JP2002097903A - Steam valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam valve which cuts off the steam to a steam turbine or controls the flow rate of steam and is free from such deficiency that steam valves require a large amount of space for their drive mechanisms because a stop valve and a spill valve are required to be separated from each other when operated and causes some problems in operation, maintenance and inspection, and integral type steam valves suffer from a large amount of pressure loss because a stop valve rod is arranged in a steam passage. SOLUTION: In the steam valve relating to the present invention, the stop valve and the spill valve are provided so as to be of integral structure with the steam valve, and the base end section of the steam valve is fixed to both of the two valves in their axial direction and has hollow structure which allows one of them to be inserted into the other one, and a drive mechanism is also provided to open and close the inlet of the steam passage by operating both of the valves which are connected to the base end section which are operated by the valve rod, the tip of which is projected outside from the same hole of a valve chamber. By this constitution, the tip sections of both valve rods can be managed to be projected outside from the valve chamber through the same hole, and the drive mechanism to activate both valves can be arranged at the same position above the valve chamber. This leads to cost reduction, the trend toward the compaction of the steam valve and the reduction of pressure loss in steam, which can improve maintenance ability and space saving.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam valve installed in a steam turbine, for example, for shutting off steam flowing into the steam turbine or controlling a steam flow in accordance with the operating condition of the steam turbine. The present invention relates to a steam valve having a steam stop valve (hereinafter simply referred to as a stop valve) for shutting off the flow of steam and a steam control valve (hereinafter simply referred to as a control valve) for adjusting the flow rate of steam inside the valve chamber.

[0002]

2. Description of the Related Art FIG. 7 shows a steam valve employed in a conventional steam turbine for controlling the flow rate of steam flowing into the steam turbine in accordance with the operating condition of the steam turbine or for shutting off steam S. It is a longitudinal cross-sectional view which shows the structure of the control valve and stop valve as an example.

[0003] As shown in the figure, a steam valve includes a stop valve 2 for shutting off steam S flowing into the steam turbine when the steam turbine trips, and a regulating valve 1 for controlling a steam flow according to the steam turbine load. Placed in different places in the valve room 3,
After the stop valve 2 is fully opened by resetting the steam turbine, by controlling the opening and closing of the control valve 1, the flow rate of steam passing through the steam valve is controlled, and the steam turbine is operated according to the load. I have to. Of these valves, a stop valve 2 that shuts off steam flowing into the steam turbine
Is fixed to the distal end of an arm 12 whose base end is fixed to a stop valve stem 5 disposed horizontally in the valve chamber 3, and the rotation of the stop valve stem 5 causes the opening indicated by a chain line. The stop valve 2 at the position is moved to a closed position for closing the inlet of the valve chamber 3 shown by a solid line, or moved from the closed position to the open position to open and close the valve chamber 3.

[0004] The opening and closing operation of the stop valve 2 is performed by a stop valve driving mechanism (not shown) using a hydraulic cylinder mechanism or the like which is connected via a stop valve valve rod 5 and is disposed outside the valve chamber 3. The rotation is performed by the rotation of the stop valve stem 5.
The control valve 1 that controls the flow rate of steam flowing into the steam turbine includes a control valve 1 that can form a gap through which steam S passes between the control valve 1 and a seat portion 6 formed in the valve chamber 3. The lower end is fixed to the center of the upper surface, is provided through the upper end of the valve chamber 3, and is moved up and down by an adjusting valve driving mechanism provided above the valve chamber 3. By adjusting the size of the gap between the inclined bottom surface and the inclined bottom surface formed at 1, the control valve valve rod 4 for controlling the inflow steam flow rate is provided.

The opening and closing operation of the control valve 1 is performed by a control valve drive mechanism (not shown) using a hydraulic cylinder mechanism or the like connected via a control valve rod 4 penetrating above the valve chamber 3. By driving the valve stem 4 up and down, the valve element 10 shown by a solid line
Is raised to the height indicated by the dashed line, or the valve body 10 indicated by the dashed line is lowered to a position that closes the seat portion 6 indicated by the solid line.

FIG. 8 shows a conventional steam turbine, which controls the flow rate of steam flowing into the steam turbine in accordance with the operating condition of the steam turbine, or has another steam valve for shutting off steam. It is a longitudinal cross-sectional view which shows the structure of the control valve and stop valve as an example. In the steam valve in this example, the control valve 1 is disposed above the valve seat portion 6, and the control valve 1
The stop valve 2 is disposed in an operation space formed below the valve and is operated, and the steam valve shown in FIG.
The stop valve 2 and the stop valve 2 are separated from each other, and are operated at separate and separated places in the valve chamber 3. On the other hand, in the steam valve shown in FIG. At the substantially same place of the valve chamber 3, along the axis of the valve chamber 3, they are integrally operated so as to be individually operated.

That is, the stop valve 2 of the steam valve shown in FIG. 8 has a lower surface peripheral portion abutting on the valve seat portion 6 of the valve chamber 3 to shut off the flow of steam from the inside of the valve chamber 3 to the steam turbine. 10 and a stop valve stem 5 having an upper end connected to the center of the lower end of the valve body 10 and penetrating through the lower end of the valve chamber 3 and projecting below the valve chamber 3. 5 is lowered until the peripheral portion of the lower surface of the valve body contacts the valve seat portion 6, or the peripheral portion of the lower surface of the valve body and the valve seat portion 6 are raised so that there is a sufficient gap for the steam to flow into the steam turbine. Let me
The valve chamber 3 is opened and closed.

The opening and closing operation of the stop valve 2 is performed by a stop valve driving mechanism using a hydraulic cylinder mechanism or the like (not shown), which is connected to the lower end of the stop valve valve rod 5 and installed below the valve chamber 3. This is performed by driving the stop valve stem 5 up and down. That is, by lowering the stop valve stem 5 from the open position of the steam stop valve 2 shown in the figure by the valve driving mechanism, the outer peripheral edge of the lower surface of the valve body 10 is brought into contact with the valve seat portion, and the steam to the steam turbine is discharged. And the stop valve drive mechanism raises the stop valve stem 5, thereby raising the valve body 10 to the height shown in the figure, and fully opening the steam passage to the steam turbine.

Further, the control valve 1 is suspended from a peripheral edge of a bottom surface in which a space for vertically moving the steam stop valve 2 disposed below is formed, and a lower end of the seat portion 6 is formed in the valve chamber 3.
And a cylindrical member 7 forming a gap through which steam passes between the cylindrical member 7 and a slightly smaller diameter than the cylindrical member 7. The valve element 1 provided with a cylindrical member 8 slidable with the sealing material 11 provided and sealing the upper space when the control valve 1 is closed.
0, the lower end is fixed to the center of the upper surface of the valve body 10, and the valve chamber 3
The upper end of the valve body 3 is projected upward through the valve chamber 3 and moved up and down to adjust the size of the gap formed between the seat portion 6 and the peripheral edge of the bottom surface of the valve body. And a control valve rod 4 for controlling the flow rate of the inflow steam.

The opening and closing operation of the control valve 1 is performed by controlling the control valve stem 4 which penetrates the upper end of the valve chamber 3 and protrudes above the valve chamber 3.
, And is driven by a not-shown control valve drive mechanism using a hydraulic cylinder mechanism or the like installed above the valve chamber 3.

That is, the stop valve stem 5 is raised from the fully closed state of the control valve 1 in which the lower end of the cylindrical member 7 shown in FIG. After the valve 2 is fully opened, the control valve drive mechanism is driven to raise the control valve valve rod 4 in accordance with the load of the steam turbine. In addition, a steam passage capable of supplying a steam flow according to the load of the steam turbine to the steam turbine can be formed, and the steam turbine can be operated corresponding to the load.

A plurality of holes 9 are formed in the valve body 10 between the lower end connecting portion of the control valve stem 4 and the upright portion of the cylindrical member 8 to open and close the control valve 1. The operating force of the control valve stem 4 is reduced by equalizing the upper and lower sides of the hour valve body 10.

As described above, in the steam valve shown in FIG. 8, similarly to the steam valve shown in FIG. 7, during the operation of the steam turbine, the stop valve 2 holds the fully open position, and the opening degree of the control valve 1 is changed. By adjusting according to the load, the amount of steam flowing into the steam turbine is controlled. However, in the conventional steam valve having the above-described structure, the stop valve drive mechanism for opening and closing the stop valve 2 controls the control valve 1 in order to control the steam flow supplied to the steam turbine according to the load. And the adjustment valve drive mechanism to perform, for example, because it is necessary to be installed at separate positions on the upper and lower sides of the valve chamber, requires an installation space for the drive mechanism at each position, a large installation space is required, In addition, the operation and maintenance are complicated, and the insertion holes of the control valve stem 4 and the stop valve stem 5 need to be formed in two places in the valve chamber 3, which leads to high production costs. There is.

Further, in the steam valve in which the control valve 1 and the stop valve 2 shown in FIG. 7 are provided at positions separated from the valve chamber 3, the control valve 1 and the stop valve 2 are brought into contact with each other when the steam is shut off. It is necessary to provide two seat portions 6 to be sealed, which further increases the manufacturing cost and, in the integrated steam valve in which the control valve 1 and the stop valve 2 shown in FIG. Since the protruding member of the valve chamber 3 in which the insertion hole for penetrating the rod 5 and the stop valve rod 5 is formed is provided so as to protrude into the steam passage, it is controlled by the control valve 1 to the steam turbine side. There is a problem that the steam that has flowed out is hindered by the stop valve stem 5 and the projecting member 13 forming the valve stem insertion hole, and wasteful pressure loss occurs.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the conventional steam valve, the present invention has an integrated type in which a control valve and a stop valve provided in a valve chamber are arranged close to each other.
A steam valve having a structure similar to that of the steam valve shown in FIG. 8, and a valve rod and a stop valve for transmitting a driving force from a control valve drive mechanism and a stop valve drive mechanism to drive the control valve and the stop valve. By making the valve rod a double pipe, the control valve drive mechanism and the stop valve drive mechanism can be installed at the same position or close to each other, so that the installation space for these drive mechanisms can be reduced, and the seat section can be reduced. It is not necessary to provide two places, the production cost does not increase,
Operation, maintenance, and inspection of these drive mechanisms are facilitated.

Further, since the control valve valve stem and the stop valve stem are formed as a double pipe, the number of insertion ports provided through the valve stems provided in the valve chamber can be reduced to one, thereby reducing the manufacturing cost. Further, the present invention provides a steam valve in which the valve stem or the projecting member into which the valve stem is inserted does not disturb the flow of steam flowing from the valve chamber into the steam turbine, thereby causing unnecessary pressure loss. As an issue.

[0017]

Means for Solving the Problems In order to solve the above-mentioned problems, a first steam valve of the present invention has the following means.

(1) A valve chamber having an integral structure of a steam valve comprising a stop valve for shutting off the flow of steam into the steam turbine and a regulator valve for controlling the flow rate of steam into the steam turbine in accordance with the load of the steam turbine. Provided inside. The integrated structure here does not mean that the stop valve and the control valve are fixed, but by operating one of the valves,
It means that the other valve can be operated or that one valve and the other valve can be operated independently without interference.

(2) One of a stop valve stem for operating the stop valve or a control valve stem for operating the control valve, the base end portion of which is fixed to the central axis of the stop valve and the control valve. For example, a stop valve stem has a hollow structure, and the other end, for example, a control valve stem is inserted concentrically into the hollow structure,
A valve stem was provided in which both tip portions could protrude outside through the same hole drilled in the valve chamber.

(3) The stop valve stem is connected to the tip of a stop valve stem or a control valve stem protruding to the outside from a hole formed in the valve chamber, and by driving the tip, the stop valve stem is driven. Alternatively, a stop valve and a control valve that operate a stop valve and a control valve connected to the base end of the control valve valve rod in the valve chamber to shut off or open and close a steam flow path inlet into the steam turbine. A drive mechanism including a valve drive mechanism was provided.

(A) As described above, one of the stop valve stem and the control valve stem has a hollow structure, and the stop valve stem or the control valve stem is provided inside the hollow stem. Since the other was inserted, the tip portions of both valve stems were simultaneously projected outside from the same hole drilled in the valve chamber,
Only one hole needs to be drilled in the valve chamber, and the stop valve drive mechanism and the control valve drive mechanism for driving both valve stems to operate both valves are located at the same position or close to each other above the valve chamber. It is possible to reduce the cost and the size, and to improve the maintainability and space saving.

The second steam valve of the present invention has the following means in addition to the above-mentioned means (1) to (3).

(4) The steam flowing through the gap formed between the inner periphery of the stop valve stem or the control valve stem having the hollow structure and the inner periphery of the valve stem inserted into the hollow structure is supplied to the hollow structure. A through-hole to be discharged to the outer peripheral side of the cut valve stem was formed in a hollow valve stem.

(5) The steam discharged from the through hole and the outer periphery of the hollow valve rod and both valve rods are projected outside.
A drain pipe for preventing steam from leaking to the outside from a gap formed between the inside of the hole formed in the valve chamber and the inside thereof is provided inside the structure of the valve chamber.

(B) The steam valve according to the present invention is characterized in that
By adopting the means (5), in addition to the above (a), the steam discharged from the through hole into the valve chamber and the steam flowing between the outer circumference of the hollow valve stem and the inner circumference of the hole are combined. , Can be discharged from the interior of the valve chamber by the drain pipe, and can prevent steam leakage from the interior of the valve chamber to the upper part of the valve chamber where the stop valve drive mechanism and the control valve drive mechanism are installed, thereby improving the efficiency of the steam turbine. In addition to this, it is possible to prevent the vicinity of the valve chamber from being contaminated due to steam leakage.

The third steam valve of the present invention has the following means in addition to the above-mentioned means (1) to (3).

(6) The valve rod having the hollow structure has a base end fixed to the central portion of the stop valve, and has a hollow central shaft portion to shut off steam flowing into the steam turbine. The valve consisted of a stop valve stem operated by the driving force of a stop valve drive mechanism.

(7) A valve stem inserted into the hollow structure formed in the stop valve stem is fixed at the base end to the central portion of the control valve, inserted into the hollow structure and inserted into the valve chamber. A control valve for controlling the flow rate of steam flowing into the steam turbine in accordance with the load of the steam turbine is constituted by a control valve stem operated by the driving force of a control valve drive mechanism.

(C) The steam valve of the present invention is characterized in that
By adopting the means of (7), in addition to the above (a), the stop valve stem is inserted through the adjusting valve stem, and the stop valve driving mechanism and the adjusting mechanism are inserted through one hole formed in the valve chamber. In order to protrude outside the valve chamber where the valve drive mechanism is installed, it is necessary to arrange a stop valve stem into the steam flow path into the steam turbine and a projection member for inserting the stop valve stem. Therefore, the resistance loss of steam flowing from the valve chamber into the steam turbine can be reduced, and the efficiency of the steam turbine can be improved.

The fourth steam valve of the present invention employs the following means in addition to the above means (1) to (3), (6) and (7).

(8) Even if a malfunction occurs in the hydraulic cylinder of the control valve drive mechanism that drives the control valve,
An emergency valve that can close the control valve without using the pressure control valve when the steam turbine trips is provided in parallel with the pressure control valve, and provided in a flow path that connects the hydraulic cylinder and the drain.

(D) The steam valve of the present invention employs the means of (8) to control the flow rate of the steam flowing into the steam turbine in addition to the above (a) and (c).
The control valve, which has a complicated structure and is prone to failure, can be closed by the emergency valve provided in parallel with the pressure control valve in addition to the pressure control valve of the conventional control valve drive mechanism. The shutoff of the steam flowing into the steam turbine can be reliably performed in the order of the control valve shutoff and the stop valve shutoff in the same manner as the shutoff of the steam performed in the normal steam turbine. Also, the operation of the stop valve and the operation of the control valve are configured to interfere with each other, so that even if a failure occurs during operation and the control valve stops halfway, the stop valve that operates on the outer peripheral side of the control valve may interfere. The situation in which the shutoff by the stop valve becomes impossible can be avoided by installing the emergency valve so that the control valve is reliably shut off.

The fifth steam valve of the present invention has the following means in addition to the above-mentioned means (1) to (3), (6) and (7).

(9) A main valve vertical hole through which the control valve is inserted through the base end of the control valve stem inserted into the valve chamber is formed in the shaft center, and a main valve lateral hole which communicates with the valve chamber has a side wall. The base end of the control valve valve and the control valve stem that penetrates the main valve vertical hole are fixed to the upper surface axis, and the control valve drive mechanism is driven by the driving force of the control valve drive mechanism. The actuating valve comprises a regulating valve that moves inside the regulating valve parent valve to actuate the regulating valve parent valve.

(E) In the steam valve of the present invention, in addition to the above (a) and (c), the control valve is divided into a control valve main valve and a control valve child valve in addition to the above (9). When the regulator valve is opened, the regulator valve valve is opened, and then the regulator valve is opened and opened, so that steam in the valve chamber flows into the regulator valve from the parent valve side hole. Then, since the pressure flows into the flow path to the steam turbine, the pressure difference between the pressure on the control valve side and the pressure on the steam turbine side is reduced, so that the control valve having a large pressure receiving area or the driving force of the small control valve drive mechanism can be used. You can open and close.

The steam valve is normally opened by fully opening the stop valve and then opening the control valve. However, even if the stop valve is opened, the steam valve remains open until the control valve valve opens. The steam does not flow and the loss of steam can be reduced.

The sixth aspect of the steam valve of the present invention employs the following means in addition to the above-mentioned means (1) to (3).

(10) The valve stem having a hollow structure has a base end fixed to the center of the control valve, and a stop valve has a hollow structure in which the stop valve moves up and down inside. Is controlled by a drive valve of a control valve drive mechanism provided above the valve chamber to control the control valve in accordance with the load of the steam turbine.

(11) A valve stem inserted into a hollow structure formed along the axis of the control valve stem has its base end fixed to the center of the stop valve, and is made hollow to form a valve chamber. The stop valve inserted into the steam turbine and shutting off the steam flowing into the inside of the steam turbine is constituted by a stop valve valve rod operated by the driving force of a stop valve driving mechanism.

(F) The steam valve of the present invention is characterized in that
By adopting the means (11), in addition to the above (a),
Since the control valve stem is inserted through the stop valve stem and protrudes from a single hole formed in the valve chamber to the outside above the valve chamber in which the control valve drive mechanism and the stop valve drive mechanism are installed. In addition, there is no need to arrange a stop valve stem into the steam flow path into the steam turbine and a projection member for inserting the stop valve stem, and the resistance loss of steam flowing from the valve chamber into the steam turbine is reduced. And the efficiency of the steam turbine can be improved.

The seventh steam valve of the present invention employs the following means in addition to the above means (1) to (3), (10) and (11).

(12) Even if a malfunction occurs in the hydraulic cylinder of the control valve drive mechanism that drives the control valve when the steam turbine trips, an operation space in which the control valve can independently operate the stop valve is provided. The stop valve operates without interfering with each other to shut off steam to the steam turbine.

(G) The steam valve of the present invention employs the means (12) described above, and in addition to the above (a) and (f), the control valve operating on the outer peripheral side of the stop valve is provided inside the steam turbine. The structure is complicated because the flow rate of the steam flowing into the steam turbine is controlled, so that a failure is likely to occur. In the case where the failure occurs when the steam turbine trips and the regulator valve that is operated first stops halfway, the above-mentioned (8) The stop valve can be operated without providing the emergency valve and operating the adjusting valve, and the steam flowing into the steam turbine can be shut off.

The eighth steam valve of the present invention employs the following means in addition to the means (1) to (3), (10) and (11).

(13) The stop valve has a main valve vertical hole formed in the axial center thereof through which the base end of the stop valve stem inserted into the valve chamber is inserted, and a main valve lateral hole connected to the valve chamber has a side wall. The stop valve parent valve and the base end of the stop valve valve rod are fixed to the upper surface axis portion, and the stop valve parent valve is operated by the driving force of the stop valve driving mechanism in the stop valve parent valve. And a stop valve element for operating the valve.

(H) The stop valve of the present invention is divided into a stop valve parent valve and a stop valve child valve in addition to the above (a) and (f) by employing the means (13). By opening the stop valve when the stop valve is opened, and then opening and opening the stop valve parent valve, the steam in the valve chamber flows into the stop valve parent valve from the side hole of the parent valve. Then, since the pressure flows into the flow path to the steam turbine, the pressure difference between the stop valve upper side pressure and the steam turbine side pressure is reduced, so that the stop valve having a large pressure receiving area or the small driving force of the stop valve driving mechanism can be used. You can open and close.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a steam valve according to the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment of the steam valve of the present invention, and FIG. 2 is a detailed sectional view of the emergency valve shown in FIG.

As shown in the figure, the control valve 51, the stop valve 52
Are integrally housed in one valve chamber 53, and a U-shaped control valve 51 that opens upward is provided inside a U-shaped stop valve 52 that opens downward. To operate. The stop valve stem 55 and the regulating valve stem 54 are inserted into the valve chamber 53 through one hole 56 drilled at the upper end of the valve chamber 53, and the stop valve stem 55 is formed as a hollow tube. The control valve stem 54 projects from the valve chamber 53 to the outside through the hollow pipe of the stop valve stem 55.

The stop valve stem 55, which is a hollow tube, is
Is driven by a stop valve driving mechanism 58 using a hydraulic cylinder mechanism or the like via a link mechanism 59, and the control valve rod 54 inserted into the hollow tube is similarly connected to the outside of the valve chamber 53. And is driven by an adjusting valve drive mechanism 57 using a hydraulic cylinder mechanism or the like directly or externally via a link mechanism 60.

The control valve driving mechanism 57 includes a pressure control valve 6
1, a hydraulic cylinder 62, an emergency valve 64, and a pressure control valve 61 for controlling the pressure of hydraulic oil in a hydraulic cylinder chamber 63;
The flow rate is controlled, and the control valve 51 is opened and closed via the link mechanism 59 and the control valve valve rod 54 according to the controlled pressure and flow rate. Since the stop valve stem 55 and the control valve stem 54 are inserted from the same hole, the stop valve drive mechanism 5
The control valve 8 and the control valve drive mechanism 57 can be installed at the same location or above the adjacent valve chamber 3.

When flowing steam S to the steam turbine side,
First, the stop valve 52 is opened via the link mechanism 59 and the stop valve rod 55 of the hollow pipe by the stop valve driving mechanism 58 using a hydraulic cylinder mechanism or the like. Next, the control valve 51 is opened by the control valve drive mechanism 57 using a hydraulic cylinder mechanism or the like via the control mechanism valve rod 54 penetrating the link mechanism 60 and the stop valve rod 55 which is a hollow pipe. . When the control valve 51 is opened, steam S having a flow rate corresponding to the opening degree flows into the steam turbine side, and drives the steam turbine according to the flow rate.

As described above, the amount of steam flowing into the steam turbine is controlled by adjusting the opening of the control valve 51 in accordance with the load of the steam turbine. In the conventional integrated steam valve shown in FIG. 8, when the steam S flows through the control valve 51, the stop valve stem 55 and the protruding member 13 forming the valve stem insertion hole of the stop valve stem 55 are provided. Although the flow of the steam S was hindered and the useless pressure loss was increased, in the steam valve according to the present embodiment, as shown in FIG. No, stop valve stem 5
The hole 56 for projecting the valve 5 to the outside is provided in the valve chamber 53 on the opposite side of the flow path.
, Pressure loss can be avoided.

When the steam turbine trips to shut off the steam flowing into the steam turbine, the control valve 51 and the stop valve 52 are closed in this order. Further, when the normal control valve 51 is closed, the hydraulic control 62 is operated by the hydraulic oil from the hydraulic pressure source 68 of the control valve drive mechanism 57, so that the hydraulic cylinder 62 passes through the discharge passage in the pressure control valve 61. Hydraulic fluid flows into the drain 67, the pressure in the hydraulic cylinder chamber 63 is reduced, and the pressure of the hydraulic oil in the hydraulic cylinder 62 is overcome by the spring force of the control valve closing spring 66 to close the control valve 51.

However, at the time of closing the control valve drive mechanism 5
7, the pressure control valve 61 and the like fail, the pressure control valve 61 does not operate, and the hydraulic oil in the hydraulic cylinder chamber 63 does not flow to the drain 67. Since the pressure of the hydraulic oil in the cylinder chamber 63 is greater than the spring force of the control valve closing spring 66, the control valve valve rod 54 does not operate and the control valve 51 cannot be closed. There is.

In order to avoid this, separately from the pressure control valve 61, an emergency valve 64 is provided in a flow path connecting the hydraulic cylinder chamber 63 to the drain 67 in parallel with the pressure control valve 61. That is, when the steam turbine trips,
The pressure control valve 61 interposed in the flow path connecting the hydraulic cylinder chamber 63 and the drain 67 is connected to the trip pipe 6.
The hydraulic oil in the hydraulic cylinder chamber 63 is caused to flow to the drain 67 by the hydraulic fluid supplied from the hydraulic fluid supplied from the drain 5, and the pressure in the hydraulic cylinder chamber 63 is reduced to a level that the spring force of the control valve closing spring 66 can overcome. To be able to.

Further, a flow path provided with an emergency valve 64 is provided in parallel with a flow path connecting the hydraulic cylinder chamber 63 in which the pressure control valve 61 is provided and the drain 67. By using the hydraulic oil supplied from the trip pipe 65, the emergency valve 64 is placed on the discharge flow path side like the pressure control valve 61, and the flow path is opened.
Even when the pressure control valve 61 fails, the operating oil flows from the hydraulic cylinder chamber 63 to the drain 67 through the discharge passage in the emergency valve 64, thereby lowering the operating oil pressure in the hydraulic cylinder chamber 63, and The adjusting valve 51 can be closed by the spring force of the valve closing spring 66.

FIG. 2 is a diagram showing details of an example of the structure of the emergency valve 64. As shown in FIG. 2, during normal operation, the trip piping 65 is provided in the valve body upper chamber 71 of the emergency valve 64. Hydraulic fluid flows into the valve body upper chamber 71, and a constant hydraulic pressure acts on the valve body upper chamber 71, and the force due to this pressure overcomes the spring force of the emergency valve spring 73 that closes the emergency valve body 72. Thus, the emergency valve 64 is closed to shut off the flow path connecting the drain 67 to the hydraulic cylinder 62. That is, the hydraulic oil in the trip pipe 65 connected to the valve body upper chamber 71 overcomes the emergency valve spring 73 during normal operation, and holds the emergency valve valve body 72 at a position where the drain 67 and the hydraulic cylinder chamber 63 are shut off. The pressure of the hydraulic oil is reduced when the steam turbine trips.

For this reason, when the operating oil pressure in the trip pipe 65 is reduced by the steam turbine trip signal, the pressure in the valve body upper chamber 71 is reduced, and the force of the emergency valve spring 73 is reduced by the pressure. The emergency valve valve element 72 which has overcome and cut off the flow path communicating with the hydraulic cylinder 62
However, operating in the opening direction, the hydraulic oil in the hydraulic cylinder chamber 63 flows to the drain 67, lowering the pressure in the hydraulic cylinder chamber 63 and closing the control valve 51. By changing the spring force of the emergency valve spring 73, it is possible to change the opening timing of the emergency valve body 72.

In FIG. 1, reference numeral 53a designates a valve chamber 5 which slides around the stop valve 52 when the stop valve 52 is opened and closed.
A plurality of valve chamber lateral holes 52a are formed in the circumferential direction of a cylindrical hanging member 53b vertically provided in the inside 3; 52a is an outer peripheral side of the stop valve valve rod 55 of the stop valve 52 to which the lower end of the stop valve valve rod 55 is fixed. The stop valve driving mechanism for opening and closing the stop valve 52 reduces the load on the stop valve 58 by using a plurality of stop valve vertical holes formed in the circumferential direction. In FIG. 2, reference numeral 74 denotes a drain for discharging hydraulic oil below the emergency valve valve body 72 when the hydraulic cylinder 62 by the emergency valve 64 cuts off the flow path connecting the drain 67. .

In the conventional steam valve, the trip pipe 65 is generally connected to a plurality of control valves, a stop valve driving mechanism, and when the pressure in the trip pipe 65 decreases, the emergency valve of the present embodiment is used. A plurality of control valves and stop valve drive mechanisms are operated by the same mechanism principle as the operation of opening the control valve 64, and the control valves 1 and the stop valve 3 shown in FIG. 8 are closed.

As described above, the conventionally used trip pipe 65 is branched to the emergency valve 64, the emergency valve 64 is communicated with the hydraulic cylinder chamber 63 of the control valve drive mechanism 57, and the communication channel is opened and closed. By doing so, even if the pressure control valve 61 fails when the steam turbine trips, the control valve 51 can be closed without any problem. In addition, the control valve stem 54
Steam leaks upward from the gap between the outer circumference and the outer circumference of the stop valve stem 55, which is a hollow tube, and the inner circumference of the hole 56. As shown in the figure, as shown in FIG. By providing a through-hole 70 penetrating through the through hole and installing a drain pipe 69 communicating with the through-hole 70, it is possible to prevent the steam S from leaking out of the valve chamber 53 from the gap.

The steam valve according to the present embodiment is configured as described above. The stop valve 52 and the control valve 51 are integrally housed in the valve chamber 53, and the stop valve is a hollow tube. With the structure in which the adjusting valve stem 54 is passed through the valve stem 55, the valve chamber 53 is operated to operate the two valves 51 and 52.
Since only the insertion hole 56 for inserting one valve stem is required as an insertion hole that needs to be provided through the through hole, the effect of saving space, improving maintainability, and reducing costs can be achieved. Since the stop valve 52, the stop valve stem 55 for operating the control valve 51, and the hole 56 for inserting the control valve stem 54 are the same, the stop valve is provided via the link mechanisms 60, 59 and the valve stems 54, 55. Since the stop valve drive mechanism 58 and the control valve drive mechanism 57 for driving the opening and closing of the control valve 52 and the control valve 55 can be installed at the same position, it is possible to achieve an improvement in maintenance and a space saving without increasing the manufacturing cost.

Further, by providing the emergency valve 64 in the control valve drive mechanism 57 using the hydraulic cylinder 62, the pressure control valve 6 for controlling the pressure and flow rate acting on the hydraulic cylinder 62 is provided.
Even if a malfunction occurs in the control valve 1, the control valve 51 can be reliably closed when the steam turbine trips.

Further, the leakage of steam from the hole 56 into which the valve rods 55 and 55 are inserted into the valve chamber 53 can be prevented by providing a through hole 70 in the stop valve rod 55 which is a hollow pipe.
Both the leakage of steam S flowing through the gap between the outer circumference and the inner circumference of the stop valve stem 55 and the leakage of steam S flowing through the gap between the outer circumference of the stop valve stem 55 and the inner circumference of the hole 56 are reduced by one drain. Tube 6
It is possible to prevent this by escaping to 9.

Next, FIG. 8 shows a second embodiment of the steam valve according to the present invention.
FIG. 4 is a longitudinal sectional view showing an operation state of the steam valve shown in FIG. 3. Although the steam valve of the present embodiment has substantially the same structure and the same operation as the steam valve of the first embodiment shown in FIG. 1, the control valve 5 shown in FIG.
1 is a control valve 75 composed of a child valve 77 and a parent valve 76
Has been. That is, as shown in FIG. 3, the control valve 75 and the stop valve 5 comprising the control valve main valve 76 and the child valve 77.
2 are housed integrally in one valve chamber 53 and housed in the valve chamber 53, and the control valve main valve 76 and the control valve element valve 77 constituting the control valve 75 are arranged in the stop valve 52. .

Further, the stop valve stem 55 and the control valve stem 54
Is inserted into the valve chamber 53 through one hole 56 formed in the valve chamber 53 in the same manner as in the first embodiment, and the stop valve stem 55 is a hollow tube. Is designed such that the distal end portion of the stop valve stem 55 projects through the hollow tube of the stop valve stem 55 to the outside of the valve chamber 53. The lower end is fixed to the axial center portion of the child valve 77 by penetrating the drilled parent valve vertical hole 78a.

The stop valve stem 55, which is a hollow pipe, is the first embodiment.
Similarly to the embodiment, outside the valve chamber 53, a control valve driving mechanism 58 using a hydraulic cylinder mechanism or the like via a link mechanism 59, and a control valve valve rod 54 inserted into the hollow pipe also has a valve chamber. 53 is driven by an adjusting valve drive mechanism 57 using a hydraulic cylinder mechanism or the like directly or via a link mechanism 60.

The control valve drive mechanism 57 also includes a pressure control valve 61, a hydraulic cylinder 62, and an emergency valve 64 as in the first embodiment.
And the hydraulic cylinder chamber 6 is controlled by the pressure control valve 61.
3, the pressure and flow rate of the hydraulic oil are controlled,
The control valve 51 is opened and closed according to the flow rate. In FIG. 3, reference numeral 78b denotes a master valve side hole,
Is driven to reduce the load.

Also in the steam valve of the present embodiment, as described above, the stop valve stem 55 and the control valve stem 54 are connected to the valve chamber 5.
3, the stop valve drive mechanism 58 for opening and closing the stop valve 52 and the control valve drive mechanism 57 for opening and closing the control valve 75 are located in the same place. Can be installed. When the steam S flows to the steam turbine side, first, as shown in FIG. 4A, a link mechanism 59 and a stop valve valve of a hollow pipe are provided by a stop valve driving mechanism 58 using a hydraulic cylinder mechanism or the like. The stop valve 52 is opened via the rod 55. Next, as shown in FIG. 4B, although not shown in FIG. 4 using a hydraulic cylinder mechanism or the like, a link mechanism 60 and a hollow pipe are formed by a control valve driving mechanism 57 shown in FIG. The slave valve 77 is opened via the adjusting valve stem 54 passing through the stop valve stem 55.

When the child valve 77 is opened, the steam S flows into the flow path to the steam turbine from the master valve side hole 78b formed in the master valve 76, so that the upper pressure of the control valve 75 and the steam turbine pressure are reduced. The force caused by the differential pressure between the upper pressure of the control valve 75 and the turbine side pressure acting on the control valve master valve 76 which has been equalized and has a large pressure receiving area is reduced, and a small driving force is used.
As shown in (c), the control valve valve 76 can be lifted by the control valve valve 77. When the control valve 76 is opened, the steam S corresponding to the opening degree flows into the steam turbine side. By adjusting the opening degree of the control valve 76, the amount of steam flowing into the steam turbine side is reduced by the steam turbine. Is controlled to the inflow amount according to the load of the vehicle.

In a conventional integrated steam valve, the steam S
When the gas flows through the control valve 76, the stop valve stem 5 and the protruding member 13 forming the valve stem insertion hole impede the flow of steam S, causing an unnecessary increase in pressure loss. Similarly to the first embodiment, the steam valve of the present embodiment also
Since the stop valve stem 55 and the protruding member 13 are not provided in the flow path through which the steam S passes, unnecessary pressure loss can be avoided.

When the steam turbine trips to shut off the flow of steam into the steam turbine, the control valve 75 of the control valve 75, the control valve master valve 76, and the stop valve 52 are closed in this order. When the normal control valve 75 is closed, the pressure control valve 61 of the control valve drive mechanism 57 is operated, so that hydraulic oil flows from the hydraulic cylinder 62 to the drain 67 through the pressure control valve 61, and the hydraulic cylinder chamber When the pressure of 63 is reduced and the spring force of the control valve closing spring 66 overcomes the force of the operating oil pressure in the hydraulic cylinder 62, the control valve 75 can be closed. The pressure control valve 61
Of the regulating valve 75 by the emergency valve 64 assuming the failure of
The description is omitted because it is the same as that of the first embodiment.

Further, steam leaks from the outer periphery of the control valve stem 54 and the outer periphery of the stop valve stem 55 which is a hollow pipe. However, as shown in FIG. This is similar to the first embodiment in that steam can be prevented from leaking out of the valve chamber 53 by providing a drain pipe 69 communicating with the through hole 70.

The steam valve of the present embodiment has the above-described structure, and has a control valve separate from a stop valve 52 and a control valve valve 77 in order to reduce the driving force. The valve 75 and the valve 75 are integrally housed in the valve chamber 53, and the control valve rod 54 is passed through the stop valve rod 55 which is a hollow tube. Since the hole 56 is sufficient, the space saving, good maintenance, and cost reduction can be achieved. The stop valve 52 and the hole 56 for inserting the valve rods 54 and 55 of the control valve 75 are the same. Therefore, the link mechanisms 59, 60, the valve stems 54, 5
Since the stop valve drive mechanism 58 and the control valve drive mechanism 57 for driving the valves 52 and 75 to open and close via the valve 5 can be installed at the same position, it is possible to improve maintenance and save space.

Further, by providing the emergency valve 64 in the control valve drive mechanism 57 using the hydraulic cylinder 62, even when a malfunction occurs in the pressure control valve for controlling the pressure and flow rate acting on the hydraulic cylinder 62, the steam In order to reduce the driving force at the time of turbine trip, the control valve main valve 76 and the control valve valve 77
However, the control valve 75 can be reliably closed.

Further, the leakage of steam from the hole 56 into which the valve rods 54 and 55 are inserted flows through the outer circumferential gap of the control valve rod 54 by providing the through-hole 70 in the stop valve rod 55 which is a hollow pipe. It is possible to prevent both the leakage and the leakage flowing through the outer peripheral clearance of the stop valve 55 by unifying both into the drain pipe 69.

Further, in the steam valve according to the present embodiment, in addition to the above-described effects and effects, the control valve 75 is divided into a control valve main valve 76 and a control valve element valve 77. When the control valve 75 is opened, the control valve drive mechanism 57 using a hydraulic cylinder mechanism or the like controls the control valve valve via the control mechanism valve rod 54 passing through the link mechanism 60 and the stop valve valve rod 55 which is a hollow tube. By opening the adjusting valve element valve 77, the steam S flows into the flow path to the steam turbine from the master valve side hole 78b drilled in the adjusting valve master valve 76. The pressure and the steam turbine side pressure are equalized, and the force due to the pressure difference between the upper pressure of the regulator valve 75 and the turbine pressure is reduced. In particular, despite the large pressure receiving area, the regulator valve 76 is Control valve that can be lifted with small driving force The opening of the control valve 76 is adjusted by flowing steam S corresponding to the opening of the control valve 76 into the steam turbine side and opening and closing the steam S in accordance with the load of the steam turbine. It can be performed with a small driving force.

FIG. 5 is a vertical sectional view showing a third embodiment of the present invention. In the figure, the control valve 51, the stop valve 5
2 is housed integrally in one valve chamber 53, which is the same as in the first and second embodiments. However, in this embodiment, the stop valve 52 is provided in the control valve 51. So that they can be placed. In addition, the stop valve valve stem 55, the control valve stem 54, and the valve chamber 5 through one hole 56 opened in the valve chamber 53.
3 is the same as in the first and second embodiments, but in this embodiment, the control valve stem 54 is a hollow pipe, and the stop valve stem 55 is Valve stem 54
Through the inside of the hollow tube of the valve chamber 53 to the outside of the valve chamber 53.

A control valve valve rod 54, which is a hollow tube, is provided outside the valve chamber 53 by using a hydraulic cylinder mechanism or the like via a link mechanism 60. The control valve has a structure similar to that shown in FIGS. Similarly, the stop valve stem 55 driven by the valve drive mechanism 7 and inserted into the hollow pipe is also a stop valve drive mechanism 58 using a hydraulic cylinder mechanism or the like directly outside the valve chamber 53 or via a link mechanism 59. Driven by As described above, although the valve stems formed as hollow tubes are different, the stop valve stem 55 and the control valve stem 54 are formed through the same hole formed in the valve chamber 53.
The stop valve drive mechanism 58 and the control valve drive mechanism 57 can be installed at the same location.

In the steam valve of the present embodiment, when steam flows to the steam turbine side, first, a stop mechanism driving mechanism 58 using a hydraulic cylinder mechanism or the like causes a link mechanism 59 and a control valve rod which is a hollow pipe. The stop valve 52 is moved to the position indicated by the dotted line via the stop valve stem 55 passing through the inside 54 and is opened. At this time, although the control valve 51 is fully closed, as shown in the figure,
Since the control valve 51 is formed in a U-shape, the stop valve 5
Even if 2 moves and the upper end similarly formed in a U-shape comes into contact with the inner peripheral surface of the upper end of the control valve 51, the side wall of the stop valve 52 remains on the side wall of the control valve 51. There is no contact and it can be opened to the fully open state.

Next, the link mechanism 60 and the control valve stem 5 are controlled by the control valve drive mechanism 57 using a hydraulic cylinder mechanism or the like.
4, the control valve 51 is opened. When the control valve 1 is opened,
Steam flows into the turbine according to the opening degree. By adjusting the opening of the control valve 51 in this manner, the steam S
Is controlled to the steam turbine side.

In a conventional integrated steam valve, the steam S
When the gas flows through the control valve 1, the stop valve stem 5 and the projecting member 13 forming the valve stem insertion hole hinder the flow of the steam S, causing a wasteful increase in pressure loss. In such a steam valve, as shown in the figure, when the steam S flows to the steam turbine side according to the opening / closing degree of the control valve 51,
Since there is no member forming the stop valve valve rod 55 and the hole 56 for inserting the valve rods 54 and 55 at a location where steam passes, useless pressure loss due to these members can be avoided.

When the steam turbine trips to shut off the flow of steam into the steam turbine, the control valve 51 and the stop valve 52 are closed in this order as described above.
That is, in the embodiment shown in FIGS. 1 and 3, when the relative movement of the control valve 51 and the stop valve 52 is made relatively clear, the lower end of the stop valve 52 collides with the lower end projecting portion of the control valve 51, as apparent from these figures. Since the valve 52 does not close, the control valve 51
It is essential to close the stop valve 52 after stopping the operation.

On the other hand, in the steam valve of the present embodiment, when the control valve 51 is closed, even if the stop valve 52 is fully opened,
As described above, the control valve 51 has a U-shape, and the control valve 51 to be closed can move without contacting the stop valve 52, and the control valve 51 can be opened and closed regardless of the opening and closing of the stop valve 52. Can be done. Conversely, in the present embodiment, the stop valve 52 moves inside the control valve 51 to open and close the valve, but the stop valve 52 is moved to the open / close position of the control valve 51 disposed outside. Regardless, the steam flow to the steam turbine side can be cut off when the steam turbine trips.
This does not mean that the lower end of the stop valve 52 is necessarily vertical.

Further, the stop valve driving mechanism 58 is connected to the stop valve 52.
By simply opening and closing the valve, it is possible to use a simple mechanism instead of controlling the steam flow to the steam turbine side. Therefore, unlike the control valve drive mechanism 57, there is almost no possibility that the mechanism will not be closed when the steam turbine trips. Therefore, even when a malfunction occurs in the pressure control valve 61 and the like in the control valve drive mechanism 57 of the first and second embodiments, it is necessary to close the control valve 51 because it is indispensable. Hydraulic oil in the hydraulic cylinder 62 shown in the first and second embodiments is caused to flow through the drain 67 to reduce the pressure in the hydraulic cylinder chamber 63, and the adjusting valve 51 can be closed by the spring force of the adjusting valve closing spring 66. It is not necessary to provide such an emergency valve 64 in the steam valve of the present embodiment, and the control valve drive mechanism 57 can be simplified.

The lower end of the control valve 51 of the present embodiment has no radial swelling.
The actual shape of the control valve 51 is made complicated, and FIGS.
Is provided with a bulge at the lower end similarly to the control valve 51 shown in FIG. 1, but this bulge is omitted because it has nothing to do with the description of the operation of the control valve 51 and the stop valve 52.

Steam leaks from the gap between the outer periphery of the stop valve stem 55 and the inner periphery of the regulating valve stem 54 and the gap between the outer periphery of the regulating valve stem 4 which is a hollow tube and the inner periphery of the hole 56. However, as in the first and second embodiments, the control valve stem 54
By providing a through hole 70 in the through hole 70 and installing a drain pipe 69 communicating with the through hole 70 in the valve chamber 53, it is possible to prevent steam from leaking out of the valve chamber 53.

The steam valve according to this embodiment is configured as described above, and the stop valve and the control valve are housed integrally in the valve chamber, and are different from those of the first and second embodiments described above. On the other hand, by using a structure in which a stop valve stem is passed through a control valve stem that is a hollow pipe, only one hole 56 is required for two valves. The effect of being able to achieve the down is exerted, and since the stop valve valve rod 55 and the hole 56 for inserting the adjusting valve valve rod 54 are the same, the valve is provided via the link mechanisms 59, 60 and the valve rods 55, 54. Since the stop valve drive mechanism 58 and the control valve drive mechanism 57 for driving the opening and closing of the valve can be installed at the same position, improvement of maintenance and space saving can be achieved.

Further, the leakage of steam from the hole 56 into which the valve rods 54 and 55 are inserted can be prevented by providing a through-hole 70 in the control valve rod 54 which is a hollow tube. It is possible to prevent both of the leakage flowing through the outer peripheral clearance of the stop valve valve shaft 55 by releasing the leakage to one drain pipe 69.

In the steam valve of the present embodiment, in addition to obtaining the above-described functions and effects, the control valve 51 and the stop valve 52 are disposed inside the valve chamber 53 with the inside and outside reversed, and the control valve 51 And the stop valve 52 can move without interfering with each other to control or cut off the amount of steam flowing into the steam turbine. Even if a trouble occurs, the inflow of steam into the steam turbine can be reliably shut off by the stop valve 52. Therefore, the emergency valve 64, which is required to be installed in the first and second embodiments, is installed. This eliminates the need for installation, simplifies the regulator valve driving mechanism 57, saves space, improves maintenance, and can further reduce costs.

FIG. 6 shows a fourth embodiment of the steam valve according to the present invention.
It is a longitudinal section showing an embodiment. The steam valve of the present embodiment
Although the steam valve according to the third embodiment shown in FIG. 5 has substantially the same structure and the same operation as the steam valve according to the third embodiment shown in FIG. 5, the stop valve 52 shown in FIG. 75
Similarly to the above, a stop valve 79 including a stop valve parent valve 80 and a stop valve valve 81 was provided.

That is, as shown in FIG. 6, a stop valve 79 composed of a stop valve parent valve 80, a stop valve valve valve 81 and a control valve 51 are integrally housed in one valve chamber 53. The valve parent valve 80 and the stop valve element 81 are disposed in the control valve 51 having a U-shaped cross-section with a downward opening, similarly to the control valve 51 of the fifth embodiment shown in FIG. Have been. The lower end is inserted through a parent valve vertical hole 80 a formed in the axial center of the parent valve 80, and the lower end is fixed to the axial center of the stop valve stem 55 and the control valve 51 fixed to the axial center of the slave valve 81. The control valve stem 54 having a fixed lower end is inserted into the valve chamber 53 from one hole 56 that opens above the valve chamber 53.

The control valve stem 54 is formed as a hollow tube, is inserted through the hole 56, and has an upper end protruding into the valve chamber 53. The stop valve stem 55 is a hollow tube of the control valve stem 54. Similarly, the upper end protrudes outside the valve chamber 53 through the inside. The control valve stem 54, which is a hollow pipe, is provided outside the valve chamber 53 and a link mechanism 60.
Valve drive mechanism 5 using a hydraulic cylinder mechanism or the like
Similarly, the stop valve stem 55 inserted into the hollow pipe is driven directly by the outside of the valve chamber 53 or by the link mechanism 5.
9 through a stop valve drive mechanism 58 using a hydraulic cylinder mechanism or the like.

As described above, the stop valve stem 55 and the control valve stem 54 are inserted into the valve chamber 53 through the same hole 56 to drive the stop valve 79 and the control valve 51. The drive mechanism 58 and the control valve drive mechanism 57 can be installed at the same place above the valve chamber 53, at least at a place close to it.

When flowing steam S to the steam turbine side,
First, a stop valve drive mechanism 58 using a hydraulic cylinder mechanism or the like causes a link mechanism 59 and a control valve valve rod 5 which is a hollow pipe.
The stop valve element 81, which is in contact with the valve chamber formed at the lower end axial portion of the stop valve parent valve 80, is moved upward through the stop valve valve rod 55 passing through the inside of the valve valve 4, and is opened. In this way, by opening the stop valve element 81, the stop valve 79 and the flow path to the steam turbine communicate with each other through the main valve side hole 80b, and the stop valve upper pressure and the steam turbine side pressure are equalized. Valve 79
The differential pressure between the stop valve upper pressure and the steam turbine side pressure acting on the stop valve becomes small, and the stop valve 79 can be lifted by the stop valve element 81 driven by the stop valve drive mechanism 58 with a small driving force.

At this time, although the control valve 51 is fully closed, since the control valve 51 has a U-shape as shown in FIG.
Even if the stop valve parent valve 80 is fully opened, the stop valve parent valve 80 does not contact the control valve 51.

Next, the link mechanism 60 and the control valve stem 5 are controlled by the control valve drive mechanism 57 using a hydraulic cylinder mechanism or the like.
4, the control valve 51 is opened. When the control valve 51 is opened, the steam S flows into the steam turbine according to the opening degree. Therefore, by adjusting the opening of the control valve 51, the amount of steam S flowing into the steam turbine is controlled,
The steam turbine is driven by a steam flow rate corresponding to the load, and outputs a driving force to the outside.

In the conventional integral type steam valve, when the steam flows through the control valve 1, as shown in FIG. 8, a stop valve stem 5 and a projecting member 13 having a valve stem insertion hole are formed.
However, the flow of steam was hindered, resulting in an unnecessary increase in pressure loss. However, in the steam valve according to the present embodiment, as shown in FIG.
Furthermore, since there is no equivalent to the protruding member 13, unnecessary pressure loss can be avoided.

When the steam turbine trips to shut off the steam flow to the turbine side, the control valve 51 and the stop valve 79
The child valve 81 and the parent valve 80 are closed in this order. Further, when the control valve 51 is closed, even if the master valve 80 is in the fully open state shown by the dashed line, the control valve 51 has a U-shape with a downward opening as shown in FIG. The valve 51 does not prevent the upper end of the master valve 80 from closing the contact control valve 51. Also, the outer periphery of the stop valve stem 55 and the inner periphery of the control valve stem,
The steam S leaks from a gap formed between the outer periphery of the regulating valve stem 54 and the inner periphery of the hole 56, which is a hollow pipe. However, as shown in FIG. By providing the drain pipe 69 communicating with the through hole 70 and providing the drain pipe 69, it is possible to prevent the steam from leaking out of the valve chamber 53, as in the above-described embodiment.

The steam valve according to the present embodiment is configured as described above, and is used to reduce the driving force.
A stop valve 79 and a control valve 51 having a structure divided into 0 and a stop valve valve 81 are housed integrally in a valve chamber 53, and a stop valve valve rod 54 is provided in a control valve rod 54 which is a hollow tube. With the structure through which the valve 55 passes, it is only necessary to drill one hole 56 in the valve chamber 53 so that the control valve stem 54 can be inserted for driving the two valves 51 and 79. The space saving, good maintainability, and cost reduction can be achieved. Since the stop valve stem 55 and the adjusting valve stem 54 are inserted in the same hole 56, the link mechanism 5 is provided.
9, 60, the stop valve drive mechanism 58 for opening and closing the valves 79, 51 via the valve rods 55, 54, and the control valve drive mechanism 57 can be installed at the same position, thereby improving maintenance and saving space. it can.

Further, the leakage of steam from the holes 56 into which the valve rods 55 and 54 are inserted flows through the outer circumferential gap of the control valve rod 70 by providing the through hole 70 in the control valve rod 54 which is a hollow tube. It is possible to prevent both the leakage and the leakage flowing through the outer peripheral gap of the stop valve stem 55 by releasing the leakage to one drain pipe 69.

In the steam valve according to the present embodiment, in addition to the above-described effects and effects, in the state where the control valve 51 is closed and the stop valve 79 is closed when the steam turbine trips, the right side of FIG. In the second embodiment shown in FIG. 3, the control valve 73 comes before the stop valve 52 in the second embodiment shown in FIG. Although there is a problem that does not occur because the valve is closed, the stop valve 79 is made up of the stop valve master valve 80 and the stop valve valve 81 in the same manner as the control valve 75 in the second embodiment, so that the stop is stopped. Valve 79
When the valve is opened, a stop valve driving mechanism 58 using a hydraulic cylinder mechanism or the like opens a stop valve element 81 through a link mechanism 59 and a stop valve rod 55 passing through a control valve rod 54 which is a hollow pipe. Then, by opening the stop valve element 81,
The steam S is supplied from the parent valve side hole 80b formed in the stop valve parent valve 80.
Flow valve to the steam turbine, the stop valve 79
The upper pressure and the steam turbine side pressure are equalized, and the stop valve 7
9. The force due to the upper pressure and the turbine side pressure is reduced, and in particular, even the stop valve parent valve 80 having a large pressure receiving area can be opened and closed by the stop valve element 81 which is lifted with a small driving force. The drive mechanism 58 can close the stop valve parent valve 80, in other words, close the stop valve 79 with a small driving force.

[0103]

As described above, the steam valve according to the present invention has an integral structure and is provided in the valve chamber to stop the flow of steam, and to control the steam flow in accordance with the steam turbine load. The base end is a stop valve, one of a stop valve stem for actuating the stop valve or a stop valve stem for actuating the actuation valve, which is fixed to the central axis of the adjust valve, respectively, and has a hollow structure,
The other is inserted into this hollow structure, the valve stem capable of projecting both ends from the same hole drilled in the valve chamber to the outside, respectively connected to the tip of the valve stem projecting outside from the hole,
By driving the distal end, the two valves connected to the base end of the valve stem are operated, and a drive mechanism including a stop valve drive mechanism and a control valve drive mechanism for opening and closing the steam flow path inlet into the steam turbine is provided. Provided.

As a result, only one hole is required to make one end hollow and the other end to be inserted, and the tip of both valve stems to simultaneously project outside from the same hole in the valve chamber. The valve drive mechanism and the control valve drive mechanism can be arranged at the same position or close position above the valve chamber, so that cost reduction and downsizing can be achieved, and maintainability and space saving can be improved.

Further, the steam valve of the present invention has a hollow structure for discharging steam flowing between the inner periphery of a hollow valve stem and the outer periphery of a valve stem inserted into the hollow structure to the outer periphery of the hollow valve stem. Steam leaks to the outside from the through hole provided in the valve stem, the steam from the through hole and between the outer periphery of the hollow valve stem and the inner periphery of the hole formed in the valve chamber where both valve stems project outward. A drain pipe provided in the valve chamber structure for preventing the occurrence of the drainage was provided.

Thus, the steam discharged from the through hole to the outside of the valve chamber and the steam flowing between the outer circumference of the hollow structure valve stem and the inner circumference of the hole can be discharged together from the inside of the valve chamber by the drain pipe. It is possible to prevent steam leakage from the interior to the upper part of the valve chamber, improve the efficiency of the steam turbine, and prevent contamination due to steam leakage around the valve chamber.

The steam valve according to the present invention has a base end fixed to a center portion of the stop valve, a shaft center portion having a hollow structure, and a stop valve for operating a stop valve for shutting off steam flowing into the inside of the steam turbine. A valve stem inserted into the hollow structure of the valve stem and stop valve stem has its base end fixed to the center of the control valve, and is inserted into the hollow structure to adjust the steam flow into the steam turbine according to the load. A valve stem for actuating a regulator valve controlled by means of a valve is provided.

As a result, since the stop valve stem is inserted through the inside of the control valve stem and protrudes from one hole of the valve chamber to the outside above the valve chamber, the stop valve stem extends to the steam flow path into the steam turbine. There is no need to dispose the stop valve stem and the protrusion member that penetrates the stop valve stem, so that the resistance loss of steam from the valve chamber to the inside of the steam turbine can be reduced, and the efficiency of the steam turbine can be improved.

Further, in the steam valve according to the present invention, when the control valve drive mechanism has a malfunction of the hydraulic cylinder of the control valve drive mechanism that drives the control valve, the emergency valve that closes the control valve is controlled by the pressure control valve regardless of the pressure control valve. It was provided in parallel with the control valve.

As a result, the control valve, which has a complicated structure for controlling the flow rate of the steam flowing into the steam turbine and is easily broken, can be closed by the emergency valve in addition to the pressure control valve of the control valve drive mechanism. The shut-off of the inflowing steam can be reliably performed in the order of the control valve cutoff and the stop valve cutoff as in the normal operation.

Even if a malfunction occurs during operation and the control valve stops halfway, the interference with the stop valve operating on the outer peripheral side of the control valve is prevented, so that it is possible to reliably prevent the stop by the stop valve from being impossible. it can.

The control valve of the steam valve according to the present invention is characterized in that a main valve vertical hole for inserting a base end portion of a control valve rod inserted into the valve chamber is bored at the shaft center, and the main valve communicates with the valve chamber. The base end of the control valve master valve and the control valve stem with a side hole drilled in the side wall is fixed to the upper surface axis, and the control valve is actuated within the control valve master valve by the driving force of the control valve drive mechanism. And a control valve for operating the parent valve.

As a result, the control valve is divided into a control valve parent valve and a control valve stem valve, so that when the control valve is opened, the control valve stem valve is opened, and then the control valve master valve is opened and opened to open the valve chamber. The steam flows from the vertical hole of the parent valve into the flow path to the inside of the control valve main valve and to the steam turbine, reducing the differential pressure between the pressure on the control valve upper side and the pressure on the steam turbine side. Can be opened and closed with force.

Further, the valve stem of the steam valve of the present invention has a base end portion fixed to the center portion of the control valve, and has a hollow shaft portion to control the steam flow to the steam turbine according to the steam turbine load. The base end of the valve stem inserted into the hollow structure of the control valve is fixed to the center of the stop valve, and is inserted through the hollow stem of the control valve. And a stop valve stem for operating a stop valve that shuts off steam flowing into the steam turbine.

As a result, the control valve stem is inserted through the stop valve stem, protrudes from one hole of the valve chamber to the outside above the valve chamber,
There is no need to dispose a stop valve stem in the steam flow path of the steam turbine and a projection member that penetrates the stop valve stem, the resistance loss of steam flowing into the steam turbine can be reduced, and the efficiency of the steam turbine can be improved.

Further, the steam valve of the present invention has an operation space in which the control valve can independently operate the stop valve, and even if a malfunction occurs in the hydraulic cylinder of the control valve drive mechanism, the stop valve can be controlled by the control valve. It operates without interference and can shut off steam.

Accordingly, even if the control valve that operates on the outer peripheral side of the stop valve fails and the control valve that was operated first at the time of tripping the steam turbine stops halfway, the emergency valve is provided to operate the control valve. Without shutting down, the stop valve can shut off the inflowing steam.

Further, the steam valve according to the present invention has a master valve vertical hole formed in an axis passing through the base end of a control valve stem in which the control valve is inserted into the valve chamber, and a master valve communicating with the valve chamber. The control valve main valve having a lateral hole formed in the side wall, the base end of the control valve stem is fixed to the upper surface axis portion, and the control valve drive valve operates to operate the control valve main valve by the operation in the control valve main valve. The valve consists of a control valve.

By dividing the control valve into a control valve valve and a control valve valve, the control valve valve is opened when the control valve is opened, and then the control valve valve is opened and opened to open the valve chamber. From the vertical hole of the parent valve into the flow path to the inside of the control valve main valve and to the steam turbine, reducing the differential pressure between the pressure on the control valve upper side and the pressure on the steam turbine side. Can be opened and closed with force.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a steam valve of the present invention;

FIG. 2 is a detailed sectional view of the emergency valve shown in FIG. 1;

FIG. 3 is a longitudinal sectional view showing a second embodiment of the steam valve of the present invention,

FIG. 4 is a longitudinal sectional view showing an operation state of the steam valve shown in FIG. 3;

FIG. 5 is a longitudinal sectional view showing a third embodiment of the steam valve of the present invention,

FIG. 6 is a longitudinal sectional view showing a fourth embodiment of the steam valve of the present invention,

FIG. 7 is a longitudinal sectional view showing an example of a conventional steam valve;

FIG. 8 is a longitudinal sectional view showing another example of the conventional steam valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 (steam) control valve 2 (steam) stop valve 3 valve room 4 control valve stem 5 stop valve stem 6 seat part 7 cylindrical member 8 cylindrical member 9 hole 10 valve body 11 seal material 12 arm 13 projecting member 51 Control valve 52 Stop valve 53 Valve chamber 54 Control valve stem 55 Stop valve stem 56 Hole 57 Control valve drive mechanism 58 Stop valve drive mechanism 59 Link mechanism (for stop valve) 60 Link mechanism (for control valve) 61 Pressure control valve 62 Hydraulic Cylinder 63 Hydraulic Cylinder Chamber 64 Emergency Valve 65 Tripping Pipe 66 Adjusting Valve Closing Spring 67 Drain 68 Hydraulic Power Source 69 Drain Pipe 70 Through Hole 71 Valve Body Upper Room 72 Emergency Valve Body 73 Emergency Valve Spring 74 Drain 75 Adjusting Valve 76 Adjustable valve parent valve 77 Adjustable valve stem valve 78a Parent valve vertical hole 78b Parent valve side hole 79 Stop valve 80 Stop valve parent valve 80a Parent valve vertical hole 80b Parent valve side hole 81 Because the valve member valve S steam

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) F16K 31/44 F16K 31/44 D // F16K 31/122 31/122 (72) Inventor Toshiya Nishimura Hyogo 2-1-1, Aramachi-cho, Niihama, Takasago City, Japan Mitsubishi Heavy Industries, Ltd. Takasago Works (72) Inventor Mori Atsushi 2-1-1, Araimachi, Niihama, Takasago-shi, Hyogo F-term in Mitsubishi Heavy Industries, Ltd. Takasago Works 3G071 BA00 BA22 CA03 CA09 DA02 DA05 DA15 EA04 FA03 FA05 HA04 3H052 AA01 BA02 BA25 BA35 CA03 CA04 CA13 DA01 EA05 3H056 AA03 BB05 BB22 BB32 BB50 CA01 CC06 CC11 CD02 EE01 GG02 GG07 3H063 AA01 BB08 BB22 BB08 BB08 BB08 BB08 BB08 BB08 BB08 BB08 BB08 BB08 BB08 BB08 BB22

Claims (8)

[Claims] 1. A steam valve comprising: a stop valve for shutting off a flow of steam into a steam turbine; and a regulating valve for controlling a flow rate of the steam according to the steam turbine load.
A stop valve and an adjustment valve housed in the valve chamber and formed integrally with each other, and a base end portion is fixed to a central portion of the stop valve and the adjustment valve, respectively, to operate the stop valve. One of the control valve stems that opens and closes the control valve has a hollow structure, the other of which is inserted into the hollow structure, and whose tip projects outward from the same hole formed in the valve chamber. A steam valve, comprising: a rod; and a drive mechanism including a stop valve drive mechanism and a control valve drive mechanism that are respectively connected to a distal end of the valve rod and that can open and close the stop valve and the control valve. 2. Steam flowing through a gap formed between the inner periphery of the hollow valve stem and the outer periphery of the valve stem inserted into the hollow structure is directed to the outer periphery of the hollow stem. Between the through hole to be discharged, the steam discharged from the through hole, the outer periphery of the hollow valve stem, and the inner periphery of the hole formed in the valve chamber for projecting the two valve stems to the outside. 2. A steam valve according to claim 1, further comprising a drain pipe for preventing steam from leaking to the outside from a gap formed in the steam valve. 3. The stop rod having a base end portion fixed to a center portion of the stop valve, a shaft center portion having a hollow structure for operating the stop valve, and a base end portion comprising: 2. The steam valve according to claim 1, further comprising the control valve valve rod fixed to a central portion of the control valve and inserted into the hollow structure to operate the control valve. 4. The pressure control valve according to claim 2, wherein the control valve drive mechanism includes an emergency valve capable of closing the control valve even when a failure occurs in the pressure control valve of the control valve drive mechanism that drives the control valve. The steam valve according to claim 3, wherein the steam valve is provided in a flow path that connects the hydraulic cylinder and the drain in parallel. 5. The control valve has a main valve vertical hole through which a base end of the control valve stem is inserted, and a main valve lateral hole which communicates with the valve chamber is formed in a side wall. A base end portion of the control valve master valve and the control valve stem penetrating the master valve vertical hole is fixed to an upper surface axis portion, and operates inside the control valve master valve by the driving force of the control valve drive mechanism. The steam valve according to claim 3, further comprising a control valve element that operates the control valve main valve. 6. The control valve stem having a base end portion fixed to a central portion of the control valve, a shaft center portion having a hollow structure for operating the control valve, and a base end portion. 2. The steam valve according to claim 1, wherein the stop valve is fixed to a central portion of the stop valve and is inserted into the hollow structure to operate the stop valve. 7. The control valve has an operation space in which the stop valve can be operated independently, and the control valve and the control valve can be operated independently even when a malfunction occurs in a hydraulic cylinder of the control valve drive mechanism. 7. The steam valve according to claim 6, wherein the stop valve is operated without interference, and the steam to the steam turbine side can be shut off by the stop valve. 8. A stop valve main valve, wherein the stop valve has a main valve vertical hole formed at an axis thereof for inserting a base end of the stop valve stem, and a base end of the stop valve stem is formed on an upper surface. Fixed to the shaft center,
The steam valve according to claim 6, further comprising a stop valve element that operates the stop valve parent valve by operating the inside of the stop valve parent valve by the driving force of the stop valve driving mechanism.