Double stage cone vacuum pump (power plant special)

vacuum pump(electricity)

The two-stage conical vacuum pump, a cutting-edge energy-saving product developed by our company, represents international industry standards. This innovative design delivers exceptional performance with large suction capacity, energy efficiency, safety, extended service life, and superior operational flexibility. Featuring a conical structure, its intake and exhaust ports are significantly larger than those in conventional horizontal pumps. This configuration allows the pump to effectively handle gas entrained with liquid without compromising efficiency. The enhanced design enables condensation nozzles at the inlet to condense non-condensable components from the gas stream, dramatically reducing the total gas volume. This breakthrough not only boosts pumping capacity but also delivers substantial economic benefits for power plants through optimized energy utilization.

Description of the effect of impeller material on cavitation resistance:

Vapor Emission Formation: The high vacuum in a vacuum pump causes vaporization of sealed water, forming bubbles that adhere to the impeller surface. As pressure in the exhaust zone increases, these bubbles rupture. Surrounding liquid particles then collide with the bubble's core at extreme velocities, creating instantaneous shock waves. Under such vacuum conditions, repeated bubble formation and collapse generate intense impact forces on the impeller surface. Over time, this results in honeycomb-like pitting on the impeller surface, potentially causing perforations or fractures. Concurrent pump vibrations, abnormal noises, and significantly reduced efficiency characterize this vapor erosion phenomenon.

Material effects:

Although two-stage compression is employed in power plant vacuum pumps, the impact of impeller material on cavitation resistance cannot be overlooked. Research from domestic and international institutions indicates that material properties such as plasticity, toughness, and impact resistance—particularly the latter—stand out as crucial factors in cavitation prevention.

Through years of practical application and theoretical research, it has been proven that all power plant two-stage volute vacuum pump impellers currently use ductile iron. While stainless steel impellers demonstrate superior corrosion resistance compared to ductile iron ones, they exhibit distinct advantages in cavitation resistance. As shown in the table above, stainless steel exhibits significantly better plasticity and impact resistance than ductile iron, meaning its cavitation resistance performance far surpasses that of ductile iron impellers. Practical experience also confirms that stainless steel impellers have a lifespan several times longer than those made of ductile iron.

The cast iron impellers used in Shanghai Wu Jing No.2 Power Plant suffered severe cavitation issues and were subsequently replaced with stainless steel alternatives. The stainless steel impellers installed by our company at Huadian Harbin No.3 Power Plant have been in service for ten years. While using cast iron impellers could significantly reduce production costs for vacuum pumps, this approach compromises their cavitation resistance and shortens service life—particularly in regions with high plant water temperatures—which adversely affects the long-term stable operation of vacuum units. Adhering to our quality-first philosophy, we exclusively employ stainless steel materials for critical components including impellers. Coupled with a dual-stage pump design, these measures ensure the equipment maintains reliable and safe performance over extended periods.

When applied in the vacuum extraction of power plant condensers, cone vacuum pumps have the following remarkable features compared with vacuum pumps produced by other manufacturers:

(1) The two-stage vacuum pump completely solves the biggest hazard of "cavitation damage" in power plants. For example, the use of stainless steel impeller is a vacuum pump without cavitation.

(2) The two-stage vacuum pump adopts a two-stage design to reduce the compression ratio, prevent bubble rupture and effectively reduce cavitation damage.

(3) The unique cone design can discharge bubbles from the vacuum pump. Prevent bubble rupture and reduce cavitation generation.

(4) The unique cone design of the vacuum pump, so the starting current is small, more energy saving.

(5) The cone pump shaft is under the minimum force, and the service life of the shaft and bearing is longer.

(6) The cone pump impeller is more solid and the actual service life is longer.

Our company's vacuum pumps are highly efficient, energy-saving and reliable. Our meticulous production guarantee makes our products have the lowest cost in power plants. As for fixed asset investment such as equipment, the total cost is the sum of procurement cost and use cost (operating cost.