CN220302257U - Main shaft structure of high-rigidity wind generating set - Google Patents

Abstract

The utility model discloses a main shaft structure of a high-rigidity wind generating set, which comprises an inner hollow shaft, an outer hollow shaft and a first hollow shaft and a second hollow shaft, wherein the first hollow shaft is positioned in the second hollow shaft and is coaxial with the second hollow shaft, and the first hollow shaft and the second hollow shaft are connected and fixed into a whole through a plate-shaped structure. Under the condition of ensuring that the diameter of the bearing is unchanged, even if the length of the main shaft is prolonged, the bending moment resistance of the main shaft is greatly improved under the conditions of not changing the wall thickness of the main shaft and simple manufacturing process, and meanwhile, communication and power cables can be ensured to be connected to related equipment of the hub through the main shaft.

Description

Main shaft structure of high-rigidity wind generating set

Technical Field

The utility model relates to the technical field of wind generating sets, in particular to a main shaft structure of a high-rigidity wind generating set.

Background

The main shaft of the wind generating set is an important component part for connecting the hub and the gear box and is responsible for transmitting torque to the gear box and the generator, and simultaneously, loads in other directions of the hub are carried and transmitted to the stand through the bearing and the bearing seat. As shown in fig. 1, the main shaft 01 is connected with the hub 02, the main shaft 01 is connected with the inner rings of the front and rear bearings 03 and 04, the hub 02 rotates to transmit torque to the gear box through the main shaft 01, the outer rings of the front and rear bearings 03 and 04 are connected with the bearing seats 05 and 06, the bearing seats 05 and 06 are fixed on the base 07, and the main shaft 01 transmits other loads except the torque to the base 07 through the front and rear bearings 03 and 04 and the bearing seats 05 and 06.

At present, a main shaft of a wind generating set mainly comprises two modes of a forging piece and a casting piece, wherein the forging piece is suitable for a set with smaller main shaft size and relatively lower power. Along with the development of wind power generation technology, the power is larger and larger, and the size of the main shaft is also larger, so that the technical difficulty and cost for forging the main shaft are increased. Therefore, at present, the large-size and high-power fan main shaft adopts a casting main shaft scheme, the general casting main shaft is in a large hollow shaft structure as shown in fig. 2, the middle hollow part is used for passing a hub communication and power cable, and the hollow structure can reduce materials and weight, but the wall thickness is smaller relative to the length, and when the wall thickness is increased and is subjected to bending moment load in a non-rotating direction, the wall surface is easy to deform due to insufficient rigidity.

However, as the size of the main shaft increases, the diameter of the bearing of the main shaft also increases, which results in an increase in cost. However, if the diameter of the bearing is kept unchanged, the length of the main shaft needs to be increased, the moment arm is increased, and the force acting on the bearing is reduced. However, the hollow shaft with the thin-wall structure is increased in length, the bending moment resistance is weakened, and buckling or fracture is easy to occur. Therefore, in general, in order to secure rigidity of the spindle, the length is increased, the wall thickness is also required to be greatly increased, and the cost is increased. Meanwhile, the casting spindle has too thick wall thickness, and the probability of casting defects is increased.

Disclosure of Invention

The utility model aims to overcome the defects and shortcomings of the prior art, and provides a high-rigidity main shaft structure of a wind generating set, which can greatly increase the bending moment resistance of a main shaft under the conditions of ensuring that the diameter of a bearing is unchanged, not changing the wall thickness of the main shaft and simple manufacturing process even if the length of the main shaft is prolonged, and simultaneously ensure that communication and power cables can be connected to related equipment of a hub through the main shaft.

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows: the utility model provides a high rigidity wind generating set main shaft structure, includes inside and outside two hollow shafts, defines as first hollow shaft and second hollow shaft, first hollow shaft is located the inside of second hollow shaft to with the same axis of second hollow shaft, connect the solid as a whole through platelike structure between them.

Further, the plate-shaped structures are multiple and uniformly distributed along the circumferential direction of the two hollow shafts.

Furthermore, the two hollow shafts and the plate-shaped structure are integrally cast, and the joint of the plate-shaped structure and the two hollow shafts adopts fillet transition.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. under the condition of not increasing the diameter of the bearing and the wall thickness of the main shaft, the bending rigidity and the bending strength of the main shaft are greatly improved through optimizing the simple structure inside.

2. The main shaft structure is characterized in that a platy structure and a hollow shaft are additionally arranged on the basis of the original casting main shaft, so that the change is realized by only adding a plurality of wood molds on a casting mold, the upgrading and transformation cost of the casting mold is low, and the casting difficulty is low.

Drawings

Fig. 1 is a schematic installation view of a main shaft of a wind turbine generator system.

Fig. 2 is a cross-sectional view of a main shaft of a wind turbine generator system according to the prior art.

Fig. 3 is one of the perspective views of the main shaft structure of the high-rigidity wind generating set.

FIG. 4 is a second perspective view of a high stiffness wind turbine main shaft structure.

Fig. 5 is a front view of a main shaft structure of the high-rigidity wind generating set.

Detailed Description

The present utility model will be described in further detail with reference to examples and drawings, but embodiments of the present utility model are not limited thereto.

As shown in fig. 3 to 5, the present embodiment discloses a main shaft structure of a high-rigidity wind generating set, which comprises an inner hollow shaft and an outer hollow shaft, and is defined as a first hollow shaft 1 and a second hollow shaft 2; the outer diameter of the first hollow shaft 1 is 560mm, and the inner diameter is 400mm; the inner diameter of the inner wall of the cylinder of the second hollow shaft 2 is 1500mm, and the length is 4000mm; the first hollow shaft 1 is positioned in the second hollow shaft 2 and is in the same axis with the second hollow shaft 2, the first hollow shaft and the second hollow shaft are connected and fixed into a whole through three plate-shaped structures 3, the three plate-shaped structures 3 are uniformly distributed along the circumferential direction of the two hollow shafts, namely 120 degrees are arranged at intervals, the wall thickness of each plate-shaped structure 3 is 80mm, the two hollow shafts and the plate-shaped structures 3 are integrally cast, the strength is ensured, the joint of the plate-shaped structures 3 and the two hollow shafts adopts the transition of a circular angle, and the radius is 40mm, so that the stress concentration is reduced.

The first hollow shaft 1 plays two roles, namely, a communication power cable passes through the first hollow shaft and is connected with corresponding parts of the hub; and secondly, the bending moment load transmission is optimized, and the rigidity is improved. In general, the bending moment load transmission can only be carried out through the outer wall of the cylinder, so that the thin-wall structure is easy to bend and deform. After the plate-like structure 3 is added, the bending moment load is preferentially transmitted along the plate-like structure 3, and the bending section coefficient is high in the direction of the plate-like structure 3, so that the bending strength is also greatly improved.

Casting materials include, but are not limited to, spheroidal graphite cast iron, cast steel, and the like. Of course, the number of the plate-like structures is not limited to three, and may be any number, and the specific number is determined according to actual situations.

The above examples are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present utility model should be made in the equivalent manner, and the embodiments are included in the protection scope of the present utility model.

Claims (3)

1. The utility model provides a high rigidity wind generating set main shaft structure which characterized in that: the hollow shaft structure comprises an inner hollow shaft and an outer hollow shaft, which are defined as a first hollow shaft (1) and a second hollow shaft (2), wherein the first hollow shaft (1) is positioned in the second hollow shaft (2) and is coaxial with the second hollow shaft (2), and the first hollow shaft and the second hollow shaft are connected and fixed into a whole through a plate-shaped structure (3).

2. The high-rigidity wind generating set main shaft structure according to claim 1, wherein: the plate-shaped structures (3) are multiple and are uniformly distributed along the circumferential directions of the two hollow shafts.

3. A high stiffness wind power generator unit main shaft structure according to claim 1 or 2, wherein: the two hollow shafts and the plate-shaped structure (3) are integrally cast, and the joint of the plate-shaped structure (3) and the two hollow shafts adopts fillet transition.