JPS6037354B2 - Plastic hose fastening components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fastening component for a plastic hose.

[Successful technology]

Plastic hoses are increasingly being used in place of rubber hoses, which have been widely used in the past.

Various reasons have been cited for this, but the most notable ones include light weight, high resistance to various oils and chemicals, simple manufacturing process, and ease of operation. For example, it is excellent. All of these points are attracting attention as promising future prospects for plastic hoses.

However, on the other hand, the only weak point, which can be said to be the biggest one, is that liquids such as oil leak from the fastening fittings when the operating temperature is about 6,000 ℃.

As is well known, the tube body of a plastic hose consists of an inner layer (inner tube) made of thermoplastic material such as nylon or Teflon, a synthetic fiber reinforcing layer made of braided vinylon thread, nylon thread, etc., and a protective outer layer (outer tube) made of polyurethane, nylon, etc. ) as the main component, and the construction of fastening metal fittings to the ends has followed the conventional technology used for rubber hoses. That is, the tube end of the plastic hose is inserted between the insert, which is a metal tube inserted into the inner tube, and the socket fitting, and the pipe portion of the socket fitting is crimped toward the inner tube. ing.

However, fastening techniques that are good for rubber hoses are not satisfactory for plastic hoses. That is, when a plastic hose is used at high temperatures for a long period of time, internal fluid tends to leak from the hose fitting connection portion. In other words, the inner tube of plastic hoses made of nylon, Teflon, etc., which forms the innermost part, has strong oil and chemical resistance. In use, it has a weak point where leakage occurs due to weakening of the connection part. Furthermore, although the binding layer of vinylon yarn or nylon yarn serves as a reinforcing layer to supplement the pressure resistance of the inner tube, it does not have anything to counteract the strength of liquid leakage. The outer layer made of extruded coating of nylon, polyurethane, etc. is only effective for maintaining the condition of the green reinforcing layer.
As described above, each of the three layers has three different characteristics, but when it comes to fastening and forming the metal fittings that are indispensable for the hose, there are completely different problems. In other words, with plastic hoses that use the same technology as rubber hoses, under high temperature and pressure, fluid leaks along the surface between the hose inner and the insert, and then the leaked fluid flows through the hose. It reaches the socket of the metal fitting and escapes, then reaches the hose body through the reinforcing layer, and finally escapes to the outside while causing a bulge in the outer part of the hose. This phenomenon becomes more noticeable at higher temperatures.

[Problems to be Solved by the Invention] The present invention solves the drawbacks of the prior art by taking measures to semi-permanently block the leakage and escape of liquid under high temperatures, thereby overcoming the position of plastic hoses. The aim is to contribute to further improvement.

[Means for solving problems]

The gist of the present invention is that, in a plastic fastening component formed by integrating a hose pipe body and a hose fitting, the ends of the hose pipe body are heat-sealed by thermally welding the inner tube, the reinforcing layer, and the outer part. form a department,
Moreover, between the outer surface of the insert and the inner tube surface of the hose tube or/and the end surface of the hose tube (
The point where the cross-linked elastomer is within the pressure stripe tightening range of the socket between the heat welded end (or heat welded end) and the inner surface of the closed diamond part of the socket, and the hose body and hose fitting are fastened and integrated. In the plastic fastening structure, the end of the hose tube is a heat-sealing end, and the end of the hose tube is a heat-sealing end, and there is a connection between the outer surface of the insert and the inner tube surface, and the end surface of the hose tube (or A cross-linked elastomer is press-refined and placed between the heat-sealed end) and the inner surface of the closing lid portion of the socket, and another cross-linked elastomer is placed between the surface where the closing lid portion of the socket contacts the insert. The reason is that it is arranged in a straight line.

[Effect]

The function of the present invention is to provide a hose pipe body which is formed by integrating an inner tube as an inner layer, a reinforcing layer on top of the inner tube, and an outer layer as a protective outer layer, and an insert portion whose end can be inserted into the inner tube. A hose consisting of a metal pipe body having an insert that can be inserted into the inner tube of the hose and a socket that is iron-coupled with the outer end of the hose and that is in opposition to the inside and outside of the insert and that can be integrated into the insert is fastened and integrated. In the plastic fastening component made of plastic, the end of the hose pipe body is thermally welded to the inner tube, reinforcing layer, and outer to completely prevent fluid in the inner tube from leaking into the reinforcing layer. and a cross-linked elastomer between the outer surface of the insert and the inner layer (inner tube) surface of the hose tube body and/or between the end face (or heat-welded end) of the hose tube body and the inner surface of the closing lid portion of the socket. The cross-linked elastomer generates internal stress in itself by compressing the socket vertically, and by utilizing the internal stress and the inherent rubber elasticity of the cross-linked elastomer, the internal fluid inside the inner tube is transferred to the hose pipe body. The purpose is to semi-permanently block the leakage path along the layer between the layers.

Furthermore, in the present invention, a cross-linked elastomer body is provided in a compressed state between the contact surfaces of the socket closure lid portion of the socket and the metal pipe body of the above-mentioned structure, thereby preventing leakage from the joint surface of the threaded portion. This prevents liquid leakage semi-permanently. These effects in the present invention do not decrease even when the temperature reaches 6,000 or higher, and can be increased as the temperature rises due to the elasticity of the rubber.

As a result, the plastic hose fastening component of the present invention can significantly improve the reliability of the plastic hose. [Example] Next, the fastening component of the plastic hose of the present invention will be explained with reference to the drawings.

FIG. 1 shows an embodiment of the fastening component of the plastic hose of the present invention. In FIG. 1, 1 is nylon;
Inner tube (inner layer) made of Teflon, etc., 2 is a reinforcing layer made of braided vinylon thread, nylon thread, etc., 3 is an outer tube (protective outer layer) made of polyurethane, nylon, etc.
For example, this is installed by using an extrusion molding machine,
The above three layers are integrated to form the hose pipe body 4.

In addition, in this case, the end portion of the hose tube body 4 is thermally melted so that each portion of the inner tube 1, reinforcing layer 2, and outer tube 3 is melted and integrated to form a heat-welded end portion 6, which is a part of the feature of the present invention. It's off. 6 is a metal tube having a part inserted into the end of the inner tube 1 and has an insert 7, and the insert 7 has a sliding door shape as a whole, and an S. Mirror-toothed tubular end portions S to S5 are formed.

Reference numeral 8 denotes a fastening socket fitting, which consists of a closing lid part C and a compression warp part S. In this case, by screwing the threaded part 10 of the socket 8 into the threaded part 9 of the metal tube body 6, the hose fitting is attached. It constitutes the concrete.

1 1 is a ring-shaped cross-linked elastomer object, which is inserted into the inner part of the gap formed by the insert 7 and the socket 8 in a ring shape, and is compressed appropriately and then inserted into the hose pipe body. Attached to the 4 ends.

As the elastomer object 11, one of the following materials is adopted depending on the usage conditions and circumstances. That is, there are natural rubber, butyl rubber, nitrile rubber, styrene-butadiene rubber, fluorine rubber, etc., and all of these have qualities that are useful for the purpose of the present invention. The fastening component of the plastic hose having such a configuration is the above-mentioned 7 and 8 of the hose fitting constituted by the insert 7 and the socket 8.
The ring-shaped crosslinked elastomer object 11 and the end of the hose tube 4 are inserted into the gap formed by the hose tube 4.
Heat welding in which the inner tube 1, reinforcing layer 2, and outer 3 are melted and integrated by pressing the inner tube 1, the reinforcing layer 2, and the outer 3 into one by pressing the hose substantially parallel to the cross section of the hose tube onto a metal fitting plate (not shown) heated above the melting point of the material constituting the tube. It can be easily manufactured by inserting the end portion 5 and subsequently pressing and tightening the S portion on the outer periphery of the socket 8 using a socket compressor (not shown).

According to such a configuration, first, when the compression bond is compressed, a strong internal stress is generated in the crosslinked elastomer object 11 itself;
Sealing is ensured and the parentheses remain semi-permanent for a long period of time. In addition, the ends of the hose pipe body 4 are heat welded to form a heat-sealed end 5.
By doing this, there is no possibility that liquid will enter into the reinforcing portion 2 of the hose pipe body 4. In addition, Figure 2 shows the liquid leakage start time vertically and the temperature horizontally, and a hose fitting with an insert and socket at the end of a plastic hose was simply tightened vertically without taking any measures (A: hose inner diameter 13
．． 5, B: Hose inner diameter 12.5), C: Hose inner diameter 1
3.00), a hose whose end surface is simply filled with a liquid or paste-like crosslinked polymer material with good adhesion (see Special Publication No. 48-126973), and a crosslinked elastomer that is simply pressed in advance. Bond striped cotton and arranged E
8-126972 Publication (see Figure 2) and Example F shown in Figure 1 obtained by the present invention, the start time of liquid leakage from each hose fastening section at each temperature was measured. The results are shown below.

As is clear from Figure 2, cases A and B for which no special measures are taken
For and C, liquid leakage could hardly be prevented at 100 qo, and in case of D, liquid leakage occurred after about 2 steps at 100 qo, and in case of E, after about 4 steps at 100 qo. , Regarding F of the present invention, there was no liquid leakage at temperatures lower than 100°C, and 1
At 00q0, there was almost no liquid leakage even after 120qo hours or more.

Next, FIG. 3 shows another embodiment of the plastic hose fastening component of the present invention, in which (
In the figure, the same reference numerals as in FIG. 1 indicate the same layer or equivalent part.

The same applies to the following figures. ) This is an invention in which some features are added to the invention as shown in FIG. are arranged in a compressed state by the screwing of the socket 8 (or the screwing of the threaded parts 9 and 10). In this case, in order to prevent movement of the crosslinked elastomer 13 during screwing, a groove 14 having a V-shaped cross section and a ring shape is particularly provided on the side surface of the hexagonal head, but it may also be provided on the socket side 8. Depending on the case, a structure in which only the elastomer body 13 is provided without requiring a groove may be used. With such a configuration, not only the effect obtained in FIG. 1 is obtained, but also the effect of semi-permanently preventing liquid leakage from the joint surface of the threaded portions 9 and 10 by arranging the elastomer 13.

In addition, as a result of experimenting with G shown in FIG. 3 in the same way as in FIG. 1, that is, with conventional examples A, B, C, D, and E as described above, The results were similar to those of F, and there was almost no liquid leakage even after 12 cycles or more at 10,000.

[Effects of the Invention] As explained above, the plastic hose fastening component of the present invention can semi-permanently block the leakage and escaping path of liquid under high temperatures, and is industrially useful.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a cutaway front view of the main parts showing an embodiment of the plastic hose fastening component of the present invention, and FIG. 2 shows the conventional hose fastening component and the fastening component of the present invention. The figure shows the relationship between the temperature and the start time of liquid leakage for the fastening component. FIG. 3 is a cutaway front view showing another embodiment of the fastening component of the plastic hose of the present invention. 1...
... Inner tube, 2 ... Reinforcement layer, 3.
...Outer tube, 4...Hose pipe body, 5...
... River weld weave, 6... Metal tube body, 7... Insert, 8... Socket, 9, 10... Threaded part, 11
, 13...Crosslinked elastomer, 14...Groove, C
. . . Closing lid portion, S . 2nd figure 3rd figure

Claims (1)

[Scope of Claims] 1. At least the upper layer of the inner tube made of nylon, Teflon, etc. forming the inner layer is integrated with a reinforcing layer made of braided vinylon thread, nylon thread, etc., and a protective outer layer made of polyurethane, nylon, etc. as the outer constituent material. a metal tube body having an insert that can be inserted into an inner tube at the end of the hose tube body, and a metal tube body having an insert that can be inserted into an inner tube at the end thereof, and fitting with the hose end outer,
In a plastic fastening component formed by fastening and integrating a hose fitting consisting of a socket that is in an inside-outside relationship with the insert and can be integrated with the insert, the end of the hose pipe body is connected to the inner tube; the reinforcing layer A heat welded end is formed by heat welding the inner tube and the outer, and a heat welded end is formed between the inner surface of the insert and the inner layer (inner tube) surface of the hose tube, and/or a heat welded end is formed between the inner surface of the insert and the inner tube surface of the hose tube. A cross-linked elastomer is provided between the socket part) and the inner surface of the closing lid part of the socket, and the cross-linked elastomer is compressed within the compression tightening range of the socket, and this compression tightening causes the elastomer itself to undergo compression. A fastening component for a plastic hose, characterized by semi-permanently blocking a path through which an internal circulating fluid under high temperature and pressure leaks along between the laminated surfaces of the hose tube body due to the outward action of internal stress. 2. A hose pipe body made up of at least an inner tube made of nylon, Teflon, etc. that forms an inner layer, a reinforcing layer made of a braided vinylon thread, nylon thread, etc. as an upper layer, and an outer layer of polyurethane, nylon, etc. that forms a protective outer layer. A hose fitting comprising a metal tube having an insert that can be inserted into an inner tube at the end thereof, and a socket that fits into the outer end of the hose, is in an internal-internal opposition relationship with the nipple, and can be integrated into the insert. In the plastic fastening component formed by the integrated fastening,
The end of the hose forms a heat-welded part by heat-welding the inner tube, the reinforcing layer, and the outer, and the hose end is formed between the outer surface of the insert and the inner layer (inner tube) surface of the hose pipe body, and/or between the inner tube, the reinforcing layer, and the outer layer. a cross-linked elastomer object is located in a compression-fastened state between the layer mouth surface (or heat-welded end) of the tube and the closing lid portion of the socket;
Moreover, the fastening component for a plastic hose is characterized in that a crosslinked elastomer object is provided in a compressed state between the faces of the closing lid portion of the socket in contact with the metal pipe body.