WO2016170599A1

WO2016170599A1 - Flexible hose

Info

Publication number: WO2016170599A1
Application number: PCT/JP2015/062113
Authority: WO
Inventors: 浩司波谷; 昇司平尾; 史和松下
Original assignee: 東拓工業株式会社
Priority date: 2015-04-21
Filing date: 2015-04-21
Publication date: 2016-10-27

Abstract

Provided is a flexible hose 1 in which an inner core 10 is covered by a tube main body 11, and a helical uneven surface is formed on the tube main body 11 by winding an outer core 15 around the tube main body 11 so as to form a double helix structure together with the inner core 10. The inner core 10 is molded using a resin material so as to have a square cross section. The tube main body 11 is seamlessly molded using a resin material. The outer core 15 is molded using a resin material. The flexible hose is structured such that displacement between the inner core and the outer core is unlikely to occur due to the adoption of a structure in which a constrictive layer 17 is formed that inwardly presses and covers an outer circumferential surface of the outer core 15, that is fused to the outer circumferential surface of the outer core 15, and that restrains bulging of the inner core 10 in a radial direction.

Description

Flexible hose

The present invention relates to a flexible hose mainly suitable for chemical applications such as chemicals, chemicals, and solvents. More specifically, the tube main body forming the tube wall of the hose has an inner spiral core made of resin (also referred to as an inner core) and The present invention relates to a flexible hose having a structure sandwiched between outer spiral cores (also referred to as outer cores).

A flexible hose having a structure in which a spiral core is reinforced with respect to the inner and outer surfaces of a tube main body having spiral irregularities is called, for example, a dew-line hose, and is used for various applications (for example, patents). Reference 1 to 3).

In the flexible hose having such a structure, the inner and outer spiral cores are in contact with the concave surface of the tube body in a free state without being fixed (fused) to the tube body. Even if it is twisted or bent, the hose is flexible without breaking.

However, due to the fact that the tube main body and the spiral core are not fixed, if the hose is bent greatly, the spiral core moves over the adjacent convex surface and moves to the adjacent concave surface. May occur.
Therefore, in the conventional flexible hose, the inner spiral core is made of a material having elasticity (for example, a metal wire), and the inner spiral core always applies a force for urging the tube body, so that the position of the spiral core is shifted. Is not easy to occur.
That is, when the hose is manufactured, a tension is applied to the inner spiral core in advance so that the diameter of the spiral is reduced as compared with the free state. In this state, the tube body is covered with the inner spiral core, and the tube The outer spiral core is wound around the outside. Thereafter, by returning the inner spiral core to a free state, the inner spiral core expands in the radial direction, and the tube body is biased. In this case, in order to give tension to the inner spiral core, the inner spiral core having a desired (finite) length must be previously processed and pulled from both sides. For this reason, the production process is not a continuous production method in which the inner spiral core molding process, tube body molding process, and outer spiral core molding process are performed continuously, but in a batch production method in which production is performed for each finite length. I have to.

Utility Model Registration No. 2546519 Japanese Patent No. 3556278 Japanese Patent Laid-Open No. 11-257553

As described above, when a material such as a metal wire having elasticity is used for the inner spiral core, an urging force can be applied, so that the problem of positional deviation of the spiral core during bending can be solved.
However, depending on the use of the hose, it may not be possible to use a metal wire that can give sufficient elastic force, such as when a corrosive fluid that corrodes the metal is passed through the hose. Therefore, instead of a metal wire, a structure in which the entire hose is made of all resin using a resin spiral core is also used. The all-resin hose is not only corrosive but also excellent in terms of weight reduction. Furthermore, when a resin spiral core is used, a special cutting tool is not required and a simple tool (for example, a nipper) Etc.) is also excellent in that it can be easily cut.

However, even if all the constituent materials are to be continuously produced as a resin, the resin inner spiral core that is continuously extruded in a semi-molten state and wound in a spiral shape is like a metal wire due to problems such as breaking. It is difficult to obtain a sufficiently large elastic force. Therefore, it is a case where it is manufactured so as to give an elastic force in the same manufacturing process as the above-described metal wire (a batch production system in which the tube body is covered with a tension reduced on the inner spiral core first). However, a large urging force could not be applied, and the problem of positional displacement of the spiral core was likely to occur.

In addition, when manufacturing flexible hoses made of all-resin, a continuous production system is used in which the flow from the inner spiral core molding process to the tube main body molding process to the outer spiral core molding process is performed continuously. It is desirable to adopt. That is, by adopting extrusion molding, while forming the inner spiral core, the tube body is continuously molded while covering the surface of the inner spiral core, and further, the outer spiral core is continuously formed on the outer side of the tube body. Wrapping enables continuous production instead of batch production. Such continuous production also makes it possible to produce seamless tubes with no length restrictions.

However, in the continuous production method, the forming process of the inner spiral core and the molding process of the tube body are performed continuously in a flow operation, so the tube body is covered with tension applied by pulling the inner spiral core from both ends. I can't. Therefore, the force which urges | biases a tube main body to an inner side spiral core was not able to be provided. Therefore, it has been difficult to manufacture an all-resin flexible hose that is unlikely to cause a positional shift of the spiral core by a continuous production method.

Therefore, the present invention provides a flexible structure having a structure in which the problem of positional displacement of the spiral core with respect to the tube main body is less likely to occur even when the inner spiral core and the outer spiral core are all resin-made flexible hoses. The purpose is to provide a hose.

In particular, it is a hose with a structure in which the inner spiral core and the tube main body cannot be biased against the tube main body, such as a flexible hose by continuous production in which the inner spiral core and the tube main body are simultaneously formed in a flow operation. Even if it exists, it aims at providing the flexible hose of the structure which does not produce the problem of the position shift of the spiral core at the time of curvature.

The flexible hose of the present invention, which has been made to solve the above problems, covers the tube main body 11 on the inner core 10 formed in a spiral shape, and further the outer core 15 formed in a spiral shape on the tube main body 11. , 25 are wound around the inner core 10 so as to form a double spiral structure, and the tube body 11 is formed with a helical irregular surface, and the inner core 10 is made of resin. The tube body 11 is seamlessly formed of a resin material, the

outer cores

15 and 25 are formed of a resin material, and the

outer cores

15 and 25 are disposed outside the

outer cores

15 and 25. The outer peripheral surfaces of the

outer cores

15 and 25 are covered so as to be in pressure contact with each other and are fused to the outer peripheral surfaces of the

outer cores

15 and 25 to suppress the bulges of the

outer cores

15 and 25 and the inner core 10 in the radial direction.

Cores

15 and 25 Constraining layer 16 to limit the Dohaba is are to be formed.

According to the present invention, the inner core is molded using a resin material without applying an elastic force that presses the tube body in the radial direction. The inner core and the tube main body are covered in a free state without being fixed. The tube main body and the outer core are also wound so as to form a double spiral structure with the inner core from above the tube main body in a free state without being fixed.
Then, a constraining layer is provided outside the outer core so as to cover the outer core and the tube body, and the constraining layer presses the outer peripheral surface of the outer core inward. As a result, the constraining layer presses the tube body inward via the outer core, so that the inner core is pressed by the tube body even if the inner core itself does not have an elastic force to urge the tube body. Therefore, there is no inconvenience that the position of the tube body is shifted over the uneven surface.
As for the outer core, since the constraining layer is fused to the outer peripheral surface of the outer core and only one outer core cannot be displaced alone, there is no problem of displacement.

According to the present invention, since the tube main body is pressed from the outside via the outer core by the constraining layer, even if a resin inner core with insufficient elasticity is used, there is a problem of positional deviation of the spiral core. Occurrence can be suppressed. Since the constraining layer is also fused to the outer peripheral surface of the outer core made of resin, positional displacement does not occur unless the entire outer core is moved all at once, so that the problem of positional displacement can be suppressed. Also, the cross-sectional shape of the inner core is rectangular, and when the hose is bent, even if the inner core and the tube body are not biased and are in a free state, a positional shift occurs. Hateful.

In the above invention, the constraining layer may be formed of a woven yarn layer and an elastomer layer that sandwiches the woven yarn layer from the front and back sides and gives elasticity.
Here, the woven yarn layer is preferably a layer woven in a lattice shape with stretched yarn. Specifically, a material in which polyester yarn is woven is preferable as a suitable yarn material. The woven yarn layer also includes a layer woven in a cloth shape (woven yarn layer with finely woven texture). In addition, the yarn itself is difficult to stretch by making it a layer woven with stretched yarn material, but by making it a woven yarn, the layer itself is a layer that can be easily deformed by following bending and twisting. .
And by sandwiching the front and back of the woven yarn layer with an elastic elastomer layer, it can be fused to the outer core together with the woven yarn layer, not only can increase the force urged by the elastomer layer, It is possible to prevent deterioration of the yarn layer due to repeated repetition of the state in which the yarn layer directly rubs against the outer peripheral surface of the tube main body (position just above the inner core).

In the above invention, a gap for enabling bending is provided between the outer core and the inner core adjacent to each other, and the gap is in contact with the tube body in the most curved state. It may be set.
In the curved state, the inner core and the outer core are brought into contact with each other with the tube body interposed therebetween, so that the inner core and the outer core that cause the positional deviation of the spiral core can be prevented from being twisted and rotated. Misalignment can be suppressed.

In the above invention, the spiral protective layer 22 may be formed on the outermost periphery. Since the external impact can be received by the spiral protective layer, each part inside thereof can be protected from the external impact.

It is an external view of the flexible hose which shows one Embodiment of this invention. It is the perspective view which decomposed | disassembled and showed the cross section of the flexible hose of FIG. It is a schematic diagram which shows the state which curved the hose of FIG. It is the perspective view which exploded and showed the section of the flexible hose which is a modification. It is a disassembled perspective view of the joint structure in the flexible hose with a pipe end joint which is other embodiment of this invention. It is a disassembled perspective view which shows a joint structure. It is a perspective view which shows a joint structure. It is a longitudinal cross-sectional view which shows a joint structure. It is a perspective view which shows the packing for water stop. It is a perspective view which shows packing for retaining. It is a top view which shows a halved exterior body. It is a perspective view which shows the different form of the packing for water stop. It is a perspective view which shows the further different form of the packing for water stop.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing the appearance of a flexible hose according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an exploded partial cross section thereof.
The flexible hose 1 includes an inner core 10, a tube body 11, an outer core 15, and a constraining layer 16 as basic components, and further, a yarn distribution layer 20, an outer winding layer 21, and a protective layer 22 are provided on the outer side. .

The inner core 10 is formed of a hard resin material (for example, PP (polypropylene resin)), and is continuously formed by being wound around a mandrel serving as a mold and formed into a spiral shape during extrusion molding. It is. The cross section of the inner core 10 is a square, more specifically, a trapezoid in which the inner surface (lower side) side of the hose is longer than the outer surface (upper side) side in order to expand the bending angle when bending.

The tube body 11 is formed as a laminate of resin film layers 12, 13 and 14. The thickness of the laminated body is much thinner than the thickness of the inner core 10 (and the outer core 15). The material and the number of layers of the film layer are changed according to the usage application of the hose. For example, by using a three-layer structure of fluororesin, PP, and fluororesin, a hose having chemical resistance and gas barrier properties can be obtained.
For example, by adopting extrusion molding using a rotating die, the tube main body 11 is formed so that each layer is sequentially formed so as to cover the outer side of the inner core 10 that is previously molded. The laminated body formed at this time is still cylindrical and not in a spiral shape.

The outer core 15 is formed by molding a hard resin material (for example, PE (polyethylene resin)), and is spirally wound by extrusion so as to form a double spiral structure with respect to the inner core 10 covered with the laminate. It is formed by walking.
As a result, the laminated body (resin film layers 12, 13, 14) sandwiched between the inner core 10 and the outer core 15 is formed with uneven surfaces along the inner core 10 and the outer core 15. The tube main body 11 which consists of a film layer which has a shape unevenness | corrugation is formed. And the tube main body 11 on the inner core 10 and the outer core 15 on the tube main body 11 can be continuously processed by a flow operation, and can be produced as a seamless hose having a desired length.

The inner core 10, the tube main body 11, and the outer core 15 are not fixed to each other, but the cross section of the inner core 10 is rectangular, and the tube main body 11 (laminated body) is thin, and the inner core 10 and the outer core 15 The length (height) in the radial direction is the same, or the inner core 10 is slightly shorter than the outer core 15. Therefore, in order for the inner core 10 to move over the adjacent outer core 15 when it is bent, it has a structure that has to climb over the same height as the inner core 10, so it is very resistant. The shape is so large that misalignment is unlikely to occur.

Moreover, since the outer core 15 and the inner core 10 have the same height and the tube main body 11 is thin, the outer peripheral surface side of the outer core 15 comes into contact with the constraining layer 16 in a free state. The cross section of the outer core 15 is elliptical (circular) in this embodiment.
The lateral width of the outer core 15 and the lateral width of the inner core 10 are determined in relation to the pitch of the irregularities of the tube body 11 (that is, the pitch of the inner core 10). Specifically, the gap (play) necessary to be in a curved state is ensured between the inner core 10 and the tube main body 11 and between the tube main body 11 and the outer core 15 and is most flexible. In such a state, the left and right inner cores 10 (outer core 15) are sandwiched and fixed by the outer core 15 (inner core 10) between them, so that the inner core 10 (outer core 15) extends in the vertical and horizontal directions. The gap is set so as not to cause misalignment (see FIGS. 3A and 3B).

A constraining layer 16 is coated on the outer side of the outer core 15 so as to cover the outer core 15 and the tube body 11. The constraining layer 16 includes a weaving yarn layer 18 in which stretched polyester yarns are woven into a lattice shape to give stretchability, and elastomer layers 17 and 19 (for example, sandwiching the weaving yarn layer 18 from both front and back surfaces with a stretchable material). Olefin elastomer, styrene elastomer, ethylene vinyl acetate copolymer (EVA), etc.). The constraining layer 16 covers the outer peripheral surface of the outer core 15 with a tension applied so that the outer core 15 is pressed from the outside. As a result, the outer core 15 presses the tube main body 11 inward, and the tube main body 11 presses the inner core 10. Is pressed.
The portion P of the outer peripheral surface in contact with the outer core 15 is fused to the constraining layer 16 in a tensioned state. Thus, in order to increase the distance between the outer cores 15, it is necessary to expand against the tension of the constraining layer 16, so that the distance between the outer cores 15 can be increased only slightly. That is, the length of the outer core 15 that can move in the direction of the spiral axis (lateral direction) is limited to the expandable width of the constraining layer 16, and the outer core 15 overcomes the adjacent convex surface of the tube main body 11 and has one outer core. Only 15 is prevented from being displaced.

In order to improve the pressure resistance performance of the hose 1, the outer side of the constraining layer 16 is woven with a polyester thread so as to cover the entire constraining layer 16 so as to have a lattice shape in an oblique direction different from the lattice shape of the woven yarn layer 18. The yarn distribution layer 20 that suppresses the axial extension of the hose 1 and the outer winding layer 21 are formed on the outer side thereof. Further, in the curved state, the force applied to the constraining layer 16 varies between the outer region of the outer core 15 and the outer region of the inner core 10, but the force is made uniform by the presence of the yarn distribution layer 20 and the outer winding layer 21. be able to. Further, when a large internal pressure is applied, the tube main body 11 can be prevented from expanding and being damaged due to the presence of these.
Furthermore, a protective layer 22 having a spiral protrusion is formed on the outer side of the outer winding layer 21. This protective layer 22 is for receiving an external impact at this protrusion, and thereby, the outer winding layer 21 and each part inside thereof are protected from the external impact.

Next, a state where the above-described flexible hose 1 is bent will be described. In general, in the flexible hose 1 in which the inner core 10 and the outer core 15 are not fixed, the spiral core is liable to be displaced in a curved state. FIG. 3 is a schematic view showing a state when the hose 1 is bent.
Fig.3 (a) is a schematic diagram of the part curved in the direction in which the adjacent inner cores 10 (outer cores 15) leave | separate (outside of a curved part).
The restraint layer 16 is more tensioned than the state in which the flexible hose 1 is free (not bent), and strongly presses the outer core 15 in the inner direction. As described above, the outer peripheral surface side of the outer core 15 is fused to the constraining layer 16. For this reason, the distance between the outer peripheral surfaces of the outer cores 15 cannot be increased against the constrained constraining layer 16, and therefore it cannot be bent by deformation that increases the distance between these parts as compared to the free state. Therefore, in order for the hose 1 to bend at this portion, the hose 1 is deformed so that the gap (play) between the outer core 15 and the inner core 10 is reduced in the vicinity of the inner peripheral surface side of the outer core 15. As the deflection increases, the inner core 10 is sandwiched between the left and right outer cores 15 (via the tube body 11), and the inner core 10 is twisted or rotated in the direction of the helical axis that triggers misalignment. It becomes difficult to occur. Furthermore, twisting and rotation are less likely to occur by making the cross-sectional shape of the inner core 10 square. In this way, the inner core 10 and the outer core 15 do not get over the convex surface by approaching and contacting the adjacent cores.

FIG. 3B is a schematic diagram of a portion curved in a direction in which adjacent inner cores 10 (outer cores 15) approach each other (inside the curved portion).
The constraining layer 16 is less tensioned than when the flexible hose 1 is free. As the flexure increases, the tension is not applied, but the outer cores 15 approach each other and the inner cores 10 approach each other. As a result, the outer core 15 and the inner core 10 are sandwiched with each other (via the left and right tube bodies 11). Accordingly, the inner core 10 and the outer core 15 are restricted from being further deformed (twisted and rotated), so that no displacement occurs. Since the outer core 15 is also sandwiched from both sides, the positional deviation is less likely to occur.

The above is for the outer core 15, but also for the inner core 10, the outer core 15 presses the tube main body 11, and the inner core 10 is pressed by the tube main body 11, so that misalignment hardly occurs. Further, since the inner core 10 is rectangular and the resistance to get over the convex surface is increased, this also prevents misalignment. Further, when the angle of bending increases in the state shown in FIG. 3B, the inner core 10 is also sandwiched by the adjacent outer cores 15 and cannot move vertically and horizontally, so that the same positional displacement as the outer core 15 occurs. Disappear.

FIG. 4 is an exploded perspective view showing a partial cross section of a flexible hose 2 according to another embodiment of the present invention. The same components as those in FIG. 2 are denoted by the same reference numerals, and a part of the description is omitted.
In this embodiment, the outer core 25 has a cross-sectional shape similar to that of the inner core 10. The embodiment of FIG. 2 is superior in flexibility, and in contrast to this, the embodiment of FIG. 4 is somewhat inferior in flexibility, but the inner core 10 and the outer core 25 are rectangular. Therefore, the structure is difficult to buckle. Therefore, the one shown in FIG. 4 has a large hose diameter and is suitable for applications requiring pressure resistance and shape retention.
Further, in FIG. 4, a metal wire conductor 23 as a ground wire is embedded in the protective layer 22, so that safety against static electricity can be ensured.

(Modified embodiment)
Next, the flexible hose with a pipe end joint that uses the flexible hose together with the pipe end joint will be described.
When actually using the flexible hose as described above, it may be connected to other flexible hoses or connected to various devices, etc. It is also used for installation. As a joint structure of this type of pipe end joint, a packing is provided between the flexible hose and the fastening means, and the packing is pressed by the fastening means so that the flexible hose is brought into close contact with the nipple and stopped. Those that ensure aqueous properties are known (see, for example, JP-A-5-302691).

The packing of the pipe end joint described in the document is cut by being provided with a substantially Z-shaped slit so as to be a discontinuous annular body in the circumferential direction. Therefore, the diameter of the packing can be increased or decreased, and the diameter of the packing can be freely changed according to the tightening by the tightening means, and the tube can be brought into close contact with the nipple.

However, in the packing, when the pipe end joint is attached to the pipe end, the movement of the edge parts facing each other (the ends where the substantially Z-shaped slit surfaces face each other) in a direction away from each other is restricted. Since there is no means, the edge end portion freely moves in the packing circumferential direction, and the shape (annular shape) of the packing is easily broken. Therefore, compared to packings that are annular bodies that are continuous in the circumferential direction, the handling of the joints is complicated in the assembly and disassembly operations, and particularly during assembly, if the packing shape collapses, the water stoppage is affected. It was necessary to pay close attention to maintain the shape.

Also, in the case of packing cut in the circumferential direction into a discontinuous annular body, if the tube body of the flexible hose (tubing body) is composed of a film layer that is liable to be loosened or wrinkled, for example, When the diameter is reduced, an excess portion of the film caused by the difference between the nipple diameter and the film diameter is gathered between the slits. Since the collected film surplus portion is located between the slits, it is difficult to be pressed by the packing and causes leakage, but the diameter expansion range is not regulated as in the packing of the above-mentioned document. Since the difference between the time and the diameter reduction tends to be large, the gathering tends to be large, and it is difficult to stably obtain the water stoppage.

Therefore, the following configuration is adopted as a flexible hose with a pipe end joint to which a pipe end joint capable of easily and surely performing connection work is suppressed while suppressing unlimited diameter expansion and deformation of the packing. I did it.

That is, a flexible hose with a pipe end joint according to another embodiment of the present invention includes a flexible hose 1 as described with reference to FIGS. 1 to 4 and an end of the flexible hose 1. A flexible hose with a pipe end joint comprising a pipe end joint 100 to be attached to the section, wherein the pipe end joint 100 includes a nipple 200 fitted into the flexible hose 1 and the flexible hose 1. And a fastening means 400 that tightens the packing 310 from the outside and presses the inner peripheral surface of the flexible hose 1 against the outer peripheral surface of the nipple 200, and the packing 310 has a slit 320. Thus, the annular body is discontinuous in the circumferential direction, and the engaging edge 330 that restricts the movement in the direction away from each other in the engaged state is provided at the edge portions facing each other.

According to the flexible hose with a pipe end joint of the present invention, the engagement of the engagement means 330 restricts the movement of the edge portions in the direction away from each other. The expansion of the diameter is suppressed, the packing shape is not easily collapsed, and handling during assembly and disassembly becomes easy.

Here, the engaging means 330 may specifically be flanges formed at the edge portions so as to be engageable with each other.
Since the engaging means 330 is a flange formed at the edge so that they can engage with each other, the shape of the non-pressure contact portion generated between the edges becomes complicated, and the slit 320 is linear in the packing axial direction. The water-stopping property is improved as compared with the case where it is formed.

Further, only the tube main body 11 is extended from the tube end 5 of the flexible hose 1, the tube main body 11 is formed of a film layer, and the packing 310 is externally fitted to the extended tube main body 11. You may make it do. Even when the tube body 11 is made of only a film layer that is likely to be loosened or wrinkled, the film layer is picked up when the packing is contracted by the fastening means (the difference between the nipple diameter and the film diameter). ) Can be prevented, and leakage due to picking up can be prevented.

Here, the packing 310 may be provided with a notch 330a in accordance with the shape of the tube end 5. Specifically, the tube end 5 is formed in a spiral shape along the

outer cores

15 and 25 of the flexible hose 1 or the inner core 10, and the outer core or the inner core located at the outermost end is formed. A step 5a corresponding to the helical pitch is formed by cutting the flexible hose 1 in the axial direction, and the notch 330a of the packing 310 is matched to the spiral of the tube end 5 and the shape of the step 5a. It may be provided.

By providing a notch according to the spiral and step shape of the tube end 5, not only the film layer at a position away from the tube end 5 but also the film layer near the tube end can be surely pressed against the nipple 200. It is possible to suppress the swelling of the film layer due to the internal pressure and improve the water-stopping property.

Further, the packing 310 has a stepped portion 330b that can be engaged with the stepped portion 5a of the pipe end 5 by approaching any one of the flanges 330 formed at the edge ends so as to be engageable with each other. The flange portion 330 on the side where the stepped portion 330b is provided close to the tube end 5 is opened opposite to the tube end 5, and the stepped portion 330b is engaged with the step 5a of the tube end 5. In this state, it may be possible to engage with the other flange 330.
Thus, since the opening of the flange portion on the side where the step portion 330b is provided is directed to the side opposite to the tube end 5, the flange portion is engaged with the step portion of the packing 310 to the tube end 5. They can be engaged with each other, and the packing 310 can be easily attached without being displaced.

Furthermore, in addition to the packing 310, the annular body is continuous in the circumferential direction, and is fitted onto the end of the flexible hose 1 and locked to the tightening means 400. The flexible hose 1 may be provided with a retaining packing 340 that prevents the flexible hose 1 from coming off from the nipple 200.
Accordingly, it is possible to reliably prevent the flexible hose 1 from coming off from the nipple 200 while ensuring high water-stopping properties.

Here, in particular, the flexible hose 1 is formed with a spiral protective layer 22 on the outermost periphery, and the retaining packing 340 that is a continuous annular body in the circumferential direction is formed by extending the tube. The main body 11 may be screwed to the protective layer 22 in the vicinity of the base end portion.
Thus, the durability against pulling out can be improved by screwing the retaining packing (340).

Hereinafter, an embodiment of a flexible hose with a pipe end joint which is a modified embodiment will be described based on the drawings.
5 to 8, the flexible hose 1 is used, for example, as a food transport hose. Here, the same flexible hose 1 as shown in FIG. 1 or FIG. 3 is used. That is, the flexible hose 1 includes, as in FIG. 1, an inner core 10, a tube main body 11 formed of a film layer, an outer core 15, and a constraining layer 16 as basic components, and further a yarn distribution layer 20 on the outer side. An outer winding layer 21 and a spiral protective layer 22 are provided.
In addition, the end part of the flexible hose 1 is called the pipe end 5 for convenience of explaining the relationship with the pipe end joint attached to the end part of the flexible hose 1 that is a tubular body. Here, the pipe end 5 refers to the position of the inner core 10 or the outer core 15 at the end of the tube body 11 around which the inner core 10 and the outer core 15 are wound.

The pipe end joint 100 is provided at the end of the flexible hose 1, and is, for example, a joint (hereinafter referred to as “others”) attached to various devices such as a joint attached to the end of another flexible hose or a storage tank. It is used for the connection with the joint. The pipe end joint 100 is fitted into the end of the flexible hose 1 to connect to other joints, a nipple 200 to be externally fitted to the flexible hose 1, and the packing 300. Tightening means (holder) 400 that presses the inner peripheral surface of the packing 300 against the outer peripheral surface of the flexible hose 1 and presses the inner peripheral surface of the flexible hose 1 against the outer peripheral surface of the nipple 200 by tightening from the outside. And.

The nipple 200 is made of, for example, stainless steel, and is formed in a substantially cylindrical shape as shown in FIG. Further, one end side in the axial direction of the nipple 200 is, for example, a straight tube-shaped fitting tube portion 210 that is fitted into the end portion of the flexible hose 1, and the other end side is connected to another joint, for example, a connecting portion with a screw portion. 220. In addition, an annular flange portion 230 protrudes in a radially outward direction at an intermediate portion between the fitting cylinder portion 210 and the connection portion 220 of the nipple 200.

The packing 300 is made of, for example, synthetic rubber, and includes two types of packings, namely, a water stopping packing 310 and a retaining packing 340.

As shown in FIG. 9, the water-stop packing 310 is formed as an annular body that is discontinuous in the circumferential direction by the slits 320, and in the engaged state, the end edges facing each other are separated from each other. Engagement means 330 is provided for restricting movement of a predetermined amount or more. Specifically, the engagement means 330 is a flange portion formed at each edge portion so as to be engageable with each other. Further, a gap corresponding to the width of the slit 320 is generated between the

flanges

330 and 330 in the engaged state, and the gap can be moved in the packing circumferential direction by the width of the slit 320. In addition, the inner peripheral surface of the water-stop packing 310 is smoothed according to the fitting cylinder part 210 of the nipple 200 whose outer peripheral surface is smooth.

As shown in FIG. 10 (and FIG. 8), the retaining packing 340 is an annular body that is continuous in the circumferential direction, and the inner circumferential surface thereof has irregularities (that is, a protective layer) on the outer circumferential surface of the flexible hose 1. The groove portion 350 corresponding to 22 spiral-shaped irregularities is formed in a spiral shape and can be screwed into the flexible hose 1.

The holder 400 includes a pair of halved

exterior bodies

410 and 410 that are assembled so as to sandwich the end of the flexible hose 1 from the outside. The pair of half-split

outer bodies

410 and 410 are made of, for example, stainless steel and have substantially the same shape as shown in FIGS. 5 and 6, and a substantially half-cylinder main body 420 and the main body 420. A pair of connecting

portions

480 and 480 are provided radially outward from both end portions along the axial direction (front-rear direction). In addition, Fig.11 (a) has shown the outer peripheral surface side of the halved exterior body 410, and FIG.11 (b) has shown the inner peripheral surface side.

Three

linear protrusions

430, 440, and 450 are formed on the inner peripheral surface of the main body 420 in parallel with each other along the circumferential direction. The flange portion 230 of the nipple 200 is loosely fitted into a small fitting groove 460 formed between the

linear protrusions

430 and 440. Further, the large mounting groove 470 formed between the

linear protrusions

440 and 450 can be further provided with a water-stop packing 310 in the shallow groove portion 470a and a retainer packing 340 in the deep groove portion 470b.

A pair of bolt insertion holes 490 and 490 are formed in the pair of connecting

portions

480 and 480 at intervals in the axial direction (front-rear direction), respectively. In addition, an inner surface that is continuous with the inner peripheral surface of the main body 420 in the connecting portion 480 is an overlapping surface when the holder 400 is assembled.

Next, a procedure for attaching the pipe end joint 100 having the above configuration to the end portion of the flexible hose 1 will be described. First, the inner core 10 and the outer core 15 at the end of the flexible hose 1 are removed within a certain range (about the width in the axial direction of the water-stop packing 310), and only the tube body 11 of the film layer from the tube end 5 is removed. And a retaining gasket is externally fitted to a portion of the tube body 11 in the vicinity of the base end portion where the inner core 10 and the outer core 15 are not removed, and the protective layer 22 is screwed. To wear. Next, the fitting of the nipple 200 to the end of the flexible hose 1 is completed by fitting the tube main body 11 extended from the tube end 5 to the fitting cylinder portion 210 of the nipple 200. At this time, the retaining packing 340 is made to face the fitting cylinder portion 210 of the nipple 200 through the flexible hose 1.

Subsequently, the water-stop packing 310 is fitted on the tube body 11. That is, the inner peripheral surface of the water stop packing 310 is brought into contact with the outside of the tube main body 11 so as to hold the tube main body 11 positioned between the flange portion 230 of the nipple 200 and the retaining packing 340. Further, in this state, the

flanges

330 and 330 are engaged with each other to prevent the water-stop packing 310 from unexpectedly dropping and the packing shape from collapsing. In addition to the above attachment procedure, the water-stop packing 310 is previously attached to the tube main body 11 before fitting the tube main body 11 or the end of the flexible hose 1 to the fitting cylindrical part 210 of the nipple 200. You may make it fit externally.

Next, the half armor 410 is assembled to the end of the flexible hose 1 to which the nipple 200 is attached. At the time of this assembly, a large gap formed between the

linear protrusions

440 and 450 so that the flange portion 230 of the nipple 200 is loosely fitted into a small fitting groove 460 formed between the

linear protrusions

430 and 440. Among the mounting grooves 470, the end of the flexible hose 1 is sandwiched so that the water-stop packing 310 is located in the shallow groove 470 a and the retainer packing 340 is located in the deep groove 470 b. Then, the pair of upper and lower halved

outer bodies

410 and 410 are overlapped, and the nut 510 is screwed and tightened to the bolt 500 inserted into the bolt insertion hole 490 of the connecting portion 480.

At this time, the water-stopping packing 310 is gradually reduced in diameter as the holder 400 is tightened, and the tube main body 11 is brought into close contact with the fitting cylinder portion 210 of the nipple 200 without a gap.

Further, the retaining packing 340 is locked (contacted) with the linear protrusion 450 provided on the most flexible hose 1 side of the half-wrapped outer body 410, and the flexible hose from the nipple 200 is placed. It will resist the loss of 1.

In this way, by attaching the halved

outer casings

410 and 410 and tightening the packing 300 from the outside, the ends of the tube main body 11 and the flexible hose 1 are pressed against the fitting cylinder portion 210 of the nipple 200. The nipple 200 is fixed to the end of the flexible hose 1, and the attachment of the pipe end joint 100 is completed.

In the joint structure having the above-described configuration, in addition to the water-stopping packing 310 that is a ring that is discontinuous in the circumferential direction, the seal structure 340 that is a ring that is continuous in the circumferential direction is provided. Can be reliably prevented from coming off the flexible hose 1 from the nipple 200. Specifically, the force acting in the direction in which the flexible hose 1 is pulled out is the packing 340 for retaining from the flexible hose 1, the linear protrusion 450 of the holder 400, the main body 420 of the holder 400, and the wire of the holder 400. Is transmitted through a path such as the projection 430 and the flange portion 230 of the nipple 200, so that the force in the pulling direction of the flexible hose 1 hardly acts on the water stop packing 310, and the water stop packing 310 is deformed. Even if the force acts because the retaining gasket 340 is a continuous annular body and is screwed to the flexible hose 1, High durability can be exhibited because it is difficult to be deformed and is not easily displaced.

Also, the pipe end joint 100 requires periodic maintenance such as cleaning and inspection. In this case, the pipe end joint 100 is removed from the end of the flexible hose 1 and disassembled, cleaned and inspected, and then the pipe end joint 100 is attached to the end of the flexible hose 1 again. However, at this time, the engagement of the flange portion 330 of the water-stop packing 310 restricts the movement of the edge portions in the direction away from each other, so that excessive expansion of the packing 310 is suppressed, and the packing is suppressed. The shape is difficult to collapse, and handling during assembly and disassembly becomes easy. Further, since the expansion of the water stop packing 310 is suppressed to a predetermined amount (slit width), even if the water stop packing n310 is externally fitted to the tube body 11 of the film layer that is likely to be loosened or wrinkled, the holder 400 It is possible to suppress the pick-up of the tube body 11 when the diameter of the water-stop packing 310 is reduced (collection of surplus film portions caused by the difference between the nipple diameter and the tube body diameter), and to prevent leakage due to the pick-up. Can be prevented. And since the shape of the non-pressure-contact part which arises between edge parts becomes complicated with a bowl shape, it can maintain a high water-stopping whatever slit part 320 is located in the circumferential direction of the tube main body 11. FIG.

Next, further different embodiments of the present invention will be described in detail. FIG. 12 is a view showing only the flexible hose 1 and the water-stop packing 310 for the sake of simplicity of explanation, but the inner core 10 which is a reinforcing core when the tube body 11 is extended from the tube end 5 and In order to remove the outer core 15, it is easier to cut in the axial direction than in the circumferential direction of the flexible hose 1. However, when such a cutting method is adopted, the tube end 5 is spiraled along the inner core 10 or the outer core 15, and the step 5a corresponding to the helical pitch (the tip of the reinforcing core cut in FIG. 12). (Indicated by a dotted line connecting the reinforcing core side portion at a position shifted by one pitch in the axial direction).

Therefore, when the end face on the pipe end 5 side is parallel to the circumferential direction as in the water stop packing 310 shown in FIG. 9, the water stop packing 310 is provided between the water stop packing 310 and the pipe end 5. As a result, the tube main body 11 which is not pressed against is formed. Since this portion is not supported by the inner core 10 and the outer core 15, the durability against the internal pressure is poor, causing leakage.

Therefore, a notch 330a is provided at the end of the water stop packing 310 on the tube end 5 side so as to match the shape of the spiral or step 5a of the tube end 5 so that the tube main body 11 can be reliably pressed from the tube end 5. Yes.

Further, when engaging the flanges 310 of the water-stopping packing 310 with each other, a stepped portion 330b is provided so that the stepped portion 330b of the water-stopping packing 310 and the step 5a of the pipe end 5 are not displaced. In the state where the opening 330c of the flange portion 330 on the side is opened to the side opposite to the tube end 5 and the stepped portion 330b of the water-stop packing 310 and the stepped portion of the tube end 5 are in contact (engaged), It is comprised so that the collar part 330 can be engaged.

Although specific embodiments have been described above, the present invention is not limited to the above embodiments, and it is needless to say that many modifications and changes are made to the above embodiments within the scope of the present invention.

For example, the water-stop packing is not limited to that shown in FIGS. 9 and 12, and may have the form shown in FIG. 13. In the water-stop packing 310 shown in FIG. 13A, no slit width is provided, and movement in the circumferential direction is restricted. In such a water-stopping packing, the tube body 11 is not picked up at all, and therefore leakage due to the pick-up can be reliably prevented. Moreover, in the water stop packing 310 shown in FIG. 13B, since the return portion 330d is provided, the movement in the axial direction is restricted, and the shape of the packing is more difficult to collapse. In the water-stop packing 310 shown in FIG. 13 (c), the engaging means 330 is shaped so as to be provided symmetrically when the collar is viewed from the side of the packing, and the wide tip 330e is the tip. Engagement with an engagement hole 330f provided in accordance with the shape of the wide portion 330e restricts movement in the circumferential direction. FIG. 13 (d) is provided with a plurality of wide end portions 330e and engaging holes 330f. The shape of the engaging means 330 is not limited to the above shape, and various shapes can be used.

Further, the holder 400 is not limited to the above-described halved structure, but may be a band plate shape or a C-shape wound around the outer side of the packing 300, and may be tightened by caulking. As the flexible hose 1, a tube provided with an outer skin or a reinforcing core on the outside of the tube main body 11, the inner core 10, and the outer core 15 may be used.

The present invention can be used as an all-resin flexible pressure-resistant hose.

1 Flexible hose 5 Tube end 10 Inner core (PP)
11 Tube body 12 Film layer (fluororesin)
13 Film layer (PP)
14 Film layer (Fluororesin)
15 Outer core (PE)
16 Constrained layer 17 Elastomer layer 18 Woven yarn layer (polyester yarn)
19 Elastomer layer 20 Distribution layer (polyester yarn)
21 Outer winding layer 22 Protective layer 23 Ground wire 100 Pipe end joint 200 Nipple 310 Water-proof packing 320 Slit 330 Engagement means (buttock)
330a Notch portion 330b Stepped portion 340 Retaining prevention packing 400 Tightening means (holder)

Claims

The inner core (10) formed in a spiral shape is covered with the tube main body (11), and the outer cores (15, 25) formed in a spiral shape on the tube main body (11) are connected to the inner core (10). A flexible hose (1) in which a spiral concavo-convex surface is formed on the tube body (11) by being wound so as to form a double spiral structure,
The inner core (10) is formed into a square cross section by a resin material,
The tube body (11) is seamlessly molded from a resin material,
The outer core (15, 25) is formed of a resin material,
Further, on the outer side of the outer core (15, 25), the outer peripheral surface of the outer core (15, 25) is covered so as to be inwardly pressed and fused to the outer peripheral surface of the outer core (15, 25), A constraining layer (16) is formed that suppresses the radial expansion of the outer core (15, 25) and the inner core (10) and restricts the movement width of the outer core (15, 25). A flexible hose.
The flexible hose according to claim 1, wherein the constraining layer is formed of a woven yarn layer and an elastomer layer that sandwiches the woven yarn layer from the front and back sides and gives elasticity.
The flexible hose according to claim 1 or 2, wherein a cross section of the outer core is formed in a square shape.
The flexible hose according to claim 1 or 2, wherein a cross section of the outer core is formed into a circle or an ellipse.
A gap for enabling bending is provided between the outer core and the inner core adjacent to each other, and the gap is set so as to be in contact with the tube body in the most curved state. The flexible hose according to any one of claims 1 to 4.
The flexible hose (1) according to any one of claims 1 to 5, wherein a spiral protective layer (22) is formed on an outermost periphery of the flexible hose (1).
A pipe end joint with a pipe end joint comprising the flexible hose (1) according to any one of claims 1 to 6 and a pipe end joint (100) attached to an end of the flexible hose (1). A flexible hose,
The pipe end joint (100) includes a nipple (200) fitted inside the flexible hose (1), a packing (310) fitted outside the flexible hose (1), and the packing (310). Tightening means (400) for tightening the outer peripheral surface of the flexible hose (1) by pressing the inner peripheral surface of the flexible hose (1) against the outer peripheral surface of the nipple (200),
The packing (310) is formed in a ring shape discontinuous in the circumferential direction by a slit (320), and engaging means (330) for restricting movement in directions away from each other at the edge portions facing each other. ) Flexible hose with a pipe end joint.
The flexible hose with a pipe end joint according to claim 7, wherein the engaging means (330) are flanges formed at edge portions so as to be engageable with each other.
Only the tube body (11) extends from the tube end (5) of the flexible hose (1), and the tube body (11) is composed of a film layer,
The flexible hose with a pipe end joint according to any one of claims 7 and 8, wherein the packing (310) is externally fitted to the extended tube body (11).
The flexible hose with a pipe end joint according to claim 9, wherein the packing (310) is provided with a notch (330a) according to the shape of the pipe end (5).
The tube end (5) is formed in a spiral shape along the outer core (15, 25) or the inner core (10), and the outer core or the inner core located at the outermost end is a flexible hose ( The step (5a) corresponding to the helical pitch is formed by cutting in the axial direction of 1), and the notch (330a) of the packing (310) is formed by the spiral and the step (5) of the pipe end (5). The flexible hose with a pipe end joint according to claim 10, which is provided in accordance with the shape of 5a).
The packing (310) approaches either one of the flanges (330) formed at the edge ends so as to be engageable with each other, and engages with the step (5a) of the pipe end (5). A stepped portion (330b) capable of being joined is provided, and the flange portion (330) on the side where the stepped portion (330b) is provided close to the tube end (5) is opened opposite to the above-described tube end (5). 12. With a pipe end joint according to claim 11, wherein the step (330b) is engageable with the other flange (330) in a state where the step (330b) is engaged with the step (5a) of the pipe end (5). Flexible hose.
In addition to the packing (310), it is an annular body that is continuous in the circumferential direction, and is fitted on the end of the flexible hose (1) and locked to the fastening means (400). The flexible hose with a pipe end joint according to any one of claims 9 to 12, further comprising a retaining packing (340) for preventing the flexible hose (1) from coming off from the nipple (200). .
The flexible hose (1) has a spiral protective layer (22) formed on the outermost periphery, and the retainer packing (340) formed into a continuous annular body in the circumferential direction extends from the extension. The flexible hose with a pipe end joint according to claim 13, wherein the flexible hose is screwed to the protective layer (22) in the vicinity of the proximal end portion of the tube main body (11).