Novel impulse turbine brake device

Abstract

The utility model discloses a novel impulse turbine brake device which is characterized in that the center of a power generation rotating wheel disc is connected with a main shaft of a generator, a plurality of power generation water buckets are arranged around the power generation rotating wheel disc, an annular water distribution pipe is arranged on the outer sides of the power generation water buckets in the circumferential direction, and a plurality of power generation water spraying devices are arranged on the inner side of the annular water distribution pipe; a plurality of brake water buckets are arranged on the brake rotating wheel disc in a surrounding mode, a water pipe is arranged on one side of the end of the annular water distribution pipe, and a brake spray pipe is arranged at the tail end of the water pipe. When the power generation water turbine works, the braking water turbine shrinks in the concave cavity of the power generation rotating wheel disc, and power generation is not affected; when the power generation water wheel stops or breaks down, the brake shaft is controlled by the hydraulic operating mechanism to extend and drive the brake water turbine to enter a brake station, and the hydraulic needle valve on the brake spray pipe is opened, so that the impulse water turbine is quickly braked. The device effectively improves the braking efficiency and the operation stability of the impulse turbine, and is worthy of being vigorously popularized in future impulse power stations.

Description

Technical Field

[0001] The utility model relates to the field of rotating machinery braking, in particular to a novel impact type water turbine braking device. Background Art

[0002] According to the operation requirements of the hydropower station, when the impulse turbine unit is shut down normally or abnormally unloaded, in order to quickly reduce the unit speed and avoid damage to the safe and stable operation of the unit due to the turbine being in a high-speed running state for a long time, the supporting turbine speed control system will be put into use in time to brake the unit.

[0003] At present, the common speed control system of impulse turbine mainly adopts the following measures to brake the unit: the speed control system controls the needle in the nozzle to move slowly in the closing direction, and at the same time opens the deflector at the front end of the nozzle to change the impact direction of the water flow, thereby reducing the impact of the water flow on the bucket, that is, reducing the active torque of the impulse turbine. This braking method not only requires the needle and the deflector to maintain a certain cooperative relationship, but also has high requirements for the speed control system. At the same time, the braking efficiency is relatively low, and the impulse turbine cannot be braked quickly in a short time.

[0004] Based on the above situation, the utility model proposes a multi-point riveting device for a new energy electromagnetic cooler cover plate to effectively solve the above problems. Utility Model Content

[0005] In order to solve the problems existing in the background technology, the utility model provides a novel impulse water turbine braking device.

[0006] The utility model adopts the following technical solutions:

[0007] A novel impulse water turbine braking device comprises a generator main shaft, a power generation wheel disc, an electric water spray device and a water turbine braking device. The center of the power generation wheel disc is connected to the generator main shaft, and a plurality of power generation water buckets are arranged around it. An annular water distribution pipe is arranged on the outer circumference of the power generation water bucket, and a plurality of power generation water spray devices are arranged on the inner side of the annular water distribution pipe. The power generation water spray device comprises a power generation water spray pipe and a power generation nozzle arranged at the front end of the power generation water spray pipe.

[0008] The water turbine braking device includes a brake shaft, a brake rotor disc, and a brake water bucket. One end of the brake shaft is connected to the power generation rotor disc, and the other end is connected to the brake rotor disc. A plurality of brake water buckets are arranged around the brake rotor disc. A water pipe is arranged on one side of the end of the annular water distribution pipe, and a brake nozzle is arranged at the end of the water pipe.

[0009] Furthermore, the brake nozzle includes a brake water inlet pipe and a brake nozzle arranged at the end of the brake water inlet pipe.

[0010] Furthermore, a water valve is provided between the end of the annular water distribution pipe and the water pipe on one side of the end.

[0011] Furthermore, the diameter of the brake rotor disc is smaller than that of the power generation rotor disc.

[0012] Furthermore, the water-facing working surface of the braking bucket faces the opposite direction to the water-facing working surface of the power generating bucket.

[0013] Furthermore, the brake shaft is provided with a hydraulic operating mechanism or an electric mechanism, so that the brake shaft together with the brake rotor disc and the brake water bucket can perform telescopic movement along the axial direction.

[0014] Furthermore, one side of the generator rotor disc connected to the brake shaft is a concave cavity, and when the brake shaft is contracted to the shortest length, the brake rotor disc and the brake water bucket are arranged in the concave cavity.

[0015] Furthermore, the brake shaft includes a fixed shaft and a telescopic shaft with one end arranged inside the fixed shaft. A cavity for storing hydraulic oil is arranged inside the fixed shaft. The brake shaft is connected to an external hydraulic operating mechanism through inlet and outlet oil pipelines.

[0016] Furthermore, the hydraulic operating mechanism mainly includes an electric motor, a pressure oil pump, an oil filter, a flow regulating valve, an electromagnetic reversing valve, an oil overflow valve and an oil return tank. When the braking device needs to enter / exit, the hydraulic operating mechanism is started and the electromagnetic reversing valve changes the direction of the oil circuit to control the brake shaft to extend or retract.

[0017] Furthermore, the brake water inlet valve is a hydraulic needle valve.

[0018] The utility model provides a new type of impulse turbine braking device: when the power generation turbine works normally, the brake turbine shrinks in the concave cavity of the power generation wheel disc, which will not affect its normal power generation; when the power generation turbine stops or the load is dumped due to an accident, the hydraulic operating mechanism controls the extension of the brake shaft and drives the brake turbine to enter the braking position, and at the same time opens the hydraulic needle valve on the brake nozzle, so that the water flow impacts the brake bucket through the brake nozzle to provide a braking torque opposite to the normal power generation direction, thereby realizing the rapid braking of the impulse turbine. This device can effectively improve the braking efficiency and operating stability of the impulse turbine, and is worthy of being vigorously promoted in future impulse power stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a top view of a new type of impulse water turbine braking device;

[0020] Figure 2 This is the side view of the normal power generation state;

[0021] Figure 3 Side view of the brake state

[0022] Figure 4 It is a three-dimensional axonometric diagram of normal power generation status;

[0023] Figure 5 It is a three-dimensional axonometric view of the braking state;

[0024] Figure 6 This is the schematic diagram of the hydraulic operating mechanism of this invention.

[0025] The serial numbers marked in the figure are respectively as follows: 1. power generation main shaft; 2. power generation wheel disc; 3. power generation bucket; 4. power generation nozzle; 5. power generation water spray pipe; 6. brake shaft; 6-1. fixed shaft; 6-2 telescopic shaft; 7. brake wheel disc; 8. brake bucket; 9. brake nozzle; 10. brake water inlet pipe; 11. annular water distribution pipe; 12. brake water inlet valve; 13. hydraulic operating mechanism; 13-1. electric motor; 13-2. oil pump; 13-3. oil filter; 13-4. flow regulating valve; 13-5. electromagnetic reversing valve; 13-6. overflow valve; 13-7. return oil tank. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] See attached Figure 1-6 A novel impulse turbine braking device comprises a generator main shaft 1, a generator wheel disc 2, an electric water spray device and a turbine braking device. The center of the generator wheel disc 2 is connected to the generator main shaft 1, and a plurality of generator water buckets 3 are arranged around the generator main shaft 1. An annular water distribution pipe 11 is arranged on the outer side of the generator water bucket. A plurality of generator water spray devices are arranged on the inner side of the annular water distribution pipe. The generator water spray device comprises a generator water spray pipe 5 and a generator nozzle 4 arranged at the front end of the generator water spray pipe 5.

[0028] The water turbine braking device includes a brake shaft 6, a brake wheel disc 7, and a brake water bucket 8. One end of the brake shaft 6 is connected to the power generation wheel disc 2, and the other end is connected to the brake wheel disc 7. The connection method is flange bolt connection. A plurality of brake water buckets 8 are arranged around the brake wheel disc 7. A water pipe is arranged on one side of the end of the annular water distribution pipe 11, and two brake nozzles are arranged at the end of the water pipe.

[0029] The brake nozzle comprises a brake water inlet pipe 10 and a brake nozzle 9 arranged at the end of the brake water inlet pipe 10 .

[0030] A water valve 12 is provided between the end of the annular water distribution pipe 11 and a water pipe on one side of the end.

[0031] The brake wheel is a brake device used to quickly reduce the inertia speed of the turbine when the turbine is shut down normally or suddenly shut down due to load shedding. The diameter of the brake wheel disc 7 is smaller than that of the generator wheel disc 2. Four brake water buckets 8 can be set on the circumference of the brake wheel disc 7. The brake water buckets and the brake wheel disc can be fixed by welding, and

[0032] The water-facing working surface of the brake bucket 8 faces the opposite direction to the water-facing working surface of the power generation bucket 3. For example, the power generation bucket is arranged in a clockwise direction around the circumference of the power generation wheel disc, and the brake bucket is arranged in a counterclockwise direction around the brake wheel disc.

[0033] The brake shaft 6 is provided with a hydraulic operating mechanism or an electric mechanism. Figure 6 The hydraulic operating mechanism 13 is shown to enable the brake shaft 6 together with the brake rotor disc 7 and the brake water bucket 8 to perform telescopic movement along the axial direction.

[0034] The side where the power generating rotor disc 2 is connected to the brake shaft 6 is a concave cavity. When the brake shaft 6 is retracted to the shortest length, the brake rotor disc 7 and the brake water bucket 8 are arranged in the concave cavity.

[0035] The extension or retraction of the brake shaft 6 is automatically controlled by a displacement sensor matched with the hydraulic operating mechanism 13. When the brake shaft 6, the brake rotor disc 7 and the brake water bucket 8 extend out of the concave cavity of the power generation rotor disc 2 under the action of the hydraulic operating mechanism 13, until the position of the brake water bucket 8 is consistent with the position of the two brake nozzles, the brake nozzle 9 starts to spray, and the spraying direction corresponds to the water-facing working surface of the brake water bucket 8.

[0036] The brake shaft 6 includes a fixed shaft 6-1 and a telescopic shaft 6-2 with one end arranged inside the fixed shaft 6-1. A cavity for storing hydraulic oil is provided inside the fixed shaft, and the telescopic shaft is similar to a piston rod structure. The brake shaft 6 is connected to an external hydraulic operating mechanism 13 through oil inlet and outlet pipelines.

[0037] The hydraulic operating mechanism mainly includes an electric motor 13-1, a pressure oil pump 13-2, an oil filter 13-3, a flow regulating valve 13-4, an electromagnetic reversing valve 13-5, an oil overflow valve 13-6 and an oil return tank 13-7. When the braking device needs to be engaged / exited, the hydraulic operating mechanism 13 is started and the electromagnetic reversing valve 13-5 changes the direction of the oil circuit to control the brake shaft 6 to extend or retract.

[0038] The brake water inlet valve 12 is a hydraulic needle valve. Its opening and closing is controlled by a displacement sensor matched with the hydraulic operating mechanism 13. That is, when the unit needs to brake, the hydraulic operating mechanism 13 controls the brake shaft 6 to extend and drive the brake wheel to enter the braking position. At this time, the displacement sensor simultaneously controls the brake water inlet valve 12 to open, so that the water flows through the brake nozzle 9 to impact the brake water bucket 8, thereby braking the unit.

[0039] The device adds a set of brake turbines with smaller size and opposite rotation direction to the normal power generation turbine. When the power generation turbine is generating electricity, the brake turbine is hidden in the recessed cavity of the power generation wheel disc so as not to affect the working efficiency of the power generation turbine. When the power generation turbine needs to be braked, the brake turbine extends out of the power generation wheel disc into the braking position under the action of the hydraulic operating mechanism (or electric mechanism), and at the same time opens the brake water inlet valve on the brake nozzle, so that the water flows through the brake nozzle to impact the brake bucket to form a braking torque, so as to achieve the purpose of rapid braking of the power generation turbine.

[0040] Specifically, compared with the previous impulse turbine braking method, a new type of impulse turbine braking device invented by the present invention achieves rapid braking of the unit by increasing the braking torque. At the same time, in order to prevent the unit from reversing, a linkage mechanism between a unit speed monitoring device and a braking device is also provided. When the unit speed drops to about 15% of the rated speed, the braking device will automatically exit, which will not only not affect the normal operating efficiency of the generator set, but also greatly shorten the braking time of the impulse unit, thereby improving the operating safety and stability of the impulse unit.

[0041] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A novel impulse turbine braking device, characterized in that: The invention comprises a generator main shaft (1), a generator wheel disc (2), an electric water spray device and a turbine braking device. The generator wheel disc (2) is connected to the generator main shaft (1) at its center and is surrounded by a plurality of generator water buckets (3). An annular water distribution pipe (11) is provided on the outer side of the generator water bucket. A plurality of generator water spray devices are provided on the inner side of the annular water distribution pipe. The generator water spray device comprises a generator water spray pipe (5) and a generator nozzle (4) provided at the front end of the generator water spray pipe (5). The water turbine braking device comprises a brake shaft (6), a brake rotor disc (7) and a brake water bucket (8); one end of the brake shaft (6) is connected to the power generation rotor disc (2), and the other end is connected to the brake rotor disc (7); a plurality of brake water buckets (8) are arranged around the brake rotor disc (7); a water pipe is arranged at one side of the end of the annular water distribution pipe (11), and a brake nozzle is arranged at the end of the water pipe.

2. A novel impulse turbine braking device according to claim 1, characterized in that: The brake spray pipe comprises a brake water inlet pipe (10) and a brake nozzle (9) arranged at the end of the brake water inlet pipe (10).

3. According to claim 1, a novel impulse turbine braking device is characterized in that: A water valve (12) is provided between the end of the annular water distribution pipe (11) and a water pipe on one side of the end.

4. According to claim 1, a novel impulse turbine braking device is characterized in that: The diameter of the brake rotor disc (7) is smaller than that of the power generation rotor disc (2).

5. According to claim 1, the novel impulse turbine braking device is characterized in that: The water-facing working surface of the braking water bucket (8) faces in the opposite direction to the water-facing working surface of the power generation water bucket (3).

6. According to claim 1, the novel impulse turbine braking device is characterized in that: The brake shaft (6) is provided with a hydraulic operating mechanism or an electric mechanism, so that the brake shaft (6) together with the brake rotary disc (7) and the brake water bucket (8) can perform telescopic movement along the axial direction.

7. The novel impulse turbine braking device according to claim 1 is characterized in that: The side where the power generation rotor disc (2) is connected to the brake shaft (6) is a concave cavity, and when the brake shaft (6) is contracted to the shortest length, the brake rotor disc (7) and the brake water bucket (8) are arranged in the concave cavity.

8. The novel impulse turbine braking device according to claim 1 is characterized in that: The brake shaft (6) comprises a fixed shaft (6-1) and a telescopic shaft (6-2) with one end arranged inside the fixed shaft (6-1); a cavity for storing hydraulic oil is arranged inside the fixed shaft; and the brake shaft (6) is connected to an external hydraulic operating mechanism (13) via oil inlet and outlet pipelines.

9. The novel impulse water turbine braking device according to claim 8 is characterized in that: The hydraulic operating mechanism mainly comprises an electric motor (13-1), a pressure oil pump (13-2), an oil filter (13-3), a flow regulating valve (13-4), an electromagnetic reversing valve (13-5), an oil overflow valve (13-6) and an oil return tank (13-7). When the brake device needs to enter / exit, the hydraulic operating mechanism (13) is started, and the electromagnetic reversing valve (13-5) changes the direction of the oil circuit to control the brake shaft (6) to extend or retract.

10. The novel impulse turbine braking device according to claim 3 is characterized in that: The water valve (12) is a hydraulic needle valve.

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