1. Product introduction

1. Product Overview

    HWQB -□-□ series explosion-proof submersible electric pump (hereinafter referred to as submersible pump) adopts all stainless steel/cast iron design and consists of three parts: submersible pump, seal and motor. The motor is located at the upper part of the submersible pump, which is a single-phase or three-phase asynchronous motor structure. The liquid pump is located at the lower part of the motor. It adopts a unique single- and double-channel multi-stage impeller structure, which greatly improves the liquid passing capacity. The appearance adopts precision casting and stainless steel barrel, which is beautiful and elegant, and has the characteristics of rust resistance, corrosion resistance and pollution-free.

2. Applicable occasions

(1) Discharge of seriously polluted waste liquid from factories and businesses

(2) Used in flammable and explosive products such as petrol station chemical plants

(3) Drainage system of urban sewage treatment plant.

(4) Drainage station of civil air defense system.

(5) Discharge of sewage from hospitals and hotels.

(6) Municipal engineering and construction sites.

(7) Exploration and mining auxiliary machines.

(8) Farmland irrigation of rural biogas digesters.

3. Conditions of use

    The temperature does not exceed 40℃, the volume ratio of solid impurities in the material does not exceed 0.1%, and the particle size does not exceed 0.2mm. If the liquid exceeds 40℃s, please choose high temperature mechanical seal. Cable material can choose stainless steel 304 316

(2) The electric pump can be submerged under the liquid as a whole, and can be used vertically and horizontally. However, the liquid should not be lower than the impeller of the electric pump, so as to avoid insufficient liquid output from the electric pump and insufficient cooling of the motor, which may cause the machine to burn.

(3) When conveying dirt, it is necessary to install a filter screen on the bottom plate of the impeller of the electric pump to avoid blockage inside the impeller, and the debris should be cleaned up in time when not in use.

4. Explosion proof mark: Ex d IIC T4 Gb

5. Implement the standard

    GB 3836.1—2010 Explosive Atmospheres Part 1: Equipment General Requirements

    GB 3836.2—2010 Explosive Atmospheres Part 2: Equipment Protected by Flameproof Enclosure "d"

    GB 25286.1-2010 Non-Electrical Equipment for Explosive Atmospheres Part 1: Basic Methods and Requirements

    GB 25286.3-2010 Non-Electrical Equipment for Explosive Atmospheres Part 3: Flameproof Enclosure Type "d"

    GB/T 4208-2017 Enclosure Protection Level (IP Code)

6. Applicable working environment

7. Ambient temperature -20℃～+1000℃;

8. Relative humidity≤95%(+25℃);

Explosive gas mixture hazardous locations Zone 1, Zone 2;

Explosive gas mixture temperature group T1~T4;

Explosive gas mixture hazard classes IIA, II B

Protection class: IP68

2. Product model

3. Main technical parameters

The product uses certified explosion-proof motors, and the explosion-proof structure of the pump body is the same. The approximate parameters are as follows:

4. Structure overview

     1. The external structure is as shown in the figure

2. The submersible pump consists of two parts, the motor and the pump body. The two are separated by the oil isolation chamber and the mechanical seal assembly. They are mechatronic products. The motor and the pump share the same shaft (rotor). The entire submersible pump has a short length and a structure. compact. Equipped with a variety of protection devices, the pump runs safely and reliably.

Its main components are as follows:

Motor stator: Use Class B or Class F insulation.

Mechanical seal: It adopts double-channel series seal, and adopts new hard and corrosion-resistant tungsten carbide material, which has the characteristics of reliable sealing, wear resistance and long service life.

Rotor: The rotor adopts a single-flow channel or double-flow channel structure, which has a strong passing capacity and can pass through large materials and fiber waste, reducing blockage and winding failures.

Pump body: It is used with the rotor to make the pump have high efficiency.

5. Usage and precautions

    1. Before using the submersible pump, carefully check whether the cable is damaged, whether the fasteners are loose or falling off, and whether the submersible pump is deformed or damaged during transportation, storage, and installation.

    2. Use a 500V megohmmeter to measure the insulation resistance between the same and relative ground of the submersible pump motor, and its value should not be lower than 2 megohms, otherwise the stator winding of the motor should be dried, and the drying temperature should not exceed 120℃.

    3. The installation of this series of submersible pumps has two types: fixed type and mobile type. When the fixed automatic installation is adopted, the submersible pump should be lifted up and down through the two lifting ring screws or the lifting plate respectively (deviate from the pump liquid outlet, and its connection line should be parallel to the pump liquid outlet). Slide down the rail evenly and slowly until the automatic coupling is in place. When using mobile installation, first cover the hose, and use the chain cable to pass through the two rings to lift the submersible pump up and down. Be careful not to use the cable as a rope to avoid danger.

    4. The rotation direction of the submersible pump after it is turned on is seen from the liquid inlet as counterclockwise rotation. If the submersible pump is reversed, just switch any two wires in the cable to the wiring position.

    5. The chassis ground wire of the submersible pump must be connected in strict accordance with the relevant regulations. In order to ensure personal safety during use, when the submersible pump is running, it is strictly forbidden to install it nearby, do things or move it in the liquid, just in case the submersible pump is submerged. An accident occurred due to the leakage of the liquid pump.

    6. The submersible pump must be equipped with a fully automatic liquid pump control cabinet unless there are special circumstances. Do not directly connect to the power grid or use a knife switch to connect the power supply to ensure the normal operation of the submersible pump.

    7. Do not run the submersible pump in a low head state for a long time (generally the head should not be lower than 60% of the rated head), it is best to control it within the recommended head range to prevent the submersible pump from burning out the motor due to overload .

    8. The submersible pump without self-circulating cooling device is strictly prohibited to operate with the whole exposed to the liquid surface for a long time to prevent the submersible pump from being damaged by overheating.

6.maintenance and maintenance

     1. The submersible pump should be managed and used by a special person, and regularly check whether the insulation resistance between the submersible pump winding and the casing is normal.

     2. After each use, especially for thicker and more viscous slurry, the submersible pump should be put into clean water and run for several minutes to prevent deposits from leaving the submersible pump and ensure the cleanliness of the submersible pump.

     3. If the submersible pump is not used for a long time, the submersible pump should be taken out of the liquid, and should not be immersed in the liquid for a long time, so as to reduce the chance of the motor stator winding being damp and increase the service life of the submersible pump.

     4. Under normal conditions, the pump should be filled with or replaced with oil (No. 10~30 oil) in the oil chamber after every 300~500 hours of use to keep the mechanical seal in a good lubricating state and improve the service life of the mechanical seal.

     5. After the submersible pump is disassembled and repaired, the casing components must be checked by the 0.2MPa air tightness test to ensure the reliable sealing of the motor.

7. Operation of explosion-proof submersible pump motor

     1. During the operation of the motor, the surface should be kept clean, and the air inlet should not be obstructed by dust fibers.

     2. The voltage of the motor is not allowed to exceed 10% of the rated voltage.

     3. There should be no intermittent or abnormal sound or vibration when the motor is running without load or under load.

     4. When the thermal protection device and short-circuit protection device of the motor operate continuously, check the cause of the fault (whether it is from the motor or from overload or because the setting value of the protection device is too low), and put it into operation after the fault is eliminated.

     5. During operation, use a thermometer to measure the temperature rise of the casing, generally not exceeding 190°C.

     6. The motor bearing should be well lubricated during the operation. Generally, the motor should run for about 2000h, that is, the grease should be supplemented or replaced (the closed bearing does not need to be replaced during the service life).

8. Inspection and maintenance of explosion-proof submersible electric pump

     The inspection and maintenance of explosion-proof submersible pumps shall comply with the provisions of the standard GBT3836.16-2017 "Explosive Atmospheres, Part 16: "Inspection and Maintenance of Electrical Installations".

9. Maintenance of explosion-proof submersible electric pump

     The maintenance of explosion-proof submersible pumps shall comply with the provisions of GB 3836.13-2013 "Explosive Atmospheres - Part 13: Repair, Overhaul, Repair and Alteration of Equipment".

10. Storage and transportation of explosion-proof submersible electric pump

     1. The storage of the submersible pump should be kept dry to avoid sudden changes in ambient temperature.

     2. The storage of explosion-proof submersible pumps should not be stacked too high, so as not to affect ventilation and damage the packaging of the lower explosion-proof submersible pumps.

     3. The explosion-proof submersible pump should be prevented from overturning during storage and transportation.