ES2209623A1 - High pressure bypass device, for fluid piping system, has lateral valve connected with inner sides of radial tube and bypass pipe by inner chamber of actuator, for injecting inert gas to check sealing and purge of bypass pipe - Google Patents

Abstract

An actuator provided at the neck of radial tube, comprises feed screw and shaft connected to end-threaded area of the cutter, by male connector and nut. A lateral valve connected with the inner sides of radial tube and bypass pipe by inner chamber of the actuator, injects inert gas to check the sealing and purge of bypass pipe.

Description

Device to make leads under pressure in fluid conduction networks.

Object of the invention

The present invention patent application Its purpose is to register a device to carry out referrals in fluid conduction networks constituted by pipes such as those used for fluid supply, for example water or gas, and that incorporates notable innovations and advantages over current devices and devices for the same or similar end.

More specifically the new invention comprises a T-shaped tap attachable to the distribution pipe by a suitable seat or collar. Said T presents in the radial duct a milling cutter for drilling the pipe and means for its activation and removal in a sealed manner and the extraction outlet is attached to said radial duct of derivative duct fluid. The strawberry comprises means for holding an external tool for handling. Said useful in addition  it allows the verification of the tightness of the branch and the extraction of internal air with an inert gas, useful in the case of derivations of gas transport ducts.

Background of the invention

A market is currently available great variety of bypass devices for the realization of an extraction of a conduit that is under pressure and in service. For example, it is common to use these devices for water and gas supply companies, as it allows to perform network leads or a new customer's pipe connection to the general distribution pipe that is usually It is in service and cannot be used for fluid distribution Some of these devices comprise generally a coupling collar to the pipe and the specific T derivation on it. Said necklace is attached to the pipe by a means of mechanical connection, either screwed directly, by soldier on its surface or glued. On said seats are arranged the T leads, also joined by mechanical means, gluing, welding or fabricated entirely.

These T-leads are constituted by a main conduit that presents its threaded interior in all its length. A cutting tool is attached to said thread, as a trepan, strawberry or similar that has a contour corresponding thread spiral, such that by means of a external key can be moved longitudinally inside threaded duct. This cutting tool when you reach the bottom of the duct contacts the surface of the pipe to proceed to the drilling by its progressive advance. Once the hole is made, the branch is sealed in its part upper to avoid leaks between the mill and the conduit. In current T-shunt systems, you cannot prevent fluid leaks outside during the process of drilling or pressure checks or injections of inert gases, necessary in gas installations to evacuate the air inside the new pipes. Due to construction methods used, the current T-leads They have a size limitation.

Description of the invention

The device for making derivations under pressure in fluid conduction networks object of the present registration, is characterized in that it comprises a means of making the orifice safely, keeping the disc severed by the cutter safely, together with the chip produced, outside of the fluid flow. It also includes improved sealing means and systems for carrying out the air tightness test and replacing an inert fluid in situ .

In fact the device comprises a structure General external conformation similar to a shunt device conventional, with the main duct arranged so substantially radial with communication through the seat and the lateral extraction duct to communicate the device with the fluid outlet line forming the mentioned `` T ''.

The new invention comprises in the duct radial or main duct a strawberry specially designed for the perforation of the pipe to be derived. The strawberry is shaped like inverted glass with a lower toothed crown and two threads on its upper part of different diameter. The radial duct presents in its upper part a threaded neck where the strawberry is fixed in its anchor position. This neck has its outer contour another thread for fixing an external cover with a gasket tightness and for the coupling of the drilling tool.

As discussed at the top of the milling cutter there is a threaded extension, of smaller diameter than the neck fixing thread, which has inside a emptying for the coupling of the drilling tool, such as a hexagonal hollow or similar. In this extension the axis of tool feed by means of a corresponding male and nut clamping thread.

The crown teeth present inside internal threads that makes the disc subject to the strawberry once the hole is made. The passage of these threads of Thread is the same as the advance step of the drilling tool. With the perforation some shavings of the material of the perforated pipe, for example if it is a pipe plastic, which are redirected to the inside of the strawberry behind the disk, so that they are confined and do not go to circulating flow where they can cause traffic jams and breakdowns. These shavings are addressed by the teeth of the strawberry, which they have a bevel of the attack surface inwards, causing this desired effect. In addition the teeth are Oversized externally with respect to the body of the milling cutter in order to avoid friction during drilling between milling cutters and pipeline.

Said tooth design allows the disc be held firmly inside the strawberry with what is it is possible to make large holes without the disk or produced remains can cause problems by falling off and falling  inside the canalization.

The strawberry can present in an alternative of realization your conified upper part, so that you can act bypass valve. Indeed, if you want the strawberry you can present at the top opposite the crown a conical widening of diameter greater than the diameter of the hole perforated, so that when advanced by the tool against the sealed pipe said hole. This widening is arranged in a position lower than the two upper threads so as not to interfere with them. With this the strawberry has a utility after having made the hole in the pipe, complementing the existing needs in any derivation.

The drilling tool comprises a body tubular coupling on the neck of the radial or main duct of the device that in its upper part has a spindle of movement of an inner shaft, which is attachable to the threaded extension in the upper part of the mill. For fixing to the mill, the shaft has at its end a male corresponding with the above hexagonal hole and a nut of  anchor with the threaded contour of said extension. In proximity to the male the shaft has a retaining ring of the nut. This ring prevents the anchor nut from being lost and that the drilling tool can be mounted without fixing the shaft to the Strawberry. The outer body has a lower mouth where the axis is arranged emergently with the anchor male. In the inner contour of said mouth there is a thread steak attachable to the outside of the radial duct neck. Is mouthpiece is prolonged later in a space that communicates with the inside of the radial duct when the cutter is inwardly displaced. In turn this camera is communicated with the outside through a stop valve. This valve serves to perform the installation tightness test once connected the branch and before making the hole in the pipeline. Also through this valve I could proceed to purged from the installation if necessary.

The body of the drilling tool presents in the top a spindle for shaft displacement. Saying shaft is inserted axially slider inside the spindle, so that it can take different relationships of displacement, so the spindle can be shorter than the longitudinal displacement of the axis, defined between the position of the cutter coupled to the upper neck of the radial duct and the cutter in drilling position, said displacement being performed simply by pushing or pulling the shaft. In addition, the axis Sliding allows the radial duct to have a large length if deemed convenient The union between the shaft and the spindle it is carried out by a pin that is inserted into a Transverse housing exist at the top of the spindle. The shaft has a series of transverse holes that can be face with this accommodation, allowing the entry of the pin and their mutual interlocking, with which the whole stands for its handling. In order that said pin does not come out or misplaced presents a retaining ring at the opposite end of the spindle projection. Furthermore said ring allows the pin can be used as a quick-acting lever when Look for the hole in the shaft where it will be locked. The axis of drilling tool has at its upper end a coupling of  a standard or similar key for its turn. The spindle has a circular groove near the end of its path in order to warn the operator of the proximity of the end of the thread.

For the realization of the bypass hole and after the device seat is attached to the pipe, the tool axis to the threaded extension of the cutter, introducing the hexagonal tap in the hole and fixing the nut. TO then the body curls around the neck of the duct radial of the device sealing the assembly. Turning the shaft, the strawberry unscrews from its inner seat in the neck and Go to the pipe. This displacement of the strawberry between the upper neck and its contact with the lower pipe occurs easily, simply pushing the shaft, not being necessary its screwed up or make any contact with the walls of the radial duct

When the mill comes into contact with the pipe, the spindle is screwed to a position that allows the pin maintaining the maximum possible `` L '' stroke. One time introduced the pin in one of the holes of the shaft that allow the union of said shaft and the spindle, the shaft is rotated so that the teeth of the milling cutter on the surface of the pipe, until the separation of the perforated disc, with which the orifice. Then, unscrew the spindle until leaving thread and stretch from the shaft of the butt tool, until the cutter arrives to the neck and is operated in reverse until the milling cutter screw completely into the inner neck seat, again establishing a tight seal of this end of the device. The outer body is unscrewed and the shaft is released its lodging in the head of the strawberry. The neck is ready for closing the device using a cover with its corresponding board. In case the device can be seen affected by vibrations a nut can be placed anti-detachment coupled with the upper thread of the strawberry extension and supported on the upper surface of the radial duct neck, covered by the lid.

Given that the new invention is Especially indicated to make derivations in pipes in service, subject to high internal pressure with respect to outside, said inner pressure of the pipe to be derived can push the mill and shaft assembly when the orifice. Said extension out, is usually in shape slow and progressive during unscrewing of the spindle and, when leaving This thread, when accompanied by the hand by the operator.  However, due to improper handling, and the effect of the pressure difference between the inside of the pipe and the rear of the mill the shaft can be ejected to remarkable speed with the risk of causing injury to the operator if located on the axis lift path. It is planned that the body of the tool has an arc or protection that covers all the extension of the axis, so that it prevents the operator can put the face or other body part in the way of shaft extension, allowing key operation for handling

Another way to avoid such risk is to compensate for the difference in pressure between the pipeline a bypass and bypass body when it is drilling said pipe and the disc is not yet loose. This way when the  disk has been completely separated since there is no difference from pressure between the front and the back of the milling cutter or cutting tool there is no force that raises the shaft. This compensation is made through existing holes on the contour of the cutter or cutting tool, arranged so that the chip cannot come out, but that the fluid pressure of the pipe that leaks between the teeth and the disc can pass to the derivation T.

Although, in a preferred use of the device, the upper closure of the radial conduction is performed by a screw cap, which allows access to the cutter at any time a posteriori, it is expected that said closure and sealing also can be more definitively if they are not going to be done anymore jobs. Indeed, on the neck of the radial duct you can arrange a cap fitted and covered by a sleeve that hugs its contour and the extension of the radial duct, both being suitable for solidarity by gluing, thermofusion in case of plastic, welding or others.

The device of new invention allows the Performing all operations without leaks at outside, avoiding possible risks and allowing to work with pipes subjected to higher pressures than in devices alternative derivation.

To complete the description that follows will perform and in order to help a better understanding of their characteristics, is accompanied by the present specification, of a set of figures, in an illustrative and non-limiting way, where The most significant details of the invention are depicted.

Brief description of the designs

Figure 1.- Shows a sectional view of the T-tapping of the device with the cutter on its top and closed with a lid.

Figure 2.- Shows a detailed view sectioning of the drilling tool coupling to the neck of the radial duct and strawberry.

Figure 3.- Shows a sectional view of the complete device with the milling cutter inserted into the radial duct

Figure 4.- Shows a sectional view of the drilling of the pipe.

Figure 5.- Shows a detailed view sectioning of the cutter coupled to the radial duct neck with the collected disk

Figure 6.- Shows a detailed view sectioning of the cutter against the pipe as a shutter of flow.

Figure 7.- Shows a detailed view sectioning of the strawberry with a non-slip thread coupled.

Figure 8.- Shows a body variant of T shunt consisting of a conventional T and the neck of Strawberry coupling welded or glued.

Figure 9.- Shows a body variant of T shunt consisting of a T of female branches, connected with male seat ducts on the pipe and Strawberry top receiving neck.

Figure 10.- Shows a body variant of T shunt consisting of a fully fabricated T incorporating the strawberry, the neck and the lid.

Figure 11.- Shows a device variant with full-fledged T-body and seat and ready for use, incorporating the strawberry, neck and lid.

Figure 12.- Shows a device variant with the T bypass body attachable to a seat preexisting through a male connected to the female connection of said seat.

Figure 13.- Shows a device variant with the T bypass body attachable to a seat preexisting through a double female sleeve connected to the male ends of the seat and the shunt.

Figure 14.- Shows a detailed view sectioning of the strawberry with top closure by lid assembly and welded sleeve.

Figure 15.- Shows a view of the part upper of the tool with the protection arc around the axis extended.

Figure 16.- Shows a sectional view of a milling cutter or cutting tool with offset windows Pressure.

Description of a preferred embodiment

In view of the commented figures and agree with the numbering adopted, you can see in them a preferred but not limited embodiment of the invention, the which consists of a device comprising a body in the form of T with a radial duct (1), presenting a lower opening (6) and in its middle part a transverse duct with a mouth (7) bypass, the lower opening (6) of the radial duct (1) to a solidarity seat or collar with the pipe (27) to be derived. The radial duct (1) has in its upper end an anchor neck (8) of a milling cutter (3), said neck (8) having an inner threaded area (10) for fixing said milling cutter (3) and an external threaded area (9) for  the coupling of a cover (2) or a drilling tool. The Strawberry (3) comprises an inverted vessel-shaped body, with a crown of teeth (11) in its lower mouth, said teeth (11) oversized with respect to the contour (13) Strawberry cylindrical (3). In turn, said teeth (11) have in its inner face threads (12) of thread for the retention of the disc (52) sectioned and chips (29) produced during the pipe drilling (27). The strawberry (3) presents in its part upper by a stepped extension, which has a body lower cylindrical with a threaded zone (33) consistent with the thread (10) existing in the inner contour of the neck (8) and a seal (4) sealing. This extension presents in its part end a second threaded zone (32) of lower diameter and existing in its upper base a hole (51) for receiving a male (15) prismatic or similar. In an alternative embodiment the upper part of the surrounding contour of the strawberry body (3) presents a conicity (30) widened of increasing entity, its diameter being greater than the outer contour (13) of the milling cutter and to the diameter of the crown of teeth (11).

On the outer contour of the neck (8) there is coupled a cover (2) with the threaded inner contour corresponding with the thread (9) of the neck and a gasket (5) of tightness On said neck (8) a tool of perforation, constituted by a tubular body (17) that in its lower part has a threaded mouth (53) attachable to the aforementioned neck (8), in its threaded area (9), when it is not the cover (2) attached. This body (17) has a camera (26) internal communication with the radial duct (1) through the neck hole (8) and in turn a valve (18) of communication with the outside In the upper body (17) a threaded spindle (21) is found. This spindle (21) presents a longitudinal axis (22) housed therein, preferably cylindrical, which has at its lower end a male (15) attachable with the top hole (51) of the cutter (3) and a nut (16) or threaded bush attachable to the contour (32) threaded of the strawberry (3). The shaft (22) has a position after said nut (16) a retaining washer (23). The spindle (21) It has a threaded insert (14) in its contour in the body (17) of the tool, of a length L greater than the displacement in advance required by the milling cutter (3) when drilling the pipe (27), existing in this thread (14) a circular groove (14-a) next to its lower warning end End of thread. Said threading (14) of the spindle (21) has the same step as the threads (12) of the teeth (11).

The body (17) of the drilling tool presents between the inner chamber (26) and the upper spindle (21) a joint (19) airtight and a shaft rotation bearing (20) (22). Spindle (21) has in its upper part a locking pin (24) of the shaft (22) in collaboration with transverse holes (28) existing on said axis (22). Said pin (24) presents in a end an elastic ring (25) spindle anti-extraction (21). Said shaft (22) has at its upper end a head Prismatic or similar clamping of a turning key.

The milling cutter (3) attached to the neck (8) in position resting may be retained by a nut (31) anti-detachment joined with the contour (32) threaded and supported on the upper edge of said neck (8), under the cover (2).

In a closing alternative, there is a lid (55) lace over the neck (8) that presents around its contour a cylindrical sleeve (54) that encompasses and is prolonged on the radial duct (1), suitable for solidarity by thermofusion, gluing, welding or other means of connection more or less permanent

In an alternative embodiment the tool of perforation comprises on the upper part of its body (17) a U-shaped safety arch (56), extended by one length equal to or greater than the length of the shaft (22) at its maximum extent out of said body (17) of the tool. The mentioned arch (56) It presents its two arms arranged on both sides of the shaft (22).

In an alternative embodiment of the strawberry (13), comprises a series of windows (57) or through holes in the contour (13) that communicate the inside of the strawberry glass (3) with the outside

In an alternative embodiment the body of the T shunt is constituted by a conventional T (34) with male ends presenting related at its open end (35) of the radial duct a neck (36) by welding or gluing, with the Strawberry (3) and lid (2).

In another alternative embodiment the body of the derivation in T is constituted by a T with ends (37) female and bypass duct (38) male, to which they are attached by welding or gluing the neck (39) and the seat (40) or base attachable to the pipe.

In another alternative embodiment the body of the derivation in T is constituted by a T (41) manufactured integrally for the application, which incorporates the neck of origin (42).

In another alternative embodiment the body of the derivation in T is constituted by a T (43) manufactured integrally for the application, which incorporates the neck (44) and base (45) for coupling to the pipe (27) a derive.

In another alternative embodiment the body of the T branch is connected by its male end (47) to the female mouth (46) existing in the seat collar on the pipe (27) to be derived.

In another alternative embodiment the body of the T branch is connected by its male end (49) to a sleeve (50), which is in turn connected to the male mouth (48) existing in the seat collar on the pipe (27) a derive.

Claims (24)

1. Device for making derivations under pressure in fluid conduction networks, of the type consisting of a T-shaped body lying down with a central radial duct (1), attachable by its mouth (6) inferior to a seat or connecting collar with the pipe (27) to be derived and a lateral duct with a mouth (7) for extracting the fluid from the branch, the radial duct (1) presenting a removable access cover (2), characterized in that it comprises a drill (3) drilling, in the form of an inverted vessel that has a coaxial cylindrical extension in its opposite part to the crown of teeth (11) with a step in two consecutive threaded zones (32 and 33) of decreasing diameter, being an area (33) threaded suitable for coupling the cutter with a threaded area (10) existing in the upper part of the radial duct; and because said extension of the milling cutter (3) has a hole (51) in its upper base in relation to an advance tool, assisted by the threaded area (32); and because it comprises a tool for handling and advancing the milling cutter (3) constituted by a body (17) attachable to the upper part of the radial duct (1) with a shaft (22) removable by a spindle (21) operatively suitable for Removing the cutter (33) from its threaded area (10) from its seat at the top and for drilling the pipe (27) to be derived. 2. Device for making derivations under pressure in fluid conduction networks, according to claim 1, characterized in that the drilling teeth (11) existing in the lower crown of the milling cutter (3), form a larger bore diameter dimensions than the cylindrical contour (13) of the milling cutter (3). 3. Device for making derivations under pressure in fluid conduction networks, according to claim 1, characterized in that it comprises at the top of the radial conduit (1) a neck (8) or coupling with an internal threaded area (10 ) of coupling of the milling cutter (3) and an area (9) external threaded coupling of a cover (2) or a drilling tool. 4. Device for making derivations under pressure in fluid conduction networks, according to claims 1 and 3, characterized in that the external threaded area (9) of the neck (8) has at its base a seal (5) with a cover (2) or with the drilling tool. 5. Device for effecting derivations under pressure in fluid conduction networks, according to claims 1, 3 and 4, characterized in that the drilling tool comprises a tubular body (17) attachable to the external thread (9) of the neck ( 8) by means of a mouth (53) and having a longitudinally movable axis (22) related to a threaded spindle (21), one end of this axis (22) being removably related to the upper part of the milling cutter (3) and the other end suitable for coupling a tool or wrench. Device for effecting derivations under pressure in fluid conduction networks, according to claims 1 and 5, characterized in that the shaft (22) comprises a male (15) with a coupling nut (16) to the upper end of the strawberry (3); and because said male (15) comprises a shape according to the hole (51) or recess in the upper part of the milling cutter (3); and because the nut (16) is suitable for coupling with the threaded area (32) for fixing; and because the shaft (22) comprises a retaining washer (23) of said nut (16) that prevents incorrect assembly of the shaft with the cutter. 7. Device for making derivations under pressure in fluid conduction networks, according to claims 1, 3 and 5, characterized in that the body (17) of the tool has an inner chamber (26) after the mouth (53), of communication with the duct (1) through the neck hole (8); and because it has a valve (18) for communicating said inner chamber (26) with the outside. 8. Device for making derivations under pressure in fluid conduction networks, according to claims 1, 5 and 6, characterized in that it comprises a screw (21) threaded in the upper part of the body (17), with the hollow core, where the longitudinally sliding shaft (22) is located; And because said spindle (21) comprises a thread (14) of a length L greater than the advance travel required by the milling cutter (3) when drilling the pipe (27); and because it comprises a pin (24) housed in the upper part of the spindle (21) and positionable in a series of transverse holes (28) of the shaft (22) for its solidarity by locking; and because the pin (24) has at one end a retaining ring (25). 9. Device for making derivations under pressure in fluid conduction networks, according to claims 1, 5, 6 and 7 characterized in that the body (17) has a bearing (20) and a seal (19) around the seal shaft (22), both arranged between the inner chamber (26) and the upper spindle (21). 10. Device for making derivations under pressure in fluid conduction networks, according to claims 1, 5, 6 and 8 characterized in that the spindle (21) comprises a groove (14) in proximity to the lower end of the thread (14). -a) End of thread warning circular. 11. Device for making derivations under pressure in fluid conduction networks, according to claim 1, 2, 5 and 8, characterized in that the teeth (11) of the milling cutter (3) have threads (12) ) of thread suitable for the firm hold of the perforated disc (52) and the shavings (29); and because said threads (12) are of the same pitch as the threaded area (14) of the spindle (21). 12. Device for making derivations under pressure in fluid conduction networks, according to claims 1 and 2, characterized in that in an alternative embodiment the milling cutter (3) has an enlarged conicity (30) of increasing entity and larger diameter greater than the outer contour (13) of the milling cutter and the diameter of said crown of teeth (11) operatively suitable for sealing the hole made in the pipe (27) and performing the fluid interruption function. 13. Device for making derivations under pressure in fluid conduction networks, according to claim 1, characterized in that the threaded area (32) has a substantially different passage than the threaded area (33). 14. Device for making derivations under pressure in fluid conduction networks, according to claims 1 and 3, characterized in that the threaded area (33) of the cutter has a groove next to its base where there is a gasket (4) of compressible seal with the neck (8) when said milling cutter (3) is in the resting position coupled to it. 15. Device for making leads under pressure in fluid conduction networks, in accordance with claims 1 and 3, because it comprises a nut (31) anti-detachable coupling to the threaded area (32) of the milling cutter and resting on the mouth of the neck (8) of the duct (1), cover with cover (2). 16. Device for making derivations under pressure in fluid conduction networks, according to claims 1 and 3, characterized in that in an alternative embodiment it comprises a cap (55) fitting on the neck (8), existing around it a cylindrical sleeve (54) that encompasses it, said sleeve being extended on the radial conduit (1), suitable for its solidarity by thermofusion, gluing, welding or other means of permanent or semi-permanent connection. 17. Device for making derivations under pressure in fluid conduction networks, according to claims 1 and 5, characterized in that it comprises an arc (56) of protection on the body (17) of the tool, in projection of the axis (22) outside said body (17); and because the arc (56) has a U-shape and its length is equal to or greater than the length of the shaft (22) at its maximum extension of the body (17); and because the arc (56) is arranged on one side and the other of the path of said axis (22). 18. Device for making derivations under pressure in fluid conduction networks, according to claims 1, 2 and 11, characterized in that it comprises a series of windows (57) or through holes in the body of the milling cutter (1) or tool cutting, operatively capable of communicating, during the drilling of the interior of the pipe (27), said pipe and the rear space of the radial conduit (1) and the branch in general; and because said windows (57) are preferably arranged in the surrounding contour (13) of the milling cutter (3). 19. Device for making derivations under pressure in fluid conduction networks, according to claims 1 to 18, characterized in that in an alternative embodiment the body of the T-branch is constituted by a conventional T (34) with male ends which has a neck (36) connected by welding, gluing or the like connected to the end (35) of the radial conduit, with the cutter (3) and the cover (2). 20. Device for making derivations under pressure in fluid conduction networks, according to claims 1 to 18, characterized in that in an alternative embodiment the body of the T branch is constituted by a T with female ends (37) and male bypass duct (38), to which the neck (39) and the seat (40) or base attachable to the pipe are joined by welding or gluing. 21. Device for making derivations under pressure in fluid conduction networks, according to claims 1 to 18, characterized in that in an alternative embodiment the body of the T branch is constituted by a T (41) manufactured integrally for the application, which incorporates the neck (42). 22. Device for making derivations under pressure in fluid conduction networks, according to claims 1 to 18, characterized in that in an alternative embodiment the body of the T branch is constituted by a T (43) manufactured integrally for the application, which incorporates the neck (44) and the base (45) to attach to the pipe (27) to be derived. 23. Device for making derivations under pressure in fluid conduction networks, according to claims 1 to 18, characterized in that in an alternative embodiment, the male lower mouth (47) of the T is welded or glued to a collar with female mouth (48). 24. Device for making derivations under pressure in fluid conduction networks, according to claims 1 to 18, characterized in that in an alternative embodiment the lower male mouth (47) of the T is attached to the collar (48) by welding or glued through an intermediate sleeve (50).