JPH0222558Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention provides a wear-resistant bent pipe with various bending angles for transporting abrasive fluids such as powder and granules by suction or pressure feeding. The present invention relates to a curved pipe hose having a wear-resistant inner layer made of an asymmetric ceramic unit.

[Conventional technology]

Conventionally, hoses related to this have been of a type in which a small piece of ceramic material and a rubber material are combined, and the small piece of ceramic material and the rubber material as a binder are in direct contact with an abrasive fluid.

For example, (a) Japanese Utility Model Application Publication No. 58-142474 discloses a configuration in which granules made of a wear-resistant material are embedded in the inner peripheral surface of the inner tube rubber of a rubber hose reinforced with a reinforcing layer.
In other words, as a claim for registration of a utility model, "a wear-resistant rubber hose characterized in that granular bodies 3 made of a wear-resistant material are embedded in the surface layer of the inner peripheral surface 2" is disclosed.

In addition, (b) JP-A-55-129433 states, as a claim, ``a hard sintered metal with an average particle size of 0.05 to 10 mm and a Mohs hardness of 7 (Knoop hardness 820) or more. Particles of sintered porcelain are dispersed and mixed at a volume ratio of 10 to 60% in rubber having a spring hardness of type A specified in JIS-K6301 Physical Test Methods for Vulcanized Rubber from 20 to 90, and the above particles and rubber are mixed. Bonded abrasion resistant rubber lining material.'' is shown.

In addition, (c) Utility Model Publication No. 60-31574 (name of the invention - Ceramic quill lined rubber hose) states, as the scope of the utility model registration claim, ``A ceramic tile made by fixing a ceramic tile to the inner rubber layer of a rubber hose. In a lined rubber hose, a through hole is provided that penetrates from one side of a thin, approximately rectangular ceramic tile to the other end, a large number of the ceramic tiles are passed through a flexible wire, formed into a band shape, and wound spirally. "A ceramic tile-lined rubber hose, characterized in that the hose is arranged with a ceramic tile lining and is fixed to an inner rubber layer."

That is, the structure is such that the ceramic tiles are connected to each other through a flexible wire with a considerable distance between them, wound around a core, and covered with an inner rubber layer to fix the ceramic tiles. These are connected by flexible wires to prevent individual tiles from falling apart.

As described above, the structure is such that the ceramic material and the rubber material are exposed on the inner surface of the hose.

(Problems to be solved by the invention) As mentioned above, in hose structures, the common drawback of conventional techniques is that both the ceramic material and the rubber material come into contact with the abrasive material. This has problems such as contamination of the fluid due to falling off and abrasion of the rubber material, and shortened durability life due to lack of abrasion resistance.

Regarding the prior art hose described in the above publication,
To summarize the problem, the hose in the publication (a) has a general hose structure, is relatively commonly used, and has a certain degree of abrasion resistance, but during use, There are disadvantages such as shedding of the body and contamination of the worn rubber into the fluid.

The wear-resistant material in the publication (B) has the same problems as those described in the publication (B), but it also has the disadvantage of causing damage to the rubber mixing machine when kneading the ceramic material and the rubber material. be.

The hose in Publication (C) has a configuration in which the ceramic tiles are connected with a flexible wire and fixed to the inner rubber, which prevents individual ceramic tiles from falling off early, but prevents the overall sagging condition. Although the drawbacks that occur still exist, the rubber parts are the spaces between the tiles, and the rubber parts that come into contact with the fluid are relatively small compared to (a) and (b), so it is relatively less of a problem. Although the wear resistance is improved, the ceramic tile is fixed with a wire rod and fixed by being wound spirally, so the flexibility is poor, and if it is used with a small bending radius, it must be manufactured in advance as a specific bend pipe. . Furthermore, the problem of ceramic tiles falling off due to shortened durability due to corrosion and abrasion of the flexible wire remains unsolved.

Therefore, the inventors solved all the above-mentioned conventional problems, namely, the problem of ceramic material falling off,
In addition to solving the problem of fluid contamination by substances other than ceramic materials and the problem of inflexibility due to the use of ceramic materials, in particular, ceramic tile structures not only make it impossible to obtain bent pipes with a small radius of curvature. If a hose with a straight ceramic inner layer is used in a curved shape with a large curvature, as the curvature increases, the ceramic wear-resistant material on the curved inner surface of the hose will take on a complex protruding shape, and the smoothness of the inner surface of the hose will deteriorate. It is necessary to solve the problem of this decrease in smoothness, because not only does the pressure drop of the fluid become large, but also uneven wear due to localized impact wear is promoted.

Therefore, the inventors searched for a bent pipe hose that could solve the above problems.

[Means for solving problems]

This idea is based on an uneven spherical side surface with spherical protrusions and recesses formed on both sides of an asymmetric (different widths at the top and bottom) annular body made of ceramic material (see Figures 1 to 4). A required number of annular asymmetric ceramic units having an annular structure are combined so that the side surfaces and/or inner surfaces of the annular ceramic units are inclined so that the inner surfaces are inclined with respect to the axis of the tubular body,
The wear-resistant inner layer of the hose is formed into a bent tube with an angle of about 30° to 90°, ceramic end rings of the same width are combined at both ends, and the outer periphery is made of a reinforcing layer and an elastomer (highly elastic material such as rubber or rubber-like material). A joint flange is bonded to both ends of this coated hose, and pressure is applied from the outside with a cloth or a mold made of various materials, and the hose is vulcanized and integrated.

Note that it is appropriate that each combined portion on both sides of the ceramic unit be coated with an elastomer so as to be in a non-contact state. For example, the sides of the width of the ceramic unit are free of adhesive and treated to inhibit flow during vulcanization of the elastomer. In addition, the reinforcing layer used is mainly made of textile cords (nylon, polyester, aromatic polyamide fibers, etc.) in order to obtain flexibility, and two-ply intersecting layers are used at an appropriate cord angle depending on the usage conditions. Set in groups.

Note that more details will be described later based on illustrative drawings in the embodiment.

[Effect]

As mentioned above, the required number of annular asymmetric ceramic units (see Figs. 1 to 4) are connected with their mutual side surfaces by uneven spherical surfaces to form a wear-resistant inner layer of the ceramic units in a curved shape on the inner surface of the hose. Because of this, the difference in level between the adjacent parts of the ceramic unit is small, reducing the pressure loss of the fluid, and the deflection angle of the adjacent part can be increased, making it possible to form a bent pipe hose with a small number of units. Ru.

The inner layer of the hose is formed by an assembly of the required number of annular ceramic units made by rubbing together uneven spherical surfaces, so the fluid (powder, powder + air, etc.) comes into contact with the wear resistance of the annular ceramic. Since it is only an inner layer, there is no risk of falling off or contamination, and fluid accumulation is unlikely to occur.

The outer periphery is made of a reinforcing layer and an elastomer to make it airtight, making it resistant to shocks.
The suction effect is maintained.

Since the spherical surfaces of the ceramic units are assembled by rubbing against each other, piping is very easy when installing a bent pipe into equipment because even though it is a bent pipe, it can be freely displaced slightly in the bending direction.

Due to the combination of spherical surfaces, flexibility can be easily obtained even with thick walls, and a wear-resistant inner layer of considerable thickness can be obtained.

〔Example〕

FIG. 1-a shows the formation of the wear-resistant inner layer of the bent pipe hose of this invention. This is a front view of a straight annular asymmetric ceramic unit with a straight inner surface. Fig. 1-b is a side view of the same, in which the widths of the upper and lower parts of the annular body are changed and the width of the lower part is reduced, and the side part The inner and outer surfaces are straight with an inclination of about 3 degrees. Therefore, by combining the sides of this unit, a bent pipe is obtained.

In the figure, 1 is a straight annular asymmetric ceramic unit, 1a is a spherical protrusion, 1
b is a spherical recess, 1c is the width of the upper part, 1d is the width of the lower part, and 1e is the inclined surface, and various curved pipe hoses can be obtained depending on the degree of inclination.

FIG. 2-a is a front view of a tapered annular asymmetric ceramic unit 2 with an inclined inner surface.
Fig. 2-b is a side view of the same unit, and this example has a smaller width at the bottom than the unit shown in Fig. 1, that is, the slope of the side is increased to approximately 5 degrees, and the unit is circular. It is a tapered type with slopes on the outer and inner surfaces of the periphery.

In the figure, 2a is a spherical protrusion, 2b is a spherical recess, 2c is the width of the upper part, 2d is the width of the lower part, 2
e is an inclined plane.

FIG. 3 shows the straight annular body shown in FIG. 1 with its inner diameter eccentric. That is, Fig. 3-a
3 is a front view of the straight eccentric annular asymmetric ceramic unit 3 , and FIG. 3-b is a side view of the same.

In the figure, 3a is a spherical protrusion, 3b is a spherical recess, 3c is the width of the upper part, 3d is the width of the lower part, 3
e is an inclined plane.

FIG. 4 shows the tapered annular body shown in FIG. 2 with its inner diameter eccentric. That is, Fig. 4-a
4 is a front view of a tapered eccentric annular asymmetric ceramic unit 4 , and FIG. 4-b is a side view of the same.

In the figure, 4a is a spherical protrusion, 4b is a spherical recess, 4c is the width of the upper part, 4d is the width of the lower part, 4
e is an inclined plane.

The wear-resistant inner layer of the curved pipe hose is formed by combining the spherical side surfaces of the various annular asymmetric ceramic units described above and combining them in the required number.

In addition, when comparing the straight system shown in FIG. 1 with the tapered system shown in FIG. 2, a larger bent pipe can be obtained with the tapered system at the same degree of inclination. This bent pipe is
Curved parts, where the impact of the fluid is large, are subject to severe wear, and uneven wear is more likely to occur than straight pipes.

Therefore, in FIG. 3, the center of the annular inner diameter of the straight asymmetric ceramic unit shown in FIG. In this example, the center of the annular inner diameter of the tapered asymmetric ceramic unit shown in Fig. 2 is shifted, and the thickness of the outwardly curved portion is gradually increased from the inner curved portion to the outward direction. This is intended to achieve a balance in wear and increase durability.

Figure 5 shows the wear-resistant inner layer of the annular asymmetric ceramic unit of this invention in a state of union.
This figure shows an example of the shape of ARIL ( 1 , 2 , 3 , 4 ), with the outer layers (inner coating layer, reinforcing layer, outer coating layer) removed except near the joint flange.

In the figure, ARIL is a wear-resistant inner layer consisting of various annular asymmetric ceramic units, 5 is a ceramic end unit provided at both ends of the hose,
6 is an elastomer inner covering layer that wraps around the wear-resistant inner layer ARIL, 7 is a reinforcing layer (2 plies of textile cord), 8 is an elastomer outer covering layer, 9 is a joint flange, 9a is a notch inside the joint flange, 9b
10 is a bolt hole, 10 is a fixing ring, and 11 is an elastomer seal portion on the outer surface of the joint flange 9 .

To assemble this curved hose, for example, the required number of annular asymmetrical ceramic units are placed on a core mold in which low-pressure fluid is introduced into a thin-walled hollow curved tube having an elastomer fiber-reinforced layer. The asymmetric ceramic unit and the ceramic end ring 5 are inserted between the asymmetric ceramic unit and the ceramic end ring 5. Similar to , they are combined on a concave and convex spherical surface. The outer periphery thereof is wrapped with an elastomer inner covering layer 6, and further, a reinforcing layer (2 plies of textile cord) 7 topped with elastomer is wound thereon, and covered with an elastomer outer covering layer 8. A joint flange 9 is inserted into both ends of the joint flange 9 , and a fixing ring 10 for folding and fixing the end of the reinforcing layer is brought into contact with the notch 9a of the joint flange 9, and an elastomer seal is attached to the outer flange surface. The portion 11 is formed and integrated by vulcanization.

[Effect of idea]

This invention forms a wear-resistant inner layer on the inner surface of the hose by rubbing together the spherical surfaces of the annular asymmetric ceramic unit, resulting in a smooth curved tube, smooth flow of fluid, and durability in the curved tube. be effective. In addition, it has the functions described in the previous section, and a bent pipe with durability and a small radius of curvature, which cannot be obtained with conventional hoses of this type, can be obtained. Also, unlike fixed curved pipes, it has a certain degree of freedom even though it is a curved pipe, so
Excellent piping ease effect can be obtained. In addition, since it is a thick rubbed structure, and furthermore, wear resistance due to eccentricity is obtained, the effect of extending the durable life for a long period of time is obtained.

[Brief explanation of the drawing]

Fig. 1-a is a front view of a straight annular asymmetric ceramic unit, Fig. 1-b is a side view of the same, and Fig. 2-a is a front view of a tapered annular asymmetric ceramic unit. , Figure 2-b
is the same side view, FIG. 3-a is a front view of a straight eccentric annular asymmetric ceramic unit, FIG. 3-b is the same side view, and FIG. 4-a is a tapered eccentric type. FIG. 4B is a front view of the annular asymmetric ceramic unit, FIG. 4B is a side view of the same, and FIG. 5 is a diagram showing the shape of the wear-resistant inner layer showing an example of the interior of the curved pipe hose of this invention. 1 , 2 , 3 , 4 ... Annular asymmetric ceramic unit, 1a, 2a, 3a, 4a... Spherical protrusion, 1b, 2b, 3b, 4b... Spherical recess, 5... Ceramic end Part ring, 6... Elastomer inner coating layer, 7... Reinforcement layer, 8... Elastomer outer coating layer, 9 ... Joint flange, ARIL...
Wear-resistant inner layer (association of each of 1 , 2 , 3 , 4 , etc.).

Claims (1)

[Claims for Utility Model Registration] (1) As the inner layer of the hose, an annular asymmetric ceramic unit whose inner surface is inclined with respect to the axis is formed by fitting a spherical protrusion and a recess. combining the required number of shapes to form a bent pipe state of the wear-resistant inner layer of the ceramic unit;
A wear-resistant inner layer consisting of an asymmetrical ceramic unit in which a ceramic end ring is abutted on both ends of the hose, its outer circumference is covered with a reinforcing layer and an elastomer, and joint flanges are bonded to both ends of the coated hose and integrated by vulcanization. Bent pipe hose with. (2) A bent pipe hose having a wear-resistant inner layer made of an asymmetric ceramic unit according to claim 1, wherein the annular asymmetric ceramic unit is a straight annular asymmetric ceramic unit. (3) A bent pipe hose having a wear-resistant inner layer made of an asymmetric ceramic unit according to claim 1, wherein the annular asymmetric ceramic unit is a tapered annular asymmetric ceramic unit. (4) A bent pipe hose having a wear-resistant inner layer made of an asymmetric ceramic unit according to claim 1, wherein the annular asymmetric ceramic unit is a straight eccentric annular asymmetric ceramic unit. (5) A bent pipe hose having a wear-resistant inner layer made of an asymmetric ceramic unit according to claim 1, wherein the annular asymmetric ceramic unit is a tapered eccentric annular asymmetric ceramic unit.