Displacement of air flotation apparatus and water level regulation method which to have
Flotation skills because of its high efficiency, small volume of the device, easy operation, simple and has been widely used for. But the flotation technology also have not perfect place to reform, such as the release and blocking problem. Release just existing plans many anti blocking the pace, but still not ideal, but also from time to time there will be blocked. And as the residue scraping machine program also can not apply the scum rises the problem of aggregation. In this paper, the tension between flotation tank level and displacement regulating held some inquiry.
1, the water level and water discharge regulating Essentials
The author in the planned flotation device, also encountered the water level and the effluent flotation tank volume problem of mediation, through repeated comparison, finally identified as regulatory agencies are shown in Figure 1. Principle of this mechanism is: by float hinge at point 2 modulating float connecting rod height to determine the regulating stem height of 4 and 5 of the control valve, control valve directly affect the rubber pipe 8, a water area of changes of rubber tube, the drainage quantity control of floatation pond. When the water level rises, float rises, the lever moves up, engine connecting rod 4 and valve 5 up, amplifying the rubber tube water area, increase drainage; drainage volume increases, flotation tank water level must fall. Conversely, if the air float pool water landing, the buoy is landed, engine connecting rod 4 and a control valve control valve 5 down, 5 down certainly reduce rubber tube cross section, the elimination of displacement, displacement of water, flotation tank level increase. This automatic regulating balance, as long as according to undo the scum requirements, determine the height of water level, water level and the displacement between the automatic balance, saves manpower. The device structure is simple and practical, wonderful, is suitable for small institutions flotation device.
2, hydraulic strategy
Orifice flow strategy formula:
Q= w (2gH) 1/2 (1)
Type: Q- orifice water, m3/s;
Mu - velocity coefficient;
Omega orifice area, m3, omega = Pi d2/4 (d drainage pipe diameter);
The water level of H-, M.
According to (1) the orifice flow strategy essentials of , the adjustment mechanism is simplified as shown in figure 2:
If the water level to rise as high as H, to ensure that the displacement of Q solid, sure to narrow down the drain pipe area, set to narrow the area for delta omega, orifice deformation, value is stable, has created the following formula.
W (2gH) 1/2= (omega delta omega) [2g (H+ H)]1/2 (2)
Change equation: [OMEGA / Omega delta omega (]2= (H+ H) /H
The area of orifice design changes after Omega 1 is:
[(delta omega Omega Omega 1+) / 1]2= (H+ a H) /H (3)
1+2 (delta omega / Omega 1) + (delta omega / Omega 1) 2=1+ Delta H/H (4)
The merger of similar items: (delta omega / Omega 1]2 value is too small, careless excluding, have
2 (delta omega / Omega 1) = H/H (5)
The equation can be written as:
Delta H/H=2 (omega / Omega 1-1) (6)
From (6) type can be seen, H, Omega is constant, Delta H changes only with Omega 1, the feasibility of this formula for modulating the essentials of the theoretically further proof.
3 for example, strategy
The following parameters of a floating device: processing water content Q=20m3/h, high level of H=1.6m, d=40mm drainpipe, in order to improve the level of 0.04m, for drain area change?
The parameters into the formula (6), a
0.04/1.6=2 (omega / Omega 1-1)
A: Omega / Omega 1=1.0125
: Omega Omega 1/ =1/1.0125 = 98.8%
The result is a drainage pipe area change to the original 98.8%, rubber tubes for variation so small to do the drainage tube deformation department, is completely can probably meet the requirements of the water level adjustment.