家用空气消毒机HEPA filter使用有哪些常见问题?HEPA filter工作原理是什么?
生态环境已成为全民共同密切关注的焦点之一,其中大气污染、空气净化、尾气污染等空气污染问题的关注度也在逐渐上升。对此,也有越来越多的家庭使用空气消毒机来解决室内空气污染问题,包括室外空气的灰尘、汽车尾气、二手烟、异味等。目前,大多数家庭使用的空气消毒机所使用的滤网是HEPA滤网,HEPA滤网的孔径非常细微,当空气消毒净机在运行时,空气中能通过粗效滤网的直径更小的污染物就会被吸附,这些微粒污染物不仅包含空气中的粉尘、烟雾,而且还夹杂有环境中的各种微生物。
目前,空气消毒机(或净化器)已实现消毒和净化为一体,相较于传统空气净化器单一的净化作用,空气消毒净化机能够解决的环境问题更多。随着空气消毒机使用时间的推移,HEPA滤网上吸附的颗粒污染物、微生物的数量会越来越多,而灰尘中所含氮源加上吸附的“水汽”为很多微生物提供和较好的环境,就可能会促使微生物大量繁殖,造成室内空气的二次污染。与此同时,空气消毒机本身搭载的光触媒、紫外灯管、等离子发生器等杀菌灭毒设备,就可以有效解决此问题。
在大气环境中,尤其是在人口较多的公共场所,大气悬浮颗粒物中的真菌、细菌、病毒以及支原体等的数量高达数百种,其中就包含可引起流感、腮腺炎、哮喘等呼吸道疾病的病原体,如金黄色葡萄球菌、腮腺炎病毒等。虽然大多数微生物都是肉眼所看不见的,但是也需要了解相关的知识,以期更好地保护好自己和家人的健康卫生情况。
已经有研究表明,在空调的通风系统中所聚集的微生物的数量、种类较多,污染较为严重,因此在使用空调时需要多注意消毒的工作。若在使用空调的同时,搭配空气消毒机,对于室内控制温度、室内消毒双重效果有益于室内空气清洁。此外在空气消毒机使用过程中,需要注意的是定期、适时更换HEPA滤网,研究发现,家用空气净化器滤网上的霉菌等微生物的数量与使用时间成正相关,与清洁保养呈负相关。因此,笔者友情提醒正在使用或者将要使用空气消毒机的朋友,记得及时清洁、更换HEPA滤网。
那么什么是HEPA滤网?
Speaking of HEPA filters, HEPA has basically become the standard configuration of air purifiers, from a few hundred dollars to tens of thousands of dollars of purifiers HEPA filters carry a very large number of filtration roles.
High-Efficiency Particulate Air, or High-Efficiency Particulate Air Filter, or HEPA for short, is made of very fine fibers interwoven with a strong ability to capture particles, small pore size, large adsorption capacity, and high purification efficiency. According to the single filter net rate calculation, the standard HEPA filter can filter the air from small to 0.3 micron (hair diameter of 1/200) particles, filter net rate of at least 99.97%, is the haze, as well as bacteria, viruses, fungal spores and other pollutants of the most effective filtration medium, the best filtration performance can be 99.999995%, that is, every 20 million particles, can only have 1 particle, but not 1 particle. In other words, for every 20 million particles, only 1 particle can penetrate the HEPA filter membrane. At present, it is internationally recognized as a high-efficiency filtration material.
HEPA滤网是什么材质构成的?
Currently on the market HEPA material is mainly divided into PP (polypropylene) high-efficiency filter paper, PET filter paper, PP and PET composite high-efficiency filter paper and glass fiber high-efficiency filter paper. Among them, PP (polypropylene) is paper, therefore, generally can not be washed!
1、PP high efficiency filter paper
It is a new type of filtration material made of polypropylene by special hot melt method, the product is acid and alkali resistant, corrosion resistant, high melting point, stable performance, non-toxic, odorless, uniform distribution, low resistance, high efficiency, high strength, environmental protection, etc. The filtration effect of PP fiber can be achieved at the highest level of H14.
2、PET filter paper
It is made of polyester resin and other materials meltblown, high hardness, good stiffness, corrosion resistance, high temperature resistance, stable performance, but PET single filtration is relatively low, generally can only do H10-H11 level (90% ~ 99.5%), commonly used in sweepers, vacuum cleaners and other filtration precision requirements of the household electrical appliances or large-scale cleaning machine above.
3、Glass fiber high efficiency filter paper
Glass fiber high-efficiency filter paper, a very high gold content filter paper, has previously been used in the nuclear industry. Compared with plastic fibers, glass fibers are characterized by high temperature resistance, high dust holding capacity, good stability, durability and long life. Its most important advantage, however, lies in the fact that it guarantees a sufficiently high filtration efficiency in a single pass. Until today, the highest efficiency of the U15 ~ U17 filter, basically still mainly glass fiber. But the improvement of the filtration effect also brought about by the increase in wind resistance, normally more than 200Pa, can only rely on the increase in fan power to alleviate the lack of air volume.
HEPA滤网工作原理:
1. Sieve effect
When the size of the gap between media compositions (fibers, sieves, corrugated metal, etc.) is smaller than the particle diameter, the filter is designed to capture these particles. This principle is widely used in most filter designs and is entirely dependent on particle diameter size, media spacing and media density.
2. Inertia effect
The rapid change in air direction and the principle of inertia are utilized to separate large quantities (particles) from the air stream. Microparticles at a certain velocity tend to maintain that velocity and continue in the same direction. This principle is generally applied if the process particle concentration is high. And, in many cases, both the pre-filter mode and the more efficient final filter use this principle.
3. Interception effect
In order to achieve interception, a particle must enter from within a distance of a fiber radius. The particle thus comes into contact with the fiber and adheres to it. The difference between the interception principle and the embedding principle is that the intercepted particles are small and their inertia is not sufficient for the particles to continue in a straight line. They therefore flow with the air until they come into contact with the fibers.
Dust smaller than 1μm does not move with the airflow, but does "Brownian motion" due to the impact of air molecules. If it hits on the filter fiber, it will be captured. Therefore, the smaller the particle, the more intense the Brownian motion, the better the filtration effect.
Particles are filtered by van der Waals forces, also known as electrostatic adsorption. The filtration of particles below 0.3 microns, such as viral bodies, relies mainly on this effect.
Please go to "Backstage - User - Profile" to fill in your personal description.
© Kunshan Joy King Electronic Technology Co. Site Map Su ICP No. 17058908