Manual mechanical locking device of steam turbine intermediate pressure cylinder steam exhaust butterfly valve

Abstract

The utility model discloses a manual mechanical locking device of an intermediate pressure cylinder steam exhaust butterfly valve of a steam turbine, which is connected with a valve rod through a transition shaft, the transition shaft is coaxially connected with the valve rod, and the manual mechanical locking device comprises a shifting fork structure detachably connected with the side surface of the end part of the transition shaft and a manual actuating mechanism capable of driving the shifting fork structure to swing back and forth, the manual executing mechanism drives the shifting fork structure to swing in a reciprocating mode and drives the transition shaft to rotate forwards and reversely so as to drive the valve rod to rotate, and the valve rod drives the disc fixed to the valve rod to rotate so as to control opening and closing / adjusting of the valve. Therefore, the reliability of the steam exhaust butterfly valve of the medium-pressure cylinder is improved, the valve can be controlled through the manual executing mechanism under the condition that the electric executing mechanism breaks down, the situation that a steam turbine generator unit stops and eliminates defects due to the fact that the executing mechanism breaks down is avoided, and the reliability and economical efficiency of the steam turbine generator unit are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, and in particular to a manual mechanical locking device for the exhaust butterfly valve of the intermediate pressure cylinder of a steam turbine. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media. A butterfly valve is characterized by its closing element (valve disc or butterfly plate) being a disk that rotates around the valve stem (the disc is fixed to the valve stem) to achieve opening and closing. Valves can be used to control the flow of various types of fluids, including air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media. In pipelines, they primarily function as shut-off and throttling devices. The butterfly valve's opening and closing element is a disc-shaped butterfly plate that rotates within the valve body around its own axis (valve stem) to achieve opening, closing, or regulation.

[0003] Existing turbine intermediate-pressure cylinder exhaust butterfly valves typically rely solely on an electric actuator connected to the valve stem, which drives the stem rotation to achieve opening, closing, or regulation. This electric actuator can be a motor or a worm gear mechanism. However, when the electric actuator malfunctions, it can no longer control the valve's opening, closing, or regulation, forcing the turbine generator unit to shut down. This shutdown not only disrupts production continuity but also causes significant economic losses, reducing the reliability and economy of the turbine generator unit. Therefore, it is urgently necessary to implement a manual backup mechanism for controlling the intermediate-pressure cylinder exhaust butterfly valve to prevent forced turbine generator unit shutdowns due to electric actuator failures. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a manual mechanical locking device for the exhaust butterfly valve of the intermediate pressure cylinder of a steam turbine.

[0005] This utility model proposes a manual mechanical locking device for the exhaust butterfly valve of the intermediate pressure cylinder of a steam turbine. It is connected to the valve stem via a transition shaft and includes a fork structure detachably connected to the side of the end of the transition shaft and a manual actuator capable of driving the fork structure to swing back and forth. The manual actuator drives the fork structure to swing back and forth, drives the transition shaft to rotate in both directions, and then drives the valve stem to rotate. The valve stem drives a disk fixed to it to rotate, thereby controlling the opening and closing / adjustment of the valve.

[0006] Preferably, the manual actuator includes a lead screw, a slider, and a guide rod. The shift fork structure is fixed on the slider. The lead screw and the guide rod are arranged in parallel. The slider is provided with a threaded hole that is threaded to the lead screw and a through hole that cooperates with the guide rod. When the lead screw is manually driven to rotate, the rotational motion is converted into linear motion, which drives the slider to move back and forth along the axis of the lead screw, and in turn drives the shift fork structure to swing back and forth.

[0007] Preferably, the end of the shift fork structure is connected to the side of the transition shaft end by bolts.

[0008] Preferably, the outer frame of the manual actuator is welded and fixed to the valve neck support of the butterfly valve.

[0009] Preferably, the transition shaft includes a valve body side section, a middle section, and a valve stem side section, forming a three-section structure. The outer diameter of the valve body side section is Φ180mm, the diameter of the middle opening is Φ100mm, and it is welded and fixed to the first end of the middle section. The outer diameter of the middle section is Φ165mm, and a middle hole with a diameter of Φ90mm is opened in the middle of the first and second ends. An internal thread is machined in the middle hole of the second end of the middle section, and the side of the middle section is connected to the valve stem through a key I. The first end of the valve stem side section is provided with an external thread that is threaded to the internal thread of the middle section, and the side of the second end is connected to the electric actuator through a key II.

[0010] Preferably, the threaded connection between the intermediate section and the valve stem side section is welded, and a locking pin is inserted into the side.

[0011] In summary, this utility model has the following beneficial effects: by setting a manual actuator to drive the fork structure to swing back and forth, driving the transition shaft to rotate in both directions, and then driving the valve stem to rotate, the valve stem drives the fixed disc to rotate, thereby controlling the opening and closing / regulation of the valve. This improves the reliability of the medium-pressure cylinder exhaust butterfly valve. In the event of a failure of the electric actuator, the valve can be controlled by the manual actuator, avoiding shutdown of the turbine generator set due to actuator failure, and greatly improving the reliability and economy of the turbine generator set. Through the specially designed transmission transition shaft and manual actuator, manual operation is achieved in emergency situations, which is simple to operate and easy to maintain.

[0012] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0013] Figure 1 This is a simplified structural diagram of the manual mechanical locking device for the exhaust butterfly valve of the intermediate pressure cylinder of a steam turbine, according to an embodiment of this utility model.

[0014] Figure 2 This is a schematic diagram of the transition shaft in an embodiment of the present invention.

[0015] In the picture:

[0016] 1. Transition shaft; 11. Valve body side section; 12. Intermediate section; 13. Valve stem side section; 2. Fork structure; 3. Manual actuator; 31. Lead screw; 32. Slider; 33. Guide rod; 4. Anti-reverse pin. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] like Figure 1-2 As shown in the figure, the manual mechanical locking device for the exhaust butterfly valve of the intermediate pressure cylinder of a steam turbine proposed in this embodiment is connected to the valve stem through a transition shaft 1. It includes a fork structure 2 detachably connected to the side of the end of the transition shaft 1 and a manual actuator 3 capable of driving the fork structure 2 to swing back and forth. The manual actuator 3 drives the fork structure 2 to swing back and forth, drives the transition shaft 1 to rotate in both directions, and then drives the valve stem to rotate. The valve stem drives the disk fixed to it to rotate, so as to control the opening and closing / regulation of the valve.

[0019] Specifically, the end of the shift fork structure 2 is connected to the side of the end of the transition shaft 1 by bolts.

[0020] The outer frame of the manual actuator 3 is welded and fixed to the valve neck support of the butterfly valve.

[0021] This improves the reliability of the intermediate-pressure cylinder exhaust butterfly valve. In the event of a failure of the electric actuator, the valve can be controlled by the manual actuator 3, avoiding shutdown of the turbine generator set due to actuator failure and greatly improving the reliability and economy of the turbine generator set. Through the specially designed transmission transition shaft 1 and the manual actuator 3, manual operation is realized in emergency situations, which is simple to operate and easy to maintain.

[0022] Furthermore, such as Figure 1 As shown, the manual actuator 3 includes a lead screw 31, a slider 32, and a guide rod 33. The shift fork structure 2 is fixed on the slider 32. The lead screw 31 and the guide rod 33 are arranged in parallel. The slider 32 is provided with a threaded hole that is threaded to the lead screw 31 and a through hole that cooperates with the guide rod 33. When the lead screw 31 is manually driven to rotate, the rotational motion is converted into linear motion, which drives the slider 32 to move back and forth along the axis of the lead screw 31, and then drives the shift fork structure 2 to swing back and forth.

[0023] Specifically, since the shift fork structure 2 is designed as a symmetrical structure, there are two of each of the lead screw 31, guide rod 33 and slider 32, which makes the drive more stable.

[0024] When the electric actuator malfunctions, the valve is first limited by the manual actuator 3, then the electric actuator is disengaged, and the valve is then regulated and controlled by the manual actuator 3. Specifically, for ease of operation, a ring handle is installed on the drive end of the lead screw 31.

[0025] In this embodiment, as Figure 2 As shown, the transition shaft 1 includes a valve body side section 11, a middle section 12, and a valve stem side section 13, forming a three-section structure. The outer diameter of the valve body side section 11 is Φ180mm, the diameter of the central opening is Φ100mm, and it is welded and fixed to the first end of the middle section 12, ensuring a firm connection, guaranteeing welding quality, and preventing loosening. The outer diameter of the middle section 12 is Φ165mm, and both the first and second ends have a central hole with a diameter of Φ90mm. The central hole at the second end of the middle section 12 is machined with an internal thread, and the side of the middle section 12 is connected to the valve stem via a key I. The first end of the valve stem side section 13 has an external thread that connects with the internal thread of the middle section 12, and the side of the second end is connected to the electric actuator via a key II. Specifically, the side of the middle section 12 and the side of the second end of the valve stem side section 13 are also machined with keyways that mate with the keys. The lengths of both key I and key II are 25mm.

[0026] Furthermore, the threaded connection between the intermediate section 12 and the valve stem side section 13 is welded, and a check pin 4 is inserted into the side. Specifically, the diameter of the check pin 4 is set to Φ16mm.

[0027] Furthermore, a transition flange is also installed on the outer side of the valve stem side section 13, on which the support bearing of the electric actuator is mounted (e.g., Figure 2 (Point A in the middle is where the support bearing is installed), ensuring that the dimensions of each machined component are compatible.

[0028] It should be noted that the electric actuator controls the opening and closing / regulation of the valve by connecting the key II to the second end of the valve stem side section 13. When the electric actuator fails, the valve is first limited by the manual actuator 3, then the electric actuator is disengaged from the valve stem side section 13 of the transition shaft 1, and the manual actuator 3 is used as a backup to regulate the valve. This avoids the problem of forced shutdown of the turbine generator unit due to the lack of backup valve control when the electric actuator fails.

[0029] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A hand mechanical lock position device for a steam turbine IP cylinder exhaust gate characterized in that, The valve stem is connected with a transition shaft, a shift fork structure is detachably connected with the end side of the transition shaft, and a manual actuating mechanism is capable of driving the shift fork structure to reciprocate, the manual actuating mechanism drives the shift fork structure to reciprocate, drives the transition shaft to rotate in forward and reverse directions, and further drives the valve stem to rotate, the valve stem drives a disc fixed therewith to rotate, so as to control the opening and closing / regulating of the valve.

2. The manual mechanical latching device for IP cylinder exhaust butterfly valve of steam turbine as claimed in claim 1, wherein, The manual actuating mechanism comprises a screw rod, a sliding block and a guide rod, the shift fork structure is fixed on the sliding block, the screw rod and the guide rod are arranged in parallel, the sliding block is provided with a threaded hole in threaded connection with the screw rod and a through hole in cooperation with the guide rod, when the screw rod is manually driven to rotate, the rotary motion is converted into linear motion, the sliding block is driven to reciprocate along the screw rod in the axial direction, and further drives the shift fork structure to reciprocate.

3. The manual mechanical latching device for IP cylinder exhaust butterfly valve of steam turbine as claimed in claim 2, wherein, The end of the shift fork structure is connected with the end side of the transition shaft through a bolt.

4. The manual mechanical latching device for IP cylinder exhaust butterfly valve of steam turbine as claimed in claim 1, wherein, An outer frame of the manual actuating mechanism is welded and fixed with a valve neck support of the butterfly valve.

5. The manual mechanical latching device for IP cylinder exhaust butterfly valve of steam turbine as claimed in claim 1, wherein, The transition shaft comprises a valve body side section, an intermediate section and a valve stem side section, forming a three-section structure, the valve body side section is provided with an outer diameter of Φ180 mm, an intermediate aperture with a diameter of Φ100 mm and is welded and fixed with the first end of the intermediate section, the intermediate section is provided with an outer diameter of Φ165 mm, intermediate holes with a diameter of Φ90 mm are arranged in the end portions of the first end and the second end, an internal thread is processed in the intermediate hole of the second end of the intermediate section, the side portion of the intermediate section is connected with the valve stem through a key I, the valve stem side section is provided with an external thread in threaded connection with the internal thread of the intermediate section at the first end, and the side portion of the second end is connected with the electric actuating mechanism through a key II.

6. The manual mechanical latching device for IP cylinder exhaust butterfly valve of steam turbine as claimed in claim 5, wherein, The threaded connection portions of the intermediate section and the valve stem side section are welded and a retreat prevention pin is inserted in the side portion.

Images