JP2000028008A - Double shaft rotating device by one operating shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double shaft rotating device by one operating shaft capable of automatically rotating double shafts based on a proper operating order without considering the operating order and only if a rotating direction of the one operating shaft is specified. SOLUTION: By rotating one operating shaft 40 in a valve opening direction R1 and rotating an auxiliary shaft side worm gear 32 and a shaft 14 by rotation of an auxiliary shaft side worm shaft 34 and a worm 35, an auxiliary valve element 3 is opened. By revolving a pin 39 provided on a female screw block 37 advancing along the operating shaft 40 by making the pin 39 interfere with a slit 42 of a main shaft side revolving arm 31, a main valve element 2 is opened. By rotating the operating shaft 40 in a valve closing direction and revolving the pin 39 in an opposite direction by making the pin 39 interfere with the slit 42 of the main shaft side revolving arm 31, the main valve element 2 is closed. Next, the auxiliary shaft side worm gear 32 and the shaft 14 are reversely rotated by reverse rotation of the auxiliary shaft side worm shaft 34 and the worm 35, and the auxiliary valve element 3 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-shaft rotary device having one operation shaft suitable for an opening / closing device for a butterfly valve with a built-in auxiliary valve.

[0002]

2. Description of the Related Art As shown in FIGS. 10 to 12, a butterfly valve with a built-in sub-valve includes a valve box 1, a main valve body 2 housed in the valve box 1 so as to be openable and closable, and a main valve body 2. A sub-valve element 3 is provided so as to be openable and closable. An upper valve rod 4 and a lower valve rod 5 are fixed to the main valve body 2. The upper valve stem 4 is a cylindrical member provided with a through hole 6 in the direction of the axis C, and is rotatably and air-tightly supported around the axis C by the upper shaft support 7 of the valve box 1 so as to be above the upper shaft support 7. It is protruding. Lower valve stem 5 is valve box 1
The main valve body 2 is rotatably and air-tightly supported around an axis C by a lower shaft support portion 8, and the main valve body 2 is rotated by the rotation of the upper valve stem 4 and the lower valve stem 5 in the forward and reverse directions around the axis C. 1
Open and close the passage.

An upper valve rod 9 and a lower valve rod 10 are fixed to the sub-valve element 3, and the upper valve rod 9 is rotatable about an axis C by an upper shaft support 12 of an auxiliary valve box 11 provided on the main valve element 2. And is airtightly supported and protrudes above the upper shaft support 12. The lower valve stem 10 is rotatably and air-tightly supported around an axis C by a lower shaft support portion 13 of the sub-valve case 11.

A shaft 14 having an upper end protruding above the upper valve rod 4 is inserted through a through hole 6 provided in the upper valve rod 4 of the main valve body 2 in the direction of the axis C so as to be rotatable about the axis C. , This axis 14
And the upper end of the upper valve rod 9 of the sub-valve 3 are connected to each other via a coupling 15 so as to be able to rotate simultaneously.

[0005] A biaxial rotating device 17 is mounted on the upper shaft support 7 of the valve box 1 via a stand 16. The two-axis rotating device 17 uses the two operation shafts 18 and 19 to rotate the main valve body 2.
A first gear case 20 having an axis concentric with the axis C, and a first gear case 20 having an axis concentric with the axis C. A lower end of the first gear case 20 is fixed to the stand 16, and an upper end opening of the first gear case 20 is detachably closed by a cover 22.

The one operating shaft 18 is connected to the upper valve rod 4 of the main valve body 2.
To rotate in the forward and reverse directions around the axis C,
As shown in FIGS. 13 and 14, the second gear case 21
Is rotatably and airtightly supported around an axis C1 by a shaft support portion 23 provided at one end thereof, and protrudes above the shaft support portion 23. The rotation of one operation shaft 18 around the axis C1 is performed by a bevel pinion 24A, It is transmitted to a horizontal worm shaft 25 via a gear train 24 such as a bevel gear 24B, a pinion 24C, a spur gear 24D, and the like.
Is rotated via a worm 26 provided on the worm shaft 25 through a worm wheel 27 having an axis concentric with the axis C.
Is transmitted to The worm wheel 27 is fixed to a wheel boss 28 rotatably supported around the axis C by the first gear case 20 and the cover 22, and a central hole 28 </ b> A of the wheel boss 28 is provided at an upper end of the upper valve rod 4 of the main valve body 2. And are coupled so as to be simultaneously rotatable by, for example, a key (not shown).

The other operation shaft 19 is for rotating the upper valve stem 9 of the sub-valve 3 in the forward and reverse directions about the axis C via the shaft 14 and the coupling 15, as shown in FIG. , Which is rotatably and air-tightly supported around an axis C by a stem cover 29 which detachably closes a center hole 22A of the cover 22 and protrudes above the stem cover 29, and is provided on the other operation shaft 19. The upper end of the shaft 14 is fitted into the blind through-hole 30 in the direction of the axis C, and is coupled to be rotatable simultaneously by, for example, a taper pin (not shown).

In the above construction, the main valve body 2 and the sub-valve element 3 are fully opened from the valve-closing state of the sub-valve built-in type butterfly valve in which the main valve element 2 and the sub-valve element 3 are fully closed. The procedure for obtaining the open state of the butterfly valve will be described.

First, the other operation shaft 19 is rotated in the valve opening direction (for example, counterclockwise on the projection plane). This rotation is transmitted to the upper valve rod 9 of the sub-valve 3 via the shaft 14 and the coupling 15, and simultaneously rotates the upper valve rod 9, the sub-valve 3 and the lower valve rod 10 in the valve opening direction. The sub-valve 3 can be fully opened.

When the differential pressure between the upstream side and the downstream side of the valve box 1 becomes small due to the full opening of the sub-valve element 3, the one operating shaft 1
8 is the valve opening direction (for example, counterclockwise on the projection plane)
Rotate to. This rotation is transmitted to the upper valve stem 4 of the main valve body 2 through a gear train 24 such as a bevel pinion 24A, a bevel gear 24B, a pinion 24C, a spur gear 24D, a worm shaft 25, a worm 26, a worm wheel 27, and a wheel boss 28. By rotating the upper valve stem 4, the main valve stem 2 and the lower valve stem 5 simultaneously in the valve opening direction, the main valve stem 2 can be fully opened.

Next, the main valve body 2 and the sub-valve element 3 are fully closed from the valve-open state of the sub-valve-incorporated type butterfly valve in which the main valve element 2 and the sub-valve element 3 are fully opened. The procedure for obtaining the closed state of the butterfly valve will be described.

First, one operation shaft 18 is rotated in a valve closing direction (for example, clockwise on a projection plane). This rotation is transmitted to the upper valve stem 4 of the main valve body 2 through a gear train 24 such as a bevel pinion 24A, a bevel gear 24B, a pinion 24C, a spur gear 24D, a worm shaft 25, a worm 26, a worm wheel 27, and a wheel boss 28. ,
The upper valve stem 4, the main valve body 2 and the lower valve stem 5 can be simultaneously rotated in the valve closing direction to fully close the main valve body 2.

After the main valve body 2 is fully closed, the passage of fluid from the upstream side to the downstream side of the valve box 1 is greatly restricted, and then the other operation shaft 19 is moved in the valve closing direction (for example, clockwise on the projection plane). Around). This rotation is transmitted to the upper valve rod 9 of the sub-valve 3 via the shaft 14 and the coupling 15, and simultaneously rotates the upper valve rod 9, the sub-valve 3 and the lower valve rod 10 in the valve closing direction, The sub-valve 3 can be fully closed.

As described above, in the butterfly valve with a built-in sub-valve, the operation order of the main valve body 2 and the sub-valve body 3 from the valve closed state to the valve open state is as follows. Opening of the sub-valve body 3 by rotating the other operation shaft 19,. The operation of the main valve 2 and the sub-valve 3 from the valve open state to the valve closed state is performed by opening the valve of the main valve body 2 by rotating one of the operation shafts 18. The valve closing of the main valve body 2 by the rotation operation of one operation shaft 18,. This is performed by closing the valve of the sub-valve body 3 by rotating the other operation shaft 19.

[0015]

For this reason, in a conventional two-shaft rotating device having two operating shafts, two operating shafts are specified each time the main valve and the sub-valve are opened and closed. Must be rotated in the valve opening or valve closing direction in the order described, which has the disadvantage of cumbersome operation, and improper operation sequence significantly increases the operating force at the time of valve opening and valve closing, It has a drawback that smooth opening and closing of the valve are hindered.

Accordingly, the present invention provides a method of automatically rotating two axes based on an appropriate operation order simply by specifying the rotation direction of one operation axis without considering the operation order. It is an object of the present invention to provide a two-axis rotating device using one operation shaft, which can facilitate the operation and can avoid an erroneous operation sequence.

[0017]

In order to achieve the above object, a two-axis rotating device with one operating shaft according to the present invention is provided.
A main shaft and a sub-shaft inserted into the main shaft along the main shaft are rotated in a specified order in the normal and reverse directions around the main shaft by rotation of one operation shaft. A shaft rotating device, comprising: a main shaft side swing arm provided so as to be able to rotate simultaneously with the main shaft; and a counter shaft side worm gear provided so as to be simultaneously rotatable on the sub shaft so as to face the main shaft side swing arm. And an rotatable support having an axis intersecting the axes of the main shaft and the countershaft, and one rotatable support shaft having an external thread provided on an outer periphery thereof, and rotatably supported in parallel with the one control shaft. A countershaft-side worm shaft provided with a worm meshing with the countershaft-side worm gear so as to be simultaneously rotatable; and a rotation transmission mechanism for transmitting rotation of the one operation shaft to the countershaft-side worm shaft; Outside the one operating axis A female screw member having a female screw portion to be screwed into the male screw of the female screw member that moves in the axial direction of the one operation shaft following the first rotation direction and the second rotation direction of one operation shaft; The main shaft side revolving arm is provided on the main spindle side revolving arm during the movement from the advance start position to the middle of the advance of the female screw piece that follows the rotation of the one operation shaft in the first rotational direction. While not interfering with one of the connecting portions, while moving from the middle of the advancement of the female screw piece to the forward end position, it interferes with the one connecting portion to turn the main valve side turning arm, and simultaneously rotates the main shaft. During the movement from the retreat start position of the female screw piece to the middle of the retreat following the rotation of the one operation shaft in the second rotational direction, the main valve side revolving arm is reversely rotated by interfering with the one connecting portion. And at the same time The causes reverse rotation, while moving from the middle retraction of the internal thread piece to the retracted end position is characterized by the other interlocking portion do not interfere with the interlocking portion of the one is provided.

According to the present invention, by rotating one operation shaft in the first rotation direction, the worm shaft on the auxiliary shaft side rotates via the rotation transmission mechanism. The rotation of the counter shaft side worm shaft rotates the counter shaft side worm gear meshing with the worm to rotate the counter shaft at the same time, and the female screw top advances. While the female screw top is moving from the forward movement start position to the middle of the forward movement, the one connecting part does not interfere with the other connecting part, so that the main spindle side turning arm and the main shaft are stopped.

By continuing rotation of one operation shaft in the first rotation direction, the sub shaft is continuously rotated,
While the female screw top moves from the middle of the advance to the advance end position, one of the connecting portions interferes with the other connecting portion, so that the main shaft side turning arm can be turned and the main shaft can be rotated at the same time.

In the above state, one operation shaft is
By rotating in the rotation direction, the counter shaft-side worm shaft rotates in the reverse direction via the rotation transmission mechanism. The reverse rotation of the countershaft worm shaft causes the countershaft worm gear meshing with the worm to rotate in the reverse direction, causing the countershaft to simultaneously rotate in the reverse direction, and the female screw piece to retract. While the female screw top is moving from the retreat start position to the middle of retreat, one of the connecting parts interferes with the other connecting part, causing the main shaft side swivel arm to turn in the reverse direction, and at the same time, reverse the main shaft to return to the original position. Can be done.

Further, by continuing to rotate the one operation shaft in the second rotation direction, the sub shaft is continuously rotated in the reverse direction and returns to the original position. While the female screw piece is being moved from the middle of retreat to the retreat end position, the one connecting portion does not interfere with the other connecting portion, so that the main spindle-side turning arm and the main shaft are stopped.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, in which the present invention is applied to an opening / closing device for a butterfly valve with a built-in sub-valve in the same manner as in the prior art. Therefore, the structure of the valve box 1, the main valve body 2, the sub-valve body 3, the upper valve rods 4, 9, the lower valve rods 5, 10, the shaft 14 and the like are the same as those of the conventional example. The same or corresponding parts as those in the conventional example of FIGS. 10 to 14 are denoted by the same reference numerals.

FIG. 1 is a plan view showing an embodiment of the present invention when a main valve body and a sub-valve element are closed, FIG. 2 is a plan view showing a state in which only a sub-valve element is opened, and FIG. 2 is a cross-sectional view taken along the line AA, and FIG. 4 is a plan view of the main valve body and the sub-valve body when the valves are opened. In these figures, the two-axis rotating device 17 has a main shaft side revolving arm 31, a countershaft side worm gear 32, and an axis that intersects the axis of the upper valve rod 4 and the shaft 14, and is rotatable on a casing 41. It is supported and has an external thread 40
A provided with one operation shaft 40.

The spindle-side swivel arm 31 has a boss-shaped base 3.
1A and a pair of arms 31B, 31B extending radially outward from the boss-shaped base 31A and facing up and down, and the upper end of the upper valve rod 4 in the main valve body 2 is provided with a boss-shaped base. The keys 33A are fitted to each other so as to be rotatable at the same time. The upper end of the shaft 14 is fitted to the countershaft-side worm gear 32 and connected to the countershaft worm gear 32 by a key 33B so as to be able to rotate simultaneously.

The casing 41 has a worm shaft 3 on the counter shaft side.
4 is rotatably supported in parallel with one operating shaft 40, and a worm 35 meshing with the worm gear 32 is fixedly mounted on the worm shaft 34 so as to be able to rotate simultaneously. Also, one operation shaft 40 and the counter shaft side worm shaft 3
4 is configured to be able to simultaneously rotate the rotation transmission mechanism 36 shown in FIG. The rotation transmission mechanism 36
Has a drive gear 36A fixed to one operation shaft 40, an intermediate gear 36B, and a driven gear 36C fixed to the counter shaft side worm shaft 34.

A female screw top 37 having a female screw portion 37A screwed to a male screw 40A on the outer periphery of one operation shaft 40 is provided. A guide 38 provided in parallel with one operation shaft 40 slidably penetrates one end of the female screw top 37. Therefore, the female screw top 37 moves forward and backward in the axial direction of one operation shaft 40 following the rotation of one operation shaft 40.

On the other hand, the female screw portion 3 in the female screw top 37
One connecting portion 39 which is located on both sides of the upper and lower sides of the formation portion of 7A and is formed by a pair of pins projecting vertically.
Is provided. Also, a pair of upper and lower arm portions 31B, 31B of the main spindle side turning arm 31 are provided with:
The other connecting portion 42 formed of a slit that slidably penetrates one connecting portion 39 is provided to penetrate in the thickness direction. The other connecting portion 42 is connected to the spindle-side swing arm 3.
A first portion 42A extending straight from the tip of 1 to the middle,
From the rear end of the first portion 42A, the main shaft side swing arm 31
And a second portion 42B that bends toward the center of the base portion. When the main valve body 2 and the sub-valve body 3 shown in FIGS. Part 4
One connecting portion 39 is located at the tip of 2A.

A procedure for fully opening the main valve body 2 and the sub-valve body 3 from the valve-closed state of the butterfly valve with a built-in sub-valve in which the main valve body 2 and the sub-valve body 3 are fully closed will be described. .

The main valve body 2 and the auxiliary valve body 3 shown in FIGS.
Is fully closed, one connecting portion 39 is located at the tip of the first portion 42A in the other connecting portion 42,
The self-locking function for restraining the turning of the main shaft side turning arm 31 is exerted to prevent the main valve body 2 from swinging due to a fluid load. The worm gear 32 on the countershaft side has a worm 35
Therefore, the sub-valve 3 does not swing due to the load of the fluid.

In this state, one operating shaft 40 is moved in the valve opening direction R.
When rotated to 1, this rotation is transmitted to the counter shaft side worm shaft 34 via the rotation transmission mechanism 36, and the counter shaft side worm shaft 34 rotates. The rotation of the counter shaft-side worm shaft 34 rotates the counter shaft-side worm gear 32 meshing with the worm 35 by 90 degrees in the RX1 direction, and rotates the shaft 14 around the shaft by 90 degrees.
And the sub-valve 3 is opened as shown in FIG. Said 1
The female screw top 37 advances in the direction of arrow X1 by the rotation of the two operation shafts 40 in the valve opening direction R1. While the female screw top 37 is moving from the forward start position in FIG. 1 to the position in FIG. 2, one connecting portion 39 is connected to the first connecting portion 42 in the other connecting portion 42.
It moves forward along the part 42A. That is, since the other connecting portion 42 does not interfere with the one connecting portion 39, the main valve-side turning arm 31 and the upper valve rod 4 are stopped. Moreover,
The first portion 42A and the second portion 4 in the other connecting portion 42
Since one connecting portion 39 is located at the boundary with 2B, and exhibits a self-locking function of restraining the turning of the main shaft side turning arm 31, the swing of the main valve body 2 due to the load of the fluid can be prevented. it can. Further, since the auxiliary shaft side worm gear 32 is engaged with the worm 35, the auxiliary valve body 3 does not swing due to the load of the fluid.

When only the sub-valve 3 shown in FIGS. 2 and 7 is open, the valve opening direction R of one operating shaft 40 is
1 continues to rotate, the shaft 14 continues to rotate, and one connecting portion 39 interferes with the second portion 42B of the other connecting portion 42, causing the main shaft-side turning arm 31 to move as shown in FIG.
As shown by the imaginary line of, turn 45 degrees in the SR1 direction,
At the same time, by rotating the upper stem 4 around the axis 45 degrees,
As shown in FIG. 8, the main valve body 2 is opened to an intermediate opening degree. While the main shaft side turning arm 31 is turning 45 degrees in the SR1 direction, the counter shaft side worm gear 32 further moves 9 degrees in the RX1 direction.
By rotating the shaft 14 by 0 degrees, the shaft 14 is rotated by 90 degrees around the axis, and the sub-valve 3 is opened at an intermediate opening as shown in FIG. This state is based on the self-locking function and the countershaft side worm gear 3.
It is held by engaging the worm 2 with the worm 35.

When the rotation of one operating shaft 40 in the valve opening direction R1 is continued in a state where the main valve body 2 and the sub-valve body 3 shown in FIG. , Axis 1
4 continuously rotates, and one of the connecting portions 39 interferes with the second portion 42B of the other connecting portion 42, so that the main shaft side turning arm 31 is further turned by 45 degrees in the SR1 direction, and the valve shown in FIG. Reach the open end position. At the same time, the upper valve stem 4 rotates 45 degrees to open the main valve body 2 as shown in FIG. While the main shaft-side turning arm 31 is turned 45 degrees in the SR1 direction from the position of the phantom line in FIG. 2 to reach the valve opening end position shown in FIG. 4, the counter shaft-side worm gear 32 further moves 9 degrees in the RX1 direction.
By rotating 0 degrees, the sub-valve 3 is closed as shown in FIG. This state is maintained by the self-locking function and the engagement between the counter shaft side worm gear 32 and the worm 35.

On the other hand, when one operating shaft 40 is rotated in the valve closing direction R2 while the main valve body 2 shown in FIGS. 4 and 9 is open and the sub-valve body 3 is closed, This rotation is transmitted to the counter shaft side worm shaft 34 via the rotation transmission mechanism 36, and the counter shaft side worm shaft 34 rotates in the reverse direction. The reverse rotation of the countershaft-side worm shaft 34 causes the countershaft-side worm gear 32 meshing with the worm 35 to reversely rotate 90 degrees in the RX2 direction, thereby causing the shaft 14 to rotate in the reverse direction about the axis, and the sub-valve element 3 Open the valve at an intermediate opening as shown in FIG.
7 retreats in the arrow X2 direction. While the female screw top 37 is retracted from the retreat start position in FIG. 4 to the position indicated by the phantom line in FIG. 2, one connecting portion 39 interferes with the second portion 42 </ b> B in the other connecting portion 42. For this reason, the main shaft side turning arm 31 in FIG. 4 reversely turns 45 degrees in the SR2 direction to reach the position indicated by the phantom line in FIG. 2, and opens the main valve body 2 at the intermediate opening as shown in FIG. .

In a state where the main shaft side swing arm 31 reaches the position indicated by the phantom line in FIG. 2 and the main valve body 2 and the sub-valve body 3 are opened at an intermediate opening degree as shown in FIG. When the rotation of one operation shaft 40 in the valve closing direction R2 is continued, the reverse rotation of the counter shaft worm shaft 34 is continued, and the counter shaft worm gear 32 is further rotated 90 degrees in the RX2 direction, and the shaft 14 is rotated.
Is rotated in the reverse direction about the axis to open the sub-valve 3 as shown in FIG. 7, and the female screw top 37 is further retracted in the direction of the arrow X2. While the female screw top 37 is retracted from the position shown by the imaginary line in FIG.
Interfere with the second portion 42B of the other connecting portion 42. For this reason, the spindle-side swivel arm 3 shown by a virtual line in FIG.
1 further reversely turns 45 degrees in the direction of SR2 to reach the position shown by the solid line in FIG. 2, and closes the main valve body 2 as shown in FIG.

In the state where the main shaft side swing arm 31 reaches the position shown by the solid line in FIG. 2, and the main valve body 2 is closed and the sub-valve body 3 is open as shown in FIG. When the rotation of the two operating shafts 40 in the valve closing direction R2 is continued, the reverse rotation of the counter shaft side worm shaft 34 is continued, and the counter shaft side worm gear 32 is rotated.
Is further rotated in the direction RX2 by 90 degrees, the shaft 14 is rotated reversely around the axis, the sub-valve 3 is closed as shown in FIG. 6, and the female screw piece 37 is further retracted in the direction of arrow X2. While the female screw top 37 is retracted from the position shown by the solid line in FIG. 2 to the position shown in FIG. 1, one connecting portion 39 is moved backward along the first portion 42A of the other connecting portion 42, that is, one of the connecting portions 39 is moved backward. Since the other connecting portion 42 does not interfere with the connecting portion 39, the main valve-side turning arm 31 and the upper valve rod 4 are stopped. Further, as described above, since the self-locking function for restraining the turning of the main shaft side turning arm 31 is exhibited, the swing of the main valve body 2 due to the load of the fluid can be prevented.

As described above, by merely specifying the rotational direction of one operating shaft 40 without considering the opening / closing operation order of the main valve body 2 and the sub-valve body 3, the main valve body 2 and the sub-valve body 3 are automatically determined based on the opening / closing operation order. By rotating the two axes of the upper valve stem 9 of the sub-valve element 3 via the upper valve stem 4 and the shaft 14 of the valve element 2, the main valve element 2 and the sub-valve element 3 can be opened and closed in a specified order. Therefore, the main valve body 2 and the sub-valve body 3 are arranged like a conventional two-shaft rotating device having two operation shafts.
Each time the valve is opened and closed, the complicated operation of rotating the two operation axes in the specified direction in the valve opening or valve closing direction is not required, and the operation can be easily performed. No errors occur.

In the above-described embodiment, the two-axis rotating device with one operation shaft according to the present invention is applied to the opening / closing device of the butterfly valve with a built-in sub-valve. The present invention is not limited to only the opening and closing device for the butterfly valve, but can be applied to a device for rotating two members rotating around an axis in a specified order in a forward direction and a reverse direction.

[0038]

As described above, according to the present invention, the rotation direction of one operation shaft is specified only by specifying the rotation direction of one operation shaft without considering the opening / closing operation sequence of the main shaft and the sub shaft. The two axes can be rotated based on a simple opening / closing operation sequence. Therefore, as in a conventional two-axis rotating device having two operation axes, each time two axes are rotated, the two operation axes are specified in the specified order. This eliminates the need for a complicated operation of rotating in the forward or reverse direction, allows easy operation, and improves the reliability because no error occurs in the operation order.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main valve body and a sub-valve body when an embodiment of the present invention is closed.

FIG. 2 is a plan view showing a state where only a sub-valve is opened.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a plan view of the main valve element and the sub-valve element when the valve is opened.

FIG. 5 is a sectional view taken along line BB of FIG. 2;

FIG. 6 is an explanatory diagram showing a valve closed state of a main valve body and a sub valve body.

FIG. 7 is an explanatory view showing a valve open state of only a sub-valve element.

FIG. 8 is an explanatory view showing an intermediate opening state of a main valve body and a sub-valve body.

FIG. 9 is an explanatory diagram showing a valve open state of a main valve body.

FIG. 10 is a front view of a conventional example applied to a butterfly valve with a built-in sub-valve.

FIG. 11 is a plan view of FIG. 10;

FIG. 12 is a side view of FIG. 10;

FIG. 13 is an enlarged sectional view taken along the line DD in FIG. 11;

FIG. 14 is an enlarged sectional view taken along line EE of FIG. 11;

[Explanation of symbols]

 Reference Signs List 4 Upper valve shaft (main shaft) 14 shaft (sub shaft) 17 2-axis rotating device 31 main shaft side turning arm 32 sub shaft side worm gear 34 sub shaft side worm shaft 35 worm 36 rotation transmission mechanism 37 female screw top 37A female screw of female screw top 39 Pin (one connecting part) 40 Operating shaft 40A Male thread 42 Slit (the other connecting part) R1 Valve opening direction (first rotation direction) R2 Valve closing direction (second rotation direction)

Continued on the front page F-term (reference) 3H052 AA02 BA35 CA13 CC01 CD01 CD02 3H063 AA02 BB08 BB15 BB18 CC04 CC06 DB34 3J009 DA20 EA05 EA11 EA19 EA25 EA35 EA36 EA44 EB17 EC05 FA30

Claims (1)

[Claims] 1. A main shaft and a sub shaft inserted through the main shaft along an axis of the main shaft are specified in forward and reverse directions around an axis of the main shaft by rotation of one operation shaft. A two-axis rotating device for rotating in order, a main-axis turning arm provided so as to be simultaneously rotatable with the main shaft, and a second-axis rotating device being provided on the sub-shaft so as to be opposed to the main-axis turning arm. A countershaft-side worm gear, an operating shaft having an axis intersecting the axes of the main shaft and the countershaft, rotatably supported, and having an external thread provided on an outer periphery thereof; A counter shaft-side worm shaft rotatably supported and provided with a worm meshing with the counter shaft-side worm gear so as to be simultaneously rotatable; and transmitting the rotation of the one operation shaft to the counter shaft-side worm shaft. A rotation transmission mechanism; A female screw member having a female screw portion that is screwed into a male screw on the outer periphery of one operation shaft, and that moves forward and backward in the axial direction of the one operation shaft following the first rotation direction and the second rotation direction of one operation shaft; And one connecting portion provided on the female screw top, wherein the main spindle side turning arm is provided with a rotation start position from the advance start position of the female screw top that follows the rotation of the one operation shaft in the first rotation direction. Does not interfere with the one connecting portion during the movement, and interferes with the one connecting portion during the movement of the female screw piece from the middle of the advance to the advance end position to rotate the main valve side swing arm, and at the same time, While rotating the main shaft, the main valve interferes with the one connecting portion during the movement from the retreat start position of the female screw piece to the middle of the retreat, following the rotation of the one operation shaft in the second rotation direction. Reverse swivel arm And simultaneously rotating the main shaft in the reverse direction and providing the other connecting portion that does not interfere with the one connecting portion while the female screw piece is moving from the middle of retreat to the retreat end position. Two-axis rotating device with operating shaft.