Preparation of inner diameter of spiral heat dissipation fins and outer diameter of metal tubes for components

Preparation of inner diameter of spiral heat dissipation fins and outer diameter of metal tubes for components

1. When designing components, the flange heating tube manufacturer should consider the effects of thermal expansion, erosion, oxidation, creep, etc., to avoid malfunctions caused by deformation during normal operation.

The design of the internal structure of the components should ensure that the materials used for manufacturing the components are not damaged under high temperatures or high temperature conditions that may be encountered during processing, and can still work reliably

The welding structure design of components should comply with relevant standards. The welding seams of pressure components, especially the parts inside the container, should be minimized and the position of the welding seams should be easy to inspect.

4. The design of the shell and its accessories for pressure bearing components must comply with relevant standards

5. For components with spiral fins at both ends, the spiral fins should fully cover the heating length of the component along the axis. The inner diameter of the spiral fins should be matched with the outer diameter of the metal tube of the component, and the two ends should be spot welded to the metal tube wall

6. Components (including ends) need to be sealed

Note: If there is an agreement, temporary sealing measures or no sealing can be used at the end, and the sealing performance of the end will not be evaluated.

7. Components used for heating corrosive media need to use corrosion-resistant metal tubes or protective sleeves to ensure the service life of the components.

When the shell is made of ordinary steel or other alloy materials with better performance than ordinary steel, the wall thickness should not be less than 0.35mm. When the shell is made of materials such as copper or alloy, it needs to have corresponding mechanical strength to adapt to harsh working environments.

The bending radius of the component should not be less than 2.5 times the pipe diameter.

10. The bending shape of the component needs to ensure that the inner end of the lead out rod is on the straight part of the pipe, and the distance from the starting point of the bending should not be less than 10mm

11. The gap between the two current carrying parts in the component with a potential difference greater than 40V, as well as between the current carrying part and the shell, and the thickness of the insulation filling material should not be less than 1mm. The distance between the exposed lead out rod and the shell shall not be less than 1mm

Note: If there is an agreement, the above gaps and distances can be less than 1mm, but it is necessary to strengthen the design and carefully manufacture to ensure performance and reliability.

The length inside the component lead out rod tube should not be less than the provisions in Table 3.

The cross-sectional area of the component lead out rod should not be less than 7 times the cross-sectional area of the electric heating wire.

Www.superbheater.com