JP2009085297A - Housing type pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a housing type pipe fitting capable of maintaining the sealing performance satisfactorily even in the case the inside of the piping has a positive pressure. <P>SOLUTION: The housing type pipe fitting 1 is equipped with a housing 10 in annular shape as a whole and a gasket 20 formed from an annular piece of resilient material. The section perpendicular to the circumferential direction of this gasket 20 is in a channel shape with the inside forming an open end, and each tip part thereof is furnished with an inner overhang 20a overhanging inward and an outer overhang 20b overhanging outward. The gasket 20 is attached to the peripheral surfaces of two connection ends in such a manner as straddling the two parts of piping 50 to be connected. The housing 10 is installed in such an arrangement as covering the gasket 20 while it presses the gasket 20 to the two parts of piping 50. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pipe joint for connecting a pipe through which a fluid passes, and more particularly to a housing type pipe joint which is a housing type pipe joint.

  Conventionally, various housing type pipe joints have been provided. FIG. 4 shows the configuration of a conventional housing type pipe joint. As shown in the figure, the housing-type pipe joint 100 includes a pair of housings 101 a and 101 b and a gasket 102. The gasket 102 is an annular elastic body that is mounted and arranged across both ends of the two pipes 110 to be connected facing each other. Each of the housings 101a and 101b is a semi-annular member, is disposed to face each other so as to sandwich the gasket 102, and both ends are fastened with bolts and nuts.

Such a housing-type pipe joint has an advantage that it can absorb the deflection and contraction of the piping through a gasket which is an elastic body at the connecting portion. Conventional housing-type pipe joints are disclosed in, for example, Patent Documents 1 to 3 below.
JP 2000-240868 A JP 2003-42361 A JP 2007-78052 A

  Incidentally, as shown in FIG. 4, the annular gasket 102 used in the conventional housing-type pipe joint 100 has a substantially U-shaped cross section perpendicular to the circumferential direction, and has a U-shaped tip that contacts the pipe 110. An overhanging portion 102a is formed to project inward.

  In such a configuration, when the pressure inside the pipe 110 is positive, the gasket 102 is in close contact with the inner surface of the housing 101 and the end surface of the pipe 110 as shown in FIG. Securing and preventing fluid leakage. In particular, the overhanging portion 102 a that protrudes to the inside of the U-shaped tip portion of the gasket 102 is in close contact with the end surface of the pipe 110 and reliably prevents leakage from the gap between the housing 101 and the pipe 110.

  However, when the pressure inside the pipe becomes negative, the gasket 102 is pressed inward. That is, as shown in FIG. 5B, the U-shaped tip portion of the gasket 102 is lifted inward, and the overhanging portion 102a in close contact with the pipe is lifted so as to be peeled off from the pipe. When the negative pressure is increased, the overhanging portion 102a is completely lifted, and the fluid may leak.

  The present invention has been made to solve the above-described problems, and provides a housing-type pipe joint that can maintain a sufficient sealing performance even when a negative pressure is applied, as well as when the inside of a pipe is a positive pressure. With the goal.

  In order to solve the above-mentioned problems, a housing-type pipe joint according to the present invention is mounted on the outer peripheral surface of both connection ends in a housing-type pipe joint for connecting pipes, straddling both of the two pipes faced to each other. In the cross-section orthogonal to the circumferential direction, the gasket is made of an annular elastic body, and has a substantially U-shape with an open end on the inside, and at both ends in contact with the outer peripheral surfaces of the two pipes, on the inside A gasket formed with an overhanging inner overhanging portion and an outer overhanging portion overhanging; and an annular housing arranged to cover the gasket while pressing the gasket against the pipe. It is characterized by.

  According to the housing type pipe joint according to the present invention, the sealing performance can be sufficiently maintained even if the inside of the pipe has a negative pressure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, based on FIG.1 and FIG.2, the structure of the housing type pipe joint which concerns on this embodiment is demonstrated. FIG. 1 is an exploded perspective view showing a configuration of a housing-type pipe joint according to the present embodiment. FIG. 2 is a cross-sectional view showing the configuration of the housing-type pipe joint according to the present embodiment.

  As shown in FIGS. 1 and 2, the housing-type pipe joint 1 includes a housing 10 and a gasket 20. The housing 10 includes a pair of housing main bodies 10a and 10b and two sets of bolts 15 and nuts 16 that are fastened with both ends of the housing main bodies 10a and 10b facing each other.

  Each of the housing bodies 10a and 10b is a semi-annular stainless steel member, and the cross section perpendicular to the circumferential direction has a U-shape with the inner side being an open end. The gasket 20 is accommodated in the interior surrounded by the housing bodies 10a and 10b.

  At both end portions of the housing main bodies 10a and 10b, overhang portions 11 are formed that are bent outward by approximately 180 degrees. A bolt hole 12 is formed at the center of the overhanging portion 11. When the pair of housing main bodies 10a and 10b are arranged to face each other, both the bolt holes 12 communicate with each other in a straight line. Therefore, the annular housing 10 can be configured as a whole by inserting the bolt 15 into the bolt hole 12 and fastening and fixing with the nut 16.

  An annular groove 51 is formed on the outer surface near the connection end of the pipe 50. The concave groove 51 is configured such that when the housing 10 is installed, the U-shaped tip portions of the housing main bodies 10a and 10b just fit. Thus, by fitting the tips of the housing main bodies 10a and 10b in the concave groove 51, the housing-type pipe joint 1 can be firmly fixed to the pipe 50, and the sealing performance can be improved.

  The gasket 20 is an annular elastic body made of EPDM (ethylene / propylene / diene rubber), and has a substantially U-shaped cross section perpendicular to the circumferential direction with the inner side being an open end. An inner projecting portion 20a projecting inward and an outer projecting portion 20b projecting outward are formed at both tip portions of the gasket 20, and both tip portions of the gasket 20 have an inverted T-shape. When the gasket 20 is installed, the outer surface (the inner surface of the annular gasket 20) connected from the inner overhanging portion 20a to the outer overhanging portion 20b is in close contact with the end surface of the pipe 50.

  When the pipe 50 is connected using the housing-type pipe joint 1 having such a configuration, first, the two pipes 50 and 50 are arranged on a straight line, and the connection end portions thereof are abutted with each other. At this time, the overhanging portions 20a and 20b on one side of the annular gasket 20 are put on the end of one piping 50, and the other piping 50 is inserted into the other overhanging portions 20a and 20b of the gasket 20. You can do that. As shown in FIG. 2, if the two pipes 50 are put together with a slight gap therebetween, expansion and contraction and bending of the pipes can be absorbed by the housing-type pipe joint 1.

  In this manner, the housing body 10a is configured to cover the gasket 20 while pressing the gasket 20 against the pipe 50 after the gasket 20 is mounted on the outer peripheral surfaces of both connection ends across the two pipes 50 to be connected. , 10b are arranged to face each other. And if each overhang | projection part 11 and 11 of housing main body 10a, 10b is fastened with the volt | bolt 15 and the nut 16, installation of the housing type pipe joint 1 will be completed and two piping 50, 50 will maintain sealing performance. Connected.

  The configuration of the housing-type pipe joint 1 according to the present embodiment has been described above. Hereinafter, the operation when the pressure inside the pipe 50 connected by the housing-type pipe joint 1 becomes positive and when the pressure becomes negative will be described. This will be described with reference to the drawings. FIG. 3 is a cross-sectional view showing a deformation mode of the gasket when the pressure in the pipe is changed, FIG. 3A is a cross-sectional view when the pressure in the pipe is positive, and FIG. It is sectional drawing when the inside is a negative pressure.

  As shown in FIG. 3A, when the pressure in the pipe 50 is positive, the pressure in the pipe 50 becomes higher than the external air pressure, so that the gasket 20 is deformed so as to expand outward. At this time, even if the wall of the gasket 20 is deformed to the outside, the outer surfaces of the overhang portions 20a and 20b are firmly attached to the connection end surface of the pipe 50, so that the sealing performance of the pipe 50 connection portion is ensured. Is secured.

  On the other hand, as shown in FIG. 3B, when the pressure in the pipe 50 becomes negative, the pressure in the pipe 50 becomes lower than the external air pressure, so that the gasket 20 is deformed so as to shrink inward. . At this time, even if the wall of the gasket 20 is deformed inward, the inner surfaces of the overhang portions 20a and 20b remain firmly adhered to the connection end surface of the pipe 50. Sexuality is guaranteed.

  As mentioned above, although the housing type pipe joint 1 which concerns on this embodiment was demonstrated, according to this embodiment, it is the inner side overhang | projection part 20a which protrudes inside at the edge part which contacts the piping 50 of the gasket 20 which is a cyclic | annular elastic body. And the outer projecting portion 20b projecting outward are formed, so that the projecting portions 20a and 20b are surely secured even when the pressure inside the pipe 50 becomes negative and the side wall of the gasket 20 is pulled inward. It can adhere to the outer surface of the connection end of the pipe 50 and prevent leakage.

  As mentioned above, although embodiment of this invention was described in detail, embodiment of this invention is not limited to the said embodiment, A various deformation | transformation is possible within the range which does not deviate from the main point of this invention. . For example, other materials can be used as appropriate for the materials of the housing and gasket according to the present embodiment. In this embodiment, EPDM is used as the material of the gasket, but synthetic rubber such as silicon rubber or fluoro rubber may be used as long as it is an elastic material.

  Further, the housing may be configured not only by butting two half-ring members but also by a housing composed of three 1/3 ring members, and any member that can cover the gasket while pressing the gasket against the pipe. It ’s fine.

  In this embodiment, the gasket has a substantially U-shape with a cross section orthogonal to the circumferential direction, and the inner side is an open end. However, the U-shape includes, of course, a U-shape and a C-shape. It is.

FIG. 1 is an exploded perspective view showing a configuration of a housing-type pipe joint according to the present embodiment. FIG. 2 is a cross-sectional view showing the configuration of the housing-type pipe joint according to the present embodiment. FIG. 3 is a cross-sectional view showing a deformation mode of the gasket when the pressure in the pipe according to the present embodiment changes. FIG. 4 is a cross-sectional view showing a configuration of a conventional housing-type pipe joint. FIG. 5 is a cross-sectional view showing a deformation mode of the gasket when the pressure in the pipe in the conventional housing-type pipe joint is changed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing type pipe joint 10 Housing 20 Gasket 20a Inner overhanging part 20b Outer overhanging part 50 Piping

Claims (1)

In housing-type pipe joints for connecting pipes,
A gasket made of an annular elastic body that is mounted on the outer peripheral surfaces of both connection ends across both of the two pipes that are faced to each other, and is substantially U-shaped with the inner side being an open end in a cross section orthogonal to the circumferential direction. In addition, a gasket in which an inner projecting portion projecting inward and an outer projecting portion projecting outward are formed at both ends contacting the outer peripheral surfaces of the two pipes, and
An annular housing arranged to cover the gasket while pressing the gasket against the pipe;
A housing-type pipe joint comprising:

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