Two-way fluctuation backflow sealing structure of pumped storage unit

Abstract

This invention provides a bidirectional fluctuating backflow sealing structure for a pumped-storage hydroelectric unit. The structure is arranged in the lubricating oil trough of a rotating shaft. A fixed sealing cylinder is located on the outer periphery of the shaft. Inside the sealing cylinder are two backflow sealing units, one at a higher elevation and the other at a lower elevation. Each backflow sealing unit includes a motor, a power roller, a rotating base, an airflow cover, and a high-pressure air supply pipe. The rotating base is arranged around the shaft and can rotate freely. Its side against the shaft has oblique toothed blades, which generate a downward blowing airflow along the outer side of the shaft through rotation. Furthermore, the rotating bases of the two backflow sealing units rotate in opposite directions. In this way, regardless of whether the shaft is rotating clockwise or counterclockwise, one of the backflow sealing units can be activated, ensuring that the rotating base of that backflow sealing unit rotates in the opposite direction to the shaft, thus guaranteeing the formation of a uniform high-pressure air curtain and preventing oil mist leakage.

Description

Technical Field

[0001] This invention relates to a bidirectional fluctuation backflow sealing structure for pumped storage units. Background Technology

[0002] During operation, the bearings of generator units in pumped storage hydropower stations generate a large amount of bearing lubricating oil mist due to the rising temperature. This mist can contaminate the generator equipment, leaving a lot of oil residue in the entire pit or inside the stator and rotor, causing generator malfunctions and environmental pollution.

[0003] Because pumped storage units need to frequently rotate forward and reverse during operation, traditional seals are unable to solve the problem of oil mist overflow, resulting in high maintenance costs, inconvenience in maintenance, and high energy consumption. Moreover, oil leakage, oil spillage, and oil mist can seriously threaten the safe operation of the generator. Summary of the Invention

[0004] This invention provides a bidirectional fluctuating backflow sealing structure for pumped storage units, the purpose of which is to solve the technical problem that traditional seals in the prior art cannot solve the problem of oil mist overflow.

[0005] The technical solution adopted in this invention is as follows:

[0006] A bidirectional ripple backflow sealing structure for a pumped-storage hydroelectric unit is arranged in the lubricating oil groove of a rotating shaft. Its characteristic feature is that a fixed-position sealing cylinder is provided on the outer circumference of the rotating shaft, forming an annular gap. Inside the sealing cylinder are two backflow sealing units, one at a high position and the other at a low position.

[0007] Each backflow sealing unit includes a motor, a drive roller, a rotating base, an airflow cover, and a high-pressure air supply pipe. The rotating base is arranged around the rotating shaft and can rotate freely. The side of the rotating base that is in contact with the rotating shaft is provided with oblique toothed blades. The drive roller meshes with the rotating base, and the motor is connected to the drive roller. The drive roller drives the rotating base to rotate. The oblique toothed blades on the rotating base generate a downward blowing airflow along the outside of the rotating shaft due to the rotation. An airflow space is formed above the rotating base. One end of the airflow space is connected to the high-pressure air supply pipe, and the other end is connected to the top of the oblique toothed blades.

[0008] The rotating bases of the two backflow sealing units rotate in opposite directions.

[0009] The pumped storage unit's bidirectional ripple backflow sealing structure includes an airflow cover plate covering the rotating base to form a triangular cross-section airflow space. The wider end of the airflow space is connected to the high-pressure air delivery pipe, and the narrower end is connected to the top of the oblique toothed blade.

[0010] The pumped storage unit has a bidirectional fluctuation backflow sealing structure, wherein: a one-way valve is provided on the high-pressure air supply pipe to prevent the airflow in the high-pressure air supply pipe from flowing to the outside of the sealing cylinder.

[0011] The pumped storage unit has a bidirectional undulating backflow sealing structure, wherein the oblique toothed blades on the rotating bases of the two backflow sealing units have opposite orientations, so that the blowing airflow generated by the rotating bases of the two backflow sealing units is downward.

[0012] The pumped storage unit bidirectional fluctuation backflow sealing structure includes an oil tank sealed with a sealing cover, and a sealing cylinder fixed on the sealing cover.

[0013] The aforementioned bidirectional ripple backflow sealing structure for pumped storage units includes a sealing structure in which the upper and lower parts of the sealing cylinder are respectively connected to the rotating shaft to form a sealed connection, thereby creating a relatively closed space inside the sealing cylinder.

[0014] The aforementioned bidirectional ripple backflow sealing structure for pumped storage units includes sealing teeth and positioning baffles.

[0015] The pumped storage unit has a bidirectional ripple backflow sealing structure, wherein the motors of the two backflow sealing units are electrically connected to an intelligent control unit.

[0016] The pumped storage unit's bidirectional ripple backflow sealing structure includes a temperature sensor and a pressure sensor installed in each airflow space, and the temperature sensor and pressure sensor are electrically connected to the intelligent control unit.

[0017] The pumped storage unit has a bidirectional oscillating backflow sealing structure, wherein: multiple high-pressure air supply pipes are evenly arranged circumferentially, and multiple triangular baffles are evenly arranged circumferentially in the annular airflow space.

[0018] The advantage of this invention is that, regardless of whether the pumped storage unit is in pumping or storage mode, that is, regardless of whether the rotating shaft is rotating forward or backward, one of the backflow sealing units can be activated, so that the rotation direction of the rotating base of the backflow sealing unit is opposite to the rotation direction of the rotating shaft, so as to avoid the air leakage problem caused by the two rotating in the same direction (relatively not rotating), ensuring the formation of a uniform high-pressure air curtain and blocking the oil mist from overflowing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the bidirectional fluctuation backflow sealing structure of the pumped storage unit provided by the present invention.

[0020] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0021] Figure 3This is a schematic diagram of the circumferential structure of the backflow sealing unit.

[0022] Explanation of reference numerals in the attached drawings: 1. Rotating shaft; 2. Oil tank; 3. Sealing cover; 4. Sealing cylinder; 5. Sealing structure; 6. Backflow sealing unit; 61. Motor; 62. Power roller; 63. Rotating base; 64. Airflow cover plate; 65. High-pressure air supply pipe; 66. One-way valve; 67. Triangular partition; 7. Intelligent control unit. Detailed Implementation

[0023] like Figure 1 , Figure 2 As shown, the present invention provides a bidirectional fluctuation backflow sealing structure for a pumped storage unit, which is arranged in a lubricating oil trough 2 of a rotating shaft 1, and the trough 2 is sealed with a sealing cover 3, wherein:

[0024] A sealing cylinder 4 is provided on the outer periphery of the rotating shaft 1. The sealing cylinder 4 is fixed on the sealing cover 3 and forms an annular gap with the rotating shaft 1. The upper and lower parts of the sealing cylinder 4 are respectively sealed to the rotating shaft 1 by sealing structures 5 (such as sealing teeth, positioning baffles, etc.), so that a relatively sealed space is formed inside the sealing cylinder 4. If not blocked, during operation, the oil mist in the oil tank 2 will climb upward along the axial direction of the rotating shaft 1 (such as...). Figure 1 (As shown by the solid arrow in the middle), it passes over the sealing structure 5 and then is thrown outward;

[0025] Therefore, the present invention provides a backflow sealing unit 6 with two locations, one high and one low, inside the sealing cylinder 4, wherein:

[0026] Each backflow sealing unit 6 includes a motor 61, a power roller 62, a rotating base 63, an airflow cover 64, a high-pressure air supply pipe 65, and a one-way valve 66. The rotating base 63 is arranged around the rotating shaft 1 and can rotate freely. Its side against the rotating shaft 1 is provided with helical toothed blades 631. The power roller 62 is located below the rotating base 63 and meshes with it. The motor 61 is connected to the power roller 62, and the power roller 62 drives the rotating base 63 to rotate. The oblique toothed blades 631 on the rotating base 63 generate a downward blowing airflow along the outside of the rotating shaft 1 by rotating. The rotating base 63 is covered by an airflow cover plate 64 (the airflow cover plate 64 rotates synchronously with the rotating base 63) to form an airflow space with a triangular cross section. The wider end of the airflow space is connected to the high-pressure air delivery pipe 65, and the narrower end is connected to the top of the oblique toothed blades 631. The one-way valve 66 is provided on the high-pressure air delivery pipe 65 to prevent the airflow in the high-pressure air delivery pipe 65 from flowing to the outside of the sealing cylinder 4.

[0027] like Figure 3As shown, multiple high-pressure air supply pipes 65 can be evenly arranged in the circumference to form a uniform air supply in the circumference; multiple triangular baffles 67 can be evenly arranged in the circumference in the annular airflow space to avoid turbulence in the airflow space in the circumference.

[0028] The rotating bases 63 of the two backflow sealing units 6 rotate in opposite directions, but through different orientations of the helical teeth, the blowing airflow generated by the rotating bases 63 of the two backflow sealing units 6 is downward.

[0029] The motors 61 of the two backflow sealing units 6 are electrically connected to an intelligent control unit 7. The intelligent control unit 7 starts the correct backflow sealing unit 6 (including the corresponding high-pressure air supply pipe 65) and switches it into working state according to the rotation direction of the shaft 1.

[0030] In addition, temperature sensors and pressure sensors (not shown) are installed in each airflow space. The temperature sensors and pressure sensors are also electrically connected to the intelligent control unit 7 to intelligently adjust the rotation speed of the rotating base 63.

[0031] In this way, regardless of whether the pumped storage unit is in pumping or storage mode, that is, regardless of whether the rotating shaft 1 is rotating forward or backward, one of the backflow sealing units 6 can be activated, so that the rotation direction of the rotating base 63 of the backflow sealing unit 6 is opposite to the rotation direction of the rotating shaft 1, so as to avoid the air leakage problem caused by the two rotating in the same direction (not rotating relative to each other), ensuring the formation of a uniform high-pressure air curtain and blocking the oil mist from overflowing.

Claims

1. A bidirectional ripple backflow sealing structure for a pumped-storage hydroelectric unit, arranged in a lubricating oil trough of a rotating shaft, characterized in that, A fixed-position sealing cylinder is provided on the outer circumference of the rotating shaft, forming an annular gap. Inside the sealing cylinder are two backflow sealing units, one high and one low, wherein: Each backflow sealing unit includes a motor, a drive roller, a rotating base, an airflow cover, and a high-pressure air supply pipe. The rotating base is arranged around the rotating shaft and can rotate freely. The side of the rotating base that is in contact with the rotating shaft is provided with oblique toothed blades. The drive roller meshes with the rotating base, and the motor is connected to the drive roller. The drive roller drives the rotating base to rotate. The oblique toothed blades on the rotating base generate a downward blowing airflow along the outside of the rotating shaft due to the rotation. An airflow space is formed above the rotating base. One end of the airflow space is connected to the high-pressure air supply pipe, and the other end is connected to the top of the oblique toothed blades. The rotating bases of the two backflow sealing units rotate in opposite directions.

2. The bidirectional fluctuation backflow sealing structure for pumped storage units according to claim 1, characterized in that: The rotating base is covered by an airflow cover to form an airflow space with a triangular cross-section. The wider end of the airflow space is connected to the high-pressure air delivery pipe, and the narrower end is connected to the top of the oblique toothed blade.

3. The bidirectional fluctuation backflow sealing structure for pumped storage units according to claim 1, characterized in that: The high-pressure gas delivery pipe is equipped with a one-way valve to prevent the gas flow inside the high-pressure gas delivery pipe from flowing to the outside of the sealing cylinder.

4. The bidirectional fluctuation backflow sealing structure for pumped storage units according to claim 1, characterized in that: The oblique toothed blades on the rotating bases of the two backflow sealing units have opposite orientations, so that the blowing airflow generated by the rotating bases of the two backflow sealing units is downward.

5. The bidirectional fluctuation backflow sealing structure for pumped storage units according to claim 1, characterized in that: The oil tank is sealed with a sealing cap, and the sealing cylinder is fixed on the sealing cap.

6. The bidirectional fluctuation backflow sealing structure for pumped storage units according to claim 1, characterized in that: The upper and lower parts of the sealing cylinder are connected to the rotating shaft by sealing structures, forming a relatively closed space inside the sealing cylinder.

7. The bidirectional fluctuation backflow sealing structure for pumped storage units according to claim 6, characterized in that: The sealing structure includes sealing teeth and positioning baffles.

8. The bidirectional fluctuation backflow sealing structure for pumped storage units according to claim 1, characterized in that: The motors of the two backflow sealing units are electrically connected to an intelligent control unit.

9. The bidirectional fluctuation backflow sealing structure for pumped storage units according to claim 8, characterized in that: Temperature sensors and pressure sensors are also installed in each airflow space, and the temperature sensors and pressure sensors are electrically connected to the intelligent control unit.

10. The bidirectional fluctuation backflow sealing structure for pumped storage units according to claim 1, characterized in that: Multiple high-pressure air delivery pipes are evenly arranged circumferentially, and multiple triangular baffles are evenly arranged circumferentially in the annular airflow space.

Images