Water-lubricated thrust bearing of submersible motor for well

Abstract

The invention discloses a water-lubricating thrust bearing of submersible motors for wells. The water-lubricating thrust bearing comprises a thrust plate, a disc bearing base, a bearing base support, a bearing bush, a bearing plate and a plastic inner grinding ring; the bearing plate is fixed to the disc bearing base through a double-screw bolt; the bearing bush is composed of a plurality of independent fan-shaped bearing slide blocks, the upper planes of the fan-shaped bearing slide blocks are smooth, spherical crown-shaped protrusions are arranged at the middle parts of the bottom surfaces of the fan-shaped bearing slide blocks, side wings extending out symmetrically are arranged on the straight sides of the two sides of each fan-shaped bearing slide block, a pair of slide block limiting columns and a slide block supporting column in the bearing plate limit and support the fan-shaped bearing slide blocks respectively, and the slide blocks can be flexible but cannot be separated through cooperation with the plastic inner grinding ring; the upper surfaces and the lower surfaces of the side wings of the fan-shaped bearing slide blocks have temperature difference when the side wings work and generate frictional heating, and therefore the edges of the side wings are slightly bent and generate gaps with the thrust plate, and maintenance of a lubricating water film can be reinforced; through the plastic inner grinding ring, the axial bearing capacity is high, the material cost is low, the water lubrication capacity is improved, the service life is prolonged, and the product quality is improved.

Description

technical field [0001] The invention relates to a thrust bearing structure used in a submersible motor, in particular to a water-lubricated thrust bearing of a well-used submersible motor. Background technique [0002] In the prior art, thrust bearings of submersible motors for wells are used in submersible pumps for wells. They are important components that withstand the maximum axial pressure during work and play an important role in Motor water-lubricated thrust bearings, increasing the axial pressure bearing capacity of thrust bearings and improving water lubrication capabilities have always been technical problems in the industry that need to be solved. Among them, the Chinese invention patent "submersible motor thrust bearing" patent number is 200610124303.X and the Chinese invention patent "thrust bearing" patent No. 200610124319.0 are both aimed at solving the problem of increasing the axial pressure bearing capacity of the thrust bearing. The water-lubricated thrust...

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Problems solved by technology

The above structure has the advantages of strong pressure bearing capacity, simple structure shape, easy processing, easy to ensure manufacturing accuracy, and the fan-shaped bearing slider will not fall off. However, the above structure also has some disadvantages. When the head flow rate of the water pump is high, or when the submersible motor with high power is used, the thrust disc grinding plate and the fan-shaped bearing slider will be subject to great axial pressure and impact, which is easy to cause fragmentation. At present, in order to improve the thrust disc grinding In order to improve the strength of disc and fan-shaped bearing sliders, high-strength materials need to be selected, especially the thrust disc grinding discs and fan-shaped bearing sliders of high-power well-use submersible motors must be made of high-strength materials, but it is difficult to stabilize the source of materials in terms of material selection at present. As a result, the quality of materials cannot be guaranteed, and the cost of materials is also high. Due to the limitation of product prices, it is necessary to reduce the difficulty of material selection for thrust disc grinding discs and fan-shaped bearing sliders, and stabilize the source of materials, so as to ensure material quality and reduce material costs. Therefore, it can only be considered from the structural point of view to compensate the axial pressure and impact of the thrust disc grinding plate and the fan-shaped bearing slider. This technical problem is also a technical problem that has been studied and solved in the industry; The application number of "push bearing structure" is 201310469565.x, which solves these problems very well, but because the bearing needs water to cool and fully lubricate to prolong its service life, how to improve the lubricating ability of water to the bearing also needs research and development. Technical issues resolved

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