Installation diagram of submersible reflux pump

Submersible reflux pump

1Equipment Name:Submersible reflux pump

2Equipment model:QJB-W2.5

3Main technical parameters

4. Purpose:

This pump is a specialized equipment for mixed liquid reflux and denitrification denitrification in two-stage sewage treatment plants. It can also be used in places where micro lift and high flow are required for surface drainage, irrigation, and wastewater treatment processes such as recycling.

5Characteristics

Compact structure, easy installation, simple operation, easy maintenance, no noise, can be installed freely.

6Scope of application

The submersible reflux pump can operate normally and continuously under the following conditions

6.1 Altitude not exceeding 1000m;

6.2 The maximum medium temperature shall not exceed 40^OC；

6.3 The pH value of the medium is between 5-9;

6.4 Liquid density not exceeding 1150kg/m³；

6.5 Long term diving operation, with a diving depth generally not exceeding 20m;

7Construction and working principle

7.1 The submersible reflux pump consists of an impeller, submersible motor, guide cover, through wall pipe, flap door, installation and lifting guide rod, lifting steel rope, underwater cable, lifting bracket and hand-operated lifting device, angle steering device, local control cabinet, etc.

7.2 The submersible reflux pump rotates and balances freely without any jamming, stagnation, vibration or other phenomena;

7.3 Conduct a sealing pressure experiment on the submersible reflux pump, with an experimental pressure of0.3MPaOver time5No leakage in minutes;

7.4 The submersible reflux pump adopts a dual mechanical seal structure and a lip seal to form a dynamic sealing system. The mechanical seal ensures that25000Reliable operation within hours without the need for replacement;

7.5 The submersible reflux pump can work continuously under the conditions of full immersion and the submersible motor exposed to the liquid surface, while ensuring that it can still operate normally once turned on, even in the case of intermittent operation and long-term shutdown.

7.6 The cable leading out of the submersible reflux pump adoptsGB5013.2ChineseYZWType rubber sheathed flexible cable or other cables with the same performance, standard configuration length per unit10m， The cable sealing head is treated with special vulcanization to prevent damage to the cable sheath and water leakage to the motor;

7.7 The surface of the submersible reflux pump is bright and free of stains, bumps, cracks, and other phenomena;

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

7.9 Double colored wire (yellow) in the cable leading out of the submersible reflux pump/Green is designated as the grounding wire, and the connection is reliable. The grounding sign is obvious and not easily erased during the service life;

7.10 The impeller and rotor of the submersible reflux pump are subjected to dynamic balance testing, with a balance accuracy ofG6.3；

7.11 There are thermal protection switches installed in the stator winding and upper and lower bearing positions of the submersible reflux pump, and a sealed leakage protection device is installed in the stator chamber.

7.12 The installation guide rod of the submersible reflux pump can ensure the free rotation, lifting, and adjustment of various angles of the equipment, and there is no need to empty the tank when lifting and installing the mixer.

8Service life

The average operating time of the submersible reflux pump before the first failure under specified conditions shall not be less than10000Hour,

The service life of the whole machine shall not be less than20Year.

9Structural Design

9.1 impeller

Adopting a swept back anti twist curve design, made of stainless steel material, and carefully processed through dynamic balancing experiments, it can efficiently transmit motor output power. In order to prevent blockage and slagging of the impeller, and to prevent loosening between the impeller and the shaft during operation, an internal locking device is used on the impeller fixing structure.

9.2 motor

The motor and impeller of the submersible reflux pump are directly connected, and the insulation level of its winding isFLevel, maximum operating temperature

The degree can reach155^OCThe motor will not experience overload under maximum load and can only be started at most per hour15Secondly, but the time interval should be uniform. The stator of the motor is embedded in the casing using the hot sleeve method, without the need for any positioning pins, and is firm and reliable. Under normal circumstances, the temperature rise of the motor does not exceed80^OC.

9.3 bearing

The motor rotor is supported by a double row angular contact ball bearing and a cylindrical roller bearing;

The operating life of the submersible reflux pump bearings is greater than100000Hour;

9.4 Shaft seal

The submersible reflux pump consists of two mechanical seals and one lip seal. A spiral is installed inside the outer sealed cavity

Groove to remove impurities and reduce seal wear. Sealing device material: tungsten carbide/Tungsten carbide.

9.5 monitoring system

There are three normally closed thermal switches connected in series in the stator winding, and the thermal switches are140^OCaction

There are leakage detectors installed in the stator chamber and oil chamber of the motor to detect the leakage of dynamic and static seals, and to cut off the power supply in a timely manner.

10Main materials

host case stainless steel304

axis stainless steel420

impeller stainless steel304

fairing stainless steel304

Wall penetrators and door flaps 　　　 stainless steel304

Guide rod, steel wire rope, lifting ring stainless steel304

Lifting device, steering device stainless steel 304

Fasteners such as nuts and bolts stainless steel316

mechanical seal tungsten carbide/tungsten carbide

Stainless steel control cabinet304

11On site button box

Each pump can be equipped with a local button box according to user requirements, with a protection levelIP65Can meet the requirements for long-term outdoor use.

It can realize the on/off and self-protection of each device, and users only need to provide an external power supply.

Local button box with automatic function/Manual switch, when switched to automatic mode, the submersible reflux pump can accept signals from the central control roomPLCThe command to start and stop sent; When switching to manual mode, it is possible to manually control the start and stop locally.

The button box can achieve self-protection of the equipment, with super temperature and leakage protection functions, and can send signals to the central control room to alarm and stop the machine.

When any type of super temperature or leakage occurs in each submersible reflux pump, it can be directed to the central control roomPLCSend out a total fault signal, and the category of the fault signal can be reflected on the local control box in the form of an alarm indicator light.

The button box can be connected to the central control roomPLCSend the on/off status signal of the device.

12Scope of supporting facilities

2 fully assembled submersible reflux pump main unit;

2. Supporting rails, brackets, lifting devices, wall pipes, doors, steel wire ropes, connecting accessories, bolts and other fasteners;

2. Electric control box;

after-sales service

The after-sales service of Nanjing Du'an Water Treatment is crucial for the company's business development and the establishment of its reputation, and it is also an important step for the company's development and progress. For users, it is a guarantee of product quality and also a reassuring guarantee;

1Adhering to the principle of customer first, all products produced by our company meet strict enterprise standards and national machinery department standards

2Provide spare parts, installation, commissioning, and maintenance services in a timely manner according to customer needs or agreements, and provide technical training to customer personnel.

3For large-scale engineering projects, production, testing, and inspection will be organized according to the requirements of the bidding documents, and cooperation will be provided with on-site acceptance by customers.

4Strictly followIS09001Standard organization for the procurement of raw materials and components, as well as the production and inspection of products.

5When the product cannot be used normally due to manufacturing quality issues under normal storage, maintenance, and usage conditions of the customer, we provide three guarantees (warranty, return, and replacement) service.

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

7.During the warranty period, if the equipment fails to meet the specified technical parameters due to errors in the equipment or technical information provided by me, the user should immediately notify us when performing reasonable operations based on relevant technical information. After receiving written or telephone notification,24Exchange within hours/Repair defective equipment or technical documentation.

8.If the product is damaged or malfunctions due to improper use by the user or outside the warranty period, our company provides lifelong repair services for the product