage container, and the condensation treatment system is arranged between the housing assembly and the lower end of the inner tank water storage container.

[0029] As can be seen from the above, the present application provides a fully premixed downward combustion burner and a condensing gas volumetric water heater. The fully premixed downward combustion burner and its related water heater in the present solution realize the efficient premixing, full combustion, and low nitrogen emission of gas and air through the integrated design of structures such as the combustion head assembly, the premixing box assembly, and the funnel-shaped flow dividing cover, and the coordinated work of components such as the gas valve assembly, the premixing fan, and the fully premixed system control assembly. At the same time, through the optimized design of structures such as the top end sealing plate and the funnel-shaped flow dividing cover, the problems of sundries falling from the upper part of the combustion chamber of the traditional burner and the interference of condensed water on the combustion flame are solved. In addition, the integrated design of the condensing gas volumetric water heater enables the water heater to have the advantages of efficient combustion, low nitrogen emission, and convenient condensation water treatment. Description of the Drawings

[0030] The accompanying drawings here are incorporated into and form a part of this specification, showing embodiments in accordance with the present invention, and are used together with the specification to explain the principles of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0031] Figure 1 It is a schematic structural diagram of a fully premixed down-fired burner shown in an exemplary embodiment of the present application;

[0032] Figure 2 It is a schematic diagram of simultaneous combustion of inner and outer flame holes shown in an exemplary embodiment of the present application.

[0033] Explanation of reference numerals in the drawings:

[0034] 1 - top end plate; 2 - outer flame port; 3 - outer flow blocking net; 4 - outer hole reinforcing ring; 5 - flame port premixing chamber; 6 - inner flame port; 7 - inner flow blocking net; 8 - inner hole reinforcing ring; 9 - upper cover plate; 10 - premixing channel; 11 - inner partition board; 12 - gas valve assembly; 13 - fully premixed system control assembly; 14 - premixing fan; 15 - adjusting plate; 16 - lower bottom plate; 17 - secondary air volume channel; 18 - bucket-shaped flow dividing cover; 19 - inner combustion chamber of the flame port. Detailed implementation manners

[0035] Now, the exemplary embodiments will be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; on the contrary, these embodiments are provided so that the embodiments of the present invention will be more comprehensive and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present invention.

[0036] Traditional burners mainly consist of nozzles, mixing chambers, ignition devices, and combustion chambers. The core technology lies in the mixing and combustion method of gas and air. In the early stage, diffusion combustion was mostly adopted. After the gas was ejected from the nozzle, it mixed and burned with air simultaneously. The flame was relatively long but prone to incomplete combustion products. Later, it developed into premixed combustion, where gas and air were fully premixed in the mixing chamber to achieve more efficient and clean combustion. In terms of materials, the main body of the burner is often made of high-temperature-resistant alloys or ceramics to adapt to high-temperature environments. However, traditional burners have the problem of insufficient mixing of gas and air, resulting in CO emissions in local fuel-rich areas. At the same time, uneven mixing causes a large temperature gradient in the flame, increasing the generation of thermal NOx. Moreover, the secondary air volume distribution in the inner and outer burner orifice areas cannot be dynamically adjusted, and the inability to flexibly switch between the inner and outer combustion modes leads to a decrease in combustion efficiency, poor energy efficiency adaptability, and fluctuations in pollutant emissions.

[0037] To solve the above problems, on the one hand, the present application provides a fully premixed downward combustion burner. Referring to Figure 1 as shown, Figure 1 is a schematic structural diagram of the fully premixed downward combustion burner shown in the embodiment of the present application. It includes three main parts: a burner head assembly, a premixing box assembly, and a funnel-shaped flow divider 18.

[0038] Among them, the burner head assembly is located at the top of the burner and includes an outer burner orifice 2, an inner burner orifice 6, and a top end plate 1. The top end plate 1 is horizontally arranged at the uppermost end of the burner head assembly. Its inner and outer edges respectively extend beyond the sides of the outer burner orifice 2 and the inner burner orifice 6, forming an eaves-like shielding structure. Both the outer burner orifice 2 and the inner burner orifice 6 are annular structures. The outer burner orifice 2 is arranged on the outside, and the inner burner orifice 6 is arranged on the inside. The two are fixedly connected through the top end plate 1 to ensure the overall stability of the burner head assembly.

[0039] The premixing box assembly is located below the burner head assembly and includes an upper cover plate 9, a lower bottom plate 16, and an inner partition 11. The upper cover plate 9 is connected and fixed to the bottom of the burner head assembly, playing a role of sealing and supporting. The inner partition 11 is vertically arranged on the side of the upper cover plate 9 away from the burner head assembly, forming a premixing channel 10 between it and the upper cover plate 9. The burner head assembly is fixedly connected through communication with the upper cover plate 9 to form a premixed chamber 5 at the burner orifice for the premixing of gas and air. The lower bottom plate 16 is arranged on the side of the inner partition 11 away from the upper cover plate 9, forming a secondary air volume channel 17 between it and the inner partition 11 for adjusting the secondary air volume entering the combustion chamber.

[0040] The funnel-shaped flow divider 18 is a funnel-shaped structure. Its upper end with a larger opening is connected to the lower end of the inner burner orifice 6 to form an inner combustion chamber 19 at the burner orifice. Its lower end with a smaller opening is connected to the secondary air volume channel 17, playing a role of guiding air flow and shielding debris.

[0041] The burner head assembly and the premixing box assembly are fixedly connected by the upper cover plate 9 to ensure the stability and sealing of the burner head assembly. One end of the premixing channel 10 far from the burner head assembly is communicated with a premixing fan 14. The premixing fan 14 transports gas and air to the premixing channel 10 through a pipeline to achieve the preliminary premixing of gas and air. The premixed gas enters the flame holes of the outer flame port 2 and the inner flame port 6 through the flame port premixing chamber 5 for combustion.

[0042] The setting of the funnel-shaped flow dividing cover 18 enables the gas entering from the premixing channel 10 to be evenly distributed to the flame port premixing chamber 5, and through its funnel-shaped structure, the sundries falling from the combustion chamber are guided to the bottom of the combustion chamber to prevent the sundries from entering the flame port and affecting the combustion effect.

[0043] In this embodiment, through the integrated design of the burner head assembly, the premixing box assembly and the funnel-shaped flow dividing cover 18, problems such as insufficient premixing of gas and air, low combustion efficiency, and easy generation of nitrogen oxides in traditional burners are solved. The settings of the premixing channel 10 and the flame port premixing chamber 5 enable the gas and air to be premixed twice to ensure sufficient premixing and improve the combustion efficiency. The eaves-shaped shielding structure of the top sealing plate 1 effectively prevents the sundries and condensed water falling from the upper part of the combustion chamber from interfering with the combustion flame and ensures the combustion stability. And through the precise control of the premixing fan 14 and the premixing channel 10, the best air-fuel ratio of gas and air is achieved, effectively suppressing the generation of nitrogen oxides and meeting the environmental protection requirements.

[0044] Further, in the embodiment of the present application, at least one of the outer flame port 2 and the inner flame port 6 is provided with a flame hole. Specifically, there are the following three ways to select the flame port combustion structure of the burner head assembly: First, only the outer flame port 2 has a flame hole, and the burner head burns only outside the outer flame port 2; Second, only the inner flame port 6 has a flame hole, and the burner head burns only outside the inner flame port 6; Third, both the outer flame port 2 and the inner flame port 6 have flame holes, and the burner head burns outside both the outer flame port 2 and the inner flame port 6.

[0045] Specifically, when only the outer flame port 2 has a flame hole, the outer flame holes are directly exposed to the mainstream field of the combustion chamber. The flame propagation path is short, and the gas-air mixture can be quickly ignited and form a stable flame, which can be applied to industrial equipment that requires quick ignition or local high-temperature heating; when only the inner flame port 6 has a flame hole, the inner flame holes are close to the central axis of the combustion chamber, the contact area between the flame and the combustion chamber wall is small, and the heat loss is reduced, which can be applied to household gas stoves or laboratory burners with concentrated heat load requirements and enclosed spaces.

[0046] Refer to Figure 2 as shown Figure 2 is a schematic diagram showing the simultaneous combustion of the inner and outer flame holes shown in the embodiment of the present application. When both the outer flame port 2 and the inner flame port 6 have flame holes, the inner and outer flame holes work together, the flame coverage area expands, and the temperature gradient in the combustion chamber decreases.

[0047] In this embodiment, the three types of flame hole design methods achieve a balance among efficiency, stability, and cost by matching different application scenarios. The outer flame hole design emphasizes fast response, the inner flame hole design emphasizes concentrated efficiency, and the double-sided flame hole design provides the optimal overall performance, effectively enhancing the flexibility of the combustion system.

[0048] In some embodiments of the present application, in addition to including the outer flame hole 2, the inner flame hole 6, and the top sealing plate 1, the burner head assembly further includes an outer flow blocking net 3, an outer hole reinforcing ring 4, an inner flow blocking net 7, and an inner hole reinforcing ring 8.

[0049] The outer flow blocking net 3 is installed closely to the inner side of the outer flame hole 2, and the inner flow blocking net 7 is installed closely to the inner side of the inner flame hole 6. The outer hole reinforcing ring 4 surrounds the inner side of the outer flow blocking net 3 and fits with the outer flow blocking net 3; the inner hole reinforcing ring 8 surrounds the inner side of the inner flow blocking net 7 and fits with the inner flow blocking net 7. The mesh number of the outer flow blocking net 3 and the inner flow blocking net 7 is 30 ± 2 meshes, ensuring uniform distribution of the gas flow and stable flame.

[0050] In this embodiment, by providing a flow blocking net and a reinforcing ring on the inner sides of the outer flame hole 2 and the inner flame hole 6, problems such as insufficient structural strength of the flow blocking net of the burner flame hole and uneven distribution of the gas flow caused by the deformation of the flow blocking net are solved. The settings of the outer flow blocking net 3 and the inner flow blocking net 7 enable the gas flow to be evenly distributed inside the flame hole, avoiding too high or too low local gas concentration, improving the combustion efficiency, and stabilizing the flame. Through the flow equalizing effect of the flow blocking net, the gas and air can be fully mixed, improving the combustion efficiency and reducing the emission of nitrogen oxides. The settings of the outer hole reinforcing ring 4 and the inner hole reinforcing ring 8 enhance the structural strength of the outer flow blocking net 3 and the inner flow blocking net 7, ensuring that the outer flow blocking net 3 and the inner flow blocking net 7 respectively fit with the outer flame hole 2 and the inner flame hole 6, and guaranteeing the flow blocking effect.

[0051] In some embodiments of the present application, the premixing box assembly further includes: an adjusting plate 15.

[0052] The adjusting plate 15 is slidably installed on the lower bottom plate 16 and is used to adjust the opening size of the secondary air volume passage 17. The height of the part of the adjusting plate 15 exceeding the lower bottom plate 16 is lower than that of the inner partition plate 11, ensuring that the adjusting plate 15 will not interfere with the inner partition plate 11 during the sliding process.

[0053] By being slidably installed on the lower bottom plate 16, the adjusting plate 15 can manually or automatically adjust its position in the secondary air volume passage 17, thereby changing the opening size of the secondary air volume passage 17. When it is necessary to increase the secondary air volume, the adjusting plate 15 slides away from the inner partition plate 11, increasing the opening of the secondary air volume passage 17; when it is necessary to reduce the secondary air volume, the adjusting plate 15 slides towards the inner partition plate 11, reducing the opening of the secondary air volume passage 17.

[0054] In this embodiment, by arranging the adjusting plate 15 to be slidably mounted on the lower bottom plate 16, the secondary air volume can be quickly adjusted manually or automatically. By adjusting the sliding position of the adjusting plate 15, the opening size of the secondary air volume passage 17 can be precisely controlled, thereby precisely adjusting the secondary air volume to meet different combustion requirements. Further, by adjusting the secondary air volume, the combustion process can be optimized, the combustion efficiency can be improved, and the emission of nitrogen oxides can be reduced.

[0055] In some embodiments of the present application, it further includes: a gas valve assembly 12 and a fully premixed system control assembly 13.

[0056] The gas valve assembly 12 is connected to the premixing passage 10 through a pipeline and is used to control the input amounts of gas and air. The fully premixed system control assembly 13 is electrically connected to the gas valve assembly 12, the premixing fan 14, and the adjusting plate 15, and is used to integrally control the opening degree of the gas valve assembly 12, the opening and closing of the premixing fan 14, and the position of the adjusting plate 15 on the lower bottom plate 16.

[0057] The gas valve assembly 12 is connected to the premixing passage 10 through a pipeline and controls the input amount of gas according to the instruction of the fully premixed system control assembly 13. The premixing fan 14 is connected to the premixing passage 10 through a pipeline and controls the input amount of air according to the instruction of the fully premixed system control assembly 13. The adjusting plate 15 is connected to the fully premixed system control assembly 13 mechanically or electronically and adjusts its position in the secondary air volume passage 17 according to the instruction of the fully premixed system control assembly 13.

[0058] The fully premixed system control assembly 13 realizes the full-automatic control of the burner by integrally controlling the gas valve assembly 12, the premixing fan 14, and the adjusting plate 15. According to the working conditions of the burner and the changes in external conditions, the fully premixed system control assembly 13 can automatically adjust the gas volume, air volume, and secondary air volume to ensure the efficient and stable operation of the burner. The integrated control of the fully premixed system control assembly 13 makes the control of the burner more centralized and convenient, improving the control efficiency and accuracy.

[0059] In some embodiments of the present application, the inner and outer edges of the top end sealing plate 1 extend beyond the sides of the outer burner opening 2 and the inner burner opening 6 by 3 ± 1 mm, forming an eaves-like shielding structure.

[0060] Specifically, a basic excess amount of 3 mm can ensure that the sealing plate forms an effective eaves-like shielding structure, covering the main area of the side of the burner opening, blocking debris (such as carbon deposit particles, metal debris) and condensed water falling from the upper part of the combustion chamber, and preventing them from directly impacting the flame or entering the combustion passage. According to the burner design principle, the gap between the sealing plate and the side of the burner opening needs to balance the shielding effect and air flow. A gap of 3 mm can not only limit the entry of debris but also not significantly hinder the supply of secondary air required for combustion.

[0061] Based on the 3mm size, in extreme working conditions such as frequent coking at the top of the combustion chamber and a large amount of condensate generation, it can be designed to be 4mm. The 4mm excess can expand the shielding area and significantly reduce the probability of foreign matter intrusion. The 2mm size can also be adaptively applied to micro-burners, increasing the flexibility of structural application.

[0062] In some embodiments of the present application, the funnel-shaped shunt cover 18 is a funnel-shaped structure, and its inclined inner wall extends to the bottom of the inner combustion chamber 19 of the fire port to guide the foreign matter falling from the combustion chamber to the bottom of the combustion chamber.

[0063] The upper end of the larger opening of the funnel-shaped shunt cover 18 is connected to the lower end of the inner fire port 6 to form the inner combustion chamber 19 of the fire port, and the lower end of the smaller opening is connected to the secondary air volume passage 17. Its inclined inner wall extends from the top to the bottom of the inner combustion chamber 19 of the fire port to form a guiding structure. When foreign matter falls from the combustion chamber, the foreign matter will slide along the inclined inner wall of the funnel-shaped shunt cover 18 to the bottom of the combustion chamber, and will not enter the inner combustion chamber 19 of the fire port to affect the combustion effect.

[0064] Since the inclined inner wall of the funnel-shaped shunt cover 18 can guide the foreign matter falling from the combustion chamber to the bottom of the combustion chamber, preventing the foreign matter from entering the inner combustion chamber 19 of the fire port and affecting the combustion effect. Therefore, the cleanliness of the inner combustion chamber 19 of the fire port is further maintained, ensuring the full mixing and combustion of gas and air, and improving the combustion efficiency. And since the foreign matter is guided to the bottom of the combustion chamber and will not accumulate in the inner combustion chamber 19 of the fire port, the maintenance frequency of the burner can be reduced.

[0065] In some embodiments of the present application, the funnel-shaped shunt cover 18 and the lower bottom plate 16 are fixedly connected by bolts to ensure the sealing between the secondary air volume passage 17 and the inner combustion chamber 19 of the fire port.

[0066] The lower end of the smaller opening of the funnel-shaped shunt cover 18 is aligned with the corresponding interface provided on the lower bottom plate 16, and then the two are fixedly connected by bolts. This connection method can ensure the sealing between the secondary air volume passage 17 and the inner combustion chamber 19 of the fire port, prevent gas leakage, and improve the combustion efficiency.

[0067] Furthermore, the bolt fixed connection method can also enhance the connection stability between the funnel-shaped shunt cover 18 and the lower bottom plate 16, preventing the connection from loosening due to vibration or impact during use. The bolt fixed connection method also facilitates the disassembly and replacement of the funnel-shaped shunt cover 18 or the lower bottom plate 16, which is convenient for the maintenance and repair of the burner.

[0068] In some embodiments of the present application, the end of the secondary air volume passage 17 has two branches and is respectively connected to the combustion chamber and the inner combustion chamber 19 of the fire port.

[0069] The secondary air volume channel 17 is formed between the lower bottom plate 16 and the inner partition plate 11, and its end is divided into two branches. One branch is connected to the combustion chamber for providing secondary air to the combustion chamber; the other branch is connected to the burner internal combustion chamber 19 for providing secondary air to the burner internal combustion chamber 19. This branch structure can ensure that both the combustion chamber and the burner internal combustion chamber 19 can be adequately supplied with secondary air, thereby improving combustion efficiency.

[0070] In some embodiments of the present application, the area of ​​a single fire hole on the outer burner 2 and the inner burner 6 is 3-9 mm2; the ratio of the total area of ​​the fire holes of the outer burner 2 and the inner burner 6 to the burner power is 145-155 mm2 / kW.

[0071] Multiple fire holes are provided on the outer burner 2 and the inner burner 6, and the area of ​​each fire hole is controlled between 3-9 mm2. According to the power of the burner, the total area of ​​the fire holes of the outer burner 2 and the inner burner 6 is calculated so that the ratio of the total area of ​​the fire holes to the burner power is between 145-155 mm2 / kW. This design can ensure the full mixing and combustion of gas and air, and improve the combustion efficiency.

[0072] Taking a burner with a power of 95kW as an example, calculated at 145mm2 / kW, the total area of ​​fire holes required is 145×95=13775mm2. A single fire hole uses a Φ2.2mm round hole, and its fire hole area is about 3.8mm2, so the number of fire holes is about 3625.

[0073] This embodiment solves the problem of unreasonable design of fire hole area and low combustion efficiency of traditional burners by designing the ratio of fire hole area to burner power. The fire hole area can be reasonably designed according to the power of the burner so that the ratio of the total fire hole area to the burner power is between 145-155mm2 / kW, ensuring sufficient mixing and combustion of gas and air.

[0074] On the other hand, the embodiment of the present application provides a condensing gas volumetric water heater, including a fully premixed bottom-burning burner as described in any one of the above embodiments, and also including a shell assembly, an inner tank water storage container, and a condensation treatment system. The shell assembly is coated on the outside of the inner tank water storage container to play a protective role. The burner is arranged in the inner cavity of the inner tank water storage container, and is used to heat the water in the inner tank water storage container. The condensation treatment system is arranged between the shell assembly and the lower end of the inner tank water storage container, and is used to treat the condensed water generated by combustion.

[0075] The outer shell assembly is connected to the inner tank water storage container through fixing parts to ensure the stability and sealing of the inner tank water storage container. The burner is connected to the gas valve assembly 12 and the premix blower 14 through pipelines to achieve the supply and control of gas and air. The condensation treatment system is connected to the smoke exhaust port of the burner through pipelines to process the condensed water generated by combustion and prevent the condensed water from corroding the burner and the inner tank water storage container.

[0076] In this embodiment, by integrating the fully premixed down-fired burner, the outer shell assembly, the inner tank water storage container and the condensation treatment system, problems such as low combustion efficiency, high nitrogen oxide emissions and inconvenient condensed water treatment of traditional water heaters are solved. Combining with the efficient combustion of the fully premixed down-fired burner, the heating efficiency of the water heater can be improved and the heating time can be shortened. The low nitrogen emission characteristics of the fully premixed down-fired burner can meet the environmental protection requirements and reduce the impact on the environment. The setting of the condensation treatment system can facilitate the treatment of the condensed water generated by combustion, prevent the condensed water from corroding the water heater and extend the service life of the water heater.

[0077] According to the content of the above embodiment, the fully premixed down-fired burner and its related water heater described in this solution achieve the efficient premixing, full combustion and low nitrogen emission of gas and air through the integrated design of structures such as the combustion head assembly, the premix box assembly and the bucket-shaped flow divider cover, as well as the coordinated work of components such as the gas valve assembly, the premix blower and the fully premixed system control assembly. At the same time, through the optimized design of structures such as the top sealing plate and the bucket-shaped flow divider cover, the problems of debris falling in the upper part of the combustion chamber of the traditional burner and the interference of condensed water on the combustion flame are solved. In addition, the integrated design of the condensing gas volumetric water heater makes the water heater have the advantages of efficient combustion, low nitrogen emission and convenient condensed water treatment.

[0078] In terms of the usage process, the user only needs to set the operating parameters of the water heater through the fully premixed system control assembly, and the burner can automatically complete the processes of premixing, combustion and emission of gas and air. At the same time, the user can also adjust the secondary air volume through the adjusting plate according to actual needs to optimize the combustion effect. Generally speaking, the fully premixed down-fired burner and its related water heater described in this solution have the advantages of compact structure, convenient installation, simple maintenance, high efficiency and environmental protection, and have broad application prospects.

[0079] It should be noted that in the embodiments of this application, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a structure, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such structure, article or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the structure, article or device including the elements.

[0080] Other embodiments of the present disclosure will be readily apparent to those skilled in the art in view of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

Claims

1. A fully premixed down-fired burner, characterized in that, Comprising: A burner head assembly, a premixing box assembly and a funnel-shaped flow divider cover (18); The burner head assembly includes: an outer burner port (2), an inner burner port (6), and a top sealing plate (1); The outer burner port (2) is fixedly connected to the inner burner port (6) through the top sealing plate (1). The inner and outer edges of the top sealing plate (1) respectively extend beyond the sides of the inner burner port (6) and the outer burner port (2). At least one of the outer burner port (2) and the inner burner port (6) is provided with burner holes; The premixing box assembly includes: an upper cover plate (9), a lower bottom plate (16), and an inner partition plate (11); The upper cover plate (9) is connected and fixed to the bottom of the burner head assembly. The inner partition plate (11) is arranged on the side of the upper cover plate (9) away from the burner head assembly, and a premixing channel (10) is formed between the inner partition plate (11) and the upper cover plate (9). The burner head assembly is fixedly connected through communication with the upper cover plate (9) to form a burner port premixing cavity (5); The lower bottom plate (16) is arranged on the side of the inner partition plate (11) away from the upper cover plate (9), and a secondary air volume channel (17) is formed between the lower bottom plate (16) and the inner partition plate (11); One end of the premixing channel (10) away from the burner head assembly is communicated with a premixing fan (14), and the premixing fan (14) is used to input gas and air into the premixing channel (10); The funnel-shaped flow divider cover (18) is a funnel-shaped structure. The upper end with a larger opening of the funnel-shaped flow divider cover (18) is connected to the lower end of the inner burner port (6) to form an inner combustion cavity (19) of the burner port. The lower end with a smaller opening of the funnel-shaped flow divider cover (18) is communicated with the secondary air volume channel (17).

2. The all-premixed downward combustion burner according to claim 1, characterized in that, The burner head assembly further includes: an outer flow blocking net (3), an outer hole reinforcing ring (4), an inner flow blocking net (7), and an inner hole reinforcing ring (8); The outer flow blocking net (3) is installed closely to the inner side of the outer burner port (2), and the inner flow blocking net (7) is installed closely to the inner side of the inner burner port (6); The outer hole reinforcing ring (4) surrounds the inner side of the outer flow blocking net (3) and fits with the outer flow blocking net (3); the inner hole reinforcing ring (8) surrounds the inner side of the inner flow blocking net (7) and fits with the inner flow blocking net (7); The mesh number of the outer flow blocking net (3) and the inner flow blocking net (7) is 30 ± 2 meshes.

3. The all-premixed down-fired burner according to claim 1, characterized in that, The premixing box assembly further includes an adjusting plate (15); The adjusting plate (15) is slidably installed on the lower bottom plate (16). The height of the part of the adjusting plate (15) exceeding the lower bottom plate (16) is lower than that of the inner partition plate (11). The adjusting plate (15) is used to adjust the opening size of the secondary air volume channel (17).

4. The premix down-fired burner according to claim 3, characterized in that, Further comprising: The gas valve assembly (12) and the fully premixed system control assembly (13); The gas valve assembly (12) is communicated with the premixing channel (10) through a pipeline, and the gas valve assembly (12) is used to control the input amount of gas and air; The fully premixed system control assembly (13) is electrically connected to the gas valve assembly (12), the premixing fan (14), and the adjusting plate (15); The full-premix system control assembly (13) is used to integrally control the opening degree of the gas valve assembly (12), the opening and closing of the premix blower (14), and the position of the adjusting plate (15) on the lower bottom plate (16).

5. The all-premixed down-fired burner according to claim 1, characterized in that, The inner and outer edges of the top sealing plate (1) extend 3 ± 1 mm beyond the sides of the outer flame port (2) and the inner flame port (6), and form an eaves-like shielding structure.

6. The all-premixed down-fired burner according to claim 1, characterized in that, The inclined inner wall of the funnel-shaped flow divider cover (18) extends to the bottom of the combustion chamber inner cavity (19) of the flame port to guide the sundries dropped from the combustion chamber to the bottom of the combustion chamber.

7. The all-premixed down-fired burner according to claim 1, characterized in that, The funnel-shaped flow divider cover (18) is fixedly connected to the lower bottom plate (16) by bolts to seal between the secondary air volume channel (17) and the combustion chamber inner cavity (19).

8. The fully premixed down-fired burner according to claim 1, characterized in that, The end of the secondary air volume channel (17) has two branches, which are respectively communicated with the combustion chamber and the combustion chamber inner cavity (19).

9. The all-premixed downward-fired burner according to claim 1, wherein The area of a single fire hole on the outer flame port (2) and the inner flame port (6) is 3 - 9 mm2; the ratio of the total area of the fire holes on the outer flame port (2) and the inner flame port (6) to the burner power is 145 - 155 mm2 / kW.

10. A condensing gas volumetric water heater, characterized in that, It includes the full-premix down-fired burner according to any one of claims 1-9, and also includes a housing assembly, an inner tank water storage container, and a condensation treatment system; The housing assembly is wrapped outside the inner tank water storage container, the burner is arranged in the inner cavity of the inner tank water storage container, and the condensation treatment system is arranged between the housing assembly and the lower end of the inner tank water storage container.

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