JP2007051774A - Water supply/hot water supply hose fitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fitting structure capable of securing fitting pull-out force and sealing performance on a high level even when a hose inner surface layer is formed of a comparatively hard resin layer. <P>SOLUTION: A hose fitting comprises a nipple 11 inserted inside a water supply/hot water supply hose, and a fastening implement disposed on the outer peripheral side at an overlap part of the nipple and the hose and fastened along an axis direction and a circumferential direction from the outer peripheral side. Four to twelve circumferential groove parts 12 are formed on the outer peripheral surface of the nipple, and the width ratio of projecting parts 13 to recessed parts 14 forming the circumferential groove parts is 1:1-3. Further, an O-ring groove part 12a is formed on the outer peripheral surface of the nipple, and an O-ring 21 is disposed in the ring groove part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mouthpiece structure of a hose (hereinafter, represented by a water supply hose) used for a faucet fitting for a kitchen or a wash basin, a water storage tank of a toilet, and other water supply or hot water supply pipes.

  Conventionally, as a shape of a hose fitting, as shown in FIG. 1, generally, the nipple has 2 to 4 bamboo-like protrusions a having a taper toward the inside of the hose. When a soft material such as rubber, PVC, or a thermoplastic elastomer is used for the inner surface layer of the hose 20, the insertability of the fitting and the pulling force and sealing performance of the fitting can be secured at a high level. In the figure, reference numeral 1 denotes a nipple, on which two bamboo-like protrusions a having a taper are formed on the outer peripheral surface. The tip of the nipple 1 has a tapered surface 1a so that the hose can be easily inserted. Reference numeral 2 denotes a metal fastener for a cylindrical sleeve member.

  However, in recent years, the material of the inner surface layer of the hose has changed due to market demands and hard materials such as cross-linked polyethylene and polybutene have been used. However, since the hose is difficult to spread in the radial direction, it cannot overcome the protrusion. The insertability of metal fittings was extremely deteriorated.

  In view of this, a structure in which a plurality of circumferential groove portions b are provided in the nipple as shown in FIG. 2 instead of the protrusions has been considered. However, the resin forming the inner surface layer is hard, and the resin of the inner surface layer is not affected by caulking with the sleeve. The necessary pulling force could not be obtained because the peripheral groove b was not pulled. Further, sufficient sealability could not be secured. FIG. 2 shows a state in which the fastener 2 is crimped, but the resin of the inner surface layer does not fully enter the circumferential groove b, resulting in an insufficient state.

  Accordingly, there is a structure in which the convex portions generated between the circumferential groove portions are rounded into a semi-cylindrical shape c in the nipple as shown in FIG. 3 so that the resin can easily enter the circumferential groove portions. This provides a certain pulling force and has been used in practice. However, in recent years, when a higher pulling force is demanded from the market, the rounded portion of the kamaboko shape causes the resin to slide, and if the sleeve is tightened more strongly, the fitting is crushed, resulting in a higher pulling force. Could not get. In the figure, 21 is an O-ring.

  The present invention has been made in view of the above prior art, and in particular, even when the hose inner surface layer is constituted by a relatively hard resin layer, the pull-out force and sealing performance of the fitting are secured at a high level. An object of the present invention is to provide a cap structure that can be used.

  The gist of the present invention is that a nipple inserted inside a water supply / hot water supply hose and a portion where the nipple and the hose overlap are arranged on the outer peripheral side of the hose, and caulked from the outer peripheral side along the axial direction and the circumferential direction. A plurality of circumferential groove portions are formed on the outer peripheral surface of the nipple, and the ratio of the widths of the convex portions and the concave portions forming the circumferential groove portions is 1: 1 to 3. This is a hose fitting structure for water supply and hot water supply.

  More specifically, a preferred example of the present invention will be described. A nipple inserted inside the water / hot water supply hose, and a portion where the nipple and the hose overlap each other are arranged on the outer peripheral side of the hose. A hose fitting provided with a fastener that is crimped along the circumferential direction, wherein four to twelve circumferential groove portions are formed on the outer peripheral surface of the nipple, and a convex portion that forms the circumferential groove portion; The ratio of the widths of the recesses is 1: 1 to 3, further, an O-ring groove is formed on the outer peripheral surface of the nipple, and an O-ring is provided in the O-ring groove. It is a bracket structure.

  By using the metal fitting according to the present invention, even if the hose has an inner surface layer formed of a relatively hard resin layer, the pulling force and the sealing performance can be secured at a high level, and the effect is extremely great.

  The fitting of the present invention has a plurality of (preferably 4 to 12) circumferential groove portions arranged on the outer peripheral surface of the nipple into which the hose is inserted, and increases the number of locations where the inner surface layer is caught compared to the bamboo shoot shape. In the kamaboko shape, the width of the concave portion narrower than the convex portion is set to be 1 to 3 times that of the convex portion. A plurality of such circumferential groove portions are provided, but preferably 4 to 12 locations, and if there are less than 4 locations, there are few locations where the inner surface layer is caught, which may not be sufficient when a large pulling force is required, On the other hand, if the number is more than 12, the width of the convex portion becomes narrow, so that sufficient strength of the convex portion may not be obtained.

  In addition, by expanding the width of the circumferential groove portion from the convex portion, the inner surface layer can sufficiently enter the circumferential groove portion even when a hard resin such as crosslinked polyethylene, polybutene, or fluorine-based resin is used for the inner surface layer. It becomes caught in the groove part, and the improvement of the pulling-out force and further the sealing performance is recognized. The ratio of the width of the convex portion to the concave portion of the circumferential groove portion is normally 1.4 to 1.8 times that of the concave portion with respect to the convex portion 1, but 1.7 when the resin of the inner surface layer tube is hard. ~ 2 times is optimal.

  As a preferable shape of the convex portion, it is preferable that a flat portion is provided on the upper surface of the convex portion instead of a semi-cylindrical shape, and the corner portion is not a right angle but a curved surface. It is desirable that the curved surface R be R0.1 to R0.6 mm, particularly R0.2 to R0.3 mm. If the curved surface R is not provided at the corner, the inner surface layer is cut by the corner before the fitting is removed when a pulling force is applied to the fitting, and a sufficient pulling force cannot be obtained. On the other hand, if the curved surface R is large, the inner surface layer slips without being caught by the convex portion, and also a sufficient pulling force cannot be obtained.

  Further, if the convex portion is provided with a taper of 0 to 10 degrees and the convex portion is trapezoidal, the inner surface layer easily enters the circumferential groove portion, so that a higher pulling force can be obtained. The taper angle is desirably up to 5 degrees. On the other hand, when the angle exceeds 10 degrees, the tip of the convex portion becomes thin, so that the inner layer of the hose cannot be cut or the strength of the convex portion cannot be obtained.

  The material of the fitting including the nipple is preferably brass, bronze, or brass, and stainless steel is also applicable. The fastener is preferably a metal and cylindrical sleeve member, and it is usually desirable that the material be stainless steel, which is less susceptible to rust.

  When the peripheral groove portion of the main shape is arranged in the nipple, sufficient sealing performance can be obtained by the resin of the inner surface layer entering the peripheral groove portion, but in order to prevent leakage due to a decrease in elasticity due to aging of the resin of the inner surface layer, It is recommended that an O-ring groove is formed on the outer peripheral surface of the metal fitting and a rubber O-ring is provided.

  Further, it is possible to dispose a protrusion larger in the outer diameter direction one step than the convex portion at a position where it abuts against the hose end portion of the metal fitting, and to squeeze the sleeve end portion bent inward in advance to the protrusion. As a result, the sleeve hooked on the projection of the metal fitting cannot be easily removed, so that a higher pulling force can be obtained.

Hereinafter, the present invention will be described in more detail with reference to examples.
FIG. 4 is a half-cut cross-sectional view of the first example of the fitting of the present invention, and FIG. 5 is an enlarged cross-sectional view of the main part in FIG. In the figure, reference numeral 11 denotes a nipple, which is an example in which a plurality of circumferential groove portions 12 are formed on the outer circumferential surface thereof. The projection 13 and the depression 14 forming the circumferential groove 12 are formed at six locations. A specific curved surface R is formed at the ratio of the widths 13W and 14W of the recesses 14 and the corners of the projections 13. 20 is a water supply hose, and polybutene is used for the inner peripheral layer.

  Note that a projection 16 that is larger in the outer diameter direction than the convex portion 13 is disposed at the deepest portion of the nipple 11, that is, a position that contacts the hose end 20 a, and a fastener 16 that is bent inward to the projection 15 in advance. The hose is fixed to the nipple 11 by crimping along the axial direction and the circumferential direction in a state where the sleeve end is hooked.

  In the present invention, the relationship between the convex portion 13 and the concave portion 14 forming the circumferential groove portion 12 is specified. The ratio of the width 13W of the convex portion 13 to the width 14W of the concave portion 14 is 13W: 14W = 1: 1. It is set to 5.

  And the convex part 13 has a plane parallel to an axial direction on the upper surface, and the curvature R of the curved surface formed in the corner | angular part of the convex part 13 is R0.3 mm. Further, the surface connecting the flat surface of the upper surface of the convex portion 13 and the concave portion 14 is configured with an angle θ of 5 degrees.

  FIG. 6 is a half-cut sectional view of a second example of the fitting of the present invention. In the second example of the present invention, an O-ring groove portion 12 is formed on the outer peripheral surface of the nipple 11 and an O-ring 21 is disposed in the O-ring groove portion 12 in the fitting of the first example. That is, two O-ring grooves 12 a are formed on the outer peripheral surface of the nipple 11.

  The fitting of the present invention ensures a high level of pull-out force and sealing performance of the fitting, even though it is used for a hose that uses a hard material such as cross-linked polyethylene, polybutene, or fluorine-based resin for the inner layer. Thus, it can be used not only for water supply but also for hot water supply, and its application is very wide.

FIG. 1 is a half cut sectional view showing an example of a conventional fitting. FIG. 2 is a half-cut sectional view showing another example of a conventional fitting. FIG. 3 is a half-cut sectional view showing still another example of the conventional fitting. FIG. 4 is a half-cut sectional view showing an example of the first example of the fitting of the present invention. FIG. 5 is a partially enlarged cross-sectional view of the main part of the fitting of the first example of the present invention. FIG. 6 is a half-cut sectional view showing an example of the fitting of the second example of the present invention.

Explanation of symbols

11 Nipple,
12. Circumferential groove,
12a ... O-ring groove,
13 ... convex part,
14 ... recess,
13W ... Width of convex part,
14W ... the width of the recess,
15 ... projection,
16 ... Fasteners
20 ... hose,
20a ... hose end,
21 ... O-ring,
R is the curvature of the corner of the convex part,
θ is the angle of the surface connecting the upper surface of the convex part and the concave part.

Claims (11)

  A nipple inserted inside the hose for water supply and hot water supply, and a fastener that is arranged on the outer peripheral side of the hose at a portion where the nipple overlaps with the hose and is crimped from the outer peripheral side along the axial direction and the circumferential direction. A plurality of circumferential groove portions are formed on the outer peripheral surface of the nipple, and the ratio of the widths of the convex portions and the concave portions forming the circumferential groove portions is 1: 1 to 3. Hose fittings for water and hot water supply.   The water / hot water supply hose fitting structure according to claim 1, wherein the material of the fitting is brass, bronze or stainless steel.   The water supply / hot water supply hose fitting according to claim 1 or 2, wherein the convex portion has a flat surface parallel to the axial direction on an upper surface, and R of a curved surface of the corner portion is R0.1 to R0.6 mm.   The water supply / hot water supply hose fitting structure according to any one of claims 1 to 3, wherein the convex portion has a taper shape in which a surface connecting the flat surface of the upper surface and the concave portion is 0 to 10 degrees.   The hose fitting structure for water / hot water supply according to any one of claims 1 to 4, wherein the material of the fastener is stainless steel.   The water supply / hot water supply hose fitting structure according to any one of claims 1 to 5, wherein the fastener is a cylindrical sleeve member made of metal.   2. The water / hot water hose fitting structure according to claim 1, wherein there are 4 to 12 circumferential grooves formed on the outer peripheral surface of the nipple.   8. The water / hot water supply hose fitting according to claim 1, wherein an O-ring groove is formed on an outer peripheral surface of the nipple, and an O-ring is disposed in the O-ring groove.   In addition to the O-ring groove portion of the nipple, a state where a larger protrusion is arranged in the outer diameter direction one step further than the convex portion at a position in contact with the hose end portion, and a sleeve end portion bent inward is hooked on the protrusion in advance. The water supply / hot water supply hose opening metal fitting structure according to claim 8, wherein the fastener is swaged.   The water supply / hot water supply hose fitting structure according to any one of claims 1 to 9, wherein the inner layer tube of the water supply hose is a single layer or a plurality of layers of cross-linked polyethylene, polybutene, and fluorine resin.   A nipple inserted inside the hose for water supply and hot water supply, and a fastener that is arranged on the outer peripheral side of the hose at a portion where the nipple overlaps with the hose and is crimped from the outer peripheral side along the axial direction and the circumferential direction. 4-12 circumferential groove portions are formed on the outer peripheral surface of the nipple, and the ratio of the width of the convex portion to the concave portion forming the peripheral groove portion is 1: 1 to 3. And a water supply / hot water supply hose fitting structure, wherein an O-ring groove is formed on the outer peripheral surface of the nipple, and an O-ring is disposed in the O-ring groove.

Images