CN202578546U

CN202578546U - Gas sealing threaded connection structure of steel pipe

Info

Publication number: CN202578546U
Application number: CN 201220188869
Authority: CN
Inventors: 陆金福
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-04-27
Filing date: 2012-04-27
Publication date: 2012-12-05
Anticipated expiration: 2022-04-27

Abstract

The utility model relates to a gas sealing threaded connection structure of a steel pipe. The gas sealing threaded connection structure of the steel pipe comprises a steel pipe factory end, a steel pipe scene end and a coupling, wherein the end parts of the steel pipe factory end and the steel pipe scene end are processed with male threads, two ends of the coupling are processed with female threads which are matched with the male threads, the parameter of the male threads is completely accordant with an API (American Petroleum Institute) standard, the thread form, the conical degree, the thread pitch and the close pitch of the female threads are accordant with the API standard, and the axial middle part of the inner wall of the coupling is provided with a bulge loop. According to the gas sealing threaded connection structure disclosed by the utility model, the API standard thread is adopted, and the processing is simple; the middle part of the coupling is provided with the bulge loop, and thus the connection sealing performance can be increased; and the bulge loop is integrally formed on the coupling and cannot fall off, and the safety is high.

Description

The hermetic seal screw connection structure of steel pipe

Technical field

The utility model relates to the screw connection structure of the oil pipe, sleeve pipe or the line pipe that use in the oil field, specifically a kind of hermetic seal screw connection structure of steel pipe.

Background technology

At present, the method for attachment of known oil pipe, sleeve pipe or line pipe (general designation steel pipe) has following three kinds:

1, the API standard thread connects.As shown in Figure 1, box cupling 3 holds 1 to be connected through API (American Petroleum Institute (API)) standard thread the on-the-spot end 2 of steel pipe and steel pipe factory.The API standard thread is divided into round thread and buttress thread, and clearly the male thread small end end face 5 of the on-the-spot end 2 of regulation steel pipe and steel pipe factory hold 1 male thread small end end face 5 not run into to contact in their connection, and the API standard is controlled with the J value.The combination property that the API standard thread connects is poor, only is applicable to general liquid seal occasion.

2, special thread connects.In order to improve the comprehensive switching performance of steel pipe; Like sealing performance, bonding strength, torque resistant performance and bending resistance etc.; As shown in Figure 2; The on-the-spot end 2 of box cupling 3 and steel pipe and steel pipe factory end 1 are connected through special thread, and male thread small end end face 5 and the steel pipe factory that a torque resistant step separates the on-the-spot end 2 of steel pipe is set in the centre of box cupling 3 holds 1 male thread small end end face 5.Special thread connects and can be used for high hermetic seal occasion, but owing to adopt the centre of special thread and box cupling 3 to also have an outstanding torque resistant step, processing technology is complicated, and processing cost is high.

3, half special thread connects.As shown in Figure 3; The on-the-spot end 2 of box cupling 3 and steel pipe and steel pipe factory end 1 are connected through API round thread or API buttress thread, and hold 2 male thread small end end face 5 and steel pipe factory to hold between 1 the male thread small end end face 5 to separate with a pad 4 in that steel pipe is on-the-spot.Half special thread connects the switching performance raising little, can be used for low hermetic seal occasion, the loss but intermediate washer comes off easily, and safety is not enough.

The utility model content

The utility model provides a kind of hermetic seal screw connection structure of steel pipe to the problems referred to above, and this syndeton processing is simple, cost is low, safe and reliable.

Technical scheme according to the utility model: a kind of hermetic seal screw connection structure of steel pipe; Comprise steel pipe factory end, the on-the-spot end of steel pipe and box cupling; The end of said steel pipe factory's end and the on-the-spot end of said steel pipe is processed with male thread; The two ends of said box cupling are processed with the box thread that matches with said male thread; The parameter of said male thread meets the API standard thread fully, and the tooth form of said box thread, tapering, pitch and standoff meet the API standard, and the axial middle part of said box cupling inwall is provided with bulge loop.

Said bulge loop is one-body molded on said box cupling.

The endoporus aperture of said bulge loop is more than or equal to the endoporus aperture of said steel pipe factory end or the endoporus aperture of the on-the-spot end of said steel pipe.

The technique effect of the utility model is: the utility model adopts the API standard thread, and processing is simple; Middle part at box cupling is provided with bulge loop, can improve the sealing performance of connection; Bulge loop is one-body molded on box cupling, can not come off, and is safe.

Description of drawings

Fig. 1 is the structural representation that existing API standard thread connects.

Fig. 2 is the structural representation that existing special thread connects.

Fig. 3 is the structural representation that existing half special thread connects.

Fig. 4 is the structural representation of the utility model.

The specific embodiment

Be further described below in conjunction with the specific embodiment of accompanying drawing the utility model.

Among Fig. 1 ~ Fig. 4, comprise steel pipe factory end 1, steel pipe scene end 2, box cupling 3, pad 4, male thread small end end face 5, bulge loop 6 etc.

As shown in Figure 4, the utility model is a kind of hermetic seal screw connection structure of steel pipe, comprises steel pipe factory end 1, the on-the-spot end 2 of steel pipe and box cupling 3.The end of steel pipe factory end 1 and the on-the-spot end 2 of steel pipe is processed with male thread; The two ends of box cupling 3 are processed with the box thread that matches with male thread; The parameter of male thread meets the API standard thread fully, and the tooth form of box thread, tapering, pitch and standoff meet the API standard.The axial middle part of box cupling 3 inwalls is provided with bulge loop 6, and bulge loop 6 is one-body molded on box cupling 3.The endoporus aperture of bulge loop 6 is more than or equal to the endoporus aperture of steel pipe factory end 1 or the endoporus aperture of the on-the-spot end 2 of steel pipe.

The utility model adopts the API standard thread, and processing is simple; Be provided with bulge loop 6 at the middle part of box cupling 3, can improve the sealing performance of connection; Bulge loop 6 is one-body molded on box cupling 3, can not come off, and is safe.

Claims

1. the hermetic seal screw connection structure of a steel pipe; Comprise steel pipe factory end (1), the on-the-spot end of steel pipe (2) and box cupling (3); The end of the on-the-spot end of said steel pipe factory's end (1) and said steel pipe (2) is processed with male thread; The two ends of said box cupling (3) are processed with the box thread that matches with said male thread; It is characterized in that: the parameter of said male thread meets the API standard thread fully, and the tooth form of said box thread, tapering, pitch and standoff meet the API standard, and the axial middle part of said box cupling (3) inwall is provided with bulge loop (6).

2. according to the hermetic seal screw connection structure of the described steel pipe of claim 1, it is characterized in that: said bulge loop (6) is one-body molded on said box cupling (3).

3. according to the hermetic seal screw connection structure of claim 1 or 2 described steel pipes, it is characterized in that: the endoporus aperture of said bulge loop (6) is more than or equal to the endoporus aperture of said steel pipe factory's end (1) or the endoporus aperture of the on-the-spot end of said steel pipe (2).