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Products Specification

Connecting Mechanism for Thin Stainless Steel Pipe and Joint

 

Connecting Mechanism for Thin Stainless Steel Pipe and Joint

This invention relates to a connecting mechanism for a thin stainless steel pipe and a joint which can simply and securely connect the thin stainless steel pipe and the joint in the field and can easily know a flaw of a coupling work.


   

This kind of related art includes a structure disclosed in Japanese Utility Model Publication No. 2-37015 (patent document 1) which has been proposed by the applicant of the present application in advance. When describing based on FIG. 10 showing a connecting structure for a thin stainless steel pipe and a joint which is obtained by further adding an improvement to this related art, this related art is constructed by a thin stainless steel pipe 1 in which a chevron type projection portion 5 having two inclined surfaces 5a and 5b is formed in an outer periphery of an end portion, a joint 2 in which a male thread portion 7 is formed in an outer peripheral surface of an end portion as well as having an inner diameter to which the thin stainless steel pipe 1 is inserted, a nut 4 which has a female thread portion 8 engaging with the male thread portion 7 of the joint 2 as well as having a fitting portion 11 outwardly fitted to the thin stainless steel pipe 1 so as to oppose to the joint 2 on the boundary of the chevron type projection portion 5, and a packing 3 which is provided between the joint 2 and the thin stainless steel pipe 1.


   

The packing 3 is formed in such a manner as to be closely attached to each of the one inclined surface 5b of the chevron type projection portion 5 formed in the thin stainless steel pipe 1 a time of screwing and firmly attaching the female thread portion 8 of the nut 4 and the male thread portion 7 of the joint 2, the joint contact surface 9 of the nut 4, and a packing pressing surface 6a and a packing outer peripheral contact surface 6b corresponding to an inner side surface of the packing fitting portion 6 of the joint 2, and is made of an elastic material such as a rubber or the like having an approximately polygonal horizontal cross sectional shape.


   

In the nut 4, there is formed an inclined notch portion 10 closely attached to the other inclined surface 5a of the chevron type projection portion 5 in an inner end portion of the fitting portion 11 outwardly fitted to the thin stainless steel pipe 1, and there is formed a joint contact surface 9 with which the opening end portion 2a of the joint 2 is brought into contact at a time of screwing and firmly attaching the female thread portion 8 of the nut 4 and the male thread portion 7 of the joint 2. The joint contact surface 9 is formed based on an inner diameter difference between the fitting portion 11 and the female thread portion 8.


   

In the joint 2, there is formed a packing fitting portion 6 for fitting the packing 3 closely attached to one inclined surface 5b close to the end portion of the chevron type projection portion 5 to an inner periphery close to an open end portion 2a thereof. Further, a pipe insertion hole 2d expanded at a thickness of the thin stainless steel pipe 1 for inserting an end portion of the thin stainless steel pipe 1 is formed in both ends of an inner hole 2c in a center portion.


   

In the joint 2, there is formed a packing fitting portion 6 for fitting the packing 3 closely attached to one inclined surface 5b close to the end portion of the chevron type projection portion 5 to an inner periphery close to an open end portion 2a thereof. Further, a pipe insertion hole 2d expanded at a thickness of the thin stainless steel pipe 1 for inserting an end portion of the thin stainless steel pipe 1 is formed in both ends of an inner hole 2c in a center portion.