Caulking structure and check valve

Abstract

This invention relates to a calking structure and a check valve, calking structures of cooper tube and valve base assembly are modified in the check valve, in order to avoid back leakage or vibration of the check valve. The valve base assembly, valve core and supporting part are disposed in the cooper tube. Stander of the supporting part is used for guiding and leading the valve core back to the valve base assembly during counterflow of the refrigerant. Rectangle grooves with cross section in tetragon shape are formed around the valve base assembly. Through roller calking around the cooper tube, calking grooves with cross section in tetragon shape are formed, so that wideness of the calking grooves is greater than that of the rectangle grooves, and depth of the calking grooves is also greater than that of the rectangle grooves, calking part of the cooper tube is fully embedded into the rectangle grooves in order to eliminate surplus space; also, large calking part for bearing end faceof the valve base assembly opposite to the valve core is formed on the cooper tube, meanwhile, a plurality of paired rectangle grooves and calking grooves are disposed while a plurality of delicate grooves are disposed around the rectangle grooves.

Description

Technical field [0001] The present invention relates to a densified structure of other metal parts that are tightly fixed in a cylindrical metal pipe (かしぁ固定する) and the inner circumference of the metal pipe, and a valve is fixed in the copper pipe by the tight structure Check valve for seat part. Background technique [0002] Conventionally, as disclosed in Japanese Patent Laid-Open No. 2006-200554 (Patent Document 1) and Japanese Patent Laid-Open No. 2007-40654 (Patent Document 2), in refrigeration cycles, a check is often used as an element constituting the circulation circuit. valve. [0003] FIG. 8(A) is a diagram showing an example of a conventional check valve. The check valve includes a copper pipe 5, a valve seat member 6, a valve element 7, and a bracket member 8, and the valve seat member 6 is fixed in the copper pipe 5. And the bracket member 8, in which the valve core 7 is provided. In the flow of the refrigerant in the refrigeration cycle, in the positive direction, ...

AI Technical Summary

Problems solved by technology

In this case, the superhigh pressure of carbon dioxide is applied in the closed state, especially for such a superhigh pressure refrigerant, the above-mentioned problem occurs in the above-mentioned conventional check valve.

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