Heat exchanger

A heat exchanger, comprising:

• a plurality of flat pipes, wherein the plurality of flat pipes are arranged at intervals;
• first sealing cushion blocks, arranged between two adjacent flat pipes, wherein the first sealing cushion blocks are located on end portions of each flat pipe in the two adjacent flat pipes, so as to seal gaps between two adjacent flat pipes by the first sealing cushion blocks;
• and
• a flow collecting shell, provided with a first opening portion, wherein at least part of the first sealing cushion blocks and end portions of the flat pipes are all inserted into the first opening portion, so that the flow collecting shell, the flat pipes and the first sealing cushion blocks are welded to form a flow collecting channel in an encircling manner;
• wherein the first opening portion is arranged in a communication manner in an extending direction of the first opening portion, and the first sealing cushion blocks and the flat pipes are alternately arranged and stacked in the extending direction of the first opening, a composite layer is disposed on the surface of the flat pipe, after the composite layer is melted, two pipe plates of the flat pipe are kept pressed and fit, when the heat exchanger is welded, the flat pipe is freely declined in the extending direction of the first opening portion under a pre-tightening action;
• wherein the flow collecting shell comprises a main body portion and a plug-in portion, wherein the plug-in portion is arranged on the main body portion, the plug-in portion is arranged at an end portion of the main body portion, the plug-in portion is provided with the first opening portion, and at least part of the first sealing cushion block and an end portion of the each flat pipe are plugged into the plug-in portion;
• wherein the plug-in portion comprises a first plug board and a second plug board, the first plug board and the second plug board are oppositely arranged on both ends of the main body portion, and the first plug board and the second plug board are arranged at intervals to form the first opening portion, so that at least part of the first sealing cushion block and the end portion of each flat pipe are all plugged between the first plug board and the second plug board;
• wherein the first sealing cushion block comprises a first main body block and a first plug-in block, the first plug-in block is arranged on the first main body block, the first main body block is arranged at the end portion of the flat pipe, and the first plug-in block is plugged into the first opening portion;
• the first sealing cushion block is a T-shaped block, the first plug-in block is plugged into the first opening portion, the first main body block is located outside the first opening portion.