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QJB Submersible Mixer Wastewater Sludge Mixing and Flow Propeller

Optimize your wastewater treatment efficiency with the QJB Submersible Mixer from Nanjing Wangyang Pumps. Available in High-Speed Mixing and Low-Speed Propeller series, this IP68-rated equipment delivers superior sludge homogenization and powerful flow generation while effectively preventing sedimentation.

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Description

Specification

Applications

Features＆Advantages

Selection Precautions

Introduction of QJB Submersible Mixer‌

‌The QJB Series is a versatile submersible solution engineered for diverse industrial needs. Depending on the process, it offers two configurations: the direct-drive "Mixed-Type" for turbulence and the gear-reduced "Low-Speed Propeller" for circulation. Available in Cast Iron (Casted) or Stainless Steel (Stamped) body options to suit various corrosive environments.

High-Speed Mixing Series‌

Ideal for wastewater treatment plant balancing tanks, nitrification/denitrification tanks, sludge treatment/storage tanks, and industrial processes involving liquid mixing with suspended solids. Effectively prevents sedimentation.

‌Low-Speed Propeller Series‌

• Suitable for industrial & municipal wastewater aeration tanks, anaerobic tanks, large-scale nitrification/denitrification tanks, disc-type activated sludge tanks, disinfection pools, and industrial mixing. Generates low-shear, open-channel strong water flow, enabling easy creation of:

Large-volume fluid circulation

• Nitrification/denitrification/phosphorus removal phase water flow

Model Designation Methods

‌Operating Conditions‌

• Maximum medium temperature‌: ≤40°C

• pH range of medium‌: 5–9

• Medium density‌: ≤1150 kg/m³

• Maximum submergence depth for continuous operation‌: ≤20 m

Structure of submersible mixer

The QJB submersible mixer is mainly composed of the mixer body, installation system and the electrical control equipment.

According to the function mode, the QJB submersible mixer can be divided into two categories: 1) Mixed-type submersible mixer (corresponding to the direct-connected submersible mixer); 2) Low-speed flow propeller submersible mixer (corresponding to the non-direct-connected submersible mixer).

According to the blade forming method, the QJB submersible mixer is further divided into two subcategories: 1) Casted mixer: The blades (impellers) are formed by casting, and the main body casing is made of cast iron; 2) Stamping mixer: The blades are formed by stamping, and the main body casing is made of stainless steel.

1.Mixed-type submersible mixer

As shown in Figure 1, the direct-connected submersible mixer is mainly composed of two parts: the impeller and the submersible motor, with the impeller directly mounted on the motor shaft. It is generally equipped with a jet ring (its function is to increase axial flow, reduce radial flow, reduce impeller vibration, and improve operation stability); while the low-speed flow propeller submersible mixer is not equipped with such a jet ring.

2.Low-speed flow propeller submersible mixer

As shown in Figure 2, the low-speed flow propeller submersible mixer is mainly composed of three parts: an impeller, a submersible motor, and a speed reduction device. The impeller is mounted on the output shaft of the speed reduction device.

Table 1 Main performance parameters of QJB submersible mixer

Sr.	Model	Power	Current	Speed	Impeller Dia.	Thrust	Weight
1	QJB0.85/8-260/3-740C/S *	0.85	3.2	740	260	163	55
2	QJB1.5/6-260/3- 980C/S*	1.5	3.9	980	260	290	55
3	QJB2.2/8-320/3-740C/S*	2.2	5.9	740	320	582	110
4	QJB4/6-320/3- 980C/S*	4	9.3	980	320	609	115
5	QJB1.5/8-400/3-740/S	1.5	4.5	740	400	600	70
6	QJB2.5/8-400/ -740/S	2.5	7.3	740	400	800	70
7	QJB3/8-400/3-740/S	3.0	8.0	740	400	850	70
8	QJB4/6-400/3-980/S	4.0	9.6	980	400	1200	73
9	QJB4/12-620/3-80/S	4.0	14.5	480	620	1100	184
10	QJB5/12-620/3-480/S	5.0	18.0	480	620	1800	184
11	QJB75/12-620/3-480/S	7.5	26.8	480	620	2600	229
12	QJB10/12-620/3-480/S	10.0	29.3	480	620	2900	229
13	QJB12/12-620/3-480/S	12.0	32.0	480	620	3100	250
14	QJB15/12-620/3-480/S	15.0	42.8	480	620	4200	305
15	QJB18.5/12-620/3-480/S	18.5	55.0	480	620	5300	315
16	QJB22/12-620/3-480/S	22.0	65.0	480	620	6100	335
Note: The models with an asterisk (*) after them are cast mixers, and the rest are punched mixers

Table 2 Main performance parameters of low-speed submersible propeller

Sr.	Model	Power	Current	Speed	Impeller Dia.	Thrust	Weight
1	QJB1.5/4-1100/2-60/B	1.5	3.65	60	1100	680	150
2	QJB2.2/4-1100/2-80/B	2.2	5.05	80	1100	1925	160
3	QJB3/4-1100/2-100/ B	3.0	6.64	100	1100	2240	160
4	QJB414-1100/2- 130/B	4.0	8.62	130	1100	2640	165
5	QJB1.5/4-1400/2-43/B	1.5	3.65	43	1400	650	150
6	QJB2.2/4-1400/2-50/B	2.2	5.05	50	1400	845	160
7	QJB3/4-1400/2-65/B	3.0	6.64	65	1400	1250	160
8	QJB4/4-1400/2-75/ B	4.0	8.62	75	1400	1680	172
9	QJB1.5/4-1600/2-39/B	1.5	3.65	39	1600	680	155
10	QJB2.2/4-1600/2- 43/ B	2.2	5.05	43	1600	910	165
11	QJB3/4-1600/2-51/B	3.0	6.64	51	1600	1548	165
12	QJB4/4-1600/2-62/B	4.0	8.62	62	1600	1810	170
13	QJB1.5/4-1800/2-34/B	1.5	3.65	34	1800	1120	190
14	QJB2.2/4-1800/2-39/B	2.2	5.05	39	1800	1332	200
15	QJB3/4-1800/2-44/B	3.0	6.64	44	1800	1815	200
16	QJB4/4-1800/2-52/B	4.0	8.62	52	1800	2360	280
17	QJB5.5/4-1800/2-62/B	5.5	11.7	62	1800	2820	280
18	QJB2.2/4-2200/2-30/B	2.2	5.05	30	2200	1305	210
19	QJB3/4-2200/2-34/B	3.0	6.64	34	2200	1810	210
20	QJB4/4-2200/2-38/B	4.0	8.62	38	2200	2420	280
21	QJB5.5/4-2200/2-43/B	5.5	11.7	43	2200	2760	290
20	QJB4/4-2200/2-38/B	4.0	8.62	38	2200	2420	280
21	QJB5.5/4-2200/2-43/B	5.5	11.7	43	2200	2760	290
20	QJB4/4-2200/2-38/B	4.0	8.62	38	2200	2420	280
21	QJB5.5/4-2200/2-43/B	5.5	11.7	43	2200	2760	290
22	QJB3/4-2500/2-29/B	3.0	6.64	29	2500	1960	220
23	QJB4/4-2500/2-33/B	4.0	8.62	33	2500	2640	290
24	QJB5.5/ -2500/2-39/B	5.5	11.7	39	2500	2920	290
25	QJB7.5/4- 2500/2-43/B	7.5	15.9	43	2500	3230	300

• Sewage/wastewater/sludge mixing & homogenization

• Thickening processes

• Sludge dewatering

• Heat transfer optimization

• Tank cleaning

• Preventing particle deposition on tank walls/bottoms

• Suspended solids removal

• Anti-icing

• Water flow generation

• Recirculation systems

Features

• Structure and Maintenance: Compact structure, small size, light weight, simple operation and maintenance, convenient installation and overhaul, and long service life.

• Impeller Design: The hydraulic design structure is optimized for high working efficiency; the backward-swept blades have a built-in self-cleaning function, which can prevent debris from winding and clogging.

• Energy Saving and Anti-Settling: When used in conjunction with an aeration system, energy consumption is significantly reduced, oxygen transfer efficiency is notably improved, and sedimentation is effectively prevented.

• Cable Sealing: The unique cable sealing design completely eliminates the risk of water leakage through the cable.

• Motor Protection: The motor windings feature Class F insulation with an IP68 protection rating. High-quality bearings with one-time lubrication and maintenance-free performance are adopted, equipped with oil chamber leakage detection and motor winding overheating protection functions to ensure safe and reliable operation of the motor.

• Mechanical Sealing: Two independent mechanical seals are used, with the friction pair made of corrosion-resistant tungsten carbide; all fasteners are made of stainless steel.

• Anti-Corrosion Technology: Standard components adopt electrolytic separation technology, which can effectively prevent corrosion.

Advantages

Core Advantage	Detailed Benefits
High Efficiency & Self-Cleaning	The hydraulic design features backward-swept blades with a built-in self-cleaning function. This prevents debris from winding or clogging the impeller, ensuring consistent high performance and reducing downtime.
Superior Motor Protection	Engineered for longevity, the motor features Class F insulation with an IP68 protection rating. Built-in sensors for oil chamber leakage and winding overheating provide automatic protection against critical failures.
Energy & Cost Saving	When used in conjunction with aeration systems, the mixer significantly improves oxygen transfer efficiency. This results in drastically reduced energy consumption for the entire treatment process.
Reliable Sealing System	Features a unique cable sealing design to eliminate water leakage risks. The shaft utilizes two independent mechanical seals made of corrosion-resistant tungsten carbide, ensuring a watertight seal even in harsh media.
Easy Maintenance	Designed with a compact structure and light weight. The use of high-quality bearings with one-time lubrication makes the unit virtually maintenance-free, simplifying overhaul and reducing operational costs.
Excellent Anti-Corrosion	Standard components undergo electrolytic separation technology treatment, and the main body is available in Stainless Steel (Stamped version) or Cast Iron, providing strong resistance to corrosive wastewater environments.
Versatile Application	Available in two distinct series (High-Speed Mixing & Low-Speed Flow Propeller), allowing it to flexibly handle everything from sludge homogenization to large-volume fluid circulation in nitrification tanks.

To ensure the best results, please provide the following information:

• Purpose of use;

• Tank shape;

• Tank dimensions, including water depth;

• Medium characteristics: including viscosity, density, temperature, solid content, etc.

The matching power required for the mixer is determined according to the volume, tank size, density and viscosity of the stirring liquid. One or more mixers are used according to specific conditions.

The QJB submersible mixer must work completely submerged in water and cannot work in flammable and explosive environments or environments with highly corrosive liquids! If users have special usage requirements, they can keep in touch with our technical engineering department to provide the best solution.

Description

Specification

Applications

Features＆Advantages

Selection Precautions