JPH09310771A - Gas cock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the smooth operation of an overflow preventing valve by forming inclination of an inclined surface of a reset body so as to be gradually formed, restricting a depth dimension of a gas cock. SOLUTION: A valve opening side stopper 161, on which a rear end of a reset body 41 abuts when a slide cock 2 is positioned at a full-open position, is formed by an inner surface of a sealing cover 16 threaded into a back surface wall in an upstream part of a barrel part 19 of a gas cock 1. A space between the valve opening side stopper 161 and a valve closing side stopper 162 is set shorter than a moving stroke of the slide cock 2 to be operated for opening and closing. Consequently, in comparison with a case where the reset body 41 is fixed to the slide cock 2 so that it can not be moved, depth dimension of the gas cock 1 is restricted, and while length thereof in the moving direction of the reset body 41 can be increased, and inclination of an inclined surface, which is formed in a lower surface of the reset body 41, can be gradually formed. Consequently, reset operation for pushing a reset shaft 42 of an overflow preventing valve can be smoothly performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a gas plug equipped with a so-called overflow prevention valve that automatically shuts off a gas flow path when a gas flow rate abnormally increases, and enables a reset operation of the overflow prevention valve to be performed smoothly.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show a conventional gas plug disclosed in Japanese Patent Publication No. 8-10031. Inside the gas plug body (1), an inverted L-shaped gas flow path from the gas inlet (11) to the gas outlet (12) is formed, and a straight line upstream of the gas outlet (12) is formed. A slide stopper (2) is hermetically slidably accommodated in the valve chamber (13) of the valve stopper (2).
It is urged to the gas outlet (12) side on the downstream side by (111). An auxiliary valve (22) is fitted on the protruding shaft (21) at the tip of the slide plug (2), and the auxiliary valve (22) is a gas outlet.
The auxiliary valve seat opening (18) on the upstream side of (12) is opened and closed.

A reset body (41) for resetting an overflow prevention valve, which will be described later, is connected and fixed to a rear end portion which is an upstream end of the slide plug (2). On the upstream side of the slide stopper (2), a cylindrical tube body whose central axis is perpendicular to the moving direction of the slide stopper (2) and a lift valve (not shown) loaded inside the cylinder body Is provided with an overflow prevention valve (4), and a reset shaft (42) that can be advanced and retracted at the downstream end of the overflow prevention valve (4) urged in a protruding direction by an advance spring (not shown). Is provided. Further, in the vicinity of the reset shaft (42) of the overflow prevention valve (4), a spring plate (43) whose free end faces the reset shaft (42) from the tip side is provided. .

FIG. 6 shows a valve open state in which a one-touch coupling type socket (3) is externally fitted and connected to a plug portion (15) which constitutes an outer periphery of a gas outlet (12). In this valve open state, the slide stopper (2) is pushed in by the valve opening shaft (31) arranged in the center of the socket (3), whereby the rear end, which is the upstream end of the slide stopper (2). The reset body (41) connected and fixed to the portion is located further rearward than the spring plate (43) arranged above the overflow prevention valve (4).

In this state, when the gas rubber pipe on the downstream side of the socket (3) comes off and the gas flow in the gas plug increases rapidly, the overflow prevention valve (4) automatically closes in response to this. The gas flow path is forcibly shut off, which prevents the risk of being left in a raw gas release state. When the socket (3) is pulled out from the plug (15) with the overflow prevention valve (4) closed, the slide stopper (2) is pulled by the urging force of the valve closing spring (111).
Are extruded toward the gas outlet (12) on the downstream side. Then
A reset body which is continuously fixed to the rear end of the slide stopper (2)
The (41) pushes the reset shaft (42) through the spring plate (43), thereby resetting the overflow prevention valve (4) which has been closed. When the slide plug (2) is pushed further downstream by the valve closing spring (111), it enters the valve chamber (13) in an airtight outer peripheral state, while the auxiliary valve (22) opens the auxiliary valve seat ( 18)
Is closed, and the valve is closed as shown in FIG.

[0006]

However, in the above-mentioned conventional one, it is necessary to incorporate the spring plate (43) for converting the movement of the reset body (41) in the direction perpendicular to this, and yet,
At the time of assembling, it is necessary to determine the posture so that the spring plate (43) is reliably pushed by the lower end portion of the reset body (41), which causes a problem of complicating the gas stopper assembly work. .

Therefore, in order to eliminate the need for the spring plate (43), it is possible to form the lower end portion of the reset body (41) into an inverted triangular mountain shape as shown in FIG. That is, the reset body (4
1) A pair of front and rear inclined surfaces (41
1) (412) is formed, and when the slide stopper (2) moves in the valve closing direction, the inclined surface (411) of the reset body (41) pushes the reset shaft (42), which causes overflow. The reset valve (4) is reset.

However, in the above improvement, the depth dimension of the gas plug (dimension in the moving direction of the slide plug (2))
If you try to keep it constant, the inclined surface of the reset body (41)
The inclination angles of (411) and (412) cannot be set to such a gentle angle that a smooth pushing operation of the reset shaft (42) can be ensured. As a result of actually testing an improved gas stopper shown in FIG. 7 and testing the reset operation of the overflow prevention valve (4), the inclination angle of the inclined surface (411) (the inclination angle of the reset body (41) with respect to the moving direction) ) Is large, the inclined surface
In many cases, a twisting force acted on the reset shaft (42) of the overflow prevention valve (4) from (411), and it could not be pushed in smoothly.

In the above-mentioned improvement plan, the reset body (41) is connected and fixed to the rear end of the slide stopper (2), but the assembly of the slide stopper (2) and the reset body (41) as a whole. Based on the result of consideration that the length in the moving direction of the reset body (41) can be increased while suppressing the increase in the depth dimension of the gas stopper if it can be configured to expand and contract in the moving direction, the present invention provides the gas stopper. The slope of the inclined surface (411) of the reset body (41) can be made gentle while suppressing an increase in the depth dimension of the reset body (41) to ensure a smooth reset operation of the overflow prevention valve (4).

That is, the invention of the present application is "a valve chamber extending linearly.
(13), a slide stopper that reciprocates between a valve closed position that has entered the valve chamber (13) and an valve open position that has escaped further rearward from the rear end that is the upstream end of the valve chamber (13). (2) is connected to the rear end of the slide stopper (2), which is the upstream end, and is connected to the valve chamber (1
The reset body (41) that moves in the space behind the upstream end of (3), and the reset body (41) that is provided in the gas flow path that continues to the upstream side of the moving region of the reset body (41). Four
The slide stopper (2) is provided with an overflow prevention valve (4) having a reset shaft (42) biased by an advancing spring so as to project into this movement range in a manner substantially orthogonal to the movement trajectory of (1). ) Is closed and the reset body (41) connected to it is closed.
Performs a resetting operation of pushing the tip of the reset shaft (42) of the overflow prevention valve (4). ”Gas stopper, depth dimension of the gas stopper (dimension in the moving direction of the slide stopper (2))
It is an object of the present invention to make it possible to smoothly perform the reset operation of the overflow prevention valve (4) while suppressing the increase of

[0011]

The technical means of the invention according to claim 1 for solving the above-mentioned problems is "the reset body (41)".
Is connected to the rear end of the slide stopper (2) in a manner that the slide stopper (2) can move within a certain range in the moving direction.
The surface of the portion of the reset body (41) that comes into contact with the tip of the reset shaft (42) is gradually reset from the tip end, which is the downstream end of the reset body (41), toward the opposite rear end. When the slide plug (2) enters the valve chamber (13) at the fully closed position, the inclined surface (411) protrudes in the pushing direction of the shaft (42), and the slide body (41) is located downstream of the reset body (41). Valve side stopper (162) that abuts from the tip end
When the slide plug (2) is in the fully opened position where it has escaped from the valve chamber (13), there is a valve opening side stopper (161) that comes into contact with the reset body (41) from the rear end side which is the upstream end thereof. The distance between the valve-opening side stopper (161) and the valve-closing side stopper (162) is set smaller than the moving distance of the slide plug (2).

According to the above means, when the slide stopper (2) is moved between the fully open position and the fully closed position, the reset body (41) attached to the rear end of the slide stopper (2) which is the upstream end of the slide stopper (2) is also moved. Moving. When the slide plug (2) is at the fully open position where it has escaped from the upstream end of the valve chamber (13), the reset body (4
While 1) is pushed toward the tip side of the slide stopper (2) by the valve opening side stopper (161), the reset body (41) is pushed when the slide stopper (2) is at the fully closed position. The valve closing side stopper (162) pushes the valve to the opposite side. Then, the valve opening side stopper (161) and the valve closing side stopper (16
Since the interval of 2) is set smaller than the moving distance of the slide stopper (2), the moving distance of the reset body (41) attached to the rear end of the slide stopper (2) is smaller than that of the slide stopper (2). Therefore, in the fully open state where the slide plug (2) has escaped to the upstream side of the valve chamber (13), the reset body (41) is pushed to the tip side of the slide plug (2) by the valve opening side stopper (161). In this state, the slide plug (2) and the reset body (41) are kept in a contracted length, while the slide plug (2)
Is in the fully closed position after entering the valve chamber (13), the reset body (41) attached to the slide stopper (2) is closed by the valve closing stopper (162) on the rear end side of the slide stopper (2). It is kept pressed, that is, the entire length of the assembly of the slide stopper (2) and the reset body (41) is kept extended. Therefore, the slide stopper
As the assembly of the reset body (41) attached to the rear end of the slide body and the assembly of the reset body (41) expands and contracts as the (2) opens and closes, the slide stopper (2) is not compared with the slide cap (2).
The increase in the size of the gas plug body (1) in the moving direction of the is suppressed. That is, it is possible to increase the length of the reset body (41) in the moving direction while suppressing an increase in the depth dimension of the entire gas faucet, and thus to make the inclination of the inclined surface (411) gentle.

According to a second aspect of the present invention, "when the reset body (41) is in contact with the valve closing side stopper (162), the reset body (41) pushes the reset shaft (42) into the pushed state. In the case of "maintain", the slide plug (2) is in the closed state, unlike the one in Figs. 5 to 7 in which the reset shaft (42) is temporarily pushed in the process of the slide plug (2) closing and moving. As long as the overflow prevention valve (4) is maintained in the reset state.

[0014]

As described above, according to the invention of claim 1, since the inclination of the inclined surface (411) can be made gentle, the overflow prevention valve (4) is reset at the inclined surface (411). Axis (4
2) Pushing in the reset operation smoothly. 5 and 6
Like the conventional gas plug shown in FIG. 1, a plate spring (43) that needs to be attached in consideration of the mounting posture is unnecessary, so that the gas plug can be easily assembled.

According to the second aspect of the invention, the overflow prevention valve (4) is maintained in the reset state as long as the slide stopper (2) is closed, so that the reset shaft (42) is temporarily pushed in. The reset can be performed more reliably than the ones shown in FIGS.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. FIG. 1 shows a gas plug according to the first embodiment. In the main body (1) of the gas plug, the reverse of the gas inlet (11) formed in the connecting cylinder (191) at the lower end of the body (19) is connected to the gas outlet (12) at the tip of the plug (15). An L-shaped gas channel (10) penetrates.

The inner peripheral wall in the vicinity of the downstream end in the plug portion (15) has a conical surface-shaped auxiliary valve seat opening whose diameter shrinks toward the downstream end.
(23), and the auxiliary valve seat opening (23) is opened and closed by an auxiliary valve (22) that is in contact with this from the upstream side. The auxiliary valve (22) is provided with a shaft insertion hole (220) opened on the upstream end surface thereof, and the shaft insertion hole (220) is provided with a cylindrical slide plug (2) with a front end closed. The projecting shaft (21) is slidably inserted, and these slide plugs (2) and auxiliary valves (22)
A compression spring (222) is interposed between the heads (221) of the.

At the rear end of the slide stopper (2), the tip of a reset piece holding cylinder (25) is fitted and fixed, and the lower portion of the rear end of the reset piece holding cylinder (25) is shown in FIG. As shown in FIG. 2, the reset body (41) is slidably mounted within a certain range. That is, in the cylindrical reset piece holding cylinder (25) whose end opposite to the slide plug (2) is open, a guide recess (251) is formed in the lower part of the inner circumference of the open end, On the outer periphery of the open end of the reset piece holding cylinder (25), the guide recess (251) is formed.
Is provided with a retaining projection (252). The guide recess is a peripheral side wall of the reset piece holding cylinder (25).
In the part where (251) is formed, the reset body is
(41) is forcibly fitted. Specifically, the reset body (41) is the guide recess in the reset piece holding cylinder (25).
(251) A pair of upper and lower parallel arms that sandwich the component wall (413) (4
14) and a connecting part (415) connecting these rear ends, and the tip of the lower parallel arm (413) extends further forward than the tip of the other upper parallel arm (414). ing. or,
A certain range near the lower end of the lower parallel arm (413) is an inclined surface (411) for pushing the reset shaft (42) of the overflow prevention valve (4) described later. Then, the lower parallel arm (41
On the upper surface of the extending portion of 3), there is provided an engaging convex portion (416) that engages with the retaining protrusion (252). Therefore, the reset body (41) slides in the axial direction of the reset piece holding cylinder (25) with the rear end portion of the reset piece holding cylinder (25) sandwiched between the pair of upper and lower parallel arms (413) (414). The engaging projection (416) engages with the retaining projection (252) at one end of the sliding area of the sliding stopper (2) and the reset piece holding cylinder (2).
5) and reset body (41) are sockets as a whole
(3) It is designed to expand and contract in the pushing direction. Also, when the slide stopper (2) is in the fully closed position, the reset body (4
In this embodiment, the valve closing stopper (162) with which the front end surface of (1) abuts is constituted by the upstream opening edge of the plug (15), and the slide stopper (2) is at the fully open position. When the rear end of the reset body (41) comes into contact with the valve opening side stopper (1
In this embodiment, 61) is composed of the inner surface of the closing lid (16) screwed into the upstream rear wall of the body (19) of the gas plug (1). The distance between the valve-opening side stopper (161) and the valve-closing side stopper (162) is set shorter than the moving stroke of the slide stopper (2) that opens and closes. Therefore, as compared with the case where the reset body (41) is immovably fixed to the slide stopper (2) as shown in FIG. 7, the movement of the reset body (41) is suppressed while suppressing an increase in the depth dimension of the gas stopper. The directional length can be increased, which allows the reset body (41)
It is possible to make the slope of the sloped surface (411) formed on the lower surface of the taper gentle.

The slide stopper (2) is a coil-like valve closing valve that is interposed between the slide stopper (2) and a closing lid (16) screwed into the upper back surface of the body (19) of the gas stopper body (1). It is biased in the valve closing direction by a spring (111). The body (19) of the gas stopper body (1) is equipped with an overflow prevention valve (4), and the reset shaft (42) protruding downstream from the overflow prevention valve (4) An unillustrated advancing spring in the prevention valve (4) urges the projecting state. When the slide plug (2) is at the valve closing position, it comes into contact with the horizontal portion (417) of the reset body (41). The overflow prevention valve (4) has a known structure, and when a gas having a predetermined flow rate or more flows inside the overflow prevention valve (4), the overflow prevention valve (4) is pushed by the gas flow and Four)
The lift valve therein closes, and thereafter, when the reset shaft (42) is pushed against the advance spring, the lift valve is reset to the open state.

When the socket (3) is externally fitted to the plug portion (15) in the valve closed state of FIG. 1, the valve opening shaft (31) provided in the socket (3) is shown in FIG. Pushes the auxiliary valve (22) to open the auxiliary valve (22) and the slide stopper (2).
Next, the valve opening operation of the slide stopper (2) will be described in more detail. When the socket (3) is fitted onto the plug (15) and pushed in during the valve opening operation, the reset body (41) hits the valve opening side stopper (161) which is a constituent wall of the closing lid (16). Upon contact, the reset body (41) is no longer moved backward.
Push the socket (3) in further and the reset piece holding tube (25)
With respect to the reset body (41), the slide plug (2) and the reset piece holding cylinder (25) are further moved in such a manner that the reset body (41) slides relative to each other, whereby the slide plug (2) and the reset piece holding cylinder (25 ) And the aggregate of the reset body (41) in the moving direction is contracted, and the valve open state of FIG. 3 is maintained. In this valve open state, the slide plug (2) moves to the middle of the inflow hole (14) located in the upstream space of the valve chamber (13), and is further connected to the rear end of the slide plug (2). The reset body (41) mounted on the reset piece holding cylinder (25) is moved further rearward (in the pushing direction of the socket (3)) from the reset shaft (42) of the overflow prevention valve (4). It has become.

In this state, when the gas rubber pipe on the downstream side of the socket (3) comes off and a gas overflow state occurs, the overflow prevention valve (4) automatically closes as described above. Next, plug the socket (3) into the plug section (15) after the overflow prevention valve (4) is automatically closed.
When pulled out, the slide stopper (2) is moved in the valve closing direction by the urging force of the valve closing spring (111). Then, the inclined surface (411) of the reset body (41) comes into contact with the reset shaft (42) of the overflow prevention valve (4) that is in a protruding state, and when the reset body (41) moves further downstream from this state. , The inclined surface (41
The reset shaft (42) is gradually pushed by 1) and the overflow prevention valve (4) is maintained in the reset state. When the slide plug (2) moves to the most downstream end and the tip of the reset body (41) is in contact with the valve closing stopper (162) that is the peripheral edge of the upstream end opening of the plug (15), The reset body (41)
Is moved rearward with respect to the reset piece holding cylinder (25). In this state, the horizontal part of the reset body (41) is
(417) is kept in contact with the tip of the reset shaft (42), which keeps the reset shaft (42) pushed in (reset condition) when the slide stopper (2) is closed. Be drunk Therefore, there is an advantage that the overflow prevention valve (4) is reliably reset as compared with the one in FIG. 7 in which the overflow prevention valve (4) is temporarily reset during the process of closing the slide plug (2). is there. In this case, as described above for the above structure,
Reset body (41) while suppressing the increase in depth of the gas tap
Since the length of the moving direction of the
The inclination of the inclined surface (411) formed on the lower surface of (1) can be made gentle, which increases the inclination.
The reset shaft (42) can be pushed in more smoothly than the above.

FIG. 4 is a cross-sectional perspective view of an essential part showing a modified example of the mounting state of the reset body (41) to the reset piece holding cylinder (25). This one has a reset body (41), a ring body (4
18) and reset the ring body (418) to a reset piece holding cylinder.
It is fitted on (25) so that it can slide within a certain range. That is, the ring body (418) is provided between the cylindrical portion (27) protruding from the rear end of the slide plug (2) and the flange (254) on the rear end outer periphery of the reset piece holding cylinder (25) fitted therein. It is configured to slide. In this case, only the ring body (418) part of the reset body (41) is externally fitted to the reset piece holding cylinder (25) and is guided near the rear end of the reset piece holding cylinder (25) as shown in FIG. Since it is not necessary to form the recess (251) and the like, the structure can be simplified.

In each of the above embodiments, the slide stopper (2) and the reset piece holding cylinder (25) are formed as separate members, but they may be integrally formed.

[Brief description of drawings]

FIG. 1 is a sectional view of a gas plug in a valve closed state according to a first embodiment of the present invention.

FIG. 2 is a sectional perspective view of a mounting portion of a reset body (41) in the gas plug of FIG.

FIG. 3 is a cross-sectional view of the gas valve according to the first embodiment of the present invention in a valve open state.

FIG. 4 is a cross-sectional perspective view of an essential part showing a second embodiment showing a modified example of the mounting portion of the reset body (41) of the present invention.

FIG. 5 is a cross-sectional view showing a closed state of a conventional gas plug.

FIG. 6 is a cross-sectional view showing a valve open state of a conventional gas plug.

FIG. 7 is a sectional view of an essential part showing an improvement plan of a conventional gas plug.

[Explanation of symbols]

 (2) ・ ・ ・ Slide stopper (4) ・ ・ ・ Overflow prevention valve (13) ・ ・ ・ Valve chamber (41) ・ ・ ・ Reset body (42) ・ ・ ・ Reset shaft (161) ・ ・ ・ Open valve Side stopper (162) ・ ・ ・ Valve closing side stopper

Claims (2)

[Claims] 1. A linearly extending valve chamber (13), a valve closing position that has entered the valve chamber (13), and a rearward escape from the rear end that is the upstream end of the valve chamber (13). A slide plug (2) that reciprocates between valve opening positions, and a space that is connected to the rear end that is the upstream end of the slide plug (2) and that is behind the upstream end of the valve chamber (13). And a reset body (41) that moves in the form of a gas, which is provided in a gas flow path that is upstream of the movement region of the reset body (41) and whose tip portion is substantially orthogonal to the movement trajectory of the reset body (41). Overflow prevention valve having a reset shaft (42) biased by an advancing spring so as to project into the moving range
(4), the reset body (41) connected to the slide stopper (2) during the valve closing movement of the slide stopper (2) is connected to the reset shaft (42) of the overflow prevention valve (4). A gas stopper for performing a resetting operation of pushing in a tip, wherein the reset body (41) is movable in a certain range in a moving direction of the slide stopper (2), and the rear end of the slide stopper (2). The surface of the portion of the reset body (41) that is in contact with the tip of the reset shaft (42) has a rear end from the tip end that is the downstream end of the reset body (41). Gradually becomes the inclined surface (411) protruding in the pushing direction of the reset shaft (42), and when the slide plug (2) enters the valve chamber (13) at the fully closed position, the reset body (41) ), The stopper (162) on the valve closing side that abuts from the tip side which is its downstream end, and the slide plug (2) from the valve chamber (13). A valve opening side stopper (161) is provided which comes into contact with the reset body (41) from the rear end side which is the upstream end of the reset body (41) when in the fully opened position. Stopper (162)
The gas stopper is set to have a distance smaller than the moving distance of the slide stopper (2). 2. The reset body (41) maintains the reset shaft (42) in a pushed-in state when the reset body (41) is in contact with the valve closing side stopper (162). Gas tap.