JPH09303608A - Circumferential array valve driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate a circumferential array valve uniformly by opening/closing a valve element to an interlocking link ring driven by a servo motor and turned along a fluid chamber outer peripheral surface through a link device, in the driving device of the circumferential array valve for leading a fluid while opening/closing an opening port such as a steam governing valve fully. SOLUTION: When a servo motor 20 is driven and a cylinder shaft 22 is pushed out, an interlocking link ring 10 is pushed in a circumferential direction, guided to a guide bracket 11, and moved along the outer peripheral surface of a steam chamber outer peripheral wall 6. The interlocking link ring 10 and a link device 14 installed between the ring 10 and other end side of a valve shaft 8 projected from the steam chamber outer peripheral wall 6 outward, are operated, and the valve shaft 8 is moved in the outer diameter direction of the steam chamber 5, namely, in a direction lifted up from a valve seat 4. A valve element 7 fixed on one end side of the valve shaft 8 is removed to a direction slipped off from the valve seat 4, an opening arranged in a circumferential direction is opened to the outer peripheral wall 2 of a nozzle chamber 1, and steam led into the steam chamber 5 is ejected to the nozzle chamber 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle chamber, which is disposed upstream of a nozzle in the circumferential direction, and which introduces steam into a nozzle chamber which supplies steam to the annularly arranged nozzle. The outer periphery of the nozzle chamber, such as a steam control valve, is designed to open and close multiple openings on the outer periphery of the nozzle chamber so that the steam supplied to the outside of the nozzle chamber is ejected from each of the openings into the nozzle chamber. The present invention relates to a circumferentially arrayed valve drive device for simultaneously opening and closing a plurality of openings arranged in the circumferential direction so as to introduce the outer fluid evenly into the inside from the respective openings.

[0002]

2. Description of the Related Art A high-pressure fluid introduced into a fluid chamber formed on the outer periphery of a cylindrical body is jetted into the inside of the cylindrical body from an opening provided on the outer peripheral surface of the cylindrical body in the circumferential direction. There is a nozzle room such as a steam turbine. like this,
Among the nozzle chambers, the nozzle chamber used for the steam turbine is divided into multiple groups in the circumferential direction, and each steam control valve is provided for each group, and the full load and partial load of the steam turbine are provided. Regardless of whether the steam is evenly distributed to each opening,
The loss due to the uneven flow of steam in the nozzle chamber is avoided.

FIG. 4 is an assembly sectional view of such a steam control valve, which has been conventionally used. As shown in the figure, a casing 0 that integrally forms the upper half of the turbine casing
1, a plurality of valve seats 02 are arranged in the horizontal direction, and a steam control valve 03 (valve body) that abuts on the valve seats 02 to open and close the steam flow path allows the steam chamber A to be connected to the inside of the casing 01. A nozzle chamber B arranged in the circumferential direction is formed. In other words, the steam control valve 03 that partitions the nozzle chamber B arranged in the circumferential direction from the steam chamber A is arranged in the circumferential direction.

A valve rod 04 (valve shaft) having each steam control valve 03 fixed to its lower end is allowed to freely penetrate into one horizontal plate 05 called a valve lift plate, and the horizontal plate 05 is connected to two rods. The lower end of 06 is connected and supported.
Further, the upper end of the rod 06 is inserted through a steam chamber lid 07 that closes the upper end of the casing 01, taken out of the steam chamber lid 07, and a single unit not shown in the figure via a link mechanism 08. The rod 06 is moved up and down by the drive of the steam control valve servomotor according to the load of the steam turbine.

Corresponding to the rise of the horizontal plate 05 due to the rise of the rod 06, each steam control valve 03 fixed to the tip of each valve rod 04 having a different length is the shorter one of the fixed valve rod 04. The steam introduced into the steam chamber A sequentially flows into the nozzle chamber B in the direction of the arrow and is supplied to the turbine through a nozzle annularly arranged on the inner circumference of the nozzle chamber B. . Further, in response to the lowered rod 06, the steam control valve 03 is sequentially closed from the longer side of the fixed valve rod 04, and the supply of steam from the steam chamber A to the nozzle chamber B is cut off.

In the figure, an example is shown in which steam is supplied only from the upper half of the turbine casing, but the same steam chamber A and nozzle chamber B are also provided in the lower half of the turbine casing, and the above-mentioned rod is used. The rod provided corresponding to 06 is interlocked with the ascending of the rod 06, and is lowered, so that the steam control valve 03
Accordingly, the steam control valve provided in the lower half of the turbine casing can be opened so that the steam is injected from the entire circumference.

However, such a steam control valve 03
In the circumferentially arrayed valve drive device for controlling the steam flow rate to be supplied to the turbine by driving the steam control valve 03, linear movement of the rod 06 that radially operates the steam control valve 03 via the horizontal plate 05, and the steam chamber cover 07. Since the link mechanism provided on the outside is used for opening and closing, there is a restriction on the installation space for these, and especially when opening and closing a large-diameter steam control valve using a large drive device, the installation space cannot be secured. The problem occurs.

Further, due to the restrictions on the arrangement of the link mechanism, the rod 06, the horizontal plate 05, the valve rod 04, etc. for transmitting the driving force from the drive device such as the steam control valve servo motor to the steam control valve,
Steam control valve 03 arranged on the outer circumference of the nozzle chamber B on the circumference
It may be difficult to operate the engine evenly or in response to the load of the steam turbine.

[0009]

DISCLOSURE OF THE INVENTION The present invention solves the problems that have occurred in the conventional circumferentially arrayed valve drive device, such as the steam control valve 03 described above, and therefore is compact even if it is a large drive device. The valves arranged on the circumference can be operated evenly without restriction on the arrangement space, and the operation of the arranged valves can be performed accurately according to the load. An object is to provide a circumferentially arrayed valve drive device that can be controlled.

[0010]

Therefore, the circumferentially arrayed valve drive device of the present invention has the following means.

(1) An outer peripheral wall of a nozzle chamber in which a valve seat having an opening for ejecting a fluid is circumferentially arranged on the outer periphery, and a valve body which abuts on the valve seat to open and close the opening are provided at one end side. It is divided by the outer peripheral wall that penetrates the other end of the connected valve shaft (valve rod),
An annular fluid chamber was provided for introducing the fluid ejected from the opening. The nozzle chamber may be formed by a partial arc of a cylinder.

(2) By driving a servomotor which is arranged outside the outer peripheral wall of the annular fluid chamber and has a cylinder shaft connected to the outer peripheral end, the circumference of the fluid chamber is moved along the outer peripheral wall of the fluid chamber. A rotating plate-shaped interlocking link ring is provided. The interlocking link ring preferably has a plurality of guide brackets projecting from the outer peripheral surface of the fluid chamber and slidably supported by the guide brackets. Further, it is desirable that the cylinder shaft of the servomotor and the interlocking link ring are connected to each other by forming a tab on the outer peripheral edge of the interlocking link ring and connecting the cylinder shaft to the tab by a pin or the like.

(3) The servo is interposed between the other end of the valve shaft that penetrates the outer peripheral wall of the fluid chamber and projects to the outside of the fluid chamber, and the interlocking link ring that rotates around the fluid chamber. When the interlocking link ring is rotated around the fluid chamber by the motor, the valve element connected to one end of the valve shaft moves in the radial direction of the fluid chamber and opens on the inner peripheral side of the fluid chamber. A link device is provided which is arranged in the circumferential direction and moves back and forth toward a valve seat provided in the opening to convert it into a linear motion that opens and closes the opening and transmits it to the other end of the valve shaft. . The fixed pivot portion required for the link device is provided with a bracket protruding from the outer peripheral surface of the fluid chamber, and the link device has an operating path on the other end side of the valve shaft protruding outside the fluid chamber. It is desirable to provide it so that it is connected to the other end of the valve shaft by interposing a link connecting plate or the like.

In the circumferentially arrayed valve driving device of the present invention, when the servomotor is driven by the above-mentioned means to push out the cylinder shaft, the interlocking link ring is pushed in the circumferential direction and guided by the guide bracket or the like so as to move the fluid chamber. Outer wall Moves along the outer surface.
By the rotation of the interlocking link ring, the link device mounted between the interlocking link ring and the other end side of the valve shaft protruding outward from the outer peripheral wall of the fluid chamber also operates, causing the valve shaft to move in an annular fluid. The valve body, which is operated in the outer diameter direction of the chamber, that is, in the direction of lifting, is fixed to one end side of the valve shaft that operates in the fluid chamber, moves in the direction to separate from the valve seat provided on the outer peripheral wall of the nozzle chamber, and A circumferentially arranged opening is opened in the outer peripheral wall of the nozzle chamber provided with the seat.

Further, if the cylinder shaft of the servomotor is reversely operated, the valve shaft is actuated in the direction of the inner diameter of the fluid chamber, that is, in the direction of pushing it down, the valve body moves in the direction of abutting against the valve seat, and the opening is closed. To do.

In this way, the valve elements arranged in the circumference can be uniformly operated by the operation of the servomotor by the interlocking mechanism including the interlocking link ring and the link device. I can. As a result, loss due to uneven flow in the nozzle chamber does not occur, and opening / closing control of the circumferentially arrayed valve corresponding to an external load can be easily performed.

Further, since these interlocking mechanisms can be arranged in an annular shape in accordance with the shape of the fluid chamber formed in an annular shape, a large driving device, such as a large diameter steam control valve,
Also, even when the interlocking mechanism for transmitting a large driving force is required, the device can be made compact, so that there is no problem in the arrangement space.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a circumferentially arrayed valve driving device of the present invention will be described below with reference to the drawings. 1 is a partial perspective view showing a partial cross-section of a steam control valve as a first embodiment of a circumferentially arrayed valve drive device of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. It is a side view.

An opening 3 is provided in the circumferential direction, and a valve seat 4 is provided in the opening 3.
The steam chamber 5 as an annular fluid chamber is arranged so as to surround the outer periphery of the nozzle chamber 1 defined inside the cylindrical outer wall 2 of the nozzle chamber. The steam chamber outer peripheral wall 6 that defines the outer peripheral side of the steam chamber 5 has one end that abuts the valve seat 4 to close the opening 3 and separates from the valve seat 4 to open the opening. The other end side of the valve shaft 8 to which is fixed is provided so as to penetrate therethrough. The other end of the valve shaft 8 penetrates a seal box 9 provided on the outer peripheral surface of the steam chamber outer peripheral wall 6 and projects to the outside of the steam chamber 5.

An annular plate-shaped interlocking link ring 10 is concentrically arranged outside the steam chamber outer peripheral wall 6, and is supported by a guide bracket 11 projecting from the outer peripheral surface of the steam chamber outer peripheral wall 6. It rotates along the outer peripheral surface of the outer peripheral wall 6 of the steam chamber. Bracket 12 protruding from the outer peripheral edge of interlocking link ring 10
And the link connecting plate 13 pivotally attached to the other end side of the valve shaft 8 protruding to the outside of the steam chamber 5, the operation path of the valve shaft 8 operating in the radial direction of the steam chamber 5 is avoided. Thus, the link device 14 is formed.

That is, when the operating rod 15 whose one end is pivotally attached to the bracket 12 moves in the direction of arrow A as the interlocking link ring 10 rotates, one end of the operating rod 15 pivots at the other end. The attached V-shaped rod 16 is the outer peripheral wall 6 of the steam.
On the bracket 18 protruding from the outer peripheral surface of the
It rotates in the direction of arrow B around the base end pivotally attached at 7. By the rotation of the V-shaped rod 16, the V-shaped rod 16
A link connecting plate 13 having one end pivotally attached to the other end of
By moving in the direction of arrow C, the valve shaft 8 is moved to the fluid chamber 5
As shown by the arrow D, the link device 14 is arranged so as to move up and down in the radial direction.

Further, an ear 21 connected to the servomotor 20 is provided on the outer peripheral edge of the interlocking link ring 10, and the cylinder shaft 22 of the servomotor 20 and the ear 21 are connected by a pin 19 or the like. The interlocking link ring 10 is rotated along the outer peripheral surface of the steam chamber outer peripheral wall 6 by the driving force of the servomotor 20.

Since the circumferentially arrayed valve drive device of the present embodiment is configured as described above, when the servomotor 20 is driven to push out the cylinder shaft 22, the cylinder shaft 22 and the ears provided on the outer peripheral edge are driven. The interlocking link ring 10 pivotally attached at 21 is
It is pushed in the circumferential direction, guided by the guide bracket 11, and moves along the outer peripheral surface of the steam chamber outer peripheral wall 6. By the rotation of the interlocking link ring 10, the interlocking link ring 10 and the steam chamber outer peripheral wall 6
The link device 14 mounted between the valve shaft 8 and the other end of the valve shaft 8 which is projected outward from the valve shaft 8 is operated to operate the valve shaft 8 in the radial direction of the steam chamber 5, that is, in the direction of lifting from the valve seat 4. The valve body 7 fixed to one end side of the valve shaft 8 moves in a direction to separate from the valve seat 4, and an opening circumferentially arranged on the outer peripheral wall 2 of the nozzle chamber 1 in which the valve seat 4 is provided. 5 is opened and the steam introduced into the steam chamber 5 is ejected into the nozzle chamber 1.

Further, the cylinder shaft 22 of the servomotor 20
If the reverse operation is applied to the valve shaft 8, the valve shaft 8 is actuated in the inner diameter direction of the steam chamber 5, that is, in the direction in which the valve body 7 is pushed down toward the valve seat 4, and the valve body 7 contacts the valve seat 4. By closing the opening 3, the steam flowing from the steam chamber 5 into the nozzle chamber 1 is blocked. Further, by controlling the operation of the cylinder shaft 22, it is possible to set the opening degree of the opening 3 to an arbitrary size and control the flow rate of steam flowing from the steam chamber 5 into the nozzle chamber 1. In this way, the valve elements 7 arranged in the circumferential direction are made uniform by the operation of the servomotor 20 by the interlocking mechanism including the interlocking link ring 10 and the link device 14. Can be activated.

Thus, the loss due to the uneven flow in the nozzle chamber 1 caused by the uneven opening of the opening 3 can be prevented, and the opening / closing control of the valve elements 7 arranged in the circumferential direction corresponding to the external load can be prevented. However, it can be done easily and accurately.

Further, these interlocking mechanisms can be arranged in an annular shape in accordance with the outer peripheral shape of the steam chamber formed in an annular shape, so that a large driving force can be provided like a large-diameter steam control valve. Even when a required steam control valve servomotor and an interlocking mechanism for transmitting a large driving force are required, the size can be reduced, and the problem of the arrangement space that occurs in the conventional steam control valve occurs. There is no such thing.

In the above-described embodiment, the steam control valve is described as an example, but the present invention is not limited to such a steam turbine application. Further, the fluid ejected from the opening is not limited to the one ejected from the fluid chamber to the nozzle chamber, and conversely ejected from the nozzle chamber provided on the inner peripheral side to the fluid chamber on the outer peripheral side. It is also possible to do so.

[0028]

As described above, according to the circumferentially arrayed valve drive device of the present invention, all the arrayed valves arrayed in the circumferential direction by one operation of the servomotor are constituted by the structure shown in the claims. Can be operated evenly. Further, since the interlocking mechanism can be arranged along the outer shape of the gas chamber, there is no restriction on the arrangement space. Therefore, even a circumferentially arrayed valve drive device that requires a large driving force can be made compact.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a steam control valve as a first embodiment of a circumferentially arrayed valve drive device of the present invention, showing a partially broken cross section;

FIG. 2 is a front view of the circumferentially arrayed valve drive device shown in FIG.

3 is a view showing a side surface of the circumferentially arrayed valve drive device shown in FIG. 2, FIG. 3 (a) is a side view taken along the line AA in FIG. 2, and FIG. A side view at BB,

FIG. 4 is an assembled sectional view around a conventional steam control valve.

[Explanation of symbols]

 1 Nozzle Chamber 2 Nozzle Chamber Outer Wall 3 Opening 4 Valve Seat 5 Steam Chamber as Fluid Chamber 6 Steam Chamber Outer Wall 7 Valve Disc 8 Valve Shaft 9 Seal Box 10 Interlocking Link Ring 11 Guide Bracket 12 (Link Device Linkage) Bracket 13 Link Connection Plate 14 Link device 15 Actuating rod that constitutes the link device 16 V-shaped rod that constitutes the link device 17 (V-shaped rod pivotally mounted) pivot pin 18 (V-shaped rod pivotally mounted) bracket 19 (cylinder shaft pivotally mounted) pivotal Pin 20 Servo motor 21 Ear 22 Cylinder shaft

Claims (1)

[Claims] 1. A circumferential array valve that opens and closes the opening by advancing and retracting a valve body from the outer peripheral side of a nozzle chamber in which a valve seat provided in an opening for ejecting a fluid is circumferentially arranged. In the drive device, an annular fluid chamber formed on the outer periphery of the nozzle chamber, the other end side of the valve shaft connecting the valve element to one end side penetrates the outer peripheral wall, and introduces a fluid to be ejected from the opening. , An interlocking link ring which is disposed on the outer periphery of the fluid chamber and is driven by a servomotor having an outer peripheral end connected to a cylinder shaft and which rotates along the outer peripheral surface of the fluid chamber; A link device is provided between the other end of the protruding valve shaft and the interlocking link ring, and provided with a link device for advancing and retracting the valve body to and from the valve seat by rotation of the interlocking link ring. Circular array valve drive device.