KR100577632B1 - Method for restricting a rotatable angle in rotary valves and an actuator embodying the method - Google Patents

Abstract

It is an object of the present invention to provide a rotation angle limiting method (or mechanism) of a rotary valve which can easily change the upper limit or the lower limit of the opening angle of the valve body of the rotary valve. Another object of the present invention is to provide an actuator capable of implementing such a rotation angle limiting method.

In an actuator having a rotating shaft having a coupling portion fitted to a valve shaft of a rotary valve at a lower end, and a rotating mechanism for rotating the rotating shaft, a cam is attached to the lower end of the rotating shaft from an opening in the lower surface of the actuator. It is possible to install, and the actuator is provided with a stopper bolt that collides with a specific portion around the cam to stop the rotation of the cam.

Rotary valve, valve body, rotation angle limiting mechanism, actuator, valve shaft, rotating shaft, cam, stopper bolt

Description

Method for restricting a rotatable angle in rotary valves and an actuator embodying the method}

1 is a cross-sectional view of a conventional manual actuator.

2 is an explanatory diagram showing a rotation angle limiting mechanism of a conventional manual actuator.

3 is a cross-sectional view of a conventional electric actuator.

Figure 4 is a model bottom view of the actuator according to the present invention.

5 is a cross-sectional view taken along the line A-A of the actuator shown in FIG.

6 is a bottom view of another actuator according to the present invention.

FIG. 7 is a bottom view when the rotation shaft of the actuator shown in FIG. 6 is further rotated. FIG.

FIG. 8 is a bottom view when the cam is changed in the actuator shown in FIG. 6. FIG.

9 is a plan view of a cam that can be used in the present invention.

FIG. 10 is a sectional view taken along the line B-B when the cam shown in FIG. 9 is attached to the pivot shaft. FIG.

11 is a bottom view of the actuator according to the present invention using the cam shown in FIG.

12 is a bottom view of the actuator according to the present invention using the cam shown in FIG.

※ Explanation of code about main part of drawing ※

1: Actuator 2: Coupling Part

3: rotating shaft 4: electric motor

5: reducer 6: shaft

7: Worm 8: Worm Wheel

9: opening 10: cam

11, 12: stopper bolt 13: packing material

101, 102, 103, 104, 106: planes around the cam 10

105: hole of the cam 10

The present invention relates to a rotation angle limiting method (or mechanism) of a rotary valve. The invention also relates to an actuator capable of carrying out the method.

Generally, rotary valves, such as ball valves and butterfly valves, are designed so that the valve body can be opened and closed only within a range from the fully closed position to a fully open position of about 90 degrees. For this reason, the rotation angle limiting mechanism of a rotation valve is attached to a rotation valve. This rotation angle limiting mechanism prevents the valve body from moving in the direction of closing beyond the fully closed position and also prevents the valve body from opening beyond 90 degrees.

However, in some cases, the rotary valve may need not open the valve body to the fully open position, for example, to open only an angle of 70 degrees from the fully closed position and not open more than that. Therefore, the opening degree limiting mechanism of the valve body needs to be able to change the upper limit and the lower limit of the opening angle of the valve body in some cases.

An actuator is attached to the valve shaft to rotate the valve body. Actuators include a variety of mechanisms. For example, there are mechanisms such as a lever type, a gear type, a cylinder type, and an electric type. Whatever mechanism is used, the actuator until now has contained the rotation angle limiting mechanism of the valve body in it, but the rotation angle limiting mechanism has been integrated in the actuator, and has become integral with the actuator.

For example, in the manual actuator, as shown in FIG. 1, the rotating shaft B which has the coupling part A which receives the front-end | tip of the valve shaft of a rotary valve, and engages with a valve shaft, and the rotating shaft ( A rotating mechanism for rotating B) is provided. In FIG. 1, the rotation mechanism includes a worm wheel C fixed to the rotation shaft B, a worm D engaged with the worm wheel C, and a handle for rotating the worm D. In FIG. It consists of a handle wheel (E).

In the actuator shown in FIG. 1, the rotation angle limiting mechanism of the rotary valve is integrated with the worm wheel C. As shown in FIG. The rotation angle limiting mechanism is composed of a worm wheel C and a stopper bolt G passing through the casing F of the actuator, and cannot be taken out from the actuator. In addition, some rotation angle limiting mechanisms have a cam fixed to the rotation shaft by bolts or the like. However, since the cam is located in the middle of the rotation shaft, it is not easy to loosen the bolt, and therefore the cam is removed from the actuator. It could not be removed.

In the actuator shown in FIG. 1, the rotation angle is limited by the mechanism as shown in FIG. In Fig. 2, when the rotating shaft B having the engaging portion A is rotated in the direction of the arrow P, since the plane C2 forming one side of the worm wheel C collides with the stopper bolt G2, the rotating shaft ( B) can no longer rotate in the direction of the arrow P. At this time, the rotating shaft B is rotatable in the arrow Q direction. Therefore, when the rotation shaft B rotates in the direction of the arrow Q, the plane C1 forming the other side of the worm wheel C collides with the stopper bolt G1, and the rotation shaft B can no longer rotate. In this case, since the plane C1 and the plane C2 extend perpendicular to each other, the rotational axis B can rotate only within an angle range of 90 degrees, and no more can rotate. In this way, the worm wheel C and the stopper bolts G1 and G2 restrict the rotation angle of the rotation shaft B. FIG.

Electric actuators are based on the same principle. The electric actuator is described, for example, in Japanese Patent No. 2977505. This actuator has a complicated structure, as shown in FIG. This is because this actuator is provided with the positioning member of a valve body, the means for detecting a rotation angle, and the 1st mounting member other than an electric motor. However, the rotation angle limiting mechanism therein is a simple one consisting of a stopper plate (H) fixed to the rotation shaft (B) and a stopper bolt (G) attached to the casing (F). That is, rotation is restricted by one surface of the stopper plate H and the other surface (not shown in the figure) colliding with the stopper bolt G, respectively. Therefore, the angle limiting mechanism in this case has a structure as shown in Figs. 1 and 2.

Thus, the rotation angle limiting mechanism of the rotary valve in the conventional actuator is integrally assembled in the inside of the actuator, and it is difficult to access this from the outside. Therefore, this rotation angle limiting mechanism could not remove this.

The present invention is to realize that it is necessary to change the upper limit and the lower limit of the opening angle of the valve body in the rotary valve as described above, to provide a mechanism capable of changing the upper limit or the lower limit of the opening angle of the valve body as needed. will be. In addition, it is therefore an object of the present invention to provide an improved actuator so that the upper limit or the lower limit of the opening angle can be easily changed.

MEANS TO SOLVE THE PROBLEM The present inventor detach | attaches the cam which rotates newly with a rotation shaft newly in the lower end of the rotation shaft in an actuator, and attaches the cam detachably to the stopper bolt attached to the actuator to limit rotation. The inventors have found that the cam can be solved by detaching the cam from the lower surface side of the actuator.

The present invention relates to an actuator having a coupling shaft fitted to an upper end of a valve shaft of a rotary valve and having a rotatable rotating shaft and a rotating mechanism for rotating the rotating shaft, the opening shaft being provided from an opening provided on a lower surface of the actuator. The cam is detachably attached to the lower end, and the attached cam is rotated together with the rotational shaft. The actuator is provided with a stopper bolt that collides with a specific part of the cam and suppresses the rotation of the cam. It is an object of the present invention to provide a rotation angle limiting method of a rotary valve, wherein an upper limit and / or a lower limit of a rotation angle of a rotation shaft can be changed.

The present invention also provides an improved actuator which makes it possible to change the upper and / or lower limits of the rotational angle of the rotary valve. The improved actuator is an actuator having a rotating shaft which is rotatable by having the engaging portion of the rotary valve to the upper end of the valve shaft at a lower end thereof, and a rotating mechanism for rotating the rotating shaft. The cam is detachably attached to the lower end of the cam, and the cam is rotated together with the pivot shaft. The actuator is provided with a stopper bolt that collides with a specific part of the cam to suppress rotation of the cam. It is characterized in that the upper limit and / or the lower limit of the rotation angle of the rotation shaft can be changed.

An embodiment of the present invention will be described below with reference to the drawings. 4 is a schematic bottom view of an actuator according to the present invention. 5 is a cross-sectional view taken along the line A-A of the actuator shown in FIG. 6 is a bottom view of another actuator according to the invention. 7 is a bottom view showing a state when the rotation shaft of the actuator shown in FIG. 6 is further rotated. FIG. 8 is a bottom view showing a state when a separate cam is attached to the rotation shaft of the actuator shown in FIG. 6. 9 is a plan view of a cam that can be used in the present invention. FIG. 10 is a B-B tip shaving when the cam shown in FIG. 9 is attached to the pivot shaft. FIG. FIG. 11 is a bottom view of the actuator when the upper limit of the rotation angle is 90 degrees using the cam shown in FIG. 9. FIG. FIG. 12 is a bottom view of the actuator when the cam shown in FIG. 9 is placed oppositely and in the opposite direction, and the upper limit of the rotation angle is 70 degrees. FIG.

In Fig. 4 and Fig. 5, reference numeral 1 denotes an electric gear reduction actuator according to the present invention. The actuator 1 has the rotating shaft 3 which became rotatable by having the coupling part 2 to the valve shaft upper end of a rotary valve at one end, and the rotating mechanism for rotating the rotating shaft 3. The rotating mechanism consists of the electric motor 4, the reduction gear 5 which consists of a flat tire difference, the worm 7 attached to the shaft 6, and the worm wheel 8.

The actuator 1 necessarily includes an opening 9 for connecting the valve shaft of the rotary valve to the rotation shaft 3 on the lower surface thereof. Therefore, the actuator 1 can be attached to the lower end of the rotation shaft 3 so that the cam 10 can be detachably attached from the opening 9. The cam 10 is provided with the hole for penetrating the rotation shaft 3 inside, and when it is attached to the rotation shaft 3, it will be able to rotate with the rotation shaft 3. In the actuator 1, two stopper bolts 11 and 12 are attached to the outer shell. The stopper bolts 11 and 12 can both advance and retract by nuts fixed to the outer shell, and collide with specific portions of the circumference of the cam 10, respectively, to suppress the rotation of the cam 10. It is the rotation angle limiting mechanism which concerns on this invention that the upper limit and / or the lower limit of the rotation angle of a rotation shaft can be changed by attaching and detaching the cam 10 to the rotation shaft 3.

In the actuator shown to FIG. 4 and FIG. 5, the upper limit and the lower limit of the rotation angle of the rotating shaft 3 are regulated as follows. That is, when the cam 10 comes to the position as shown in FIG. 4, since the one plane 101 around the cam 10 collides with the stopper bolt 11, the cam 10 is no longer an arrow. It cannot rotate in the P direction. Therefore, rotation of the rotating shaft 3 in the arrow P direction is restricted in this state, and the lower limit of the rotation angle of the rotating shaft 3 is determined.

When the cam 10 is in the position as shown in FIG. 4, the cam 10 can rotate in the arrow Q direction. When the cam 10 rotates in the direction of the arrow Q, since no part protrudes from one plane 101 to the other plane 102, until the other plane 102 impinges on the stopper bolt 12, The cam 10 can rotate. In this way, rotation of the cam 10 is stopped because another plane 102 collides with the stopper bolt 12. Therefore, as for the rotating shaft 3, the other plane 102 collides with the stopper bolt 12, and rotation is regulated and the upper limit of the rotation angle is determined.

In the cam 10 shown in FIG. 4, since one plane 101 and the other plane 102 extend in the perpendicular direction to each other, the pivot shaft 3 in FIG. 4 can rotate only within an angle range of 90 degrees. It becomes possible. On the other hand, when the cam 10 is extended to the place where the other plane 102 is the plane 106 shown by a dashed line, the cam can rotate until the plane 106 impinges on the bolt 12. The upper limit of the rotation angle becomes a small value. Therefore, the actuator can change the upper limit and the lower limit of the rotation angle by replacing the cam 10. Since the cam 10 is detachable from the opening 9 provided in the lower surface of the actuator, the cam is easily replaced, and therefore, the upper and lower limits of the rotation angle can be easily changed.

Figure 6 shows the bottom of another electric actuator according to the invention. In the actuator of FIG. 6, the cam 10 can be detachably attached to the lower end of the rotation shaft 3 from the opening 9 provided in the lower surface, and the cam 10 installed is attached to the rotation shaft 3. It is supposed to be able to rotate together. In the cam 10, the stopper bolt 11 collides with the plane 101 on one side thereof, and rotation of the arrow Q direction is suppressed, and the stopper bolt 12 collides with the plane 102 on the other side, and the arrow 10 Rotation in the P direction is suppressed. This point is the same as the actuator shown in FIGS. 4 and 5.

In the actuator shown in FIG. 6, since the plane 101 and the plane 102 extend in directions perpendicular to each other, the angle range in which the rotation shaft 3 can rotate is also 90 degrees. However, even in the actuator shown in FIG. 6, as shown in FIG. 7, when the stopper bolt 11 is rotated and the tip thereof protrudes largely into the actuator, the flat surface 102 around the cam 10 stops the stopper bolt. Only by rotating in the direction of arrow Q slightly from the position which collided with (12), since the plane 101 collides with the stopper bolt 11, a rotation angle can be made small temporarily.

However, in the state shown in FIG. 7, since only a part of the tip of the stopper bolt 11 collides with the plane 101, the cam 10 is only suppressed in rotation, and therefore, only a part of the tip is immediately used. Abrasion and therefore cannot always stop rotation at a certain angle. Therefore, the cam 10 or the bolt 11 also needs to be replaced. In the conventional actuators in which a cam is provided in the middle of the rotation shaft, these replacements are not easy, but in the actuator of the present invention in which the cam is attached to the lower end of the rotation shaft, the replacement is easy.

In the actuator shown in FIG. 6, if the upper limit of the rotation angle of the rotational shaft 3 is set to 70 degrees, for example, the cam 10 as shown in FIG. 8 must be used. In the cam 10 shown in FIG. 8, the plane 101 and the plane 102 form an angle α of 70 degrees. In the actuator shown in FIG. 6, the upper limit of the rotation angle can be easily changed from 90 degrees to 70 degrees by replacing the cam 10 with the cam 10 shown in FIG. 8.

FIG. 9 shows an example in which the upper limit of the rotation angle of the rotational shaft can be set to 90 degrees or 70 degrees by using one same cam 10. The cam 10 shown in FIG. 9 extends in a direction in which the plane 101 and the plane 102 positioned around the cam 10 form an angle of 90 degrees, and also the plane 103 and the plane 104. ) Extend in a direction to form an angle of 70 degrees to each other.

When the cam 10 shown in FIG. 9 is extended so that the plane 101 extends horizontally and the plane 102 extends vertically, that is, it is attached to the rotation shaft 3 as shown in FIG. 11, the obtained actuator will rotate. The upper limit of the angle is 90 degrees. On the other hand, with the same cam 10 reversed, the plane 104 extends in the horizontal direction at the bottom, and the plane 103 is positioned to come to the right side and descend from the right side to the left side, as shown in FIG. Similarly, when attached to the rotating shaft 3, the obtained actuator will be made into the upper limit of the rotation angle of 70 degree | times. Therefore, by changing the laying direction using one cam, the upper limit of the rotation angle can be set to 90 degrees or 70 degrees.

In addition, the cam 10 of FIG. 9 is improved so that it may be easily attached to a rotating shaft. Originally, since the cam 10 should be placed on the lower end of the rotation shaft 3 from the lower side of the actuator, it is easy to fall from the rotation shaft 3 at the time of installation. Therefore, it is necessary to temporarily stop and stop the rotation shaft 3 temporarily so that the cam does not fall from the rotation shaft 3 when the cam is placed. Therefore, the cam 10 of FIG. 9 is equipped with the hole 105 for penetrating the rotation shaft 3, and the hole 105 is processed more.

Since the cam 10 shown in FIG. 9 penetrates and engages the rotational shaft 3, the cam 10 is provided with the square hole 105 which does not have the edge matching the cross-sectional shape of the rotational shaft 3. The wall surface of the hole 105 has a groove extending therein in a round annular shape, as shown by a dotted line in FIG. 9 therein. Since the wall surface is non-circular, such as a square without a corner, and the groove extends in a round ring shape, the groove is deeply perforated in the portion M, and shallowly perforated in the portion N. However, the groove width is the same throughout. This groove is for inserting an annular packing material.

When an elastic annular packing member is inserted into the groove, the packing member sinks to the inner bottom of the groove in the deep portion M, but protrudes from the groove in the shallow portion N. In this way, when the lower end of the rotation shaft 3 faces the hole 105 in which the packing material is laid, and the cam 10 is forcibly pressed along the rotation shaft 3, only the packing material which protrudes from the part N is press-fitted. Since only the resistance to, the laying of the cam 10 is easy.

In this way, when the cam 10 is attached to the rotating shaft 3, the packing material which protruded from the groove in the part N will fill up between the cam 10 and the rotating shaft 3. As shown in FIG. For this reason, the cam 10 is stopped by the rotation shaft 3 by the surface friction between the protruding packing material and the rotation shaft. Accordingly, the cam 10 is temporarily stopped by the actuator until the valve shaft of the rotary valve is attached to the lower end of the rotational shaft 3, thereby facilitating the connection of the actuator to the rotary valve.

FIG. 10 is a cross-sectional view taken along the line B-B in FIG. 9 when the packing material is inserted into the groove of the cam 10 shown in FIG. 9 and the cam 10 is attached to the pivot shaft 3. In FIG. 10, since the packing material 13 is inserted in the deep part M with a groove, it is located in the groove.

When the actuator is removed from the rotary valve for the replacement of the cam 10, the packing material 13 fills between the cam 10 and the rotational shaft in the portion N as described above. 10 does not immediately fall from the actuator. However, if the cam 10 is pulled out strongly by applying a force above the surface friction described above, the cam 10 can be removed from the actuator. In this way, the cam 10 can be replaced easily.

According to the present invention, since the cam is detachably attached to the lower end of the rotating shaft from the opening provided in the lower surface of the actuator, and the attached cam is rotated together with the rotating shaft, the cam rotating together with the rotating shaft can be easily mounted. It can be attached to or removed from the rotating shaft. Moreover, since the stopper bolt which collides with the specific part of the circumference | surroundings of a cam is provided in the actuator, rotation of a cam can be suppressed by a stopper bolt. Thus, by attaching and detaching the cam, in particular by replacing the cam, not only in the range of 0 to 70 degrees or 0 to 90 degrees shown in the example, but also to the upper and / or lower limits of the rotational angle of the rotational shaft of, for example, 0 to 50 degrees It can be easily changed arbitrarily.

Further, according to the present invention, the upper limit and / or the lower limit of the rotation angle of the rotation shaft can be easily changed even by adjusting the length of the stopper bolt protruding, in which case the upper limit and / or the rotation angle is caused by the wear of the cam. When the lower limit cannot be obtained reliably, the cam can be returned to a certain rotational angle by replacing the cam. Moreover, since the rotation angle limiting mechanism of the rotational shaft can be provided by any of lever, gear, cylinder, and electric type, it can be widely used.

In particular, when a hole for penetrating the rotating shaft is provided inside the cam and the cross-sectional shape of the rotating shaft portion in contact with the cam is made non-circular, only the rotating shaft is inserted into the hole of the cam, and the rotating shaft The cam can be laid so as to rotate, and can be easily pulled out on the contrary.

Furthermore, in the packing material protruding from the groove, a round annular groove is formed on the wall surface of the rotation shaft insertion hole provided in the cam, and the circular annular packing material is inserted into the groove. If at least a part of the camshaft is in contact with the protrusion of the pivot shaft, the cam can be prevented from falling from the pivot shaft due to contact friction between the pivot shaft and the packing material. It is also easy to remove from the cam, thus facilitating exchange of the cam.

Furthermore, at least one set of spaced apart planar portions is formed around the cam, and an angle restricting an upper limit or a lower limit of the rotation angle of the rotary valve is formed at the planar portions so as not to protrude from the planar portions between the planar portions. If the surface is formed, the cam can be attached to the lower end of the rotational shaft, whereby the actuator can be easily rotated within the desired rotation angle range.

In particular, if two sets of planar portions defining the first upper limit value and the second upper limit value of the rotation angle of the rotary valve are formed around one cam, the two cams are easily changed by simply changing the installation direction of the one cam. It is possible to obtain an actuator that rotates within the range of the rotation angle of the branch. The present invention brings these benefits.

Claims (6)

In an actuator provided with a rotatable rotating shaft 3 having a coupling portion 2 fitted at an upper end of a valve shaft of a rotary valve and a rotating mechanism for rotating the rotating shaft, an opening provided on the lower surface of the actuator A set of planar portions 101 for freely attaching and detaching the cam 10 from the spherical shaft to the lower end of the rotating shaft and regulating the first upper limit value and the first lower limit value of the rotation angle of the rotary valve around the one cam 10. 102, and another set of planar portions 103, 104 for regulating the second upper limit value and the second lower limit value of the rotation angle, and the actuator collides with one or another set of planar portions of the cam to prevent rotation of the cam. A method for limiting the rotation angle of a rotary valve, characterized by providing a stopper bolt (11, 12) to be suppressed and reversing the cam by reversing the cam to change the upper or lower limit of the rotation angle of the rotation shaft. The cross section of a portion in contact with the cam of the rotation shaft 3 is formed in a square without corners according to claim 1, wherein a hole 105 for penetrating the rotation shaft 3 is provided inside the cam 10. And inserting the rotating shaft (3) into the hole (105) of the cam to enable the cam to rotate with the rotating shaft and to be detached freely. 3. The wall surface of the hole 105 of the cam 10 is formed with a round annular groove extending in the circumferential direction of the hole, and the round annular packing material 13 is inserted into the groove. At least a portion of the packing material 13 protruding from the contacting surface of the rotating shaft and preventing the cam from falling from the rotating shaft by the contact friction between the rotating shaft and the packing member. Angle limiting method. 4. A surface according to any one of the preceding claims, wherein a surface which does not protrude from each plane portion anywhere between the one set of planar portions (101, 102) and the other set of planar portions (103, 104). Method for limiting the rotation angle of the rotary valve, characterized in that. delete In an actuator having a rotating shaft (3) having a coupling portion (2) fitted to an upper end of a valve shaft of a rotary valve and a rotatable rotating shaft (3) and a rotating mechanism for rotating the rotating shaft, A set of flat portions 101 which allow the cam to be attached to and detached from a lower end of the rotation shaft from an opening provided in the lower surface of the actuator, and regulate the first upper limit value and the first lower limit value of the rotation angle of the rotary valve around one cam. 102, and another set of planar portions 103, 104 for regulating the second upper limit value and the second lower limit value of the rotation angle, and the actuator collides with one or another set of planar portions of the cam to prevent rotation of the cam. The upper and lower limits of the rotational angle of the rotating shaft can be changed by placing stopper bolts 11 and 12 to be suppressed and removing one cam 10 to reverse the cam to change the direction. Actuator.

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