JPS598706B2 - On-off valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a biasing mechanism equipped with a weight for urgently shutting off a valve body, and a normal opening/closing operation unit equipped with an artificial operating tool and a speed reducer for normally opening and closing the valve body. The present invention relates to an on-off valve provided with a stopper that fixes the weight of the biasing mechanism in a state having potential energy for emergency shutoff, and a mechanism that releases the stopper function of the stopper.

Conventionally, this type of on-off valve has been constructed by fixing the arm 10 of the biasing mechanism 6 to the valve shaft 3 of the valve body 2, as disclosed in Japanese Utility Model Application No. 53-125120 (see FIG. 6). A weight 15 is attached to the arm 10, and the valve body 2
and the biasing mechanism 6 are integrally connected and movable, and the clutch 32' is used to return the valve body from the fully closed state to the fully open state.
After mating, the manual operating tool 34 is activated, and after returning to the fully open state, the pin device is locked, and the clutch 3z is disengaged to bring the biasing mechanism 6 into the emergency cutoff preparation position. It is composed of

In this conventional configuration, since the valve body 2 and the biasing mechanism 6 are only integrally connected, the inventor recognized that the operating force required to return the valve body to the fully open state is extremely large. .

Moreover, this return operation is necessary not only in rare cases where the valve is closed due to an emergency shutoff due to an abnormal situation, but also in cases where the valve body needs to be opened and closed for maintenance. It had the disadvantage of requiring a large amount of operating force.

In addition, in order to reduce this operating force, it is conceivable to change the reduction ratio of the reducer 33 to solve the problem, but the reduction gear becomes bulky and the structure becomes complicated, and the number of operations required for manual operation is increased. The disadvantage is that it increases.

The inventor considered that the above-mentioned drawbacks are caused by the fact that the valve body 2 and the biasing mechanism 6 are integrally connected.

The technical problem to be solved by the present invention is to provide an emergency shutoff valve with a valve body and a weight biasing mechanism, in which the amount of operating force required for operation is small. The aim is to create a mechanism that allows easy resetting using a light and small device.

The technical measures taken to solve the above technical problems are:
a first clutch that selectively connects and disconnects the interlocking between the valve body and the biasing mechanism; and second and third clutches that selectively disconnect and disconnect the valve body and the biasing mechanism from interlocking with the speed reducer, respectively. It is to establish.

The above technical means works as follows.

That is, by bringing only the first clutch into the engaged state, an emergency shutoff preparation posture is created in which the valve body and the biasing mechanism are interlocked, and by bringing only the second clutch into the engaged state, the valve body and the reduction gear are brought into contact with each other. A state in which the biasing mechanism and the speed reducer are interlocked can be brought about by creating a state in which they are interlocked and by bringing only the third clutch into the engaged state.

As a result of the above, the present invention has the following effects.

That is, in order to reset the valve body and the biasing mechanism from the closed state of the valve body to the emergency shutoff preparation position, first, only the third clutch is brought into the engaged state, and the biasing mechanism and the reduction gear are interlocked. Only the biasing mechanism is returned manually and fixed with the rear stopper. Next, in this state, only the second clutch is engaged, only the valve body is opened, and then only the first clutch is engaged. Therefore, since the valve body and the biasing mechanism can be moved separately, the large operating force required when the two are connected together can be reduced by half, and the structure of the device can be reduced to a single position. Now, the valve body and biasing mechanism can be easily reset.

In addition, when only the second clutch is engaged, only the valve body can be opened and closed with a light manual operation tool, so when servicing this opening/closing valve, the unique effect of opening and closing the valve body is light and easy to handle. This resulted in the occurrence of

Next, embodiments of the present invention will be described in detail based on the drawings.

An on-off valve 4 is interposed in the flow path of the fluid transport pipe 1 with a valve shaft 3 having a valve body 2 connected thereto in a horizontal position, and one end of the valve shaft 3 is made to protrude from the valve box 5. A biasing mechanism 6 for emergency shutoff of the valve body 2 is provided at the shaft end, and a biasing mechanism 6 for shutting off the valve body 2 during normal operation.
An operating section 7 for opening/closing is connected via a linkage mechanism 8.

To configure the biasing mechanism 6, as shown in FIGS. 2 and 3, an arm 10 is integrally connected to a cylindrical body 9 that is key-fitted to the valve shaft 3 so that it can only slide freely. Continuous cylinder body 1
A first clutch 13 is provided rotatably fitted on the outside of the arm 10 and is selectively engaged and engaged by a shifter 12 across both cylinders 9 and 11. A weight 15 is attached to the arm 10.
is attached, and in a state where the valve body 2 is in the open state and the biasing mechanism 60 weight 15 has potential energy for urgently shutting off the valve body 2, the biasing mechanism 6 is fixed. A stopper 16 is provided across the arm 10 and a bracket 17 connected to the valve box 5.

An electrically actuated release mechanism 18 is connected to the stopper 16, and an operating mechanism 19 for this release mechanism 18 is constructed as follows.

That is, as shown in FIG. 1, a short pipe 20 equipped with a lid is connected to the transport pipe 1 downstream of the on-off valve 4 in the flow path, and a short pipe 20 is connected to the short pipe 20 so as to be rotatable around a horizontal axis. A shaft 21 is installed in the shaft 21, and an arm 23 having a pressure receiving member 22 attached thereto is connected to the shaft 21 in a hanging manner, and the shaft 21 is made to protrude from the short pipe 20, and the shaft end is connected to the pressure receiving member 22. A mechanism 24 is provided that applies a biasing force that resists the applied fluid dynamic pressure, and the hanging posture of the pressure receiving member 24 is maintained against the biasing mechanism 24 when the dynamic pressure is lower than the normal fluid dynamic pressure. A stopper 25 is provided to stop the pressure receiving member 2 from acting against the biasing mechanism 24 due to the fluid dynamic pressure of the abnormal flow passing through the flow path when an abnormal situation such as a downstream flow pipe rupture occurs.
A mechanism 26 for electrically detecting the rocking displacement of 2 is provided in conjunction with the arm 27 of the biasing mechanism 24, and this displacement detection mechanism 26 and the release mechanism 18 are electrically coupled, In conjunction with the detection of abnormal flow by the pressure receiving member 22, the fixation of the stopper 16 to the biasing mechanism 6 is automatically released, and the biasing mechanism 60 and the weight 15 fall to swing the arm 10 and open/close the opening/closing operation. Valve 4 is configured to be shut off in an emergency.

The operating mechanism 19 for the release mechanism 18 may be one that operates the release mechanism 18 based on the detection of abnormal flow by a flow meter, or uses a seismometer to detect the occurrence of abnormal flow due to damage to a transport pipe due to an earthquake. In a predicted manner, the release mechanism 1 is activated based on vibration detected by the seismometer that exceeds the setting
8, the configuration of the operating mechanism 19 can be modified in various ways. In particular, such flowmeters and seismometers are generally installed in fluid transport systems, and can be used effectively. It is preferable.

As shown in FIGS. 2 and 3, the normal opening/closing operation section 7 includes a rotating shaft 28 concentrically with respect to the valve shaft 3.
A cylindrical body 29 is key-fitted to the rotary shaft 28 so as to be able to slide only freely, and a shifter 30 is used to connect and connect the restraining body 29 and the opposite ends of the clutch cylindrical body 9 to the valve shaft 3. A second clutch 31 is provided which is operated, and a third clutch 32 is provided which is operated on and off by a shifter 30 across the opposite ends of the cylinder 29 and the cylinder, and a reducer 33 comprising a worm and a worm gear is provided. A human operating tool 34 is connected to the rotating shaft 28 and connected to the worm of the reducer 33, and the operating tool 34 is connected to the second and third clutches 31, 32 and the biasing mechanism 6. 1st clutch 1 connected to
3 constitutes a linkage mechanism 8.

That is, by a combination of clutch engagement/disengagement operations by the shifters 12 and 30, as shown in FIG. 3, only the first clutch 13 is in an engaged state, that is, a state in which the valve body 2 and the biasing mechanism 6 are interlocked, resulting in an emergency shutoff preparation posture. A and the normal state in which only the second clutch 31 is engaged, that is, the valve body 2 and the speed reducer 330 rotating shaft 28 are interlocked, with the biasing mechanism 6 fixed by the stopper 16, as shown in FIG. As shown in the valve opening/closing operation state B of FIG.
It is possible to selectively obtain an operation state C in which only the valve body 2 is in the ON state, that is, a state in which the biasing mechanism 6 and the rotating shaft 28 of the reducer 33 are interlocked. By causing the operation state B to appear, only the valve body 2 can be opened and closed with a light manual operation force, and after the valve body 2 is shut off by the biasing mechanism 6, the valve body 2 can be operated to perform the emergency shutoff action. When returning to the state, first, the operating state C is brought out, only the biasing mechanism 6 is returned by manual operation, and this state is fixed by the stopper 16, and then the operating state B is brought out. Then, only the valve body 2 is operated to open, and then the emergency shutoff state A is brought about.

Of course, it is possible to bring both the first and second clutches 13 and 31 into the engaged state and operate the valve body 2 and the biasing mechanism 6 all at once to bring about the emergency cutoff state A and return to the emergency cutoff state. Also available.

[Brief explanation of the drawing]

The drawings of FIGS. 1 to 5 show an embodiment of the on-off valve according to the present invention, FIG. 1 is a side view of the fluid transport pipe portion, FIG. 2 is a sectional view of the on-off valve and the on-off operation part thereof, 3 to 5 are operational cross-sectional views of the clutch showing operating states A, B, and C, respectively, and FIG. 6 is a partially vertical front view showing a conventional example. 2... Valve body, 6... Biasing mechanism, 7...
...Normal opening/closing operation unit, 13...First clutch, 15...Weight, 16...Stopper, 31...Second clutch, 32・・・・・・
...Third clutch, 33...Reducer, 34...
...Artificial operation tool.

Claims (1)

[Claims] 1. An emergency shutoff biasing mechanism 6 equipped with a weight 15 for shutting off the valve body 2 in an emergency; and a normal opening/closing operation section 7 equipped with an artificial operating tool 34 and a speed reducer 33 for normally opening and closing the valve body 2. , a stopper 1 that fixes the weight 15 of the biasing mechanism 6 in a state having potential energy for emergency shutoff.
6 and a mechanism for canceling the stopper function of the stopper 16, the first clutch 13 selectively connects and disconnects the movement of the valve body 2 and the urging mechanism 6;
The speed reducer 33 is connected to the valve body 2 and the biasing mechanism 6, respectively.
2nd and 3rd clutches 31 selectively interlocking with and interlocking with
, 32.