Combustor with low nitrogen oxide emission and working method thereof

Abstract

The invention relates to a combustor with low nitrogen oxide emission and a working method thereof, and belongs to the field of kitchen appliances. The burner comprises an outer-ring burner cap, an inner-ring burner cap, a combustion chamber, an ejector, an ignition needle and a thermocouple, the combustion chamber, the ignition needle and the thermocouple are all installed on the ejector, and the outer-ring burner cap and the inner-ring burner cap are both installed on the combustion chamber, and is structurally characterized in that the outer-ring burner cap comprises an outer-ring burner cap top ring and an outer-ring burner cap bottom ring; main fire holes and fire stabilizing holes are formed in the outer-ring fire cover top ring, the diameter of the outer-ring fire cover top ring is smaller than that of the outer-ring fire cover bottom ring, and the outer-ring fire cover top ring and the outer-ring fire cover bottom ring are of an integrated structure and are of a step-shaped structure. A secondary air shunting annular groove is formed between the side wall of the outer ring fire cover top ring and the top wall of the outer ring fire cover bottom ring, the combustion chamber is arranged in a center hole of the energy gathering plate pot support, and a secondary air supplementing annular channel is formed between the side wall of the combustion chamber and the side wall of the center hole.

Description

Technical Field

[0001] The invention relates to a burner with low nitrogen oxide emission and a working method thereof, belonging to the field of kitchen appliances. Background Art

[0002] The secondary air supplement annular channel formed between the conventional burner and the energy-gathering pan support is located at the root of the Bunsen flame (such as Figure 1 As shown). That is to say, the outer wall of the outer ring fire cover is arranged vertically without a stepped structure, so that all the secondary air participating in the combustion starts from the root of the Bunsen flame to the middle and the top, and 79% of the nitrogen in the secondary air enters the high-temperature flue gas for a long distance, participates in the high-temperature reaction for a long time, and produces a high content of nitrogen oxides. In view of this, a high heat load and high thermal efficiency burner is disclosed in the patent document with application number 201911127178.1.

[0003] The burner needs to be used in conjunction with the energy-gathering disk pot support. The energy-gathering disk and the pot support are important parts of the gas stove and are used to support the pot body. The energy-gathering disk is used to gather heat energy. In view of this, a three-layer energy-gathering disk pot support with a heat-insulating function is disclosed in the patent document with application number 202323394223.4. The top-layer support 1 and the bottom-layer support 3 in the above-mentioned prior art are in full contact with each other, and no heat-insulating groove 39 is provided. This will cause the heat to be transferred from the top-layer support 1 to the bottom-layer support 3 during heating, resulting in a large heat loss. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a burner with low nitrogen oxide emissions and a working method thereof with a rationally designed structure.

[0005] The technical solution adopted by the present invention to solve the above-mentioned problem is: the burner with low nitrogen oxide emissions includes an outer ring fire cover, an inner ring fire cover, a combustion chamber, an ejector, an ignition needle and a thermocouple, the combustion chamber, the ignition needle and the thermocouple are all installed on the ejector, the outer ring fire cover and the inner ring fire cover are both installed on the combustion chamber, and its structural characteristics are: the outer ring fire cover includes an outer ring fire cover top ring and an outer ring fire cover bottom ring, the outer ring fire cover top ring is provided with a main fire hole and a stabilizing fire hole, the diameter of the outer ring fire cover top ring is smaller than the diameter of the outer ring fire cover bottom ring, the outer ring fire cover top ring and the outer ring fire cover bottom ring are an integrated structure, and are arranged in a stepped structure.

[0006] Furthermore, a secondary air diversion annular groove is formed between the side wall of the outer ring fire cover top ring and the top wall of the outer ring fire cover bottom ring.

[0007] Furthermore, the combustion chamber is arranged in the central hole of the energy-gathering pan support, and a secondary air supplement annular channel is formed between the side wall of the combustion chamber and the side wall of the central hole.

[0008] Furthermore, the energy-gathering pan support includes a top support, an insulating support and a bottom support, and the top support, insulating support and bottom support are arranged in sequence from top to bottom, and the top support and insulating support are both arranged on the bottom support, and a top insulating cavity is formed between the top support and the insulating support, and a bottom insulating cavity is formed between the insulating support and the bottom support.

[0009] Furthermore, a heat-insulating boss is provided on the top of the bottom bracket, and the top bracket contacts the heat-insulating boss, so that a heat-insulating groove is formed between the top bracket and the bottom bracket.

[0010] Furthermore, a limiting column is arranged at the bottom of the bottom bracket, a limiting plate is arranged on the limiting column, a limiting groove is formed between the limiting plate and the limiting column, and a rubber pad is arranged on the limiting column.

[0011] Furthermore, a support leg is welded on the top bracket, a fastening nut is welded on the support leg, a ground foot is fixed on the bottom bracket, a fastening screw is installed on the bottom bracket, and the fastening screw is connected to the fastening nut.

[0012] Furthermore, the thermal insulation bracket is provided with a support leg hole, and the support leg penetrates the support leg hole.

[0013] Furthermore, a support column is fixed on the bottom bracket, and the heat insulation bracket is installed on the support column by means of support screws.

[0014] Furthermore, the heat-insulating groove is connected to the top-layer heat-insulating cavity and the bottom-layer heat-insulating cavity.

[0015] Furthermore, the foot is placed on the stove panel.

[0016] Furthermore, the limiting groove is clamped with the water receiving tray, and the rubber pad is in contact with the water receiving tray.

[0017] Furthermore, another technical purpose of the present invention is to provide a method for operating a burner with low nitrogen oxide emissions.

[0018] The above technical objectives of the present invention are achieved through the following technical solutions.

[0019] A working method for a burner with low nitrogen oxide emission is characterized in that: according to the shape of the Bunsen flame, that is, the thickness of the transparent layer with the highest flame temperature gradually increases at the root, middle and top of the flame, it can be seen that the amount of secondary air participating in the combustion is the largest at the top of the Bunsen flame, followed by the middle, and the least at the root; therefore, the secondary air can be directly supplemented to the middle and top of the Bunsen flame above, with the shortest supplement distance and the shortest time for the secondary air to participate in high-temperature combustion; since the nitrogen content in the air reaches 79%, the shorter the time that a large amount of nitrogen is in the high-temperature flue gas as high as 900°C, the less the nitrogen oxide content generated by the high-temperature reaction.

[0020] Furthermore, the top ring of the outer ring fire cover and the bottom ring of the outer ring fire cover form a stepped structure and form a secondary air diversion annular groove. The horizontal distance of the secondary air diversion annular groove is H. By forming the secondary air diversion annular groove, a secondary air supplement annular channel can be formed between the side wall of the combustion chamber and the side wall of the center hole and is located directly below the Bunsen flame.

[0021] Compared with the prior art, the present invention has the following advantages: the outer ring fire cover of the burner can be arranged in a stepped structure by the outer ring fire cover top ring and the outer ring fire cover bottom ring, that is, a secondary air diversion annular groove is formed between the side wall of the outer ring fire cover top ring and the top wall of the outer ring fire cover bottom ring, so that the secondary air supplement annular channel can be located directly below the Bunsen flame; so that the secondary air can be directly supplemented to the middle and top of the Bunsen flame above, the supplement distance is shortest, and the time for the secondary air to participate in high-temperature combustion is shortest.

[0022] By arranging a heat-insulating boss on the top of the bottom bracket, the top bracket can be in contact with the heat-insulating boss, thereby forming a heat-insulating groove between the top bracket and the bottom bracket, so as to avoid excessive heat loss caused by heat transfer to the bottom bracket during heating; at the same time, by arranging a limit column and a limit plate at the bottom of the bottom bracket to form a limit groove, the limit groove can be connected with the water receiving tray to limit the pot bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the burner in use state in the prior art.

[0024] Figure 2 It is a schematic diagram of the burner in use state according to an embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the structure of the Bunsen flame.

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of a burner according to an embodiment of the present invention.

[0027] Figure 5It is a schematic diagram of the three-dimensional structure of a burner according to an embodiment of the present invention.

[0028] Figure 6 It is a schematic diagram of the burner in use state according to an embodiment of the present invention.

[0029] Figure 7 It is a schematic diagram of the exploded structure of the energy-gathering pan support according to an embodiment of the present invention.

[0030] Figure 8 It is a schematic diagram of the three-dimensional structure of the energy-gathering pan support according to an embodiment of the present invention.

[0031] Fig. 9 It is a schematic diagram of the three-dimensional structure of the energy-gathering pan support according to an embodiment of the present invention.

[0032] Fig.10 It is a schematic diagram of the cross-sectional structure of the energy-gathering pan support according to an embodiment of the present invention.

[0033] Fig.11 It is a schematic diagram of the cross-sectional structure of the energy-gathering pan support according to an embodiment of the present invention.

[0034] Fig.12 It is a schematic diagram of the structure of the energy-gathering pan support in use according to an embodiment of the present invention.

[0035] In the figure: outer ring fire cover 1, inner ring fire cover 2, combustion chamber 3, ejector 4, ignition needle 5, thermocouple 6, energy-gathering pan support 7, stove panel 8, secondary air supplement annular channel 9, water receiving tray 10, Outer ring fire cover top ring 11, outer ring fire cover bottom ring 12, secondary air diversion ring groove 13, main fire hole 14, stable fire hole 15, Top bracket 71, heat insulation bracket 72, bottom bracket 73, top insulation cavity 74, bottom insulation cavity 75, Support foot 711, fastening nut 712, Support foot hole 721, support screw 722, The base 731 , the support column 732 , the fastening screw 733 , the limiting column 734 , the limiting plate 735 , the limiting groove 736 , the rubber pad 737 , the heat-insulating boss 738 , and the heat-insulating through groove 739 . DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0037] Example.

[0038] See also Figure 2 , 4 to Fig.12As shown, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, if there are references to terms such as "upper", "lower", "left", "right", "middle" and "one" in this specification, they are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0039] The low nitrogen oxide emission burner in this embodiment includes an outer ring fire cover 1, an inner ring fire cover 2, a combustion chamber 3, an ejector 4, an ignition needle 5 and a thermocouple 6. The combustion chamber 3, the ignition needle 5 and the thermocouple 6 are all installed on the ejector 4, and the outer ring fire cover 1 and the inner ring fire cover 2 are both installed on the combustion chamber 3.

[0040] The outer ring fire cover 1 in this embodiment includes an outer ring fire cover top ring 11 and an outer ring fire cover bottom ring 12. The outer ring fire cover top ring 11 is provided with a main fire hole 14 and a stabilizing fire hole 15. The diameter of the outer ring fire cover top ring 11 is smaller than the diameter of the outer ring fire cover bottom ring 12. The outer ring fire cover top ring 11 and the outer ring fire cover bottom ring 12 are an integrated structure and are arranged in a stepped structure. A secondary air diversion annular groove 13 is formed between the side wall of the outer ring fire cover top ring 11 and the top wall of the outer ring fire cover bottom ring 12. The combustion chamber 3 is arranged in the central hole of the energy-gathering disc pot bracket 7, and a secondary air supplementary annular channel 9 is formed between the side wall of the combustion chamber 3 and the side wall of the central hole. The width of the secondary air diversion annular groove 13 is H, and the value range of H is 10-15mm.

[0041] The energy-gathering pan support 7 in this embodiment includes a top support 71, an insulating support 72 and a bottom support 73. The top support 71, the insulating support 72 and the bottom support 73 are arranged in sequence from top to bottom. The top support 71 and the insulating support 72 are both arranged on the bottom support 73. A top insulating cavity 74 is formed between the top support 71 and the insulating support 72, and a bottom insulating cavity 75 is formed between the insulating support 72 and the bottom support 73.

[0042] The thermal insulation bracket 72 in this embodiment is provided with a support leg hole 721, and the support leg 711 passes through the support leg hole 721. A thermal insulation boss 738 is provided on the top of the bottom bracket 73. The top bracket 71 contacts the thermal insulation boss 738 to form a thermal insulation groove 739 between the top bracket 71 and the bottom bracket 73. A support column 732 is fixed to the bottom bracket 73. The thermal insulation bracket 72 is installed on the support column 732 by a support screw 722. The thermal insulation groove 739 is connected to the top thermal insulation cavity 74 and the bottom thermal insulation cavity 75.

[0043] A limiting column 734 is provided at the bottom of the bottom bracket 73 in this embodiment, a limiting plate 735 is provided on the limiting column 734, a limiting groove 736 is formed between the limiting plate 735 and the limiting column 734, a rubber pad 737 is provided on the limiting column 734, the limiting groove 736 is clamped with the water receiving tray 10, and the rubber pad 737 is in contact with the water receiving tray 10.

[0044] In this embodiment, a support leg 711 is welded on the top bracket 71, a fastening nut 712 is welded on the support leg 711, a ground foot 731 is fixed on the bottom bracket 73, a fastening screw 733 is installed on the bottom bracket 73, the fastening screw 733 is connected to the fastening nut 712, and the ground foot 731 is placed on the stove panel 8.

[0045] According to the shape of the Bunsen flame, that is, the thickness of the transparent layer with the highest flame temperature gradually increases at the root, middle and top of the flame. It can be seen that the amount of secondary air participating in the combustion is the largest at the top of the Bunsen flame, followed by the middle, and the least at the root; therefore, the secondary air can be directly supplemented to the middle and top of the Bunsen flame above, with the shortest supplement distance and the shortest time for the secondary air to participate in high-temperature combustion; since the nitrogen content in the air reaches 79%, the shorter the time that a large amount of nitrogen is in the high-temperature flue gas as high as 900°C, the less the content of nitrogen oxides generated by the high-temperature reaction.

[0046] The outer ring fire cover top ring 11 and the outer ring fire cover bottom ring 12 form a stepped structure and form a secondary air diversion annular groove 13. The horizontal distance of the secondary air diversion annular groove 13 is H. By forming the secondary air diversion annular groove 13, a secondary air supplement annular channel 9 can be formed between the side wall of the combustion chamber 3 and the side wall of the center hole and is located directly below the Bunsen flame.

[0047] Bunsen flame shape and layering characteristics (such as Figure 3 shown): 1. The innermost flame core is the inner cone layer, with a temperature of about 300°C; 2. The light blue part in the middle of the flame is the outer cone, with a temperature of about 500°C; 3. The outermost lavender layer of the flame is the transparent layer (oxidation flame layer), with a temperature of about 800-900°C.

[0048] The energy-gathering pan support 7 is composed of a top support 71, an insulating support 72, and a bottom support 73. The insulating support 72 is completely vacant and has no contact with the periphery of the top support 71 and the bottom support 73. It is supported only by four support columns 732 at the bottom and locked with four support screws 722. A top insulating cavity 74 is formed between the top support 71 and the insulating support 72, and a bottom insulating cavity 75 is formed between the insulating support 72 and the bottom support 73.

[0049] At the same time, a heat insulating boss 738 is arranged on the top of the bottom bracket 73. The heat insulating boss 738 can support the top bracket 71 and form a heat insulating groove 739 between the top bracket 71 and the bottom bracket 73, thereby avoiding complete contact between the top bracket 71 and the bottom bracket 73, avoiding heat transfer to the bottom bracket 73 to cause heat loss, and at the same time, the heat insulating groove 739 is connected with the top insulation cavity 74 and the bottom insulation cavity 75.

[0050] The edge of the top bracket 71 contacts the insulation boss 738 of the bottom bracket 73, and the inner edge has no contact to reduce the contact area. The insulation bracket 72 is arranged between the top bracket 71 and the bottom bracket 73 to prevent the top bracket 71 from radiating heat and transferring heat downward, so that the surface temperature of the top bracket 71 is higher than the upper surface temperature of the double-layer energy-gathering plate in the prior art, which can further improve the thermal efficiency of the household gas stove.

[0051] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A burner with low nitrogen oxide emission, comprising an outer ring fire cover (1), an inner ring fire cover (2), a combustion chamber (3), an ejector (4), an ignition needle (5) and a thermocouple (6), wherein the combustion chamber (3), the ignition needle (5) and the thermocouple (6) are all mounted on the ejector (4), and the outer ring fire cover (1) and the inner ring fire cover (2) are both mounted on the combustion chamber (3), characterized in that: The outer ring fire cover (1) comprises an outer ring fire cover top ring (11) and an outer ring fire cover bottom ring (12), the outer ring fire cover top ring (11) is provided with a main fire hole (14) and a fire stabilization hole (15), the diameter of the outer ring fire cover top ring (11) is smaller than the diameter of the outer ring fire cover bottom ring (12), the outer ring fire cover top ring (11) and the outer ring fire cover bottom ring (12) are an integrated structure and are arranged in a stepped structure, a secondary air diversion annular groove (13) is formed between the side wall of the outer ring fire cover top ring (11) and the top wall of the outer ring fire cover bottom ring (12), and when the combustion chamber (3) is arranged in the center hole of the energy-gathering pan support (7), a secondary air supplement annular channel (9) is formed between the side wall of the combustion chamber (3) and the side wall of the center hole.

2. The burner with low nitrogen oxide emission according to claim 1, characterized in that: The energy-gathering pan support (7) comprises a top support (71), a heat-insulating support (72) and a bottom support (73); the top support (71), the heat-insulating support (72) and the bottom support (73) are arranged in sequence from top to bottom; the top support (71) and the heat-insulating support (72) are both arranged on the bottom support (73); a top heat-insulating cavity (74) is formed between the top support (71) and the heat-insulating support (72); and a bottom heat-insulating cavity (75) is formed between the heat-insulating support (72) and the bottom support (73).

3. The burner with low nitrogen oxide emission according to claim 2, characterized in that: A heat-insulating boss (738) is provided on the top of the bottom bracket (73), and the top bracket (71) is in contact with the heat-insulating boss (738), so that a heat-insulating groove (739) is formed between the top bracket (71) and the bottom bracket (73).

4. The burner with low nitrogen oxide emission according to claim 2, characterized in that: A limiting column (734) is arranged at the bottom of the bottom bracket (73), a limiting plate (735) is arranged on the limiting column (734), a limiting groove (736) is formed between the limiting plate (735) and the limiting column (734), and a rubber pad (737) is arranged on the limiting column (734).

5. The burner with low nitrogen oxide emission according to claim 2, characterized in that: A support foot (711) is welded to the top bracket (71), a fastening nut (712) is welded to the support foot (711), a ground foot (731) is fixed to the bottom bracket (73), a fastening screw (733) is installed on the bottom bracket (73), and the fastening screw (733) is connected to the fastening nut (712).

6. The burner with low nitrogen oxide emission according to claim 2, characterized in that: The heat insulation bracket (72) is provided with a support leg hole (721), and the support leg (711) and the support leg hole (721) penetrate each other.

7. The burner with low nitrogen oxide emission according to claim 2, characterized in that: A support column (732) is fixed on the bottom bracket (73), and the heat insulation bracket (72) is mounted on the support column (732) via a support screw (722).

8. The burner with low nitrogen oxide emission according to claim 5, characterized in that: The heat-insulating groove (739) is in communication with the top heat-insulating cavity (74) and the bottom heat-insulating cavity (75).

9. A method for operating a burner with low nitrogen oxide emissions according to any one of claims 1 to 8, characterized in that: According to the shape of the Bunsen flame, that is, the thickness of the transparent layer with the highest flame temperature gradually increases at the root, middle and top of the flame. It can be seen that the amount of secondary air participating in the combustion is the largest at the top of the Bunsen flame, followed by the middle, and the least at the root; therefore, the secondary air can be directly supplemented to the middle and top of the Bunsen flame above, with the shortest supplement distance and the shortest time for the secondary air to participate in high-temperature combustion; since the nitrogen content in the air reaches 79%, the shorter the time that a large amount of nitrogen is in the high-temperature flue gas as high as 900°C, the less the content of nitrogen oxides generated by the high-temperature reaction.

10. The operating method of a burner with low nitrogen oxide emissions according to claim 9, characterized in that: The outer ring fire cover top ring (11) and the outer ring fire cover bottom ring (12) form a stepped structure and form a secondary air diversion annular groove (13). The horizontal distance of the secondary air diversion annular groove (13) is H. By forming the secondary air diversion annular groove (13), a secondary air supplementary annular channel (9) can be formed between the side wall of the combustion chamber (3) and the side wall of the central hole, which is located directly below the Bunsen flame.

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