CN218494983U - Fire grate for burner, burner and water heater - Google Patents

Abstract

The utility model provides a fire row, combustor and water heater for combustor, wherein, the fire row includes main flare portion and burning passage. The main flame hole part is shaped like a strip, and the length of the main flame hole part is along the length direction of the fire row and is provided with at least one group of main flame holes. The combustion channel is used for arranging the main flame hole part at the top of the combustion channel, and two side walls of the combustion channel are respectively arranged at two sides of the main flame hole part along the width direction of the main flame hole part and extend downwards from the main flame hole part. And two side walls of the combustion channel are respectively provided with a flame stabilizing hole part and a shielding part which are matched with the main flame hole part, wherein the shielding part is positioned above the flame stabilizing hole part so that part of air flow in the combustion channel flows out from the flame stabilizing hole. The mixed gas generated by the vortex enters the auxiliary channel through the flame stabilizing hole part and forms a package for the gas at the main flame hole. Therefore, the shielding part is matched with the flame stabilizing hole part, so that the flame can be prevented from swinging left and right.

Description

Fire grate for burner, burner and water heater

Technical Field

The utility model relates to a water heater field especially relates to a fire row, combustor and water heater for combustor.

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. Generally, the mixture flows from a small size to a large size through the diverging portion into the first gradually widening passage. Under the action of the pressure field, the mixed gas generates a reversed vortex in the left and right spaces, which causes the mixed gas flow and the flame to swing left and right, and causes poor combustion stability of the fire grate.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fire row, combustor and water heater for the combustor for solve above-mentioned technical problem.

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

the main flame hole part is in a strip shape, the length of the main flame hole part is along the length direction of the fire grate, and at least one group of main flame holes are formed;

the combustion channel is used for enabling the main flame hole part to be arranged at the top of the combustion channel, two side walls of the combustion channel are respectively arranged at two sides of the main flame hole part along the width direction of the main flame hole part and extend downwards from the main flame hole part, two side walls of the combustion channel are respectively provided with a flame stabilizing hole part and a shielding part matched with the main flame hole part, and the shielding part is located above the flame stabilizing hole part so that partial airflow in the combustion channel can flow out from the flame stabilizing hole part.

Optionally, the size of the shielding portion in the fire row height direction is greater than or equal to 2 mm.

Optionally, a distance between the shielding portion and the flame stabilizing hole portion is greater than 1 mm.

Optionally, the shielding portions are formed by inwardly recessing both side walls of the combustion channel, respectively, and the depth of the inwardly recessing shielding portions is in a range of 9% to 14% of the size of the main flame holes in the width direction of the main flame hole portion.

Optionally, a plurality of groups of main flame holes are arranged at intervals along the length direction of the fire grate;

the flame stabilizing hole parts are a plurality of flame stabilizing holes which are respectively arranged on two side walls of the combustion channel, and each flame stabilizing hole is arranged in one-to-one correspondence with each group of main flame holes;

each flame stabilizing hole is matched with the size of each group of main flame holes along the length of the fire row.

Optionally, the area of each of the flame stabilizing holes is in the range of 25% to 35% of the area of each of the main flame holes.

Optionally, the area of each flame stabilizing hole accounts for 30% of the area of each group of main flame holes.

Optionally, the fire row for a burner further comprises:

the upper end of the second gradually widening channel is communicated with the lower end of the combustion channel and is contracted and extended downwards from the lower end of the combustion channel, the upper ends of two side walls of the second gradually widening channel are respectively arranged on the lower ends of two side walls of the combustion channel, and the included angle of the planes of the two side walls is smaller than 90 degrees;

the upper end of the connecting channel is communicated with the lower end of the second gradually widening channel and extends downwards from the lower end of the second gradually widening channel, the upper ends of two side walls of the connecting channel are respectively connected with the lower ends of two side walls of the second gradually widening channel, and the included angle of the surfaces of the two side walls is 90 degrees;

the upper end of the first gradually-widening channel is communicated with the lower end of the connecting channel and is contracted and extended downwards from the lower end of the connecting channel, the upper ends of the two side walls of the first gradually-widening channel are respectively communicated with the lower ends of the two side walls of the connecting channel, and the included angle of the surfaces of the two side walls is 90 degrees.

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

According to a third aspect of the present invention, the present invention further provides a water heater, which comprises the above burner.

The utility model provides a fire row, combustor and water heater for combustor, wherein, the fire row includes main flame hole portion and burning channel. The main flame hole part is shaped like a strip, and the length of the main flame hole part is along the length direction of the fire row and is provided with at least one group of main flame holes. The combustion channel is used for arranging the main flame hole part at the top of the combustion channel, and two side walls of the combustion channel are respectively arranged at two sides of the main flame hole part along the width direction of the main flame hole part and extend downwards from the main flame hole part. And two side walls of the combustion channel are respectively provided with a flame stabilizing hole part and a shielding part which are matched with the main flame hole part, wherein the shielding part is positioned above the flame stabilizing hole part so that part of air flow in the combustion channel flows out from the flame stabilizing hole. The mixed gas generated by the vortex enters the auxiliary channel through the flame stabilizing hole part and forms a package for the gas at the main flame hole. Therefore, the shielding part is matched with the flame stabilizing hole part, so that the flame can be prevented from swinging left and right.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

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

fig. 2 is a schematic view of a fire row from another perspective according to an embodiment of the invention;

fig. 3 is an exploded view of a fire grate in accordance with an embodiment of the present invention;

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

fig. 5 is a cross-sectional view of a fire grate from another perspective in accordance with an 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 at C of FIG. 6;

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

FIG. 9 is a simulated view of a fire grate without a press section according to one embodiment of the present invention;

fig. 10 is a simulation of a fire grate with a press portion according to an embodiment of the present invention;

FIG. 11 is a velocity diagram of the flame holes of a fire grate with a press according to one embodiment of the present invention;

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

fig. 13 is a flow field simulation diagram of a combustion portion of a fire grate in accordance with an embodiment of the present invention.

Detailed Description

Fig. 1 is a schematic view of a fire grate in accordance with an embodiment of the present invention; fig. 2 is a schematic view of a fire row from another perspective according to an embodiment of the invention; fig. 3 is an exploded view of a fire grate in accordance with an embodiment of the present invention; fig. 4 is a cross-sectional view of a fire grate in accordance with an embodiment of the present invention;

fig. 5 is a cross-sectional view of a fire row from another perspective according to an embodiment of the 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 at C of FIG. 6;

fig. 8 is a schematic view of a water heater according to an embodiment of the present invention; FIG. 9 is a simulated view of a fire grate without a press section according to one embodiment of the present invention; fig. 10 is a simulation of a fire grate with a press portion according to an embodiment of the present invention; FIG. 11 is a velocity diagram of the flame holes of a fire grate with a press according to one embodiment of the present invention; FIG. 12 is a flow field simulation of the combustion portion of a prior art fire grate in accordance with the present invention; fig. 13 is a flow field simulation diagram of a combustion portion of a fire grate in accordance with an embodiment of the present invention.

The present embodiment provides a fire row 10 for a burner 20, as shown in fig. 1, the fire row 10 includes a fire row body 30 and a fire cap 40, and the fire cap 40 is covered and buckled above the fire row body 30 and forms an auxiliary channel with the fire row body 30. The fire grate body 30 includes a diverging portion 100 and a combustion portion 200, and the diverging portion 100 serves to deliver gas and air to the combustion portion 200. The flow dividing portion 100 includes an injection passage 110, a curved passage 120, a flow dividing passage 130, and a flow dividing chamber 140. The combustion portion 200 includes a first gradually-widening passage 210, a connection passage 220, a second gradually-widening passage 230, a combustion passage 240, and a main flame hole portion 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 water heater, that is, the fan is located below the water heater 1. It will be clear that this is exemplary only and not exclusive. For example, the water heater 1 may be a draw-up 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 fire rows 10 are arranged in parallel inside the water heater 1.

In the present embodiment, the formation manner of the flow dividing portion 100 and the combustion portion 200 is not limited, and may be selected as needed. For example, the flow dividing portion 100 and the combustion portion 200 may be cast molded of the burner block body 30. As a specific example, as shown in fig. 2 to 5, the fire grate body 30 is formed by two fire grate segments having a specific shape, which are engaged with each other, so that the fire grate 10 forms the flow dividing portion 100, the combustion portion 200, and the like. The specific shape of the fire grate segment can be post-stamping and die-cutting forming or casting forming.

The characteristic shape of the fire row sheets is not particularly limited, and the fire row sheets can form the injection passage 110, the bent passage 120, the flow distribution passage 130, the combustion passage 240 and the like after being buckled. The specific shape of the fire row sheets is related to the shapes of the injection channel 110, the bent channel 120, the branch channel 130 and the combustion channel 240, and the fire row sheets with specific shapes are punched or cast according to the specific shapes of the injection channel 110, the bent channel 120, the branch channel 130, the combustion channel 240 and the like.

The shape of the main flame hole part 250 is a long strip, the length of the main flame hole part 250 is along the length direction of the fire row 10, and the main flame hole part 250 has at least one group of main flame holes.

The combustion channel 240 is used to arrange the main flame hole part 250 at the top thereof, and two side walls 241 of the combustion channel are respectively arranged at both sides of the main flame hole part 250 in the width direction thereof and extend downward from the main flame hole part 250. The two side walls 241 of the combustion channel are respectively provided with a flame stabilizing hole part and a shielding part 242 matched with the main flame hole 251, wherein the shielding part 242 is positioned above the flame stabilizing hole part so that part of the airflow in the combustion channel 240 flows out of the flame stabilizing hole 243.

In this embodiment, the shape and type of the main flame holes 251 of the fire grate 10 are not limited, and may be selected as desired. As a specific example, as shown in fig. 2 to 6, the fire grate 10 has a plurality of groups of main flame holes, and the plurality of groups of main flame holes are spaced from the rear side of the fire grate 10 to the front side of the fire grate 10. From the rear side of the fire grate 10 to the front side of the fire grate 10, the multiple groups of main flame holes are sequentially called as a first group of main flame holes, a second group of main flame holes, a third group of main flame holes, a fourth group of main flame holes and the like. The number of the main flame holes 251 included in each group of the main flame holes is not limited, and can be selected according to the requirement. As a specific example, as shown in fig. 2, the first group of main flame holes and the group of main flame holes near the front side of the fire row 10 include three main flame holes 251, and each group of main flame holes among them includes four main flame holes 251. As a specific example, as shown in fig. 4 and 5, the flame holes include a main flame hole 251 and auxiliary flame holes 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.

In the present embodiment, the forming manner of the combustion channel 240 is not limited, and may be selected according to the requirement. As a specific example, two fire segments projecting outwardly snap together to form a combustion channel 240, as shown in FIGS. 4 and 5. The mixture of gas and air passes through the combustion passage 240 to the flame holes for combustion.

As shown in fig. 4 and 5, two side walls 241 of the combustion channel are the left and right side walls of the combustion channel 240, and two sides of the main flame hole part 250 in the width direction are the left and right sides of the main flame hole part 250. Both side walls 241 of the combustion passage are respectively provided at both sides of the main flame hole portion 250 in the width direction thereof, that is, both left and right side walls of the combustion passage 240 are respectively provided at both left and right sides of the main flame hole portion 250.

In this embodiment, the shape and number of the flame stabilizing hole portions are not limited, and may be selected according to the requirement, and the flame stabilizing hole portions are adapted to the main flame holes 251. The shape and number of the shielding portion 242 are not limited, and may be selected according to the requirement, and the shielding portion 242 may be adapted to the main flame hole portion 250. As a specific example, as shown in fig. 3, the flame stabilizing hole part includes a plurality of flame stabilizing holes 243 spaced along the length direction of the fire row 10. As shown in fig. 4, the shielding portion 242 is formed by inwardly recessing fire grate segments, and in particular, the fire grate segments are inwardly punched to form the shielding portion 242. The flame stabilizing hole portions and the shielding portions 242 are matched with the main flame hole portions 250, that is, the size of the flame stabilizing hole portions and the shielding portions 242 along the length direction of the fire row 10 is consistent with the size of the main flame hole portions 250 along the length direction.

When the air-fuel mixture flows from the flow dividing portion 100 to the combustion portion 200, the air-fuel mixture flows from the small-sized flow path to the large-sized flow path, and as shown in fig. 12, the air-fuel mixture is likely to swirl on the left and right sides by the pressure field. The two side walls 241 of the combustion channel have flame stabilizing hole portions, the air flow of the mixture starts to be divided from the flame stabilizing hole portions, and the shielding portion 242 is used for enabling the mixture to be smoothly divided. The mixed gas generating the vortex enters the auxiliary channel after passing through the flame stabilizing hole part and reaches the auxiliary flame holes through the auxiliary channel. The remaining mixture passes through the combustion passage 240 to the primary flare portion 250. As shown in fig. 13, the mixture gas due to the vortex generation enters the auxiliary passage through the flame stabilizing hole portion 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 size of the shielding portion 242 in the fire row 10 height direction is greater than or equal to 2 mm. That is, the distance from the bottom of the shielding portion 242 to the top of the shielding portion 242 is greater than or equal to 2 mm. The distance between the shielding part 242 and the flame stabilizing hole part is greater than 1 mm. This facilitates the formation of the fire grate 10.

In other embodiments, the shielding portions 242 are formed by inwardly recessing both sidewalls 241 of the combustion channel, respectively, and the depth of the inwardly recessing shielding portions 242 is in the range of 9% to 14% of the size of the main flame holes 251 in the width direction of the main flame hole portion 250. In the present embodiment, the specific manner of the two sidewalls 241 of the combustion channel being recessed inwards is not limited. For example, the two side walls 241 of the combustion channel are punched inwardly such that the two side walls 241 of the combustion channel are recessed inwardly. If the shielding portion 242 is recessed inward to a small extent, the effect of preventing the flame from swinging left and right is not obvious, and if the shielding portion 242 is recessed inward to a large extent, the mixture gas flows to the main flame holes 251 after gathering at the shielding portion 242, which may cause uneven velocity distribution of the single main flame hole 251.

In other embodiments, multiple groups of primary flame holes are spaced along the length of the fire grate 10; the flame stabilizing hole parts are a plurality of flame stabilizing holes 243 respectively formed in the two side walls 241 of the combustion channel, and each flame stabilizing hole 243 is arranged in one-to-one correspondence with each group of main flame holes. Each of the flame stabilizing holes 243 is adapted to the size of each group of main flame holes along the length of the fire row 10. This allows the mixture in the auxiliary passage to form a better envelope of the gas at the main flame holes 251 and allows the mixture that generates the vortex in the combustion passage 240 to be discharged from the flame stabilizing hole portion in time, thus making the combustion of the flame more stable.

In other embodiments, the area of each of the flame stabilizing holes 243 is in a range of 25% to 35% of the area of each of the main flame holes. This allows the air flow velocity in the secondary channel to be matched to the air flow velocity in the combustion channel 240, as shown in fig. 13, so that the mixture in the secondary channel forms a better envelope for the gas at the primary flame holes 251, and the flame is more stable to burn.

In other embodiments, the area of each flame stabilizing hole 243 is 30% of the area of each group of main flame holes. This allows the velocity of the gas flow in the secondary channel to be matched to the velocity of the gas flow in the combustion channel 240, so that the mixture in the secondary channel forms a better envelope for the gas at the primary flame holes 251, and the combustion of the flame is more stable.

In some other embodiments, the upper ends of the second gradually widening channel 230 are communicated with the lower end of the combustion channel 240 and extend from the lower end of the combustion channel 240 in a downward converging manner, the upper ends of the two side walls of the second gradually widening channel 230 are respectively arranged at the lower ends of the two side walls 241 of the combustion channel, and the included angle between the planes of the two side walls of the second gradually widening channel 230 is less than 90 °.

The upper end of the connecting channel 220 is connected to the lower end of the second gradually widening channel 230 and extends downwards from the lower end of the second gradually widening channel 230, the upper ends of the two side walls 221 of the connecting channel are respectively connected to the lower ends of the two side walls 231 of the second gradually widening channel, and the included angle between the surfaces of the two side walls 221 of the connecting channel is 90 °.

The upper end of the first gradually widening channel 210 is communicated with the lower end of the connecting channel 220, and is contracted and extended downwards from the lower end of the connecting channel 220, the upper ends of the two side walls of the first gradually widening channel 210 are respectively communicated with the lower ends of the two side walls 221 of the connecting channel, and the included angle of the two side walls of the first gradually widening channel 210 is 90 degrees.

The lower end of the first gradually widening channel 210 communicates with the diverging portion through the second long slit section 131 on the diverging channel 130 and the slit 143 on the diverging chamber 140, respectively. Specifically, the lower ends of the first gradually widening passages 210 are respectively communicated with the flow dividing passage 130 through the second long slit sections 131 on the flow dividing passage 130. The lower end of the first diverging passage 210 communicates with the diverging chamber through the slit 143 on the diverging chamber 140.

As shown in fig. 4 to 6, the flow dividing portion 100 to the first gradually widening channel 210, and the first gradually widening channel 210 to the second gradually widening channel 230 are from a small flow passage to a large flow passage. If the included angle between the surfaces of the two sidewalls 211 of the first gradually widening channel and the included angle between the surfaces of the two sidewalls 231 of the second gradually widening channel are too large, as shown in fig. 12, the mixed gas generates a vortex with a length equal to that of the mixed gas in the left and right spaces under the action of the pressure field. As shown in fig. 12, this results in side-to-side rocking of the mixture gas flow, that is, it results in side-to-side rocking of the flame.

The included angle of the surface of the two side walls 211 of the first gradually-widening channel and the included angle of the surface of the two side walls 231 of the second gradually-widening channel are both smaller than 90 degrees, and the included angle of the surface of the two side walls 211 of the first gradually-widening channel and the included angle of the surface of the two side walls 231 of the second gradually-widening channel are both smaller. As shown in fig. 13, this avoids the mixture from generating a negative vortex in the left and right spaces under the action of the pressure field, which solves the problems of the air flow of the mixture and the flame from side to side, so that the combustion of the flame is relatively stable.

In other embodiments, the angle between the surfaces of the sidewalls 211 of the first gradually widening channel is 30 °. This solves the air flow side-to-side and flame side-to-side problems of the mixture, as shown in fig. 13, so that the combustion of the flame is relatively stable.

In other embodiments, the included angle between the two sidewalls 211 of the first gradually widening channel is smaller than the included angle between the two sidewalls 231 of the second gradually widening channel.

The mixed gas 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 between the surfaces of the two side walls 211 of the first gradually widening channel is smaller than the included angle between the surfaces of the two side walls 231 of the second gradually widening channel, that is, the mixed gas gradually widens from the first gradually widening channel 210 to the second gradually widening channel 230. In the process that the mixture flows from the first gradually-widening channel 210 to the second gradually-widening channel 230, as shown in fig. 13, this avoids the mixture generating a rather long vortex in the left and right space under the action of the pressure field, which solves the problems of the air flow of the mixture swaying left and right and the flame swaying left and right, so that the combustion of the flame is relatively stable.

In other embodiments, the injection passage 110 includes a converging passage section 111 and a mixing passage section 112, the converging passage section 111 has a fire discharge port 114 for being disposed opposite to the gas supply port, and the converging passage section 111 extends in an introduction direction of the gas into the fire discharge port 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 grate 10 forms a smooth arc-shaped inner wall at the junction of the converging channel segment 111 and the mixing channel segment 112.

The fire discharge inlet 114 is disposed opposite to the gas supply port, that is, the fire discharge inlet 114 faces the gas supply port. 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 faces the rear side of the water heater 1, and the fire grate inlet 114 faces the front side of the water heater 1. The fire exhaust inlet 114 is opposite to the gas supply port, and gas sprayed from the gas pipeline enters the fire exhaust 10 through the fire exhaust inlet 114. The shape of the fire discharge port 114 is not limited and may be selected as desired. As a specific example, as shown in fig. 1 to 3, the fire discharge port 114 has a shape of a long circle.

The introduction direction of the combustion gas into the fire row inlet 114 is the direction from the first side of the fire row 10 to the second side of the fire row 10, i.e. the length direction of the fire row 10. As a specific example, the first side of the fire row 10 refers to the front side of the fire row 10, and the second side of the fire row 10 refers to the rear side of the fire row 10.

The converging channel section 111 extends in the direction of introduction of the gas introduction fire inlet 114. That is, the constricted channel section 111 extends from the front side to the rear side of the fire row 10. That is, the converging channel section 111 extends along the length of the fire row 10. That is, the combustion gas flows from the fire discharge inlet 114 to the end of the converging channel section 111 in the direction of extension thereof. Therefore, 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 discharge inlet 114 is the downstream end of the constricted passage section 111.

In the present embodiment, the formation manner of the contraction passage section 111 is not limited. As a specific example, as shown in FIG. 2, two fire grate segments snap together to form fire grate 10 and project outwardly to form a converging channel section 111.

The two ends of the mixing channel segment 112 in its direction of extension are its first and second ends, respectively. Wherein the first end of the mixing channel segment 112 is close to the front side of the water heater 1 and the first end of the mixing channel segment 112 is connected to the downstream end of the converging channel segment 111. The combustion gases flow from the first end of the mixing channel section 112 to the second end of the mixing channel section 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 grate 10 forms a smooth arc-shaped inner wall at the junction of the convergent channel section 111 and the mixing channel section 112, i.e., the junction of the downstream end of the convergent channel section 111 and the upstream end of the mixing channel section 112. This results in less resistance to the flow of combustion gases through the converging channel section 111 and the mixing channel section 112 into the fire grate 10, i.e. it results in an easier flow of the mixture from the converging channel section 111 to the mixing channel section 112, i.e. it results in less resistance to the flow of the mixture from the converging channel section 111 to the mixing channel section 112. This also makes the gas easily inject the air into the shrink tunnel section 111, this promptly, this has increased the injection coefficient that the gas jetted primary air.

In other embodiments, as shown in FIGS. 1 and 3, the downstream end of the converging channel section 111 is tangent to the upstream end of the mixing channel section 112 such that the fire grate 10 forms a smooth arc-shaped inner wall at the junction of the converging channel section 111 and the mixing channel section 112. This makes the gas through contraction passage section 111 and mixing passage section 112 when getting into in the fire row 10 resistance less, also makes the gas easily inject the air into contraction passage section 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 a tangential direction. This makes the resistance when gas passes through convergent channel section 111 and mixing channel section 112 and gets into in the fire row 10 less, also makes gas easily inject the air into convergent channel section 111.

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

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

In other embodiments, the converging channel section 111 gradually converges in the introduction direction, the diverging channel section 113 gradually diverges in the introduction direction, and the mixing channel section 112 is identical in the introduction direction along a cross-section perpendicular to the introduction direction.

The contraction passage section 111 gradually contracts in the introduction direction, and the gradual contraction of the contraction passage section 111 can reduce the resistance of the gas flow and simultaneously enable the gas and the air to be gradually mixed. The mixing channel segments 112 are identical in the introduction direction along a cross section perpendicular to the introduction direction, i.e. the cross section of the mixing channel segments 112 is constant along its extension direction. This allows the mixture of gas and air to be sufficiently mixed therein. The expanding channel section 113 gradually expands along the introduction direction, and the mixture enters the expanding channel from the narrower mixing channel to further promote the mixing of the mixture.

In other embodiments, the length of the mixing channel section 112 is 1.5 to 2.5 times the length of the converging channel section 111 and the length of the mixing channel section 112 is 1.5 to 2.5 times the length of the diverging channel section 113. This enables the mixture gas to be sufficiently mixed.

In other embodiments, the converging channel section 111 is oblong in cross-section perpendicular to the introduction direction. This results in a smaller angle of the constricted passage section 111 and less resistance to the mixture, and 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 has an elliptical shape in cross-section perpendicular to the direction of introduction. This results in a smaller edge angle of the mixing channel section 112 and less resistance to the mixture, while at the same time this results in a smaller width of the mixing channel section 112 and a reduced volume of the water heater 1.

Based on the above description, the fire grate 10 includes the injection passage 110 and the curved passage 120, the injection passage 110 has a fire grate inlet 114 formed at a first side of the fire grate 10 for being disposed opposite to the gas supply port, and the injection passage 110 extends in an introduction direction in which the gas is introduced into the fire grate inlet 114.

The first end of the curved passage 120 is communicated with the downstream end of the injection passage 110, the second end of the curved passage 120 is curved towards the first side of the fire grate 10, the vertex 121 of the curved passage is spaced from the second side of the fire grate 10, the second side of the fire grate 10 is opposite to the first side of the fire grate 10, and the proportion of the distance of the spacing along the leading-in direction to the overall distance of the fire grate 10 along the leading-in direction is more than 10%.

In the present embodiment, the first side of the fire row 10 refers to the side of the fire row 10 for forming the fire row inlet 114. As a specific example, the first side of the fire row 10 refers to the front side of the fire row 10, and the 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 to the gas supply port, that is, the fire discharge inlet 114 faces the gas supply port. 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 port 114 is directed to the front side of the water heater 1.

The fire exhaust inlet 114 is opposite to the gas supply port, and gas sprayed from the gas pipeline enters the fire exhaust 10 through the fire exhaust inlet 114. The shape of the fire discharge port 114 is not limited and may be selected as desired. As a specific example, as shown in fig. 1 to 3, the fire discharge port 114 has a shape of a long circle.

The direction of introduction of the combustion gas into the fire row inlet 114 is also the longitudinal direction of the fire row 10. As a specific example, the first side of the fire row 10 refers to the front side of the fire row 10, the second side of the fire row 10 refers to the rear side of the fire row 10, and the introduction direction of the gas into the fire row inlet 114 is the direction from the first side of the fire row 10 to the second side of the fire row 10. The injection passage 110 extends in the direction of introduction of the gas introduction fire grate inlet 114, i.e. the injection passage 110 extends from the front side to the rear side of the fire grate 10, i.e. the injection passage 110 extends in the length direction of the fire grate 10, i.e. the gas flows from the fire grate inlet 114 to the end of the injection passage 110 in the direction of extension thereof. Therefore, 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 channel 120 and the second end of the curved channel 120 are both ends of the curved channel 120 in its extending direction, that is, both ends of the curved channel 120 in its flow direction. The first end of the curved passage 120 communicates with the downstream end of the injection passage 110, that is, the mixture flows into the curved passage 120 from the first end of the curved passage 120. The distance of the gap in the introduction direction is greater than 10% of the overall distance of the fire grate 10 in the introduction direction, i.e. the distance of the gap in the introduction direction is greater than 10% of the length of the fire grate 10.

The apex 121 of the curved passage is spaced from the second side of the fire bank 10 by a distance in the lead-in direction that is greater than 10% of the distance of the fire bank 10 along its length. This can solve the fire and arrange 10 first side air current reposition of redundant personnel less, fire and arrange 10 first side and fire and arrange 10 second side uneven technical problem of air current. This makes the airflow of each flame hole at the top of the fire row 10 more uniform and the combustion stability is good.

In other embodiments, the spacing along the direction of introduction may range from 20% to 50% of the overall distance of the fire bank 10 along the direction of introduction. That is, the distance in the introduction direction is spaced in a range of 20% to 50% of the length of the fire row 10. This can solve the fire and arrange 10 first side air current reposition of redundant personnel few, fire arrange 10 first side and fire arrange 10 second side uneven technical problem of side air current. This makes the airflow of each flame hole at the top of the fire row 10 more uniform and the combustion stability is good.

In other embodiments, the distance along the direction of introduction is 30% of the total distance of the fire row 10 along the direction of introduction. That is, the distance in the introduction direction is 30% of the length of the fire row 10. This can solve the fire and arrange 10 first side air current reposition of redundant personnel few, fire arrange 10 first side and fire arrange 10 second side uneven technical problem of side air current. This makes the airflow of each flame hole at the top of the fire row 10 more uniform and the combustion stability is good.

In other embodiments, the fire row 10 for the burner 20 further includes a flow dividing channel 130, a first end of the flow dividing channel 130 communicates with a second end of the curved channel 120, and the second end of the flow dividing channel 130 extends toward the first side of the fire row 10. The first end and the second end of the branch passage 130 are two ends of the branch passage 130 along the flowing direction thereof, and in the present embodiment, the mixture flows from the first end of the branch passage 130 to the second end of the branch passage 130.

As shown in fig. 5-7, the tortuous channel 120 and the diversion channel 130 have an elongated slot extending from the tortuous channel 120 toward the second end of the diversion channel 130. That is, the long slit starts on the meandering channel 120 and extends to the diversion channel 130 along the extending direction of the meandering channel 120. That is, a first end of the long slit along its length is positioned on the curved passage 120, and a second end of the long slit along its length is positioned on the branch passage 130. In this embodiment, the specific forming manner of the long slit is not limited, and can be selected according to the needs. As a specific example, the long slit is formed by a gap between two fire flaps.

The elongated slots are used to communicate the curved channels 120 and the branch channels 130 with the flame ports of the fire row 10, and their width increases along the extension direction thereof. That is, the mixture gas in the curved passage 120 and the branch passage 130 flows out through the long slits toward the flame holes of the fire row 10. The width of the long slit increases along the extending direction of the long slit, namely the width of the long slit continuously increases in the process of the long slit from the first end to the second end of the long slit. This can solve the fire and arrange 10 first side air current reposition of redundant personnel few, fire arrange 10 first side and fire arrange 10 second side uneven technical problem of side air current. This makes the airflow of each flame hole at the top of the fire row 10 more uniform and the combustion stability is good.

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 tortuous path. That is, the beginning of the long slit is located on the upper side of the apex 121 of the curved channel. This can solve the fire and arrange 10 first side air current reposition of redundant personnel few, fire arrange 10 first side and fire arrange 10 second side uneven technical problem of side air current. This makes the airflow of each flame hole at the top of the fire row 10 more uniform and the combustion stability is good. As shown in fig. 10, a first vortex D is formed at the curved passage 120, and the first vortex D enables the uniformity of mixing gas and air to be high, so as to ensure the uniformity and combustion stability of each flame hole, and improve the technical problem of poor flue gas caused by high gas concentration of the rear flame holes of the conventional fire grate 10.

In other embodiments, the width of the elongated slot increases gradually along its extension. This can solve the fire and arrange 10 first side air current reposition of redundant personnel few, fire arrange 10 first side and fire arrange 10 second side uneven technical problem of side air current. This makes the airflow of each flame hole at the top of the fire row 10 more uniform and the combustion stability is good. This also makes the air current of each fire hole more stable, and the combustion effect is better.

In other embodiments, the fire row 10 for the burner 20 further includes a flow splitting chamber 140, the flow splitting chamber 140 communicating with the curved passage 120, an upper side of the flow splitting chamber 140 extending toward the flame holes of the fire row 10. In this embodiment, the formation manner of the diverting chamber 140 is not limited, and can be selected according to the requirement. As a specific example, the diversion chamber 140 is formed by two fire extinguishing plates that are fastened together. That is, the diversion chamber 140, the injection passage 110, the curved passage 120, etc. are formed by fastening two fire row sheets, that is, the diversion chamber 140, the injection passage 110, the curved passage 120, etc. are integrally formed.

The diverting chamber 140 includes a pressing part 141, the pressing part 141 being disposed near the curved passage 120, the pressing part 141 serving to make an interval of the diverting chamber 140 at the pressing part 141 small. In the present embodiment, the formation form, shape, and the like of the pressing portion 141 are not particularly limited. The pressing portion 141 may reduce the interval of the diverting chamber 140 at the pressing portion 141, that is, the pressing portion 141 may reduce the interval of the first fire damper piece and the second fire damper piece at the pressing portion 141. As a specific example, as shown in fig. 6 and 7, the pressing portion 141 is formed by inwardly recessing both sidewalls of the diverging chamber 140, that is, the pressing portion 141 is formed by inwardly recessing the first fire damper piece and the second fire damper piece at the diverging chamber 140.

In the present embodiment, the shape and type of the flame holes of the fire row 10 are not limited, and can be selected according to the requirement. 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 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, and the like in sequence from the rear side of the fire row 10 to the front side of the fire row 10. The number of the flame holes included in each group of flame holes is not limited and can be selected according to the requirement. 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 fire row 10 include three flame holes, and each group of flame holes among them includes four flame holes.

The diverting chamber 140 includes a pressing portion 141, the pressing portion 141 is disposed near the curved passage 120, and an interval of the diverting chamber 140 at the pressing portion 141 becomes smaller. As shown in fig. 9 and 10, the pressing portion 141 reduces the size of the second swirl E formed in the diverging flow chamber 140 in the longitudinal direction of the fire grate 10. As shown in fig. 11, the pressing portion 141 also makes the air flow velocity higher at the third and fourth groups of flame holes at the rear side of the fire row 10. This ensures the heights of the third and fourth groups of flame holes while reducing the heights of the flames at the first and second groups of flame holes. When the complete machine 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 grate 10 is ensured.

In other embodiments, the long slit comprises a first long slit segment located on the curved channel 120, i.e. the long slit is divided into a first long slit segment and a second long slit segment 131 along its extension direction. Wherein the first long slit segment is located on the curved passage 120, and the second long slit segment 131 is located on the flow dividing passage 130. The diverter chamber 140 communicates with the curved channel 120 through the first long slot segment.

Both side walls of the diverging chamber 140 are disposed at both sides of the first long slit section in the width direction thereof, and both side walls of the diverging chamber 140 are recessed inward to form the pressing portion 141. In the present embodiment, the two sidewalls of the diverting chamber 140 refer to two sidewalls located at the first long slit section in the width direction thereof. As shown in fig. 6 and 7, the two sidewalls of the diversion chamber 140 refer to the left sidewall of the diversion chamber 140 and the right sidewall of the diversion 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 a pressing portion 141. This formation of the pressing portion 141 is simple.

In other embodiments, the depth of the inward depression of the pressing portion 141 is in the range of 5% to 15% of the interval between the both sidewalls of the diverting chamber 140. When the complete machine works, the temperature of the back plate of the water heater 1 can be reduced, damage is reduced, and the uniformity of the whole flame holes of the fire grate 10 is ensured.

In other embodiments, the pressing portion 141 extends from the communication portion toward the flame holes of the fire bank 10. When the complete machine 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 grate 10 is ensured.

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

In other embodiments, the value of the length of pressing portion 141 in its direction of extension ranges from 30% to 70% of the value of the length of pressing portion 141 in the direction of the length of the first long slit segment. This results in a relatively uniform airflow distribution and better combustion stability of the fire bank 10.

In other embodiments, a first end of the first long slit segment along its length is adjacent a first side of the curved channel 120, and the first end of the first long slit segment is downstream of an apex 121 of the curved channel. That is, as shown in fig. 1 and 3, the first end of the first long slit segment is located above the apex 121 of the curved channel.

As shown in fig. 1, the lower side wall 142 of the diverter chamber 140 extends from the first end of the first long slot segment toward the second side of the fire bank 10. The angle between the lower side wall 142 of the diversion chamber 140 and the second side of the fire grate 10 is larger than the angle between the line connecting the lower side of the first end of the curved channel 120 and the end of the extended end of the lower side wall 142 of the diversion chamber 140 and the second side of the fire grate 10.

As shown in fig. 1, the lower side wall 142 of the diverter chamber 140 extends from the first end of the first long slot segment toward the second side of the fire bank 10. The angle between the lower side wall 142 of the diversion chamber 140 and the second side of the fire grate 10 is larger than the angle between the line connecting the lower side of the first end of the curved channel 120 and the end of the extended end of the lower side wall 142 of the diversion chamber 140 and the second side of the fire grate 10. The angle between the lower sidewall 142 of the diverter chamber 140 and the second side of the fire bank 10, i.e., the angle α between the lower sidewall 142 of the diverter chamber 140 and the line segment B on the second side of the fire bank 10. A line connecting the lower side of the first end of the curved channel 120 and the end of the extending end of the lower sidewall 142 of the diversion chamber 140 is also called a line segment a, and an included angle between the line connecting the lower side of the first end of the curved channel 120 and the end of the extending end of the lower sidewall 142 of the diversion chamber 140 and the second side of the fire grate 10 is also called an included angle β between the line segment a and the line segment B.

This causes a first vortex D to be formed at the curved passage 120, and the first vortex D improves the uniformity of mixing of air and gas in the curved passage 120, thereby ensuring the uniformity of combustion speed and height among the groups of flame holes. This also causes a second vortex E to be formed in the flow dividing chamber 140, and the second vortex E is used for inhibiting the air flow at the first group of flame holes and the second group of flame holes on the rear side of the fire grate 10 from being too fast, and reducing the flame speed of the first group of flame holes and the second group of flame holes. When the complete machine works, the surface temperature of the back plate of the water heater 1 can be reduced, and damage is reduced.

According to a second aspect of the present invention, there is also provided a burner 20, the burner 20 comprising a fire grate 10 for a burner 20 as defined in any one of the above. Since the burner 20 includes the fire grate 10 as described in any one of the above embodiments, the burner 20 has the technical effects of any one of the fire grate 10, and thus the detailed description thereof is omitted.

According to the third aspect of the present invention, the present invention further provides a water heater 1, wherein the water heater 1 comprises the above burner 20. Since the water heater 1 includes the burner 20, the water heater 1 has the technical effects of the burner 20, and therefore, detailed description thereof is omitted.

In the description of the present embodiment, 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", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the invention.

The terms "first", "second" and "first" 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 defined as "first" or "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, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise. When a feature "comprises or comprises" a or some of its intended features, this indicates that other features are not excluded and that other features may be further included, unless expressly stated otherwise.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," "coupled," and the like are to be construed broadly and encompass, for example, both fixed and removable connection or integration; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. Those skilled in the art should understand the specific meaning of the above terms in the present invention according to specific situations.

Further, in the description of the present embodiment, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature therebetween. That is, in the description of the present embodiment, the first feature being "on," "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature "under," "beneath," or "beneath" a second feature may be directly under or obliquely under the first feature, or simply mean that the first feature is at a lesser elevation than the second feature.

Unless otherwise defined, all terms (including technical and scientific terms) used in the description of the present 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 embodiments, reference to the description of "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" or the like 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 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.

Thus, 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 in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.

Claims (10)

1. A fire grate for a burner comprising:

the main flame hole part is in a long strip shape, the length of the main flame hole part is along the length direction of the fire grate, and at least one group of main flame holes are formed;

the combustion channel is used for enabling the main flame hole part to be arranged at the top of the combustion channel, two side walls of the combustion channel are respectively arranged at two sides of the main flame hole part along the width direction of the main flame hole part and extend downwards from the main flame hole part, two side walls of the combustion channel are respectively provided with a flame stabilizing hole part and a shielding part matched with the main flame hole part, and the shielding part is located above the flame stabilizing hole part so that partial airflow in the combustion channel can flow out from the flame stabilizing hole part.

2. The fire bank for burners according to claim 1,

and the size of the shielding part along the fire grate height direction is greater than or equal to 2 mm.

3. The fire bank for a burner of claim 1,

the distance between the shielding part and the flame stabilizing hole part is larger than 1 mm.

4. The fire bank for a burner of claim 1,

the two side walls of the combustion channel are respectively recessed inwards to form the shielding part, and the depth of the inward recessed shielding part accounts for 9-14% of the size of the main flame hole along the width direction of the main flame hole part.

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

the multiple groups of main flame holes are arranged at intervals along the length direction of the fire grate;

the flame stabilizing hole parts are a plurality of flame stabilizing holes which are respectively arranged on two side walls of the combustion channel, and each flame stabilizing hole is arranged in one-to-one correspondence with each group of main flame holes;

and each flame stabilizing hole is matched with each group of main flame holes along the length of the fire grate.

6. The fire bank for a burner of claim 5, wherein,

the area of each of the flame stabilizing holes accounts for 25 to 35 percent of the area of each group of the main flame holes.

7. The fire bank for a burner of claim 6, wherein,

the area of each flame stabilizing hole accounts for 30% of the area of each group of main flame holes.

8. The fire bank for a burner of claim 1, further comprising:

the upper end of the second gradually-widening channel is communicated with the lower end of the combustion channel and is contracted and extended downwards from the lower end of the combustion channel, the upper ends of two side walls of the second gradually-widening channel are respectively arranged on the lower ends of two side walls of the combustion channel, and the included angle of the planes of the two side walls is smaller than 90 degrees;

the upper end of the connecting channel is communicated with the lower end of the second gradually-widening channel and extends downwards from the lower end of the second gradually-widening channel, the upper ends of two side walls of the connecting channel are respectively connected with the lower ends of two side walls of the second gradually-widening channel, and the included angle of the surfaces of the two side walls is 90 degrees;

the upper end of the first gradually-widening channel is communicated with the lower end of the connecting channel and extends downwards from the lower end of the connecting channel in a shrinkage mode, the upper ends of the two side walls of the first gradually-widening channel are respectively communicated with the lower ends of the two side walls of the connecting channel, and the included angle of the surfaces of the two side walls is 90 degrees.

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.

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