Imported double-suction chemical centrifugal pump

The double-suction chemical centrifugal pump is a type of centrifugal pump specifically designed for the chemical industry. It features a double-suction impeller design, with liquid entering the center of the impeller from both sides, effectively balancing axial forces, reducing vibration and noise, and prolonging bearing life. It has the characteristics of large flow rate, high head, stable operation, and strong anti-suction erosion performance, and is widely used in the transportation of chemical raw materials, the treatment of corrosive media, large-flow transportation, and environmental protection treatment, among other fields. Here is an introduction to the double-suction chemical centrifugal pump:
1. Core features
The double-suction impeller is composed of two back-to-back impellers. The liquid enters the center of the impeller from both sides, effectively balancing axial forces, reducing vibration and noise, and prolonging bearing life. The flow rate is larger than that of a single-suction pump (at the same rotational speed and impeller size, the flow rate can be doubled), the head is higher, and it is suitable for transporting high-flow, high-head media. The double-suction impeller with an optimized design and hydraulic model is highly efficient and energy-saving, reducing hydraulic losses and improving pump efficiency (up to 92%). Some models (such as the KQSN series) can reduce energy consumption by more than 20% through energy-saving modifications, significantly reducing operating costs. The strong anti-suction erosion performance is achieved with precisely cast pump casings and smooth impeller surfaces, reducing the occurrence of suction erosion and prolonging the pump's lifespan. When equipped with a self-priming device, it can achieve automatic water intake without the need for a bottom valve or vacuum pump, simplifying the operation process. The key components such as the pump body and impeller can be made of corrosion-resistant materials such as stainless steel (such as 304, 316) or fluoroplastics (such as PTFE), suitable for the transportation of corrosive media such as acids, bases, and salts. The operation is stable and reliable, supported by double-row radial ball bearings, with low noise and long service life. The mechanical seal or packing seal design ensures 8,000 hours of no leakage operation, reducing maintenance costs.
2. Working principle
The liquid is sucked into the motor by the driven impeller rotating, forming a low-pressure area at the center of the impeller. Under the action of the external atmospheric pressure and the pressure difference between the center of the impeller and the outside, the liquid is sucked into the pump body. The double-suction structure enables the liquid to enter from both sides of the impeller simultaneously, improving the suction capacity. The liquid accelerates and enters the impeller, then under the centrifugal force, it moves from the center to the edge of the impeller, increasing speed and pressure. The high-speed and high-pressure liquid enters the discharge chamber of the pump body, converting some kinetic energy into pressure energy, and finally being discharged from the pump body with a higher pressure. The flow channels inside the pump shell gradually expand and decelerate, converting the liquid's kinetic energy into static pressure energy, achieving the conversion from low pressure, low flow to high pressure, high flow.
3. Application fields
Chemical raw material transportation transports various chemical raw materials and media, such as acids, bases, salt solutions, organic solvents, etc. Corrosive medium treatment is suitable for the transportation of corrosive media in the chemical industry, such as sulfuric acid, hydrochloric acid, sodium hydroxide, etc. Large-flow transportation meets the requirements of large-flow transportation in chemical production, such as circulating cooling water, process water, etc. Environmental protection treatment is used for sewage treatment, waste gas treatment, etc. in environmental protection fields, transporting sewage, waste liquid, etc. Other fields include petroleum, pharmaceuticals, metallurgy, power, etc., meeting various fluid transportation needs.
4. Selection suggestions
Determine the flow rate and head according to actual needs to ensure the pump operates in the efficient zone. For example, in urban water supply systems, an appropriate model should be selected based on the population and water demand of the water supply area. The nature of the medium should be selected based on the corrosiveness, viscosity, temperature, etc. of the transported medium. Corrosive media should use stainless steel or fluoroplastics (such as PTFE) pumps. The rotational speed and energy consumption: the higher the rotational speed, the greater the flow rate and head, but the energy consumption is also higher. The actual needs and energy cost should be comprehensively considered. Choose a pump type with a compact structure, convenient installation and maintenance to reduce the later maintenance cost. The pump shell is designed with horizontal split design, making it unnecessary to dismantle the pipeline during maintenance, simplifying the maintenance process.
5. Typical models and parameters Flow range: 130 - 50,000 m³/h; Head range: 8.6 - 220 m; Power range: 1.5 - 3,150 kW; Speed range: 740 - 2,900 r/min; Temperature range: -20°C - 120°C (special models can reach 150°C); Pump body material: WCB, 304, 316, fluoroplastics, etc.
VI. Market Trends
With the advancement of the "carbon neutrality" goal and the upgrading of the manufacturing industry, the double-suction chemical centrifugal pumps are developing towards energy saving, intelligent operation and maintenance, and adaptability to special working conditions. For example:
Energy-saving pump: By optimizing the hydraulic model and material selection, it reduces energy consumption and enhances efficiency. Intelligent monitoring: Integrating sensors and remote monitoring systems, it enables real-time condition monitoring and fault prediction. Specialized for special conditions: Developing pump types suitable for extreme conditions such as high temperature, high pressure, and strong corrosion.