JPH08159349A - Deformed rubber piping joint and manufacture thereof - Google Patents

Abstract

PURPOSE: To shorten piping connected to the delivery side of a hot and cold water feed pump used for air-conditioning of a building, and allow the piping to be easily laid. CONSTITUTION: In order to enable a single deformed rubber piping fitting 10 to function representing both of a metallic deformed pipe and a rubber piping joint of the same diameter connected thereto, an even number of sector form sheets of rubber covered fabric cord 2 are kept crossing each other in opposite directions and pasted to the surface of the inner rubber layer 3 of the fitting as an unvulcanized rubber covered fabric cords. In this case, width for pasting the cord 2 is gradually reduced in such a state as identical to the length of a large diameter periphery at a large diameter section and identical to the length of a small periphery at a small diameter section. Thereafter, the sheets are vulcanized. In addition, the reinforcing angle of the fabric cord 2 is identical at all sections for the axial line of the fitting.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] The present invention relates to a rubber pipe joint which is mounted on the outlet side of a hot and cold water supply pump used for cooling and heating a building and absorbs displacement due to vibration of the pump and installation error due to construction.

[0002]

2. Description of the Related Art Generally, a water feed pump has a large flow velocity on the outlet side and reduces the economical flow velocity of the pipe. Therefore, a different diameter pipe (reducer) made of cast iron or steel is attached right above the outlet of the pump (FIG. 3). Most of the different diameter pipes made of metal have a size difference (for example, 150 mm on one side and 200 mm on the other side), have a smooth change in inner diameter so that fluid can flow smoothly and pressure loss can be reduced. Is provided. The small-diameter side flange is fastened to the pump outlet, and the large-diameter side flange is used by being connected to the subsequent pipe via a rubber pipe joint having the same diameter.

[0003]

[Problems to be Solved by the Invention]

1) Generally, the discharge side of the pump is in a vertical state, and the pipe of different diameter, the rubber pipe joint of the same diameter, the check valve (and valve), and the pipe are connected in this order from the pump outlet, but the limited piping space (height It is very difficult to arrange and assemble all of these parts in (), and it becomes difficult to operate and maintain the valve. Therefore, the first problem is to reduce the mounting space for the piping parts. 2) Many of these pipe parts are generally flange-connected, but there are manufacturing tolerances in each part, and assembly errors occur during mounting. In addition, thermal expansion and contraction of the piping occurs due to changes in fluid temperature and outside air temperature. Since the pump is supported by a vibration isolator so that its rotational vibration is not transmitted to the floor surface, shaking also occurs between the pump and the pipe. Rubber pipe joints are used to absorb all of these manufacturing tolerances, assembly errors, thermal expansion and contraction, and pump vibrations, but it is not possible to use long pipes in a limited space, so various types of large It is difficult to absorb the bending.

[0004]

Means for Solving the Problems As a result of intensive research to solve the above problems, the present invention has been achieved, that is, in view of these problems, the different diameter pipe is a rigid body, and the flexible joint It has been devised to solve both of these by making the same-diameter rubber pipe joint that is a different-diameter rubber pipe joint such as a different-diameter pipe. That is, in a rubber pipe joint for absorbing pipe displacement that is attached to the outlet side of a water supply pump, a rubber pipe joint of different diameter with a small diameter on the fluid inlet side and a large diameter on the discharge side As for the first problem, since the installation height is reduced by the amount of the conventional different diameter pipe, piping and piping parts can be easily installed, and frequent valve operations and maintenance work are required. Will be able to do it at a lower position. In addition, in order to maintain the strength and shape-corresponding force of the different diameter rubber pipe joint, laminated molding in which unvulcanized rubber sheets and reinforcing fiber layers of Sudare woven covering unvulcanized rubber are alternately laminated in one direction. In a rubber pipe joint of different diameter obtained by vulcanizing a material, in a rubber pipe joint of different diameter in which the direction of the fibers of the sloping reinforcing layer is arranged at the same angle in all parts with respect to the axis of the rubber pipe joint of different diameter. In addition, the arcuate portions corresponding to the outer edge and the inner edge of the fan are formed into a fan-shaped reinforcing surface having a scalloped reinforcing layer covered with unvulcanized rubber, and the sticking width of the scalloped reinforcing layer is a circle with a large diameter. The circumference is large and the circumference of a small diameter is small, and the sloping density is continuously expanded from the inner arc to the outer arc of the fan to provide a constant reinforcement to the axis of the different diameter rubber tubular body. Reinforcing fibers in which the directions of the fiber layers are arranged in a spiral shape so as to form an angle Is a different-diameter rubber pipe joint in which the fan-shaped reinforcing fiber Suda record is attached to different-diameter pipes by alternately laying the even-numbered sheets with different slack directions alternately according to the angular direction, and the reinforcing angle of the fiber layer is constant, That is the manufacturing method.

A rubber pipe joint is generally formed by fixing a rubber tubular body reinforced with a fiber layer at both ends with a flange or holding it loosely, and connecting it in the middle of the pipe to hold a fluid while expanding and contracting the pipe line, eccentricity and In order to allow displacement such as twisting, this reinforcing fiber layer is 30 to 70 relative to the axis of the rubber tubular body.
It is formed by alternately arranging the fold-like fiber layers at an inclination angle of °. Since a normal rubber pipe joint or a rubber hose has the same diameter at both ends, it is possible to use a parallelogram shape having a constant width as the sloppy fiber layer. Therefore, in the fiber layer after the bonding arrangement, the preset angle with respect to the axis of the rubber tubular body is constant at each site.

On the other hand, in the different diameter rubber pipe joint of the present invention, since the diameters are different at both ends, it is not possible to attach parallelogrammic fiber layers having a constant width. In order to solve this problem, the sloping fiber layer is formed into a fan shape, and the arc portions corresponding to the outer edge and the inner edge of the fan are the circumferences of the large diameter side and the small diameter side of the different diameter rubber pipe joint, respectively. The length is made equal, and the slack density is continuously expanded from this inner arc to the outer arc, and when this is pasted, it is preset so as to form a constant reinforcing angle with respect to the axis of the different-diameter rubber tubular body. A reinforcing fiber layer in which the directions of the fiber layers were arranged in a spiral shape was prepared, and the reinforcing fiber layers were alternately attached according to the angle direction, whereby the reinforcing angle of the fiber layer could be made constant.

As a result, when the pressure of the fluid acts, the different diameter rubber pipe joint does not undergo local deformation, and even if expansion, eccentricity, or twisting is applied, the different diameter rubber pipe joint as a whole. Since the displacement can be absorbed by, it is possible to provide a different diameter rubber pipe joint that allows a large bending displacement. or,
The diameter gradually changes from the small diameter side to the large diameter side, there is no pressure loss as a different diameter pipe, the conventional rigid different diameter pipe is unnecessary, and the mounting space is reduced as a whole and the assembly error is reduced. Since the mounting height is also low, valve operation and maintenance inspection of piping can be done easily by this amount.

[0008]

[Function] By replacing the conventional metal different diameter pipe / same diameter rubber pipe joint with two functions of different diameter rubber pipe joint, the assembling height is reduced by the amount of the conventional different diameter pipe. Also, the mounting work of the piping parts becomes easy, and the frequent valve operation and its maintenance work can be performed at a low position. By using the different diameter pipe itself as a different diameter rubber pipe joint, there is more space in the installation space, and freedom in designing different diameter rubber pipe joints that absorb various displacements that occur between the pump and the pipes connected to it. The degree of bending is large, allowing a large bending displacement, and at the same time exerting the function of a different diameter pipe.

The present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view of a conventional same-diameter rubber pipe joint 7, and FIG. 3 shows a piping method from a pump, in which a cast iron or iron different-diameter pipe (reducer) 8 and a pipe line are provided at a discharge port of the pump. Telescopic, eccentric,
A rubber pipe joint 7 having the same diameter, which is a flexible pipe joint that absorbs twisting and bending displacement, is connected to the pipes in the order of the check valve 6.
On the other hand, FIG. 1 is a cross-sectional view of one side of the different diameter rubber pipe joint 10 of the present invention, and FIG. 4 is an explanatory view showing the piping configuration of the different diameter rubber pipe joint 10 of the present invention. The different-diameter rubber pipe joint 10 having the function of the different-diameter pipe is arranged at the position, and plays the role of absorption of the bending displacement and pump pipe as the different-diameter pipe. In the present invention, the metal different diameter pipe 8 and the same diameter rubber pipe joint 7 of FIG. 3 are combined and integrally molded into the different diameter rubber pipe joint 10 of the present invention of FIG. The number of is reduced from 3 to 2, the space in the height direction is reduced, and the position of the check valve (or valve) 6 is also lowered.

FIGS. 5 and 6 are for explaining the pasting shape of the SUDAR record 11 of the conventional same diameter rubber pipe joint 7 in order to facilitate understanding of the pasting angle of the fiber layer of the different diameter pipe of the present invention. In a schematic view, in this case, if a parallelogram-shaped fold-like fiber layer having a constant width is attached to the axis of a rubber tubular body having the same diameter and a constant reinforcing angle is applied, the axis of the axis is changed as shown in FIGS. 7 and 8. It shows that the same reinforcement angle can be obtained at any position in the direction. That is, the SUDAR record 11 coated with unvulcanized rubber is used as a rubber-coated SUDAR record of the first ply (3 ply, 5 ply) of the reinforcing cord having the shape shown in FIG.
2 ply (4 ply, 6 ply) of reinforcing cord in the shape of
As the rubber-coated Suda record, rubber-coated Suda records are attached so that the Suda records 13 are alternately vulcanized at about 70 degrees, and vulcanized to form the reinforcing cord 2.

FIGS. 9 and 10 show a different diameter rubber covered sudar record 12 bonded to the different diameter rubber pipe joint 10 of the present invention.
9 is a schematic view for explaining the shape of the different diameter rubber pipe joint, since the diameter of the small diameter on the inlet side is D ₂ and the diameter of the large diameter on the discharge side is different from D ₃ , the sloppy fiber layer 2 is shown in FIG. And FIG.
As shown in Fig. 4, the arc-shaped portions corresponding to the outer edge and the inner edge of the fan are πD ₃ for the large-diameter pasted portion of the different-diameter tube rubber-coated Suda record 12, and πD for the small-diameter pasted portion. large diameter D ₃ of different diameter rubber pipe joint as indicated by _2,
The diameter is made equal to the circumference of the small diameter D ₂ , and the slack density is continuously expanded from the inner arc (ab) to the outer arc (cd). To form a constant reinforcing angle α, prepare a fiber reinforcing layer in which the tangent angle at each position is changed from β ₀ to β so as to form a preset spiral shape, and the direction of the fiber layer is arranged. By alternately laminating even plies in different directions, it is possible to make a different diameter rubber pipe joint with a constant reinforcing angle of the fiber layer.

FIGS. 11 and 13 show the shape of the reinforcing cord shown in FIG. 1 simply as in FIGS. 9 and 10, and the reinforcing cord layer has a small diameter to a large diameter as shown in FIG. It has a smoothly curved cross-section. This is a state where fluid pressure is applied to the different diameter rubber pipe joint, expansion and contraction,
The shape is selected so that it can be easily deformed due to eccentricity and torsion. Therefore, the cross-sectional shape is curved and changed from the small diameter to the large diameter. Therefore, the planar shape of the reinforcing cord is the fan shape e.f.g.h of FIGS. 11 and 13, but since it is curved, there is a bulge s as shown in the AA cross section of FIG. However, it is difficult to prepare such a three-dimensional reinforcing cord layer,
Since this also causes a cost increase, according to the present invention, the reinforcing cord layer is attached in a shape that can be prepared in a planar shape as shown in FIGS. 9 and 10, and a pressure is applied from the inside during vulcanization to obtain a cross section of the reinforcing cord layer. However, it is inflated to have a curved shape.
Therefore, the reinforcing angle αn of the reinforcing cord layer of FIGS. 1, 11 and 13 with respect to the axis of the different diameter rubber flex is not exactly constant at each position, but it is constant in the shapes of FIGS. 9 and 10. 11 and FIG.
The shape may cause the reinforcing angle to be slightly deviated due to the effect of the shape of the curve, but this is a range that causes no practical problem.

[0013]

EXAMPLES Examples will be described with reference to FIG. 1. First, reinforcing cords (fibers) of even-numbered plies are alternately applied around the inner rubber layer 3 by the method of the present invention. , Turn up and fix to the solid ring (solid ring) 4 at both large and small ends, and stick the outer layer rubber (cover rubber) 1 on it, and the small diameter flange 150 mm of the metal different diameter pipe prepared in advance at that position. The inner diameter and the large diameter of 200 mm are fixed or loosely arranged to have a total length of 200 mm. (See FIG. 1) On the other hand, the different diameter pipe type rubber pipe joint of the present invention is mounted as shown in FIG. 4, and the rubber pipe joint has a small diameter side inner diameter of 150 mm and a large diameter side inner diameter of 200 mm of the same size as the metal different diameter pipe. The performance comparison of the rubber pipe joint is shown in FIG.

As described above, when the different diameter rubber pipe joint of the present invention is used, the allowable displacement amount can be as large as 25 to 40%, and a uniform shape can be maintained and attached even when pressure is applied. The height is also reduced and the operability is improved.

The rubber used is EPDM for both the inner and outer rubber layers.
(Ethylene propylene diene rubber) was used, but other rubbers may be used, and the thickness of the rubber is 4 mm (2 to 1
0 mm) and the outer layer 3 mm (1 to 8 mm). The reinforcing fiber was made of polyester cord 1260d / 3 strands. In addition to this for the reinforcement cord, nylon 6 and nylon 66,
Rayon etc. can also be used, and regarding fiber thickness and density,
It can be selected according to the size and strength of the rubber pipe joint. As described above, the reinforcing fiber layers were alternately laminated in two layers so that α in FIGS. 9 and 10 became a constant angle of 55 ° with respect to the axial direction. Of course, regarding the reinforcement angle,
It can be set so that a predetermined performance can be obtained according to changes in the diameter, length and bulge of the tube.

[0016]

【The invention's effect】

1) In the outlet piping of pumps that require pipes of different diameters, the number of mounting points for piping parts is reduced, which reduces the purchase price of parts, lowers installation labor costs, reduces installation labor costs, and reduces installation height. Therefore, the equipment space becomes smaller. Also, the valve is generally installed above the check valve and is frequently operated and inspected on a daily basis, but the working height is low, so work safety can be achieved. 2) Since a rubber pipe with a different diameter can be attached at the position closest to the pump which is the vibration source, the effect is great in absorbing the vibration of the pump. 3) When the different diameter pipe type rubber pipe joint of the present invention is used, the allowable displacement amount can be as large as 25% to 40%, and it is possible to maintain a uniform shape even when pressurized. became.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a different diameter rubber pipe joint of the present invention.

FIG. 2 is a cross-sectional view of a conventional same diameter rubber pipe joint.

FIG. 3 is a schematic piping diagram of a pump using a conventional same diameter rubber pipe joint and a different diameter pipe.

FIG. 4 is a schematic piping diagram of a pump using the different diameter rubber piping joint of the present invention.

FIG. 5 is an explanatory view showing a pasted shape of a conventional same-diameter rubber pipe joint and a same-diameter pipe rubber-coated sudar record.

FIG. 6 is an explanatory view showing a shape in which a conventional same-diameter rubber pipe joint and a same-diameter pipe rubber-coated sudar record are attached from opposite directions.

FIG. 7 is a diagram showing that the reinforcing angle of the attached sloping fiber layer in FIG. 5 is constant in each part of the diameter of the rubber pipe having the same diameter.

FIG. 8 is a view showing that the reinforcing angle of the stuck-on fibrous layer attached in FIG. 6 is constant in each part of the diameter of the rubber pipe having the same diameter.

FIG. 9 is a schematic view showing a shape for preparing a sloppy fiber layer having a different diameter rubber pipe diameter of the present invention.

FIG. 10 is a schematic view showing a shape for preparing a sloppy fiber layer to be stuck from the opposite direction of FIG. 9 of the present invention.

FIG. 11 is a schematic view of an embodiment of the present invention,
The figure which shows the three-dimensional shape of a fold-like fiber layer.

12 is a cross-sectional view taken along the line AA of FIG.

FIG. 13 is a diagram showing a three-dimensional shape of a sloppy fiber layer attached from the opposite direction of FIG. 11.

FIG. 14 is a performance comparison table of rubber pipe joints.

[Explanation of symbols]

1 Outer layer rubber (cover rubber) 2 Reinforcement cord (sudder-like fiber layer) 3 Inner layer rubber 4 Solid ring (solid ring) 5 Flange 6 Check valve 7 Same diameter rubber pipe joint (flexible) 8 Different diameter pipe (reducer) 9 Pump 10 Different-diameter pipe rubber piping joint (flexible) 11 Same-diameter pipe rubber-coated Suda record (conventional) 12 Different-diameter pipe rubber-coated Suda record (present invention) 13 Suda record D ₁ Same-diameter pipe diameter D ₂ Different-diameter pipe diameter ( Small) D ₃ Different diameter pipe diameter (large) d Attachment angle h Slit width πD ₁ Same diameter pipe circumference πD ₂ Different diameter pipe circumference (small) πD ₃ Different diameter pipe circumference (large)

[Table 1]

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[Procedure amendment]

[Submission date] April 12, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

EXAMPLES Examples will be described with reference to FIG. 1. First, reinforcing cords (fibers) of even-numbered plies are alternately applied around the inner rubber layer 3 by the method of the present invention. , Turn up and fix to the solid ring (solid ring) 4 at both large and small ends, and stick the outer layer rubber (cover rubber) 1 on it, and the small diameter flange 150 mm of the metal different diameter pipe prepared in advance at that position. Internal diameter, large diameter 200mm, fixed or loosely arranged, total length 200
mm. (See FIG. 1) On the other hand, the rubber pipe joint of the different diameter pipe type of the present invention is mounted as shown in FIG. 4, and the rubber pipe joint has a small diameter side inner diameter of 150 mm and a large diameter side inner diameter of 200 mm of the same size as the metal different diameter pipe. The performance comparison of the rubber pipe joints is shown in Table 1.

[Table 1]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 14

[Correction method] Delete

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Claims (3)

[Claims] 1. A rubber pipe joint for absorbing pipe displacement, which is attached to the outlet side of a water supply pump, wherein the inlet side of the fluid has a small diameter and the discharge side has a large diameter. 2. A different-diameter rubber pipe joint obtained by vulcanizing a laminated molded product, wherein an unvulcanized rubber sheet and a reinforcing fiber layer of a woven fabric which is coated with unvulcanized rubber are alternately laminated in each direction. 2. The different diameter rubber pipe joint according to claim 1, wherein the directions of the fibers of the sloping reinforcing layer are arranged at the same angle with respect to the axis line of the different diameter rubber pipe joint. 3. In a different diameter rubber pipe joint having a small diameter on the fluid inlet side and a large diameter on the discharge side, a scalloped reinforcing layer coated with unvulcanized rubber is formed into a fan shape to form an outer edge of the fan. The arc-shaped portions corresponding to the inner edge and the inner edge are large in the sticking width of the scalloped reinforcing layer to the circumference of a large diameter and small to the circumference of a small diameter, and a fan-shaped inner arc. To the outer arc, the sag density is continuously expanded and the reinforcing fiber layers are arranged in a spiral shape so that the reinforcing fiber layers are arranged in a spiral shape so that a constant reinforcing angle is formed with respect to the axis of the different diameter rubber tubular body. 3. The fan-shaped reinforcing fiber sudarecord is attached to a different diameter tube by alternately arranging the slackening directions alternately and vulcanized so that the reinforcing angle of the fiber layer is made constant. A method for manufacturing the different diameter rubber pipe joint described.