Steam exhaust connection for a steam turbine

Abstract

The present application relates to steam turbine power plant technical field, specifically for a kind of steam turbine's steam discharge connecting device, including machine body, one end of machine body is communicated with control pipe, the end of control pipe away from machine body is communicated with connecting pipe, the end of connecting pipe away from control pipe is communicated with communicating pipe, control pipe is provided with control mechanism, control mechanism includes cylinder fixed on the outside of control pipe, the output end of cylinder is fixed with push rod, the end of push rod away from cylinder is fixed with connecting column, connecting column is through control pipe and extends to its inside, this kind of steam turbine's steam discharge connecting device, by setting cylinder drive sector plate rotation, cooperate with the linkage structure of wedge and inclined groove, can be according to steam turbine load variation real-time adjustment steam flow area, realize the accurate control of exhaust steam flow, compared with traditional mechanical positioning or manual adjustment, the response speed of the present application is fast, and the adjustment linearity is high, effectively avoid the problem of running economy decline caused by back pressure sharp fluctuation.

Description

Technical Field

[0001] This invention relates to the field of steam turbine power generation equipment technology, specifically to a steam exhaust connection device for a steam turbine. Background Technology

[0002] The steam exhaust connection device of a steam turbine is a key component connecting the exhaust cylinder of the steam turbine and the condenser. Its function is to build a stable steam flow channel and smoothly guide the exhaust steam after it has done work into the condenser for cooling and condensation. Existing connection devices are usually composed of components such as connecting pipes, flanges, expansion joints and valves, and realize steam transportation through rigid or semi-rigid connections. However, in actual operation, the steam turbine load fluctuates frequently and the steam parameters change dynamically accordingly. Existing connection devices are difficult to accurately control the steam exhaust process. From a mechanical structure perspective, traditional expansion joints use bellows to compensate for thermal displacement, but their stiffness is nonlinear, resulting in uneven expansion and contraction under varying operating conditions. This generates additional axial force on the valve core of the regulating valve, causing the valve stem to jam or not close tightly. Furthermore, the lack of flow guiding or rectifying structures inside the connecting pipe leads to eddies and pulsating pressure generated by steam flow, which directly affect the regulating mechanism, exacerbating the nonlinearity of regulation and mechanical vibration. These mechanical problems collectively prevent existing connecting devices from achieving wide-load, high-precision steam emission regulation. Therefore, we propose a steam emission connecting device for steam turbines. Summary of the Invention

[0003] One of the technical problems to be solved in this application is: how to design a steam discharge connection device for a steam turbine with adjustable steam discharge.

[0004] To solve the above-mentioned technical problems, this application provides a steam discharge connection device for a steam turbine, including a body, one end of the body is connected to a control pipe, the end of the control pipe away from the body is connected to a connecting pipe, the end of the connecting pipe away from the control pipe is connected to a connecting pipe, and a control mechanism is provided on the control pipe. The control mechanism includes a cylinder fixed to the outside of the control tube. A push rod is fixed to the output end of the cylinder. A connecting post is fixed to the end of the push rod away from the cylinder. The connecting post passes through the control tube and extends into its interior. A sector plate is fixed to the end of the connecting post located inside the control tube.

[0005] In some embodiments, a straight groove is provided on the sector plate, and a wedge block is slidably connected inside the straight groove. A connecting plate is fixed on the side of the wedge block away from the sector plate, and a guide rod is fixed on the connecting plate. A spring is sleeved on the outside of the guide rod, one end of the spring abuts against the connecting plate, and the other end of the spring abuts against the inner wall of the control tube.

[0006] In some embodiments, an installation groove is provided on the inner wall of the control tube, a rotating plate is rotatably connected inside the installation groove, a rotating rod is fixed in the middle of the rotating plate, both ends of the rotating rod are rotatably connected to the control tube, and a sealing ring is fixed on the side wall of the rotating plate, the sealing ring being sealed to the inner wall of the control tube.

[0007] In some embodiments, an arc-shaped groove is provided on the rotating plate, and an arc-shaped rod is slidably connected inside the arc-shaped groove. A fixing plate is fixed to one end of the arc-shaped rod, and the fixing plate is fixed to the inner wall of the control tube. A tension spring is sleeved on the outer side of the arc-shaped rod, with one end of the tension spring fixed to the fixing plate and the other end of the tension spring fixed to the rotating plate.

[0008] In some embodiments, the arc surface of the sector plate is provided with an inclined groove, the wedge block is slidably engaged with the inclined groove, and the side of the wedge block facing the rotating plate is provided with an inclined guide surface. When the sector plate moves, the wedge block is driven to slide along the straight groove through the inclined groove.

[0009] In some embodiments, a baffle is fixed inside the control tube, and a limiting groove is formed on the baffle. The connecting column passes through the limiting groove and slides in cooperation with the limiting groove. The baffle is located between the fan-shaped plate and the connecting plate.

[0010] In some embodiments, a fixing cylinder is sleeved on the outside of the connecting pipe, the fixing cylinder is fixedly connected to the machine body, an installation ring is provided inside the fixing cylinder, the installation ring is sleeved on the outside of the connecting pipe, and a sealing gasket is provided between the installation ring and the fixing cylinder.

[0011] In some embodiments, a fixing ring is fixed on the inner wall of the control tube. The fixing ring is located on the side of the sector plate away from the baffle, and the fixing ring is sealed to the end face of the sector plate to limit the maximum rotation angle of the sector plate.

[0012] The present invention has at least the following beneficial effects: 1. By setting a cylinder to drive the sector plate to rotate, and cooperating with the linkage structure of the wedge block and the inclined groove, the steam flow area can be adjusted in real time according to the turbine load change, so as to achieve precise control of the exhaust steam flow. Compared with the traditional mechanical positioning or manual adjustment, the present invention has a fast response speed and high adjustment linearity, effectively avoiding the problem of reduced operating economy caused by drastic back pressure fluctuations. 2. By setting the arc groove on the rotating plate to cooperate with the arc rod, and setting the spring between the sector plate and the connecting plate, the control mechanism can adaptively buffer the steam pulsation pressure under changing working conditions, which significantly reduces the risk of valve stem jamming and incomplete closure. At the same time, the multi-point sealing cooperation between the sealing ring and the fixed ring reduces the interference of mechanical vibration on the control accuracy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the control tube and connecting tube of the present invention; Figure 3 This is a schematic diagram of the structure of the fixed cylinder, cylinder, and push rod of the present invention; Figure 4 This is an exploded structural diagram of the push rod, sector plate, and connecting column of the present invention; Figure 5 for Figure 4 A magnified structural diagram at point A; Figure 6 This is a cross-sectional structural diagram of the connecting column of the present invention; Figure 7 This is a schematic diagram of the structure of the sector plate, connecting column, sealing ring, and arc rod of the present invention; Figure 8 This is a schematic diagram of the structure of the sector plate, arc rod, and rotating plate of the present invention.

[0014] In the diagram: 1. Body; 2. Control pipe; 3. Connecting pipe; 4. Through pipe; 5. Control mechanism; 51. Cylinder; 52. Push rod; 53. Connecting column; 54. Sector plate; 55. Straight groove; 56. Wedge block; 57. Connecting plate; 58. Guide rod; 59. Spring; 510. Mounting groove; 511. Rotating plate; 512. Rotating rod; 513. Sealing ring; 514. Arc groove; 515. Inclined groove; 516. Arc rod; 517. Fixed plate; 518. Baffle; 519. Limiting groove; 520. Fixed ring; 521. Tension spring; 6. Fixed cylinder; 7. Mounting ring. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0016] Please see Figure 1-8 The present invention provides a technical solution: a steam discharge connection device for a steam turbine, comprising a body 1, one end of the body 1 being connected to a regulating pipe 2, the end of the regulating pipe 2 away from the body 1 being connected to a connecting pipe 3, the end of the connecting pipe 3 away from the regulating pipe 2 being connected to a connecting pipe 4, and a regulating mechanism 5 being provided on the regulating pipe 2. The control mechanism 5 includes a cylinder 51 fixed to the outside of the control tube 2. A push rod 52 is fixed to the output end of the cylinder 51. A connecting post 53 is fixed to the end of the push rod 52 away from the cylinder 51. The connecting post 53 passes through the control tube 2 and extends into its interior. A fan-shaped plate 54 is fixed to the end of the connecting post 53 located inside the control tube 2. The end of the connecting pipe 3 away from the control pipe 2 is connected to the phase pipe 4. The control pipe 2 is equipped with a control mechanism 5. During operation, steam is discharged from the machine body 1 and enters the downstream condenser after passing through the control pipe 2, the connecting pipe 3 and the phase pipe 4 in sequence. The control mechanism 5 is used to adjust the steam flow area in real time to adapt to the variable load operation requirements of the steam turbine.

[0017] A straight groove 55 is provided on the sector plate 54. A wedge block 56 is slidably connected inside the straight groove 55. A connecting plate 57 is fixed on the side of the wedge block 56 away from the sector plate 54. A guide rod 58 is fixed on the connecting plate 57. A spring 59 is sleeved on the outside of the guide rod 58. One end of the spring 59 abuts against the connecting plate 57, and the other end of the spring 59 abuts against the inner wall of the control tube 2. A straight groove 55 is provided on the sector plate 54. A wedge block 56 is slidably connected inside the straight groove 55. A connecting plate 57 is fixed on the side of the wedge block 56 away from the sector plate 54. A guide rod 58 is fixed on the connecting plate 57. A spring 59 is sleeved on the outside of the guide rod 58. One end of the spring 59 abuts against the connecting plate 57, and the other end of the spring 59 abuts against the inner wall of the regulating pipe 2. When the sector plate 54 moves, the wedge block 56 slides along the straight groove 55 under the action of the inclined groove 515, which drives the connecting plate 57 to compress or release the spring 59. The force of the spring 59 can buffer the impact of steam pulsation and prevent the regulating mechanism from jamming.

[0018] An installation groove 510 is provided on the inner wall of the control tube 2. A rotating plate 511 is rotatably connected inside the installation groove 510. A rotating rod 512 is fixed in the middle of the rotating plate 511. Both ends of the rotating rod 512 are rotatably connected to the control tube 2. A sealing ring 513 is fixed on the side wall of the rotating plate 511. The sealing ring 513 is sealed and fitted with the inner wall of the control tube 2. An installation groove 510 is provided on the inner wall of the control pipe 2. A rotating plate 511 is rotatably connected inside the installation groove 510. A rotating rod 512 is fixed in the middle of the rotating plate 511. Both ends of the rotating rod 512 are rotatably connected to the control pipe 2. A sealing ring 513 is fixed on the side wall of the rotating plate 511. The sealing ring 513 is sealed and fitted with the inner wall of the control pipe 2. The rotating plate 511 rotates around the rotating rod 512 under the push of the fan-shaped plate 54, thereby assisting in opening or closing the steam passage. The sealing ring 513 always fits against the inner wall of the control pipe 2, effectively preventing steam from leaking from the edge of the rotating plate 511.

[0019] An arc-shaped groove 514 is provided on the rotating plate 511. An arc-shaped rod 516 is slidably connected inside the arc-shaped groove 514. A fixed plate 517 is fixed to one end of the arc-shaped rod 516. The fixed plate 517 is fixed to the inner wall of the control tube 2. A tension spring 521 is sleeved on the outer side of the arc-shaped rod 516. One end of the tension spring 521 is fixed to the fixed plate 517, and the other end of the tension spring 521 is fixed to the rotating plate 511. An arc-shaped groove 514 is provided on the rotating plate 511. An arc-shaped rod 516 is slidably connected inside the arc-shaped groove 514. A fixed plate 517 is fixed to one end of the arc-shaped rod 516. The fixed plate 517 is fixed to the inner wall of the control tube 2. A tension spring 521 is sleeved on the outside of the arc-shaped rod 516. One end of the tension spring 521 is fixed to the fixed plate 517, and the other end of the tension spring 521 is fixed to the rotating plate 511. When the fan-shaped plate 54 retracts, the tension spring 521 pulls the rotating plate 511 to reset, so that it returns to the initial closed position. The cooperation between the arc-shaped rod 516 and the arc-shaped groove 514 limits the swing angle range of the rotating plate 511, ensuring smooth and reliable operation.

[0020] A sloping groove 515 is provided on the arc surface of the sector plate 54. The wedge block 56 slides in the sloping groove 515, and an inclined guide surface is provided on the side of the wedge block 56 facing the rotating plate 511. When the sector plate 54 moves, the wedge block 56 is driven to slide along the straight groove 55 through the sloping groove 515. The inclined groove 515 and the inclined surface of the wedge block 56 are provided in the arc surface of the sector plate 54, and the wedge block 56 slides in the sloping groove 515. An inclined guide surface is provided on the side of the wedge block 56 facing the rotating plate 511. When the sector plate 54 moves, the wedge block 56 is driven to slide along the straight groove 55 through the sloping groove 515. The inclined groove 515 and the inclined surface of the wedge block 56 convert the circumferential movement of the sector plate 54 into the radial movement of the wedge block 56. Then, the mechanical displacement is converted into a controllable elastic preload through the connecting plate 57 and the spring 59, which improves the linearity and stability of the adjustment.

[0021] The control tube 2 also has a baffle 518 fixed inside. The baffle 518 has a limiting groove 519. The connecting column 53 passes through the limiting groove 519 and slides in cooperation with the limiting groove 519. The baffle 518 is located between the sector plate 54 and the connecting plate 57. The baffle 518 guides the movement direction of the connecting column 53 to prevent the connecting column 53 from deflecting under the impact of high temperature and high pressure steam. At the same time, the end of the limiting groove 519 can limit the maximum extension distance of the connecting column 53 to avoid the sector plate 54 from rotating excessively and damaging the sealing structure.

[0022] A fixing cylinder 6 is fitted on the outside of the connecting pipe 3. The fixing cylinder 6 is fixedly connected to the machine body 1. An installation ring 7 is provided inside the fixing cylinder 6. The installation ring 7 is fitted on the outside of the connecting pipe 3, and a sealing gasket is provided between the installation ring 7 and the fixing cylinder 6. The fixing cylinder 6 and the installation ring 7 together constitute the support and sealing structure of the connecting pipe 3, allowing the connecting pipe 3 to slide slightly axially during thermal expansion. At the same time, the sealing gasket ensures the airtightness of the connection.

[0023] A fixing ring 520 is fixed on the inner wall of the control tube 2. The fixing ring 520 is located on the side of the sector plate 54 away from the baffle 518, and the fixing ring 520 is sealed to the end face of the sector plate 54 to limit the maximum rotation angle of the sector plate 54. The fixing ring 520 is fixed on the inner wall of the control tube 2. The fixing ring 520 is located on the side of the sector plate 54 away from the baffle 518, and the fixing ring 520 is sealed to the end face of the sector plate 54 to limit the maximum rotation angle of the sector plate 54 and form an auxiliary sealing surface, further improving the control accuracy and sealing reliability.

[0024] Working principle: After steam is discharged from the machine body 1, it enters the control pipe 2, flows through the control pipe 2, the connecting pipe 3 and the connecting pipe 4 in sequence, and finally enters the downstream condenser. The control mechanism 5 adjusts the steam flow area in real time according to the changes in the turbine load. After receiving the control signal, the cylinder 51 drives the push rod 52 to extend and retract. The push rod 52 drives the connecting column 53 to move along the limiting groove 519 on the baffle 518. The sector plate 54 at the end of the connecting column 53 rotates in the regulating tube 2. The arc surface of the sector plate 54 is provided with a slanted groove 515. The wedge block 56 slides with the slanted groove 515. The side of the wedge block 56 facing the rotating plate 511 is provided with an inclined guide surface. When the sector plate 54 rotates, the slanted groove 515 forces the wedge block 56 to slide radially along the straight groove 55 on the sector plate 54. The wedge block 56 drives the connecting plate 57 and the guide rod 58 to move. The connecting plate 57 compresses or releases the spring 59 sleeved on the outside of the guide rod 58. The force of the spring 59 acts in the opposite direction on the connecting plate 57 to buffer the steam pulsation impact and prevent the regulating mechanism from jamming. As the sector plate 54 rotates, its end face pushes the rotating plate 511. The rotating plate 511 is installed in the mounting groove 510 on the inner wall of the control pipe 2 via the rotating rod 512 and can rotate around the rotating rod 512. When the rotating plate 511 rotates, it changes the opening area between itself and the inner wall of the control pipe 2, thereby adjusting the steam flow rate. A sealing ring 513 is fixed on the side wall of the rotating plate 511. The sealing ring 513 always fits against the inner wall of the control pipe 2 to prevent steam leakage. An arc groove 514 is also provided on the rotating plate 511. The arc rod 516 slides in the arc groove 514. The fixing plate 517 at the end of the arc rod 516 is fixed to the inner wall of the control pipe 2. One end of the tension spring 521 sleeved on the outside of the arc rod 516 is connected to the fixing plate 517, and the other end is connected to the rotating plate 511. When the sector plate 54 retracts, the tension spring 521 pulls the rotating plate 511 back to the initial closed position; the fixing ring 520 on the inner wall of the regulating pipe 2 is sealed to the end face of the sector plate 54, limiting the maximum rotation angle of the sector plate 54 and forming an auxiliary sealing surface; the connecting pipe 3 is fitted with a fixing cylinder 6 and an mounting ring 7 on the outside, and a sealing gasket is provided between the mounting ring 7 and the fixing cylinder 6, allowing the connecting pipe 3 to slide axially when it expands thermally while ensuring airtightness.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A steam discharge connection device for a steam turbine, comprising a body (1), characterized in that: One end of the body (1) is connected to a control tube (2), the end of the control tube (2) away from the body (1) is connected to a connecting tube (3), the end of the connecting tube (3) away from the control tube (2) is connected to a connecting tube (4), and a control mechanism (5) is provided on the control tube (2). The control mechanism (5) includes a cylinder (51) fixed to the outside of the control tube (2). A push rod (52) is fixed to the output end of the cylinder (51). A connecting column (53) is fixed to the end of the push rod (52) away from the cylinder (51). The connecting column (53) passes through the control tube (2) and extends into its interior. A fan-shaped plate (54) is fixed to the end of the connecting column (53) inside the control tube (2).

2. The steam discharge connection device for a steam turbine according to claim 1, characterized in that: A straight groove (55) is provided on the fan-shaped plate (54). A wedge block (56) is slidably connected inside the straight groove (55). A connecting plate (57) is fixed on the side of the wedge block (56) away from the fan-shaped plate (54). A guide rod (58) is fixed on the connecting plate (57). A spring (59) is sleeved on the outside of the guide rod (58). One end of the spring (59) abuts against the connecting plate (57), and the other end of the spring (59) abuts against the inner wall of the control tube (2).

3. The steam discharge connection device for a steam turbine according to claim 2, characterized in that: The inner wall of the control tube (2) is provided with an installation groove (510). A rotating plate (511) is rotatably connected inside the installation groove (510). A rotating rod (512) is fixed in the middle of the rotating plate (511). Both ends of the rotating rod (512) are rotatably connected to the control tube (2). A sealing ring (513) is fixed on the side wall of the rotating plate (511). The sealing ring (513) is sealed to the inner wall of the control tube (2).

4. The steam discharge connection device for a steam turbine according to claim 3, characterized in that: The rotating plate (511) has an arc-shaped groove (514) and an arc-shaped rod (516) is slidably connected inside the arc-shaped groove (514). One end of the arc-shaped rod (516) is fixed with a fixing plate (517). The fixing plate (517) is fixed to the inner wall of the control tube (2). A tension spring (521) is sleeved on the outside of the arc-shaped rod (516). One end of the tension spring (521) is fixed to the fixing plate (517), and the other end of the tension spring (521) is fixed to the rotating plate (511).

5. The steam discharge connection device for a steam turbine according to claim 3, characterized in that: The arc surface of the sector plate (54) is provided with a sloping groove (515), the wedge (56) slides with the sloping groove (515), and the wedge (56) is provided with an inclined guide surface on the side facing the rotating plate (511). When the sector plate (54) moves, it drives the wedge (56) to slide along the straight groove (55) through the sloping groove (515).

6. The steam discharge connection device for a steam turbine according to claim 5, characterized in that: The control tube (2) is also fixed with a baffle (518), and a limiting groove (519) is opened on the baffle (518). The connecting column (53) passes through the limiting groove (519) and slides with the limiting groove (519). The baffle (518) is located between the fan-shaped plate (54) and the connecting plate (57).

7. The steam discharge connection device for a steam turbine according to claim 1, characterized in that: A fixing cylinder (6) is sleeved on the outside of the connecting pipe (3). The fixing cylinder (6) is fixedly connected to the machine body (1). An installation ring (7) is provided inside the fixing cylinder (6). The installation ring (7) is sleeved on the outside of the connecting pipe (3), and a sealing gasket is provided between the installation ring (7) and the fixing cylinder (6).

8. The steam discharge connection device for a steam turbine according to claim 1, characterized in that: A fixing ring (520) is fixed on the inner wall of the control tube (2). The fixing ring (520) is located on the side of the sector plate (54) away from the baffle (518), and the fixing ring (520) is sealed to the end face of the sector plate (54) to limit the maximum rotation angle of the sector plate (54).

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