JPS6141481Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas cutoff device that receives an electric signal from a gas leak detector to cut off the outflow of gas when a gas leak occurs.

In most of the conventional blocking devices of this type, the key mechanism for blocking the gas flow path is built into the gas flow path, which makes assembly and repair difficult. However, if this were to have an earthquake-resistant structure, the entire device would be enormously bulky, and at present, earthquake resistance is sacrificed to some extent in order to reduce the difficulty of processing and assembling, and to balance costs.

However, in such cases, the main parts of the equipment are often destroyed by falling objects during an earthquake due to a decline in earthquake resistance, and gas leakage due to structural destruction during an earthquake becomes a problem, even in normal times.

On the other hand, a gas cutoff device has only a few parts such as a valve body, a part of the valve operating rod, and a spring built into a base body with a gas flow path and a valve seat, and a valve shutoff operation mechanism is installed outside the base body. In other words, it can be said that the above-mentioned problems can be solved to a large extent with an external type of valve shutoff operation mechanism, but the above-mentioned external type using a solenoid, which has been seen in the past, lacks functional reliability and structural durability. There is still room for improvement.

In order to eliminate the above-mentioned conventional drawbacks, the present invention aims to provide an earthquake-resistant device that is not only compact and simple but also has a stable flow blocking function. This will be explained in detail.

1 and 2, a base body 1 has a gas passage 2 formed therein, and gas passages 3a and 3b are opened at both ends of the gas passage 2. As shown in FIGS.

Further, the gas passage 2 of the base body 1 has a communication chamber 2 in the middle thereof.
a and a valve chamber 2b, and both chambers 2a,
A valve seat 4 is formed at the boundary of 2b, and
The valve chamber 2b is closed by a lid 5.

On the other hand, the valve body 8 is provided with a packing 6 on the plate surface for closing the valve, and a fitting pin 7 is provided upright from the center of the plate surface.
The gasket 6 is placed inside the valve chamber 2b in a state facing the valve seat 4, and is subjected to an elastic force in the valve closing direction by a spring 9 between the valve body 8 and the lid body 5.

Next, the valve operating rod 10 has a protruding end 10 at one end in the longitudinal direction and a pushing end 10b at the other end, and the outer periphery of the protruding end 10a is machined to have a stepped engagement ring. Section 11a and relevant section 1
1b is formed, and a fitting hole 12 corresponding to the fitting pin 7 is bored from the end surface of the pushing end 10b.

This valve operating rod 10 has a protruding end 10a at one end thereof.
is placed outside the base body 1, and the other end of the pushing end 10b is inserted into the base body 1.
In the illustrated case, the rod 10 passes through a cylindrical body 13 equipped with an O-ring, a grease groove, etc. and fitted to the base 1, and the pushing end 10b is connected to the fitting pin 7 in the communication chamber 2a. In the fitted state of the fitting hole 12 and the fitting hole 12, the valve body 8 faces and comes into contact with the valve body 8.

In the above, a valve shutoff operating mechanism 14 is attached to a predetermined outer surface of the base 1, that is, the outer surface of the base where the protruding end 10a of the valve operating rod 10 is disposed, and the mechanism 14 is shown in FIGS. As shown in the figure, it is constructed as follows using each necessary member.

First, the mounting plate 15 has a flat plate part 15a and a flat plate part 1.
The flat plate part 15a has an insertion hole 16 for the valve operating rod 10 in the plate surface thereof, and a hole 16 is provided near the insertion hole 16. A fulcrum part 17 is erected,
Further, a receiver 18 is attached to the upright plate portion 15b.

On the other hand, the locking pin 19 is supported via a holder 20, and this holder 20 is a flat plate part 20a.
The flat plate part 20a has a concave notch 20, the vertical plate part 20b has a fulcrum hole 22, and the vertical plate part 20c has a fulcrum hole 22. A horizontally long sliding hole 23 is formed in each of the holes.

The locking pin 19 is supported by the upright portions 20b and 20c of the holder 20 with one end having the stop ring 24 inserted into the fulcrum hole 22 and the other end inserted into the sliding hole 23. The end portion inside the sliding hole 23 is adapted to slide along the same hole 23.

Furthermore, the solenoid 26 is equipped with a push/pull rod 27 that moves by pushing and pulling when the solenoid 26 is energized and released.Of the operating lever 28 and operating body 29 that are connected to the solenoid 26, the operating lever 28 has a display member 30 at one end thereof. A cam portion 31 is formed at the other end.

On the other hand, the actuating body 29 has a U-shaped base end 29a and an upright plate-like tip 29b.
includes a cam engagement pin 32 that engages with the cam portion 31;
is provided in the form of a vertical shaft, and the tip 2
9b is a push rod 33 made of a threaded rod and whose movement can be adjusted freely.
is attached horizontally.

In the above, the holder 20 supporting the locking pin 19 has its recess 21 aligned with the insertion hole 16,
The locking pin 19 is mounted on the flat plate part 15a of the mounting plate 15 in a state where it is substantially parallel to the vertical plate part 15b, and the solenoid 26 is moved to the opposite side of the vertical plate part 15a and placed on the flat plate part 15a. It is attached.

Further, the operating lever 28 is rotatably supported at its longitudinal intermediate portion via the fulcrum portion 17 on the flat plate portion 15a and a screw 34 screwed into the fulcrum portion 17, and the actuating body 29 is shaped like a U-shape. The base end portion 29a is placed over the receiver 18 of the upright plate portion 15b, and is rotatable about a shaft pin 35 passing through the base end portion 29a and the receiver 18 as a fulcrum.

The push rod 27 of the solenoid 26 and the end portion of the operating lever 28 having the display member 30 are connected to a connecting member 36 via shaft pins 37 and 38, and the cam portion 31 of the operating lever 28 and the operating body 29 are connected to each other via shaft pins 37 and 38. The cam engaging pins 32 of the operating body 29 are engaged with each other, and the push rod 33 on the tip end 29b side of the operating body 29 abuts against the locking pin 19 supported by the holder 20.

In addition, the vertical plate portion 15b of the mounting plate 15 and the locking pin 1
A spring A is applied across the sliding end of the actuator 9, and a spring B is applied across the tip 29b of the actuating body 29 and the holder 20.

Of these springs A and B, one spring A is for pulling the tip 29b equipped with the push rod 33 toward the locking pin 19, and the other spring A is for operating the locking pin 19 as described above. The spring force is applied to the engaging portion 11a of the rod 10, and both spring forces oppose each other, but the force relationship is A<B.

In addition, in the above, the transmission system 39 extending from the solenoid 29 to the locking pin 19 includes the operating lever 28,
It is composed of an actuating body 29 and the like.

The valve shutoff operating mechanism 14 having the above-described configuration is installed on a predetermined outer surface of the base body 1 described above, and at this time, the protruding end 10a of the valve operating rod 10 passes through the insertion hole 16 of the mounting plate 15. , its engagement part 11
a corresponds to the locking pin 19 in a freely engaging and detachable manner.

Further, in the flat plate portion 15a of the mounting plate 15, a stopper 41 is attached to the vicinity of the insertion hole 16 via a screw 40 so that its tip portion 41a abuts both the engaging portion 11a and the engaging portion 11b. It's getting old.

In the figure, 42 is a lid for covering the valve shutoff operation mechanism 14, and this lid 42 is fixed to the base 1 with screws.
As shown in the figure, a see-through section 43 is provided for viewing the display member 30 of the operating lever 28 from the outside.

44 is a known gas leak detector, which is connected to the solenoid 26b described above.

When the device of the present invention consists of the above-described embodiment, the device is incorporated into a piping system that connects a gas supply source such as a gas cylinder and a gas appliance, and the piping connections in this case are as known to the gas vents 3a and 3b. Insert the gas pipe.

When the valve is opened, the valve element 8, which is receiving an elastic force in the valve closing direction via the spring 9, is pushed down by the valve operating rod 10 to separate the valve element 8 from the valve seat 4, and the valve operating rod 10 is pressed down. A locking pin 19 is attached to the locking portion 11a.
to keep the valve open.

When the valve is held open in this way, the push-pull rod 27 of the solenoid 26 projects in the X direction in FIG.
The cam portion 31 side of the operating lever 28 rotates in the Z direction in the figure, and the cam portion 31 side further rotates in the Z direction in the figure, and is further operated via the cam portion 31 and the cam locking pin 32. The tip end 29b of the actuating body 29 that interlocks with the lever 28 rotates in the direction R in the figure against the spring B.

Therefore, when each part is in this state, the push rod 33 that is in contact with the locking pin 19 is also moving in the direction R in FIG.
No force is exerted to remove it from a.

Conversely, since the locking pin 19 is under the tension of the spring B, in the above state, the locking pin 19
will not come off inadvertently from the engaging portion 11a.

As long as a gas leakage accident does not occur, the valve will remain open, and the gas flow path 2 in the base 1 will remain open.
The gas flowing through a, 2b, etc. is from gas vent 3a to 3.
b (or from 3b to 3a), but if a gas leak occurs, such as when a gas appliance goes out due to an unforeseen cause, the valve will be closed as follows, and the gas supply will be interrupted. is blocked.

In other words, when a gas leak occurs, the gas leak detector 4
4 immediately detects this and sends a pulse current to the solenoid 26, energizing the solenoid 26.

The energized solenoid 26 moves the push rod 27 to the third position.
As a result, the cam portion 31 side of the operating lever 28 rotates in the Z′ direction in the same figure, and the engagement between the cam portion 31 and the cam engagement pin 32 is displaced to a shallow state. As a result, spring B
The tip end 29b of the actuating body 29 is receiving a tensile force of
rotates in the R' direction in Figure 3, and the push rod 33 also rotates in the same direction to push the locking pin 19 in the Y' direction in the Figure against the spring A, thereby locking the lock. Remove the pin 19 from the engaging portion 11a of the valve operating rod 10.

With the locking pin 19 removed, the valve operating rod 10 no longer has the force to hold the valve open, and therefore the valve element 8, which is receiving an elastic force in the valve closing direction via the spring 9, comes into close contact with the valve seat 4. Close it and cut off the gas supply.

The open and closed states of the valve can be confirmed by reading the position of the display member 30 through the transparent portion 43. The base body 1 described above and each member assembled inside and outside thereof, except for the packing 6, the display member 30, the see-through part 43, etc., are mainly formed by metal molding, metal machining, etc.

As explained above, in the present invention, a gas flow path and a valve seat are provided inside a base body, and a spring is interposed in the base body to apply a force in the valve opening direction to the valve seat. The valve operating rod has an internal valve body for opening and closing, and is movable in the valve opening and closing direction by penetrating the base body. One end of the rod inserted into the base body corresponds to the valve body so that it can interlock with the valve body. A locking portion is formed on the outer periphery of the other end that protrudes outside the body, and a valve shutoff operation is performed on the outer surface of the base body where the protruding end of the valve operating rod having the locking portion is located, corresponding to the protruding end. In the gas cutoff device, the valve cutoff operation mechanism includes a locking pin that intersects with the protruding end of the valve operating rod and is removably engaged with the engaging portion of the protruding end; A holder supporting the locking pin at both ends so that it can move in the locking/unlocking direction, a power solenoid for disengaging the locking pin from the locking portion, and a transmission system between the locking pin and the solenoid. It is characterized by having the following.

Therefore, in the case of the device of the present invention, not only is the valve cutoff operating mechanism of an external type that satisfies the simplicity and earthquake resistance of the internal structure of the base body, but also that the locking pin intersects with the protruding end of the valve operating rod. The locking pin and the locking portion are engaged and detachable from each other, and since the direction of movement of the locking pin and the direction of movement of the valve operating rod are different from each other, the locking pin and the locking portion are relatively locked. In the so-called locking state, the locking pin does not come off inadvertently and the valve operating rod does not move inadvertently, providing stability. Since only a very small locking force is required, no fatal problem such as deformation of the valve operating rod occurs.

Furthermore, since the solenoid indirectly operates the locking pin via the transmission system, damage to the solenoid that tends to occur when the solenoid directly drives the locking pin can be avoided.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an embodiment of the gas cutoff device according to the present invention, Fig. 2 is a sectional view taken along the line - Fig. 1, and Figs. FIG. 2 is a plan view and an exploded perspective view. DESCRIPTION OF SYMBOLS 1... Base body, 2... Gas flow path, 2a... Communication chamber, 2b... Valve chamber, 3a, 3b... Gas vent, 4
... Valve seat, 8 ... Valve body, 9 ... Spring, 10
...Valve operating rod, 10a...Protruding end, 10b...
Pushing end portion, 11a... Engaging portion, 14... Valve shutoff operation mechanism, 20... Holder, 26... Solenoid,
19...Lock pin, 39...Transmission system, 44...Gas leak detector.

Claims (1)

[Scope of utility model registration request] A gas flow path and a valve seat are provided inside the base, and a valve body for opening and closing the valve seat is housed inside the base with a spring interposed therebetween for applying force in the valve opening direction. The valve operating rod, which can penetrate the base in the valve opening/closing direction and move in the same direction, has one end interposed within the base so as to be interlocked with the valve body, and the other end protruding outside the base on the outer periphery. A gas cutoff device in which a locking portion is formed, and a valve shutoff operation mechanism is provided on the outer surface of the base body where the projecting end of a valve operating rod having the locking portion is located, corresponding to the projecting end. In the valve shutoff operation mechanism, the locking pin intersects with the protruding end of the valve operating rod and corresponds to the locking portion of the protruding end in a freely engaging and disengaging manner, and the locking pin is moved in the locking and disengaging direction. A gas cutoff device comprising: a holder that can be supported at both ends; a power solenoid for causing the locking pin to escape from the locking portion; and a transmission system between the locking pin and the solenoid.