Tubular thick film heater protection apparatus and tubular thick film heater

A tubular thick film heater protection apparatus, configured to protect a tubular heater assembly and comprising:

• an upper tube, wherein the upper tube comprises an upper tube side surface and a toroid that are disposed with an inner space;
• an outer ring surface of the toroid is integrally connected to an upper portion of the upper tube side surface, and the radius of an inner ring surface of the toroid is less than the radius of an inner side surface of an inner tube of the tubular heater assembly;
• a flange downwardly extends along the inner ring surface of the toroid, and a space between the flange and an inner side wall of the upper tube side surface forms an upper groove that accommodates an upper portion of the tubular heater assembly;
• and a lower portion of the upper tube side surface is provided with a first locking mechanism;
• and
• a base, wherein a middle portion of the base is provided with a circular hole that allows a liquid discharge conduit of the tubular heater assembly to stick out, the base is further provided with a lower groove, the radius of an inner side surface of the lower groove is less than the radius of the inner side surface of the inner tube of the tubular heater assembly, and the radius of an outer side surface of the lower groove is greater than the radius of an outer side surface of an outer tube of the tubular heater assembly;
• the base is provided with an elastic contact piece, and when a lower portion of the tubular heater assembly is mounted on the lower groove, a terminal contact of the elastic contact piece can be connected to an electrode on the outer tube of the tubular heater assembly through contact;
• a side wall or the bottom of the base is provided with a wiring terminal, the wiring terminal is electrically connected to the elastic contact piece, and the wiring terminal can be externally connected to a power supply;
• and the base is provided with a second locking mechanism that matches and is locked with the first locking mechanism;
• wherein the upper tube is a cylinder, the base is a cylindrical base, the tubular thick film heater protection apparatus further comprises an annular sealing ring disposed on the cylindrical base, and the annular sealing ring is disposed in a junction portion between the cylinder and the cylindrical base;
• wherein the base is provided with a first positioning apparatus, and the first positioning apparatus is configured to determine a matching position between the tubular heater assembly and the base, so that the terminal contact of the elastic contact piece can be connected to the electrode on the outer tube of the tubular heater assembly through contact;
• and a second positioning apparatus is disposed on the flange downwardly extending along the inner ring surface of the toroid, and the second positioning apparatus is configured to determine a matching position between the tubular heater assembly and the upper tube to implement position matching between the first locking mechanism and the second locking mechanism.