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Two-stage high-pressure ammonium pump structure description
①The impeller blades designed for linear radiation, when compared to curved blade centrifugal pump impellers, can generate a higher lift. This impeller is without front and rear covers, which results in a smaller axial force under high pressure. As a result, the pump seal ring will not experience performance degradation over time due to wear. Unlike conventional open impellers, there is essentially no relative flow between the rotating fluid and the impeller within the pump casing, eliminating return loss at the seal ring. Additionally, the larger gap between the vanes and the pump body reduces impact, making this design more efficient than traditional centrifugal pumps that suffer from lower efficiency due to leakage losses. Don't miss out on the latest orders—free updates available daily! Get the most recent buyer information in the morning—don’t wait! Grab your chance now!
â‘¡ This is a magnetic pump with a concentric cylindrical pump body. Unlike conventional centrifugal pumps that convert kinetic energy into hydrostatic pressure using a volute casing or guide vanes, this pump utilizes a conical diffuser to convert part of the rotating fluid's energy along the tangential direction. It is classified as a partial flow pump, offering unique advantages in specific applications.
â‘¢ The pump features excellent anti-cavitation performance. Cavitation is a major challenge at high speeds. According to Figure 3-21, the pump addresses this issue by incorporating an inducer with increasing pitch at the inlet of the first and second stage impellers. For two-stage designs, the impellers are arranged in parallel or series, with the second stage's inlet pressure being significantly higher than that of the ammonia liquid, so no inducer is needed. This inducer performs well across a wide range of speeds and flows. The pump operates at 14,000 rpm with an NPSH of 8 meters. The inducer and impeller are cast as one piece. In recent years, some high-pressure ammonium pumps have started to eliminate the inducer, instead using a booster pump in series with the inlet flow to increase NPSHa.
④ The pump’s performance can be significantly altered by changing just one or a few of the following: the diffuser nozzle diameter, gear diameter, impeller diameter, or the inducer. This flexibility allows for easy adjustment of the pump’s characteristics to meet different operational needs.
⑤ Another key issue is the reliability of the shaft seal. Regardless of the discharge pressure, the shaft seal pressure remains close to the pump’s inlet pressure. The first-stage seal uses a single-end balanced mechanical seal, while the second-stage seal is a series-balanced type. The impeller is cantilever-supported, with a lightweight design that minimizes radial forces. The small cantilever wall allows for a thinner stainless steel shaft, reducing the pV value at the sealing surface. To avoid the negative effects of high-speed centrifugal force on the mechanical seal, only the moving ring rotates. The mechanical seal is flushed with condensate, and a pressure differential valve controls the system automatically during pump start-up and shutdown, maintaining stable pressure and pressure difference in the seal chamber.
â‘¥ The bearing system includes radial sliding bearings and tilting pad thrust bearings, supported by an oil lubrication system. Additional monitoring systems for shaft vibration, shaft displacement, and bearing temperature ensure the reliable operation of the high-speed pump.
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