Application of brushless DC automobile electronic circulating water pump in the field of new energy vehicles
In recent years, under the guidance and promotion of national policies, the electric vehicle industry has developed rapidly. Especially since 2014, the domestic market has shown explosive growth. According to statistics from the China Association of Automobile Manufacturers, China's new energy vehicle sales reached 507,000 in 2016, and the cumulative market volume reached 1 million. As an emerging strategic industry in the country's "13th Five-Year Plan", new energy vehicles are expected to be further developed. New energy vehicles are vigorously advocated as an important symbol of green travel. The water circulation, cooling or on-board water supply system is controlled by a very small component-the brushless DC car electronic circulating water pump. It has always been monopolized by large foreign companies. As domestic technology continues to mature, this monopoly has been broken by domestic companies, especially Shenpeng Electronics has invested huge research and development expenses in automotive electronic pumps, and many technologies have led other companies in the industry.
Automotive electronic water pumps, many new energy vehicles, RVs and other special vehicles are often used in micro water pumps as water circulation, cooling or on-board water supply systems. Such micro self-priming water pumps are collectively referred to as car water pumps. Its principle is: the circular motion of the motor makes the diaphragm inside the water pump reciprocate through the mechanical device, thereby compressing and stretching the air in the pump cavity (fixed volume), which is formed at the drain port under the action of the one-way valve Positive pressure (the actual output pressure is related to the boost of the pump discharge port and the characteristics of the pump), a vacuum is formed at the pumping port, thereby creating a pressure difference with the outside atmospheric pressure, under the action of the pressure difference, the water is pressed into the water inlet , And then discharged from the drain, so reciprocating under the action of the kinetic energy transmitted by the motor, the water is continuously sucked and discharged to form a relatively stable flow.
The power of electronic water pumps is relatively small, generally below 1000W, and the motors generally use brushless DC motors. The electronic water pump has many advantages such as compact structure, convenient use, powerful functions, long life, stable performance, low noise, low energy consumption, and high efficiency. Therefore, it is favored by people in the industry. With the rapid development of the industry, the application fields of electronic water pumps are becoming more and more extensive, especially in the field of new energy vehicles.
The new energy vehicle cooling water pump is a mechanical device that accelerates the circulation and cooling of the vehicle coolant. However, the existing vehicle cooling water pumps are usually complex in structure, use more parts, and high production costs. In addition, the existing vehicle cooling water pumps flow The coolant contains a lot of impurities. If these impurities are not removed, the normal operation of the water pump will be affected and the service life of the water pump will be shortened. The traditional impellers currently on the market are generally made of metal materials, which are prone to corrosion and oxidation, easy to damage, and have a short service life.
With the continuous improvement of new energy vehicles' requirements for driving range and light weight, more and more vehicle manufacturers are gradually moving from using air-cooled power batteries to liquid-cooled power batteries, using liquid working fluids. Indirect or direct contact with the heating component through the water channel, absorb the heat and bring it to the external radiator; at the same time, the liquid working fluid in the radiator is cooled by air cooling, and then the cooled liquid working fluid is returned to the inside of the heating component Re-absorb heat. In this way, the electric vehicle water pump appears in the cooling circuit of the power battery, and liquid cooling is the current mainstream cooling method.
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