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一、前言活塞式制冷压缩机的容积效率以V_s/V_h表示(V_s:实际吸气量,V_h:理论吸气量),称为吸气系数λ,即λ=V_s/V_h。影响吸气系数的因素很多,其中余隙容积(V_c)的影响很大。而直接与余隙容积有关的因素是活塞上死点间隙,另外还有排气孔的容积。为了提高压缩机的工作效率,常常需要把余隙容积降低,这在用于低温的机器尤其重要。但由于加工工艺的限制,活塞上死点间隙不可能为0。另一种办法是减少排气孔的容积,即减少排气孔直径或孔数。但这样一般认为会带来排气阻力大的缺点。本文是就后一种减少余隙容积的方法,由吸排气过程活塞平均
I. Introduction The volumetric efficiency of a piston-type refrigerant compressor is expressed as V_s / V_h (V_s: actual amount of suction, V_h: theoretical amount of suction), which is called as the suction coefficient λ, that is, λ = V_s / V_h. There are many factors that affect the inspiratory coefficient, of which the clearance volume (V_c) has a great influence. And directly related to the clearance volume of the piston dead center clearance, in addition to the vent volume. In order to improve the working efficiency of the compressor, it is often necessary to reduce the clearance volume, which is especially important for machines for low temperatures. However, due to the limitations of the processing technology, the piston dead center clearance can not be zero. Another approach is to reduce the vent volume, which reduces the vent diameter or number of holes. However, this is generally considered to bring the shortcomings of large exhaust resistance. This article is about the latter to reduce the clearance volume method, by the suction and exhaust process piston average