SU1740717A1 - Cooling system of turbo supercharged internal combustion engine - Google Patents

Abstract

Usage: the invention can be used for cooling systems of turbocharged internal combustion engines. The essence of the invention is as follows: the ICE cooling system contains two pumps 12, respectively, for cooling the engine 1 and the charge air cooler 10, which have branch pipes 8 and 14, respectively, through which the cooling liquid is transferred to the suction 1 or 1 by means of thermostatic valves .

Description

The invention relates to mechanical engineering, namely to closed systems of liquid cooling of internal combustion engines with supercharging.

An internal combustion engine with a closed liquid cooling system is known, comprising a coolant circuit comprising a series-connected engine cooling jacket, exhaust manifold cooling cavities, a thermostat, an oil cooler, a radiator and a circulation pump, the suction cavity of which is connected to the radiator, and the pressure - to the cooling jacket, and the charge air cooling circuit, which includes a charge-cooler, a second radiator and a water radiator connected in series, second pump, a suction chamber which is connected to the second radiator and the thrust - to the charge air cooler. The system also includes a fan with a hydraulic coupling, the filling of which is regulated by a thermostat installed in

coolant circuit.

A disadvantage of the known system is the inefficient operation of water pumps of both circuits in cooling when the diesel engine is idling and at low loads.

The aim of the invention is to increase efficiency.

This is achieved by the fact that the cooling system additionally contains two thermostatic valves, the first of which is installed in the circulating pump of the coolant circuit, and the second in the water pump of the charge air cooling circuit, and the suction and discharge cavities of each of the pumps through appropriate thermostatic valves.

The drawing is a schematic diagram of a turbocharged internal combustion engine cooling system.

The cooling system contains a coolant circuit and a circuit (L

WITH

four

Ј

ABOUT

4J

charge air cooling tour. The coolant circuit includes serially connected engine cooling jacket, cooling cavity of exhaust manifold 2, thermostat 3, oil cooler 4, radiator 5 and circulation pump 6 with thermostatic valve 7 and bypass channel 8. Suction cavity of pump b is connected to radiator 5 and pressure through the thermostat 9 to the engine cooling jacket 1. The charge air cooling circuit includes the charge air cooler 10 connected in series, the second radiator 11 and the water oh pump 12 with a thermostatic valve 13 and a bypass channel 14. The suction cavity of the pump 12 is connected to the radiator 11, and the pressure is connected to the charge air cooler 10. Moreover, the suction and pressure cavities of the pumps b and 12 are through the bypass channels 8 and 14 and thermostatic valves 7 and 13 are linked together. The cooling system also includes a turbo compressor 15, a fan 16 with a hydraulic drive coupling 17, and a system of water and air pipelines.

The system works as follows.

When starting the cold engine, the thermostatic valves 7 and 13 of the circulation pumps 6 and 12 are open and the main part of the coolant circulates through the bypass channels 8 and 14 from the discharge cavity of the pumps into the suction cavities. The second part of the coolant in the coolant circuit enters the cooling of the engine 1 and circulates in a closed loop through the radiator 5, the circulation pump b and back into the engine. At the same time, part of the fluid from the engine enters the thermostatic valve 7 and further into the suction cavity of the pump 6. In the charge air cooling circuit, a second small part of the coolant flows into the charge air cooler 10 and, after cooling the charge air coming from the turbocharger 15, circulates a closed loop, passage radiator 11, circulation pump 12 and back to the cooler 10. In this case, part of the charge air from the turbocharger 15 enters the thermostatic valve 13 and further together with the cooled air in the cooler 10 flows into the suction manifold 18 of the engine 1. In this case, the fan 16 is disabled.

As the engine warms up and the coolant temperature rises and

charge air thermostatic valves 7 and 13 gradually cover the bypass channels 8 and 14 up to complete shutdown at the nominal mode of the engine when all the cooling fluid pumped by pumps 6 and 12 is supplied to the engine 1 and, accordingly, the charge air cooler 10.

When the load increases and the thermal condition of the engine is disturbed, the thermostat 3 is activated, opening oil access from the lubrication system (not shown) to the hydraulic coupling 17 and turning on the fan 16 on

cooling of radiators 5 and 11. At the same time, the coolant from the circulation pump 6 through the thermostat 9 is supplied to cool the oil cooler 4. When switching to partial load or idling, the temperature of the cooling fluid leaving the engine, and the charge air leaving the turbocharger 15 is reduced. Thermostatic valves 7 and 13 are activated and begin to bypass part of the coolant through the channels 8 and 14, maintaining the temperature mode corresponding to the mode of operation at rated power. This leads to a decrease in

the cost of power to drive pumps 6 and 12 and increase engine efficiency.

Thus, the system provides high cooling efficiency for forced motors with a closed cooling system.

Claims (1)

Invention Formula A turbocharged internal combustion engine cooling system containing a coolant circuit including an engine cooling jacket connected in series, an exhaust manifold cooling cavity, a thermostat, an oil cooler, a radiator and a circulation pump, the suction cavity of which is connected to the radiator, and the pressure regulator to shirt cooling circuit, the charge air cooling circuit, which includes a series-connected charge air cooler, a second radiator and a water pump, the suction cavity of which is connected to the second radiator, and the pressure head to the charge-air cooler, characterized in that, in order to increase efficiency, it additionally contains two thermostatic valves, the first of which is installed in the circulation valve 517407176 the pump, and the second in the water pump, the pumps being interconnected through corresponding suction and pressure cavities of both thermostatic valves. //