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  Damper apparatus for air conditioning systemRelated Patent Categories: Ventilation, Having Inlet Airway, Including Automatic Control MeansDamper apparatus for air conditioning system description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070218828, Damper apparatus for air conditioning system. Brief Patent Description - Full Patent Description - Patent Application Claims
CLAIM OF PRIORITY [0001] This application claims the benefit of Korean Patent Application No. 2006-24934 filed on Mar. 17, 2006, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to an air volume control apparatus (hereinafter, referred to as a damper apparatus) for automatically controlling air volume supplied to and exhausted from a room in accordance with temperature change therein. More particularly, the invention relates to a damper apparatus for an air conditioning system which exerts air resistance in accordance with open angle of the damper blade to air flow in a duct to effectively suppress air overflow due to the biased damper blade, and which measures average air flow velocity by measuring average differential pressure or dynamic pressure at many locations within the duct to accurately calculate air volume, thereby more accurately adjusting air volume in accordance with opening ratio of the damper blade. [0004] 2. Description of the Related Art [0005] In general, an air conditioning system as a part of an automatic control system for a building includes a damper apparatus for adjusting volume of air supplied to or exhausted from a room in order to maintain pleasant room temperature or conserve energy by optimally controlling the room temperature. [0006] FIG. 1 is an overall configuration view of such an air conditioning system. [0007] As shown in FIG. 1, conventional damper apparatuses 200 are provided in the air conditioning system, more particularly, installed in a supply air duct 210 through which outside air is supplied, an exhaust air duct 310 through which outgoing air is exhausted, and a return duct 410 for returning the re-circulated air. Each of the damper apparatuses 200 includes a plurality of damper blades 230 for adjusting air volume flowing therethrough and an actuator 240 for rotating the damper blades 230. [0008] The conventional air conditioning system also includes a filter 332 for filtering out foreign material in the supply air, and a heating unit 222 for heating the supply air to a predetermined temperature, a cooling unit 223 for cooling down the supply air to a predetermined temperature and a humidifier 224 for providing moisture to the supply air. [0009] In addition, a supply air fan 232 is disposed inside the supply air duct 210, and an exhaust air fan 234 is disposed inside the exhaust air duct 310. [0010] As shown in FIG. 2, in the conventional damper apparatus 200 for an air conditioning system, when outside air is introduced to the air introduction duct 210, a differential pressure sensor 250 senses pressures from the front and back sides of the damper blade 230 to input the differential pressure to a controller 260. The controller 260 arithmetically calculates the differential pressure of the outside air sensed by the differential pressure sensor 250 and the cross-sectional area of the duct 210 to calculate the air volume inside of the duct 210. [0011] In order to adjust the opening ratio of the damper blade 230, the controller 260 calculates the difference between the current room temperature and the desired room temperature and calculates the air volume that needs to be supplied to the room considering the volume of the room. Then, the controller 260 calculates the opening ratio of the damper blade 230 corresponding to the air volume to be supplied. [0012] Then, the controller 260 operates the actuator 240 to control the damper blade 230 in accordance with the opening ratio calculated. [0013] Therefore, in the conventional damper apparatus 200 for the air conditioning system, the actuator 240 rotates the damper blade 230 in accordance with the calculated result of the controller 260, increasing or decreasing the opening ratio to adjust the temperature as desired by the user. As such, the conventional damper apparatus 200 for the air conditioning system achieves air volume control through adjusting the opening ratio of the damper blade 230, and thus it is essential that the air volume should be accurately adjusted corresponding to the opening ratio. [0014] FIG. 3 is a graph showing the opening ratio and the air volume change ratio obtained by the above conventional damper apparatus 200 for the air conditioning system. [0015] The most ideal characteristics of the damper apparatus 200 for the air conditioning system is to obtain an air volume change ratio line B identical with line A in direct proportion to the opening ratio. When these lines are in agreement, it is most desirable because the controller 260 provided in the damper apparatus 200 for the air conditioning system is able to adjust the opening ratio as desired via the actuator 240 and the damper blade 230, thereby providing accurate volume of air corresponding to the opening ratio. [0016] Examining the air volume change ratio line B as shown in FIG. 3, as the damper blade 230 is rotated in an arbitrary angle .theta. to be at about 50% of the opening ratio, the resultant air volume change ratio is too large at about 80% or more due to air overflow. [0017] The reason for this is because, at an arbitrary opening ratio, the damper blade 230 induces the air flow to move from an upper region (front side) to a lower region (back side) with respect to the rotation axis 230a. In this process, the biased damper blade 230 exerts acceleration to the air flow to result in air overflow in which greater volume of air flows in the lower region of the damper blade 230. [0018] Therefore, the air volume change ratio with respect to the opening ratio is expressed as a saturation curve of line B, greatly deviating from line A which is in direct proportion to the opening ratio. [0019] Therefore, the air volume change ratio curve B obtained by the damper apparatus 200 for the air conditioning system is completely different from line A which is in direct proportion to the opening ratio, indicating as a result, that it is difficult for the user to adjust air volume via adjusting the open angle of the damper blade. Therefore, the air overflow occurring with the conventional damper apparatus 200 for the air conditioning system must be suppressed to accurately adjust air volume in accordance with the opening ratio. [0020] Therefore, there have been suggested several conventional technologies to overcome such a problem. [0021] An example of such conventional technologies is suggested in Japanese Patent Application Publication Hei 6-337162. [0022] In this conventional technology, each of a plurality of blades are designated into each of a plurality of regions with each blade individually controlled in a different direction from one another, thereby obtaining an air volume change ratio for the entire damper apparatus, which approximates to the line in direct proportion to the opening ratio of the damper apparatus. Continue reading about Damper apparatus for air conditioning system... Full patent description for Damper apparatus for air conditioning system Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Damper apparatus for air conditioning system patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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