Product Description

Densen customized fluid coupling,constant fluid coupling,fluid coupling yox

 

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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Equipment

 

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 Differences between Fluid Couplings and Mechanical Clutches?

Fluid couplings and mechanical clutches are both components used in power transmission systems, but they operate on different principles and have distinct characteristics:

1. Operating Principle:
   • Fluid Coupling: A fluid coupling uses hydraulic fluid to transmit torque. It consists of an impeller and a runner immersed in a fluid-filled chamber. When the input shaft (driving member) rotates, it imparts motion to the fluid, which in turn drives the output shaft (driven member).
   • Mechanical Clutch: A mechanical clutch relies on physical contact between friction surfaces to transmit torque. When engaged, the clutch plates or discs press against each other, creating a mechanical link between the input and output shafts.
2. Slippage:
   • Fluid Coupling: Fluid couplings allow a certain degree of slippage between the input and output shafts. This slippage provides a smooth start and helps protect the machinery from shock loads.
   • Mechanical Clutch: Mechanical clutches have minimal slippage when engaged, providing a direct and rigid connection between the input and output shafts.
3. Control:
   • Fluid Coupling: Fluid couplings provide automatic torque transmission without the need for manual engagement or disengagement.
   • Mechanical Clutch: Mechanical clutches require manual actuation to engage or disengage, allowing for precise control over power transmission.
4. Heat Dissipation:
   • Fluid Coupling: Fluid couplings dissipate heat generated during operation, which helps prevent overheating of the system.
   • Mechanical Clutch: Mechanical clutches may generate more heat due to friction, requiring additional cooling mechanisms in high-power applications.
5. Applications:
   • Fluid Coupling: Fluid couplings are commonly used in heavy machinery, such as mining equipment, crushers, and conveyors, where shock absorption and smooth starts are crucial.
   • Mechanical Clutch: Mechanical clutches are prevalent in applications where precise engagement and disengagement are required, such as automotive transmissions and manual industrial machinery.

While both fluid couplings and mechanical clutches serve the purpose of transmitting torque, their different operating principles and features make them suitable for specific applications and operating conditions.

Role of Fluid Coupling in Torque Multiplication and Power Transfer

A fluid coupling is a mechanical device used to transmit power between two shafts without direct physical contact. It operates on the principles of fluid dynamics and hydrokinetics to enable torque multiplication and efficient power transfer. Here’s how a fluid coupling achieves these functions:

• Hydrodynamic Torque Converter: A fluid coupling is essentially a hydrodynamic torque converter. When the input shaft (driving shaft) rotates, it sets the transmission fluid inside the coupling in motion. The fluid experiences centrifugal forces, creating a high-velocity zone near the outer circumference and a low-velocity zone near the center. This velocity difference generates torque in the fluid coupling, allowing power to be transmitted from the input shaft to the output shaft (driven shaft).
• Torque Multiplication: One of the primary advantages of a fluid coupling is its ability to provide torque multiplication. During startup or when the load on the driven shaft is initially low, the fluid coupling slips to some extent, which allows the input shaft to rotate at a higher speed than the output shaft. This speed difference results in torque multiplication, enabling the fluid coupling to handle higher loads during acceleration or heavy starting conditions.
• Power Transfer Efficiency: Fluid couplings offer high power transfer efficiency due to the hydrodynamic nature of their operation. The smooth and continuous transmission of power through the fluid medium minimizes energy losses and mechanical wear, leading to more efficient power transmission compared to mechanical clutches or direct-coupling methods.
• Load Adaptability: Fluid couplings automatically adjust their slip to adapt to changing load conditions. When the load on the output shaft increases, the fluid coupling slips more, allowing the output shaft to slow down slightly and match the load demand. This load adaptability ensures smooth and stable power transfer even under varying operating conditions.

Fluid couplings are commonly used in applications where torque multiplication and smooth power transfer are essential. They find widespread use in heavy machinery, mining equipment, conveyors, crushers, marine propulsion systems, and many other industrial applications. By efficiently transferring power while providing torque multiplication, fluid couplings help optimize the performance and longevity of power transmission systems.

Proper selection of the fluid coupling based on the application’s torque and power requirements is crucial to ensure optimal torque multiplication and power transfer. Additionally, regular maintenance and monitoring of the fluid coupling’s condition are essential to maintain its efficiency and reliability over time.

Applications of Fluid Couplings in Industrial Machinery

Fluid couplings are widely used in various industrial machinery and equipment due to their unique characteristics and benefits. Some common applications include:

• Conveyors: Fluid couplings are used in conveyor systems to provide smooth start-ups and overload protection. They help in preventing damage to the conveyor belts and equipment during sudden starts and stops.
• Pumps: Fluid couplings are employed in pumps to control the acceleration and deceleration of the pump impeller. This ensures a gradual and controlled flow of fluids, reducing water hammer and pressure surges.
• Fans: Industrial fans often use fluid couplings to regulate fan speed and avoid abrupt changes in airflow, which can cause mechanical stress and system instability.
• Mining Equipment: Fluid couplings are used in mining machinery, such as crushers and conveyors, to protect the drivetrain from shock loads and to enhance equipment reliability.
• Marine Propulsion Systems: In marine applications, fluid couplings are used in propulsion systems to provide smooth engagement of the propeller, protecting the engine and transmission.
• Power Plants: Fluid couplings are utilized in power plants for boiler feed pumps, induced draft fans, and other equipment to achieve smooth operation and prevent sudden stress on mechanical components.
• Steel Industry: In steel mills, fluid couplings are employed in various equipment, including rolling mills and continuous casting machines, to protect the machinery and enhance productivity.
• Automotive: Fluid couplings are used in automatic transmissions to smoothly transmit power from the engine to the wheels, allowing smooth gear changes and preventing driveline shock.
• Wood Processing: In wood processing equipment, such as chippers and saws, fluid couplings are used to protect the equipment from shock loads and to achieve efficient power transmission.

Overall, fluid couplings play a crucial role in a wide range of industrial machinery applications, providing enhanced protection, smoother operation, and increased equipment longevity.

editor by CX 2024-04-29