JP2544036B2 - Safety pipe joint - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has a refueling hose inside,
Further, the present invention relates to a safety pipe joint which is interposed in the middle of a double hose having a vapor recovery hose formed on the outside.

[0002]

2. Description of the Related Art For example, as seen in a gas station, an oil supply hose is used when oiling an automobile. On the other hand, since vapor flowing out from a gasoline tank during refueling has a risk of ignition, it is known that vapor is collected in, for example, an underground tank.

However, since the operability is poor when the fuel supply hose and the vapor recovery hose are constructed separately, a double hose has been developed in which the fuel supply hose is arranged inside and the vapor recovery hose is arranged outside.

By the way, if the vehicle is carelessly started during refueling, an abnormal force may be applied to the double hose, which may damage the refueling device. Therefore, a safety pipe joint should be inserted in the middle of the double hose. For example, a technique in which the safety pipe joint portion is separated when an abnormal force acts is disclosed in US Pat. No. 47.
No. 63683.

However, in such a known technique, since the two valve bodies are provided on the fueling machine side and the fueling nozzle side, the weight becomes heavier and the operability deteriorates.

Therefore, the present applicant has filed Japanese Patent Application No. 3-61994.
No. 1 provided a safety hose fitting for a double hose that has good operability during refueling work.

[0007] According to the proposal, in the safety pipe joint interposed in the middle of the double hose in which the refueling hose is formed on the inner side and the vapor recovery hose is formed on the outer side, the first and second removably connected safety pipe joints Consisting of a part and a second part, the first
The first housing that constitutes the portion is rotatably coupled to the second housing that constitutes the second portion via a shear pin, and a tubular valve box is provided inside the first housing. A valve body, which is pressed by a spring biased toward the second portion side, is housed therein, the valve box is connected to an oil supply hose, the first housing is connected to a vapor recovery hose, and the second housing is provided with the valve. An inner cylinder portion communicating with the box is provided, a pushing member for pressing the valve body is provided on the inner cylinder portion, the inner cylinder portion is connected to an oil supply hose, and the second housing is connected to a vapor recovery hose. .

[0008]

Although the above proposal is effective, the first housing and the valve box are integrally formed by being connected by a plurality of ribs, and are formed by casting. Therefore, the shape is complicated, the core is troublesome,
High casting defect rate. Moreover, it is difficult to machine the liquid passage side of the valve box.

An object of the present invention is to provide a safety pipe joint having improved castability and machinability of the first portion on the side where the valve box is provided.

[0010]

SUMMARY OF THE INVENTION A safety pipe joint according to the invention comprises a first portion and a second portion separably connected to each other with an oil passage formed inside and a vapor passage formed outside. The first housing forming the first portion is rotatably coupled to the second housing forming the second portion via a shear pin, and a cylindrical valve box is provided inside the first housing. A valve body, which is pressed by a spring biased toward the second portion, is housed in the valve box, the valve box is connected to an oil supply hose, the first housing is connected to a vapor recovery hose, and the second housing is connected to the second housing. Is provided with an inner cylinder portion that communicates with the valve box, the inner cylinder portion is provided with a pushing member that presses the valve body, and the inner cylinder portion is connected to an oil supply hose,
In the safety pipe joint connected to the vapor recovery hose, the second housing is provided with a plurality of ribs extending inward in the radial direction on the first housing, and a threaded portion is formed at an edge of the rib. The valve box is screwed and fixed to the threaded portion.

It is preferable that the screw portion is formed on a portion other than the chamber wall in which the valve body of the valve box is housed. Further, when the valve box is screwed onto the ribs, a fixing agent (for example, product name Loctite 60) is used.
It is preferable to fix it in 1).

In the present invention constructed as described above, the first housing can be cast as a single body, the core is simple, and the castability is improved. In addition, the valve body alone has good machinability and can be processed by an automatic lathe.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the refueling nozzle 1
The refueling machine 50 provided with the case 5 is installed upright on the ground.
1, and an underground tank 52 is buried underground.

An oil supply pipe 53 extends from the underground tank 52 into the case 51. A pump 54 and a flow meter 55 are connected to the oil supply pipe 53, and the amount of oil measured by the flow meter 55 is displayed on a display 56.

The oil supply pipe 5 is provided near the outside of the case 51.
3 is connected to the double hose 57 via the elbow 100,
The hose 57 is supported by a flexible column 58 that is erected on the case 51, and is folded back to connect the oil supply nozzle 1 to the tip thereof. Therefore, the hose does not come into contact with the ground when removing the nozzle 1 from the nozzle hook N for refueling and refueling. The hose 57 is provided with a safety pipe joint 59 to prevent sudden pulling force.
The hose is designed to be separated at this safety pipe joint. As will be described later, the safety pipe joint 59 is provided with a valve element so that when the hose is separated, the action of this valve prevents oil from flowing out.

In order to collect the vapor generated in the tank of the automobile during the refueling work, a known vapor collector (not shown) is provided in the refueling nozzle. It flows through the vapor passage of the heavy hose 57 into the vapor pipe 90 at the elbow 100 and is collected in the underground tank 52. In FIG. 1, solid arrows indicate the flow of oil,
The dotted line shows the flow of vapor.

Next, an embodiment of the present invention will be described with reference to FIGS.

The safety pipe joint, generally designated by the numeral 59, is designed to separate when an excessive pulling force is applied, for example when the vehicle runs during a refueling operation, and therefore
It is composed of a first part A and a second part B, and the first part A
Is connected to the double hose 57 on the refueling machine 50 side, and the second portion B is connected to the double hose 57 on the refueling nozzle 1 side.

The first part A includes a first housing 3 having a relatively large diameter, and one of the first housings 3 has a second part B.
The second housing 4 and the second housing 4 are connected by a share pin 17 described later. A cylindrical valve box 10 is housed inside the first housing 3, and the first housing 3 and the valve box 1
A vapor passage R is formed between the vapor passage R and zero. The valve box 10 has an enlarged diameter portion 10a, and a coil spring 11 is provided in this portion.
The spherical valve body 13 biased toward the valve seat 12 is accommodated therein.

Referring also to FIG. 4, a male screw portion 10b is formed on the outer periphery of the valve box 10 at the portion on the oil dispenser 50 side excluding the enlarged diameter portion 10a. On the other hand, four ribs 3a are provided on the inner side of the first housing 3 so as to project evenly around the circumference. Is formed with a female screw portion 3b that is screwed into the male screw portion 10b. And valve box 1
In No. 0, the male screw portion 10b is screwed into the female screw portion 3b of the rib 3a, further fixed by a fixing agent (for example, Loctite 601 under the trade name), and positioned at the illustrated position. The male screw portion 10b is partially formed in the valve box 10 in order not to reduce the strength of the thin peripheral wall of the expanded diameter portion 10a, and the length of the male screw portion 10b allows the valve box 10 to be attached to the first housing 3a.
This is for positioning with respect to.

The second housing 4 cooperates with the first housing 3 and has an end portion having a stepped portion 46. The rotating ring 8 is fitted between the step portion 46 and the stop ring 7. The inner cylinder portion 15 inside the second housing 4 cooperates with the valve box 10, and when the first portion A and the second portion B are joined, the spherical valve body 13 is protected against the coil spring 11. A pushing member 16 for separating the valve seat 12 from the valve seat 12 is provided. To connect both housings, the step portions 45 and 46 of the first housing 3 and the second housing 4 are butted together, and the first housing 3
When the shear pin 17 is inserted into the rotating ring 8 from outside, the first portion A and the second portion B are rotatably connected, and the valve body 13 is pushed open by the pushing member 16. The joint surface is sealed with a seal 9. A chain line X in the drawing is a separation surface.

In order to connect the double hose 57 to the first portion A, an intermediate pipe 20 having a flange 21 in the middle is fitted at the end of the inner oil supply hose 62, and the flange 21 is provided with the oil supply hose. The ends of 62 are engaged. The intermediate pipe 20 is fastened integrally with the oil supply hose 62 by the fastening body 22. Below the flange 21 of the intermediate pipe 20, a spacer 23 is attached by a stop ring 24.
A plurality of through holes 25 are formed in the spacer 23 in the axial direction, and these through holes 25 serve as vapor passages. The spacer 23 has a step portion 4 formed at the lower end of the outer tube 30.
1 is engaged. The outer pipe 30 has a larger diameter than the refueling hose 62, and thus a vapor passage 42 is formed between the outer peripheral surface of the refueling hose 62 and the inner peripheral surface of the outer pipe 30. A flange 31 is provided at an intermediate portion of the outer pipe 30 so as to project outward in the radial direction, and a plurality of ring-shaped projections 33, 33 are provided at a predetermined interval on an outer peripheral portion above the outer pipe in the radial direction. The protrusion 33, 33 and the O-ring 66 are formed so as to project inward, and a bellows-shaped vapor recovery hose 76 is airtightly mounted by engaging the recess thereof. The outer peripheral portion of the portion to which the hose 76 is attached is protected by the protective member 65.

A rotary fastener 40 is used to connect the first portion A of the safety pipe joint 59 and the double hose 57.

A female screw 47 is screwed on the inner peripheral surface of the connecting flange 63 of the first portion A. And the rotation fastener 40
A male screw 48 for screwing the female screw 47 is screwed on the outer peripheral surface of the. The inner peripheral surface of the rotary fastener 40 is rotatably engaged with the outer peripheral surface of the outer tube 30, and its upper end is engaged with the flange 31 and its lower end is engaged with the stop ring 32 provided on the outer tube 30. ing. Therefore, when the lower end of the intermediate pipe 20 is inserted into the valve box 10 and the rotary fastener 40 is screwed onto the inner peripheral surface of the connection flange 63 and rotated, the double hose 57 is connected to the first portion A. .

Since the double hose 57 is rotatable with respect to the first portion A as described above, the seal 14 is provided on the rotating surfaces of the valve box 10 and the intermediate pipe 20, and the rotary tightening tool 4 is provided.
A seal 34 is provided on the surfaces of rotation of 0 and the outer tube 30.

The structure of the safety pipe joint 59 for connecting the second portion B and the double hose 57 is the same as the structure for connecting the first portion A and the double hose 57. Therefore, the same reference numerals are given to the main elements, and the duplicate description will be omitted.

As described above, the valve housing 10 is screwed and fixed to the first housing 3, so that the first housing 3 can be easily cast, and the valve housing 10 can be easily machined and the automatic lathe can be machined. It can be processed in.

[0028]

Since the present invention is configured as described above, it is possible to improve the castability of the first housing of the first portion on the side where the valve box is provided and reduce the defective rate.

Further, it is possible to improve the machinability of the valve box and enable it to be processed by an automatic lathe.

Further, it is possible to omit the conventional leak test of the liquid passage of the valve box.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an example of a fuel dispenser to which the present invention is applied.

FIG. 2 is a sectional view showing an embodiment of a safety pipe joint.

FIG. 3 is a sectional view showing a state in which a safety pipe joint is separated.

FIG. 4 is a sectional view taken along the line YY of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Refueling nozzle 3 ... 1st housing 3a ... Rib 3b ... Female screw part 4 ... 2nd housing 10 ... Valve box 10a ... Expanding part 10b ... Male screw part 11 ... Spring 12 ... Valve seat 13 ... Valve body 15 ... Inner cylinder part 16 ... Push member 17 ... Share pin 20 ... Intermediate pipe 21 ... Flange 33 ... Protrusion 50 ... Protective member 57 ... Double hose 59 ... Safety pipe joint 62 ... Refueling hose 76 ... Vapor recovery hose A ... First part B ... Second part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 2-166097 (JP, A) JP 59-48912 (JP, B2) JP 47-42012 (JP, Y2)

Claims (1)

(57) [Claims] 1. A first housing comprising a first portion and a second portion, which are separably connected to each other, having an oil passage formed inside and a vapor passage formed outside, and a first housing forming the first portion is a shear pin. Is rotatably coupled to a second housing that constitutes a second portion, and a cylindrical valve box is provided inside the first housing, and a second valve side is provided inside the valve box. A valve body pressed by a biased spring is housed,
The valve box is connected to a refueling hose, the first housing is connected to a vapor recovery hose, and the second housing is provided with an inner cylinder portion communicating with the valve box. The inner cylinder portion is pushed to press the valve body. In the safety pipe joint in which a member is provided, an inner cylinder portion is connected to an oil supply hose, and a second housing is connected to a vapor recovery hose, a plurality of ribs extending inward in the radial direction are projected on the first housing. A safety pipe joint characterized in that a threaded portion is formed at an edge portion of the rib, and the valve box is screwed and fixed to the threaded portion.