Influence of plate thickness and size of plate heat exchanger on pressure

The plate stiffness is in accordance with the requirements of the fingerboard piece assembled in clamping the fixed plate and a movable plate, and the effect of different medium on both sides of the deformation ability of pressure resistance.

In the normal working condition, in addition to the plate must have enough strength, but also need to have a certain degree of rigidity, in order to control the deformation of the plate, making the heat exchange medium in the plate channel liquid layer thickness is uniform, ensure the heat transfer efficiency. According to the principle of thermal expansion and cold contraction, the increase or decrease of temperature will cause the expansion or contraction of the plate, but the expansion or contraction of the plate will be restricted by the fixed plate and the movable plate. When the thermal expansion and contraction can not be completely free, it will produce stress, which requires the heat transfer plate should have enough stiffness and pressure resistance. In the 1 Structure Design of the plate, it is necessary to arrange the supporting points and increase the reinforcement. The stiffness of the plate depends not only on the density and precision of the position, but also on the length, width and thickness of the plate.

At present, the domestic and international heat exchange plate shape is different, there are hundreds of forms. In terms of aspect ratio 1, 2, 1, 3, etc.. Under special operating conditions there are 1: 1, 1: 4, 1: 5, 1: 6. Different working conditions with different aspect ratio, the bearing capacity is not the same. After years of development and research, the author found that the aspect ratio of the plate is one of the important factors that affect the stiffness of the plate.

The design of heat exchanger plate has a tendency to narrow and long in the condition of liquid and liquid. The narrow profile plate can effectively reduce the flow of the fluid, so that it can flow in the channel as far as possible to enhance the heat transfer effect. In addition, it also provides a very favorable condition to improve the lateral stiffness of the plate. The vertical plate stiffness by 4 ~ 6 of the clamp bolt and the fixed plate, a movable pressure plate to ensure; and in the transverse calculation plate stiffness, should not only consider the two plate clamping force after the deformation, but also consider the liquid pressure and the sealing gasket force, deformation, and bearing plate the dislocation and other factors. When the lateral stiffness of the plate is not enough to overcome the deformation, it is possible to leak between the gasket and the plate. Practice has proved that the length and width ratio of the plate is about 1: 25, 1: 3, the pressure bearing capacity of the plate heat exchanger can reach 2.5MPa, which is lower than that of the plate, and the pressure bearing capacity of the whole machine is in the range of 1 - 1.6MPa.