Long -term sealing device of oil recovery well head

The utility model provides a long -term sealing device of oil recovery well head. The sealed effect of the current seal box of main solution is poor, sealed short problem of cycle. Its characterized in that: end?screw thread?connection is gone up in sealing drum (1) has gland (4), gland (4) have put the spring in proper order down and (3) are held in the palm in last extrusion, spring and extrusion support (2) have down been put down in proper order in sealing drum (1), lower extrusion support (2) and last extrusion support (3) correspond the face and are ball?grooves, extrusion support (2) and last extrusion ask sealing drum (1) the interior notes between (3) to have the rubber granule down, have on sealing drum (1) lateral wall ascending pipe (5), be connected with check valve (6) on ascending pipe (5), be connected with the impregnation valve on check valve (6) outer end ascending pipe (5). The long -term sealing device of oil recovery well head has sealed effectually, the characteristics of sealed cycle l