JPH072696U - Pipe fitting - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a pipe joint in which a socket and a plug are easily separated from each other when an external force is applied in the radial direction. [Structure] On an outer peripheral surface of a socket 1, chucks 4 projecting from an end portion on a plug insertion side and having a projection locking portion 18b at a tip end portion thereof are provided at three positions at intervals of 120 degrees, and a plug 20 is provided. When inserted, the annular projection 22 provided on the outer peripheral surface of the plug 20 is fitted between the projection locking portion 18b and the end portion of the socket 1 on the plug insertion side, so that the socket 1 and the plug 20 are connected. While the connection state is maintained, the outer peripheral surface of the one end portion on the insertion side of the plug 20 and a part of the inner peripheral surface of the socket 1 are formed of the same spherical surface to maintain a close engagement state between them, and High airtightness is obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint for a conduit for transferring a fluid such as gasoline or light oil in a gas station, and more particularly to a pipe joint having an improved connection mechanism and emergency disconnection mechanism.

[0002]

[Prior art and its problems]

 Conventionally, as a pipe joint of this type, for example, as disclosed in Japanese Utility Model Publication No. 62-37037, when an external force of a predetermined value or more acts in the axial direction of the pipe joint, the socket and the plug are immediately connected. It is publicly known that the valve bodies provided inside the both are closed to prevent the fluid and the like from flowing out while being separated.

However, from the positional relationship between the stand and the vehicle at the gas station, it has been found that an abnormal external force acts in the radial direction rather than the axial direction when the pipe joint is used. With respect to such a force acting from the radial direction, no structural consideration is given to immediately release the connected state. Therefore, in the above conventional pipe joint, the connection state is broken or the flow of fluid to the outside is broken due to the force from the radial direction without closing the valve bodies in which the socket and the plug are provided inside. There is a fear of coming out.

[0004]

[The purpose of the device]

 The present invention has been made in view of the above problems, and an object thereof is to provide a pipe joint in which a socket and a plug can be easily separated from each other by an external force from a radial direction.

[0005]

[Constitution of device]

 In the pipe joint according to the present invention, the outer peripheral surface of the tip of the plug inserted into the socket and the inner peripheral surface of the plug insertion portion of the socket are formed into substantially the same spherical surface, and the plug is inserted into the socket. At this time, a locking portion that engages with a plug holding member provided on the outer peripheral portion of the socket is provided at one end of the outer peripheral surface of the plug.

Here, the plug holding member is preferably made of an elastic body.

[0007]

[Action]

 When the plug is inserted into the socket, the plug is inserted into the socket until the protrusion protruding from the outer peripheral surface hits the end of the socket, and at the same time the protrusion hits the end of the socket, part of the protrusion Is fitted between the engaging portion protruding from the plug holding member and the end portion of the socket, and the connection state between the socket and the plug is maintained. Further, since the engagement surfaces of the socket and the plug are formed of substantially the same spherical surface, it is possible to maintain a close engagement state and sufficiently maintain the airtightness inside the pipe joint.

In the connected state of the socket and the plug, when an external force is applied to the plug or the socket in the radial direction, the plug holding member bends to fit between the locking portion of the plug holding member and the end portion of the socket. The projection on the outer peripheral surface of the plug that was previously released is released from the fitted state, and the socket and the plug can be separated without damaging the pipe joint.

[0009]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional side view of an essential part showing an embodiment of a pipe joint according to the present invention. FIG. 1 (a) is a vertical sectional side view of a half of a socket, and FIG. 1 (b) is a plug. 4 is a longitudinal side view of the four half section, FIG. 2 is a vertical side view of the four half section showing the state where the socket and the plug in the embodiment shown in FIG. 1 are connected, and FIG. FIG. 5 is a vertical sectional side view of a four-half part in a state where an external force is applied.

First, referring to FIG. 1 (a), a socket constituting a pipe joint according to the present invention will be described. In the following description, a side where a socket and a plug are connected is a front part, a front part, It is called the front end, and the side where the socket or plug is connected to the pipe is called the rear, rear, or rear end.

The socket 1 includes a socket main cylinder 2, a socket valve 3 provided inside the socket main cylinder 2, and three plug holding members provided on the outer peripheral surface of the socket main cylinder 2. The chuck 4, a sleeve spring 5 for holding the chuck 4, and a collar 6 are main components.

An annular spring receiving portion 7 is projectingly formed at a rear position inside the socket main cylinder 2 having a flow passage 30 in the axial direction, and a spring engaging portion formed in a socket valve 3 described later. A valve spring 8 is mounted between the valve spring 8 and the valve spring 12. Further, a valve seat 9 is formed in the front part inside the main socket 2 of the socket, and the vicinity of the valve seat 9 is formed such that the inner diameter thereof gradually decreases in the axial direction of the main socket 2 of the socket. The vertical cross-sectional shape tapers toward the central axis of the socket main barrel 2.

An annular recess 10 is formed on the inner peripheral surface of the front end portion of the main socket body 2 for retaining the internal airtightness when the socket 1 and the plug 20 are connected. The O-ring 11 of is buried. The inner peripheral surface of the socket main cylinder 2 extending from the portion where the recess 10 is formed to the rear valve seat 9 forms a part of a concave spherical surface, and this spherical surface 15a forms a front end of the plug 20 described later. It is substantially coincident with the spherical surface 15b forming the outer peripheral surface of the portion, and when the plug 20 is connected, the spherical surfaces 15a and 15b come into close contact with each other.

The socket valve 3 is composed of a conical portion 3a and a wing-shaped portion 3b provided on the bottom side of the conical body. The conical portion 3a is located behind the main socket 2 of the socket. The valve seat 8 is seated by a valve spring 8 elastically mounted between a spring locking portion 12 formed on the socket valve 3 and a spring receiving portion 7 so as to face the end portion side. Therefore, in the separated state, the flow passage 30 formed inside the socket main cylinder 2 is blocked by the socket valve 3 seated on the valve seat 9.

On the other hand, a collar 6 is provided on the outer peripheral surface of the socket main cylinder 2 in the vicinity of substantially the center in the axial direction. The collar 6 has a flange portion 6a formed in the radial direction on the rear end surface side of a short tubular member having an inner diameter larger than the outer diameter of the socket main tubular body 2, and the flange portion 6a has a socket 6a. An insertion hole having a diameter slightly larger than the outer diameter of the main cylinder 2 is formed, and the socket main cylinder 2 is inserted into this insertion hole.

The collar 6 is equal to the thickness of the locking projection 13 provided on the outer peripheral surface of the socket main cylindrical body 2 in an annular shape, and the flange portion 6 a of the collar 6 from the locking projection 13 to the rear end side. The flange 6a is sandwiched between the stop ring 14 and the stop ring 14 provided at a distance from each other to restrict the axial movement of the main socket body 2 of the socket, while allowing only the circumferential rotation. Has become. The stop ring 14 is embedded in an annular groove formed in an annular shape on the outer peripheral surface of the socket main cylinder 2.

The chuck 4 according to the present embodiment has a rectangular side surface, and is provided at three locations on the outer circumference of the socket main cylinder 2 at 120 ° intervals. Moreover, the longitudinal cross-sectional shape is a shape in which two flat plate portions 4a and 4b are bent by a step portion 16 in the vicinity of substantially the center in the longitudinal axis direction, and the chuck 4 has a rear flat plate portion 4a. It is fixed to the outer peripheral surface of the socket main cylindrical body 2 by a spring pin 17 in the vicinity of the approximate center.

Further, at both ends of the chuck 4 in the longitudinal axis direction, the projection locking portions 18a and 18b are arranged in the same direction (in FIG. It is projectingly provided in a hook shape in the central axis direction of the cylindrical body 2. Of the two protrusion locking portions 18a and 18b, the rear protrusion locking portion 18a is adapted to fit into a locking recess 19 formed on the outer peripheral surface of the socket main barrel 2. The locking projection 13 is just clamped between the locking recess 19 and the front end of the collar 6 extending so as to surround the locking recess 19.

On the other hand, the protrusion locking portion 18 b on the front side of the chuck 4 further protrudes from the front end portion of the socket main barrel 2. A sleeve spring 5 is mounted between the step portion 16 of the chuck 4 and the front end portion of the collar 6 so that the three chucks 4 can be held on the outer peripheral surface of the socket main barrel 2. Has become.

Next, the plug 20 will be described with reference to FIG. The plug 20 having the flow path 31 in the axial direction has, on the outer peripheral surface of the front end portion thereof, a radius of curvature substantially the same as the radius of curvature of the spherical surface 15a forming the inner peripheral surface of the front end portion of the socket main cylinder 2 described above. The spherical surface 15b has a convex spherical surface 15b of the plug 20 and the socket main cylindrical body 2 when the plug 20 is connected to the socket main cylindrical body 2 or when the socket main cylindrical body 2 is disconnected in an emergency as described later. It can slide smoothly while engaging with the concave spherical surface 15a.

Inside the plug 20, a plug valve 23 having the same structure as the socket valve 3 housed in the socket main cylinder 2 is provided with a spring engaging portion 24 and a spring receiving portion 21. It is urged forward by a valve spring 8 mounted elastically between the two and seated on a valve seat 25 formed at the front end of the inner peripheral surface of the plug 20. The wing-shaped portion 3b of the plug valve 23 can be projected from the front end portion of the plug 20 to the outside. In this state, the flow passage 31 inside the plug 20 is located on the front end portion side of the plug 20 by the plug valve 23. It is cut off from the outside.

An annular projection 22 having a taper 22a on the front surface is formed so as to project from the outer peripheral surface of the plug 20, and the annular projection 22 connects the plug 20 and the socket main barrel 2 to each other. At this time, it is provided so as to project between the front end portion of the socket main barrel 2 and the front projection locking portion 18b of the chuck 4.

Next, the operation of connecting the socket 1 and the plug 20 described above will be described. First, the plug 20 and the socket 1 are made to face each other as shown in FIG. 1, and the front end of the plug 20 is inserted into the front end of the socket 1. The wing-shaped portions 3b and 3b of the socket valve 3 and the plug valve 23 come into contact with each other, and as the plug 20 enters, the socket valve 3 and the plug valve 23 gradually withdraw against the respective valve springs 8. Will be done.

Subsequently, when the tapered surface 22a of the annular projection 22 abuts on the tapered surface 18c of the projection locking portion 18b and the projection locking portion 18b is expanded to the outside, the plug 20 is further advanced. The annular protrusion 22 of the plug 20 is fitted between the front end portion of the socket 1 and the protrusion locking portion 18b of the chuck 4. In this way, as shown in FIG. 2, the connection between the socket 1 and the plug 20 is completed, and the flow path 30 of the socket 1 and the flow path 31 of the plug 20 are in communication with each other. At this time, the convex spherical surface 15b is substantially joined to the concave spherical surface 15a of the socket main barrel 2, and the O-ring 11 is sandwiched between the inner and outer peripheral surfaces of the socket main body 2 to maintain airtightness between the flow passages 30 and 31 and the outside. To be done.

Next, with reference to FIG. 3, an explanation will be given of the action when an external force acts from the radial direction of the pipe joint in the connected state of the socket 1 and the plug 20. First, as a premise, when the socket 1 is fixed so as not to move in the radial direction and the thrust direction, as shown by the white arrow in FIG. 3, an external force in the radial direction acts on the plug 20 from top to bottom. To do. Under such a premise, the plug 20 acts so that the annular projection 22 slightly pushes up the chuck 4 while the rear end side of the plug 20 is tilted downward in FIG. As a result, the annular protrusion 22 is released from the fitted state.

As shown in FIG. 3, in a state in which the plug 20 is not completely separated from the socket 1, the convex spherical surface 15 b of the plug 20 slides on the concave spherical surface 15 a of the socket main cylinder body 2. Move to the rear of the plug 20. Even during this movement, the O-ring 11 is in contact with the convex spherical surface 15b, so that the sealed state between the inner and outer peripheral surfaces of the socket 1 and the plug 20 is maintained. The flow passages 30 and 31 do not communicate with the outside until the socket valve 3 and the plug valve 23 are seated on the valve seats 9 and 25, respectively. That is, before the plug 20 is detached from the socket 1, the socket valve 3 and the plug valve 23 are seated on the respective valve seats 9 and 25, the communication state of the flow passages 30 and 31 is cut off, and thereafter, The plug 20 and the socket 1 are separated.

In this embodiment, the chuck 4 is held on the outer peripheral surface of the socket main barrel 2 with some play in the radial direction of the socket 1. The sleeve spring 5 is mounted on the outer peripheral surface of the socket main body 2 by the spring pin 17, and the sleeve spring 5 is externally mounted. However, the sleeve spring 5 is not limited to the one in this embodiment. It is sufficient that the chuck 4 and the socket main barrel 2 are made of an elastic member and integrally fastened.

Further, in the present embodiment, the chucks 4 as the plug holding members are provided at three locations on the outer peripheral surface of the socket 1, but the number thereof is not limited to that of the present embodiment. From the viewpoint of obtaining a stable plug holding state with the number as small as possible, three plugs are preferable.

[0029]

[Effect of device]

 In the pipe joint of the present invention, the plug to be inserted into the socket is configured to be held at a plurality of positions on the outer peripheral surface thereof, so that the connection between the socket and the plug can be easily performed when an external force in the radial direction is applied. Unlike the conventional case, when external force is applied from the radial direction, the socket and plug will not be easily released from the connection state, and damage will not occur, and also in the axial direction of the pipe joint. As in the conventional case, it is possible to easily release the connected state.

Further, by forming the connecting portion between the socket and the plug by a part of the spherical surface, respectively, it is possible to keep the socket and the plug in a substantially engaged state until just before they are separated from each other. Since the airtightness of the pipe can be improved, it can be applied to various fields as a pipe joint equipped with a reliable separation mechanism in an emergency.

[Brief description of drawings]

FIG. 1 shows a separated state of a pipe joint according to the present invention,
FIG. 3A is a side view of the socket in the vertical section, and FIG. 3B is a side view in the vertical section of the plug.

FIG. 2 is a vertical sectional side view of a four-half portion in a connected state of the pipe joint shown in FIG.

3 is a four-half longitudinal sectional side view for explaining an operation when an external force in a radial direction acts on the pipe joint shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 socket 2 socket main cylinder 4 chuck as a holding member 5 sleeve spring 6 collar 11 O-ring 15a concave spherical surface 15b convex spherical surface 17 spring pin 20 plug 22 annular projection

Claims (2)

[Scope of utility model registration request] 1. A tip outer peripheral surface of a plug to be inserted into a socket and an inner peripheral surface of a plug insertion portion of the socket are formed into substantially the same spherical surface, and when the plug is inserted into the socket, A pipe joint characterized in that a locking portion that engages with a plug holding member provided on an outer peripheral portion is provided on one end of the outer peripheral surface of the plug. 2. The pipe joint according to claim 1, wherein the plug holding member is formed of an elastic body.