JPH0325480Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention applies fluid pressure to one side of a piston that reciprocates in sliding contact with the inner wall of a cylinder, operates against the force of a spring, and moves the piston in a straight line. exercise,
Regarding rotary valves such as butterfly valves, which are equipped with a rotary actuator that converts the rotational movement of a drive shaft to which the yoke is attached by a yoke mechanism, the movement of the piston can also be operated manually. Relating to manual devices.

This device automatically opens and closes regular valves using fluid pressure, and is used during test runs of valves that have not yet been connected to the driving force for automatic operation, or when the automatic operation mechanism is disabled for some reason. In an emergency, the valve can be opened and closed manually by switching to manual operation.

(Prior Art) Conventionally, in a single-acting cylinder, fluid pressure such as hydraulic or pneumatic pressure is input from one side of the piston, and when the fluid pressure is lost, the fluid pressure is returned to the original state by the force of a spring. Manual devices are known which actuate against a spring even without a spring. (Showa 60-
(Refer to Publication No. 8501) In this device, the piston has a hollow part formed by an intermediate rib, a yoke is attached to a drive shaft provided through the hollow part, and the yoke and piston are connected to each other by a pin ( When opening the valve body of a rotary valve connected to the drive shaft, the piston is slid against a spring by fluid pressure and then closed. When the valve is activated, fluid pressure is lost and the force of the spring returns the piston to its original position. In addition, when operating the piston manually, a sliding cylinder provided in contact with the end surface of the piston facing the spring is moved forward and backward by a screw mechanism operated by the handle, and the piston is moved against the spring. It's summery.

FIG. 3 is a sectional view of a main part of the conventional single-acting cylinder as described above, and shows a yoke (clevis yoke) mechanism (not shown), that is, a piston engaged with a drive shaft via a yoke, a pin, and a clevis. 1 is fitted into a cylinder 2, the right end of the cylinder 2 in the figure is closed by a screw case 3, and the left end (not shown) has a spring that presses the piston 1 to the right in the figure. It is closed by the stored spring case.

A sliding cylinder 4 is inserted into the screw case 3 so as to be slidable in the axial direction, and a key groove 5 is carved in the outer circumference of the sliding cylinder 4 in the axial direction.
A columnar head 6a of a guide screw 6 screwed into the screw case 3 is inserted into the screw case 3, thereby preventing the sliding cylinder 4 from rotating.

Further, a female thread 4a is cut into the inner circumference of the sliding cylinder 4, and a tip 8 of a threaded rod 7 that is screwed into the female thread 4a protrudes from the screw case 3, and a handle 9 is fixed thereto.

During normal operation, the left end 7a of the threaded rod 7 is recessed into the sliding cylinder 4, and the left end 4a of the sliding cylinder 4 is in contact with the right side wall surface of the piston 1. Further, the sliding cylinder 4 is supported by a collar 11 provided on the threaded rod 7 in the screw case 3 and a bearing 12. In addition, in the figure, 10a and 10b are fluid passages bored in the cylinder 2 and the screw case 3, respectively, for introducing pressure fluid into the cylinder chamber 2a.

With the above configuration, the fluid pressure in the cylinder chamber 2a is connected to the return flow path and is lost.
The piston 1 is moved by a left spring (not shown).
When the piston 1 is pressed to the right, the piston 1
It occupies the rightmost position as shown in the figure. Note that this position indicates the fully closed position of the valve.

Next, when pressure fluid was introduced into the cylinder chamber 2a from the fluid passages 10a and 10b, the piston 1 moved to the left against a spring (not shown), rotated the drive shaft in the valve opening direction, and eventually moved to the leftmost position. occupy a position. This position represents the fully open position of the valve.

Also, when manually moving piston 1 to the left,
The handle 9 is used to turn the threaded rod 7, and the sliding cylinder 4, which is threaded with the threaded rod 7, is moved to the left, and the piston 1 is directly pressed by its end surface 4a to move it to the left.

(Problems to be Solved by the Invention) In the above-mentioned conventional manual rotary valve device, as shown in FIG. Since the sliding cylinder 4 is supported by the collar 11 of the threaded rod 7 in the screw case 3 and the bearing 12, its position is fixed.

That is, when the sliding cylinder 4 is manually operated by the handle 9, it is moved as far as possible to the right by the handle 9 as shown in the figure, but its position is determined by machining. Therefore, fine adjustment of the valve's fully closed position cannot be made. As a result, the following problems arose.

(i) It cannot be used for valves that require a severe fully closed adjustment position, such as metal touch valves.

(ii) It is also impossible to use a rubber seat valve that can reduce torque by setting it at a position (angle) just short of the fully closed position.

The technical problem of the present invention is to solve the above-mentioned problems, to make it possible to variably adjust the end position of the piston with a simple structure and operation, and to make it possible to adjust the fully closed angle of the valve.

(Means for Solving the Problems) In order to solve the problems and technical problems of the prior art described above, the present invention provides a system in which a manually operable threaded rod is screwed onto the side of the piston facing the spring. One end of a sliding cylinder supported so as to be movable in the axial direction is provided in contact with the other end of the sliding cylinder, the other end of the sliding cylinder is brought into contact with the collar of the threaded rod, and the collar is further adjusted in the axial direction. It is characterized by being supported by a stopper.

(Function) Since the present invention is constructed as described above, the normal valve opening/closing operation involves introducing fluid pressure, that is, air pressure or oil pressure into the cylinder chamber to move the piston in the valve opening direction against the spring. Also, by releasing the fluid pressure in the cylinder chamber, the piston is moved in the valve closing direction by the force of the spring, and the valve is closed at the position where the end surface of the piston comes into contact with one end of the sliding cylinder at the most retracted position. Fully close. At this time, by adjusting the axial position of the stopper supporting the collar of the threaded rod, the retracted position of the sliding cylinder is changed, thereby adjusting the stopping position of the piston end surface. As a result, the fully closed angle of the valve can be adjusted.

On the other hand, during a test run of a valve where the driving force for automatic operation has not yet been connected, or in an emergency when the automatic operation mechanism is disabled for some reason, the sliding cylinder can be rotated manually by rotating the threaded rod. The valve is opened and closed by moving it in the axial direction and moving the piston, which is in contact with one end thereof, against the force of the spring. Note that this point is no different from the conventional one.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a vertical cross-sectional view of a rotary actuator for driving a rotary valve showing an embodiment of the present invention, and Fig. 2 is an enlarged cross-sectional view of main parts showing approximately the right half of Fig. 1. In the figure, the same reference numerals as those shown in FIG. 3 indicate the same or similar parts.

In FIG. 1, a piston 1 that slides on the inner wall of a cylinder 1 and moves reciprocatingly has a forked clevis 21 and a yoke 2 inserted into the forked part in the internal hollow part of the piston 1.
2 are engaged with each other by a pin 23 fitted into a yoke groove 22a, and a yoke mechanism is provided, and a drive shaft 24 connected to a rotary valve shaft is attached to the yoke 22. .

A stopper shaft 28 fixed to a disk 27 pressed by a spring 26 is in contact with the end surface of the piston 1 on the side opposite to the cylinder chamber 2a (left side in the figure). In the figure, 25 is a spring case;
Reference numeral 29 indicates an adjustment bolt for adjusting the retreating position of the stopper shaft 28, and 30 indicates a fluid passage hole. Note that these points are not particularly different from the conventional one.

In addition, in FIG. 2, a sliding cylinder 4 screwed onto a threaded rod 17 is inserted into a screw case 13 that closes the right end of the cylinder 2, and a columnar protrusion 6a of a guide screw 6 is fitted into a key groove 5, so that the sliding cylinder 4 is inserted in the axial direction. One end (left end) is supported movably only on the right end surface of the piston 1, and the other end (right end) is supported movably on the collar 11 of the threaded rod 17.
It is in contact with the Note that this point is also the same as the conventional one (Fig. 3).

In this embodiment, the collar 11 of the threaded rod 17 that supports the other end (right end) of the sliding cylinder 4 is supported in the right direction in the figure by a stopper 14 that is adjustable in the axial direction via a bearing 12. It is well received. The stopper 14 has a screw 14a carved on its outer circumference and a female screw 13a carved on the inner surface of the screw case 13, which are screwed together, and the screwed position of both screws is fixed by a lock nut 15. ) to be done.

According to this embodiment, the position of the sliding cylinder 4 can be changed by rotating the stopper 14 by _l2 dimensions in the left direction, that is, in the valve opening direction, and _l1 dimension in the right direction, that is, in the valve closing direction. It becomes possible. In this way,
The fully closed position of the valve body of the rotary valve is adjusted.

Therefore, it can be used for valves that require a strict fully closed adjustment position such as metal touch valves, and by setting it at a position (angle) slightly before the fully closed position, torque can be reduced. It is also possible to use rubber seat valves.

(Effects of the invention) As explained above, according to the invention, one end of the sliding cylinder is brought into contact with the piston end surface, and the other end is brought into contact with the collar of the threaded rod, so that the collar can be adjusted in the axial direction. By being configured to be supported by a stopper, by adjusting the axial position of the stopper, the position where the piston is most retracted by the force of the spring, that is, the fully closed position (angle) of the valve, can be adjusted clockwise. Fine adjustment can be made in the clockwise or counterclockwise direction.

Therefore, it can be used for valves that require a strict fully closed adjustment position such as metal touch, and it is also possible to reduce torque by setting the valve at a position (angle) slightly before the fully closed position. It also becomes possible to use a rubber seat valve.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a rotary actuator for driving a rotary valve showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part of Fig. 1, and Fig. 3 is a conventional rotary actuator. FIG. 2 is an enlarged sectional view of a main part similar to FIG. 1 of FIG. 1... Piston, 2... Cylinder, 2a... Cylinder chamber, 4... Sliding cylinder, 5... Keyway, 11
...Tsuba, 12...Bearing, 13...Screw case, 1
4...Stopper, 17...Threaded rod, 22...Yoke, 23...Pin, 24...Drive shaft, 26...Spring.

Claims (1)

[Claims for Utility Model Registration] 1. Fluid pressure is applied to one side of a piston that reciprocates in sliding contact with the inner wall of the cylinder, the piston is actuated against the force of a spring, and the linear movement of the piston is controlled by a yoke mechanism. In a rotary valve equipped with a rotary actuator that converts the rotational movement of the drive shaft to which the yoke is attached, the piston is screwed onto the side facing the spring and movable in the axial direction by a manually operable threaded rod. One end of the sliding cylinder supported by the screw rod is provided so as to be in contact with the other end of the sliding cylinder, and the other end of the sliding cylinder is brought into contact with the collar of the threaded rod, and the collar is further fixed with a stopper that is adjustable in the axial direction. A manual device for a rotary valve, characterized in that it is supported by. 2 The stopper stops the screw formed on the outer periphery.
The manual device for a rotary valve according to claim 1, which is slidable in the axial direction by screwing into a female thread formed on the inner surface of a screw case and rotating the stopper.