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CN-121993050-A - Multiple sealed special thread oil pipe nipple

CN121993050ACN 121993050 ACN121993050 ACN 121993050ACN-121993050-A

Abstract

A multi-seal special thread oil pipe nipple relates to the technical field of petroleum exploitation facilities. The nipple body is provided with a plug hole below the central hole, the inner diameter of the plug hole is in clearance fit with the connected oil pipe, two inner ring grooves are formed in the plug hole, an O-shaped sealing ring is installed in each inner ring groove, the nipple body is provided with a pushing hole at the lower part of the plug hole, the nipple body is provided with a bearing pipe at the lower part of the pushing hole, an outer taper sleeve and an inner taper sleeve are installed in the pushing hole, and the outer circle of the outer taper sleeve is in clearance fit with the pushing hole. The invention has the beneficial effects that the connection part of the oil pipe nipple and the oil pipe is sealed by the O-shaped sealing ring, the oil pipe is sealed in an auxiliary way by the rubber gasket, the elastic inner cone sleeve is arranged between the outer ring groove B of the oil pipe and the nipple body to bear the tensile force, the installation and the disassembly can be completed by rotating the gear ring, the installation and the disassembly are quick, the strength of the oil pipe is not damaged, and the limit sleeve and the locating sleeve are locked circumferentially by the self-locking propelling sleeve, so that the locking is firm.

Inventors

  • WANG CHENGJUN
  • WANG CHEN

Assignees

  • 大庆市璞庆钻采设备制造有限公司

Dates

Publication Date
20260508
Application Date
20260410

Claims (7)

  1. 1. The utility model provides a special screw thread oil pipe nipple joint of multiple seal, includes nipple joint body (1), its characterized in that: the length center of the nipple body (1) is provided with a central hole (104), the diameter of the central hole (104) is equal to the inner hole diameter of a connected oil pipe (10), the nipple body (1) is of a symmetrical structure at the upper side and the lower side of the central hole (104), the nipple body (1) is provided with a plug hole (103) below the central hole (104), the inner diameter of the plug hole (103) is in clearance fit with the connected oil pipe (10), the plug hole (103) is internally provided with two inner annular grooves (106), an O-shaped sealing ring (8) is arranged in the inner annular grooves (106), the nipple body (1) is provided with a propelling hole (101) at the lower part of the plug hole (103), the nipple body (1) is provided with a force bearing pipe (108) at the lower part of the propelling hole (101), an outer conical sleeve (3) and an inner conical sleeve (2) are arranged in the propelling hole (101), the outer circle of the outer conical sleeve (3) is in clearance fit with the propelling hole (101), the conical sleeve (3) is a hole, the conical hole large diameter end of the outer conical sleeve (3) is positioned at the lower part, the conical sleeve is positioned between the outer conical sleeve (2) and the outer conical sleeve is in the same size as the inner conical sleeve (2), the inner taper sleeve (2) is outwards provided with a cutting seam (201) along one side of the axis, and the inner taper sleeve (2) is made of spring steel; Screw holes (109) penetrating up and down are formed in the bearing pipe (108), the number of the screw holes (109) is four, the screw holes (109) are uniformly distributed along the circumference of the bearing pipe (108), the screw holes (109) are in threaded connection with the screw rod (4), the upper part of the screw rod (4) is propped against the outer cone sleeve (3), the lower part of the screw rod (4) is fixedly connected with the gear (5), the outer side of the gear (5) is in meshed transmission connection with the gear ring (6), the upper part of the gear ring (6) is fixedly connected with the positioning sleeve (7) through a bolt, the outer circle of the bearing pipe (108) is provided with the outer ring groove A (107), and the inner hole of the positioning sleeve (7) is embedded into the outer ring groove A (107); The nipple body (1) is provided with a key groove (105) at the upper part of an outer ring groove A (107), the nipple body (1) is sleeved with a limit sleeve (11) at the position of the key groove (105), an inner hole of the limit sleeve (11) is fixedly connected with a flat key (1101), the flat key (1101) is inserted into the key groove (105), the upper end surface of the locating sleeve (7) is provided with a locating hole (701), the lower part of the limit sleeve (11) is fixedly connected with a locating column (14), the locating column (14) corresponds to the locating hole (701) in position on the circumference, the nipple body (1) is in threaded connection with a pushing sleeve (12) at the upper part of the limit sleeve (11), and the lower part of the pushing sleeve (12) is propped against the limit sleeve (11); an outer ring groove B (1001) is processed at the end part of the connected oil pipe (10).
  2. 2. The multi-seal special-thread oil pipe nipple of claim 1, wherein the connecting threads of the pushing sleeve (12) and the nipple body (1) are non-standard self-locking threads, and the conical joint angle of the inner conical sleeve (2) and the outer conical sleeve (3) is a non-self-locking friction angle.
  3. 3. The multi-seal special threaded oil pipe nipple of claim 1, wherein when the inner cone sleeve (2) is compressed and embedded into an outer ring groove B (1001) of the oil pipe (10), the upper end surface of the inner cone sleeve (2) is connected with the lower end surface (102) of the plug hole (103) at the same time; After the oil pipe (10) is inserted into the nipple body (1), the lower end face (102) of the insertion hole (103) of the nipple body (1) is flush with the upper end face of the outer ring groove B (1001) of the oil pipe (10).
  4. 4. The multi-seal special threaded oil pipe nipple of claim 1, wherein a rubber pad (9) is adhered to the lower end surface (102).
  5. 5. The multi-seal special-thread oil pipe nipple of claim 1, wherein the pushing sleeve (12) is provided with a permanent magnet ring (13) at the connection part with the limit sleeve (11).
  6. 6. A multi-seal special threaded tubing nipple as claimed in claim 1 wherein the width of the key slot (105) is greater than the width of the flat key (1101).
  7. 7. The multi-seal special threaded oil pipe nipple of claim 1, wherein the positioning sleeve (7) is of a two-half integrated structure.

Description

Multiple sealed special thread oil pipe nipple Technical Field The invention relates to the technical field of petroleum exploitation facilities, in particular to a multi-seal special threaded oil pipe nipple. Background The nipple is divided into an oil pipe nipple and a sleeve nipple, is a common accessory in industrial pipeline connection, is divided into a double-end external thread, a single-end external thread and a flat-end external thread, two ends of an existing oil pipe nipple connected with the oil pipe are connected through conical pipe threads, the conical pipe threads are processed on the oil pipe, the strength of an oil pipe body is reduced, the oil pipe nipple is required to be disassembled and assembled frequently, the threads are worn due to repeated disassembly and assembly, and the tightness of the joint of the oil pipe nipple and the oil pipe is reduced. Disclosure of Invention The invention provides a multi-seal special-thread oil pipe nipple, which aims to solve the problems of low strength and unreliable connection of the existing oil pipe nipple. The technical scheme provided by the invention is that the multi-seal special threaded oil pipe nipple comprises a nipple body, wherein the center of the length of the nipple body is provided with a center hole, the diameter of the center hole is equal to the diameter of an inner hole of a connected oil pipe, the nipple body is of a symmetrical structure at the upper side and the lower side of the center hole, an inserting hole is formed below the center hole in the nipple body, the inner diameter of the inserting hole is in clearance fit with the connected oil pipe, two inner ring grooves are formed in the inserting hole, an O-shaped sealing ring is arranged in the inner ring grooves, a pushing hole is formed in the lower part of the inserting hole in the nipple body, a bearing pipe is arranged at the lower part of the pushing hole, an outer taper sleeve and an inner taper sleeve are arranged in the pushing hole, the outer circle of the outer taper sleeve is in clearance fit with the pushing hole, the large diameter end of the conical hole of the outer taper sleeve is positioned at the lower part, the outer circle of the inner taper sleeve is in a conical cylinder, the inner taper sleeve is in clearance fit between the outer taper sleeve and the inner taper sleeve, the inner hole of the inner taper sleeve is in the same size with the inserting hole in the natural condition, a cutting slit is formed outwards along one side of the axis, and the inner taper sleeve is made of spring steel; The bearing pipe is provided with screw holes which are vertically communicated, the number of the screw holes is four, the screw holes are uniformly distributed along the circumference of the bearing pipe, the screw holes are in threaded connection with screws, the upper parts of the screws are propped against an outer taper sleeve, the lower parts of the screws are fixedly connected with gears, the outer sides of the gears are in meshed transmission connection with a gear ring, the upper parts of the gears are fixedly connected with a positioning sleeve through bolts, the outer circle of the bearing pipe is provided with an outer annular groove A, and the inner holes of the positioning sleeve are embedded into the outer annular groove A; The upper part of the outer ring groove A of the pup joint body is provided with a key groove, the position of the key groove is sleeved with a limit sleeve, an inner hole of the limit sleeve is fixedly connected with a flat key, the flat key is inserted into the key groove, the upper end surface of the limit sleeve is provided with a positioning hole, the lower part of the limit sleeve is fixedly connected with a positioning column, the positioning column corresponds to the positioning hole on the circumference, the upper part of the limit sleeve is in threaded connection with a pushing sleeve, and the lower part of the pushing sleeve is propped against the limit sleeve; An outer ring groove B is processed at the end part of the connected oil pipe. The connecting screw thread of the propelling sleeve and the pup joint body is a non-standard self-locking screw thread, and the conical joint angle of the inner taper sleeve and the outer taper sleeve is a non-self-locking friction angle. When the inner taper sleeve is compressed and embedded into the outer ring groove B of the oil pipe, the upper end surface of the inner taper sleeve is connected with the lower end surface of the plug hole at the same time; after the short section body is inserted into the oil pipe, the lower end face of the insertion hole of the short section body is flush with the upper end face of the outer ring groove B of the oil pipe. A rubber pad is adhered on the lower end face. The propulsion sleeve is provided with a permanent magnet ring at the connection part with the limit sleeve. The width of the key groove is larger than that of the flat key. T