JP2000018463A - Quick coupling unit for preventing back flow - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a quick coupling unit to viscous or mod-like fluid by comprising two cock valves independently working from a check valve for opening and closing a through hole in a main body. SOLUTION: The feed of the viscous fluid W flowing from an adapter 31 side of a main body part 3 of a back flow prevention quick coupling unit 10 to a plug side is inhibited by a cock valve 4 in a state that the plug 7 is connected to the main body and a check valve 6 is kept in its open state. The viscous fluid W is fed to the plug side by communicating an opening 42 of the cock valve and a through-hole 5 through a tongue part 43. In a case when the plug 7 is demounted from the main body, it can be easily demounted by setting the position of the cock valve in a close state regardless of the open state of the check valve 6 without affected by the feed pressure from the adapter side. The plug can be demounted in a state that the splashing of the viscous fluid generated by the delay in returning of the check valve is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quick joint for backflow prevention, and more particularly to a quick joint for a fluid injection hose used in earth retaining (dome) construction. A conventional check valve and another cock valve are formed in the main body of both the main body and the plug constituting the quick coupling so as to prevent the backflow of fluid in the construction side hose when the plug is opened from the main body. The present invention relates to a quick joint for preventing backflow.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional quick coupling.
This joint is composed of two members, a main body 1 'and a plug 2', and a check valve 3 'is provided inside the main body 1'. The check valve 3 ′ is normally pressed against the valve seat 32 ′ by the spring 31 ′ and closes the through hole 4 ′, and when the plug 2 ′ is inserted into the main body 1 ′, the check valve 3 ′ is closed. The closed state is released.

[0003]

The quick fitting is used as a hose or pipe fitting for sending and discharging a fluid.
The fluid was of a uniform nature, for example a non-viscous, non-muddy fluid. The present invention seeks to provide a quick coupling that can be applied to viscous or muddy fluids. SUMMARY OF THE INVENTION It is an object of the present invention to provide a quick joint which can be used as a hose joint for feeding a viscous fluid, for example, a urethane liquid containing an expanding agent for soil retention.

[0004]

When a conventional quick joint is applied to a viscous fluid, for example, urethane liquid containing an expanding agent, the viscous fluid scatters to the outside when connecting and disconnecting the main body and the plug. In some cases, sticking to the body, especially to the hair, reduces workability. The present invention has devised a quick coupling which can be applied to a viscous fluid by forming two valves in a main body, a check valve for opening and closing a through hole and another cock valve which operates separately.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rapid joint for preventing backflow according to the present invention will be described with reference to FIG. FIG. 1 shows only a plug and a main body of a main body constituting a quick coupling. The main body 1 is formed by coupling a cap 2 and a main body portion 3, and the cap 2 carries a ball 21. Socket part 22 and sleeve 2 covered with this socket part
3 and a cock valve 4 is provided in the main body 3 provided with the adapter 31.

A through hole 5 is formed in each of the two members 2 and 3, and a check valve 6 that opens and closes the through hole is a valve that comes into contact with a valve seat 61 formed by packing via a spring 63. The structure has a surface 62. The cock valve 4 is installed so as to penetrate the main body 3, and is positioned so as to communicate with the through hole 5 only when the opening 42 formed in the body 41 matches the through hole 5.

In order to make the opening 42 coincide with the through hole 5, the knob 33 is rotated by 90 degrees. The knob 43 is formed integrally with the head projection 44 of the body 41. Also knob 43
As shown in FIG. 2, as shown in the plan view, the tip is formed in an arrow shape so that the communication between the opening 42 and the through hole 5 can be clearly shown. 46 is formed so as to be allowed to rotate about 90 ° by abutting the surface of the main body 3.

The case where the rapid joint for preventing backflow according to the present invention is applied to a urethane liquid containing an expanding agent (hereinafter referred to as "viscous fluid") will be described as follows. As shown in FIG. 3, the viscous fluid W (see the arrow) flowing from the adapter 31 side of the main body 3 of the quick-flow preventing quick coupling 10 indicated by reference numeral 10 connects the plug 7 to the main body 1 and opens the check valve 6. Even at the stage where the state is maintained, the supply to the plug side is prevented by the cock valve 4.

As shown in FIG. 4, the viscous fluid W in the above state is supplied to the opening 42 of the cock valve and the through hole 5 through the knob 43.
Is supplied to the plug side. When the plug 7 is removed from the main body 1, as shown in FIG. 1, the cock valve is set to the closed state so that the feed pressure from the adapter side is affected regardless of the open state of the check valve 6. It can be easily removed without the need. The present invention is not limited to the embodiment, and for example, the type of the viscous fluid or the direction of supply / discharge of the fluid to correspond to the plug side or the adapter side can be arbitrarily selected.

[0010]

The present invention relates to a quick joint for preventing backflow to be applied to a viscous fluid used for earth retaining and the like. By installing a cock valve on the body of the joint, the viscous fluid generated by the return delay of the check valve can be reduced. The plug can be removed in a state where the plug is prevented from flying out. The thus constructed quick coupling for preventing backflow according to the present invention is capable of preventing the effect of splashed fluid on the body, which has conventionally occurred when the viscous fluid has a pressure of 50 kg / cm ² , for example.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a quick joint for preventing backflow.

FIG. 2 is an explanatory diagram of a knob portion of a cock valve.

FIG. 3 is an explanatory view of the operation of a quick joint for preventing backflow.

FIG. 4 is a diagram illustrating the operation of the quick joint for preventing backflow.

FIG. 5 is an explanatory view of a conventional quick coupling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Quick coupling for backflow prevention 1 Main body 2 Cap 3 Main part 4 Cock valve 41 Body 42 Opening opening 43 Knob part 45 Arrow 46 Claw 5 Through hole 6 Check valve 7 Plug

Continued on front page F term (reference) 3J106 BC04 BC12 BD01 BE29 CA01 EA03 EB07 EC02 ED32 EE13 GA01 GA04 GA05 GA21 GA30 GA31

Claims (2)

[Claims] 1. A check valve that is formed by a plug mounting socket portion and a main body portion having an adapter portion, and that is provided with a check valve that is opened and closed by a plug in a communication hole between the two members, and that the main body portion is manually opened and closed. A quick joint for preventing backflow characterized by forming a cock valve. 2. The quick joint for preventing reverse flow according to claim 1, wherein a knob for opening and closing the cock valve is formed with an arrow shape indicating an opening direction and a blocking claw allowing rotation of substantially 90 °.