CN208904795U - A kind of ripple spring washer form involute position Tensioning structure - Google Patents

Abstract

The utility model discloses a kind of ripple spring washer form involute position Tensioning structure, by lower laminated plank (1), the conformal pad (2) of lower layer, the conformal pad (3) in upper layer, upper laminated plank (4), ripple spring washer (5), cover board (6), bandage (7) is constituted, the utility model can be applied to the reforming processing of non-compliant generator stator end, the elastic acting force put aside using ripple spring washer, binding structure is set to form tensioned state, reinforce generator stator end involute position itself overall stiffness obviously, it substantially change turbine generator stator end elliptical vibration frequency, reach and avoids sensitive frequency range, guarantee the purpose of generator operational safety.

Description

A kind of ripple spring washer form involute position Tensioning structure

Technical field:

The utility model relates to a kind of ripple spring washer form involute position Tensioning structures.

Background technique:

Full speed steam turbine generator stock utilization is high, and mechanical oscillation and the operation of ventilating and cooling issue concerns to generator are pacified Entirely, stator end mode and the intrinsic frequency of lead have a significant impact to the safe operation of generator, and generator unit stator is being run It in the process will be by ellipse 100Hz electromagnetic force, if stator end ellipse Modal frequency is equal or close to 100Hz, and when vibratory response is bigger, stator end is possible to resonate, and leads to entire winding overhang worn loose, line Stick mechanical fatigue, the safe operation for causing major accident hidden danger, endangering unit.Therefore, generator design should make stator terminal as far as possible Portion's entirety ellipse intrinsic frequency avoids 100Hz proper range, but current vibration analysis means can not still accurately calculate stator End portion vibration characteristic；And stator end assembling structure is complicated, end is conformal and Binding material also by construction environment temperature etc. because Element influences, and influences end intrinsic frequency by biggish uncertain factor, and stator end intrinsic frequency after completion is caused to exist Biggish discreteness, thus new design and the product of duplication of production often occur the stator end vibration shape be not achieved national standard and The requirement of Utilities Electric Co.'s relevant criterion is unable to satisfy the phenomenon that contract requirement；Once there is this problem, it is generally difficult to handle, It is limited by structure and operation environment, generator stator end binding structure cannot use metal structure, can not influence to divulge information cold But, very harsh to the restrictive condition of binding structure design, once construction finishes, the application space of Iterim Change binding structure by It to many restrictions and is difficult to carry out, traditional remedial measure is little on the change of stator end vibration shape influence, can only generally change The intrinsic frequency of 1-2Hz, the situation for causing end elliptical vibration frequency that cannot avoid within the scope of 95-110Hz happen occasionally；It is former Cause is that postorder binding can only be attached to upper layer stator bar and lower layer's stator bar surface, cannot be formed and tighten power, cannot So that upper layer stator bar is closely fixed together with lower layer stator bar, overall stiffness cannot be made obviously to be reinforced, thus End elliptical vibration frequency cannot be made to be substantially change.

To solve this problem, domestic and international generator manufactory all successively releases improved structural measure, such as originating from Europe " radial rigidity can tensioner again support construction ", be made of support ring, inclined wedge and insulation blanket stud and nut, support ring etc., can To realize the variation of fastening force by adjusting insulation blanket stud and nut, achieve the purpose that change stator end elliptical vibration frequency, But should structure is complicated, cost is high, it is stringent to require mounting and adjusting, there is also adjustment parts more, insulation blanket stud and nut check are tired It is difficult, be easy to induce the hidden danger for loosening abrasion, using being restricted；And this scheme can be only applied to newly design, it is necessary to thoroughly Change design structure, remedying for existing design structure can not be applied to.

It takes in recent years and whole glass filament bundle reinforcing ring is set at insulation booth outer diameter, generator stator end is made to insulate Whole coil structures globality is reinforced at box, the method for promoting generator end entirety intrinsic frequency, and patent applied for, through practicing Verifying, according to said method construct after, stator winding end entirety intrinsic frequency have promoted about 8Hz case, effect be significantly better than with Toward method, part substandard product has successfully been remedied；But the product excessive for frequency departure, this method are still unable to satisfy frequency Rate change demand, after construction stator winding end entirety intrinsic frequency still fall within it is unqualified within the scope of.

If implementing to bind at stator end involute position, keep upper layer stator bar and lower layer stator bar close Be fixed together, achieve the effect that the overall stiffness for the stator end for significantly reinforcing having completed, significantly change to reach Become the purpose of stator winding end entirety intrinsic frequency；But problem is that the binding that postorder remedial measure is implemented can not shape At the enough power of tightening, it is difficult to achieve the effect that make upper layer stator bar to be closely fixed together with lower layer stator bar, no Overall stiffness can be made obviously to be reinforced, end elliptical vibration frequency can not be made to be substantially change.

Summary of the invention:

The utility model discloses a kind of ripple spring washer form involute position Tensioning structure, has unlike previous technologies Structure type, the elastic acting force put aside using ripple spring washer, the binding structure for implementing postorder remedial measure forms taut Clamp force makes upper layer stator bar be closely fixed together with lower layer's stator bar, makes itself overall stiffness of involute position Obviously reinforced, substantially change end elliptical vibration frequency, can effectively promote stator winding end overall stiffness, Generator Stator Winding Ends entirety intrinsic frequency is promoted, Generator Stator Winding Ends body vibration mode is made to meet related mark Quasi- and contract requirement guarantees generator operational safety.The technical solution of the utility model are as follows: a kind of ripple spring washer form is gradually opened Line position Tensioning structure, the structure by lower laminated plank, the conformal pad of lower layer, the conformal pad in upper layer, upper laminated plank, ripple spring washer, cover board, Bandage is constituted, which is mounted on turbogenerator stator winding end portion involute position, lower laminated plank and lower layer's stator bar Between pad the conformal pad of lower layer, between upper laminated plank and upper layer stator bar pad the conformal pad in upper layer, the upper surface of upper laminated plank There is chamber, to accommodate ripple spring washer, the lower surface of cover board has boss to contact with ripple spring washer, and bandage passes through lower layer's stator bar Closed-loop is constituted with the through hole that upper layer stator bar is formed, to lower laminated plank, the conformal pad of lower layer, lower layer's stator bar, interlayer The structure formation binding constraint of conformal pad, upper layer stator bar, the conformal pad in upper layer, upper laminated plank, ripple spring washer, cover board composition, Ripple spring washer is in confined state.

Technical effect: closing is formed since bandage passes through the through hole that lower layer's stator bar and upper layer stator bar are formed Ring, can to the conformal pad of the lower laminated plank, lower layer that successively laminate, lower layer's stator bar, the conformal pad of interlayer, upper layer stator bar, The conformal pad in upper layer, upper laminated plank, ripple spring washer, cover board form constraint and fix, and bandage utilizes lower layer's stator bar and upper layer stator The through hole that bar is formed forms binding closed-loop, so that construction can carry out subsequent job after stator winding assembles, Bandage is wound using the glass filament bundle of epoxy resin-impregnated, is convenient for across through hole, since ripple spring washer is in confined state, Under the constraint fixed function of its screen resilience and bandage, make the conformal pad of the lower laminated plank successively laminated, lower layer, lower layer's stator line The conformal pad of stick, interlayer, upper layer stator bar, the conformal pad in upper layer, upper laminated plank, ripple spring washer, cover board form interaction force, produce It gives birth to layer stator bar and upper layer stator bar is firmly bound effect together, so that lower layer's stator bar and upper layer are fixed The globality of taper type end construction based on sub-line stick is improved, and overall stiffness increases, and body vibration frequency rises；Under The conformal pad pad of layer avoids generation localized contact that stress is caused to concentrate between lower layer's stator bar and lower laminated plank；Upper layer is suitable Shape pad pad avoids generation localized contact that stress is caused to concentrate between upper layer stator bar and upper laminated plank；Upper laminated plank Upper surface has chamber to accommodate ripple spring washer, avoids ripple spring washer from escaping, the lower surface of cover board has boss to connect with ripple spring washer Touching generates pressing force to ripple spring washer, can be convenient for constructing operation using cover board and upper laminated plank composite structure, reaching makes ripple Spring washer is put aside the effect of elastic force by compression.

Detailed description of the invention:

Fig. 1 is the utility model application schematic diagram, and view section is stator end involute position.

Fig. 2 is the A-A cross-sectional view of Fig. 1.

Fig. 3 is the B direction view of Fig. 1.

Fig. 4 is stator end axial view.

Fig. 5 is using the stator end axial view after the construction of the utility model arrangement and method for construction.

Specific embodiment:

As shown in Figure 1, Figure 2, Figure 3 shows, a kind of ripple spring washer form involute position Tensioning structure, the structure is by lower laminated plank 1, the conformal pad 2 of lower layer, the conformal pad 3 in upper layer, upper laminated plank 4, ripple spring washer 5, cover board 6, bandage 7 are constituted, which is mounted on vapour Turbine generator stator winding end involute position pads the conformal pad 2 of lower layer between lower laminated plank 1 and lower layer's stator bar 9, on The conformal pad 3 in upper layer is padded between laminated plank 4 and upper layer stator bar 10, there is chamber 11 in the upper surface of upper laminated plank 4, to accommodate Ripple spring washer 5, the lower surface of cover board 6 have boss 12 to contact with ripple spring washer 5, and bandage 7 passes through lower layer's stator bar 9 and upper layer is fixed The through hole that sub-line stick 10 is formed constitutes closed-loop, conformal to lower laminated plank 1, the conformal pad 2 of lower layer, lower layer's stator bar 9, interlayer The structure that pad 8, upper layer stator bar 10, the conformal pad 3 in upper layer, upper laminated plank 4, ripple spring washer 5, cover board 6 form forms binding about Beam, ripple spring washer 5 are in confined state；It is passed through since bandage 7 passes through lower layer's stator bar 9 with what upper layer stator bar 10 was formed Perforation forms closed-loop, can be to the lower laminated plank 1, the conformal pad 2 of lower layer, lower layer's stator bar 9, the conformal pad of interlayer successively laminated 8, upper layer stator bar 10, the conformal pad 3 in upper layer, upper laminated plank 4, ripple spring washer 5, cover board 6 form constraint and fix, and bandage 7 utilizes The through hole that lower layer's stator bar 9 and upper layer stator bar 10 are formed forms binding closed-loop so that construction can stator around Subsequent job is carried out after group assembly, since ripple spring washer 5 is in confined state, in its screen resilience tensioner and bandage 7 It constrains under fixed interaction, keeps the conformal pad 2 of the lower laminated plank 1 successively laminated, lower layer, lower layer's stator bar 9, interlayer suitable Shape pad 8, upper layer stator bar 10, the conformal pad 3 in upper layer, upper laminated plank 4, ripple spring washer 5, cover board 6 form interaction force, cause Lower layer's stator bar 9 with upper layer stator bar 10 by the effect together with firm binding and fixing so that lower layer's stator bar 9 It is improved with the globality of taper type end construction based on upper layer stator bar 10, overall stiffness increases, body vibration Frequency rises；For the conformal liner of pad 2 of lower layer between lower layer's stator bar 9 and lower laminated plank 1, the conformal pad 2 of lower layer is dipping epoxy The terylene felt of resin, can it is conformal filling lower layer's stator bar 9 and lower laminated plank 1 between irregular gap, construction solidification after Lower laminated plank 1 can be made reliably to transmit pressure texture comprehensively with lower layer's stator bar 9, generation localized contact is avoided to cause stress It concentrates；For the conformal liner of pad 3 in upper layer between upper layer stator bar 10 and upper laminated plank 4, the conformal pad 3 in upper layer is epoxy resin-impregnated Terylene felt, can it is conformal filling upper layer stator bar 10 and upper laminated plank 4 between irregular gap, construction solidification after can So that lower laminated plank 4 is reliably transmitted pressure texture comprehensively with upper layer stator bar 10, generation localized contact is avoided to cause stress collection In；The upper surface of upper laminated plank 4 has chamber 11 to accommodate ripple spring washer 5, avoids ripple spring washer 5 from escaping, the lower surface of cover board 6 There is boss 12 to contact with ripple spring washer 5, pressing force is generated to ripple spring washer 5, is combined using upper laminated plank 4 with the structure of cover board 6 It can be convenient for construction and installation, when installation, is forced together the upper laminated plank 4 for including ripple spring washer 5 with cover board 6 using external force, Take-up strap bandage 7 cancels external force after the solidification of bandage 7, and the elastic force that ripple spring washer 5 is put aside by compression is released, and formation is risen Clamp force；Bandage 7 is the glass filament bundle for impregnating room temperature curing epoxy, is in soft condition before solidification, can fit through and pass through The operation of through-hole, commensurate structure size, fits closely with by binding structure, and the closed-loop with fastening strength is formed after solidification, Ripple spring washer 5 be laminated epoxy glass-cloth board material, elasticity preferably, be under pressure can with deformation occurs and generate continue elastic force, Shape is the thin plate that wave state is presented, and lower laminated plank 1, upper laminated plank 4, cover board 6 are also laminated epoxy glass-cloth board material, all Have excellent insulation performance, not by end electromagnetic force influence, do not generate the stable feature of electromagnetic consumable, performance, thing will not be brought Therefore hidden danger；The quantity for installing the ripple spring washer form involute position Tensioning structure can determine according to required adjustment frequency data Fixed, the installation number the more, and stator end overall stiffness promotes effect and is more obvious, stator end vibration frequency rising value after construction Higher, stator end vibration frequency rises in qualified numberical range after selecting suitable quantity that can make construction, the ripple The installation direction of spring washer form involute position Tensioning structure is the generatrix direction of stator end frustum structure；Fig. 4 is not use The stator end view of the utility model arrangement and method for construction construction, Fig. 5 are using the stator after the construction of the utility model arrangement and method for construction End view, which shows is mounted with eight sets of ripple spring washer form involute position Tensioning structures altogether, using along stator terminal The generatrix direction of portion's frustum structure is installed and uniformly distributed distribution form.

Claims (1)

1. a kind of ripple spring washer form involute position Tensioning structure, it is characterized in that: by lower laminated plank (1), the conformal pad of lower layer (2), the conformal pad (3) in upper layer, upper laminated plank (4), ripple spring washer (5), cover board (6), bandage (7) are constituted, and ripple spring washer form is gradually The position Tensioning structure that bursts at the seams is mounted on turbogenerator stator winding end portion involute position, lower laminated plank (1) and lower layer's stator The conformal pad (2) of lower layer is padded between bar (9), and the conformal pad in upper layer is padded between upper laminated plank (4) and upper layer stator bar (10) (3), the upper surface of upper laminated plank (4) has chamber (11), and to accommodate ripple spring washer (5), there is boss in the lower surface of cover board (6) (12) it is contacted with ripple spring washer (5), bandage (7) passes through the perforation that lower layer's stator bar (9) and upper layer stator bar (10) are formed Hole constitutes closed-loop, fixed to lower laminated plank (1), the conformal pad (2) of lower layer, lower layer's stator bar (9), the conformal pad (8) of interlayer, upper layer The structure formation of sub-line stick (10), the conformal pad (3) in upper layer, upper laminated plank (4), ripple spring washer (5), cover board (6) composition is bound about Beam, ripple spring washer (5) are in confined state.