JP2006189118A - Emergency separation pipe-joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an emergency separation pipe-joint in which separation is caused under a specified load or higher, but separation is not caused by internal pressure of a gas, the gas in a filling hose is not ejected, and a separation plug is not sprung out by the gas pressure at the time of separation. <P>SOLUTION: The emergency separation pipe-joint comprises a socket (3) in which a fixed plug (2) is attached to a pipe joint body (1), and a separation plug (4) to be inserted in the pipe joint body (1). When the separation plug (4) is inserted in the socket (3), shutoff valves (18, 32) placed respectively in the fixed plug (2) and the separation plug (4) are opened, and when the separation plug (4) is pulled out of the socket (3), the shutoff valves (18, 32) are closed. Grooves (12, 42) are graved in the inside wall-surface of the pipe joint body (1) and the outside wall-surface of the separation plug (4). An elastic ring (11) fit in the groove (12) of the pipe-joint body (1) is engaged with the groove (42) of the separation plug (4) so as to lock them separably. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an emergency detachment pipe joint used for a filling apparatus for high-pressure gas such as hydrogen gas and natural gas.

  In the high-pressure gas filling device, gas filling is performed by connecting a filling nozzle to a fuel tank of an automobile. For this reason, when the automobile moves during the filling and the filling hose is pulled, the filling nozzle, the filling hose and other devices are damaged, and the gas is ejected, resulting in a dangerous state. Therefore, an emergency release pipe joint that separates when a tensile load of a certain level or more is applied is provided in the middle of the filling device and the filling nozzle to prevent the risk of damage to the equipment.

As such an emergency disconnection pipe joint, (1) a structure that separates with a load of a certain level or more, (2) a structure that does not separate with an internal pressure of gas, (3) a structure that does not eject gas in the filling hose after separation, (4 ) It is required that the separation plug does not pop out due to gas pressure during separation.
As an emergency release pipe joint that separates with a load above a certain level, when the coil spring is compressed and contracted by a tensile load, the ball is unlocked and separated (see Patent Documents 1 and 2). Is known that breaks and is released after being released from locking by a sphere (see Patent Document 3).

However, since the load of the coil spring increases as it is compressed, the separation load also increases, making it difficult to design an emergency release pipe joint that separates with a constant load. Also, the locking pin changes its shear load due to fatigue due to wire diameter, material, and repeated load, and it is difficult to design an emergency release pipe joint that separates at a constant load, and the locking pin cannot be reused after separation. Further, when the lock is released by the sphere, the sphere may damage the pipe joint during the separation, or the sphere may be scattered and lost after the separation. Therefore, it cannot be reused.
Moreover, as an emergency detachment pipe joint that is not separated by the internal pressure of gas, a gas flow path is formed at right angles to the separation direction and the action of the gas pressure in the separation direction is balanced (see Patent Documents 1 and 2), pressure chamber A gas pressure is derived by balancing the effects of the gas pressure in the separation direction (see Patent Document 3).

Furthermore, as an emergency detachment pipe joint in which the gas in the filling hose does not spout after separation, there is known one provided with valves on both of the pipe joints to be separated (see Patent Documents 1, 2, and 3).
However, if the flow path and the O-ring intersect when the valve is closed, the O-ring may be damaged and the seal may be incomplete, and gas may leak.
And as an emergency detachment pipe joint in which the separation plug does not pop out due to gas pressure at the time of separation, in the process of separation, a gas is released from a gas release passage provided perpendicular to the separation direction (see Patent Documents 2 and 3), It has been known.
JP-A-6-278095 JP 2004-52867 A JP, 2004-293777, A Therefore, none of prior art was enough.

  The present invention is an emergency in which separation with a load above a certain level, no separation with internal pressure of gas, no gas in the filling hose is ejected after separation, and no separation plug pops out with gas pressure during separation It aims to provide a detachment pipe joint. Another object of the present invention is to provide an emergency release pipe joint that can be easily assembled and reused after separation.

  According to the present invention, the socket (3) having the fixed plug (2) attached to the pipe joint body (1) and the detachment plug (4) inserted into the pipe joint body (1) are provided. ), When the release plug (4) is inserted, the shutoff valves (18, 32) provided on the fixed plug (2) and the release plug (4) are opened. In the emergency detachment pipe joint in which the valves (18, 32) are closed, grooves (12, 42) are formed on the inner wall surface of the pipe joint body (1) and the outer wall surface of the detachment plug (4), and the pipe joint body The elastic ring (11) fitted in the groove (12) of (1) is engaged with the groove (42) of the detachable plug (4) so as to be detachably locked.

And the groove | channel (12,42) engraved in the inner wall surface of the said pipe joint main body (1) and the outer wall surface of a detachment plug (4) is two strips, and each groove | channel (12,42) has an elastic ring ( 11) is inserted, and both are detachably connected.
The elastic ring (11) is a ring-shaped oblique coil spring.
Further, the release plug (4) is formed with a taper (41) that pushes the elastic ring (11).

  The pipe joint body (1) is provided with a flow path (7) having an inflow path (5) and an outflow path (6) on the inner wall surface, and a shutoff valve (18) of the fixed plug (2). ) Has valve rods (19, 20) of the same diameter before and after the valve body, the front valve rod (19) is inserted into the valve rod guide (21), and the rear valve rod (20) is the valve rod. Inserted into the chamber (23), the outflow passages (26, 27) of the shutoff valve (18) are connected to the inflow passage (5) of the pipe fitting body (1), and the shutoff valve (4) of the release plug (4) 32) also has valve rods (33, 34) of the same diameter before and after the valve body, the front valve rod (33) is inserted into the valve rod guide (34), and the rear valve rod (34) is the valve Inserted into the dredge chamber (36), the inflow path (39, 40) of the shut-off valve (32) is connected to the outflow path (6) of the pipe fitting body (1), and the double valve dredge guides (21, 34) From And the shut-off valves (18, 32) are opened by contact of the ejected valve rods (19, 33), the valve plug chambers (23, 36) of the fixed plug (2) and the release plug (4), and The contact portions of both valve rods (19, 33) communicate with the atmosphere through holes (13, 16, 14) formed in the pipe joint body (1).

(1) Since the release plug is locked to the socket by the elastic ring fitted in the groove, the separation load is easily fixed, and reassembly after separation is easy.
(2) Since the valve rods before and after the shut-off valve have the same diameter and both ends of the valve rod communicate with the atmosphere, the valve closing force can be managed only by the coil spring without being affected by the internal pressure when the valve is closed after separation. .
(3) The separation mechanism that separates the detachment plug from the socket allows the gas in the flow path to be surely extracted through the hole formed in the fitting body, and there is no risk of the detachment plug popping out. .
(4) Since the elastic ring is pushed out by the taper of the outer wall surface of the separation plug, the plug including the elastic ring can be inserted with a load lower than the separation load.

As shown in FIG. 1, the emergency disconnection pipe joint of the present invention includes a socket 3 having a fixed plug 2 attached to the rear end (the downstream side of the fluid flow) of a generally cylindrical pipe joint body 1, and a pipe. It is composed of a detachment plug 4 attached to the tip of the joint body 1, and the fixed plug 2 of the socket 3 is connected to a filling device via a filling hose (not shown), and the detachment plug 4 is filled via a filling hose (not shown). Nozzle is connected.
The pipe joint body 1 is formed with an axial flow path 7 to which an inflow path 5 and an outflow path 6 are connected toward the inner wall, and the rear end of the flow path 7 is closed with a bolt 8. A screw 9 for attaching the fixed plug 2 is engraved at the rear end of the pipe joint body 1, and a notch 10 into which a pin 45 implanted in the release plug 4 is fitted is engraved at the tip, and the inner wall surface is engraved. Two grooves 12 into which the elastic ring 11 for locking the detaching plug 4 is fitted are formed.

As shown in FIG. 2, a slant winding coil spring is suitable as the elastic ring 11, but a normal coil spring or a C-shaped elastic ring may be used.
As shown in the figure, the pipe joint body 1 has four holes penetrating from the outer wall surface to the inner wall surface, and the first hole 13 provided at the rear end of the pipe joint body 1 is a valve rod of the fixed plug 2. The room is at atmospheric pressure. A second hole 14 provided in the middle of the pipe joint main body 1 is used for venting the gas in the flow path 7 during separation, as will be described later, by bringing the contact portions of the fixing and detaching plugs 2 and 4 to atmospheric pressure. . The third hole 15 provided on the distal end side of the pipe joint main body 1 is for venting the gas from the inflow side of the shutoff valve of the separation plug 4 and the flow path 7 during the separation. A fourth hole 16 provided further to the distal end side of the fitting body 1 than the third hole 15 brings the valve chamber of the separation plug 4 to atmospheric pressure, and the gas on the inflow side of the shutoff valve of the separation plug 4 during the separation. It is for unplugging.
Further, when the O-ring OR1 is broken, the hole 14 draws the gas flowing into the chamber R from the gas flow path and maintains the atmospheric pressure.

The shutoff valve 18 provided in the plug body 17 of the fixed plug 2 has valve rods 19 and 20 of the same diameter extending in the axial direction on the front side and the rear side, and is urged to close the valve seat 25 by a spring 24. Yes. The front valve rod 19 is slidably inserted into the valve rod guide 21, the valve rod guide 21 is fixed to the plug body 17 with a nut 22, and the rear valve rod 20 is a valve provided behind the plug body 17. It is slidably stored in the tub chamber 23.
Outlet passages 26, 27 of the shutoff valve 18 are formed in the valve rod guide 21 and the plug body 17 so as to extend radially outward. The outflow passages 26, 27 are formed in the inflow passage 5 formed in the pipe joint body 1. It communicates with the flow path 7 via.
At the rear end of the plug body 17, a screw 28 that is screwed into the screw 9 of the pipe joint body 1 is engraved, and a mounting nut 29 to which a filling hose (not shown) is attached is screwed.

Further, the plug body 17 is provided with a hole 30 communicating with the valve housing 23, and the valve housing 23 is brought to atmospheric pressure by the hole 30 and the first hole 13 formed in the pipe body 1. ing.
The shutoff valve 32 provided in the plug body 31 of the detachment plug 4 has substantially the same configuration as the shutoff valve 18. Valve rods 33 and 34 having the same diameter extending in the axial direction are provided on the front side and the rear side, and the valve seat 38 is urged to close by a spring 37. The front valve rod 33 is slidably inserted into the valve rod guide 34 a, the valve rod guide 34 a is fixed to the plug body 31 with a nut 35, and the rear valve rod 34 is a valve rod provided on the plug body 31. The chamber 36 is slidably accommodated.
The plug body 31 and the valve rod guide 34a are formed with inflow passages 39, 40 of the shut-off valve 32 extending in the radial direction, and the inflow passages 39, 40 are flow paths through the outflow passage 6 formed in the pipe joint body 1. 7 is communicated.

A taper 41 is formed on the outer wall surface of the plug body 31 to push the elastic ring 11 provided in the pipe joint body 1, and two grooves 42 that are engaged with the elastic ring 11 are formed, and the rear end is filled. A hose attachment nut 43 is screwed together.
Further, the plug body 31 is provided with a hole 44 communicating with the valve housing 36, and the valve housing 36 is brought to atmospheric pressure by the hole 44 and the fourth hole 16 formed in the pipe joint body 1. ing.
In addition, the code | symbol 45 in a figure is a pin engaged with the notch 10 of the pipe joint main body 1, and code | symbol OR is an O ring for sealing.

At the time of assembly, the emergency detachment pipe joint of the present invention is configured by assembling the socket 3 by screwing the fixing plug 2 into the pipe joint body 1 and inserting the detachment plug 4 into the pipe joint body 1.
When the screw 9 of the fixed plug 2 is screwed into the screw 9 of the pipe joint body 1 and assembled, the outflow path 27 of the fixed plug 2 communicates with the flow path 7 via the inflow path 5 of the pipe joint body 1. The chamber 23 communicates with the atmosphere via the holes 30 and 13, and the distal end portion of the fixed plug 2 communicates with the atmosphere via the hole 14.
When the release plug 4 is inserted into the pipe joint body 1, the taper 41 of the release plug 4 is inserted by expanding the elastic ring 11, and the elastic ring 11 engages with the groove 42 of the release plug 4 so that the release plug 4 is connected to the pipe joint. Locked to the main body 1, the pin 45 fits into the notch 10.

In a state where the elastic ring 11 is engaged with the groove 42, the valve rod 19 of the fixed plug 2 and the valve rod 33 of the release plug 4 come into contact with each other, and both the shutoff valves 18 and 32 are opened. Further, the inflow path 39 of the detachment plug 4 communicates with the flow path 7 through the outflow path 6 of the pipe body 1, the valve chamber 36 communicates with the atmosphere through the holes 44, 16, and the valve rods 19, 33. The contact portion communicates with the atmosphere through the hole 14.
And the rotation of the detachment plug 4 is prevented by the pin 45 fitted in the notch 10, and damage to the O-ring OR is prevented.
In operation, the gas that has flowed into the fixed plug 2 of the socket 3 from the filling hose through the emergency disconnection pipe joint flows from the plug body 17 into the flow path 7 of the pipe joint body 1 through the outflow paths 26 and 27, and flows into the flow path 39. , 40 flows into the plug main body 31 of the separation plug 4 and flows out from the separation plug 4 to the filling hose.

In this state, when the filling hose, that is, the detaching plug 4 is pulled with a certain force, the elastic ring 11 is unlocked, the detaching plug 4 comes out of the fitting body 1 of the socket 3, and the valve rod 19 33 are released, the shut-off valves 18 and 32 are closed, and gas outflow is prevented (FIG. 3).
When the detachment plug 4 further comes out of the pipe joint body 1, the inflow path 39 of the detachment plug 4 and the flow path 7 of the pipe joint body 1 communicate with the hole 15 of the pipe joint body 1, and the inflow paths 39, 40, and the flow path 7 is extracted, and separation promotion by gas pressure is prevented (FIG. 4).

When the detachment plug 4 further comes out of the pipe joint body 1, the inflow passage 39 of the detachment plug 4 communicates with the hole 16 of the pipe joint body 1, and the gas that could not be removed through the hole 15 is extracted, thereby further promoting separation by gas pressure. Is prevented (FIG. 5).
When the detachment plug 4 further comes out of the pipe joint body 1, the flow path 7 of the pipe joint body 1 communicates with the hole 14 of the pipe joint body 1, and the gas that could not be removed through the hole 15 is extracted, thereby promoting separation by gas pressure. It is further prevented.

Then, the detachment plug 4 is completely removed from the pipe joint body 1 (FIG. 6). Thus, after the gas pressure is released from the holes 14, 15, 16, the detachment plug 4 is released from the pipe joint body 1, so that the separation plug 4 does not jump out due to the gas pressure.
When the detachment plug 4 is detached from the socket 3, it can be used again by inserting the detachment plug 4 into the pipe joint body 1 after confirming safety.

  An emergency detachment fitting that separates with a load above a certain level, does not separate with the internal pressure of the gas, does not blow out the gas in the filling hose after separation, and does not cause the separation plug to pop out due to the gas pressure during separation. Therefore, a safe high-pressure gas filling device can be provided.

Sectional drawing of the emergency detachment pipe joint of this invention. The top view of an elastic ring. Sectional drawing of the state in which the shut-off valve was closed at the initial stage of detachment of the emergency detachment fitting. Sectional drawing of the state which detachment | desorption progresses and the degassing of the flow path is performed. Sectional drawing of the state which detachment | desorption progresses and the degassing of the flow path is performed. Sectional drawing of the state which the emergency detachment pipe joint removed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Pipe fitting main body 2 ... Fixed plug 3 ... Socket 4 ... Separation plug 5 ... Inflow path 6 ... Outflow path 7 ... Flow path 8 ... Bolt 9, 28 ... Screw 10 ... Notch 11 ... Elastic ring 12, 42 ... Groove 13, 14, 15, 16 ... Hole 17, 31 ... Plug body 18, 32 ... Shut-off valve 19, 20, 33, 34 ... Valve 21, 34 ... Valve guide 22, 22, ... Nut 23, 36 ... Valve chamber 24, 37 ... Spring 25, 38 ... Valve seat 26, 27 ... Outflow passage 29, 43 ... Mounting nut 30, 44 ... Hole 39, 40 ... Inflow passage 41 ... Taper 45 ... Pin OR ... O-ring

Claims (5)

Consists of a socket with a fixed plug attached to the fitting body and a detachment plug inserted into the fitting body. When the detachment plug is inserted into the socket, the shut-off valve provided on the fixing plug and the detachment plug opens and detaches from the socket. In emergency release fittings that both shut off when the plug comes off,
A groove is engraved on the inner wall surface of the fitting body and the outer wall surface of the detachment plug, and the elastic ring fitted in the groove of the fitting body is engaged with the groove of the detachment plug so that both can be detachably locked. And emergency release fittings.   2. The emergency detachment according to claim 1, wherein two grooves are formed on the inner wall of the pipe joint body and the outer wall of the detachment plug, and an elastic ring is fitted in each groove, and both are detachably connected. Pipe fittings.   The emergency release pipe joint according to claim 1 or 2, wherein the elastic ring is a ring-shaped oblique winding coil spring.   The emergency disconnection pipe joint according to any one of claims 1 to 3, wherein a taper that spreads the elastic ring is formed on an outer wall surface of the release plug.   The pipe joint body is provided with a flow path having an inflow path and an outflow path on the inner wall surface, and the shutoff valve of the fixed plug has valve rods of the same diameter before and after the valve body, Is inserted into the valve rod guide, the rear valve rod is inserted into the valve chamber, the shutoff valve outflow passage is connected to the inflow passage of the fitting body, and the shutoff valve of the release plug is also connected to the front and rear of the valve disc. The front valve rod is inserted into the valve rod guide, the rear valve rod is inserted into the valve chamber, and the inflow passage of the shut-off valve is connected to the outflow passage of the fitting body. The valve rods protruding from both valve rod guides come into contact with each other to open both shut-off valves. The valve plug chambers of the fixed plug and release plug, and the contact portions of both valve rods are opened in the pipe joint body. The emergency release pipe joint according to any one of claims 1 to 4, wherein the emergency release pipe joint is communicated with the atmosphere through a hole.

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