JP3452873B2 - Opening / closing device for rotary valve with auxiliary valve - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sub-valve provided at the center of a main valve, and both valves are rotated by a single operating shaft to open and close the valve. The present invention relates to an opening and closing device for a rotary valve with an auxiliary valve. 2. Description of the Related Art A rotary valve with a sub-valve will be described with reference to FIGS. 1 to 3 which show an embodiment of the present invention. The shaft 3 is guided out of the valve box 1, and a sub-valve 4 is provided at the center of the main valve 2, and the sub-valve 5
Through the main valve shaft 3, and the main and sub valve shafts 3, 5
Is selectively rotated to selectively rotate the main valve body 2 and the sub-valve element 4 to open and close the valve. For example, as shown in FIG. 11A, by closing both valve bodies 2, 4, the valve V is completely closed. When the valve is opened, first, as shown in FIG. The body 4 is opened, and then the main valve body 2 is opened as shown in FIGS. 13 (a) and 14 (a) (valve fully opened). At the time of opening, the sub-valve 4
The opening of the main valve body 2 is easy by opening in advance (see FIG. 12A). On the other hand, when the valve is closed, first, FIG.
5 (a), the main valve element 2 is closed with the sub-valve element 4 open as shown in FIG. 16 (a), and then the sub-valve element 4 is closed as shown in FIG. Closed). At this time, since the main valve body 2 is closed while the sub-valve body 4 is open, the water hammer pressure is greatly reduced even if the main valve body 2 is quickly closed. In addition, the flow rate can be finely adjusted depending on the degree of opening and closing of the sub-valve element 4. In many of the rotary valves V with the sub-valve, the main valve body 2 and the sub-valve body 4 are respectively rotated by different operation shafts. The technology (valve opening / closing device) performed by the operation shaft is patent No. 26553.
No. 80 and the like. The valve opening and closing device is
The intermittent engagement of the toothless gear causes the main and auxiliary valves 2 and 4 to open and close, and to perform self-locking. [0005] The above-mentioned conventional valve opening / closing device using one operating shaft makes fine adjustments of a series of prescribed operations of the main valve body 2 and the sub-valve body 4 by using the sub-valve shaft 5 and the sub-valve. The adjustment is performed with an adjustment ring provided at the joint with the large spur gear for a valve. For this reason, if an excessive load acts on the adjustment ring due to secular change due to long-term use or foreign matter biting into the sub-valve, the set positions of both valve bodies will change, and the main valve body 2 and the sub-valve will be changed. A series of prescribed actions of the body 4 are broken. In addition, when the teeth of the fully closed position locking function of the main valve body 2 are lost due to an excessive load, a series of specified operations of the main valve body 2 and the sub-valve body 4 are similarly broken. Further, since the sub-valve 4 performs the same operation in conjunction with the main valve operation after the independent sub-valve operation, when the main valve is fully opened, the sub-valve is also fully opened and projects into the water flow. The pressure loss when fully opened increases. In addition, when water leaks from the sub-valve, it is not possible to easily adjust the fully closed position of the sub-valve element 4 from the outside to stop water from a structural aspect due to the engagement. [0007] The operating torque of the valve is maximized at the time of closing and closing and at the start of the opening operation. However, in the prior art, the rotational torque applied from the operating shaft to the valve shaft is constant from the start to the end of the operation. Therefore, a gear mechanism having a size corresponding to the maximum torque must be provided, and the entire apparatus becomes large. It is an object of the present invention to enable a main valve shaft and a sub-valve shaft to be rotated by one operating shaft with a self-locking function without using a gear mechanism. In order to solve the above problems, the present invention firstly moves a slide block screwed into the screw shaft by rotating a screw shaft serving as an operation shaft. Then, the movement is transmitted to the main and sub valve shafts to obtain a self-locking function. In this way, with the screw-in structure, even if the main and sub valve shafts try to rotate, the slide block cannot move, and self-locking is performed. Next, in the present invention, the transmission of the force from the slide block to the main and sub-valve elements is achieved by a Scotch and yoke mechanism. Scotch and yoke mechanisms can convert linear motion into rotary motion. Therefore, the linear movement of the slide block can be converted to the rotation of the main and sub valve shafts. According to an embodiment of the present invention, a sub-valve is provided at a center portion of a main valve, and a sub-valve of the sub-valve is passed through a main valve shaft of the main valve. Then, by selectively rotating the main / sub valve shaft, the main valve and the sub-valve are selectively rotated, and when the valve is opened, the sub-valve is opened first, and then the main valve is opened. When the valve is opened, first, the main valve body is closed with the sub-valve body being opened, and then the sub-valve body is opened and closed. The main screw shaft for the main valve and the auxiliary screw shaft for the sub valve in the orthogonal direction are provided in parallel so as to be rotatable around their respective axes, and a slide block is screwed into each of these screw shafts so as to be movable in the respective axial directions. Both screw shafts are connected to the operation shaft provided on the casing via a main clutch and a sub clutch, respectively. By rotating the operating shaft, the two clutches are selectively turned on / off to selectively rotate the two screw shafts, and the rotation causes the two slide blocks to be selectively moved. A configuration is employed in which the main valve body and the sub-valve are selectively rotated by rotating the sub-valve shaft. In this configuration, when the valve is fully closed, first, the main clutch is off and the sub clutch is in the on state. From this state, when the operation shaft is rotated in the valve opening direction, only the sub screw shaft is used. Is rotated, and the sub-slider thereon moves as the slide block that is screwed therewith moves. By this movement, the sub-valve shaft rotates and the sub-valve element is opened. On the other hand, since the main clutch is off, the main screw shaft does not rotate, and the main valve body remains closed. Next, when the sub-valve is rotated by 90 degrees and opened, the sub-clutch is turned off, the main clutch is turned on, only the main screw shaft is rotated, and the main valve body is opened. At this time, since the sub-screw shaft does not rotate, the sub-valve does not move, but is accommodated in the main valve (the sub-valve is fully closed).
The sub-valve does not protrude into the water flow and a large pressure loss does not occur. The valve fully closing operation is performed by the reverse operation of the above by operating the screw shaft in a reverse rotation operation. The conversion from the linear movement of the slide block to the rotation of the main and auxiliary valve shafts can be constituted by a Scotch and yoke mechanism. The scotch and yoke mechanism includes a main yoke and a sub yoke in the lateral direction provided on the main valve shaft and the sub valve shaft, respectively, and a slider on the slide block slidably fitted in grooves of both the yokes. The sub-clutch is turned on and off and the main clutch is turned on and off by moving the sub-slide block when the sub-valve is opened, and the sub-clutch is turned on and off and the main clutch is turned on and off. The main slide block is moved when the main valve is completely closed. As described above, the operation of opening and closing the valve by rotating the yoke projecting laterally from the valve shaft requires only a small valve shaft rotation torque. For example, in the case of a butterfly valve, the valve is opened and closed. It has characteristics similar to shaft torque,
The operating force or the operating torque is reduced. Also, Scotch
Since the power is transmitted by the yoke mechanism and the screw, it has a self-holding (self-locking) function that prevents the valve from closing itself. In addition, since power is transmitted by screws, changing the screw lead can easily increase or decrease the valve shaft rotation speed for one rotation of the screw shaft, has a self-locking function at an intermediate opening, and provides flow and pressure Adjustments are possible. In this operation, it is preferable to regulate the position of the main valve and the sub-valve when they are fully opened or fully closed. For example, a stopper for fully opening and fully closing the valve is provided between the casing and the main valve shaft and the sub-valve shaft. The stopper is screwed into the casing and comes into contact with both yokes to determine the fully open position and the fully closed position of the valve. In this configuration, when the valve is fully closed and when the valve is opened and closed, the grooves of the two yokes are inclined by 45 degrees with respect to the valve opening moving direction or the valve closing moving direction of the slide block to the slide block. If the contact surface of the yoke groove with the slider is bent so as to be parallel to the respective screw axes from the time when the main and sub valves are completely opened or closed, the yoke swings. The valve is fully opened or fully closed at the time of 45 degrees left and right from the center, and thereafter, the slider slides on a surface parallel to the screw shaft, and does not exert a rotating action on the valve shaft. For this reason, unnecessary rotational force does not act on the valve body, and damage can be prevented. FIG. 1 to FIG. 17 show an embodiment of a butterfly valve device with a built-in sub-valve, in which a main valve body 2 is provided in a valve box 1 provided in a pipeline. Is provided to guide the main valve shaft 3 out of the valve box 1, and a sub-valve body 4 is provided at the center of the main valve body 2 to penetrate the sub-valve shaft 5 through the main valve shaft 3 (FIG. 1). To FIG. 3). In the figure, 6 is a main valve seat and 7 is a sub valve seat. A casing 10 of the opening / closing device A is bolted to the upper surface of the valve box 1 via a stand 8, and the main and sub valve shafts 3 and 5 reach the casing 10 (FIG. 4).
reference). The main valve shaft 3 (sub valve shaft 5) is provided in the casing 10.
Main shaft 11 for main valve and sub-shaft 1 for sub-valve in the orthogonal direction
2 are laid in parallel via a bearing 13 so as to be freely rotatable,
The two screw shafts 11 and 12 are reverse screws. The auxiliary screw shaft 12 is provided with a main clutch 31 and an auxiliary clutch 32 at a reduced diameter portion 12a, and a bevel gear 15 is provided at the reduced diameter portion 12a.
a is rotatably provided, and the bevel gear 15a is connected to an operation shaft 16 via a bevel gear 15b. When the operation shaft 16 is rotated via a cap 17, the bevel gear 15a is rotated.
a turns. A spur gear 14a is rotatably fitted on the shaft of the bevel gear 15a, and a spur gear 14b fixed to the main screw shaft 11 meshes with the spur gear 14a.
, The main screw shaft 11 rotates. Double screw shaft 1
Slide blocks 18 and 19 are screwed into 1 and 12, respectively, and pins 20 and 21 serving as sliders are respectively provided on the slide blocks 18 and 19 so as to protrude upward and downward. A guide roller can be fitted to the pins 20 and 21 to facilitate movement. A main yoke 22 and a sub yoke 23 are provided on the main and sub valve shafts 3 and 5, respectively, with a spline bush 22a, a key 22b,
3b so as to protrude in the lateral direction (FIG. 4,
(See FIG. 9). The two screw shafts 11, 12 are inserted between the upper and lower forks of the two yokes 22, 23, and the upper and lower sliders (pins) 20 of the main screw shaft 11 are slidably fitted in the upper and lower grooves 24 of the main yoke 22. In other words, the upper and lower sliders (pins) 21 of the auxiliary screw shaft 12 are slidably fitted in the upper and lower grooves 25 of the auxiliary yoke 23, and when the sliders 20, 21 move on the screw shafts 11, 12, the slider 20, 21 with grooves 24, 25
The yokes 22 and 23 rotate while sliding inside, and the main and sub valve shafts 3 and 5 also rotate to open and close the main valve body 2 and the sub valve body 4. When the valves are fully opened and the valves are fully closed, the grooves 24 and 25 of the yokes 22 and 23 are inclined 45 degrees with respect to the valve closing movement direction or the valve closing movement direction of the sliders 20 and 21, respectively. 20, 21), and are bent 24a, 25a so as to be parallel to each other from the time when the main and sub-valve elements 2, 4 are completely opened or closed (see the operation described later). The main and sub clutches 31 and 32 have a gear-like facing surface, and transmit power by meshing their teeth. A bobbin-shaped switch 33 is integrally rotatably and slidably fitted on the shaft of the bevel gear 15a.
Are provided with one tooth of clutches 31 and 32, respectively, and the other tooth of the main clutch 31 is connected to the spur gear 14a.
Meanwhile, the other teeth of the sub clutch 32 are respectively fixed to movers 34 fitted to the sub screw shaft 12 so as to be movable only in the axial direction. Therefore, the switch 33 is moved to the right (yoke 23
Side), the main clutch 31 is disengaged (off),
The sub-clutch 32 is engaged (turned on), and the power of the operation shaft 16 is transmitted to the sub-screw shaft 12 as described later. Conversely, if the switch 33 moves to the left, the main clutch 31 is turned on,
The auxiliary clutch 32 is turned off, and the power of the operation shaft 16 is transmitted to the main screw shaft 11. The auxiliary screw shaft 12 is rotatably supported in the middle by a support leg 36, and a tappet holder 35 is slidably fitted adjacent to the support leg 36. The tappet holder 35 and the switch 33 The tappet is connected by a tappet rod 37, and the tappet holder 35 is slidable on the rod 37. A spring 38 that urges the tappet holder 35 and the switch 33 in a direction separating the tappet holder 35 is mounted in the middle of the rod 37, and the spring 38 presses the tappet holder 35 against the bolt head of the rod 37. A spring 39 is also mounted between the mover 34 and the support leg 36, and the spring 39 urges the both 34 and 36 in the separating direction. A swivel lever shaft 40 is provided in the casing 10 between the main and sub screw shafts 11 and 12 for the main and sub valves.
The two cylindrical bases 41a and 42a are rotatably meshed with each other (see FIGS. 8 and 10). Its base 41
Fan-shaped protrusions 41b and 42b are formed on the opposing surfaces of the bases 41a and 42a, and are locked or separated according to rotation between the bases 41a and 42a. That is, they are appropriately integrated. Each of the two swift levers 41 and 42 is composed of a pair of two swift levers.
Reference numeral 2 indicates that the leading end roller 45 is locked in the recess of the switch 33. Further, the main swivel lever 41 has springs 46 provided on both sides of the protruding piece 41c between the main swivel lever 41 and the casing 10, so that the two springs 46, 46 are stationary at a position where they are balanced. On the other hand, the sub-swift lever 42 is
7, it is urged clockwise (in FIG. 5, in the direction of pushing the switch 33 to the right). Rotation stoppers 50a, 50b, 51a, 51b of the main and sub valve shafts 3, 5 are respectively threaded from the outer surface of the casing 10, and as shown in FIG.
When the projections 52 of the yokes 23 and 24 abut against the respective stoppers, further rotation of the valve shafts 3 and 5, that is, the fully open and fully closed positions of the valve bodies 2 and 4 are regulated. Therefore, by adjusting the screwing amount of each stopper, the fully open and fully closed positions of the valve bodies 2 and 4 can be independently adjusted from the outside. In the figure, stoppers 50a and 51
b, 50b and 51a are vertically overlapped. This embodiment is constructed as described above. Next, its operation will be described with reference to FIGS. 11 to 17. When fully closed, as shown in FIG. 11, the main yoke 22 is connected to the spur gear 14b (left side). ), The pin 20 is located at the bent portion 24a of the groove 24, and the sub-yoke 23 is inclined 45 ° to the opposite side. It is located at the bent portion 25a.
At this time, the sub-swift lever 42 pushes the switch 33 to the right, the main clutch 31 is off, and the sub-clutch 32 is on. In this state, the two swift levers 4
The locking projections 41b and 42b of 1 and 42 are opposed to each other with a gap of α degrees. When the operation shaft 16 is rotated in the valve opening direction from the fully closed state of the valve (in the direction indicated by the arrow in FIG. 12), only the sub-screw shaft 12 is rotated because only the sub-clutch 32 is on, and the sub-slide The block 19 moves and its pin 21
Locks the sub-yoke groove 25, rotates the sub-yoke 23, and opens the sub-valve 4 (FIG. 12A). At the time of opening, the sub-yoke 23 comes into contact with the stopper 51a. Continue to operate axis 1
When the dial 6 is turned, the sub slide block 19 moves further to the left, and pushes the tappet holder 35 as shown in FIG. Then, the switch 33 moves to the left via the rod 37 and the spring 38, the sub clutch 32 is turned off, and the main clutch 3
1 turns on. At this time, the pin 21 is
5a, and does not apply a rotational force to the sub-yoke 23, and prevents movement. Further, the slide block 19 is not moved by the rotational power from the sub yoke 23 because of the screw connection. Therefore, the sub-valve 4 is locked and in a horizontal state (FIG. 12).
(A)) is maintained. The gap between the locking projections 41b and 42b becomes γ degrees due to the leftward movement of the sub-swift lever 42. Further, when the operating shaft 16 is turned, the main screw shaft 11 rotates and the slide block 18 moves to the right by turning on the main clutch 31, and as shown in FIG. The main yoke 22 is rotated by being locked in the main yoke groove 24, and the main valve body 2 is opened (FIG. 14A). At the time of opening, the main yoke 22 contacts the stopper 50a.
Further, even if the operation shaft 16 is slightly rotated, the pin 20 slides on the bent portion 24a of the yoke groove 24, does not apply a rotational force to the main yoke 22, and prevents the movement. The slide block 18 does not move due to the rotational force from the main yoke 22 because of the screw connection. For this reason, the main valve body 2 is locked and maintains a horizontal state (FIG. 14A). The main slide block 1
The main swivel lever 41 is rotated by the movement of the dog 8 even in the dog 44, but when the main swivel lever 41 is rotated by a certain angle, the locking is released, and the main swivel lever 41 is returned (FIG. 13, 1).
4 to the solid line). When the operating shaft 16 is rotated in the closing direction from this fully opened state (in the direction of the arrow in FIG. 15), the main clutch 31 is turned on and the sub-clutch 32 is turned off. The yoke 22 rotates (FIGS. 14 to 1
5), the main valve body 2 is closed (FIG. 16). When this closed,
The main yoke 22 contacts the stopper 50b. When the main screw shaft 11 is further turned after the main valve body 2 is closed, the pin 20 slides on the bent portion 24a of the yoke groove 24,
The main swift lever 41 is pushed to the left via the dog 44.
Then, the locking projection 41b pushes the projection 42b,
The sub-swift lever 42 is rotated, the switch 33 is moved rightward, the main clutch 31 is turned off, and the sub-clutch 32 is turned on (FIGS. 15 to 16). Simultaneously with the switching of the two clutches 31, 32, the main swivel lever 41 gets over the dog 44 and returns (FIG. 17). When the operating shaft 16 is further turned, the counter screw shaft 1
2 rotates, and the sub-yoke 23 rotates to close the sub-valve element 4 (FIG. 17A). At the time of this closing, the sub yoke 23 comes into contact with the stopper 51b. As described above, when the valve is opened, the sub-valve 4 is opened first, then the main valve 2 is opened, and when the valve is closed, the main valve 2 is opened with the sub-valve 4 opened. Close and continue with sub-valve 4
Is performed, and an opening / closing valve action in which the water hammer pressure is greatly reduced is performed. During this operation, both clutches 31, 3
Even if the teeth 2 initially do not mesh with each other, the meshing is surely performed by the rotation of the switch 33 and the urging force of the springs 38 and 39, and the rotational force is reliably transmitted. The spring constants of the springs 38, 39, 46, 47 are appropriately set so as to provide the above-mentioned action. According to the present invention, the main valve shaft and the sub-valve shaft can be rotated by one operation shaft without using a gear mechanism, so that special processing such as gear processing is unnecessary. It will be cheap. In addition, since it has a self-locking function, a self-locking mechanism such as a worm speed reduction mechanism is not required.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a left side view of an embodiment; FIG. 2 is a front view of the embodiment; FIG. 3 is a front view of a main part of the embodiment; FIG. 4 is a cut of the embodiment; Main part front view [FIG. 5] Cut main part plan view [FIG. 6] Left side view of main part of the embodiment [FIG. 7] Schematic front view of main part cut of the embodiment [FIG. FIG. 9 is an exploded perspective view of a main part of the embodiment. FIG. 10 is an exploded perspective view of the main part of the embodiment. FIG. 11 shows the valve of the embodiment in a fully closed state. FIG. 12 (b) shows the operation state of the valve shaft opening / closing mechanism. FIG. 12 (a) shows the valve opening operation state.
(B) shows the operation state of the valve shaft opening / closing mechanism. FIG. 13 shows the valve opening operation state, (a) shows the valve state,
(B) shows the operating state of the valve shaft opening / closing mechanism. FIG. 14 shows the valve opening operating state, (a) shows the valve state,
FIG. 15 (b) shows the operation state of the valve shaft opening / closing mechanism. FIG. 15 shows the state when the valve is fully opened, FIG. 15 (a) shows the valve state, and FIG.
Fig. 16 shows the operation state of the valve shaft opening / closing mechanism. Fig. 16 shows the state when the valve is fully opened, (a) shows the valve state, (b)
Fig. 17 shows the operation state of the valve shaft opening / closing mechanism. Fig. 17 shows the state when the valve is fully opened, (a) shows the valve state, (b)
Is the operating state of the valve shaft opening / closing mechanism [Description of symbols] 1 Valve box 2 Main valve body 3 Main valve shaft 4 Sub valve body 5 Sub valve shaft 10 Valve opening / closing device casing 11 Main screw shaft for main valve 12 Sub screw for sub valve Shaft 16 Operating shaft 18 Main slide block 19 Sub slide block 20 Main slider (pin) 21 Sub slider (pin) 22 Main yoke 23 Sub yoke 24 Main yoke groove 24a Bend portion of main yoke groove 25 Sub yoke groove 25a Sub yoke groove Folded part 31 Main clutch 32 Sub clutch 33 Clutch switch 41 Main Swift lever 42 Sub Swift levers 50a, 50b, 51a, 51b Stopper A Valve opening / closing device V Rotary valve with sub valve

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2000-74255 (JP, A) JP-A-2000-28008 (JP, A) JP-A-6-94156 (JP, A) JP-A-61-252986 ( JP, A) JP-A-2000-193130 (JP, A) JP-A-61-101173 (JP, U) JP-A-53-97436 (JP, U) JP-B-48-16934 (JP, B1) (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 1/22 F16K 31/44

Claims (1)

(57) [Claim 1] A sub-valve 4 is provided at the center of the main valve 2, and the sub-valve 5 of the sub-valve 4 is mounted on the main valve shaft 3 of the main valve 2. And selectively rotating the main / sub valve shafts 3 and 5 to selectively rotate the main valve body 2 and the sub valve body 4, and at the time of valve opening, first open the sub valve body 4, Then, the main valve body 2 is opened. When the valve is opened, the main valve body 2 is first closed with the sub-valve element 4 opened, and the opening and closing device A of the rotary valve V with a sub-valve that closes the sub-valve body 4 is continued. A main screw shaft 11 for the main valve and a sub screw shaft 12 for the sub-valve in a direction orthogonal to the main valve shaft 3 are arranged in parallel on a casing 10 fixed to the valve box 1 so as to be rotatable around their respective axes. The slide blocks 18 and 19 are screwed into the two screw shafts 11 and 12 movably in the axial direction, respectively.
The two shafts 18 and 19 are connected to the operating shaft 16 provided on the main clutch 31 via a main clutch 31 and a sub-clutch 32, respectively.
1 and 32 are selectively turned on and off so that the two screw shafts 11 and 1
2, the slide blocks 18 and 19 are selectively moved by the rotation, and the main / sub valve shafts 3 and 5 are rotated by the movement to rotate the main block 2 and the sub valve 4 , And selectively rotates the auxiliary clutch 32 from on to off and to the main clutch.
When the switch 31 is turned on, the sub slide block 19 is turned on.
Of the sub-clutch 32
From off to on and from on to off of the main clutch 31
Movement of the main slide block 18 when the main valve is completely closed
An opening and closing device for a rotary valve with a sub-valve.