CN106703712A

CN106703712A - Seal connecting pipe joint

Info

Publication number: CN106703712A
Application number: CN201611071953.2A
Authority: CN
Inventors: 沈金章
Original assignee: Wuxi Jinding Oil Pipe Fittings Co Ltd
Current assignee: Wuxi Jinding Oil Pipe Fittings Co Ltd
Priority date: 2016-11-29
Filing date: 2016-11-29
Publication date: 2017-05-24

Abstract

The invention discloses a seal connecting pipe joint which comprises a female joint body and a male joint body. An inner thread is formed in the inner circumferential surface of the female joint body, a female joint body second shoulder and a female joint body first shoulder are sequentially arranged on the portion, corresponding to the inner thread, of the front end of the female joint body, an outer thread is correspondingly formed in the male joint body, and the inner thread and the outer thread are both cylindrical threads; the portions, corresponding to the thread connecting portion, of the back end of the contact surface of the female joint body and the male joint body are provided with an oil storage tool withdrawl groove and a sealing surface, the sealing surface is formed in the mode that a first conical surface on the inner wall of the female joint body makes contact with a spherical surface and a second conical surface on the outer wall of the male joint body in an extruding mode separately, and the spherical surface is connected with the second conical surface. According to the seal connecting pipe joint, not only is the leakproofness well guaranteed, but also thread sticking is avoided, the sealing surface is arranged in the middle, the sealing effect is good, the connector is not likely to be damaged, the threads can be protected, stress concentration is effectively avoided, and the overall service life of the product is prolonged.

Description

One kind is tightly connected pipe joint

Technical field

The invention belongs to oil pipes technical field, more particularly to one kind is tightly connected pipe joint.

Background technology

Petroleum gas is the valuable source of the mankind, and in petroleum gas transport, the sealing for improving pipe is proposed Requirement higher, while using interference fit, there is Thread-sticking in fragile screw thread, these are all to the bonding strength of screw thread It is proposed very high request.

The content of the invention

In order to solve the above technical problems, the present invention provides one kind is tightly connected pipe joint, including female joint and male joint, institute State female joint inner peripheral surface and be machined with internal thread, the front end corresponding to the internal thread in female joint is sequentially provided with female joint the Two shoulders, female joint first shoulder, are correspondingly provided with external screw thread in the male joint, the internal thread is cylinder spiral shell with external screw thread The rear end for corresponding to threaded joints on the contact surface of line, the female joint and male joint is provided with oil storage escape, sealing surface, institute State sealing surface and mutually extruded with second conical surface with the spherical on male joint outer wall respectively by first conical surface on female joint inwall and contact Formed, the spherical is mutually connected with second conical surface, the taper of first conical surface is 1/12-1/16；Second conical surface Taper is 1/6-1/8, the corresponding 30~50mm of radius of spherical, and link position of the male joint 1 with female joint 2 inside is The shoulder of male joint second, the shoulder of the male joint second is circular conical surface, tilted to tube wall, forms the annular cone angle of an introversion, The female joint is mutually connected in plane, the male joint and the female joint interference fit with the second shoulder of the male joint 7.

Preferably, a transition conical surface is formed between second conical surface and the shoulder of male joint second.

Preferably, male joint first shoulder, the male joint are mutually connected in the female joint first shoulder

A circle circular groove is provided with the root of one shoulder.

A circle circular groove is provided with the root of the male joint first shoulder, by setting circular groove it is possible to prevente effectively from stress collection In, improve product whole service life.

Sealing structure is using two-stage sealing structure, i.e. first conical surface to spherical and first conical surface to the close of second conical surface Envelope design form, the taper of the taper less than second conical surface of first conical surface, forms the conical surface and the conical surface, and the conical surface is crowded with spherical The form of press contacts, sealing effectiveness is fine, and sealing station is away from torque shoulder, with sealed reliable, prevents sealing face damage Feature；

First conical surface and spherical make sealing structure in the case where tensile load is acted on by extruding, keep seal contact pressure and length Degree；First conical surface and second conical surface make sealing structure in the case where compressive load is acted on by extruding, keep seal contact pressure；Oil storage The function of escape is for the unnecessary thread compound of storage and makes internal thread machining withdrawing.

Intermediate incline and mesospore inclined-plane are formed to the inclined annular cone angle in middle part so that connection end and inboard wall of tube body Form metal interference to coordinate, connection sealing is effectively ensured.

The present invention is tightly connected pipe joint and both preferably ensure that sealing, in preventing Thread-sticking, sealing surface to be located at again Between, good sealing effect is also less prone to be damaged in interface, can protect screw thread, is prevented effectively from stress concentration, and improving product integrally makes Use the life-span.

Brief description of the drawings

Further illustrate with reference to the accompanying drawings and detailed description：

Fig. 1 is a kind of structural representation for being tightly connected pipe joint of the embodiment of the present invention.

Specific embodiment

Embodiment 1

As shown in figure 1, one kind is tightly connected pipe joint, including female joint 2 and male joint 1, the processing of the inner peripheral surface of the female joint 2 There is internal thread, the front end corresponding to the internal thread in female joint 2 is sequentially provided with the second shoulder of female joint 3, female joint first Shoulder 10, is correspondingly provided with external screw thread in the male joint 1, the internal thread is cylindrical thread, the female joint 2 with external screw thread Oil storage escape 4, sealing surface 5, the sealing surface 5 are provided with the rear end on the contact surface of male joint 1 corresponding to threaded joints Mutually extrude to contact with second conical surface 5 with the spherical 11 on male joint outer wall respectively by first conical surface on female joint inwall and formed, The spherical 11 is mutually connected with second conical surface 5, and the taper of first conical surface is 1/12-1/16；The cone of second conical surface It is 1/6-1/8 to spend, the corresponding 30~50mm of radius of spherical, and the male joint 1 is public affairs with the link position inside of female joint 2 The second shoulder of joint 7, the shoulder of the male joint second is circular conical surface, tilted to tube wall, forms the annular cone angle 6 of an introversion, The female joint is mutually connected in plane, the male joint and the female joint interference fit with the second shoulder of the male joint 7.

A transition conical surface 8 is formed between second conical surface 5 and the second shoulder of male joint 7.

Male joint first shoulder is mutually connected in the female joint first shoulder 10, at the root of the male joint first shoulder It is provided with a circle circular groove 12.

Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, Although being described in detail to the present invention with reference to the foregoing embodiments, for a person skilled in the art, it still may be used Modified with to the technical scheme described in foregoing embodiments, or equivalent is carried out to which part technical characteristic. All any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., should be included in of the invention Within protection domain.

Claims

1. one kind is tightly connected pipe joint, including female joint（2）And male joint（1）, the female joint（2）Inner peripheral surface is machined with Internal thread, in female joint（2）The upper front end corresponding to the internal thread is sequentially provided with the shoulder of female joint second（3）, female joint One shoulder（10）, the male joint（1）On be correspondingly provided with external screw thread, the internal thread is cylindrical thread with external screw thread, described Female joint（2）With male joint（1）Contact surface on correspond to threaded joints rear end be provided with oil storage escape（4）And sealing Face, the sealing surface by first conical surface on female joint inwall respectively with male joint outer wall on spherical（11）With second conical surface （5）Mutually extruding contact is formed, the spherical（11）With second conical surface（5）Mutually it is connected, the taper of first conical surface is 1/12- 1/16；The taper of second conical surface is 1/6-1/8, the corresponding 30~50mm of radius of spherical, the male joint（1）Connect with mother Head（2）Link position inside is the shoulder of male joint second（7）, the shoulder of the male joint second（7）It is circular conical surface, to tube wall It is tilted, form the annular cone angle of an introversion（6）, the female joint（2）With the shoulder of the male joint second（7）Mutually it is connected in flat Face, the male joint（1）With the female joint（2）Interference fit.

It is 2. according to claim 1 to be tightly connected pipe joint, it is characterised in that：In second conical surface（5）With male joint second Shoulder（7）Between be formed with a transition conical surface（8）.

3. according to the anti-Thread-sticking tool joint described in claim 1, it is characterised in that：With the female joint first shoulder （10）Male joint first shoulder is mutually connected in, a circle circular groove is provided with the root of the male joint first shoulder（12）.