Fire grate, burner and gas water heater

Abstract

The utility model relates to a fire grate, a combustor and a gas water heater, the fire grate comprises an injection pipe section, and the axis of the injection pipe section is parallel to the horizontal plane in the height direction of the fire grate; the injection pipe section comprises an air inlet section and a diffusion section; in the airflow direction, the air inlet section and the diffusion section are sequentially communicated, and the circulation cross-sectional area of the diffusion section is gradually increased in the airflow direction. The intersecting lines of the longitudinal section, in the height direction of the fire grate, of the diffusion section and the inner wall of the diffusion section comprise a first intersecting line and a second intersecting line, the first intersecting line is located above the second intersecting line, an included angle alpha is formed between the first intersecting line and the axis of the injection pipe section, an included angle beta is formed between the second intersecting line and the axis of the injection pipe section, and alpha < gt > is larger than alpha < gt >; beta. Pressure and speed distribution at the head outlet of the fire grate is more uniform, and stable and efficient operation of the burner is guaranteed. In other words, the defects that in the prior art, due to the fact that fuel gas deviates downwards, fuel gas is asymmetrically distributed in the injection pipe section, smoke exceeds the standard, and combustion flames are not uniform can be overcome.

Description

Technical Field

[0001] The present application relates to the technical field of burners, and in particular to a fire grate, a burner and a gas water heater. Background Art

[0002] With the rapid development of gas water heaters, they are used more and more widely in life, and various types of gas water heaters such as forced extraction type, direct exhaust type, forced exhaust type, condensing type, balanced type, etc. have emerged. The gas water heater includes a burner, which is composed of multiple fire grates assembled side by side; along the direction of air flow, the fire grate has an ejector pipe section, a connecting section and a mixing section that are connected in sequence, and the nozzle of the gas distribution pipe is opposite to the air inlet of the ejector pipe section. The ejector pipe section is usually set to a structure symmetrically designed along its central axis. When in use, the fire grate is installed inside the gas water heater, and the gas outlet direction of the fire grate mixing section is usually set upward. In the process of the gas distribution pipe injecting the gas into the ejector pipe section, the primary air around the ejector pipe section can be simultaneously drawn into the ejector pipe section and mixed with the gas to obtain mixed gas. The mixed gas flows to the outlet of the mixing section after passing through the connecting section for combustion.

[0003] In the existing gas water heater structure, the air outlet direction of the fire grate is set upward along the height direction of the gas water heater, and the axis of the fire grate ejector pipe section is set parallel to the horizontal plane. The primary air enters from below the fire grate and is affected by the obstruction of the gas distribution pipe. The primary air entering from above the inlet of the ejector pipe section is less and the flow rate is slower, while the primary air entering from below the inlet of the ejector pipe section is more and the flow rate is faster. The primary air entering from below the ejector pipe section is more and the flow rate is faster. According to Bernoulli's principle, the pressure below the ejector pipe section is less than the pressure above, and the gas ejected from the nozzle of the gas distribution pipe is driven downward by the primary air, so that the gas and primary air are not fully mixed, thereby causing incomplete combustion of the gas, resulting in adverse effects such as excessive nitrogen oxides in the flue gas and uneven flames. Utility Model Content

[0004] The first technical problem solved by the present application is to provide a fire grate that can effectively make the gas and air mix more fully, reduce the adverse effects of incomplete combustion of gas leading to excessive nitrogen oxides in flue gas, uneven flames, etc.

[0005] The second technical problem solved by the present application is to provide a burner that can effectively mix the gas and air more fully, reduce the adverse effects caused by incomplete combustion of the gas, such as excessive nitrogen oxides in the flue gas and uneven flames.

[0006] The third technical problem solved by the present application is to provide a gas water heater that can effectively mix the gas and air more fully, reduce the adverse effects caused by incomplete combustion of the gas, such as excessive nitrogen oxides in the flue gas and uneven flames.

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

[0008] A fire grate, comprising an ejector pipe section, wherein the axis of the ejector pipe section is parallel to a horizontal plane along the height direction of the fire grate; the ejector pipe section comprises an air intake section and a pressure diffuser section; along the airflow direction, the air intake section and the pressure diffuser section are sequentially connected, and the flow cross-sectional area of the pressure diffuser section gradually increases along the airflow direction;

[0009] The lines where the longitudinal section of the diffuser section along the height direction of the fire bar intersects with the inner wall of the diffuser section include a first intersection line and a second intersection line, the first intersection line is located above the second intersection line, the first intersection line forms an angle α with the axis of the ejector pipe section, and the second intersection line forms an angle β with the axis of the ejector pipe section, wherein α>β.

[0010] The fire grate described in this application has the following beneficial effects compared with the background technology:

[0011] In the above-mentioned fire grate, since α>β, that is, the ejector section is an asymmetric ejector structure, compared with the symmetrical ejector structure in the related art, when the primary air is mixed and enters the diffuser section, the flow resistance above the diffuser section is smaller than the flow resistance below the diffuser section, so that more primary air flows to the top of the ejector section, reducing the effect of the obstruction of the gas distribution pipe and the less primary air above the ejector section, which is conducive to uniform distribution of gas, achieving full mixing of gas and air, and then making the gas fully burn. The pressure and velocity distribution at the head outlet of the fire grate is more uniform, ensuring stable and efficient operation of the burner. In other words, it can avoid the defect of asymmetric distribution of gas in the ejector section due to the downward deviation of gas in the related art, which leads to excessive nitrogen oxides in the flue gas and uneven combustion flame.

[0012] In one embodiment, 6°<α<12°, and / or, 4°<β<8°.

[0013] In one embodiment, 8°<α<10°, and / or 5°<β<7°.

[0014] In one embodiment, the flow cross-sectional area of the air intake section gradually decreases along the air intake direction.

[0015] In one embodiment, an air inlet is formed at one end of the air inlet section away from the diffuser section, a throat is formed at one end of the air inlet section connected to the diffuser section, and the ratio of the flow cross-sectional area at the air inlet to the flow cross-sectional area at the throat is 2 to 3.

[0016] In one embodiment, the ratio of the flow cross-sectional area at the air inlet to the flow cross-sectional area at the throat is 2.4 to 2.6.

[0017] In one embodiment, the fire bar further includes a connecting section and a mixing section; along the airflow direction, the ejector pipe section, the connecting section and the mixing section are connected in sequence.

[0018] In one embodiment, the connecting section is curved and connects the ejector tube section and the mixing section, and the ejector tube section and the mixing section are located on the same side of the connecting section.

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

[0020] A burner comprises the fire grate.

[0021] The burner described in this application has the following beneficial effects compared with the background technology:

[0022] In the burner described above, since α>β, that is, the ejector section is an asymmetric ejector structure, compared to the symmetrical ejector structure in the related art, when the primary air is mixed and enters the diffuser section, the flow resistance above the diffuser section is smaller than the flow resistance below the diffuser section, so that more primary air flows to the top of the ejector section, reducing the effect of the obstruction of the gas distribution pipe and the less primary air above the ejector section, which is beneficial to uniformly distribute the gas and achieve full mixing of the gas and air, thereby enabling the gas to be fully burned, and the pressure and velocity distribution at the head outlet of the fire grate is more uniform, ensuring stable and efficient operation of the burner. That is, it can avoid the defect of asymmetric distribution of gas in the ejector section due to the downward deviation of the gas in the related art, which leads to excessive nitrogen oxides in the flue gas and uneven combustion flames.

[0023] The third technical problem mentioned above is solved by the following technical solution:

[0024] A gas water heater comprises the burner.

[0025] The gas water heater described in this application has the following beneficial effects compared with the background technology:

[0026] In the above-mentioned gas water heater, since α>β, that is, the ejector section is an asymmetric ejector structure, compared with the symmetrical ejector structure in the related art, when the primary air is mixed and enters the diffuser section, the flow resistance above the diffuser section is smaller than the flow resistance below the diffuser section, so that more primary air flows to the top of the ejector section, reducing the impact of the obstruction of the gas distribution pipe and the less primary air above the ejector section, which is conducive to uniform distribution of gas and full mixing of gas and air, thereby making the gas fully burned, and the pressure and velocity distribution at the head outlet of the fire grate more uniform, ensuring stable and efficient operation of the burner. That is, it can avoid the defect of asymmetric distribution of gas in the ejector section due to the downward deviation of gas in the related art, which leads to excessive nitrogen oxides in the flue gas and uneven combustion flame. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0029] Figure 1 This is a structural diagram of a fire bar according to an embodiment of the present application.

[0030] Figure 2 for Figure 1 Front view of the structure shown.

[0031] Figure 3 1 is a diagram showing the molar concentration distribution of methane in different main burner holes with different sizes of α and β according to an embodiment.

[0032] Figure 4 Schematic diagram of the air coefficient distribution of different fire holes when the ratio of the flow cross-sectional area at the air inlet to the flow cross-sectional area at the throat of a fire grate in one embodiment is different.

[0033] Reference numerals:

[0034] 10. Fire grate; 11. Ejector pipe section; 111. Air inlet section; 1111. Air inlet; 1112. Throat; 112. Diffuser section; 12. Connecting section; 13. Mixing section; 14. First intersection line; 15. Second intersection line; 16. Top. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] As described in the background art, the pressure and velocity distribution of the gas mixture at the head outlet of the fire grate in the related art is uneven, and the gas and air are not mixed sufficiently, resulting in incomplete combustion of the gas, causing excessive smoke, uneven flames and other adverse effects. The inventors have found that the reason for this problem is that, due to the installation of the burner, the speed and flow of the surrounding air when entering the fire grate inlet of the burner are uneven; due to the obstruction of the gas distribution pipe, less primary air enters the area above the central axis of the ejector pipe section 11, and relatively more air enters the area below the central axis of the ejector pipe section 11. More air enters the lower part of the ejector pipe section 11 and the flow rate is faster. According to Bernoulli's principle, the pressure at the lower part of the ejector pipe section is lower than the pressure at the upper part. The gas ejected from the gas distribution pipe nozzle is driven downward by the primary air, and the area below the central axis of the ejector pipe section 11 enters relatively more air and mixes with the jet gas earlier, resulting in an asymmetrical distribution of gas in the ejector pipe section 11. The symmetrical design of the ejector pipe section 11 along the central axis will further make the gas-air mixture more uneven, increase the resistance loss, affect the ejection effect, and thus cause excessive smoke and uneven combustion flames.

[0037] Based on the above reasons, the present application provides a fire grate, a burner and a gas water heater, which can make the gas and air mix more fully and the pressure and velocity distribution at the head outlet of the fire grate more uniform.

[0038] See Figure 1 and Figure 2 , Figure 1 A schematic structural diagram of a fire bar according to an embodiment of the present application is shown. Figure 2 Shown Figure 1The front view of the structure shown. An embodiment of the present application provides a fire grate, comprising an ejector pipe section 11; along the height direction of the fire grate 10, the axis of the ejector pipe section 11 is parallel to the horizontal plane; the ejector pipe section 11 comprises an air intake section 111 and a diffuser section 112 that are interconnected. Along the airflow direction, the air intake section 111 and the diffuser section 112 are sequentially connected, and the flow cross-sectional area of the diffuser section 112 gradually increases along the airflow direction. The line where the longitudinal section of the diffuser section 112 along the height direction of the fire grate 10 intersects with the inner wall of the diffuser section 112 comprises a first intersection line 14 and a second intersection line 15. The first intersection line 14 is located above the second intersection line 15, and the first intersection line 14 forms an angle α with the axis P of the ejector pipe section 11, and the second intersection line 15 forms an angle β with the axis P of the ejector pipe section 11, wherein α>β.

[0039] Optionally, the fire bar 10 further includes a connecting section 12 and a mixing section 13. Along the airflow direction, the ejector section 11, the connecting section 12 and the mixing section 13 are connected in sequence.

[0040] See also Figure 1 and Figure 2 In some embodiments, an air inlet 1111 is provided at one end of the air inlet section 111 away from the diffuser section 112. During use, the gas is sprayed from the nozzle of the gas distribution pipe to the air inlet 1111, and then enters the air inlet section 111 through the air inlet 1111. Simultaneously, the air surrounding the air inlet 1111 is drawn into the interior of the air inlet section 111 for preliminary mixing with the gas. The air then enters the diffuser section 112, the connecting section 12, and the mixing section 13 in sequence, and finally burns at the fire hole at the top 16 of the fire grate to form a flame.

[0041] In the above-mentioned fire grate, since α>β, that is, the ejector pipe section 11 is an asymmetric ejector structure, compared with the symmetrical ejector structure in the related art, when the primary air is mixed and enters the diffuser section, the flow resistance above the diffuser section is less than the flow resistance below the diffuser section, so that more primary air flows to the top of the ejector pipe section 11, reducing the impact of the obstruction of the gas distribution pipe resulting in less primary air above the ejector pipe section, which is conducive to uniform distribution of gas, achieving full mixing of gas and air, and then making the gas fully burn. The pressure and velocity distribution at the head outlet of the fire grate is more uniform, ensuring stable and efficient operation of the burner. In other words, it can avoid the defect of asymmetric distribution of gas in the ejector pipe section 11 caused by the downward deviation of gas in the related art, which leads to excessive nitrogen oxides in the flue gas and uneven combustion flames.

[0042] See also Figure 1 and Figure 2In one embodiment, 6°<α<12°, and / or, 4°<β<8°. In this way, the size settings of α and β are relatively appropriate, which can achieve a more uniform distribution of the molar concentration of the gas in the main fire hole of the fire grate, achieve full combustion of the gas, and make the pressure and velocity distribution at the head outlet of the fire grate more uniform, thereby ensuring stable and efficient operation of the burner. In addition, when β is too small, the gas deflects downward and is more likely to hit the lower wall, resulting in excessive resistance to the mixed gas, which affects the effect of entraining air; when β is too large, the downward deviation of the gas in the ejector pipe section 11 is aggravated, resulting in uneven distribution of the gas and air at the head, and ultimately worsening the mixing effect of the gas and air. In addition, when α is too small, the downward deviation of the mixed gas is aggravated, and the distribution of the gas and air at the head is uneven. When α is too large, the resistance loss of the mixed gas increases.

[0043] In some embodiments, α includes but is not limited to various angles such as 6.5°, 7°, 7.5°, 8°, 8.5°, 9°, 10.5°, 11°, 11.5°, etc., and can be flexibly adjusted and set according to actual needs, and is not limited here.

[0044] In some embodiments, β includes but is not limited to various angles such as 4.5°, 5°, 5.5°, 6°, 6.5°, 7°, 7.5°, etc., and can be flexibly adjusted and set according to actual needs and is not limited here.

[0045] Of course, as some optional solutions, α can also be set to any value less than 6° and greater than 12°, and β can also be any value less than 4° and greater than 8°, as long as a>β is satisfied.

[0046] See also Figure 3 , Figure 3 The methane molar concentration distribution of each main fire hole of the fire grate when α=9° and β=6° is shown as curve S1; and the methane molar concentration distribution of each main fire hole of the fire grate when α=3° and β=3° is shown as curve S2. Figure 3 It can be seen that the methane molar concentration distribution of the main fire hole when α=9° and β=6° is more uniform than that when α=3° and β=3°.

[0047] In one embodiment, 8°<α<10°, and / or, 5°<β<7°.

[0048] In one embodiment, the air inlet section 111 includes but is not limited to a contraction section. Specifically, the flow cross-sectional area of the air inlet section 111 gradually decreases along the air inlet direction. In this way, the ejection capacity of the ejector tube section 11 can be improved.

[0049] See also Figure 1 and Figure 2In one embodiment, an air inlet 1111 is formed at one end of the air inlet section 111 away from the diffuser section 112, and a throat 1112 is formed at the end of the air inlet section 111 connected to the diffuser section 112. The ratio of the flow cross-sectional area at the air inlet 1111 to the flow cross-sectional area at the throat 1112 includes, but is not limited to, 2 to 3, specifically, for example, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, etc. In this way, the ratio of the flow cross-sectional area at the air inlet 1111 to the flow cross-sectional area at the throat 1112 is set to a relatively appropriate value, which not only ensures that the ejector pipe section 11 has a large ejection capacity, but also reduces the resistance loss when air enters.

[0050] See also Figure 4 , Figure 4 The air coefficient distribution diagram is shown when the ratio of the flow cross-sectional area at the air inlet 1111 of the fire grate to the flow cross-sectional area at the throat 1112 is 2.2 and 3.2. When the ratio is 2.2, the corresponding value is as follows: Figure 4 The curve S3 in the figure has a ratio of 3.2, which corresponds to the following: Figure 4 Curve S4 in Figure 4 It can be seen that the air coefficient of each fire hole when the ratio of the flow cross-sectional area at the air inlet 1111 to the flow cross-sectional area at the throat 1112 is 2.2 is greater than the air coefficient of each fire hole when the ratio of the flow cross-sectional area at the air inlet 1111 to the flow cross-sectional area at the throat 1112 is 3.2, that is, when the flow cross-sectional area of the throat 1112 is too small, the air coefficient is low.

[0051] In one embodiment, the ratio of the flow cross-sectional area at the air inlet 1111 to the flow cross-sectional area at the throat 1112 is, for example, 2.4 to 2.6.

[0052] In one embodiment, the connecting section 12 is curved and connects the ejector tube section 11 and the mixing section 13 , and the ejector tube section 11 and the mixing section 13 are located on the same side of the connecting section 12 .

[0053] In one embodiment, a burner is provided, and the burner includes the fire bar according to any one of the above embodiments.

[0054] In the burner described above, since α>β, that is, the ejector section 11 is an asymmetric ejector structure, compared to the symmetrical ejector structure in the related art, when the primary air is mixed and enters the diffuser section, the flow resistance above the diffuser section is less than the flow resistance below the diffuser section, thereby allowing more primary air to flow above the ejector section 11, reducing the effect of less primary air above the ejector section due to the obstruction of the gas distribution pipe, thereby facilitating uniform distribution of gas, achieving full mixing of gas and air, and further enabling full combustion of gas, making the pressure and velocity distribution at the head outlet of the fire grate more uniform, and ensuring stable and efficient operation of the burner. In other words, it can avoid the defect of asymmetric distribution of gas in the ejector section 11 caused by the downward deviation of gas in the related art, thereby causing excessive nitrogen oxides in the flue gas and uneven combustion flames.

[0055] In some embodiments, the number of fire bars is not limited to one, and can be multiple, for example, with each fire bar arranged in parallel and spaced apart.

[0056] In one embodiment, a gas water heater includes the burner according to any one of the above embodiments.

[0057] In the above-mentioned gas water heater, since α>β, that is, the ejector pipe section 11 is an asymmetric ejector structure, compared with the symmetrical ejector structure in the related art, when the primary air is mixed and enters the diffuser section, the flow resistance above the diffuser section is less than the flow resistance below the diffuser section, so that more primary air flows to the top of the ejector pipe section 11, reducing the impact of the obstruction of the gas distribution pipe and the resulting lack of primary air above the ejector pipe section, which is conducive to uniform distribution of gas, achieving full mixing of gas and air, and then making the gas fully burn, and the pressure and velocity distribution at the head outlet of the fire grate more uniform, ensuring stable and efficient operation of the burner. In other words, it can avoid the defect of asymmetric distribution of gas in the ejector pipe section 11 caused by the downward deviation of gas in the related art, which leads to excessive nitrogen oxides in the flue gas and uneven combustion flames.

[0058] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0059] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0060] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0061] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0062] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0063] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A fire bar, comprising an ejector pipe section (11), wherein along the height direction of the fire bar (10), the axis of the ejector pipe section (11) is parallel to the horizontal plane; characterized in that: The ejector section (11) includes an air intake section (111) and a diffuser section (112); along the airflow direction, the air intake section (111) and the diffuser section (112) are sequentially connected, and the flow cross-sectional area of the diffuser section (112) gradually increases along the airflow direction; The line where the longitudinal section of the diffuser section (112) along the height direction of the fire bar (10) intersects with the inner wall of the diffuser section (112) includes a first intersection line (14) and a second intersection line (15), wherein the first intersection line (14) is located above the second intersection line (15), the first intersection line (14) forms an angle α with the axis of the ejector tube section (11), and the second intersection line (15) forms an angle β with the axis of the ejector tube section (11), wherein α>β.

2. The fire bar according to claim 1, characterized in that: 6°<α<12°, and / or, 4°<β<8°.

3. The fire bar according to claim 2, characterized in that: 8°<α<10°, and / or, 5°<β<7°.

4. The fire bar according to claim 1, characterized in that: The flow cross-sectional area of the air inlet section (111) gradually decreases along the air flow direction.

5. The fire bar according to claim 4, characterized in that: An air inlet (1111) is formed at one end of the air inlet section (111) away from the diffuser section (112), and a throat (1112) is formed at one end of the air inlet section (111) connected to the diffuser section (112). The ratio of the flow cross-sectional area at the air inlet (1111) to the flow cross-sectional area at the throat (1112) is 2 to 3.

6. The fire bar according to claim 5, characterized in that: The ratio of the flow cross-sectional area at the air inlet (1111) to the flow cross-sectional area at the throat (1112) is 2.4 to 2.

6.

7. The fire bar according to claim 1, characterized in that: It also includes a connecting section (12) and a mixing section (13); along the airflow direction, the ejector tube section (11), the connecting section (12) and the mixing section (13) are connected in sequence.

8. The fire bar according to claim 7, characterized in that: The connecting section (12) is curved and connects the ejector tube section (11) and the mixing section (13), and the ejector tube section (11) and the mixing section (13) are located on the same side of the connecting section (12).

9. A burner, characterized in that: The burner comprises a fire bar (10) according to any one of claims 1 to 8.

10. A gas water heater, characterized in that: The gas water heater includes the burner according to claim 9.

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