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

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BQS Series Mine-Proof Explosion-Proof Submersible Sewage and Sand-Removal Pump

BQS Series Mine-Proof Explosion-Proof Submersible Sewage and Sand-Removal Pump

Traffic: 100–2500 m³/h

Head: 7-700m

Power: 2.2-315kw

Efficiency: 28.9–68.5%

Price: 2.89–888,800

Hotline:

+86 0731-88632200

classification：

Submersible pump

keyword：

Horizontal Single-Stage Fire Pump

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Product overview Product parameters Why choose us? Frequently Asked Questions

Product Overview

　　The BQS series explosion-proof submersible sewage and sand-discharging pumps for mining applications are highly efficient, energy-saving, “bottom-suction” explosion-proof submersible pumps designed, developed, and manufactured in accordance with the explosion-proof standard MT/T671-2005, "Explosion-Proof Submersible Pumps for Coal Mines." Specifically tailored to address the characteristics of coal mines—where large amounts of coal slurry are present—these pumps have successfully resolved key technical challenges related to product structure, parameter optimization, manufacturing processes, operational efficiency, sealing and leak-proof performance, and material selection. Compared with similar domestic products, they offer numerous advantages, including high safety and reliability, lightweight and practical design, excellent sewage and sand-discharging performance, long service life, a well-organized product range, convenient model selection, durable double-sided sealing, enhanced safety and reliability, and strong adaptability. They also feature superior explosion-proof structural performance and a high degree of protection, making them ideal for use in underground mining faces and roadways in mines where explosive gases such as methane or coal dust are present, and thus suitable for pairing with water pumps in potentially explosive environments.

Explosion-proof submersible pump for mining

　　The BQS submersible sewage and sand-discharge pumps for mining applications feature a comprehensive range of specifications, with power ratings spanning from 2.2 kW to 315 kW, flow rates ranging from 10 m³/h to 2,500 m³/h, and head capacities from 7 m to 700 m. All models achieve full-head performance without overload, enabling versatile multi-purpose operation and providing users with great convenience while saving energy by more than 10%. To ensure the pump can operate both with and without water, we have designed this product with a double-layer, highly efficient cooling structure. As a result, this series of submersible pumps fully meets the requirements for use in coal mine underground environments.

Meaning of Model Designations for the BQS Series Mine-Explosion-Proof Submersible Slurry and Sand Discharge Pumps

Meaning of Model Designations for the BQS Series Mine-Explosion-Proof Submersible Slurry and Sand Discharge Pumps

Main Applications and Operating Conditions of the BQS Series Explosion-Proof Submersible Sewage and Sand-Removal Pump for Mining Use

　　Main uses:

　　The mine-use submersible sewage and sand-discharging pump is an advanced and reliable drainage tool suitable for use in working faces, roadways, bottom water pits, localized water accumulation areas, coal preparation plant drainage, engineering drainage, and other similar applications. It is particularly well-suited for underground coal mines where there is a risk of methane (commonly known as "gas") and coal dust explosions. This pump can handle mixed wastewater containing insoluble solid particles such as sand, coal slurry, coal gangue, coal ash, and fibrous materials. It is also applicable to drainage applications in buildings, hospitals, residential communities, municipal projects, road and traffic infrastructure and their construction sites, as well as factory wastewater discharge and small-scale wastewater treatment systems—effectively handling wastewater, rainwater, and sewage containing solid particles and long fibers.

　　1. Power supply: 380V, 660V, or 1140V, three-phase, 50Hz.

　　2. The medium temperature generally does not exceed 40℃, the pH value is between 5 and 9, and the medium specific weight is ≤11 kN/m³.

　　3. The diameter of solid particles in the medium shall comply with the provisions of MT/T 671-2005. Please remind us of any special requirements when placing your order.

Structural Features of the BQS Series Explosion-Proof Submersible Sewage and Sand-Removal Pump for Mining Applications

　　Structural features of submersible pumps:

　　1. Model Selection: Performance optimized, operates smoothly without blockages, boasts strong capabilities for sludge and sand removal, and features overload-free operation (with full-head characteristics—meaning that at any operating point, the input power never exceeds the rated power of the matched motor). Suitable for various underground coal mine applications and capable of multi-purpose use with a single unit.

　　2. Mechanical seal improvements: Adoption of independent series mechanical seals and double-face mechanical seals.

　　3. Structural Optimization: The structural design enhances the sealing performance of the mechanical seal, ensures smooth operation, and improves reliability. The optimized design is lighter, more practical, and consumes less energy. It can operate continuously in dry conditions without water for extended periods.

　　4. The IPX88 motor protection rating ensures excellent cooling performance for submersible motors, resulting in lower temperature rise compared to conventional motors and further enhancing durability. Class F insulation significantly extends the motor’s service life.

　　Structural Description:

　　The pump features a vertical, fully submersible design with an integrated electromechanical structure. It employs a bottom-suction water intake method and is capable of completely draining and removing shallow surface water from the working face. The product consists primarily of two major components: the flow-path parts and the motor. According to the method of liquid discharge, electric pumps can be further classified into external-mount, internal-mount, and semi-internal-mount types.

　　1. Pump Casing and Impeller: Based on rigorous experimental testing, the pump casing and impeller have been carefully selected and matched to ensure excellent anti-clogging performance, strong flow capacity, high efficiency, a flat power curve, and no overload. The impeller is precisely balanced, resulting in low vibration and smooth operation.

　　2. Motor: A specially designed submersible motor with IPx8 protection and Class F insulation, allowing for a higher temperature rise. Under normal temperature-rise conditions, the motor’s insulation life is extended, while its submersible cooling effect is excellent, resulting in a lower actual temperature rise and further prolonging the motor’s insulation life.

　　3. Motor Cooling: (1) External-mounted electric pump: Heat generated by the motor is dissipated through the pump casing. As long as the medium submerges half of the motor stator casing, the pump can operate reliably and safely. The greater the degree of submersion, the more favorable it is for motor cooling. (2) Internal-mounted electric…

　　The submersible sludge pump features a sandwich-type, highly efficient cooling structure. Even when the motor runs idle, its temperature rise can be kept below 40°C, significantly extending the service life of the entire unit. This pump is ideal for applications with shallow water levels. The product can run idly for extended periods even in the absence of water, making it suitable for unattended environments and thereby reducing labor costs.

　　4. Shaft Seal: The motor shaft seal employs two independently arranged mechanical seals connected in series, forming a reliable dual-sealing barrier. The first seal is located within the pump’s medium; as the medium pressure increases, its sealing surfaces are pressed more tightly, effectively preventing water from entering the oil chamber. The second seal is situated in the oil chamber, preventing oil from leaking into the motor. Even if the first seal fails—since its operating conditions are slightly harsher than those of the second seal—the second seal can still reliably prevent both oil and water from entering the motor. The bellows-type mechanical seal, combined with an innovative structural cavity design, further significantly enhances the reliability of the shaft seal. Under normal operating conditions, the seal can run without failure for over 2,000 hours.

　　5. Oil Chamber: This serves as a barrier to prevent the medium from leaking from the pump shaft into the motor, thus inhibiting the medium from penetrating into the motor. If the first mechanical seal starts to leak, the oil chamber acts as a buffer, preventing the medium from directly entering the motor. At the same time, it lubricates and cools the friction surfaces of the two independent mechanical seals, ensuring reliable operation of the seals. In addition, the oil chamber also helps dissipate heat generated by the lower bearing and some of the heat from the motor itself.

　　6. Bearings: The double-row angular contact bearings at the lower end provide strong load-carrying capacity and, together with the deep-groove bearings at the upper end, form a reliable support for the motor-pump shaft. These bearings offer ample margin of safety to handle radial forces, axial forces, and other loads generated during pump operation, ensuring smooth unit operation and a long service life.

　　7. Cables and Their Sealing: (1) The cables shall be flame-retardant cables for coal mines conforming to MT818.5-2009. The cross-sectional area of the cable conductors is designed for long-term reliable operation under an ambient temperature of 40°C and at the motor’s full-load power rating. If the motor operates at less than full load or at an ambient temperature below 40°C, the service life of the cable will be even longer. (2) A sealing compression is provided between the cable’s rubber sheath and the motor’s end cover to prevent media from seeping into the motor cavity through the interface between the cable and the motor cover.

　　8. Motor Housing: The motor housing consists of the housing shell, upper end cover, lower end cover, and other components. The joints between these parts feature reliable static seals. Each unit undergoes rigorous hydrostatic testing to ensure absolutely leak-proof performance.

　　9. Dedicated handle: Equipped with a dedicated handle for easy carrying; do not use the cable itself as a handle when moving the device.

　　The externally mounted sewage submersible pump is designed with a down-pump configuration, featuring an outlet located at the lower part of the entire unit. Water is discharged directly from the pump body through this outlet. This type of pump typically features a single-stage, single-suction design with motor power ratings generally below 22 kW. Its notable characteristics include a simple structure, lightweight and practical design, strong capacity to handle dirty water, and suitability for applications involving water containing high levels of impurities, coal slurry, and sand/gravel.

　　The integrated structural design of the submersible sand-discharging electric pump features a vertical, down-pump configuration and incorporates an internal motor design. The motor housing is equipped with a double-layer structure: during normal drainage, the water pumped by the unit flows through the interlayer and exits from the top, thereby cooling the motor via water circulation. Even in the event of a water supply interruption, the outer interlayer of the motor continues to provide water-based cooling, ensuring that the motor does not overheat and get damaged. This design eliminates the need for dedicated personnel to monitor the pump, significantly reducing labor costs. Most of our single-stage and multi-stage pumps adopt this internal-motor structure.

　　The BQS semi-enclosed submersible sand-discharge pump for mining combines the advantages of both internal and external pumps. It is relatively lightweight and ensures that the motor remains adequately cooled even in the event of water supply interruption.

Product Parameters

Parameter Table for BQS Series Explosion-Proof Submersible Sewage and Sand-Removal Pumps for Mining Applications

Model	Traffic	Head height	Power	Voltage	Rotational speed	Outlet diameter
Model	m³/h	m	kilowatt	v	r/min	mm
BQS10-28-2.2	10	28	2.2	380/660/1140	3000	40
BQS15-22-2.2	15	22				40
BQS25-10-2.2	25	10				40
BQS35-7-2.2	35	7				65
BQS15-25-3	15	25	3	380/660/1140	3000	40
BQS20-22-3	20	22				40
BQS25-15-3	25	15				40
BQS13060	35	10				65
BQS15-30-4/N	15	30	4	380/660/1140	3000	40
BQS20-25-4/N	20	25				40
BQS25-18-4/N	25	18				40
BQS50-15-4	50	15				65
BQS15-50-5.5	15	50	5.5	380/660/1140	3000	40
BQS20-40-5.5/N	20	40				40
BQS30-30-5.5	30	30				50
BQS70-10-5.5	70	10				100
BQS100-7-5.5	100	7				100
BQS15-70/2-7.5/N	15	70	7.5	380/660/1140	3000	40
BQS20-50-7.5/N	20	50				40
BQS30-36-7.5	30	36				50
BQS50-30-7.5	50	30				65
BQS70-16-7.5	70	16				100
BQS100-10-7.5	100	10				100
BQS20-65-11/N	20	65	11	380/660/1140	3000	40
BQS30-55-11/N	30	55				50
BQS40-40-11/N	40	40				65
BQS45-32-11/N	45	32				65
BQS50-30-11/N	50	30				65
BQS80-20-11	80	20			1500	100
BQS100-15-11	100	15				100
BQS140-10-11	140	10				150
BQS210-7-11	210	7				150
BQS20-80-15/N	20	80	15	380/660/1140	3000	40
BQS32-60-15/N	32	60				50
BQS40-50-15/N	40	50				65
BQS60-30-15/N	60	30				65
BQS80-25-15	80	25			1500	100
BQS100-22-15	100	22			1500	100
BQS20-100/2-18.5/N	20	100	18.5	380/660/1140	3000	40
BQS30-70-18.5/N	30	70				50
BQS70-35-18.5/N	70	35				80
BQS100-30-18.5	100	30			1500	100
BQS30-100/2-22/N	30	100	22	380/660/1140	3000	50
BQS40-80/2-22/N	40	80				65
BQS60-50-22/N	60	50				80
BQS80-40-22/N	80	40				100
BQS100-35-22	100	35			1500	100
BQS150-22-22	150	22			1500	150
BQS30-130/2-30/N	30	130	30	380/660/1140	3000	50
BQS50-100-30/N	50	100				65
BQS60-80-30/N	60	80				80
BQS80-55-30/N	80	55				100
BQS120-50-30	120	50			1500	100
BQS200-22-30	200	22			1500	150
BQS30-150/2-37/N	30	150	37	380/660/1140	3000	50
BQS60-100-37/N	60	100				80
BQS80-80-37/N	80	80				100
BQS100-60-37/N	100	60				100
BQS150-32-37	150	32			1500	150
BQS200-30-37	200	30			1500	150
BQS30-170/2-45/N	30	170	45	380/660/1140	3000	50
BQS50-150/2-45/N	50	150				65
BQS60-120-45/N	60	120				80
BQS70-100-45/N	70	100				80
BQS130-60-45/N	130	60				150
BQS300-30-45/B	300	30			1500	150
BQS50-170/3-55/N	50	170	55	380/660/1140	3000	65
BQS85-100-55/N	85	100				100
BQS120-80-55/N	120	80				100
BQS200-60-55/N	200	60				150
BQS50-200/3-75/N	50	200	75	380/660/1140	3000	65
BQS100-100-75/N	100	100				100
BQS150-80-75/N	150	80				150
BQS200-70-75/N	200	70				150
BQS240-40-75/B	240	40			1500	150
BQS300-35-75/B	300	35			1500	150
BQS50-240/3-90/N	50	240	90	380/660/1140	3000	65
BQS80-180/3-90/N	80	180				100
BQS180-90-90/N	180	90				150
BQS220-70-90/N	220	70				150
BQS300-50-90/B	300	50			1500	150
BQS500-35-90/B	500	35			1500	200
BQS80-200/2-110/N	80	200	110	380/660/1140	3000	100
BQS100-180/2-110/N	100	180				100
BQS200-100-110/N	200	100				150
BQS300-70-110/N	300	70				150
BQS400-60-110/B	400	60			1500	200
BQS600-30-110/B	600	30			1500	200
BQS50-300/4-132/N	50	300	132	380/660/1140	3000	100
BQS150-150/2-132/N	150	150				150
BQS240-100-132/N	240	100				150
BQS300-80-132/N	300	80				150
BQS700-40-132/B	700	40			1500	200
BQS800-35-132/B	800	35			1500	250
BQS60-360/5-160/N	60	360	160	380/660/1140	3000	100
BQS100-240/3-160/N	100	240				100
BQS180-170/2-160/N	180	170				150
BQS280-100-160/N	280	100				150
BQS500-60-160/B	500	60			1500	200
BQS600-50-160/B	600	50				200
BQS1000-30-160/B	1000	30				300
BQS1200-25-160/B	1200	25				300
BQS80-350/4-185/N	80	350	185	380/660/1140	3000	100
BQS100-280/3-185/N	100	280				100
BQS160-200/2-185/N	160	200				150
BQS300-100-185/N	300	100				150
BQS600-60-185/B	600	60			1500	200
BQS800-50-185/B	800	50				250
BQS900-40-185/B	900	40				250
BQS80-400/4-200/N	80	400	200	380/660/1140	3000	100
BQS100-320/4-200/N	100	320				100
BQS200-200/2-200/N	200	200				150
BQS320-120-200/N	320	120				150
BQS1100-35-200/B	1100	35			1500	300
BQS1200-30-200/B	1200	30				300
BQS1500-25-200/B	1500	25				300
BQS80-450/5-220/N	80	450	220	380/660/1140	3000	100
BQS150-270/3-220/N	150	270				150
BQS180-220/2-220/N	180	220				150
BQS240-180/2-220/N	240	180				150
BQS100-400/4-250/N	100	400	250	380/660/1140	3000	100
BQS150-300/3-250/N	150	300				150
BQS180-250/3-250/N	180	250				150
BQS300-160/2-250/N	300	160				150
BQS380-120-250/N	380	120				200
BQS450-100-250/N	450	100				200
BQS100-450/5-280/N	100	450	280	380/660/1140	3000	100
BQS150-340/4-280/N	150	340				150
BQS200-270/3-280/N	200	270				150
BQS260-200/2-280/N	260	200				150
BQS320-170/2-280/N	320	170				150
BQS400-140/2-280/N	400	140				200
BQS100-500/5-315/N	100	500	315	380/660/1140	3000	100
BQS140-380/4-315/N	140	380				150
BQS200-300/3-315/N	200	300				150
BQS260-240/3-315/N	260	240				150
BQS340-180/2-315/N	340	180				200
BQS500-120-315/N	500	120				200

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.

WQB Series Explosion-Proof Submersible Sewage Pump

Hot water submersible pump for deep wells

WQB Series Explosion-Proof Submersible Sewage Pump

Hot water submersible pump for deep wells

+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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