JPS5983879A - Valve operating apparatus - Google Patents

Abstract

PURPOSE:To prevent a water hammer phenomenon by allowing a valve to be opened and closed at a constant speed at the perfect or the intermediate opening degree and to be gently opened and closed in the vicinity of a cloure position by permitting input operaion at a constant speed, in operating the valve. CONSTITUTION:When a handle 14 is turned clockwise at a constant speed for closing a valve 14 from the perfect opened position, a female screw member 19 and a valve rod 4 are shifted integrally in the closing direction, and the closing speed becomes max. at the perfect or the intermediate opening degree, during closing process. In the vicinity of closure position, when a roller 28 reaches an inclined groove 27b or 27c, the speed for the valve rod 4 to shift in the direction of closure is reduced by the inclined grooves 27b and 27c, and a valve piece 2 gently closes a valve port 3, and a water hammer phenomenon is prevented.

Description

[Detailed description of the invention] This invention applies to drive devices such as gate valves and globe valves.

In general, in order to prevent water hammer due to sudden closure, it is desirable for a valve to be opened and closed more slowly near the closed position than when fully opened or at an intermediate opening.

When opening and closing conventional gate valves and globe valves manually, the lead of the valve stem screw and the reduction ratio of the gear are constant, so they are driven at a nearly constant opening/closing speed over the entire opening/closing stroke. Therefore, the above problem cannot be achieved.

When opening and closing with an electric motor, methods are used such as incorporating a timer into the operating circuit and automatically repeating inching and stopping near the closing position to close the door, or using a variable speed motor. ¥'ff construction becomes complicated and expensive. In addition, when opening and closing with a cylinder, a limit switch is used to operate a throttle valve to limit the supply of driving fluid.
Methods such as slowing down the opening and closing speed have been adopted,
This also has problems, such as the structure being complicated and expensive.

This invention solves the problems of the conventional drive device as described above, and by inputting the input at a constant speed, it opens and closes at a constant speed at full open and intermediate openings, and slowly opens and closes near the closed position, thereby reducing the water flow. The object of the present invention is to provide a valve driving device that prevents hammering and has a simple structure.

The object of the present invention is to connect a drive shaft with a valve body connected to a valve body and prevented from rotating, and to have a guide groove 3 in which the female thread member is engaged and guided. A guide tube is fitted and inserted in the moving direction of the female threaded member, and the guide groove is formed of a straight groove parallel to the valve body and the drive shaft, and an inclined groove connected to the straight & 1 groove, and in the valve open state, the guide groove is a straight groove. This is achieved by providing a valve driving device in which the internally threaded member is engaged with and guided by the inclined groove near the closed position.

Embodiments of the present invention will be described below with reference to the drawings. The figure shows an example of implementation in a gate valve.

1 to 6 show a first embodiment applied to a valve that is opened and closed by rotation of a driving source, in which 1 is a valve box, 2 is a valve body that opens or closes a valve port 3, and 4 is a block 5 and a pin 6. The valve body is integrated with the valve body IK and is connected to the valve body 2, and a guide portion 7 provided on the valve body 2 is fitted with a guide portion 8 provided on the valve body IK to prevent rotation. 9 is a lid, 10 is a stand, 11 is a case, and 12 is a yoke, which are fixed to the valve box 1 by means of bolts and nuts.

Reference numeral 13 denotes a sleeve, and a handle 14 is fixed to the sleeve 15, and is rotatably fixed to the yoke J2. 16 is the drive shaft, male thread l'? is screwed into an internal thread 18 provided on the sleeve 13.

19 is a female threaded member fixed to the drive shaft 16 by a pin 20, a nut 22 provided with a female thread 21 is fixed integrally with a bolt 23, and the female thread 21 is connected to a male thread 24 provided on the valve body 4.
It is threadedly connected.

The male thread 17, female thread 18 and the male thread 24, female thread 21 have opposite twisting directions.
The twisting direction of g is to the left, and the twisting directions of male thread 24 and female thread 21 are right. Also, male thread 24, female thread 21
The lead is larger than the male thread 17 and female thread 18 (for example, the helix angle is 45°). In the direction of movement of the female threaded member 19, a guide tube whose lower end is fixed to the stand 10 with a bolt 26 and whose upper end is fitted into the yoke 12 and is disposed inside the case 11 is inserted, and this guide s25 is inserted. A vertical guide groove 27 is provided on the opposing peripheral wall. As shown in FIG. 6, the guide groove 27 has a straight groove 27a parallel to the valve stem 4 and the drive shaft 16, and an inclined direction 27b1 and α inclined by α with respect to a straight groove 27m sequentially connected to the lower end of the straight groove 27&. , formed by the inclined groove 27e, which has an inclined angle α,
and α, are α, kuα.

Note that the inclined direction of the inclined grooves 27b and 27e is on the right and the male thread 24
The direction of twist is the same as that of the

28 is attached to the female threaded member 19 by a bolt 29,
It is a four-wheel that engages with the guide groove 27.

The engagement relationship between the roller 28 and the guide groove 27 is such that the groove moves in a straight line 27a when the valve is fully open or at an intermediate opening, and moves in an inclined direction 27b127o as the valve closes near the closing position. 30 is a packing, and 31 is a packing presser.

In the embodiment with the above configuration, when closing the valve from the fully open position shown in FIG. The rotation attempt was thwarted at 27 &, and the valve body 4
Since the rotation of the handle 14 is also prevented, both move in the closing direction as one unit, and the moving layer of the valve body 3 becomes the lead of the male screw 17 multiplied by the number of rotations of the handle 14, and the closing vA speed is maximum during closing.When the reroller 28 reaches the inclined groove 27b near the closing position, the female threaded member 1
9 is rotated clockwise, the drive shaft 16 is also rotated in the same way, and the moving layer of the drive shaft 16 and the female thread member is rotated clockwise.
7 multiplied by the number of rotations of the handle 14, and the closing speed is smaller than when it is in the straight groove 27a. Further, since the male thread 24 of the valve body 4 is a right-handed thread, the valve body 4 moves toward the drive shaft 16 by clockwise rotation of the female thread member 19. Therefore, the speed at which the valve stem 4 moves in the closing direction becomes slower because it is the difference between the closing speed of the female threaded member 19 and the speed at which the valve w, 4 moves toward the drive shaft 16 side (opening side).Next, the roller 28 When reaches the inclined groove 27c, the inclination angle α,
is larger than the inclination angle α, so the rotation ratio of the female threaded member 19 to the rotation of the handle 14 is greater than that of the inclined groove 27b.
The closing speed of the valve stem 4 becomes slower, the speed at which the valve stem 4 moves toward the drive shaft 16 becomes faster, the speed at which the valve body 4 moves in the closing direction becomes slower than the inclined groove 27b, and the valve body 2 moves toward the valve port 3'. f:
Water hammer is prevented because it closes slowly.

When opening the valve from the fully closed position shown in Figure 1, use handle 1.
4 in the counterclockwise direction, the roller 28 moves into the inclined groove 27.
The opening speed becomes faster as it moves from the inclined groove 27b1 to the straight groove 27a.

Fig. 7 shows a second example 1+rii applied to a valve that is opened and closed by linear movement of the driving source, in which the female thread tlils material 19 is attached to the ring 32, and the mounting +) Is 'I+33.
Several parts are rotatably connected to the drive shaft 16 via. This embodiment has a screw 17 and a female screw 18 as in the first embodiment.
In the case where the drive shaft 16 is moved by screwing,
Although it is necessary to prevent the rotation of the drive shaft 16, it is not necessary to prevent the rotation in cases where the drive shaft 16 is connected to a two-stone rod of a cylinder, or where a two-stone rod is used as the drive shaft 16.

Regarding the opening/closing speed, the speed of the drive 111IIi6 and the female screw member 19 is the same as that of the straight groove 27a1 and the inclined groove 27b127e.
Although there is no change throughout the rotation, the valve stem moves in the opposite direction due to the rotation of the female threaded member 19, so the opening/closing speed of the valve stem is the same as that of the roller 2.
8 becomes slower as it moves from the straight groove 27m to the inclined groove 27b1 and the inclined groove 27(), and the valve body 2 gently closes the valve port 3 near the closing position, so water hammer is prevented.

FIG. 8 shows a third embodiment which is applied to a valve that is opened and closed by a linear motion of the drive source in the same way as the second embodiment, in which the female threaded member 19 is connected via the split ring 32 and the mounting member 33. It is rotatably mounted on the valve body 4 in the opposite direction to the previous embodiment, and the female thread 21 is screwed into the male thread 24' provided on the drive shaft 16 (not shown in this embodiment). However, like the valve stem 4, the drive shaft 16 is prevented from rotating, and the direction of twist of the external thread 24' and the direction of inclination of the inclined grooves 27b, 27c are opposite to each other. Furthermore, the opening/closing speed is the same as in the second embodiment. Incidentally, in the first to third embodiments, the inclined grooves are formed into inclined grooves 727b and 27e with different inclination angles, but this may be omitted from the illustration or the inclined grooves whose inclination angle continuously increases from the straight groove 27a. It becomes possible to gradually slow down the opening and closing speed.

FIG. 9 shows the opening/closing speed V depending on the valve opening degree, where the solid line shows the first to third embodiments, and the chain line shows one row of inclined grooves whose inclination angle increases continuously from the straight groove 27a. There is. In the figure, 0 is fully open, S is fully closed, and P is the straight groove 27a and the inclined groove 27.
b indicates the connection position, and Q indicates the connection position between the inclined groove 27b and the inclined groove 27a. Furthermore, by changing the position of the inclined groove, the angle of inclination, and the lead of the screw, an opening/closing speed that matches the specifications of the valve used can be obtained.

As described above, the valve drive device of the present invention opens and closes at a constant speed when fully open and at intermediate openings by inputting an input at a constant speed, and opens and closes gently near the closed position, so that the water hammer does not occur. It is prevented, and the structure is simple,
In addition to those in which the driving source rotates, they also move in a straight line.
It is useful for use with any valve that opens or closes.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a part showing an embodiment of the present invention, Fig. 2 is a longitudinal sectional side view of the IIA same as above, Fig. 3 is an enlarged sectional view of the main part showing the operating state, and Fig. 4 is a guide cylinder. FIG. 5 is an enlarged cross-sectional plan view taken along line V-V in FIG. 1; FIG. 6 is a developed front view of the guide tube;
Fig. 7.8 is an enlarged sectional view showing another embodiment of the present invention, and Fig. 9 is a drawing showing the opening/closing speed V depending on the valve opening degree. l...Valve box 2...Valve body 3...Valve port
4... Valve stem 16... Drive shaft 19
... Female thread member 25 ... Guide tube 27 ...
Guide groove 27a... straight groove 27 bs 27
c... Slanted groove 28... Roller fan 2 closed

Claims (1)

[Scope of Claims] 1. The valve stem is connected to the valve body and is prevented from rotating, and the drive shaft is connected by a female threaded member, and the guide cylinder has a guide groove in which the female threaded member is engaged and guided. The guide groove is formed by being fitted in the direction of movement of the screw member, and the guide groove is formed of a straight groove parallel to the valve body and the drive shaft, and an inclined groove connected to the straight groove. Here is a valve driving device in which the female threaded member is engaged and guided in an inclined groove. 2. The valve drive device according to claim 1, wherein the female thread member is fixed to the drive shaft, and the female thread member and the valve body are screwed together. 3. The valve drive device according to claim 1, wherein the female thread member is rotatably mounted on the drive shaft, and the female thread member and the valve body are screwed together. 4. The valve drive device according to claim 1, wherein the female threaded member is rotatably attached to the valve stem, and the female threaded member is threadedly engaged with the drive shaft.