Puede fabricar 26 series de productos, incluyendo bombas de circulación para grandes centrales eléctricas, bombas de condensación para grandes centrales eléctricas, bombas petroquímicas, bombas multietapa, bombas de aguas residuales y lodo, bombas multietapa autoequilibradas, bombas de doble succión y única etapa tipo split, y bombas centrífugas de succión simple y única etapa.
La elección de más de cientos de miles de clientes, cubriendo industrias como minería de carbón, metalurgia, química, energía, recursos hídricos, alimentos, municipalidades y protección ambiental, y exportando a Asia Sudeste, África, América y otros lugares.
La empresa fue la primera en la industria en obtener las certificaciones internacionales del sistema de calidad ISO 9001:2008, del sistema de gestión ambiental ISO 14001 y del sistema de gestión de seguridad y salud ocupacional GB/T 28001, además de la certificación API 610 de la Asociación Estadounidense del Petróleo.
La empresa, fundada en 1989, es una empresa nacional de alta tecnología integral que integra diseño, investigación y desarrollo, fabricación y servicios; actualmente es una empresa clave en la industria china de bombas centrífugas y una de las grandes fábricas especializadas.
Con productos innovadores, calidad excepcional y servicios integrales, buscamos la verdad y la pragmática, avanzamos con iniciativa, y nos esforzamos por lograr el objetivo de ser "la marca líder en el campo de aplicación de bombas centrífugas en el país"! Raigada en Hunan, orientada a todo el país y hacia el mundo!
As one of the most recognized national manufacturers of multistage centrifugal pumps, our company, to actively respond to the national call for energy savings and adherence to the sustainable development path, after studying and adopting advanced technologies from similar foreign products, and combining with years of experience in pump design, has developed a series of high-efficiency and energy-saving self-balancing multistage centrifugal pumps. This series of multistage pumps uses a hydraulic model recommended by the state, developed according to the API610 standard, with advantages such as high energy efficiency, a wide performance range, reasonable structure, good cavitation performance, safe and stable operation, low noise, few wear parts, and easy installation and maintenance, positioning itself at the technological forefront of the industry.
The self-balancing multistage centrifugal pump innovates the traditional structure of multistage pumps, eliminating the axial force balancing device of common multistage pumps, and uses the mutual cancellation of the forces of the symmetrically arranged rotor components to balance the axial force, effectively solving the axial displacement. During operation, there is no efficiency loss caused by the friction of the balancing disc or by backflow, increasing efficiency by 3-12% compared to common multistage pumps of the same category. In addition, it completely resolves failures such as wear or blockage of the disc and balancing seat due to failures of the balancing device, significantly prolonging the pump's service life. After years of use by users, it has been proven that our self-balancing multistage pumps have much greater reliability and efficiency than traditional multistage pumps, with a fault-free operating time more than three times greater, effectively extending the service life, which not only saves production costs directly for users but also significantly reduces operating and maintenance costs. The MDP type self-balancing multistage centrifugal pump is a wear-resistant multistage pump with outstanding anti-corrosive properties, with flow passage components made of wear-resistant materials, durable, with uniform flow, a wide range of flow and height, and reliable operation. It is suitable for transporting media with a certain percentage of solid particles and high abrasiveness, especially indicated for drainage in coal mines or other mines, being an ideal equipment for mining drainage.
Our company has more than 30 years of experience in manufacturing multistage centrifugal pumps. The series of self-balancing multistage centrifugal pumps of type MDP that we develop and produce has obtained safety certification for coal mines, being one of the leading national companies in the production of multistage pumps for mining, with reliable quality products and providing comprehensive service from the pump head to the motor, pump accessories, and commissioning.
Application scope of the wear-resistant self-balancing multistage centrifugal pump MDP
Suitable for transporting medium mine water, slag water, wastewater, sewage, and other liquids with similar physical and chemical properties, with particle content ≤1.5%, particle size ≤1.3mm, and temperature from -20℃ to 80℃.
On-site photograph of the MDP type self-balancing multistage centrifugal pump
Structural description of the wear-resistant self-balancing multistage centrifugal pump MDP
The MDP type self-balancing multistage centrifugal pump has support at both ends, the casing is segmented, and the pump drive is connected to the motor via a pin elastic coupling.
Direction of rotation of the pump: viewed from the drive end, the pump rotates clockwise.
1. Stator part
Mainly composed of the suction section (water inlet), middle section, discharge section (water outlet), guide vanes, secondary water inlet section, packing seal body (rear cover) and Bearing Body, connected together by tension bolts. Viewed from the coupling end, the pump inlet is horizontally oriented to the right and the outlet vertically upwards.
2. Rotor part
Mainly composed of shaft, impeller, throttling shaft components, bearings, and bushings.
3. Pump sealing
3.1 The static joint surfaces between the suction section (water inlet), middle section, discharge section (water outlet), and secondary water inlet section are sealed with sealing adhesive or molybdenum disulfide.
3.2 Throttling sealing is used between the stages of the pump.
3.3 The shaft seals on both sides of the pump use soft packings.
3.4 A water retaining ring is used to prevent water from entering the bearings.
4. Bearing part
The complete rotor of the pump is supported by a cylindrical roller bearing at the drive end according to the "GB/T283-94" standard and an angular contact ball bearing at the opposite end according to the "GB/T292-94" standard. The bearings are lubricated with mechanical oil CD30 or CD40 added to the bearing body up to the center of the oil sight glass. Due to the use of the angular contact ball bearing "GB/T292-94", the assembled rotor does not exhibit axial displacement.
Principle of operation of the wear-resistant self-balancing multistage centrifugal pump MDP
Self-balancing multistage centrifugal pump VS traditional multistage centrifugal pump 10 major advantages
1. New structure: The self-balancing multistage centrifugal pump has rotor components with impellers arranged symmetrically, so that the axial forces generated by the impeller groups in the positive and negative directions cancel each other out, eliminating the balance disk device that has small clearances, high pressure drop, easy erosion, wear, and failures, surpassing the traditional structure of multistage pumps.
2. New technology: The self-balancing multistage pump has unique throttling devices, pressure reduction, and balancing devices in odd stages, which also act as auxiliary support.
3. High energy efficiency: The self-balancing multistage centrifugal pump uses an advanced hydraulic model to solve the wear and axial pulsation caused by the balance disk, always maintaining an excellent alignment state between the impeller and the guide vanes. During prolonged use, it also avoids significant efficiency loss caused by the wear of the balance disk and the forward displacement of rotor components in common multistage pumps, in addition to eliminating balance water leakage, reducing volumetric loss, generally improving the operational efficiency of the pump and reducing shaft power, with an average efficiency 3%-12% higher than that of common multistage pumps.
4. High reliability: The self-balancing multistage centrifugal pump uses a self-balancing system that basically cancels the axial force load generated during the operation of the pump, minimizing rotor wear and system interference. A small residual part of the axial force is supported by the thrust bearing, keeping the pump shaft always under tension, with a uniform force distribution and a significant reduction in the peak stress compared to the prototype structure, which improves the rigidity and critical speed of the rotor, significantly increasing the stability and reliability of the pump rotor operation.
5. High stability: The self-balancing multistage centrifugal pump, through the excellent symmetrical combination of the impeller and guide vanes, as well as a reasonable coupling arrangement and a wide axial throttling design, maintains high stability and operational efficiency even after prolonged operation.
6. Good performance against cavitation: The self-balancing multistage centrifugal pump uses an optimized hydraulic model and structural design, with a double suction structure in the first stage of the impeller, along with precise casting and wear-resistant materials, which gives it good performance against cavitation. The machine operates stably and with low noise, without the user needing to install an additional pre-pump or increase the height of the inlet tank.
7. Mechanical seal High reliability: Because there is no axial displacement of the rotor during startup and shutdown in the self-balancing multistage centrifugal pump, nor axial pulsation during operation, the problem of low reliability of the mechanical seal that has always affected multistage pumps has been overcome.
8. Easy maintenance: The self-balancing multistage centrifugal pump uses a three-dimensional design for the entire machine, with rotor components machined by numerical control, strictly ensuring the dimensions and machining accuracy of each component. This allows for quick assembly and disassembly of the pump, and the replacement of seals and bearings without disassembling the pump body or the inlet and outlet pipes. General technical personnel can complete the process by following the order and requirements of the assembly diagram, completely avoiding the need for specialized personnel to adjust and position the axial displacement, providing great convenience to the user.
9. Low maintenance rate: The self-balancing multistage centrifugal pump uses precise casting, reducing wear parts and the frequency of disassembly for maintenance, prolonging the product's lifespan and largely avoiding a series of problems caused by frequent disassemblies, reducing maintenance costs.
10. High adaptability: The self-balancing multistage centrifugal pump uses an advanced combined modular design, with local components that have been tested in intensive use and prolonged operation. The parts have high interchangeability, eliminating the small space balance disk device, and adapting to more severe medium conditions than traditional structured multistage pumps.
Self-balancing multistage pump Comparative cost chart between self-balancing multistage centrifugal pump and traditional multistage centrifugal pump.
Product parameters
Description of the self-balancing multistage centrifugal pump model resistant to wear MDP
Performance parameters of the self-balancing multistage centrifugal pump resistant to wear MDP （ These data are for reference only, please take the actual order as the standard!）
MD6-25P
MD6-50P
MD6-80P
MD12-25P
MD12-50P
MD12-80P
MD25-30P
MD25-50P
MD25-80P
MD46-30P
MD46-50P
MD46-80P
MD65-80P
MD85-45P
MD85-67P
MD85-80P
MD85-150P
MD100-55P
MD120-50P
MD120-67P
MD120-80P
MD120-100P
MD150-30P
MD150-50P
MD150-80P
MD150-100P
MD150-130P
MD155-30P
MD155-67P
MD200-50P
MD200-80P
MD200-100P
MD200-150P
MD280-43P
MD280-65P
MD280-95P
MD280-100P
MD300-45P
MD300-65P
MD360-40P
MD360-60P
MD360-95P
MD420-95P
MD450-40P
MD450-60P
MD450-95P
MD500-57P
MD550-40P
MD550-50P
MD550-95P
MD580-60P
MD580-100P
MD600-60P
MD600-85P
MD650-80P
MD650-100P
MD720-60P
MD720-80P
MD720-100P
MD800-80P
MD850-100P
MD900-60P
MD1100-85P
200MD43P
More Self-balancing multistage centrifugal pump resistant to wear MDP Performance parameters Please visit Water pump selection Page to download the intelligent selection software or call: 0731-88192288 for more information.
Why Choose Us?
Changsha Zhonglian Pump Industry Co., Ltd. was established in 1989, following the reform of the Changsha Water Pump Factory. It is a national high-tech comprehensive enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Stock Exchange on December 31, 2019, with the abbreviated name "Zhonglian Pump Industry" and stock code: 600275HN. It is currently a key enterprise in China's centrifugal pump industry and one of the leading domestic manufacturers of multi-stage pumps, headquartered in Changsha, Hunan, a historical and cultural city in China.
FAQ
Q
What products do you mainly produce?
A
Zoomlion Pump Industry manufactures various large industrial centrifugal pumps. The main products include: self-balancing multistage pumps, multistage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condenser pumps, and more.
Q
Can you help me choose a model?
A
Of course! If the water pump model is not selected accurately, it can cause significant problems. After you take it back, it might be either too small to meet the usage requirements or too large, resulting in higher electricity and fuel costs, increasing the operating expenses.
Q
Why is the price quotation so slow?
A
Because centrifugal pumps are non-standard custom products with many models and a wide price range. Even for the same model, the price varies greatly depending on the materials and configurations used. Taking the most common 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 clearly confirm the relevant information to provide you with an accurate price. Normally, if you provide comprehensive information, we can quote within 5 minutes.
Q
What information should I provide when I need a quote?
A
Usually, if you want to get an accurate quote, it is recommended that you provide us with the following information: pump flow rate, head, on-site operating voltage, frequency, temperature of the conveyed liquid, pH value, solid particle content, on-site installation conditions (horizontal or vertical installation), and other related details.
If you are not very familiar with these, it’s okay; our sales manager will assist you in determining them.
Q
Do you have centrifugal pumps in stock?
A
There are many models and configurations of centrifugal pumps. Except for a small number of commonly used standard models that are in stock, the vast majority of models and configurations are not stocked and are customized products. We need to first select the pump based on your site conditions such as flow rate, head, medium temperature, pH value, and installation conditions. After determining the pump model and configuration, we can then place an order with the workshop for production.
Q
What is your usual delivery time?
A
Models in stock can be shipped by the next day at the latest. Others are custom-made, and depending on the product size and specific project conditions, the delivery time is generally between 7-90 days. Please consult our sales manager for details: 0731-88632200 。
