Fire grate, burner and gas heating equipment

Abstract

The utility model belongs to the technical field of combustion, and particularly discloses a fire grate, a combustor and gas heating equipment. The fire grate comprises an inner shell, an inner core head and a rectification inner core. An injection channel and a first flame channel which communicate with each other are formed in the inner shell, and the upper end of the first flame channel is open; the inner core head comprises a fire hole plate covering an opening in the upper end of the first flame channel, and at least three first fire holes are formed in the fire hole plate in the first direction of the fire row; the rectifying inner core is vertically inserted into the first flame channel, the rectifying inner core and the two side walls, in the first direction, of the inner shell are arranged at intervals, the upper portion of the first flame channel is divided into a plurality of sub-flow channels through the rectifying inner core, and the upper end of each sub-flow channel communicates with the corresponding first fire hole. According to the fire grate, the combustor and the fuel gas heating equipment, the structure of the fire grate can be simplified while the combustion stability is improved, the machining difficulty of the fire grate is reduced, and therefore the cost of the combustor and the fuel gas heating equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion, in particular to a fire grate, a burner and a gas heating device. Background Art

[0002] The burners currently used in gas water heaters, gas wall-mounted boilers and other equipment are usually row-shaped burners, which include multiple fire rows arranged side by side, each fire row has an injection channel and a gas channel connected in sequence, and a fire hole connected to the gas channel is opened at the upper end of the fire row. After the gas enters through the injection port of the injection channel, it mixes with the air injected into the injection channel at the same time to form a mixed gas with a certain amount of air and gas, and the mixed gas flows out of the fire hole and is ignited and burned.

[0003] The prior art provides a fire bar, which includes an inner shell, an outer shell and a fire hole plate. The inner shell has a light flame channel, the outer shell is sleeved on the outer side of the inner shell and encloses the inner shell to form a strong flame channel, the upper end of the strong flame channel is open to form a strong flame hole; the fire hole plate cover is arranged on the upper end of the light flame channel, and the fire hole plate is provided with a light flame hole.

[0004] The fire grate provided by the prior art can realize rich-lean combustion by arranging rich-fire holes outside the two sides of the light-fire hole, improve the combustion completeness and reduce the nitrogen oxide content during the combustion process, and the size of the light-fire hole arranged thereon can be controlled by arranging a fire hole plate to control the size of the light flame. However, the fire grate provided by the prior art is easy to have turbulence and flow out of the light-fire hole too fast when the mixed gas flows from the light-fire channel to the light-fire hole because the light-fire channel has a large width and the light-fire hole is relatively small in size, which affects the stability of the mixed gas flowing out of the light-fire hole and causes the problem of flameout, thereby affecting the operating stability and safety of the burner and the gas water heater and other equipment used in the burner. Utility Model Content

[0005] One of the technical problems solved by the utility model is to provide a fire grate, which can effectively solve the problem of turbulence and excessive flow rate of mixed gas in the process of flowing from the flame channel to the fire hole in the prior art, improve the rectification effect of the mixed gas flow, and thus improve the combustion stability of the fire grate.

[0006] The second technical problem solved by the present invention is to provide a burner which can effectively solve the problem of unstable operation of the existing burner caused by unstable combustion of the fire grate, and improve the operating stability and combustion sufficiency of the burner.

[0007] The third technical problem solved by the utility model is to provide a gas heating equipment, which can effectively solve the problem that the operating stability of the gas heating equipment is affected due to the poor operating stability of the burner in the existing gas heating equipment, and improve the operating stability of the gas heating equipment.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] A fire brigades, comprising:

[0010] An inner shell has an introduction channel and a first flame channel inside, wherein the lower end of the first flame channel is connected to the introduction channel, and the upper end of the first flame channel is open;

[0011] The inner core head includes a fire hole plate covering the upper open end of the first flame channel, wherein the fire hole plate is provided with at least three first fire holes along a first direction, and the first direction is the width direction of the fire row;

[0012] A rectifying inner core is vertically inserted in the first flame channel and spaced apart from the two side walls of the inner shell in the first direction. The rectifying inner core divides the upper part of the first flame channel into a plurality of sub-channels along the first direction. The sub-channels and the first fire holes are arranged one-to-one in the first direction, and the upper end of each sub-channel is connected to the corresponding first fire hole.

[0013] Compared with the background technology, the fire grate described in the utility model has the following beneficial effects: by providing a fire hole plate covering the upper end of the first flame channel and providing the first fire hole on the fire hole plate, it is convenient to realize the processing and dimensional accuracy control of the first fire hole, thereby ensuring the flame combustion stability at the first fire hole; by providing a rectifying inner core in the first flame channel, so that the first flame channel is divided into a plurality of sub-flow channels by the rectifying inner core, the mixed gas entering the first flame channel is diverted and rectified when flowing through the rectifying inner core, thereby reducing the probability of turbulence of the mixed gas when flowing in the first flame channel, improving the stability of the mixed gas flowing out of the first fire hole, and further improving the combustion stability; at the same time, by providing the rectifying inner core to rectify the mixed gas in the first flame channel, the flow rate of the mixed gas flowing out of the first fire hole can be slowed down, the flame at the first fire hole can be prevented from being de-fired, and the combustion stability and reliability of the fire grate can be further improved;

[0014] In one embodiment, the rectifying inner core includes two rectifying plate portions that are opposite to and spaced apart from each other in the first direction, the rectifying plate portions are vertically arranged, the plurality of sub-flow channels include a first sub-flow channel located between the two rectifying plate portions and two second sub-flow channels located on both sides of the rectifying inner core, the first fire hole corresponding to the first sub-flow channel is a middle fire hole, and the first fire hole corresponding to the second sub-flow channel is a side fire hole;

[0015] And / or, the lower end of the rectifying inner core extends to the lower part of the first flame channel.

[0016] In one embodiment, the size of the middle fire hole in the first direction is 0.5 mm to 1.5 mm;

[0017] and / or, the size of the side fire hole in the first direction is 0.7 mm to 2 mm;

[0018] And / or, the ratio of the size of the side fire hole in the first direction to the size of the middle fire hole in the first direction is 1.2 to 1.5.

[0019] In one embodiment, the fire hole plate includes two fire hole sub-plates arranged side by side and at intervals along the first direction, each of the fire hole sub-plates is integrally bent and connected to the upper end of the rectifying plate portion on the same side, the middle fire hole is formed between the two fire hole sub-plates, and each of the fire hole sub-plates is provided with the side fire hole;

[0020] Alternatively, the fire hole plate is integrally formed and abuts against the upper end of the rectifying inner core.

[0021] In one of the embodiments, the fire hole plate includes two fire hole sub-plates arranged in a V shape, each of the fire hole sub-plates is provided with the side fire hole, and the middle fire hole is provided between the two fire hole sub-plates.

[0022] In one of the embodiments, the fire hole plate has rectifying flanges extending downwardly on both sides along the first direction, and the rectifying flanges are vertically arranged and in contact with the outer wall or the inner wall of the inner shell.

[0023] In one embodiment, the rectifying flange portion is in contact with the outer side wall of the inner shell, and the lower end of the rectifying flange portion is folded upward to form a reinforcing flange portion, and the reinforcing flange portion is in contact with a side of the rectifying flange portion facing away from the inner shell.

[0024] In one embodiment, the fire bar further comprises an outer shell, the outer shell is sleeved on the outer side of the inner shell and is surrounded by the outer side wall of the inner shell to form a second flame channel, the lower end of the second flame channel is connected to the injection channel, the upper end of the second flame channel is open to form a second flame hole, one of the second flame hole and the first flame hole is a light flame hole, and the other is a strong flame hole;

[0025] The introduction channel includes a first introduction channel and a second introduction channel which are separated from each other, the lower end of the first flame channel is connected to the first introduction channel, the second flame channel is connected to the second introduction channel, the first introduction channel and the second introduction channel introduce mixed gases with different air-fuel ratios; and / or, both sides of the fire hole plate along the first direction are provided with abutment protrusions extending outwardly, the ends of the abutment protrusions abut against the inner side wall of the outer shell, and a plurality of abutment protrusions are spaced apart along the second direction, and the second direction is the length direction of the fire row.

[0026] The above second technical problem is solved by the following technical solution:

[0027] A burner comprises the fire grate in any one of the above embodiments.

[0028] Compared with the background technology, the burner described in the utility model has the following beneficial effects: by adopting the above-mentioned fire grate, the combustion completeness and stability of the burner can be improved, the nitrogen oxides generated during the combustion process can be reduced, and the structure of the burner can be simplified, thereby reducing the processing cost of the burner.

[0029] The third technical problem mentioned above is solved by the following technical solution:

[0030] A gas heating device comprises the above-mentioned burner.

[0031] Compared with the background technology, the gas heating equipment described in the utility model has the following beneficial effects: the gas heating equipment provided by the utility model, by adopting the above-mentioned burner, can improve the operating stability and reliability of the gas heating equipment, reduce the harmful gases generated during the operation of the gas heating equipment, and reduce the cost of the gas heating equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the structure of the fire grate provided in the first embodiment of the utility model;

[0033] Figure 2 A top view of the fire grate provided in Embodiment 1 of the utility model;

[0034] Figure 3 A cross-sectional view of a fire bar provided in Embodiment 1 of the present utility model;

[0035] Figure 4 A schematic diagram of the structure of the inner core head and the rectifying inner core provided in the first embodiment of the utility model;

[0036] Figure 5 A schematic diagram of the structure of the fire grate provided in the second embodiment of the present utility model;

[0037] Figure 6 A cross-sectional view of a fire grate provided in Embodiment 2 of the present utility model;

[0038] Figure 7 A schematic diagram of the structure of the inner core head provided in the second embodiment of the present utility model;

[0039] Figure 8 A schematic diagram of the structure of the rectifier core provided in the second embodiment of the present utility model;

[0040] Fig. 9 A cross-sectional view of a fire grate provided in Embodiment 3 of the present utility model;

[0041] Fig.10 A cross-sectional view of a fire grate provided in Embodiment 4 of the present utility model;

[0042] Fig.11 This is a cross-sectional view of the fire grate provided in Embodiment 5 of the present utility model.

[0043] Description of labels:

[0044] 1. Inner shell; 11. Inner half shell; 12. First flame channel; 121. Sub-flow channel; 121a. First sub-flow channel; 121b. Second sub-flow channel; 13. Injection channel; 13a. First injection channel; 13b. Second injection channel; 14. Inner shell profiling;

[0045] 2. Outer shell; 21. Outer half shell; 23. Connecting bridge;

[0046] 3. Inner core head; 31. Fire hole plate; 311. Fire hole sub-plate; 312. First fire hole; 312a. Middle fire hole; 312b. Side fire hole; 32. Rectification flange portion; 33. Abutment convex portion; 34. Strengthening flange portion;

[0047] 4. Rectification inner core; 41. Rectification plate portion; 42. Rectification profile; 42a. First profile; 42b. Second profile; 43. Diverter profile; 44. Connecting portion;

[0048] 5. The second flame channel; 6. The second flame hole. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] Embodiment 1

[0054] The present embodiment provides a fire grate, which can be applied to a burner, and which can improve the completeness and stability of combustion through the principle of dense-lean combustion, reduce the generation of nitrogen oxides during the combustion process, and at the same time increase the stability of the mixed airflow flowing out of the fire hole, thereby improving the combustion stability and combustion completeness.

[0055] like Figures 1 to 3As shown, the fire bar provided in this embodiment includes an inner shell 1, an outer shell 2, an inner core head 3 and a rectifying inner core 4. The inner shell 1 has an introduction channel 13 and a first flame channel 12, the lower end of the first flame channel 12 is connected to the introduction channel 13, and the upper end of the first flame channel 12 is open; the inner core head 3 includes a fire hole plate 31 covering the upper open end of the first flame channel 12, and the fire hole plate 31 is arranged with at least three first fire holes 312 arranged side by side and at intervals along the first direction; the rectifying inner core 4 is inserted into the first flame channel 12 and is arranged at intervals on both sides of the inner shell 1 along the first direction, and the rectifying inner core 4 divides the upper part of the first flame channel 12 into a plurality of sub-channels 121 along the first direction, and the plurality of sub-channels 121 and the plurality of first fire holes 312 are arranged one by one in the first direction, and the upper end of each sub-channel 121 is connected to the corresponding first fire hole 312. The outer shell 2 is sleeved on the upper end of the inner shell 1, and the outer shell 2 and the adjacent outer side walls of the inner shell 1 along the first direction form a second flame channel 5, and the upper end of the second flame channel 5 is open to form a second flame hole 6. The air-fuel ratio of the mixed gas in the second flame channel 5 is different from that in the first flame channel 12. The first direction is the width direction of the fire bar.

[0056] The fire row provided in the present embodiment is provided with a fire hole plate 31 covering the upper end of the first flame channel 12, and a first fire hole 312 is provided on the fire hole plate 31, which is conducive to the processing and dimensional accuracy control of the first fire hole 312, thereby ensuring the flame combustion stability at the first fire hole 312; by providing a rectifying inner core 4 in the first flame channel 12, so that the first flame channel 12 is divided into a plurality of sub-flow channels 121 by the rectifying inner core 4, so that the mixed gas entering the first flame channel 12 is diverted and rectified when flowing through the rectifying inner core 4, thereby reducing the probability of turbulence of the mixed gas when flowing in the first flame channel 12, and improving the mixed gas flowing out of the first flame channel 12. The stability of the fire hole 312 is improved, thereby improving the stability of combustion; at the same time, by setting the rectifying inner core 4 to rectify the mixed gas in the first flame channel 12, the flow rate of the mixed gas flowing out of the first fire hole 312 can be slowed down, avoiding the flame at the first fire hole 312 from being out of flame, and further improving the combustion stability and reliability of the fire grate; furthermore, by setting the second fire holes 6 on both sides of the first fire hole 312, and the air-fuel ratio of the mixed gas flowing out of the first fire hole 312 and the second fire hole 6 is different, the rich and thin combustion of the flame can be achieved, thereby improving the completeness of combustion, reducing the content of nitrogen oxides produced by combustion, and improving the safety of the fire grate.

[0057] It is worth noting that one of the first fire hole 312 and the second fire hole 6 is a light flame hole, and the other is a rich flame hole, so as to realize the light and rich combustion of the fire row. Light flame combustion requires more air, and rich flame combustion requires relatively less air, that is, the air-fuel ratio of the mixed gas in the light flame hole is greater than the air-fuel ratio of the mixed gas in the rich flame hole. As a result, the light flame burns under too much air, and the light flame is wrapped by too much air to reduce the temperature, while the rich flame is incompletely burned under oxygen-deficient conditions to reduce the temperature of the rich flame, thereby reducing the flame temperature as a whole, and then reducing the generation of nitrogen oxides; at the same time, since the two second fire holes 6 are located on both sides of the first fire hole 312, the fuel that is not fully burned in the rich flame can be further burned with the excess air in the light flame, thereby ensuring the full combustion of the fuel, reducing CO emissions while improving the utilization rate of the gas.

[0058] In one embodiment, the first fire hole 312 is a light flame hole, and the second fire hole 6 is a rich flame hole. In other embodiments, the first fire hole 312 may be a rich flame hole, and the second fire hole 6 may be a light flame hole. In other embodiments, the fire bar may not be provided with an outer shell 2.

[0059] For the convenience of description, the length direction of the fire bar is defined as the second direction. The first direction is perpendicular to the second direction, and the first direction and the second direction are perpendicular to the vertical direction.

[0060] In one embodiment, the introduction channel 13 includes a first introduction channel 13a and a second introduction channel 13b, and the first introduction channel 13a and the second introduction channel 13b are respectively formed with an introduction port on the same side of the fire bar. The lower end of the first flame channel 12 is connected to the first introduction channel 13a, and the lower end of the second flame channel 5 is connected to the second introduction channel 13b. The air-fuel ratio of the mixed gas formed by the introduction of the first introduction channel 13a and the second introduction channel 13b is different. By separately setting the first introduction channel 13a and the second introduction channel 13b, it is beneficial to control the amount of gas entering the first introduction channel 13a and the second introduction channel 13b respectively, and then control the air-fuel ratio in the first flame channel 12 and the second flame channel 5, thereby improving the flexibility of air-fuel ratio regulation.

[0061] In another embodiment, the inner shell 1 may be provided with only one injection channel 13, that is, the lower ends of the first flame channel 12 and the second flame channel 5 are connected to the same injection channel 13, and an air hole is provided on the outer wall of the outer shell 2, and the air hole is connected to the corresponding second flame channel 5, so that external air can pass through the air hole and then into the second flame channel 5, thereby mixing with the mixed gas entering the second flame channel 5, increasing the air amount of the mixed gas in the second flame channel 5, so that the air-fuel mixture in the second flame channel 5 and the first flame channel 12 is different.

[0062] It is understandable that there are many configurations in the prior art to achieve different air-fuel ratios in the first flame channel 12 and the second flame channel 5, and all of them can be applied to the present invention, and the present invention does not limit or elaborate on them.

[0063] The inner shell 1 includes two inner half shells 11 arranged opposite to each other in a first direction, and the two inner half shells 11 enclose an injection channel 13 and a first flame channel 12; the outer shell 2 includes two outer half shells 21 arranged opposite to each other in the first direction, and the two outer half shells 21 are respectively located on both sides of the inner shell 1 along the first direction, and each outer half shell 21 forms a second flame channel 5 with the adjacent inner half shell 11. The two ends of the two inner half shells 11 along the second direction are press-fitted and clamped between the corresponding ends of the two outer half shells 21.

[0064] It is worth mentioning that the manner and specific structure of the two inner half shells 11 enclosing the ejection channel 13 and the first flame channel 12 can be set with reference to the prior art, and the connection structure between the outer shell 2 and the inner shell 1 and the connection setting between the second flame channel 5 and the ejection channel 13 can be set with reference to the prior art. This is not the focus of the present utility model and will not be repeated here.

[0065] like Figure 2 and Figure 3 As shown, in one embodiment, the rectifying inner core 4 includes two rectifying plate portions 41 arranged opposite to each other and spaced apart in the first direction, the rectifying plate portions 41 are arranged vertically, and the two rectifying plate portions 41 separate the upper part of the first flame channel 12 along the first direction to form three sub-flow channels 121, and correspondingly, the fire hole plate 31 is provided with three first fire holes 312 arranged side by side and spaced apart along the first direction. Among them, the sub-flow channel 121 located between the two rectifying plate portions 41 is the first sub-flow channel 121a, and the sub-flow channel 121 located between the rectifying plate portion 41 and the inner wall of the adjacent inner shell 1 is the second sub-flow channel 121b; the first fire hole 312 corresponding to the first sub-flow channel 121a is the middle fire hole 312a, and the fire hole corresponding to the second sub-flow channel 121b is the side fire hole 312b.

[0066] Since the rectifying core 4 includes two rectifying plate portions 41 arranged opposite to each other, it is possible to achieve separation of the upper portion of the first flame channel 12 while simplifying the structure of the rectifying core 4 and reducing the difficulty of processing the rectifying core 4, thereby reducing the processing cost of the entire fire bar.

[0067] The rectifying core 4 extends in the vertical direction to the lower part of the first flame channel 12, that is, the height of the rectifying core 4 in the vertical direction is h, and the height of the first flame channel 12 in the vertical direction is H, H>h≥0.5H, thereby increasing the rectifying range of the rectifying core 4 and improving the rectifying effect of the rectifying core 4 on the flow of the mixed gas in the first flame channel 12.

[0068] In one embodiment, the width of the first sub-channel 121a in the first direction is smaller than the width of the second sub-channel 121b in the first direction, and the width of the middle fire hole 312a in the first direction is smaller than the width of the side fire hole 312b in the first direction, so that the flow rate of the mixed gas flowing out of the side fire hole 312b is lower than the flow rate of the mixed gas flowing out of the middle fire hole 312a, thereby playing a decelerating role and avoiding the flame at the middle fire hole 312a from being extinguished.

[0069] In one embodiment, the width of the middle fire hole 312a in the first direction is 0.5mm-1.5mm, and the width of the side fire hole 312b in the first direction is 0.7mm-2mm. Furthermore, the ratio of the width of the side fire hole 312b in the first direction to the width of the first fire hole 312 in the first direction is 1.2-1.5.

[0070] In one embodiment, the upper end of each inner half shell 11 is inwardly recessed to form an inner shell profile 14, the inner shell profile 14 is spaced apart from the rectifying plate portion 41, and the lower end of the inner shell profile 14 is higher than the lower end of the rectifying plate portion 41, and the inner shell profile 14 extends to both ends of the inner shell 1 along the second direction. The arrangement of the inner shell profile 14 can make the second sub-channel 121b have a narrowing area, so that the second sub-channel 121b forms a contraction area, a mixing area and a diffusion area from bottom to top, and appropriately increases the flow rate of the premixed gas flowing to the upper end of the second sub-channel 121b; at the same time, because the upper end width of the second sub-channel 121b is greater than the width of the second sub-channel 121b at the inner shell profile 14, the premixed gas flowing out of the narrowing area of ​​the second sub-channel 121b can be smoothed in the upper end area of ​​the second sub-channel 121b, ensuring the stability of the premixed gas flowing out of the side fire hole 312b.

[0071] In one embodiment, the fire hole plate 31 has a rectifying flange portion 32 extending downward on both opposite sides along the first direction, and the rectifying flange portion 32 is vertically arranged and fits with the inner side wall or the inner side wall of the inner shell 1. The arrangement of the rectifying flange portion 32, on the one hand, can realize the installation and positioning of the inner core head 3 and the inner shell 1, and improve the assembly efficiency and assembly reliability of the inner core head 3 and the inner shell 1; on the other hand, the vertically arranged rectifying flange portion 32 is also conducive to guiding the mixed gas flowing through the rectifying flange portion 32 to flow vertically upward, so as to facilitate the mixed gas at the corresponding flame channel to flow vertically upward out of the corresponding fire hole, and ensure the vertical combustion of the flame at the corresponding fire hole.

[0072] In one embodiment, the rectifying flange portion 32 is located on the outside of the inner shell 1, that is, the rectifying flange portion 32 abuts against the outer wall of the inner shell 1, so that the rectifying flange portion 32 can rectify the mixed gas flowing from the second flame channel 5 to the second fire hole 6; at the same time, this arrangement is also beneficial to ensure the verticality of the upper end of the inner shell 1 through the cooperation between the rectifying flange portion 32 and the upper end of the inner shell 1, thereby realizing the rectification of the mixed gas flowing out of the side fire hole 312b from the second sub-channel 121b; furthermore, this arrangement can increase the distance between the second fire hole 6 and the adjacent first fire hole 312, thereby avoiding the interference of the flame at the first fire hole 312 with the flame at the second fire hole 6 to cause local high temperature.

[0073] In other embodiments, the rectifying flange portion 32 may also be located on the inner side of the inner shell 1 and fit against the inner wall of the inner shell 1 .

[0074] In one embodiment, both sides of the fire hole plate 31 along the first direction are extended outward with abutting protrusions 33, the ends of the abutting protrusions 33 abut against the inner side wall of the outer shell 2, and a plurality of abutting protrusions 33 are arranged at intervals along the second direction. By providing the abutting protrusions 33, the upper end of the outer shell 2 can be prevented from collapsing inward, and the straightness of the upper end of the outer shell 2 is ensured, so as to facilitate the mixed gas in the second flame channel 5 to flow vertically upward out of the second fire hole 6; at the same time, the provision of a plurality of abutting protrusions 33 is also conducive to dividing the upper end opening of the second flame channel 5 into a plurality of second fire holes 6 along the second direction, so as to realize the grouped combustion of the flame at the second fire hole 6, increase the heat dissipation area of ​​the flame at the second fire hole 6, thereby reducing the flame combustion temperature and reducing the harmful substances generated during the combustion process.

[0075] The abutting protrusion 33 and the rectifying flange portion 32 are staggered in the second direction to simplify the processing of the inner core head 3. In one embodiment, the abutting protrusion 33 is located between two adjacent side fire holes 312b, so that the second fire hole 6 and the side fire hole 312b are arranged one by one in the second direction, thereby ensuring the rich and thin combustion effect of the fire row and improving the combustion stability.

[0076] The abutting protrusion 33 is preferably a trapezoidal structure, and the small end of the trapezoidal structure abuts against the inner wall of the outer shell 2. This structural setting of the abutting protrusion 33 can increase the overall structural strength of the abutting protrusion 33 while adapting the small end size of the abutting protrusion 33 to the width of the connecting bridge portion 23, reduce the probability of deformation of the abutting protrusion 33, and improve the structural stability of the fire bar.

[0077] In one embodiment, a connecting bridge 23 is connected between the top ends of the two outer half shells 21, and a plurality of connecting bridges 23 are arranged at intervals along the second direction, and the connecting bridges 23 are located above the inner shell 1 and the inner core head 3, so that the outer shell 2 is connected to form an integral structure. Each connecting bridge 23 is located directly above an abutting protrusion 33, so that the flame corresponding to the second flame channel 5 is separated only by the abutting protrusion 33, and no longer separated by the connecting bridge 23, thereby improving the consistency of the flame separation at the second flame channel 5.

[0078] like Figure 2 and Figure 3 As shown, in one embodiment, the fire hole plate 31 includes two fire hole sub-plates 311 arranged side by side and at intervals along the first direction, a middle fire hole 312a is formed between the two fire hole sub-plates 311, and each fire hole sub-plate 311 is provided with a plurality of side fire holes 312b at intervals along the second direction, and the upper end of each fire hole sub-plate 311 is bent and connected to the upper end of the rectifying plate portion 41 on the same side. That is, one fire hole sub-plate 311 is bent and formed integrally with one rectifying plate portion 41, and the other fire hole sub-plate 311 is bent and formed with the other rectifying plate portion 41, thereby simplifying the processing of the fire hole plate 31 and the rectifying inner core 4, and simplifying the connection between the rectifying plate portion 41 and the fire hole plate 31, and reducing the processing difficulty of the fire row. Furthermore, each fire hole sub-plate 311 has a rectifying flange portion 32 bent downward at one end away from the other fire hole sub-plate 311.

[0079] The side fire holes 312b on the two fire hole sub-plates 311 are arranged one by one in the second direction to ensure the stability of flame combustion. In one embodiment, the two inner half shells 11 are symmetrically arranged relative to a symmetry plane, and the two fire hole sub-plates 311 and the rectifying inner core 4 are symmetrically arranged relative to the symmetry plane. This arrangement makes the shapes of the two second sub-flow channels 121b roughly consistent, and the side fire holes 312b on the two fire hole sub-plates 311 can be symmetrically arranged, which can effectively ensure the rectification effect and the stability of combustion.

[0080] In one embodiment, the middle fire hole 312a is a long hole extending along the second direction to both sides of the inner shell 1, so as to facilitate the natural shaping of the middle fire hole 312a, and the side fire hole 312b is a rectangular long hole extending along the second direction, so as to facilitate the processing of the side fire hole 312b. In other embodiments, the side fire hole 312b may also be a circular hole, an elliptical hole or a fire hole of other shapes, which is not limited in this embodiment.

[0081] like Figure 3 and Figure 4As shown, in this embodiment, the two ends of the two rectifying plate portions 41 along the second direction are pressed or bent to form an end connection portion 44, and the two end connection portions 44 are sandwiched between the corresponding ends of the two inner half shells 11, that is, the two ends of the rectifying inner core 4 along the second direction are sandwiched between the corresponding ends of the two inner half shells 11. That is, the rectifying inner core 4 is formed by stamping and bending two single sheets of plate materials, with a simple structure and good processing convenience, which is more conducive to ensuring the shape accuracy of the first sub-flow channel 121a and the two first sub-flow channels 121a outside the rectifying inner core 4.

[0082] In one embodiment, the upper ends of the two rectifying plate portions 41 are pressed in a direction toward each other to form rectifying profiles 42, and the rectifying profiles 42 on the two rectifying plate portions 41 are arranged opposite to each other and offset each other. The arrangement of the rectifying profile 42 can change the flow direction and flow velocity of the mixed gas when it flows through the rectifying profile 42, thereby slowing down the flow velocity of the mixed gas flowing out of the first sub-flow channel 121a, and further avoiding flameout; at the same time, the arrangement of the rectifying profile 42 is also conducive to ensuring the consistency of the width of the first sub-flow channel 121a at various locations, avoiding the rectifying plate portion 41 from partially sinking inward and affecting the dimensional accuracy of the first sub-flow channel 121a, avoiding the dimensional deviation of the first sub-flow channel 121a, and improving the combustion stability of the flame at the middle fire hole 312a; further, the arrangement of the rectifying profile 42 can also increase the overall structural strength and rigidity of the rectifying inner core 4, reduce the probability of deformation of the rectifying plate portion 41, and further ensure the shape stability of each sub-flow channel 121.

[0083] The plurality of rectifying profiles 42 are divided into a first profile 42a and a second profile 42b, which are staggered in the second direction, and the first profiles 42a are arranged one by one below the side fire holes 312b, and the second profiles 42bb are located between the two side fire holes 312b. The first profile 42a is a long strip structure extending in the vertical direction, and the second profile 42b is a circular structure.

[0084] Embodiment 2

[0085] This embodiment provides a fire bar, and the fire bar provided in this embodiment has a structure that is basically the same as that in the first embodiment, with only some differences in settings. This embodiment will not repeat the structure that is the same as that in the first embodiment.

[0086] like Figures 5 to 8 As shown, in the present embodiment, the inner core head 3 and the rectifying inner core 4 are separately arranged, that is, in the present embodiment, the fire hole plate 31 is an integral structure, and the fire hole plate 31 and the two rectifying flange parts 32 are integrally formed, thereby making the inner core head 3 and the rectifying inner core 4 separately processed, which is beneficial to simplify the processing of the rectifying inner core 4 and to control the shape and size of the middle fire hole 312a.

[0087] There are multiple middle fire holes 312a and side fire holes 312b spaced apart along the second direction, and the middle fire holes 312a and the side fire holes 312b are arranged one-to-one in the second direction, so that the flames at the middle fire holes 312a burn in groups, increasing the heat dissipation area during flame combustion, avoiding local high temperatures, and thus reducing the generation of nitrogen oxides during the combustion process.

[0088] In this embodiment, the upper ends of the two rectifying plate portions 41 are pressed to form a diverter pressure profile 43 in a direction toward each other, the diverter pressure profiles 43 arranged opposite to each other in the first direction abut against each other, and a plurality of diverter pressure profiles 43 are arranged at intervals along the second direction of the rectifying plate portion 41. In the second direction, each diverter pressure profile 43 is located between two adjacent middle fire holes 312a.

[0089] The setting of the splitter pressure profile 43 can guide the mixed gas flowing through the splitter pressure profile 43 to flow to the middle fire holes 312a on both sides, avoiding the mixed gas from colliding with the fire hole plate 31 located between the two middle fire holes 312a, improving the stability and smoothness of the mixed gas flowing out of the middle fire holes 312a, and further improving the stability of flame combustion.

[0090] Embodiment 3

[0091] This embodiment provides a fire bar, and the fire bar provided in this embodiment has a structure that is basically the same as that in the second embodiment, with only some differences in settings. This embodiment will not repeat the structure that is the same as that in the first embodiment.

[0092] like Fig. 9 As shown, the fire hole plate 31 is in a V-shaped structure, that is, the fire hole plate 31 includes two fire hole sub-plates 311 arranged in a V-shape, each fire hole sub-plate 311 is provided with a plurality of side fire holes 312b spaced apart along the second direction, and a middle fire hole 312a is provided between the two fire hole sub-plates 311. This arrangement enables the flames at the side fire holes 312b on both sides to cross and collide with each other, further improving the flame stability at the side fire holes 312b and improving the flame combustion sufficiency at the side fire holes 312b.

[0093] In this embodiment, two fire hole sub-plates 311 are connected, and a middle fire hole 312a is provided at the connection of the fire hole sub-plates 311. A plurality of middle fire holes 312a are provided at intervals along the second direction. That is, the inner core head 3 and the rectifying inner core 4 are provided separately.

[0094] In other embodiments, each fire hole sub-plate 311 can be bent and connected to the upper end of the rectifying plate portion 41 on the same side, and the lower ends of the two fire hole sub-plates 311 are opposite and spaced apart to form a middle fire hole 312a between the lower ends of the two fire hole sub-plates 311.

[0095] In this embodiment, the angle between the two fire hole sub-plates 311 is 130° to 170°.

[0096] Embodiment 4

[0097] This embodiment provides a fire bar, and the fire bar provided in this embodiment has a structure that is basically the same as that in the second embodiment, with only some differences in settings. This embodiment will not repeat the structure that is the same as that in the first embodiment.

[0098] like Fig.10 As shown, in this embodiment, the rectifying flange portion 32 is located on the inner side of the inner shell 1, and the rectifying flange portion 32 is in contact with the inner wall of the inner shell 1, and the rectifying flange portion 32 is vertically arranged.

[0099] This arrangement enables the rectifying flange portion 32 to rectify the mixed gas flowing upward from the second sub-flow channel 121b out of the side fire hole 312b, ensuring that the mixed gas can flow vertically upward, avoiding interference between the flames at adjacent fire holes and causing local high temperatures, ensuring flame combustion stability, and reducing nitrogen oxides generated during the combustion process. At the same time, this arrangement can prop open the upper end of the inner shell 1, so that the upper end of the inner shell 1 is shaped by the rectifying plate portion 41, reducing the probability of the upper end of the inner shell 1 collapsing inward, ensuring the verticality of the upper end of the inner shell 1, and thus ensuring the shape consistency and stability of the upper end of the second flame channel 5.

[0100] Embodiment 5

[0101] This embodiment provides a fire bar, and the fire bar provided in this embodiment is a further improvement on the fire bar structure in the first embodiment. This embodiment will not repeat the same contents as the first embodiment.

[0102] like Fig.11 As shown, in this embodiment, the lower end of the rectifying plate portion 41 is bent upward to form a reinforcing flange portion 34, and the reinforcing flange portion 34 is in contact with a side of the rectifying plate portion 41 away from the inner shell 1. The upper end of the reinforcing flange portion 34 is flush with the upper end of the fire hole plate 31.

[0103] Strengthening the setting of the flange portion 34 can increase the distance between the second fire hole 6 and the side fire hole 312b, thereby preventing the flame at the second fire hole 6 from interfering with the flame at the adjacent first fire hole 312 and generating local high temperature, ensuring that the flame at the second fire hole 6 is separated from the flame at the adjacent first fire hole 312, ensuring combustion stability and reducing the generation of nitrogen oxides during combustion; at the same time, strengthening the setting of the flange portion 34 narrows the channel width at the upper end of the second flame channel 5, which is conducive to appropriately increasing the flow rate of the mixed gas flowing out of the second fire hole 6; furthermore, strengthening the setting of the flange portion 34 can increase the overall structural strength and rigidity of the inner core head 3, thereby better ensuring the shape accuracy of the inner core head 3, which is conducive to ensuring the verticality of the second sub-channel 121b and the upper end of the second flame channel 5.

[0104] In this embodiment, the inner core head 3 and the rectifying inner core 4 are provided separately, that is, the fire hole plate 31 is an integral structure.

[0105] In other embodiments, the fire hole plate 31 may include fire hole sub-plates 311 arranged side by side in the first direction, and the fire hole sub-plates 311 are integrally bent with the rectifying plate portion 41 on the same side. That is, the reinforcing flange portion 34, the rectifying flange portion 32, the fire hole sub-plates 311 and the rectifying plate portion 41 on the same side are integrally bent.

[0106] Embodiment 6

[0107] This embodiment also provides a burner, including the fire grate in any of the above embodiments. By adopting the above fire grate, the combustion sufficiency and stability of the burner can be improved, the nitrogen oxides generated during the combustion process can be reduced, and the structure of the burner can be simplified, reducing the processing cost of the burner.

[0108] This embodiment also provides a gas heating device, including the above-mentioned burner. By adopting the above-mentioned burner, the operation stability and reliability of the gas heating device can be improved, the harmful gas generated during the operation of the gas heating device can be reduced, and the cost of the gas heating device can be reduced.

[0109] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The specific contents of the above specific implementations only express several implementations of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A fire grate, characterized in that: include: An inner shell (1) has an introduction channel (13) and a first flame channel (12) inside, wherein the lower end of the first flame channel (12) is connected to the introduction channel (13), and the upper end of the first flame channel (12) is open; The inner core head (3) comprises a fire hole plate (31) covering the upper open end of the first flame channel (12), wherein the fire hole plate (31) is provided with at least three first fire holes (312) along a first direction, wherein the first direction is the width direction of the fire row; A rectifying inner core (4) is vertically inserted into the first flame channel (12) and is spaced apart from the two side walls of the inner shell (1) in the first direction. The rectifying inner core (4) divides the upper part of the first flame channel (12) into a plurality of sub-channels (121) along the first direction. The sub-channels (121) and the first fire holes (312) are arranged in a one-to-one correspondence in the first direction. The upper end of each sub-channel (121) is connected to the corresponding first fire hole (312).

2. The fire bar according to claim 1, characterized in that: The rectifying inner core (4) comprises two rectifying plate portions (41) arranged opposite to each other and spaced apart in the first direction, the rectifying plate portions (41) being arranged vertically, the plurality of sub-flow channels (121) comprising a first sub-flow channel (121a) located between the two rectifying plate portions (41) and two second sub-flow channels (121b) located on both sides of the rectifying inner core (4), the first fire hole (312) corresponding to the first sub-flow channel (121a) being a middle fire hole (312a), and the first fire hole (312) corresponding to the second sub-flow channel (121b) being a side fire hole (312b); And / or, the lower end of the rectifying inner core (4) extends to the lower part of the first flame channel (12).

3. The fire bar according to claim 2, characterized in that: The size of the middle fire hole (312a) in the first direction is 0.5 mm to 1.5 mm; and / or, the size of the side fire hole (312b) in the first direction is 0.7 mm to 2 mm; And / or, the ratio of the size of the side fire hole (312b) in the first direction to the size of the middle fire hole (312a) in the first direction is 1.2 to 1.

5.

4. The fire bar according to claim 2, characterized in that: The fire hole plate (31) comprises two fire hole sub-plates (311) arranged side by side and at intervals along the first direction, each of the fire hole sub-plates (311) is integrally bent and connected to the upper end of the rectifying plate portion (41) on the same side, the middle fire hole (312a) is formed between the two fire hole sub-plates (311), and each of the fire hole sub-plates (311) is provided with the side fire hole (312b); Alternatively, the fire hole plate (31) is integrally formed and abuts against the upper end of the rectifying inner core (4).

5. The fire bar according to claim 2, characterized in that: The fire hole plate (31) comprises two fire hole sub-plates (311) arranged in a V shape, each of the fire hole sub-plates (311) is provided with the side fire hole (312b), and the middle fire hole (312a) is provided between the two fire hole sub-plates (311).

6. The fire bar according to any one of claims 1 to 5, characterized in that: The fire hole plate (31) has rectifying flange portions (32) extending downwardly on both sides along the first direction, and the rectifying flange portions (32) are arranged vertically and fit with the outer side wall or the inner side wall of the inner shell (1).

7. The fire bar according to claim 6, characterized in that: The rectifying flange portion (32) is fitted with the outer wall of the inner shell (1), and the lower end of the rectifying flange portion (32) is folded upward to form a reinforcing flange portion (34), and the reinforcing flange portion (34) is fitted with a side surface of the rectifying flange portion (32) facing away from the inner shell (1).

8. The fire bar according to any one of claims 1 to 5, characterized in that: The fire bar further comprises an outer shell (2), the outer shell (2) being sleeved on the outer side of the inner shell (1) and being surrounded by the outer side wall of the inner shell (1) to form a second flame channel (5), the lower end of the second flame channel (5) being connected to the injection channel (13), the upper end of the second flame channel (5) being open to form a second flame hole (6), one of the second flame hole (6) and the first flame hole (312) being a light flame hole, and the other being a strong flame hole; The ejection channel (13) comprises a first ejection channel (13a) and a second ejection channel (13b) which are separated from each other, the lower end of the first flame channel (12) is connected to the first ejection channel (13a), the second flame channel (5) is connected to the second ejection channel (13b), the first ejection channel (13a) and the second ejection channel (13b) eject mixed gases with different air-fuel ratios; and / or, both sides of the fire hole plate (31) along the first direction are provided with abutment protrusions (33) extending outwards, the ends of the abutment protrusions (33) abut against the inner side wall of the outer shell (2), and a plurality of abutment protrusions (33) are arranged at intervals along the second direction, the second direction being the length direction of the fire row.

9. A burner, characterized in that: Comprising the fire grate as described in any one of claims 1-8.

10. A gas heating device, characterized in that: Comprising the burner as claimed in claim 9.

Images