(1) pump
1. Function and structure: The function of the small excavator water pump is to pressurize the cooling water and make it circulate in the cooling system.
The pump is driven by gears, and the pump speed is 1.5 times that of a diesel engine.
2 Working principle: When the pump impeller rotates, the coolant pump rotates together through the impeller, and is pushed to the edge of the pump casing by centrifugal force, and then reaches the outlet pipe through the outer tangent of the impeller. The casing. The engine water jacket is inside. At the same time, the impeller The central pressure is reduced, and the coolant in the radiator tube is sucked into the pump chamber through the inlet, and the coolant circulates throughout the cooling system.
(2) Thermostat
1 Function and structure: The function of the thermostat is to automatically control the flow and circulation path of the coolant according to the working temperature of the engine.
2 Working principle: when the temperature is low, the paraffin is solid, the main valve spring presses the main valve on the valve seat, and it is in a closed state. At this time, the auxiliary valve opens, and the coolant goes through a small cycle.
