Screw pump is relying on one or several screw mutual engagement, the volume of space formed to change the fluid delivery. According to the number of intermeshing screw different, can be divided into single screw pump, twin screw pump, three screw pump and so on. According to the location of the screw can be divided into vertical or horizontal. Including twin-screw pump outdoor mesh screw pump, a pump, the active rod, driven rod, gear and bearings and other components. One each of the active rod and the driven rod is a left-hand thread and a right-hand thread. Screw pump is relying on the number of screw thread teeth meshing, the formation of space between the screw thread volume of the liquid in the screw rotation. It is the difference between the centrifugal pump is a constant volume, that is, the flow does not vary with the outlet pressure is essentially constant, with the difference between the plunger pump flow and pressure is low. Application and chemical and petrochemical fields. First, the characteristics: 3G three screw pump is a positive displacement pump, due to the active screw and the driven screw on the spiral groove intermeshing with the inner surface of the three holes with the bushing to pump the import and export between the formation of a few steps Sealed chambers, these moveable sealed chambers will constantly move the liquid axially from the pump inlet to the pump outlet and stepwise pressurize the fluid to form a continuous, steady, axially displaced pressurized liquid. Second, the scope of application of media and performance: Three screw pump fluid is a variety of non-solid particles, non-corrosive oils and similar lubricants, liquid viscosity of 1.2 ~ 100 ° E (3.0 ~ 760cst) High-viscosity liquid can also be transported by viscosity reduction after heating. Flow range of 0.2 ~ 590m3 / h, the maximum working pressure of 100bar, the maximum temperature of 150 ℃. Third, the structure: 1, the structure is simple: a variety of structural forms, the general small flow 0.2 ~ 6.5m3 / h pump body and bushing into one (collectively, pump body), shaft seal for the mechanical seal. Medium flow pump bushing above is a separate part fixed in the pump body, large flow pump made of double suction structure horizontal installation, the shaft seal according to the different transmission media have mechanical seal and packing seal two. Marine pump installation in the form of horizontal and vertical two, the original motivation for the exchange, DC marine motor. 2, Long service life: The active screw of the three screw pump is driven by the motor. There is no mechanical contact between the main rod and the rod, and the pressure liquid is driven to rotate from the rod around the axis. The main rod, the rod, the screw rod and the liner There is a layer of oil film between the protection, so pump mechanical friction minimal life expectancy semi-permanent. 3, the infusion of liquid in the pump for axial uniform linear motion, so the pressure pulsation is small, stable flow, low noise, due to small rotating inertia, the starting torque and vibration is small. 4, with high suction capacity. 5, in order to ensure the safety of pumps, motors and piping systems, medium-volume screw pumps are equipped with safety valve above the pressure when the pressure exceeds the set pressure relief valve, high-pressure oil will return to the pump inlet.
Reed Switch Fuel Level Sensor, also called float fuel level senosr, it is done by sealed reed switches positioned inside the main shaft of the sensor. A float with built-in magnets then triggers the reed switch relays, generating a potential-signal with resistance, current, or voltage value that increases or decreases according to the fluid level, then give the signal to the gauge via wires, which shows the right level reading by pointer. In the whole reed switch level sensors,the float is the only moving part of the sensor,thereby minimizing potential mechanical failures to get the precision measurement.