JPH10311469A - Loose flange type pipe coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow to obtain a high sealing property by contraction deforming an elastic seal ring adequately in the whole periphery in the peripheral direction, even though the respective cross sections of one side pipe and the other side pipe are the pipes other than a normal circular pipe. SOLUTION: To the end of one side pipe 1, plural blind insertion screw holes 11, 11... are formed from the outer side, along the surface orthogonal to the pipe axis at a specific interval in the peripheral direction, a loose flange 2 in which plural long holes 12, 12... corresponding to the blind penetration screw holes 11 are penetrated at the lateral extensions 2C is provided, and fitted from the outer side to the end of one side pipe 1, bolts 13, 13... are screwed to the blind insertion screw holes 11, 11... from the outer side along the surface orthogonal to the pipe axis through the long holes 12, 12... so as to fasten, and at the same time, the loose flange 2 and the other side flange 7 are fastened by plural bolts and nuts 8, 8..., while one side flange 9 and the other side flange 7 are fastened by plural long size bolts and nuts 10. 10....

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a loose flange type pipe joint.

[0002]

2. Description of the Related Art Conventionally, a loose flange type pipe joint has been frequently used as a pipe joint convenient for installation or disassembly of a pump or a valve. This type of loose flange type pipe fitting is
It is configured as shown in FIG. That is, the loose flange 2 is externally fitted to the end of the one-side tube 1 so as to be freely movable in the axial direction of the tube, and the inner periphery of the loose flange 2 on the flange surface 2A side extends from the flange surface 2A side to the back. A tapered seal member pressing surface 3 whose diameter gradually decreases is formed. An O-ring 4 formed of an elastic material such as rubber is externally fitted to an end of the one-side tube 1 corresponding to the tapered seal member pressing surface 3, and one end surface 5A in the axial direction is an O-ring. A collar 5 which faces the ring 4 and the flange 2A surface of the loose flange 2 and whose other end surface 5B in the axial direction faces the flange surface 7A of the other flange 7 provided at the end of the other tube 6; I have. In the figure, reference numeral 15 denotes a gasket.

The loose flange 2 and the other-side flange 7 are fastened to each other by first fastening members 8, 8,... Comprising a plurality of bolts and nuts penetrated at predetermined intervals in the circumferential direction. In addition, one side pipe 1 is located on the back side of the loose flange 2.
Are provided with a predetermined interval in the circumferential direction and penetrated between the plurality of first fastening members 8, 8... The second consisting of multiple long bolts and nuts
Are fastened to each other by fastening members 10, 10,....

[0004] In order to obtain high sealing performance with the loose flange type pipe joint constructed as described above, the O-ring 4 is appropriately compressed and deformed, and the reaction force of the O-ring 4 at this time causes the loose flange 2 and one side. It is used when the side tube 1 does not excessively deform and has a tube shape or a member rigidity.

[0005] As shown in FIG. 11, if the cross section of each of the one side pipe 1 and the other side pipe 6 is a round pipe having a perfect circular shape, and if the loose flange 2 is also a round shape, it is natural that the entire circumference with respect to the pipe axis. Have a symmetrical shape, the reaction force of the O-ring 4 due to the tightening of the first fastening members 8, 8,... Is uniformly maintained over the entire circumference in the circumferential direction, and a high sealing property can be obtained. However, as shown in FIG. 12, the cross section of the one-side tube 1 is, for example, a thin rectangular square tube, and the loose flange 2, the collar 5 (not shown) and the other-side tube 6 naturally have a thin rectangular shape. In the case of a pipe joint, since the entire circumference is not symmetrical with respect to the pipe axis, the rigidity in the width direction of the thin rectangular cross section is low, so that the height in the height direction when the first fastening members 8, 8. As shown in FIG. 13, the amount of deflection increases toward the center in the width direction. In particular, since the one-side tube 1 is thin, the amount of deflection is larger than that of the loose flange 2 and excessively deforms. For this reason, the O-ring 4 cannot be appropriately compressed and deformed at and near the widthwise central portion where the amount of deflection is large. Therefore, in the case of a tube having a non-circular cross-sectional shape such as a thin rectangular square tube, it is not possible to obtain a high sealing property in which the O-ring 4 is appropriately compressed and deformed in the entire circumferential direction.

FIG. 14 shows another example. This type of loose-flange type pipe joint has a loose flange 2 fitted to the end of one side pipe 1 so as to be freely movable in the axial direction of the pipe, and a tip end of the loose pipe 2 on the one side pipe 1 which is located outside. An O-ring 4 fitted in an annular groove 14 recessed in the outer peripheral portion at a position closer to the side, and one end surface in the axial direction which is fitted over the O-ring 4 and externally fitted to the end of the one-side tube 1 A collar 5 that abuts against the flange surface 2A of the loose flange 2 and the other end surface 5B in the axial direction faces the flange surface 7A of the other flange 7 provided at the end of the other tube 6; The loose flange 2 and the other-side flange 7 are fastened to each other by first fastening members 8, 8,... Formed by a plurality of bolts and nuts penetrating at predetermined intervals in the circumferential direction. One side provided on one side tube 1 on the back side A plurality of long bolts and nuts having a predetermined spacing in the circumferential direction between a flange 9 or a bracket (not shown) and the other side flange 7 and penetrating between the plurality of first fastening members 8, 8,. Second fastening members 10 and 1 made of
0 ... are mutually fastened.

In order to obtain high sealing performance with the loose flange type pipe joint constructed as described above, the O-ring 4 is appropriately compressed and deformed, and the reaction force of the O-ring 4 at this time causes the collar 5 and one side. It is used when a tube shape or member rigidity that does not excessively deform the tube 1 is obtained.

As shown in FIG. 14, each of the one-side tube 1 and the other-side tube 6 is a round tube having a perfect circular cross section. Due to the symmetrical shape, the reaction force of the O-ring 4 can be maintained uniformly over the entire circumference in the circumferential direction, and high sealing performance can be obtained. However, if the cross section of the one-side tube 1 is, for example, a thin rectangular rectangular tube, and the collar 5 and the other-side tube 6 (not shown) are loose-flange type pipe joints having a thin rectangular shape, of course, the tube shaft is Since the entire circumference is not a symmetrical shape, the rigidity in the width direction of the thin rectangular cross section is low, so that the amount of deflection in the height direction increases toward the center in the width direction. In particular, since the one side tube 1 is thin, the amount of deflection is larger than that of the collar 5 and excessively deforms. For this reason, the O-ring 4 cannot be appropriately compressed and deformed at and near the widthwise central portion where the amount of deflection is large. Therefore, in the case of a tube having a non-circular cross-sectional shape such as a thin rectangular square tube, it is not possible to obtain a high sealing property in which the O-ring 4 is appropriately compressed and deformed in the entire circumferential direction.

[0009]

That is, in a conventional loose-flange type pipe joint, when the cross-section of each of the one-side pipe and the other-side pipe is other than a perfect circle, the rigid seal is formed by the compressive deformation reaction force of the elastic seal ring. The amount of deflection in the lower width direction central portion and its vicinity is large and excessively deformed, and the elastic seal ring cannot be appropriately compressed and deformed in the width direction central portion and its vicinity where the deflection amount is large, and the entire circumferential direction of the elastic seal ring cannot be deformed. It is not possible to obtain a high sealing property by appropriately compressing and deforming the elastic seal ring. Therefore, the present invention can obtain a high sealing property by appropriately compressing and deforming the elastic seal ring in the entire circumferential direction even if the cross-section of each of the one-side pipe and the other-side pipe is a pipe other than a perfect circle. It is an object of the present invention to provide a loose flange type pipe joint that can be used.

[0010]

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the one-sided tube is fitted to the end of the one-sided tube so as to be freely movable in the axial direction of the tube, and the flange surface side. A loose flange having a tapered seal member pressing surface formed on an inner peripheral portion thereof; an elastic seal ring externally fitted to an end of the one-side tube corresponding to the tapered seal member pressing surface; The other side flange which is externally fitted to the end of the tube, one end surface in the axial direction abuts against the flange surface of the elastic seal ring and the loose flange, and the other end surface in the axial direction is provided at the end of the other side tube. A collar which directly or indirectly abuts the flange surface of the loose flange and the other flange are fastened to each other by a plurality of first fastening members penetrated at predetermined intervals in a circumferential direction, and At the back of the loose flange A plurality of second fastening members having a predetermined spacing in a circumferential direction between one flange or bracket provided on the one side pipe and the other flange and being inserted between the plurality of first fastening members. A loose flange type pipe joint fastened to each other, wherein the loose flange is fastened to the end of the one side pipe from outside along a plane perpendicular to the pipe axis by a plurality of third fastening members. It is characterized by. Further, the invention according to claim 2 is characterized in that a loose flange externally fitted to the end of the one-sided pipe so as to be freely movable in the axial direction of the pipe and a tip end side of the one-sided pipe relative to an outer fitting position of the loose flange. An elastic seal ring fitted in an annular groove recessed in an outer peripheral portion at a shifted position, and an outer end fitted in the end of the one-side tube so as to cover the elastic seal ring so that one end surface in the axial direction is loose. A collar abutting against the flange surface of the flange, and the other end surface in the axial direction directly or indirectly abutting against the flange surface of the other flange provided at the end of the other tube; A plurality of first fastening members that penetrate the side flange at a predetermined interval in a circumferential direction and fasten each other, and a one-side flange or a bracket provided on the one-side tube at a depth side of the loose flange And the other A loose flange type pipe joint which has a predetermined distance in a circumferential direction with a side flange and is fastened to each other by a plurality of second fastening members penetrated between the plurality of first fastening members; Are fastened to the end of the one-sided pipe from outside along a plane perpendicular to the pipe axis by a plurality of third fastening members.

According to the first aspect of the present invention, a plurality of third
By fastening the loose flange to the end of the one-sided pipe from the outside along the surface orthogonal to the pipe axis of the one-sided pipe by the fastening member, the cross-section of each of the one-sided pipe and the other-sided pipe is a pipe other than a perfect circle. Even so, the excessive deformation of the one-side tube and the loose flange due to the compression deformation reaction force of the elastic seal ring can be suppressed, so that the elastic seal ring can be appropriately compressed and deformed over the entire circumference in the circumferential direction. According to the second aspect of the present invention, the collar is fastened to the end of the one-side tube from the outside along the plane perpendicular to the tube axis of the one-side tube by the plurality of third fastening members, so that the one-side tube is connected to the one-side tube. Even if the cross-section of each of the other side tubes is a tube other than a perfect circle, excessive deformation of the one side tube and the collar due to the compressive deformation reaction force of the elastic seal ring can be suppressed. The seal ring can be appropriately compressed and deformed.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; 1 is a plan view of an assembled state, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG.
FIG. 4 is a cross-sectional view taken along line B. Note that the same or corresponding parts as those in the conventional example of FIGS. 11 to 13 are denoted by the same reference numerals and described. 1 to 3, a square loose flange 2 is fitted to the end of one side tube 1 formed of a thin rectangular rectangular tube so as to freely move in the tube axial direction, and a flange surface 2A of the loose flange 2 is provided. A tapered seal member pressing surface 3 whose diameter gradually decreases from the flange surface 2A side to the inner part is formed on the inner peripheral portion on the side. An O-ring 4 formed of an elastic material such as rubber is externally fitted to the end of the one-side tube 1 corresponding to the tapered seal member pressing surface 3, and one end surface 5 </ b> A in the axial direction is an O-ring. The ring 4 contacts the flange 2A surface of the loose flange 2, and the other axial end surface 5B contacts the flange surface 7A of the other flange 7 provided at the end of the other tube 6 via the gasket 15. And a square collar 5.

The loose flange 2 and the other side flange 7 are fastened to each other by first fastening members 8, 8,... Comprising a plurality of bolts and nuts inserted at a predetermined interval in a circumferential direction. In addition, one side pipe 1 is located on the back side of the loose flange 2.
Are provided at a predetermined interval in the circumferential direction and are inserted between the plurality of first fastening members 8, 8,... The second consisting of multiple long bolts and nuts
Are fastened to each other by the fastening members 10, 10,....

The end of the one side tube 1 is formed to be slightly thicker, and a plurality of blind through-holes 11 are formed from the outside along a plane perpendicular to the tube axis at predetermined intervals in the circumferential direction of the thicker portion. , 11 ... are formed. Also, as shown in FIGS. 4 and 5,
In the laterally extending portion 2C of the rectangular loose flange 2, a plurality of elongated holes 12, extending in the tube axis direction of the one-side tube 1 with circumferential intervals corresponding to the plurality of blind threaded holes 11, 11,. 1
Are provided through a plurality of bolts which are screwed into the plurality of blind through-holes 11 from the outside along a plane orthogonal to the tube axis through the plurality of long holes 12, 12 .... Are provided.

In the above configuration, the original shape before assembly is the same as the conventional example (see FIG. 12). Third fastening member 13, 1
3 and the tightening forces of the plurality of first fastening members 8, 8,..., While the first fastening members 8, 8,. , 13... Are properly fastened, as shown in FIGS.
Excessive deformation of the one-side tube 1 and the loose flange 2 due to the compressive deformation reaction force of the O-ring 4 can be suppressed, so that the O-ring 4 is appropriately compressed and deformed over the entire circumferential direction, and high sealing performance is obtained. Obtainable.

Next, an embodiment of the present invention will be described with reference to the drawings. 6 is a plan view of the assembled state, FIG. 7 is a cross-sectional view taken along line CC of FIG. 6, and FIG. 8 is a line DD of FIG.
It is a line sectional view. The same or corresponding parts as those of the first aspect are denoted by the same reference numerals and described. 6 to 8, a square loose flange 2 is externally fitted to the end of one side tube 1 formed of a thin rectangular rectangular tube so as to be movable in the tube axis direction. On the other hand, the end of the side tube 1 is formed to be slightly thicker, and an annular groove 14 is recessed in an outer peripheral portion of the thicker portion at a position closer to the distal end side than the outer fitting position of the loose flange 2. The O-ring 4 is fitted around the entire circumference of the annular groove 14. Further, a plurality of blind through-holes 11, 11... Are formed from the outside along a plane perpendicular to the pipe axis at a predetermined interval in the circumferential direction adjacent to the inner side of the annular groove 14. Further, the O-ring 4 is fitted over the end of the one-side tube 1 so as to be fitted over the end of the one-side tube 1, and one end surface 5 </ b> A in the axial direction comes into contact with the flange 2 </ b> A surface of the loose flange 2, and the other end surface 5 </ b And a rectangular collar 5 that abuts against a flange surface 7A of the other-side flange 7 provided at an end of the other-side tube 6.

As shown in FIGS. 9 and 10, a plurality of collars 5 extend in the tube axis direction of the one-side tube 1 at circumferential intervals corresponding to the plurality of blind threaded holes 11, 11,. Are formed through the plurality of long holes 12, 12,.
.. Are provided with a plurality of bolts screwed into the plurality of blind threaded holes 11, 11... From the outside along a plane orthogonal to the pipe axis via.

In the above configuration, the original form before assembly is the same as the conventional example (see FIG. 12). Third fastening member 13,
.. While adjusting the tightening force of the first fastening members 8, 8... While adjusting the tightening force of the plurality of first fastening members 8, 8,. , 13... Can be suppressed from excessively deforming the one-side tube 1 and the collar 5 due to the compressive deformation reaction force of the O-ring 4 as shown in FIGS. The O-ring 4 can be appropriately pressed against the inner surface of the collar 5 in the entire circumferential direction to obtain high sealing properties.

In the embodiment of the invention described in claim 1 or claim 2, a loose-flange type pipe joint in which each of the one-side tube 1 and the other-side tube 6 is applied to a thin rectangular rectangular tube. Although described, the present invention is not limited to only the above-described embodiment, and is similar to each of the above-described embodiments even when applied to, for example, an elliptical tube or an oval tube having a cross section other than a perfect circle. The effect of the invention can be obtained. Of course, it goes without saying that the present invention can be applied to a round pipe having a circular cross section.

[0020]

As described above, according to the first aspect of the present invention, the loose flange is formed by the plurality of third fastening members from the outside along the plane perpendicular to the pipe axis of the one-side pipe and the end of the one-side pipe. Even if the cross-section of each of the one-side tube and the other-side tube is a tube other than a perfect circle, excessive deformation of the one-side tube and the loose flange due to the compressive deformation reaction force of the elastic seal ring is suppressed. Therefore, the elastic seal ring can be appropriately compressed and deformed over the entire circumference in the circumferential direction, and high sealing performance can be obtained. According to the second aspect of the present invention, the collar is fastened to the end of the one-side tube from the outside along a plane perpendicular to the tube axis of the one-side tube by a plurality of third fastening members. Even if the cross-section of each of the other side tubes is a tube other than a perfect circle, excessive deformation of the one side tube and the collar due to the compressive deformation reaction force of the elastic seal ring can be suppressed. High sealing performance can be obtained by appropriately compressing and deforming the seal ring.

[Brief description of the drawings]

FIG. 1 is a plan view of an assembled state showing one embodiment of the invention described in claim 1;

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

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a plan view of a loose flange used in the first aspect of the present invention.

FIG. 5 is a side view of a loose flange used in the first aspect of the present invention.

FIG. 6 is a plan view of an assembled state showing one embodiment of the invention described in claim 2;

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a sectional view taken along line DD of FIG. 6;

FIG. 9 is a plan view of a collar used in the second aspect of the present invention.

FIG. 10 is a side view of a collar used in the invention described in claim 2;

FIG. 11 is a half sectional view showing an example of a conventional loose flange type pipe joint.

FIG. 12 is an explanatory front view showing a relationship before assembling a square tube and a square loose flange.

FIG. 13 is an explanatory front view showing a state in which an elastic seal ring is bent by a compression reaction force.

FIG. 14 is a half sectional view showing another example of the conventional loose flange type pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 One side pipe 2 Loose flange 2A Loose franc diflange surface 3 Tapered seal member pressing surface 4 O-ring (elastic seal ring) 5 Collar 5A One axial end face of collar 5B The other axial end face of collar 6 Other side pipe 7 Other side flange 7A Flange surface of other side flange 8 First fastening member 9 One side flange 10 Second fastening member 13 Third fastening member

Claims (2)

[Claims] A loose flange having a tapered sealing member pressing surface formed on an inner peripheral portion of a flange surface side, the loose flange being fitted to an end portion of the one side tube so as to be freely movable in a tube axial direction;
An elastic seal ring externally fitted to an end of the one-sided pipe corresponding to the tapered sealing member pressing surface; and an elastic seal ring externally fitted to an end of the one-sided pipe and having one end face in the axial direction. And a collar abutting against the flange surface of the loose flange, and the other end surface in the axial direction directly or indirectly abutting against the flange surface of the other flange provided at the end of the other pipe, And the other side flange are fastened to each other by a plurality of first fastening members penetrated at a predetermined interval in the circumferential direction, and the one side flange provided on the one side pipe at the back side of the loose flange. Alternatively, a loose-flange type pipe joint comprising a plurality of second fastening members having a predetermined interval in a circumferential direction between the bracket and the other side flange and being fastened to each other by a plurality of second fastening members inserted between the plurality of first fastening members. There Loose flange type fitting which is characterized in that it is fastened from the outside along a plane perpendicular to the tube axis to an end of the one side pipe by the third fastening member and the loose flange is plural. 2. A loose flange externally fitted to the end of the one-sided pipe so as to be freely movable in the axial direction of the pipe, and an outer periphery of the one-sided pipe at a position closer to the distal end side than the externally fitted position of the loose flange. An elastic seal ring fitted in an annular groove recessed in the portion, and an outer end fitted to the end of the one-side tube so as to cover the elastic seal ring, and one end surface in the axial direction is formed on the flange surface of the loose flange. A collar that abuts the other end surface in the axial direction and directly or indirectly abuts the flange surface of the other flange provided at the end of the other tube, and surrounds the loose flange and the other flange. One side flange or bracket and the other side flange provided on the one side tube at the back side of the loose flange, while being fastened to each other by a plurality of first fastening members inserted at predetermined intervals in the direction. And A loose flange type pipe joint having a predetermined interval in a circumferential direction and being fastened to each other by a plurality of second fastening members penetrated between the plurality of first fastening members, wherein the collar has a plurality of first fastening members. (3) A loose-flange type pipe joint characterized in that the pipe is fastened to the end of the one-side pipe from outside along a plane orthogonal to the pipe axis by three fastening members.