JP5610692B2 - Fluid leakage prevention device - Google Patents

Description

  The present invention relates to a fluid leakage prevention tool for preventing fluid leakage from a tube, a tube connecting portion, a valve, or the like.

  If fluid leakage occurs due to damage such as cracks in the pipe or deterioration of the gasket at the flange connection, repairs such as filling or welding of repair materials or gasket replacement are generally performed. Since the pressure must be released by removing the fluid once, there is a problem that the working efficiency is poor. For this reason, it has been conventionally studied to cover a fluid leakage portion with a cover and prevent diffusion to the outside (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 9-14543 Japanese Patent Laid-Open No. 10-73190

  However, the structure of the conventional cover still has a possibility that the fluid may flow out to the outside because sufficient sealing performance cannot be obtained. For example, in the configuration disclosed in Patent Document 1, a cover divided into two is fastened by a fastener, but it is sufficient because only a caulking material is filled between the tube and the cover. In particular, when the fluid is a gas, there is a high possibility that it will diffuse to the outside.

  In addition, the configuration disclosed in Patent Document 2 has a structure in which a packing is interposed between a pipe and a cover, and a locking claw is bitten into an outer peripheral surface of the pipe by tightening a push bolt, thereby pulling the pipe. The low-strength part is reinforced by restricting elongation due to load. However, since the tightening force of the push bolt does not act on the packing, the fluid may leak from between the tube and the cover.

  Accordingly, an object of the present invention is to provide a fluid leakage prevention tool that can reliably prevent fluid leakage.

The object of the present invention is a fluid leakage preventer that is mounted on the outer surface of a flow passage body through which fluid passes, and has a plurality of divided covers that can be connected to each other so as to cover the flow passage body. A main body, a seal body interposed between the flow path body and the cover main body, a frame body having a plurality of through screw holes and surrounding the cover main body along the seal body, and the through screw holes A plurality of pressing members whose front ends press against the seal body via the cover main body by being screwed into the cover, and an annular contact member arranged so as to cover the cover main body and abutting on the front end of the pressing member The seal body is made of a material that is elastically deformed and / or plastically deformed by applying a pressing force, and the abutting material is achieved by a fluid leakage prevention tool using metal .

  Moreover, it is preferable that the said cover main body has a communicating hole which can connect the collection space formed between the outer surfaces of a flow-path body at the time of mounting | wearing to a flow-path body with the exterior.

  Moreover, the said sealing body can be preferably formed from an expanded graphite or a fluororesin.

  According to the fluid leakage prevention tool of the present invention, fluid leakage can be reliably prevented.

It is a front view of the fluid leakage prevention tool which concerns on one Embodiment of this invention. It is a side view of the arrow A direction in FIG. It is BB sectional drawing in FIG. It is sectional drawing of the leakage prevention tool of the fluid which concerns on other embodiment of this invention. It is CC sectional drawing in FIG. It is a principal part enlarged view of the fluid leakage prevention tool shown in FIG. It is a principal part enlarged view of the fluid leakage prevention tool shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of a fluid leakage preventer according to an embodiment of the present invention, and FIG. 2 is a side view in the direction of arrow A in FIG. In FIG. 2, a part of the leakage prevention tool is cut out.

  As shown in FIG. 2, the fluid leakage prevention tool 1 of the present embodiment has flanges 51a and 52a formed at the ends of two straight pipes 51 and 52, respectively, and a gasket 55 interposed therebetween. In this state, two semi-cylindrical divided covers 11 and 12 constituting the cover body 10 are attached to the flow path body 50 fastened by screwing nuts 54 and 54 to both ends of the stud bolt 53. It has. For the fastening of the flanges 51a and 52a, various known connecting tools can be used. For example, a combination of a hexagon bolt and a nut may be used.

  As shown in FIGS. 1 and 2, the split covers 11 and 12 are provided with flanges 11a and 12a on both side edges, respectively, and are formed on the flanges 11a and 12a in a state where the corresponding flanges 11a and 12a are joined to each other. The flanges 11a and 12a can be fastened by inserting the bolts 13 through the plurality of through-holes, whereby the cover body 10 is configured. As shown in FIG. 3 to be described later, the flanges 11a and 12a of the present embodiment are separate members from the thin plates constituting the divided covers 11 and 12, and sandwich the flanges formed by bending the edges of the thin plates. However, the entire divided covers 11 and 12 may be integrated with each other. Further, in the present embodiment, the flanges 11a and 12a are fastened by screwing the tip end portion of the bolt 13 into the female screw portion formed in the through hole of one flange 11a, but a combination of a bolt and a nut is used. May be.

  The cover body 10 has a shape in which an axial center portion bulges outward, and a fluid collection space S is formed between the cover body 10 and the flow path body 50. The collection space S can communicate with the outside through a communication hole 15 formed in the cover body 10.

  Further, the leakage prevention tool 1 includes two annular seal bodies 20 and 20 (only one is shown in FIG. 2) interposed between the flow path body 50 and the cover body 10 in the vicinity of both ends in the axial direction of the cover body 10. And frame bodies 30 and 30 arranged so as to surround the cover body 10 along the seal bodies 20 and 20, and a plurality of pressing bolts that press the seal bodies 20 and 20 toward the flow path body 50. 40.

  The seal body 20 is made of a gasket or the like, and seals between the flow path body 50 and the cover body 10. The frame 30 is composed of two semicircular divided frames 31 and 32, and the divided frames 31 and 32 are provided with flanges 31a and 32a on both side edges, respectively. Corresponding flanges 31a and 32a can be fastened by a plurality of bolts 33 and nuts 34, whereby the frame 30 is configured. The frame body 30 is formed with a plurality of through screw holes 35 into which the pressing bolts 40 are screwed in at substantially equal intervals along the circumferential direction. Between the front end portion of the pressing bolt 40 and the cover main body 10, a strip-shaped pad 41 having a width (height) substantially the same as the width (height) of the seal body 20 is interposed. Some of the plurality of pressing bolts 40 are in contact with the flanges 11a and 12a at their tips, and press the seal body 20 via the flanges 11a and 12a.

  3 is a cross-sectional view taken along the line BB in FIG. The seal body 20 is formed by annularly combining two split seals 21 and 22 that are curved in a semicircular shape, and an edge protruding outward is sandwiched between the flanges 11a and 12a of the split covers 11 and 12. By doing so, the split surface of the cover main body 10 is sealed. The seal body 20 is disposed between the outer surface of the straight pipe 51 constituting the flow path body and the inner surface of the cover body 10 in close contact with both. The abutting member 41 is disposed on the outer surface side of the cover body 10 so as to abut on the tip end portion of the pressing bolt 40 screwed into the through screw hole 35 of the frame body 30.

  When the fluid leakage prevention tool 1 having the above-described configuration is attached to the flow path body 50, first, the flanges 11a and 12a of the divided covers 11 and 12 are joined so as to sandwich the flow path body 50 from both sides. The flanges 11a and 12a are fastened by bolts 13. As a result, the cover body 10 is configured, and the periphery of the connection portion by the flanges 51a and 52a of the flow path body 50 where the fluid may leak can be covered with the cover body 10. The collection space S formed between the flow path body 50 and the cover body 10 is sealed by seal bodies 20 and 20 disposed at both ends in the axial direction of the cover body 10.

  Next, the flanges 31 a and 32 a of the split frames 31 and 32 are joined to each other in the vicinity of both axial ends of the cover body 10, and the flanges 31 a and 32 a are fastened by bolts 33 and nuts 34. The two frame bodies 30, 30 configured in this way are attached to the cover main body 10 by the support bolts 42, and each pressing bolt 40 is screwed inward in the radial direction in a state where the abutting member 41 is arranged, thereby sealing body A pressing force can be applied to 20.

  According to the fluid leakage preventive tool 1 of the present embodiment, the pressing bolt 40 is applied to the seal body 20 by screwing the pressing bolt 40 in addition to the tightening force generated by the fastening of the flanges 11a and 12a of the divided covers 11 and 12. Since the thrust force in the thickness direction due to the thrust acts, the sealing body 20 can be sufficiently compressed to improve the sealing performance. Therefore, even if the fluid leaks into the collection space S of the cover body 10 due to cracks or damage to the flow path body 50, the leakage of the fluid to the outside of the cover body 10 can be reliably prevented.

  Further, by arranging the contact member 41 between the front end portion of the pressing bolt 40 and the outer surface of the cover main body 10, the thrust of the pressing bolt 40 is dispersed in the circumferential direction, and the compressive force acting on the seal body 20 is uniform. Can be achieved. The material of the abutting member 41 is preferably a metal having appropriate rigidity and hardness so that the seal body 20 can be uniformly compressed and can withstand the bolt load of the pressing bolt 40, and examples thereof include carbon steel and stainless steel. be able to. However, the abutting member 41 is not essential in the present invention, and the tip of the pressing bolt 40 may be configured to directly press the cover main body 10.

  In addition, by providing the communication hole 15 that communicates the collection space S formed between the flow path body 50 and the cover body 10 with the outside, the collection space S due to the fluid leaking into the collection space S is provided. An increase in internal pressure can be prevented, and the fluid can be safely recovered via a recovery line (not shown) connected to the communication hole 15.

  The material of the sealing body 20 is not particularly limited as long as it can be elastically deformed and / or plastically deformed by applying a pressing force to obtain a good sealing property. For example, a rubber material can be used. However, in this embodiment, since the seal body 20 can be effectively compressed by the pressing bolt 40, a wide range of materials can be selected. In particular, when expanded graphite or a fluororesin is used as the sealing body 20, the sealing performance can be satisfactorily maintained from a low temperature to a high temperature, which cannot be handled by rubber, and the applicable range can be expanded.

  In the present embodiment, the case where the flow path body 50 is a pipe connecting portion has been described. However, the fluid leakage prevention tool of the present invention has various flows such as a pipe and a valve through which fluid such as gas or liquid passes. Applicable to road bodies. For example, FIGS. 4 to 7 show a fluid leakage preventer when the flow path body is a valve. FIG. 4 is a cross-sectional view of a fluid leakage preventer according to another embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line CC in FIG. 6 and 7 are enlarged views of main parts of FIGS. 4 and 5, respectively.

  As shown in FIGS. 4 to 7, the flow path body 150 formed of a valve is provided with a disc-shaped valve body 153 for opening and closing the flow path inside a valve box 152 through which a fluid passes. Yes. The valve body 153 has a valve shaft 155 attached thereto via a fixed pin 154 and is supported by a sub-valve shaft 156. The valve body 153 is also rotated by the rotation operation of the valve shaft 155 to open and close the flow path. The On both sides of the valve box 152, pipes 157 and 158 are joined by butt welding.

  Such a butt-welded type valve is less susceptible to external leakage of the fluid than when the valve box 152 and the pipes 157 and 158 are connected to each other with a flange, while performing maintenance such as replacement of the parts in the valve box 152. Maintenance hole 159 is required. The maintenance hole 159 is covered with a maintenance cover 161 via a gasket 160, and the maintenance cover 161 is brought into close contact with the peripheral portion of the maintenance hole 159 by screwing a nut 163 into the stud bolt 162. In the flow path body 150 having such a configuration, the joint between the maintenance hole 159 and the maintenance cover 161 is covered with the leakage prevention tool 101.

  The leakage prevention tool 101 includes a cover main body 110 including a cylindrical divided cover 111 and a flat divided cover 112. The flat divided cover 112 is formed in an oval shape according to the opening shape of the maintenance hole 159, and a gasket 119 is interposed between the upper edge flange 111 a of the tubular divided cover 111 and the bolt 113. It is connected. A communication hole 115 is formed in the center of the flat divided cover 112, and the collection space S inside the cover main body 110 can communicate with the outside through the communication hole 115.

  The cylindrical divided cover 111 is composed of two semi-circular annular divided covers 1111 and 1112. The divided covers 1111 and 1112 are respectively provided with side edge flanges 1111a and 1112a on both side edges, and a plurality of side edge flanges 1111a and 1112a are joined to each other, and a plurality of side edge flanges 1111a and 1112a are joined to each other. By inserting the bolts 113 into the through holes, the side edge flanges 1111a and 1112a can be fastened.

  The side edge flanges 1111a and 1112a of the present embodiment are separate members from the thin plates constituting the divided covers 1111 and 1112, and are configured to sandwich a flange portion formed by bending the edge portions of the thin plates. However, the entire divided covers 1111 and 1112 may be integrated. Further, in this embodiment, the flanges 1111a and 1112a are fastened by screwing the front end portion of the bolt 113 into the female screw portion formed in the through hole of one flange 1111a, but a combination of a bolt and a nut is used. May be.

  In addition, the leakage prevention tool 101 includes an annular seal body 120 interposed between the flow path body 150 and the cover body 110 in the vicinity of the open end side of the cover body 110 (the lower end side of the tubular divided cover 111). A frame body 130 disposed so as to surround the cover main body 110 along the seal body 120 and a plurality of pressing bolts 140 that press the seal body 120 toward the flow path body 150 are provided.

  The seal body 120 is a member such as a gasket made of the same material as that of the seal body 20 of the leakage preventing device 1 shown in FIGS. 1 to 3, and the two split seals 121 and 122 curved in a semi-ellipse shape are formed into an oval shape. It is configured by combining in an annular shape. The split seals 121 and 122 have their edges projecting outward in a combined state, and the cover main body 110 is split by sandwiching the edges between the side edge flanges 1111a and 1112a of the split covers 1111 and 1112. The surface is sealed.

  The frame body 130 is formed so as to surround the cover body 110 with a space therebetween. A plurality of through screw holes into which the pressing bolts 140 are screwed are formed in the frame body 130 at substantially equal intervals along the circumferential direction. Between the front end portion of the pressing bolt 140 and the cover main body 110, a band-shaped contact member 141 having a width (height) substantially the same as the width (height) of the seal body 120 is interposed. A part of the plurality of pressing bolts 140 abuts on the flanges 1111a and 1112a and presses the seal body 120 via the flanges 1111a and 1112a.

  Since the seal body 120 in the flow path body 150 has an elliptical shape similar to the opening shape of the maintenance hole 159, the linear shape of the seal body 120 is determined only by fastening the side edge flanges 1111a and 1112a of the divided covers 1111 and 1112. It is difficult to apply a sufficient compressive force to the part. According to the fluid leakage prevention tool 101 having the above-described configuration, the compression force similar to that of the arc portion can be applied to the linear portion of the seal body 120 by screwing the pressing bolt 140. Similar to the leakage prevention tool 1 shown in FIG. 3, the leakage of fluid to the outside of the cover body 110 can be reliably prevented. As described above, the leakage prevention tool of the present invention can reliably exert a compressive force on the entire seal body even when the shape of the seal body is non-circular.

DESCRIPTION OF SYMBOLS 1,101 Leakage prevention tool 10,110 Cover main body 11,12 Divided cover 1111,1112 Divided cover 15,115 Communication hole 20,120 Seal body 30,130 Frame body 40,140 Press bolt 41,141 Contact material 50,150 Flow Road

Claims (4)

A fluid leakage prevention device attached to the outer surface of the flow path body through which the fluid passes,
A cover body having a plurality of divided covers that can be connected to each other so as to cover the flow path body;
A seal body interposed between the flow path body and the cover body;
A frame having a plurality of through screw holes and surrounding the cover body along the seal body;
A plurality of pressing members whose front ends press the sealing body through the cover body by screwing into the through screw holes;
An annular contact member that is arranged so as to cover the cover body and abuts against the tip of the pressing member ;
The seal body is made of a material that is elastically deformed and / or plastically deformed by applying a pressing force,
The abutting material is a fluid leakage prevention tool using metal . The split cover has a semi-cylindrical shape with flanges on both side edges, and the cover main body is configured by fastening the flanges of the two split covers.
2. The fluid leakage preventer according to claim 1, wherein a part of the plurality of pressing members has the tip abutted against the flange and presses the seal body via the flange. 3. The fluid leakage preventing device according to claim 1, wherein the cover main body has a communication hole capable of communicating with the outside a collection space formed between the cover body and the outer surface of the flow path body when mounted on the flow path body. . The fluid leakage preventer according to claim 1 , wherein the seal body is made of expanded graphite or fluororesin.

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