CN114458515A - Rim sealing device of hydroelectric generating set - Google Patents
Rim sealing device of hydroelectric generating set Download PDFInfo
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- CN114458515A CN114458515A CN202210125993.XA CN202210125993A CN114458515A CN 114458515 A CN114458515 A CN 114458515A CN 202210125993 A CN202210125993 A CN 202210125993A CN 114458515 A CN114458515 A CN 114458515A
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- magnetic fluid
- rim
- sealing
- sealing unit
- runner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
- F03B11/006—Sealing arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/57—Seals
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention discloses a rim sealing device of a water turbine generator set, which is arranged between a water turbine runner and a runner rim, wherein the runner rim is provided with a rotor connecting part; the rim sealing device comprises a magnetic fluid sealing unit and a Y-shaped sealing unit which are respectively arranged on two sides of the rotor connecting part along the axial direction of the flow channel, and the magnetic fluid sealing unit is positioned between the Y-shaped sealing unit and the rotor connecting part; the outer peripheries of the magnetic fluid sealing unit and the Y-shaped sealing unit are in sealing fit with the flow channel, and the inner periphery is in sealing fit with the rim of the rotating wheel. Zero leakage can be realized by combining the Y-shaped seal and the magnetic fluid seal, and the Y-shaped seal unit is arranged outside the magnetic fluid seal unit, so that on one hand, a large amount of water in a flow channel is prevented from entering the generator, the pressure of the water is reduced, and the reliability of the magnetic fluid seal is improved; on the other hand, particles such as silt in water flow can be prevented from entering the magnetic fluid sealing unit, and the sealing effect of the magnetic fluid is ensured.
Description
Technical Field
The invention relates to the technical field of water turbine sealing, in particular to a rim sealing device of a water turbine generator set.
Background
The sealing of the water turbine is an important component of the water turbine, and the sealing has important influence on the safe operation of the water turbine. Particularly, a generator rotor of the full through-flow turbine is directly arranged on a runner wheel rim of a rotating turbine blade, so that a seal is required to be arranged between the runner wheel and the generator rotor, and in order to ensure the normal operation of the generator and ensure that no water leakage phenomenon in any form can occur, the seal at the runner wheel rim is required to be made, so that water flow in a flow passage cannot contact the generator rotor. The related prior art adopts the sealed mode of traditional rubber to carry out the sealed of runner rim, and sealed mode is single, has withstand voltage, wearability is not good, sealed unreliable problem.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is that the sealing mode between the runner wheel rim of the water-turbine generator set and the generator is single and the sealing is unreliable in the prior art, so that the invention provides the rim sealing device of the water-turbine generator set.
In order to achieve the above object, an embodiment of the present invention provides a rim sealing device for a water turbine generator set, where the rim sealing device is disposed between a water turbine runner and a runner rim, and a rotor connecting portion adapted to be connected to a rotor of a generator is disposed on the runner rim;
the wheel rim sealing device comprises a magnetic fluid sealing unit and a Y-shaped sealing unit which are respectively arranged on two sides of the rotor connecting part along the axial direction of the flow channel, and the magnetic fluid sealing unit is positioned between the Y-shaped sealing unit and the rotor connecting part;
the magnetic fluid sealing unit and the Y-shaped sealing unit are both of annular structures, the axial direction of each annular structure is the same as that of the runner, the outer peripheral sides of the magnetic fluid sealing unit and the Y-shaped sealing unit are in sealing fit with the runner, and the inner peripheral sides of the magnetic fluid sealing unit and the Y-shaped sealing unit are in sealing fit with the rim of the rotating wheel.
Optionally, the Y-shaped sealing unit comprises a first Y-shaped sealing unit and a second Y-shaped sealing unit located at two sides of the rim of the rotating wheel;
the Y-shaped sealing unit is provided with a water-facing sealing lip and a water-backing sealing lip which are arranged at a set opening angle, and the water-facing sealing lip and the water-backing sealing lip are suitable for being in sealing contact with the rim of the rotating wheel.
Optionally, the magnetic fluid sealing unit comprises:
a permanent magnet;
the pole shoe is arranged between the runner and the rim of the rotating wheel in a sealing way, and a plurality of magnetic fluid grooves capable of containing magnetic fluid are arranged on the inner circumferential wall of the pole shoe;
the permanent magnets, the pole shoes and the magnetic fluid form a magnetic path so as to form magnetic sealing between the magnetic fluid sealing unit and the contact surface of the rim of the rotating wheel.
Optionally, a flow guide channel communicated with the magnetic fluid groove is arranged in the pole shoe;
the magnetic fluid sealing unit also comprises a magnetic fluid injection mechanism, wherein the outlet end of the magnetic fluid injection mechanism is communicated with the flow guide channel and is suitable for injecting magnetic fluid into the magnetic fluid groove.
Optionally, the magnetic fluid injection mechanism comprises:
the outlet end of the liquid injection pipe is connected with the flow guide channel;
and the sealing plug is arranged at the inlet end of the liquid injection pipe and is suitable for plugging or opening the inlet end of the liquid injection pipe.
Optionally, the flow channel is provided with an installation port for installing the magnetic fluid injection mechanism;
annotate the liquid pipe and pass through fastening nut to be fixed in the installing port, fastening nut is inside to have an interior conical surface, the entrance point of annotating the liquid pipe is the toper setting, the periphery wall of annotating the liquid pipe be formed with interior conical surface complex external cone face.
Optionally, the rim sealing device further comprises:
and the magnetic isolation unit is arranged between the magnetic fluid sealing unit and the rotor connecting part and is suitable for isolating the magnetic fluid sealing unit from the generator.
Optionally, a first mounting part for mounting a generator and a second mounting part for mounting a rim sealing device are arranged on the periphery of the water turbine runner;
the second installation parts are positioned at two sides of the first installation part, and the first installation part and the second installation part are mutually connected and are arranged in a step shape;
the magnetism isolating unit is fixed the magnetism isolating cover on the inner wall of the second installation part, the magnetism isolating cover separates a magnetism isolating space in the second installation part, and the Y-shaped sealing unit and the magnetic fluid sealing unit are both arranged in the magnetism isolating space.
Optionally, the magnetic shield comprises:
an annular peripheral side wall fixed to an inner peripheral wall of the second mounting portion;
an annular end side wall connected to a circumferential edge of the annular peripheral side wall on a side close to the first mounting portion;
the magnetic isolation space is formed between the inner wall of the magnetic isolation cover and the rim of the rotating wheel, and the side wall of the annular end is blocked between the magnetic fluid sealing unit and the mounting cavity of the first mounting part.
Optionally, the rim sealing device further comprises:
and the fixed retainer ring is arranged on one side of the magnetic shield far away from the side wall of the annular end and is suitable for clamping and fixing the Y-shaped sealing unit and the magnetic fluid sealing unit on the magnetic shield.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. according to the rim sealing device for the hydroelectric generating set, provided by the embodiment of the invention, the Y-shaped seal and the magnetic fluid seal are simultaneously arranged in the hydroelectric generating set, the seal is realized by the combination mode of the Y-shaped seal and the magnetic fluid seal, and zero leakage can be realized by the magnetic fluid seal, so that the problem of small leakage of the Y-shaped seal can be solved, the full-through-flow type hydroelectric generating set is reliably sealed, and the popularization and application of the full-through-flow type hydroelectric generating set are facilitated.
2. According to the rim sealing device of the hydroelectric generating set, provided by the embodiment of the invention, the magnetic fluid sealing unit is arranged between the Y-shaped sealing unit and the rotor connecting part, and the Y-shaped sealing unit is arranged on the outer side of the magnetic fluid sealing unit, so that on one hand, a large amount of water in a flow channel is prevented from entering an installation space of a generator, the pressure of water in front of the magnetic fluid sealing unit is reduced, and the reliability of magnetic fluid sealing is improved; on the other hand, particles such as silt in water flow are prevented from entering the magnetic fluid groove, and the sealing effect of the magnetic fluid is ensured.
3. According to the rim sealing device of the water turbine generator set, provided by the embodiment of the invention, the inlet end of the liquid injection pipe is arranged in a conical shape to form the outer conical surface matched with the inner conical surface of the fastening nut, and the liquid injection pipe is fixed on the flow channel in a conical surface matching mode, so that the stability is better, the swing of the liquid injection pipe is effectively prevented, and the rim sealing device is convenient and quick to disassemble.
4. According to the rim sealing device of the water turbine generator set, provided by the embodiment of the invention, the magnetic fluid sealing unit and the Y-shaped sealing unit are arranged along the axial direction of the flow channel, when the water thrust in the flow channel changes greatly along the axial direction, the rotor crosstalk amount is large, and the sealing effect is not influenced. When the rotor swings around the axis, the Y-shaped sealing unit can provide certain supporting force, and instability of the unit is reduced.
5. The embodiment of the invention provides a magnetism isolating cover which is inserted into a flow channel through a tooth socket and fixed, so that the magnetism isolating cover can be effectively prevented from rotating in the flow channel to influence the sealing effect of a magnetic fluid sealing unit and a Y-shaped sealing unit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for a worker of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a sectional view of the whole structure of a rim sealing device of a hydroelectric generating set according to an embodiment of the invention;
FIG. 2 is an enlarged view of the structure of FIG. 1A according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of the magnetic fluid injection mechanism in cooperation with a fastening nut in accordance with an embodiment of the present invention.
Reference numerals:
1. a flow channel; 101. a first mounting portion; 102. a second mounting portion;
2. fixing the flow guide device; 3. a movable vane arrangement; 4. a main shaft;
5. a rim sealing device; 501. a magnetic shield; 502. a retainer ring; 503. a Y-shaped sealing unit; 504. fastening a nut; 505. a plug screw; 506. a liquid injection pipe; 507. a permanent magnet; 508. a seal ring; 509. a pole shoe; 510. a magnetic fluid groove;
6. a rim of the runner; 601. a rotor connecting portion; 7. a stator support; 8. a stator; 9. a rotor; 10. a turbine blade.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a worker skilled in the art without creative efforts based on the embodiments of the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases by a worker of ordinary skill in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention aims to solve the technical problems that in the prior art, the sealing mode between the runner wheel rim of the water-turbine generator set and the generator is single, and the sealing is unreliable, so that the invention provides the rim sealing device of the water-turbine generator set.
Example 1
As shown in fig. 1 to 3, the hydroelectric generating set according to the embodiment of the present invention includes a flow channel 1, a fixed flow guiding device 2, a movable guide vane device 3, a main shaft 4, a rim sealing device 5, a runner rim 6, a generator, and turbine blades 10. The generator comprises a rotor 9, a stator 8 and a stator support 7.
The inner side of the runner 1 in this embodiment is provided with a runner lining, and the rim sealing device 5 is arranged on the runner lining. The fixed flow guide devices 2 are arranged on the two sides of the upstream and downstream of the water turbine and are used for supporting the main shaft 4. The turbine blades 10 are mounted on the main shaft 4. The generator rotor 9 is arranged on the outer edge of the water turbine blade 10 through the runner wheel rim 6. The rim sealing device 5 is arranged on the inner side of the inner lining of the runner 1 and is matched and sealed with the rim 6 of the runner. The generator stator 8 is fixed by means of a stator support 7.
The rim sealing device 5 provided by the embodiment is arranged between the water turbine runner 1 and the runner rim 6, and prevents water in the runner 1 from entering the generator. The runner rim 6 is provided with a rotor connecting part 601 suitable for being connected with a rotor 9 of a generator; the runner rim 6 comprises a rim body fixedly arranged on the periphery of the water turbine blade 10, the rim body is of an annular structure, and the axial direction of the rim body is the same as that of the runner 1. Along the axis direction of the rim body, the rotor connecting part 601 is an annular convex structure fixedly arranged at the middle position of the rim body, and the rotor 9 is fixedly arranged on the rotor connecting part 601.
Further, the rim sealing device 5 includes a magnetic fluid sealing unit and a Y-shaped sealing unit 503 respectively disposed on both sides of the rotor connecting portion 601 in the axial direction of the flow channel 1. According to the rim sealing device of the water turbine generator set provided by the embodiment of the invention, the magnetic fluid sealing unit and the Y-shaped sealing unit 503 are arranged along the axial direction of the flow channel 1, when the thrust of water in the flow channel 1 changes greatly along the axial direction, the crosstalk of the rotor 9 is large, and the sealing effect is not influenced. When the rotor 9 swings around the axis, the Y-shaped sealing unit 503 can provide a certain supporting force, reducing the instability of the unit.
Further, the magnetic fluid sealing unit is positioned between the Y-shaped sealing unit 503 and the rotor connecting part 601; the magnetic fluid sealing unit and the Y-shaped sealing unit 503 are both of annular structures, the axial direction of the annular structures is the same as that of the runner 1, the outer peripheral sides of the magnetic fluid sealing unit and the Y-shaped sealing unit 503 are in sealing fit with the runner 1, and the inner peripheral sides of the magnetic fluid sealing unit and the Y-shaped sealing unit 503 are in sealing fit with the runner rim 6.
According to the rim sealing device for the hydroelectric generating set, provided by the embodiment of the invention, the Y-shaped seal and the magnetic fluid seal are simultaneously arranged in the hydroelectric generating set, the seal is realized by the combination mode of the Y-shaped seal and the magnetic fluid seal, and zero leakage can be realized by the magnetic fluid seal, so that the problem of small leakage of the Y-shaped seal can be solved, the full-through-flow type hydroelectric generating set is reliably sealed, and the popularization and application of the full-through-flow type hydroelectric generating set are facilitated. In addition, the magnetic fluid sealing unit is arranged between the Y-shaped sealing unit 503 and the rotor connecting part 601, and the Y-shaped sealing unit 503 arranged in front of the magnetic fluid sealing unit prevents a large amount of water in the flow channel 1 from entering the installation space of the generator, reduces the pressure of the water in front of the magnetic fluid sealing unit and improves the reliability of magnetic fluid sealing; on the other hand, particles such as silt in water flow are prevented from entering the magnetic fluid sealing unit, and the sealing effect of the magnetic fluid is guaranteed.
Optionally, the Y-shaped sealing unit 503 has a water-facing sealing lip and a water-backing sealing lip arranged at a set opening angle, and the water-facing sealing lip and the water-backing sealing lip are adapted to be in sealing contact with the runner rim 6. The water-facing sealing lips are positioned at the sides of the edges close to the two ends of the rotating wheel rim 6, so that particles such as silt in a large amount of water and water flow can be effectively prevented from entering the sealing device and the generator through the gaps between the edges at the two ends of the rotating wheel rim 6 and the flow channel 1. The back water sealing lip is positioned at one side close to the magnetic fluid sealing unit, and plays a role in secondary sealing, so that the sealing effect is further improved.
Further, the Y-shaped sealing unit 503 includes a first Y-shaped sealing unit and a second Y-shaped sealing unit located at both side edges of the wheel rim 6.
The magnetic fluid sealing unit comprises a first magnetic fluid sealing unit and a second magnetic fluid sealing unit, the first magnetic fluid sealing unit is positioned between one side of the rotor connecting part 601 and the first Y-shaped sealing unit, and the second magnetic fluid sealing unit is positioned between the other side of the rotor connecting part 601 and the second Y-shaped sealing unit.
In this embodiment, the Y-shaped sealing unit 503 is a Y-shaped sealing ring, and the Y-shaped sealing ring is attached to the outer peripheral wall surface of the rim 6 of the runner by means of an opened sealing lip of the Y-shaped sealing ring. In the absence of pressure, only a small contact pressure is generated by the deformation of the lip tip. When the pressure rises, the distribution form and the size of the contact pressure are further changed, and the lip is matched with the peripheral wall surface of the runner rim 6 more tightly, so that the sealing performance and the pressure resistance are better, and the applicable pressure range is wide. And under the sealing condition, each point of the Y-shaped sealing ring, which is contacted with the sealing medium, has normal pressure equal to the pressure of the medium, so that the bottom of the sealing lip is compressed axially, the sealing lip is compressed circumferentially and is contacted with the sealing surface to be widened, meanwhile, the contact stress is increased, and the sealing performance is reliable. And after the sealing lip edge is abraded, the lip edge has certain automatic compensation capacity under the action of medium pressure.
Optionally, the magnetic fluid sealing unit comprises a permanent magnet 507 and a pole shoe 509, the pole shoe 509 is arranged between the runner 1 and the runner rim 6 in a sealing manner, and a plurality of magnetic fluid grooves 510 capable of accommodating magnetic fluid are arranged on the inner circumferential wall of the pole shoe 509; the permanent magnet 507, the pole shoe 509 and the magnetic fluid form a magnetic path to form a magnetic seal between the contact surface of the magnetic fluid sealing unit and the runner rim 6.
Furthermore, the permanent magnet 507 is a ring permanent magnet, and under the action of a magnetic field generated by the magnet, magnetic fluid in a gap between the rim 6 of the rotating wheel and the inner circumference of the pole shoe 509 is concentrated by the arranged magnetic fluid groove 510, so that a so-called "O" shaped seal is formed, and a gap channel is blocked to achieve the purpose of sealing, and the sealing performance is better.
In this embodiment, the pole pieces 509 include a first pole piece and a second pole piece on two sides of the magnet, and a plurality of circles of magnetic fluid grooves 510 are formed on the inner circumferential wall of the pole pieces 509, so as to form a plurality of "O" shaped seals, thereby further improving the sealing effect.
Optionally, a flow guide channel communicated with the magnetic fluid groove 510 is arranged in the pole piece 509; the magnetic fluid sealing unit further comprises a magnetic fluid injection mechanism, wherein the outlet end of the magnetic fluid injection mechanism is communicated with the flow guide channel and is suitable for injecting magnetic fluid into the magnetic fluid groove 510.
Optionally, the magnetic fluid injection mechanism comprises a liquid injection pipe 506 and a sealing plug 505, and the outlet end of the liquid injection pipe 506 is connected with the flow guide channel; the sealing plug 505 is arranged at the inlet end of the liquid injection pipe 506 and is suitable for plugging or opening the inlet end of the liquid injection pipe 506.
Alternatively, as shown in fig. 3, the sealing plug 505 is a screw plug, the outlet end (i.e. end B in fig. 3) of the liquid injection pipe 506 is provided with an external thread, the flow guide channel of the pole piece 509 is provided with an internal thread, and the outlet end of the liquid injection pipe 506 is threadedly mounted on the pole pieces 509 at both sides. The inlet end (i.e., end C in fig. 3) of the liquid injection pipe 506 is an internal thread for installing a screw plug, so as to plug the magnetic fluid injected into the liquid injection pipe 506 and prevent the magnetic fluid from overflowing. The liquid injection pipe 506 is connected with the pole shoe 509 and the screw plug in a thread matching mode, the connection mode is simple, and the sealing performance can be effectively ensured.
Optionally, the flow channel 1 is provided with an installation port for installing the magnetic fluid injection mechanism; the injection tube 506 is secured within the mounting opening by a retaining nut 504.
Optionally, the fastening nut 504 is a tapered fastening nut, the fastening nut 504 has an inner tapered surface inside, the inlet end of the liquid injection pipe 506 is tapered, and the outer peripheral wall of the liquid injection pipe 506 is formed with an outer tapered surface matching with the inner tapered surface.
According to the rim sealing device of the water-turbine generator set provided by the embodiment of the invention, the inlet end of the liquid injection pipe 506 is arranged in a conical shape to form an external conical surface matched with the internal conical surface of the fastening nut 504, and the liquid injection pipe 506 is fixed on the flow channel 1 in a conical surface matching mode, so that the stability is better, the swinging of the liquid injection pipe is effectively prevented, and the disassembly is convenient and rapid.
Optionally, the number of the liquid injection pipes 506 is multiple, the multiple liquid injection pipes 506 pass through the flow channel 1 and the magnetic shield 501 and are installed on the pole shoes 509 at two sides, and the multiple liquid injection pipes 506 are uniformly arranged in the circumferential direction of the pole shoes 509 at intervals, so as to ensure that the magnetic fluid in the magnetic fluid groove 510 can be uniformly distributed, and further ensure the sealing effect.
Optionally, the rim sealing device 5 further comprises a magnetic isolation unit disposed between the magnetic fluid sealing unit and the rotor connecting portion 601, and adapted to isolate the magnetic fluid sealing unit from the generator.
Optionally, a first mounting part 101 for mounting a generator and a second mounting part 102 for mounting the rim sealing device 5 are arranged on the circumference of the water turbine runner 1; the second mounting portions 102 are located on two sides of the first mounting portion 101, and the first mounting portion 101 and the second mounting portion 102 are connected with each other and are arranged in a step shape.
Specifically, an annular mounting opening is provided in the turbine runner 1, and the second mounting portion 102 includes a first annular sidewall and a second annular sidewall connected to two side edges of the annular mounting opening, a first annular peripheral wall extending from the first annular sidewall to the center, and a second annular peripheral wall extending from the second annular sidewall to the center. And a mounting cavity for mounting the rim sealing device 5 is formed between the first annular side wall and the second annular side wall and between the first annular peripheral wall and the second annular peripheral wall.
The first mounting portion 101 includes a third annular side wall extending from an end edge of the first annular peripheral wall to an outer periphery, and a fourth annular side wall extending from an end edge of the second annular peripheral wall to an outer periphery, and a mounting space for mounting the generator is formed between the third annular side wall and the fourth annular side wall.
The extending direction of the first annular side wall, the second annular side wall, the third annular side wall and the fourth annular side wall is perpendicular to the axial direction of the flow channel 1, and the extending direction of the first annular peripheral wall and the second annular peripheral wall is the same as the axial direction of the flow channel 1.
Further, the magnetism isolating unit is a magnetism isolating cover 501 fixed on the inner wall of the second installation part 102, a magnetism isolating space is formed in the second installation part 102 through the magnetism isolating cover 501, and the Y-shaped sealing unit 503 and the magnetic fluid sealing unit are both arranged in the magnetism isolating space so as to avoid magnetic interference between the magnetic fluid sealing unit and the generator.
Alternatively, the magnetism isolating cover 501 comprises an annular peripheral side wall and an annular end side wall which are connected with each other, and the annular peripheral side wall is fixed on the inner peripheral wall of the second mounting part 102; the annular end side wall is located on a circumferential edge of the annular peripheral side wall on a side close to the first mounting portion 101; the magnetic isolation space is formed between the inner wall of the magnetic isolation cover 501 and the runner rim 6, and the side wall of the annular end is blocked between the magnetic fluid sealing unit and the installation cavity of the first installation part 101.
Optionally, the magnetic fluid sealing unit further comprises a sealing ring 508 mounted on the outer periphery side of the pole piece 509, and the sealing ring 508 is used for static sealing of the magnetic shield 501 and the pole piece 509 to prevent water from entering the installation space of the generator through the gap between the magnetic shield 501 and the pole piece 509.
Specifically, be provided with the tooth's socket on the all lateral walls of annular of magnetism shield 501, be provided with the protruding muscle of grafting on the runner inside lining, perhaps, be provided with the protruding muscle of grafting on the all lateral walls of annular of magnetism shield 501, be provided with the tooth's socket on the runner inside lining, magnetism shield 501 inserts the runner inside lining through tooth's socket or the protruding muscle of grafting and fixes, can prevent effectively that magnetism shield 501 from at 1 internal rotations of runner, influencing the sealed effect of the sealed unit of magnetic current body and the sealed unit 503 of Y type.
Optionally, the rim sealing device 5 further includes a fixing retaining ring 502, the fixing retaining ring 502 is installed in a ring shape on one side of the magnetic shield 501 far away from the annular end side wall, and the fixing retaining ring 502 is adapted to clamp and fix the Y-shaped sealing unit 503 and the magnetic fluid sealing unit on the magnetic shield 501.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Variations and modifications in other variations may occur to those skilled in the art based upon the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The rim sealing device of the water turbine generator set is characterized in that the rim sealing device is arranged between a water turbine runner and a runner rim, and a rotor connecting part suitable for being connected with a rotor of a generator is arranged on the runner rim;
the wheel rim sealing device comprises a magnetic fluid sealing unit and a Y-shaped sealing unit which are respectively arranged on two sides of the rotor connecting part along the axial direction of the flow channel, and the magnetic fluid sealing unit is positioned between the Y-shaped sealing unit and the rotor connecting part;
the magnetic fluid sealing unit and the Y-shaped sealing unit are both of annular structures, the axial direction of each annular structure is the same as that of the runner, the outer peripheral sides of the magnetic fluid sealing unit and the Y-shaped sealing unit are in sealing fit with the runner, and the inner peripheral sides of the magnetic fluid sealing unit and the Y-shaped sealing unit are in sealing fit with the rim of the rotating wheel.
2. The rim sealing device of the water turbine generator set according to claim 1, wherein the Y-shaped sealing unit is provided with a water-facing sealing lip and a water-backing sealing lip which are arranged at a set opening angle, and the water-facing sealing lip and the water-backing sealing lip are suitable for being in sealing contact with the rim of the runner.
3. The rim sealing device of a hydroelectric generating set according to claim 1, wherein the magnetic fluid sealing unit comprises:
a permanent magnet;
the pole shoe is arranged between the runner and the rim of the rotating wheel in a sealing way, and a plurality of magnetic fluid grooves capable of containing magnetic fluid are arranged on the inner circumferential wall of the pole shoe;
the permanent magnets, the pole shoes and the magnetic fluid form a magnetic path so as to form magnetic sealing between the magnetic fluid sealing unit and the contact surface of the rim of the rotating wheel.
4. The rim sealing device of the water turbine generator set according to claim 3, wherein a flow guide channel communicated with the magnetic fluid groove is arranged in the pole shoe;
the magnetic fluid sealing unit also comprises a magnetic fluid injection mechanism, wherein the outlet end of the magnetic fluid injection mechanism is communicated with the flow guide channel and is suitable for injecting magnetic fluid into the magnetic fluid groove.
5. The rim sealing device of a hydroelectric generating set according to claim 4, wherein the magnetic fluid injection mechanism comprises:
the outlet end of the liquid injection pipe is connected with the flow guide channel;
and the sealing plug is arranged at the inlet end of the liquid injection pipe and is suitable for plugging or opening the inlet end of the liquid injection pipe.
6. The rim sealing device of the water turbine generator set according to claim 5, wherein the runner is provided with a mounting opening for mounting the magnetic fluid injection mechanism;
annotate the liquid pipe and pass through fastening nut to be fixed in the installing port, fastening nut is inside to have an interior conical surface, the entrance point of annotating the liquid pipe is the toper setting, the periphery wall of annotating the liquid pipe be formed with interior conical surface complex external cone face.
7. The rim sealing device of a hydro-turbo set according to any one of claims 1 to 6, further comprising:
and the magnetic isolation unit is arranged between the magnetic fluid sealing unit and the rotor connecting part and is suitable for isolating the magnetic fluid sealing unit from the generator.
8. The rim sealing device of the water turbine generator set according to claim 7, wherein a first mounting part for mounting a generator and a second mounting part for mounting the rim sealing device are arranged on the periphery of the water turbine runner;
the second mounting parts are positioned at two sides of the first mounting part, and the first mounting part and the second mounting part are mutually connected and are arranged in a step shape;
the magnetism isolating unit is fixed the magnetism isolating cover on the inner wall of the second installation part, the magnetism isolating cover separates a magnetism isolating space in the second installation part, and the Y-shaped sealing unit and the magnetic fluid sealing unit are both arranged in the magnetism isolating space.
9. The rim sealing device of a hydroelectric generating set according to claim 8, wherein the magnetism isolating cover comprises:
an annular peripheral side wall fixed to an inner peripheral wall of the second mounting portion;
an annular end side wall connected to a circumferential edge of the annular peripheral side wall on a side close to the first mounting portion;
the magnetic isolation space is formed between the inner wall of the magnetic isolation cover and the rim of the rotating wheel, and the side wall of the annular end is blocked between the magnetic fluid sealing unit and the mounting cavity of the first mounting part.
10. The rim sealing device of a hydro-turbo set according to claim 8, further comprising:
and the fixed retainer ring is arranged on one side of the magnetic shield far away from the side wall of the annular end, and is suitable for clamping and fixing the Y-shaped sealing unit and the magnetic fluid sealing unit on the magnetic shield.
Priority Applications (1)
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| CN202210125993.XA CN114458515B (en) | 2022-02-10 | 2022-02-10 | Rim sealing device of hydroelectric generating set |
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| CN202210125993.XA CN114458515B (en) | 2022-02-10 | 2022-02-10 | Rim sealing device of hydroelectric generating set |
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| CN114458515B CN114458515B (en) | 2023-06-06 |
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Citations (8)
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| JPS6238877A (en) * | 1985-08-14 | 1987-02-19 | Ebara Corp | Shaft-seal apparatus for hydraulic machinery using magnetic fluid |
| JPH06265027A (en) * | 1993-02-23 | 1994-09-20 | Fuji Electric Co Ltd | Magnetic fluid utilizing shaft seal sealing device for vertical shaft water turbine generator |
| CN104141580A (en) * | 2013-05-10 | 2014-11-12 | 江苏航天水力设备有限公司 | Straight flow turbine |
| CN107013399A (en) * | 2017-05-26 | 2017-08-04 | 西安理工大学 | One kind determines oar tubular turbine using gear-driven |
| CN107893854A (en) * | 2017-12-13 | 2018-04-10 | 广西科技大学 | A kind of reciprocating motion magnetic fluid sealing structure |
| CN112112971A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Floating ring type magnetic liquid sealing device |
| CN112682514A (en) * | 2021-03-22 | 2021-04-20 | 上海鑫蓝海自动化科技有限公司 | Axial magnetic fluid dynamic sealing structure |
| CN112963549A (en) * | 2021-02-04 | 2021-06-15 | 西华大学 | Variable-tooth magnetic fluid sealing device based on magnetic fluid compensation structure |
-
2022
- 2022-02-10 CN CN202210125993.XA patent/CN114458515B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6238877A (en) * | 1985-08-14 | 1987-02-19 | Ebara Corp | Shaft-seal apparatus for hydraulic machinery using magnetic fluid |
| JPH06265027A (en) * | 1993-02-23 | 1994-09-20 | Fuji Electric Co Ltd | Magnetic fluid utilizing shaft seal sealing device for vertical shaft water turbine generator |
| CN104141580A (en) * | 2013-05-10 | 2014-11-12 | 江苏航天水力设备有限公司 | Straight flow turbine |
| CN107013399A (en) * | 2017-05-26 | 2017-08-04 | 西安理工大学 | One kind determines oar tubular turbine using gear-driven |
| CN107893854A (en) * | 2017-12-13 | 2018-04-10 | 广西科技大学 | A kind of reciprocating motion magnetic fluid sealing structure |
| CN112112971A (en) * | 2020-10-30 | 2020-12-22 | 清华大学 | Floating ring type magnetic liquid sealing device |
| CN112963549A (en) * | 2021-02-04 | 2021-06-15 | 西华大学 | Variable-tooth magnetic fluid sealing device based on magnetic fluid compensation structure |
| CN112682514A (en) * | 2021-03-22 | 2021-04-20 | 上海鑫蓝海自动化科技有限公司 | Axial magnetic fluid dynamic sealing structure |
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| CN114458515B (en) | 2023-06-06 |
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