Combustor and gas water heater

Abstract

The utility model belongs to the technical field of gas appliances, and particularly discloses a burner and a gas water heater. The combustor comprises a fire grate and a nozzle. An injection cavity is formed in the fire grate; the nozzle and the fire row are correspondingly arranged, an outlet of the nozzle faces an inlet of the injection cavity, the nozzle and the inlet of the injection cavity are arranged in a spaced mode, and the center line of the nozzle is higher than the center line of the inlet of the injection cavity. The gas water heater comprises a combustion chamber and further comprises the combustor, and the combustor is arranged in the combustion chamber. According to the combustor, the uniformity of gas distribution in the injection cavity and the overall injection and mixing effect of the fire grate can be guaranteed, finally, the uniformity of flames during combustion of the combustor and the temperature uniformity of a combustion chamber of the gas water heater can be guaranteed, and generation of nitric oxide is reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas appliance technology, and in particular to a burner and a gas water heater. Background Technology

[0002] A gas water heater is a gas appliance that uses gas as fuel and heats water by burning it in a burner, transferring the heat to cold water flowing through a heat exchanger to produce hot water.

[0003] A gas water heater burner typically consists of multiple parallel burners, each with a corresponding nozzle. Gas enters the nozzle through the gas distribution pipe of the gas water heater. The gas through the nozzle draws in surrounding air, and the gas and air enter the burner together. In the ejector chamber of the burner, the gas and air mix and flow separately, and are finally ignited at the burner's flame holes.

[0004] In existing technology, to ensure that the gas ejected from the nozzle accurately enters the inlet of the burner, the nozzle outlet and the inlet of the burner inlet are generally aligned. However, when the gas through the nozzle entrains surrounding air and enters the burner together, due to the obstruction of the gas water heater's distribution pipe, less air enters from above the nozzle and more air enters from below. This results in more air entering from the lower side of the burner inlet, causing the lower air to mix with the jet gas earlier. This leads to the gas being deflected towards the lower part of the burner inlet, resulting in uneven gas distribution within the burner inlet. This affects the overall inlet and mixing effect of the burner, as well as the uniformity of the combustion flame, ultimately leading to uneven temperature distribution within the combustion chamber of the gas water heater and promoting the generation of nitrogen oxides. Utility Model Content

[0005] One of the technical problems solved by this utility model is to provide a burner with high flame uniformity during combustion, thereby enabling uniform temperature distribution in the combustion chamber of the gas water heater and reducing the generation of nitrogen oxides.

[0006] The second technical problem solved by this utility model is to provide a gas water heater with high flame uniformity during combustion, uniform temperature distribution in the combustion chamber, and reduced generation of nitrogen oxides.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] The burner includes:

[0009] Fire bar, wherein an ejector cavity is provided inside the fire bar;

[0010] A nozzle is provided corresponding to the fire bar, with the nozzle outlet facing the inlet of the ejector cavity and the nozzle and the inlet of the ejector cavity being spaced apart. The centerline of the nozzle is higher than the centerline of the inlet of the ejector cavity.

[0011] The burner described in this utility model has the following advantages compared with the prior art:

[0012] In this burner, because the centerline of the nozzle is higher than the centerline of the inlet of the ejector chamber—meaning the nozzle's installation position is moved upwards compared to existing technologies—the space between the gas ejected from the nozzle and the space above the inlet of the ejector chamber is reduced. This creates a narrowing effect, facilitating the rapid entry of the gas ejected from the nozzle and the air above the inlet of the ejector chamber into the upper part of the ejector chamber. This allows for a greater influx of air and gas into the upper inlet of the ejector chamber, preventing excessive gas accumulation in the lower part of the ejector chamber and ensuring uniform gas distribution and effective overall ejection and mixing of the burner. When applied to gas water heaters, this burner ultimately ensures uniform flame uniformity during combustion and temperature uniformity in the combustion chamber, reducing the generation of nitrogen oxides.

[0013] In one embodiment, the height difference between the centerline of the nozzle and the centerline of the inlet of the ejector cavity is H1, 0 mm.

[0014] In one embodiment, the ejector cavity includes an inlet section and an outlet section that are connected at an angle, and the inlet section and the outlet section are connected through a transition cavity.

[0015] In one embodiment, the wall of the transition cavity is provided with at least one groove.

[0016] In one embodiment, the depth of the groove is greater than 2 mm.

[0017] In one embodiment, the wall of the transition cavity is provided with a plurality of grooves, which are arranged sequentially at intervals along the flow direction of the airflow.

[0018] In one embodiment, the fire bar includes a first half-shell and a second half-shell disposed opposite to each other. The first half-shell and the second half-shell are connected and surround to form the ejector cavity. Both the first half-shell and the second half-shell are provided with the groove. The groove located in the first half-shell and the groove located in the second half-shell are disposed opposite to each other or staggered.

[0019] The second technical problem mentioned above is solved by the following technical solution:

[0020] A gas water heater includes a combustion chamber and the aforementioned burner, wherein the burner is disposed within the combustion chamber.​

[0021] The gas water heater described in this utility model has the following advantages compared with the prior art:

[0022] The gas water heater includes the aforementioned burner. In the burner, because the centerline of the nozzle is higher than the centerline of the inlet of the ejector chamber, that is, compared with the prior art, the installation position of the nozzle is moved upward, and the space between the gas ejected from the nozzle and the space above the inlet of the ejector chamber is reduced. This creates a narrow tube effect, which facilitates the rapid entry of the gas ejected from the nozzle and the air above the inlet of the ejector chamber into the upper side of the ejector chamber. This allows more air and gas to enter the upper inlet of the ejector chamber, thus avoiding excessive gas in the lower side of the ejector chamber, which would lead to uneven gas distribution within the ejector chamber. It also ensures the uniformity of gas distribution within the ejector chamber and the overall ejection and mixing effect of the burner. Ultimately, this ensures the uniformity of the flame during combustion and the temperature uniformity of the combustion chamber of the gas water heater, reducing the generation of nitrogen oxides.

[0023] In one embodiment, the gas water heater further includes a gas supply system, the gas supply system including a gas distribution rod, the output end of the gas distribution rod extending into the combustion chamber, and the nozzle disposed at the output end of the gas distribution rod.

[0024] In one embodiment, the distance between the gas distributor and the outer surface of the front shell of the combustion chamber is greater than 5 mm. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of a gas water heater provided in an embodiment of the present utility model;

[0026] Figure 2 A schematic diagram of the assembled gas supply system and combustion system of a gas water heater provided for an embodiment of this utility model;

[0027] Figure 3 A cross-sectional structural diagram of the gas supply system and combustion system of the gas water heater provided in this embodiment of the utility model;

[0028] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 An exploded view of the fire briquette provided in an embodiment of this utility model;

[0030] Figure 6 A schematic diagram of the groove distribution structure in one structure of a fire extinguisher provided in an embodiment of this utility model;

[0031] Figure 7 for Figure 6Schematic diagram of the BB section;

[0032] Figure 8 A side view of another structure of the fire briquette provided in an embodiment of this utility model.

[0033] Label Explanation:

[0034] 10. Combustion chamber; 101. Front shell;

[0035] 20. Gas supply system; 201. Gas distributor; 202. Valve body;

[0036] 30. Fan;

[0037] 1. Flame purging chamber; 11. Ejector chamber; 111. Inlet section; 1111. Contraction section; 1112. Diffusion section; 112. Outlet section; 113. Transition chamber; 1131. Groove;

[0038] 12. First half-shell; 13. Second half-shell; 14. Sleeve plate; 15. Main fire hole; 16. Vent hole;

[0039] 2. Nozzle. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] See Figures 1-3 This embodiment provides a gas water heater.

[0045] Gas water heaters include a gas supply system, a combustion system, an air supply system, and a flue gas emission system.

[0046] The gas supply system provides gas, and the air supply system provides air. The gas and air mix to form a combustible mixture, which is then burned in the combustion system. The heat released is exchanged with the cold water flowing through the gas water heater to produce hot water for the user. The flue gas produced after combustion is discharged through the flue gas exhaust system.

[0047] The combustion system includes a burner. The combustion system also includes a combustion chamber 10, within which the burner is located and combustion occurs.

[0048] A fan 30 is installed below the combustion chamber. The fan 30 provides a portion of the air for combustion and participates in the combustion reaction of the gas. The fan 30 also provides a portion of the air to enter the air-cooling channel to cool the surface of the combustion chamber through convection heat exchange.

[0049] To avoid the technical problem of uneven gas distribution within the burner's ejector chamber, which exists in existing burners, see [link to relevant documentation]. Figures 3-5 In this embodiment, the burner includes a burner 1 and a nozzle 2.

[0050] The firebox 1 is equipped with an ejector chamber 11.

[0051] The nozzle 2 is arranged corresponding to the fire bar 1. The outlet of the nozzle 2 faces the inlet of the ejector cavity 11 and the nozzle 2 is spaced apart from the inlet of the ejector cavity 11. The center line of the nozzle 2 is higher than the center line of the inlet of the ejector cavity 11.

[0052] The burner provided in this embodiment has a nozzle 2 centerline that is higher than the centerline of the inlet of the ejector cavity 11. That is, compared with the prior art, the installation position of the nozzle 2 is moved upward, and the space between the gas ejected by the nozzle 2 and the space above the inlet of the ejector cavity 11 is reduced. This can generate a narrow tube effect, which is conducive to the gas ejected by the nozzle 2 and the air above the inlet of the ejector cavity 11 quickly entering the upper side of the ejector cavity 11. It is also conducive to the mixing of gas and air on the upper side of the ejector cavity. In this way, it avoids excessive gas on the lower side of the ejector cavity 11, which would lead to uneven gas distribution in the ejector cavity 11, and ensures the uniformity of gas distribution in the ejector cavity 11 and the overall ejection and mixing effect of the burner 1.

[0053] When applied to a gas water heater, this burner can ultimately ensure the uniformity of the flame during combustion and the temperature uniformity of the combustion chamber 10 of the gas water heater, thereby reducing the generation of nitrogen oxides.

[0054] In one embodiment, see Figure 3 and Figure 4 The height difference between the centerline of nozzle 2 and the centerline of the inlet of ejector cavity 11 is H1, 0 mm.

[0055] For example, in Figure 4 In the diagram, line a represents the centerline of nozzle 2, and line b represents the centerline of the inlet of ejector cavity 11. H1 is the distance between lines a and b, which is the height difference between the centerline of nozzle 2 and the centerline of the inlet of ejector cavity 11, 0 mm.

[0056] For example, the size of H1 can be 0.5mm, 1mm, 1.5mm, or 2mm; of course, in other embodiments, the size of H1 can also be set to other values, as long as it satisfies 0mm.

[0057] Furthermore, in one embodiment, see [link to relevant documentation]. Figures 1-4 The gas water heater also includes a gas supply system 20, which includes a gas distribution rod 201. The output end of the gas distribution rod 201 extends into the combustion chamber 10, and the nozzle 2 is located at the output end of the gas distribution rod 201.

[0058] The gas supply system 20 also includes a valve body 202, which can control the on / off state of the gas distribution rod 201.

[0059] In one embodiment, see Figure 4 The distance between the gas distributor 201 and the outer surface of the front shell 101 of the combustion chamber 10 is greater than 5 mm.

[0060] For example, in Figure 4 ​​​In this diagram, H2 represents the distance between the gas distribution rod 201 and the outer surface of the front shell 101 of the combustion chamber 10, where H2 > 5 mm. This configuration allows more air to enter above the inlet of the ejector chamber 11 of the burner 1. The increased amount of primary air entering above the inlet of the ejector chamber 11 reduces the downward deviation of the combustion gas, thus improving the uniformity of the combustion gas flow out of the ejector chamber 11. The increased amount of primary air entering above the inlet of the ejector chamber 11 also results in better mixing uniformity of the combustion gas and air.

[0061] Optionally, H2 can be 6mm, 7mm, 8mm, 9mm or 10mm, whichever you need to set, without too many restrictions.

[0062] Specifically, see Figure 5 In this embodiment, the burner 1 includes a burner body and a sleeve plate 14. The ejector cavity 11 is disposed in the burner body. The head of the burner body (i.e., the upper end of the burner body) is a hollow structure that communicates with the outlet of the ejector cavity 11. The upper surface of the head is provided with a main flame hole 15. The mixed gas in the ejector cavity 11 eventually flows to the main flame hole 15 and is ignited at the main flame hole 15. In order to further ensure the uniformity and fullness of the combustion of the mixed gas at the main flame hole 15, a vent hole 16 is provided on the side of the head of the burner body. Outside air can flow into the hollow structure of the head through the vent hole 16 to provide secondary air supply to the main flame hole 15.

[0063] The vent 16 is located near the upper surface of the head, which can shorten the residence time of oxygen in the secondary air in the high-temperature zone, reduce the reaction of oxygen and nitrogen at high temperatures, thereby reducing the generation of nitrogen oxides and improving the environmental protection level of the burner.

[0064] For example, in this embodiment, when H2 is 8mm, a methane molar concentration distribution map of the center section of the burner is generated using simulation software. From the methane molar concentration distribution map of the center section of the burner, it can be seen that the methane concentration at the head of burner 1 shows less gradient change. This size setting increases the primary air supply and ensures that the methane concentration distribution in the hollow cavity at the head of burner 1 is relatively uniform, which is beneficial to the stability of combustion.

[0065] When the gas water heater is working, the high-speed gas injected by the gas distributor 201 is ejected through the nozzle 2 and draws in the air around the nozzle 2 into the ejector chamber 11. In the ejector chamber 11, the gas mixes with the air and is split, and is finally ignited at the main burner hole 15 at the head of the burner 1.

[0066] Furthermore, in one embodiment, see [link to relevant documentation]. Figure 5 and Figure 6 The ejection cavity 11 includes an inlet section 111 and an outlet section 112 that are connected at an angle, and the inlet section 111 and the outlet section 112 are connected through a transition cavity 113.

[0067] The mixture of gas and air flows sequentially along the inlet section 111, the transition chamber 113 and the outlet section 112. The inlet section 111 and the outlet section 112 are set at an angle, which can extend the flow path of the mixture in a limited space, thereby making the gas and air mix more evenly in the ejector chamber 11.

[0068] Specifically, see Figure 6 The inlet section 111 includes a contraction section 1111 and a diffuser section 1112 connected sequentially along the airflow direction. Along the airflow direction, the flow cross-sectional area of ​​the contraction section 1111 gradually decreases to draw in more air. Along the airflow direction, the flow cross-sectional area of ​​the diffuser section 1112 gradually increases to convert some of the dynamic pressure into static pressure, thereby increasing the gas pressure and making the gas and air mix more evenly.

[0069] More specifically, the diffusion angle α of the diffuser section 1112 is less than 15° to reduce the resistance loss of the mixture in the diffuser section 1112. For example, α can be 10°, 11°, 12°, 13° or 14°, which can be set as needed, and this application does not impose any restrictions.

[0070] For example, when H1 is 1 mm, the streamline diagram inside the ejector cavity 11 is simulated using simulation software. A vortex appears at the tail end of the ejector cavity 11. The vortex below the side of the transition cavity 113 near the outlet section 112 pushes the mixed gas toward the outlet section 112 away from the transition cavity 113. The vortex at the end of the opening of the outlet section 112 near the transition cavity 113 becomes significantly smaller. The airflow streamline at the flame hole at this point tends to be close to the normal direction, which is conducive to the convergence of the flame.

[0071] Furthermore, in one embodiment, the wall surface of the transition cavity 113 is provided with at least one groove 1131. The groove 1131 can increase the turbulence of the airflow, accelerate the mixing of gas and air, thereby making the two mix more evenly, and ultimately ensuring the completeness of combustion and the uniformity of the flame.

[0072] Optionally, in one embodiment, the depth of the groove 1131 is greater than 2 mm. Exemplarily, the depth of the groove 1131 can be 3 mm, 4 mm, 5 mm or 6 mm, which can be set as needed, and this application does not impose any restrictions.

[0073] Alternatively, in one embodiment, the wall surface of the transition cavity 113 is provided with a plurality of grooves 1131, which are arranged sequentially at intervals along the flow direction of the airflow. This arrangement allows the plurality of grooves 1131 to sufficiently accelerate the mixing of the combustion gas and air in the flow direction of the airflow.

[0074] For example, see Figure 6The burner body has two grooves 1131, which are spaced apart along the direction of airflow. Of course, in other embodiments, the number of grooves 1131 can also be other, such as three, four or five, as needed, and is not limited here.

[0075] In one embodiment, see Figure 6 and Figure 7 The firebox 1 includes a first half-shell 12 and a second half-shell 13 arranged opposite to each other. The first half-shell 12 and the second half-shell 13 are connected and surround to form an ejector cavity 11. Both the first half-shell 12 and the second half-shell 13 are provided with grooves 1131. The grooves 1131 located in the first half-shell 12 and the grooves 1131 located in the second half-shell 13 are arranged opposite to each other or staggered. For further details, see [link to documentation]. Figure 7 In this embodiment, the first half-shell 12 and the second half-shell 13 are joined together to form the burner body. The sleeve plate 14 and the head of the burner body form an auxiliary airflow channel. The combustion gas and air are mixed in the ejector chamber 11, and the mixture is ignited at the main burner hole 15. The gas flow rate at the main burner hole 15 is relatively fast, while the gas flow rate in the auxiliary airflow channels on both sides is relatively slow, which has a flame stabilizing effect.

[0076] For example, see Figure 8 The connection point between the first half-shell 12 and the second half-shell 13 is the location of their plane of symmetry. Figure 8 The grooves 1131 on the inner surfaces of the first half-shell 12 and the second half-shell 13 are offset relative to their symmetrical planes.

[0077] Of course, in other embodiments, the grooves 1131 on the inner surfaces of the first half-shell 12 and the second half-shell 13 can also be symmetrically arranged relative to their planes of symmetry.

[0078] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0079] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A burner, characterized in that, include: Fire bar (1), wherein an ejector cavity (11) is provided inside the fire bar (1); The nozzle (2) is provided corresponding to the fire bar (1). The outlet of the nozzle (2) faces the inlet of the ejector cavity (11) and the nozzle (2) is spaced apart from the inlet of the ejector cavity (11). The center line of the nozzle (2) is higher than the center line of the inlet of the ejector cavity (11).

2. The burner according to claim 1, characterized in that, The height difference between the centerline of the nozzle (2) and the centerline of the inlet of the ejector cavity (11) is H1, 0 mm. <H1<2.5mm。 3. The burner according to claim 1, characterized in that, The ejector cavity (11) includes an inlet section (111) and an outlet section (112) that are connected at an angle, and the inlet section (111) and the outlet section (112) are connected through a transition cavity (113).

4. The burner according to claim 3, characterized in that, The wall of the transition cavity (113) is provided with at least one groove (1131).

5. The burner according to claim 4, characterized in that, The depth of the groove (1131) is greater than 2 mm.

6. The burner according to claim 4, characterized in that, The wall of the transition cavity (113) is provided with a plurality of grooves (1131), and the plurality of grooves (1131) are arranged sequentially at intervals along the flow direction of the airflow.

7. The burner according to claim 4, characterized in that, The fire bar (1) includes a first half shell (12) and a second half shell (13) arranged opposite to each other. The first half shell (12) and the second half shell (13) are connected and surround to form the ejector cavity (11). The first half shell (12) and the second half shell (13) are both provided with the groove (1131). The groove (1131) located in the first half shell (12) and the groove (1131) located in the second half shell (13) are arranged opposite to each other or staggered.

8. A gas water heater, including a combustion chamber (10), characterized in that, It also includes a burner as described in any one of claims 1-7, the burner being disposed within the combustion chamber (10).

9. The gas water heater according to claim 8, characterized in that, The gas water heater also includes a gas supply system (20), which includes a gas distribution rod (201), the output end of which extends into the combustion chamber (10), and the nozzle (2) is located at the output end of the gas distribution rod (201).

10. The gas water heater according to claim 9, characterized in that, The distance between the gas distribution bar (201) and the outer surface of the front shell (101) of the combustion chamber (10) is greater than 5 mm.

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