RU209374U1 - PIPE COUPLING - Google Patents

Abstract

The utility model relates to the field of mechanical engineering, in particular to pipe couplings that replace flanged and welded joints of pipe ends facing each other in pipelines or tubular elements. The technical result provided by the utility model is the simplification of work for the installation and dismantling of couplings in cramped conditions while maintaining the reliability and safety of the coupling connection of pipe ends facing each other in pipelines or tubular elements. The design of the pipe coupling consists of an elastomer sealing collar that is in functional and structural unity; at least one tie bolt directed tangentially to the body, passing through two tie elements placed on both sides of the longitudinal section of the body, each of which has a curved outer surface directed in the direction opposite to the body section, and at least one of the tie elements is made with a through hole, the inner dimension of which in the direction of the circumference of the tightening elements is greater than the outer diameter of the pin of the tightening bolt. Each tie bolt is installed in the tie elements with the possibility of interacting with its head with the curved outer surfaces of the tie elements through a washer made in the form of a pipe, on the generatrix of the outer surface of which spiral grooves are made, and installed on the tie bolt rod between the head of the tie bolt and the curved outer surface of one of the tie elements, as well as through the mating fastener of the tie bolt, located in the opposite tie element, which leads to simplification of mounting and dismantling of the coupling in cramped conditions. Holes are made in the head of the tie bolt, located tangentially to the axis of the tie bolt rod and designed to prevent the tie bolts from unscrewing relative to each other and relative to the coupling body, as well as sealing the tie bolts with a locking element made of metal wire with a cross-sectional diameter smaller than hole in the head of the coupling bolt, resulting in increased reliability and safety of the coupling connection.

Description

The utility model relates to the field of mechanical engineering, in particular to pipe couplings that replace flanged and welded joints of pipe ends facing each other in pipelines or tubular elements.

From the prior art, a pipe coupling is known, containing a ring rolled from a tape of one or more parts, at the ends of each part of the ring, loops are formed from a tape, into which rods are embedded, attracted to each other by pins located in the releases provided in the loops, and an insert, installed at the place of the ring connector and adjacent to the sealing cuff; at least one connecting element is installed in the releases of the loop, connecting the rod with the pin and made in the form of a bar with one or two holes or grooves in one plane or in mutually perpendicular planes or in the form of a bracket having two side walls with holes and a rounded central wall between them, one part of the connecting element interacts with the rod, and the other part - with the pin, which is placed on the same axis with the rod or on one and / or the other side of it, and the connecting element in the form of a bar or a pin is located with the possibility of getting out of contact with a rod when the nut is not completely unscrewed from the stud, and when at least two studs are installed at one end of the ring, they or a connecting element in the form of a bar are interconnected by a plate. One of the rods is installed in front of the bar with a stop against its end facing the other rod, or one of the ends of the pin is bent in the form of a hook, inside which the rod is located. At least one of the rods in the release of the loop is bent, for example, in the form of a semicircle with an inner radius corresponding to the radius of the pin installed inside the semicircle of the rod and in the holes of the bracket, in which the width of the side walls exceeds the inner size of the semicircle. The stud is bent in the central part and its ends are located on both sides of the rods and are placed in the holes of the bar that contacts the end with the rod, and the second rod is installed inside the bent part of the stud, which has a round or rectangular cross section at the bend (Russian Federation patent for invention No. 2137012 , according to class IPC F16L 21/06, the filing date of the application and the start date of the patent validity period is 06/11/1998, the publication date is 09/10/1999).

A well-known pipe coupling with an elastomeric sealing cuff having a C-shape, passing towards each other, the sealing edges of which are supported on the cuff wall through a spring ring and which is covered by a body narrowed by a locking device and placed between the cuff and the body with a sheet insert overlapping the longitudinal section body, and the sealing flanges are made in a free state with a diameter exceeding the diameter of the pipes to be connected, and with the possibility of upsetting in the circumferential direction when the body is tightened and a snug fit to the pipes to be connected due to the pressure action of the spring rings placed in the annular groove between the cuff wall and the sealing edge made with an annular thickening on its side facing the wall of the cuff. The spring rings are made with a U-shaped cross section, installed by its jumper connecting the flanges of the ring to each other, towards the corresponding base of the sealing flange, the shelves of the spring rings are made with slots, while the slots are made of a minimum width, and the slots of one of the shelves are offset relative to the slots the second shelf by an amount exceeding the width of the slot (patent of the Russian Federation for the invention No. 2068525, according to class IPC F16L 21/06, the filing date of the application and the start date of the patent term is 12/15/1992, the publication date is 10/27/1996, Convention priority 01/15/1992 SN 109/92).

Known clamping device with reinforced clamping lugs, which contains a clamp having a pair of protruding lugs, and compression means interacting with these lugs. Each of the lugs of one pair is equipped with reinforcements capable of withstanding deformation of the lugs under the action of the compression means. Each ear contains a connecting section with the girdle part of the collar, which is straightened relative to this part, and a pressure wall with which the compression means come into contact and which is bent towards the girdle part. The device comprises two tabs bent so as to extend exactly parallel to the axis of the screw, moving away from the connecting area. Interacting with the edges of the element, screw head or nut, with an emphasis on this eye, these paws make it possible to fix the element, preventing its rotation (patent of the Russian Federation for invention No. filing of the application and the start date of the patent term 04/12/2006, publication date 08/20/2010, convention priority 04/13/2005 FR 0503689).

Known pipe connection in which the sealing cuff is made of elastomer and forms a shape C in cross section. Oppositely passing whiskers of the cuff are installed on its edge with the help of the formed annular thickening. Outside the cuff, there is a split cylindrical shell of the body with radial flanging, equipped with a lock with tension screws and an internal tongue. The tongue is located between the cuff and the body and covers the longitudinal body gap in the flanging area. Whiskers before shrinking the shell are made larger than the nominal diameter of the pipes to be connected with the possibility of a snug fit to the walls of the pipes when the casing is tightened. A sliding guide with a curved surface is fixed on one annular section of the shell, overlapping the other annular section of the shell. The shutter is displaced in the circumferential direction with respect to the body gap, which is blocked from the outside by a sliding guide passing under the screws zone (patent of the Russian Federation for the invention No. 1991, publication date 08/30/1994, convention priority 03/20/1990 SN 911/90).

A well-known pipe coupling for connecting two ends of pipes, including a clamp band having a longitudinal slot with its first side and a second side spaced from it, and a tension mechanism for reducing the inner diameter of the clamp band, as well as a jumper element for jumping the longitudinal slot, which is provided on the inner side of the collar band and extends from the first side of the longitudinal slot in the direction of the second side of the longitudinal slot along the arc section, while the length of the arc section is less than the inner circumference of the collar band, characterized in that at least one spacer element passing in the arc section is installed with a geometric closing on the inner side of the collar tape, and the edge of the spacer element facing the second side of the longitudinal slot is located at a distance from this second side of the longitudinal slot, and this edge of the spacer element forms a stop for the free end of the bridge element (patent of the Russian Federation on the invention Tenie No. 2607422, class. IPC F16L 21/06, filing date of the application and start date of the patent term 02/07/2013, publication date 01/10/2017, convention priority 02/10/2012 EP 12154836.6).

Other technical solutions for couplings are also known: RU 2655451 C2, 05/22/2014; EP 1647755A1, 04/19/2006; DE 3843738 A1, 20.07.1989; EP 1767842 A2, 03/28/2007; US 2005/189768 A1, 09/01/2005; US 4664428 A, May 12, 1987; US 2994934 A1, 08.08.1961; US 2546098 A, 03/20/1951; US 2775806 A, 01.01.1957; GB 835005 A, May 18, 1960.

The closest solution in terms of technical essence, chosen as a prototype of the claimed utility model, is a pipe coupling with an elastomer sealing cuff, which before installation exceeds the outer diameter of the pipes to be connected and is enclosed by an annular body with a longitudinal axial cut, made with the possibility of contraction around the circumference during installation sealing cuff by means of a clamping device having at least one tie bolt directed tangentially to the body, passing through two tie elements with a curved outer surface, placed on both sides of the longitudinal section of the body, and located with its head on the curved outer surface of the tie element. The tie elements are installed with their curved surfaces in the direction opposite to the longitudinal section, and are made with a U-shaped cross section, the tie bolt is installed in the tie elements with a gap and with the possibility of interaction with its head and a nut screwed on it with the curved surfaces of the tie elements, and at least at least one of the tie elements is made with a through hole, the inner size of which in the direction of the circumference of the tie elements is greater than the outer diameter of the tie bolt rod (patent of the Russian Federation for the invention No. counting the patent validity date 12/24/1992, publication date 03/10/1997, convention priority 01/07/1992 SN 15/92).

A pipe coupling of this design has technical problems, the solution of which is directed by the claimed utility model, since the disadvantage of the known pipe couplings is that during the installation and dismantling of the pipe coupling in limited spaces with maximum compression of the coupling, the head of the coupling bolt moves to the plane of closure of the coupling elements, and this complicates access to the head of the tie bolt and, in particular, can lead to the failure of the faces of the head of the tie bolt. In addition, it is not possible to fix the coupling bolt from unscrewing after the coupling has been installed.

The solution of the above technical problems, in particular for the prototype of the utility model, is provided in the design of the pipe coupling, which consists of an elastomer sealing collar that is in functional and structural unity, before installation, exceeds the outer diameter of the connected pipes in size and is covered by an annular body with a longitudinal axial section made with the possibility of tightening around the circumference when installing the sealing collar by means of a clamping device having at least one tie bolt directed tangentially to the body, passing through two tie elements placed on both sides of the longitudinal section of the body, each of which has a curved outer surface directed in the opposite direction section of the housing, and at least one of the tie elements is made with a through hole, the inner size of which in the direction of the circumference of the tie elements is greater than the outer diameter of the tie bolt rod. Each tie bolt is installed in the tie elements with the possibility of interacting with its head with the curved outer surfaces of the tie elements through a washer made in the form of a pipe, on the generatrix of the outer surface of which spiral grooves are made, and installed on the tie bolt rod between the head of the tie bolt and the curved outer surface of one of the tie elements, as well as through the mating fastener of the tie bolt, located in the opposite tie element, which leads to simplification of mounting and dismantling of the coupling in cramped conditions. Holes are made in the head of the tie bolt, located tangentially to the axis of the tie bolt rod and designed to prevent the tie bolts from unscrewing relative to each other and relative to the coupling body, as well as sealing the tie bolts with a locking element made of metal wire with a cross-sectional diameter smaller than hole in the head of the coupling bolt, resulting in increased reliability and safety of the coupling connection. A special case of the implementation of the utility model is that the tie elements are made with a cross section in the form of a U-shaped (semi-tubular) section, in which the tie bolt is as free as possible from unwanted and interfering effects of the bending force, and the tension forces acting on the body are largely The degrees only act in the circumferential direction of the coupling housing and can, if possible, run close to the coupling housing.

Thus, the technical result provided by the utility model is to simplify the installation and dismantling of couplings in cramped conditions while maintaining the reliability and safety of the coupling connection of pipe ends facing each other in pipelines or tubular elements.

The essence of the utility model and the possibility of its practical implementation is illustrated in Fig. 1, 2, 3, where:

fig. 1 - pipe coupling with clamping elements in cross section in the form of a U-shaped (semi-tubular) section in a free (not clamped on the pipeline) state;

fig. 2 - pipe coupling with clamping elements in cross section in the form of a U-shaped (semi-tubular) section in a tightened (clamped on the pipeline) state;

fig. 3 - pipe coupling with bolts fixed relative to each other by a locking element made of metal wire;

where:

1 - coupling element in cross section in the form of a U-shaped (semi-tubular) section;

2 - body of the pipe coupling;

3 - sealing cuff;

4 - head of the coupling bolt;

5 - fixing element;

6 - holes made in the head of the coupling bolt;

7 - washer;

8 - grooves;

9 - pinch bolt rod;

10 - reciprocal fastener of the coupling bolt.

The general design of the pipe coupling has an annular body 2, divided in the direction of its longitudinal axis. The housing encloses in cross section an elastomer sealing collar 3, the inner diameter of which is large compared to the outer diameter of the pipes to be connected. The body 2 is made with the possibility of tightening around the circumference by means of a clamping device having at least one tie bolt directed tangentially to the body, passing through the tie elements 1 (Fig. 1 and 2), placed on both sides of the longitudinal section of the body 3.

Between one of the two clamping elements 1 and the head of the coupling bolt 4, made in accordance with GOST 7798-70, a washer 7 is installed (Fig. 1 and 2), made in the form of a pipe, taking into account the requirements of GOST 27017-86. The length of the washer 7, indicated by the grooves 8 applied to it along the generatrix in accordance with the technical data sheet for the product, is determined depending on the diameter of the coupling. On the end surface of the washer 7 adjacent to the head of the tie bolt 4, the roughness is equal to or less than that of the head of the tie bolt 4 in accordance with GOST 2789-73. The mating fastener of the coupling bolt 10 is made in accordance with GOST 27017-86 and is located in the opposite coupling element.

The design of the pipe coupling works as follows. The coupling in a pre-mounted (not clamped) state is installed on the pipes and, after laying the pipes, is moved along the butt gap. By rotating the head of the coupling bolt 4, the body of the pipe coupling is tightened around the circumference with a decrease in diameter. In this case, the sealing cuff is tightly pressed against the outer side of the pipes to be connected.

In FIG. 1 shows a pipe coupling with clamping elements in the form of a U-shaped (semi-tubular) section in a free (not clamped on the pipeline) state, while figure 2 depicts the same coupling in a tightened (clamped on the pipeline) state. During the tightening of the housing, the clamping elements 1 move towards each other. With this movement, the tie rods 1 change their position relative to the pin of the tie bolt 9, as can be seen from the comparison of both couplings in FIG. 1 and 2. The resulting relative movement between the tightening elements 1 and the shaft of the tightening bolt 9 is not obstructed because the shaft of the tightening bolt 9 passes through the washer 7 and through at least one through hole of the tightening elements 1 with a radial clearance. Since on the end surface of the washer 7 adjacent to the head of the tie bolt 4, the roughness is equal to or less than that of the head of the tie bolt 4 in accordance with GOST 2789-73, such a combination of roughness ensures optimal sliding in the bolt-washer pair, which leads to a decrease in torque when tightening the coupling bolt, transferring the optimal force to the head 4 and the pin 9 of the coupling bolt for better tightening of the coupling body.

In addition, the washer 7 moves the position of the head of the tie bolt 4 away from the plane of closure of the tie elements 1 (FIGS. 1 and 2), which simplifies the mounting and dismounting of the coupling in cramped conditions.

The holes 6 made in the heads of the tie bolts 4 are designed to pass through them the fixing element 5 (Fig. 3), made of metal wire, with a cross-sectional diameter smaller than the hole in the head of the tie bolt 4. The fixing element 5 is passed through the holes in heads of tie bolts 4 and is braided after installing and tightening the tie bolts, as well as checking the pipe connection for tightness, which leads to fixing the tie bolts from unscrewing relative to each other and relative to the coupling body.

Known solutions containing similar distinctive features of the utility model, the author has not found.

Claims (2)

1. A pipe coupling consisting of an elastomer sealing collar that is in functional and structural unity, before installation, exceeds the outer diameter of the pipes to be connected and is covered by an annular body with a longitudinal axial cut, made with the possibility of contraction around the circumference when the sealing collar is installed by means of a clamping device, having at least one tie bolt directed tangentially to the body, passing through two tie elements placed on both sides of the longitudinal section of the body, each of which has a curved outer surface directed in the direction opposite to the body section, and at least one of the tie elements is made with a through hole, the inner dimension of which in the direction of the circumference of the tie elements is greater than the outer diameter of the tie bolt shaft, characterized in that the tie bolt is installed in the tie elements with the possibility of interacting with its head with curved the outer surfaces of the tie elements through a washer made in the form of a pipe, on the generatrix of the outer surface of which spiral grooves are made, and installed on the tie bolt rod between the head of the tie bolt and the curved outer surface of one of the tie elements, and also through the mating fastener of the tie bolt, located in the opposite tie element, in the head of the tie bolt, there are holes located tangentially to the axis of the tie bolt rod and designed to prevent the tie bolts from unscrewing relative to each other and relative to the coupling body, as well as sealing the tie bolts by means of a fixing element made of metal wire, with cross-sectional diameter smaller than the hole in the head of the tie bolt. 2. Pipe coupling according to claim. 1, characterized in that the tie elements are made with a cross section in the form of a semi-tubular section.

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