JP2013104511A5 - - Google Patents

Description

Laminated reinforcement hose

  The present invention relates to a silicone laminated reinforcing hose excellent in pressure resistance used in food, beverages, medical equipment, chemistry and other industries, and a laminated reinforcing hose excellent in pressure resistance made of other materials.

Conventionally, as this type of laminated reinforcing hose, a reinforcing layer in which reinforcing yarns or reinforcing fibers are knitted in a cylindrical shape is provided between an inner layer and an outer layer, and a coil is spiraled along the reinforcing layer on the outside thereof. some of the wound (e.g., see Patent Document 1).

JP 2006-183868 A

However, in such a conventional laminated reinforcing hose, if a part of the hose in the axial direction is bent with a very large force, or a part of the hose in the axial direction is subjected to a very large compressive load in the radial direction. Such a concentrated load application part is partially flattened in the radial direction and easily compressed and deformed into a substantially elliptical cross section, thereby reducing the area of the internal flow path in a part of the hose. There is a risk that the fluid passing through the cylinder will become clogged, and the pressure in the hose (internal pressure) will rise to cause an accident such as hose disconnection.
Further, with the partial flattened crushing of the hose, the coil is similarly crushed in a flat shape in the radial direction so as to be compressed and deformed into a substantially elliptical cross section. The two parts orthogonal to each other are bent into a generally U shape and sharpened, and each protrudes in the radial direction toward the outer layer.
At that time, especially when the outer layer is made of a material that is very easy to tear, such as silicone rubber, when the coil is bent into a generally U shape and a sharp point hits the outer layer, the outer layer bites into the outer layer and breaks are formed. There was also a possibility that the coil would break through the outer layer and jump out, making it unusable.

  An object of the present invention is to cope with such a problem, and an object of the present invention is to prevent the outer layer from being torn by compressive deformation of the coil accompanying the partial deformation of the hose in the radial direction. To do.

In order to achieve such an object, the present invention provides an inner layer formed of a flexible material containing a silicone rubber or a soft synthetic resin as a main component in a cylindrical shape, and a reinforcing yarn or reinforcement along the outer peripheral surface of the inner layer. A first reinforcing layer laminated by knit knitting the fiber into a stretchable cylinder, a coil formed by spirally winding a wire along the outer side of the first reinforcing layer, and the outer side of the coil laminated and a second reinforcing layer laminated by knit, into a cylindrical shape by the flexible material along the outside of the second reinforcing layer freely tubular elastic reinforcing yarn or reinforcing fibers along the and an outer layer that, integrally includes the first reinforcing layer and the second reinforcing layer includes a warp knit rows extending in the axial direction of the hose, and weft knitted rows intersect to extend in the circumferential direction of the hose Is stretchably knitted, and the longitudinal length in the first reinforcing layer is Than the stitches of the observed sequence and the weft knitted row, characterized in that finely towards the stitches of the warp knit string and the weft knitted rows in said second reinforcing layer.

In the present invention having the above-described features, the reinforcing yarn or the reinforcing fiber of the second reinforcing layer is knitted into a cylindrical shape along the outer side of the coil and integrally laminated, and the outer layer is formed along the outer side of the second reinforcing layer. Since the second reinforcing layer is disposed between the coil and the outer layer so as to cover the outer periphery of the coil by laminating them integrally, a part of the hose is partially deformed in the radial direction, and the coil Even if a part of the axial direction in this part is flattened in the radial direction and is compressed and deformed into an approximately elliptical cross section, the pointed portion that is bent into a generally square shape directly hits the inner surface of the outer layer. Therefore, it is possible to prevent the outer layer from being broken due to the compression deformation of the coil accompanying the partial deformation of the hose in the radial direction.
As a result, compared with the conventional reinforcing yarns or reinforcing fibers it is not provided with a second reinforcing layer which is knit in a tubular shape, very tear easily potatoes, such as flexible material constituting the outer layer and silicone rubber Even in this case, the coiled portion of the coil that is bent into a generally U-shape does not break through the outer layer, and can be used for a long period of time.

It is explanatory drawing (partially notched perspective view) of the lamination | stacking reinforcement hose which concerns on embodiment of this invention. It is explanatory drawing which shows the test method of allowable bending radius measurement. It is explanatory drawing which shows the method of a compression crushing test. It is explanatory drawing which shows the method of a compression bending test.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, a laminated reinforcing hose A according to an embodiment of the present invention includes a inner layer 1 formed in a cylindrical shape with a flexible material, and reinforcing yarns or reinforcing fibers along the outer peripheral surface 1 a of the inner layer 1. A first reinforcing layer 2 formed by knitting into a cylindrical shape, a coil 3 formed by winding a wire in a spiral shape along the outside of the first reinforcing layer 2, and along the outside of the coil 3 A second reinforcing layer 4 formed by knitting a reinforcing thread or a reinforcing fiber into a cylindrical shape, and an outer layer 5 formed in a cylindrical shape by a flexible material along the outside of the second reinforcing layer 4. Is integrated.

The inner layer 1 and the outer layer 5 are formed of a flexible material whose main component is excellent in flexibility such as silicone rubber, other rubber, or soft synthetic resin. As the color of the flexible material, it is preferable to use a transparent or translucent material so that a fluid passing through the laminated reinforcing hose A can be seen.
As a manufacturing method of the inner layer 1 and the outer layer 5, it is preferable to extrude each of the inner layer 1 and the outer layer 5 using, for example, an extrusion molding apparatus as disclosed in JP-A-8-207110.
Although not shown if necessary, inside the inner layer 1, the innermost layer or laminated to a flexible material suitable for fluid passing through the laminate reinforced hose A, on the outside of the outer layer 5, The outermost layer made of a flexible material suitable for protection can be laminated or formed.

The first reinforcing layer 2 and the second reinforcing layer 4 are knitted in a cylindrical shape in the axial direction of the laminated reinforcing hose A by a braiding machine (not shown) using a reinforcing yarn such as polyester, nylon or aramid fiber or a reinforcing fiber. It is formed by doing.
More specifically, the first reinforcing layer 2 and the second reinforcing layer 4 include warp knitting rows 2a and 4a extending in the axial direction of the laminated reinforcing hose A and weft knitting extending in the circumferential direction of the laminated reinforcing hose A. The rows 2b and 4b are knitted to be stretchable.

The knitting directions of the warp knitting row 2a and the weft knitting row 2b of the first reinforcing layer 2 and the warp knitting row 4a and the weft knitting row 4b of the second reinforcing layer 4 are the same as those of the laminated reinforcing hose A shown in the illustrated example. It is preferable that the laminated reinforcing hose A is wound at a predetermined angle from the axial direction so as to be spirally wound so that the forces acting on the warp knitting rows 2a and 4a and the weft knitting rows 2b and 4b are balanced.
Further, in the illustrated example, the warp knitting rows 2a, 4a are inclined at an appropriate angle with respect to the axial direction of the laminated reinforcing hose A and are knitted in a spiral shape, and the warp knitting rows 2b, 4a 4b is knitted so as to be substantially orthogonal.
Although not shown as another example, it is possible to incline the intersecting angle of the warp knitting rows 2a, 4a and the weft knitting rows 2b, 4b to an appropriate angle other than a substantially right angle.

The coil 3 is configured by winding a wire made of a hard rust metal such as stainless steel or a hard fiber such as a monofilament (stretched monofilament) or a hard synthetic resin in a spiral shape. When a monofilament is used, it is less rusting than a metal wire, and the laminated reinforcing hose A can be easily cut and reduced in weight.
As a method of manufacturing the coil 3, a stationary wire led from a coil molding machine (not shown) or a coil storage part (not shown) is continuously supplied at a set speed in the axial direction of the laminated reinforcing hose A, and the coil 3 is spirally wound. It is preferable to wind in the shape.
Further, as the coil forming machine, it is preferable to use, for example, a machine that continuously winds a coil in a state where no elastic repulsion remains when winding a wire as disclosed in JP-A-61-144230. .

  Further, as shown in FIG. 1, the first intermediate layer 6 made of the same kind of flexible material as the inner layer 1 and the outer layer 5 such as silicone rubber is interposed between the first reinforcing layer 2 and the coil 3. And a second intermediate layer 7 whose main component is made of the same kind of flexible material as the inner layer 1 and the outer layer 5 such as silicone rubber is laminated between the coil 3 and the second reinforcing layer 4. preferable.

And as a specific example of the manufacturing method for producing the laminated reinforcing hose A according to the embodiment of the present invention, first, after the inner layer 1 is extruded, the first along the smooth outer peripheral surface 1a. The reinforcing yarn or the reinforcing fiber (the warp knitting row 2a and the weft knitting row 2b) of the reinforcing layer 2 is wound, and if necessary, the outer side of the first reinforcing layer 2 is a first intermediate in a molten state that is extruded to the outside. By laminating the layers 6, the layers are cured and laminated on the outer periphery of the first reinforcing layer 2.
Next, the first intermediate layer 6 is spirally wound along the coil 3 along the smooth outer peripheral surface 6a, and the outer side of the coil 3 is melted by being extruded outside the coil 3 as necessary. By stacking the two intermediate layers 7, the outer periphery of the coil 3 is cured and laminated.
Thereafter, the reinforcing yarns or reinforcing fibers (warp knitting rows 4 a and weft knitting rows 4 b) of the second reinforcing layer 4 are wound along the smooth outer peripheral surface 7 a of the second intermediate layer 7, and are wound outside the second reinforcing layer 4. Is laminated on the outer periphery of the second reinforcing layer 4 by stacking the melted outer layer 5 extruded on the outside.

According to such a laminated reinforcing hose A according to the embodiment of the present invention, as shown in FIG. 1, the second reinforcing layer 4 is disposed between the coil 3 and the outer layer 5 so as to cover the outer periphery of the coil 3. Therefore, a part of the axial direction in the coil 3 is forced to be partially bent in the axial direction of the laminated reinforcing hose A or a compressive load is applied to a part of the axial direction of the laminated reinforcing hose A in the radial direction. Even if the portion is partially flattened in the radial direction and compressed and deformed to have a substantially elliptical cross section, the pointed portion that is bent into a generally square shape directly hits the inner surface 5a of the outer layer 5 and bites into it. There is no.
Thereby, the tearing of the outer layer 5 due to the compressive deformation of the coil 3 accompanying the partial deformation of the laminated reinforcing hose A in the radial direction can be prevented.
Therefore, flexible material constituting the outer layer 5 is even the potato very torn easily such as silicone rubber, which pointed parts are bent to shape the substantially dog in the coil 3 pops breaks through the outer layer 5 And can be used for a long time.

In particular, when the first intermediate layer 6 is laminated between the first reinforcing layer 2 and the coil 3 and the second intermediate layer 7 is laminated between the coil 3 and the second reinforcing layer 4, The coil 3 is spirally wound along the smooth outer peripheral surface 6a of the layer 6, and the reinforcing yarns or reinforcing fibers of the second reinforcing layer 4 are knit in a cylindrical shape along the smooth outer peripheral surface 7a of the second intermediate layer 7. Knitted.
Therefore, damage to the reinforcing yarn or the reinforcing fiber in the first reinforcing layer 2 and the second reinforcing layer 4 due to the contact of the coil 3 is prevented, and the winding pitch of the coil 3 and the braiding pitch of the second reinforcing layer 4 are made uniform, respectively. be able to.
Next, an embodiment of the present invention will be described with reference to the drawings.

  In this embodiment, as shown in FIG. 1, the inner layer 1, the first intermediate layer 6, the second intermediate layer 7, and the outer layer 5 are all extruded sequentially with silicone rubber whose main component is transparent. Between the intermediate layer 6, polyester, nylon, aramid fiber or the like is knitted into a tubular shape as the reinforcing yarn or reinforcing fiber (warp knitting row 2a and weft knitting row 2b) of the first reinforcing layer 2, and the first intermediate layer 6 A rust-resistant metal wire such as stainless steel is spirally wound as a coil 3 between 6 and the second intermediate layer 7, and between the outer layer 5 of the second intermediate layer 7 and the reinforcing yarn or reinforcing fiber of the second reinforcing layer 4 Polyester, nylon, aramid fiber or the like is knit knitted in a cylindrical shape as (the vertical knitting row 4a and the horizontal knitting row 4b).

In the example shown in FIG. 1, the weaving direction of the reinforcing yarn or reinforcing fiber (warp knitting row 2 a and weft knitting row 2 b) in the first reinforcing layer 2 and the reinforcing yarn or reinforcing fiber (warp knitting row) in the second reinforcing layer 4. The knitting directions of 4a and weft knitting row 4b) are reversed.
Further, the reinforcing yarns or reinforcing fibers (the warp knitting row 4a and the weft knitting row 4b) in the second reinforcing layer 4 rather than the stitches of the reinforcing yarns or reinforcing fibers (the warp knitting row 2a and the weft knitting row 2b) in the first reinforcing layer 2. by finely towards the stitch), the coil 3 is set to be difficult as the second reinforcing layer 4.
Further, the outer surface 5b of the outer layer 5 is provided with an identification line 8 having a color different from that of the outer layer 5 and extending in the axial direction of the laminated reinforcing hose A so that it can be distinguished from other hoses at a glance.
As a manufacturing method of the identification line 8, when the outer layer 5 is extruded, a color different from the color of the outer layer 5 is extruded into a strip shape, or a thermoplastic resin tape is thermocompression bonded to the outer surface 5b of the outer layer 5 to be integrated. It is preferable.

In this embodiment, the ratio of the winding pitch P of the coil 3 to the thickness T from the inner surface 1b of the inner layer 1 to the outer surface 5b of the outer layer 5 is set to 1.3 to 1.5: 1. The reduction of the allowable bending radius in A and the reduction of the crushing deformation with respect to the local compressive load are aimed at.
That is, when the thickness (wall thickness) D of the laminated reinforcing hose A is about 6.5 to 7.5 mm, the winding pitch P of the coil 3 is set to about 5.0 mm.

  For the performance test in the laminated reinforcing hose A according to the embodiment of the present invention, the second intermediate layer 7 and the second reinforcing layer 4 are not provided and the coil with respect to the thickness T is provided separately from the above-described setting embodiment. A plurality of comparative examples each having the same structure as the above example except that the ratio of the winding pitch P of 3 is set to about 0.75: 1 are prepared for each of these examples and comparative examples under the same measurement conditions. The allowable bending radius measurement test shown in FIG. 2, the compression crushing test shown in FIG. 3, the compression bending test shown in FIG. 4, and the water pressure test were performed.

In addition, the laminated reinforcing hose A of the example and the laminated reinforcing hose of the comparative example were prepared with both inner diameters set to predetermined dimensions (25 mm).
Furthermore, the laminated reinforcing hose of the comparative example has no second intermediate layer 7 and the second reinforcing layer 4 as compared with the laminated reinforcing hose A of the example, so the thickness (thickness) is reduced accordingly, and the actual measurement thereof In value, the thickness T was about 5.3 mm, and the coil winding pitch P was about 7.0 mm.

As shown in FIG. 2, the test method for measuring the allowable bending radius is that the example and the comparative example are bent in a curved shape at room temperature (23 ± 3 ° C.), and the outer diameter D of the hose is 10% flat. The bending radius R of the hose was measured.
As a result of the allowable bending radius measurement, the bending radius R of the example was about 70% smaller than the bending radius R of the comparative example.
Thereby, since the laminated reinforcing hose A of the example can be bent smaller than the comparative example, piping in a narrow place is possible, the piping length of the hose can be shortened, and the quality of the hose is improved.

As shown in FIG. 3, the compression crushing test is performed at room temperature (23 ± 3 ° C.) by applying a load L to a part of the axial direction of the examples and comparative examples and compressing them in the radial direction. The load for each rate and the flatness for each load were examined.
In addition, the load (N) when the flatness is 10%, 20%, 30%, 40%, and 50% was measured as the load for each flatness. Further, the flatness ratio (%) for each load when the load was 100 N, 200 N, 300 N, 400 N, and 500 N was also examined. The compression speed of the load L was set to 20 mm / min.
As a result of the compression crushing test, the example is about 1.3 to 1.8 times less likely to be crushed at the load for each flatness compared to the comparative example. It was about 2 to 1.9 times less likely to collapse.

As shown in FIG. 4, the compression bending test is performed by compressing and bending the example and the comparative example at room temperature (23 ± 3 ° C.), and the load for each set span S and the load span S at the maximum load. I investigated.
Incidentally, the load of each setting span S is the span S was measured 320mm, 280mm, 240mm, 20 0m m, a load (N) at the time of the 160 mm. The sample hose length was 400 mm, and the compression speed was set to 200 mm / min.
As a result of the compression bending test, the example is more easily bent by about 59 to 78% in the load for each set span S than the comparative example, and the load span S when the maximum load of the example is about 60 N is about 127 mm. On the other hand, when the maximum load of the comparative example was about 96 N, the load span S was about 151 mm, and kink (a phenomenon of crushing and clogging when bent) occurred.
Thereby, it turned out that the lamination | stacking reinforcement hose A of an Example bends with a load smaller than a comparative example, and a bending kink does not generate | occur | produce.

The test method of the water pressure resistance test is that the examples and comparative examples are submerged in water baths at a water temperature of 23 ° C. and 90 ° C., and the pressure applied to the hose is stepwise when used at normal temperature (23 ° C.) and when heated (90 ° C.) Measure the outer diameter change rate (%), axial elongation rate (%), and circumferential twist (turns / m), and increase the internal pressure of the hose. The breaking pressure when the reinforcing yarns or reinforcing fibers (the warp knitting rows 2a and 4a and the weft knitting rows 2b and 4b) of the one reinforcing layer 2 and the second reinforcing layer 4 were broken and broken was also measured.
The internal pressure was set to 0.5 MPa, 1.0 MPa, 1.5 MPa, and burst pressure (MPa).
As a result of the water pressure resistance test, the break pressure was about 1.4 times higher than that of the comparative example, but the outer diameter change rate was reduced by about 50% and the elongation rate was reduced by about 40%. .
As a result, it was found that the laminated reinforcing hose A of the example not only has a higher breaking pressure than the comparative example, but also has a smaller outer diameter change rate and elongation rate, which is advantageous for quantitative supply of fluid.

According to the laminated reinforcing hose A according to the embodiment of the present invention, the allowable bending radius of the hose is reduced, and at the same time, the deformation of the hose against the local compressive load is reduced.
Therefore, partial collapse of the hose can be improved.
As a result, the internal flow path of the hose is widely held, so that clogging of the fluid can be reduced, and the pressure inside the hose (internal pressure) is less likely to increase, so that accidents such as hose disconnection can be reduced. There is an advantage that it is possible to reduce the breakage of the coil.

Furthermore, as shown in the example, when the weaving direction of the reinforcing yarn or the reinforcing fiber in the first reinforcing layer 2 and the weaving direction of the reinforcing yarn or the reinforcing fiber in the second reinforcing layer 4 are reversed, the first The drawback that the reinforcing yarns or reinforcing fibers of the reinforcing layer 2 and the reinforcing yarns or reinforcing fibers of the second reinforcing layer 4 are likely to change in the radial direction is negated, and the hose is difficult to twist due to an increase in internal pressure of the hose.
Therefore, there is also an advantage that the shape retention performance can be improved by preventing the hose from twisting.

In the illustrated example, the weaving direction of the reinforcing yarn or reinforcing fiber in the first reinforcing layer 2 and the weaving direction of the reinforcing yarn or reinforcing fiber in the second reinforcing layer 4 are reversed, but the present invention is not limited to this. The weaving directions of the first reinforcing layer 2 and the second reinforcing layer 4 may be the same.
Furthermore, the stitches of the reinforcing yarns or reinforcing fibers in the second reinforcing layer 4 are set to be finer than the stitches of the reinforcing yarns or reinforcing fibers in the first reinforcing layer 2, but the present invention is not limited to this. The stitches of the reinforcing layer 2 and the second reinforcing layer 4 may be the same, or the stitches of the first reinforcing layer 2 may be finer than the stitches of the second reinforcing layer 4.

1 inner layer 1a outer peripheral surface 1b inner surface 2 first reinforcing layer 3 coil 4 second reinforcing layer 5 outer layer 5b outer surface 6 first intermediate layer 7 second intermediate layer T thickness P pitch

Claims (4)

An inner layer formed in a cylindrical shape with a flexible material containing a silicone rubber or a soft synthetic resin as a main component ;
A first reinforcing layer laminated with the reinforcing yarns or reinforcing fibers along the outer peripheral surface of said inner layer is knit freely tubular stretching,
A coil formed by spirally winding a wire along the outside of the first reinforcing layer;
A second reinforcing layer laminated by knit knitting a reinforcing yarn or reinforcing fiber along the outside of the coil into a stretchable cylinder; and
An outer layer which is laminated in a cylindrical shape by the flexible material along the outside of the second reinforcing layer, integrally includes,
In the first reinforcing layer and the second reinforcing layer, a warp knitting row extending in the axial direction of the hose and a weft knitting row extending in the circumferential direction of the hose are knitted in a stretchable manner, A laminated reinforcing hose characterized in that the warp knitting row and the weft knitting row in the second reinforcing layer are made finer than the warp knitting row and the weft knitting row in the reinforcing layer .   The lamination according to claim 1, wherein a first intermediate layer is laminated between the first reinforcing layer and the coil, and a second intermediate layer is laminated between the coil and the second reinforcing layer. Reinforcement hose.   The laminated reinforcing hose according to claim 1 or 2, wherein a ratio of a winding pitch of the coil to a thickness from an inner surface of the inner layer to an outer surface of the outer layer is set to 1.3 to 1.5: 1. Claim 1, characterized in that the braided direction of the warp strings and said weft knitted columns in the first reinforcing layer, a woven direction of the warp strings and said weft knitted columns in the second reinforcement layer in the opposite The laminated reinforcing hose according to 2 or 3.