Fire cover assembly and combustor thereof

Abstract

The utility model discloses a fire cover assembly and a burner thereof, the fire cover assembly comprises an outer fire cover, the outer fire cover is provided with a central cavity, an air cavity and an outer ring cavity, the top of the outer fire cover is provided with an air hole group and an outer fire hole group communicated with the outer ring cavity; the inner fire cover covers the top of the outer fire cover, the inner fire cover is provided with an inner ring cavity and an inner fire hole group, the inner fire hole group is communicated with the upper end of the central cavity through the inner ring cavity, a brim extending outwards is arranged on the periphery of the lower end of the inner fire cover, and the orthographic projection of the brim covers the air hole group. A secondary air outlet is formed between the cap brim and the top of the outer fire cover, and the secondary air outlet is communicated with the air cavity through the air hole set. According to the burner cap assembly, the problem that a secondary air channel is reserved between an outer ring burner cap and an inner ring burner cap of an existing burner, so that the internal cleanness of the burner is affected is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas stoves, in particular to a burner cap assembly and a burner thereof Background Technique

[0002] In order to meet the requirements of high-firepower combustion, flame uniformity and firepower adjustment, the outer burner cap and the inner burner cap of the existing stove burner adopt a split and double-ring concentric structure. The common existing method for supplementing secondary air is to reserve a certain channel between the outer burner cap and the inner burner cap, and the secondary air enters the channel through the bottom of the outer burner cap. However, since the channel is in an exposed state, the liquid overflowing from the pot will directly flow downwards and accumulate in the channel, making it very difficult to clean

[0003] The height of the burner cap of the existing burner is usually relatively high, the height from it to the glass panel is more than 40 mm, and the height of the pot support is more than 62 mm. The overall effect is relatively prominent, affecting the beauty of the gas stove and the style matching of the whole machine and the home Summary of the Invention

[0004] The utility model aims to solve at least one of the problems existing in the related art to a certain extent. For this reason, the utility model provides a burner cap assembly, which effectively solves the problem that the secondary air channel reserved between the outer burner cap and the inner burner cap of the existing burner affects the internal cleaning of the burner. The utility model also provides a burner

[0005] According to the provided burner cap assembly, it is realized through the following technical solutions

[0006] A burner cap assembly includes: an outer burner cap, which has a central cavity with openings at both the upper and lower ends, an air cavity with a downward opening, and an outer ring cavity with a downward opening. The air cavity is arranged between the outer ring cavity and the central cavity. An air hole group and an outer fire hole group are arranged at the top of the outer burner cap, and the outer fire hole group is communicated with the outer ring cavity; and an inner burner cap, which is covered on the top of the outer burner cap. The inner burner cap is provided with an inner ring cavity with a downward opening and an inner fire hole group. The inner fire hole group is communicated with the upper end of the central cavity through the inner ring cavity. A brim extending outwards is arranged at the peripheral edge of the lower end of the inner burner cap, and the orthographic projection of the brim covers the air hole group. A secondary air outlet is formed between the brim and the top of the outer burner cap, and the secondary air outlet is communicated with the air cavity through the air hole group

[0007] In some embodiments, an upward-opening annular diversion groove is recessed at the top of the outer burner cap. The annular diversion groove is arranged between the air hole group and the outer fire hole group and is directly below the free end of the brim

[0008] In some embodiments, a plurality of strip-shaped diversion grooves are recessed in the top of the outer fire cap, which are upwardly open and arranged at intervals in the circumferential direction. The strip-shaped diversion grooves are arranged in the radial direction, and the radially inner ends thereof are communicated with the annular diversion groove. An outer fire hole group is arranged between adjacent strip-shaped diversion grooves.

[0009] In some embodiments, the strip-shaped diversion grooves are arranged to be inclined downward and radially outward from the annular diversion groove.

[0010] In some embodiments, a plurality of water blocking ribs extending upward are integrally formed on the top of the outer fire cap. The plurality of water blocking ribs are circumferentially arranged at intervals outside the annular diversion groove. The water blocking ribs are in clearance fit with the outer groove wall of the annular diversion groove, or the water blocking ribs form the upper end of the outer groove wall of the annular diversion groove.

[0011] In some embodiments, the inner fire cap further has an ignition boss with a plurality of ignition holes. The ignition boss is arranged above the brim. A first through hole is opened at the position of the brim corresponding to the ignition boss. A second through hole communicated with the air cavity is arranged at the position of the top of the outer fire cap corresponding to the first through hole.

[0012] In some embodiments, a positioning portion extending downward is integrally formed at the position of the bottom of the brim corresponding to the second through hole. The positioning portion abuts against the outer fire cap. The first through hole vertically penetrates the positioning portion and is communicated with the second through hole.

[0013] In some embodiments, a liquid holding groove with an upward opening is recessed at the central position of the top of the inner fire cap. A guiding surface is provided on the surface of the ignition boss facing the liquid holding groove. The lower end of the guiding surface extends downward to the top of the inner fire cap.

[0014] In some embodiments, an upper annular retaining ring is formed by the upward extension of the upper end of the central cavity. An inner ring retaining ring extending downward and located outside the inner ring cavity is integrally formed at the bottom of the inner fire cap. The inner ring retaining ring is sleeved outside the upper annular retaining ring and abuts against the top of the outer fire cap.

[0015] In some embodiments, a plurality of fixing posts arranged at intervals in the circumferential direction and extending outward are provided on the inner ring retaining ring. The fixing posts abut against the top of the outer fire cap. The fixing posts and the outer fire cap are firmly connected by fasteners.

[0016] In some embodiments, a distributor is further included. The distributor is arranged at the bottom of the outer fire cap. The distributor is provided with an inner ring air passage, a middle ring air passage and an outer ring air passage. The inner ring air passage is communicated with the lower end of the central cavity. The middle ring air passage is communicated with the lower end of the air cavity. The outer ring air passage is communicated with the lower end of the outer ring cavity.

[0017] In some embodiments, the distributor further has an annular diversion part, which is arranged around the outer annular air passage and the outer burner cap and is used for diverting the overflow liquid flowing down from the outer burner cap to the liquid storage tray.

[0018] In some embodiments, the distributor is provided with a third through hole located in the middle annular air passage; and / or the distributor is provided with an outer annular groove with an upward opening, and a plurality of outer annular diversion holes arranged at circumferential intervals are formed at the bottom of the groove of the outer annular groove, and the plurality of outer annular diversion holes are respectively communicated with the outer annular groove to form the outer annular air passage.

[0019] In some embodiments, the horizontal cross-sectional area of all the outer annular diversion holes gradually increases in the clockwise or counterclockwise direction; and / or all the outer annular diversion holes are arranged vertically, or all the outer annular diversion holes are arranged obliquely in the clockwise or counterclockwise direction.

[0020] According to a burner provided above, it is realized by the following technical solutions:

[0021] A burner includes: a burner head, which is provided with an inner mixing chamber with an upward opening, an air chamber with an upward opening, and an outer mixing chamber with an upward opening, and a secondary air inlet is arranged at the bottom of the cavity or the lower end of the outer cavity wall of the air chamber; and a burner cap assembly as described above, the outer burner cap is arranged on the top of the burner head, the lower end of the central cavity is communicated with the inner mixing chamber, the air cavity is communicated with the secondary air inlet through the air chamber, and the outer annular cavity is communicated with the outer mixing chamber.

[0022] Compared with the prior art, the present invention has at least the following beneficial effects:

[0023] 1. For the burner cap assembly of the present invention, by covering the inner burner cap on the top of the outer burner cap, and the orthographic projection of the inner burner cap covers the air hole group on the top of the outer burner cap, the inner annular cavity on the inner burner cap is communicated with the central cavity on the outer burner cap, and a secondary air outlet is formed between the inner burner cap and the top of the outer burner cap. The secondary air outlet is communicated with the air cavity on the outer burner cap through the air hole group. On the one hand, it enables the secondary air to flow out from the gap after the superposition of the inner burner cap and the outer burner cap, so as to supplement the secondary air required for the combustion of the inner and outer rings of the burner from the side of the burner cap assembly, making the combustion of the inner and outer rings more sufficient, effectively supporting the stable combustion of the large firepower of the ultra-thin burner, and solving the problem that the firepower of the existing ultra-thin burner is not large enough. On the other hand, it realizes hiding the air hole group on the outer burner cap directly under the inner burner cap, so that the liquid overflowing from the pot cannot directly flow into the burner interior through the air hole group, effectively solving the problem that the reserved secondary air channel between the outer burner cap and the inner burner cap of the existing burner affects the cleanliness of the burner interior;

[0024] 2. By providing an annular drainage groove on the top of the outer burner cap, which has an upward opening and is located between the air hole group and the outer fire hole group, and the annular drainage groove is arranged opposite to the radially outer end of the brim of the inner burner cap, the outer burner cap can catch the overflow liquid flowing down from the inner burner cap, preventing this part of the overflow liquid from flowing into the burner interior through the air hole group or the outer fire hole group, thus making the burner cap assembly and the burner interior easier to clean;

[0025] 3. By providing a plurality of strip-shaped drainage grooves with upward openings on the radially outer side of the top of the outer burner cap, it is convenient to drain the overflow liquid on the outer burner cap to the outside of the outer burner cap. At the same time, it can prevent the feet of the pot support located directly above the strip-shaped drainage grooves from being burned by the flame, which is beneficial to reducing the temperature rise of the pot support and the panel of the gas stove. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is an exploded view of the burner cap assembly in Embodiment 1 of the present utility model;

[0027] Figure 2 is a schematic structural diagram of the burner cap assembly in Embodiment 1 of the present utility model;

[0028] Figure 3 is a cross-sectional view of the burner cap assembly in Embodiment 1 of the present utility model;

[0029] Figure 4 is a schematic structural diagram of the inner burner cap in Embodiment 1 of the present utility model Figure 1 ;

[0030] Figure 5 is a schematic structural diagram of the inner burner cap in Embodiment 1 of the present utility model Figure 2 ;

[0031] Figure 6 is a cross-sectional view of the inner burner cap in Embodiment 1 of the present utility model;

[0032] Figure 7 is a schematic structural diagram of the outer burner cap in Embodiment 1 of the present utility model;

[0033] Figure 8 is a bottom view of the outer burner cap in Embodiment 1 of the present utility model;

[0034] Figure 9 is an exploded view of the burner cap assembly in Embodiment 2 of the present utility model;

[0035] Figure 10 is a schematic structural diagram of the burner cap assembly in Embodiment 2 of the present utility model;

[0036] Figure 11 is a cross-sectional view of the burner cap assembly in Embodiment 2 of the present utility model;

[0037] Figure 12It is a schematic structural diagram of the flame divider in Embodiment 2 of the present utility model;

[0038] Figure 13 It is a bottom view of the flame divider in Embodiment 2 of the present utility model;

[0039] Figure 14 It is an exploded view of the burner in Embodiment 3 of the present utility model;

[0040] Figure 15 It is a schematic structural diagram of the burner in Embodiment 3 of the present utility model;

[0041] Figure 16 It is a cross-sectional view of the burner in Embodiment 3 of the present utility model;

[0042] Figure 17 It is a right view of the gas stove in Embodiment 3 of the present utility model;

[0043] Figure 18 It is a schematic structural diagram of the gas stove in Embodiment 3 of the present utility model;

[0044] Figure 19 It is a cross-sectional view of the burner in Embodiment 4 of the present utility model.

[0045] In the figure: 1 - inner fire cap, 10 - inner ring cavity, 11 - enclosing plate, 111 - inner ring fire holes, 112 - inner ring retaining ring, 113 - fixing post, 114 - positioning part, 12 - top plate, 121 - liquid holding groove, 13 - ignition boss, 131 - horizontal section, 132 - vertical section, 1321 - ignition hole, 1322 - air guiding channel, 1323 - guiding surface, 14 - brim, 141 - first through hole, 142 - outer inclined surface;

[0046] 2 - outer fire cap, 20 - secondary air outlet, 21 - central cavity, 22 - air cavity, 220 - second through hole, 221 - secondary air holes, 222 - annular diversion groove, 223 - water retaining rib, 224 - upper annular retaining ring, 23 - outer ring cavity, 231 - outer ring fire holes, 232 - strip-shaped diversion groove, 25 - first connecting part, 251 - first fixing hole, 26 - second connecting part, 261 - second fixing hole;

[0047] 3 - flame divider, 31 - inner ring air duct, 310 - inner ring groove, 311 - central through hole, 312 - inner ring shunt holes, 32 - middle ring air duct, 321 - middle ring groove, 322 - middle ring air holes, 323 - third through hole, 33 - outer ring air duct, 331 - outer ring groove, 332 - outer ring shunt holes, 333 - annular support platform, 334 - mounting post, 34 - annular diversion part, 351 - inner ring separating rib, 352 - outer ring separating rib;

[0048] 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-ejector assembly;

[0049] 5-liquid pan; 6-ignition assembly; 7-housing assembly; 8-pot support. Specific embodiments

[0050] The following embodiments illustrate the present invention, but the present invention is not limited by these embodiments. Modifying the specific embodiments of the present invention or making equivalent substitutions for some technical features without departing from the spirit of the present invention shall be covered within the scope of the technical solutions claimed in the present invention.

[0051] Embodiment 1

[0052] Reference Figures 1 - 8 , this embodiment provides a burner cap assembly, including an inner burner cap 1 and an outer burner cap 2. The outer burner cap 2 is an integrally formed structure, which has a central cavity 21 with openings at both upper and lower ends, an air cavity 22 with a downward opening, and an outer ring cavity 23 with a downward opening. The air cavity 22 is arranged between the outer ring cavity 23 and the central cavity 21. The central cavity 2 is used for the mixture of inner ring gas and air to pass through, the air cavity 22 is used for secondary air to pass through, and the outer ring cavity 23 is used for the mixture of outer ring gas and air to pass through. On the radially inner and outer sides of the top of the outer burner cap 2, there are respectively an air hole group for secondary air to pass through and an outer fire hole group for outer ring gas to pass through. The air hole group includes a plurality of secondary air holes 221 arranged at circumferential intervals, and this air hole group is connected to the air cavity 22 to form a secondary air passage; the outer fire hole group includes a plurality of outer ring fire holes 231 arranged at intervals, and this outer fire hole group is connected to the outer ring cavity 23. Thus, compared with the existing outer burner cap, the outer burner cap 2 in this embodiment can not only meet the requirements of the outer ring fire, but also has the function of transmitting inner ring gas and secondary air; in addition, since both the outer ring fire holes and the secondary air holes 221 are directly designed on the upper surface of the outer burner cap 2, it is beneficial to reduce the height of the outer burner cap 2 and meet the ultra-thin requirements.

[0053] The inner fire cover 1 is of an integrally formed structure. The inner fire cover 1 is disposed on the top of the outer fire cover 2 and is detachably connected to the outer fire cover 2 to form a whole. At this time, the inner fire cover is superimposed on the top of the outer fire cover. The inner fire cover 1 is provided with an inner ring cavity 10 with a downward opening and an inner fire hole group. The inner fire hole group is communicated with the upper end of the central cavity 21 through the inner ring cavity 10. Further, a brim 14 extending outward is integrally formed at the peripheral edge of the lower end of the inner fire cover 1. The orthographic projection of the brim 14 covers the air hole group of the outer fire cover 2. 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 communicated with the air cavity 22 through the air hole group. Thus, on the one hand, the secondary air flows out from the gap after the inner fire cover 1 and the outer fire cover 2 are superimposed, realizing supplementing the secondary air required for the combustion of the inner and outer ring fires for the burner from the side of the fire cover assembly, making the combustion of the inner and outer ring fires more sufficient, effectively supporting the stable combustion of the large firepower of the ultra-thin burner, and solving the problem that the firepower of the existing ultra-thin burner is not large enough; on the other hand, the air hole group on the outer fire cover is hidden directly below the inner fire cover 1, so that the overflowing liquid cannot directly flow downward into the burner interior 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 outer fire cover 2, thereby making the fire cover assembly and the interior of the burner easier to clean, effectively solving the problem that the reserved secondary air channel between the outer ring fire cover and the inner ring fire cover of the existing burner affects the cleaning of the interior of the burner.

[0054] Reference Figures 1 - 6 , in this embodiment, the caliber of the inner fire cover 1 gradually decreases from bottom to top, so that the inner fire cover is in a conical or frustum shape. The inner fire cover 1 includes a surrounding plate 11, a top plate 12, an ignition boss 13 and a brim 14. The surrounding plate 11 is in a frustum shape with a large lower end and a small upper end and constitutes the side wall of the inner fire cover. An inner fire hole group is provided on the surrounding plate 11. The inner fire hole group is composed of a plurality of inner ring fire holes 111 arranged at circumferential intervals. 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 is integrally formed with it. The top plate 12 and the surrounding plate 11 jointly enclose an inner ring cavity 10 with a downward opening. The inner ring cavity 10 is communicated with the plurality of inner ring fire holes 111. The ignition boss 13 is fixedly connected to the outer wall surface of the surrounding plate 11 and is integrally formed with it. It includes a horizontal section 131 and a vertical section 132 fixedly connected into a "7" shape. The horizontal section 131 is fixedly connected to the outer wall surface of the surrounding plate 11 through the vertical section 132. On the side of the vertical section 132 facing away from the top plate 12, a plurality of ignition holes 1321 located directly below the horizontal section 131 and communicated with the inner ring cavity 10 are provided.

[0055] It can be seen that by designing the shroud 11 of the inner burner cap 1 as a frustum of a cone, and fixedly connecting the top plate 12 to the upper end or the top of the shroud 11, and fixedly connecting the ignition boss 13 to the outer wall surface of the shroud 11, compared with the existing inner burner cap, the height of the inner burner cap in the vertical direction is reduced, so that the distance H1 between the inner burner cap 1 and the top surface of the outer shell assembly 7 of the gas stove is less than 20 mm (see Figure 17 ), solving the problem that the existing inner burner cap protrudes too high from the glass panel and affects the overall aesthetic effect of the kitchen. In addition, the ignition needle of the burner can be effectively protected by the ignition boss 13, preventing overflow liquid from flowing onto the head of the ignition needle and affecting the ignition effect (see Figure 16 ).

[0056] Reference Figure 6 , at least one air guiding channel 1322 arranged vertically is provided in the vertical section 132. The upper and lower ends of the air guiding channel 1322 are respectively communicated with the inner ring cavity 10 and the corresponding ignition hole 1321 to realize upward transmission of the outer ring gas in the inner ring cavity 10 to the ignition hole. Reference Figures 4 - 6 , in this embodiment, the radially outer end of the vertical section 132 is flush with the lower edge of the shroud 11 to achieve overall aesthetics; a guiding surface 1323 is formed on the surface of the vertical section 132 facing the top plate 12. The guiding surface 1323 is an arc surface or an inclined surface, and the lower edge of the guiding surface 1323 extends downward to the top of the top plate 12 to quickly guide the overflow liquid dripping onto the ignition boss 13 to the top plate 12 of the inner burner cap 1.

[0057] Reference Figures 4 - 6 , specifically, a plurality of inner ring fire holes 111 are uniformly distributed in the area of the shroud 11 outside the ignition boss 13. This is beneficial to improving the unit gas outlet area and gas outlet uniformity. Since the shroud 11 is in the shape of a frustum of a cone with a larger lower end and a smaller upper end, different heights of inner ring fires can be formed, making the inner ring fire power distribution more uniform. A liquid receiving groove 121 with an upward opening is recessed in the top of the top plate 12, so that the inner burner cap 1 can receive the liquid overflowing from the pot, effectively preventing the overflow liquid from flowing into the inner ring fire holes of the inner burner cap 1, and further avoiding the overflow liquid from blocking the inner ring fire holes 111 and flowing into the burner interior, thus achieving the purpose of easy cleaning of the inner burner cap 1 and the burner. In other embodiments, the top surface of the top plate 12 can be designed as a flat surface. Of course, the top surface of the top plate 12 can also be designed as an inner inclined surface, and the inner inclined surface is arranged obliquely upward from the shroud 11 towards the central axis of the inner burner cap.

[0058] Furthermore, an inner ring retaining ring 112 extending downward is fixedly provided at the peripheral edge of the lower end of the shroud 11, so as to be fitted and sealingly connected with the upper annular retaining ring 224 on the inner fire cover 1 and the outer fire cover 2. A plurality of fixing posts 113 arranged at circumferential intervals and extending outward are provided on the inner ring retaining ring 112, and the plurality of fixing posts 113 are arranged in one-to-one correspondence with the first connecting portions on the outer fire cover, so as to detachably connect and fix the inner fire cover 1 stably and reliably on the top of the outer fire cover 2. A positioning portion 114 extending outward is provided on the outer side wall of the inner ring retaining ring 112 corresponding to the position of the ignition boss 13. The positioning portion is used to strengthen the overall strength of the inner fire cover 1 and also used to abut against the top of the outer fire cover 2.

[0059] Reference Figures 4 - 6 , an eaves 14 extending outward is integrally formed at the peripheral edge of the lower end of the shroud 11 of the inner fire cover 1. In this embodiment, the eaves 14 is in a conical shape or a frustum shape with a larger lower end and a smaller upper end, so that an outer inclined surface 142 is formed on the top surface of the eaves 14. The outer inclined surface 142 is arranged to incline downward from the shroud 11 towards the radial outer side of the eaves 14, so that the liquid dripping onto the eaves 14 can automatically flow out of the inner fire cover 1 downward along the outer inclined surface 14.

[0060] After the inner fire cover is stacked on the top of the outer fire cover, the radially outer end of the eaves 14 is arranged opposite to the annular diversion groove 222 of the outer fire cover 2, so that the annular diversion groove 222 can catch the overflow liquid flowing down from the eaves 14. A first through hole 141 for the ignition needle to pass through is provided at the position of the eaves 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 penetrates downward through the positioning portion 114 of the inner fire cover 1 and is communicated with the second through hole on the outer fire cover 2, so as to avoid affecting the assembly of the ignition component due to the setting of the eaves.

[0061] Reference Figures 7 - 8 , furthermore, an annular diversion groove 222 with an upward opening and located between the air hole group and the outer fire hole group is recessed on the top of the outer fire cover 2. The annular diversion groove 222 is arranged opposite to the radial outer edge of the inner fire cover 1, that is, the annular diversion groove 222 is located directly below the free end of the eaves 14 (see Figure 3 ), and is used to catch the overflow liquid (i.e., the overflow) flowing down from the inner fire cover 1, so as to prevent this part of the overflow liquid from flowing into the outer ring fire holes 231 or the secondary air holes, so as to solve the problem that the reserved secondary air channel between the outer ring fire cover and the inner ring fire cover of the existing burner affects the internal cleanliness of the burner.

[0062] Further, a plurality of strip-shaped diversion grooves 232 with upward openings are concavely provided on the radially outer side of the top of the outer burner cap 2. All the strip-shaped diversion grooves 232 are arranged at intervals in the circumferential direction. The strip-shaped diversion grooves 232 are arranged in the radial direction, and the radially inner ends of the strip-shaped diversion grooves 232 are respectively communicated with the annular diversion groove 222 to form a drainage channel, so that the overflow liquid in the annular diversion groove can flow out of the outer burner cap 2 along the strip-shaped diversion grooves 232. In this way, the outer burner cap 2 has an overflow liquid drainage function, and thus has good easy-to-clean performance. In this embodiment, the strip-shaped diversion grooves 232 are arranged obliquely downward from the annular diversion groove 222 toward the radially outer side, so as to quickly drain the overflow liquid out of the outer burner cap 2.

[0063] Specifically, the number of the strip-shaped diversion grooves 232 is the same as the number of the feet of the pot support, and the strip-shaped diversion grooves 232 are arranged opposite to the feet of the pot support (see Figure 18 ), so that the strip-shaped diversion grooves 232 can catch the overflow liquid flowing down from the feet of the pot support, and can also prevent the feet of the pot support from being burned by the flame, which is beneficial to reducing the temperature rise of the pot support and the panel of the gas stove. An outer fire hole group is provided between adjacent strip-shaped diversion grooves 232, that is, the outer ring fire holes 231 are uniformly distributed in the area of the top of the outer burner cap 2 between adjacent strip-shaped diversion grooves 232, so as to realize the zoning of the outer ring fire power while making the outer ring fire power distribution more uniform and the fire power range wider.

[0064] Reference Figures 7 - 8 , further, a water retaining rib 223 extending upward and located between adjacent strip-shaped diversion grooves 232 is integrally formed on the top of the outer burner cap 2. The water retaining rib 223 is arranged on the radially outer side of the annular diversion groove 222. The height of the water retaining rib 223 is any one of 1.5 mm, 2 mm or 2.5 mm. In this embodiment, the water retaining rib 223 constitutes the upper end of the outer groove wall of the annular diversion groove 222. In other embodiments, the water retaining rib can be arranged at intervals with the outer groove wall of the annular diversion groove 222. Thus, when the overflow liquid from the inner burner cap 1 flows downward into the annular diversion groove 222 of the outer burner cap 2, due to the blocking effect of the water retaining rib 223, it will not flow into the outer ring fire holes.

[0065] Reference Figures 7 - 8 , further, a second through hole 220 communicated with the air cavity 22 is provided on the top of the outer burner cap 2. The second through hole 220 is for the ignition needle to pass through. A positioning portion 114 extending downward is integrally formed at the bottom of the brim 14 corresponding to the position of the second through hole 220. The positioning portion 114 abuts against the outer burner cap 2. The first through hole 141 on the inner burner cap vertically penetrates the positioning portion 114 and is communicated with the second through hole 220.

[0066] On the radial inner side of the top of the outer burner cap 2, an upwardly extending upper annular retaining ring 224 is integrally formed, and the upper annular retaining ring 224 constitutes the upper end of the central cavity 21. On the bottom of the inner burner cap 1, an inner ring retaining ring 112 that extends downward and is located outside the inner ring cavity 10 is integrally formed. The inner ring retaining ring 112 is sleeved outside the upper annular retaining ring 224 and abuts against the top of the outer burner cap 2, so as to facilitate the cooperation between the upper annular retaining ring 224 and the upper annular retaining ring 22, enabling the inner burner cap and the outer burner cap to be hermetically connected in cooperation.

[0067] In this embodiment, the radial outer side of the top of the outer burner cap 2 is an outer guiding surface, and the radial inner side of the top of the outer burner cap 2 is an inner guiding surface or an inner flat surface. Both the inner guiding surface and the outer guiding surface are arranged to be inclined or curved from the inside to the radial outside and downward, so that the outer burner cap 2 is in a conical shape or a frustum shape with a larger lower end and a smaller upper end, which is beneficial to reducing the thickness of the outer burner cap. The outer flame hole group and the strip-shaped drainage groove are both arranged on the outer guiding surface, so that the outer flame hole group and the strip-shaped drainage groove are both arranged obliquely in the radial direction. While facilitating the drainage of overflow liquid and gas, different heights of outer ring flames can be formed, making the distribution of the outer ring firepower more uniform; the air hole group and the second through hole 220 are both arranged on the inner guiding surface or the inner flat surface; the annular drainage groove can be arranged at the radial outer end of the inner guiding surface or the inner flat surface, or at the radial inner end of the outer guiding surface.

[0068] Reference Figure 8 , in the air cavity 22, a plurality of first connecting parts 25 are arranged at circumferential intervals and close to the central cavity 21. The first connecting parts 25 are integrally formed with the cavity top surface and the cavity inner side wall surface of the air cavity 22 respectively. First fixing holes 25 are formed on the first connecting parts 25 and penetrate through them and the top of the outer burner cap 2 respectively. On the inner ring retaining ring 112, a plurality of fixing posts 113 are arranged at circumferential intervals and extend outward. The plurality of fixing posts 113 are arranged in one-to-one correspondence with the plurality of first connecting parts 25, and the fixing posts 113 are tightly connected with corresponding first connecting part channel fasteners (such as screws), so that the outer burner cap 2 and the inner burner cap are detachably connected as a whole.

[0069] In addition, in the outer ring cavity 23, a plurality of second connecting parts 26 are arranged at circumferential intervals and far from the air cavity 22. The second connecting parts 26 are integrally formed with the cavity top surface and the cavity outer side wall surface of the outer ring cavity 23 respectively. The second connecting parts 26 are provided with second fixing holes 261 with downward openings, so that it is convenient for the outer burner cap 2 to be detachably connected with the sub-fire burner through the second connecting parts 26 as a whole.

[0070] Embodiment 2

[0071] Reference Figures 9 - 13, The difference between this embodiment and Embodiment 1 is that the burner cap assembly further includes a burner 3, which is arranged at the bottom of the outer burner cap 2 and is detachably connected to the outer burner cap 2. The burner 3 is provided with an inner ring air passage 31, a middle ring air passage 32, and an outer ring air passage 33. The middle ring air passage 32 is located between the outer ring air passage 33 and the inner ring air passage 31. The inner ring air passage 31 is connected to the lower end of the central cavity 21 and is used for the mixture of inner ring gas and air to pass through. The middle ring air passage 32 is connected to the lower end of the air cavity 22 and is used for the secondary air to pass through. The outer ring air passage 33 is connected to the lower end of the outer ring cavity 23 and is used for the mixture of outer ring gas and air to pass through. In this way, the burner 3 has the function of transmitting the inner ring gas, the secondary air, and the outer ring gas.

[0072] In this embodiment, the burner 3 is an integrally formed structure. The burner 3 has a receiving groove (not shown in the figure) with an upward opening. The lower end of the outer burner cap 2 is inserted into the receiving groove (see Figure 10 ), so that the thickness of the burner cap assembly in the vertical direction is thinner. Refer to Figure 11 , an inner ring air passage 31, a middle ring air passage 32, and an outer ring air passage 33 are formed in the receiving groove at intervals in the radial direction. In this embodiment, an inner ring separating rib 351 and an outer ring separating rib 352 located outside the inner ring separating rib are provided in the receiving groove to separate the receiving groove into an inner ring groove 310, a middle ring groove, and an outer ring groove arranged at intervals in the radial direction.

[0073] Refer to Figures 12 - 13 , specifically, an inner ring groove 310 with an upward opening is provided at the center position of the burner 3. A central through hole 311 and a plurality of inner ring shunt holes 312 are opened on the bottom surface of the inner ring groove 310. The plurality of inner ring shunt holes 312 are circumferentially arranged at intervals around the central through hole. The central through hole 311 and the plurality of inner ring shunt holes 312 are respectively connected to the inner ring groove 310 to form the inner ring air passage 31. In this way, the burner can evenly distribute the mixture of inner ring gas and air, enhance the premixing effect, and improve the combustion stability of the inner ring flame. In other embodiments, the central through hole 311 or the plurality of inner ring shunt holes 312 can be omitted.

[0074] The burner 3 is provided with a middle ring groove 321 with an upward opening and located outside the inner ring groove 310. The middle ring groove 321 is located between the inner ring groove and the outer ring groove. A plurality of middle ring air holes 322 arranged at intervals in the circumferential direction are opened on the bottom surface of the middle ring groove 321. The plurality of middle ring air holes 322 are respectively connected to the middle ring groove 321 to form the middle ring air passage 32. In this way, the burner 3 can evenly distribute the secondary air. A third through hole 323 is opened on the bottom surface of the middle ring groove 321. The third through hole 323 is located between all the middle ring air holes 322 and the inner ring air passage 31 and is arranged corresponding to the second through hole 220 on the outer burner cap 2.

[0075] The gas distributor 3 is provided with an outer ring groove 331 that opens upward and is located outside the middle ring groove 321. A plurality of outer ring diversion holes 332 arranged at circumferential intervals are formed at the bottom of the outer ring groove 331. The plurality of outer ring diversion holes 332 are respectively communicated with the outer ring groove to form an outer ring air passage 33, so that the gas distributor can evenly distribute the outer ring gas, which is beneficial to improving the combustion stability of the outer ring flame.

[0076] In this embodiment, the horizontal cross-sectional area of all the outer ring diversion holes 332 gradually increases in the clockwise or counterclockwise direction, that is, the area of the outer ring diversion hole 332 at the outlet of the outer ring injection pipe of the burner head is the smallest, and then gradually increases along the clockwise or counterclockwise direction. In this way, it is convenient to control the area of the outer ring diversion holes to make the mixture of the outer ring gas and air in the gas distributor 3 uniform, ensuring that the mixture of the outer ring gas and air evenly sprays upward from the outer ring flame holes and the flame height remains consistent. Further, all the outer ring diversion holes 332 are arranged obliquely in the clockwise or counterclockwise direction, and the inclination angle of the outer ring diversion holes 332 is 30-60 degrees. In this way, through the obliquely arranged outer ring diversion holes, the mixture of the outer ring gas and air will spray upward from the gas distributor 3 at a certain angle to form a rotating air flow at a certain angle, which is beneficial to increasing the rotation of the air flow and further improving the premixing effect of the mixture. In other embodiments, all the outer ring diversion holes can be arranged vertically.

[0077] Reference Figures 1 - 3 and Figures 9 - 10 Furthermore, the gas distributor 3 is further provided with an annular diversion part 34. The annular diversion part 34 is in a conical shape or a frustum shape with a larger lower end and a smaller upper end. It is arranged outside the outer ring air passage 33 and the outer fire cap 2 and lower than the top of the lower edge of the outer fire cap 2, and is used to divert the overflow liquid flowing down from the outer fire cap 2 to the liquid receiving tray, so that the gas distributor has the function of overflow liquid diversion.

[0078] Embodiment 3

[0079] Reference Figures 14 - 16 This embodiment provides a burner, which includes a burner head 4 and a fire cap assembly as described in Embodiment 2. The burner head 4 includes a burner head body 41 and an injection assembly 42. The injection assembly 42 is detachably connected to the burner head body 41, which is convenient for processing and manufacturing, improving production efficiency, and reducing manufacturing costs. Of course, it can also be integrally formed. An inner mixing chamber 411 that opens upward, an air chamber 412 that opens upward, and an outer mixing chamber 413 that opens upward are provided on the burner head body 41 of the burner head 4. The air chamber 412 is arranged between the outer mixing chamber 413 and the inner mixing chamber 411, and a secondary air inlet 4121 is provided at the bottom of the cavity or the lower end of the outer cavity wall of the air chamber 412.

[0080] The burner cap assembly is covered on the top of the burner body 41 of the burner head 4. The internal mixing chamber 411 is sequentially connected to the inner ring cavity of the inner burner cap 1 through the inner ring air passage of the distributor 3 and the central cavity of the outer burner cap 2. The secondary air inlet 4121 is sequentially connected to the secondary air outlet 20 through the air chamber 412, the middle ring air passage of the distributor 3, and the secondary air passage of the outer burner cap 2. The external mixing chamber 413 is connected to the outer ring cavity of the outer burner cap 2 through the outer ring air passage of the distributor 3. It can be seen that through the above burner cap assembly, the burner has good easy-to-clean performance and combustion stability performance.

[0081] Specifically, the secondary air inlet 4121 is arranged at the lower end of the outer cavity wall surface of the air chamber 412, and the secondary air inlet 4121 faces the bottom of the external mixing chamber 413, so as to prevent the cleaning liquid from flowing into the housing assembly of the gas stove from the secondary air inlet when cleaning the burner head 4. An inner ring premixing head 4111 and an outer ring premixing head 4131 extending downward are integrally formed at the bottom of the burner body 41 of the burner head 4. The inner injection tube in the injection assembly 42 is connected to the internal mixing chamber 411 through the inner ring premixing head, and the outer injection tube in the injection assembly 42 is connected to the external mixing chamber 413 through the outer ring premixing head.

[0082] Reference Figures 17 - 18 , when the above burner is installed in the installation hole of the housing assembly 7 of the gas stove, the height of the burner slightly protrudes from the top of the housing assembly 7, that is, the distance H1 between the burner cap assembly of the burner and the top of the housing assembly 7 is less than 20mm. Compared with the height of the burner cap of the existing burner above the glass panel being more than 40mm, it effectively solves the problem that the existing burner protrudes too high above the glass panel and affects the overall aesthetic effect of the gas stove. In addition, when the pot support 8 is installed on the top of the housing assembly 8 and sleeved outside the burner, the top of the pot support 8 is higher than the top of the burner, and the distance H2 between the top of the pot support and the top of the housing assembly is about 20mm. Compared with the height of the existing pot support above the glass panel being more than 62mm, it effectively solves the problem that the overall effect is relatively abrupt after the existing pot support is installed.

[0083] Embodiment 4

[0084] Reference Figure 19 , the difference between this embodiment and Embodiment 3 is that the distributor 3 in the burner cap assembly is omitted in the burner. After the burner cap assembly is covered on the top of the burner body of the burner head 4, the internal mixing chamber 411 is sequentially connected to the inner ring cavity of the inner burner cap 1 through the central cavity of the outer burner cap 2. The secondary air inlet 4121 is sequentially connected to the secondary air outlet 20 through the air chamber 412 and the secondary air passage of the outer burner cap 2. The external mixing chamber 413 is directly connected to the outer ring cavity of the outer burner cap 2. Thus, the overall structure of the burner is simpler, the thickness is thinner or the height is lower, the manufacturing cost is lower, and it does not affect the good easy-to-clean performance and combustion stability performance of the burner.

[0085] The above are only some embodiments of the present utility model. For those of ordinary skill in the art, without departing from the inventive concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A fire cover assembly, characterized in that: include: The outer fire cover (2) 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), and an air hole group and an outer fire hole group are arranged on the top of the outer fire cover (2), and the outer fire hole group is connected to the outer ring cavity (23); and The inner fire cover (1) is arranged on the top of the outer fire cover (2), 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 with the upper end of the central cavity (21) through the inner ring cavity (10). A brim (14) extending outward is provided at the periphery of the lower end of the inner fire cover (1), and the positive projection of the brim (14) covers the air hole group. A secondary air outlet (20) is formed between the brim (14) and the top of the outer fire cover (2), and the secondary air outlet (20) is connected to the air cavity (22) through the air hole group.

2. A fire cover assembly according to claim 1, characterized in that: An upwardly opening annular guide groove (222) is recessed on the top of the outer fire cover (2); the annular guide groove (222) is arranged between the air hole group and the outer fire hole group and is located directly below the free end of the brim (14).

3. A fire cover assembly according to claim 2, characterized in that: A plurality of strip guide grooves (232) opening upward and arranged at intervals in the circumferential direction are also recessed on the top of the outer fire cover (2); the strip guide grooves (232) are arranged in the radial direction, and their radial inner ends are connected to the annular guide groove (222); and an outer fire hole group is provided between adjacent strip guide grooves (232).

4. A fire cover assembly according to claim 3, characterized in that: The strip-shaped guide groove (232) is arranged from the annular guide groove (222) radially outward and inclined downward.

5. A fire cover assembly according to claim 2, characterized in that: A plurality of water retaining ribs (223) extending upward are integrally formed on the top of the outer fire cover (2); the plurality of water retaining ribs (223) are circumferentially spaced and arranged at the periphery of the annular guide groove (222); the water retaining ribs (223) are clearance-matched with the outer groove wall of the annular guide groove (222), or the water retaining ribs (223) constitute the upper end of the outer groove wall of the annular guide groove (222).

6. A fire cover assembly according to claim 1, characterized in that: The inner fire cover (1) is also provided with an ignition boss (13) having a plurality of ignition holes (1321); the ignition boss (13) is arranged above the brim (14); a first through hole (141) is provided at a position of the brim (14) corresponding to the ignition boss (13); and a second through hole (220) connected to the air cavity (22) is provided at a position of the top of the outer fire cover (2) corresponding to the first through hole (141).

7. A fire cover assembly according to claim 6, characterized in that: A positioning portion (114) extending downward is integrally formed at a position of the bottom of the brim (14) corresponding to the second through hole (220), the positioning portion (114) abuts against the outer fire cover (2), and the first through hole (141) vertically penetrates the positioning portion (114) and is connected to the second through hole (220).

8. A fire cover assembly according to claim 1, characterized in that: A liquid storage tank (121) opening upward is recessed at the center of the top of the inner fire cover (1), and a guide surface (1323) is provided on the side of the ignition boss (13) facing the liquid storage tank (121), wherein the lower end of the guide surface (1323) extends downward to the top of the inner fire cover (1).

9. A fire cover assembly according to any one of claims 1 to 8, characterized in that: It also includes a flame divider (3), which is arranged at the bottom of the outer fire cover (2), and the flame 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 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).

10. A fire cover assembly according to claim 9, characterized in that: The fire distributor (3) is also provided with an annular guide portion (34), which is arranged on the periphery of the outer ring air passage (33) and the outer fire cover (2) and is used to guide the overflow liquid flowing down from the outer fire cover (2) into the liquid receiving tray.

11. A fire cover assembly according to claim 10, characterized in that: The ignition divider (3) is provided with a third through hole located in the middle ring air duct (32); and / or the ignition divider (3) is provided with an outer ring groove (331) opening upward, and a plurality of outer ring diverter holes (332) arranged circumferentially at intervals are provided at the bottom of the groove of the outer ring groove (331), and the plurality of outer ring diverter holes (332) are respectively connected to the outer ring groove to form the outer ring air duct (33).

12. A fire cover assembly according to claim 11, characterized in that: The horizontal cross-sectional areas of all the outer ring diverter holes (332) gradually increase in a clockwise or counterclockwise direction; and / or All of the outer ring flow diversion holes (332) are arranged vertically, or all of the outer ring flow diversion holes (332) are arranged obliquely in a clockwise or counterclockwise direction.

13. A burner, characterized in that: include: The furnace 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 chamber wall; A fire cover assembly as described in any one of claims 1 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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