JP2014228013A - Hose with metal fittings and method for assembling hose with metal fittings - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hose with metal fittings excellent in corrosion resistance performance of a wire composing a reinforcement layer, in which a ring body can be easily assembled between the reinforcement layer, the fittings and a sleeve, and a method for assembling the hose with metal fittings.SOLUTION: A hose with metal fittings 12 includes a flexible hose 14 with a reinforcement layer 18 composed of a metal wire, hose mouth fittings 22 having a nipple 24 inserted into the inside of the end part of the hose 14, and a sleeve 20, one end of which is locked to the hose mouth fittings 22 while the other end presses the hose 14 against the outer peripheral surface of the nipple 24 by caulking work. A non-conductive ring body 44 includes a vertical wall part 44A that contacts the end surface of the hose 14, and a lateral wall part 44B that contacts the inner peripheral surface of the hose 14, and by the ring body 44, the contact of the reinforcement layer 18 with the nipple 24 and the sleeve 20 is blocked.

Description

  The present invention relates to a metal hose and a method for assembling the metal hose.

  2. Description of the Related Art Conventionally, a hose with a fitting in which an end portion of a hose is fixed to a nipple by caulking is known.

  In order to ensure pressure resistance when this hose with metal fittings is used as piping for waterworks in a house, for example, a stainless steel wire that is resistant to corrosion due to rust is used as a reinforcing layer. Because it is used around water, even stainless steel wires are not completely free of rust concerns.

  In particular, when a copper alloy is used for the nipple, if the nipple and the stainless steel wire are in contact with each other in the mouthpiece caulking portion, the ionization tendency is relatively greater than that of the copper alloy due to the attachment of condensed water and household detergent. A phenomenon occurs in which iron elements in the stainless steel wire are eluted as iron ions. Corrosion of the wire proceeds rapidly due to the melting phenomenon caused by the contact of the stainless steel wire.

  If the outer cover is attached to the outer periphery of the hose, moisture can be prevented from coming into contact with the wire, so that corrosion can be prevented. However, when the outer cover is damaged due to some kind of injury and moisture penetrates into the inside, electric contact is still generated.

  Patent Document 1 below discloses a configuration in which a rubber O-ring is arranged between a reinforcing layer made of a metal wire at the tip of a hose and a vertical wall of a nipple.

JP 2007-278378 A

  In the hose with metal fittings described in Patent Document 1, by providing a rubber O-ring between the reinforcing layer at the tip of the hose and the vertical wall of the nipple, corrosion of the wire constituting the reinforcing layer is suppressed. Can do. However, since the O-ring is made of rubber and the O-ring is difficult to slip with respect to the nipple, it is difficult to mount the O-ring at a position where it comes into contact with the vertical wall of the nipple. For this reason, when inserting a nipple inside the tip of the hose, it is difficult to assemble an O-ring between the reinforcing layer at the tip of the hose and the vertical wall of the nipple. There is room for.

  The present invention has been made in view of the above problems, and is excellent in the corrosion resistance performance of the wire constituting the reinforcing layer, and can easily assemble a ring body between the reinforcing layer, the metal fitting, and the sleeve. An object of the present invention is to provide a method for assembling a hose with a hook and a hose with a metal fitting.

  In order to solve the above-mentioned problems, a metal hose according to the invention described in claim 1 is inserted into a flexible hose having a reinforcing layer made of a metal wire and inside the end of the hose. A metal fitting provided with a support part for supporting the inner peripheral surface of the hose, and one end locked to the metal fitting and the other end side extended along the outside of the hose. A metal sleeve that presses against the outer peripheral surface of the support portion; a vertical wall portion that contacts at least the end surface of the hose; and a lateral wall portion that contacts the inner peripheral surface of the hose, the reinforcing layer, the metal fitting, and the A non-conductive ring body that prevents contact with the sleeve.

  According to the first aspect of the present invention, the support portion of the metal fitting is inserted inside the end portion of the hose, and the metal sleeve presses the hose against the outer peripheral surface of the support portion by caulking. The non-conductive ring body includes at least a vertical wall portion and a horizontal wall portion, the vertical wall portion is in contact with the end surface of the hose, and the horizontal wall portion is in contact with the inner peripheral surface of the hose. For this reason, the ring body prevents contact between the reinforcing layer made of a metal wire, the metal fitting, and the sleeve, and can insulate the reinforcing layer from the metal fitting and the sleeve. In addition, in a state where the lateral wall portion of the ring body is inserted inside the tip portion of the hose, the tip portion of the hose and the ring body can be integrally inserted between the support portion of the metal fitting and the sleeve. For this reason, a ring body can be easily assembled | attached between the end surface of a hose, a metal fitting, and a sleeve.

  According to a second aspect of the present invention, in the hose with a metal fitting according to the first aspect, the lateral wall portion is formed with an outer peripheral inclined surface that is inclined downward toward the distal end side in a sectional view along the radial direction. It has a triangular shape.

  According to the second aspect of the present invention, the lateral wall portion of the ring body is formed in a triangular shape having an outer peripheral inclined surface that is inclined downward toward the distal end side in a sectional view along the radial direction. It is easy to insert the horizontal wall of the ring body into the hose. And while making the outer peripheral inclined surface of a horizontal wall part contact the inner peripheral surface of a hose, a vertical wall part is made to contact the end surface of a hose. In this state, the ring body is unlikely to be detached from the tip of the hose by integrally inserting the tip of the hose and the ring between the support part of the metal fitting and the sleeve. For this reason, a ring body can be easily assembled | attached between the end surface of a hose, a metal fitting, and a sleeve.

  According to a third aspect of the present invention, in the hose with a metal fitting according to the second aspect, the outer peripheral inclined surface includes a plurality of convex portions that prevent slipping with the inner peripheral surface of the hose.

  According to the third aspect of the present invention, the plurality of convex portions that prevent the hose from sliding with the inner peripheral surface of the hose are formed on the outer peripheral inclined surface of the ring body, and the tip of the hose and the ring body are supported by the metal fittings. When inserted between the portion and the sleeve, the ring body is more difficult to come off from the tip of the hose.

  The method for assembling the hose with metal fittings according to the invention of claim 4 is the method for assembling the hose with metal fittings according to any one of claims 1 to 3, wherein the hose is attached to the tip of the hose. Inserting the lateral wall portion of the ring body, bringing the lateral wall portion into contact with the inner peripheral surface of the hose, bringing the longitudinal wall portion into contact with the end surface of the hose, and inserting the lateral wall portion of the ring body Inserting the tip of the hose between the support part of the metal fitting and the sleeve and bringing the vertical wall part into contact with the support part and the innermost part of the sleeve; and caulking from the outside of the sleeve And performing a process to press the hose against the outer peripheral surface of the support portion.

  According to invention of Claim 4, while inserting the horizontal wall part of a ring body in the front-end | tip part of a hose, a horizontal wall part is made to contact the internal peripheral surface of a hose, and a vertical wall part is made to contact the end surface of a hose. Next, the tip of the hose into which the lateral wall portion of the ring body is inserted is inserted between the support portion of the metal fitting and the sleeve, and the vertical wall portion is brought into contact with the deepest portion of the support portion and the sleeve. At that time, the horizontal wall of the ring body is inserted into the tip of the hose so that the horizontal wall is in contact with the inner peripheral surface of the hose and the vertical wall is in contact with the end of the hose. When inserted between the support portion and the sleeve, the ring body is unlikely to come off from the tip of the hose. Thereafter, crimping is performed from the outside of the sleeve, and the hose is pressed and fixed to the outer peripheral surface of the support portion. Therefore, the non-conductive ring body can insulate the reinforcing layer made of the wire from the metal fitting and the sleeve, and can easily assemble the ring body between the end surface of the hose, the metal fitting and the sleeve.

  According to this invention, while being excellent in the corrosion resistance performance of the wire which comprises a reinforcement layer, a ring body can be easily assembled | attached between a reinforcement layer, a metal fitting, and a sleeve.

FIG. 1 is a cross-sectional view showing a hose with metal fittings according to a first embodiment of the present invention. 2A is a half-sectional view showing the ring body, and FIG. 2B is a plan view showing the ring body. 3 (A) to 3 (C) are cross-sectional views showing a process of assembling the hose to the metal fitting. FIG. 4 is a half sectional view showing a modification of the ring body. It is sectional drawing which shows the hose with a metal fitting of a comparative example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a metal hose 12 according to a first embodiment of the present invention. FIG. 1 shows a state where the hose fitting 22 and the hose 14 are connected. As shown in FIG. 1, the hose 12 with a fitting includes a hose 14, a hose fitting 22 as a fitting whose one end is inserted into the hose 14, and an overlapping portion 34 of the hose 14 and the hose fitting 22. And a metal sleeve 20 disposed outside the hose 14.

  The sleeve 20 exerts an action of pressing the hose 14 against an outer peripheral surface of a nipple 24 described later by being crimped. In the present embodiment, the sleeve 20 is made of, for example, stainless steel. The sleeve 20 is folded inward at one end 20A in the axial direction of the sleeve 20 and hooked on a protruding locking portion 32 provided on the outer periphery of the nipple 24, thereby preventing the sleeve 20 from coming off from the hose fittings 22. Has been.

  The hose 14 has a three-layer structure including an inner surface layer tube 16, a reinforcing layer 18 disposed around the tube 16, and an outer skin 19 that covers the outer periphery of the reinforcing layer 18. In this embodiment, the inner surface layer tube 16 is composed of a rubber layer, and is composed of a metal reinforcing wire (for example, a stainless steel wire) in which the reinforcing layer 18 is braided. Further, the outer skin 19 is composed of a rubber layer. Thereby, the resistance of the inner surface layer tube 16 is ∞, the resistance of the reinforcing layer 18 is 0, and the resistance of the outer skin 19 is ∞.

  The hose fitting 22 includes a copper alloy nipple 24 as a support portion formed in a substantially cylindrical shape. The nipple 24 has an outer diameter D1 that is larger than the inner diameter D2 of the hose 14.

  A tapered portion 26 is formed at the tip of the nipple 24, that is, the insertion end side into the hose 14, so that the nipple 24 can be easily inserted into the hose 14.

  The hose fitting 22 has a substantially hexagonal enlarged diameter portion 28 formed so as to protrude radially outward at an intermediate portion in the axial direction, and a connection formed at the end opposite to the tapered portion 26 of the nipple 24. Part 30. The connecting portion 30 is formed with a protruding portion 30A protruding outward in the radial direction at an end portion in the axial direction. An engaging portion 38 </ b> A formed to protrude radially inward is engaged with the protruding portion 30 </ b> A of the connecting portion 30 at the axial end portion of the nut 38.

  An annular rubber seal 40 is inserted inside the nut 38. Other piping or the like is connected to the nut 38 via a seal material 40. At this time, a male screw part such as another pipe is easily screwed into the female screw part 38B of the nut 38 by attaching a spanner to the substantially hexagonal enlarged diameter part 28 and fixing it.

  A flange-like locking portion 32 in which the diameter of the nipple 24 is partially enlarged is formed at a position spaced apart from the enlarged diameter portion 28 toward the tapered portion 26 by a predetermined distance.

  In the nipple 24, a sawtooth portion 36 whose outer periphery has a sawtooth shape in a cross-sectional view is formed in a part of an overlapping portion 34 in which the nipple 24 is inserted into the hose 14. The direction of the teeth of the sawtooth portion 36 is such that resistance is generated against inadvertent disconnection of the hose 14 in a state where the nipple 24 is inserted into the hose 14. In order to prevent the hose 14 from being inadvertently pulled out in this way, a plurality of annular irregularities may be formed instead of the sawtooth portion 36.

  Further, the sleeve 20 is formed with a sawtooth portion 20 </ b> B whose inner periphery is formed in a sawtooth shape in a cross-sectional view at a part of the overlapping portion 34 with the hose 14. The direction of the teeth of the sawtooth portion 20 </ b> B is such that resistance is generated against inadvertent removal of the hose 14 in a state where the hose 14 is inserted inside the sleeve 20. In order to prevent inadvertent disconnection of the hose 14 as described above, a plurality of annular irregularities may be formed instead of the sawtooth portion 20B.

  Between the distal end portion 14A in the insertion direction of the hose 14 and the nipple 24 and the rear end portion (the innermost portion) of the sleeve 20 in the insertion direction of the hose 14, the reinforcing layer 18, the nipple 24, and the sleeve 20 A ring body 44 is provided to prevent contact between the two. The ring body 44 is formed of a non-conductive or insulating material. For example, the ring body 44 is formed of an insulating polymer such as a fluororesin, an epoxy resin, a phenol resin, or a silicone resin. In the present embodiment, the ring body 44 is made of a fluororesin.

  As shown in FIG. 2, the ring body 44 is formed in a substantially L shape in a cross-sectional view along the radial direction, and the vertical wall portion 44 </ b> A that contacts the end surface of the hose 14, A horizontal wall portion 44B in contact with the peripheral surface. The horizontal wall portion 44B has a substantially triangular shape formed with an outer peripheral inclined surface 44C that is inclined downward toward the distal end in a sectional view along the radial direction.

  In the present embodiment, the angle between the inner surface of the lateral wall portion 44B and the outer peripheral inclined surface 44C is α (degrees) in a sectional view along the radial direction. In the present embodiment, when the outer diameter of the vertical wall portion 44A is D3 and the diameter (diameter) of the boundary portion between the vertical wall portion 44A and the outer peripheral inclined surface 44C is D4, (D3-D4) / 2 is It is set to a value close to the thickness (thickness) of the hose 14. In the present embodiment, (D3-D4) / 2 is set smaller than the thickness (thickness) of the hose 14. Moreover, the outer diameter of the front-end | tip part (lower end part of the outer peripheral inclined surface 44C) of the horizontal wall part 44B is formed larger than the internal diameter D2 (refer FIG. 1) of the hose 14 (refer FIG. 1).

  Further, the inner diameter of the lateral wall portion 44B of the ring body 44 is set to be slightly larger than the outer diameter D1 (see FIG. 1) of the nipple 24, and the lateral wall portion 44B of the ring body 44 can be inserted into the outer peripheral side of the nipple 24. It is said that.

  Next, a method for assembling the metal hose 12 will be described.

  In the hose 12 with metal fittings of this embodiment, the hose mouth fitting 22 is assembled to the hose 14 by the process shown in FIG. As shown in FIG. 3A, the horizontal wall portion 44 </ b> B of the ring body 44 is inserted into the tip portion 14 </ b> A of the hose 14 before the hose 14 is inserted into the hose fitting 22. The outer diameter of the front end portion of the horizontal wall portion 44B (the lower end portion of the outer peripheral inclined surface 44C) is formed larger than the inner diameter D2 (see FIG. 1) of the hose 14. At that time, the lateral wall portion 44B of the ring body 44 has a substantially triangular shape with an outer peripheral inclined surface 44C formed so as to be inclined downward toward the distal end side, and the ring body is formed inside the distal end portion 14A of the hose 14. 44 horizontal wall portions 44B can be easily inserted. Then, with the inner peripheral surface of the tip portion 14A of the hose 14 being in contact with the outer peripheral inclined surface 44C of the ring body 44, the end surface of the tip portion 14A of the hose 14 is brought into contact with the side surface of the vertical wall portion 44A of the ring body 44. .

  Next, as shown in FIG. 3B, the nipple of the hose fitting 22 is integrated with the hose 14 and the ring body 44 in a state where the lateral wall portion 44B of the ring body 44 is inserted inside the tip end portion 14A of the hose 14. 24 and the sleeve 20 are inserted. During the insertion, the inner peripheral surface of the hose 14 comes into contact with the tapered portion 26, but when further inserted into the nipple 24, the inner peripheral surface of the hose 14 is pushed outward by the tapered portion 26.

  Further, the hose 14 and the ring body 44 are inserted, and the ring body 44 inserted into the tip portion 14A of the hose 14 is brought into contact with the locking portion 32 on the back side of the nipple 24 and the wall portion on the back side of the sleeve 20. At that time, since the vertical surface of the locking portion 32 also serves to fix the position of the ring body 44, the vertical wall portion 44A of the ring body 44 is pressed between the locking portion 32 and the distal end portion 14A of the hose 14. And fixed in close contact with both.

  In the present embodiment, since the lateral wall portion 44B of the ring body 44 is inserted in advance inside the tip portion 14A of the hose 14, the hose 14 and the ring body 44 are inserted between the nipple 24 of the hose fitting 22 and the sleeve 20. The ring body 44 is unlikely to come off from the tip 14A of the hose 14. This prevents the ring body 44 from coming off from the tip portion 14A of the hose 14 during assembly.

  Thereafter, as shown in FIG. 3C, the sleeve 20 is crimped from the outer peripheral side, whereby the hose 14 is pressed against the outer peripheral surface of the nipple 24, and the hose fitting 22 is fixed to the hose 14. At this time, the sleeve 20 is structured so as not to pierce the rubber outer skin 19 of the hose 14 by caulking.

  In such a metal hose 12, the metal wire (in this embodiment, a stainless steel wire) that constitutes the reinforcing layer 18 of the hose 14, the engaging portion 32 of the nipple 24, and the sleeve 20 are insulated by the ring body 44. In addition, since it is in a non-contact state, it is possible to prevent the occurrence of electrocorrosion.

  Further, in the present embodiment, the end surface of the front end portion 14A of the hose 14 is brought into contact with the side surface of the vertical wall portion 44A of the ring body 44 by inserting the horizontal wall portion 44B of the ring body 44 in advance inside the front end portion 14A of the hose 14. The inner peripheral surface of the tip portion 14A of the hose 14 is brought into contact with the outer peripheral inclined surface 44C of the ring body 44. In this state, since the hose 14 and the ring body 44 are integrally inserted between the nipple 24 and the sleeve 20 of the hose fitting 22, the ring body 44 is prevented from coming off from the tip portion 14A of the hose 14, and the hose 14 The reinforcing layer 18, the locking portion 32 of the nipple 24, and the sleeve 20 can be more reliably insulated.

  Furthermore, in this embodiment, since the ring body 44 is formed of a polymer such as a fluororesin, the ring body 44 attached to the distal end portion 14A of the hose 14 is connected to the nipple 24 of the hose mouth fitting 22 and the sleeve 20. Easy to insert between them, improving workability during assembly.

  FIG. 5 shows a hose 100 with fittings of a comparative example. As shown in FIG. 5, in the metal hose 100, the ring body 44 as in the present embodiment is not provided at the tip portion 14 </ b> A of the hose 14. In such a configuration, the end face of the tip portion 14A of the hose 14 and the locking portion 32 of the nipple 24 are in contact with each other. For this reason, there is a high possibility that the reinforcing layer 18 of the hose 14 and the engaging portion 32 of the nipple 24 are in contact with each other, and it is difficult to prevent or suppress the occurrence of electrocorrosion.

  On the other hand, as described in Japanese Patent Application Laid-Open No. 2007-278378 (Patent Document 1), a rubber made of a non-conductive material is provided between the distal end portion 14A of the hose 14 and the engaging portion 32 of the nipple 24. An O-ring can also be provided. Thereby, it can suppress that the reinforcement layer 18 of the hose 14 and the latching | locking part 32 of the nipple 24 contact with rubber | gum O-rings. However, in this configuration, it is necessary to first insert the rubber O-ring from the tapered portion 26 side of the nipple 24 and then insert the nipple 24 into the hose 14. Since the rubber O-ring is difficult to slide with respect to the outer peripheral surface of the nipple 24, the O-ring is easily detached from the end surface of the tip portion 14 </ b> A of the hose 14, and the O-ring is engaged with the end surface of the tip portion 14 </ b> A of the hose 14. The work at the time of assembling with the part 32 becomes complicated.

  On the other hand, in this embodiment, as shown in FIG. 3A, by inserting the horizontal wall portion 44B of the ring body 44 in advance inside the tip portion 14A of the hose 14, the tip portion 14A of the hose 14 is inserted. The end surface is brought into contact with the side surface of the vertical wall portion 44A of the ring body 44, and the inner peripheral surface of the tip portion 14A of the hose 14 is brought into contact with the outer peripheral inclined surface 44C of the ring body 44. In this state, as shown in FIG. 3B, the hose 14 and the ring body 44 are integrally inserted between the nipple 24 of the hose fitting 22 and the sleeve 20, so The ring body 44 is prevented from coming off. For this reason, the workability | operativity at the time of the assembly | attachment of the ring body 44 with the end surface of 14 A of front-end | tip parts of the hose 14 and the latching | locking part 32 of the nipple 24 is improved, and productivity of the hose 12 with a metal fitting can be improved.

FIG. 4 shows a modification of the ring body used in the hose with a metal fitting according to the present invention.
As shown in FIG. 4, the ring body 60 is formed with an outer peripheral inclined surface 60 </ b> A on the lateral wall portion 44 </ b> B so as to have a downward slope toward the distal end side in a cross-sectional view along the radial direction. In the middle of the outer peripheral inclined surface 60A in the axial direction, a plurality of fine thread-like convex portions 60B protruding outward in the radial direction are formed.

  In such a ring body 60, when the horizontal wall portion 44B is inserted into the tip portion 14A (see FIG. 1) of the hose 14, the plurality of convex portions 60B bite into the inner peripheral surface of the tip portion 14A of the hose 14. Accordingly, when the hose 14 and the ring body 60 are integrally inserted between the nipple 24 of the hose fitting 22 and the sleeve 20, the sliding between the ring body 60 and the inner peripheral surface of the hose 14 is caused by the plurality of convex portions 60 </ b> B. Is suppressed, and the ring body 60 can be prevented from coming off from the hose 14.

  In the above embodiment, three convex portions 60B are formed. However, the present invention is not limited to this, and the number of convex portions 60B may be set to other numbers. Moreover, the height of the convex part 60B is not limited to this, It can change.

12 Hose with metal fittings 14 Hose 14A Tip 18 Reinforcing layer 20 Sleeve 22 Hose fitting (metal fitting)
24 Nipple (support)
26 Tapered portion 28 Expanded portion 44 Ring body 44A Vertical wall portion 44B Horizontal wall portion 44C Peripheral inclined surface 60 Ring body 60A Peripheral inclined surface 60B Convex portion

Claims (4)

A flexible hose with a reinforcing layer made of metal wire;
A metal fitting provided with a support portion that is inserted inside the end portion of the hose and supports the inner peripheral surface of the hose;
One end is locked to the metal fitting and the other end extends along the outside of the hose, and a metal sleeve that presses the hose against the outer peripheral surface of the support portion by crimping;
A non-conductive ring body that includes at least a vertical wall portion that contacts an end surface of the hose and a horizontal wall portion that contacts an inner peripheral surface of the hose, and prevents contact between the reinforcing layer, the metal fitting, and the sleeve; ,
Hose with metal fittings.   The hose with a metal fitting according to claim 1, wherein the lateral wall portion has a triangular shape having an outer peripheral inclined surface that is inclined downward toward the distal end side in a sectional view along a radial direction.   The hose with metal fittings according to claim 2, wherein the outer peripheral inclined surface includes a plurality of convex portions that prevent slipping with the inner peripheral surface of the hose. A method for assembling the hose with metal fittings according to any one of claims 1 to 3,
Inserting the lateral wall portion of the ring body into the tip of the hose, bringing the lateral wall portion into contact with the inner peripheral surface of the hose, and bringing the longitudinal wall portion into contact with the end surface of the hose;
The tip of the hose into which the lateral wall portion of the ring body is inserted is inserted between the support portion and the sleeve of the metal fitting, and the vertical wall portion contacts the support portion and the innermost portion of the sleeve. A process of
Performing caulking from the outside of the sleeve and pressing the hose against the outer peripheral surface of the support;
Of assembling a hose with metal fittings.

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