An ultra-low nitrogen oxide combustion device

Abstract

The present invention discloses an ultra-low nitrogen oxide combustion device, which relates to the technical field of combustion equipment. The ultra-low nitrogen oxide combustion device includes a central air duct, an outer ring air duct and a first driver. The outer ring air duct is coaxially rotatably sleeved on the outside of the central air duct. The central air duct is provided with a central connecting piece, and the central connecting piece is used to be rotatably connected to a fixed frame. The outer ring air duct is provided with an outer ring connecting piece, and the outer ring connecting piece is used to be connected to a fixed frame. The first driver can drive the central air duct to rotate, which can improve the efficiency of the combustion chamber and reduce the emission of nitrogen oxides.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion equipment, in particular to an ultra-low nitrogen oxide combustion device. Background Art

[0002] With the development of energy-saving and environmental protection technologies, especially with the in-depth treatment of atmospheric pollution, the awareness of the environmental pollution caused by nitrogen oxides is increasing, and the emission requirements of nitrogen oxides for various burners are becoming increasingly stringent. In this case, the combustion of gas burners has also been upgraded from simply requiring combustion efficiency and combustion speed to combustion efficiency and combustion speed under low nitrogen and environmental protection. Existing burners generally mix air and gas before sending them to the combustion chamber for ignition. However, the mixing of air and gas is often insufficient due to reasons such as flow direction or mixing time. This not only wastes gas, but also the ratio of air and gas in the mixed gas of premixed burners is difficult to control. External factors such as furnace back pressure, chimney resistance, and draft can also affect combustion, resulting in incomplete combustion and increased nitrogen oxide emissions.

[0003] However, as the types of gas and gas components change, the swirl structure formed by the swirl plates and other structures on the combustion equipment cannot fully burn the gas, affecting the efficiency of the combustion chamber and the reduction of nitrogen oxide emissions. Summary of the Invention

[0004] The purpose of the present invention is to provide an ultra-low nitrogen oxide combustion device to solve the problems existing in the above-mentioned prior art, thereby improving the efficiency of the combustion chamber and reducing the emission of nitrogen oxides.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides an ultra-low nitrogen oxide combustion device, comprising a central air duct, an outer ring air duct and a first driver. The outer ring air duct is coaxially rotatably sleeved on the outside of the central air duct. The central air duct is provided with a central connecting piece, and the central connecting piece is used to be rotatably connected to a fixed frame. The outer ring air duct is provided with an outer ring connecting piece, and the outer ring connecting piece is used to be connected to a fixed frame. The first driver can drive the central air duct to rotate.

[0007] Preferably, a second driver is further included, the outer ring connector is used to be connected to the fixing frame, and the second driver can drive the outer ring airway to rotate.

[0008] Preferably, the central air duct includes a central jet portion and a central premixing portion. The central premixing portion includes a coaxially arranged central gas chamber, a central premixing chamber, and a central air chamber. The central premixing chamber is located between the central gas chamber and the central air chamber. A plurality of central gas holes are evenly distributed on the wall separating the central gas chamber and the central premixing chamber. The plurality of central gas holes are used for the gas in the central gas chamber to enter the central premixing chamber. A plurality of central air holes are evenly distributed on the wall separating the central air chamber and the central premixing chamber. The plurality of central air holes are used for the air in the central air chamber to enter the central premixing chamber. The central premixing chamber is connected to the central jet portion.

[0009] Preferably, the central jet portion includes a central mixing chamber, a central collecting chamber and a central gas dispersion component. The central mixing chamber is connected to the central collecting chamber. The central gas dispersion component is arranged in the central mixing chamber. The central gas dispersion component is mesh-shaped. A central air outlet is arranged on one end of the central collecting chamber away from the central mixing chamber. The central mixing chamber is connected to the central premixing chamber.

[0010] Preferably, the outer ring air duct includes an outer ring jet section and an outer ring premixing section, the outer ring premixing section includes a coaxially arranged outer ring gas chamber, an outer ring premixing chamber and an outer ring air chamber, the outer ring premixing chamber is located between the outer ring gas chamber and the outer ring air chamber, a plurality of outer ring gas holes are evenly distributed on the partition wall between the outer ring gas chamber and the outer ring premixing chamber, a plurality of outer ring gas holes are evenly distributed on the partition wall between the outer ring air chamber and the outer ring premixing chamber, a plurality of outer ring air holes are evenly distributed on the partition wall between the outer ring air chamber and the outer ring premixing chamber, a plurality of outer ring air holes are used for the air in the outer ring air chamber to enter the outer ring premixing chamber, and the outer ring premixing chamber is communicated with the outer ring jet section.

[0011] Preferably, the outer ring jet portion includes an outer ring mixing chamber, an outer ring collecting chamber and an outer ring gas dispersion component. The outer ring mixing chamber is connected to the outer ring collecting chamber. The outer ring gas dispersion component is arranged in the outer ring mixing chamber. The outer ring gas dispersion component is mesh-shaped. An outer ring air outlet is arranged on the end of the outer ring collecting chamber away from the outer ring mixing chamber. The outer ring mixing chamber is connected to the outer ring premixing chamber.

[0012] Preferably, the central gas dispersion assembly and the outer ring gas dispersion assembly are both PU foam blocks with added flame retardant.

[0013] Preferably, it also includes a central gas channel, a central air channel, an outer ring gas channel and an outer ring air channel coaxially sleeved from the inside to the outside, the central gas channel is connected to the central gas cavity, the central air channel is connected to the central air cavity, the outer ring gas channel is connected to the outer ring gas cavity, the outer ring air channel is connected to the outer ring air cavity, a central ring tooth is fixedly provided on the outer side surface of the central air channel, the output end of the first driver is engaged with the central ring tooth, the first driver can perform forward transmission, flipping and locking, an outer ring tooth is fixedly provided on the outer side surface of the outer ring air channel, the output end of the second driver is engaged with the outer ring tooth, the second driver can perform forward transmission, flipping and locking.

[0014] Preferably, it also includes a fixing frame, the central connecting member is a central bearing, the outer ring connecting member is an outer ring bearing, the inner ring of the central bearing is sleeved on the outer side of the central air channel outside the outer ring gas channel, the outer ring of the central bearing is embedded in the fixing frame, the inner ring of the outer ring bearing is sleeved on the outer side of the outer ring air channel, and the outer ring of the outer ring bearing is embedded in the fixing frame.

[0015] Preferably, a plurality of air holes are evenly distributed on the partition wall between the central mixing chamber and the central collecting chamber, and the plurality of air holes are connected to the central mixing chamber and the central collecting chamber, and the central premixing chamber is connected to the edge of the central mixing chamber. The apertures of the air holes radially arranged along the partition wall gradually increase, and the diameter of the air holes located at the center of the partition wall is larger than the diameter of the air holes located around the partition wall.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The present invention provides an ultra-low nitrogen oxide combustion device, which adopts a central air duct to rotate under the drive of a first driver. After the central mixed gas is ejected, it can further be self-mixed under the action of the centrifugal force of the rotation of the central air duct, so that the gas can be fully burned and the emission of nitrogen oxides is reduced. When the type of gas changes, the combustion of the central mixed gas cannot meet the requirements of the combustion process. The staff can make judgments based on the measurement results of the exhaust emissions, the flame combustion state, etc., and adjust the rotation speed of the central air duct to make the central mixed gas reach the optimal mixing state to meet the requirements of the combustion process, thereby improving the efficiency of the combustion chamber and reducing the emission of nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 An axial view of the ultra-low nitrogen oxide combustion device provided by the present invention;

[0020] Figure 2 for Figure 1 Cross-section of the middle AA;

[0021] Figure 3 This is a schematic structural diagram of the baffle plate in the ultra-low nitrogen oxide combustion device provided by the present invention;

[0022] In the figure: 10-center air channel, 20-outer ring air channel, 30-center connecting piece, 40-outer ring connecting piece, 50-fixing frame,

[0023] 110-Central premixing section, 120-Central jet section, 130-Central ring gear, 111-Central gas chamber, 112-Central premixing chamber, 113-Central air chamber, 114-Central gas channel, 115-Central air channel, 121-Central mixing chamber, 122-Central collecting chamber, 123-Central gas dispersion assembly, 124-Baffle wall, 125-Ventilation hole,

[0024] 210-outer ring premixing section, 220-outer ring jet section, 230-outer ring gear, 211-outer ring gas chamber, 212-outer ring premixing chamber, 213-outer ring air chamber, 214-outer ring gas channel, 215-outer ring air channel, 221-outer ring mixing chamber, 222-outer ring collecting chamber, 223-outer ring gas dispersion assembly. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide an ultra-low nitrogen oxide combustion device to solve the problems existing in the above-mentioned prior art, thereby improving the efficiency of the combustion chamber and reducing the emission of nitrogen oxides.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The present invention provides an ultra-low nitrogen oxide combustion device, such as Figures 1 to 3 As shown, the ultra-low nitrogen oxide combustion device includes a central air duct 10, an outer ring air duct 20 and a first driver. The outer ring air duct 20 is coaxially rotatably sleeved on the outside of the central air duct 10. A central connecting member 30 is provided on the central air duct 10, and the central connecting member 30 is used to be rotatably connected to the fixed frame 50. An outer ring connecting member 40 is provided on the outer ring air duct 20, and the outer ring connecting member 40 is used to be connected to the fixed frame 50 (including multiple connection technical solutions such as the outer ring connecting member 40 being used to be fixedly connected and rotatably connected to the fixed frame 50). The first driver can drive the central air duct 10 to rotate.

[0029] During specific implementation, the gas delivery pipeline and the air delivery pipeline input gas and air into one end of the central air channel 10 to mix to form a central mixed gas, the amount of gas in the central mixed gas is much greater than the amount of air, and the central mixed gas is ejected from the other end of the central air channel 10; the gas delivery pipeline and the air delivery pipeline input gas and air into one end of the outer ring air channel 20 to mix to form an outer ring mixed gas, the amount of air in the outer ring mixed gas is much greater than the amount of gas (the outer ring air channel 20 can also be introduced into the primary gas and air for mixing), the outer ring mixed gas is ejected from the other end of the outer ring air channel 20, and the central air channel 10 rotates under the drive of the first driver. After the central mixed gas is ejected, it can be further self-mixed under the action of the centrifugal force of the rotation of the central gas channel, so that the gas can be fully burned and the emission of nitrogen oxides can be reduced. When the type of gas changes, the combustion of the central mixed gas cannot meet the requirements of the combustion process. The staff can make judgments based on the measurement results of the exhaust emissions, the flame combustion state, etc., and adjust the rotation speed of the central gas channel 10 to make the central mixed gas reach the best mixing state to meet the requirements of the combustion process, thereby improving the efficiency of the combustion chamber and reducing the emission of nitrogen oxides.

[0030] For further details, see Figures 1-2 The ultra-low nitrogen oxide combustion device also includes a second driver. The outer ring connector 40 is used to be rotatably connected to the fixed frame 50. The second driver can drive the outer ring air duct 20 to rotate. The staff can make judgments based on the measurement results of exhaust emissions, flame combustion status, etc., and adjust the rotation speed of the outer ring air duct 20 to make the outer ring mixed gas reach the optimal mixing state to meet the requirements of the combustion process, thereby further improving the efficiency of the combustion chamber and reducing the emission of nitrogen oxides.

[0031] Specifically, the first driver and the second driver may be stepping rotary motors or the like.

[0032] For further details, see Figures 1-2 The central air duct 10 includes a central air injection portion 120 and a central premixing portion 110. The central premixing portion 110 includes a coaxially arranged central gas chamber 111, a central premixing chamber 112, and a central air chamber 113. The central premixing chamber 112 is located between the central gas chamber 111 and the central air chamber 113. A plurality of central gas holes are evenly distributed on the wall separating the central gas chamber 111 and the central premixing chamber 112. The plurality of central gas holes are used to allow the gas in the central gas chamber 111 to enter the central premixing chamber 112. A plurality of central air holes are evenly distributed on the wall separating the central air chamber 113 and the central premixing chamber 112. The plurality of central air holes are used to allow the air in the central air chamber 113 to enter the central premixing chamber 112. The central premixing chamber 112 is connected to the central air injection portion 120.

[0033] During the specific implementation process, the gas in the central gas chamber 111 enters the central premixing chamber 112 through the central gas hole, and the air in the central air chamber 113 enters the central premixing chamber 112 through the central air hole. The gas and air form a counteraction, thereby improving the mixing effect of the gas and air, further improving the combustion effect and reducing the emission of nitrogen oxides.

[0034] For further details, see Figures 1-2 The central jet section 120 includes a central mixing chamber 121, a central collecting chamber 122 and a central gas dispersion component 123. The central mixing chamber 121 and the central collecting chamber 122 are connected. The central gas dispersion component 123 is arranged in the central mixing chamber 121. The central gas dispersion component 123 is mesh-shaped. A central air outlet is arranged on the end of the central collecting chamber 122 away from the central mixing chamber 121. The central air outlet can be a blade-shaped opening or a nozzle, etc. The central mixing chamber 121 is connected to the central premixing chamber 112.

[0035] During the specific implementation process: the central mixed gas coming out of the central premixing chamber 112 enters the central mixing chamber 121. Since the central gas dispersion component 123 is mesh-shaped, the central mixed gas is repeatedly dispersed and remixed in the central gas dispersion component 123, which can further improve the mixing effect.

[0036] For further details, see Figures 1-2The outer ring air duct 20 includes an outer ring jet section 220 and an outer ring premixing section 210. The outer ring premixing section 210 includes a coaxially arranged outer ring gas chamber 211, an outer ring premixing chamber 212 and an outer ring air chamber 213. The outer ring premixing chamber 212 is located between the outer ring gas chamber 211 and the outer ring air chamber 213. A plurality of outer ring gas holes are evenly distributed on the wall separating the outer ring gas chamber 211 and the outer ring premixing chamber 212. The plurality of outer ring gas holes are used for the gas in the outer ring gas chamber 211 to enter the outer ring premixing chamber 212. A plurality of outer ring air holes are evenly distributed on the wall separating the outer ring air chamber 213 and the outer ring premixing chamber 212. The plurality of outer ring air holes are used for the air in the outer ring air chamber 213 to enter the outer ring premixing chamber 212. The outer ring premixing chamber 212 is communicated with the outer ring jet section 220.

[0037] During the specific implementation process: the gas in the outer ring gas chamber 211 enters the outer ring premixing chamber 212 through the outer ring gas hole, and the air in the outer ring air chamber 213 enters the outer ring premixing chamber 212 through the outer ring air hole. The gas and air form a counteraction, thereby improving the mixing effect of the gas and air, further improving the combustion effect and reducing the emission of nitrogen oxides.

[0038] For further details, see Figures 1-2 The outer ring jet section 220 includes an outer ring mixing chamber 221, an outer ring collecting chamber 222 and an outer ring gas dispersion component 223. The outer ring mixing chamber 221 and the outer ring collecting chamber 222 are connected. The outer ring gas dispersion component 223 is arranged in the outer ring mixing chamber 221. The outer ring gas dispersion component 223 is mesh-shaped. An outer ring air outlet is arranged on the end of the outer ring collecting chamber 222 away from the outer ring mixing chamber 221. The outer ring air outlet is a blade-shaped opening or nozzle, etc. The outer ring mixing chamber 221 is connected to the outer ring premixing chamber 212.

[0039] Specifically, the central gas dispersion assembly 123 and the outer ring gas dispersion assembly 223 are both PU foam blocks with added flame retardants. The PU foam blocks with added flame retardants have dense and intricate channels, which can not only improve the mixing effect of gas and air, but also prevent backfire.

[0040] For further details, see Figures 1-2The ultra-low nitrogen oxide combustion device also includes a central gas channel 114, a central air channel 115, an outer ring gas channel 214 and an outer ring air channel 215 which are coaxially sleeved from the inside to the outside. The central gas channel 114 is connected to the central gas cavity 111, the central air channel 115 is connected to the central air cavity 113, the outer ring gas channel 214 is connected to the outer ring gas cavity 211, and the outer ring air channel 215 is connected to the outer ring air cavity 213. A central ring gear 130 is fixedly provided on the outer surface of the central air channel 115, and the output end of the first driver is engaged with the central ring gear 130. The first driver can perform forward transmission, flipping and locking. An outer ring gear 230 is fixedly provided on the outer surface of the outer ring air channel 215, and the output end of the second driver is engaged with the outer ring gear 230. The second driver can perform forward transmission, flipping and locking.

[0041] It is worth noting that the input ends of the central gas channel 114, the central air channel 115, the outer ring gas channel 214 and the outer ring air channel 215 can be connected to their corresponding gas supply pipes through a rotating structure. The first driver and the second driver can both achieve forward, reverse and locking, which can improve a variety of rotation matching schemes and improve the applicability of the ultra-low nitrogen oxide combustion device.

[0042] For further details, see Figures 1-2 The ultra-low nitrogen oxide combustion device also includes a fixed frame 50, the central connecting member 30 is a central bearing, the outer ring connecting member 40 is an outer ring bearing, the inner ring of the central bearing is sleeved on the central air channel 115 and is located on the outer side of the outer ring gas channel 214, the outer ring of the central bearing is embedded in the fixed frame 50, the inner ring of the outer ring bearing is sleeved on the outer side of the outer ring air channel 215, and the outer ring of the outer ring bearing is embedded in the fixed frame 50.

[0043] For further details, see Figure 3 A plurality of vent holes 125 are evenly distributed on the partition wall 124 between the central mixing chamber 121 and the central collecting chamber 122. The plurality of vent holes 125 are connected to the central mixing chamber 121 and the central collecting chamber 122. The central premixing chamber 112 is connected to the edge of the central mixing chamber 121. The apertures of the vent holes 125 radially arranged along the partition wall 124 gradually increase. The diameter of the vent holes 125 located at the center of the partition wall 124 is larger than the diameter of the vent holes 125 located around the partition wall 124, which can improve the uniformity of the central mixed gas entering the central collecting chamber 122 from the central mixing chamber 121.

[0044] In summary, the above embodiment provides an ultra-low nitrogen oxide combustion device, which uses the central air duct 10 to rotate under the drive of the first driver. After the central mixed gas is ejected, it can be further self-mixed under the action of the centrifugal force of the rotation of the central air duct 10, so that the gas can be fully burned and the emission of nitrogen oxides can be reduced. When the type of gas changes, the combustion of the central mixed gas cannot meet the requirements of the combustion process. The staff can make judgments based on the measurement results of the exhaust emissions, the flame combustion state, etc., and adjust the rotation speed of the central air duct 10 to make the central mixed gas reach the optimal mixing state to meet the requirements of the combustion process, thereby improving the efficiency of the combustion chamber and reducing the emission of nitrogen oxides.

[0045] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An ultra-low nitrogen oxide combustion device, characterized in that: include: A central airway, an outer ring airway, and a first driver, wherein the outer ring airway is coaxially rotatably sleeved on the outside of the central airway, the central airway is provided with a central connector, the central connector is used to be rotatably connected to a fixed frame, the outer ring airway is provided with an outer ring connector, the outer ring connector is used to be connected to a fixed frame, and the first driver can drive the central airway to rotate; The central air passage includes a central air injection portion and a central premixing portion. The central premixing portion includes a coaxially arranged central gas chamber, a central premixing chamber, and a central air chamber. The central premixing chamber is located between the central gas chamber and the central air chamber. A plurality of central gas holes are uniformly distributed on the wall separating the central gas chamber and the central premixing chamber. The plurality of central gas holes are used for the gas in the central gas chamber to enter the central premixing chamber. A plurality of central air holes are uniformly distributed on the wall separating the central air chamber and the central premixing chamber. The plurality of central air holes are used for the air in the central air chamber to enter the central premixing chamber. The central premixing chamber is in communication with the central air injection portion. The outer ring air passage comprises an outer ring jet portion and an outer ring premixing portion, wherein the outer ring premixing portion comprises an outer ring gas cavity, an outer ring premixing cavity and an outer ring air cavity which are coaxially arranged; The combustion device also includes a central gas channel, a central air channel, an outer ring gas channel and an outer ring air channel coaxially sleeved from the inside to the outside, the central gas channel is connected to the central gas cavity, the central air channel is connected to the central air cavity, and the outer ring gas channel is connected to the outer ring gas cavity.

2. The ultra-low nitrogen oxide combustion device according to claim 1, characterized in that: It also includes a second driver, the outer ring connecting member is used to be connected to the fixing frame, and the second driver can drive the outer ring airway to rotate.

3. The ultra-low nitrogen oxide combustion device according to claim 1, characterized in that: The central jetting portion includes a central mixing chamber, a central collecting chamber and a central gas dispersion component. The central mixing chamber is connected to the central collecting chamber. The central gas dispersion component is arranged in the central mixing chamber. The central gas dispersion component is mesh-shaped. A central gas outlet is arranged on one end of the central collecting chamber away from the central mixing chamber. The central mixing chamber is connected to the central premixing chamber.

4. The ultra-low nitrogen oxide combustion device according to claim 3, characterized in that: The outer ring premixing chamber is located between the outer ring gas chamber and the outer ring air chamber. A plurality of outer ring gas holes are evenly distributed on the wall separating the outer ring gas chamber and the outer ring premixing chamber. The plurality of outer ring gas holes are used for the gas in the outer ring gas chamber to enter the outer ring premixing chamber. A plurality of outer ring air holes are evenly distributed on the wall separating the outer ring air chamber and the outer ring premixing chamber. The plurality of outer ring air holes are used for the air in the outer ring air chamber to enter the outer ring premixing chamber. The outer ring premixing chamber is connected to the outer ring jet portion.

5. The ultra-low nitrogen oxide combustion device according to claim 4, characterized in that: The outer ring jet section includes an outer ring mixing chamber, an outer ring collecting chamber and an outer ring gas dispersion component. The outer ring mixing chamber is connected to the outer ring collecting chamber. The outer ring gas dispersion component is arranged in the outer ring mixing chamber. The outer ring gas dispersion component is mesh-shaped. An outer ring air outlet is arranged on the end of the outer ring collecting chamber away from the outer ring mixing chamber. The outer ring mixing chamber is connected to the outer ring premixing chamber.

6. The ultra-low nitrogen oxide combustion device according to claim 5, characterized in that: The central gas dispersion component and the outer ring gas dispersion component are both PU foam blocks with flame retardant added.

7. The ultra-low nitrogen oxide combustion device according to claim 2, characterized in that: The outer ring air channel is connected to the outer ring air cavity, and a center ring tooth is fixedly provided on the outer side surface of the center air channel. The output end of the first driver is engaged with the center ring tooth, and the first driver can perform forward transmission, flipping and locking. The outer ring air channel is fixed with an outer ring tooth, and the output end of the second driver is engaged with the outer ring tooth, and the second driver can perform forward transmission, flipping and locking.

8. The ultra-low nitrogen oxide combustion device according to claim 7, characterized in that: It also includes a fixing frame, the central connecting member is a central bearing, the outer ring connecting member is an outer ring bearing, the inner ring of the central bearing is sleeved on the outer side of the central air channel outside the outer ring gas channel, the outer ring of the outer ring bearing is embedded in the fixing frame, the inner ring of the outer ring bearing is sleeved on the outer side of the outer ring air channel, and the outer ring of the outer ring bearing is embedded in the fixing frame.

9. The ultra-low nitrogen oxide combustion device according to claim 3, characterized in that: A plurality of air holes are evenly distributed on the partition wall between the central mixing chamber and the central collecting chamber. The plurality of air holes connect the central mixing chamber and the central collecting chamber, and the central premixing chamber connects to the edge of the central mixing chamber. The apertures of the air holes radially arranged along the partition wall gradually increase, and the diameter of the air holes located at the center of the partition wall is larger than the diameter of the air holes located around the partition wall.

Images