矿井排水多采用D型泵,压力表和真空表是排水系统重要的两个仪表,用于检测水泵的排水管压力和吸水管真空度。多数情况下,在D型泵吸水侧预留有安装真空表的螺孔,真空表缓冲管的铜螺纹可直接拧入,但有时也有不匹配的情况。为此,我们设计出一种联接真空表铜管与水泵吸水侧螺孔的联接头,使用效果很好。图1为使用在 Drainage pump more use of D-type pumps, pressure gauges and vacuum gauge drainage system is an important two instruments used to detect the pump drain pressure and suction pipe vacuum. In most cases, a screw hole for vacuum gauges is reserved on the suction side of the D-type pump. The copper threads of the vacuum gauge buffer tube can be directly screwed in, but sometimes there is a mismatch. To this end, we designed a connection between the vacuum gauge brass and pump suction side of the screw coupling, the use of good results. Figure 1 is used in