In the vacuum measurement system, the single-chip module transmits the basic measurement signals (the thermocouple potential of the thermocouple and the ion current of the ionization tube) to the PC via RS485, and the PC performs digital filtering and nonlinear correction. Pressure calculation, data table and graphic display, parameter storage, printing and other tasks, while the PC returns the calculation results to the microcontroller.
Because the PC's computing speed and software functions are very powerful, it can complete the vacuum gauge pressure more complex calculations, improve the measurement accuracy; At the same time can have a rich parameter display, friendly man-machine interface. RS485-based communication design allows one PC to connect 1 to 256 microcontrollers (up to 256 thermocouple regulators and 256 ionization regulators). For example, the calibration of the thermocouple regulator can perform very accurate interpolation calculation according to the thermocouple regulatory curve.
Each embedded measurement and control module in the vacuum measurement is an object defined by the CformView class. This module design is suitable for function expansion. When a new measurement and control module needs to be added, only one module can be defined.
There are two ways to display the waveform of the signal: first, after the display and real-time display. After the first acquisition, the display is to store the collected data in the data file, after calculation and processing, and then call the -Moveto(), -Lineto() function to connect to the waveform and display it on the screen. For real-time display, threads available in VC can be utilized. This article designs two threads: One uses a class Array to define a dynamic array, the collected data is stored in the array, and one is used for data processing and waveform display.
The forced circulation pump does not rely on the centrifugal force of the impeller to the liquid, but uses the thrust of the rotating impeller blades to make the sent liquid flow along the direction of the pump axis. When the pump shaft is driven by the motor to rotate, because the blade has a certain helix angle with the axis of the pump shaft, a thrust (or lift) is generated on the liquid, and the liquid is pushed out and discharged along the discharge pipe. When the liquid is pushed out, a partial vacuum is formed at the original position, and the liquid outside will be sucked into the impeller along the inlet pipe under the action of atmospheric pressure. As long as the impeller keeps rotating, the pump can continuously suck in and discharge liquid. The forced circulation pump works by using the horizontal thrust along the direction of the pump axis generated by the rotation of the impeller, so it is also called a horizontal axial flow pump. Mainly used in the evaporation of diaphragm method caustic soda, phosphoric acid, vacuum salt production, lactic acid, calcium lactate, alumina, titanium dioxide, calcium chloride, ammonium chloride, sodium chlorate, sugar, molten salt, paper, waste water and other industries. Concentration and cooling, in order to improve the production capacity of the equipment, increase the heat transfer coefficient of the heat exchanger for forced circulation. Therefore, it can also be called an axial flow evaporative circulation pump.
Forced Circulation Pump,Circulation Pump,Recirculating Pump,Centrifugal Pumps
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