ON / OFF VALVE AND STEAM TURBINE
Patent Information
- Authority / Receiving Office
- DE · DE
- Patent Type
- Patents
- Current Assignee / Owner
- MITSUBISHI HEAVY IND LTD
- Filing Date
- 2018-02-15
- Publication Date
- 2026-07-02
AI Technical Summary
The existing on-off valves in steam turbines experience non-uniform thermal deformation due to stagnant steam flow, leading to improper opening and closing of the valve body, as the support shaft penetrates and changes the direction of steam flow, causing uneven heat transfer and temperature gradients.
The on-off valve design includes a valve housing with a thinner wall thickness on the downstream side of the communication hole, a non-uniform portion on the inner surface, a metal member on the outer surface, and a gap between the drive unit and valve housing to promote heat dissipation and uniform temperature distribution, reducing thermal deformation.
The design ensures smooth operation of the valve body by minimizing non-uniform thermal deformation, preventing bending and ensuring proper opening and closing, even under temperature changes.
Abstract
Description
Technical field
[0001] The present invention relates to an on / off valve provided in a steam flow path of a steam turbine.
[0002] Priority is claimed by Japanese patent application No. 2017-025964, filed on February 15, 2017, the contents of which are incorporated herein by reference. Technical background
[0003] In a steam turbine, rotor blades and guide vanes are arranged alternately within a casing. A multitude of rotor blades are positioned at intervals along the circumference of a rotating shaft, which rotates around an axis. The guide vanes are also attached to the casing. Additionally, steam from a steam boiler is supplied to the casing to rotate the shaft, thus generating electricity, for example, via a generator.
[0004] In a steam turbine, for example, an on / off valve is provided in a flow path through which the main steam is supplied from the steam boiler. Such an on / off valve is disclosed in PTL 1. In the on / off valve disclosed in PTL 1, a support shaft of a valve body is supported by a valve housing at an inlet section of the steam. List of patent literature
[0005] [PTL 1] Unexamined Japanese patent application, first publication no. 2015-68309 Summary of the invention: Technical problem
[0006] However, in the on / off valve disclosed in PTL 1, the flow path of the inlet section and the flow path of an outlet section of the steam are arranged such that they are perpendicular to each other, and the supporting shaft that carries the valve body is designed to penetrate the valve housing. That is, the direction of the flow path changes within the valve housing, and the supporting shaft is located at the point where the direction changes. Consequently, the steam flow stagnates at this point, and thus there is an interest in reducing the heat transfer between a wall surface of the valve housing and the steam at the point of stagnation. As a result, a section is created within the valve housing that is heated by the steam and has a high temperature, and a section to which heat is not sufficiently transferred by the steam and which has a low temperature.Additionally, at the relatively low temperature location, a temperature gradient increases across the wall surface of the valve housing, resulting in uneven thermal deformation of the valve housing. Consequently, the bearing shaft can be bent due to this uneven deformation, potentially leading to improper opening and closing of the valve body.
[0007] Therefore, the present invention provides an on / off valve and a steam turbine that can easily open and close the valve body by preventing the uneven heat deformation of the valve housing. Solution to the problem
[0008] The present invention employs the following means to solve the problems described above.
[0009] According to a first aspect of the present invention, an on / off valve is provided comprising: a valve housing comprising an inlet flow path for steam and an outlet flow path which is connected to the inlet flow path by a connecting hole on a downstream side in a flow direction of the steam, a valve body which is configured to open or close the connecting hole, and a valve support section which penetrates the valve housing such that a portion of the valve support section is arranged in the outlet flow path, is supported by the valve housing on the outlet flow path side of the connecting hole, and supports the valve body such that the valve body can be actuated in an opening direction of the connecting hole, wherein the outlet flow path extends in a direction which intersects the opening direction of the connecting hole to a downstream side.and a minimum wall thickness of the valve body on a side positioned downstream of the connection hole and opposite a side to which the exhaust flow path extends over the valve support section is smaller than a minimum wall thickness of the valve body on an upstream side of the connection hole.
[0010] According to this on / off valve, the minimum wall thickness of the valve casing on the outlet flow side, which becomes the downstream side of the connecting hole, and on the side opposite the side to which the outlet flow path extends across the valve support section, is less than the minimum wall thickness of the valve casing on the inlet flow path side, which is located on the upstream side of the connecting hole. Consequently, the thickness of the valve casing can be reduced at a location where the direction of a flow path changes in the outlet flow path, and at a location where the steam flow stagnates around the valve support section. Accordingly, for example, particularly when the steam turbine starts or the like, in a case where the temperature of the valve casing changes suddenly, a temperature gradient can be promoted on the wall surface of the valve casing at the location where the steam flow stagnates.
[0011] According to a second aspect of the present invention, in the on / off valve of the first aspect, a non-uniform section is provided on an inner surface around the valve support section of the valve housing that forms the outlet flow path.
[0012] The heat transfer area at a point where the steam flow stagnates is increased by the non-uniform section, and thus the steam flow can be disrupted. Therefore, heat transfer at the point where the non-uniform section is located can be promoted, and the temperature of the valve body at the point where the steam stagnates around the valve support section can be close to the temperature of other sections of the valve body. Consequently, the temperature gradient of the valve body wall surface at the point where the steam stagnates can be further reduced.
[0013] According to a third aspect of the present invention, in the on / off valve of the first or second aspect, the on / off valve further comprises a metal element which is attached to an outer surface of the valve housing on the downstream side of the connection hole.
[0014] Heat from the wall surface of the valve body can flow into the metal element on the side towards which the outlet flow path extends, through this metal element. That is, the metal element can function as a heat storage unit. Accordingly, compared to the side (the side towards which the outlet flow path extends) where the steam flow stagnates in the vicinity of the valve support section, heat dissipation can be promoted on the side towards which the outlet flow path extends, and thus thermal deformation of the valve body around the valve support section can be unified.
[0015] According to a fourth aspect of the present invention, in the on / off valve of one of the first to third aspects, the on / off valve further comprises a drive unit which is attached to the valve housing on the downstream side of the connecting hole and is configured to drive the valve support section, wherein a gap or space is provided between the drive unit and the valve housing on the side opposite the side to which the outlet flow path extends over the valve support section.
[0016] In this way, the gap or space between the actuator and the valve housing is located on the side opposite the side to which the exhaust flow path extends over the valve support section. This prevents heat dissipation from the valve housing to the actuator by conduction at this location. Additionally, the gap or space is not located between the valve housing and the actuator on the side to which the exhaust flow path extends, thus simplifying heat dissipation from the valve housing to the actuator. Consequently, thermal deformation of the valve housing around the valve support section can be unified on both sides of the valve support section.
[0017] Additionally, according to a fifth aspect of the present invention, an on / off valve is provided, comprising: a valve housing comprising an inlet flow path for steam and an outlet flow path that is connected to the inlet flow path by a connecting hole on a downstream side in a flow direction of the steam; a valve body configured to open or close the connecting hole; a valve support section that penetrates the valve housing such that a portion of the valve support section is arranged in the outlet flow path, is supported by the valve housing on the outlet flow path side from the connecting hole, and supports the valve body in such a way that the valve body can be actuated in an opening direction of the connecting hole; and a metal element that is attached to an outer surface of the valve housing on a downstream side from the connecting hole and on a sideto which the outlet flow path extends over the valve support section, is attached, wherein the outlet flow path extends in a direction that crosses the opening direction of the connecting hole to a downstream side.
[0018] Heat from the wall surface of the valve housing can flow into the metal element on the side towards which the outlet flow path extends, through the metal element, and thus the metal element can function as a heat storage unit. Accordingly, compared to the side where the steam flow stagnates in the vicinity of the valve support section, heat dissipation can be promoted on the side towards which the outlet flow path extends, and thus thermal deformation of the valve housing around the valve support section can be more uniform.
[0019] In addition, according to a sixth aspect of the present invention, an on / off valve is provided, comprising: a valve housing comprising an inlet flow path for steam and an outlet flow path that is connected to the inlet flow path by a connecting hole on a downstream side in a flow direction of the steam; a valve body configured to open or close the connecting hole; a valve support section that penetrates the valve housing such that a portion of the valve support section is arranged in the outlet flow path, is supported by the valve housing on the outlet flow path side of the connecting hole, and supports the valve housing in such a way that the valve body can be actuated in an opening direction of the connecting hole; and an actuating unit that is attached to the valve housing on a downstream side of the connecting hole and configured to actuate the valve support section.wherein the outlet flow path extends in a direction that intersects the opening direction of the connecting hole to a downstream side, and wherein a gap or space is provided between the actuator unit and the valve housing on one side opposite a side to which the outlet flow path extends over the valve support section.
[0020] In this way, the gap or space between the actuator and the valve housing is located on the side opposite the side to which the exhaust flow path extends over the valve support section. This prevents heat dissipation from the valve housing to the actuator at this location, which is caused by thermal conduction. Additionally, the gap or space is not located between the valve housing and the actuator on the side to which the exhaust flow path extends, thus simplifying heat dissipation from the valve housing to the actuator. Consequently, the thermal deformation of the valve housing around the valve support section can be uniform.
[0021] Additionally, according to a seventh aspect of the present invention, an on / off valve is provided, comprising: a valve housing comprising an inlet flow path for steam and an outlet flow path that is connected to the inlet flow path by a connecting hole on a downstream side in a flow direction of the steam; a valve body configured to open or close the connecting hole; a valve support section that penetrates the valve housing such that a portion of the valve support section is arranged in the outlet flow path, is supported by the valve housing on the outlet flow path side from the connecting hole, and supports the valve body in such a way that the valve body can be actuated in an opening direction of the connecting hole; a metal element that is attached to an outer surface of the valve housing on a downstream side from the connecting hole and on a sidea drive unit which is attached to the valve housing on the downstream side of the connecting hole and is configured to drive the valve housing, wherein the exhaust flow path extends in a direction that intersects the opening direction of the connecting hole to the downstream side, and wherein a gap or space is provided between the drive unit and the valve housing on one side opposite a side to which the exhaust flow path extends over the valve housing.
[0022] Accordingly, heat deformation of the valve housing around the valve support section can be unified by the metal element and the gap or space.
[0023] Additionally, according to an eighth aspect of the present invention, a steam turbine is provided, comprising: a steam flow path, and the on / off valve according to one of the first to seventh aspects, which are provided in the steam flow path.
[0024] The steam turbine is equipped with an inlet / outlet valve, and therefore the minimum wall thickness of the valve casing on the side opposite the side to which the outlet flow path extends over the valve support section is less than the minimum wall thickness of the valve casing on the inlet flow path side. Consequently, the thickness of the valve casing can be reduced at a point where the direction of the steam flow path changes and at a point where the steam flow stagnates around the valve support section. Accordingly, when the steam turbine starts up, or similar events occur, the temperature gradient on the wall surface of the valve casing can be reduced at the point where the steam flow stagnates. Advantageous effects of the invention
[0025] According to the present invention, a valve body can be opened and closed easily by preventing uneven heat deformation of a valve housing. List of characters Fig. Figure 1 is a schematic view showing an overall configuration of a steam turbine according to a first embodiment of the present invention. Fig. Figure 2 is a longitudinal sectional view of an on / off valve of the steam according to the first embodiment of the present invention. Fig. Figure 3 is a longitudinal section view of an on / off valve of the relevant technology and shows an analysis result that reveals a temperature distribution of a valve body. Fig. Figure 4A is a longitudinal sectional view of an on / off valve of a steam turbine according to a second embodiment of the present invention. Fig. 4B is a section view along a line A-A out of Fig. 4A from the on / off valve of the steam turbine according to the second embodiment of the present invention. Fig. Figure 5 is a longitudinal sectional view of an on / off valve of a steam turbine according to a modification example of the second embodiment of the present invention. Fig. Figure 6A is a longitudinal sectional view of an on / off valve of a steam turbine according to a third embodiment of the present invention. Fig. 6B is a section view along a line B-B out of Fig. 6A from the on / off valve of the steam turbine according to the third embodiment of the present invention. Fig. Figure 7A is a longitudinal sectional view of an on / off valve of a steam turbine according to a fourth embodiment of the present invention. Fig. 7B is a section view along a line C-C out of Fig. 7A from the on / off valve of the steam turbine according to the fourth embodiment of the present invention. Description of the embodiments [First embodiment]
[0026] The following are examples of steam turbine designs. 10 The present invention is described with reference to the accompanying figures. However, the present invention is not limited to these embodiments.
[0027] As in Fig. Figure 1 shows the steam turbine. 10 The present invention is a power engine with external combustion, which extracts energy from steam. S extracted as rotational power and used for a generator or the like in a power plant.
[0028] The steam turbine 10 includes a housing 11 , a rotational wave 20 , which pertain to the housing 11 rotates, a guide vane ring 12 , which is attached to the casing 11in the case 11 is attached, a running paddle ring 30 , which is attached to the rotating shaft 20 is attached, a steam boiler or water heater 40 , the steam S (Main steam) is generated, which enters the casing 11 to introduce a steam flow path 41 , which the steam boiler 40 and the case 11 connects, and an on / off valve 42 , which the steam flow path 41 opens and closes.
[0029] The guide vane ring 12 is through the case 11 held and a large number of guide vane rings 12 are in intervals along one direction of a central axis O the rotational wave 20 provided for. Each guide vane ring 12 is designed to separate from an inner circumferential surface of the housing 11 to extend radially inwards. In each guide vane ring 12are a variety of guide vanes 12w arranged in intervals in a circumferential direction.
[0030] The rotational wave 20 extends along the central axis O , to the case 11 to penetrate. An intermediate section of the rotational wave. 20 in the direction along the central axis O is in the case 11 recorded and both end sections of the rotational wave 20 in the direction of the central axis O are facing an outside of the housing 11 from both end sections of the housing 11 in the direction of the central axis O before. The rotational wave 20 is rotatable with respect to the housing 11 around the central axis O through storage sections 13 carried on both end sections, which are from the case 11 protrude outwards. Each storage section 13 includes plain bearings 14, which are located at both end sections of the rotational wave 20 are provided, and an axial bearing 15 , which is located at one end of the rotating shaft 20 is planned.
[0031] The vane ring 30 is caused by the rotational wave 20 held and a large number of the rotor blade rings 30 are in intervals along the direction of the mid-axis O the rotational wave 20 provided. The impeller rings 30 and the guide vane rings 12 are alternating along the central axis O arranged. Each impeller ring 30 is designed to separate itself from an outer circumferential surface of the rotating shaft 20 to extend radially outwards in each impeller ring. 30 are a variety of running blades 30w arranged in intervals in the circumferential direction.
[0032] The steam boiler 40generates high-temperature and high-pressure steam S and carries the steam S to the steam turbine 10 via the steam flow path 41 to.
[0033] Additionally, this steam turbine 10 A so-called high-pressure turbine. Additionally, although not shown, an intermediate-pressure turbine and a low-pressure turbine are connected to this high-pressure turbine. A condenser is connected to the high-pressure turbine, and water is pumped from the condenser to the steam boiler. 40 supplied and the steam S through the steam boiler 40 regenerated.
[0034] Next, the on / off valve will be... 42 related to Fig. 2 will be described.
[0035] The on / off valve 42 includes a valve housing 44 , a holding valve body (valve body) 46 , which is in the valve housing 44is actuated, a stop valve carrying section (valve carrying section) 47 , which is the stop valve body 46 It features an adjustable valve body 48 , which is arranged to protect the holding valve body 46 to be facing it, and an adjustable valve support section 49 , which adjusts the valve body 48 It carries. Additionally, the on / off valve includes 42 furthermore, a first actuator 70 , which includes the stop valve carrying section 47 drives and a second actuator 75 , which includes the adjustable valve support section 49 drives.
[0036] In the valve housing 44 is an inlet flow path 51 , which is connected to the steam flow path 41 and an outlet flow path 52 is connected to the inlet flow path 51 is connected, as provided. Additionally, steam flows. S from the inlet flow path51 in and flows from the outlet flow path 52 out of.
[0037] The inlet flow path 51 is connected to the steam flow path 41 connected. Additionally, there is something in the valve housing. 44 a lid section 45 provided, which is attached and released in such a way that the inlet flow path 51 can be opened and closed.
[0038] The outlet flow path 52 extends straight along an opening direction D of the connecting hole 53 from the connecting hole 53 , which is a connecting section between the inlet flow path 51 and the outlet flow path 52 on a downstream side of the inlet flow path 51 in a flow of steam S is, and after that is the outlet flow path 52so curved that its direction of extension is bent by 90 degrees and points directly towards a downstream side in the flow of steam S extends. That is, the outlet flow path 52 extends in a direction (an orthogonal direction in the present embodiment) that is the opening direction D of the connecting hole 53 crosses. An annular valve seat 58 is at the connecting hole 53 planned.
[0039] The stop valve body 46 is in the opening direction D of the connecting hole 53 actuated to open the connecting hole 53 to open and close. That is, the holding valve body. 46 is confirmed to access the valve seat 58 to approach it so that it aligns with the valve seat 58 comes into contact, or is actuated in such a way that it moves away from the valve seat. 58 so that it separates in such a way that it does not come into contact with the valve seat58 comes into contact. This allows the steam to S between the inlet flow path 51 and the outlet flow path 52 to flow or blocks the flow of steam S away.
[0040] The stop valve carrying section 47 includes a valve stem 60 , which is the stop valve body 46 straight along the opening direction D of the connecting hole 53 extends, and a sheathing tube 61 , into which the valve stem 60 is used, and which the valve stem 60 so that the valve stem 60 movable in the opening direction D moved. The casing tube 61 extends directly in the opening direction D , penetrates the valve housing 44 and is through the valve housing 44 worn. The sheathing tube 61 extends to a position adjacent to the stop valve body46 approaches and a section of the casing tube 61 is in the outlet flow path 52 arranged.
[0041] In the present embodiment, the valve housing has a minimum wall thickness t2. 44 , which is located at the outlet flow path- 52 -side (downstream side) of the connection hole 53 is positioned on a side opposite a side to which the outlet flow path 52 over the sheathing tube 61 extends, is positioned, smaller than a minimum wall thickness t1 of the valve housing 44 at the inlet flow path- 51 -side (power side) of the connection hole 53 .
[0042] The adjustable valve body 48 is in the inlet flow path 51 arranged and is the stop valve body 46 in the opening direction D facing the adjustable valve body. 48operated to move towards the valve seat 58 to approach it so that it comes into contact with the valve seat 58 comes, and is operated to be separated so that it does not come into contact with the valve seat. 58 comes. When the adjustable valve body 48 with the valve seat 58 When it comes into contact, the adjustable valve body 48 with an outer end of the stop valve body 46 in contact. That is, an end section of the adjustable valve body. 48 at the connecting hole- 53 The side is shaped like a cylinder.
[0043] The adjustable valve support section 49 has a cylindrical bushing 66 , which are located on an inner surface of the valve housing 44 is attached to the connecting hole 53 in the opening direction D is facing towards, and carries the adjustable valve body 48 and a valve stem 65, which is inside the socket 66 is arranged to run straight along the opening direction D extends and the adjustable valve body 48 carries. The valve stem 65 extends directly in the opening direction D and penetrates the valve housing 44 .
[0044] The first actuator 70 includes a housing 71 , which is attached to the valve housing 44 at the outlet flow path- 52 -side in the valve housing 44 is attached, and a pushrod 72 , which the valve stem 60 carries and the valve stem 60 moved forwards or backwards. The casing 71 is on an extension line from an axis of the valve stem 60 arranged, which the stop valve body 46 carries, and is connected to an outer surface of the valve housing. 44 attached.
[0045] The second actuator 75includes a housing 76 , the one with the valve housing 44 at the inlet flow path- 51 -side in the valve housing 44 is attached, and a pushrod 77 , which the valve stem 65 carries and the valve stem 65 moved forwards or backwards. The casing 76 is on an extension line from an axis of the valve stem 65 arranged, which includes the adjustable valve body 48 carries, and is connected to the outer circumferential surface of the valve housing. 44 attached.
[0046] The steam turbine 10 The embodiment described above includes the on / off valve. 42 , which has the configuration described above.
[0047] Here, as in an analysis result from Fig. 3 the flow of steam S around the sheathing tube 61 of the stop valve carrying section 46in the outlet flow path 52 around, and thus there is a heat transfer coefficient between the steam S and the valve housing 44X lower than those of other sections of the valve body 44X For example, in a Fig. 3 valve housings shown 44X the minimum wall thickness t1 = t2.
[0048] In particular, the flow of steam stagnates. S on a section opposite a side (right side on a paper surface of Fig. 3), to which the outlet flow path leads 52 via the sheathing tube 61 extends, that is, a corner section 52a , where the outlet flow path 52 is bent. Consequently, the heat transfer coefficient between the steam decreases. S and the valve housing 44X at the corner section 52a Consequently, the temperature of the valve housing 44Xat the corner section 52a lower than that of other sections of the valve housing 44X .
[0049] Accordingly, as in Fig. 3 shown compared to the side to which the outlet flow path leads. 52 over the sheathing tube 61 extends, an extent of thermal deformation (extent of thermal expansion) of an outer surface of the casing tube 61 on the side opposite the extension side of the outlet flow path 52 is smaller, and thus the sheathing tube 61 and the valve stem 60 bent as a whole. Consequently, it is difficult to remove the stop valve body. 46 easy to operate.
[0050] In the present embodiment, the minimum wall thickness t2 of the valve housing is 44 on the side opposite the side to which the outlet flow path leads 52 over the sheathing tube 61at the outlet flow path- 52 -side extends, smaller than the minimum wall thickness t1 of the valve housing 44 at the inlet flow path- 51 -side. Consequently, at the corner section 52a , which is the position at which one direction of the outlet flow path 52 is changed, and at the position where the flow of steam S around the sheathing tube 61 around stagnant, the thickness of the valve housing 44 will be reduced.
[0051] Accordingly, for example, particularly in a case where the temperature of the valve housing 44 suddenly during the start-up of the steam turbine 10 is changed or the like, heat conduction at the wall surface of the valve housing. 44 to be conveyed at the position where the flow of steam SThe temperature stagnates, thus reducing the temperature gradient across the wall surface. Consequently, a temperature within the valve housing can be maintained. 44 through the steam S at the outlet flow path- 52 -side is uniformly increased and the heat deformation of the valve housing is reduced. 44 around the sheathing tube 61 The surrounding area can be standardized. Accordingly, uneven heat deformation of the valve housing is prevented. 44 prevented bending deformation of the valve stem 60 and the sheathing tube 61 , as in Fig. As shown in point 3, this can be prevented. Consequently, the holding valve body can be... 46 easily open or close, while no thermal stress arises on the valve stem. 60 or the like is prevented. [Second embodiment]
[0052] Next, a second embodiment of the steam turbine will be described. 10as described according to the present invention. Additionally, in the second embodiment described below, the same reference numerals are assigned to the same configurations in the figures as in the first embodiment, and repeated descriptions are omitted. The second embodiment differs from the first embodiment in that a non-unitary section 80 on an inner surface of the valve housing 44A is planned.
[0053] As in Fig. 4A shows the non-uniform section. 80 on an inner surface of the valve housing 44A provided that the outlet flow path 52 forms on the side opposite the side where the outlet flow path 52 is planned. In particular, the inconsistent section 80 a multitude of concave sections 81 , which extend along the casing tube 61and the valve stem 60 extend adjacent to each other in the circumferential direction of the valve stem 60 are arranged, and from the inner surface of the valve housing 44A are recessed, and fin-like convex sections 82 , which lead to the outlet flow path 52 between the concave sections 81 protrude, which are adjacent to each other in the circumferential direction. Accordingly, the non-uniform section 80 intended to protect the sheathing tube 61 to be surrounded by the outer perimeter. As in Fig. 4B shows, for example, a cross-sectional shape of each concave section. 81 , if the concave section 81 in the opening direction D It is considered to be semicircular, and if it is in the opening direction D When considering the multitude of concave sections, 81 form a wave shape.
[0054] Additionally, as in Fig. 5 shows the inconsistent section 80 cylindrical fins 83 exhibiting features that are located on the inner surface of the valve housing 44A protrude. Instead of the cylindrical fins 83 Pen-shaped fins can be used. Additionally, the uneven section can be used. 80 It could simply be a rough surface, which is a rough inner surface of the valve housing. 44A exhibits.
[0055] In a case where the valve housing 44A The non-uniform section is formed by casting. 80 on the inner surface of the valve housing 44A are formed by shapes of a form that correspond to the non-uniform section 80 in a casting mold. Additionally, after the valve housing 44A is manufactured, the inconsistent section 80 formed by machining.
[0056] According to the steam turbine10 In the embodiment described above, a heat transfer area is formed by the non-uniform section. 80 , which is in the valve housing 44A is intended to be enlarged at the position where the flow of steam S stagnates, and thus the flow of steam cannot S This can disrupt heat transfer at the location of the non-uniform section. 80 is intended to be promoted and the temperature of the valve housing 44A can be located at the position where the steam S around the sheathing tube 61 stagnates around, close to the temperatures of other sections of the valve housing. 44A be. Consequently, the temperature gradient of the wall surface of the valve housing can be 44A at the position where the steam S stagnates.
[0057] Accordingly, the temperature gradient of the wall surface of the valve housing can be 44A on the side opposite the side to which the outlet flow path leads 52 extends. Therefore, the holding valve body 46 by preventing uneven heat deformation of the valve housing 44A Open and close easily. [Third embodiment]
[0058] Next, a third embodiment of the steam turbine will be described. 10as described according to the present invention. In addition, in the third embodiment described below, the same reference numerals are assigned to the same configurations in the drawings as in the first and second embodiments, and repeated descriptions are omitted. The third embodiment differs from the first and second embodiments in that it further includes a metal element. 90 It is intended that the outer surface of the valve housing will be 44 is attached.
[0059] As in Fig. 6A shows the metal element. 90 at the outlet flow path- 52 -side of the connecting hole 53 positioned and is located on the outer surface of the valve housing 44 only attached on one side, towards which the outlet flow path 52 over the sheathing tube 61 extends. Furthermore, the metal element90 made from a metallic material that has a high heat capacity, such as carbon steel or stainless steel, and for example as in Fig. 6B shown coaxial with the valve stem 60 arranged and has from the opening direction D considers a semi-circular shape.
[0060] In the present embodiment, the metal element 90 inside the housing 71 of the first actuator 70 provided for, with the first actuator 70 on the valve housing 44 is attached, and thus the metal element 90 indirectly with the valve housing 44 attached.
[0061] Additionally, the metal element 90 not inside the case 71 of the first actuator 70 provided and can be directly connected to the outer circumferential surface of the valve housing 44 be attached. Furthermore, the metal element can 90It does not need to be shaped in a semi-circular form and can have any shape, as long as it is provided on the side towards which the outlet flow path leads. 52 over the sheathing tube 61 extends. For example, the metal element 90 divided, and thus a variety of metal elements can be used 90 be provided for.
[0062] The metal elements can be used here 90 be provided on both sides of the side opposite the side to which the outlet flow path leads. 52 over the sheathing tube 61 extends, and to the side to which the outlet flow path 52 extends. An installation position of the metal element. 90 This can be changed accordingly depending on conditions, such as whether deformation is to be prevented during startup or during nominal operation.
[0063] According to the steam turbine 10The present embodiment described above can be modified by the metal element 90 Heat from the wall surface of the valve housing 44 into the metal element 90 flow in on the side towards which the outlet flow path 52 extends. That is, the metal element 90 It can function as a heat storage unit. Accordingly, compared to the side where the steam flows... S in the vicinity of the casing tube 61 stagnates, which becomes the side opposite the side to which the outlet flow path leads 52 extends, heat dissipation is promoted on the side to which the outlet flow path leads. 52 extends, and thus the heat deformation of the valve housing can 44 around the sheathing tube 61 around will be standardized.
[0064] Accordingly, the temperature gradient of the wall surface of the valve housing can be 44on the side opposite the side to which the outlet flow path leads 52 extends. Therefore, the valve body can be protected by preventing uneven heat deformation of the valve housing. 44 They can be opened and closed without any problems. [Fourth embodiment]
[0065] Next, a fourth embodiment of the steam turbine will be described. 10 as described according to the present invention. Additionally, in the fourth embodiment described below, the same reference numerals are assigned to the same configurations in the figures as in the first through third embodiments, and repeated descriptions are omitted. The fourth embodiment differs from the first through third embodiments in that a gap or space is included. 91 between the first actuator 70 and the valve housing 44is provided on the side opposite the side to which the outlet flow path leads 52 over the sheathing tube 61 extends.
[0066] That is, as in the Fig. 7A and Fig. As shown in 7B, there is a gap 91 , which is coaxial with the valve stem 60 is arranged, and has a semicircular shape, between the housing 71 of the first actuator 70 and the valve housing 44 formed on the side opposite the side to which the outlet flow path leads 52 over the sheathing tube 61 extends.
[0067] Additionally, the gap can 91 It need not be in a semicircular shape and can have any shape, as long as it is provided at least on the side towards which the outlet flow path 52 over the sheathing tube 61 extends. For example, the gap 91in the circumferential direction of the valve stem 60 be divided and have a multitude of columns 91 may be provided for.
[0068] Here, the column can be used. 91 be provided on both sides of the side opposite the one towards which the outlet flow path leads. 52 over the sheathing tube 61 extends, and to the side to which the outlet flow path 52 extends in such a way that a size of the gap 91 on the side opposite the side to which the outlet flow path leads 52 extends, is larger than the size of the gap 91 on the side towards which the outlet flow path 52 extends.
[0069] According to the steam turbine 10 In the embodiment described above, the gap 91 between the housing 71 of the first actuator 70 and the valve housing 44provided on the side opposite the side to which the outlet flow path leads 52 over the sheathing tube 61 extends, and thus heat dissipation caused by heat conduction can occur at this position from the valve housing. 44 to the actuator 70 be prevented.
[0070] Additionally, the gap 91 not between the valve housing 44 and the case 71 provided on the side towards which the outlet flow path 52 extends, that is, the valve housing 44 and the case 71 They come into close contact with each other, and thus heat dissipation from the valve housing is possible. 44 to the case 71 It can be carried out simply. Accordingly, heat deformation of the valve housing is not possible. 44 around the sheathing tube 61 around both sides of the sheathing tube 61 to be standardized.
[0071] Accordingly, the temperature gradient of the wall surface of the valve housing can be 44 on the side opposite the side to which the outlet flow path leads 52 extends. Therefore, the valve body can be protected by preventing uneven heat deformation of the valve housing. 44 They can be opened and closed without any problems.
[0072] The embodiments of the present invention are described in detail above with reference to the figures. However, the respective configurations and combinations thereof, and the like, in the respective embodiments are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible within a scope that does not deviate from the essence of the present invention. Furthermore, the present invention is not limited by the embodiments and is limited only by the claims.
[0073] For example, in the embodiments described above, the on / off valve 42 described that the holding valve body 46 and the adjustable valve body 48 includes. However, the on / off valve can 42 to be provided which does not have an adjustable valve body 48 exhibits.
[0074] Additionally, the outlet flow path 52 not limited to the configurations described above, as long as it extends in the direction that defines the opening direction D of the connecting hole 53 crosses, and the valve stem 60 is planned at the position (corner section) 52a) , where the direction of extension changes. That is, the outlet flow path 52 can just from the connecting hole 53 extend, and then the outlet flow path can 52It can be bent easily, so that the direction of extension changes in between. The outlet flow path 52 can be bent abruptly to move towards a side of the steam flow that is downstream S to extend.
[0075] Additionally, the metal element can 90 the third embodiment and the gap 91 the fourth embodiment can be provided together. Additionally, the metal element can be 90 the third embodiment and the gap 91 the fourth embodiment can be applied to the on / off valve which has the configurations of the first embodiment and the second embodiment, or can be applied to the on / off valve which does not have the configurations of the third embodiment and the second embodiment. Industrial applicability
[0076] According to the present invention, a valve body can be opened and closed easily by preventing uneven heat deformation of a valve housing. Reference symbol list 10: Steam turbine 11: Housing 12: Guide vane ring 12w: Guide vane 13: Storage section 14: Plain bearings 15: Radial bearing 20: Rotational wave 30: Runner blade ring 30w: Running blade 40: Steam boiler or boiler 41: Steam flow path 42: On / Off valve 44, 44A, 44X: Valve housing 45: Cover section 46: Stop valve body (valve body) 47: Stop valve carrying section (valve carrying section) 48: adjustable valve body 49: adjustable valve support section 51: Inlet flow path 52: Outlet flow path 52a: Corner section 53: Connecting hole 58: Valve seat 60: Valve stem 61: Sheathing tube 65: Valve stem 66: Socket 70: first actuator (drive unit) 71: Housing 72: Pushrod 75: second actuator 76: Case 77: Pushrod 80: inconsistent section 81: concave section 82: convex section 83: cylindrical fin 90: Metal element 91: Gap or space O: Central axis S: Steam D: Opening direction QUOTES INCLUDED IN THE DESCRIPTION
[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature
[0000] JP 2017025964
[0002] JP 201568309
[0005]
Claims
[1] An on / off valve with: a valve housing comprising an inlet flow path for steam and an outlet flow path which is connected to the inlet flow path by a connecting hole on a downstream side in a flow direction of the steam, a valve body designed to open or close the connecting hole, and a valve support section which penetrates the valve housing in such a way that a section of the valve support section is arranged in the outlet flow path, is supported by the valve housing on the outlet flow path side of the connecting hole, and supports the valve body in such a way that the valve body can be actuated in an opening direction of the connecting hole, wherein the outlet flow path extends in a direction that intersects the opening direction of the connecting hole to a downstream side, and wherein a minimum wall thickness of the valve body on a side positioned downstream of the connecting hole and opposite a side to which the exhaust flow path extends over the valve support section is smaller than a minimum wall thickness of the valve body on a upstream side of the connecting hole. [2] An on / off valve according to claim 1, wherein in an inner surface of the valve housing forming the outlet flow path a non-uniform section is provided on an inner surface around the valve support section. [3] The on / off valve according to claim 1 or 2, further comprising: a metal element that is attached to an outer surface of the valve housing on the downstream side from the connection hole. [4] The on / off valve according to any one of claims 1 to 3, further comprising: a drive unit which is attached to the valve housing on the downstream side from the connecting hole and is designed to drive the valve support section, wherein a gap or space is provided between the drive unit and the valve housing on the side opposite the side to which the exhaust flow path extends over the valve support section. [5] An on / off valve with: a valve housing comprising an inlet flow path for steam and an outlet flow path which is connected to the inlet flow path by a connecting hole on a downstream side in a flow direction of the steam, a valve body designed to open or close the connecting hole, a valve support section which penetrates the valve housing in such a way that a section of the valve support section is arranged in the outlet flow path, is supported by the valve housing on the outlet flow path side of the connecting hole, and supports the valve body in such a way that the valve body can be actuated in an opening direction of the connecting hole, and a metal element that is attached to an outer surface of the valve housing on a downstream side from the connection hole and on a side to which the exhaust flow path extends over the valve support section, wherein the outlet flow path extends in a direction that intersects the opening direction of the connecting hole to a downstream side. [6] An on / off valve with: a valve housing comprising an inlet flow path for steam and an outlet flow path which is connected to the inlet flow path by a connecting hole on a downstream side in a flow direction of the steam, a valve body designed to open or close the connecting hole, a valve support section which penetrates the valve housing in such a way that a section of the valve support section is arranged in the outlet flow path, is supported by the valve housing on the outlet flow path side of the connecting hole, and supports the valve housing in such a way that the valve body can be actuated in an opening direction of the connecting hole, and a drive unit which is attached to the valve housing on a downstream side from the connecting hole and is designed to drive the valve support section, wherein the outlet flow path extends in a direction that intersects the opening direction of the connecting hole to a downstream side, and wherein a gap or space is provided between the drive unit and the valve housing on one side opposite a side to which the exhaust flow path extends over the valve support section. [7] An on / off valve with: a valve housing comprising an inlet flow path for steam and an outlet flow path which is connected to the inlet flow path by a connecting hole on a downstream side in a flow direction of the steam, a valve body designed to open or close the connecting hole, a valve support section which penetrates the valve housing in such a way that a section of the valve support section is arranged in the outlet flow path, is supported by the valve housing on the outlet flow path side of the connecting hole, and supports the valve body in such a way that the valve body can be actuated in an opening direction of the connecting hole, a metal element that is attached to an outer surface of the valve housing on a downstream side from the connection hole and on a side to which the exhaust flow path extends over the valve support section, and a drive unit which is attached to the valve housing on the downstream side from the connecting hole and is designed to drive the valve support section, wherein the outlet flow path extends in a direction that intersects the opening direction of the connecting hole to the downstream side, and wherein a gap or space is provided between the drive unit and the valve housing on one side opposite a side to which the exhaust flow path extends over the valve support section. [8] A steam turbine with: a steam flow path, and the on / off valve according to one of claims 1 to 7, which is provided in the steam flow path.