Sampler with good sealing effect for oil extraction in oil field

The sampler for oil extraction in the oil field is good in sealing effect and comprises a sampling pipe, a scale window and a foot support are fixed to the outer wall of the left side and the bottom of the sampling pipe respectively, a pressure relief pipe fitting is installed on the outer wall, under the scale window, of the sampling pipe in a penetrating mode, and a liquid sealing plate is movably installed in the sampling pipe; the threaded sleeve is mounted at the center of the bottom of the sampling tube in a penetrating manner through bearing connection, a lead screw is mounted in the middle of the threaded sleeve in a penetrating manner, and the upper end of the lead screw is vertically and fixedly connected with the center of the bottom of the liquid sealing plate; the motor is fixed on the outer side wall of the foot bracket; and the connecting pipe is fixed at the fixed joint of the sampling pipe and the oil inlet piece. According to the sampler with the good sealing effect for oil extraction in the