阅读说明：本技术 用于燃烧器的火排、燃烧器和燃气热水器 (Fire grate for burner, burner and gas water heater ) 是由 钱晓林 孟宪超 梁国荣 于 2018-06-05 设计创作，主要内容包括：本发明公开了一种用于燃烧器的火排、燃烧器和燃气热水器,火排包括火排本体,火排本体内限定出流道,流道包括彼此连通的扩张段和折射段,扩张段的横截面积逐渐增大,折射段弯折延伸,在第一平面上、扩张段的投影具有位于扩张段的中心轴线两侧的第一边线和第二边线,折射段的投影具有位于折射段的中心轴线两侧的第三边线和第四边线,第三边线和第四边线均形成为曲线段且第四边线的曲率小于第三边线的曲率,第三边线与第一边线相连、第四边线与第二边线相连,第一边线与第二边线关于扩张段的中心轴线呈非对称,其中,第一平面为火排本体的纵截面。根据本发明的用于燃烧器的火排,具有良好的引射能力,增强了燃气、空气的预混效果。(The invention discloses a fire grate for a combustor, the combustor and a gas water heater, wherein the fire grate comprises a fire grate body, a flow passage is defined in the fire grate body, the flow passage comprises an expansion section and a refraction section which are communicated with each other, the cross section area of the expansion section is gradually increased, the refraction section is bent and extended, the projection of the expansion section on a first plane is provided with a first side line and a second side line which are positioned on two sides of the central axis of the expansion section, the projection of the refraction section is provided with a third side line and a fourth side line which are positioned on two sides of the central axis of the refraction section, the third side line and the fourth side line are both formed into curve sections, the curvature of the fourth side line is smaller than that of the third side line, the third side line is connected with the first side line, the fourth side line is connected with the second side line, the first side line and the second side line are asymmetric about the central axis of the expansion section, and the first plane is a longitudinal section of the fire. The fire grate for the combustor has good ejection capacity, and enhances the premixing effect of gas and air.)

1. A fire grate for a burner comprising:

The fire grate comprises a fire grate body, a flow passage is defined in the fire grate body, the flow passage comprises an expansion section and a refraction section which are communicated with each other, the cross section area of the expansion section is gradually increased, the refraction section is bent and extended, the projection of the divergent section on the first plane has a first side line and a second side line which are positioned at two sides of the central axis of the divergent section, the projection of the refraction segment has a third side line and a fourth side line which are positioned at two sides of the central axis of the refraction segment, the third and fourth edges are each formed as a curved segment and the curvature of the fourth edge is less than the curvature of the third edge, the third sideline is connected with the first sideline, the fourth sideline is connected with the second sideline, the first sideline and the second sideline are asymmetric about the central axis of the expansion section, wherein the first plane is a longitudinal section of the fire grate body.

2. The fire grate for a burner according to claim 1, wherein the divergent section extends along a straight line, the first side line, the second side line and the central axis of the divergent section are all formed as straight line sections, the included angle between the first side line and the central axis of the divergent section is α, the included angle between the second side line and the projection of the central axis of the divergent section on a first plane is β, and α and β satisfy: alpha and beta are more than or equal to 10 degrees and less than or equal to 11 degrees.

3. A fire row for a burner as claimed in claim 2, characterised in that said α, β further satisfy: alpha is less than beta.

4. A fire grate for a burner as in claim 3, characterized in that α, β satisfy respectively: α is 4.2 ° and β is 6.4 °.

5. The fire bank for a burner of claim 2, wherein the first end of the first sideline and the first end of the second sideline are both located at the downstream end of the divergent section, the distance between the first end of the first sideline and the projection of the central axis of the divergent section onto the first plane is a, the distance between the first end of the second sideline and the projection of the central axis of the divergent section onto the first plane is b, and a and b satisfy: a is less than b.

6. A fire bank for a burner according to any one of claims 1 to 5, characterised in that the minimum value of the width of the flow channel in the second plane is x, said x satisfying: x is more than or equal to 2.9mm and less than or equal to 3.4mm, wherein the second plane is the cross section of the fire grate body.

7. the fire bank for a burner of claim 6, wherein x further satisfies: x is 3.2 mm.

8. Burner, characterized in that it comprises a fire grate for a burner according to any one of claims 1 to 7.

9. The burner of claim 8, being an atmospheric burner.

10. A gas water heater comprising a burner according to claim 8 or 9.

Technical Field

The invention relates to the technical field of water heaters, in particular to a fire grate for a burner, the burner and a gas water heater.

Background

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a fire grate for a burner, which has good ejection capability and enhances the premixing effect of gas and air.

another object of the invention is to propose a burner with the above fire row.

Still another object of the present invention is to provide a gas water heater having the above burner.

The fire grate for a burner according to an embodiment of the first aspect of the invention comprises: the fire grate comprises a fire grate body, a flow passage is defined in the fire grate body, the flow passage comprises an expansion section and a refraction section which are communicated with each other, the cross section area of the expansion section is gradually increased, the refraction section is bent and extended, the projection of the divergent section on the first plane has a first side line and a second side line which are positioned at two sides of the central axis of the divergent section, the projection of the refraction segment has a third side line and a fourth side line which are positioned at two sides of the central axis of the refraction segment, the third and fourth edges are each formed as a curved segment and the radius of curvature of the fourth edge is less than the radius of curvature of the third edge, the third sideline is connected with the first sideline, the fourth sideline is connected with the second sideline, the first sideline and the second sideline are asymmetric about the central axis of the expansion section, wherein the first plane is a longitudinal section of the fire grate body.

According to the fire grate for the combustor, the first side line and the second side line are asymmetric about the central axis of the expansion section by arranging the expansion section, so that the transition from the expansion section to the refraction section can be effectively improved, the flow resistance loss of air flow is reduced, the ejection capacity of the fire grate is enhanced, the premixing effect of gas and air is enhanced, and the uniform mixing of the gas and the air is realized. When the fire grate is applied to the combustor, can improve the ejection coefficient of combustor for the ejection coefficient of once of combustor can be maintained at 0.5 ~ 0.7, and the gas is comparatively suitable with the proportion of air, avoids producing a large amount of flue gases, guarantees that the burning is abundant, has avoided beating of flame simultaneously, has avoided the combustion noise, guarantees that the burning is ann.

According to some embodiments of the invention, the expansion section extends along a straight line, the central axes of the first side line, the second side line and the expansion section are all formed as straight line sections, the included angle between the first side line and the central axis of the expansion section is α, the included angle between the second side line and the projection of the central axis of the expansion section on the first plane is β, and α and β satisfy: alpha and beta are more than or equal to 10 degrees and less than or equal to 11 degrees.

According to some embodiments of the invention, the α, β further satisfy: alpha is less than beta.

According to some embodiments of the invention, α, β satisfy: α is 4.2 ° and β is 6.4 °.

According to some embodiments of the invention, the first end of the first sideline and the first end of the second sideline are both located at the downstream end of the expanding section, a distance between the first end of the first sideline and a projection of the central axis of the expanding section on the first plane is a, a distance between the first end of the second sideline and a projection of the central axis of the expanding section on the first plane is b, and a and b satisfy: a is less than b.

according to some embodiments of the invention, the minimum value of the width of the flow channel in the second plane is x, and x satisfies: x is more than or equal to 2.9mm and less than or equal to 3.4mm, wherein the second plane is the cross section of the fire grate body.

According to some embodiments of the invention, the x further satisfies: x is 3.2 mm.

A burner according to an embodiment of the second aspect of the invention comprises a fire bank for a burner according to the embodiment of the first aspect of the invention described above.

According to the burner provided by the embodiment of the invention, by adopting the fire grate, the injection capacity of the burner is enhanced, the injection coefficient of the burner is improved, flame is enabled to be quiet and fully combusted, and the stable and efficient operation of the burner is ensured.

According to some embodiments of the invention, the burner is an atmospheric burner.

The gas water heater according to the third aspect embodiment of the invention comprises the burner according to the second aspect embodiment of the invention.

According to the gas water heater provided by the embodiment of the invention, the burner is adopted, so that the gas water heater is stable in operation, low in noise and good in use reliability, and the experience effect of a user is improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of a fire bank for a combustor according to an embodiment of the present invention;

FIG. 2 is a schematic view of another angle configuration of the fire row shown in FIG. 1;

FIG. 3 is a cross-sectional view of the fire row shown in FIG. 1;

Fig. 4 is a schematic view of a further angle of the fire row shown in fig. 1.

Reference numerals:

100 portions of fire grate,

A fire grate body 1, a flow passage 10, a flame stabilizing sheet 2, a fire transfer sheet 21,

an expansion section 101, a first side line 101a, a second side line 101b,

A refractive segment 102, a third edge line 102a, a fourth edge line 102b,

An injection part 11, a transition part 12, a head part 13, a fire hole 13a,

A first fire grate plate 11a, a first flow path part 111, a first connecting part 112,

A second fire row plate 11b, a second flow passage part 121, and a second connecting part 122.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A fire row 100 for a burner according to an embodiment of the present invention is described below with reference to fig. 1 to 4.

As shown in fig. 1 to 4, a fire grate 100 for a burner according to an embodiment of the present invention includes a fire grate body 1.

The fire grate body 1 is internally provided with a flow passage 10, the flow passage 10 comprises an expansion section 101 and a refraction section 102 which are communicated with each other, the cross section area of the expansion section 101 is gradually increased, the refraction section 102 is bent and extended, on the first plane, the projection of the expansion section 101 has a first side line 101a and a second side line 101b which are located on two sides of the central axis of the expansion section 101, the projection of the refraction section 102 has a third side line 102a and a fourth side line 102b which are located on two sides of the central axis of the refraction section 102, the third side line 102a and the fourth side line 102b are both formed into curved line sections, the curvature of the fourth side line 102b is smaller than that of the third side line 102a, the third side line 102a is connected with the first side line 101a, the fourth side line 102b is connected with the second side line 101b, the first side line 101a and the second side line 101b are asymmetric with respect to the central axis of the expansion section 101, and the first plane is a longitudinal section of the fire grate body 1.

For example, as shown in fig. 1 to 3, the expanding section 101 may extend from front to back, a gas (e.g., a mixture of gas and air) is introduced into the flow channel 10, the cross-sectional area of the expanding section 101 gradually increases along the flow direction of the gas, the gas can be well mixed in the expanding section 101, uniform mixing of the gas and the air is ensured, and the refracting section 102 is bent and extended to form a substantially U-shaped structure.

The first side line 101a and the second side line 101b are partial edges of the projection of the expansion section 101 on the first plane, the projection of the expansion section 101 on the first plane is located between the first side line 101a and the second side line 101b, the first side line 101a is located on one side of the projection of the central axis of the expansion section 101, and the second side line 101b is located on the other side of the projection of the central axis of the expansion section 101; the third line 102a and the fourth line 102b are both partial edges of the projection of the refraction segment 102 on the first plane, the projection of the refraction segment 102 is located between the third line 102a and the fourth line 102b, the third line 102a is located on one side of the projection of the central axis of the refraction segment 102, and the fourth line 102b is located on the other side of the projection of the central axis of the refraction segment 102. The curvature of the fourth edge line 102b is smaller than that of the third edge line 102a, that is, the fourth edge line 102b is located outside the refraction section 102, the first edge line 101a is correspondingly connected with the third edge line 102a, and the second edge line 101b is correspondingly connected with the fourth edge line 102b, because the first edge line 101a and the second edge line 101b are asymmetric with respect to the central axis of the expansion section 101, the transition from the expansion section 101 to the refraction section 102 can be effectively improved, the flow resistance loss of the air flow in the process of flowing from the expansion section 101 to the refraction section 102 is reduced, the ejection capacity of the fire grate 100 is enhanced, the premixing effect of the gas and the air is enhanced, and the uniform mixing of the gas and the air is realized. When the fire grate 100 is applied to the combustor, the injection coefficient of the combustor can be improved, so that the injection coefficient of the combustor can be maintained at 0.5-0.7 once, the proportion of gas and air is appropriate, a large amount of smoke is avoided, sufficient combustion is ensured, meanwhile, the jumping of flame is avoided, the combustion noise is avoided, and the combustion is ensured to be quiet.

The first plane is a longitudinal section of the injection portion 11, that is, the first plane is a paper surface on which the structure shown in fig. 1 is located.

According to the fire grate 100 for the combustor, provided by the embodiment of the invention, the expansion section 101 is arranged, so that the first side line 101a and the second side line 101b are asymmetric about the central axis of the expansion section 101, the transition from the expansion section 101 to the refraction section 102 can be effectively improved, the flow resistance loss of airflow is reduced, the ejection capacity of the fire grate 100 is enhanced, the premixing effect of gas and air is enhanced, and the uniform mixing of the gas and the air is realized. When the fire grate 100 is applied to the combustor, the injection coefficient of the combustor can be improved, so that the injection coefficient of the combustor can be maintained at 0.5-0.7 once, the proportion of gas and air is proper, a large amount of smoke is avoided, sufficient combustion is ensured, meanwhile, the jumping of flame is avoided, the combustion noise is avoided, and the combustion is ensured to be quiet.

In some embodiments of the present invention, the expanding section 101 extends along a straight line, the central axes of the first side line 101a, the second side line 101b and the expanding section 101 are all formed as straight line segments, the included angle between the first side line 101a and the central axis of the expanding section 101 is α, the included angle between the second side line 101b and the projection of the central axis of the expanding section 101 on the first plane is β, α, β satisfy: alpha and beta are more than or equal to 10 degrees and less than or equal to 11 degrees. For example, as shown in fig. 1 and 3, the expanding section 101 may extend from front to back in a horizontal direction, the first side line 101a extends from front to back obliquely with respect to the central axis of the expanding section 101, the second side line 101b extends from front to back obliquely with respect to the central axis of the expanding section 101, the projection of the central axis of the divergent section 101 on the first plane makes an angle alpha with the first side line 101a, i.e. alpha is an upper divergence angle, the angle between the projection of the central axis of the divergent section 101 on the first plane and the second edge line 101b is beta, namely beta is a lower expansion angle, wherein alpha is more than or equal to 10 degrees and beta is less than or equal to 11 degrees, namely, the expansion angle of the expansion section 101 is between 10 and 11 degrees (including end points), thereby further enhancing the premixing effect of the fuel gas and the air in the expansion section 101, so that the gas and the air are uniformly mixed, thereby being beneficial to the stable combustion of flame on the fire grate 100.

Further, α, β further satisfy: alpha is less than beta, namely, the lower divergence angle is larger than the upper divergence angle, the lower divergence angle beta is an included angle between the projection of the central axis of the divergent section 101 on the first plane and the second side line 101b, and the second side line 101b is correspondingly connected with the fourth side line 102b, so that the curvature of the fourth side line 102b is reduced to a certain extent, the curvature radius of the fourth side line 102b is increased, the transition from the divergent section 101 to the refractive section 102 is further optimized, the flow resistance loss of the airflow in the process of flowing from the divergent section 101 to the refractive section 102 is reduced, and the ejection capacity of the fire grate 100 is further enhanced.

Optionally, α, β satisfy: alpha is 4.2 degrees and beta is 6.4 degrees, the expansion angle of the expansion section 101 is 10.6 degrees, so that the gas and the air are uniformly mixed in the expansion section 101, the flow resistance loss of the gas flow is small, and the ejection capacity of the fire grate 100 is strong.

In some embodiments of the invention, as shown in fig. 1, the first end (e.g., left end in fig. 1) of the first side line 101a and the first end (e.g., left end in fig. 1) of the second side line 101b are both located at the downstream end of the expanding section 101, a distance between the first end of the first side line 101a and a projection of the central axis of the expanding section 101 on the first plane is a, a distance between the first end of the second side line 101b and a projection of the central axis of the expanding section 101 on the first plane is b, and a and b satisfy: and a is less than b, so that the curvature of the fourth side line 102b can be reduced to a certain extent, and the curvature radius of the fourth side line 102b can be increased, so that the flow resistance loss of the airflow is reduced, and the ejection capacity of the fire grate 100 is increased.

The first end of the first sideline 101a and the first end of the second sideline 101b can be located in the same cross section of the fire grate 100, so that the expansion section 101 is simple in structure and convenient to implement; the second end (e.g., the right end as viewed in fig. 1) of the first side line 101a and the second end (e.g., the right end as viewed in fig. 1) of the second side line 101b may be located within the same cross-section of the fire grate 100 to further simplify the structure of the expanding section 101, i.e., the length of the projection of the first side line 101a on the central axis of the expanding section 101 may be equal to the length of the projection of the second side line 101 b.

Here, the "first end" and the "second end" refer to end points of the corresponding end. Alternatively, a is 7.5mm and b is 8.5 mm.

Further, the minimum value of the width of the flow channel 10 on the second plane is x, and x satisfies: x is more than or equal to 2.9mm and less than or equal to 3.4mm, wherein the second plane is the cross section of the fire grate body 1. For example, in the example of fig. 2, a plurality of fire holes 13a are formed through the tip of the fire row 100, the plurality of fire holes 13a may be sequentially spaced in the front-rear direction, each of the fire holes 13a communicates with the flow passage 10, and the air flows through the flow passage 10 and is ejected through the plurality of fire holes 13a to be burned. On the second plane, the minimum value x of the width of the flow channel 10 in the left-right direction is equal to or more than 2.9mm and equal to or less than 3.4mm, and the airflow has proper residual pressure after flowing through the position, so that the airflow can continuously overcome resistance loss in the flow channel 10, and is finally ejected from the fire holes 13a at proper necessary speed, and meanwhile, the difference of the airflow speeds at the fire holes 13a is small, which is beneficial to realizing uniform ejection of the airflow through the fire holes 13a, thereby ensuring stable and efficient operation of the fire grate 100. Wherein the second plane is a vertical plane, and the second plane is perpendicular to the front-back direction in fig. 1.

Specifically, as shown in fig. 1 to 4, the fire row body 1 may include an injection portion 11, a transition portion 12 and a head portion 13, the injection portion 11 is located at the lower portion of the fire row body 1, the head portion 13 is located at the upper end of the fire row body 1, the plurality of fire holes 13a are located at the top end of the head portion 13, and the transition portion 12 is connected between the injection portion 11 and the head portion 13; the flow channel 10 comprises a first flow channel, a second flow channel and a third flow channel which are sequentially communicated, the first flow channel comprises an expansion section 101 and a refraction section 102, the first flow channel is limited in the injection part 11, the second flow channel is limited in the transition part 12, the third flow channel is limited in the head part 13, the minimum width of the flow channel 10 in the left-right direction on the second plane is located on the second flow channel, namely, the minimum width of the second flow channel in the left-right direction on the second plane is x, and x is larger than or equal to 2.9mm and smaller than or equal to 3.4 mm. Therefore, the airflow can ensure proper static pressure in front of the head after flowing through the second flow channel, so that the airflow can overcome the resistance loss of the airflow in the third flow channel, the airflow is ensured to have reasonable outlet speed at the fire holes 13a, and meanwhile, the difference of the airflow speeds at the fire holes 13a is small, and the stable and efficient operation of the fire grate 100 is ensured. Here, it should be noted that the "static pressure before the head" refers to the static pressure when the airflow flows to the upstream end of the head 13.

Optionally, x further satisfies: x is 3.2mm, so that the static pressure of the airflow before flowing to the fire holes 13a is further ensured, and the uniform ejection of the airflow is realized.

It will be appreciated that the minimum value x of the width of the flow channel 10 in the second plane can be specifically set according to actual requirements to better adjust the speed of the air flow at the plurality of fire holes 13a and adjust the difference of the speed of the air flow at the plurality of fire holes 13 a.

A burner according to an embodiment of the second aspect of the present invention comprises a fire row 100 for a burner according to the above-described embodiment of the first aspect of the present invention. The burner may be an atmospheric burner, but is not limited thereto. When the combustor is the atmospheric type combustor, the gas is under certain pressure, with certain velocity of flow from the nozzle blowout, get into the contraction tube that breathes in, the gas is by the energy of itself intake primary air to realize the mixture of gas and primary air in drawing the portion of penetrating, then flow out through the fire hole of head and burn, form this and give birth to flame, flame is shorter, the firepower is strong, combustion temperature is high, can burn different properties's gas, it is more abundant to burn, and need not air supply equipment, good adaptability has, the needs of more technology have been satisfied better.

According to the burner provided by the embodiment of the invention, by adopting the fire grate 100, the injection capacity of the burner is enhanced, the injection coefficient of the burner is improved, flame is enabled to be quiet and fully combusted, and the stable and efficient operation of the burner is ensured.

The gas water heater according to the third aspect embodiment of the invention comprises the burner according to the second aspect embodiment of the invention.

According to the gas water heater provided by the embodiment of the invention, the burner is adopted, so that the gas water heater is stable in operation, low in noise and good in use reliability, and the experience effect of a user is improved.

Other constructions and operations of gas water heaters according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

A fire row 100 for a burner according to an embodiment of the present invention will be described in detail in one specific embodiment with reference to fig. 1 to 4. It is to be understood that the following description is only exemplary, and not a specific limitation of the invention.

As shown in fig. 1 to 4, the fire grate 100 includes a grate body 1, a flow passage 10 is defined in the grate body 1, the flow passage 10 includes an expansion section 101 and a refraction section 102 which are communicated with each other, the expansion section 101 extends linearly from front to back in a horizontal direction, the cross-sectional area of the expansion section 101 is gradually increased, and the refraction section 102 bends and extends to form a substantially U-shaped structure. Specifically, the fire grate body 1 comprises an injection part 11, a transition part 12 and a head part 13 which are sequentially arranged from bottom to top, the injection part 11 is positioned at the lower part of the fire grate body 1, the head part 13 is positioned at the upper end of the fire grate body 1, a plurality of fire holes 13a which are communicated are formed at the top end of the head part 13, each fire hole 13a is respectively communicated with the flow channel 10, and the transition part 12 is connected between the injection part 11 and the head part 13; the flow channel 10 comprises a first flow channel, a second flow channel and a third flow channel which are sequentially communicated, the first flow channel comprises an expansion section 101 and a refraction section 102, the first flow channel is defined in the injection part 11, the second flow channel is defined in the transition part 12, and the third flow channel is defined in the head part 13.

The fire grate comprises a fire grate body 1, a first fire grate plate 11a and a second fire grate plate 11b, wherein the first fire grate plate 11a and the second fire grate plate 11b are arranged opposite to each other along the left-right direction, the thickness t1 of the first fire grate plate 11a is equal to the thickness t2 of the second fire grate plate 11b, the first fire grate plate 11a comprises a first flow channel part 111 and a first connecting part 112, the first flow channel part 111 is formed by protruding a part of the first fire grate plate 11a along the direction far away from the second fire grate plate 11b, and the first flow channel part 111 and the first connecting part 112 are both positioned at the lower part of the first fire grate plate 11 a; the second fire grate plate 11b includes a second flow path portion 121 and a second connection portion 122, the second flow path portion 121 is formed by a portion of the second fire grate plate 11b protruding in a direction away from the first fire grate plate 11a, the second flow path portion 121 and the second connection portion 122 are both located at a lower portion of the second fire grate plate 11b, the first flow path portion 111 and the second flow path portion 121 together define a first flow path, and the first connection portion 112 and the second connection portion 122 are both formed in a flat plate structure. Two bulges are arranged on the first connecting part 112, two grooves are correspondingly formed on the second connecting part 122, the two bulges are respectively clamped in the two grooves in a one-to-one correspondence manner, each bulge and the corresponding groove are simultaneously punched and formed, the height of each bulge is equal to the depth of the corresponding groove, and therefore the first connecting part 112 is tightly attached to the second connecting part 122.

As shown in FIG. 2, the minimum value of the width of the second flow passage in the left-right direction on the second plane is x, x satisfies 2.9 mm. ltoreq. x.ltoreq.3.4 mm, that is, the minimum value of the width of the transition portion 12 in the left-right direction on the second plane is x + t1+ t 2. Alternatively, x is 3.2mm, t1 is t2 is 0.3 mm.

On the first plane, the projection of the expanding section 101 has a first side line 101a and a second side line 101b which are positioned at two sides of the central axis of the expanding section 101, the first side line 101a is positioned at the upper side of the central axis of the expanding section 101, the second side line 101b is positioned at the lower side of the central axis of the expanding section 101, the projection of the refracting section 102 has a third side line 102a and a fourth side line 102b which are positioned at two sides of the central axis of the refracting section 102, the third side line 102a and the fourth side line 102b are both formed into arc line segments, the curvature of the fourth side line 102b is smaller than that of the third side line 102a, the third side line 102a is directly connected with the first side line 101a, the fourth side line 102b is directly connected with the second side line 101b, the central axes of the first side line 101a, the second side line 101b and the expanding section 101 are all formed into straight line segments, the first side line 101a and the second side line 101b are asymmetric about the, and an included angle alpha between the first side line 101a and the central axis of the expansion section 101 and an included angle beta between the second side line 101b and the projection of the central axis of the expansion section 101 on the first plane satisfy that alpha is more than or equal to 10 degrees and beta is more than or equal to 11 degrees, and alpha is less than beta. Wherein, the first plane is a longitudinal section of the fire grate body 1; α is 4.2 ° and β is 6.4 °.

As shown in fig. 1 and 3, the first end (e.g., left end as in fig. 1) of the first edge 101a and the first end (e.g., left end as in fig. 1) of the second edge 101b are both located at the downstream end of the expanding section 101, and the first end of the first edge 101a and the first end of the second edge 101b are located within the same cross-section of the fire bank 100, and the second end (e.g., right end as in fig. 1) of the first edge 101a and the second end (e.g., right end as in fig. 1) of the second edge 101b may be located within the same cross-section of the fire bank 100, and a distance a between the first end of the first edge 101a and a projection of the central axis of the expanding section 101 onto the first plane is smaller than a distance b between the first end of the second edge 101b and a projection of the central axis of the expanding section 101 onto the first plane. Wherein, a is 7.5mm, b is 8.5 mm.

The left side and the right side outside the fire grate body 1 are respectively provided with the flame stabilizing pieces 2, each flame stabilizing piece 2 can be roughly formed into a plate-shaped structure, each flame stabilizing piece 2 can be fixedly connected with the fire grate body 1 in a spot welding mode, the lower end of each flame stabilizing piece 2 can be tightly attached to the fire grate body 1, the front end and the rear end of each flame stabilizing piece 2 are tightly attached to the fire grate body 1, and the upper part of each flame stabilizing piece 2 is arranged at intervals with the fire grate body 1, so that a channel communicated with the channel 10 is defined between each flame stabilizing piece 2 and the fire grate body 1, and the flame stabilizing pieces 2 can play a flame stabilizing role in flame at the fire holes 13 a; wherein, still be formed with on every steady flame piece 2 towards keeping away from the fire and arrange the piece 21 of passing a fire that body 1 center extended to reduce the flame distance between two adjacent fire rows 100, made things convenient for the biography fire between the adjacent fire row 100, realize that stable, quick biography fire between the adjacent fire row 100.

According to the fire grate 100 for the combustor, provided by the embodiment of the invention, the transition from the expansion section 101 to the refraction section 102 is effectively improved, and the flow resistance loss of airflow is reduced, so that the ejection capacity of the fire grate 100 is enhanced, the premixing effect of gas and air is enhanced, and the uniform mixing of the gas and the air is realized. When the fire grate 100 is applied to a combustor, the injection coefficient of the combustor can be improved, so that the one-time injection coefficient of the combustor can be maintained at about 0.6, the ratio of gas to air is optimal, a large amount of smoke is avoided, sufficient combustion is ensured, meanwhile, the jumping of flame is avoided, the combustion noise is avoided, and the quiet combustion is ensured.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.