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Cummins diesel engine water pump (freshwater seawater pump assembly)


Detailed Description:

Cummins diesel engine water pump (freshwater seawater pump assembly) physical map and parameter models are for reference only: For specific price models, please contact our sales online customer service,

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Cummins diesel engine cooling system (water pump)

two. Cooling system composition

It consists of radiator, water pump, cylinder block water channel, cylinder head water channel, water outlet pipe, thermostat, water filter, intercooler, oil cooler, and optional air compressor and hydraulic oil cooler.

Cummins engine cooling system--water pump

All Cummins engines use centrifugal pumps.

1. Composition: water pump body, water pump shaft, impeller, bearing, seal, volute

2. Working principle: The core coolant is thrown to the outer circle by the rotation of the impeller, forming negative pressure to absorb water in the core of the impeller, and forming positive pressure in the outer circle of the impeller, which pumps water through the volute.

3. Pump inspection and maintenance: Use observation holes to check the working conditions of water seals and oil seals, and replace the corresponding seals when necessary.

The main task of the engine cooling system is to maintain the normal operating temperature of the working engine. During the operation of the engine, part of the heat generated by gas combustion is inevitably transferred to the engine block, so that the temperature of the engine block increases, the inflation coefficient decreases, and the power of the engine is affected. At the same time, excessive temperature will reduce the viscosity of the lubricant Causes poor lubrication of the engine; the high temperature makes the fitting clearance between the components too small and affects the normal operation of the engine, so the engine must be properly cooled. The engine temperature is too low, which is also detrimental to the normal operation of the engine. The cooling strength of the engine can be adjusted according to the operating temperature of the engine to maintain a suitable operating temperature of the engine.

The composition and working principle of Cummins cooling system

Water pump: The water pump pressurizes the coolant to maintain rapid circulation in the cooling system. The engine uses a centrifugal water pump with a simple structure, small size and large displacement.

(1) Working principle of centrifugal water pump: Centrifugal water pump is composed of pump body, impeller and water inlet and outlet pipes. The water inlet pipe is located at the center of the water pump, the water outlet pipe is located at the outer edge of the water pump, and the impeller is rotated by external force. When the impeller rotates, the coolant in the water pump rotates and pressurizes with the impeller. Under the action of centrifugal force, it is thrown out to the edge of the impeller, and the water pump is output through the water outlet pipe. Due to the pressure reduction at the center of the impeller, a vacuum suction force is generated, and the cooling liquid in the radiator is continuously drawn into the water pump.

Cummins engine water pump structure: The pump casing is divided into two parts: a pump cavity and a bearing housing hole. The impeller located in the pump cavity is fixed to the pump shaft, and the pump shaft is supported in the bearing housing hole of the pump casing through two bearings. A water seal is provided between the pump cavity and the bearing housing hole to prevent the coolant in the pump cavity from leaking along the pump shaft into the bearing housing hole. The axial positioning and fixing of the pump shaft is achieved through a radial thrust bearing. The inner side of the inner ring of the inner bearing bears against the shaft shoulder. An isolation sleeve is provided between the two inner rings of the bearing. The inner side of the flange flange of the pulley mounted on the pump shaft against the inner ring of the outer bearing is fixed by a nut. Water pump shaft. The above structure allows the inner ring of the two bearings to be fixed on the pump shaft. The outer ring of the inner bearing is positioned by the shoulder of the pump casing to prevent the pump from moving axially and inward. The outer ring of the outer bearing is fixed in the housing by a snap ring to prevent the pump. Move axially up and out.

Installation and connection of water pump: The water inlet pipe of the water pump communicates with the radiator drain chamber through a hose, and the coolant directly enters the central part of the water pump chamber. A pipe joint is installed at the central part of the water pump, and communicates with the auxiliary valve of the thermostat through a bypass pipe. The coolant flowing from the auxiliary valve directly enters the pump chamber through this pipe joint. The rear side of the pump chamber is closed with a pump cover, and the water outlet on the pump cover is directly opposite the water chamber of the pump chamber. After the water pump is fixed to the engine, the water outlet on the pump cover is connected with the water inlet of the water pipe of the water jacket. A drain hole is provided between the oil seal of the pump casing and the bearing seat hole, and when a small amount of water droplets leak from the water seal, it can be leaked from the hole. If water still leaks after the engine has stopped, the water pump should be disassembled for repair.

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