Novel union joint

Abstract

The utility model belongs to the technical field of pipeline joints, and particularly relates to a novel union joint. The union joint comprises a male union end and a female union end which are in socket butt joint through conical surfaces, the butt joint area of the male union end and the female union end is connected with a union nut through external threads, the conical surfaces of the male union end and the female union end are respectively provided with a plurality of arc-shaped threads or protruding strips at intervals, and the intervals of the arc-shaped threads or the protruding strips are used for socket feeding of the male union end and the female union end. After the union male end and the union female end rotate mutually, the arc-shaped threads or the protruding strips are clamped and locked, at least one end of the conical face is provided with a socket positioning structure, the socket positioning structure comprises blind holes formed in the union male end and the union female end respectively, and a clamping ball connected with a pre-pressing spring is arranged in one of the blind holes; the novel union joint realizes the effects of firm butt joint of pipe orifices and tight sealing, and also has the characteristics of butt joint locking, drawing resistance, vibration prevention, disconnection prevention and long-acting and stable sealing.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline joints, and specifically relates to a novel union joint. Background Art

[0002] Union joint, also called live joint or pipe joint, is an important pipe fitting that connects two pipelines. It can separate the joint of the two pipes without rotating the pipelines, thus facilitating maintenance work.

[0003] At present, most of the union joints used in oil wells are high-pressure unions, which require the pipeline to be firmly connected and have strong sealing properties. The existing unions generally have a simple structure and are easy to load and unload. However, the female union head and the male union head in the union nut do not have a long-term sealing component with each other, and the sealing performance is poor during use; secondly, the pipeline connection structure has poor stability. When the pipeline transportation pressure changes or the pipeline vibrates or moves, the union joint is prone to leakage or detachment, which reduces the safety performance of the pipeline connection. Utility Model Content

[0004] The utility model aims to provide a new type of union joint with firm butt connection and tight sealing, which has the characteristics of butt connection, locking, anti-pulling, vibration and anti-disconnection, and long-term and stable sealing.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A novel union joint comprises a union male end and a union female end which are butted together by means of a conical surface or a cylindrical surface, wherein the butt region of the two ends is connected to a union nut by means of an external thread, and the characteristic is that: the union male end and the union female end are respectively provided with a plurality of groups of arcuate threads or convex strips discontinuously along the circumferential direction on the conical surface or the cylindrical surface, and the intervals between the adjacent arcuate threads or convex strips in the circumferential direction are provided for the union male end and the union female end to be socket-fed along the conical surface or the cylindrical surface, and the arcuate threads or convex strips are engaged and locked after the two ends are rotated relative to each other, and a socket positioning structure is provided at least at one end of the conical surface or the cylindrical surface, and the socket positioning structure comprises blind holes respectively provided on the union male end and the union female end, and a clamping ball connected to a preload spring is provided inside one of the blind holes.

[0007] Additional technical features constituting the above-mentioned novel union joint include:

[0008] - After the arc-shaped threads or convex strips in the conical surface or cylindrical surface are rotated and locked to position, strips are inserted into the intervals between them, and the strips fit the shape of the conical surface or cylindrical surface;

[0009] - A sealing mechanism is provided on at least one end surface of the conical surface or cylindrical surface, and the sealing mechanism comprises a matching annular groove and annular convex ridge, and a sealing ring is installed at the bottom of the annular groove;

[0010] ——The cross section of the arcuate thread or convex strip in the conical surface or cylindrical surface is in the shape of an inverted tooth, and the conical surface is provided with a rubber cushion or a fiber woven cloth;

[0011] ——A retaining ring is installed at both ends of the union nut, an annular sealing ring is provided on the inner side of the retaining ring, and a plurality of through holes are provided on the retaining ring. Screws are passed through the through holes and are screwed to the threaded holes on the outer steps of the male end of the union or the female end of the union.

[0012] Compared with the prior art, a new type of union joint provided by the utility model has the following advantages: a plurality of groups of arcuate threads or convex strips are respectively intermittently arranged in the circumferential direction in the conical surface or cylindrical surface where the male end and the female end of the union are socketed, and the intervals between the arcuate threads or convex strips are used for the male end and the female end of the union to be socketed and fed in the axial direction. After the sockets are in place, the arcuate threads or convex strips are relatively rotated to engage and position, and the structure is convenient for installation and disassembly, and the threaded clamping connection is relatively reliable and resistant to impact and vibration; secondly, a socket positioning structure is arranged at at least one end of the conical surface or the cylindrical surface, and the socket positioning structure includes blind holes respectively arranged at the male end and the female end of the union, and a clamping ball connected with a preload spring is arranged inside one of the blind holes, and the clamping ball is limitedly engaged in the two blind holes on the socket surface, so that the male end and the female end of the union are not easy to be disjointed after being socketed and positioned, and the utility model has the advantages of simple and compact structure, convenient use, economy and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural schematic diagram of a union joint of the utility model;

[0014] Figure 2 It is a cross-sectional schematic diagram of the socket-jointed connection between the male end of the union and the female end of the union. DETAILED DESCRIPTION

[0015] The structure and working principle of the new union provided by the utility model are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] In the description of the present invention, unless otherwise specified, the terms "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set / provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0018] like Figure 1 As shown, the structure of the novel union joint includes a union male end 1 and a union female end 2 which are butted together through a conical surface a or a cylindrical surface, and the butt region of the two is connected to a union nut 3 through an external thread, and the union male end 1 and the union female end 2 are respectively provided with a plurality of groups of arcuate threads or convex strips 4 intermittently along the circumferential direction on the conical surface a or the cylindrical surface, and the intervals between adjacent arcuate threads or convex strips 4 in the circumferential direction are provided for the union male end 1 and the union female to be plugged in along the conical surface a or the cylindrical surface, and the arcuate threads or convex strips 4 are engaged and locked after the two rotate relative to each other (such as Figure 2 As shown), a socket positioning structure is provided at least at one end of the conical surface a or the cylindrical surface, and the socket positioning structure includes blind holes 51 respectively provided at the male end 1 and the female end 2 of the union, and a clamping ball 53 connected to a preload spring 52 is provided inside one of the blind holes 51.

[0019] The working principle is as follows: the conical surface a or cylindrical surface of the socket-jointed union joint is discontinuously provided with a plurality of groups of arcuate threads or convex strips 4 along the circumferential direction, and the union male end 1 and the union female end 2 can be socket-jointed along the intervals, and then the two rotate relative to each other so that the arcuate threads or convex strips 4 engage with each other, and at least one end of the conical surface a or the cylindrical surface is provided with a blind hole 51 respectively arranged on the union male end 1 and the union female end 2, and a clamping ball 53 connected with a preload spring 52 is arranged inside one of the blind holes 51, that is, after the socket is fed into place, the clamping ball 53 is placed in the upper and lower blind holes 51 at the same time, so that the union male end 1 and the union female end 2 are positioned in the axial direction, and the impact resistance and anti-disconnection performance are further improved.

[0020] It should be noted that the socket positioning structure composed of the blind hole 51 and the locking ball 53 is preferably in the same axial direction as the center of the arcuate thread or convex strip 4, that is, after the socket is inserted to the bottom and rotated relative to each other, the blind hole 51 of the male end 1 and the female end 2 can overlap in position, that is, the locking ball 53 is lifted up and placed in the two blind holes 51 at the same time.

[0021] In the structure constituting the above-mentioned novel union,

[0022] --like Figure 2 As shown, in order to strengthen the socket positioning, the arcuate threads or convex strips 4 in the conical surface a or the cylindrical surface are positioned by mutual rotation and engagement ( Figure 2As shown, at this time, the arc-shaped threads or convex strips 4 of the two overlap in the axial position), and the strip plate 6 is inserted in the interval, and the strip plate 6 fits the shape of the conical surface a or the cylindrical surface, that is, the male end 1 and the female end 2 are mutually engaged and positioned by the threads or convex strips 4 at the socket joint, and are filled by the strip plate 6 at the interval, so that the joint is axially resistant to pulling, and the dislocation and loosening are prevented in the circumferential direction, making the joint structure more reliable;

[0023] ——A sealing mechanism is arranged on at least one end surface of the conical surface a or the cylindrical surface, and the sealing mechanism comprises a matching annular groove 71 and annular convex ridge 72. A sealing ring 73 is installed at the bottom of the annular groove 71, that is, the annular groove 71 and the annular convex ridge 72 are engaged with each other to prevent radial displacement and withstand the impact of the conveying pressure in the pipe. The sealing ring 73 is laid in the groove and positioned well, and the sealing effect is long-lasting and stable;

[0024] ——Preferably, the cross section of the arcuate thread or convex strip 4 in the conical surface a or cylindrical surface is in the shape of an inverted tooth. After the male end 1 and the female end 2 of the union rotate relative to each other, the inverted teeth engage with each other, the axial connection is tighter, and the anti-pulling and anti-disconnection effect is better. A rubber cushion sleeve or fiber woven cloth is laid in the conical surface a. After the inverted teeth are pressed against each other, the contact part of the socket-jointed connection is in a fully sealed state, the union has a long service life, and the sealing durability is good;

[0025] ——Furthermore, retaining rings 81 are respectively installed at both ends of the above-mentioned union nut 3, and an annular sealing ring 82 is provided on the inner side of the retaining ring 81. A plurality of through holes are provided on the retaining ring 81. Screws 83 are provided through the through holes and are tightened with the threaded holes on the outer steps of the union male end 1 or the union female end 2. That is, the connection between the union nut 3 and the union male end 1 or the union female end 2 is strengthened by the screw 83. The union has a high degree of assembly, a strong structural integration, a more secure internal connection, and is resistant to vibration and impact, and high pressure, and is suitable for various use conditions.

[0026] The above-described implementation modes are only used to illustrate the technical solution of the utility model, and are not limiting conditions for the implementation of the utility model. Therefore, any other modifications or equivalent replacements of configuration dimensions and internal structures made to the technical solution of the utility model, as long as they do not depart from the spirit and scope of the technical solution of the utility model, should be included in the scope of the claims of the utility model.

Claims

1. A new type of union joint, comprising a union male end and a union female end connected by a conical surface or a cylindrical surface, and the connecting area of ​​the two is connected to a union nut by an external thread, characterized in that: The male and female ends of the union are respectively provided with a plurality of groups of arcuate threads or convex strips discontinuously along the circumferential direction on the conical surface or the cylindrical surface, and the intervals between the adjacent arcuate threads or convex strips in the circumferential direction are provided for the male and female ends of the union to be plugged in, and the arcuate threads or convex strips are engaged and locked after the two rotate relative to each other, and a socket positioning structure is provided at least at one end of the conical surface or the cylindrical surface, and the socket positioning structure includes blind holes respectively provided at the male and female ends of the union, and a locking ball connected with a preload spring is provided inside one of the blind holes.

2. A new type of union according to claim 1, characterized in that: After the arc-shaped threads or convex strips in the conical surface or cylindrical surface are positioned by mutual rotation and engagement, strip plates are inserted into the intervals thereof, and the strip plates are in conformity with the shape of the conical surface or cylindrical surface.

3. A new type of union according to claim 1, characterized in that: A sealing mechanism is arranged on at least one end surface of the conical surface or the cylindrical surface. The sealing mechanism comprises a matching annular groove and annular convex ridges. A sealing ring is installed at the bottom of the annular groove.

4. A new type of union according to claim 1, characterized in that: The cross section of the arcuate threads or convex strips in the conical surface or cylindrical surface is in the shape of inverted teeth, and the conical surface is provided with a rubber pad or a fiber woven cloth.

5. The novel union according to claim 1, characterized in that: A retaining ring is installed at both ends of the union nut, an annular sealing ring is provided inside the retaining ring, and a plurality of through holes are provided on the retaining ring. Screws are passed through the through holes and are screwed to the threaded holes on the outer steps of the union male end or the union female end.

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