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普通长型多孔喷油嘴结构如图1所示,喷油嘴针阀升程h一般为0.20～0.45mm,与轴针式喷油嘴不同,工作时燃油的通过截面积与针阀升程无关,而取决于喷孔的直径和孔数。喷孔直径一般为0.15～0.80mm,孔数不超过10个。喷孔轴线夹角及方向取决于燃烧室形状、大小及喷油器在缸盖上的安装位置与方向,轴线夹角一般为0°～180°。针阀开启压力一般为18～30MPa,随着柴油机和喷油泵的强化有逐渐增高的趋势。
Ordinary long porous nozzle structure shown in Figure 1, nozzle needle lift h is generally 0.20 ~ 0.45mm, unlike the axial needle nozzle, fuel cross-sectional area of work and needle valve lift It does not matter, depending on the diameter and number of holes. Spray hole diameter is generally 0.15 ~ 0.80mm, the number of holes does not exceed 10. The angle and direction of the spray hole axis depend on the shape and size of the combustion chamber and the installation position and direction of the injector on the cylinder head. The included angle between axes is generally 0 ° -180 °. Needle valve opening pressure is generally 18 ~ 30MPa, with the diesel engine and fuel injection pump has a gradual increase in the trend of strengthening.