37results about How to "Increased seal contact area" patented technology

A staged fracturing sliding sleeve used for an oil well comprises a sliding sleeve outer shell, an inner sliding sleeve, a blocking piece and a suppressing pressure control device. The sliding sleeve outer shell is used for being connected to an oil casing pipe, and a first fracturing hole is formed in the side wall of the outer shell. The inner sliding sleeve is fixed in the outer shell through a pin which penetrates through the side wall of the outer shell and the side wall of the inner sliding sleeve, and a second fracturing hole is formed in the side wall of the inner sliding sleeve, wherein the first fracturing hole and the second fracturing hole are staggered in a radial direction. The blocking piece and the suppressing pressure control device are arranged in the inner sliding sleeve. The suppressing pressure device comprises an actuating mechanism which is used for forcing the blocking piece to keep in an opened position, wherein the actuating mechanism enables the blocking piece to move to a closed position when the suppressing pressure control device receives a preset signal, seals an inner cavity of the inner sliding sleeve and forms pressure accumulation. When the pressure is increased to overcome shear force of the pin, the pin is sheared, and the inner sliding sleeve slides along the axial direction until the first fracturing hole aligns at the second fracturing hole in the axial direction of the sliding sleeve.

The invention discloses a three-colour injection moulding device. According to the invention, a middle material ejection gun transversally moves by virtue of a movement track, and the position of a middle charge hole of a moulding die can be adapted through large-range transversal movement of the middle material ejection gun; after a locking device is unscrewed, a middle adapter elbow is capable of rotating with a conical head at the discharge end of the middle material ejection gun by virtue of a connector of a first elbow part, so that a middle material ejection nozzle is specifically aligned with the middle charge hole of the moulding die, and the locking device can be screwed, so that location convex bars and strip-shaped concave grooves are correspondingly buckled to guarantee no desiderative rotation of the middle adapter elbow; and after the locking device is screwed, the surface and a conical inner surface of the conical head are mutually matched to clamp elastic sealing cushion layers to seal on the contact surfaces, and external annular convex lines and internal annular convex lines can clamp the elastic sealing cushion layers at the two sides, so that the surfaces of the elastic sealing cushion layers are deformed and mutually embedded in the external annular convex lines and the internal annular convex lines, thus sealing contact areas are remarkably increased, and the sealing effect is better.

The invention belongs to the technical field of pellet circular cooler water sealing, and particularly relates to a pellet circular cooler transverse floating end sealing device. The pellet circular cooler transverse floating end sealing device comprises an inner water sealing tank, an outer water sealing tank, an inner sealing insertion plate, an outer sealing insertion plate and a sealing box. The pellet circular cooler transverse floating end sealing device is characterized in that a transverse water sealing tank is arranged between the inner water sealing tank and the outer water sealing tank; the sealing box is arranged above the transverse water sealing tank and is supported by a roll supporting rack; sealing felt is arranged on the upper surface and the two side surfaces of the sealing box respectively; the sealing felt on the upper surface of the sealing box is in elastic contact sealing with a rotary trolley and a rotary frame; and the sealing felt on the two sides of the sealing box is in elastic contact sealing with the inner sealing insertion plate and the outer sealing insertion plate respectively. Compared with the conventional sealing structure, the pellet circular cooler transverse floating end sealing device has the characteristics of sealing reliability and no dead angle, and because elastic sealing adapts to complicated sealing surfaces, a transverse floating structure eliminates additional resistance and damage to the sealing box by the rotary trolley, the inner sealing insertion plate and the outer sealing insertion plate.

The invention discloses a high torsion-resistant fully sealed drill pipe threaded joint, comprising an external threaded joint and an internal threaded joint; the main end surface of the internal threaded joint of the internal threaded joint is a torus with an inclination angle, and the end hole of the internal thread is a conical hole ; The outer shoulder surface on the externally threaded joint is a torus with an inclination angle, the base of the tapered pipe thread of the externally threaded joint is an elliptical arc surface, the length of the major semi-axis of the ellipse section of the elliptical arc surface is b, and the ellipse of the elliptical arc surface The length of the minor axis of the section is 2a, and the ratio 2a / b of the minor axis length 2a to the major semiaxis length b is equal to the conical hole taper of the end hole of the internal thread; the pitch T of the external thread of the front section and the internal thread of the front section 2 Greater than or equal to the pitch T of the rear external thread and the rear internal thread 1 . It can not only effectively improve the anti-torque ability of the threaded drill pipe joint, but also the sealing surface is reliable, the elastic deformation of the sealing contact is stable, and the sealing is tight. It is very suitable for the exploration and exploitation of oil and gas deep wells, ultra-deep wells and complex wells.