JP2016114023A - Steam valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam valve device capable of preventing a valve lift plate from being curved due to heat deformation.SOLUTION: A steam valve device for adjusting a steam amount supplied to a steam turbine includes: a valve housing that has a valve chamber and which first to fourth valve ports are disposed in series so as to face the valve chamber; first to fourth valve bodies that are provided in the valve chamber, and can contact/separate from/with the first to fourth ports respectively; first to fourth valve rods that are connected to the first to fourth valve bodies respectively; a first valve lift plate that is provided in the valve chamber, and lifts the first valve rod and the second valve rod so as to separate the first valve body and the second valve body from the first valve port and the second valve port respectively; and a second valve lift plate that is provided in the valve chamber, and lifts the third valve rod and the fourth valve rod so as to separate the third valve body and the fourth valve body from the third valve port and the fourth port respectively.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a steam valve device.

  A steam valve device for adjusting the amount of steam supplied to a steam turbine is configured to be able to contact and separate from a valve housing having a valve chamber and a plurality of valve ports provided in the valve chamber and formed in the valve chamber. In general, a valve having a plurality of valve bodies and a plurality of valve rods respectively connected to the plurality of valve bodies is used. In such a steam valve device, the amount of steam is adjusted by moving the valve stem by an actuator and changing the flow path area between the valve seat and the valve body.

  Some of the above-described steam valve devices include a valve lifting plate configured to lift a plurality of valve rods so that each of a plurality of valve bodies is separated from a corresponding valve port. In this type of steam valve device, a plurality of valve bodies can be brought into contact with and separated from the valve port by raising and lowering a single valve lifting plate, so the flow rate of steam supplied to the steam turbine with a simple configuration Can be adjusted.

  An example of such a steam valve device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-257716 filed by the present applicant.

JP 2000-257716 A

  In recent years, with the increase in the size of a steam turbine, the valve housing and valve lift plate provided in the steam valve device tend to increase in size. When the valve lifting plate is enlarged, the temperature distribution of the valve lifting plate is likely to be non-uniform, and the valve lifting plate is easily bent due to thermal deformation. If the valve lift plate bends due to the effect of thermal deformation, the valve stem may tilt, causing uneven wear and vibration in the valve stem and valve body, which may affect the life of the steam valve device and the adjustment of the steam volume. .

  In this regard, Patent Document 1 does not disclose any knowledge about how to configure the steam valve device in order to suppress the bending of the valve lift plate due to the influence of the thermal deformation described above.

  In view of the circumstances described above, at least one embodiment of the present invention aims to provide a steam valve device capable of suppressing the bending of the valve lift plate due to the influence of thermal deformation.

  (1) A steam valve device according to at least one embodiment of the present invention is a steam valve device for adjusting the amount of steam supplied to a steam turbine. The steam valve device has a valve chamber and faces the valve chamber. A valve housing in which fourth valve ports are arranged in series; first to fourth valve bodies that are provided in the valve chamber and configured to be able to contact and separate from the first to fourth valve ports; , First to fourth valve rods respectively connected to the first to fourth valve bodies, and provided in the valve chamber, the first valve body and the second valve body are connected to the first valve port and the second valve body. A first valve lifting plate for lifting the first valve rod and the second valve rod so as to be spaced apart from the valve ports; and a third valve body and the fourth valve body provided in the valve chamber. The third valve rod and the fourth valve are spaced apart from the third valve port and the fourth valve port, respectively. A second valve lift plate for lifting the rod; and at least one provided outside the valve chamber and configured to generate a driving force for lifting the first valve lift plate and the second valve lift plate An actuator, and at least one transmission member provided from outside the valve chamber to the valve chamber for transmitting the driving force of the actuator to the first valve lifting plate and the second valve lifting plate.

  According to the steam valve device described in (1) above, the first valve rod and the second valve rod are lifted by the first valve lift plate, and the third valve rod and the fourth valve rod are lifted by the second valve lift plate. Therefore, the length of each valve lifting plate can be shortened as compared with the case where the first to fourth valve rods are lifted by one valve lifting plate. For this reason, the bending of the valve lifting plate due to thermal deformation can thereby be suppressed. Therefore, the inclination of the valve stem due to the bending of the valve lift plate is suppressed, and uneven wear and vibration of the valve stem and the valve body are suppressed. As a result, the life of the steam valve device can be increased and the amount of steam can be finely adjusted.

  (2) In some embodiments, in the steam valve device according to (1), the first valve may further include a partition wall that partitions the valve chamber into a first valve chamber portion and a second valve chamber portion. The port and the second valve port are disposed facing the first valve chamber portion, the third valve port and the fourth valve port are disposed facing the second valve chamber portion, and the partition The wall is formed with at least one opening that communicates the first valve chamber and the second valve chamber.

  According to the steam valve device described in (2) above, the deformation of the valve chamber is suppressed by increasing the rigidity of the valve chamber by the partition wall that partitions the valve chamber into the first valve chamber portion and the second valve chamber portion. be able to. In addition, since at least one opening that communicates the first valve chamber and the second valve chamber is formed in the partition wall, a steam passage between the first valve chamber and the second valve chamber is formed. The deformation of the valve chamber can be suppressed while ensuring with a simple configuration.

  (3) In some embodiments, in the steam valve device according to (2) above, from the central position of the partition wall in the height direction of the valve chamber among the openings formed in the partition wall. In addition, the openings are formed such that the total opening area S1 of the portions located below is greater than the total opening area S2 of the portions located above the central position.

  According to the steam valve device described in the above (3), a smoother steam flow to all the valve ports provided at the bottom of the valve chamber can be realized.

  (4) In some embodiments, in the steam valve device according to the above (3), the thickness of the partition wall approaches the inner peripheral wall at a connection portion between the partition wall and the inner peripheral wall of the valve chamber. It increases as

  According to the steam valve device described in the above (4), the thickness of the partition wall increases at the connection portion between the partition wall and the inner peripheral wall of the valve chamber as it approaches the inner peripheral wall. Can be suppressed.

  (5) In some embodiments, the steam valve device according to the above (2) to (4) further includes at least one opening / closing member configured to open and close the at least one opening.

  According to the steam valve device described in (5) above, it can be easily adjusted by the communication state between the first valve chamber portion and the second valve chamber portion and the opening / closing member. For example, if all the openings are closed by the opening / closing members, the first valve chamber and the second valve chamber are not in communication with each other. Steam can flow only to the part. If all the openings are opened, the first valve chamber and the second valve chamber are in communication with each other, so that steam can flow through both the first valve chamber and the second valve chamber. . For this reason, with a simple configuration, it is possible to facilitate the flow rate adjustment of the steam while suppressing deformation of the valve chamber.

  (6) In some embodiments, in the steam valve device according to (5), the first to fourth valve ports are arranged in series along a longitudinal direction of the valve chamber, and the valve housing Includes a plurality of discharge passages for discharging the steam that has passed through the first to fourth valve ports to the outside of the valve housing, and at least one of the plurality of discharge passages includes the first to fourth passages. A communication path configured to connect any two of the valve ports so as to merge the steam that has passed through any two of the valve ports adjacent to each other is provided.

  According to the steam valve device described in (6) above, at least one of the plurality of discharge passages is “to merge the steam that has passed through any two of the first to fourth valve ports adjacent to each other”. , A communication path configured to communicate any two valve ports ”, and therefore, when one discharge path is provided for each valve port (the steam that has passed through the first valve port to the fourth valve port) Compared with the case of discharging each of the four discharge paths, the distance between the two valve ports that communicate with each other through the communication path can be easily reduced by reducing the number of flow path walls that partition the discharge paths. For this reason, it becomes easy to shorten the valve chamber in the longitudinal direction, and the bending of the valve chamber due to the influence of thermal deformation can be suppressed. Therefore, the inclination of the valve stem due to the bending of the valve chamber is suppressed, and uneven wear and vibration of the valve stem and the valve body are suppressed. As a result, the life of the steam valve device can be increased and the amount of steam can be finely adjusted.

  (7) In some embodiments, in the steam valve device according to the above (6), the communication path connects one of the two valve ports to one of the two valve ports. Including one side of a communication path extending to a merge position where the steam that has passed merges, and the other side of the communication path extending from the other valve port to the merge position of the two valve ports, One valve port is adjacent to any one of the first to fourth valve ports in addition to the other valve port, and the one side portion of the communication path moves toward the downstream side in the steam flow direction. It is provided so as to be separated from any one of the first to fourth valve ports in the longitudinal direction of the valve chamber.

  According to the steam valve device of the above (7), any one of the first to fourth valve ports (the above) in the longitudinal direction of the valve chamber as the one side portion of the communication path goes downstream in the steam flow direction. In addition to the other valve port, the one valve port is provided so as to be separated from the adjacent port), so that any one of the first to fourth valve ports and the one valve port It becomes easy to narrow the interval. For this reason, the effect described in the above (6) (the effect of suppressing the bending of the valve chamber due to the influence of thermal deformation by shortening the valve chamber in the longitudinal direction) can be enhanced.

  (8) In some embodiments, in the steam valve device according to any one of (1) to (7), the transmission member is provided from outside the valve chamber to the valve chamber, A first transmission member for transmitting the driving force of the actuator to the first valve lifting plate, and provided from the outside of the valve chamber to the valve chamber, and transmits the driving force of the actuator to the second valve lifting plate. A second transmission member.

  According to the steam valve device described in (8) above, the first transmission member for transmitting the driving force to the first valve lifting plate and the second transmission member for transmitting the driving force to the second valve lifting plate. Therefore, the first valve lifting plate and the second valve lifting plate can be moved up and down at the same time if the transmission timings of the driving forces by the first and second transmission members are made to coincide with each other. The valve lift plate and the second valve lift plate can be raised and lowered at different timings. For this reason, compared with the case where the 1st-4th valve lifting rod is lifted with one valve lifting plate, the design freedom of the structure for adjusting a steam flow rate can be raised.

  (9) In some embodiments, in the steam valve device according to the above (2) to (8), the valve housing is mounted on a turbine casing included in the steam turbine, and is integrated with the turbine casing. It is configured.

  As described in the above (9), when the valve housing is mounted on the turbine casing provided in the steam turbine, the amount of thermal expansion of the valve chamber on the steam turbine side is relatively large. The bend is particularly likely to be large. Even in such a case, bending of the valve chamber due to thermal deformation can be suppressed by the configuration described in the above (2) to (8).

  In some embodiments, one of the purposes is to provide a steam valve device that can suppress the bending of the valve lift plate due to the influence of thermal deformation, but in some embodiments, Another object of the present invention is to provide a steam valve device that can suppress the bending of the valve chamber due to the influence of thermal deformation.

  In this case, (10) the steam valve device according to at least one embodiment of the present invention is a steam valve device for adjusting the amount of steam supplied to the steam turbine, and has a valve chamber and faces the valve chamber. First to third valve ports arranged in series and the first to third valves provided in the valve chamber and configured to be able to contact and separate from the first to third valve ports, respectively. A valve body, connected to the first to third valve bodies, respectively, first to third valve rods extending from the valve chamber to the outside of the valve chamber; provided outside the valve chamber; At least one actuator configured to generate a driving force for lifting the third valve stem, and the first to third valve ports are arranged in series along the longitudinal direction of the valve chamber. And the valve housing is steam that has passed through the first to third valve ports. A plurality of discharge paths for discharging to the outside of the valve housing, wherein at least one of the plurality of discharge paths passes through any two of the first to third valve ports adjacent to each other; A communication path configured to connect any two of the valve ports so as to join the steam.

  According to the steam valve device described in (10) above, when one discharge path is provided for each valve port (the steam passing through the first valve port to the third valve port is discharged through the three discharge paths, respectively. Compared with the case where the number of discharge paths is reduced by reducing the number of discharge paths, the distance between the two valve ports that communicate with each other can be reduced by reducing the number of flow path walls separating the discharge paths. It becomes easy. For this reason, it becomes easy to shorten the valve chamber in the longitudinal direction, and the bending of the valve chamber due to the influence of thermal deformation can be suppressed. Therefore, the inclination of the valve stem due to the bending of the valve chamber is suppressed, and uneven wear and vibration of the valve stem and the valve body are suppressed. As a result, the life of the steam valve device can be increased and the amount of steam can be finely adjusted.

  (11) In some embodiments, in the steam valve device according to the above (10), the communication path connects the two valve ports from one of the two valve ports. Including one side of a communication path that extends to a merging position where steam that has passed merges, and the other side of a communication path that extends from the other valve port to the merging position of any two valve ports, One valve port is adjacent to any one of the first to third valve ports in addition to the other valve port, and the one side portion of the first communication path is directed downstream in the steam flow direction. Accordingly, the valve chamber is provided so as to be separated from any one of the first to third valve ports in the longitudinal direction of the valve chamber.

  According to the steam valve device of the above (11), as the one side portion of the communication path goes to the downstream side in the steam flow direction, the adjacent valve port (the valve port adjacent to the valve port connected to the one side portion of the communication path) The valve connected to the other side of the communication path is separated from the valve port in the longitudinal direction of the valve chamber. It becomes easy to shorten the valve chamber by narrowing the distance from the port. This is particularly effective when the flow path area of the discharge path increases toward the downstream side from the viewpoint of steam discharge performance.

  According to at least one embodiment of the present invention, there is provided a steam valve device that can suppress bending of a valve lift plate due to the influence of thermal deformation.

It is sectional drawing which shows roughly the whole structure of the steam valve apparatus which concerns on one Embodiment. It is a figure which shows an example of the AA cross section in the steam valve apparatus shown in FIG. It is a figure which shows an example of the BB cross section of the steam valve apparatus shown in FIG. It is sectional drawing which shows roughly the whole structure of the steam valve apparatus which concerns on one Embodiment. It is sectional drawing which shows roughly the whole structure of the steam valve apparatus which concerns on one Embodiment. It is a figure which shows an example of CC cross section in the steam valve apparatus shown in FIG. It is a figure which shows another example of CC cross section of the steam valve apparatus shown in FIG. It is a schematic diagram for demonstrating the definition of total S1 and S2 of opening area. It is an expanded sectional view which shows the structural example of the connection part vicinity of the internal peripheral wall and partition wall of a valve chamber. It is an expanded sectional view which shows the structural example of the connection part vicinity of the internal peripheral wall and partition wall of a valve chamber. It is sectional drawing which shows the state in which the opening part is open | released when providing an opening-and-closing member in an opening part. It is sectional drawing which shows the state in which the opening part is closed when the opening-and-closing member is provided in the opening part. It is sectional drawing which shows roughly the whole structure of the steam valve apparatus which concerns on a comparative example. It is sectional drawing which shows roughly the whole structure of the steam valve apparatus which concerns on one Embodiment. It is a figure which shows an example of the DD cross section in the steam valve apparatus shown in FIG. It is sectional drawing which shows roughly the whole structure of the steam valve apparatus which concerns on a comparative example.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

  FIG. 1 is a cross-sectional view schematically showing an overall configuration of a steam valve device 100a according to an embodiment. FIG. 2 is a diagram illustrating an example of an AA cross section in the steam valve device 100a illustrated in FIG. FIG. 3 is a view showing an example of a BB cross section of the steam valve device 100a shown in FIG. FIG. 4 is a cross-sectional view schematically showing the overall configuration of the steam valve device 100b according to an embodiment. FIG. 5 is a cross-sectional view schematically showing the overall configuration of the steam valve device 100c according to an embodiment. FIG. 6 is a view showing an example of a CC cross section in the steam valve device 100b shown in FIG. FIG. 7 is a view showing another example of the CC cross section of the steam valve device 100b shown in FIG.

  The steam valve device 100 (100a to 100c) according to some embodiments shown in FIGS. 1 to 7 is a steam valve device for adjusting the amount of steam supplied to the steam turbine 200. For example, as shown in FIGS. 1, 4, and 5, the steam valve device 100 (100 a to 100 c) includes a valve housing 4, a plurality of valve bodies 8, a plurality of valve rods 10, and a plurality of valve lifting plates 16. One actuator 18 and at least one transmission member 20 are provided.

  In some embodiments, as shown, for example, in FIGS. 1, 2, 4 and 5, the valve housing 4 has a valve chamber 2 that faces the valve chamber 2. A plurality of valve ports 6 are arranged in series along the longitudinal direction of the valve chamber 2. In FIG. 1, FIG. 4 and FIG. 5, the steam flowing into the valve chamber 2 through the inlet port 22 of the valve housing 4 passes through the plurality of outlet ports 24 of the valve housing 4 through the plurality of valve ports 6. Supplied to. In the steam valve device 100 (100a to 100c), the steam amount of the plurality of valve bodies 8 is adjusted by adjusting the lift amount from the corresponding valve port 6 (the flow path area between the valve port 6 and the valve body 8). The amount of steam supplied to the turbine 200 is adjusted. In the steam valve device 100 (100a to 100c) shown in FIGS. 1 to 7, the valve housing 4 has first to fourth valve ports 6 (first valve port 6a and second valve port facing the valve chamber 2). 6b, the third valve port 6c and the fourth valve port 6d) are arranged in series along the longitudinal direction of the valve chamber 2.

  In some embodiments, for example, as shown in FIGS. 1, 2, 4, and 5, the plurality of valve bodies 8 include first to fourth valve bodies 8 (first valve body 8 a, second valve body). 8b, a third valve body 8c and a fourth valve body 8d). The 1st-4th valve body 8 is provided in the valve chamber 2, and is comprised so that contact / separation with respect to the 1st-4th valve port 6 is each possible. That is, the first valve body 8a is configured to be able to contact and separate from the first valve port 6a, the second valve body 8b is configured to be able to contact and separate from the second valve port 6b, and the third valve body 8c is configured to be third. The fourth valve body 8d is configured to be able to contact and separate with respect to the fourth valve port 6d.

  In some embodiments, for example, as shown in FIGS. 1, 4, and 5, the plurality of valve stems 10 includes first to fourth valve stems 10 (first valve stem 10 a, second valve stem 10 b, first 3 valve stem 10c and 4th valve stem 10d). The first to fourth valve rods 10 are respectively connected to the first to fourth valve bodies 8. That is, the first valve rod 10a is connected to the first valve body 8a, the second valve rod 10b is connected to the second valve body 8b, the third valve rod 10c is connected to the third valve body 8c, and the fourth valve The rod 10d is connected to the fourth valve body 8d.

  In some embodiments, for example, as shown in FIGS. 1, 3, 4 and 5, the plurality of valve lift plates 16 includes a first valve lift plate 16a and a second valve lift plate 16b. The first valve lift plate 16a is provided in the valve chamber 2, and the first valve rod 10a is configured to separate the first valve body 8a and the second valve body 8b from the first valve port 6a and the second valve port 6b, respectively. And the 2nd valve rod 10b is comprised so that a lift is possible. The second valve lift plate 16b is provided in the valve chamber 2, and the third valve rod 10c is configured to separate the third valve body 8c and the fourth valve body 8d from the third valve port 6c and the fourth valve port 6d, respectively. And the 4th valve rod 10d is comprised so that a lift is possible.

  In some embodiments, for example, as shown in FIGS. 1, 4, and 5, each of the valve lift plates 16 is provided with a plurality of through holes 30. Each of the valve stems 10 is provided through each of the through holes 30, and has a large diameter having a diameter larger than the diameter of the through hole 30 on the opposite side of the valve body 8 across each of the through holes 30. Part 32 is included. In this configuration, when the valve lift plate 16 is lifted, the valve lift plate 16 comes into contact with the large diameter portion 32 of the corresponding valve stem 10. And the valve body 8 is lifted.

  In some embodiments, for example, as shown in FIGS. 1, 4, and 5, the axial length L of the portion between the large diameter portion 32 and the valve body 8 in the plurality of valve rods 10 is set for each valve rod. It may be different. Thereby, it becomes possible to make the raising timings of the plurality of valve rods 10 different, and the flow rate of the steam supplied to the steam turbine 200 can be finely adjusted with a simple configuration. The large-diameter portion 32 may be formed integrally (with one member) with the rod of the valve rod 10 or may be formed separately (with another member). When formed separately, for example, the large-diameter portion 32 may be a nut that is screwed with a screw portion provided on the bar.

  In some embodiments, for example, as shown in FIGS. 1, 4 and 5, at least one actuator 18 is provided outside the valve chamber 2 and includes a first valve lifting plate 16 a and a second valve lifting plate 16 b. It is configured to generate a driving force for lifting.

  In some embodiments, for example, as shown in FIGS. 1, 4, and 5, at least one transmission member 20 is provided from the outside of the valve chamber 2 to the inside of the valve chamber 2 to increase the driving force of the actuator 18. It is comprised so that it may transmit to the 1st valve lift plate 16a and the 2nd valve lift plate 16b.

  According to the steam valve device 100 (100a to 100c) described above, the first valve rod 10a and the second valve rod 10b are lifted by the first valve lift plate 16a, and the third valve rod 10c and the fourth valve rod 10d are moved to the second valve rod 10d. Since the first valve lifter 10 is lifted by one valve lifter plate 16 (see FIG. 12), the valve lifter plate in the longitudinal direction of the valve chamber 2 is lifted by the two valve lifter plate 16b. The length per 16 sheets can be shortened. Thereby, the bending of the valve lifting plate 16 due to thermal deformation can be suppressed. Therefore, the inclination of each valve stem 10 resulting from the bending of the valve lift plate 16 is suppressed, and uneven wear and vibration of each valve stem 10 and each valve body 8 are suppressed. For this reason, while extending the life of the steam valve device 100 (100a to 100c), it is possible to finely adjust the amount of steam.

  In some embodiments, for example, as shown in FIGS. 1, 4, and 5, at least one transmission member 20 is provided from the outside of the valve chamber 2 to the inside of the valve chamber 2 to increase the driving force of the actuator 18. A first transmission member 20a for transmitting to the first valve lifting plate 16a, and provided from the outside of the valve chamber 2 to the inside of the valve chamber 2, for transmitting the driving force of the actuator 18 to the second valve lifting plate 16b. Second transmission member 20b.

  Accordingly, the first transmission member 20a for transmitting the driving force to the first valve lifting plate 16a and the second transmission member 20b for transmitting the driving force to the second valve lifting plate 16b are provided. The first valve lifting plate 16a and the second valve lifting plate 16b can be moved up and down at the same time if the transmission timings of the driving forces by the second transmission members 20a and 20b are made to coincide with each other. The plate 16a and the second valve lifting plate 16b can be raised and lowered at different timings. For this reason, compared with the case where the 1st-4th valve lifting rod 10 is lifted with one valve lifting plate 16 (refer to Drawing 12), the design flexibility of the composition for adjusting a steam flow rate can be raised. it can.

  In some embodiments, for example, as shown in FIGS. 1, 4, and 5, the at least one actuator 18 includes a first actuator 18a and a second actuator 18b. The first transmission member 20a is a first lift rod configured to lift the first valve lifting plate 16a using the driving force of the first actuator 18a, and the second transmission member 20b is the second actuator 18b. It is the 2nd lift stick | rod comprised so that the 2nd valve lift plate 16b might be lifted using a driving force.

  According to the steam valve device 100a shown in FIGS. 1 to 4, the first valve body 8a and the second valve corresponding to the first valve rod 10a are moved up and down by the first lift rod 20a. The second valve body 8b corresponding to the rod 10b can be brought into contact with and separated from the first valve port 6a and the second valve port 6b. Further, by moving the second valve lifting plate 16b up and down by the second lift rod 20b, the third valve body 8c corresponding to the third valve rod 10c and the fourth valve body 8d corresponding to the fourth valve rod 10d are moved to the third position. The valve port 6c and the fourth valve port 6d can be brought into and out of contact with each other.

  In some embodiments, for example, as shown in FIGS. 1, 4, and 5, the valve housing 4 includes a plurality of valves for discharging steam that has passed through the first to fourth valve ports 6 to the outside of the valve housing 4. And at least one of the plurality of discharge paths 26 is configured to join the steam that has passed through any two of the first to fourth valve ports 6 adjacent to each other. It has a communication path 28 configured to communicate any two valve ports 6. In addition, the discharge path 26 is comprised so that a flow-path area may become large as it goes downstream from a viewpoint of the discharge | emission property of steam.

  In the steam valve device 100 (100a, 100c) shown in FIGS. 1 and 5, the plurality of discharge passages 26 discharge steam that has passed through the first valve port 6a and the second valve port 6b to the outside of the valve housing 4. And a discharge passage 26 b for discharging the steam that has passed through the third valve port 6 c and the fourth valve port 6 d to the outside of the valve housing 4. Here, the discharge passage 26a is configured to connect the first valve port 6a and the second valve port 6b so that the steam that has passed through the first valve port 6a and the second valve port 6b adjacent to each other is merged. A communication path 28 (28a) is provided. Further, the discharge path 26b is a communication path 28 (28b) that connects the third valve port 6c and the fourth valve port 6d so that the steam that has passed through the third valve port 6c and the fourth valve port 6d adjacent to each other is merged. ).

  In the steam valve device 100 (100b) shown in FIG. 4, the plurality of discharge paths 26 include a discharge path 26a for discharging the steam that has passed through the first valve port 6a to the outside of the valve housing 4, and a second valve. A discharge path 26b for discharging the steam that has passed through the port 6b and the third valve port 6c to the outside of the valve housing 4, and a discharge path for discharging the steam that has passed through the fourth valve port 6d to the outside of the valve housing 4 26c. Among the plurality of discharge paths 26, the discharge path 26b communicates the second valve port 6b and the third valve port 6c so that the steam that has passed through the second valve port 6b and the third valve port 6c adjacent to each other is merged. A communication path 28 (28c) is provided.

  In the steam valve device 100 (100a, 100b, 100c) shown in FIGS. 1, 4 and 5, when one discharge path 26 is provided for each valve port 6 (first valve port 6a to fourth valve). When the steam that has passed through the port 6d is discharged through the four discharge paths 26 (see FIG. 12), the communication paths 28 are provided to reduce the number of the discharge paths 26, thereby separating the discharge paths 26 from each other. Since the flow path wall 54 can be reduced, the interval between the two valve ports 6 that communicate with each other through the communication path 28 can be easily reduced. For this reason, it becomes easy to shorten the valve chamber 2 in the longitudinal direction, and the bending of the valve chamber 2 due to the influence of thermal deformation can be suppressed. Therefore, the inclination of the valve stem 10 due to the bending of the valve chamber 2 is suppressed, and uneven wear and vibration of the valve stem 10 and the valve body 8 are suppressed. As a result, the life of the steam valve device 100 can be increased and the amount of steam can be finely adjusted.

  In some embodiments, for example, as shown in FIGS. 1, 4 and 5, the communication path 28 extends from one valve port 6 of the two valve ports 6 communicated by the communication path 28. One side portion 46 of the communication path extending to the merge position where the steam that has passed through the valve port 6 merges, and the other side portion of the communication path extending from the other valve port 6 to the merge position of the two valve ports 6 48. The one valve port 6 is adjacent to any one of the first to fourth valve ports 6 in addition to the other valve port 6, and the communication path one side portion 46 is located downstream in the steam flow direction. It is provided so that it may leave | separate from the said any one of the 1st-4th valve port 6 in the longitudinal direction of the valve chamber 2 as it goes.

  Specifically, for example, in the steam valve device 100 (100a, 100c) shown in FIGS. 1 and 5, the communication path 28 (28a) is connected to two valve ports 6a, 6b that communicate with each other through the communication path 28 (28a). One side port portion 46a extending from one of the valve ports 6b to the joining position where the steam that has passed through the two valve ports 6a and 6b joins, and the other valve port 6a of the two valve ports 6 And the other side portion 48a of the communication path extending from the merging position to the merging position. And the communication path one side part 46a is provided so that it may leave | separate from the 3rd valve port 6c in the longitudinal direction of the valve chamber 2 toward the downstream of a steam flow direction. Further, in the communication path 28 (28b), the steam that has passed through the two valve ports 6c and 6d joins from one of the two valve ports 6c and 6d that communicate with each other through the communication path 28 (28b). A communication path one side portion 46b extending to the merging position, and a communication path other side portion 48b extending from the other valve port 6d of the two valve ports 6 to the merging position. And the 1st connection path one side part 46b is provided so that it may leave | separate from the 2nd valve port 6b in the longitudinal direction of the valve chamber 2 as it goes to the steam flow direction downstream.

  Further, for example, in the steam valve device 100 (100b) shown in FIG. 4, the communication path 28 (28c) is connected to the two valve ports 6b and 6c communicated by the communication path 28c from one valve port 6b. One side 46c of the communication path that extends to the merge position where the steam that has passed through the valve ports 6b and 6c merges, and the other of the communication path that extends from the other valve port 6c of the two valve ports 6 to the merge position. Side part 48c. The first connecting path one side portion 46c is provided so as to be separated from the first valve port 6a in the longitudinal direction of the valve chamber 2 toward the downstream side in the steam flow direction. Further, the other side portion 48c of the communication path is provided so as to be separated from the fourth valve port 6d in the longitudinal direction of the valve chamber 2 toward the downstream side in the steam flow direction.

  In the steam valve device 100 (100a to 100c) shown in FIG. 1, FIG. 4 and FIG. 5, the adjacent valve port 6 (communication path one side portion) becomes closer to the downstream side in the steam flow direction. 46, the valve port 6 adjacent to the valve port to which the valve 46 is connected is provided so as to be separated in the longitudinal direction of the valve chamber 2 from the valve port different from the valve port to which the communication path other side 48 is connected. It is easy to shorten the valve chamber 2 by narrowing the interval between the adjacent valve port 6 and the valve port 6 to which the communication path one side 46 is connected. This is particularly effective when the flow path area of the discharge path 26 becomes larger toward the downstream side from the viewpoint of steam discharge performance.

  In some embodiments, for example, as shown in FIG. 5, the steam valve device 100 (100b) further includes a partition wall 12 that partitions the valve chamber 2 into a first valve chamber portion 2a and a second valve chamber portion 2b. ing. In this case, the first valve port 6a and the second valve port 6b are arranged facing the first valve chamber portion 2a, and the third valve port 6c and the fourth valve port 6d face the second valve chamber portion 2b. Arranged. The partition wall 12 is formed with at least one opening 14 that communicates the first valve chamber 2a and the second valve chamber 2b.

  Thus, the deformation of the valve chamber 2 can be suppressed by increasing the rigidity of the valve chamber 2 by the partition wall 12 that partitions the valve chamber 2 into the first valve chamber portion 2a and the second valve chamber portion 2b. Further, since at least one opening 14 that communicates the first valve chamber 2a and the second valve chamber 2b is formed in the partition wall 12, the first valve chamber 2a and the second valve chamber 2b The deformation | transformation of the valve chamber 2 can be suppressed, ensuring the vapor | steam passage between between with a simple structure.

  The number and positions of the openings 14 are not particularly limited. For example, as shown in FIG. 6, the central position Mh of the partition wall 12 in the height direction of the valve chamber 2 and the width direction of the valve chamber 2 (valve chamber 2 One opening 14 may be provided at the center position Mw of the partition wall 12 in the direction perpendicular to each of the longitudinal direction and the height direction.

  For example, a plurality of openings 14 may be provided as shown in FIG. 7A. The plurality of openings 14 shown in FIG. 7A include first to third openings 14 (including a first opening 14a, a second opening 14b, and a third opening 14c. As shown in FIG. Of all the openings 14a to 14c provided in the valve chamber 2, the total S1 of the opening areas (channel cross-sectional areas) of the portions located below the center position Mh of the partition wall 12 in the height direction of the valve chamber 2 is Each opening part 14 may be provided so that it may become larger than total S2 of the opening area (flow-path cross-sectional area) of the part located above this center position Mh, Thereby, the bottom part 34 of the valve chamber 2 A smoother flow of steam to all the valve ports 6a to 6d (see FIG. 5) provided in the center position Mh can be achieved, as shown in FIG. When it is provided from above to below, the 1 Of the lower portion is added to S1 from the central position Mh of the opening 14, and adding to S2 the upper portion than the center Mh out of the one opening 14.

  In some embodiments, for example, as shown in FIGS. 8 and 9, the thickness W of the partition wall 12 increases as it approaches the inner peripheral wall 36 at the connection portion 38 of the partition wall 12 with the inner peripheral wall 36 of the valve chamber 2. Increase. Thereby, a deformation | transformation of the valve chamber 2 can be suppressed effectively. Note that the connecting portion 38 may be provided with an R as shown in FIG. 8, for example, or may have an inclined surface 40 having a certain inclination as shown in FIG. Further, the partition wall 12 and the inner peripheral wall 36 of the valve chamber 2 may be integrally formed by casting, for example, or may be connected by bolts 42 or the like as shown in FIG.

  In some embodiments, for example, as shown in FIGS. 10 and 11, the steam valve device 100 (100 c) further includes at least one opening / closing member 44 configured to open and close at least one opening 14. . The opening / closing member 44 may be, for example, a shutter that opens and closes by a driving force transmitted from an actuator 18 c provided outside the valve chamber 2 via a transmission member (for example, a lift bar) 20 c.

  Thereby, the communication state of the 1st valve chamber part 2a and the 2nd valve chamber part 2b can be adjusted with the opening-and-closing member 44. FIG. For example, if all the openings 14 are closed by the opening / closing members 44, the first valve chamber portion 2a and the second valve chamber portion 2b are disconnected from each other, and the first valve chamber portion 2a and the second valve chamber portion 2b Steam can flow only in one valve chamber (the first valve chamber 2a in the embodiment shown in FIG. 5). If all the openings 14 are opened, the first valve chamber portion 2a and the second valve chamber portion 2b are in communication with each other, and steam flows through both the first valve chamber portion 2a and the second valve chamber portion 2b. be able to. For this reason, it is possible to facilitate the flow rate adjustment of the steam while suppressing the deformation of the valve chamber 2 with a simple configuration.

  In some embodiments, for example, as shown in FIGS. 1, 4, and 5, the valve housing 4 is mounted on a turbine casing 202 included in the steam turbine 200 and is configured integrally with the turbine casing 202. .

  As described above, when the valve housing 4 is mounted on the turbine casing 202 provided in the steam turbine 200, the amount of thermal expansion of the valve chamber 2 on the steam turbine 200 side is relatively large. The bend is particularly likely to be large. Therefore, in such a case, by providing the valve housing with a communication path that connects adjacent valve ports as described above, one discharge path 26 is provided for each valve port 6 (first valve). When the steam that has passed through the port 6a to the fourth valve port 6d is discharged through the four discharge passages 26 (see FIG. 12), the length of the valve chamber is shortened to reduce the length of the valve chamber due to thermal deformation. Bending can be suppressed.

  FIG. 13 is a steam valve device 300 for adjusting the amount of steam supplied to the steam turbine according to one embodiment.

  For example, as shown in FIG. 13, the steam valve device 300 includes a valve housing 4, a plurality of valve bodies 8, a plurality of valve rods 10, and at least one actuator 18.

  In one embodiment, as shown in FIGS. 13 and 14, the valve housing 4 has a valve chamber 2, and the valve housing 4 has a plurality of valve ports 6 facing the valve chamber 2. 2 are arranged in series along the longitudinal direction. In FIG. 13, the steam that has flowed into the valve chamber 2 via the inlet port 22 of the valve housing 4 is supplied to the steam turbine 200 from the plurality of outlet ports 24 of the valve housing 4 via the plurality of valve ports 6. In the steam valve device 300, the plurality of valve bodies 8 are supplied to the steam turbine 200 by adjusting the lift amount from the corresponding valve port 6 (the flow path area between the valve port 6 and the valve body 8). The amount of steam is adjusted.

  In one embodiment, as shown in FIGS. 13 and 14, the valve housing 4 of the steam valve device 300 has first to third valve ports 6 (first valve port 6 a, second valve facing the valve chamber 2. A valve port 6 b and a third valve port 6 c) are arranged in series along the longitudinal direction of the valve chamber 2. The plurality of valve bodies 8 are provided in the valve chamber 2 and are configured to be able to contact and separate from the first to third valve ports 6 respectively (first valve body 8a, first valve body 8a, second valve body 8). 2 valve body 8b and 3rd valve body 8c).

  In one embodiment, as shown in FIG. 13, the plurality of valve rods 6 are connected to the first to third valve bodies 8, respectively, and are provided from the inside of the valve chamber 2 to the outside of the valve chamber 2. It includes a third valve stem 10 (first valve stem 10a, second valve stem 10b, third valve stem 10c). The at least one actuator 18 is provided outside the valve chamber 2 and is configured to generate a driving force for lifting the first to third valve rods 10. In the exemplary embodiment shown in FIG. 13, the at least one actuator 18 includes first to third actuators 18 (first actuator 18a, second actuator 18b, and third actuator 18c), and the first to third actuators. 18 is configured to generate a driving force for lifting the first to third valve stems.

  In one embodiment, as shown in FIG. 13, the valve housing includes a plurality of discharge passages 26 for discharging the steam that has passed through the first to third valve ports 6 to the outside of the valve housing 4. At least one of the plurality of discharge passages 26 is configured such that any two of the first to third valve ports 6 join the two valve ports 6 adjacent to each other so as to join the steam. The communication path 28 is configured to communicate with each other. In addition, the discharge path 26 is comprised so that a flow-path area may become large as it goes downstream from a viewpoint of the discharge | emission property of steam.

  In one embodiment, as shown in FIG. 13, the plurality of discharge passages 26 include a discharge passage 26 a for discharging steam that has passed through the first valve port 6 a to the outside of the valve housing 4, a second valve port 6 b, And a discharge passage 26b for discharging the steam having passed through the third valve port 6c to the outside of the valve housing 4. Here, the discharge path 26b has a communication path 28 that connects the second valve port 6b and the third valve port 6c so that the steam that has passed through the second valve port 6b and the third valve port 6c adjacent to each other is merged. Have.

  In the steam valve device 300 shown in FIG. 13 and FIG. 14, when one discharge path 26 is provided for each valve port 6 (three discharges of steam passing through the first valve port 6a to the third valve port 6c). In the case of discharging each of the channels 26 (see FIG. 15), the communication channels 28 are provided and the number of the discharge channels 26 is reduced, so that the channel walls 54 partitioning the discharge channels 26 can be reduced. It is easy to narrow the interval between the two valve ports 6 communicating with each other through the passage 28. For this reason, it becomes easy to shorten the valve chamber 2 in the longitudinal direction, and the bending of the valve chamber 2 due to the influence of thermal deformation can be suppressed. Therefore, the inclination of the valve stem 10 due to the bending of the valve chamber 2 is suppressed, and uneven wear and vibration of the valve stem 10 and the valve body 8 are suppressed. As a result, the life of the steam valve device 300 can be extended and the amount of steam can be finely adjusted.

  In one embodiment, for example, as shown in FIG. 13, the communication path 28 connects the two valve ports 6 b, 6 c from one valve port 6 b of the two valve ports 6 b, 6 c communicated by the communication path 28. A communication path one side portion 46 extending to a merge position where the steam that has passed merges, and a communication path other side section 48 extending from the other valve port 6c to the merge position of the two valve ports 6b and 6c, including. The one valve port 6b is adjacent to one of the first to third valve ports 6 (valve port 6a) in addition to the other valve port 6c. As it goes downstream in the flow direction, the valve chamber 2 is provided so as to be separated from any one of the first to third valve ports 6 (the valve port 6a) in the longitudinal direction of the valve chamber 2.

  In the steam valve device 300 shown in FIG. 13, as the communication path one side portion 46 moves toward the downstream side in the steam flow direction, the adjacent valve port 6a (the valve adjacent to the valve port 6b to which the communication path one side portion 46 is connected). Among the ports 6a and 6c, the valve port 6a) which is different from the valve port 6c to which the communication path other side 48 is connected is provided so as to be separated in the longitudinal direction of the valve chamber 2, so that the adjacent valve port 6a It becomes easy to shorten the valve chamber 2 by narrowing the interval with the valve port 6b to which the communication path one side portion 46 is connected. This is particularly effective when the flow path area of the discharge path 26 becomes larger toward the downstream side from the viewpoint of steam discharge performance.

  The present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

  For example, in the embodiment shown in FIG. 4, of the first to fourth valve ports 6, the form in which only the second valve port 6 b and the third valve port 6 c are connected via the communication path 28 is exemplified. Only 6a and the second valve port 6b may be communicated via the communication path 28, or only the third valve port 6c and the fourth valve port 6d may be communicated via the communication path 28. That is, by connecting the valve ports 6 adjacent to each other among the first to fourth valve ports 6 through the communication path 28, the size in the longitudinal direction of the valve chamber 2 is reduced, and the valve chamber 2 is affected by the influence of thermal deformation. Bending can be suppressed.

  In the embodiment shown in FIG. 13, the form in which only the second valve port 6 b and the third valve port 6 c among the first to third valve ports 6 are connected via the communication path 28 is exemplified. Only 6a and the second valve port 6b may be communicated via the communication path 28. That is, by connecting the valve ports 6 adjacent to each other among the first to third valve ports 6 through the communication path 28, the size in the longitudinal direction of the valve chamber 2 is reduced, and the valve chamber 2 is affected by the influence of thermal deformation. Bending can be suppressed.

  Moreover, in the steam valve apparatus 100 (100a-100c) shown in FIGS. 1-11, the form in which the valve housing 4 has the four valve ports 6 is illustrated, and in the steam valve apparatus 300 shown in FIGS. Although the embodiment in which the valve housing 4 has three valve ports 6 is illustrated, the valve housing 4 may have five or more valve ports 6.

2 valve chamber 2a first valve chamber portion 2b second valve chamber portion 4 valve housing 6 valve port 6a first valve port 6b second valve port 6c third valve port 6d fourth valve port 8 valve body 8a first valve body 8b 2nd valve body 8c 3rd valve body 8d 4th valve body 10 Valve rod 10a 1st valve rod 10b 2nd valve rod 10c 3rd valve rod 10d 4th valve rod 12 Partition wall 14 Opening part 14a 1st opening part 14b 1st 2 opening part 14c 3rd opening part 16 valve lift plate 16a 1st valve lift plate 16b 2nd valve lift plate 18 actuator 18a 1st actuator 18b 2nd actuator 18c 3rd actuator 20 transmission member 20a 1st transmission member 20b 2nd transmission Member 22 Inlet port 24 Outlet port 26 Discharge path 26a 1st discharge path 26b 2nd discharge path 26 Connection path 28a 1st connection path 28b 2nd connection path 30 Through-hole 32 Large diameter 34 Bottom portion 36 Inner peripheral wall 38 Connection portion 40 Inclined surface 44 Opening / closing member 46 (46a, 46b, 46c) Connection path one side 48 (48a, 48b, 48c) Connection path other side 50 Channel wall 100 (100a, 100b, 100c) Steam valve device 200 Steam turbine 202 Turbine casing

Claims (9)

A steam valve device for adjusting the amount of steam supplied to a steam turbine,
A valve housing having a valve chamber and having first to fourth valve ports arranged in series facing the valve chamber;
First to fourth valve bodies provided in the valve chamber and configured to be able to contact and separate from the first to fourth valve ports, respectively;
First to fourth valve rods respectively connected to the first to fourth valve bodies;
The first valve rod and the second valve rod are lifted so as to be provided in the valve chamber and to separate the first valve body and the second valve body from the first valve port and the second valve port, respectively. A first valve lift plate for
The third valve rod and the fourth valve rod, which are provided in the valve chamber, lift the third valve body and the fourth valve body away from the third valve port and the fourth valve port, respectively. A second valve lift plate for
At least one actuator provided outside the valve chamber and configured to generate a driving force for lifting the first valve lifting plate and the second valve lifting plate;
At least one transmission member provided from outside the valve chamber to the inside of the valve chamber for transmitting the driving force of the actuator to the first valve lifting plate and the second valve lifting plate;
A steam valve device comprising: A partition wall that partitions the valve chamber into a first valve chamber portion and a second valve chamber portion;
The first valve port and the second valve port are disposed facing the first valve chamber,
The third valve port and the fourth valve port are arranged facing the second valve chamber,
2. The steam valve device according to claim 1, wherein the partition wall is formed with at least one opening that communicates the first valve chamber and the second valve chamber.   Of the openings formed in the partition wall, the total opening area S1 of the portion located below the center position of the partition wall in the height direction of the valve chamber is located above the center position. The steam valve device according to claim 2, wherein the opening is formed so as to be larger than a total opening area S <b> 2 of portions to be performed.   The steam valve device according to claim 2 or 3, wherein a connecting portion of the partition wall with the inner peripheral wall of the valve chamber is configured such that the thickness of the partition wall increases as the inner peripheral wall is approached.   The steam valve device according to any one of claims 2 to 4, further comprising at least one opening / closing member configured to be able to open and close the at least one opening. The first to fourth valve ports are arranged in series along the longitudinal direction of the valve chamber,
The valve housing includes a plurality of discharge passages for discharging the steam that has passed through the first to fourth valve ports to the outside of the valve housing;
At least one of the plurality of discharge paths communicates with the two valve ports so that the steam that has passed through any two of the first to fourth valve ports adjacent to each other is merged. The steam valve device according to any one of claims 1 to 5, further comprising a communication path configured to perform. The communication path includes one side of a communication path extending from one of the two valve ports to a merge position where steam that has passed through the two valve ports merges, A communication path on the other side of the two valve ports extending from the other valve port to the merging position,
The one valve port is adjacent to any one of the first to fourth valve ports in addition to the other valve port,
The one side portion of the first communication path is provided so as to move away from any one of the first to fourth valve ports in the longitudinal direction of the valve chamber as it goes downstream in the steam flow direction. The steam valve device described in 1.   The transmission member includes a first transmission member for transmitting the driving force of the actuator to the first valve lifting plate, and a second transmission member for transmitting the driving force of the actuator to the second valve lifting plate. The steam valve device according to any one of claims 1 to 7, comprising: The steam valve device according to any one of claims 2 to 8, wherein the valve housing is mounted on a turbine casing provided in the steam turbine and configured integrally with the turbine casing.

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