CN111262366A - Magnetic pole fixing structure of high-speed hydraulic turbine unit - Google Patents
Magnetic pole fixing structure of high-speed hydraulic turbine unit Download PDFInfo
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- CN111262366A CN111262366A CN202010074124.XA CN202010074124A CN111262366A CN 111262366 A CN111262366 A CN 111262366A CN 202010074124 A CN202010074124 A CN 202010074124A CN 111262366 A CN111262366 A CN 111262366A
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a magnetic pole fixing structure of a high-speed hydraulic turbine unit, which comprises a rotor with a plurality of magnetic pole coils at the edge, wherein adjacent magnetic pole coils are connected through detachable connection between the end parts of damping rings at the outer sides, the magnetic pole coils are spliced with the rotor through connecting parts, wedge-shaped supporting blocks are arranged in fixing clamping grooves of two adjacent magnetic pole coils, the wedge-shaped supporting blocks and a sliding rod with the inner end fixed on the rotor form radial sliding connection, coil pressing blocks are respectively arranged at two sides of each wedge-shaped supporting block, one side of each coil pressing block is in sliding connection with the corresponding wedge-shaped supporting block, an assembly gap is arranged between the other side of each coil pressing block and the corresponding magnetic pole coil, a limiting ring attached to the corresponding coil pressing block is arranged at the outer end of each sliding rod, a reset pressure spring is sleeved on each sliding. The invention can ensure the reliable connection of the magnetic pole coil on the rotor, avoid the shedding phenomenon and facilitate the disassembly, assembly and maintenance of the magnetic pole coil.
Description
Technical Field
The invention relates to the technical field of hydraulic turbine units, in particular to a magnetic pole fixing structure of a high-speed hydraulic turbine unit.
Background
With the enhancement of energy conservation and environmental protection consciousness of people, hydroelectric power generation as a green energy source is being vigorously developed, and in the field of hydroelectric power generation, a water turbine set is a key part and generally comprises a stator and a rotor rotatably arranged in the stator, wherein a plurality of magnetic pole coils are arranged on the edge of the rotor, and when water flow formed by water level difference of a reservoir drives the rotor to rotate, electric energy can be generated. Because the water head (commonly called water head) of the reservoir is larger and larger, the size and the weight of the water turbine set are correspondingly larger and larger, and the rotating speed of the rotor is higher and higher, the centrifugal force of the magnetic pole coil in the working chamber is larger and larger. For example, for some high capacity water turbine units for ultra-high head, the capacity is greater than 120MW, the maximum operating head may exceed 650 meters, the rated speed of the unit is above 600 r/min, and the weight of the pole coils (along with the copper bars) may be in tons. Therefore, when the water turbine set is in operation, the rotor rotating at high speed can cause the magnetic pole coil to form a large radial centrifugal force. When the magnetic pole coil is not reliably fixed on the rotor or runs for a long time, the magnetic pole coil is easy to separate from the rotor due to huge centrifugal force, and further production accidents are caused.
In addition, when the speed of the rotor is suddenly changed, such as during starting or stopping, the magnetic pole coil at the edge of the rotor has a large acceleration, so that a force in a line tangent direction is generated, and the magnetic pole coil is easy to deflect and even get rid of the rotor.
Although also someone is through setting up some reinforced structure that are used for consolidating magnetic pole coil at the rotor edge, make magnetic pole coil's joint strength can promote, but current reinforced structure has the inconvenient problem of dismouting usually, especially, when magnetic pole coil need be updated and maintained, owing to receive reinforced structure's restriction, and the clearance between rotor and the stator is less, maintainer dismouting magnetic pole coil in the unable clearance that gets into between rotor and the stator, can only hang whole rotor from the stator, just can demolish reinforced structure and magnetic pole coil and update and maintain, and then increase work load, prolong maintenance cycle, be unfavorable for reducing maintenance cost.
Disclosure of Invention
The invention aims to solve the problems of unreliable connection of a magnetic pole coil and inconvenient disassembly and assembly maintenance of the existing high-speed hydraulic turbine unit, and provides a magnetic pole fixing structure of the high-speed hydraulic turbine unit, which can ensure the reliable connection of the magnetic pole coil on a rotor, avoid the shedding phenomenon and facilitate the disassembly and assembly maintenance of the magnetic pole coil.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnetic pole fixing structure of a high-speed hydraulic turbine set comprises a rotor with a vertical axis and a plurality of magnetic pole coils arranged on the edge of the rotor, wherein each magnetic pole coil comprises an inner connecting part and a damping ring transversely arranged on the upper part of the outer side, the end parts of the damping rings of two adjacent magnetic pole coils form detachable connection, the connecting parts are inserted on the edge of the rotor in the vertical direction, a fixing clamping groove is formed between the opposite side walls of the two adjacent magnetic pole coils, a wedge-shaped supporting block is arranged in the middle of the fixing clamping groove, a sliding hole penetrating through the inner end and the outer end in the radial direction is arranged in the wedge-shaped supporting block, a sliding rod is arranged in the sliding hole, the inner end of the sliding rod is fixed on the edge of the rotor, two side surfaces of the wedge-shaped supporting block, which are close to the magnetic pole coils, are inclined planes from inside to outside, so that the wedge-shaped supporting, form radial sliding connection through spacing spout between coil briquetting one side and the wedge braced block, the opposite side of coil briquetting is the crimping face parallel with the magnetic pole coil lateral wall, is equipped with the fit-up gap between crimping face and magnetic pole coil, and the outer end of slide bar is equipped with the spacing ring that pastes and leans on the coil briquetting, and the cover is equipped with the pressure spring that resets on the slide bar, and the pressure spring outer end is supported to press to the wedge braced block one end that resets, and the other end supports presses the spacing ring.
The magnetic pole coils are uniformly distributed on the circumference of the rotor, so that a fixed clamping groove is formed between the opposite side walls of two adjacent magnetic pole coils. The invention creatively arranges a wedge-shaped supporting block capable of sliding in the radial direction in the fixed clamping groove, and arranges coil pressing blocks on two sides of the wedge-shaped supporting block respectively. Because the connecting part of the magnetic pole coil is inserted on the edge of the rotor along the up-down direction, and an assembly gap is arranged between the compression joint surface of the coil pressing block and the magnetic pole coil. That is to say, when the hydraulic turbine unit stops operating, magnetic pole coil just relies on connecting portion and rotor edge to form the grafting to make each magnetic pole coil concatenate an organic whole in circumference through end to end's damping ring, the damping ring that concatenates together forms the structure of similar chain, and then can bear the radial centrifugal force of magnetic pole coil effectively, avoids magnetic pole coil to break away from the rotor because of the effect of centrifugal force when the rotor rotates at a high speed. The magnetic pole coil and the coil pressing blocks on the two sides are in a separated state. Therefore, when the pole coil needs to be disassembled and maintained, the damping ring is arranged at the upper part of the outer side of the pole coil, so that the damping ring on the outer side of the pole coil needing to be disassembled can be separated from the damping rings of the pole coils on two sides, and then the pole coil is conveniently lifted upwards to be separated from the rotor for maintenance. The repaired magnetic pole coil can be lifted above the rotor and gradually descended, the connecting part of the magnetic pole coil enters the corresponding insertion groove at the edge of the rotor, the insertion fit between the magnetic pole coil and the rotor is restored, and the damping rings at the outer side of the magnetic pole coil are detachably connected with the damping rings of the magnetic pole coils at the two sides. It is understood that the detachable connection can adopt a screw connection structure and the like, thereby being convenient for assembly and disassembly.
Especially, when the hydraulic turbine unit starts to operate and the rotor rotates at a high speed, the wedge-shaped supporting block can be subjected to a great centrifugal force, so that the wedge-shaped supporting block moves outwards along the radial direction of the sliding rod, the coil pressing blocks on the two sides are squeezed open towards the two sides, the crimping surfaces of the coil pressing blocks can be tightly attached to the side surfaces of the magnetic pole coils, the magnetic pole coils are tightly connected into a whole, and the magnetic pole coils are prevented from deflecting when being started and rotating at a high speed. When the hydraulic turbine is stopped and the rotor is decelerated to stop rotation, the centrifugal force of the wedge supporting block is reduced to zero, the reset pressure spring drives the wedge supporting block to move inwards to reset along the sliding rod, correspondingly, the coil pressing blocks on the two sides of the wedge supporting block are drawn close to each other, the pressing surface of the coil pressing block is separated from the side surface of the magnetic pole coil, and therefore the magnetic pole coil needing to be updated and maintained is conveniently dismounted on the premise that the whole rotor is not hoisted.
That is to say, when the rotor of the water turbine rotates at a high speed, the magnetic pole coils are mutually propped and extruded together through the wedge-shaped supporting block and the coil pressing block, and the magnetic pole coils are in a 'pressing' state, so that the deflection of the magnetic pole coils and even the magnetic pole coils are prevented from being thrown away from the rotor; when the magnetic pole coil needs to be disassembled and assembled and the rotor of the water turbine stops rotating, the magnetic pole coil is separated from the coil pressing blocks on the two sides, and the magnetic pole coil is in a loose state at the moment, so that the magnetic pole coil is convenient to disassemble, assemble and maintain.
Preferably, the limiting ring comprises a limiting block in a cuboid shape, a rotating cavity is arranged inside the limiting block, the rotating cavity is a spherical surface, the center of a sphere of the rotating cavity is located at the center of the limiting block, a rotating circular ring is arranged in the rotating cavity, the rotating circular ring comprises two end surfaces and a matching side surface connected between the two end surfaces, the matching side surface is an outer convex spherical surface, the center of the sphere of the rotating circular ring is located at the center of the rotating circular ring and matched with the rotating cavity, a rectangular mounting hole extending inwards to the center of the sphere of the rotating cavity is formed in the center of the outer end surface far away from the magnetic pole coil of the limiting block, an adjusting through hole penetrating through the outer end surface is formed in the center of the inner end surface of the limiting block, the width of the mounting hole is not smaller than the thickness of the rotating circular ring, two opposite width side walls.
In the prior art, the limiting ring on the sliding rod is usually a shaft shoulder-shaped structure integrally formed with the sliding rod, or a separate structure in threaded connection, so as to facilitate processing, manufacturing and assembling. The limiting ring comprises a limiting block and a rotating ring which are of a split structure, and the rotating ring and a rotating cavity of the limiting block form spherical surface matching. Like this, on the one hand, can avoid rotating the ring and deviate from the stopper, ensure that the inboard coil briquetting that faces both sides of stopper plays radial limiting displacement, on the other hand, through 360 degrees swings of stopper, can ensure that the medial surface of stopper pastes the coil briquetting that leans on wedge brace both sides simultaneously balancedly, makes the atress between the coil briquetting of wedge brace both sides and the spacing briquetting balanced, and then ensures that the crimping is balanced in the face of the effort of magnetic pole coil.
Particularly, the axis of the rotating circular ring is perpendicular to the axis of the mounting hole of the limiting block, the width of the mounting hole is not smaller than the thickness of the rotating circular ring, two opposite width side walls of the mounting hole are tangent to the rotating cavity, namely, the length of the mounting hole is equal to the diameter of the matching side face of the rotating cavity and the rotating circular ring, and the mounting hole extends inwards to the position of the spherical center of the rotating cavity. Therefore, the rotating ring can be placed in the rectangular mounting hole until the spherical center of the matching side face of the rotating ring is superposed with the spherical center of the rotating cavity, then the rotating ring is rotated by 90 degrees, so that the axis of the rotating ring is basically superposed with the axis of the limiting block, and the rotating ring and the rotating cavity are matched in a spherical rotating mode. Then, the sliding rod sleeved with the wedge-shaped supporting block and the reset pressure spring can be connected with the rotating circular ring, so that the limiting block limits the coil pressing blocks on two sides in the radial direction, and the rotating circular ring is effectively prevented from being separated from the rotating cavity of the limiting block.
Preferably, a threaded hole penetrating through the two end faces is formed in the center of the rotating circular ring, the outer end of the sliding rod is connected in the threaded hole in a threaded mode, a locking nut in a regular polygon prism shape higher than the outer end face of the limiting block is arranged at the outer end, extending out of the threaded hole, of the sliding rod, and a fixing hole extending to the matching side face of the rotating circular ring is formed in the outer side face of the limiting block.
Because the outer end of the sliding rod is in threaded connection with the rotating circular ring, the sliding rod is fixed on the edge of the rotor, so that the connection and assembly of the wedge-shaped supporting block, the coil pressing block and the limiting ring with the sliding rod are facilitated, and the self-locking of the sliding rod and the rotating circular ring can be realized by the locking nut. Particularly, the locking nut is in a regular polygon prism shape higher than the outer end face of the limiting block, so that when the locking nut needs to be screwed down, a thin rod can be inserted into the fixing hole, and the rotating ring is limited in the circumferential direction relative to the rotating cavity. At the moment, the locking nut higher than the outer end face of the limiting block can be rotated by a wrench, so that the locking nut is conveniently installed or detached.
Preferably, both ends of the damping ring are provided with screw through holes, and the ends of the damping rings of two adjacent magnetic pole coils are detachably connected through screws arranged in the screw through holes.
The damping rings are detachably connected through screws, so that the assembly, disassembly and maintenance are facilitated, annular chains can be formed among the magnetic pole coils, small angle swing can be realized among the adjacent magnetic pole coils, and the magnetic pole coils can be conveniently and properly swung and adjusted when being installed on the edge of the rotor.
Preferably, a T-shaped groove extending in the vertical direction is provided at a position of the rotor edge corresponding to the connection portion, the connection portion includes a slide bar extending radially inward from the inner side surface of the pole coil into the T-shaped groove, and a slide block integrally provided at an inner end of the slide bar, and a radial gap is provided between the slide block and a bottom surface of the T-shaped groove.
The T-shaped slots extending in the up-down direction facilitate the lifting and connection of the pole coils from top to bottom to the rotor. Because the radial gap is formed between the sliding block and the bottom surface of the T-shaped groove, each magnetic pole coil can move slightly in the radial direction, so that the magnetic pole coils are favorably and neatly arranged at the edge of the rotor, the difficulty in installation caused by errors in manufacturing is avoided, and the coil pressing block driven by the wedge-shaped supporting block can ensure the reliable positioning of the magnetic pole coils.
Preferably, the two side surfaces of the pole coil are inclined from inside to outside towards the middle, so that the pole coil is in a trapezoid shape with a small outside and a large inside in a cross section perpendicular to the axis of the rotor.
Because the cross section of the magnetic pole coil is trapezoidal, when two sides of the magnetic pole coil are pressed tightly by the coil pressing block, a radial centripetal force can be formed, and the magnetic pole coil is effectively prevented from falling off outwards under the action of radial centrifugal force. Particularly, the included angle between the inclined planes on the two sides of the wedge-shaped supporting block can be reasonably designed, so that a self-locking angle is formed between the wedge-shaped supporting block and the coil pressing block, the wedge-shaped supporting block can be ensured to support the coil pressing block when moving outwards in the radial direction, the coil pressing block cannot push the wedge-shaped supporting block to move inwards in the radial direction when being subjected to lateral extrusion force, and the reliable positioning of the coil pressing block on the magnetic pole coil is ensured.
Preferably, a transverse T-shaped groove is formed in the outer end face of the coil pressing block, and a sliding strip which is connected in the T-shaped groove in a sliding mode is arranged on the inner end face, close to the coil pressing block, of the limiting block.
Because the radial position of the limiting block is relatively positioned with the rotor through the sliding rod, the coil pressing block is respectively in sliding connection with the wedge-shaped supporting block and the limiting block in two directions. When the wedge-shaped supporting block moves outwards, the wedge-shaped supporting block can slide relative to the coil pressing block and can drive the coil pressing block to move outwards along the side direction of the sliding strip, so that the pole coil is pressed. When the wedge-shaped supporting block moves inwards to reset under the driving of the resetting pressure spring, the coil pressing block can be driven to move inwards to reset along the side direction of the sliding strip. It can be understood that if the coil pressing block and the limiting block are separated from each other, the coil pressing block can synchronously move radially inwards along with the wedge-shaped supporting block, so that an assembly gap cannot be formed between the coil pressing block and the pole coil.
Preferably, the edges of two sides of the inner end face of the limiting block are provided with chamfers, so that two sliding inclined planes are formed, the outer end face of the coil pressing block is an inclined plane attached to the sliding inclined plane on the corresponding side, and the sliding strip is arranged on the sliding inclined plane.
According to the invention, two sliding inclined planes are arranged on the two side edges of the inner end surface of the limiting block, so that the coil pressing block can move along the inclined sliding inclined planes of the limiting block, and when the wedge-shaped supporting block moves in the radial direction, so that the coil pressing block is driven to move in the lateral direction, the friction resistance between the coil pressing block and the limiting block during the lateral movement can be obviously reduced.
Preferably, the included angle between the two side surfaces of the wedge-shaped supporting block is α, the included angle between the two sliding inclined surfaces is β, 6 degrees is larger than or equal to α degrees and smaller than or equal to 15 degrees, and 100 degrees is larger than or equal to β degrees and smaller than or equal to 120 degrees.
The invention can reduce the friction resistance between the wedge-shaped supporting block and the coil pressing block when the wedge-shaped supporting block moves radially and the friction resistance between the coil pressing block and the limiting block when the coil pressing block moves laterally by reasonably setting the included angle α between the two side surfaces of the wedge-shaped supporting block and the included angle β between the two sliding inclined surfaces of the limiting block, when α is less than 6 degrees, the lateral moving distance of the coil pressing block can be reduced when the wedge-shaped supporting block moves radially, so that the assembly gap between the coil pressing block and the magnetic pole coil is reduced, the assembly gap of the coil pressing block and the magnetic pole coil is not pressed in time, when α is more than 15 degrees, the friction force between the wedge-shaped supporting block and the coil pressing block when the wedge-shaped supporting block moves radially is overlarge, so that the lateral displacement of the coil pressing block is affected, and the assembly gap between the coil pressing block and the magnetic pole coil is reduced, when β is more than 120 degrees, the friction resistance between the coil pressing block and the magnetic pole coil pressing block is difficult to reduce effectively, and the phenomenon of the coil pressing block is easy to generate blocking phenomenon.
Therefore, the invention has the following beneficial effects: the reliable connection of the magnetic pole coil on the rotor can be ensured, the falling-off phenomenon is avoided, and the disassembly, assembly and maintenance of the magnetic pole coil can be facilitated.
Drawings
Fig. 1 is a schematic view of a structure of a rotor of the present invention.
Fig. 2 is a schematic view of a structure of the rotor at the connection of the pole coils.
Fig. 3 is a schematic structural view of the stop collar.
Fig. 4 is a schematic structural diagram of a limiting block.
Fig. 5 is a schematic view of another structure of the pole coil.
FIG. 6 is another schematic view of the stop collar.
In the figure: 1. the rotor 11, the inserting groove 2, the magnetic pole coil 21, the fixing clamping groove 22, the copper bar 23, the wire turn 24, the connecting portion 241, the sliding strip 242, the sliding block 25, the damping ring 3, the wedge-shaped supporting block 4, the sliding rod 5, the coil pressing block 51, the crimping surface 52, the sliding groove 6, the limiting ring 61, the limiting block 611, the rotating cavity 612, the mounting hole 613, the adjusting through hole 614, the fixing hole 615, the sliding strip 62, the rotating ring 621, the matching side surface 63, the locking nut 7 and the reset pressure spring.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
As shown in fig. 1 and 2, a magnetic pole fixing structure of a high-speed hydraulic turbine set comprises a rotor 1 with a vertical axis and capable of rotating in a horizontal plane, and a plurality of magnetic pole coils 2 arranged on the edge of the rotor and uniformly distributed at intervals in the circumferential direction, so that fixing slots 21 are formed between opposite side walls of two adjacent magnetic pole coils. Of course, as the hydro-turbine, a stator (not shown) is also required, and the rotor is disposed inside the stator.
The magnetic pole coils comprise a copper bar 22 and wire turns 23 wound on the copper bar, the inner end face of the copper bar is provided with a connecting part 24 connected with the rotor, the upper part of the outer end face of each magnetic pole coil is transversely provided with a damping ring 25, the end parts of the damping rings of two adjacent magnetic pole coils are detachably connected, the damping rings connected end to end enable the magnetic pole coils to be connected into an integrated chain-like structure in the circumferential direction, the radial centrifugal force generated when the magnetic pole coils rotate at a high speed can be effectively borne, the magnetic pole coils are prevented from being separated from the rotor due to the action of the centrifugal force, and meanwhile, when the magnetic pole coils are installed, small-angle swinging can be realized between the adjacent magnetic pole coils, so that the position of the magnetic pole. In addition, the edge of the rotor is provided with an insertion groove extending along the up-down direction, and the connecting part is inserted in the insertion groove 11 of the rotor, so that the magnetic pole coil can be conveniently installed on the rotor from top to bottom through hoisting.
In the present embodiment, the side closer to the rotor axis in the radial direction is referred to as an inner side, and the side closer to the stator is referred to as an outer side; in addition, for the magnetic pole coil, the copper bar is approximately rectangular, the axis of the copper bar is horizontally arranged transversely, so that an outer end face close to the stator, an inner end face close to the rotor and four connected side faces of the upper side, the lower side and the right side are formed, and the wire turns are wound on the side faces.
In order to ensure the reliable positioning of the magnetic pole coil during high-speed rotation and avoid the magnetic pole coil from being separated from the rotor due to the action of tangential centrifugal force, a wedge-shaped supporting block 3 is arranged in the middle of a fixed clamping groove, an upper sliding hole and a lower sliding hole which radially penetrate through the inner end and the outer end are formed in the wedge-shaped supporting block, a sliding rod 4 penetrates through the sliding hole, and the inner end of the sliding rod is fixed on the edge of the rotor, so that the wedge-shaped supporting block can radially move along the sliding rod. The left side and the right side of the wedge-shaped supporting block, which are close to the magnetic pole coil, are inclined planes inclined from inside to outside in the middle, so that the wedge-shaped supporting block is a wedge with a small outside and a large inside in a horizontal cross section perpendicular to the axis of the rotor, coil pressing blocks 5 are respectively arranged on two sides of the wedge-shaped supporting block, a radial sliding connection is formed between one side of each coil pressing block and the wedge-shaped supporting block through limiting sliding grooves, and the other side of each coil pressing block is a crimping surface 51 parallel to the side wall of the magnetic pole coil. In addition, the outer end of the sliding rod is provided with a limiting ring 6 attached to the coil pressing block, so that the coil pressing block is limited in the radial direction, and an assembly gap is formed between the pressing surface of the coil pressing block and the pole coil. Still the cover is equipped with reset pressure spring 7 on the slide bar, and reset pressure spring the inner supports and presses the outer terminal surface of wedge spacer, and reset pressure spring outer end supports and presses the spacing ring, still is equipped with spacing fender ring on the slide bar, and when reset pressure spring drive wedge spacer inwards removed, the wedge spacer supported and leans on spacing fender ring and fixes a position.
When the hydraulic turbine unit stops running due to the fact that the magnetic pole coils need to be updated and maintained, the magnetic pole coils are connected with the edge of the rotor in an inserting mode through the connecting portions, and the magnetic pole coils are connected into a whole in a serial mode in the circumferential direction through the damping rings connected end to end. Therefore, the damping ring on the outer side of the pole coil needing to be removed can be separated from the damping rings of the pole coils on two sides. Because the magnetic pole coil and the coil pressing blocks on the two sides are in a separated state and have assembly gaps, the magnetic pole coil can be conveniently lifted, so that the connecting part is separated from the insertion groove of the rotor, and the magnetic pole coil can be maintained. The repaired magnetic pole coil can be lifted above the rotor and gradually descended, the connecting part of the magnetic pole coil enters the corresponding insertion groove at the edge of the rotor, the insertion fit between the magnetic pole coil and the rotor is restored, and the damping rings at the outer side of the magnetic pole coil are detachably connected with the damping rings of the magnetic pole coils at the two sides.
When the hydraulic turbine set starts to run and the rotor rotates at a high speed, the wedge supporting block can be subjected to a great centrifugal force, so that the wedge supporting block moves outwards along the sliding rod in the radial direction, and the coil pressing block at the moment is limited by the limiting ring in the radial direction, so that the coil pressing blocks at two sides can be squeezed open towards two sides by the inclined planes at two sides of the wedge supporting block, the compression joint surface of the coil pressing block can be tightly attached to the side surface of the magnetic pole coil, so that each magnetic pole coil is tightly connected into a whole, and the magnetic pole coil is prevented from deflecting when being started and rotating at a high speed.
When the hydraulic turbine is stopped and the rotor is decelerated to stop rotation, the centrifugal force of the wedge supporting block is reduced to zero, the reset pressure spring drives the wedge supporting block to move inwards to reset along the sliding rod, correspondingly, the coil pressing blocks on the two sides of the wedge supporting block are drawn close to each other, the pressing surface of the coil pressing block is separated from the side surface of the magnetic pole coil, and therefore the magnetic pole coil needing to be updated and maintained is conveniently dismounted on the premise that the whole rotor is not hoisted.
That is to say, the wedge-shaped supporting block can enable each magnetic pole coil to be mutually propped and extruded together through the wedge-shaped supporting block and the coil pressing block when the rotor of the water turbine rotates at a high speed, so that the magnetic pole coil is in a 'compaction' state, and deflection and even throwing away of the magnetic pole coil from the rotor are avoided; when the magnetic pole coil needs to be disassembled and assembled and the rotor of the water turbine stops rotating, the magnetic pole coil is automatically separated from the coil pressing blocks on the two sides, and the magnetic pole coil is in a loose state at the moment, so that the magnetic pole coil is convenient to disassemble, assemble and maintain.
As a preferable scheme, as shown in fig. 3 and 4, the limiting ring includes a rectangular parallelepiped limiting block 61, a rotating cavity 611 is disposed inside the limiting block, an inner side wall of the rotating cavity is a spherical surface, and a center of the rotating cavity is located at a center of the limiting block. A rotating ring 62 is arranged in the rotating cavity and comprises two circular end faces and a matching side face 621 connected between the outer edges of the two end faces, wherein the matching side face is a convex spherical face with a spherical center positioned at the center of the rotating ring and matched with the rotating cavity. Of course, a connecting through hole penetrating through the two end faces can be arranged in the middle of the rotating ring, and the axis of the connecting through hole penetrates through the spherical center of the matching side face.
In addition, a rectangular mounting hole 612 extending inwards to the spherical center of the rotating cavity is arranged at the center of the outer end face of the limiting block, which is far away from the magnetic pole coil, so that the mounting hole is provided with two opposite width side walls and two opposite length side walls. Two opposite width side walls of the mounting hole are tangent to the rotating cavity, so that the length of the mounting hole is equal to the diameter of the rotating cavity, and the outer end of the sliding rod is connected to the connecting through hole in the center of the rotating ring.
During assembly, the axis of the rotating ring can be perpendicular to the axis of the limiting block mounting hole, then the rotating ring is placed into the outer end of the rectangular mounting hole until the spherical center of the matching side face of the rotating ring is coincided with the spherical center of the rotating cavity, then the rotating ring is rotated by 90 degrees, the axis of the rotating ring is basically coincided with the axis of the limiting block mounting hole, the matching side face of the rotating ring is attached to the rotating cavity, and therefore spherical surface rotating matching is formed between the rotating ring and the rotating cavity. Then, the inner end of the sliding rod is connected with the edge of the rotor, the wedge-shaped supporting block and the reset pressure spring are sequentially sleeved at the outer end of the sliding rod, the outer end of the sliding rod is connected to the connecting through hole of the rotating circular ring, and the limiting block limits the coil pressing blocks on two sides in the radial direction so as to prevent the rotating circular ring from being separated from the rotating cavity of the limiting block. Because the stopper can rotate the 360 degrees omnidirectional swings of ring and the outer end of slide bar relatively, therefore can ensure that the medial surface of stopper pastes the coil briquetting that leans on wedge bracer both sides simultaneously balancedly, makes the atress between the coil briquetting of wedge bracer both sides and the spacing briquetting balanced, and then ensures that the crimping face of coil briquetting is balanced to the effort of magnetic pole coil.
It will be appreciated that the width of the mounting hole is preferably not less than the thickness of the rotating ring, and preferably the thickness of the rotating ring is adapted to the width of the mounting hole, so that the rotating ring can be placed in the mounting hole. Because the rotating cavity of the rotating ring and the rotating cavity of the limiting block form spherical surface matching, the rotating ring can be prevented from being separated from the limiting block, so that the sliding rod can apply radial centripetal force to the limiting block through the rotating ring, and the inner side of the limiting block can play a role in radially limiting the coil pressing blocks on two sides.
In addition, when the thickness of the limiting block is larger than the diameter of the rotating cavity, the whole rotating cavity is located inside the limiting block, and at the moment, an adjusting through hole which penetrates through the outer end face and is larger than the diameter of the sliding rod can be formed in the center of the inner end face of the limiting block, so that the sliding rod is connected to the rotating ring through the adjusting through hole. Preferably, the thickness of the stopper is smaller than the diameter of the rotation chamber, so that the rotation chamber penetrates both end surfaces of the stopper to form an adjustment through hole 613 having a diameter larger than the diameter of the sliding rod, so that the sliding rod is connected to the rotation ring through the adjustment through hole.
Preferably, the connecting through hole at the center of the rotating ring can form a threaded hole penetrating through two end faces, the outer end of the sliding rod is in threaded connection with the threaded hole, a locking nut 63 in a regular polygon prism shape is arranged at the outer end of the sliding rod, which extends out of the threaded hole, and the end face of the locking screw rod is higher than the outer end face of the limiting block. When the rotary ring is in threaded connection with the sliding rod, the locking nut can be connected to the outer end of the sliding rod, and the locking nut is screwed down by a wrench, so that the self-locking of the sliding rod and the rotary ring is realized. In order to avoid the rotation of the rotating ring when the locking nut is tightened, a fixing hole 614 extending inwards to the matching side surface of the rotating ring can be arranged on the outer side surface of the limiting block, that is, a blind hole-shaped fixing hole is also formed on the matching side surface. When the locking nut needs to be screwed down, a thin rod can be inserted into the fixing hole, so that the rotating ring is limited in the circumferential direction relative to the rotating cavity.
As another preferred scheme, screw through holes may be provided at both ends of the damping ring, and the ends of the damping rings of two adjacent pole coils are detachably connected by screws provided in the screw through holes. That is to say, when two magnetic pole coils need to be connected, the screw through holes at the end parts of the damping rings can be overlapped, then the screws penetrate through the overlapped screw through holes, and then the screws are fixed by nuts. Preferably, one side of the damping ring can be bent to be step-shaped. When the ends of the adjacent damping rings need to be overlapped, the end of one damping ring is overlapped at the step of the other damping ring, and the screw through hole is arranged at the step, so that the staggered overlapping between the ends of the damping rings is facilitated.
In order to facilitate the connection between the magnetic pole coil and the rotor, the insertion grooves disposed at the edge of the rotor corresponding to the connection portions are 3T-shaped grooves extending in the vertical direction, the 3T-shaped grooves are arranged side by side at intervals, and the connection portions include 3 sliding bars 241 extending radially inward from the inner side of the magnetic pole coil into the T-shaped grooves and sliding blocks 242 integrally disposed at the inner ends of the sliding bars, so that the magnetic pole coil and the rotor form an insertion fit in the vertical direction. In addition, a radial gap is reserved between the sliding block and the bottom surface of the T-shaped groove, so that the sliding strip and the sliding block can radially displace in the T-shaped groove, the magnetic pole coils can be conveniently assembled at the edge of the rotor, the magnetic pole coils can be connected in series in the circumferential direction through radial displacement, and the adverse effect of manufacturing errors such as size on the assembly of the magnetic pole coils is eliminated.
In order to reliably position the magnetic pole coil in the radial direction, as shown in fig. 5, the upper, lower, left and right side surfaces of the copper bar of the magnetic pole coil are inclined from inside to outside, so that the copper bar is in a quadrangular frustum shape, and the four side surfaces are provided with wire grooves, so that wire turns are reliably wound on the copper bar, and the magnetic pole coil is in a trapezoid shape with a small outside and a large inside in the cross section perpendicular to the axis of the rotor. That is, the left and right side surfaces of the pole coil are inclined from inside to outside toward the center, and the crimping surface of the coil holder is still parallel to the inclined side surface of the pole coil.
When the wedge-shaped supporting block moves outwards in the radial direction and the inclined planes on the two sides of the magnetic pole coil are pressed tightly by the coil pressing block, a radial centripetal force can be formed, so that the magnetic pole coil is effectively prevented from falling off outwards under the action of a radial centrifugal force.
Particularly, an included angle α between two side inclined planes of the wedge-shaped supporting block can be set within a range of 6- α -15 degrees, so that a self-locking angle is formed between the wedge-shaped supporting block and the coil pressing block, and sufficient friction resistance is formed between the coil pressing block and the wedge-shaped supporting block when the coil pressing block receives lateral reaction force of the magnetic pole coil, so that the coil pressing block is prevented from pushing the wedge-shaped supporting block to move radially inwards, the reliable positioning of the magnetic pole coil by the coil pressing block is further ensured, and the wedge-shaped supporting block can easily prop open the coil pressing block and press the magnetic pole coil when moving radially outwards.
In order to facilitate lateral movement of the coil pressing blocks, a transverse T-shaped groove can be formed in the outer end face of each coil pressing block, a sliding strip 615 which is connected in the T-shaped groove in a sliding mode is arranged on the inner end face, close to the coil pressing blocks, of each limiting block, therefore the limiting blocks are connected with the two coil pressing blocks in a sliding mode, and the T-shaped grooves formed in the outer end faces of the coil pressing blocks form the sliding grooves 52. When the wedge-shaped supporting block moves outwards, the wedge-shaped supporting block can slide relative to the coil pressing block and can drive the coil pressing block to move outwards along the side direction of the sliding strip, so that the pole coil is pressed. When the wedge supporting block is driven by the reset pressure spring to move inwards for resetting, the coil pressing block can be driven to move inwards for resetting along the side direction of the slide bar, the coil pressing block is prevented from moving inwards and radially synchronously along with the wedge supporting block, the automatic resetting of the coil pressing block when the hydraulic turbine unit is stopped is ensured, and then an assembly gap is formed between the coil pressing block and the magnetic pole coil.
Preferably, chamfers are arranged on the left and right edges of the inner end face of the limiting block, so that two sliding inclined planes 616 are formed, the outer end face of the coil pressing block is an inclined plane attached to the sliding inclined plane on the corresponding side, and the sliding strip which is connected with the coil pressing block in a sliding mode on the limiting block is arranged on the sliding inclined plane on the corresponding side. When the wedge-shaped supporting block moves in the radial direction, so that the coil pressing block is driven to move laterally, the friction resistance between the coil pressing block and the limiting block during lateral movement can be obviously reduced.
An included angle β between the two sliding inclined planes can be controlled within a range of 100 degrees to β degrees to 120 degrees, frictional resistance between the coil pressing block and a limiting block during lateral movement is reduced, and excessive radial displacement of the coil pressing block during lateral movement is effectively avoided on the premise that the phenomenon that the coil pressing block is clamped is avoided.
Claims (9)
1. A magnetic pole fixing structure of a high-speed hydraulic turbine set comprises a rotor with a vertical axis and a plurality of magnetic pole coils arranged at the edge of the rotor, and is characterized in that the magnetic pole coils comprise connecting parts at the inner side and damping rings transversely arranged at the upper part of the outer side, the end parts of the damping rings of two adjacent magnetic pole coils form detachable connection, the connecting parts are inserted at the edge of the rotor along the up-down direction, a fixing clamping groove is formed between the opposite side walls of the two adjacent magnetic pole coils, a wedge-shaped supporting block is arranged in the middle of the fixing clamping groove, a sliding hole penetrating through the inner end and the outer end along the radial direction is arranged in the wedge-shaped supporting block, a sliding rod is arranged in the sliding hole, the inner end of the sliding rod is fixed at the edge of the rotor, two side surfaces of the wedge-shaped supporting block, which are close to the magnetic pole coils, be equipped with the coil briquetting respectively in the both sides of wedge braced block, form radial sliding connection through spacing spout between coil briquetting one side and the wedge braced block, the opposite side of coil briquetting is the crimping face parallel with the magnetic pole coil lateral wall, is equipped with the fit-up gap between crimping face and magnetic pole coil, and the outer end of slide bar is equipped with the spacing ring that pastes and leans on the coil briquetting, and the cover is equipped with the pressure spring that resets on the slide bar, and pressure wedge braced block outer end is supported to pressure spring one end that resets, and the other end supports presses the spacing.
2. The magnetic pole fixing structure of the high-speed hydraulic turbine unit as claimed in claim 1, wherein the limiting ring comprises a rectangular parallelepiped limiting block, a rotating cavity is arranged in the limiting block, the rotating cavity is a spherical surface, the spherical center of the rotating cavity is positioned at the center of the limiting block, a rotating ring is arranged in the rotating cavity and comprises two end faces and a matching side face connected between the two end faces, the matching side surface is a convex spherical surface with the spherical center positioned at the center of the rotating circular ring and matched with the rotating cavity, a rectangular mounting hole which extends inwards to the spherical center of the rotating cavity is arranged at the center of the outer end surface of the limiting block far away from the magnetic pole coil, an adjusting through hole penetrating through the outer end face is formed in the center of the inner end face of the limiting block, the width of the mounting hole is not smaller than the thickness of the rotating ring, two opposite width side walls of the mounting hole are tangent to the rotating cavity, and the outer end of the sliding rod is connected to the center of the rotating ring.
3. The magnetic pole fixing structure of a high-speed hydraulic turbine unit as claimed in claim 2, wherein the center of the rotating ring is provided with a threaded hole penetrating through both end faces, the outer end of the sliding rod is screwed in the threaded hole, the outer end of the sliding rod extending out of the threaded hole is provided with a regular polygonal column-shaped lock nut higher than the outer end face of the stopper, and the outer side face of the stopper is provided with a fixing hole extending to the mating side face of the rotating ring.
4. The magnetic pole fixing structure of a high-speed hydraulic turbine unit as claimed in claim 1, wherein the damping rings have screw through holes at both ends thereof, and the ends of the damping rings of two adjacent magnetic pole coils are detachably connected to each other by screws disposed in the screw through holes.
5. The structure of claim 1, wherein a T-shaped groove extending in the up-down direction is formed at a position of the rotor edge corresponding to the connection portion, the connection portion includes a slide bar extending radially inward from the inner side surface of the pole coil into the T-shaped groove, a slide block integrally provided at an inner end of the slide bar, and a radial gap is formed between the slide block and a bottom surface of the T-shaped groove.
6. The pole fixing structure of a high-speed water turbine unit as claimed in claim 1, wherein the two side surfaces of the pole coil are inclined from inside to outside toward the middle, so that the pole coil has a trapezoidal shape with a smaller outside and a larger inside in a cross section perpendicular to the axis of the rotor.
7. The structure of claim 2, wherein the outer end surface of the coil block is provided with a transverse T-shaped groove, and the inner end surface of the limiting block close to the coil block is provided with a slide bar slidably connected in the T-shaped groove.
8. The structure of claim 7, wherein the two side edges of the inner end surface of the limiting block are chamfered to form two sliding slopes, the outer end surface of the coil pressing block is an inclined surface abutting against the sliding slope on the corresponding side, and the sliding strip is disposed on the sliding slope.
9. The magnetic pole fixing structure of a high-speed hydraulic turbine unit as claimed in claim 8, wherein the included angle between the two side faces of the wedge-shaped supporting block is α, the included angle between the two sliding inclined faces is β, and 6 ° α ° to 15 °, 100 ° to β ° to 120 °.
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| CN202010074124.XA CN111262366B (en) | 2020-01-22 | 2020-01-22 | Magnetic pole fixing structure of high-speed hydraulic turbine unit |
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| CN202010074124.XA CN111262366B (en) | 2020-01-22 | 2020-01-22 | Magnetic pole fixing structure of high-speed hydraulic turbine unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111828664A (en) * | 2020-06-24 | 2020-10-27 | 浙江富春江水电设备有限公司 | Cutoff valve convenient for hydraulic transition and control for tubular turbine |
| CN113847324A (en) * | 2021-09-22 | 2021-12-28 | 嘉兴圣龙五金科技股份有限公司 | Anti-loosening bolt for bridge |
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| CN111262366B (en) | 2021-01-01 |
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