CN219160634U - Fire row assembly, burner and gas water heating equipment - Google Patents

Abstract

The utility model belongs to the technical field of gas equipment, and discloses a fire grate assembly, a burner and gas water heating equipment. The fire grate assembly comprises a fire grate main body, a fire-retarding plate and a top plate, wherein the fire-retarding plate is provided with a plurality of slits, the slits are sequentially arranged along the length direction of the fire-retarding plate, the width W1 of each slit is smaller than the minimum quenching diameter of flame formed by firing of tempering limit gas at the gas feeding temperature, and the height H of the slit is larger than the quenching distance of flame formed by firing of the tempering limit gas at the gas feeding temperature. According to the fire grate assembly, the plurality of slits are formed in the fire-retarding plate, so that tempering is avoided, and equipment damage or personal injury caused by tempering is avoided.

Description

Fire row assembly, burner and gas water heating equipment

Technical Field

The utility model relates to the technical field of gas equipment, in particular to a fire grate assembly, a burner and gas water heating equipment.

Background

The fire row assembly is commonly used for a combustor of a gas water heating device, the fire row assembly comprises a plurality of fire row pieces which are arranged side by side, each fire row piece is provided with an air inlet end, an air outlet end and an air flow channel, fuel gas with certain pressure introduces primary air into the fire row from the air inlet end, the primary air enters the air outlet end after passing through the air flow channel, the air outlet end covers a top plate, and a plurality of rows of fire holes are formed in the top plate. The mixture of gas and air burns over the fire holes, mixing the secondary air to form a double flame, while giving off heat to heat the cold water to hot water.

Flashback may occur when the combustion speed of the gas is greatly increased or the speed of the gas-air mixture is greatly reduced. Such as: the gas composition is greatly changed, and more gas with high combustion speed is mixed in the gas with low combustion speed; the excess air ratio of combustion is greatly changed, such as conversion from oxygen-lean combustion to equivalence ratio combustion; the fan is in operation accident or the air pipeline is blocked by dust carried in the air. Tempering accidents can cause damage to equipment and harm to personal safety.

Disclosure of Invention

One of the technical problems to be solved by the utility model is to provide a fire grate assembly which can effectively solve the tempering problem of a fire grate type burner.

The second technical problem to be solved by the utility model is to provide a burner which can effectively solve the tempering problem of the fire grate component.

The third technical problem to be solved by the utility model is to provide a gas water heating device which can effectively solve the tempering problem of the adopted fire grate component.

The first technical problem is solved by the following technical scheme:

a fire grate assembly comprising:

a fire grate body having an inlet end and an outlet end, the inlet end and the outlet end being in communication via an airflow passage;

the fire-retardant plate is arranged at the outlet end of the fire-retardant plate main body, the fire-retardant plate is provided with a plurality of slits, the slits are sequentially arranged along the length direction of the fire-retardant plate, the width W1 of each slit is smaller than the minimum quenching diameter of flame formed by firing of tempering limit gas at the gas feeding temperature, and the height H of each slit along the gas flow direction is larger than the quenching distance of flame formed by firing of tempering limit gas at the gas feeding temperature.

Compared with the background technology, the fire grate assembly has the beneficial effects that:

the fire grate assembly comprises a fire grate main body and a fire grate plate, wherein a plurality of slits are arranged on the fire grate plate, the width W1 of each slit is smaller than the minimum quenching diameter of a flame formed by firing of tempering limit gas at an air supply temperature, the height H along the air flow direction is larger than the quenching distance of the flame formed by firing of the tempering limit gas at the air supply temperature, under the slit parameters, the flame in the fire grate plate is divided into small flames in the plurality of slits, after the flame is extinguished, the flame temperature is reduced due to heat conduction, active free radicals which maintain burning are annihilated in collision with solid wall surfaces between the slits, so that the flame is extinguished due to incapacity of maintaining, and tempering caused by automatic ignition is avoided. Therefore, the fire-retardant plate structure of the utility model avoids tempering through limiting the width and the height of the slit, thereby avoiding equipment damage or personal injury caused by tempering.

In one embodiment, the width W1 of the slit is 0.2mm-0.6mm;

and/or, the minimum distance between two adjacent slits is 0.1mm-1mm;

and/or the height H of the slit along the air flow direction is not less than 10mm.

In one embodiment, the fire-retardant plate comprises a plurality of slit plates, wherein the slit plates are mutually parallel and uniformly spaced, and a gap between two adjacent slit plates forms the slit.

In one embodiment, the firestop plate further comprises a partition plate disposed within the slit, the partition plate partitioning the slit into a plurality of voids along a width direction of the slit plate.

In one embodiment, the partition plate is arranged in a corrugated manner, and along the width direction of the fire-retardant plate, the partition plate and the slit plate are enclosed to form a plurality of hollow triangular prism structures.

In one embodiment, the thickness d2 of the partition plate is 0.1mm to 1mm, and/or the height of the partition plate in the air flow direction is not less than 10mm.

In one embodiment, the length L2 of the smallest side length of the triangular prism structure is 0.2-0.6mm.

In one embodiment, the fire grate assembly further comprises a top plate, the fire-retardant plate is clamped between the top plate and the fire grate main body to be fixed, the top plate is provided with a plurality of fire holes, a plurality of fire holes are arranged in a plurality of rows along the length direction of the top plate, and a plurality of rows of fire holes are respectively arranged right above the slits along the width direction of the top plate.

The second technical problem is solved by the following technical scheme:

a burner comprising a fire grate assembly as described in any one of the embodiments above.

Compared with the background technology, the burner provided by the utility model has the beneficial effects that:

according to the burner, the slit is arranged on the fire-retarding plate, so that the tempering problem is effectively solved, and equipment damage or personal injury caused by tempering is avoided.

The third technical problem is solved by the following technical scheme:

a gas water heating apparatus comprising a burner as described in the above embodiments.

Compared with the background technology, the gas water heating equipment has the following beneficial effects:

according to the gas water heating equipment, the slit is arranged on the fire-retarding plate by adopting the burner and the fire-retarding assembly thereof, so that the tempering problem is effectively solved, and further equipment damage or personal injury caused by tempering is avoided.

Drawings

FIG. 1 is a schematic view of an exploded view of a fire grate assembly according to a first embodiment of the present utility model;

FIG. 2 is an enlarged schematic view of area A of FIG. 1;

FIG. 3 is an enlarged schematic view of area B of FIG. 1;

FIG. 4 is a top view of a firestop plate in a firestop assembly according to one embodiment of the utility model;

FIG. 5 is a cross-sectional view A-A of FIG. 4;

FIG. 6 is an enlarged schematic view of area C of FIG. 5;

FIG. 7 is a front view of a firestop plate in a firestop assembly according to a second embodiment of the present utility model;

FIG. 8 is a cross-sectional view B-B of FIG. 7;

fig. 9 is an enlarged schematic view of the region D in fig. 8.

Description of the reference numerals:

1. a fire grate main body; 11. an inlet end; 12. an outlet end; 13. an air flow channel;

2. a fire-retardant plate; 21. a slit; 22. slit plates; 23. a partition plate; 24. a void;

3. a top plate; 31. and a fire hole.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Embodiment one:

the embodiment provides a fire grate assembly, as shown in fig. 1-6, the fire grate assembly comprises a fire grate main body 1 and a fire retardant plate 2, wherein the fire grate main body 1 is provided with an inlet end 11 and an outlet end 12, and the inlet end 11 and the outlet end 12 are communicated through an air flow channel 13; the fire-retardant plate 2 is fixed at the outlet end 12 of the fire-bar main body 1, the fire-retardant plate 2 is provided with a plurality of slits 21, the slits 21 are sequentially arranged along the length direction of the fire-retardant plate 2, the width W1 of each slit 21 is smaller than the minimum quenching diameter of the flame formed by firing the tempering limit gas at the gas feeding temperature, and the height H of each slit 21 along the gas flow direction is larger than the quenching distance of the flame formed by firing the tempering limit gas at the gas feeding temperature.

According to the theory of combustion, when a flame propagates in a tiny channel or gap, if the gap spacing or channel diameter is small enough, the flame will extinguish after a distance of propagation, a phenomenon known as quenching. The quench diameter is the maximum passage diameter that can quench the flame, and the gas achieves the minimum quench diameter near the equivalence ratio. When the gap width remains the same and the length just extinguishes the flame, the length is referred to as the quenching distance. The quenching diameter and quenching distance are related to the combustible gas composition, temperature, pressure, flame propagation speed, etc. The fire grate assembly is suitable for the combustion condition of high-combustion-rate gas, such as hydrogen-rich natural gas or pure hydrogen natural gas, and the conventional fire grate assembly in the prior art is easy to have tempering due to the characteristics of small density and high combustion speed. In this embodiment, when the slit 21 is used for the flame retardant panel 2 by using the theory of combustion, the slit 21 extends from one end to the other end in the width direction of the flame retardant panel 2 (i.e., the direction in which the narrow face of the outlet end 12 is located), and the plurality of slits 21 are arranged in parallel with each other at intervals along the longitudinal direction of the flame retardant panel 2 (i.e., the direction in which the long side of the outlet end 12 is located). The width W1 of the slit 21 is set smaller than the minimum quenching diameter of the flame formed by the ignition of the gas component (flashback margin gas) having the largest combustion speed at the gas supply temperature, and the height H of the slit 21 in the gas flow direction is set larger than the quenching distance of the flame formed by the ignition of the gas component (flashback margin gas) having the largest combustion speed at the gas supply temperature. Under the setting parameters of the slits 21, since the width and the height of the slits 21 of the fire-retardant plate 2 are set reasonably, when flame enters the fire-retardant plate 2 due to the change of the gas composition and the operation condition, the flame firstly enters the fire-retardant plate 2, the flame is divided into small flames in a plurality of slits 21 in the fire-retardant plate 2, the flame temperature is reduced due to heat conduction, active free radicals which maintain combustion are annihilated in the collision with the solid wall surface between the slits 21, and the flame is extinguished due to the incapability of maintaining, so that the occurrence of tempering is avoided. Therefore, the fire grate assembly reduces the occurrence of tempering, and further avoids equipment damage or personal injury caused by tempering. Even if the flame fails to extinguish in the flame retardant panel 2 under extremely special circumstances, the combustion intensity thereof is greatly reduced, and also the equipment damage or personal injury accident is reduced.

In one embodiment, the fire grate assembly further comprises a top plate 3, the top plate 3 is provided with a plurality of fire holes 31, the fire holes 31 are round, the fire retardant plate 2 is clamped between the top plate 3 and the fire grate main body 1 to be fixed, the plurality of fire holes 31 are arranged in a plurality of rows along the length direction of the top plate 3, and the plurality of rows of fire holes 31 are respectively arranged right above the slits 21 along the width direction of the top plate 3.

It should be noted that, in this embodiment, as shown in fig. 2, the top plate 3 is provided with fire holes 31, and the density and size of the fire holes 31 are mainly related to the fuel gas components, and the setting principle is that the top plate 3 works at a lower temperature, and the shape and height of the flame can be integrally matched with the fuel gas water heating device, and meanwhile, the fuel gas water heating device has lower pollutant and noise emission. In the embodiment shown in fig. 2, the fire holes 31 are circular holes, and a plurality of fire holes 31 are arranged at intervals along the length direction of the slit 21 to form a plurality of rows, each row of fire holes 31 is arranged right above the slit 21, and the top plate 3 or the fire-retardant plate 2 is to ensure close fitting between the lower surface of the top plate 3 and the upper surface of the fire-retardant plate 2 during installation, so as to have better flame burning effect. Wherein the aperture of the fire hole 31 is not directly related to the size of the slit 21, as an additional effect, adding the fire-retardant plate 2 will make the air and fuel mix more fully, the discharge speed of the fire hole 31 is more uniform, and the flame height is more uniform.

In this embodiment, the tempering problem can be solved only by providing the slit 21, so the applicability of the fire-retardant plate 2 is wider.

In one embodiment, the width W1 of the slits 21 is 0.2mm-0.6mm, and/or the minimum distance between two adjacent slits 21 is 0.1mm-1mm, and/or the height H of the slits 21 in the air flow direction is not less than 10mm.

As shown in fig. 1 and 3, the slits 21 are uniformly spaced along the length direction of the firestop plate 2, and the length of the slits 21 is close to the width of the outlet end 12 along the width direction of the firestop plate 2, so that gas enters the slits 21 and the fire holes 31 through the outlet end 12. As shown in fig. 1, the top plate 31 is a shell structure with a fire hole 31 on the top surface and an opening on the bottom surface, and the fire-retardant plate 2 is covered by the top plate 31 and then is fixedly installed on the fire-retardant bar body 1, in the practical structure, as shown in fig. 3, considering the installation requirement and the structural design requirement, the lengths of the slits 21 at two ends of the fire-retardant plate 2 along the length direction are gradually reduced, the lengths of the slits 21 are not greater than the width of the fire-retardant plate 2, and the arrangement of the interval between any two adjacent slits 21 is facilitated. As shown in fig. 4 to 6, when high combustion rate gas such as hydrogen-rich gas or pure hydrogen gas is burned, the hydrogen density is small, the burning speed is high, and the conduction of flame temperature is reduced by setting the width W1 and the height H of the slit 21 and the minimum distance between the slits 21, so that the flame is extinguished at the fire-retardant plate 2 to prevent the occurrence of backfire. In addition, as an additional effect, the fire retardant plate 2 is added between the top plate 3 and the fire grate body 1, so that the air and the fuel are mixed more fully, other discharge speeds are more uniform, the flame heights are more consistent, and the combustion effect is good. Alternatively, the height H of the slits 21 in the direction of the air flow is between 10mm and 22mm, and the minimum distance between two adjacent slits 21 is between 0.1mm and 0.3mm.

In one embodiment, the firestop plate 2 includes a plurality of slit plates 22, the plurality of slit plates 22 being disposed parallel to each other and at uniform intervals, and a gap between adjacent two slit plates 22 forming a slit 21.

In this embodiment, two adjacent slits 21 are separated by a slit plate 22, which is beneficial to the reduction of temperature diffusion. The slit plate 22 is made of metal or nonmetal plate, and the metal material can be stainless steel or copper, and the nonmetal material can be silicon carbide or aluminum silicate, or other suitable materials. As shown in fig. 3 and 6, the slit plates 22 are vertically arranged and parallel to each other, and a slit 21 is formed between two adjacent slit plates 22, wherein the plate thickness d1 of the slit plates 22 is the minimum pitch of the slit 21, and the plate thickness d1 of the slit plates 22 is 0.1mm to 0.3mm. It can be seen that the slit 21 is constructed by the slit plate 22, which is beneficial to setting the dimension parameters of the slit 21, and ensures the uniformity of the dimension parameters of the slit 21. It will be appreciated that the plurality of slit plates 22 are arranged at intervals and uniformly along the length direction of the fire grate body 1 and finally fixed to the fire grate body 1 through the top plate 3, forming the fire retardant plate 2. In the preferred scheme, a plurality of slit plates 22 can be connected through connecting pieces and then installed and fixed on the fire grate body 1, so that the installation difficulty is reduced, and the installation efficiency is improved.

Embodiment two:

on the basis of the first embodiment, a fire grate assembly provided in this embodiment further includes a partition plate 23 provided in the slit 21, the partition plate 23 partitioning the slit 21 into a plurality of apertures 24 in the width direction of the slit plate 22.

In this embodiment, the two ends of the partition plate 23 are respectively abutted against the two adjacent slit plates 22 along the length direction of the fire-retardant plate 2, so that the strength of the slit plates 22 can be enhanced. And the partition plate 23 increases the area of the solid wall surface, so that the tempering effect of the wall surface is better.

In one embodiment, the partition plate 23 has a triangular corrugated shape, and the partition plate 23 and the slit plate 22 are enclosed to form a plurality of hollow triangular prism structures along the width direction of the fire retardant plate 2.

As shown in fig. 7 to 9, in the present embodiment, the partition plate 23 is distributed in the slit 21, dividing the slit 21 into a plurality of triangular apertures 24 along the length direction of the slit 21, and the air flow passes through the apertures 24 up to the fire holes 31. It will be appreciated that the partition plate 23 can support the slit plate 22 to increase the strength of the slit plate 22 and structural stability is improved.

In one of the embodiments, the plate thickness d2 of the partition plate 23 is 0.1mm to 1mm, and/or the height of the partition plate 23 in the air flow direction is not less than 10mm.

As shown in fig. 9, the plate thickness d2 of the partition plate 23 is also the minimum distance between the adjacent two voids 24, and the plate thickness d2 of the partition plate 23 is preferably 0.1mm to 0.3mm. The height of the partition plate 23 in the direction of the gas flow is preferably 10mm to 22mm, and the above-mentioned parameters are set so that the gas can pass through the holes 24 and burn in the fire holes 31, and the resistance to the gas flow is minimized while the occurrence of backfire can be avoided. In a further preferred embodiment, the thickness and the height of the partition plate 23 are equal to those of the slit plate 22, respectively, which facilitates the integral formation of the partition plate 23 and the slit plate 22, and facilitates the control of the uniformity of the dimensions of the slit 21 or the aperture 24, which facilitates the uniform combustion of the gas. In the preferred embodiment, the shapes and sizes of the plurality of gaps 24 formed between the partition plate 23 and the two slit plates 22 on both sides are the same, and the plurality of gaps 24 are alternately arranged in the length direction of the slit 21, so that the occurrence of backfire phenomenon during combustion of the gas with small density and high combustion rate is avoided.

In one embodiment, the minimum side length L2 of the triangular prism structure is 0.2mm-0.6mm.

As shown in fig. 9, a hollow triangular prism with an equilateral triangle shape in cross section is formed between the partition plate 23 and the slit plates 22, and alternate triangular holes 24 are formed between the left and right sides of the partition plate 23 and the two slit plates 22 on both sides, that is, both ends of the partition plate 23 are respectively stopped against the two slit plates 22, or the partition plate 23 is integrally formed with one slit plate 22, and the top end of the partition plate 23 is stopped against the other slit plate 22, so that in the structure, the length L2 of the minimum side length of the partition plate 23 is between 0.2 and 0.6mm, which is suitable for the combustion of gas (such as hydrogen) with high combustion rate. It will be appreciated that, when the partition plate 23 is disposed between the slit plates 22, the interval between the two slit plates 22 is slightly smaller than the interval when only the slit 21 is provided (i.e., the width W1 of the slit 21) according to the length L2 of the minimum side length of the partition plate 23, so as to prevent the occurrence of flashback. Compared with the fire grate design of the porous medium, the fire retardant plate 2 with the slits 21 or the holes 24 of the embodiment has simple structure, small flow resistance and easy cleaning and replacement.

The application also provides a burner comprising the fire grate assembly provided in the first embodiment or the second embodiment.

By adopting the fire grate assembly provided by the first embodiment and the second embodiment, the slit 21 or the hole 24 is arranged on the fire retardant plate 2, so that the tempering problem of the fire grate assembly is effectively solved, and further the damage to burner equipment or personal injury caused by tempering is avoided. The burner is particularly suitable for burning gas with small density and high burning rate, and can effectively prevent backfire.

The application also provides gas water heating equipment, which comprises the burner.

The gas water heating equipment adopts the burner provided by the utility model, the burner comprises the fire grate component provided by the first embodiment or the second embodiment, the fire grate component comprises the fire-retarding plate 2, the slit 21 is arranged on the fire-retarding plate 2, and the fire grate component can be suitable for burning gas with small density and high burning speed on the basis of preventing backfire through the size design of the slit 21. The gas water heating equipment of the embodiment effectively solves the tempering problem, and further avoids the damage or personal injury of the gas water heating equipment caused by tempering. The gas water heating equipment can be gas water heater or wall-hanging stove or boiler.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing detailed description of the embodiments presents only a few embodiments of the present utility model, which are described in some detail and are not intended to limit the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. Fire row subassembly, its characterized in that includes:

a fire grate body (1), wherein the fire grate body (1) is provided with an inlet end (11) and an outlet end (12), and the inlet end (11) and the outlet end (12) are communicated through an airflow channel (13);

the fire-retardant plate (2) is arranged at the outlet end (12) of the fire-retardant main body (1), the fire-retardant plate (2) is provided with a plurality of slits (21), the slits (21) are sequentially arranged along the length direction of the fire-retardant plate (2), the width W1 of each slit (21) is smaller than the minimum quenching diameter of a flame formed by firing of tempering limit gas at the gas feeding temperature, and the height H of each slit (21) along the gas flow direction is larger than the quenching distance of the flame formed by firing of the tempering limit gas at the gas feeding temperature.

2. A fire grate assembly as claimed in claim 1, characterized in that the width W1 of the slit (21) is 0.2-0.6 mm;

and/or, the minimum distance between two adjacent slits (21) is 0.1mm-1mm;

and/or the height H of the slit (21) along the air flow direction is not less than 10mm.

3. Fire grate assembly according to claim 1, characterized in that the fire retardant plate (2) comprises a plurality of slit plates (22), a plurality of slit plates (22) being arranged parallel to each other and evenly spaced apart, a gap between two adjacent slit plates (22) forming the slit (21).

4. A fire grate assembly as claimed in claim 3, characterized in that the fire retardant plate (2) further comprises a partition plate (23) provided in the slit (21), the partition plate (23) dividing the slit (21) into a plurality of apertures (24) in the width direction of the slit plate (22).

5. Fire grate assembly according to claim 4, characterized in that the partition plates (23) are arranged in a corrugated shape, and the partition plates (23) and the slit plates (22) are enclosed to form a plurality of hollow triangular prism structures along the width direction of the fire retardant plate (2).

6. Fire grate assembly according to claim 5, characterized in that the plate thickness d2 of the dividing plate (23) is 0.1mm-1mm; and/or the height of the partition plate (23) in the air flow direction is not less than 10mm.

7. A fire grate assembly as claimed in claim 5 wherein the length L2 of the smallest side of the triangular prism structure is 0.2-0.6mm.

8. The fire grate assembly according to any one of claims 1 to 7, further comprising a top plate (3), wherein the fire-retardant plate (2) is sandwiched between the top plate (3) and the fire grate main body (1) to be fixed, the top plate (3) has a plurality of fire holes (31), a plurality of the fire holes (31) are arranged in a plurality of rows along a length direction of the top plate (3), and a plurality of the fire holes (31) are respectively arranged right above the slits (21) along a width direction of the top plate (3).

9. A burner comprising a fire grate assembly as claimed in any one of claims 1 to 8.

10. Gas water heating plant, characterized in that it comprises a burner according to claim 9.

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