39results about How to "Reduced resistance pressure drop" patented technology

The invention relates to a high-efficiency and low-resistance nanofiber air filtering material for a gauze mask and a preparation method of the filtering material. According to the preparation method, by virtue of a steam field compensation and control technology, an equal-electric voltage spinning technology and a nanofiber structure with a bead structure and innovatively introducing single fibers in an electrostatic spinning process, the high-efficiency and low-resistance nanofiber air filtering material which is free of adhesion between fibers and fluffy in structure, has a three-dimensional cavity and is in a net communication structure is obtained in a one-step molding manner. According to the high-efficiency and low-resistance nanofiber air filtering material for the gauze mask, the filtering efficiency on granules which are 0.006-2.5 microns can reach over 99.999%; and the piezoresistance is less than 30Pa. The high-efficiency and low-resistance nanofiber air filtering material is simple in preparation technology, low in cost, high in filtering efficiency and small in resistance pressure drop, and has a wide application prospect in the field of individual protective masks.

The invention provides an air filtering material capable of releasing negative ions and a preparation method of the air filtering material. The air filtering material capable of releasing the negative ions is characterized by comprising a base material and a nanometer fiber layer arranged on the base material, wherein the base material is of a mesh shape; the nanometer fiber layer comprises nanometer fiber, a water-absorption and water-retention substance and a negative ion functional substance. The preparation method of the mesh-shaped negative ion filtering material is characterized in that a high water-absorption and water-retention polymer and the negative ion functional substance are mixed and prepared into a solution, and then spinning is performed; or the high water-absorption and water-retention polymer and the negative ion functional substance are put into different liquid storage devices for simultaneous spinning. The mesh-shaped negative ion filtering material has the advantages of high fiber and base material combining strength, high negative ion release quantity, high device operability and the like, and has wide application prospects in the aspect of filtering materials for air purifiers, window screens and masks.

The invention relates to a micron fiber / nanofiber composite filter material and a preparation method thereof. The preparation method includes: in an electrostatic spinning process, an annular gradient solvent vapor quick removing device is adopted for one-step forming on a receiving substrate to obtain the micron fiber and nanofiber integrated three-dimensional structural composite filter material according to a double-region isolation spinning control technique. Efficiency of the micron fiber / nanofiber composite filter material in filtering of 0.02-10micron particles reaches 99.95% or above, and resistance pressure drop is smaller than 40Pa. The preparation method is simple in process, controllability in fiber diameter and pore diameter is achieved, the obtained composite filter material is of micron / nano scale in fiber diameter and pore diameter, a great filtration performance is achieved, and the composite filter material is widely applicable to air purifying products such as mask filter elements, air purifiers and air conditioners.

The present invention discloses a core body of a flat-plate heat exchanger for a fresh air ventilator, which comprises quadrangular plastic heat exchanging membranes, a top plate in the same shape as that of the plastic heat exchanging membranes, a bottom plate and sealing strips. The upper surfaces on the near edges of two opposite edges of the plastic heat exchanging membranes with odd number are fixedly connected with the lower surfaces on the near edges of two opposite edges of the plastic heat exchanging membranes with even number through the sealing strips to form first airflow channels, the upper surface on the near edges of another two opposite edges of the plastic heat exchanging membranes with even number are fixedly connected with the lower surfaces on the near edges of two opposite edges of the other plastic heat exchanging membranes with odd number through the sealing strips to form second airflow channels crisscrossed with the adjacent first airflow channels, the top plate is fixedly connected with the uppermost plastic heat exchanging membranes through the sealing strips, and the bottom plate is fixedly connected with the lowermost plastic heat exchanging membranes through the sealing strip. The present invention has the advantages of favorable heat transfer performance, high heat exchanging efficiency, low weight and cost, simple structure, low production and running cost, convenient installation and easy integration with constructions.

The invention provides a functional filter material capable of releasing a far infrared ray and a preparation method thereof. The functional filter material capable of releasing the far infrared ray is characterized by comprising a base material and a nanofiber membrane arranged on the base material, the nanofiber membrane comprises at least one level unit, each level unit comprises a plane layer formed by nanofiber disordered gathering and a cavity structure formed by directionally arranging and stacking nanofiber, some or all cavity structures are filled with substances capable of releasing the far infrared ray, and the nanofiber is mixed with the substances capable of releasing the far infrared ray. The functional filter material capable of releasing the far infrared ray has the advantages of being high in filter efficiency, large in resistance pressure drop, high in far infrared emissivity and the like, and has the wide application prospect in the field of air filtering.