Fire grate, burner and gas water heater

Abstract

The invention discloses a fire grate, a burner and a gas water heater. An injection opening and a plurality of main fire holes are formed in the fire grate, a gas supply channel is further arranged in the fire grate, the gas supply channel is provided with a gas inlet section, a bent section and a distribution section which are sequentially connected, the injection opening is communicated with the gas inlet section, and the main fire holes are arranged side by side in the length direction of the distribution section. A first throttling protrusion part and a second throttling protrusion part are further arranged in the fire grate, the first throttling protrusion part is arranged on the outer side of the bent section, and the second throttling protrusion part is arranged on the outer side of the first throttling protrusion part and extends in the length direction of the distribution section. The mixing uniformity of gas and air in a fire grate of the combustor is improved, so that the combustion sufficiency of the gas is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of household appliances, and particularly relates to a fire grate, a burner and a gas water heater. BACKGROUND

[0002] At present, water heaters are commonly used household appliances in people's daily life. Water heaters are divided into types such as gas water heaters and electric water heaters, among which, the gas water heater is widely used due to its convenient use. A conventional gas water heater usually comprises components such as a fan, a burner, a combustion chamber and a heat exchanger, and the burner burns gas in the combustion chamber to heat water flowing through the heat exchanger.

[0003] The burner is an important component of the gas water heater, and the Chinese patent CN 218095940 U discloses a fire grate, a burner and a gas water heater, wherein, in order to reduce the phenomenon of local load concentration, a pressure type is arranged at the turning part of the gas supply channel to block too much gas from flowing from the corner position to the fire hole output at the end of the fire grate.

[0004] However, in actual use, although the pressure type on the fire grate can reduce the gas supply amount of the fire hole at the turning part of the gas supply channel, due to the relatively large flow rate of the gas flow in the gas supply channel, large vortexes are still generated, which further affects the gas flow out of this area. This causes abnormal flame and poor stability when the fire hole burns. In view of this, how to design a technology to improve the uniformity and stability of the fire grate combustion is a technical problem to be solved by the present application. SUMMARY

[0005] The present application provides a fire grate, a burner and a gas water heater, which can improve the uniformity of gas and air mixing in the fire grate of the burner to improve the fullness of gas combustion.

[0006] To achieve the above technical purpose, the present application adopts the following technical scheme: In one aspect, the present application provides a fire grate, which is provided with an injection port and a plurality of main fire holes, and the inside of the fire grate is further provided with a gas supply channel, the gas supply channel has a gas inlet section, a curved section and a distribution section connected in sequence, the injection port is in communication with the gas inlet section, a plurality of main fire holes are arranged side by side along the length direction of the distribution section, and the inside of the fire grate is further provided with a first throttling protrusion and a second throttling protrusion, the first throttling protrusion is arranged on the outside of the curved section, and the second throttling protrusion is arranged on the outside of the first throttling protrusion and extends along the length direction of the distribution section.

[0007] In an embodiment of the present application, the first throttling protrusion is arc-shaped and extends along the bending direction of the curved section.

[0008] In an embodiment of the present application, the inner part of the fire grate is provided with a flow distribution chamber outside the curved section, and the flow distribution chamber is in communication with the curved section of the air supply channel.

[0009] In an embodiment of the present application, the first throttling protrusion is arranged at a position where the flow distribution chamber is in communication with the curved section of the air supply channel.

[0010] In an embodiment of the present application, the second throttling protrusion is in a strip structure and is arranged transversely in the flow distribution chamber.

[0011] In an embodiment of the present application, the fire grate is further provided with a combustion channel and a gradually widening channel, the combustion channel, the gradually widening channel and the distribution section all extend along the length direction of the fire grate, the combustion channel and the gradually widening channel are arranged side by side and in communication with each other, the flow distribution chamber and the distribution section are in communication with the gradually widening channel respectively, the gradually widening channel gradually widens along the direction of airflow entering the combustion channel, and the main fire hole is in communication with the combustion channel.

[0012] In another aspect, an embodiment of the present application further provides a gas burner, which comprises a housing and a plurality of fire grates, the fire grates are the above-mentioned fire grates, and the plurality of fire grates are arranged side by side and arranged in the housing.

[0013] In an embodiment of the present application, a side wall of the housing is provided with a plurality of first air vents, the plurality of first air vents are arranged side by side, and the lower part of the housing is further provided with at least one second air vent. A secondary air channel is formed between two adjacent fire grates, the injection section of the fire grate is connected with the corresponding first air vent, the fire grate is arranged above the second air vent, and the secondary air channel is in communication with the second air vent.

[0014] In an embodiment of the present application, the housing comprises an enclosure and a bottom plate, the first air vent is arranged on a side wall of the enclosure, and a positioning rib is arranged on the inner surface of the enclosure around the outer periphery of the first air vent. The second air vent is arranged on the bottom plate, the bottom plate is arranged at the bottom of the enclosure, the bottom plate is provided with a plurality of mounting clamping grooves, and the mounting clamping grooves are arranged opposite to the corresponding positioning ribs. The injection port of the fire grate is connected with the corresponding positioning rib, and the fire grate is further clamped in the corresponding mounting clamping groove.

[0015] In another aspect, an embodiment of the present application further provides a gas water heater, which comprises a machine shell and the above-mentioned gas burner, and the gas burner is located in the machine shell.

[0016] By setting the first throttling protrusion and the second throttling protrusion on the outside of the bending section inside the fire row, for the second throttling protrusion, the second throttling protrusion is arranged along the length direction of the distribution section, so that when the gas flow flows through the bending section, part of the gas flow is diverted to flow into the distribution section to be uniformly distributed to the corresponding main fire hole of the distribution section, and the gas flow flowing to the outside of the bending section will first pass through the first throttling protrusion to reduce the inflow amount of the gas flow, at the same time, the gas flow flowing through the first throttling protrusion will be further diffused inside the fire row by the second throttling protrusion, the first throttling protrusion can effectively reduce the excessive gas flow flowing out due to the gas flow through the bending section, thereby avoiding that the main fire hole of the area where the gas flow in the distribution section flows is distributed too much gas; and the further throttling of the second throttling protrusion to further throttle the gas flow flowing through the first throttling protrusion and uniformly distribute it can effectively reduce the influence of the vortex and improve the gas flow velocity of the main fire hole in the vortex area to improve the uniformity of the fire row combustion and the stability of the flame. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Figure 1 is a structural schematic diagram of an embodiment of the fire row of the present application; Figure 2 is a structural schematic diagram of an embodiment of the fire row of the present application; Figure 3 is a local structural schematic diagram of an embodiment of the fire row of the present application; Figure 4 is a sectional view of an embodiment of the fire row of the present application; Figure 5 is a sectional view of an embodiment of the fire row of the present application; Figure 6 is a structural schematic diagram of a flame stabilizing shell in an embodiment of the fire row of the present application; Figure 7 is a flame simulation simulation diagram of the fire row of the present application; Figure 8 is a flame simulation simulation diagram of the fire row of the present application; Figure 9 is a gas flow simulation simulation distribution diagram of the fire row of the present application; Figure 10 is a flame simulation simulation diagram of the fire row of the prior art; Figure 11This is a simulation diagram of the airflow distribution in the firebox of the prior art; Figure 12 This is one of the structural schematic diagrams of an embodiment of the burner of the present invention; Figure 13 This is a second schematic diagram of the structure of an embodiment of the burner of the present invention; Figure 14 This is the third structural schematic diagram of an embodiment of the burner of the present invention; Figure 15 for Figure 12 Schematic diagram of the structure of the first mounting plate; Figure 16 for Figure 12 Schematic diagram of the structure of the second mounting plate; Figure 17 for Figure 12 Schematic diagram of the inner lining plate; Figure 18 This is one of the assembly diagrams of the burner and the outer casing in an embodiment of the burner of the present invention; Figure 19 This is the second assembly diagram of the burner and the outer shell in an embodiment of the burner of the present invention. Detailed Implementation

[0019] 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.

[0020] It should be noted that in the description of this invention, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection", "fixed", and the like should be interpreted broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0023] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, which does not indicate the relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0024] The gas water heater is a water heater that uses gas as the main energy material, and transfers the high-temperature heat generated by the combustion of the gas to the cold water flowing through the heat exchanger to achieve the purpose of preparing hot water.

[0025] The gas water heater generally includes a shell, and a burner, a heat exchanger, a fan and a fan cover arranged in the shell.

[0026] Among them, the gas is delivered to the burner, and the gas is ignited by the ignition device to make the burner burn the delivered gas, thereby generating heat.

[0027] The heat exchanger is provided with a heat exchange pipe, one end of the heat exchange pipe is communicated with a water supply pipe, and the other end of the heat exchange pipe is communicated with a shower or a faucet.

[0028] The heat generated by the burner burning the gas is used to heat the heat exchange tubes, thereby raising the temperature of the water inside the heat exchange tubes to form hot water.

[0029] When a gas water heater is working, cold water supplied by the water supply pipe flows into the heat exchange tube, and is then heated into hot water by the heat source generated by the burner. The hot water then flows out from the shower head or faucet through the hot water valve for the user's use.

[0030] At the same time, when the gas water heater is working, the fan is powered on and running simultaneously. Under the action of the fan, the flue gas generated by the burner is discharged outdoors.

[0031] like Figures 1-6 As shown, one embodiment of this application provides a burner 11. The burner 11 typically has an injector 11 and multiple main burner holes 12. The burner 11 also includes an air supply channel 13, a combustion channel 14, and a distribution chamber 16. The air supply channel 13 has an intake section 131, a curved section 132, and a distribution section 133 connected in sequence. The injector 11 communicates with the intake section 131. The multiple main burner holes 12 are arranged side-by-side along the length of the distribution section 133. The distribution chamber 16 communicates with the curved section 132, and both the distribution section 133 and the distribution chamber 16 communicate with the combustion channel 14. Optionally, the burner 1 also includes a widening channel 15, through which the distribution section 133 and the distribution chamber 16 communicate with the combustion channel 14.

[0032] During use, gas and air enter the intake section 131 through the injector 11. When the airflow passes through the curved section 132, part of the airflow changes direction and flows into the distribution section 133, while part of the airflow will flow to the diversion chamber 16 outside the curved section 132 by inertia.

[0033] In Example 1, in order to reduce the technical problem of uneven gas distribution caused by the airflow impact of the curved section 132, at least the following structural improvements are made to the firebox 1.

[0034] The interior of the fire rack 1 is provided with a first throttling protrusion 161 and a second throttling protrusion 162 in the diversion chamber 16. The first throttling protrusion is arranged on the outside of the curved section 132, and the second throttling protrusion is arranged on the outside of the first throttling protrusion and extends along the length direction of the distribution section 133.

[0035] Specifically, the first throttling protrusion is adjacent to and located outside the curved section 132. After the airflow enters the curved section 132, the airflow flowing towards the diversion chamber 16 is effectively prevented from entering the diversion chamber 16 due to the throttling effect of the first throttling protrusion. As for the airflow entering the diversion chamber 16, it will be further throttled by the second throttling protrusion during its flow towards the combustion channel 14, so that the airflow is more evenly distributed and output from the diversion chamber 16.

[0036] More importantly, because the first throttling protrusion 161 is arranged laterally within the diversion chamber 16, it can further obstruct the airflow entering the diversion chamber 16, thereby reducing the formation of vortices within the diversion chamber 16. (Reference) Figure 11 As shown, in conventional technology Figure 11 A large vortex will form in region C within the diversion chamber 16; while Figure 9 The range of the vortex formed in region B within the diversion chamber 16 of this application is significantly reduced.

[0037] In one embodiment, the first throttling protrusion is generally arc-shaped and extends along the bending direction of the curved segment 132.

[0038] Specifically, regarding the first throttling protrusion, since it is arranged on the outside of the curved section 132, the first throttling protrusion is designed to conform to the shape of the curved section 132. On the one hand, the first throttling protrusion can play a throttling role. On the other hand, the first throttling protrusion can further guide the airflow to the distribution section 133, which is more conducive to improving the uniformity of gas distribution.

[0039] In another embodiment, a diversion chamber 16 is provided inside the burner 1 outside the curved section 132, and the diversion chamber 16 communicates with the curved section 132 of the air supply channel 13. Furthermore, a first throttling protrusion is arranged at the location where the diversion chamber 16 communicates with the curved section 132 of the air supply channel 13.

[0040] Specifically, the first throttling protrusion is arranged at the connection between the flow divider 16 and the curved section 132 to maximize the throttling effect, ensure uniform gas distribution, and improve combustion completeness.

[0041] In some embodiments, the second throttling protrusion is a strip-shaped structure and is arranged laterally within the diversion chamber 16.

[0042] Specifically, for the second throttling protrusion, the throttling effect of the second throttling protrusion does not need to be too large. It only needs to disperse the airflow evenly in the diversion chamber 16. For this purpose, the second throttling protrusion has a strip-shaped structure, which makes the width of the second throttling protrusion smaller and the length larger. In this way, the airflow entering the diversion chamber 16 can be dispersed more evenly.

[0043] In some embodiments, the combustion channel 14, the widening channel 15, and the distribution section 133 all extend along the length of the burner 1. The combustion channel 14 and the widening channel 15 are arranged side by side and interconnected. The diversion chamber 16 and the distribution section 133 are respectively connected to the widening channel 15. The widening channel 15 gradually widens along the direction in which the airflow enters the combustion channel 14.

[0044] In Example 2, in order to reduce the impact of the flames at both ends of the burner 1 spreading outwards towards the ends and causing overheating damage to the burner wall, at least the following structural improvements are made to the burner 1.

[0045] The two ends of the burner 1 are respectively provided with combustion protrusions 17, the combustion protrusions 17 extend outward from the burner 1 along the gas outlet direction of the main burner hole 12, and the combustion protrusions 17 are provided with combustion holes 171. The plurality of main fire holes 12 are located between the combustion protrusions 17 at both ends of the fire bar 1.

[0046] Specifically, a number of main flame holes 12 are arranged sequentially along the length of the flame hole 1 on the upper surface of the flame hole 1, and a combustion protrusion 17 protruding from the upper surface of the flame hole 1 is additionally provided at the end of the flame hole 1 outside the main flame hole 12. The combustion hole 171 provided in the combustion protrusion 17 is also connected to the combustion channel 14.

[0047] During operation, the mixture of fuel gas and air is simultaneously output from the main burner port 12 and the combustion ports 171 at both ends and ignited. Since the root of the flame generated by the combustion port 171 is higher than the root of the flame generated by the main burner port 12, the flame generated by the combustion port 171 is less affected by the flame generated by the main burner port 12 adjacent to it. This ensures that the flame generated by the combustion port 171 can burn in a direction that is substantially perpendicular to the upper surface of the burner 1, and the flame generated by the combustion port 171 will not spread outward toward the end of the burner 1, thus effectively reducing the flame's ability to heat the side walls of the burner.

[0048] In practical design, because good verticality during flame formation has a less significant impact on the heating of the burner's side walls, the number of cooling holes on the combustion chamber wall can be reduced, thus reducing the amount of cooling air. For top-extraction models, fewer cooling holes increase machine sealing, and the air that would otherwise be used for cooling participates in combustion, further reducing combustion pollutants.

[0049] refer to Figure 10 As shown, in conventional technology Figure 10 The flames at both ends of the burner 1 tend to expand outwards towards the ends of the burner 1, and there is a situation where the flame at the main burner hole 12 corresponding to the curved section 132 is too high, resulting in overheating of the burner sidewalls and uneven combustion distribution. Figure 7 and Figure 8 The flame generated by the burner 1 shown in this application is produced by combustion through combustion holes 171 formed by combustion protrusions 17 at its end. The flame generated by the combustion holes 171 (see reference) Figure 8 When forming area A, good verticality has a less significant impact on the heating of the burner's sidewalls.

[0050] In another embodiment of this application, the two ends of the burner 1 are respectively provided with flanged holes, and the flanges of the flanged holes extend outward from the burner 1 along the gas outlet direction of the main burner hole 12; the flanged holes are the combustion protrusions 17.

[0051] Specifically, in order to facilitate the processing of the combustion protrusion 17, during the processing of the burner 1, a flanged hole can be formed by punching the upper surface of the burner 1. The flange of the flanged hole will extend upward toward the upper surface of the burner 1, thus forming the combustion protrusion 17 and the corresponding combustion hole 171.

[0052] In another embodiment, a plurality of combustion protrusions 17 may be provided at both ends of the fire bar 1 as needed.

[0053] Specifically, by providing multiple combustion protrusions 17 at the end of the fire bar 1, the flame output from the end of the fire bar 1 through the combustion hole 171 can be vertically upward and have sufficient width to resist the influence of the flame adjacent to the main fire hole 12, so as to reduce the flame of the fire bar 1 from expanding to the outside of the end.

[0054] In some embodiments, for the combustion hole 171, in order to make the flame formed by the combustion hole 171 have better impact resistance, the gas outlet area of ​​the combustion hole 171 is not less than the gas outlet area of ​​the main fire hole 12.

[0055] Specifically, the air outlet area of ​​the combustion hole 171 can be designed to be slightly larger. On the one hand, this ensures that there is enough airflow to be output from the combustion hole 171, thereby obtaining a more stable flame. On the other hand, increasing the air outlet area of ​​the combustion hole 171 allows for smoother airflow output at both ends, thus solving the problem of uneven airflow distribution at the ends and improving the uniformity of airflow distribution at different positions of the burner 1.

[0056] In Example 3, in order to reduce incomplete combustion of gas and unstable flame, at least the following structural improvements are made to the burner 1.

[0057] Flame stabilizing shells 19 are respectively provided on both sides of the fire bar 1, and flame stabilizing flow channels are formed between the flame stabilizing shells 19 and the fire bar 1. The flame stabilizing shells 19 cover the outside of the auxiliary fire hole 18. The flame stabilizer shell 19 has a positioning protrusion 191 on its inner surface, and the positioning protrusion 191 abuts against the side wall of the fire bar 1.

[0058] Specifically, flame stabilizing shells 19 are provided on both sides of the top of the fire rack 1. The flame stabilizing shells 19 can form a flame stabilizing channel between themselves and the side wall of the fire rack 1. The auxiliary fire holes 18 provided on both sides of the fire rack 1 will be covered by the flame stabilizing shells 19. The airflow output from the auxiliary fire holes 18 is output upward from the flame stabilizing channel to cooperate with the flame formed by the main fire hole 12 for combustion.

[0059] The flame stabilizer shell 19 features a positioning protrusion 191 that rests against the side wall of the burner 1. The protrusion size of the positioning protrusion 191 effectively and precisely controls the width of the flame stabilizing channel, ensuring that the width of the flame stabilizing channels on both sides of the burner 1 remains consistent. This improves the completeness of gas combustion and ensures a stable flame shape. The design of the positioning protrusion 191 ensures that the dimensions of the flame stabilizing channel on one side meet the design requirements, and also ensures that the dimensions of the flame stabilizing channels on both sides are symmetrical. In some embodiments, a plurality of positioning protrusions 191 are provided on the inner surface of the flame stabilizer shell 19, and the plurality of positioning protrusions 191 are arranged side by side along the length direction of the flame bar 1.

[0060] Specifically, for the flame stabilizer shell 19, its inner wall is provided with multiple positioning protrusions 191 along the length of the fire bar 1. The multiple positioning protrusions 191 can ensure that the width of the flame stabilizer channel remains consistent along the length of the fire bar 1.

[0061] The airflow output from the flame stabilizer channel also forms a flame above it, which, in conjunction with the main flame formed by the main flame hole, ensures more complete and stable combustion. This allows flame purifier 1 to achieve a higher combustion load, significantly increasing its TDR (maximum load / minimum load). Flame purifier 1 is highly versatile and can be adapted to different models and altitude environments.

[0062] In some embodiments, a plurality of connecting ribs 192 are provided between the two flame stabilizers 19, and the connecting ribs 192 are located between two adjacent main fire holes 12.

[0063] Specifically, the flame stabilizing shells 19 on both sides of the fire rack 1 are connected by multiple connecting ribs 192, so that the two flame stabilizing shells 19 are assembled onto the fire rack 1 as a whole, which facilitates processing and production.

[0064] In another embodiment, flame-transmitting plates 193 are provided at both ends of the flame-stabilizing shell 19, and the flame-transmitting plates 193 are bent toward the outside of the flame-stabilizing shell 19.

[0065] Specifically, gas water heaters are used in various scenarios, and users have different water temperature and flow requirements. Therefore, the number of burners (Burner 1) in a gas water heater varies, with each scenario corresponding to a different combustion segment. To meet the diverse needs of users in various scenarios, gas water heaters need to quickly switch between combustion segments. Therefore, the rapid ignition transfer performance between each Burner 1 is crucial.

[0066] By providing flame-transfer plates 193 at both ends of the flame stabilizer shell 19, the flame-transfer plates 193 have a narrower area that does not need to be too large, and flame transmission can be achieved through the flame-transfer plates 193 at the ends. On the other hand, the flame-transfer plates 193 are located on one side of the combustion hole 171, and the combustion hole 171 can generate a stable flame shape to meet the needs of rapid and stable flame transmission between two adjacent fire rows 1 through the flame-transfer plates 193. In addition, the number of flame-transfer plates 193 is small and their area is small, resulting in minimal interference with the airflow on both sides of the fire row 1 and minimal impact on combustion.

[0067] Example 4: Based on Examples 1 to 3 above, this application also provides a burner that can adopt the burner structure configuration of Examples 1, 2, and / or 3. The following improvements are made to the burner installation structure, primary air, and secondary air design.

[0068] like Figures 12-19 As shown in one embodiment of this application, a burner is provided, including: a housing 2 and a plurality of burner bars 1, wherein the plurality of burner bars 1 are arranged side by side and disposed in the housing 2, and the burner bars 1 have an ejector section for introducing fuel gas and primary air for combustion.

[0069] In order to improve the uniform distribution of secondary air in the burner 1 and ensure that the gas and air are mixed evenly at each position of the burner 1 to improve the combustion efficiency, the following structural improvements are made to the outer casing 2 and the burner 1.

[0070] The outer casing 2 has a plurality of first ventilation openings 201 on one side wall, the plurality of first ventilation openings 201 are arranged side by side, and the lower part of the outer casing 2 is also provided with at least one second ventilation opening 202. A secondary air duct is formed between two adjacent fire bars 1. The ejector section of the fire bar 1 is connected to the corresponding first ventilation port 201. The fire bar 1 is arranged above the second ventilation port 202. The secondary air duct is connected to the second ventilation port 202.

[0071] Specifically, after the burner 1 is installed in the outer casing 2, the injection port of the injector section of the burner 1 is connected to the first vent 201 on the outer casing 2. The combustion gas mixed with primary air enters the injection port through the first vent. After the combustion gas and primary air are mixed in the burner 1 and ignited through the exhaust port of the burner 1, secondary air is introduced into the outer casing 2 through the second vent 202 located at the bottom of the outer casing 2. Furthermore, since the second vent 202 is located at the bottom of the outer casing 2, it is easy to design the opening of the vent according to the secondary air demand at different positions of the burner 1, so as to ensure that the secondary air can be more evenly distributed at the exhaust ports at various positions of the burner 1, thereby achieving full mixing of combustion gas and secondary air and improving combustion efficiency.

[0072] After the secondary air enters the outer casing 2 through the second vent 202, it enters the secondary air duct formed between the burners 1 and flows along the secondary air duct to the air outlet of the burner 1.

[0073] In some embodiments, the bottom of the outer casing 2 is formed with a bent surface that matches the lower contour of the fire bar 1; the bent surface is provided with a second ventilation opening 202.

[0074] Specifically, for the burner 1, its top is usually relatively flat due to the configuration of the air vents, while the bottom of the burner 1 has a height difference due to the compression design. Therefore, in order to ensure that the airflow entering the housing 2 through the different second vents 202 can quickly enter the corresponding part of the secondary air duct, the bottom of the housing 2 is designed as a bent surface so that the bent surface matches the bottom contour of the burner 1, thereby reducing the large gap space formed at the bottom of the burner 1 and affecting the air intake of the secondary air duct.

[0075] In one embodiment, the bottom of the fire bar 1 forms a downwardly extending extension 101, and the ejector section is formed on the extension 101; A first overlap portion 102 is formed between the end of the fire bar 1 away from the ejector port of the ejector section and the extension portion 101; The bent surface has a first mounting surface 203 and a second mounting surface 204. The first mounting surface 203 is higher than the second mounting surface 204. The second vent 202 includes a first sub-vent 2021 and a second sub-vent 2022. The first sub-vent 2021 is formed on the first mounting surface 203, and the second sub-vent 2022 is formed on the second mounting surface 204. The first overlapping portion 102 is arranged above the first mounting surface 203, and the extension portion 101 is arranged above the second mounting surface 204.

[0076] Specifically, for the structural design requirements of the heat exchanger 1, an extension 101 is provided at its bottom to form an ejector section. At this time, the end of the heat exchanger 1 away from the ejector port facilitates the creation of a height difference between the extensions 101, thereby forming a first overlap 102. In order to ensure the air intake, the secondary air duct in the area between the two first overlaps 102 of two adjacent heat exchangers 1 can be made so that the bent surface forms a first mounting surface 203 that is tightly attached to the bottom of the first overlap 102. In this way, the installation requirements are met, and the secondary air introduced by the first sub-air inlet 2021 on the first mounting surface 203 can directly enter the secondary air duct where the first overlap 102 is located, ensuring sufficient secondary air supply.

[0077] In another embodiment, a second overlap 103 is formed between the end of the fire bar 1 adjacent to the ejector port of the ejector section and the extension 101; The second mounting plate 22 has a third mounting surface 205, which is higher than the second mounting surface 204, and the second mounting surface 204 is located between the first mounting surface 203 and the third mounting surface 205; The second ventilation opening 202 includes a third sub-vent 2023, which is formed on the third mounting surface 205; The third overlapping portion is arranged above the third mounting surface 205.

[0078] Specifically, a second overlapping portion 103 is formed at the end of the burner 1 near the ejector section for installation, and the burner 1 overlaps with the third mounting surface 205 through the second overlapping portion 103. Simultaneously, to ensure sufficient secondary air supply at the second overlapping portion 103, a third sub-air inlet 2023 is also provided on the third mounting surface 205. The third sub-air inlet 2023 is adjacent to the bottom of the second overlapping portion 103, allowing the secondary air introduced through the third sub-air inlet 2023 to directly enter the secondary air duct. In this way, sufficient secondary air supply can be obtained at all positions of the burner 1, improving the uniformity of gas-air mixing and thus improving the completeness of gas combustion.

[0079] In some embodiments, the first mounting surface 203 is provided with a plurality of first sub-air inlets 2021 arranged side by side, so as to supply secondary air evenly distributed at the bottom of each fire rack 1 through the plurality of first sub-air inlets 2021. Alternatively, the first sub-air inlets 2021 may be designed as strip-shaped holes, extending along the length of the fire rack 1 and located on one side of the fire rack 1.

[0080] In some embodiments, the second mounting surface 204 is provided with a plurality of second sub-air vents 2022 arranged side by side. The second sub-air vents 2022 are strip-shaped holes and extend along the length direction of the fire rack 1. Specifically, there may be multiple second sub-air vents 2022, and the second sub-air vents 2022 also extend along the length direction of the fire rack 1.

[0081] Alternatively, the second mounting surface 204 may be provided with at least one second sub-air vent 2022, which extends along a length direction perpendicular to the fire bar 1. Specifically, there may be one second sub-air vent 2022, which occupies sufficient space on the second mounting surface 204 to meet the secondary air intake requirements of a large area at the bottom of the multi-row fire bar 1.

[0082] In some embodiments, the third mounting surface 205 is provided with a plurality of third sub-air inlets 2023 arranged side by side, so as to supply secondary air evenly distributed at the bottom of each fire rack 1 through the plurality of third sub-air inlets 2023. Alternatively, the third sub-air inlets 2023 may be designed as strip-shaped holes, extending along the length of the fire rack 1.

[0083] By setting a second vent 202 at the bottom of the outer casing 2, the second vent 202 can be distributed according to the requirements of secondary ventilation at the bottom of the burner 1. Thus, during use, it can be ensured that the secondary air distribution at different positions of the burner 1 is uniform, thereby improving the uniformity of gas-air mixing and improving the completeness of gas combustion.

[0084] like Figures 12-19 As shown, for the burner 1, multiple burners 1 need to be assembled side by side into the housing 2. In order to reduce the number of parts used, reduce manufacturing costs and improve assembly efficiency, the following structural improvements are made to the housing 2 and the burner 1.

[0085] The outer casing 2 includes a enclosure and a base plate 23. A plurality of first ventilation openings 201 are provided on one side wall of the enclosure, and positioning ribs 206 are provided around the outer periphery of the first ventilation openings 201 on the inner surface of the enclosure. The base plate 23 is provided at the bottom of the enclosure, and a plurality of mounting slots 207 are provided on the base plate 23. The mounting slots 207 are arranged opposite to the corresponding positioning ribs 206. Multiple fire bars 1 are arranged side by side and installed in the outer casing 2. The ejector port of the ejector section of the fire bar 1 is connected to the corresponding positioning rib 206. The fire bar 1 is also locked in the corresponding mounting slot 207.

[0086] The positioning rib 206 has a ring structure and is inserted into the ejector port.

[0087] Specifically, during the assembly process, the ejector ports of multiple fire bars 1 are connected to the positioning ribs 206 to position the ejector ports of the fire bars 1. Then, the ends of the fire bars 1 away from the positioning ribs 206 are locked in the positioning slots 208. In this way, the fire bars 1 can be installed using only the assembly structure in the housing 2, without the need for an additional independent mounting bracket, reducing the number of parts and improving assembly efficiency.

[0088] In some embodiments, the enclosure includes a first mounting plate 21 and a second mounting plate 22, the first mounting plate 21 having a U-shaped cross-section, the second mounting plate 22 being connected between the two ends of the first mounting plate 21, and the base plate 23 being disposed at the bottom of the second mounting plate 22; The second mounting plate 22 is provided with the first ventilation opening 201 and the positioning rib 206.

[0089] Specifically, the enclosure has a split structure. The first mounting plate 21 is a semi-enclosed structure, while the second mounting plate 22 is equipped with a first ventilation opening 201 to meet the requirements for gas and primary air intake.

[0090] In another embodiment, the outer casing 2 further includes an inner lining plate 24, which is disposed on the inner wall of the first mounting plate 21 and arranged outside the fire bar 1; The inner lining plate 24 is provided with a positioning part extending toward the second mounting plate 22 at the part opposite to the second mounting plate 22, and the edge of the positioning part is provided with a plurality of positioning slots 208. The fire bar 1 is inserted into the corresponding positioning slot 208.

[0091] Specifically, in order to reduce the heat transfer from the outer shell 2 to the outside during combustion of the firebox 1, an inner lining plate 24 is installed inside the outer shell 2 for heat insulation. An air gap is formed between the inner lining plate 24 and the outer shell 2 to achieve the function of heat insulation.

[0092] Furthermore, by further providing a positioning slot 208 on the inner liner plate 24, the positioning slot 208 can position the end of the fire bar 1 away from the ejector port, thereby more effectively improving the installation accuracy and reliability of the fire bar 1.

[0093] In some embodiments, in order to facilitate the installation of the inner liner 24 on the outer shell 2, the first mounting plate 21 is also provided with an inwardly and upwardly extending positioning tongue 211, and the lower edge of the inner liner 24 is engaged between the positioning tongue 211 and the first mounting plate 21.

[0094] Specifically, when installing the inner liner 24, the inner liner 24 is placed inside the first mounting plate 21 and pre-positioned and supported by the positioning tab 211. Then, the upper part of the inner liner 24 can be fixedly connected to the first mounting plate 21 by a reduced number of screws.

[0095] In another embodiment, the positioning rib 206, the mounting slot 207, and the positioning slot 208, which are connected and cooperate with the same fire bar 1, are arranged in sequence.

[0096] Specifically, after the fire block 1 is assembled, the two ends of the fire block 1 will be limited and fixed by the positioning ribs 206 and the positioning slots 208, while the bottom of the fire block 1 can be further supported and fixed by the mounting slots 207. In this way, the fire block 1 can be reliably assembled into the outer shell 2.

[0097] The positioning slot 208 is arranged diagonally above the mounting slot 207.

[0098] In another embodiment, a second vent 202 is provided on the base plate 23 to meet the secondary air supply requirements.

[0099] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A firebox, wherein the firebox is provided with an ejector port and a plurality of main flame holes, and the firebox is further provided with an air supply channel, the air supply channel having an intake section, a curved section and a distribution section connected in sequence, the ejector port communicating with the intake section, and the plurality of main flame holes arranged side by side along the length direction of the distribution section, characterized in that, The fire bar is also provided with a first throttling protrusion and a second throttling protrusion. The first throttling protrusion is arranged on the outside of the curved section, and the second throttling protrusion is arranged on the outside of the first throttling protrusion and extends along the length direction of the distribution section.

2. The fire grill according to claim 1, characterized in that, The first throttling protrusion is arc-shaped and extends along the bending direction of the curved section.

3. The fire grill according to claim 1, characterized in that, The interior of the firebox has a diversion chamber located outside the curved section, and the diversion chamber is connected to the curved section of the gas delivery channel.

4. The fire grill according to claim 3, characterized in that, The first throttling protrusion is located at the point where the flow divider chamber communicates with the curved section of the air delivery channel.

5. The fire grill according to claim 3, characterized in that, The second throttling protrusion has a strip-shaped structure and is arranged laterally in the diversion chamber.

6. The fire grill according to claim 5, characterized in that, The firebox is also provided with a combustion channel and a widening channel. The combustion channel, the widening channel and the distribution section all extend along the length of the firebox. The combustion channel and the widening channel are arranged side by side and connected to each other. The diversion chamber and the distribution section are respectively connected to the widening channel. The widening channel gradually widens along the direction of airflow entering the combustion channel. The main fire hole is connected to the combustion channel.

7. A burner comprising a housing and a plurality of burner bars, characterized in that, The fire bar is the fire bar as described in any one of claims 1-6, and a plurality of the fire bars are arranged side by side and disposed in the housing.

8. The burner according to claim 7, characterized in that, The outer casing has a plurality of first ventilation openings on one side wall, the plurality of first ventilation openings being arranged side by side, and the lower part of the outer casing also has at least one second ventilation opening; A secondary air duct is formed between two adjacent fire bars. The ejector section of the fire bar is connected to the corresponding first ventilation opening. The fire bar is arranged above the second ventilation opening. The secondary air duct is connected to the second ventilation opening.

9. The burner according to claim 8, characterized in that, The outer shell includes a enclosure and a base plate. A first ventilation opening is provided on one side wall of the enclosure, and positioning ribs are provided on the inner surface of the enclosure around the outer perimeter of the first ventilation opening. The base plate is provided with the second ventilation opening, the base plate is located at the bottom of the enclosure, and the base plate is provided with a plurality of mounting slots, the mounting slots being arranged opposite to the corresponding positioning ribs; The ejector port of the fire bar is connected to the corresponding positioning rib, and the fire bar is also locked in the corresponding mounting slot.

10. A gas water heater, comprising a casing, characterized in that, It also includes a burner as described in any one of claims 7-9, wherein the burner is located in the housing.

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