Super speed protection device for steam turbine

Abstract

This utility model relates to the field of steam turbine technology and discloses an overspeed protection device for steam turbines, including a bracket with a receiving box attached to it. This utility model controls the oil delivery ball to transfer lubricating oil from the top of the oil tank to the bottom of the oil tank in real time, following the rotational speed of the steam turbine rotor. The lubricating oil transferred to the bottom of the oil tank then flows through an oil outlet pipe, a diversion pipe, and several guide pipes into the space between the reduction ring and the rotating seat. This achieves real-time lubrication between the reduction ring and the rotating seat based on the rotational speed of the steam turbine rotor, reducing the impact of rotational friction between the reduction ring and the rotating seat on the actual rotational speed of the steam turbine rotor. This avoids interference with the actual operation of the steam turbine due to the overspeed protection device, thus further improving the performance of the overspeed protection device to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, specifically to an overspeed protection device for steam turbines. Background Technology

[0002] A steam turbine, also known as a steam engine, is a rotary steam power unit. High-temperature, high-pressure steam passes through a fixed nozzle, becomes an accelerated airflow, and is then injected onto the blades, causing the rotor, which is equipped with blades, to rotate and perform work. Steam turbines are the main equipment in modern thermal power plants. Because steam turbines are high-speed rotating devices, the centrifugal force of the rotating parts is proportional to the square of the rotational speed. When a steam turbine rotates at overspeed, its centrifugal force will exceed the strength limit allowed by the materials, thereby damaging the components. Therefore, overspeed protection devices are usually installed on steam turbines to protect the components.

[0003] Traditional overspeed protection devices for steam turbines rely solely on springs to eject the speed reduction block, causing friction between it and the speed reduction ring for deceleration protection. However, this spring-ejection method leads to unstable contact between the speed reduction block and the speed reduction ring, causing them to disengage during the frictional rotation. This results in poor deceleration protection for the steam turbine and consequently, poor performance of the existing overspeed protection devices, making them unsuitable for practical use. Utility Model Content

[0004] This utility model provides an overspeed protection device for steam turbines, which solves the problem mentioned in the background art that the existing overspeed protection device uses a spring to pop out the deceleration block, which causes unstable contact between the deceleration block and the deceleration ring, resulting in the deceleration block and the deceleration ring separating during frictional rotation.

[0005] This utility model provides the following technical solution: an overspeed protection device for steam turbines, including a bracket, a receiving box being snapped onto the bracket, a deceleration ring being connected to the side wall of the top of the bracket, a controller being fixedly installed on the deceleration ring, a rotating seat being rotatably sleeved on the outer side wall of the deceleration ring, a mounting bracket being inserted into the rotating seat, and a deceleration assembly being installed on the rotating seat. An auxiliary component for use with the deceleration assembly is installed on the deceleration assembly. The deceleration assembly includes a fixed box fixedly installed on the rotating seat, and the deceleration assembly is installed together with the auxiliary component through the fixed box. One end of the fixed box is rotatably connected to the inner wall of the deceleration ring, and a speed detector is sleeved on the side wall of one end of the fixed box.

[0006] Preferably, a threaded rod is rotatably connected to the inner wall of the fixed box, and the outer walls at both ends of the threaded rod are provided with helical threads in opposite directions. Two drive frames are threadedly sleeved on the outer walls of the threaded rod. Both sides of the drive frames are slidably connected to the inner wall of the fixed box, and both ends of the drive frames penetrate the inner wall of the fixed box and are fixedly connected to a speed reduction block.

[0007] Preferably, a synchronous pulley is sleeved on the threaded rod, and a synchronous pulley is also rotatably connected to the inner cavity of the fixed box, and a synchronous belt body is connected between the outer walls of the two synchronous pulleys.

[0008] Preferably, a drive motor is fixedly installed on the side wall of one side of the synchronous pulley, and the drive motor is fixedly connected to the inner wall of the fixed box.

[0009] Preferably, the auxiliary component includes a diverter pipe fixedly installed on the inner wall of the deceleration ring, an oil outlet pipe and several oil guide pipes installed on the diverter pipe, and the oil outlet pipe and several oil guide pipes all extend to the outside of the deceleration ring. A valve is installed on the oil outlet pipe, an oil tank is sleeved on the outer wall of the oil outlet pipe, and an oil delivery ball is rotatably connected to the oil tank.

[0010] Preferably, the oil drum has an oil inlet hole, and a sealing plug is slidably connected to the inner cavity of the oil inlet hole.

[0011] Preferably, a pulley is fixedly connected to the side wall of one end of the oil delivery ball, and a pulley is also rotatably connected to the side wall of the deceleration ring. One end of the pulley on one side passes through the side wall of the deceleration ring and is fixedly connected to the side wall of the fixed box, and a belt body is connected between the outer side walls of the two pulleys.

[0012] This utility model has the following beneficial effects: 1. This utility model controls the forward rotation of the threaded rod to cause the two drive frames to drive the two reduction blocks to unfold to both sides, so that the two reduction blocks can quickly and firmly fit against the inner wall of the reduction ring. This achieves the effect of quickly adjusting the position of the two reduction blocks, so that the two reduction blocks can always rub and rotate on the inner wall of the reduction ring to decelerate and protect the steam turbine. This avoids the unstable contact between the reduction blocks and the reduction ring in existing overspeed protection devices, which can cause the reduction blocks to detach during the frictional rotation of the reduction ring, resulting in poor deceleration protection effect of existing overspeed protection devices for steam turbines. Therefore, this invention significantly improves the performance of the overspeed protection device to a certain extent, thus benefiting its practical use.

[0013] 2. This utility model controls the oil delivery ball to transfer the lubricating oil from the top of the oil tank to the bottom of the oil tank in real time, following the rotation speed of the turbine rotor. The lubricating oil transferred to the bottom of the oil tank then flows into the space between the reduction ring and the rotating seat through the oil outlet pipe, the diversion pipe, and several guide pipes. This achieves the effect of lubricating the space between the reduction ring and the rotating seat in real time according to the rotation speed of the turbine rotor. This reduces the impact of the rotational friction between the reduction ring and the rotating seat on the actual rotation speed of the turbine rotor, and avoids the problem of interference with the actual working effect of the turbine due to the setting of the overspeed protection device. In this way, it further helps to improve the performance of the overspeed protection device to a certain extent. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0015] Figure 2 This is a rear-view three-dimensional structural diagram of the present invention.

[0016] Figure 3 This is a cross-sectional perspective view of a portion of the components of this utility model.

[0017] Figure 4 This is a cross-sectional perspective view of the speed reduction assembly and auxiliary assembly of this utility model.

[0018] Figure 5 For the present utility model Figure 4 Enlarged 3D structural diagram at point A.

[0019] In the diagram: 1. Bracket; 2. Receiving box; 3. Reduction ring; 4. Reduction assembly; 41. Fixed box; 42. Drive frame; 43. Threaded rod; 44. Reduction block; 45. Drive motor; 46. Synchronous pulley; 47. Synchronous belt body; 5. Auxiliary components; 51. Diverter pipe; 52. Oil guide pipe; 53. Oil outlet pipe; 54. Valve; 55. Oil tank; 56. Oil delivery ball; 57. Sealing plug; 58. Belt body; 59. Pulley; 6. Speed ​​sensor; 7. Rotating seat; 8. Controller; 9. Mounting bracket. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] This utility model provides an overspeed protection device for steam turbines, such as... Figures 1-5 As shown, the device includes a bracket 1, on which a receiving box 2 is snapped. A reduction ring 3 is connected to the side wall of the top of the bracket 1, and a controller 8 is fixedly installed on the reduction ring 3. The controller 8 allows for quick activation of the electronic components of the overspeed protection device. A rotating seat 7 is rotatably sleeved on the outer side wall of the reduction ring 3, and a mounting bracket 9 is inserted into the rotating seat 7. By inserting the mounting bracket 9, which matches the turbine rotor, into the rotating seat 7, the overspeed protection device can be installed together with the turbine rotor for use, causing the turbine rotor to synchronously drive the rotating seat 7 and the fixed box 41. The rotating base 7 is equipped with a speed reduction assembly 4, which allows for quick adjustment of the positions of the two speed reduction blocks 44. This ensures that the two speed reduction blocks 44 can always rotate and rub against the inner wall of the speed reduction ring 3 to slow down and protect the turbine. The speed reduction assembly 4 is equipped with an auxiliary assembly 5 that works in conjunction with the speed reduction assembly 4. The auxiliary assembly 5 can lubricate the speed reduction ring 3 and the rotating base 7 in real time according to the speed at which the turbine rotor drives the rotating base 7 to rotate, thereby reducing the impact of the rotational friction between the speed reduction ring 3 and the rotating base 7 on the actual rotational speed of the turbine rotor. The deceleration assembly 4 includes a fixed box 41 fixedly installed on the rotating seat 7. The deceleration assembly 4 is installed together with the auxiliary assembly 5 through the fixed box 41. One end of the fixed box 41 is rotatably connected to the inner wall of the deceleration ring 3. A speed measuring device 6 is sleeved on the side wall of one end of the fixed box 41. Through the speed measuring device 6 installed on the fixed box 41, the speed measuring device 6 can detect the rotation speed of the turbine rotor in real time. At the same time, when the speed measuring device 6 detects that the rotation speed of the turbine rotor is overspeeding, the speed measuring device 6 can also quickly transmit the signal to the controller 8 so that the controller 8 can quickly make a series of responses.

[0022] In a further preferred embodiment of this utility model, such as Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, a threaded rod 43 is rotatably connected to the inner wall of the fixed box 41, and the outer walls at both ends of the threaded rod 43 are provided with spiral threads in opposite directions. Two drive frames 42 are threadedly sleeved on the outer walls of the threaded rod 43. Both sides of the drive frames 42 are slidably connected to the inner wall of the fixed box 41, and both ends of the drive frames 42 penetrate the inner wall of the fixed box 41 and are fixedly connected to a reduction block 44. By controlling the threaded rod 43 to rotate in the forward direction, the threaded rod 43 drives the two drive frames 42 to unfold to both sides, so that the two drive frames 42 can quickly drive the two reduction blocks 44 to unfold to both sides and fit against the inner wall of the reduction ring 3, thereby achieving the purpose of quickly adjusting the position of the two reduction blocks 44.

[0023] In a further preferred embodiment of this utility model, such as Figure 4 and Figure 5 As shown, a synchronous pulley 46 is sleeved on the threaded rod 43, and a synchronous pulley 46 is also rotatably connected to the inner cavity of the fixed box 41. A synchronous belt body 47 is connected between the outer walls of the two synchronous pulleys 46. By controlling the synchronous pulley 46 on the right to rotate in the forward direction, the synchronous pulley 46 can drive the synchronous pulley 46 on the left to rotate in the forward direction synchronously through the synchronous belt body 47. In this way, the synchronous pulley 46 on the left can quickly drive the threaded rod 43 to rotate in the forward direction.

[0024] In a further preferred embodiment of this utility model, such as Figure 4 and Figure 5 As shown, a drive motor 45 is fixedly installed on the side wall of the synchronous pulley 46 on one side, and the drive motor 45 is fixedly connected to the inner wall of the fixed box 41. The drive motor 45 is started by the controller 8, so that the drive motor 45 can quickly drive the synchronous pulley 46 on the right side to rotate in the forward direction when the power is on.

[0025] In a further preferred embodiment of this utility model, such as Figures 1-4 As shown, the auxiliary component 5 includes a diversion pipe 51 fixedly installed on the inner wall of the deceleration ring 3. An oil outlet pipe 53 and several oil guide pipes 52 are installed on the diversion pipe 51, and both the oil outlet pipe 53 and the oil guide pipes 52 extend to the outside of the deceleration ring 3. A valve 54 is installed on the oil outlet pipe 53, and an oil tank 55 is sleeved on the outer wall of the oil outlet pipe 53. An oil delivery ball 56 is rotatably connected to the oil tank 55. By controlling the oil delivery ball 56 to rotate with the turbine rotor, the oil delivery ball 56 is made to deliver oil according to the rotational speed of the turbine rotor. The lubricating oil at the top of the drum 55 is transferred to the bottom of the drum 55. The lubricating oil transferred to the bottom of the drum 55 flows into the distribution pipe 51 through the oil outlet pipe 53. The lubricating oil flowing into the distribution pipe 51 then flows into the space between the deceleration ring 3 and the rotating seat 7 through several oil guide pipes 52. This achieves the purpose of lubricating the space between the deceleration ring 3 and the rotating seat 7 in real time according to the speed at which the turbine rotor drives the rotating seat 7 to rotate. At the same time, the valve 54 can control the opening and closing of the oil outlet pipe 53.

[0026] In a further preferred embodiment of this utility model, such as Figures 1-4 As shown, an oil inlet hole is provided on the oil drum 55, and a sealing plug 57 is slidably connected to the inner cavity of the oil inlet hole. By pulling the sealing plug 57 out of the inside of the oil inlet hole, the operator can add an appropriate amount of lubricating oil into the inside of the oil drum 55 through the oil inlet hole.

[0027] In a further preferred embodiment of this utility model, such as Figures 1-4As shown, a pulley 59 is fixedly connected to the side wall of one end of the oil delivery ball 56, and a pulley 59 is also rotatably connected to the side wall of the reduction ring 3. One end of the pulley 59 on one side passes through the side wall of the reduction ring 3 and is fixedly connected to the side wall of the fixed box 41. A belt body 58 is connected between the outer side walls of the two pulleys 59. When the turbine rotor drives the rotating seat 7 and the fixed box 41 to rotate synchronously, the fixed box 41 can drive the bottom pulley 59 to rotate synchronously. When the bottom pulley 59 rotates, it can drive the top pulley 59 to rotate synchronously through the belt body 58. In this way, the top pulley 59 can quickly drive the oil delivery ball 56 to rotate with the turbine rotor.

[0028] In this embodiment, when using the overspeed protection device to protect components on the turbine, the operator first fixes the overspeed protection device to the turbine rotor side through the mounting screw holes on the bracket 1. Next, the operator inserts the matching mounting bracket 9 onto the rotating seat 7 according to the turbine rotor, and then installs the overspeed protection device together with the turbine rotor using the mounting bracket 9. Then, the operator pulls the sealing plug 57 out of the oil inlet hole, adds an appropriate amount of lubricating oil into the oil tank 55, pushes the sealing plug 57 back into the oil inlet hole, and opens the valve 54. Finally, the operator powers the electronic components of the overspeed protection device through an external power source and starts the turbine. During operation, the lubricating oil inside the oil tank 55 flows into the space between the reduction ring 3 and the rotating seat 7, following the rotation speed of the turbine rotor. This lubricates the rotating seat 7, which rotates on the reduction ring 3. Simultaneously, the receiving box 2, attached to the bracket 1, collects the lubricating oil flowing between the reduction ring 3 and the rotating seat 7, preventing waste. When the speed sensor 6 detects that the turbine rotor's rotation speed exceeds the limit, it transmits a signal to the controller 8. At this time, the controller 8 starts the drive motor 45, causing the two reduction blocks 44 to adhere to the inner wall of the reduction ring 3, thus providing speed reduction protection for the turbine and preventing damage to turbine components due to overspeed rotation.

[0029] 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.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An overspeed protection device for steam turbines, comprising a bracket (1), characterized in that: The bracket (1) is fitted with a receiving box (2), and a deceleration ring (3) is connected to the side wall of the top of the bracket (1). A controller (8) is fixedly installed on the deceleration ring (3), and a rotating seat (7) is rotatably sleeved on the outer side wall of the deceleration ring (3). A mounting bracket (9) is inserted into the rotating seat (7), and a deceleration assembly (4) is installed on the rotating seat (7). An auxiliary assembly (5) that works with the deceleration assembly (4) is installed on the deceleration assembly (4). The deceleration assembly (4) includes a fixed box (41) fixedly installed on the rotating seat (7), and the deceleration assembly (4) is installed together with the auxiliary assembly (5) through the fixed box (41). One end of the fixed box (41) is rotatably connected to the inner wall of the deceleration ring (3), and a speed measuring device (6) is sleeved on the side wall of one end of the fixed box (41).

2. The overspeed protection device for steam turbines according to claim 1, characterized in that: A threaded rod (43) is rotatably connected to the inner wall of the fixed box (41), and the outer walls at both ends of the threaded rod (43) are provided with spiral threads in opposite directions. Two drive frames (42) are threadedly sleeved on the outer walls of the threaded rod (43). Both sides of the drive frames (42) are slidably connected to the inner wall of the fixed box (41), and both ends of the drive frames (42) penetrate the inner wall of the fixed box (41) and are fixedly connected to a speed reduction block (44).

3. The overspeed protection device for steam turbines according to claim 2, characterized in that: A synchronous pulley (46) is sleeved on the threaded rod (43), and a synchronous pulley (46) is also rotatably connected to the inner cavity of the fixed box (41), and a synchronous belt body (47) is connected between the outer walls of the two synchronous pulleys (46).

4. The overspeed protection device for steam turbines according to claim 3, characterized in that: A drive motor (45) is fixedly installed on the side wall of the synchronous pulley (46) on one side, and the drive motor (45) is fixedly connected to the inner wall of the fixed box (41).

5. The overspeed protection device for steam turbines according to claim 1, characterized in that: The auxiliary component (5) includes a diversion pipe (51) fixedly installed on the inner wall of the deceleration ring (3). The diversion pipe (51) is equipped with an oil outlet pipe (53) and several oil guide pipes (52), and the oil outlet pipe (53) and several oil guide pipes (52) extend to the outside of the deceleration ring (3). A valve (54) is installed on the oil outlet pipe (53). An oil tank (55) is sleeved on the outer wall of the oil outlet pipe (53), and an oil delivery ball (56) is rotatably connected to the oil tank (55).

6. The overspeed protection device for steam turbines according to claim 5, characterized in that: The oil drum (55) has an oil inlet hole, and the inner cavity of the oil inlet hole is slidably connected with a sealing plug (57).

7. The overspeed protection device for steam turbines according to claim 5, characterized in that: A pulley (59) is fixedly connected to the side wall of one end of the oil delivery ball (56), and a pulley (59) is also rotatably connected to the side wall of the deceleration ring (3). One end of the pulley (59) on one side passes through the side wall of the deceleration ring (3) and is fixedly connected to the side wall of the fixed box (41). A belt body (58) is connected between the outer side walls of the two pulleys (59).

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