Background technique
Electric submersible pump is a underground equipment important in the oil mining, mainly comprises oil-submersible motor, seal protector, separator, oil-immersed pump etc.Seal protector is arranged between oil-submersible motor and the separator, and by expansion of self or the variation in pressure of shrinking balance oil-submersible motor inner chamber to cause owing to temperature variation, therefore, seal protector is the guarantee of oil-submersible motor safe operation.Existing seal protector adopts bladder structure, because leather bag is at high temperature easily aging, and distortion; even break, therefore, be difficult to play the effect of protection oil-submersible motor; not only cause shorten greatly the working life of Electric Submersible Pump Unit, and serious threat is to the running safety of oil-submersible motor.
The model utility content
The purpose of this utility model is to provide a kind of safe and reliable Electric Submersible Pump Unit seal protector.
The purpose of this utility model is achieved in that a kind of Electric Submersible Pump Unit seal protector, it is characterized in that: the sealing protector is the metal bellows type, is made of the double-level-metal bellows.
The front and back ends of above-mentioned double-level-metal bellows is equipped with cover plate, and described front end also is provided with positioning ring, and the rear end is provided with joint and enclosing cover.
Locate by circlip between the interior pipe of above-mentioned joint and above-mentioned double-ply bellows.
Seal by seal ring between the interior pipe of above-mentioned joint and above-mentioned double-ply bellows.
The cover plate of above-mentioned double-level-metal bellows one end and the welding of above-mentioned positioning ring, the cover plate of the other end and described joint, enclosing cover welding.
Above-mentioned double-ply bellows comprises inner corrugated pipe and outward corrugated tube, the internal circular surfaces of above-mentioned positioning ring and the welding of described inner corrugated pipe, outer round surface and the welding of described outward corrugated tube.
The cover plate welding of above-mentioned positioning ring and described front end.
The cover plate of above-mentioned rear end and above-mentioned joint, enclosing cover welding.
When at high temperature working, the oil-submersible motor running produces a large amount of heats, causes the expansion of dynamo oil and the rising of motor oil pressure, for conducting dynamo oil and balance pressure, the double-level-metal bellows reaches counterpressure by self expanding the expansion capacity, and the dynamo oil that overflows of splendid attire oil-submersible motor; When temperature descends, dynamo oil and counterpressure that the double-level-metal bellows compensates in the oil-submersible motor to be shunk by self contraction.
The utlity model has following beneficial effect; the utility model adopts double-ply bellows to constitute metal bellows type seal protector; not only overcome existing seal protector and adopted problems such as leather bag at high temperature easily wears out, is out of shape, breaks; and have characteristics high temperature resistant, anticorrosive, good seal performance; guaranteed the effect of seal protector balance pressure reduction and protection oil-submersible motor; improved the working life of Electric Submersible Pump Unit; and assembling is simple; reliable in structure is particluarly suitable for the Electric Submersible Pump Unit that operates under the mal-condition.
Embodiment
Embodiment, a kind of Electric Submersible Pump Unit seal protector, be the metal bellows type, constitute by the double-level-metal bellows, be arranged on by interior pipe 5 in the rotating shaft 10 of seal protector, the two ends of this double-level-metal bellows are equipped with cover plate, and an end casing 2-1 is provided with positioning ring 1 outward, and the other end cover plate 2-2 is provided with joint 7 and enclosing cover 6 outward; By circlip 8 location, seal between the interior pipe 5 of joint 7 and this double-ply bellows by O RunddichtringO 9; Cover plate 2-1 and positioning ring 1 welding, cover plate 2-2 and joint 7, enclosing cover 6 welding; This double-ply bellows comprises inner corrugated pipe 4 and outward corrugated tube 3, the internal circular surfaces of positioning ring 1 and inner corrugated pipe 4 welding, outer round surface and outward corrugated tube 3 welding.
When at high temperature working, the oil-submersible motor running produces a large amount of heats, cause the expansion of dynamo oil and the rising of motor oil pressure, for conducting dynamo oil and balance pressure, the double-level-metal bellows reaches the dynamo oil that counterpressure and splendid attire oil-submersible motor overflow by self expanding the expansion capacity; When temperature descends, dynamo oil and counterpressure that the double-level-metal bellows compensates in the oil-submersible motor to be shunk by self contraction.