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Setting of the Roots blower vent line

Release Date:

2016-05-25 14:20

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Roots blowers employ three types of surge‑relief lines: straight, stepped, and curved. Both the straight and stepped lines should be positioned at a flow rate approximately 10% above the surge line. The curved line can be set at a flow rate about 7% above the surge line; in general, a curve that closely follows the shape of the surge line is the most cost‑effective approach. This configuration also provides a wider operating range, though its control system is more complex. By contrast, a straight‑line relief system has a simpler control mechanism but poorer efficiency and a narrower operating range. In practice, the relief line typically consists of several segments with different slopes—arranged from left to right, these correspond to anti‑rotational stall protection, surge prevention, and pressure‑limiting functions.

　　Roots blowers employ three types of surge‑relief lines: straight, stepped, and curved. Both the straight and stepped lines should be positioned at a flow rate approximately 10% above the surge line. The curved line can be set at a flow rate about 7% above the surge line; in general, a curve that closely follows the surge line is the most cost‑effective approach. This configuration also provides a wider operating range, though its control system is more complex. By contrast, a straight‑line relief system has a simpler control mechanism but poorer efficiency and a narrower operating range. In practice, surge‑relief lines are typically composed of several segments with different slopes—starting from the left and proceeding to the right, these segments correspond to anti‑rotational stall protection, surge prevention, and pressure‑limiting functions, among others.
　　 Throughout the year, variations in suction‑air temperature cause the performance curve of a Roots blower to shift, resulting in different surge lines. For surge‑protection systems that employ either a single‑slope straight line or a piecewise linear curve with varying slopes, the flow‑rate–pressure ratio can be adjusted—by modifying the slope of the relief line—to accommodate the distinct suction‑air conditions prevailing in each season.
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