保压控制器作为深部煤炭原位保压取心器的核心部件，其密封设计对保压取心效果有着决定性作用。为了获取最优的密封结构方案，本文建立了保压控制器密封结构二维轴对称非线性接触模型，通过正交试验分析不同凹槽设计、锥角选型及摩擦因数对密封性能的影响，并研究不同闭合阶段、介质压力下密封圈各应力变化情况。结果表明：1.9 mm凹槽深度的30°锥角保压控制器密封效果最优；摩擦因数对密封性能的影响较小，应根据实际情况选择尽可能小的摩擦因数；室内打压试验结果表明保压控制器在较小预紧力作用下即可形成密封，且其密封性能随密封压力的升高仍维持稳定，该自适应密封特性保证了其密封能力与工作稳定性。研究成果提高了深部煤矿保压保瓦斯取心器的密封可靠性，对实现深部煤矿瓦斯精准测定具有重要工程意义。

As the pressure-preserved controller is a core component of the deep coal in-situ pressure-preserved coring device, its sealing design plays a decisive role in the effect of pressure-preserved coring. In order to obtain the optimal sealing structure, a two-dimensional axisymmetric nonlinear contact model was established for the sealing structure of the pressure-preserved controller. On this basis, the effects of different groove design, cone angle selection and friction coefficient on the sealing performance were analyzed by orthogonal test method. Meanwhile, the stress changes of the sealing ring under different closing stages and medium pressures were studied. The results show that: the pressure-preserved controller with 1.9 mm groove depth and 30° cone angle has the best sealing effect. The friction coefficient has little effect on the sealing performance, and it should be as small as possible according to the actual situation. The results of laboratory pressure test show that the pressure-preserved controller can form a seal under the action of a small preload, and its sealing performance remains stable with the increase of sealing pressure. The adaptive sealing characteristics ensure its sealing ability and working stability. The research results improve the sealing reliability of the pressure- and gas-preserved coring device in deep coal mines, which is of great engineering significance for the accurate determination of gas in deep coal mines.