Hydro-generator rotor overspeed protection device

Abstract

The utility model provides a hydro-generator rotor overspeed protection device, which relates to the technical field of rotor overspeed protection devices and comprises a control bottom plate and a brake mechanism, the brake mechanism is mounted at the top end of the control bottom plate and comprises a speed measuring component and a brake component, the speed measuring component is mounted at the top end of the control bottom plate, and the brake component is mounted at the top end of the control bottom plate. Through the arrangement of the water wheel assembly, when a rotor of the water wheel generator rotates at an overspeed, the speed of the rotor can be reduced through braking, the load can be reduced by reducing the water inflow for speed reduction, and when the frustum-shaped valve element moves downwards, the area of a water inlet in the top end of the throttling pipe is reduced, so that the water wheel assembly is prevented from being damaged. When the water inflow is reduced, the speed measuring assembly transmits the measured speed to the control bottom plate, the control bottom plate sends a throttling command to the linear motor, the linear motor can drive the frustum-shaped valve element to move up and down, the water inflow is changed by changing the size of the water inlet, and the throttling effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotor overspeed protection devices, in particular to a hydro-generator rotor overspeed protection device. Background Art

[0002] The overspeed protection device of the turbine generator rotor is a device specially used to monitor and control the speed of the turbine generator set to prevent equipment damage or safety accidents caused by excessive speed. When the speed of the turbine exceeds the set safety range, the overspeed protection device will automatically intervene and send a signal through the sensor. The control signal will be sent to the starting motor to automatically stop the turbine, thereby achieving the purpose of protecting the turbine.

[0003] After searching, the patent number "CN209761614U" mentioned in the text that "This utility model discloses a water turbine generator set with an overspeed protection device, which relates to the field of hydropower generation technology, including a base with a rectangular cross-section, a water wheel device is arranged on the right side of the base, and a power generation device is arranged on the top of the base, a coupling is arranged on the left side of the water wheel device, and a protection device is arranged on the right side of the power generation device. The utility model has a novel design, and the pressure and flow rate of the water flow at the water inlet pipe are transmitted to the controller through the pressure sensor and the flow rate sensor. When the data value exceeds the rated value, the controller controls the cylinder The connection between the power generation device and the water wheel device is released, which plays a protective role on the power generation device. The rotation speed of the second rotating shaft is measured by the deformation of the elastic element. When the laser receiver receives the signal emitted by the laser transmitter, the controller controls the cylinder to release the connection between the power generation device and the water wheel device, which plays a dual protective role on the power generation device. When it is used, the connection between the power generation device and the water wheel device can be released through the design of the cylinder, which plays a protective role on the power generation device. However, it is not easy to release the connection between the power generation device and the water wheel device in a fast rotation state and it is easy to cause damage to the equipment, and there is no measure to reduce the load.

[0004] Therefore, we provide a hydro-generator rotor overspeed protection device to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a hydro-generator rotor overspeed protection device to solve the problems raised in the above background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a hydro-generator rotor overspeed protection device, comprising a control base plate and a brake mechanism, wherein the brake mechanism is installed at the top of the control base plate;

[0007] The braking mechanism comprises a speed measuring component and a braking component. The speed measuring component is installed on the top of the control base plate, and the braking component is installed on the inner side of the speed measuring component.

[0008] Preferably, the speed measuring assembly includes a generator body, a generator shaft, a brake disc, a speed measuring hole, a shaft bracket, a laser transmitter and a laser receiver; the generator body is installed in the middle position of the top end of the control base plate, the generator shaft is installed on the inner side of the generator body, a brake disc is installed on the outer side of the left end of the generator shaft, a speed measuring hole is opened on the inner side of the brake disc, a shaft bracket is installed on the left side of the top end of the control base plate, a laser transmitter is installed on the right side of the shaft bracket, and a laser receiver is installed on the left side of the shaft bracket.

[0009] Preferably, the generator shaft and the brake disc are connected by a flat key, and the speed measuring hole, the laser transmitter and the laser receiver are at the same distance from the generator shaft.

[0010] Preferably, the brake assembly includes a brake, a brake pump and a brake pad, the brake is installed at the inner bottom end of the rotating shaft bracket, the brake pump is installed on the left side of the brake, and the brake pad is installed on the inner side of the brake.

[0011] Preferably, the brake and the brake pad are movably connected, and the brake pad is installed symmetrically with respect to the brake disc.

[0012] Preferably, a water wheel assembly is installed at the right edge of the top end of the control base plate, and the water wheel assembly includes a water wheel bracket, a water wheel outer box, water wheel blades, a water outlet, a throttling pipe, a T-shaped water inlet pipe, a conical valve core, a connecting rod and a linear motor. A water wheel bracket is welded at the right edge of the top end of the control base plate, a water wheel outer box is welded on the right side of the water wheel bracket, water wheel blades are installed on the inner side of the water wheel outer box, a water outlet is provided at the bottom of the water wheel outer box, a throttling pipe is provided on the upper side of the water wheel outer box, a T-shaped water inlet pipe is installed on the upper side of the throttling pipe, a conical valve core is installed on the inner side of the T-shaped water inlet pipe, a connecting rod is installed on the upper end of the conical valve core, and a linear motor is installed on the top of the connecting rod.

[0013] Preferably, the inner diameter of the throttling tube is smaller than the inner diameter of the T-shaped water inlet pipe, the upper end diameter of the frustum-shaped valve core is larger than the inner diameter of the throttling tube, the upper end diameter of the frustum-shaped valve core is smaller than the inner diameter of the T-shaped water inlet pipe, and the bottom end diameter of the frustum-shaped valve core is smaller than the inner diameter of the throttling tube.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. Through the setting of the water wheel assembly, when the rotor of the hydro-generator rotates at an excessive speed, it is not only necessary to slow down the rotor by braking, but also to reduce the load by reducing the water intake to slow down. When the frustum-shaped valve core moves downward, the area of ​​the water inlet at the top of the throttling tube becomes smaller, and the water intake decreases. The speed measuring assembly transmits the measured speed to the control base plate, and the control base plate issues a throttling command to the linear motor. The linear motor can drive the frustum-shaped valve core to move up and down, and change the water intake by changing the size of the water inlet to achieve the throttling effect.

[0016] 2. Through the setting of the braking mechanism, when the turbine generator rotor rotates rapidly, the generator rotor will drive the generator shaft to rotate rapidly, and the generator shaft will drive the brake disc to rotate rapidly. The laser transmitter emits laser, and the laser passes through the speed measuring hole on the brake disc and is received by the laser receiver. The rotor speed can be accurately measured by the frequency of the received laser signal, and the measured speed can be transmitted to the control base plate. The speed measuring component transmits the measured speed to the control base plate, and the control base plate issues a braking command to the brake pump, and the brake pad is attached to the outside of the brake disc through the brake pump for friction deceleration braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall appearance structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the speed measuring component structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the brake assembly structure of the utility model;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the water wheel assembly of the utility model.

[0021] Numbers in the figure: 1. Control base plate; 2. Braking mechanism; 21. Speed ​​measuring assembly; 211. Generator body; 212. Generator shaft; 213. Brake disc; 214. Speed ​​measuring hole; 215. Shaft bracket; 216. Laser transmitter; 217. Laser receiver; 22. Braking assembly; 221. Brake; 222. Brake pump; 223. Brake pad; 3. Water wheel assembly; 31. Water wheel bracket; 32. Water wheel outer box; 33. Water wheel blade; 34. Water outlet; 35. Throttle pipe; 36. T-shaped water inlet pipe; 37. Cone-shaped valve core; 38. Connecting rod; 39. Linear motor. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Embodiment 1

[0024] See also Figure 1-4 As shown, the utility model provides a technical solution: a hydro-generator rotor overspeed protection device, comprising a control base plate 1 and a brake mechanism 2, wherein the brake mechanism 2 is installed on the top of the control base plate 1;

[0025] The brake mechanism 2 includes a speed measuring component 21 and a brake component 22 . The speed measuring component 21 is installed on the top of the control base plate 1 , and the brake component 22 is installed on the inner side of the speed measuring component 21 .

[0026] Furthermore, the speed measuring component 21 includes a generator body 211, a generator shaft 212, a brake disc 213, a speed measuring hole 214, a shaft bracket 215, a laser transmitter 216 and a laser receiver 217. The generator body 211 is installed at the middle position of the top of the control base plate 1, the generator shaft 212 is installed on the inner side of the generator body 211, the brake disc 213 is installed on the outer side of the left end of the generator shaft 212, and the speed measuring hole 214 is opened on the inner side of the brake disc 213. The shaft bracket 215 is installed on the left side of the top of the control base plate 1, the laser transmitter 216 is installed on the right side of the shaft bracket 215, and the laser receiver 217 is installed on the left side of the shaft bracket 215. When the turbine generator rotor rotates rapidly, the generator rotor will drive the generator shaft 212 to rotate rapidly, and the generator shaft 212 will drive the brake disc 213 to rotate rapidly. The speed of the turbine generator rotor can be accurately measured by the laser transmitter 216 and the laser receiver 217, and the measured speed can be transmitted to the control base plate 1.

[0027] Furthermore, the generator shaft 212 and the brake disc 213 are connected by a flat key, and the speed measuring hole 214, the laser transmitter 216 and the laser receiver 217 are at the same distance from the generator shaft 212. When the turbine generator rotor rotates rapidly, the laser transmitter 216 emits a laser, which passes through the speed measuring hole 214 on the brake disc 213 and is received by the laser receiver 217. The rotation speed of the rotor can be measured by the frequency of the received laser signal.

[0028] Furthermore, the brake assembly 22 includes a brake 221, a brake pump 222 and a brake pad 223. The brake 221 is installed at the inner bottom end of the rotating shaft bracket 215, the brake pump 222 is installed on the left side of the brake 221, and the brake pad 223 is installed on the inner side of the brake 221. When the rotor of the hydro-turbine generator rotates at an excessive speed, it is necessary to slow down the rotor through external braking. The speed measuring assembly 21 transmits the measured speed to the control base plate 1, and the control base plate 1 issues a braking command to the brake pump 222, and the brake pad 223 is attached to the outer side of the brake disc 213 through the brake pump 222 for friction deceleration braking.

[0029] Furthermore, the brake 221 and the brake pad 223 are movably connected, and the brake pad 223 is installed symmetrically about the brake disc 213. When the turbine generator rotor rotates at an excessive speed, the two brake pads 223 are controlled by the brake pump 222 to move toward the brake disc 213, and rub against the brake disc 213 to achieve a braking effect.

[0030] Embodiment 2

[0031] See also Figure 1 , Figure 2 and Figure 4 As shown, in contrast to Example 1, as another implementation of the utility model, a water wheel assembly 3 is installed at the right edge of the top of the control base plate 1, and the water wheel assembly 3 includes a water wheel bracket 31, a water wheel outer box 32, a water wheel blade 33, a water outlet 34, a throttle pipe 35, a T-shaped water inlet pipe 36, a frustum-shaped valve core 37, a connecting rod 38 and a linear motor 39. A water wheel bracket 31 is welded at the right edge of the top of the control base plate 1, a water wheel outer box 32 is welded on the right side of the water wheel bracket 31, a water wheel blade 33 is installed on the inner side of the water wheel outer box 32, a water outlet 34 is opened at the bottom of the water wheel outer box 32, and a throttle pipe 35 is opened on the upper side of the water wheel outer box 32. A T-shaped water inlet pipe 36 is installed on the upper side of the throttling tube 35, a frustum-shaped valve core 37 is installed on the inner side of the T-shaped water inlet pipe 36, a connecting rod 38 is installed on the upper end of the frustum-shaped valve core 37, and a linear motor 39 is installed on the top of the connecting rod 38. When the rotor of the hydro-generator rotates at an excessive speed, it is not only necessary to slow down the rotor by braking, but also to reduce the load by reducing the water intake to slow down. The speed measuring component 21 transmits the measured speed to the control base plate 1, and the control base plate 1 issues a throttling command to the linear motor 39. The linear motor 39 can drive the frustum-shaped valve core 37 to move up and down, and change the water intake by changing the size of the water inlet to achieve the throttling effect.

[0032] Furthermore, the inner diameter of the throttling tube 35 is smaller than the inner diameter of the T-shaped water inlet pipe 36, the upper end diameter of the frustoconical valve core 37 is larger than the inner diameter of the throttling tube 35, the upper end diameter of the frustoconical valve core 37 is smaller than the inner diameter of the T-shaped water inlet pipe 36, the bottom end diameter of the frustoconical valve core 37 is smaller than the inner diameter of the throttling tube 35, and the frustoconical valve core 37 moves up and down in the T-shaped water inlet pipe 36. When moving upward, the area of ​​the water inlet at the top of the throttling tube 35 becomes larger, increasing the water inlet amount. When the frustoconical valve core 37 moves downward, the area of ​​the water inlet at the top of the throttling tube 35 becomes smaller. When the side of the frustoconical valve core 37 is completely in contact with the inner wall of the throttling tube 35, the water inlet is closed.

[0033] Working principle: First, a hydro-turbine generator rotor overspeed protection device is moved to the working position. When in use, in the first step, when the hydro-turbine generator rotor rotates rapidly, the laser transmitter 216 emits a laser, and the laser passes through the speed measuring hole 214 on the brake disc 213 and is received by the laser receiver 217. The rotor speed can be measured by the frequency of the received laser signal and the measured speed can be transmitted to the control base plate 1. In the second step, when the hydro-turbine generator rotor rotates at an excessive speed, the control base plate 1 issues a braking command to the brake pump 222, and the two brake pads 223 are controlled by the brake pump 222 to move toward the brake disc 213, and rub against the brake disc 213 to achieve a braking effect. In the third step, the control base plate 1 issues a throttling command to the linear motor 39, and the linear motor 39 can drive the conical valve core 37 to move up and down, and change the water inlet by changing the size of the water inlet to achieve a throttling effect.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydro-generator rotor overspeed protection device, comprising a control base plate (1) and a brake mechanism (2), characterized in that: A braking mechanism (2) is installed on the top of the control base plate (1); The braking mechanism (2) comprises a speed measuring component (21) and a braking component (22); the speed measuring component (21) is installed on the top of the control base plate (1), and the braking component (22) is installed on the inner side of the speed measuring component (21).

2. A hydro-generator rotor overspeed protection device according to claim 1, characterized in that: The speed measuring assembly (21) comprises a generator body (211), a generator shaft (212), a brake disc (213), a speed measuring hole (214), a shaft bracket (215), a laser transmitter (216) and a laser receiver (217); the generator body (211) is installed at the middle position of the top end of the control base plate (1); the generator shaft (212) is installed on the inner side of the generator body (211); the brake disc (213) is installed on the outer side of the left end of the generator shaft (212); the speed measuring hole (214) is opened on the inner side of the brake disc (213); the shaft bracket (215) is installed on the left side of the top end of the control base plate (1); the laser transmitter (216) is installed on the right side of the shaft bracket (215); and the laser receiver (217) is installed on the left side of the shaft bracket (215).

3. A hydro-generator rotor overspeed protection device according to claim 2, characterized in that: The generator shaft (212) and the brake disc (213) are connected by a flat key, and the speed measuring hole (214), the laser transmitter (216) and the laser receiver (217) are equidistant from the generator shaft (212).

4. A hydro-generator rotor overspeed protection device according to claim 2, characterized in that: The brake assembly (22) comprises a brake (221), a brake pump (222) and a brake pad (223); the brake (221) is installed at the inner bottom end of the rotating shaft bracket (215); the brake pump (222) is installed on the left side of the brake (221); and the brake pad (223) is installed on the inner side of the brake (221).

5. A hydro-generator rotor overspeed protection device according to claim 4, characterized in that: The brake (221) and the brake pad (223) are movably connected, and the brake pad (223) is installed symmetrically with respect to the brake disc (213).

6. A hydro-generator rotor overspeed protection device according to claim 1, characterized in that: A water wheel assembly (3) is installed at the right edge of the top end of the control base plate (1), and the water wheel assembly (3) comprises a water wheel bracket (31), a water wheel outer box (32), a water wheel blade (33), a water outlet (34), a throttle pipe (35), a T-shaped water inlet pipe (36), a frustum-shaped valve core (37), a connecting rod (38) and a linear motor (39). The water wheel bracket (31) is welded at the right edge of the top end of the control base plate (1), and the water wheel outer box (32) is welded on the right side of the water wheel bracket (31). A water wheel blade (33) is installed on the inner side of the water wheel outer box (32), a water outlet (34) is provided at the bottom of the water wheel outer box (32), a throttle pipe (35) is provided on the upper side of the water wheel outer box (32), a T-shaped water inlet pipe (36) is installed on the upper side of the throttle pipe (35), a frustum-shaped valve core (37) is installed on the inner side of the T-shaped water inlet pipe (36), a connecting rod (38) is installed on the upper end of the frustum-shaped valve core (37), and a linear motor (39) is installed on the top end of the connecting rod (38).

7. A hydro-generator rotor overspeed protection device according to claim 6, characterized in that: The inner diameter of the throttling tube (35) is smaller than the inner diameter of the T-shaped water inlet pipe (36), the upper end diameter of the frustum-shaped valve core (37) is larger than the inner diameter of the throttling tube (35), the upper end diameter of the frustum-shaped valve core (37) is smaller than the inner diameter of the T-shaped water inlet pipe (36), and the bottom end diameter of the frustum-shaped valve core (37) is smaller than the inner diameter of the throttling tube (35).

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