JPH0315902Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a connection structure for connecting a spirally reinforced hose to a target connection port.

(Prior Art) A conventional connection structure for a spirally reinforced hose is to fit a spirally reinforced hose into a hose insertion portion of a hose nipple with a flange formed at the connection end, and to insert a tightening member around the outer periphery of the hose fitting portion. The fitted nut is connected by screwing it into the intended connection port.

In the above connection structure, when the nut to be fitted is screwed into the connection port and tightened, the nut slides in the longitudinal direction of the hose with respect to the hose nipple. As a result, the substantially cylindrical tightening member interposed between the fitted nut and the outer periphery of the hose is narrowed to a small diameter, and the fitting member of the reinforced hose is tightened from the outer periphery to the hose nipple.

However, the spirally reinforced hose has a relatively hard reinforcing wire wound around the hose body in a spiral manner to prevent the hose from collapsing. Therefore, it is resistant to loads acting in the radial direction, and even if the fitting part of the hose is tightened from the outer periphery with a tightening member, the fitting part cannot be brought into strong contact with the outer circumferential surface of the hose insertion part of the hose nipple. However, it could not be said that the retaining function and sealing performance of the connection part were sufficiently ensured.

In addition, since the tightening member is an integrally molded cylindrical member, it is necessary to insert the member into the hose in advance, and the member is attached to the end of the hose whose diameter has expanded by fitting the hose nipple. It is necessary to forcibly push it into place using a tool, etc.
Therefore, the connection work is time-consuming, and there is a risk that the hose may be damaged by the tightening member when the member is pushed in.

(Technical Problem) The technical problem of the present invention is to increase the retaining force and adhesion of the spiral reinforced hose to the outer circumferential surface of the hose insertion part of the hose nipple in the connection structure of the spiral reinforced hose, and to assemble the tightening member. The goal is to make it easy to attach.

(Means for solving the technical problems) The means taken by the present invention to solve the above-mentioned technical problems is to form a concave groove on the circumferential surface of the hose insertion part of the hose nipple with a flange formed at the connection end. A tightening member comprising: a helical reinforcing hose fitted into the hose insertion portion; a plurality of circular arc pieces connected to each other; and a pressing piece protruding from the groove on the inner circumferential surface of the circular arc pieces; is wound around the outer circumferential surface of the fitting part of the spiral hose and tightened, the side edges of the member are welded and joined together, a nut to be fitted is fitted around the outer periphery of the tightening member and the hose nipple, and the nut to be fitted is used for the purpose. It is screwed into the connection port of.

(Function) According to the above means, the fitting portion of the spiral reinforced hose fitted into the hose insertion portion of the hose nipple is crimped against the outer circumferential surface of the hose insertion portion by the tightening force of the tightening member. The portion corresponding to the groove is pushed into and fitted into the groove by the pressing piece of the tightening member, and is strongly pressed against the bottom surface of the groove.

(Effects) Since the present invention is as described above, it produces the effects listed below.

The fitting part of the spiral reinforced hose is pressed against the outer periphery of the hose insertion part of the hose nipple by the tightening force of the tightening member, and in particular, the part corresponding to the groove is strongly pushed into the groove by the pressing piece. Since the hose and groove are crimped together in a fitted state, the connection between the hose and the recessed groove is strong, ensuring that the hose does not come off, and the pressure is increased to improve sealing performance.

The tightening member is wound and tightened around the outer circumference of the spirally reinforced hose fitted to the hose nipple, and the side edges are welded and joined, so when assembling the tightening member, it is not necessary to insert the tightening member into the hose in advance. There is no need to push the assembly into the assembly location using tools, etc., which saves time and effort in the assembly process, and allows for mechanization of the assembly process. Furthermore, there is no risk of the hose being damaged by the tightening member, and the hose can be reliably assembled at the attachment location, thereby improving the workability of the assembly work and the reliability of the product.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

A connection structure A for connecting a spirally reinforced hose a to a target connection port b includes a hose nipple 1 into which the spirally reinforced hose a is fitted, a tightening member 3 wound around the outer periphery of the fitting portion of the spirally reinforced hose a, and a connection port. It is composed of a fitted nut 4 that is screwed into b.

The hose nipple 1 is formed into a cylindrical shape using synthetic resin or the like, and consists of a flange part 1b provided around the connection side edge and a hose insertion part 1a between the flange part 1b and the hose insertion side end. The edge of the insertion port of the hose insertion portion 1a is chamfered, and a groove 2 is provided around the approximate center of the insertion portion 1a.

There are many types of spiral reinforced hoses, but the basic structure is that the reinforcing wire material A ₁ is spirally wound around the hose body and fixed, and the reinforcing wire material A ₁ is wound between the reinforcing wire materials A 1 at a predetermined spiral pitch. Valley _A2 is formed.

To fit the spiral reinforced hose a into the hose insertion part 1a of the hose nipple 1, fit the mouth of the spiral reinforcement hose a into the end of the insertion part 1a, and screw it in until it reaches the base end of the insertion part 1a. Fit together.

The tightening member 3 fitted to the outer periphery of the fitting part of the spiral reinforced hose a is bendably connected to one side of arcuate pieces 3a and 3a' which are curved into semicircular arcs, as shown in FIG. At the same time, a concave groove 3b and a convex piece 3b' that fit into each other are formed along the remaining sides of the same pieces 3a, 3a', and a concave groove 2 on the inner peripheral surface of both arcuate pieces 3a, 3a' is formed. A pressing piece 5 is provided protrudingly at a position corresponding to .

The circumferential length of the tightening member 3 is set so that the concave groove 3b and the convex piece 3b' of the tightening member 3 fit together when the tightening member 3 is wound around the outer periphery of the fitting portion of the spiral reinforced hose a and tightened. Further, the pressing piece 5 is formed to have a width and a height such that it fits into the groove 2 through a gap corresponding to the wall thickness of the spirally reinforced hose a.

After aligning the tightening member 3 to the outer periphery of the fitting part of the spiral reinforced hose a, winding it and tightening it, and fitting the concave groove 3b, the convex groove 3b, and the convex piece 3b', the sides in the abutting state The sides are thermally welded and joined using heat generated by ultrasonic vibration. By tightening the cylindrically joined tightening member 3, the fitting portion of the spirally reinforced hose a is tightened from the outer periphery and is crimped against the outer periphery of the hose insertion portion 1a.

Particularly, the portion of the helical reinforced hose a fitting portion corresponding to the groove 2 is pushed into the groove 2 from the outer periphery by the pressing piece 5, and is firmly pressed into the groove 2 and the bottom surface.

Therefore, since the concave groove 2 and the fitting part of the spirally reinforced hose a are strongly connected, it is possible to ensure that the hose a does not come off, and the pressing piece 5 allows the spirally reinforced hose a to be
Since the pressure force is increased, the sealing performance can also be improved.

The tightening member 3 is constructed by bendably connecting a plurality of arcuate pieces, and the number of arcuate pieces may be three or more than four.

The nut 4 to be fitted, which has been fitted in advance to the spirally reinforced hose a side, is slid onto the outer periphery of the hose nipple 1 and the tightening member 3, and the connection side end thereof is screwed into the connection port b and tightened. .

As a result, the fitted nut 4, the spiral reinforced hose a
The hooking portion 4a at the side end is hooked to the end face of the tightening member 3, and pushes the tightening member 3 and the hose nipple 1 toward the connection port b. Therefore, the collar part 1 of the nipple 1
b is pressed against the connection port b through the packing 6, and the connection port b and the hose nipple 1 are connected while maintaining sealing properties.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a connection structure implementing the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1,
FIG. 3 is an exploded perspective view of the hose, hose nipple, and tightening member. In the figure, A... Connection structure, a... Spiral reinforced hose, b... Connection port, 1... Hose nipple, 1a
... Hose insertion part, 1b ... Flange part, 2 ... Concave groove,
3... Tightening member, 4... Fitted nut, 5... Pressing piece.

Claims (1)

[Scope of utility model registration request] A concave groove is provided on the circumferential surface of the hose insertion part of the hose nipple with a flange formed on the connection side end, a spiral reinforced hose is fitted into the hose insertion part, and a plurality of arcuate pieces are connected to form these arcuate grooves. A tightening member formed by forming a pressing piece protruding with respect to the groove on the inner circumferential surface of one piece is wound around the outer circumferential surface of the fitting part of the spiral hose and tightened, and the side edges of the member are welded and joined, A connection structure for a spiral reinforced hose, in which a fitting nut is fitted around the outer periphery of the tightening member and the hose nipple, and the fitting nut is screwed into a target connection port.