Joint

Abstract

A joint where breakage of a pressure sensor connection nut and a flare copper tube connection nut can be prevented. A joint (50) is a joint for communicating a first fluid path and a second fluid path of a nut member (20) having a second fluid path (Pp), a female screw section (22), and a first taper section (21), and the joint has a pushrod (52) and a body (51). The body has a pushrod receiving space (SPi), a communication path (Pi2), a seal structure forming section (53, 163), and a male screw section (54). The pushrod receiving space receives the pushrod such that a portion of the pushrod projects in the pushrod longitudinal direction (X). The communication path is the path communicated with the first fluid path. The seal structure forming section (53, 163) is provided at an end section on the pushrod projection side (X1) so as to surround the outer periphery of the pushrod receiving space and is capable of forming a seal structure when in contact with the first taper section. The male screw section can be screwed into the female screw section in the pushrod longitudinal direction. When the female screw section and the male screw section are screwed to each other, the seal structure forming section is in contact with the first taper section. Further, a part of that portion of the pushrod which projects from the pushrod receiving space comes into contact with a part of the nut member to move the pushrod in the pushrod longitudinal direction to the opposite side (X2) to the pushrod projection side, the pushrod thereby causing the second fluid path and the communication path to communicate.

Description

technical field [0001] The present invention relates to a joint for connecting a pressure sensor or a bell mouth copper pipe to other pipes. Background technique [0002] In order to connect pressure sensors, flared copper pipes, etc. to other piping, parts called fittings are often used. In such joints, it is well known among those skilled in the art that a connection portion is sealed by deformation of a metal packing such as copper packing (for example, refer to Patent Document 1). [0003] Figure 1(a) shows a representative example of such a joint. As shown in FIG. [0004] The push rod 12 has the contact part 12a, the 1st flow path Pc11, and the 2nd flow path Pc12. The abutting portion 12a is provided at one end portion in the longitudinal direction X of the push rod. And, the contact taper part 12b is provided in this contact part 12a. In addition, as can be seen from FIG. 1( a ), the abutment tapered portion 12 b is provided at the end portion of the abutment por...

AI Technical Summary

Problems solved by technology

[0014] However, the included angles β, γ formed by the inclination directions Sp, Sf of the nut taper portions 21, 41 of the pressure sensor connection nut 20 or the bell mouth copper pipe connection nut 40 and the push rod length direction X are smaller than those of the abutment taper portion 12b. When the angle α formed between the inclined direction Sc1 and the push rod length direction X is screwed until the copper gasket 13 is about to be deformed, the pressure sensor connecting nut 20 or the bell mouth copper pipe connecting nut 40 is deformed. In the worst case , there is a problem of cracking of the pressure sensor connection nut 20 or the bell mouth copper pipe connection nut 40 (refer to Fig. 1(a), Fig. 1(b) and Fig. 1(e))

Images