Plate heat exchanger is a highly efficient and compact heat exchange equipment, widely used in heating, cooling, evaporation, condensation and other processes. It consists of a series of metal plates, forming a flow channel between the plates, so that the hot and cold fluids in the staggered flow between the plates, through the plates for heat exchange.
The core component of the plate heat exchanger is the plate, and its processing has an important impact on the performance and life of the heat exchanger. This article will introduce the processing of plate heat exchanger plate in detail.
01
Raw material preparation
Plate heat exchanger plate raw materials are mainly stainless steel, titanium, copper, nickel and other metal materials. These metal materials have good thermal conductivity and corrosion resistance, to meet the heat exchanger in different working conditions. Before processing the plate, the raw materials need to be inspected to ensure that their chemical composition, mechanical properties and other indicators meet the standard requirements.
02
Cutting
According to the design parameters of the heat exchanger, the raw material is cut. Cutting methods include shearing, plasma cutting, laser cutting and so on. Shearing is suitable for smaller thickness of the plate, plasma cutting and laser cutting is suitable for larger thickness or special shape requirements of the plate. When cutting down the material, ensure the flatness and dimensional accuracy of the cutting surface to avoid burrs and deformation.
03
Mould design
The shape and size of the plate heat exchanger sheet are determined according to the design requirements of the heat exchanger. In order to ensure the mass production quality and efficiency of the plate sheet, a special mould needs to be designed. The design of the mould should take into account the shape of the runner of the plate, the spacing between the plates, the strength and stiffness of the plate and other factors. The material of the mould is generally chosen as mould steel or hard alloy, which has high hardness and wear resistance.
04
Stamping moulding
The cut sheet is placed on the mould, and the sheet is stamped and formed by the press. In the process of stamping and forming, the pressure and speed should be controlled to ensure the accuracy of the shape and size of the sheet. After stamping and forming, the surface of the sheet may produce scratches, pits and other defects, which need to be sanded and polished.
05
Welding
For some special shapes or sizes of plates, it may be necessary to join them together by welding. Welding methods include argon arc welding, resistance welding and laser welding. When welding, it is necessary to ensure the quality of welding and the sealing performance of the weld to avoid defects such as porosity and cracks. After welding, the welding seam needs to be ground and polished to make it flat and smooth with the surface of the plate.
06
Cleaning
The plate may be contaminated with oil, dust and other impurities during processing, affecting the performance of the heat exchanger. Therefore, in the plate processing is completed, the need for cleaning. Cleaning methods include ultrasonic cleaning, spray cleaning and so on. After cleaning, the plate should be dried to avoid moisture residue.
07
Inspection
After the plate processing is completed, the plate needs to be inspected to ensure that its quality meets the standard requirements. Inspection items include dimensional accuracy, shape accuracy, surface quality, welding quality and so on. For the unqualified plate, it should be returned for repair or scrapped in time.
08
Assembly
Qualified plates will be assembled according to the design requirements of the heat exchanger. Assembly, to ensure that the spacing and angle between the plate is accurate, to avoid skewing and misalignment. After the assembly is completed, the heat exchanger should be pressure test and leakage test to ensure that its sealing performance is good.
09
Painting
In order to improve the corrosion resistance of the plate heat exchanger plate, the plate needs to be painted. Coating methods include spraying, electrophoresis, vacuum plating and so on. Coating to ensure that the coating is uniform, dense, to avoid bubbles, flaking and other defects.
10
Packing
Pack the coated sheet for delivery. Packaging should take moisture-proof, shock-proof, anti-scratch and other measures to ensure that the plate is not damaged in the transport process.
In summary, the processing of plate heat exchanger plate includes raw material preparation, cutting and discharging, mould design, stamping and forming, welding, cleaning, inspection, assembly, painting and packaging. These links are interrelated, and problems in any one link may affect the performance and life of the heat exchanger. Therefore, in the process of plate processing, the quality of each link should be strictly controlled to ensure the normal operation of the heat exchanger.
