Mixing technology -- Analysis and introduction of mixer selection steps

The design and selection of mixing device are closely combined with the purpose of mixing operation Various mixing processes need to be realized by different mixing devices In the design and selection, the mixer type, motor power and mixing speed shall be determined first according to the purpose and requirements of the process for mixing operation, and then the reducer, frame, mixing shaft, shaft seal and other components shall be selected The specific steps and methods are as follows: 1 According to the process conditions, mixing purpose and requirements, select the type of agitator When selecting the type of agitator, fully grasp the dynamic characteristics of the agitator and the causal relationship between the flow state produced by the agitator during the mixing process and various mixing purposes; 2 According to the determined type of agitator and agitator The flow state produced in the mixing process, the control requirements for mixing time, settling speed and dispersion of the process, and the motor power, mixing speed and agitator diameter are determined through experimental means and computer simulation design 3 According to the motor power, mixing speed and process conditions, select and determine the reducer model from the reducer selection table If the reducer is selected according to the actual working torque, the actual working torque shall be less than the allowable torque of the reducer 4 Select the frame and coupling with the same model and specification as d according to the output shaft head D of the reducer and the support mode of the mixing shaft system 5 Select the shaft seal type according to the do size of the mixing shaft head of the frame, the installation space, the working pressure and the working temperature 6 Design and select the structure type of the mixing shaft according to the installation form and structural requirements, and check its strength and rigidity For example, if the design is based on rigid shaft, N / NK ≤ 0.7 if the design is based on flexible shaft, N / NK > = 1.3 7 if the design is based on the strength, according to the nominal size DN of the frame, the type and pressure grade of the mixing shaft, choose to install the bottom cover, flange base or flange flange 8 Determine whether to configure auxiliary support according to the support and anti vibration conditions In the above selection process, the combination and configuration of the mixing device can be referred to (schematic diagram of the mixing device design and selection process) The key size of the connection between the components in the configuration process is the size of the shaft head In principle, the components with the same size of the shaft head can be interchanged and combined.