Structure and Working Principle of Du'an Environmental Protection QJB-W Submersible Reflux Pump:

The submersible reflux pump consists of an impeller, submersible motor, flow guide cover, wall-penetrating pipe, flap gate, installation lifting guide rod, lifting steel cable, underwater cable, lifting frame and hand-operated lifting device, angle steering device, local control cabinet, etc.

The submersible reflux pump rotates smoothly and freely without jamming, stalling, or vibration;

The submersible reflux pump undergoes a sealing pressure test with a test pressure of 0.3 MPa for 5 minutes without any leakage;

The submersible reflux pump adopts a dual mechanical seal structure and a lip seal to form a dynamic sealing system, ensuring reliable operation for 25,000 hours without replacement;

The submersible reflux pump can operate continuously both fully submerged and with the submersible motor exposed above the liquid surface, and it can resume normal operation immediately after startup even after intermittent or long-term shutdown.

The cable of the submersible reflux pump uses YZW-type rubber-sheathed flexible cable as per GB5013.2 or other cables with equivalent performance, with a standard length of 10 meters per unit. The cable sealing head is specially treated to prevent damage to the cable sheath and water seepage into the motor;

The surface of the submersible reflux pump is bright and free from contamination, damage, cracks, etc.;

The oil chamber of the submersible reflux pump has sufficient space to accommodate expansion caused by temperature differences and is equipped with a seal leakage protection device;

The two-color wire (yellow/green) in the cable of the submersible reflux pump is designated as the grounding wire, ensuring reliable connection. The grounding mark is clear and不易磨滅 during use;

The impeller and rotor of the submersible reflux pump undergo dynamic balance testing with a balance accuracy of G6.3;

The stator winding and upper and lower bearing positions of the submersible reflux pump are equipped with thermal protection switches, and the stator cavity is equipped with a seal leakage protection device.

The installation guide rod of the submersible reflux pump ensures free rotation, lifting, and adjustment of various angles, allowing the mixer to be lifted and installed without draining the tank.

Service Life of the Submersible Reflux Pump:

Under specified conditions, the mean time before the first failure of the submersible reflux pump is not less than 10,000 hours, and the overall service life is not less than 20 years.

Technical Specifications of the QJB-W Sludge Reflux Pump:  

The QJB-W sludge reflux pump is a new product developed based on submersible mixer production technology. It is a specialized equipment for mixed liquid reflux and denitrification in secondary sewage treatment plants. It can also be used for pumping purified water during surface drainage, irrigation, and control of water channel systems, as well as in recirculation during wastewater treatment or in sludge suction circuits requiring low head and high flow.

The QJB-W sludge reflux pump is equipped with a technically advanced axially operating three-blade impeller, which has excellent self-cleaning and vibration-free functions. The impeller design meets the requirements of high flow and low head, generating high flow axially. It adopts Flygt submersible motor sealing technology from Sweden to ensure safe and reliable sealing. When water enters the oil chamber, the humidity sensor in the probe leakage detection system will automatically send an alarm signal for timely detection and prevention of secondary failures. The motor winding of the QJB-W submersible reflux pump uses the internationally advanced safest overheating protection process. In case of overheating due to motor overload, high medium temperature, or other reasons, the temperature sensor will send an alarm signal or automatically shut down the pump before the temperature exceeds the allowable limit.

The QJB-W sludge reflux pump is equipped with a single-guide rail automatic coupling system, ensuring quick installation, lifting, and maintenance. Developed based on the digestion and absorption of foreign同類產品 technology, it features high efficiency, anti-clogging, non-clogging, automatic coupling, high reliability, and automatic control. It has unique functions in discharging solid particles and long-fiber debris. The QJB-W submersible reflux pump is a self-developed product based on introduced German submersible motor production technology. It is a specialized equipment for mixed liquid reflux and denitrification in secondary sewage treatment plants and can also be used in applications requiring low head and high flow, such as surface drainage, irrigation, and recirculation during wastewater treatment.

The QJB-W sludge reflux pump offers low head, high flow, and high efficiency. The impeller features a high-performance hydraulic design structure, with backward-swept blades that have self-cleaning functions, anti-clogging, and anti-wrapping. It uses new sealing materials, dual mechanical seals made of tungsten carbide–tungsten carbide, imported bearings, and all fasteners are stainless steel, ensuring safe and continuous operation for over 10,000 hours. The QJB-W submersible reflux pump has a compact structure, simple operation and maintenance, easy installation and repair, and a long service life. The main unit adopts cast or stainless steel pressure-filled成型 structure, with small size, high density, corrosion resistance, and no noise. It is equipped with protection and alarm devices for leakage, water ingress, and motor overload, ensuring product safety and reliability.

Supply Scope of Jiangsu Du'an Environmental Protection Sludge Reflux Pump:

The Jiangsu Du'an Environmental Protection internal reflux wall-penetrating pump should be a complete set of equipment and must be equipped with a local control box, stainless steel dual guide rods, stainless steel lifting chains, cantilever, lifting hoist, wall-penetrating pipe, flap gate, cable from the control box to the equipment, and other necessary accessories for safe operation.

Supply Scope (including but not limited to the following):

(1)  Fully assembled internal reflux pump

(2)  Monitoring unit

(3)  Complete lifting device

(4)  At least 10m of underwater cable per pump

(5)  All connecting accessories, embedded parts, anchor bolts, etc.;

After-Sales Service of Du'an Environmental Protection Equipment (Jiangsu) Co., Ltd.:

After-sales service is crucial for the company's business development and reputation, and it is an important step for the company's progress.

For users, it is a guarantee of product quality and peace of mind;

1. Adhere to the principle of customer first. All products produced by our company meet strict enterprise standards and national mechanical department standards.

2. Provide spare parts, installation, debugging, maintenance services, and technical training for relevant personnel of customers in a timely manner according to customer needs or agreements.

3. For large-scale projects, organize production, testing, and inspection according to the requirements of the bidding documents and cooperate with on-site acceptance by customers.

4. Strictly follow IS09001 standards for the procurement of raw materials and components, as well as for product production and inspection.

5. Provide three-guarantee (warranty, return, exchange) services if the product cannot function normally due to manufacturing quality issues under normal storage, transportation, maintenance, and usage conditions by the customer.

6. Provide necessary technical documents and product qualification certificates for出廠 products.

7. During the warranty period, if the equipment fails to meet the specified technical parameters due to errors in the equipment or technical資料 provided by us when the user operates according to the relevant technical documentation, the user shall immediately notify us. We will replace/repair the defective equipment or technical資料 within 24 hours after receiving written or telephone notice.

8. If damage or malfunction occurs due to improper use by the user or outside the warranty period, our company provides終身維修 services for the product.

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