Electric diaphragm pump related notes and use

Electric diaphragm pump related notes and uses

First, precautions

1. Electric diaphragm pump start-stop load operation: diaphragm pump is driven by frequency conversion motor. If the start-stop load is too large or too small, in order to avoid the above situation as far as possible, the rigid regulation of start-stop load is controlled at about 30%, and the installation of the instrument to increase or decrease the load must be completed within a period of time. From the technical realization of frequency converter effective maintenance.

2, diaphragm pump instrument air and lubricating oil pressure system operation: diaphragm pump instrument air and lubricating oil pressure and main motor interlock. The injection and drainage valves of the propulsion fluid are air closing valves. They should always maintain a certain air pressure. The minimum operating pressure of both valves is not less than 0.4 mpa, so the instrument air pressure is generally maintained above 015 mpa even after the pump is stopped. To avoid insufficient or excessive liquid in the propulsion chamber, the air supplied to the valve is filtered and the oil is atomized. When the diaphragm pump is running, the lubricating oil pressure should not be lower than the pressure interlock value (0115MPa), the filter pressure difference of the lubricating oil outlet should not be too large, the steel ball in the lubricating oil flow peephole should be in the upper limit position, the adjustment range E should not be too large when adjusting the flow, so as to avoid the instantaneous flow too fast and cause chain jump. Through the above process improvement, master the key points of operation, diaphragm pump always has a stable process environment in operation. It has only jumped once in the past year due to electrical reasons, resulting in a long, safe and efficient operation.

3, the flow characteristics of the diaphragm pump refers to the relationship between the medium through the valve relative flow and displacement (the relative opening of the valve). There are four ideal flow characteristics: straight line, equal percentage (logarithm), parabola and fast opening. Spool characteristic curve and shape, commonly used ideal flow characteristics are straight line, equal percentage (logarithm) and fast opening.

4. The choice of flow characteristics of diaphragm pump can be calculated theoretically, but the methods and equations used are very complex. The empirical criterion is adopted to consider the following aspects: 1) the analysis and selection of the adjustment quality of the adjustment system; 2) Consideration of process pipeline; 3) Load change analysis.

5, choose the flow characteristics of the diaphragm pump, according to its flow characteristics to determine the shape and structure of the spool. But for diaphragm valve and butterfly valve, because of its structural characteristics, by changing the surface shape of the valve core, it is impossible to achieve the required flow characteristics. This can be achieved by changing the shape of the feedback CAM of the valve positioner.

Two, main uses: 1, all kinds of highly toxic, flammable, volatile liquid. 2, a variety of strong acids, alkali and corrosive liquids. 3, high temperature medium can be transported at 150℃ 4, as a variety of filter press before the pressure feeding device. 5. Hot water recovery and recycling. 6. Oil tanker, oil depot and oil handling. 7, pump pickles, jam, mashed potatoes, chocolate, etc. 8, pump paint, gum, pigment adhesive. 9, porcelain glaze, cement grouting, mortar, mud. 10, all kinds of rubber latex, organic solvents and fillers. 11, use the pump to clean up the tanker warehouse, absorb the sewage and residual oil in the warehouse. 12. Hops and baking powder, mud, syrup and molasses. 13. Pump sewage and sediment from mines, tunnels, tunnels and sewers. 14, absorb a variety of special media.

Three, performance profile: DBY electric diaphragm pump has the following characteristics: 1, no irrigation water, self-priming capacity up to 7 meters. 2. Good throughput. Particles and mud less than 10 mm in diameter pass easily. 3, due to the separation of diaphragm and conveying medium and driving machinery, diaphragm can be divided into neoprene rubber, nitrile rubber, fluorine rubber, tetrafluoroethylene, etc., can fully meet the requirements of different users. 4, according to user requirements, through the pump body of the medium can be divided into cast iron, stainless steel and aluminum alloy. Motors can be divided into ordinary type and explosion-proof type. The motor and reducer (1) drive the crankshaft (3) to rotate through the bearing box (2). The steering mechanism (4) converts the circular motion of the end of the crankshaft into the axial motion of the slide rod (5), which drives the reciprocating motion of the diaphragm. In the left and right pump chambers, the power of the upper and lower four one-way ball valves and diaphragms causes changes in the volume of the working chamber.