JP4868371B2 - Hose fittings - Google Patents

Description

The present invention relates to a hose joint used for pipe connection of a soft and easily deformable hose such as silicone rubber.
More specifically, the present invention relates to a hose joint in which a hose is inserted along the outer peripheral surface of the nipple and the inner peripheral surface of the hose is in close contact with the outer peripheral surface of the nipple by the axial movement of a fastening tool provided outside the nipple.

Conventionally, this type of hose joint includes a nut connected to a second joint configured as a nipple, and a front disposed between the inner peripheral surface of the rear end of the female screw and the front end of the hose. A ring, a back ring interposed between the rear end inner peripheral surface of the nut and the outer peripheral surface of the hose at a predetermined distance from the front ring, and an inner portion on the hose end side in a state of being connected to the second joint. There is an insert sleeve that is inserted into the peripheral surface and sandwiches the inner and outer peripheral surfaces on the hose end side together with a front ring or a back ring (see, for example, Patent Document 1).
At the time of connection, first, with the buckling engaged with the nut, insert the buckling into the outer periphery of the hose together with the nut and then set it back, and then insert the insert sleeve into the end of the hose. The sleeve is fitted to the second joint, and the front ring fitted to the outer periphery of the hose end is fitted to the second joint. Then, by screwing the nut to the second joint, the back ring is drawn to the front ring side, and the outer periphery of the hose that is fitted on the annular convex portion of the insert sleeve or both curved slopes thereof is the front ring. In addition, the portion that is swelled and deformed in the radial direction by the annular convex portion is clamped in the axial direction by the front ring or the back ring.

Registered Utility Model No. 3088531

However, in such a conventional hose joint, if the hose end is fitted into the insert sleeve and then the front ring is fitted, and then the insert sleeve is not fitted to the second joint, the nut is screwed. Since it cannot be performed, there is a problem that connection work takes time and workability is inferior, and connection cannot be made in a short time.
Further, due to the fitting between the insert sleeve and the second joint, a gap is formed between the communication hole formed in the inner periphery of the insert sleeve and the communication hole of the second joint, and fluid enters the gap. Since liquid accumulation occurs, it is easy to become unsanitary, and the outer periphery of the fitting sleeve of the insert sleeve is liquid-tightly fitted into the large-diameter stepped fitting hole of the second joint via the O-ring. The fluid that has entered the gap between the communication hole of the insert sleeve and the communication hole of the second joint also comes into contact (wetted) with the O-ring.
Therefore, the insert sleeve and the second joint are integrated in advance, the hose is inserted along the annular convex portion of the insert sleeve, and the end of the hose is inserted into the front ring waiting in a fixed position, thereby It is conceivable to shorten the process up to the screwing, and to be able to select the type and application of the fluid without being affected by the problem of liquid accumulation in the communication path or liquid contact with the O-ring.
However, in this case, since the inner diameter of the front ring is formed to be substantially the same as the outer diameter of the hose, it is difficult to fit the end of the hose into the front ring only by pushing the hose. There is a possibility that the nut is screwed in a state where the nut is not pushed into the fixed position securely. If the nut is screwed in such a manner that the hose end portion is not fitted in the front ring in this way, a reliable connection cannot be made, resulting in a problem that the sealing performance and the disconnection strength between the outer peripheral surface of the insert sleeve and the hose are lowered. is there.

An object of the present invention is to cope with such a problem, and stabilizes the push-in position of the hose tip to improve the sealing performance and pull-out strength between the outer peripheral surface of the nipple and the hose, and to fix the hose in place. until possible to reliably insert, possible to further improve the sealing properties and the pull-out strength between the outer peripheral surface and the hose nipple, possible to reliably sandwich the hose in the axial and radial directions, it is an object like.

In order to achieve such an object, according to the present invention, the hose is inserted along the outer peripheral surface of the nipple, and the inner peripheral surface of the hose is moved to the outer periphery of the nipple by the axial movement of the fastening tool provided on the outer side. a hose fitting that is in close contact with the surface, the diverging surface gradually enlarged to hose insertion direction and the outer peripheral surface is bulged portion of the annular having a reduced diameter surface gradually reduced in diameter from its maximum diameter portion The formed nipple, and the expansion and contraction sleeve that is elastically deformable in the radial direction and is provided opposite to the diameter-reduced surface of the bulging portion and the outer peripheral surface located on the back side in the hose insertion direction than the diameter-reduced surface; , provided face the outer peripheral surface of the front Symbol scaling sleeve, said clamp pressing face is formed on the inside for pressing in so that reducing the diameter of the scaling sleeve with the axial movement against the nipple wherein the nipple, the Rise A rear-side outer peripheral surface formed on the back side in the hose insertion direction with respect to the reduced diameter surface of the part, an annular step portion formed on the rear side in the hose insertion direction with respect to the back-side outer peripheral surface, and an outer side of the annular step portion A cylindrical portion that is formed to face the outer peripheral surface, and the expansion / contraction sleeve includes an inlet portion that is formed to face the reduced diameter surface, and a hose insertion direction relative to the inlet portion. A cylindrical expansion / contraction portion formed on the back side so as to face the back outer peripheral surface, and along the annular stepped portion from the back end in the hose insertion direction of the cylindrical expansion / contraction portion toward the back outer peripheral surface. An annular flange formed so as to be opposed to the front end surface of the hose, and a stopper formed so as to protrude from the outer peripheral surface of the cylindrical expansion / contraction portion so as to be opposed to the front end edge of the cylindrical portion. , the inner diameter of the inlet portion and the tubular scaling unit, upon insertion of the hose, the bulging portion The bulge portion is set so as to be larger than the outer diameter of the hose inserted along the reduced diameter surface, and when the expansion / contraction sleeve is pressed by the pressing surface portion in accordance with the axial movement of the fastening tool. Set to be smaller than the outer diameter of the hose inserted along the reduced diameter surface of the stopper, the axial direction from the hose insertion direction back side protruding surface of the stopper to the hose insertion direction back side end of the annular flange The dimension and the axial dimension from the front end edge of the cylindrical part to the annular step part are set to coincide with each other.

In addition to the above-described features, the inlet portion and the cylindrical expansion / contraction portion of the expansion / contraction sleeve can be elastically deformed in the radial direction by forming slits extending in the axial direction in the inlet portion and the cylindrical expansion / contraction portion. as well as to the to the inlet portion of the expansion sleeve, forming an annular convex portion facing the outer peripheral surface of the hose, the inner diameter of the annular convex portion, during insertion of the hose the shrinkage of the bulging portion The annular convex portion is set so as to be larger than the outer diameter of the hose inserted along the radial surface, and when the expansion / contraction sleeve is pressed by the pressing surface portion along with the axial movement of the fastening tool. inner diameter, characterized by being set to be smaller than the outer diameter of the hose to be inserted along the reduced diameter surface of the bulging portion of the.

In addition to the features discussed above, the inner peripheral surface of said fastener, separate the pressing tube portion formed so as to face the diverging surface of the bulging portion with the axial movement of the fastening member Alternatively, it is provided integrally and opposed to the annular space formed between the end surface on the hose insertion direction side of the pressing cylinder and the end surface on the anti-hose insertion direction side of the expansion / contraction sleeve in a tightened state by the axial movement of the tightening tool. An engaging recess is formed as described above.

In the present invention having the above-described features, when the hose is inserted, the inner diameter of the inlet portion facing the reduced diameter surface of the expansion / contraction sleeve is set larger than the outer diameter of the hose inserted along the reduced diameter surface of the bulging portion. By doing so, the distal end portion of the hose can smoothly enter between the expansion / contraction sleeve and the diameter-reduced surface without being in contact with the inlet portion of the expansion / contraction sleeve, and can be inserted to a fixed position. After that, when the clamping tool is pressed by the pressing surface portion in the axial direction, the inner diameter of the inlet portion of the expansion / contraction sleeve is set smaller than the outer diameter of the hose inserted along the reduced diameter surface of the bulging portion. Thus, the hose is sandwiched between the inlet portion of the expansion / contraction sleeve and the reduced diameter surface of the nipple, so that the pushing position of the tip of the hose can be stabilized to improve the sealing performance and the pulling strength between the outer peripheral surface of the nipple and the hose it can.
As a result, the workability of the hose connection is improved, and anyone can easily and reliably perform the hose connection work in a short time.
In addition, compared to the conventional type in which a gap is formed in the middle of the communication path, no liquid pool or liquid contact with the O-ring occurs in the middle of the communication path formed along the inner peripheral surface of the nipple. Yes, regardless of the type and application of the fluid, the degree of freedom increases and it is easy to use.
In addition, since an annular flange portion facing the tip end surface of the hose is formed at the end portion of the expansion / contraction sleeve in the hose insertion direction toward the outer peripheral surface of the nipple, the outer peripheral surface of the nipple is On the other hand, by setting the expansion / contraction sleeve, an insertion space for the hose is formed between the outer peripheral surface of the back side and the inner peripheral surface of the expansion / contraction sleeve. Since no further hose H can be inserted, the hose can be reliably inserted to a fixed position.
As a result, a reliable connection can be made.

  Further, the expansion / contraction sleeve is formed so as to gradually increase in diameter in the direction opposite to the hose insertion direction, and a slit extending in the axial direction is notched to enable elastic deformation in the radial direction. An annular convex portion facing the outer peripheral surface of the hose is formed at the inlet portion of the sleeve, and the inner diameter of the annular convex portion is inserted along the reduced diameter surface of the bulging portion when the hose is inserted. It is set to be larger than the outer diameter of the hose, and when the expansion / contraction sleeve is pressed by the pressing surface portion with the axial movement of the fastening tool, it is inserted along the reduced diameter surface of the bulging portion. When the hose is set to be smaller than the outer diameter of the hose, the inner periphery of the expansion / contraction sleeve does not come into contact with the annular convex portion that becomes the inlet portion of the expansion / contraction sleeve when the hose is inserted. Face and diameter reduction And the inner peripheral surface and the inner peripheral surface of the nipple and the inner peripheral surface and the inner peripheral surface of the nipple. At the same time as the hose is sandwiched in the radial direction, the annular convex part bites into the outer peripheral surface of the hose and is further strongly sandwiched between the reduced diameter surface of the nipple, so the seal between the outer peripheral surface of the nipple and the hose Property and pull-out strength can be further improved.

In addition, a pressing cylinder portion formed so as to face the enlarged surface of the bulging portion as the axial movement of the fastening tool is provided separately or integrally on the inner peripheral surface of the fastening tool. An engagement recess is formed so as to face an annular space formed between the end surface on the hose insertion direction side of the pressing cylinder portion and the end surface on the anti-hose insertion direction side of the expansion / contraction sleeve in a tightened state due to axial movement of the tool. When formed, the hose is sandwiched in the radial direction between the enlarged diameter surface of the bulging portion and the pressing tube portion by the axial movement of the fastening tool, and at the same time, the outer peripheral surface of the hose becomes the pressing tube portion. The outer peripheral surface of the hose that bulges and deforms toward the engagement recess through an annular space formed between the end surface on the hose insertion direction side and the anti-hose insertion direction side end surface of the expansion / contraction sleeve. Will be in close contact with and pressed against the engagement recess. It is possible to reliably sandwich the scan in the axial and radial directions.
As a result, even when the hose is soft and easily deformed, for example, like a silicone hose, the hose deformation can be used to improve the sealing performance and the disconnection strength.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal front view which shows the hose coupling which concerns on embodiment of this invention, (a) shows the state before hose insertion, (b) shows the state after hose insertion, (c) is the time of the movement start of a fastener. (D) shows the state after the end of movement of the fastener. It is the same perspective view, (a) shows the state before hose insertion, (b) shows the state after hose insertion, (c) shows the state at the time of the movement start of a fastener, (d) is tightening The state after the movement of the tool is shown. It is a vertical front view which shows the decomposition | disassembly state of the hose coupling which concerns on embodiment of this invention. It is the same perspective view, (a) has shown the whole decomposition | disassembly state, (b) has shown the state which looked only at the expansion / contraction sleeve from the reverse direction.

  The embodiment of the hose joint A of the present invention is, as shown in FIGS. 1 to 4, a nipple 1 into which a connecting end portion of a flexible hose H is inserted and reciprocally movable in the axial direction with respect to the nipple 1. A clamp 2 provided; and an expansion / contraction sleeve 3 disposed on the outer peripheral surface of the nipple 1 via the connection end of the hose H; and after the connection end of the hose H is inserted into the outer peripheral surface of the nipple 1, By moving the fastening tool 2 in the axial direction, for example, the insertion direction of the hose H (hereinafter referred to as the hose insertion direction) to reduce the diameter of the expansion / contraction sleeve 3, the inner peripheral surface H1 of the connection end of the hose H is The hose H is connected to the outer peripheral surface so as not to be pulled out.

  The nipple 1 is a hard material such as a metal such as brass or a hard synthetic resin, and is formed in a cylindrical shape having an outer diameter substantially the same as or slightly larger than the inner diameter of the hose H, or a deformation such as stainless steel. A plate made of a possible rigid material is formed into a thin cylindrical shape by pressing or other forming processes, and its outer peripheral surface is gradually expanded in the hose insertion direction and gradually from its maximum diameter portion. An annular bulge portion 1a formed so as to be reduced in diameter is formed.

The annular bulging portion 1a includes a diameter-enlarging surface 1a1 that gradually increases in diameter from the tip edge 1b in the direction opposite to the hose insertion direction of the nipple 1 (hereinafter referred to as the anti-insertion direction) and the maximum of the diameter-enlarging surface 1a1. The diameter-reduced surface 1a2 that gradually decreases in diameter from the diameter portion in the hose insertion direction is continuously arranged, and in the example shown in FIGS. 1 to 4, a tapered surface that is linearly inclined is used. For example, it can be inclined in a curved surface.
On the back side in the hose insertion direction from the reduced diameter surface 1a2 of the bulging portion 1a, a back outer peripheral surface 1c having the same diameter as the minimum diameter portion of the reduced diameter surface 1a is formed in a predetermined length in the hose insertion direction.

  On the inner peripheral surface of the tip of the nipple 1, an inversely tapered surface 1d that gradually increases in diameter toward the tip is formed. In the example shown in FIG. 1 (d), the nipple 1 is tightened by a fastening tool 2 described later. The hose H is pushed inward by the pressing cylinder portion 4 so that the pressing cylinder portion 4 to be described later protrudes from the tip edge 1b of the rim 1 so that the inner end portion thereof is continuous with the reverse tapered surface 1d of the nipple 1. It is preferable to arrange.

Further, an annular step portion 1e that protrudes substantially perpendicularly from the outer peripheral surface 1c is integrally formed on the inner side in the hose insertion direction from the inner peripheral surface 1c of the nipple 1, and on the outer side of the annular step portion 1e. A sliding means 1f is formed for supporting a fastening tool 2 described later so as to be reciprocally movable in the hose insertion direction and the hose insertion direction and the anti-insertion direction.
Further, on the outer peripheral surface of the nipple 1, as a non-slip means 1g for rotating operation, for example, as shown in FIG. 2 and FIG. It is preferable to form a plurality of them, or to form other uneven portions such as knurls.

The fastening tool 2 is formed in a substantially cylindrical shape having the inner diameter larger than the outer diameter of the hose H with the same or different material as the nipple 1, and the inner peripheral surface thereof is engaged with the sliding means 1 f of the nipple 1. Slide means 2a is formed to support the hose insertion direction and the reverse insertion direction so as to be reciprocally movable.
As the sliding means 1f of the nipple 1 and the sliding means 2a of the fastening tool 2, a screw which relatively reciprocates in the hose insertion direction and the anti-insertion direction by rotating the fastening tool 2 relative to the nipple 1 is used. It is preferable to form.
As another example, the nipple 1 and the fastening tool 2 can be brought into surface contact and moved in the hose insertion direction, so that they can be engaged so as to be immovably locked.

Further, inside the fastening tool 2, there is provided means for pressing and reducing the diameter of a cylindrical expansion / contraction portion 3 e of the expansion / contraction sleeve 3, which will be described later, with the axial movement of the fastening tool 2 with respect to the nipple 1.
As the sleeve diameter-reducing means, it is preferable to directly form the pressing surface portion 2b inclined in a taper shape in which the inner diameter gradually decreases in the anti-insertion direction on the inner peripheral surface of the fastening tool 2.
As another example, a pressing sleeve is rotatably provided on the inner side (inner periphery) of the fastening tool 2, and the inner peripheral surface of the pressing sleeve is opposed to the outer peripheral surface of a cylindrical expansion / contraction portion 3e of the expansion / contraction sleeve 3 described later. And it is also possible to set it as the press surface part which inclines in the taper shape from which an internal diameter becomes small gradually toward an anti-insertion direction.

  On one end side in the anti-insertion direction on the inner peripheral surface of the fastening tool 2, a pressing cylinder part 4 formed so as to face the enlarged surface 1 a 1 of the bulging part 1 a as the fastening tool 2 moves in the axial direction is separately provided. The hose insertion direction side end surface of the pressing cylinder portion 4, that is, the back side end surface 4 a, and the anti-hose insertion direction side end surface of the expansion / contraction sleeve 3 to be described later, The engaging recess 2c is preferably formed so as to face the annular space S formed between the inlet side end surface 3b.

  Further, on the outer peripheral surface of the fastening tool 2, as a non-slip means 2d for rotating operation, as in the example shown in FIG. 2 and FIG. It is preferable to form a plurality of protrusions, and to form uneven portions such as knurls.

The expansion / contraction sleeve 3 is formed in a substantially cylindrical shape by an elastically deformable material such as a polyacetal resin or a synthetic resin having excellent surface slipperiness and heat resistance, and is inserted into the annular step portion 1e of the nipple 1. In this way, the nipple 1 is disposed so as to face the reduced diameter surface 1a2 and the rear outer peripheral surface 1c, and in particular, the inlet portion 3a is a portion opposite to the hose insertion direction facing the reduced diameter surface 1a2.
Further, as shown in FIGS. 1A to 1C, the expansion / contraction sleeve 3 is deformed to expand at the time before the hose H is inserted and at the time of insertion, and at least the inner diameter of the inlet portion 3a is set to the bulging portion. It is set to be larger than the outer diameter of the hose H inserted along the reduced diameter surface 1a2 of 1a, and as shown in FIG. When pressed, the diameter is reduced and the inner diameter of the inlet portion 3a is set to be smaller than the outer diameter of the hose H inserted along the reduced diameter surface 1a2 of the bulging portion 1a.

According to such a hose joint A, when the hose H is inserted, as shown in FIGS. 1A and 1B, the tip of the hose H does not hit the inlet 3a of the expansion / contraction sleeve 3 and the expansion / contraction sleeve 3 contracts. It can be smoothly inserted between the radial surface 1a2 and a fixed position.
Thereafter, when the clamp 2 is pressed by the pressing surface portion 2b along with the axial movement, as shown in FIG. 1D, the expansion / contraction sleeve 3 is deformed and the diameter of the inlet portion 3a and the nipple 1 is reduced. The hose H is sandwiched in the radial direction between the surface 1a2.

  At this time, when the pressing cylinder part 4 is provided separately or integrally on the inner peripheral surface of the fastening tool 2, the diameter-enlarging surface 1 a 1 of the bulging part 1 a and the pressing cylinder part 4 are moved by the axial movement of the fastening tool 2. At the same time, the hose H is sandwiched in the radial direction, and at the same time, the outer peripheral surface H2 of the hose H is inserted into the hose insertion direction side end surface (rear side end surface) 4a of the pressing cylinder portion 4 and the anti-hose insertion of the expansion / contraction sleeve 3 The outer peripheral surface H2 of the hose H that bulges and deforms through the annular space S formed between the direction-side end surface (entrance-side end surface) 3b and toward the engagement recess 2c, and thereby bulges and deforms is the engagement recess. It adheres and press-contacts along 2c.

More specifically, the expansion / contraction sleeve 3 is formed so as to gradually increase in diameter in the anti-insertion direction, and a slit 3c extending in the axial direction is formed as a notch so as to be elastically deformable in the radial direction. The inlet 3a is formed with an annular convex portion that opposes the outer peripheral surface H2 of the hose H, and the inner diameter of this annular convex portion is reduced to the reduced diameter surface 1a2 of the bulging portion 1a before and when the hose H is inserted. When the expansion / contraction sleeve 3 is pressed by the pressing surface portion 2b as the fastening tool 2 moves in the axial direction, the inner diameter of the annular convex portion is expanded. It is set to be smaller than the outer diameter of the hose H inserted along the reduced diameter surface 1a2 of the portion 1a.
That is, the inner diameter of the expansion / contraction sleeve 3 on the back side in the hose insertion direction is set to be substantially the same as the outer diameter of the hose H inserted along the reduced diameter surface 1b2 of the bulging portion 1b, and the axial movement of the fastening tool 2 is performed. Accordingly, when the expansion / contraction sleeve 3 is pressed by the pressing surface portion 2b, the annular convex portion serving as the inlet portion 3a bites into the outer peripheral surface H2 of the hose H, and the other inner peripheral surface 3d presses against the outer peripheral surface H2 of the hose H. I am doing so.

According to such a hose joint A, when the hose H is inserted, as shown in FIGS. 1 (a) and 1 (b), the tip of the hose H is opposed to the annular convex portion serving as the inlet portion 3a of the expansion / contraction sleeve 3. Is smoothly inserted between the inner peripheral surface 3d of the expansion / contraction sleeve 3 and the reduced diameter surface 1a2 and the rear outer peripheral surface 1c of the nipple 1.
Thereafter, when the clamp 2 is pressed by the pressing surface portion 2b along with the axial movement, the expansion / contraction sleeve 3 is reduced in diameter as shown in FIG. At the same time as the hose H is sandwiched between the surface 1c, the annular convex portion serving as the inlet portion 3a bites into the outer peripheral surface H2 of the hose H and is further sandwiched between the reduced-diameter surface 1a2 of the nipple 1.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 (a) to (d), FIGS. 2 (a) to (d), FIGS. 3 and 4 (a) and (b), the first embodiment is used as a sliding means 1f of the nipple 1. The screw part is engraved, the inner screw part is engraved as the sliding means 2a of the fastening tool 2 opposite to the screw part, the outer screw part 1f and the inner screw part 2a are screwed together, and the fastening tool 2 is attached to the nipple 1. By rotating and moving in the hose insertion direction, the pressing surface portion 2b integrally formed on the inner peripheral surface of the fastening tool 2 presses the inlet portion 3a of the expansion / contraction sleeve 3 to reduce the diameter thereof.

As shown in FIGS. 4 (a) and 4 (b), the expansion / contraction sleeve 3 is a cylinder having an annular convex portion serving as an inlet portion 3a, an anti-hose insertion direction side end surface (inlet side end surface) 3b, and an inner peripheral surface 3d. A cylindrical expansion / contraction portion 3e and an annular flange portion 3f integrally formed from the other end of the cylindrical expansion / contraction portion 3e in the hose insertion direction toward the outer peripheral surface 1c of the nipple 1, While using as a contact surface of the front end surface (cut surface) H3 of the hose H, a plurality of slits 3c are formed in the circumferential direction.
Of these slits 3c, one slit 3c1 is continued over the cylindrical expansion / contraction portion 3e and the annular flange 3f, but the other slit 3c2 is partially attached to the cylindrical expansion / contraction portion 3e or the annular flange 3f. Is formed.

Furthermore, a stopper 3g that is opposed to the distal end edge 1h of the external thread portion that serves as the slide means 1f of the nipple 1 is integrally formed on the outer peripheral surface of the cylindrical expansion / contraction portion 3e of the expansion / contraction sleeve 3.
Here, the axial dimension from the stopper 3g to the annular flange 3f and the axial dimension from the tip edge 1h of the external thread 1f of the nipple 1 to the annular step 1e should be set in advance. For example, by bringing the stopper 3g into contact with the tip edge 1h of the external thread portion 1f, the annular flange portion 3f of the expansion / contraction sleeve 3 is positioned so as to contact the annular step portion 1e of the nipple 1, and the expansion / contraction sleeve 3 is set so that the annular flange 3f comes into contact with the annular step 1e of the nipple 1 only by looking at the positional relationship between the stopper 3g and the leading edge 1h of the outer threaded portion 1f, for example, the looseness of both. It becomes possible to determine whether or not it is assembled correctly.
Further, by inserting the front end surface H3 of the hose H against the annular flange 3f of the expansion / contraction sleeve 3, the hose H is brought to the target position by the backlash between the stopper 3g and the front end edge 1h of the external thread 1f. It can be easily sensed that it has been securely inserted, and the expansion / contraction sleeve 3 can be prevented from being deformed and broken as the hose H is inserted.

In the first embodiment, since the fastening tool 2 rotates relative to the nipple 1, a ring separate from the fastening tool 2 is used as the pressing cylinder portion 4 described above.
In the case of the example shown in FIG. 4 (a), the separate ring that becomes the pressing cylinder portion 4 is formed with a slit 4b extending in the entire axial direction so as to be elastically deformable in the radial direction. Tapered surfaces 4d and 2e are formed on the outer peripheral surface 4c and / or one of the inner peripheral surfaces of the fastening tool 2 opposite to the outer peripheral surface 4c to press the separate ring 4 so that the diameter of the ring 4 is reduced. The inner diameter in the state is set to be smaller than the outer diameter of the hose H inserted along the expanded surface 1a1 of the bulging portion 1a.
Further, as another example, the pressing cylinder portion 4 can be formed into a ring shape without slits, and the hose H can be pressed against the diameter-enlarged surface 1a1 of the bulging portion 1a without being reduced in diameter. It is.

Further, a connecting portion 1i for connecting to a pipe connection port (not shown) of another device is connected to the back side in the hose insertion direction from the outer screw portion formed as the sliding means 1f of the nipple 1. . In the case where an internal thread is engraved on the inner peripheral surface of the pipe connection port in another device connected to the hose joint A, the connection portion 1i is engraved with an external screw corresponding thereto, When an external screw is engraved on the outer peripheral surface of the pipe connection port, an internal screw corresponding to this is engraved.
In the illustrated example, the nipple 1 is a cut product obtained by cutting a cylindrical material by, for example, cutting, and an external screw is engraved as the connecting portion 1i.

On the other hand, the hose H is preferably made of a soft material such as a soft synthetic resin such as silicone rubber or vinyl chloride, and the inner peripheral surface H1 and the outer peripheral surface H2 are flat.
Specific examples thereof include a laminated hose in which a plurality or a single synthetic resin blade (reinforcing yarn) is spirally embedded as an intermediate layer between the transparent or opaque outer layer and inner layer, and an intermediate layer As a spiral reinforcement hose in which a strip-shaped reinforcing material made of synthetic resin or metal, such as a rectangular cross section, and a linear reinforcing material, such as a circular cross section, are spirally wound and integrated, for example, fiber reinforcement such as glass fiber or flame-retardant fiber A braided reinforcement hose in which a material is braided on the outer peripheral surface of the hose, a spiral reinforcement hose in which a metal wire or a hard synthetic resin wire is embedded spirally, a soft synthetic resin hose having a single layer structure, or the like is used.

Next, the connection method of the hose H by such a hose coupling A will be described according to the order of steps, and the effects obtained thereby will also be described.
From the disassembled state of the hose joint A shown in FIGS. 3 and 4 (a) and 4 (b), as shown in FIGS. 1 (a) and 2 (a), first, the annular step portion 1e and the rear outer periphery of the nipple 1 are used. When the expansion / contraction sleeve 3 is set on the surface 1c while getting over the bulging portion 1a of the nipple 1, an insertion space for the hose H is formed between the outer peripheral surface 1c and the inner peripheral surface 3b of the expansion / contraction sleeve 3. Is done.
Further, the hose H is inserted into a separate ring that serves as the fastening tool 2 and the pressing cylinder portion 4, and then the tip of the hose H is inserted into the insertion space of the hose H along the bulging portion 1 a of the nipple 1. Start.

  At this time, the ring-shaped convex portion that becomes the inlet portion 3a of the expansion / contraction sleeve 3 is expanded and deformed so as to be larger than the outer diameter of the hose H inserted along the reduced diameter surface 1a2 of the bulging portion 1a. Therefore, without inserting the tip of the hose H against the annular convex portion, it is smoothly inserted between the inner peripheral surface 3d of the expansion / contraction sleeve 3 and the reduced diameter surface 1a2 and the rear outer peripheral surface 1c of the nipple 1, As shown in FIGS. 1 (b) and 2 (b), the tip surface H3 of the hose H abuts against the annular step 1e of the nipple 1 via the annular flange 3f of the expansion / contraction sleeve 3, and further hose H Cannot be inserted.

Next, the fastening tool 2 is moved in the hose insertion direction, and the inner screw portion 2a is screwed into the outer screw portion 1f of the nipple 1 as shown in FIGS. 1 (c) and 2 (c). Even if the tool 2 is rotated, it slips with a separate ring to be the pressing cylinder portion 4 and the rotational force is not transmitted to the hose H through the ring, so that the hose H is prevented from being twisted.
Along with this, the inner peripheral surface 4e of the ring makes strong contact with the outer peripheral surface H2 of the hose H inserted along the enlarged diameter surface 1a1 of the bulging portion 1a. Deviation occurs between the outer peripheral surface 4c and the ring is deformed by the taper surfaces 4d and 2e.
As a result, a force is generated so that the inner peripheral surface 4e of the ring is further pressed against the outer peripheral surface H2 of the hose H by the movement of the tightening tool 2 and pulled in the hose insertion direction, and the expansion / contraction sleeve 3 is counteracted. The distance from the hose insertion direction side end surface (inlet side end surface) 3b gradually narrows.

Furthermore, since the pressing surface portion 2b abuts on the cylindrical expansion / contraction portion 3e of the expansion / contraction sleeve 3 and pressurizes in the radial direction by the movement of the fastening tool 2 in the hose insertion direction, as shown in FIGS. 1 (d) and 2 (d). As described above, the cylindrical expansion / contraction portion 3e of the expansion / contraction sleeve 3 undergoes a diameter reduction deformation, and the hose H is sandwiched between the annular convex portion serving as the inlet portion 3a and the diameter reduction surface 1a2 of the bulging portion 1a, The annular protrusion 3a bites into the outer peripheral surface H2 of the hose H, and the other inner peripheral surface 3d presses against the outer peripheral surface H2 of the hose H.
At the same time, the inner peripheral surface 4e of a separate ring to be the pressing cylinder portion 4 bites into the outer peripheral surface H2 of the hose H, and between the enlarged diameter surface 1a1 of the bulging portion 1a and the pressing cylinder portion 4. The hose H is sandwiched in the radial direction.

Thereby, the outer peripheral surface H2 of the hose H is a hose insertion direction side end surface (rear side end surface) 4a of a separate ring to be the pressing cylinder portion 4, and the anti-hose insertion direction side end surface (inlet side end surface) of the expansion / contraction sleeve 3. The outer peripheral surface H2 of the hose H that has bulged and deformed is brought into close contact with and pressed against the engaging recess 2c through the annular space S formed between them and 3b.
In particular, when the hose H is soft and easily deformed, for example, like a silicone hose, the inner peripheral surface 4e of the separate ring that becomes such an annular convex portion 3a or the pressing cylinder portion 4 is bitten and the inside of the expansion / contraction sleeve 3 The outer circumferential surface H2 of the hose H bulges by the compression of the circumferential surface 3d, and the hose insertion direction side end surface (rear side end surface) 4a of the ring and the anti-hose insertion direction side end surface (inlet side) of the expansion / contraction sleeve 3 Since the hose H is securely clamped in the axial direction and the radial direction and the pushing position of the hose tip is stabilized, the sealing performance and the disconnection strength between the outer peripheral surface of the nipple 1 and the hose H are secured. Can be increased.

  In the embodiment shown above, the outer screw portion and the inner screw portion that are screwed to each other are formed as the slide means 1f and 2a that move the fastening tool 2 in the axial direction with respect to the nipple 1. However, the present invention is not limited to this. A structure other than a screw may be used as long as the fastening tool 2 can be moved in the axial direction with respect to the sleeve 3.

DESCRIPTION OF SYMBOLS 1 Nipple 1a Expansion part 1a1 Expanded surface 1a2 Reduced diameter surface 1c Back side outer peripheral surface 2 Fastening tool 2b Pressing surface part 2c Engagement recessed part 3 Expanding / contracting sleeve 3a Inlet part 3b Anti-hose insertion direction side end face (inlet side end face)
3c slot 3d inner peripheral surface 3f annular flange 4 pressing cylinder 4a hose insertion direction side end face (back side end face)
H hose H1 inner peripheral surface H2 outer peripheral surface H3 tip surface

Claims (3)

A hose joint in which a hose is inserted along the outer peripheral surface of the nipple, and the inner peripheral surface of the hose is in close contact with the outer peripheral surface of the nipple by the axial movement of a fastening tool provided outside the nipple,
It said nipple bulged portion of the annular having a reduced diameter surface gradually reduced in diameter from the diameter expansion surface and a maximum diameter portion gradually enlarged to hose insertion direction is formed on the outer peripheral surface,
An expansion / contraction sleeve that is elastically deformable in the radial direction and is provided opposite to the diameter-reduced surface of the bulging portion and the outer peripheral surface located on the rear side in the hose insertion direction than the diameter-reduced surface;
Provided face the outer peripheral surface of the front Symbol scaling sleeve, and said clamp pressing face is formed on the inside for pressing in so that reducing the diameter of the scaling sleeve with the axial movement against the nipple Prepared,
The nipple includes a rear outer peripheral surface formed on the back side in the hose insertion direction with respect to the diameter-reduced surface of the bulging portion, and an annular stepped portion formed to protrude from the back outer peripheral surface on the rear side in the hose insertion direction. A cylindrical portion formed on the outer side of the annular step portion so as to face the outer peripheral surface,
The expansion / contraction sleeve includes an inlet portion formed so as to face the reduced diameter surface, and a cylindrical expansion / contraction portion formed so as to face the outer peripheral surface on the back side in the hose insertion direction from the inlet portion. An annular flange portion formed so as to face the front end surface of the hose along the annular stepped portion from the rear end in the hose insertion direction of the cylindrical expansion / contraction portion toward the outer peripheral surface, and the cylindrical expansion / contraction A stopper that protrudes and abuts against the distal end edge of the cylindrical portion on the outer peripheral surface of the cylindrical portion,
The inner diameter of the inlet part and the cylindrical expansion / contraction part is set to be larger than the outer diameter of the hose inserted along the reduced diameter surface of the bulging part when the hose is inserted, and the tightening When the expansion / contraction sleeve is pressed by the pressing surface portion along with the axial movement of the tool, it is set to be smaller than the outer diameter of the hose inserted along the reduced diameter surface of the bulging portion ,
The axial dimension from the hose insertion direction back side protrusion surface of the stopper to the hose insertion direction back end of the annular flange matches the axial dimension from the tip edge of the cylindrical part to the annular step part. A hose coupling characterized by being set as follows. Said inlet portion and said tubular scaling unit of the scaling sleeve, while the elastically deformable the inlet portion and the tubular scaling portion slit extending axially notch formed to the radial direction, the scaling sleeve to the inlet portion to form the annular convex portion facing the outer peripheral surface of the hose, the inner diameter of the annular convex portion, during insertion of the hose is inserted along the reduced diameter surface of the bulging portion When the expansion / contraction sleeve is pressed by the pressing surface portion with the axial movement of the fastening tool, the inner diameter of the annular convex portion is set to be larger than the outer diameter of the hose. the hose coupling of claim 1, wherein the set to be smaller than the outer diameter of the hose to be inserted along the reduced diameter surface parts. The inner peripheral surface of said fastener, provided separately or integrally pressing tube portion formed so as to face the diverging surface of the bulging portion with the axial movement of the clamp, the clamp An engagement recess is formed so as to face the annular space formed between the end surface on the hose insertion direction side of the pressing tube portion and the end surface on the anti-hose insertion direction side of the expansion / contraction sleeve in a tightened state by axial movement of The hose coupling according to claim 1 or 2, wherein

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