JP3332227B2 - Rubber composite pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber composite pipe joint used for connecting pipes such as a pipe for water supply and drainage and a pipe through which an optical fiber passes.

[0002]

2. Description of the Related Art Conventionally, as a pipe joint for water supply and drainage, a pipe joint made of vinyl chloride, which can be easily mass-produced, has been widely used. The pipe joint made of vinyl chloride is used by setting a packing joint and a clearance so that a fine adjustment such as a deviation can be made within a predetermined allowable range by injection molding.

[0003] However, in the use of joints for temporary piping at underground or above ground water supply and drainage sites, for example, fish markets, paddy fields, civil engineering construction sites, etc., bending due to sudden piping changes and climbing of work vehicles are also required. As well as being a corresponding material, a predetermined rigidity is required without affecting the amount of water, and these conditions could not be satisfied with the conventional polyvinyl chloride pipe joint.

For example, a certain degree of rigidity is required in order to cope with a bending caused by a sudden change of piping or a climbing of a work vehicle. However, if the rigidity is increased, a watertightness of a connection portion with a pipe and a displacement at a joint portion are required. There is a problem in prevention, etc.
Conversely, if the pipe joint is made somewhat flexible so as to ensure the watertightness of the connection portion with the pipe and prevent the displacement at the joint portion, there is a problem that the pipe joint is crushed by the riding of the work vehicle, which hinders water supply and drainage.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and can prevent watertightness and displacement at a connection portion with a pipe. It is an object of the present invention to provide a rubber composite pipe joint that can cope with riding.

[0006]

In order to solve the above problems, a rubber composite pipe joint according to the present invention comprises a pipe joint 1 made of a diene or olefin rubber and a joint center part 2 and a joint center part 2. The joint center part 2 is made to be approximately 90 degrees in JIS hardness and the hardness of the joint end part 3 is made softer than that of the joint center part 2. It is a feature. With such a configuration, the pipe 5 is connected to the rubber pipe joint 1 by fitting the end of the pipe 5 into the connecting end 3.
In this case, since the connecting end portion 3 is softer than the joint center portion 2, the fitting can be easily performed, and since the connecting end portion 3 is soft, it can be connected in a watertight manner or can be connected so as not to be displaced. On the other hand, since the hardness of the joint center portion 2 to which the pipe 5 is not connected is approximately 90 degrees in JIS hardness, it can be prevented from being collapsed even if bending or climbing of a work vehicle occurs due to a sudden change in piping. It is made of rubber and does not crack.

A plurality of projections 4 are formed on the inner surface or the outer surface of the connection end 3, and the material mixing ratio of the connection end 3 having the projection 4 is 62% by weight of SBR raw material or EPDM raw material, and vulcanization. It is preferable that the composition comprises 3% by weight of an accelerating additive, 7% by weight of a softener, and 28% by weight of a filler, and has a hardness of approximately 60 degrees in JIS hardness. With such a configuration, the projection 4 is protruded from the inner surface to the outer surface, and despite the thickness of this portion being changed from the other portions, the connection is made watertight with a simple configuration, It is possible to form the flexible connecting end 3 which is difficult to be formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the accompanying drawings.

The pipe joint 1 is constructed by integrally forming connection ends 3 at both ends of a joint center portion 2. The pipe joint 1 is used to connect the pipes 5 to each other, and is connected by fitting the ends of the pipes 5 into the connection joint portions 3 at both ends of the pipe joint 1. The pipe joint 1 is made of rubber, and a rubber material constituting the pipe joint 1 is a gen-based rubber called a vulcanized type, such as SBR (styrene-butadiene rubber). (Ethylene / propylene rubber).

The center part 2 of the rubber pipe joint 1 is JIS.
A hardness is almost 90 degrees, and the connecting ends 3 at both ends are
Is softer than the joint center portion 2 (for example, approximately 60 degrees in JIS hardness). The JIS hardness is JIS hardness
It is measured based on K6301.

The manufacture of the rubber pipe joint 1 having the above configuration is performed as follows.

The blending ratio of the material that forms the joint center part 2 of the pipe joint 1 and has a hardness of approximately 90 degrees in JIS hardness is SBR.
55% by weight of raw material or EPDM raw material, 4% by weight of an additive such as a vulcanizing agent for accelerating the vulcanization reaction, 3% by weight of a softening agent such as stearic acid for softening the raw material and making the additive easy to knead, Agent, that is, 38% by weight of a filler such as carbon black for the purpose of adjusting the hardness, which was blended in the blending step of FIG.
In the kneading step of FIG. 6B, kneading is performed.
A sheet-like raw material is formed in the sorting step (c).

On the other hand, the mixing ratio of the material that forms the connection end 3 of the pipe joint 1 and has a hardness of approximately 60 degrees in JIS hardness is S
62 wt% (mass%) of BR raw material or EPDM raw material,
3% by weight (mass%) of additives such as vulcanizing agents, 7% by weight of softener
(% By mass), 28% by weight of filler such as carbon black
(% By mass), and as shown in FIG.
And then kneading in the kneading step of FIG. 6 (b ′), and then forming a sheet-like material in the dispensing step of FIG. 6 (c ′).

Then, the sheet-like raw materials of two kinds of hardness obtained in the steps (c) and (c ') are cut and preformed in (d) and (d'), respectively. In the process, the raw materials having the above-mentioned two hardnesses were cut at predetermined positions and in such a manner as to be easily formed, and then at positions corresponding to the center and both ends of the pipe joint 1 to be formed in the mold. Each of them is filled and press-formed (this is a hot press-forming step shown in FIG. 6 (e)). Here, the mold temperature at the time of press molding in the press molding step is about 160 ° C., but the mold temperature is adjusted according to the outside air temperature or room temperature.

An antioxidant and an antioxidant may be added to the material of the above-mentioned pipe joint 1 if necessary. As a filler, other carbon, calcium carbonate, A filler such as talc may be used, or a plurality of types of fillers may be used in combination.

In the rubber pipe joint 1 of the present invention manufactured as described above, the hardness of the joint center portion 2 is substantially 90 degrees, and the hardness of the connecting end portions 3 at both ends is equal to the joint center portion 2. Therefore, when the pipe 5 is fitted and connected using the rubber pipe joint 1 of the present invention, the connecting end 3 of the pipe joint 1 is soft. Because of this, the end of the tube 5 can be easily fitted, and since it is soft, the adhesion is improved, the watertightness is excellent, and the tube is hardly displaced. Further, since the hardness of the joint center portion 2 to which the pipe 5 is not connected is substantially 90 degrees, it is possible to prevent the joint 5 from being crushed even if the pipe is bent or a work vehicle runs over due to a sudden change in piping. In addition, since it is made of rubber, it does not break. Therefore, even underground or above ground water supply and drainage sites, for example, temporary pipes at fish markets, paddy cultivated lands, civil engineering construction sites, etc., can be connected with good watertightness, and even if a load acts, the center of the joint of the pipe joint 1 can be connected. The tubes 5 can be reliably connected to each other without crushing or cracking of the tubes 2.

By the way, the connection end 3 of the pipe joint 1 of the present invention.
A plurality of projections 4 are annularly provided on the inner surface or the outer surface of the connection end 3. Is also soft, and in the embodiment, the hardness is approximately 60 degrees).

FIG. 1 shows an example in which a plurality of projections 4 are provided on the inner surface of the connection end 3 of the pipe joint 1. In this embodiment, the pipe 5 is connected by fitting the end of the pipe 5 into the connection end 3 of the pipe joint 1. The flexible projection 4 on the inner surface of the connection end 3 is 5, so as to secure watertightness and to prevent displacement.

In the case where the projection 4 is provided on the inner surface of the connection end 3, a fastening band hooking recess 7 is formed on the outer surface of the connection end 3 as shown in FIG. The fastening band hooking concave portion 7 is provided at a position corresponding to the protrusion 4 in the inward and outward directions. By fastening the fastening band 8 to the fastening band hooking concave portion 7 by positioning the fastening band 8, the inner surface of the connecting end portion 3 is formed. Can be pressed tightly against the outer surface of the pipe 5 so that
Watertightness is further improved, and deviation prevention is more reliably achieved.

In the embodiment shown in FIGS. 1 and 2 described above, the structure in which the end of the pipe 5 is fitted into the connecting end 3 is shown. However, as shown in FIG. Part 3
The structure may be such that the end of the tube 5 is fitted on the outer surface side of the tube. In the structure in which the end of the pipe 5 is fitted on the outer surface side of the connecting end 3 in this manner, a plurality of projections 4 are provided on the outer surface of the connecting end 3 of the pipe joint 1. In this case, as shown in FIG. 4, the pipe 5 is connected by fitting the end of the pipe 5 to the outer surface of the connection end 3 of the pipe joint 1 via an adhesive. The flexible projection 4 on the outer surface of the connecting end 3 is in close contact with the inner surface of the pipe 5, thereby ensuring watertightness and preventing displacement.

As shown in FIGS. 1 and 3, the rubber pipe joint 1 of the present invention has a structure in which the center of the joint center part 2 and the center of the connection end part 3 coincide with each other. As shown in FIG. 5, the center O2 of the joint center 2 and the center O2 of the connection end 3
There is a pipe joint structure of different diameter where the gap is different. In addition, the joint center portion 2 is not limited to a straight cylindrical shape, and may be, for example, 90
A curved pipe joint having an arbitrary angle such as 60 degrees, 45 degrees, or the like may be used.

[0022]

As described above, according to the first aspect of the present invention, there is provided a rubber composite pipe joint made of a diene-based or olefin-based SBR material, wherein the rubber composite pipe-joint is connected to the center of the joint. And a connecting end integrally connected to both ends of the joint central portion. The hardness of the joint central portion is approximately 90 degrees in JIS hardness, and the hardness of the connecting end portion is softer than the central portion of the joint. Therefore, when connecting and connecting the end of the pipe to the connecting end, the fitting can be easily performed, and since the connecting end is soft, watertightness is improved, and it is ensured that there is no deviation The center of the joint where the pipe is not connected has a hardness of JIS.
The hardness is almost 90 degrees, so it will not be crushed even if it is bent due to a sudden change of piping or gets on a work vehicle. It does not impair the function.

According to the second aspect of the present invention, in addition to the effects of the first aspect, a plurality of projections are formed on the inner surface or the outer surface of the connecting end, and these projections are formed. The material mixing ratio of the connecting end portion is composed of 62% by weight of SBR raw material or EPDM raw material, 3% by weight of vulcanization accelerating additive, 7% by weight of softener and 28% by weight of filler, and the hardness is almost 60 degrees in JIS hardness Since the projections are provided on the inner surface or the outer surface so that the thickness of this portion becomes thicker, without sinking during cooling and solidification, watertight connection with a simple configuration, It is possible to form a flexible connecting end that is not easily shifted.

[Brief description of the drawings]

FIG. 1 is a partially broken front view of a pipe joint of the present invention.

FIG. 2 is a cross-sectional view showing a state in which an end of the pipe is fitted and connected to a connection end of the pipe joint.

FIG. 3 is a partially cutaway front view of another embodiment of the pipe joint of the above.

FIG. 4 is a cross-sectional view showing a state in which an end of the pipe is fitted and connected to a connection end of the pipe joint.

FIG. 5 is a partially cutaway front view of yet another embodiment of the pipe fitting.

FIG. 6 is an explanatory view showing a manufacturing order of the pipe joint of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Joint center part 3 Connection end 4 Projection

──────────────────────────────────────────────────続 き Continuing on the front page (72) Hisato Minato 2-1-2, Otodatoricho, Kasugai-shi, Aichi Prefecture Minato Rubber Industry Co., Ltd. (72) Masao Takeda Inventor Masao Komaki, Aichi Prefecture 1 Examiner in Araki Die & Mfg. Co., Ltd. Takeshi Shinkai (56) References JP-A-50-82621 (JP, A) JP-A-4-64779 (JP, A) JP-A-5-287988 (JP, A) JP-A-8-326969 (JP, A) JP-A-11-30373 (JP, A) Patent 2854473 (JP, B2) Patent 2879549 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB) Name) F16L 21/00-21/08 F16L 27/00-27/02 F16L 27/10-27/113 F16L 47/20

Claims (2)

(57) [Claims] 1. A pipe joint made of a diene-based or olefin-based rubber is constituted by a joint central portion and a connecting end integrally connected to both ends of the joint central portion.
A composite pipe joint made of rubber, wherein an S hardness is set to approximately 90 degrees and a hardness of a connection end portion is softer than a center portion of the joint. 2. A plurality of protrusions are formed on an inner surface or an outer surface of a connection end, and a material mixing ratio of the connection end having the protrusion is S.
The material is composed of 62% by weight of BR raw material or EPDM raw material, 3% by weight of vulcanization accelerating additive, 7% by weight of softener and 28% by weight of filler, and has a hardness of approximately 60 degrees in JIS hardness. Item 7. A rubber composite pipe joint according to Item 1.