KR101299986B1 - Advanced nonreturn valve - Google Patents

Abstract

The present invention connects the connecting surfaces of both flanges through the key and the key groove so that the two flanges connecting the actuator or damping device connected to the shaft of the check valve coupled to the shaft is not damaged by the impact of the two flanges. The shaft supporting the disc against the reverse hydraulic shear force acting on the back of the disc by securing the fastening force so that the fastening force of the flange is not weakened, the bolt is broken, or the bolt and nut are not loosened by fastening the bolt and nut to the fastening hole of the This invention relates to a check valve that greatly improves reliability by reinforcing the supporting force of the.

Description

Improved check valve {ADVANCED NONRETURN VALVE}

The present invention connects the connecting surfaces of both flanges through the key and the key groove so that the two flanges connecting the actuator or damping device connected to the shaft of the check valve coupled to the shaft is not damaged by the impact of the two flanges. Is secured by tightening the bolt with the nut to secure the fastening force of the flange that is not weakened or the bolt is broken or the bolt and the nut are not relaxed, and the shaft's supporting force against the reverse hydraulic shear force acting on the back of the disc is enhanced. A greatly improved improved check valve.

In general, when the fluid is transferred to a specific region in a pump station provided in a hydro power plant, a dam or a reservoir or a water purification plant, the fluid pumped in a large amount by the transfer pump is transferred along the transfer pipe.

The pumping station is basically equipped with a pump and a transfer pipe, a surge tank check valve, a flow control valve, a maintenance shut-off valve and a safety valve for safe fluid pumping, but the transfer pump suddenly stops due to power failure or other unexpected reasons. Water hammer occurs in the pipe due to the pressure of the backflowing fluid, which causes a fatal impact on the pump and the pipe or other facilities.

In order to prevent such a problem, a check valve is installed in the pipeline of the transfer pipe to prevent the backflow of the fluid and to buffer the water pressure and the water shock to protect the pipe and various pumping facilities.

For example, the check valve may be referred to Korean Patent Application Publication No. 2000-0030247 (pump control high pressure butterfly valve) and Korean Utility Model No. 20-0206590 (pump control valve) created by the present inventor.

Functional features according to the conventional check valve as described above will be briefly described with reference to FIGS. 1 and 2.

1 is a cross-sectional view of main parts of a check valve viewed from a front of a disk installed in a casing of a check valve, and briefly describes the main configuration and operation of the check valve 10.

The check valve 10 is a shaft installed across the conduit 12 so that the disk 20 and the disc 20 for opening and closing the conduit 12 can be opened and closed while being rotated together with the disc. A check valve casing 10a (hereinafter referred to as 'first configuration') comprising a 30;

② The gear group 40b is built in to connect the shaft 30 extending to the side of the check valve casing 10a to transmit power to the shaft 30 to open the disk 20 installed in the conduit 12. An actuator having a gearbox 40a (hereinafter referred to as a 'second configuration');

(3) When the disk 20 is closed, that is, by providing a resistance force to the shaft 30 that rotates with the disk 20 by the reverse hydraulic pressure acting on the back surface of the disk 20 so that the disk 20 does not close temporarily. The damping device 50 (hereinafter referred to as "third configuration") that buffers the water pressure is thereby constituted.

A characteristic of the first configuration is that the fluid passes through the disk 20 while being opened about the shaft 30 by the pressure of the fluid flowing into the conduit 12 of the conveying pipe, and the fluid conveying pump (not shown in the drawing). Is stopped, due to a power failure or other unforeseen circumstances, the conduit 12 acts to close the conduit 12 so that the fluid passing through the disc does not flow back to the disc.

The second configuration is a device that transmits power to the shaft 30 to which the disk installed on the conduit 12 is coupled to open and close the disk 20, and has electric and manual functions.

As described in the first configuration, the third configuration includes a shaft 30 connected to the disk 20 such that the disk does not close instantly due to the hydraulic pressure applied to the back of the disk 20 when the disk 20 blocks the conduit. It is a damping device 50 to provide a resistance to suppress the closing operation of the disk 20 to perform the effect of buffering the hydraulic pressure.

More specific configurations according to the first to third configurations described above and the effects of the configurations can be referred to the aforementioned prior art documents.

The present invention connects the second configuration and the third configuration to the first configuration, that is, the connecting portion and the shaft 30 connecting the actuator 40 and the damping device 50 to the shaft 30 of the check valve 10. It is related to the improvement of the reliability of the check valve 10 by strengthening the rigidity against the shear force applied to.

Looking at the coupling structure of the second configuration and the first configuration employed in the conventional check valve 10, the boss 13 for rotatably supporting the shaft 30 to which the disk 20 is coupled check valve casing (10a) ) And a flange 31 is provided at the end of the boss 13.

And, the second configuration, that is, the gearbox and the gearbox for connecting the output shaft of the gearbox 40a for transmitting the power output from the actuator 40 to the shaft 30 and the shaft 30 installed inside the boss 13 Flange 41, 31 is provided at the end of boss 13, respectively, and both flanges 41 and 31 are fastened with bolts and nuts (not shown) to the actuator 10a of the check valve 10. Fit 40.

On the other hand, the third configuration, that is, the damping device 50 is designed in a structure that interlocks with the gear group 40b for transmitting the power of the actuator 40 of the second configuration to the shaft 30, the gear group is built-in When the gear box 40a is fastened to the boss 13 flange 31, the damping device 50 is also mounted on the check valve casing 10a.

However, when the drive of the transfer pump is stopped, the shear force of the fluid acting on the back surface of the disk 20 acts in the axial direction of the conduit while the disk 20 receives the force to retreat in the axial direction of the conduit. Shear stress is generated on the shaft 30 supporting the shaft 30 and the buffer pressure of the damping device 50 connected to the shaft 30 is opposed at the shaft 30 when the disk 20 rotates about the shaft 30. While the torsional stress is generated in the shaft 30.

At this time, since the pressure of the fluid applied to the disk 20 is greater than the energy provided by the damping device 50, the reverse hydraulic pressure is transmitted to the damping device 50 through the shaft 30, but the force opposed to the shaft 30 is Since the reverse hydraulic energy is stronger, the gearbox 40a flange 41 coupled to the boss 13 flange 31 tends to rotate.

However, since the flanges 41 and 31 of the gearbox 40a and the boss 13 are fastened by bolts and nuts, the flange 41 of the gearbox 40a side is not actually rotated but is relatively inverted. As the energy of hydraulic pressure is transferred to the bolts, the bolts are broken or the coupling force of the bolts and nuts is relaxed, so that both flanges 41 and 31 are often completely separated.

On the other hand, the shaft 30 to which the disk 20 is coupled, while the shear stress of the hydraulic pressure acting on the back surface of the disk 20 is concentrated at the inlet of the boss 13 side of the conduit 12 while the part is fatigued The problem of breaking the shaft 30 also often occurs.

The main cause of the shaft 30 broken is the direct cause of the excessive hydraulic pressure back to the shaft 30 and due to the opposition of the back hydraulic energy coexisting in the shaft 30 and the buffering force of the damping device 50 The fact that fatigue due to torsional stress in the shaft 30 is added to the shear force also has a significant effect.

The check valve 10 is not usually used for small diameter pipes, but is mainly used for large diameter pipes having a diameter of 1 m or more. In particular, when the fluid is transferred from a low place to a high place, the fluid transfer pump may be unpredictable. When the drive is stopped, it is installed on the pipeline of the transfer pipe to protect the pipeline, pump and other pumping equipment to block the pipeline to prevent fluid from flowing back.

Therefore, when the fluid transfer pump is stopped, the reverse hydraulic pressure applied to the rear surface of the disk 20 increases the weight of the fluid to the weight of the fluid according to the diameter of the pipe and the length and height of the pipe so that the very large hydraulic pressure is increased. While acting on the back surface of the shaft 30 supporting the disk 20 is a problem that does not overcome the hydraulic pressure is broken.

As a result, the shaft 30, which is fatigued by the shear and torsional stresses on the shaft 30 due to excessive hydraulic pressure acting on the back surface of the disk 20, is broken by hydraulic pressure or the flange joint connected to the shaft 30 is loosened or the fastening bolt Is a severe problem that the actuator 40 is coupled to the damping device 50 is completely apart.

The present invention has been invented to solve the problems as described above, an object of the present invention is to extend the end of the board supporting the shaft to the pipeline to endure the shear force received by the shaft to strengthen the bearing capacity of the shaft, The reverse hydraulic energy transmitted from the disk to the shaft and from the shaft to the damping device ensures that the two flanges connecting the disc coupled shaft and the output shafts of the actuator and the damping device are not separated and the bolts connecting the two flanges It is to provide a check valve that can significantly improve the reliability by securing a solid flange fastening so as not to break or loose the nut.

Solution to the check valve of the present invention,

A check valve casing, which is installed on a pipeline of pipes to open and close the flow of fluid, and includes a disc-attached shaft that is rotatably supported by a boss crossing the casing to open and close the pipeline;

An actuator having a gear box having a built-in gear group therein and connected to the shaft;

In the check valve flanged to the maintenance of the output shaft of the gear box connected to the output of the actuator and the damping device for buffering the reverse hydraulic pressure acting on the back of the disk,

Keys are provided on either side of the flange provided on the boss that supports the shaft rotatably, or the flange provided on the output shaft of the gearbox, and key grooves are provided on the opposite flange surface to connect both flanges by the key grooves and the keys, and then It can be realized by fastening with a bolt and a nut, and installing one end of the boss to protrude as far as possible into the pipeline, and installing a sliding bearing on the inner diameter of the boss on the pipeline side.

According to the present invention, the flange of the boss for rotatably supporting the disk coupled shaft, and the gear group for transmitting and receiving the power of the actuator and the damping device connected to the shaft in the connection of the flange of the built-in gear box The flanges are separated or broken by connecting the two flanges by the key and the key groove to the two flanges respectively, and blocking the reverse hydraulic energy transmitted to the bolt and the nut by the key and the key groove by tightening the bolt and nut so that the two flanges are not separated. There is an effect to prevent losing or loosening the nut.

In addition, the present invention has an effect that can greatly enhance the rigidity of the shaft against the shear force by extending the boss for supporting the shaft to the pipe line with respect to the shear force due to the reverse hydraulic pressure acting on the back of the disk.

Therefore, the present invention provides an effect that can greatly improve the reliability of the check valve.

1 is a main portion cross-sectional view of a conventional check valve from the back, an enlarged cross-sectional view of the main portion showing the enlarged flange portion and an enlarged sectional view of the flange showing the main portion,
Fig. 2 is an enlarged view of a main portion of a boss supporting a shaft with a disc as a main portion cross-sectional view of a conventional check valve from the back;
3 is a cross-sectional view of a main portion of the check valve according to the present invention as viewed from the rear side thereof, and an enlarged cross-sectional view of a flange showing an enlarged view of the main portion and an enlarged portion of the flange showing an enlarged flange portion;
Figure 4 is a sectional view of the main portion of the check valve according to the present invention viewed from the rear side, and is an enlarged view of the main portion of the boss for supporting the shaft with a disk.

Hereinafter, a preferred embodiment of the check valve according to the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 3, FIG. 3 is an exploded cross-sectional view of a main portion of the flange, which is an enlarged view of the flange portion and an exploded enlarged cross-sectional view of the flange portion of the check valve according to the present invention. ) To the shaft 300 to drive the flange 131 provided at the end of the boss 113 for supporting the shaft 300 and the disk opening actuator 400 connected to the shaft 300. A flange 141 is provided for mounting the gear box 400a in which the gear group 400b for transmission is mounted to the boss 113.

As shown in FIG. 3, the two flanges 131 and 141 are provided with a key 141a on one side of the flange surface, and a corresponding groove is provided with a key groove 131b into which the key 141a is inserted. When the flanges 141 and 131 are abutted with each other, respective fastening holes 131a are provided on the coaxial line.

Each fastening hole 131a is fastened such that both flanges 141 and 131 are closely contacted by fastening the bolt and the nut (not shown) as shown in FIG. 3.

Therefore, since the flanges 141 and 131 according to the present invention cannot rotate in the circumferential direction of the surge flange by the key 141a and the key groove 131b, the reverse hydraulic energy transmitted to the shaft 300 is transferred to the bolt. Not delivered. Therefore, the bolt is broken or the fastening element never relaxes.

4, FIG. 4 is a sectional view showing a main portion of the check valve 100 according to the present invention as viewed from the rear, and is an enlarged view of the main portion of the boss 113 supporting the shaft 300 to which the disk 400 is attached. By extending the end of the boss 113 supporting the shaft 300 toward the conduit 112 as much as possible, the rigidity against the shear force acting on the shaft 300 may be enhanced.

In the inner diameter of the pipe-side boss 113 is provided with a sliding bearing 132, when the shaft 300 is rotated, the position of the bearing (support point) for supporting the shaft 300 is disposed as close as possible to the action point acting the shear force As a result, even when the shaft is the same diameter as the conventional shaft, the rigidity of the shaft 300 with respect to the shear force can be greatly enhanced.

As described above, the present invention can greatly enhance the rigidity of the shear force acting on the rear surface of the disk, and the coupling part (flange) of the actuator and the damping device connected to the shaft is firmly fastened, thereby greatly improving the reliability of the check valve. It can provide an effect that can be made.

100: check valve 112: pipeline
113: boss 131: flange
131a: fastener 131b: keyway
132: sliding bearing 141: flange
141a: key 200: disk
300: shaft 400: actuator

Claims (1)

A stationary body composed of a shaft 300 installed on a conduit 112 of a conveying pipe and attached with a disk 200 rotatably supported by a boss 113 to open and close a flow of fluid flowing along the conduit 112. With a valve casing;
An actuator 400 having a gear box 400a having a gear group 400b therein and connected to the shaft 300;
A check valve flanged to the boss 113 with an output shaft of a gear box 400a connected to a damping device 500 that buffers the output of the actuator 400 and the reverse hydraulic pressure acting on the back surface of the disk 200. 100),
In connecting the gear box 400a to the boss 113 for rotatably supporting the shaft, the key 141a and the key groove 131b are formed on the surface where the flange 141 of the gear box 400a and the flange 131 of the boss contact each other. And each of the flanges 131 and 141 are fastened with bolts and nuts so that the key 141a and the key groove 131b are engaged with each other, and surrounds the circumferential surface of the shaft 300 positioned in the conduit 112. The boss 113 is extended so as to protrude into the conduit 112 so as to be stacked, and an inner diameter of the boss 113 is provided with a sliding bearing 132 for rotatably supporting the shaft. Check valve.

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