A fire cover for a gas stove

Abstract

The present invention relates to a fire cover for a gas stove, comprising an upper cover body, an air mixing chamber is formed between the annular top wall of the upper cover body and the inner and outer annular walls vertically or obliquely extending downward from the inner and outer edges of the annular top wall, a transverse ignition hole is radially opened inside the upper cover body, an air inlet hole connected to the air mixing chamber is opened at the bottom of the transverse ignition hole, the inner opening of the transverse ignition hole is located on the inner annular wall, and the outer opening of the transverse ignition hole is located on the outer annular wall. The invention is characterized in that it also includes an ignition channel intersecting with the transverse ignition hole, the ignition channel includes an ignition outlet opened on the annular top wall, and a first air supply channel independent of the transverse ignition hole and connected with the ignition channel. Compared with the prior art, the invention has the advantage that it is less likely to have a fire transmission failure.

Description

Technical Field

[0001] The invention relates to a household stove burner, 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 upper cover body. Since the upper cover body of this burner fire cover is disconnected at the ignition groove, it is easy to cause the upper cover body to deform, thereby affecting the ignition effect. For example, a Chinese utility model patent with patent number 201220464214.0 (publication number CN202813375U) "Gas burner with fire transmission device and flameout protection function" discloses a similar fire transmission structure, which is provided with 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 hole, and the outer ring fire transmission device is composed of a boss installed on the inner wall of the outer ring fire spraying ring, an outer ring fire transmission hole and an outer ring fire transmission groove arranged on the boss and the outer ring fire spraying ring, the outer ring fire transmission hole is connected with the outer ring fire transmission groove, the outer ring fire transmission hole and the outer ring fire transmission groove are connected with an outer ring fire spraying hole, so as to realize rapid fire transmission; the fire transmission groove of the fire transmission structure is open, and the fire transmission is linear, that is, the fire transmission groove is exposed on the surface of the outer ring fire cover. One advantage of such a design is that the secondary air supply in the fire transmission groove is very sufficient, The open fire transfer slot can ensure the secondary air supply when the flame in the fire transfer slot burns, which is conducive to flame combustion and fire transfer, and has the characteristics of fast fire transfer. However, the open fire transfer slot has two disadvantages. First, the open fire transfer slot is easy to cause the fire transfer slot to be blocked, that is, the soup flowing from the bottom of the pot is easy to flow into the fire transfer slot, and the blockage affects the fire transfer performance. This is also the main reason for the current fire transfer slot blockage and maintenance; second, the open fire transfer slot has high requirements for the stove damper, because when the damper is opened, the excessive amount of primary air will cause the air flow speed to be too high, thereby causing the flame to be separated or the fire to fall off during combustion. Therefore, the structural characteristics of the open fire transfer slot are poor flame stabilization characteristics. Therefore, to ensure the fire transfer performance of the open fire transfer slot, the damper is basically closed very small, but the damper is closed very small, which 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. For this reason, it is necessary to further improve the fire transfer slot of the burner fire cover.

[0003] To this end, a Chinese invention patent application with application number CN201710901140.X (publication number CN107461744A) discloses a fire cover, which has an inclined groove, wherein the inclined groove can connect the fire transfer hole with the outside world, which is beneficial to the air circulation in the fire transfer hole, so that the fire transfer hole has sufficient air to support the flame combustion in the fire transfer hole, and the first shielding part and the second shielding part located on both sides of the inclined groove can prevent water droplets in the combustion environment from directly dripping into the fire transfer hole or cross wind from blowing through the fire transfer hole, causing the fire transfer hole to lose its fire transfer function. However, if the inclined groove is completely blocked by overflow, the inclined groove that can connect the fire transfer hole with the outside world will cause the fire transfer of the fire transfer hole to fail. Therefore, it is necessary to further improve the fire transfer structure of the existing burner. Summary of the invention

[0004] The first technical problem to be solved by the present invention is to provide a fire cover for a gas stove which can reduce the probability of the gas inlet hole at the ignition point being blocked in view of the above-mentioned existing technical status.

[0005] The second technical problem to be solved by the present invention is to provide a fire cover for a gas stove which is conducive to air replenishment to ensure smooth fire transmission in view of the above-mentioned existing technical status.

[0006] The third 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 in view of the above-mentioned existing technical status.

[0007] In order to solve the first technical problem mentioned above, the technical solution adopted by the present invention is as follows: the fire cover for the gas stove includes an upper cover body, an air mixing chamber is formed between the annular top wall of the upper 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, a transverse ignition hole is radially opened inside the upper cover body, an air inlet hole connected to the air mixing chamber is opened at the bottom of the transverse ignition hole, the inner opening of the transverse ignition hole is located on the inner annular wall, and the outer opening of the transverse ignition hole is located on the outer annular wall, characterized in that: it also includes an ignition channel intersecting with the transverse ignition hole, the ignition channel includes an ignition outlet opened on the annular top wall, and a first air supply channel independent of the transverse ignition hole and connected to the ignition channel, the first air supply channel includes a first air inlet connected to the air mixing chamber and a first air outlet connected to the ignition channel.

[0008] To solve the second technical problem, preferably, the ignition channel is gradually inclined from top to bottom toward the first air supply channel from the ignition outlet to the air outlet of the first air supply channel. The inclined setting of the ignition channel can reduce the gas supply resistance of the first air supply channel inputting gas to the ignition channel, making the air supply smoother, and also can reduce the probability of the ignition channel being blocked.

[0009] In order to facilitate the setting of the first air supplement channel, preferably, the first air supplement channel is a vertical channel and is opened in the outer ring wall of the upper cover body.

[0010] To solve the third technical problem, preferably, a second air supply channel which is also independent of the transverse ignition hole is further included, wherein the second air supply channel includes a second air inlet connected to the gas mixing chamber and a second air outlet connected to the transverse ignition hole. In order to prevent the ignition outlet of the ignition channel and the air inlet at the bottom of the transverse ignition hole from being blocked by overflow, the transverse ignition hole still has gas supply, and the second air supply channel and the first air supply channel together play a double insurance role.

[0011] Furthermore, the second air outlet of the second air supply channel is adjacent to the ignition outlet of the ignition channel. The reason why the second air outlet of the second air supply channel is adjacent to the ignition outlet of the ignition channel is that: first, the first air supply channel is connected with the ignition channel, and the first air outlet of the first air supply channel is equivalent to the entrance of the ignition channel, that is, the first air supply channel is used to supplement the entrance of the ignition channel with gas; the second air outlet of the second air supply channel is used to supplement the gas near the ignition outlet of the ignition channel, so that the gas in the ignition channel is sufficient; second, the second air supply channel is not easily blocked by overflow liquid, even after the ignition outlet of the ignition channel is blocked by overflow liquid, the gas flowing out of the second air outlet of the second air supply channel is located at the upper part of the transverse ignition hole, so that when the gas on the upper part of the inner wall of the transverse ignition hole is ignited by the flame, the lower part of the inner wall of the transverse ignition hole can still be smoothly supplemented with secondary air, so as to form a flame in the transverse ignition hole, and finally the flame ignites the gas in the flame stabilizing groove intersecting with the transverse ignition hole, and then ignites the main fire hole above the flame stabilizing groove, and successfully completes the fire transmission process.

[0012] In order to prevent the second air supply channel from being blocked by the overflow liquid, preferably, the second air supply channel is a radial channel opened along the inner radial direction of the upper cover body.

[0013] Furthermore, a ignition platform extending from a position adjacent to the inner peripheral surface of the inner ring wall toward the center of the upper cover body is provided below the inner opening of the transverse ignition hole. The ignition platform can shorten the fire transfer distance between the ignition channel and the inner ring fire cover, and the ignition platform can effectively prevent the gas in the ignition channel from being diluted by the cold air outside, thereby ensuring the gas concentration of the ignition platform. At the same time, the ignition channel is more adaptable to the damper opening, that is, the fire transfer performance can be guaranteed even when the damper opening is large.

[0014] To facilitate the processing of the ignition platform, preferably, it includes a lower cover body located below the upper cover body, the lower cover body having at least one opening for gas to enter the mixing chamber, and the ignition platform is formed by extending toward the center of the upper cover body from the first part of the lower cover body below the inner opening corresponding to the ignition channel.

[0015] Furthermore, at least two of the openings on the lower cover body are respectively located on two sides of the first portion of the lower cover body.

[0016] Furthermore, the cross section of the ignition platform is U-shaped, which can effectively prevent the gas in the transverse ignition hole from being diluted by the cold air outside, thereby ensuring the gas concentration of the ignition platform.

[0017] In order to slow down the gas outlet speed, preferably, 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 upper 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 the gas and air on the one hand, and prevent overflow from entering the horizontal ignition hole on the other hand.

[0018] Furthermore, the angle α is 45°≤α≤80°. Since the transverse ignition hole is a hidden ignition hole, 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 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 transverse ignition hole, 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 area where the mixed gas collides with the top of the inner opening of the transverse 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 to be too long, which is not conducive to the suction of secondary air. Preferably, the angle α is 45°≤α≤80°.

[0019] In addition to being realized by using the lower cover body, the ignition platform can also be realized in the following manner: the ignition platform is directly formed by extending the inner ring wall of the upper cover body directly toward the center of the upper cover body.

[0020] Compared with the prior art, the advantage of the present invention is that it provides a fire transfer structure that combines a hidden transverse ignition hole and an open ignition channel connected to the outside world, which can improve the success rate of fire transfer, wherein a first air supply channel independent of the transverse ignition hole is used to supplement the ignition channel with fuel gas. Even if overflow flows into the transverse ignition hole through the ignition outlet of the ignition channel and blocks the air inlet, the fuel gas flowing out of the first air supply channel is located at the upper part of the transverse ignition hole, so that when the fuel gas on the upper part of the inner wall of the transverse ignition hole is ignited by the flame, the lower part of the inner wall of the transverse ignition hole can still be smoothly supplemented with secondary air, thereby forming a flame in the transverse ignition hole, and the phenomenon of fire transfer failure is not easy to occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1This is a schematic diagram of the structure in which the upper cover is placed on the base in Embodiment 1 of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the middle upper cover;

[0023] Figure 3 for Figure 2 A cross-sectional view of the middle upper cover at an angle;

[0024] Figure 4 for Figure 3 A cross-sectional view of the middle upper cover at another angle;

[0025] Figure 5 for Figure 1 A schematic diagram of the structure of the middle and lower cover bodies;

[0026] Figure 6 for Figure 1 Schematic diagram of the structure from another angle;

[0027] Figure 7 for Figure 6 sectional view of . DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] Example 1

[0030] like Figures 1 to 7Shown is the best embodiment of the present invention. The fire cover for the gas stove in this embodiment includes an upper cover body 1, and an air mixing chamber 14 is formed between the annular top wall 11 of the upper cover body 1 and the inner annular wall 12 and the outer annular wall 13 extending vertically or obliquely downward from the inner edge and the outer edge of the annular top wall 11. A transverse ignition hole 2 is radially opened inside the upper cover body 1, and an air inlet 21 connected to the air mixing chamber 14 is opened at the bottom of the transverse ignition hole 2. The inner opening 23 of the transverse ignition hole 2 is located on the inner annular wall 12, and the outer opening 24 of the transverse ignition hole 2 is located on the outer annular wall 13. It also includes an ignition channel 3 intersecting with the transverse ignition hole 2, and the ignition channel 3 includes an ignition outlet 31 opened on the annular top wall 11, and a first air supply channel 4 independent of the transverse ignition hole 2 and connected with the ignition channel 3. The first air supply channel 4 includes a first air inlet 41 connected with the air mixing chamber 14 and a first air outlet 42 connected with the ignition channel 3. Specifically, the ignition channel 3 gradually inclines from the ignition outlet 31 to the first air outlet 42 of the first air supply channel 4 from top to bottom toward the first air supply channel 4. The inclined setting of the ignition channel 3 can reduce the gas supply resistance of the first air supply channel 4 inputting the gas into the ignition channel 3, making the air supply smoother. In order to facilitate the setting of the first air supply channel 4, the first air supply channel 4 is a vertical channel and is opened in the outer ring wall 13 of the upper cover body 1. In order to effectively ensure the success rate of ignition, a second air supply channel 5 which is also independent of the transverse ignition hole 2 is also included. The second air supply channel 5 includes a second air inlet 51 connected to the gas mixing chamber 14 and a second air outlet 52 connected to the transverse ignition hole 2. In order to avoid the ignition outlet 31 of the ignition channel 3 and the air inlet 21 at the bottom of the transverse ignition hole 2 being blocked by overflow, the transverse ignition hole 2 still has gas supply. The second air supply channel 5 and the first air supply channel 4 together play a double insurance role. The second air outlet 52 of the second air supply channel 5 is adjacent to the ignition outlet 31 of the ignition channel 3. The reason why the second air outlet 52 of the second air supply channel 5 is adjacent to the ignition outlet 31 of the ignition channel 3 is that: first, the first air supply channel 4 is connected to the ignition channel 3, and the first air outlet 42 of the first air supply channel 4 is equivalent to the ignition channel 3, that is, the first air supply channel 4 is used to supplement the entrance of the ignition channel 3 with fuel gas; the second air outlet 52 of the second air supply channel 5 is used to supplement the fuel gas near the ignition outlet 31 of the ignition channel 3, so that the fuel gas in the ignition channel 3 is sufficient; second, the second air supply channel 5 is not easily blocked by overflow liquid. Even after the ignition outlet 31 of the ignition channel 3 is blocked by overflow liquid, the fuel gas flowing out of the second air outlet 52 of the second air supply channel 5 is located at the upper part of the horizontal ignition hole 2, so that when the fuel gas on the upper part of the inner wall of the horizontal ignition hole 2 is ignited by the flame, the lower part of the inner wall of the horizontal ignition hole 2 can still be smoothly supplemented with secondary air, so as to form a flame in the horizontal ignition hole 2, and finally the flame ignites the fuel gas in the flame stabilizing groove 101 intersecting with the horizontal ignition hole 2, and then ignites the main fire hole 10 above the flame stabilizing groove 101, and successfully completes the fire transfer process.In order to prevent the second air supply channel 5 from being blocked by the overflow, the second air supply channel 5 is a radial channel opened along the inner radial direction of the upper cover body 1. The fire transmission structure that combines the hidden transverse ignition hole 2 and the open ignition channel 3 connected to the outside can improve the success rate of fire transmission, wherein the first air supply channel 4 independent of the transverse ignition hole 2 is used to supplement the ignition channel 3 with gas, even if the overflow enters the transverse ignition hole 2 through the ignition channel 3 and blocks the air inlet 21, the gas flowing out of the first air supply channel 4 and the second air supply channel 5 is located at the upper part of the transverse ignition hole 2, so that when the gas on the upper part of the inner wall of the transverse ignition hole 2 is ignited by the flame, the lower part of the inner wall of the transverse ignition hole 2 can still be smoothly supplemented with secondary air, thereby forming a flame in the transverse ignition hole 2, and the phenomenon of fire transmission failure is not easy to occur.

[0031] In addition, the position below the inner opening 23 of the transverse ignition hole 2 has an ignition platform 6 extending from the position of the inner peripheral surface adjacent to the inner ring wall 12 toward the center direction of the upper cover body 1. The ignition platform 6 can shorten the fire transmission distance between the ignition channel 3 and the inner ring fire cover, and the ignition platform 6 can effectively prevent the gas in the ignition channel 3 from being diluted by the cold air outside, ensuring the gas concentration of the ignition platform 6. At the same time, the applicability of the ignition channel 3 to the air damper opening is enhanced, that is, the fire transmission performance can also be guaranteed under the condition of a large air damper opening. In order to facilitate the processing of the ignition platform 6, it includes a lower cover body 7 located below the upper cover body 1, and the lower cover body 7 has at least one opening 71 for gas to enter the gas mixing chamber 14. The ignition platform 6 is formed by the first part of the lower cover body 7 corresponding to the inner opening 23 of the ignition channel 3 extending toward the center of the upper cover body 1. At least two of the openings 71 on the lower cover body 7 are located on both sides of the first part of the lower cover body 7. Preferably, the cross section of the ignition platform 6 is U-shaped, which can effectively prevent the gas in the horizontal ignition hole 2 from being diluted by the cold air outside, thereby ensuring the gas concentration of the ignition platform 6. In order to slow down the gas outlet speed, the inner opening 23 of the ignition hole has an inclined end face 231, the top of which is closer to the center of the upper cover body 1 than the bottom, and the angle α formed between the line connecting the top and bottom of the inclined end face 231 and the ignition platform 6 is an acute angle. The inclined end face 231 can increase the flow path of the gas and air on the one hand, and prevent the overflow from entering the horizontal ignition hole 2 on the other hand. The size of the angle α is 45°≤α≤80°. In this embodiment, the size of the angle α is 60°. Since the transverse ignition hole 2 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 is increased and the speed becomes faster, so that more secondary air can be sucked into the ignition hole. After the fuel 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 23 of the transverse ignition hole 2, thereby improving the mixing uniformity of the fuel 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 23 of the transverse 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 hole to be too long, which is not conducive to the suction of secondary air.

[0032] refer to Figure 3 and Figure 4 , the above-mentioned fire transmission path is:

[0033] ① The gas enters from the gas mixing chamber 14 through the first gas inlet 41 of the first gas supplement channel 4, and the gas in the first gas supplement channel 4 enters the ignition outlet 31 of the ignition channel 3 along the top surface of the transverse ignition hole 2;

[0034] ② The gas enters from the gas mixing chamber 14 through the second gas inlet 51 of the second gas supply channel 5, and the gas in the second gas channel enters the ignition channel 3 along the inner wall of the transverse ignition hole 2; for this reason, the gas in the first gas supply channel 4 and the second gas supply channel 5 eventually flows to the ignition channel 3, which plays a double insurance role. The gas in the ignition channel 3 is ignited by the flame on the inner ring fire cover 8 of the burner, and then the entire transverse ignition hole 2 has a flame, thereby igniting the main fire hole 10 on the upper cover body 1. The fire transfer state at this time is open fire transfer, but it is different from the traditional open fire transfer, because at this time the ignition channel 3 close to the external environment can catch fire, and the transverse ignition hole 2 can also catch fire. The dual path is more reliable than the traditional open fire transfer.

[0035] ③ After a long period of use of the gas stove, in case the entire seam of the ignition channel 3 is blocked, the gas flowing out of the second air outlet 52 of the second air supply channel 5 is located at the upper part of the horizontal ignition hole 2, so that when the gas on the upper part of the inner wall of the horizontal ignition hole 2 is ignited by the flame, the lower part of the inner wall of the horizontal ignition hole 2 can still be smoothly supplemented with secondary air, thereby forming a flame in the horizontal ignition hole 2, and finally the flame ignites the gas in the flame stabilizing groove 101 intersecting with the horizontal ignition hole 2, and then ignites the main fire hole 10 above the flame stabilizing groove 101, successfully completing the fire transfer process.

[0036] Example 2

[0037] The structure is the same as that of the embodiment 1, except that the ignition platform 6 is directly formed by the inner annular wall 12 of the upper cover body 1 extending directly toward the center of the upper cover body 1 .

Claims

1. A fire cover for a gas stove, comprising an upper cover body (1), an air mixing chamber (14) being formed between an annular top wall (11) of the upper 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), a transverse ignition hole (2) being radially opened inside the upper cover body (1), an air inlet hole (21) communicating with the air mixing chamber (14) being opened at the bottom of the transverse ignition hole (2), an inner opening (23) of the transverse ignition hole (2) being located on the inner annular wall (12), and an outer opening (24) of the transverse ignition hole (2) being located on the outer annular wall (13), characterized in that: It also includes an ignition channel (3) intersecting with the transverse ignition hole (2), the ignition channel (3) including an ignition outlet (31) opened on the annular top wall (11), and a first air supply channel (4) independent of the transverse ignition hole (2) and intersecting with the ignition channel (3), the first air supply channel (4) including a first air inlet (41) connected to the gas mixing chamber (14) and a first air outlet (42) connected to the ignition channel (3); The ignition channel (3) gradually inclines from the ignition outlet (31) to the first air outlet (42) of the first air supply channel (4) from top to bottom toward the first air supply channel (4); The first air supply channel (4) is a vertical channel and is opened in the outer annular wall (13) of the upper cover body (1); It also includes a second air supply channel (5) which is also independent of the transverse ignition hole (2), and the second air supply channel (5) includes a second air inlet (51) connected to the air mixing chamber (14) and a second air outlet (52) connected to the transverse ignition hole (2); A position below the inner opening (23) of the transverse ignition hole (2) has an ignition platform (6) extending from a position adjacent to the inner circumferential surface of the inner annular wall (12) toward the center of the upper cover body (1).

2. The fire cover for a gas stove according to claim 1, characterized in that: The second air outlet (52) of the second air supplement channel (5) is adjacent to the ignition outlet (31) of the ignition channel (3).

3. The fire cover for a gas stove according to claim 2, characterized in that: The second air supply channel (5) is a radial channel opened along the inner radial direction of the upper cover body (1).

4. The fire cover for a gas stove according to claim 1, characterized in that: The invention comprises a lower cover body (7) located below the upper cover body (1), the lower cover body (7) having at least one opening (71) for allowing fuel gas to enter the gas mixing chamber (14), and the ignition platform (6) is formed by extending from the first part of the lower cover body (7) below the inner opening (23) corresponding to the ignition channel (3) toward the center of the upper cover body (1).

5. The fire cover for a gas stove according to claim 4, characterized in that: At least two of the openings (71) on the lower cover body (7) are located respectively on two sides of the first part of the lower cover body (7).

6. The fire cover for a gas stove according to claim 4 or 5, characterized in that: The cross section of the ignition platform (6) is U-shaped.

7. The fire cover for a gas stove according to claim 6, characterized in that: The inner opening (23) of the transverse ignition hole (2) has an inclined end surface (231), the top end of the inclined end surface (231) is closer to the center of the upper cover body (1) than the bottom end, and the angle α formed by the line connecting the top end and the bottom end of the inclined end surface (231) and the ignition platform (6) is an acute angle.

8. The fire cover for a gas stove according to claim 7, characterized in that: The angle α is 45°≤α≤80°.

9. The fire cover for a gas stove according to claim 1, characterized in that: The ignition platform (6) is formed by extending directly from the inner annular wall (12) of the upper cover body (1) toward the center of the upper cover body (1).

Images