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Copper tube end sealing method

A copper tube and tube end technology, applied in the field of tube end sealing of copper tubes, can solve the problems of reduced secondary workability and the like

Inactive Publication Date: 2007-05-23
SUMITOMO LIGHT METAL INDS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Various attempts have been made to improve the airtightness of the tube end with regard to the sealing cap, but in the sealing of the sealing cap, the inner surface of the copper tube activated by the removal of oil often occurs oxidative discoloration, and Causes reduction in secondary workability such as thin tube bending (ヘアピンビげ processing) and pipe expansion processing performed by the user
In addition, since the sealing cap made of PVC or the like is disposed of after use, it is not preferable from an environmental point of view.

Method used

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  • Copper tube end sealing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, comparative example 1

[0018] Seal the end of the ACR copper pipe (smooth copper pipe) with an outer diameter of 8mm (thickness: 0.30mm) by the following methods (A) and (B). As shown in Figure 1, put the sealed side into the water and connect Connect the opposite side to the pump, and use the pump to input air into the pipe at a pressure of 0.8 MPa to perform an airtightness maintenance evaluation test. At this time, no air bubbles from the sealing side were observed in the sealing of the method (A). , but it was confirmed that air bubbles were generated from the sealing side in the sealing of the method (B). In addition, after annealing, when the inside of the LWC tube of the ACR copper tube is replaced with an inert gas or dry oxygen, the purge gas pressure (Pa ji gas pressure) is at most about 0.6 MPa, and a pressure slightly higher than this pressure is used as the test pressure.

[0019] Method (A): Place a support member with a width of 5mm (5mm ...

Embodiment 2

[0021] Embodiment 2, comparative example 2

[0022] With the method (C) shown below and the method (B) above, one end of the LWC tube of the ACR copper tube (copper tube with a groove on the inner surface) with an outer diameter of 8 mm (thickness: 0.30 mm) is sealed, and the connector is passed Install a pressure gauge near the sealing part, and after replacing the inside of the tube with an inert gas with a purge gas pressure of 0.6MPa, use the same method to seal the other end, and use the pressure gauge to measure the residual pressure change in the tube through The results of the comparison are shown in Fig. 2. In the method (C) of sealing (the sealing in Fig. 2), the residual pressure in the tube is kept at a high pressure and kept constant. In contrast, in the method (B) of sealing ( In FIG. 2 , it is the cap), it was confirmed that the residual pressure in the tube gradually decreased with the passage of days. In addition, in both methods, although the pressure is see...

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Abstract

A copper tube end sealing method which is executed after the displacement reaction using oxidative stain inert gas or dry oxygen which are capable of preventing the oil from being removed and activating the inner surface of the copper tube. The method is characterized in that the ends of the tube are pressed in the radial direction to connect.

Description

technical field [0001] The present invention relates to a pipe end sealing method for copper pipes, and more specifically, relates to a method for sealing pipes for the purpose of preventing foreign matter, moisture, etc. A pipe end sealing method for copper pipes at the end of the pipe. Background technique [0002] Among copper pipes, such as LWC pipes and straight pipes (outer diameter: 4 to 30mm) of copper pipes for ACR, there are smooth copper pipes with smooth inner surface, and grooves on the inner surface with spiral fine grooves formed on the inner surface. Although the copper tubes are usually shipped in the annealed state, these copper tubes are required to have a high inner surface cleanliness with less residual oil on the inner surface and less residue. After blowing inert gas or dry oxygen, a sealing cap made of PVC or the like is inserted into the pipe end to seal the pipe end (for example, refer to Japanese Patent Laid-Open No. Hei 9-53791). [0003] Variou...

Claims

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Application Information

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IPC IPC(8): B21D19/00
Inventor 森田浩之
Owner SUMITOMO LIGHT METAL INDS LTD
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