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Stress analysis and selective installation method of vertical pump set motor bearing

A technology for motor bearings and force analysis, applied to pump devices, electromechanical devices, non-variable pumps, etc., can solve the problems of rapid temperature rise, high temperature, and easy burning of bearings, and achieve the effect of reducing the failure rate

Pending Publication Date: 2021-03-05
桑河二级水电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an installation method using angular contact bearings + shock absorbers (pads) to solve the problems of rapid temperature rise, high temperature, and easy burnout of vertical pump motor bearings in complex environments, and can effectively reduce power generation. The failure rate of the secondary circulating water pump of the machine

Method used

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  • Stress analysis and selective installation method of vertical pump set motor bearing
  • Stress analysis and selective installation method of vertical pump set motor bearing
  • Stress analysis and selective installation method of vertical pump set motor bearing

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Such as figure 1 As shown, the gravity, the centrifugal force generated by the rotor unbalance and the unilateral magnetic pulling force that occurs when the axis of the stator and rotor are offset act on point A of the rotor center of gravity. Point B not only acts on its own gravity and impeller gravity, but also bears the action force and reaction force of water. It can be seen from this that the shaft extension bearing of the vertical motor bears a large load, because the installation position is on the water sealing cover plate and the strength and rigidity of the cover plate are poor. The stress generated by the rotation of the motor itself is superimposed on the foundation vibration of the water sealing cover plate, the hydraulic vibration of the pipeline and other factors, which intensifies the damage speed of the bearing at the shaft extension end of the vertical pump unit.

[0019] According to the radial balance condition of the force, the radial load Fr1 an...

Embodiment 2

[0025] The secondary circulation cooling water pumps of No. 1 to No. 8 bulb tubular generator sets of the SH II Hydropower Station adopt vertical pump sets and are installed on the unit sealing water cover. Since the units were put into operation, the bearing temperature rises rapidly, the operating temperature is high, and failures occur frequently. High incidence, as an important part of the cooling system of the generator set, the high incidence of failure seriously threatens the safe and stable operation of the generator set. The inventors selected the secondary circulation water pumps of No. 2 and No. 6 generators of the power station as the research object, and carried out actual implementation, as follows:

[0026] Step 1: Confirm the installation environment of the vertical pump set. Due to the limited installation space, the vertical pump sets are all installed on the water sealing cover plate of the generator. The water sealing cover plate is welded with steel struct...

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Abstract

The invention discloses a stress analysis and selective installation method of a vertical pump set motor bearing, and aims to solve the problems that a vertical pump set motor bearing is quick in temperature rise, high in temperature, easy to burn and the like in a complex environment. The vertical pump set comprises a motor shaft and bearings at the two ends, the bearings comprise a non-shaft-extension-end bearing and a shaft-extension-end bearing, and the method comprises the following steps: step 1, confirming the installation environment of the vertical pump set; step 2, analyzing the stress of the motor bearing, calculating radial loads Fr1 and Fr2 on the first bearing and the second bearing according to the radial force Fr acting on the shaft from the outside, determining the radialloads Fr1 and Fr2 when the acting point of the Fr is fixed, and if the axial forces Fd1 and Fd2 derived by the Fr1 and Fr2 and the external axial load Fa are positioned on a plumb line, axial balanceis achieved if Fa+Fd2=Fd1; and step 3, selecting and mounting a motor bearing: in actual operation, according to stress analysis, installing an angular contact type deep groove ball bearing at the non-shaft extension end, and mounting a deep groove ball bearing at the shaft extension end. The bearing fault rate of the vertical pump set in a complex operation environment can be effectively reduced.

Description

technical field [0001] The invention relates to a force analysis method and a method for selecting and installing motor bearings of a vertical pump set, and belongs to the technical field of hydroelectric power generation and vertical pump sets. Background technique [0002] With the development of hydraulic resources in the world, the bulb tubular unit with low water head has gradually become a new development direction, and the bulb tubular unit is more and more popular due to the saving of civil construction costs, low investment cost, and wide efficiency area. Favored. [0003] However, due to the compact layout of this model, it becomes difficult to select the installation location of some auxiliary equipment. If the installation foundation is established separately, otherwise the amount of civil engineering and electromechanical installation will be increased. In order to reduce construction costs, this group is installed on the generator. The water sealing cover is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/20F04D13/06F04D29/66H02K5/173G06F119/14
CPCG06F30/17G06F30/20F04D13/06F04D29/669H02K5/1732G06F2119/14
Inventor 裴红洲孙永海赵安波张颖何建东燕翔何云春李明李锦李建刚
Owner 桑河二级水电有限公司