WO2011027766A1

WO2011027766A1 - Hose joint

Info

Publication number: WO2011027766A1
Application number: PCT/JP2010/064887
Authority: WO
Inventors: 伸二滝本
Original assignee: 株式会社トヨックス
Priority date: 2009-09-02
Filing date: 2010-09-01
Publication date: 2011-03-10
Also published as: CN102575801B; JP4868371B2; MY162527A; CN102575801A; JP2011052772A

Abstract

Provided is a hose joint by which an insertion position of a front end of a hose is stabilized to thereby enhance the sealing efficiency and a disconnecting strength between the outer surface of a nipple and the hose. When the hose (H) is inserted, the inner diameter of an inlet portion (3a) of an expandable and contractible sleeve (3) opposed to a decreasing diameter portion (1a2) is set to be larger than the outer diameter of the hose (H) which is inserted along the decreasing diameter portion (1a2) of a bulged portion (1a), whereby the front end of the hose (H) is smoothly introduced between the expandable and contractible sleeve (3) and the decreasing diameter portion (1a2) without causing the front end of the hose to butt against the inlet portion (3a) of the expandable and contractible sleeve (3) and can be inserted to a predetermined position. Thereafter, when pressed by a pressing surface portion (2b) in accordance with the axial movement of a fastening tool (2), the inner diameter of the inlet portion (3a) of the expandable and contractible sleeve (3) is set to be smaller than the outer diameter of the hose (H) inserted along the decreasing diameter portion (1a2) of the bulged portion (1a), whereby the hose (H) is held between the inlet portion (3a) of the expandable and contractible sleeve (3) and the decreasing diameter portion (1a2) of the nipple (1).

Description

Hose fitting

The present invention relates to a hose coupling used for piping connection of a soft and 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 a nipple and the inner peripheral surface of the hose is in close contact with the outer peripheral surface of the nipple by axial movement of a fastener provided on the outer side.

Conventionally, in a hose joint of this type, a front connected between a nut connected to a second joint configured as a nipple and an inner peripheral surface of a female screw of the nut and an outer peripheral surface of a hose tip The inner side of the hose end in a state of being connected to the ring, the back ring interposed between the rear end inner peripheral surface of the nut and the outer peripheral surface of the hose spaced apart from the front ring by a predetermined distance, and the second joint There is an insert sleeve which is fitted into a circumferential surface and which holds an inner and outer peripheral surface on the end of the hose together with a front ring or a buckling (see, for example, Patent Document 1).
At the time of connection, first, with the nut engaged with the back ring, insert this back ring together with the nut on the outer periphery of the hose and 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 buckling is drawn to the front ring side, and the outer periphery of the hose externally fitted on the annular convex portion of the insert sleeve or the both curved slopes is the front ring In addition, at the same time as being firmly clamped in the radial direction by the buckling, a portion which is radially expanded and deformed by the annular convex portion is clamped in the axial direction by the front ring or the buckling.

Registered Utility Model No. 3088531

However, in such a conventional hose joint, the end of the hose is fitted into the insert sleeve before the front ring is fitted, and then the nut is screwed if the insert sleeve is not fitted to the second joint As a result, it takes time and effort to connect and is not easy to operate, and there is a problem that connection can not be performed in a short time.
Also, due to the fitting of the insert sleeve and the second joint, a gap is created between the communication hole formed on the inner periphery of the insert sleeve and the communication hole of the second joint, and fluid infiltrates into this gap. As a liquid pool occurs, it is easy to become unsanitary, and furthermore, the fitting cylinder outer periphery of the insert sleeve is fluid-tightly fitted to 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 is also in contact with (is in contact with) the O-ring, which tends to be unsanitary, resulting in a problem that the application is limited.
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 portion of the hose is inserted into the front ring which stands by at the fixed position. It is conceivable to shorten the process up to the screwing of the fluid or to select the type and use of the fluid without being influenced by the liquid accumulation in the communication passage and the 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 diameter 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 may be screwed in a state in which the nut is not firmly pushed into the fixed position. As described above, if the nut is screwed while the end of the hose is not fitted into the front ring, a reliable connection can not be made, and as a result, the sealability and removal strength between the outer peripheral surface of the insert sleeve and the hose are reduced. is there.

An object of the present invention is to address such problems, and to stabilize the pressing position of the tip of the hose to enhance the sealing performance and the detachment strength between the outer peripheral surface of the nipple and the hose, and the outer periphery of the nipple. The object of the invention is to further improve the sealing property and removal strength between the surface and the hose, to reliably clamp the hose in the axial direction and the radial direction, and to reliably insert the hose to a fixed position.

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 the outer periphery of the nipple by the axial movement of the clamp provided on the outer side. An annular bulging portion formed on the outer peripheral surface of the nipple so as to gradually expand in diameter in the hose insertion direction and gradually reduce in diameter from the maximum diameter portion thereof; A radially expandable resiliently contracting sleeve which is provided opposite to the diameter reducing surface of the bulged portion, and which is formed on the inner side of the fastener against the outer peripheral surface of the expandable sleeve, and which is used for the nipple And a pressing surface portion for pressing the expansion sleeve so as to reduce its diameter along with the axial movement of the expansion sleeve, the expansion sleeve having an inner diameter of a portion opposite to the hose insertion direction opposite to the diameter reduction surface, Insertion To be larger than the outer diameter of the hose inserted along the diameter reducing surface of the bulging portion, and when pressed by the pressing surface as the clamp is moved in the axial direction, It sets so that it may become smaller than the outer diameter of the said hose inserted along the diameter-reduced surface of the said bulging part.

In addition to the features described above, the expansion sleeve is formed so as to gradually increase in diameter in the direction opposite to the hose insertion direction, and the axially extending slot is cut out to be elastically deformable in the radial direction At the inlet of the expansion sleeve, an annular convex portion is formed opposite to the outer peripheral surface of the hose, and the inner diameter of the annular convex portion is reduced on the diameter reducing surface of the bulging portion when the hose is inserted. It is set to be larger than the outer diameter of the hose inserted along, and when the expansion / contraction sleeve is pressed by the pressing surface as the clamp is moved in the axial direction, the diameter reducing surface of the bulging portion It is set to be smaller than the outer diameter of the hose inserted along the.

Furthermore, in addition to the features described above, the inner peripheral surface of the clamp is a separate body or a pressing cylinder formed to face the enlarged diameter surface of the bulging part as the clamp moves in the axial direction. Integrally provided, facing an annular space formed between a hose insertion direction side end surface of the pressing cylinder and an opposite hose insertion direction side end surface of the expansion / contraction sleeve in a tightening state by axial movement of the tightening tool Thus, the present invention is characterized in that the engaging recess is formed.

Further, in addition to the above-mentioned features, an annular flange portion facing the tip end surface of the hose is formed at the end portion in the hose insertion direction of the expansion and contraction sleeve so as to face the back side outer peripheral surface of the nipple. .

The present invention having the features described above sets the inner diameter of the inlet facing the diameter reducing surface of the expansion sleeve larger than the outer diameter of the hose inserted along the diameter reducing surface of the bulging portion when the hose is inserted. By doing this, the tip end of the hose can be smoothly inserted between the expansion and contraction sleeve and the reduced diameter surface without inserting into the inlet of the expansion and contraction sleeve and can be inserted to a fixed position. After that, when the clamp is pressed by the pressing surface along with the axial movement of the clamp, the inner diameter of the inlet of the expansion sleeve is set smaller than the outer diameter of the hose inserted along the reduced diameter surface of the bulge. As a result, the hose is sandwiched between the inlet of the expansion sleeve and the reduced diameter surface of the nipple, so the push-in position of the hose tip is stabilized to improve the sealing performance and removal 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 the hose connection operation can be performed easily and in a short time and reliably for anyone.
In addition, compared with the conventional one having a gap in the middle of the communication passage, no liquid pool or liquid contact with the O-ring occurs in the middle of the communication passage formed along the inner circumferential surface of the nipple. Yes, regardless of the type and application of the fluid, the degree of freedom is increased and usability is good.

Furthermore, the expansion sleeve is formed so as to gradually increase in diameter in the direction opposite to the hose insertion direction, and a slot extending in the axial direction is cut out to be elastically deformable in the radial direction, and the expansion and contraction An annular convex portion is formed at the inlet portion of the sleeve to face the outer peripheral surface of the hose, and the inner diameter of the annular convex portion is inserted along the diameter reducing surface of the bulging portion when the hose is inserted. The expansion sleeve is set to be larger than the outer diameter of the hose, and when the expansion sleeve is pressed by the pressing surface along with the axial movement of the fastener, the expansion sleeve is inserted along the reduced diameter surface of the bulging portion. If the diameter of the hose is set smaller than the outer diameter of the hose, the tip of the hose does not abut the annular convex portion which is the inlet of the expansion sleeve during insertion of the hose, and the inner periphery of the expansion sleeve Face and shrinkage When the sleeve is smoothly inserted between the surface and the back side outer peripheral surface and then pressed by the pressing surface along with the axial movement of the fastener, the expansion and contraction sleeve is reduced in diameter and the inner peripheral surface and the back side outer periphery of the nipple At the same time as the hose is inserted in the radial direction between the surface and the ring, the annular convex part bites into the outer peripheral surface of the hose and is further inserted between the diameter reducing surface of the nipple and the outer surface of the nipple. Sealability and pull-out strength can be further improved.

Further, a pressing cylindrical portion formed separately from or integrally with the inner peripheral surface of the clamp so as to face the enlarged diameter surface of the bulging portion along with the axial movement of the clamp is provided, The engagement concave portion is opposed to the annular space formed between the hose insertion direction side end surface of the pressing cylinder and the non-hose insertion direction side end surface of the expansion sleeve in a tightened state by axial movement of the tool. When formed, the hose is radially interposed between the enlarged diameter surface of the bulging portion and the pressing cylinder by axial movement of the fastener, and at the same time the outer peripheral surface of the hose is the pressing cylinder. The outer peripheral surface of the hose that has been bulgingly deformed toward the engagement recess through the annular space formed between the end face of the hose in the direction of insertion of the hose and the end face of the expansion sleeve in the direction of inserting the hose. Is in close contact and press-contact along the engagement recess. It is possible to reliably sandwich the scan in the axial and radial directions.
As a result, even if the hose is particularly soft and easily deformed like, for example, a silicone hose, the deformation of the hose is used to improve the sealing performance and the removal strength, so that the hose can be reliably prevented from dropping off.

In the case where an annular flange facing the tip end surface of the hose is formed at the end of the expansion sleeve in the hose insertion direction toward the back outer peripheral surface of the nipple, the back outer peripheral surface of the nipple is formed. By setting the expansion sleeve, the insertion space of the hose is formed between the outer peripheral surface on the back side and the inner peripheral surface of the expansion sleeve, and with the insertion of the hose, the tip end surface is the annular ridge of the expansion sleeve Since the hose H can not be inserted further, the hose can be reliably inserted into the fixed position.
As a result, reliable connection can be made.

The longitudinal cross-sectional 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 a 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 movement of a clamp, (d) shows the clamp It shows the state after the end of the movement of the tool. It is a vertical front view which shows the disassembled 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 at only the expansion-contraction sleeve from the reverse direction.

In the embodiment of the hose joint A of the present invention, as shown in FIGS. 1 to 4, the nipple 1 into which the connecting end of the flexible hose H is inserted, and the axial reciprocation with respect to this 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, The inner peripheral surface H1 of the connection end of the hose H is the nipple 1 by moving the clamp 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 sleeve 3. The hose H is closely connected to the outer peripheral surface so as not to be pulled out.

The nipple 1 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, for example, with a hard material such as a metal such as brass or hard synthetic resin Can be formed into a cylindrical shape with a thin wall thickness by pressing or other forming a plate material made of a rigid material, and the diameter is gradually enlarged in the hose insertion direction on the outer peripheral surface of the plate from the largest diameter portion An annular bulging portion 1a is formed to be gradually reduced in diameter.

The annular bulging portion 1a has an enlarged diameter surface 1a1 which gradually expands in diameter in the hose insertion direction from the tip edge 1b in a direction opposite to the hose insertion direction of the nipple 1 (hereinafter referred to as reverse insertion direction) The diameter reducing surface 1a2 gradually decreasing in diameter from the diameter portion in the hose insertion direction is continuously disposed, and in the example shown in FIGS. As an example, it is also possible to incline in a curved surface.
A back side 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 rear side of the reduced diameter surface 1a2 of the bulging portion 1a in the hose insertion direction.

On the inner peripheral surface of the tip of the nipple 1 is formed a reverse tapered surface 1d gradually expanding in diameter toward the tip, and in the example shown in FIG. 1 (d), the nipple 1 is tightened by the fastener 2 described later. The hose H is pushed inward by the pressing cylinder 4 by projecting the pressing cylinder 4 which will be described later than the tip edge 1 b of the second embodiment so that the inner end portion thereof is continuous with the reverse tapered surface 1 d of the nipple 1. It is preferable to arrange.

Further, on the back side of the nipple 1 in the hose insertion direction with respect to the back side outer peripheral surface 1c, an annular step 1e that protrudes substantially perpendicularly from the back side outer peripheral surface 1c is integrally formed. A slide means 1f is formed to support the clamp 2 to be described later reciprocably in the hose insertion direction and in the direction opposite to the hose insertion direction.
Furthermore, as the non-slip means 1g for rotational operation, flat portions on which tools etc. engage are made circumferentially on the outer peripheral surface of the nipple 1 at appropriate intervals as in the example shown in FIGS. It is preferable to form a plurality of projections, or to form an uneven portion such as a knurled.

The fastener 2 is formed of a material similar to or different from the nipple 1 and formed in a substantially cylindrical shape having an inner diameter larger than the outer diameter of the hose H, and engaged with the slide means 1f of the nipple 1 on the inner peripheral surface thereof. A slide means 2a is formed to support reciprocably in the hose insertion direction and the counter insertion direction.
As the slide means 1 f of the nipple 1 and the slide means 2 a of the clamp 2, a screw is used to relatively reciprocate in the hose insertion direction and the counter insertion direction by rotating the clamp 2 relative to the nipple 1. It is preferable to form.
In addition, as another example, it is also possible to make concavo-convex fit so that both can be locked so as not to move by bringing the nipple 1 and the clamp 2 into surface contact and moving in the hose insertion direction.

Further, on the inner side of the clamp 2, there is provided a means for radially compressing the diameter of the cylindrical expansion / contraction portion 3e of the expansion / contraction sleeve 3 described later with the axial movement of the clamp 2 with respect to the nipple 1 to reduce the diameter.
As the sleeve diameter reducing means, it is preferable to directly form on the inner peripheral surface of the fastener 2 a pressing surface portion 2b which is inclined in a tapered shape in which the inner diameter gradually decreases in the counter-insertion direction.
As another example, a pressing sleeve is rotatably provided on the inner side (inner periphery) of the fastener 2 and the inner circumferential surface of the pressing sleeve is opposed to the outer circumferential surface of the cylindrical expansion / contraction portion 3e of the expansion sleeve 3 described later. It is also possible to use a tapered pressing surface portion whose inner diameter gradually decreases in diameter toward the opposite insertion direction.

On the other side of the inner peripheral surface of the clamp 2 in the opposite direction to the insertion direction, another pressing cylinder 4 is formed to face the enlarged diameter surface 1a1 of the bulging portion 1a as the clamp 2 moves in the axial direction. The hose insertion direction side end surface of the pressing cylinder portion 4, that is, the back side end surface 4a, and the opposite hose insertion direction end surface of the expansion / contraction sleeve 3 to be described later, that is, It is preferable to form the engagement recess 2c so as to face the annular space S formed between the inlet side end face 3b.

Also, as the non-slip means 2d for rotational operation on the outer peripheral surface of the clamp 2, for example, as in the examples shown in FIGS. It is preferable to form a plurality of projections, or to form an uneven portion such as a knurled.

The expansion / contraction sleeve 3 is formed in a substantially cylindrical shape, for example, of an elastically deformable material such as polyacetal resin or a synthetic resin excellent in slipperiness and heat resistance of the other surface, and inserted into the annular step 1e of the nipple 1 Thus, it is disposed to face the reduced diameter surface 1a2 of the nipple 1 and the back side outer peripheral surface 1c, and in particular, a portion on the opposite side of the hose insertion direction opposite to the reduced diameter surface 1a2 is used as the inlet 3a.
Furthermore, as shown in FIGS. 1 (a) to 1 (c), the expansion / contraction sleeve 3 undergoes a diameter expansion deformation at the time and before the insertion of the hose H, and at least the inner diameter of the inlet 3a 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. 1 (d), the pressing surface 2b is moved along with the axial movement of the fastener 2. When pressed, the diameter is reduced and the inner diameter of the inlet 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. 1 (a) and 1 (b), the distal end portion of the hose H does not abut against the inlet 3a of the expansion sleeve 3 It smoothly enters between the radial surface 1a2 and can be inserted to a fixed position.
Thereafter, when the clamp 2 is pressed by the pressing surface portion 2b with the axial movement of the fastener 2, as shown in FIG. 1D, the diameter of the expansion and contraction sleeve 3 is deformed to reduce the diameter of the inlet 3a and the nipple 1 The hose H is interposed in the radial direction between the surface 1a2.

At this time, when the pressing cylinder 4 is separately or integrally provided on the inner peripheral surface of the fastener 2, the diameter-increased surface 1a1 of the bulging part 1a and the pressing cylinder 4 by axial movement of the fastener 2. At the same time, the outer peripheral surface H2 of the hose H is inserted into the hose insertion direction side end surface (back end surface) 4a of the pressing cylinder 4 and the non-hose insertion of the expansion sleeve 3 The outer peripheral surface H2 of the hose H which is bulgingly deformed toward the engagement recess 2c through the annular space S formed between the end surface (inlet side end surface) 3b and the engagement side Close contact and press along 2c.

More specifically, the expansion / contraction sleeve 3 is formed so as to gradually expand in diameter in the counter-insertion direction, and the axially extending slit 3c is cut out to be elastically deformable in the radial direction, and An annular convex portion is formed in the inlet portion 3a opposite to the outer peripheral surface H2 of the hose H, and the inner diameter of the annular convex portion is formed on the diameter-reduced surface 1a2 of the bulging portion 1a before and during insertion of the hose H. When the expansion / contraction sleeve 3 is pressed by the pressing surface portion 2b with the axial movement of the fastener 2 by expanding the inside diameter of the annular convex portion, The diameter 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 sleeve 3 at the back in the hose insertion direction is set 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 fastener 2 is achieved. 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 is in pressure contact with the outer peripheral surface H2 of the hose H It is like that.

According to such a hose joint A, as shown in FIGS. 1 (a) and 1 (b) when the hose H is inserted, the tip of the hose H with respect to the annular convex portion to be the inlet 3a of the expansion / contraction sleeve 3 Are smoothly inserted between the inner peripheral surface 3 d of the expansion / contraction sleeve 3 and the reduced diameter surface 1 a 2 and the rear outer peripheral surface 1 c of the nipple 1.
Thereafter, when the clamp 2 is pressed by the pressing surface 2b with the axial movement of the fastener 2, as shown in FIG. 1 (d), the diameter of the expansion and contraction sleeve 3 is deformed and the inner peripheral surface 3d and the back outer periphery of the nipple 1 are reduced. Simultaneously with the insertion of the hose H with the surface 1 c, the annular convex portion serving as the inlet 3 a thereof bites into the outer peripheral surface H 2 of the hose H and is further strongly sandwiched between the reduced diameter surface 1 a 2 of the nipple 1.
Hereinafter, an embodiment of the present invention will be described based on the drawings.

As shown in FIGS. 1 (a) to 1 (d), 2 (a) to 2 (d) and FIGS. 3 and 4 (a) and 4 (b), the first embodiment can be used as the slide means 1f of the nipple 1 The screw part is engraved, the inner screw part is cut as the slide means 2a of the clamp 2 opposed to this, the outer screw part 1f and the inner screw part 2a are screwed together, and the clamp 2 is fixed 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 fastener 2 presses the inlet portion 3a of the expansion and contraction sleeve 3 so as to reduce the diameter thereof.

As shown in FIGS. 4 (a) and 4 (b), this expansion / contraction sleeve 3 is a cylinder having an annular convex portion to be the inlet portion 3a, an end face (inlet side end face) 3b opposite to the hose insertion direction and an inner circumferential surface 3d. A ring-shaped portion 3f formed integrally from the other end of the cylindrical portion 3e in the hose insertion direction toward the back side outer peripheral surface 1c of the nipple 1; While being used as an abutment surface of the tip end surface (cut surface) H3 of the hose H, a plurality of slits 3c are formed in the circumferential direction.
Among the grit 3c, one grit 3c1 is continued over the cylindrical expansion / contraction portion 3e and the annular collar portion 3f, but the other grit 3c2 is partial to the cylindrical expansion / contraction portion 3e or the annular collar portion 3f It is formed in.

Further, on the outer peripheral surface of the cylindrical expanding and contracting portion 3e of the expanding and contracting sleeve 3, a stopper 3g opposed to the tip end edge 1h of the external thread to be the sliding means 1f of the nipple 1 is integrally protruded.
Here, the axial dimension from the stopper 3g to the annular flange 3f and the axial dimension from the tip end edge 1h of the external thread portion 1f of the nipple 1 to the annular step 1e are set in advance. For example, by bringing the stopper 3g into contact with the tip end edge 1h of the external thread portion 1f, the annular collar portion 3f of the expansion / contraction sleeve 3 is positioned to abut against the annular step 1e of the nipple 1 At the time of setting 3, the annular collar 3f is brought into contact with the annular step 1e of the nipple 1 only by looking at the positional relationship between the stopper 3g and the tip edge 1h of the external thread 1f, for example, the looseness between them. It can be determined whether or not it is correctly assembled.
Also, by inserting the tip end face H3 of the hose H while abutting against the annular collar 3f of the expansion / contraction sleeve 3, the hose H reaches the target position with the backlash between the stopper 3g and the tip edge 1h of the external thread 1f. It can be easily detected that the insertion has been made reliably, and the expansion and contraction sleeve 3 can be prevented from being deformed and broken with the insertion of the hose H.

And in this Example 1, since the clamp 2 rotates relatively with respect to the nipple 1, the ring separate from the clamp 2 is used as the press cylinder part 4 mentioned above.
In the case of the example shown in FIG. 4 (a), the separate ring to be the pressing cylinder portion 4 is formed by cutting the slit 4b extending along its entire axial length so as to be elastically deformable in the radial direction. The tapered surfaces 4d and 2e are formed on the outer peripheral surface 4c and / or the inner peripheral surface of the clamp 2 opposed thereto so as to press the separate ring 4 so as to reduce its diameter. The inner diameter in the state is set to be smaller than the outer diameter of the hose H inserted along the enlarged diameter surface 1a1 of the bulging portion 1a.
Further, as another example, it is possible to form the pressing cylinder portion 4 into a ring shape without slitting and to press the hose H against the enlarged diameter surface 1a1 of the bulging portion 1a without reducing the diameter and deforming It is.

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

On the other hand, the hose H is made of a soft material such as silicone rubber and a soft synthetic resin such as vinyl chloride, and it is preferable that the inner peripheral surface H1 and the outer peripheral surface H2 be flat.
A specific example thereof is 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 the inner layer, or an intermediate layer A spiral reinforced hose integrated by spirally winding a band-shaped reinforcing material such as a rectangular or rectangular cross-section made of synthetic resin or metal and a linear reinforcing material such as a circular cross-section, thread-like reinforcement such as glass fiber or flame retardant fiber A braided reinforced hose in which a material is braided on the outer peripheral surface of a hose, a spiral reinforced hose in which a metal wire or a hard synthetic resin wire is embedded in a spiral shape, a flexible synthetic resin hose having a single layer structure, or the like is used.

Next, a method of connecting the hoses H by the hose joint 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 (b), as shown in FIGS. 1 (a) and 2 (a), first, the annular step 1e and the outer periphery of the back side of the nipple 1 When the expansion / contraction sleeve 3 is set while moving over the bulging portion 1a of the nipple 1 with respect to the surface 1c, an insertion space of the hose H is formed between the back side outer peripheral surface 1c and the inner peripheral surface 3b of the expansion / contraction sleeve 3 Be done.
In addition, the hose H is inserted into a separate ring that becomes the clamp 2 and the pressing cylinder 4, and then the tip of the hose H is directed to the insertion space of the hose H and inserted along the bulging portion 1 a of the nipple 1 Start.

At this time, the annular convex portion to be 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 expanded portion 1a. Therefore, the tip end of the hose H is smoothly inserted between the inner peripheral surface 3 d of the expansion / contraction sleeve 3 and the outer peripheral surface 1 c of the nipple 1 and the reduced diameter surface 1 a 2 without abutting the tip of the hose H As shown in FIG. 1 (b) and FIG. 2 (b), the hose H has a tip end surface H3 butting against the annular step 1e of the nipple 1 via the annular flange 3f of the expansion / contraction sleeve 3, further hose H Can not be inserted.

Next, move the clamp 2 in the hose insertion direction, and screw the inner screw portion 2a to the outer screw portion 1f of the nipple 1 as shown in FIG. 1 (c) and FIG. 2 (c). Even when the tool 2 is rotated, it does not slip with the separate ring that becomes the pressing cylinder 4 and its rotational force is not transmitted to the hose H via the ring, so that the hose H is prevented from being twisted.
Along with this, the inner circumferential surface 4e of the ring is in strong contact with the outer circumferential surface H2 of the hose H inserted along the enlarged diameter surface 1a1 of the bulging portion 1a. Misalignment occurs with the outer peripheral surface 4c, and the diameter of the ring is deformed by the tapered

surfaces

4d and 2e.
As a result, the movement of the fastener 2 causes the inner circumferential surface 4e of the ring 2 to be more strongly in pressure contact with the outer circumferential surface H2 of the hose H and to draw the force in the hose insertion direction. The distance from the hose insertion direction side end face (inlet side end face) 3b is gradually narrowed.

Furthermore, as shown in FIG. 1 (d) and FIG. 2 (d), the pressing surface portion 2b abuts against the cylindrical expansion / contraction portion 3e of the expansion sleeve 3 by the movement of the fastening tool 2 in the hose insertion direction. Thus, the diameter of the cylindrical expansion and contraction part 3e of the expansion and contraction sleeve 3 is reduced and deformed, and the hose H is sandwiched between the annular convex part to be the inlet part 3a and the reduced diameter surface 1a2 of the expansion part 1a. The annular convex portion to be the inlet 3a bites into the outer peripheral surface H2 of the hose H, and the other inner peripheral surface 3d is in pressure contact with the outer peripheral surface H2 of the hose H.
Then, at the same time, the inner peripheral surface 4 e of the separate ring that becomes the pressing cylinder 4 bites into the outer peripheral surface H 2 of the hose H, and between the enlarged diameter surface 1 a 1 of the bulging part 1 a and the pressing cylinder 4 The hose H is pinched in the radial direction.

Thus, the hose insertion direction side end face (rear side end face) 4a of the separate ring which becomes the pressing cylinder 4 and the outer hose H direction end face (inlet side end face) of the expansion sleeve 3 The outer peripheral surface H2 of the hose H which is bulgingly deformed toward the engaging recess 2c through the annular space S formed between 3b and the squeezed deformed H is in close contact and pressure contact along the engaging recess 2c.
In particular, when the hose H is soft and easily deformed like, for example, a silicone hose, the bite and expansion / contraction of the inner peripheral surface 4e of the separate ring which becomes the annular convex portion and the pressing cylinder 4 which becomes the inlet 3a. By pressing the inner peripheral surface 3d of the sleeve 3, the outer peripheral surface H2 of the hose H expands by an amount corresponding to the compression, and the hose insertion direction side end face (back side end face) 4a of the ring and the non-hose insertion direction side of the expansion sleeve 3 The hose H is firmly clamped in the axial direction and the radial direction because it is strongly sandwiched between the end face (inlet side end face) 3b, and the seal between the outer peripheral face of the nipple 1 and the hose H while stabilizing the pushing position of the hose tip. Sex and pull-out strength can be increased.

In the above-described embodiment, although the outer screw portion and the inner screw portion screwed with each other are formed as the slide means 1f, 2a for moving the clamp 2 in the axial direction with respect to the nipple 1, it is not limited thereto. As long as the fastener 2 can be moved in the axial direction with respect to the sleeve 3, a structure other than a screw may be used.

DESCRIPTION OF SYMBOLS 1 Nipple 1a bulging part 1a1 diameter-increased surface 1a2 diameter-reduction surface 1c inner peripheral surface 2 clamping tool 2b pressing surface 2c engagement recessed part 3 expansion-contraction sleeve 3a inlet part 3b non-hose insertion direction side end surface (inlet side end surface)
3c slot 3d inner circumferential surface 3f annular ridge 4 pressing cylinder 4a hose insertion direction side end surface (rear end surface)
H hose H1 inner circumferential surface H2 outer circumferential surface H3 tip surface

Claims

A hose coupling in which a hose is inserted along an outer peripheral surface of a nipple, and an inner peripheral surface of the hose is brought into close contact with an outer peripheral surface of the nipple by axial movement of a fastener provided on the outer side thereof.
An annular bulging portion formed on the outer peripheral surface of the nipple and having an enlarged diameter surface which gradually expands in the hose insertion direction and a reduced diameter surface which is gradually reduced in diameter from the largest diameter portion thereof;
An expanding sleeve that can be elastically deformed in the radial direction, which is provided opposite to the reduced diameter surface of the bulging portion and the back side outer peripheral surface located on the rear side in the hose insertion direction with respect to the reduced diameter surface;
The clamp includes a pressing surface formed inside the clamp to face the outer peripheral surface of the expansion and contraction sleeve and pressing the expansion and contraction sleeve so as to decrease in diameter along with the axial movement of the clamp relative to the nipple.
The inner diameter of the inlet facing the diameter reducing surface of the expansion sleeve is set to be larger than the outer diameter of the hose inserted along the diameter reducing surface of the bulging portion when the hose is inserted. Also, when pressed by the pressing surface along with the axial movement of the fastener, the diameter of the hose is set to be smaller than the outer diameter of the hose inserted along the reduced diameter surface of the bulging portion. And hose fittings.
The expansion sleeve is formed so as to gradually increase in diameter in the direction opposite to the hose insertion direction, and a slot extending in the axial direction is cut out to make it elastically deformable in the radial direction, and The inlet portion is formed with an annular convex portion facing the outer peripheral surface of the hose, and the inner diameter of the annular convex portion is inserted along the diameter reducing surface of the bulging portion when the hose is inserted. When the expansion sleeve is pressed by the pressing surface as the clamp is moved in the axial direction, the inner diameter of the annular convex portion is determined by the contraction of the bulging portion. The hose coupling according to claim 1, characterized in that the diameter is smaller than the outer diameter of the hose inserted along the radial surface.
On the inner peripheral surface of the clamp, a pressing cylinder portion formed separately or integrally is formed so as to face the enlarged diameter surface of the bulging part along with the axial movement of the clamp; An engagement recess is formed to face an annular space formed between the hose insertion direction side end surface of the pressing cylinder and the non-hose insertion direction side end surface of the expansion sleeve in a tightened state by axial movement. The hose coupling according to claim 1 or 2, characterized in that:
The ring-shaped collar part which opposes the front end surface of the said hose was formed in the end part of the hose insertion direction of the said expansion / contraction sleeve toward the back side outer peripheral surface of the said nipple. Hose fittings.