Anti-blocking device for cooling water pipeline of hydraulic generator

Abstract

The utility model discloses an anti-blocking device for a cooling water pipeline of a hydro-generator, which is characterized by comprising an annular pipe neck (4), the front part of the pipe neck is fixedly connected with a primary filter screen (2), the rear part of the pipe neck is fixedly connected with a pipe body (6), the inner wall of the pipe neck is provided with a shaft rod (3) at the center through a support frame (5), and the front end of the shaft rod penetrates through the center of the primary filter screen and extends outwards; a first fan blade (1) is fixed to the front extending end, the rear end of the shaft rod extends towards the pipe body, a second fan blade (12) is fixed to the rear extending end, a water outlet channel is reserved in the rear end of the pipe body, a connecting pipe (9) is arranged in the center of the rear end of the pipe body, and a secondary filter screen (7) is fixed to the front end of the connecting pipe. Through the first-stage filter screen, the second-stage filter screen and the action of centrifugal force, a pure water source can be collected in a unit flow channel, the unit operation period is prolonged, the labor intensity of workers is reduced, electric power generation is increased, and labor force is saved.

Description

Technical Field

[0001] This invention relates to a filtration device for hydropower stations, specifically a device for preventing blockage in the cooling water pipeline of a hydro-generator. Background Technology

[0002] Axial-flow turbine generators, with their advantages of high hydraulic efficiency, large current energy, and stable operation, have become one of the most commonly used power generation devices in my country's hydropower stations. A common cooling method for axial-flow turbine generator units is primary circulating water cooling, where water is directly drawn from the unit's flow channels for cooling. Through heat exchange, the temperature of the generator stator coils is kept below 90℃. While this method offers good cooling performance, it has drawbacks. Although screens intercept larger debris, impurities still remain in the water. These impurities enter the unit, accelerating blockages and affecting cooling efficiency. This necessitates frequent unblocking by staff, increasing workload and impacting unit efficiency, especially after summer floods. Therefore, further modifications to the cooling water system structure are urgently needed. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a device for preventing blockages in the cooling water pipeline of a hydro-generator. This device can filter out a large number of impurities in the water without relying on additional power, reducing the impurity content of the cooling water entering the unit, thereby preventing blockages, enabling the unit to operate for a longer period of time, generate more electricity, and also reducing maintenance frequency and workload. The specific solution is as follows.

[0004] A device for preventing blockage in the cooling water pipeline of a hydro-generator is characterized by comprising an annular pipe neck, a primary filter screen (pipe cap) fixed to the front of the pipe neck, a pipe body fixed to the rear of the pipe neck, a shaft mounted at the center of the inner wall of the pipe neck via a support frame, the front end of the shaft passing through the center of the primary filter screen and extending outward, with a first fan blade fixed at the front extension end, the rear end of the shaft extending towards the pipe body, with a second fan blade fixed at the rear extension end, a water outlet channel at the rear end of the pipe body, a connecting pipe (cooling water inlet pipe) at the center of the rear end of the pipe body, and a secondary filter screen fixed at the front end of the connecting pipe.

[0005] The primary and secondary filters are hemispherical filters, with the spherical surface bulging outwards towards the front (in the direction of the water flow).

[0006] The density of the primary filter is lower than that of the secondary filter. A lower filter density results in larger mesh sizes; therefore, the mesh size of the primary filter is larger than that of the secondary filter.

[0007] The outer side of the pipe neck is provided with a fixing seat, which is a flange.

[0008] The inner wall of the tube is provided with spiral blades.

[0009] The aforementioned water outlet channel at the rear end of the pipe body specifically refers to the presence of several tangential water outlets spaced around the rear end of the pipe body.

[0010] The pipe body has a water outlet channel at the rear end. Alternatively, the rear end of the pipe body can be left unsealed, and a connecting pipe can be fixed in the center by a support frame. The water outlet channel is between the connecting pipe and the inner wall of the pipe body.

[0011] The diameter of the connecting pipe is one-third of the diameter of the pipe body.

[0012] A brush can be installed behind the first blade.

[0013] Compared with existing technologies, the technical effects of this technical solution are...

[0014] 1. Through the action of primary and secondary filters and centrifugal force, relatively pure water can be collected in the unit's flow channel, extending the unit's operating cycle and reducing the labor intensity of workers, thereby increasing power generation and saving labor.

[0015] 2. This device requires no additional power; it achieves the filtration effect solely through the natural force generated by the impact of water flow, thus realizing energy-saving and environmentally friendly technical benefits. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural schematic diagram of Embodiment 1 of this utility model;

[0017] Figure 2 This is a disassembled structural diagram of Embodiment 1 of this utility model;

[0018] Figure 3 This is a three-dimensional structural schematic diagram of Embodiment 1 of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 1 First blade, 2 Primary filter screen, 3 Shaft, 4 Neck, 5 Support frame, 6 Pipe body, 7 Secondary filter screen, 8 Spiral blade, 9 Connecting pipe, 10 Tangential outlet, 11 Fixed base, 12 Second blade. Detailed Implementation

[0020] Example 1, see appendix Figure 1-3 A device for preventing blockage in the cooling water pipeline of a hydro-generator is characterized by comprising an annular neck 4, a primary filter screen 2 (pipe cap) fixed to the front of the neck, a pipe body 6 fixed to the rear of the neck, a shaft 3 installed at the center of the inner wall of the neck via a support frame 5, the front end of the shaft passing through the center of the primary filter screen and extending outward, and a first fan blade 1 fixed at the front extension end, the rear end of the shaft extending towards the pipe body, and a second fan blade 12 fixed at the rear extension end, a water outlet channel left at the rear end of the pipe body, a connecting pipe 9 (cooling water inlet pipe) provided at the center of the rear end of the pipe body, and a secondary filter screen 7 fixed at the front end of the connecting pipe.

[0021] The primary and secondary filters are hemispherical filters, with the spherical surface bulging outwards towards the front (in the direction of the water flow).

[0022] The density of the primary filter is less than that of the secondary filter.

[0023] A fixing seat 11 is provided on the outer side of the pipe neck, and the fixing seat is a flange.

[0024] The inner wall of the tube is provided with spiral blades 8.

[0025] The water outlet channel at the rear end of the pipe body specifically refers to the presence of several tangential water outlets 10 spaced around the rear end of the pipe body.

[0026] The pipe body has a water outlet channel at the rear end. Alternatively, the rear end of the pipe body can be left unsealed, and a connecting pipe can be fixed in the center by a support frame. The water outlet channel is between the connecting pipe and the inner wall of the pipe body.

[0027] The diameter of the connecting pipe is one-third of the diameter of the pipe body.

[0028] A brush can be installed behind the first blade.

[0029] In this application, "front" refers to the direction from which the water comes, and "back" refers to the direction from which the water goes, i.e., the attached... Figure 1 , 2 The upper middle part is the front, and the lower part is the back. (Attached) Figure 3 Left in the middle represents the front, and right in the middle represents the back. The use of front and back directional terms is solely for ease of understanding of this technical solution.

[0030] The principle behind this embodiment is:

[0031] Fix this device in the unit's flow channel, parallel to the water flow, and point one end of the primary filter screen in the direction of the incoming water. Then connect the cooling water inlet to the connecting pipe 9.

[0032] When the incoming water reaches the primary filter, larger particles are blocked and cannot enter the pipe body, which is the primary filtration stage. Water containing finer impurities passes through the primary filter and enters the pipe body. When the water flow impacts the first and second fan blades, it causes the blades to rotate. The rotation of the blades also has a reaction effect on the water flow, causing the water to spiral forward in the pipe and generate centrifugal force. At this time, larger impurities in the pipe are affected by centrifugal force and distributed around the perimeter, flowing away with the water flow through the outlet channel (tangential outlet hole). The relatively pure water in the center of the pipe passes through the secondary filter and enters the connecting pipe, entering the motor's water cooling system. The secondary filter, along with the fan blades and spiral blades, constitutes the secondary filtration system.

[0033] Further explanation of this technical solution:

[0034] 1. This equipment is part of a multi-stage filtration system and is installed in the turbine's flow channel. Multiple layers of debris screens are installed before the hydropower station turbine to intercept and clean larger debris such as twigs and garbage, allowing only smaller impurities to enter the flow channel. This device further filters the water flow in the flow channel to meet the requirements for cooling water. The terms "larger" and "smaller" used in this application are relative concepts at the current stage. This device cannot completely remove impurities from the water, but it can effectively extract relatively pure water from the turbine's flow channel. The fewer impurities in the cooling water, the less clogging will occur, resulting in longer turbine operating cycles and less frequent cleaning by workers, thus achieving the invention's objective.

[0035] 2. This device is installed in the unit's flow channel to collect cooling water. The primary filter removes larger impurities, and the swirling flow generated by the fan blades and spiral vanes forces larger impurities entering the pipe to be discharged through the outlet channel under centrifugal force. The secondary filter further prevents larger impurities from entering the cooling system. Therefore, with a multi-stage filtration system, the cooling water entering the connecting pipe will be relatively much purer.

[0036] 3. The first fan blade provides additional power to the second fan blade, enhancing the rotational force and centrifugal force of the spiral. In addition, a few brushes can be fixed behind the first fan blade to assist in cleaning debris adhering to the primary filter screen. Whether the debris is removed from the primary filter screen or discharged from the water outlet channel, it will naturally flow away with the water in the unit's flow path. This device only draws water from the unit's flow path, rather than filtering the water in the entire flow path.

[0037] 4. This device is easy to disassemble, and the size and shape of the fan blades and the density of the filter can be replaced as needed.

[0038] Compared with existing technologies, the technical effects of this technical solution are...

[0039] Through the action of primary and secondary filters and centrifugal force, relatively pure water can be collected in the unit's flow channel, extending the unit's operating cycle and reducing the labor intensity of workers, thereby increasing power generation and saving labor.

[0040] This device requires no additional power; it achieves its filtering effect solely through the natural force generated by the impact of water flow, thus realizing energy-saving and environmentally friendly technological benefits.

Claims

1. A device for preventing the blocking of the cooling water pipeline of a hydroelectric generator, characterized in that, The utility model discloses a filter, which comprises a ring-shaped pipe neck (4), a primary filter screen (2) fixed to the front of the pipe neck, a pipe body (6) fixed to the rear of the pipe neck, a shaft rod (3) centrally installed in the inner wall of the pipe neck through a support frame (5), the front end of the shaft rod extending outward through the center of the primary filter screen, a first fan blade (1) fixed to the front extending end of the shaft rod, the rear end of the shaft rod extending to the pipe body, a second fan blade (12) fixed to the rear extending end of the shaft rod, a water outlet channel left at the rear end of the pipe body, a connecting pipe (9) arranged at the center of the rear end of the pipe body, and a secondary filter screen (7) fixed to the front end of the connecting pipe.

2. The water-turbine-generator cooling-water-pipe clogging-prevention device according to claim 1, characterized by The primary filter screen and the secondary filter screen are hemispherical filter screens, and the spherical surfaces are outwardly convex towards the front.

3. The water-turbine-generator cooling-water-pipe clogging-prevention device according to claim 1, characterized by The density of the primary filter screen is less than that of the secondary filter screen.

4. The water-turbine-generator cooling-water-pipe clogging-prevention device according to claim 1, characterized by The outer side of the pipe neck is provided with a fixing seat (11), and the fixing seat is a flange plate.

5. The water-turbine-generator cooling-water-pipe clogging-prevention device according to claim 1, characterized by The inner wall of the pipe body is provided with a helical blade (8).

6. The hydroelectric generator cooling water line anti-clogging device of claim 1, wherein, The water outlet channel refers to a plurality of tangential water outlets (10) arranged at intervals around the rear end of the pipe body.

7. The hydroelectric generator cooling water line anti-clogging device of claim 1, wherein, The water outlet channel refers to that the rear end of the pipe body is not sealed, the connecting pipe is fixed to the center through the support frame, and the space between the connecting pipe and the inner wall of the pipe body is the water outlet channel.

8. The hydroelectric generator cooling water line anti-clogging device of claim 1, wherein, The diameter of the connecting pipe is one third of the diameter of the pipe body.

9. The hydroelectric generator cooling water line anti-clogging device of claim 1, wherein, The rear of the first fan blade is provided with a brush.

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