A device for measuring ventilation resistance of fruit and vegetable packaging includes a variable frequency speed regulating exhaust fan, anemometer, negative pressure passage, platform scale, temperature and humidity sensor and pressure differential meter; the negative pressure passage is provided with an air inlet and an air outlet; the platform scale is used for placing fruit and vegetable packaging, and the platform scale is arranged in a negative pressure passage; the inlet of the exhaust fan is connected with the air outlet of the negative pressure passage; and the negative pressure passage is connected with the air outlet of the negative pressure passage. The pressure channel is provided with a pressure measuring hole at the intake side near the intake port, and a pressure measuring hole at the outlet side near the intake port. The pressure measuring hole at the intake side is connected with the first pressure measuring interface of the pressure differential gauge through the first connecting pipe, and the pressure measuring hole at the outlet side is connected with the second pressure measuring interface of the pressure differential gauge through the second connecting pipe. The temperature and humidity sensor is located in the negative pressure channel and used to measure the temperature and humidity of the fruit and vegetable packaging area. The outlet of the exhaust fan is provided with an anemometer. The invention uses N groups of ventilation resistance data of fruit and vegetable packaging to fit into equation, and then accurately calculates viscous resistance coefficient and inertia resistance coefficient according to pressure drop characteristics.
【技术实现步骤摘要】
一种测量果蔬包装通风阻力的装置及测量通风阻力方法
本专利技术涉及一种测量果蔬包装通风阻力的装置及测量通风阻力方法。
技术介绍
随着计算流体力学仿真技术的成熟,越来越多涉及流体的工作被计算流体力学(CFD)软件所代替。在温湿度场等模拟过程中,常常把货物区域设置成多孔介质区域。多孔介质区域的模拟需确定开孔率、粘性阻力系数和惯性阻力系数,其中开孔率可以通过测量和计算得出,但粘性阻力系数和惯性阻力系数常用经验公式计算得出,对于不同的货物差别较大。根据惯性阻力系数和粘性阻力系数的理论公式,可以得知,其值可通过压差计(即压降)的测定而得到,也即是通过获得压差计(即压降)即可准确计算粘性阻力系数和惯性阻力系数,但目前仍未有测量果蔬包装通风阻力的装置和方法。因此,亟需一种能够解决上述问题的测量果蔬包装通风阻力的装置和方法。
技术实现思路
本专利技术目的在于克服现有技术的缺点与不足,提供了一种测量果蔬包装通风阻力的装置,旨在能够准确测量果蔬包装的通风阻力,从而准确计算粘性阻力系数和惯性阻力系数。为实现上述目的,本专利技术采用的技术方案如下:一种测量果蔬包装通风阻力的装置,包括变频调速的抽风机、风速计、负压通道、台秤、温湿度传感器和压差计;所述负压通道设有进风口和出风口,所述台秤用于放置果蔬包装,且所述台秤设在负压通道内;所述抽风机的进口与负压通道的出风口相连通;所述负压通道在进风口附近设有进风侧测压孔、在出风口附近设有出风侧测压孔,所述进风侧测压孔通过第一连接管与压差计的第一测压接口连接,所述出风侧测压孔通过第二连接管与压差计的第二测压接口连接;所述温湿度传感器设在负压通道内并 ...
【技术保护点】
1.一种测量果蔬包装通风阻力的装置,其特征在于:包括变频调速的抽风机、风速计、负压通道、台秤、温湿度传感器和压差计;所述负压通道设有进风口和出风口,所述台秤用于放置果蔬包装,且所述台秤设在负压通道内;所述抽风机的进口与负压通道的出风口相连通;所述负压通道在进风口附近设有进风侧测压孔、在出风口附近设有出风侧测压孔,所述进风侧测压孔通过第一连接管与压差计的第一测压接口连接,所述出风侧测压孔通过第二连接管与压差计的第二测压接口连接;所述温湿度传感器设在负压通道内并用于测量果蔬包装所在区域的温湿度;所述抽风机的出风口处设有风速计。
【技术特征摘要】
1.一种测量果蔬包装通风阻力的装置,其特征在于:包括变频调速的抽风机、风速计、负压通道、台秤、温湿度传感器和压差计;所述负压通道设有进风口和出风口,所述台秤用于放置果蔬包装,且所述台秤设在负压通道内;所述抽风机的进口与负压通道的出风口相连通;所述负压通道在进风口附近设有进风侧测压孔、在出风口附近设有出风侧测压孔,所述进风侧测压孔通过第一连接管与压差计的第一测压接口连接,所述出风侧测压孔通过第二连接管与压差计的第二测压接口连接;所述温湿度传感器设在负压通道内并用于测量果蔬包装所在区域的温湿度;所述抽风机的出风口处设有风速计。2.根据权利要求1所述的测量果蔬包装通风阻力的装置,其特征在于:所述温湿度传感器为两个,分别为第一温湿度传感器和第二温湿度传感器,第一温湿度传感器设在台秤的进风侧,第二温湿度传感器设在台秤的出风侧,且第一温湿度传感器和第二温湿度传感器对称设置。3.根据权利要求1所述的测量果蔬包装通风阻力的装置,其特征在于:所述负...
【专利技术属性】
技术研发人员:郭嘉明,魏鑫钰,陆华忠,吕恩利,李斌,杜县南,任俊杰,李慧,
申请(专利权)人:华南农业大学,
类型:发明
国别省市:广东,44
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