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精确计算滑片式压缩机的容积比,对计算内压力比、功率消耗、确定排气孔口位置等有着很大的影响。它是压缩机热力计算以及结构设计的主要依据。如图1所示,通常容积比表示为: 式中,β——为相邻两滑片间的中心角,β=2π/Z(Z表示滑片数),弧度; ε——相对偏心值,ε=e/R; φ——基元面积f_φ之中心线O_1A与连心线O_1O_2之间的夹角,孤度式(1)是假定滑片的相对厚度σ(=Δ/R)=O条件下的理想容积比计算式。实际滑片式压缩机,其滑片厚度总是有限的。滑片厚度较大时,特别是采用非金属滑片时,由于不考虑滑片自身厚度,将使容积比的计算误差高达
Accurately calculating the vane compressor volume ratio, the calculation of pressure ratio, power consumption, to determine the location of the exhaust port has a great impact. It is the main basis for compressor thermal calculation and structural design. As shown in Figure 1, the volumetric ratio is usually expressed as: where β-- is the central angle between two adjacent vanes, β = 2π / Z (Z is the number of vanes), radian, ε is the relative eccentricity is the angle between the centerline O_1A and the connecting line O_1O_2 of the elementary area f_φ, and (1) is the relative thickness of the sliding vane σ (= Δ / R) = O condition of the ideal volume ratio formula. The actual vane compressor, the vane thickness is always limited. When the vane thickness is large, especially when the non-metallic vane is used, the calculation error of the volume ratio will be as high as not considering the thickness of the vane itself