JP2542516Y2 - Gas tap with emergency shut-off valve - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a gas stopper with an emergency shut-off valve, particularly an emergency shut-off valve of a type that is closed by an output of a detecting means such as a gas alarm, on the downstream side of the plug. The present invention relates to a built-in gas stopper with an emergency shutoff valve.

[0002]

2. Description of the Related Art As an emergency shut-off valve, an emergency shut-off valve linked to a gas leak alarm has become widespread, and recently, there are many types in which the emergency shut-off valve (hereinafter simply referred to as a shut-off valve) is built in a gas stopper. Proposed. In this case, when there is a gas leak or the like, the gas leak alarm device is activated, and the shutoff valve is closed by the output from the alarm device. At this point, since the gas plug is in the open state, the gas plug can be closed to repair a gas leak point on the downstream side of the gas plug. At the time of the above repair, it does not matter much where the shutoff valve is located with respect to the plug of the gas stopper. However, in order to facilitate maintenance and inspection of the shutoff valve itself, the shutoff valve must be connected to the gas stopper. , It is desirable to be on the downstream side of the plug. This is because maintenance and inspection of the shut-off valve located on the downstream side can be performed with the stopper closed.

[0003] Japanese Unexamined Utility Model Publication No. 63-182374 discloses a device that satisfies such a demand. In this device, as shown in FIG. The shutoff valve (2) is inserted downstream of (11). Therefore, if the plug (11) is closed, there is no fear of gas leakage or the like even if these parts are disassembled during repair and inspection of the gas circuit on the downstream side. Further, in this prior art, when the downstream circuit is restored to a normal state after the shut-off valve (2) is activated by the output of the gas leak alarm (4), the shut-off valve (2) is opened. Can be restored. The reciprocating shaft (3) faces the valve body (20) of the shutoff valve (2).
0) is provided, and the operation section of the reciprocating shaft (30) protrudes outside.
When 0) is pressed, the valve element (20) is set to the valve open state.

However, in this prior art, the valve element (2)
When resetting the valve (0) to the open state, the plug (11)
In addition to the above operation, a special operation for resetting is required. Therefore, if this operation is forgotten, there is no danger, but no gas is supplied downstream of the shut-off valve (2). In particular, as in the prior art, when the operation unit of the reciprocating shaft (30) is extremely small, a general consumer tends to forget to operate the operation unit. In some cases, even the necessity of this operation is often unknown to the consumer. The present invention has been made in view of such a point,
"A shut-off valve (2) of a type that is automatically closed by a signal input is built in the gas plug body (1) downstream of the plug (11), and the shut-off valve (2) has a valve (20). A gas plug with an emergency shut-off valve having a reset mechanism (3) for resetting the valve body (20) to the initial position, wherein the valve is reset to the open state when forcibly returned to the initial position. An object of the present invention is to prevent forgetting to operate the reset mechanism (3) after the operation of the valve (2) and to simplify the operation of the reset mechanism (3).

[0005]

The technical means of the present invention for solving the above-mentioned problem is as follows: "The plug (11) is a rotary plug, and the cylinder (32) which moves forward and backward in conjunction with the plug (11). ) With the plug (1
1) is housed in a circuit on the downstream side in an outer peripheral airtight state, and a valve seat (33) is provided at a downstream end of the cylindrical body (32).
The valve body (20) of the shut-off valve (2) is disposed so as to face 3), and the interlocking relationship between the plug (11) and the cylinder (32) is as follows.
In the fully closed position of the plug (11), the valve seat (33) advances toward the valve (20) and coincides with the initial position of the valve (20), and in the fully opened position of the plug (11). The position is set at a distance from the initial position by a certain distance. "

[0006]

The above technical means operates as follows. When the shut-off valve (2) does not operate and the plug (11) is in the fully opened state, the circuit to the downstream side of the plug (11) is because the shut-off valve (2) is in the open state. Gas is supplied from the valve seat (33) to the downstream side through the inside of the cylindrical body (32). When this signal is actuated by the signal of the shut-off valve (2), the valve body (20) comes into contact with the valve seat (33) of the cylindrical body (32). Body (2
0). That is, the circuit in the gas plug main body (1) is shut off by the operation of the shut-off valve (2). In this state, when the plug (11) is rotated to the fully closed position, the plug (11) and the cylindrical body (32) are in a predetermined interlocking relationship, so that the plug (11) comes into contact with the valve seat (33). The returned valve element (20) is returned to the initial position. Therefore, in this state, the gas circuit in the gas plug main body (1) is shut off and the valve body (20)
Is reset.

[0007]

When the stopper (11) is rotated to the fully closed position, the valve (20) is automatically reset, so that the valve (20) is not forgotten to be reset unlike the related art. In addition, plug body (1
Since a special reset operation other than the operation 1) is not required, the reset operation is simple. In addition, since the reset operation of the valve element (20) is performed by the operating portion inside the gas circuit, the provision of the reset mechanism does not increase the number of gas leakage points in the gas plug main body (1).

[0008]

Next, an embodiment of the above-mentioned wooden device will be described in detail with reference to the drawings. The embodiment shown in FIGS. 1 to 5 has a shut-off valve (2) built in a so-called box cock accommodating a gas plug in a box (B), and is provided at a downstream end of a gas plug body (1). The valve body (20) of the shut-off valve (2) is arranged on the upstream side of the hose end (H). As shown in FIG. 1, the gas stopper main body (1) has a straight gas passage (10) formed from the gas inlet to the upstream end of the hose end (H). The plug (11) is inserted in the middle of 10), and the downstream side thereof is the cylindrical body (3).
An empty room (14) for accommodating 2). The length of the chamber (14) in the axial direction is set to be longer than that of the cylindrical body (32), and the valve body (20) provided at the downstream end of the chamber (14) has its axial line. It is arranged in a posture facing at a right angle to.

In this embodiment, the cylinder (32) also serves as a cylinder of an overflow prevention valve, and a ball valve (36) is housed in the cylinder (32). This ball valve (36)
Of the valve seat (3) formed at the downstream end of the cylindrical body (32).
3) The diameter of the mouth (37) is set slightly larger than the diameter of the mouth (37), and the mouth (37) is a tapered portion that expands toward the upstream side. The valve (36) is moved downstream and the port (37)
To cut off the circuit in the cylinder (32). In the embodiment, the gas stopper main body (1) is installed so that the axis of the gas flow path (10) is in the vertical direction. Therefore, the cylinder (3
The ball valve (36) in 2) is normally a cylinder (3
2), and is constantly urged upstream by its own weight. From this, when the amount of gas passing through the cylinder (32) exceeds the set value, the gas flow causes the ball valve (36) to move upward and operate as described above.

At the upstream end of the cylindrical body (32), a shaft (3)
4) protrudes, and this is opposed to the cam portion (12) formed on the body of the plug (11). And vacancy (14)
A spring (35) for urging the cylindrical body (32) to the upstream side is interposed between the downstream end wall and the constituent wall. The cam section (1
2) As shown in FIG. 2 and FIG. 4, an arc shape extends from the downstream edge of the passage hole (13) of the plug (11) to the circumference of the surface of the plug (11) over a certain range. When the cylindrical body (32) is located at the most upstream end, the shaft portion (34) projects at a position corresponding to the formation portion of the cam portion (12). Therefore, when the plug (11) is fully opened as shown in FIGS. 3 to 5, the shaft portion (34) is not in contact with the cam portion (12), and the passage hole (13).
The cylindrical body (32) is set at the most upstream end position of the empty chamber (14) by the urging force of the spring (35). When the plug (11) is rotated from this state to the fully closed state, the cam (12) and the shaft (34) are paired, and the cylinder (32) is biased by the spring (35). Is moved a certain stroke downstream. Thus, the valve body (20) is driven by the combination of the cam portion, the tubular body (32) and the spring (35), and this combination functions as a reset mechanism (3) as described later.

A shut-off valve (2) is provided facing the valve seat (33) at the downstream end of the cylindrical body (32).
Is penetrated through the permanent magnet (21) and the electromagnet (22) built in the constituent wall of the gas stopper main body (1). This shaft portion is made of a magnetic material, and when the valve body (20) is located at the downstream end of the empty chamber (14), the shaft portion is made of a permanent magnet (21).
The yoke (24) has a dimensional relationship in contact with a protruding piece (25) formed in the center of the yoke (24). In addition, the said holding force is a valve body (2
0) and the biasing force of the spring (23) interposed between the downstream end constituting wall of the empty room (14) and the wall. or,
The direction of the lines of magnetic force generated in the electromagnet (22) is the same as that of the permanent magnet (2).
It is set in the opposite direction to that of 1), and the magnitude of the magnetic force is made to substantially match the magnitude of the magnetic force generated in the electromagnet (22). Therefore, when the electromagnet (22) is in a non-conductive state and the valve element (20) is located at the downstream end of the vacant chamber (14), the valve element (2) is magnetized by the permanent magnet (21).
0) is held in this state, and the electromagnet (2)
When 2) becomes conductive, the magnetic force of the permanent magnet (21) is canceled by the magnetic force of the electromagnet (22), and the valve element (2) is turned off.
0) is pushed toward the valve seat (33) by the urging force of the spring (23).

When the plug (11) is in the fully opened state,
The cylindrical body (32) is located at the most upstream side in the empty chamber (14) as described above, but is attracted and held by the valve seat (33) at the downstream end of the cylindrical body (32) and the permanent magnet (21). There is a certain distance from the valve body (20). This interval is set smaller than the moving range of the valve element (20), and when the attraction force of the permanent magnet (21) is lost, the valve element (20)
Is brought into contact with the valve seat (33) by the urging force of the spring (23), and the valve body (20) is closed. In addition, plug body (1
The moving stroke of the cylinder (32) due to the pairing between the cam (12) formed in 1) and the shaft (34) at the upstream end of the cylinder (32) corresponds to the valve seat at the downstream end of the cylinder (32). The distance between (33) and the valve body (20) is made to coincide with the above-mentioned distance.

The above-mentioned embodiment is used by being electrically connected so as to operate in conjunction with the gas leak alarm (4) as in the prior art. In a normal use state, the valve body (20) is in a state shown in FIG. 5, and the valve body (20) is suction-held in a valve-open state by a permanent magnet (21). And in this state,
The cylinder (32) is located on the most upstream side, and the shaft (34)
Project into the passage hole (13). Further, the ball valve (36) of the overflow prevention valve is located at the upstream end in the cylindrical body (32),
The gas that has passed through the passage hole (13) flows downstream from the gap between the ball valve (36) and the cylindrical body (32), and flows from the mouth (37) through the hose end (H) to the downstream gas. Gas is supplied to the instrument. When the gas rubber pipe connected to the hose end (H) comes off, the action of the over-spill valve prevents the valve shown in FIG.
As shown by the imaginary line, the ball valve (36) is moved downstream (upward) to fit into the mouth (37), and the gas circuit is shut off in the cylinder (32). It operates as described above when a much larger amount of gas flows than during normal use.However, if gas leakage occurs under conditions where the gas flow rate is not much different from that during normal use, prevent overflow. The valve does not perform the above operation.

However, since the electromagnet (22) is connected to the gas leak alarm (4), when the gas leak alarm (4) detects the gas leak, the electromagnet (22) becomes conductive. Normally, the gas leak alarm (4) is provided with an alarm device as an output device. The circuit of the alarm device and the circuit of the electromagnet (22) are connected in parallel.
A pulse current is applied to the electromagnet (22) at regular time intervals after a lapse of a short time from the start of operation of the gas leak alarm (4). When the electromagnet (22) is turned on by the applied pulse, the magnetic force of the electromagnet (22) and the permanent magnet (21) cancel each other out, and as shown in FIG. 3, the valve body (20) is biased by the spring (23). The valve is closed. This stops the gas leak condition, and thereafter the output from the gas leak alarm (4) also disappears.

Thereafter, when the stopper (11) is rotated in the closing direction, as shown in FIGS. 1 and 2, the cam (12) and the shaft (34) are paired to form a cylinder ( 32) is moved by a fixed stroke to the downstream side, and the valve element (20) is moved to the most downstream side of the vacant chamber (14). At this point, the electromagnet (22)
Is in a non-conductive state, the valve element (2)
The shaft portion of (0) is attracted and held by the permanent magnet (21). That is, the valve element (20) is reset. As described above, in this embodiment, the cam portion, the cylindrical body (32), and the spring (3)
The combination of 5) functions as the reset mechanism (3).
In addition, the gas flow path (10) is shut off by the gas stopper by the above operation, and the maintenance and inspection of the downstream side of the stopper body (20) including the shutoff valve (2) can be performed. Thereafter, the gas circuit on the downstream side of the gas plug main body (1) is restored to a normal state, and when the plug (11) is rotated to the fully open position, the valve (2) is opened.
0) is attracted and held by the permanent magnet (21), so that the cylinder (32) is moved to the most upstream side by the urging force of the spring (35) while the valve is kept open, and the state shown in FIG. Return.

The ball valve (3) accommodated in the cylinder (32)
6) is set so that, when fitted into the mouth portion (37), the top portion projects partly downstream from the valve seat (33). Therefore, in the overflow state, the ball valve (36)
When the plug (11) is rotated to the fully closed state after the operation of the valve, the valve seat (33) and the valve body (20) come into contact with each other. And fall to the lower end in the cylindrical body (32). That is, the overflow prevention valve is reset. Needless to say, the reset operation of the overflow prevention valve is performed even when the valve body (20) comes into contact with the valve seat (33) by the operation of the shutoff valve (2).

Further, in this embodiment, in order to ensure the outer peripheral airtight state of the cylindrical body (32), the downstream side of the vacant chamber (14) is defined as an enlarged vacant chamber (16), and the packing in contact with the end face of this boundary is used. (P), the cylindrical body is equipped with a flange (38), and when the plug (11) is in a fully open state, the packing is in contact with the end face, and the plug (11) is closed. When the cylinder is lifted in the valve state, the packing (P) is separated from the end face. Therefore, the driving resistance of the cylindrical body (32) which is raised and lowered in conjunction with the rotation of the stopper is reduced. In order to ensure the airtightness of the outer periphery of the cylindrical body (32), the vacant space (14) is allowed to allow the cylindrical body (32) to slide by an O-ring or the like.
A structure in which an O-ring or the like is interposed between the inner surface of the cylinder and the outer peripheral surface of the cylindrical body may be adopted. Since the surface is not in a sliding state, the driving resistance of the cylindrical body (32) is reduced. As a result, by incorporating the reset mechanism (3) of the valve (20), the operation torque of the plug (11) does not become excessive.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention in a state where a stopper (11) is fully closed.

FIG. 2 is a sectional view taken along line XX.

FIG. 3 is a sectional view showing a state where a shut-off valve (2) is operated.

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

FIG. 5 is a sectional view in a normal use state.

FIG. 6 is an explanatory view of a conventional example.

[Description of sign]

 (2) ... shut-off valve (1) ... gas stopper body (11) ... stopper (20) ... valve (3) ... reset mechanism (32) ... cylinder ( 33) ・ ・ ・ Valve seat

Claims (1)

(57) [Scope of request for utility model registration] A shut-off valve (2) of a type which is automatically closed by a signal input to a plug (11) in a gas plug body (1).
The shut-off valve (2) is configured to be reset to an open state when the valve body (20) is forcibly returned to the initial position, and the valve body (20) is returned to the initial position. In a gas plug with an emergency shut-off valve provided with a reset mechanism (3), the plug (11) is a rotatable plug, and a cylinder (32) that moves forward and backward in conjunction with the plug (11) is plugged. Body (1
1) is housed in a circuit on the downstream side in an outer peripheral airtight state, and a valve seat (33) is provided at a downstream end of the cylindrical body (32).
The valve body (20) of the shut-off valve (2) is disposed so as to face 3), and the interlocking relationship between the plug (11) and the cylinder (32) is as follows.
In the fully closed position of the plug (11), the valve seat (33) advances toward the valve (20) and coincides with the initial position of the valve (20), and in the fully opened position of the plug (11). A gas stopper with an emergency shut-off valve, which is set at a position away from the initial position by a certain distance.