JP5789851B2 - Joint sealing device - Google Patents

Description

  The present invention relates to a joint sealing device used in a joint that obtains a sealing performance by plastic deformation of a gasket.

  As a joint sealing device, Patent Document 1 holds 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 a gasket. In addition, there is a description that includes annular retainers that are respectively fitted in annular retainer housing recesses provided on the abutting end surfaces of both joint members.

JP 2010-96329 A

  In the conventional joint sealing device, various configurations have been considered in order to improve the sealing performance of the fluid flowing through the fluid passage of the joint member. However, as for the entry of fine particles from the outside of the joint member, it is possible to enter the retainer housing recess, and the seal between the gasket and the joint member only prevents the fine particles from entering the fluid passage. In other words, there is a possibility that the fine particles may enter the fluid passage from the outside and cannot ensure high cleanliness.

  An object of the present invention is to provide a joint sealing device that can prevent fine particles from entering the fluid passage from the outside and maintain high cleanliness.

  A joint sealing device according to the present invention includes first and second joint members having fluid passages communicating with each other, a gasket interposed between the butted end surfaces of both joint members, In a sealing device provided with retainers that are respectively fitted in retainer storage recesses provided on the butted end surfaces of the joint members, the outer peripheral surface in the retainer storage recess of each joint member is a large-diameter outer peripheral surface portion on the butted end surface side. The retainer includes a cylindrical retainer main body having an outer diameter substantially equal to the diameter of the small-diameter outer peripheral surface portion of the retainer housing recess, and an annular protrusion formed integrally with the retainer main body. And an annular groove that opens on the outer peripheral surface of the annular protrusion, and the retainer is held by the joint member in the annular groove of the retainer. Ring is characterized in that has been fitted.

  Since the annular retainer fitted in the retainer storage recess has a cylindrical retainer body having an outer diameter substantially equal to the diameter of the small diameter outer peripheral surface portion of the retainer storage recess, the small diameter outer peripheral surface portion of the retainer storage recess, the retainer body, Intrusion of fine particles from the outside is prevented by the fitting. Dropping of the retainer from the joint member is prevented by the elastic ring. The fit between the small-diameter outer peripheral surface portion of the retainer housing recess and the retainer main body may be a clearance fit, an interference fit (press fit), or an intermediate fit.

  This joint sealing device is used in an assembled state in which a retainer holds a gasket and an elastic ring is 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 butted portions of the first and second joint members are preferably of the same shape so that the retainer holding the gasket can be attached to both the first and second joint members.

  The joint members are fastened with appropriate screw means. As the screw means, for example, a thread portion is formed on one of the first and second joint members, and is screwed onto the thread portion of the joint member. Both the joint members may be coupled by a cap nut, and the first and second joint members are both sleeves in which the male thread portion is not formed, and the male screw member and the cap nut that are separated from each other. Thus, both joint members may be coupled. 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 gasket is composed of a large-diameter portion and a small-diameter portion having the same inner diameter as the large-diameter portion and a small outer diameter, and the retainer body has a thin-wall portion having an inner diameter corresponding to the outer diameter of the large-diameter portion of the gasket, It consists of a thick part with an inner diameter corresponding to the outer diameter of the small diameter part, and the boundary part between the inner peripheral surface of the thin part and the inner peripheral surface of the thick part of the retainer body moves in one axial direction of the gasket. It is preferable that the stepped surface be blocked.

  If it does in this way, it will become a thing which a gasket and a retainer main body become difficult to isolate | separate, and it is not necessary to arrange | position an elastic ring between a gasket and a retainer main body.

  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 in the gasket. In any case, an annular recess corresponding to the annular protrusion of the joint member is formed in the gasket after the joint member is tightened.

  An annular protrusion is provided on the abutting surface of each joint member, and a flat portion orthogonal to the axial direction is provided on the inner peripheral side of the annular protrusion so that the inner periphery of the flat portion of each joint member and the inner periphery of the gasket are flush with each other. It is preferable. In this case, by providing a flat portion orthogonal to the axial direction on the inner peripheral side of the annular protrusion and the annular recess, a dead space (a space in which fine particles may enter) after tightening of the joint member is substantially reduced. Can be zero.

  It is preferable that the end surfaces of the outer peripheral portions of the joint members forming the outer peripheral wall of each retainer housing recess are in close contact with each other. This close contact is obtained at the final stage of tightening. By doing so, not only can the entry of fine particles from the outside be prevented, but also the response when tightening the joint member changes at the close contact. Therefore, the function of preventing over-tightening can also be obtained.

  According to the joint sealing device of the present invention, the annular retainer fitted in the retainer housing recess is formed integrally with the cylindrical retainer body having an outer diameter substantially equal to the diameter of the small-diameter outer peripheral surface portion of the retainer housing recess, and the retainer body. Since the ring-shaped projecting portion and the annular groove opening on the outer peripheral surface of the ring-shaped projecting portion, and the elastic ring for holding the retainer to the joint member is fitted in the annular groove of the retainer, With respect to the intrusion of fine particles from the outside, this invasion is prevented by fitting the small diameter outer peripheral surface portion of the retainer housing recess and the retainer body. Thereby, fine particles from the outside are prevented from entering the fluid passage, and high cleanliness can be maintained.

FIG. 1 is a longitudinal sectional view showing an embodiment of a sealing device according to the present invention. FIG. 2 is a longitudinal sectional view showing a block joint which is a first application example of the joint sealing device according to the present invention. FIG. 3 is a longitudinal sectional view showing a pipe joint which is a second application example of the joint sealing device according to the present invention. FIG. 4 is a longitudinal sectional view showing another example of a pipe joint which is a third application example of the joint sealing device according to the present invention.

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

  As shown in FIG. 1, the joint sealing device (4) according to the present invention includes first and second joint members (5) (6) having fluid passages (5a) (6a) communicating with each other. An annular gasket (11), an annular retainer (12) for holding the gasket (11), and an elastic ring (13) fitted on the outer periphery of the retainer (12) are provided.

  An annular retainer receiving recess (7) (8) is provided on the end face of each joint member (5) (6). The outer peripheral surface in each retainer storage recess (7) (8) is a large-diameter outer peripheral surface portion (7a) (8a) on the butt end surface side, and a smaller-diameter outer peripheral surface portion (7b) (8b) on the inner side in the axial direction. Consists of. A retainer (12) is fitted to a portion of each joint member (5) (6) where the retainer housing recesses (7) and (8) are combined.

  The gasket (11) exhibits sealing properties by plastic deformation, and includes a large diameter portion (14) and a small diameter portion (15) having the same inner diameter as the large diameter portion (14) and a small outer diameter.

  The retainer (12) includes a cylindrical retainer body (16) having an outer diameter substantially equal to the diameter of the small-diameter outer peripheral surface portion (7b) (8b) of the retainer housing recess (7) (8), and An annular protrusion (17) formed integrally and having a slightly smaller outer diameter than the outer diameter of the large-diameter outer surface (7a) (8a) of the retainer storage recess (7) (8), and the outer peripheral surface of the annular protrusion (17) And an annular groove (18) that is open.

  The gasket (11) is made of, for example, nickel alloy or stainless steel, and the retainer (12) is made of, for example, stainless steel.

  The retainer body (16) corresponds to the outer diameter of the thin-walled portion (16a) having an inner diameter corresponding to the outer diameter of the large-diameter portion (14) of the gasket (11) and the small-diameter portion (15) of the gasket (11). It consists of a thick part (16b) having an inner diameter.

  The gasket (11) has a large diameter portion (14) on the inner diameter of the thin wall portion (16a) of the retainer body (16) and a small diameter portion (15) on the inner diameter of the thick wall portion (16b) of the retainer main body (16). It is inserted. The boundary between the inner peripheral surface of the thin wall portion (16a) and the inner peripheral surface of the thick wall portion (16b) of the retainer body (16) is moved to one axial direction (left side in FIG. 1) of the gasket (11). It is assumed that the step surface (16c) prevents this.

  The annular groove (18) of the retainer (12) is formed in a substantially U shape, and an elastic ring (13) is fitted into the annular groove (18). The elastic ring (13) is called a snap ring in which a metal wire having a circular cross section is formed in a C shape, and has elasticity in the radial direction. The elastic ring (13) is not limited to a snap ring, and various ring-shaped members having elasticity such as an O-ring can be used.

  The elastic ring (13) is in a free state, and its outer diameter is slightly larger than the diameter of the annular protrusion (17) of the retainer (12). The depth of the annular groove (18) is set to be large enough to accommodate the elastic ring (13) when it is pushed inward in the radial direction.

  The annular groove (18) is not arranged in the central portion of the retainer body (16), but is formed so as to be closer to the end of either one (left in the illustrated example) than the center. The ring (13) is sandwiched between any one of the joint members (first joint member in the illustrated example) (5) and the retainer (12).

  This joint seal device (4) is used in an assembled state in which the retainer (12) holds the gasket (11) in a detachable manner, and the elastic ring (13) is detachably fitted in the retainer (12). The The retainer (12) can be held by either of the first and second joint members (5) and (6), and can be assembled without distinguishing the shape of the butted end surfaces of the joint members (5) and (6).

  According to the joint sealing device (4) of the present invention, the retainer main body (16) having the outer diameter equal to the diameter of the small-diameter outer peripheral surface portions (7b) (8b) of the retainer housing recesses (7) (8) and the retainer housing recess (7) (8) is fitted to the small-diameter outer peripheral surface (7b) (8b) to prevent the entry of fine particles from the outside, and the fine particles from the outside enter the fluid passage (5a) (6a) Therefore, a high cleanliness can be maintained.

  The degree of fitting between the retainer body (16) and the small-diameter outer peripheral surface (7b) (8b) of the retainer storage recess (7) (8) is determined by the dropout of the retainer (12) from the joint member (5). Since it is prevented by (13), it may be a clearance fit.

  FIG. 1 shows a state after being properly tightened, and a high sealing performance is obtained by the deformation of the gasket (11). In this state, the end faces of the outer peripheral portions (5b) and (6b) of the joint members (5) and (6) forming the outer peripheral wall of the retainer storage recesses (7) and (8) are in close contact with each other. Intrusion of fine particles from the outside is prevented. In addition, since the end faces of the outer peripheral portions (5b) and (6b) of the joint members (5) and (6) are in close contact with each other, the response when the joint members (5) and (6) are tightened changes. The outer peripheral portions (5b) and (6b) of the joint members (5) and (6) also have a function of preventing over-tightening.

  The joint sealing device (4) configured as described above can be used for both block joints and pipe joints by forming the first and second joint members (5) and (6) into a required shape. It has become a thing. An example is shown below. In the following description, the configuration of the main part of each joint member (31) (32) (41) (42) (51) (52), that is, retainer storage recess (7) (8), gasket (11), The retainer (12) and the elastic ring (13) are the same as the first and second joint members (5) and (6) shown in FIG.

  FIG. 2 shows the application of the joint sealing device (4) to a block joint. As shown in the figure, the block joint (1) includes first and second block joint members (31) and (32) having fluid passages (31a) and (32a) communicating with each other, and joint members. (31) (32) The bolt (33) as a screw means for joining together, the retainer housing recess (7) (8), the gasket (11), the retainer (12) and the elastic ring (13) And a sealing device (4).

  FIG. 3 shows an application of the joint sealing device (4) to a pipe joint. As shown in the figure, the pipe joint (2) includes first and second tubular joint members (41) and (42) having fluid passages (41a) and (42a) communicating with each other, and joint members ( 41) (42) screw means (43) for connecting together, retainer housing recess (7) (8), gasket (11), retainer (12) and elastic ring (13) provided with the sealing device ( And 4).

  The screw means (43) is fitted to the right second joint member (42) in the drawing and is abutted from the right with the right surface of the flange portion (42b) of the second joint member (42) (44 ) And the first joint member (41) on the left side of the drawing and screwed into the screw member (44) from the left side, and on the left surface of the flange portion (41b) of the first joint member (41) The top wall (45a) is composed of a cap nut (46) which is abutted from the left via a thrust bearing (47).

  FIG. 4 shows an application of the joint sealing device (4) to another example of a pipe joint. As shown in the figure, the pipe joint (3) includes first and second tubular joint members (51) and (52), and screw means (57) for coupling the joint members (51) and (52) to each other. The retainer housing recesses (7) and (8), the gasket (11), the retainer (12), and the sealing device (4) including the elastic ring (13) are provided. Each joint member (51) (52) comprises a sleeve (53) (55) and a flange member (54) (56), which are separated from each other, and the inside of the sleeve (53) (55) is a fluid passageway (53a). (55a). The screw means (57) is formed in the screw insertion hole (54a) formed in the flange member (54) of the first joint member (51) and in the flange member (56) of the second joint member (52). (56a) and a bolt (58) inserted through the screw insertion hole (54a) of the first joint member (51) and screwed into the female thread (56a) of the second joint member (52).

  (4): Sealing device for joint, (5): First joint member, (6): Second joint member, (5a) (6a): Fluid passage, (7) (8): Retainer housing recess, (7a) (8a): Large diameter outer peripheral surface part, (7b) (8b): Small diameter outer peripheral surface part, (11): Gasket, (12): Retainer, (13): Elastic ring, (14): Large diameter part, (15): Small diameter part, (16): Retainer body, (16a): Thin part, (16b): Thick part, (17): Annular protrusion, (18): Annular groove

Claims (4)

First and second joint members having fluid passages communicating with each other, a gasket interposed between the butted end surfaces of both joint members, and holding the gasket, provided on the butted end surfaces of both joint members In a sealing device provided with retainers that are respectively fitted in the retainer storage recesses,
The outer peripheral surface in the retainer storage recess of each joint member is composed of a large-diameter outer peripheral surface portion on the butt end surface side and a small-diameter outer peripheral surface portion on the opposite side in the axial direction. A cylindrical retainer body having an outer diameter substantially equal to the outer diameter of the retainer body, an annular protrusion formed integrally with the retainer body, and an annular groove opening on the outer peripheral surface of the annular protrusion. A joint sealing device, wherein an elastic ring for holding the retainer on the joint member is fitted.   The gasket is composed of a large-diameter portion and a small-diameter portion having the same inner diameter as the large-diameter portion and a small outer diameter, and the retainer body has a thin-wall portion having an inner diameter corresponding to the outer diameter of the large-diameter portion of the gasket, It consists of a thick part with an inner diameter corresponding to the outer diameter of the small diameter part, and the boundary part between the inner peripheral surface of the thin part and the inner peripheral surface of the thick part of the retainer body moves in one axial direction of the gasket. The joint sealing device according to claim 1, wherein the joint sealing device is a stepped surface for blocking.   An annular protrusion is provided on the abutting surface of each joint member, and a flat portion orthogonal to the axial direction is provided on the inner peripheral side of the annular protrusion so that the inner periphery of the flat portion of each joint member and the inner periphery of the gasket are flush with each other. The joint sealing device according to claim 1 or 2. The joint sealing device according to any one of claims 1 to 3, wherein end faces of outer peripheral portions of the joint members forming the outer peripheral wall of each retainer housing recess are in close contact with each other .

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