JP6624587B2 - Pipe fastening structure and pipe fastener - Google Patents

Description

  The present invention relates to a pipe fastening structure for fastening an elastically deformable tubular body such as a hose or a tube to a joint with a tightening band to prevent the tubular body from coming off, and a pipe fastener used for the same.

Conventionally, as a pipe fastening structure and a pipe fastener of this type, a first free end having an outer overlapping portion based on an outer arrangement and an inner arrangement in which ends of a tubular band-shaped body are circumferentially opposed to each other and overlap each other. Spring having a portion and a second free end having an inner overlapping portion, the hose having a spring elasticity for enclosing a predetermined elastic hose around its outer periphery and tightening the hose substantially in a centripetal direction. There is a clamp (clip) (for example, see Patent Document 1).
Patent Document 1 discloses that a clip is fitted to the outside of a hose having a fiber reinforced layer of polyester or the like in a layer in a state in which a tubular member is inserted into the end of the hose, whereby the clip has a spring elastic pressure. Thereby, the end of the hose is tightened along the tubular member.
Also, a clip to tighten the hose fitted on one end of the pipe while reducing the diameter from the outer circumference, a circular tightening section capable of tightening the hose from the outer circumference, and a shaft from the axial end of the circular tightening section. An L-shaped hook extending in the circumferential direction and extending in the circumferential direction is integrally provided, and a flare nut provided on the pipe is provided with an L-shaped notch, and the L-shaped hook is formed into an L-shaped notch. There is a hose fastening structure in which the shaft is inserted in the axial direction and then rotated in the circumferential direction so as to be immovably engaged with each other in the axial direction (for example, see Patent Document 2).

JP 07-239081 A JP 2010-169175 A

Meanwhile, as described in Patent Literature 1, there is a reinforcing pipe in which a reinforcing wire is spirally embedded inside a wall of the pipe, such as a hose having flexibility, so that the pressure resistance is improved. .
Inside this reinforcing tube, a spiral concave-convex tube formed by embedding a spiral reinforcing wire so that a part of the outer surface protrudes in a spiral shape to expose a spiral convex portion and a spiral concave portion in a wave shape. There is.
However, even when such a spiral concave-convex tube is tightened in the radial direction with respect to a cylindrical member or a pipe by the clips described in Patent Documents 1 and 2, the inner peripheral surface of the clip has the tip of the spiral convex portion. , The frictional resistance between them is much smaller than that of a tube having a smooth outer surface. For this reason, when the pressure of the fluid passing through the inside of the spiral uneven tube rises, or when the spiral uneven tube is pulled in the direction in which the tubular member or pipe comes off, the spiral uneven tube slides from the inner peripheral surface of the clip. There is a problem in that it easily moves and comes off, causing a decrease in pressure resistance and a fluid leak.

In order to achieve the above object, a pipe fastening structure according to the present invention includes a nipple inserted into an elastically deformable spiral concave / convex pipe having a spiral convex part and a spiral concave part on an outer surface, and a sheath provided on the nipple. An engagement portion, a tightening band that is provided to be deformable in the radial direction with the spiral concave-convex tube interposed between the nipple and tightens the spiral concave-convex tube , and an elastic deformation operating unit provided in the tightening band. positioning said from said one axial end of the tension band said to protrude toward axis direction engaged portion that engages the engaged portion in the axial direction, pair pre Symbol tension band to the nipple the axial direction a retaining part is provided so as to, and a locking portion provided in the protruded in the axial direction along the outer surface of the helical irregularity tube from the axial end of the tension band, the locking portion Insert the nipple Characterized Rukoto which have a locking claw is formed to the engaging and fitted into the helical recess of the helical irregularity tube axially I.
Further, in order to achieve such a problem, a pipe fastener according to the present invention is provided with a nipple inserted in an elastically deformable spiral concave / convex pipe having a spiral convex portion and a spiral concave portion on an outer surface in an axial direction. A pipe tightening tool that is immovably mounted, the tightening band being provided to be deformable in a radial direction with the spiral uneven pipe interposed between the nipple and the tightening band for tightening the spiral uneven pipe , and the tightening band. An operating portion for elastic deformation, and axially projecting from one axial end of the tightening band toward an engaged portion provided on the nipple and axially engaging with the engaged portion, the nipple provided the tension band against the retaining portion is provided to position the axial direction, the axial direction protrude along the outer surface of the helical irregularity tube from the axial end of the tension band Comprising a stop portion, the locking portion may have a locking pawl which is formed so as to engage the axially fitted into the spiral recess of inserting the nipple the helical irregularity tube Rukoto It is characterized by.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the whole structure of the pipe fastening structure which concerns on embodiment of this invention, (a) is a front view, (b) is a vertical side surface which follows the (1B)-(1B) line of FIG. FIG. 1C is a cross-sectional plan view taken along line (1C)-(1C) in FIG. 1B. It is a perspective view of a disassembled state, (a) is the whole perspective view, (b) is the perspective view which looked at the pipe clamp (clamping band) from the opposite direction, (c) shows the diameter expansion state of the pipe clamp. FIG. 3D is a perspective view of the pipe fastener viewed from the opposite direction in a state where the diameter of the pipe fastener is enlarged. It is the perspective view and side view which show the connection process of a pipe to a nipple, (a) is a perspective view before inserting a nipple in a pipe, (b) is a side view in the same state, (c) is a nipple in a pipe. FIG. 2D is a perspective view after inserting the plug, FIG. 2D is a side view in the same state, FIG. 2E is a perspective view after rotating the pipe fastener (tightening band), and FIG. 2F is a side view in the same state. It is a perspective view which expands and shows the modification of a pipe fastening tool (tightening band). It is an expansion perspective view which expands and shows another modification of a pipe fastener (tightening band).

In the pipe fastening structure A according to the embodiment of the present invention, as shown in FIGS. 1 to 5, the nipple C1 of the joint C is inserted and inserted into the connection end of the pipe B, and the pipe fastener D is The tightening band 1 is set, and the diameter of the tightening band 1 is reduced so that the connection end of the tube B is tightened against the nipple C1. Things.
More specifically, the pipe fastening structure A according to the embodiment of the present invention includes the nipple C1 of the joint C inserted into the connection end of the elastically deformable pipe B, and the pipe B sandwiched between the nipple C1. It is provided so as to axially engage with the tightening band 1 of the pipe tightening tool D provided so as to be deformable in the radial direction, the operation portion 2 for elastic deformation provided on the tightening band 1, and the nipple C1 of the joint C. Main components include a retaining portion 3 and a locking portion 4 provided to project from the tightening band 1 toward the outer surface of the tube B.

The pipe fastener D according to the embodiment of the present invention is a clip, a clamp, or the like that is attached to the nipple C1 inserted into the elastically deformable pipe B so as to be immovable in the axial direction.
More specifically, a pipe tightening tool D according to an embodiment of the present invention includes a tightening band 1 provided to be radially deformable with a tube B interposed between the nipple C1 and an elastic deformation provided to the tightening band 1. Operating part 2 and a locking part 4 provided in a projecting manner from the tightening band 1 toward the outer surface of the tube B as main components.
The direction in which the pipe B is inserted into the nipple C1 is hereinafter referred to as a “tube insertion direction E”, and the direction opposite to the pipe insertion direction E, that is, the direction in which the spiral uneven tube B comes out of the nipple C1, is hereinafter referred to as a “tube exit direction F "

The tube B is made of a soft synthetic resin such as vinyl chloride or a soft material such as silicone rubber or other rubber, and is a flexible and deformable hose or tube, for example.
Examples of the tube B include a tube having a single-layer structure made entirely of the same material and a tube having a multi-layer structure in which a plurality of layers mainly made of different materials are laminated in the radial direction.
Further, examples of the tube B include a tube having a flat outer surface at least at the connection end or the entire length in the axial direction, and a tube having an uneven outer surface at at least the connection end or the entire length in the axial direction.
As a specific example of the tube body B whose outer surface is uneven over the entire length in the axial direction, a spiral uneven tube B ′ having a spiral convex portion B1 and a spiral concave portion B2 on the outer surface as shown in FIGS. There is.
Since such a spiral concave-convex tube B 'has a spiral convex portion B1 and a spiral concave portion B2 formed partially adjacently on its outer surface, the outer surface made of the same material has a flatter surface than a flat tube. There is an advantage that the flexibility is improved, the bending radius is reduced, and piping can be performed without breaking even in a narrow place.
Further, the spiral uneven tube B 'has a smaller outer surface area than a flat tube having a flat outer surface, so that the resistance when moving while making contact with a floor surface or the like is reduced, and the helical uneven tube B' is easily slid. Even if a fluid such as water or oil adheres to the outer surface, there is an advantage that the amount of the adhered fluid is small and slippage is prevented.

In the pipe B, there is a reinforcing pipe excellent in pressure resistance performance and excellent in shape retention performance that is hardly crushed and deformed by arranging the reinforcing wire rod B3 in a spiral or straight line in the axial direction. The reinforcing wire B3 is formed in a linear shape or a band shape, and is embedded in the inside of the thickness of the tube B (reinforcement tube) or provided so as to protrude from the outer surface of the tube B (reinforcement tube).
Specific examples of the reinforcing wire B3 include materials harder than the constituent material of the tubular body B (the reinforcing pipe), for example, wires made of a hard synthetic resin such as polyester or nylon (registered trademark), monofilaments (monofilaments), A multifilament, a metal wire, or the like is used.
The spirally wound form of the reinforcing wire B3 may be a single winding in which a single reinforcing wire B3 is spirally wound at a predetermined pitch in the axial direction of the tube B, or a plurality of reinforcing wires B3 that are axially separated. Are wound in a spiral at a predetermined pitch.

In the example shown in FIGS. 1 to 3, as a spiral uneven tube B ′, two reinforcing wires B3 are helically embedded at equal pitches in the axial direction inside the wall thickness of the spiral uneven tube B ′. A case is shown in which a double-wound reinforcing tube in which B1 and the spiral concave portion B2 are alternately formed in the axial direction is used.
As an example of a method for manufacturing the spiral uneven tube B ', first, an inner layer B4 made of a soft material such as a soft synthetic resin or rubber is extruded, and a reinforcing wire B3 is spirally wound along the outer peripheral surface of the inner layer B4. ing. Thereafter, an outer layer B5 made of the same material as the inner layer B4 or a material having excellent compatibility (affinity) with the inner layer B4 is extruded with an even thickness on the outer side of the inner layer B4 and the reinforcing wire rod B3. B4 and the reinforcing wire rod B3 are integrated.
Accordingly, on the outer surface of the spiral concave-convex tube B ', the spiral convex portions B1 and the spiral concave portions B2 are alternately formed in the axial direction depending on the presence or absence of the reinforcing wire B3. The inner surface (the inner peripheral surface of the inner layer B4) facing the nipple C1 described later in the spiral concave-convex tube B 'is formed smoothly without unevenness due to the presence or absence of the reinforcing wire B3.
Although not shown as other examples, one or three or more reinforcing wires B3 may be spirally wound in the axial direction at a constant pitch, or only on the outer surface of the spiral concave-convex tube B 'with a structure other than the illustrated example. It is also possible to form or change the spiral convex portion B1 and the spiral concave portion B2.

The joint C has a nipple C1 at one end in the axial direction.
The nipple C1 is made of a non-deformable rigid material such as a metal such as brass or a hard synthetic resin, and is formed into a substantially cylindrical shape having an outer diameter substantially equal to the inner diameter of the tube B (spiral uneven tube B '). Alternatively, for example, a plate made of a deformable rigid material such as stainless steel is pressed or otherwise formed into a thin cylindrical shape.
As shown in FIGS. 1 to 3, the nipple C <b> 1 of the joint C radially opposes the inner surface of the tube B (spiral uneven tube B ′) tightened by the tightening band 1 of the tube tightening tool D described below. It is preferable to have an annular concave portion C11 formed as described above, and an engaged portion C2 that axially engages with a retaining portion 3 of a pipe fastener D described later.
The engaged portion C2 axially positions the tightening band 1 of the pipe fastener D with respect to the nipple C1 by engaging a retaining portion 3 of the pipe fastener D described later.
Further, on the outer peripheral surface of the nipple C1, an O-ring or the like is provided at a position radially opposed to the inner surface of the tube B (spiral uneven tube B ') tightened by the tightening band 1 of the tube tightening tool D described later. It is also possible to provide an annular sealing material (not shown) made of packing.

As a specific example of the annular concave portion C11, in the case shown in FIGS. 1 to 3, a plurality (one pair) of annular concave portions C11 are formed on the outer peripheral surface of the nipple C1 at predetermined intervals in the axial direction.
As shown in FIGS. 1 to 3, as a specific example of the engaged portion C2, a locking flange C21 that protrudes in the radial direction on the outer peripheral surface of the distal end of the nipple C1 and is formed in an annular shape; It has an engagement groove C22 formed on the opposite side of the nipple C1 in the axial direction (pipe insertion direction E).
It is preferable that the locking flange C21 is formed in a ring shape so as to protrude in the radial direction on the outer peripheral surface of the nipple C1, and has a cutout portion C23 through which a hook 3a of the retaining portion 3 described below can pass in the axial direction.
The engagement groove C22 is formed in the circumferential direction so as to be adjacent to the locking flange C21, and is set to be deeper than the protrusion amount of the locking flange C21 and shallower than the outer peripheral surface of the nipple C1.
The notch C23 is preferably formed in a concave shape so that the bottom surface thereof is arranged shallower than the depth of the inner bottom surface of the engagement groove C22.
Although not shown as another example, the bottom surface of the cutout portion C23 may be formed in a concave shape so as to be shallower than the illustrated example, and the cutout portion C23 may not be provided.
It is preferable that the number of the cutouts C23 is formed in at least one or more (single or plural) concave portions in the circumferential direction of the locking flange C21.

Further, in the example shown in FIGS. 1 to 3, the nipple C1 has a tool engagement portion C3 with which a tool (not shown) such as a spanner or a wrench engages on the other axial side with respect to the engagement groove C22. And a connecting portion C4 for connecting to another pipe or another device are integrally formed.
A hexagon nut is formed as the tool engagement portion C3.
When an internal thread is engraved on the inner surface of a pipe connection port (not shown) that connects to the joint C in another pipe or another device, the connection part C4 is engraved with an external thread corresponding to the internal thread. When an external screw is engraved on the outer surface of the pipe connection port, an internal screw corresponding to the external screw is engraved. In the illustrated example, an external screw is engraved as the connection portion C4.
Although not shown as another example, it is also possible to form the nipple C1 and the joint C separately and attach the nipple C1 and the joint C detachably.

Further, by connecting the nipple C1 of the joint C to another pipe or another device by the connecting portion C4, it is also possible to electrically connect these.
In particular, when the tightening band 1 of the joint C and the pipe fastener D and the retaining portion 3 described later are formed of a conductive material such as a metal, the connection state between the pipe B (spiral uneven tube B ') and the joint C. Since a retaining portion 3 described later of the tightening band 1 that comes into contact with the outer surface of the tube B (the spiral convex portion B1 of the spiral concave-convex tube B ') is in contact with the locking flange 12 of the nipple C1, The outer surface of the tube B (spiral convex portion B1 of the helical uneven tube B ') is in electrical communication with the nipple C1 or another tube or another device via the tightening band 1.
In addition, in order to remove static electricity generated by the transfer of the fluid passing through the inside of the tube B (spiral uneven tube B '), the outer surface of the tube B (spiral convex portion B1 of the spiral uneven tube B') is electrically conductive. When a conductive portion or an outermost layer made of a material is provided, static electricity generated by the transfer of the fluid is transferred from the outer surface of the tube B (spiral convex portion B1 of the helical uneven tube B ') via the tightening band 1 to the nipple C1. Can be grounded on the side. Thereby, there is an advantage that the safety is excellent.

The pipe fastener D is described in JP-A-07-239081 or JP-A-2010-169175, which is a clip in which the tightening band 1 is reduced in diameter by spring elasticity, or described in JP-A-61-244904. It is composed of a clamp in which the tightening band 1 is reduced in diameter by rotation of the worm, and a clamp in which the tightening band 1 is reduced in diameter by other shapes.
More specifically, the pipe tightening tool D includes a band-shaped tightening band 1 that covers the outer periphery of the connection end of the pipe B (spiral uneven tube B ′), and an operating unit that is formed integrally with the tightening band 1. 2, a retaining portion 3 protruding from the tightening band 1 toward the engaged portion C2 of the nipple C1, and an outer surface of the tube B from the tightening band 1 (spiral concave portion B2 of the helical uneven tube B '). And a locking portion 4 formed so as to protrude toward.

The tightening band 1 of the pipe tightening tool D is formed by bending a metal material having excellent elastic repulsion such as spring steel or another elastically deformable material or a band-shaped material made of a deformable material into an annular shape. It has an inner peripheral surface 1a that can be elastically deformed in the direction.
The operating portion 2 of the pipe tightening tool D allows the user to relatively move the circumferential end portions of the tightening band 1 in the circumferential direction, and the inner peripheral surface 1a of the tightening band 1 is contracted by the operation of the user. It is configured to be deformed in diameter or diameter.
As shown in FIGS. 2A and 3B and FIGS. 3A and 3B, the inner diameter of the tightening band 1 when the operating portion 2 is contracted has a tube body in the initial state where the nipple C1 is not inserted. The outer diameter of B (spiral convex portion B1 of spiral concave-convex tube B ') is set to be substantially the same as or slightly smaller than the outer diameter. As shown in FIGS. 1 (a) to 1 (c) and FIGS. 3 (e) and 3 (f), a connection arranged so as to cover the outer periphery of the tube B (spiral uneven tube B ') into which the nipple C1 is inserted. In the state, the outer diameter of the tubular body B (spiral convex portion B1 of the spiral uneven tube B ') is set to be smaller than the outer diameter thereof, and the connection of the tubular body B (spiral uneven tube B') to the nipple C1. The ends are elastically clamped in the radial direction.
Further, as shown in FIGS. 2C, 3D and 3C, 3D, the inner diameter of the tightening band 1 at the time of expanding the diameter of the tightening band 1 by the operation unit 2 is in an initial state where the nipple C1 is not inserted. Not only the outer diameter of the tubular body B (spiral convex portion B1 of the spiral uneven tube B ') but also the outer diameter of the tubular body B (spiral convex portion B1 of the spiral uneven tube B') into which the nipple C1 is inserted. Set to be larger. As a result, a gap is formed between the inner peripheral surface 1a of the tightening band 1 and the outer surface of the tubular body B (the spiral convex portion B1 of the spiral uneven tube B ') into which the nipple C1 is inserted, and the nipple C1 is inserted. The tightening band 1 of the pipe fastener D can be freely moved in the axial direction and the circumferential direction with respect to the outer surface of the formed pipe B (spiral convex portion B1 of the spiral concave-convex pipe B ').

As a specific example of the pipe fastener D, in the case shown in FIGS. 1 to 5, the pipe fastener D has a spring elasticity as described in JP-A-07-239081 or JP-A-2010-169175. The tightening band 1 uses a clip whose diameter is reduced and deformed.
More specifically, the tightening band 1 shown in FIGS. 1 to 5 is a clip band whose diameter is reduced by spring elasticity. In this case, a pair of knobs 2a are integrally formed as operation parts 2 at both ends in the circumferential direction of the band material (clip band), and the user approaches the knobs 2a in the circumferential direction against the elasticity of the band material. By moving, the inner peripheral surface 1a of the band-shaped material expands and deforms. When the user releases the knob 2a serving as the operation unit 2 in this expanded diameter deformed state, the diameter is reduced by the spring elasticity of the band-shaped material, and the tube B (spiral uneven tube B ') is tightened.
Further, the tightening band 1 shown in FIGS. 1 to 4 has a through hole 1b formed from one circumferential end of the band-shaped material (clip band) to one operating portion 2 and another circumferential end of the band-shaped material. A movable portion 1c formed in the through hole 2b so as to be movable in the circumferential direction in a continuous manner with the other operation portion 2; It has an end 1d to be arranged, and an engagement hole 1e formed at an intermediate position in the circumferential direction of the strip.
The end 1d of the tightening band 1 is disposed so as to face the edge of the annular concave portion C11 of the nipple C1 across the tube B (spiral uneven tube B ') in the radial direction and to engage in the axial direction. . The engagement hole 1e is arranged so that a part of the hole edge faces the edge of the annular concave portion C11 across the tube B (spiral uneven tube B ') in the radial direction and engages in the axial direction. ing.
The shapes of the through hole 1b, the movable portion 1c, the engagement hole 1d, the engagement hole 1e, and the operation portion 2 can be changed to shapes other than those shown in the drawings. The engagement hole 1e may not be provided as shown in FIG.
Although not shown as another example of the pipe tightening tool D, a clamp such as that described in Japanese Patent Application Laid-Open No. 61-244904, in which the tightening band 1 is reduced in diameter by rotation of the worm, is not shown. It is also possible to use. In this case, a worm is provided as an operation portion 2 at one end in the circumferential direction of the tightening band 1 in place of the clip band which is reduced in diameter by spring elasticity, and the worm is rotated in either direction by the user. The inner peripheral surface 1a of the tightening band 1 is reduced in diameter, and the inner peripheral surface 1a of the tightening band 1 is expanded and deformed by rotating in the opposite direction.

One or a plurality of stoppers 3 of the pipe fastener D are integrally formed or integrally fixed so as to protrude axially and radially from a part of the circumferential direction at one axial end of the tightening band 1. Is done.
As shown in FIGS. 1 to 5, the retaining portion 3 extends in the radial direction along the locking flange C <b> 21 of the nipple C <b> 1, and moves the locking flange C <b> 21 in the axial direction with the radial deformation of the tightening band 1. It is preferable to have a hook 3a that can get over.
The hook 3a moves over the locking flange C21 in the axial direction as it moves in the axial direction with respect to the tube B (spiral uneven tube B ') into which the nipple C1 is inserted due to the expansion deformation of the tightening band 1, and thereafter moves over the locking flange C21. The tightening band 1 is set so as to enter the engagement groove C22 as the diameter of the tightening band 1 is reduced.
Further, it is preferable that at least one (single or plural) concave portion 3 is formed in the circumferential direction of the tightening band 1 in a concave shape.
In the case shown in FIGS. 1 to 4, one retaining portion 3 is formed, but as shown by a two-dot chain line in FIG. 5, a plurality (two or more) It is also possible to form at equal intervals in the direction.
In addition, the retaining portion 3 and the engaged portion C2 can be changed to structures other than the illustrated example.

The locking portion 4 of the pipe fastener D locks a part of the tightening band 1 in the axial direction with respect to the outer surface of the pipe B into which the nipple C1 is inserted (spiral concave portion B2 of the spiral concave / convex pipe B '). By doing so, the tube body B (spiral uneven tube B ') is held immovable in the axial direction with respect to the nipple C1.
Further, it is preferable that the locking portion 4 has a locking claw 4a formed so as to fit into the spiral concave portion B2 of the spiral concave-convex tube B 'into which the nipple C1 is inserted.
The locking claw 4a protrudes from one axial end of the tightening band 1 so as to extend in the axial direction toward the spiral concave portion B2 of the spiral concave-convex tube B ', and is inclined so as to fit at least the distal end portion 4b into the spiral concave portion B2. Or, it is formed in a bent shape.
The length of the projection of the locking claw 4a in the axial direction is set in accordance with the pitch in the axial direction of the spiral concave portion B2 in the spiral concave-convex tube B '. That is, it is necessary to adjust the position of the distal end portion 4b of the locking claw 4a so as to face the spiral concave portion B2 in the radial direction according to the spiral winding form of the reinforcing wire B3.
Thus, when the spiral concave / convex pipe B 'starts to move in the pipe removal direction F with respect to the nipple C1 in a state in which the locking claw 4a of the locking portion 4 is fitted, the spiral recess into which the locking claw 4a is fitted. The distal end portion 4b of the locking claw 4a is more strongly fitted (bitten) in the axial direction with respect to B2, so that the spiral uneven tube B 'cannot be moved in the tube removal direction F.
Further, it is preferable that a plurality of locking portions 4 (locking claws 4a) are arranged at equal intervals in the circumferential direction in the tightening band 1.
Further, it is preferable that the locking portion 4 (locking claw 4a) is disposed so as to face the end portion B5 of the tube B (spiral uneven tube B ') into which the nipple C1 is inserted. That is, the locking portion 4 (locking claw 4a) is arranged at the edge of the tightening band 1 radially opposed to the end portion B5 of the tube B (spiral uneven tube B ') on the side where the retaining portion 3 is arranged. Is preferred.

As shown in FIGS. 1 to 3 and FIG. 5, as a specific example of the locking portion 4 (locking claw 4 a), a plurality of (two ) Are inclined from the edge of the tightening band 1 so that the respective tips 4b fit into the spiral recesses B2.
The protruding lengths of the plurality of locking claws 4a in the axial direction may be different because the respective tips 4b need to be arranged in accordance with the pitch of the spiral recess B2.
As shown in FIG. 4, three or more locking claws 4a can be arranged at equal intervals in the circumferential direction.
Although not shown as another example, the locking claw 4a may be bent so that the distal end portion 4b is fitted into the spiral concave portion B2 from the middle in the axial direction.
As shown in the drawing, the base 4c or the vicinity of the base 4c of the locking claw 4a is bent from the edge of the tightening band 1 so that the locking claw 4a including the distal end 4b is inclined as a whole. When processing is performed so as to be performed, there is an advantage that the accuracy and workability are superior to the processing in which the locking claw 4a is bent halfway in the axial direction.

Then, in the pipe fastening structure A according to the embodiment of the present invention, a method of connecting the pipe B (spiral uneven pipe B ′) to the joint C will be described in the order of steps.
First, in the initial state shown in FIG. 3A, the connection end of the tube B (spiral uneven tube B ′) is inserted into the tightening band 1 of the tube tightening tool D, and the tightening band 1 is connected to the tube B (spiral). The nipple C1 of the joint C is connected to the connection end of the tubular body B (spiral uneven tube B ') after the nipple C1 of the joint C is disposed in the pipe removal direction F from the end portion B5 of the uneven tube B'). Insert and insert. In the example shown in FIG. 3A, the connection end of the pipe B (spiral uneven pipe B ′) is pushed in the pipe insertion direction E with respect to the nipple C1 of the joint C.
In this initial state, as shown in FIG. 3B, since the operation portion 2 of the pipe fastener D is not moved, the diameter of the tightening band 1 is reduced. At this time, when the inner diameter of the tightening band 1 is set to be substantially the same as the outer diameter of the tubular body B (spiral convex portion B1 of the spiral uneven tube B '), the inner peripheral surface 1a of the tightening band 1 is Slides along the outer surface (spiral convex portion B1 of the helical uneven tube B '), so that the pipe fastener D can be smoothly inserted.
When the inner diameter of the tightening band 1 is set to be slightly smaller than the outer diameter of the tubular body B (spiral convex portion B1 of the helical uneven tube B '), the operating portion 2 of the pipe clamp D is operated. The inner peripheral surface 1a of the tightening band 1 and the inner end surface of the hook 3a of the retaining portion 3 and the outer surface of the tube B (the spiral shape of the spiral uneven tube B ') Since a gap is formed between the pipe fastener D and the convex portion B1), the pipe fastener D can be smoothly inserted.

Next, as shown in FIGS. 3C and 3D, the tightening band 1 and the retaining portion 3 are engaged with the nipple C1 while the tightening band 1 is expanded and deformed by the operating portion 2 of the pipe tightening tool D. By moving in the pipe insertion direction E so as to approach the stopper flange C21, the distal end surface of the hook 3a of the retaining portion 3 is made to pass over the locking flange C21 in the axial direction.
In the illustrated example, the inner peripheral surface 1a of the tightening band 1 is moved in the pipe insertion direction E by moving the inner end surface of the hook 3a arranged substantially in the same direction in the axial direction so as not to contact the bottom surface of the cutout portion C23. It is configured to smoothly pass in the axial direction and easily pass over the locking flange C21.
Although not shown as another example, the entire end portion of the retaining portion 3 or at least the distal end surface of the hook 3a is partially elastically deformed and moved in the pipe insertion direction E so that the inner end surface of the hook 3a It is also possible to change so that the tip end surface of the hook 3a passes over the locking flange C21 in the axial direction beyond the bottom surface of the cutout portion C23 formed shallower than the illustrated example.
If the amount of deformation of the tightening band 1 and the retaining portion 3 in the pipe fastener D is large, the notch C23 may not be formed in a concave shape.

After the hook 3a of the retaining portion 3 has passed over the locking flange C21 in the pipe insertion direction E with this movement, the hook 3a is moved to the locking flange C21 as shown in FIGS. By rotating the tightening band 1 in the circumferential direction of the tube B (spiral uneven tube B ') so as to be hooked along the outer surface of the tube B, the locking portion 4 (the tip portion 4b of the locking claw 4a) is rotated. (The spiral concave portion B2 of the spiral concave-convex tube B ').
When the expansion deformation of the tightening band 1 by the operation unit 2 is released at this position, the tightening band 1 is elastically contracted and deformed, and the pipe B (spiral uneven pipe B ′) is placed between the band and the nipple C1 of the joint C. ) The connection end is sandwiched and tightened.
At the same time, the hook 3a of the retaining portion 3 enters the engaging groove C22 of the nipple C1, and the engaging portion 4 bites into an appropriate location on the outer surface of the tube B (the tip portion 4b of the engaging claw 4a has spiral irregularities). Fit into the spiral recess B2 of the tube B ').
As a result, the hook 3a of the retaining portion 3 engages with the engagement groove C22 of the nipple C1 in the pipe removal direction F and becomes immovable, and the pipe B (spiral uneven pipe B ′) is moved with respect to the nipple C1 of the joint C. The connection end of ()) is prevented from coming off by the pipe fastener D. Further, the locking portion 4 (locking claw 4a) engages with the outer surface of the tubular body B (spiral concave portion B2 of the spirally uneven tube B ') in the pipe removal direction F, and the tubular body B (with respect to the nipple C1). The connection end of the spiral concave-convex tube B ') is prevented from coming off by the tube clamp D.

According to the pipe fastening structure A according to the embodiment of the present invention, in a state where the nipple C1 is inserted into the pipe B and the tightening band 1 is set so as to sandwich the pipe B with the nipple C1, The tightening band 1 is positioned in the axial direction with respect to the nipple C1 by the locking portion 4, and the locking portion 4 protruding from the tightening band 1 is cut into the outer surface of the tube B.
As a result, even if the pressure of the fluid passing through the inside of the pipe B increases or the pipe B is pulled in the pipe removal direction F with respect to the nipple C1, the tightening band 1 is prevented from coming off the nipple C1. At 3, the tube B is prevented from coming off in the axial direction, and the tube B is kept tightened by the tightening band 1.
At the same time, the locking portion 4 bites into the outer surface of the tube B, so that the tube B is prevented from coming off in the axial direction with respect to the nipple C1.
Therefore, the tube B can be tightly held by the tightening band 1 irrespective of its simple structure.
As a result, the inner peripheral surface of the clip only partially comes into contact with the tip of the helical convex portion, so that the pressure resistance performance can be prevented from lowering and fluid leakage can be prevented, as compared with the conventional device in which the frictional resistance between the two is small. Performance can be improved.
Furthermore, even if a fluid such as water or oil adheres to the outer surface of the tube B, the pull-out strength of the tube B can be maintained, and a decrease in pressure resistance and a fluid leak can be reliably prevented.

In particular, the tube B is a spiral concave / convex tube B ′ having a spiral convex portion B1 and a spiral concave portion B2 on the outer surface, and the locking portion 4 is a spiral concave portion of the spiral concave / convex tube B ′ into which the nipple C1 is inserted. It is preferable to have a locking claw 4a formed to fit into B2.
In this case, with the tightening band 1 being positioned in the axial direction with respect to the nipple C1 by the locking portion 4, the locking claw 4a of the locking portion 4 is moved from the tightening band 1 to the spiral concave portion of the spiral uneven tube B '. By fitting into B2, the pressure of the fluid passing through the inside of the spiral uneven tube B 'rises, or even if the spiral uneven tube B' is pulled in the tube removal direction F with respect to the nipple C1, the nipple The tightening band 1 is prevented from coming off in the axial direction with respect to C1 by the retaining portion 3 and the tightening band 1 continues to tighten the spiral uneven tube B '. At the same time, the engaging claw 4a is strongly fitted into the spiral concave portion B2, so that the spiral concave / convex tube B 'is prevented from falling off in the axial direction with respect to the nipple C1.
Accordingly, the spiral band B 'can be tightly held by the tightening band 1 so that the spiral uneven tube B' cannot be pulled out with a simple structure.
As a result, the inner peripheral surface of the clip only partially comes into contact with the tip of the helical convex portion, so that the pressure resistance performance can be prevented from lowering and fluid leakage can be prevented, as compared with the conventional device in which the frictional resistance between the two is small. Performance can be improved.
Further, even if a fluid such as water or oil adheres to the spiral convex portion B1 of the spiral concave-convex tube B ', the strength of the spiral concave-convex tube B' can be maintained, and a reduction in pressure resistance performance and fluid leakage can be reliably prevented. .

Furthermore, it is preferable to arrange a plurality of the locking portions 4 at equal intervals in the circumferential direction in the tightening band 1.
In this case, even if the tightening band 1 is set in an eccentric state with respect to the tube B (spiral uneven tube B ') into which the nipple C1 is inserted, even if the tightening band 1 is The plurality of locking claws 4a of the locking portion 4 bite into the outer surface of the tube B (fit into the spiral concave portion B2 of the spiral concave / convex tube B '), so that the tube B (spiral) with respect to the nipple C1. The concave-convex tube B ') is retained in the axial direction.
Therefore, regardless of the mounting accuracy of the tightening band 1, the tube B (spiral uneven tube B ') can be reliably prevented from falling off and held.
As a result, safety can be further improved.

By the way, the end portion B5 of the tubular body B (spiral uneven tube B ') into which the nipple C1 is inserted is compared with the other part of the tubular body B (spiral uneven tube B'). Even if the tube B (spiral uneven tube B ') expands or the tube B (spiral uneven tube B') bends and deforms due to an increase in the pressure of the fluid passing through the inside of the tube, the tube B (the spiral uneven tube B ') is hardly affected by these effects and moves. hard.
Therefore, it is preferable to arrange the locking portion 4 so as to face the end portion B5 of the tube B (spiral uneven tube B ') into which the nipple C1 is inserted.
In this case, with the bulging of the tube B (spiral uneven tube B ') due to the increase in the pressure of the fluid and the bending deformation of the tube B (spiral uneven tube B'), the locking claw 4a of the locking portion 4 is formed. Does not bite into the outer surface of the tube B more than necessary (does not fit into the spiral concave portion B2 of the spiral uneven tube B ').
Therefore, it is possible to prevent the tubular body B (spiral uneven tube B ') from being damaged due to excessive biting into the outer surface of the tubular body B (forceful fitting of the spiral uneven tube B' into the spiral concave portion B2).
As a result, the tubular body B (spiral uneven tube B ') can be retained and retained for a long time.

In addition, according to the pipe fastener D according to the embodiment of the present invention (attached to the nipple C1 so as not to be movable in the axial direction), the nipple C1 is inserted into the pipe B (spiral uneven pipe B '). The tightening band 1 is set so that the tube B (spiral uneven tube B ') is sandwiched between the tightening band 1 and the nipple C1, and the tightening band 1 is positioned in the axial direction with respect to the nipple C1. The locking portion 4 protruding from the tube B is cut into the outer surface of the tube B (the locking claw 4a is fitted into the spiral concave portion B2 of the spiral uneven tube B '). As a result, the pressure of the fluid passing through the inside of the tube B (spiral uneven tube B ') increases, or the tube B (spiral uneven tube B') is pulled in the tube removal direction F with respect to the nipple C1. Also, when the locking portion 4 bites into the outer surface of the tubular body B (fits into the spiral concave portion B2 of the spiral uneven tube B '), the tubular body B (spiral uneven tube B') is moved in the axial direction with respect to the nipple C1. Is retained.
Therefore, the tube B (spiral uneven tube B ') can be securely held by the tightening band 1 so that the tube B (spiral concave / convex tube B') cannot be pulled out with a simple structure.
As a result, the inner peripheral surface of the clip only partially comes into contact with the tip of the helical convex portion, so that the pressure resistance performance can be prevented from lowering and fluid leakage can be prevented, as compared with the conventional device in which the frictional resistance between the two is small. Performance can be improved.
Further, even if a fluid such as water or oil adheres to the outer surface of the tubular body B (spiral convex portion B1 of the spirally uneven tube B '), the detachment strength of the tubular body B (spirally uneven tube B') can be maintained. In addition, it is possible to reliably prevent a decrease in pressure resistance performance and fluid leakage.

Further, it is preferable that the tightening band 1 of the pipe tightening tool D is a clip band whose diameter is reduced by spring elasticity.
In this case, when the user releases the operation unit 2 of the tightening band 1, the diameter of the operation unit 2 is reduced by spring elasticity, and the spiral uneven tube B is tightened.
Therefore, the spiral elastic tube B can be tightly held by the simple operation by the spring elasticity of the tightening band 1 so that it cannot be pulled out.
As a result, workability can be improved.

  In the illustrated example shown above, the case where the tightening band 1 is a clip band whose diameter is reduced by spring elasticity is shown, but the present invention is not limited to this. Instead of the clip band, the operating unit 2 is attached to the tightening band 1. The inner peripheral surface 1a of the tightening band 1 may be reduced in diameter by the rotation operation of the worm provided as described above, and the spiral uneven tube B may be tightened.

A Pipe fastening structure B Pipe B 'Spiral uneven tube B1 Spiral convex part B2 Spiral concave part B5 End part C Joint C1 Nipple D Pipe tightening tool 1 Tightening band 2 Operating part 3 Retaining part 4 Locking part 4a Locking claw

Claims (5)

A nipple inserted into an elastically deformable spiral concave-convex tube having a spiral convex portion and a spiral concave portion on the outer surface ,
An engaged portion provided on the nipple;
A tightening band that is provided so as to be deformable in the radial direction with the spiral uneven tube between the nipple and tightens the spiral uneven tube ,
An operation unit for elastic deformation provided on the tightening band;
Wherein the one axial end of the tension band said to protrude toward axis direction engaged portion that engages the engaged portion in the axial direction, to position the front Symbol tension band against said nipple in the axial direction A retaining portion provided so that
A locking portion provided in a protruding shape in the axial direction along the outer surface of the spiral concave-convex tube from one end in the axial direction of the tightening band ,
The locking portion includes a tube fastening structure, wherein Rukoto which have a locking claw which is formed so as to engage the axially fitted into the spiral recess of inserting the nipple the helical irregularity tube . The protrusion length of the locking claw is set in accordance with the pitch in the axial direction of the spiral concave portion in the spiral concave-convex tube, and the distal end portion of the locking claw faces the spiral concave portion in the radial direction. The pipe fastening structure according to claim 1 , wherein the position is adjusted .   The pipe fastening structure according to claim 1, wherein a plurality of the locking portions are arranged at equal intervals in a circumferential direction of the tightening band. 4. The pipe fastening structure according to claim 1, wherein the locking portion is disposed so as to face an end portion of the spiral uneven tube into which the nipple is inserted. 5. A pipe fastener that is axially immovably attached to a nipple inserted into an elastically deformable spiral concave / convex pipe having a spiral convex part and a spiral concave part on an outer surface ,
A tightening band that is provided so as to be deformable in the radial direction with the spiral uneven tube between the nipple and tightens the spiral uneven tube ,
An operation unit for elastic deformation provided on the tightening band;
By axially projecting from one axial end of the tightening band toward an engaged portion provided on the nipple and engaging with the engaged portion in the axial direction, the tightening band is axially moved with respect to the nipple. A retaining portion provided for positioning,
A locking portion provided in a protruding shape in the axial direction along the outer surface of the spiral concave-convex tube from one end in the axial direction of the tightening band ,
The locking portion includes a tube fastening structure, wherein Rukoto which have a locking claw which is formed so as to engage the axially fitted into the spiral recess of inserting the nipple the helical irregularity tube .

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