JPH09242960A - Hose connection fittings - Google Patents

Abstract

(57) [PROBLEMS] To easily and reliably obtain conduction between a metal wire reinforcing layer of a hose for transporting a flammable fluid and a nipple of a connecting fitting. A hose 20 is connected to a nipple 13 of a joint 10.
Is externally fitted from the tip of the hose and is inserted until the tip of the hose comes into contact with the base portion 14, and the tip of the metal wire reinforcing layer 22 is brought into contact with the positioning convex portion 14a to establish a conductive state. The tubular member 30 is covered on the nipple including the fitted hose, and is caulked and fixed to the nipple. Due to the caulking of the tubular member, the hose tip portion is rolled, and the inner resin layer 21 is greatly extended compared to the metal wire reinforcing layer, but the rolled portion extends into the recess 14b space below the positioning protrusion, The metal wire reinforcing layer is pressed against the positioning protrusion to secure the electrical connection with the base. This eliminates the need to peel off the outer protective layer at the tip of the hose, and makes the connection simple and reliable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose connection joint in which a hose for transporting a flammable fluid such as paint or LPG is inserted and covered with a tubular member and caulked, and in particular, the hose is electrically charged. To deal with static electricity.

[0002]

2. Description of the Related Art In a hose for transporting a flammable fluid such as paint or LPG, static electricity is unavoidable due to friction between the fluid inside the hose and the fluid as the flammable fluid flows. There is a risk that sparks may be generated due to static electricity to ignite flammable gas in the surrounding area, or pinholes may be generated in the resin layer, damaging the hose and leaking fluid. Therefore, as shown in FIG. 3, a conventional hose 4 for transporting a flammable fluid is produced by braiding a metal wire such as a hard steel wire or a SUS wire between an inner resin layer 4a and an outer protective layer 4c, and applying the inner pressure of the hose. By utilizing the metal wire reinforcing layer 4b provided to prevent breakage and crushing due to the application of external force, static electricity is released to the hose connection joint to prevent charging of the hose.

Specifically, a hose 4 for transporting a flammable fluid
As a hose connection joint 1 to which is connected, for example, one shown in FIG. 3 is known. The hose connection joint 1 is provided with a base portion 3 protruding in a flange shape at a predetermined position apart from the tip of the nipple 2 (hose insertion cylinder portion), and removing the outer protective layer 4c in a predetermined range corresponding thereto. The hose 4 with the exposed metal wire reinforcement layer 4b is fitted onto the nipple 2 and pressed until the tip of the hose comes into contact with the base 3. Then, a cylindrical metal sleeve 5 is fitted to the exposed portion of the metal wire reinforcing layer 4b of the hose 4 that has been externally inserted, and by caulking and fixing, the two are brought into conduction to form a connection joint. As a result, the static electricity generated between the fluid and the resin layer 4a on the inside of the hose and charged on the hose 4 is collected in the metal wire layer 4b and collectively grounded through the hose connection joint 1.

[0004]

However, in the hose connecting joint 1, it is very troublesome to peel off the tip portion of the outer protective layer 4c of the hose 4, which makes the hose connecting cost expensive. On the other hand, the outer protective layer 4c
It was considered to form the connection joint without removing the tip portion of the inner resin layer 4 when caulking and fixing the metal sleeve 5 as shown in FIG.
a and the outer protective layer 4c extend more than the metal wire reinforcing layer 4b. The outer protective layer 4c is not a problem because it can extend between the upper end of the base 3 of the nipple 2 and the inner surface of the metal sleeve 5. However, the inner resin layer 4a
The extended part loses the escape area, and after contacting the base 3,
At the same time as it works to retract the tip of the metal wire reinforcing layer 4b, the metal wire reinforcing layer 4b enters between the metal wire reinforcing layer 4b and the base portion 3 and prevents contact between the metal wire reinforcing layer 4b and the base portion 3.
As a result, the movement of static electricity from the metal wire reinforcing layer 4b to the nipple 2 is hindered, and there is a risk that static electricity accumulated in the metal wire reinforcing layer 4b causes sparks. The present invention is intended to solve the above-mentioned problems, and it is possible to easily and reliably obtain the electrical connection between the metal wire reinforcing layer of the hose for transporting the flammable fluid and the nipple of the joint without peeling off the outer protective layer of the hose. It is an object of the present invention to provide a hose connection joint that can be used.

[0005]

In order to achieve the above object, the structural feature of the invention according to claim 1 is that the inner resin layer, the metal wire reinforcing layer, and the outer protective layer are sequentially formed. A hose insertion tube that is fitted over the tip by a laminated hose, a base that protrudes like a collar at the base of the hose insertion tube that is far from the tip of the hose insertion tube, and the diameter of the base. The ring-shaped protruding protrusions from the predetermined area on the outer peripheral side toward the tip of the hose insertion tube, and the hose insertion tube for caulking and fixing the hose in contact with the positioning projections. And a tubular member that is externally fitted to the externally inserted hose.

In the invention according to claim 1 configured as described above, a hose provided with an inner resin layer, an outer protective layer, and a metal wire reinforcing layer sandwiched between the inner resin layer and the outer protective layer is attached to a hose for connecting a hose. The tip end is brought into contact with the positioning protrusion protruding from the base by being externally fitted to the cylindrical portion, and the metal wire reinforcing layer is brought into contact with the positioning protrusion to bring the two into conduction. Subsequently, by covering the hose insertion tubular portion including the hose fitted to the hose insertion tubular portion with the tubular metal fitting and further caulking and fixing it, the hose is firmly fixed to the hose insertion tubular portion. By crimping the tubular fitting, the hose tip is rolled, especially the inner resin layer and the outer protective layer are greatly extended compared to the metal wire reinforcing layer, but the rolled portion of the inner resin layer, which is a problem, is Since the lower side of the positioning protrusion that is provided and protrudes toward the tip side of the hose insertion cylinder is a recess, it extends into and enters the recess space. Therefore, the metal wire reinforcing layer is pressed against the positioning protrusion without being hindered by the rolled portion of the inner resin layer,
The electrical connection with the positioning protrusion is ensured.

As a result, according to the first aspect of the invention, the metal wire reinforcing layer and the positioning convex portion of the hose insertion tube portion can be formed without the work of peeling and removing the outer protective layer at the tip portion of the hose. It is possible to obtain a hose connection joint in which the conduction state of is reliably taken. Therefore, the static electricity charged in the metal wire reinforcing layer can be released to the ground wire through the hose connection joint, and the sparks caused by the static electricity cause ignition of the surrounding combustible gas and the pin generated in the resin layer. It is possible to reliably prevent damage such as hose damage due to holes and fluid leakage. Furthermore, since the peeling work of the outer protective layer can be omitted, the hose connecting work time can be significantly shortened and the manufacturing cost thereof can be reduced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows a hose connection joint of a painting hose according to the embodiment with a partial sectional view. Is. The joint 10 has a tubular shape made of steel and is provided with a hexagonal convex portion 11 having a hexagonal cross-section that is radially expanded in the vicinity of one end. One end of the hexagonal convex portion 11 is connected to a paint spray gun or pump side connecting end that connects the hose 20, and the connecting end and the nipple 12 are fitted by a nut 40. The nipple 12 has a taper portion 12a having a tapered tip portion, and a root contacting the hexagonal convex portion 11 has a ring-shaped insertion concave portion 12 into which the tip 41 of the nut 40 is fitted.
b. The other end of the hexagonal convex portion 11 is a nipple (hose insertion cylinder portion) 13 into which a painting hose is inserted. The nipple 13 is provided with a hose positioning base portion 14 protruding in a ring shape at a position near the hexagonal convex portion 11. The base portion 14 has a ring-shaped positioning protrusion 14a that protrudes in the axial direction in a region of approximately 1/2 in the radial direction on the outer peripheral side.
Region 2 is a recess 14b.

Between the base portion 14 and the hexagonal convex portion 11, the base portion 14
The sleeve positioning recess 15 is slightly smaller in outer diameter than the outer diameter. A hose 20 is inserted from the base portion 14 to the tip side of the nipple 13, and has a tapered taper portion 13a for facilitating the insertion of the hose 20. The inside of the taper portion 13a is closely attached to the hose 20 at a predetermined interval. Four ring-shaped groove portions 13b are provided coaxially to increase the height.

The hose 20 includes an inner resin layer 21, a metal wire reinforcing layer 22, and an outer protective layer 23, which are sequentially laminated from the inside.
Is provided. The inner resin layer 21 is formed by using a material corresponding to a flammable fluid applied to the hose 20, such as a solvent-resistant polyamide resin or an LPG-resistant nitrile rubber.
Those having an inner diameter of 3 to 25 mmφ and a wall thickness of 0.5 to 3.0 mm are used. The metal wire reinforcing layer 22 is
Metal wire such as hard steel wire and stainless wire is woven 1
A layer or multiple layers having a thickness of 0.4 to 5.0 mm are used. The outer protective layer 23 is formed of a resin or rubber material suitable for the usage environment in which a hose is used, such as polyvinyl chloride, polyurethane, polyamide, polyester, and chloroprene rubber, and has an outer diameter of 8 to 3
It has a diameter of 5 mm and a thickness of 0.5 to 3.0 mm. The nipple 13 fitted with the hose 20 has a sleeve-shaped cylindrical member 3 made of iron or stainless steel and having an inner diameter slightly larger than the outer diameter of the hose.
It is covered with 0 and is caulked and fixed.

Next, the formation of the hose connection joint will be described. First, the hose 20 on which the tubular member 30 is externally inserted.
Is externally fitted from the tip of the nipple 13 of the joint 10 and fitted until the tip of the hose 20 comes into contact with the positioning convex portion 14a of the base portion 14. As a result, as shown in FIG. 2, the tip of the metal wire reinforcing layer 22 of the hose 20 causes the positioning protrusion 1 to move.
4a is brought into contact with the base portion 14 to be brought into conduction. Subsequently, the tubular member 30 is put over the entire nipple 13 including the fitted hose 20, and first the tip portion of the tubular member 30 is aligned with the sleeve positioning recess 15 and caulked. Furthermore, by caulking and fixing the entire tubular member 30 to the nipple 13, as shown in FIG.
The hose 20 is firmly fixed to 3.

By crimping the tubular member 30, the tip portion of the hose 20 is rolled, and the inner resin layer 21 and the outer protective layer 23 are largely extended as compared with the metal wire reinforcing layer 22. Here, the lower side of the positioning convex portion 14a provided on the outer peripheral side of the base portion 14 is the concave portion 14b, so that the rolled portion of the inner resin layer 21 extends into the space of the concave portion 14b. In addition, the rolled portion of the outer protective layer 23 is the base portion 14
Between the outer periphery of the cylindrical member 30 and the inner surface of the tubular member 30. Therefore, the metal wire reinforcing layer 22 is pressed against the positioning convex portion 14a without being hindered by the rolled portions of the inner resin layer 21 and the outer protective layer 23, and the conduction state with the positioning convex portion 14a is secured.

As a result, according to the above-mentioned embodiment, the conductive state between the metal wire reinforcing layer 22 and the base portion 14 of the nipple 13 is surely obtained without peeling and removing the outer protective layer 23 at the tip portion of the hose 20. You can get a hose connection fitting. Therefore, the static electricity generated by the contact between the fluid flowing in the hose 20 and the inner resin layer 21 and charged in the metal wire reinforcing layer 22 can be released to the ground wire through the nipple 13 and the joint 10, and the static electricity charged causes the static electricity. It is possible to reliably prevent ignition of surrounding combustible gas due to the generation of sparks, and damage such as hose damage and fluid leakage due to pinholes generated in the resin layer. Further, since the peeling work of the outer protective layer 23 can be omitted, the hose connecting work time can be significantly shortened, so that the manufacturing cost thereof can be reduced.

In the above embodiment, the case where the hose connection joint is used as a joint for a paint coating hose has been described, but the present invention is not limited to this, and a flammable gas or fluid such as LPG or oil is used. It can also be used as a joint for a transportation hose.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view schematically showing a hose connection joint according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a process of forming the joint portion.

FIG. 3 is a partial cross-sectional view schematically showing a joint portion of a conventional example.

FIG. 4 is a partial sectional view schematically showing a joint portion of another conventional example.

[Explanation of symbols]

10 ... Joint, 11 ... Hexagonal convex part, 12 ... Nipple, 12b
... insertion recess, 13 ... nipple, 13a ... taper part, 1
3b ... Groove portion, 14 ... Base portion, 14a ... Positioning convex portion, 14
b ... concave part, 15 ... sleeve positioning concave part, 20 ... hose, 21 ... inner resin layer, 22 ... metal wire reinforcing layer, 23
... outer protective layer, 30 ... tubular member.

Claims (1)

[Claims] 1. A hose insertion tube part externally fitted from the tip by a hose formed by sequentially laminating an inner resin layer, a metal wire reinforcing layer and an outer protection layer, and a hose insertion tube part separated from the tip of the hose insertion tube part. A base protruding in a brim shape at the base of the hose insertion tube, and a positioning projection protruding in a ring shape from a predetermined area on the outer peripheral side in the radial direction of the hose insertion tube toward the tip side of the hose insertion tube. And a tubular member externally fitted to the hose externally inserted in the hose insertion tubular portion for caulking and fixing the hose in contact with the positioning convex portion. Hose connection fitting.