Inner fire cover and burner having the same

Abstract

The present invention discloses an inner fire cover and a burner thereof. The inner fire cover includes an inner ring air cavity and an annular air cavity located outside the inner ring air cavity. A plurality of ignition holes are provided on the outer cavity wall of the inner ring air cavity. The annular air cavity is connected to the inner ring air cavity through the ignition holes. An inner ring fire hole group is provided at a position corresponding to the inner ring air cavity on the top of the inner fire cover. The inner ring fire hole group is connected to the inner ring air cavity. An air hole group and a blocking portion are provided at a position corresponding to the annular air cavity on the top of the inner fire cover. The air hole group is connected to the annular air cavity. The blocking portion is located above and radially outside some or all of the ignition holes. The inner fire cover of the present invention has a simple structure, which not only ensures sufficient combustion and effectively improves thermal efficiency, but also effectively prevents overflow from falling onto the ignition sensing needle through the blocking portion, thereby improving the reliability of ignition and sensing.

Description

Technical Field

[0001] The present invention relates to the technical field of gas stoves, in particular to an inner fire cover and a burner having the same. Background Art

[0002] The three-ring fire of the three-ring fire burner on the market is often arranged on three fire covers or two fire covers. If it is arranged on three fire covers, the burner structure will be relatively complex and the size will be larger; if the three-ring fire is arranged on two fire covers, then one of the fire covers will need to be arranged with two ring fires. If the inner fire cover is arranged with two ring fires, the inner ring fire usually burns poorly because it has no separate secondary air supply channel.

[0003] Direct-injection burners offer high heat exchange efficiency and a superior cooking experience. However, excessive direct-injection burner loads can lead to incomplete combustion and high CO emissions due to the shorter distance between the flame and the pot bottom. This, combined with poor secondary air supply, limits the burner's thermal efficiency. Furthermore, the burner's orifice is more susceptible to clogging when liquid spills during cooking, and excess liquid entering the burner can cause combustion failures. Summary of the Invention

[0004] The present invention aims to solve, at least to a certain extent, one of the problems existing in the existing related technologies. To this end, the present invention proposes an inner fire cover, which has a simple structure and not only ensures sufficient combustion and effectively improves thermal efficiency, but also effectively prevents overflow from falling onto the ignition sensing needle through the blocking portion, thereby improving the reliability of ignition and sensing.

[0005] The present invention also provides a burner with an inner fire cover.

[0006] According to the inner fire cover provided above, it is achieved through the following technical solutions:

[0007] An inner fire cover, the inner fire cover has an inner ring air cavity and an annular air cavity located outside the inner ring air cavity, a plurality of ignition holes are provided on the outer cavity wall of the inner ring air cavity, the annular air cavity is connected with the inner ring air cavity through the ignition holes, an inner ring fire hole group is provided at a position corresponding to the inner ring air cavity on the top of the inner fire cover, the inner ring fire hole group is connected with the inner ring air cavity, an air hole group and a blocking portion are provided at a position corresponding to the annular air cavity on the top of the inner fire cover, the air hole group is connected with the annular air cavity, and the blocking portion is located above the radial outside of part or all of the ignition holes.

[0008] In some embodiments, a downwardly recessed annular overflow groove is provided on the top of the inner fire cover, the annular overflow groove is located directly above the annular air cavity, and the air hole group and the blocking portion are provided on the bottom surface of the annular overflow groove.

[0009] In some embodiments, an inner bevel is provided on the top upper surface of the inner fire cover, and the inner bevel is arranged from the top center point of the inner fire cover radially outward and inclined downward, and the inner ring fire hole group is arranged on the inner bevel.

[0010] In some embodiments, the air hole group includes a plurality of secondary air holes arranged at intervals along the circumferential direction of the inner fire cover; the inner ring fire hole group includes at least one circle of inner fire hole groups, and each circle of the inner fire hole group includes a plurality of inner ring straight fire holes arranged at intervals along the circumferential direction of the inner fire cover.

[0011] In some embodiments, the diameter of the secondary air hole is larger than the diameter of the inner ring straight fire hole.

[0012] In some embodiments, the inner fire cover further has a middle ring air cavity located outside the annular air cavity, and a middle ring fire hole group is provided on the radial outside of the outer wall or top of the inner fire cover, and the middle ring fire hole group is connected to the middle ring air cavity.

[0013] In some embodiments, an outer slope or outer plane located outside the air hole group is provided on the top upper surface of the inner fire cover, the outer slope is arranged inclined in the vertical direction, and the middle ring fire hole group is arranged on the outer slope or the outer plane.

[0014] In some embodiments, the outer slope is arranged from the outer edge of the inner fire cover to the radial inside and tilted upward, or the outer slope is arranged from the outer edge of the inner fire cover to the radial inside and tilted downward.

[0015] In some embodiments, the middle ring fire hole group includes at least one circle of middle fire hole groups arranged at intervals along the radial direction, and each circle of the middle fire hole group includes a plurality of middle ring straight fire holes arranged at intervals along the circumferential direction of the inner fire cover.

[0016] According to the burner provided above, it is achieved through the following technical solutions:

[0017] The burner includes an ignition sensing needle, which also includes the inner ignition cover as described above. The ignition sensing needle is installed in the annular air cavity and is located directly below the blocking portion. The outlet direction of at least part of the ignition holes is toward the ignition sensing needle.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. The inner fire cover of the present invention provides an annular air cavity outside the inner ring air cavity and provides multiple ignition holes in the outer cavity wall of the inner ring air cavity, which are connected to the annular air cavity. This allows the ignition holes to be hidden inside the inner fire cover, making the inner fire cover more concise. At the same time, the flames of the ignition holes are located within the annular air cavity, ensuring better windproof effect for the flames of the ignition holes, thereby improving the ignition success rate and flame sensing reliability.

[0020] 2. By arranging the air hole group and the inner ring fire hole group on the top of the inner fire cover respectively, and the air hole group being placed outside the inner ring fire hole group and connected to the annular air cavity, secondary air is added to the inner ring fire flame, so that the gas burns fully, CO emissions are reduced, heat exchange efficiency is high, and thermal efficiency is effectively improved;

[0021] 3. A blocking portion is provided at the top of the inner ignition cover corresponding to the annular air cavity. The blocking portion is located above and radially outward of some or all of the ignition holes. This prevents overflow from falling onto the ignition sensing needle directly below the blocking portion, thereby improving the reliability of ignition and sensing.

[0022] 4. By installing the ignition sensing needle in the annular air cavity and directly below the blocking portion, the air outlet direction of at least part of the ignition holes is designed to be toward the ignition sensing needle, so that the ignition sensing needle is hidden in the annular air cavity of the inner fire cover. This can prevent overflow from falling onto the ignition sensing needle, thereby increasing the service life of the ignition sensing needle. Secondly, the induction flame has better resistance to crosswinds, thereby improving the reliability of ignition and induction. Thirdly, the appearance of the burner is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view of the inner fire cover and the ignition sensor needle in Example 1 of the present invention Figure 1 ;

[0024] Figure 2 This is a schematic structural diagram of the inner ignition cover and the ignition sensing needle in Example 1 of the present invention;

[0025] Figure 3 This is a cross-sectional view of the inner fire cover and the ignition sensor needle in Example 1 of the present invention Figure 2 ;

[0026] Figure 4 It is a cross-sectional view of the inner ignition cover and the ignition sensor needle in embodiment 2 of the present invention.

[0027] In the figure: 1-inner fire cover, 11-inner ring air cavity, 110-inner ring straight fire hole, 111-ignition hole, 12-annular air cavity, 120-secondary air hole, 121-blocking part, 13-middle ring air cavity, 130-middle ring straight fire hole, 14-annular overflow groove, 150-top center point, 151-inner bevel, 152-outer bevel, 153-outer plane; 2-ignition sensor needle. DETAILED DESCRIPTION

[0028] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0029] Example 1

[0030] refer to Figure 1 This embodiment provides an inner fire cover. The inner fire cover 1 is an integral structure or an integrally molded structure. The inner fire cover 1 has an inner ring air cavity 11 that opens downward and an annular air cavity 12 that opens downward. The annular air cavity 12 is located outside the inner ring air cavity 11. A plurality of ignition holes 111 are provided on the outer cavity wall of the inner ring air cavity 11. The annular air cavity 12 is connected to the inner ring air cavity 11 through the ignition holes 111. In this way, all the ignition holes 111 are located outside the inner ring air cavity 11, and the flames of the ignition holes 111 are hidden inside the annular air cavity 12, so that the flames of the ignition holes are better protected from wind. In this embodiment, the annular air cavity 12 not only serves as a secondary air supply channel, but also serves as a flame protection space for the ignition holes 111 and an installation space for the ignition sensing needle 2. When the ignition sensing needle 2 is installed in the annular air cavity 12 and is located in the air outlet direction of the ignition hole 111, the flame sensing of the ignition sensing needle 2 is more stable and reliable.

[0031] An inner ring fire hole group is provided at the position of the inner ring air cavity 11 on the top of the inner fire cover. The inner ring fire hole group is connected to the inner ring air cavity 11, and the gas is ignited and burned at the inner ring fire hole group to form an inner ring fire. An air hole group and a blocking portion 121 are provided at the position of the annular air cavity 12 on the top of the inner fire cover. The air hole group is located on the periphery of the inner ring fire hole group and is connected to the annular air cavity 12. In this way, secondary air is added to the inner ring fire flame through the connected annular air cavity 12 and the air hole group, so that the gas burns fully, CO emissions are reduced, heat exchange efficiency is high, and thermal efficiency is effectively improved. The blocking portion 121 is located above and radially outside some or all of the ignition holes 111. In this way, the blocking portion 121 can prevent the overflow dripping onto the upper surface of the inner fire cover 1 from falling onto the ignition sensing needle 2, thereby improving the reliability of ignition and induction.

[0032] In this embodiment, a downwardly recessed annular overflow groove 14 is provided on the top of the inner fire cover. The annular overflow groove 14 is located directly above the annular air cavity 12. An air hole group and a blocking portion 121 are provided on the bottom surface of the annular overflow groove 14. Therefore, when the gas stove overflows during cooking, the overflow first collects in the annular overflow groove 14 and then flows downward from the air hole group into the annular air cavity 12, thereby preventing a large amount of liquid from flowing into the burner and causing burner malfunction. Therefore, the annular air cavity 12 serves as both a secondary air supply channel during normal combustion and a drainage channel in the event of overflow.

[0033] An inner bevel 151 is provided radially inwardly on the top surface of the inner fire cover. The inner bevel 151 is arranged radially outwardly and downwardly from the center point 150 of the top of the inner fire cover. An outer bevel 152 is provided on the top surface of the inner fire cover, located around the air hole group. In this embodiment, the outer bevel 152 is arranged radially inwardly and downwardly from the outer edge of the inner fire cover. In other embodiments, the outer bevel 152 may also be designed to be arranged radially inwardly and upwardly from the outer edge of the inner fire cover.

[0034] The annular overflow groove 14 is provided at the junction of the inner inclined surface 151 and the outer inclined surface 152, and the radial outer side of the inner inclined surface 151 and the radial inner side of the outer inclined surface 152 respectively constitute the two opposite groove walls of the annular overflow groove 14, see Figure 1 and Figure 3 Thus, through the cooperation of the inner bevel 151 and the outer bevel 152, when the gas stove overflows during cooking, the inner bevel 151 and the outer bevel 152 facilitate the drainage of the overflow into the annular overflow groove 14, so that the overflow is discharged from the air hole group.

[0035] In this embodiment, reference Figure 3 , the top center point 150 is flush with the radial outer edge of the outer slope 152. Figure 1 The inner ring fire hole group is located on the lower half of the inner bevel 151. The inner ring fire hole group includes at least one circle of inner fire hole groups. Each circle of inner fire hole groups includes multiple inner ring straight fire holes 110 spaced apart along the circumference of the inner fire cover. When the gas ignites and burns at the inner ring straight fire holes 110, an inner ring straight jet fire is formed. Thus, by concentrating the firepower of the inner ring fire or inner ring straight jet fire on the lower half of the inner bevel 151, a portion of the firepower can be diverted to the top center point 150 through the upper half of the inner bevel 151, effectively preventing excessive firepower at the bottom center of the cookware, which can easily cause the pot to burn.

[0036] In this embodiment, the inner ring fire hole group includes three circles of inner fire hole groups, which are arranged radially outside the inner bevel 151 at intervals along the radial direction. Each circle of inner fire hole group includes a plurality of inner ring straight fire holes 110 arranged at intervals along the circumferential direction of the inner fire cover. In this way, the firepower area of the inner ring fire is increased, and the inner ring straight fire can also heat the center of the pot evenly, providing a good cooking experience.

[0037] refer to Figure 1 The air hole group includes a plurality of secondary air holes 120 arranged at intervals along the circumferential direction of the inner fire cover. All the secondary air holes 120 are arranged at intervals along the circumferential direction on the bottom surface of the annular overflow groove 14. The diameter of each secondary air hole 120 is larger than the diameter of the inner ring straight fire hole 110 to ensure that the inner fire cover 1 has a larger secondary air ventilation area, thereby realizing the secondary air required for the supplementary combustion of the inner ring fire or the inner ring direct spray fire, and ensuring that the inner ring fire burns more fully.

[0038] In this embodiment, each secondary air hole 120 not only penetrates the bottom surface of the annular overflow groove 14, but also penetrates part of the lower side of the inner groove wall and part of the lower side of the outer groove wall of the annular overflow groove 14, that is, each secondary air hole 120 penetrates the radially outer part of the inner inclined surface 151 and the radially inner part of the outer inclined surface 152, so as to ensure that the overflow liquid can be discharged directly from the opposite ends of the radial direction of the secondary air hole 120 before flowing along the inner inclined surface 151 and the outer inclined surface 152 to the lowest point of the annular overflow groove 14.

[0039] refer to Figure 1-2 In this embodiment, five ignition hole groups are circumferentially spaced apart on the outer wall of the inner annular air cavity 11. Each ignition hole group includes two ignition holes 111 spaced apart from each other, thereby increasing the ignition area and further improving flame transmission reliability. The five ignition hole groups are arranged in a clockwise order, and all secondary air holes 120 are arranged in a clockwise order, with the primary and secondary air holes 120 closest to the blocking portion 121 in the clockwise direction being the first, and the primary and secondary air holes 120 closest to the blocking portion 121 in the counterclockwise direction being the last. The exhaust direction of the middle (i.e., third) ignition hole group is designed to be located directly below the blocking portion 121. This prevents overflow from falling directly into the exhaust direction of the third ignition hole group, effectively improving the flame windproof effect of the third ignition hole group and ensuring more stable flame sensing at this location. When the ignition sensor needle 2 is installed in the annular air cavity 12 and located in the exhaust direction of the third ignition hole group, ignition and flame sensing by the ignition sensor needle 2 are more reliable.

[0040] The gas outlet directions of the first and second ignition hole groups are both designed to be directly below the last secondary air hole 120. Of course, the gas outlet directions of the first and second ignition hole groups can also be designed to be directly below the last two secondary air holes 120. Similarly, the gas outlet directions of the fourth and fifth ignition hole groups are both designed to be directly below the first secondary air hole 120. Of course, the gas outlet directions of the fourth and fifth ignition hole groups can also be designed to be directly below the first and second secondary air holes 120, respectively. Thus, by designing the gas outlet directions of some ignition hole groups to be directly below some secondary air holes 120, when the gas ignites and burns at the ignition holes 111 of these ignition hole groups, this part of the flame can directly transmit upward through the secondary air holes 120 located above it, thereby achieving rapid ignition of the gas ejected upward from the inner ring fire hole group. It can be seen that the two or four secondary air holes 120 arranged near the blocking portion 121 are not only secondary air supplement channels during normal combustion, but also fire transfer channels when the burner is ignited and burning, which is beneficial to increase the fire transfer area and further improve the fire transfer reliability.

[0041] refer to Figure 1-3 The inner fire cover also has a middle ring air cavity 13 located outside the annular air cavity 12. A middle ring fire hole group is provided on the radially outer side of the outer wall or top of the inner fire cover, and the middle ring fire hole group is connected to the middle ring air cavity 13. As a result, the inner fire cover 1 has two ring fires, namely the inner ring fire and the middle ring fire. Since the annular air cavity 12 is located between the middle ring air cavity 13 and the inner ring air cavity 11, a separate secondary air supply channel is effectively guaranteed between the inner ring fire and the middle ring fire, which better replenishes secondary air for the radially outer side of the inner ring fire and the radially inner side of the middle ring fire, so that the gas burns fully on the inner fire cover 1. In addition, the inner fire cover is equipped with more heat loads, which reduces CO emissions and improves heat exchange efficiency.

[0042] In this embodiment, the middle ring fire hole group is arranged on the outer bevel 152. The middle ring fire hole group includes at least one circle of middle fire hole groups arranged at intervals along the radial direction, and each circle of middle fire hole groups includes a plurality of middle ring straight fire holes 130 arranged at intervals along the circumferential direction of the inner fire cover, and the diameter of each middle ring straight fire hole 130 is smaller than the diameter of the secondary air holes 120 in the air hole group. Therefore, when the fuel gas is ignited and burned at the middle ring straight fire hole 130, a middle ring straight flame is formed; because the outer bevel 152 is arranged from the outer edge of the inner fire cover to the radial inside and tilted downward, the outer bevel 152 can serve as a heat gathering surface, which is conducive to gathering the combustion heat on the inner fire cover 1 on the upper surface of the inner fire cover 1, reducing the heat loss to the radial outside of the inner fire cover 1, and improving the combustion thermal efficiency.

[0043] In this embodiment, the middle fire hole group includes three circles of middle fire hole groups, which are arranged on the outer inclined surface 152 at intervals along the radial direction. Each circle of middle fire hole group includes a plurality of middle ring straight fire holes 130 arranged at intervals along the circumferential direction of the middle fire cover. In this way, the firepower area range of the middle ring fire is increased and the thermal efficiency is improved.

[0044] refer to Figure 1-2 This embodiment also provides a burner, which includes an ignition sensing needle 2 and the inner fire cover as described above. The ignition sensing needle 2 is installed in the annular air cavity 12 and is located directly below the blocking portion 121. The outlet direction of at least some of the ignition holes 111 is toward the ignition sensing needle 2. Therefore, by installing the ignition sensing needle 2 in the annular air cavity 12 and being located directly below the blocking portion 121, all the ignition holes are located outside the inner annular air cavity 11, and the outlet direction of at least some of the ignition holes 111 is designed to be toward the ignition sensing needle 2, the ignition sensing needle 2 is hidden in the annular air cavity of the inner fire cover 1. Firstly, it can prevent overflow from falling onto the ignition sensing needle 2, which is beneficial to increasing the service life of the ignition sensing needle 2. Secondly, it can make the induced flame more resistant to crosswinds, improve the reliability of ignition and induction, and thirdly, make the burner more concise in appearance.

[0045] Example 2

[0046] refer to Figure 4 The difference between this embodiment and embodiment 1 is that the outer inclined surface 152 is replaced by an outer plane 153 flush with the horizontal plane, the middle ring fire hole group is arranged on the outer plane 153, and the annular overflow groove 14 is arranged at the intersection of the inner inclined surface 151 and the outer plane 153 to prevent all overflow from gathering in the overflow groove 14.

[0047] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. Inner fire cover, characterized in that, The inner fire cover has an inner ring air cavity (11) and an annular air cavity (12) located outside the inner ring air cavity (11); a plurality of ignition holes (111) are provided on the outer cavity wall of the inner ring air cavity (11); the annular air cavity (12) is connected to the inner ring air cavity (11) through the ignition holes (111); an inner ring fire hole group is provided at a position corresponding to the inner ring air cavity (11) on the top of the inner fire cover; the inner ring fire hole group is connected to the inner ring air cavity (11); an air hole group and a blocking portion (121) are provided at a position corresponding to the annular air cavity (12) on the top of the inner fire cover; the air hole group is connected to the annular air cavity (12); the blocking portion (121) is located on the radial outer side of part or all of the ignition holes (111) A downwardly concave annular overflow groove (14) is provided on the top of the inner fire cover, and the annular overflow groove (14) is located directly above the annular air cavity (12). The air hole group and the blocking portion (121) are provided on the bottom surface of the annular overflow groove (14). An inner bevel (151) is provided on the top upper surface of the inner fire cover, and the inner bevel (151) is arranged from the top center point (150) of the inner fire cover to the radial outside and tilted downward. The inner ring fire hole group is provided on the inner bevel (151). The inner fire cover also has a middle ring air cavity (13) located outside the annular air cavity (12). A middle ring fire hole group is provided on the outer wall or radial outside of the top of the inner fire cover, and the middle ring fire hole group is connected to the middle ring air cavity (13).

2. The inner fire cover according to claim 1, characterized in that: The air hole group includes a plurality of secondary air holes (120) arranged at intervals along the circumferential direction of the inner fire cover; The inner ring fire hole group comprises at least one circle of inner fire hole groups, and each circle of the inner fire hole group comprises a plurality of inner ring straight fire holes (110) arranged at intervals along the circumferential direction of the inner fire cover.

3. The inner fire cover according to claim 2, characterized in that: The diameter of the secondary air hole (120) is greater than the diameter of the inner ring straight fire hole (110).

4. The inner fire cover according to claim 1, characterized in that: An outer inclined surface (152) or an outer plane (153) located on the periphery of the air hole group is provided on the top upper surface of the inner fire cover. The outer inclined surface (152) is arranged obliquely in the vertical direction, and the middle ring fire hole group is arranged on the outer inclined surface (152) or the outer plane (153).

5. The inner fire cover according to claim 4, characterized in that: The outer inclined surface (152) is arranged from the outer edge of the inner fire cover to the radial inner side and tilted upward, or the outer inclined surface (152) is arranged from the outer edge of the inner fire cover to the radial inner side and tilted downward.

6. The inner fire cover according to claim 1, characterized in that: The middle ring fire hole group comprises at least one circle of middle fire hole groups spaced apart in the radial direction, and each circle of the middle fire hole group comprises a plurality of middle ring straight fire holes (130) spaced apart in the circumferential direction of the inner fire cover.

7. A burner comprising an ignition sensing needle (2), characterized in that It also includes an inner ignition cover as described in any one of claims 1 to 6, wherein the ignition sensing needle (2) is installed in the annular air cavity (12) and is located directly below the blocking portion (121), and the outlet direction of at least part of the ignition hole (111) is toward the ignition sensing needle (2).

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