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    • 7. 发明公开
    • LOW NOISE COOLING DEVICE
    • 低噪音冷却装置
    • EP2229536A2
    • 2010-09-22
    • EP08858308.3
    • 2008-11-26
    • Koninklijke Philips Electronics N.V.
    • AARTS, Ronaldus., M.LASANCE, Clemens, J., M.NIEUWENDIJK, Joris, A., M.OUWELTJES, Okke
    • F04D33/00F04F7/00H05K7/20
    • F04D33/00F04F7/00
    • A cooling device (1) using pulsating fluid for cooling of an object, comprising: a transducer (2) having a membrane adapted to generate pressure waves at a working frequency (fw), and a cavity (4) enclosing a first side of the membrane. The cavity (4) has at least one opening (5) adapted to emit a pulsating net output fluid flow towards the object, wherein the opening (5) is in communication with a second side of the membrane. The cavity (4) is sufficiently small to prevent fluid in the cavity (4) from acting as a spring in a resonating mass-spring system in the working range. This is advantageous as a volume velocity (u1) at the opening is essentially equal to a volume velocity (u1′) at the second side of the membrane, apart from a minus sign. Thus, at the working frequency the pulsating net output fluid can be largely cancelled due to the counter phase with the pressure waves on the second side of the membrane resulting in a close to zero far-field volume velocity. Thus a low sound level is achieved, at a low cost, without requiring mechanical symmetry.
    • 1。一种使用脉动流体来冷却物体的冷却装置(1),包括:具有适于在工作频率(fw)产生压力波的薄膜的换能器(2);以及腔体(4),所述腔体(4) 膜。 腔体(4)具有至少一个开口(5),该开口适于朝向物体发射脉动的净输出流体流,其中开口(5)与膜的第二侧连通。 空腔(4)足够小以防止空腔(4)中的流体在工作范围内用作共振质量弹簧系统中的弹簧。 这是有利的,因为开口处的体积速度(u1)基本上等于膜的第二侧处的体积速度(u1'),除了负号之外。 因此,在工作频率下,脉动的净输出流体可以由于与膜的第二侧上的压力波相反的相位而被大大地消除,导致接近零的远场体积速度。 因此,以低成本实现低声级,而不需要机械对称性。