Several pressure-reducing methods of throttling device
Throttling device pressure method Throttling device pressure method, there are five kinds of orifice plate in terms of: angular contact pressure, flange pressure, span pressure, theoretical pressure and tube access pressure. As far as nozzles are concerned, only angled pressure and span pressure are used.
(l) The angle between the upper and lower pressure-retrieving holes and the front and rear end faces of the orifice plate (nozzle) are equal to half the diameter of the pressure-receiving hole, or equal to half the width of the pressure-gap annular gap. The penetrating point is exactly flush with the end face of the orifice plate, and the angled access pressure includes the ring chamber pressure and the separate drilling pressure.
(2) The distance between the center of the pressure on the upper and lower sides of the flange and the front and rear faces of the orifice plate is (25.4±0.8)mm.
(3) The distance between the center of the pressure taking hole on the upstream side and the front end face of the orifice (nozzle) is 1D, and the distance between the center of the pressure taking hole on the downstream side and the rear end face of the orifice (nozzle) is 1/2D.
(4) The distance between the center of the pressure taking hole on the upstream side of the theoretical pressure taking method and the front end face of the orifice plate is 1D ± 0.1D, and the spacing between the center line of the pressure taking hole on the downstream side and the rear end face of the orifice plate is β=d/D. Different sizes.
(5) Pipe connection pressure The center line of the pressure inlet hole on the upstream side is 2.5D from the front end face of the orifice plate, and the center line on the downstream side of the pressure extraction hole is 8D from the rear end face of the orifice plate.
Among the above five pressure-recovery methods, the most commonly used angle pressure method is flange pressure, followed by the flange pressure method. The main medium is the pressure difference between the gas liquid and the steam. For details, please refer to the throttle device design manual, or consult the relevant technical personnel of the company.
The circuit responsible for powering a laser diode is protected against reversed polarity. High current Schottky diode
of an extremely low forward voltage secures the laser diode against connecting reversed voltage with the aim of protecting frequently the most expensive part of the entire device - a laser diode. In turn, the low forward voltage does not cause excessive heat loss during normal operation.
The analog input is protected by a 5V1 Zener diode. On occasion, there appears a voltage higher than 5V. Despite everything, this input should not be used with higher voltages.
A microcontroller ensures the proper operation of the entire system.
At the start, the microcontroller is checking the connection with a thermistor. If there is no thermistor used the WARNING LED is blinking but the driver is still working. If the connection with the thermistor is lost during normal work, the microcontroller turns off the laser diode supply circuit and does not allow for its further load. It also switches off the DIODE LED and switches on the WARNING LED. The TEC line is also switched off. The same situation happens when the thermistor reaches the temperature above 50 degrees Celsius.
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