CN218672169U - 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, fire row is including drawing penetrating passageway, crooked passageway and shunting chamber. The injection passage has a fire grate inlet formed at a first side of the fire grate for being disposed opposite to the gas supply port. The injection channel extends along the leading-in direction of the fuel gas leading-in fire discharge inlet. The first end of the bent passage is communicated with the downstream end of the injection passage, and the second end of the bent passage is bent towards the first side of the fire grate. The flow dividing chamber is communicated with the bent channel, and the upper side of the flow dividing chamber extends towards the flame holes of the fire grate. The flow dividing chamber comprises a pressing part, the pressing part is arranged close to the bent channel, and the pressing part is used for enabling the interval of the flow dividing chamber at the pressing part to be reduced. The pressure part is used for reducing the interval of the flow dividing chamber at the position of the pressure part so as to adjust the air flow speed of the flame hole at the position.

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. In general, a water heater introduces gas into a fire grate through an injection passage, a bent passage, a flow dividing passage and the like. At present, the requirements of different flame holes of the fire grate on the air flow speed are different, and how to adjust the air flow speed at the flame holes at specific positions of the fire grate is called as a problem to be solved urgently.

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 injection channel is provided with a fire grate inlet formed on the first side of the fire grate and used for being arranged opposite to the gas supply port, and the injection channel extends along the introduction direction of the gas introduction fire grate inlet;

the first end of the bent channel is communicated with the downstream end of the injection channel, and the second end of the bent channel is bent towards the first side of the fire grate;

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

and the pressing part is arranged close to the bent channel and used for reducing the interval of the flow dividing chamber at the pressing part.

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

Optionally, the depth of the inward recess of the pressing portion accounts for a range of a pitch of both sidewalls of the diverging chamber from 5% to 15%.

Optionally, the pressure portion extends from the communication portion towards the flame hole of the flame bank.

Optionally, the shape of the pressing portion and the communication portion are both circular arcs, the communication portion is disposed along the outer peripheral wall of the curved channel, and the pressing portion is disposed along the length direction of the communication portion.

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

Optionally, a first end of the communication portion in a length direction thereof is proximate to a first side of the tortuous path, the first end of the communication portion being downstream of an apex of the tortuous path.

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 grate, the second side of the fire grate being opposite to the first side of the fire grate;

the included angle between the lower side wall of the shunting chamber and the second side of the fire grate is larger than the included angle between the connecting line of the lower side of the first end of the bent channel and the tail end of the extending end of the lower side wall of the shunting chamber and the second side of the fire grate.

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, fire row is including drawing penetrating passageway, crooked passageway and shunting chamber. The injection passage has a fire grate inlet formed at a first side of the fire grate for being disposed opposite to the gas supply port. The injection channel extends along the leading-in direction of the fuel gas leading-in fire discharge inlet. The first end of the curved passage is communicated with the downstream end of the injection passage, and the second end of the curved passage is bent towards the first side of the fire grate. The flow dividing chamber is communicated with the bent channel, and the upper side of the flow dividing chamber extends towards the flame holes of the fire grate. The flow dividing chamber comprises a pressing part which is arranged close to the bent channel and used for enabling the interval of the flow dividing chamber at the pressing part to be reduced so as to adjust the air flow speed of the flame holes at the position and meet the air flow speed of different flame holes of the flame row.

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 illustration of a fire grate from another perspective according to an embodiment of the present 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 diagram 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 simulation diagram of a fire grate without a pressure portion according to an 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 part 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 fastening two fire grate segments having a specific shape, and the two fire grate segments having a specific shape are fastened so that the fire grate 10 forms the diverging part 100, the burning part 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 piece is not limited specifically, and the fire row piece can be buckled to form the injection passage 110, the bent passage 120, the flow dividing passage 130, the combustion passage 240 and the like. 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 injection passage 110 has a fire discharge inlet 114 formed at a first side of the fire discharge 10 to be opposite to the gas supply port, and extends in an introduction direction of the gas introduction fire discharge inlet 114. A first end of the curved passage 120 communicates with a downstream end of the injection passage 110, and a second end of the curved passage 120 is curved toward a first side of the fire grate 10. The diverging chamber 140 communicates with the curved path 120, the upper side of which extends toward the flame holes of the fire grate 10, and the diverging chamber 140 includes the pressing part 141. The pressing part 141 is disposed adjacent to the curved passage 120 for making the interval of the diverting chamber 140 at the pressing part 141 small.

As shown in fig. 8, the fan and the gas pipeline are located below the water heater 1 in parallel, that is, the fan is located at the lower left side of the water heater 1, and the gas pipeline is located at the lower right side of the water heater 1. The gas pipe has a gas supply port, and the gas pipe passage gas supply port supplies gas into the fire grate 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 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.

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 the extending direction thereof, that is, both ends of the curved channel 120 in the flow direction thereof. 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.

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 dividing 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 grate 10 has a plurality of groups of flame holes, and the plurality of groups of 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 row 10 to the front side of the fire row 10, the plurality of groups of flame holes are sequentially called 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. The number of the flame holes 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. 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.

The diverting chamber 140 includes a pressing portion 141, the pressing portion 141 is disposed near the curved passage 120, and the spacing of the diverting chamber 140 at the pressing portion 141 becomes smaller. As shown in fig. 9 and 10, the pressure part 141 reduces the size of the second vortex 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, the damage is reduced, and the heights of the third group of flame holes and the fourth group of flame holes are adjusted simultaneously so as to meet the requirements of the flame rows 10 on the air flow speeds of different flame holes.

In other embodiments, the curved channel 120 has an elongated communicating portion through which the diverting chamber 140 communicates with the curved channel 120, both side walls of the diverting chamber 140 are provided on both sides of the communicating portion in the width direction thereof, and both side walls of the diverting 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 example, the communicating portion is a first long slit section having an elongated shape and provided on the curved passage 120. Both side walls of the diversion chamber 140 are provided on both sides of the communicating portion in the width direction thereof, that is, both side walls of the diversion chamber 140 are provided on both sides of the first long slit section in the width direction thereof.

Both side walls of the diverting 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 diverging flow 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 meanwhile, 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 grate 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 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, 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 channel along its length is adjacent a first side of the tortuous path 120, the first end of the channel being downstream of the apex 121 of the tortuous path. That is, 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.

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 makes crooked passageway 120 department form first vortex D, and first vortex D makes the homogeneity of gas and air mixture higher, guarantees the homogeneity and the combustion stability of each flame hole, improves the high technical problem of gas concentration of the rear side flame hole of traditional fire row 10.

In other embodiments, the lower sidewall 142 of the diverter chamber 140 extends from the first end of the communication portion toward the second side of the fire bank 10, which is opposite the first 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 the 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.

In other embodiments, the apex 121 of the curved passage is spaced from a second side of the fire bank 10 opposite the first side of the fire bank 10 by a distance along the direction of introduction that is greater than 10% of the total distance of the fire bank 10 along the direction of introduction.

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 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 may be in the range of 20% to 50% of the total distance of the fire row 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 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 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 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 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 tortuous channel 120 and the diversion channel 130 have long slits that extend from the tortuous channel 120 toward the second end of the diversion channel 130; 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.

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.

The long slits serve to communicate the curved passages 120 and the branch passages 130 with the flame holes of the fire row 10, and have a width that increases along the extending 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 FIGS. 1 and 3, the beginning of the long seam 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 meandering channel. 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 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.

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.

Wherein the converging channel section 111 extends in the direction of introduction of the gas introduction fire exit 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 outlet port 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, has increased the injection coefficient that the gas jetted the 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 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 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 bank 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 bank 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 shape in cross-section perpendicular to the direction of introduction. 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.

In other embodiments, the flow dividing portion 100 has a fire discharge port 114 disposed opposite to the gas supply port, and the top of the flow dividing portion 100 has an elongated communication structure, the length of the communication structure being along the introduction direction of the gas into the fire discharge port 114;

the lower extreme and the communicating structure of first gradually widening passageway 210 are connected in order to communicate with reposition of redundant personnel portion 100 to upwards gradually widen the extension from the communicating structure, the both sides wall 211 of first gradually widening passageway sets up respectively in the both sides of communicating structure along its width direction, the contained angle of the both sides wall 211 place face of first gradually widening passageway is less than 90.

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

In this embodiment, the specific shape of the communicating structure is not limited, and can be selected as needed. As a specific example, the communicating structure is divided into the second long slit segment 131 on the diverging passage 130 and the slit 143 on the diverging chamber 140 along the length direction thereof. The communicating structure comprises a second long slit segment 131 on the diversion channel 130 and a slit 143 on the diversion chamber 140, wherein the second long slit segment 131 on the diversion channel 130 and the slit 143 on the diversion chamber 140 are arranged in sequence from front to back.

As shown in fig. 5, the lower end of the first gradually-widening passage 210 is connected with a communicating structure. The two sidewalls 211 of the first gradually widening channel are disposed on two sides of the communicating 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 flow of the mixture of gas and air through the communication structure to the first gradually widening passage 210 is from a small size to a large size. As shown in fig. 12, if the included angle between the surfaces of the two sidewalls 211 of the first gradually widening channel is too large, the mixed gas generates a long vortex in the left and right spaces under the action of the pressure field, which results in the left and right swaying of the mixed gas flow and the flame.

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 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 prevents the mixture from generating a vortex in the left and right spaces when the mixture flows toward the first gradually widening passage 210 through the communicating structure, as shown in fig. 13. The problem of air flow left-right swing and flame left-right swing of the mixed gas is solved, and the flame is stable to burn.

In other embodiments, the fire grate 10 further includes a connection passage 220, a lower end of the connection passage 220 communicating with an upper end of the first gradually-widening passage 210 and extending upward from the upper end of the first gradually-widening passage 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. This solves the air flow side-to-side and flame side-to-side problems of the mixture, as shown in fig. 13, making the combustion of the flame relatively stable and the mixing of the gas and air relatively uniform.

In other embodiments, the fire grate 10 further includes a second gradually widening passage 230, a lower end of the second gradually widening passage 230 communicating with an upper end of the connection passage 220 and gradually widening upward from the upper end of the connection 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 flows from the connecting channel 220 to the second gradually widening channel 230 from small size to large size, as shown in fig. 12, if the included angle between the surfaces of the two side walls 231 of the second gradually widening channel is too large, the mixture generates a long vortex in the left and right space under the action of the pressure field, which causes the mixture flow and the flame to swing left and right.

The included angle of the surfaces of the two side walls 231 of the second gradually widening channel is smaller than 90 degrees, and at this time, the included angle of the surfaces of the two side walls 231 of the second gradually widening channel is 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 angles between the two sidewalls 211 of the first gradually widening channel are smaller than the angles 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.

As shown in fig. 13, the mixture flows from the first gradually widening passage 210 to the second gradually widening passage 230, which prevents the mixture from generating a vortex in the left and right spaces under the effect of the pressure field. The problem of air flow left-right swing and flame left-right swing of the mixed gas is solved, and the flame is stable to burn.

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

The main flame hole part 250 is arranged at the top of the combustion channel 240, and the main flame hole part 250 is provided with a plurality of groups of main flame holes 251 arranged at intervals along the leading-in direction; each of the flame stabilizing holes 243 is adapted to the size of each set of the main flame holes 251 in the introduction direction.

As shown in fig. 12, in the upward flow of the mixture, the mixture tends to swirl on the left and right sides, which results in the flame swaying left and right. Two side walls 241 of the combustion channel are also the left and right side walls of the combustion channel 240, a plurality of flame stabilizing holes 243 are opened on the left and right side walls of the combustion channel 240, and gas generating 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 the primary flame hole 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, the area of each of the plurality of flame stabilizing holes 243 may occupy 25% to 35% of the area of each of the plurality of main flame holes 251. As shown in fig. 13, the speed of the air flow at the flame stabilizing hole 243 is matched with the speed of the air flow at the main flame hole 251, so as to solve the technical problem of the left-right swinging of the flame holes and be beneficial to ensuring the stability of combustion.

In other embodiments, the area of each of the plurality of flame stabilizing holes 243 is in a range of 25% to 35% of the area of each of the plurality of main flame holes 251. 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, 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, resulting in a more stable flame burning.

In other embodiments, the area of each of the plurality of flame stabilizing holes 243 is 30% of the area of each of the plurality of main flame holes 251. 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, 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, resulting in a more stable flame burning.

In other embodiments, the two sidewalls 241 of the combustion channel respectively have shielding parts 242 corresponding to the main flame holes 251, wherein the shielding parts 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 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 holes 251. As a specific example, as shown in fig. 4, the shielding portion 242 is formed by inwardly recessing fire extinguishing sheets, and specifically, the fire extinguishing sheets are inwardly punched to form the shielding portion 242. The shielding part 242 is fitted to the main flame holes 251, that is, the size of the shielding part 242 in the length direction of the fire row 10 is identical to the size of the main flame holes 251 in the length direction.

The shielding portion 242 is used to smoothly divert the mixture. The mixture gas generating the vortex passes through the flame stabilizing holes 243, enters the auxiliary passage, and reaches the auxiliary flame holes through the auxiliary passage. 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 row 10, i.e., the blanking to form the flame stabilizing hole portions and the stamping to form the shielding portions 242.

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.

According to a second aspect of the present invention, there is also provided a burner 20, the burner 20 comprising a fire row 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 a third aspect of the present invention, the present invention further provides a water heater 1, wherein the water heater 1 comprises the above-mentioned 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 embodiments, 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," and the like are used in the orientation or positional relationship indicated in the drawings for convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present 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," and "coupled" and the like are to be construed broadly and can, for example, be fixedly connected or detachably connected or integral to one another; 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", "above" and "over" the second feature includes the first feature being directly above and obliquely above the second feature, or merely 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 the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," 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 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 injection passage is provided with a fire grate inlet formed on the first side of the fire grate and used for being arranged opposite to the gas supply port, and the injection passage extends along the introduction direction of the gas into the fire grate inlet;

the first end of the bent channel is communicated with the downstream end of the injection channel, and the second end of the bent channel is bent towards the first side of the fire grate;

a flow distribution chamber communicating with the curved passage and having an upper side extending toward flame holes of the fire grate, comprising:

and the pressing part is arranged close to the bent channel and used for reducing the interval of the flow dividing chamber at the pressing part.

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

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

3. The fire bank 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 shunting chamber.

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

the pressing portion extends from the communicating portion toward the flame hole of the flame bank.

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

the connecting portion is arranged along the outer peripheral wall of the curved channel, and the pressing portion is arranged along the length direction of the connecting portion.

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

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

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

a first end of the communication portion along a length direction thereof is proximate to a first side of the tortuous path, the first end of the communication portion being located downstream of a vertex of the tortuous path.

8. The fire bank for burners according to claim 7,

the lower side wall of the diversion chamber extends from the first end of the communication part to a second side of the fire grate, and the second side of the fire grate is opposite to the first side of the fire grate;

the included angle between the lower side wall of the flow dividing chamber and the second side of the fire grate is larger than the included angle between the connecting line of the lower side of the first end of the bent channel and the tail end of the extending end of the lower side wall of the flow dividing chamber and the second side of the fire grate.

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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