Upper air inlet burner

Abstract

An upper air inlet burner comprises a base (1), an inner ring cavity (11) formed by enclosing of an outer peripheral wall (110) extending upwards is formed in the center of the base (1); the inner ring injection pipe (2) is transversely arranged at the bottom of the base (1), the air inlet end (2a) of the inner ring injection pipe (2) is located in the external environment and is correspondingly provided with a first nozzle (4) in a matched mode, and the air outlet end (2b) of the inner ring injection pipe (2) is communicated with the inner ring cavity (11); the inner ring injection pipe (2) is in a U shape and comprises a first injection section (21) extending outwards in the radial direction from the communicating position of the inner ring injection pipe (2) and the inner ring cavity (11), a second injection section (22) arranged side by side with the first injection section (21) and a transition section connecting the first injection section (21) and the second injection section (22), and an inlet of the second injection section (22) is the air inlet end (2a) of the inner ring injection pipe (2). Compared with the prior art, the injection capacity can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of household stoves, and in particular relates to an upper air inlet burner. Background Art

[0002] Existing upward air inlet burners mostly have an inner ring chamber and an outer ring chamber circumferentially located outside the inner ring chamber, and the bottom of the burner is provided with an inner ring ejector pipe connected to the inner ring chamber and an outer ring ejector pipe connected to the outer ring chamber. Specifically, as disclosed in the utility model patent "Upper Air Inlet Burner" with application number 202121464503.6 (authorization announcement number CN215637159U), the structure includes an ejector tube assembly and an air mixing chamber. The ejector tube assembly includes a first outer ring ejector tube, an inner ring ejector tube and a second outer ring ejector tube arranged in sequence. The inlet direction of the first outer ring ejector tube is the same as the inlet direction of the second outer ring ejector tube, and the inlet direction of the inner ring ejector tube is opposite to the inlet direction of the first outer ring ejector tube. The lower side of the mixing chamber has a skirt, and the ejector tube assembly is arranged in the skirt. The skirt has a plurality of vents, and the vents are arranged correspondingly to the inlet of the first outer ring ejector tube, the inlet of the second outer ring ejector tube and the inlet of the inner ring ejector tube.

[0003] Another example is the structure disclosed in the invention patent "Upper Air Inlet Burner" with application number 201910835801.2 (authorization announcement number CN112443841B), which includes an inner ring fire cover, an outer ring fire cover, and an air distribution plate; the air distribution plate includes: an outer ring ejector tube, an inner ring ejector tube, an outer ring chamber, and an inner ring chamber; the outer ring ejector tube is connected to the outer ring chamber, the inner ring ejector tube is connected to the inner ring chamber, the outer ring chamber is used to supply air to the outer ring fire cover, and the inner ring chamber is used to supply air to the inner ring fire cover; the outer ring chamber is an annular structure, the inner ring chamber is located inside the annular structure of the outer ring chamber, the inner ring ejector tube and the middle section of the outer ring chamber are cross-arranged, and the outer ring chamber gradually shrinks along the air intake direction in the outer ring chamber.

[0004] For the existing upper air inlet burner, affected by the outer diameter of the burner, the length of the inner ring ejector tube corresponding to the inner ring chamber is often short, which affects the ejection performance of the inner ring ejector tube. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide an upper air inlet burner capable of improving the ejection performance in view of the current status of the prior art.

[0006] The second technical problem to be solved by the utility model is to provide an upward air inlet burner to avoid nozzle blockage.

[0007] The third technical problem to be solved by the utility model is to provide an upper air inlet burner which is easy to clean.

[0008] The technical solution adopted by the utility model to solve the above-mentioned first technical problem is: an upper air inlet burner, comprising:

[0009] A base, the center of which has an inner ring cavity surrounded by an outer peripheral wall extending upward;

[0010] An inner ring ejector tube is horizontally placed at the bottom of the base, an air inlet end of the inner ring ejector tube is located in the external environment and is correspondingly equipped with a first nozzle, and an air outlet end of the inner ring ejector tube is connected to the inner ring cavity;

[0011] It is characterized in that: the inner ring ejector tube is U-shaped, including a first ejection section extending radially outward from the connection with the inner ring cavity, a second ejection section arranged side by side with the first ejection section, and a transition section connecting the two, and the inlet of the second ejection section is the air inlet end of the inner ring ejector tube.

[0012] The structure of the first ejection section, the second ejection section and the transition section in the utility model can extend the length of the inner ring ejection tube, so that the ejection performance is better and the fuel gas and the primary air can be fully mixed; when in use, the fuel gas and the primary air first enter the second ejection section of the inner ring ejection tube through the air inlet end, and then flow to the first ejection section of the inner ring ejection tube, and are input into the inner ring cavity of the base through the air outlet end of the first ejection section.

[0013] The first ejection section and the second ejection section may be arranged in parallel or at an angle. Preferably, the first ejection section and the second ejection section of the inner ring ejector tube are arranged at an acute angle therebetween.

[0014] Preferably, the air inlet end of the inner ring ejector tube is arranged adjacent to the outer peripheral wall of the inner ring cavity.

[0015] In the above scheme, in order to further improve the ejection performance, preferably, along the gas flow direction, the second ejection section of the inner ring ejector tube has a contraction section, a mixing section and a diffusion section that are sequentially connected, and the flow area on the cross section of the contraction section gradually decreases along the gas flow direction, and the port of the contraction section is the air inlet end of the inner ring ejector tube, and the flow area on the cross section of the diffusion section gradually increases along the gas flow direction. In this way, the gas can be accelerated when passing through the contraction section to better eject the primary air, and the gas and the primary air can be mixed in the second ejection section, and decelerated after entering the diffusion section, and then enter the first ejection section.

[0016] Preferably, the base further comprises an outer ring cavity circumferentially arranged outside the inner ring cavity, the inner circumferential wall of the outer ring cavity is spaced opposite to the outer circumferential wall of the inner ring cavity to form an annular cavity; the inner ring ejector tube is entirely located in the annular cavity, and the outer end of the first ejector section is adjacent to or in contact with the inner circumferential wall of the outer ring cavity. In this way, the utility model can extend the length of the inner ring ejector tube within the limited space of the annular cavity.

[0017] Furthermore, the outer end of the first ejection section is open and opposite to the inner peripheral wall of the outer ring cavity, and the edge of the outer end opening of the first ejection section is engaged with the inner peripheral wall of the outer ring cavity;

[0018] The outer end opening of the second ejection section is arranged side by side with the outer end of the first ejection tube and is opposite to the inner peripheral wall of the outer ring cavity, and the edge of the outer end opening of the second ejection section is engaged with the inner peripheral wall of the outer ring cavity;

[0019] At the same time, the edge of the outer end opening of the first ejection section has a first notch, and the edge of the outer end opening of the second ejection section has a second notch. The second notch is opposite to the first notch to connect the first ejection section and the second ejection section, and form a transition section of the inner ring ejection tube between the inner circumferential wall of the corresponding outer ring cavity.

[0020] In addition, the inner ring ejector tube of the present invention can also be a U-shaped integral piece.

[0021] Furthermore, it also includes an outer ring ejector pipe, which is horizontally placed at the bottom of the base and crosses the annular chamber avoiding the inner ring cavity. The gas input end of the outer ring ejector pipe is located in the external environment and is correspondingly equipped with a second nozzle. The gas output end of the outer ring ejector pipe is connected to the outer ring cavity.

[0022] Preferably, the outer ring ejector tube and the inner ring ejector tube are respectively arranged in the annular chambers on both sides of the inner ring cavity.

[0023] Preferably, the outer ring ejector tube is arranged at an acute angle with the second ejector section of the inner ring ejector tube, and the gas input end of the outer ring ejector tube is adjacent to the gas inlet end of the inner ring ejector tube and is arranged side by side.

[0024] To further solve the second technical problem, preferably, the first nozzle and the second nozzle of the base are provided with a circumferentially extending arc baffle and side plates extending downward from both ends of the arc baffle above the positions where the first nozzle and the second nozzle are located, and the two side plates, the arc baffle and the corresponding outer peripheral wall of the inner ring cavity and the inner peripheral wall of the outer ring cavity jointly define a concave cavity with an opening facing downward for the first and second nozzles to be arranged therein. The arrangement of the arc baffle can prevent the overflow from clogging the first and second nozzles; and the first and second nozzles are arranged in the concave cavity, which can prevent the external airflow from guiding the nozzle to work.

[0025] Preferably, a secondary air channel is provided at the bottom of the base away from the concave cavity to connect the annular chamber with the external environment outside the outer ring cavity. In this way, the secondary air does not affect the injection of the primary air when the nozzle is working.

[0026] To further solve the third technical problem, preferably, the base is formed by connecting the upper and lower parts in a detachable manner, and the first groove of the upper part with the notch facing downward and the second groove of the lower part with the notch facing upward are connected to form the inner ring ejector tube. In this way, by removing the upper part, the first groove of the upper part and the second groove of the lower part can be cleaned respectively, which is convenient for operation.

[0027] Preferably, the lower portion of the base has an outer peripheral surface extending upward;

[0028] The first part of the second groove corresponding to the first ejection section and the second part corresponding to the second ejection section are arranged side by side, and the outer ends of the first part and the second part are both opened to the outer peripheral surface of the lower part of the base. The design of the opening of the outer ends of the first and second parts facilitates the cleaning of both.

[0029] Preferably, the bottom wall of the first part of the second groove is inclined downward from the inside to the outside; the bottom wall of the second part of the second groove is inclined downward from the inside to the outside. In this way, the overflow liquid entering the first and second parts can flow to the lower place under the action of its own gravity and flow out from the outer end openings of the first and second parts.

[0030] In the above schemes, the upper air inlet burner is used in a stove.

[0031] Compared with the prior art, the advantages of the utility model are: the structure of the first ejection section, the second ejection section and the transition section in the utility model can extend the length of the inner ring ejection tube, so that the ejection performance is better, and the gas and the primary air can be fully mixed; when in use, the gas and the primary air first enter the second ejection section of the inner ring ejection tube through the air inlet end, and then flow to the first ejection section of the inner ring ejection tube, and are input into the inner ring cavity of the base through the air outlet end of the first ejection section. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0033] Figure 2 It is a structural schematic diagram of another viewing angle of the embodiment of the utility model;

[0034] Figure 3 It is a cross-sectional view of an embodiment of the utility model (the cross section is a horizontal plane);

[0035] Figure 4 It is a three-dimensional exploded view of an embodiment of the utility model;

[0036] Figure 5 for Figure 1 Sectional view along AA direction;

[0037] Figure 6 for Figure 2 Cross-sectional view along the BB direction;

[0038] Figure 7 for Figure 2 Sectional view along CC direction. DETAILED DESCRIPTION

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0040] like Figures 1 to 7 As shown, a preferred embodiment of an upper air inlet burner of the utility model is shown. The upper air inlet burner is used for a stove and includes a base 1, an inner ring ejector pipe 2, an outer ring ejector pipe 3, an inner ring fire cover 6 and an outer ring fire cover 7.

[0041] The base 1 has an inner ring cavity 11 in the center surrounded by an outer peripheral wall 110 extending upward, and an outer ring cavity 12 arranged circumferentially around the inner ring cavity 11, and the inner peripheral wall 120 of the outer ring cavity 12 is spaced apart from the outer peripheral wall 110 of the inner ring cavity 11 to form an annular chamber 10. The inner ring fire cover 6 and the outer ring fire cover 7 are both prior art and are respectively covered on the inner ring cavity 11 and the outer ring cavity 12.

[0042] The inner ring ejector tube 2 is horizontally placed at the bottom of the base 1 and is located in the annular chamber 10. The inner ring ejector tube 2 is U-shaped, and has a first ejector section 21 extending radially outward from the outer peripheral wall 110 of the inner ring cavity 11, a second ejector section 22 arranged side by side with the first ejector section 21, and a transition section connecting the two. The first ejector section 21 and the second ejector section 22 are arranged at an acute angle. The inlet of the second ejector section 22 is the air inlet end 2a of the inner ring ejector tube 2, and is located in the external environment (adjacent to the outer peripheral wall 110 of the inner ring cavity 11) and is correspondingly adapted with the first nozzle 4. The outlet at the inner end of the first ejector section 21 is the air outlet end 2b of the inner ring ejector tube 2 and is connected to the inner ring cavity 11. The outer end of the first ejector section 21 is adjacent to or in contact with the inner peripheral wall 120 of the outer ring cavity 12.

[0043] In this embodiment, along the gas flow direction, the second ejection section 22 of the inner ring ejector tube 2 has a contraction section 221, a mixing section 222 and a diffusion section 223 which are connected in sequence. The flow area on the cross section of the contraction section 221 gradually decreases along the gas flow direction. The port of the contraction section 221 is the gas inlet end 2a of the inner ring ejector tube 2. The flow area on the cross section of the diffusion section 223 gradually increases along the gas flow direction.

[0044] At the same time, if Figure 6 , 7As shown, the outer end of the first ejection section 21 is open and opposite to the inner circumferential wall 120 of the outer ring cavity 12, and the edge of the outer end opening of the first ejection section 21 is engaged with the inner circumferential wall 120 of the outer ring cavity 12; the outer end opening of the second ejection section 22 is arranged side by side with the outer end of the first ejection tube and opposite to the inner circumferential wall 120 of the outer ring cavity 12, and the edge of the outer end opening of the second ejection section 22 is engaged with the inner circumferential wall 120 of the outer ring cavity 12; the edge of the outer end opening of the first ejection section 21 has a first notch 210, and the edge of the outer end opening of the second ejection section 22 has a second notch 220, and the second notch 220 is opposite to the first notch 210 to connect the first ejection section 21 and the second ejection section 22, and form a transition section of the inner ring ejection tube 2 with the corresponding inner circumferential wall 120 of the outer ring cavity 12.

[0045] like Figures 1 to 5 As shown, the outer ring ejector tube 3 is horizontally placed at the bottom of the base 1, and crosses the annular chamber 10 avoiding the inner ring cavity 11, the gas input end 3a of the outer ring ejector tube 3 is located in the external environment and is correspondingly adapted with the second nozzle 5, and the gas output end 3b of the outer ring ejector tube 3 is connected with the outer ring cavity 12. In this embodiment, the outer ring ejector tube 3 and the inner ring ejector tube 2 are respectively arranged in the annular chamber 10 on both sides of the inner ring cavity 11, and the outer ring ejector tube 3 and the second ejection section 22 of the inner ring ejector tube 2 are arranged at an acute angle, and the gas input end 3a of the outer ring ejector tube 3 and the gas inlet end 2a of the inner ring ejector tube 2 are adjacent and arranged side by side.

[0046] In order to prevent the overflow from clogging the nozzle, the first nozzle 4 and the second nozzle 5 of the base 1 are provided with a circumferentially extending arc baffle 13 and side plates 14 extending downward from both ends of the arc baffle 13 above the positions where the arc baffle 13 is located. The two side plates 14, the arc baffle 13 and the corresponding outer peripheral wall 110 of the inner ring cavity 11 and the inner peripheral wall 120 of the outer ring cavity 12 jointly define a concave cavity 130 with an opening facing downward, for the first and second nozzles to be arranged therein. At the same time, a secondary air channel 15 is also provided at the bottom of the base 1 away from the concave cavity 130 to connect the annular chamber 10 with the external environment outside the outer ring cavity 12. This makes the secondary air and the primary air not interfere with each other.

[0047] like Figure 4As shown, in order to facilitate cleaning, in this embodiment, the base 1 is formed by connecting the upper and lower parts in a detachable manner, and the first groove 101 with the notch facing downward in the upper part 1a and the second groove 102 with the notch facing upward in the lower part 1b are connected to form the inner ring ejector tube 2. The lower part 1b of the base 1 has an outer peripheral surface extending upward, and the first part 1021 of the second groove 102 corresponding to the first ejection section 21 and the second part 1022 corresponding to the second ejection section 22 are arranged side by side, and the outer ends of the first part 1021 and the outer ends of the second part 1022 are both open to the outer peripheral surface of the lower part 1b of the base 1. At the same time, the groove bottom wall of the first part 1021 of the second groove 102 is inclined downward from the inside to the outside; the groove bottom wall of the second part 1022 of the second groove 102 is inclined downward from the inside to the outside. So that the overflow can flow out of the first part 1021 and the second part 1022 under the action of its own gravity.

[0048] Similarly, the outer ring ejector tube 3 of this embodiment is also formed by connecting a third groove with a notch facing downward located in the upper part 1a and a fourth groove with a notch facing upward located in the lower part 1b.

[0049] When in use, the gas ejected from the first nozzle 4 first enters the second ejection section 22 of the inner ring ejection tube 2 through the gas inlet end 2a, then deflects to the first ejection section 21 of the inner ring ejection tube 2, and is input into the inner ring cavity 11 of the base 1 through the gas outlet end 2b of the first ejection section 21. The gas ejected from the second nozzle 5 enters the outer ring ejection tube 3 through the gas inlet end 3a, and then is input into the outer ring cavity 12 of the base 1 through the gas outlet end 3b.

[0050] When cleaning is required, the upper portion 1 a of the base 1 is removed, and each groove of the upper portion 1 a and the lower portion 1 b is cleaned.

[0051] The term "vertical" is also used in the specification and claims of the present utility model, which means basically along the up and down direction, and is not limited to the vertical direction only, and can also be slightly inclined relative to the vertical direction.

[0052] The term "radial" is also used in the specification and claims of the present utility model, which means basically along the inward and outward direction, and is not limited to the radial direction passing through the center of the circle, and can also be slightly deviated from the radial direction.

Claims

1. A top-inlet burner, comprising: A base (1) has an inner ring cavity (11) at its center formed by an outer peripheral wall (110) extending upward; An inner ring ejector tube (2) is horizontally placed at the bottom of the base (1); an air inlet end (2a) of the inner ring ejector tube (2) is located in the external environment and is correspondingly equipped with a first nozzle (4); and an air outlet end (2b) of the inner ring ejector tube (2) is connected to the inner ring cavity (11); Its characteristics are: The inner ring ejector tube (2) is U-shaped and comprises a first ejector section (21) extending radially outward from a connection point with the inner ring cavity (11), a second ejector section (22) arranged side by side with the first ejector section (21), and a transition section connecting the two. The inlet of the second ejector section (22) is the air inlet end (2a) of the inner ring ejector tube (2).

2. The upward air inlet burner according to claim 1, characterized in that: The first ejection section (21) and the second ejection section (22) of the inner ring ejection tube (2) are arranged at an acute angle therebetween.

3. The upward air inlet burner according to claim 2, characterized in that: The air inlet end (2a) of the inner ring ejector tube (2) is arranged adjacent to the outer peripheral wall (110) of the inner ring cavity (11).

4. The upward air inlet burner according to claim 1, characterized in that: Along the flow direction of the gas, the second ejection section (22) of the inner ring ejector tube (2) has a contraction section (221), a mixing section (222) and a diffusion section (223) that are sequentially connected. The flow area on the cross section of the contraction section (221) gradually decreases along the flow direction of the gas. The port of the contraction section (221) is the gas inlet end (2a) of the inner ring ejector tube (2). The flow area on the cross section of the diffusion section (223) gradually increases along the flow direction of the gas.

5. The upward air inlet burner according to claim 1, characterized in that: The base (1) further comprises an outer ring cavity (12) circumferentially arranged on the periphery of the inner ring cavity (11), wherein the inner peripheral wall (120) of the outer ring cavity (12) is spaced apart from the outer peripheral wall (110) of the inner ring cavity (11) to form an annular cavity (10); the inner ring ejector tube (2) is entirely located in the annular cavity (10), and the outer end of the first ejector section (21) is adjacent to or in contact with the inner peripheral wall (120) of the outer ring cavity (12).

6. The upward air inlet burner according to claim 5, characterized in that: The outer end of the first ejection section (21) is open and faces the inner peripheral wall (120) of the outer ring cavity (12), and the edge of the outer end opening of the first ejection section (21) is engaged with the inner peripheral wall (120) of the outer ring cavity (12); The outer end opening of the second ejection section (22) is arranged side by side with the outer end of the first ejection tube and is opposite to the inner peripheral wall (120) of the outer ring cavity (12), and the edge of the outer end opening of the second ejection section (22) is engaged with the inner peripheral wall (120) of the outer ring cavity (12); At the same time, the edge of the outer opening of the first ejection section (21) has a first notch (210), and the edge of the outer opening of the second ejection section (22) has a second notch (220). The second notch (220) is opposite to the first notch (210) to connect the first ejection section (21) and the second ejection section (22), and forms a transition section of the inner ring ejection tube (2) between the second notch (220) and the inner circumferential wall (120) of the corresponding outer ring cavity (12).

7. The upward air inlet burner according to claim 5, characterized in that: The invention also includes an outer ring ejector tube (3), which is horizontally placed at the bottom of the base (1) and crosses the annular chamber (10) while avoiding the inner ring cavity (11); the gas input end (3a) of the outer ring ejector tube (3) is located in the external environment and is correspondingly equipped with a second nozzle (5); and the gas output end (3b) of the outer ring ejector tube (3) is connected to the outer ring cavity (12).

8. The upward air inlet burner according to claim 7, characterized in that: The outer ring ejector tube (3) and the inner ring ejector tube (2) are respectively arranged in the annular chambers (10) on both sides of the inner ring cavity (11).

9. The upward air inlet burner according to claim 8, characterized in that: The outer ring ejector tube (3) and the second ejection section (22) of the inner ring ejector tube (2) are arranged at an acute angle, and the gas input end (3a) of the outer ring ejector tube (3) and the gas inlet end (2a) of the inner ring ejector tube (2) are adjacent to and arranged side by side.

10. The upward air inlet burner according to claim 9, characterized in that: Above the positions of the first nozzle (4) and the second nozzle (5) of the base (1), there are a circumferentially extending arc-shaped baffle (13) and side plates (14) extending downward from both ends of the arc-shaped baffle (13); the two side plates (14), the arc-shaped baffle (13) and the corresponding outer peripheral wall (110) of the inner ring cavity (11) and the inner peripheral wall (120) of the outer ring cavity (12) jointly define a concave cavity (130) with an opening facing downward, for the first and second nozzles to be arranged therein.

11. The upward air inlet burner according to claim 10, characterized in that: A secondary air passage (15) is also provided at the bottom of the base (1) at a position away from the concave cavity (130) to connect the annular chamber (10) with the external environment outside the outer ring cavity (12).

12. The updraft burner according to any one of claims 1 to 11, characterized in that: The base (1) is formed by connecting the upper and lower parts in a detachable manner, and the first groove (101) with the notch facing downwards of the upper part (1a) and the second groove (102) with the notch facing upwards of the lower part (1b) are connected to form the inner ring ejector tube (2).

13. The upward air inlet burner according to claim 12, characterized in that: The lower portion (1b) of the base (1) has an outer peripheral surface extending upward; The first portion (1021) of the second groove (102) corresponding to the first ejection section (21) and the second portion (1022) corresponding to the second ejection section (22) are arranged side by side, and the outer ends of the first portion (1021) and the second portion (1022) are both open to the outer peripheral surface of the lower portion (1b) of the base (1).

14. The upward air inlet burner according to claim 13, characterized in that: The bottom wall of the first portion (1021) of the second groove (102) is inclined downward from the inside to the outside; and the bottom wall of the second portion (1022) of the second groove (102) is inclined downward from the inside to the outside.

15. The updraft burner according to any one of claims 1 to 12, characterized in that: The upper air inlet burner is used for a stove.

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