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

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    Diaphragm coupling

    Zhonglian Pump Industry diaphragm coupling manufacturer professionally offers rigid diaphragm couplings, elastic diaphragm couplings, and other diaphragm couplings, with model images, parameters and specifications, standard installation dimension tables, model selection with reasonable quotation, price starting from 150 yuan per piece, wholesale and customized supply of complete sets

    +86 0731-88192288

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    info@cipump.com

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    Product Description Product Specifications Why Choose Us? FAQ

    Overview of diaphragm coupling:

     

     

    　　The diaphragm coupling uses thin elastic plates, which are connected to the two halves of the coupling by bolts or other joining methods to achieve an elastic connection between two shafts. In centrifugal pumps, diaphragm coupling is frequently used to connect the pump to the motor. The diaphragm coupling is composed of at least one diaphragm and two sleeves. The diaphragm is fixed to the sleeve with pins, which generally prevents loosening or bouncing between the diaphragm and the sleeve. Some manufacturers offer couplings with two diaphragms, and others with three, with one or two rigid elements in the middle, connected to the sleeves at both ends. The difference between single and double diaphragm couplings lies in their ability to handle various misalignments; since the diaphragm must be able to bend complexly, the single coupling is not suitable for eccentricities, while the double can bend in different directions to compensate for eccentricity. 
     

     

    Structure of the diaphragm coupling:

     

    　　The diaphragm coupling is composed of at least one diaphragm and two sleeves. The diaphragm is fixed to the sleeve with pins, which generally prevents loosening or bouncing between the diaphragm and the sleeve. Some manufacturers offer couplings with two diaphragms, and others with three, with one or two rigid elements in the middle, connected to the sleeves at both ends.

     

    Characteristics of the diaphragm coupling:

     

    　　This characteristic of the diaphragm coupling is similar to that of the bellows coupling; in fact, the way the coupling transmits torque is quite similar. The diaphragm is very thin, so when a relative displacement load is generated, it bends easily, being able to withstand deviations of up to 1.5 degrees, while in servo systems it generates a low load on the bearings. The diaphragm coupling is commonly used in servo systems, as the diaphragm has good torsional rigidity, although slightly lower than the bellows coupling. On the other hand, the diaphragm coupling is very delicate and can be easily damaged if used incorrectly or not installed properly. Therefore, it is very necessary to ensure that deviations are within the tolerable range for the normal operation of the coupling. Choosing the right coupling is a key step for its proper use, and the type of coupling to select should be considered during the design phase.

     

    Correct selection of the diaphragm coupling:

     

    　　1. The diaphragm coupling is composed of at least one diaphragm and two sleeves. The diaphragm is fixed to the sleeve with pins, which generally prevents loosening or bouncing between the diaphragm and the sleeve. Some manufacturers offer couplings with two diaphragms, and others with three, with one or two rigid elements in the middle, connected to the sleeves at both ends.

    　　2. This characteristic of the diaphragm coupling is similar to that of the bellows coupling; in fact, the way the coupling transmits torque is quite similar. The diaphragm is very thin, so when a relative displacement load is generated, it bends easily, being able to withstand deviations of up to 1.5 degrees, while in servo systems it generates a low load on the bearings.

    　　3. The diaphragm coupling is commonly used in servo systems, as the diaphragm has good torsional rigidity, although slightly lower than the bellows coupling.

    　　4. On the other hand, the diaphragm coupling is very delicate and can be easily damaged if used incorrectly or not installed properly. Therefore, it is very necessary to ensure that deviations are within the tolerable range for the normal operation of the coupling.

    　　5. Model adjustment according to shaft diameter:

    　　The preliminary dimensions of the selected bearing coupling, that is, the shaft hole diameter d and the hole length L, must meet the requirements of the driving and driven shaft diameters; otherwise, the coupling specification must be adjusted according to the shaft diameter d.

    　　It is common for the diameters of the driving and driven shafts to be different. When torque and speed are equal, and the diameters of the driving and driven shafts are different, the coupling model should be selected according to the larger shaft diameter. In newly designed transmission systems, the seven types of shaft holes specified in the GBT3852 standard should be chosen, recommending the J1 hole type to improve universality and interchangeability. The hole length must comply with the product standard of the bearing coupling i.

     

    Applications of the diaphragm coupling:

     

    　　It is widely used in the transmission of shafts of various mechanical devices, such as pumps (especially high-power pumps and chemical pumps), fans, compressors, hydraulic machinery, petroleum machinery, printing machinery, textile machinery, chemical machinery, mining machinery, metallurgical machinery, aviation (helicopters), high-speed power transmission systems for ships, steam turbines, piston power machinery transmission systems, tracked vehicles, as well as high-speed and high-power machinery transmission systems for generators. Its use in high-speed transmission shafts after dynamic balancing is quite common.

    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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