CN117490070A - Fire grate for burner, burner and water heater - Google Patents

Abstract

The invention provides a fire grate for a burner, the burner and a water heater, wherein the fire grate comprises an injection channel, a bending channel and a diversion chamber. The injection passage has a fire grate inlet formed in a first side of the fire grate for being disposed opposite the gas supply port. The injection channel extends along the introduction direction of the gas introduction fire exhaust inlet. The first end of the curved passage communicates with the downstream end of the injection passage, and the second end of the curved passage curves toward the first side of the fire row. The flow dividing chamber is communicated with the bending channel, and the upper side of the flow dividing chamber extends towards flame holes of the fire row. The diversion chamber comprises a pressing part, the pressing part is arranged close to the bending channel, and the pressing part is used for enabling the interval of the diversion chamber at the pressing part to be smaller. The pressure part is used for reducing the interval between the flow dividing chamber and the pressure part so as to adjust the air flow speed of the flame holes at the pressure part.

Description

Fire grate for burner, burner and water heater

Technical Field

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

Background

At present, the household gas water heater is mainly divided into a lower drum type water heater and an upper pumping type water heater. The fan of the lower drum type water heater is arranged below the water heater, and the fan of the upper pumping type water heater is arranged above the water heater. In general, the water heater introduces fuel gas into the fire grate through an injection channel, a bending channel, a diversion channel and the like. At present, the requirements of different flame holes of a fire row on the air flow speed are different, and how to adjust the air flow speed at the flame holes at a specific position of the fire row is called as a problem to be solved urgently.

Disclosure of Invention

An object of the present invention is to provide a fire grate for a burner, a burner and a water heater for solving the above technical problems.

In particular, the present invention provides a fire grate for a burner comprising:

an injection passage having a fire row inlet formed at a first side of the fire row and arranged to be opposed to the gas supply port, the injection passage extending in an introduction direction of the gas into the fire row inlet;

a curved passage having a first end communicating with the downstream end of the injection passage and a second end curved toward the first side of the fire row;

a flow dividing chamber communicating with the curved passage, the upper side of which extends toward flame holes of the fire row, comprising:

and a pressing portion disposed adjacent to the curved passage for making a space between the flow dividing chambers at the pressing portion smaller.

Optionally, the curved channel has an elongated communication portion, the flow dividing chamber is communicated with the curved channel through the communication portion, two side walls of the flow dividing chamber are disposed at two sides of the communication portion along a width direction thereof, and the two side walls of the flow dividing chamber are recessed inward to form the pressing portion.

Optionally, the depth of the inward depression of the pressing portion ranges from 5% to 15% of the distance between the two side walls of the flow dividing chamber.

Alternatively, the pressure portion extends from the communication portion toward the flame holes of the flame row.

Alternatively, the pressing portion and the communicating portion are each arc-shaped in shape, the communicating portion is provided along an outer peripheral wall of the curved passage, and the pressing portion is provided along a length direction of the communicating portion.

Alternatively, the length value of the pressing portion in the extending direction thereof accounts for 30% to 70% of the length value of the pressing portion in the communicating portion length direction.

Optionally, the first end of the communicating portion along its length is adjacent to the first side of the curved channel, and the first end of the communicating portion is downstream of the apex of the curved channel.

Optionally, the lower side wall of the diversion chamber extends from the first end of the communication portion towards a second side of the fire row opposite the first side of the fire row;

the included angle between the lower side wall of the diversion chamber and the second side of the fire row is larger than the included angle between the connecting line of the lower side of the first end of the bending channel and the tail end of the extending end of the lower side wall of the diversion chamber and the second side of the fire row.

According to a second aspect of the present invention there is also provided a burner comprising a fire grate for a burner as claimed in any one of the above.

According to a third aspect of the present invention there is also provided a water heater comprising a burner as above.

The invention provides a fire grate for a burner, the burner and a water heater, wherein the fire grate comprises an injection channel, a bending channel and a diversion chamber. The injection passage has a fire grate inlet formed in a first side of the fire grate for being disposed opposite the gas supply port. The injection channel extends along the introduction direction of the gas introduction fire exhaust inlet. The first end of the curved passage communicates with the downstream end of the injection passage, and the second end of the curved passage curves toward the first side of the fire row. The flow dividing chamber is communicated with the bending channel, and the upper side of the flow dividing chamber extends towards flame holes of the fire row. The diversion chamber comprises a pressing part, the pressing part is arranged close to the bending channel, and the pressing part is used for enabling the interval of the diversion chamber at the pressing part to be reduced so as to adjust the air flow speed of flame holes at the position, so that the air flow speed of different flame holes of the fire row can be met.

The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic view of a fire grate in accordance with an embodiment of the invention;

FIG. 2 is a schematic view of a fire row from another perspective in accordance with one embodiment of the invention;

FIG. 3 is an exploded view of a fire grate according to one embodiment of the invention;

FIG. 4 is a cross-sectional view of a fire grate in accordance with one embodiment of the present invention;

FIG. 5 is a cross-sectional view of a fire row from another perspective in accordance with one embodiment of the present invention;

FIG. 6 is another cross-sectional view of a fire grate in accordance with an embodiment of the present invention;

FIG. 7 is an enlarged schematic view of FIG. 6 at C;

FIG. 8 is a schematic view of a water heater according to one embodiment of the present invention;

FIG. 9 is a simulated view of a fire row without a pressure section according to one embodiment of the invention;

FIG. 10 is a simulated view of a fire grate with a nip according to one embodiment of the present invention;

FIG. 11 is a velocity diagram of flame holes of a firerow with a plenum according to one embodiment of the invention;

FIG. 12 is a flow field simulation of a combustion section of a prior art fire grate in accordance with the present invention;

fig. 13 is a flow field simulation of the combustion section of a fire row according to one embodiment of the invention.

Detailed Description

FIG. 1 is a schematic view of a fire grate in accordance with an embodiment of the invention; FIG. 2 is a schematic view of a fire row from another perspective in accordance with one embodiment of the invention; FIG. 3 is an exploded view of a fire grate according to one embodiment of the invention; FIG. 4 is a cross-sectional view of a fire grate in accordance with one embodiment of the present invention; FIG. 5 is a cross-sectional view of a fire row from another perspective in accordance with one embodiment of the present invention; FIG. 6 is another cross-sectional view of a fire grate in accordance with an embodiment of the present invention; FIG. 7 is an enlarged schematic view of FIG. 6 at C; FIG. 8 is a schematic view of a water heater according to one embodiment of the present invention; FIG. 9 is a simulated view of a fire row without a pressure section according to one embodiment of the invention; FIG. 10 is a simulated view of a fire grate with a nip according to one embodiment of the present invention; FIG. 11 is a velocity diagram of flame holes of a firerow with a plenum according to one embodiment of the invention; FIG. 12 is a flow field simulation of a combustion section of a prior art fire grate in accordance with the present invention; fig. 13 is a flow field simulation of the combustion section of a fire row according to one embodiment of the invention.

The present embodiment provides a fire grate 10 for a burner 20, as shown in fig. 1, the fire grate 10 includes a fire grate body 30 and a fire cap 40, wherein the fire cap 40 is covered over the fire grate body 30, and an auxiliary channel is formed between the fire grate body 30 and the fire grate body. The fire grate body 30 includes a diverting portion 100 and a combustion portion 200, the diverting portion 100 for delivering fuel gas and air to the combustion portion 200. The diverter portion 100 includes an injection passage 110, a tortuous passage 120, a diverter passage 130, and a diverter chamber 140. The combustion section 200 includes a first gradually widening channel 210, a connecting channel 220, a second gradually widening channel 230, a combustion channel 240, and a main flame hole section 250.

In the present embodiment, the type of the water heater 1 is not limited. As a specific example, as shown in fig. 8, the water heater 1 is a down drum type water heater, that is, a fan is located below the water heater 1. It will be apparent that this is by way of example only and not by way of example only. For example, the water heater 1 may be an up-draw water heater, i.e. the fan is located above the water heater 1. As shown in fig. 8, the water heater 1 includes a plurality of fire rows 10, and the plurality of fire rows 10 are arranged in parallel inside the water heater 1.

In the present embodiment, the formation modes of the flow dividing portion 100 and the combustion portion 200 are not limited, and may be selected as needed. For example, the shunt portion 100 and the combustion portion 200 may be cast molding of the fire grate body 30. As a specific example, as shown in fig. 2 to 5, the fire grate body 30 is formed by buckling two fire grate pieces having a specific shape, and the two fire grate pieces having a specific shape are buckled so that the fire grate 10 forms the branching portion 100, the combustion portion 200, and the like. The specific shape of the fire grate sheet can be formed by later punching and die cutting, or cast molding.

The characteristic shape of the fire grate is not particularly limited, and the fire grate can form the injection channel 110, the bending channel 120, the diversion channel 130, the combustion channel 240 and the like after being buckled. The specific shape of the fire grate segments is related to the shapes of the injection channel 110, the bent channel 120, the shunt channel 130 and the combustion channel 240, and the fire grate segments of the specific shape are punched or cast according to the specific shapes of the injection channel 110, the bent channel 120, the shunt channel 130 and the combustion channel 240, etc.

The injection passage 110 has a flame discharge inlet 114 formed on a first side of the flame row 10 and disposed opposite to the gas supply port, and extends in the direction of introduction of the gas into the flame discharge inlet 114. The first end of the curved passage 120 communicates with the downstream end of the injection passage 110, and the second end of the curved passage 120 curves toward the first side of the fire row 10. The flow dividing chamber 140 communicates with the curved passage 120, and an upper side thereof extends toward flame holes of the flame bank 10, and the flow dividing chamber 140 includes a pressing portion 141. The pressing portion 141 is disposed near the curved passage 120 for making the interval of the flow dividing chamber 140 at the pressing portion 141 smaller.

As shown in fig. 8, the fan and the gas pipe are juxtaposed under the water heater 1, that is, the fan is located at the lower left side of the water heater 1, and the gas pipe is located at the lower right side of the water heater 1. The gas pipe has a gas supply port through which gas is supplied into the fire grate 10.

In this embodiment, the first side of the fire row 10 refers to the side of the fire row 10 that is used to form the fire row inlet 114. As a specific example, a first side of the fire row 10 refers to the front side of the fire row 10 and a second side of the fire row 10 refers to the rear side of the fire row 10.

The fire discharge inlet 114 is disposed opposite the gas supply inlet, i.e., the fire discharge inlet 114 faces the gas supply inlet. As a specific example, as shown in fig. 8, the gas supply port is located at the front side of the fire grate 10, the gas supply port is directed to the rear side of the water heater 1, and the fire grate inlet 114 is directed to the front side of the water heater 1. The fire discharge inlet 114 is disposed opposite to the gas supply inlet, and the gas discharged from the gas pipe passes through the fire discharge inlet 114 and enters the fire row 10. The shape of the fire grate inlets 114 is not limited and may be selected as desired. As a specific example, as shown in fig. 1 to 3, the fire grate inlet 114 is in the shape of an oblong circle.

The direction of introduction of the fuel gas into the fire grate inlet 114, i.e., the direction from the first side of the fire grate 10 to the second side of the fire grate 10, i.e., the length direction of the fire grate 10.

The injection channel 110 extends in the introduction direction of the fuel gas into the flame-discharge inlet 114, i.e., the injection channel 110 extends from the front side to the rear side of the flame row 10, i.e., the injection channel 110 extends in the longitudinal direction of the flame row 10, i.e., the fuel gas flows from the flame-discharge inlet 114 to the end of the injection channel 110 in the extending direction thereof. Thus, the end of the injection passage 110 in the extending direction thereof is the downstream end of the injection passage 110, that is, the end of the injection passage 110 opposite to the fire discharge inlet 114 is the downstream end of the injection passage 110.

The first end of the curved passage 120 and the second end of the curved passage 120 are both ends of the curved passage 120 in the extending direction thereof, that is, both ends of the curved passage 120 in the flowing direction thereof. The first end of the tortuous path 120 communicates with the downstream end of the injection path 110, i.e., the mixture flows into the tortuous path 120 from the first end of the tortuous path 120.

In the present embodiment, the formation manner, shape, and the like of the pressing portion 141 are not particularly limited. The pressing portion 141 may reduce the interval between the flow dividing chamber 140 and the pressing portion 141, that is, the pressing portion 141 may reduce the interval between the first fire row sheet and the second fire row sheet at the pressing portion 141. As a specific embodiment, as shown in fig. 6 and 7, the pressing portion 141 is formed by inwardly recessing two side walls of the distribution chamber 140, that is, the pressing portion 141 is formed by inwardly recessing the first fire grate segment and the second fire grate segment at the distribution chamber 140.

In the present embodiment, the shape and type of the flame holes provided in the flame bank 10 are not limited, and may be selected as needed. As a specific example, as shown in fig. 2 to 6, the fire row 10 has a plurality of groups of flame holes, which are spaced from the rear side of the fire row 10 to the front side of the fire row 10. The plurality of groups of flame holes are sequentially referred to as a first group of flame holes, a second group of flame holes, a third group of flame holes, a fourth group of flame holes, etc., from the rear side of the flame row 10 to the front side of the flame row 10. The number of flame holes included in each group of flame holes is not limited and may be selected as needed. As a specific example, as shown in fig. 2, the first group of flame holes and the group of flame holes near the front side of the flame row 10 include three flame holes, and each group of flame holes in the middle thereof includes four flame holes. As a specific example, as shown in fig. 4 and 5, the flame holes include a main flame hole 251 and auxiliary flame holes located at the top of the auxiliary passage, the auxiliary flame holes being located at the left and right sides of the main flame hole 251.

The flow dividing chamber 140 includes a pressing portion 141, the pressing portion 141 is disposed near the curved passage 120, and the interval of the flow dividing chamber 140 at the pressing portion 141 becomes smaller. As shown in fig. 9 and 10, the pressing portion 141 makes the size of the second vortex E formed in the flow distributing chamber 140 in the longitudinal direction of the fire row 10 smaller. As shown in fig. 11, the pressure portion 141 also makes the air flow velocity at the third group flame holes and the fourth group flame holes on the rear side of the flame row 10 higher. This ensures the heights of the third and fourth sets of flame holes while reducing the heights of the flames at the first and second sets of flame holes. When the whole water heater works, the temperature of the back plate of the water heater 1 can be reduced, damage is reduced, and the heights of the third group of flame holes and the fourth group of flame holes are adjusted at the same time so as to meet the requirements of different flame holes of the fire row 10 on the air flow speed.

In other embodiments, the curved channel 120 has an elongated communication portion, the flow dividing chamber 140 is communicated with the curved channel 120 through the communication portion, two side walls of the flow dividing chamber 140 are disposed at two sides of the communication portion along the width direction thereof, and two side walls of the flow dividing chamber 140 are recessed inward to form the pressing portion 141.

In this embodiment, the specific structure of the communicating portion is not limited, and as a specific embodiment, the communicating portion is a first long slit section with a long shape on the curved channel 120. The two sidewalls of the flow splitting chamber 140 are disposed at both sides of the communicating portion along the width direction thereof, that is, the two sidewalls of the flow splitting chamber 140 are disposed at both sides of the first long slit section along the width direction thereof.

Both side walls of the flow dividing chamber 140 are recessed inward to form a pressing portion 141. In this embodiment, the two side walls of the flow dividing chamber 140 are two side walls located along the width direction of the first long slit section. As shown in fig. 6 and 7, both side walls of the distribution chamber 140 refer to a left side wall of the distribution chamber 140 and a right side wall of the distribution chamber 140. The left side wall is recessed to the right side, and the right side wall is recessed to the left side to form the pressing portion 141. This way of forming the pressing portion 141 is simple.

In other embodiments, the depth of the inward depression of the pressing portion 141 ranges from 5% to 15% of the distance between the two side walls of the flow dividing chamber 140. When the whole water heater works, the temperature of the back plate of the water heater 1 can be reduced, damage is reduced, and meanwhile, the uniformity of the whole flame holes of the fire row 10 is ensured.

In other embodiments, the pressure portion 141 extends from the communication portion toward the flame holes of the flame bank 10. When the whole water heater works, the temperature of the back plate of the water heater 1 can be reduced, damage is reduced, and meanwhile, the uniformity of the whole flame holes of the fire row 10 is ensured.

In other embodiments, as shown in fig. 1 and 3, the pressing portion 141 and the communicating portion are both arc-shaped, the communicating portion is disposed along the outer peripheral wall of the curved channel 120, and the pressing portion 141 is disposed along the length direction of the first long slit section. The shape of the pressing portion 141 is circular arc-shaped, which makes the air flow distribution relatively uniform, and makes the combustion stability of the fire grate 10 relatively good.

In other embodiments, the length of the nip 141 along its extension ranges from 30% to 70% of the length of the nip 141 along the length of the first length slit section. This results in a relatively uniform airflow distribution and better combustion stability of the fire grate 10.

In other embodiments, the first end of the communication along its length is proximate to a first side of the tortuous path 120, the first end of the communication being downstream of the apex 121 of the tortuous path. That is, a first end of the first long slit section along its length is adjacent to a first side of the curved channel 120, the first end of the first long slit section being downstream of the apex 121 of the curved channel. That is, as shown in fig. 1 and 3, the first end of the first long slit section is located above the apex 121 of the curved channel.

This can solve the technical problem of less air flow diversion on the first side of the fire grate 10 and uneven air flow on the first side of the fire grate 10 and the second side of the fire grate 10. This results in a more uniform air flow from each flame hole at the top of the flame row 10 and good combustion stability. This results in the formation of a first vortex D at the curved passage 120, which results in higher uniformity of mixing of the fuel gas and air, ensures uniformity and combustion stability of each flame hole, and improves the technical problem of high fuel gas concentration of the rear side flame holes of the conventional flame row 10.

In other embodiments, the lower side wall 142 of the flow-splitting chamber 140 extends from the first end of the communication portion toward a second side of the fire row 10, the second side of the fire row 10 being opposite the first side of the fire row 10. The angle between the lower side wall 142 of the flow diversion chamber 140 and the second side of the fire row 10 is larger than the angle between the line of the lower side of the first end of the curved passage 120 and the end of the extended end of the lower side wall 142 of the flow diversion chamber 140 and the second side of the fire row 10.

The angle of the lower side wall 142 of the distribution chamber 140 to the second side of the fire row 10, i.e. the angle α of the lower side wall 142 of the distribution chamber 140 to the line segment B of the second side of the fire row 10. The line of the lower side of the first end of the curved passage 120 with the end of the extending end of the lower side wall 142 of the flow dividing chamber 140, that is, the line segment a, and the line of the lower side of the first end of the curved passage 120 with the end of the extending end of the lower side wall 142 of the flow dividing chamber 140 form an angle with the second side of the fire row 10, that is, the line segment a and the line segment B form an angle β.

This causes a first vortex D to form at the curved passage 120, which improves the uniformity of mixing of air and gas within the curved passage 120, thereby ensuring uniformity of combustion speed and height between groups of flame holes. This also causes a second vortex E to form in the dispersion chamber 140 which serves to inhibit excessive air flow at the first and second sets of flame holes on the rear side of the flame bank 10, reducing the flame speed of the first and second sets of flame holes. When the whole water heater works, the surface temperature of the back plate of the water heater 1 can be reduced, and damage is reduced.

In other embodiments, the apex 121 of the curved channel is spaced from a second side of the fire row 10, the second side of the fire row 10 being opposite the first side of the fire row 10, the spacing being greater than 10% of the overall distance of the fire row 10 in the direction of introduction.

The distance of the interval in the introduction direction is more than 10% of the entire distance of the fire row 10 in the introduction direction, that is, the distance of the interval in the introduction direction is more than 10% of the length of the fire row 10.

The apex 121 of the curved channel is spaced from the second side of the fire row 10 by a distance in the direction of introduction that is greater than 10% of the distance of the fire row 10 along its length. This can solve the technical problem of less air flow diversion on the first side of the fire grate 10 and uneven air flow on the first side of the fire grate 10 and the second side of the fire grate 10. This results in a more uniform air flow from each flame hole at the top of the flame row 10 and good combustion stability.

In other embodiments, the distance separating the fire row 10 in the direction of introduction is in the range of 20% to 50% of the overall distance of the fire row in the direction of introduction. That is, the distance of the interval in the introduction direction is in the range of 20% to 50% of the length of the fire row 10. This can solve the technical problem of less air flow diversion on the first side of the fire grate 10 and uneven air flow on the first side of the fire grate 10 and the second side of the fire grate 10. This results in a more uniform air flow from each flame hole at the top of the flame row 10 and good combustion stability.

In other embodiments, the distance separating the fire row 10 in the direction of introduction is a proportion of 30% of the overall distance of the fire row in the direction of introduction. That is, the distance between the gaps in the direction of introduction is 30% of the length of the fire row 10. This can solve the technical problem of less air flow diversion on the first side of the fire grate 10 and uneven air flow on the first side of the fire grate 10 and the second side of the fire grate 10. This results in a more uniform air flow from each flame hole at the top of the flame row 10 and good combustion stability.

In other embodiments, the fire grate 10 for the burner 20 further includes a shunt channel 130, a first end of the shunt channel 130 communicating with a second end of the curved channel 120, the second end of the shunt channel 130 extending toward the first side of the fire grate 10. The curved channel 120 and the shunt channel 130 have a long slit extending from the curved channel 120 towards the second end of the shunt channel 130; the long slits serve to communicate the curved passage 120 and the shunt passage 130 with the flame holes of the fire row 10, the width of which increases in the extending direction thereof.

The first end and the second end of the split flow channel 130 are two ends of the split flow channel 130 along the flow direction thereof, and in this embodiment, the mixture flows from the first end of the split flow channel 130 to the second end of the split flow channel 130.

The long slits serve to communicate the curved passage 120 and the shunt passage 130 with the flame holes of the fire row 10, the width of which increases in the extending direction thereof. That is, the mixture gas in the curved passage 120 and the branch passage 130 flows out through the long slit to the flame holes of the flame row 10. The width of the long slit increases along its extension, i.e. the width of the long slit increases continuously during the process of the long slit from its first end to its second end. This can solve the technical problem of less air flow diversion on the first side of the fire grate 10 and uneven air flow on the first side of the fire grate 10 and the second side of the fire grate 10. This results in a more uniform air flow from each flame hole at the top of the flame row 10 and good combustion stability.

In other embodiments, as shown in fig. 1 and 3, the beginning of the long slit is located downstream of the apex 121 of the curved channel. I.e. the beginning of the long slit is located above the apex 121 of the curved channel. In other embodiments, the width of the elongated slot increases gradually along its extension. This can solve the technical problem of less air flow diversion on the first side of the fire grate 10 and uneven air flow on the first side of the fire grate 10 and the second side of the fire grate 10. This results in a more uniform air flow from each flame hole at the top of the flame row 10 and good combustion stability. The air flow of each fire hole is stable, and the combustion effect is good.

In other embodiments, the long slit comprises a first long slit section located on the curved channel 120, i.e. the long slit is divided into a first long slit section and a second long slit section 131 along its extension. Wherein the first long slit section is located on the curved channel 120 and the second long slit section 131 is located on the shunt channel 130. The flow splitting chamber 140 communicates with the tortuous path 120 through a first long slit section.

In other embodiments, the injection channel 110 includes a converging channel section 111 and a mixing channel section 112, the converging channel section 111 having a fire discharge inlet 114 for placement opposite the gas supply port, the converging channel section 111 extending in the direction of introduction of the gas into the fire discharge inlet 114. The upstream end of the mixing channel segment 112 is connected to the downstream end of the converging channel segment 111, and the fire row 10 forms a smooth arc-shaped inner wall at the junction of the converging channel segment 111 and the mixing channel segment 112.

Wherein the convergent channel segment 111 extends in the direction of introduction of the gas into the fire exhaust inlet 114. That is, the constricted passage section 111 extends from the front side to the rear side of the fire row 10. That is, the constricted passage segment 111 extends along the length of the fire row 10. I.e. the fuel gas flows from the flame exit inlet 114 to the end of the convergent channel segment 111 in its extension. Thus, the end of the constricted passage section 111 in the extending direction thereof is the downstream end of the constricted passage section 111, that is, the end of the constricted passage section 111 opposite to the fire row inlet 114 is the downstream end of the constricted passage section 111.

In the present embodiment, the formation manner of the constricted passage section 111 is not limited. As a specific example, as shown in fig. 2, two fire row tabs are snapped together to form a fire row 10, with the two fire row tabs projecting outwardly to form a constricted passage section 111.

The mixing channel segment 112 has its first and second ends along its extension, respectively. Wherein the first end of the mixing channel segment 112 is close to the front side of the water heater 1, the first end of the mixing channel segment 112 is connected to the downstream end of the constriction channel segment 111. The fuel gas flows from the first end of the mixing channel segment 112 to the second end of the mixing channel segment 112. Thus, the first end of the mixing channel segment 112 is the upstream end of the mixing channel segment 112 and the second end of the mixing channel segment 112 is the downstream end of the mixing channel segment 112.

The fire row 10 forms a smooth arc-shaped inner wall at the junction of the convergent channel segment 111 and the mixing channel segment 112, i.e. at the junction of the downstream end of the convergent channel segment 111 and the upstream end of the mixing channel segment 112. This results in less resistance to the passage of fuel gas through the convergent channel segment 111 and the mixing channel segment 112 into the fire grate 10, i.e. it results in easier flow of the mixture from the convergent channel segment 111 to the mixing channel segment 112, i.e. it results in less resistance to the flow of the mixture from the convergent channel segment 111 to the mixing channel segment 112. This also makes it easier for the gas to inject air into the constricted passage section 111, i.e. this increases the injection coefficient of the gas injection air.

In other embodiments, as shown in fig. 1 and 3, the downstream end of the converging channel section 111 is tangential to the upstream end of the mixing channel section 112 such that the fire row 10 forms a smooth arcuate inner wall at the junction of the converging channel section 111 and the mixing channel section 112. This results in less resistance to the passage of fuel gas through the convergent channel segment 111 and the mixing channel segment 112 into the fire grate 10, and also results in the fuel gas being able to easily inject air into the convergent channel segment 111.

In other embodiments, the tangent to the downstream end of the converging channel section 111 is parallel to the direction of introduction, i.e. the tangent to the downstream end of the converging channel section 111 extends in a horizontal direction and the mixing channel section 112 extends in the direction of the tangent. This results in less resistance to the passage of fuel gas through the convergent channel segment 111 and the mixing channel segment 112 into the fire grate 10, and also results in the fuel gas being able to easily inject air into the convergent channel segment 111.

In other embodiments, the fire grate 10 for the burner 20 further includes a diverging passage section 113, an upstream end of the diverging passage section 113 is connected to a downstream end of the mixing passage section 112, and the fire grate 10 forms a smooth arc-shaped inner wall at the junction of the diverging passage section 113 and the mixing passage section 112.

The expansion passage segment 113 extends in the introduction direction, and a first end and a second end of the expansion passage segment 113 in the extending direction thereof are an upstream end of the expansion passage segment 113 and a downstream end of the expansion passage segment 113, respectively. The first end of the expansion channel segment 113 communicates with the downstream end of the contraction channel segment 111, and the fuel gas is introduced into the expansion channel segment 113 from the first end of the expansion channel segment 113, and flows from the first end of the expansion channel segment 113 to the second end of the expansion channel segment 113. Thus, the first end of the expansion channel segment 113 is the upstream end of the expansion channel segment 113 and the second end of the expansion channel segment 113 is the downstream end of the expansion channel segment 113. The fire grate 10 forms a smooth arc-shaped inner wall at the junction of the expansion channel section 113 and the mixing channel section 112, which results in less resistance to the entry of fuel gas from the mixing channel section 112 into the expansion channel section 113.

In other embodiments, the convergent channel segment 111 tapers in the direction of introduction, the divergent channel segment 113 tapers in the direction of introduction, and the mixing channel segment 112 has the same cross section perpendicular to the direction of introduction in the direction of introduction.

The constriction channel section 111 is gradually constricted in the introduction direction, and the gradual constriction of the constriction channel section 111 can reduce the resistance to the flow of the fuel gas, and at the same time, cause the fuel gas and the air to be gradually mixed. The cross section of the mixing channel section 112 perpendicular to the introduction direction is identical in the introduction direction, i.e. the cross section of the mixing channel section 112 is constant along its extension. This allows the gas and air mixture to be thoroughly mixed therein. The expanding channel section 113 gradually expands in the introducing direction, and the mixture entering the expanding channel from the narrower mixing channel can further promote the mixing of the mixture.

In other embodiments, the length of the mixing channel segment 112 is 1.5 to 2.5 times the length of the contracting channel segment 111, and the length of the mixing channel segment 112 is 1.5 to 2.5 times the length of the expanding channel segment 113. This allows the mixture to be thoroughly mixed.

In other embodiments, the constricted passage segment 111 is oblong in shape in cross-section perpendicular to the introduction direction. This results in less angular edges of the constricted passage section 111 and less resistance to the mixture, while at the same time, this results in a smaller width of the constricted passage section 111, reducing the volume of the water heater 1.

In other embodiments, the mixing channel segment 112 is elliptical in shape in cross-section perpendicular to the direction of introduction. This results in fewer corners of the mixing channel segment 112 and less resistance to the mixture, while at the same time, this results in a smaller width of the mixing channel segment 112, reducing the volume of the water heater 1.

In other embodiments, the diversion portion 100 has a fire exhaust inlet 114 disposed opposite to the gas supply port, and the top of the diversion portion 100 has an elongated communication structure, the length of which is along the direction of introduction of the gas into the fire exhaust inlet 114;

the lower end of the first widening channel 210 is connected to the communication structure to communicate with the flow dividing part 100, and extends upward from the communication structure, and two side walls 211 of the first widening channel are respectively disposed at two sides of the communication structure along the width direction thereof, and an included angle of a surface of the two side walls 211 of the first widening channel is smaller than 90 °.

In the present embodiment, the specific shape and components of the shunt portion 100 are not limited, and may be selected as needed. As a specific example, as shown in fig. 1 to 6, the diverting portion 100 includes an injection passage 110, a curved passage 120, a diverting passage 130, and a diverting chamber 140.

In the present embodiment, the specific shape of the communication structure is not limited, and may be selected as needed. As a specific example, the communication structure is divided into a second long slit section 131 on the diverting passage 130 and a slit 143 on the diverting chamber 140 along its length. The communication structure comprises a second long slit section 131 on the split channel 130 and a slit 143 on the split chamber 140, wherein the second long slit section 131 on the split channel 130 and the slit 143 on the split chamber 140 are sequentially arranged from front to back.

As shown in fig. 5, the lower end of the first widening channel 210 is connected to the communication structure. The two sidewalls 211 of the first gradually widening channel are disposed at two sides of the communication structure along the width direction thereof, that is, the two sidewalls 211 of the first gradually widening channel are the left and right sidewalls of the first gradually widening channel 210.

The mixture of gas and air flows through the communication structure to the first widening passage 210 from a small size to a large size. As shown in fig. 12, if the included angle between the two side walls 211 of the first widening channel is too large, the mixture gas will generate the vortex of the mixture gas in the left and right spaces under the action of the pressure field, which will cause the mixture gas flow and flame to swing left and right.

The included angle of the surfaces of the two side walls 211 of the first gradually widening channel is smaller than 90 degrees, and the included angle of the surfaces of the two side walls 211 of the first gradually widening channel is smaller. As shown in fig. 13, this avoids the mixture gas from generating the anti-coherent vortex in the left and right spaces under the action of the pressure field, which solves the problems of side-to-side and flame-side of the mixture gas flow, and makes the combustion of the flame relatively stable.

In other embodiments, the first diverging passageway has two side walls 211 at an angle of 30 °. As shown in fig. 13, this prevents the mixture gas from generating such a vortex that counteracts each other in the left and right spaces when flowing to the first widening passage 210 through the communication structure. The problems of side-to-side and flame side-to-side of the air flow of the mixed gas are solved, and the combustion of the flame is stable.

In other embodiments, the fire grate 10 further includes a connecting channel 220, the lower end of the connecting channel 220 being in communication with the upper end of the first tapered channel 210 and extending upwardly from the upper end of the first tapered channel 210. The lower ends of the two side walls 221 of the connecting channel are respectively connected with the upper ends of the two side walls 211 of the first gradually-widening channel, and the included angle of the surfaces of the two side walls 221 of the connecting channel is 90 degrees. As shown in fig. 13, this solves the problems of the air flow of the mixture and the flame rocking side to side, so that the combustion of the flame is relatively stable, and the mixture of the fuel gas and the air is relatively uniform.

In other embodiments, the fire grate 10 further includes a second tapered passage 230, a lower end of the second tapered passage 230 communicating with an upper end of the connecting passage 220, and extending upward from the upper end of the connecting passage 220. The lower ends of the two side walls 231 of the second gradually-widening channel are respectively connected with the upper ends of the two side walls 221 of the connecting channel, and the included angle of the surfaces of the two side walls 231 of the second gradually-widening channel is smaller than 90 degrees.

The mixture flowing from the connecting passage 220 to the second widening passage 230 is flowing from a small size to a large size, as shown in fig. 12, if the included angle between the two side walls 231 of the second widening passage is too large, the mixture will generate the vortex of the mixture in the left and right spaces under the action of the pressure field, which will cause the mixture flow and flame to swing left and right.

The angle between the two side walls 231 of the second gradually widening channel is smaller than 90 degrees, and at this time, the angle between the two side walls 231 of the second gradually widening channel is smaller. As shown in fig. 13, this avoids the mixture gas from generating the anti-coherent vortex in the left and right spaces under the action of the pressure field, which solves the problems of the air flow side to side and the flame side to side of the mixture gas, so that the combustion of the flame is stable.

In other embodiments, the angle between the two sidewalls 211 of the first gradually widening channel is smaller than the angle between the two sidewalls 231 of the second gradually widening channel. The mixture flows from the first gradually widening channel 210 to the second gradually widening channel 230 from the small-sized flow channel to the large-sized flow channel, and the included angle of the surfaces of the two side walls 211 of the first gradually widening channel is smaller than the included angle of the surfaces of the two side walls 231 of the second gradually widening channel, that is, the gradual widening from the first gradually widening channel 210 to the second gradually widening channel 230 is realized.

As shown in fig. 13, during the flow of the mixture from the first gradually widening channel 210 to the second gradually widening channel 230, this prevents the mixture from generating mutually-destructive vortices in the left and right spaces under the influence of the pressure field. The problems of side-to-side and flame side-to-side of the air flow of the mixed gas are solved, and the combustion of the flame is stable.

In other embodiments, the fire grate 10 further includes a combustion channel 240, wherein a lower end of the combustion channel 240 is communicated with an upper end of the second gradually-widened channel 230, and extends upward from the upper end of the second gradually-widened channel 230, and lower ends of two side walls 241 of the combustion channel are respectively connected with upper ends of two side walls 231 of the second gradually-widened channel, and the two side walls 241 of the combustion channel are respectively provided with a plurality of flame stabilizing holes 243.

The main flame hole part 250 is disposed at the top of the combustion channel 240, and the main flame hole part 250 has a plurality of groups of main flame holes 251 disposed at intervals along the introduction direction; each flame stabilizing hole 243 is adapted to the size of each group of main flame holes 251 in the direction of introduction.

As shown in fig. 12, the mixture gas easily swirls on the left and right sides in the process of flowing upward, which causes the flame to sway left and right. The two side walls 241 of the combustion channel, that is, the left and right side walls of the combustion channel 240 are provided with a plurality of flame stabilizing holes 243, and the gas generating the vortex in the mixed gas flows out from the flame stabilizing holes 243 on the left and right sides into the auxiliary channel and reaches the auxiliary flame holes through the auxiliary channel. The remaining mixture passes through the combustion passage 240 to reach the main flame hole portion 250. As shown in fig. 13, the gas mixture due to the vortex enters the auxiliary passage through the flame stabilizing hole part and forms a wrap for the gas at the main flame hole 251. Therefore, the shielding portion 242 and the flame stabilizing hole portion cooperate to prevent the flame from swinging left and right.

In other embodiments, the area of each flame stabilizing aperture 243 is in the range of 25% to 35% of the area of each set of main flame apertures 251. As shown in fig. 13, this makes the air flow velocity at the flame stabilizing hole 243 match the air flow velocity at the main flame hole 251, so as to solve the technical problem of the left-right swing of the flame hole, which is beneficial to ensuring the stability of combustion.

In other embodiments, the area of each flame stabilizing aperture 243 is in the range of 25% to 35% of the area of each set of main flame apertures 251. As shown in fig. 13, the airflow speed in the auxiliary channel is matched with the airflow speed in the combustion channel 240, so that the mixed gas in the auxiliary channel forms a better package on the gas at the main flame hole 251, and the combustion of the flame is more stable.

In other embodiments, the area of each flame stabilizing aperture 243 is 30% of the area of each set of main flame apertures 251. As shown in fig. 13, the airflow speed in the auxiliary channel is matched with the airflow speed in the combustion channel 240, so that the mixed gas in the auxiliary channel forms a better package on the gas at the main flame hole 251, and the combustion of the flame is more stable.

In other embodiments, the two side walls 241 of the combustion channel respectively have shielding portions 242 adapted to the main flame holes 251, wherein the shielding portions 242 are located above the flame stabilizing holes 243 so that part of the air flow in the combustion channel 240 flows out from the flame stabilizing holes 243.

The shape and number of the shielding portions 242 are not limited, and the shielding portions 242 may be selected as needed, and the shielding portions 242 may be adapted to the main flame holes 251. As a specific example, as shown in fig. 4, the shielding portion 242 is formed by recessing the fire grate plate inward, and specifically, the fire grate plate is punched inward to form the shielding portion 242. The shielding portion 242 is adapted to the main flame holes 251, i.e. the dimension of the shielding portion 242 along the length direction of the fire grate 10 is identical to the dimension of the main flame holes 251 along the length direction.

The shielding portion 242 is used for enabling the mixture to be smoothly split. The swirling mixture gas passes through the flame stabilizing hole 243 and then enters the auxiliary passage, and reaches the auxiliary flame hole through the auxiliary passage. The remaining mixture passes through the combustion passage 240 to reach the main flame hole portion 250. As shown in fig. 13, the gas mixture due to the vortex enters the auxiliary passage through the flame stabilizing hole part and forms a wrap for the gas at the main flame hole 251. Therefore, the shielding portion 242 and the flame stabilizing hole portion cooperate to prevent the flame from swinging left and right.

In other embodiments, as shown in fig. 3 to 4, the dimension of the shielding portion 242 in the height direction of the fire row 10 is 2 mm or more. That is, the distance from the bottom of the shielding portion 242 to the top of the shielding portion 242 is 2 mm or more. The distance between the shielding part 242 and the flame stabilizing hole part is larger than 1 mm. This facilitates the molding of the fire grate 10, i.e., facilitates die cutting to form the flame holding hole portion, and punching to form the shielding portion 242.

In other embodiments, the shielding portion 242 is formed by inwardly recessing both side walls 241 of the combustion channel, respectively, and the depth of the inward recessing of the shielding portion 242 is in the range of 9% to 14% of the size of the main flame hole 251 in the width direction of the main flame hole portion 250. In the present embodiment, the specific manner in which the both side walls 241 of the combustion channel are recessed inwardly is not limited. For example, both side walls 241 of the combustion channel are punched inwardly such that both side walls 241 of the combustion channel are recessed inwardly. Too small inward concave size of the shielding part 242 can prevent the flame from swinging left and right, and too large inward concave size of the shielding part 242 can cause uneven speed distribution of the single main flame hole 251 because the gas mixture gathers at the shielding part 242 and flows to the main flame hole 251.

According to a second aspect of the invention, the invention also provides a burner 20, the burner 20 comprising a fire row 10 for a burner 20 as in any one of the above. Since the burner 20 includes the fire grate 10 according to any one of the above, the burner 20 has the technical effects of any one of the fire grate 10 described above, and will not be described in detail herein.

According to a third aspect of the present invention, the present invention also provides a water heater 1, the water heater 1 comprising the burner 20 described above. Since the water heater 1 includes the above-mentioned burner 20, the water heater 1 has the technical effects of the above-mentioned burner 20, and will not be described in detail herein.

In the description of the present embodiment, it should 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", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature, i.e. one or more such features. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. When a feature "comprises or includes" a feature or some of its coverage, this indicates that other features are not excluded and may further include other features, unless expressly stated otherwise.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," "coupled," and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. Those of ordinary skill in the art will understand the specific meaning of the terms described above in the present invention as the case may be.

Furthermore, in the description of the present embodiments, a first feature "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature therebetween. That is, in the description of the present embodiment, the first feature being "above", "over" and "upper" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature "under", "beneath", or "under" a second feature may be a first feature directly under or diagonally under the second feature, or simply indicate that the first feature is less level than the second feature.

Unless otherwise defined, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the description of the present embodiment, a description referring to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described herein in detail, many other variations or modifications of the invention consistent with the principles of the invention may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A fire grate for a burner, comprising:

an injection passage having a fire row inlet formed at a first side of the fire row and arranged to be opposed to the gas supply port, the injection passage extending in an introduction direction in which the gas is introduced into the fire row inlet;

a curved passage having a first end communicating with the downstream end of the injection passage and a second end curved toward the first side of the fire row;

a flow dividing chamber communicating with the curved passage, an upper side thereof extending toward flame holes of the fire row, comprising:

and the pressing part is arranged close to the bending channel and is used for enabling the interval of the diversion chamber at the pressing part to be smaller.

2. The fire grate for a burner of claim 1 wherein,

the bending channel is provided with a strip-shaped communication part, the diversion chamber is communicated with the bending channel through the communication part, two side walls of the diversion chamber are arranged on two sides of the communication part along the width direction of the communication part, and the two side walls of the diversion chamber are inwards recessed to form the pressing part.

3. The fire grate for a burner of claim 2 wherein,

the depth of the inward recess of the pressing part accounts for 5 to 15 percent of the distance between the two side walls of the diversion chamber.

4. The fire grate for a burner of claim 2 wherein,

the pressure portion extends from the communication portion toward the flame holes of the fire row.

5. The fire grate for a burner of claim 4 wherein,

the shape of the pressing part and the shape of the communicating part are all arc-shaped, the communicating part is arranged along the peripheral wall of the bending channel, and the pressing part is arranged along the length direction of the communicating part.

6. A fire grate for a burner as recited in claim 5 wherein,

the length value of the pressing portion in the extending direction thereof is in the range of 30% to 70% of the length value of the pressing portion in the length direction of the communicating portion.

7. The fire grate for a burner of claim 2 wherein,

the first end of the communicating portion along the length direction thereof is adjacent to the first side of the curved passage, and the first end of the communicating portion is located downstream of the apex of the curved passage.

8. The fire grate for a burner of claim 7 wherein,

the lower side wall of the diversion chamber extends from the first end of the communication portion toward a second side of the fire row, the second side of the fire row being opposite to the first side of the fire row;

the included angle between the lower side wall of the diversion chamber and the second side of the fire row is larger than the included angle between the connecting line of the lower side of the first end of the bending channel and the tail end of the extending end of the lower side wall of the diversion chamber and the second side of the fire row.

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

10. A water heater comprising a burner as claimed in claim 9.