JP2010054052A - Silicone reinforced hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silicone reinforced hose preventing a braid from falling out. <P>SOLUTION: Along with extension/contraction of an inner layer 1 and an outer layer 2 made of silicone rubber in an axial direction of the hose, a braid 3 knitted to have a tubular shape is extended/contracted in the same direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a silicone reinforced hose excellent in pressure resistance used in, for example, foods, beverages, medical equipment, chemistry and other industries.
Specifically, the present invention relates to a silicone reinforced hose in which a blade is wound between an inner layer and an outer layer whose main component is formed of silicone rubber.

Conventionally, as a silicone reinforced hose of this type, while extruding an inner layer (inner rubber) containing silicone rubber, a braid (reinforcing thread) is knitted on the outer peripheral surface, and an outer layer (outer rubber) containing silicone rubber is further provided. Some of these are integrated by extruding and covering the outer peripheral surface of the blade (see, for example, Patent Document 1).
Furthermore, between the inner layer (intermediate rubber layer) and the outer layer (outer rubber layer) made of silicone rubber, a blade (reinforcing fiber) is wound in a spiral shape to form a layer, and this blade layer (reinforcing fiber layer) There is provided a primer treatment portion treated with a silicone rubber-based primer on the surface of the blade constituting the structure, and the inner layer and the outer layer are firmly bonded by cross-linking adhesion and integrated as a whole (for example, see Patent Document 2). .
In addition, as a connection structure of the reinforcing hose, the connecting fitting is integrally fixed to the connecting end of each hose, the end flanges of the connecting fitting are opposed to each other, and the gasket is sandwiched between them. At the same time, there are some which are brought into close contact with each other through gaskets by tightening clamps that embrace both end flanges (see, for example, Patent Document 3).

JP-A-8-207110 (first page-second page, FIG. 1) JP 2001-12659 A (2nd page, FIG. 1) Utility Model Registration No. 3061574 (4th page, FIG. 4, FIG. 5)

However, in such a conventional silicone reinforced hose, if the inner layer and the outer layer silicone are softened for ease of use, when the tensile force acts in the axial direction of the hose or the internal pressure changes, the entire hose expands. The inner and outer layers expand and contract in the axial direction, but the blade material is significantly lower than the expansion ratio of silicone, and in addition, silicone has higher mold release and lubricity, so the blade is better than other rubbers and constituent resins. Therefore, every time the hose expands and contracts, the blade gradually moves from the axial end of the hose and loses thread, and there is a problem that the pressure resistance performance of this thread-removed portion is significantly reduced.
Furthermore, in the connection structure of the reinforcing hose, the pressure resistance performance of the connecting end arranged at the axial end of the hose is remarkably deteriorated along with the above-described thread removal of the blade. In this case, there is a problem that the hose to be replaced together with the broken hose has to be discarded, and the exchange of the hose is expensive.
Therefore, in order to prevent the blade from coming off the thread, the connection end of the reinforcing hose is inserted into the outer peripheral surface of the nipple and tightened from the outside with a tightening tool to reduce the diameter so that the blade does not move. Can be considered.
However, in this case, when tightened with a tightening tool, the silicone rubber sandwiched between the tightening tool and the nipple is pushed out, and a step is generated between the inner surface of the nipple and the inner surface of the hose, and the inside of the hose is transported. There is a problem that the fluid remains in the generated step or increases the pipe resistance.
Further, as a means for preventing the thread from coming off from the blade, it may be possible to improve the adhesiveness between the inner layer and the outer layer by applying a silicone rubber primer on the surface of the blade, but there is a problem that the cost increases.

The invention according to claim 1 of the present invention aims to prevent the thread from coming off the blade.
In addition to the object of the invention described in claim 1, the invention described in claim 2 is intended to prevent the hose from collapsing due to torsion by increasing the rigidity against torsion of the hose.
In addition to the object of the invention described in claim 1 or 2, the invention described in claim 3 prevents the hose connection end from being cut with a simple structure even if the hose is formed of silicone rubber having excellent flexibility. It is intended to do.

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is characterized in that the blade 3 is knitted into a cylindrical shape and formed into a layer.
According to the second aspect of the present invention, the cross knitting direction of the knit braided blade 3 acts on the two knitting rows 3a and 3b crossing the hose torsion. It is characterized by adding a configuration in which the hose is inclined in a predetermined angle from the axial direction of the hose and wound spirally so as to balance the force.
The invention described in claim 3 is connected to the configuration of the invention described in claim 1 or 2 by covering the outer peripheral surface of the connection end 4 of the hose with the liner 5 and reducing the diameter from the outside by the fastening tool 6. It is characterized by adding a configuration.

According to the invention described in claim 1 of the present invention, as the inner layer 1 and outer layer 2 made of silicone rubber expand and contract in the axial direction of the hose, the braided blade 3 also expands and contracts in the same direction. , It is possible to prevent the blade 3 from coming off.
Therefore, softening the inner layer and outer layer silicone keeps the hose high pressure resistance and prevents rupture compared to conventional ones where the braid is likely to come off, and a silicone rubber primer is applied to the blade surface. Thus, the manufacturing cost can be reduced as compared with the case of improving the adhesiveness between the inner layer and the outer layer.
In particular, knit knitting is a braided braid (reinforcing yarn, reinforcing fiber) that is knitted by changing the direction alternately in the vertical and horizontal directions. it can.

  In addition to the effect of the invention of claim 1, the invention of claim 2 balances the forces acting on the two knitting rows 3a, 3b intersecting when the entire hose is twisted in the circumferential direction, so that the hose is cylindrical. Therefore, the hose can be prevented from being crushed by twisting by increasing the rigidity against the twisting of the hose.

In addition to the effect of the invention described in claim 1 or 2, the invention described in claim 3 reduces the diameter in a state where the liner 5 is sandwiched between the outer peripheral surface of the hose connection end 4 and the fastening tool 6, Since the fastening tool 6 is protected without directly touching the outer peripheral surface of the hose connection end 4, it is possible to prevent the hose connection end 4 from being cut with a simple structure even if the hose is made of silicone rubber having excellent flexibility. .
Therefore, it is more economical than the conventional connection structure in which the connecting fitting is required to be discarded together with the broken hose.

It is a partially cutaway front view of the silicone reinforcement hose which shows one Example of this invention. It is a partially cutaway front view of the silicone reinforcement hose which shows the other Example of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
In this embodiment, as shown in FIG. 1, a silicone reinforcing hose H is integrated by forming a layer by knitting a blade 3 in a cylindrical shape between an inner layer 1 and an outer layer 2, The case where the liner 5 is put on the outer peripheral surface of the connection end 4 of the hose H and the diameter is reduced by the fastening tool 6 from the outside is connected to the nipple portion 7a of the joint 7 is shown.

  The inner layer 1 and the outer layer 2 are molded with silicone rubber whose main component is excellent in flexibility. For example, the inner layer 1 is first extruded by an extrusion molding apparatus as disclosed in JP-A-8-207110. A blade 3 described later is knitted along a peripheral surface of the blade 3 by a knitting machine (not shown), and the outer layer 2 is extruded and laminated outside the blade 3.

  The knitted blade 3 is, for example, a reinforcing yarn or a reinforcing fiber such as polyester, nylon, or aramid fiber. The knitted blade 3 extends in the axial direction of the hose H, and the circumferential direction of the hose H intersects with this. The weft knitting rows 3b extending in the direction are knitted in a stretchable manner.

  The warp knitting rows 3a ... and the weft knitting rows 3b ... are arranged so that the warp knitting rows 3a ... are parallel to the axial direction of the hose H, and the weft knitting rows 3b ... As shown in the figure, a spiral is formed by inclining at a predetermined angle from the axial direction of the hose H so that the forces acting on the warp knitting row 3a ... and the weft knitting row 3b ... are balanced against the twist of the hose H. Wrap.

In the case of the present embodiment, the warp knitting rows 3a are inclined at an appropriate angle with respect to the axial direction of the hose H and knitted in a spiral shape, and the weft knitting rows 3b are substantially orthogonal to the warp knitting rows 3a. Weaving to do.
The crossing angle between the warp knitting rows 3a ... and the weft knitting rows 3b ... may be inclined at an appropriate angle other than the substantially right angle shown in the figure.

  In addition, the liner 5 is safe and heat-resistant for food hygiene such as hard or semi-hard silicone rubber, fluororesin or nylon resin in consideration of using such a silicone reinforced hose H especially for food machinery and medical equipment. It is preferable to use materials having excellent performance. Depending on these materials, a cylindrical shape which is substantially the same as or slightly larger than the outer diameter of the connection end 4 of the hose H, or a double cylindrical shape having a U-shaped cross section. To form.

  In the case of the present embodiment, the liner 5 is formed in a substantially cylindrical shape, and a caulking pipe 6a of a fastening tool 6 described later is covered on the outside of the cylindrical liner 5a, and the caulking pipe 6a is caulked to reduce the diameter. The connecting end portion 4 of the hose H is connected to a nipple portion 7a of a joint 7 described later.

  The caulking pipe 6a of the fastening tool 6 is, for example, stainless steel or aluminum, which is compressed and deformed by pressing in the radial direction by a drive type or manual hydraulic caulking machine (not shown) but is not restored by the repulsive force from the hose H. It is formed in the cylindrical shape which covers the outer peripheral surface of the connection end part 4 of the said hose H with rigid materials, such as.

  In the case of the present embodiment, a covering portion 6b is provided at the base end portion of the caulking pipe 6a so as to protrude inward substantially at right angles along the hose distal end surface 4a, and a screw portion formed on the inner end surface of the covering portion 6b. The fixing means 6c or the like is detachably connected to the axially distal end side of the joint 7 which will be described later, or the caulking pipe 6a and the axially distal end side of the joint 7 are integrated in a double cylinder shape having a U-shaped cross section. By forming, a space S into which the silicone rubber pushed out by reducing the diameter of the connecting end 4 of the hose H with the caulking of the caulking pipe 6a enters into the base end of the caulking pipe 6a.

The joint 7 is made of hard synthetic resin, metal, or the like, and has a bamboo cocoon-shaped nipple portion 7a at the tip end side in the axial direction, and a connecting means 8 for connecting to another machine is provided at the base end side.
In the case of the illustrated example, the inner surface 7b of the tip portion of the nipple portion 7a is inclined so that its thickness dimension gradually becomes thinner toward the tip.

  Further, as the connecting means 8 to the other machine, for example, a flange part 8a as disclosed in Utility Model Registration No. 3061574 is integrally formed, and this flange part 8a and the flange part 8b of the other machine are opposed to each other, A sealing material 8c such as an O-ring is sandwiched between the two, and both the flange portions 8a and 8b are connected and clamped by a clamp 8d so as to be detachably attached.

Next, the operation of such a silicone reinforced hose will be described.
First, the inner layer 1 and the outer layer 2 made of silicone rubber having excellent flexibility are expanded or contracted in the axial direction of the hose H due to the tensile force acting in the axial direction of the hose H or the expansion of the entire hose H as the internal pressure changes. Accordingly, the warp knitting rows 3a ... and the weft knitting rows 3b ... of the blades 3 knitted in a cylindrical shape expand and contract in the same direction.
As a result, the thread 3 can be prevented from coming off.
In particular, knit knitting is a braided braid (reinforcing yarn, reinforcing fiber) that is knitted by changing the direction alternately in the vertical and horizontal directions. it can.

Further, even if the entire hose H is twisted in the circumferential direction, the forces acting on the intersecting warp knitting rows 3a ... and the weft knitting rows 3b ... are balanced to keep the hose H in a cylindrical shape.
As a result, it is possible to increase the rigidity against the twist of the hose H and prevent the hose H from being crushed by the twist.

Further, by reducing the diameter while the liner 5 is sandwiched between the outer peripheral surface of the connection end 4 of the hose H and the fastening tool 6, the fastening tool 6 is protected without directly touching the outer peripheral surface of the hose connection end 4. The
As a result, even if the hose is made of silicone rubber having excellent flexibility, the hose connection end 4 can be prevented from being cut with a simple structure.

  Further, as shown in the drawing, a space S into which the silicone rubber pushed out by reducing the diameter of the connecting end 4 of the hose H by the caulking of the caulking pipe 6a is defined at the base end of the caulking pipe 6a. When the tip inner surface 7b of the nipple portion 7a is inclined, a step is generated between the tip inner surface 7b and the inner surface 4a of the hose connection end 4 even if the caulking pipe 6a is strongly tightened to reduce the diameter. Therefore, it is possible to prevent the residual transport fluid and the pipe resistance from increasing.

On the other hand, what is shown in FIG. 2 is another embodiment of the present invention.
In this, a liner 5 that covers the outer peripheral surface of the connection end 4 of the hose H is formed in a double cylindrical shape having a U-shaped cross section, and the double cylindrical liner 5b is fitted to the hose connection end 4. The configuration is different from the embodiment shown in FIG. 1, and the other configuration is the same as the embodiment shown in FIG.

  Accordingly, the one shown in FIG. 2 can obtain the same effects as those of the embodiment shown in FIG. 1, and the inner peripheral surface of the connection end 4 of the hose H can be replaced with the inner cylinder of the double cylindrical liner 5b. Therefore, there is an advantage that it is difficult to damage the inner peripheral surface of the connection end 4 of the hose H by the bamboo nipple-like nipple portion 7a.

  In the case shown in FIG. 2, the diameter of the liner 5 and the hose connection end 4 is reduced by winding a general hose band 6 d as a fastening tool 6 attached to the outside of the liner 5. However, the present invention is not limited to this, and the caulking pipe 6a may be caulked to reduce the diameter as in the embodiment shown in FIG. 1, and conversely, it is common in the embodiment shown in FIG. A belt-shaped hose band 6d may be used.

  Further, in the case shown in FIG. 2, a cylindrical connecting tube portion 8e is provided as a connecting means 8 to another machine provided on the base end side of the joint 7, and a connecting portion such as a screw is provided on the outer peripheral surface thereof. 8f is formed, but the present invention is not limited to this, and the connecting means 8 to the other machine of the embodiment shown in FIG. 1 may be used. Conversely, the embodiment shown in FIG. The connecting means 8 to the other machine shown in FIG.

DESCRIPTION OF SYMBOLS 1 Inner layer 2 Outer layer 3 Blade 3a, 3b Knitting row 4 Hose connection end 5 Liner 6 Fastening tool

Claims (3)

In a silicone reinforced hose in which a blade (3) is wound between an inner layer (1) and an outer layer (2), the main components of which are formed of silicone rubber,
A silicone reinforced hose characterized in that the blade (3) is knit knitted into a cylinder and formed into a layer.   A predetermined angle from the axial direction of the hose so that the forces acting on the two knitting rows (3a, 3b) intersecting the hose twist are balanced with respect to the crossing knitting direction of the knitted blade (3). The silicone-reinforced hose according to claim 1, wherein the hose is wound in a spiral shape.   The silicone reinforced hose according to claim 1 or 2, wherein a liner (5) is placed on the outer peripheral surface of the connection end (4) of the hose and the diameter is reduced by a fastening tool (6) from the outside.

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