JPH09189392A - Safety pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety pipe joint to prevent rupture of a shearing ring under a designed value due to fatigue as a load of sudden rise of liquid pressure produced in a hose, or the like is accumulated. SOLUTION: Respective ring half part shaped groove half parts 5, 6 to be a ring shape at the time of jointing them are provided on joint end parts of both pipe joints on side surfaces of first and second pipe joints 1, 10, an elastic body ring 7 is inserted into an inside of a ring groove 4 jointing the grooves 5, 6, the first and second pipe joints 1, 10 are jointed by inserting a shearing ring 8 in a shape corresponding to the ring groove 4 on its outside, and an outer periphery of a ring groove part of the first and second pipe joints 1, 10 is covered with a resin cover 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a first pipe joint connected to one hose and a second pipe joint connected to the other hose, and the first pipe joint has a ball valve. And a spring that presses the ball valve toward the valve seat, and the second pipe joint is provided with an engaging member that supports the ball valve at a position away from the valve seat against the pressing force of the spring. , A safety pipe joint in which the first and second pipe joints are connected via a sharing ring.

[0002]

2. Description of the Related Art In a refueling device, in order to prevent a hose from being cut in the middle of a hose due to the movement of an automobile during refueling work, the hose is separated when a large pulling force is applied. A safety pipe joint having a valve that protects the oil and prevents oil from leaking is provided in the middle of the hose.

Various types of safety pipe joints are known. For example, in Japanese Patent Publication No. 6-50155 of the present applicant, a rotary ring is attached to the first pipe joint and A technique is disclosed in which the second pipe joint is connected via a fragile locking piece. Further, in U.S. Pat. No. 5,141,014, semicircular grooves are provided at the joint end portions on the side surfaces of the first pipe joint and the second pipe joint, respectively, and the share over the semicircular grooves is shared. A device having a ring link is disclosed.

However, in the refueling device, when the hydraulic pressure in the hose suddenly rises when the pump is started, or when the automatic closing nozzle detects the liquid level and automatically closes, this hydraulic pressure causes the safety pipe joint to operate. There is a risk that they act in the direction of pulling apart, these loads become repeated loads, and the fatigue load is accumulated in the sharing ring, the operating load drops below a predetermined value, and eventually fracture occurs.

[0005]

SUMMARY OF THE INVENTION Therefore, according to the present invention, stress is applied so that the shearing ring does not break below its design value due to fatigue due to accumulated load such as a sudden increase in hydraulic pressure generated in the hose. An object is to provide a safety pipe joint that can be relaxed.

[0006]

According to the present invention, there is provided a first pipe joint connected to one hose and a second pipe joint connected to the other hose, and the first pipe joint is provided. Accommodates a ball valve and a spring for pressing the ball valve toward the valve seat, and the second pipe joint supports the ball valve at a position away from the valve seat against the pressing force of the spring. In a safety pipe joint in which a joint is provided, and the first and second pipe joints are connected via a sharing ring, the joint ends of both pipe joints on the side surfaces of the first and second pipe joints are provided. An annular half-shaped groove half that becomes an annular shape at the time of joining is provided, and an elastic body ring is inserted inside the annular groove that joins these groove halves, and the outside of the elastic body ring corresponds to the annular groove. Shaped sharing ring is inserted. Then, it is preferable that the outer circumferences of the joint ends of the first and second pipe joints are covered with a resin cover.

Further, the annular groove and the sharing ring are preferably circular.

It is preferable that the annular grooves are provided on both sides of the joint ends of the first and second pipe joints.

The present invention is configured as described above, and the first and second pipe joints are connected by the shearing ring which is inserted into the annular groove at the time of joining, which is provided at the joint end portion of the side surface thereof. Then, when an abnormal pulling force acts on the hose, the sharing ring is cut and the first and second pipe joints are separated, the engaging element supporting the ball valve is separated from the ball valve, and the ball valve is released. It sits on the valve seat with the force of the spring, preventing oil from leaking from the hose.

Further, a sudden pressure change caused when the pump is started or when the automatic closing nozzle detects the liquid level and closes the valve causes a force for separating the pipe joint. Breakage of the shearing ring that occurs below a predetermined value due to repeated fatigue of such a force is prevented by the elastic ring interposed inside the shearing ring relaxing the load on the shearing ring.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a safety pipe joint embodying the present invention in a connected state. The hose A on the right side in the drawing is connected at its right end to an oil supply device (not shown), and at the other end (left end in the drawing) is connected to the first pipe joint 1 via the connecting piece 1a. On the other hand, the left-side hose B is connected at its left end to a fueling nozzle (not shown), and at the opposite end (right end in the drawing) to the second pipe joint 10 via a connecting piece 10a. The first pipe joint 1 has a small diameter portion 2 on the side of the second pipe joint 10.
And the small diameter portion 2 has an opening portion 10 of the second pipe joint 10.
It can be fitted into b, and its engaging surface is sealed by an O-ring 12. A valve seat 3 is formed inside the first pipe joint 1, and a ball valve 14 seated on the valve seat 3 and closing the passage P is pressed by the action of a spring 13.

On the other hand, the second pipe joint 10 has an engaging element 1 for supporting the ball valve 14 at a position apart from the valve seat 3 in the assembled state against the pressing force of the spring 13.
6 are provided.

FIG. 2 shows the first and second pipe joints 1,
The side view of the joining part of 10 is shown, The side surface of the 1st and 2nd pipe joints 1, 10 and the joint half J of the annular half part shape which becomes annular at the time of joining to the joint end part J of both pipe joints. Are provided respectively. An elastic ring 7 is provided inside the annular groove 4 formed by joining the groove half 5 and the groove half 6, and an annular shearing ring 8 is provided outside the elastic ring 7.
Is inserted, and the first pipe joint and the second pipe joint are connected by the sharing ring 8. The outer periphery of the joint end J of the pipe joints 1 and 10 by the sharing ring 8 is covered with a resin cover 17. The cover 17 is held by a retaining member 20 and a step portion 21.

The shape of the annular groove 4 is not limited to a circular shape, but may be an oval shape or a closed shape such as a square shape. Further, in the illustrated example, two annular grooves 4 are provided, one on each side of the joint end, but one or three or more annular grooves 4 may be provided.

Next, the operation will be described.

In normal use, as shown in FIG. 1, the first and second pipe joints 1 and 10 connected to the hoses A and B are provided with grooves at the joint ends J on their side surfaces. The shear ring 8 inserted into the annular groove 4 formed by the half portions 5 and 6 and the elastic ring 7 inserted inside thereof are connected. The resin cover 17 that covers the outer circumference prevents the elastic ring 7 and the sharing ring 8 from falling off.

The ball valve 14 in the pipe joint 1 is pushed by an engaging member 16 provided in the second pipe joint 10 and supported at a position apart from the valve seat 3, and therefore oil is passed through the passage P to prevent the oil from flowing. Can be distributed. The joint between the first and second pipe joints is the O-ring 12 inserted in the small diameter portion 2 of the first pipe joint 1.
Sealed with.

When a tensile force of a predetermined value or more is applied to the hoses A and B, the sharing ring 8 is broken and the first pipe joint 1 and the second pipe joint 10 are separated from each other, as shown in FIG. The ball valve 14 separates from the support of the engagement element 16 and the spring 13
As a result, the valve seat 3 is seated, and the outflow of oil in the hose A is stopped.

On the other hand, a force that separates the first and second pipe joints 1 and 2 is also generated by a rapid pressure change that occurs when the pump is started or when the automatic closing nozzle detects the liquid level and closes the valve. This tensile force is applied from the groove halves 5 and 6 to the elastic ring 7
Since it acts on the sharing ring 8 via the elastic ring 7 and is relaxed by the elasticity of the elastic ring 7, it is possible to prevent the sharing ring 8 from being accumulated under a fatigue load and being damaged at a predetermined value or less.

[0021]

As described above, according to the present invention, the force acting on the sharing ring acts via the elastic ring, and the valve is closed when the pump is started or the automatic closing nozzle detects the liquid level. Since the tensile force caused by a sudden pressure change caused by the stress is relaxed by the elastic ring, the shearing ring is prevented from breaking below a predetermined value due to fatigue stress.

Further, since the contact between the shearing ring and the annular groove is made through the elastic ring, a predetermined amount of breakage can be realized without causing one-sided contact due to manufacturing precision.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a side view showing a joint portion of the first and second pipe joints of FIG.

FIG. 3 is a sectional view showing the safety joint of FIG. 1 in operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st pipe coupling 2 ... Small diameter part 3 ... Valve seat 4 ... Annular groove 5, 6 ... Groove half part 7 ... Elastic ring 8 ... Sharing ring 10・ ・ ・ Second pipe joint 12 ・ ・ ・ O ring 13 ・ ・ ・ Spring 14 ・ ・ ・ Ball valve 16 ・ ・ ・ Engager 17 ・ ・ ・ Resin cover

Claims (4)

[Claims] 1. A first pipe joint connected to one hose, and a second pipe joint connected to the other hose,
The first pipe joint accommodates a ball valve and a spring that presses the ball valve toward the valve seat, and the second pipe joint separates the ball valve from the valve seat against the pressing force of the spring. A safety pipe joint in which an engaging element for supporting the position is provided, and the first and second pipe joints are coupled via a sharing ring, wherein both pipe joints on the side surfaces of the first and second pipe joints are provided. The groove ends of the annular half shape that become annular at the time of joining are respectively provided at the joining ends of, and the elastic ring is inserted inside the annular groove that joins these groove halves, and the outside of the elastic ring is A safety pipe joint in which a sharing ring having a shape corresponding to the annular groove is inserted. 2. The safety pipe joint according to claim 1, wherein outer peripheries of joint ends of the first and second pipe joints are covered with a resin cover. 3. The safety pipe joint according to claim 1, wherein the annular groove and the sharing ring have a circular shape. 4. The safety pipe joint according to claim 1, wherein the annular groove is provided on both sides of the joint ends of the first and second pipe joints.