Views:0 Author:Site Editor Publish Time: 2020-10-16 Origin:Site
According to the flow form of the heat exchange medium, the plates of the plate heat exchanger are divided into two types: unilateral flow and diagonal flow. Correspondingly, the plate heat exchanger gaskets are divided into unilateral flow and diagonal flow according to the flow form of the heat exchange medium.
Unilateral flow means that the heat exchange medium flowing in from the right corner hole of the heat exchange plate finally flows out from the right corner hole. Similarly, the heat exchange medium flowing in from the left corner hole finally flows out from the left corner hole.
Diagonal flow means that the heat exchange fluid flows from the right corner hole and then flows out from the left corner hole, or the fluid flowing in from the left corner hole flows out from the right corner hole, showing a diagonal flow pattern. In terms of heat exchange efficiency, the diagonal flow method is better than the unilateral flow, but the cost of the unilateral flow method is relatively low, so when the heat exchange efficiency can be met, the unilateral flow method is generally adopted.
Plate heat exchanger gaskets can be divided into 3 types according to the installation method on the heat exchange plates
(1) Direct paste type, that is, after applying sealant on the gasket, it is directly glued to the installation groove of the heat exchange plate.
(2) The rubber nail inlay type is that the heat exchange plate is designed with assembly holes, and the rubber nails are designed on the side of the sealing gasket. After the sealing gasket is placed in the installation slot, the rubber nails are inlaid in the assembly hole.
(3) Snap-fitting type, is to design a buckle on the side of the gasket, and use the buckle to buckle the gasket on the heat exchange plate.
For the above three methods, the adhesive gasket has a simple structure and is the easiest to process, but it is relatively troublesome to install and remove. Inlaid and snap-mounted gaskets have complex structures and are more troublesome to process, but they are relatively easy to install and disassemble. Plate heat exchanger gaskets are divided into symmetrical and asymmetrical shapes according to the product's cross-sectional shape. Symmetrical shapes are generally used for diagonal flow plates. The upper and lower sealing surfaces are flat, symmetrical along the horizontal plane, and can be installed positively and negatively. The asymmetrical ground is a flat surface, and the upper sealing surface can be a flat surface, a curved surface, an inclined surface, etc.