JPS6124771Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a valve opening/closing operation device.
Normally, the valve operates at a constant speed, but in emergencies such as power outages, it has the function of rapidly closing the valve at high speed.

The discharge valve of a pump that transports water to high places normally opens and closes slowly to prevent abnormal fluctuations in the pressure in the discharge pipe, but if the pump suddenly stops supplying water due to a power outage, etc., the valve should be opened and closed slowly. It must be closed quickly to prevent backflow of water and reversal of the pump.

Conventionally, this type of equipment often relies on hydraulic operation, in which case maintenance of the hydraulic equipment is troublesome.
Protective equipment was also required to prevent fires from occurring. Another method is to use two types of electric motors, one for low speed and one for high speed, to switch the operating system, but this would complicate the device and pose a risk of switching failure.

In addition, as proposed in Utility Model Application Publication No. 53-10430, a screw shaft and a
Some models are equipped with a piston mechanism for emergency operation on the operating rod connected to this. However, since the opening/closing device must always apply force in the direction of closing the valve using the force of a spring, etc., the electric motor used as the normally operating drive machine must apply the aforementioned force in addition to the valve operating force. A power source must be provided to resist the force, resulting in an increase in the size of the device and uneconomical effects.

This idea was devised in consideration of these points, and in normal times it is easy to use electric operation,
In case of an emergency, the valve is closed quickly using the pump's self-pressure water, etc., but the valve opening/closing device can be made more compact and requires only the operating force to operate the valve during normal operation. The purpose is to provide a highly economical mechanism.

That is, this invention is a rotary valve that controls opening and closing of a fluid flow path by a valve so as to be able to rotate inside a valve body, in which an opening/closing lever having a fork-shaped groove is fixed to a valve shaft that drives the valve, and the fork-shaped groove is fixed to a valve shaft that drives the valve. The drive shaft is rotatably provided via a bearing in the center of a drive shaft that rotates a crosshead in forward and reverse directions, and a spline provided on one side of the drive shaft is fitted with a worm wheel, The piston is rotatably driven by a worm, and the other side of the drive shaft is provided with a screw, and a piston having a rotatable hollow piston rod with a female screw threaded thereto is provided in the cylinder, and a piston is provided in the cylinder with ports on both sides of the cylinder. A four-way switching valve is provided between the operating pressure source, and during normal times, the valve is opened and closed via the worm gear mechanism, and in an emergency, the four-way switching valve is switched to quickly close the valve via the piston mechanism. This is a valve opening/closing operation device characterized by the following.

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a valve body, 2 is a valve shaft that passes through the valve body 1,
3 is a valve fixed to the valve stem 2.

In the present invention, an opening/closing lever 4 is fixed to the outer protrusion of the valve shaft 2, and a fork-shaped groove 4a is formed in the free end of the lever 4. Also, a spline 5a is formed on one side of the shaft (the right side in FIG. 1), and a screw 5b is formed on the other side (the left side in FIG. 1).
A drive shaft 5 is provided so as to be perpendicular to the valve shaft 2 at an appropriate interval, and is rotatable and slidable relative to the fixed case 6. A fixed case 6 is fixed to the valve body 1. A worm gear case 7 is connected to the right side of the case 6 in FIG. 1, and a cylinder 9 is connected to the left side via a joint case 8.
is connected.

Further, a worm wheel 10 is fitted to the spline 5a of the drive shaft 5, and the worm wheel 10
The worm 11 that meshes with the worm 11 can be rotated in forward and reverse directions via an electric motor (not shown). This drive shaft 5
A crosshead 13 having a protrusion 13a is provided through a bearing 12 in the center of the crosshead 1.
3, the drive shaft 5 is made rotatable.

Then, the protrusion 13a of the crosshead 13 is engaged with the fork-shaped groove 4a of the opening/closing lever 4, so that the valve 3 can be opened and closed via the opening/closing lever 4 and the valve shaft 2 as the crosshead 13 moves.

Further, a piston 14 is provided within the cylinder 9,
This piston rod 15 is formed into a hollow cylindrical shape, and a female thread 15a is formed on the inner circumference thereof.
It is screwed into the screw 5b of the drive shaft 5. Note that this piston rod 15 is prevented from rotating. As an example, as shown in FIG.
At the same time, the piston 14 is provided with a groove 14a that fits into the protrusion 9a.

Further, 16 and 17 are ports provided at both ends of the cylinder 9, 18 is an electromagnetic four-way switching valve, 19 is a self-pressure water supply source for the pump, 20 is an on-off valve, 21 is the atmosphere, 22 is an orifice, and 23 is a This is a limit switch installed in the worm gear case, which operates when the valve 3 is fully closed to stop the electric motor.

Further, 24 in FIG. 4 is a spring used to operate the piston 14.

Next, the operation of the device of the present invention constructed as described above will be explained. When the four-way switching valve 18 is a solenoid valve, in the energized state shown in FIG.
This pressure constantly pressurizes the right side of the piston 14. In order to open and close the valve 3 in this state, if the electric motor attached to the worm 11 is started to rotate the drive shaft 5, the piston rod 15 will not move, so the action of the female thread 15a and the screw 5b will cause the drive shaft to rotate. will move in and out of the piston rod 15. This action is transmitted to the valve shaft 2 via the protrusion 13a of the crosshead 13 and the opening/closing lever 4, and opens and closes the valve 3. That is, FIG. 1 shows the valve 3 in a closed state, and FIG. 5 shows it in an open state. In the event of a power outage, the four-way switching valve 18 switches from the state shown in FIG. 5 to the state shown in FIG. Apply pressure to. At this time, the spline 5a of the drive shaft 5 slides within the groove of the worm wheel 10, so the drive shaft 5, together with the piston 14 and piston rod 15, is pushed to the right at once, and the valve 3 is fully closed as shown in FIG. This operation is the same even when the valve 3 is at an intermediate opening degree.

Next, when the power outage is restored, the four-way switching valve 18 will switch again as shown in Figure 5, so as the pump is restarted and the self-pressure water gradually increases, the piston 14 will gradually move to the left. Then, it becomes ready again for emergencies. At this time, the valve 3 also opens slowly at the same time, so that the operation is suitable for use.

As described above, according to the present invention, only the drive shaft is operated by electric operation that is easy to handle in normal times, and since the piston is a mechanism that is internally screwed into the piston rod and moves in and out, it is necessary to resist unnecessary force. There is no
The valve can be opened and closed slowly and with only the operating force needed to close the valve, and in an emergency, the valve can be closed quickly using only the operating force required to quickly close the valve using self-pressure water, so there is no need for any special protective equipment or An opening/closing device that does not require extra operating force, is smaller in size, and is easier to maintain can be obtained.

The above explanation has been given using a specific example for quick closing during a power outage. However, when using the device of the present invention for quick closing in response to abnormal pressure fluctuations in a pipeline, the four-way switching valve 18 is It is sufficient to use a four-way switching valve that responds to the

Regarding self-pressure water, if the self-pressure water of the pump drops significantly due to a power outage and the required operating pressure of the piston 14 cannot be obtained, a spring 24 may be used as an auxiliary aid as shown in Fig. 4. , or only by the acting force of the spring 24, the piston 14
All you have to do is activate it. Further, if necessary, it is also possible to use water pressure from an elevated water tank, a pressure water tank, etc. as the operating pressure source for the piston 14 instead of the self-pressure water.

It goes without saying that the opening/closing operation device of the present invention can be used not only for the butterfly valve shown in the figure, but also for rotary valves such as ball valves and funnel valves.

As mentioned above, this invention uses electric operation that is easy to handle and does not require unnecessary power in normal situations, and only in emergencies can the valve be closed quickly using the pump's self-pressure water, etc. Therefore, it is possible to obtain a valve opening/closing operating device that requires less operating force, has a small device, and does not need to be operated against an emergency force, which ensures stable operation. It has excellent effects.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the device of the present invention, and Figure 2 is its A.
-A cross-sectional view as seen from the arrow, FIG. 3 is the same B-B cross-sectional view as seen from the arrow,
FIG. 4 is a partial sectional view showing another embodiment, and FIGS. 5 and 6 are explanatory views of the operation of the device of the present invention. DESCRIPTION OF SYMBOLS 1... Valve body, 2... Valve stem, 3... Valve, 4... Opening/closing lever, 4a... Fork-shaped groove, 5... Drive shaft, 5a... Spline, 5b... Screw, 6...
Fixed case, 7... Worm gear case, 8...
Coupling case, 9...Cylinder, 10...Worm wheel, 11...Worm, 12...Bearing, 1
3...Crosshead, 13a...Protrusion, 14...
Piston, 15... Piston rod, 15a...
Female thread, 16, 17...Port, 18...Four-way switching valve, 19...Pump's own pressure water supply source, 20...
Opening/closing valve, 21...atmosphere, 22...orifice, 2
3...Limit switch, 24...Spring.

Claims (1)

[Scope of utility model registration request] In a rotary valve that controls opening and closing of a fluid passage by a valve 3 so as to be able to rotate inside a valve body 1, an opening/closing lever 4 having a fork-shaped groove 4a is fixed to a valve shaft 2 that drives the valve 3, and the fork-shaped groove A drive shaft 5 is rotatably provided at the center of a drive shaft 5 through a bearing 12, which rotates a crosshead 13 in forward and reverse directions, and a spline 5a provided on one side of the drive shaft 5 is connected to a worm. It is fitted with the wheel 10 and rotated by the worm 11, and a screw 5b is provided on the other side of the drive shaft 5,
A piston 14 having a rotatable hollow piston rod 15 having a female thread 15a which is screwed into the piston rod.
is provided in the cylinder 9, and the port 1 of the cylinder 9
A four-way switching valve 18 is provided between the operating pressure source and the four-way switching valve 18, and in normal times the valve 3 is opened and closed via the worm gear mechanisms 10 and 11, and in an emergency, the four-way switching valve 1
8. A valve opening/closing operating device characterized in that the valve 3 is suddenly closed via the piston mechanisms 9 and 14 by switching the valve 8.