Introduction to Submersible Pumps
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Submersible pumps are a type of pump where the pump and the motor are integrated and operate simultaneously underwater.
It is mainly used for transporting media such as sewage, wastewater, rainwater, etc. that contain solid particles and fibers. It can effectively transfer these liquids from one place to another.
I. Classification of Submersible Pumps
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1. Classified by working principle and water flow direction: This is the most fundamental technical classification, which determines the performance characteristics of the pump.
Centrifugal submersible pump
Working principle: The centrifugal force generated by the high-speed rotation of the impeller is utilized to expel water, thereby creating pressure and flow.
Features: High head, wide flow range. It is the most widely used type.
Applicable scenarios: deep well water extraction, high-rise water supply, farmland irrigation, etc.
(2) Axial-flow submersible pump
Working principle: Once the water enters, it flows axially along the impeller, similar to the propeller of an airplane.
Features: High flow rate, low head.
Applicable scenarios: High-flow drainage, rainwater discharge, water intake from rivers, etc.
(3) Mixed-flow submersible pump
Working principle: It lies between centrifugal and axial flow types. The direction of water flow forms a certain angle with the axis of the impeller.
Feature: It takes into account both flow rate and head, and has high efficiency.
Applicable scenarios: irrigation and drainage in farmlands, industrial circulating water, urban drainage, etc.
2. Classification by purpose and structural characteristics: This is the most commonly used method of market classification, directly corresponding to different usage scenarios.
(1) Clearwater submersible pump
Feature: It is used to extract clean water bodies free of solid particle impurities.
Application: Domestic water supply, garden irrigation, water tower water delivery, fountains, etc.
(2) Sewage submersible pump / Sewage discharge pump
Non-clogging sewage pump: Capable of handling larger solid particles.
Cutting knife sewage pump: Equipped with a built-in cutting system, it can shred fibers, plastics and other debris.
Features: Equipped with a homogenizing, cutting or swirling impeller, it can convey wastewater containing solid particles, fibers and other impurities.
Sub-segment applications: Drainage for construction projects, municipal sewage treatment, and wastewater discharge from factories.
(3) Deep well submersible pump
Features: Long and slender in shape, with multiple-stage impellers connected in series, designed to extract groundwater from deep wells, with extremely high head.
Application: Rural drinking water, mine precipitation, industrial deep well water extraction.
(4) Sea water submersible pump / Corrosion-resistant pump
Features: The flow-through components are made of stainless steel, bronze or special composite materials, and possess excellent resistance to seawater corrosion and wear.
Applications: Desalination of seawater, marine platforms, dock drainage, pumping in coastal areas.
(5) Mine submersible pump
Features: The design is robust and usually adopts an explosion-proof structure, capable of coping with harsh mining environments and transporting muddy water containing slag and sand.
Application: Mine drainage, flood rescue, emergency drainage.
Factors affecting prices
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1. Core performance parameters (hard indicators): Power and head/flow rate; These are the basis for determining the price, directly related to the "capacity" of the pump.
Power: The greater the power, the higher the cost of the motor, and the more expensive the price.
Head: The higher the head, the more stages of impellers or a better hydraulic model are required, the manufacturing process becomes more complex, and the price significantly increases.
Flow rate: The greater the flow rate, the larger the pump body structure size and the flow passage components, more material consumption, and higher price.
In summary: Pumps with high head, large flow rate, and high power will inevitably have a higher price.
2. Pump body material and process (quality core): Material grade; The material directly determines the lifespan, reliability, and applicable medium of the pump.
Engineering plastics: The lowest cost, suitable for mild corrosion or clean water bodies.
Cast iron: Market mainstream, high性价比, suitable for general clear water and sewage, but poor corrosion resistance.
Stainless steel： Higher price, good corrosion resistance, long lifespan. Among them, 304 stainless steel is suitable for most environments, 316 stainless steel has a higher price and is suitable for seawater and strong corrosive media.
Special alloys/copper： Expensive, used in special industrial and marine engineering in extreme corrosive environments.
3. Technical type and brand premium： Brand value;
International first-line brands： Such as Grundfos, Schlaich Bergermann, KSB, etc., due to their advanced technology, high reliability, and global service system, the price has a significant premium.
Domestic well-known brands： Such as Xinjie, Liou, etc., with high性价比, quality and service are guaranteed.
Small and medium-sized manufacturers： Low price, but the quality and after-sales service may vary.
4. Application scenarios and special design： Types of pumps;
Clear water pump < sewage pump < deep well pump < corrosion-resistant pump/mine pump.
Sewage pumps have a higher price than pumps with the same parameters due to the need for anti-clogging design and stronger flow capacity.
Deep well pumps have a higher price due to the multi-stage structure. Special-purpose pump designs and manufacturing are difficult, and the price is the most expensive.
5. Special design and certification： Explosion-proof certification;
Used in dangerous environments such as mines and oil fields, special design and certification are required, and the price is high.
Efficient energy-saving certification： Such as China's energy efficiency label, pumps with a grade of first-level energy efficiency have better motor and hydraulic model, and the price is also higher, but they consume less electricity in the long run.
6. Market and supply chain factors： Origin and supply chain;
Pumps produced domestically (especially in industrial clusters such as Wenzhou Ling) have obvious cost advantages.
Original imported pumps need to bear tariffs, freight, etc., and the price is higher.
The future market price trend of submersible pumps
Demand growth impetus
Urbanization accelerates: The global urban population is increasing, and the construction / improvement of drainage systems becomes a necessity, especially in emerging economies where the demand is rising.
Environmental protection requirements are escalating: The standards for wastewater discharge are becoming stricter, and as a key equipment in sewage treatment, the demand for submersible pumps is also increasing simultaneously.
Expansion of industrial demand: The expansion of industrial scale and the increase in irrigation demand for farmland have driven its application in the fields of industrial wastewater and agricultural sewage treatment.
2. Expansion of market size
Global: The market size increased from 10 billion US dollars in 2015 to 15 billion US dollars in 2019, and is expected to reach 20 billion US dollars by 2025.
China: Widely applied in fields such as municipal services, factories, commerce, hospitals, and residential areas, with a steadily growing market.
3. Expansion of application fields
In addition to traditional municipal and industrial wastewater treatment, it has also expanded to cover scenarios such as mine drainage, subway drainage, civil defense projects, livestock farm wastewater discharge, and rural irrigation.
The development trend of submersible pumps
1. Direction of Technological Innovation
Intelligentization: Incorporation of remote monitoring, automated operation, and fault diagnosis systems to enhance operational convenience and efficiency;
High efficiency and energy saving: Optimized impeller design, adoption of new type of motor, reduction of energy consumption, meeting the requirements of energy conservation and emission reduction.
Material upgrade: Utilize corrosion-resistant/maintenance-resistant materials such as stainless steel, fluoroplastic, and ceramic, which are suitable for harsh working conditions, thereby extending the service life.
Sealing improvement: Upgrade the mechanical sealing technology to reduce leakage and ensure long-term operational stability.
2. Product diversification
Medium and large-sized pumps: Meeting the requirements of large-scale sewage treatment stations, some axial flow pumps can have a flow rate of several thousand cubic meters per hour;
Multifunctional pump: A pump with special functions such as cutting device, resistant to strong corrosion, ultra-lightweight and large flow capacity, suitable for complex working conditions.
3. Quality and Service Optimization
Quality improvement: Strengthen quality control and performance testing, reduce the occurrence of faults, and lower maintenance costs;
Brand and Service: The enterprise strengthens brand building, improves service quality, and enhances market competitiveness.
