JP4222788B2 - Fitting for flexible tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flexible tube joint, and more particularly to an improvement of a flexible tube joint used for gas piping and the like.
[0002]
[Prior art]
As this type of flexible tube, one having the structure shown in FIG. 7 is known.
[0003]
In FIG. 7, reference numeral 1 denotes a flexible tube, which is composed of a thin stainless corrugate tube 2 and a resin tube-like covering 3 covering the outer periphery of the corrugate tube 2. In this corgate pipe 2, 4 is a peak and 5 is a valley.
[0004]
The flexible tube 1 is usually connected to a flexible tube joint 10 as shown in FIG. 8 with the covering 3 removed for several piles at the tip of the corrugate tube 2.
[0005]
The flexible tube joint 10 includes a cylindrical body 11 and a push ring 12 whose tip is screwed into the cylindrical body. The flexible tube 1 has a corrugate tube 2 extending from the end of the push ring 12. The inner surface of the pusher wheel 12 can be inserted into the inside of the pusher wheel 12 and the cylindrical body 11, and a tapered surface 13 whose diameter increases toward the tip end side of the pusher wheel 12 is formed. An annular retainer 14 is disposed on the peripheral side, and the retainer 14 has an outer peripheral surface 15 that can come into contact with the tapered surface 13 and a protruding portion 16 that protrudes inward in the radial direction. When the flexible tube 1 is inserted, the protrusion 16 is expanded by the ridge 4 on the outer periphery of the corrugate tube 2 when the axial notches formed from 16 are provided at a plurality of positions in the circumferential direction. Possibly By allowing the peak portion 4 to pass and allowing the peak portion 4 to pass, the protrusion 16 can be deformed so as to engage with the valley portion 5 on the outer periphery of the corrugate tube 2. Are provided with seal rubber portions 17 and 18 for sealing in contact with the outer periphery of the ridge portion 4 of the corrugate tube 2. Further, a rubber ring 9 seals between the inner surface of the push ring 12 and the outer surface of the coated tube 3.
[0006]
In addition, 11a in a figure shows the inner cylinder part extended in the inner surface direction of the corrugate pipe | tube 2 from the back end of the coupling main body 11, and may not be provided depending on a coupling. When the inner cylinder portion 11a is present, the corrugate tube 2 is inserted between the outer surface of the inner cylinder portion 11a and the inner surface of the cylindrical body 11.
[0007]
In such a flexible tube joint 10, the operation of inserting the flexible tube 1 into the inside of the joint 10 does not require any other operations such as screwing of members, and the flexible tube 1 and the joint 10 can be connected to each other. They are surely joined together.
[0008]
[Problems to be solved by the invention]
By the way, in order to make sure that the above-mentioned flexible tube joint 10 exhibits the pull-out prevention effect, the tube-shaped covering 3 of the flexible tube 1 is removed by a necessary length to expose the corgate tube 2, and more reliably the flexible tube Although it is necessary to insert the flexible tube 1 to the back of the joint 10, the insertion resistance suddenly increases when the tip of the corrugate tube 2 approaches the seal rubber parts 17 and 18 at the innermost part of the joint. As shown in the figure, it was misunderstood that the tip of the corrugated pipe reached the innermost end of the joint, and there was a possibility of causing poor connection without further insertion.
[0009]
Even if there is a connection failure in this way, the appearance of the flexible tube 1 extending from the joint 10 to the outside is merely the appearance of the coated tube 3, so it is not different from the case of normal connection, and cannot be determined only by appearance observation. .
[0010]
For this reason, in order to determine whether or not the tube has been inserted normally, prior to the tube connection work, a mark 19 is provided at a position corresponding to the insertion depth from the cut end of the covering 3 after exposing the corrugated tube 2 having a necessary length. It is made possible to easily determine whether or not the insertion is appropriate by observing whether or not the mark is hidden in the press wheel 12, but such a mark 19 is attached every time the pipe is connected. This is troublesome, and if there is a forgotten mark 19 or the like, it may be misunderstood that it cannot be seen.
[0011]
An object of the present invention is to solve the above-mentioned problems and to develop a joint for a flexible tube that can reliably determine whether a pipe is connected or not without attaching a mark or the like when inserting a push ring. Is.
[0012]
[Means for Solving the Problems]
In order to achieve this object, the present invention is a joint for a flexible tube composed of a corrugate tube, a tubular body, a push ring whose tip is inserted into the tubular body, and a tubular body A ring-shaped sealing material disposed on the inner side of the push ring inside the inner ring, and a ring-shaped member disposed on the inner periphery of the cylindrical body on the inner side of the sealing material, the inner surface of the inner surface in the radial direction A ring-shaped member having a tapered surface that expands in diameter, and a tapered surface that can come into contact with the tapered surface of the ring-shaped member, and can be reduced in diameter by a notch formed in the axial direction from the back end surface. And a ring-shaped holder biased in the direction of diameter reduction, and when the corrugate tube is properly inserted to the far end of the cylindrical body, the holder snaps to the trough at the tip of the corrugate tube. It is intended to be engaged.
[0014]
With such a configuration, when the corrugate tube is inserted from the press ring into the cylindrical body, it is not completely joined unless it is inserted until a snap is felt, and this snap is clearly defined. Therefore, it can be inserted and confirmed without any markings.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the joint for flexible tubes which is embodiment of this invention is demonstrated in detail based on FIG. 1 and FIG.
[0016]
In the flexible tube joint 20 according to the embodiment of the present invention, a cylindrical body 21 and a push ring 22 whose tip is inserted into the cylindrical body 21 are attached by screws 22a. The rear end surface of the push wheel 22 is a surface that is perpendicular to the axis so as to be in uniform contact with the annular sealing material 23 disposed on the far side. The annular seal member 23 is formed of a rubber-like material having elasticity, and as shown in FIG. 3, the end surface is provided with concave grooves 24... 24 in the radial direction. In addition, when gas leaks from the corrugate pipe 2, the gas filled between the corrugate pipe 2 and the covering tube 3 covering the outer periphery escapes from the concave groove 24, and travels outside the packing 22b through the screw portion 22a. It is supposed to escape.
[0017]
A pressing ring 26 having a taper surface 25 whose rear end surface is radially expanded in the radial direction is disposed behind the annular seal member 23.
As shown in the partially enlarged view, the presser ring 26 is formed with a flange portion 26a having a slightly enlarged diameter on the outer periphery of the joint opening side end, and this flange portion 26a is formed on the inner surface of the tubular body 21 of the joint. By being engaged with the engaging step portion 21b, it is positioned so as not to move further back.
[0018]
A ring-shaped holder 27 urged in the diameter reducing direction is disposed on the back side of the pressing ring 26.
As shown in FIGS. 2 and 4, the ring-shaped holder 27 is formed by arranging blocks 29... 29 having irregular cross-sections in an intermittent state in the circumferential direction on the end surface of the ring body 28 having a small cross-sectional area. The blocks 29... 29 can be elastically rotated as indicated by arrows with the ring 28 as an axis. And the surface which faces the taper surface 25 of block 29 ... 29 is made into the same taper surface 29a. And the spring 31 for diameter reduction is externally fitted by the fitting groove 30 formed in the outer periphery of the block 29 ... 29, and the protrusion part 32 which protrudes to an internal diameter direction is a trough part of the corrugate pipe | tube 2, as shown in FIG. 5 is fitted.
[0019]
Further, the protruding portion 32 is a tapered surface 33 whose inner diameter is gradually reduced from the joint opening direction toward the back, and the back side is a standing surface 34, and this portion is an engaging portion. .
[0020]
A fireproof packing 35 made of a polymer material in which expanded graphite is kneaded is disposed at the back of the ring-shaped holder 27.
21a in the figure indicates an inner cylinder portion, which is provided as necessary. Next, the function of this flexible tube joint 20 will be described.
[0021]
First, the covering 3 on the outer periphery of the flexible tube 1 is removed, and the flexible tube 1 having the corrugated tube 2 exposed as many as necessary is inserted from the opening side of the pusher wheel 22 of the joint 20 as shown in FIG.
[0022]
As shown in FIG. 5, the corrugate tube 2 is pushed into the inner side of the cylindrical body 21 while expanding the annular seal member 23, and the annular seal member 23 has the flange 26a engaged with the engaging step portion 21b. It is supported by the pressing ring 26 engaged with the inner ring, and movement to the back is prevented.
[0023]
Further, in the corrugate tube 2 inserted beyond the holding ring 26, the first peak portion 4 comes into contact with the tapered surface 33 of the ring-shaped holder 27, and gradually blocks 29 ... 29 of the ring-shaped holder 27 in the radial direction. I will spread it.
[0024]
And if the first peak part 4 passes the taper surface 33, the block 29 ... 29 of the ring-shaped holder 27 will be diameter-reduced toward the trough part 5 by the urging | biasing force of the spring 31, as shown in FIG.
[0025]
Since the back side of the block 29 is a cut surface 34, the cut surface 34 is engaged with the side surface of the mountain portion 4 when the corrugate tube 2 is moved out, and the blocks 29. The ring-shaped holder 27 moves toward the ring 26, and the diameter of the ring-shaped holder 27 is reduced by the contact between the tapered surface 29 a of the block 29 and the tapered surface 25 of the holding ring 26. As a result, the ring-shaped holder 27 is strongly fitted to the valley 5 of the corgate tube 2. 2 and unity.
[0026]
And, since the retaining ring 26 is prevented from coming off at the end face of the pusher wheel 22 via the annular sealing material 23, the coming-out is surely prevented.
As described above, according to the flexible tube joint of the present invention, when the tube is connected, when the flexible tube is inserted to the end, the flexible tube is properly formed by feeling a snap-like shock generated when passing through the ring-shaped holder 27. Whether or not it has been inserted can be determined, and furthermore, if it is pulled out, it can be confirmed by the fact that it can no longer be removed by the holder 27, so that it is possible to confirm the appropriateness of the connecting work without providing a mark or the like. .
[0027]
【The invention's effect】
In the present invention, as described above, since the engaging claw part that elastically engages the next valley part beyond the peak part of the corrugate tube tip is provided in the innermost part of the joint, Whether the flexible tube is properly inserted or not can be detected by snapping engagement shock, and the connection state can also be confirmed by pulling the flexible tube so that it can be pulled out of the joint. Thus, it is possible to confirm whether or not the connection has been made reliably without providing a mark or the like.
[Brief description of the drawings]
FIG. 1 is a half-sectional view of a flexible tube joint according to an embodiment of the present invention.
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is a perspective view of an annular sealing material.
FIG. 4 is a perspective view of a ring-shaped holder.
FIG. 5 is a half-cut sectional view showing a state in which a flexible tube is inserted into a joint.
FIG. 6 is a half-cut sectional view showing a state in which the flexible tube is properly inserted to the inside of the joint.
FIG. 7 is an explanatory sectional view of a flexible tube.
FIG. 8 is a cross-sectional view showing a state in which a flexible tube is connected to a conventional flexible tube joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible tube 2 Corrugate tube 20 Joint 21 for flexible tubes Cylindrical body 22 Push ring 23 Ring-shaped sealing material 24 Groove 25 Tapered surface 26 Ring-shaped member 27 Ring-shaped holder 28 Ring body 29 Block

Claims (1)

  It is a joint for a flexible tube composed of a corrugate tube, and is disposed on the inner side of the tubular body, a push ring whose tip is inserted into the tubular body, and a push ring inside the tubular body A ring-shaped sealing material, and a ring-shaped member disposed on the inner periphery of the cylindrical body on the back side of the sealing material, the ring-shaped member having a back-side end surface that is a tapered surface whose diameter is increased in the radial direction It has a taper surface that can come into contact with the taper surface of the member and the ring-shaped member, can be reduced in diameter by a notch formed in the axial direction from the back end surface, and is biased in the diameter reduction direction. A flexible tube joint that includes a ring-shaped holder, and when the corrugate tube is properly inserted to the far end of the cylindrical body, the holder snap-engages with a trough at the tip of the corgate tube .

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