Flow guide, burner and water heater

Abstract

The application discloses a flow guide device, a burner and a water heater, and relates to the technical field of water heaters. The flow guide device is used for the burner, the burner has a plurality of fire rows, and the flow guide device comprises: a wind collecting hood provided with an air inlet and a wind collecting cavity communicated with the air inlet; and a flow guide piece arranged on the wind collecting hood and used for being arranged opposite to fire row inlets of the plurality of fire rows. The flow guide piece is provided with a plurality of gas jet holes and a plurality of flow guide grooves. The gas jet holes are used for being communicated with the fire row inlets one by one. The flow guide grooves are arranged one by one corresponding to the gas jet holes. The air inlet ends of each flow guide groove are respectively communicated with the wind collecting cavity. The air outlet ends of each flow guide groove are provided with air jet holes. Each flow guide groove jets air through the air jet holes to the corresponding gas jet hole and / or fire row inlet. The technical scheme provided by the application can realize accurate control of the amount of input gas and air of each fire row, ensure the combustion sufficiency and combustion consistency of each fire row, and reduce the emission of CO in flue gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water heaters, in particular to a flow guide device, a burner and a water heater. BACKGROUND

[0002] In the related art, the multiple fire rows of the atmospheric burner often have inconsistent ejecting air amounts, which causes the equivalence ratios of different fire rows to be inconsistent, and further causes the combustion conditions of each fire row to be inconsistent, thereby reducing the uniformity and consistency of the combustion of the burner, and ultimately resulting in poor combustion performance and emission performance of the entire gas water heater. Due to insufficient air content of the fire row, the gas cannot be fully and effectively combusted, resulting in excessive carbon monoxide (CO) content in the flue gas. SUMMARY

[0003] The main purpose of the present application is to provide a flow guide device, a burner and a water heater, which can accurately control the amounts of gas and air input to each fire row, ensure the combustion sufficiency and combustion consistency of each fire row, and reduce the emission of CO in the flue gas.

[0004] To achieve the above-mentioned purpose, the flow guide device provided by the present application is used in a burner, the burner has multiple fire rows, and the flow guide device comprises:

[0005] a wind collecting cover provided with an air inlet and a wind collecting cavity in communication with the air inlet; and

[0006] a flow guide member provided in the wind collecting cover and arranged opposite to fire row inlets of the multiple fire rows, the flow guide member is provided with multiple gas jet holes and multiple flow guide grooves, the gas jet holes are used to communicate with the fire row inlets one by one, the flow guide grooves are arranged one by one corresponding to the gas jet holes, the air inlet ends of each flow guide groove are in communication with the wind collecting cavity respectively, the air outlet ends of each flow guide groove are provided with air jet holes, and each flow guide groove jets air to the corresponding gas jet hole and / or fire row inlet through the air jet hole.

[0007] In an embodiment, in the direction from the inlet end to the outlet end of the gas jet hole, the central axis of the air jet hole is arranged obliquely towards the side close to the central axis of the gas jet hole.

[0008] In an embodiment, an included angle a is formed between the jet direction of the air jet hole and the jet direction of the gas jet hole, the included angle a is not less than 20° and not more than 70°.

[0009] In an embodiment, the air jet hole at the air outlet end of each flow guide groove comprises a first jet hole, the first jet hole penetrates the inner peripheral wall of the corresponding gas jet hole to jet air to the corresponding gas jet hole.

[0010] And / or, the air jet hole of the exhaust end of each of the flow guide slots comprises a second jet hole, the second jet hole penetrating through the flow guide towards the side of the gas jet hole corresponding to the fire bed inlet to jet air to the corresponding fire bed inlet.

[0011] In an embodiment, the exhaust end of each of the flow guide slots is provided with a plurality of first jet holes, the plurality of first jet holes are arranged at intervals to form a first jet ring, the first jet ring is arranged around the inner peripheral wall of the corresponding gas jet hole.

[0012] And / or, the exhaust end of each of the flow guide slots is provided with a plurality of second jet holes, the plurality of second jet holes are arranged at intervals to form a second jet ring, the second jet ring is arranged around the periphery of the corresponding gas jet hole.

[0013] In an embodiment, the exhaust end of each of the flow guide slots is provided with a plurality of first jet holes and a plurality of second jet holes, the plurality of first jet holes are arranged at intervals along the circumference of the corresponding gas jet hole to form the first jet ring, the plurality of second jet holes are arranged at intervals along the circumference of the gas jet hole to form the second jet ring, the first jet ring and the second jet ring are coaxially arranged.

[0014] In an embodiment, in the direction from the inlet end to the outlet end of the gas jet hole, the jet directions of the plurality of first jet holes of the same first jet ring converge towards the center position of the side away from the inlet end of the gas jet hole.

[0015] And / or, in the direction from the inlet end to the outlet end of the gas jet hole, the jet directions of the plurality of first jet holes of the same first jet ring converge towards the center position of the side away from the inlet end of the gas jet hole.

[0016] In an embodiment, in the first jet ring and the second jet ring corresponding to the same gas jet hole, the first jet holes and the second jet holes are arranged staggered in the circumference of the corresponding gas jet hole.

[0017] In an embodiment, the flow guide comprises a housing and a plurality of partition plates arranged in the housing, the plurality of partition plates are arranged at intervals in a first direction to divide the inner cavity of the housing into a plurality of flow guide slots arranged at intervals in the first direction; each of the flow guide slots is provided with a flow guide cylinder extending in a second direction, the two ends of each of the flow guide cylinders penetrate through the opposite sides of the housing respectively, the inner peripheral wall of each of the flow guide cylinders forms the gas jet hole, the cylinder wall of the flow guide cylinder and / or the side wall of the housing is provided with the air jet hole, the first direction intersects the second direction.

[0018] In an embodiment, the wind collecting cover comprises a wind distribution plate, the flow guide is arranged on one side of the wind distribution plate, and the outer side of the wind distribution plate and the outer side of the flow guide jointly define a containing space for containing a plurality of the fire rows, and the wind distribution plate is provided with a plurality of air outlet holes for communicating the air collecting cavity with the containing space.

[0019] In an embodiment, the plurality of gas jet holes are arranged in a first direction, the plurality of air outlet holes comprise a plurality of air outlet hole groups arranged in the first direction, each of the air outlet hole groups comprises a plurality of air outlet holes arranged in a second direction, and the first direction intersects the second direction; in the first direction, the air outlet area of the air outlet holes of the outermost air outlet hole group is smaller than the air outlet area of the air outlet holes of the air outlet hole groups at the middle part.

[0020] The present application also provides a burner comprising:

[0021] a plurality of fire rows, each of the fire rows having a fire row inlet; and

[0022] The flow guide device as described above, the plurality of gas jet holes of the flow guide device one-to-one communicate with the fire row inlets of the plurality of fire rows, and the plurality of flow guide grooves of the flow guide device jet air through the air jet holes to the corresponding gas jet holes and / or the fire row inlets.

[0023] The present application also provides a water heater comprising the burner as described above.

[0024] The technical scheme of the present application comprises a flow guide device including a wind collecting cover and a flow guide, the wind collecting cover is provided with an air inlet and an air collecting cavity communicating with the air inlet; the flow guide is arranged opposite to the fire row inlets of a plurality of fire rows, and the flow guide is provided with a plurality of gas jet holes and a plurality of flow guide grooves. The plurality of gas jet holes can be used to jet gas one-to-one to the fire row inlets of the plurality of fire rows, so as to accurately control the amount of gas input to each fire row; and the air is collected in the air collecting cavity and then distributed through the plurality of flow guide grooves, and the air is jetted to the corresponding gas jet holes and / or fire row inlets through the air jet holes at the exhaust ends of the flow guide grooves, so as to accurately guide the air in the air collecting cavity to the inside of the corresponding fire row, accurately control the amount of air input to each fire row, and ensure that each fire row can input sufficient amount of air, so as to make the gas burn sufficiently and effectively, and reduce the emission of CO in flue gas. The technical scheme of the present application can accurately control the amount of gas and air input to each fire row, ensure the sufficiency and consistency of combustion of each fire row, and reduce the emission of CO in flue gas. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from the structures shown in the drawings without creative labor.

[0026] Figure 1 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure.

[0027] Figure 2 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure. Figure 1 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure.

[0028] Figure 3 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure. Figure 1 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure.

[0029] Figure 4 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure. Figure 3 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure.

[0030] Figure 5 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure. Figure 1 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure.

[0031] Figure 6 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure. Figure 1 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure.

[0032] Figure 7 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure. Figure 6 The structural schematic diagram of an embodiment of the flow guiding device provided by the present application is shown in the figure.

[0033] Figure 8 The figure is the cloud diagram of the turbulence intensity of the fire row inlet section of a traditional burner (without flow guiding device).

[0034] Figure 9 The figure is the cloud diagram of the turbulence intensity of the fire row inlet section of a burner provided by an embodiment of the present application (with flow guiding device).

[0035] Figure 10 The figure is the velocity vector diagram of the fire row inlet section of a traditional burner (without flow guiding device).

[0036] Figure 11 The figure is the velocity vector diagram of the fire row inlet section of a burner provided by an embodiment of the present application (with flow guiding device).

[0037] Explanation of the figure reference:

[0038] 100, flow guide device; 10, wind collecting cover; 101, air inlet; 102, wind collecting cavity; 103, accommodating space; 11, air distribution plate; 111, air outlet hole; 111a, air outlet hole group; 20, flow guide piece; 201, gas jet hole; 202, flow guide groove; 203, air jet hole; 2031, first jet hole; 2031a, first jet ring; 2032, second jet hole; 2032a, second jet ring; 21, shell; 211, positioning part; 22, partition plate; 23, flow guide cylinder.

[0039] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0041] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0042] In addition, if the embodiments of the present application involve descriptions of “first”, “second” and the like, the descriptions of “first”, “second” and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, “and / or” or “and / or” appearing throughout the text means that the three parallel schemes are included, for example, “A and / or B” includes A scheme, or B scheme, or A and B are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0043] In the related art, the multiple fire rows of the atmospheric burner often have inconsistent amounts of extracted air, which causes the equivalence ratios of different fire rows to be inconsistent, and further causes the combustion conditions of each fire row to be inconsistent, thereby reducing the uniformity and consistency of the combustion of the burner, and ultimately resulting in poor overall combustion performance and emission performance of the gas water heater. Due to insufficient extraction of air by the fire row, the gas cannot be fully and effectively combusted, resulting in excessive carbon monoxide (CO) content in the flue gas.

[0044] The present application provides a flow guide device 100 for a burner, which can precisely control the air input amount of each fire row by cooperating with the multiple fire rows of the burner, and ensure the combustion sufficiency and consistency of each fire row.

[0045] Please refer to Figures 1 to 6 In an embodiment of the present application, the flow guide device 100 is used for a burner, the burner has multiple fire rows, and the flow guide device 100 includes a wind collecting cover 10 and a flow guide member 20. The wind collecting cover 10 is provided with an air inlet 101 and a wind collecting cavity 102 communicating with the air inlet 101. The flow guide member 20 is arranged in the wind collecting cover 10 and is arranged opposite to the fire row inlets of the multiple fire rows. The flow guide member 20 is provided with multiple gas jet holes 201 and multiple flow guide grooves 202. The gas jet holes 201 are used to communicate with the fire row inlets one by one. The flow guide grooves 202 are arranged one by one corresponding to the gas jet holes 201. The air inlet ends of each flow guide groove 202 respectively communicate with the wind collecting cavity 102. The air outlet ends of each flow guide groove 202 are provided with air jet holes 203. Each flow guide groove 202 jets air to the corresponding gas jet hole 201 and / or fire row inlet through the air jet hole 203.

[0046] The flow guide device 100 is used to guide the gas and air into the multiple fire rows of the burner, so as to provide sufficient gas and air for each fire row.

[0047] The burner has multiple fire rows arranged along a first direction. Each fire row has a fire row inlet, a combustion port, and an airflow channel communicating the fire row inlet with the combustion port. The gas and air can be introduced into the airflow channel through the fire row inlet, mixed in the airflow channel, and then transported to the combustion port for ignition and combustion, forming a combustion flame. The fire row inlets of the multiple fire rows can be arranged on the same side of the burner along a second direction, so as to correspondingly communicate with the multiple gas jet holes 201 of the flow guide device 100. The first direction intersects the second direction. For example, the first direction can be the width direction of the fire row, and the second direction can be the length direction of the fire row.

[0048] The flow guide device 100 comprises a wind collecting cover 10 and a flow guide piece 20. The wind collecting cover 10 is used for collecting air and conveying the air towards the flow guide piece 20, and the flow guide piece 20 is used for splitting the air conveyed by the wind collecting cover 10 via a plurality of flow guide grooves 202, and then jetting the air to corresponding gas jet holes 201 and / or fire grate inlets through air jet holes 203 arranged at the air outlet ends of the flow guide grooves 202.

[0049] The wind collecting cover 10 has an air inlet 101 and a wind collecting cavity 102 in communication with the air inlet 101. The air inlet 101 can be used to be in communication with the air outlet of the fan, and the air flow discharged by the fan can enter the wind collecting cavity 102 through the air inlet 101. For example, the air outlet of the fan is generally arranged as a square port, and correspondingly, the air inlet 101 is arranged as a square port matched with the shape of the air outlet of the fan, so as to be in butt joint with the air outlet of the fan and form a reliable sealing connection structure, so as to collect the air flow discharged by the fan to the maximum extent. Of course, the air inlet 101 can also be arranged as a circular port, an elliptical port or other shaped opening according to actual needs, which is not limited here. For the fan down type gas water heater, the fan is generally arranged below the burner, and correspondingly, the air inlet 101 can be arranged at the bottom of the wind collecting cover 10, and a plurality of fire grates can be arranged at the top of the wind collecting cover 10.

[0050] The flow guide piece 20 is arranged in the wind collecting cover 10. The flow guide piece 20 and the wind collecting cover 10 can be arranged in one piece or in separate pieces and then assembled. Alternatively, the flow guide piece 20 and the wind collecting cover 10 are arranged in one piece, which can simplify the manufacturing process and ensure the sealing reliability of the internal cavity. The flow guide piece 20 has a plurality of gas jet holes 201, and the plurality of gas jet holes 201 can be arranged at intervals along a first direction. Each gas jet hole 201 can be arranged along a second direction, and two ends of each gas jet hole 201 penetrate through two side walls of the flow guide piece 20 along the second direction. In this way, the plurality of gas jet holes 201 can be in one-to-one communication with the fire grate inlets of the plurality of fire grates, and the gas conveyed by the external pipeline can be jetted to the corresponding fire grates through each gas jet hole 201, so as to realize accurate control of the gas input amount of each fire grate.

[0051] The flow guide 20 is further configured with a plurality of flow guide grooves 202. The air inlet ends of the plurality of flow guide grooves 202 are respectively communicated with the air collecting cavity 102, so that the air collected by the air collecting cavity 102 can be distributed to each flow guide groove 202. The air outlet end of each flow guide groove 202 is provided with an air jet hole 203. Each flow guide groove 202 jets air to the corresponding gas jet hole 201 and / or fire grate inlet through the air jet hole 203. For example, the air jet hole 203 at the air outlet end of the flow guide groove 202 can include a first jet hole 2031 directly communicated with the corresponding gas jet hole 201. In this way, the air in the flow guide groove 202 can be jetted into the corresponding gas jet hole 201 through the first jet hole 2031, so that the air and the gas are preliminarily mixed in the gas jet hole 201 and then jetted into the corresponding fire grate inlet. For another example, the air jet hole 203 at the air outlet end of the flow guide groove 202 can include a second jet hole 2032 directly communicated with the corresponding fire grate inlet. In this way, the air in the flow guide groove 202 can be directly jetted into the corresponding fire grate inlet through the second jet hole 2032. For another example, the air jet hole 203 at the air outlet end of the flow guide groove 202 can be provided with a plurality of air jet holes, including the first jet hole 2031 and the second jet hole 2032. In this way, part of the air in the flow guide groove 202 is jetted into the corresponding gas jet hole 201 through the first jet hole 2031, preliminarily mixed with the gas, and then jetted into the corresponding fire grate inlet, and the other part of the air is directly jetted into the corresponding fire grate inlet through the second jet hole 2032.

[0052] It is worth noting that the number of air jet holes 203 at the air outlet end of each flow guide groove 202 can be one, two, three or more, which is not specifically limited here. The number of air jet holes 203 at the air outlet end of each flow guide groove 202 can be the same or different. In actual application, due to the difference in flow field wind speed at each part inside the air collecting cavity 102, the width of each flow guide groove 202 can be adjusted according to the measured flow field wind speed, so as to ensure that the amount of air flowing to the plurality of fire grates through the plurality of flow guide grooves 202 is basically consistent. That is, the widths of the plurality of flow guide grooves 202 do not require complete consistency, and can have certain differences.

[0053] The technical scheme of the present application sets the flow guide device 100 to include a wind collecting cover 10 and a flow guide piece 20. The wind collecting cover 10 is provided with an air inlet 101 and a wind collecting cavity 102 communicating with the air inlet 101. The flow guide piece 20 is arranged opposite to the fire grate inlets of the plurality of fire grates, and is provided with a plurality of gas jet holes 201 and a plurality of flow guide grooves 202. The plurality of gas jet holes 201 can be used to jet gas to the fire grate inlets of the plurality of fire grates one by one, so as to accurately control the amount of gas input to each fire grate. The air is collected by the wind collecting cavity 102 and then is divided by the plurality of flow guide grooves 202, and is jetted to the corresponding gas jet holes 201 and / or fire grate inlets through the air jet holes 203 at the exhaust end of each flow guide groove 202. In this way, the air in the wind collecting cavity 102 can be accurately guided to the inside of the corresponding fire grate, the amount of air input to each fire grate can be accurately controlled, and each fire grate can input sufficient amount of air to make the gas burn fully and effectively, thereby reducing the emission of CO in the flue gas. The technical scheme of the present application can accurately control the amount of gas and air input to each fire grate, ensure the fullness and consistency of combustion of each fire grate, and reduce the emission of CO in the flue gas.

[0054] As shown in the drawings, Figure 7 In an embodiment, in the direction from the inlet end of the gas jet hole 201 to the outlet end, the central axis of the air jet hole 203 is inclined to the side close to the central axis of the gas jet hole 201. That is, the jet direction of the gas jet hole 201 and the jet direction of the air jet hole 203 are arranged at a certain angle. In this way, the air can be jetted obliquely along the air jet hole 203 towards the gas jet hole 201 and / or the fire grate inlet, and the air and the gas can finally collide to form a head-on mixing in the gas jet hole 201 and / or the inside of the fire grate close to the fire grate inlet, which can enhance the turbulence intensity at the fire grate inlet, promote the full mixing of the gas and the air, increase the mixing degree of the gas and the air, and achieve complete premixing effect as much as possible.

[0055] It can be understood that the angle a between the jet direction of the air jet hole 203 and the jet direction of the gas jet hole 201 should not be too small or too large. If the angle a is too small, the jet direction of the air jet hole 203 and the jet direction of the gas jet hole 201 tend to be parallel, and cannot achieve good head-on mixing effect. If the angle a is too large, the jet direction of the air jet hole 203 and the jet direction of the gas jet hole 201 tend to be perpendicular, and the air jet will cause too much flow resistance to the transportation of the gas towards the fire grate inlet.

[0056] Optionally, the jet direction of the air jet orifice 203 and the jet direction of the gas jet orifice 201 form an angle α, which is not less than 20° and not greater than 70°. This ensures that the angle between the air jet direction and the gas jet direction is moderate, guaranteeing that the air and gas can mix effectively and efficiently, while also preventing excessive resistance from the air jet to the normal delivery of the gas, thus ensuring smooth flow of both gas and air towards the interior of the burner. For example, the angle α can be 20°, 30°, 40°, 50°, 60°, 70°, or any value within the range of [20°, 70°].

[0057] like Figure 3 and Figure 4 As shown, in one embodiment, the air jet hole 203 at the exhaust end of each guide groove 202 includes a first jet hole 2031, which penetrates the inner peripheral wall of the corresponding gas jet hole 201 to jet air into the corresponding gas jet hole 201; and / or, the air jet hole 203 at the exhaust end of each guide groove 202 includes a second jet hole 2032, which penetrates the guide member 20 on the side facing the burner inlet to jet air into the corresponding burner inlet.

[0058] For example, a first jet hole 2031 can be arranged at the air outlet end of each flow guide groove 202, the first jet hole 2031 penetrating the inner peripheral wall of the corresponding gas jet hole 201, that is, the first jet hole 2031 has a jet outlet located in the inner peripheral wall of the gas jet hole 201. In this way, the air in the air collector 10 is transported to the first jet hole 2031 through the flow guide groove 202, and the air jet is injected into the gas jet hole 201 through the first jet hole 2031, while the gas jet is injected into the fire grate inlet through the gas jet hole 201. In this way, the air jet from the first jet hole 2031 towards the gas jet hole 201 can enhance the fluid turbulence intensity in the gas jet hole 201, so that the air and gas can be preliminarily mixed in the gas jet hole 201, and then flow together to the corresponding fire grate inlet, and then mixed again in the fire grate. Through multiple mixing, the mixing degree of gas and air can be effectively improved, the mixing uniformity of gas and air is further improved, the combustion efficiency is improved, and the carbon monoxide emission is reduced. It should be noted that the number of first jet holes 2031 at the air outlet end of each flow guide groove 202 can be one, two, three or more. The cross-sectional shape of the first jet hole 2031 can be circular, oval, square or other special-shaped cross-section according to actual needs, which is not limited here. In addition, the first jet hole 2031 can also be arranged as an annular hole, and correspondingly, the jet outlet of the first jet hole 2031 is arranged in a ring shape and extends along the inner peripheral wall of the gas jet hole 201. In this way, the first jet hole 2031 can jet air to the gas jet hole 201 at multiple angles along the circumference of the gas jet hole 201, further enhancing the turbulence intensity in the gas jet hole 201 and further improving the mixing degree of gas and air.

[0059] For example, a second jet hole 2032 can be arranged at the air outlet end of each flow guide groove 202, the second jet hole 2032 is located outside the fuel gas jet hole 201, the second jet hole 2032 penetrates the flow guide 20 towards the side of the fire grate inlet, that is, the second jet hole 2032 has a jet outlet located on the side of the flow guide 20 towards the fire grate inlet. In this way, the air in the air collector 10 is transported to the second jet hole 2032 through the flow guide groove 202, and the air can be directly jetted into the corresponding fire grate through the second jet hole 2032, while the external fuel gas can be jetted towards the fire grate inlet through the fuel gas jet hole 201. In this way, the turbulence intensity at the fire grate inlet can be enhanced, so that the air and fuel gas are mixed at the fire grate inlet, and then transported into the fire grate to be mixed again. Through multiple mixing, the mixing degree of fuel gas and air can be effectively improved, the mixing uniformity of fuel gas and air is further improved, the combustion efficiency is improved, and the carbon monoxide emission is reduced. It should be noted that the number of second jet holes 2032 at the air outlet end of each flow guide groove 202 can be one, two, three or more. The cross-sectional shape of the second jet hole 2032 can be circular, oval, square or other special-shaped cross-section according to actual needs, which is not limited here. In addition, the second jet hole 2032 can also be arranged as an annular hole, and the jet outlet of the second jet hole 2032 is annularly arranged and surrounds the periphery of the fuel gas jet hole 201. In this way, the second jet hole 2032 can spray annular air towards the fire grate inlet to enhance the mixing degree of air and fuel gas at the fire grate inlet.

[0060] Optionally, the air jet hole 203 at the air outlet end of each flow guide groove 202 includes a first jet hole 2031 and a second jet hole 2032, the first jet hole 2031 penetrates the inner peripheral wall of the corresponding fuel gas jet hole 201 to jet air into the corresponding fuel gas jet hole 201, and the second jet hole 2032 penetrates the side of the flow guide 20 towards the fire grate inlet to jet air into the corresponding fire grate inlet. In this way, part of the air in the flow guide groove 202 is jetted into the corresponding fuel gas jet hole 201 through the first jet hole 2031 for preliminary mixing and then jetted into the corresponding fire grate inlet, and the other part of the air is directly jetted into the corresponding fire grate inlet through the second jet hole 2032. In this way, the turbulence intensity in the fuel gas jet hole 201 and at the fire grate inlet can be enhanced at the same time, and the mixed gas can generate vortexes in the fuel gas jet hole 201 and at the fire grate inlet, respectively, thereby more effectively enhancing the mixing degree of fuel gas and air, so that the mixing of fuel gas and air is more sufficient. Moreover, by jetting air through the first jet hole 2031 and the second jet hole 2032 at the same time, the amount of air input into the fire grate can be effectively improved, so that the fire grate has sufficient amount of air to achieve sufficient combustion, and the content of carbon monoxide and nitrogen oxides in the flue gas is reduced.

[0061] As Figure 4As shown, in an embodiment, the exhaust end of each flow guide groove 202 is provided with a plurality of first jet holes 2031, the plurality of first jet holes 2031 are arranged at intervals to form a first jet ring 2031a, and the first jet ring 2031a is arranged around the inner peripheral wall of the corresponding fuel gas jet hole 201; and / or, the exhaust end of each flow guide groove 202 is provided with a plurality of second jet holes 2032, the plurality of second jet holes 2032 are arranged at intervals to form a second jet ring 2032a, and the second jet ring 2032a is arranged around the outer periphery of the corresponding fuel gas jet hole 201.

[0062] For example, the exhaust end of each flow guide groove 202 can be provided with a plurality of first jet holes 2031, and the plurality of first jet holes 2031 can be arranged at intervals along the circumference of the fuel gas jet hole 201 to form a first jet ring 2031a, and the first jet ring 2031a is arranged around the inner peripheral wall of the corresponding fuel gas jet hole 201. In this way, the air transported by the flow guide groove 202 can be simultaneously jetted into the fuel gas jet hole 201 through the plurality of first jet holes 2031 on the first jet ring 2031a, so that air in multiple directions can be simultaneously mixed with the fuel gas in the fuel gas jet hole 201, further enhancing the turbulence intensity in the fuel gas jet hole 201, thereby further improving the mixing degree of the fuel gas and the air, making the mixing of the fuel gas and the air more sufficient, while also being beneficial to improve the air output per unit time of the flow guide groove 202, ensuring that the fire grate has sufficient air content, ensuring that the fire grate burns fully, and improving the flue gas emission quality. Compared with the scheme of arranging a single first jet hole 2031 in a ring shape, the present scheme arranges a plurality of discrete first jet holes 2031 to form a first jet ring 2031a, which is beneficial to reduce the flow area of a single first jet hole 2031, so that the air can be accelerated when passing through the first jet hole 2031 with a relatively small flow area, so that the first jet hole 2031 can jet air at high speed, thereby further enhancing the turbulence intensity and further improving the effect of the air and the fuel gas.

[0063] For example, a plurality of second jet holes 2032 can be arranged at the air outlet end of each flow guide groove 202, and the plurality of second jet holes 2032 can be arranged along the circumference of the fuel gas jet hole 201 to form a second jet ring 2032a surrounding the inner circumferential wall of the corresponding fuel gas jet hole 201. In this way, the air transported by the flow guide groove 202 can be simultaneously jetted towards the corresponding fire grate inlet through the plurality of second jet holes 2032 on the second jet ring 2032a, so as to enhance the mixing degree of air and fuel gas at the fire grate inlet, so that the mixing of air and fuel gas is more sufficient, and at the same time, the air output per unit time of the flow guide groove 202 is improved, so as to ensure that the fire grate has sufficient air content, ensure that the fire grate is fully burned, and improve the flue gas emission quality. Compared with the scheme of arranging a single second jet hole 2032 in a ring shape, the present scheme forms a second jet ring 2032a by surrounding a plurality of discrete second jet holes 2032, which is beneficial to reducing the flow area of a single second jet hole 2032, so that the air can be accelerated when passing through the second jet hole 2032 with a relatively small cross-sectional area, so that the second jet hole 2032 can jet air at a high speed, thereby further enhancing the turbulence intensity and further improving the mixing effect of air and fuel gas.

[0064] Optionally, the air outlet end of each flow guide groove 202 is provided with a plurality of first jet holes 2031 and a plurality of second jet holes 2032, the plurality of first jet holes 2031 are arranged along the circumference of the corresponding fuel gas jet hole 201 to form a first jet ring 2031a, the plurality of second jet holes 2032 are arranged along the circumference of the fuel gas jet hole 201 to form a second jet ring 2032a, and the first jet ring 2031a and the second jet ring 2032a are coaxially arranged. In this way, after the air in the air collector 10 is transported to the air outlet end through the flow guide groove 202, a part of the air can be simultaneously jetted into the corresponding fuel gas jet hole 201 through the plurality of first jet holes 2031 on the first jet ring 2031a, and another part of the air can be simultaneously jetted towards the corresponding fire grate inlet through the plurality of second jet holes 2032 on the second jet ring 2032a. The air is jetted out through the coaxially arranged inclined holes on the flow guide device and mixed with the fuel gas, so that strong turbulence can be generated in the fuel gas jet hole 201 and at the fire grate inlet, which can greatly improve the mixing degree of fuel gas and air, so that the mixing of air and fuel gas is more sufficient and uniform, and the complete premixing effect is achieved. In addition, the double-ring structure of the multi-hole jet can expand the contact area of fuel gas and air, promote rapid mixing, and improve the uniformity of combustion or reaction. In addition, by simultaneously jetting air through the double-ring structure, the air content in the fire grate can be more effectively ensured to be sufficient, so that the combustion of the fire grate is more sufficient, and the flue gas emission quality is improved.

[0065] For example, as shown in FIG. 6, the air collector 10 can be provided with a plurality of flow guide grooves 202, and each flow guide groove 202 can be arranged in the air collector 10 to be coaxial with the corresponding fuel gas jet hole 201. Figure 4As shown, the exhaust end of each flow guide groove 202 is provided with six first jet holes 2031 and six second jet holes 2032, the six first jet holes 2031 are arranged along the circumference of the corresponding gas jet hole 201 to form a first jet ring 2031a, and the six second jet holes 2032 are arranged along the circumference of the corresponding gas jet hole 201 to form a second jet ring 2032a. Among them, the first jet ring 2031a is arranged on the inner circumferential wall of the gas jet hole 201, and the second jet ring 2032a is arranged on the outer circumferential wall of the gas jet hole 201.

[0066] As shown in FIG. 1 and FIG. 2, in an embodiment, in the direction from the inlet end of the gas jet hole 201 to the outlet end, the jet directions of the plurality of first jet holes 2031 of the same first jet ring 2031a converge to the center position away from the inlet end of the gas jet hole 201. Figure 4 Figure 7 As shown in FIG. 1 and FIG. 2, in an embodiment, in the direction from the inlet end of the gas jet hole 201 to the outlet end, the jet directions of the plurality of first jet holes 2031 of the same first jet ring 2031a converge to the center position away from the inlet end of the gas jet hole 201.

[0067] In this embodiment, the air jetted out of the plurality of first jet holes 2031 on the first jet ring 2031a forms a conical airflow field, and the airflows jetted out of the plurality of first jet holes 2031 can converge at the center position away from the inlet end of the gas jet hole 201. In this way, it can be avoided that the converged airflows are too close to the inlet end of the gas jet hole 201, and too much resistance is generated at the inlet end of the gas jet hole 201, so as to ensure that the gas at the inlet end of the gas jet hole 201 can flow normally into the gas jet hole 201. For example, the airflows jetted out of the plurality of first jet holes 2031 can converge at the center position of the middle section of the gas jet hole 201, or can converge at the center position of the outlet end of the gas jet hole 201. In this way, a concentrated convergence area of gas and air is formed inside the gas jet hole 201 or near the outlet end of the gas jet hole 201, a stronger vortex can be generated in the convergence area, the turbulence intensity can be increased, and the chaotic flow field is more conducive to promoting the mutual collision and fusion between gas and air molecules, and accelerating the full mixing of gas and air.

[0068] Optionally, an included angle α is formed between the jet direction of each first jet hole 2031 and the jet direction of the corresponding gas jet hole 201, the included angle α is not less than 20° and not more than 70°. In this way, the included angle between the jet direction of the air and the jet direction of the gas is moderate, which can not only ensure that the air and the gas can be mixed by collision to enhance the mixing degree and achieve full mixing, but also avoid that the air jet generates too much resistance to the normal delivery of the gas, so as to ensure that the gas and the air can flow smoothly.

[0069] As shown in FIG. 1 and FIG. 2, in an embodiment, in the direction from the inlet end of the gas jet hole 201 to the outlet end, the jet directions of the plurality of first jet holes 2031 of the same first jet ring 2031a converge to the center position away from the inlet end of the gas jet hole 201. Figure 4 Figure 7 ​​As shown, in an embodiment, the jet directions of the plurality of second jet holes 2032 of the same second jet ring 2032a converge towards a central position on a side away from the inlet end of the gas jet hole 201 in a direction from the inlet end towards the outlet end of the gas jet hole 201.

[0070] In the present embodiment, the air jetted out of the plurality of second jet holes 2032 on the second jet ring 2032a forms a conical-like air flow field, and the air jetted out of the plurality of second jet holes 2032 converges at a central position on a side away from the inlet end of the gas jet hole 201 at the outlet end of the gas jet hole 201. In this way, a concentrated mixing area of gas and air can be formed at a position downstream of the outlet end of the gas jet hole 201 (i.e. near the fire grate inlet), and a strong vortex can be generated near the fire grate inlet, which can intensify the turbulence near the fire grate inlet, and the chaotic flow field is more conducive to promoting the mutual collision and fusion between gas and air molecules, and accelerating the full mixing of gas and air.

[0071] Optionally, an included angle a is formed between the jet direction of each second jet hole 2032 and the jet direction of the corresponding gas jet hole 201, and the included angle a is not less than 20° and not greater than 70°. In this way, the included angle between the air jet direction and the gas jet direction is moderate, which can ensure that the air and gas can be mixed by collision, enhance the mixing degree, achieve full mixing, while avoiding too much resistance of the air jet to the normal delivery of the gas, so as to ensure that the gas and air can flow smoothly.

[0072] Optionally, the jet directions of the plurality of first jet holes 2031 of the same first jet ring 2031a converge towards a central position on a side away from the inlet end of the gas jet hole 201 in a direction from the inlet end towards the outlet end of the gas jet hole 201; and the jet directions of the plurality of second jet holes 2032 of the same second jet ring 2032a converge at a central position on a side away from the inlet end of the gas jet hole 201 at the outlet end of the gas jet hole 201 in a direction from the inlet end towards the outlet end of the gas jet hole 201. In this way, a part of the air in the flow guide groove 202 jetted out of the plurality of first jet holes 2031 of the first jet ring 2031a can converge at a central position near the outlet end of the gas jet hole 201, and another part of the air jetted out of the plurality of second jet holes 2032 of the second jet ring 2032a can converge at a central position near the fire grate inlet. Strong vortices can be generated near the outlet end of the gas jet hole 201 and near the fire grate inlet, which can further intensify the turbulence of the flow field, and is more conducive to promoting the mutual collision and fusion between gas and air molecules, and further accelerating the full mixing of gas and air.

[0073] In order to further intensify the mixing degree of gas and air, as shown in FIG. 6, the first jet ring 2031a and the second jet ring 2032a can be arranged in a staggered manner. Figure 4As shown, in an embodiment, in the first jet ring 2031a and the second jet ring 2032a corresponding to the same gas jet hole 201, the first jet hole 2031 and the second jet hole 2032 are arranged staggered in the circumferential direction of the corresponding gas jet hole 201.

[0074] In the present embodiment, the first jet hole 2031 and the second jet hole 2032 are arranged staggered in the circumferential direction of the corresponding gas jet hole 201. That is, in the projection plane perpendicular to the central axis of the gas jet hole 201, the first jet hole 2031 is arranged corresponding to the region between the adjacent two second jet holes 2032. In this way, the gas flow emitted by the first jet hole 2031 and the gas flow emitted by the second jet hole 2032 do not interfere with each other, ensuring that the gas flow emitted by the first jet hole 2031 and the gas flow emitted by the second jet hole 2032 can both collide and merge with the gas delivered by the gas jet hole 201 towards the fire grate, so that the mixing of gas and air is more uniform. And it can form two layers of jet array that intersect each other and cover uniformly on the inside and outside of the gas jet hole 201, expand the circumferential coverage range of the jet action, and avoid the occurrence of flow "blind area". The staggered distribution of the jet can also make the inner and outer two layers of jet interact with each other in space, produce more complex turbulent structure, and be more conducive to improving the overall mixing uniformity of gas and air in the circumferential and radial directions.

[0075] As shown in the drawings, Figure 5 In an embodiment, the flow guide 20 includes a housing 21 and a plurality of partition plates 22 arranged in the housing 21, the plurality of partition plates 22 are arranged spaced apart along a first direction to divide the inner cavity of the housing 21 into a plurality of flow guide grooves 202 arranged spaced apart along the first direction; each flow guide groove 202 is provided with a flow guide cylinder 23 extending along a second direction, both ends of each flow guide cylinder 23 respectively penetrate through the opposite sides of the housing 21, and the inner circumferential wall of each flow guide cylinder 23 is arranged to form a gas jet hole 201, the cylinder wall of the flow guide cylinder 23 and / or the side wall of the housing 21 is provided with an air jet hole 203, and the first direction intersects the second direction.

[0076] In this embodiment, the housing 21 and the partition plate cooperate to construct a plurality of guide channels 202 arranged at intervals along a first direction. The housing 21 and the partition plate can be integrally formed or separately assembled. The housing 21 has a first sidewall and a second sidewall opposite to each other along a second direction. The second sidewall is positioned towards the burner inlets of the plurality of burners, and the first sidewall is located on the side of the second sidewall away from the plurality of burners. Each guide channel 202 is provided with a guide cylinder 23, which can be a circular cylinder, a square cylinder, or a cylinder of other shapes extending along the second direction. The inner peripheral wall of the guide tube 23 is provided to form a gas jet hole 201. One end of the guide tube 23 penetrates the first side wall of the housing 21 to form the inlet end of the gas jet hole 201, and the other end of the guide tube 23 penetrates the second side wall of the housing 21 to form the outlet end of the gas jet hole 201. In this way, multiple outlet ends of gas jet holes 201 arranged at intervals along the first direction can be formed on the second side wall of the housing 21 so as to communicate one-to-one with multiple burner inlets. Air jet holes 203 can be opened in the tube wall of the guide tube 23 and / or the side wall of the housing 21 so that air in the guide groove 202 can be jetted into the gas jet hole 201 through the air jet hole 203 on the tube wall of the guide tube 23, or air in the guide groove 202 can be directly jetted into the corresponding burner inlet through the air jet hole 203 on the side wall of the housing 21.

[0077] For example, the air jet orifice 203 may include a first jet orifice 2031 and a second jet orifice 2032. The first jet orifice 2031 is disposed on the cylinder wall of the guide tube 23, and the second jet orifice 2032 is disposed on the second side wall of the housing 21. In order to enable the air conveyed by the guide channel 202 to surround the cylinder wall of the guide tube 23, optionally, a gap for air passage is formed between the outer peripheral wall of the guide tube 23 and the inner wall surface of the guide channel 202. Optionally, the housing 21, the partition, and the guide tube 23 are integrally formed.

[0078] Optionally, the housing 21 is further provided with positioning parts 211 on opposite sides along the first direction, which can be positioned and assembled with the gas distribution rod of the burner.

[0079] like Figure 1 and 6 As shown, in one embodiment, the air collecting hood 10 includes an air distribution plate 11, and a flow guide 20 is disposed on one side of the air distribution plate 11. The outer side of the air distribution plate 11 and the outer side of the flow guide 20 together define a receiving space 103 for accommodating multiple fire racks. The air distribution plate 11 is provided with multiple air outlets 111 that connect the air collecting chamber 102 and the receiving space 103.

[0080] In this embodiment, the top wall of the air collecting hood 10 can form an air distribution plate 11, and the bottom wall of the air collecting hood 10 can be provided with an air inlet 101. The guide member 20 can be disposed on one side of the air distribution plate 11 along the second direction and extend relative to the air distribution plate 11 along the third direction. The guide member 20 has a plurality of gas jet holes 201 spaced apart along the first direction, and each gas jet hole 201 penetrates the guide member 20 on opposite sides along the second direction. The guide member 20 and the air distribution plate 11 together define a receiving space 103 for accommodating a plurality of burner burners. The plurality of burner burners can be arranged along the first direction, and the burner inlet of each burner faces the guide member 20 so as to communicate one-to-one with the plurality of gas jet holes 201 on the guide member 20. Furthermore, the air distribution plate 11 is provided with multiple air outlets 111, allowing air within the air collection chamber 102 to flow towards the accommodating space 103 through these outlets. This air then flows upwards through the gaps between adjacent burners, replenishing the burners with secondary air to ensure complete combustion and reduce carbon monoxide emissions in the flue gas. The first, second, and third directions are perpendicular to each other. The first direction can be the width of the burner, the second direction can be the length of the burner, and the third direction can be the height of the burner.

[0081] like Figure 1 As shown, in one embodiment, a plurality of gas jet holes 201 are arranged at intervals along a first direction, and a plurality of air outlet holes 111 include a plurality of rows of air outlet hole groups 111a arranged at intervals along the first direction. Each row of air outlet hole groups 111a includes a plurality of air outlet holes 111 arranged at intervals along a second direction. The first direction and the second direction intersect. In the first direction, the air outlet area of ​​the air outlet hole 111 in the outermost row of air outlet hole groups 111a is smaller than the air outlet area of ​​the air outlet hole 111 in the middle row of air outlet hole groups 111a.

[0082] In the embodiment, the plurality of air outlet holes 111 on the air distribution plate 11 are arranged in a matrix in the plane defined by the first direction and the second direction, and the position between two adjacent groups of air outlet hole groups 111a is just capable of accommodating one fire grate. For example, the burner has 11 rows of fire grates arranged along the first direction, and correspondingly, the air distribution plate 11 includes 12 groups of air outlet hole groups 111a arranged along the first direction at intervals, and each fire grate corresponds to the position between two adjacent air outlet hole groups 111a. In this way, the air blown by the plurality of air outlet holes 111 of the air outlet hole group 111a located in the middle position can flow upward through the gap between the two adjacent fire grates, and the air blown by the plurality of air outlet holes 111 of the air outlet hole group 111a located in the outermost row can flow upward along the wall surface of the outermost fire grate. By setting the air outlet area of the air outlet holes 111 of the air outlet hole group 111a located in the outermost row to be smaller than the air outlet area of the air outlet holes 111 of the air outlet hole group 111a located in the middle position, the amount of secondary air flowing to each fire grate can be substantially balanced to ensure the uniformity and consistency of the combustion of each fire grate.

[0083] The present application also provides a burner, which includes a plurality of fire grates and a flow guide device 100, each fire grate having a fire grate inlet; a plurality of gas jet holes 201 of the flow guide device 100 communicate with the fire grate inlets of the plurality of fire grates one by one, and a plurality of flow guide grooves 202 of the flow guide device 100 jet air to the corresponding gas jet holes 201 and / or fire grate inlets through air jet holes 203. The specific structure of the flow guide device 100 is referred to the above-mentioned embodiments. Since the present burner adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0084] In the embodiment, the plurality of fire rows can be arranged side by side along the first direction, and the flow guide device 100 includes the wind collecting hood 10 and the flow guide piece 20, the flow guide piece 20 can be arranged on one side of the wind collecting hood 10 along the second direction, and the top surface of the wind collecting hood 10 and the outer side surface of the flow guide piece 20 jointly define a containing space 103 for containing the plurality of fire rows. The wind collecting hood 10 is provided with an air inlet 101 and a wind collecting cavity 102 communicating with the air inlet 101; the flow guide piece 20 is provided with a plurality of gas jet holes 201 arranged in the first direction; and the flow guide piece 20 is internally formed with a plurality of flow guide grooves 202. The plurality of gas jet holes 201 can be used to jet gas to the fire row inlets of the plurality of fire rows one by one, so that the amount of gas input to each fire row can be accurately controlled; and the air collected by the wind collecting cavity 102 is then distributed through the plurality of flow guide grooves 202, and the air is jetted to the corresponding gas jet holes 201 and / or fire row inlets through the air jet holes 203 at the exhaust end of each flow guide groove 202, so that the air in the wind collecting cavity 102 can be accurately guided to the inside of the corresponding fire row, the amount of air input to each fire row can be accurately controlled, and each fire row can input sufficient amount of air to make the gas burn sufficiently and effectively, thereby reducing the emission of CO in the flue gas. The technical scheme of the present application can accurately control the amount of gas and air input to each fire row, ensure the sufficiency and consistency of the combustion of each fire row, and reduce the emission of CO in the flue gas.

[0085] Please combine Figures 8 to 11 The traditional burner (without the flow guide device 100) and the burner (with the flow guide device 100) of an embodiment of the present application are simulated and calculated for comparison. Among them, Figure 8 is the cross-sectional turbulent intensity cloud diagram of the fire row inlet of the traditional burner (without the flow guide device 100); Figure 9 is the cross-sectional turbulent intensity cloud diagram of the fire row inlet of the burner (with the flow guide device 100) of an embodiment provided by the present application; Figure 10 is the cross-sectional velocity vector diagram of the fire row inlet of the traditional burner (without the flow guide device 100); Figure 11 is the cross-sectional velocity vector diagram of the fire row inlet of the burner (with the flow guide device 100) of an embodiment provided by the present application.

[0086] Compare Figure 8 and Figure 9 It can be obviously seen that the burner provided by the present application has the flow guide device 100, and the turbulent intensity at each fire row inlet is much greater than that of each fire row inlet cross section of the traditional burner without the flow guide device, and the chaotic flow field can accelerate and promote the sufficient mixing of gas and air.

[0087] Compare Figure 10 and Figure 11It can be obviously seen by comparison that the combustor with the flow guide device 100 produces two additional vortexes at the position close to the wall surface at the fire grate inlet, which can promote the mutual collision and fusion between the gas and air molecules, and further improve the mixing degree of the gas and air.

[0088] The application further provides a water heater, which comprises the combustor, and the specific structure of the combustor is referred to the above-mentioned embodiments. Since the water heater adopts all the technical solutions of the above-mentioned embodiments, it has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0089] The above is only an exemplary embodiment of the application, and does not limit the protection scope of the application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like made under the technical concept of the application, and by using the content of the specification and drawings, are included in the protection scope of the application.

Claims

1. A flow guiding device for a burner having a plurality of burner bars, characterized in that, The flow guiding device includes: An air collecting hood is provided with an air inlet and an air collecting chamber communicating with the air inlet; and A flow guide is provided on the air collecting hood and is used to be arranged opposite to the burner inlets of the plurality of burners. The flow guide is provided with a plurality of gas jet holes and a plurality of flow guide grooves. The gas jet holes are used to communicate one-to-one with the burner inlets. The flow guide grooves are arranged one-to-one with the gas jet holes. The air inlet end of each flow guide groove is connected to the air collecting chamber. The exhaust end of each flow guide groove is provided with an air jet hole. Each flow guide groove jets air to the corresponding gas jet hole and / or the burner inlet through the air jet hole. In the direction from the inlet end of the gas jet orifice toward the outlet end, the central axis of the air jet orifice is inclined toward the side closer to the central axis of the gas jet orifice.

2. The flow guiding device as described in claim 1, characterized in that, The air jet direction and the gas jet direction form an angle α, which is not less than 20° and not greater than 70°.

3. The flow guiding device as described in claim 1, characterized in that, The air jet hole at the exhaust end of each of the aforementioned guide channels includes a first jet hole, which penetrates the inner peripheral wall of the corresponding gas jet hole to jet air into the corresponding gas jet hole. And / or, the air jet hole at the exhaust end of each of the guide channels includes a second jet hole that penetrates the guide member on the side facing the burner inlet to jet air to the corresponding burner inlet.

4. The flow guiding device as described in claim 3, characterized in that, Each of the flow guide channels has a plurality of first jet holes at its exhaust end. The plurality of first jet holes are arranged at intervals to form a first jet ring. The first jet ring surrounds the inner peripheral wall of the corresponding gas jet hole. And / or, each of the guide channels has a plurality of second jet holes at its exhaust end, the plurality of second jet holes being arranged at intervals to form a second jet ring, the second jet ring surrounding the periphery of the corresponding gas jet hole.

5. The flow guiding device as described in claim 4, characterized in that, Each of the flow guide channels has a plurality of first jet holes and a plurality of second jet holes at its exhaust end. The plurality of first jet holes are arranged at circumferential intervals along the corresponding gas jet holes to form a first jet ring. The plurality of second jet holes are arranged at circumferential intervals along the gas jet holes to form a second jet ring. The first jet ring and the second jet ring are coaxially arranged.

6. The flow guiding device as described in claim 5, characterized in that, In the direction from the inlet end of the gas jet orifice toward the outlet end, the jet directions of multiple first jet orifices of the same first jet ring converge toward the center position on the side away from the inlet end of the gas jet orifice. And / or, in the direction from the inlet end of the gas jet orifice toward the outlet end, the jet directions of a plurality of second jet orifices of the same second jet ring converge toward a central position on a side away from the inlet end of the gas jet orifice.

7. The flow guiding device as described in claim 5, characterized in that, In the first jet ring and the second jet ring corresponding to the same gas jet orifice, the first jet orifice and the second jet orifice are arranged offset in the circumferential direction of the corresponding gas jet orifice.

8. The flow guiding device as described in any one of claims 1 to 7, characterized in that, The flow guide includes a housing and a plurality of partition plates disposed within the housing. The plurality of partition plates are arranged at intervals along a first direction to divide the inner cavity of the housing into a plurality of flow guide grooves arranged at intervals along the first direction. Each flow guide groove is provided with a flow guide cylinder extending along a second direction. The two ends of each flow guide cylinder penetrate the opposite sides of the housing, and the inner peripheral wall of each flow guide cylinder forms the gas jet hole. The cylinder wall of the flow guide cylinder and / or the side wall of the housing are provided with the air jet hole. The first direction intersects the second direction.

9. The flow guiding device as described in any one of claims 1 to 7, characterized in that, The air collecting hood includes an air distribution plate, and the air guide is disposed on one side of the air distribution plate. The outer side of the air distribution plate and the outer side of the air guide together define an accommodating space for accommodating multiple fire racks. The air distribution plate is provided with multiple air outlets that connect the air collecting chamber to the accommodating space.

10. The flow guiding device as described in claim 9, characterized in that, The plurality of gas jet holes are arranged at intervals along a first direction, and the plurality of air outlet holes include multiple rows of air outlet hole groups arranged at intervals along the first direction. Each row of air outlet hole groups includes a plurality of air outlet holes arranged at intervals along a second direction. The first direction and the second direction intersect. In the first direction, the air outlet area of ​​the air outlet hole group located in the outermost row is smaller than the air outlet area of ​​the air outlet hole group located in the middle.

11. A burner, characterized in that, include: Multiple fire bars, each fire bar having a fire bar inlet; as well as According to any one of claims 1 to 10, the flow guiding device has a plurality of gas jet holes that are connected one-to-one with the burner inlets of the plurality of burners, and the plurality of flow guiding grooves of the flow guiding device jet air to the corresponding gas jet holes and / or burner inlets through air jet holes.

12. A water heater, characterized in that, Includes the burner as described in claim 11.

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