JPS5838198Y2 - Butterfly valve opening/closing device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a butterfly valve opening/closing device.

A butterfly valve adjusts the flow rate by changing the opening degree of its valve plate. Conventionally, a lever fixed to the valve shaft is connected to a cylinder device to open and close the valve plate and support it at a constant opening degree. There is something I did.

For example, Japanese Patent Application Laid-Open No. 50-119324 discloses a power device for a control valve as shown in FIG.

That is, both ends of a chevron-shaped crank member 1040 whose apex is fixed to the valve shaft 101 are connected to piston rods 111° and 111' of a pair of cylinder devices 110 and 110' which are swingably supported at one end, respectively, to provide water pressure supply means. One side 121 of a pair of water pressure control pipes led out from 120 and applying water pressure in mutually opposite directions is connected to a pair of cylinder devices 110゜11.
One end of the piston rod 121' is connected to one end of the piston rod 121' at opposite positions, and the other end 121' is connected to the other end of the piston rod 121' at opposite positions of the piston rod 121'.
1.111' are expanded and contracted in opposite directions, and the valve stem 101
The valve plate is rotated to open and close the valve plate, and is also supported at a constant opening degree.

Reference numeral 122 in the figure is a reduction valve installed in one of the water pressure control pipes 121', and is operatively combined with a rotary cam 123 provided at the upper extension end of the valve shaft 101.

However, in this structure, fluctuations in the load applied to the valve plate are applied to the cylinder device via the valve shaft, lever or crank member, and piston rod, resulting in air or oil leaks from the pressurizing side to the pressurized side. The piston rod sometimes expands and contracts to -Till, making it difficult to maintain the valve plate at a desired opening degree for a long period of time.

The present invention solves the above-mentioned drawbacks of the conventional example by combining a cylinder device that rotates the valve shaft and a stopper device that prevents the load applied to the valve plate from acting on the cylinder device. The present invention aims to provide a butterfly valve opening/closing device that can be supported at a constant opening degree.

The butterfly valve opening/closing device of the present invention has a rod that is capable of reciprocating linear movement in conjunction with a cylinder and is connected to a lever fixed to the valve shaft via a connecting rod, and the rod has a number of grooves in the cross direction. At the same time, a stopper device that presses and engages with the groove is provided on the side of the rod so that the pressing force on the groove can be adjusted, and the pressing force of the stopper device on the rod can be adjusted appropriately. This prevents the load applied to the valve plate from acting on the rod through the lever and connecting rod integrated with the valve shaft and causing the rod to move, by means of a stopper device that presses and engages with the groove of the rod. This prevents the load on the valve plate from being applied to the cylinder device, causing air leaks or oil leaks from the cylinder device, and causing the rod to move unexpectedly and changing the opening degree of the valve plate. The opening position of the valve plate can be easily changed by maintaining a constant opening and, if necessary, extending and retracting the cylinder device against the pressing force of the stopper device.

Embodiments of the present invention will be described below based on diagrams.

As shown in the diagram, 1 is the valve stem, 2 is the valve plate provided on the valve stem 1,
3 is a valve box, 4tf'M-a lever fixed to the = end of shaft 1,
5 is a connecting rod that is pivotally connected to the lever 4 with a pin 6; 7 is a rod that is integrally connected to the piston rod 11 of the cylinder 10 and is capable of reciprocating linear movement; the connecting rod 5 is pivotally connected to the tip of the rod with a pin 8. ing.

Further, on the upper surface of the rod 7, a large number of grooves 9 in the shape of peaks and valleys corresponding to the opening degree of the valve plate 2 are cut in the transverse direction.

12 extends from the cylinder 10 in parallel to the rod 7,
This is a bracket whose tip is fixed to the valve box 3.

13 is the rod 7 facing the groove 9 carved in the rod 7.
This is a stopper device provided at a position beside the bracket 12, and is supported by a stopper support plate 14 fixed to the bracket 12.

The reciprocating linear motion of the rod 7 is converted into an arcuate motion of the lever 40 about the valve stem 1, and at this time the rod 7 and the lever 4 are connected to the connecting rod 5 by the shaft pin 8. '6, the rod 7 does not touch left and right, and the stopper device 13
The positional relationship is kept constant.

FIG. 3 shows a detailed diagram of the stopper + device, in which 15 is a spring housing fixed to the top of the stopper support plate 14, 16 is a coil spring installed in the spring housing 15, and 17 is an adjustment provided on the top of the spring housing 15. The screw receiver presses the spring 16 through the plate 18, making it possible to adjust the spring pressure.

Reference numeral 19 denotes a knob fitted to the lower part of the spring housing 15, which is pressed by the spring 16 and bites into the groove 9 of the rod 7, thereby fixing the movement of the piston rod 11 of the cylinder 10 at an arbitrary position. , the valve plate can be set to a desired opening degree.

In other words, to maintain the opening of the valve plate 2, tighten the adjustment screw 17.
This is done by engaging and tangentially the knob 19 with the groove 9 of the rod 7 to maintain the position of the rod 7. At this time, the tightening force of the adjusting screw 17 is such that the fluid flowing through the valve body 3 It is necessary that the component of the load force acting on the plate 2 in the direction of pushing up the knob be larger.

When changing the opening position of the valve plate 2, a force larger than the rod direction component of the pressing force is applied to the rod 7 via the piston rod 11 using the cylinder 10, and the rod 7 is moved against the knob 19. It is done by letting

By repeating this process, it is possible to maintain the valve plate 2 at an arbitrary opening degree.

In addition, when holding for a long time, the supply of air or hydraulic pressure may be cut off.

The butterfly valve opening/closing device according to the present invention connects a rod that moves linearly reciprocally in conjunction with a cylinder to a lever fixed to a valve shaft of a valve plate via a connecting rod, and has a number of peak-and-valley shaped grooves carved into the rod. Since the stopper device that engages with the groove is provided so that the pressing force against the groove can be adjusted, the stopper device that locks the movement of the rod can be pressed with a very simple structure even under the fluctuating load of the fluid applied to the valve plate. By adjusting the pressure according to the fluid balls acting on the valve plate, operating the cylinder, and moving the rod to the desired position and locking it, the valve plate can be fully opened, fully closed, or at any desired opening. In addition, even if the cylinder is used for a long time, air or oil leakage from the cylinder can prevent the valve plate from moving in the open or closed direction. The valve plate can be held more reliably than a device with a chisel.

In addition, since the stopper device is attached to a rod that is linearly linked to a lever fixed to the valve stem via a connecting rod, the stopper device is provided with less force from the valve stem that is applied to the stopper device, compared to a case where the stopper device is installed directly on the circumferential side of the valve stem. The load is small and the equipment can be small.

Furthermore, it is cheaper and more economical than an electrically operated type, does not require special handling skills, and has the advantage of being able to be centrally controlled remotely.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a partially cutaway plan view thereof, Fig. 2 is a side view, Fig. 3 is an enlarged partially sectional side view of the main part, and Fig. 4 is a conventional example. This is the concept drawing. 2... Valve plate, 4... Lever, 5... Connecting rod, 7...
・Rod, 9... Groove, 10... Cylinder, 13.
...Stopper device, 16...Coil spring, 17...
・Adjustment screw, 19...knob.

Claims (1)

[Scope of utility model registration request] A rod capable of reciprocating linear movement in conjunction with a cylinder is connected to a lever fixed to the valve shaft via a connecting rod, and the rod is provided with a large number of grooves in the transverse direction, and a number of grooves are carved on the side of the rod. A butterfly valve opening/closing device is provided with a stopper device that presses into the groove and adjusts the pressing force against the groove.