JP2008151196A - Fitting, and hose fitting caulking method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent fluid leakage without damaging O-rings and a hose even though a sleeve is tightly caulked, in a fitting provided with a nipple having a seal member, and the sleeve caulking the hose. <P>SOLUTION: This fitting 10 is so caulked that the O-ring 52 as a first seal member arranged on the peripheral wall of a hose connection part 22 is positioned between recessed parts 16 axially arranged on the inner peripheral wall of the sleeve 12. Further, the O-ring 54 as a second seal member is circumferentially arranged on the peripheral wall of an abutting part 42. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fitting and a method for crimping a hose fitting.

When connecting the hose to a device body such as a compressor, a fitting is used as a joint.
The nipple of the metal fitting includes a hose connection part into which a hose is inserted and a cylinder part connected to the apparatus main body. An O-ring is attached to the outer peripheral wall of the tip of the hose connection part, and fluid (liquid, gas) does not leak from the gap between the hose connection part and the hose by crimping the sleeve externally attached to the hose from the outside. (For example, refer to Patent Document 1).

By the way, when caulking the sleeve, depending on the position of the O-ring, the O-ring may be damaged by a ring-shaped convex portion protruding from the inner peripheral wall of the sleeve.
Further, when the fluid flowing through the hose is at a low pressure, it is not necessary to strongly crimp the sleeve. However, when the fluid flowing through the hose is at a very high pressure, the sleeve must be strongly crimped to prevent fluid leakage. At this time, the hose inner surface layer may be damaged at the corners of the O-ring or the ring groove due to the caulking force, and the sealing effect cannot be maintained due to the damage of the O-ring or the hose inner surface layer.
Japanese Patent Laid-Open No. 9-100100

  In view of the above facts, an object of the present invention is to prevent fluid leakage without damaging the seal member or the hose inner surface layer even if the sleeve is strongly caulked.

  The invention according to claim 1 is a nipple comprising a hollow hose connection part into which a hose is inserted at one end, a cylinder part communicating with the hose connection part at the other end, and an outer peripheral wall of the hose connection part A plurality of ring-shaped convex portions are formed on the inner peripheral wall in the axial direction, a sleeve for crimping the hose inserted into the hose connection portion, and the sleeve is crimped And an annular first seal member that is located between the convex portions and seals a gap between the outer peripheral wall of the hose connecting portion and the inner peripheral surface of the hose.

According to the first aspect of the present invention, the inner peripheral surface of the hose bites into the step portion of the hose connection portion and is sealed by crimping the sleeve to the hose, thereby preventing fluid from leaking between the hose connection portion and the hose. it can. Further, when the sleeve is crimped to the hose, the first seal member is located between the convex portions so that the ring-shaped convex portion of the sleeve does not hit the first seal member.
For this reason, even if the sleeve is caulked strongly, the first seal member is not damaged by the convex portion, and fluid leakage can be prevented. In this way, by strongly caulking the sleeve to ensure high sealing performance, it is difficult for fluid to leak from between the hose connection portion and the hose even when a so-called ultra-high pressure fluid flows through the hose.
The first seal member is not particularly limited as long as it can prevent fluid leakage from between the hose and the hose connection portion.

  According to a second aspect of the present invention, an abutting portion is formed between the hose connecting portion and the cylindrical portion, the abutting portion having a diameter larger than that of the hose connecting portion and abutting the tip end portion of the hose. , And provided between the first convex portion and the second convex portion as counted from the abutting portion side.

In the invention according to claim 2, the first seal member is provided between the first convex portion and the second convex portion as counted from the abutting portion side where the tip of the hose inserted into the hose connecting portion abuts. Is provided.
Usually, the crimping force is larger at the tip of the hose connecting portion than the abutting portion side, and the first sealing member may damage the inner surface layer of the hose due to the crimping force. Therefore, by providing the first seal member between the first and second protrusions counted from the abutment side, damage to the inner surface layer of the hose and the first seal member can be prevented. It is possible to prevent fluid from leaking between the connecting portion and the hose.

  According to a third aspect of the present invention, when the sleeve is crimped to the outer peripheral wall of the abutting portion, the second annular ring that seals the gap between the outer peripheral wall of the abutting portion and the inner peripheral wall of the sleeve. A seal member is provided.

  In the invention according to claim 3, since the annular second seal member is provided on the outer peripheral wall of the abutting portion, when the sleeve is crimped, the outer peripheral wall of the abutting portion and the inner peripheral wall of the sleeve Can be sealed. As a result, it is possible to prevent water from entering the inside of the mouthpiece portion from the outside of the mouthpiece through the sleeve and the abutting portion. In particular, when a metal wire layer is used for the hose, it is possible to effectively prevent the metal wire layer from being rusted by infiltrated water, which is suitable for outdoor use of the hose.

  The invention according to claim 4 is characterized in that the first seal member is an O-ring mounted in a ring groove formed in an outer peripheral wall of the hose connection portion.

In the invention described in claim 4, O-rings are used as the first seal members, and are respectively mounted in ring grooves formed on the outer peripheral wall of the hose connection portion.
Since the O-ring is a general-purpose product and has high sealing performance, it is preferably used as a sealing member.

  The invention according to claim 5 is characterized in that the second seal member is an O-ring mounted in a ring groove formed in an outer peripheral wall of the abutting portion.

In the invention described in claim 5, the O-ring is used as the second seal member and is mounted in a ring groove formed in the outer peripheral wall of the abutting portion.
Since the O-ring is a general-purpose product and has high sealing performance, a sealing effect can be exhibited even in a portion having a small outer peripheral surface width such as an abutting portion.

  The invention according to claim 6 is characterized by using the fitting according to claims 1 to 5 and caulking the sleeve so that the first seal member is located between the convex portions. To do.

The invention according to claim 6 is characterized in that the cap metal fitting according to any one of claims 1 to 5 is used and the sleeve is crimped so that the first seal member is located between the convex portions.
In this way, the hose is swaged using the fitting formed so that the inner peripheral surface of the seal member and the hose is not damaged, and therefore, between the hose and the hose connection portion swaged by the swaged method of the above configuration. Fluid can be made difficult to leak.

  Since the present invention has the above configuration, even if the sleeve is strongly caulked, the seal member and the hose inner surface layer are not damaged, and fluid leakage can be prevented.

  Hereinafter, the metal fitting 10 which concerns on 1st Embodiment of this invention is demonstrated based on drawing.

  1A shows a sleeve 12 of the fitting 10 according to the first embodiment, and FIG. 1B shows a nipple 14 of the fitting 10 according to the first embodiment as a partially sectional side view. Show. FIG. 2 shows the fitting 10 according to the first embodiment of the present invention, and shows a state in which the O-rings 52 and 54 are attached to the nipple 14 and the sleeve 12 is fitted.

  As shown in FIG. 1A, the sleeve 12 used in the first embodiment is cylindrical. A plurality of ring-shaped convex portions 16 are formed in the axial direction on the inner peripheral wall, and the interval between the convex portions 16 and the convex portions 16 is set so that the O-ring 52 attached to the ring groove 56 fits between the convex portions 16. Some are wider. One end of the sleeve 12 is thick, and is a locking portion 18 that fits into the recess 20 of the nipple 14.

  As shown in FIG. 1B, the nipple 14 used in the present embodiment has a cylindrical shape, and has a hollow hose connection portion 22 for connecting a hose at one end. As shown in FIG. 3, the hose 44 is connected to the hose connection portion 22 so that the inner surface layer 46 of the hose 44 is in contact with the outer peripheral wall of the hose connection portion 22. A plurality of step portions 24 are formed on the outer peripheral wall of the hose connection portion 22 in the circumferential direction. The step portion 24 includes a tapered surface inclined in the insertion direction of the hose 44, and the step surface is substantially perpendicular to the axis of the hose connection portion 22. Thereby, the hose connection part 22 has a shape in which the hose 44 is easily connected and the hose 44 is difficult to be pulled out.

  On the other hand, the other end of the nipple 14 is provided with a cylinder portion 26 communicating with the hose connection portion 22. Between the cylinder part 26 and the hose connection part 22, a fixed hexagon part 30 for hanging a spanner on the cylinder part 26 and an abutting part 42 against which the hose tip 40 abuts when the hose 44 is connected to the hose connection part 22. And are provided. As shown in FIG. 2, the engaging portion 18 of the sleeve 12 is fitted between the recessed portion 20 by being crimped between the fixed hexagonal portion 30 and the abutting portion 42. The abutting portion 42 has a larger diameter than the hose connection portion 22, and the fixed hexagonal portion 30 has a larger diameter than the abutting portion 42.

  As shown in FIG. 1B, two ring grooves 56 for attaching an O-ring 52 as a first seal member are formed on the outer peripheral wall of the hose connecting portion 22. The ring groove 56 is designed at a position where the O-ring 52 does not hit the convex portion 16 when it is extrapolated until the sleeve 12 hits the fixed hexagonal portion 30. This is to prevent the O-ring 52 from being hit by the convex portion 16 or the O-ring 52 from being broken when the O-ring 52 hits the convex portion 16 during caulking. Therefore, as shown in FIG. 3, when the sleeve 12 is caulked, the O-ring 52 is positioned between the convex portions 16a and 16b.

  If the O-ring 52 can prevent fluid leakage, it may be one or three or more, but if two O-rings 52 are used as in this embodiment shown in FIG. The structure of the metal fitting 10 is not complicated, and high sealing performance can be obtained.

Further, a ring groove 58 for forming the O-ring 54 of the second seal member is formed on the outer peripheral wall of the abutting portion 42. The abutment portion 42 is indirectly reduced in diameter by the caulking device (not shown) by caulking the locking portion 18 and caulking the hose 44, and as shown in FIG. The sleeve 12 is in close contact with each other, and the gap between the sleeve 12 and the abutting portion 42 is sealed.
Thereby, even if the hose 44 is provided with the metal wire layer 48, it is possible to prevent the wire layer 48 from being corroded by the water that has entered from between the locking portion 18 and the recess 20.

  In the present embodiment, the O-rings 52 and 54 are used for the first seal member and the second seal member. However, the seal member may not be O-shaped as long as the sealability can be obtained. Good.

Next, the function of the metal fitting 10 which is 1st Embodiment of this invention is demonstrated.
FIG. 3 shows a state where the sleeve 12 is externally fitted to the nipple 14 to which the O-rings 52 and 54 are attached, and the hose 44 is connected.

  The configuration of the hose 44 is not limited as long as it can withstand the fluid pressure of the fluid used. However, considering prevention of leakage of the fluid flowing through the hose 44, the hose 44 includes an inner surface layer 46 and a wire layer that reinforces the inner surface layer 46 in order to improve the adhesion between the sleeve 12 and the hose 44 and between the hose 44 and the nipple 14. 48 and an outer surface layer 50 covering the outer surface of the wire layer 48 are preferable.

Here, the material of the inner surface layer 46 and the outer surface layer 50 is not particularly limited as long as it is a resin, and may be appropriately selected according to the use, but is preferably a thermoplastic resin, more preferably nylon 11 (PA11 ), Nylon 12 (PA12), ethylene-vinyl alcohol copolymer resin (EVOH), or polybutylene naphthalate resin (PBN).
For example, when using an ultra high pressure hose as the hose 44, PA11 or PA12 is preferably used from the viewpoint of sealing the gap between the hose connection portion 22 and the hose inner surface layer 46, and from the viewpoint of suppressing the permeation of gas flowing through the hose 44. EVOH or PBN is preferably used.

  Further, the wire layer 48 is made of vinyl fiber, polyester (polyethylene terephthalate (PET), polyethylene naphthalate (PEN), etc.), polyamide (nylon), aramid or other reinforcing fiber made of steel wire, spiral structure or blade It is formed by knitting and coating the outer surface of the inner surface layer 46 with a structure. Although not shown, two or more wire layers 48 may be provided. In that case, an intermediate resin layer or an adhesive layer (adhesive material) may be provided between the respective layers as necessary. An inner tube resin layer or an adhesive layer (adhesive) may be provided between the layer 48 and the inner surface layer 46.

  The sleeve 12 is extrapolated to the outer peripheral wall of the hose 44, and the hose 44 is crimped by pressurizing the outer peripheral wall of the sleeve 12 with a crimping device (not shown). By this caulking, the wire layer 48 is gripped by the ring-shaped convex portion 16 provided on the inner peripheral wall of the sleeve 12, and the hose 44 is firmly fixed as the wire layer 48 hits a wave. Further, the gap between the wire layer 48 and the sleeve 12 is sealed by the outer surface layer 50.

On the other hand, the inner surface layer 46 bites into the stepped portion 24 of the hose connecting portion 22 by caulking, the gap between the wire layer 48 and the hose connecting portion 22 is sealed, and the hose 44 is difficult to pull out from the fitting 10.
By tightly crimping the sleeve 12 in this way, the close contact between the sleeve 12, the hose 44, and the nipple 14 is enhanced, and the hose 44 is prevented from being pulled out and the sealing performance is further ensured.

  By the way, the crimping of the sleeve 12 is performed by first fitting the locking portion 18 of the sleeve 12 and the concave portion 20 of the nipple 14 in order to crimp the sleeve 12 and the nipple 14, and then connecting the hose 44 to the hose. A two-stage configuration in which the hose 44 is caulked by connecting to the portion 22 is adopted. Therefore, the strength of the crimping force for crimping the hose 44 is usually stronger at the tip of the hose connection part 22 than at the abutting part 42 side. Therefore, when the O-ring 52 is provided toward the tip of the hose connecting portion 22, the corner 57 of the O-ring 52 and the ring groove 56 damages the inner surface layer 46 of the hose 44 due to the caulking force, and fluid leakage from the hose 44 is prevented. May cause. Therefore, as shown in FIG. 3, the O-ring 52 is positioned between the first convex portion 16a and the second convex portion 16b when counted from the abutting portion side when crimped. It is preferable to attach to the hose connection part 22.

  The material of the O-ring 52 as the first seal member differs depending on the fluid flowing through the hose 44, but for example, when hydrogen gas is used as the fluid, fluororubber is preferable. Further, the material of the O-ring 54 as the second seal member differs depending on the fluid to be prevented from entering the inside of the fitting 10, but for example, when propelling water is to be prevented, ethylene propylene diene rubber (EDPM) and acrylonitrile butadiene rubber (NBR) are preferable.

It is a partial cross section figure which shows the side surface of the sleeve (a) and nipple (b) which are used for the metal fitting of this invention. It is a partial cross section figure which shows the metal fitting of the 1st Embodiment of this invention. It is a partial cross section figure which shows the state by which the hose was connected to the metal fitting of the 1st Embodiment of this invention.

Explanation of symbols

10 fittings 12 sleeve 14 nipple 16 convex portion 16a convex portion 16b convex portion 18 locking portion 20 concave portion 22 hose connecting portion 24 step portion 26 cylindrical portion 30 fixed hexagonal portion 40 hose tip portion 42 abutting portion 44 hose 46 inner surface layer 48 Wire layer 50 Outer surface layer 52 O-ring (first seal member)
54 O-ring (second seal member)
56 Ring groove 57 Corner 58 Ring groove

Claims (6)

A nipple comprising a hollow hose connection part into which a hose is inserted at one end, and a cylinder part communicating with the hose connection part at the other end,
A step portion formed in the circumferential direction on the outer peripheral wall of the hose connection portion; and
A plurality of ring-shaped convex portions are formed in the inner circumferential wall in the axial direction, and a sleeve for caulking the hose inserted into the hose connection portion,
An annular first seal member that is positioned between the convex portions when the sleeve is crimped and seals a gap between an outer peripheral wall of the hose connection portion and an inner peripheral surface of the hose;
A mouth metal fitting characterized by comprising:   Between the hose connection portion and the tube portion, a contact portion having a diameter larger than that of the hose connection portion and against which the tip end portion of the hose contacts is formed, and the first seal member is counted from the contact portion side. The fitting according to claim 1, wherein the fitting is provided between the first convex portion and the second convex portion.   An annular second seal member is provided on the outer peripheral wall of the abutting portion to seal a gap between the outer peripheral wall of the abutting portion and the inner peripheral wall of the sleeve when the sleeve is crimped. The cap metal fitting according to claim 1 or 2.   The said 1st seal member is an O-ring with which the ring groove formed in the outer peripheral wall of the said hose connection part was mounted | worn, The spigot of any one of Claims 1-3 characterized by the above-mentioned. .   The fitting according to any one of claims 1 to 4, wherein the second seal member is an O-ring mounted in a ring groove formed on an outer peripheral wall of the abutting portion.   A method for crimping a hose fitting, comprising: using the fitting according to claim 1, wherein the sleeve is crimped so that the first seal member is located between the convex portions.

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