Overspeed protection device of steam turbine

Abstract

The invention provides an overspeed protection device of a steam turbine. The connecting frame is fixedly mounted on one side of the outer surface of the speed reduction ring, a rotating pipe is fixedly connected to the middle of the connecting frame, and a rotating block is fixedly connected to one side of the outer surface of the rotating pipe; the rotating plate is fixedly connected to the middle of the outer surface of the rotating pipe, and friction blocks are fixedly mounted on the two sides of the outer surface of the rotating plate; and the extrusion device is arranged at the top of the outer surface of the speed reduction ring and comprises a fixed rod, a mounting plate, a first hydraulic cylinder, a connecting rod, a movable plate and a wear-resistant pad. According to the overspeed protection device for the steam turbine, the output shaft of the first hydraulic cylinder moves to push the abrasion-resistant pad and the friction block to rub, the speed reduction effect is achieved, the device is simple in structure and high in practicability, the abrasion-resistant pad and the friction block are not prone to damage during friction, the service life of the protection device is prolonged, and the practicability of the device is improved.

Description

Technical Field

[0001] The invention relates to the field of steam turbines, and in particular to an overspeed protection device for steam turbines. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated airflow and is then sprayed onto the blades, causing the rotor with the blade rows to rotate and perform work externally. Steam turbines are the main equipment in modern thermal power plants.

[0003] Since the steam turbine is a high-speed rotating device, the centrifugal force of the rotating parts is proportional to the square of the rotational speed. When the steam turbine rotates at an overspeed, the centrifugal force will exceed the strength limit allowed by the material, thereby damaging the parts.

[0004] The existing publication number is CN217462280U, which is a steam turbine overspeed protection device. When the rotor of the steam turbine rotates, it can drive the rotating rod to rotate. When the rotor of the steam turbine rotates at an overspeed, the rotating rod can rotate quickly, so that the reduction block can be thrown outward, and the first elastic member is stretched accordingly, so that the reduction block contacts the inner wall of the reduction ring, thereby increasing the friction force, so that the speed of the steam turbine rotor is slowed down to a certain extent. However, when the elastic member is thrown out and the reduction block rubs against the inner wall of the reduction ring, the elastic member may be damaged, and the elastic member needs to be replaced frequently, increasing the maintenance cost of the device.

[0005] Therefore, it is necessary to provide a steam turbine overspeed protection device to solve the above technical problems. Summary of the invention

[0006] The invention provides a steam turbine overspeed protection device, which solves the problem that when the elastic part is thrown out of the speed reduction block and rubs against the inner wall of the speed reduction ring, the elastic part is damaged, and the elastic part needs to be replaced frequently, which increases the maintenance cost of the device.

[0007] In order to solve the above technical problems, the present invention provides a steam turbine overspeed protection device, comprising: a reduction ring;

[0008] A connecting frame, the connecting frame is fixedly mounted on one side of the outer surface of the reduction ring, a rotating tube is fixedly connected to the middle of the connecting frame, and a rotating block is fixedly connected to one side of the outer surface of the rotating tube;

[0009] A rotating plate, the rotating plate is fixedly connected to the middle of the outer surface of the rotating tube, and friction blocks are fixedly installed on both sides of the outer surface of the rotating plate;

[0010] The extrusion device is arranged on the top of the outer surface of the reduction ring, and the extrusion device includes a fixed rod, a mounting plate, a first hydraulic cylinder, a connecting rod, a moving plate and a wear-resistant pad.

[0011] Preferably, the fixed rod is fixedly installed on one side of the top of the reduction ring, the mounting plate is fixedly installed on the top of the fixed rod, the first hydraulic cylinder is fixedly installed on one side of the top of the mounting plate, the connecting rod is fixedly connected to the bottom end of the output shaft of the first hydraulic cylinder, the movable plate is fixedly connected to the bottom end of the connecting rod, and the wear-resistant pad is fixedly connected to the bottom of the movable plate.

[0012] Preferably, a connecting tube is fixedly installed in the middle of the bottom of the rotating block, and a knocking device is slidably installed in the middle of the bottom of the connecting tube.

[0013] Preferably, a base is fixedly mounted on the bottom of the reduction ring, and support blocks are fixedly mounted on both sides of the outer surface of the base.

[0014] Preferably, an alarm device is fixedly installed in the middle of the base surface, and the alarm device includes an installation box, an alarm instrument, a signal transmission device and a controller. The installation box is fixedly installed in the middle of one side of the outer surface of the base, the alarm instrument is fixedly installed in the middle of the top of the installation box, the signal transmission device is fixedly installed on one side of the top of the installation box, and the controller is fixedly installed on the other side of the outer surface of the installation box.

[0015] Preferably, the wear-resistant pad and the friction block are both made of rubber.

[0016] Preferably, the bottom end of the connecting rod extends into the interior of the deceleration ring and is connected to the top of the moving plate.

[0017] Compared with the related art, the steam turbine overspeed protection device provided by the present invention has the following beneficial effects:

[0018] The present invention provides a steam turbine overspeed protection device, which achieves a deceleration effect by moving the output shaft of a first hydraulic cylinder to push a wear-resistant pad and a friction block to rub. The device has a simple structure and strong practicality. The wear-resistant pad and the friction block are not easily damaged during friction, thereby extending the service life of the protection device and improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a first embodiment of a steam turbine overspeed protection device provided by the present invention;

[0020] Figure 2 for Figure 1 A schematic side view of the reduction ring shown;

[0021] Figure 3 for Figure 2 An enlarged schematic diagram of point A is shown.

[0022] Numbers in the figure: 1. reduction ring, 2. connecting frame, 3. rotating tube, 4. rotating plate, 5. friction block, 6. extrusion device, 61. fixed rod, 62. mounting plate, 63. first hydraulic cylinder, 64. connecting rod, 65. movable plate, 66. wear-resistant pad, 7. rotating block, 8. alarm device, 81. mounting box, 82. alarm instrument, 83. signal transmission device, 84. controller, 9. base, 10. support block, 11. connecting tube, 12. knocking device, 13. fixing frame, 14. second hydraulic cylinder, 15. slot opening, 16. tripod, 17. moving wheel, 18. battery, 19. connecting slot. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0024] First embodiment

[0025] Please refer to Figure 1 , Figure 2 and Figure 3 ,in, Figure 1 A schematic structural diagram of a first embodiment of a steam turbine overspeed protection device provided by the present invention; Figure 2 for Figure 1 A schematic side view of the reduction ring shown;

[0026] Figure 3 for Figure 2 The enlarged schematic diagram of point A is shown. A steam turbine overspeed protection device comprises: a speed reduction ring 1;

[0027] A connecting frame 2, the connecting frame 2 is fixedly installed on one side of the outer surface of the reduction ring 1, a rotating tube 3 is fixedly connected to the middle of the connecting frame 2, and a rotating block 7 is fixedly connected to one side of the outer surface of the rotating tube 3;

[0028] A rotating plate 4, the rotating plate 4 is fixedly connected to the middle of the outer surface of the rotating tube 3, and friction blocks 5 are fixedly installed on both sides of the outer surface of the rotating plate 4;

[0029] The extrusion device 6 is arranged at the top of the outer surface of the reduction ring 1 , and the extrusion device 6 includes a fixing rod 61 , a mounting plate 62 , a first hydraulic cylinder 63 , a connecting rod 64 , a moving plate 65 and a wear-resistant pad 66 .

[0030] The fixed rod 61 is fixedly installed on one side of the top of the reduction ring 1, the mounting plate 62 is fixedly installed on the top of the fixed rod 61, the first hydraulic cylinder 63 is fixedly installed on one side of the top of the mounting plate 62, the connecting rod 64 is fixedly connected to the bottom end of the output shaft of the first hydraulic cylinder 63, the movable plate 65 is fixedly connected to the bottom end of the connecting rod 64, and the wear-resistant pad 66 is fixedly connected to the bottom of the movable plate 65.

[0031] A connecting tube 11 is fixedly installed in the middle of the bottom of the rotating block 7, and a knocking device 12 is slidably installed in the middle of the bottom of the connecting tube 11.

[0032] A base 9 is fixedly mounted on the bottom of the reduction ring 1 , and support blocks 10 are fixedly mounted on both sides of the outer surface of the base 9 .

[0033] An alarm device 8 is fixedly installed in the middle of the surface of the base 9, and the alarm device 8 includes an installation box 81, an alarm instrument 82, a signal transmission device 83 and a controller 84. The installation box 81 is fixedly installed in the middle of one side of the outer surface of the base 9, the alarm instrument 82 is fixedly installed in the middle of the top of the installation box 81, the signal transmission device 83 is fixedly installed on one side of the top of the installation box 81, and the controller 84 is fixedly installed on the other side of the outer surface of the installation box 81.

[0034] The wear-resistant pad 66 and the friction block 5 are both made of rubber.

[0035] The bottom end of the connecting rod 64 extends into the interior of the deceleration ring 1 and is connected to the top of the moving plate 65 .

[0036] The working principle of a steam turbine overspeed protection device provided by the present invention is as follows:

[0037] During operation, first, as the rotating plate 4 rotates, the knocking device 12 intermittently knocks the controller 84 to achieve an alarm effect.

[0038] As the alarm instrument 82 sounds, the output shaft of the first hydraulic cylinder 63 is controlled by an external power source to move the connecting rod 64 and the movable plate 65, and the wear-resistant pad 66 approaches the friction block 5. The rotating plate 4 drives the friction block 5 to rotate the intermittent friction wear-resistant pad 66 to achieve a friction deceleration effect.

[0039] Compared with the related art, the steam turbine overspeed protection device provided by the present invention has the following beneficial effects:

[0040] The present invention provides a steam turbine overspeed protection device, which achieves a deceleration effect by moving the output shaft of the first hydraulic cylinder 63 to push the wear-resistant pad 6 and the friction block 5 to rub. The device has a simple structure and strong practicality. The wear-resistant pad 6 and the friction block 5 are not easily damaged when rubbing, thereby extending the service life of the protection device and improving the practicality of the device.

[0041] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A steam turbine overspeed protection device, characterized in that: include: Speed ​​reduction ring; A connecting frame, the connecting frame is fixedly mounted on one side of the outer surface of the reduction ring, a rotating tube is fixedly connected to the middle of the connecting frame, and a rotating block is fixedly connected to one side of the outer surface of the rotating tube; A rotating plate, the rotating plate is fixedly connected to the middle of the outer surface of the rotating tube, and friction blocks are fixedly installed on both sides of the outer surface of the rotating plate; The extrusion device is arranged on the top of the outer surface of the reduction ring, and the extrusion device includes a fixed rod, a mounting plate, a first hydraulic cylinder, a connecting rod, a moving plate and a wear-resistant pad.

2. A steam turbine overspeed protection device according to claim 1, characterized in that: The fixed rod is fixedly installed on one side of the top of the reduction ring, the mounting plate is fixedly installed on the top of the fixed rod, the first hydraulic cylinder is fixedly installed on one side of the top of the mounting plate, the connecting rod is fixedly connected to the bottom end of the output shaft of the first hydraulic cylinder, the movable plate is fixedly connected to the bottom end of the connecting rod, and the wear-resistant pad is fixedly connected to the bottom of the movable plate.

3. A steam turbine overspeed protection device according to claim 1, characterized in that: A connecting cylinder is fixedly installed in the middle of the bottom of the rotating block, and a knocking device is slidably installed in the middle of the bottom of the connecting cylinder.

4. A steam turbine overspeed protection device according to claim 1, characterized in that: A base is fixedly installed at the bottom of the speed reduction ring, and support blocks are fixedly installed on both sides of the outer surface of the base.

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