Changsha Zhonglian Pump Industry Co., Ltd.

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Having 26 series -312 varieties - over 1000 pump models

Focused on water pump research and development manufacturing for 36 years

Free training for operation and maintenance personnel/free installation guidance/free provision of installation drawings

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QW High-Efficiency Submersible Sewage Pump with No Clogging

QW High-Efficiency Submersible Sewage Pump with No Clogging

Traffic: 10–4500 m³/h

Head: 5-45m

Efficiency: 38%-85%

Power: 1.1-280kw

Rotational speed: 740-2900r/min

Pump weight: 42-2800kg

Price: 0.081–81,500

The QW-type non-clogging sewage pump is a high-efficiency, non-clogging submersible sewage pump developed by Lianquan Pump Industry, a manufacturer of sewage pumps. It is also a sewage pump equipped with an automatic coupling device. Featuring an integrated pump-electric motor design and a down-pump configuration, this pump boasts a large-channel impeller flow passage design. It has an attractive appearance, a rational design, excellent performance, an affordable price, convenient operation and maintenance, a wide range of operating conditions, long service life, and is safe and reliable.

Hotline:

+86 0731-88632200

classification：

Wastewater pump

keyword：

Horizontal Single-Stage Fire Pump

Product consultation

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Product overview Product parameters Why choose us? Frequently Asked Questions

Product Overview

The QW-type non-clogging sewage pump is a high-efficiency, non-clogging submersible sewage pump developed by Lianlian Pump Industry, a manufacturer of sewage pumps. It is a hydraulic machine in which the motor and pump are integrated into a single unit and operate submerged in the medium, with a highly advanced structure, wide-flow passages, and strong sewage-discharging capability. This pump is designed to handle media with temperatures not exceeding 50℃ and a pH range of 4 to 10. It can pass solid particles with diameters ranging from 15 to 110 mm and fibers whose lengths are up to five times the diameter of the pump’s inlet port. This pump is widely used in municipal engineering, construction projects, wastewater discharge in industrial and mining enterprises, as well as in sewage disposal systems for hospitals, hotels, and residential areas.

The non-clogging sewage pump features an integrated pump-electric motor design with a bottom-mounted pump structure and a large-channel impeller flow passage. It boasts a sleek appearance, a rational design, excellent performance, convenient operation and maintenance, a wide range of operating conditions, long service life, and high safety and reliability. The QW pump, based on the WQ pump, incorporates an external cooling water jacket, enabling the pump to cool itself through water circulation and allowing it to operate even in dry-running conditions.

Application Scope and Operating Conditions for QW High-Efficiency Submersible Sewage Pumps with No Clogging

The QW-type non-clogging submersible sewage pump is suitable for conveying liquids containing impurities such as sand, gravel, coal slag, tailings, fibers, and other debris. It is primarily used in industries including metallurgy, mining, thermal power plants, as well as on construction sites, wastewater treatment plants, and sewage treatment ponds for the removal and transportation of wastewater. It serves as an ideal replacement for conventional sewage pumps.

1. The medium temperature shall not exceed 50℃, with a density of 1.0–1.3 kg/m³ and a pH value ranging from 5 to 9.

2. For pumps in systems without internal self-flow circulation, the motor portion shall not extend above 1/2 of the liquid level.

3. In general, the pump must be operated within its rated head range to ensure that the motor is not overloaded. If operation over the full head range is required, this should be explicitly noted at the time of order placement.

4. During operation, the motor current must not exceed the motor’s rated current.

Structural Features of the QW High-Efficiency, Non-Clogging Submersible Sewage Pump

The QW sewage pump consists primarily of a base, a pump body, an impeller, and a submersible motor. It features a unique large-channel impeller design that significantly enhances its ability to pass through debris. The pump employs an internal self-circulation system that uses the medium itself to cool the motor, ensuring safer and more reliable operation. According to user requirements, the pump can be equipped with stator winding temperature protection, bearing temperature protection, and oil chamber leakage protection to further improve its safety. The submersible motor is specially designed with Class F insulation, enabling it to operate safely even under harsh conditions. Additionally, the pump can be fitted with a dual-rail automatic coupling installation system, making the assembly and maintenance of the unit both convenient and quick.

Pump impeller: The pump casing and impeller are carefully selected and matched to ensure excellent flow passage performance, high efficiency, a flat power curve, and resistance to overload. The impeller is precisely balanced, resulting in low vibration and smooth rotation.

Motor: Specially designed submersible motor with IP68 protection and Class F insulation, allowing for high temperature rise yet benefiting from excellent submersible cooling effects, resulting in lower actual temperature rise and extended motor insulation life.

Motor cooling: The heat generated by the motor is dissipated through the motor housing. To ensure reliable and safe operation, the medium must submerge at least half of the stator housing. Motors equipped with water jackets are permitted to operate without water.

Shaft seal: A sealing configuration combining two independent mechanical seals with fluid dynamic seals (patented technology), ensuring safety and zero leakage. The motor shaft seal employs two to three mechanically sealed stages connected in series, creating multiple layers of reliable protection. One seal is located within the pump’s medium, effectively preventing water from entering the oil chamber; the other two seals are situated in the oil chamber, safeguarding against oil leaking into the motor.

Transmission: When viewed from the motor end, the pump rotates clockwise.

The QW-series submersible sewage pumps are available in two installation types: mobile and fixed automatic installation. In the mobile installation type, the pump is supported by a base, and the outlet bend pipe is directly connected to a flexible hose—this setup is both simple and convenient, allowing the pump to be easily moved to different construction sites for use. This installation method is suitable only for pumps with capacities of 75 kW or less. In the fixed installation type, the pump is connected to a coupling device, and the coupling base is securely anchored at the bottom of the pump pit. The pump can move up and down along guide rails. When the pump is lowered, the coupling device automatically engages with the coupling base; when the pump is lifted, the coupling device automatically disengages from the coupling base.

Oil Chamber: The oil chamber is filled with appropriate mechanical oil and equipped with two mechanical seals. The oil chamber serves as a barrier to prevent the medium from leaking from the pump shaft into the motor, thus effectively inhibiting medium penetration into the motor. Should the first mechanical seal leak, the oil chamber acts as a buffer, preventing the medium from directly entering the motor. At the same time, it provides lubrication and cooling for the friction surfaces of the two independent mechanical seals, enhancing their reliability. Additionally, the oil chamber helps dissipate heat generated by the lower bearing and some of the heat produced by the motor itself.

Bearing: The lower bearing provides reliable support for the electric motor pump shaft. Considering the radial, axial forces and pulsating loads generated during pump operation, the lower bearing can consist of one to three sets of bearings of different types. This ensures smooth operation and a longer service life of the unit.

Cables and their seals:

A. The cable is a rubber-sheathed flexible cable resistant to sewage. The cable core cross-section is designed for long-term reliable operation under an ambient temperature of 40℃ and at the motor’s full-load power. If the pump operates with the motor running at less than full-load power or in an ambient temperature below 40℃, its service life will be even longer.

B. A sealing compression device is installed between the cable rubber sleeve and the motor end cover to prevent the medium from leaking into the motor cavity through the interface between the cable and the motor end cover.

C. The rubber vulcanization between the cable jacket and the conductor effectively prevents the medium from entering the motor through the cable jacket.

Motor housing: The motor housing consists of components such as the base, bearing housing, and cover. The individual parts are reliably sealed with static seals at their joints and connections. Each unit undergoes a rigorous hydrostatic pressure test to ensure its watertightness.

Internal safety protection for electric pumps (when required by the customer):

A. Leak Detector: Installed in the oil chamber, it will issue an alarm signal once the leaked medium enters the oil chamber and reaches a certain concentration level.

B. Thermal sensing element: Installed within the motor stator windings, this component monitors the temperature of the motor windings (or detects heating of the motor windings due to other reasons) in case of prolonged motor overload.
When a certain value is reached, an alarm signal is issued.

External control system (user-provided):

This non-clogging sewage pump can be equipped with an automatic water-level control device, intermediate terminals, and a fully automatic protection control cabinet according to user requirements. The dedicated electrical control cabinet included as part of the package can process various signals from within the pump, enabling functions such as control, protection, audible and visual alarms, as well as multiple automated control modes for single-pump and multi-pump systems.

Performance Curve and Key Parameters: The curves on the performance curve indicate the recommended operating range for the pump. When the flow rate or medium being pumped changes, it is essential to ensure that the shaft power during operation remains within the motor’s rated power range. If overload operation is detected, it could lead to motor burnout.

Product Parameters

Performance Parameters of QW High-Efficiency Submersible Sewage Pump with No Clogging

Model	Traffic	Head height	Efficiency	Shaft power	Rotational speed	Weight	Motor power
Model	(m³/h)	(m)	(%)	(kw)	(rpm)	(kg)	(kW)
50WQ(QW)10-7-0.75	10	7	45	0.42	2900	21Kg	0.75kW
50WQ(QW)10-15-1.5	10	15	51	0.8	2900	45Kg	1.5kW
50WQ(QW)9-22-2.2	9	22	46	1.17	2900	50Kg	2.2kW
50WQ(QW)15-15-2.2	15	15	51	1.2	2900	50Kg	2.2kW
50WQ(QW)25-15-3	25	15	52	1.97	2900	52Kg	3kW
50WQ(QW)15-32-4	15	32	49	2.67	2900	55Kg	4kW
50WQ(QW)25-22-4	25	22	52	2.88	2900	56Kg	4kW
50WQ(QW)18-32-5.5	18	32	49	3.2	2900	95Kg	5.5kW
50WQ(QW)15-50-7.5	15	50	49	4.17	2900	98Kg	7.5kW
50WQ(QW)20-40-7.5	20	40	50.5	4.32	2900	98Kg	7.5kW
80WQ(QW)10-10-1.5	10	10	51	0.53	2900	45Kg	1.5kW
80WQ(QW)30-10-2.2	30	10	53	1.54	2900	50Kg	2.2kW
80WQ(QW)40-7-2.2	40	7	54	1.41	2900	50Kg	2.2kW
80WQ(QW)50-10-3	50	10	56	2.43	2900	53Kg	3kW
80WQ(QW)50-12-4	50	12	56	2.92	2900	60Kg	4kW
80WQ(QW)30-32-7.5	30	32	52.5	4.98	2900	95Kg	7.5kW
80WQ(QW)50-65-22	50	65	56	15.81	2900	390Kg	22kW
100WQ(QW)100-7-4	100	7	60	3.18	2900	65Kg	4kW
100WQ(QW)30-22-5.5	30	22	53	3.39	2900	95Kg	5.5kW
100WQ(QW)65-15-5.5	65	15	56.5	4.7	2900	110Kg	5.5kW
100WQ(QW)100-10-5.5	100	10	60	4.54	2900	110Kg	5.5kW
100WQ(QW)50-22-7.5	50	22	56	5.35	2900	98Kg	7.5kW
100WQ(QW)40-35-11	40	35	55	6.94	1450	279Kg	11kW
100WQ(QW)70-22-11	70	22	57	7.36	1450	278Kg	11kW
100WQ(QW)80-30-15	80	30	61	10.72	1450	360Kg	15kW
100WQ(QW)80-65-30	80	65	61	23.23	2900	430Kg	30kW
150WQ(QW)140-7-5.5	140	7	62	4.31	2900	99Kg	5.5kW
150WQ(QW)145-10-7.5	145	10	62	6.37	2900	110Kg	7.5kW
150WQ(QW)130-15-11	130	15	61	8.71	1450	288Kg	11kW
150WQ(QW)200-10-11	200	10	66	8.26	1450	282Kg	11kW
150WQ(QW)140-18-15	140	18	73	9.41	1450	360Kg	15kW
150WQ(QW)150-22-18.5	150	22	63	14.27	980	520Kg	18.5kW
150WQ(QW)130-30-22	130	30	62	17.14	1450	520Kg	22kW
150WQ(QW)200-22-22	200	22	65	18.45	980	540Kg	22kW
150WQ(QW)100-40-30	100	40	59	18.47	980	880Kg	30kW
150WQ(QW)200-30-30	200	30	63	25.95	980	900Kg	30kW
150WQ(QW)140-45-37	140	45	61	28.14	980	1150Kg	37kW
150WQ(QW)250-30-37	250	30	68	30.06	980	1150Kg	37kW
150WQ(QW)150-60-55	150	60	61	40.2	980	1260Kg	55kW
150WQ(QW)200-65-75	200	65	63	56.23	980	1720Kg	75kW
200WQ(QW)360-6-11	360	6	66	8.92	1450	354Kg	11kW
200WQ(QW)400-7-15	400	7	68	11.22	1450	380Kg	15kW
200WQ(QW)250-15-18.5	250	15	66	15.48	1450	570Kg	18.5kW
200WQ(QW)400-10-18.5	400	10	74	14.73	980	530Kg	18.5kW
200WQ(QW)450-12-22	450	12	74	19.89	980	560Kg	22kW
200WQ(QW)300-22-37	300	22	65	27.67	980	1100Kg	37kW
200WQ(QW)450-22-45	450	22	67	40.26	980	1400Kg	45kW
200WQ(QW)250-40-55	250	40	64	42.58	1450	1380Kg	55kW
200WQ(QW)400-34-55	400	34	73	50.77	980	1480Kg	55kW
200WQ(QW)350-45-75	350	45	66	65.03	980	1600Kg	75kW
200WQ(QW)350-50-90	350	50	66	72.25	1450	1550Kg	90kW
200WQ(QW)250-70-110	250	70	64	74.51	980	1900Kg	110kW
250WQ(QW)250-17-22	250	17	71	16.31	980	820Kg	22kW
250WQ(QW)400-15-30	400	15	68	24.04	980	900Kg	30kW
250WQ(QW)700-10-30	700	10	74	25.78	980	900Kg	30kW
250WQ(QW)500-15-37	500	15	76	26.89	980	1050Kg	37kW
250WQ(QW)600-15-45	600	15	72	34.06	980	1450Kg	45kW
250WQ(QW)800-22-75	800	22	71	67.55	980	1520Kg	75kW
250WQ(QW)600-35-90	600	35	74	77.33	980	1800Kg	90kW
250WQ(QW)500-45-110	500	45	68	90.17	740	2000Kg	110kW
300WQ(QW)750-5-18.5	750	5	76	13.45	980	680Kg	18.5kW
300WQ(QW)700-6-22	700	6	72	15.9	980	820Kg	22kW
300WQ(QW)900-15-55	900	15	77	47.78	980	1350Kg	55kW
300WQ(QW)1000-22-90	1000	22	76	78.88	980	1820Kg	90kW
300WQ(QW)500-55-132	500	55	67	111.85	1450	2000Kg	132kW
300WQ(QW)700-60-185	700	60	70.5	162.34	1450	3000Kg	185kW
350WQ(QW)940-8-30	940	8	72	28.46	980	1150Kg	30kW
350WQ(QW)1200-6-37	1200	6	72	27.25	980	1250Kg	37kW
350WQ(QW)1100-10-45	1100	10	78	38.43	980	1500Kg	45kW
350WQ(QW)1200-10-55	1200	10	72	45.42	980	1350Kg	55kW
350WQ(QW)1200-15-75	1200	15	72	68.12	980	1800Kg	75kW
350WQ(QW)1200-18-90	1200	18	72	81.75	980	2000Kg	90kW
350WQ(QW)1000-28-132	1000	28	73	104.52	740	2800Kg	132kW
350WQ(QW)1000-31-160	1000	31	72	117.33	740	3150Kg	160kW
350WQ(QW)850-60-250	850	60	71	195.74	980	4600Kg	250kW
400WQ(QW)1000-6-30	1000	6	72	22.71	980	1200Kg	30kW
400WQ(QW)1900-6-55	1900	6	75	41.42	740	1930Kg	55kW
400WQ(QW)2000-8-75	2000	8	80	54.5	740	2150Kg	75kW
400WQ(QW)2000-13-110	2000	13	75.5	93.84	740	2670Kg	110kW
400WQ(QW)2200-15-132	2200	15	76	118.32	740	2670Kg	132kW
400WQ(QW)1600-26-160	1600	26	76	149.16	740	3200Kg	160kW
400WQ(QW)1700-32-200	1700	32	82.5	179.68	740	3850Kg	200kW
400WQ(QW)1900-32-250	1900	32	75	220.91	740	4200Kg	250kW
400WQ(QW)1500-47-280	1500	47	75	256.15	980	4750Kg	280kW
500WQ(QW)2100-10-90	2100	10	75.5	75.79	980	2160Kg	90kW
500WQ(QW)2600-16-160	2600	16	84	134.95	740	3200Kg	160kW
500WQ(QW)3000-14-160	3000	14	85	134.65	740	3200Kg	160kW
500WQ(QW)2400-22-220	2400	22	76	189.32	740	4280Kg	220kW
500WQ(QW)2700-24-250	2700	24	80	220.72	740	4500Kg	250kW
500WQ(QW)3000-24-280	3000	24	77.5	253.16	740	4800Kg	280kW
500WQ(QW)2400-30-300	2400	30	84	233.57	740	5200Kg	300kW
500WQ(QW)3000-35-400	3000	35	84	340.62	740	6100Kg	400kW
550WQ(QW)3500-7-110	3500	7	78.5	85.05	740	3100Kg	110kW
550WQ(QW)3000-10-132	3000	10	77.5	105.48	740	2900Kg	132kW
550WQ(QW)4000-15-220	4000	15	83.5	195.81	740	4400Kg	220kW
550WQ(QW)4000-30-450	4000	30	85	384.71	740	6800Kg	450kW
600WQ(QW)3600-12-185	3600	12	78.5	149.96	740	3200Kg	185kW
600WQ(QW)5800-10-250	5800	10	81	195.12	740	4600Kg	250kW
600WQ(QW)6000-15-355	6000	15	82	299.09	740	5800Kg	355kW
600WQ(QW)5500-25-560	5500	25	84	446.06	740	7900Kg	560kW

Friendly reminder: Click on the specific model series above to view more detailed specifications and performance curves, among other information.

Why choose us?

Changsha Zhonghlian Pump Industry Co., Ltd. was founded in 1989 and was independently established after the restructuring of Changsha Water Pump Factory. It is a comprehensive national high-tech enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Equity Exchange on December 31, 2019, with the abbreviation "Zhonghlian Pump Industry" and the equity code: 600275HN. It is currently a key backbone enterprise in China's centrifugal pump industry and one of the major professional manufacturers of multi-stage pumps in the country. The headquarters is located in Changsha City, Hunan Province, a historical and cultural city in China.

41000 m²

Square meters of land area

100 %

100% factory pass rate

41000 m²

Square meters of land area

100 %

100% factory pass rate

What is your typical delivery time?

Models in stock can be shipped the next day at the latest. All others are custom-made, with lead times generally ranging from 7 to 90 days depending on the product size and project specifics. Please contact our sales manager for details: 0731-88632200 。

Do you have centrifugal pumps in stock?

Centrifugal pumps come in numerous models and configurations. Except for a small number of high-volume, standard models that are in stock, the vast majority are not stocked and are customized products. We need to select a pump based on your site's flow rate, head, media temperature, pH value, and installation conditions, etc., to determine the pump model and configuration before we can submit an order to the factory for production.

What information should I provide when requesting a quote?

Generally, to obtain an accurate quotation, we recommend providing us with the following information: pump flow rate, head, on-site operating voltage and frequency, temperature, pH value, and solid particle content of the fluid being conveyed, and on-site installation conditions (horizontal or vertical installation), etc.

If you are not sure, don't worry, our business managers will assist you in determining this.

What products do you mainly produce?

Zhonglian Pump Industry manufactures various large industrial centrifugal pumps. Main products include: self-balancing multi-stage pumps, multi-stage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condensate pumps, etc.

Could you help me with the selection?

Certainly! If the water pump model is not selected accurately, there will be big problems. If you choose a smaller one, it won't meet your needs; if you choose a larger one, it will waste electricity and fuel, increasing your costs.

Why is it so slow to get a price quote?

Because centrifugal pumps are non-standard customized products with many models, the price range is also very large. Even for the same model, the price difference is also very large due to different materials and configurations. Taking the most common water pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clarify the relevant information to give you an accurate price. Normally, if you provide relatively comprehensive information, we can quote within 5 minutes.

JYWQ Model Automatic Stirring Submersible Sewage Pump

None

JYWQ Model Automatic Stirring Submersible Sewage Pump

None

+86 0731-88632200

Export Trade/Technical Support:

+86 153-4831-2290

Head Office Email:

zoomlian@yeah.net

No. 210, Huanbao Zhong Road, Yuhua District, Changsha City, Hunan Province, Leowoju Wisdom Valley Building B, 8th Floor

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