JPS60139989A - Expansion pipe joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

This article relates to expansion pipe joints that are used as means for connecting pipes to each other or for connecting pipes to be cut into equipment, and can absorb vibrations caused by expansion and contraction of pipes due to temperature changes or earthquakes, thereby preventing damage to pipes. (/'I. Three types of such expansion/contraction pipe joints 0' + structural examples are shown in FIGS. 2 to 4. However, FIGS. It is an enlarged cross-sectional view of the main part of the pipe joint OIN, taken along the line A-A.In the figure, members made of the same material are marked with 101 numerals.In the example of Fig. 2, the rubber layer 03 and the reinforcement A main body part B is formed in a laminate consisting of layers (for example, made by Hiniron) 04,
The laminate covers the outer surface (the surface connected to the pipe) of the metal annular flange plate o2 in an expanded shape and joins it n'
The main body TIAB has multiple metal reinforcing rings that provide pressure resistance and rigidity.
5 is built-in. In the third [ii17+ example, the main body BvC, reinforcing ring o5 and multiple reinforcing band 06 are built-in,
A laminate consisting of the rubber layer o3 and the reinforcing layer 04 is VC-bonded to the outer surface of the annular flange plate o2. Below, in the example shown in FIG. 4, the main body BVc reinforcing ring 05 and multiple reinforcing bands 06 are built in, the reinforcing ring 05 is fitted into the inner circumference of the annular flange plate 02, and both reinforcing rings 1] 0
In the examples of FIGS. 2 and 3, the reinforcing layer 04 is expanded below the outer surface of the annular flange plate 02, and in the example of No. 41A, the reinforcing layer 04 is wound around the reinforcing ring 05. When a tensile force is applied to the expansion pipe joint o' trIc, the main body part B
This prevents the annular flange plate 02 from separating. Expansion pipe joints with such a structure have the following disadvantages: ■The reinforcing layer 04 is formed into a cylindrical shape, a flange shape at both ends, or a reinforcing ring.
It is surprisingly difficult to manufacture the expansion pipe joint 1 by winding the reinforcing layer 04 around the pipe 5, and the work efficiency is poor. ■Due to its structure, it is difficult to ensure the dimensions of the main body part B are accurate, and manufacturing tolerances become large. ■When compressive force is applied to the expansion pipe joint, the part where the reinforcing ring 05 is located other than the central main body, which has good flexibility σ), also deforms, but the part θ) has a large elastic modulus. The reaction force caused by the reciprocating direction is the connected tube rLτ,
Or it may affect the main body of the device, which is not good. ■Since the connecting part between the annular flange plate 02 and the main body B does not have a rigid structure, it is easy for the annular flange 1027+ to undergo deformation such as radial direction and warping from its inner periphery. In the example shown in FIGS. 2 and 3 σ), the reinforcing layer 04 is disposed below the outer surface of the annular flange plate 02. : Due to the machining, the thickness of the mouth including the rubber layer 03F becomes larger, resulting in an m-shaped hole.
When tightening the joint plate O2 and the flange of the connecting part pipe with the bolts, stress or looseness may occur over time, causing liquid leakage.
In order to prevent L and N, it is necessary to retighten them one after another. Non-inventiveness does not mean that inventions were created under such technical background.
The objective is to provide an expansion pipe joint that is easy to manufacture and has good durability. The cylindrical body made of a flexible material is bonded to cover the inner and outer surfaces of both nipples and the outer surface of the annular flange plate, and the central main body is The cylindrical body made of a flexible material, which is shaped to bulge outward, has a cylindrical reinforcing layer built therein extending from both nipple portions to the central main body portion, and
A cylindrical reinforcing layer located on the outer periphery of both nipples surrounds the nipple and is characterized in that the layer has a built-in awning for preventing the nipple from being pulled out. □ In this way, one uninvented expansion pipe joint is made of a strong flexible material and is reprinted, making it difficult for the annular flange plate to form a ridge. 111″k, outer surface of the annular flange plate: Since the seaweed is covered only with the flexible material that is the matrix, and there is no reinforcing layer, the wall thickness of the covering part is thin, and the stress relaxation after tightening is low. Furthermore, when compression is applied to an expansion pipe joint, the part where the nipple is located will not deform, but only the bulging central main body will deform. does not generate any reaction force that may adversely affect the main body of the device.Furthermore, a cylindrical reinforcing layer located on the outer periphery of the nipple part is surrounded by a tightening layer to prevent it from being pulled out.

[Because of this, even if a large tensile force is applied to the expansion joint, the nipple will not separate from the main body. The cylindrical reinforcing layer extends only from position 1 to the outer surface of the annular flange plate only on the main body, and the metal W
Since it does not use IJ gun, it is easy to manufacture expansion pipe joints and improves work efficiency. Hereinafter, an embodiment of the present invention will be explained in accordance with FIGS. 5 to 8. Figure 5 shows the expansion pipe joint [7111 side view]
Figure 6 is a view taken along the Vl-Vl line, and Figure 7 is a view of the
It is an enlarged sectional view taken along ■-■ in the figure. 1. The expansion pipe joint 1 has a main body section 2 having a generally annular shape as a whole, and a flange section 5 attached to one end of the main body section 2. The main body part 2 is made of a rubber cylindrical body 3, and its central part 4 is shaped to bulge outward. ■k, The hood part 5 has a steel annular flange plate 7 as the main part, and its outer surface is the rubber cylindrical body 3 in the main body part.
It is covered with a covering layer 6 integral with the. Therefore, the annular flange plate 7 has one tube on its inner circumference.
The steel nipple part 8 is integrally formed (one piece molded, and the part is welded) @Emata, and the nipple part 8 extends toward the center of the main body part 2σ), and has a protrusion 9w ( fN.Furthermore, the outer circular surface of the first part 80 is covered with a rubber cylindrical body 3. A cylindrical reinforcing layer 10 and a tightening layer 11 to prevent removal are built into the rubber cylindrical body 3. The cylindrical reinforcing layer 10 is made of polyester resin and has a nitrogen part 8.
peripheral force) et al., center F! The portion located on the outer periphery of the nipple portion 8θ) is narrowed to a diameter smaller than that of the protruding strip 9. Then, on the outer periphery of the part 10αθ) under the aperture, a fiber band with good heat shrinkage (e.g., 1-imine-made or woven band) is used to prevent winding and pull-out. The tightening of the layer 1 is IVC, which is δ.The expansion pipe joint I having such a structure can also be obtained by heating and vulcanizing the rubber layer using a mold, but θ) Prior to molding, a fiber band with good heat shrinkability (tightening can be done by wrapping the layer 113 around the outer periphery of the narrowed part 1.0α) 〇) The fiber band shrinks due to subsequent heating and is strongly tightened against the nipple portion 8 of the cylindrical reinforcing layer 10. In this way, in the expansion pipe joint 1 of the non-embodiment, the cylindrical reinforcing layer 10
χ Nitsupuru! It is not necessary to extend it to the outer surface of the annular flange plate 7 by simply placing it on the outer periphery of the annular flange plate 7. Since there is no need to use metal reinforcement,
Its manufacture is easy and the productivity is the same as above. Since the cylindrical reinforcing layer 10χ is not disposed on the outer surface of the annular flange plate 70, the covering layer 6 is formed as a thin rubber layer, for example, as shown in FIG. Pipe side, 3
In this case, the stress relaxation of the coating layer 6 (1) is small, and the number of maintenance and inspection operations to prevent liquid part n'lf is reduced. In addition, the metal nipple part 8 is located in the main body part 2, and the space between the double-topped 7 runci plates 70) can be finished more accurately than conventional ones, making it easier to manufacture. Tolerances become smaller. Furthermore, the annular flange temporary 7, main body 2 and θ) floating part are
Since it is reinforced and reprinted by the nipple portion 8, deformation of the annular flange plate 7 due to external force is difficult to occur, and durability is good. Moreover, the nipple part is cracked. The cylindrical reinforcing layer 10σ) is narrowed down to a diameter smaller than that of the protrusion 9, and the layer 111C securely fixes it to the outer periphery of the nipple part 8 (/I). Therefore, even if a large tensile force acts on the expansion joint ZC, the rubber cylindrical body 3 and the nipple part 8 will not separate.Furthermore, a force in the compression direction θ) is applied to the expansion joint '+1. In the case of a bulging shape σJJ center part 40 where the nipple part 8 does not exist
7 is deformed, the repulsive force is small, and in the example shown in FIG. In the above embodiments, the tightening material was formed of layer 1 of a fiber band with good heat shrinkability (a weave band made of iron), but it could be made of a resin material such as polyester. It is also possible to use the impregnated rubber layer χ, and the combination of the rubber layer σ
-) The thermosetting resin layer is sufficiently cured during heating and vulcanization molding, and the cylindrical reinforcing layer 10 is fixed to the outer periphery of the nipple portion 8σ. Note that "ET, - narrowing of the cylindrical reinforcing layer 10'lf lrL
r, m portions 10αχ, two layers 10a as shown in Fig. 9 (bo σ)
, 1. The expansion pipe joint 1A is separated into layers 10α, 1Oh (/J outer periphery is tightened with layers 11α, 11b), and the expansion pipe joint 1A is thicker than the expansion pipe joint tVc. You have to withstand the internal pressure.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a known expansion pipe joint, and FIGS.
FIG. 5 is a side view of an expansion pipe joint according to an embodiment of the present invention, and FIG. 6 is an enlarged sectional view of the main part taken along line A.
7 is an enlarged sectional view taken along the line ■1-■ in FIG. 6, FIG. 8 is an example of the use of the expansion pipe joint, and FIG. 9 is an enlarged view of the expansion pipe joint according to another embodiment. FIG. 1... Expansion pipe joint, 2... Main body - 3... Rubber cylindrical body. 4...Central part, 5...Flange part, 6...Coating part, 7°゛. Annular flange plate, 8...l nipple part, 9...projection +
10...Cylindrical reinforcing layer-11...Tightening layer, addition...
・'f, 21...Flange, I...Pipe, 31...Flange. Agent Patent attorney Ehara Nozomi 2 people 11- Soku□

Claims (1)

[Claims] [Cylindrical body made of flexible material Q] In an expansion pipe joint equipped with hard annular flange plates at both ends,
The cylindrical body made of reheatable material covers and connects the outer surfaces of the annular flange plate and the outer surface of the annular flange plate. The cylindrical body has a shape in which a portion thereof bulges outward, and the cylindrical body made of a flexible material has a built-in cylindrical reinforcing layer extending from a portion covering the image nipple portion to the central main trunk portion. As it cools down,
The cylindrical reinforcing layer χ located on the outer periphery of the image nipple portion
Enclosure 1 - Expansion pipe joints with a built-in layer for tightening to prevent removal.