KR100419187B1 - Automatic control check valve - Google Patents

Abstract

The present invention relates to an automatic control check valve, and the control check valve is manually or electrically controlled to more reliably shut off, prevent backflow, adjust the flow rate, and bypass the hydraulic cylinder. It is a multifunctional valve that prevents slam surge and water shock, and has several functions in one operation. It reduces the cost of piping and equipment, minimizes the building area, and is economical and easy to maintain. The purpose is to provide a control check valve.

The automatic control check valve of the present invention for achieving this purpose, the manual wheel 34 to allow the disk 12 to be forced to close or adjust the opening degree by manually or automatically rotating the valve shaft 14 during the flow rate control; And / or an electric drive device 36 is included, and the manual wheel 34 and / or the electric drive device 36 are connected with a rotating shaft 30 which is rotated according to the operation thereof. ), A worm gear 32 is formed, and the worm gear 32 is rotated in engagement with the shaft segment 22 provided on the valve shaft 14 to forcibly press the disk 12 compressed by the valve shaft 15. It is characterized in that it is configured to close or adjust the opening.

Description

Automatic Control Check Valve {AUTOMATIC CONTROL CHECK VALVE}

The present invention relates to an automatic control check valve, and more particularly, to a multifunctional valve having a shutoff, a reverse flow prevention, a flow control and a bypass function, in which the disc is forcibly closed by manual or electric power during flow control and the opening degree is adjusted. It is an automatic control check valve that is easy, completely shut off and multi-stage closed, free of slam and flap hammer, and prevents water shock.

In general, industrial and water supply and drainage pipes, such as the check valve is installed in the outlet and the pipeline of the pump, such a check valve when the motor suddenly loses the driving force due to a momentary power interruption or tripping of the motor during operation of the pump, The flow velocity in the pipeline changes drastically to prevent the flow of backwater.

Such a check valve is also responsible for preventing the flow of the downstream flow back to the upstream end when the flow of water flows from the upstream end of the conduit to the downstream end is reduced and the water pressure is lowered.

However, such a check valve has a rapid change in the flow velocity in the conduit according to the closing time and the pressure is also greatly increased or lowered, causing a water hammer due to the fluid transient phenomenon.

Here, when the pressure wave reciprocates between the upstream end and the downstream end due to a sudden flow rate change in the pipeline, the pressure in the pipeline falls below the saturated vapor pressure of water according to the pipeline shape, resulting in steam separation.

At this time, if the pressure in the pipeline is lower than atmospheric pressure, the buckling may occur in the pipeline, and when the water column separated by the steam cavity recombines, a high pressure is induced and the pipeline is broken.

In this way, the damage caused by the water hammer caused by the failure of the check valve closing time to be properly adjusted is as follows.

First, when the power of the pump is suddenly shut off, the closing time of the check valve is delayed, so the pump motor is reversed due to excessive backflow of the water flow rate, the nut of the pump shaft sleeve is loosened, the bearing and the shaft sleeve are broken, and the reverse rotation is Acceleration occurs when the motor changes like a generator, and if the check valve is rapidly closed when the backflow increases, a flap hammer causes a slam. The pipelines and other facilities may be damaged.

In addition, as the pressure in the pipeline increases and decreases periodically, the pipeline collapses or water column separation occurs, causing the pipeline to rupture. In addition, since periodic pressure fluctuations in the pipeline occur suddenly, it is difficult to accurately control the pressure in the electric control system, damage the measuring instrument, and damage the structure adjacent to the pipeline.

These conventional check valves are mainly installed on the pump discharge side and fail to properly control the closing time, causing various accidents due to the water hammer action, and only the reverse flow prevention and exponential action.

Thus, the pump outlet has a check valve, a flow control valve, a shut-off valve, including a check valve, a flow control valve, a shutoff valve, so that the installation cost increases and the maintenance cost is excessively consumed.

Accordingly, in order to solve the above problems, the present applicant is equipped with hydraulic cylinders on both sides of the valve shaft to open the valve disc by hydraulic pressure or to close in two or multiple stages, thereby damaging the valve and the pump due to water shock. Proposed and prevented a control check valve (Patent Application No. 10-2000-64367).

The control check valve is to open or close the valve by the hydraulic pressure, and to close in two or multiple stages in case of emergency closing, the arm is fixed to one side of the valve, and the arm is interlocked with the segment gear to link the hydraulic cylinder It is installed so that the valve disc can be opened or closed by the hydraulic pressure of the hydraulic cylinder.

On the other hand, by installing an auxiliary hydraulic cylinder on the other side of the hydraulic cylinder, the pump loses power due to a pump trip or power failure, and the water supply flow rate decreases, causing a slam surge when the valve closes rapidly, thereby adjusting the closing time to play a damping role. To prevent damage to the valve and pump.

The present invention has the control check valve as described above by manual or electric control to more reliably block, backflow prevention, flow control and bypass functions and the hydraulic cylinder has a function of adjusting the damping function, that is, closing time when the valve is blocked. Its purpose is to provide an automatic control check valve, and to measure the opening of the disc, as well as to control the operation of the pump and the disc in accordance with the opening degree of the disc. It is a further object to provide an automatic control valve equipped with an open finger that can remotely control the operation of the disc.

Operation conditions of the automatic control check valve of the present invention to achieve the above object should be capable of manual, automatic, on-site and remote control, and the control reception and control method should be interconnected with the pump motor. And the closing method is divided into normal closing and emergency closing, and the normal closing of the valve should be interlocked with the pump by the control panel when the pump is operating normally. The control reception and control method should be linked to the pump control and measurement installation, and when the pump is stopped, the contact bar of the position indicator should operate the pump trip position limit switch according to the opening position of the control check valve to stop the pump through the control circuit. do. In addition, the emergency shutoff should be an emergency closing operation when the pump motor stops suddenly due to a power failure or electrical problem.

In addition, a valve having a bypass function for controlling flow control, backflow prevention, blocking, and backflow allowance should include a hydraulically ideal structure and function.

The opening of the automatic control check valve should open freely as it operates as a normal check valve when each pump starts, even under excessive flow of the pump or under abnormal pressure in the pump line.

The pressure difference between the pump outlet and the main pipe before and after the valve, i.e. both sides of the valve disc, must be opened within at least 5m and designed to open itself under such pressure even after a long time in the closed position.

Once it is started, it should open itself completely to minimize head loss and be able to control the flow rate by freely adjusting the valve opening.

In addition, the normal closing under normal operation is to close the valve slowly by the electric drive or the hydraulic drive to prevent water hammer, and when the valve almost reaches the closing position, that is, the opening degree at the point where 98% is closed, The pump must be stopped via the control circuit by operating the pump trip position limit switch by means of the contact bar of the position indicator.

The closing time is within 30 seconds and should be presented as appropriate for the pump performance. The pressure difference due to the pump and the pressure difference in the closed position should be determined by the pump manufacturer and taken into account in the valve design.

In addition, when the valve is closed last time, no slam phenomenon should occur and it should close quietly without any impact.

In addition, after the valve is closed, it should be ready for the next start and the disc should only be opened freely by hydraulic force when the pump is restarted.

On the other hand, in case of emergency shutdown in case of power failure or emergency, when the power failure of the pump station or the rotation of the motor stops abruptly, or when the pump control device is defective, the valve closes itself, The valve should reach a nearly closed position (approximately 10%), the closing movement of the valve should be rapid, depending on the flow conditions, and the closing time should be nearly immediate and adjustable according to the change in flow conditions after a power failure or emergency stop of the motor.

The remaining closing time from about 10% to 0% is about 15 to 20 seconds and should be field adjustable.

In addition, when the valve is closed, by applying a two-stage or multi-stage closing method, it should be possible to suppress the water pressure rise pressure as possible, and to be able to close smoothly without the impact of backflow.

On the other hand, in the closing method, when the valve is closed, the hydraulic oil of the hydraulic cylinder is easily discharged through the valve having a relatively large diameter from 10% to 100% with the disc open, but after 10%, it is passed from the damping part of the hydraulic cylinder to the flow control valve. As it passes slowly, the valve disc can also be reduced due to the two-stage or multi-stage closing movement, and when the water hammer phenomenon is different from the design standard, the water hammer phenomenon is controlled by adjusting the damping operation time by adjusting the flow control valve. To reduce upsurge.

In addition, in order to precisely meet the opening and closing requirements of the system, a special energy converter, air-hydro converter, should be installed to ensure stable speed control and accurate closing position.

Then, a mechanical opening clock indicating the opening degree of the valve and an opening / closing instruction by a limit switch or an electrical opening clock (4 to 20 mA) should be provided.

The automatic control check valve of the present invention for achieving such a condition is characterized in that it comprises a manual wheel and / or an electric drive to enable the valve shaft to be manually or automatically rotated forcibly closing the disk or to adjust the opening amount. do.

In addition, the manual wheel and / or the electric drive is connected to the rotary shaft to be rotated in accordance with the operation, the rotary shaft is formed with a worm, the worm is rotated in engagement with the shaft segment installed on the valve shaft to the valve shaft It is characterized in that it is configured to forcibly close or adjust the opening of the condensed disk.

An auxiliary hydraulic cylinder interlocked with the electric drive device is installed, and a counter weight is installed on the other side of the auxiliary hydraulic cylinder, and in the case of a large automatic control check valve, an additional hydraulic cylinder is installed on the counter weight. By adjusting the closing speed of, it is characterized by preventing water shock.

In addition, an opening indicator for indicating the opening degree of the disk is provided on one side of the valve shaft.

In addition, the open-circuit clock is an open indicator and indicator that is fixedly connected to one end of the valve shaft, the indicator is formed with a scale that the indicator indicates, the first contact rod and the second contact rod protruding formed of the open indicator; And a pump trip position limit switch and a fully closed position limit switch installed at positions close to the first contact rod and the second contact rod, and a position transmission open position clock that is driven by a resistance value by being engaged with the opening indication plate. It features.

In addition, when a resistance value of 4 mA is transmitted to the position transmission opening indicator, the indicator matches the 0% position of the indicator, and when the resistance value of 20 mA is transmitted, the indicator matches the 100% position of the indicator. It is done.

1 is a front view of an automatic control check valve according to the present invention.

2 is an enlarged side cross-sectional view of portion A of FIG.

Figures 3a to 3d is an operating state diagram showing the opening of the disk as the operation of the worm gear and segment gear of the rotary shaft and the rack gear of the auxiliary hydraulic cylinder in FIG.

Figure 4 is a front view showing the open position clock of the automatic control check valve according to the present invention.

<Description of the symbols for the main parts of the drawings>

10 valve body 12 disc

14 valve shaft 20 segment gear

22: axis segment 23: worm gear

24: disk segment 26: rack gear

30: rotation axis 32: worm

34: manual wheel 36: electric drive

50: hydraulic piping 52: air hydro converter

54: flow control valve 56: check valve

58: flow path groove 60: flow control valve

70: genealogy indicator 72: genealogy indication plate

74: indicator 76: indicator

78,82: gear part 80: electric open door clock for position transmission

84,86: Contact rod 88: Pump trip position limit switch

90: fully closed position limit switch

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

1 is a front view of the automatic control check valve according to the present invention, Figure 2 is an enlarged side view of the portion A of FIG.

As shown in FIG. 2, one side of the valve shaft 14 in which the disk 12 is constricted with respect to the valve body 10, that is, the outer circumferential surface of the valve shaft 14 provided with the auxiliary hydraulic cylinder 18, is shown in FIG. 2. The shaft segment 22 and the disk segment 24 are installed. First, the shaft segment 22 has a worm gear 23 formed thereon so as to be idle in the valve shaft 14, and a worm formed in the rotating shaft 30. Mesh with (32). The shaft segment 22 is rotated by the worm 32 of the rotation shaft 30, and rotates according to the rotation of the rotation shaft 30 without being affected by the rotation of the valve shaft 14 to rotate the disk segment 24. To control the function.

The disk segment 24 is integrally installed with the valve shaft 14 to rotate together with the valve shaft 14, and a gear 28 is formed to form a rack formed at an end portion of the piston 25 of the auxiliary hydraulic cylinder 18. It meshes with the gear 26 and interlocks with the auxiliary hydraulic cylinder 18.

On the other hand, the upper side of the rotating shaft 30 is provided with a manual wheel 34 that is directly operated by the user and an electric drive device 36 that is operated by an electrical signal. Thus, the manual wheel 34 or the electric drive is provided. Rotating the rotary shaft 30 by operating the device 36 causes the worm 32 formed on the rotary shaft 30 to rotate, thereby interlocking the shaft segment 22.

That is, when the pump (not shown) is operated to open the disk 12 by water pressure, the disk shaft 24 is rotated while the valve shaft 14 coupled with the disk 12 rotates. However, when the shaft segment 22 is rotated to the right, as shown in FIG. 3A, and comes into close contact with the disk segment 24, the disk segment 24 and the valve shaft 14 are rotated. And the disk 12 is not opened as well, since the worm gear 23 cannot mechanically drive the worm 32. Thus, the locking position is released, i.e. the disk segment ( To release 24, as shown in FIGS. 3B and 3C, the rotary shaft 30 is rotated by operating the manual wheel 34 or the electric drive 36 before operating the pump, and thus the shaft segment 22 ) Rotates in the opposite direction Therefore, the rotational space of the disk segment 22 must be secured. Therefore, when the disk 12 is opened by the hydraulic pressure of the water flow rate, the disk segment 24 is simultaneously linked by the rotation of the valve shaft 14, and the auxiliary hydraulic cylinder The disk segment 24 is also interlocked by (18).

Although not shown, this allows the lever segment to be simultaneously released by the hydraulic oil of the hydraulic cylinder in the control check valve previously filed by the present applicant.

On the other hand, when a back flow occurs due to a momentary power interruption or the like, and the disk 12 is rapidly closed, the hydraulic cylinder 16 and the auxiliary hydraulic cylinder 18 are simply responsible for the damping function, that is, the function of adjusting the closing time. The user can operate the manual wheel 34 or the electric drive 36 to adjust the closing speed of the disc 12.

In this case, the hydraulic cylinder 16 can be adopted only the auxiliary hydraulic cylinder 18 by removing the control check valve is small, and in the case of a large size it is installed in conjunction with the counterweight 13 to perform the above operation. It is desirable to have.

Therefore, due to the two-stage or multi-stage closure of the disk 12, the slam and the flap hammer are eliminated, so the up surge is reduced, so that water shock is prevented, and damage to the valve and the pump is prevented.

3a to 3d show the opening of the disk 12 as the worm 32 of the rotary shaft 30 and the segment gear 20 and the rack gear 25 of the auxiliary hydraulic cylinder 18 are actuated. 3a is a view showing that the disk 12 is normally forced closed, Figure 3b is a view showing that the disk 12 is freely open or forced open by the fluid force, Figure 3c is a disk 12 when the flow of water flow stops FIG. 3D is a view showing the hydraulic closing by self weight, and FIG. 3D is a view showing the flow rate of the disk 12 by adjusting the opening degree.

In addition, when the user adjusts the flow rate, it is possible to operate the manual wheel 34 or the electric drive 36 to adjust the opening degree of the disk 12.

Thus, as shown in the drawing, the opening of the water flow rate can be adjusted by setting the position of the segment gear 30 to a desired position by the manipulation of the manual wheel 34 or the electric drive device 36.

Meanwhile, as illustrated in FIGS. 3A to 3D, the hydraulic pipe 50 connected to the upper and lower sides of the auxiliary hydraulic cylinder 18 is connected to the air hydro-converter 52, and on the hydraulic pipe 50. The control valve 54 and the check valve 56 are installed to control the flow rate, respectively. When the disk 12 is closed from 100% to 10% with the hydraulic pipe 50, the hydraulic pressure is discharged relatively easily. After 10%, it is gradually discharged through the flow path groove 58 formed between the upper pipe and the cylinder.

One side of the flow path groove 58 is provided with a flow control valve (needle valve) 60 is possible to adjust the flow rate.

On the other hand, Figure 4 is a front view of the open stop according to the present invention, this open stop 70 is to be fixed to one end of the valve shaft 14, as shown in Figure 1, the hydraulic cylinder 16 side It can also be installed in the auxiliary hydraulic cylinder 18 side.

The open position clock 70 is fixed to one end side of the valve shaft 14 in contact with the disk 12 as described above, and moves in accordance with the opening degree of the disk 12. 74 and an open signboard 72 to which the indicator 74 is fixedly coupled, and an indicator 76 indicating a scale is provided on the upper side of the open signboard 72.

In addition, one side of the opening indicator 72 is provided with a position opening electric opening indicator 80, the position transmission electric opening indicator 80 and the opening indication plate 72 is geared to the outer periphery, respectively. The portions 78 and 82 are formed to be interlocked as the gear bites.

The electric position indicator 80 for position transmission transmits a resistance by an electrical signal and is rotated by the resistance value. When the resistance value is 4 mA, the end of the indicator 74 is 0% of the indicator 76. To 20% and 100% position at 20mA.

On the other hand, contact rods (84,86) are formed on both sides of the lower side of the opening plate 72, respectively, and the pump trip position limit switch (88) and the position close to the contact bars (84,86), respectively. The fully closed position limit switch 90 is provided.

Therefore, when the disk 12 is closed, the first contact rod 84 is connected to the contact point of the pump trip position limit switch 88 in the closed position of approximately 98% to stop the operation of the pump, thereby Will be blocked.

In the position where the disk 12 is 100% closed, the second contact rod 86 is connected to the contact of the fully closed position limit switch 86 so that the disk is completely closed in the field central control room. .

As described above, according to the automatic control check valve of the present invention, the opening of the control check valve can be adjusted manually or automatically, and the pump discharge amount due to the pump trip or power failure is reduced so that the valve closes rapidly. Therefore, by controlling the closing speed in two stages or multiple stages, water hammer can be prevented by preventing flap hammer and slam surge due to rapid closing, and there is a certain blocking, backflow prevention, and bypass effect. The opening of the disk can be checked, and the operation and the remote control of the pump and the disk can be easily used. In addition, it is easy to manufacture and greatly reduce the manufacturing cost by forming the position indicator and position indicator, meter switch, limit switch, indicator and the like to be integrated in the open dog clock.

Although the invention has been described in detail only with respect to the specific examples described, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (5)

A valve shaft 14 having a shaft segment 22 having a segment gear 20 formed therein and a disk segment 24 having a toothed portion 28 formed therein, and a segment gear being in contact with the disk 12 of the valve body 10. A worm gear 32 meshed with the 20 is formed and is interlocked with the rotary shaft 30 connected to the manual wheel 34 and / or the electric drive device 36, the electric drive device 36, and the counterweight 13. In the automatic control check valve composed of an auxiliary hydraulic cylinder (18) to have, and an opening indicator (70) for indicating the opening degree of the disc (12) on one side of the valve shaft (14), The open position indicator 70 is a dog indicator 72 and the indicator 74 and the indicator 74 is formed with a scale that is indicated by the indicator 74 is fixed and connected to one end of the valve shaft 14, dog Pump trip position limit switch provided at a position close to the first contact rod 84 and the second contact rod 86 protruding from the display board 72, and the first contact rod 84 and the second contact rod 86. And a totally closed position limit switch (90), and an open position indicator (80) for position transmission which is geared with the opening indication plate (72) and rotated by a resistance value. delete delete delete The method according to claim 1, wherein when the resistance value of 4 mA is transmitted to the position opening dog watch 80, the indicator 74 matches the 0% position of the indicator 76 and the resistance value of 20 mA is transmitted. Automatic indicator check valve, characterized in that the indicator (74) is matched to the position 100% of the indicator (76).