Motor sliding bearing

Abstract

The invention belongs to the technical field of mechanical equipment bearings and particularly relates to a sliding bearing of a motor. The sliding bearing consists of an upper half part and a lower half part and comprises a tile body, tile pads, insulating layers, a sealing ring, insulating pins, insulating sleeves and bolts. The sliding bearing is characterized in that the outer surfaces of the upper half and the lower half of the tile body are respectively provided with the tile pad; the insulating layers are arranged between the tile pads and the tile body, and after the insulating pins are used for positioning, the bolts with the insulating sleeves are adopted for fastening; the inner surface of the tile pad is provided with a water flow channel; and the sealing ring is arranged around the water flow channel. Due to adoption of the scheme, the sliding bearing has the beneficial effects that (1) the structure of a water cavity is simple, the sealing is reliable, and compared with the traditional water-cavity bearing, the contact area of cooling water is large, the cooling effect is good, and special molds do not need to be used for manufacture, so that the production cost is greatly saved; (2) the insulating structure is ingeniously arranged, so that the generation of friction pairs is effectively avoided and the insulating effect is more reliable; and (3) due to combined use of the water cooling function and the insulating function, the bearing of the motor has the insulating characteristic, the bearing capability and the critical speed of rotation are improved, and the use performance is greatly enhanced.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment bearings, in particular to a motor sliding bearing. Background technique [0002] With the development of the national economy and the implementation of the national energy policy, all kinds of electrical equipment are developing in the direction of large-scale and high-efficiency. Therefore, the increase of the diameter of the rotor and the increase of the rotational speed put forward higher requirements for its supporting part - the sliding bearing, which is mainly manifested in: how to improve its carrying capacity and critical speed and how to prevent the shaft current from destroying the oil film of the sliding bearing. [0003] At present, most of the motor sliding bearings are actually in the mixed lubrication state when they are working, that is, the boundary lubrication and liquid lubrication coexist. Therefore, when the load increases and the speed increases, the PV value in...

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Problems solved by technology

[0003] At present, most of the sliding bearings of motors are actually in a mixed lubrication state when they are working, that is, a state where boundary lubrication and liquid lubrication exist at the same time. Therefore, when the load increases and the speed increases, the PV value increases, ( PV value--a parameter that reflects the friction power consumption and heat generation per unit area) The larger the PV, the higher the temperature rise of the bearing, which is likely to cause the rupture of the boundary oil film, resulting in damage to the bearing and affecting the safe operation of the unit

The traditional solution is to set up a water cavity in the bearing body and use the cooling water flow to take away the heat of the bearing. However, this kind of bearing has a complicated structure and requires a special mold to make the water cavity. The production cost is high, and due to the particularity of the motor and other equipment, The rotating shaft carries a voltage, and the conduction of water will form a path for the current, which will cause electrical corrosion with the inner hole of the bearing, destroy the oil film of the bearing, and make the bearing invalid. Therefore, how to make the bearing have an insulating function is also a problem that needs to be solved.

Existing motor bearings are shown in JB / T5888-2005, which isolates the bearing bush by pasting a polytetrafluoroethylene film on the spherical surface of the bearing seat, thereby cutting off the shaft current path, but this structure cannot realize the setting of the bearing water cooling function, and The insulating film is easily damaged during installation and maintenance, and the repair process after damage is also quite complicated, requiring special tooling, which causes great inconvenience

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