ND型内燃机车所用油水热交换器的主要换热元件,是φ10×1×1150毫米紫铜管。每台热交换器有管1434根,各管穿过9块管板及隔板的φ10毫米圆孔而组成一体。为防止滑油从板孔与铜管之间隙中漏过,希望间隙尽可能减小。因此,圆孔尺寸为φ10毫米。但是铜管总有不同程度的弯曲,必须平直后再进 ND diesel locomotive oil and water heat exchanger used in the main heat exchange element is φ10 × 1 × 1150 mm copper tube. Each heat exchanger has 1434 tubes, each of which passes through φ10 mm circular holes of nine tube plates and bulkheads. In order to prevent the oil from passing through the clearance between the plate hole and the copper pipe, it is desirable that the clearance be reduced as much as possible. Therefore, the hole size is φ10 mm. However, brass always have different degrees of bending, you must go straight after