JP3571260B2 - Actuator for valve with manual mechanism - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an actuator for a valve with a manual mechanism, and more particularly to an actuator for a valve with a manual mechanism that can be easily manually operated with fingers and that the connection with the actuator can be reliably restored.
[0002]
[Prior art]
As this type of actuator, there is a drive system using electric power, pneumatic pressure, or the like as a drive source, and an automatic valve that opens or closes or controls a valve using this drive source is often used. However, for example, in the event of a power failure, actuator failure, or other emergency, it is necessary to manually open and close the valve.
[0003]
Therefore, in general, various mechanisms for manually operating the actuator are attached to the actuator. For example, a mechanism in which the shaft of the electric motor is directly rotated by a spanner or the like, or a mechanism in which the shaft of the electric motor and the valve stem are connected to each other by a clutch mechanism A method has been proposed in which the stem is rotated by a tool such as a wrench in a state where the stem is separated from the shaft through a hole (see Japanese Utility Model Laid-Open Nos. 54-92437 and 50-9829).
[0004]
In addition, a method has been proposed in which a dedicated shaft for manual operation is provided separately from the shaft of the electric motor, the dedicated shaft is separated from the shaft via a clutch mechanism, and the dedicated shaft is manually operated with an operating rod or a tool. (See Japanese Utility Model Application Laid-Open No. 60-16074).
[0005]
[Problems to be solved by the invention]
However, various conventional methods have the following problems. That is, the method of directly rotating the shaft of the electric motor requires a large manual operation force even if the valve operation force is small, and therefore requires a tool such as a spanner for operation.
In addition, the conventional method using a clutch mechanism requires a tool such as a wrench in any method, and requires a separate clutch mechanism, which complicates the structure and poses a problem in terms of compactness. Had.
[0006]
The present invention has been developed to solve the problems of conventional actuators. The object of the present invention is that the structure is simple and compact, and it is easy to use a finger without using a tool such as a spanner. In addition, the position of the manual opening and closing can be easily confirmed, and the automatic return after the manual operation can be smoothly performed.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is characterized in that an output shaft of an actuator having a built-in electric motor is rotatably fitted into a fitting hole of a cylindrical cam for regulating valve opening, and a lower end of the output shaft. And the upper end of the valve stem is fitted into a cylindrical ring member, and the output shaft and the valve stem are detachably connected to each other. The ring member is elastically moved in the axial direction of the output shaft via a spring. While being urged, the upper part of the ring member is non-rotatably and vertically movablely engaged with the cylindrical cam, and the ring member is pressed down against the spring to lower the output shaft and the stem. A valve actuator with a manual mechanism configured to engage the upper portion of the ring member with the cylindrical cam so as to be non-rotatable and movable up and down even when disconnected .
[0008]
The invention according to claim 2, before Symbol draft within grooves formed in the cylindrical cam, engaged the positioning pin fixed to the base body of the actuator freely guided.
According to a third aspect of the present invention, the engagement groove formed above the ring member is always non-rotatably engaged with the engagement protrusion formed on the inner periphery of the insertion hole of the cylindrical cam so as to be vertically movable. .
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, examples of the actuator with a manual mechanism according to the present invention will be described with reference to the drawings.
[0010]
1 to 9 show an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes an actuator, and a housing of the actuator 1 includes a cover 2a on a base 2 via an O-ring 2b.
Further, an electric motor 3 is provided in the actuator 1, and an output shaft 4 that rotates by using the electric motor 3 as a driving source is provided. A cylindrical cam 5 having the output shaft 4 provided on the base 2 is fitted. It is fitted in the hole 9. Further, in the actuator 1, micro switches 6a and 6b that are turned on and off while being in contact with and separated from the switch grooves 5a and 5b of the cylindrical cam 5 are provided in two stages. The switch grooves 5a and 5b are provided on the outer peripheral surface of the cam 5 at a vertical interval of about 90 °.
[0011]
As shown in FIGS. 6 to 8, an arc-shaped guide groove (in this example, a substantially 90-degree arc-shaped groove) 7 is formed in the cylindrical cam 5, and the guide groove 7 is formed in the base 2. The cam 5 is provided so as to rotate in a range of approximately 90 ° by engaging a positioning pin 8 provided integrally so as to be freely guided.
[0012]
Further, a step 5c is formed at the upper end of the insertion hole 9 of the cylindrical cam 5, and the step 4c is positioned by abutting the flange 4a of the output shaft 4 against the step 5c. An engagement protrusion 10 described later is formed. In the figure, reference numeral 11 denotes a power cable.
[0013]
1 to 4, a flange portion 13 is provided at the upper end of the shaft mounting portion 12a of the valve body 12, and in this example, particularly, the rotation of a ball valve, a butterfly valve, and the like, which is opened and closed by approximately 90 ° rotation. A valve is used. In this valve, a stem 14 for rotating a valve element such as a ball (not shown) is axially mounted on a shaft mounting portion 12a, and the stem 14 is configured to rotate while a sealing material 14a is hermetically mounted by an insert 14b. I have.
[0014]
In FIG. 5, a slightly longer split groove 15 is formed at the upper end of the stem 14, and the lower portion of the inverted T-shaped plate-like key 16 is connected to the split groove 15 so as to be vertically movable and non-rotatable. The key 16 is urged upward by the elastic force of a spring 17 mounted on the engaging portion 14c of the stem 14.
[0015]
As shown in FIGS. 5 and 9, the locking portion 16a formed at the lower portion of the key 16 is engaged with the locking groove 20 of the operation flange portion 19 provided at the lower portion of the cylindrical ring member 18. Then, the key 16 is fitted into the fitting hole 18 a of the ring member 18 from above.
[0016]
The locking groove 20 is formed in a direction intersecting with the axial direction of the ring member 18 and can be confirmed from the outside of the operation flange 19, so that the open / closed state of the valve can be visually recognized from the outside by the locking groove 20. be able to.
The ring member 18 is provided so as to be vertically movable in a fitting hole 21 formed in the base 2 of the actuator 1, and is arranged such that the upper surface of the flange 19 of the ring member 18 contacts the lower surface of the base 2. Provided to regulate the resilience of the spring 17.
[0017]
As shown in FIGS. 3 and 4, the key 16 is provided together with the ring member 18 so as to be able to be pushed down in the axial direction of the stem 14, and the upper end of the key 16 and the split groove 4b of the output shaft 4 are fitted. The two are connected so that they cannot rotate, and the key 16 is separated from the split groove 4b of the output shaft 4 and comes into contact with and separates from the split groove 4b when the ring member 18 is pressed down.
[0018]
In FIG. 5, a pair of engagement grooves 23 formed above the ring member 18 are always non-rotatably engaged with the engagement protrusions 10 formed on the inner periphery of the cylindrical cam 5 so as to be vertically movable. Then, the key 16 and the ring member 18 rotate with the rotation of the stem 14, and the cylindrical cam 5 also rotates at the same time, so that the open / close position of the valve can be accurately confirmed.
In the drawing, reference numeral 22 denotes a fixing bolt for mounting the actuator 1 on the flange portion 13.
[0019]
Next, the operation of the above embodiment will be described.
First, in FIGS. 1 and 2, when the electric motor 3 is turned on while the valve body of the valve is fully closed, the output shaft 4 rotates the stem 14 through the key 16 by approximately 90 ° to bring the valve into the fully open state. .
At this time, the microswitch 6b operates to turn off the electric motor 3, stop the valve opening operation, and turn on a lamp (not shown) indicating the valve opening state. Next, when the electric motor 3 is rotated by about 90 ° in the reverse direction, it turns to the position shown in FIG. 1 and the valve is fully closed.
[0020]
At this time, when the actuator 1 manually opens and closes the valve in the event of an emergency such as a power failure or failure, pressing the ring member 18 down by the stroke (S) in FIG. The key 16 descends in the split groove 15 of the stem 14 and the upper end of the key 16 comes off the split groove 4b of the output shaft 4.
[0021]
When the operation collar 19 of the ring member 18 is rotated by approximately 90 ° with the fingers while maintaining this state, the key 16 separated from the output shaft 4 is still connected to the stem 14, so that the operation force is small. Thus, the valve can be rotated as it is, and the valve can be operated from the fully closed state to the fully open state or from the fully open state to the fully closed state.
[0022]
At this time, since the engagement groove 23 of the ring member 18 is still engaged with the engagement protrusion 10 of the cam 5, the cam 5 rotates together with the ring member 18 and positions the guide groove 7 of the cam 5. While the pin 8 is being guided, as shown in FIG. 8, the pin 8 comes into contact with the end of the guide groove 7 and stops.
[0023]
Therefore, the guide groove 7 and the positioning pin 8 serve as a valve opening regulating member at the time of manual operation, and the valve can be reliably rotated within a predetermined 90 ° range. Further, since the position of the valve body of the valve and the position of the cylindrical cam 5 always rotate in conjunction with the same position, the opening / closing position of the valve is also controlled by the ring member 18 or by a micro switch that comes into contact with or separates from the cylindrical cam 5. Can be reliably confirmed, and erroneous recognition of the valve opening due to the displacement between the output shaft and the stem in the related art can be prevented.
[0024]
Next, when the finger is released from the ring member 18, the ring member 18 moves upward by the urging force of the spring 17. At this time, when the electric motor 3 is turned on, the output shaft 4 rotates and the upper end of the key 16 is When the split grooves 4b of the output shaft 4 coincide with each other, the upper end of the key 16 is fitted into the split groove 4b of the output shaft 4 and the key 16 and the output shaft 4 are connected. , The automatic return to the state where the opening and closing of the valve is automated is completed.
[0025]
Therefore, in the case of the automatic return after the manual operation as in the related art, it is troublesome to grasp the position of the output shaft in advance, manually operate the valve so that the stem is at the same position, and then connect the clutch mechanism. Since no work is required, automatic return can be easily performed, and erroneous operation can be prevented.
[0026]
The guide groove 7 and the positioning pin 8 function as members for determining the direction of rotation of the electric motor 3 when the electric motor 3 does not have directivity of rotation when the power is turned on (a so-called synchronous motor).
[0027]
10 to 14 show another embodiment of the valve actuator according to the present invention.
In this example, the same portions as those in the above-described embodiment are denoted by the same reference numerals, and the operation and effect thereof are also the same. Therefore, description thereof will be omitted, and only different portions will be described.
[0028]
In FIG. 13, the ring member 24 is different from the structure of the ring member 18 in that a lever 25 for manual operation is provided at a lower portion to further improve operability. Other operations of the ring member 24 are the same as those of the ring member 18.
A mounting groove 26 for sealing between the ring member 24 and the base 2 is formed, and an O-ring 27 is mounted in the mounting groove 26 to prevent water droplets from entering the actuator.
[0029]
An engagement groove 28 for engaging with the engagement protrusion 10 of the cam 5 is formed in an upper portion of the ring member 24, and further, the key 16 and the engagement portion 16 a are engaged and locked to the ring member 24. For this purpose, a locking groove 29 is formed on the inner periphery of the ring member 24.
[0030]
Further, a cylindrical portion 30 is provided below the ring member 24, and an inserted insert member 31 is inserted into the cylindrical portion 30, and a spring 17 arranged on a sealing portion of the valve stem 14 with an O-ring 32 is provided. By hermetically sealing, it is possible to avoid a situation in which water droplets generated due to dew condensation on the valve accumulate in the recess between the stem 14 and the insert member 31.
[0031]
【The invention's effect】
As is clear from the above, according to the present invention, it is possible to provide a product that is simple in structure, compact, and cost-effective compared to conventional products, and uses a tool such as a spanner at all. In addition, since the manual operation can be easily performed with fingers, the operability is facilitated, and the open / close position of the valve body during the manual operation can be easily confirmed.
[0032]
Further, since the vertical movement during the manual operation can be reliably operated in the axial direction, the opening and closing of the valve is ensured, and the connection with the output shaft of the actuator after the manual operation can be automatically and reliably performed. The switch cam enables accurate rotation operation and visual recognition of the valve opening position both during manual operation and automatic return.
[Brief description of the drawings]
FIG. 1 is a partial vertical sectional front view showing an example of an actuator with a manual mechanism according to the present invention.
FIG. 2 is a partially cutaway side view of FIG. 1;
FIG. 3 is a partial vertical sectional front view showing a state where a ring member of FIG. 1 is pushed down.
FIG. 4 is a partially cutaway side view showing a state where the ring member of FIG. 2 is pushed down.
FIG. 5 is a perspective view in which components of the manual mechanism of FIG. 1 are separated.
FIG. 6 is a plan view of the cam shown in FIG. 1;
FIG. 7 is a longitudinal sectional view of FIG.
FIG. 8 is a vertical sectional view taken along line AA of FIG. 7;
FIG. 9 is a sectional view showing a relationship between the ring member and the key in FIG. 1;
FIG. 10 is a partial longitudinal sectional view showing another example of the actuator with a manual mechanism in the present invention.
11 is a longitudinal sectional side view showing a state where a ring member in FIG. 10 is pushed down.
FIG. 12 is a plan view of FIG. 10;
FIG. 13 is a perspective view in which components of the manual mechanism of FIG. 10 are separated.
14 is a longitudinal sectional view of the ring member in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Actuator 2 Base 3 Electric motor 4 Output shaft 4b Split groove 5 Cylindrical cam 7 Guide groove 8 Positioning pin 9 Fitting hole 10 Engagement projection 12 Body 14 Stem 15 Split groove 16 Key 17 Spring 18, 24 Ring member 19 For operation Flange 20 Locking groove 21 Fitting hole 23 Engaging groove 25 Manual operation lever 30 Cylindrical part

Claims (3)

The output shaft of the actuator incorporating the electric motor is rotatably fitted into the fitting hole of the cylindrical cam for regulating the valve opening, and the lower end of the output shaft and the upper end of the valve stem are fitted into a cylindrical ring member. The output shaft is connected to the valve stem so as to be detachable, the ring member is resiliently urged in the axial direction of the output shaft via a spring, and the upper part of the ring member is formed in the cylindrical shape. Even when the output shaft and stem are separated by pushing the ring member down against the spring so as to be non-rotatably engaged with the cam and vertically movable, the upper portion of the ring member is An actuator for a valve with a manual mechanism, wherein the actuator is configured to engage with a cylindrical cam so as to be non-rotatable and vertically movable . Before Symbol draft within grooves formed in the cylindrical cam, manual mechanism with an actuator valve according to claim 1 engaged with the positioning pin fixed to the base body of the actuator freely guided. 3. The engagement cam according to claim 1 , wherein an engagement groove formed above the ring member is always non-rotatably engaged with an engagement protrusion formed on an inner periphery of the insertion hole of the cylindrical cam . Valve actuator with manual mechanism.

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