BW850泥浆泵为上海探矿机械厂生产。该泵具有输出压力大、流量稳定和超压自动保护等优点，是正循环钻孔的良好设备。然而由于该泵泥浆缸的有杆脏外漏故障频率较高，严重影响了施工的正常进行。原有杆腔盘根式密封结构如附图b所示。经我单位近20年的使用发现，其一次安装盘根不 BW850 mud pump for the Shanghai Prospecting Machinery Factory production. The pump has the advantages of large output pressure, stable flow rate and automatic overpressure protection. It is a good equipment for positive circulation drilling. However, due to the high frequency of the malfunction of the rod mud leakage of the mud pump cylinder, the normal operation of the construction is seriously affected. Original rod chamber packing seal structure shown in Figure b. After my unit nearly 20 years of use found that its installation of packing is not