Spiral plate heat exchanger in the process of operation is mainly made of a lot of stamping corrugated sheet, according to a certain interval, all around by gasket sealing, and with the frame and compression screw overlap compression, plate and gasket four corner holes form the fluid distribution pipe and collection pipe, at the same time reasonably separate the cold and hot fluid, make it flow in the flow channel on both sides of each plate Heat exchange is carried out through plates.
Sealing structure of spiral plate heat exchanger
There are two kinds of seal for spiral plate heat exchanger, namely welding seal and gasket end cover seal.
① The channel to be sealed is padded into the steel plate with square steel and welded after rolling;
② The channel to be sealed shall be padded into the steel plate with round steel and welded after being rolled;
③ The spiral plate is rolled with special machine tool to form bevel edge. The smaller the rolling radius is, the greater the springback of flanging is.
Gasket end cover seal of spiral plate heat exchanger
After the spiral plate is rolled and welded, the narrow flange is assembled, the two ends of the spiral channel are machined, and then the channel is sealed with the inverted cone end cap and gasket. The gasket material is selected according to the medium characteristics and temperature; the connection between the inverted cone end cap and the spiral body adopts the upper clip, the lower clip and the nut. In order to improve the sealing performance of the spiral plate heat exchanger and prevent the short circuit of the medium in each spiral channel from affecting the heat transfer efficiency, the spiral body must be complete. If the spiral body defects and welding defects are found, they must be repaired to ensure the machining turning out.
The shell of spiral plate heat exchanger is a connection structure which bears internal pressure or external pressure. In order to improve the bearing capacity of shell, the shell of spiral plate heat exchanger is welded by two semicircular cylinders. The key part of this combination welding is the connecting plate. The connection between connecting plate and spiral plate and shell is to place the connecting plate on the spiral body, weld both sides, and then weld two semicircular shells and connecting plate. The welding structure adopts butt weld with lining plate, so as to ensure the welding quality of butt weld.
The spiral body of spiral plate heat exchanger is an elastic body. For such an elastic component, when it is compressed, it is easy to be compressed, so that the equipment can not operate normally. One method is to increase the thickness of spiral plate, which is not economical; the other method is to increase the number of spacing columns. Reduce the distance between columns. In order to improve the stiffness and bearing capacity of spiral plate.