I. The working principle of the air cooler:

        Air cooler is a kind of cooler, characterized by using air as the medium of heat exchange for heat exchange, heat is taken away through the air, so it is also called air cooler. When the high-temperature hydraulic oil enters the oil channel in the core body of the air cooler, the heat of the hydraulic oil is rapidly transferred to the aluminum alloy core body with good thermal conductivity. The core body mainly consists of a collector tube, oil channel, wind channel, air from the wind channel at high speed, forced to take away the heat, so that the temperature of the hydraulic oil to reduce. Such a continuous cycle, until the system thermal balance, so that the temperature of the hydraulic oil control in the permissible range. Generally speaking, the heat dissipation effect of the air cooler mainly depends on the heat exchange area and air volume of its component radiator, simply: the same heat exchange area, the larger the air volume the better the heat dissipation effect, the same air volume, the larger the heat exchange area, the better the heat dissipation effect. In the customary name, it is also called oil cooler or air-cooled oil cooler, aluminum alloy plate-fin air cooler.

 2.Second, the main factors that cause air cooler leakage are as follows:

1、Installation of filters at the outlet of the air cooler Do not advocate the installation of filters at the outlet of the air cooler, if the filter is not checked and cleaned up for a long time, resulting in excessive back pressure or blockage of the return oil.

2, low-temperature start-up oil viscosity increases in the winter is prone to this situation, due to the viscosity of the oil becomes larger, the return oil is not smooth, resulting in oil channel pressure greater than 3.5Mpa, easy to burst.

3, the failure of the electrical control components or abnormal oil return oil flow suddenly increased, the flow rate is greater than 0.5m / s, resulting in radiator burst.

4, flow selection unreasonable flow calculation cooler work flow = pump flow × cylinder effective area ratio × oil flow coefficient × safety factor where: cylinder effective area ratio = rodless cavity pressurized area ÷ rod cavity pressurized area (＞ 1) of different viscosity hydraulic oil flow coefficient K: K32 # = 1, K46 # = 1.3, K68 # = 1.9 Safety Factor: 1.5 ~ 2.0, often take 1.8

5、No effective bypass circuit When using the return oil cooling installation method, an effective bypass circuit must be installed. Check valve pressure <0.5Mpa, and to ensure that the check valve can be released priority, piping caliber with the size of the inlet and outlet, can not be changed and reduced, as far as possible, the use of high-pressure hoses and direct head to reduce the resistance to oil return.