Ground driving screw pump blowout preventer

Abstract

The invention relates to the technical field of ground equipment, in particular to a ground drive screw pump blowout preventer which comprises a blowout valve body and a combined valve element body, a vertically-through rod penetrating channel is formed in the middle of the blowout valve body, and a left valve cavity capable of being communicated with the rod penetrating channel is formed in the left side of the upper portion of the blowout valve body. And a right valve cavity communicated with the rod penetrating channel is arranged on the right side of the upper part of the well sealing valve body corresponding to the left valve cavity. The well plugging device is reasonable and compact in structure and convenient to use, the left sealing assembly and the right sealing assembly are moved by rotating the left valve rod and the right valve rod, and opening and closing of the well plugging device are achieved; by arranging the rod clamping hole which is in a big-end-down circular truncated cone shape, the left sealing assembly and the right sealing assembly which are arranged in a split mode can conveniently clamp and seal a polished rod or a drawing rod, and therefore the sealing device is suitable for pipe columns of different sizes. By arranging the upper sealing cylinder and the lower sealing cylinder, well liquid is prevented from flowing out of a gap between the upper plane and the lower plane of the valve plate rubber plate to cause leakage in the blowout preventer, and the blowout preventer has the advantages of being stable, reliable and good in sealing effect.

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