Central fire cover of direct injection type burner

Abstract

The invention belongs to the technical field of gas stoves, and particularly relates to a center fire cover of a direct injection type combustor. Comprising a side wall and a top, the side wall and the top are matched to form a gas cavity, a plurality of exhaust holes are formed in the peripheral wall of the side wall, the side wall is provided with a gas outlet channel communicated with the exhaust holes and the gas cavity, and the gas outlet channel is obliquely arranged in the axial direction; and the bottom surface and the peripheral surface of the waste liquid cavity are closed. The gas burner has the advantages that the whole structure is integrally formed, the structure is simpler, oil is contained in the large-capacity waste liquid cavity, and the combustion efficiency and the combustion effect are improved by improving the structures of the gas outlet channel and the gas cavity.

Description

Technical Field

[0001] This invention belongs to the field of gas stove technology, and in particular relates to a center burner cap for a direct injection burner. Background Technology

[0002] A gas stove, also known as a coal gas stove, cooktop, or stove, is a kitchen appliance that uses liquefied petroleum gas (LPG), manufactured gas, or natural gas for direct-fire heating. Direct-injection burners typically have a built-in "direct-injection tube." Through a specially designed gas passage within the tube, when gas is ejected from the upward-facing nozzle, it directly draws in air at high speed within the injection tube, forming a uniform "gas-air mixture," which is then ejected through the burner cap's flame holes for combustion.

[0003] Chinese invention patent application number 2024100153763 discloses a high-power direct-injection burner, which includes a central burner cap. The top surface of the central burner cap has several flame holes, which are inclined relative to the axis. The side walls of the central burner cap are closed, or the side walls are closed except for the gas outlet structure that cooperates with ignition or anti-flameout. A groove is also provided on the top surface of the central burner cap, extending from the center to the edge and opening at the edge to form a slot. In direct-injection burners, the nozzles face upwards. During cooking on a gas stove, sticky oil stains easily drip from the bottom of the cookware to the top of the central burner cap. This design's groove can collect the oil stains dripping from the bottom of the cookware, and the oil stains can flow out from the slot, preventing oil stains from dripping through the flame holes from the center onto the nozzle and clogging it.

[0004] In the above scheme, the flame holes are located on the top of the central flame cap body. The flame holes occupy a large area on the top of the central flame cap, while the groove area is small. On the one hand, this results in a small capacity for oil stains in the groove. On the other hand, the groove is located above the nozzle, resulting in a small coverage area for the nozzle. In addition, the flame holes are set at an angle relative to the axis, and the bottom outlet of the flame holes is closer to the top of the nozzle, which increases the possibility that oil stains will drip from the surrounding flame holes onto the nozzle and block it.

[0005] Chinese invention patent application number 2023100317133 discloses a flame spreader and a burner, which discloses an inner ring flame cover. The inner ring flame cover and the cover body enclose each other to form an inner ring gas passage. The inner ring flame cover has at least one set of inner ring flame holes. The inner ring flame hole set includes multiple inner ring flame holes that communicate with the inner ring gas passage. The inner ring flame holes of at least one set of inner ring flame holes are opened on the side wall of the inner ring flame cover.

[0006] The above-mentioned solution places the flame outlet on the side wall of the burner cap, which can prevent oil stains from falling from the flame outlet and clogging the nozzle. However, the interior of the burner cap is a cylindrical chamber. After the secondary air enters from the bottom, it needs to be turned vertically upward and then turn to the flame outlet. The flow path has a "corner" and the resistance is relatively large, which may lead to uneven local air supply. Similarly, when the gas enters, it also needs to "turn" to enter the flame outlet, resulting in kinetic energy loss, reducing the speed and force of the gas ejection, and thus causing problems such as flame "shaking", incomplete combustion, and excessive flue gas.

[0007] Chinese utility model patent application number 2023216747705 discloses a central burner cap, a burner, and a combustion stove. The central burner cap includes a burner cap body and an anti-blocking part. The burner cap body includes a connected top wall and a side wall, which cooperate to form a gas chamber. The top wall has a flame stabilizing hole communicating with the gas chamber, and the side wall has a flame outlet hole communicating with the gas chamber. The anti-blocking part is connected to the top wall, and its side facing the top wall forms a flame stabilizing groove communicating with the gas chamber. The projection of the burner cap body on the horizontal plane is located within the area of ​​the projection of the anti-blocking part on the same horizontal plane.

[0008] The above solution reduces the risk of blockage of the flame outlets and flame stabilizers on the central flame cap by covering the flame cap body with an anti-blocking part. However, the anti-blocking part is prone to contact with the flame at the flame outlet, and the flame at the uppermost flame outlet is more likely to come into contact with the anti-blocking part, causing problems such as localized cooling, incomplete combustion, and the generation of flue gas, which affects the combustion efficiency and combustion effect of the gas. Moreover, the anti-blocking part and the flame cap body of the above solution are separate structures, which are relatively complex.

[0009] Furthermore, the scheme also discloses a flared burner structure with inclined sidewalls. The inclined sidewalls guide airflow, allowing air to flow smoothly upwards along the inclined surface of the sidewalls with a short path and low resistance. However, in actual use, when multiple exhaust ports are set in this type of burner with inclined sidewalls, the combustion effect of the upper and lower exhaust ports differs significantly. When air passes through the lower exhaust port, a large amount of oxygen is consumed, and the heated air causes instability in the airflow path. This leads to problems such as incomplete combustion of fuel gas, smoke production, and reduced flame temperature at the upper exhaust port. Summary of the Invention

[0010] The purpose of this invention is to address the above-mentioned problems by providing a central burner cap with better anti-clogging effect, higher combustion efficiency, and better combustion performance, and with an integrated structure.

[0011] To achieve the above objectives, the present invention adopts the following technical solutions: A central burner cap for a direct injection burner includes a side wall and a top, which together form a combustion chamber. The side wall has several rows of exhaust channels connecting the combustion chamber and the outside of the burner cap, and the exhaust channels are inclined in the axial direction. The top has a concave waste liquid chamber, the bottom and circumference of which are closed. The combustion chamber includes an inclined portion and an arc-shaped portion above the inclined portion. An upper exhaust channel connects to the arc-shaped portion, and a lower exhaust channel connects to the inclined portion.

[0012] The waste liquid chamber in this design is a further improvement on the existing top, extending inwards to form a single, integral structure. This eliminates the need for additional waste liquid containment components, resulting in a simpler structure. In actual use, the oil slides down the bottom of the cookware, which is then positioned above the waste liquid chamber. The oil drips into the chamber, where it is contained, preventing it from entering the gas chamber. Only periodic cleaning of the waste liquid chamber is required. Even if some waste liquid falls into the upper exhaust channel, it will slide down the curved inner wall of the exhaust channel instead of dripping directly onto the nozzle. The gas is ejected from the inclined exhaust channel in an inclined direction. The flame will be further offset from the top to avoid contact with the top, which would affect combustion efficiency and combustion effect. When air is replenished into the gas chamber for the second time, the air flows smoothly upward along the inclined surface of the side wall, which can mix fully with the gas and ensure the combustion effect of the flame at the lower exhaust channel. As for the upper exhaust channel, the hole at the lower end of the exhaust channel connects to the top surface of the arc-shaped structure, which is equivalent to changing the angle between the exhaust channel and the tangent of the inner circumferential wall of the side wall. At the same time, the arc-shaped part plays a guiding role, optimizing the secondary air replenishment path, improving the mixing effect of air and gas, thereby improving the combustion effect and combustion efficiency of the flame at the upper exhaust channel, increasing the flame temperature, and reducing the generation of flue gas.

[0013] In the central burner cap of this direct injection burner, the side wall includes a seat and an outlet section. The outlet channel is located on the outlet section, and the outer peripheral wall of the outlet section is inclined towards the center, forming a frustum shape that is larger at the bottom and smaller at the top.

[0014] The inclined, layered air outlet channels do not overlap in the horizontal projection, which facilitates the diffusion of the ejected flame and also plays a role in stabilizing the flame. In addition, the inclined outer peripheral wall of the air outlet can accommodate more rows of air outlet channels without changing the height of the air outlet. The porous design results in a shorter flame during combustion, avoiding incomplete combustion caused by uneven local temperature due to overlap with the flames of other burners in the outer ring, and reducing the generation of flue gas during combustion.

[0015] In the central burner cap of this direct injection burner, the angle α between the exhaust passage and the horizontal plane is 45°-50°.

[0016] When the nozzle of a direct-injection burner sprays gas upwards into the gas chamber, the gas diffuses outwards. When the angle α between the gas outlet channel and the horizontal plane is 45°-50°, the angle of the gas outlet channel is closest to the angle of gas diffusion. The gas enters the gas channel directly, reducing the kinetic energy loss caused by turning. The gas exiting the gas outlet channel has a faster speed, a larger gas volume, and a higher combustion temperature. At the same time, the gas outlet speed is greater than the combustion speed, which can also avoid the phenomenon of backfire.

[0017] In the center burner of this direct injection burner, the wall thickness of the side wall is 6-7 mm.

[0018] Direct injection burners have a relatively fast gas output velocity. To prevent flameout due to excessively fast gas output velocity, the side wall thickness can be increased. When the side wall thickness is 6-7mm, the effect of preventing flameout is better while ensuring the gas output velocity.

[0019] In the center burner cap of this direct injection burner, a guide protrusion is formed on the bottom of the top extending towards the gas chamber, and the guide protrusion has an inclined guide circumferential surface.

[0020] In a direct-injection burner, the nozzle faces upwards directly into the gas chamber. The upward-rushing mixed gas flow impacts the top wall and is then deflected before flowing out through the flame outlet on the side wall, especially in the upper gas outlet channel. During this process, the kinetic energy of the gas flow is lost, which may lead to a decrease in the velocity of the mixed gas exiting the flame outlet, a reduction in gas volume, a smaller flame, a lower temperature, and the generation of flue gas. By setting a guide protrusion, the gas is guided along the inclined guide circumference towards the gas outlet channel, reducing the loss of kinetic energy of the gas flow, ensuring the gas outlet velocity and volume, and improving the combustion effect and efficiency.

[0021] In the central burner of this direct injection burner, the waste liquid chamber is in the shape of a cone or frustum, which is smaller at the bottom and larger at the top.

[0022] Because the air outlet channel in this design is inclined, if the concave waste liquid chamber is cylindrical or similar in shape, the distance between the bottom of the waste liquid chamber and the uppermost air outlet channel is limited, making it impossible to make the waste liquid chamber deep. However, by using a conical or frustum-shaped design, the outer periphery of the waste liquid chamber can be aligned with the direction of the air outlet channel, allowing the waste liquid chamber to be made deeper, increasing the capacity, reducing the cleaning frequency, and at the same time, the upper surface area of ​​the waste liquid chamber can be made larger, fully covering the nozzle area and further preventing waste liquid from falling into the nozzle.

[0023] In the central burner cap of this direct injection burner, a drainage channel is provided at the top edge, which connects the waste liquid chamber and the outside of the burner cap. When the waste liquid chamber is full, the waste liquid can flow out from the drainage channel and through a preset path on the outer peripheral wall of the side wall, instead of overflowing from all directions.

[0024] In the central burner cap of this direct injection burner, the bottom end of the seat is provided with an annular base, which forms an inner step and an outer step with the seat. The inner step and outer step formed by the base and the seat facilitate assembly and adaptation with the burner.

[0025] Compared with existing technologies, the advantages of the center burner of this direct injection burner are: First, by further improving the top and extending it inward, the overall structure is formed in one piece, eliminating the need for additional waste liquid containment components, thus simplifying the structure.

[0026] Secondly, by improving the structure of the gas chamber, optimizing the secondary air replenishment path, improving the mixing effect of air and gas, enhancing the combustion effect and efficiency of the flame at the upper and lower exhaust gas channels, increasing the flame temperature, and reducing the generation of flue gas.

[0027] Third, by rationally setting the sidewall thickness, multiple gas outlet channels, and guide protrusions, the gas injection path is optimized, making the gas outlet speed and volume more reasonable, resulting in a shorter flame length, more stable state, higher combustion efficiency, and less smoke during combustion.

[0028] Fourth, by matching the structure of the waste liquid chamber and the gas passage, the depth of the waste liquid chamber is increased and the upper surface area of ​​the waste liquid chamber is enlarged. Even if waste liquid falls into the upper exhaust gas passage, the waste liquid will slide down along the inner wall of the arc-shaped part after passing through the exhaust gas passage, instead of dripping directly onto the nozzle, further improving the anti-clogging effect. Attached Figure Description

[0029] Figure 1 This is a perspective view of the center burner cap of the direct injection burner provided by the present invention.

[0030] Figure 2 This is a top view of the center burner cap of the direct injection burner provided by the present invention.

[0031] Figure 3 This is a cross-sectional view of the center burner cap of the direct injection burner provided by the present invention.

[0032] Figure 4 This is a cross-sectional view of the center burner cap of the direct injection burner provided by the present invention.

[0033] In the figure, 1 is the side wall; 11 is the air outlet channel; 13 is the seat; 14 is the air outlet; 2 is the top; 21 is the waste liquid chamber; 22 is the guide protrusion; 221 is the guide circumference; 23 is the diversion groove; 3 is the gas chamber; 31 is the inclined part; 32 is the arc-shaped part; 4 is the base; 41 is the inner step; 42 is the outer step. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] like Figure 1-3 As shown, a central burner cap for a direct-injection burner includes a side wall 1 and a top 2. The side wall 1 and top 2 cooperate to form a combustion chamber 3. The top 2 extends inward to form a waste liquid chamber 21. The bottom and periphery of the waste liquid chamber 21 are closed, and the entire structure is integrally formed, eliminating the need for additional waste liquid containment components, thus simplifying the structure. A drainage groove 23 is provided at the edge of the top 2, connecting the waste liquid chamber 21 and the outside of the burner cap. In actual use, the oil slides along the curved cookware to the bottom of the cookware. At this time, the bottom of the cookware is above the waste liquid chamber 21, and the oil falls into the waste liquid chamber 21 after dripping down, thus containing the waste liquid without it falling into the combustion chamber 3. Only the waste liquid chamber 21 needs to be cleaned periodically. The outer peripheral wall of the side wall 1 is provided with several exhaust channels 11. The side wall 1 has exhaust channels 11 that connect the exhaust channels 11 and the combustion chamber 3. The exhaust channels 11 are inclined in the axial direction. When in use, the gas in the exhaust channels 11 is sprayed out in the inclined direction, and the flame will be further deviated from the top 2 to avoid contact with the top 2 and affecting the combustion efficiency and combustion effect. Furthermore, the waste liquid chamber 21 is a cone or frustum shape with a smaller bottom and a larger top. The orientation of the outer peripheral surface of the cone or frustum-shaped waste liquid chamber 21 is adapted to the orientation of the exhaust channels 11, which allows the waste liquid chamber 21 to be made deeper, increasing the capacity and reducing the cleaning frequency.

[0036] As a preferred embodiment, the sidewall 1 includes a seat 13 and an air outlet 14. An air outlet channel 11 is disposed on the air outlet 14. The outer peripheral wall of the air outlet 14 is inclined towards the center and is in the shape of a frustum with a larger bottom and a smaller top. The inclined and layered air outlet channels 11 do not overlap in the horizontal projection, which facilitates the diffusion of the ejected flame and also plays a role in stabilizing the flame. In addition, the inclined outer peripheral wall of the air outlet 14 can be provided with more rows of air outlet channels 11 without changing the height of the air outlet 14. The porous design results in a shorter flame during combustion, avoiding incomplete combustion caused by uneven local temperature due to overlap with the flames of other burners in the outer ring, and reducing the generation of flue gas during combustion. When the dripping waste liquid falls into the gas outlet channel 11, the component of gravity acting on the waste liquid in the inclined gas outlet channel 11 can continue to act along the axis, making it easier to overcome the surface tension of the waste liquid and the adhesion of the inner wall of the channel to the waste liquid, thus pushing the liquid out. An annular base 4 is provided at the bottom of the seat 13. The base 4 and the seat 13 form an inner step 41 and an outer step 42, which facilitates connection with the burner.

[0037] Furthermore, such as Figure 4 As shown, the gas chamber (3) includes an inclined portion (31) and an arc-shaped portion (32) located above the inclined portion (31). The shape of the gas chamber 3 is defined by the inner peripheral wall of the side wall 1. The inclined portion 31 is a cone shape with a smaller top and a larger bottom, and the arc-shaped portion 32 is an outwardly convex arc shape. The inclined portion (31) and the arc-shaped portion (32) are integrally formed. The upper exhaust gas passage (11) is connected to the arc-shaped portion (32), and the lower exhaust gas passage (11) is connected to the inclined portion (31). When air is replenished into the gas chamber 3 for the second time, the air flows smoothly along the inclined surface of the side wall 1. The upper part can be fully mixed with the gas to ensure the combustion effect of the flame at the lower exhaust channel 11. As for the upper exhaust channel 11, the hole at the lower end of the exhaust channel 11 connects to the top surface of the arc-shaped structure of the arc-shaped part 32, which is equivalent to changing the angle between the exhaust channel 11 and the tangent of the inner peripheral wall of the side wall 1. At the same time, the arc-shaped part 32 plays a guiding role, optimizing the secondary air replenishment path, improving the mixing effect of air and gas, thereby improving the combustion effect and combustion efficiency of the flame at the upper exhaust channel 11, increasing the flame temperature, and reducing the generation of flue gas.

[0038] As a preferred embodiment, the angle α between the outlet channel 11 and the horizontal plane is 45°-50°. When the direct-injection burner nozzle injects gas upwards into the gas chamber 3, the gas diffuses outwards. When the angle α between the outlet channel 11 and the horizontal plane is 45°-50°, the angle of the outlet channel 11 is closest to the angle of gas diffusion, allowing the gas to directly enter the outlet channel 11, reducing kinetic energy loss due to turning. The gas exiting the outlet channel 11 has a faster velocity, a larger gas volume, and a higher combustion temperature. Simultaneously, the gas velocity being greater than the combustion velocity also prevents backfire. Since the direct-injection burner has a relatively fast gas velocity, to prevent flameout due to excessively high gas velocity, the wall thickness of the side wall 1 can be increased. When the wall thickness of the side wall 1 is 6-7mm, the effect of preventing flameout is better while maintaining the gas velocity.

[0039] As a preferred embodiment, the bottom of the top 2 extends towards the gas chamber 3 to form a flow guide protrusion 22. The flow guide protrusion 22 has an inclined flow guide circumferential surface 221. By setting the flow guide protrusion 22, the gas is guided towards the gas outlet channel 11 along the inclined flow guide circumferential surface 221, reducing the loss of gas kinetic energy, ensuring the gas outlet speed and gas outlet volume, and improving the combustion effect and combustion efficiency.

[0040] The specific embodiments described herein are merely illustrative examples of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the invention or exceeding the scope defined by the appended claims.

[0041] Although this document uses a considerable amount of technical terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would be contrary to the invention.

Claims

1. A central burner cap for a direct-injection burner, comprising a side wall (1) and a top (2), wherein the side wall (1) and the top (2) cooperate to form a combustion chamber (3) inside, and the side wall (1) is provided with a plurality of rows of gas outlet channels (11) connecting the combustion chamber (3) and the outside of the burner cap, the gas outlet channels (11) being inclined in the axial direction, characterized in that: The top (2) is recessed to form a waste liquid cavity (21), and the bottom and circumferential surfaces of the waste liquid cavity (21) are closed. The gas chamber (3) includes an inclined portion (31) and an arc-shaped portion (32) located above the inclined portion (31). The upper exhaust gas passage (11) is connected to the arc-shaped portion (32), and the lower exhaust gas passage (11) is connected to the inclined portion (31).

2. The center burner cap of the direct injection burner according to claim 1, characterized in that, The side wall (1) includes a seat (13) and an air outlet (14). An air outlet channel (11) is provided on the air outlet (14). The outer peripheral wall of the air outlet (14) is inclined towards the center and is in the shape of a frustum with a larger bottom and a smaller top.

3. The center burner cap of the direct injection burner according to claim 1 or 2, characterized in that, The angle α between the air outlet channel (11) and the horizontal plane is 45°-50°.

4. The center burner cap of the direct injection burner according to claim 1 or 2, characterized in that, The wall thickness of the sidewall (1) is 6-7 mm.

5. The center burner cap of the direct injection burner according to claim 1 or 2, characterized in that, The bottom of the top (2) extends toward the gas chamber (3) to form a flow guide protrusion (22), and the flow guide protrusion (22) has an inclined flow guide circumferential surface (221).

6. The center burner cap of the direct injection burner according to claim 5, characterized in that, The waste liquid chamber (21) is cone-shaped or frustum-shaped with a smaller bottom and a larger top.

7. The center burner cap of the direct injection burner according to claim 1, characterized in that, The top (2) edge is provided with a drainage channel (23), which connects the waste liquid chamber (21) and the outside of the fire cover.

8. The center burner cap of the direct injection burner according to claim 1 or 2, characterized in that, The bottom end of the seat (13) is provided with an annular base (4), and the base (4) and the seat (13) form an inner step (41) and an outer step (42).

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