Low-flow-resistance internal and external pressure type balanced expansion joint adopting conical ring cavity flow channel

A low-flow-resistance internal and external pressure type balanced expansion joint adopting a conical ring cavity flow channel comprises an inlet end pipe, an inlet end taper pipe, an outer pipe, a first flow guide connecting plate, a first conical end socket, a first sealing plate, a flow guide cylinder, a first corrugated pipe assembly, a second sealing plate, a second conical end socket, a second flow guide connecting plate, an outlet end taper pipe, a second corrugated pipe assembly and an outlet end pipe. The inlet end pipe, the inlet end taper pipe, the outer pipe, the outlet end taper pipe, the second corrugated pipe assembly and the outlet end pipe are sequentially connected in series, and the large-diameter end of the inlet end taper pipe and the large-diameter end of the outlet end taper pipe are both connected with the two ends of the outer pipe. A first conical end socket, a first sealing plate, a flow guide cylinder, a first corrugated pipe assembly, a second sealing plate, a second conical end s