JPH1182841A - Hose joint fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hose joint fitting that can prevent initiation of corrosion of a reinforcing layer caused by infiltration of water or the like from a clearance formed between a rubber hose and a fitting connection part and attain common use and integration of the joint fitting to various rubber hoses for high presssure piping different in outer diameter dimensions. SOLUTION: A rubber hose 8 with a reinforcing layer 4 exposed by the specified length by eliminating an outer surface rubber layer 3 of the rubber hose 8 is inserted in a nipple fitting 6 of a hose joint fitting, and the outer peripheral surface of the inserted rubber hose 8 is fastened and fixed by an outer cylinder fitting 2 provided with ring-like or thread-like rugged shape on the inner surface, and twostage step difference different in inner diameter dimension provided at the end part on the rubber hose 8 insert side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rubber hose for a low-pressure rubber hose having a small outer diameter or a nipple fitting having a large-diameter high-pressure rubber hose inserted therein. And a hose joint fitting capable of caulking and fixing an outer rubber layer of the rubber hose with an appropriate force using the outer cylinder fitting.

[0002]

2. Description of the Related Art Conventionally, a hose joint fitting for connecting a rubber hose mainly used for high-pressure piping is shown in FIG.
As shown in the figure, the reinforcing layer 4 made of steel wire or the like on the inner surface rubber
A nipple fitting 6 for inserting an inner diameter portion of a rubber hose 8 for high-pressure piping composed of an outer rubber layer 3 is provided at one end, and a connecting portion 7 for connecting to a piping port is provided at the other end. In order to retain the function of preventing fluid leakage from the inserted rubber hose 8, a ring-shaped or screw-shaped concave and convex shape is formed on the inner surface so that the nipple fitting 6 having various groove shapes and the inner cylindrical portion of the rubber hose 8 are integrally fixed and held. The outer tube fitting 2 is crimped and fixed from above the inserted rubber hose 8.

At this time, a rubber hose 8 generally used is used.
The connection method between the hose and the fitting is as follows.
When the outer rubber layer 3 is inserted into the nipple metal 6 in the longitudinal direction, the outer rubber layer 3 has a shape that is the same as the uneven shape on the inner cylinder side of the outer cylinder 2
Is removed and the reinforcing layer 4 is exposed, and the outer tube portion of the outer tube member 2 is uniformly deformed and pressed by a jig toward the center axis of the joint member.
And a hose joint fitting are connected and integrated.

For this reason, the outer rubber layer 3 of the rubber hose 8 having the same position as the inner diameter portion 5 of the outer cylinder fitting 2 on the side where the rubber hose 8 is inserted is formed integrally with the rubber hose 8 and the hose joint fitting. When the assembled assembly is used,
From the end inner diameter portion 5 which is a connection portion between the rubber hose 8 and the hose fitting shown in FIG. 5, a fluid that induces corrosion of the steel wire of the reinforcing layer 4 such as water or steam flows into the outer cylindrical metal fitting 2. The penetration causes corrosion and deterioration of the reinforcing layer 4.

[0005] In order to prevent the occurrence of corrosion and deterioration, it is necessary that the inner diameter portion 5 at the end of the outer cylinder 2 and the outer rubber layer 3 have a proper adhesion, and as a measure, the removal length of the outer rubber layer 3 is required. In this case, the inner diameter of the outer cylinder 2 is adjusted to the size of the outer rubber layer 3 by adjusting the inner diameter of the outer cylinder 2 to the outer diameter of the rubber hose 8. That is being done.

[0006] Further, Japanese Patent Application Laid-Open No. Hei 8
As disclosed in the invention of JP-A-170772, the outer rubber layer 3 is removed to expose the reinforcing layer 4 of a predetermined length, and the exposed reinforcing layer 4 is inserted into the nipple fitting 6 and the outer periphery thereof. The surface is fixed by caulking with an outer cylinder 2 having a groove projection on the inner surface, and the taper angle of the inner diameter portion 5 at the end of the outer cylinder 2 is set, and the outer peripheral surface of the outer rubber layer 3 is tapered. Crimping is also performed.

[0007] However, in any of the above hose fittings, if the amount of pressure applied to the outer rubber layer 3 is not appropriate, for example, if the amount of pressure applied is too small, the rubber hose 8 and the fitting connection of the hose fitting are connected. Corrosion occurs in the reinforcing layer 4 due to intrusion of water or the like from the created gap, which causes a problem. On the other hand, when the amount of pressure bonding is excessive, there is a problem that the outer rubber layer 3 is cut off or the outer rubber layer 3 swells at the connection portion between the rubber hose 8 and the joint fitting.

[0008] In order to solve these problems, it is necessary to adapt a hose fitting fitting set to an optimal size corresponding to each hose. However, in consideration of the pressure used, the rubber hose 8 for high-pressure piping has a different outer diameter even with the same nominal size. An assortment of fittings is required.

As a result, the use and integration of the hose fittings are hindered, and problems such as an increase in the types and stocks of the fittings and an increase in management costs arise.

[0010]

SUMMARY OF THE INVENTION The present invention can prevent the corrosion of the reinforcing layer due to the intrusion of water or the like from the gap formed between the rubber hose and the fitting connection portion of the hose fitting, and can prevent the occurrence of corrosion. A hose joint fitting capable of sharing and integrating joint fittings for various types of rubber hoses for high-pressure piping having different diameters.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a rubber hose for a high-pressure pipe comprising a reinforcing layer and an outer rubber layer is removed to expose a reinforcing layer of a predetermined length, and the rubber hose is connected to a nipple of a hose fitting. The rubber hose was inserted into the fitting, and the outer peripheral surface of the inserted rubber hose had a ring-shaped or screw-shaped uneven shape on the inner surface, and two steps having different inner diameters were provided at the end on the side where the rubber hose was inserted. Start with a hose fitting that is crimped and fixed with an external fitting.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a hose fitting according to the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which a rubber hose 8 having a small outer diameter is connected to the hose fitting. Reference numeral 3 denotes a state in which a rubber hose 8 having a large outer diameter is connected to the same hose fitting.

The above-described hose fitting has a nipple fitting 6 for inserting an inner diameter portion of a rubber hose 8 at one end, and a connecting portion 7 connected to a piping port at the other end. The rubber hose 8 having the rubber layer 8 having a predetermined length and the reinforcing layer 4 exposed by removing the outer rubber layer 3 of the rubber hose 8 including the outer rubber layer 3 is inserted into the nipple fitting 6. Next, the outer peripheral surface of the inserted rubber hose 8 has a ring-shaped or screw-shaped uneven surface on the inner surface, and the inner diameter of the rubber hose 8 at the end on the side where the rubber hose 8 is inserted is X shown in FIG.
External metal fitting 2 provided with two different steps, such as Y shown in FIG.
Are uniformly deformed and pressed by a jig or the like toward the center axis of the hose fitting and fixed by caulking.

Therefore, when the outer diameter of the rubber hose 8 is small as shown in FIG. 1 and FIG. 2 which is an enlarged sectional view of the arrow A in FIG. When the outer rubber layer 3 is crimped, on the other hand, when the outer diameter of the rubber hose 8 is large, as shown in FIG. 4, the outer rubber layer 3 is crimped at a step on the distal end side indicated by the inner diameter Y of the outer cylinder 2. Yes,
Thereby, the inner surface of the outer tube fitting 2 and the outer surface rubber layer 3 are appropriately pressed at the portions indicated by arrows R in FIGS. 2 and 4, respectively.
Intrusion of water or the like from the outside can be prevented, and no damage such as generation of rust inside the outer tube fitting 2 or breakage due to excessive pressing of the outer rubber layer 3 of the rubber hose 8 by the outer tube fitting 2 occurs.

As shown in FIG. 2, when the rubber hose 8 having a small outer diameter is connected to and integrated with the hose fitting, the outer rubber layer 3 is formed at the step on the back side of the outer cylindrical fitting 2.
When the crimp amount of the hose assembly becomes extremely large, the escape groove 9 is provided in the middle of the step on the back side, thereby alleviating the excessive compression of the outer rubber layer 3 and preventing the performance of the hose assembly product from being impaired. be able to.

As a result, it is possible to share the hose joint fitting for various rubber hoses 8 having different outer diameters without impairing the performance of the hose assembly product.

[0017]

According to the hose fitting of the present invention described above, water enters through the gap between the inner surface of the outer cylinder and the rubber layer on the outer surface of the rubber hose, which has been a problem with the conventional fitting, and the inside of the fitting has been removed. Can be prevented, and the outer rubber layer can be prevented from being damaged due to excessive pressing of the outer rubber layer.

Further, hose joint fittings can be shared and integrated for rubber hoses for various high-pressure pipes having different outer diameters. Furthermore, by integrating the hose fittings, it is possible to reduce the types of hose fittings and the number of stocks, and to reduce the management cost.

[Brief description of the drawings]

FIG. 1 is a side view of a cross section of a main part showing a state in which a rubber hose having a small outer diameter is connected to a hose fitting in one embodiment of the present invention.

FIG. 2 is an enlarged side cross-sectional view of a main part showing an arrow A part of FIG. 1;

FIG. 3 is a side view of a cross section of a main part showing a state in which a rubber hose having a large outer diameter is connected to the hose fitting hardware of FIG. 1;

FIG. 4 is an enlarged side sectional view of a main part indicated by an arrow B in FIG. 3;

FIG. 5 is a side view of a cross section of a main part of a conventional hose fitting.

[Explanation of symbols]

 2 Outer tube fitting 3 Outer surface rubber layer 4 Reinforcement layer 6 Nipple 8 Rubber hose

Claims (1)

[Claims] 1. A rubber hose having a reinforcing layer and an outer rubber layer and having a rubber layer for a high-pressure pipe, the outer rubber layer of which is removed to expose a reinforcing layer of a predetermined length, is inserted into a nipple metal fitting of a hose fitting, and the insertion thereof is performed. The outer surface of the rubber hose has a ring-shaped or screw-shaped uneven shape on the inner surface,
A hose joint fitting fixed by caulking with an outer tubular fitting having two steps with different inner diameters at the end on the side where the rubber hose is inserted.