Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    Self-balancing horizontal multistage centrifugal pump type DP
    Self-balancing horizontal multistage centrifugal pump type DP
    Self-balancing horizontal multistage centrifugal pump type DP
    Self-balancing horizontal multistage centrifugal pump type DP
    Self-balancing horizontal multistage centrifugal pump type DP
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    • Self-balancing horizontal multistage centrifugal pump type DP
    • Self-balancing horizontal multistage centrifugal pump type DP
    • Self-balancing horizontal multistage centrifugal pump type DP
    • Self-balancing horizontal multistage centrifugal pump type DP
    • Self-balancing horizontal multistage centrifugal pump type DP

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    Horizontal multistage centrifugal pump

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    Pump

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    Self-balancing horizontal multistage centrifugal pump type DP

    Lifting height: 70-1790m

    Price: 1.30-495,000

    Efficiency: 30%-80%

    Pump weight: 155-6260kg

    Cavitation margin: 2.0-7.0m

    Motor power: 5.5-4500kw

    Flow rate: 3.5-1345m³/h

     

    The DP type self-balancing multistage centrifugal pump is a basic product within the series of self-balancing horizontal multistage pumps, used to transport clean water without solid particles and with a temperature below 80°C or liquids with physical and chemical properties similar to clean water. It is widely used in mines, factories, urban water supply and drainage projects, fire water, and long-distance water transportation.

    +86 0731-88192288

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    Product description

    　As one of the most recognized domestic manufacturers of multistage centrifugal pumps, to actively respond to the national call for energy saving and adhere to the sustainable development path, our company, after studying and adopting advanced technologies from similar foreign products and combining years of pump design experience, has developed a series of high-efficiency and energy-saving self-balancing horizontal multistage pumps. This series of multistage pumps uses a state-recommended hydraulic model, developed according to API610 standard, with advantages such as high energy efficiency, wide performance range, reasonable structure, good cavitation resistance, safe and stable operation, low noise, few wear parts, and easy installation and maintenance, positioning it at the technological forefront of the industry.

     

    The self-balancing horizontal multistage pump innovates the traditional structure of the multistage centrifugal pump by eliminating the axial force balance device of common multistage pumps, and uses the mutual cancellation of forces from symmetrically arranged impeller rotor components to balance the axial force, effectively solving axial displacement. During operation, there is no efficiency loss caused by the friction of the balance disk or reflux, increasing efficiency by 3-12% compared to common multistage pumps of the same category. Additionally, it completely resolves failures such as wear or blockage of the balance disk and its seat due to balance device failures, significantly extending the pump's service life. After years of user operation, it has been proven that the series of self-balancing horizontal multistage pumps produced by our company has much higher reliability and efficiency than traditional D-type multistage pumps, with a failure-free operation time more than three times longer, effectively extending service life, which not only directly saves production costs for users but also considerably reduces operation and maintenance costs. The DP type self-balancing multistage centrifugal pump is a basic product within the series of self-balancing horizontal multistage pumps and is a good replacement for traditional D-type multistage pumps using balance disks or drums.

     

          Image 1   DP type self-balancing horizontal multistage pump Scope of application

     

    　　Suitable for transporting clean water without solid particles and liquids with physical and chemical properties similar to clean water at temperatures below 80℃, widely used in mining, factories, urban water supply and drainage projects, fire-fighting water, long-distance water transportation, among other fields.

     

          Image 1   Description of the DP type self-balancing horizontal multistage pump structure

     

    The DP type self-balancing horizontal multistage pump has support at both ends, the casing is segmented, and the pump transmission is connected to the motor via a cylindrical pin elastic coupling.

    Pump rotation direction: viewed from the drive end, the pump rotates clockwise.

     

    Anatomical diagram of the self-balancing multistage pump structure
     
     
     
     
           Image 1   DP type self-balancing horizontal multistage pump Principle and working process 
     
     
     

     

    1. Static part

    Mainly composed of the suction section (water inlet), middle section, discharge section (water outlet), guide vanes, secondary water inlet section, packing body (rear cover), and bearing body, all connected by tension bolts. From the coupling end, the pump inlet is oriented horizontally to the right and the outlet vertically upwards.

    2. Rotating part

    Mainly composed of shaft, impeller, shaft choke 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 Choke sealing is used between the pump stages.

    3.3 Shaft seals on both sides of the pump use soft packing.

    3.4 Water retaining rings are used to prevent water from entering the bearings.

    4. Bearing part

    The complete rotor of the self-balancing horizontal multistage pump is supported by a cylindrical roller bearing according to standard 《GB/T283-94》 at the drive end and an angular contact ball bearing according to standard 《GB/T292-94》 at the opposite end. The bearings use CD30 or CD40 mechanical oil, which is added to the bearing body up to the center of the oil sight glass for lubrication. Due to the use of the angular contact ball bearing according to 《GB/T292-94》, the assembled rotor does not exhibit axial displacement.

       

     

           Image 1   Top 10 advantages of the self-balancing horizontal multistage pump compared to the traditional multistage pump

     

    1. New structure: the self-balancing horizontal multistage pump has rotor components with symmetrically arranged impellers, causing the axial forces generated by the positive and negative impeller groups to cancel each other out, eliminating the balance disk device which has small clearances, high pressure drop, easy erosion, wear, and failures, overcoming the traditional structure of multistage pumps;

    2. New technology: the self-balancing horizontal multistage pump features unique choke devices, pressure reduction, and balance devices on odd stages, which also act as auxiliary supports;

    3. High energy efficiency: The self-balancing horizontal multistage pump uses an advanced hydraulic model, solving the wear and axial pulsations caused by the balance disk, always maintaining excellent centering between the impeller and guide vanes. During prolonged use, it prevents significant efficiency reduction caused by balance disk wear and rotor displacement in common multistage pumps, in addition to eliminating balance water leakage, reducing volumetric loss, generally improving the pump's operational efficiency, and reducing shaft power, with an average efficiency 3%-12% higher than common multistage pumps.

    4. High reliability: The self-balancing horizontal multistage pump uses a self-balancing system to basically cancel the axial force load generated during pump operation, minimizing rotor wear and system interference. The small residual axial force is supported by the thrust bearing, keeping the pump shaft always in tension, with a uniform force distribution and a significant reduction in the tension peak compared to the prototype structure, which improves the rotor's stiffness and critical speed, notably increasing the stability and reliability of the pump rotor's operation.

    5. High stability: The self-balancing horizontal multistage pump maintains high long-term operational stability and efficiency thanks to the excellent symmetrical combination of the impeller and guide vanes, along with a reasonable coupling clearance and a wide axial throttling design.

    6. Good cavitation performance: The self-balancing horizontal multistage pump uses an optimized hydraulic model and structural design, with a double suction structure in the first impeller stage, as well as precise casting and wear-resistant materials, which provide good cavitation performance, stable operation, and low noise, without the need to install a preliminary pump or raise the inlet tank height.

    7. High mechanical seal reliability: Because the rotor components of the self-balancing horizontal multistage pump do not exhibit axial displacement during start-up and shutdown, nor axial pulsations during operation, the problem of low mechanical seal reliability that has traditionally affected multistage pumps has been resolved.

    8. Easy maintenance: The self-balancing horizontal multistage pump is designed in 3D, with rotor components machined by numerical control, strictly ensuring the dimensions and precision of each part, allowing quick assembly and disassembly. Additionally, seals and bearings can be replaced without dismantling the pump body or the inlet and outlet pipes. General technical personnel can complete the process by following the assembly diagram's order and requirements, completely avoiding the need for specialized technicians to adjust and position axial displacement, offering great convenience to the user.

    9. Low maintenance rate: The self-balancing horizontal multistage pump uses precise casting, reducing wear parts and the frequency of disassembly and repair, extending the product's service life and largely avoiding problems caused by frequent disassemblies, which reduces maintenance costs.

    10. High adaptability: The self-balancing horizontal multistage pump adopts an advanced combined modular design, with locally tested components in prolonged use that have high interchangeability. The small space balance disk device is eliminated, making this pump more suitable for media with more severe properties than traditional multistage pumps.

          

     

          Image 1   Comparative cost chart between self-balancing horizontal multistage pump and traditional multistage pump

    Cost analysis of the self-balancing multistage pump and the traditional multistage pump

    Product parameters

    Description of the self-balancing horizontal multistage centrifugal pump model type DP

     

     

     

     

    Performance parameters of the self-balancing multistage pump type DP (these data are for reference only, please take the actual order as the standard)

     

    D6-25P

    D6-50P

    D6-80P

    D12-25P

    D12-50P

    D12-80P

    D25-30P

    D25-50P

    D25-80P

    D46-30P

    D46-50P

    D46-80P

    D65-80P

    D85-45P

    D85-67P

    D85-80P

    D85-150P

    D100-55P

    D120-50P

    D120-67P

    D120-80P

    D120-100P

    D150-30P

    D150-50P

    D150-80P

    D150-100P

    D150-130P

    D155-30P

    D155-67P

    D200-50P

    D200-80P

    D200-100P

    D200-150P

    D280-43P

    D280-65P

    D280-95P

    D280-100P

    D300-45P

    D300-65P

    D360-40P

    D360-60P

    D360-95P

    D420-95P

    D450-40P

    D450-60P

    D450-95P

    D500-57P

    D550-40P

    D550-50P

    D550-95P

    D580-60P

    D580-100P

    D600-60P

    D600-85P

    D650-80P

    D650-100P

    D720-60P

    D720-80P

    D720-100P

    D800-80P

    D850-100P

    D900-60P

    D1100-85P

    200D43P

    		 

    For more performance parameters of the self-balancing multistage centrifugal pump type DP, please download the intelligent selection software on the pump selection page or call: 0731-88192288 for more information.

    Changsha Zhonglian Pump Industry Co., Ltd.

    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.

    Changsha Zhonglian Pump Industry Co., Ltd.
    Changsha Zhonglian Pump Industry Co., Ltd.

    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 。

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