JP4245188B2 - Valve drive device - Google Patents

Description

【Technical field】
[0001]
The present invention relates to a valve driving device for applying a driving force to a valve rod of a valve device configured to open and close the valve by rotating the valve rod, such as a butterfly valve, a ball valve, and the like. The present invention relates to a valve driving device capable of switching the driving of a valve between manual and automatic.
[Background]
[0002]
The valve drive system in a valve device such as a butterfly valve can be broadly divided into two systems: manual and automatic. In recent years, the demand for automatic devices or valve drive actuators that can be remotely operated and centrally managed has increased and the importance has increased with the automation and new establishment of plants and devices. In order to automate the plant, equipment, etc., the safety of the equipment itself, ease of maintenance, etc. are required, and manual operation on the machine side is required in an emergency, inspection after maintenance, confirmation, and trial operation.
[0003]
In order to satisfy the above requirements, it is necessary for an automatic type valve device to drive a valve mainly electrically, and to be able to drive manually if necessary. Automatic / manual switching devices have been proposed. However, there are problems such as complicated structure, short life, and complicated operation.
[0004]
For the purpose of solving such problems, the applicant of the present application has previously proposed the technique described in Patent Document 1. According to the device disclosed in Patent Document 1, it is possible to drive both automatically and manually with a single actuator, so that manual operation can be performed while the electric operation is reliably cut off during manual operation. It is excellent in that the safety of a manual operator can be ensured reliably. However, in the case of a valve driving device having a structure having both a manual mechanism unit and an automatic mechanism unit, it is expensive to use it in a place where only the manual method is required, and there is a waste of excessive functions. . Actually, depending on the plant and equipment, it is sometimes decided to assemble a manual valve device without automating only a specific part from the viewpoint of improving safety, etc. In such a case, an automatic mechanism is provided. There is a need for a manual valve drive system consisting only of manual mechanisms that are not.
[0005]
In other words, nowadays, the automation of plants and equipment is progressing, and of course, the demand for automatic valve devices is increasing, but the need for manual valve devices is also increasing. The situation is that both have demand.
[0006]
In general, manual and automatic actuators are ordered according to the pre-designed quantities when automating or newly installing plants and equipment. It may be forced to change. In such a case, it is an accessory that the surplus product is produced. In addition, if it is necessary to replace the manual device mounting position with the automatic device mounting position after mounting various actuators, all of the automatic and manual devices must be removed, and the mounting and adjusting operations must be performed again. There is a problem that must be.
Patent Document 1: Japanese Patent No. 2787402 Disclosure of Invention Problems to be Solved by the Invention [0007]
According to the present invention, an automatic mechanism can be detachably assembled to the valve drive mechanism without changing the internal configuration of the manual valve drive mechanism, and the drive force generated by the drive force generating means of the automation mechanism can be A valve drive device that is configured to be able to drive a valve either manually or automatically by transmitting to a manual type valve drive mechanism, and to allow removal of an automated mechanism portion assembled as necessary. It is to be provided.
Means for Solving the Problems
In order to solve the above problems, the present invention adopts a drive shaft that is rotatably supported in a casing and has one end extending outside the casing, and a drive force from the outside in conjunction with the drive shaft. A basic unit including a driving force transmission mechanism for transmitting to the rod coupling body, and an independent additional unit including an automatic driving force generating means and a deceleration transmission mechanism for transmitting the driving force in the housing. A handle for manual operation is detachably attached to the tip of the drive shaft extending from the casing to the outside, a keyhole is provided on the drive shaft outside the casing, and a gear connected to the deceleration transmission mechanism of the independent additional unit is provided. The drive shaft can be connected to the drive shaft by the key inserted into the keyhole, and an independent additional unit is separably connected to the basic unit to drive the automatic drive force generating means. Is transmitted to the drive shaft via the power transmission mechanism and the gear, so that the manual valve drive mechanism by the handle is changed at any time at the time of inventory after production and installation of piping. Without being able to open and close the valve as an automatic drive type valve, the automatic drive force generation means is composed of an electric drive means, and a substantially L-shaped box together with a power transmission means for transmitting the drive force to the drive shaft It is characterized by constituting an independent additional unit incorporated in a shaped housing .
[0010]
An opening degree display device capable of visually recognizing the opening degree of the valve in conjunction with the rotation angle of the valve stem coupling body is provided outside the casing.
[0011]
An opening degree detecting means is attached outside the basic unit, and an automatic driving force generating means is controlled by a valve opening / closing position signal output from the opening degree detecting means to open / close the valve. To do.
[0012]
The basic unit and the additional unit are connected with a spring pin on one side, and fixed with a retaining plate and a screw on the opposite side, so that the basic unit and the additional unit are detachably connected.
[0013]
Effect of the Invention [0014]
In order to switch between manual and automatic, it is generally necessary to replace the drive. In that case, the valve must be fully closed and fully opened each time it is replaced. On the other hand, in the present invention, since the manual drive unit is left as it is and the automatic drive unit is added thereto, there is no change in the seal point set in the manual drive unit. It has the effect that there is no need for a leak inspection.
[0015]
Thus, for example, when changing from a manual device to an automatic device in the past, it is necessary to purchase an automatic device, remove an old device, and install a new device. However, according to the present invention, the attachment of the additional unit, which is an automatic drive mechanism, has the effect that the manual device can be converted into an automatic device at a much lower cost of introduction. is there. The attachment of the additional unit to the basic unit has the effect that it is unnecessary to adjust the fully closed position or the fully open position, which has been troublesome in the past because there is no need to change the internal configuration. Further, when manual operation becomes necessary from the automated state, it is possible to easily remove only the additional unit, no adjustment after removal is required, and the switching work can be greatly reduced.
[0016]
Furthermore, the valve opening degree is detected by the valve opening degree detection mechanism, and the automatic drive mechanism is controlled by the signal that has detected the opening degree so that the valve is opened and closed. The valve can be opened and closed remotely.
BEST MODE FOR CARRYING OUT THE INVENTION
[0017]
Preferred embodiments of the present invention will be described in detail below. 1-4, (1) is a basic unit, (2) is an additional unit that is added to the basic unit as necessary, and can be manually added by adding an additional unit to the basic unit. The drive mechanism can be changed to an automatic drive mechanism. The basic unit (1) is rotatably supported in the casing (3), one end of the basic unit (1) extends outside the casing (3), and the outside from the outside in conjunction with the driving shaft (4). Is provided with a driving force transmission mechanism (5) for transmitting the driving force to the valve stem connector (6). An operation handle (7) for applying power by manual operation is detachably attached to the tip of the drive shaft (4) extending outward from the casing (3). The drive shaft (4) is provided with a keyhole (8) outside the casing (3), and a gear (9) for transmitting power from the additional unit (2) to the drive shaft (6) is provided as a key ( 10), when the automatic mechanism is unnecessary, the key (10) and the gear (9) can be disconnected and the automatic mechanism can be easily removed. .
[0018]
The driving force transmission mechanism (5) includes a traveler nut (12) screwed into the screw (11) of the drive shaft (4) and movable in the axial direction of the drive shaft, and a link arm connected to the traveler nut (12). (13), the link arm (13) is connected to the valve stem connector (6), and when the traveler nut (12) moves along the axis by the rotation of the drive shaft (4), The valve stem coupling body (6) is rotated via the link arm (13). The valve stem is connected to the valve stem coupling body (6) in the direction of rotation, and the valve is opened and closed by the rotation of the valve stem.
[0019]
The driving force transmission mechanism (5) disposed in the casing (3) uses the driving force applied to the driving shaft (4) by an external manual driving force as the valve rod coupling body (in the casing (3)). It is only necessary to be able to transmit to 6) and is not limited to the traveler nut and the link arm, and a desired driving force transmission mechanism can be adopted. For example, a worm gear mechanism that changes the rotation direction of the drive shaft (4) and transmits it to the valve stem coupling body (6) by a worm fixed to a predetermined portion of the drive shaft (4) and a worm wheel meshing with the worm is adopted. You may do it. In addition, a screw nut is screwed onto a screw of the drive shaft (6), and a squat choke is interlocked with the traveler nut to transmit the rotational power of the drive shaft (4) to the valve stem coupling body (6). May be adopted.
[0020]
A valve closing side restricting body (14) and a valve opening side restricting body (15) for restricting the rotation angle are fixed to the valve stem coupling body (6), and the protruding length from the outside of the casing (3) is fixed. Opening and closing of the valve is restricted by contacting either the adjustable closing stopper (16) or the valve opening stopper (17) formed in the casing (3). In FIG. 2, a solid line represents a closed state, and a two-dot chain line represents a valve open state. The opening degree of the valve is displayed by an opening degree display device (18) disposed on the outer surface of the casing (3) so that the opening degree of the valve can be visually recognized from the outside of the casing (3). I can do it. This opening degree display device may be an opening degree detecting means as described later, and may output an electrical or pneumatic opening degree signal. The valve stem coupling body (6) includes a cylindrical body (19) rotatably mounted on the casing (3) substantially perpendicularly to the drive shaft (4). A connection hole (20) is formed, and the tip of the valve stem is engaged to connect the valve stem to the cylindrical body integrally in the rotational direction. Here, although the connecting hole (20) in the figure is a square hole, it is needless to say that the present invention is not limited to this.
[0021]
The additional unit (2) includes the gear (9) incorporated in a substantially L-shaped rectangular box-shaped motor housing (21), and an electric motor for applying a driving force to the gear (9). 22) and a reduction transmission mechanism (23) for transmitting the rotation of the electric motor (22) to the gear (9) while reducing the rotation. The deceleration transmission mechanism (23) is composed of a combination of a plurality of gears as conventionally known, and transmits the rotation of the electric motor (22) while decelerating. The motor housing (21) has a motor housing portion (24) and a gear housing portion (25) formed so as to protrude in an L shape from the motor housing portion (24), and has a generally L-shaped box shape as a whole. Is formed.
[0022]
A spring pin mounting hole (26) is formed at a predetermined location on the outer surface of the gear housing (25), and the spring is inserted into the spring pin fitting hole (27) of the casing (3) of the basic unit (1). The basic unit (1) and the additional unit (2) can be detachably connected by inserting a pin (28). In order to fix the additional unit to the basic unit, the additional unit (2) is fixed to the retaining plate (29) fixed to the basic unit (1) with a screw (30) on the side opposite to the spring pin (28).
[0023]
In the illustrated embodiment, the driving force generating means incorporated in the additional unit (2) employs the electric motor (22), but another form of driving force generating means such as air driving may be used. Accordingly, it goes without saying that the drive force transmission mechanism from the drive force generating means to the drive shaft (6) of the basic unit (1) may have another configuration.
[0024]
5 to 10 show a modification of the present invention. Instead of the opening degree display device (18) shown in FIGS. 1 and 2, the opening degree detection device (31) is replaced with a casing of the basic unit (1) ( 3) is attached to the outer surface, detects the rotation angle of the valve stem coupling body, that is, the valve stem, outputs a valve opening signal, and operates the driving force generating means of the additional unit according to the output opening signal. Is controlled. The opening degree detection device (31) may output an electrical signal, a pneumatic signal, or other desired signal, and is not particularly limited. The valve opening degree detection device detects the valve opening degree, controls the automatic drive mechanism based on the opening degree signal, and opens and closes the valve to remotely display and check the opening / closing state of the valve or perform the valve opening / closing operation. I can do it.
[0025]
Referring to FIGS. 5 to 10, the opening degree detection device (31) includes a substantially rectangular box-shaped casing (32), and an output shaft (33) extending in the longitudinal direction is rotatable in the casing (32). Is pivotally supported. The output shaft (33) is coupled to the valve rod coupling body (6) in the direction of rotation. Two limit cams (34) on the closing side and the valve opening side are fixed to the output shaft (33), and the limit switch (35) on the closing side and the valve opening side operated by the cams is connected to the casing (32 ), The limit cam (34) operates the limit switch (35) by the rotation of the output shaft (33) that rotates integrally with the valve stem, and outputs a signal to open or close the valve. . The output signal is displayed on an opening degree display panel grounded at a remote place, and the opening degree of the valve can be confirmed at the remote place. Furthermore, it is possible to remotely operate the valve by operating the valve operation panel to control the operation of the automatic driving force generating mechanism.
[0026]
An indicator (36) is attached to the outer end of the output shaft (33) extending to the outside of the casing (32) so that the valve opening degree can be visually confirmed from a position close to the valve device. As shown in FIG. 9, the casing (32) is fixed with a connection pin (37) such as a spring pin and a screw (39) inserted between the casing (3) of the basic unit (1). The connecting plate (38) is connected to the casing (3).
[Brief description of the drawings]
[0027]
1 is an external view of the basic unit and the additional unit connected. FIG. 2 is a cross-sectional view of the basic unit and the additional unit connected. FIG. 3 is an external perspective view of the basic unit. FIG. 5 is a plan view showing one modification. FIG. 6 is a side view of the modification. FIG. 7 is an exterior perspective view of the modification. FIG. 8 is an exploded perspective view of the modification. FIG. 10 is a cross-sectional view of a part of the opening detection device. FIG. 10 is a cross-sectional view of the opening detection device in the direction different from FIG.
[0028]
DESCRIPTION OF SYMBOLS 1 Basic unit 2 Additional unit 3 Casing 4 Drive shaft 5 Drive force transmission mechanism 6 Valve rod coupling body 7 Handle 8 Keyhole 9 Gear
10 key
11 Screw
12 Traveler nut
13 Link arm
14 Valve closing side regulator
15 Valve opening side regulator
16 Stopper side stopper
17 Valve opening side stopper
18 Opening indicator
19 Cylindrical body
20 Connecting hole
21 Motor housing
22 Electric motor
23 Deceleration transmission mechanism
24 Motor housing
25 Gearbox
26 Spring pin mounting hole
27 Spring pin fitting hole
28 Spring pin
29 Retaining plate
30 screws
31 Opening detection device
32 casing
33 Output shaft
34 Limit cam
35 Limit switch
36 Indicator
37 Connection pin
38 Connecting plate
39 Screw

Claims (4)

A basic unit including a drive shaft rotatably supported in the casing, one end extending out of the casing, and a drive force transmission mechanism that transmits an external drive force to the valve rod coupling body in conjunction with the drive shaft; Including an automatic additional driving force generating means in the housing and an independent additional unit having a deceleration transmission mechanism for transmitting the driving force, and manually operating the tip of the driving shaft extending outward from the casing of the basic unit. A handle is detachably attached, a keyhole is provided on the drive shaft outside the casing, and a gear connected to the deceleration transmission mechanism of the independent additional unit is freely connectable to the drive shaft by a key engaged with the keyhole. The independent additional unit is detachably coupled to the basic unit, and the driving force of the automatic driving force generating means is transmitted to the driving shaft via the power transmission mechanism and the gear. The manual drive type valve with the handle can be opened and closed as an automatic drive type valve at any time during inventory after production and at any time during pipe installation without changing the manual valve drive mechanism. The automatic driving force generating means is composed of electric driving means, and is incorporated in a substantially L-shaped box-shaped housing together with power transmission means for transmitting the driving force to the driving shaft to constitute an independent additional unit. The valve drive device characterized by the above-mentioned. 2. The valve driving device according to claim 1, wherein an opening degree display device capable of visually recognizing the opening degree of the valve in conjunction with the rotation angle of the valve stem coupling body is provided outside the casing. An opening degree detecting means is attached outside the basic unit, and an automatic driving force generating means is controlled by a valve opening / closing position signal output from the opening degree detecting means to open / close the valve. The valve drive device according to claim 1 or 2. The basic unit and the additional unit are connected to each other by a spring pin and fixed to each other by a retaining plate and a screw so that the basic unit and the additional unit are separably connected. 4. The valve drive device according to any one of 3.

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