Product Description
Densen Customized hydraulic coupling,hydraulic drive coupling,flexible couplings for conveyor
| Product Name | Fluid coupling,constant fluid coupling,fluid coupling yox |
| DN mm | 16~190mm |
| Rated Torque | 40~25000 N·m |
| Allowable speed | 4500~200 kN·m |
| Material | 45#steel |
| Application | Widely used in metallurgy, mining, engineering and other fields. |
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Application Case
Typical case of diaphragm coupling applied to variable frequency speed control equipment
JMB type coupling is applied to HangZhou Oilfield Thermal Power Plant
According to the requirements of HangZhou Electric Power Corporation, HangZhou Oilfield Thermal Power Plant should dynamically adjust the power generation according to the load of the power grid and market demand, and carry out the transformation of the frequency converter and the suction fan. The motor was originally a 1600KW, 730RPM non-frequency variable speed motor matched by HangZhou Motor Factory. The speed control mode after changing the frequency is manual control. Press the button speed to increase 10RPM or drop 10RPM. The coupling is still the original elastic decoupling coupling, and the elastic de-coupling coupling after frequency conversion is frequently damaged, which directly affects the normal power generation.
It is found through analysis that in the process of frequency conversion speed regulation, the pin of the coupling can not bear the inertia of the speed regulation process (the diameter of the fan impeller is 3.3 meters) and is cut off, which has great damage to the motor and the fan.
Later, they switched to the JMB460 double-diaphragm wheel-type coupling of our factory (patent number: ZL.99246247.9). After 1 hour of destructive experiment and more than 1 year of operation test, the equipment is running very well, and there is no Replace the diaphragm. 12 units have been rebuilt and the operation is in good condition.
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What are the different fluid media used in fluid drive couplings, such as oil or water?
Fluid drive couplings can use various types of hydraulic fluids as the medium to transmit torque between the driving and driven elements. The choice of fluid media depends on the specific application requirements and the operating conditions. Some common fluid media used in fluid drive couplings include:
- Oil: Mineral oil, synthetic oil, or a blend of various oils are commonly used as hydraulic fluids in fluid drive couplings. These oils offer good lubrication properties and thermal stability, making them suitable for various industrial applications. Oil-based fluid drive couplings are often preferred for heavy-duty and high-temperature applications.
- Water-Glycol: Water-glycol mixtures are widely used as hydraulic fluids in fluid drive couplings that require fire-resistant properties. These fluids are commonly used in industries where fire hazards are a concern, such as steel mills and foundries.
- Water-Oil Emulsions: Emulsions of water and oil are used in certain fluid drive couplings, especially in applications where fire resistance and cooling properties are essential. Water-oil emulsions provide both good lubrication and effective heat dissipation capabilities.
- Water: In some specific applications, plain water is used as the hydraulic fluid in fluid drive couplings. Water offers excellent cooling properties and is suitable for applications where there is no risk of freezing or where fire resistance is not a primary concern.
- Biodegradable Fluids: Biodegradable hydraulic fluids, such as vegetable-based oils or synthetic esters, are employed in environmentally sensitive applications. These fluids are biodegradable and offer good lubrication properties while minimizing environmental impact.
- Specialty Fluids: Depending on the specific requirements of niche applications, other specialty hydraulic fluids with unique properties may be used in fluid drive couplings. These specialty fluids are tailored to meet specific demands, such as extreme temperatures or aggressive operating environments.
The selection of the appropriate hydraulic fluid for a fluid drive coupling depends on factors like the operating temperature, load conditions, environmental considerations, and compatibility with the coupling’s materials. Manufacturers usually provide guidelines on the suitable fluid types and specifications for their specific fluid drive coupling models.
Regular monitoring and maintenance of the hydraulic fluid are essential to ensure optimal performance and to extend the service life of the fluid drive coupling. Fluid condition monitoring helps identify any signs of contamination or degradation, enabling timely fluid replacement or treatment as necessary.
It is crucial to follow the manufacturer’s recommendations regarding fluid type, fluid level, and fluid change intervals to ensure the fluid drive coupling operates efficiently and reliably in its intended application.
Real-World Examples of Successful Fluid Drive Coupling Installations and Their Benefits
Fluid drive couplings, also known as hydraulic couplings or fluid couplings, have been widely used in various industrial applications to achieve numerous benefits. Here are some real-world examples of successful fluid drive coupling installations and the advantages they offer:
- Mining Industry:
In large mining operations, fluid drive couplings are commonly used in conveyor belt systems to control the starting and stopping of the belts. The fluid coupling provides smooth and gradual acceleration, reducing shock loads on the conveyor system and minimizing wear and tear on the belts and other components. This results in increased equipment lifespan and reduced maintenance costs. Additionally, the fluid coupling offers overload protection, preventing damage to the conveyor system in case of sudden overloads or blockages.
- Steel Industry:
In steel mills, fluid drive couplings are utilized in various applications, such as rolling mills and large fans. In rolling mills, fluid couplings help maintain a constant speed during rolling operations, ensuring consistent product quality. The fluid coupling’s ability to absorb shock loads and torsional vibrations protects the rolling mill equipment and reduces downtime. In cooling and ventilation fans, fluid couplings provide soft starts and smooth speed control, leading to energy savings and quieter operation.
- Power Generation:
In power plants, fluid drive couplings are commonly used in steam turbines and gas turbines. Fluid couplings allow for controlled acceleration of the turbines, reducing the mechanical stress on the blades and rotor during startup. This results in extended turbine life and improved reliability. Additionally, fluid couplings help improve grid stability by enabling gradual synchronization with the power grid during startup.
- Marine Industry:
In marine propulsion systems, fluid drive couplings are employed to connect diesel engines to propellers. The fluid coupling ensures smooth torque transmission and absorbs torsional vibrations, preventing damage to the propulsion system and increasing the lifespan of the engine and gearbox. Additionally, the fluid coupling offers overload protection, safeguarding the engine and drivetrain from sudden load changes.
- Pumping Applications:
In water and wastewater treatment plants, fluid drive couplings are commonly used in pump applications. The fluid coupling enables soft starts, reducing the impact on the pump and electrical system during startup. This results in energy savings and extended pump life. Additionally, the fluid coupling’s ability to dampen torsional vibrations minimizes wear on pump bearings and mechanical seals.
These real-world examples illustrate the versatility and effectiveness of fluid drive couplings in various industries. Whether in mining, steel production, power generation, marine propulsion, or pumping applications, fluid couplings provide reliable and efficient power transmission while offering benefits such as reduced maintenance, energy savings, increased equipment lifespan, and improved system reliability.
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How do fluid drive couplings accommodate misalignment and protect against overload during operation?
Fluid drive couplings are designed to accommodate misalignment between the driving and driven shafts, as well as provide protection against overload conditions during operation. The key mechanisms that enable these features are as follows:
- Misalignment Accommodation: Fluid drive couplings utilize a hydrodynamic principle to transfer power between the driving and driven shafts. The hydraulic fluid within the coupling creates a fluid film that separates the impellers (pump and turbine) of the coupling. This fluid film allows the impellers to rotate independently of each other and provides some level of misalignment accommodation. As a result, the fluid drive coupling can tolerate small amounts of axial and angular misalignment between the shafts without causing excessive wear or damage.
- Slip Mechanism: In fluid drive couplings, the impellers are designed to slip relative to each other under certain conditions. During start-up or when the driven shaft encounters a sudden overload, the fluid drive coupling allows a controlled amount of slip between the impellers. This slip absorbs the excess energy and prevents shock loads from transmitting to the machinery. The slip mechanism acts as a protective feature, preventing damage to the coupling and the connected components in the power transmission system.
- Overload Protection: The slip mechanism in fluid drive couplings also serves as an overload protection mechanism. If the load on the driven shaft exceeds the coupling’s capacity, the impellers will slip to prevent the driving shaft from stalling and absorbing the excessive load. This overload protection prevents damage to the power transmission system, providing a safety measure against sudden and unexpected overloads.
- Gradual Torque Transmission: Fluid drive couplings offer gradual torque transmission, especially during start-up. As the driving shaft accelerates, the hydraulic fluid transfers torque to the driven shaft smoothly. This gradual engagement helps reduce shock loads on the system, protecting the machinery from excessive stresses and ensuring a longer operational life.
By incorporating these design features, fluid drive couplings enhance the reliability, efficiency, and safety of power transmission systems. The ability to accommodate misalignment and provide overload protection makes fluid drive couplings suitable for various applications, where mechanical flexibility and safety are essential requirements.
However, it’s important to note that while fluid drive couplings offer misalignment accommodation and overload protection to a certain extent, excessive misalignment or continuous overload conditions can still lead to premature wear and reduce the coupling’s overall performance. Regular maintenance and monitoring of the fluid drive coupling’s condition are necessary to ensure it continues to operate optimally and contributes to the efficient functioning of the power transmission system.
editor by CX 2023-09-21
