JPH05164279A - Flexible expansion joint - Google Patents

Abstract

PURPOSE:To provide a flexible expansion joint which can easily and reliably connect a couple of pipes eccentric each other, by arranging a flare pipe, a dimension adjusting pipe, an expansion adjusting device, and the like, each having a particular constitution, and adjusting dimension and absorbing eccentricity between two points. CONSTITUTION:To connect a couple of pipes 30 and 30' which are eccentric each other, a taper flange 2 of a flare pipe 1 is clamped to a flange 31 of the exhaust pipe 30 of one side through a tapered spacer 33. At this time the spacer 33 is rotated to incline the flare pipe 1 toward the eccentricity. One end part of a dimension adjusting pipe 6 is slid back and forth in an expanded part 3 of the flare pipe 1, then a flange 7 at the other end part is clamped to a flange 31' of the pipe 30' of the other side. At the same time, hinges 18 of the other side of an expansion adjusting device 10 are tightened together. Then, an annular packing 8 is inserted into a taper part 4 of the expanded part 3. Tie rod bolts 19 of the expansion adjusting device 10 are clamped to the hinges 13 and 18 of both sides with adjusting nuts 20 to connect the pipe 30' of the other side and the flare pipe 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stretchable flexible pipe joint having stretchability and flexibility which is used when assembling a piping unit, prefabricated pipes and the like on site.

[0002]

2. Description of the Related Art Conventionally, when assembling a piping unit, prefabricated piping, etc. on site, when connecting a portion requiring dimensional adjustment, there was no reliable expandable and flexible pipe joint. , I measured the dimensions of the necessary parts on site and manufactured the connecting pipes accordingly. Generally, this is called the current joint pipe.

The conventional method for producing an union pipe is relatively easy to produce in the case of general carbon steel pipe, but it is difficult to perform on-site processing and welding, such as stainless steel pipe and lining steel pipe. In that case, since it will be manufactured at the factory, it will not be possible to connect the piping during the manufacturing period, and the work on hand and that part will be interrupted.

On the other hand, in the factory, the current joint pipe must be manufactured with the shortest delivery time, which is one of the causes for disturbing the process of other products.

Further, in order to actually measure the dimensions of the necessary parts for manufacturing the present combined pipe, at least two or more veteran craftsmen are required, and it is possible to adjust the expansion and contraction flexible pipe due to the current lack of manpower. There was a demand for the development of joints.

[0006]

Therefore, the present inventors have found that
We made a diligent effort to develop an expansion and contraction flexible pipe joint that can easily connect the pipes that require dimension adjustment without producing the existing joint pipe as described above. Therefore, an expansion and contraction flexible pipe joint that can absorb misalignment and easily and reliably connect misaligned pipes is provided.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an expansion and contraction flexible pipe joint of the present invention has a taper flange fixedly connected to a flange of one of the connecting pipes at one end, and a diametrically expanded portion on the other side. A flare pipe having a taper portion that expands outward at the tip of the enlarged diameter portion, and a flange is fixedly provided on the outer peripheral surface of the tapered portion, and one end portion at the enlarged diameter portion of the flare pipe. A size adjusting tube having a flange fixedly provided at the other end, an annular packing having a wedge-shaped cross section, which is attached to the outer periphery of one end of the size adjusting tube and is press-fitted inside the tapered portion of the flare tube; A loose flange that is fitted to the outer circumference of the dimension adjusting pipe so as to face the flange on the outer peripheral surface of the taper portion, sandwiches the annular packing, a plurality of hinges arranged on the opposite side in the circumferential direction of the flange, and bolts that tighten them. ， Nuts and flaps of the dimension adjustment tube A plurality of hinges that are arranged in the circumferential direction of the flange and sandwich the flange of the other connection pipe and tighten them with bolts and nuts, and a plurality of hinges that penetrate the plurality of hinges and the plurality of hinges in the circumferential direction of the flare pipe flange. Of the tie rod bolts, and an expansion and contraction adjusting device including adjustment nuts for dimensionally adjusting the tie rod bolts on both sides and tightening and fixing the tie rod bolts from both sides of each hinge.

The annular packing in the expansion / contraction flexible pipe joint having such a structure is tapered on the inner peripheral surface so that the side press-fitted inside the tapered portion of the flare tube has a small diameter.
The side of the outer peripheral surface that is press-fitted inside the tapered portion of the flare pipe is tapered at an angle larger than the taper portion angle of the flare pipe, and a plurality of arc-shaped grooves are formed in the circumferential direction of the end surface on the smaller diameter side of the taper. It is preferable to use a lip type that is deeply provided substantially parallel to the taper and has a slit deeply provided substantially parallel to the taper of the inner peripheral surface between the end faces of the ribs formed between the arcuate grooves.

[0009]

In order to connect the decentered pipes by the expansion / contraction flexible pipe joint of the present invention configured as described above, first, the flange of one fixed pipe is provided with a tapered flange spacer having sheet packings on both sides. Tighten the taper flange of the flare pipe with bolts and nuts to connect it. At the time of this connection, by rotating the tapered flange spacer, the flare pipe can be inclined in the direction of misalignment between one fixed pipe and the other fixed pipe. Next, slide one end of the dimension adjustment pipe back and forth in the expanded portion of the flare pipe to adjust the dimensions, and use the flange on the other end with a sheet packing to the flange of the other fixed pipe with bolts and nuts. Tighten and connect. At the time of this connection, a plurality of hinges on the other side of the expansion and contraction adjusting device are tightened together in the circumferential direction of the flange of the fixed pipe to sandwich the flange. Next, the annular packing attached to the outer circumference of the dimension adjustment tube is fitted inside the flared tube at the expanded tapered end of the flared tube, and the loose flange of the expansion and contraction adjustment device is bolted to the flange on the outer circumference of the tapered section. The annular packing that has been temporarily tightened on the side is fully tightened, and the outer peripheral surface of one end of the dimension adjusting tube and the inner peripheral surface of the taper portion are in close contact with each other for sealing. At the time of this sealing, a plurality of hinges on one side of the expansion and contraction adjusting device are fastened together with the flange on the outer circumference of the tapered portion. After that, both ends of the plurality of tie rod bolts of the expansion and contraction adjusting device are fixed to the hinges on both sides by tightening adjustment nuts from both sides, and the other fixed pipe and the flare pipe are fixed.

By connecting one fixed pipe and the other fixed pipe with the expansion and contraction flexible pipe joint of the present invention in this manner, the dimensional adjustment in the pipe axis direction and the misalignment between the two pipes are absorbed at the same time. To be done. Further, in the expansion / contraction flexible pipe joint of the present invention, one end of the flare pipe is connected to one fixed pipe and the other end of the flare pipe is connected to the other fixed pipe by the expansion / contraction adjusting device even if internal pressure is applied. The tube never comes out of the flare tube.

Particularly, when the annular packing in the expandable flexible pipe joint of the present invention is of the lip type described above, the internal fluid enters the arcuate groove and the fluid pressure acts on the inner and outer peripheral surfaces of the annular packing, so that the sealing performance is improved. Good, especially when the pressure of the internal fluid rises, the sealing surface pressure on the inner and outer circumferences of the annular packing increases, so the sealing property is extremely good. Further, even if the annular packing is over-tightened, the rib having the slit prevents the arc-shaped groove from collapsing, and the internal fluid enters the arc-shaped groove, so that the sealing function works effectively. Moreover, since this annular packing is excellent in flexibility, it is easy to swing the size adjustment tube back horizontally and easily absorb the misalignment.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the expansion and contraction flexible pipe joint of the present invention will be described with reference to the drawing. In FIG. 1, 1 is a taper flange 2 fixed to one end of a connecting pipe and fixed to the other end. It is a flare tube having an enlarged diameter portion 3, a tapered portion 4 expanding outward at the tip of the enlarged diameter portion 3, and a flange 5 fixed to the outer peripheral surface of the tapered portion 4.

Reference numeral 6 denotes a size adjusting tube having one end inserted into the expanded diameter portion 3 of the flare tube 1 and a flange 7 fixedly provided at the other end.

Numeral 8 is an annular packing having a wedge-shaped cross section which is mounted on the outer periphery of one end of the dimension adjusting tube 6 and is press-fitted inside the tapered portion 4 of the flare tube 1, and a packing retainer 9 having an L-shaped cross section is provided on its rear surface. Has been.

Reference numeral 10 denotes an expansion / contraction adjusting device. The expansion / contraction adjusting device 10 is fitted on the outer periphery of the dimension adjusting pipe 6 so as to face the flange 5 on the outer peripheral surface of the taper portion 4 of the flare pipe 1 and to sandwich the annular packing 8. A loose flange 11 and a plurality of hinges 13 arranged on the opposite side in the circumferential direction of the flange 5, and in this example, a pair of hinges 13 arranged at symmetrical positions in the circumferential direction as shown in FIG.
The hinge 13 and the loose flange 11 are connected to the flange 5.
A bolt 14 and a nut 15 which are tightened and held, a pair of hinges 18 which are arranged in the circumferential direction of the flange 7 of the dimension adjusting pipe 6 and clamp the other connecting pipe by a bolt 16 and a nut 17, and the pair of hinges. 2 penetrating 18 and a pair of hinges 13 in the circumferential direction of the flange 5 of the flare tube 1
The present invention is provided with a tie rod bolt 19 and an adjusting nut 20 for fixing the tie rod bolt 19 to the hinges 13 and 18 on both sides by tightening and fixing the tie rod bolts 19 from both sides of the hinges 13 and 18 after adjusting the dimensions.

Another embodiment shown in FIG. 3 is a modification of the structure of the annular packing, and the other structure is the same as that of the above embodiment. As shown in FIG. 4, the annular packing 8'in this embodiment is provided with a taper 21 on the inner peripheral surface so that the side press-fitted into the tapered portion 4 of the flare tube 1 has a small diameter, and the flare tube 1 on the outer peripheral surface is formed. A taper 22 is attached to the side press-fitted into the tapered portion 4 at an angle larger than the angle of the tapered portion 4,
As shown in FIG. 5, a plurality of arcuate grooves 23, as shown in FIG. 5, are formed in the circumferential direction of the end faces of the tapers 21 and 22 on the small diameter side, substantially in parallel with the taper 21 of the inner peripheral face as shown in FIG. As shown in FIG. 6, a slit 25 is formed in the middle of the end face of the rib 24 shown in FIG. 5 formed between the arcuate grooves 23 and is deep in parallel with the taper 21 of the inner peripheral surface. ..

In order to connect the misaligned pipes by the expansion and contraction flexible pipe joint of the embodiment configured as described above, first, referring to FIG.
As shown in FIG. 5, the taper flange 2 of the flare pipe 1 is connected to the flange 31 of one fixed pipe 30 with the taper flange spacer 33 having the sheet packings 32 on both sides by tightening with the bolt 34 and the nut 35. .. At the time of this connection, by rotating the tapered flange spacer 33, the flare tube 1 can be tilted in the direction of misalignment between the one fixed pipe 30 and the other fixed pipe 30 '.
Next, one end of the dimension adjusting pipe 6 is slid back and forth in the enlarged diameter portion 3 of the flare pipe 1 to adjust the dimensions, and the flange 7 at the other end is seated with the sheet packing 36 and the other fixed pipe 30 '. The dimension adjusting pipe 6 is concentrically connected to the fixed pipe 30 'by tightening bolts 16 and nuts 17 on the flange 31 of the. During this connection, the pair of hinges 18 on the other side of the expansion and contraction adjusting device 10 are arranged at symmetrical positions in the circumferential direction of the flange 31 'of the fixed pipe 30'.
And clamp the flange 31 '. Next, the annular packing 8 attached to the outer circumference of the dimension adjusting tube 6 is fitted into the taper portion 4 of the flared tube 1 at the tip of the enlarged diameter portion 3 and the loose flange 11 of the expansion and contraction adjusting device 10 is attached to the bolt 1.
4, the annular packing 8 which is temporarily preliminarily fastened to the flange 5 side of the outer circumference of the taper portion 4 with the nut 15 is finally tightened,
The outer peripheral surface of one end of the dimension adjusting tube 6 and the inner peripheral surface of the taper portion 4 are closely contacted with each other for sealing. At the time of this sealing, the expansion and contraction adjusting device 10 is provided at the symmetrical position in the circumferential direction of the flange 5 on the outer circumference of the tapered portion 4.
The pair of hinges 13 on one side are fastened together. After that, both ends of the two tie rod bolts 19 of the expansion and contraction adjusting device 10 are fixed to the hinges 13 and 18 on both sides by tightening the adjusting nut 20 from both sides, and the other fixed pipe 30 '.
And the flare tube 1 are fixed.

In this way, by connecting the one fixed pipe 30 and the other fixed pipe 30 'in the expansion and contraction flexible pipe joint of the embodiment, the pipe axial direction between both pipes 30, 30' can be improved. Dimensional adjustment and misalignment are absorbed at the same time. In the expansion / contraction flexible pipe joint of the embodiment, one end of the flare pipe 1 is connected to one fixed pipe 30 and the other end of the flare pipe 1 is connected to the other fixed pipe 30 'by the expansion / contraction adjusting device 10 even if internal pressure is applied. Therefore, the size adjustment tube 6 never comes out of the flare tube 1.

In particular, the telescopic flexible pipe joint of another embodiment shown in FIG. 3 uses a lip type annular packing 8 ',
The internal fluid enters the arcuate groove 23 shown in FIGS. 4 and 5, and its fluid pressure acts on the inner and outer peripheral surfaces of the annular packing 8 ', so that the sealing performance is good, and especially when the pressure of the internal fluid rises. Since the sealing surface pressure on the inner and outer circumferences of ′ increases, the sealing performance is extremely good. Further, the lip type annular packing 8 ′ prevents the rib 24 having the slit 25 from collapsing the arcuate groove 23 even when it is overtightened so that the internal fluid enters the arcuate groove 23. , The seal function works effectively. Moreover, since this lip-type annular packing 8'is excellent in flexibility, it is easy to swing the size adjusting tube 6 back horizontally, and it is easy to absorb the misalignment.

The arcuate groove 23 in the lip type annular packing 8'is an annular groove, and spacers corresponding to the ribs 24 are formed at several places in the circumferential direction so as not to fall into the annular groove. May be.

[0021]

As described above, according to the expansion and contraction flexible pipe joint of the present invention, the misalignment of the pipe between the two points and the adjustment of the longitudinal dimension in the axial direction of the pipe are performed at the same time, so that the gap between the misaligned pipes can be easily achieved. Therefore, it is not necessary to manufacture the existing joint pipe as in the conventional case because the connection can be made securely and reliably. Therefore, it is possible to eliminate the waiting period for the actual size measurement by an experienced craftsman and the on-site piping work during the manufacture of the current joint pipe in order to manufacture the present joint pipe. In addition, it is possible to eliminate one factor that disturbs the process of other products in the factory by producing the current joint pipe with the shortest delivery time, and it also eliminates the need to transport the current joint pipe to the construction site, which shortens the piping construction period. Can contribute.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of an expandable flexible tube joint of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a vertical cross-sectional view showing another embodiment of the expandable flexible tube joint of the present invention.

FIG. 4 is an enlarged cross-sectional view showing a lip-type annular packing in the expandable flexible tube joint of FIG.

5 is a view in the direction of arrow B in FIG.

FIG. 6 is a sectional view taken along line CC of FIG.

FIG. 7 is a vertical cross-sectional view showing a state in which pipes that are misaligned with each other are connected by the expandable flexible pipe joint of FIG.

[Explanation of symbols]

 1 Flare pipe 2 Tapered flange 3 Expanded part 4 Tapered part 5 Flange 6 Dimension adjustment pipe 7 Flange 8,8 'Annular packing 10 Expansion and contraction adjustment device 11 Loose flange 13,18 Hinge 14,16 Bolt 15,17 Nut 19 Tie rod bolt 20 Adjusting nut 21 Taper on the inner peripheral surface of the annular packing 8'22 Taper on the outer peripheral surface of the annular packing 8'23 Circular groove 24 Rib 25 Slit 30,30 'Connecting fixed pipe 31,31' Connecting fixed pipe flange

Claims (2)

[Claims] 1. A taper flange that is connected to a flange of one of the connecting pipes is fixedly provided at one end, and has a diameter-expanded portion on the other side,
A flare pipe having a taper portion that expands outward at the tip of the enlarged diameter portion, and a flange is fixedly provided on the outer peripheral surface of the tapered portion, and one end portion is inserted into the enlarged diameter portion of the flare pipe, A dimension adjusting pipe having a flange fixedly provided at the other end, an annular packing having a wedge-shaped cross section, which is attached to the outer periphery of one end of the dimension adjusting pipe and is press-fitted inside the tapered portion of the flare tube, and the tapered portion of the flare tube. A loose flange that is fitted to the outer circumference of the dimension adjusting tube so as to face the flange on the outer peripheral surface and sandwiches the annular packing, a plurality of hinges arranged on the opposite side in the circumferential direction of the flange, and bolts and nuts for tightening them. ,
A plurality of hinges arranged in the circumferential direction of the flange of the dimension adjusting pipe and sandwiching the flange of the other connecting pipe and tightening with bolts and nuts; and a plurality of hinges and a plurality of hinges in the circumferential direction of the flare pipe flange. An expansion and contraction flexible tube joint including a plurality of tie rod bolts penetrating each other, and an expansion and contraction adjusting device that adjusts the size of the tie rod bolts on both sides of the hinges and tightens and fixes the hinges from both sides of each hinge. .. 2. The expansion / contraction flexible pipe joint according to claim 1, wherein the annular packing has an inner peripheral surface which is tapered so that the side press-fitted inside the tapered portion of the flare tube has a small diameter, and the outer peripheral surface. Of the flare pipe is press-fitted inside and the side is tapered at an angle larger than the taper angle of the flare pipe, and a plurality of arcuate grooves are equally divided in the circumferential direction of the end face on the smaller diameter side of the taper. The expansion and contraction flexible pipe joint is deeply provided substantially parallel to the taper and the slit is provided deeply in parallel with the taper of the inner peripheral surface between the end faces of the ribs formed between the arcuate grooves. ..