It is very important to choose the right pumping equipment to ensure efficiency, stability and cost-effectiveness for large-flow water delivery scenarios such as municipal water supply and drainage, agricultural irrigation and industrial water transportation. Among all kinds of existing pumps, the submersible axial flow pump is outstanding for its compact structure, large flow rate and energy-saving performance. But there are so many choices in the market. How do you choose a product that meets your actual needs and provides long-term value? In this paper, the QZ series submersible axial flow pump, a high-performance solution to solve the core pain points of water transfer projects, will be discussed in depth, and why it has become the first choice for professionals in many industries.
What is a Submersible Axial Flow Pump?
It is necessary to clarify the definition of a submersible axial flow pump before studying the details of the QZ series. According to the American National Standards Institute (ANSI), a submersible axial-flow pump is a centrifugal pump. The whole device is immersed in the pumped fluid, and the axial-flow impellers are used to push the fluid parallel to the pump shaft to generate the flow. Different from the traditional horizontal or vertical pumps, which need complex ground pump houses, submersible axial-flow pumps integrate the motor and pump body into a unit, without large-scale civil engineering, and reduce the installation and maintenance costs.
An axial flow pump, in general, is characterized by its ability to handle large flow rates at low to medium heads, making it ideal for applications where high-volume water transfer is required without significant elevation changes. As a professional manufacturer of axial-flow pumps, based on years of industry experience and technical accumulation, we have optimized the QZ series by combining advanced design concepts with practical application requirements, so as to create a product with excellent performance, reliability and cost efficiency.
Main Technical Parameters of the QZ Series Submersible Axial Flow Pumps
There are many models of QZ series submersible axial flow pumps, and each model is suitable for different working conditions. All models have undergone rigorous laboratory and on-site tests to ensure stable and reliable performance. The main performance indicators are as follows (all data are based on actual test results):
| Performance Indicator | Specification | Remarks |
| Flow Rate | Up to 4114.9 m³/h | 350QZ-135G model, higher than industry average |
| Head | 1.5m – 22.11m | Depends on model and blade angle |
| Efficiency | Max 84.5% | As per performance curve, 3%-5% higher than older models |
| Operating Temperature | Medium ≤ 50°C | Suitable for most common water transfer scenarios |
| Protection Grade | IP68 | Highest level for submersible equipment, anti-moisture ingress |
In terms of certification standards, the QZ series meets strict industrial and international standards to ensure product quality and safety.
- Motor standard: GB755 (Rotating Electric Machine), which is the national standard that specifies the technical requirements for rotating electric machines.
- Insulation grade: F, which ensures that the motor can withstand high temperatures and run safely for a long time.
- Cooling Method: ICWO8A41, which effectively dissipates heat generated during operation, extending the service life of the motor.
QZ Series Key Component Technology
The excellent performance of the QZ series submersible axial flow pump is mainly attributed to its advanced core component design. Each component has been carefully manufactured to ensure durability, efficiency and zero leakage.
1. Impeller
The impeller is designed with an adjustable blade angle (-6 to +6), which allows users to adjust the blade angle according to actual working conditions and optimize the performance and energy efficiency of the pump. The impeller has a variety of materials to choose from, including cast iron, ductile iron, bronze or stainless steel. These materials can be selected according to the characteristics of the pumping medium (e.g., corrosive water, sediment-laden water).
2. Mechanical Seal
In order to ensure zero leakage, the QZ series has two or three sets of mechanical seals. Silicon carbide vs silicon carbide is used for the first-class seal (contact with water), which has good wear resistance and corrosion resistance. The secondary seals use graphite instead of silicon carbide, which further enhances sealing performance and prevents moisture from entering the motor cavity. This design effectively solves the common problem that the traditional submersible axial pumps damage the motor due to water leakage.
3. Motor
The integrated submersible motor is equipped with built-in leakage sensors and overheating protectors. The leakage sensor can detect water inflow in real time and send out an alarm signal, while the overheat protector will automatically turn off the motor when the temperature exceeds the safe range to avoid the motor burning. The intelligent protection system has greatly improved the reliability and service life of the pump.
Unique Advantages of the QZ Series Submersible Axial Flow Pumps
Compared with other axial flow pumps on the market, the QZ series has three obvious advantages, which make it stand out from competitors (data source: Industry average report in 2023).
1. Cost Efficiency
Compared with the traditional pumping station, the QZ series saves 30% -40% of the civil engineering costs. Because the pump is fully submersible, there is no need to build a complicated ground pump house, which greatly reduces the investment in civil engineering. For example, a municipal pumping station reconstruction project originally required a civil engineering project of 200,000 US dollars. By using the QZ series, the cost can be reduced to 120,000 US dollars, and the one-time investment can save 80,000 US dollars.
2. Easy Maintenance
Unlike standard submersible axial-flow pumps, which lack integrated intelligent protection, the QZ series is equipped with built-in leakage and thermal sensors, which allow remote monitoring of the pump’s operation status. Routine inspections do not require personnel to go down the well, which not only improves maintenance efficiency but also ensures the safety of maintenance personnel. In addition, the modular design of the pump is convenient for disassembly and assembly, reducing maintenance time and costs.
3. Superior Performance
Compared with the old models, the flow velocity of the QZ series has increased by 20% -30%, and the efficiency has increased by 3% -5%. The design of adjustable blade angle enables the pump to adapt to changes in water levels and flow requirements, and ensures stable performance in different working conditions. The highest efficiency of 84.5% also means lower energy consumption, helping users to reduce long-term operating costs.
Application Scenarios of the QZ Series
As a multifunctional submersible axial-flow pump, the QZ series is widely used in many industries. According to our customer data, the top three application industries and their share are as follows.
- Municipal water supply and drainage: 45%. The QZ series is an ideal choice for municipal water intake, drainage and flood control works. Its compact structure and high flow rate make it suitable to be installed in urban underground pumping stations, reducing the occupation of ground space.
- Agricultural Irrigation: 30%. In large-scale agricultural fields, the QZ series can effectively transfer water from rivers, lakes or reservoirs to farmland to meet the irrigation needs of crops. The design of the adjustable blade angle makes it suitable for different irrigation requirements and water levels.
- Industrial water transfer: 25%. The QZ series is used to transport cooling water, process water and other media in industrial production. Its corrosion-resistant materials and reliable sealing performance ensure stable operation in a harsh industrial environment.
Practical Case Study
The renovation project of a municipal pumping station in a medium-sized city is facing major pain points: the original traditional pumping station occupies a large area, the civil engineering cost was high, and maintenance needs to drain the water tank, which takes up to 48 hours, seriously affecting the normal operation of the municipal water supply and drainage system.
In order to solve these problems, our 350QZ-100G submersible axial-flow pump was adopted in this project. The motor and pump body of the pump are coaxial and integrated, eliminating the need to build a complex ground pump house. The installation process was simple and efficient, and the installation period is shortened to 7 days.
After installation, the effect is remarkable: the civil construction cost of the pumping station is reduced by 35%, and there is no need for personnel to go down the well for daily inspection, thus improving maintenance efficiency by 90%. The pump has been running stably for more than two years, without leakage or failure, which effectively guarantees the smooth operation of the municipal water supply and drainage system.
Abnormal Environment Response Solutions
The design of the QZ series has a special function of adapting to the abnormal working environment, ensuring stable work even in harsh conditions.
- High humidity environment: The double mechanical seal design can effectively prevent moisture from entering the motor cavity and ensure the normal operation of the motor in a high humidity environment.
- Sand-laden water: Wear-resistant materials (such as high chromium alloy or 304/316 stainless steel) can be selected for the impeller and pump shell, which can resist abrasion caused by sand and prolong the service life of the pump in a sand-laden water environment.
Customer Benefit Calculation Model (ROI)
Investing in the QZ series submersible axial flow pump can bring remarkable long-term economic benefits to users. The calculation of the return on investment is based on the following assumptions (taking a municipal pumping station as an example).
Suppose a traditional civil engineering project of pumping station costs 200,000 dollars. The use of the QZ series can reduce this cost to $ 120,000, saving $ 80,000 in one-time civil engineering investment. The service life of the QZ series is 10 years, so the civil engineering costs are saved by 8,000 US dollars every year. In addition, compared with the traditional pump, the high efficiency (up to 84.5%) of the pump can reduce the energy consumption by 3% -5%, thus further reducing operating costs. With these savings, users can realize a return on investment in the first year of operation.
Frequently Asked Questions (FAQ)
In order to help users better understand and use the QZ series submersible axial flow pumps, we have compiled the following common technical questions and standard answers.
Q 1: What is the minimum submergence depth for the QZ pump?
A 1: The minimum immersion depth must be greater than that shown in the outline drawing to prevent vortex formation and cavitation. The formation of a vortex can lead to air entering the pump, which will reduce the performance of the pump and damage the impeller, while cavitation can wear the parts of the pump and shorten the service life.
Q2: Can the blade angle be adjusted on site?
A 2: Yes, the QZ series features an adjustable impeller. This angle can be modified by professionals to optimize the performance of water level changes. It should be noted that in order to ensure safety, the adjustment must be made with the pump turned off and the power supply disconnected.
Q 3: What materials are available for the impeller of the QZ pump?
A 3: The impellers are available in cast iron, ductile iron, bronze or stainless steel. Users can choose the appropriate material according to the characteristics of the pumping medium. For example, stainless steel 304/316 is suitable for corrosive water, while high chromium alloy is suitable for sand-bearing water.
Q 4: How to maintain the QZ series submersible axial flow pump?
A 4: Daily maintenance includes checking the running state of the pump (such as current, voltage and temperature) through the remote monitoring system, cleaning the pump inlet to prevent blockage and checking whether the mechanical seal leaks. Regular maintenance (every 6 months) includes disassembling the pump, checking the wear of the impeller and mechanical seal, and replacing worn parts if necessary.
Why did you Choose the Kairun pump group as Your Axial Flow Pump Manufacturer?
As a professional axial flow pump manufacturer, Kairun has rich experience in research, development, production and sales of submersible axial-flow pumps. Our QZ series products are produced in strict accordance with international standards, with complete authentication and reliable quality. We provide comprehensive after-sales services, including installation instructions, maintenance training and technical support, to ensure that users can use our products with confidence.
Whether you are looking for a submersible axial-flow pump for municipal water supply and drainage, agricultural irrigation or industrial water delivery, the QZ series is a reliable choice to meet your needs for efficiency, stability and cost-effectiveness. Please contact us now to learn more about the QZ series and customize the solution for your project.
