SU498915A3 - Device for cooling diesel - Google Patents

Description

heat exchangers 7, 14, to the radiator 27 and 28 are again discharged into the tank 20. The impulse tube 29 serves to connect the charge pressure sensor to the discharge part of the compressor 4.

The thermostat is a thermostatic capsule 30 connected to the valve 31. As the coolant temperature decreases, the length of the capsule decreases and the valve narrows the flow area for the refrigerant. With a given minimum value of the refrigerant temperature, for example at i85 ° C, the cross section can be completely covered. As the temperature of the refrigerant rises, the thermostatic capsule lengthens and the cross-section for the passage of the refrigerant increases.

The throttle body is also made in the form of a valve 32 connected to a pressure gauge diaphragm 33. Under the action of the force of the boost pressure and the elastic force of the spring 34 balancing it, the diaphragm moves and moves the valve 32. The ratio between the area of the diaphragm and the elasticity of the spring can be chosen in any way. it can be fully closed at a pressurization pressure below 0.1 kg / cm and fully open at a pressure of 0.3 kg / cm and higher.

The radiator 27 is blown by air sucked into the duct 35, forming the inlet cone of the pipe 36, ending with a diffuser 37. The air is sucked into the duct under the influence of the ejecting effect created by the exhaust gases flowing from the outlet 38 of the turbine 3 tangentially into the annular channel 39 and from there into the pipe 36 through the nozzle apparatus formed by the blades 40.

The cross sections of gas pipelines and vanes are selected from the condition of providing minimum back pressure behind the turbine and ensuring maximum effect of damping noise. Mixing exhaust gases with air reduces the opacity of the exhaust.

With increasing power and a corresponding boost pressure increase, the throttle body increases the cross section for passage

refrigerant and increases heat removal in heat exchangers. As this increases the amount of exhaust gases, the ejecting effect increases, more air flows through radiator 27, and an increased amount of heat is released into the air. The system provides a lower value of the temperature of the charge air.

With decreasing power, it is advisable to increase the temperature of the charge air. The described device achieves the desired effect, since with a decrease in the pressure of the pressurization, the throttle body is closed, and the thermostat provides a change in the cross section of the branch 22 in which it is installed, in accordance with the specified temperature range. For example, at temperatures below 85 ° C, the cross section for the passage of the refrigerant can be completely blocked.

Thus, the implementation of the line with two parallel branches, one of which has a thermostat, and the other, a throttle body connected to the boost pressure sensor, ensures accurate control of the charge air temperature and maintain it in a predetermined range for each engine operation mode.

If greater control accuracy is not required, for example, when a free turbocharger is pressurized, the throttle body and branch 23 can be excluded.

Subject invention

A device for cooling a diesel engine containing heat exchangers for charge air and oil connected in series to the refrigerant supply line, equipped with a thermostat and a throttle body connected to the charging pressure sensor, characterized in that, in order to improve the accuracy of controlling the temperature of the charge air, the refrigerant supply line is made with two parallel branches, and the thermostat is installed in one of them, and the throttle body in the other.

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