Open type piston unloader

The utility model relates to an open type piston unloader, which belongs to the technical field of reciprocating compressors and comprises an unloading body, and the unloading body comprises an unloading body, a piston rod and a piston rod, and the opening cavity is formed in the unloading body. According to the utility model, the five-in-one structural design is adopted, the transformation is simple and easy, and the cost is reduced; parts are few, installation is convenient, and manpower is saved; maintenance is simple, the end face of the unloading body and the cylinder head are in metal linear sealing, as long as the unloading body leaves the sealing face, gas can pass through the opening cavity of the unloading body and immediately fill a clearance cavity of the whole cylinder head, radial friction between the unloading body and the cylinder head is reduced, and the service life of a non-metal sealing piece is prolonged. 本实用新型涉及一种开口式活塞卸荷器，属于往复式压缩机技术领域，包括卸荷本体，所述卸荷本体包括：卸荷体，通过连接螺栓与卸荷器执行机构上的第一拉杆相连；开口腔，开设在所述卸