A single-head electric heating tube structure with double insulation protection and its manufacturing method

Abstract

The invention relates to a single-end electric heating tube structure with the double insulation protection function and a manufacturing method of the single-end electric heating tube structure with the double insulation protection function. The single-end electric heating tube with the double insulation protection function comprises an outer tube and an inner assembly part, wherein the inner assembly part comprises two inner tube assemblies, terminals, an inner sleeve, an outer sleeve, a fuse protector and a temperature controller, each inner tube assembly comprises an inner tube, an upper guide-out rod, a lower guide-out rod, a resistance wire, an inner plug and magnesia powder, the upper guide-out rods, the resistance wires and the lower guide-out rods which are all connected well are inserted in the inner tubes so that the inner tube assemblies can be formed, one terminal is connected with one end of the temperature controller, the other end of the temperature controller is connected with the lower guide-out rod of the second inner tube assembly, a protecting middle piece is sleeved with the outer sleeve, and thus the inner assembly part can be formed. The single-end electric heating tube structure has the double insulation protection function and solves the problem that two resistance wires intertwine, cost is saved, the service life of a heater is prolonged, and the temperature resistance level of the product is increased.

Description

technical field [0001] The invention belongs to the technical field of electric heating elements, and in particular relates to a single-head electric heating tube structure with double insulation protection and a manufacturing method thereof. Background technique [0002] At present, there are many types of electric heating elements on electric heating equipment on the market, especially electric heating tubes. A product related to the present invention generally has the following disadvantages as attached figure 1 Shown: [0003] 1. The product of this structure is assembled first and then shrinks in diameter. During the shrinking process, the thermostat (22) and fuse (5) of the sensitive parts at the tail are easily damaged by external force and become invalid. Therefore, a protective thermostat (22) is required. and the protection box (25) of the fuse (5); the protection component takes up a large space, resulting in a reduction in the effective heating area, and at the ...

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Problems solved by technology

[0003] 1. The product of this structure is assembled first and then shrinks in diameter. During the shrinking process, the thermostat (22) and fuse (5) of the sensitive parts at the tail are easily damaged by external force and become invalid. Therefore, a protective thermostat (22) is required. and the protection box (25) of the fuse (5); the protection component takes up a large space, resulting in a reduction in the effective heating area, and at the same time limited by the temperature of the protection component, the maximum loadable power density of the product decreases

[0004] 2. Since the resistance wire (10) and the resistance wire (18) are separated by the added magnesium oxide powder 8, it is easy to cause the resistance wire (10) and the resistance wire (18) to be entangled in the process of filling and shrinking. Together, it will cause short circuit or broken wire, especially for products with small resistance wire diameter, the scrap rate is very high

[0005] 3. This structure needs to fix the relative position of the parts and keep the resistance wire in the middle of many auxiliary parts, such as the middle protection ring (12), the inner plug (14), the middle protection piece (20), the fixing ring (23), magnesium Powder dry (24), etc., at the same time, the dimensional tolerance accuracy of auxiliary parts is high, which not only leads to scrap due to complicated process, difficult control, but also high material cost and production cost

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