An important part of the cooling system of small excavator

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An important part of the cooling system of small excavator

(1) Pump

1. Function and structure: The function of the small excavatorpump is to pressurize the cooling water and circulate it in the cooling system.

The pump is driven by gears and the pump speed is 1.5 times that of a diesel engine.

2 Operation principle: When the pump impeller rotates, the coolant pump rotates through the impeller, and is pushed to the edge of the pump shell by centrifugal force, and then arrives at the outlet pipe through the outer tangent of the impeller. Housing. Engine water jacket inside. At the same time, the central pressure of the impeller decreases, and the coolant in the radiator tube is sucked into the pump chamber through the inlet, and the coolant circulates in the entire cooling system.

(2) Temperature controller

1 Function and structure: The function of the thermostat is to automatically control the flow and circulation path of the coolant according to the operating temperature of the engine.

2 Working principle: When the temperature is low, the white wax solid, the main valve spring will press the main valve on the seat, in a closed condition. At this point, the auxiliary valve is opened and the coolant passes through a small cycle.

When the temperature rises, it gradually melts into liquid white wax, expands in volume, and an upward thrust occurs at the end of the push rod. Because the push rod is fixed on the support, move the thermostat housing down, the main valve is opened, and the auxiliary valve is started. Closed. When the temperature exceeds a certain value, the main valve is completely opened, and the auxiliary valve also closes the pulmonary circulation channel. At this point, the cooling water of the cylinder jacket is circulated through the radiator. Some ways of circulating water cooling system are put forward.

When the engine coolant temperature is in the large and small cycle temperature range, the main valve and auxiliary valve parts of the thermostat are opened, together, there are large and small conditioning engine coolant temperature to make it appropriate temperature stability. Large cycle: When the engine coolant rises to a certain temperature, the main valve of the thermostat is completely opened and the auxiliary valve is closed. Through the thermostat and radiator coolant inlet hose into the radiator. In the radiator, the coolant cooled to the radiator surrounds the air for cooling and then returns to the pump through the radiator's coolant outlet hose.

Small cycle: When the engine coolant temperature is low, the thermostat of the main valve is closed, and the auxiliary valve is opened. After the pressure action of the pump, the coolant flows through the cylinder block water jacket wall, absorbs heat from the water jacket wall, and then moves the cylinder head water jacket upward, and then sucks out from the cylinder head through the thermostat. Heat the jacket wall. Then return to the pump.

Measure the test parameters of 3J05E thermostatic valve, record the following data, and determine whether the values are correct.

Measure the initial temperature of thermostatic valve opening. The specification for the open temperature of the thermostat valve is 74.5 to 78.5 degrees.

Measure the temperature valve, the rise of the small small excavator, the temperature of the external valve of the thermostat is completely opened, and the test temperature is 95 degrees.

C. Temperature controller test specification.

(3) Radiator

The role of the radiator is to transfer the heat absorbed by the coolant to the outside air, and then reduce the temperature of the coolant.

The structure of the radiator consists of an upper water, a launching chamber, a radiator core, a radiator cover and a drain switch.

The function of the radiator cover is to seal the water cooling system and regulate the operating pressure of the system.

(4) Cooling fan

The role of the cooling fan is to suck in air and pass it past the radiator as the fan rotates.

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