Integrated forging lower box body for wind power speed reducer

Abstract

The utility model discloses an integrated forging lower box body for a wind power speed reducer, relates to the technical field of wind power speed reducers, and can effectively improve the performance of a wind generating set, effectively improve the tensile strength and the yield strength and optimize the structure of a lower box body of a traditional wind power speed reducer. According to the integrally-forged lower box body for the wind power speed reducer, the integrally-forged lower box body is formed by forging the lower box body on forging equipment at a time, and no welding or connection in other forms is carried out; in addition, high-strength alloy structural steel 42CrMoA is selected as a forging blank material; meanwhile, a bearing larger than the inner size of the casting lower box body is selected for the integrally-forged lower box body.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of wind power reducer especially relates to a wind power reducer is with integrated forging lower box, is applicable to the wind power reducer of big wind power bearing capacity and compact internal structure. BACKGROUND

[0002] At present, energy transformation has become the consensus of the world, and renewable energy has gradually become the core of global energy transformation. Among them, wind power is vigorously developed due to its clean, renewable and non-polluting advantages.

[0003] The technical level of wind turbine generators has improved, and the single-machine capacity of wind turbine generators in China has gradually developed from 1MW to 4-5MW, and even offshore wind turbine generators have reached 10MW. Now, to reduce construction and operation and maintenance costs, high power of the unit has become an inevitable trend of wind power development.

[0004] With the high power of wind turbine generators, higher requirements are put forward for the safety and performance of wind power reducers. In the prior art, the metal material used for the lower box of the wind power reducer is mostly cast iron, which is heavy and can easily affect the performance of the wind turbine generator, and has poor tensile strength and yield strength, which cannot meet the performance requirements of the wind power reducer.

[0005] Therefore, how to provide an integrated forged lower box for a wind power reducer, which can reduce the weight and height of the wind power reducer, effectively improve the performance of the wind turbine generator, and meet the requirements of tensile strength and yield strength, has become a technical problem that technicians in the field need to solve urgently. INVENTION CONTENTS

[0006] The utility model aims at providing an integrated forged lower box for a wind power reducer, which can effectively improve the performance of the wind turbine generator, and effectively improve the tensile strength and yield strength, and optimize the lower box structure of the traditional wind turbine reducer.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0008] An integrated forged lower box for a wind power reducer is formed by one-time forging on a forging equipment without any welding or other form of connection, and high-strength alloy structural steel 42CrMoA is selected as the forging blank material, and the integrated forged lower box selects a bearing with a larger internal size than the cast lower box.

[0009] In actual application, the lower flange stopper diameter of the lower box is Φ420, and the wall thickness of the lower box is 16.5mm.

[0010] The wind power reducer integrated forged lower box has the following advantages relative to the prior art.

[0011] The wind power reducer integrated forged lower box provided by the utility model has the advantages that the integrated forged lower box is formed by one-time forging on a forging equipment, and does not need any welding or other connection, so that the integrated forged lower box can significantly improve the overall strength and durability of the lower box; the high-strength alloy structural steel 42CrMoA is used as the forging blank material, so that the hardenability is good, there is no obvious temper brittleness, the fatigue limit and the ability to resist multiple impacts are high after the quenching and tempering treatment, and the low-temperature impact toughness is good; the integrated forged lower box uses bearings with larger sizes than the internal dimensions of the cast lower box, so that the bearings can bear larger loads after the sizes of the bearings are increased, the distance between the bearings used in the wind power reducer lower box part is effectively reduced, so that the height of the lower box is reduced, the height and weight of the wind power reducer are reduced, and the performance of the wind turbine generator system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The wind power reducer integrated forged lower box provided by the utility model has the advantages that the integrated forged lower box is formed by one-time forging on a forging equipment, and does not need any welding or other connection, so that the integrated forged lower box can significantly improve the overall strength and durability of the lower box; the high-strength alloy structural steel 42CrMoA is used as the forging blank material, so that the hardenability is good, there is no obvious temper brittleness, the fatigue limit and the ability to resist multiple impacts are high after the quenching and tempering treatment, and the low-temperature impact toughness is good; the integrated forged lower box uses bearings with larger sizes than the internal dimensions of the cast lower box, so that the bearings can bear larger loads after the sizes of the bearings are increased, the distance between the bearings used in the wind power reducer lower box part is effectively reduced, so that the height of the lower box is reduced, the height and weight of the wind power reducer are reduced, and the performance of the wind turbine generator system is improved.

[0013] Figure 2 The wind power reducer integrated forged lower box provided by the utility model has the advantages that the integrated forged lower box is formed by one-time forging on a forging equipment, and does not need any welding or other connection, so that the integrated forged lower box can significantly improve the overall strength and durability of the lower box; the high-strength alloy structural steel 42CrMoA is used as the forging blank material, so that the hardenability is good, there is no obvious temper brittleness, the fatigue limit and the ability to resist multiple impacts are high after the quenching and tempering treatment, and the low-temperature impact toughness is good; the integrated forged lower box uses bearings with larger sizes than the internal dimensions of the cast lower box, so that the bearings can bear larger loads after the sizes of the bearings are increased, the distance between the bearings used in the wind power reducer lower box part is effectively reduced, so that the height of the lower box is reduced, the height and weight of the wind power reducer are reduced, and the performance of the wind turbine generator system is improved. DETAILED DESCRIPTION

[0014] In order to facilitate understanding, the wind power reducer integrated forged lower box provided by the utility model is described in detail below with reference to the accompanying drawings.

[0015] The wind power reducer integrated forged lower box provided by the utility model has the advantages that the integrated forged lower box is formed by one-time forging on a forging equipment, and does not need any welding or other connection, so that the integrated forged lower box can significantly improve the overall strength and durability of the lower box; the high-strength alloy structural steel 42CrMoA is used as the forging blank material, so that the hardenability is good, there is no obvious temper brittleness, the fatigue limit and the ability to resist multiple impacts are high after the quenching and tempering treatment, and the low-temperature impact toughness is good; the integrated forged lower box uses bearings with larger sizes than the internal dimensions of the cast lower box, so that the bearings can bear larger loads after the sizes of the bearings are increased, the distance between the bearings used in the wind power reducer lower box part is effectively reduced, so that the height of the lower box is reduced, the height and weight of the wind power reducer are reduced, and the performance of the wind turbine generator system is improved. Figure 1 and Figure 2 The wind power reducer integrated forged lower box provided by the utility model has the advantages that the integrated forged lower box is formed by one-time forging on a forging equipment, and does not need any welding or other connection, so that the integrated forged lower box can significantly improve the overall strength and durability of the lower box; the high-strength alloy structural steel 42CrMoA is used as the forging blank material, so that the hardenability is good, there is no obvious temper brittleness, the fatigue limit and the ability to resist multiple impacts are high after the quenching and tempering treatment, and the low-temperature impact toughness is good; the integrated forged lower box uses bearings with larger sizes than the internal dimensions of the cast lower box, so that the bearings can bear larger loads after the sizes of the bearings are increased, the distance between the bearings used in the wind power reducer lower box part is effectively reduced, so that the height of the lower box is reduced, the height and weight of the wind power reducer are reduced, and the performance of the wind turbine generator system is improved.

[0016] The wind power reducer integrated forged lower box provided by the utility model has the advantages that the integrated forged lower box is formed by one-time forging on a forging equipment, and does not need any welding or other connection, so that the integrated forged lower box can significantly improve the overall strength and durability of the lower box; the high-strength alloy structural steel 42CrMoA is used as the forging blank material, so that the hardenability is good, there is no obvious temper brittleness, the fatigue limit and the ability to resist multiple impacts are high after the quenching and tempering treatment, and the low-temperature impact toughness is good; the integrated forged lower box uses bearings with larger sizes than the internal dimensions of the cast lower box, so that the bearings can bear larger loads after the sizes of the bearings are increased, the distance between the bearings used in the wind power reducer lower box part is effectively reduced, so that the height of the lower box is reduced, the height and weight of the wind power reducer are reduced, and the performance of the wind turbine generator system is improved.

[0017] The integral forged lower box body can significantly improve the overall strength and durability of the lower box body; and because high-strength alloy structural steel 42CrMoA is selected as the forging blank material (the 42CrMoA steel material has high strength and toughness), the hardenability is good, there is no obvious temper brittleness, the fatigue limit and the ability to resist multiple impacts are high after quenching and tempering treatment, and the low-temperature impact toughness is good; at the same time, because the integral forged lower box body selects a bearing with a larger internal size than the cast lower box body, the bearing can carry a larger load after the size of the bearing is increased, and the distance between the bearings used in cooperation in the lower box body part of the wind power reducer can be effectively reduced, so that the height size of the lower box body can be reduced, and the height and weight of the whole wind power reducer can be reduced, thereby effectively improving the performance of the wind turbine generator.

[0018] The mechanical properties of the 42CrMoA sample according to the standard GB / T3077-2015 are shown in Table 1.

[0019]

[0020] Table 1: Mechanical properties of 42CrMoA

[0021] In actual application, the integral forged lower box body has incomparable advantages compared to the traditional cast lower box body; under the same size requirements, the integral forged lower box body can use a thinner wall thickness to meet the strength requirements.

[0022] Specifically, as shown in Figure 1 the diameter of the lower flange stop of the lower box body can be Φ420, and the wall thickness of the lower box body can be 16.5mm. That is, the same customer requires the diameter of the lower flange stop of the lower box body to be Φ420, and when using the cast lower box body, the wall thickness of the lower box body needs to be designed as 38.5mm due to the limitation of the mechanical properties of the QT400-18L material after finite element calculation and checking; and when using the forged lower box body, the mechanical properties of the 42CrMoA material are better than those of the QT400-18L, and the wall thickness of the lower box body can be designed as 16.5mm after finite element calculation and checking.

[0023] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An integrated forged lower housing for a wind turbine reducer, characterized by, The integral forging lower box is formed by one-time forging on a forging equipment without any welding connection, and high-strength alloy structural steel 42CrMoA is selected as the forging blank material, and the integral forging lower box selects the bearing with larger internal size than the cast lower box.

2. The one-piece forged lower case for a wind turbine reducer according to claim 1, characterized by, The lower flange stopper diameter of the lower box is Φ420, and the wall thickness of the lower box is 16.5mm.

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