JP2007100847A - Packing and joint-steel pipe connection mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein a nut, when used in the condition of being not sufficiently fastened to a joint, is suddenly disconnected from the joint to cause the spout of fluid such as water flowing in a steel pipe or cause the contamination of the internal of a building with the buildup of drop-by-drop leaking water. <P>SOLUTION: This pentagonally annular packing has a cross section consisting of two end faces, an outer peripheral face, an inner peripheral face, and an oblique face connecting the end of the inner peripheral face to the end of one end face. Compressive and shrinkable protrusions are formed on the outer peripheral face and the other end face, or compressive and shrinkable grooves are formed in the outer peripheral face and the other end face. This joint-steel pipe connection mechanism uses the packing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a packing that can easily find forgetting to tighten a nut that connects a joint and a steel pipe connected to the joint, and a joint-to-steel pipe connecting mechanism using the packing.

  Since many pipes such as water pipes of buildings are stretched on each floor of the building, there are many connections between these pipes during construction. Such a connection between the pipes is performed by, for example, a connection mechanism as disclosed in Patent Document 1. That is, in FIG. 15, the end of one steel pipe 1 and one end of the joint 2 are connected via the packing 4 with the nut 3 and are not shown in FIG. 15, but are connected to the other end of the joint 2. Another steel pipe is connected in the same manner, and the piping network of the steel pipe 1 is stretched around by such a connection mechanism.

The joint 2 includes a tapered portion 6a that abuts one inclined surface 5a of a mountain-shaped protrusion 5 having two inclined surfaces 5a and 5b formed on the outer periphery of the end portion of the steel pipe 1, and a first fitting portion 6b for packing. A notch 6 is provided. The nut 3 forms a second notch 3a that is in close contact with the other inclined surface 5b of the mountain-shaped protrusion 5, and the joint 2 of the joint 2 is secured when the female thread 3b of the nut 3 and the male thread 2a of the joint 2 are screwed together. It has the joint contact surface 3c which an end surface contacts. As shown in FIGS. 16 and 17, the packing 4 has an annular shape having a polygonal cross section, and the steel pipe 1 when the female thread portion 3 b of the nut 3 and the male thread 2 a of the joint 2 are screwed together. So as to be in close contact with the inclined surface 4a that contacts the other inclined surface 5a of the chevron-shaped protrusion 5 formed on the nut, the nut-side end surface 4b that contacts the joint contact surface 3c of the nut 3, and the packing fitting portion 6b of the joint 2. The outer peripheral surface 4c and the joint side end surface 4d are formed.
Gazette

  According to the above-described prior art, even if the female screw 3b of the nut 3 is not sufficiently tightened with respect to the male screw 2a of the joint 2 by temporary fastening by hand tightening with weak tightening force, it is discriminated from the outside. This is often difficult to overlook when completing construction work. In addition, although the packing 4 is in contact with the joint 2 and the inclined surface 5a of the steel pipe 1 at the stage of manual tightening, the pressure water is experimentally poured after completion of the piping work to check for water leakage. As a result, it is often overlooked. For this reason, when the nut 3 is started to be used without being sufficiently tightened with respect to the joint 2, the connection between the nut 3 and the joint 2 is suddenly disconnected and water flowing in the steel pipe 1 or the like. There is a problem that the fluid is ejected or the inside of the building is soiled due to little water leakage.

  The present invention has been made in order to solve the above-mentioned problems. In the invention of the first aspect, the cross section has two end surfaces, an outer peripheral surface, an inner peripheral surface and an end of the inner peripheral surface. In the pentagonal ring-shaped packing composed of the slope connecting the end of one end surface, a compression-reducing projection is formed on the outer peripheral surface and the other end surface.

  In the invention of claim 2, in a pentagonal annular packing having a cross section having two end faces, an outer peripheral face, an inner peripheral face, and an end face of the inner peripheral face and an end face of one end face, the outer peripheral face and The other feature is that a packing characterized by forming a compressible / reducible groove on the other end face is formed.

  According to a third aspect of the present invention, in the pentagonal annular packing having a cross section having two end surfaces, an outer peripheral surface, an inner peripheral surface, and a slope connecting the end of the inner peripheral surface and the end of one end surface, the inner peripheral surface And a packing characterized in that a projection capable of being compressed and reduced is formed on the inclined surface.

  According to a fourth aspect of the present invention, there is provided a pentagonal annular packing having a cross section having two end surfaces, an outer peripheral surface, an inner peripheral surface, and a slope connecting the end of the inner peripheral surface and the end of one end surface. And a packing characterized in that a groove capable of being compressed and reduced is formed on the slope.

In the invention according to claim 5, the joint and the steel pipe, which are connected by tightening the joint and the steel pipe formed with a chevron at the end until the nut and the joint come into contact with each other through the packing of claim 1 In the connection mechanism,
In the packing according to claim 1, the outer peripheral surface and one end surface of the joint formed with a protrusion capable of compressing and reducing are in close contact with each other, and the one inclined surface, the inner peripheral surface and the inclined surface of the chevron protrusion of the steel pipe are in close contact with each other. There is.

In the invention of claim 6, the joint and the steel pipe, which are connected by tightening the joint and the steel pipe having an angle projection at the end until the nut and the joint come into contact with each other through the packing of the claim 2, are connected. In the connection mechanism,
The packing according to claim 3 is in close contact with the joint and the outer peripheral surface and one end surface of the compression-reducing groove, and the one inclined surface, the inner peripheral surface and the inclined surface of the chevron projection of the steel pipe are in close contact. There is.

In the invention of claim 7, the joint and the steel pipe, which are connected by tightening the joint and the steel pipe formed with the angle projection at the end until the nut and the joint come into contact with each other through the packing of claim 3 In the connection mechanism,
The packing according to the third aspect is that the chevron-shaped projections of the steel pipe and the inner peripheral surface and the inclined surface on which the compression-reducing projections are formed are in close contact with each other.

In the invention of claim 8, the joint and the steel pipe, which are connected by tightening the joint and the steel pipe formed with a chevron at the end until the nut and the joint come into contact with each other through the packing of claim 4 In the connection mechanism,
In the packing according to the fourth aspect, the chevron-shaped projections of the steel pipe and the inner peripheral surface and the inclined surface in which the compressible / reducible groove is formed are in close contact with each other.

  According to the packing of claim 1, since the compression-reducing projection is formed on the outer peripheral surface of the annular packing having a pentagonal cross section and the other end surface, there is a gap between the surface of the joint abutted by this projection. Arise. This gap is effective at the stage of temporary fastening such as hand tightening because the projections are not compressed and reduced with a weak tightening force, and the fluid flowing in the steel pipe leaks outside through this gap. It turns out that it is not tightened sufficiently and can prevent inspection mistakes. And at this time, by tightly tightening the nut with a tool, the packing is compressed along the inclined surface in the diametrical direction and the centerline axis direction of the steel pipe. It becomes a state. The packing according to claim 1 can be effectively used in the connection mechanism between the steel pipe and the joint as described above.

  According to the invention of claim 2, when a groove is formed in place of the projection of the claim 1 and this groove is hand-tightened, the fluid is not compressed and reduced, and the nut is strongly tightened using a tool. Compresses and shrinks and crushes the groove to prevent fluid leakage, resulting in normal use.

  According to the invention of claim 3, since the compression-reducing projection is formed on the inner circumferential surface and the inclined surface of the annular packing having a pentagonal cross section, a gap is generated between the inclined surfaces of the steel pipe abutted by the projection. . This gap is not compressed and reduced by a weak force such as hand tightening as in the case of claim 1 and is compressed and reduced by a strong force using a tool, so that an inspection error can be prevented and a normal use state can be maintained. . The packing according to claim 3 can be effectively used in the connection mechanism between the steel pipe and the joint as described above.

  According to the invention of claim 4, when a groove is formed in place of the protrusion of the claim 3 and this groove is hand-tightened, the fluid is not compressed and reduced, and the nut is strongly tightened using a tool. Compresses and shrinks and crushes the groove to prevent fluid leakage, resulting in normal use.

  The connection mechanism between the steel pipe and the joint according to claim 5 is advantageous in that the connection mechanism between the steel pipe and the joint described in the above-mentioned packing portion according to claim 1 can be obtained.

  The connection mechanism between the steel pipe and the joint according to claim 6 is advantageous in that the connection mechanism between the steel pipe and the joint described in the above-described packing portion according to claim 2 can be obtained.

  The connection mechanism between the steel pipe and the joint according to the seventh aspect has an advantage that the connection mechanism between the steel pipe and the joint described in the above-described packing portion according to the third aspect can be obtained.

  The connection mechanism between the steel pipe and the joint according to the eighth aspect has an advantage that the connection mechanism between the steel pipe and the joint described in the packing part according to the fourth aspect can be obtained.

The best embodiment of the present invention will be described below with reference to the drawings. About the same structural member as a prior art example, the same code | symbol is attached | subjected and description is abbreviate | omitted.
FIGS. 1 to 5 show a first embodiment of a connection mechanism between a steel pipe 1 and a joint 2 according to the present invention. FIG. 1 shows a state in which one side (left side in the figure) of the joint 2 is tightened and the other side (right side in the figure). ) Indicates the state of hand tightening. 2 to 5 show a compressible and compressible packing 4 made of a resilient member such as rubber used in the first embodiment. The packing 4 has an annular cross section and has two nut side end surfaces 4b, a joint side end surface 4d, an outer peripheral surface 4c, an inner peripheral surface 4e, an end of the inner peripheral surface 4e, and a nut side end surface. It consists of a slope 4a connecting the ends of 4b. And the protrusion 7 is formed in the outer peripheral surface 4c and the joint side end surface 4d. In this embodiment, four protrusions 7 are formed at intervals of 90 °, but the present invention is not limited to this, and a plurality of protrusions 7 may be provided. Further, instead of the protrusion 7 protruding like a rod in the direction of the central axis of the packing 4, as shown in FIG. 11, a plurality of small protrusions 8 are formed on the outer peripheral surface 4c and the joint side end surface 4d. It may be what has been done. The protrusion height and the cross-sectional shape of the protrusion 7 or the small protrusion 8 are not particularly limited, but when the nut 3 is tightened with a tool and compressed and reduced, the protrusion 7 or the small protrusion 8 is crushed or depressed. It has hardness and elasticity, and has hardness and elasticity that do not easily deform when hand-tightened.

FIG. 13 shows still another embodiment of the packing 4 in which a groove 9 is formed in place of the protrusion 7 of the first embodiment shown in FIGS. The groove 9 is formed continuously on the outer peripheral surface 4c of the packing 4 and the joint side end surface 4d so as to come out from the joint side end surface 4d to the nut side end surface 4b. It flows out from 4d to the nut side end surface 4b. The number of grooves 9 is not particularly limited.
The cross-sectional shape of the depth and width of the groove 9 is not particularly limited. However, the groove 9 has such hardness and elasticity that the groove 9 is crushed when the nut 3 is tightened with a tool and compressed and reduced. In addition, it is of such a degree that it is not easily deformed when hand-tightened.

  In order to form a connection mechanism between the steel pipe 1 and the joint 2 using such a packing 4, first, the packing 4 is fitted into a packing fitting portion 6 b formed on the inner periphery of the end of the joint 2 in advance. The protrusions 7 or grooves 9 formed on the outer peripheral surface 4c and the joint side end surface 4d are brought into contact with each other. After this preparation is completed, as shown in FIG. 1, together with the joint 2, the inclined surface 4 a of the packing 4 is brought into contact with the inclined surface 5 a on the end side of the mountain-shaped protrusion 5 formed at the end of the steel pipe 1. insert. Then, the female thread 3b of the nut 3 and the male thread 2a of the joint 2 are screwed together after the other inclined surface 5b of the angled protrusion 5b of the steel pipe 1 is in contact with the second inclined surface 5b, and then hand-tightened. To do. As a result, a temporarily fixed connection state as shown on the right side of FIG. 1 is obtained. In this way, the steel pipe 1 and the joint 2 are temporarily tightened one after another, and then the nut 3 is further tightened with respect to the joint 2 using a tool to complete the state on the left side of FIG.

  At this time, if there is a portion as shown on the right side of FIG. 1 that is not tightened with a tool in a hand-tightened state, the packing 4 formed by the protrusion 7 and the packing fitting portion 6b of the joint 2 are provided. Since the fluid flowing in the steel pipe 1 leaks through the gap S formed between them or the groove 9 (not shown), the untightened state can be easily determined.

  When the joint 2 and the nut 3 are completely tightened with a tool with a strong force, the packing 4 is compressed and reduced by the tightening of the nut 3 as shown in the left side of FIG. S is closed, or although not shown, the groove 9 is also closed, and the connection between the steel pipe 1 and the joint 2 is completed in a close contact state.

  Next, based on FIG. 6 thru | or FIG. 10, 2nd Example of the connection mechanism of the steel pipe 1 of this invention and the coupling 2 is shown. FIG. 6 shows a state in which one side (left side in the figure) of the joint 2 is tightened, and the other side (right side in the figure) is hand-tightened. FIG. 7 to FIG. 10 show the compressible / shrinkable packing 4 made of a resilient member such as rubber used in the second embodiment. This packing 4 is different from the packing 4 of the first embodiment in that the formation positions of the protrusions 7 are the inner peripheral surface 4e and the inclined surface 4a of the packing 4. The other configuration is the same. Also in this embodiment, four protrusions 7 are formed at intervals of 90 °, but the present invention is not limited to this, and a plurality of protrusions 7 may be provided. Further, instead of the protrusion 7 protruding in a bar shape in the central axis direction of the packing 4, as shown in FIG. It may be. Others are the same as those of the packing 4 of the first embodiment, and the description thereof is omitted.

FIG. 14 shows still another embodiment of the packing 4 in which a groove 9 is formed instead of the projection 7 of the second embodiment shown in FIGS. The groove 9 is formed continuously on the inner peripheral surface 4e and the inclined surface 4a of the packing 4 so as to pass from the joint side end surface 4d to the nut side end surface 4b, so that the fluid passes through the groove 9 and the joint side end surface 4d. To the nut side end face 4b. The number of grooves 9 is not particularly limited. or,
The cross-sectional shape of the depth and width of the groove 9 is not particularly limited. However, the groove 9 has hardness and elasticity enough to be crushed when the nut 3 is tightened with a tool and compressed and reduced. In addition, it is the same as the above-described embodiment that it is not easily deformed when hand-tightened.

The procedure for forming the connection mechanism between the steel pipe 1 and the joint 2 using such a packing 4 will be described. Similarly to the above, the packing 4 is fitted into the packing fitting portion 6b of the joint 2, and the outer peripheral surface 4c and the joint side are fitted. The end face 4b is brought into contact. After this preparation is completed, as shown in FIG. 6, the protrusion 7 or groove formed on the inclined surface 4 a of the packing 4 on the inclined surface 5 a on the end side of the mountain-shaped protrusion 5 formed on the end of the steel pipe 1. 9 and the projection 7 or the groove 9 formed on the inner peripheral surface 4e is inserted together with the joint 2 so as to contact the end portion outer peripheral surface of the steel pipe 1, and then the female screw 3b of the nut 3 is After screwing into the male screw 2a of the joint 2, it is hand-tightened.
As a result, a temporarily fixed connection state as shown on the right side of FIG. 6 is obtained. In this way, the steel pipe 1 and the joint 2 are temporarily tightened one after another, and then the nut 3 is further tightened with respect to the joint 2 using a tool to complete the state on the left side of FIG.

  At this time, if there is a portion as shown on the right side of FIG. 6 that is not tightened with a tool in the hand-tightened state, the packing 4 formed by the protrusion 7 and the inclined surface 5a of the steel pipe 1 are present. Since the fluid flowing through the steel pipe 1 through the gap S or the groove 9 formed between the outer peripheral surfaces leaks out, the untightened state can be easily determined.

  When the joint 2 and the nut 3 are completely tightened with a strong force with a tool, the packing 4 is compressed and reduced by tightening the nut 3 as shown on the left side of FIG. S is closed, and the groove 9 is crushed and closed, and the connection between the steel pipe 1 and the joint 2 is completed in a close contact state.

  In addition, in the above description, although the case where the steel pipe 1 and the steel pipe 1 were connected via the joint 2 was demonstrated, it is the same also when connecting other members, such as the steel pipe 1 and an elbow. The type of the steel pipe 1 is not particularly limited, but a thin stainless steel pipe is particularly suitable because it is necessary to form a chevron 5 at the end of the steel pipe 1.

  It is particularly effective for indoor pipes such as water pipes, but is also useful for joining pipes for gases and other fluids.

The figure of the manual fastening and tool fastening of the connection mechanism of the steel pipe and joint of 1st Example of this invention. The perspective view of the packing of 1st Example. The front view. FIG. FIG. The figure corresponding to FIG. 1 of 2nd Example of this invention. The perspective view of the packing of 2nd Example. The front view. FIG. FIG. The perspective view of the other packing of 1st Example. The perspective view of the other packing of 2nd Example. The perspective view of the other packing of 1st Example. The perspective view of the other packing of 2nd Example. The figure of the manual fastening and tool fastening of the connection mechanism of the conventional steel pipe and joint. The perspective view of the conventional packing. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Joint 3 Nut 3a 2nd notch 3b Female thread 3c Joint contact part 4 Packing 4a Slope 4b Nut side end surface 4c Outer peripheral surface 4d Joint side end surface 4e Inner peripheral surface 5 Angle protrusion 6 First notch 6b Packing fitting Part 7 Protrusion 8 Small protrusion 9 Groove

Claims (8)

  In a pentagonal annular packing having a cross section of two end surfaces, an outer peripheral surface, an inner peripheral surface, and an inclined surface connecting the end of the inner peripheral surface and the end of one end surface, the outer peripheral surface and the other end surface can be compressed and reduced. A packing characterized by forming protrusions.   In a pentagonal annular packing having a cross section of two end surfaces, an outer peripheral surface, an inner peripheral surface, and an inclined surface connecting the end of the inner peripheral surface and the end of one end surface, the outer peripheral surface and the other end surface can be compressed and reduced. A packing characterized by forming a groove.   In a pentagonal annular packing comprising two end surfaces, an outer peripheral surface, an inner peripheral surface and an end surface of the inner peripheral surface and one end surface, a protrusion that can be compressed and reduced on the inner peripheral surface and the inclined surface Packing characterized by forming. In a pentagonal annular packing composed of two end faces, an outer peripheral face, an inner peripheral face, and an end face of the inner peripheral face and one end face, a groove capable of being compressed and reduced on the inner peripheral face and the inclined face Packing characterized by forming. In the connection mechanism between the joint and the steel pipe, which is connected by tightening the joint and the steel pipe formed with the chevron at the end until the nut and the joint come into contact with each other through the packing according to claim 1.
In the packing according to claim 1, the outer peripheral surface and one end surface of the joint formed with a protrusion capable of compressing and reducing are in close contact with each other, and the one inclined surface, the inner peripheral surface and the inclined surface of the chevron protrusion of the steel pipe are in close contact with each other. A connection mechanism between a joint and a steel pipe. In the connection mechanism between the joint and the steel pipe, the joint and the steel pipe formed with a chevron at the end are tightened and connected until the nut and the joint come into contact with each other through the packing according to claim 2.
In the packing according to claim 2, the outer peripheral surface and one end surface of the joint formed with a groove capable of compressing and shrinking are in close contact with each other, and the one inclined surface, the inner peripheral surface and the inclined surface of the chevron projection of the steel pipe are in close contact with each other. A connection mechanism between a joint and a steel pipe. In the connection mechanism between the joint and the steel pipe, the joint and the steel pipe formed with a chevron at the end are tightened and connected until the nut and the joint come into contact with each other through the packing according to claim 3.
The joint according to claim 3, wherein the chevron-shaped projection of the steel pipe and the inner peripheral surface and the inclined surface on which the compression-reducing projection is formed are in close contact with each other. In the connection mechanism between the joint and the steel pipe, the joint and the steel pipe formed with a chevron at the end are tightened and connected with the nut until the nut and the joint come into contact with each other through the packing according to claim 4.
5. The joint-steel pipe connection mechanism according to claim 4, wherein the chevron of the steel pipe is in close contact with the inner peripheral surface and the inclined surface in which a compressible / reducible groove is formed.

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