Rotatable union sealing joint

Abstract

The utility model belongs to the technical field of union joints, and particularly relates to a rotatable union sealing joint. The union joint comprises a male union end and a female union end which are in socket joint through end faces, bearings are respectively sleeved outside the male union end and the female union end, the bearings are respectively connected with a union nut through external threads, baffle rings are respectively arranged at two ends of the union nut, and one end of each baffle ring is matched with a baffle table of the male union end or the female union end for limiting. The other end of the baffle ring penetrates through the screw rod and is screwed with a screw hole in the side part of the union nut, rotating structures and sealing structures are arranged on the contact surface of the baffle ring and the baffle table and the socket butt joint end surface, and each rotating structure comprises an annular clamping groove and a plurality of balls arranged in the annular clamping groove; the sealing structure comprises an annular sliding groove and an annular sliding block, and a sealing ring is arranged at the bottom of the annular sliding groove. The union joint with the novel structure has the characteristics that the joint ports rotate relatively and flexibly, the butt joint structure is high in strength, and the ports are self-sealed after being detached.

Description

Technical Field

[0001] The utility model belongs to the technical field of union joints, and specifically relates to a rotatable union sealing 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] The existing union joint has a relatively simple structure, generally including a male union end and a female union end that are connected to each other, and the outside of the joint is screwed and fixed by a union nut. After the union joint is installed and positioned, the male end and the female end are locked by the external nut plate and cannot rotate with each other, which limits the scope of use of the union and cannot meet the needs of pipeline rotation under specific conditions; secondly, the internal connection strength of the union joint is low and lacks long-term and stable sealing. After long-term use, it is easy to leak and disconnect. Problems; thirdly, when the union joint is disassembled and repaired, the pipeline of the male and female union ends will contain residual conveying media, and the joint is easily overflowed or sprayed when it is disassembled, especially under the conditions of oil well use, which is easy to cause environmental pollution and other hazards. Utility Model Content

[0004] The utility model aims to provide a new type of union joint structure, which has the characteristics of flexible relative rotation of the joint ports, high strength of the butt joint structure and self-sealing of the disassembled ports.

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

[0006] A rotatable union sealing joint, characterized in that it comprises a union male end and a union female end connected by end faces with sockets, bearings are respectively mounted on the outside of the two ends, the bearings are respectively connected to the union nuts by external threads, retaining rings are respectively arranged at both ends of the union nut, one end of the retaining ring cooperates with the retaining platform of the union male end or the union female end to limit the position, and the other end thereof passes through a screw rod and is tightened with a screw hole on the side of the union nut, a rotating structure and a sealing structure are arranged on the contact surface between the retaining ring and the retaining platform and the end face of the socket connection, wherein the rotating structure comprises an annular groove and a plurality of ball bearings placed in the annular groove; the sealing structure comprises an annular slide groove and an annular slider, and a sealing ring is arranged at the bottom of the annular slide groove.

[0007] Additional technical features constituting the above-mentioned rotatable union sealing joint also include:

[0008] The annular groove is a curved groove, and there are two of them, which are symmetrically arranged on the socket end faces of the male end of the union and the female end of the union or on both sides of the contact surface between the retaining ring and the retaining platform, and the ball is placed between the curved grooves;

[0009] The annular groove includes a positioning ring, a plurality of through holes are arranged on the surface of the ring body of the positioning ring, the balls are respectively placed in the through holes, and the diameter of the balls is not less than the depth of the annular groove;

[0010] ——The male end of the union and its bearing, as well as the female end of the union and its bearing are connected via sealing sleeves;

[0011] The sealing sleeve is fixedly arranged on the outside of the male end of the union or the female end of the union or fixedly arranged on the inner side of the bearing, and the sealing sleeve is fixed by bonding or by an annular groove;

[0012] The bearing is a sealed bearing, in which a plurality of circles of bearing balls are arranged axially, a positioning cylinder is arranged in the bearing, a plurality of through holes are arranged on the surface of the positioning cylinder, and the bearing balls are respectively placed in the through holes;

[0013] ——Sealing washers are arranged between the retaining ring and the end of the union nut, and between the retaining ring and the retaining platform; a sealing gasket layer is arranged between the inner side of the union nut and the bearing;

[0014] ——A one-way valve is arranged inside the male end of the union and / or the female end of the union, and the one-way valve includes a valve seat and a valve stem. The valve seat is provided with an entry hole, and the rear end of the entry hole is a conical expansion. The conical valve head at the end of the valve stem cooperates with the conical expansion. The valve stem is movably placed in a guide hole in the middle of the bracket. A pre-stress spring is mounted on the valve stem, and the pre-stress spring is placed between the conical valve head and the bracket. The bracket includes an annular plate, and a liquid hole groove is arranged on the edge of the annular plate.

[0015] Compared with the prior art, the rotatable union sealing joint provided by the utility model has the following advantages: the union male end and the union female end of the union joint are externally connected to the union nut through bearings, the two ends of the union nut are respectively limited by the retaining ring and the retaining platform of the union male end and the union female end, and the rotating structure and the sealing structure are arranged between the end face of the socket joint, the retaining ring and the retaining platform, so as to achieve the effect of internal connection sealing and relative rotation of the docking port, meet various use conditions of the union joint, and improve the application scope of the union sealing joint; secondly, the rotating structure includes an annular groove and a plurality of balls arranged in the annular groove, and the balls are arranged in the annular groove, so that the contact surfaces between the docking end face, the retaining ring and the retaining platform can slide smoothly with each other, the friction loss is small, and the mutual rotation is flexible; the sealing structure includes an annular groove and an annular slider, and a sealing ring is arranged at the bottom of the annular groove, that is, the annular slider is placed in the annular groove for rotation, and the sealing ring at the bottom of the annular groove is pressed by the annular slider to achieve a dynamic sealing effect, and the structure improves the connection strength and the long-term stability of the seal, and has the advantages of simple and compact structure, convenient use, safety and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of a rotatable union sealing joint. DETAILED DESCRIPTION

[0017] The structure and working principle of the rotatable union seal joint 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 the embodiments. 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.

[0018] In the description of the present invention, unless otherwise specified, the terms "inside / outside", "front / back", "top / bottom", etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They 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.

[0019] 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.

[0020] like Figure 1 As shown, the structure of the rotatable union sealing joint comprises a union male end 11 and a union female end 12 which are butt-jointed through an end face a, and bearings (21, 22) are respectively mounted on the outside of the two ends, and the bearings (21, 22) are respectively connected to the union nut 4 through an external thread 3, and retaining rings 51 are respectively arranged at both ends of the union nut 4, one end of the retaining ring 51 cooperates with the retaining platform 52 of the union male end 11 or the union female end 12 to limit the position, and the other end thereof penetrates the screw rod 50 and is screwed tightly with the screw hole on the side of the union nut 4, and the end face a of the butt-jointed socket and the contact surface b of the retaining ring 51 and the retaining platform 52 are all provided with a rotating structure and a sealing structure, wherein the rotating structure comprises an annular groove (61, 61') and a plurality of balls (62, 62') disposed in the annular groove (61, 61'); the sealing structure comprises an annular slide groove (71, 71') and an annular slider (72, 72'), and a sealing ring (73, 73') is arranged at the bottom of the annular slide groove (71, 71').

[0021] The working principle is as follows: the male end 11 and the female end 12 of the new union joint are butted together through the end face a, and the two are externally provided with bearings (21, 22) and connected with the union nut 4 through the external thread 3, that is, the male and female ends of the union can rotate relative to the union nut 4; retaining rings 51 are respectively arranged at both ends of the union nut 4, one end of the retaining ring 51 cooperates with the retaining platform 52 of the male end 11 or the female end 12 of the union to limit the position, and the other end thereof passes through the screw rod 50 and is screwed tightly with the screw hole on the side of the union nut 4, that is, the union nut 4 cooperates with the retaining platforms 52 of the two ends of the union through the retaining rings 51 at both ends, and is positioned and locked in the axial direction to prevent the male end 11 of the union from being separated from the female end 12 after being butted together;

[0022] In order to realize the relative rotation of the male end 11 of the union and the female end 12 of the union, a rotating structure and a sealing structure are arranged on the end face a of the socket joint and the contact surface b of the retaining ring 51 and the retaining platform 52. The specific structure is that the rotating structure includes an annular groove (61, 61') and a plurality of balls (62, 62') arranged in the annular groove (61, 61'), that is, when the male and female ends of the butt joint union rotate relative to each other, the balls (62, 62') rotate in the annular groove (61, 61'), thereby reducing friction loss and making the rotation smooth and flexible; the sealing structure includes an annular groove (61, 61') and a plurality of balls (62, 62') arranged in the annular groove (61, 61'). The annular slide groove (71, 71') and the annular slider (72, 72') are provided with a sealing ring (73, 73') at the bottom of the annular slide groove (71, 71'), that is, the annular slide groove (71, 71') and the annular slider (72, 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, 73') is laid in the groove and positioned snugly. The annular slider (72, 72') presses the sealing ring (73, 73') to rotate in the annular slide groove (71, 71') to realize dynamic sealing, and the sealing effect is long-lasting and stable.

[0023] In the structure constituting the above-mentioned rotatable union sealing joint,

[0024] The annular grooves (61, 61') are arcuate grooves, two of which are symmetrically arranged on the socket end faces a of the male end 11 and the female end 12 or on both sides of the contact face b between the retaining ring 51 and the retaining platform 52, that is, the arcuate grooves facilitate the positioning of the annular balls (62, 62') and also facilitate the rotation of the balls (62, 62') in the annular direction. The balls (62, 62') are placed between the two opposite arcuate grooves, and their diameter is not less than the sum of the depths of the two arcuate grooves;

[0025] ——Preferably, the annular groove (61, 61') includes a positioning ring (63, 63'), a plurality of through holes are evenly arranged on the surface of the ring body of the positioning ring (63, 63') along the annular direction, and the balls (62, 62') are arranged in the through holes; when the annular groove (61, 61') is arranged on one side of the butt end face a and on one side of the contact surface b between the retaining ring 51 and the retaining platform 52, the diameter of the balls (62, 62') is not less than the depth of the annular groove (61, 61'), so that the balls (62, 62') are exposed from the annular groove (61, 61'); when the annular grooves (61, 61') are symmetrically arranged on both sides of the butt end face a and on both sides of the contact surface b between the retaining ring 51 and the retaining platform 52, the diameter of the balls (62, 62') is not less than the sum of the depths of the two annular grooves (61, 61');

[0026] - Further, the male end 11 of the union and its bearing (21, 22), and the female end 12 of the union and its bearing (21, 22) are connected via a sealing sleeve 8, that is, the outer ring of the bearing (21, 22) is threadedly connected and positioned with the inner side of the union nut 4, and the inner ring of the bearing (21, 22) is respectively relatively rotated with the male end 11 of the union and the female end 12 of the union. In order to enhance the sealing performance of the rotating part, the sealing sleeve 8 is pressed and positioned to achieve a dynamic sealing effect;

[0027] - Preferably, the sealing sleeve 8 is fixedly arranged on the outside of the male end 11 or the female end 12 of the union or fixedly arranged on the inner side of the bearing (21, 22), and the sealing sleeve 8 is fixed by bonding or by an annular groove. The sealing sleeve 8 is placed in the groove and is not prone to sliding and dislocation, and the dynamic seal is long-lasting and stable;

[0028] The bearings (21, 22) are sealed bearings (21, 22), and a plurality of circles of bearing balls 20 are arranged in the axial direction therein, that is, the bearings (21, 22) are cylindrical, and are mounted on the male end 11 and the female end 12 of the union, and are subjected to balanced rotational force and flexible axial rotation. A positioning cylinder 201 is arranged in the bearings (21, 22), and a plurality of through holes are arranged on the surface of the positioning cylinder 201. The bearing balls 20 are respectively placed in the through holes, and the through holes play a role in arranging and positioning the bearing balls 20, so that the positions will not be scattered when the bearings rotate in the circumferential direction;

[0029] - In order to enhance the sealing effect of the union joint, sealing washers are arranged between the retaining ring 51 and the end of the union nut 4, and between the retaining ring 51 and the retaining platform 52, and a sealing cushion layer is arranged between the inner side of the union nut 4 and the bearings (21, 22). The sealing washers and the sealing cushion layer are made of flexible rubber or silicone, and elastic deformation facilitates compression and sealing, and also improves the strength of the threaded connection;

[0030] ——The most preferred embodiment, the above-mentioned union male end 11 and / or the union female end 12 are provided with a one-way valve, the one-way valve comprises a valve seat 91 and a valve stem 92, the valve seat 91 is provided with an entry hole 93, the rear end of the entry hole 93 is a conical expansion 94, the conical valve head 95 at the end of the valve stem 92 cooperates with the conical expansion 94, the valve stem 92 is movably placed in the guide hole 901 in the middle of the bracket 90, the valve stem 92 is fitted with a pre-compression spring 96, the pre-compression spring 96 is placed between the conical valve head 95 and the bracket 90, that is, the conical valve head 95 is pressed into the conical expansion 94 by the pre-compression spring 96, when the union is assembled and docked, The valve seat inlet hole 93 is subjected to the pressure of the conveying medium, pushing the conical valve head 95 and opening the conical expansion port 94, thereby realizing the conveying connection of the interface; when the union is repaired and disassembled, the conveying in the pipeline is stopped, the internal pressure drops, and the pre-compression spring 96 presses the conical valve head 95 on the conical expansion port 94 again to realize the closure of the valve seat inlet hole 93, so that the union ports are in a self-sealing state, avoiding the overflow of the residual conveying medium inside. The above-mentioned bracket 90 includes an annular plate, and a liquid hole groove 902 is arranged on the edge of the annular plate, which increases the flow rate and flow of the conveying medium in the union and improves the conveying efficiency of the union.

[0031] 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 rotatable union sealing joint, characterized in that: It comprises a male union and a female union which are butted together through end faces with sockets, and bearings are respectively mounted on the outside of the two unions, and the bearings are respectively connected to the union nuts through external threads, and retaining rings are respectively arranged at both ends of the union nut, and one end of the retaining ring cooperates with the retaining platform of the male union or the female union to limit the position, and the other end thereof passes through the screw rod and is tightened with the screw hole on the side of the union nut, and the contact surface between the retaining ring and the retaining platform and the end face of the socket-jointed connection are both provided with a rotating structure and a sealing structure, wherein the rotating structure comprises an annular groove and a plurality of ball bearings arranged in the annular groove; the sealing structure comprises an annular slide groove and an annular slider, and a sealing ring is arranged at the bottom of the annular slide groove.

2. A rotatable union sealing joint according to claim 1, characterized in that: The annular groove is an arc groove, and there are two of them, which are symmetrically arranged on the socket end faces of the male end of the union and the female end of the union or on both sides of the contact surface between the retaining ring and the retaining platform, and the ball is placed between the arc grooves.

3. The rotatable union sealing joint according to claim 1, characterized in that: The annular groove comprises a positioning ring, a plurality of through holes are arranged on the surface of the ring body of the positioning ring, the balls are respectively placed in the through holes, and the diameter of the balls is not less than the depth of the annular groove.

4. The rotatable union sealing joint according to claim 1, characterized in that: The male end of the union and its bearing, as well as the female end of the union and its bearing are connected via sealing sleeves.

5. The rotatable union sealing joint according to claim 4, characterized in that: The sealing sleeve is fixedly arranged on the outside of the male end of the union or the female end of the union or fixedly arranged on the inner side of the bearing, and the sealing sleeve is fixed by bonding or by an annular embedding groove.

6. The rotatable union sealing joint according to claim 1, characterized in that: The bearing is a sealed bearing, in which a plurality of circles of bearing balls are arranged axially. A positioning cylinder is arranged in the bearing, and a plurality of through holes are arranged on the surface of the positioning cylinder. The bearing balls are respectively placed in the through holes.

7. The rotatable union sealing joint according to claim 1, characterized in that: Sealing washers are arranged between the retaining ring and the end of the union nut, and between the retaining ring and the retaining platform; and a sealing pad layer is arranged between the inner side of the union nut and the bearing.

8. The rotatable union sealing joint according to claim 1, characterized in that: A one-way valve is arranged inside the male end of the union and / or the female end of the union, and the one-way valve includes a valve seat and a valve stem. The valve seat is provided with an entry hole, and the rear end of the entry hole is a conical expansion. The conical valve head at the end of the valve stem cooperates with the conical expansion, and the valve stem is movably placed in a guide hole in the middle of the bracket. A pre-stress spring is mounted on the valve stem, and the pre-stress spring is placed between the conical valve head and the bracket.

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