US 12,305,855 B2
Air-fuel mixer and combustion system
Wen Quan Zhou, Shanghai (CN); Jun Cai, Shanghai (CN); Shuai Shuai Yi, Shanghai (CN); and Xiao Jun Zhao, Shanghai (CN)
Assigned to SIEMENS AKTIENGESELLSCHAFT, Munich (DE)
Appl. No. 17/784,876
Filed by Siemens Aktiengesellschaft, Munich (DE)
PCT Filed Jul. 17, 2020, PCT No. PCT/IB2020/056734
§ 371(c)(1), (2) Date Jun. 13, 2022,
PCT Pub. No. WO2021/116783, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 201911279906.0 (CN), filed on Dec. 13, 2019; and application No. 201922250746.9 (CN), filed on Dec. 13, 2019.
Prior Publication US 2023/0010579 A1, Jan. 12, 2023
Int. Cl. F23N 1/02 (2006.01); B01F 23/10 (2022.01); B01F 25/312 (2022.01); B01F 101/00 (2022.01); F23D 14/62 (2006.01)
CPC F23N 1/025 (2013.01) [B01F 23/191 (2022.01); B01F 25/312531 (2022.01); F23D 14/62 (2013.01); B01F 2101/501 (2022.01); F23N 2225/04 (2020.01); F23N 2225/14 (2020.01); F23N 2235/06 (2020.01); F23N 2235/10 (2020.01)] 6 Claims
OG exemplary drawing
 
1. A mixer disposed in a fuel gas combustion system and mixing air and fuel gas to form flammable mixed gases, the mixer comprising:
a Venturi tube having an air inlet, a fuel gas inlet, a gas mixture outlet, a central axis direction, and a throat positioned between the air inlet and the gas mixture outlet in the central axis direction, wherein the fuel gas inlet is disposed at the throat; and
an adjustment component disposed in the Venturi tube downstream of the throat, the adjustment component drivable to move towards or away from the throat in the central axis direction, thereby changing a flow area of gas in the Venturi tube;
wherein the adjustment component includes a conical valve plug with a conical outer surface thereof at a side facing towards the throat and fitting an inner surface of the Venturi tube at the throat;
a drive mechanism for driving the adjustment component, wherein the drive mechanism includes: a central shaft positioned in the Venturi tube to reciprocate in the central axis direction, the adjustment component being fitted around and fixed to the central shaft; and a transmission assembly having a first end connected to the central shaft and a second end connected to an actuator, the transmission assembly impelling the central shaft to move under the driving action of the actuator;
wherein the transmission assembly includes: a transmission shaft extending in a direction perpendicular to the central axis direction and rotating under the driving action of the actuator; and a shaft levering device having a first end connected to the transmission shaft in a fixed manner and a second end connected to the central shaft;
wherein the transmission shaft rotates and drives the shaft levering device, the shaft levering device in turn pushing the central shaft to move linearly along the central axis;
the shaft levering device is fitted around the transmission shaft in a fixed manner;
the shaft levering device has two lever parts extending in a direction perpendicular to the transmission shaft;
the two lever parts are spaced apart parallel to one another and configured such that the central shaft is adapted to be positioned therebetween;
each lever part having a slot hole in a length direction thereof;
the mixer further comprises a connecting rod adapted to pass through the slot holes of the two lever parts and a through-hole in the central shaft positioned between the two lever parts, the connecting rod parallel to the transmission shaft.