JPS5815738Y2 - Bentai Kaihei Souchi - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a comparatively small-sized valve body opening/closing device for butterfly valves, ball valves, and the like.

As a conventional device of this kind, one disclosed in Japanese Utility Model Publication No. 45-29507 is known, but this device (in this case, a rotating shaft is rotated by operating a handle, and Threaded actuating piece or attached to the actuating piece, the inclined slot of the sleeve and the vertical guide groove of the case)
By moving the engaged pair of guide pins up and down, the sleeve is converted into a rotational motion by the guide pin and the inclined groove hole, and as the sleeve is rotated, the valve shaft ( The connected valve body is designed to open and close, and the actuating piece or guide pin moves up and down (in this case, when the guide pin is positioned at one end or the other end of the inclined slot, the rotation axis The rotation of the valve body is prevented and the valve body is in the fully open or fully closed position.

In the above system, when the valve body reaches the fully open or fully closed position, the guide pin is positioned at one end or the other end of the inclined groove hole of the sleeve, and the rotation axis of the sleeve is blocked. When attempting to turn the valve, it was grasped by a load greater than the normal valve opening/closing force transmitted to the operator via the handle.

However, during the opening and closing of the valve body (for some reason), the rotation of the rotation shaft is prevented, and the above-mentioned load is applied to the operator I.
If this happens, the valve body has not reached the fully open or fully closed position1.
Regardless of this, the operator is in the fully open or fully closed position! Therefore, the fully open or fully closed position of the valve body cannot be accurately determined.
The problem was that it was not possible to grasp this.

Therefore, the technical problem of this invention is to be able to accurately grasp the fully open or fully open position of the valve body.

The technical means devised to solve the above technical problem are:
Vertical slots extending in the axial direction are provided at both ends of the inclined slot.

The operation of the above technical means is as follows.

When the rotation shaft is rotated by operating the handle, and the guide pin is moved up and down along the inclined groove hole of the sleeve that engages it and the vertical guide groove of the case (the sleeve that engages with the guide pin through the inclined groove hole) The valve body is rotated to open and close via the valve stem,
On the other hand, the guide pin gradually reaches the connection point between the slanted slot and the vertical slot, and as the rotation shaft continues to rotate, the slanted slot becomes engaged with the vertical slot.

When the guide pin engages with the vertical slot, although rotation of the rotation shaft is possible, the normal opening/closing force of the valve body acting on the rotation shaft suddenly decreases, and this rapidly decreased opening/closing force is transmitted to the operator via the handle, so the operator can easily understand when the valve body has reached the fully open or fully closed position.
If a load greater than the normal valve opening/closing force is applied to the operator during opening/closing of the valve body, this will confirm that the valve body has not yet reached the fully open or fully closed position. It is only necessary to continue rotating the rotation shaft, and therefore, there is no possibility of the operator having any illusions during opening and closing of the valve body as in the conventional system, and the valve body is extremely accurate.

This invention produces the following unique effects.

When the valve body is in the fully open or fully closed position, the guide pin engages from the inclined slot to the vertical groove, so after the valve body is fully opened or fully closed, it prevents the valve body from rotating due to the fluid in the pipe, ensuring a locked state. In addition, when the guide pin reaches one end or the other end of the inclined slot as in the conventional case, the guide pin is subjected to a load greater than the normal opening and closing force of the valve body due to the rotation of the rotation shaft. In addition to the fact that the guide pin does not wear out, the structure is simple, which facilitates the assembly work when assembling the valve.

Examples of this invention will be described below.

In FIG. 1, 1 is a valve shaft of a butterfly valve, etc., and a sleeve 2 is directly connected to its upper end.

The sleeve 2 has inclined slots 6, 6' at opposite positions in the upper part.
and a vertical slot 7a extending in the axial direction from both its upper and lower ends.
, 7b, 7'a, and 7'b.

3 is a rotation shaft, and a male thread 9 is formed at the bottom thereof.

13 has a female screw 14 that screws into the male screw 9, and the rotation shaft 3
This actuating piece 13 is movable in the axial direction.
are provided with guide pins 5, 5' which protrude in the radial direction at opposing positions on the outer periphery, and these guide pins 5, 5' are connected to the inclined slots 6, 6' and the vertical slots 7a, 7b,
7/a and 7'b, and their tips are slidably engaged with the vertical guide grooves 15° 15' formed at opposite positions of the hollow cylindrical case 4. ing.

Reference numeral 10 denotes a cap connected to the upper end of the rotating shaft 3, into which a handle (not shown) is fitted to rotate the rotating shaft 3.

Next, the operation of the above embodiment will be explained.

When the rotating shaft 3 is rotated using a handle or the like, the actuating piece 13 screwed onto the rotating shaft 3 is guided by the guide pins 5, 5' and the vertical guide grooves 15, 15', and moves up and down. At this time, since the sleeve 2, which is engaged with the guide pins 5, 5' through the inclined groove holes 6, 6', is rotated, the valve shaft 1, which is connected to the sleeve 2, is also rotated, and the valve is rotated. It opens and closes the body.

That is, the guide pins 5, 5' are connected to the lower ends I of the inclined slots 6, 6'.
When this position is reached, the valve body is fully open and the inclined slot 6 is opened.
, 6', the valve body is fully closed.

After this full opening or fully opening, when the rotation shaft 3 is rotated one more time in the fully opening or fully closing direction, the guide pins 5, 5' move from the inclined slots 6, 6' to the vertical slots 7b, 7'b. or γa,
At this time, since the vertical slot extends in the axial direction, only the actuating piece 14 moves in the axial direction, that is, in the vertical direction. (The normal opening/closing force of the valve body) suddenly disappears and a light torque is transmitted to the handle, so the reduction in torque allows the operator to easily grasp the fully open and fully closed positions of the valve body.

Moreover, the guide pins 5, 5' of the rotating shaft 3 are connected to the vertical slot 7a.
, 7b, 7'a, and 7'b, the force is applied only in the horizontal direction, and the force is not generated in the vertical direction (the rotation of the valve body is prevented because no force is generated that would cause the valve body to open or close. This ensures that the locked state is maintained.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of the embodiment, FIG. 2 is a cross-sectional view of the same, and FIG. 3 is a partial vertical cross-sectional front view of the sleeve. 1...Valve stem, 2...Sleeve, 3...
...Rotation axis, 4...Case, 5,5'...
...Guide pin, 6,6'...Slanted slot,
7a, 7b, 7'a, 7'b... Vertical slots.

Claims (1)

[Scope of utility model registration request] At the center of the case (when the rotating screw shaft is provided vertically), this rotating screw shaft F is screwed together with an operating piece that moves up and down by rotating the rotating screw shaft, A guide pin protruding in the radial direction is provided on the opposing outer periphery of the actuating piece,
The lower part of the rotary screw shaft (when the valve shaft is provided vertically (a sleeve is provided at the upper end of this valve shaft, and the guide pin is slidable on the opposing circumferential wall of this sleeve)) A vertical guide groove is provided on the opposing inner periphery of the case to slidably engage the guide pin protruding from the inclined groove, and the vertical movement of the actuating piece is controlled by the guide. In the valve body opening/closing device 1, which converts rotational motion into a rotational motion using a pin and an inclined slot and transmits it to a sleeve, and rotates a valve shaft provided with the sleeve, both ends of the inclined slot (vertical grooves extending in the axial direction) A valve body opening/closing device characterized by having consecutive holes.