Combustor and gas water heater

Abstract

The utility model belongs to the technical field of gas water heaters, and particularly discloses a burner and a gas water heater. The combustor comprises a plurality of fire grate structures arranged in parallel, premixing cavities are formed in the fire grate structures, main fire holes communicated with the premixing cavities are formed in the tops of the fire grate structures, the combustor further comprises flow guide plates arranged between the adjacent fire grate structures, the flow guide plates extend in the length direction of the fire grate structures, and every two adjacent flow guide plates are spaced to form a guide channel. The guide plate is provided with a guide part, the guide part is obliquely arranged from bottom to top in the direction close to the main fire hole in the height direction of the fire grate structure so as to reduce the circulation area of the guide channel, and the lower end of the guide part is higher than the fire grate structure. The height of flame formed by the burner is low, and the flame cannot incline.

Description

Technical Field

[0001] This utility model relates to the field of gas water heater technology, and in particular to burners and gas water heaters. Background Technology

[0002] A burner is a combustion appliance that thoroughly mixes gas and air, ensuring complete combustion and transferring heat to the heat exchanger. For forced-draft gas water heaters with the fan positioned above the burner, the burner plate is often designed with a V-shape. Gas is ejected from the burner holes in the V-shaped area, forming intersecting airflows at a certain angle. The V-shape creates an energy-concentrating effect. However, the burner of forced-draft gas water heaters is limited by the size of the premixing and expansion sections of the premixing cavity. This results in insufficient primary air supply and uneven mixing of gas and primary air. After the gas and primary air mix and flow out of the burner holes, they need to be remixed with external secondary air to improve combustion efficiency. However, the V-shaped burner plate causes the flame to converge inwards, which is not conducive to secondary air supply. The extended time for secondary air to participate in the combustion reaction results in a high overall flame height, posing a risk of burning the upper heat exchange fins. Utility Model Content

[0003] The first technical problem solved by this invention is to provide a burner that can solve the problem that the overall flame height of existing burners is too high, causing the flame to burn onto the upper heat exchange fins.

[0004] The second technical problem solved by this utility model is to provide a gas water heater whose burner can solve the problem that the overall height of the flame in existing burners is too high, causing the flame to burn the upper heat exchange fins.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A burner is provided, comprising multiple parallel burner structures, each burner structure having a premixing chamber inside. A main flame port communicating with the premixing chamber is provided at the top of each burner structure. The burner also includes guide plates disposed between adjacent burner structures. The guide plates extend along the length of each burner structure, and adjacent guide plates are spaced apart to form a guide channel. Each guide plate has a guide portion. Along the height direction of the burner structure, the guide portions are inclined upwards towards the main flame port to reduce the flow area of ​​the guide channel. The lower end of the guide portion is higher than the burner structure.

[0007] Compared with the prior art, the burner of this utility model has the following advantages: It has a guide plate disposed between adjacent burner structures, extending along the length of the burner structure, forming a guide channel between two adjacent guide plates, along which secondary air flows. The guide plate has a guide portion, which is inclined upwards towards the main burner hole along the height direction of the burner structure, gradually reducing the flow area of ​​the guide channel. The lower end of the guide portion is higher than the top of the burner structure. This allows the secondary air between adjacent burner structures to accelerate upwards, forming an ejector premix, thereby accelerating the outer flame combustion. The secondary air is quickly and forcibly guided to the outer flame along the guide channel, enhancing the secondary combustion progress, resulting in faster combustion of the gas, shortening the overall height of the combustion flame, and avoiding the risk of combustion to the heat exchange fins above. Simultaneously, because the lower end of the guide portion is higher than the top of the burner structure, the intersection height between the secondary air and the combustion flame front is high, preventing interference with the stability of the flame root and ensuring that the combustion flame does not tilt.

[0008] In one embodiment, the fire rack structure includes a fire hole plate, which is formed by two fire hole plate bodies connected to each other at an included angle. Along the height direction, the two fire hole plate bodies are inclined from bottom to top toward each other, and the fire hole plate body is provided with the main fire hole.

[0009] In one embodiment, the included angle between the two fire hole plates is α, 150°≤α≤170°; and / or,

[0010] Along the height direction, the height of the fire hole plate is H1, where 1.0mm ≤ H1 ≤ 1.8mm.

[0011] In one embodiment, along the length of the fire vent structure, the fire hole plate further includes side plates disposed on both sides, the side plates being respectively connected to the lower end of the fire hole plate body, and the side plates having a plurality of auxiliary fire holes, the plurality of auxiliary fire holes being spaced apart along the length of the fire vent structure.

[0012] In one embodiment, the angle between the guide portion and the height direction is β, where 5°≤β≤15°.

[0013] In one embodiment, along the height direction, the upper half of the flame formed at the main fire hole is at least partially located within the guide channel.

[0014] In one embodiment, the guide plate further includes an auxiliary guide portion, which is arranged parallel to the height direction and connected to the lower end of the guide portion, and the lower end of the auxiliary guide portion is higher than the fire hole plate.

[0015] In one embodiment, the guide plate is integrally bent from a sheet metal part to form a pair of symmetrically arranged guide portions and a pair of symmetrically arranged auxiliary guide portions, and the connection between the two auxiliary guide portions forms a bend rounded corner.

[0016] In one embodiment, the burner further includes an outer frame support, which has through-ends at both ends and an internal combustion chamber. The upper opening of the outer frame support forms a combustion port. The burner structure is disposed within the combustion chamber, and the baffle is disposed at the combustion port.

[0017] In one embodiment, the burner further includes a mounting plate with a mounting groove, the guide plate being embedded in the mounting groove, and the guide portion being located above the mounting groove. The mounting plate is detachably connected to the outer frame bracket.

[0018] The second technical problem mentioned above is solved by the following technical solution:

[0019] A gas water heater is provided, including the burner described above.

[0020] Compared with the prior art, the gas water heater of this utility model has the following advantages: It features a burner with a guide plate that forms a gradually narrowing flow area, accelerating the secondary air between adjacent burner structures from bottom to top to form an ejector premix, thereby accelerating the outer flame combustion. This further enhances the secondary combustion process, resulting in faster gas burnout, shortening the overall flame height, and avoiding the risk of combustion to the upper heat exchange fins. Furthermore, because the lower end of the guide section is higher than the top of the burner structure, the intersection height between the secondary air and the flame front is higher, preventing interference with the stability of the flame root and ensuring the flame does not tilt. Attached Figure Description

[0021] Figure 1 A schematic diagram of the burner provided in an embodiment of this utility model;

[0022] Figure 2 This is a structural disassembly diagram of the burner provided in an embodiment of the present utility model;

[0023] Figure 3 A combustion diagram of the burner provided in an embodiment of this utility model;

[0024] Figure 4 A cross-sectional view of the fire-perforated plate provided in an embodiment of this utility model;

[0025] Figure 5 A side view of the structure of the fire-perforated plate provided in an embodiment of this utility model;

[0026] Figure 6A top view of the fire-perforated plate provided in an embodiment of this utility model;

[0027] Figure 7 The main structural view of the guide plate provided in the embodiment of this utility model;

[0028] Figure 8 A cross-sectional view of the burner provided in an embodiment of this utility model;

[0029] Figure 9 A schematic diagram of the installation structure of the guide plate provided in an embodiment of this utility model;

[0030] Figure 10 This is a top view of the burner provided in an embodiment of the present invention.

[0031] Label Explanation:

[0032] 1. Burner structure; 10. Premixing chamber; 11. Burner plate; 111. Burner plate body; 1110. Burner group; 1111. Main burner; 112. Side plate; 1121. Auxiliary burner; 12. Burner body;

[0033] 2. Deflector plate; 20. Guide channel; 21. Guide section; 22. Auxiliary guide section; 23. Mounting section;

[0034] 3. Outer frame support; 31. Combustion chamber; 32. Combustion port;

[0035] 4. Mounting plate; 41. Mounting slot;

[0036] 100. Combustion flame; 101. Inner flame; 200. Steady flame. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be understood that the terms "length direction", "width direction", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] like Figure 1 and Figure 2 As shown, this utility model embodiment first provides a burner, which includes multiple parallelly arranged burner structures 1. Each burner structure 1 has a premixing chamber 10 inside, where air and fuel gas are premixed once. A main flame port 1111 communicating with the premixing chamber 10 is provided at the top of each burner structure 1. The burner also includes guide plates 2 disposed between adjacent burner structures 1. The guide plates 2 extend along the length of each burner structure 1, and a guide channel 20 is formed between two adjacent guide plates 2, such as... Figure 3 As shown, secondary air flows along the guide channel 20. The guide plate 2 has a guide section 21, which is inclined upwards towards the main burner hole 1111, reducing the flow area of ​​the guide channel 20. Since the lower end of the guide section 21 is higher than the top of the burner structure 1, the secondary air between adjacent burner structures 1 forms an ejector premix, accelerating the combustion of the outer flame of the combustion flame 100. The secondary air is forced to flow along the guide channel 20 to the outer flame of the combustion flame 100, further enhancing the secondary combustion progress, making the gas burn more quickly, shortening the overall height of the combustion flame 100, and avoiding the risk of combustion to the heat exchange fins above. At the same time, since the lower end of the guide section 21 is higher than the burner structure 1, the intersection height between the secondary air and the front of the combustion flame 100 is high, which will not interfere with the stability of the flame root and ensure that the combustion flame 100 will not tilt.

[0041] Furthermore, along the height direction, at least part of the upper half of the flame formed at the main burner 1111 is located in the guide channel 20. That is, the guide channel 20 formed by two adjacent guide sections 21 is located above half of the height of the flame formed at the main burner 1111. In this way, on the one hand, because the thickness of the upper half of the flame gradually becomes thinner, the secondary air in the guide channel 20 can better supplement the outer flame of the flame, enhance the combustion progress of the combustion gas, and make the combustion gas burn out faster, thereby more effectively shortening the overall height of the combustion flame 100; on the other hand, it also ensures that the intersection height of the secondary air and the front of the combustion flame 100 is relatively high, which will not interfere with the stability of the flame root and ensure that the combustion flame 100 will not tilt.

[0042] A perforated plate 11 is provided at the top of the fire grate structure 1. The perforated plate 11 is formed by two perforated plate bodies 111 connected to each other at an included angle. Along the height direction of the fire grate structure 1, the two perforated plate bodies 111 are inclined from bottom to top towards each other. The perforated plate bodies 111 have main fire holes 1111 that connect to the premixing chamber 10 to form a combustion flame 100. That is, the two perforated plate bodies 111 form an inverted V structure. Because the flame temperature on both sides is high and the temperature in the middle is low, heat is transferred from high temperature to low temperature. The flames on both sides of the perforated plate 11 first expand outward and then contract, and the overall height of the combustion flame 100 is reduced. Moreover, the secondary air between adjacent fire grate structures 1 is drawn in by the outer flame of the combustion flame 100 due to the pressure difference. The contact reaction time between the secondary air and the combustion flame 100 is greatly shortened, which accelerates the replenishment of secondary air to enhance the combustion intensity and avoids the problem of excessive flue gas emissions caused by untimely replenishment of secondary air.

[0043] In one embodiment, the included angle between the two fire hole plates 111 is α, such as... Figure 4 As shown, 150°≤α≤170°, for example, the included angle α can be 150°, 160°, or 170°. Along the height direction, the height of the fire hole plate 111 is H1, 1.0mm≤H1≤1.8mm, for example, H1 can be 1.0mm, 1.2mm, 1.5mm, or 1.8mm.

[0044] To enhance the flame stabilization effect, along the length of the firebox structure 1, the fire hole plate 11 also includes side plates 112 disposed on both sides, such as... Figure 5 As shown, two side plates 112 are respectively connected to the lower end of the flame hole plate 111. The side plates 112 have multiple auxiliary flame holes 1121, which are spaced apart along the length of the flame bar structure 1. The auxiliary flame holes 1121 form a stable flame 200, which stabilizes the central combustion flame 100. The diameter D of the auxiliary flame holes 1121 ranges from 0.8mm to 1.5mm; for example, the diameter D can be 0.8mm, 1.0mm, 1.2mm, or 1.5mm.

[0045] In one embodiment, such as Figure 6 As shown, the arrangement of the main flame holes 1111 is as follows: multiple main flame holes 1111 form multiple sets of flame hole groups 1110, and each flame hole group 1110 includes multiple main flame holes 1111, which can form a relatively concentrated flame cluster. The multiple flame hole groups 1110 are spaced apart along the length of the fire rack structure 1 to form stable combustion. The extension dimension of the main flame holes 1111 along the width of the fire rack structure 1 is the length dimension. Due to their different positions, the multiple sets of flame hole groups 1110 have different dimensional structures and arrangement forms. Figure 5 and Figure 6Taking this as an example, the flame hole groups 1110 located at both ends of the flame grid structure 1 have three main flame holes 1111 of different lengths, with long flame holes and two types of short flame holes spaced apart along the length of the flame grid structure 1. The flame hole group 1110 located in the middle of the flame grid structure 1 also has two main flame holes 1111 of different lengths, with long flame holes and short flame holes spaced apart along the length of the flame grid structure 1. The arrangement of the two types of short flame holes in the flame hole groups 1110 at the ends facilitates flame propagation and flame stabilization.

[0046] The area of ​​the flame holes formed by multiple sets of flame hole groups 1110 is Fp1, and the area of ​​the flame holes formed by multiple auxiliary flame holes 1121 is Fp2. Therefore, for a single burner structure 1, its total flame hole area is Fp_single = Fp1 + Fp2. According to the common combustion power requirements of burners, the range of the total flame hole area of ​​a single burner structure 1 is 350 mm. 2 ≤Fp single≤400mm 2 Furthermore, by considering the burner's heat load, the heat intensity q of the burner holes can be calculated. p The height H3 of the inner flame 101 is calculated, and in this embodiment, H3 is approximately 42 mm. The distance between the upper fins can be designed based on this height dimension.

[0047] In one embodiment, the angle between the guide portion 21 and the vertical direction is β, such as... Figure 7 As shown, 5°≤β≤15°, this tilt angle of the guide part 21 can form a tilted guide for the secondary air without affecting the primary combustion of the combustion flame 100.

[0048] In one embodiment, the deflector 2 further includes an auxiliary guide section 22, which is arranged parallel to the height direction and connected to the lower end of the guide section 21. The lower end of the auxiliary guide section 22 is higher than the top end of the flame orifice plate 11. The auxiliary guide section 22 can assist in guiding secondary air, allowing more secondary air to enter the guide channel 20 to enhance combustion.

[0049] To simplify the manufacturing process of the deflector 2, the deflector 2 is integrally bent from sheet metal to form a pair of symmetrically arranged guide portions 21 and a pair of symmetrically arranged auxiliary guide portions 22, with a rounded bend at the connection point of the two auxiliary guide portions 22. The deflector 2 formed by integral bending has better structural strength and a lower risk of deformation compared to a single guide portion 21 and auxiliary guide portion 22.

[0050] The burner forms a combustion space through the outer frame support 3, such as Figure 8As shown. The outer frame support 3 has through-holes at both ends and a combustion chamber 31 inside. The upper opening of the outer frame support 3 forms a combustion port 32. The fire rack structure 1, the fire rack body 12, and the fire hole plate 11 are set in the combustion chamber 31. The guide plate 2 is set at the combustion port 32. This installation position allows the lower end of the auxiliary guide part 22 to be higher than the top end of the fire hole plate 11.

[0051] It should be noted that the distance between the guide plate 2 and the fire grid structure 1 can be set according to the upper part of the flame formed when the guide part 21 is higher than the main fire hole 1111 during actual use. Therefore, the distance between the guide plate 2 and the fire grid structure 1 will not be described again.

[0052] To simplify the installation structure of the baffle 2, the burner also includes a mounting plate 4, such as... Figure 9 As shown, the mounting plate 4 has a mounting groove 41, the guide plate 2 is embedded in the mounting groove 41, and the guide part 21 is located above the mounting groove 41. After the guide plate 2 is in place, it is reinforced by spot welding to ensure a reliable connection between the mounting plate 4 and the guide plate 2. The mounting plate 4 is detachably connected to the outer frame bracket 3. Specifically, the combustion port 32 of the outer frame bracket 3 is provided with an overlapping edge, and the mounting plate 4 overlaps on the overlapping edge of the outer frame bracket 3 and is fastened with screws or other fasteners.

[0053] To facilitate the installation of the guide plate 2, the auxiliary guide part 22 has extended mounting parts 23 at both ends, so that the mounting parts 23 can be embedded in the mounting groove 41.

[0054] Because the combustion flame 100 formed by the inverted V-shaped flame plate 11 first expands outward and then contracts inward, the contact area with secondary air increases. Therefore, the spacing between adjacent flame bar structures 1 needs to be ensured. In this embodiment, the spacing L1 between adjacent flame bar structures 1 is as follows: Figure 10 As shown, the value range is L1≥18mm.

[0055] This utility model embodiment also provides a gas water heater, including the burner as described above. The guide plate 2 of the burner is inclined from bottom to top towards the main burner hole 1111 via the guide part 21 to form a guide channel 20 with a gradually decreasing flow area. This allows the secondary air between adjacent burner structures 1 to be accelerated from bottom to top to form ejector premixing, thereby accelerating the combustion of the outer flame of the combustion flame 100. At the same time, because the lower end of the guide part 21 is higher, the secondary air is forced to flow along the guide channel 20 to the outer flame of the combustion flame 100, further enhancing the secondary combustion progress, making the gas burn out faster, shortening the overall height of the combustion flame 100, and avoiding the risk of combustion to the heat exchange fins above. At the same time, because the lower end of the guide part 21 is higher than the top of the burner structure 1, the intersection height of the secondary air and the front of the combustion flame 100 is higher, which will not interfere with the stability of the flame root and ensure that the combustion flame 100 will not tilt.

[0056] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0057] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A burner comprising a plurality of parallelly arranged burner structures (1), each burner structure (1) having a premixing chamber (10) inside, and a main flame port (1111) communicating with the premixing chamber (10) being provided at the top of each burner structure (1), characterized in that, The burner also includes a guide plate (2) disposed between adjacent burner structures (1). The guide plate (2) extends along the length direction of the burner structure (1). Two adjacent guide plates (2) are spaced to form a guide channel (20). The guide plate (2) has a guide portion (21). Along the height direction of the burner structure (1), the guide portion (21) is inclined from bottom to top toward the direction close to the main burner hole (1111) to reduce the flow area of ​​the guide channel (20). The lower end of the guide portion (21) is higher than the burner structure (1).

2. The burner according to claim 1, characterized in that, The fire rack structure (1) includes a fire hole plate (11), which is formed by two fire hole plate bodies (111) arranged at an angle to each other. Along the height direction, the two fire hole plate bodies (111) are inclined from bottom to top towards each other. The fire hole plate body (111) is provided with the main fire hole (1111).

3. The burner according to claim 2, characterized in that, The included angle between the two fire hole plates (111) is α, 150°≤α≤170°; and / or, Along the height direction, the height of the fire hole plate (111) is H1, 1.0mm≤H1≤1.8mm.

4. The burner according to claim 2, characterized in that, Along the length of the fire vent structure (1), the fire hole plate (11) also includes side plates (112) disposed on both sides. The side plates (112) are respectively connected to the lower end of the fire hole plate body (111). The side plates (112) are provided with a plurality of auxiliary fire holes (1121). The plurality of auxiliary fire holes (1121) are spaced apart along the length of the fire vent structure (1).

5. The burner according to claim 1, characterized in that, The angle between the guide part (21) and the height direction is β, where 5°≤β≤15°.

6. The burner according to claim 1, characterized in that, Along the height direction, the upper half of the flame formed at the main fire hole (1111) is at least partially located within the guide channel (20).

7. The burner according to claim 2, characterized in that, The guide plate (2) also includes an auxiliary guide section (22), which is arranged parallel to the height direction and connected to the lower end of the guide section (21). The lower end of the auxiliary guide section (22) is higher than the fire hole plate (11).

8. The burner according to claim 7, characterized in that, The guide plate (2) is formed by integrally bending a sheet metal part to form a pair of symmetrically arranged guide parts (21) and a pair of symmetrically arranged auxiliary guide parts (22), and the connection between the two auxiliary guide parts (22) forms a bend rounded corner.

9. The burner according to any one of claims 1-8, characterized in that, The burner also includes an outer frame support (3), which has two through-holes and a combustion chamber (31) inside. The upper opening of the outer frame support (3) forms a combustion port (32). The burner structure (1) is disposed in the combustion chamber (31), and the guide plate (2) is disposed at the combustion port (32).

10. The burner according to claim 9, characterized in that, The burner also includes a mounting plate (4), which has a mounting groove (41). The guide plate (2) is embedded in the mounting groove (41), and the guide part (21) is located above the mounting groove (41). The mounting plate (4) is detachably connected to the outer frame bracket (3).

11. A gas-fired water heater, characterized in that, Including the burner as described in any one of claims 1-10.

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