JP2005325935A - Terminal structure of flexible metal hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily manufacturable terminal structure of a flexible metal hose capable of being supplied comparatively inexpensively and holding leakage stop effect for a long time. <P>SOLUTION: This terminal structure of the flexible metal hose is provided with a first part 3 allowing a corrugated metal tube 1 provided with a soft ring 2 made of rubber or plastic to be inserted and a second part 7 assembling its end part on an end part of the first part 3 by surrounding an end part of the metal tube 1 in which a pressing ring 6 is fitted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a terminal structure of a flexible metal hose, and more specifically, to prevent leakage of a flexible metal hose composed of a wave-processed metal tube that feeds pressure fluid such as water, oil, gas, air, and steam. The present invention relates to a terminal structure having a simple configuration.

  In general, a flexible metal hose is usually made of a stainless steel metal tube with a uniform wave formed on the metal tube. When the fluid to be fed is at a very high pressure, a braid consisting of many wires braided on the metal tube. However, the object of the present invention is a type that does not cover this blade.

  Joint means for connecting to other pipes are installed at both ends of the metal tube. The terminal structure of the conventional flexible metal hose for installing the joint means can be roughly classified into a weld type and a non-weld type.

  The hose terminal structure shown in FIGS. 3 and 4 is a welding type. In the example shown in FIG. 3, a joint 53 fitted into a loose flange 54 is fitted to the end of the metal tube 51. In this case, the long-formed metal tube 51 with the blade 52 is cut to a desired length and welded from the cut end of the metal tube 51 to the blade 52 and the joint 53 (welded portion 55).

  The hose terminal structure shown in FIG. 4 has a blade retainer 56 fitted to the end of a tube 51 with a blade 52 sheathed, and a sleeve 58 with a slide nut 57 engaged with the end surface of the metal tube 51. It is. In this case, first, the separated end portion of the metal tube 51 cut to a desired length, the blade 52 and the blade retainer 56 are welded (welded portion 59), and then the sleeve 58 is welded to the welded portion 59 (see FIG. Weld 60).

  In the case of these welding methods, the metal tube 51 is manually welded in an annular shape along the cut end. However, since the welded portion is heated, the surface of the metal tube 51 is easily oxidized and oxidized. As a result, the corrosion resistance is reduced.

  In addition, the flexibility of the metal tube is given by the change in the radius of curvature of the corrugation, but when the influence of heating is large, the metal structure near the welded joint of the metal tube changes and the change in the radius of curvature, that is, The bending resistance is significantly reduced. In particular, in the case of the hose terminal structure shown in FIG. 4, the effect of heating is greatly affected because the welding operation must be performed twice.

On the other hand, the non-welding type hose terminal structure not based on welding is to fix the ends of the metal tube 51 and the blade 52 to a nut or the like by a method such as caulking or clamping.
FIG. 5 shows a structure in which a fixing pipe 61 is fixed by caulking and a connecting pipe 62 is connected (Japanese Patent Laid-Open No. 2000-220781).

  In this case, a fixing fitting 61 having a concave groove 63 formed on the outer peripheral surface is inserted between the blade 52 and the metal tube 51, and a fixing ring 64 is fitted into the concave groove 63 from above the blade 52. The end of 52 is fixed. The metal tube 51 is inserted into the connection pipe 62 after performing a secondary process of extending the waved end portion into a straight pipe 51a. Then, the insertion end portion of the connecting pipe 62 in the fixing bracket 61 is flared, and the O-ring 66 fitted in the fixing bracket 61 abuts on the flare portion 65. By coming into contact with the wave 67 on the front end side, fluid leakage at that portion is prevented.

  In the case of this structure, not only is it difficult to manage the manufacturing dimensional accuracy, but also the problem that it takes time and cost for manufacturing because it is necessary to stretch the wave once formed, flaring the connecting pipe 62, and the like. .

  In the case shown in FIG. 6, a metal tube 51 having a wave extending process and flaring processed at the tip is prepared in the same manner as described above, and a base ring 70 is provided between the straight pipe part 51 a and the blade 52. And the end of the blade 52 is clamped by fitting the press ring 71 to the base ring 70 (Japanese Patent Laid-Open No. 2004-76885).

  Further, a joint pipe member 74 having a tapered wall 73 corresponding to the inclination of the flare portion 72 of the metal tube 51 is prepared on the inner periphery, and the tapered wall 73 is provided via a flare extension portion 75 extending to the base ring 70. In order to hold down the flare 72, it is said that sufficient tensile strength in the axial direction can be obtained. However, even in this structure, it is necessary to stretch the wave and flare the tip. As in the case described above, there are drawbacks in that it takes time and effort to manufacture.

  All of the conventional techniques described above are of the type with a blade, but the same can be said for the type without a blade.

JP 2000-220781 A JP 2004-76885 A

  Since the conventional flexible metal hose terminal structure has the above-mentioned problems, the present invention does not have such a problem, that is, it is easy to manufacture and can be supplied at a relatively low cost, and it also prevents leakage for a long time. It aims at providing the terminal structure of the flexible metal hose which can hold | maintain an effect.

  The present invention surrounds a first part into which a wave-processed metal tube having a soft ring made of rubber, plastic or the like is inserted, and an end of the metal tube to which a pressing ring is fitted. The above-mentioned problem has been solved by a terminal structure of a flexible metal hose comprising a second component assembled to the end of the first component.

  Preferably, the first part has a tapered shape that expands toward the second part, and the first part has a stopper that holds the soft ring at an end thereof, and the second part The component is fixed to the first component by caulking the end of the component to the edge of the first component, and the second component includes a screw portion or other connection means for connecting another component. Prepare.

  With the movement of the first part to the second part side and the caulking stop for the second part, the inner peripheral surface of the soft ring bites into the metal tube wave and comes into close contact, so the sealing performance of that part is sufficient In addition, the metal tube is pressed by the holding ring and has sufficient tensile strength, so that it does not come out.

  The best mode for carrying out the present invention will be described with reference to the accompanying drawings. FIG.1 and FIG.2 is a fragmentary sectional view which shows an example of the terminal structure of the flexible metal hose which concerns on this invention. The flexible metal hose in this embodiment is composed of a metal tube 1 in which waves are formed as in the conventional one.

  In the present invention, the end of the metal tube 1 is covered with a soft ring 2 made of rubber or plastic. In the illustrated example, the soft ring 2 has a width applied to three waves, but may be wider or narrower than that. Preferably, the outer peripheral surface of the soft ring 2 is a tapered surface corresponding to the first component 3 described later.

  The first part 3 is a metal tapered cylindrical body having a stopper 4 extending inward at the small diameter side end portion and a caulking portion 5 at the large diameter side end portion. The caulking portion 5 is initially expanded as an extension of the tapered surface of the first component (see FIG. 1). The metal tube 1 is passed through the first part and the soft ring 2, but first the first part 3 is passed, and then the soft ring 2 is passed. And the 1st component 3 is shifted to the soft ring 2 side, and the soft ring 2 is held inside.

  Reference numeral 6 denotes a pressing ring that is fitted between the end waves of the metal tube 1. The presser ring 6 is a C-shape with one part cut off, or is divided and joined into a circular shape. In either case, the presser ring 6 is fitted to the end of the metal tube 1 in an open state. And closed in the valley 13 between the end waves.

  Reference numeral 7 denotes a second part coupled to the first part 3. The second part 7 functions as a joint, and has means for connecting other parts, for example, a male cylinder 8 for screwing other parts.

  On the end surface of the second component 7 on the first component 3 side, a metal tube receiving step portion 9 that receives and holds the end portion of the metal tube 1 and a ring receiving step that is located outside and receives the holding ring 6. Further, an outer step portion 11 for locking the caulking portion 5 is formed on the outer side of the ring receiving step portion 10 opposite to the ring receiving step portion 10. In addition, a retaining frame 12 that is in contact with the soft ring 2 is formed on the opposite side of the outer step portion 11.

  The second part 7 is composed of various components other than the metal tube receiving step 9, the ring receiving step 10, the outer step 11, and the retaining frame 12, in addition to the illustrated ones. It goes without saying that the structure of the embodiment can be realized.

  To configure the terminal structure, the metal tube 1 is first passed through the first part 3 and then through the soft ring 2. Then, after the pressing ring 6 is fitted to the valley 13 at the end of the metal tube 1, the soft ring 2 and the first part 3 are moved to the end side of the metal tube 1 until the soft ring 2 hits the pressing ring 6. Let At that time, if the first part 3 is moved, the soft ring 2 is moved by being pushed by the stopper 4. At this time, the caulking portion 5 of the first component 3 is expanded (state shown in FIG. 1).

  In a state in which the caulking portion 5 is expanded, the end 1a of the metal tube 1 in a state in which the second part 7 has entered the first part 3 and the soft ring 2 has been moved in the above-described manner is used. The two parts 7 are advanced, and the end 1a is stored in the metal tube receiving step 9 portion. In this state, the caulking portion 5 is caulked inward and locked to the outer step portion 11 (see FIG. 2). Thus, the second part 7 is swaged to the first part 3 and cannot be removed.

  In addition, the first part 3 is attracted to the second part 7 along with the caulking, and the soft ring 2 is forward-fed with the rear end face being pushed by the stopper 4. Since it contacts the holding ring 6 that cannot move forward by hitting the receiving step portion 10, further advancement is prevented, and it tries to escape to the upper surface side of the pressing ring 6. However, since there is a retaining frame 12 there, it is not possible to escape in that direction, and eventually escape is required between the waves of the metal tube 1. As a result, the soft ring 2 and the metal tube 1 are tightly and firmly bonded, and the sealing performance of that portion is extremely good.

  As described above, the terminal structure of the flexible metal hose according to the present invention has a feature that the number of parts is small, the structure is simple and easy to assemble, and a sealing means with sufficient performance is configured in accordance with the assembling work. doing.

  Although the present invention has been described in some detail with respect to its most preferred embodiments, it will be apparent that a wide variety of embodiments can be constructed without departing from the spirit and scope of the invention, the invention being defined by the appended claims. It is not restricted to the specific embodiment other than limiting in.

It is a fragmentary sectional view of one embodiment (before assembly) of the terminal structure of the flexible metal hose according to the present invention. It is a fragmentary sectional view of one embodiment (after assembling) of the terminal structure of the flexible metal hose according to the present invention. It is a fragmentary sectional view which shows one structural example of the terminal structure of the flexible metal hose by the conventional welding method. It is a fragmentary sectional view which shows the other structural example of the terminal structure of the flexible metal hose by the conventional welding method. It is a fragmentary sectional view which shows one structural example of the terminal structure of the flexible metal hose by the conventional non-welding method. It is a fragmentary sectional view which shows the other structural example of the terminal structure of the flexible metal hose by the conventional non-welding method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal tube 2 Soft ring 3 1st part 4 Stopper 5 Caulking part 6 Pressing ring 7 2nd part 9 Tube receiving step part 10 Ring receiving step part 11 Outer step part 12 Stopping frame 13 Valley

Claims (5)

  A first part into which a wave-processed metal tube covered with a soft ring such as rubber or plastic is inserted and an end of the metal tube to which a pressing ring is fitted are surrounded by the first part. A terminal structure for a flexible metal hose, comprising: a second component assembled to an end of the component.   The terminal structure of a flexible metal hose according to claim 1, wherein the first part has a tapered shape that expands toward the second part.   The terminal structure of a flexible metal hose according to claim 1 or 2, wherein the first part has a stopper that holds down the soft ring at an end thereof.   The terminal structure of the flexible metal hose according to any one of claims 1 to 3, wherein the second part is fixed to the first part by caulking an end of the second part to an edge of the first part.   5. The flexible metal hose terminal structure according to claim 1, wherein the second component includes a screw portion and other connection means for connecting other components. 6.

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