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Work two pump wheel and turbine fluid coupling cavity called a double-lumen constant filling fluid coupling.
A double-lumen constant filling fluid coupling structure and its characteristics
hydraulic manifolds(1) the structure of the overall structure of the double-lumen constant filling fluid coupling the wheel by two pumps and two turbines, the middle of the two pump wheel has an intermediate connection body, the inner edge of the pump wheel and turbine auxiliary chamber before two single chamber between the flow holes. The small size double-lumen coupling, does not have the intermediate connection member, each of the two pump wheel outwardly some housing to form a space to accommodate two turbine.
(2) the impeller structure dual-chamber hydraulic coupling impeller structure, there are three:
hydraulic adaptors1) impeller structure with single-cavity coupling identical. Equal to the pump wheel and the turbine of the coupling of two single lumen through the intermediate connecting member and the spindle are connected together.
2) the structure of the impeller wit h single-cavity coupling. Usually cascade depth equal to the a 0.09D shallow cavity, the impeller the middle of a baffle ring 3) stamping welding impeller structure. Cascade is approximately equal to an average depth of 0.08D, and shallow outer deep within, which is conducive to reducing the loss of liquid flow contraction. Impeller with the inner ring in the dual-chamber fluid couplings, but the inner ring shallow characteristics. Plus the inner ring may be in order to increase the contact between each of the blades and blade strength and stiffness.
(3) double-lumen constant filling fluid coupling characteristics.
1) the pump wheel torque coefficient due to the different structure of the impeller, the double-lumen constant filling fluid coupling of the pump wheel torque coefficient are not the same.
Impeller structure is the same as the single-chamber, dual-chamber pump wheel torque coupling coefficient is approximately equal to the single-c hamber times the power transfer is also approximately equal to 1 times the single-chamber.
Impeller structure of a shallow cavity, the pump wheel torque coefficient is not equal to 1 times the single-chamber, but about equal to the conventional single-cavity fluid coupling of 1.4 to 1.6 times. The power transfer is approximately equal to 1.5 times of the conventional single-cavity fluid coupling.
hydraulic ferrule2) overload coefficient from the cavity structure, the dual-chamber constant filling fluid coupling equivalent with front auxiliary chamber constant filling fluid couplings, which have characteristics generally contrast, and thus a higher coefficient of overload, especially zero speed overload factor will be higher. The shallow cavity type of dual chamber hydraulic coupling cavity depth, a low torque coefficient, combined flow blocking tape is disposed, and thus the overload coefficient can be us ed with single-chamber hydraulic coupling, and Tg = 2.5 to 4.
3) fluctuations than overloading the working fluid within the fluid coupling for the crowd ring movement, and by the dynamic pressure burst into the auxiliary chamber before transmitting torque decreased, but after that, no after the auxiliary chamber, so the torque again increased, and thus relatively large fluctuations.
4) the axial force. Often fluid-filled can automatically balance the axial force; dual-chamber coupling outside the fuel supply system, oil pressure and oil line toward different reasons and therefore can not completely eliminate the axial force, but you can greatly reduce the axial force.
5) Transmission characteristics. Based on experience, the dual-chamber constant filling fluid coupling should not be vertical with a vertical with a power transfer is significantly reduced, for example, YOXD360 coupling horizontal use pass the 45KW (input speed 1500r/min), but t he vertical use but can not pass 45KW, even 37KW also passed not. The reason for this phenomenon may be affected by gravity, dual-chamber coupling two uneven filled cavity above the cavity due to the fluid-filled to reduce, so pass power reduction, following cavity fluid-filled too much, but has reached the capacity limit, so the overall pass power down. Inner wheel drive double-lumen constant filling fluid coupling can also be outer wheel drive characteristics had no significant effect.
