JPS6011349Y2 - Plastic hose fastening components - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a new fastening component for a plastic hose.

[Conventional technology]

Plastic hoses are increasingly being used to replace the traditionally widely used rubber hoses.

Various features have been cited as reasons for this, but the most notable ones include light weight, high resistance to various oils and chemicals, and a simple manufacturing process that improves workability. 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 limit is about 60°C.

As is well known, the body of a plastic hose is made of nylon.
A thermoplastic inner tube such as Teflon, a synthetic fiber reinforcing layer made of vinylon thread, nylon thread, etc., and a protective outer layer (outer) made of polyurethane, nylon, etc. are integrated as the main constituent materials. In the structure of fastening metal fittings to the parts, the conventional technology used in the past for rubber hoses has been followed as is.

In other words, 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 part of the socket fitting is crimped toward the inner tube. It's coming.

However, while the good fastening technology for rubber hoses is insufficient for plastic hoses, it has been pointed out that when used for long periods of time at high temperatures, there is often a tendency for internal fluid to leak from the hose fitting joints. It has come to be recognized that there is a limit value to the temperature at which it can be used, as mentioned above, about 60°C.

In plastic hoses, the inner tube, which is the innermost part of the hose, is made of nylon, Teflon, etc., and is oil-resistant.
Although they are characterized by strong chemical resistance, they do not have the weak point of causing liquid leakage due to weakening of the fastening and connecting parts due to long-term or repeated use in applications such as high-temperature pressure oil. In addition, the braided layer of vinylon thread and nylon thread serves as a reinforcing layer to supplement the pressure resistance of the inner tube.
It has nothing to counteract the persistence of liquid leakage.

The outer layer made of extruded coating of nylon, polyurethane, etc., which ultimately covers and protects these, has no effect, especially in maintaining the normal state of the braided reinforcing layer.

In this way, each of the three members exhibits the characteristics of the three and has a comprehensive effect to maintain the superiority of the plastic hose pipe body, but in the fastening structure of the metal fittings that are indispensable for the hose. In other words, they had a completely different problem.

In other words, with the same technology as in the case of rubber hoses, liquid leakage occurs along the surface between the hose inner and the insert under high temperature and pressure, reaches the socket of the hose fitting and escapes, and then leaks through the reinforcing layer. This means that the hose reaches the hose body and escapes while causing the hose outer to bulge, which means that the phenomenon becomes more pronounced at high temperatures.

[Problem that the invention attempts to solve]

This invention aims to solve the above drawbacks by taking measures to semi-permanently block the leakage and escaping paths of liquid under high temperatures. The aim is to contribute to the further improvement of

[Means for solving problems]

The gist of this is that in the fastening component of a plastic hose, each hose fitting is fastened and integrated to the end of the hose pipe body, which is made up of an inner tube, a reinforcing layer and an outer formed in sequence. The end of the hose tubular body is separated from the heat-melted solidified end formed by once melting the inner tube, reinforcing layer and outer layer at the end with heat and then solidifying the end, and furthermore, the heat-melted solidified end The part having the part is compressed and compressed from the socket metal part, and the cross-linked elastomer object is located in a compressed state between the surfaces of the socket and the closing lid part of the socket that is in contact with the outer surface of the insert of the metal pipe body. be.

[Effect]

The effect of the present invention is that a reinforcing layer and an outer tube are sequentially formed on an inner tube, and in a plastic hose fastening component that is integrated with each hose fitting at the end of the hose pipe body, the hose The inner tube, the reinforcing layer, and the outer layer at the end of the tube are once melted with heat and then solidified to form a heat-melted solidified end, and the part having the heat-melted solidified end is crushed from the socket metal part. By compressing the metal tube and placing a cross-linked elastomer object in a compressed state between the surfaces of the socket and the closing lid part in contact with the outer surface of the insert of the metal tube, liquid infiltration into the hose tube reinforcing layer is prevented. This effectively prevents fluid from leaking from the integrated portion of the insert and the socket.

That is, in the plastic hose fastening structure of the present invention, the end of the hose is thermally welded to form a heat-melted and solidified end, so unlike the conventional case, liquid will not penetrate into the reinforcing layer of the hose tube and cause the outer layer to swell. There is no such thing as forcing them to do anything.

In addition, by compressing and positioning a cross-linked Elakadomer object between the end of the hexagonal head and the outer surface of the closing lid part C of the socket, leakage of liquid to the outside of the hose fitting is completely prevented. It is.

〔Example〕

Hereinafter, one embodiment of the fastening component of the plastic hose of this invention will be described with reference to the drawings.
is an inner tube (inner layer) made of nylon, Teflon, etc.
2 is a reinforcing layer made of braided vinylon thread, nylon thread, etc.;
3 is an outer layer (protective outer layer) of polyurethane, nylon, etc.
The inner tube 1 and outer tube 3 are extruded using, for example, an extrusion molding machine, and the three layers are integrated to form a hose pipe body.

Moreover, in this case, the end of the hose pipe body 4 is
By applying heat to the end, each layer of the inner tube 1, reinforcing layer 2, and outer tube 3 is melted almost simultaneously by heat, and then solidified to form a heat-melted and solidified end 5. This section describes some of the features of this invention.

Reference numeral 6 denotes a metal tube having an insert 7 inserted into the end of the inner tube 1, and the insert 7 has a wedge shape as a whole, and a serrated tubular step called S1 or tortoise is provided on the circumference of the fitted body. forming a section.

Reference numeral 8 denotes a socket fitting for fastening, which consists of a closing lid part C and a crushing and tightening part S. In this case, the threaded part 10 of the socket 8 is screwed into the threaded part 9 of the metal tube body 6 to connect the metal It is configured to be integrally connected to the pipe body 6.

Reference numeral 11 denotes a hexagonal head 12, which is a cross-linked elastomer body having a V-shaped cross section and a ring shape, and has a hexagonal head 12 on a metal tube body.
It is located in a compressed state between the end surface of the socket 8 and the outer surface of the closing lid portion C of the socket 8.

Moreover, in this case, a V-shaped ring-shaped groove 13 is provided in advance on the end surface of the hexagonal head 12 in order to prevent the elastomer object 1 from moving when the socket 8 is screwed into the insert 7. However, a groove may be separately provided on the side of the closing lid portion C, and in extreme cases, it may be arranged between the end surface of the hexagonal head 12 which does not have a groove and the outer surface of the closing lid portion C.

Note that as the material for the crosslinked elastomer object 11, one of the materials listed below is adopted depending on the conditions and circumstances of use.

That is, natural rubber, butyl rubber, nitrile rubber, styrene-butadiene rubber, fluorine rubber, etc. are all recognized as having qualities that are useful for the purpose of the present invention.

The state indicated by the solid line in the figure is a finished product. First, the end of the hose tube body 4 is heated to a temperature higher than the melting point of the material of each layer constituting the hose tube body 4, such as a metal plate (not shown). The inner tube 1. is attached to the end of the hose by pressing the inner tube 1. After the reinforcing layer 2 and the outer tube 3 are melted and integrated, an end portion of the hose pipe body 4 is prepared, which is solidified by cooling to form a heat-fused solidified end portion 5, and a socket 8 is screwed in advance. By screwing them together, a gap is formed between the socket 8 and the insert 7 (when they are screwed together, the crosslinked elastomer 11 is located in a compressed state between the end surface of the hexagonal head 12 and the outer surface of the closing lid portion C.

), the end of the hose tube body 4 is inserted into the gap, and is later compressed and compressed by a crushing and tightening device (not shown) of the socket 8, thereby making the hose tube body 4 have a hose fitting for the end. The fastening integration is completed.

Because of this configuration, by first heat-sealing the ends of the hose tubular body 4 to form the heat-melted and solidified end portions 5, the liquid enters the reinforcing layer of the hose tubular body 4 as in the conventional case, and the outer layer is coated. There is no swelling at all, and at the same time, the integrated part of the conventional insert and socket (in this case, between the joint surfaces of the threaded part 10 of the socket 8 and the threaded part 9 of the insert 7)
However, even if liquid leaks as in the conventional case, according to the present invention, the hose is closed by the cross-linked elastomer object 11 located between the end face of the hexagonal head 12 in the middle and the outside of the closing lid part C of the socket 8. This has the effect of preventing liquid leakage to the outside of the metal concrete.

In addition, Figure 2 shows the leak start time vertically and the temperature horizontally. No countermeasures were taken; an insert was simply inserted into the end of the plastic hose, and the socket was crushed in the direction of the insert on the outer periphery of the end. One that is compressed (A: Hose inner diameter 1
3.5φ, B: hose inner diameter 12.5φ, C: hose inner diameter 13.0φ), and the hose end surface is simply filled with a liquid or paste-like uncrosslinked polymeric material with good adhesiveness, and D and the first of the present invention. The results of an experiment on the start time of liquid leakage from each hose fastening component at each temperature using Example E shown in the figure are shown.

According to this, for items A, B and C that do not take any special measures, 100'C! In the case of D, it is almost impossible to prevent liquid leakage, and in the case of D, it is 100'C! According to the product E of the present invention, liquid leakage occurred in about 3 turns at 100'C, but after 10 hours
At temperatures lower than 0°C, the device of the present invention did not leak at all.

[Effect of idea]

The plastic hose fastening component of this invention effectively prevents liquid leakage at high temperatures, and its operating temperature limit is 10
The temperature has been raised to nearly 0°C, and it is useful for industrial use.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of the plastic hose fastening structure of this invention, and Fig. 2 shows the leakage initiation time for each temperature using the plastic hose fastening structure of this invention and the conventional fastening structure. This shows the experimental results. 1... Inner tube, 2... Bent reinforcement layer, 3
...Outer, 4...Hose pipe body, 5
・Curved/thermal melted solidified end, 6...Metal tube body, 7.
...insert, 8...socket), 9.10.
- Curved threaded portion, 11... Curved cross-linked elastomer, 12...
...Hexagonal head, 13...Groove, S...
・Occluded lid part, S...Crushing and tightening part, S□~S
4...Sawtooth-shaped annular step.

Claims (1)

[Scope of utility model registration request] A hose tubular body that is integrated with at least an inner tube made of nylon, Teflon, etc., which forms an inner layer, a reinforcing layer made of a braided vinylon thread, nylon thread, etc., and an outer protective outer layer made of polyurethane, nylon, etc. From the insert of the metal pipe inserted into the inner tube at the end, the closing lid part that comes into contact with the end face of the hose pipe body, and the crushing and tightening part that is covered with the steam outer and is in a relationship between the inside and outside of the insert. and also has a socket fitting that can be integrated into the insert,
The end of the hose pipe body has a heat-melted and solidified end by heat-melting and solidifying the inner tube, the reinforcing layer, and the outer end, and the part having the heat-melting and solidifying end is It is crushed and compacted within the crushing and compacting range,
Moreover, the fastening component for a plastic hose is characterized in that a cross-linked elastomer object is positioned in a compressed state between the surfaces of the outer surface of the closing lid portion of the socket that are in contact with the outer surface of the insert.