JP5213636B2 - Seal device for joint and fluid joint having the same - Google Patents

Description

  The present invention relates to a sealing device used in a joint that obtains a sealing performance by plastic deformation of a gasket, and a fluid coupling including the sealing device.

  The fluid coupling includes first and second coupling members having fluid passages communicating with each other, and an annular gasket interposed between the butted end faces of both coupling members, and the gasket is plastically deformed. What obtains a sealing property is well known.

As such a fluid coupling, a joint for pipe connection (referred to as “pipe joint” in the present invention) as described in Patent Document 1 is generally used, but is disclosed in Patent Document 2. Those used in such fluid control devices (referred to as “block joints” in the present invention) are also increasing. Normally, a pipe joint seal device has a predetermined shape for the end surfaces of both joint members and has a gasket and a retainer as separate parts. A seal device for a block joint has an end surface shape for both joint members. It has a shape different from that of the pipe joint, and has a gasket, a retainer and a guide ring as separate parts.
Japanese Patent Laid-Open No. 11-6585 JP-A-11-280967

  In the above-described conventional fluid coupling, since the pipe joint and the block joint are used differently, the sealing device is also improved separately with a different configuration, and these sealing devices are shared. That was never considered.

  Seal components need to be stored for immediate use as repair parts. Conventionally, it is necessary to prepare separate parts for pipe joints and block joints. Therefore, it takes a lot of time for storage and management.

  The object of the present invention is to provide a joint for pipe joints and block joints, which have different sealing devices, by realizing the common use of these sealing devices and reducing the labor for storage and management of repair parts. An object of the present invention is to provide a sealing device and a fluid coupling including the same.

  The joint seal device according to the present invention is a seal device provided at a butt portion of the first and second joint members having fluid passages communicating with each other, and is interposed between the butt end surfaces of both joint members. An annular gasket and an annular retainer that holds the gasket and that is fitted into an annular retainer housing recess provided at both ends of each joint member. The outer peripheral surface of the gasket is disposed on the inner periphery of the retainer. The gasket is moved in one axial direction at the boundary between the large-diameter inner peripheral surface to be fitted, the small-diameter inner peripheral surface having a smaller diameter than the large-diameter inner peripheral surface, and the small-diameter inner peripheral surface and the large-diameter inner peripheral surface. A small-diameter elastic ring that prevents the gasket from moving in the other axial direction is fitted on the large-diameter inner peripheral surface of the retainer, and the retainer has an outer surface on the outer periphery of the retainer. It is characterized in that a large 径弾 of rings for holding the over Na to the joint member is fitted.

  This joint sealing device is used in an assembled state in which a retainer holds a gasket, and a small-diameter elastic ring and a large-diameter elastic ring are fitted to the retainer. This joint sealing device can be used for both pipe joints (using cap nuts or bolts as screw means) and block joints (using bolts as screw means). The abutting portions of the first and second joint members have the same shape, and the retainer holding the gasket can be attached to both the first and second joint members.

  The gasket is made of, for example, nickel alloy or stainless steel, and the retainer is made of, for example, stainless steel.

  The retainer is, for example, an integrated product composed of a thin part having an inner diameter corresponding to the outer diameter of the gasket and a thick part having an inner diameter smaller than the thin part and larger than the thin part. A boundary portion between the peripheral surface (large-diameter inner peripheral surface) and the thick-walled inner peripheral surface (small-diameter inner peripheral surface) is a stepped surface that prevents the gasket from moving in one axial direction. The gasket may be a cylindrical surface having both an inner diameter and an outer diameter that are not stepped. Preferably, the gasket is an integral part that includes a large-diameter portion and a small-diameter portion that has the same inner diameter as the large-diameter portion and a small outer diameter. The large diameter portion is fitted into the inner diameter of the thin portion of the retainer, and the small diameter portion is fitted into the inner diameter of the thick portion of the retainer.

  As the elastic ring, a C-shaped snap ring with a part of a metal circular ring cut off and a circular cross section can be used. However, the elastic ring is not limited to this. Various ring-shaped members having the following can be used.

  It is preferable that annular grooves for fitting large-diameter and small-diameter elastic rings are respectively formed on the large-diameter inner peripheral surface of the retainer and the outer periphery of the retainer. The annular groove on the large diameter inner peripheral surface of the retainer is formed so that the small diameter elastic ring can protrude radially inward from the large diameter inner peripheral surface of the retainer in order to ensure the movement prevention function of the gasket of the small diameter elastic ring. Is done. The annular groove on the outer periphery of the retainer has a shape that allows the large-diameter elastic ring to be accommodated in the groove when the retainer is attached to the joint member.

  The retainer has a large-diameter outer peripheral surface corresponding to the outer diameter of the retainer housing recess and a smaller-diameter outer peripheral surface smaller than this, and an annular groove is formed on the large-diameter outer peripheral surface, and a large-diameter is formed in the annular groove. An elastic ring is preferably fitted. In this case, when the joint is assembled, the thick part of the retainer is fitted into one of the joint members, and at this time, the large-diameter outer peripheral surface of the retainer is just fitted into the retainer housing recess of the joint member. Then, concentricity with each other is ensured, and then the other joint member is butted against one joint member so that the small-diameter outer peripheral surface of the retainer fits loosely into the retainer housing recess of this joint member. The radial shift between the joint members is corrected.

  Usually, when the screw means is tightened, the joint member is formed with, for example, a gasket pressing ring-shaped protrusion having an arcuate cross section that first contacts and deforms the gasket. Correspondingly, the gasket is, for example, provided with a circular passage in the center of a square or substantially square disk (a flat surface in which both sides of the gasket are perpendicular to the axial direction). It is not limited to. For example, an annular recess corresponding to the annular protrusion of the joint member may be formed on the gasket, or an annular protrusion may be provided on the gasket so that the butted end surface of the joint member is a flat surface.

  The screw means can have various configurations. For example, both of the joint members are formed by a cap nut formed in one of the first and second joint members and screwed to the thread of the joint member. The first and second joint members are both sleeves in which the male thread portion is not formed, and both joint members are coupled by the separate male thread member and cap nut. May be. Further, the joint members may be formed such that a bolt insertion hole is formed on one side and a female thread portion is formed on the other side, and the joint members may be coupled by a bolt.

  The fluid coupling provided with the above-described coupling sealing device is a fluid coupling including a pair of tubular coupling members, a cap nut as a screw means, and a sealing device. Retainer housing recess that is fitted with each end of the retainer is cylindrical, consisting of a flange extending radially outward from the vicinity of the end and a large-diameter cylindrical extending axially outward from the outer peripheral edge of the flange An annular ring portion for forming a retainer receiving recess formed between the butted end portion of the main body may be formed on each joint member.

  A conventional pipe joint provided with a pair of tubular joint members does not have a retainer housing recess, and the retainer has its inner peripheral surface (of the joint member holding portion) held on the outer periphery of the tubular joint member. ing. On the other hand, in the fluid coupling according to the present invention, a large-diameter cylindrical portion for forming the retainer housing recess is provided at the abutting end portion of each tubular joint member, and the retainer has the outer peripheral surface of the retainer of the tubular joint member. It is held on the outer peripheral surface of the storage recess. About a structure of a retainer, a gasket, a small diameter elastic ring, and a large diameter elastic ring, it is set as the same structure as said sealing apparatus. By configuring the fluid coupling (that is, the pipe joint) including the pair of tubular joint members in this manner, the pipe joint sealing device and the block joint sealing device can be made common.

  In addition, as a fluid coupling including the above-described coupling sealing device, a fluid coupling including a pair of coupling members, a bolt as a screw means, and the coupling sealing device according to claim 1 or 2, One of the joint members consists of a sleeve and a flange member separate from the sleeve, and extends from the vicinity of the butted end of the sleeve main body to the butted end of the sleeve, and from the outer peripheral edge of the flange and the flange. An annular ring part for forming the retainer storage recess, which is composed of a large-diameter cylindrical part extending outward in the axial direction and forms a retainer storage recess in which each end of the retainer is fitted with the butted end of the sleeve body. The flange member is formed with a perforated plate-like portion and a perforated portion whose abutting surface is flush with the abutting surface of the annular ring portion for forming the retainer receiving recess of the sleeve. Formed on the side opposite the abutting surface of the ring-shaped portion, and is formed of an annular inward projecting portion that is brought into contact with the abutting surface of the annular ring portion for forming the retainer receiving recess of the sleeve. In some cases, the joint members are coupled to each other by screwing a bolt penetrating into the other joint member.

  Here, the other joint member may be a block-shaped joint member, and may be a tubular joint member made of a sleeve and a flange member separate from the sleeve.

  In such a fluid coupling, since the sleeve and the flange member are separated from each other, the torque associated with the bolt tightening is borne by the flange member, and the sleeve is hardly subjected to rotational force. Also, since the sleeve constitutes a sealing device, it is necessary to ensure a sealing function, while the flange member does not affect the sealing performance. For example, the sleeve is made of SUS316LM, and the flange member SUS304. It can be made of a different material such as manufactured, and the cost can be reduced while ensuring high sealing performance.

  According to the joint sealing device of the present invention, the annular gasket interposed between the butt end faces of both joint members, the gasket is held, and both end portions are provided in the annular retainer housing recess provided on the butt end face of each joint member. Each of which has an annular retainer, a large diameter inner peripheral surface into which the gasket outer peripheral surface is fitted, a small diameter inner peripheral surface having a smaller diameter than the large diameter inner peripheral surface, and a small diameter inner peripheral surface. And a stepped surface that prevents the gasket from moving in one axial direction at the boundary between the inner diameter and the large-diameter inner peripheral surface. A small-diameter elastic ring is inserted into the outer periphery of the retainer, and a large-diameter elastic ring is inserted into the outer periphery of the retainer to hold the retainer on the joint member. Common to be able to use, it is possible to reduce the hassle of storage and management of parts for repair.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the joint seal device (10) according to the present invention includes an annular gasket (11), an annular retainer (12) for holding the gasket (11), and an inner periphery of the retainer (12). A small-diameter elastic ring (13) fitted and a large-diameter elastic ring (14) fitted on the outer periphery of the retainer (12) are provided.

  The gasket (11) exhibits sealing properties by plastic deformation, and includes a large diameter part (15) and a small diameter part (16) having the same inner diameter as the large diameter part (15) and a small outer diameter.

  The retainer (12) has an inner diameter corresponding to the outer diameter of the thin-walled portion (17) having an inner diameter corresponding to the outer diameter of the large-diameter portion (15) of the gasket (11) and the small-diameter portion (16) of the gasket (11). And a thick part (18) having

  The gasket (11) has its large diameter part (15) fitted into the inner diameter of the thin part (17) of the retainer (12) and its small diameter part (16) fitted into the inner diameter of the thick part (18) of the retainer (12). It has been. The boundary between the inner peripheral surface (large-diameter inner peripheral surface) (17a) of the thin-walled portion (17) of the retainer (12) and the inner peripheral surface (small-diameter inner peripheral surface) (18a) of the thick-walled portion (18) is A step surface (19) is provided that prevents the gasket (11) from moving in one axial direction (downward in FIG. 1). The diameter of the outer peripheral surface (small diameter outer peripheral surface) (17b) of the thin wall portion (17) is slightly smaller than the diameter of the outer peripheral surface (large diameter outer peripheral surface) (18b) of the thick wall portion (18).

  A V-shaped annular groove (21) into which the small-diameter elastic ring (13) is fitted is formed on the large-diameter inner peripheral surface (17a) of the retainer (12), and the small-diameter elastic groove is formed in the annular groove (21). By fitting the ring (13), the gasket (11) is prevented from moving in the other axial direction (upward in FIG. 1). Further, a U-shaped annular groove (22) is formed on the large-diameter outer peripheral surface (18b) of the retainer (12), and the large-diameter elastic ring (14) is fitted into the annular groove (22). ing.

  Each elastic ring (13) (14) is called a snap ring in which a metal wire having a circular cross section is formed in a C shape, and has a radial elasticity.

  The small-diameter elastic ring (13) fitted in the annular groove (21) of the large-diameter inner peripheral surface (17a) of the retainer (12) is in a free state and its outer diameter is large-diameter inner peripheral surface (17a). It is held in the annular groove (21) by an elastic force that is larger than the inner diameter of the inner surface and tends to expand in the radial direction. A slight axial gap is formed between the small-diameter elastic ring (13) and the gasket (11), and the small-diameter elastic ring (13) does not normally contact the gasket (11). The gasket (11) is positioned on the step surface (19) on the inner periphery of the retainer (12).

  The large-diameter elastic ring (14) fitted in the annular groove (22) of the large-diameter outer peripheral surface (18b) of the retainer (12) is free and its outer diameter is the large-diameter outer periphery of the retainer (12). It is supposed to be slightly larger than the diameter of the surface (18b). The depth of the annular groove (22) is set so as to accommodate the entire large-diameter elastic ring (14) when it is pushed radially inward.

  This joint seal device (10) holds the gasket (11) so that it can be attached to and detached from the retainer (12), and the small diameter elastic ring (13) and large diameter elastic ring (14) can be attached to and detached from the retainer (12). It is used in the assembled state fitted into the.

  The joint sealing device (10) configured as described above can be used for both block joints and pipe joints.

  FIG. 3 shows an application of the joint sealing device (10) to a block joint.

  As shown in FIGS. 3A and 3B, the block joint (1) includes first and second block joint members (31) (31) having fluid passages (31a) and (32a) communicating with each other. 32), a bolt (33) as a screw means for coupling the joint members (31) and (32) to each other, and the sealing device (10).

  As shown in FIG. 3 (b), retainer housing recesses (34) and (35) surrounding the openings of the fluid passages (31a) and (32a) are provided at the abutting end faces of the joint members (31) and (32). Gasket pressing portions (36) and (37) are provided on the inner peripheral side of the retainer housing recesses (34) and (35). The retainer housing recesses (34) and (35) and the gasket pressing portions (36) and (37) are concentric with each other and formed to have the same shape in the first joint member (31) and the second joint member (32). Has been. The inner diameter of the gasket (11) and the inner diameters of the joint members (31) and (32) (the diameters of the fluid passages (31a) and (32a) and the inner peripheral surfaces of the gasket holding portions (36) and (37)) Are made equal.

  The diameter of the outer peripheral surface (large diameter outer peripheral surface) (18b) of the thick part (18) of the retainer (12) corresponds to the diameter of the outer peripheral surface of the retainer storage recess (34) (35). The thick-walled portion (18) of 12) is fitted into the retainer housing recess (35) of the second joint member (32) shown in the lower part of FIG. 14) prevents the second joint member (32) from falling off. The diameter of the outer peripheral surface (small outer peripheral surface) (17b) of the thin part (17) of the retainer (12) is slightly smaller than the outer peripheral surface (large outer peripheral surface) (18b) of the thick part (18) Thus, the first fitting member (31) is loosely fitted into the retainer housing recess (34).

  According to this block joint (1), the retainer (12) can be held by either the first or second joint member (31) (32), and the butt end face shape of the joint member (31) (32) can be distinguished. Can be assembled without When the block joint (1) is assembled, the thick part (18) of the retainer (12) of the seal device (10) is connected to either one of the joint members (the second joint member below in the figure in the illustrated example) ( 32). At this time, the large diameter outer peripheral surface (18b) of the retainer (12) is just fitted into the retainer storage recess (35) of the second joint member (32). Secured. After this, when the other joint member (first joint member in the upper part of the figure in the illustrated example) (31) is abutted against the second joint member (32), the small-diameter outer peripheral surface (17b) of the retainer (12) Is loosely fitted in the retainer housing recess (34) of the first joint member (31), thereby correcting the radial displacement between the joint members (31) and (32).

  In addition, each gasket holding | suppressing part (36) (37) shown in FIG.3 (b) makes the internal peripheral surface and the internal diameter of each coupling member (31) (32) equal, and each gasket holding | suppressing part ( 36) Although there is no surface perpendicular to the axial direction on the radially outward and inward sides of (37), as shown in FIG. 4, the radially outward sides of the gasket pressing portions (38) and (39) Are provided with surfaces (38a) and (39a) orthogonal to the axial direction, respectively, and surfaces (38b) and (39b) orthogonal to the axial direction are respectively inward in the radial direction of the gasket pressing portions (38) and (39). It may be provided.

  FIG. 5 shows an application of the joint sealing device (10) to a pipe joint.

  As shown in FIGS. 5 (a) and 5 (b), the pipe joint (2) has first and second tubular joint members (41) (42) having fluid passages (41a) (42a) communicating with each other. ), Screw means (43) for coupling the joint members (41) and (42) to each other, and the sealing device (10).

  At the end of each joint member (41) (42), there is a gasket holding part (46) (47) having the same shape as the gasket holding part (36) (37) of the block joint (1). Retainer storage recess formed on the extension of cylindrical body (41b) (42b) of (42) and having the same shape as the retainer storage recess (34) (35) of block joint (1) above Retainer housing recess forming annular ring portions (48) and (49) forming (44) and (45) are formed radially outward of the gasket pressing portions (46) and (47).

  The annular ring portion (48) (49) for forming the retainer housing recess is a flange portion (48a) extending radially outward from the vicinity of the end of the cylindrical body (41b) (42b) of the joint member (41) (42). ) (49a) and large-diameter cylindrical portions (48b) (49b) extending outward in the axial direction from the outer peripheral edge portions of the flange portions (48a) (49a).

  The screw means (43) is fitted to the right second joint member (42) in the drawing, and is a male screw member (50) abutted from the right side on the right surface of the flange portion (49a) of the second joint member (42). ) And the first joint member (41) on the left side of the figure, and is screwed onto the screw member (50) from the left side. The left side of the flange portion (48a) of the first joint member (41) The top wall (51a) is composed of a cap nut (51) which is abutted from the left via a thrust bearing (52).

  The gasket holding part (46) (47) of each joint member (41) (42) and the retainer storage recess (44) (45) are gasket holding parts (1) with axial dimensions and radial dimensions ( 36) (37) and retainer storage recess (34) (35), respectively, so that this pipe joint can be used without changing the sealing device (10) used in the block joint (1). Can be used for (2).

  According to this pipe joint (2), the retainer (12) can be held by either the first or second joint member (41) (42), and the butt end face shape of the joint member (41) (42) can be distinguished. Can be assembled without When assembling the pipe joint (2), the thick part (18) of the retainer (12) of the seal device (10) is either one of the joint members (the second joint member on the right side of the figure in the illustrated example). In this case, the large-diameter outer peripheral surface (18b) of the retainer (12) is fitted into the retainer storage recess (45) of the second joint member (42), so that they are concentric with each other. Is secured. After that, when the other joint member (the first joint member on the left in the figure in the illustrated example) (41) is abutted against the second joint member (42), the small-diameter outer peripheral surface (17b) of the retainer (12) ) Fits loosely into the retainer housing recess (44) of the first joint member (41), thereby correcting the radial displacement between the joint members (41) and (42).

  In addition, each gasket pressing part (46) (47) shown in FIG. 5 is provided with a surface orthogonal to the axial direction on the radially outer side and the inner side thereof, but is not limited to this. The protrusion shape may be increased by eliminating the surface perpendicular to the axial direction that exists outward and / or inward.

  The joint seal device (10) can also be used in the fluid joint shown in FIG.

  In FIG. 6, the sealing device (10) is provided at the abutting portion between the block joint member (61) and the tubular joint member (62). An on-off valve (66) is attached to the block joint member (61), and fluid passages (61a) (61b) communicating with the on-off valve (66) are formed.

  The block joint member (61) is provided with a gasket pressing portion (36) for the block joint (1) and a retainer housing recess (34) (refer to FIG. 3 for the detailed structure).

  The tubular joint member (62) includes a sleeve (64) and a flange member (65) separate from the sleeve (64).

  The sleeve (64) has a fluid passage (64a) communicating with one fluid passage (61b) of the block joint member (61). At the butt end of the sleeve (64), a retainer storage recess is formed between the gasket holding section (46) for the pipe joint (2) and the retainer storage recess (44) between the butt end of the sleeve body. A forming annular ring portion (48) is provided integrally (see FIG. 5 for the detailed structure).

  The flange member (65) is fitted on the outer periphery of the butt end portion of the sleeve (64), and the butt surface is flush with the butt surface of the annular ring portion (48) for forming the retainer storage recess of the sleeve (64). Perforated square plate-like portion (65a) and the opposite side of the perforated square plate-like portion (65a) and the ring ring portion (48) for forming the retainer receiving recess of the sleeve (64). It comprises an annular inward protrusion (65b) that is brought into contact with the abutting surface from the axial direction.

  As a screw means for connecting the block joint member (61) and the tubular joint member (62), a bolt (63) for the block joint (1) is used, and a perforated rectangular plate of the flange member (65) is used. The joint members (61) and (62) are connected to each other by screwing a bolt (63) penetrating the shaped portion (65a) in the axial direction into the block-shaped joint member (61).

  According to the fluid coupling shown in FIG. 6, the block-shaped joint member (61) and the tubular joint member (62) do not require welding, and are common to the block joint (1) and the pipe joint (2). ), The assembly of the fluid coupling can be made simpler and easier.

  Further, according to the fluid coupling shown in FIG. 6, the torque associated with tightening the bolt (63) is borne by the flange member (65), and the sleeve (64) is hardly subjected to rotational force. The deterioration of the sealing performance due to tightening of the bolt (63) is prevented. Here, since the sleeve (64) constitutes the sealing device (10), in order to ensure its function, the sleeve (64) is made of, for example, SUS316LM, and the flange member (65) affects the sealing performance. Therefore, it is made of another material such as SUS304.

  When an inlet / outlet portion is further added to the block-like joint member (61) shown in FIG. 6 for fluid inlet or outlet, as shown in FIG. 7, the tubular joint member (62) ( A flange type pipe joint) may be used, and as shown in FIG. 8, a tubular joint member similar to FIG. 5 (cap nut type pipe joint) may be used. Further, the flange-type tubular joint member (62) shown in FIG. 6 can be used in place of the cap nut-type pipe joint shown in FIG. In the following description, the same components as those shown in FIGS. 5 and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 7, a fluid passage (61a) that opens to the left and communicates with the on-off valve (66) is extended to the block-shaped joint member (61), and communicates with the on-off valve (66) and to the right. An open fluid passage (61c) is formed. The same tubular joint member (62) as shown in FIG. 6 is attached to the right surface of the block-shaped joint member (61), thereby forming an entrance / exit part used for connection to the outside.

  In FIG. 8, a fluid passage (61a) that opens to the left and communicates with the on-off valve (66) is extended to the block-shaped joint member (61), and communicates with the on-off valve (66) and to the right. An extending fluid passage (61c) is formed. The right side surface of the block-shaped joint member (61) is provided with a tubular right protruding portion (71) having a fluid passage (71a) extending to the right and continuing to the fluid passage (61c) extending to the right. Yes. The right protrusion (71) has a shape in which the second joint member (42) and the male screw member (50) shown in FIG. 5 are integrated, and the right protrusion (71) By attaching the first joint member (41) shown in FIG. 5 via the cap nut (51), an entrance / exit part used for connection to the outside is formed.

  9, the tubular joint member (62) shown in FIG. 6 and another tubular joint member (81) similar thereto are used, and these joint members (62) (81) are the same as described above. A pipe joint is formed by abutting through the sealing device (10). The other tubular joint member (81) is the same as the tubular joint member (62) shown in FIG. 6 in that it comprises a sleeve (64) and a flange member (82), and the tubular joint member shown in FIG. In (62), the screw insertion hole (65c) is formed in the flange member (65), but only the female screw (82a) is formed in the flange member (82).

  In the above description, the flange member (65) is composed of the perforated rectangular plate-shaped portion (65a) and the annular inward projecting portion (65b), but the perforated rectangular plate-shaped portion (65a) (circular to the rectangular plate) Of course, a perforated circular plate-shaped portion (a circular plate provided with a circular hole) may be used.

FIG. 1 is a longitudinal sectional view showing an embodiment of a sealing device according to the present invention. FIG. 2 is an exploded perspective view of the same. 3A and 3B are diagrams showing a block joint as a first application example of the joint sealing device according to the present invention. FIG. 3A is a longitudinal sectional view, and FIG. 3B is an enlarged longitudinal sectional view of an essential part thereof. FIG. 4 is an enlarged vertical cross-sectional view of a main part showing a modification of the joint sealing device shown in FIG. FIG. 5 is a view showing a pipe joint (an example of a fluid coupling according to the present invention) which is a second application example of the joint sealing device according to the present invention. FIG. 5 (a) is a longitudinal sectional view, and FIG. It is an expanded vertical sectional view of a part. FIG. 6 is a view showing a fluid coupling (another example of the fluid coupling according to the present invention) which is a third application example of the joint sealing device according to the present invention, wherein (a) is a plan view and (b) is a vertical section. FIG. FIG. 7 is a vertical sectional view showing a fluid coupling (another example of the fluid coupling according to the present invention) which is a fourth application example of the joint sealing device according to the present invention. FIG. 8 is a vertical sectional view showing a fluid coupling (another example of the fluid coupling according to the present invention) which is a fifth application example of the joint sealing device according to the present invention. FIG. 9 is a longitudinal sectional view showing a pipe joint (another example of the fluid coupling according to the present invention) which is a sixth application example of the joint sealing device according to the present invention.

Explanation of symbols

(2) Pipe fitting (fluid fitting)
(10) Sealing device
(11) Gasket
(12) Retainer
(13) Small diameter elastic ring
(14) Large diameter elastic ring
(17a) Thin wall inner peripheral surface (large diameter inner peripheral surface)
(17b) Thin wall outer peripheral surface (small diameter outer peripheral surface)
(18a) Thick part inner peripheral surface (small diameter inner peripheral surface)
(18b) Thick wall outer peripheral surface (large diameter outer peripheral surface)
(19) Step surface
(34) (35) Retainer storage recess
(41) (42) Tubular joint member
(41a) (42a) Fluid passage
(41b) (42b) Cylindrical body
(44) (45) Retainer storage recess
(48) (49) Retainer storage recess formation annular ring
(48a) (49a) Flange
(48b) (49b) Large diameter cylindrical part
(51) Cap nut
(61) Block joint member
(61b) Fluid passage
(62) Tubular joint members
(63) Bolt
(64) Sleeve
(64a) Fluid passage
(65) Flange member
(65a) Perforated plate
(65b) An annular inward projection

Claims (4)

A sealing device provided at a butt portion of first and second joint members having fluid passages communicating with each other,
An annular gasket interposed between the butted end surfaces of both joint members, and an annular retainer for holding the gasket and having both end portions fitted in annular retainer receiving recesses provided on the butted end surfaces of the respective joint members. The retainer inner periphery has a large-diameter inner peripheral surface into which the gasket outer peripheral surface is fitted, a small-diameter inner peripheral surface having a smaller diameter than the large-diameter inner peripheral surface, and a boundary portion between the small-diameter inner peripheral surface and the large-diameter inner peripheral surface. And a stepped surface that prevents the gasket from moving in one axial direction, and a small-diameter elastic ring that prevents the gasket from moving in the other axial direction is fitted into the large-diameter inner peripheral surface of the retainer. A large-diameter elastic ring for retaining the retainer on the joint member is fitted on the outer periphery of the retainer.   The retainer has a large-diameter outer peripheral surface corresponding to the outer diameter of the retainer housing recess and a smaller-diameter outer peripheral surface smaller than this, and an annular groove is formed on the large-diameter outer peripheral surface, and a large-diameter is formed in the annular groove. 2. The joint sealing device according to claim 1, wherein an elastic ring is fitted. A fluid coupling comprising a pair of tubular coupling members, a cap nut as a screw means, and the coupling sealing device according to claim 1,
It consists of a flange part extending radially outward from the vicinity of the butted end of the cylindrical body of the joint member, and a large diameter cylindrical part extending axially outward from the outer peripheral edge of the flange part, and each end of the retainer is fitted An annular ring portion for forming a retainer-accommodating recess is formed on each of the joint members to form a retainer-accommodating recess to be formed between the butted end of the cylindrical body. A fluid coupling comprising a pair of coupling members, a bolt as a screw means, and the coupling sealing device according to claim 1,
One of the joint members consists of a sleeve and a flange member separate from the sleeve, and extends from the vicinity of the butted end of the sleeve main body to the butted end of the sleeve, and from the outer peripheral edge of the flange and the flange. An annular ring part for forming the retainer storage recess, which is composed of a large-diameter cylindrical part extending outward in the axial direction and forms a retainer storage recess in which each end of the retainer is fitted with the butted end of the sleeve body. The flange member is formed on the perforated plate-like portion where the abutment surface is flush with the abutment surface of the annular ring portion for forming the retainer receiving recess of the sleeve, and on the opposite abutment surface side of the perforated plate-like portion It consists of an annular inward projecting portion that is brought into contact with the anti-butting surface of the annular ring portion for forming the retainer receiving recess of the sleeve, and is a perforated plate shape of a flange member Joint, characterized in that the bolts passing through axially is bonded joint members together by being screwed to the other joint member.

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