Film type liquid heater and uniform heating method thereof

A film type liquid heater, comprising a heating pipe, wherein a heating film layer is coated around an outer surface of the heating pipe, and the heating film layer is electrically connected to an external power supply to realize an electric heating function;

• connecting pipes are arranged at two axial ends of the heating pipe;
• a flow splitting column is arranged in an internal space of the heating pipe, the flow splitting column extends in an axial direction of the heating pipe, and a heating chamber is formed between an inner side of the heating pipe and the flow splitting column;
• the flow splitting column is only directly mounted and fixedly connected [with] at the two axial ends of the heating pipe;
• the flow splitting column is made of a stainless steel material;
• flow splitting grooves are formed at two axial ends of the flow splitting column;
• and the flow splitting grooves communicate the heating chamber with a through space inside the connecting pipes;
• two sealing connection components are arranged at two ends of the heating pipe, respectively;
• each of the sealing connection components comprises a sealing cover, a compression baffle, a pre-tightening nut, a fastening nut, a pre-tightening spring and a fastening connector;
• the fastening connectors are arranged on an outer side of the heating pipe and an inner side of a barrel;
• two sealing covers are respectively arranged on outer sides of inner ends of the connecting pipes and fixedly connected to the connecting pipes, respectively;
• the two compression baffles are respectively arranged on outer sides of the sealing covers at the respective ends;
• the heating pipe is connected between inner sides of the two sealing covers on left and right ends;
• the fastening connectors respectively run through the two compression baffles;
• the fastening nuts are fixedly connected to right ends of the fastening connectors through threads and compressed onto outer end faces of one of the two compression baffles;
• pre-tightening nuts compress the pre-tightening springs sleeved on the fastening connectors onto outer end faces of the other of the two compression baffles;
• and, the fastening nuts, the fastening connectors, the pre-tightening nuts and the pre-tightening springs are coordinated to exert a pre-tightening force on two axial ends of the heating pipe and the sealing covers so as to realize tight connection between the heating pipe and the sealing covers;
• wherein the heating pipe is of a quartz glass structure;
• wherein the heating film layer contains a graphene material;
• wherein sealing covers are arranged at two axial ends of the heating pipe, the sealing covers are fixedly connected to the connecting pipes, the sealing covers are pressed against axial end faces of the heating pipe, and sealing rings are arranged between the sealing covers and the axial end faces of the heating pipe;
• and
• wherein the fastening connectors comprise at least two rods uniformly distributed in a circumferential direction;
• and wherein the sealing covers are provided with protrusions surrounding the radial outer side of the heating pipe.