Carburetor
汽化器将燃气和空气混合起来，以形成可燃混合气。
此应用上的 IMPCO 汽化器用于低压燃气系统。
汽化器上的燃油喷嘴和燃油阀可以互换。
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| 图 1 | g02393637 |
流入汽化器的空气和燃气流 (1) 过滤后的进气 (2) 气体 (1-2) 空气/燃料混合气 | |
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| 图 2 | g02394279 |
汽化器和处于打开位置的油门的剖视图 (3) 弹簧 (4) 燃油阀 (5) 燃油喷嘴 (6) 膜片 (7) 油道 (8) 动力阀 (9) 油门控制装置 | |
当发动机停机时，弹簧 (3) 将燃油阀 (4) 的 O 形密封圈压在燃油喷嘴 (5) 上。 没有燃油可以进入汽化器的混合室。
可以调节动力阀 (8) ，限制进入汽化器的燃油量。
当发动机起动时，活塞的进气冲程在气缸中产生真空。 真空将过滤后的进气 (1) 吸入汽化器。 此真空通过通道 (7) 吸气并作用在膜片 (6) 上。 随着膜片上的真空力克服弹簧 (3) 的力，燃油阀从燃油喷嘴移开。 随后，将允许过滤后的空气和燃气 (2) 进入混合室并混合。 随着空气/燃料混合气 (1-2) 经过涡轮增压器压缩机和后冷器，空气燃料混合气完全混合。 油门控制 (9) 控制允许进入发动机的混合气体积。
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。
Caterpillar Information System:
C7.1 Industrial Engine Turbocharger - Install - First Stage Turbocharger
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312E, 312F, 313F, 316E, 316F, 318E, 318F, 320E, 320F, 323E, 323F, 324E, 325F, 326F, 329E, 329F, 330F, 335F, 336E, 336F, 340F, 349E, 349F, 352F, 374F and 390F Excavators and 336E MHPU and 349E MHPU Mobile Hydraulic Power Units Air Conditioning and Hea Refrigerant System - Evacuate
312E, 312F, 313F, 316E, 316F, 318E, 318F, 320E, 320F, 323E, 323F, 324E, 325F, 326F, 329E, 329F, 330F, 335F, 336E, 336F, 340F, 349E, 349F, 352F, 374F and 390F Excavators and 336E MHPU and 349E MHPU Mobile Hydraulic Power Units Air Conditioning and Hea Manifold Gauge Set (Refrigerant) - Install
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312E, 312F, 313F, 316E, 316F, 318E, 318F, 320E, 320F, 323E, 323F, 324E, 325F, 326F, 329E, 329F, 330F, 335F, 336E, 336F, 340F, 349E, 349F, 352F, 374F and 390F Excavators and 336E MHPU and 349E MHPU Mobile Hydraulic Power Units Air Conditioning and Hea Refrigerant Recovery
312E, 312F, 313F, 316E, 316F, 318E, 318F, 320E, 320F, 323E, 323F, 324E, 325F, 326F, 329E, 329F, 330F, 335F, 336E, 336F, 340F, 349E, 349F, 352F, 374F and 390F Excavators and 336E MHPU and 349E MHPU Mobile Hydraulic Power Units Air Conditioning and Hea Required Tools
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312E, 312F, 313F, 316E, 316F, 318E, 318F, 320E, 320F, 323E, 323F, 324E, 325F, 326F, 329E, 329F, 330F, 335F, 336E, 336F, 340F, 349E, 349F, 352F, 374F and 390F Excavators and 336E MHPU and 349E MHPU Mobile Hydraulic Power Units Air Conditioning and Hea Refrigerant Leakage - Test
312E, 312F, 313F, 316E, 316F, 318E, 318F, 320E, 320F, 323E, 323F, 324E, 325F, 326F, 329E, 329F, 330F, 335F, 336E, 336F, 340F, 349E, 349F, 352F, 374F and 390F Excavators and 336E MHPU and 349E MHPU Mobile Hydraulic Power Units Air Conditioning and Hea Refrigerant Compressor Oil - Check
312E, 312F, 313F, 316E, 316F, 318E, 318F, 320E, 320F, 323E, 323F, 324E, 325F, 326F, 329E, 329F, 330F, 335F, 336E, 336F, 340F, 349E, 349F, 352F, 374F and 390F Excavators and 336E MHPU and 349E MHPU Mobile Hydraulic Power Units Air Conditioning and Hea Refrigerant System - Charge
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