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Hydrodynamic Couplings

Reliability and Excellent Performance

Presentation

HENFEL has been present with its Hydrodynamic Couplings in the main industries of Brazil and other countries of this world. Through participation in major projects of implementation and expansion of industrial facilities, and technical support provided by our mechanical engineers and technical representatives, we prime for close service, focused on the needs of its clients, from the concept of the project until the application.




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INTRODUCTION

Henfluid hydrodynamic couplings have been developed and designed by employing the most up-to-date engineering concepts resulting in a product of the highest technical standard and excellent operating performance. Carefully dimensioned models were elaborated for projects with power requirements from 02 to 2500 HP.

Advantages

Henfluid hydrodynamic couplings have been developed and designed by employing the most up-to-date engineering concepts resulting in a product of the highest technical standard and excellent operating performance. Carefully dimensioned models were elaborated for projects with power requirements from 02 to 2500 HP.

Advantages arising from use of Henfluid hydrodynamic couplings

As a consequence of the advantages above, Henfluid hydrodynamic couplings offer a vast range of applications in industrial equipments applied in sectors such as mining, siderurgy, pulp and paper, sugar and alcohol, among others.

HOW IT WORKS

The main components are two axially winged wheels, one being the pump wheel and the other one the turbine wheel, in addition to a shell which works as a fluid reservoir and houses the secondary wheel.

Funcionamento
Technical Information

The wheels are set facing each other with a pre-determined clearance, with no mechanical contact between them.

The Henfluid hydrodynamic coupling works like a centrifugal pump and a hydraulic turbine. By means of an input force (conventional electric motor or electric ring motor), the kinetic energy is transmitted by the fluid fill inside the coupling. The fluid is accelerated by the pump wheel connected to the input shaft, and through centrifugal force, the power is transmitted to the turbine wheel connected to the output shaft. Therefore, the torque generated is transmitted to the driven machine. Any of the wheels can assume the task of pump or turbine depending on the assembly arrangement. Wear is practically inexistent as there is no mechanical contact, and the efficiency of the system is only dependent on the difference between the input and output rotation of the coupling (nominal slip).

IDLE POSITION
repouso

The operating fluid remains static inside the coupling..

START UP
partida

The driving machine provides the energy to accelerate the operating fluid to generate a circulatory flow. Due to the transmission of the kinetic energy by the fluid, the turbine wheel is put in motion.

OPERATION
regime

The driving machine provides the energy to accelerate the operating fluid to generate a circulatory flow. Due to the transmission of the kinetic energy by the fluid, the turbine wheel is put in motion.

Selection

The preliminary selection of models and sizes of HENFLUID coupling hydrodynamic can be made through the selection chart, available in the technical catalogue. Our engineering department applications and technical sales is at your disposal to resolve any questions and assist you throughout this process.

All preliminary selection will be subject to change or confirmation of receipt of information questionnaire and technical data with information on the engine, driven equipment, functions provided for coupling, axle dimensions and mounting layout completed.

COUPLINGS HYDRODYNAMIC WITH AS WATER DRIVE THROUGH

Preservation of the environment is one of HENFEL’s priorities.

Therefore, each of the products developed by the company undergo studies which aim to minimize their impacts in the environment.

Hence, a complete line of Hydrodynamic Couplings that uses water as operating medium in substitution of mineral oil was developed. It completely eliminates the possibility of contaminations of the environment .

acoplamento hidrodinâmico aplicação
Advantages of water as an operating medium

Important remark

Although dimensionally identical, water cannot be used as operating medium of oil couplings due to differences regarding internal components and material treatments.

Selection

It should be noted the power variation for this Henfluid water model when these couplings are selected, the power is increased by 10% for the appropriate model coupling to the water application. For example, if the motor is to be used 200cv, it uses the value of 220cv.

Specification

Henfluid Water Couplings are available from size 30 and above.

Regarding the coupling’s reference, the letter A must be added after the letter H, for all models. E.g. HLE becomes HALE, HFF becomes HAFF, HCP becomes HACP, and so on. You can check all available constructive forms from pages 8 to 18.

Water specification
Important recomendations

CHARACTETRISTICS

Power transmission is the result of the fluid circuit type and the volume of the operating medium inside the chamber of HENFLUID hydrodynamic couplings; these features determine consumption of electricity during start-up, minimum starting torque, torque evolution during acceleration of the driven machine and torque transmitted under normal operating conditions..

gráfico de características

M/M Nom Aluminum (Silicon)

M Ac Aluminum (Silicon)

M Mt Aluminum (Silicon)

M C Aluminum (Silicon)

M Nom Aluminum (Silicon)

Without delay chamber
Delay chamber type R
Delay chamber type RR
Delay chamber type RRA
HENFLUID coupling type H-...

This is the basic assembly of Henfluid couplings without retarding chamber, used for large start-up cycles and with limitation of maximum start-up torque by up to 180% of nominal torque, and low inertia. It is recommended for protecting the system from vibrations and overloads

acoplamento h
HENFLUID coupling type H--...R e H-...RR

Configuration H…-R is with simple retarding chamber used for large inertia systems which require limitation of the maximum start-up torque of up to 160% of nominal torque. Configuration H…-RR is with elongated retarding chamber used for large inertia systems which require limitation of maximum start-up torque by up to 140% of nominal torque.

As shown on the graph above, the resulting positive acceleration torque is sufficient for the electric motor to quickly reach its asynchronous rotation and thus present ideal conditions to help accelerating the driven machine. Henfluid hydrodynamic couplings also provide fluid flow control between the retarding chamber – simple or elongated – and the operating chamber by means of calibrated fluid flow mechanisms, allowing many combinations of fluid outflow x acceleration time x torque limitation, optimizing the start-up conditions for all drive types.

They are used for belt conveyors, chain conveyors, centrifuges, mills, machines with great inertia, etc..

acoplamento hr
H...R
acoplamento hrr
H...RR
HENFLUID coupling type H-...RRA

This type features an elongated retarding chamber and auxiliary start-up chamber. When using type “A” auxiliary start-up chambers, it is possible to remove at the moment of start-up a significant quantity of fluid initially contained in the operating chamber of the hydrodynamic coupling, facilitating acceleration of the motor, thus providing to the system start-up torque limitation of between 95% and 120% of the electric motor’s nominal torque.

Upon conclusion of acceleration of the electric motor, the “RR” elongated retarding chamber restores to the operating chamber the fluid volume previously removed on start-up by the auxiliary chamber “A”, re-establishing operating conditions of the hydrodynamic coupling.

The fluid outflow rate from the operating chamber to the auxiliary start-up chamber at the beginning of acceleration of the electric motor is many times higher than the outflow provided by the passage valves; these can be regulated through the combination of graduated apertures, in accordance with the start-up conditions of each particular equipment..

The main function of the auxiliary start-up chamber “A” is to provide maximum start-up torque relief for the drive systems that use medium and high tension short circuit motors and cage rotors, permitting that these motors accelerate without load. Special attention should be given to the category N simple cage rotor electric motors which show high performance in asynchronous rotation with low initial start-up torque.

Type HLE-RRA Henfluid hydrodynamic couplings are recommended for large inertia drive systems, especially inclined or not inclined long distance belt conveyors, with simple or multiple drive, where the effects of transient tensions of the belts are to be eliminated; these tensions occur during the so-called transition period, i.e. from the belt’s stationary position at start-up to the complete acceleration of the system. It is observed in practice that a conveyor belt is not a rigid system or a constant torque machine, in view of the known profiles of speed variation during its acceleration.

These variations are originated by the generation of shock waves stemming from the natural speed difference between the top and bottom end of the conveyor which work at deferred operating speeds due to the belt flexibility.

The frequency and magnitude of the shock waves depends on the ta/tu ratio, where ta is the torque variation transferred by the drive during the acceleration period, and tu is the oscillation time of low belt speeds (see figure below). Considering that tu cannot be changed because it depends on the belt type and length, the frequency and intensity of the shock waves is directly related to ta, i.e. evolution time of acceleration torque of the system. Therefore, the longer the time of start-up torque increase, the lower the effect of the shock waves on the system..

acoplamento hrra
H...RRA
gráfico hrra
Acceleration time in seconds
X

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