JPH08270611A - Valve operating device - Google Patents

Abstract

PURPOSE: To prevent tumbling a spring by regulating turning a diaphragm plate of interposing a diaphragm with a diaphragm retainer. CONSTITUTION: Springs 9 opposed to a pressure in an air pressure chamber 6 are arranged in a spring chamber 7 partitioned by a diaphragm 5 in a pressure vessel 2. A stopper 32, provided in the spring chamber to set an upper or lower limit of a drive shaft 10, is protrusively provided in the periphery of a diaphragm plate 30 interposed between this spring and the diaphragm. A rotation- preventing member 41, engaged with partly an engaging protruded part 40 or stopper protrusively provided in any of the internal/external periphery of this stopper, is secured or swivelably provided in the inside of the pressure vessel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve operating device used for controlling opening / closing of a valve in response to changes in fluid pressure.

[0002]

2. Description of the Related Art A valve operating device used for a fluid control valve operates a valve shaft so as to obtain a predetermined driving stroke according to the air pressure applied to an air pressure chamber by utilizing the repulsive force of a spring. There are known two types, one using a diaphragm and the other using a piston and a cylinder, roughly classified by the drive type of the shaft.

FIG. 6 shows a conventional example of a diaphragm type valve operating device. This diaphragm type valve actuator 1
Is provided with a pressure vessel 2 composed of a pan-shaped lower case 2A and an upper case 2B which are vertically divided into two parts and are integrally coupled to each other, and the vessel 2 is provided integrally with a fluid control valve V. It is fixed on the yoke 3 by a plurality of bolts 4, and the inside is divided by a diaphragm 5 into two chambers 6 and 7. The lower chamber 6 forms an air pressure chamber (hereinafter referred to as the air pressure chamber 6) by being supplied with an air pressure P serving as a control signal from an air pressure supply port 8 provided in the lower case 2A via a pipe, while the upper chamber 6 is formed. The chamber 7 forms a spring chamber (hereinafter referred to as a spring chamber 7) by arranging a plurality of springs 9 formed of compression coil springs that face the air pressure P and urge the diaphragm 5 toward the air pressure chamber 6. ing.

The outer peripheral edge of the diaphragm 5 is the lower case 2A.
It is sandwiched by the joint surface between the upper case 2B and the upper case 2B, and a dish-shaped diaphragm plate 11 and a U-shaped upper limit stopper 12 that sets the upper limit of the drive shaft 10 are provided at the center of the upper surface, and the drive is provided at the center of the lower surface. A diaphragm retainer 13 is provided which sets the lower limit of the shaft 10 and also holds the diaphragm 5 together with the upper limit stopper 12 and also serves as a lower limit stopper that restricts the radial extension of the diaphragm 5.

The drive shaft 10 is slidably pierced through the lower case 2A, and the upper end of the drive shaft 10 penetrates the diaphragm retainer 13, the diaphragm 5, the diaphragm plate 11, and the upper limit stopper 12, which also serve as the lower limit stopper. A nut 14 is screwed onto the projecting end so that the diaphragm retainer 13, the diaphragm 5, the diaphragm plate 11 and the upper limit stopper 12 are integrally fastened together.
The diaphragm 5 and the diaphragm plate 11 are held by the upper limit stopper 12 and the diaphragm retainer 13. On the other hand, the drive shaft 10 protruding outward from the lower case 2A
The lower end portion of the O is inserted into the guide hole 15 provided in the yoke 3.
It is slidably inserted through a ring 16, and the lower end is connected to the upper end of a valve shaft 17 of the valve V through a coupling 18.

Reference numeral 19 is a spring plate provided on the upper surface of the diaphragm plate 11 for positioning and regulating the movement of each spring 9, 20 is a pointer provided on the coupling 18, and 21 is a scale for displaying the valve opening of the valve. Board, 2
2 is a vent for opening the spring chamber 7 to the atmosphere, 2
Reference numerals 3 and 24 denote bolts and nuts that integrally connect the lower case 2A and the upper case 2B.

In the state shown in FIG. 6 in which the lower limit stopper by the diaphragm retainer 13 is in contact with the inner surface of the lower case 2A, the valve shaft 17 is at the lower limit position and holds the valve in the fully closed state. From this state, the required air pressure P in the air pressure chamber 6
When (1.4 to 2.8 Kg / cm ² ) is introduced from the air pressure supply port 8, the pressure in the air pressure chamber 6 rises, so that the diaphragm 5 rises against the spring 9, which causes the valve shaft 17 to move. It rises integrally with the drive shaft 10 and opens the valve V according to the supply air pressure P. Then, the valve V is fully opened (100
%), The upper end surface 12a of the upper limit stopper 12 approaches the inner surface of the upper case 2B and is not yet in contact with the upper surface 12a, and the drive shaft is 1
When 0 rises and opens up to 110%, for example, upper case 2B
It contacts the inner surface of the spring and suppresses an increase in the stress of the spring 9. When the pressure in the air pressure chamber 6 decreases, the diaphragm 5 returns to the lower position by the elastic force of the spring 9 and closes the valve V.

Here, the type in which the valve shaft 17 is raised by the supply of the air pressure P to open the valve V is referred to as a reverse operation type valve operating device. On the other hand, contrary to FIG. 6, the type in which the air pressure chamber 6 and the spring chamber 7 are provided upside down and the valve shaft 17 is lowered by the supply of the air pressure P to close the valve V is called a direct-acting valve operating device. .

[0009]

According to the conventional valve operating device 1 as described above, the diaphragm 5 is sandwiched between the diaphragm retainer 13 also functioning as the lower limit stopper and the diaphragm plate 11, and the diaphragm plate 11 is provided. By tightening the upper limit stopper 12 stacked via the upper end of the drive shaft 10 with the nut 14 and pressing it,
These parts were assembled together. Then, these components are integrated on the drive shaft 10 by a frictional force obtained by tightening with the nut 14, and are vertically moved so as to drive the valve shaft 17 in response to the supply of the air pressure P to the air pressure chamber 6. It has become.

However, as described above, the four parts of the diaphragm retainer 13, the diaphragm 5, the diaphragm plate 11, and the upper limit stopper 12 are attached to the upper end of the drive shaft 10 by the nut 14.
In the structure of tightening and fixing by the above, there is a problem that the number of parts is large, the manufacturing and assembling work is troublesome, and when the number of parts is large, the nut 14 is easily loosened due to vibration or the like.

In the pressure contact structure by such tightening, if the tightening of the nut 14 becomes loose over time and loosens, or the diaphragm 5 itself deteriorates due to secular change, the pressure contact force between the parts decreases. The frictional force becomes small, and the diaphragm plate 11 may loosen and rotate in the circumferential direction. In particular, since the diaphragm 9 is provided with the spring 9 between it and the upper case 2B of the pressure vessel 2, when the diaphragm 11 rotates, the spring 9 collapses to open / close the valve V. There was a risk that control could not be performed.

That is, in the valve operating device 1 described above, the spring 9 arranged with one end in contact with the upper case 2B and the other end in contact with the diaphragm plate 11 is installed in the pressure vessel 2 as follows. It is not always standing vertically, and if it is installed with a slight inclination, a force for rotating the diaphragm plate 11 acts about the side with which the upper case 2B is in contact as the axis during repeated expansion and contraction. The rotation of the diaphragm plate 11 is restricted only by the frictional force between the parts due to the tightening with the nut 14 as described above, and the effect of the fatigue of the diaphragm 5 is exerted. May fall.

In particular, according to the valve operating device 1, when the spring 9 falls down as described above, the opening / closing control of the valve V cannot be performed, and for example, the valve V remains open or closed. Therefore, it is desired to take some measures capable of solving such a fall problem of the spring 9.

The present invention has been made in view of the above circumstances, and prevents the rotation of a diaphragm plate which is fixed by laminating and clamping the diaphragm on a drive shaft in a closed container which is a diaphragm case and prevents the spring from rotating. The purpose is to obtain a valve actuator that does not fall.

[0015]

In order to meet the above-mentioned demands, a valve operating device according to the present invention is a spring provided in a spring chamber defined by a diaphragm of a pressure vessel so as to face the pressure in the pneumatic chamber. And a diaphragm plate interposed between the diaphragm and the diaphragm.A stopper is provided on the outer periphery of the diaphragm plate to set the rising or falling limit of the drive shaft in the spring chamber.
A rotation preventing member is provided inside the pressure vessel, which engages with an engaging protrusion that is provided on either the inside or the outside of the stopper so as not to interfere with the vertical movement of the engaging protrusion.

Further, the valve operating device according to the present invention is a diaphragm plate interposed between a spring and a diaphragm, which is arranged in a spring chamber defined by the diaphragm of the pressure vessel so as to face the pressure in the pneumatic chamber. A stopper for setting the upper limit or lower limit of the drive shaft in the spring chamber is projectingly provided on the outer periphery of the diaphragm plate, and a rotation preventing member that engages with a part of the stopper is swingable inside the pressure vessel. It was provided.

[0017]

According to the present invention, the rotation preventing member provided on the inside of the pressure vessel is provided on the engagement protrusion provided on either the outer periphery or the outer periphery of the stopper provided on the outer periphery of the diaphragm plate. The diaphragm plate is prevented from rotating by engaging the vertical plate without disturbing the vertical movement.

Further, according to the present invention, the rotation preventing member provided on the inner side of the pressure vessel so as to be swingable is engaged with a part of the stopper provided on the outer periphery of the diaphragm plate so as to swing the rotation preventing member. The swinging motion prevents the diaphragm plate from rotating regardless of its vertical movement.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view of an essential part showing an embodiment of a diaphragm type valve operating device according to the present invention, FIG.
(B) is the top view and sectional drawing of a diaphragm plate. In these figures, the same or corresponding parts as those in FIG. 6 described above are designated by the same reference numerals, and detailed description thereof will be omitted. In these figures, in the present embodiment, the diaphragm plate 30 is made of a casting of aluminum alloy, iron, or the like, and has a disk-shaped bottom plate portion 30A, and an annular rising wall that is erected substantially vertically on the outer peripheral portion of the bottom plate portion 30A. It is formed in a dish shape consisting of 30B. Further, a plurality of spring receiving portions 31 are integrally provided on the upper surface of the bottom plate portion 30A, and a plurality of stoppers 32 are also integrally provided on the upper surface of the rising wall 30B. The diaphragm plate 30 is fixed to the upper end of the drive shaft 10 together with the diaphragm retainer 13 by a nut 14 that holds the diaphragm 5 with the diaphragm retainer 13 that also serves as a lower limit stopper.

The spring receiving portion 31 performs the same function as the spring plate 19 shown in FIG. 6 by positioning the spring 9 and restricting its movement, and is slightly smaller than the minimum inner diameter of the spring 9 used. Eight ring-shaped projections having a small outer diameter are formed at intervals of 45 ° in the circumferential direction of the diaphragm plate 30. The number of the spring receiving portions 31 can be increased or decreased depending on the spring constant of the spring 9 used. Around the spring receiving portion 31 on the upper surface of the bottom plate portion 30A, a movement regulating projection 33 for regulating the movement of the spring 9 in the circumferential direction and the radial direction of the diaphragm plate 30 is integrated with the diaphragm plate 30. Is projected on.

The stopper 32 fulfills the same function as the upper limit stopper 12 shown in FIG. 6 by contacting the inner surface of the upper case 2B when the drive shaft 10 is raised, and has an appropriate width, for example, the diaphragm plate 30. 4 are formed at intervals of 90 ° in the circumferential direction. Stopper 3
The thickness of 2 is set to be slightly thicker than the plate thickness of the rising wall 30B in order to enhance the strength, and the outer surface thereof forms the same surface as the outer peripheral surface of the rising wall 30B. A through hole 34 through which the drive shaft 10 penetrates is formed in the center of the bottom plate portion 30A.

Further, the above-mentioned diaphragm plate 3
Of the plurality of stoppers 32 protruding on the outer periphery of 0, at least one (two in this embodiment) stopper 32 is provided with an engaging protrusion 40 on the outer peripheral side. On the other hand, on the inside of the side wall of the upper case 2B of the pressure container 2, the rotation preventing member 41 that engages with the engagement protrusion 40 without disturbing the movement of the engagement protrusion 40 due to the vertical movement of the diaphragm plate 30.
Is stuck. Here, 41a in the figure is a rotation preventing member 4
1 is an engaging groove into which the engaging protrusion 40 formed in 1 is vertically movably engaged.

The structure other than the above is the same as that of the conventional valve operating device 1 shown in FIG. 6 described above.

In such a structure, since the stopper 32 forming the upper limit stopper, the spring receiving portion 31 forming the spring plate and the projection 33 are integrally formed on the diaphragm plate 30, the upper limit stopper and the spring plate are formed. Since it is not necessary to separately manufacture, the number of parts and the number of assembling steps can be reduced. Since the number of parts can be reduced, it is only necessary to fix the diaphragm 5, the diaphragm retainer 13 and the diaphragm plate 30 to the drive shaft 10 with the nut 14, so that the looseness of the nut 14 can be reduced.

Further, since the stopper 32 is provided on the outer periphery of the diaphragm plate 30, the height, width, thickness, etc. of the spring 9 can be freely determined regardless of the size of the spring 9, and the valve operating device can be designed. The degree of freedom can be expanded. Therefore, even if the spring 9 has a large diameter, the contact area between the stopper 32 and the upper case 2B can be set large, and when the stopper 32 contacts the upper case 2B, the upper case 2B is deformed. It is also possible to prevent the stopper itself from being damaged. Further, since the stopper 32 extends above the upper edge of the rising wall 30B and restricts the diaphragm 5 from being deformed inward of the diaphragm plate 30, the diaphragm 5 becomes large when the drive shaft 10 is lifted. It is less likely that the diaphragm 5 is deformed and comes into contact with the upper edge of the rising wall 30B or enters the inside of the diaphragm plate 30, and plastic deformation, damage, damage, etc. of the diaphragm 5 can be reduced.

Further, according to the above-mentioned structure, the upper case 2B of the pressure vessel 2 is fitted to the engaging projection 40 provided on the outer peripheral side of the stopper 32 projecting on the outer circumference of the diaphragm plate 30.
The rotation prevention of the diaphragm plate 30 can be prevented by engaging the anti-rotation member 41 provided on the inner side in a state where the vertical movement of the engagement protrusion 40 is not hindered. Therefore, in the conventional structure, the rotation of the diaphragm plate, which is caused by the loosening of the nut 14 and the fatigue of the diaphragm 5, can be reliably prevented regardless of the vertical movement of the diaphragm 5.

Further, in the above-mentioned structure, even if the diaphragm plate 30 moves up and down, the problem that the diaphragm 5 and the like come into contact with the rotation preventing member 41 does not occur. This is the engagement protrusion 40 with which the rotation preventing member 41 is engaged.
Is provided on the outer peripheral side of the stopper 32 protruding from the outer periphery of the diaphragm plate 30 to a predetermined height position, and the attachment position of the rotation preventing member 41 to the upper case 2B can be set to a high position.

FIG. 3 (a) is a sectional view showing the principal part of another embodiment of the present invention, and FIG. 3 (b) is a III-I section in (a).
It is the figure which crossed in II line. In this embodiment, in order to prevent the rotation of the diaphragm plate 30, the engaging protrusion 40 is provided on the inner peripheral side of the stopper 32 protruding on the outer periphery thereof. On the other hand, correspondingly to this, the rotation prevention having an approximately U-shaped cross section having an engagement groove 41a which engages with the engagement projection 40 in a state where the vertical movement thereof is not interfered with is formed inside the upper end portion of the upper cover 2B. The case where the member 41 is provided so as to hang down is shown.

Even with such a structure, the same effect as that of the above-described embodiment can be obtained. here,
The rotation preventing member 41 described above may be configured by a pair of engaging pieces 41b and 41c, as shown in FIG.

FIG. 4 is a sectional view of an essential part showing another embodiment of the present invention. Also in this figure, the same or corresponding parts as those in FIGS. Omit it. In this embodiment, an anti-rotation member having a substantially U-shape in a plan view, which is composed of a pair of engaging pieces 42a and 42b engaged with both ends in the circumferential direction, is provided on an upper end portion of a stopper 32 projecting from the outer periphery of the diaphragm plate 30. 42 is provided on the side wall of the upper cover 2B of the pressure vessel 2 via a hinge 43 so as to be vertically swingable.

According to this structure, the rotation prevention is achieved by engaging the engagement pieces 42a and 42b of the rotation preventing member 42 with both sides of the upper end of the stopper 32 on the outer periphery of the diaphragm plate 30 so as to be sandwiched. Hinge 43 of member 42
The diaphragm plate 30 is moved by the swinging motion of the diaphragm plate 30.
Can be prevented from rotating regardless of its vertical movement. Here, the rotation preventing member 42 may be engaged with one or two places of the stopper 32 provided on the diaphragm plate 30.

FIG. 5 shows a modification of the embodiment shown in FIG. 4 described above. In this embodiment, the diaphragm plate 30
The engaging protrusions 44a and 44b are provided on both sides in the circumferential direction at the upper end portion of the stopper 32 that is provided on the outer periphery of the engaging protrusion 44.
Between the a and 44b and the outer peripheral upper edge of the diaphragm plate 32, the engaging pieces 42a and 4 of the U-shaped rotation preventing member 42 are provided.
The case where 2b is engaged and provided is shown. According to such a configuration, the same effect as that of the above-described embodiment can be obtained, and there is no fear that the rotation preventing member 42 is accidentally rotated by the hinge 43 and comes off the stopper 32. Therefore, the present invention is effective when applied to the reverse-acting valve operating device 1.

The present invention is not limited to the structure of the embodiment described above, and it goes without saying that the structure, shape, etc. of each part can be changed as appropriate. For example, various modifications are conceivable as the engaging projection 40, the engaging projections 44a and 44b provided on the stopper 32, and the shape of the stopper upper end, which characterize the present invention. Of course, corresponding to this, the rotation preventing members 41, 4
The shape of 2 and the like may be modified.

[0034]

As described above, according to the valve operating device of the present invention, the engaging protrusion is provided on either the outer periphery or the outer periphery of the stopper projecting on the outer periphery of the diaphragm plate. An anti-rotation member that engages without disturbing the vertical movement of the protrusion is fixedly provided inside the pressure container, or an anti-rotation member that engages part of the stopper is provided inside the pressure container so that it can swing. Thus, despite the simple structure, it is possible to reliably prevent the rotation of the diaphragm plate, which is laminated and tightened on the diaphragm on the drive shaft in the closed container which is the diaphragm case.

Therefore, according to the present invention, the required valve control can be performed without causing the problem of the spring tilting accompanying the rotation of the diaphragm plate, which has been a conventional problem. Further, according to the present invention, since the stopper is located at a position higher than that of the conventional diaphragm plate, it is possible to restrict the deformation of the diaphragm and the like, and it is possible to lengthen the stroke as a valve operating device.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a diaphragm type valve operating device according to the present invention.

2A is a plan view of a diaphragm plate, FIG.
(B) is sectional drawing of the same plate.

3 (a) is a sectional view of a main part showing another embodiment of the valve operating device according to the present invention, FIG. 3 (b) is a sectional view taken along the line III-III of FIG. 3 (a), and FIG. It is a figure which shows a modification.

FIG. 4 is a cross-sectional view of essential parts showing another embodiment of the valve operating device of the present invention.

5 is a cross-sectional view of a main part showing a modified example of the valve operating device of FIG.

FIG. 6 is a cross-sectional view showing a conventional example of a diaphragm type valve operating device.

[Explanation of symbols]

1 ... Valve operating device, 2 ... Pressure vessel, 2A ... Lower case, 2
B ... Upper case, 3 ... Yoke, 5 ... Diaphragm, 6 ... Air pressure chamber, 7 ... Spring chamber, 8 ... Air pressure supply port, 9 ... Spring, 10 ... Drive shaft, 13 ... Diaphragm retainer also serving as lower limit stopper, 17 ... Valve Shaft, 30 ... Diaphragm plate, 31 ... Spring receiving portion, 32 ... Stopper, 4
0 ... Engagement protrusion, 41, 42 ... Rotation preventing member, 41a ... Engagement groove, 41b, 41c; 42a, 42b ... Engagement piece, 43
... hinges, 44a, 44b ... engaging projections.

Claims (2)

[Claims] 1. A pressure vessel whose inside is defined by a diaphragm into an air pressure chamber and a spring chamber, a spring which is disposed in the spring chamber and faces the pressure in the air pressure chamber, and between the spring and the diaphragm. A stopper that includes an intervening diaphragm plate and that sets the ascending limit or the descending limit of the drive shaft in the spring chamber is provided so as to project on the outer periphery of the diaphragm plate. A valve operating device characterized in that a rotation preventing member which engages with an engagement protrusion provided is provided inside the pressure vessel. 2. A pressure vessel whose inside is defined by a diaphragm into an air pressure chamber and a spring chamber, a spring which is arranged in the spring chamber and faces the pressure in the air pressure chamber, and between the spring and the diaphragm. An intervening diaphragm plate is provided, and a stopper for setting the ascending or descending limit of the drive shaft in the spring chamber is provided on the outer periphery of the diaphragm plate so as to prevent rotation that engages with a part of the stopper. A valve operating device, wherein a member is swingably provided inside the pressure vessel.