During the repair process of automotive air conditioning systems, the vacuum pump is equally indispensable. When an auto AC system experiences issues like poor cooling performance, technicians first use a vacuum pump to perform vacuum testing and repairs on the system. For instance, in a car whose air conditioner had been running for three years but was now producing insufficient cooling, technicians discovered significant amounts of air and moisture inside the system after conducting a vacuum test. After thoroughly evacuating the system and replenishing the refrigerant, the AC’s cooling efficiency returned to normal—saving the车主 substantial costs that would have been incurred by replacing entire system components.

In the field of automotive engine manufacturing, casting processes play a decisive role in determining the quality of critical components such as engine blocks and cylinder heads. Vacuum pumps are an indispensable part of this process. Before adopting vacuum casting technology, engine block castings produced during automobile engine manufacturing often suffered from internal porosity and sand inclusion defects, with defect rates as high as 15%. These imperfections can severely impact engine performance—leading to reduced power output, increased fuel consumption, and even potentially causing engine failures during operation.

To address this issue, the company introduced a specially designed vacuum pump with an exceptionally high pumping capacity. Inside the casting mold, the vacuum pump quickly establishes a near-perfect vacuum environment, typically achieving a vacuum level below 100 Pa. By efficiently evacuating gases from the cavity, molten metal flows into the mold more smoothly and evenly, significantly reducing internal defects in the castings. After implementing vacuum casting technology, the company managed to reduce the defect rate of its engine cylinder blocks to within 3%, leading to a remarkable improvement in product quality. Moreover, engine performance has also seen a substantial boost—resulting in enhanced power output stability and an approximately 8% improvement in fuel efficiency—thereby strengthening the product's competitiveness in the market.

5.2 Automotive Brake System Operating Conditions

(1) Conventional gasoline-powered vehicles

In traditional fuel-powered vehicles, the vacuum booster is a critical component that enhances braking performance. It leverages the vacuum generated in the engine's intake manifold to assist the driver during braking maneuvers. Under normal conditions, the vacuum level in the engine’s intake manifold typically ranges from -0.06 MPa to -0.08 MPa. When the driver presses the brake pedal, the vacuum booster taps into this vacuum to produce a powerful assist, making braking significantly easier. For instance, in a common family sedan, without a vacuum booster, the driver would need to apply approximately 500 N of force to achieve effective braking. However, with a vacuum booster installed, the same braking effect can be achieved by applying just about 100 N—dramatically reducing the physical effort required and easing the driver’s workload. At the same time, the vacuum booster ensures a more responsive braking action, shortening the overall stopping distance. In emergency braking situations, the vacuum booster can further reduce the stopping distance by roughly 10% to 15%, providing an added layer of safety and peace of mind for drivers on the road.

(2) New Energy Vehicles

With the rise of new-energy vehicles, specialized electric vacuum pumps have become a critical component of the braking system—since these vehicles lack an engine to provide a stable vacuum source. Take, for instance, a certain pure electric vehicle model, which is equipped with an electric vacuum pump capable of boosting the brake system’s vacuum level to over -0.08 MPa within a very short time. During an actual test, when the vehicle was traveling at 80 km/h and suddenly encountered emergency braking, the electric vacuum pump immediately kicked into action, ensuring the braking system quickly reached the required vacuum level. As a result, the car came to a smooth stop within a safe distance, delivering braking performance comparable to that of conventional gasoline-powered vehicles. This clearly demonstrates the reliability and vital role of the electric vacuum pump in the braking systems of new-energy vehicles.

5.3 Operating Conditions of Automotive Air Conditioning Systems

In the production and maintenance of automotive air conditioning systems, the role of the vacuum pump is crucial. During the manufacturing process, once the car's air conditioning system is fully assembled, it must undergo a vacuuming procedure. For instance, an automotive air conditioning manufacturer uses a vacuum pump capable of achieving a pumping speed of up to 50 liters per second. This vacuuming process effectively removes air and moisture from the system. If residual air remains inside, it can disrupt the smooth circulation of refrigerant, reducing cooling efficiency. Meanwhile, any trapped moisture could freeze in low-temperature conditions, potentially damaging critical components of the air conditioning system. After thorough vacuuming, the system achieves a vacuum level below 10 Pa, ensuring proper refrigerant circulation and boosting the overall cooling performance of the air conditioning system by approximately 20%.

During the repair process of automotive air conditioning systems, the vacuum pump is equally indispensable. When an auto AC system experiences issues like poor cooling performance, technicians first use a vacuum pump to perform vacuum testing and repairs on the system. For instance, in a car whose air conditioner had been running for three years but was now producing insufficient cooling, technicians discovered significant amounts of air and moisture inside the system after conducting a vacuum test. After thoroughly evacuating the system and replenishing the refrigerant, the AC’s cooling efficiency returned to normal—saving the车主 substantial costs that would have been incurred by replacing entire system components.

5.4 Surface Treatment Conditions for Automotive Components

In the surface treatment processes for automotive components, vacuum coating technology is widely used to enhance both the aesthetic quality and protective performance of parts. Take the vacuum coating of car wheel hubs as an example: a leading automotive component manufacturer employs a vacuum pump to create an environment with a vacuum level ranging from 10⁻³ Pa to 10⁻⁴ Pa. In this ultra-high vacuum setting, the coating material can be evenly deposited onto the hub’s surface. As a result, wheel hubs treated with vacuum coating not only boast a more dazzling appearance—showing a roughly 30% improvement in gloss—but also exhibit superior corrosion and wear resistance. When subjected to simulated acid rain and humid environment tests, the vacuum-coated hubs demonstrated corrosion resistance that lasted more than twice as long compared to uncoated counterparts, significantly extending the lifespan of the wheels and ultimately boosting the overall quality of automotive components.