JPS6220438B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a plastic hose with a joint and a method for manufacturing the same.

[Prior Art] Conventionally, plastic hoses for connection have had metal joints attached to both ends of the hose by screwing or crimping, and the joints were connected to corresponding connection points. However, since plastic hoses do not have the same rubber elasticity as rubber hoses, the connection between the hose and metal fittings may loosen due to heat cycles caused by changes in the operating environment temperature or the temperature of the fluid flowing inside the hose. There was a risk of fluid leaking.

[Problems to be Solved by the Invention] The present invention has been made based on the above points, and provides a joint that does not cause internal fluid leakage from the end joint of a plastic hose even when subjected to long-term heat cycles. An object of the present invention is to provide a plastic hose with an attached plastic hose and a method for manufacturing the same.

[Means for Solving the Problems] The gist of the present invention is the following two points.

(1) having a thermosetting resin sleeve having an outer diameter approximately equal to the inner diameter of the hose and inserted into the end of the plastic hose with a portion protruding;
A plastic hose with a joint, characterized in that it has a plastic joint molded integrally with the protruding portion of the sleeve and the end of the plastic hose.

(2) A thermosetting resin sleeve having an outer diameter approximately equal to the inner diameter of the plastic hose and closed at one axial end is inserted into the end of the plastic hose so that the closed part protrudes. and integrally molding a plastic material over the projecting portion of the sleeve and the end of the plastic hose, and drilling a hole through the integrally molded plastic member and removing an obstruction at one end of the sleeve. A method for manufacturing a plastic hose with a joint, which comprises processing to form a joint.

[Function] The plastic hose with a joint and the manufacturing method thereof of the present invention include a thermosetting resin having an outer diameter approximately equal to the inner diameter of the plastic hose and one end in the axial direction being closed at the end of the plastic hose. Insert the sexual sleeve so that the occluded part protrudes,
integrally molding a plastic material over the protruding portion of the sleeve and the end of the plastic hose, and drilling a hole through the integrally molded plastic member to remove the blockage at one end of the sleeve; By molding the end of the plastic hose, the thermosetting resin sleeve, and the plastic joint to form a joint, the connecting end between the plastic joint and the end of the plastic hose is made of plastic. The material is thermally bonded by the high temperature during integral molding, eliminating any internal fluid leakage between the plastic joint and the end of the plastic hose. The end of the plastic hose, the thermosetting resin sleeve, and the plastic fitting are all made of polymeric materials and have approximately the same coefficient of thermal expansion, so even when subjected to heat cycle deterioration, the relationship between the end of the hose and the fitting will remain stable. No relaxation occurs. In addition, the thermosetting resin sleeve inserted into the end of the plastic hose prevents the hose end from deforming during molding of the plastic joint, and also significantly increases the mechanical strength of the plastic hose end during use. It is something.

In addition, in the method for manufacturing a plastic hose with a joint of the present invention, the purpose of providing a closing portion at one end of the sleeve is to prevent molded plastic material from flowing into the sleeve and sealing off the inside of the sleeve during the molding operation. It's for a reason.

[Example] Next, an example of a plastic hose with a joint and a method for manufacturing the same according to the present invention will be described with reference to the drawings.

1 to 5 show an embodiment of a plastic hose with a joint and a method of manufacturing the same according to the present invention.

First, attach the blockage part 3 to one end of the plastic hose 1.
A cylindrical sleeve 2 made of a thermosetting resin is inserted so that the closure 3 protrudes from the end of the plastic hose. Next, the end of the plastic hose 1 into which the sleeve 2 has been inserted is set in a joint forming mold (not shown), and plastic is poured into the mold and the protruding part of the sleeve 2 and the hose are formed by injection molding or the like. A joint portion 5 is formed integrally with the end portion. The reason why the closing part 3 is located at one end of the sleeve 2, that is, at the part protruding from the hose 1, is to prevent plastic from flowing into the sleeve during molding.

FIG. 2 shows the thus obtained joint part 5 and the hose end integrally formed. However, at this stage, the joint portion 5 does not yet have a through hole for communicating the hose, so a hole is drilled in the center of the joint portion 5 using a drill or the like to provide a through hole 6 that is slightly larger than the outer diameter of the sleeve 2.

FIG. 4 shows a side view of an embodiment of the plastic hose with a joint of the present invention produced through the above steps. The joint portion 5 of this example product is an eye joint. In the present invention, since the hose end and the joint part 5 are integrally molded in this way, the internal fluid does not leak from the connection part between the hose end and the joint, and the inner peripheral surface of the connection part is prevented from leaking. Since the sleeve is inserted with a thermosetting resin, it prevents the hose from collapsing during plastic joint molding, and at the same time significantly increases the mechanical strength of the hose end when the hose is in use. Further, by providing a closing portion 3 at one end of the sleeve 2, it is possible to completely prevent the molding material from flowing into the hose.

Furthermore, since the joint is made of plastic, it has the advantage that the hose end and the metal joint do not loosen due to heat cycle deterioration compared to conventional metal joints, and are lightweight and inexpensive.

The joint in the present invention is not limited to the eye joint as described above, but may be a threaded joint shown in FIG. 6 or a union nut shown in FIG. 7.

[Effects of the Invention] According to the plastic hose with a joint and the manufacturing method thereof of the present invention, it is possible to completely eliminate internal fluid leakage from the plastic hose end joint, and to provide a plastic hose with a joint that has excellent heat cycle resistance and is lightweight and inexpensive. A hose can be obtained and is industrially useful.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of a plastic hose with a joint and a method for manufacturing the same according to the present invention, and Figure 1 is a vertical sectional view of the end of the hose showing a state in which a sleeve is inserted. , Figure 2 is a side view of the hose end with integrally molded joint, and Figure 3 is a side view of the hose end with integrally molded joint.
A-A sectional view of the joint part in the figure, Figure 4 is the 2nd
Figure 5 is a side view of an embodiment of the plastic hose with a joint of the present invention in which a through hole is provided in the joint part, Figure 5 is a BB sectional view of the joint part in Figure 4, Figures 6 and 7 are The figures show other embodiments of the plastic hose with a joint of the present invention, in which Figure 6 is a partial sectional view of the end of the hose with an integrally molded threaded joint, and Figure 7 is a section of the end of the hose with an integrally molded union. FIG. 1: Plastic hose, 2: Sleeve, 3:
Closed part, 5: Joint part, 6: Through hole, 7: Threaded joint, 8: Union, 9: Union nut.

Claims (1)

[Scope of Claims] 1. A thermosetting resin sleeve having an outer diameter approximately equal to the inner diameter of the plastic hose and inserted into the end of the plastic hose with a portion protruding; A plastic hose with a joint, characterized in that it is provided with a plastic joint that is integrally formed on the protruding portion and the end of the plastic hose. 2. A thermosetting resin sleeve having an outer diameter approximately equal to the inner diameter of the plastic hose and closed at one axial end is inserted into the end of the plastic hose so that the closed portion protrudes; integrally molding a plastic material over the protruding portion of the sleeve and the end of the plastic hose, and drilling a hole through the integrally molded plastic member to remove the blockage at one end of the sleeve; 1. A method for manufacturing a plastic hose with a joint, the method comprising: applying a plastic hose to form a joint.