A fire cover for a gas hob

Abstract

The application relates to a fire cover for a gas stove, which comprises a fire cover body, a ring-shaped top wall of the fire cover body, an inner ring wall and an outer ring wall vertically or obliquely downward extending from inner and outer side edges of the ring-shaped top wall and forming a gas mixing cavity, characterized in that the outer ring wall is connected with the ring-shaped top wall through interval arranged partition blocks in the circumferential direction, the partition blocks are provided with communicating holes communicating with the gas mixing cavity, and the outer ring wall and the outer side edge of the ring-shaped top wall are formed with annular gaps communicating with the gas mixing cavity through the partition blocks, and each partition block is arranged below the annular gap. Compared with the prior art, the application has the advantages that the annular gap can make the fire cover body have better flame stabilizing effect, and at least two partition blocks are arranged below the annular gap, and the partition blocks are provided with communicating holes communicating with the annular gap and the gas mixing cavity, so that the communicating holes can play the role of flame transmission between the annular gaps, and flame transmission and flame stabilizing are more efficient and stable.

Description

TECHNICAL FIELD

[0001] The present application relates to a burner of a gas stove, in particular to a fire cover for a gas stove. BACKGROUND

[0002] The fire holes of the existing atmospheric burners are roughly divided into round fire holes, square fire holes and strip-shaped fire holes. The round fire holes and the strip-shaped fire holes are machined, and in order to ensure the thermal intensity of the fire holes, dozens of fire holes are needed on a single fire cover, which has the problems of low production efficiency, large material waste, high processing cost and the like. The square fire holes are generally forged, but since there are many fire holes and there are tolerance requirements, the mold precision is high, the mold is complex and has a short service life. In addition, the above-mentioned fire holes are all independent small holes, and there is also the pain point that it is not easy to clean after being blocked. The existing burners use ring-shaped fire holes to solve the problem of high processing cost of round fire holes, square fire holes and strip-shaped fire holes, but the ring-shaped fire hole passages are arranged on the top surface of the fire cover and the fire hole angle is 90°, which has the technical defects that the secondary air is difficult to supplement and the flames between adjacent ring-shaped fire holes are easy to cross and interfere, which can cause problems such as yellow flame, unqualified CO content, low thermal efficiency, and the structure also has the problem that the dirt is easy to block the fire holes. Therefore, the applicant has applied for a Chinese utility model patent with the patent number ZL202022037245.5 (the authorized announcement number is CN213777719U) “a fire cover for a gas stove”, which comprises a ring-shaped body, a ring-shaped top wall of the body and an inner ring wall and an outer ring wall vertically or obliquely downwardly extending from the inner side edge and the outer side edge of the ring-shaped top wall form a gas mixing cavity, characterized in that: the outer ring wall and the lower ring body form a first fire outlet gap, and the recess and the partition block form a second fire outlet gap, the ring-shaped body and the lower ring body of the fire cover form the first fire outlet gap and the second fire outlet gap which are arranged in the circumferential direction, so that the ring gap fire is continuous and uninterrupted in the circumferential direction, the bottom of the pot is heated more uniformly, and fire hole blockage is less likely to occur. At present, high fire hole intensity of the fire cover has become an inevitable trend, especially for the ring gap fire cover, under high load intensity, plus primary air blowing, the gas flow velocity at the fire hole is extremely fast, and it is extremely easy to have problems such as flame separation, fire transmission difficulty and low ignition success rate, therefore, the flame stabilizing structure of the ring gap fire cover needs to be further researched.

[0003] In addition, most of the conventional burner fire covers sold on the market are milled through a groove, that is, a fire guide groove is milled on the top of the fire cover body. Due to the fact that the fire cover body is disconnected at the fire guide groove, the fire cover body is easily deformed, thereby affecting the fire guide effect. For example, a Chinese patent No. 201220464214.0 (publication No. CN202813375U) discloses a similar fire guide structure, which is provided with a plurality of outer ring fire holes in the outer ring fire ring, and is further provided with an outer ring fire guide device on the outer ring fire hole. The outer ring fire guide device is composed of a fire guide platform arranged on the inner side wall of the outer ring fire ring, an outer ring fire guide hole and an outer ring fire guide groove arranged on the fire guide platform and the outer ring fire ring. The outer ring fire guide hole is in communication with the outer ring fire guide groove, and the outer ring fire guide hole and the outer ring fire guide groove are in communication with an outer ring fire hole, so as to realize rapid fire guide. The fire guide groove of the fire guide structure is open, and the fire guide is in a straight line type, that is, the fire guide groove is exposed on the surface of the outer ring fire cover. This design has an advantage that the supply of secondary air in the fire guide groove is sufficient. The open fire guide groove can ensure the supply of secondary air when the flame in the fire guide groove burns, which is beneficial to the flame burning and fire guide, and has the characteristics of rapid fire guide.

[0004] However, the open fire guide groove has two disadvantages: first, it is easy to cause the fire guide groove to be blocked, that is, the soup flowing from the bottom of the pot easily flows into the fire guide groove, which affects the fire guide performance after being blocked, which is also the main reason for the current fire guide groove blockage repair; second, the open fire guide groove has high requirements for the damper of the stove. Because the damper is opened, too much primary air will cause the gas flow speed to be too large, so that the gas at the fire guide opening of the fire guide groove is diluted, thereby causing the flame to be separated or extinguished during combustion. Therefore, the structure characteristics of the open fire guide groove are poor in flame stability. Therefore, the fire guide groove of the burner fire cover needs to be further improved. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide a fire cover for a gas stove which can improve the flame stability of the ring gap fire cover.

[0006] The second technical problem to be solved by the present application is to provide a fire cover for a gas stove which can effectively ensure the success rate of fire guide.

[0007] The technical scheme adopted by the present application to solve the first technical problem is: the fire cover for the gas stove comprises a fire cover body, a mixing cavity is formed between the annular top wall of the fire cover body and the inner ring wall and the outer ring wall extending vertically or obliquely downward from the inner side edge and the outer side edge of the annular top wall, and the outer ring wall is connected with the annular top wall through the partition blocks arranged at intervals in the circumferential direction, the partition blocks are provided with the communication holes communicating with the mixing cavity, and the annular gap communicating with the mixing cavity is formed between the outer side edge of the outer ring wall and the annular top wall through each partition block, and each partition block is arranged below the annular gap.

[0008] In order to realize the flame stabilization of the fire cover body, preferably, a lower ring body is further arranged below the fire cover body, the lower ring body comprises a transverse part for supporting the fire cover body and a vertical part arranged at the periphery of the outer ring wall, the gap between the vertical part and the outer ring wall constitutes a flame stabilization cavity for stabilizing the annular gap, and the lower part of the outer ring wall is provided with a communication part communicating the flame stabilization cavity and the mixing cavity. After the mixed gas composed of the fuel gas and the primary air in the mixing cavity enters the flame stabilization cavity through each communication part, the mixed gas first enters the vertical gap formed between the vertical part and the outer ring wall to play a role of buffering and reducing the speed of the mixed gas before flowing out of the combustion, and the flow rate of the mixed gas is slow and located below the annular gap, so that the mixed gas can "pull" the flame out of the annular gap to play a buffering and reducing effect.

[0009] In order to realize the further buffering and reducing of the mixed gas in the mixing cavity after entering the flame stabilization cavity, preferably, the transverse part has an inner step, the outer ring wall is arranged on the first wall surface above the inner step, the second wall surface below the inner step constitutes the bottom of the mixing cavity, and the communication part is a downward opening notch. Among them, the mixed gas composed of the fuel gas and the primary air in the mixing cavity first flows along the first wall surface above the inner step in the vertical direction to lengthen the flow path of the mixed gas to reduce the flow rate of the mixed gas to constitute the first stage of flame stabilization, and then the second stage of flame stabilization is realized through the notch in the lower part of the outer ring wall.

[0010] In order to realize the flame stabilization of the flame stabilization cavity, preferably, the top part of the vertical part of the lower ring body is provided with at least two flame stabilization grooves arranged at intervals in the circumferential direction at the position adjacent to the annular gap. The setting of the flame stabilization grooves enables the mixed gas composed of the fuel gas and the primary air to further stabilize when flowing out of the flame stabilization cavity to constitute the third stage of flame stabilization.

[0011] In order to realize the further stabilization of the mixed gas composed of the fuel gas and the primary air after passing through the flame stabilization groove, preferably, the flame stabilization groove comprises a flared section gradually expanding along the direction of the fuel gas flowing out. The flared section can reduce the flow rate of the fuel gas, so that the fuel gas flowing out of the flame stabilization groove is not easy to separate from the flame when burning.

[0012] To achieve the flared section of the flame stabilizing groove to further stabilize the mixed gas, preferably, the outer ring wall of the fire cover body is radially inwardly tapered, the outer side end of the outer ring wall is closer to the vertical part than the outer ring wall, the flared section has an inclined slope with an angle α formed with the outer side end of the outer ring wall, and 30°≤α≤45°. Since the inclined slope can reduce the opening of the annular gap for flame stabilization and the outer side end of the outer ring wall, the turning in the annular gap is caused, the gas flow rate is reduced, the mixed gas flowing out of the flame stabilizing groove is not easy to flame out during combustion, and the entire burner is stable during combustion to form the fourth stage of flame stabilization.

[0013] To solve the second technical problem, the annular top wall of the fire cover body is provided with a fire leading channel in the radial direction, the fire leading channel is provided with an air inlet hole communicating with the mixed gas chamber, and the outer side opening of the fire leading channel is a notch corresponding to the notch provided in the outer side end of the outer ring wall, and the notch communicates with the flame stabilizing chamber. Since the flame stabilizing chamber can stabilize the flame of the fire cover body, and since the outer side opening of the fire leading channel is communicated with the flame stabilizing chamber through the notch of the outer ring wall, even if the air outlet speed of the air inlet hole of the fire leading channel is too fast, the fire leading of the fire leading channel can be well stabilized, thereby improving the success rate of fire leading, and the applicability of the fire leading channel to the damper opening is enhanced, that is, the fire leading performance can be ensured under the condition that the damper opening is large.

[0014] To achieve the fifth stage of flame stabilization, preferably, along the direction of gas flow, the transverse part is provided with a flame stabilizing part for stabilizing the notch downstream of the first wall surface of the inner step. The flame stabilizing part can further stabilize the flame after the second stage of flame stabilization, and the flame stabilizing part can make the mixed gas flowing out of the notch turn further, thereby reducing the gas flow rate.

[0015] To achieve the flame stabilizing part to make the mixed gas turn further, from the perspective of simple structure, preferably, the flame stabilizing part is a boss arranged between the outer ring wall and the first wall surface of the inner step and protruding above the first wall surface of the inner step, and the relationship between the height h1 of the boss and the height h2 of the notch is h1:h2=1:3-1:2. The limitation of the height of the boss can satisfy the mixed gas flowing out while being forced to turn, thereby further stabilizing the flame.

[0016] Further, the width of the annular gap is 1.0-1.8 mm, an included angle β is formed between the annular gap and the second wall surface below the inner step, and 10°≤β≤60°. The annular gap has the included angle β with the second wall surface, and the included angle β can make the mixed gas impact the outer side end of the outer ring wall when flowing out of the annular gap, thereby further slowing down the flow rate.

[0017] Compared with the prior art, the advantages of the present invention are that the setting of the annular seam can provide a better flame stabilization effect on the fire cover body, and at least two spacer blocks are provided under the annular seam, and each spacer block is provided with a connecting hole connecting the annular seam and the gas mixing chamber, so that the connecting hole can play a role in fire transfer between the annular seams, making the fire transfer and flame stabilization more efficient and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a fire cover according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 a cross-sectional view at an angle;

[0020] Figure 3 for Figure 1 A cross-sectional view from another angle;

[0021] Figure 4 Schematic diagram of the structure of the fire cover body in an embodiment of the present invention;

[0022] Figure 5 Schematic diagram of the structure of the lower ring body in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0024] like Figures 1 to 5 FIG. 1 is a preferred embodiment of the present invention. The fire cover for a gas stove in this embodiment includes a fire cover body 1. A gas mixing chamber 14 is 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 and outer edges of the annular top wall 11. The outer annular wall 13 and the annular top wall 11 are connected by spacers 2 arranged at intervals along the circumference. The spacers 2 are provided with communication holes 21 communicating with the gas mixing chamber 14. An annular gap 15 communicating with the gas mixing chamber 14 is formed between the outer annular wall 13 and the outer edge of the annular top wall 11 through each spacer 2. Each spacer 2 is disposed below the annular gap 15. The provision of the annular seam 15 can provide a better flame stabilization effect on the fire cover body 1, and at least two spacer blocks 2 are provided under the annular seam 15, and each spacer block 2 is provided with a connecting hole 21 connecting the annular seam 15 and the gas mixing chamber 14. In this way, the connecting hole 21 can play a role in fire transfer between the annular seams 15, making the fire transfer and flame stabilization more efficient and stable.

[0025] Because the traditional fire hole of the existing fire cover needs air supplement between the fire holes, otherwise incomplete combustion, high smoke and low thermal efficiency will be caused, but the air supplement between the fire holes also takes away heat while causing complete combustion, which results in low thermal efficiency. The gap fire formed by the annular slit 15 cancels the air supplement between the fire holes compared with the traditional circular fire hole, concentrates the gas and increases the outer flame area, thereby greatly increasing the contact area of the flame and the pot bottom, but at the same time, the air between the flames cannot be supplemented, which results in high smoke, so the pot support must be raised, thereby reducing the efficiency. The patent application innovatively adopts the annular slit sheet fire, and the width of the annular slit is controlled at 1.0-1.8mm, such as 1.5mm, and the angle β is selected as 45° in the embodiment, the included angle β can make the mixed gas impact the outside end of the outer ring wall 13 when flowing out of the annular slit 15, so as to further slow down the flow rate. Because the flame is thin, the air supplement position is changed, and the air supplement is not needed between the continuous flames, but the air supplement on the inner side or the outer side of the flame surface can be performed, thereby realizing high efficiency. But the thinner the flame is, the greater the gas flow rate is, and stronger flame stabilization and fire transmission are needed, based on this, the patent application further designs the following flame stabilization structure. Specifically, in order to realize the flame stabilization of the fire cover body 1, a lower ring body 3 is further arranged below the fire cover body 1, the lower ring body 3 includes a transverse part 31 for supporting the fire cover body 1 and a vertical part 32 arranged at the periphery of the outer ring wall 13, the gap between the vertical part 32 and the outer ring wall 13 constitutes a flame stabilization cavity 33 for the annular slit 15, and the lower part of the outer ring wall 13 is provided with a communication part 131 communicating the flame stabilization cavity 33 and the mixed gas cavity 14. After the mixed gas composed of the gas and the primary air in the mixed gas cavity 14 enters the flame stabilization cavity 33 through each communication part 131, the mixed gas first enters the vertical gap between the vertical part 32 and the outer ring wall 13 to buffer and slow down the mixed gas, and then flows out to burn, the flow rate is slow and located below the annular slit 15, so as to "pull" the outflow of the annular slit 15 and play a buffering and slowing down effect. In order to further buffer and slow down the mixed gas in the mixed gas cavity 14 when entering the flame stabilization cavity 33, the transverse part 31 has an inner step 311, the outer ring wall 13 is arranged on the first wall surface 3111 above the inner step 311, the second wall surface 3112 below the inner step 311 constitutes the bottom of the mixed gas cavity 14, and the communication part 131 is a downward opening notch. Among them, the mixed gas composed of the gas and the primary air in the mixed gas cavity 14 first flows along the first wall surface 3111 above the inner step 311 in the vertical direction, so as to lengthen the flow path of the mixed gas to reduce the flow rate, thereby constituting the first stage of flame stabilization, and then the second stage of flame stabilization is performed through the notch of the lower part of the outer ring wall 13. In addition, the top of the vertical part 32 of the lower ring body 3 is provided with at least two flame stabilization grooves arranged at intervals in the circumferential direction at the position adjacent to the annular slit 15. The setting of the flame stabilization grooves makes the mixed gas composed of the gas and the primary air further stabilize when flowing out of the flame stabilization cavity 33, thereby constituting the third stage of flame stabilization.The flame stabilizing groove comprises a flared section 30 gradually expanding along the direction of gas outflow. The flared section 30 can reduce the flow rate of the gas, so that the gas outflowing from the flame stabilizing groove is not easy to deviate from the flame when burning, so as to further stabilize the mixed gas composed of the gas and the primary air after the mixed gas passes through the flame stabilizing groove. In order to realize the further flame stabilizing effect of the flared section 30 of the flame stabilizing groove on the mixed gas, preferably, the outer ring wall 13 of the fire cover body 1 is radially inwardly retracted, the outer side end of the outer ring wall 13 is closer to the vertical part 32 than the outer ring wall 13, the flared section 30 has an inclined slope forming an angle α with the outer side end of the outer ring wall 13, and 30°≤α≤45°, and the angle α in the embodiment is 30°. Since the inclined slope can reduce the opening of the annular gap 15 for flame stabilization and the outer side end of the outer ring wall 13, the mixed gas makes a turn in the annular gap 15, the gas outflowing speed is reduced, the gas outflowing from the flame stabilizing groove is not easy to deviate from the flame when burning, the whole burner is stable when burning, and the fourth stage of flame stabilization is formed. Along the direction of gas outflow, the flame stabilizing part 310 for the flame stabilizing notch is arranged at the downstream of the first wall surface 3111 of the inner step 311. The flame stabilizing part 310 can further stabilize the flame after the second stage of flame stabilization. The flame stabilizing part 310 can make the mixed gas outflowing from the notch make a further turn and reduce the gas outflowing speed. The flame stabilizing part 310 is a boss arranged between the outer ring wall 13 and the first wall surface 3111 of the inner step 311 and protruding from the first wall surface 3111 of the inner step 311. The relationship between the height h1 of the boss and the height h2 of the notch is h1:h2=1:2. The limitation of the height of the boss can make the mixed gas outflow while making the mixed gas make a turn for further flame stabilization, so as to realize the fifth stage of flame stabilization.

[0026] In addition, the present application also solves how to improve the success rate of the ignition channel 4. Specifically, the annular top wall 11 of the fire cover body 1 is provided with the ignition channel 4 in the radial direction. The ignition channel 4 is provided with the gas inlet hole 41 communicating with the mixed gas chamber 14. The outer side opening 42 of the ignition channel 4 corresponds to the notch provided in the outer side end of the outer ring wall 13 and communicates with the flame stabilizing chamber 33. Since the flame stabilizing chamber 33 can stabilize the flame of the fire cover body 1, and since the outer side opening 42 of the ignition channel 4 communicates with the flame stabilizing chamber 33 through the notch of the outer ring wall 13, even if the gas outflowing speed of the gas inlet hole 41 of the ignition channel 4 is too fast, the ignition of the ignition channel 4 can be well stabilized, and the success rate of ignition is improved. In this way, the applicability of the ignition channel 4 to the damper opening is enhanced, that is, the ignition performance can be ensured under the condition that the damper opening is large.

Claims

1. A fire cover for a gas stove, comprising a fire cover body (1), wherein a gas mixing chamber (14) is 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 and outer edges of the annular top wall (11), and wherein: The outer annular wall (13) and the annular top wall (11) are connected via spacers (2) spaced apart in the circumferential direction, the spacers (2) being provided with communication holes (21) communicating with the gas mixing chamber (14), and an annular gap (15) communicating with the gas mixing chamber (14) is formed between the outer edges of the outer annular wall (13) and the annular top wall (11) via each spacer (2), and each spacer (2) is provided below the annular gap (15); A lower ring body (3) is further provided below the fire cover body (1), the lower ring body (3) comprising a transverse portion (31) for supporting the fire cover body (1) and a vertical portion (32) provided on the periphery of the outer ring wall (13), a gap between the vertical portion (32) and the outer ring wall (13) constituting a flame stabilizing cavity (33) for stabilizing the flame of the annular gap (15), and a connecting portion (131) for connecting the flame stabilizing cavity (33) and the gas mixing cavity (14) is provided at the lower portion of the outer ring wall (13); The transverse portion (31) has an inner step (311), the outer annular wall (13) rests on a first wall surface (3111) above the inner step (311), the second wall surface (3112) below the inner step (311) forms the bottom of the gas mixing chamber (14), and the connecting portion (131) is a recess with an opening facing downward.

2. The fire cover for a gas stove according to claim 1, characterized in that: At least two flame stabilizing grooves spaced apart along the circumferential direction are provided at the top of the vertical portion (32) of the lower ring body (3) at a position adjacent to the annular gap (15).

3. The fire cover for a gas stove according to claim 2, characterized in that: The flame stabilizing groove comprises a flaring section (30) which gradually expands along the direction in which the gas flows out.

4. The fire cover for a gas stove according to claim 3, characterized in that: The outer ring wall (13) of the fire cover body (1) is radially contracted inward, and the outer end of the outer ring wall (13) is closer to the vertical portion (32) than the outer ring wall (13). The flared section (30) has an inclined slope with an angle α formed with the outer end of the outer ring wall (13), and 30°≤α≤45°.

5. The fire cover for a gas stove according to any one of claims 1 to 4, characterized in that: The annular top wall (11) of the fire cover body (1) is provided with an ignition channel (4) along the radial direction, and the ignition channel (4) is provided with an air inlet hole (41) connected to the mixing chamber (14), and the outer opening (42) of the ignition channel (4) is a corresponding recess provided on the outer end of the outer annular wall (13), and the recess is connected to the flame stabilizing chamber (33).

6. The fire cover for a gas stove according to claim 5, characterized in that: Along the direction of outflow of the gas, the transverse portion (31) is provided with a flame stabilizing portion (310) for stabilizing the flame of the recess at a location downstream of the first wall surface (3111) of the inner step (311).

7. The fire cover for a gas stove according to claim 6, characterized in that: The flame stabilizing portion (310) is a boss arranged between the outer ring wall (13) and the first wall surface (3111) of the inner step (311), and higher than the first wall surface (3111) of the inner step (311). The relationship between the height h1 of the boss and the height h2 of the recess is: h1:h2=1:3~1:

2.

8. The fire cover for a gas stove according to claim 7, characterized in that: The width of the annular slit (15) is 1.0-1.8 mm, and an angle β is formed between the annular slit (15) and the second wall surface (3112) below the inner step (311), and 10°≤β≤60°.

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