A fire cover for a gas stove

Abstract

The present invention relates to a fire cover for a gas stove, comprising a fire cover body, an air mixing chamber is formed between the annular top wall of the fire cover body and the inner annular wall and the outer annular wall extending vertically or obliquely downward from the inner edge and the outer edge of the annular top wall, an ignition channel is radially arranged on the annular top wall of the fire cover body, the ignition channel is provided with an air inlet hole connected to the air mixing chamber, and the characteristic is that: the inner annular wall is below the inner opening of the ignition channel and extends toward the center of the fire cover body to form an ignition platform with a U-shaped cross section. Compared with the prior art, the advantage of the present invention is that the gas on the ignition platform is easy to enter the explosion range of the gas due to sufficient air, and a similar explosion effect is formed after ignition, and the fire transmission speed is fast; at the same time, the convex edge of the ignition platform can effectively prevent the gas in the ignition channel from being diluted by cold air from the outside, thereby ensuring the gas concentration of the ignition platform.

Description

Technical Field

[0001] The invention relates to a burner of a gas stove, in particular to a fire cover for a gas stove. Background Art

[0002] At present, most of the traditional burner fire covers sold on the market are milled with a groove, that is, an ignition groove is milled on the top of the fire cover body. Since the fire cover body of this burner fire cover is disconnected at the ignition groove, it is easy to cause the fire cover body to deform, thereby affecting the ignition effect. For example, a Chinese invention patent with patent number 201220464214.0 (publication number CN202813375U) "Gas burner head with fire transmission device and flameout protection function" discloses a similar fire transmission structure, which has a plurality of outer ring fire spraying holes on the outer ring fire spraying ring, and an outer ring fire transmission device is also provided on the outer ring fire spraying right. The outer ring fire transmission device is composed of a ignition platform installed on the inner side wall of the outer ring fire spraying ring, outer ring fire transmission holes and an outer ring provided on the ignition platform and the outer ring fire spraying ring. The outer ring fire transfer groove is composed of the outer ring fire transfer hole and the outer ring fire transfer groove, and the outer ring fire transfer hole and the outer ring fire transfer groove are connected with an outer ring flame hole, which can realize rapid fire transfer; the fire transfer groove of the fire transfer structure is open, and the fire transfer is linear, that is, the fire transfer groove is exposed on the surface of the outer ring fire cover. This design has an advantage that the secondary air supply in the fire transfer groove is very sufficient. The open fire transfer groove can ensure the secondary air supply when the flame in the fire transfer groove is burning, which is beneficial to flame combustion and fire transfer, and has the advantages of rapid fire transfer. The open type fire transmission groove has the characteristics of high speed, but the open type fire transmission groove has two disadvantages: 1. It is easy to cause the fire transmission groove to be blocked, that is, the soup flowing from the bottom of the pot can easily flow into the fire transmission groove, which will affect the fire transmission performance after being blocked. This is also the main reason for the current fire transmission groove blockage and maintenance; 2. The open type fire transmission groove has very high requirements for the air door of the stove, because when the air door is opened wide, the excessive amount of air at one time will cause the air flow speed to be too large, so that the gas at the ignition port of the fire transmission groove is diluted and causes flame separation or flame failure during combustion. Therefore, the structural characteristics of the open type fire transmission groove are poor flame stability. Therefore, to ensure the fire transmission performance of the open type fire transmission groove, the air door is basically closed very small, but closing the air door is not conducive to the combustion efficiency of the stove, nor is it conducive to the emission of smoke, which greatly affects the performance of the stove; and the other hidden type fire transmission groove is easy to lack of oxygen inside the fire transmission channel, and cannot achieve stable combustion, and there will be uninterrupted backfire explosion phenomenon, which will cause fear to users. For this reason, it is necessary to further improve the fire transmission groove of the burner fire cover. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide a fire cover for a gas stove which can effectively ensure the success rate of ignition.

[0004] The second technical problem to be solved by the present invention is to provide a fire cover for a gas stove which can effectively ensure stable fire transmission, and is particularly suitable for hidden fire transmission.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the fire cover for a gas stove includes a fire cover body, an air mixing chamber is formed between the annular top wall of the fire cover body and the inner and outer annular walls extending vertically or obliquely downward from the inner and outer edges of the annular top wall, an ignition channel is radially provided on the annular top wall of the fire cover body, the ignition channel has an air inlet hole connected to the air mixing chamber, and is characterized in that: the inner annular wall is below the inner opening of the ignition channel and extends toward the center of the fire cover body to form an ignition platform with a U-shaped cross section.

[0006] The ignition channel can be an open ignition channel or a hidden ignition channel. Preferably, the ignition channel is an ignition hole. The ignition hole is hidden, and the air and gas flowing out of the air inlet are relatively fast, while the air and gas flowing out of the inner opening can appropriately slow down the speed of the air and gas when flowing along the ignition platform. At the same time, the gas volume of the ignition platform is increased to ensure the success rate of ignition.

[0007] In order to slow down the gas outlet speed, the inner opening of the ignition hole has an inclined end surface, the top of the inclined end surface is closer to the center of the fire cover body than the bottom, and the angle α formed between the connecting line of the top and bottom of the inclined end surface and the ignition platform is an acute angle. The inclined end surface can increase the flow path of gas and air on the one hand, and prevent overflow from entering the ignition hole on the other hand.

[0008] Since the ignition channel is a hidden ignition hole, on the one hand, the air door can be opened wider, so that the amount of primary air entering the air inlet hole increases and the speed becomes faster, so that more secondary air can be sucked into the ignition hole. After the gas, primary air and secondary air are mixed into a mixed gas, they can directly collide with the top of the hole wall of the inner opening of the ignition hole, thereby improving the mixing uniformity of the gas and air in the mixed gas, while reducing the flow rate and improving the flame stabilization performance. If the angle is too large, it is easy to cause the area where the mixed gas collides with the top of the inner opening of the ignition hole to be too small. If the angle is too small, it is easy to cause the path of the primary air entering the air inlet hole to be too long, which is not conducive to the suction of secondary air. Preferably, the size of the angle α is 45°≤α≤80°.

[0009] Furthermore, the top of the hole wall of the inner opening of the ignition hole is partially provided with a notch. The notch design can strengthen the suction effect on the outside air, increase the air supply speed, and make the outside air supply faster.

[0010] Preferably, the notch is in a transverse "V" shape. The middle tip of the V shape faces the outer ring wall, which can effectively reduce the fire transfer distance and make the fire transfer faster.

[0011] In order to replenish the ignition hole with sufficient secondary air, an air replenishment channel connected to the ignition hole is also included, the air inlet end of the air replenishment channel is connected to the outside, and the air outlet end of the air replenishment channel, i.e. the air inlet hole, is connected to the ignition hole.

[0012] In order to ensure the uniformity of gas distribution in the ignition hole, the air inlet holes are provided with two holes, including a first air inlet hole and a second air inlet hole respectively arranged on both sides of the air supplementary channel.

[0013] Furthermore, the first air inlet hole gradually inclines upward from inside to outside.

[0014] Furthermore, the second air inlet gradually tilts upward from the outside to the inside. Since the first air inlet and the second air inlet are located on both sides of the air supplement channel and have opposite air outlet directions, under the influence of the outlet of the primary fuel gas and the primary air entering the first air inlet and the second air inlet, negative pressure can be generated at the air inlet of the air supplement channel, and more secondary air can be sucked in.

[0015] Compared with the prior art, the advantage of the present invention is that the ignition channel is suitable for both an open ignition method and a hidden ignition method, and the inner ring wall is below the inner opening of the ignition channel and extends toward the center of the fire cover body to form an ignition platform with a U-shaped cross-section. The ignition platform can shorten the fire transfer distance between the ignition channel and the inner ring fire cover, and the ignition platform has a U-shaped cross-section, which can effectively prevent the gas in the ignition channel from being diluted by the external cold air, thereby ensuring the gas concentration of the ignition platform. At the same time, the applicability of the ignition channel to the air damper opening is enhanced, that is, the fire transfer performance can be guaranteed even when the air damper opening is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an integral burner in which a fire cover is arranged on a base according to an embodiment of the present invention;

[0017] Figure 2 for Figure 1 A partial cross-sectional view of

[0018] Figure 3 for Figure 2 Relative partial cross-sectional views of;

[0019] Figure 4 for Figure 2 A magnified schematic diagram of center A. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings.

[0021] like Figures 1 to 4The fire cover for the gas stove in this embodiment includes a fire cover body 1, an annular top wall 11 of the fire cover body 1 and an inner annular wall 12 and an outer annular wall 13 extending vertically or obliquely downward from the inner edge and the outer edge of the annular top wall 11 to form a gas mixing chamber 14, an ignition channel is radially provided on the annular top wall 11 of the fire cover body 1, the ignition channel is provided with an air inlet hole connected to the gas mixing chamber 14, and the air inlet hole can be provided at the bottom of the ignition channel, the outer opening 22 of the ignition channel is located on the outer annular wall 13, the inner opening 23 of the ignition channel faces the center of the fire cover body 1, and the inner annular wall 12 is below the inner opening 23 of the ignition channel and extends toward the center of the fire cover body 1 to form an ignition platform 30 with a U-shaped cross section. The ignition channel is more preferably suitable for a hidden ignition hole 2 structure. The ignition platform 30 can shorten the fire transfer distance between the ignition hole 2 and the inner ring fire cover 40. The gas on the ignition platform 30 can easily enter the explosion range of the gas due to sufficient air, and form a similar explosion effect after ignition. The explosion flame propagates into the ignition channel, and the fire transfer speed is fast. At the same time, the ignition platform 30 can effectively prevent the gas in the ignition channel from being diluted by the external cold air, thereby ensuring the gas concentration of the ignition platform 30. In addition, the ignition channel is a hidden ignition hole 2 structure, and its applicability to the damper opening is enhanced, that is, the fire transfer performance can also be guaranteed under the condition of a large damper opening.

[0022] In order to slow down the gas outlet speed, the ignition hole 2 has an inclined end face, the top of which is closer to the center of the fire cover body 1 than the bottom, and the angle α formed by the line connecting the top and bottom of the inclined end face and the ignition platform 30 is an acute angle, while also preventing overflow from entering the ignition hole 2 through the inner opening 23.

[0023] Since the ignition channel is a hidden ignition hole 2, on the one hand, the air door can be opened wide, so that the amount of primary air entering the air inlet increases and the speed increases, so that more secondary air can be sucked into the ignition channel. After the gas, primary air and secondary air are mixed into a mixed gas, they can directly collide with the top of the inclined end face of the inner opening 23 of the ignition hole 2, which improves the mixing uniformity of the gas and air in the mixed gas, while reducing the flow rate and improving the flame stabilization performance. If the angle is too large, it is easy to cause the collision area of ​​the mixed gas with the top 231 of the inner opening 23 of the ignition hole 2 to be too small. If the angle is too small, it is easy to cause the path of the primary air entering the air inlet to be too long, which is not conducive to the suction of secondary air. Preferably, the angle α is 45°≤α≤80°, and α is 70° in this embodiment. The top 231 of the hole wall of the inner opening 23 of the ignition hole 2 also has a notch 2311. The notch 2311 design can strengthen the suction effect on the external air, increase the air supply speed, and make the secondary air supply more rapid. The notch 2311 is in a horizontal "V" shape, with the middle tip of the V facing the outer annular wall 13. The middle tip of the V facing the outer annular wall 13 can effectively reduce the distance of fire transmission, making the fire transmission faster. In order to supplement the ignition hole 2 with sufficient secondary air, an air supplement channel 3 is also included. The air supplement channel 3 can be isolated from the mixing chamber 14. The air inlet end 31 of the air supplement channel 3 is connected to the outside world, and the air outlet end of the air supplement channel 3, i.e., the air inlet 32, is connected to the ignition hole 2. At the same time, since the ignition channel is a hidden ignition hole 2, in order to ensure the uniformity of the gas distribution in the ignition hole 2, there are two air inlet holes, including a first air inlet hole 211 and a second air inlet hole 212 respectively arranged on both sides of the air supplement channel 3. The first air inlet hole 211 gradually tilts upward from the inside to the outside, and the second air inlet hole 212 gradually tilts upward from the outside to the inside. Since the first air inlet hole 211 and the second air inlet hole 212 are located on both sides of the air supplement channel and have opposite gas outlet directions, under the influence of the gas outlet of the primary gas and the primary air entering the first air inlet hole 211 and the second air inlet hole 212, negative pressure can be generated at the air inlet hole 32 of the air supplement channel 3, and then more secondary air can be sucked in. Finally, the fire cover for the gas stove optimizes the design of the hidden ignition channel structure to improve the fire transmission performance.

Claims

1. A fire cover for a gas stove, comprising a fire cover body (1), an air mixing chamber (14) being formed between an annular top wall (11) of the fire cover body (1) and an inner annular wall (12) and an outer annular wall (13) extending vertically or obliquely downward from the inner edge and the outer edge of the annular top wall (11), an ignition channel being provided radially on the annular top wall (11) of the fire cover body (1), the ignition channel being provided with an air inlet hole communicating with the air mixing chamber (14), characterized in that: The inner annular wall (12) is formed below the inner opening (23) of the ignition channel and extends toward the center of the fire cover body (1) to form an ignition platform (30) with a U-shaped cross section; the ignition channel is an ignition hole (2); the inner opening (23) of the ignition hole (2) has an inclined end face, the top end of the inclined end face is closer to the center of the fire cover body (1) than the bottom end, and the angle α formed between the line connecting the top end and the bottom end of the inclined end face and the ignition platform (30) is an acute angle; the size of the angle α is 45°≤α≤80°; the top (231) of the hole wall of the inner opening (23) of the ignition hole (2) has a notch (2311) in part; the notch (2311) is in a horizontal "V" shape.

2. The fire cover for a gas stove according to claim 1, characterized in that: It also includes an air supplement channel (3) that is in communication with the ignition hole (2), wherein an air inlet end (31) of the air supplement channel (3) is in communication with the outside, and an air outlet end of the air supplement channel (3) is an air inlet hole (32) that is in communication with the ignition hole (2).

3. The fire cover for a gas stove according to claim 2, characterized in that: There are two air inlet holes, including a first air inlet hole (211) and a second air inlet hole (212) which are respectively arranged on both sides of the air replenishment channel (3).

4. The fire cover for a gas stove according to claim 3, characterized in that: The first air inlet (211) gradually slopes upward from the inside to the outside.

5. The fire cover for a gas stove according to claim 4, characterized in that: The second air inlet (212) gradually slopes upward from the outside to the inside.

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