CN216198599U - Sealing structure for main shaft of mixed-flow water turbine - Google Patents
Sealing structure for main shaft of mixed-flow water turbine Download PDFInfo
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- CN216198599U CN216198599U CN202121782649.5U CN202121782649U CN216198599U CN 216198599 U CN216198599 U CN 216198599U CN 202121782649 U CN202121782649 U CN 202121782649U CN 216198599 U CN216198599 U CN 216198599U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model discloses a sealing structure for a main shaft of a mixed-flow water turbine, which relates to the field of mixed-flow water turbines and comprises a sealing frame, a magnetic sleeve, a magnetic pole and a magnetic ring, wherein the sealing frame is fixedly arranged on a rack of the water turbine and is positioned between a top cover of the water turbine and a water guide bearing; the magnetic ring is wound with an electromagnetic coil, and two ends of the electromagnetic coil are connected with the positive electrode and the negative electrode of the power supply; a closed magnetic loop is formed among the magnetic ring, the magnetic pole and the magnetic sleeve; by filling magnetic fluid between the magnetic ring and the magnetic sleeve and arranging the magnetic ring between the two magnetic poles, after the electromagnetic coil on the magnetic ring is electrified, a closed magnetic loop is formed among the magnetic ring, the magnetic poles and the magnetic sleeve, the magnetic fluid is tightly adsorbed between the inner side wall of the magnetic pole and the outer side wall of the magnetic sleeve to form an O-shaped magnetic fluid sealing ring, and a gap is locked, so that the sealing effect is achieved, the contact sealing with the main shaft is realized, and the water is prevented from flowing into the water guide bearing after being leaked.
Description
Technical Field
The utility model relates to the field of mixed-flow water turbines, in particular to a sealing structure for a main shaft of a mixed-flow water turbine.
Background
The gap between the shaft and the fixed part enters the positions of the water guide bearing and the like, the quality of lubricating oil in the water guide bearing is damaged, the cooling effect is poor, the normal operation of a unit is influenced, and the main shaft seal is generated. The main shaft seal can effectively prevent water leakage from leaking between the large shaft and the fixed part and ascending, prevent the guide bearing from being influenced in operation and prevent the top cover from being flooded, and keep the normal operation of the unit.
Nowadays, water turbine designers pay attention to development of hydraulic models and improvement of unit automation degree, and development of the electrical monitoring industry drives improvement of the automation degree of a water turbine control system, so that unattended operation and unattended operation become common requirements of hydropower station construction. Therefore, the traditional water turbine main shaft sealing technology is relatively lagged, and the communication, popularization and application of the advanced technology are hindered to a certain extent. For newly-built large and medium hydropower stations, the water turbine generator set is required to be capable of carrying out central centralized control, and the starting, grid connection or stopping of the water turbine generator set can be completed by one instruction, so that new requirements are provided for the main shaft seal of the water turbine, the main shaft seal of the water turbine is required to work safely and reliably for a long time, and the main shaft seal can not be overhauled before the overhaul period; it is also desirable that the turbine main shaft seal be capable of self-compensating adjustments or no adjustments.
The traditional main shaft sealing mode of the water turbine mainly comprises packing sealing, mechanical end face sealing, water end face sealing, floating ring sealing and labyrinth sealing; in the operation process of the mixed-flow water turbine, the rotation speed of the rotating wheel is high, vibration caused by hydraulic excitation is high, and the vibration caused by poor mechanical matching of the large shaft and the guide bearing causes the large shaft to jump or the installation is not correct to bring clearance change, so that the sealing water leakage of the main shaft can be caused, the leakage water flows upwards to the water guide bearing part through the clearance between the leakage water and the large shaft to form oil-water mixture, the emulsification of lubricating oil is caused, and the cooling effect is influenced. The oil is discharged into a river through a drainage system along with the water flow, so that water pollution is caused, and the ecological environment is damaged; in addition, the sealing mode has the defects of easy damage, short maintenance period, small used unit range, unstable sealing, large leakage amount, high requirement on the machining precision of sealing parts and the like; meanwhile, the distance between the water guide bearing and the main shaft seal is very short, the water guide bearing is usually entered into the main shaft seal along the large shaft when the main shaft seal leaks water, and the water guide bearing is circulated from the low-level oil tank to the high-level oil tank, so that the water guide cooling and lubricating failure is caused, and finally the bearing burning accident is stopped.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems and designs a sealing structure for a main shaft of a mixed-flow water turbine.
The utility model realizes the purpose through the following technical scheme:
a seal structure for a francis turbine main shaft, comprising:
a sealing frame; the sealing frame is fixedly arranged on a frame of the water turbine, the sealing frame is positioned between a top cover of the water turbine and the water guide bearing, when the water turbine is started, the sealing frame and the main shaft are in a relative rotation state, and the sealing frame is made of an insulating material;
a magnetic sleeve; the magnetic sleeve is of an annular structure and fixedly sleeved on the outer side wall of the main shaft;
at least two magnetic poles; the magnetic pole is of an annular structure, the magnetic pole is fixed on the sealing frame and sleeved on the magnetic sleeve, the inner diameter of the magnetic pole is slightly larger than the outer diameter of the magnetic sleeve, and magnetic fluid is filled between the inner side wall of the magnetic pole and the outer side wall of the magnetic sleeve;
at least one magnetic ring; a magnetic ring is positioned between two adjacent magnetic poles, two ends of the magnetic ring are respectively and fixedly connected with the opposite side surfaces of the two magnetic poles, an electromagnetic coil is wound on each magnetic ring, and two ends of the electromagnetic coil are respectively connected with the positive electrode and the negative electrode of a power supply; a closed magnetic loop is formed among the magnetic ring, the magnetic pole and the magnetic sleeve.
The utility model has the beneficial effects that: by filling magnetic fluid between the magnetic ring and the magnetic sleeve and arranging the magnetic ring between the two magnetic poles, after the electromagnetic coil on the magnetic ring is electrified, a closed magnetic loop is formed among the magnetic ring, the magnetic poles and the magnetic sleeve, the magnetic fluid is tightly adsorbed between the inner side wall of the magnetic pole and the outer side wall of the magnetic sleeve to form an O-shaped magnetic fluid sealing ring, and a gap is locked, so that the sealing effect is achieved, the contact sealing with the main shaft is realized, and the water is prevented from flowing into the water guide bearing after being leaked.
Drawings
FIG. 1 is a schematic structural diagram of a sealing structure for a main shaft of a francis turbine according to the present invention;
fig. 2 is a sectional structure schematic view of a sealing frame in the sealing structure for the francis turbine main shaft of the present invention;
FIG. 3 is a schematic cross-sectional structure of a magnetic pole in the sealing structure for the main shaft of the francis turbine according to the present invention;
wherein corresponding reference numerals are:
1-sealing frame, 2-magnetofluid, 3-magnetic sleeve, 4-magnetic ring, 5-electromagnetic coil, 6-magnetic pole, 7-exhaust hole, 8-main shaft, 9-top cover, 10-volute, 11-rotating wheel, 12-guide vane and 13-frame.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the utility model refers to the accompanying drawings.
As shown in fig. 1 and 2, the sealing structure for the francis turbine main shaft 8 includes:
a sealing frame 1; the sealing frame 1 is fixedly arranged on a frame of the water turbine, the sealing frame 1 is positioned between a top cover 9 and a water guide bearing of the water turbine, when the water turbine is started, the sealing frame 1 and the main shaft 8 are in a relative rotation state, and the sealing frame 1 is made of an insulating material;
a magnetic sleeve 3; the magnetic sleeve 3 is of an annular structure, and the magnetic sleeve 3 is fixedly sleeved on the outer side wall of the main shaft 8;
at least two magnetic poles 6; the magnetic pole 6 is of an annular structure, the magnetic pole 6 is fixed on the sealing frame 1, the magnetic pole 6 is sleeved on the magnetic sleeve 3, the inner diameter of the magnetic pole 6 is slightly larger than the outer diameter of the magnetic sleeve 3, and magnetic fluid 2 is filled between the inner side wall of the magnetic pole 6 and the outer side wall of the magnetic sleeve 3;
at least one magnetic ring 4; one magnetic ring 4 is positioned between two adjacent magnetic poles 6, two ends of the magnetic ring 4 are respectively and fixedly connected with the opposite side surfaces of the two magnetic poles 6, an electromagnetic coil 5 is wound on each magnetic ring 4, and two ends of the electromagnetic coil 5 are respectively connected with the positive electrode and the negative electrode of a power supply; a closed magnetic loop is formed among the magnetic ring 4, the magnetic pole 6 and the magnetic sleeve 3.
As shown in fig. 3, the inner side wall of the magnetic pole 6 is provided with at least one concave ring groove, the inner side wall of the magnetic pole 6 is provided with a groove, the contact area between the magnetic fluid 2 and the inner side wall of the magnetic pole 6 is increased, and the arrangement of the plurality of ring grooves can form a plurality of layers of magnetic fluid O-shaped sealing rings in use, so that the sealing effect is enhanced.
As shown in fig. 3, the cross section of the ring groove is a V-shaped structure, the maximum width b of the ring groove is 0.9mm, and the included angle α between the two side surfaces of the ring groove is 45 °.
As shown in fig. 3, the depth h of the ring groove is 1.3mm, and the gap l between the inner side wall of the magnetic pole 6 and the outer side wall of the magnetic sleeve 3 is 1.2 mm.
The magnetic fluid 2 comprises nano Fe3O4 magnetic particles, a surfactant and an oil base; the magnetic particles of the nano Fe3O4 account for 4 to 10 percent of the total volume of the magnetic fluid 2, the surfactant accounts for 1 to 5 percent of the total volume of the magnetic fluid 2, and the oil base accounts for 85 to 95 percent of the total volume of the magnetic fluid 2
The sealing frame 1 is provided with an exhaust hole 7, and the exhaust hole 7 is used for exhausting gas between the sealing frame 1 and the main shaft 8.
By filling the magnetic fluid 2 between the magnetic ring 4 and the magnetic sleeve 3 and arranging the magnetic ring 4 between the two magnetic poles 6, after the electromagnetic coil 5 on the magnetic ring 4 is electrified, a closed magnetic loop is formed among the magnetic ring 4, the magnetic poles 6 and the magnetic sleeve 3, the magnetic fluid 2 is tightly adsorbed between the inner side wall of the magnetic pole 6 and the outer side wall of the magnetic sleeve 3 to form a magnetic fluid O-shaped sealing ring, and a gap is locked, so that the sealing effect is achieved, the contact sealing with the main shaft 8 is realized, and the water is prevented from flowing into the water guide bearing after being leaked.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (6)
1. A seal structure for francis turbine main shaft, characterized by comprising:
a sealing frame; the sealing frame is fixedly arranged on a frame of the water turbine, the sealing frame is positioned between a top cover of the water turbine and the water guide bearing, when the water turbine is started, the sealing frame and the main shaft are in a relative rotation state, and the sealing frame is made of an insulating material;
a magnetic sleeve; the magnetic sleeve is of an annular structure and fixedly sleeved on the outer side wall of the main shaft;
at least two magnetic poles; the magnetic pole is of an annular structure, the magnetic pole is fixed on the sealing frame and sleeved on the magnetic sleeve, the inner diameter of the magnetic pole is slightly larger than the outer diameter of the magnetic sleeve, and magnetic fluid is filled between the inner side wall of the magnetic pole and the outer side wall of the magnetic sleeve;
at least one magnetic ring; a magnetic ring is positioned between two adjacent magnetic poles, two ends of the magnetic ring are respectively and fixedly connected with the opposite side surfaces of the two magnetic poles, an electromagnetic coil is wound on each magnetic ring, and two ends of the electromagnetic coil are respectively connected with the positive electrode and the negative electrode of a power supply; a closed magnetic loop is formed among the magnetic ring, the magnetic pole and the magnetic sleeve.
2. A sealing structure for a francis turbine main shaft according to claim 1, wherein the inner side wall of the magnetic pole is provided with at least one concave ring groove.
3. The seal structure for the francis turbine main shaft according to claim 2, wherein the ring groove has a V-shaped cross section.
4. A seal structure for a francis turbine main shaft according to claim 2, wherein the depth of the ring groove is in the range of 1.2mm to 1.45mm, and the gap between the inner side wall of the magnetic pole and the outer side wall of the magnetic sleeve is in the range of 0.08 mm to 0.18 mm.
5. A seal structure for a francis turbine main shaft according to claim 3, wherein the maximum width of the ring groove is in the range of 0.9 to 0.95mm, and an angle between both side surfaces of the ring groove is 45 °.
6. A sealing structure for a francis turbine main shaft according to claim 1, wherein the sealing frame is provided with a gas discharge hole for discharging gas between the sealing frame and the main shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121782649.5U CN216198599U (en) | 2021-08-02 | 2021-08-02 | Sealing structure for main shaft of mixed-flow water turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121782649.5U CN216198599U (en) | 2021-08-02 | 2021-08-02 | Sealing structure for main shaft of mixed-flow water turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216198599U true CN216198599U (en) | 2022-04-05 |
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ID=80895957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121782649.5U Active CN216198599U (en) | 2021-08-02 | 2021-08-02 | Sealing structure for main shaft of mixed-flow water turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216198599U (en) |
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2021
- 2021-08-02 CN CN202121782649.5U patent/CN216198599U/en active Active
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