Changsha Zhonglian Pump Industry Co., Ltd.

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Having 26 series -312 varieties - over 1000 pump models

Focused on water pump research and development manufacturing for 36 years

Free training for operation and maintenance personnel/free installation guidance/free provision of installation drawings

Self-balancing multistage pump

Multistage pump

Coal Mine Safety Certified Multi-stage Pump

Vertical multistage pump

Integrated pump station

Vacuum pump

Fire pump

Constant-pressure water supply equipment

Other pumps

Genuine accessories

QH-type submersible mixed-flow pump

Traffic: 400–1600 m³/h

Head: 2-20m

Power: 7.5-330kw

Rotational speed: 1450r/min

Price: 1.13–295,000

The QH series submersible mixed-flow pump is a submersible motor designed for applications involving high flow rates and relatively low head. The typical head range for these submersible mixed-flow pumps is within 20 meters. They represent an upgraded, next-generation alternative to conventional mixed-flow pumps. The motor and pump are integrated into a single unit that operates submerged in water, offering a host of advantages unmatched by traditional pump units.

Hotline:

+86 0731-88632200

classification：

Mixed-flow pump

keyword：

Horizontal Single-Stage Fire Pump

Product consultation

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Product overview Product parameters Why choose us? Frequently Asked Questions

Product Overview

The QH series submersible mixed-flow pumps are submersible motors designed for applications involving high flow rates and relatively low head requirements. The typical head range for these submersible mixed-flow pumps is within 20 meters. This product represents an ideal replacement for conventional mixed-flow pumps. With the motor and pump integrated into a single unit, it can be fully submerged in water for operation, offering a host of advantages that traditional pump sets simply cannot match. Submersible axial-flow pump stations have rapidly gained popularity due to their simple civil engineering requirements, low construction costs, convenient maintenance and management, easy operation and straightforward automation capabilities, excellent operational reliability, and aesthetic appeal.

The QH mixed-flow pump is suitable for conveying clear water or lightly polluted wastewater. In agriculture, it is used for irrigation and drainage; in municipal applications, it handles stormwater and lightly polluted wastewater; in industrial settings, it serves as a source of process water, cooling water, and raw water supply; and in hydraulic engineering, it is employed in water diversion projects.

QH Series Submersible Mixed-Flow Pump

There is no need for labor-intensive, time-consuming, or complicated shaft alignment and assembly procedures on-site, making installation extremely convenient and quick. As a result, there is no requirement to reserve space for a standby pump; the standby pump can simply be stored in the warehouse, thereby reducing investment costs for the pump station’s intake basin. Since the pump operates submerged in water, the design of the pump station and its structural engineering can be greatly simplified, reducing the installation footprint and cutting the overall pump station construction costs by 30% to 40%. When the pump operates underwater, the water flow passes around the motor, resulting in low noise levels and excellent cooling conditions for the motor. The pump station can even be constructed underground, preserving the aesthetic appearance of the surrounding ground surface. The use of submersible pumps represents an ideal solution for constructing pump stations and addressing flood control challenges in areas along rivers and lakes where water levels fluctuate significantly. By eliminating the long shaft connecting the motor and pump, this approach enhances operational safety and reliability.

Product Parameters

Main features of the QH-type high-flow submersible mixed-flow pump

1. The motor and pump are integrated into a single unit, eliminating the need for time-consuming, labor-intensive, and complex shaft alignment procedures on-site. This makes installation extremely convenient and quick, allowing operators to forego reserving space for a standby pump and instead store the backup pump in a warehouse, thereby reducing investment costs for the pump station’s intake basin. Moreover, since the pump operates submerged in water, the civil engineering and structural design of the pump station can be significantly simplified, reducing the required installation area and enabling construction cost savings of 30% to 40%.

2. The pump operates underwater, with water flowing around the motor, resulting in low noise and excellent cooling conditions for the motor. It can be constructed as an underground pump station, helping to preserve the aesthetic appearance of the ground surface.

3. The use of submersible pumps is an ideal solution for constructing pump stations and addressing flood control issues in riverside and lakeside areas with significant water level fluctuations, eliminating the need for long shafts between the pump and motor and thereby enhancing operational safety and reliability.

Model Description for QH High-Flow Submersible Mixed-Flow Pump

Model Description for QH Submersible Mixed-Flow Pump

Design Instructions for QH-Type High-Flow Submersible Mixed-Flow Pump

1. Impeller
The impeller adopts a state-of-the-art hydraulic model, featuring excellent performance, stability, and maturity. It boasts superior cavitation resistance, ensuring smooth operation.

2. Shaft Seal
Two sets of independent mechanical seals isolate the motor from the pump’s seal; installed in series, top and bottom, they provide multiple layers of protection, enhancing reliability.

3. Oil chamber
Oil lubricates and cools the mechanical seal, providing an isolation barrier between the motor and the medium being conveyed. The retained internal volume helps to slow down the rise in pressure within the oil chamber.

4. Anti-rotation device

At the moment of unit startup, the reaction torque generated by the motor's starting torque often causes the entire unit to rotate in the opposite direction. A anti-rotation device can solve this problem.

5. Bearing
The bearing uses rolling bearings that can withstand both axial and radial loads and are completely isolated from the medium conveyed by the pump.

6. Pump/Motor Shaft
The pump and motor are coaxial, featuring a compact structure with the shaft extension minimized as much as possible. This design reduces deflection, resulting in low vibration during operation and extending the service life of both the seals and bearings.

7. Motor

High-performance squirrel-cage induction motor specially designed and manufactured for submersible pumps, compliant with GB 755 standard. Insulation class F, with a maximum operating temperature of up to 135℃. Depending on the power rating, it can operate at voltage levels such as 380V, 660V, 3kV, 6kV, and 10kV. For high-voltage motors, a two-stage VP insulation process is employed to ensure reliable insulation performance.

8. Cooling
The motor housing directly transfers heat to the surrounding medium, where it is carried away by the circulating water. For high-power, high-voltage motors, an internal air duct cooling technology is employed, which results in lower temperature rise of the three-phase windings and a more uniform temperature distribution.

9. Monitoring device
The submersible pump is equipped with multiple protective devices, and the lead wires can be routed to the electrical control box. The protective devices include: overload protection, phase-loss protection, leakage protection, overtemperature protection, humidity protection, and water immersion protection.

Friendly reminder: For more performance parameters of the QH-type submersible mixed-flow pump, please click → [Water Pump Selection] Page query

Why choose us?

Changsha Zhonghlian Pump Industry Co., Ltd. was founded in 1989 and was independently established after the restructuring of Changsha Water Pump Factory. It is a comprehensive national high-tech enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Equity Exchange on December 31, 2019, with the abbreviation "Zhonghlian Pump Industry" and the equity code: 600275HN. It is currently a key backbone enterprise in China's centrifugal pump industry and one of the major professional manufacturers of multi-stage pumps in the country. The headquarters is located in Changsha City, Hunan Province, a historical and cultural city in China.

41000 m²

Square meters of land area

100 %

100% factory pass rate

41000 m²

Square meters of land area

100 %

100% factory pass rate

What is your typical delivery time?

Models in stock can be shipped the next day at the latest. All others are custom-made, with lead times generally ranging from 7 to 90 days depending on the product size and project specifics. Please contact our sales manager for details: 0731-88632200 。

Do you have centrifugal pumps in stock?

Centrifugal pumps come in numerous models and configurations. Except for a small number of high-volume, standard models that are in stock, the vast majority are not stocked and are customized products. We need to select a pump based on your site's flow rate, head, media temperature, pH value, and installation conditions, etc., to determine the pump model and configuration before we can submit an order to the factory for production.

What information should I provide when requesting a quote?

Generally, to obtain an accurate quotation, we recommend providing us with the following information: pump flow rate, head, on-site operating voltage and frequency, temperature, pH value, and solid particle content of the fluid being conveyed, and on-site installation conditions (horizontal or vertical installation), etc.

If you are not sure, don't worry, our business managers will assist you in determining this.

What products do you mainly produce?

Zhonglian Pump Industry manufactures various large industrial centrifugal pumps. Main products include: self-balancing multi-stage pumps, multi-stage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condensate pumps, etc.

Could you help me with the selection?

Certainly! If the water pump model is not selected accurately, there will be big problems. If you choose a smaller one, it won't meet your needs; if you choose a larger one, it will waste electricity and fuel, increasing your costs.

Why is it so slow to get a price quote?

Because centrifugal pumps are non-standard customized products with many models, the price range is also very large. Even for the same model, the price difference is also very large due to different materials and configurations. Taking the most common water pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clarify the relevant information to give you an accurate price. Normally, if you provide relatively comprehensive information, we can quote within 5 minutes.

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+86 0731-88632200

Export Trade/Technical Support:

+86 153-4831-2290

Head Office Email:

zoomlian@yeah.net

No. 210, Huanbao Zhong Road, Yuhua District, Changsha City, Hunan Province, Leowoju Wisdom Valley Building B, 8th Floor

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Self-balancing multistage pump

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Constant-pressure water supply equipment

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