Carburetor - High Pressure Gas
对于此应用,在涡轮增压式发动机上使用高压气体空燃混合器。
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图 1 | g01948136 |
高压气体空燃混合器的截面 (1) 膜片 (2) 感测孔 (3) 弹簧 (4) 燃油阀 (5) 腔室 (6) 气动喇叭 (7) 环 (8) 外腔室 (9) 燃油出口 (10) 内腔室 (11) 燃油进口 (12) 怠速调整 (13) 排放控制蝶形阀 (14) 止推盘 (15) 平衡管连接 |
空气经过气动喇叭 (6) 流入空燃混合器。 空气充满外腔室 (8) 。 当发动机真空导致膜片 (1) 移动离开环 (7) 时,空气流入内腔室 (10) (混合腔室)。
燃油经过燃油进口 (11) 流入空燃混合器。 然后燃油流经排放控制蝶形阀 (14) ,进入空燃混合器的中心,然后流入燃油出口 (9) 。 燃油阀 (4) 固定在膜片 (1) 上。 当膜片移动离开环 (7) 时,燃油流经燃油阀 (4) 进入内腔室 (10) 。 燃油与通过气动喇叭进入内腔室的新鲜空气混合。 空气 / 燃油混合物流经油门板 (14) 进入进气歧管。
发动机停机时,弹簧 (3) 保持膜片紧靠在环 (7) 。 在这个位置燃油阀闭合。 空气或燃油不能进入内腔室。 发动机起动时,活塞的进气冲程造成气缸中的真空。 内腔室中产生了低压。 腔室 (5) 膜片后面通过孔 (2) 感受到低压。 两个腔室之间的压力变得平衡。 当膜片上的进气压力变得高于弹簧力时,膜片会开始移动。
随着膜片被进气压力推动,燃油阀会移动。 随着燃油阀移动,燃油进口打开。 空气 / 燃油混合物可以进入内腔室。 少量空气也会进入内腔室。 这些少量空气体内各国怠速调整 (12) 的开口进入。
当发动机以恒定负载和转速运行时,膜片位置保持不变。 膜片只在燃料需求发生变化时才会移动。
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