Types suction side and their use
According to a constructive implementation of on-board pumps are ordinary (simple) and overturned. In conventional suction slots located in the vertical plane, overturned - in the horizontal. If the slot is located on-board suction on one side of the mirror separation hazards, then the suction is called one-sided, or odnobortovym. When placing the slots on two opposite sides of the mirror suction side is called bilateral or dvuhbortovym. If the gap at an angle (usually direct) to each other, the suction is called the angular. At round machines are sucking ring, semiring, and the horseshoe.
If on one side of the mirror is unhealthy side suction, and the other - a gap for air, then a device called a suction from the vent (pereduvkoy). Suction vent to be named differently activated by suction.
Fig. 24 schematically shows three versions of bilateral suction side of the rectangular source of hazard.
Unilateral onboard pumps are effective and beneficial for air flow only when the small width of serviced mirror (bath, table and troughs), and bilateral pumps used for larger width of the mirror. Distributed by the misconception that the one-sided pumps advantageous bilateral on air consumption. This misconception is based on the applicable where an incorrect method of calculation,
Breakthrough of the pollutant in the room is mostly in the bath free. The closer to the mirror will be pressed removes particles of harmful substances, the lower the risk of "breakthrough", - in the room. Toxic hazard than standing out, the closer to the mirror must be their way. Conditional height hazards on the mirror of their separation is called the height of the spectrum of flow, or high range hazards.
Overturned flatbed pumps began to enter into practice in the mid-50's. They are widely promoted, considering that these pumps more efficient than conventional and requires much less air flow.
Subsequent studies professor. V. Baturin have shown that in many cases overturned on-board pumps more efficient than conventional only if the level of solution in the bath is relatively low and is located at a distance equal to two or three values of gap width, ie at a distance of 150 - 300 mm.
Overturned flatbed pumps is still relatively little in common practice. Oversee their work in a production environment is still insufficient. Overturned flatbed pumps cover part of the mirror, which is not always appropriate. Round bath or vehicles are almost never overturned supplied with suction.
Overturned flatbed pumps can be used to remove harmful substances from the long and narrow troughs with relatively high sides. In these trenches, for example, to release the slag, it can overlap with one side of the mirror suction. The height of the gutter can be quite large without compromising technology.