JPH08200313A - Valve actuator - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of parts and improve assembly workability.
Also, the nut is prevented from loosening, the stopper is not affected by the size of the spring, and the contact area between the stopper and the pressure vessel can be increased, reducing the concentration of stress when the stopper contacts the pressure vessel. To do. [Structure] A plurality of spring receiving portions 31 and a plurality of stoppers 32 are integrally projected on a diaphragm plate 30. The spring receiving portion 31 positions the spring 9 and prevents its movement. The stopper 32 is provided on the outer periphery of the diaphragm plate 30, and the upper case 2
By contacting B, the upper limit of the valve opening is defined.

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 for controlling the opening / closing of a valve in response to changes in fluid pressure.

[0002]

2. Description of the Related Art A valve operating device of this type used for a fluid control valve uses a repulsive force of a spring to operate a valve shaft so as to obtain a predetermined driving stroke according to an air pressure applied to a pneumatic chamber. There are two types known, a type using a diaphragm and a type using a piston and a cylinder, according to the drive type of the valve shaft, and the present invention can be applied to any of them.

FIG. 7 is a sectional view showing a conventional example of a diaphragm type valve operating device. This diaphragm type valve operating device 1 is provided with a pressure container 2 composed of a pan-shaped lower case 2A and an upper case 2B which are vertically divided into two parts and are integrally connected to each other. It is fixed by a plurality of bolts 4 on a yoke 3 which is integrally provided on the inside of the chamber, and the inside is divided into two chambers 6 and 7 by a diaphragm 5. The lower chamber 6 forms an air pressure chamber by the air pressure P serving as a control signal being supplied from an air pressure supply port 8 provided in the lower case 2A via a pipe, while the upper chamber 7 faces the air pressure P. A spring chamber is formed by disposing a plurality of springs 9 composed of compression coil springs that bias the diaphragm 5 toward the air pressure chamber 6.

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 lower limit stopper 13 is provided which sets the lower limit of the shaft 10 and holds the diaphragm 5 with the upper limit stopper 12 to restrict the radial extension thereof.

The drive shaft 10 slidably extends vertically through the lower case 2A, the upper end of which extends through the lower limit stopper 13, the diaphragm 5, the diaphragm plate 11 and the upper limit stopper 12, and a nut at the protruding end thereof. The lower limit stopper 13, the diaphragm 5, the diaphragm plate 11, and the upper limit stopper 12 are screwed together.
Are integrally fixed together, and the diaphragm 5 is held by the upper limit stopper 12 and the lower limit stopper 13. On the other hand, the lower end portion of the drive shaft 10 projecting outward from the lower case 2A is slidably inserted through a guide hole 15 provided in the yoke 3 via an O-ring 16, and the lower end portion of the valve shaft 1 of the valve A.
The upper end of 7 is connected via a coupling 18.

A plurality of spring plates 19 are provided on the upper surface of the diaphragm plate 11 to position each spring 9 and prevent its movement. The spring plate 19 is formed of a thin metal plate or the like, and is provided with a folded portion 19a (a hatched portion A in FIG. 8A) for positioning the spring 9.

Reference numeral 20 is a pointer provided on the coupling 18, 21 is a scale plate for displaying the valve opening of the valve, 22 is a ventilation hole for opening the spring chamber 7 to the atmosphere, 23, 2
Reference numeral 4 denotes a bolt and a nut that integrally connect the lower case 2A and the upper case 2B.

As shown in FIG. 7, when the lower limit stopper 13 is in contact with the inner surface of the lower case 2A, the valve shaft 17 is at the lower limit position and keeps the valve fully closed. From this state, the required air pressure P (1.4 to 2.8 Kg in the air pressure chamber 6)
/ 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.
And the valve is opened according to the supply air pressure P. When the valve is fully open (100%), the upper limit stopper 1
The upper end surface 12a of 2 is close to the inner surface of the upper case 2B and is not yet in contact therewith, and the drive shaft 10 is further raised to, for example, 110%.
When it is fully opened, it comes into contact with the inner surface of the upper case 2B and suppresses an increase in the stress of the spring 9. When the pressure in the pneumatic chamber 6 decreases, the diaphragm 5 is returned to the lower position by the elastic force of the spring 9 to close the valve.

Incidentally, such a type in which the valve shaft 17 is raised by the supply of the air pressure P to open the valve is called a reverse operation type valve operating device. On the other hand, the air pressure chamber 6 and the spring chamber 7 are provided upside down, and the valve shaft 1 is supplied by the air pressure P.
The type that lowers 7 and closes the valve is called a direct-acting type valve actuator.

[0010]

However, in such a conventional valve operating device 1, the upper limit stopper 12 is used.
Since it is arranged in the center of the diaphragm plate 11, it is difficult to secure a place for disposing the upper limit stopper 12, and there is a problem that the degree of freedom in design is small. That is, FIG.
When the diameter of the spring 9 is small as shown in (a), there is no problem at all, but when the diameter is large, the upper limit stopper 12 has to be made smaller, and therefore, as shown in FIG. In order to avoid mutual interference with the spring 9, the width W of the contact surface 12a must be set small. As a result, the contact area between the contact surface 12a and the upper case 2B becomes smaller, and the upper limit stopper 12 may deform the upper case 2B or damage the stopper itself.

Further, since the four members of the diaphragm 5, the diaphragm plate 11, the upper limit stopper 12 and the lower limit stopper 13 are fixed to the upper end portion of the drive shaft 10 by the nuts 14, the number of parts is large, and the manufacturing and assembling work is difficult. Not only is it troublesome, but when the number of parts is large, the nut 14 is likely to loosen due to vibration or the like.

Further, since the height of the ring-shaped rising wall 11a provided on the outer periphery of the diaphragm plate 11 is generally low, the diaphragm 5 is moved upward as the drive shaft 10 rises.
When it is greatly deformed as shown by the chain double-dashed line, the rising wall 11a
There is a problem that it may be damaged, damaged, or plastically deformed because it hits the upper edge or enters the inside of the diaphragm plate 11. In order to solve such a problem, the rising wall 11a may be formed high, but in that case, the weight of the diaphragm plate 11 itself increases, which affects the operating speed of the valve, which is not preferable. In addition, since the spring plate 19 is required, there is a problem that the number of parts is further increased.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to reduce the number of parts, improve the assembling workability, and prevent loosening of the nut. It is to provide a valve operating device adapted to obtain. Further, in the present invention, the stopper for setting the upper limit or the lower limit of the drive shaft is not affected by the size of the spring, the contact area between the stopper and the pressure vessel can be increased, and the stopper contacts the pressure vessel. (EN) Provided is a valve operating device capable of relieving stress concentration at the time.

[0014]

In order to achieve the above-mentioned object, the present invention provides a pressure vessel whose interior is defined by a diaphragm into an air pressure chamber and a spring chamber, and a pressure container which is disposed in the spring chamber. And a diaphragm plate interposed between the spring and the diaphragm, and a stopper in the spring chamber for setting an ascending limit or a descending limit of the drive shaft. It is characterized in that it is provided on the outer periphery of. Further, the present invention provides a pressure vessel, the interior of which is defined by a piston into an air pressure chamber and a spring chamber, a spring which is arranged in the spring chamber and faces a pressure in the air pressure chamber, and a drive shaft in the spring chamber. A stopper for setting an ascending limit or a descending limit is provided, and this stopper is provided so as to project on the outer circumference of the piston.

[0015]

In the present invention, the height of the stopper provided on the diaphragm plate sets the upper limit or lower limit of the drive shaft. Also, since the stopper is provided on the outer circumference of the diaphragm plate or piston, the height, width, number, etc. of the stopper can be determined regardless of the size of the spring.In the diaphragm type, the stopper is the same as the rising wall of the diaphragm plate. Since a part of the diaphragm is formed to suppress the deformation of the diaphragm, when the diaphragm is largely deformed, it is difficult for the diaphragm to hit the upper edge of the rising wall or enter the inside of the diaphragm plate.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. 1 is a sectional view showing an embodiment in which the present invention is applied to a diaphragm type valve operating device, FIG. 2 is a plan view of a diaphragm plate, and FIG. 3 is a sectional view of the plate. It should be noted that the same components and the like as those described in the section of the prior art in the figure are denoted by the same reference numerals, and detailed description thereof will be omitted. In these drawings, in this embodiment, the diaphragm plate 30 is made of a casting such as an aluminum alloy or iron, and has a disk-shaped bottom plate portion 30A, and an annular rising wall 30B that is erected substantially vertically on the outer peripheral portion of the bottom plate portion 30A. It is shaped like a dish consisting of. 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. Further, the diaphragm plate 30 is fixed to the upper end of the drive shaft 10 together with the lower limit stopper 13 by a nut 14 by sandwiching the diaphragm 5 with the lower limit stopper 13.

The spring receiving portion 31 performs the same function as the spring plate 19 shown in FIG. 7 by positioning the spring 9 and restricting its movement, and is slightly smaller than the minimum inner diameter of the spring 9 used. It is composed of ring-shaped protrusions having a small outer diameter, and is spaced by 45 ° in the circumferential direction of the diaphragm plate 30, for example, 8
Individually formed. The number of spring receiving portions 31 is
It can be increased or decreased depending on the spring constant of the spring 9 used. Further, around the spring receiving portion 31 on the upper surface of the bottom plate portion 30A, there is provided a protrusion 33 for restricting movement which restricts the spring 9 from moving in the circumferential direction and the radial direction of the diaphragm plate 30.
It is projected integrally with.

The stopper 32 fulfills the same function as the upper limit stopper 12 shown in FIG. 7 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. 9 in the circumferential direction
Four pieces are formed at intervals of 0 °. Stopper 32
Is thicker than the plate thickness of the rising wall 30B in order to increase the strength, and its outer surface is flush with 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. The rest of the configuration is similar to that of the conventional valve operating device shown in FIG.

In the diaphragm type valve operator having such a structure, the diaphragm plate 30 is integrally formed with the stopper 32 forming the upper limit stopper, the spring receiving portion 31 forming the spring plate and the projection 33. Therefore, it is not necessary to separately manufacture the upper limit stopper and the spring plate, and the number of parts and the number of assembling steps can be reduced. Further, since the stopper 32 is projectingly provided on the outer periphery of the diaphragm plate 30, the height, width, thickness and the like of the spring 9 can be freely determined regardless of the size of the spring 9, and the degree of freedom in designing the valve operating device can be increased. Can be increased. 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 may be deformed. It is possible to prevent the stopper itself from being damaged. Further, if the number of parts is reduced, it is only necessary to fix the diaphragm 5, the lower limit stopper 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 extends above the upper edge of the rising wall 30B to prevent the diaphragm 5 from being deformed inward of the diaphragm plate 30, the diaphragm 5 becomes large when the drive shaft 10 is raised. It deforms and abuts the upper edge of the rising wall 30B, or the diaphragm plate 3
It is less likely that the diaphragm 5 will enter the inside of the diaphragm 0, and plastic deformation, damage, damage, etc. of the diaphragm 5 can be reduced.

FIG. 4 is a plan view showing another embodiment of the diaphragm plate, and FIG. 5 is a sectional view of the plate. In this embodiment, the diaphragm plate 30 is replaced by the disc-shaped bottom plate portion 3.
0A and a ring-shaped rising wall 30B that stands substantially vertically on the outer peripheral portion of the bottom plate portion 30A. Further, a plurality of spring receiving portions 31 are provided on the upper surface of the bottom plate portion 30A,
The spring 9 is located between the adjacent spring receiving portions 31.
Is integrally provided with a Y-shaped movement restricting protrusion 37 for restricting the movement of the diaphragm plate 30 in the circumferential direction, and a plurality of stoppers 3 are similarly provided on the upper surface of the rising wall 30B.
2 are integrally projected, and the spring 9 is moved in the radial direction of the diaphragm plate 30 at a position corresponding to each spring receiving portion 31 on the upper surface of the bottom surface portion 30A and the inner peripheral surface of the rising wall 30B. A plurality of convex portions 38, 39 for regulating
Are projected integrally.

The length of the movement restricting projection 37 is set to be substantially equal to or less than the outer diameter of the spring receiving portion 31. Inner convex portion 38 and spring receiving portion 3
An annular gap capable of accommodating the lower end of one spring 9 ′ is formed between 1 and the movement restricting projection 37. Similarly, the spring 9 ′ is also provided between the outer convex portion 39, the spring receiving portion 31, and the movement regulating projection 37.
An annular gap that can accommodate the lower end of one spring 9 ″ having a larger diameter is formed. Other configurations are the same as those in the above embodiment.

In such a structure, the length of the movement restricting protrusion 37 is set to be substantially equal to or less than the outer diameter of the spring receiving portion 31, and the spring receiving portion 31 is set.
Since a continuous annular gap is provided between each of the convex portions 38 and the convex portions 38 and 39, the valve operating device is not limited to the valve operating device using the small-diameter spring 9 arranged in the spring receiving portion 31. One spring 9'or a larger spring 9 '' or a valve actuator using these two springs 9 ', 9''can be constructed.

FIG. 6 is a sectional view showing another embodiment in which the present invention is applied to a piston / cylinder type valve operating device. In this piston-cylinder type valve operating device, a cylinder 41 is provided in the pressure vessel 2 via a cylindrical partition member 42, and a piston 43 is slidably fitted in the cylinder 41 via an O-ring 44. These define the interior of the pressure vessel 2 into a pneumatic chamber 6 and a spring chamber 7. In this case, in the figure, the cylinder 41
Although the pressure vessel 2 provided with the pressure vessel 2 is shown, the inner wall of the pressure vessel 2 itself serves as a sliding surface of the piston 43.
It is also possible to use a cylinder for both.

On the lower surface of the peripheral wall portion of the piston 43, a plurality of stoppers 46 forming a lower limit stopper for setting the lower limit of the drive shaft 10 are integrally provided at predetermined intervals in the circumferential direction. Further, a spring receiving portion 47 for positioning the spring 9 is integrally projectingly provided on the inner bottom surface of the piston 43. 49 is a guide.

Here, in this embodiment, by providing the air pressure chamber 6 above the spring chamber 7, the valve shaft 17 is lowered integrally with the drive shaft 10 by the supply of the air pressure P to close the valve, that is, 4 shows a positive acting valve actuator. Other configurations are the same as those of the diaphragm type valve operating device described above.

Even in such a structure, the stopper 4 for setting the lower limit of the drive shaft 10 on the lower surface of the peripheral wall portion of the piston 43.
Since 6 is integrally provided, the same effect as that of the diaphragm type valve operating device described above can be obtained. That is, it is not necessary to provide a lower limit stopper formed of a separate member inside the piston 43, the number of parts can be reduced, and the assembling work is simple and easy. Further, the width, number, height, thickness, etc. of the stopper 43 can be freely set regardless of the size of the spring 9, so that the contact area with the lower case 2A can be set large and the stopper 43 can be set. It is possible to prevent the lower case 2A from being deformed and the stopper itself from being damaged when 43 contacts the lower case 2A.

If the lower limit stopper formed of a separate member is not required, the loosening of the nut 14 can be prevented. Furthermore, the spring receiving portion 47 is attached to the piston 43.
The number of parts can be further reduced because it is integrally provided in the.

In each of the above embodiments, the stopper 3 is used.
Although the case where a plurality of 2, 46 are provided has been described, the present invention is not limited to this and may be a continuous annular or C-shaped one. In the present invention, the stopper 32 is integrally formed with the diaphragm plate 30 in the diaphragm type, and the stopper 46 is integrally formed with the piston 43 in the piston / cylinder type. It may be fixed by. Even in that case, since there is no upper limit or lower limit stopper fixed by the nut 14, the effect of less loosening of the nut 14 can be achieved.

[0030]

As described above, the valve actuator according to the present invention is provided with the stopper for setting the upper limit or the lower limit of the drive shaft, and the stopper is provided on the outer periphery of the diaphragm plate or the piston. The height, width, thickness, etc. of the spring can be freely determined regardless of the size of the spring, and the degree of freedom in designing the valve operator can be increased. Therefore, even if the spring has a large diameter, the contact area between the stopper and the pressure vessel can be set large, and deformation of the vessel when the stopper abuts the pressure vessel and damage to the stopper itself are prevented. be able to. Further, since it is not necessary to fix the upper limit or the lower limit stopper to the drive shaft, it is possible to reduce the looseness of the nut.

Further, in the present invention, when the stopper is provided integrally with the diaphragm plate or the piston, the number of parts can be reduced, and the assembling work is simple and easy. Furthermore, if the diaphragm plate or the piston is integrally provided with the spring receiving portion, the number of parts can be further reduced and the assembling work can be further simplified, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment when the present invention is applied to a diaphragm type valve operating device.

FIG. 2 is a plan view of a diaphragm plate.

FIG. 3 is a sectional view of the plate.

FIG. 4 is a plan view showing another embodiment of the diaphragm plate.

FIG. 5 is a sectional view of the plate.

FIG. 6 is a cross-sectional view showing another embodiment when the present invention is applied to a piston / cylinder type valve operating device.

FIG. 7 is a cross-sectional view showing a conventional example of a diaphragm type valve operating device.

8A and 8B are views showing the relationship between a diaphragm plate and a spring.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve operation device, 2 ... Pressure container, 3 ... Yoke, 5 ... Diaphragm, 6 ... Air pressure chamber, 7 ... Spring chamber, 8 ... Air pressure supply port, 9 ... Spring, 10 ... Drive shaft, 12 ... Upper limit stopper, 13 ... Lower limit stopper, 17 ... Valve shaft, 19 ...
Spring plate, 30 ... Diaphragm plate, 3
DESCRIPTION OF SYMBOLS 1 ... Spring receiving part, 32 ... Stopper, 41 ... Cylinder, 43 ... Piston, 46 ... Stopper, 47 ... Spring receiving part.

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 arranged in the spring chamber and opposed to the pressure in the air pressure chamber, and between the spring and the diaphragm. A valve operating device comprising an intervening diaphragm plate and a stopper in the spring chamber for setting an ascending limit or a descending limit of a drive shaft, the stopper protruding from an outer periphery of the diaphragm plate. 2. A pressure vessel whose inside is defined by a piston into an air pressure chamber and a spring chamber, a spring arranged in the spring chamber and opposed to the pressure in the air pressure chamber, and a drive shaft in the spring chamber. A valve operating device, comprising: a stopper for setting an ascending limit or a descending limit, the stopper being provided so as to project on an outer circumference of the piston.