New connection structure applicable to the rotor poles and yoke of a bulb-type hydrogenerator

Abstract

The present invention belongs to the technical field of the manufacture of hydro-generators, and provides a novel connection structure applicable to the rotor poles and the yoke of a bulb-type hydro-generator, comprising: poles, a connection mechanism, a yoke and a self-locking tensioning mechanism. A dovetail protrusion is provided on the pole, and a dovetail chute is provided on the yoke. The dovetail protrusion cooperates with the dovetail chute, one side of the dovetail protrusion is in contact with one side of the dovetail chute, and a gap is provided between the other side of the dovetail protrusion and the other side of the dovetail chute. The self-locking tensioning mechanism is arranged in the gap formed by the sides of the dovetail protrusion and the dovetail chute. The pole is connected to the yoke through the connection mechanism, solving the problems that the connection between the pole and the yoke is unstable, the pole key cannot be effectively prevented from loosening and failing, there are huge potential safety hazards, and the service life of the equipment is low, and having the effects of convenient and quick installation, stable connection, reduction of potential safety hazards and extension of the service life of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing hydro-generators, and particularly to a novel connection structure applicable to the rotor poles and yoke of a bulb-type hydro-generator. Background Art

[0002] The fixing method of the rotor poles and yoke of a hydro-generator should be determined according to factors such as the capacity of the generator, the strength requirements of the poles for the runaway speed, and the processing equipment conditions of the manufacturer.

[0003] In fact, regarding the specific connection and fixing methods of the poles, the structural designs adopted by each manufacturer are not exactly the same. Currently, the traditional connection method mostly uses a T-tail, and the poles are fixed by means of a stop block, gasket, wedge block and bolt tightening. For small and medium-sized bulb tubular hydro-generators without yoke laminations, the rotor poles are fixed to the yoke ring by tension bolts. However, for large-capacity bulb tubular hydro-generators (with an outer diameter of stator punching sheets above 7560 mm, a core length above 1400 mm, and a rated capacity above 35,000 KVA), due to the adoption of a yoke lamination structure similar to that of vertical units, a pole core structure without pole clamping plates, and special-shaped dove tails for pole punching sheets, the connection and fixing method of the rotor poles and yoke shows certain particularity.

[0004] The State Intellectual Property Office publicly disclosed a patent for invention with the publication number CN207426840U and the name "A fixing structure for poles and yoke" on November 08, 2017. The following content is included in the specification of this patent for invention: "Two groups of pole keys are symmetrically arranged between the working surface and the stress surface of the pole. In the present invention, the length of the pole key is longer than the axial length of the pole. Among them, the pole key includes a main key and a sub-key, both of which are wedge-shaped structures. The contact surface between the main key and the sub-key is an inclined surface, the contact surface between the main key and the working surface of the pole is a plane, and the contact surface between the sub-key and the stress surface is a plane."

[0005] As can be seen from the above, most of the existing technologies use the method of arranging pole keys between the poles and the yoke to connect and fix the poles and the yoke, and most of the existing pole keys are wedge-shaped structures. The tightening effect is achieved by squeezing the pole key along the inclined surface. However, in practice, the poles and the yoke will generate a huge reaction force on the pole key. Due to the huge reaction force, when the fixed part is damaged and fails, the pole key moves in the reverse direction under the reaction force, resulting in the loosening of the poles and the yoke, causing a huge potential safety hazard.

[0006] The existing technology has problems such as unstable connection between the poles and the yoke, inability to effectively prevent the pole key from loosening and failing, having a huge potential safety hazard, and low service life of the equipment. Summary of the Invention

[0007] To solve the above technical problems, the present invention relates to a novel connection structure applicable to the rotor poles and the yoke of a bulb-type hydrogenerator.

[0008] A novel connection structure applicable to the rotor poles and the yoke of a bulb-type hydrogenerator, comprising: a pole, a connection mechanism, a yoke, and a self-locking tensioning mechanism. A dovetail protrusion is provided on the pole, and a dovetail chute is provided on the yoke. The dovetail protrusion cooperates with the dovetail chute. One side of the dovetail protrusion is in contact with one side of the dovetail chute, and a gap is provided between the other side of the dovetail protrusion and the other side of the dovetail chute. The self-locking tensioning mechanism is arranged in the gap formed by the sides of the dovetail protrusion and the dovetail chute, and the pole is connected to the yoke through the connection mechanism.

[0009] Further, the self-locking tensioning mechanism comprises: a main tooth plate and a sub-tooth plate. The inclined surfaces of the main tooth plate and the sub-tooth plate are in contact and cooperate with each other. The flat surface of the main tooth plate is in contact with the yoke, and the flat surface of the sub-tooth plate is in contact with the pole.

[0010] Further, the main tooth plate comprises: a self-locking pin, a spring, a weight pressing block, an internal baffle, a stepped through-hole, and a baffle hole. The main tooth plate is provided with a stepped through-hole and a baffle hole. The self-locking pin, the spring, and the weight pressing block are arranged in the stepped through-hole. One end of the self-locking pin is in contact with one end of the spring, and the other end of the spring is in contact with the weight pressing block. The internal baffle is arranged in the baffle hole and is fixed to the narrow end of the main tooth plate by screws. The weight pressing block is located above the internal baffle. A self-locking hole is provided on the sub-tooth plate. The other end of the self-locking pin is an inclined surface and cooperates with the self-locking hole. The inclined surface of the self-locking pin has the same inclination direction as the inclined surface of the main tooth plate. The self-locking pin, the stepped through-hole, the internal baffle, and the baffle hole are all square.

[0011] Further, the connection mechanism comprises: a fixing mechanism and a pressing mechanism. The yoke is provided with a fixing mechanism, and the fixing mechanism is located on the upstream side. The yoke is provided with a pressing mechanism, and the pressing mechanism is located on the downstream side. The pressing mechanism connects the pole and the yoke.

[0012] Further, the fixing mechanism comprises: a support block and a telescopic bolt. The yoke is provided with a support block, and the support block is located on the upstream side. A first telescopic bolt is provided on the support block, and the telescopic bolt presses the pole.

[0013] Further, the pressing mechanism comprises: a pressing plate and a second telescopic bolt. The yoke is provided with a pressing plate, and the pressing plate is located on the downstream side. The pressing plate connects the pole and the yoke. A second telescopic bolt is provided on the pressing plate, and the second telescopic bolt presses the sub-tooth plate.

[0014] Further, a convex platform is provided on the self-locking pin, and a retaining platform is provided in the stepped through-hole. The convex platform cooperates with the retaining platform.

[0015] The beneficial effects of the present invention are:

[0016] The present invention provides a novel connection structure applicable to the rotor poles and the yoke of a bulb-type hydrogenerator. A serrated pole key structure is adopted to form a form of spacer block with adjustable thickness, making the pole assembly simple and flexible and facilitating the installation in power stations. A novel self-locking structure is adopted to prevent the pole key from being damaged and loosened at the connection part or loosening under the huge reaction force between the pole and the yoke, and can maintain a stable fastening effect on the pole and the yoke, having the effects of convenient and fast installation, stable and firm connection, reducing potential safety hazards, and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic diagram of the downstream side structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the upstream side structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the partial structure of the dovetail protrusion and the dovetail groove of the present invention;

[0021] Figure 4 It is a schematic diagram of the pole key structure of the present invention;

[0022] Figure 5 is Figure 4 a partial enlarged schematic diagram of part A in;

[0023] Figure 6 is Figure 4 a partial enlarged schematic diagram of part B in;

[0024] Figure 7 is Figure 4 a partial enlarged schematic diagram of part C in;

[0025] Figure 8 It is a schematic diagram of the partial structure of the fixing mechanism in the present invention;

[0026] Figure 9 It is a schematic diagram of the partial structure of the jacking mechanism in the present invention;

[0027] Wherein:

[0028] 1. Pole; 2. Connection mechanism; 3. Yoke;

[0029] 4. Self-locking tensioning mechanism; 11. Dovetail protrusion; 21. Fixing mechanism;

[0030] 22. Tightening mechanism; 31. Dovetail chute; 41. Main tooth plate;

[0031] 42. Sub-tooth plate; 211. Support block; 212. First telescopic bolt

[0032] 221. Pressure plate; 222. Second telescopic bolt; 411. Self-locking pin;

[0033] 412. Spring; 413. Counterweight pressing block; 414. Built-in baffle;

[0034] 415. Step through hole; 416. Baffle hole; 417. Boss;

[0035] 418. Stopping platform; 421. Self-locking hole. Detailed implementation mode

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0037] It should be noted that the installation methods and technical terms mentioned in the present invention are all technical terms that have been clearly known in the technical field to which they belong, so no further explanation will be given. In addition, the same reference numerals are used for the same components, but this does not affect and should not constitute an accurate understanding of the technical solutions by those skilled in the art.

[0038] Embodiment 1:

[0039] The present invention relates to a new connection structure applicable to the rotor pole and yoke of a bulb-type hydrogenerator, including: pole 1, connection mechanism 2, yoke 3, and self-locking tensioning mechanism 4. A dovetail protrusion 11 is provided on the pole 1, and a dovetail chute 31 is provided on the yoke 3. The dovetail protrusion 11 cooperates with the dovetail chute 31. One side of the dovetail protrusion 11 is in contact with one side of the dovetail chute 31, and a gap is provided between the other side of the dovetail protrusion 11 and the other side of the dovetail chute 31. The self-locking tensioning mechanism 4 is arranged in the gap formed by the side surfaces of the dovetail protrusion and the dovetail chute 31, and the pole 1 is connected to the yoke 3 through the connection mechanism 2.

[0040] The self-locking tensioning mechanism 4 includes: main tooth plate 41 and sub-tooth plate 42. The inclined surfaces of the main tooth plate 41 and the sub-tooth plate 42 are in contact and cooperate with each other. The plane of the main tooth plate 41 is in contact with the yoke 3, and the plane of the sub-tooth plate 42 is in contact with the pole 1.

[0041] The main tooth plate 41 includes: a self-locking pin 411, a spring 412, a counterweight pressing block 413, an internal baffle 414, a stepped through hole 415 and a baffle hole 416. The main tooth plate 41 is provided with the stepped through hole 415 and the baffle hole 416. The self-locking pin 411, the spring 412 and the counterweight pressing block 413 are arranged in the stepped through hole 415. One end of the self-locking pin 411 contacts with one end of the spring 412, and the other end of the spring 412 contacts with the counterweight pressing block 413. The internal baffle 414 is arranged in the baffle hole 416 and is fixed to the narrow end of the main tooth plate 41 by screws. The counterweight pressing block 413 is located above the internal baffle 414. The auxiliary tooth plate 42 is provided with a self-locking hole 421. The other end of the self-locking pin 411 is a bevel surface and is matched with the self-locking hole 421. The bevel surface of the self-locking pin 411 has the same inclination direction as the bevel surface of the main tooth plate 41. The self-locking pin 411, the stepped through hole 415, the internal baffle 414 and the baffle hole 416 are all square, so that the bevel surface of the self-locking pin 411 has the same inclination direction as the bevel surface of the main tooth plate 41 and will not rotate.

[0042] The connecting mechanism 2 includes: a fixing mechanism 21 and a pressing mechanism 22. The fixing mechanism 21 is arranged on the yoke 3 and is located on the upstream side. The pressing mechanism 22 is arranged on the yoke 3 and is located on the downstream side. The pressing mechanism 22 connects the magnetic pole 1 and the yoke 3.

[0043] The fixing mechanism 21 includes: a supporting block 211 and a telescopic bolt 212. The supporting block 211 is arranged on the yoke 3 and is located on the upstream side. The supporting block 211 is fixed to the yoke 3 by screws and is firmly spot-welded to form a non-detachable structure. The supporting block 211 blocks the main tooth plate 41. The first telescopic bolt 212 is arranged on the supporting block 211. The first telescopic bolt 212 presses the magnetic pole 1. The first telescopic bolt 212 is used to adjust and hold the magnetic pole 1. A round hole is machined at a suitable position on the supporting block 211 for disassembling the main tooth plate 41 and the auxiliary tooth plate 42.

[0044] The pressing mechanism 22 includes: a pressing plate 221 and a second telescopic bolt 222. The pressing plate 221 is arranged on the yoke 3 and is located on the downstream side. The pressing plate 221 connects the magnetic pole 1 and the yoke 3. The pressing plate 221 is fixed to the magnetic pole 1 and the yoke 3 by screws to form a detachable structure. The second telescopic bolt 222 is arranged on the pressing plate 221. The second telescopic bolt 222 presses the auxiliary tooth plate 42. By screwing the second telescopic bolt 222 to make the second telescopic bolt 222 extend, the auxiliary tooth plate 42 is pressed to firmly connect the magnetic pole 1 and the yoke 3. The second telescopic bolt 222 is used to adjust and press the auxiliary tooth plate 42.

[0045] A boss 417 is provided on the self-locking pin 411, and a retaining step 418 is provided in the stepped through-hole 415. The boss 417 cooperates with the retaining step 418. When the boss 417 cooperates with the retaining step 418, point a on the inclined surface of the self-locking pin 411 is located in the self-locking hole 421, and point b on the inclined surface of the self-locking pin 411 is not higher than the inclined surface of the main tooth plate 41.

[0046] Such a setting solves the problems that the connection between the magnetic pole and the yoke is unstable, the magnetic pole key cannot be effectively prevented from loosening and failing, there are huge potential safety hazards, and the service life of the equipment is low. The serrated magnetic pole key structure is adopted to form a form of shim with adjustable thickness, making the assembly of the magnetic pole simple and flexible, and facilitating the installation of the power station. A new type of self-locking structure is adopted to prevent the magnetic pole key from being damaged and loosened at the connection part or loosening under the huge reaction force between the magnetic pole and the yoke, and can maintain a stable fastening effect on the magnetic pole and the yoke, with the effects of convenient and fast installation, stable and firm connection, reducing potential safety hazards, and extending the service life of the equipment.

[0047] Working principle:

[0048] During installation, the self-locking pin 411, the spring 412, and the counterweight pressing block 413 are installed in the stepped through-hole 415 in sequence, inverted so that the counterweight pressing block 413 presses the spring 412 and the built-in baffle 414 is installed in the baffle hole 416 to block the counterweight pressing block 413. Then the built-in baffle 414 is fixed to the yoke 3 by screws. The assembled main tooth plate 41 and the sub-tooth plate 42 are installed in the gap formed by the side surfaces of the dovetail protrusion 11 and the dovetail groove 31. The sub-tooth plate 42 is adjusted and tightened by the second telescopic bolt 222. The sub-tooth plate 42 and the main tooth plate 41 cooperate to firmly connect the magnetic pole 1 and the yoke 3. During the process of tightening the sub-tooth plate 42, the self-locking pin 411 extends into the self-locking hole 421 to prevent the magnetic pole key from moving in the reverse direction, achieving a self-locking effect.

[0049] During disassembly, first remove the built-in baffle 414, and the self-locking pin 411, the spring 412, and the counterweight pressing block 413 fall. The self-locking pin 411 disengages from the self-locking hole 421. Remove the pressing plate 221 on the downstream side, and then strike the sub-tooth plate 42 through the round hole on the support block 211 from the upstream side to loosen the contact surface between the main tooth plate 41 and the sub-tooth plate 42, so as to remove the rotor magnetic pole.

[0050] For those skilled in the art, the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0051] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any minor modifications, equivalent replacements, and improvements made to the above embodiments based on the technical essence of the present invention shall be included within the protection scope of the technical solution of the present invention.

Claims

1. A novel connection structure applicable to the rotor poles and the yoke of a bulb-type hydrogenerator, characterized in that, it includes: a pole (1), a connection mechanism (2), a yoke (3) and a self-locking tensioning mechanism (4). A dovetail protrusion (11) is provided on the pole (1), and a dovetail chute (31) is provided on the yoke (3). The dovetail protrusion (11) cooperates with the dovetail chute (31). One side of the dovetail protrusion (11) is in contact with one side of the dovetail chute (31), and a gap is provided between the other side of the dovetail protrusion (11) and the other side of the dovetail chute (31). The self-locking tensioning mechanism (4) is arranged in the gap formed by the sides of the dovetail protrusion and the dovetail chute (31). The pole (1) is connected to the yoke (3) through the connection mechanism (2); The self-locking tensioning mechanism (4) includes: a main tooth plate (41) and a sub-tooth plate (42). The inclined surfaces of the main tooth plate (41) and the sub-tooth plate (42) are in contact and cooperate with each other. The plane of the main tooth plate (41) is in contact with the yoke (3), and the plane of the sub-tooth plate (42) is in contact with the pole (1); The main tooth plate (41) includes: a self-locking pin (411), a spring (412), a weight pressing block (413), an internal baffle (414), a stepped through hole (415) and a baffle hole (416). The main tooth plate (41) is provided with a stepped through hole (415) and a baffle hole (416). A self-locking pin (411), a spring (412) and a weight pressing block (413) are arranged in the stepped through hole (415). One end of the self-locking pin (411) is in contact with one end of the spring (412), and the other end of the spring (412) is in contact with the weight pressing block (413). The internal baffle (414) is arranged in the baffle hole (416) and is fixed to the narrow end of the main tooth plate (41) by screws. The weight pressing block (413) is located above the internal baffle (414). A self-locking hole (421) is provided on the sub-tooth plate (42). The other end of the self-locking pin (411) is an inclined surface and cooperates with the self-locking hole (421). The inclined surface of the self-locking pin (411) is in the same inclination direction as the inclined surface of the main tooth plate (41). The self-locking pin (411), the stepped through hole (415), the internal baffle (414) and the baffle hole (416) are all square; The connection mechanism (2) includes: a fixing mechanism (21) and a pressing mechanism (22). A fixing mechanism (21) is provided on the yoke (3), and the fixing mechanism (21) is located on the upstream side. A pressing mechanism (22) is provided on the yoke (3), and the pressing mechanism (22) is located on the downstream side. The pressing mechanism (22) connects the pole (1) and the yoke (3); The fixing mechanism (21) includes: a supporting block (211) and a telescopic bolt (212). A supporting block (211) is provided on the yoke (3), and the supporting block (211) is located on the upstream side. A first telescopic bolt (212) is provided on the supporting block (211), and the first telescopic bolt (212) presses the pole (1); The jacking mechanism (22) includes a pressure plate (221) and a second telescopic bolt (222). The pressure plate (221) is arranged on the yoke (3). The pressure plate (221) is located on the downstream side. The pressure plate (221) connects the magnetic pole (1) and the yoke (3). The second telescopic bolt (222) is arranged on the pressure plate (221), and the second telescopic bolt (222) presses the sub-tooth plate (42).

2. The novel connection structure for the rotor magnetic pole and the yoke of a bulb-type hydrogenerator according to claim 1, characterized in that, a boss (417) is arranged on the self-locking pin (411), and a retaining table (418) is arranged in the stepped through-hole (415), and the boss (417) cooperates with the retaining table (418).

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