JP2008101675A - Hose connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To securely seal a hose and an insert pipe with by suitably reducing a diameter of a sleeve. <P>SOLUTION: An annular recess 4 extending in a peripheral direction is formed along the outer peripheral surface 1a of the insert pipe 1, an annular seal material 5 elastically deformable is fitted in the annular recess 4, and held to be immovable in the axial direction, and the outer peripheral end of the annular seal material 5 is protruded from the outer peripheral surface 1a of the insert pipe 1, and pressure-contacts with the inner peripheral surface H1 of the hose H, and thereby, the hose inner peripheral surface H1 confronting a reduced diameter part 2a' is strongly pressed to the annular seal material 5 protruded from the outer peripheral surface 1a of the insert pipe 1 when the diameter of a sleeve outer cylindrical part 2a is reduced, and the hose inner peripheral surface H1 and the annular seal material 5 are strongly adhered to each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a hose connection structure for piping a hose to, for example, a beverage vending machine, a food machine, a chemical machine or a bathtub, a bathroom vanity, a water heater, a boiler, a solar water heater or a shower head.
Specifically, a sleeve is fitted on the outer side of a thin cylindrical insert pipe, and a hose is inserted between the outer peripheral surface of the insert pipe and the outer cylindrical portion of the sleeve. This invention relates to a hose connection structure in which the inner peripheral surface of the hose is closely attached to the outer peripheral surface of the nipple.

  Conventionally, as this type of hose connection structure, the inner cylinder part of the sleeve (double cylinder) is fitted and integrated along the outer peripheral surface of the insert pipe, and the outer cylinder part of this sleeve is integrated by closely contacting them. By caulking and reducing the diameter, the outer peripheral surface of the hose is deformed stepwise along the step between the end of the inner cylinder part and the insert pipe, and the fluid that intrudes along the inner peripheral surface of the hose at this step. There is one that can be stopped (for example, see Patent Document 1).

JP 2003-120877 A (page 3-4, FIG. 1)

However, in such a conventional hose connection structure, since the fluid is stopped at the step between the sleeve inner cylinder part and the insert pipe, if the thickness dimension of the sleeve inner cylinder part is thin, the step width is also reduced. If the diameter of the sleeve outer cylinder portion is not greatly reduced, there is a problem that leakage may occur.
Furthermore, since the inner peripheral surface of the synthetic resin hose is permanently plastically deformed by permanent strain due to long-term use and the elastic repulsive force decreases, a gap is generated between the steps, and leakage is likely to occur and the hose There is a problem in that it is easy to come off and cannot be used for a long time.

The invention according to the first aspect of the present invention aims to securely seal the hose and the insert pipe with an appropriate diameter reduction of the sleeve.
In addition to the object of the invention described in claim 1, the invention described in claim 2 aims to improve the pull-out strength of the hose and sleeve with a simple structure.
The invention described in claim 3 aims to simplify the sealing structure in addition to the object of the invention described in claim 1 or 2.

In order to achieve the above-described object, the invention according to claim 1 of the present invention forms an annular recess extending in the circumferential direction along the outer peripheral surface of the insert pipe, and an elastically deformable annular in the annular recess. The seal material is inserted and held in an axially immovable manner, and the outer peripheral end of the annular seal material is protruded from the outer peripheral surface of the insert pipe and is in pressure contact with the inner peripheral surface of the hose. It is.
According to a second aspect of the present invention, in the configuration of the first aspect of the invention, a concave groove is formed on the outer peripheral surface of the insert pipe, and a flange portion continuous with the sleeve outer cylinder portion is fitted into the concave groove to axially It is characterized by the addition of a configuration in which it cannot be moved.
The invention described in claim 3 is characterized in that a structure in which an annular recess is directly formed on the outer peripheral surface of the insert pipe by press working is added to the structure of the invention described in claim 1 or 2.

According to the first aspect of the present invention, an annular recess extending in the circumferential direction is formed along the outer peripheral surface of the insert pipe, and an annular seal material that can be elastically deformed is inserted into the annular recess to move in the axial direction. If the sleeve outer cylinder portion is reduced in diameter by holding the outer peripheral end of the annular seal member protruding from the outer peripheral surface of the insert pipe and press-contacting it with the inner peripheral surface of the hose while keeping it immovable. The inner peripheral surface of the hose facing the portion is strongly pressed against the annular sealing material protruding from the outer peripheral surface of the insert pipe, and the inner peripheral surface of the hose and the annular sealing material are in close contact with each other.
Therefore, the hose and the insert pipe can be reliably sealed with an appropriate diameter reduction of the sleeve.
As a result, it is possible to prevent leakage of the hose and the insert pipe only by appropriately reducing the diameter of the sleeve outer cylinder compared to the conventional one that stops the fluid at the step between the sleeve inner cylinder and the insert pipe. In this way, even if the inner peripheral surface of the hose is permanently strained due to long-term use and the elastic repulsion force decreases, the annular sealing material continues to be strongly crimped to it, so that no gap is generated, and there is no leakage or hose over the long term. It is possible to maintain a pipe connection without disconnection.

In addition to the effect of the invention of claim 1, the invention of claim 2 is formed with a concave groove on the outer peripheral surface of the insert pipe, and a flange portion continuous with the sleeve outer cylinder portion is fitted into the concave groove in the axial direction. By making it immovably integrated, the hose does not come off with the sleeve with respect to the insert pipe.
Therefore, the pull-out strength of the hose and the sleeve can be improved with a simple structure.
As a result, the structure of the sleeve can be simplified and the cost can be reduced and the hose pull-out strength can be increased compared to the conventional one in which the inner cylindrical portion of the sleeve is closely attached to the outer peripheral surface of the insert pipe. Therefore, it is not necessary to reduce the diameter of the sleeve very strongly, and no matter who performs the hose connection work regardless of the skill of the operator, it is possible to guarantee the hose disconnection and the prevention of water leakage over a long period of time.

According to the invention of claim 3, the annular recess is easily machined by directly forming the annular recess on the outer peripheral surface of the insert pipe by press working.
Therefore, the seal structure can be simplified.
As a result, cost can be reduced.

  1 to 6, the hose connection structure A of the present invention includes an insert pipe 1 that is inserted into the connection end of the hose H, a sleeve 2 that is inserted along the outer peripheral surface 1a of the insert pipe, A fastening means 3 for reducing the diameter of the sleeve 2, and by reducing the diameter of the outer cylindrical portion 2a of the sleeve 2 with the fastening means 3, the inner peripheral surface H1 of the connecting end of the hose H is connected to the insert pipe. It adheres to the outer peripheral surface 1a.

  The insert pipe 1 is formed into a thin cylindrical shape by pressing a plate material made of a deformable rigid material such as stainless steel or other molding, and at least only the inner peripheral surface 1b or the outer peripheral surface 1a. It is preferable to form a passivating film (not shown) on them by applying a passivating treatment to the whole.

  On the outer peripheral surface 1a on the axially proximal end side of the insert pipe 1, an engagement recess 1c that engages with an inner end 2c of a sleeve 2 described later is formed in an annular shape in the circumferential direction. The sleeve 2 is integrated with the insert pipe 1 so as not to move in the axial direction by engaging the engaging recess 2c and the engaging recess 1c in the axial direction.

  The sleeve 2 is composed of a caulking pipe that can be reduced in diameter and formed into a substantially cylindrical shape with a thin wall by pressing a deformable rigid material such as stainless steel or other forming process. An outer cylindrical portion 2a facing the outer peripheral surface H2 of the end portion and an annular flange portion 2b facing the cutting surface H3 of the hose H are integrally formed, and the insert pipe 1 is connected to the inner peripheral end of the flange portion 2b. The inner end 2c that engages with the engaging recess 1c in the axial direction is continuously formed.

  An annular concave portion 4 extending in the circumferential direction along the outer peripheral surface 1a of the insert pipe 1 is opposed to a reduced diameter portion 2a ′ of a sleeve 2 and a connecting end portion of the hose H, which will be described later, by pressing or the like. It is formed at the position to be.

  An elastically deformable annular seal material 5 made of an elastic material such as rubber is fitted into the annular recess 4, and the outer peripheral end of the annular seal material 5 is projected from the outer peripheral surface 1 a of the insert pipe 1. The arrangement positions of the annular recess 4 and the annular sealing material 5 are aligned so as to overlap in the radial direction with the reduced diameter portion 2a ′ of the sleeve 2 by the fastening means 3 described later.

  The insertion depth of the annular sealing material 5 with respect to the annular recess 4 is determined when the connecting end portion of the hose H is inserted into the annular space portion S defined between the insert pipe 1 and the sleeve outer cylinder portion 2a. It is preferable to arrange so that about half or more of the cross-sectional diameter of the annular sealing material 5 enters the annular recess 4 so that the annular sealing material 5 is not pushed in contact with the cut surface H3 of the hose H.

  As the tightening means 3 for reducing the diameter of the sleeve outer cylindrical portion 2a, for example, a drive-type or manual-type caulking machine or a similar device is used, and the inner end portion of the sleeve 2 is inserted into the engaging recess 1c of the insert pipe 1. After the 2c is engaged so as not to move in the axial direction, the connecting end portion of the hose H is inserted into the annular space S between the outer peripheral surface 1a of the insert pipe 1 and the sleeve outer cylindrical portion 2a. The sleeve outer tube portion 2a is crimped and tightened to plastically deform inward to form a reduced diameter portion 2a ′.

  Further, a connecting tool 6 for connecting to a hose connection port (not shown) of another device is provided at the axially proximal end portion of the insert pipe 1, and is connected to the outer peripheral surface of the hose connection port of the other device. When the threaded portion is engraved, the corresponding inner threaded portion 6a is engraved on the connecting tool 6, and when the inner threaded portion is engraved on the inner peripheral surface of the hose connection port, Corresponding external screw portions are carved into the connector 6.

The hose H is preferably made of a soft synthetic resin such as vinyl chloride or a soft material such as rubber so as to be elastically deformable, and has a flat inner peripheral surface H1 and outer peripheral surface H2.
Embodiments of the present invention will be described below with reference to the drawings.

  In the first embodiment, as shown in FIGS. 1A and 1B, an annular concave groove is directly formed as an engaging concave portion 1c on the base end side outer peripheral surface 1a of the insert pipe 1 by press working. The inner peripheral end of the flange portion 2b is inserted into the sleeve 1 as the inner end portion 2c of the sleeve 2, and the concave groove 1c and the inner peripheral end 2c of the flange portion 2b are integrated so as not to move in the axial direction. An annular recess 4 is formed directly on the outer peripheral surface 1a of the tip 1 by press working, and an annular sealing material 5 is fitted into the annular recess 4 so as to protrude. The diameter of the cylindrical portion 2a is reduced so that the hose inner circumferential surface H1 and the annular sealing material 5 are strongly adhered to each other.

  Specifically, the outer cylindrical portion 2a and the flange portion 2b of the sleeve 2 are formed so as to be substantially L-shaped in cross section by bending a single plate material, and the inner peripheral end 2c of the flange portion 2b is After being inserted into the recessed groove 1c of the insert pipe 1, the two are pressed together so as to be sandwiched from the outer position of the outer peripheral end 2d of the flange portion 2b and the inner position of the recessed groove 1c of the insert pipe 1. It is plastically deformed so that it cannot move in the axial direction.

By this pressing, the outer peripheral end 2d of the flange portion 2b may be partially recessed as shown in the example of the drawing.
If necessary, the sleeve outer cylindrical portion 2a may be provided with a through hole 2e for hose confirmation on the proximal end side in the axial direction so that the insertion position of the hose H can be confirmed through the through hole 2e. Is possible.

In the illustrated example, the caulking machine 3a of the tightening means 3 is provided with a plurality of caulking dies arranged at equal intervals in the circumferential direction around the sleeve outer cylindrical portion 2a so as to be reciprocally movable in the radial direction. A drive-type caulking machine that projects all the caulking dies at the same time is used, and linear so-called eight-way tightening is performed over substantially the entire axial length of the sleeve outer cylinder portion 2a.
As another example, a manual caulking machine in which a plurality of annular caulking dies are arranged at appropriate intervals in the axial direction of the sleeve outer cylindrical portion 2a is used, or a plurality of caulking dies are arranged in other structures. Thus, it is possible to crimp and tighten to other shapes.

In the case of the illustrated example, only one annular recess 4 is formed in the axial direction on the distal end side outer peripheral surface 1 a of the insert pipe 1, and this annular recess 4 and the annular sealing material 5 are formed on the reduced diameter portion 2 a ′ of the sleeve 2. Alignment is performed so as to overlap the axial center position in the radial direction.
As another example, a plurality of annular recesses 4 are formed at appropriate intervals in the axial direction on the outer peripheral surface 1a on the distal end side of the insert pipe 1, and the axial center positions of these annular recesses 4 and the annular sealing material 5 are reduced in diameter of the sleeve 2. It is also possible to align the portions 2a ′ so as to overlap with the axial center position in the radial direction.

  Further, the open end 1d on the distal end side in the axial direction of the insert pipe 1 is arranged so as to protrude forward of the distal end side in the hose disconnection direction from the open end 2f of the sleeve outer tube portion 2a, whereby the fastening means 3, when the outer peripheral surface H2 side of the connection end of the hose H is pressurized inward and elastically deformed, the bulge portion (bulge) H4 is inside the connection end of the hose H due to the elastic deformation of the hose H accompanying this compression deformation. It occurs only on the hose outer peripheral surface H2 side, not on the peripheral surface H1 side.

  A chamfered portion is formed on the outer edge portion of the insert pipe 1 by opening the open end 1d on the tip end side in the axial direction inward, and the open end 2f of the sleeve outer tube portion 2a is bent outward. For example, by forming a chamfered portion at the inner edge portion of the hose H, the hose H is bent so that the inner peripheral surface H1 and the outer peripheral surface H2 of the connection end of the hose H are in contact with each other or rubbed. I am doing so.

  Further, a nut is loosely inserted as a connection tool 6 into the axially proximal end portion of the insert pipe 1, and a convex portion 6 b protruding from one end opening of the nut 6 and a radial direction at the proximal end of the insert pipe 1. The nut 6 is rotatably locked by engaging with the flange portion 1e formed to protrude outward, and the nut 6 is rotated to rotate the inner screw portion 6a with the other nut 6a. It is made to connect with the hose connection port of another apparatus by screwing in the external thread part (not shown) of the hose connection port of an apparatus.

In the case of the illustrated example, the base end of the insert pipe 1 is bent so as to expand in a tapered shape, and a flange portion 1e is formed, and a tapered packing (not shown) is formed along the tapered flange portion 1e. It connects with the hose connection port of other equipment via.
As another example, as disclosed in Japanese Patent Application Laid-Open No. 2006-22840, the tip of the insert pipe 1 is bent at a substantially right angle to form a flange portion, and another disk is formed along the disc-shaped packing. It is also possible to connect with the hose connection port of the device.

Next, the hose connection method and operational effects of the hose connection structure A will be described.
First, the connecting end portion of the hose H cut to an appropriate length is inserted from the open end 1d of the insert pipe 1, and the annular space portion S opened between the outer peripheral surface 1a of the insert pipe 1 and the sleeve outer cylinder portion 2a. And is pushed in until the cut surface H3 of the hose H hits the flange portion 2b of the sleeve 2 or approaches it infinitely.

  At this time, the cut surface H3 of the hose H1 is connected to the flange portion 2b of the sleeve 2 while confirming the insertion position of the hose H through the hose confirmation through hole 2e opened on the axial base end side of the sleeve outer cylinder portion 2a. It is preferable to push it in until it abuts securely or approaches as much as possible.

  Thereafter, when the sleeve outer tube portion 2a is crimped by the caulking machine 3a of the tightening means 3, the outer peripheral surface H2 of the connecting end portion of the hose H is elastically compressed and deformed between the insert pipe 1 and the sleeve 2. The connecting end of the hose H is sealed so as not to move.

  Thereby, the hose H portion facing the reduced diameter portion 2a ′ of the sleeve outer cylinder portion 2a is compressed and deformed and pressed toward the outer peripheral surface 1a of the insert pipe 1, and the inner peripheral surface H1 of the hose is Crimp to the outer peripheral surface 1a.

  Along with the pressure bonding, the portion facing the annular seal member 5 protruding from the outer peripheral surface 1a of the insert pipe 1 on the hose inner peripheral surface H1 is compressed more strongly than the other portions, so that it is compressed and deformed more and seal strength is increased. Becomes higher.

Accordingly, if the sleeve outer cylinder portion 2a is appropriately crimped and reduced in diameter by a caulking machine of the tightening means 3, even if the hose inner peripheral surface H1 is permanently strained and the elastic repulsion is lowered by long-term use, Since the sealing material 5 is strongly pressure-bonded, the hose inner peripheral surface H1 and the outer peripheral surface 1a of the insert pipe 1 can be reliably sealed, and the hose can be prevented from coming off by the frictional resistance with the annular sealing material 5.
Therefore, anyone can make a pipe connection without leakage or hose disconnection regardless of the skill of the operator.

  Furthermore, if the open end 1d on the distal end side in the axial direction of the insert pipe 1 is arranged so as to protrude forward from the open end 2f of the sleeve outer tube portion 2a in the hose removal direction, the hose H by the tightening means 3 is provided. Due to the elastic deformation of the connecting end, the bulging portion H4 occurs only on the hose outer peripheral surface H2 side, and the hose inner peripheral surface H1 side is flat, so that an increase in pipe resistance due to pressure insertion of the hose H can be prevented. In addition, there is also an advantage that it is possible to reliably prevent residues from remaining when food such as beverages is passed.

  In the second embodiment, as shown in FIG. 2, an annular recess 4 is formed directly on the outer peripheral surface 1 a of the distal end side of the insert pipe 1 by pressing, and the hose is axially proximal with the annular recess 4 interposed therebetween. The configuration shown in FIG. 1 is such that the outer peripheral surface 1a 'on the back side in the insertion direction has a step so as to have a larger diameter than the outer peripheral surface 1a' 'on the front side in the hose insertion direction, which is the front end in the axial direction. Unlike the first embodiment, the other configuration is the same as that of the first embodiment shown in FIG.

  Accordingly, the second embodiment shown in FIG. 2 not only provides the same operational effects as the first embodiment shown in FIG. 1, but also adds an annular space portion between the insert pipe 1 and the sleeve outer cylinder portion 2a. When the connecting end portion of the hose H is inserted into S, the annular sealing material 5 is difficult to be pushed in contact with the cut surface H3 of the hose H, thereby preventing deterioration of the sealing performance due to the positional deviation of the annular sealing material 5 In addition, there is an advantage that the connecting end of the hose H can be easily inserted along the outer peripheral surface 1a ″ on the near side of the small-diameter hose insertion direction, thereby improving workability.

  In the third embodiment, as shown in FIGS. 3 (a) and 3 (b), an annular recess 4 is directly formed on the outer peripheral surface 1a of the distal end side of the insert pipe 1 by pressing, and the annular recess 4 is formed in the axial base end. Unlike the first embodiment shown in FIG. 1, the configuration in which the annular sealing material 5 is difficult to move in the same direction, such as by being deformed to the back side in the hose insertion direction, which is the side, is different from that in FIG. It is the same as the first embodiment shown in FIG.

  Accordingly, the third embodiment shown in FIG. 3 not only provides the same operational effects as the first embodiment shown in FIG. 1, but also adds an annular space portion between the insert pipe 1 and the sleeve outer cylinder portion 2a. When the connecting end portion of the hose H is inserted into S, the annular sealing material 5 is difficult to be pushed in contact with the cut surface H3 of the hose H, and the deterioration of the sealing performance due to the positional deviation of the annular sealing material 5 is prevented. Compared to the second embodiment shown in FIG. 2, there is an advantage that the connecting end portion of the hose H is brought into contact with the outer peripheral surface 1 a of the insert pipe 1 and can be smoothly inserted without being caught on the way.

  Further, in the illustrated example, the flange portion 2b of the sleeve 2 is bent into a cross-sectionally U-shape as shown by a one-dot chain line in FIG. 3 (a) before being fitted into the concave groove 1c of the insert pipe 1. A step portion 1c 'having a diameter larger than the inner diameter is formed so as to protrude toward the axial base end side of the groove 1c, and the inner peripheral end 2c of the flange portion 2b is inserted along the outer peripheral surface 1a of the insert pipe 1. Then, by abutting against the stepped portion 1c ', as shown by a solid line in FIG. 3A, it is bent and deformed into an L-shaped cross section and is fitted in the groove 1c so as to be immovable in the axial direction.

  As a result, there is no need to press the outer peripheral end 2d of the flange portion 2b and the inner position of the recessed groove 1c of the insert pipe 1 as in the first and second embodiments. There is also an advantage that the cost can be reduced by improving the performance.

  In the fourth embodiment, as shown in FIGS. 4 (a) and 4 (b), an inner cylindrical portion substantially parallel to the outer cylindrical portion 2a is formed in a double cylindrical shape as the inner end portion 2c of the sleeve 2, and this sleeve The inner pipe portion 2c is inserted and overlapped to the outer peripheral surface 1a on the proximal end side of the insert pipe 1, and the overlap portion is pressed inward from the sleeve inner cylinder portion 2c side to reduce the diameter, thereby inserting the insert pipe. 1 is different from the first embodiment shown in FIG. 1 in that the engagement concave portion 1c is formed on the base end side outer peripheral surface 1a of the first sleeve and the sleeve inner cylindrical portion 2c is locked so as not to move in the axial direction. The rest of the configuration is the same as that of the first embodiment shown in FIG.

  Specifically, the outer cylindrical portion 2a, the flange portion 2b, and the inner cylindrical portion 2c of the sleeve 2 are formed so as to be continuous in a substantially U-shaped cross section by bending a single plate material. The outer peripheral portion of the sleeve outer cylindrical portion 2a, the inner cylindrical portion 2c and the insert pipe 1 is reduced by reducing the diameter of the overlapping portion of the outer peripheral surface 1a of the insert pipe 1 from the sleeve inner cylindrical portion 2c side. An annular space S that is partitioned from the surface 1a is partitioned.

  Further, as the tool B for reducing the diameter of the overlapped portion, for example, as shown by a one-dot chain line in FIG. 4A, the inner peripheral surface of the front end side of the cylindrical body substantially the same as the thickness dimension of the connecting end portion of the hose H The diameter-reduced tool B formed with a tapered inclined surface B1 that gradually increases in diameter toward the tip is formed in the annular space S that opens between the sleeve outer tube portion 2a and the sleeve inner tube portion 2c. If the tapered inclined surface B1 is pressed against the sleeve inner cylindrical portion 2c, the diameter can be reliably reduced and deformed even if the pressure input of the diameter reducing tool B is small.

  Further, the annular seal is arranged so that the axial length dimension of the overlapped portion to be reduced in diameter is shorter than the axial length dimension of the outer peripheral surface 1a on the distal end side of the insert pipe 1 adjacent thereto. It is preferable to increase the contact area between the distal end side outer peripheral surface 1a of the insert pipe 1 on which the material 5 is disposed and the hose inner peripheral surface H1 as much as possible.

  And after inserting the connection end part of the hose H in the annular space part S opened between the said sleeve outer cylinder part 2a, the inner cylinder part 2c, and the outer peripheral surface 1a of the insert pipe 1, after the fastening means 3, By crimping the sleeve outer cylindrical portion 2a to reduce the diameter, the inner peripheral surface H1 of the hose and the annular sealing material 5 protruding from the annular recess 4 formed directly on the insert pipe 1 by pressing are strongly adhered. Yes.

In the case of the illustrated example, a manual caulking machine 3b in which a plurality of annular caulking dies are arranged at appropriate intervals in the axial direction of the sleeve 2 is shown as the tightening means 3. If the machine is used, the hose can be connected on site.
As another example, so-called eight-way tightening can be performed using a drive-type caulking machine 3a as shown in FIG.

  Therefore, the fourth embodiment shown in FIG. 4 not only achieves the same operational effects as the first embodiment shown in FIG. 1 but also has a reduced diameter from the sleeve inner cylinder portion 2c side in addition to the insert. Since destruction of the passive film applied to the inner peripheral surface 1b of the pipe 1 is prevented, there is an advantage that generation of rust and mixing of rust into the fluid can be prevented over a long period of time.

  Furthermore, since the overlapping portion of the sleeve inner cylinder portion 2c and the outer peripheral surface 1a on the proximal end side of the insert pipe 1 is reinforced compared to other portions, the connecting end portion of the hose H is strongly applied by the tightening means 3. Since the sleeve 2 is locked so as not to be retractable in the hose disconnection direction by the engaging recess 1c portion 1c of the insert pipe 1 having a reduced diameter, the force acts on the hose H in the disconnection direction. However, there is also an advantage that the sleeve 2 cannot be removed from the insert pipe 1.

  Further, as shown in the drawing, if the axial length dimension of the overlapped portion to be reduced in diameter is arranged to be shorter than the axial length dimension of the outer peripheral surface 1a on the distal end side of the insert pipe 1 adjacent thereto. Moreover, since the contact area of the front end side outer peripheral surface 1a of the insert pipe 1 in which the annular sealing material 5 is disposed and the hose inner peripheral surface H1 is increased as much as possible, there is also an advantage that the pull-out strength of the hose H can be further improved.

  In the fifth embodiment, as shown in FIGS. 5 (a) and 5 (b), the inner cylinder portion corresponding to the inner end portion 2c of the sleeve 2 is folded back into a plurality of layers, and the base end side outer peripheral surface 1a of the insert pipe 1 is formed. Overlap, by pressing the overlapped portion radially inward from the sleeve inner cylindrical portion 2c side to reduce the diameter, an engagement recess 1c is formed on the outer peripheral surface 1a on the proximal end side of the insert pipe 1, The sleeve inner cylindrical portion 2c is locked so as not to move in the axial direction, and the sleeve inner cylindrical portion 2c folded back into the plurality of layers and the engagement concave portion 1c of the insert pipe 1 form an annular concave portion 4, and this annular Unlike the fourth embodiment shown in FIG. 4, the configuration in which the annular sealing material 5 is inserted into the recessed groove 4 so as to protrude is the same as the fourth embodiment shown in FIG. is there.

  Specifically, the outer cylinder portion 2a and the flange portion 2b of the sleeve 2 and the inner cylinder portion 2c folded back into a plurality of layers are formed so as to be continuous in a substantially U-shaped cross section by bending one plate material. The inner tube portion 2c folded back into a plurality of layers and the insert pipe 1 are engaged by reducing the diameter of the overlapping portion of the sleeve inner tube portion 2c and the base end side outer peripheral surface 1a of the insert pipe 1 An annular recessed portion 4 into which the annular sealing material 5 protrudes and is inserted is defined between the recessed portion 1c and the front end side step portion 1c '.

  And after inserting the connection end part of the hose H in the annular space part S opened between the said sleeve outer cylinder part 2a, the inner cylinder part 2c, and the outer peripheral surface 1a of the insert pipe 1, after the fastening means 3, By caulking the sleeve outer cylinder portion 2a and reducing the diameter, the hose inner peripheral surface H1 and the annular sealing material 5 protruding from the annular concave portion 4 formed along the outer peripheral surface 1a of the insert pipe 1 are closely attached. I am letting.

  In the case of the illustrated example, the inner cylindrical portion 2c of the sleeve 2 is folded back and overlapped twice, but can be folded back and stacked further, and the fastening means 3 is shown in FIG. Although such a manual caulking machine 3b is used, it is also possible to use a driving caulking machine 3a as shown in FIG.

  Accordingly, the fifth embodiment shown in FIG. 5 not only obtains the same operation and effect as the fourth embodiment shown in FIG. 4, but in addition to that, the sleeve inner cylindrical portion 2c folded into a plurality of layers and the insert pipe. By reducing the diameter of the overlapped portion with the outer peripheral surface 1a of 1, the annular recess 4 is formed at the same time as these are integrated. Therefore, the insert pipe 1 is separately processed by pressing as in Example 4 shown in FIG. Since it is not necessary to form the annular recess 4 directly, there is an advantage that the cost can be reduced accordingly.

  In the sixth embodiment, as shown in FIGS. 6 (a) and 6 (b), the inner cylindrical portion corresponding to the inner end 2c of the sleeve 2 is folded back into a plurality of layers, and the outer peripheral surface 1a on the proximal end side of the insert pipe 1 is formed. The base end side outer peripheral surface 1a of the insert pipe 1 is expanded by pressing and expanding the portion on the distal end side in the axial direction from the overlapped portion from the inner peripheral surface 1b side of the insert pipe 1 radially outward. The sleeve inner cylinder portion 2c is locked so as not to move in the axial direction, and the sleeve inner cylinder portion 2c folded back into the plurality of layers and the engagement recess portion 1c form an annular recess 4c. 5 is different from the fifth embodiment shown in FIG. 5 except that the annular sealing material 5 is inserted into the annular groove 4 so as to protrude. Same as Example 5.

  Specifically, the insert pipe 1 on the distal end side in the axial direction of the overlapping portion of the sleeve inner cylindrical portion 2c and the outer peripheral surface 1a on the proximal end side of the insert pipe 1 is expanded into a plurality of layers by tapering the insert pipe 1 into a taper shape. An annular recess 4 into which the annular seal material 5 protrudes and is inserted is defined between the inner cylinder portion 2c and the engagement recess 1c of the insert pipe 1 and the front end side step portion 1c '.

  Therefore, in Example 6 shown in FIG. 6, in order to expand a part of the insert pipe 1, a passivation film is formed by applying a passivation process to the inner peripheral surface 1 b of the insert pipe 1 in contact with the fluid in advance. If the diameter of the insert pipe 1 is increased, the passive film on the inner surface may be expanded and deformed to crack and partially break. However, the following operations are the same as those of the embodiment 5 shown in FIG. An effect is obtained.

In the preceding embodiment, a nut is rotatably engaged as a connecting tool 6 with a flange 1e formed to project radially outward from the axial base end of the insert pipe 1, and the nut 6 can be rotated. Then, by screwing the inner screw portion 6a to the outer screw portion of the hose connection port of another device, the inner screw portion 6a is connected to the hose connection port of the other device. An external thread portion may be formed on the axial base end portion of the pipe 1 and may be coupled by being screwed into an internal thread portion of a hose connection port of another device by the rotation operation.
Further, the flange portion 2b bent in a cross-sectional shape only in the third embodiment is inserted along the outer peripheral surface 1a of the insert pipe 1 and abutted against the stepped portion 1c 'to bend and deform into an L-shaped cross section. Thus, the groove 1c and the groove 1c are fitted so as not to move in the axial direction. However, the present invention is not limited to this, and the same can be applied to the first and second embodiments.

It is a partially notched front view of the hose connection structure which shows Example 1 of this invention, (a) shows the state before hose connection, (b) has shown the state after hose connection. It is a partially cutaway front view of the hose connection structure which shows Example 2 of this invention, and has shown the solid line in the middle of hose insertion. It is a partially notched front view of the hose connection structure which shows Example 3 of this invention, (a) shows the state before hose connection, (b) has shown the state after hose connection. It is the partially notched front view of the hose connection structure which shows Example 4 of this invention, (a) shows the state before hose connection, (b) has shown the state after hose connection. It is the partially notched front view of the hose connection structure which shows Example 5 of this invention, (a) shows the state before hose connection, (b) has shown the state after hose connection. It is the partially notched front view of the hose connection structure which shows Example 6 of this invention, (a) shows the state before hose connection, (b) has shown the state after hose connection.

Explanation of symbols

A Hose connection structure B Reduced diameter tool B1 Tapered inclined surface H Hose H1 Inner peripheral surface (connection end inner peripheral surface) H2 Outer peripheral surface (connection end outer peripheral surface)
H3 Cut surface H4 Swelling portion S Annular space 1 Insert pipe 1a Outer peripheral surface 1a 'Outer peripheral surface 1a "Outer peripheral surface in the hose insertion direction Front outer peripheral surface 1b Inner peripheral surface 1c Engaging recess 1c' End side step Part 1d open end 1e collar part 2 sleeve 2a outer cylinder part 2b flange part 2c inner end part (inner peripheral end, inner cylinder part)
2d Open end 2e Through-hole 3 Tightening means 3a, 3b Caulking machine 4 Annular recess 5 Annular seal 6 Connection tool (nut) 6a Internal thread 6b Convex

Claims (3)

The sleeve (2) is fitted on the outer side of the insert pipe (1) formed into a thin cylindrical shape, and the outer peripheral surface (1a) of the insert pipe (1) and the outer cylinder part (2a) of the sleeve (2) Hose (H) is inserted between the hose (H) and the sleeve outer cylinder (2a) is reduced in diameter so that the inner peripheral surface (H1) of the hose (H) is in close contact with the outer peripheral surface of the nipple (1). In structure
An annular recess (4) extending in the circumferential direction is formed along the outer peripheral surface (1a) of the insert pipe (1), and an elastically deformable annular seal material (5) is inserted into the annular recess (4). The outer peripheral end of the annular seal member (5) protrudes from the outer peripheral surface (1a) of the insert pipe (1), and the inner peripheral surface (H1) of the hose (H). A hose connection structure characterized by being pressed against the hose. A concave groove (1c) is formed in the outer peripheral surface (1a) of the insert pipe (1), and a flange portion (2b) continuous with the sleeve outer cylindrical portion (2a) is fitted into the concave groove (1c) in the axial direction. The hose connection structure according to claim 1, wherein the hose connection structure is integrated so as to be immovable. The hose connection structure according to claim 1 or 2, wherein an annular recess (4) is directly formed on the outer peripheral surface (1a) of the insert pipe (1) by pressing.

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