JP2003329168A - Rotational angle limiting mechanism of rotary valve and actuator having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotational angle limiting mechanism of a rotary valve for easily changing the upper limit or the lower limit of the opening angle of a valve element of the rotary valve as necessary, and an actuator having the rotational angle limiting mechanism. <P>SOLUTION: In the actuator having a rotary shaft having a fitting part to a valve shaft of the rotary valve at a lower end thereof and a rotating mechanism to rotate the rotary shaft, a cam is attachably/detachably fitted to a lower end of the rotary shaft from an open port formed in a lower surface of the actuator, and a stopper bolt which collides with a specified part on a circumferential edge of the cam to restrict the rotation of the cam is added to the actuator. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation angle limiting mechanism for rotary valves. The present invention also relates to an actuator including the above mechanism.

[0002]

2. Description of the Related Art Generally, a rotary valve such as a ball valve or a butterfly valve can be opened and closed only within a range from a fully closed position to a fully open position of about 90 degrees. For this purpose, the rotary valve is provided with a rotation angle limiting mechanism for the rotary valve. This rotation angle limiting mechanism prevents the valve body from moving in the closing direction beyond the fully closed position, and prevents the valve body from opening beyond 90 degrees.

However, in some cases, the rotary valve is required not to open the valve body to the fully open position, for example, to open it by an angle of 70 degrees from the fully closed position and prevent it from opening further. Sometimes. Therefore, it is necessary that the opening degree restriction mechanism of the valve body can change the upper limit and the lower limit of the opening angle of the valve body depending on the case.

An actuator is attached to the valve shaft of the rotary valve in order to rotate the valve body. There are various types of actuators. For example, there are lever-type, gear-type, cylinder-type, and electric-type mechanisms. No matter which mechanism is used, the actuator so far includes the rotation angle limiting mechanism of the valve body therein, but the rotation angle limiting mechanism is incorporated inside the actuator and It has been considered inseparable.

For example, in a manual actuator, as shown in FIG. 1, a rotary shaft B having a fitting portion A for accommodating the tip of the valve shaft of the rotary valve and fitting with the valve shaft is provided. , And a rotating mechanism for rotating the rotating shaft B. In FIG. 1, the rotating mechanism includes a worm wheel C fixed to a rotating shaft B, a worm D that meshes with the worm wheel C, and a handle wheel E for rotating the worm D.

In the actuator shown in FIG. 1, the rotation angle limiting mechanism of the rotary valve is integrated with the worm wheel C. The rotation angle limiting mechanism is a worm wheel C.
And a stopper bolt G that penetrates the casing F of the actuator and cannot be taken out separately from the actuator. In addition, there was also a rotation angle limiting mechanism in which a cam was fastened to the rotating shaft by tightening it with bolts, but since the cam is located in the middle of the rotating shaft, it is easy to loosen the bolt. And therefore the cam could not be removed from the actuator.

In the actuator shown in FIG. 1,
The rotation angle is limited by the mechanism shown in FIG. In FIG. 2, when the rotating shaft B having the fitting portion A is rotated in the direction of the arrow P, the plane C2 forming one side of the worm wheel C collides with the stopper bolt G2, so that the rotating shaft B is As a result, it cannot rotate in the direction of arrow P. At this time, the rotation axis B can be rotated in the direction of arrow Q, on the contrary. Therefore, when the rotation axis B rotates in the direction of arrow Q,
The plane C1 forming the other side of the worm wheel C collides with the stopper bolt G1 and the rotating shaft B cannot rotate any more. In this case, since the plane C1 and the plane C2 extend perpendicularly to each other, the rotation axis B can rotate only within the angular range of 90 degrees and cannot rotate any further. Thus, the worm wheel C and the stopper bolt G1,
G2 limits the rotation angle of the rotation axis B.

The same principle is applied to the case of an electric actuator. The electric actuator is described in, for example, Japanese Patent No. 2977505. This actuator has a complicated structure as shown in FIG. This is because this actuator includes a positioning member for the valve body, a means for detecting a rotation angle, and a first mounting member in addition to the electric motor. But,
The rotation angle limiting mechanism therein is a simple one composed of a stopper plate H fixed to the rotating shaft B and a stopper bolt G attached to the casing F. That is, the rotation of the stopper plate H is restricted by the collision of one surface and the other surface (neither of which is shown) with the stopper bolt G. Therefore, the angle limiting mechanism in this case has a structure similar to that shown in FIGS.

As described above, the rotation angle limiting mechanism of the rotary valve in the conventional actuator is integrally incorporated inside the actuator, and it is difficult to approach it from the outside. Therefore, this rotation angle limiting mechanism
I couldn't remove it.

[0010]

SUMMARY OF THE INVENTION The present invention realizes that it is necessary to change the upper limit and the lower limit of the opening angle of the valve element in the rotary valve as described above. It is intended to provide a mechanism that can change the lower limit as needed. Further, therefore, the present invention aims to provide an improved actuator so that the upper limit or the lower limit of the opening angle can be easily changed.

[0011]

SUMMARY OF THE INVENTION The inventor has found that the above-mentioned problem is that a new cam that rotates together with the rotating shaft is detachably attached to the lower end of the rotating shaft of the actuator, and the peripheral edge of the cam is attached to the actuator. It has been found that the problem can be solved by colliding with the stopper bolt to limit the rotation and by making the cam detachable from the lower surface side of the actuator.

According to the present invention, there is provided an actuator including a rotating shaft having one end having a fitting portion for fitting the upper end of a valve shaft of a rotary valve and being rotatable, and a rotating mechanism for rotating the rotating shaft. , A cam is detachably attached to the lower end of the rotating shaft from the opening provided on the lower surface of the actuator, and the attached cam is rotated together with the rotating shaft, and the actuator collides with a specific part of the peripheral edge of the cam. And a stopper bolt for suppressing the rotation of the cam are attached, and the upper and / or lower limit of the rotation angle of the rotating shaft can be changed by attaching and detaching the cam. To do.

The present invention also provides an improved actuator in which the upper limit and / or the lower limit of the rotation angle of the rotary valve can be changed. The improved actuator is an actuator equipped with a rotating shaft having a fitting portion for fitting the upper end of the valve shaft of the rotary valve on the lower end and being rotatable, and a rotating mechanism for rotating the rotating shaft. Then, a cam is detachably attached to the lower end of the rotating shaft from the opening provided on the lower surface of the actuator, and the attached cam is rotated together with the rotating shaft. It is characterized in that a stopper bolt is attached to prevent the cam from colliding with the rotation of the cam, and the upper and / or lower limit of the rotation angle of the rotating shaft can be changed by attaching or detaching the cam.

An example of the present invention will be described with reference to the drawings as follows. FIG. 4 is a schematic bottom view of the actuator according to the present invention. FIG. 5 is a cross-sectional view taken along the line AA of the actuator shown in FIG. FIG. 6 is a bottom view of another actuator according to the present invention. FIG. 7 is a bottom view showing a state when the rotary shaft of the actuator shown in FIG. 6 is further rotated. Figure 8
FIG. 7 is a bottom view showing a state in which another cam is attached to the rotary shaft of the actuator shown in FIG. 6. FIG. 9 is a plan view of a cam that can be used in the present invention. Figure 1
0 indicates B- when the cam shown in FIG. 9 is attached to the rotary shaft.
It is a B line sectional view. FIG. 11 is a bottom view of the actuator when the upper limit of the rotation angle is set to 90 degrees using the cam shown in FIG. FIG. 12 is a bottom view of the actuator when the cam shown in FIG. 9 is turned over and attached in a different direction to set the upper limit of the rotation angle to 70 degrees.

In FIGS. 4 and 5, reference numeral 1 is an electric gear reduction actuator according to the present invention. The actuator 1 has a rotating shaft 3 which has a fitting portion 2 for fitting the upper end of the valve shaft of the rotating valve at one end and is rotatable, and a rotating mechanism for rotating the rotating shaft 3. The rotating mechanism includes an electric motor 4, a speed reducer 5 including a combination of spur gears, a worm 7 attached to a shaft 6, and a worm wheel 8.

The actuator 1 always has an opening 9 on its lower surface for connecting the valve shaft of the rotary valve to the rotary shaft 3. Therefore, the actuator 1 is opened from the opening 9 to the cam 10.
Is detachably attached to the lower end of the rotary shaft 3. The cam 10 has a hole for penetrating the rotating shaft 3 therein, and when attached to the rotating shaft 3, the cam 10 can rotate together with the rotating shaft 3. The actuator 1 is provided with two stopper bolts 11 and 12 on the outer shell. Each of the stopper bolts 11 and 12 can be moved forward and backward by a nut fixed to the outer shell.
It is supposed that the rotation of the cam 10 can be suppressed by colliding with a specific portion of the periphery of 0. It is the rotation angle limiting mechanism according to the present invention that the upper limit and / or the lower limit of the rotation angle of the rotation shaft can be changed by attaching / detaching the cam 10 to / from the rotation shaft 3.

In the actuator shown in FIGS. 4 and 5, the upper and lower limits of the rotation angle of the rotary shaft 3 are regulated as follows. That is, when the cam 10 comes to the position shown in FIG. 4, the one surface 101 of the peripheral edge of the cam 10 collides with the stopper bolt 11, so that the cam 10 cannot rotate in the arrow P direction any more. Therefore, in this state, the rotation shaft 3 is restricted from rotating in the arrow P direction, and the lower limit value of the rotation angle of the rotation shaft 3 is set.

When the cam 10 is in the position shown in FIG. 4, the cam 10 can rotate in the direction of arrow Q. Cam 1
When 0 rotates in the direction of arrow Q, one surface 101 moves to the other surface 10
Since there is no protruding portion up to 2, the other surface 102
The cam 10 can rotate until it hits the stopper bolt 12. Thus, the cam 10 has the other surface 102
Collides with the stopper bolt 12 and its rotation is stopped.
Therefore, the other surface 102 of the rotating shaft 3 is the stopper bolt 12
And the rotation is restricted, and the upper limit of the rotation angle is set.

Since the one surface 101 and the other surface 102 of the cam 10 shown in FIG. 4 extend perpendicularly to each other, the rotating shaft 3 in FIG. 4 can rotate only within an angle range of 90 degrees. On the other hand, when the cam 10 has the other surface 102 expanded to the plane 106 shown by the alternate long and short dash line, the cam can rotate until the plane 106 collides with the bolt 12, and the upper limit of the rotation angle is small. Become. Therefore, the actuator can change the upper and lower limits of the rotation angle by replacing the cam 10. The cam 10 is an opening 9 provided on the lower surface of the actuator.
Since it is detachable from the cam, it is easy to replace the cam, and therefore it is easy to change the upper limit and the lower limit of the rotation angle.

FIG. 6 shows the bottom surface of another electric actuator according to the present invention. In the actuator of FIG. 6, a cam 10 can be removably attached to the lower end of the rotating shaft 3 through an opening 9 provided on the lower surface, and the attached cam 10
Is capable of rotating together with the rotating shaft 3. In the cam 10, the stopper bolt 11 collides with the flat surface 101 on one side of the cam 10 to prevent the cam 10 from rotating in the direction of the arrow Q, and the stopper bolt 12 collides with the flat surface 102 of the other side with the arrow P.
Directional rotation is suppressed. These points are shown in FIG. 4 and FIG.
It is similar to the actuator shown in.

In the actuator shown in FIG. 6, the plane 1
01 and the plane 102 extend in a direction forming a right angle with each other, the angular range in which the rotary shaft 3 can rotate is 9
It is 0 degrees. However, in the actuator shown in FIG. 6 as well, when the stopper bolt 11 is rotated to project the tip of the stopper bolt largely into the actuator as shown in FIG. 7, the flat surface 102 at the peripheral edge of the cam 10 becomes the stopper bolt 12. Since the plane 101 collides with the stopper bolt 11 only by slightly rotating in the direction of the arrow Q from the collision position, the rotation angle can be temporarily reduced.

However, in the state shown in FIG. 7, the cam 10 is merely prevented from rotating by the collision of a small part of the tip of the stopper bolt 11 with the flat surface 101. Wears off quickly, so it cannot always stop turning at a certain angle. Therefore, it is necessary to replace the arrow cam 10 or the bolt 11. However, these replacements are not easy.

In the actuator shown in FIG. 6, if the upper limit of the rotation angle of the rotary shaft 3 is to be 70 degrees, for example, the cam 10 shown in FIG. 8 must be used. The cam 10 shown in FIG.
And 2 form an angle α of 70 degrees. The actuator shown in FIG. 6 can easily change the upper limit of the rotation angle from 90 degrees to 70 degrees by replacing the cam 10 with the cam 10 shown in FIG.

FIG. 9 shows an example in which the upper limit of the rotation angle of the rotary shaft can be set to 90 degrees or 70 degrees using one and the same cam 10. The cam 10 shown in FIG.
Is a plane 101 and a plane 102 located on the periphery of the cam 10.
Extend in a direction forming an angle of 90 degrees, and the planes 103 and 104 extend in a direction forming an angle of 70 degrees with each other.

When the cam 10 shown in FIG. 9 is attached to the rotary shaft 3 such that the plane 101 extends horizontally and the plane 102 extends vertically, that is, as shown in FIG. 11, the obtained actuator is rotated. The upper limit of the angle is 90 degrees. On the other hand, with the same cam 10 turned inside out, the plane 104 is located downward and extends in the horizontal direction, and the plane 103 is positioned so as to come to the right side and descend from the right to the left.
When attached to the rotary shaft 3 as shown in FIG. 5, the obtained actuator has a rotation angle of 70 degrees as the upper limit.
Therefore, the upper limit of the rotation angle can be set to 90 degrees or 70 degrees by using one cam and changing its attaching direction.

Further, the cam 10 shown in FIG. 9 is improved so that it can be easily attached to the rotary shaft. Originally, cam 10
Should be attached to the lower end of the rotary shaft 3 from the lower side of the actuator, so that it is likely to fall from the rotary shaft 3 at the time of attachment. Therefore, it is necessary to temporarily and easily engage the rotating shaft 3 so that the cam does not drop from the rotating shaft 3 when the cam is attached. Therefore, the cam 10 of FIG. 9 includes a hole 105 for allowing the rotation shaft 3 to pass therethrough, and
05 has been devised.

The cam 10 shown in FIG. 9 is provided with a square hole 105 having a square corner matching the cross-sectional shape of the rotary shaft 3 in order to penetrate the rotary shaft 3 to be fitted therein. Hole 105
The wall surface of is provided with a groove extending in an annular shape at the inner side thereof as shown by a dotted line in FIG. Since the wall surface has a non-circular shape such as a square with square corners, and the groove extends in an annular shape, the groove is deeply formed in the portion M and is shallowly formed in the portion N. However, the groove width is made uniform throughout. This groove is for inserting an annular packing material.

When a ring-shaped packing material having elasticity is inserted into the groove, the packing material is sunk in the deep part of the groove at the deep part M of the groove, but it oozes out from the groove at the shallow part N of the groove. ing. In this way, the hole 105 provided with the packing material
When the lower end of the rotating shaft 3 is exposed to the inside and the cam 10 is forcibly pushed along the rotating shaft 3, the packing material protruding from the portion N only resists the pushing. Installation is easy.

When the cam 10 is attached to the rotary shaft 3 in this way, the packing material protruding from the groove in the portion N fills the space between the cam 10 and the rotary shaft 3. Therefore, the cam 10 is locked to the rotating shaft 3 by the surface friction between the protruding packing material and the rotating shaft. Therefore, the cam 10 is temporarily locked to the actuator until the valve shaft of the rotary valve is attached to the lower end of the rotary shaft 3, and it becomes easy to connect the actuator to the rotary valve. .

FIG. 10 is a sectional view taken along line BB 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 rotary shaft 3. Figure 10
Since the packing material 13 is inserted in the deep portion M of the groove, the packing material 13 is located deep in the groove.

When the actuator is removed from the rotary valve for replacement of the cam 10, the packing material 13 fills the space between the cam 10 and the rotating shaft in the portion N as described above, so that the surface friction of the packing material. As a result, the cam 10 does not immediately drop from the actuator. However, the cam 10 can be detached from the actuator by pulling the cam 10 strongly by applying a force more than the above-mentioned surface friction. In this way, the cam 10 can be easily replaced.

[0032]

According to the present invention, the cam is detachably attached to the lower end of the rotary shaft from the opening provided on the lower surface of the actuator, and the attached cam is rotated together with the rotary shaft. The cam that rotates together with the rotating shaft can be easily attached to or removed from the rotating shaft. Further, since the actuator is provided with a stopper bolt that collides with a specific portion of the peripheral edge of the cam, the rotation of the cam can be suppressed by the stopper bolt. Therefore, by attaching / detaching the cam, especially by replacing the cam, not only the range of 0 to 70 degrees or 0 to 90 degrees shown in the example, but also the upper limit of the rotation angle of the rotating shaft such as 0 to 50 degrees and / or The lower limit 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 rotary shaft can be easily changed by adjusting the protruding length of the stopper bolt. In this case, the rotation angle of the rotation angle can be reduced by the abrasion of the cam. When the upper limit and / or the lower limit cannot be reliably obtained, it is possible to return to a reliable rotation angle by replacing the cam. Further, such a rotation angle limiting mechanism of the rotating shaft can be attached to any one of a lever type, a gear type, a cylinder type, an electric type and the like, and thus can be widely used.

In particular, if a hole for penetrating the rotating shaft is provided inside the cam and the cross-sectional shape of the rotating shaft contacting the cam is non-circular, the rotating shaft is inserted into the hole of the cam. Only then, the cam can be attached so as to rotate together with the rotating shaft, and conversely, the cam can be easily removed.

Further, an annular groove extending in the circumferential direction of the hole is formed on the wall surface of the hole for inserting the rotary shaft provided in the cam, and an annular packing material is inserted into the groove, and the groove is eroded from the groove. If at least a part of the packing material that comes out contacts the protruding portion of the rotary shaft, it is possible to prevent the cam from dropping from the rotary shaft due to the contact friction between the rotary shaft and the packing material. , The cam can be easily attached to the actuator, and the cam can be easily removed from the actuator, so that the cam can be easily replaced.

Further, at least one set of separated flat surface portions are formed on the peripheral edge of the cam, and an angle for restricting the upper limit value or the lower limit value of the rotation angle of the rotary valve is formed on the flat surface portion, and between the flat surface portions. If you form a surface that does not protrude from the flat part,
By attaching the cam to the lower end of the rotary shaft, it is possible to easily obtain an actuator that rotates within a range of a desired rotation angle.

In particular, when two sets of plane portions defining the first upper limit value and the second upper limit value of the rotation angle of the rotary valve are formed on the periphery of one cam, this one cam is attached. By simply changing the direction, it is possible to easily obtain an actuator that rotates within a range of two desired rotation angles. The present invention provides such benefits.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional manual actuator.

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

FIG. 3 is a sectional view of a conventional electric actuator.

FIG. 4 is a schematic bottom view of the actuator according to the present invention.

5 is a sectional view of the actuator shown in FIG. 4 taken along the line AA.

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

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

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

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

10 is a sectional view taken along line BB when the cam shown in FIG. 9 is attached to a rotary shaft.

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

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

[Explanation of symbols]

1 Actuator according to the present invention 2 Rotating shaft fitting part 3 Rotating shaft 4 Electric motor 5 Speed reducer 6 Shaft 7 Worm 8 Worm wheel 9 Opening port 10 Cam 11, 12 Stopper bolt 13 Packing material 101, 102, 103, 104 , 106 Plane 105 around the edge of the cam 10 Hole in the cam 10

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 13, 2002 (2002.5.1)
3)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

However, in the state shown in FIG. 7, the cam 10 is merely prevented from rotating by the collision of a small part of the tip of the stopper bolt 11 with the flat surface 101. Wears off quickly, so it cannot always stop turning at a certain angle. Therefore, it is necessary to replace the arrow cam 10 or the bolt 11. A conventional actuator with a cam attached in the middle of the rotation axis
In the mediator, but these replacement is was not easy, times
The actuator of the present invention in which a cam is attached to the lower end of the moving shaft.
Is easy to replace .

Claims (6)

[Claims] 1. An actuator comprising a rotating shaft having one end having a fitting portion for fitting to an upper end of a valve shaft of a rotating valve and being rotatable, and a rotating mechanism for rotating the rotating shaft,
A cam is detachably attached to the lower end of the rotating shaft from the opening provided on the lower surface of the actuator, and the attached cam is rotated together with the rotating shaft.The actuator collides with a specific portion of the peripheral edge of the cam. A rotation angle limiting mechanism for a rotary valve, wherein a stopper bolt for suppressing rotation of the cam is attached, and the upper and / or lower limit of the rotation angle of the rotary shaft can be changed by attaching or detaching the cam. 2. A hole for penetrating a rotation shaft is provided inside the cam, and a cross-sectional shape of the rotation shaft of a portion contacting with the cam is formed into a square notch, and the rotation shaft is provided in the hole of the cam. The rotation angle limiting mechanism for a rotary valve according to claim 1, wherein the cam is detachably attached so as to be rotatable together with the rotary shaft by being inserted. 3. An annular groove extending in the circumferential direction of the hole is formed on the wall surface of the hole of the cam, and an annular packing material is inserted into the groove, and at least one of the packing materials protruding from the groove is formed. 3. The rotation according to claim 2, wherein the portion is brought into contact with the protrusion of the rotating shaft to prevent the cam from dropping from the rotating shaft due to contact friction between the rotating shaft and the packing material. Valve rotation angle limiting mechanism. 4. A cam has at least one pair of spaced flat portions formed on its periphery, and an angle defining an upper limit value of a rotation angle of a rotary valve is provided between the flat portions, and the flat portions are provided between the flat portions. The rotation angle limiting mechanism for a rotary valve according to claim 1, wherein a surface that does not protrude from the portion is formed. 5. A pair of flat surface portions that define a first upper limit value and a second upper limit value of the rotation angle of the rotary valve are formed on the peripheral edge of one cam. 4. A rotation angle limiting mechanism for a rotary valve according to item 4. 6. An actuator comprising: a rotating shaft having a lower end having a fitting portion for fitting an upper end of a valve shaft of a rotary valve, and a rotating mechanism for rotating the rotating shaft. ,
A cam is removably attached to the lower end of the rotating shaft from the opening provided on the lower surface of the actuator, and the attached cam is rotated together with the rotating shaft, and the actuator collides with a specific part of the peripheral edge of the cam. An actuator characterized in that a stopper bolt for suppressing rotation of the cam is additionally provided, and the upper and / or lower limit of the rotation angle of the rotating shaft can be changed by attaching or detaching the cam.