JPH03249496A - Pipe joint - Google Patents

Abstract

PURPOSE:To prevent a hose from being twisted, by providing a first cylindrical member, a second cylindrical member, a sleeve, a cylindrical collet and a locking member, and by arranging the hose between the journal part of the second cylindrical member and the collet, being extended toward a small diameter bore part of the first cylindrical member so as to reduce the diameter of the collet. CONSTITUTION:A pipe joint 21 is composed of a joint body 22 or a first cylindrical member having a large diameter bore 22b, and a core member 24 or a second cylindrical member provided thereto with a journal part 24c having an axial hole 24b communicated with a small diameter bore 22a. A sleeve 26 having an inclined surface part 26 is provided in the large diameter bore 22b, and a collet 28 which can increase and decrease its diameter when it slides in the sleeve 26 is provided. A hose 31 is inserted between the journal part 24c of the core member 24 and the collet 28. When an internal pressure is effected in the pipe joint 21, the collet 28 decreases its diameter so as to fasten the hose 31. As a result, the hose can be fastened to the pipe joint by one step, thereby it is possible to remarkably enhance the working efficiency of piping.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is useful for fastening a pipe joint, for example, a hose 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 can be fastened in a one-touch manner without using tools, does not use connecting parts to connect to equipment, and does not cause twisting of the hose.

(Prior Art and Problems to be Solved by the Present Invention) In general, hoses used for flow paths for high-pressure fluids with a normal pressure of 30 kg/d or higher have a multilayer composite structure consisting of an inner pipe, a reinforcing layer, an outer jacket, etc. have. There are two types of hose joints: swaged type and non-swaged type.

An example of a conventional caulking type pipe joint is the one shown in FIG. 15. In FIG. 15, 1 is a pipe joint, and the pipe joint 1 has a core metal fitting 2 and a fastener 3 attached to the core metal fitting 2. When a hose 8 consisting of an inner pipe 5, a reinforcing layer 6, and an outer sheath 7 is fastened to the pipe fitting 1, the hose 8 is connected between the cylindrical core 2a of the core fitting 2 of the pipe fitting 1 and the fastening fitting 3. It is inserted and tightened using a tightening machine at a hose manufacturer's factory. For this reason, such a pipe joint 1 not only requires a special caulking machine to fasten the hose 8 to the pipe joint I, but also requires adjustment of the length of the hose 8 at the site of piping work. , there is a problem that specifications cannot be specified.

Further, as a non-crimped type, there is, for example, one shown in FIG. 16. In FIG. 16, reference numeral 11 denotes a so-called reusable fitting as a pipe joint, and the reusable fitting 11 has a cylindrical core fitting 12 and a flange portion 1 which is screwed into the thread 12bL on the outer periphery of the core portion 12a of the core fitting 12.
3a.

When fastening the hose 8 of composite structure to the rustable fitting 11, first attach the fastening fitting 13 to the hose 8 using a vise or the like, and then tighten the core part 12a of the core fitting 12 inside the hose 8 with a spanner or the like. Screw it in to complete the connection with the hose. However, this method requires a tightening tool such as a vise or a wrench when tightening, and also has the problem that it takes time to tighten, resulting in poor work efficiency.

Further, as one-touch pipe fittings, for example, as shown in FIG.
There are some proposals such as in Publication No.-4796. The one-touch fitting 15 shown in FIG. 17 includes a tubular fitting body 16, an O-ring 18 as a sealing member that circumscribes a single-layer tube 17 inserted into the fitting body 16, and a tube 17.
It has a chuck 19 that bites on the outside of the holder. and,
The fluid inside the tube 17 is sealed by an O-ring 18 that presses against the tube 17 from the outside. Therefore, when a hose with a composite structure is connected to these known one-touch fittings, the reinforcing layer of the hose is a layer with voids made of braided fibers, so the fluid inside the hose flows from the end of the hose into the reinforcing layer. This can cause problems such as blistering of the hose or leakage of fluid.

Further, the tube 17 is gripped by the chuck 19 at a tip portion having almost no length in the axial direction by a sharp claw-like portion 19a on the outside of the tube 17. For this reason, such a one-touch fitting 15 may damage the outer jacket of the hose,
There is a problem that this method causes problems such as disconnection of the hose, and cannot be used for hoses with composite structures. Furthermore, due to reasons such as the low pressure resistance of the tube itself and the fact that the one-touch fitting 15 is mainly designed for single-layer tubes with a normal pressure of 20 kg/ctfl or less, the normal pressure is 30 kg/ctfl or less.
) cg/c (cg/c).

Further, there is one proposed in Japanese Utility Model Publication No. 17193/1983. This is a structure in which a bulge located inside the tube and a claw located outside the tube compress and engage the tube due to the axial force of the sliding tube that slides due to internal pressure. However, since the retaining member has almost no axial length, the repeated impact pressure of the fluid is 30) cg.
/C1i or more, there is a problem in that repeated stress concentrates on the retaining portion, and problems such as tearing of the outer cover of the hose and disconnection of the hose are likely to occur.

In addition, when repairing only a part of the hose due to damage to the hose in equipment pressure piping, etc., first cut the repaired part, attach the hose fittings to the remaining two places by caulking, etc., and then remove each part. I needed to connect. However, in order to attach the fitting by caulking, etc., it is necessary to first remove the hose piping from the equipment, and after installing the fitting, it is necessary to reconnect the piping, which is very time-consuming. Ta. In addition, in the case of a new hose, when a hose longer than what can be manufactured is required, the length of the hose is limited for handling and maintenance reasons, so an intermediate connection joint is required. There is a problem with that.

Furthermore, conventionally, when connecting a hose to a device in high-pressure piping of the device, a hose assembly is used in which crimping fittings serving as pipe joints are crimped and fixed to both ends of the hose. At this time, in order to prevent the hose from being twisted, the hose assembly 130 is fitted with a crimping fitting 131 on at least one end and a crimping fitting 132 with a union nut on the other end, as shown in FIG. 18(a). Use what you have. First, the crimping fitting 131 is screwed into connection with the device A while rotating the hose assembly 130, and then the union nut 133 of the crimping fitting 132 at the other end is connected to the adapter 134 that has been connected to the device B in advance. . Or Figure 18(b)
As shown in FIG. 1, the hose assembly 130A is connected to devices A and B using crimping fittings 131 with male threads at both ends and an adapter 135 with a union nut as a connection adapter. In either case, extra metal fittings such as a union nut and an adapter are required in addition to the hose assembly. Furthermore, when tightening the union nut 133, as shown in FIG. 18(C), fix the fixing nut 132A of the crimping fitting 132 with the union nut with a spanner or the like to prevent the hose from twisting due to joint tension. However, there is also the problem that the union nut 133 must be rotated and tightened, which takes time and effort.

Therefore, the present invention provides a second cylindrical member having a flange portion that slides on the inner wall of the large diameter hole of the first cylindrical member and a shaft portion having a shaft hole, and a second cylindrical member that is inclined inside the large diameter hole of the first cylindrical member. By providing a sleeve having a surface portion and a collet that reduces the diameter of the hose inserted between the shaft portion and the collet by contacting the inclined surface portion and approaching the sleeve in the axial direction, the collet reduces the diameter of the hose inserted between the shaft portion and the collet. The purpose is to allow a hose with a composite structure used for high-pressure fluid to be fastened to a pipe joint with a single action of inserting the hose into the pipe joint without using crimping equipment or jigs. Also,
As mentioned above, the hoses can be easily connected with one touch by simply inserting the hoses into the pipe joint. In addition, when connecting the hose to equipment and piping, it can be connected without twisting the hose, and even if the hose is connected to a moving part of equipment and the hose becomes twisted, the hose can rotate freely under pressurized load. The purpose of the present invention is to provide a pipe joint that can eliminate twisting.

(Means for Solving the Problems) A pipe joint according to the first invention of the present application includes 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; a second cylindrical member that is slidable in the axial direction within the large diameter hole of the cylindrical member and includes a flange portion that is provided with a sealing member; and a shaft portion that is connected to the flange portion and has an axial hole that communicates with the small diameter hole; a sleeve having an inclined surface part provided in the diameter hole part and inclined so that the diameter of the inner peripheral surface decreases in the axial direction; and an outer peripheral surface capable of contacting the inclined surface part of the sleeve in the large diameter hole part; a cylindrical collet whose diameter can be expanded and contracted when sliding in the axial direction; and a locking member that allows the sleeve and the collet to be located within the large diameter hole at the open end portion of the large diameter hole; A hose is inserted between the shaft portion and the collet from the large diameter hole side to the small diameter hole side of the cylindrical member, and the second cylindrical member is moved in the axial direction by the internal pressure of the fluid, so that the sleeve and collet are connected. The feature is that the collet contracts in diameter when approached and tightens the hose.

Further, the pipe joint according to the second invention of the present application includes a first cylindrical member having a small diameter hole and a large diameter hole continuous to the small diameter hole and having a diameter O larger than the small diameter hole, and a first cylindrical member having a large diameter O. a second cylindrical member having a flange portion that is slidable in the axial direction within the diameter hole portion and has a sealing member; and a shaft portion that is continuous with the flange portion and has an axial hole that communicates with the IJ diameter hole portion; and the large diameter hole. a sleeve having an inclined surface section provided within the sleeve and inclined so that a small diameter of the inner peripheral surface decreases in the axial direction; A cylindrical collet whose diameter can be expanded and contracted when sliding in the axial direction, and a locking can material that allows the sleeve and collet to be located within the large diameter hole at the open end of the large diameter hole. a sliding member interposed between the stop member and either the sleeve or the collet to enable the sleeve and the collet to rotate;
A hose is inserted between the shaft portion and the collet from the large diameter hole side to the small diameter hole side of the first yellow member, and the second cylindrical member is moved in the axial direction by the internal pressure of N & extension, and the sleeve and The feature is that the diameter of the collet contracts when it approaches the collet, tightening the hose.

Here, it is preferable to provide a sealing member on the outer circumference of the shaft portion of the second cylindrical member in order to improve the close contact with the inner pipe of the hose.

In addition, the material of the collet may be metal such as steel or aluminum, synthetic resin such as polyacetal or nylon, or
Any material that has the strength to maintain its shape under the load of compressing and crimping the hose or under the load of internal pressure during use may be used. In order to ensure the diameter reduction effect, the collet is preferably provided with a slit in the axial direction, and more preferably, a slit is provided on the inner circumferential surface of the collet that comes into contact with the outer circumferential surface of the hose to improve the performance of fastening and holding the hose. Forms ring-shaped or screw-shaped grooves.

(Function) In the pipe joint according to the 1.2 invention, the end of the hose extends from the large diameter hole side to the small diameter hole side of the first cylindrical member.
The hose is inserted between the shaft portion and the collet until it comes into contact with the flange portion of the cylindrical member, and the hose and the pipe joint are engaged with each other.

Next, when internal pressure is applied, the flange portion of the second cylindrical member slides in the axial direction on the inner wall of the large diameter hole due to the internal pressure of the fluid. As the second cylindrical member moves, the collet moves closer to the sleeve while its outer peripheral surface is inscribed in the inclined surface portion of the slip. Since the sleeve and collet are engaged with the open end portion of the first cylindrical member by the locking member so as to be within the large diameter hole, the sleeve and collet approach each other in the axial direction. At this time, while the diameter of the collet is being reduced, the cylindrical inner periphery of the collet is wedged into the outer periphery of the hose, and the end of the hose and the pipe joint are firmly connected. That is, the connection between the hose and the pipe joint can be completed in one touch using the internal pressure of the fluid without using any caulking equipment, jigs, or the like.

Furthermore, in the state in which the hose and the pipe joint are engaged, the hose is inserted between the shaft portion of the second cylindrical member and the collet, and is only in pressure contact with the second cylindrical member. The cylindrical member is slidable with respect to the first cylindrical member by means of a sealing member, so that the hose is rotatable relative to the second cylindrical member, or rotatable together with the second cylindrical member relative to the first cylindrical member. be.

Therefore, it is possible to rotate the first cylindrical member of the pipe joint and thread the threaded portion of the first cylindrical member into the connection part of the equipment without twisting the hose while the hose and the pipe joint are engaged. be.

Furthermore, when internal pressure is applied, the hose and pipe fitting are connected as described above, but when the internal pressure is unloaded again, the outer diameter of the sleeve is smaller than the inner diameter of the large diameter hole of the first cylindrical member. ,
The hose is rotatable together with the sleeve relative to the first cylindrical member. For this reason, even after the hose and pipe joint are connected, if the internal pressure is left unloaded, the large diameter hole of the pipe joint will not twist the hose (also, there is no need to use adapters, union keys, etc.) Can be screwed into the connection.

Furthermore, in the pipe joint according to the second invention of the present application,
If a sliding member is interposed between either the sleeve or the collector and the locking member, when internal pressure is applied, the end of the hose and the pipe fitting will be firmly connected as described above. However, the ends of the second cylindrical member, the sleeve, the collet, and the hose, which are integral with each other, are pressed in the first cylindrical member in the direction in which the sleeve comes out outward due to the axial pressing force caused by the internal pressure. Since either the sleeve or the collet is rotatably engaged with the first cylindrical member via the sliding member and the locking member, the hose can freely rotate in the circumferential direction even when internal pressure is applied. This allows it to be used on moving parts of equipment without twisting the hose.

(Example) Hereinafter, an example of the first invention of the present application will be described based on the drawings.

1 to 4 are diagrams showing a first embodiment according to the first invention of the present application.

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 portion 22a having a small-diameter hole in the axial direction and a large-diameter hole portion 22b having a larger hole diameter than the small-diameter hole portion 22a. the first with
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. A sleeve 26 is provided within the large diameter hole 22b of the joint body 220 on the side of the opening 22c that is far from the small diameter hole 22a. The sleeve 26 has its outer peripheral surface 26a connected to the inner wall 22d of the large diameter hole 22b of the joint body 22.
It is fixed by a retaining ring 27 as a retaining member that is in contact with the stepped portion 22e and the circumferential groove 22f near the opening 22c. The inner circumferential surface of the sleeve 26 has an inclined surface portion 26 whose diameter decreases toward the axial opening 22c.
It has c. Reference numeral 28 denotes a collet, and the cylindrical collet 28 is made of steel and is connected to the large diameter hole 22 of the joint body 22.
It has a conical outer peripheral surface 28a that contacts the inclined surface portion 26c of the sleeve 26 within the sleeve 26b. The inner surface of the collet 28 is provided with a plurality of ring-shaped circumferential grooves 28b having concavities and convexities, and when the collet 28 slides in the axial direction within the sleeve 26, the diameter can be expanded or contracted. As shown in Fig. 3.4, the collet 28 is provided with a plurality of axial slots 9l-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. The diameter has been ensured. Reference numeral 29 denotes an O-ring, which is provided 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 an O-ring, and the O-ring 30 is the core member 24
It is provided on the outer periphery of the shaft portion 24c at a position facing the circumferential groove 28b of the collet 28, and is in close contact with the inner tube of the inserted hose to seal between the inner tube and the shaft portion 24C. ing.

When assembling such a pipe joint 21, the O-ring 29 is inserted into the outer circumferential groove of the flange portion 24a of the core member 24, and the core member 2
4. Insert the O-ring 30 into the outer periphery of the shaft portion 24c.

Then, the core member 24 is inserted from the opening 22c side of the joint body 22 until the flange portion 24a of the core member 24 contacts the small diameter hole 22a, and the collet 28 is further inserted until it contacts the flange portion 24a of the core member 24. . Thereafter, the sleeve 26 is inserted into the joint body 22 so as to come into contact with the outer peripheral surface of the collet 28, and is fixed by the stepped portion 22e and the retaining ring 27.

As shown in FIG. 2, the hose 31 has an inner diameter D3+ of 9.
It is a high pressure hose with a 5mm composite structure, and the material is 32 inner tubes.
is made of nylon resin, the reinforcing layer 33 is made of polyester fiber, and the outer skin 34 is made of polyurethane.

As shown in FIG. 2(a), the end 31a of the hose 31 extends from the large diameter hole 22b side of the joint body 22 to the small diameter hole 22a.
The core member 24 is inserted sideways between the shaft portion 24c and the collet 28 until it comes into contact with the flange portion 24a.

Next, when internal pressure is applied inside the pipe fitting 21, the small diameter hole 22
The internal pressure in a causes the core member 24 to move axially toward the sleeve 26, causing the collet 28 to move toward the core member 24.
When the collet 2 is engaged with the core member 24 and moves together with the core member 24, the collet 2
8, this outer peripheral surface 28a is inside the sleeve 26.
The diameter is reduced while sliding in the axial direction while contacting the inclined surface portion 26c. Then, the end portion 31a of the hose 31 is tightened by the collet 28 and the shaft portion 24C.

Next, the effect will be explained.

As shown in FIG. 2(a), the end 31a of the hose 31 is
The hose 31 is inserted between the shaft portion 24c and the collet 28 from the large-diameter hole 22b side of the joint body 22 toward the small-diameter hole 22a side until it abuts the flange portion 24a of the core member 24.
and the pipe joint 21 are secured. 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. The pipe joint 21 of the present invention has a joint main body 2
The sleeve 26 and the collet 2 are placed inside the large diameter hole 22b of the collet 2.
8, when internal pressure is applied to the pipe joint 21, the flange portion 24a of the core member 24 moves in the axial direction to approach the sleeve 26 due to the internal pressure inside the small diameter hole portion 22a, and the collet 28 moves. It engages with the core member 24 and moves together with the core member 24. The outer circumferential surface 28a of the collet 28 contacts the inclined surface portion 26c of the sleeve 26 and slides in the axial direction within the sleeve 26, as shown in FIG. 2(b). 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 circumferential surface of the outer skin 34 of the hose 31 with a wide circumferential surface. Then, the hose 31 moves toward the opening 22c while being sufficiently tightened, and the hose 31 and the pipe joint 21 are sufficiently tightened, so that the fluid within the hose 31 will not leak. Further, the sleeve 26 has an inclined surface portion 26
The diameter of the maximum diameter portion 26d of c is the flange portion 2 of the core member 24.
4a, the flange portion 24 is locked to the maximum diameter portion 26d at a predetermined internal pressure. For this reason,
The hose 31 is prevented from being excessively crimped by the collet 28 and the core member 24, and damage to the outer skin 34 and the like is prevented, and breakage of the reinforcing layer is also prevented.

The hose 31 is tightened only by the internal pressure within the small diameter hole 22a of the pipe joint 21, and is fastened to the pipe joint 21 in a one-touch 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 collet 28, and when the hose 31 and the pipe joint 21 are engaged, the hose 31 does not rotate relative to the core member 24 or the joint body 22. Since it is possible, the pipe fitting 21 is connected to the hose 3.
By rotating the joint body 22, the threaded portion 22g of the small diameter hole portion 22a can be screwed into the connecting portion of the device without twisting the joint body 22.

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 together with the sleeve 26 relative to the joint body 22, so the pipe fitting 21 does not twist the hose 31 ( It can be screwed into the connection part of the equipment.

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

FIG. 5 shows a second embodiment 41 of the pipe joint according to the first invention of the present application.
FIG. In FIG. 5, the same components as in the first embodiment are given the same reference numerals.

In the second embodiment, as shown in FIG. 5, a cylindrical body 42 is interposed between the flange 24a of the core member 24 and the collet 28 in the large diameter hole 22b of the joint body 22. . The hose 31 is crimped and tightened by the circumferential groove 28b of the collet 28 and the shaft portion 24C of the core member 24 at a portion 31d separated from the distal end 31c of the hose 31 by the length of the cylindrical body 42. Therefore, the tip of the hose 31 is not damaged by the collet 28, and compared to the case without a cylindrical body, it can be used at higher pressure and has a longer life.

Next, a third embodiment of the first invention of the present application will be described.

FIG. 6 is a third embodiment 45 of the pipe joint according to the first invention of the present application.
FIG.

In FIG. 6, the same components as in the first embodiment are given the same reference numerals.

In the third embodiment, as shown in FIG. 6, the sleeve 26 is in contact with the flange 24a of the core member 24 in the large diameter hole 22b of the joint body 22, and the collet 28 is closer to the opening 22c than the sleeve 26. This is the case when it is placed. The diameter of the inner peripheral surface 26b of the sleeve 26 is the axial opening 22.
It has an inclined surface portion 26c inclined in a direction opposite to that of the first embodiment so as to increase toward the c side. Further, the collet 28 has an outer peripheral surface 28 that contacts the inclined surface section 26c of the sleeve 26 with an opposite slope within the large diameter hole section 22b of the joint body 22.
a, and is fixed to the joint body 22 by the step portion 22e of the joint body 220 and the retaining ring 27.

The flange portion 24a moves axially to approach the collet 28 due to the internal pressure within the small diameter hole portion 22a, and the sleeve 26 engages with the flange portion 24a, causing the flange portion 2
Move with 4a. The end portion 31a of the hose 31 is crimped between the collet 28 and the shaft portion 24c by reducing the diameter of the collet 28, and is tightened to the pipe joint 45. As a result, the hose 31 is completely crimped without moving toward the opening 22c.

In addition, in the above-mentioned embodiment, the sleeve 26 was explained as being separate from the large diameter hole 22b of the joint body 22.
In the present invention, the sleeve 26 is not limited to these embodiments, and as in the fourth embodiment 55 of the pipe joint according to the present invention shown in FIG.
2c may be plastically deformed so that the large-diameter hole 22b has an inclined surface portion 56 integral with the large-diameter hole 22b such that the diameter D2□ decreases as the inner circumferential surface of the large-diameter hole 22b approaches the opening 22c. .

Further, the collet 28 has an outer circumferential surface 28a that is similar to the collet 2.
Although the present invention is not limited to this embodiment, the outer circumferential surface 28a contacts the inclined surface portion 26C of the sleeve 26 within the sleeve 26 and slides in the axial direction. If the diameter is reduced, Fig. 8(a) (
As shown in b), it may be a part of the outer peripheral surface of the conical collet 28, or as shown in FIGS. 8(C) and (d), it may have a curved outer peripheral surface 28a. Alternatively, as shown in FIG. 8(e), the outer circumferential surface 28a forming the end of the trapezoidal collet 28 may be used.

Next, a fifth embodiment of the first invention of the present application will be described.

9 to 11 are diagrams showing a fifth embodiment of the first invention of the present application, and the same components as in the first embodiment are given the same reference numerals. In the fifth embodiment, as shown in FIG. 9, the intermediate pipe joint 61 is configured so that each structure is symmetrical with respect to the center line C in the figure, and the left and right pipe joints 61A, 61g are They are connected by a central small diameter hole 22a. The right side of the center line C in Fig. 9 shows the hose 31 inserted and engaged with the pipe joint 61m, and Fig. 10 shows the hose 31 with internal pressure applied.
The end portion 31a and the pipe joint 618 are shown firmly connected. According to this intermediate pipe joint 61, when the hose is damaged, the damaged part can be cut out and reconnection via the intermediate pipe joint 61 can be easily performed. No need for a hexagonal part for hanging.

In order to connect the hose, it is only necessary to insert the hose 31 into this intermediate pipe joint from both sides, so that the hose can be connected quickly and easily, and the unit length during transportation can be shortened. 1st
FIG. 1 shows a case where a plurality of intermediate pipe joints 61 fixed to a support column 63 are used to connect a plurality of hoses 31 to both sides of the intermediate pipe joints 61.

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

12 to 14 are diagrams showing one embodiment of the present invention, and the same components as in FIG. 1 are given the same reference numerals.

In this example, as shown in Figure 12.13,
The pipe joint 71 has a thrust bearing 73 as a sliding member that is interposed between the sleeve 26 and the stop ring 27 and allows the sleeve 26 to rotate. This pipe joint 71
When internal pressure is applied, the end 31a of the hose 31 and the core member 24 close to the opening 22 due to the axial pressing force, as described above.
c side, and the sleeve 26 is pressed against the stop ring 27 side. However, since the pipe joint 71 of the present invention has a thrust bearing 73 between the sleeve 26 and the stop ring 27, the hose 31 and the pipe joint 71 Even when the pipe joint 71 is connected to a device and internal pressure is applied, the hose 31 is connected to the core member 24, as shown in FIG.
It is integrated with the collet 28 and the sleeve 26 and is freely rotatable in the circumferential direction with respect to the joint body 22. Therefore, the hose 31 does not twist even when internal pressure is applied.

Next, one type of hose and five types of pipe joint samples (three types of examples and two types of comparative examples) were created, and the effects of the present invention were confirmed and will be explained.

Sample 1 of the pipe joint is the same as the first embodiment (FIG. 1) described above, and the inner diameter of the large diameter hole of the joint body is 20 an, the length of the collet is 15 mm, and the number of slints is 12.

Sample 2 is the same as the first embodiment described above, but the collet is made of polyacetal. Sample 3 is equipped with a cylindrical body 42 having an axial length of 10 mm, which is the same as in the second embodiment. Sample 4 is the conventional 150 kg shown in Figure 15 above.
Sample 5, same as the caulking type pipe fitting for f/C111
is the same as the conventional one-touch type pipe joint shown in FIG. 17 described above.

The tests are pipe joint burst pressure tests A and B, repeated impact test A,
This was carried out in accordance with JIS B8362-1983. In burst pressure tests A and B, after inserting or tightening the hose into the pipe joint, the pressure of the fluid was gradually increased and the pressure at the time of burst was measured. The burst pressure test A was conducted on two new test hoses, and the burst pressure test B was conducted on the test hoses after the repeated impact test A was conducted. Repeated impact test A, B
are respectively 105kgf/Cl at fluid temperature ioo'c
Evaluation was made based on the number of times of failure when impact pressures of up to 11 and 140 kgf/ci were repeatedly applied. The test results are shown in the table below.

(Hereinafter, next summer's margin) The test results are as shown in the table above. Samples 1 to 3 (Example 1.2) were compared with Sample 4.5 (Comparative Example 1.2), and burst pressure test A and It shows significantly superior results in the high-pressure repeated impact tests A and B. Compared to Comparative Example 1 of Sample 4, Samples 1 to 3 showed excellent results in pressure resistance in burst pressure test B, and there was no occurrence of hose disconnection or oil leakage, showing excellent results.

(Effects) As explained above, according to the 1.2 invention of the present application, the second cylindrical member has a flange portion and a shaft portion that slide on the inner wall of the large diameter hole of the first cylindrical member; A sleeve having an inclined surface section inside a large diameter hole of a cylindrical member, and a collet that is inscribed in the inclined surface section and whose diameter decreases as it approaches the sleeve in the axial direction are provided, and the collet is inserted between the shaft section and the collet. The collet reduces the diameter of the end of the hose due to the internal pressure of the small diameter hole and inserts it into the hose, and the composite structure hose used for high-pressure fluid can be used for tightening equipment, jigs, etc. by simply inserting it into the pipe joint. It can be fastened with one touch without the need for piping, and the workability of piping can be significantly improved.

In addition, when the hose is inserted between the shaft of the second cylindrical member of the pipe joint and the collet and the hose and the pipe joint are engaged, the hose can rotate relative to the second cylindrical member or the first cylindrical member. Therefore, the pipe joint can be rotated and screwed into the connection part of the equipment without twisting the hose.

In addition, even after the hose and the pipe joint are connected by applying internal pressure, if the internal pressure is not applied again, the sleeve can rotate relative to the first cylindrical member, so the pipe joint can be connected without twisting the hose. You can rotate it and connect it to the connection part of the device.

Furthermore, according to the second invention of the present application, the sliding member is interposed between the sleeve and the locking member, and the sleeve is rotatably engaged with the first cylindrical member. Sometimes the hose can be rotated circumferentially, allowing it to be used on moving parts of equipment without twisting the hose.

[Brief explanation of drawings]

1 to 4 are diagrams showing a first embodiment of a pipe joint according to the first invention of the present application, in which FIG. 1 is a partial vertical cross-sectional view, and FIG.
a) is a partial cross-sectional view of the hose when inserted, Fig. 2(b)
3 is a front view of the collet, and FIG. 4 is a partial longitudinal sectional view of the collet when the hose is tightened. 5 to 7 are partial vertical sectional views showing second to fourth embodiments of the pipe joint according to the first invention of the present application, respectively. FIGS. 8(a) to 8(e) are views showing other embodiments of the collet of the pipe joint according to the present invention, FIG. 8(a) is an explanatory side view of the other, and FIG. 8(b) is a front explanatory view of FIG. 8(a), FIG. 8(c) is another side explanatory view, FIG. 8(d) is a front explanatory view of FIG. 8(C), and FIG. 8(e) is an explanatory front view of FIG. ) is yet another side explanatory view. 9 to 11 are diagrams showing a fifth embodiment of the first invention of the present application, FIG. 9 is a longitudinal cross-sectional view thereof, and FIG. 10 is a partial cross-sectional view showing its operation.
FIG. 11 is an explanatory diagram showing the installation state. 12th
Figures 1 to 14 are diagrams showing an embodiment of the second invention of the present application,
FIG. 12 is a longitudinal cross-sectional view showing its operation, FIG. 13 is an enlarged cross-sectional view of the main part thereof, and FIG. 14 is a front view showing the connection with equipment. 15 to 18 are views showing conventional pipe joints, respectively. FIG. 15 is a vertical sectional view thereof, FIG. 16(a) is a partially longitudinal sectional view, and FIG. Diagram (a)
FIG. 17 is a longitudinal sectional view when the hose is fastened, FIG. 17 is another longitudinal sectional view, and FIGS. 18(a) to 18(C) are front views showing the connections between the pipe joint and the equipment. 21.41.45.55.61.71... Pipe joint, 22... Joint body (first cylindrical member), 22a
...Small diameter hole portion, 22b...Large diameter hole portion, 24... Core member (second cylinder member), 24a...
...Flange portion, 26...Sleeve, 26a...Outer peripheral surface, 26c...Slanted surface portion, 27...Retaining ring (engaging member), 28...
... Collet, 28a ... Outer circumferential surface, 31 ... Hose. agent

Claims (2)

[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 such that the sleeve and the collet are located in the large diameter hole at an open end portion of the large diameter hole; A hose is inserted between the shaft portion and the collet, and the second cylindrical member is moved in the axial direction by the internal pressure of the fluid, and as the sleeve and the collet approach, the diameter of the collet is reduced and the hose is tightened. pipe fittings. (2) 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 in which the sleeve and the collet are located in the large-diameter hole at the open end portion of the large-diameter hole; and a locking member interposed between the locking member and either the sleeve or the collet to hold the sleeve and the collet. a sliding member that is rotatable; a hose is inserted between the shaft portion and the collet from the large-diameter hole side to the small-diameter hole side of the first cylindrical member; A pipe joint characterized in that by moving two cylindrical members in the axial direction and bringing the sleeve and collet closer together, the diameter of the collet is reduced to tighten the hose.