WO2010105515A1 - 鼓风引射式燃气燃烧器 - Google Patents

鼓风引射式燃气燃烧器 Download PDF

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WO2010105515A1
WO2010105515A1 PCT/CN2010/070368 CN2010070368W WO2010105515A1 WO 2010105515 A1 WO2010105515 A1 WO 2010105515A1 CN 2010070368 W CN2010070368 W CN 2010070368W WO 2010105515 A1 WO2010105515 A1 WO 2010105515A1
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air
gas
injection hole
nozzle
inlet
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French (fr)
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王伟森
闫维新
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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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/08—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with axial outlets at the burner head
    • F23D14/085—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with axial outlets at the burner head with injector axis inclined to the burner head axis
    • 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
    • F23D14/48—Nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14642—Special features of gas burners with jet mixers with more than one gas injection nozzles or orifices for a single mixing tube

Definitions

  • the present invention relates to a gas burner, and more particularly to an air blasting gas burner.
  • FIG. 1 One is an ejector gas burner, see FIG. 1 , which generally includes a fire cover 1 , an ejector tube 2 and a nozzle 3 .
  • the ejector tube 2 is provided with a first air inlet 21 at one end of the nozzle 3 , and the ejector tube 2
  • the first air inlet 21 is connected to the outside atmosphere, and the gas is injected from the nozzle 3 into the ejector tube 2 at a high speed to form a strong ejector in the ejector tube 2, and the outside air is sucked into the ejector tube 2 from the air inlet 21, After being mixed with the gas in the ejector tube 2, it is sent to the fire cover 1 for combustion.
  • the advantages of this burner are: simple and compact structure, good effect of primary air injection, no need for other auxiliary equipment, but its gas supply pressure requirement is higher, generally more than 22.8KPa, that is,
  • the gas is at least medium-pressure gas, which has high sealing requirements for the gas pipeline, and is liable to leak during specific use, and the safety is poor.
  • the other is a blast gas burner, such as the blast gas burner disclosed in Chinese Patent No. 200720080339.2, which has a burner housing with a cavity, the bottom end of which is connected to the blast tube; the cavity of the housing There is a composite plate which divides the cavity of the outer casing into two parts.
  • the cavity above the composite plate is a combustion chamber, and the cavity below the synthetic plate and the bottom end of the outer casing is a mixing chamber;
  • the low-pressure gas can be used to meet the heat load of the burner, thus reducing the sealing requirements of the gas pipeline, preventing leakage, and having high safety performance, but it also has shortcomings: power consumption
  • the noise is large, and since the volume of the blower is generally large, the equipment needs to have a large installation space.
  • the technical problem to be solved by the present invention is to provide a blast-injected gas burner with low gas pressure, high heat load and compact structure.
  • the technical solution of the present invention is:
  • a blasting type gas burner includes a fire cover, an ejector tube and a spray head, and a first air inlet is provided at one end of the ejector tube corresponding to the nozzle, and the ejector tube is open to the atmosphere through the first air inlet, a gas inlet and an air inlet are disposed on the spray head, and the gas inlet and the air inlet are respectively communicated with the ejector through a gas injection hole and an air injection hole, and the air injection hole introduces an air flow introduced by the air inlet Forming a high velocity air stream, Sprayed toward the ejector tube.
  • One of the gas injection holes and one of the air injection holes is evenly distributed outside the other injection hole to form a surrounding shape.
  • the gas injection holes are evenly distributed around the outer side of the air injection holes.
  • the air outlet end of the air injection hole extends out of the air outlet end of the gas injection hole 1-5 Mm, preferably, the outlet end of the air orifice extends 1-3 mm from the outlet end of the gas orifice.
  • the nozzle is provided with a flow guiding tube, and the gas injection hole and the air outlet end of the air injection hole are opposite to the air guiding tube, and the gas introduced by the gas injection hole and the air injection hole enters the injection tube through the air guiding tube.
  • the spray head may be designed as a component body structure including a head holder, a gas joint, and an air joint, the gas inlet being located at one end of the gas joint, the air inlet being located at one end of the air joint, the gas joint and the gas joint The other end of the air joint is connected to the head holder, respectively.
  • one end of the air joint connected to the nozzle seat protrudes into the nozzle holder, and the gas nozzle is enclosed between the air joint and the nozzle holder, and the nozzle seat is provided with a through hole, and the gas inlet passes through the air hole and the gas spray
  • the holes are in communication and the air orifice is located on the end of the air connection away from the air inlet.
  • a second air inlet communicating with the air spray hole is further disposed on the air joint, and the second air inlet is located between the air spray hole and the lead pipe.
  • the gas inlet When the invention is in use, the gas inlet is connected to a low-pressure gas source, such as a civil pipeline gas with a pressure of about 2.8 Kpa, and the air inlet is connected to a high-speed air source, such as an air pump, and the working principle is as follows:
  • a low-pressure gas source such as a civil pipeline gas with a pressure of about 2.8 Kpa
  • a high-speed air source such as an air pump
  • the low-pressure gas input from the gas inlet and the air flow input from the air enter the ejector tube through the air injection hole and the gas injection hole respectively, wherein the air flow having a higher flow velocity is further accelerated when passing through the air injection hole.
  • the high-speed airflow is formed to the ejector tube, and the high-speed airflow forms a negative pressure in the ejector tube. Under the action of the negative pressure, on the one hand, the low-pressure gas is accelerated, the flow rate is increased, and on the other hand, a large amount of air is quickly sucked from the first air inlet. , fill in the secondary air.
  • the high-speed airflow, the accelerated low-pressure gas, and the secondary air are uniformly mixed in the ejector tube to form an oxygen-rich combustible gas mixture having a high flow rate, which is quickly and fully combusted after being output to the fire cover, and has a high heat load.
  • the burner of the present invention ingeniously combines the two, thereby combining the functions of the ejector burner and the blast burner, which utilizes the strong ejector generated by the high-speed airflow.
  • the function is to increase the flow rate of the low-pressure gas on the one hand, and to absorb the secondary air on the other hand to supplement the large amount of oxygen required for combustion, so that the final combustible mixed gas can be quickly and fully burned to meet the heat load requirement.
  • the adjustment of the burner heat load of the present invention can be achieved by controlling the flow rate of the low pressure gas and/or the voltage of the pump.
  • the gas injection hole and the air injection hole of the present invention are integrated on the spray head, and the structure is compact, and at the same time, since the volume of the air pump used in conjunction with the same is small, the combination of the two uses the space.
  • the requirements are relatively low, the installation and use are extremely convenient, and the required gas is low-pressure supply, which is safe and reliable.
  • the gas injection hole and one of the air injection holes are evenly distributed outside the other injection hole, which can ensure the high speed gas flow can reliably accelerate the low pressure gas.
  • the air outlet end of the air injection hole extends out of the air outlet end of the gas injection hole 1-5 Mm, so set, can make the high-speed airflow better speed up the low-pressure gas and introduce the secondary air.
  • the function of the draft tube is to accurately introduce the high-speed airflow input from the nozzle and the low-pressure gas (mainly the high-speed airflow) into the throat of the ejector tube to ensure the ejector effect of the ejector tube.
  • the above-mentioned nozzle is designed to have a component structure, which is convenient for processing.
  • Providing a second air inlet communicating with the air spray hole on the air joint can further increase the input amount of air, and the high-speed air flow flowing out from the air spray hole generates a negative pressure when flowing through the second air inlet, and the external air is The second air inlet is sucked into the nozzle and enters the ejector tube along with the high velocity airflow.
  • the invention has the advantages that it has the advantages of the ejector burner and the blast burner, and the required gas pressure is low, the heat load is high, the structure is compact, and the noise is low.
  • Figure 1 is a schematic view of a conventional ejector gas burner
  • Embodiment 1 of the present invention is a schematic view of Embodiment 1 of the present invention.
  • Figure 3 is a perspective view of the spray head of Figure 1;
  • Figure 4 is a schematic view of Embodiment 2 of the present invention.
  • FIG. 5 is a schematic view of the spray head of Figure 4.
  • Figure 6 is a cross-sectional view taken along line A-A of Figure 5;
  • Figure 7 is a schematic view showing still another structure of the nozzle of the present invention.
  • Figure 8 is a cross-sectional view taken along line B-B of Figure 6.
  • the blast-injecting gas burner of the present invention comprises a fire cover 1, an ejector tube 2, a first air inlet 21, and a showerhead 3.
  • the nozzle 3 is of a unitary structure, and the gas inlet 31 and the air inlet 32 communicate with the ejector tube 2 through the gas injection hole 33 and the air injection hole 34, respectively.
  • the nozzle 3 is provided with a baffle 36 corresponding to the gas outlet end of the gas injection hole 33, and the baffle 36 is provided with a through hole 361 (six shown in FIG. 3) for making gas.
  • the low-pressure gas flowing out of the injection hole 33 is divided into a plurality of injection jets into the ejector tube 2.
  • the high-speed airflow injected from the air injection hole 34 can better speed up the low-pressure gas, and also facilitate better mixing of the two. .
  • a spray tube 35 is connected to the spray head 3, and the gas introduced by the gas injection hole 33 and the air injection hole 34 enters the discharge tube 2 via the guide tube 35.
  • the nozzle 3 is of a split structure, and the nozzle 3 includes a nozzle holder 301, a gas joint 302 and an air joint 303.
  • One end of the air joint 303 extends into the nozzle holder 301 to enclose a gas injection hole 33 therebetween;
  • the air inlet 32 is located At the left end of the air joint 303, the air injection hole 34 is located at the right end of the air joint 303 and extends into the ejector tube 2;
  • the gas inlet 31 is located at the lower end of the gas joint 302, and the nozzle seat 301 is provided with a venting hole 3011 through which the gas inlet 31 passes.
  • the through hole 3011 is in communication with the gas injection hole 33.
  • the air outlet end of the air injection hole 34 extends from the gas injection hole 33 and has an extension length of 2 mm.
  • the axis of the air injection hole 34 coincides with the axis of the ejector tube 2, and the gas injection hole 33 surrounds the outer side of the air injection hole 34.
  • Embodiment 7 differs from Embodiment 2 in that the air joint 303 is:
  • the air connector 303 is provided with a second air inlet 3031 communicating with the air nozzle hole 34, and the second air inlet 3031 is located between the air nozzle hole 34 and the ejector tube 2.
  • the second air inlet 3031 communicates with the air injection hole 34 through a plurality of vent holes 3032 disposed radially along the air joint 303.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nozzles For Spraying Of Liquid Fuel (AREA)
  • Gas Burners (AREA)
  • Nozzles (AREA)

Description

鼓风引射式燃气燃烧器 技术领域
本发明涉及一种燃气燃烧器，尤其涉及一种鼓风引射式燃气燃烧器。
背景技术
目前，用于商用厨具上的燃气燃烧器主要有两种，其中：
一种是引射式燃气燃烧器，参见图1，其一般包括火盖1、引射管2及喷头3，引射管2对应喷头3的一端设置有第一进风口21，引射管2通过第一进风口21与外界大气相通，燃气从喷头3高速喷入到引射管2内，在引射管2内形成强引射，外界空气从空气入口21吸入到引射管2内，在与引射管2内的燃气混合后，送至火盖1，以供燃烧所需。这种燃烧器的优点是：结构简单、紧凑，一次空气引射的效果好，无需其它附属设备配套使用，但是，其对燃气的供气压力要求较高，一般要求大于22.8KPa，即所供燃气至少为中压燃气，这对于燃气管路的密封性要求较高，在具体使用时易发生泄露，安全性差。
另一种是鼓风式燃气燃烧器，如在中国专利200720080339.2中公开的鼓风式燃气燃烧器，其内设有空腔的燃烧器外壳，外壳底端与鼓风管连接；外壳的空腔中设有一合成板，合成板将外壳空腔分为两部分，位于合成板上方的空腔为燃烧室，位于合成板下方、外壳底端之间的空腔为混合室；在混合室中设有与燃气管连接的、其上开有数个气孔的喷嘴。由于鼓风机送风量大且风速高，使用低压燃气即可满足燃烧器的热负荷，因此降低了对燃气管路的密封要求，不易发生泄露，安全性能较高，但其也存在不足：耗电、噪音大，且由于鼓风机的体积一般较大，设备需要有较大的安装空间。
 技术问题
本发明所要解决的技术问题是提供一种燃气压力低、热负荷高及结构紧凑的鼓风引射式燃气燃烧器。
 技术解决方案
为解决上述技术问题，本发明的技术方案为：
一种鼓风引射式燃气燃烧器，包括火盖、引射管及喷头，引射管对应喷头的一端设置有第一进风口，引射管通过第一进风口与外界大气相通，所述喷头上设置有燃气入口和空气入口，所述燃气入口和空气入口分别通过燃气喷孔、空气喷孔与所述引射管相连通,所述空气喷孔使所述空气入口所引入的空气流形成高速气流, 喷向所述引射管。
上述燃气喷孔与上述空气喷孔其中之一喷孔均匀分布在另一喷孔外侧，形成包围状。优选地，燃气喷孔均匀分布在空气喷孔的外侧四周。
可供选择地，燃气喷孔均匀分布在空气喷孔的外侧四周时，空气喷孔的出气端伸出燃气喷孔的出气端1-5 mm，优选地，空气喷孔的出气端伸出所述燃气喷孔的出气端1-3 mm。
具体地，上述喷头上设置有导流管，上述燃气喷孔、上述空气喷孔的出气端与导流管相对，燃气喷孔与空气喷孔所引入的气体经导流管进入引射管。
上述喷头可设计成分体式结构，其包括喷头座、燃气接头以及空气接头，所述燃气入口位于所述燃气接头的一端，所述空气入口位于所述空气接头的一端，所述燃气接头与所述空气接头的另一端分别与所述喷头座相连。
具体地，上述空气接头与上述喷头座相连的一端伸入喷头座内，空气接头与喷头座之间围成所述燃气喷孔，喷头座上设置有过气孔，燃气入口通过过气孔与燃气喷孔相连通，空气喷孔位于空气接头远离所述空气入口的一端上。
在上述空气接头上还设置有与空气喷孔连通的第二进风口，第二进风口位于空气喷孔与所述引射管之间。
 有益效果
本发明在使用时，燃气入口接低压燃气源，如接压力为2.8Kpa左右的民用管道燃气，空气入口接高速空气源，如接打气泵，其工作原理如下：
由燃气入口输入的低压燃气及由空气入输入的空气流分别经空气喷孔、燃气喷孔同时进入引射管，其中，具有较高流速的空气流在经过空气喷孔时，被进一步加速，形成高速气流喷向引射管，高速气流在引射管内形成负压，在负压的作用下，一方面，低压燃气被加速，流速提高，另一方面，大量空气从第一空气进口快速吸入，补入二次空气。高速气流、被加速的低压燃气以及二次空气在引射管内均匀混合，形成具有较高流速的、富含氧气的可燃混合气体，其输出到火盖后快速充分燃烧，热负荷高。
通常情况下，低压燃气因其流速过小，热负荷较低，往往达不到用户的要求；而打气泵，虽然可以保证输入空气（或最终的可燃混合气体）的流速，但由于其较鼓风机来说，输入的空气量有限，无法提供富氧使燃气充分燃烧，同样不能满足用户的要求。
从上述技术方案可以看出，本发明的燃烧器巧妙的将二者结合在一起，从而兼具了引射式燃烧器及鼓风式燃烧器的功能，其利用高速气流所产生的强引射作用，一方面提高了低压燃气的流速，另一方面能过吸入二次空气，补充燃烧所需要的大量的氧，从而使最终的可燃混合气体能够快速充分燃烧，满足热负荷的要求。
本发明的燃烧器热负荷的调节，可通过控制低压燃气的流量和/或打气泵的电压等方式来实现。
从上述技术方案中不难看出，本发明的燃气喷孔与空气喷孔集成在喷头上，结构紧凑，同时，由于与其配合使用的打气泵的体积也很小，二者组合使用后，对空间要求相对较低，安装及使用极为方便，加之所需的燃气为低压供给，使用安全可靠。
上述燃气喷孔与上述空气喷孔其中之一喷孔均匀分布在另一喷孔外侧，可保证高速气流对低压燃气进行可靠的提速。
燃气喷孔均匀分布在空气喷孔的外侧四周时，空气喷孔的出气端伸出燃气喷孔的出气端1-5 mm，如此设置，可使高速气流更好的对低压燃气进行提速和进行二次空气的引入。
导流管所起的作用是，将从喷头输入的高速气流及低压燃气（主要是高速气流）准确的导入引射管的喉部，保证引射管的引射效果。
上述喷头设计成分体式结构， 可方便加工。
在上述空气接头上设置与空气喷孔连通的第二进风口，可进一步增加空气的输入量，从空气喷孔流出的高速气流在流经第二进风口时，产生负压作用，外部空气由第二进风口吸入喷头，随高速气流一起进入引射管。
与现有技术相比，本发明的有益效果是：兼有引射式燃烧器及鼓风式燃烧器的优点，所需燃气压力低、热负荷高、结构紧凑、噪音低。
以下结合附图和实施例，来进一步说明本发明。但本发明并不局限于这些实施例，任何在本实施例基本精神上的改进或替代，仍属于本发明权利要求所要求保护的范围。
 附图说明
图1为现有的引射式燃气燃烧器的示意图；
图2为本发明实施例1的示意图；
图3为图1中喷头的立体图；
图4为本发明实施例2的示意图；
图5为图4中喷头的示意图；
图6为图5 中A-A的剖视图；
图7为本发明的喷头的又一结构示意图；
图8为图6中 B-B的剖视图。
 本发明的实施方式
实施例1
如图2所示，本发明的鼓风引射式燃气燃烧器，包括火盖1、引射管2、第一进风口21及喷头3。
参见图2，喷头3为一体式结构，燃气入口31与空气入口32分别通过燃气喷孔33、空气喷孔34与引射管2相连通。
从图2、图3中还可以看出，喷头3对应燃气喷孔33的出气端设置有一挡板36，挡板36上设置有过气孔361（图3所示为6个），其使燃气喷孔33流出的低压燃气分成多束喷入引射管2内，此时，由空气喷孔34喷入的高速气流可更好的对低压燃气进行提速，同时也利于二者更好的混合。
参见图2，喷头3上连接有导流管35，燃气喷孔33与空气喷孔34所引入的气体经导流管35进入引射管2。
实施例2
如图4所示，作为本发明的另一种实施例，其与实施例1相比，除没有导流管35外，不同之处还在于：
喷头3为分体式结构，喷头3包括喷头座301、燃气接头302以及空气接头303，空气接头303的一端伸入喷头座301内，在二者之间围出燃气喷孔33；空气入口32位于空气接头303的左端，空气喷孔34位于空气接头303的右端，伸入到引射管2内；燃气入口31位于燃气接头302的下端，喷头座301上设有过气孔3011，燃气入口31通过该过气孔3011与燃气喷孔33相连通。
从图4及图5中可以看出，空气喷孔34的出气端从燃气喷孔33中伸出，其伸出长度为2 mm。
从图6中可以看出，空气喷孔34的轴线与引射管2的轴线重合，燃气喷孔33环绕在空气喷孔34的外侧四周。
实施例3
结合图7，作为本发明的又一种实施例，其与实施例2相比，不同之处在于空气接头303：
空气接头303上设置有与空气喷孔34连通的第二进风口3031，第二进风口3031位于空气喷孔34与引射管2之间。
参见图6，第二进风口3031通过多个沿空气接头303径向设置的通气孔3032与空气喷孔34连通。

Claims (7)

  1. 一种鼓风引射式燃气燃烧器，包括火盖（1）、引射管（2）及喷头（3），引射管（2）对应喷头（3）的一端设置有第一进风口（21），引射管（2）通过第一进风口（21）与外界大气相通，其特征在于：所述喷头（3）上设置有燃气入口（31）和空气入口（32），所述燃气入口（31）和空气入口（32）分别通过燃气喷孔（33）、空气喷孔（34）与所述引射管（2）相连通,所述空气喷孔（34）使所述空气入口（32）所引入的空气流形成高速气流, 喷向所述引射管（2）。
  2. 如权利要求1所述的鼓风引射式燃气燃烧器，其特征在于：所述燃气喷孔（33）均匀分布在所述空气喷孔（34）的外侧四周。
  3. 如权利要求2所述的鼓风引射式燃气燃烧器，其特征在于：所述空气喷孔（34）的出气端伸出所述燃气喷孔（33）的出气端1-5 mm。
  4. 如权利要求1所述的鼓风引射式燃气燃烧器，其特征在于：所述喷头（3）上设置有导流管（35），所述燃气喷孔（33）、所述空气喷孔（34）的出气端与所述导流管（35）相对，所述燃气喷孔（33）与所述空气喷孔（34）所引入的气体经所述导流管（35）进入所述引射管（2）。
  5. 如权利要求1所述的鼓风引射式燃气燃烧器，其特征在于：所述喷头（3）包括喷头座（301）、燃气接头（302）以及空气接头（303），所述燃气入口（31）位于所述燃气接头（302）的一端，所述空气入口（32）位于所述空气接头（302）的一端，所述燃气接头（302）与所述空气接头（303）的另一端分别与所述喷头座（301）相连。
  6. 如权利要求4所述的鼓风引射式燃气燃烧器，其特征在于：所述空气接头（303）与所述喷头座（301）相连的一端伸入所述喷头座（301）内，所述空气接头（303）与所述喷头座（301）之间围成所述燃气喷孔（33），所述喷头座（301）上设置有过气孔（3011），所述燃气入口（31）通过所述过气孔（3011）与所述燃气喷孔（33）相连通，所述空气喷孔（34）位于所述空气接头（303）远离所述空气入口（32）的一端上。
  7. 如权利要求5所述的鼓风引射式燃气燃烧器，其特征在于：所述空气接头（303）上还设置有与所述空气喷孔（34）连通的第二进风口（3031），所述第二进风口（3031）位于所述空气喷孔（34）与所述引射管（2）之间。
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