58results about How to "Achieve secondary sealing" patented technology

A cold and hot double-acting packer comprises a plurality of liquid outlet holes formed in an inner central pipe sleeved with an outer central pipe, and a liquid inlet hole is formed in the outer central pipe sleeved with a piston, a steel bushing is connected with the upper end of the piston, the upper end of the steel bushing is connected with an upper joint, and a locking piece sleeve and a snap ring sleeve are clamped between the steel bushing and the outer central pipe; a plurality of rubber sleeves are nested on the outer central pipe and located at the lower end of the piston, and distance rings are arranged between every two rubber sleeves; an expansion cone is nested on the outer central pipe and located at the lower ends of the plurality of rubber sleeves, the lower end of the expansion cone is connected with a cylinder, and an accommodating cavity is formed among the cylinder body, the expansion cone and the outer central pipe and filled with an expansion fluid; and a sealing rubber sleeve is clamped between the plurality of rubber sleeves and the expansion cone. The cold and hot double-acting packer can perform pressure set by aid of the ground at the room temperature and achieve secondary sealing through hot expansion of the fluid at a high temperature for steam injection, the oil jacket annulus sealing reliability is high, and the oil reservoir production degree is increased.

The invention belongs to the technical field of sealed packaging containers, and particularly relates to a blister packaging box which comprises a box body and a box cover. The edge at the upper end of the box body is provided with a first arc, the outer side at the upper end of the box body is provided with a second arc, and the upper end of the box body is covered with the box cover. The secondarc is arranged at the outer side at the lower end of the first arc, the inner side of the outer end of the box cover is concave, and a clamping arc is arranged on the inner surface of the outer sideof the box cover. A concave cavity at the outer end of the box cover can be tightly connected with the edge at the upper end of the box body in a clamped mode, the outermost end of the box cover can be inserted into a groove at the edge of the upper end of the box body, and the clamping arc can be fixedly clamped with the second arc. The blister packaging box is mainly used for solving the problems that in the prior art, when cheese is contained in the blister packaging box for transportation, a packaging box cover is prone to falling off, the cheese is polluted, and meanwhile the cheese leakage is prone to occurring when a transportation vehicle jolts.

The invention relates to a waterproof electrical control box, comprising a controller box body, a first sealing piece, a lining board, a second sealing piece and a baffle, wherein the baffle, the second sealing piece, the lining board and the first sealing piece are sequentially stacked from outside to inside and fastened at an opening of the controller box body by virtue of fastening screws. In the waterproof electrical control box provided by the invention, wiring ducts with open ends consistent in orientation are utilized, arranged wiring harnesses can be rapidly arranged in the wiring ducts at one time, and waterproof gaskets arranged at intervals are utilized for realizing secondary sealing on the controller box body, so that waterproof performance of the waterproof electrical controlbox is improved.