CN114458515B - Rim sealing device of hydroelectric generating set - Google Patents
Rim sealing device of hydroelectric generating set Download PDFInfo
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- CN114458515B CN114458515B CN202210125993.XA CN202210125993A CN114458515B CN 114458515 B CN114458515 B CN 114458515B CN 202210125993 A CN202210125993 A CN 202210125993A CN 114458515 B CN114458515 B CN 114458515B
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- magnetic fluid
- sealing unit
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- 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 at 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 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. According to the invention, zero leakage can be realized by combining the Y-shaped seal and the magnetic fluid seal, and the Y-shaped seal unit is arranged at the outer side of the magnetic fluid seal unit, so that a large amount of water in the 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, the magnetic fluid sealing unit can also prevent particles such as sediment in water flow 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 has an important influence on the safe operation of the water turbine. In particular, the generator rotor of the full through-flow turbine is directly arranged on the rim of the rotating turbine blade, so that a seal is required to be arranged between the rotating wheel and the generator rotor, and in order to ensure the normal operation of the generator, the rim of the turbine is required to be sealed so that the water flow in the flow channel cannot contact the generator rotor. The related prior art adopts the traditional rubber sealing mode to seal the rim of the rotating wheel, and the sealing mode is single, so that the problems of poor pressure resistance and wear resistance and unreliable sealing exist.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems that the sealing mode between the rim of the rotating wheel of the hydroelectric generating set and the generator is single and the sealing is unreliable in the prior art, thereby providing the rim sealing device of the hydroelectric generating set.
In order to achieve the above purpose, the embodiment of the invention provides a rim sealing device of a hydroelectric generating set, wherein the rim sealing device is arranged between a runner of a water turbine and a rim of a rotating wheel, and a rotor connecting part suitable for being connected with a rotor of a generator is arranged on the rim of the rotating wheel;
the rim sealing device comprises a magnetic fluid sealing unit and a Y-shaped sealing unit which are respectively arranged at 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 of annular structures with the axial direction being 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 runner rim.
Optionally, the Y-shaped sealing units comprise a first Y-shaped sealing unit and a second Y-shaped sealing unit which are positioned 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 back water sealing lip which are arranged at a set opening angle, and the water facing sealing lip and the back water sealing lip are suitable for being in sealing contact with the rim of the rotating wheel.
Optionally, the magnetic fluid sealing unit includes:
a permanent magnet;
the pole shoe is arranged between the runner and the runner rim in a sealing way, and a plurality of magnetic fluid grooves capable of containing magnetic fluid are formed in the inner peripheral wall of the pole shoe;
the permanent magnet, the pole shoe and the magnetic fluid form a magnetic path so as to form magnetic seal between the contact surface of the magnetic fluid sealing unit and the rim of the rotating wheel.
Optionally, a diversion channel communicated with the magnetic fluid groove is arranged in the pole shoe;
the magnetic fluid sealing unit further comprises a magnetic fluid injection mechanism, and the outlet end of the magnetic fluid injection mechanism is communicated with the diversion channel and is suitable for injecting magnetic fluid into the magnetic fluid groove.
Optionally, the magnetic fluid injection mechanism includes:
the outlet end of the liquid injection pipe is connected with the diversion channel;
the sealing plug is arranged at the inlet end of the liquid injection pipe and is suitable for sealing or opening the inlet end of the liquid injection pipe.
Optionally, a mounting port for mounting the magnetic fluid injection mechanism is formed in the runner;
the liquid injection pipe is fixed in the mounting port through a fastening nut, an inner conical surface is arranged in the fastening nut, the inlet end of the liquid injection pipe is arranged in a conical shape, and an outer conical surface matched with the inner conical surface is formed on the peripheral wall of the liquid injection pipe.
Optionally, the rim sealing device further comprises:
the magnetism isolating 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 the generator and a second mounting part for mounting the 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 connected with each other and are arranged in a step shape;
the magnetic isolation unit is a magnetic isolation cover fixed on the inner wall of the second installation part, a magnetic isolation space is formed in the second installation part by the magnetic isolation cover, and the Y-shaped sealing unit and the magnetic fluid sealing unit are both arranged in the magnetic isolation space.
Optionally, the magnetism isolating cover includes:
an annular peripheral wall fixed to an inner peripheral wall of the second mounting portion;
the annular end side wall is connected to the circumferential edge of the annular circumferential side wall, which is close to the first mounting part side;
the inner wall of the magnetism isolating cover and the rim of the rotating wheel form the magnetism isolating space, 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 check ring is arranged on one side of the magnetism isolating cover, which is 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 magnetism isolating cover.
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, the Y-shaped seal and the magnetic fluid seal are arranged in the hydroelectric generating set at the same time, and the sealing is realized in a combined mode of the Y-shaped seal and the magnetic fluid seal, so that zero leakage can be realized due to the magnetic fluid seal, and the problem of small leakage of the Y-shaped seal can be further solved, the full-through-flow hydroelectric generating set is reliable in sealing, and popularization and application of the full-through-flow hydroelectric generating set are facilitated.
2. According to the rim sealing device of the hydroelectric generating set, 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 a large amount of water in the flow channel is prevented from entering the installation space of the 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 sediment in water flow are prevented from entering the magnetic fluid groove, and the sealing effect of magnetic fluid is ensured.
3. According to the rim sealing device for the hydroelectric generating set, provided by the embodiment of the invention, the inlet end of the liquid injection pipe is in a conical shape, so that the outer conical surface matched with the inner conical surface of the fastening nut is formed, the liquid injection pipe is fixed on the runner in a conical surface matching mode, the stability is better, the swing of the liquid injection pipe is effectively prevented, and the disassembly is convenient and quick.
4. According to the rim sealing device for the hydroelectric generating set, 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 serial momentum is large, and the sealing effect is not affected. When the rotor swings with the axis as the center, 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 runner through a tooth slot to be fixed, so that the magnetism isolating cover can be effectively prevented from rotating in the runner 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 that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a cross-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 A in FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a magnetic fluid injection mechanism mated with a fastening nut in accordance with an embodiment of the present invention.
Reference numerals:
1. a flow passage; 101. a first mounting portion; 102. a second mounting portion;
2. fixing a flow guiding device; 3. a movable guide vane device; 4. a main shaft;
5. rim sealing means; 501. a magnetism isolating cover; 502. a retainer ring; 503. a Y-shaped sealing unit; 504. a fastening nut; 505. a screw plug; 506. a liquid injection pipe; 507. a permanent magnet; 508. a seal ring; 509. pole shoes; 510. a magnetic fluid tank;
6. a wheel rim; 601. a rotor connection part; 7. a stator support; 8. a stator; 9. a rotor; 10. and (3) a water turbine blade.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by a worker of ordinary skill in the art without making any inventive effort, are intended to be within the scope of this invention based on the embodiments of this invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention can be understood in a specific case by a worker of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention aims to solve the technical problems that in the prior art, a sealing mode between a rim of a rotating wheel of a hydroelectric generating set and a generator is single and sealing is unreliable, so that the rim sealing device of the hydroelectric generating set is provided.
Example 1
As shown in fig. 1 to 3, the hydroelectric generating set according to the embodiment of the invention comprises a runner 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 a turbine blade 10. The generator comprises a rotor 9, a stator 8 and a stator bracket 7.
The inner side of the runner 1 in the embodiment is provided with a runner lining, and the rim sealing device 5 is arranged on the runner lining. The fixed flow guiding devices 2 are arranged on the two sides of the upstream and the 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 at the outer edge of the turbine blades 10 through the runner rim 6. The rim sealing device 5 is arranged on the inner side of the lining of the runner 1 and is matched and sealed with the rim 6 of the runner. The generator stator 8 is fixed by a stator bracket 7.
The rim sealing device 5 provided by the embodiment is arranged between the water turbine runner 1 and the runner rim 6, so that water in the runner 1 is prevented from entering the generator. The rotor wheel rim 6 is provided with a rotor connection 601 adapted to be connected with the rotor 9 of the generator; the runner rim 6 comprises a rim body fixedly arranged on the periphery of the turbine blades 10, the rim body is of an annular structure, and the axial direction of the rim body is the same as the axial direction of the runner 1. Along the axial direction of the rim body, the rotor connecting part 601 is an annular protruding 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 provided at both sides of the rotor connection part 601 in the axial direction of the flow channel 1. According to the rim sealing device for the hydroelectric generating set, the magnetic fluid sealing unit and the Y-shaped sealing unit 503 are arranged along the axial direction of the flow channel 1, and when the water thrust in the flow channel 1 changes greatly along the axial direction, the serial momentum of the rotor 9 is larger, and the sealing effect is not affected. When the rotor 9 swings around the axis, the Y-shaped sealing unit 503 can provide a certain supporting force, and instability of the unit is reduced.
Further, the magnetic fluid sealing unit is located between the Y-shaped sealing unit 503 and the rotor connection part 601; the magnetic fluid sealing unit and the Y-shaped sealing unit 503 are of annular structures with the axial direction being 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, the Y-shaped seal and the magnetic fluid seal are arranged in the hydroelectric generating set at the same time, and the sealing is realized in a combined mode of the Y-shaped seal and the magnetic fluid seal, so that zero leakage can be realized due to the magnetic fluid seal, and the problem of small leakage of the Y-shaped seal can be further solved, the full-through-flow hydroelectric generating set is reliable in sealing, and popularization and application of the full-through-flow hydroelectric generating set are facilitated. In addition, by arranging the magnetic fluid sealing unit between the Y-shaped sealing unit 503 and the rotor connecting part 601, 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 water in front of the magnetic fluid sealing unit, and improves the reliability of magnetic fluid sealing; on the other hand, particles such as sediment in water flow are prevented from entering the magnetic fluid sealing unit, and the sealing effect of the magnetic fluid is ensured.
Alternatively, the Y-shaped sealing unit 503 has a water-facing sealing lip and a back-water sealing lip disposed at a set opening angle, which are adapted to be in sealing contact with the rotor rim 6. The water-facing sealing lips are positioned on the edge sides close to the two ends of the rotating wheel rim 6, so that a large amount of water and particles such as sediment in water flow can be effectively prevented from entering the sealing device and the generator through gaps between the edges of 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 secondary sealing role, 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 rim 6 of the wheel.
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 located between one side of the rotor connecting portion 601 and the first Y-shaped sealing unit, and the second magnetic fluid sealing unit is located between the other side of the rotor connecting portion 601 and the second Y-shaped sealing unit.
The Y-shaped sealing unit 503 in this embodiment 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 rotating wheel by means of its open sealing lip. In the absence of pressure, only a small contact pressure is generated by deformation of the lip tip. When the pressure rises, the distribution form and the size of the contact pressure are further changed, the lip is tightly matched with the peripheral wall surface of the rim 6 of the rotating wheel, so that the sealing performance and the pressure resistance are better, and the application pressure range is wide. Under the sealing condition, each point where the Y-shaped sealing ring is contacted with a sealing medium is provided with normal pressure equal to the pressure of the medium, so that the bottom of the sealing lip is axially compressed, the sealing lip is circumferentially compressed, the sealing lip is contacted with the sealing surface and widened, meanwhile, the contact stress is increased, and the sealing performance is reliable. And after the sealing lip edge is worn, the lip edge has certain automatic compensation capability 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 way, and a plurality of magnetic fluid grooves 510 capable of containing magnetic fluid are arranged on the inner peripheral wall of the pole shoe 509; the permanent magnets 507, pole shoes 509, magnetic fluid form a magnetic path to form a magnetic seal between the magnetic fluid sealing unit and the contact surface of the rotor rim 6.
Furthermore, the permanent magnet 507 is a ring permanent magnet, and under the action of the magnetic field generated by the magnet, the magnetic fluid between the gap on the inner periphery side of the rim 6 of the rotating wheel and the pole shoe 509 is concentrated through the magnetic fluid groove 510, so that the gap is sealed in an O-shaped way, the gap channel is blocked, and the sealing purpose is achieved, and the sealing performance is better.
In this embodiment, the pole shoe 509 includes a first pole shoe and a second pole shoe located at two sides of the magnet, and a plurality of "O" seals are formed by a plurality of magnetic fluid grooves 510 formed in the inner peripheral wall of the pole shoe 509, so as to further improve the sealing effect.
Optionally, a diversion channel communicated with the magnetic fluid groove 510 is arranged in the pole shoe 509; the magnetic fluid sealing unit further comprises a magnetic fluid injection mechanism, and the outlet end of the magnetic fluid injection mechanism is communicated with the diversion 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, wherein the outlet end of the liquid injection pipe 506 is connected with the diversion channel; the sealing plug 505 is disposed at the inlet end of the liquid injection pipe 506, and is adapted to seal or open the inlet end of the liquid injection pipe 506.
Optionally, as shown in fig. 3, the sealing plug 505 is a screw plug, the outlet end (i.e. the end B in fig. 3) of the liquid injection pipe 506 is provided with external threads, the flow guiding channel of the pole shoe 509 is provided with internal threads, and the outlet end of the liquid injection pipe 506 is screw-mounted on the pole shoes 509 at two sides. The inlet end (i.e., the C end in fig. 3) of the liquid injection pipe 506 is an internal thread for installing a screw plug, so as to realize plugging of the magnetic fluid injected into the liquid injection pipe 506 and avoid overflow of the magnetic fluid. The liquid injection pipe 506 is connected with the pole shoe 509 and the screw plug in a threaded fit manner, the connection manner is simple, and the tightness can be effectively ensured.
Optionally, a mounting port for mounting the magnetic fluid injection mechanism is arranged on the runner 1; the filler pipe 506 is fixed in the mounting port by a fastening nut 504.
Optionally, the fastening nut 504 is a conical fastening nut, an inner conical surface is provided inside the fastening nut 504, an inlet end of the liquid injection pipe 506 is provided in a conical shape, and an outer conical surface matched with the inner conical surface is formed on an outer peripheral wall of the liquid injection pipe 506.
According to the rim sealing device for the hydroelectric generating set, provided by the embodiment of the invention, the inlet end of the liquid injection pipe 506 is in a conical shape, so that the outer conical surface matched with the inner conical surface of the fastening nut 504 is formed, the liquid injection pipe 506 is fixed on the runner 1 in a conical surface matching mode, the stability is better, the swing of the liquid injection pipe is effectively prevented, and the disassembly is convenient and quick.
Optionally, the number of the liquid injection pipes 506 is multiple, the plurality of liquid injection pipes 506 pass through the runner 1 and the magnetism isolating cover 501 and are mounted on the pole shoes 509 at two sides, and the plurality of liquid injection pipes 506 are uniformly arranged at intervals in the circumferential direction of the pole shoes 509, so that the magnetic fluid in the magnetic fluid groove 510 can be uniformly distributed, and the sealing effect is further ensured.
Optionally, the rim sealing device 5 further comprises a magnetic shielding unit arranged between the magnetic fluid sealing unit and the rotor connection 601, adapted to shield the magnetic fluid sealing unit from the generator.
Alternatively, the turbine runner 1 is provided with a first mounting portion 101 for mounting a generator and a second mounting portion 102 for mounting the rim sealing device 5 in the circumferential direction; the second mounting portions 102 are located at two sides of the first mounting portion 101, and the first mounting portion 101 and the second mounting portion 102 are connected to each other and are arranged in a step shape.
Specifically, the water turbine runner 1 is provided with an annular mounting opening, 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 toward the center, and a second annular peripheral wall extending from the second annular sidewall toward the center. The first and second annular side walls and the first and second annular peripheral walls form therebetween a mounting cavity for mounting the rim sealing device 5.
The first mounting portion 101 includes a third annular side wall of which an end edge of the first annular peripheral wall extends to the outer periphery, and a fourth annular side wall of which an end edge of the second annular peripheral wall extends to the 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 directions of the first annular side wall, the second annular side wall, the third annular side wall and the fourth annular side wall are perpendicular to the axis direction of the flow channel 1, and the extending directions of the first annular peripheral wall and the second annular peripheral wall are the same as the axis direction of the flow channel 1.
Further, the magnetic isolation unit is a magnetic isolation cover 501 fixed on the inner wall of the second installation portion 102, a magnetic isolation space is separated from the magnetic isolation cover 501 in the second installation portion 102, and the Y-shaped sealing unit 503 and the magnetic fluid sealing unit are both arranged in the magnetic isolation space, so that magnetic interference between the magnetic fluid sealing unit and the generator is avoided.
Alternatively, the magnetism isolating cover 501 includes an annular peripheral side wall and an annular end side wall connected to each other, the annular peripheral side wall being fixed to an inner peripheral wall of the second mounting portion 102; the annular end side wall is positioned on the circumferential edge of the annular peripheral side wall near the first mounting part 101 side; the inner wall of the magnetism isolating cover 501 and the wheel rim 6 form the magnetism isolating space, and the annular end side wall is blocked between the magnetic fluid sealing unit and the mounting cavity of the first mounting part 101.
Optionally, the magnetic fluid sealing unit further comprises a sealing ring 508 installed on the outer peripheral side of the pole shoe 509, wherein the sealing ring 508 is used for sealing the magnetic shielding cover 501 and the pole shoe 509, and preventing water flow from entering the installation space of the generator through the gap between the magnetic shielding cover 501 and the pole shoe 509.
Specifically, be provided with the tooth's socket on the annular week lateral wall of magnetism isolating cover 501, be provided with grafting protruding muscle on the runner inside lining, perhaps be provided with grafting protruding muscle on the annular week lateral wall of magnetism isolating cover 501, be provided with the tooth's socket on the runner inside lining, magnetism isolating cover 501 inserts runner inside lining fixedly through tooth's socket or grafting protruding muscle, can prevent effectively that magnetism isolating cover 501 from rotating in runner 1, influences the sealed effect of magnetic fluid sealing unit and Y type sealing unit 503.
Optionally, the rim sealing device 5 further includes a fixing collar 502, where the fixing collar 502 is installed on a side of the magnetic shielding cover 501 away from the annular end side wall in an annular shape, and the fixing collar 502 is adapted to clamp and fix the Y-type sealing unit 503 and the magnetic fluid sealing unit on the magnetic shielding cover 501.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the various aspects of the invention will be apparent to persons of ordinary skill in the art upon reading the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (5)
1. The rim sealing device of the hydroelectric generating 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 which is suitable for being connected with a rotor of a generator is arranged on the runner rim;
the rim sealing device comprises a magnetic fluid sealing unit and a Y-shaped sealing unit which are respectively arranged at 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 of annular structures with the axial direction being 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 runner;
the Y-shaped sealing unit is provided with a water facing sealing lip and a back water sealing lip which are arranged at a set opening angle, and the water facing sealing lip and the back water sealing lip are suitable for being in sealing contact with the rim of the rotating wheel;
the magnetic fluid sealing unit includes:
a permanent magnet;
the pole shoe is arranged between the runner and the runner rim in a sealing way, and a plurality of magnetic fluid grooves capable of containing magnetic fluid are formed in the inner peripheral wall of the pole shoe;
the permanent magnet, the pole shoe and the magnetic fluid form a magnetic path so as to form magnetic seal between the contact surfaces of the magnetic fluid sealing unit and the rim of the rotating wheel;
a diversion channel communicated with the magnetic fluid groove is arranged in the pole shoe;
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 diversion channel and is suitable for injecting magnetic fluid into the magnetic fluid groove;
the magnetic fluid injection mechanism includes:
the outlet end of the liquid injection pipe is connected with the diversion channel;
the sealing plug is arranged at the inlet end of the liquid injection pipe and is suitable for sealing or opening the inlet end of the liquid injection pipe;
the runner is provided with a mounting port for mounting the magnetic fluid injection mechanism;
the liquid injection pipe is fixed in the mounting port through a fastening nut, an inner conical surface is arranged in the fastening nut, the inlet end of the liquid injection pipe is arranged in a conical shape, and an outer conical surface matched with the inner conical surface is formed on the peripheral wall of the liquid injection pipe.
2. The hydro-generator set rim sealing apparatus of claim 1, further comprising:
the magnetism isolating 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.
3. The rim sealing device of a hydroelectric generating set according to claim 2, wherein a first mounting portion for mounting a generator and a second mounting portion for mounting the rim sealing device are provided in the circumferential direction 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 connected with each other and are arranged in a step shape;
the magnetic isolation unit is a magnetic isolation cover fixed on the inner wall of the second installation part, a magnetic isolation space is formed in the second installation part by the magnetic isolation cover, and the Y-shaped sealing unit and the magnetic fluid sealing unit are both arranged in the magnetic isolation space.
4. A hydroelectric generating set rim sealing device according to claim 3, wherein the magnetism isolating cover comprises:
an annular peripheral wall fixed to an inner peripheral wall of the second mounting portion;
the annular end side wall is connected to the circumferential edge of the annular circumferential side wall, which is close to the first mounting part side;
the inner wall of the magnetism isolating cover and the rim of the rotating wheel form the magnetism isolating space, 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.
5. The hydro-generator set rim seal assembly of claim 4, further comprising:
and the fixed check ring is arranged on one side of the magnetism isolating cover, which is 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 magnetism isolating cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210125993.XA CN114458515B (en) | 2022-02-10 | 2022-02-10 | Rim sealing device of hydroelectric generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210125993.XA CN114458515B (en) | 2022-02-10 | 2022-02-10 | Rim sealing device of hydroelectric generating set |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114458515A CN114458515A (en) | 2022-05-10 |
| CN114458515B true CN114458515B (en) | 2023-06-06 |
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| CN202210125993.XA Active CN114458515B (en) | 2022-02-10 | 2022-02-10 | Rim sealing device of hydroelectric generating set |
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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 |
| 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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|---|---|
| CN114458515A (en) | 2022-05-10 |
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