RU2682800C2 - Quick-release slip universal joint - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: invention relates to the connection of the quick-release spline universal, intended for use both for the fixed connection of equipment to each other, and with the transmission of torque to the left and right, or to connect equipment to the tubing or to flexible tubing pipes (FTP) with the possibility of passage of the medium inside the connection without loss and pressure reduction in the tubing or FTP. Quick-release slip universal joint consists of a coupling and nipple, one end thereof contains elements for interconnection thereof it further comprises a latch to prevent axial movement and separation of the nipple and coupling, where the coupling body is made with a three-stage internal through-passage hole, and the nipple body has an end mating (corresponding to) shape and size with a through hole, the elements for interconnection thereof are made in the form of slots and teeth, with the slots and coupling teeth located on the inner diameter of the largest stage, and the nipple is at the middle stage, the inner surface of the middle stage of the coupling and the outer surface of the nipple end are made with grooves that form an annular channel with access to the outside in the form of a stepped hole with internal thread for the installation of a clamp, made in the form of a flexible ring element, one end thereof is provided with a threaded element for fixing in the coupling housing.EFFECT: invention provides for creating a quick-release, sealed joint, having the ability to transfer torque both to the left and to the right without the risk of latching a tool and not requiring a special tool for assembly and disassembly.5 cl, 4 dwg

Description

The present invention relates to the oil and gas industry, in particular to a universal quick coupler “SHLIRS” connection, intended for use both for stationary connection of equipment to each other and for transmitting torque left and right, as well as for connecting equipment to tubing ( Tubing) or flexible tubing (CT) with the possibility of passage of the medium inside the connection without loss and without lowering the pressure in the tubing or CT.

Known quick-disconnect pipe connection containing a sleeve mounted on the ends of the connected pipes, o-rings and locking stops (see the description of the utility model to the patent of the Russian Federation No. 63017, IPC F16L 37/00, publ. 10.05 2007).

The coupling is cylindrical. Grooves are made on the inner surface of the coupling for installing the sealing rings, and the locking stops are eccentric and mounted on the outer surface of the coupling at both ends of the coupling with the possibility of interaction with the outer surface of the connected pipes. After installing the coupling with the sealing rings on the pipes to be connected, the eccentric stops tightly press against the outer surface of the pipes by rotation around the axes, which eliminates the possibility of displacement of the connected elements relative to each other. However, the known compound cannot be used in the oil and gas industry when running pipes into the casing of the well, as it is not able to withstand axial (tensile loads). In addition, it does not have the ability to transmit torque to the left and right, and the outer diameter of the connected pipes has protruding elements in the form of eccentric stops, which does not satisfy the operating conditions in the oil and gas industry.

A quick-disconnect connection is known, including a pair of bushings with an internal thread for connection with pipes, a seal and a fixing element (see utility model description to RF patent No. 62201, IPC F16L 19/00, published on March 27, 2007). One connection sleeve is made with flats on the outer surface of the key and with an internal tapered thread and has an annular radial protrusion formed by thickening at its end. The end face of the thickening on the outer surface is processed under a cone, on the surface of which an annular groove for sealing in the form of a rubber ring is made. The other sleeve is also made with flats on the outer surface and with an internal tapered thread, at one end it has a bulge along the end of which an inner cone is made, and a thread is made along the outer diameter to install the fixing element in the form of a union nut.

A disadvantage of the known connection is that it cannot be used in the oil and gas industry when running pipes into the casing of the well, since it does not have the ability to transmit torque to the left and right, and the outer diameter has protruding elements in the form of ebbs on the nut, which makes it impossible to run into the well.

Known quick-detachable threaded connection, including male and female pipes with tapered threads (see the description of the utility model for patent No. 126419, IPC E212B 17/042, publ. 04.23.2013).

The cross-sectional profile of tapered threads is an isosceles trapezoid, moreover, the male pipe has a conical stop face, and the female pipe has a conical stop ledge interacting with it. In addition, the male pipe has a conical thrust shoulder, and the female pipe has a conical thrust end interacting with it. The fixing of the pipes between themselves is ensured by the fact that each conical thread is made with a taper of 1: 37.37 and has a pitch of 12.7 mm.

The disadvantages of the castle connection tubing connection:

- the ability to transmit torque only in one direction, namely clockwise (right-hand thread) or counterclockwise (left-hand thread);

- when tightening the lock connection, it is necessary to apply certain efforts, using, as a rule, special keys;

- lock connections do not have protection against spontaneous disconnection.

Known for the locking connection of tubing adopted as a prototype, consisting of a coupling and a nipple, at one end of which elements are made for their mutual connection (see the description of the utility model for patent No. 126419, IPC F16L 15/08, publ. 27.03. 2013).

Elements for their mutual connection are connecting threads of increased length without forced run-off with a conical threaded groove on the nipple, the initial diameter of which exceeds the diameter of the troughs of the thread in this section, while the length of the connecting thread allows the nipple to freely enter the coupling without rotation by at least 13 mm.

The disadvantages of a threaded connection include:

- the ability to transmit torque only in one direction, namely clockwise (right-hand thread) or counterclockwise (left-hand thread);

- when twisting the threaded connections, it is necessary to apply certain efforts, using, as a rule, special keys;

- threaded connections do not have protection against spontaneous disconnection.

The technical task and the technical result of the present invention is the creation of a quick-disconnect tight connection that can transmit torque both to the left and to the right without the risk of turning the tool and does not require a special tool (mechanical, hydraulic wrenches or detectors, vice) to assemble and disassemble the connection.

The technical result is achieved in that the universal quick-release joint, consisting of a coupling and a nipple, one end of which contains elements for their mutual connection, is characterized in that it further comprises a latch to prevent axial movement and separation of the nipple and the coupling, where the coupling body is made with a three-stage internal through passage, and the nipple body has a mating (corresponding) shape and size end with a through hole, while the elements for their mutual the joints are made in the form of splines and teeth, and the splines and teeth of the coupling are located on the inner diameter of the largest stage, and the nipple is on the middle stage, the inner surface of the middle stage of the coupling and the outer surface of the end of the nipple are made with grooves that form an annular channel with an exit to the outside in the form of a step openings with an internal thread for mounting the latch, made in the form of a flexible ring element, one end of which is equipped with a threaded element for fixing in the coupling body. Slots and teeth of the working thread can be made with a straight-sided, involute or triangular profile. The latch can be made in the form of a flexible annular element with balls strung on it.

The advantages of connecting a universal quick-release splice are that it:

- has insignificant dimensions;

- provides torque transmission both to the left and to the right, and completely eliminates spontaneous disconnection;

- can perceive axial tensile loads;

- provides high tightness;

- provides high resistance to aggressive environments on the sealing seal;

- provides the possibility of operation with a pressure drop of up to 700 atmospheres and a temperature of up to 175 ° C;

- possesses high vibration resistance;

- possesses high resistance to explosive loads;

- provided without special keys and without much effort;

- does not require a special tool during assembly and disassembly (mechanical, hydraulic wrenches or breakers, vice);

- reduces the risk of extraneous fasteners getting into the well during equipment installation;

- withstands high torque, which allows you to use it in the layouts for drilling and milling;

- has a long service life before repair

but restoration work. The quick disconnect tight spline connection, universal "SHLIRS" is illustrated by drawings, where: in FIG. 1 shows a cross section of a General view of the coupling; in FIG. 2 - section of a General view of the nipple; in FIG. 3 is a general view of the assembly assembly; in FIG. 4 is a section along the locking element.

The universal quick-release splined connection contains a male element - a shaft 1 (nipple) and a female element - a hole 2 (coupling), the working ends of which are made with slots 3 and teeth 4 for their interaction, ensuring the alignment of the nipple 1 and the coupling 2, as well as contact between are persistent end surfaces (persistent end surfaces are not shown in the drawing). Elements for connecting the splines 3 and teeth 4 can be made either directly on the connected parts of the equipment, as well as on the connected tubing or flexible tubing (CT), or on individual parts forming sub assemblies.

Slots 3 and teeth 4 may have a different shape, for example straight, involute or triangular. The diameters of the connection can also be different, depending on the place of use. The housing of the clutch 2 is made with a three-stage internal through-hole, while the slots 3 and teeth 4 are located on the inner diameter of the largest stage. The body of the nipple 1 has an end mating (corresponding) in shape and size to the middle and large stages of the coupling 2 and also has a through hole and slots 3 and teeth 4 located on the outer surface of the middle stage of the nipple 1.

The inner surface of the middle stage of the coupling 2 and the outer surface of the end of the nipple 1 is made with a groove 5 and 6, respectively, located in the perpendicular axis of the coupling 2 and the nipple 1 of the plane, forming an annular channel when collecting the connection to the outside in the form of a stepped hole 7 with internal thread for installation retainer. The latch is made in the form of a flexible shaft 8 (cable) with a head 9 threaded on the outer surface and mating with a stepped hole 7.

The latch can be made in the form of a cable 8, on which balls 10 are strung through holes with the possibility of rotation relative to the axis of the cable (holes are not shown in the drawing). One end of the cable 8 is rigidly fixed by welding to the head 9 (screw) and the opposite end of the cable 8 is equipped with a stop 11 for fixing the balls 10 on the cable 8. The fixing element has great strength and is flexible. The axis of the cable 8 is able to take the trajectory of the circumference of the annular channel.

To ensure the tightness of the connection on both sides of the grooves 5 and 6, grooves are made for installing sealing lips 12 and 13, respectively, capable of withstanding pressure up to 100 MPa (grooves not shown in the drawing).

The proposed compound is collected as follows.

First, the sealing collars 12 and 13 are placed in the grooves 5 and 6, the slots 3 and the teeth 4 of the coupling 2 are combined with the teeth 4 and the grooves 3 of the nipple 1 and the nipple 1 is moved inside the coupling 2 until the grooves 5 and 6 are aligned. Then, an outlet of the formed annular channel is installed the latch, fixing the head 9 in the stepped hole 7 of the clutch housing 2. The latch prevents axial movement and separation of the nipple 1 and the clutch 2.

The connection has great strength, tightness and the ability to absorb axial tensile loads.

The connection has the ability to operate both in a stationary state when connecting equipment to pipes, and with the transmission of torque both to the left and to the right and completely eliminates spontaneous disconnection.

Claims (5)

1. A universal quick-release splined connection consisting of a coupling and a nipple, one end of which contains elements for their mutual connection, characterized in that it further comprises a latch to prevent axial movement and separation of the nipple and the coupling, where the coupling body is made with a three-stage internal through passage hole, and the nipple body has a mating (corresponding) in shape and size end with a through hole, while the elements for their mutual connection are made in the form of splines and beats, and the splines and teeth of the coupling are located on the inner diameter of the largest stage, and the nipples are on the middle stage, the inner surface of the middle stage of the coupling and the outer surface of the end of the nipple are grooves that form an annular channel with an exit to the outside in the form of a stepped hole with internal thread for installation a latch made in the form of a flexible ring element, one end of which is equipped with a threaded element for fixing in the coupling body. 2. Connection quick-release slotted universal, according to claim 1, characterized in that the latch is made in the form of a flexible ring element with balls strung on it. 3. The universal quick-release splined connection, according to claim 1 or 2, characterized in that the splines and teeth are made with a straight-line profile. 4. The universal quick-release splined connection, according to claim 1 or 2, characterized in that the splines and teeth are made with an involute profile. 5. The universal quick-release splined connection, according to claim 1 or 2, characterized in that the splines and teeth are made with a triangular profile.

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