Heat exchanger with elbow convenient to replace

The heat exchanger comprises a heat exchanger body, a pipe bending device and a push-out device, a flange plate is installed at the right end of the heat exchanger body, the other side of the flange plate is connected with a sealing cover in a sealed mode through an installation bolt, and an installation groove is formed in the inner wall of the heat exchanger body. A pipe bending device is slidably connected into the mounting groove, a push-out device used for pushing the pipe bending device is mounted on the left side of the pipe bending device, and one end of the pipe bending device penetrates through the sealing cover and is in sealed connection with the sealing cover through a sealing bolt. The problems that after some existing heat exchangers in the current market are used for a period of time, heat exchange bent pipes in the heat exchangers need to be detached and replaced to prevent the bent pipes from being blocked, however, shells of some existing heat exchangers are welded, when the bent pipes in t