Oil cooling bearing

Abstract

The invention discloses an oil cooling bearing. A bearing cover is located above a bearing block, a bearing bush is fixed to the bearing block, a cooling oil groove in the axial direction is formed in the inner diameter side of the bearing bush, an oil inlet hole is formed in the middle portion of the cooling oil groove, and the two ends of the cooling oil groove are provided with hot oil discharging ways; a bearing cooling structure comprises a cooling cavity and a cooling body, the cooling body is located in the cooling cavity, the cooling cavity is provided with a hot oil inlet and a cold oil outlet, an oil inlet is communicated with the cold oil outlet of the cooling cavity, and the hot oil discharging ways are communicated with the hot oil inlet of the cooling cavity; and the cooling body comprises a cooling pipe, a bottom hole runner separating plate and a top hole runner separating plate, and the bottom hole runner separating plate and the top hole runner separating plate are distributed in the cooling cavity between the hot oil inlet and the cold oil outlet in a spaced manner. The high heat exchange efficiency is achieved, alarm halting caused by too-high oil temperature can be effectively prevented, and the bush abrasion or burning phenomenon caused by the too-high bearing bush and cooling oil can be effectively avoided.

Description

technical field [0001] The invention relates to the field of bearing devices, in particular to an oil-cooled bearing for a hydraulic generator. Background technique [0002] The bearing cooler is one of the important parts of the hydro-generator. Its function is to establish a thermal dynamic balance through the heat exchange between the bearing friction heat and the cooler, and stabilize the temperature of the bearing bush in the normal operating range. [0003] The heat exchange medium used in the existing bearing cooler mainly adopts liquid oil, and the liquid oil circulates through the bearing bush and the cooling part to remove the frictional heat of the bearing bush. [0004] Bearing coolers commonly used in existing hydroelectric generators, such as the attached figure 1 As shown, it includes a cooling oil chamber 101, a cooling body 102, a hot oil inlet 103, a cold oil outlet 104, an edge ring flow channel partition 105 and a central flow channel partition 106, and ...

AI Technical Summary

Problems solved by technology

[0010] Since the existing cooling oil mainly adopts No. 46 turbine oil or No. 32 turbine oil, the optimum operating temperature range of No. 46 turbine oil is 44-46°C, and the optimum operating temperature range of No. 32 turbine oil is 38-40°C ;The existing cooling oil needs to be controlled below 65°C during the operation process. When the temperature of the cooling oil is too high, the viscosity becomes smaller, resulting in poor lubrication, the friction coefficient of the bearing pad becomes larger, the frictional heat generation is intensified, and the oil temperature rises rapidly, and The high oil temperature will aggravate the wear of the sliding friction surface; the existing bearing adopts this cooling structure. In order to prevent the oil temperature from being too high and causing the burning of the shoe, it is necessary to monitor the oil temperature in the bearing. When the temperature is high, it is necessary to increase cooling. When the temperature is too high, it will alarm and stop running

[0011] Because the existing bearing cooler structure generally has the problem of low heat exchange efficiency, the generator is prone to alarm shutdown, which not only affects the output efficiency and economic benefits of the power station, but also affects the use of other equipment in the power station during shutdown and start-up of the power station. Great impact on life expectancy

[0012] The main 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. , the cooling oil with a large cooling capacity sinks, and the flow rate becomes smaller, and the cooling oil with a small cooling capacity floats up, causing the cooling oil with a large cooling capacity in the lower area of ​​the cooling oil chamber 101 to stay, while the cooling oil in the upper area is relatively small The flow rate of the cooling oil becomes faster and flows out from the cooling oil outlet 104, resulting in the high temperature of the cooling oil flowing out of the cooling oil outlet 104

Images