QXB Submersible Centrifugal Aerator – Self-Priming Aeration Mixer

Product Description

Model Code Explanation

Product Overview

QXB submersible centrifugal aerator adopts a direct-coupled structure. The QXB series is a self-priming aerator. The rotating impeller generates centrifugal force and creates a negative pressure at the impeller inlet, drawing in both air and water. Using the kinetic energy of the impeller, air and water are mixed in a mixing chamber at a certain ratio. Under centrifugal force, the two-phase air–water flow is straightened through the flow passage and rapidly diffuses in the tangential direction of the impeller toward the surroundings. The resulting high-speed shearing generates fine micro-bubbles which fully blend with the water, thus achieving aeration and oxygenation.

This series is suitable for applications where solid–liquid agitation and mixing are required.

Product Applications
QXB submersible centrifugal aerators are used for aeration, oxygenation and mixing in aeration tanks, aerated grit chambers, pre-aeration tanks, and aerobic nitrification tanks of various wastewater treatment processes, as well as for oxygenation in aquaculture ponds.

Working Principle
The QXB submersible centrifugal aerator is a self-priming, direct-coupled aeration device. The rotating impeller produces centrifugal force and creates a negative pressure at the impeller inlet, drawing in air and water. The impeller energy is used to mix air and water in the mixing chamber at a certain ratio. Under strong centrifugal force, the two-phase air–water flow is straightened through the flow passage and diffuses radially. The finely dispersed micro-bubbles fully blend with the water, thus achieving efficient oxygenation and aeration.

Structural Features

1. Self-positioning by its own weight, easy installation, and flexible layout without interrupting process operation.
2. Compact design with built-in self-priming function, no external air source required.
3. Submersible operation of the main unit reduces footprint and noise.
4. Can be used directly in oxidation ponds, reducing civil construction costs.
5. Independent mobile aeration unit, providing both aeration and mixing functions during operation.
6. The base can be specially designed according to user requirements.

Performance Parameters

Model	Power (kW)	Rated Current (A)	Impeller Speed (r/min)	Effective Range Φ (m)	Submergence Depth (m)	Air Inlet Pipe Diameter (mm)	Air Intake (m³/h)	Weight (kg)
QXB0.75-32	0.75	2	1390	2.8	1–2	32	15–10	62
QXB1.5-32	1.5	3.7	1400	3.5	1–3	32	25–18	105
QXB2.2-50	2.2	5.2	1430	4.8	1–3.5	50	44–25	182
QXB3-50	3	6.8	1430	5.5	2–4	50	50–40	198
QXB4-50	4	8.8	1440	6.5	2–4	50	75–45	234
QXB5.5-65	5.5	11.8	1440	8.0	2–4.5	65	120–70	298
QXB7.5-80	7.5	15.6	1440	10	2–4.6	80	160–75	318
QXB11-80	11	22.3	1460	11	2–4.8	80	260–120	382
QXB15-100	15	30.1	1460	12	2–5	100	325–220	413
QXB18.5-100	18.5	36.5	1470	12.5	2–5	100	375–260	476
QXB22-100	22	43.2	1470	13.5	2–5.5	100	470–260	495
QXB30-150	30	56.8	1470	16	2–6	150	510–300	1200
QXB37-150	37	69.8	1480	16	2–6	150	570–390	1296
QXB45-150	45	84.2	1480	16	2–6	150	630–460	1380
QXB55-150	55	103	1480	16	2–6	150	825–620	1430

Operating Instructions

Before starting the submersible aerator, the system must be inspected by a qualified electrician to ensure that all required electrical protection measures have been implemented.

1. Before operation, use a 0–500 V megohmmeter to check the insulation resistance between the motor stator windings and ground; the value must not be lower than 1 MΩ.
2. The supply voltage must be within ±5% of the rated voltage shown on the nameplate. The voltage rise must not exceed 10% of the rated value. If the power supply is far away from the installation site, the cable cross-section should be increased and cable joints minimized, otherwise excessive voltage drop may occur. All joints must be properly sealed and waterproof.
3. In the four-core cable, the core with the grounding mark (usually yellow-green) is the earth conductor. For safety, the earth wire must be firmly connected and made 50 mm longer than the other cores.
4. Check the direction of impeller rotation. For three-phase submersible aerators, the rotation direction must be checked on first start-up or after each reinstallation. Incorrect direction will reduce efficiency and may damage the pump. To check, lift the unit before installation and perform a brief start. Looking upward from the suction inlet at the bottom, the impeller should rotate counterclockwise. If several aerators are connected to one controller, each unit must be checked individually. If the rotation is incorrect, swap any two phases of the three-phase supply at the controller to reverse the rotation.