Cooling bearing

Abstract

The invention discloses a cooling bearing. The cooling bearing comprises a bearing seat, a pad base, a positive thrust plate, a first oil cavity, a second oil cavity, a cooler and an oil driving cover, wherein the pad base is fixed to the bearing seat; a supporting pad is arranged on the inner diameter side of the pad base, and a positive thrust pad is arranged on the front side of the pad base; the second oil cavity communicates with the first oil cavity through a hot oil inlet, and the cooler is installed inside the second oil cavity; the oil driving cover and the positive thrust plate form an oil driving cavity; an oil injecting groove is formed in the inner diameter side of the supporting pad and is of a spiral shape; an oil throwing cavity is formed in the inner diameter side of the positive thrust pad; and the oil driving cavity comprises a high-pressure oil outlet and an oil pumping port, the oil pumping port communicates with the second oil cavity, and the high-pressure oil outlet communicates with the oil injecting groove and the oil throwing cavity. The cooling bearing has high heat exchange efficiency and can effectively prevent a bearing pad from being burnt.

Description

technical field [0001] The invention relates to the field of bearing devices, in particular to generator or motor bearings. Background technique [0002] Bearings are an important part of contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. According to the different friction properties of moving elements, bearings can be divided into two categories: rolling bearings and sliding bearings. [0003] Rolling bearings are generally composed of four parts: inner ring, outer ring, rolling body and cage. The function of the inner ring is to cooperate with the shaft and rotate together with the shaft; the function of the outer ring is to cooperate with the bearing seat to play a supporting role; The cage evenly distributes the rolling elements between the inner ring and the outer ring, and its shape, size and quantity directly affect the performance an...

AI Technical Summary

Problems solved by technology

[0013] Since the existing cooling oil mainly adopts No. 46 turbine oil or No. 32 turbine oil, the kinematic viscosity of No. 46 turbine oil at 40°C is 45.8, and its optimal operating temperature range is 44-46°C; The kinematic viscosity at 40°C is 32, and the optimal operating temperature range is 38-40°C; the existing cooling oil needs to be controlled below 65°C during operation. When the temperature of the cooling oil is too high, the viscosity becomes smaller and will Lead to poor lubrication, larger friction coefficient, increased frictional heat generation, rapid rise in oil temperature, and high oil temperature, aggravating the wear of the sliding friction surface; existing bearings adopt this cooling structure, in order to prevent excessive oil temperature from causing wear Watt, it is necessary to monitor the oil temperature in the bearing. When the temperature is too high, it is necessary to increase the water flow of the cooling body. When the temperature is too high, an alarm is given and the operation is stopped.

[0014] Due to the low heat exchange efficiency of the existing hydraulic generator bearings, the generator is prone to alarm shutdown, which not only affects the output efficiency and economic benefits of the power station, but also affects other equipment in the power station during the shutdown and start-up process of the power station. Great impact on service life

[0015] The reason for the above problems is that the density and viscosity of the cooling oil are greatly affected by the change of oil temperature. The higher the temperature of the cooling oil, the smaller the density and viscosity. After the cooling oil is cooled by the cooling copper tube a71, The cooling oil with a larger cooling capacity sinks, and the flow rate becomes smaller, and the cooling oil with a smaller cooling capacity floats up, causing the cooling oil with a larger cooling capacity in the lower area of ​​the second oil chamber a6 to stay, while the cooling oil in the upper area The flow rate of the smaller cooling oil becomes faster and flows out from the oil outlet a62, resulting in the high temperature of the cooling oil flowing out of the oil outlet a62

[0016] In addition, the bearings in the prior art also have the following problems: 1. The oil injection groove inside the support pad is designed at the top, and the inside of the support pad needs to be scraped to form small oil storage pits to improve lubrication. Because the cooling oil in the support tile is brought from the oil injection groove to the small oil storage pit on the sliding friction surface through the rotation of the main shaft, the amount of cooling oil brought in is small, and the cooling oil exchange rate is low, resulting in heat exchange in the bottom area of ​​the...

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