Burners and gas water heaters

Abstract

The present application belongs to the technical field of water heaters, and specifically relates to a burner and a gas water heater. The present application aims to solve the problem of inadequate combustion of the fire grate of the existing burner. The burner of the gas water heater of the present application includes a fire grate and a combustion rack, and the fire grate includes a first shell, a second shell and a third shell, and an air mixing channel and a secondary air intake branch are provided in the first shell; a secondary air outlet branch is formed between the second shell and the first shell, and the secondary air outlet branch is connected with the secondary air intake branch to form a secondary air channel; an auxiliary air flow channel is formed between the third shell and the first shell, and a main air flow channel is formed in the third shell, and the main air flow channel is connected with the auxiliary air flow channel and the air mixing channel respectively; the combustion rack is provided with an air mixing hole and a secondary air hole, and the air mixing hole is connected with the air mixing channel, and the secondary air hole is connected with the secondary air intake branch, so as to provide secondary air for combustion, improve the sufficiency of combustion, and thus improve the combustion effect.

Description

Technical Field

[0001] The present application belongs to the technical field of water heaters, and specifically relates to a burner and a gas water heater. Background Art

[0002] A gas water heater is a gas appliance that uses gas as fuel and burns a mixture of air and gas in a combustion chamber through a burner to produce high-temperature flue gas. The high-temperature flue gas flows through a heat exchanger and exchanges heat with cold water in the heat exchanger to prepare hot water. It is widely used because of its convenience in use and fast hot water production.

[0003] In the related art, the fire row of the burner is provided with an injection channel, and air and gas are mixed in the injection channel and then ejected from the flame holes to burn and form a flame.

[0004] However, not only is the amount of air insufficient and the mixing uneven, which often results in incomplete combustion, producing more CO and NOx and other gases that are very harmful to the human body, but also affects the heating efficiency. Summary of the invention

[0005] In order to solve the above-mentioned problems in the prior art, that is, to solve the problem that the fire grate of the existing burner burns insufficiently and affects the heating efficiency, the present application provides a burner and a gas water heater.

[0006] The burner includes: a combustion rack and a fire grate, and the fire grate includes: a first shell, a second shell and a third shell; an air mixing channel and a secondary air intake branch are provided in the first shell, and the secondary air intake branch and part of the air mixing channel are located on the inner side of the second shell; the second shell is located on the outer side of part of the first shell, and a secondary air outlet branch is formed between the second shell and the first shell, and the secondary air outlet branch is connected with the secondary air intake branch to form a secondary air channel; the third shell is located in the first shell, and an auxiliary air flow channel is formed between the third shell and the first shell, and a main air flow channel is formed in the third shell, and the main air flow channel is connected with the auxiliary air flow channel and the air mixing channel respectively; the combustion rack is provided with an air mixing hole and a secondary air hole, and the air mixing hole is connected with the air mixing channel, and the secondary air hole is connected with the secondary air intake branch.

[0007] In an optional technical solution of the above-mentioned burner, the third shell includes a top flat plate and two third side plates spaced apart on the bottom surface of the top flat plate, the top flat plate is provided with a main flame hole, and the space between the top flat plate and the two third side plates forms the main airflow channel; the bottom end openings of the two third side plates are connected to the mixing channel, and the third side plate is provided with a first through hole connecting the main airflow channel and the auxiliary airflow channel.

[0008] In an optional technical solution of the above-mentioned burner, a plurality of the main flame holes are arranged on the top flat plate, and the plurality of the main flame holes are evenly spaced along the length direction of the top flat plate to form a combustion unit; a plurality of the combustion units are spaced along the length direction of the top flat plate; each of the combustion units corresponds to one of the first through holes, or each of the main flame holes of each of the combustion units corresponds to one of the first through holes.

[0009] In the optional technical solution of the above-mentioned burner, the two third side panels protrude toward the main airflow channel respectively to form reinforcing bosses respectively; the bottom ends of the two third side panels protrude toward the main airflow channel respectively to form connecting bosses respectively, and a first connecting strip is connected between the two connecting bosses.

[0010] In an optional technical solution of the above-mentioned burner, the first shell includes two opposite first side panels, partial areas of the two first side panels are connected, and partial areas of the two first side panels are spaced to form the mixing channel and the secondary air intake channel; partial areas of the two first side panels protrude toward the third side panel to form a first welding boss, and the first welding boss is a long strip extending along the length direction of the top flat plate, and the first welding boss is welded to the third side panel; the auxiliary airflow channel is formed between the first side panel above the first welding boss and the third side panel, and the first through hole is provided on the third side panel above the first welding boss.

[0011] In an optional technical solution of the above-mentioned burner, the second shell includes two opposite second side panels and a second connecting strip connected to the top ends of the two second side panels, and a gap is provided between part of the second side panels and the first side panel to form the secondary air outlet channel; a part of the second side panel protrudes toward the first side panel to form a first abutment boss and a second abutment boss, and the first abutment boss abuts the first side panel at the upper and lower ends of the first welding boss; the second abutment boss is located below the first abutment boss, and the second abutment boss abuts the first side panel forming the gas mixing channel.

[0012] In an optional technical solution of the above-mentioned burner, the air intake port of the secondary air intake channel is flush with the air intake port of the mixing channel; the side wall of the secondary air intake channel at one end away from its air intake port is recessed inward to form an air passage plate portion, and a second through hole is provided on the air passage plate portion, and the second through hole connects the secondary air outlet channel with the secondary air intake channel.

[0013] In an optional technical solution of the above-mentioned burner, the first shell has a first side and a second side relative to each other, and the second side of the first shell is provided with a snap-fitting opening for snapping into the combustion frame; the first side of the second shell is fixedly connected to the first side of the first shell to form a first connecting portion, and the bottom surface of the first connecting portion forms a contact plane for abutting against the combustion frame.

[0014] In an optional technical solution of the above-mentioned burner, the gas outlet port of the main airflow channel is flush with the gas outlet port of the auxiliary airflow channel; and the top end surface of the second shell protrudes from the gas outlet port of the main airflow channel.

[0015] The gas water heater comprises: a water tank, a fan and the above-mentioned burner, the water tank is installed at the top end of the burner, the fan is installed at the bottom end of the burner, and the air outlet of the fan is connected to the air inlet of the burner.

[0016] Those skilled in the art can understand that, in the burner and the gas water heater of the present application, the burner comprises a fire grate and a combustion rack, the fire grate comprises a first shell, a second shell and a third shell, an air mixing channel and a secondary air intake channel are arranged in the first shell, the second shell is located on the outside of a portion of the first shell, and a secondary air outlet channel is formed between the second shell and the first shell, and the secondary air outlet channel is connected with the secondary air intake channel to form a secondary air channel; the third shell is located in the first shell, and an auxiliary air flow channel is formed between the third shell and the first shell, a main air flow channel is formed in the third shell, and the main air flow channel is connected with the auxiliary air flow channel and the air mixing channel respectively; the combustion rack is provided with an air mixing hole and a secondary air hole, the air mixing hole is connected with the air mixing channel, and the secondary air hole is connected with the secondary air intake channel.

[0017] In this way, the mixed gas enters the mixed gas channel of the fire grate through the mixed gas holes of the burner rack, part of the mixed gas in the mixed gas channel flows out through the main gas flow channel to burn and form the main flame, and the other part of the mixed gas in the mixed gas channel flows out through the auxiliary gas flow channel to burn and form the auxiliary flame; the secondary air enters the secondary air channel through the secondary air holes of the burner rack and is discharged, providing secondary air for the combustion of the main flame and the auxiliary flame, improving the sufficiency of combustion, and thus improving the combustion effect. Moreover, the secondary air is located outside the auxiliary flame, which can also play the effect of gathering the flame. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred embodiments of the burner and the gas water heater of the present application are described below with reference to the accompanying drawings. The accompanying drawings are:

[0019] Figure 1 is a schematic diagram of the structure of a burner provided in an embodiment of the present application;

[0020] Figure 2 is an exploded view of a burner provided in an embodiment of the present application;

[0021] Figure 3 It is a schematic diagram of the structure of the fire bar provided in the embodiment of the present application;

[0022] Figure 4 is an exploded view of the fire bar provided in the embodiment of the present application;

[0023] Figure 5 This is a front view of the fire grate provided in the embodiment of the present application;

[0024] Figure 6 yes Figure 5 AA section view in;

[0025] Figure 7 yes Figure 5 BB section view in;

[0026] Figure 8 is a schematic structural diagram of a first shell of a fire bar provided in an embodiment of the present application;

[0027] Fig. 9 It is a schematic diagram of the structure of the third shell of the fire bar provided in an embodiment of the present application.

[0028] In the attached figure:

[0029] 1000: fire bar; 100: first shell; 110: air mixing channel; 111: first section; 112: second section; 113: third section; 114: fourth section; 115: fifth section; 120: secondary air intake channel; 121: air plate; 1211: second through hole; 130: first side plate; 131: first welding boss; 140: snap-fit ​​opening; 150: first connecting portion; 151: abutting plane; 160: welding area; 200: second shell; 201: secondary air outlet channel; 210: second side plate; 211: first abutting boss; 212: second abutting boss; 213: blocking Partition convex strip; 220: second connecting strip; 300: third shell; 301: main air flow channel; 302: auxiliary air flow channel; 310: third side plate; 311: first through hole; 312: reinforcing boss; 313: connecting boss; 320: top plate; 321: main flame hole; 322: combustion unit; 330: first connecting strip; 331: extension part; 332: horizontal part; 410: combustion frame; 411: mixing hole; 412: secondary air hole; 420: combustion chamber shell; 421: air inlet; 430: air adjustment plate; 431: first air adjustment hole; 432: second air adjustment hole; 433: third air adjustment hole. DETAILED DESCRIPTION

[0030] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0031] Secondly, it should be noted that in the description of the embodiments of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0032] In addition, it should be noted that in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0033] In the related art, the fire grate of the burner is provided with an injection channel, and the air and gas are mixed in the injection channel and then ejected from the flame hole to burn to form a flame. However, not only is the air volume insufficient and the mixing is uneven, the combustion is often incomplete, and more CO and NOx, which are very harmful to the human body, are produced, and the heating efficiency is affected.

[0034] In view of this, an embodiment of the present application provides a medium burner, in which a gas mixing channel and a secondary air channel are integrated in the fire grate, and a gas mixing hole and a secondary air hole are also provided on the combustion frame. The gas mixing hole is connected with the gas mixing channel to provide primary air and fuel gas; the secondary air hole is connected with the secondary air channel to provide secondary air for combustion, thereby improving the completeness of combustion and helping to improve the combustion effect.

[0035] The preferred technical solutions of the burner and gas water heater of the present application are described below in conjunction with the accompanying drawings.

[0036] Figure 1 is a schematic diagram of the structure of a burner provided in an embodiment of the present application; Figure 2 It is an exploded view of the burner provided in the embodiment of the present application.

[0037] Reference Figure 1 and Figure 2 The embodiment of the present application provides a burner, which includes: a combustion rack 410 and a fire bar 1000, and the fire bar 1000 is installed on the combustion rack 410. There are multiple fire bars 1000, and the multiple fire bars 1000 are arranged at intervals along the Y-axis direction. Figure 1 and Figure 2 Only one fire bar 1000 is shown in the figure. Actually, the number of the fire bars 1000 is the same as the number of the gas mixing holes 411 provided on the combustion rack 410 .

[0038] Figure 3 It is a schematic diagram of the structure of the fire bar provided in the embodiment of the present application; Figure 4 is an exploded view of the fire bar provided in the embodiment of the present application; Figure 5 This is a front view of the fire grate provided in the embodiment of the present application; Figure 6 yes Figure 5 AA section view in; Figure 7 yes Figure 5 BB section view in;

[0039] Figure 8 is a schematic structural diagram of a first shell of a fire bar provided in an embodiment of the present application; Fig. 9 It is a schematic diagram of the structure of the third shell of the fire bar provided in an embodiment of the present application.

[0040] Combination Figures 3 to 7 The fire bar 1000 of the embodiment of the present application includes: a first shell 100 , a second shell 200 and a third shell 300 .

[0041] The first housing 100 is provided with a gas mixing passage 110 and a secondary air intake branch passage 120, and the secondary air intake branch passage 120 and part of the gas mixing passage 110 are located inside the second housing 200, that is, part of the first housing 100 is located inside the second housing 200. In the embodiment of the present application, the upper half of the first housing 100 is located inside the second housing 200.

[0042] The second shell 200 is located outside a portion of the first shell 100, and a secondary air outlet passage 201 is formed between the second shell 200 and the first shell 100. A portion of the second shell 200 is connected to the first shell 100, and a portion of the second shell 200 is spaced from the first shell 100 to form a secondary air outlet passage 201. The secondary air outlet passage 201 is connected to the secondary air intake passage 120 to form a secondary air channel to provide secondary air for combustion.

[0043] The third shell 300 is located in the first shell 100, and an auxiliary airflow channel 302 is formed between the third shell 300 and the first shell 100. A main airflow channel 301 is formed in the third shell 300, and the main airflow channel 301 is connected to the auxiliary airflow channel 302 and the gas mixing channel 110 respectively, so that a mixed gas of primary air and fuel gas enters the main airflow channel 301 through the gas mixing channel 110 and burns to form a main flame; part of the mixed gas enters the auxiliary airflow channel 302 and burns to form an auxiliary flame.

[0044] It can be understood that there are two auxiliary air flow channels 302, which are located on both sides of the main air flow channel 301, which can play a role in gathering the main flame; there are also two secondary air outlet channels 201, which are located on the outside of the auxiliary air flow channel 302, to provide secondary air for combustion, and to prevent the auxiliary flame from diverging, thereby playing a role in gathering the flame.

[0045] Recombination Figure 1 and Figure 2 The combustion frame 410 is provided with a mixing hole 411 and a secondary air hole 412. The mixing hole 411 is connected with the mixing channel 110 to input the mixed gas into the mixing channel 110; the secondary air hole 412 is connected with the secondary air intake channel 120 to input the secondary air into the secondary air outlet channel 201.

[0046] The combustion rack 410 can evenly distribute the mixed gas entering each fire bar 1000 by providing the gas mixing holes 411 , and can evenly distribute the secondary air entering each fire bar 1000 by providing the secondary air holes 412 , thereby improving the uniformity of combustion between each fire bar 1000 .

[0047] In order to further improve the uniformity of combustion, the burner of the embodiment of the present application further includes an air regulating plate 430, which is fixed on the combustion frame 410, and the air regulating plate 430 is in contact with the side plate of the combustion frame 410 where the mixing hole 411 and the secondary air hole 412 are arranged. In addition, the air regulating plate 430 is provided with a second air regulating hole 432 directly opposite to the mixing hole 411, a third air regulating hole 433 directly opposite to the secondary air hole 412, and a first air regulating hole 431 located below the second air regulating hole 432. Among them, the first air regulating hole 431, the second air regulating hole 432 and the third air regulating hole 433 are all rectangular holes. The embodiment of the present application achieves uniformity of the airflow between the uniform fire bars 1000 by setting the air regulating plate 430.

[0048] The burner of the embodiment of the present application further includes a combustion chamber housing 420, which is located outside the combustion frame 410 and the air regulating plate 430 to form a combustion space. The combustion chamber housing 420 is provided with an air inlet 421, which is connected to the air outlet of the fan of the gas water heater.

[0049] In the embodiment of the present application, the opening directions of the air mixing hole 411 and the secondary air hole 412 are the same. The opening direction of the air inlet 421 is different from the opening direction of the air mixing hole 411, so that the air entering from the air inlet 421 passes through a section of the channel and enters the air mixing hole 411 and the secondary air hole 412, which can prevent the air from the air inlet 421 from directly blowing toward the air mixing hole 411 and the secondary air hole 412, thereby affecting the uniformity of combustion.

[0050] like Figure 1 and Figure 2As shown, the opening direction of the mixing hole 411 and the secondary air hole 412 is the negative direction of the X axis, and the opening direction of the air inlet 421 is along the positive direction of the Z axis. At this time, a first cavity is formed between the bottom of the combustion frame 410 and the bottom of the combustion chamber shell 420, and a second cavity is formed by a gap between the air regulating plate 430 and the combustion chamber shell 420, so that the air from the air inlet 421 enters the first cavity, and enters the second cavity after the initial uniform air flow through the first air regulating hole 431; then part of the air enters the mixing channel 110 after the uniform air flow again through the second air regulating hole 432, and part of the air enters the secondary air intake channel 120 after the uniform air flow again through the third air regulating hole 433.

[0051] The embodiment of the present application performs double regulation of the air by setting a first air regulating hole 431, a second air regulating hole 432 and a third air regulating hole 433 on the air regulating plate 430, thereby improving the uniformity of the air entering each fire row 1000, thereby improving the uniformity of combustion.

[0052] Reference Fig. 9 The third shell 300 of the embodiment of the present application includes a top flat plate 320 and two third side plates 310 spaced apart on the bottom surface of the top flat plate 320. The top flat plate 320 is provided with a main flame hole 321, and the space between the top flat plate 320 and the two third side plates 310 forms a main air flow channel 301. The left and right ends of the two third side plates 310 are fixedly connected and closed, and the bottom openings of the two third side plates 310 are connected to the gas mixing channel 110, so that the mixed gas in the gas mixing channel 110 enters the main air flow channel 301, and part of the mixed gas in the main air flow channel 301 is discharged and burned in the main flame hole 321 to form a main flame.

[0053] The third side plate 310 is provided with a first through hole 311 connecting the main air flow channel 301 and the auxiliary air flow channel 302, so that another part of the mixed gas in the main air flow channel 301 enters the auxiliary air flow channel 302 through the first through hole 311, and the mixed gas in the auxiliary air flow channel 302 burns at the outlet port of the auxiliary air flow channel 302 to form an auxiliary flame.

[0054] Combination Figure 6 and Figure 7 The outlet port of the main air flow channel 301, that is, the port of the main flame hole 321, is flush with the outlet port of the auxiliary air flow channel 302, so that the main flame and the auxiliary flame burn on the same plane, improving the combustion effect.

[0055] Continue to refer to Fig. 9The top plate 320 is a long strip extending in the X direction so as to form a plurality of combustion units 322 to increase the combustion area. Specifically, a plurality of main flame holes 321 are arranged on the top plate 320, and the plurality of main flame holes 321 are arranged at intervals along the length direction of the top plate 320 to form a combustion unit 322. A plurality of combustion units 322 are arranged at intervals along the length direction of the top plate 320, and each combustion unit 322 may include three or five main flame holes 321, etc. The embodiment of the present application does not limit the number of combustion units 322 and the number of main flame holes 321 of each combustion unit 322.

[0056] The intervals between two adjacent main flame holes 321 in the same combustion unit 322 are the same, and the intervals between two adjacent combustion units 322 are the same, which can improve the uniformity of the flame. The interval between two adjacent combustion units 322 is greater than the interval between two adjacent main flame holes 321 in the same combustion unit 322. The combustion unit 322 formed in this way can make the flame burn in a concentrated manner, form multiple flames, and improve the stability of combustion. The main flame hole 3211 can be a circular hole, an elliptical hole, a waist-shaped hole, etc. Optionally, the main flame hole 321 is a long strip hole extending in the Y-axis direction.

[0057] In some embodiments, each combustion unit 322 corresponds to a first via hole 311. Fig. 9 At this time, the first via holes 311 are long strip holes extending along the X direction, the first via holes 311 are evenly spaced along the X axis direction, and the number of the first via holes 311 is the same as the number of the combustion units 322. Such a setting facilitates the processing of the first via holes 311.

[0058] In other embodiments, each main flame hole 321 of each combustion unit 322 corresponds to a first through hole 311, and the first through hole 311 can be a circular hole, an elliptical hole, a polygonal hole, etc. The number of the first through holes 311 is the same as the number of the main flame holes 321, and the first through holes 311 correspond to the main flame holes 321 one by one. In this way, the mixed gas can be further evenly distributed when passing through the first through holes 311, further improving the uniformity of combustion.

[0059] In the embodiment of the present application, by making each combustion unit 322 correspond to a first through hole 311, or each main flame hole 321 of each combustion unit 322 corresponds to a first through hole 311, the mixed gas between each combustion unit 322 can be made uniform, thereby improving the uniformity of combustion between each combustion unit 322.

[0060] The two third side panels 310 protrude toward the main air flow channel 312, respectively, to form reinforcing bosses 312, and the reinforcing bosses 312 may be in the shape of a strip, a circle, an ellipse, etc., which is not limited here. For example, the reinforcing boss 312 is a circular boss. A plurality of reinforcing bosses 312 may be provided, which are arranged at intervals on the third side panel 310. Exemplarily, two reinforcing bosses 312 are provided on each third side panel 310. The embodiment of the present application does not limit the number and arrangement of the reinforcing bosses 312. The embodiment of the present application improves the structural strength of the third side panel 310 by providing the reinforcing bosses 312 on the third side panel 310, thereby preventing the third side panel 310 from deforming and causing the cross-sections of the main air flow channel 301 and the auxiliary air flow channel 302 to be affected, thereby affecting the uniformity of combustion.

[0061] The bottom ends of the two third side panels 310 protrude toward the main airflow channel 301, respectively, forming connecting bosses 313, and the first connecting strip 330 is connected between the two connecting bosses 313. Such a configuration can ensure the spacing between the bottom ends of the two third side panels 310, thereby ensuring the size of the air inlet of the main airflow channel 301, and avoiding deformation of the air inlet of the main airflow channel 301 and affecting the uniformity of the mixed gas. Moreover, the connecting boss 313 can also play a role in strengthening the third side panel 310. In the embodiment of the present application, by setting the connecting boss 313, the surface of the third side panel 310 facing the first shell 100 is a pit, providing an installation space for the first connecting strip 330, and such a configuration can avoid the first connecting strip 330 from protruding.

[0062] The first connecting strip 330 may be a straight strip parallel to the top plate 320, and connected to the connecting bosses 313 of the two third side plates 310 respectively. Alternatively, the first connecting strip 330 includes an extension portion 331 and a horizontal portion 332, wherein the extension portion 331 is perpendicular to the horizontal portion 332, and two extension portions 331 are provided, and are respectively located at both ends of the horizontal portion 332. The extension portion 331 may be welded to the connecting boss 313. The horizontal portion 332 is parallel to the top plate 320, and is used to ensure the distance between the two third side plates 310. The first connecting strip 330 is arranged in this way for easy installation.

[0063] Combination Figure 4 , Figure 6 , Figure 7 as well as Figure 8The first housing 100 includes two opposite first side panels 130, and parts of the two first side panels 130 are connected, and parts of the two first side panels 130 are spaced to form a gas mixing channel 110 and a secondary air intake channel 120. The right sides and bottom ends of the two first side panels 130 are connected, such as by welding, hemming, etc. Partial areas of the left sides of the two first side panels 130 are connected, and parts of the areas form an intake port of the gas mixing channel 110 and an intake port of the secondary air intake channel 120. The top ends of the two first side panels 130 are spaced to form a port for flame combustion.

[0064] Optionally, the air intake port of the mixing channel 110 is flush with the air intake port of the secondary air intake channel 120, which can improve the uniformity of air entering the mixing channel 110 and the secondary air intake channel 120 and improve the convenience of connecting the fire grate 1000 with the mixing holes 411 and the secondary air holes 412 on the combustion rack 410.

[0065] The first housing 100 has a first side and a second side opposite to each other. Figure 8 Left and right sides of the direction shown in . Combine Figure 1 and Figure 2 The second side of the first shell 100 is provided with a snap-fitting opening 140 which is snap-fitted with the combustion rack 410 , and the top end of the second side of the first shell 100 is snap-fitted with the combustion rack 410 , so that the second side of the fire bar 1000 is fixed on the combustion rack 410 .

[0066] Reference Figure 3 The first side of the second shell 200 is fixedly connected to the first side of the first shell 100 to form a first connecting portion 150. The bottom surface of the first connecting portion 150 forms an abutting plane 151 abutting against the combustion rack 410, and the top end of the first connecting portion 150 is snap-fitted with the combustion rack 410, so that the first side of the fire bar 1000 is fixed on the combustion rack 410.

[0067] Thus, the fire bar 1000 is stably mounted on the combustion rack 410, and the mounting method is simple and reliable.

[0068] Reference Figure 6 and Figure 7 Partial areas of the two first side plates 130 protrude toward the third side plate 310 to form a first welding boss 131. The first welding boss 131 is a long strip extending along the length direction of the top flat plate 320. The first welding boss 131 is welded to the third side plate 310 to achieve a fixed connection between the third shell 300 and the first shell 100.

[0069] An auxiliary airflow channel 302 is formed between the first side plate 130 and the third side plate 310 above the first welding boss 131 . A first via hole 311 is provided on the third side plate 310 above the first welding boss 131 . That is, the first via hole 311 is located above the first welding boss 131 .

[0070] Continue to refer to Figure 6 and Figure 8 , one end of the secondary air intake channel 120 away from its intake port is recessed inward to form an air plate portion 121, and a second through hole 1211 is provided on the air plate portion 121. The left end of the secondary air intake channel 120 is its intake port, and the side wall of the right end of the secondary air intake channel 120 is recessed inward to form an air plate portion 121, and the air plate portion 121 is provided on both sides of the secondary air intake channel 120. The air plate portion 121 is a flat plate portion, which is convenient for processing the second through hole 1211. The second through hole 1211 is used to connect the secondary air intake channel 120 and the secondary air outlet channel 201. One second through hole 1211 can be provided, and multiple second through holes 1211 can also be provided, for example, two. The shape of the second through hole 1211 can be arbitrary, for example, the second through hole 1211 is a waist-shaped hole. The embodiment of the present application does not limit the shape, number and arrangement of the second through holes 1211.

[0071] The embodiment of the present application facilitates the arrangement of the second through hole 1211 by arranging the air plate portion 121, and the air plate portion 121 also makes the cross-sectional area of ​​the right end of the secondary air intake channel 120 smaller than the cross-sectional area of ​​the left end thereof, which is beneficial to increase the flow rate of the secondary air, so that the secondary air quickly enters the secondary air outlet channel 201. The cross-sectional area of ​​the secondary air intake channel 120 is a plane formed by cutting the YZ plane.

[0072] Combination Figures 5 to 8 , the gas mixing channel 110 of the embodiment of the present application includes a first section 111, a second section 112, a third section 113, a fourth section 114 and a fifth section 115 that are connected. Among them, the left end of the first section 111 is the air intake port of the gas mixing channel 110, and the first section 111 extends along the X-axis direction. The left end of the first section 111 is connected to the second section 112, and the first section 111 and the second section 112 are tangent, so that the mixed gas flows more smoothly. The third section 113 is connected to the second section 112, and the third section 113 is roughly triangular, and the cross-sectional area of ​​the third section 113 gradually decreases from left to right. The shapes of the first section 111, the second section 112 and the third section 113 are roughly U-shaped channels that open to the left. Furthermore, the secondary air intake channel 120 is located in the U-shaped channel, and the first side plate 130 between the secondary air intake channel 120 and the U-shaped channel is contact-welded, which facilitates welding of the second shell 200 and the first side plate 130 and is conducive to forming the secondary air outlet channel 201.

[0073] The fourth section 114 is connected to the third section 113 and extends along the X-axis direction, so that the mixed gas can enter the main air flow channel 301 along the X-axis direction. The fifth section 115 is connected to the fourth section 114 and extends along the X-axis direction. The fifth section 115 is located above the fourth section 114.

[0074] The distance between the two first side plates 130 on both sides of the first section 111, that is, the dimension of the first section 111 along the Y direction, is defined as a first interval; the distance between the two first side plates 130 on both sides of the second section 112, that is, the dimension of the second section 112 along the Y direction, is defined as a second interval; the distance between the two first side plates 130 on both sides of the third section 113, that is, the dimension of the third section 113 along the Y direction, is defined as a third interval; the distance between the two first side plates 130 on both sides of the fourth section 114, that is, the dimension of the fourth section 114 along the Y direction, is defined as a fourth interval; the distance between the two first side plates 130 on both sides of the fifth section 115, that is, the dimension of the fifth section 115 along the Y direction, is defined as a fifth interval.

[0075] Among them, the second interval is smaller than the first interval, so that the welding area of ​​the second shell 200 is formed on the side wall of the second section 112; the third interval is smaller than the second interval, so that there is an interval between the first side plate 130 forming the third section 113 and the second shell 200, which is convenient for forming the secondary air outlet channel 201. The fourth interval is smaller than the third interval, so that the cross-sectional area of ​​the fourth section 114 is smaller than the cross-sectional area of ​​the third section 113, so that the flow rate and pressure of the mixed gas flow here change, so that the mixed gas becomes more uniform along the X direction after passing through the fourth section 114, so that the mixed gas can be evenly burned along the X direction. The fifth interval is larger than the fourth interval, so that the bottom end of the third shell 300 can be avoided to avoid interference; and it can also make the mixed gas flow enter the main air flow channel 301 in large quantities, improving the smoothness of the mixed gas flow.

[0076] The first side plate 130 , which forms part of the secondary air intake passage 120 , part of the air mixing passage 110 and the auxiliary air flow passage 302 , is spaced apart from the second housing 200 to form a secondary air outlet passage 201 .

[0077] Specific combination Figures 6 to 8 The second housing 200 is welded to the first side plate 130 via the welding area 160. The welding area 160 includes Figure 8The six dotted elliptical areas in the figure should be understood as the dotted elliptical areas are only approximate limits on the position and range of the welding area 160, and cannot be understood as limits on the specific position and range of the welding area 160 in the embodiment of the present application. The second shell 200 is welded to the area of ​​the first connecting portion 150 on the left side of the first shell 100, the first partial area on the left end of the secondary air intake channel 120, the second partial area between the first partial area and the area of ​​the first connecting portion 150, the third partial area at the lower part of the secondary air intake channel 120, the partial area of ​​the second section 112, and the fourth partial area on the right side of the first shell 100, so that the second shell 200 is fixedly connected to the first shell 100; the bottom end of the second shell 200 is open to match the top port of the first shell 100 to form an outlet port of the secondary air outlet channel 201.

[0078] Therefore, other partial areas of the U-shaped channel and partial areas of the third section 113 and above are separated from the second shell 200 to form a secondary air outlet channel 201. When the secondary air passes through the channel corresponding to the fourth section 114, the channel of this section extends along the X-axis direction, so that the secondary air can be distributed to each combustion unit 322 along the X-axis direction. In addition, the cross-sectional area of ​​the secondary air outlet channel 201 changes at the corresponding part of the fifth section 115, the corresponding part of the first welding boss 131, and the corresponding part of the upper area of ​​the first welding boss 131, so that the flow rate and pressure of the secondary air change, so that the secondary air becomes more uniform in the X-axis direction, which is conducive to improving the uniformity of combustion.

[0079] It should be noted that the cross-sections of each section of the air mixing channel 110 and each section of the secondary air outlet channel 201 refer to the cross-sections formed by cutting along the YZ plane.

[0080] Reference Figure 3 and Figure 4 The second housing 200 of the embodiment of the present application includes two opposite second side panels 210 and second connecting strips 220 connected to the top ends of the two second side panels 210. The second connecting strips 220 are respectively connected to the top ends of the second side panels 210 on both sides. Such an arrangement can ensure the distance between the two second side panels 210 and avoid affecting the size of the outlet port of the secondary air outlet channel 201. Optionally, a plurality of second connecting strips 220 are provided, and the plurality of second connecting strips 220 are evenly spaced along the X-axis direction, so as to further improve the structural strength and stability of the top end port of the second side panel 210.

[0081] Combination Figures 5 to 7Part of the second side plate 210 protrudes toward the first housing 100 to form a first abutting boss 211 and a second abutting boss 212. The first abutting boss 211 abuts against the first side plate 130 at the upper and lower ends of the first welding boss 131. In other words, the first abutting boss 211 abuts against the outer side of the fifth section 115 of the gas mixing channel 110, and the first abutting boss 211 abuts against the first side plate 130 at the upper part of the first welding boss 131. The second abutting boss 212 is located below the first abutting boss 211. The second abutting boss 212 abuts against the first side plate 130 forming the gas mixing channel 110. Specifically, the second abutting boss 212 abuts against the third section 113 of the gas mixing channel 110.

[0082] The first abutting boss 211 may be a long strip boss extending along the Z-axis direction. A plurality of first abutting bosses 211 may be provided, and the plurality of first abutting bosses 211 are arranged at intervals along the X-axis direction. Figures 3 to 5 , wherein a blocking ridge 213 is disposed between two adjacent first abutting bosses 211, and there is a gap between the blocking ridge 213 and the first side plate 130. The blocking ridge 213 provided in the embodiment of the present application blocks the airflow to prevent excessive airflow. The shape, number and arrangement of the first abutting bosses 211 are not limited to those shown in the figure.

[0083] The second abutting boss 212 may be semicircular, elliptical, polygonal, etc. The embodiment of the present application does not limit the shape, number, and arrangement of the second abutting boss 212 .

[0084] In the embodiment of the present application, a first abutment boss 211 and a second abutment boss 212 are arranged on the second side plate 210 so that a distance is maintained between the second side plate 210 and the first side plate 130, that is, the size of the secondary air outlet channel 201 is ensured, and the first abutment boss 211 and the second abutment boss 212 can also play a role in blocking the airflow, which is beneficial to ensure the uniformity of the secondary air outlet.

[0085] Optionally, the top end surface of the second side plate 210 of the second shell 200 protrudes from the air outlet port of the main air flow channel 301, so that the secondary air can be restricted, so that the main flame moves toward the middle, and the gathering effect of the flame combustion is improved.

[0086] An embodiment of the present application also provides a gas water heater, which includes: a water tank, a fan and the burner of the above embodiment, the water tank is installed at the top of the burner, the fan is installed at the bottom of the burner, and the air outlet of the fan is connected to the air inlet of the burner. The fan provides air for the burner to burn, and the high-temperature flue gas generated by the combustion of the fire grate of the burner exchanges heat with the water tank, thereby heating the water in the water tank.

[0087] In summary, the gas water heater provided in the embodiment of the present application has a burner including a combustion rack 410 and a fire grate 1000, and the fire grate 1000 includes: a first shell 100, a second shell 200 and a third shell 300; a gas mixing channel 110 and a secondary air intake channel 120 are provided in the first shell 100, the second shell 200 is located outside a part of the first shell 100, and a secondary air outlet channel 201 is formed between the second shell 200 and the first shell 100, and the secondary air outlet channel 201 is connected with the secondary air intake channel 120 to form a secondary air channel to provide secondary air for combustion. The third shell 300 is located in the first shell 100, and an auxiliary air flow channel 302 is formed between the third shell 300 and the first shell 100, and a main air flow channel 301 is formed in the third shell 300.

[0088] The combustion frame 410 is provided with a gas mixing hole 411 and a secondary air hole 412. The gas mixing hole 411 is connected to the gas mixing channel 110. The mixed gas of the primary air and the fuel gas enters the gas mixing channel 110 through the gas mixing hole 411. Part of the mixed gas enters the main air flow channel 301 and burns to form a main flame; part of the mixed gas enters the auxiliary air flow channel 302 and burns to form an auxiliary flame. The secondary air hole 412 is connected to the secondary air inlet channel 120 to input secondary air to the secondary air outlet channel 201, provide secondary air for combustion, and improve the sufficiency of combustion.

[0089] The secondary air passage of the embodiment of the present application is arranged in the fire bar 1000, which can reduce the interval between the fire bars and make the burner structure more compact. In addition, the mixing holes 411 and the secondary air holes 412 are arranged in the combustion frame 410, which is conducive to improving the uniformity of the airflow between different fire bars 1000 and improving the combustion effect.

[0090] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A burner, characterized in that: include: A combustion rack and a fire grate, wherein the fire grate comprises: a first shell, a second shell and a third shell; An air mixing passage and a secondary air intake branch passage are provided in the first shell, and the secondary air intake branch passage and a part of the air mixing passage are located on the inner side of the second shell; The second shell is located outside a portion of the first shell, and a secondary air outlet passage is formed between the second shell and the first shell, and the secondary air outlet passage is connected with the secondary air inlet passage to form a secondary air channel; The third shell is located inside the first shell, and an auxiliary airflow channel is formed between the third shell and the first shell, and a main airflow channel is formed inside the third shell, and the main airflow channel is communicated with the auxiliary airflow channel and the gas mixing channel respectively; two auxiliary airflow channels are provided, which are respectively located on both sides of the main airflow channel; the air outlet port of the main airflow channel is flush with the air outlet port of the auxiliary airflow channel; the top end surface of the second shell protrudes from the air outlet port of the main airflow channel; The combustion frame is provided with a gas mixing hole and a secondary air hole, the gas mixing hole is communicated with the gas mixing channel, and the secondary air hole is communicated with the secondary air intake branch channel.

2. The burner according to claim 1, characterized in that The third shell includes a top flat plate and two third side plates spaced apart on the bottom surface of the top flat plate, the top flat plate is provided with a main flame hole, and the space between the top flat plate and the two third side plates forms the main air flow channel; the bottom end openings of the two third side plates are connected to the mixing channel, and the third side plate is provided with a first through hole connecting the main air flow channel and the auxiliary air flow channel.

3. The burner according to claim 2, characterized in that: The top plate is provided with a plurality of main flame holes, and the plurality of main flame holes are evenly spaced along the length direction of the top plate to form a combustion unit; the plurality of combustion units are spaced along the length direction of the top plate; Each of the combustion units corresponds to one of the first through holes, or each of the main flame holes of each of the combustion units corresponds to one of the first through holes.

4. The burner according to claim 2, characterized in that: The two third side plates protrude toward the main air flow channel respectively to form reinforcing bosses; The bottom ends of the two third side plates protrude toward the main air flow channel respectively to form connecting bosses, and a first connecting strip is connected between the two connecting bosses.

5. The burner according to claim 2, characterized in that: The first housing includes two opposite first side plates, parts of the two first side plates are connected, and parts of the two first side plates are spaced apart to form the air mixing channel and the secondary air intake channel; Partial areas of the two first side plates protrude toward the third side plate to form a first welding boss, the first welding boss is in the shape of a long strip extending along the length direction of the top flat plate, and the first welding boss is welded to the third side plate; The auxiliary air flow channel is formed between the first side plate and the third side plate above the first welding boss, and the first via hole is disposed on the third side plate above the first welding boss.

6. The burner according to claim 5, characterized in that The second shell includes two opposite second side panels and a second connecting strip connected to the top ends of the two second side panels, and a gap is formed between part of the second side panels and the first side panels to form the secondary air outlet passage; A partial area of ​​the second side plate protrudes toward the first side plate to form a first abutment boss and a second abutment boss, and the first abutment boss abuts the first side plate at the upper and lower ends of the first welding boss; the second abutment boss is located below the first abutment boss, and the second abutment boss abuts the first side plate forming the gas mixing channel.

7. The burner according to any one of claims 1 to 6, characterized in that: The air intake port of the secondary air intake channel is flush with the air intake port of the mixing channel; the side wall of the secondary air intake channel at one end away from its air intake port is recessed inward to form an air passage plate portion, and a second through hole is provided on the air passage plate portion, and the second through hole connects the secondary air outlet channel and the secondary air intake channel.

8. The burner according to any one of claims 1 to 6, characterized in that: The first shell has a first side and a second side opposite to each other, and the second side of the first shell is provided with a snap-fitting opening for snapping with the combustion frame; The first side of the second shell is fixedly connected to the first side of the first shell to form a first connecting portion, and the bottom surface of the first connecting portion forms an abutting plane abutting against the combustion frame.

9. A gas water heater, characterized in that: include: A water box, a fan and a burner as described in any one of claims 1 to 8, wherein the water box is installed at the top of the burner, the fan is installed at the bottom of the burner, and the air outlet of the fan is connected to the air inlet of the burner.

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