Automatic main throttle valve travel switch capable of eliminating heat radiation influence and steam turbine

Abstract

The utility model discloses an automatic main throttle valve travel switch capable of eliminating the heat radiation influence and a steam turbine, and relates to the technical field of steam turbines, and the automatic main throttle valve travel switch capable of eliminating the heat radiation influence comprises a U-shaped mounting bottom plate, a touch plate and a switch body; the U-shaped opening of the mounting bottom plate is arranged in the direction opposite to the main valve cover; switch bodies are respectively mounted on two sides of the U-shaped opening of the mounting bottom plate; the touch plate is connected with the main valve rod through the connecting deflector rod and is arranged along the direction of the U-shaped opening; a trigger piece used for triggering the switch body is arranged at the end, away from the main valve rod, of the touch plate. Through the improved design, the distance between the travel switch and the main valve cover is increased, the heat radiation influence of the main valve cover on the switch body is effectively eliminated, and safe and stable operation of equipment is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of steam turbines, and in particular to an automatic main steam valve travel switch and a steam turbine capable of eliminating the influence of heat radiation. Background Art

[0002] The automatic main steam valve of the steam turbine, also known as the emergency shut-off valve, is the most important executive component of the safety system. It is used to ensure that the main steam entering the steam turbine can be quickly cut off in critical situations to achieve emergency shutdown.

[0003] The automatic main steam valve is mounted horizontally on the side of the turbine's regulating valve housing, above the front cylinder, and is controlled by a hydraulic motor. The valve is opened by the oil pressure from the safety (or shutoff) valve located below the hydraulic motor's piston. If the safety (or shutoff) oil pressure below the hydraulic motor's piston drops, the disc spring within the hydraulic motor rapidly closes the valve.

[0004] The full-open / full-close signals for the automatic main steam valve are controlled by a travel switch mounted on the main steam valve body. When the valve stem moves, the lever affixed to it moves synchronously. The lever contacts the travel switch operating head on the valve body, actuating the internal mechanism of the travel switch. This activates the contact system, generating the full-open / full-close signal for the automatic main steam valve. When the lever separates from the travel switch operating head, the full-open / full-close signal disappears.

[0005] Because the medium flowing through the automatic main steam valve is high-temperature, high-pressure superheated steam (P: 6.0 MPa, T: 480°C), the valve body temperature is also very high. Furthermore, the U-shaped mounting base opening of the existing automatic main steam valve limit switch faces the main steam valve cover, and the mounting base is only 100 mm away from the valve cover nut. The high temperature radiation from the main steam valve cover directly causes the limit switch housing mounted on the U-shaped base to heat up to 90-95°C. Prolonged operation in such high temperatures can cause the contact system within the limit switch to malfunction. Once the limit switch contact system fails, the unit's ETS protection will directly trigger a trip.

[0006] Therefore, it is urgent to provide a new solution to solve the above problems. Utility Model Content

[0007] In view of this, the purpose of this application is to provide an automatic main steam valve travel switch and steam turbine that eliminates the influence of thermal radiation, so as to solve the technical problem that the existing travel switch installed on the automatic main steam valve is easily affected by thermal radiation, resulting in distortion of the automatic main steam valve opening and closing position signals.

[0008] To achieve the above technical objectives, the present application provides an automatic main steam valve travel switch that eliminates the influence of heat radiation, comprising a U-shaped mounting base, a touch plate, and a switch body;

[0009] The U-shaped opening of the mounting base is arranged in the opposite direction of the main steam valve cover;

[0010] The mounting base is provided with a switch body on both sides of the U-shaped opening;

[0011] The touch plate is connected to the main steam valve stem via a connecting rod and is arranged along the direction of the U-shaped opening;

[0012] An end of the touch plate away from the main steam valve stem is provided with a triggering member for triggering the switch body.

[0013] Furthermore, the switch body is mounted on the mounting base in an adjustable position along the direction of the U-shaped opening.

[0014] Furthermore, the mounting base plate is provided with first adjustment slots on both sides of the U-shaped opening and distributed along the direction of the U-shaped opening;

[0015] The switch body is provided with a first mounting hole corresponding to the first adjustment slot;

[0016] Also included is a first locking assembly;

[0017] The first locking assembly passes through the first adjustment slot and the first mounting hole, and is used to fasten the switch body and the mounting base together.

[0018] Furthermore, the mounting base is provided with at least two parallel and spaced first adjustment slots on both sides of the U-shaped opening;

[0019] The switch body is provided with at least two first mounting holes which are in one-to-one correspondence with the first adjusting slots.

[0020] Furthermore, the trigger member is an L-shaped plate, comprising a trigger plate body and a mounting plate body;

[0021] The trigger plate is vertically connected to the mounting plate;

[0022] The trigger plate is used to trigger the switch body;

[0023] The mounting plate body is fixedly connected to the touch plate.

[0024] Furthermore, the triggering member is mounted on the touch plate in an adjustable position along the direction of the U-shaped opening.

[0025] Furthermore, the touch plate is provided with a second adjustment slot distributed along the direction of the U-shaped opening;

[0026] The mounting plate is provided with a second mounting hole corresponding to the second adjusting slot;

[0027] Also included is a second locking assembly;

[0028] The second locking assembly passes through the second adjustment slot and the second mounting hole, and is used to fasten the mounting plate body and the touch plate together.

[0029] Furthermore, the first locking assembly and the second locking assembly both include a locking bolt and a locking nut connected to the locking bolt.

[0030] Furthermore, the length of the touch plate is greater than 400 mm.

[0031] The present application also discloses a steam turbine, comprising a steam turbine body and the automatic main steam valve travel switch for eliminating the influence of heat radiation.

[0032] As can be seen from the above technical solutions, the automatic main steam valve travel switch designed in this application to eliminate the effects of thermal radiation changes the installation orientation of the mounting base plate, rotating its U-shaped opening 180°, toward the opposite direction of the main steam valve cover. This increases the distance between the mounting base plate and the main steam valve cover. A longer touch plate is then designed, with one end extending to the position where the switch body is installed, to cooperate with the switch body. This improved design increases the distance between the travel switch and the main steam valve cover, effectively eliminating the effects of thermal radiation generated by the main steam valve cover on the switch body, ensuring safe and stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 A top view of an automatic main steam valve travel switch for eliminating the influence of heat radiation provided in this application;

[0035] Figure 2 A side view of the partial structure of an automatic main steam valve travel switch for eliminating the influence of heat radiation provided in this application;

[0036] In the figure: 1. Mounting base plate; 11. U-shaped opening; 12. First adjustment slot; 2. Switch body; 21. Flange plate; 22. First mounting hole; 3. Touch plate; 31. Second adjustment slot; 4. Trigger; 41. Mounting plate; 411. Second mounting hole; 42. Trigger plate; 5. Connecting lever; 6. Main steam valve stem; 7. Main steam valve cover; 71. Cover nut. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions of the embodiments of the present application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present application, not all of them. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the embodiments of the present application.

[0038] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0039] In the description of the embodiments of the present application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, replaceable connections, or integral connections. They can also refer to mechanical connections or electrical connections. They can also refer to direct connections or indirect connections through an intermediate medium. They can also refer to internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0040] The embodiment of the present application discloses an automatic main steam valve travel switch that eliminates the influence of heat radiation.

[0041] See also Figure 1 An embodiment of an automatic main steam valve travel switch for eliminating the influence of heat radiation provided in the embodiments of the present application includes:

[0042] A U-shaped mounting base plate 1, a touch plate 3 and a switch body 2.

[0043] The U-shaped opening 11 of the mounting base plate 1 is arranged in the opposite direction of the main steam valve cover 7 .

[0044] The mounting base 1 is provided with a switch body 2 on both sides of the U-shaped opening 11. It can be understood that the switch bodies 2 are distributed on both sides of the U-shaped opening 11 in a direction perpendicular to the U-shaped opening 11, with at least one switch body 2 distributed on each side. The switch body 2 is an existing travel switch module, which mainly includes an operating head, a contact system and a shell. The operating head is a key part of the travel switch. It is usually installed on the moving parts of the production machinery to trigger the action of the switch. When the moving parts hit the operating head, it will drive the internal mechanism to move; the contact system is the core of the travel switch, which is responsible for connecting or disconnecting the circuit. When the operating head is hit, the contact system will change its state accordingly, thereby controlling the switch of the circuit. The shell is used to protect the operating head and the contact system, prevent external factors from affecting the internal mechanism, and provide a basis for installation and fixation. The switch body 2 of the present application can directly use the existing travel switch module, so the specific structure will not be described in detail.

[0045] The touch plate 3 is connected to the main steam valve stem 6 via a connecting rod 5 and is positioned along the U-shaped opening 11. It should be noted that the connecting rod 5 is a connecting rod structure that is vertically fixed to the main steam valve stem 6 and moves with the main steam valve stem 6. The specific connection between the connecting rod 5 and the touch plate 3 can be a threaded connection. For example, the end of the connecting rod 5 away from the main steam valve stem 6 passes through the touch plate 3, and the portion of the rod that passes through the touch plate 3 is designed as a threaded rod section. In this way, two nuts can be inserted into the threaded rod section to clamp the touch plate 3, thereby achieving a fixed connection between the connecting rod 5 and the touch plate 3. Alternatively, an annular flange can be provided on the threaded rod section to contact and abut the bottom surface of the touch plate 3. A nut (a butterfly nut) can then be inserted into the threaded rod section to clamp the touch plate 3 together, thereby achieving a fixed connection between the touch plate 3 and the connecting rod 5. The above-mentioned method is a detachable connection method, which is convenient for subsequent maintenance. Welding fixation can also be used as needed to directly fix the connection. Those skilled in the art can make changes to the design according to actual needs without limitation.

[0046] The end of the touch plate 3 away from the main steam valve stem 6 is provided with a triggering member 4 for triggering the switch body 2. By contacting the operating head of the switch body 2, the contact system of the switch body 2 is activated, thereby completing the triggering.

[0047] The automatic main steam valve travel switch designed in the present application to eliminate the influence of heat radiation changes the installation direction of the mounting base plate 1 so that its U-shaped opening 11 is rotated 180°, facing the opposite direction of the main steam valve cover 7, so that the distance between the mounting base plate 1 and the main steam valve cover 7 can be increased. A longer touch plate 3 is then designed so that one end of it extends to the position where the switch body 2 is installed to cooperate with the switch body 2. Through the above-mentioned improved design, the distance between the travel switch and the main steam valve cover 7 is increased (compared to the original design, the distance between the mounting base plate 1 and the valve cover nut 71 of the main steam valve cover 7 is increased to 400mm), thereby effectively eliminating the heat radiation influence generated by the main steam valve cover 7 on the switch body 2, ensuring the safe and stable operation of the equipment.

[0048] The above is an embodiment of the present invention, which provides an automatic main steam valve travel switch that eliminates the influence of heat radiation. The following is an embodiment of the present invention, which provides an automatic main steam valve travel switch that eliminates the influence of heat radiation. For details, please refer to Figures 1 to 2 .

[0049] Based on the solution of the above embodiment 1:

[0050] Furthermore, the switch body 2 is installed on the mounting base plate 1 in an adjustable position along the direction of the U-shaped opening 11. It can be understood that the distance between the switch body 2 and the main steam valve cover 7 is designed to be adjustable, so that it can be flexibly adjusted according to needs, thereby improving the flexibility and adaptability of use.

[0051] Furthermore, the mounting base 1 is provided with first adjustment slots 12 on both sides of the U-shaped opening 11 and distributed along the direction of the U-shaped opening 11 ; the switch body 2 is provided with first mounting holes 22 corresponding to the first adjustment slots 12 .

[0052] It also includes a first locking assembly (not shown in the figure); the first locking assembly passes through the first adjustment slot 12 and the first mounting hole 22, and is used to fasten the switch body 2 and the mounting base plate 1 together.

[0053] When adjusting the position, operate the first locking assembly to release the connection between the mounting base 1 and the switch body 2, then slide the switch body 2 along the first adjustment slot 12 to the required position, and then fasten it to the mounting base 1 again through the first locking assembly.

[0054] The first mounting holes 22 may be opened on the flange plates 21 on both sides of the switch body 2 , and there is no specific limitation thereto.

[0055] Furthermore, the mounting base 1 is provided with at least two parallel and spaced first adjustment slots 12 on both sides of the U-shaped opening 11 ; the switch body 2 is provided with at least two first mounting holes 22 corresponding to the first adjustment slots 12 on a one-to-one basis.

[0056] There are at least two first adjustment slots 12 , so that the connection and fixation between the switch body 2 and the mounting base plate 1 is more stable and reliable.

[0057] Furthermore, with respect to the design of the trigger member 4 , it is an L-shaped plate, including a trigger plate body 42 and a mounting plate body 41 .

[0058] The trigger plate 42 is vertically connected to the mounting plate 41 . The trigger plate 42 is used to trigger the switch body 2 . The mounting plate 41 is fixedly connected to the touch plate 3 .

[0059] Furthermore, the trigger member 4 is installed on the touch plate 3 in an adjustable position along the direction of the U-shaped opening 11. The trigger member 4 is designed to be position-adjustable, so that the position can be adjusted according to the installation position of the switch body 2 and the triggering needs, further improving flexibility and adaptability.

[0060] Furthermore, similar to the adjustable position design of the switch body 2 , a second adjustment slot 31 distributed along the direction of the U-shaped opening 11 is provided on the touch plate 3 , and a second mounting hole 411 corresponding to the second adjustment slot 31 is provided on the mounting plate 41 .

[0061] The second locking assembly (not shown) is further included. The second locking assembly passes through the second adjustment slot 31 and the second mounting hole 411 to fasten the mounting plate body 41 and the touch plate 3 together.

[0062] When adjusting the position, operate the second locking assembly to release the connection between the mounting plate body 41 and the touch plate 3, then slide the mounting plate body 41 along the second adjustment slot 31 to the required position, and then operate the second locking assembly to fasten it to the touch plate 3 again.

[0063] Furthermore, the first locking assembly and the second locking assembly both include a locking bolt and a locking nut connected to the locking bolt. The head of the locking bolt and the locking nut are used to compress the two components that need to be fastened together to achieve a fastened connection. This connection method is simple and convenient.

[0064] Furthermore, the length of the touch panel 3 is greater than 400 mm, and the specific length can be adjusted according to actual needs without limitation.

[0065] The application also discloses a steam turbine, comprising a steam turbine body and an automatic main steam valve travel switch for eliminating the influence of heat radiation.

[0066] The above is a detailed introduction to the automatic main steam valve travel switch and steam turbine provided by this application for eliminating the influence of thermal radiation. For general technicians in this field, based on the ideas of the embodiments of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on this application.

Claims

1. An automatic main steam valve travel switch that eliminates the influence of heat radiation, characterized in that: It comprises a U-shaped mounting base plate (1), a touch plate (3) and a switch body (2); The U-shaped opening (11) of the mounting base plate (1) is arranged in the opposite direction of the main steam valve cover (7); The mounting base plate (1) is provided with a switch body (2) mounted on both sides of the U-shaped opening (11); The touch plate (3) is connected to the main steam valve stem (6) via a connecting rod (5) and is arranged along the direction of the U-shaped opening (11); An end of the touch plate (3) away from the main steam valve stem (6) is provided with a triggering member (4) for triggering the switch body (2).

2. The automatic main steam valve travel switch for eliminating the influence of heat radiation according to claim 1, characterized in that: The switch body (2) is mounted on the mounting base plate (1) in an adjustable position along the direction of the U-shaped opening (11).

3. The automatic main steam valve travel switch for eliminating the influence of heat radiation according to claim 2, characterized in that: The mounting base plate (1) is provided with first adjustment slots (12) on both sides of the U-shaped opening (11), respectively, and the first adjustment slots (12) are distributed along the direction of the U-shaped opening (11); The switch body (2) is provided with a first mounting hole (22) corresponding to and connected to the first adjustment slot (12); Also included is a first locking assembly; The first locking assembly passes through the first adjustment slot (12) and the first mounting hole (22) and is used to fasten the switch body (2) and the mounting base plate (1) together.

4. The automatic main steam valve travel switch for eliminating the influence of heat radiation according to claim 3, characterized in that: The mounting base plate (1) is provided with at least two parallel and spaced first adjustment slots (12) on both sides of the U-shaped opening (11); The switch body (2) is provided with at least two first mounting holes (22) that are in one-to-one correspondence with the first adjustment slots (12).

5. The automatic main steam valve travel switch for eliminating the influence of heat radiation according to claim 3, characterized in that: The trigger member (4) is an L-shaped plate, comprising a trigger plate body (42) and a mounting plate body (41); The trigger plate (42) is vertically connected to the mounting plate (41); The trigger plate (42) is used to trigger the switch body (2); The mounting plate body (41) is fixedly connected to the touch plate (3).

6. The automatic main steam valve travel switch for eliminating the influence of heat radiation according to claim 5, characterized in that: The trigger member (4) is mounted on the touch plate (3) in an adjustable position along the direction of the U-shaped opening (11).

7. The automatic main steam valve travel switch for eliminating the influence of heat radiation according to claim 6, characterized in that: The touch plate (3) is provided with a second adjustment slot (31) distributed along the direction of the U-shaped opening (11); The mounting plate (41) is provided with a second mounting hole (411) corresponding to and connected to the second adjustment slot (31); Also included is a second locking assembly; The second locking assembly passes through the second adjustment slot (31) and the second mounting hole (411) and is used to fasten the mounting plate body (41) and the touch plate (3) together.

8. The automatic main steam valve travel switch for eliminating the influence of heat radiation according to claim 7, characterized in that: The first locking assembly and the second locking assembly both include a locking bolt and a locking nut connected to the locking bolt.

9. The automatic main steam valve travel switch for eliminating the influence of heat radiation according to claim 1, characterized in that: The length of the touch plate (3) is greater than 400 mm.

10. A steam turbine, characterized in that: The invention comprises a steam turbine body and an automatic main steam valve travel switch for eliminating the influence of heat radiation as claimed in any one of claims 1 to 9.

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