WO2019149170A1 - 一种燃气灶具的燃烧器火盖 - Google Patents

一种燃气灶具的燃烧器火盖 Download PDF

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Publication number
WO2019149170A1
WO2019149170A1 PCT/CN2019/073380 CN2019073380W WO2019149170A1 WO 2019149170 A1 WO2019149170 A1 WO 2019149170A1 CN 2019073380 W CN2019073380 W CN 2019073380W WO 2019149170 A1 WO2019149170 A1 WO 2019149170A1
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WIPO (PCT)
Prior art keywords
fire
hole
fire cover
wall
boss
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PCT/CN2019/073380
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English (en)
French (fr)
Inventor
戎胡斌
邵海忠
吴丽波
王帅东
郑军妹
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宁波方太厨具有限公司
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Publication of WO2019149170A1 publication Critical patent/WO2019149170A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes

Definitions

  • the invention relates to the technical field of gas cookers, in particular to a burner fire cover of a gas cooker.
  • the traditional burner fire cover sold on the market is mostly slotted, that is, a fire escape groove is milled at the top of the fire cover body, and the burner cover is placed at the fire escape groove by the fire cover body. Disconnected, thus easily deforming the body of the fire cover, thereby affecting the ignition effect.
  • the Chinese patent CN202813375U discloses a similar fire-transmitting structure.
  • a plurality of outer ring fire-breathing holes are arranged on the outer ring fire-sparking ring of the gas burner head, and an outer ring fire-transmitting device is further disposed on the outer ring fire-breathing right, and the outer ring fire-transmitting device is installed a boss on the inner side wall of the outer ring fire ring, an outer ring fire hole and an outer ring fire transfer groove provided on the boss and the outer ring fire ring, the outer ring fire and the outer ring pass fire
  • the slots are connected to each other, and the outer ring fire passage hole and the outer ring fire transfer groove are connected with an outer ring fire injection hole to realize rapid fire transfer;
  • the fire transfer groove of the fire transfer structure is open type, and the fire transfer is linear, that is, the fire transfer groove is exposed on the surface of the outer ring fire cover.
  • the design of the fire has the advantage that the secondary air supply in the fire transfer tank is sufficient.
  • the open fire transfer trough can ensure the replenishment of the secondary air when the flame in the fire trough is burned, which is beneficial to the flame combustion and the fire, and has the characteristics of rapid fire transmission.
  • the open fire trough can easily cause the passage of the fire trough, that is, the soup flowing down from the bottom of the pot can easily flow into the fire trough, and the effect is blocked after the blockage. Fire performance, which is also the main reason for the current fire block clogging maintenance; Second, the open fire trough requires a high demand for the cooker damper, because the excessive air volume will cause the airflow speed to be too large, resulting in excessive airflow. When burning, it is separated from the flame or fire. Therefore, the structure of the open fire transfer trough is characterized by poor flame resistance. Therefore, to ensure the fire transfer performance of the open fire transfer trough, the damper is basically closed, but the damper is closed. Guan Xiao is not conducive to the combustion efficiency of the stove, and is not conducive to the emission of smoke, which greatly affects the performance of the stove.
  • the technical problem to be solved by the present invention is to provide a burner fire cover for a gas cooker capable of improving the strength of the fire cover fire structure and reducing the probability of the fire escape being blocked.
  • the burner fire cover of the gas cooker comprises an integral annular fire cover body having an annular top wall, an inner ring wall and an outer ring wall, and the inner ring
  • the wall is formed by a vertical or oblique downward extension of an inner edge of the annular top wall, the outer annular wall being formed by an outer edge of the annular top wall extending vertically or obliquely downwardly, the outer ring wall, annular
  • the top wall and the inner ring wall enclose an air mixing chamber; a horizontal fire hole is opened in a radial direction inside the fire cover body, and the fire cover body is further connected with the horizontal fire hole and the air mixing chamber.
  • an outer opening of the lateral fire hole is located on the outer ring wall
  • an inner opening of the horizontal fire hole is located on the inner ring wall
  • the inner ring wall is in a corresponding lateral fire a position of the inner opening of the hole, a boss extending radially toward the center of the fire cover body
  • an angle between a center line of the through hole and a center line of the horizontal fire hole is an acute angle
  • the through hole is from the bottom
  • the end to the top is inclined toward the center of the fire cover body and gradually leans The boss described in the near.
  • the vertical end surface of the boss is A notch is formed in a lower portion corresponding to the inner opening of the lateral ignition hole. The secondary air is supplemented by the notch to the lateral fire hole to improve the air supply in the lateral fire hole and stabilize the combustion in the lateral fire hole to improve the fire transfer performance.
  • the portion of the upper edge of the notch gradually slopes upward along the radial direction of the fire cover body.
  • the lateral fire hole is gradually inclined upward from the inner side opening to the outer side opening thereof.
  • the lateral fire hole with slope design can enhance the suction of the outside air and increase the gas supply speed; on the other hand, the slope design of the lateral fire hole has a fixed flow to the secondary air to ensure the passage of the secondary air.
  • the fire hole of the inner ring fire cover reduces the supply resistance of the secondary air to the inner ring flame, so that the secondary air is supplied more rapidly; at the same time, the overflow entering the lateral fire is prevented from entering. Through hole.
  • the top of the boss is recessed downward to form a groove for guiding the overflow.
  • the groove is gradually inclined downward from top to bottom.
  • the groove In order to guide the discharge flowing from the groove to flow along the inner ring wall of the fire cover body, the groove includes a base integrally connected with the peripheral wall of the inner ring wall and a center diameter from the base toward the fire cover body To the extended free portion, a joint is also provided at the junction of the base and the inner ring wall.
  • the groove is gradually inclined downward from its free portion to its base.
  • a joint of the outer wall of the two sides of the boss and the inner ring wall has an arcuate guide groove connected to the constriction, and the arcuate guide groove includes a first one near the constriction The end and the second end remote from the constriction, the arcuate channel is gradually inclined downward from its first end to its second end.
  • the bottom wall of the boss is adjacent to the inner edge of the fire cover body, and the lowest point of the bottom wall of the boss The position is higher than the highest point of the second end of the arcuate guide groove.
  • the bottom wall of the boss is located at a distance from the inner edge of the fire cover body, which can effectively reduce the fire transfer distance and make the fire transfer faster.
  • the distance d between the bottom wall of the boss and the inner edge of the fire cover body is 0.8 mm ⁇ d ⁇ 1 mm.
  • the spacing between the two can shorten the fire transfer distance of the overall lateral fire hole.
  • the two vertical walls of the boss are recessed inwardly to form a notch, and the notch is used for the secondary air to enter the horizontal fire hole, thereby improving the lateral fire hole.
  • the air supply stabilizes the combustion in the lateral fire hole and improves the fire transfer performance.
  • the angle ⁇ between the center line of the through hole and the center line of the lateral fire hole ranges from 30° ⁇ ⁇ ⁇ 50°. Since the horizontal fire hole is hidden in the fire cover body, on the one hand, the damper can be opened, so that the amount of primary air entering the through hole and the horizontal fire hole is increased and the speed is increased, so that more secondary air can be drawn into the lateral direction.
  • the ignition hole, the gas, the primary air and the secondary air are mixed into a mixed gas, and can directly collide with the top of the boss, thereby improving the mixing uniformity of the gas and the air in the mixed gas, and at the same time reducing the flow rate and improving the flame holding performance. If the angle is too large, the area where the mixture gas collides with the boss is too small. If the angle is too small, the path of the primary air entering the through hole and the lateral fire hole is too long, which is disadvantageous for the second suction. Secondary air.
  • the invention has the advantages that: by the lateral fire hole design hidden in the fire cover body, the horizontal fire hole becomes a hidden fire transfer groove, and the design can open the air door to make the access The amount of primary air in the hole and the horizontal pilot hole increases while the speed becomes larger, so that more secondary air can be drawn into the lateral fire hole (fire transfer groove);
  • the inner ring wall extends radially toward the center of the fire cover body at a peripheral wall corresponding to the inner side of the horizontal fire hole to form a boss, and the angle ⁇ between the center line of the through hole and the center line of the horizontal fire hole is an acute angle, thereby
  • the gas, the primary air and the secondary air are mixed into a mixed gas, and can directly collide with the top of the boss, thereby improving the mixing uniformity of the gas and the air in the mixed gas, and at the same time reducing the flow velocity, improving the flame-retarding performance, and igniting the lateral direction.
  • the flame at the hole plays a good role in stabilizing the flame;
  • the invention can ensure the secondary air supply of the fire transfer trough inside the fire cover, that is, ensure the flame combustion in the fire transfer trough, and can effectively prevent the blockage of the soup water, and at the same time, the applicability to the opening of the damper is enhanced, that is, the damper opening degree
  • the fire transmission performance can also be guaranteed under larger conditions.
  • FIG. 1 is a schematic structural view of a burner fire cover in Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural view of a burner fire cover according to another embodiment of the present invention.
  • Figure 3 is a longitudinal cross-sectional view of Figure 1;
  • Figure 4 is an enlarged schematic view of a portion A in Figure 1;
  • Figure 5 is a schematic structural view of a burner fire cover in Embodiment 2 of the present invention.
  • Figure 6 is a schematic view showing the structure of a burner fire cover in Embodiment 3 of the present invention.
  • the burner fire cover of the gas cooker includes a fire cover body 1 having an overall annular shape.
  • the hood body 1 has an inner ring wall 11, an annular top wall 1a, and an outer ring wall 12 that are sequentially connected.
  • the inner ring wall 11 is formed by the inner side edge 1b of the annular top wall 1a extending vertically or obliquely downward
  • the outer ring wall 12 is formed by the outer side edge 1c of the annular top wall 1a extending vertically or obliquely downward.
  • the outer ring wall 12, the annular top wall 1a, and the inner ring wall 11 enclose an air mixing chamber 13 having an opening facing downward.
  • a horizontal fire hole 14 is opened in the radial direction inside the fire cover body 1.
  • the fire cover body 1 is located at the bottom of the horizontal fire hole 14 and has a through hole 141 communicating with the horizontal fire hole 14 and the lower air mixing chamber 13 therein. ;
  • the outer opening 142 of the horizontal fire hole 14 is located on the outer ring wall 12, and the inner opening 143 of the horizontal fire hole 14 is located on the inner ring wall 11, and the inner ring wall 11 corresponds to the peripheral wall of the inner opening 143 of the horizontal fire hole 14 and faces the fire.
  • the through hole 141 is disposed obliquely from the bottom end 141a of the communication mixing chamber 13 to the top end 141b of the communication lateral fire hole 14 toward the center of the fire cover body 1 (i.e., the inner side of the fire cover body 1) such that the top end of the through hole 141 141b is near the boss 2.
  • the angle ⁇ between the center line L1 of the through hole 141 and the center line L2 of the lateral fire hole 14 is an acute angle, and the angle ⁇ ranges from 30° ⁇ ⁇ ⁇ 50°.
  • the angle of the acute angle ⁇ in this embodiment is preferably 40°.
  • the damper can be opened, so that the amount of primary air entering the through hole 141 and the lateral fire hole 14 is increased while the speed is changed. Larger, so that more secondary air can be drawn into the horizontal fire hole 14, gas, primary air and secondary air mixed into a mixture gas can directly collide with the top of the boss 2, improving the gas and air in the mixture Mixing uniformity while reducing flow rate and improving flame holding performance. If the angle is too large, the area where the mixture gas collides with the boss 2 is too small. If the angle is too small, the path of the primary air entering the through hole 141 and the lateral fire hole 14 is too long, which is disadvantageous. Entrain the secondary air.
  • the boss 2 is vertically
  • the end surface is formed with a notch 21 at a lower portion of the inner opening 143 of the corresponding lateral fire hole 14.
  • the notch 21 is for the secondary air to enter the lateral fire hole 14, and the portion 22 of the upper edge of the notch 21 is gradually inclined upward along the radial direction of the fire cover body 1, which prevents the overflow from entering the lateral fire through the inner opening of the lateral fire hole 14.
  • the hole 14 is filled with the secondary air through the notch 21 to supplement the secondary air to improve the air supply in the lateral fire hole 14, and to stabilize the combustion in the lateral fire hole 14 to improve the fire transfer performance. More preferably, the lateral pilot hole 14 is gradually inclined upward from its inner opening 143 to its outer opening 142.
  • the slope design of the lateral fire hole 14 can enhance the suction effect on the outside air and increase the gas supply speed; on the other hand, the slope design of the lateral fire hole 14 has a guiding flow effect on the secondary air to ensure the flow.
  • the secondary air After the secondary air passes through the air mixing chamber, it just faces the fire hole of the inner ring fire cover, which reduces the supply resistance of the secondary air to the inner ring flame, so that the secondary air is supplied more rapidly; at the same time, it can prevent entering the lateral fire place.
  • the overflow enters the through hole 141.
  • the groove 23 of the liquid in order to guide the discharge flowing from the inside of the groove 23 to flow along the inner ring wall 11 of the hood body 1, the groove 23 includes a base 111 integrally connected to the peripheral wall of the inner ring wall 11 and The base portion 111 is a free portion 112 extending radially toward the center of the hood body 1.
  • the groove 23 is gradually inclined downward from the free portion 112 to the base portion 111 thereof, and the connection between the base portion 111 and the inner ring wall 11 is also provided with a contraction.
  • the port 231, and the connecting portion of the outer wall of the two sides of the boss 2 and the inner ring wall 11 further has an arcuate guiding slot 232 connected to the constricting opening 231, the arcuate guiding slot 232 includes a first end adjacent to the constricting opening 231 2311 and the second end 2312 away from the constriction 231, the curved channel 232 is gradually sloped downward from its first end 2311 to its second end 2312 for better drainage.
  • the primary air and the secondary air are mixed into a mixed gas, they can directly collide with the top of the boss 2, and then turn through the upper edge portion 22 to flow out from the inner opening of the lateral fire hole 14, thereby effectively reducing the mixing.
  • the velocity of the gas flowing out of the lateral igniter 14 causes the gas at the lateral pylon 14 to be less likely to escape from the flame during combustion, thereby making the igniting of the burner more stable.
  • the lowest point of the bottom wall 24 of the boss 2 is higher than the curved guide groove 232.
  • the bottom end of the second end is located at the highest point, and the bottom wall 24 of the boss 2 is adjacent to the inner edge 110 of the fire cover body 1 and has a certain distance d, which ranges from 0.8 mm ⁇ d ⁇ 1 mm.
  • the spacing d The gap is 0.9 mm, and the spacing between the two can shorten the ignition distance of the overall lateral fire hole 14.
  • the vertical end surface of the boss 2 is formed with a notch 21 at the lower portion of the inner opening 143 of the corresponding lateral fire hole 14, and the notch 21
  • the secondary air enters the horizontal fire hole 14, which improves the air supply in the horizontal fire hole 14, stabilizes the combustion in the lateral fire hole 14, and improves the fire transfer performance.
  • the burner fire cover structure of the gas cooker has optimized the structure of the hidden horizontal fire hole 14 and improves the fire transfer performance, and can effectively prevent the horizontal fire hole 14 from being blocked.
  • FIG. 5 it is the second embodiment of the present invention, which is basically the same as the structure of the first embodiment. The only difference is that the vertical end surface of the horizontal fire hole 14 is not at the lower portion of the inner opening 143 of the corresponding horizontal fire hole 14. There is a gap 21.
  • FIG. 6 it is a third embodiment of the present invention, which is basically the same as the structure of the first embodiment, and the only difference is that a strip groove corresponding to the horizontal fire hole 14 is disposed below the horizontal fire hole 14 . 20.
  • the strip groove 20 can further reduce the gas outlet speed and improve the flame holding ability.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

一种燃气灶具的燃烧器火盖，其包括具有混气腔(13)、横向引火孔(14)、通孔(141)的火盖本体(1)，该通孔(141)连通横向引火孔(14)与混气腔(13)，横向引火孔(14)的两端分别位于火盖本体(1)的外环壁(12)、内环壁(11)上，内环壁(11)上延伸出有凸台(2)，通孔(141)的中心线(L1)与横向引火孔(14)的中心线(L2)之间的夹角(α)为锐角。燃气、一次空气和二次空气混合成混合气后能直接与凸台(2)的顶部撞击，提高了混合气中燃气和空气的混合均匀性，同时又降低了流速，提高了稳焰性能，对横向引火孔(14)处的火焰起到很好的稳焰作用。

Description

一种燃气灶具的燃烧器火盖 技术领域
本发明涉及燃气灶具的技术领域，尤其是涉及一种燃气灶具的燃烧器火盖。
背景技术
目前，市场上销售的传统的燃烧器火盖大部分都是一槽铣通，即在火盖本体的顶部铣通有一条引火槽，这种燃烧器火盖由于火盖本体在引火槽处被断开，因而容易造成火盖本体变形，从而影响引火效果。
如中国专利CN202813375U(专利号为ZL201220464214.0)《具有传火装置及熄火保护功能的燃气炉头》，就公开了类似的传火结构。在该燃气炉头的外环喷火圈上设有多个外环喷火孔，且在该外环喷火权上还设有外环传火装置，该外环传火装置是由装设在外环喷火圈内侧壁上的凸台、设在该凸台及外环喷火圈上的外环传火孔和外环传火槽构成，该外环传火孔与外环传火槽相连通，外环传火孔和外环传火槽与一个外环喷火孔相连通，能实现快速传火；
该传火结构的传火槽为开放式，具有传火呈直线型即传火槽裸露在外环火盖表面，这样子的设计有一个好处，就是传火槽内二次空气的补给很充分，开放式传火槽可以保证传火槽内火焰燃烧时二次空气的补给，有利于火焰燃烧和传火，具有传火快速的特点。
但是开放式传火槽却有两个不好之处：第一、开放式传火槽很容易造成传火槽堵塞，即从锅底流下的汤水很容易流入传火槽内，堵塞后影响传火性能，这也是当前传火槽堵塞维修的主要原因；第二、开放式传火槽对灶具风门要求很高，因为风门开大后，一次空气量过多会造成气流速度过大，从而造成燃烧时离焰或者脱火，因此开放式传火槽的结构特点为稳焰特性较差，因此要保证开放式传火槽的传火性能，基本上都是将风门关的很小，但是风门关小不利于灶具的燃烧效率，也不利于烟气的排放，大大影响了灶具的性能。
为此，需要对燃烧器火盖的传火槽作进一步的改进。
发明内容
本发明所要解决的技术问题是提供一种能提高火盖引火结构强度并降低引火处被堵住机率的燃气灶具的燃烧器火盖。
本发明解决上述技术问题所采用的技术方案为：该燃气灶具的燃烧器火盖，包括具有环状顶壁、内环壁、外环壁的整体呈环状的火盖本体，所述内环壁由环状顶壁的内侧 边缘竖直或倾斜向下延伸而形成，所述外环壁由环状顶壁的外侧边缘竖直或倾斜向下延伸而形成，所述外环壁、环状顶壁、内环壁围成一混气腔；在所述火盖本体的内部沿径向开有横向引火孔，并且，火盖本体内还开有连通所述横向引火孔与混气腔的通孔，其特征在于：所述横向引火孔的外侧开口位于所述外环壁上，所述横向引火孔内侧开口位于所述内环壁上，并且所述内环壁上、在对应横向引火孔内侧开口的位置、朝火盖本体的中心沿径向延伸出有凸台；所述通孔的中心线与横向引火孔的中心线之间的夹角为锐角，并且，通孔自其底端至顶端为向火盖本体的中心倾斜设置且逐步靠近所述的凸台。
由于横向引火孔隐藏于火盖本体内能提高引火孔的防堵塞性能，但同时得解决横向引火孔的空气量缩小带来的燃烧不充分的问题，为此，所述凸台竖向端面在对应所述的横向引火孔内侧开口的下部形成有缺口。通过缺口向横向引火孔补充二次空气，以提高横向引火孔内的空气补给，稳定横向引火孔内的燃烧，以提高传火性能。
为了防止溢液通过横向引火孔内侧开口进入横向引火孔，所述缺口上边缘的部分，沿所述火盖本体的径向向外逐渐向上倾斜。
优选地，所述横向引火孔自其内侧开口至其外侧开口逐渐向上倾斜。该横向引火孔带斜度设计能强化对外界空气的抽吸作用，提高了供气速度；另一方面，横向引火孔的斜度设计对二次空气有定向导流作用，确保二次空气通过混气室后正好正对内环火盖的出火孔，减少了二次空气对内环火焰的供给阻力，使二次空气供给得更迅速；同时，还能防止进入横向引火处的溢液进入通孔。
为了导流溢液，所述凸台顶部向下凹陷形成有用于导流溢液的凹槽。
优选地，所述凹槽自上而下逐渐向下倾斜。
为了导引从凹槽内流下的溢液沿着火盖本体的内环壁流出，所述凹槽包括与所述内环壁周壁一体连接的基部和自该基部朝所述火盖本体的中心径向延伸的自由部，所述基部与所述内环壁的连接处还设置有缩口。
进一步地，所述凹槽自其自由部至其基部逐渐向下倾斜。
进一步地，所述凸台的两侧外壁与所述内环壁的连接处具有与所述缩口相接连的弧形导槽，所述弧形导槽包括有靠近所述缩口的第一端和远离所述缩口的第二端，所述弧形导槽自其第一端至其第二端逐渐向下倾斜。
为了防止从弧形导槽流下的溢液经凸台的底壁进入横向引火孔的内侧开口，所述凸台的底壁邻近所述火盖本体的内侧边缘，并且凸台底壁的最低点所在的位置高于所述弧形导槽的第二端最高点所在的位置。同时，凸台的底壁位于所述火盖本体内侧边缘间隔一段距离，能够有效减少了传火距离，使得传火更快速。
优选地，所述凸台的底壁与所述火盖本体内侧边缘之间的间距d为0.8mm≤d≤1mm。两者存在的该间距能缩短整体横向引火孔的传火距离，同时，凸台的两竖向壁向内凹陷形成有缺口，该缺口供二次空气进入横向引火孔，提高了横向引火孔内的空气补给，稳 定横向引火孔内的燃烧，提高传火性能。
优选地，所述通孔的中心线与横向引火孔的中心线的夹角α范围为30°≤α≤50°。由于横向引火孔隐藏于火盖本体内，一方面能将风门开大，使得进入通孔和横向引火孔的一次空气量增大同时速度变大，从而能更多将二次空气卷吸进入横向引火孔，燃气、一次空气和二次空气混合成混合气后能直接与凸台的顶部撞击，提高了混合气中燃气和空气的混合均匀性，同时又降低了流速，提高了稳焰性能。若该角度过大，则容易造成混合气与凸台撞击的面积过小，若该角度过小，则容易造成进入通孔和横向引火孔的一次空气量的路径过长，不利于卷吸二次空气。
与现有技术相比，本发明的优点在于：通过隐藏在火盖本体内的横向引火孔设计，横向引火孔成为一个隐藏式的传火槽，这样的设计能将风门开大，使得进入通孔和横向引火孔的一次空气量增大同时速度变大，从而能更多将二次空气卷吸进入横向引火孔(传火槽)；
同时，内环壁在对应横向引火孔内侧开口的周壁朝火盖本体的中心径向延伸形成有凸台，且通孔的中心线与横向引火孔的中心线的夹角α为锐角，从而使得燃气、一次空气和二次空气混合成混合气后能直接与凸台的顶部撞击，提高了混合气中燃气和空气的混合均匀性，同时又降低了流速，提高了稳焰性能，对横向引火孔处的火焰起到很好的稳焰作用；
本发明既能保证火盖内部传火槽的二次空气补给，即保证传火槽内的火焰燃烧，又能有效防止汤水的堵塞，同时对风门开度的适用性增强，即在风门开度较大的条件下也可以保证传火性能。
附图说明
图1为本发明实施例1中的燃烧器火盖的结构示意图；
图2为本发明实施例1中的燃烧器火盖从另一个角度观察的结构示意图；
图3为图1的纵向剖视图；
图4为图1中A处的放大示意图；
图5为本发明实施例2中的燃烧器火盖的结构示意图；
图6为本发明实施例3中的燃烧器火盖的结构示意图。
具体实施方式
以下结合附图实施例对本发明作进一步详细描述。
实施例1
如图1～4所示，为本发明的最佳实施例，即实施例1。本实施例中燃气灶具的燃烧 器火盖包括有整体呈环状的火盖本体1。
该火盖本体1具有依次相连的内环壁11、环状顶壁1a、外环壁12。其中，内环壁11由环状顶壁1a的内侧边缘1b竖直或倾斜向下延伸而形成，外环壁12由环状顶壁1a的外侧边缘1c竖直或倾斜向下延伸而形成，外环壁12、环状顶壁1a、内环壁11围成一开口朝下的混气腔13。
在火盖本体1的内部沿径向开有横向引火孔14，火盖本体1内、位于横向引火孔14的底部位置、还开有连通横向引火孔14与其下方混气腔13的通孔141；
横向引火孔14的外侧开口142位于外环壁12上，横向引火孔14的内侧开口143位于内环壁11上，并且内环壁11中对应横向引火孔14内侧开口143的周壁处、朝火盖本体1的中心、沿径向延伸而形成有凸台2；
并且，通孔141自连通混气腔13的底端141a至连通横向引火孔14的顶端141b为向火盖本体1的中心(即火盖本体1的内侧)倾斜设置，使得通孔141的顶端141b靠近凸台2。
本申请的重点在于通孔141的中心线L1与横向引火孔14的中心线L2的夹角α为锐角，夹角α的取值范围为30°≤α≤50°。本实施例中锐角α的角度优选为40°。
由于凸台2的顶部为封闭，使得横向引火孔14完全隐藏于火盖本体1内，一方面能将风门开大，使得进入通孔141和横向引火孔14的一次空气量增大同时速度变大，从而能更多将二次空气卷吸进入横向引火孔14，燃气、一次空气和二次空气混合成混合气后能直接与凸台2的顶部撞击，提高了混合气中燃气和空气的混合均匀性，同时又降低了流速，提高了稳焰性能。若该角度过大，则容易造成混合气与凸台2撞击的面积过小，若该角度过小，则容易造成进入通孔141和横向引火孔14的一次空气量的路径过长，不利于卷吸二次空气。
由于横向引火孔14隐藏于火盖本体1内能提高引火孔的防堵塞性能，但同时得解决横向引火孔14的空气量缩小带来的燃烧不充分的问题，为此，凸台2竖向端面在对应横向引火孔14内侧开口143的下部形成有缺口21。该缺口21供二次空气进入横向引火孔14，同时缺口21上边缘的部分22，沿火盖本体1的径向向外逐渐向上倾斜，能防止溢液通过横向引火孔14内侧开口进入横向引火孔14，而通过缺口21向横向引火孔14补充二次空气，以提高横向引火孔14内的空气补给，稳定横向引火孔14内的燃烧，以提高传火性能。更好地，横向引火孔14自其内侧开口143至其外侧开口142逐渐向上倾斜。该横向引火孔14的带斜度设计能强化对外界空气的抽吸作用，提高了供气速度；另一方面，横向引火孔14的带斜度设计对二次空气有定向导流作用，确保二次空气通过混气室后正好正对内环火盖的出火孔，减少了二次空气对内环火焰的供给阻力，使二次空气供给得更迅速；同时，还能防止进入横向引火处的溢液进入通孔141。
另外，由于横向引火孔14隐藏于火盖本体1内能提高引火孔的防堵塞性能，还需 要尽量避免溢液进入横向引火孔14，为此，凸台2顶部向下凹陷形成有用于导流溢液的凹槽23，同时，为了导引从凹槽23内流下的溢液沿着火盖本体1的内环壁11流出，该凹槽23包括与内环壁11周壁一体连接的基部111和自该基部111朝火盖本体1的中心径向延伸的自由部112，凹槽23自其自由部112至其基部111逐渐向下倾斜，且基部111与内环壁11的连接处还设置有缩口231，而凸台2的两侧外壁与内环壁11的连接处还具有与缩口231相接连的弧形导槽232，该弧形导槽232包括有靠近缩口231的第一端2311和远离缩口231的第二端2312，为了更好地导引溢液，弧形导槽232自其第一端2311至其第二端2312逐渐向下倾斜。
另外，燃气、一次空气和二次空气混合成混合气后能直接与凸台2的顶部撞击后，需经过上边缘的部分22转弯后才能从横向引火孔14的内侧开口流出，从而有效降低混合气体从横向引火孔14流出时的气流速度，使横向引火孔14处的气体在燃烧时不容易离焰，进而使燃烧器的引火更加稳定。同时，为了防止从弧形导槽232流下的溢液经凸台2的底壁24进入横向引火孔14的内侧开口，凸台2底壁24的最低点所在的位置高于弧形导槽232的第二端最高点所在的位置，且凸台2的底壁24邻近火盖本体1的内侧边缘110并具有一定间距d，其范围为0.8mm≤d≤1mm，本实施例中，间距d为0.9mm，两者存在的该间距能缩短整体横向引火孔14的传火距离，同时，凸台2竖向端面在对应的横向引火孔14内侧开口143的下部形成有缺口21，该缺口21供二次空气进入横向引火孔14，提高了横向引火孔14内的空气补给，稳定横向引火孔14内的燃烧，提高传火性能。
为此，本燃气灶具的燃烧器火盖结构，对隐藏式横向引火孔14结构进行了优化设计，提高了传火性能的基础上又可以有效防止横向引火孔14堵塞。
实施例2
如图5所示，为本发明的实施例2，其与实施例1的结构基本相同，区别点仅在于：在横向引火孔14的竖向端面在对应横向引火孔14内侧开口143的下部不具有缺口21。
实施例3
如图6所示，为本发明的实施例3，其与实施例1的结构基本相同，区别点仅在于：在横向引火孔14的下方设置有贯穿对应于该横向引火孔14的条形槽20，该条形槽20能进一步降低出气速度，提高稳焰能力。

Claims (11)

  1. 一种燃气灶具的燃烧器火盖，包括具有环状顶壁(1a)、内环壁(11)、外环壁(12)的整体呈环状的火盖本体(1)，所述内环壁(11)由环状顶壁(1a)的内侧边缘(1b)竖直或倾斜向下延伸而形成，所述外环壁(12)由环状顶壁(1a)的外侧边缘(1c)竖直或倾斜向下延伸而形成，所述外环壁(12)、环状顶壁(1a)、内环壁(11)围成一混气腔(13)；
    在所述火盖本体(1)的内部沿径向开有横向引火孔(14)，并且，火盖本体(1)内还开有连通所述横向引火孔(14)与混气腔(13)的通孔(141)，其特征在于：
    所述横向引火孔(14)的外侧开口(142)位于所述外环壁(12)上，所述横向引火孔(14)内侧开口(143)位于所述内环壁(11)上，并且所述内环壁(11)上、在对应横向引火孔(14)内侧开口(143)的位置、朝火盖本体(1)的中心沿径向延伸出有凸台(2)；
    所述通孔(141)的中心线(L1)与横向引火孔(14)的中心线(L2)之间的夹角(α)为锐角，并且，通孔(141)自其底端(141a)至顶端(141b)为向火盖本体(1)的中心倾斜设置且逐步靠近所述的凸台(2)。
  2. 根据权利要求1所述的燃烧器火盖，其特征在于：所述凸台(2)竖向端面在对应所述的横向引火孔(14)内侧开口(143)的下部形成有缺口(21)。
  3. 根据权利要求2所述的燃烧器火盖，其特征在于：所述缺口(21)上边缘的部分(22)，沿所述火盖本体(1)的径向向外逐渐向上倾斜。
  4. 根据权利要求1所述的燃烧器火盖，其特征在于：所述横向引火孔(14)自其内侧开口(143)至其外侧开口(142)逐渐向上倾斜。
  5. 根据权利要求1～4任意一项权利要求所述的燃烧器火盖，其特征在于：所述凸台(2)顶部向下凹陷形成有用于导流溢液的凹槽(23)。
  6. 根据权利要求5所述的燃烧器火盖，其特征在于：所述凹槽(23)包括与所述内环壁(11)周壁一体连接的基部(111)和自该基部(111)朝所述火盖本体(1)的中心径向延伸的自由部(112)，所述基部(111)与所述内环壁(11)的连接处还设置有缩口(231)。
  7. 根据权利要求6所述的燃烧器火盖，其特征在于：所述凹槽(23)自其自由部(112)至其基部(111)逐渐向下倾斜。
  8. 根据权利要求6所述的燃烧器火盖，其特征在于：所述凸台(2)的两侧外壁与所述内环壁(11)的连接处具有与所述缩口(231)相接连的弧形导槽(232)，所述弧形导槽(232)包括有靠近所述缩口(231)的第一端(2311)和远离所述缩口(231)的第二端(2312)，所述弧形导槽(232)自其第一端(2311)至其第二端(2312)逐渐向下倾斜。
  9. 根据权利要求8所述的燃烧器火盖，其特征在于：所述凸台(2)的底壁(24)邻近所述火盖本体(1)的内侧边缘(110)，并且凸台(2)底壁(24)的最低点所在的位置高于所述弧形导槽(232)的第二端最高点所在的位置。
  10. 根据权利要求9所述的燃烧器火盖，其特征在于：所述凸台(2)的底壁(24)与所 述火盖本体(1)内侧边缘(110)之间的间距(d)范围为0.8mm≤d≤1mm。
  11. 根据权利要求6～10任意一项权所述的燃烧器火盖，其特征在于：所述通孔(141)的中心线(L1)与横向引火孔(14)的中心线(L2)之间的夹角(α)的范围为30°≤α≤50°。
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