JPS5843608B2 - actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an actuator, which has a simple structure in which a valve portion is provided at an appropriate position on a piston, and the piston is driven by a driving fluid supplied into a cylinder and slides a predetermined distance. It is an object of the present invention to provide an actuator configured to discharge driving fluid to the outside of the cylinder via the valve portion when the piston is displaced and reaches the sliding limit position, thereby allowing the return operation of the piston to be performed easily and safely.

In general, emergency drive actuators such as emergency shutoff valves supply high-pressure gas or liquid drive fluid into a cylinder in an emergency, drive a piston at high speed, and work in conjunction with the piston to open or close a ball valve, etc. at high speed. For example, when an actuator that has been activated due to an emergency situation such as an earthquake or fire is to be returned to its original state, the driving fluid supplied into the cylinder may be provided on the outer wall of the cylinder before the return operation. It was necessary to open a manual valve, etc. to release the water to the outside.

For this reason, especially when the driving fluid is gas, if you neglect to release the gas and carelessly remove the driving part from the cylinder while the high-pressure gas is still inside the cylinder, the high-pressure gas will instantly leak out to the outside. This has the disadvantage that it can be released and become extremely dangerous, leading to personal injury in extreme cases.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

FIG. 1 shows a schematic diagram of an embodiment of the actuator of the present invention.

Reference numeral 1 denotes an emergency opening/closing valve, which is composed of a valve part 3 such as a ball valve installed in a pipe 2, a valve shaft 4, etc., and the valve shaft 4 is rotated by a drive part 6 driven by a drive source 5, which will be described later. It is connected to arm 10.

The drive unit 6 roughly consists of a cylinder 7 and a piston 8 fitted into the cylinder 7 so as to be slidable within a predetermined area.
According to the sliding displacement of the valve shaft 4, the valve shaft 4 is rotated about its axis via the rod 9 and the rotary arm 10, and the valve portion 3 is accordingly opened and closed.

Further, the piston 8 is restricted in its sliding limit positions by a pair of stopper steps 7a and 7b formed at predetermined positions on the inner wall of the cylinder 7, and the stopper steps 7a and 7
A recess 8 that is slidable between b and bored on the outer peripheral surface of the recess 8
The internal space of the cylinder 7 is defined into a pair of fluid spaces 11 and 12 in an air-liquid tight manner by the 0-IJ song b fitted into the cylinder a.

Reference numeral 13 denotes a conduit attached to the outer wall of the cylinder 7, which communicates the fluid space 11 with the outside via a manual valve 13a attached to the tip thereof.

The drive source 5 includes a drive source main body 14 in the form of a square hollow casing, a plunger solenoid mechanism 15 mounted and fixed on the top surface of the main body 14 covered with a case 30 having a pressure-resistant and explosion-proof structure, and a bottom wall of the main body 14. It consists of a gas cylinder 21, etc., which is removably screwed into a hole 16 formed in the hole 16.

The drive source main body 14 is attached to the cylinder 7 using a mounting member 17.
The fluid space 27 therein communicates with the fluid space 12 of the cylinder 7 via the communication pipe 28, and the manual valve 29a is attached to the pipe line 29 and its tip.
The fluid space 27 communicates with the outside via.

Reference numeral 19 denotes a pin that is airtightly inserted into the bottom of a recess 18 formed in the upper center of the drive unit main body 14, and one end of which is coaxially fitted and fixed into the lower end of the plunger 15a of the plunger solenoid mechanism 15. Solenoid 15b
In response to excitation, the pin 19 slides in the directions of arrows A and B in the figure.

20 is a coil spring fitted between the flange 19a of the pin 19 and the bottom surface of the recess 18, and the pin 19 is connected to the arrow A.
It's pushing in the direction.

The gas cylinder 21 is a hollow cylindrical container 2 with an open end.
A high-pressure gas generator 21a is press-fitted into the interior of the container 22, and a stopper 24 whose one end is closed by a lubricant disc 23 as a sealing member is screwed into the opening of the container 22 in an airtight and irremovable manner. It is fitted into the through hole 16 of the drive source main body 14 to airtightly close the fluid space 27.

Here, the high-pressure gas generator 21a is compressed air that is in a gaseous state when sealed in the gas cylinder 21, etc.
It also contains liquefied nitrogen gas, liquefied carbon dioxide gas, etc. in a liquid state, and dry ice, etc. in a solid state, and when the stopper 24 is opened, high-pressure gas is generated for a predetermined period of time.

Reference numeral 25 denotes a hollow cylindrical cylinder case with one end open, which is screwed onto the outer peripheral wall of a ring-shaped protrusion 26 formed on the lower wall of the drive source main body 14 to protect the cylinder 21.

Reference numeral 31 designates a valve portion, which has a through hole 3 axially drilled through the piston 8 at a predetermined location to communicate the fluid spaces 11 and 12.
2, a valve body 33, and a coil spring 34.

The through hole 32 is inserted into the hole portion 3 from the right side in the figure as shown in FIG. 2A.
2a.

It is formed by three stages of holes 32b and 32c.

The valve body 33 is generally formed of a valve body 33a that is fitted and inserted into the large diameter hole 32b, and a shaft portion 33b that is loosely inserted into the small diameter hole 32c, and is housed in the hole 32b. The valve seat 3 is normally biased in the direction of arrow C by the coil spring 34 and buried in the left end surface of the valve body 33a.
3c is seated on the valve seat 32d of the protrusion on the right end surface of the hole 32c, and the valve is closed.

As a result, the fluid space 12 is normally closed.

Also, at this time, the shaft portion 33b of the valve body 33 protrudes from the left end surface of the piston 8 by a distance l necessary to sufficiently separate the valve body 33a from the valve seat 32d during operation, which will be described later.

Furthermore, as shown in FIG. 2B, the valve body 33a has a shape in which a portion of its upper and lower portions are removed, so that a pair of upper and lower passages 32e are formed between the valve body 33a and the inner circumference of the hole 32b. ing.

Next, the operation of the above-mentioned component device will be explained.

The valve portion 3 is normally open, and the fluid supplied into the pipe 2 flows from the upstream side to the downstream side via the valve portion 3.

At this time, the piston 8 is at the right sliding limit position in the figure, and the volume of the fluid space 12 is at its minimum.

Further, above the opening of the stopper 24 of the gas cylinder 21 attached to the drive source main body 14, the tip of the pin 19 is located facing and spaced apart by a distance approximately equal to the amount of sliding displacement of the plunger 15a.

Since the manual valve 13a is always opened with an appropriate valve opening degree, the fluid space 11 communicates with the outside via the manual valve 13a and the pipe 13, and the piston 8 slides in the left direction in the figure. With the displacement, the air in the space 11 is in a state of being exhausted to the outside.

On the other hand, since the manual valve 29a of the conduit 29 that communicates the fluid space 27 of the drive source main body 14 with the outside is closed when the gas cylinder 21 is installed, the fluid space 12 of the cylinder 7 is communicated with this. Both fluid spaces 27 are closed.

Now, while the valve part 3 is fully opened and fluid is being supplied into the pipe 2 as described above, the valve part 3 is urgently closed due to an abnormality in the gas pipe, etc. on the upstream or downstream side of the valve part 3. Suppose the need arises.

At this time, when the abnormality is discovered, the solenoid 15b is energized and energized manually or automatically.

As a result, the plunger 15, which had been at the upper limit of movement,
A is slidably displaced at a high speed in the direction of arrow B in the figure with the above-mentioned energization.

As a result, the pin 19 is also slidably displaced together with the plunger 15a in the direction of arrow B against the spring 20, and its tip penetrates the lubricant disk 23 of the plug body 24 to form a through hole therein.

Since the solenoid 15b is energized instantaneously for a predetermined period of time, when the energization is removed, the solenoid 15b is demagnetized and the plunger 15a and pin 19 are slid in the direction of arrow A by the restoring force of the spring 20, returning to the state shown in the figure. .

As a result, the gas generated from the high-pressure gas generator 21a filled in the container 22 is transferred to the Labucha disk 2.
The fluid is discharged into the fluid space 27 of the drive source main body 14 through the through hole formed in the drive source main body 14 .

At this time, the pressure of the gas generated by the high-pressure gas generator 21a is extremely high, so the fluid space 12 of the cylinder 7 communicating with the fluid space 27 is instantly filled with high-pressure gas, and the pressure of this gas causes the piston 8 slides at high speed to the leftward sliding limit position shown by the dashed line in the figure.

Then, as the piston 8 slides, the rotary arm 10 rotates at high speed together with the valve shaft 4 to the counterclockwise rotation limit position shown by the dashed line in the figure, and the valve portion 3 is closed in an emergency manner. The fluid supply in the pipe 2 is cut off.

At this time, the volume of the fluid space 11 of the cylinder 7 gradually decreases with the sliding displacement of the piston 8.
The air inside is discharged to the outside via the pipe line 13.

On the other hand, when the piston 8 is displaced to the sliding limit position on the left side in the figure, the shaft portion 33b of the valve body 33, which has been protruding a distance l from the left end surface of the tip stone 8 in the valve portion 31, as shown in FIG. The piston 8 is moved with its tip abutting against the stopper step 7a.
It is pushed in the direction indicated by the arrow in the figure.

Therefore, the valve body 33 resists the biasing force of the coil spring 34 and moves a distance l in the direction of the arrow in the figure relative to the piston 8.
As a result, the valve seat 33c is moved away from the valve seat 32d by the distance l, and the valve body 33 is opened.

Therefore, the high pressure gas in the fluid space 12 is removed from the valve portion 31.
Hole 32a1 Hole 32b1 Passage 32e1 Hole 3
It is supplied into the fluid space 11 through the pipe 2c, and is further discharged to the outside through the pipe line 13.

Therefore, as the loveture disk 23 is damaged and all the high-pressure gas generated by the high-pressure gas generator 21a at predetermined time intervals is released to the outside, the pressure within the fluid space 12 decreases until it becomes approximately equal to atmospheric pressure.

The sliding speed of the piston 8 can be arbitrarily adjusted by setting the opening degree of the manual valve 13a and the cross-sectional area of the conduit 28 to appropriate values in advance.

Here, after the valve portion 3 is closed in an emergency to avoid an emergency situation, appropriate follow-up measures are taken and the manual valve 29a is opened.

At this time, the high pressure gas supplied into the fluid spaces 12 and 27 has already been released to the outside and the pressure inside the rain spaces 12 and 27 is approximately atmospheric pressure, so when the manual valve 29a is opened, the fluid spaces 27 High-pressure gas will not blow out from inside and cause unnecessary disaster.

After opening the manual valve 29a and communicating the fluid space 27 with the outside, the valve shaft 4 of the valve part 3 is forcibly rotated from the outside, and the arm 10 is rotated to the position before rotation shown by the solid line in the figure. The valve section 3 is automatically returned to open position.

When opening the valve part 3, instead of using the above method, gas at an appropriate pressure is allowed to flow into the fluid space 11 from the outside through the manual valve 13a1 pipe 13, and this gas pressure causes the piston 8 to slide to the right. It may be slidably displaced to the limit position.

After opening the valve part 3, the cylinder case 25 is removed from the lower surface of the drive source main body 14 and the used cylinder 21 screwed into the through hole 16 is replaced with another unused cylinder.

At this time, as in the valve opening operation described above, the pressure of the gas in the fluid spaces 12 and 27 is equal to the atmospheric pressure, so when the cylinder case 25 is removed from the drive source main body 14, high pressure gas is blown out from the fluid space 27 to the outside. It will not lead to unnecessary disasters.

In the above embodiment, the sliding limit position of the piston 8 on the left side in the figure can be arbitrarily set by changing the position of the stopper stepped portion 7a, and therefore the valve opening degree of the valve portion 3 can be freely set. This can be set to

Further, in the above embodiment, the valve body 33 in FIG. 2A is composed of only the valve body 33a, and its shaft portion 33b is located at a position corresponding to the through hole 32 of the piston 8 on the right side surface of the stopper step portion 7a. By providing the integral structure, when the piston 8 slides, the right end surface of the shaft portion 33b comes into contact with the left end surface of the valve body 33a, causing the valve body 33a to move relative to the piston 8. It may be made to slide a distance l in the direction indicated by the arrow in the figure.

Further, as the driving source 5, a cartridge type gas cylinder 21 is used.
It is not limited to the one that uses the power source, but other pneumatic sources, hydraulic power sources, etc. may also be used. In this case, a normally closed on-off valve is provided in the communication pipe 28 that connects the drive source 5 and the drive section 6. The on-off valve may be opened in an emergency by an emergency external signal, and the driving fluid may be supplied from the air pressure source or the like into the fluid space 12 for the time required to displace the piston 8 to its sliding limit position. good.

Further, the driven parts driven by the drive part 6 are not limited to the emergency on-off valve 1, but may also include an emergency water injection device for stopping the reaction of a nuclear reactor, and an emergency opening device for an evacuation door installed at an evacuation exit of a building facility. , a fire protection shutter lifting device, etc.

As described above, the actuator of the present invention includes a driving section consisting of a cylinder and a piston fitted inside the cylinder and slidable a predetermined distance; a driving source that supplies a driving fluid to one of the fluid spaces to slide the piston a predetermined distance in the negative direction; and means for communicating the other fluid space of the pair of fluid spaces to the outside. , a valve part that is provided on the piston and communicates and shuts off the - fluid space in the cylinder with other fluid spaces, and when the piston opens, the driving fluid in the - fluid space is communicated with and shut off from other fluid spaces. Since the piston is configured to be released to the outside through the fluid space, only a small operating force is required to return the piston to the position before sliding because the pressure of the gas in the fluid space is low. ,
Furthermore, even when replacing a cartridge-type drive source such as a gas cylinder that has once been activated, the used drive source can be safely removed from the space without checking whether there is any residual gas in the fluid space mentioned above. It has features such as extremely easy and safe replacement of the drive source.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of an embodiment of the actuator of the present invention, Fig. 2A is a detailed view of section X in Fig. 1, and Fig. 2B is a diagram A of the same
FIG. 2 is a view along the YY line. 1... Emergency opening/closing valve, 3, 31... Valve section, 4... Valve stem, 5... Drive source, 6...
... Drive unit, 7... Cylinder, 7a, 7b
...Stopper step, 8...Piston,
'11.12,27...Fluid space, 20,34
... Coil spring, 21 ... Gas cylinder, 21a ... High pressure gas generator, 32a,
32b. 32c...hole, 32d...valve seat, 3
2e...Passage, 33...Valve body, 33a
... Valve body, 33b ... Shaft part, 33c
...Valve seat.

Claims (1)

[Claims] 1. A driving section consisting of a cylinder and a piston fitted inside the cylinder and slidable a predetermined distance, and - of a pair of fluid spaces defined by the inner wall of the cylinder and both end surfaces of the piston when operation is required. a driving source for supplying a driving fluid to the piston and slidingly displacing the piston by the predetermined distance in the - direction; a means for communicating the other fluid space of the pair of fluid spaces with the outside; The valve part is configured to communicate and cut off the - fluid space and other fluid spaces in the cylinder, and the valve part opens when the piston is slidably displaced by the predetermined distance by the driving fluid. - An actuator characterized in that the actuator is configured to discharge the driving fluid in the fluid space to the outside through another fluid space.