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褰撲綘璧拌繘鐚満鏃讹紝閫氬父浼氱湅鍒扮尓鑸嶅澧欐寕鐫€涓€鎺掓帓鐨勯鏈猴紝鏁撮綈鍙堝．瑙傘€備粩缁嗚瀵燂紝浣犱細鍙戠幇锛屼笉鍚岃鏍煎昂瀵哥殑椋庢満閮借鏈夋垨鐧借壊鎴栭粦鑹茬殑椋庢満鍠囧彮鍙ｃ€傞偅涔堬紝涓轰粈涔堣缁欓鏈哄畨瑁呭枃鍙彛鍛紵瀹夎鍠囧彮鍙ｅ張鏄浣曞奖鍝嶉鏈虹殑鎬ц兘鍛紵澶у涓€璧锋潵閫氳繃Hog Slat鎬婚儴宸ョ▼甯堢殑鏂囩珷浜嗚В涓€涓嬶紒

Take a look at any fan performance chart, and you'll notice adding a discharge cone to a fan increases its performance. While almost everyone accepts this as fact, most of us don't know why it improves performance.

鐪嬬湅椋庢満鎬ц兘鍥捐〃灏变細鍙戠幇缁欓鏈哄鍔犱竴涓枃鍙彛鍙互鏀瑰杽椋庢満鎬ц兘銆傚敖绠″嚑涔庢墍鏈変汉閮界煡閬撹繖鏄釜浜嬪疄锛岀劧鑰屽ぇ澶氭暟浜哄嵈涓嶇煡閬撴槸涓轰粈涔堛€�

Tip1

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The reason is air disturbance.

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The fast-moving air exiting the fan pushes against the static air outside the fan housing, causing it to swirl.The swirling air creates a disturbance at the blade tips, which effectively reduces the diameter of the fan causing it to move less air. Adding a discharge cone directs the exiting air along the cone wall, preventing it from being disrupted by the outside air, and allowing it to flow smoothly out the cone.

椋庢満涓揩閫熸祦鍑虹殑姘旀祦锛屾帹鍔ㄩ鏈哄澹冲鐨勬皵娴侊紝寮曡捣姘旀祦鏃嬭浆銆傛棆杞殑姘旀祦浼氬湪鍙剁墖椤剁閫犳垚骞叉壈锛岀缉灏忎簡椋庢満鍙剁墖杈撻€佹皵娴佺殑鐩村緞鑼冨洿锛屽鑷磋緭閫佺殑姘旀祦閲忛檷浣庛€傜粰椋庢満澧炲姞涓€涓枃鍙彛璁╂皵娴佹部鐫€鍠囧彮鍙ｅ鐩存帴娴佸嚭锛� 闃叉姘旀祦琚閮ㄧ┖姘旈樆鏂紝淇濊瘉鍏跺钩绋宠緭鍑恒€�

Also, using a bell-shaped discharge cone, instead of a straight-wall design, permits the exiting air to expand. The air expansion reduces the backpressure against the fan, allowing for increased air movement.

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Numerous references have established 7-degree slope as the most effective cone angle.Wider cone angles allow the airflow to separate from the cone walls resulting in the formation of turbulence. The standard length for a discharge cone is between one to one and a half times the diameter of the fan. While there is some performance increase by lengthening the cone, this subjects the cones to increased damage from snow or high winds.

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There has been no question on the benefits of adding cones to fans located inside facilities designed with positive pressure systems. The same performance increase occurs if the fans operate in a positive or negative system.

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Tip2

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When selecting smaller fans for winter ventilation, adding a cone is not the best choice. Instead, add a wind diverter to protect the fan from strong winds that decrease its delivery.

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One downside to using discharge cones is increased maintenance from weather damage. It is not uncommon to see sections missing from multi-piece cones after heavy snowfall or strong winds. The missing parts will decrease the benefits of using a cone.

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Tip3

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When installing fans with cones, be sure and allow for the increased center spacing. The flair of the cone doesn’t permit the fans to be mounted as close together. Also, be aware of the extra bracing required on a building end wall when installing a bank of tunnel fans. Ice and snow can build up on the cones putting additional stress on the end wall. Consult your building contractor for details.

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