JP5869363B2 - Flexible pipe fittings - Google Patents

Description

  The present invention relates to a flexible pipe joint connected to a straight pipe without a flange.

  As an example, connection between a straight pipe without a flange and a pipe joint is provided on the inner surface of the end of the joint main body, a fastening bush having a male screw, an annular taper packing provided at the end thereof, as disclosed in Patent Document 1 below. With the female thread of the packing, with the taper surface of the packing in close contact with the internal taper surface of the joint body, rotating the tightening bush and screwing and fastening the male thread on the outer periphery to the female thread of the joint body Has been proposed.

JP-A-8-261371

The conventional connection structure between a straight pipe and a pipe joint has a drawback that the number of parts is large and the structure is complicated.
Further, according to the investigation by the present applicant, a highly reliable conventional technique for directly fastening and fixing a flexible pipe joint to a straight pipe has not been searched.
Therefore, an object of the present invention is to provide a highly reliable pipe joint that is simple in structure and easy to handle and can be connected to a straight pipe.

The present invention as set forth in claim 1 is a flexible pipe joint connected to an end of a pipe (1) having no flange.
A flexible joint body (3) formed in a cylindrical shape and integrally projecting a small flange portion (2) on the outer periphery of the axial end portion;
While sandwiching both axial planes of the small flange portion (2), the outer diameter is formed to be larger than the outer diameter of the small flange portion (2), and is positioned outside the outer periphery of the small flange portion (2). And an annular first phase flange (5) and a second phase flange (6) having a plurality of bolt holes (4) spaced apart in the circumferential direction,
The small flange portion (2) of the joint body (3) is internally provided with an annular rigid body (7) at its radial end.
The first phase flange (5) has an L-shaped contact on its axial end face that is in contact with the axial end face of the small flange portion (2) and a part of its radially outer peripheral end face in an L-shaped cross section. Has a contact (8),
The inner peripheral surface of the second phase flange (6) is fitted on the root of the small flange portion (2), and the axial end surface thereof is attached to the rigid body (7) of the small flange portion (2). In the aligned position, there is an annular second recess (12) wider than the radial thickness of the rigid body (7),
When the small flange portion (2) of the joint body (3) is clamped and fastened by the first phase flange (5) and the second phase flange (6), the second recessed portion (12 ) Bites into the flexible member near the outer periphery of the rigid body (7), deforms the small flange portion (2) to the center side in the radial direction, and the inner peripheral surface (13) of the joint body (3). ) Is press-contacted to the outer peripheral surface of the pipe (1) to form a liquid-tight joint between the contact portions of the pipe (1) and the joint body (3).

The present invention according to claim 2 is the flexible pipe joint according to claim 1,
The maximum diameter in the radial direction of the annular second recessed portion (12) matches the outer diameter of the small flange portion (2), and the L-shaped contact portion (8) of the first phase flange (5) When the small flange part (2) of the joint body (3) is clamped and fastened with the two-phase flange (6), the second recessed part (12) is configured to fit the outer peripheral surface of the small flange part (2) Flexible pipe joint.
According to a third aspect of the present invention, there is provided the flexible pipe joint according to the first or second aspect, wherein the first phase flange (5) or the third phase flange (23) adjacent thereto is provided with a pipe ( This is a flexible pipe joint provided with axial restraining means (22) which is engaged with the outer peripheral surface of 1) and prevents the first phase flange (5) from moving in the axial direction.

According to a fourth aspect of the present invention, in the flexible pipe joint according to the third aspect,
The axial direction restraining means (22) has a first recess (9) on the inner peripheral surface of the first phase flange (5), and the biting body (10) is radially arranged in the first recess (9). It is a flexible pipe joint that is movably mounted and has pressing means (11) that presses the biting body (10) toward the center in the radial direction.
The invention according to claim 5 is the flexible pipe joint according to claim 4,
The first recess (9) is annularly formed on the inner peripheral surface of the first phase flange (5),
In the first recess (9), a plurality of the biting bodies (10) that are spaced apart from each other in the circumferential direction, and a spacer (14) interposed between the biting bodies (10), Comprising
The biting body (10) is a laminate of a plurality of metal plate pieces (10a) having a substantially fan-shaped plane through a rubber plate (10b),
Flexibility that the biting body (10) is detachably pressed against the outer periphery of the pipe (1) by a bolt as the pressing means (11) screwed to the first phase flange (5) It is a pipe joint.
The invention according to claim 6 is the flexible pipe joint according to claim 3,
The axial restraining means (22) is provided with a wedge holding portion (24) on the inner peripheral surface of the third phase flange (23) adjacent to the first phase flange (5), and holds the wedge (21) there. Thus, it is a flexible pipe joint for fastening the wedge (21) to the outer peripheral surface of the pipe (1) by fastening the interphase flanges (6), (5) and (23).

The invention according to claim 7 is the flexible pipe joint according to claim 3,
The axial direction restraining means (22) is provided with a wedge holding portion (24) on the inner peripheral surface of the first phase flange (5), holding the wedge (21) therein, and the both phase flanges (6) (5 ) Is a flexible pipe joint that bites the wedge (21) to the outer peripheral surface of the pipe (1).
The invention according to claim 8 is the flexible pipe joint according to claim 7,
A rigid annular body (25) having a diameter larger than the maximum diameter of the wedge (21) is interposed between the end face of the wedge (21) and the end face of the small flange portion (2), and the annular body (25 ) Is a flexible pipe joint having an annular recess (26) aligned with the end face of the first phase flange (5).

When the small flange portion 2 of the joint body 3 is clamped and fastened by the first phase flange 5 and the second phase flange 6, the flexible pipe joint of the present invention has the second recessed portion 12 of the second phase flange 6. Bites into a flexible member near the outer periphery of the rigid body 7 and deforms the small flange portion 2 toward the center in the radial direction, so that the axial inner peripheral surface 13 of the joint body 3 is pressed against the outer peripheral surface of the pipe 1. Thus, there is an effect that the contact portion between the pipe 1 and the joint body 3 is formed in a liquid-tight manner.
In particular, the L-shaped contact portion 8 of the first phase flange 5 is fitted on the outer periphery of the small flange portion 2, and the small flange portion 2 is prevented from being deformed in the outer peripheral direction at the time of fastening. By deforming the portion 2 in the inner circumferential direction, the liquid tightness with the tube 1 can be reliably maintained.
Furthermore, when the second recessed portion 12 of the second phase flange 6 bites into a flexible member near the outer periphery of the rigid body 7 as shown in FIG. 2, the deformation of the small flange portion 2 is caused by the presence of the annular rigid body 7. The portion 19 is shaped, and the relative relationship between the first phase flange 5 and the second phase flange 6 is always kept constant, so that a highly stable pipe joint can be provided.

In the above configuration, when the maximum radial diameter of the second recessed portion 12 is matched with the outer peripheral diameter of the small flange portion 2 as described in claim 2, the L-shaped contact of the first phase flange 5 is achieved. The outer peripheral surface of the small flange portion 2 of the joint body 3 is fitted by the portion 8 and the second recessed portion 12 of the second phase flange 6 so that the deformed portion 19 of the small flange portion 2 does not spread outward in the radial direction. Can be suppressed.
Then, the stress associated with the distortion of the second recessed portion 12 is directed toward the center in the radial direction, and the inner peripheral surface 13 of the joint body 3 can be pressed against the outer periphery of the pipe 1 to ensure liquid tightness.
In the above configuration, as described in claim 3, the first phase flange 5 or the third phase flange 23 adjacent thereto is engaged with the outer peripheral surface of the pipe 1 so that the first phase flange 5 is axially disposed. When the axial direction restraining means 22 that is prevented from moving is provided, the liquid tightness can be more reliably ensured.

In the above configuration, as described in claim 4, as the axial direction restraining means 22, the first recess 9 is provided on the inner peripheral surface of the first phase flange 5, and the bite body 10 is placed in the first recess 9 in the radial direction. If the pressing means 11 that presses the bite body 10 toward the center in the radial direction is provided, the axial direction restraining means 22 becomes more effective.
In the above configuration, as described in claim 5, a plurality of metal plate pieces 10a each having a substantially fan-shaped plane are laminated via rubber plates 10b to form an occlusal body 10, and When the spacers 14 are arranged on the inner side of the tube 1 and the respective biting bodies 10 are pressed by the pressing means 11 made of bolts, the outer periphery of the tube 1 is adjusted by the rubber material present in the middle, and the outer periphery of the tube 1 is damaged. Can be prevented as much as possible.
Thereby, a highly durable flexible pipe joint can be provided.
In the above configuration, as described in claim 6, as the axial direction restraining means 22, the wedge holding portion 24 is provided on the inner peripheral surface of the third phase flange 23 adjacent to the first phase flange 5, and the wedge 21 is provided there. By holding and fastening the interphase flanges 6, 5, and 23, when the wedge 21 is bitten on the outer peripheral surface of the pipe 1, the axial direction restraining means 22 becomes more effective.

According to the seventh aspect of the present invention, the wedge holding portion 24 is provided on the inner peripheral surface of the first phase flange 5, the wedge 21 is held there, and the wedges are clamped between the two phase flanges 6 and 5, thereby the wedge. This is a flexible pipe joint that bites 21 to the outer peripheral surface of the pipe 1. In this case, the overall structure is simplified, and the flexible pipe joint is easy to handle.
According to an eighth aspect of the present invention, in the flexible pipe joint according to the seventh aspect, between the end surface of the wedge 21 and the end surface of the small flange portion 2, a rigid annular body having a larger diameter than the maximum diameter of the wedge 21. 25 is a flexible pipe joint in which an annular recessed portion 26 that is fitted to the annular body 25 is formed on the end face of the first phase flange 5. In this case, it is possible to prevent the small flange portion 2 of the flexible pipe joint from being damaged at the end face of the wedge 21.

It is a longitudinal cross-sectional view parallel to the axis | shaft of the pipe joint of this invention, Comprising: The state before fastening is shown. The state after the fastening is shown. The front view and BB arrow sectional drawing of the 2nd phase flange 6 used for the joint. The front view and BB arrow sectional drawing of the 1st phase flange 5 used for the joint. The perspective view which shows the fastening state of the joint. The axis right angle sectional view and BB arrow sectional view showing other examples of the 1st phase flange 5 of the joint of the present invention. It is a longitudinal cross-sectional view parallel to the axis | shaft of the other pipe joint of this invention, Comprising: The state before fastening is shown. It is a longitudinal cross-sectional view parallel to the axis | shaft of the other pipe joint of this invention, Comprising: The state before fastening is shown. The front view and sectional drawing of the wedge 21 used for the pipe joint.

Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1, 2, and 5, the flexible pipe joint of the present invention includes a flexible joint body 3 having a pair of small flange portions 2 at both ends in the axial direction, and a metal first phase flange. 5 and the second phase flange 6.
The joint body 3 is made of a rubber material as a flexible material, and an annular rigid body 7 made of a metal material is embedded in the radially outer peripheral end portion of the small flange portion 2. The cross section of the rigid body 7 is formed in a rectangular shape, and its long side is positioned in parallel with the outer peripheral surface of the small flange portion 2. A tire cord 15 is embedded in the joint body 3 including the outer periphery of the rigid body 7.

  The first phase flange 5 and the second phase flange 6 sandwich both the flat surfaces of the small flange portion 2 of the joint body 3 and have outer diameters larger than the outer diameter of the small flange portion 2. A plurality of bolt holes 4 are spaced apart in the circumferential direction at positions outside the portion 2. The 1st phase flange 5 has the 1st recessed part 9 which consists of an annular groove in the internal peripheral surface, and the biting body 10 is incorporated in the 1st recessed part 9 so that a movement to a radial direction is possible. The biting body 10 is pressed toward the center in the radial direction by pressing means 11 made of a bolt in this example. That is, the pressing means 11 is screwed into the plurality of screw holes 20 provided on the outer periphery of the first phase flange 5, and the tip thereof presses the bite body 10 toward the center side.

The bite body 10 is formed in an arc shape whose tip plane is aligned with the outer periphery of the tube 1, and the tip of the cross section projects in a claw shape, and the claw portion bites the outer surface of the tube 1. Thereby, the first phase flange 5 is positioned so as not to move in the axial direction with respect to the pipe 1. The biting body 10 and the pressing means 11 constitute the axial direction restraining means 22 of the present invention.
An annular L-shaped contact portion 8 having an L-shaped cross section is recessed on one side surface of the first phase flange 5. The inner peripheral surface of the L-shaped contact portion 8 is aligned with the one end surface and the outer peripheral surface of the small flange portion 2 of the joint body 3. Note that the depth of the L-shaped contact portion 8 is formed to be smaller than the width of the small flange portion 2.

  Next, the second phase flange 6 has a second recessed portion 12 formed of an annular groove at a position facing the rigid body 7 on one end face thereof. The groove width of the second recessed portion 12 is larger than the thickness of the rigid body 7, and the maximum radial diameter of the second recessed portion 12 is equal to the maximum diameter of the small flange portion 2. The second recessed portion 12 faces the first phase flange 5.

(Function)
The joint body 3, the first phase flange 5, and the second phase flange 6 thus constructed are fitted on the outer periphery of the pipe 1 made of a straight pipe without a flange, as shown in FIG. Then, the pressing means 11 of the first phase flange 5 is screwed into the screw hole 20, the tip presses the bite body 10 toward the radial center, and the tip edge bites the tube 1.
Further, the pair of first phase flange 5 and second phase flange 6 are fastened and fixed in the axial direction by a plurality of bolts 17 (four in this example), nuts 18 and washers 16. Then, as shown in FIG. 2, the flexible material made of a rubber material in the vicinity of the rigid body 7 is crushed, and the deformed portion 19 enters the second recessed portion 12.

At this time, the outer peripheral surface of the small flange portion 2 is held by the L-shaped abutting portion 8 of the first phase flange 5 and the inner wall of the maximum diameter of the second recessed portion 12, and the small flange portion 2 is deformed to the outer periphery in the radial direction. To prevent. Then, along with the crushing, the small flange portion 2 is deformed to the inner peripheral surface side, and the inner peripheral surface 13 and the tube 1 are pressure-bonded to ensure liquid tightness. In this example, as shown in FIG. 5, a pair of a first phase flange 5 and a second phase flange 6 are disposed at both ends of the joint body 3.
Note that one side of the joint body 3 can be connected to a pipe 1 with a flange.

Next, FIG. 6 shows another example of the first phase flange 5, and this example is different from that of FIGS. 1, 2, and 4 in the bite body 10 and the spacer 14.
The biting body 10 is composed of a plurality of metal plate pieces 10a having a substantially fan-shaped plane and a rubber plate 10b connecting the metal plate pieces 10a. In this example, a spacer 14 is interposed between the three biting bodies 10. The spacers 14 position the three bites 10 in the circumferential direction. Then, by screwing the pressing means 11 into the screw hole 20, each biting body 10 is pressed toward the center in the radial direction, and the metal plate piece 10 a is bitten on the outer periphery of the tube 1. At this time, the tip of each metal plate piece 10a is evenly fastened to the outer periphery of the tube 1 by the elastic action of the rubber plate 10b.

  Next, FIG. 7 shows another example of the axial direction restraining means 22 of the present invention. This example is different from that of FIG. 1 in that the inner peripheral surface of the third phase flange 23 adjacent to the first phase flange 5 is used. The wedge holding portion 24 is provided as an inclined inclined surface, and a wedge 21 having a back aligned with the inclined surface is held there, and the wedges 21 are fastened by fastening the interphase flanges 6, 5, 23. It is pressed in the axial direction and bites it on the outer peripheral surface of the tube 1.

  Next, FIG. 8 shows another example of the axial direction restraining means 22 of the present invention, in which the first phase flange 5 has a wedge holding portion 24 and the wedge holding portion 24 holds the wedge 21. At the same time, an annular body 25 is interposed between the wedge 21 and the small flange portion 2. The annular body 25 is made of a thick ring plate and has an outer diameter larger than the maximum diameter of the wedge 21. Further, an annular recess 26 is provided in the first phase flange 5 so as to be aligned with the annular body 25. The annular body 25 is interposed between the end faces of the wedge 21 so that the end face of the wedge 21 is not damaged. And a pipe joint is fastened and fixed by fastening between the 1st phase flange 5 and the 2nd phase flange 6 with the volt | bolt 17 and the nut 18. FIG. By comprising in this way, the whole structure of a joint is simplified, the fastening is easy, and it can fasten rapidly.

In addition, as shown in FIG. 9, the wedge 21 is configured so that it can be reduced in the radial direction by cutting out a part of a circle in the front view.
According to the experiment by the present inventor, when the flexible pipe joint and the pipe 1 are fastened and fixed by the structure of FIG. 8, the fastening state is not different from that in FIG. That is, the embodiment of FIG. 7 and the embodiment of FIG. 8 are equivalent in the fastening structure.

DESCRIPTION OF SYMBOLS 1 Pipe 2 Small flange part 3 Joint main body 4 Bolt hole 5 1st phase flange 6 2nd phase flange 7 Rigid body 8 L-shaped contact part 9 1st recessed part

10 bite body
10a Metal plate
10b rubber plate
11 Pressing means
12 Second recess
13 Inner peripheral surface
14 Spacer
15 Tire cord
16 Washer
17 volts

18 nuts
19 Deformation part
20 Screw holes
21 wedges
22 Axial restraint
23 Third phase flange
24 Wedge holder
25 toroids
26 Annular recess

Claims (8)

In the flexible pipe joint connected to the end of the pipe (1) without the flange,
A flexible joint body (3) formed in a cylindrical shape and integrally projecting a small flange portion (2) on the outer periphery of the axial end portion;
While sandwiching both axial planes of the small flange portion (2), the outer diameter is formed to be larger than the outer diameter of the small flange portion (2), and is positioned outside the outer periphery of the small flange portion (2). And an annular first phase flange (5) and a second phase flange (6) having a plurality of bolt holes (4) spaced apart in the circumferential direction,
The small flange portion (2) of the joint body (3) is internally provided with an annular rigid body (7) at its radial end.
The first phase flange (5) has an L-shaped contact on its axial end face that is in contact with the axial end face of the small flange portion (2) and a part of its radially outer peripheral end face in an L-shaped cross section. Has a contact (8),
The inner peripheral surface of the second phase flange (6) is fitted on the root of the small flange portion (2), and the axial end surface thereof is attached to the rigid body (7) of the small flange portion (2). In the aligned position, there is an annular second recess (12) wider than the radial thickness of the rigid body (7),
When the small flange portion (2) of the joint body (3) is clamped and fastened by the first phase flange (5) and the second phase flange (6), the second recessed portion (12 ) Bites into the flexible member near the outer periphery of the rigid body (7), deforms the small flange portion (2) to the center side in the radial direction, and the inner peripheral surface (13) of the joint body (3). ) Are in pressure contact with the outer peripheral surface of the pipe (1), so that a liquid-tight space is formed between the contact portions of the pipe (1) and the joint body (3). The flexible pipe joint according to claim 1, wherein
The maximum diameter in the radial direction of the annular second recessed portion (12) matches the outer diameter of the small flange portion (2), and the L-shaped contact portion (8) of the first phase flange (5) When the small flange part (2) of the joint body (3) is clamped and fastened with the two-phase flange (6), the second recessed part (12) is configured to fit the outer peripheral surface of the small flange part (2) Flexible pipe fittings. In the flexible pipe joint according to claim 1 or 2,
The first phase flange (5) or the third phase flange (23) adjacent thereto is engaged with the outer peripheral surface of the pipe (1) so that the first phase flange (5) does not move in the axial direction. A flexible pipe joint provided with axial restraint means (22). The flexible pipe joint according to claim 3,
The axial direction restraining means (22) has a first recess (9) on the inner peripheral surface of the first phase flange (5), and the biting body (10) is radially arranged in the first recess (9). A flexible pipe joint that is movably mounted and has pressing means (11) that presses the biting body (10) toward the center in the radial direction. The flexible pipe joint according to claim 4,
The first recess (9) is annularly formed on the inner peripheral surface of the first phase flange (5),
In the first recess (9), a plurality of the biting bodies (10) that are spaced apart from each other in the circumferential direction, and a spacer (14) interposed between the biting bodies (10), Comprising
The biting body (10) is a laminate of a plurality of metal plate pieces (10a) having a substantially fan-shaped plane through a rubber plate (10b),
Flexibility that the biting body (10) is detachably pressed against the outer periphery of the pipe (1) by a bolt as the pressing means (11) screwed to the first phase flange (5) Pipe fittings. The flexible pipe joint according to claim 3,
The axial restraining means (22) is provided with a wedge holding portion (24) on the inner peripheral surface of the third phase flange (23) adjacent to the first phase flange (5), and holds the wedge (21) there. A flexible pipe joint for fastening the wedge (21) to the outer peripheral surface of the pipe (1) by fastening the interphase flanges (6), (5) and (23). The flexible pipe joint according to claim 3,
The axial direction restraining means (22) is provided with a wedge holding portion (24) on the inner peripheral surface of the first phase flange (5), holds the wedge (21) therein, and the both phase flanges (6) (5 ), The flexible pipe joint that bites the wedge (21) to the outer peripheral surface of the pipe (1). The flexible pipe joint according to claim 7,
A rigid annular body (25) having a diameter larger than the maximum diameter of the wedge (21) is interposed between the end face of the wedge (21) and the end face of the small flange portion (2), and the annular body (25 ) A flexible pipe joint in which an annular recess (26) matching with the first phase flange (5) is formed.

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