JP2005054857A - Structure for preventing fall of gasket for pipe fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent fall of a gasket for a pipe fitting pinched between a male and a female fitting members. <P>SOLUTION: In this structure for preventing fall of the gasket, a fall preventing ring having high rigidity is used for the pipe fitting which pinches the gasket between the male and the female fitting members by inserting one end of the male fitting member into the female joint member through the elastic gasket and maintaining insert with a lock means. The fall preventing ring has a fall stopper part projecting in the pass-through direction from the inner peripheral edge of a ring main body, and the ring main body is pinched between the female fitting member and the gasket to arrange the fall stopper part along the inside surface of the gasket. The fall stopper ring is concentrically built in a cross section of the gasket. The fall stopper ring is held between the male and the female fitting members along the inside surface of the gasket. The fall preventing ring is fitted to the gasket by arranging the fall stopper part along the inside surface of the gasket, and pinching a surface and a back surface of the inner peripheral edge of the gasket with a pair of flanges. Instead of using the fall preventing ring, the gasket and the pinching surfaces can be formed with projecting and recessed parts. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure for preventing a gasket sandwiched between male and female joint members constituting a pipe joint from being detached.

The pipe joint is composed of a pair of male and female joint members that are respectively attached to ends of two pipes. Then, the end portions of the gasket and the male joint member are inserted into the female joint member, and the female and male joint members are provided so as to be connectable and disengageable by a locking means including a cam arm, and the gasket is sandwiched between the male and female joint members (for example, Patent Document 1).
Japanese Patent No. 2642897

  However, for example, in a piping system that transports a fluid with high viscosity, if the pressure in the pipe line becomes negative, the gasket may be deformed and sucked together with the fluid, resulting in failure of the machine at the end of the piping line. is there. This is probably because the gasket is deformed and has a flat ring shape. In other words, if a force to pull out from the inside is applied to the sandwiched gasket and the pulling force becomes larger than the sandwiching force, the flat gasket will be pulled out (sucked) inside without being caught. .

  The present invention has been developed in view of the above circumstances, and an object of the present invention is to prevent the gasket from coming off.

  The present invention inserts one end of a male joint member into a female joint member via a gasket made of an elastic material, and connects the male and male joint members with a locking means to maintain the insertion state, and between the male and male joint members This applies to pipe joints that hold

  The inventions of claims 1 to 4 use drop-off prevention rings having higher rigidity than the gasket, and have different shapes and attachment methods.

  According to the first aspect of the present invention, the drop-off prevention ring projects from the inner peripheral edge of the flat circular ring body in the penetrating direction, and the ring body of the drop-off prevention ring is interposed between the female joint member and the gasket. Or the male joint member is sandwiched between the gasket and the retaining portion is arranged along the inner surface of the gasket.

  For the drop-off prevention ring, it is necessary to make the ring main body circular in order to secure a seal over the entire circumference of the gasket, but the retaining portion is not limited to a cylindrical shape. That is, if the retaining portion is provided on at least a part of the entire inner peripheral edge of the ring body, the retaining effect can be exhibited. For the following inventions, those not limited in shape mean the same thing.

  In the invention of claim 2, the drop-off prevention ring is concentrically built in the cross section of the gasket, and as the built-in means, either a means for inserting the drop-off prevention ring from an annular slit formed along the inner surface of the gasket, or a drop-off prevention A means for integrally forming the ring with the gasket is used.

  The slit is formed along the inner surface of the gasket because, for example, if the slit is formed along the outer periphery of the gasket, it is not possible to prevent the gasket from being pulled out even if a drop prevention ring is built in. It is.

  In the invention of claim 3, the shape of the drop-off prevention ring is such that the inner diameter side of the gasket is covered in a C shape or a circular shape, and a second receiving space is provided inside the gasket receiving space between the male and female joint members. The drop prevention ring is formed along the inner surface of the gasket by forming and accommodating the drop prevention ring in the second accommodation space. Since the drop-off prevention ring is attached by being accommodated in the second accommodation space, there is no possibility that it will come off during use. Further, the inner diameter side of the gasket does not necessarily cover the entire circumference in a circular shape, but if it is covered at least in a C shape, the shape of the drop-off prevention ring is retained by its rigidity. There is no risk that the gasket located will come off during use.

  According to a fourth aspect of the present invention, the drop-off prevention ring comprises a retaining portion that extends along the inner surface of the gasket, and a pair of flanges that project outward from both sides in the axial direction of the retaining portion, and is more than the inner peripheral edge portion of the gasket. The outer side is sandwiched between male and female joint members to ensure a seal, and the fall prevention ring is attached to the gasket inner surface by sandwiching the front and back surfaces of the inner peripheral edge of the gasket between a pair of flanges. It is characterized by being along. That is, the drop-off prevention ring is attached by a pair of flanges. The gasket is prevented from being pulled out by the retaining portion.

  The invention of claim 5 and below prevents the gasket from coming off without using the drop-off prevention ring. The invention of claim 5 is characterized in that a protrusion is provided on at least one clamping surface of the male and female joint members, and the protrusion is bitten into the gasket. The gasket may be formed in advance with a groove for biting the protrusion, or the groove may be formed in the gasket as a result using the clamping force of the locking means.

  The invention of claim 6 is characterized in that a convex portion is provided on at least one of the front and back surfaces of the gasket, and a concave portion for accommodating the convex portion is provided in one direction of the male and female joint members with reference to the gasket. To do.

  Providing the convex part in one direction of the male and female joint members with reference to the gasket means that the concave part is provided on the male joint member or the holding surface of the female joint member, or the female joint member covers the outside of the male joint member It is a concept including a method of providing a recess between (insertion part).

  The invention according to claim 7 is characterized in that the stopper piece protrudes in the axial direction from the inner peripheral portion of the male joint member, and the stopper piece extends along the inner surface of the gasket.

  According to the first to fourth aspects of the present invention, it is possible to prevent the gasket from being deformed, and hence the gasket from being pulled out to the inside, by having a highly rigid drop-off preventing ring inside or in the cross section of the gasket.

  Further, according to the inventions of claims 5 to 7, the drop-off prevention ring can be prevented from being pulled out inward by the protrusion, the convex portion, the concave portion and the stopper piece.

  As shown in FIG. 1 and FIG. 9, the pipe joint that is the premise of the present invention comprises a male joint member 1 and a female joint member 2, and an annular gasket 3 and one end of the male joint member 1 inside the female joint member 2. And the male and female joint members 1 and 2 are provided so as to be connectable and disengageable by the locking means 4 provided on the female joint member 2.

  Each of the male and female joint members 1 and 2 is provided with means for connecting to the end portion of the pipe 5 at one end portion, and specifically, a female screw 6 is used. The male joint member 1 has an end surface to be inserted as a clamping surface 7 and has a recess 8 having an arcuate cross section along the outer periphery of the end portion in the same direction. In addition, the female joint member 2 has a clamping surface 9 on the inner side of the inserted end portion, and a cam insertion hole 10 is formed at a location corresponding to the recess 8 so as to face the diameter direction. The gasket 3 is elastically deformed, for example, rubber.

  The locking means 4 supports a pair of cam arms 11 and 11 so as to be swingable with respect to the female joint member 2. The structure that supports each cam arm 11 in a swingable manner is such that a pair of ears 12, 12 project opposite to the cam insertion hole 10 on both sides in the outer circumferential direction, and the cam portion 13 of the cam arm 11 is inserted between both ears. In this structure, a pin 15 serving as a fulcrum is passed through a hole 14 formed in both ears and the cam portion. When the arm portion 16 of the cam arm 11 is in a state along the axial direction of the pipe joint, the cam portion 13 enters deeply in a state where the recess 8 is pushed in, and the connection between the male and female joint members 1 and 2 is maintained. Then, the end face of the male joint member 1 and the inwardly projecting seating surface of the female joint member 2 are opposed to each other as a sandwiching surface, and the gasket 3 is sandwiched between the pair of sandwiching surfaces 7 and 9. As a result, the seal is secured. On the other hand, when the arm portion 16 of the cam arm is swung in a direction in which the tip portion is separated from the female joint member 2, the cam portion 13 is separated from the recess 8 and the connection is released.

  As shown in FIGS. 1 to 5, the pipe joint gasket drop prevention structure according to the present invention includes a type using a drop prevention ring 17 having a rigidity higher than that of the gasket 3 (first to ninth embodiments), and FIGS. As shown in FIG. 8, it is roughly divided into types that do not use a drop-off prevention ring (tenth to fourteenth embodiments).

  The type using the drop-off prevention ring 17 can use an existing pipe joint as it is. As shown in FIGS. 1, 9, and 10, the first embodiment is characterized in two points: the shape of the drop-off prevention ring 17 and the use of a force for sandwiching the gasket 3. The drop-off prevention ring 17 projects the retaining portion 19 from the inner peripheral edge of the flat circular ring body 18 in the penetrating direction, and specifically has an L-shaped longitudinal section. The ring body 18 of the drop-off prevention ring is secured between the female joint member 2 and the gasket 3, and a seal is secured, and the retaining portion 19 is placed along the inner surface of the gasket 3, so that the gasket 3 is brought inward. It is prevented from being pulled out. The drop-off prevention ring 17 is made of metal or hard resin, and is manufactured by a spatula drawing or the like.

  As shown in FIG. 2 (a), the second embodiment of the type using the drop-off prevention ring is provided with a folded portion 20 bent toward the gasket 3 on the outer peripheral edge portion of the ring body 18 of the drop-off prevention ring. The part 20 is bitten into the gasket 3 to enhance the drop-off preventing effect.

  As shown in FIG. 2 (b), the third embodiment of the type using a drop-off prevention ring has a folded portion 20 as in the second embodiment. The folded portion 20 is sharpened and the folded position is set to the ring. It is characterized by being inside the outer peripheral edge of the main body 18.

  As shown in FIG. 2 (c), the fourth embodiment of the type using a drop-off prevention ring has the shape of the drop-off prevention ring 17 basically the same as that of the first embodiment, but the outer diameter of the ring body 18 is increased. A stepped portion 30 for accommodating the ring body 18 is formed on the inner peripheral portion of the back surface of the gasket 3, and the outer peripheral portion of the back surface of the gasket 3 is brought into close contact with the sandwiching surface 9 of the female joint member 2 by the clamping force, It is characterized by enhanced sex.

  As shown in FIG. 2 (d), the fifth embodiment of the type using a drop-off prevention ring uses not only the drop-off prevention ring but also an annular lining 21 made of an elastic material, and the lining 21 covers the front and back surfaces of the ring body 18. Folded and covered, a four-layer structure between the holding surfaces 7 and 9 between the male and female joint members, that is, a structure in which the lining 21, the fall-off prevention ring 17, the lining 21 and the gasket 3 are sequentially stacked, and has high rigidity. It is characterized in that the objects (female joint member 2 and drop-off prevention ring 17) are prevented from coming into contact with each other and the sealing performance is improved. In the drawings, for the sake of clarity, the lining 21 is shown thicker than the actual one, and the drop-off prevention ring 17 and the gasket 3 are shown thinner for the sake of convenience. Moreover, although not shown in figure, it is good also as a structure which laminated | stacked the lining 21, the fall-off prevention ring 17, and the gasket 3 in order between the both clamping surfaces 7 and 9 of male and female joint members. It is desirable that the lining 21 is bonded to the drop-off prevention ring 17 in order to improve unity and prevent the lining 21 from coming off.

  As shown in FIG. 2E, the sixth embodiment of the type using a drop-off prevention ring is formed by cutting the slit 22 in the radial direction along the intermediate portion of the inner surface of the gasket 3 in the radial direction. The ring main body 18 of the drop-off prevention ring is inserted, the ring main body 18 is concentrically built in the cross section of the gasket 3, and the retaining portion 19 is arranged along the inner surface of the gasket 3. In this case, the ring body 18 serves not only to attach (position) the drop-off prevention ring 17 but also to prevent the gasket 3 from coming off. Accordingly, a retaining effect can be obtained from both the ring body 18 and the retaining portion 19.

  As shown in FIG. 2 (f), the seventh embodiment of the type using the drop-off prevention ring is different from the sixth embodiment in the shape of the drop-off prevention ring 17 and is not provided with the retaining portion 19; A feature of the shape is that the longitudinal section is circular. Another feature is that a drop prevention ring 17 is inserted into the back of the slit 22 and the drop prevention ring 17 is built in the cross section of the gasket 3. FIG. 3 shows a modification of the seventh embodiment, in which a drop-off prevention ring 17 is built in the cross section of the gasket 3 by integral molding.

  As shown in FIGS. 4A, 4B and 4C, the eighth embodiment of the type using a drop-off prevention ring is characterized by the shape of the drop-off prevention ring 17 and how to attach it. The drop-off prevention ring 17 is formed in a shape that covers the inner diameter side of the gasket 3 in a C shape (FIG. 4B) or a circular shape (FIG. 4C). Further, the outer peripheral portion between the sandwiching surfaces 7 and 9 of the male and female joint members is the gasket housing space 23, and the inner circumferential portion between the sandwiching surfaces is the second housing space 24, and the drop prevention ring 17 is provided in the second housing space 24. And a drop prevention ring 17 is provided along the inner surface of the gasket 3. The fall prevention ring 17 is held in the second accommodation space 24 to prevent the gasket 3 from being detached.

  As shown in FIG. 5, the ninth embodiment of the type using a drop-off prevention ring is characterized in the shape of the drop-off prevention ring 17 and how to attach it. The drop-off prevention ring 17 has a U-shaped longitudinal section, and includes a retaining portion 19 that extends along the inner surface of the gasket 3 and a pair of flanges 25 and 25 that project outward from both sides in the axial direction of the retaining portion 19. Become. Then, the outer side of the inner peripheral edge of the gasket 3 is sandwiched between male and female joint members to ensure a seal, and the inner peripheral edge of the gasket 3 is projected to the inner side of the both clamping surfaces 7 and 9, Further, the falling prevention ring 17 is attached to the gasket 3 by sandwiching the inner peripheral edge portion between the pair of flanges 25, 25, and the retaining portion 19 is arranged along the inner surface of the gasket 3.

  In the tenth embodiment that does not use a drop-off prevention ring, as shown in FIG. 6 (a), sharp projections 26 are provided concentrically on the clamping surface 7 of the male joint member 1, and the projections 26 are bitten into the gasket 3. It is characterized by that. The protrusion 26 performs the same function as the folded portion 20 described above.

  As shown in FIG. 6B, the eleventh embodiment of the type that does not use a drop-off prevention ring is characterized in that a plurality of protrusions 26 are provided concentrically on the holding surface 9 of the female joint member 2.

  As shown in FIG. 7 (a), the twelfth embodiment of the type that does not use a drop-off prevention ring is provided with a convex portion 27 on the outer peripheral portion of the surface of the gasket 3, and the end portion of the male joint member 1 for insertion. And an end portion of the male joint member 1 covering the outer side of the male joint member 1 becomes a concave portion that accommodates the convex portion 27, and the convex portion 27 is caught by the male joint member 1. Make sure that the gasket is not pulled out.

  As shown in FIG. 7B, the thirteenth embodiment of the type that does not use a drop-off prevention ring is provided with a convex portion 27 on the outer peripheral portion of the back surface of the gasket 3, and the outer side of the clamping surface 9 of the female joint member 2. A concave portion 28 is formed on the surface.

  As shown in FIG. 8, in the fourteenth embodiment of the type that does not use a drop-off prevention ring, a concentric stopper piece 29 protrudes from the inner side of the end of the male joint member 1 in the axial direction, and the stopper piece 29 is formed on the inner surface of the gasket 3. It is characterized by being along.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view showing a first embodiment of a pipe joint dropout prevention structure of the present invention. (A), (B), (C), (D), (E), and (F) are cross-sectional views of main parts showing second to seventh embodiments of the pipe joint drop-off preventing structure of the present invention. It is principal part sectional drawing which shows the modification of 7th embodiment of the drop-off prevention structure of a pipe joint. (A), (B), and (C) are a cross-sectional view of a main part and a plan view of a drop-off prevention ring showing an eighth embodiment of the pipe joint drop-off prevention structure of the present invention. It is principal part sectional drawing which shows 9th embodiment of the drop-off prevention structure of the pipe joint of this invention. (A) and (B) are cross-sectional views of main parts showing the tenth and eleventh embodiments of the pipe joint drop-off preventing structure of the present invention. (A) and (B) are cross-sectional views showing the main parts of the twelfth and thirteenth embodiments of the pipe joint drop-off preventing structure of the present invention. It is principal part sectional drawing which shows 14th embodiment of the drop-off prevention structure of the pipe joint of this invention. It is an exploded view of the first embodiment of the pipe joint drop-off preventing structure of the present invention. It is a top view of the drop-off prevention ring for the first embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Male joint member 2 Female joint member 3 Gasket 4 Locking means 7, 9 Holding surface 17 Fall-off prevention ring 18 Ring body 19 Retaining part 22 Slit 23 Gasket accommodation space 24 Second accommodation space 25 Flange 26 Projection 27 Protrusion 28 Concavity 29 Stopper piece

Claims (7)

One end of the male joint member (1) is inserted into the female joint member (2) through the gasket (3) of an elastic material, and the male and female joint members (1, 2) are connected by the locking means (4) and inserted. In the pipe joint that holds the gasket (3) between the male and female joint members,
Using the drop-off prevention ring (17),
The drop-off prevention ring (17) is higher in rigidity than the gasket (3) and protrudes from the inner peripheral edge of the flat circular ring body (18) in the penetrating direction (19).
The ring body (18) of the drop-off prevention ring is sandwiched between the female joint member (2) and the gasket (3), or between the male joint member (1) and the gasket (3), and the retaining portion (19) is secured. A gasket drop-off prevention structure for pipe joints characterized by being along the inner surface of the gasket (3). One end of the male joint member (1) is inserted into the female joint member (2) through the gasket (3) of an elastic material, and the male and female joint members (1, 2) are connected by the locking means (4) and inserted. In the pipe joint that holds the gasket (3) between the male and female joint members,
An annular slit formed along the inner surface of the gasket (3) as a built-in means by incorporating a drop-off prevention ring (17) having higher rigidity than the gasket (3) in a concentric manner in the cross section of the gasket (3). A gasket drop-off prevention structure for a pipe joint, characterized in that means for inserting the drop-off prevention ring (17) from (22) or means for integrally forming the drop-off prevention ring (17) together with the gasket (3) is used. One end of the male joint member (1) is inserted into the female joint member (2) through the gasket (3) of an elastic material, and the male and female joint members (1, 2) are connected by the locking means (4) and inserted. In the pipe joint that holds the gasket (3) between the male and female joint members,
A drop-off prevention ring (17) which is higher in rigidity than the gasket (3) and covers the inner diameter side of the gasket in a C-shape or a circular shape is used. A second storage space (24) is formed, and the drop-off prevention ring (17) is housed in the second storage space (24) so that the drop-off prevention ring (17) is aligned with the inner surface of the gasket (3). The gasket fitting prevention structure for pipe fittings. One end of the male joint member (1) is inserted into the female joint member (2) through the gasket (3) of an elastic material, and the male and female joint members (1, 2) are connected by the locking means (4) and inserted. In the pipe joint that holds the gasket (3) between the male and female joint members,
Using the drop-off prevention ring (17),
The fall-off prevention ring (17) is higher in rigidity than the gasket (3) and has a retaining portion (19) that extends along the inner surface of the gasket and a pair that protrudes outward from both sides in the axial direction of the retaining portion (19). The flanges (25, 25)
The outer side of the inner peripheral edge of the gasket (3) is sandwiched between male and female joint members (1, 2) to secure a seal, and the front and back surfaces of the inner peripheral edge of the gasket (3) are attached to a pair of flanges (25 25) is attached to the gasket (3) by sandwiching it between the gaskets (3), and the retaining portion (19) is arranged along the inner surface of the gasket (3) to prevent the gasket from falling off. . One end of the male joint member (1) is inserted into the female joint member (2) through the gasket (3) of an elastic material, and the male and female joint members (1, 2) are connected by the locking means (4) and inserted. In the pipe joint that holds the gasket (3) between the male and female joint members,
Protrusion (26) is provided on at least one clamping surface (7, 9) of the male and female joint members (1, 2), and the protrusion (26) is bitten into the gasket (3). Drop-off prevention structure. One end of the male joint member (1) is inserted into the female joint member (2) through the gasket (3) of an elastic material, and the male and female joint members (1, 2) are connected by the locking means (4) and inserted. In the pipe joint that holds the gasket (3) between the male and female joint members,
A convex part (27) is provided on at least one of the front and back surfaces of the gasket (3), and a concave part (28) for accommodating the convex part is provided in one direction among the male and female joint members with reference to the gasket. Features a gasket fitting prevention structure for pipe fittings. One end of the male joint member (1) is inserted into the female joint member (2) through the gasket (3) of an elastic material, and the male and female joint members (1, 2) are connected by the locking means (4) and inserted. In the pipe joint that holds the gasket (3) between the male and female joint members,
A pipe joint gasket drop-off prevention structure characterized in that the stopper piece (29) protrudes in the axial direction from the inner peripheral portion of the male joint member (1) and the stopper piece (29) is placed along the inner surface of the gasket (3).

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