An updraft burner on a cooking hob

Abstract

The application discloses a stove upper air inlet burner, which comprises a burner base and a fire cover, and a circular channel for gas flow is arranged on the surface of the burner base, the circular channel is formed by a left channel and a right channel, the left channel is gradually lifted in the height direction with the change of the central angle and is ended above the right air inlet hole, the right channel is gradually lifted in the height direction with the change of the central angle and is ended above the left air inlet hole, the left and right air inlet holes are respectively extended backward to connect with the injection pipe, a plurality of fire holes are arranged on the outer wall of the circular channel of the burner base, and the fire cover is matched and covered on the surface of the circular channel.

Description

Technical Field

[0001] This invention relates to a stove, specifically a gas stove, and more particularly to an improvement in the structure of the air intake burner on the stove. Background Technology

[0002] Existing stoves consist of a burner, a liquid collection tray, and other components. The liquid collection tray is located below the burner, and there is a gap in the vertical direction between the burner and the liquid collection tray. This gap is used to supplement secondary air, allowing the gas-air mixture to be fully combusted after flowing out of the burner holes. Current stoves have the following drawbacks: First, the design of the injector tube is greatly limited. Its length is insufficient, and there is not enough space to design a complete contraction section, mixing section, and diffusion section, preventing sufficient air from being injected for combustion. This results in insufficient mixing and diffusion of the gas-air mixture, leading to a weak, flickering flame, incomplete combustion, high CO content, low thermal efficiency, and difficulty in achieving a high heat load. Second, the axis of the injector tube is parallel to the horizontal plane, and its vertical dimension (i.e., the normal direction of the axis) gradually increases with the airflow direction. This increases the vertical dimension of the injector tube, reducing the gap in the vertical direction between the burner and the liquid collection tray, thereby reducing the secondary air intake area. This is not conducive to complete combustion and also makes it difficult to achieve a high heat load. Third, the increased vertical dimensions of the ejector tube significantly increase the overall height of the burner, affecting the product's aesthetics. Fourth, because both the outer and inner circulation channels of the gas are annular, the gas enters from the horizontal ejector tube, flows into the burner cavity, and finally exits through the flame nozzle. This can easily cause uneven airflow transitions, increasing airflow resistance and reducing the velocity of the gas exiting the flame nozzle. The slower velocity further reduces the mixing speed and uniformity of the gas and air, lowering the combustion speed and making it difficult to achieve a high heat load. Summary of the Invention

[0003] To address the aforementioned technical deficiencies, the present invention aims to provide a top-inlet burner that ensures stable and complete combustion. This burner not only reduces the height between the burner and the liquid tray, increasing the air intake area and facilitating complete combustion, but also makes the gas pressure within the annular channel more uniform and the firepower more stable.

[0004] This invention discloses a technical solution for a stovetop burner with stable and complete combustion, comprising: a burner base and a flame cap; an annular channel for gas flow is provided on the surface of the burner base, the annular channel being formed by a left annular channel and a right annular channel; the left annular channel starts from a left air inlet located below the burner base and gradually rises in height as the central angle changes, the rise is continuous and ends above the right air inlet; the right annular channel starts from a right air inlet located below the burner base and gradually rises in height as the central angle changes, the rise is continuous and ends above the left air inlet; ejector tubes connecting to gas pipes extend rearward from the left and right air inlets respectively; several flame holes are also provided on the outer wall of the annular channel of the burner base; the flame cap is fitted onto the surface of the annular channel.

[0005] By adopting the above technical solution, an annular channel is opened on the burner base surface, which is composed of a left annular channel and a right annular channel. The left annular channel starts from the left air inlet located below the burner base and gradually rises in height as the central angle changes, continuing its rise and ending above the right air inlet. The right annular channel starts from the right air inlet located below the burner base and gradually rises in height as the central angle changes, continuing its rise and ending above the left air inlet. Injector tubes connecting to the gas pipes extend rearward from both the left and right air inlets. This design not only reduces the height between the burner and the liquid tray, increasing the air intake area and improving heating uniformity and thermal efficiency, but also increases the heat load. The gas and air mix more evenly within the annular channel, resulting in more powerful ejection and more uniform gas distribution through each burner orifice. In addition, the gas that is not ejected from the burner in the left ring will flow into the right ring, and the gas that is not ejected from the burner in the right ring will mix back into the left ring and continue to circulate. In this way, the airflow resistance in the annular channels is reduced and the flow is smoother, which increases the speed at which the gas flows out of the burner. At the same time, it also increases the mixing speed and uniformity of the gas and air, which can increase the combustion speed and thus increase the heat load.

[0006] To better achieve the purpose of the invention, the present invention also has the following preferred solutions:

[0007] In some embodiments, the ejector tube has a Venturi structure; in some embodiments, the ejector tube consists of a contraction section, a mixing section, and a diffusion section; in some embodiments, the ejector tube is a separate external pipe or is formed by die-casting and drilling after being integrally formed with the burner base. The cross-section of the burner base gradually contracts with the change of the central angle, and the space below it is reserved for the ejector tube. Firstly, this solves the problem of limited design and insufficient length of the ejector tube, allowing sufficient space to design a relatively complete contraction section, mixing section, and diffusion section, ensuring sufficient primary air injection, thorough mixing of the fuel-air mixture, and sufficient diffusion, resulting in a strong and powerful flame, complete combustion, reduced CO, and improved thermal efficiency, which is beneficial for increasing the heat load. Secondly, it increases the clearance between the burner and the liquid tray in the height direction, thereby increasing the secondary air intake area, which is beneficial for complete combustion and increasing the heat load. Thirdly, the fuel-air mixture in the annular channel will be re-injected and pressurized by the high-speed fuel-air mixture flowing out of the ejector tube outlet, which is beneficial for increasing the heat load. Fourth, it helps control the height and dimensions of the burner, and is beneficial for heat dissipation and air convection.

[0008] In some embodiments, the left and right annular channels gradually rise along a cylindrical helix, whose Cartesian coordinate equations are x = R × cos(t), y = R × sin(t), z = p × n × t / (2 × π). The origin of this Cartesian coordinate system is located on the rotation axis of the outer circumference of the burner base; R is the radius of the cylindrical helix; t is the central angle; n is the number of ejector tubes arranged circumferentially; point 32 is the intersection of the cylindrical helix and the outlet of the ejector tube, with a central angle t = 0, x = R, y = 0, z = 0; point 32 is a point on the cylindrical helix with a central angle t = 2 * π / n; p is the height difference between the ejector tube axis and the apex. The ejector tube axis lies on the plane tangent to the cylindrical helix. The expansion angle formed by the two walls of the flame nozzle is θ, and the expansion angle θ decreases as the central angle t increases. The upward tilt angle α of the flame nozzle is 5°≤α≤50°. This cylindrical spiral is designed as a curve with a constant slope rising on the cylindrical surface, which helps to reduce flow losses, increase the static pressure of the gas-air mixture in the burner base, make the flame strong and powerful, ensure complete combustion, reduce CO, and improve thermal efficiency, thus facilitating a larger heat load. In some embodiments, a connecting channel is also included, one end of which is connected to an annular channel and the other end is connected to an inner annular channel, for inputting gas into the inner annular channel. Attached Figure Description

[0009] Figure 1 This is a three-dimensional structural diagram of the burner in the embodiment;

[0010] Figure 2 This is a three-dimensional structural diagram of the burner base in an embodiment;

[0011] Figure 3 This is a three-dimensional structural diagram of the back of the burner base in an embodiment;

[0012] Figure 4 This is a schematic diagram of the structure of one side of the burner in the embodiment;

[0013] Figure 5 This is a schematic diagram of the structure of another side of the burner in the embodiment.

[0014] Figure label:

[0015] 1. Burner base; 15. Flame hole; 17. Face flame hole; 2. Burner cap; 3. Annular channel; 31. Left annular channel; 32. Right annular channel; 33. Left air inlet; 34. Right air inlet; 4. Injector tube; 41. Contraction section; 42. Mixing section; 43. Diffusion section; 5. Inner annular channel; 6. Connecting channel. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to embodiments, so that those skilled in the art can better understand the specific solutions of the present invention:

[0017] This invention discloses a stovetop burner with stable and complete combustion, comprising: a burner base 1 and a flame cap 2. An annular channel 3 for gas flow is provided on the surface of the burner base 1, the annular channel 3 being formed by a left annular channel 31 and a right annular channel 32. The left annular channel 31 begins at a left air inlet 33 located below the burner base 1 and gradually rises in height as the central angle changes, its rise continuing and changing with the central angle before ending at the right air inlet 32. Above 4; the right annular channel 32 starts from the right air inlet 34 below the burner base 1 and gradually rises in height as the central angle changes. The rise continues and stops above the left air inlet 33 as the central angle changes. The left and right air inlets 33 and 34 extend backward to the injector tube 4 connected to the gas pipe. Several flame holes 15 are also provided on the outer wall of the annular channel 3 of the burner base 1. The flame cap 2 is matched and covers the surface of the annular channel 3.

[0018] By adopting the above-mentioned technical solution, this design not only reduces the height between the burner and the liquid tray, increasing the air intake area and improving heating uniformity and thermal efficiency, but also increases the heat load. The gas and air mix more evenly in the annular channel, resulting in more powerful ejection and more uniform gas distribution through each burner hole 15. Furthermore, gas not ejected from the burner holes 15 in the left annular channel 31 flows into the right annular channel 32, and the gas not ejected from the burner holes 15 in the right annular channel 32 mixes back into the left annular channel 31, continuing the circulation. This reduces airflow resistance within the annular channel 3, ensuring smoother flow and increasing the speed at which gas flows out of the burner holes. It also improves the mixing speed and uniformity of the gas and air, thereby increasing the combustion speed and thus the heat load.

[0019] In some embodiments, the ejector tube 4 has a venturi structure; in some embodiments, the ejector tube 4 consists of a contraction section 41, a mixing section 42, and a diffuser section 43; in some embodiments, the ejector tube 4 is a separate external pipe connected to each air inlet, or it can be formed by die-casting the burner base 1 as a single piece and then drilling holes. In some embodiments, the cross-section of the burner base 1 gradually contracts with the change of the central angle, and the space below it is reserved for the ejector tube 4. Firstly, this solves the problem of limited design and insufficient length of the ejector tube 4, allowing sufficient space to design a relatively complete contraction section 41, mixing section 42, and diffuser section 43, ensuring sufficient primary air injection, thorough mixing of the fuel gas and air mixture, and sufficient diffusion, resulting in a strong and powerful flame, complete combustion, reduced CO, and improved thermal efficiency, which is beneficial for increasing the heat load. Secondly, it increases the clearance between the burner and the liquid tray in the height direction, thereby increasing the secondary air intake area, which is beneficial for complete combustion and increasing the heat load. Third, the gas-air mixture inside the annular channel 3 will be re-injected and pressurized by the high-speed gas-air mixture flowing out of the ejector tube 4, which is beneficial for increasing the heat load. Fourth, it is beneficial for controlling the burner height and size, and for heat dissipation and air convection.

[0020] In some embodiments, a connecting channel 6 is also included, one end of which is connected to the annular channel 3 and the other end of which is connected to the inner annular channel 5, for inputting gas into the inner annular channel 5.

[0021] In some embodiments, the left annular channel 31 and the right annular channel 32 gradually rise upwards along a cylindrical helix. The Cartesian coordinate equations of this helix are x = R × cos(t), y = R × sin(t), z = p × n × t / (2 × π). The origin of this Cartesian coordinate system is located on the rotation axis of the outer circumference of the burner base 1; R is the radius of the cylindrical helix; t is the central angle; n is the number of ejector tubes arranged circumferentially; point 32 is the intersection of the cylindrical helix and the outlet of the ejector tube 4, with a central angle t = 0, x = R, y = 0, z = 0; point 32 is a point on the cylindrical helix with a central angle t = 2 * π / n, and p is the height difference between the axis of the ejector tube 4 and the apex. The plane is tangent to the cylindrical helix. The expansion angle formed by the two walls of the flame nozzle 15 is θ, and the expansion angle θ decreases as the central angle t increases; the flame nozzle 15 is set with an upward tilt angle α of 5°≤α≤50°. The cylindrical spiral designed in this way is a curve with a constant slope rising on the cylindrical surface, which helps to reduce flow loss, increase the static pressure of the gas-air mixture in the burner base 1, make the flame strong and powerful, the combustion complete, reduce CO, improve thermal efficiency, and help to increase the heat load.

[0022] The above descriptions are merely some embodiments of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this application, and all such modifications and improvements fall within the scope of protection of this invention.

Claims

1. A stove top-intake burner, comprising a burner base (1) and a flame cap (2), characterized in that: The burner base (1) has an annular channel (3) for gas flow, which is formed by a left annular channel (31) and a right annular channel (32). The left annular channel (31) starts from the left air inlet (33) below the burner base (1) and gradually rises in height as the central angle changes. The rise continues and ends above the right air inlet (34) as the central angle changes. The right annular channel (32) starts from the right air inlet (34) below the burner base (1) and gradually rises in height as the central angle changes. The rise continues and ends above the left air inlet (33). The left and right air inlets (33) and (34) extend backward with injectors (4) that connect to the gas pipes. Several flame holes (15) are also provided on the outer wall of the annular channel (3) of the burner base (1), and the flame cap (2) is matched and covered on the surface of the annular channel (3); the left annular channel (31) and the right annular channel (32) are gradually raised along the cylindrical spiral line. The Cartesian coordinate system equation of the spiral line is x=R×cos(t), y=R×sin(t), z=p×n×t / (2×π). The origin of the Cartesian coordinate system is located on the rotation axis of the outer circumference of the burner base (1); R is the radius of the cylindrical spiral line; t is the central angle; n is the number of ejector tubes arranged in a circumferential rotation; p is the height difference between the ejector tube axis and the vertex; the expansion angle formed by the two walls of the flame hole (15) is θ, and the expansion angle θ decreases as the central angle t increases.

2. The stove top-intake burner according to claim 1, characterized in that, The ejector tube (4) has a Venturi structure.

3. A stove top-intake burner according to claim 1 or 2, characterized in that, The ejector tube (4) is composed of a contraction section (41), a mixing section (42), and a diffusion section (43).

4. A stove top-intake burner according to claim 1 or 2, characterized in that, The ejector tube (4) is either a separate external tube or formed by drilling after die casting and integral molding with the burner base (1).

5. A stove top-intake burner according to claim 1, characterized in that, The ejector axis and the cylindrical helix are on a tangent plane.

6. A stove top-intake burner according to claim 1, characterized in that, The flame-emitting hole (15) is set with an upward tilt angle α of 5°≤α≤50°.

7. A stove top-intake burner according to claim 1, characterized in that, A top surface flame hole (17) is also provided between the two flame holes (15).

8. A stove top-intake burner according to claim 1, characterized in that, It also includes a connecting channel (6), one end of which is connected to an annular channel (3) and the other end is connected to an inner annular channel (5) for inputting gas into the inner annular channel (5).

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