Abstract: An anti-crash helicopter seat integrating multiple protections, including a main framework, a weighing sensor, a magnetorheological damper system, an upper body forced tensioning and quick disengagement system, a seat pan, a multifunctional vest and a controller, wherein the seat pan is slidably connected with the main framework in a vertical direction, the magnetorheological damper system is fixedly arranged on the seat pan and is connected with the main framework by the weighing sensor, the upper body forced tensioning and quick disengagement system is arranged on the seat pan, the multifunctional vest is connected with the seat pan by the upper body forced tensioning and quick disengagement system, and the controller is connected with the weighing sensor and the magnetorheological damper system respectively.

Abstract: A plate heat exchanger includes a number of first heat exchange plates and a number of second heat exchange plates. The plate heat exchanger has a first inter-plate channel and a second inter-plate channel. The first inter-plate channel is located between a front surface of the second heat exchange plate and an adjacent first heat exchange plate. The second inter-plate channel is located between a back surface of the second heat exchange plate and another adjacent first heat exchange plate. The first heat exchange plate has a first flat joint portion and a second flat joint portion. The front surface of the second flat joint portion is spaced apart from an adjacent first flat joint portion. The plate heat exchanger includes at least one connection portion connecting the front surface of the second flat joint portion and the adjacent first flat joint portion.