我们地区1979年生产2BPZ_(CZ)—35型喷灌泵时,当时任务是4500台,但当生产到1500多台时,用户纷纷反映泵上D25型机械密封损坏情况严重,自吸泵不能自吸。问题出在哪里呢?首先检查了图纸、产品质量,没有发现问题。后来经过仔细分析研究损坏的机械密封件,发现机械密封上的弹簧的旋转方向与水泵叶轮的旋转方向有着密切的关系,选用机械密封时必须同时考虑这个问题。如弹簧的旋转方向与水泵 When producing 2BPZ_ (CZ) -35 sprinkler pump in our region in 1979, the task was 4500 units at that time. However, when it was produced to more than 1,500 units, the users all reported serious damage to the D25 mechanical seal on the pump and the self-priming pump could not self-priming . Where is the problem? First check the drawings, product quality, did not find the problem. Later, after careful analysis of damaged mechanical seals, we found that the direction of rotation of the spring on the mechanical seal is closely related to the direction of rotation of the pump impeller. This problem must be taken into account when selecting a mechanical seal. Such as the direction of rotation of the spring with the pump