JPH0280889A - Tube fitting - Google Patents

Abstract

PURPOSE:To insert and pull a hose into and from a tube fitting simply by moving an open ring in the axial direction to the collet side, pressing one end portion of the ring to the collet end surface and pulling out the hose. CONSTITUTION:When a hose 31 is inserted between the shaft portion of the second cylinder member 24 of a tube coupling 21 and a collet 28, the collet 28 holds the hose 31. At the time of pulling out the hose 31, one end portion of an open ring 36 is pressed and the other end portion thereof is brought into contact with the end surface of the collet 28 to be kept from moving with the hose 31. When the hose 31 is pulled out against the hose holding force, the hose can be easily separated from the hose and pulled out as the collet is not reduced in diameter. When the internal pressure of a fluid is applied after the hose is inserted, the collet 28 engaged with a flange portion 24a and a sleeve 26 approach each other, the open ring 36 has an inclined surface, so that the collet 28 is reduced in diameter by the inclined surface portion of the sleeve 26 and further reduced in diameter enough by the inclined surface of the open ring so as to firmly connect the hose 31 and the tube fitting 21.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is useful for connecting pipe joints, for example, hoses having a composite structure such as an inner pipe, a reinforcing layer, and an outer jacket. The present invention relates to a pipe joint that allows easy adjustment of attachment and detachment between a bow and a pipe joint, that can be fastened in one-touch manner without using caulking equipment or jigs, and that does not cause twisting of the hose.

(Prior Art) Generally, a bose used for a high-pressure flow path with a normal pressure of 30 kg/cJ or more has a multilayer structure consisting of an inner tube, a reinforcing layer, an outer cover, and the like. The inventors of the present invention proposed a hose as shown in Japanese Patent Application No. 63-55389 as a hose that is connected to a pipe joint and used in a high-pressure flow path of equipment.

As shown in FIG. 12, the pipe joint 1 has a joint main body 2 consisting of a small diameter hole 2a and a large diameter hole 2b, and a flange 4a and a shaft 4b inside the joint main body 2. The opening end of the joint body 2 is arranged so that there is a core member 4 that can slide on the core member 4, a tubular sleeve 5 in the large diameter hole 2b, and a collet 6 that can contact the inclined surface 5a of the sleeve 5 and can expand and contract in diameter. It has a retaining ring 7 provided at. When connecting the hose 8 to this pipe joint 1 and connecting it to equipment, etc., the hose 8
is inserted between the shaft portion 4b and the collet 6 from the large diameter hole 2b side to the small diameter hole 2a side of the joint body 2, and the core member 4 moves in the axial direction due to the internal pressure of the fluid, and the sleeve 5 Each time the collet 6 and the collet 6 approach each other, the diameter of the collentro is reduced and the hose 8 is tightened.

When connecting the hose 8 to the pipe joint 1 and connecting it to equipment, etc., the hose 8 is fully inserted into the pipe joint 1 in advance, and assembled.
Check the hose piping and placement, including overall length and bends. Alternatively, the hose 8 is inserted after the pipe fitting 1 is attached to a device or the like in advance. Then, in the event of a malfunction, the bowse 8 is pulled out from the pipe joint 1 to adjust the length of the bowse 8.

Further, when piping a hose to a device, for example, in a factory, the hose is inserted into a pipe joint, temporary piping is performed, and after assembly and adjustment, the hose is pulled out from the pipe joint and disassembled. Then, it is packed and transported to the work site, and after assembling the pipe joint and the hose again, internal pressure is applied to fasten the hose and the pipe joint.

(Problem to be Solved by the Invention) However, when the hose 8 is inserted into the pipe joint when assembling these hoses and the pipe joint, the collet 6 is in a state where the hose 8 is lightly gripped.

Then, when a pulling force is applied to the hose 8, Collen].6 moves together with the hose 8 and approaches the sleeve 5, causing Collen[.
6 is reduced in diameter and further bites into the hose 8 to tighten the hose 8. For this reason, there is a problem that once the -degree hose 8 is inserted into the pipe joint, the hose 8 cannot be pulled out.

Therefore, in order to remove the hose 8 inserted into the joint 1, after removing the retaining ring 7 that is locked to the open end of the large diameter hole 2b of the joint body 2, the hose 8, sleeve 5 and The collet 6 or, if necessary, the core member 4 together must be extracted from the joint body 2. These removal operations require a lot of effort, and furthermore, the hose 8, sleeve 5, collet 6, or core member 4 must be reassembled into the large diameter hole of the first cylindrical member, which requires even more effort. There is a point.

Therefore, the pipe joint according to the present invention makes it possible to easily pull out the hose with one touch after inserting the hose into the pipe joint when connecting the hose to the pipe joint and connecting it to equipment, etc. , can be fastened with one touch without using any jigs, etc.
It is an object of the present invention to provide a pipe joint that does not cause twisting in the bowse and does not impair durability.

(Means for Solving the Problems) A pipe joint according to the present invention includes a first cylindrical member having a small-diameter hole and a large-diameter hole connected to the small-diameter hole and having a larger hole diameter than the small-diameter hole; a second cylindrical member having a flange portion that is slidable in the axial direction within the large diameter hole and has a sealing member; and a shaft portion that is connected to the flange portion and has a shaft hole that communicates with the small diameter hole; a sleeve having an inclined surface portion provided at the inner circumferential surface thereof such that the diameter of the inner circumferential surface thereof decreases in the axial direction;
a cylindrical collet having an outer peripheral surface capable of contacting the inclined surface of the sleeve within the large diameter hole and capable of expanding and contracting in diameter when sliding in the axial direction within the sleeve; A locking member is provided so that the sleeve and the collet 1 are located in the large diameter hole, and the locking member has one end on the inside of the sleeve that can come into contact with the end face of the collet on the open end side, and the other end that has the large diameter hole. a tubular open ring that protrudes axially outward from the open end portion of the hole and is movable in the axial direction; After inserting the hose between the collet and the collet, when pulling out the hose, move the release ring toward the collet in the axial direction so that one end of the release ring comes into contact with and presses the end surface of the collet, and at the same time, pull out the hose. It is characterized by Further, it is preferable to provide an inclined surface on the inner periphery near one end of the open ring, which is an extension of the inclined surface of the inclined surface portion of the sleeve. It is also preferred that the collet has at least one sharp protrusion protruding inwardly on the inner peripheral surface and having an inner diameter equal to or smaller than the outer diameter of the hose.

(Function) The pipe joint according to the present invention has a tubular open ring inside the sleeve, one end of which can come into contact with the end surface of the collet, the other end of which protrudes outward from the open end, and which is movable in the axial direction. Therefore, when the hose is inserted between the shaft of the second cylindrical part of the pipe joint and the collet, the collet grips the hose, but
When pulling out the hose from the pipe joint, press the other end of the release ring to move the release ring in the axial direction, and press the one end against the end face of the collet to prevent the collet from moving with the hose. At the same time, when the hose is pulled out against the gripping force that grips the hose, the collet does not contract in diameter, so the hose can be easily pulled away from the collet.

Further, when the internal pressure of the fluid is applied after inserting the hoss between the shaft portion of the second cylindrical member and the collet, the collet that engages with the flange portion and the sleeve approach each other, and the diameter of the collet is reduced. Since the release ring has an inclined surface, the diameter of the collet is reduced by the inclined surface portion of the sleeve, and the diameter of the collet is further reduced sufficiently by the inclined surface of the release ring. Therefore, the hose and pipe joint are tightened even more tightly.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 9 are diagrams showing a first embodiment according to the present invention.

First, the configuration will be explained. In FIG. 1, 21 is a pipe joint, and the pipe joint 21 is connected to a small diameter hole part 22a having a small diameter hole in the axial direction and a large diameter hole part 22b having a larger hole diameter than the small diameter hole part 22a. 1st to have
A joint body 22 as a cylindrical member, a flange portion 24a that slides in the axial direction within the large diameter hole 22b of the joint body 22, and a shaft portion that has a shaft hole 24b that is continuous with the flange portion 24a and communicates with the small diameter hole 22a. 24c as a second cylindrical member. An open end portion 22c within the large diameter hole 22b of the joint body 22 that is far from the small diameter hole 22a.
A sleeve 26 is provided on the side. The sleeve 26 has its outer circumferential surface 26a in contact with the inner wall 22d of the large diameter hole 22'b of the joint body 22, and has a stop ring 2 as a locking member that engages with the stepped portion 22e and the circumferential groove 22f inside the open end portion 22c.
7, and a sleeve 26 and a collet 28 to be described later.
A retaining ring 27 is used to ensure that the retaining ring 27 is located within the large diameter hole 22b.

The diameter of the inner circumferential surface of the sleeve 26 is the same as that of the axially open end portion 2.
It has an inclined surface portion 26c that is inclined so as to decrease toward the 2c side. 28 is a collet, which is a cylindrical collet 2.
8 is made of polyacetal and is a large diameter hole 2 of the joint body 22.
2b has an outer circumferential surface 28a that contacts the inclined surface portion 26c of the sleeve 26. The inner surface of this throat 28 is provided with a plurality of ring-shaped circumferential grooves 28b and one sharp edge 28e.
When sliding in the axial direction within 6, the diameter can be expanded or contracted. The inner diameter do11 of the edge 28e is 0.0 from the outer diameter of the hose described later.
It is smaller by 5 mm to 1 mm. It may be equal to the outside diameter of the hose. As shown in Fig. 3.4, the collet 28 is provided with a plurality of axial grooves 28c on its circumference, and can maintain its shape even under the load of compression and crimping of the hose, which will be described later. It is designed to ensure diameter reduction.

36 is a release ring, and the tubular release ring 36 is movable while sliding in the axial direction in contact with the inner peripheral surface of the sleeve 26. One end 36a of the release ring 36 is connected to the collet 2.
The other end 36b protrudes outward from the open end portion 22c of the large diameter hole 22b to form a flange shape. As shown in FIG. 5.6, a step 36c is provided on the outer periphery of the release ring 36, and the release ring 36 engages with a step 26d provided on the inner periphery of the sleeve 26 so that the release ring 36 is axially outward of the sleeve 26. This prevents it from slipping out. Also, sleeve 2
As shown in FIG. 6, a plurality of slits 36e are provided in the axial direction in the insertion portion 36d of the release ring 36 that is inserted inside the sleeve 26 and slides on the sleeve 26. When the open ring 36 is inserted into the sleeve 26 from the outside of the open end portion 22c, the ring 1-36e becomes narrower, and the insertion portion 36d reduces in diameter so that it can be inserted into the sleeve 26.

Further, an inclined surface 36f, which is an extension of the inclined surface of the inclined surface portion 26c of the sleeve 26, is provided on the inner periphery of the open ring 36 near one end 36a. This is done by inserting the hose 31 between the collet 28 and the shaft portion 24c, and
28 and the sleeve 26, the outer peripheral surface 28a of the collet 28 can move along the inclined surface portion 26c and the inclined surface 36f of the sleeve 26.

As another example of the open ring 36, as shown in the seventh example, the other end 36b of the open ring 38 may remain tubular. That is, it is also possible to form an open ring 38 without having a flange shape, and in which the insertion portion 36d does not have the grooves 36e.

Reference numeral 29 denotes an O-ring, and the O-ring 29 is provided in a circumferential groove on the outer periphery of the flange portion 24a of the core member 24, and seals the joint body 22 and the flange portion 24a of the core member 24.

30 is a ○ ring, and the ○ ring 30 is provided in a circumferential groove at a position facing the circumferential groove 28b of the collet 28 on the outer circumference of the shaft portion 24c of the core member 24, and is in close contact with the inner tube of the inserted bose. This seals the space between the inner tube and the shaft portion 24c.

When assembling such a pipe joint 21, an O ring 29 is inserted into a circumferential groove on the outer periphery of the flange portion 24a of the core member 24, and an O ring 30 is inserted into a circumferential groove on the outer periphery of the shaft portion 24c of the core member 24. Then, the core member 24 is inserted from the open end portion 22c side of the joint body 22 until the flange portion 24a of the core portion vi'24 comes into contact with the small diameter hole portion 22a, and then the collet 2
8 is inserted until it contacts the flange portion 24a of the core member 24. Thereafter, the sleeve 26 is inserted inside the joint body 22 so as to contact the outer circumferential surface of the collet 28, and the step portion 22 is
e and fixing ring 27.

Then, the slit 36e of the insertion portion 36d of the release ring 36 is narrowed inside the sleeve 26 to reduce the diameter of the sleeve 26.
6, and the step 36c of the release ring 36 and the step 26d of the sleeve 26 are engaged. In the release ring 38 shown in FIG. 7, the release ring 38 is assembled with the sleeve 26 in advance and inserted together with the sleeve 26 into the large diameter hole 22b.

As shown in FIG. 2, the hose 31 has an inner diameter d31 of 9.
It is a high pressure hose with a 5mm composite structure, and the material is 32 inner tubes.
is a nylon resin, and the reinforcing layer 33 is a polyester fiber.
The knitted construction, jacket 34, is polyurethane.

As shown in FIG. 2, the end 31a of the hose 31 has a flange formed between the shaft 24c of the core member 24 and the collet 28 from the large diameter hole 22b side to the small diameter hole 22a side of the joint body 22. It is inserted until it comes into contact with the portion 24a. colette 2
The inner diameter dze of the edge 28e of 8 is the outer diameter D of the hose 31.
31, the edge 28e of the collet 28 can bite into the outer periphery of the jacket 34 and grip it. hose 31
When pulling out the collet from the pipe joint 21, first move the release ring 36 toward the collet 28 in the axial direction, bring one end 36a of the release ring 36 into contact with the end surface 28d of the collet 28, and release the end surface 28.
d and pull out the hose 31.

Next, the effect will be explained.

As shown in FIG. 2, the end 31a of the hose 31 moves from the large diameter hole 22b of the joint body 22 toward the small diameter hole 22a until it abuts the flange 24a of the core member 24.
c and the collet 28. An end portion 31a of the hose 31 engages with the collet 28 and the shaft portion 24c. In particular, since the inner diameter d2 of this edge 28e of the collet 28 is smaller than the outer diameter D3+ of the hose 31, this sharp edge 28e bites into the outer sheath 34 of the hose 31 and sufficiently grips the hose 31. Therefore, when the internal pressure of the fluid is applied and the fluid pressure acts on the flange portion 24a when the hose 31 is fastened, and the flange portion 24a moves in the axial direction, the hose 31 is Koren 1-28
This prevents the hose from coming out without being fully engaged. That is, the collet 28 is fully engaged with the hose 31 by biting into it.

Therefore, after inserting the end 31a of the hose 31 between the shaft 24c and the collet 28, before the internal pressure of the fluid is applied, when the hose is pulled out again from between the shaft 24c and the collet t48, In order to prevent the collet 28 from moving with the bows being pulled out and contracting in diameter due to the sleeve 26, first, as shown in FIG. 5.8, the open end portion 2 is
2c, the other end 36b of the release ring 36 protruding outward is pressed to move it in the axial direction toward the collar throat 28, and one end 36a of the release ring 36 is brought into contact with the end surface 28d of the collar I 28 and pressed. By preventing the collet 28 from moving in the axial direction and pulling it out against the engagement between the hose 31 and the collet 28, only the hose 31 can be pulled out smoothly.

In addition, when tightening the end 31a of the hose 31 to the pipe joint 21, the end 31a of the hose 31 is attached to the shaft of the core member 24.
When the hose 31 is inserted between the collet 4c and the collet 28 until it contacts the flange 24a, the collet 28's end 28e will bite into the outer sheath 34 of the hose 31, even if the outer sheath 34 is contaminated with dirt, oil, etc. The boss 31 is fully secured to the collet 28.

The inner surface 31b of the hose 31 contacts and seals the O-ring 30 on the shaft portion 24c, and there is no fluid leakage even when the internal pressure inside the pipe joint 21 is under no pressure or extremely low pressure. In addition, since the pipe joint 21 has a sleeve 26 and a collet 28 in the large diameter hole 22b of the joint body 22,
When internal pressure is applied to the pipe fitting 21, the internal pressure inside the small diameter hole 22a causes the flange portion 24a of the core member 24 to press against the sleeve 26.
collet 2 while moving in the axial direction to approach collet 2.
8 engages with the core member 24 and moves together with the core member 24. As shown in FIG. 9, the outer circumferential surface 28a of the collet 28 comes into contact with the inclined surface 26c of the sleeve 26 and the inclined surface 36f of the release ring 36 located on the extension thereof, so that the outer peripheral surface 28a of the collet 28 comes into contact with the inclined surface 26c of the sleeve 26 and the inclined surface 36f of the release ring 36 located on the extension thereof. Slide in the axial direction. At this time, the gap between the slits 28c of the collet 28 becomes smaller and the diameter of the collet 28 is reduced, and the plurality of uneven circumferential grooves 28b of the collet 28 bite into the outer periphery of the jacket 34 of the hose 31 with a wide circumferential surface. Then, the hose 31 moves toward the open end 22c while being sufficiently crimped, the hose 31 and the pipe joint 21 are sufficiently tightened, and the fluid within the hose 31 does not leak. Further, the sleeve 26 has an inclined surface portion 26
The diameter of the maximum diameter portion 26f of C is the flange portion 2 of the core member 24.
Since it is smaller than the outer diameter of 4a, it is locked to the maximum diameter portion 26f at a predetermined internal pressure. Therefore, the hose 31 is not excessively tightened by the collet 28 and the core member 24, and damage to the outer sheath 34 and the like is prevented, and breakage of the reinforcing layer is also prevented. The boss 31 is tightened only by the internal pressure within the small diameter hole 22a of the pipe joint 21, and is tightened to the pipe joint 21 in a one-button manner. Therefore, the tightening work can be performed extremely easily without requiring any tightening equipment or jigs.

In addition, when connecting the pipe joint 21 to high-pressure equipment, the hose 3
1 is inserted between the shaft portion 24c of the core member 24 and the columns 1 to 28, and when the hose 31 and the pipe fitting 21 are engaged, the boss 31 is inserted into the core member 24 or the fitting body 22. On the other hand, since the pipe joint 21 is rotatable, the pipe joint 21 can be screwed into a connection part of a device by rotating the joint body 22 without twisting the hose 31.

Furthermore, even after the hose 31 and the pipe fitting 21 are connected, if the internal pressure is left unloaded, the hose 31 can rotate with the sleeve 26 relative to the joint body 22, so the pipe fitting 21 can rotate without twisting the hose 31. , can be screwed into the connection part of the equipment.

Next, a second embodiment of the present invention will be described.

FIG. 10 is a diagram showing a second embodiment 41 of the pipe joint according to the present invention. In FIG. 10, the same components as in the first embodiment are given the same reference numerals.

In the second embodiment, as shown in FIG. 10, one end 46a of the release ring 46 is formed into a flange shape, and is engaged with the step 26d of the sleeve 26. Further, it does not have a slope corresponding to the inclined surface 36f of the release ring 36 of the first embodiment. Everything other than the above is the same as the first embodiment.

In addition, in the first embodiment, as shown in FIG. A spring 48 may be interposed to bias it. Since the release ring 36 is urged outward by the spring 48, the hose pull can only be pulled out when the release ring 36 is strongly pressed inward in the axial direction.
Since the release ring 36 normally returns to its initial position, there is no danger of accidentally pulling out the hose, resulting in high safety. Further, the sloped surface 36f of the release ring 36 is on an extension of the sloped surface portion 26c of the sleeve 26, so that the pose 31 can be sufficiently tightened.

(Effects) As explained above, according to the present invention, when connecting a hose to a pipe joint and connecting it to equipment, it is possible to easily pull out the hose after inserting it into the pipe joint with a single touch, and , it can be fastened with one touch without using crimping equipment, jigs, etc., and the hose will not be twisted and its durability will not be impaired.

[Brief explanation of the drawing]

1 to 9 are diagrams showing a first embodiment according to the present invention,
Fig. 1 is a longitudinal sectional view of the collet, Fig. 2 is a longitudinal sectional view of the hose when inserted, Fig. 3 is a front view of the collet, Fig. 4 is a partial sectional view of the collet, and Fig. 5 is a longitudinal sectional view of the collet. 6 is a partially cutaway perspective view of the release ring, FIG. 7 is a partially cutaway perspective view of another embodiment of the release ring, and FIG. 8 is a longitudinal section showing its function. 9 are other longitudinal sectional views showing the effect. FIG. 10 is a longitudinal sectional view showing a second embodiment of the pipe joint according to the present invention. FIG. 11 is a sectional view of a main part showing another attachment state of the release ring of the pipe joint shown in FIG. 1. FIG. 12 is a longitudinal sectional view showing a conventional pipe joint. 21.41...Pipe joint, 22...Joint body (first cylindrical member), 24...
... core member (second cylinder member), 26 ... sleeve, 27 ... retaining ring (locking member), 28 ...
...collet, 29...○ ring, 30...○ ring, 31... hose, 36.46... release ring. Agent: Patent Attorney Arigunbu

Claims (3)

[Claims] (1) A first cylindrical member having a small-diameter hole and a large-diameter hole that is connected to the small-diameter hole and has a larger hole diameter than the small-diameter hole, and a sealing member that is slidable in the axial direction within the large-diameter hole of the first cylindrical member. a second cylindrical member comprising a flange portion having a flange portion and a shaft portion having a shaft hole connected to the flange portion and communicating with the small diameter hole portion; and a second cylindrical member provided within the large diameter hole portion and having an inner circumferential surface whose diameter decreases in the axial direction. a cylindrical collet having an outer circumferential surface capable of contacting the inclined surface portion of the sleeve within the large diameter hole, and whose diameter can be expanded and contracted when sliding in the axial direction within the sleeve; a locking member provided at the open end portion of the large diameter hole so that the sleeve and the collet are located within the large diameter hole; and one end portion inside the sleeve capable of abutting against the end surface of the collet on the open end portion side. a tubular open ring whose other end protrudes axially outward from the open end portion of the large-diameter hole and is movable in the axial direction, the opening ring extending from the large-diameter hole side of the first cylindrical member to the small-diameter hole. After inserting the hose between the shaft section and the collet toward the front side, when pulling out the hose, move the release ring toward the collet in the axial direction and press one end of the release ring into contact with the end surface of the collet. A pipe joint that is characterized by the ability to pull out the hose at the same time. (2) The pipe joint according to claim 1, wherein an inclined surface is provided on the inner periphery near one end of the open ring, the inclined surface being an extension of the inclined surface of the inclined surface portion of the sleeve. (3) The pipe fitting according to claim 1 or 2, wherein the collet has at least one sharp edge projecting inwardly on the inner peripheral surface and having an inner diameter equal to or smaller than the outer diameter of the hose.