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Pipe fastening structure

By designing the piping fastening structure at the lower part of the spherical and straight-tube necks, combined with welding or brazing connections, the co-rotation problem caused by direct tightening of the nuts is solved, achieving sealing and fastening reliability under high-pressure spray environments made of stainless steel. .

Active Publication Date: 2011-06-15
SANOH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the contrary, due to the sleeve, it has the disadvantages of increasing the number of parts, increasing the size of the nut, and increasing the weight

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0053] figure 1 A longitudinal section of the pipe fastening structure according to the first embodiment of the present invention is shown. in the figure 1 Among them, reference numeral 10 represents a metal pipe. Reference numeral 12 denotes a nut, and reference numeral 14 denotes a counterpart part to which the metal pipe 10 is connected. The pipe fastening structure includes a metal pipe end portion 16 positioned at an end portion of the metal pipe 10 and a nut 12 for fastening and connecting the metal pipe end portion 16 to the counterpart component 14 . In the present embodiment, the counterpart part 14 constitutes a joint. A spherical end portion 16 is joined to the front end of the metal pipe 10 , and the end portion 16 is directly pressed against the counterpart component 14 by a nut 12 . In such a pipe connection structure, unlike the conventional pipe connection structure, parts such as sleeves or washers are not interposed between the nut 12 and the tip portion ...

no. 2 Embodiment approach

[0124] then, Figure 8 The pipe fastening structure according to the second embodiment of the present invention is shown.

[0125] The second embodiment is common to the first embodiment in that the coefficient α that determines the outer diameter D2 of the first spherical portion 20 at the contact point of the sealing surface 27 and the second spherical surface at the contact point of the seat surface 25 are determined. The ratio of the coefficient β of the outer diameter D3 of the portion 21 is in

[0126] 1.0≥α / β≥0.80

[0127] range, (hereinafter, the third embodiment to the sixth embodiment are the same).

[0128] In this second embodiment, at the end of the inner diameter portion on the front side of the nut 12 , a stepped portion 30 in which the inner diameter is reduced at the end of the nut 12 is formed. The stepped portion 30 is formed at the inner diameter portion of the through hole 23 forming the nut 12 , and the through hole 23 has a reduced diameter so as to b...

no. 3 Embodiment approach

[0132] then, Figure 9 The pipe fastening structure according to the third embodiment of the present invention is shown.

[0133] In this third embodiment, at the boundary portion between the first spherical portion 20 and the second spherical portion 21, a shoulder portion 32 is formed, and the shoulder portion 32 is connected to the counterpart part that is the lip portion of the sealing surface 27 of the counterpart component 14. 14 is in contact with the end on the front side.

[0134] Thus, a shoulder 32 is formed at the end portion 16, whereby, if the nut 12 is tightened, as Figure 9 As shown, the shoulder portion 32 is pressed against the lip portion of the counterpart part 14, so that a torque for suppressing co-rotation is also generated on the lip portion. Since this torque is generated, Expression (2) holds true more reliably, and co-rotation can be prevented more reliably.

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PUM

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Abstract

A pipe fastening structure includes an end member attached to an end part of a metal pipe, and a nut for fastening the end member attached to the metal pipe to a counterpart. In the pipe fastening structure, the end member has a first spherical part to be brought into contact with a sealing surface of the counterpart, a second spherical part formed integrally with the first spherical part so as to be in contact with a sliding surface formed in the nut, and a neck continuous with the second spherical part and having the shape of a straight pipe. The outside diameter D1 of the neck is approximately equal to outside diameter D of the metal pipe, the respective centers of spheres respectively defining the first and the second spherical parts are on the axis of the neck, and the ratio of the ratio [alpha]=D2 / D, where D2 is a diameter of a contact circle on the first spherical part in contact with the sealing surface and D is the outside diameter of the metal pipe to the ratio [beta]=D3 / D, where D3 is a diameter of a contact circle on the second spherical part in contact with the sliding surface of the nut and D is the outside diameter of the metal pipe meet an expression: 1.0>=[alpha] / [beta]>=0.80.

Description

technical field [0001] The present invention relates to a piping fastening structure used for fuel piping of a diesel internal combustion engine or a gasoline internal combustion engine, and more particularly to a piping fastening structure for fastening an end portion of a metal pipe having a spherical shape to a counterpart component with a nut. Background technique [0002] In the fuel piping of a diesel internal combustion engine or a gasoline internal combustion engine, in order to connect a metal pipe that transports fuel at high pressure to a counterpart part of the engine, the end portion having a spherical shape is fastened and connected with a nut. In this tightening structure, by tightening the nut, the spherical end portion can be pressed against the seating surface of the other component to reliably prevent fuel leakage, and thus has been widely used in high-pressure fuel piping. [0003] Regarding the prior art of such a pipe fastening structure, for example, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L19/00
CPCF16L19/025F16L19/0225F02M55/005
Owner SANOH IND CO LTD
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