What is the difference between the working principle of liquid viscous soft start and fluid coupling

Liquid viscous soft start and fluid coupling.

The difference in how it works:

1. Liquid viscous soft start:

Utilizes the viscosity of the liquid (i.e., oil film shear.

to transmit torque. The structure of the mechanical body is controlled by the main and driven shafts and the main and slave friction plates.

Spring, box and seal. When the driving shaft drives the active friction plate to rotate, the viscous fluid between the friction plates forms an oil film to drive the driven friction plate to rotate, and the oil film thickness between the main and driven friction plates is adjusted by adjusting the oil pressure in the oil cylinder, so as to change the output speed and torque of the driven shaft, and realize the controllable soft start and speed regulation function of mechanical equipment.

2. Hydraulic coupling:

If it is a shaft oil pump, when the main motor power supply is pulled off, because the inertia oil pump will rotate, if it is an electric oil pump, the main motor will cut off the power supply first, the working machinery and the coupling are still running due to inertia, at this time, the electric oil pump continues to work When these working machinery and couplings stop, turn off the electric oil pump solid-state soft starter.

By series resistance, the voltage and current of the motor are changed. It just works when it starts. It cannot be operated for a long time.

The working principle of the liquid viscous soft start device is to use the viscosity of the liquid (i.e., the oil film shear force) to transmit torque. The structure of the mechanical body is composed of the main and driven shafts, the main and driven friction plates, the control cylinders, springs, boxes and seals. When the driving shaft drives the active friction plate to rotate, the viscous fluid between the friction plates forms an oil film to drive the driven friction plate to rotate, and the oil film thickness between the main and driven friction plates is adjusted by adjusting the oil pressure in the oil cylinder, so as to change the output speed and torque of the driven shaft, and realize the controllable soft start and speed regulation function of mechanical equipment.

Speed-regulating Fluid Coupler:

If it is a shaft oil pump, when the main motor power supply is pulled off, because the inertia oil pump will rotate If it is an electric oil pump, the main motor will cut off the power supply first, and the working machinery and coupling are still running due to inertia, at this time, the electric oil pump continues to work When these working machines and couplings are stopped, turn off the electric oil pump solid-state soft starter: rely on the series resistance to change the voltage and current of the motor. It just works when it starts.

It cannot be operated for a long time.

There are 4 subjects in the entrance examination: English, Mathematics, Professional Foundation, and Professional Comprehensive Test.

English test big.

The syllabus refers to the requirements of the English examination for the admission of all returning engineering master's students.

The syllabus of the Mathematics test is based on the tutoring sessions we organize. (Note: The subject of the professional foundation examination is "Programming".)

C Language Programming" Tan Haoqiang.

Tsinghua University Press; Data Structures

C language version, Yan Weimin, Wu Weimin.

Tsinghua University Press; ）

The professional comprehensive test is conducted in the form of an interview, and the interview team is composed of experts from Beijing Institute of Technology, focusing on the candidate's English.

Listening and speaking ability and knowledge and ability to engage in the profession studied, potential quality, job experience and performance.

1. The entrance examination time is:

May 2011

Month; 2. The pre-test tutoring time is scheduled one week before the test.

7. Training and management.