JP3111817U - Flexible hose and its fittings - Google Patents

Abstract

An object of the present invention is to provide a hermetic seal between a corrugated tube wall and a mandrel of a fitting that is inserted from the end of the corrugated tube, even if the corrugated tube wall that is the main body of the flexible hose is formed of a spiral hook. At the same time, the core part of the fitting fitting inserted from the pipe end of the corrugated pipe is prevented from coming off.
A corrugated tube 1 serving as a hose body has a tube wall formed of a spiral ridge 4 and a fitting 2 attached to the tube end of the corrugated tube 1 is inserted from the tube end of the corrugated tube 1. A male screw 7 is formed on the outer periphery of the mandrel 3 to be screwed with the spiral flange 4 forming the tube wall of the corrugated tube 1, and the mandrel 3 is inserted by being screwed in from the tube end of the corrugated tube 1. .
[Selection] Figure 1

Description

The present invention relates to a flexible hose and its fittings used as various pipes or pipe joints, and more particularly to a flexible hose in which a corrugated pipe serving as a hose body is formed of a flexible synthetic resin and its fittings.

In this type of flexible hose, for example, as shown in FIG. 2, a corrugated tube 11 serving as a hose body is formed of a flexible synthetic resin such as a fluororesin or a silicone resin, A fitting 12 having a mandrel 13 inserted from the end of the pipe is attached. The tube wall of the corrugated tube 11 is formed with ridges 14 in which annular recesses 14a and annular projections 14b are alternately formed at a constant pitch when viewed from the inside of the tube, as shown in the cross section shown in FIG. The reinforcing cloth 15 is attached so as to be in close contact with the outer peripheral surface, and the outer periphery thereof is covered with a stainless steel mesh blade 16 braided into a cylindrical shape with a stainless steel wire (see Patent Document 1).
JP-A-10-26266

The metal core portion 13 of the joint fitting 12 is formed in a tapered shape whose outer diameter gradually increases from the front end portion side to the rear end portion side to be inserted into the tube end of the corrugated tube 11, and the flange 14 within the corrugated tube 11. A plurality of annular ribs 17 that are locked to the convex portions 14b and are used as return pins for retaining are formed at a constant pitch along the outer peripheral surface.

Then, the fitting 12 is attached by pushing the distal end side of the mandrel 13 toward the tube end of the corrugated tube 11 as shown in FIG. 2 (a) and pushing the tube end into the tube as shown in FIG. 2 (b). By doing so, the convex part 14b of the flange 14 forming the tube wall of the corrugated pipe 11 and the outer peripheral surface of the mandrel part 13 of the joint metal fitting 12 are in pressure contact with each other, and the outer periphery of the mandrel part 13 The surface of the corrugated tube 11 and the tube wall of the corrugated tube 11 are hermetically sealed, and at the same time, the annular rib 17 formed on the outer peripheral surface of the mandrel 13 is engaged with the convex portion 14b of the flange 14 of the corrugated tube 11. The mandrel 13 of the joint fitting 12 is prevented from coming out of the tube end of the corrugated tube 11.

The above is the structure of the conventional flexible hose and its fittings shown in FIG. 2, but some recent flexible hoses have a corrugated pipe wall as a main body formed of a spiral ridge. Further, a corrugated tube whose tube wall is formed of a spiral ridge is also used as a joint fitting to be attached to the end of the tube, as shown in FIG. A conventional fitting 21 having an annular rib 26 is used.

However, when the corrugated tube wall is formed of a spiral ridge, the convex portion of the wall rides on the annular rib 17 formed on the outer peripheral surface of the mandrel 13 of the joint fitting 12 and the mandrel. Since it cannot adhere to the outer peripheral surface of the portion 13, the space between the outer peripheral surface of the mandrel 13 and the tube wall of the corrugated tube 11 cannot be hermetically sealed. There was a problem that it was easy to come out of the 11 tube ends.

Even if the wall of the corrugated pipe that is the hose body is formed with a spiral ridge, the present invention provides an airtight connection between the wall of the corrugated pipe and the mandrel of the fitting fitting inserted from the pipe end. At the same time, it is a technical subject to prevent the metal core part of the joint fitting inserted from the pipe end of the corrugated pipe from being removed.

In order to solve the above-mentioned problems, the invention of claim 1 is such that a corrugated tube as a hose body is formed of a synthetic resin having flexibility, and a mandrel portion is inserted into the corrugated tube end from the tube end. In the flexible hose to which the fitting is attached, the tube wall of the corrugated pipe is formed with a spiral ridge, and a male screw that is screwed with the spiral ridge is formed on the outer periphery of the mandrel portion of the fitting The mandrel is inserted by screwing from the end of the corrugated tube.

Further, the invention of claim 4 is a joint fitting for a flexible hose in which a tube wall of a corrugated tube serving as a hose body is formed of a spiral hook, and an outer periphery of a mandrel portion inserted from a tube end of the corrugated tube In addition, a male screw that is screwed with the spiral hook is formed, and the male screw is formed into a round screw having a circular cross section of the screw thread.

According to the present invention, the mandrel part of the joint fitting in which the external thread is formed on the outer periphery of the corrugated tube that forms the tube wall of the corrugated tube from the tube end of the corrugated tube that is the hose body of the flexible hose. By screwing and inserting, it is possible to hermetically seal between the tube wall of the corrugated pipe and the core part of the fitting fitting inserted from the pipe end, and at the same time, the joint inserted from the pipe end of the corrugated pipe There is an excellent effect that the metal core part of the metal fitting can be prevented from coming off.

In the best embodiment of the flexible hose according to the present invention, a corrugated tube as a hose body is formed of a synthetic resin such as a flexible fluororesin or silicon resin, and the outer periphery thereof is covered with a stainless mesh blade. At the same time, the tube wall of the corrugated tube is formed of a spiral ridge, and a fitting fitting in which a mandrel portion is inserted from the tube end is attached to the tube end of the corrugated tube. Further, the joint fitting is formed with a male screw threadedly engaged with a spiral hook forming the tube wall of the corrugated tube on the outer periphery of the mandrel portion inserted from the tube end of the corrugated tube. Screwed in from the tube end. Thereby, the space between the pipe wall of the corrugated pipe and the mandrel of the fitting inserted from the pipe end is hermetically sealed, and at the same time, the mandrel of the fitting fitting inserted from the pipe end of the corrugated pipe It is prevented from coming off from the pipe end.

In the joint fitting, a male screw formed on the outer periphery of the mandrel is formed as a round screw having a circular cross section of the thread. As a result, when the mandrel part of the joint metal fitting is screwed from the pipe end of the corrugated pipe and inserted, the pipe wall of the corrugated pipe formed by the spiral ridge is damaged by the male screw formed on the outer periphery of the mandrel part. There is no fear.

FIG. 1 is a view showing an example of a flexible hose and its fittings according to the present invention. FIG. 1 (a) shows a state before inserting the core part 3 of the fitting 2 from the pipe end of the corrugated pipe 1. FIG. FIG. 2B shows a state in which the mandrel 3 of the fitting 2 is inserted.

In the flexible hose of this example, the corrugated tube 1 serving as the hose body is formed of a synthetic resin such as flexible fluororesin or silicon resin, and the reinforcing cloth 5 is attached so as to be in close contact with the outer peripheral surface thereof. Further, the outer periphery thereof is covered with a stainless mesh blade 6 braided into a cylindrical shape with a stainless steel wire. The corrugated tube 1 has a spiral wall 4 formed on the tube wall. That is, the concave portion 4a and the convex portion 4b of the flange 4 are formed in a spiral shape when viewed from the inside of the corrugated tube 1.

On the other hand, the fitting 2 attached to the tube end of the corrugated tube 1 is screwed onto the outer periphery of the mandrel portion 3 inserted from the tube end of the corrugated tube 1 with the spiral flange 4 constituting the tube wall of the corrugated tube 1. A male screw 7 is formed, and the mandrel part 3 is inserted by being screwed from the tube end of the corrugated tube 1. Thereby, the space between the tube wall of the corrugated tube 1 and the mandrel 3 of the fitting 2 inserted from the tube end of the corrugated tube 1 is hermetically sealed, and at the same time, from the tube end of the corrugated tube 1 into the tube. The core metal part 3 of the inserted fitting 2 is reliably prevented from coming off from the pipe end.

Further, the male screw 7 formed on the mandrel part 3 of the joint fitting 2 is formed by a round screw having a circular cross section of the thread, so that the mandrel part 3 of the fitting 2 is used as the tube of the corrugated tube 1. There is no fear of damaging the tube wall of the corrugated tube 1 formed by the spiral flange 4 by the male screw 7 formed on the outer periphery of the mandrel 3 when screwed from the end, and the tube wall and the fitting 2 The sealing performance with the mandrel 3 is maintained well.

In addition, although the coupling metal fitting 2 is a union coupling which connects a pipe | tube and a pipe with the male screws 7 and 9 formed in the both sides by turning the union nut 8, the coupling metal fitting which concerns on this invention is restricted to this. Instead, it is sufficient if the male screw 7 is formed on the mandrel 3 inserted from the tube end of the corrugated tube 1.

The figure which shows an example of the flexible hose which concerns on this invention, and its coupling metal fittings The figure which illustrates the joint bracket of the conventional flexible hose

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Corrugated pipe 2 Joint metal fitting 3 Mandrel part 4 Spiral rod 6 Stainless steel mesh blade 7 Male thread

Claims (4)

In a flexible hose in which a corrugated tube that is a hose body is molded of a synthetic resin having flexibility, and a fitting fitting in which a mandrel portion is inserted from the tube end is attached to the end of the corrugated officer, A tube wall is formed with a spiral ridge, and a male screw is formed on the outer periphery of the metal core portion of the joint fitting to be screwed with the helical ridge, and the metal core portion is formed from the tube end of the corrugated tube. A flexible hose which is inserted by screwing. The flexible hose according to claim 1, wherein the male screw formed on the outer periphery of the mandrel portion of the fitting is a round screw having a circular cross section of the thread. The flexible hose according to claim 1 or 2, wherein an outer periphery of the corrugated tube is covered with a stainless mesh blade braided into a cylindrical shape with a stainless steel wire. A flexible hose joint fitting having a corrugated pipe wall which is a hose body formed of a spiral hook, and the outer surface of the core part inserted from the pipe end of the corrugated pipe, A joint fitting, wherein a male screw is formed, and the male screw is formed into a round screw having a circular cross section of the thread.

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