KR20020083099A - Valve Opening Shutting Switch - Google Patents

Abstract

PURPOSE: To provide an air motor drive type valve switch, having a small-size clutch mechanism and an air control circuit which surely opens from a valve fully closed state in an opening operation of the valve. CONSTITUTION: This valve switch incorporates a high-speed/low-speed changeover clutch mechanism 84 in a reduction gear and is provided with the air control circuit, with subsequently a low-speed and high torque acting from the fully closed state till starting the opening in an opening operation of the valve, then a high speed and normal torque acting, and a high-speed and normal torque acting in the closing operation of the valve.

Description

Valve Opening Shutting Switch

The present invention relates to a valve opener driven by an air motor. More specifically, the present invention relates to a valve switch for opening and closing a valve for blocking, passing, and adjusting a flow rate of a fluid in a pipe or the like with an air motor through a reduction gear.

The opening and closing of the valve for blocking, passing, and adjusting the flow rate of the fluid in the pipe and the like are performed by an input, an electric motor, or the like.

However, in petroleum and chemical plants, many valve openers driven by air motors having excellent explosion proof properties are used.

In general, the gearbox of the valve switchgear has a worm gear, but the efficiency is poor.

In addition, when the valve is completely closed, malfunction is often caused by rusting or galling between the valve disc and the valve body.

As a countermeasure, conventionally, about 50% of the normal torque has been increased due to the impact of the hammer blow during the valve opening operation. However, since this torque acts on the insertion time, there is a drawback that it is not reliable and has low reliability.

In view of such a situation, an object of the present invention is to provide an air motor-driven valve switch that is compact and has good gear efficiency by ensuring the opening operation in the valve complete closing.

1 is a front view of the valve opener of the present invention.

FIG. 2 is a view seen from A-A in FIG. 1; FIG.

3 is a valve top view.

4 is a view of a female screw.

5 is a view of the boss.

6 is a detailed view of the primary reduction gear unit.

7 is a view of the primary drive shaft.

8 is a valve bottom view.

9 is an air control system diagram of the present invention.

(Explanation of symbols for the main parts of the drawing)

DESCRIPTION OF SYMBOLS 1 Valve switch 2 Air motor 2a Gear 3 Upper case

4: Bolt 5: 1st reduction gear part 6: 2nd reduction gear part

7: 3rd reduction gear part 8: large gear 9: valve 10: yoke

11 Female thread 12 Male thread 13 Boss 14 Washer

15 Nut 16 Lower Case 17 Handle Shaft 19 Manual Handle

20: connecting pin 22: handle receiving 25: primary drive shaft 25a; spin

27: gear 28: bearing 29: piston 30; cylinder

31, 32, 33, 35, 36, 39, 40: gear 34: secondary drive shaft

37: 3rd drive shaft 39, 40: gear 41: manual arm

42: spring cases 43 and 46; Spring 44: Gear Case

45 carrier 48 torque detection arm

50: adjusting bolt 51: torque detection valve 52: valve opening and closing detection mechanism

53: Slide shaft 54: Striker 55: Valve fully closed detection switch

56: valve full open detection switch 57: spring 58: valve full close detection arm

59: valve fully open detection arm 60: air source 61: conduit

63: filter 64: pressure reducing valve 65, 79, 81, 91: conduit

66: oil feeder 68, 71: 3-position 4-way valve 68a: pressure-actuated actuator

76: fully closed indication lamp 77, 85: spring-type 2-position 3-way valve

78: clutch cylinder 80, 83: 2-position 4-way valve

82: unfold display lamp 84: clutch mechanism 86: valve disc

87: valve body 88: pin receiving 89: collar 90: spring

92 cover 93 spring receiving 94 bolt

In order to solve this problem, the present invention is provided by arranging two high and low speed primary drive gears rotatably fitted to the primary drive shaft, and each of the primary drive gears on the secondary drive shaft. A gear having a driven tooth and a secondary driving tooth which are engaged with each other is arranged and installed, and between each clutch tooth formed in the inner diameter of each primary drive gear by an air cylinder, Reciprocating protrusions integrated with the interlocking primary drive shaft are reciprocated.

The predetermined distance at which the valve starts to close completely closes the clutch teeth of the primary drive gear on the low speed side to generate a large torque, thereby reliably opening the valve, and at the point when the protrusion passes the predetermined distance, the high speed side In combination with the clutch teeth of the primary drive gear, the normal torque and the highway valve opening operation are performed.

When closing the valve, this projection is engaged with the clutch teeth of the primary drive gear on the high speed side to close the normal torque and highway valve. Each of these gears used a spur gear system with good efficiency.

When the valve is fully closed, malfunction is often caused by rust between the valve disc and the valve body or by the galling.

As a countermeasure, conventionally, about 50% of normal torque increased by the impact of a hammer blow when a valve started to open. This torque, however, has the drawback of being unreliable and of low reliability because of its ability to act in a short time. In the present invention, as a countermeasure, the torque increases about 50% continuously until the valve starts to open.

In addition, a clutch is built into the drive gear to reduce the size of the switch and improve the transmission efficiency by using a spur gear.

Hereinafter, the present invention will be described in detail with reference to one embodiment.

(Example)

1 is a front view of a valve switch of the present invention, FIG. 2 is a view seen from A-A of FIG. 1, and FIG. 3 is a top view of the valve. In FIG. 1, the air motor 2, which is the prime mover of the valve switch 1 of the present invention, is mounted to the upper case 3 of the valve switch 1 with a bolt 4. The rotational force of the gear 2a of the air motor 2 is biased to the standby gear 8 via the primary reduction gear portion 5, the secondary reduction gear portion 6, and the tertiary reduction gear portion 7. .

FIG. 3 shows an upper view of the valve 9, and the male screw 12 which moves only up and down without engaging the female screw 11 rotatably fitted to the yoke 10 is engaged. Therefore, when the female screw 11 rotates, the male screw 12 moves up and down to open and close the valve 9.

As shown in FIG. 4, the hexagonal part 11a is provided in the outer periphery of the female screw 11, and the female screw 11b is processed in the center part. Normally, the manual handle of the valve is attached to the hexagonal portion 11a. However, in the case of mounting the valve switch 1 of the present invention, the boss 13 shown in Fig. 5 is attached to the hexagonal portion 11a.

3, the axial movement of the female screw 11 is limited by the jaw portion 11c, the collar 89, the boss 13, the washer 14, and the nut 15 of the female screw 11. do.

The relationship between the valve switch 1 and the boss 13 is shown in FIG. 2, and the concave-shaped hole 8a of the atmospheric gear 8 of the valve switch 1 and the protrusion 13a of the boss 13 are shown. Is engaged to transmit torque. Moreover, the valve switch 1 of this invention is attached to the valve 9 by the mounting tool which is not shown in figure.

In FIG. 1, the air gear 8 is rotatably fitted in the shaft hole 3a, 16a of the upper case 3 and the lower case 16. As shown in FIG. The handle shaft 17 is attached to the end face of the gear 8 by the bolt 18.

The inner diameter portion of the manual handle 19 is rotatably fitted with the handle shaft 17, and is connected to the handle shaft 17 by a connecting pin 20 during manual operation. When the manual handle 19 is not used, the connection pin 20 is pulled out of the handle shaft 17 for safety so that the rotational force of the handle shaft 17 is not transmitted to the manual handle 19. The connecting pin 20 is slidably supported in the pin receiver 88.

In addition, the manual handle 19 is rotatably fitted to the handle support 22, which is mounted to the upper case 3 with the bolt 21, the movement in the axial direction is limited to the snap ring (23). The upper case 3 and the lower case 16 are fixed with the bolt 94 shown in FIG. 2 via the packing 24.

6 shows a detailed view of the primary reduction gear unit 5, in which a gear 27 fixed to the primary drive shaft 25 by a pin 26 is engaged with the gear 2a of the air motor 2. The shaft 25 is supported by the shaft hole 16a of the bearing 28 and the lower case 16. The bearing 28 is fixed to the inner diameter of the piston 29 and advances with the primary drive shaft 25 when the piston 29 moves forward.

The shaft 26 is the center hole 31a, 32a of the cylinder 30 fitted in the upper case 3, the low speed side primary drive gear 31, and the high speed side primary drive gear 32. And axially slidably disposed in the shaft hole 16a.

When compressed air is supplied to the air chamber 29a of the cross section of the piston 29 from the air hole which is not shown in figure, the piston 29 advances, and when it exhausts compressed air, it will retreat by the spring 90. As shown in FIG.

As shown in FIG. 7, the protrusion 25a is formed in the outer diameter part of the primary drive shaft 25, and when this shaft 25 advances and retracts, this protrusion 25a will become the gear 31 shown in FIG. Engagement with the clutch teeth 31b or 32b of the gear 32 transmits rotational force. These gears 31 and 32 are always meshed with the driven teeth 33a and 33b of the gear 33 of the secondary reduction gear part 6.

Accordingly, when the projection 25a is engaged with the gear 31 having fewer teeth than the gear 32, the reduction ratio becomes large, and when the projection 25a is engaged with the gear 32, the reduction ratio becomes small. These reduction ratios increase approximately 50%. This is effective when it starts to open at the valve complete closure. That is, when the valve starts to be closed completely, the valve disc 86 and the valve body 87 shown in FIG. 8 may cause malfunction due to rust or galling, and thus generally increase the valve operation torque by 50%.

And the clutch mechanism 84 of this method is small compared with the conventional clutch mechanism.

At the end of the gear 33 that is rotatably fitted to the secondary drive shaft 34, a secondary drive tooth 33c for driving the third reduction gear unit 7 is a toothed portion 35a of the gear 35. ) Is engaged.

As shown in FIG. 1, FIG. 6, the tooth part 35b of the other end of the gear 35 is attached to the tooth part 36a of the gear 36 rotatably fitted to the secondary drive shaft 34. As shown in FIG. Interlocked

The toothed portion 36b at the other end of the gear 36 is engaged with the gear 39 which is stopped by the key 38 on the tertiary drive shaft 37 as a drive gear. The gear 35 is rotatable to the gear 39. In addition, the rotational force is transmitted to the standby gear 8 by the gear 40 which is stopped by the key 38 to the tertiary drive shaft 37.

The tertiary drive shaft 37 shown in FIG. 1 is slidably arranged in the axial direction, is moved forward by the manual arm 41, and retracted by the spring 43 housed in the spring case 42.

When manually opening / closing the valve 9 with the manual handle 19, the shaft 41a of the manual arm 41 is rotated with a lever (not shown) to advance the tertiary drive shaft 37 so that the key 38 is rotated. The gear 40 is pulled out of the gear 40 so as to be rotatable about the tertiary drive shaft 37.

Thus, when manually opening and closing the valve 9, the gear reversed by the standby gear 8 is only the gear 40, so that the manual handle 19 can be lightly turned.

The tertiary drive shaft 37 pivoted on the gear case 44 is rotatable about the secondary drive shaft 34. Therefore, in FIG. 2, when the gear 8 rotates clockwise by the gear 40, the tertiary drive shaft 37 and the gear case 44 are centered on the secondary drive shaft 34 by the rotation reaction force. Rotate clockwise. This rotation reaction force is supported by the spring 46, the spring bearing 93, and the bolt 4 via the carrier 45. As shown in FIG. The force of the spring 46 is adjustable with bolts 47 protected by the cover 92 before and after use.

At one end of the gear case 44, the torque detection arm 48 is mounted with a bolt 49, and the torque detection valve 51 is connected to the tip of the torque detection arm 48 via the adjustment bolt 50. ). That is, the torque detection valve 51 operates when the rotational torque of the standby gear 8 reaches the set value.

In Fig. 2, the valve open / close detection mechanism 52 is driven by a deceleration mechanism in the middle, not shown, with the standby gear 8 as the drive gear. By the striker 54 fixed to the slide shaft 53, the valve fully open and the fully closed detection switches 55 and 56 operate. The slide shaft 53 is maintained in a neutral position by the spring 57, and the valve fully closed detection arm 58 or the valve fully open detection arm 59 fixed to the shaft 53 is connected to a moving tool (not shown). By moving it in the axial direction. The detection arms 58 and 59 can be fixed at an arbitrary position by a fixing screw not shown in the slide shaft 53.

9 shows an air control system diagram of the present invention. Compressed air is fed from an air source 60 to a conduit 61, a papermaking valve 62, a filter 63, a pressure reducing valve 64, a conduit 65, a lubricator 66, and a conduit 67. It enters a three-position four-way valve 68 via. The conduit 69 then enters the air motor 2, passes through the conduit 70, and is discharged from the four-way valve 68 to the atmosphere. In this case, the air motor 2 rotates forward and the valve 9 opens. Then, when the compressed air exits the conduit 70, their relationship is reversed, and the air motor 2 is reversely rotated, and the valve 9 is closed.

The compressed air of the conduit 65 is a three-position four-way valve 71, a valve full close detection switch 55, a valve full open detection switch 56 and a clutch cylinder 78 for operating the four-way valve 68. The spring-loaded two-position, three-way valve 85 is operated.

The compressed air coming out of the four-way valve 71 enters the pressure-actuated actuator 68a of the four-way valve 68 via the conduits 72 and 74, thereby switching the four-way valve to the forward rotation position, thereby providing an air motor. The valve (9) is opened by rotating (2) forward. Likewise, when the compressed air enters the pressure-actuated actuator 68b via the conduits 73 and 75, the air motor 2 rotates in reverse and the valve 9 is closed.

And the compressed air of the conduit 74 flows also into the pressure actuating actuator 85a of the spring-type 2-position 3-way valve 85, and makes the clutch cylinder 78 operable.

The valve complete closing detection switch 55 is a spring-type two-position three-way valve. When the valve 9 is completely closed, the detection switch 55 switches, and the compressed air flows into the conduit 91 to detect the torque detecting valve 51. ), The pressure-actuating actuator 77a of the spring-loaded two-position three-way valve 77 for operating the fully closed indication lamp 76 and the clutch cylinder 78 is entered.

Thus, the clutch cylinder 78 is operated so that the projection 25a of the primary drive shaft 25 meshes with the clutch tooth 31a of the low speed side primary drive gear 31 to increase the operating torque by 50%. Is when the valve starts to open, i.e. it opens a certain distance from the valve complete closure. The protrusion 25a is engaged with the clutch teeth 32b of the high speed side primary drive gear 32, including the case where the valve 9 is closed except under this condition. Open and close at high speed. This makes it possible to open and close the valve reliably and efficiently.

The torque detection valve 51 is a spring-type 2-position 3-way valve, and when the valve opening operation torque reaches the set value, the compressed air enters the pressure-actuating actuator 80a of the 2-position 3-way valve 80 from the conduit 79 to the conduit. The valve closing operation is stopped by blocking the compressed air supplied from (73).

The valve full open detection switch 56 is a spring-type two-position three-way valve. When the valve 9 is fully open, the compressed air flows into the conduit 81 to operate the fully open indication lamp 82 and at the same time the two-position 4 position valve. It enters the pressure actuating actuator 83a of the room valve 83, interrupts the compressed air supplied from the conduit 72, and stops valve opening operation.

Then, the two-position four-way valve (80), (83) is switched to pressurized air from the conduits (72) and (73) to the respective pressure-operated actuators (80b, 83b) at the time of opening and closing operation. Return to home position.

According to the present invention, it is possible to miniaturize the valve opening and closing by attaching a clutch mechanism that is outside the reduction gear to the inside of the reduction gear. In addition, when the valve disc and valve body start to open when the valve is completely closed, the operation torque of the valve disc and the valve body caused by rust or galling was increased by about 50% by the hammer blow effect. As a result, there was a defect in that there was no continuity and low reliability.

In the present invention, the reliability is very high since about 50% increase in torque continues to work until it starts to open in the valve complete closure.

Moreover, although the gearbox of the conventional valve switchgear has a worm gear mainstream and low efficiency, since the spur gear is used in the present invention, the efficiency is high.

The present invention is a breakthrough invention having the above excellent effects.

Claims (2)

In an air motor drive valve switch that drives a reduction gear with an air motor and switches the reduction gear with an air cylinder, the low speed side and high speed side primary drive gears that are rotatably fitted to the primary drive shaft are disposed adjacent to each other. 하고) and arrange a gear having a driven tooth and a secondary drive tooth engaged with each of the primary drive gears on the secondary drive shaft, and the inner diameter of each primary drive gear. ) And a projection to engage any one of the clutch teeth in the outer diameter portion of the primary drive shaft reciprocated in the axial direction by the air cylinder. switch. The air motor drive valve switch for driving a reduction gear with an air motor and switching the reduction gear with an air cylinder, wherein the predetermined distance at which the valve starts to be opened at the complete closing of the valve at the time of valve opening operation is 1. The projection of the vehicle drive shaft engages the clutch teeth of the low speed primary drive gear, and the clutch teeth of the primary drive gear on the high speed side other than the distance are engaged, and the primary drive shaft is fully open to fully closed when the valve is opened. An air motor-driven valve switch characterized in that the projection of the motor control circuit is engaged with the clutch teeth of the primary drive gear of the high speed side.