Burner with low nitrogen oxide emission

Abstract

The utility model relates to a burner with low nitrogen oxide emission, 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 utility model relates to a kind of combustor of low nitrogen oxide emission, belong to kitchen appliance field. BACKGROUND

[0002] The secondary air supplement annular channel formed between conventional combustor and energy-gathering disc pot support is located at the root of bunsen flame (as shown in Figure 1 That is, the outer wall of outer ring fire cover is vertically arranged, without setting ladder-shaped structure, so that 79% of nitrogen in secondary air travels long distance in high-temperature flue gas, and the time of participating in high-temperature reaction is long, and the content of nitrogen oxide produced is high. In view of this, a high heat load high heat efficiency combustor is disclosed in the patent document with application number 201911127178.1.

[0003] Combustor needs to be used with energy-gathering disc pot support, and energy-gathering disc and pot support are important parts in gas stove for supporting pot body, and energy-gathering disc is used for gathering heat energy. In view of this, a three-layer energy-gathering disc pot support with heat insulation 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 prior art are in full contact state, and no heat insulation groove 39 is provided, which will make the heat transferred from the top layer support 1 to the bottom layer support 3 during heating, resulting in large heat loss. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the above-mentioned deficiencies in the prior art, and provides a combustor with low nitrogen oxide emission and reasonable structure design.

[0005] The utility model discloses the technical scheme adopted to solve the above problems is as follows: the combustor with low nitrogen oxide emission includes outer ring fire cover, inner ring fire cover, combustion chamber, ejector, ignition needle and thermocouple, the combustion chamber, ignition needle and thermocouple are all installed on the ejector, the outer ring fire cover and inner ring fire cover are all installed on the combustion chamber, and the structural characteristics are that the outer ring fire cover includes outer ring fire cover top ring and outer ring fire cover bottom ring, the outer ring fire cover top ring is provided with main fire hole and fire stabilizing hole, the diameter of the outer ring fire cover top ring is less 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 integrated and arranged in a ladder-shaped structure.

[0006] Further, the secondary air shunt 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] Further, the combustion chamber is arranged in the central hole of energy-gathering disc pot support, and the secondary air supplement annular channel is formed between the side wall of the combustion chamber and the side wall of the central hole.

[0008] Further, the energy focusing disc pot support comprises a top layer support, a heat insulation support and a bottom layer support, the top layer support, the heat insulation support and the bottom layer support are arranged in sequence from top to bottom, the top layer support and the heat insulation support are arranged on the bottom layer support, the top layer support and the heat insulation support form a top layer heat insulation cavity, and the heat insulation support and the bottom layer support form a bottom layer heat insulation cavity.

[0009] Further, the top of the bottom layer support is provided with a heat insulation boss, the top layer support is in contact with the heat insulation boss, so that the heat insulation through groove is formed between the top layer support and the bottom layer support.

[0010] Further, the bottom of the bottom layer support is provided with a limiting column, 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] Further, a supporting leg is welded on the top layer support, a fastening nut is welded on the supporting leg, a foot is fixed on the bottom layer support, a fastening screw is installed on the bottom layer support, and the fastening screw is connected with the fastening nut.

[0012] Further, a supporting leg hole is arranged on the heat insulation support, and the supporting leg penetrates through the supporting leg hole.

[0013] Further, a supporting column is fixed on the bottom layer support, and the heat insulation support is installed on the supporting column through a supporting screw.

[0014] Further, the heat insulation through groove is communicated with the top layer heat insulation cavity and the bottom layer heat insulation cavity.

[0015] Further, the foot is placed on the cooktop panel.

[0016] Further, the limiting groove is clamped with the water pan, and the rubber pad is in contact with the water pan.

[0017] Compared with the prior art, the burner has the following advantages: the outer ring flame cover of the burner is arranged in a stepped structure by arranging the outer ring flame cover top ring and the outer ring flame cover bottom ring, that is, a secondary air shunting ring groove is formed between the side wall of the outer ring flame cover top ring and the top wall of the outer ring flame cover bottom ring, so that the secondary air supplement ring channel is located directly below the primary flame; so that the secondary air can be directly supplemented to the middle and top of the primary flame, the supplement distance is the shortest, and the secondary air participates in high-temperature combustion for the shortest time.

[0018] By setting a heat-insulating boss at the top of the bottom support, the top support can contact the heat-insulating boss, thereby forming a heat-insulating groove between the top support and the bottom support to avoid excessive heat loss caused by heat transfer to the bottom support during the heating process. At the same time, by setting a limiting post and a limiting plate at the bottom of the bottom support to form a limiting groove, the limiting groove can be engaged with the water receiving tray to limit the position of the pot support. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the burner in use in the prior art.

[0020] Figure 2 This is a schematic diagram of the burner in use according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the Bunsen flame.

[0022] Figure 4 This is a cross-sectional structural diagram of the burner according to an embodiment of the present invention.

[0023] Figure 5 This is a three-dimensional structural diagram of the burner according to an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the burner in use according to an embodiment of the present invention.

[0025] Figure 7 This is an exploded structural diagram of the energy-concentrating pot support according to an embodiment of the present invention.

[0026] Figure 8 This is a three-dimensional structural diagram of the energy-concentrating pot support according to an embodiment of the present utility model.

[0027] Figure 9 This is a three-dimensional structural diagram of the energy-concentrating pot support according to an embodiment of the present utility model.

[0028] Figure 10 This is a cross-sectional structural schematic diagram of the energy-concentrating pot support according to an embodiment of the present utility model.

[0029] Figure 11 This is a cross-sectional structural schematic diagram of the energy-concentrating pot support according to an embodiment of the present utility model.

[0030] Figure 12 This is a schematic diagram of the energy-concentrating pot support in use according to an embodiment of this utility model.

[0031] In the diagram: 1. Outer ring burner cap; 2. Inner ring burner cap; 3. Combustion chamber; 4. Ejector; 5. Ignition needle; 6. Thermocouple; 7. Concentrating pot support; 8. Cooktop panel; 9. Secondary air supply annular channel; 10. Water tray.

[0032] outer ring fire cover top ring 11, outer ring fire cover bottom ring 12, secondary air shunt ring groove 13, main fire hole 14, steady fire hole 15,

[0033] top layer support 71, heat insulation support 72, bottom layer support 73, top layer heat insulation cavity 74, bottom layer heat insulation cavity 75,

[0034] leg 711, fastening nut 712,

[0035] leg hole 721, support screw 722,

[0036] foot 731, support column 732, fastening screw 733, limiting column 734, limiting plate 735, limiting groove 736, rubber pad 737, heat insulation boss 738, heat insulation through groove 739. DETAILED DESCRIPTION

[0037] The utility model will be further explained in detail below by combining with the drawings and through examples, the following examples are the explanation of the utility model and the utility model is not limited to the following examples.

[0038] Embodiment

[0039] Referring to Figure 2 , 4 to Figure 12 It is shown that, must know, the structure, proportion, size and the like drawn in the drawing of the present specification, all only use in order to cooperate the content disclosed in the specification, for the person skilled in this technology to understand and read, and not use to limit the limited condition that the utility model can be implemented, therefore not have the substantial meaning in technology, any modification of structure, change of proportion relationship or adjustment of size, under the condition that does not influence the effect that the utility model can produce and the purpose that can be achieved, all should still fall in the range that the technical content disclosed in the utility model can cover. Meanwhile, if there are terms such as "upper", "lower", "left", "right", "intermediate" and "one" in the present specification, only for the clear understanding of the narrative, and not use to limit the range that the utility model can be implemented, the change or adjustment of relative relationship, when no substantial change of technical content, also be regarded as the scope that the utility model can be implemented.

[0040] The low nitrogen oxide emission burner in the 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 all installed on the combustion chamber 3.

[0041] The outer ring fire cover 1 in the embodiment 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 stable 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 in an integrated structure and are arranged in a stepped structure, a secondary air shunt ring 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 support 7, and a secondary air supplement 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 shunt ring groove 13 is H, and the value range of H is 10-15 mm.

[0042] The energy-gathering disc pot support 7 in the embodiment comprises a top layer support 71, a heat insulation support 72 and a bottom layer support 73, the top layer support 71, the heat insulation support 72 and the bottom layer support 73 are arranged in sequence from top to bottom, the top layer support 71 and the heat insulation support 72 are arranged on the bottom layer support 73, a top layer heat insulation cavity 74 is formed between the top layer support 71 and the heat insulation support 72, and a bottom layer heat insulation cavity 75 is formed between the heat insulation support 72 and the bottom layer support 73.

[0043] The heat insulation support 72 in the embodiment is provided with a support leg hole 721, the support leg 711 penetrates through the support leg hole 721, the top of the bottom layer support 73 is provided with a heat insulation boss 738, the top layer support 71 is in contact with the heat insulation boss 738, so that a heat insulation through groove 739 is formed between the top layer support 71 and the bottom layer support 73, the bottom layer support 73 is fixed with a support column 732, the heat insulation support 72 is installed on the support column 732 through a support screw 722, and the heat insulation through groove 739 is in communication with the top layer heat insulation cavity 74 and the bottom layer heat insulation cavity 75.

[0044] The bottom of the bottom layer support 73 in the embodiment is provided with a limiting column 734, the limiting column 734 is provided with a limiting plate 735, a limiting groove 736 is formed between the limiting plate 735 and the limiting column 734, the limiting column 734 is provided with a rubber pad 737, the limiting groove 736 is clamped with the water pan 10, and the rubber pad 737 is in contact with the water pan 10.

[0045] The top layer support 71 in the embodiment is welded with the support leg 711, the support leg 711 is welded with a fastening nut 712, the bottom layer support 73 is fixed with a ground leg 731, the bottom layer support 73 is installed with a fastening screw 733, the fastening screw 733 is connected with the fastening nut 712, and the ground leg 731 is placed on the stove panel 8.

[0046] According to the Bunsen flame shape, that is, the thickness of the transparent layer with the highest flame temperature is gradually increased at the root, middle and top of the flame, it can be seen that the amount of secondary air participating in combustion is the most at the top of the Bunsen flame, the second at 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, the shortest distance of supplement, and the shortest time of secondary air participating in high-temperature combustion; since the nitrogen content in air reaches 79%, the shorter the time of a large amount of nitrogen in the high-temperature flue gas at 900°C, the less the content of nitrogen oxides generated by high-temperature reaction.

[0047] 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 shunt ring groove 13, and the horizontal distance of the secondary air shunt ring groove 13 is H, and by forming the secondary air shunt ring groove 13, the secondary air supplement annular channel 9 between the side wall of the combustion chamber 3 and the side wall of the center hole is located directly below the Bunsen flame.

[0048] The Bunsen flame shape and the layered characteristics (as shown in Figure 3 ):

[0049] 1. The innermost flame core of the flame is the inner cone layer, and the temperature is about 300°C;

[0050] 2. The light blue part in the middle of the flame is the outer cone layer, and the temperature is about 500°C;

[0051] 3. The outermost light purple of the flame is the transparent layer (oxidizing flame layer), and the temperature is about 800-900°C.

[0052] The energy-gathering disc pot support 7 is composed of a top layer support 71, a heat insulation support 72 and a bottom layer support 73. The heat insulation support 72 is completely empty, and has no contact with the periphery of the top layer support 71 and the bottom layer support 73, and is only supported at the bottom by four support columns 732 and locked by four support screws 722. A top layer heat insulation cavity 74 is formed between the top layer support 71 and the heat insulation support 72, and a bottom layer heat insulation cavity 75 is formed between the heat insulation support 72 and the bottom layer support 73.

[0053] Meanwhile, a heat insulation boss 738 is arranged on the top of the bottom layer support 73, which can support the top layer support 71 and form a heat insulation through groove 739 between the top layer support 71 and the bottom layer support 73, so as to avoid the complete contact between the top layer support 71 and the bottom layer support 73 and the heat transfer to the bottom layer support 73 to cause heat loss. Meanwhile, the heat insulation through groove 739 is in communication with the top layer heat insulation cavity 74 and the bottom layer heat insulation cavity 75.

[0054] The edge of the top layer support 71 is in contact with the heat insulation boss 738 of the bottom layer support 73, and the inner edge is free of any contact, so as to reduce the contact area, and the arrangement of the heat insulation support 72 between the top layer support 71 and the bottom layer support 73 can prevent the top layer support 71 from downward heat radiation and heat transfer, so that the surface temperature of the top layer support 71 is higher than the upper layer surface temperature of the double layer energy collecting disc in the prior art, and the thermal efficiency of the household gas stove can be further improved.

[0055] In addition, it should be noted that the specific embodiments described in the specification, the shape of the zero, the components, the name taken, etc. can be different, and the above described in the specification is only an example of the structure of the utility model. Any equivalent change or simple change made according to the structure, features and principles described in the utility model patent concept is included in the protection scope of the utility model patent. The skilled in the art of the utility model can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as it does not deviate from the structure of the utility model or exceed the range defined in the claims, which shall belong to the protection scope of the utility model.

Claims

1. A low nitrogen oxide emission burner comprising an outer ring flame cap (1), an inner ring flame cap (2), a combustion chamber (3), an injector (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 injector (4), the outer ring flame cap (1) and the inner ring flame cap (2) are both installed 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 stable fire hole (15), the diameter of the outer ring fire cover top ring (11) is smaller than that of the outer ring fire cover bottom ring (12), and the outer ring fire cover top ring (11) and the outer ring fire cover bottom ring (12) are in an integrated structure and arranged in a stepped structure.

2. The low nitrogen oxides emitting combustor of claim 1, wherein: 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) form a secondary air shunt ring groove (13).

3. The low nitrogen oxides emissions burner of claim 1, wherein: When the combustion chamber (3) is arranged in the central hole of the energy-gathering disc pot 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 central hole.

4. The low nitrogen oxides emissions burner of claim 3, wherein: The energy-gathering disc pot support (7) comprises a top layer support (71), a heat insulation support (72) and a bottom layer support (73), the top layer support (71), the heat insulation support (72) and the bottom layer support (73) are arranged in sequence from top to bottom, the top layer support (71) and the heat insulation support (72) are arranged on the bottom layer support (73), a top layer heat insulation cavity (74) is formed between the top layer support (71) and the heat insulation support (72), and a bottom layer heat insulation cavity (75) is formed between the heat insulation support (72) and the bottom layer support (73).

5. The low nitrogen oxides emissions burner of claim 4, wherein: A heat insulation boss (738) is arranged on the top of the bottom layer support (73), the top layer support (71) is in contact with the heat insulation boss (738), so that the heat insulation through groove (739) is formed between the top layer support (71) and the bottom layer support (73).

6. The low nitrogen oxides emissions burner of claim 4, wherein: A limiting column (734) is arranged on the bottom of the bottom layer support (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).

7. The low nitrogen oxides emissions burner of claim 4, wherein: A supporting leg (711) is welded on the top layer support (71), a fastening nut (712) is welded on the supporting leg (711), a ground foot (731) is fixed on the bottom layer support (73), a fastening screw (733) is installed on the bottom layer support (73), and the fastening screw (733) is connected with the fastening nut (712).

8. The low nitrogen oxides emissions burner of claim 4, wherein: A supporting leg hole (721) is arranged on the heat insulation support (72), and the supporting leg (711) penetrates through the supporting leg hole (721).

9. The low nitrogen oxides emissions burner of claim 4, wherein: A supporting column (732) is fixed on the bottom layer support (73), and the heat insulation support (72) is installed on the supporting column (732) through a supporting screw (722).

10. The low nitrogen oxides emissions burner of claim 5, wherein: The heat insulation through groove (739) is in communication with the top layer heat insulation cavity (74) and the bottom layer heat insulation cavity (75).

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