WO2015156198A1

WO2015156198A1 - Pipe fitting

Info

Publication number: WO2015156198A1
Application number: PCT/JP2015/060440
Authority: WO
Inventors: 明広稲垣; 修司杉田; 伸二瀧本
Original assignee: 株式会社トヨックス
Priority date: 2014-04-11
Filing date: 2015-04-02
Publication date: 2015-10-15
Also published as: MY183261A; CN106170655A; CN106170655B; JP2015203439A; JP5953586B2; TWI639789B; TW201600788A

Abstract

An extra-thick portion in an elastic sleeve is prevented from being jammed between the peripheral end parts of a plurality of divided holders, and the plurality of divided holders are tightened using fastening members. A plurality of divided holders (3) are moved radially closer together by fastening members (4), whereby an elastic sleeve (2) contracts and deforms to create an extra-thick portion (2c). Even when the extra-thick portion (2c) displays a tendency to expand in between the peripheral end parts (3a) of peripherally adjacent divided holders (3) in accompaniment with the subsequent contraction and deformation of the elastic sleeve (2), the guide surfaces (5a) of a stopper member (5) come into contact in the radial direction from the outer side of the extra-thick portion (2c), whereby the expansion of the extra-thick portion (2c) is suppressed and the extra-thick portion (2c) is guided in the peripheral direction without coming between the peripheral end parts (3a) of the plurality of divided holders (3).

Description

Pipe fitting

The present invention relates to a pipe joint used for pipe-connecting a flexible deformable hose or tube formed of a soft material such as synthetic resin or rubber, or a pipe body such as an undeformable pipe. .

Conventionally, as this kind of pipe joint, a nipple into which a hose can be inserted, a semi-cylindrical upper shell and a lower shell that can be fitted into the nipple, an elastic deformation ring for tightening the hose, and an upper shell There is a hose connector for preventing leakage by inserting a bolt into the bolt hole at the end of the lower shell and tightening the upper shell and the lower shell so that the elastic deformation ring is deformed and uniformly eats into the outer periphery of the hose (for example, , See Patent Document 1).
More specifically, at the start of tightening of the upper shell and the lower shell by bolts, the upper shell and the lower shell are arranged away from each other in the radial direction. By tightening the bolts, the upper shell and the lower shell gradually move in the radial direction so as to sandwich the elastic body deforming ring, and the elastic body deforming ring is reduced in diameter as the upper shell and the lower shell move closer. It is configured.

JP 2009-85275 A

By the way, if the upper shell and the lower shell are moved closer to each other by tightening the bolt and the elastic body deforming ring is forcibly deformed, the elastic body deforming ring is reduced in diameter by any amount in the circumferential direction of the elastic body deforming ring. A surplus part of the meat occurs. The surplus portion gradually increases in the radial direction and the axial direction as the elastic body deforming ring is reduced in diameter.
However, in such a conventional pipe joint, since the end portions of the upper shell and the lower shell are opened apart from the start of tightening with the bolt to immediately before the end, the elastic deformation ring is reduced in diameter. The surplus portion generated by this bulges into the opening between the end portions of the upper shell and the lower shell and enters between them.
Once the surplus part of the elastic deformation ring is bitten, the upper shell and the lower shell cannot be moved closer to each other even if tightened with bolts. Therefore, the upper shell and the lower shell cannot be closed (completely tightened) to a preset approach end position with a bolt. In this situation, there is a problem that tightening of the elastic deformation ring with respect to the hose is loosened particularly at the surplus part and becomes non-uniform as a whole, and the disconnection strength of the hose is lowered and a fluid leakage accident is likely to occur. It was.
Furthermore, if the elastic body deforming ring is made thick in order to increase the tightening force of the hose, the elastic body deforming ring bulges toward the opening between the end portions of the upper shell and the lower shell as the elastic body deforming ring is forcibly deformed. The volume of the surplus part that deforms increases. As a result, the biting amount of the surplus portion is increased, and there is a problem that the hose pull-out strength is further reduced.

It is an object of the present invention to cope with such a problem, and prevents a surplus portion of an elastic sleeve from being bitten between the peripheral end portions of the plurality of split holders. For example, it is intended to tighten the screw with a tightening member.

In order to achieve such an object, the present invention provides a nipple provided along an insertion space of a tubular body and an outer periphery of the insertion space of the tubular body formed along an outer peripheral surface of the nipple. A radially deformable elastic sleeve, a plurality of split holders provided on the outer side of the elastic sleeve so as to cover the outer surface of the elastic sleeve in the circumferential direction and separable in the radial direction, and provided across the plurality of split holders And a clamping member that moves the plurality of divided holders closer to each other in the radial direction so that the elastic sleeve is deformed in a reduced diameter, and an inner surface of a peripheral end portion of the plurality of divided holders adjacent in the circumferential direction. A stopper member provided so as to face the outer surface of the elastic sleeve in the radial direction, and the stopper member includes a plurality of divided holders formed by the fastening members. And having the abutting guide surfaces to meat odd site and radially elastic sleeve which is shrink-deformed with the near mobile.

In the present invention having the above-described features, the elastic sleeve is reduced in diameter by moving the plurality of divided holders close to each other in the radial direction with the fastening member, and a surplus portion is generated. The guide surface of the stopper member from the outside of the surplus portion even if the surplus portion is about to bulge between the peripheral end portions of the plurality of divided holders adjacent to each other in the circumferential direction as the elastic sleeve is reduced in diameter. Swells in the radial direction to suppress the swelling of the surplus portion, and the surplus portion does not enter between the peripheral end portions of the plurality of divided holders, and is guided in the circumferential direction.
Accordingly, it is possible to prevent the surplus portion of the elastic sleeve from being bitten between the peripheral end portions of the plurality of divided holders, and to tighten the plurality of divided holders with the fastening members.
As a result, the ends of the upper shell and the lower shell are separated from the start of tightening with bolts to just before the end, and compared with the conventional one that bites the surplus part generated due to the reduced diameter deformation of the elastic deformation ring The fastening of the elastic sleeve to the tube body can be made uniform as a whole without being loosened at the surplus portion, the pull-out strength of the tube body can be improved, the fluid leakage accident can be surely prevented, and the safety is excellent.
In addition, it is possible to prevent the excess portion from biting between the peripheral ends of multiple split holders regardless of the thickness of the elastic sleeve, so that the tube can be tightened more strongly with the thick elastic sleeve. It becomes. Thereby, the pull-out strength of the tubular body can be further improved, and a fluid leakage accident can be reliably prevented over a long period of time.

It is explanatory drawing which shows the whole structure of the pipe joint which concerns on embodiment of this invention, (a) is a side view before clamping, (b) is along the (1B)-(1B) line | wire of Fig.1 (a). It is a vertical front view. It is explanatory drawing which shows the state after the clamping | tightening, (a) is a side view, (b) is a longitudinal front view along the (2B)-(2B) line | wire of Fig.2 (a). It is a perspective view which shows the connection method with the pipe body by the pipe joint which concerns on embodiment of this invention, (a) is an exploded perspective view before a connection, (b) is an external appearance perspective view of an assembly | attachment start state, (c) ) Is an external perspective view before tightening, and (d) is an external perspective view after tightening. It is explanatory drawing which shows the modification of a coupling main body, (a) is a disassembled perspective view before a connection, (b) is an external perspective view of the assembly | attachment start state, (c) is an external perspective view before clamping, (d ) Is an external perspective view after tightening. It is explanatory drawing which shows the modification of an elastic sleeve, (a) is an exploded perspective view before a connection, (b) is an external appearance perspective view of the assembly | attachment start state, (c) is an external perspective view before clamping, (d ) Is an external perspective view after tightening.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 5, the pipe joint A according to the embodiment of the present invention inserts the connection end Ba of the pipe body B between the nipple 1 and the elastic sleeve 2 of the joint body 10, This is a connector for covering a plurality of divided holders 3 on the outside and moving the plurality of divided holders 3 toward each other in the radial direction with a fastening member 4 so as to be connected in a cylindrical shape.
By moving the plurality of divided holders 3 closer by the fastening member 4, the elastic sleeve 2 is deformed in a reduced diameter, and the inner surface 2 a of the elastic sleeve 2 is moved around the outer surface B 1 of the connection end portion Ba of the tubular body B. It adheres substantially evenly over. At the same time, the inner surface B2 of the tube B is brought into close contact with the outer peripheral surface 1a of the nipple 1 and is detachably connected to the pipe. Thereby, even a large-diameter tube B having a relatively large diameter can be easily connected, and assembly and disassembly can be easily cleaned.
More specifically, the pipe joint A according to the embodiment of the present invention includes a nipple 1 provided along the insertion space S of the pipe body B, and an insertion space S of the pipe body B formed along the outer peripheral surface 1a of the nipple 1. An elastic sleeve 2 provided so as to surround the outer periphery, a plurality of split holders 3 provided so as to cover the outer surface 2b of the elastic sleeve 2 in the circumferential direction and separable in the radial direction, and a plurality of split holders 3 extending across the plurality of split holders 3. A clamping member 4 provided so as to move the divided holders 3 toward each other in the radial direction, a stopper member 5 provided across the inner side surface 3b of the peripheral end portions 3a of the plurality of divided holders 3 adjacent in the circumferential direction, As a major component.
As shown in FIGS. 1 to 5, the insertion direction N of the tube body B with respect to the insertion space S is referred to as “the tube insertion direction N”, and the reverse direction U of the tube insertion direction N is referred to as “the tube removal”. It is referred to as “direction U”.

The joint body 10 is made of, for example, a hard material such as stainless steel or brass, which is hard to rust, or a rigid material such as a hard synthetic resin. The joint body 10 is formed in a substantially cylindrical shape with a large thickness, or is formed by pressing or other forming process. The The joint body 10 includes a cylindrical nipple 1 and a connection portion 11 for connecting to another pipe body (not shown) or a pipe connection port (not shown) of another device.
The nipple 1 is formed on the distal end side of the joint body 10, and the connection portion 11 is formed on the proximal end side of the joint body 10.

The outer diameter of the nipple 1 is formed to be substantially the same as, or slightly larger than, or slightly smaller than the inner diameter of the tube B described later.
The outer peripheral surface 1a of the nipple 1 is provided with an unevenness for preventing the tube from coming off at a predetermined position in the axial direction so as to face the inner surface 2a of the elastic sleeve 2 described later across the insertion space S of the tube B in the radial direction. It is preferable to have the part 1b and the retaining means 1c for restricting the position of the later-described split holder 3 so that it cannot move in the axial direction.
As a specific example of the nipple 1, as shown in FIGS. 3 (a) to 3 (d), as a concavo-convex portion 1b for preventing the tube from being removed only at the tip portion (end portion in the tube removal direction U) of the outer peripheral surface 1a, A plurality of annular concave portions and annular convex portions are alternately and continuously formed in the axial direction. Between the base end side (the back side in the tube insertion direction N) of the outer peripheral surface 1a and the connecting portion 11, a locking portion 1c1 that is annularly continuous in the circumferential direction is formed as a retaining means 1c for the split holder 3. is doing.
Although not shown in the drawings as another example, the concave and convex portion 1b for preventing the tube from being removed is formed in a bamboo slab shape in which the annular concave portions and the annular convex portions are alternately continuous in the axial direction over the substantially entire length of the outer peripheral surface 1a of the nipple 1. It is also possible to provide or change an annular seal material that is in pressure contact with the inner surface B2 of the tubular body B in the outer peripheral surface 1a of the nipple 1 in the radial direction. Further, as the retaining means 1c for the split holder 3, a locking portion 1c1 divided in the circumferential direction may be formed to project, or a concave locking portion 1c1 continuous or divided in the circumferential direction may be formed or changed. Is possible.

The elastic sleeve 2 is made of a material having excellent heat resistance and elastically deformable, such as rubber and soft synthetic resin. The elastic sleeve 2 is formed in a substantially cylindrical shape that can be elastically deformed at least in the radial direction, and is formed outside the outer peripheral surface 1 a of the nipple 1. The tubular body B is assembled so as to face the radial direction across the insertion space S. The elastic sleeve 2 has an inner surface 2a that faces the outer surface B1 of the connection end Ba of the tube body B mounted on the outer side of the outer peripheral surface 1a of the nipple 1 at the time of assembly, and a plurality of divided holders to be described later. 3 has an inner surface 3b and a radially outer surface 2b.
The inner surface 2a of the elastic sleeve 2 is set so that the inner diameter at the time of diameter expansion is substantially the same as or slightly larger than the outer diameter of the tube B to be described later, and the inner diameter at the time of contraction is the outer diameter of the tube B. It is set to be smaller.
Further, the outer surface 2b of the elastic sleeve 2 is set so that the outer diameter at the time of diameter expansion is larger than the inner diameter at the time when the approaching movement of a plurality of divided holders 3 described later is completed. That is, it is set to be larger than the inner diameter of the inner side surface 3b of the plurality of divided holders 3 when the approaching movement of the plurality of divided holders 3 is completed and further approaching movement becomes impossible.
Further, the elastic sleeve 2 is formed with a plurality of notches 2c for smoothly elastically deforming in the radial direction at predetermined intervals in the circumferential direction, so that a sufficient inner diameter difference can be obtained at the time of diameter expansion deformation and diameter reduction deformation. It is preferable that the outer diameter difference be generated.

The split holder 3 is formed in a shape in which a cylindrical body formed of a rigid material such as a hard synthetic resin or a metal such as stainless steel or brass that is hard to rust is divided into a plurality in the circumferential direction.
As shown in FIGS. 3A and 3B, the plurality of divided holders 3 are assembled so as to surround the outer surface 2b of the elastic sleeve 2 from the outside. In this assembled state, it has a plurality of circumferential end portions 3a adjacent to each other in the circumferential direction, and a plurality of inner side surfaces 3b respectively opposed to the outer surface 2b of the elastic sleeve 2 in the radial direction.
The peripheral end portions 3a of the plurality of divided holders 3 are formed so as to protrude at least one pair radially outward with respect to the respective divided holders 3 and have end surfaces 3c that face substantially parallel to the circumferential direction.
Furthermore, the fastening member 4 mentioned later is provided over the peripheral edge part 3a of the some division | segmentation holder 3 adjacent to the circumferential direction. As shown in FIG. 3 (c), by operating the fastening member 4, the plurality of divided holders 3 are moved closer to each other in the radial direction, and the sleeve 2 is reduced in diameter. The inner side surfaces 3b of the plurality of split holders 3 are formed in arcuate surfaces in which the inner side surfaces 3b of the plurality of split holders 3 are continuously formed into a perfect circle when the approaching movement of the plurality of split holders 3 by the fastening member 4 is completed. Has been. The inner surface 3b of each divided holder 3 is preferably provided with a step 3d for positioning the elastic sleeve 2 in the axial direction.
Further, any one of the plurality of split holders 3 or all of the split holders 3 are formed with locking portions 3e that engage with the retaining means 1c of the nipple 1 so as not to move in the axial direction.

As a specific example of the plurality of split holders 3, as shown in FIGS. 1 to 5, a first split holder 31 and a first split holder 31 formed into a symmetric semi-cylindrical shape by dividing a cylindrical body into two in the circumferential direction. A two-divided holder 32 is used. Each of the first divided holder 31 and the second divided holder 32 has a pair of peripheral end portions 3a.
A hook that engages with the locking portion 1c1 of the nipple 1 in the axial direction as a locking portion 3e at the base end portion (the back end portion in the tube insertion direction N) of the first split holder 31 and the second split holder 32. Each is formed to protrude.
Although not shown as other examples, the cylindrical body is divided into three parts, four parts or more in the circumferential direction, and each of them is moved closer to a plurality of radial directions by a fastening member 4 described later, It is also possible to form or change the locking portion 3e at either one of the base end portions of the one split holder 31 and the second split holder 32.

The fastening member 4 is formed at the head portion 4a having a tool engagement portion 4a1 that engages with a tool (not shown) such as a wrench or spanner, a shaft portion 4b continuous to the head portion 4a, and a tip of the shaft portion 4b. It is preferable to use a screw component such as a bolt having a threaded portion 4c. In the illustrated example, the tool engagement portion 4a1 is an engagement recess such as a hexagonal hole.
When a screw component is used as the fastening member 4, a through hole 3 f opened in one of the peripheral end portions 3 a of the plurality of divided holders 3 adjacent in the circumferential direction and a screw hole 3 g opened in the other are used. It is inserted through. In this inserted state, a tool such as a wrench or a wrench is engaged with the tool engaging portion 4a1 of the screw part and rotated.
Thereby, a pair of 1st division | segmentation holder 31 and the 2nd division | segmentation holder 32 move mutually close to radial direction, and the diameter reduction deformation | transformation of the sleeve 2 is carried out. Furthermore, since it can be tightened with a relatively small tool such as a wrench or spanner, even a large-diameter pipe joint A for connecting a large-diameter pipe body B can be easily connected and assembled and disassembled. Suitable for easy cleaning.
Although not shown in the drawings as other examples, as the fastening member 4, the tool engagement portion 4 a 1 may be a bolt in which the outer surface of the head 4 a is formed in a polygon such as a hexagon, or a fastening component other than a screw component may be used. It is also possible to do.

The stopper member 5 is a component for suppressing partial bulging deformation of the elastic sleeve 2 formed of a material such as polyacetal resin or other synthetic resin having excellent surface slipperiness and heat resistance. . As shown in FIGS. 1 to 5, a plurality of the stopper members 5 are respectively arranged between the peripheral end portions 3a of the plurality of divided holders 3 adjacent in the circumferential direction. The stopper member 5 has a guide surface 5 a that is opposed to and comes into contact with the surplus portion 2 c of the elastic sleeve 2 that has undergone a diameter reduction deformation as the plurality of divided holders 3 approach each other by the fastening member 4.
The guide surface 5 a is a surface that is formed inside the stopper member 5 so as to be continuous with the inner surface (arc surface) 3 b of the plurality of divided holders 3. As shown in FIGS. 1 (a), 1 (b) and 3 (c), it is formed so as to be wider than the interval between the end faces 3c of the circumferential end portions 3a adjacent to each other in the circumferential direction at the start of fastening by the fastening member 4. ing. That is, at the start of tightening by the tightening member 4 shown in FIGS. 1A, 1B, and 3C, both circumferential ends of the guide surface 5a and the inner surfaces (arc surfaces) 3b of the plurality of divided holders 3 are used. It is set so that there is no gap between it and the circumferential edge.

As a specific example of the stopper member 5, as shown in FIG. 1 to FIG. 5, it extends over the inner side surface 3b of the peripheral end portion 3a of the plurality of divided holders 3 (first divided holder 31 and second divided holder 32). It is preferable to use a spacer 51 that is provided so as not to move at least in the circumferential direction. An arcuate guide surface 5 a is preferably formed inside the spacer 51.
The spacer 51 preferably has positioning means 5b for the spacer 51 with respect to the plurality of divided holders 3 and a through portion 5c through which the fastening member (screw component) 4 passes.
As the through portion 5c, a through hole as shown in FIGS. 1 to 5 or a notch such as a “U-shape” is used.

On the other hand, the tubular body B is preferably a soft synthetic resin such as vinyl chloride, a soft material such as silicone rubber or other rubber, and is preferably a flexible material such as a hose or a tube that is formed to be elastically deformable. . Furthermore, it is preferable that the inner surface B1 and the outer surface B2 are flat at least at the connection end Ba of the tube body B.
As a specific example of the tube B, a hose having a single layer structure is used in the illustrated example.
Although not shown in the drawings as another example, it is possible to use a multi-layered tube as the tube B instead of a single-layered tube. As a specific example of various types of tube B, a laminate in which a plurality or a single synthetic resin blade (reinforcing yarn) is embedded in a spiral as an intermediate layer between an outer layer and an inner layer that are transparent or opaque A hose (blade hose) or a spiral reinforcing hose (forlan hose) in which a strip reinforcing material such as a synthetic resin or metal cross section rectangle as an intermediate layer and a linear reinforcing material such as a circular cross section are spirally wound and integrated. And a spiral reinforcing hose in which a metal wire or a hard synthetic resin wire is embedded in a spiral shape.

According to such a pipe joint A according to the embodiment of the present invention, first, as shown in FIGS. 3A and 3B, after inserting the connection end portion Ba of the tube body B into the elastic sleeve 2, The tube is inserted in the tube insertion direction N along the outer peripheral surface 1a of the nipple 11. A plurality of split holders 3 (first split holder 31 and second split holder 32) and the stopper member 5 are assembled to the outside so as to cover the outer surface 2b of the elastic sleeve 2 in the circumferential direction.
Subsequently, as shown in FIGS. 1 (a), 1 (b) and 3 (c), a plurality of divided holders 3 are moved closer to each other in the radial direction by a fastening member (screw part) 4, thereby allowing elasticity. The sleeve 2 is deformed to reduce the diameter, and a surplus portion 2c is generated.
The excess portion 2c gradually increases in the radial direction and the axial direction as the elastic sleeve 2 is subsequently reduced in diameter, and the excess portion 2c having nowhere to go is a plurality of divided holders 3 adjacent in the circumferential direction. It tends to bulge out between the peripheral end portions 3a. However, the guide surface 5a of the stopper member 5 abuts in the radial direction from the outside of the surplus portion 2c of the elastic sleeve 2, thereby suppressing the swelling of the surplus portion 2c, and the peripheral end portions of the plurality of divided holders 3 The excess part 2c does not enter between 3a and is guided in the circumferential direction.
Thereby, as shown in FIGS. 2A, 2B, and 3D, the excess portion 2c of the elastic sleeve 2 is bitten between the peripheral end portions 3a of the plurality of divided holders 3. It is possible to prevent the plurality of divided holders 3 from being tightened (tightly tightened) by the tightening member 4.
Accordingly, the elastic sleeve 2 can be tightened with respect to the tube body B without being loosened at the surplus portion 2c, and can be made uniform as a whole. , Fluid leakage accidents can be reliably prevented and safety is excellent.
Further, since it is possible to prevent the excess portion 2c from being caught between the peripheral end portions 3a of the plurality of divided holders 3 regardless of the thickness of the elastic sleeve 2, the tubular body B is formed with the thick elastic sleeve 2. It becomes possible to tighten more strongly. Thereby, the pull-out strength of the tube B can be further improved, and a fluid leakage accident can be reliably prevented over a long period of time.

In particular, the stopper member 5 is a spacer 51 that is provided so as not to move in the circumferential direction over the inner side surface 3 b of the peripheral end portion 3 a of the plurality of divided holders 3, and has an arcuate guide surface 5 a inside the spacer 51. It is preferable.
In this case, as the plurality of divided holders 3 are moved closer to each other by the fastening member 4, the elastic sleeve 2 is deformed in a reduced diameter and is directed between the peripheral end portions 3a of the plurality of divided holders 3 adjacent in the circumferential direction. Even if the surplus portion 2c of the elastic sleeve 2 bulges outward in the radial direction, the surplus portion 2c hits the arcuate guide surface 5a of the spacer 51 serving as the stopper member 5, and then smoothly in the circumferential direction. It is guided by sliding.
Therefore, the elastic sleeve 2 can be uniformly reduced in diameter in the circumferential direction.
As a result, the inner surface 2a of the elastic sleeve 2 can be evenly adhered to the outer surface B1 of the tubular body B over the entire circumference, and sealing can be further achieved.

Next, each embodiment of the present invention will be described with reference to the drawings.
In the first embodiment, as shown in FIGS. 2A, 2B and 3D, the stopper member 5 is a stopper for a plurality of divided holders 3 (first divided holder 31, second divided holder 32). As the positioning means 5b of the member 5, a protruding piece 5b1 parallel to the end surface 3c of the peripheral end 3a of the plurality of divided holders 3 adjacent in the circumferential direction is provided. Furthermore, the end face 3c of the peripheral end 3a and the projecting piece 5b1 are set to contact each other at the end of the approaching movement of the plurality of divided holders 3 by the fastening member 4.
The protruding piece 5b1 is formed so as to protrude in a plate shape parallel to the end surface 3c of the peripheral end 3a adjacent in the circumferential direction outside the stopper member 5 (spacer 51).

Further, the stopper member 5 includes a long hole 5c1 that is elongated in the radial direction as the through portion 5c of the fastening member (screw component) 4, and the inner side surface 3b of the peripheral end portion 3a of the plurality of divided holders 3 and the circumferential direction. It is preferable to have a sliding contact portion 5d that is in sliding contact with each other.
A pair of sliding contact portions 5d is formed on the outer side of the stopper member 5 (spacer 51) in the circumferential direction with the protruding piece 5b1 interposed therebetween, and each of the sliding contact portions 5d may be formed in a tapered shape that gradually becomes thinner toward the circumferential edge. preferable.
Moreover, it is preferable to have the taper-shaped inclination recessed part 3b1 which becomes thin gradually toward the circumferential direction edge which slidably contacts with the sliding contact part 5d in the inner surface 3b of the peripheral edge part 3a of the some division | segmentation holder 3. FIG.

According to such a pipe joint A according to the first embodiment of the present invention, the end surface 3c of the peripheral end portion 3a and the protruding piece 5b1 come into contact with each other at the end of the approaching movement of the plurality of divided holders 3 by the fastening member 4, The tightening member 4 cannot be tightened any further.
Therefore, the fastening completion state by the fastening member 4 can be made constant regardless of the operator's sense.
As a result, management of the tightening torque by the tightening member 4 becomes unnecessary, and there is an advantage that uniform piping connection is possible no matter who works.

In the first embodiment, as shown in FIGS. 1 to 3, the fastening member 4 is provided at one of the head 4a and the peripheral end portions 3a of the plurality of divided holders 3 adjacent in the circumferential direction. This is a screw component having a shaft portion 4b through which the through-hole 3f is inserted and a screw portion 4c that is screwed into a screw hole 3g formed in the other. The shaft portion 4b is formed to have a smaller diameter than the outer diameter of the head portion 4a and the screw portion 4c. The shaft portion 4b is formed such that the maximum outer diameter of the screw portion 4c is larger than the minimum inner diameter of the through hole 3f through which the screw portion is inserted in the axial direction.
In the example shown in FIGS. 1 to 3, through holes 3f are opened in the peripheral end 3a of the first divided holder 31, and screw holes 3g are penetrated in the peripheral end 3a of the second divided holder 32, respectively. Or open in a concave shape.
That is, in the through hole 3f and the screw hole 3g, a female screw having the same inner diameter that is screwed with the screw part 4c of the fastening member (screw part) 4 is engraved, and the screw part 4c and the female screw of the through hole 3f are engraved. By screwing the male screw, the shaft portion 4b is inserted through the through hole 3f. When the shaft portion 4b is inserted through the through hole 3f, the head portion 4a and the screw portion 4c abut against the through hole 3f in the axial direction and are prevented from coming off.
Therefore, there is an advantage that the fastening member (screw part) 4 can be prevented from falling off from the peripheral end portion 3a of the split holder 3.
As a result, it can be used in industries such as food factories and pharmaceutical factories where handling of foreign matters is difficult to deal with and is excellent in safety.

In particular, when the split holder 3 and the fastening member (screw part) 4 are made of metal, as shown in FIGS. 1B and 2B, the plurality of split holders 3 adjacent in the circumferential direction are arranged. A through hole 3f provided in either one of the peripheral end portions 3a (the first divided holder 31) is a counterbore. It is preferable that a washer 4d made of synthetic resin or the like having excellent slipperiness is sandwiched between the counterbore and the head 4a of the tightening member (screw part) 4 to be tightened.
When configured in this way, along with tightening of the tightening member (screw part) 4, the head 4a does not generate adhesive wear (galling) due to frictional heat with the through hole (counterbore hole) 3f, Metal powder is not generated by friction between the two.
As a result, it can be used in industries such as food factories and pharmaceutical factories where handling of foreign matters is difficult to deal with and is excellent in safety.
Further, the contact portion between the tightening member (screw part) 4 and the through hole 3f or the screw hole 3g, or the through part 5c (long hole 5c1) of the shaft part 4b of the screw part and the positioning means 5b (protrusion piece 5b1) of the stopper member 5. It is preferable to apply or fill a lubricant to the contact portion with the above.
The tightening torque due to the tightening member (screw part) 4 can be further reduced by the washer 4d and the lubricant having excellent slipperiness.

Further, the stopper member 5 is slidably contacted in the circumferential direction with the long hole 5c1 formed in the radial direction as the through portion 5c of the fastening member 4 and the inner side surface 3b of the peripheral end portion 3a of the plurality of divided holders 3. 5d, and the inner side surface 3b of the peripheral end 3a of the plurality of divided holders 3 has an inclined recess 3b1 that gradually becomes thinner toward a circumferential edge that is in sliding contact with the sliding contact 5d. Is preferred.
In this case, the tapered inclined concave portion 3 b 1 slides along the sliding contact portion 5 d of the stopper member 5 as the plurality of divided holders 3 are moved closer by the fastening member 4. Thereby, the stopper member 5 moves smoothly inward in the radial direction along the long hole 5 c 1 with respect to the fastening member 4.
Therefore, the tightening torque by the tightening member 4 can be reduced.
As a result, the workability is excellent, and there is an advantage that even the powerless worker such as a woman can tighten (completely tighten) the split holder 3 with the tightening member 4.

The long hole 5c1 is inserted through the shaft portion 4b and the screw portion 4c of the tightening member (screw component) 4 when the stopper member 5 is assembled. However, after the stopper member 5 is assembled, the inner diameter in the short direction of the long hole 5c1 is smaller than the maximum outer diameter of the head part 4a and the screw part 4c of the fastening member (screw part) 4 and larger than the outer diameter of the shaft part 4b. It is also bigger.
That is, the entire stopper member 5 is made of an elastically deformable material, and the inner diameter in the short direction of the long hole 5c1 is slightly smaller than the outer diameter of the screw part 4c, so that the long hole 5c1 is formed when the screw part 4c is inserted. It is formed to expand and contract in the short direction. In the illustrated example, the long hole 5c1 is formed in an “eight-letter shape” that connects a large circular portion slightly smaller in diameter than the outer diameter of the screw portion 4c and a small circular portion having the same diameter as the outer diameter of the shaft portion 4b. Has been.
As another example, by engraving a female screw having the same inner diameter that is screwed into the screw portion 4c of the tightening member (screw component) 4 in a part of the long hole 5c1, when the stopper member 5 is assembled, A structure in which the screw portion 4c of the fastening member (screw part) 4 can be inserted is used, or the shape is changed to another shape such as an ellipse instead of the “eight-shape” in which the large circular portion and the small circular portion are connected. It is also possible.
Thereby, after the stopper member 5 is assembled, the elongated hole 5c1 of the stopper member 5 is caught by the screw portion 4c of the fastening member (screw part) 4 and is prevented from coming off.
Therefore, there is an advantage that the stopper member 5 can be prevented from falling off from the peripheral end portion 3a of the split holder 3.
As a result, it can be used in industries such as food factories and pharmaceutical factories where handling of foreign matters is difficult to deal with and is excellent in safety.
Further, even if an external force such as vibration or impact is applied to the divided holder 3 or the fastening member 4 during or after the plurality of divided holders 3 are moved closer to each other by the fastening member 4, the stopper member 5 is stopped by the fastening member 4. Does not shift in the axial direction.
Therefore, the stopper member 5 can be positioned in the axial direction with a simple structure.
As a result, it is possible to prevent the stopper member 5 from being unexpectedly displaced in the axial direction and causing the excess portion 2c of the elastic sleeve 2 to bulge out, which is excellent in completeness and at the same time without increasing the cost. Excellent economic efficiency.

In addition, in the example shown in FIGS. 1 to 3, a cylindrical part 11 a such as a ferrule or a bush is integrally formed on the proximal end side of the joint body 10 as a connection portion 11 so as to connect to another pipe body. .
Further, in the example shown in FIGS. 1 to 3, a rubber sleeve 21 is used as the elastic sleeve 2. As shown in FIGS. 3 (a) to 3 (d), a plurality of concave grooves 2c1 extending linearly in the axial direction are formed as recesses 2c in the inner surface 2a of the rubber sleeve 21 at predetermined intervals in the circumferential direction. ing.
The surface of the elastic sleeve 2 is provided with a mark 2e for indicating between a plurality of notches 2c (concave grooves 2c1) adjacent in the circumferential direction. In the illustrated example, four marks 2 e are arranged in the circumferential direction of the elastic sleeve 2 on the outer surface 2 b and the end surface of the elastic sleeve 2.
Although not shown as another example, as a modification of the notch 2c, a concave groove 2c1 extending in a non-linear shape such as a curve is formed, or a mark 2e is provided only on either the outer surface 2b or the end surface of the elastic sleeve 2. It is also possible to arrange or change the number of the marks 2e to three or less or five or more in the circumferential direction.
By the way, in the case where the elastic sleeve 2 is particularly excellent in overall flexibility such as the rubber sleeve 21, when the diameter of the elastic sleeve 2 is reduced to a point where the notch 2c (concave groove 2c1) is filled when the diameter of the elastic sleeve 2 is reduced, the elastic sleeve 2 is further increased. Due to the reduced diameter deformation, the surplus portion outside the notch 2c (concave groove 2c1) bulges and deforms on the outer surface 2b of the elastic sleeve 2.
In order to prevent this, it is preferable to align the mark 2e of the elastic sleeve 2 between the peripheral end portions 3a of the plurality of divided holders 3 adjacent in the circumferential direction. As a result, even if the plurality of split holders 3 are moved closer to each other in the radial direction by the fastening member 4, the excess portion of the outside of the notch 2 c (concave groove 2 c 1) is between the peripheral end portions 3 a of the plurality of split holders 3. No bulging deformation.

It is preferable to provide a low friction portion 2d on the outer surface 2b of the elastic sleeve 2 (rubber sleeve 21) so that the contact area (friction resistance) with the inner surface (arc surface) 3b of the split holder 3 is reduced. Thereby, the elastic sleeve 2 (rubber sleeve 21) is smoothly reduced in diameter along with the close movement of the plurality of divided holders 3 by the tightening member 4, and the tightening torque of the tightening member (screw part) 4 can be reduced.
In the example shown in FIGS. 3 (a) to 3 (d), the protrusions and the grooves are alternately formed in a sawtooth shape in the cross section in the axial direction as the low friction portion 2d over a part or the whole of the rubber sleeve 21 in the axial direction. Has been.
Although not shown in the drawings as other examples, as a modified example of the low friction portion 2d, the protrusions and the grooves are formed in an uneven shape different from the sawtooth shape in cross section, or the inner side surface (arc surface) 3b of each divided holder 3 In addition, it is possible to form a low friction part, or to form a low friction part only on the inner surface (arc surface) 3b of the split holder 3 instead of the low friction part 2d of the outer surface 2b of the elastic sleeve 2.

In this second embodiment, as shown in FIGS. 4A to 4D, a modification of the joint body 10 is shown, in order to connect to another tube body as a connecting portion 11 on the proximal end side of the joint body 10. The configuration in which the nut portion 11b and the screw portion 11c are provided is different from the first embodiment shown in FIGS. 1 to 3, and other configurations are the same as those in the first embodiment shown in FIGS. .
In the example shown in FIGS. 4 (a) to 4 (d), an external thread is engraved on the outer peripheral surface of the base end side of the joint body 10 as the threaded portion 11c, and the pipe connection port of another pipe body or other equipment is used. It is configured to be screwed with an internal screw engraved on the inner peripheral surface.
Although not shown in the drawings as another example, as the screw portion 11c, an internal screw is engraved on the proximal inner peripheral surface of the joint body 10 and is engraved on the outer peripheral surface of the pipe connection port of another pipe body or other equipment. It is also possible to configure so as to be screwed with the provided external screw.
Therefore, the pipe joint A according to the second embodiment of the present invention can obtain the same effects as those of the first embodiment.

This embodiment 3 shows a modification of the elastic sleeve 2 as shown in FIGS. 5A to 5D, and a configuration using a resin sleeve 22 as the elastic sleeve 2 is shown in FIGS. Unlike the first embodiment and the second embodiment shown in FIGS. 4A to 4D, the other configurations are the same as the first embodiment shown in FIGS. 1 to 3 and FIGS. 4A to 4D. This is the same as Example 2 shown in FIG.
In the example shown in FIGS. 5A to 5D, a plurality of slits 2c2 that are arranged in a staggered manner in the axial direction and extend linearly as the notches 2c in the resin sleeve 22 are respectively provided in the circumferential direction. Notches are formed at intervals.
Although not shown as other examples, a plurality of slits 2c2 extending in the axial direction from one axial end of the resin sleeve 22 are formed in the circumferential direction, or the entire length of the resin sleeve 22 in the axial direction is formed. It is also possible to notch a single slit (slit) or to form a non-linear slit (slot) such as a curve.

Furthermore, it is preferable to provide a high friction portion 2f on the inner surface 2a of the resin sleeve 22 so that the frictional resistance with the outer surface B2 of the tubular body B is increased. Thereby, the pull-out strength of the tubular body B is improved.
In the example shown in FIGS. 5 (a) to 5 (d), the annular protrusions and the annular recesses are alternately uneven in the axial direction as the high friction part 2f over part or the whole of the inner surface 2a of the resin sleeve 22. Is formed.
Therefore, the pipe joint A according to the third embodiment of the present invention can provide the same effects as the first and second embodiments described above.

In the illustrated example of the previous embodiment, the first divided holder 31 and the second divided holder 32 that are divided into two in the circumferential direction are used as the plurality of divided holders 3. You may use the division | segmentation holder 3 divided | segmented or divided into four or more.

A pipe joint 1 nipple 1a outer peripheral surface 2 elastic sleeve 2b outer surface 2c excess portion 3 split holder 3a peripheral end 3b inner surface 3b1 inclined recess 3c end surface 3f through hole 3g screw hole 4 tightening member 4a head 4b shaft 4c screw 5 Stopper member 51 Spacer 5a Guide surface 5b Positioning means 5b1 Projection piece 5c Through-hole 5c1 Long hole 5d Sliding contact portion B Tube S Tube insertion space

Claims

A nipple provided along the insertion space of the tubular body;
An elastic sleeve deformable in the radial direction provided so as to surround the outer periphery of the insertion space of the tubular body formed along the outer peripheral surface of the nipple;
A plurality of split holders provided on the outside of the elastic sleeve so as to cover the outer surface of the elastic sleeve in the circumferential direction and be separable in the radial direction;
A clamping member that is provided across the plurality of divided holders and moves the plurality of divided holders closer to each other in the radial direction so that the elastic sleeve is deformed in a reduced diameter; and
A stopper member provided so as to face the outer surface of the elastic sleeve in the radial direction over the inner surface of the peripheral end portion of the plurality of divided holders adjacent in the circumferential direction;
The pipe member according to claim 1, wherein the stopper member has a guide surface that abuts in a radial direction on a surplus portion of the elastic sleeve that has undergone a diameter reduction deformation as the plurality of split holders approach each other by the fastening member.
The stopper member is a spacer provided so as to be immovable in the circumferential direction across the inner side surface of the peripheral end portion of the plurality of divided holders, and has the arcuate guide surface inside the spacer. The pipe joint according to claim 1.
The stopper member has a protruding piece parallel to an end surface of the peripheral end portion of the plurality of divided holders adjacent in the circumferential direction as positioning means for the stopper member with respect to the plurality of divided holders, 3. The pipe joint according to claim 1, wherein the end face of the peripheral end portion and the protruding piece are in contact with each other at the end of the approaching movement of the plurality of divided holders.
The fastening member includes a head portion, a shaft portion that is inserted through one of the circumferential end portions of the plurality of divided holders adjacent to each other in the circumferential direction, a screw hole and a screw that are opened on the other side. 3. The pipe joint according to claim 1, further comprising: a screw portion that is joined, wherein a maximum outer diameter of the head portion and the screw portion is larger than a minimum inner diameter of the through hole.
The stopper member is a long hole formed in the radial direction as a penetrating portion of the fastening member, and a sliding contact portion that is slidably contacted with the inner side surface of the peripheral end portion of the plurality of divided holders in the circumferential direction; The inner surface of the peripheral end portion of the plurality of divided holders has an inclined concave portion that gradually becomes thinner toward a circumferential end edge that is in sliding contact with the sliding contact portion. The pipe joint according to 1 or 2.
After the stopper member is assembled, the inner diameter in the short direction of the elongated hole is made smaller than the maximum outer diameter of the screw portion of the tightening member and larger than the outer diameter of the shaft portion. Item 6. The pipe joint according to Item 5.