JP5132994B2 - Flexible pipe fittings - Google Patents

Description

  The present invention relates to a pipe joint. In particular, the present invention relates to a flexible pipe joint having flexibility.

  Conventionally, a flexible pipe joint is used for a portion where a piping path is bent, such as a water supply piping line laid in a building or various facilities, or a pipe attachment part to equipment. In general, the flexible pipe joint is generally made of a flexible material having elasticity such as rubber in order to absorb the stress due to the displacement of the ground due to an earthquake or ground subsidence. Further, in the flexible pipe joint, the outer periphery of the axial cross section of the pipe body may be formed in a normal waveform (bellows shape) in order to increase flexibility. Furthermore, when pressure resistance is required, tire cords such as nylon and polyester, or metal wires may be embedded in the pipe body as reinforcing fibers for preventing rupture and the like.

  By the way, such flexible pipe joints are usually prepared in various lengths in accordance with the situation of the site at the time of construction, and those suitable for the abutting dimensions of the pipes are used. . However, depending on the situation at the site, pipe fittings with existing dimensions may not be compatible. For example, it is a case where the length of the pipe joint is too long or too short to match the butt dimension of the pipes. In particular, in pipe repair work, etc., buried in the ground, it is difficult to shift and adjust the pipe itself, so the butt dimension between the pipes must be measured and a joint commensurate with the length must be produced. There was a case.

On the other hand, there is disclosed a dimension-adjustable pipe joint that is attached between both ends butted connection pipes of a connection partner and can be adjusted in the length direction and the rotation direction (for example, see Patent Document 1).
JP-A-8-4961

  However, the pipe joint disclosed in Patent Document 1 has a problem in that it is costly because there are many components. Moreover, since it used using the structural member for dimension adjustment, the flexibility as a pipe joint might be impaired.

  The present invention has been made in view of the problems as described above. The dimensions of the flexible tube body can be easily adjusted, and the pipes can be reliably connected without impairing the flexibility. An object of the present invention is to provide a flexible pipe joint.

  In order to solve the above problems, the inventor uses a connecting member to connect a pair of flanges provided at both ends of the flexible pipe joint with the connecting member, and adjusts the length of the connecting member between the flanges. As a result, it was found that the flexible pipe joint can be adjusted to a predetermined length, and the present invention has been completed. Specifically, the following flexible pipe joint is provided.

  (1) A flexible pipe joint for connecting pipes whose ends are opposed to each other, each having a substantially cylindrical flexible pipe body and both ends of the flexible pipe body. A pair of flanges connected to the ends of the pipes facing each other; and a connecting member that connects the flanges, the connecting members being detachably connected to the flanges and protruding in opposite directions. And a plurality of rod-shaped members that are arranged in the axial direction of the flexible pipe joint and have male screw portions formed at least at both ends, and the protruding pieces connected to the flanges are respectively The protruding pieces of the flanges are arranged so as to face each other, and an insertion hole through which the rod-like member can be inserted is provided. While inserting the male screw portion into the insertion hole, the flexible pipe joint to be screwed by a fastening nut.

  (2) The flexible pipe joint is formed integrally with the flexible pipe main body, and includes a seal portion that extends to a flange surface that comes into contact with a mating pipe, and the protruding piece is formed on the flange surface side. The axial thickness of the flexible pipe joint connected to the flange is formed thinner than the thickness from the flange surface to the axial end of the seal portion ( The flexible pipe joint according to 1).

  (3) The seal portion is formed in a substantially cylindrical shape on the flange surface, and the protruding piece is disposed on the flange surface so as to contact the outer peripheral surface of the seal portion. Flexible pipe fittings.

(4) A flexible pipe joint for connecting pipes whose ends are arranged to face each other,
A substantially cylindrical flexible tube main body, a pair of flanges provided at both ends of the flexible tube main body and connected to the ends of the pipes facing each other, and a connecting member connecting the flanges The connecting member is detachably connected to each of the flanges and has at least a pair of protruding pieces protruding in opposite directions, and is arranged in the axial direction of the flexible pipe joint and has male thread portions at least at both ends. The protruding pieces connected to the flanges are arranged so that the protruding pieces of the flanges face each other, and the string-like members can be inserted therethrough. A flexible pipe joint that is screwed with a fastening nut in a state where the male thread portion is inserted into the insertion hole of each of the protruding pieces facing each other.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to adjust the dimension of a flexible tube main body easily, the flexible pipe joint which can connect piping reliably, without impairing flexibility can be provided. .

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, embodiment of this invention is not limited to the following embodiment at all, and the technical scope of this invention is not limited to this. In the following description of the embodiments, the same constituent elements are denoted by the same reference numerals, and the description thereof is omitted or simplified.

  FIG. 1 is a front view of a flexible pipe joint according to an embodiment of the present invention. FIG. 2 is a side view of the flexible pipe joint according to the embodiment as viewed from the flange side. FIG. 3 is an exploded perspective view of the flexible pipe joint according to the embodiment. FIG. 4 is a partially enlarged view showing a connection state between the flexible pipe joint and the connection pipe according to the embodiment. FIG. 5 is a partially enlarged view showing a connection state between the flexible pipe joint and the connection pipe according to the embodiment.

  As shown in FIGS. 1 to 3, the flexible pipe joint 1 includes a flexible tube main body 2, a pair of flanges 3 a and 3 b provided at both ends of the flexible tube main body 2, and a pair of flanges attached to the flanges. Protruding pieces 5a and 5b (6a and 6b) and two long screws 4a and 4b which are rod-shaped members are provided. The long screws 4a, 4b are screwed together by nuts 41a, 42a, 41b, 42b (43a, 44a, 43b, 44b) in a state of being inserted into the protruding pieces 5a, 5b (6a, 6b). In addition, in this embodiment, although the nut was arrange | positioned on the both sides so that protrusion piece 5a, 5b (6a, 6b) may be pinched | interposed, it is not restricted to this in this invention. For example, the long screws 4a and 4b may be screwed from the outside of the protruding pieces 5a and 5b (6a and 6b).

  The flexible tube main body 2 is formed in a substantially cylindrical shape, and includes a cylindrical portion 21 and seal portions 22 a (22 b) provided at both ends of the cylindrical portion 21. The cylindrical portion 21 is formed in a waveform (bellows shape) in which the outer periphery in the axial cross section rises at a plurality of locations. Thereby, the flexible tube main body 2 can increase the flexibility.

  The seal portion 22a (22b) is formed integrally with the tubular portion 21, and is formed to extend to the flange surface 31a (31b) via the flange 3a (3b). In other words, the seal portion 22a (22b) is formed in a substantially cylindrical shape extending in the axial direction on the flange surface 31a (31b). As described above, the seal portion 22a (22b) formed integrally with the cylindrical portion 21 is formed so as to extend to the flange surface 31a (31b) via the flange 3a (3b), whereby the flange 3a ( 3b) is fixed to the flexible tube body 2. Moreover, it becomes possible to increase adhesiveness with the other party piping 100 to connect by providing the seal part 22a (22b) in the flange surface 31a (31b).

  Here, the cylindrical portion 21 and the seal portion 22a (22b) are formed of an elastic member such as rubber in which a tire cord (reinforcing fiber) formed of nylon or polyester is embedded. Further, a metal reinforcing ring (not shown) is embedded in the seal portion 22a (22b). Thereby, the flexible tube main body 2 formed from the cylindrical part 21 and the seal part 22a (22b) can be provided with a predetermined pressure resistance while having flexibility by the elastic member. In addition, it is preferable that an elastic member coat | covers the inner wall surface of the rubber layer which consists of synthetic rubber etc. with the material excellent in heat resistance, such as a fluororesin, and chemical resistance.

  The flange 3a (3b) is formed in an annular shape, and is provided with a plurality of connection holes 32a (32b) for connecting to the end of the mating pipe 100. The connecting hole 32a (32b) is also used as a connection hole for connecting the protruding pieces 5a, 5b (6a, 6b). Needless to say, the number and size of the connecting holes 32a (32b) of the flange 3a (3b) vary depending on the standard of the flange 3a (3b).

  The protruding pieces 5a and 5b (6a and 6b) are formed in a substantially vertically long plate shape, and mounting holes 52a and 52b (62a and 62b) for mounting the flange 3a (3b) on one side in the longitudinal direction are formed. Is provided. The mounting holes 52a and 52b (62a and 62b) are provided with thread grooves into which the mounting bolts 51a and 51b (61a and 61b) can be screwed. Further, insertion holes 53a and 53b (63a and 63b) through which the long screws 4a and 4b are inserted are provided on the other side in the longitudinal direction. The insertion holes 53a and 53b (63a and 63b) may be holes having a size that allows long screws to be inserted.

  The protruding pieces 5a, 5b (6a, 6b) are formed by overlapping the connecting holes 32a (32b) of the flange 3a (3b) with the mounting holes 52a, 52b (62a, 62b), and mounting bolts 51a from the connecting holes 32a (32b). , 51b (61a, 61b) are inserted and the mounting holes 52a, 52b (62a, 62b) and the mounting bolts 51a, 51b (61a, 61b) are screwed together.

  Here, the mounting bolts 51a and 51b (61a and 61b) have such a length that the screw portions do not protrude from the mounting holes 52a and 52b (62a and 62b) after screwing into the mounting holes 52a and 52b (62a and 62b). Is used. That is, the mounting bolts 51a and 51b (61a and 61b) have a length obtained by adding the thickness of the flange 3a (3b) and the thickness of the protruding pieces 5a and 5b (6a and 6b) in the axial direction. The following lengths are used.

  The protruding pieces 5a and 5b (6a and 6b) are arranged such that at least a part of one side in the longitudinal direction is in contact with the outer peripheral surface of the seal portion 22a (22b) on the flange surface 31a (31b) of the flange 3a (3b). Be placed. In this way, the protruding pieces 5a and 5b (6a and 6b) are arranged so as to come into contact with the outer peripheral surface of the seal portion 22a (22b) on one side in the longitudinal direction, for example, the protruding pieces 5a and 5b (6a). 6b) is attached to the flange 3a (3b), the movement of the protruding pieces 5a, 5b (6a, 6b) in the rotational direction is restricted by the outer peripheral surface of the seal portion 22a (22b). The protruding pieces 5a and 5b (6a and 6b) can be attached without rotating (6a and 6b).

  Further, when the protruding pieces 5a and 5b (6a and 6b) are attached to the flange 3a (3b), the thickness of the flexible pipe joint in the axial direction is larger than the thickness of the seal portion 22a (22b) in the axial direction. It is formed to be thin. Thus, by making the thickness of the protruding pieces 5a, 5b (6a, 6b) thinner than the thickness of the seal portion 22a (22b), for example, the mating flange 101 and the flange 3a (3b) of the mating pipe 100 are used. Also, since the seal portion 22a (22b) is thicker in the axial direction than the projecting pieces 5a and 5b (6a and 6b), the mounting bolts 51a and 51b (61a and 61b) are attached. After the extraction, the protruding pieces 5a and 5b (6a and 6b) can be easily taken out from the gap between the flange 3a (3b)) and the counterpart flange 101 of the counterpart pipe 100.

  The long screws 4a and 4b are formed to be longer than the flexible pipe joint 1, and male screw portions are provided at both ends thereof. The male thread portion is formed so as to be screwable with the nuts 41a, 42a, 41b, 42b (43a, 44a, 43b, 44b), and the insertion holes 53a, 53b (63a, 63b) of the protruding pieces 5a, 5b (6a, 6b). After 63b) is inserted, the nuts 41a and 41b (43a and 43b) are screwed together. In this manner, the long screws 4a and 4b through which the insertion holes 53a and 53b (63a and 63b) are inserted are tightened in the direction in which the nuts 41a and 41b (43a and 43b) approach each other to be manufactured of an elastic member. Since the flexible tube main body 2 contracts due to the elastic force, the distance between the opposing protruding pieces 5a and 5b (6a and 6b) can be shortened. That is, the length of the flexible pipe joint 1 in the axial direction can be shortened.

  The long screws 4a and 4b are screwed together by nuts 41a, 42a, 41b and 42b (43a, 44a, 43b and 44b) on both sides so as to sandwich the protruding pieces 5a and 5b (6a and 6b). In other words, the long screws 4a and 4b are screwed together by a pair of nuts 41a and 42a at their respective ends. Thus, by tightening with the pair of nuts 41a and 41b, it is possible to prevent the tightened nut 41a from being loosened.

  In the present embodiment, the long screws 4a and 4b are all formed with a male screw portion, but the present invention is not limited to this. For example, it is only necessary that the threaded portion is formed to the extent that the length of the flexible tube main body 2 can be adjusted by tightening nuts at both ends thereof.

  Moreover, in this embodiment, you may use string-shaped members, such as a wire rope, instead of the long screws 4a and 4b which are rod-shaped members. For example, when a wire rope is used, one formed by twisting a plurality of metal strands is preferable, and one having screw portions at both ends can be exemplified. The threaded portion may be formed by joining with solder, or may be formed by pressure-bonding the threaded portion to a wire rope.

  Next, a procedure for mounting the flexible pipe joint 1 will be described. The flexible pipe joint 1 connects mating pipes 100 and 100 whose end portions are arranged to face each other. Specifically, it connects with the other party flanges 101 and 101 provided in each edge part.

  First, the length between the mating flanges 101 and 101 is measured, and the adjustment amount of the flexible pipe joint 1 to be mounted between them is determined. Next, the nuts 42a, 42b, 44a, 44b disposed on the inner side in the axial direction of the long screws 4a, 4b attached to the flange 3a (3b) of the flexible pipe joint 1 are loosened in the axial direction to a predetermined amount. Move it.

  When the nuts 42a, 42b, 44a, 44b arranged on the inner side in the axial direction are moved, the nut 41a on the outer side in the axial direction of the long screw 4a on one side is tightened by a predetermined amount. For example, tighten 1 cm. Next, the nut 43a on the outer side in the axial direction at the end opposite to the long screw 4a is similarly tightened, for example, 1 cm. When the long screw 4a on one side is tightened, the long screw 4b on the other side is similarly tightened by the same amount. Then repeat these. When the flexible pipe joint 1 reaches the target adjustment length, the nuts 42a, 42b, 44a, 44b that are arranged on the inner side in the axial direction and loosened on the inner side are then inserted into the protruding pieces 5a, 5b ( Tighten in the direction of 6a, 6b). As a result, each of the nuts is subjected to a force in the axial direction and is less likely to loosen.

  The flexible pipe joint 1 whose length is adjusted in this way is arranged between the mating flanges 101 and 101. As shown in FIG. 4, the flexible pipe joint 1 arranged between the mating flanges 101 and 101 is temporarily joined to the mating flanges 101 and 101 by a fastening nut 102.

  Next, the temporarily joined flexible pipe joint 1 loosens the mounting bolts 51a and 51b (61a and 61b), and removes the mounting bolts 51a and 51b (61a and 61b) from the flanges 3a and 3b. When the mounting bolts 51a and 51b (61a and 61b) are removed, the protruding pieces 5a and 5b (6a and 6b) are then removed as shown in FIG.

  When the protruding pieces 5a and 5b (6a and 6b) to which the long screw 4a is connected are removed, the flexible tube main body 2 tries to return to the original length by elastic force. However, the flexible tube main body 2 tries to extend to the original length by removing the protruding pieces 5a and 5b (6a and 6b) connected to the long screws 4a and 4b. Since it is arrange | positioned between the piping 100 and 100, it can extend only to the length between each other side piping 100 and 100. Thereby, in the state which the seal parts 22a and 22b provided in the both ends of the flexible tube main body 2 were press-contacted, each other party piping 100 and the flexible pipe joint 1 are closely_contact | adhered.

  In this state, the fastening nut 103 that has been temporarily joined is tightened and the remaining fastening nuts 103 are joined. Thereby, the other party piping 100 and 100 can be connected reliably, without impairing flexibility.

It is a front view of the flexible pipe joint which concerns on embodiment of this invention. It is the side view which looked at the flexible pipe joint which concerns on the said embodiment from the flange side. It is a perspective exploded view of the flexible pipe joint according to the embodiment. It is the elements on larger scale which show the connection state of the flexible pipe joint which concerns on the said embodiment, and connection piping. It is the elements on larger scale which show the connection state of the flexible pipe joint which concerns on the said embodiment, and connection piping.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flexible pipe joint 2 Flexible pipe main body 3a, 3b Flange 4a, 4b Long screw 5a, 5b (6a, 6b) Projection piece 7 Fastening bolt 21 Cylindrical part 22a, 22b Seal part 100 Opposite side piping 101 Opposite side Flange

Claims (1)

It is a flexible pipe joint that connects ends of pipes arranged to face each other,
A substantially cylindrical flexible tube body;
A pair of flanges provided at both ends of the flexible tube body and formed in an annular shape connected to the end of the pipe;
A connecting member connecting these flanges;
A seal portion formed integrally with the flexible tube main body and extending to a flange surface abutting against an end of the pipe;
The connecting member is
At least a pair of projecting pieces that are removably connected to the flange and project in opposite directions to each other;
A plurality of rod-shaped members arranged in the axial direction of the flexible pipe joint and having male thread portions at least at both ends;
The at least one pair of the projecting pieces are arranged so as to face the other at least one pair of the projecting pieces, and these projecting pieces have insertion holes through which the rod-shaped member can be inserted,
The rod-shaped member has a fastening nut that is screwed into the male screw portion in a state where the male screw portion is inserted through the insertion hole of the protruding piece,
The protruding piece is formed such that the thickness in the axial direction of the flexible tube main body is thinner than the thickness from the flange surface to the end of the seal portion ,
The seal portion is formed in a substantially cylindrical shape on the flange surface,
The protruding piece is a flexible pipe joint arranged on the surface of the flange so as to be in contact with the outer peripheral surface of the seal portion.

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