Outer fire cover, fire cover assembly and combustor thereof

Abstract

The utility model discloses an outer fire cover, a fire cover assembly and a combustor, the outer fire cover is provided with a central cavity with openings at the upper end and the lower end, an air cavity with a downward opening and an outer ring cavity with a downward opening, and the air cavity is arranged between the outer ring cavity and the central cavity; the top of the outer fire cover is provided with an air hole set and an outer fire hole set, the air hole set is communicated with the air cavity, and the outer fire hole set is communicated with the outer ring cavity. The outer fire cover not only can meet the requirement of outer ring fire, but also has the function of transmitting inner ring gas and secondary air.

Description

Technical Field

[0001] The utility model relates to the technical field of gas stoves, in particular to an outer fire cover, a fire cover assembly and a burner thereof. Background Art

[0002] To meet the requirements of high-power combustion, flame uniformity, and power regulation, existing stove burners utilize a separate, concentric dual-ring structure with an outer and inner ring flame cover. The common method for replenishing secondary air is to leave a channel between the outer and inner ring flame covers. Secondary air enters the channel through the bottom of the outer ring flame cover. However, because the channel is exposed, overflowing liquid will flow directly downward and accumulate in the channel, making it difficult to clean.

[0003] Existing external flame covers have a limited function and can only meet the requirements of an external ring fire. In addition, the flame cover of existing burners is usually too high, with a height of more than 40mm from the glass panel and a pot support height of more than 62mm. The overall effect is rather abrupt, affecting the aesthetics of the gas stove and the overall style of the home. Summary of the Invention

[0004] The present invention aims to at least partially address one of the problems existing in the prior art. To this end, the present invention provides an outer flame cover that not only meets the requirements of an outer ring flame but also functions to transmit inner ring gas and secondary air. The present invention also provides a flame cover assembly and a burner.

[0005] According to the fire cover assembly provided above, it is implemented through the following technical solutions:

[0006] A fire cover assembly, the outer fire cover having a central cavity with openings at both upper and lower ends, an air cavity opening downward, and an outer ring cavity opening downward, the air cavity being arranged between the outer ring cavity and the central cavity; an air hole group and an outer fire hole group are provided on the top of the outer fire cover, the air hole group is connected to the air cavity, and the outer fire hole group is connected to the outer ring cavity.

[0007] In some embodiments, an annular guide groove opening upward and located between the air hole group and the outer fire hole group is recessed on the top of the outer fire cover; and / or a plurality of strip guide grooves opening upward are recessed on the radially outer side of the top of the outer fire cover, all of the strip guide grooves are arranged at intervals in the circumferential direction, each of the strip guide grooves is arranged in the radial direction, and an outer fire hole group is provided between adjacent strip guide grooves.

[0008] In some embodiments, the radial inner end of the strip-shaped guide groove is communicated with the annular guide groove, and / or the strip-shaped guide groove is arranged to be radially outward and inclined downward from the annular guide groove.

[0009] In some embodiments, a water retaining rib extending upward and located between adjacent strip-shaped guide grooves is integrally formed on the top of the outer fire cover, and the water retaining rib is arranged radially outward of the annular guide groove.

[0010] In some embodiments, a second through hole communicating with the air cavity is provided at the top of the outer fire cover; and / or an upper annular retaining ring extending upward is integrally formed on the radial inner side of the top of the outer fire cover, and the upper annular retaining ring constitutes the upper end of the central cavity.

[0011] In some embodiments, the radial outer side of the top of the outer fire cover is an outer guide surface, and the radial inner side of the top of the outer fire cover is an inner guide surface or an inner plane. The inner guide surface and the outer guide surface are both arranged from the inside to the radial outside and inclined or curved downward; the outer fire hole group is arranged on the outer guide surface, and the air hole group and the second through hole are both arranged on the inner guide surface or the inner plane.

[0012] In some embodiments, a plurality of first connecting portions arranged circumferentially at intervals are provided in the air cavity, and first fixing holes are provided on the first connecting portions, respectively passing through the first connecting portions and the top of the outer fire cover; and / or a plurality of second connecting portions arranged circumferentially at intervals are provided in the outer ring cavity, and the second connecting portions are provided with second fixing holes opening downward.

[0013] According to the fire cover assembly provided above, it is implemented through the following technical solutions:

[0014] A fire cover assembly, the fire cover assembly includes an outer fire cover as described above, the fire cover assembly also includes: an inner fire cover, which is covered on the top of the outer fire cover, the inner fire cover is provided with an inner ring cavity and an inner fire hole group opening downward, the inner fire hole group is connected with the central cavity through the inner ring cavity; and / or a fire divider, which is arranged at the bottom of the outer fire cover, the fire divider is provided with an inner ring air duct, a middle ring air duct and an outer ring air duct, the inner ring air duct is connected with the lower end of the central cavity, the middle ring air duct is connected with the lower end of the air cavity, and the outer ring air duct is connected with the lower end of the outer ring cavity.

[0015] In some embodiments, a brim extending outward is provided at the periphery of the lower end of the inner fire cover, and the brim covers the air hole group in positive projection. A secondary air outlet is formed between the brim and the top of the outer fire cover, and the secondary air outlet is connected to the air cavity through the air hole group.

[0016] In some embodiments, the radial outer end portion of the brim is arranged opposite to the annular guide groove of the outer fire cover, and a first through hole is provided at the brim.

[0017] In some embodiments, the inner fire cover is in the shape of a truncated cone with a larger lower end and a smaller upper end. An inner fire hole group and an upwardly extending ignition boss are provided on the upper surface of the outer side wall of the inner fire cover, and a liquid storage tank is recessed at the center position of the top of the inner fire cover.

[0018] In some embodiments, the fire distributor is further provided with an annular guide portion, which is arranged at the periphery of the outer ring air duct and the outer fire cover, and is used to guide the overflow flowing from the outer fire cover into the liquid receiving tray.

[0019] According to the burner provided above, it is realized by the following technical solution:

[0020] A burner, comprising: a burner head, provided with an inner mixing chamber opening upward, an air chamber opening upward and an outer mixing chamber opening upward, a secondary air inlet being provided at the bottom of the air chamber or the lower end of the outer cavity wall; and an outer fire cover as described above or a fire cover assembly as described in any one of claims 1 to 4, wherein the outer fire cover is arranged on the top of the burner head, the lower end of the central cavity is connected to the inner mixing chamber, the air cavity is connected to the secondary air inlet through the air chamber, and the outer ring cavity is connected to the outer mixing chamber.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] 1. The outer fire cover of the utility model is provided with a central cavity, an air cavity and an outer ring cavity spaced apart in the radial direction on the outer fire cover, and an air hole group connected to the air cavity and an outer fire hole group connected to the outer ring cavity are respectively provided at the radial inner and outer ends of the top of the outer fire cover. The structure is simple. Compared with the existing outer fire cover, it can not only meet the requirements of outer ring fire, but also has the function of transmitting inner ring gas and secondary air. At the same time, it helps to reduce the height of the outer fire cover and meet the ultra-thin requirement.

[0023] 2. By providing an upward-opening annular drainage groove on the top of the outer fire cover and located between the air hole group and the outer fire hole group, the outer fire cover can receive the overflow from the inner fire cover and prevent this overflow from flowing into the burner through the air hole group and / or the outer fire hole group, thereby solving the problem of the secondary air channel reserved between the outer ring fire cover and the inner ring fire cover of the existing burner affecting the cleanliness of the burner interior;

[0024] 3. By providing a plurality of upward-opening strip guide grooves on the radially outer side of the top of the outer fire cover, it is convenient to drain the overflow on the outer fire cover to the outside of the outer fire cover. At the same time, it can prevent the legs of the pot bracket located directly above the strip guide grooves from being burned by the flame, which is beneficial to reducing the temperature rise of the pot bracket and the panel of the gas stove. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is an exploded view of the fire cover assembly in Example 1 / 2 of the present invention;

[0026] Figure 2 This is a schematic structural diagram of the fire cover assembly in Embodiment 1 / 2 of the present invention;

[0027] Figure 3 This is a cross-sectional view of the fire cover assembly in Example 1 / 2 of the present utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the inner fire cover in embodiment 1 / 2 of the present invention. Figure 1 ;

[0029] Figure 5 This is a schematic diagram of the structure of the inner fire cover in embodiment 1 / 2 of the present invention. Figure 2 ;

[0030] Figure 6 This is a cross-sectional view of the inner fire cover in Example 1 / 2 of the present utility model;

[0031] Figure 7 This is a schematic structural diagram of the outer fire cover in Embodiment 1 / 2 of the present invention;

[0032] Figure 8 This is a bottom view of the outer fire cover in embodiment 1 / 2 of the present invention;

[0033] Figure 9 This is a schematic structural diagram of the fire distributor in Example 1 / 2 of the present utility model;

[0034] Figure 10 This is a bottom view of the fire distributor in Example 1 / 2 of the present utility model;

[0035] Figure 11 This is an exploded view of the fire cover assembly in Example 3 of the present utility model;

[0036] Figure 12 This is a schematic structural diagram of the fire cover assembly in Example 3 of the present utility model;

[0037] Figure 13 is a cross-sectional view of the fire cover assembly in Example 3 of the present utility model;

[0038] Figure 14 This is an exploded view of the burner in Example 4 of the present utility model;

[0039] Figure 15 This is a schematic structural diagram of the burner in Example 4 of the present utility model;

[0040] Figure 16 is a cross-sectional view of a burner in Example 4 of the present utility model;

[0041] Figure 17This is a right side view of the gas stove in Example 4 of the present utility model;

[0042] Figure 18 This is a schematic structural diagram of a gas stove in Example 4 of the present utility model;

[0043] Figure 19 It is a cross-sectional view of the burner in Example 5 of the present utility model.

[0044] In the figure: 1-inner fire cover, 10-inner ring cavity, 11-enclosing plate, 111-inner ring fire hole, 112-inner ring retaining ring, 113-fixing column, 114-positioning portion, 12-top plate, 121-liquid storage tank, 13-ignition boss, 131-transverse section, 132-vertical section, 1321-ignition hole, 1322-air bleed channel, 1323-guide surface, 14-cap brim, 141-first through hole, 142-outer inclined surface;

[0045] 2-outer fire cover, 20-secondary air outlet, 21-center cavity, 22-air cavity, 220-second through hole, 221-secondary air hole, 222-annular guide groove, 223-water retaining rib, 224-upper annular retaining ring, 23-outer ring cavity, 231-outer ring fire hole, 232-strip guide groove, 25-first connecting portion, 251-first fixing hole, 26-second connecting portion, 261-second fixing hole;

[0046] 3-ignition distributor, 31-inner ring air channel, 310-inner ring groove, 311-center through hole, 312-inner ring diverter hole, 32-middle ring air channel, 321-middle ring groove, 322-middle ring air hole, 323-third through hole, 33-outer ring air channel, 331-outer ring groove, 332-outer ring diverter hole, 333-annular support platform, 334-mounting column, 34-annular guide part, 351-inner ring dividing rib, 352-outer ring dividing rib;

[0047] 4-burner head, 41-burner head body, 411-inner mixing chamber, 4111-inner ring premixing head, 412-air chamber, 4121-secondary air inlet, 413-outer mixing chamber, 4131-outer ring premixing head, 42-ejection assembly;

[0048] 5-liquid tray; 6-ignition assembly; 7-shell assembly; 8-pot support. DETAILED DESCRIPTION

[0049] The following examples illustrate the present invention, but the present invention is not limited by 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.

[0050] Example 1 / 2

[0051] refer to Figure 1-3 and Figure 7-8 This embodiment provides a fire cover assembly, in which the outer fire cover 2 is an integrally formed structure. The outer fire cover 2 has a central cavity 21 with openings at both ends, an air cavity 22 opening downward, and an outer ring cavity 23 opening downward, wherein the air cavity 22 is arranged between the outer ring cavity 23 and the central cavity 21. The central cavity 2 is used for allowing a mixture of inner ring gas and air to pass through, the air cavity 22 is used for allowing secondary air to pass through, and the outer ring cavity 23 is used for allowing a mixture of outer ring gas and air to pass through.

[0052] An air hole group for secondary air to pass through and an outer fire hole group for outer ring gas to pass through are provided on the top of the outer fire cover 2. The air hole group includes a plurality of secondary air holes 221 arranged at intervals in the circumferential direction. The air hole group is connected to the air cavity 22 to form a secondary air channel. The outer fire hole group includes a plurality of outer ring fire holes 231 arranged at intervals. The outer fire hole group is connected to the outer ring cavity 23.

[0053] It can be seen that compared with the existing outer fire cover, the outer fire cover 2 of this embodiment can not only meet the outer ring fire requirements, but also has the function of transmitting inner ring gas and secondary air; in addition, since the outer ring fire holes and secondary air holes 221 are directly designed on the upper surface of the outer fire cover 2, it is beneficial to reduce the height of the outer fire cover 2 and meet the ultra-thin requirements.

[0054] refer to Figure 7-8 Furthermore, an annular guide groove 222 opening upward and located between the air hole group and the outer fire hole group is provided on the top of the outer fire cover 2. The annular guide groove 222 is configured to be arranged opposite to the radial outer edge of the inner fire cover 1 (see Figure 3 ), is used to receive the overflow liquid (i.e., overflow) flowing down from the inner fire cover 1, to prevent this part of the overflow from flowing into the outer ring fire hole 231 or the secondary air hole, so as to solve the problem that the secondary air channel reserved between the outer ring fire cover and the inner ring fire cover of the existing burner affects the internal cleaning of the burner. In addition, a plurality of strip guide grooves 232 opening upward are recessed on the radial outer side of the top of the outer fire cover 2, all of the strip guide grooves 232 are arranged at intervals along the circumferential direction, and each strip guide groove 232 is arranged along the radial direction, so that the overflow on the outer fire cover 2 can flow out of the outer fire cover 2 along the strip guide grooves 232, so that the outer fire cover 2 has the overflow drainage function, and thus has good easy-to-clean performance.

[0055] In this embodiment, the radial inner ends of the strip guide grooves 232 are respectively connected to the annular guide grooves 222 to form drainage channels, so that the overflow in the annular guide grooves can flow out of the outer fire cover 2 along the strip guide grooves 232. The strip guide grooves 232 are arranged to be radially outward and inclined downward from the annular guide grooves 222 to facilitate the rapid discharge of the overflow outside the outer fire cover 2.

[0056] In this embodiment, the number of the strip guide grooves 232 is the same as the number of the legs of the pot support, and the strip guide grooves 232 are arranged opposite to the legs of the pot support (see Figure 18 ), the strip-shaped guide grooves 232 can catch liquid overflowing from the legs of the pot support, preventing the legs from being burned by the flames, thereby reducing the temperature rise of the pot support and the gas stove panel. Specifically, an outer fire hole group is provided between adjacent strip-shaped guide grooves 232. That is, the area on the top of the outer fire cover 2 between adjacent strip-shaped guide grooves 232 is evenly distributed with outer ring fire holes 231. This achieves the purpose of zoning the outer ring fire power, making the outer ring fire power more evenly distributed and covering a wider range.

[0057] refer to Figure 7-8 Furthermore, a water retaining rib 223 extending upward and located between adjacent strip-shaped guide grooves 232 is integrally formed on the top of the outer fire cover 2. The water retaining rib 223 is arranged radially outward from the annular guide groove 222. The height of the water retaining rib 223 is 1.5 mm, 2 mm, or 2.5 mm. In this embodiment, the water retaining rib 223 forms the upper end of the outer groove wall of the annular guide groove 222. In other embodiments, the water retaining rib 223 can also be spaced apart from the outer groove wall of the annular guide groove 222. As a result, when overflowing liquid flows downward from the inner fire cover 1 into the annular guide groove 222 of the outer fire cover 2, it will not flow into the outer ring fire hole due to the blocking effect of the water retaining rib 223.

[0058] refer to Figure 7-8 Furthermore, a second through-hole 220 is provided at the top of the outer fire cover 2, communicating with the air cavity 22. This second through-hole 220 is used for the ignition needle to pass through. An upwardly extending upper annular retaining ring 224 is integrally formed on the radially inner side of the top of the outer fire cover 2. This upper annular retaining ring 224 forms the upper end of the central cavity 21, so that the outer fire cover 2 can be sealed with the inner fire cover through the upper annular retaining ring 224.

[0059] In this embodiment, the radially outer side of the top of the outer fire cover 2 is the outer guide surface, and the radially inner side of the top of the outer fire cover 2 is the inner guide surface or inner plane. Both the inner guide surface and the outer guide surface are arranged from the inside to the radially outer side and are tilted or curved downward, so that the outer fire cover 2 is conical or truncated with a larger lower end and a smaller upper end, which is conducive to reducing the thickness of the outer fire cover. The outer fire hole group and the strip guide groove are both arranged on the outer guide surface, so that the outer fire hole group and the strip guide groove are both tilted in the radial direction, which is convenient for draining overflow liquid and gas while forming outer ring fires of different heights, making the outer ring fire power distribution more uniform; the air hole group and the second through hole 220 are both arranged on the inner guide surface or inner plane; the annular guide groove can be set at the radial outer end of the inner guide surface or inner plane, or at the radial inner end of the outer guide surface.

[0060] refer to Figure 8A plurality of first connecting portions 25 are arranged in a circumferentially spaced manner and close to the central cavity 21 in the air cavity 22. The first connecting portions 25 are integrally formed with the cavity top surface and the inner wall surface of the air cavity 22. First fixing holes 25 are respectively provided on the first connecting portions 25 and pass through the first connecting portions 25 and the top of the outer fire cover 2. In this way, the outer fire cover 2 can be detachably connected to the inner fire cover through the first connecting portions 25 (see Figure 3 or Figure 13 A plurality of second connecting parts 26 are provided in the outer ring cavity 23, which are arranged at intervals in the circumferential direction and away from the air cavity 22. The second connecting parts 26 are integrally formed with the cavity top surface and the outer wall surface of the cavity of the outer ring cavity 23, respectively. The second connecting parts 26 are provided with second fixing holes 261 opening downward, so that the outer fire cover 2 can be detachably connected to the ignition distributor through the second connecting parts 26 (see Figure 3 ).

[0061] Example 2

[0062] refer to Figure 1-3 This embodiment provides a fire cover assembly, comprising an outer fire cover as described in Example 1, and further comprising an inner fire cover 1 and / or a fire divider 3, wherein the inner fire cover 1 is arranged on top of the outer fire cover 2 and is detachably connected to the outer fire cover 2 as a whole, at which time the inner fire cover is superimposed on the top of the outer fire cover, and the inner fire cover 1 is provided with an inner ring cavity 10 opening downward and an inner fire hole group, and the inner fire hole group is connected to the central cavity 21 through the inner ring cavity 10. The fire divider 3 is arranged at the bottom of the outer fire cover and is detachably connected to the outer fire cover 2, and the fire divider 3 is provided with an inner ring air duct 31, a middle ring air duct 32 and an outer ring air duct 33, the middle ring air duct 32 is located between the inner ring air duct 31 and the outer ring air duct 33, the inner ring air duct 31 is connected to the lower end of the central cavity 21, the middle ring air duct 32 is connected to the lower end of the air cavity 22, and the outer ring air duct 33 is connected to the lower end of the outer ring cavity 23.

[0063] refer to Figure 1-6In this embodiment, the inner fire cover 1 is an integrally formed structure, and its diameter gradually decreases from bottom to top. The inner fire cover 1 includes a surrounding plate 11, a top plate 12, and an ignition boss 13. The surrounding plate 11 is in the shape of a truncated cone with a larger lower end and a smaller upper end, and constitutes the side wall of the inner fire cover. An inner fire hole group is provided on the surrounding plate 11, and the inner fire hole group consists of a plurality of inner ring fire holes 111 arranged at intervals in the circumferential direction. The top plate 12 constitutes the top of the inner fire cover. The top plate 12 is fixedly connected to the upper end or top of the surrounding plate 11 and the two are integrally formed. The top plate 12 and the surrounding plate 11 together enclose an inner ring cavity 10 that opens downward, and the inner ring cavity 10 is connected to the plurality of inner ring fire holes 111. The ignition boss 13 is fixedly connected to the outer wall of the enclosure 11 and the two are integrally formed. It includes a transverse section 131 and a vertical section 132 fixedly connected to each other in a "7" shape. The transverse section 131 is fixedly connected to the outer wall of the enclosure 11 through the vertical section 132. On the side of the vertical section 132 facing away from the top plate 12, there is a plurality of ignition holes 1321 located directly below the transverse section 131 and connected to the inner ring cavity 10.

[0064] It can be seen that by designing the enclosure 11 of the inner fire cover 1 into a truncated cone shape, and fixing the top plate 12 to the upper end or top of the enclosure 11, and fixing the ignition boss 13 to the outer wall of the enclosure 11, the height of the inner fire cover in the vertical direction is reduced compared to the existing inner fire cover, so that the distance H1 between the inner fire cover 1 and the top surface of the outer shell assembly 7 of the gas stove is less than 20 mm (see Figure 17 ), solves the problem that the existing inner fire cover protrudes too high from the glass panel and affects the overall aesthetic effect of the kitchen. In addition, the ignition boss 13 can effectively protect the ignition needle of the burner to prevent overflow from flowing into the ignition needle head and affecting the ignition effect (see Figure 16 ).

[0065] refer to Figure 6 At least one vertically arranged air bleed channel 1322 is provided in the vertical section 132. The upper and lower ends of the air bleed channel 1322 are respectively connected to the inner ring cavity 10 and the corresponding ignition hole 1321, so as to realize the transmission of the outer ring gas in the inner ring cavity 10 upward to the ignition hole. Figure 4-6 In this embodiment, the radial outer end of the vertical section 132 is flush with the lower edge of the enclosure 11 to achieve overall aesthetics; a guide surface 1323 is formed on the side of the vertical section 132 facing the top plate 12, and the guide surface 1323 is an arc-shaped surface or a slope. The lower edge of the guide surface 1323 extends downward to the top of the top plate 12 to quickly guide the overflow dripping onto the ignition boss 13 to the top plate 12 of the inner fire cover 1.

[0066] refer to Figure 4-6Specifically, a plurality of inner ring fire holes 111 are evenly distributed over the area of the enclosure 11 outside the ignition boss 13, which is beneficial to improving the unit gas outlet area and gas outlet uniformity. Since the enclosure 11 is in the shape of a truncated cone with a large lower end and a small upper end, inner ring fires of different heights can be formed, making the inner ring fire power distribution more uniform. A liquid storage tank 121 opening upward is recessed on the top of the top plate 12 so that the inner fire cover 1 can receive the liquid overflowing from the pot, effectively preventing the overflow from flowing into the inner ring fire holes of the inner fire cover 1, thereby avoiding the overflow from clogging the inner ring fire holes 111 and flowing into the interior of the burner, thereby achieving the purpose of easy cleaning of the inner fire cover 1 and the burner. In other embodiments, the top surface of the top plate 12 can be designed as a plane. Of course, the top surface of the top plate 12 can also be designed as an inner inclined surface, which is arranged from the enclosure 11 to the central axis of the inner fire cover and inclined upward.

[0067] Furthermore, a downwardly extending inner ring retaining ring 112 is fixedly provided on the periphery of the lower end of the enclosure 11, so that the inner fire cover 1 can cooperate with the upper annular retaining ring 224 on the outer fire cover 2 to seal the connection. A plurality of fixing columns 113 arranged at circumferential intervals and extending outward are provided on the inner ring retaining ring 112. The plurality of fixing columns 113 are arranged in a one-to-one correspondence with the first connecting portion on the outer fire cover, so that the inner fire cover 1 can be stably and reliably detachably connected and fixed to the top of the outer fire cover 2. A positioning portion 114 extending outward is provided at the position of the outer side wall of the inner ring retaining ring 112 corresponding to the ignition boss 13. The positioning portion is used to strengthen the overall strength of the inner fire cover 1 and is also used to abut against the top of the outer fire cover 2.

[0068] refer to Figure 4-6 Furthermore, the inner fire cover 1 also includes a brim 14, which is integrally formed with the brim 14 extending outward at the lower end periphery of the enclosure 11 of the inner fire cover 1. The orthographic projection of the brim 14 covers the air hole group on the outer fire cover, and a secondary air outlet 20 is formed between the brim 14 and the top of the outer fire cover 2. The secondary air outlet 20 is connected to the air cavity 22 through the air hole group. As a result, on the one hand, the secondary air can only flow out from the gap between the inner fire cover 1 and the outer fire cover 2. The secondary air required for the inner and outer ring fire combustion is supplemented to the burner from the side of the fire cover assembly, so that the inner and outer ring fires can burn more fully, effectively supporting the high-power and stable combustion of the ultra-thin burner, and solving the problem of insufficient firepower of the existing ultra-thin burner. Secondly, the air hole group on the outer fire cover is hidden directly below the inner fire cover 1, so that the liquid overflowing from the pot cannot directly flow downward into the inside of the burner through the air hole group, but can only drip along the inner fire cover 1 to the top of the outer fire cover 2, and then flow out of the outer fire cover 2 along the drainage channel of the outer fire cover 2, thereby making the fire cover assembly and the inside of the burner easier to clean.

[0069] In this embodiment, the brim 14 is conical or truncated cone-shaped with a larger lower end and a smaller upper end, and an outer inclined surface 142 is formed on the top surface of the brim 14. The outer inclined surface 142 is arranged from the surrounding plate 11 to the radially outer side of the brim 14 and inclined downward, so that after dripping onto the brim 14, it can automatically flow downward along the outer inclined surface 14 and out of the inner fire cover 1.

[0070] When the inner fire cover is stacked on top of the outer fire cover, the radially outer end of the brim 14 is arranged opposite the annular guide groove 222 of the outer fire cover 2, so that the annular guide groove 222 can receive the overflow from the brim 14. A first through-hole 141 for the ignition needle to pass through is provided at the position of the brim 14 corresponding to the ignition boss 13. The first through-hole 141 is located directly below the transverse section of the ignition boss 13. The first through-hole 141 downwardly penetrates the positioning portion 114 of the inner fire cover 1 and is connected to the second through-hole on the outer fire cover 2 to prevent the brim from affecting the assembly of the ignition component.

[0071] refer to Figure 1-3 and Figure 9-10 In this embodiment, the ignition divider 3 has an upwardly opening receiving groove (not shown) suitable for receiving the outer fire cover. The lower end of the outer fire cover 2 is inserted into the receiving groove of the ignition divider 3 to make the fire cover assembly thinner in the vertical direction. An inner ring dividing rib 351 and an outer ring dividing rib 352 located on the periphery of the inner ring dividing rib are provided in the receiving groove to divide the receiving groove into an inner ring air channel 31, a middle ring air channel 32 and an outer ring air channel 33 arranged at intervals along the radial direction. The inner ring air channel 31 is connected to the lower end of the central cavity 21 for passing a mixture of inner ring gas and air. The middle ring air channel 32 is connected to the lower end of the air cavity 22 for passing secondary air. The outer ring air channel 33 is connected to the lower end of the outer ring cavity 23 for passing a mixture of outer ring gas and air.

[0072] refer to Figure 9-10 Specifically, an upwardly opening inner ring groove 310 is provided at the center of the ignition distributor 3. A central through hole 311 and multiple inner ring diverter holes 312 are provided at the bottom of the inner ring groove 310. The multiple inner ring diverter holes 312 are circumferentially spaced around the central through hole. The central through hole 311 and the multiple inner ring diverter holes 312 are respectively connected to the inner ring groove 310 to form an inner ring gas channel 31. This enables the ignition distributor to evenly distribute the inner ring gas and air mixture, enhancing the premixing effect and improving the combustion stability of the inner ring fire. In other embodiments, the central through hole 311 or the multiple inner ring diverter holes 312 may be omitted.

[0073] The ignition distributor 3 has an upward-opening middle ring groove 321 located outside the inner ring groove 310. This middle ring groove 321 is located between the inner and outer ring grooves. A plurality of circumferentially spaced middle ring air holes 322 are defined on the bottom surface of the middle ring groove 321. These holes 322 are connected to the middle ring groove 321 to form the middle ring air passage 32, enabling the ignition distributor 3 to evenly distribute the secondary air. A third through hole 323 is defined on the bottom surface of the middle ring groove 321, located between all of the middle ring air holes 322 and the inner ring air passage 31.

[0074] The ignition divider 3 is provided with an outer ring groove 331 which opens upward and is located outside the middle ring groove 321. A plurality of outer ring diversion holes 332 which are arranged circumferentially are provided at the bottom of the outer ring groove 331. The plurality of outer ring diversion holes 332 are respectively connected with the outer ring groove to form an outer ring air channel 33. In this way, the ignition divider can evenly distribute the outer ring fuel gas, which is beneficial to improving the combustion stability of the outer ring fire.

[0075] In this embodiment, the horizontal cross-sectional area of all outer ring diverter holes 332 gradually increases in a clockwise or counterclockwise direction, that is, the area of the outer ring diverter holes 332 at the outlet of the outer ring ejector tube of the burner head is the smallest, and then gradually increases in a clockwise or counterclockwise direction. This makes it easy to uniformly distribute the outer ring gas and air in the ignition distributor 3 by controlling the area of the outer ring diverter holes, ensuring that the mixture of the outer ring gas and air is uniformly ejected upward from the outer ring fire hole, and the flame height remains consistent. In addition, all outer ring diverter holes 332 are arranged at an angle in a clockwise or counterclockwise direction, and the inclination angle of the outer ring diverter holes 332 is 30 to 60 degrees. In this way, by arranging the outer ring diverter holes at an angle, the mixture of the outer ring gas and air will be ejected upward from the ignition distributor 3 at a certain angle, forming a rotating airflow at a certain angle, which is conducive to increasing the rotation of the airflow and further improving the premixing effect of the mixture. In other embodiments, all outer ring diverter holes can be arranged vertically.

[0076] refer to Figure 1-3 and Figure 9-10 Furthermore, the fire distributor 3 is also provided with an annular guide portion 34, which is conical or truncated cone with a larger lower end and a smaller upper end. It is arranged on the periphery of the outer ring air duct 33 and the outer fire cover 2 and is lower than the top of the lower edge of the outer fire cover 2. It is used to drain the overflow from the outer fire cover 2 into the liquid receiving tray.

[0077] Example 3

[0078] refer to Figure 11-13 The difference between this embodiment and embodiment 2 is that the fire cover assembly omits the flame divider, which makes the overall structure of the fire cover assembly simpler, thinner or lower, and has lower manufacturing costs, and does not affect the burner's good easy-to-clean performance and combustion stability.

[0079] Example 4

[0080] refer to Figure 14-16 This embodiment provides a burner, which includes a burner head 4 and a fire cover assembly as described in Example 2. The burner head 4 includes a burner head body 41 and an ejector assembly 42. The ejector assembly 42 is detachably connected to the burner head body 41 to facilitate processing and manufacturing, improve production efficiency, and reduce production costs. Of course, it can also be integrally formed. An upward-opening inner mixing chamber 411, an upward-opening air chamber 412, and an upward-opening outer mixing chamber 413 are provided on the burner head body 41 of the burner head 4. The air chamber 412 is provided between the outer mixing chamber 413 and the inner mixing chamber 411. A secondary air inlet 4121 is provided at the bottom of the air chamber 412 or the lower end of the outer cavity wall.

[0081] The fire cover assembly is mounted on the top of the burner body 41 of the burner 4. The inner air mixing chamber 411 is connected to the inner annular cavity of the inner fire cover 1 through the inner annular air passage of the ignition distributor 3 and the central cavity of the outer fire cover 2. The secondary air inlet 4121 is connected to the secondary air outlet 20 through the air chamber 412, the middle annular air passage of the ignition distributor 3, and the secondary air passage of the outer fire cover 2. The outer air mixing chamber 413 is connected to the outer annular cavity of the outer fire cover 2 through the outer annular air passage of the ignition distributor 3. It can be seen that the above-mentioned fire cover assembly makes the burner easy to clean and has good combustion stability.

[0082] Specifically, the secondary air inlet 4121 is disposed at the lower end of the outer wall of the air chamber 412 and faces the bottom of the outer mixing chamber 413. This prevents cleaning liquid from flowing through the secondary air inlet into the housing assembly of the gas stove when cleaning the burner 4. A downwardly extending inner ring premixing head 4111 and outer ring premixing head 4131 are integrally formed at the bottom of the burner body 41 of the burner 41. The inner ejector pipe in the ejector assembly 42 communicates with the inner mixing chamber 411 via the inner premixing head, and the outer ejector pipe in the ejector assembly 42 communicates with the outer mixing chamber 413 via the outer premixing head.

[0083] refer to Figure 17-18When the burner is installed in the mounting hole of the gas stove's housing assembly 7, the burner protrudes slightly from the top of the housing assembly 7. Specifically, the distance H1 between the burner's flame cover assembly and the top of the housing assembly 7 is less than 20 mm. This effectively addresses the issue of existing burners protruding too high from the glass panel, affecting the overall aesthetics of the gas stove. Furthermore, when the pot holder 8 is mounted on top of the housing assembly 8 and fitted over the burner, the top of the pot holder 8 is higher than the top of the burner, and the distance H2 between the pot holder and the top of the housing assembly is approximately 20 mm. This compares to the existing pot holder height of over 62 mm from the glass panel, effectively addressing the issue of the pot holder appearing awkward after installation.

[0084] Example 5

[0085] refer to Figure 19 The difference between this embodiment and embodiment 4 is that the burner omits the flame divider 3 in the fire cover assembly. When the fire cover assembly is installed on the top of the burner body of the burner 4, the inner mixing chamber 411 is connected to the inner annular cavity of the inner fire cover 1 through the central cavity of the outer fire cover 2. The secondary air inlet 4121 is connected to the secondary air outlet 20 through the air chamber 412 and the secondary air channel of the outer fire cover 2. The outer mixing chamber 413 is directly connected to the outer annular cavity of the outer fire cover 2. As a result, the overall structure of the burner is simpler, the thickness is thinner or the height is lower, the manufacturing cost is lower, and the excellent easy-to-clean performance and combustion stability of the burner are not affected.

[0086] The above descriptions 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, and these all fall within the scope of protection of the present invention.

Claims

1. An external fire cover, characterized in that: The outer fire cover comprises a central cavity (21) with upper and lower ends opened, an air cavity (22) opened downward, and an outer ring cavity (23) opened downward, wherein the air cavity (22) is arranged between the outer ring cavity (23) and the central cavity (21); An air hole group and an outer fire hole group are provided on the top of the outer fire cover (2); the air hole group is in communication with the air cavity (22); and the outer fire hole group is in communication with the outer ring cavity (23).

2. An external fire cover according to claim 1, characterized in that: An annular guide groove (222) is recessed on the top of the outer fire cover (2) and is open upward and is located between the air hole group and the outer fire hole group; and / or A plurality of strip-shaped guide grooves (232) opening upward are recessed on the radially outer side of the top of the outer fire cover (2); all the strip-shaped guide grooves (232) are arranged at intervals along the circumferential direction; each strip-shaped guide groove (232) is arranged along the radial direction; and an outer fire hole group is provided between adjacent strip-shaped guide grooves (232).

3. An external fire cover according to claim 2, characterized in that: The radial inner end of the strip-shaped guide groove (232) is connected to the annular guide groove (222), and / or the strip-shaped guide groove (232) is arranged to be radially outward and tilted downward from the annular guide groove (222).

4. The outer fire cover according to claim 2, characterized in that: A water retaining rib (223) extending upward and located between adjacent strip-shaped guide grooves (232) is integrally formed on the top of the outer fire cover, and the water retaining rib (223) is arranged radially outside the annular guide groove (222).

5. The outer fire cover according to claim 1, characterized in that: A second through hole (220) communicating with the air cavity (22) is provided on the top of the outer fire cover (2); and / or an upper annular retaining ring (224) extending upward is integrally formed on the radial inner side of the top of the outer fire cover (2), and the upper annular retaining ring (224) constitutes the upper end of the central cavity (21).

6. The external fire cover according to claim 1, characterized in that: The radially outer side of the top of the outer fire cover (2) is an outer guide surface, and the radially inner side of the top of the outer fire cover (2) is an inner guide surface or an inner plane. Both the inner guide surface and the outer guide surface are arranged from the inside to the radially outer side and are tilted or curved downward; the outer fire hole group is arranged on the outer guide surface, and the air hole group and the second through hole (220) are both arranged on the inner guide surface or the inner plane.

7. The external fire cover according to claim 1, characterized in that: A plurality of first connecting parts (25) arranged at intervals in the circumferential direction are provided in the air cavity (22), and first fixing holes (251) respectively passing through the first connecting parts (25) and the top of the outer fire cover are provided in the first connecting parts (25); and / or a plurality of second connecting parts (26) arranged at intervals in the circumferential direction are provided in the outer ring cavity (23), and second fixing holes (261) opening downward are provided in the second connecting parts (26).

8. A fire cover assembly, characterized in that: The fire cover assembly comprises an outer fire cover according to any one of claims 1 to 7, and the fire cover assembly further comprises: An inner fire cover (1) is arranged on top of the outer fire cover, the inner fire cover (1) is provided with an inner ring cavity (10) opening downward and an inner fire hole group, the inner fire hole group is connected to the central cavity (21) through the inner ring cavity (10); and / or The fire distributor (3) is arranged at the bottom of the outer fire cover. The fire distributor (3) is provided with an inner ring air channel (31), a middle ring air channel (32) and an outer ring air channel (33). The inner ring air channel (31) is connected to the lower end of the central cavity (21), the middle ring air channel (32) is connected to the lower end of the air cavity (22), and the outer ring air channel (33) is connected to the lower end of the outer ring cavity (23).

9. A fire cover assembly according to claim 8, characterized in that: A brim (14) extending outward is provided on the periphery of the lower end of the inner fire cover (1), and the brim (14) covers the air hole group with its positive projection. A secondary air outlet (20) is formed between the brim (14) and the top of the outer fire cover, and the secondary air outlet (20) is connected to the air cavity (22) through the air hole group.

10. A fire cover assembly according to claim 9, characterized in that: The radial outer end portion of the brim (14) is arranged opposite to the annular guide groove (222) of the outer fire cover.

11. The fire cover assembly according to claim 8, characterized in that: The inner fire cover (1) is in the shape of a truncated cone with a larger lower end and a smaller upper end. An inner fire hole group and an upwardly extending ignition boss (13) are provided on the upper surface of the side wall of the inner fire cover (1). A liquid storage tank (121) is recessed at the center position of the top of the inner fire cover (1).

12. The fire cover assembly according to claim 8, characterized in that: The fire distributor (3) is further provided with an annular guide portion (34), which is arranged on the periphery of the outer ring air channel (33) and the outer fire cover and is used to guide the overflow liquid flowing down from the outer fire cover into the liquid receiving tray.

13. A burner, characterized in that: include: The burner head (4) is provided with an inner air mixing chamber (411) opening upward, an air chamber (412) opening upward, and an outer air mixing chamber (413) opening upward, and a secondary air inlet (4121) is provided at the bottom of the air chamber (412) or the lower end of the outer cavity wall; and An outer fire cover as described in any one of claims 1 to 7 or a fire cover assembly as described in any one of claims 8 to 12, wherein the outer fire cover is arranged on the top of the burner (4), the lower end of the central cavity (21) is connected to the inner mixing chamber (411), the air cavity (22) is connected to the secondary air inlet (4121) through the air chamber (412), and the outer ring cavity (23) is connected to the outer mixing chamber (413).

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