Gas distributor with low nitrogen emission and gas water heater

Abstract

The utility model belongs to the technical field of gas water heaters, and particularly relates to a gas distributor for realizing low nitrogen emission and a gas water heater using the distributor. The gas distributor comprises a gas ejector pipe body, the body is provided with a plurality of paired first mounting holes and second mounting holes, and the first mounting holes and the second mounting holes are used for mounting rich flame nozzles and lean flame nozzles and are arranged at intervals in the direction of the body. In addition, a first fuel gas flow channel and a second fuel gas flow channel are arranged in the direction of the main body at intervals and correspondingly communicated with at least one pair of mounting holes, and the number of pairs of mounting holes communicated with at least one flow channel is smaller than four. An electromagnetic valve is installed at the fuel gas inlet and used for accurately controlling opening and closing of different flow channels. The low-nitrogen gas distributor not only achieves low-nitrogen emission, but also has the advantages of being simple in structure, easy to process and manufacture, accurate in gas distribution and the like.

Description

Technical Field

[0001] This utility model belongs to the technical field of gas water heaters, specifically relating to a low-nitrogen emission gas distributor and a gas water heater. Background Technology

[0002] Rich-lean combustion, also known as "non-stoichiometric combustion" or "off-stoichiometric combustion," involves burning a portion of the fuel under insufficient air conditions (i.e., overly rich combustion) and another portion under excessive air conditions (i.e., overly lean combustion). Both of these combustions result in fuel-air molar ratios that deviate significantly from the theoretical molar ratio required for the chemical reaction.

[0003] 1. Rich Combustion Stage. This stage occurs under insufficient air conditions, meaning the excess air coefficient is much lower than in complete combustion. Key characteristics: Due to oxygen deficiency, the combustion temperature is higher, but less NOx is produced. This is because both temperature-related and fuel-related NOx formation decreases under insufficient air conditions.

[0004] 2. Lean combustion stage. This stage occurs under conditions of a large excess of air. Key characteristics: Due to the excess air, the combustion temperature is lower, which also suppresses NOx formation, especially temperature-dependent NOx.

[0005] 3. Mixing and Effects. Rich-lean combustion technology requires simultaneously burning two portions of fuel—one too rich and one too lean—while maintaining a constant total air volume, and then mixing them. Main effect: This staged, zoned combustion method effectively reduces NOx emissions. Experimental studies show that this rich-lean combustion method can reduce NOx emissions by approximately 30%.

[0006] Gas water heaters, as an indispensable household appliance in modern homes, have won the favor of consumers due to their high efficiency and instant hot water supply. Their core working principle lies in using the heat generated by gas combustion to quickly heat flowing cold water, thereby meeting people's daily hot water needs for bathing and washing. In this process, the gas distributor plays a crucial role. It is not only the heart of the gas water heater but also the key to ensuring efficient heat energy conversion and precise temperature control.

[0007] Gas distributors, through their precisely designed internal structure, accurately distribute gas to each combustion chamber. This process involves more than just simple gas transmission; it also involves flexibly adjusting the combustion load through the conduction and combination of different chambers to meet the hot water demand under different seasons and water usage levels, achieving precise temperature control. However, a significant problem with existing gas distributor technology is that uneven mixing of gas and air during combustion often leads to incomplete combustion, resulting in harmful gases such as nitrogen oxides. This not only affects air quality but may also pose a threat to human health. Furthermore, the high manufacturing cost is a major obstacle to its further optimization and widespread adoption. On the other hand, traditional gas distributors are designed with multiple gas flow channels supplying gas separately, and each gas flow channel typically has at least four pairs of nozzles operating simultaneously. This means that even during periods of low hot water demand, such as summer, the water heater must operate at a high base heat, resulting in excessively high outlet water temperatures and an uncomfortable bathing experience for users. Utility Model Content

[0008] In view of the shortcomings of the existing technology, this utility model provides a low-nitrogen emission gas distributor and a gas water heater.

[0009] Low-NOx gas distributors include:

[0010] The jet pipe body is provided with a plurality of first mounting holes and a plurality of second mounting holes. The first mounting holes and the second mounting holes are spaced apart along a first direction of the jet pipe body. The first mounting holes and the second mounting holes are provided in pairs and are used to install a dense flame nozzle and a light flame nozzle, respectively.

[0011] The first gas flow channel and the second gas flow channel are spaced apart along the first direction of the jet pipe body. Both are connected to at least one pair of the first mounting holes and the second mounting holes, and the number of pairs of the first mounting holes and the second mounting holes connected to at least one of them is less than 4.

[0012] A solenoid valve is installed at the gas inlet of the gas flow path to control the opening and closing of different gas flow paths.

[0013] Preferably, the low-NOx gas distributor further includes a third gas flow channel, wherein the first gas flow channel, the second gas flow channel, and the third gas flow channel are arranged in the middle along the first direction of the jet pipe body; the number of pairs of the first mounting holes and the second mounting holes that are connected to one of the three is less than or equal to 2, and the number of pairs of the remaining connected first mounting holes and the second mounting holes is greater than 2.

[0014] Preferably, the first mounting hole and the second mounting hole are arranged in a row at intervals, and the first gas flow channel, the second gas flow channel and the third gas flow channel are connected to the first mounting hole and the second mounting hole in pairs of 2, 3 and 4 respectively. The first mounting hole and the second mounting hole are on the same side of the jet pipe body and are arranged in a row at intervals along the second direction, which is perpendicular to the first direction.

[0015] Preferably, the first gas flow channel is located between the second gas flow channel and the third gas flow channel. The air inlets of the second gas flow channel and the third gas flow channel are arranged in the second direction of the jet pipe body, and the air inlets of the two are arranged in the opposite direction to the air inlet of the first gas flow channel. The air inlets of the two are respectively connected to the air outlet of the first gas flow channel through a solenoid valve.

[0016] Preferably, a process hole is provided on the main body of the jet pipe, and the first gas flow channel, the second gas flow channel and the third gas flow channel are arranged along the plane of the first direction and the second direction, and the three are also connected to the process hole, and the process hole is detachably fitted with a sealing cover.

[0017] Preferably, when the gas distributor is supplied with gas, the gas flow rate of the third gas channel is greater than that of the second gas channel, and the gas flow rate of the second gas channel is greater than that of the first gas channel.

[0018] Preferably, the inlet of the second gas flow channel is connected to the inlet of the first gas flow channel through a process hole, and a solenoid valve is installed on the process hole to achieve on / off switching; the inlet of the third gas flow channel is connected to the inlet of the first gas flow channel through another process hole, and a solenoid valve is installed on the process hole to achieve on / off switching; the diameter of the process hole in the third gas flow channel is larger than the diameter of the process hole in the second gas flow channel.

[0019] Preferably, the jet pipe body is a square tube body.

[0020] Another aspect of this utility model provides a gas water heater, which includes an air inlet pipe, a rich flame nozzle, a light flame nozzle, and a gas distributor as described above. The rich flame nozzle and the light flame nozzle are respectively installed on the first mounting hole and a plurality of second mounting holes, and the air inlet pipe is connected to the gas inlet of the gas flow channel.

[0021] Preferably, the aperture ratio of the concentrated flame nozzle and the dilute flame nozzle ranges from 0.5 to 0.82. Attached Figure Description

[0022] The above and other objects, features, and advantages of this invention will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of the invention.

[0023] Figure 1 A front view of the gas distributor provided for an embodiment;

[0024] Figure 2 for Figure 1 A structural diagram omitting the solenoid valve;

[0025] Figure 3 for Figure 2 A schematic diagram of the gas distributor from another perspective;

[0026] Figure 4 for Figure 2 A cross-sectional view of the gas distributor in the middle;

[0027] Figure 5 Numerical simulation of the gas pressure distribution on each pair of concentrated and dilute flame nozzles installed on the mounting hole;

[0028] Figure 6 for Figure 5 Test results for medium-sized samples.

[0029] Attached image labels:

[0030] Jet pipe body: 100;

[0031] First gas flow channel: a;

[0032] Second gas flow path: b;

[0033] Third gas flow channel: c;

[0034] First mounting holes: 1a, 1b, 1c;

[0035] Second mounting holes: 2a, 2b, 2c;

[0036] Solenoid valves: 3b, 3c;

[0037] Process holes: 4a, 4b, 4c;

[0038] Gas inlet: 5;

[0039] First direction: X

[0040] Second direction: Y

[0041] Solenoid valve mounting position: f. Detailed Implementation

[0042] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings.

[0043] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to and integrated with the other component, or there may be an intervening component present. The terms "mounted," "one end," "the other end," and similar expressions used in this document are for illustrative purposes only.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] In view of the shortcomings of the existing technology, this utility model provides a low-nitrogen emission gas distributor and a gas water heater.

[0046] Please refer to Figures 1 to 6 Low-NOx gas distributors include:

[0047] The jet pipe body 100 is provided with a plurality of first mounting holes (1a, 1b, 1c) and a plurality of second mounting holes (2a, 2b, 2c). The first mounting holes (1a, 1b, 1c) and the second mounting holes (2a, 2b, 2c) are all spaced apart along the first direction X of the jet pipe body 100. The diameter of the first mounting holes (1a, 1b, 1c) is the same as the diameter of the second mounting holes (2a, 2b, 2c). The first mounting holes (1a, 1b, 1c) and the second mounting holes (2a, 2b, 2c) are arranged in pairs. The diameter of the first mounting hole (1a, 1b, 1c) is the same as that of the second mounting hole (2a, 2b, 2c), and they are set in pairs for mounting a rich flame nozzle and a dilute flame nozzle respectively. Generally, the diameter of the first mounting hole (1a, 1b, 1c) is the same as that of the second mounting hole (2a, 2b, 2c), but the diameters of the rich flame nozzle and the dilute flame nozzle are different, which makes it easier to set an appropriate rich-to-dilute ratio.

[0048] A first gas flow channel a and a second gas flow channel b are spaced apart along the first direction X of the jet pipe body 100. Both are connected to at least one pair of first mounting holes (1a, 1b, 1c) and second mounting holes (2a, 2b, 2c). The number of pairs of first mounting holes (1a, 1b, 1c) and second mounting holes (2a, 2b, 2c) connected, with at least one of them connected, is less than 4. Reducing the minimum number of segments to two lowers the minimum temperature rise and improves the summer bathing experience; this design helps optimize gas distribution and improve combustion efficiency.

[0049] Solenoid valves (3b, 3c) are installed at the gas inlet 5 of the gas flow path to control the opening and closing of different gas flow paths. The rich flame nozzle and the lean flame nozzle, installed with matching mounting holes, have different orifice diameters. By precisely controlling the gas flow rate, rich and lean combustion can be achieved, further reducing nitrogen oxide emissions.

[0050] Please refer to Figures 1 to 4 In a preferred embodiment, the low-NOx gas distributor further includes a third gas flow channel c. The first gas flow channel a, the second gas flow channel b, and the third gas flow channel c are arranged along the first direction X of the jet pipe body 100. The number of pairs of first mounting holes (1a, 1b, 1c) and second mounting holes (2a, 2b, 2c) connected to one of the three is less than or equal to 2, while the number of pairs of first mounting holes (1a, 1b, 1c) and second mounting holes (2a, 2b, 2c) connected to the remaining three is greater than 2. This design can further enrich the gas distribution methods and improve combustion performance.

[0051] Please refer to Figures 1 to 4 In a preferred embodiment, the first mounting holes (1a, 1b, 1c) and the second mounting holes (2a, 2b, 2c) are arranged in a row at intervals, and are used to install a rich flame nozzle and a light flame nozzle, respectively. The first gas flow channel a, the second gas flow channel b, and the third gas flow channel c are sequentially connected to the first mounting holes (1a, 1b, 1c) and the second mounting holes (2a, 2b, 2c) in pairs, with a number of 2, 3, and 4 respectively. The first mounting holes (1a, 1b, 1c) and the second mounting holes (2a, 2b, 2c) are located on the same side of the jet pipe body 100 and are arranged in a row at intervals along the second direction Y. The first direction X, the second direction Y, and the third direction are perpendicular to each other. The first direction X is the left-right direction, the second direction Y is the up-down direction, and the third direction is the front-back direction. Further, the first mounting holes (1a, 1b, 1c) and the second mounting holes (2a, 2b, 2c) are arranged to extend front-back. The rear ends of the first mounting holes (1a, 1b, 1c) and the second mounting holes (2a, 2b, 2c) are connected to the three gas flow channels, and the front ends penetrate the front surface of the jet pipe body 100. The first, second, and third gas flow channels c are sequentially connected to different pairs of mounting holes to form a specific gas distribution pattern. At the same time, the above design makes it easier to form the jet pipe body 100.

[0052] Please refer to Figures 1 to 4In a preferred embodiment, the first gas flow channel a is located between the second gas flow channel and the third gas flow channel c. Setting it in the middle and minimizing the number of mounting holes makes it easier to open the process holes (4a, 4b, 4c) of the three gas flow channels, thus reducing the difficulty of molding design. The air inlets of the second gas flow channel and the third gas flow channel c are located on the second direction Y of the jet pipe body 100, and the air inlets of both are set in the opposite direction to the air inlet of the first gas flow channel a. This design makes it easier to utilize the space in the first direction X. The air inlets of both are respectively connected to the air outlet of the first gas flow channel a through solenoid valves (3b, 3c).

[0053] Please refer to Figures 1 to 4 In a preferred embodiment, the jet pipe body 100 is provided with process holes (4a, 4b, 4c). The first gas flow channel a, the second gas flow channel b, and the third gas flow channel c are arranged along the plane containing the first direction X and the second direction Y, and are also connected to the process holes (4a, 4b, 4c). The process holes (4a, 4b, 4c) are detachably fitted with sealing caps (not shown). The process holes (4a, 4b, 4c) on the jet pipe body 100 are connected to the first, second, and third gas flow channels c. The process holes (4a, 4b, 4c) are detachably fitted with sealing caps for easy maintenance and repair. Simultaneously, the process holes (4a, 4b, 4c) are easy to form.

[0054] Please refer to Figures 1 to 4In a preferred embodiment, when the gas distributor is supplied with gas, the flow rate of the third gas channel c is greater than that of the second gas channel b, and the flow rate of the second gas channel b is greater than that of the first gas channel a. The inlet of the second gas channel b is connected to the inlet of the first gas channel a through a process hole 4b. A solenoid valve 3b is installed on the process hole 4b, and the solenoid valve 3b is used to control the flow. The process hole 4b is located at the solenoid valve mounting position f. The inlet of the third gas channel c is connected to the inlet of the first gas channel a through another process hole 4c. A solenoid valve 3c is installed on the process hole 4c, and the solenoid valve 3c is used to control the flow. The process hole 4c is located at the solenoid valve mounting position f. Solenoid valves are installed on the two process holes (4b, 4c) located at the solenoid valve mounting position f, and the connection between the second gas channel b and the third gas channel c is completed by the opening and closing of the solenoid valves. The remaining process holes (4a, 4b, 4c) are generally sealed with sealing caps to ensure airtightness. The diameter of the process orifice 4c in the third gas flow channel is larger than the diameter of the process orifice 4b in the second gas flow channel. The inlets of the second and third gas flow channels are connected to the inlet of the first gas flow channel a through process orifices (4b, 4c), respectively. Solenoid valves (3b, 3c) are installed on these process orifices (4b, 4c), and on / off control is achieved through these solenoid valves (3b, 3c). Furthermore, the diameter of the process orifice 4c in the third gas flow channel is larger than the diameter of the process orifice 4b in the second gas flow channel to accommodate different gas flow rate requirements.

[0055] Please refer to Figures 1 to 4 In a preferred embodiment, the jet pipe body 100 is a square tube body. The square tube body 100 has a compact structure and is easy to manufacture. The orifice ratio of the rich flame nozzle and the light flame nozzle mounted on the first mounting holes (1a, 1b, 1c) and the second mounting holes (2a, 2b, 2c) ranges from 0.5 to 0.82. Figure 5 and Figure 6 The test results for rich flame nozzles and light flame nozzles using this range of values ​​are shown. This ratio helps to optimize the gas distribution effect of the nozzle and improve the effect of low nitrogen emissions.

[0056] Please refer to Figures 1 to 4 In another aspect, this utility model provides a gas water heater, which includes an inlet pipe (not shown), a rich flame nozzle (not shown), a light flame nozzle (not shown), and a gas distributor as described above. The rich flame nozzle and the light flame nozzle are respectively installed on a first mounting hole (1a, 1b, 1c) and a plurality of second mounting holes (2a, 2b, 2c). The inlet pipe is connected to the gas inlet 5 of the gas flow channel.

[0057] Technical effects of this utility model:

[0058] 1. Reduced nitrogen oxide emissions: By optimizing the design of the gas distributor, particularly by setting rich and light flame nozzles with different orifice diameters, and flexibly controlling the opening and closing of the gas flow channel, a more uniform mixture of gas and air is achieved. This design helps improve combustion efficiency and reduce harmful gases such as nitrogen oxides produced by uneven gas-air mixing, thereby improving air quality and protecting human health.

[0059] 2. Energy Saving and Consumption Reduction: The gas distributor controls the opening and closing of different gas flow channels through solenoid valves (3b, 3c), allowing for flexible adjustment of the gas supply based on actual hot water demand. Especially during periods of low hot water demand, such as summer, some gas flow channels can be closed or the number of working nozzles can be reduced, thereby lowering the base heat output and preventing excessively high water temperatures, thus achieving energy saving and consumption reduction.

[0060] 3. Enhanced User Experience: By precisely controlling the gas supply, the gas distributor can more accurately meet the user's hot water needs, avoiding discomfort caused by excessively high or low water temperatures. This improves the user's bathing experience and increases the product's market competitiveness.

[0061] 4. Reduced Costs: Although the gas distributor design incorporates control components such as solenoid valves (3b, 3c), its ability to more flexibly adjust the gas supply reduces unnecessary gas waste and excessive base heat requirements, thereby lowering overall operating costs to some extent. Simultaneously, this design also reduces maintenance and replacement costs due to incomplete combustion.

[0062] This invention can also move the gas inlet upwards; by adjusting the position and diameter of the process holes (4a, 4b, 4c), a consistent nozzle inlet pressure can be achieved, eliminating the need for core pulling and saving materials.

[0063] Please refer to Figures 1 to 6 The technical principle of this utility model is as follows:

[0064] The principle of rich-lean combustion is that the equivalence ratio in the rich flame zone is less than 1 (rich combustion), preventing the combustion temperature from reaching the maximum (equivalence ratio) temperature; the equivalence ratio in the lean flame zone is greater than 1 (lean combustion), and the excess air cools the combustion temperature. The combination of these two methods effectively reduces the combustion temperature and decreases the formation of thermal NOx. On a square tube, the upper row of nozzles are rich flame nozzles, and the lower row is a lean flame nozzle. Vertically, the pressure before the same group of rich and lean nozzles is essentially the same. By setting different nozzle orifice diameters, the purpose of rich-lean combustion is achieved.

[0065] Please refer to Figures 1 to 4The embodiment shows three gas flow channels, including a first gas flow channel a, a second gas flow channel b, and a third gas flow channel c. The first gas flow channel a has two first mounting holes 1a and two second mounting holes 2a, and a process hole 4a. The inlet of the first gas flow channel a is connected to a gas inlet 5. The second gas flow channel b consists of two gas chambers extending along a second direction Y and spaced apart along a first direction X. These two gas chambers are interconnected. The second gas flow channel b has three first mounting holes 1b and three second mounting holes 2b, and a process hole 4b. The inlet of the second gas flow channel b is connected to the outlet of the first gas flow channel a. The third gas flow channel c consists of three interconnected gas chambers, two extending along the first direction X and one extending along the second direction Y. The third gas flow channel c has four first mounting holes 1c and four second mounting holes 2c, and a process hole 4c. The inlet of the third gas flow channel c is connected to the outlet of the first gas flow channel a.

[0066] like Figure 1 The first mounting holes (1a, 1b, 1c) in the upper row are used to install rich flame nozzles; the second mounting holes (2a, 2b, 2c) in the lower row are used to install light flame nozzles. A pair of first mounting holes (1a, 1b, 1c) and a pair of second mounting holes (2a, 2b, 2c) supply gas to a pair of rich flame nozzles and a pair of light flame nozzles. The first gas passage supplies gas to two pairs (a group refers to rich flame + light flame, the same below) of rich and light flame nozzles, the second gas flow channel supplies gas to three pairs of rich and light flame nozzles, and the third gas flow channel supplies gas to four pairs of rich and light flame nozzles. Solenoid valves (3b, 3c) divide the jet pipe body 100 into three sections. The gas is supplied by... Figure 4 The gas enters the main body 100 of the jet pipe from the gas inlet 5, and then flows into the first gas passage; when the solenoid valves (3b, 3c) 1 are opened, the gas flows into the second gas passage through the process holes (4a, 4b, 4c). Figure 4 In the second gas flow channel, process holes (4a, 4b, 4c) connect the flow channels corresponding to the two sets of nozzles on the left and the flow channel corresponding to the one set of nozzles on the right. When solenoid valves (3b, 3c) 2 are open, gas flows into the third gas flow channel through the process holes (4a, 4b, 4c). The normally open section of the jet pipe body 100 contains two pairs of nozzles located in the first gas flow channel a. The solenoid valves (3b, 3c) control three pairs of nozzles, and the control end of the solenoid valves (3b, 3c) contains four pairs of nozzles. To ensure uniform pressure in front of each set of nozzles, the gas flow rate in the third channel must be greater than the gas flow rate in the second channel, which in turn must be greater than the gas flow rate in the first channel. To achieve this, the diameter of the process holes (4a, 4b, 4c) in the third gas flow channel is larger than the diameter of the process holes (4a, 4b, 4c) in the second gas flow channel to accommodate different gas flow rate requirements and to precisely control the flow rate.

[0067] Figure 5 and Figure 6The numerical calculation results and sample test results for the square tube of this patent are presented. The same inlet boundary conditions are set: gas inlet pressure 850 Pa. The average outlet pressure of each nozzle is calculated and tested. Simulation and actual tests are performed on the pressure output of each pair of rich and lean combustion nozzles, such as... Figures 2 to 4 Nine pairs of rich and lean combustion nozzles can be installed, corresponding to nine measurements taken in sequence. In the figure, the vertical axis represents the simulated and actual test pressures, and the horizontal axis represents the arrangement order of each nozzle pair. Blue represents rich flame nozzles, and red represents lean flame nozzles. The results show that the numerical calculation results and the experimental results have the same trend. Table 1 shows the statistical values ​​of the standard deviation of the outlet pressure results. The uniformity of the numerical simulation results and the sample test results is within an acceptable range.

[0068] Table 1

[0069] variance Dense flame nozzle Light flame nozzle Numerical calculation results 6.16 6.43 Sample test results 2.34 2.97

[0070] 1. Gas Distribution and Mixing: The gas distributor distributes gas to different combustion chambers through the first mounting holes (1a, 1b, 1c) and the second mounting holes (2a, 2b, 2c) on the jet pipe body 100. The rich flame nozzles and light flame nozzles installed in the first mounting holes (1a, 1b, 1c) and the second mounting holes (2a, 2b, 2c) have different orifice diameters, which helps to achieve a more uniform gas-air mixture. When the gas enters from the larger first mounting hole (1a, 1b, 1c), the mixing with air is more thorough; while when it enters from the smaller second mounting hole (2a, 2b, 2c), more precise adjustment can be achieved.

[0071] 2. Gas Flow Channel Control: Solenoid valves (3b, 3c) are installed at the gas inlet 5 of the gas flow channel. By controlling the opening and closing of different gas flow channels, the gas supply can be flexibly adjusted. This control method allows the gas distributor to adjust the gas supply according to actual needs, avoiding waste and excessive base heat.

[0072] 3. Precise Temperature Control: By precisely controlling the gas supply, the gas distributor can more accurately meet the user's hot water needs. When hot water demand is low, some gas channels can be closed or the number of working nozzles can be reduced; when hot water demand is high, more gas channels can be opened or the number of working nozzles can be increased. This flexible control method helps to achieve precise temperature control and improve the user experience.

[0073] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0074] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A low nitrogen emission gas distributor, characterized in that, The low-nitrogen emission gas distributor comprises: a jet pipe body, a plurality of first mounting holes and a plurality of second mounting holes are arranged on the jet pipe body respectively, the first mounting holes and the second mounting holes are arranged at intervals in a first direction of the jet pipe body, the first mounting holes and the second mounting holes are arranged in pairs, and the first mounting holes and the second mounting holes are used for mounting a rich flame nozzle and a lean flame nozzle respectively; a first gas flow channel and a second gas flow channel, which are arranged at intervals in the first direction of the jet pipe body, both of which correspond to at least one pair of the first mounting holes and the second mounting holes, and at least one of the first mounting holes and the second mounting holes has a number of pairs less than 4; a solenoid valve arranged at a gas inlet of the gas flow channel, used for controlling opening and closing of different gas flow channels.

2. A low-nitrogen emission gas distributor according to claim 1, characterized in that, The low-nitrogen emission gas distributor further comprises a third gas flow channel, the first gas flow channel, the second gas flow channel and the third gas flow channel are arranged at intervals in the first direction of the jet pipe body; one of the first gas flow channel, the second gas flow channel and the third gas flow channel has a number of pairs of the first mounting holes and the second mounting holes less than or equal to 2, and the remaining has a number of pairs of the first mounting holes and the second mounting holes greater than 2.

3. A low-nitrogen emission gas distributor according to claim 2, characterised in that, The first mounting holes and the second mounting holes are arranged at intervals in rows, the first gas flow channel, the second gas flow channel and the third gas flow channel sequentially communicate the first mounting holes and the second mounting holes in pairs with a number of 2, 3 and 4 respectively, the first mounting holes and the second mounting holes are arranged at intervals in rows on the same side of the jet pipe body in a second direction, and the second direction is perpendicular to the first direction.

4. A low-nitrogen emission gas distributor according to claim 3, characterised in that, The first gas flow channel is located between the second gas flow channel and the third gas flow channel, the gas inlets of the second gas flow channel and the third gas flow channel are arranged in the second direction of the jet pipe body, and the gas inlets of the second gas flow channel and the third gas flow channel are arranged in opposite directions from the gas inlet of the first gas flow channel, and the gas inlets of the second gas flow channel and the third gas flow channel are respectively communicated with the gas outlet of the first gas flow channel through solenoid valves.

5. A low-nitrogen emission gas distributor according to claim 4, characterised in that, The jet pipe body is provided with a process hole, the first gas flow channel, the second gas flow channel and the third gas flow channel are arranged in the plane of the first direction and the second direction, and the process hole is communicated with the first gas flow channel, the second gas flow channel and the third gas flow channel, and a sealing cover is detachably mounted on the process hole.

6. A low-nitrogen emission gas distributor according to claim 5, characterised in that, When the gas distributor is supplied with gas, the third gas flow channel has a gas flow greater than that of the second gas flow channel, and the second gas flow channel has a gas flow greater than that of the first gas flow channel.

7. A low-nitrogen emission gas distributor according to claim 6, characterised in that, The gas inlet of the second gas flow channel is communicated with the gas inlet of the first gas flow channel through a process hole, a solenoid valve is mounted on the process hole and the communication is realized through the solenoid valve; the gas inlet of the third gas flow channel is communicated with the gas inlet of the first gas flow channel through another process hole, a solenoid valve is mounted on the process hole and the communication is realized through the solenoid valve; the diameter of the process hole in the third gas flow channel is greater than that of the process hole in the second gas flow channel.

8. The low nitrogen emission gas distributor of claim 1, wherein, The jet pipe body is a square pipe body.

9. A gas water heater, characterised by, The gas distributor according to any one of claims 1 to 8, wherein the gas inlet pipe is connected to a gas inlet of the gas flow passage.

10. The gas water heater of claim 9, wherein, The ratio of the hole diameters of the rich flame nozzle and the lean flame nozzle is in the range of 0.5 to 0.82.

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