JP2002130570A - Hose coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a pipe without leak of a soft hose. SOLUTION: A split pipe is shrunk to a diameter by being narrowed toward a peripheral direction while at the same time the ratio of a shrinkage diameter versus entire length in a radial direction of a peripheral extended portion 2b is further smaller than that in the radial direction of an axially extending portion 2c except for the peripheral extended portion 2b, making it difficult to cause biting-into the outer peripheral surface of the soft hose H opposed to the peripheral extended portion 2b while at the same time even, if a cavity is produced between the peripheral extended portion 2b of the hose H and outer peripheral surface 1a of a nipple 1 by biting into the outer peripheral surface of the soft hose H opposed to the peripheral extended portion 2b, an annular sealing member 1b opposed to the cavity faces abuts thereon, thereby the cavity being cut off to be linearly embedded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose joint for connecting a hose through which a liquid such as water or oil, a gas such as air, or a fluid such as powder passes. More specifically, the present invention relates to a hose joint in which a hose is inserted into an outer peripheral surface of a nipple, a sleeve is covered along the outer periphery, and the sleeve is tightened so that it contracts in a radial direction so that an inner peripheral surface of the hose comes into close contact with an outer peripheral surface of the nipple. .

[0002]

2. Description of the Related Art Conventionally, hose joints of this type have been proposed, for example, in Utility Model Registration No. 2564380 and Japanese Utility Model Application Laid-Open No. 57-18-18.
As disclosed in Japanese Patent No. 2691, a linear slit is formed over the entire length in the axial direction of the sleeve, and the linear slit is narrowed in the circumferential direction with the tightening of the sleeve, so that the entire sleeve contracts in the radial direction. (Hereinafter referred to as reduced diameter)
In some cases, the hose is pressed against the outer peripheral surface of the nipple. On the other hand, a flexible hose that is easy to bend has a material distortion at the reduced diameter portion after the passage of time in a state where the hose is reduced in diameter and connected to a pipe, so that the elastic hose is restored to its original shape while being compressed and deformed. As a result, the pressing force of the hose against the outer peripheral surface of the nipple was weakened, and a gap was generated between the two, causing leakage and hose detachment.

[0003]

However, in such a conventional hose joint, when a deformable soft hose is inserted between the sleeve and the nipple, the deformable soft hose extends in the axial direction of the outer periphery of the soft hose facing the linear cut. The straight line that extends
It is easy to be bitten by narrowing the slit in the circumferential direction and reducing the diameter, and this biting portion is bent in a substantially U-shape, bulging outward, and a cavity is formed between the nipple and the outer peripheral surface in the axial direction. Since they occur in a straight line, there is a problem that leakage occurs therefrom. In order to prevent this, even if the sleeve no longer leaks by further tightening the sleeve and reducing the diameter, the soft hose may cause material distortion at the reduced diameter portion over time. Cannot be completely prevented.

An object of the present invention is to connect a flexible hose to a pipe without leaking. The invention described in claim 2 aims at improving the leak prevention function in addition to the object of the invention described in claim 1. The third aspect of the present invention has the object of preventing the displacement of the circumferentially extending portion and the annular sealing material due to the diameter reduction in addition to the object of the first or second aspect of the present invention.

[0005]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, a slit formed over the entire length of the sleeve in the axial direction is provided with the axial direction of the sleeve. A circumferentially extending portion that crosses and extends in the circumferential direction is partially provided, and an elastically deformable annular sealing material is protrudingly provided on the outer peripheral surface of the nipple that abuts against the circumferentially extending portion. According to a second aspect of the present invention, in the configuration of the first aspect, a plurality of circumferentially extending portions are partially provided over the entire length of the slit, and a plurality of annular seal members are respectively protruded in opposition to the circumferentially extending portions. It is characterized by the added configuration. According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the present invention, a configuration in which a positioning means for the nipple is provided on the sleeve is added.

[0006]

According to the first aspect of the present invention, the slit formed in the entire length in the axial direction of the sleeve is partially provided with a circumferentially extending portion that extends in the circumferential direction so as to intersect with the axial direction, thereby narrowing the split in the circumferential direction. As the diameter is reduced, the diameter reduction ratio of the circumferentially extending portion to the entire length in the radial direction is much smaller than the diameter reduction ratio of the portion extending in the axial direction other than the circumferentially extending portion to the total length in the radial direction. Even if it becomes difficult for the outer peripheral surface of the facing soft hose to bite, and even in the unlikely event that a cavity is generated between the peripheral portion and the outer peripheral surface of the facing soft hose and the nipple, By contacting the annular sealing material facing the cavity, the cavity is linearly buried and blocked. According to a second aspect of the present invention, in addition to the configuration of the first aspect, a plurality of circumferentially extending portions are provided partially over the entire length of the slit, and a plurality of annular seal members are respectively provided so as to face the circumferentially extending portions. Since the configuration described above is added, the cavity is blocked at a plurality of locations over the entire length in the axial direction of the sleeve by bringing the plurality of annular seal members into contact with the plurality of circumferentially extending portions. According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, a configuration in which a positioning means for the nipple is provided on the sleeve is added, so that the peripheral portion and the annular sealing material are accurately aligned by the positioning means. Is done.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, a cylindrical nipple 1 is provided at one axial end of a joint body A made of a hard material such as a metal or a hard synthetic resin.
And a tubular body 4 surrounding the same, a soft hose is inserted as a hose H into the outer peripheral surface 1a of the nipple 1, a sleeve 2 is put along the outer periphery thereof, and a nut 3 is put on the outer side. The sleeve 2 is screwed in the circumferential direction by screwing the sleeve 2 into the cylindrical body 4 and rotating the sleeve.

The sleeve 2 is formed of a material which can be elastically deformed, such as a hard rubber or a hard synthetic resin, and is formed in a cylindrical shape. The sleeve 2 has a slit 2a formed along its entire length in the front-rear direction in the axial direction. A circumferentially extending portion 2b that extends in the circumferential direction so as to intersect with the axial direction of the sleeve 2 is partially provided.

In the case of this embodiment, three circumferentially extending portions 2b are arranged at appropriate intervals in the axial direction of the slit 2a so as to be orthogonal to the axial direction, and these circumferentially extending portions 2b and the other axial directions are arranged. Are connected to each other in an arc shape, so that the entire cut 2a is substantially S-shaped. The inner peripheral surface 2d of the sleeve 2 is provided with irregularities that are continuous in the axial direction, in the illustrated example, as shown in FIG. Preferably, it is formed.

Further, the sleeve 2 is configured so that the slit 2a is narrowed in the circumferential direction by tightening the sleeve 2 in the circumferential direction by rotating the nut 3 described later. Specifically, the outer circumferential surface of the sleeve 2
By gradually decreasing the outer diameter from the front / rear intermediate position to the front / rear ends, the rear taper surface 2e and the front taper surface 2f are opposite to each other, and the axial dimension of the rear taper surface 2e is reduced. It is larger than the front tapered surface 2f.

On the inner peripheral surface of the nut 3, a female screw portion 3a formed on the outer peripheral surface of the cylindrical body 4 is screwed so as to be able to advance and retreat in the axial direction. A tapered hole surface 3b having a tapered surface 2e facing in parallel and a step 3c located between the female screw portion 3a and the tapered hole surface 3b are formed. In order to improve the biting of the tapered hole surface 3b with the tapered surface 2e of the sleeve 2, it is preferable to form an irregularity that is continuous in the axial direction, in the illustrated example, a thread as shown in FIG.

The sleeve 2 is provided with a positioning means 2g for fixing the sleeve 2 immovably with respect to the nipple 1. In the case of this embodiment, as the positioning means 2g, an annular projection is provided around the outer circumferential surface of the sleeve 2 in the axially front-rear intermediate portion.
The annular projection 2g is interposed between the tip end surface 4b of the cylindrical body 4 and fixed so as not to move in the axial direction.

On the other hand, on the outer peripheral surface 1a of the nipple 1,
The elastically deformable annular sealing member 1b is connected to the peripheral extending portions 2b.
And protrude from each other at positions facing each other. The elastically deformable annular sealing member 1b is, for example, an O-ring or the like. In the case of the present embodiment, the three annular sealing members 1b opposed to the three peripheral portions 2b. 1 are fitted orthogonally to the axial direction.

The base end 1c of the nipple 1 is formed in a tapered shape whose outer diameter gradually increases as it moves away from the opening end 1d, and the base end taper 1c and the cylindrical body 4 opposed thereto are formed. A cylindrical space portion S thicker than the thickness of the soft hose H is formed between the inner peripheral surfaces. Further, a tapered hole surface 4 c facing the front tapered surface 2 f of the sleeve 2 in parallel with the inner peripheral surface of the cylindrical body 4.
Is formed.

In the case of this embodiment, a cylindrical connecting tube portion A1 is integrally formed at the other end of the joint body A in the axial direction for connection to another machine. For example, a connection portion A2 such as a screw is formed.

The soft hose H is made of a soft material such as a soft synthetic resin such as vinyl chloride or rubber, and preferably has a flat inner peripheral surface H1 and an outer peripheral surface H2, but is not limited thereto. Instead, a metal spring or a reinforcing wire made of a hard synthetic resin may be spirally embedded in the inner and outer intermediate layers, and the outer peripheral surface H2 may have some irregularities. In the illustrated example, as shown in FIG. 1 (b), a braided reinforcing yarn Y made of a hard synthetic resin is used in a transparent inner / outer intermediate layer.

Next, a method of assembling such a hose joint will be described in accordance with procedures. First, from the disassembled state shown in FIG. 1A, a soft hose H is inserted into the outer peripheral surface 1 a of the nipple 1 and pushed so that the distal end H 1 reaches near the tapered base end 1 c of the nipple 1.

Subsequently, the sleeve 2 is covered along the outer periphery of the soft hose H, and the nut 3 is further covered on the outside thereof, and the female screw portion 3a on the inner periphery is connected to the male screw portion 4 on the outer periphery of the cylindrical body 4.
Screw with a. In this state, a tool (not shown) such as a wrench is engaged with the outer peripheral surface of the nut 3, and the nut 3 is rotated and screwed forward toward the base end of the joint body A.

Thus, the tapered hole surface 3b of the nut 3
Engages with the rear tapered surface 2 e of the sleeve 2, narrows the rear side of the cut 2 a in the circumferential direction, and substantially the entire part of the sleeve 2 except for a part on the front side is reduced in diameter (contracted in the radial direction), The inner peripheral surface 2d of the sleeve 2 is pressed against the outer peripheral surface H2 of the soft hose H.

As the nut 3 is tightened in the circumferential direction, the screw thread formed on the tapered hole surface 3b of the nut 3 bites the tapered surface 2e of the sleeve 2 and the screw formed on the inner peripheral surface 2d of the sleeve 2 at the same time. The hill bites into the outer peripheral surface H2 of the soft hose H, and these are integrated.

Thereafter, when the nut 3 is further screwed, the sleeve 2 and the soft hose H slide forward together with respect to the outer peripheral surface 1a of the nipple 1, and accordingly, the front tapered surface 2f of the sleeve 2 is moved to the cylindrical body 4. , The front side of the slit 2a is narrowed in the circumferential direction, and the front side of the sleeve 2 is reduced in diameter.

Finally, as shown in FIG.
The annular projection of the sleeve 2 constituting the positioning means 2g is
The sleeve 2 is sandwiched between the step 3c of the nut 3 and the distal end surface 4b of the cylindrical body 4, and is fixed to the nipple 1 so as not to move in the axial direction. In this positioning state, each peripheral portion 2b of the slit 2a and each annular sealing member 1b are accurately aligned.

In addition, when the diameter is reduced, the cutting 2a is used.
Outer circumferential surface H2 of the soft hose H facing a portion 2c extending in the axial direction other than the circumferentially extending portion 2b in accordance with the narrowing in the circumferential direction.
May be bitten. However, the diameter reduction ratio of the circumferentially extending portion 2b to the entire length in the radial direction is much smaller than the diameter reduction ratio of the portion 2c extending in the axial direction other than the circumferentially extending portion 2b to the entire length in the radial direction. The outer peripheral surface H2 of the hose H is hardly caught.

As shown in FIG. 2, the outer peripheral surface H2 of the soft hose H facing the peripheral portion 2b is bitten, and the bite portion is bent in a substantially U-shape and bulges outward to form the nipple 1. Even if a cavity is formed between the outer peripheral surface 1a and the outer peripheral surface 1a, the annular sealing member 1b facing the cavity comes into contact. As a result, the cavity is buried linearly and cut off, and as a result, the flexible hose H can be connected to the nipple 1 of the joint body A without leaking.

By the way, the elasticity maintaining force of the elastic material such as synthetic rubber which constitutes the annular sealing material 1b is generally much longer than the time elapsed until the reduced diameter portion of the soft hose H causes material distortion. If the annular sealing material 1b having such a long elastic maintenance force is used, the sleeve 2
Leakage can be completely prevented over a long period of time without further tightening.

Particularly, in the case of the present embodiment, three circumferentially extending portions 2b are partially provided over the entire length of the slit 2a, and three annular sealing members 1b are respectively brought into contact with these circumferentially extending portions 2b. By doing so, the cavity is blocked at three locations over the entire length of the sleeve 2 in the axial direction. As a result, the leakage prevention function can be improved by the number of the blocking portions.

Further, in the case of this embodiment, the soft hose H
A braid made of a hard synthetic resin reinforcing yarn Y woven in a transparent inner / outer intermediate layer is used, and the cut surface H3 at the distal end is formed between the base tapered portion 1c and the inner peripheral surface of the cylindrical body 4. The reinforcing yarn Y does not move and does not come off from the cut surface H3 because it is inserted into the portion S and the portion away from the cut surface H3 is sandwiched and fixed between the sleeve 2 and the nipple 1.

On the other hand, the one shown in FIG. 3 and the one shown in FIG. 4 are each another embodiment of the present invention. In FIG. 3, one peripheral portion 2b is arranged in the axial direction of the slit 2a so as to be orthogonal to the axial direction, and the peripheral portion 2b is connected to the other axially extending portion 2c in an arc shape. 1 and 2 shows a configuration in which the entire slit 2a is formed into a crank shape, and one annular sealing member 1b is protruded from the outer peripheral surface 1a of the nipple 1 so as to face the peripheral extension 2b. In other respects, the configuration is the same as that of the embodiment shown in FIGS. 1 and 2.

Therefore, what is shown in FIG.
Is simplified and the annular sealing material 1b is reduced to one of the minimum. As a result, the structure can be simplified and the manufacturing cost can be reduced to the lowest level as compared with the embodiment shown in FIGS. There is an advantage that it can be reduced.

FIG. 4 shows the slit 2a.
The two peripherally extending portions 2b, 2b are arranged at appropriate intervals in the axial direction of the axis and are respectively orthogonal to the axial direction, and these peripherally extending portions 2b, 2b
And the other axially extending portion 2c are connected in an arc shape to make the entire cut 2a substantially U-shaped.
The configuration in which the two annular sealing members 1b, 1b are protrudingly provided on the outer peripheral surface 1a of the nipple 1 in opposition to the peripheral extending portions 2b, 2b is different from the embodiments shown in FIGS. Is the same as in both embodiments shown in FIGS.

Therefore, what is shown in FIG.
And the number of annular sealing members 1b can be reduced to two. As a result, the structure can be simplified most and the manufacturing cost can be reduced as compared with the embodiment shown in FIG. 1 and FIG.
There is an advantage that the leak prevention function can be improved by the greater number of cut-off points than in the embodiment shown in FIG.

In the above-described embodiment, the sleeve 2 is tightened in the radial direction by rotating the nut 3 placed on the outer side of the sleeve 2. However, the present invention is not limited to this. You may tighten in the direction. Further, at the other end in the axial direction of the joint main body A, a cylindrical connection tube portion A1 is integrally formed to protrude for connection to another machine. However, the present invention is not limited to this. You don't have to.

Further, a circumferentially extending portion 2b is provided to be orthogonal to the axial direction of the sleeve 2, and an annular sealing member 1b opposed thereto is protrudingly provided to be orthogonal to the axial direction of the nipple 1. However, the present invention is not limited to this. If the portion 2b and the annular sealing material 1b can be arranged facing each other, the peripheral portion 2b is inclined with respect to the axial direction of the sleeve 2.
May be provided, and the annular sealing member 1b may be protruded by being inclined at the same angle as the axial direction of the nipple 1. Furthermore, the base end 1c of the nipple 1 is formed in a tapered shape in which the outer diameter gradually increases as the base end 1c moves away from the opening end 1d. However, the present invention is not limited to this, and the base end 1c of the nipple 1 is not tapered. It may be formed in a cylindrical shape having the same diameter from the open end 1d.

[0034]

As described above, according to the first aspect of the present invention, the slit formed along the entire length of the sleeve in the axial direction is provided with the circumferentially extending portion extending in the circumferential direction so as to intersect the axial direction. With the provision of the part, the diameter of the part extending in the axial direction is reduced with respect to the total length in the radial direction of the part other than the peripheral part in accordance with the reduction of the diameter by narrowing the slit in the circumferential direction. The ratio is much smaller than the ratio, so that the outer peripheral surface of the soft hose facing the peripheral portion hardly bites, and the outer peripheral surface of the soft hose facing the peripheral portion bites, Even if a cavity is formed between the cavity and the outer peripheral surface, the cavity is linearly buried and cut off by the contact of the annular sealing material facing the cavity, so that the piping can be connected without leaking the soft hose. . Therefore, as the linear slit is narrowed in the circumferential direction, the linear portion extending in the axial direction of the outer periphery of the soft hose is easily bitten, and the bite portion is bent in a substantially U-shape to form a gap between the linear portion and the outer peripheral surface of the nipple. Compared to the conventional type in which cavities are generated in a straight line in the axial direction, the use of an annular seal material having a much longer elastic retention force than the time elapsed until the reduced diameter portion of the soft hose causes material distortion. The leakage can be completely prevented for a long period of time without further tightening of the sleeve.

According to a second aspect of the present invention, in addition to the effect of the first aspect, a plurality of annular sealing members are respectively brought into contact with a plurality of peripheral extending portions, so that a plurality of annular sealing members are provided along the entire axial length of the sleeve. Since the cavity is cut off, the leak prevention function can be improved.

According to a third aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, since the peripheral portion and the annular seal material are accurately aligned by the positioning means, the peripheral portion and the annular seal are reduced due to the diameter reduction. Displacement of the material can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view of a hose coupling according to an embodiment of the present invention, in which (a) shows a disassembled state before being assembled, and (b)
Indicates an enlarged state after being assembled and is partially cut away.

FIG. 2 is an enlarged longitudinal sectional side view taken along the line (2)-(2) of FIG. 1 (b).

FIG. 3 is a partially cutaway front view of a hose joint according to another embodiment of the present invention.

FIG. 4 is a partially cutaway front view of a hose joint according to another embodiment of the present invention.

[Explanation of symbols]

 H Hose (soft hose) H1 Inner peripheral surface 1 Nipple 1a Outer peripheral surface 1b Annular sealing material 2 Sleeve 2a Cut 2b Peripheral extension 2g Positioning means (annular projection)

Claims (3)

[Claims] 1. A hose (H) is inserted into an outer peripheral surface (1a) of a nipple (1), and a sleeve (2) is formed along the outer periphery.
The hose (H) is shrunk in the radial direction by the tightening of the sleeve (2) to bring the inner peripheral surface (H1) of the hose (H) into close contact with the outer peripheral surface (1a) of the nipple (1). The cut (2a) formed over the entire length in the axial direction of (2) is partially provided with a circumferentially extending portion (2b) extending in the circumferential direction intersecting with the axial direction of the sleeve (2). Nipple (1) that abuts against 2b)
The hose joint characterized in that an elastically deformable annular sealing material (1b) protrudes from an outer peripheral surface (1a) of the hose joint. 2. A plurality of peripheral portions (2b) are partially provided over the entire length of the slit (2a), and these peripheral portions (2b) are provided.
2. The hose joint according to claim 1, wherein a plurality of annular sealing members (1b) are respectively provided to protrude in opposition to (b). 3. A nipple (1) on the sleeve (2).
3. The hose joint according to claim 1, further comprising positioning means (2g) for the hose joint.