CN202900736U - Multi-step seam allowance interference sleeving structure - Google Patents

Abstract

The utility model relates to a multi-step seam allowance interference sleeving structure. A heat sleeving ring of the multi-step seam allowance interference sleeving structure is in interference fit with a shaft through a matching surface of which the diameters of a plurality of sections are gradually increased in a step manner, so that the length of each section of the matching surface is relatively short; and a contact sliding distance during heat sleeving is equal to that during heat sleeving of fan seat rings of a single-level fan, so that operation difficulty caused by an overlong contact sliding distance is solved.

Description

Multistage ladder seam interference structure

Technical field: the utility model relates to a kind of multistage ladder seam interference structure.

Background technique: be accompanied by the development of economic technology, the electrical network scale constantly enlarges, the market demands such as energy-saving and cost-reducing, sustainable development, impel the generator single-machine capacity constantly to increase, the key issue of steam turbine generator high capacity is that the thermal energy transfer that the various electricity in the generator, magnetic, wind moussing loss produce is distributed, otherwise these heat energy constantly accumulation can cause the temperature of generator inner structure constantly to raise, the operation of harm generator, even burn generator.

The steam turbine generator synchronous speed is up to 3000r/min, the suffered centrifugal force of rotor structure is large, be subjected to the restriction of the strength of materials limit of the rotor parts such as rotating shaft, retrained stator of steam turbine generator, the overall dimensions of the section of rotor, circuit, magnetic circuits etc. depend on cross-section size, and to increase to satisfy the condition that capacity increases restrained, the design of steam turbine generator high capacity is restricted, electricity, the transmission of the heat energy that magnetic loss produces is distributed becomes design focus and restriction bottleneck, steam turbine generator magnetic pole logarithm is few in addition, stator parallel branch number is also few, the every utmost point excitation capacity of rotor is large, make this contradiction more outstanding, the problem of distributing of the heat energy that produces round various losses has formed the various structures type of steam turbine generator at design form, be accompanied by the raising of capacity, the structure even more complex that heat energy distributes.

The gas cooling generator has simple in structure, reliable, operation maintenance equipment is few, the advantage of easy maintenance, can be by selecting different gaseous species, pressure improves radiating effect, the heat energy that satisfies generator distributes requirement, but being accompanied by the generator single-machine capacity constantly increases, the heat energy that various losses in the steam turbine generator produce constantly increases, for tackling these problems, more complicated ventilating structure for magneto generator is suggested, Power generator fan structure in the past can not satisfy the demand of these new ventilating structure for magneto generators, the fan of the new structure form that active demand adapts with it, the fan of these new structure forms is more complicated than single-stage fan structure in the past, its fan base ring length also more in the past single-stage fan structure is longer, long interference hot jacket face can produce some technical difficulty in the assembling construction, this is because the fan seat ring is alloyed steel, thermal expansion coefficient is less, heating-up temperature is also limited, to avoid changes in material properties, the fan seat ring is heated rear generation thermal expansion makes the diameter increase limited, after offsetting tight numerical quantity, only can be between the matching part of the hole of fan seat ring and axle the small diametric clearance of generation, relative slippage can only slowly be carried out during hot jacket, if skidding distance is long, the temperature of fan seat ring can reduce gradually, heat also can be delivered on the axle, diametric clearance is constantly reduced, make relatively move difficulty or clamping stagnation, hot jacket is constructed unsuccessfully.So propose novel multistage ladder seam interference structure, solve the hot jacket construction problem of the long fan seat ring of axial dimension.

Summary of the invention: the purpose of this utility model provides a kind of multistage ladder seam interference structure, for the characteristics of gas cooling Power generator fan, reaches the purpose that not only satisfies performance requirement but also the assembling easy construction should be gone.The technical solution of the utility model: the utility model is a kind of multistage ladder seam interference structure, and fitting surface that stairstepping increases gradually is equipped to be consisted of by presenting by the multistage diameter between shrink ring and the axle, is interference fit between the fitting surface.

Technique effect: the fan seat ring of single-stage fan in the past is the interference fit face of single diameter, and is to present fitting surface interference fit that stairstepping increases gradually by the multistage diameter between shrink ring of the present utility model and the axle.Owing to being to present fitting surface interference fit that stairstepping increases gradually by the multistage diameter between shrink ring of the present utility model and the axle, so the length of every section fitting surface is shorter, during hot jacket during the fan seat ring hot jacket of contact slide distance and single-stage fan the contact slide distance quite, the operating difficulties problem of having avoided long contact slide distance to bring.

Description of drawings:

Fig. 1 is the multistage ladder seam of the utility model interference structural representation

Fig. 2 is that the multistage ladder seam of the utility model interference structure enters the cooperation initial state and enters final mated condition schematic diagram

Embodiment:

As shown in Figure 1, the utility model is a kind of multistage ladder seam interference structure, is presented by the multistage diameter between shrink ring 1 and the axle 2 that fitting surface that stairstepping increases gradually 3 is equipped to be consisted of, and is interference fit between the fitting surface.

Every section length equates, first shrink ring 1 is heated to predetermined temperature during the hot jacket operation, make it internal diameter and increase to preliminary dimension, because the section diameter increases gradually, adjacent two sections axle and the diametric clearance in hole are larger, shrink ring 1 fast moving is arrived cooperate initial state, see the state I of Fig. 2, avoid the drop in temperature diameter of shrink ring 1 to diminish and make gap smaller cause front mobile difficulty in place or clamping stagnation, after entering the cooperation initial state, the displacement distance of shrink ring only is the length of one section fitting surface, can move shorter distance and enter final mated condition, after the temperature of shrink ring 1 reduces, diameter recovers normal state, namely can lock ring on axle 2, see the state II of Fig. 2, mobile difficulty or the clamping stagnation problem of having avoided long displacement distance to bring.

Claims (1)

1. multistage ladder seam interference structure is characterized in that: being presented by the multistage diameter between shrink ring (1) and the axle (2) that fitting surface (3) that stairstepping increases gradually is equipped to be consisted of, is interference fit between the fitting surface.

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