JP2000346234A - Opening/and closing device for rotary valve having subvalve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To selectively rotate main and subvalve shafts with one operating shaft by having a self-rock system except for a gear system. SOLUTION: This device is rotatably provided with a screw shaft 11 orthogonal to valve shaft 3, 5 in a casing fixing a valve box, and externally operates to rotate the screw shaft 11 so as to axially move a slide block 16 screwed into the screw shaft 11. The slide block 16 and the main/subvalve shafts 3, 5 are respectively united by a scotch yoke system. With moving of the slide block 16, the main valve 3 opens after opening of the subvalve 5 according to position relationship between yoke grooves 24, 25 and rollers 26, 27 of the scotch yoke system. An opening/and closing position thereof is controlled by stoppers 30a, 30b, 31a, 31b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device for a rotary valve with a sub-valve, in which a sub-valve is provided at the center of a main valve and both valves are rotated by one operating shaft to open and close the valve. Things.

[0002]

2. Description of the Related Art A rotary valve with an auxiliary valve will be described with reference to FIGS. 1 to 8 which show an embodiment of the present invention. A main valve body 2 is provided in a valve box 1 and a main valve shaft 3 is provided. In addition to leading the valve body 1 to the outside, a sub-valve 4 is provided at the center of the main
Through the main valve shaft 3, and the main and sub valve shafts 3, 5
Is selectively rotated to selectively rotate the main valve body 2 and the sub-valve element 4 to open and close the valve.

For example, as shown in FIG. 4A, the valve V is completely closed by closing both valve bodies 2 and 4, and when the valve is opened, first, as shown in FIGS. The sub-valve 4 is opened, and then the main valve 2 is opened as shown in FIGS. At the time of opening, the main valve body 2 can be easily opened by opening the auxiliary valve body 4 in advance (see FIG. 6A). On the other hand, when the valve is closed, first, the main valve body 2 is closed while the sub-valve element 4 is open, and then the sub-valve element 4 is closed (valve fully closed). At this time, since the main valve is closed while the sub-valve is open, the water hammer pressure is greatly reduced even if the valve is rapidly closed. Also,
Fine adjustment of the flow rate can be performed depending on the degree of opening and closing of the sub-valve.

In many of the rotary valves with a sub-valve, the main valve body 2 and the sub-valve body 4 are respectively rotated by different operation shafts. The technology (valve opening / closing device) performed by shaft is patent No. 26553.
No. 80 and the like. The valve opening and closing device is
The intermittent engagement of the toothless gear causes the main and sub valves to open and close, and also performs self-locking.

[0005]

The conventional valve opening / closing device using a single operating shaft described above finely adjusts a series of specified operations of the main valve body 2 and the sub-valve 4 by using the sub-valve shaft 5 and the Ohira for the sub-valve. The adjustment is performed with an adjustment ring provided at the joint with the gear. For this reason, if an excessive load acts on the adjustment ring due to secular change due to long-term use or foreign matter biting into the sub-valve, the set positions of both valve bodies will change, and the main valve body 2 and the sub-valve will be changed. A series of prescribed actions of the body 4 are broken. In addition, when the teeth of the fully closed position locking function of the main valve body 2 are lost due to an excessive load, a series of specified operations of the main valve body 2 and the sub-valve body 4 are similarly broken.

Further, since the sub-valve 4 performs the same operation in conjunction with the main valve operation after the independent sub-valve operation, when the main valve is fully opened, the sub-valve is also fully opened and projects into the water flow. The pressure loss when fully opened increases. In addition, when water leaks from the sub-valve, it is not possible to easily adjust the fully closed position of the sub-valve element 4 from the outside to stop water from a structural aspect due to the engagement.

[0007] It is an object of the present invention to enable a main valve shaft and a sub-valve shaft to be rotated by one operating shaft with a self-locking function without using a gear mechanism.

[0008]

In order to solve the above-mentioned problems, the present invention firstly moves a slide block screwed into a screw shaft by rotating a screw shaft serving as an operation shaft. The movement is transmitted to the main and auxiliary valve shafts to obtain a self-locking function. In this way, with the screw-in structure, even if the main and sub valve shafts try to rotate, the slide block cannot move, and self-locking is performed.

Next, in the present invention, the transmission of the force from the slide block to the main and sub-valve elements is achieved by a Scotch and yoke mechanism. Scotch and yoke mechanisms can convert linear motion into rotary motion. Therefore, the linear movement of the slide block can be converted to the rotation of the main and sub valve shafts.

[0010]

As an embodiment of the present invention, a sub-valve is provided at the center of a main valve, and a sub-valve of the sub-valve is passed through a main valve shaft of the main valve. In the opening / closing device for a rotary valve with a sub-valve for selectively rotating the main valve body and the sub-valve body by selectively rotating both valve shafts, a casing fixed to a valve box is provided with a screw in a direction orthogonal to the main valve shaft. A shaft is rotatably provided around its axis, a slide block is screwed into this screw shaft so as to be movable in the axial direction, and the slide block and the main / sub valve shaft are connected by a Scotch / yoke mechanism. The mechanism comprises a horizontal main yoke and a sub yoke provided on the main valve shaft and the sub valve shaft, respectively, and a slider on the slide block slidably fitted in grooves of both the yokes. The grooves on both yokes are each bent in the shape of a letter. When the main and sub-valve elements are fully closed, the grooves of both yokes are respectively connected to the screw shaft from the main and sub-valve shaft sides in the valve closing rotation direction of the valve shaft. And the groove of the main valve yoke extends in the axial direction of the screw shaft, and the groove of the sub valve yoke extends in the direction perpendicular to the screw axis. The valve slider is located in the axial groove remote from the bending point of the groove, and the sub-valve slider is located at the bending point of the groove. When the main and sub-valve elements are fully opened, the main valve The slider is located at the bending point of the groove, and the auxiliary valve slider is located in the groove in the orthogonal direction away from the bending point of the groove, and by rotating the screw shaft from outside the casing, Move the slide block, and move it More may be adopted a configuration in which by rotating the main and auxiliary valve shaft to selectively rotate the main valve body and the sub-valve body.

With this configuration, when the screw shaft is rotated in the valve opening direction after the valve is fully closed, both sliders on the slide block move as the slide block moves. In this movement, since the groove of the auxiliary valve yoke is inclined 45 degrees in the valve closing rotation direction, the auxiliary valve yoke rotates while the slider slides in the groove as the slider at the bending point moves. As a result, the sub-valve shaft rotates and the sub-valve is opened. On the other hand, the groove of the yoke for the main valve extends in the axial direction of the slide block, and the slider for the main valve is located in the groove. No torque is applied.

When the sub-valve yoke rotates 90 degrees to open the sub-valve, the groove in the orthogonal direction of the sub-valve yoke extends along the axial direction of the slide block (screw shaft), and thereafter, the slider moves in the groove. It does not apply any rotational force to the auxiliary valve yoke only by sliding. That is, the open state of the sub-valve is maintained.

On the other hand, when the slider for the main valve reaches the bending point of the groove of the yoke for the main valve, the yoke for the main valve is rotated while sliding in the groove, the main valve shaft rotates, and the main valve body is opened. Is done. At this time, the point at which the groove of the main valve slider reaches the bending point is
If it is the same as or later than the time when the sub-valve is fully opened,
The main valve body shifts to the opening operation after the sub-valve body is fully opened. Before that, the opening operation is started during the opening operation of the sub-valve. Therefore, the length of the groove in the axial direction may be appropriately determined in consideration of the action,
If the operations of the main valve and the sub-valve are overlapped, it is possible to shorten the time required for opening and closing and to reduce the number of rotations of the opening and closing device. Also, the length of the groove in the orthogonal direction of the sub valve yoke is set to an appropriate length capable of absorbing the moving amount of the main valve slider when the main valve is opened.

When the main valve is opened, the sub-valve does not move. Therefore, when the valve is fully opened, the sub-valve fits in the main valve (the sub-valve is fully closed). The body does not protrude into the water stream and cause a large pressure drop. The valve fully closing operation is performed by the reverse operation of the above by operating the screw shaft in a reverse rotation operation.

In this operation, it is preferable to regulate the position of the main valve and the sub-valve when they are fully opened or fully closed. For example, a stopper for fully opening and fully closing the valve between the casing and the main valve shaft and the sub-valve shaft. The stopper is screwed into the casing and comes into contact with the projections of the two yokes to determine the fully open position and the fully closed position of the valve.

As described above, the operation of opening and closing the valve by rotating the yoke projecting laterally from the valve shaft requires only a small valve shaft rotating torque. For example, in the case of a butterfly valve, the valve is opened and closed. It has characteristics similar to shaft torque,
The operating force or the operating torque is reduced. Also, Scotch
Since the power is transmitted by the yoke mechanism and the screw, it has a self-holding (self-locking) function that prevents the valve from closing itself. In addition, since power is transmitted by screws, changing the screw lead can easily increase or decrease the valve shaft rotation speed for one rotation of the screw shaft, has a self-locking function at an intermediate opening, and provides flow and pressure Adjustments are possible.

[0017]

1 to 9 show an embodiment of a butterfly valve device with a built-in sub-valve, in which a main valve body 2 is provided in a valve box 1 provided in a pipeline. Connect the main valve shaft 3 to the valve box 1
An auxiliary valve body 4 is provided at the center of the main valve body 2, and the auxiliary valve shaft 5 penetrates the main valve shaft 3. In the figure, 6 is a main valve seat and 7 is a sub valve seat.

A casing 10 of the opening / closing device A is bolted to the upper surface of the valve box 1, and the main and sub valve shafts 3, 5 described above reach this casing 10. In the casing 10,
A screw shaft 11 in a direction orthogonal to the main valve shaft 3 (sub valve shaft 5) is rotatably bridged via a bearing 12, and the screw shaft 1
One end of 1 is an input shaft (operation shaft) via a bevel gear mechanism 13
14 and the operation shaft 14 is connected to the cap 15
, The screw shaft 11 rotates. A slide block 16 is screwed into the screw shaft 11, and pins 17 and 17 are provided on the upper and lower surfaces of both ends of the slide block 16, respectively.
A projection 18 is provided. These pins 17, 18
Are provided with guide rollers 17a and 18a, and these rollers 17a and 18a are fitted in guide grooves 17b and 18b parallel to the screw shaft 11 on the inner surface of the casing 10.
For this reason, when the screw shaft 11 rotates, the rollers 17a, 1
The slide block 16 moves in the axial direction of the screw shaft 11 via the guide groove 8a and the guide grooves 17b and 18b.

Rotating bosses 20 and 21 are fitted to the main valve shaft 3 and the sub-valve shaft 5 via keys, respectively. It is provided to protrude in the direction. The main valve rotation boss 20 is rotatably fitted to the casing 10 via a bearing 20a,
The auxiliary valve rotation boss 21 is rotatably fitted to the main valve rotation boss 20 and the casing 10 via bearings 21a and 21b.

The two yokes 22 and 23 have a U-shaped groove 24,
Rollers (sliders) 26 and 27 fitted to the pins 17 and 18 of the slide block 16 are slidably fitted in the grooves 24 and 25, respectively.
The two yoke grooves 24 and 25 have opposite letter shapes, and in the fully closed state of the valve, as shown in FIG. 45 degrees with respect to the screw shaft 11 in the direction
After that, the main valve yoke groove 25 is
The auxiliary valve yoke groove 26 extends in a direction perpendicular to the screw shaft 11 while extending in the axial direction of the screw shaft 11. At this time,
The main valve roller 26 is located in the axial groove 24 distant from the bending point 24 a of the groove 24, and the sub valve roller 27 is positioned at the bending point 25 a of the groove 25. In the fully opened state, the main valve roller 26 is located at the bending point 24a of the groove 24 and the sub valve roller 27 is positioned at the bending point 2 of the groove 25, as shown in FIG.
5a, and is located in the groove 25 in the orthogonal direction, which is separated from the groove 5a.

Rotation stoppers 30a, 30b, 31a and 31b for the main valve shafts 3 and 5 are threaded through the casing 10 from the outer surfaces thereof. As shown in FIGS. Projections 3 of yokes 22, 23
2a, 32b, 33a, 33b abut,
Further rotation of the valve shafts 3 and 5, that is, the fully open and fully closed positions of the valve bodies 2 and 4 are regulated. Therefore, by adjusting the screwing amount of each stopper, the fully open and fully closed positions of the valve bodies 2 and 4 can be independently adjusted from the outside. In the figure, stoppers 30a and 31a, 30b and 31b
Are vertically stacked.

This embodiment is constructed as described above. Next, its operation will be described with reference to FIGS. 4 to 9. When fully closed, as shown in FIG. And the auxiliary valve yoke groove 2
5 extends in a direction perpendicular to the screw shaft 11 and is a roller 2 for the main valve.
6 is located in the axial groove 24 distant from the bending point 24 a of the groove 24, and the auxiliary valve roller 27 is positioned at the bending point 25 a of the groove 25.

When the screw shaft 11 is rotated in the valve opening direction from the fully closed state of the valve, the rollers 26 and 27 on the slide block 16 also move as the slide block 16 moves. In this movement, since the auxiliary valve yoke groove 25 is inclined 45 degrees in the valve closing rotation direction, as shown in FIGS. 4 and 5, the roller 27 is moved along the movement of the roller 27 at the bending point 25a. While sliding inside, the auxiliary valve yoke 23 rotates to rotate the auxiliary valve shaft 5, and the auxiliary valve body 4 is opened as shown in FIG. On the other hand, the main valve yoke groove 24 is
Since the main valve roller 26 extends in the groove 24, the roller 26 only slides in the axial groove 24 and does not apply a rotational force to the main valve yoke 22.

When the sub-valve yoke is rotated by 90 degrees and the sub-valve is opened (the state shown in FIG. 6), the groove 25 in the orthogonal direction of the sub-valve yoke 23 extends in the axial direction of the slide block 16 (screw shaft 11). 7, the roller 27 only slides in the groove 25 and does not apply a rotational force to the sub-valve yoke 23. That is, the open state of the sub-valve is maintained.

On the other hand, as shown in FIG.
When 6 reaches the bending point 24a of the main valve yoke groove 24, the main valve yoke 22 is rotated while sliding in the groove 24,
The main valve shaft 3 rotates, and the main valve body 2 is opened as shown in FIG. When the valve is fully opened, the main valve roller 26 is in contact with the groove 2.
4, and the auxiliary valve roller 27 is located in the groove 25 in the orthogonal direction, away from the bending point 25a of the groove 25.

When the screw shaft 11 is turned in the opposite direction from the fully opened state of the valve, the valve is fully closed as shown in FIG. 4 through the states shown in FIGS. 8 → 7 → 6 → 5 by the above-described reverse action. The above operation is shown in FIG.

[0027]

According to the present invention, the main valve shaft and the sub-valve shaft can be rotated by one operating shaft without using a gear mechanism. Therefore, special processing such as gear processing is unnecessary, and the invention is inexpensive. Becomes In addition, since it has a self-locking function, a self-locking mechanism such as a worm speed reduction mechanism is not required.

[Brief description of the drawings]

FIG. 1 is a cutaway front view of one embodiment.

FIG. 2 is a cutaway plan view of the same.

FIG. 3 is an exploded perspective view of a main part of the embodiment.

4A and 4B show a state when the valve of the embodiment is fully closed, and FIG.
(B) is the operating state of the valve shaft opening / closing mechanism

5A and 5B show a valve opening operation state, in which FIG.
(B) is the operating state of the valve shaft opening / closing mechanism

6A and 6B show a valve opening operation state, in which FIG.
(B) is the operating state of the valve shaft opening / closing mechanism

7A and 7B show a valve opening operation state, in which FIG.
(B) is the operating state of the valve shaft opening / closing mechanism

8A and 8B show a state when the valve is fully opened, FIG. 8A shows a valve state, and FIG. 8B shows an operation state of a valve shaft opening / closing mechanism.

FIG. 9 is a diagram showing the opening and closing operation of the main valve and the sub-valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Main valve body 3 Main valve shaft 4 Sub-valve 5 Sub-valve shaft 10 Valve opening / closing device casing 11 Screw shaft 16 Slide block 22, 23 Yoke 24, 25 V-shaped groove 24a, 25a Groove bending point 26, 27 Roller (slider) 30a, 30b, 31a, 31b Stopper A Valve opening / closing device V Rotary valve with auxiliary valve

Claims (3)

[Claims] 1. A sub-valve (4) is provided at the center of a main valve (2), and a main valve shaft (3) of the main valve (2) penetrates a sub-valve (5) of the sub-valve (4). An opening / closing device A for a rotary valve V with a sub-valve for selectively rotating the main valve body 2 and the sub-valve element 4 by selectively turning the 3, 5 A screw shaft 11 in the direction orthogonal to the main valve shaft 3 is rotatably provided around the axis thereof, and a slide block 16 is screwed into the screw shaft 11 so as to be movable in the axial direction, and the screw shaft 11 is rotated from outside the casing 10. By operating, the slide block 16 is moved, and by the movement, the main / sub valve shafts 3 and 5 are rotated to selectively rotate the main valve body 2 and the sub-valve body 4. apparatus. 2. A scotch-and-yoke mechanism converts the linear movement of the slide block 16 into rotation of the main and sub-valve shafts 3 and 5, and the scotch-and-yoke mechanism comprises the main valve shaft 3 and the sub-valve shaft. 5 includes a main yoke 22 and a sub-yoke 23 in the lateral direction, and sliders 26 and 27 on the slide block 16 slidably fitted in grooves 24 and 25 of the yokes 22 and 23, respectively. hand,
The grooves 24, 25 of the two yokes 22, 23 are bent in the shape of a letter, and the two letters are reversed. When the valve is fully closed, the grooves 24, 25 of the two yokes 22, 23 are Each of the main and sub valve shafts 3 and 5 is inclined by 45 degrees with respect to the screw shaft 11 in the valve closing rotation direction of the valve shaft to the slide block 16, and thereafter the groove 24 of the main valve yoke 22 is connected to the screw shaft. 11, the groove 25 of the auxiliary valve yoke 23 extends in a direction orthogonal to the screw shaft 11,
The main valve slider 26 is located in the axial groove 24 away from the bending point 24a of the groove 24, and the sub valve slider 27 is positioned at the bending point 25a of the groove 25. The main valve slider 26 is located at the bending point 24a of the groove 24 and the sub valve slider 27
The opening / closing device for a rotary valve with a sub-valve according to claim 1, wherein the opening is located in the groove 25 in the orthogonal direction, away from the bending point 25 a of the groove 25. 3. A stopper 30a, 30 for fully opening and fully closing the valve between the casing 10 and the main valve shaft 3 and the auxiliary valve shaft 5.
b, 31a, 31b, respectively, and this stopper is screwed into the casing 10 to abut on the projections 32a, 32b, 33a, 33b of the yokes 22, 23 to determine the fully open position and the fully closed position of the valve. The opening / closing device for a rotary valve with a sub-valve according to claim 2.