JP2010090977A - Flange joint leakage-preventive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flange joint leakage-preventive device surely preventing leakage in a flange joint along a peripheral direction. <P>SOLUTION: The flange joint leakage-preventive device includes: an elastic leakage-preventive member 5 arranged in an abutting position to be abutted along flanges 3'; and an attachment member 7 having a recession composed of an inner bottom surface 7a' opposed to outer peripheral surfaces 3a' of the flanges 3' and inner wall surfaces opposed on both sides of the inner bottom surface 7a in the pipe axial direction, and storing the leakage preventive member 5 in the recession 7c', and attached to the flanges 3'. The attachment member 7 is composed of an attachment cover 7' divided into four along the peripheral direction of the flanges 3', and is attached to the flanges 3' by pulling and fitting ends of the adjacent attachment cover 7', and a spacer 10 is provided which is suspended on the ends of the attachment cover 7' and is interposed between the inner bottom surface 7a' and the leakage preventive member 5 and pushes the leakage preventive member 5 toward the flanges 3'. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a flange joint leakage prevention device that seals over the outer periphery of a flange joint of an existing fluid pipe in which a pair of opposed flanges are connected via packing, and prevents leakage at the flange joint.

  The conventional flange joint leakage prevention device is used to prevent leakage of existing fluid pipes in an uninterrupted flow state when an existing flange joint deteriorates due to long-term use or the like and internal fluid may leak. The device comprises a leakage prevention member formed on the ring body, and an attachment member whose inner surface is held along the outer surface of the leakage prevention member along the circumferential direction, on the outer surface of the joint portion of the existing fluid pipe Leakage is prevented in the circumferential direction (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-351468 (2nd page, FIG. 4)

  However, in Patent Document 1, the mounting member is composed of divided members that are divided in the circumferential direction, and by pressing the adjacent divided members together with a stopper, a pressing force in the inner diameter direction is applied to the leakage preventing member. However, at the end portion between the adjacent divided members, there is a possibility that fluid may leak from between the flanges because sufficient pressing force cannot be applied to the leakage preventing member even by tightening the stopper. .

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide a flange joint leakage prevention device that reliably prevents leakage in the flange joint in the circumferential direction.

In order to solve the above-described problem, a flange joint leakage preventing device according to claim 1 of the present invention provides:
A flange joint leakage prevention device that seals over the outer periphery of a flange joint of an existing fluid pipe connected by a pair of opposed flanges via packing, and prevents leakage in the flange joint,
A leakage preventing member having elasticity disposed at a contact position that contacts the pair of flanges;
A concave portion including an inner bottom surface facing the outer peripheral surface of the pair of flanges and an inner wall surface facing the both sides of the inner bottom surface in the tube axis direction, and the leakage preventing member is accommodated in the concave portion and the pair And a mounting member attached to the flange of
The mounting member is composed of a divided member divided into a predetermined number in the circumferential direction of the pair of flanges, and is attached to the pair of flanges by pulling and engaging the ends of the adjacent divided members.
A spacer is provided between the end portions of the split member and interposed between at least the inner bottom surface and the leakage prevention member, and presses the leakage prevention member toward the pair of flanges. It is said.
According to this feature, at least the inner bottom surface and the leakage preventing member are spanned between the ends of the attachment members of the split structure formed in an annular shape by being drawn and engaged along the circumferential direction of the pair of flanges. Since there is a spacer interposed between them, at the end of the mounting member where it is difficult to press the leakage prevention member toward the pair of flanges in the inner diameter direction, the leakage prevention member faces the pair of flanges via the spacer. The leakage prevention member abuts against the pair of flanges in the circumferential direction, and leakage at the flange joint can be reliably prevented.

The flange joint leakage prevention device according to claim 2 of the present invention is the flange joint leakage prevention device according to claim 1,
The spacer is formed with a bulging surface that gradually bulges in a radial direction toward a facing portion where the adjacent divided members face each other.
According to this feature, the spacer is formed with a bulging surface that gradually bulges in the radial direction toward the facing portion of the split member, so that the leakage preventing member is hardly pressed toward the pair of flanges. Also in the portion, the leakage preventing member is reliably pressed toward the pair of flanges via the spacer.

The flange joint leakage prevention device according to claim 3 of the present invention is the flange joint leakage prevention device according to claim 2,
The bulging surface of the spacer is an inclined surface facing the inner bottom surface, and a tapered surface gradually tapered toward the facing portion corresponding to the inclined surface is formed on the inner bottom surface. Yes.
According to this feature, the bulging surface of the spacer is an inclined surface that faces the inner bottom surface, and the inner bottom surface is formed with a gradually tapered taper surface corresponding to the inclined surface. The pulling force that pulls in the circumferential direction can be used as a pressing force that gradually presses the leakage preventing member toward the pair of flanges in the inner diameter direction by sliding contact between the inclined surface and the tapered surface.

A flange joint leakage prevention device according to claim 4 of the present invention is the flange joint leakage prevention device according to any one of claims 1 to 3,
The spacer is formed with a protruding portion protruding in the outer diameter direction from between the adjacent divided members.
According to this feature, when engaging the divided members by using the protruding portions protruding in the outer diameter direction between the adjacent divided members, the arrangement positions of the spacers provided between the end portions are appropriately set. Can be adjusted.

A flange joint leakage prevention device according to claim 5 of the present invention is the flange joint leakage prevention device according to any one of claims 1 to 4,
The mounting member is provided with a positioning portion that sandwiches the pair of flanges from both outer sides and positions the mounting member in the tube axis direction.
According to this feature, the mounting member is positioned in the tube axis direction by the positioning portion that sandwiches the pair of flanges from both outer sides, and is securely mounted along the outer peripheral surface of the flange.

  Examples of the present invention will be described below.

  An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1A is a partial cross-sectional view showing a state where a flange joint leakage preventing device according to an embodiment of the present invention is installed in a fluid pipe. b) is a sectional side view of (a). Fig.2 (a) is a front view which shows an attachment cover, (b) is a sectional side view of (a). FIG. 3A is a front view showing the spacer, and FIG. 3B is a side view showing the spacer. FIG. 4A is a cross-sectional view taken along the line AA before the flange joint leakage preventing device is attached to the flange joint, and FIG. 4B is a state where the flange joint leakage preventing device is attached to the flange joint. It is AA sectional drawing shown. FIG. 5A is a cross-sectional view taken along the line BB before the flange joint leakage preventing device is attached to the flange joint, and FIG. 5B is a state where the flange joint leakage preventing device is attached to the flange joint. It is a BB sectional view shown. In the following, the top, bottom, left, and right sides of FIG. The side (back side) will be described.

  As shown in FIGS. 1 (a) and 1 (b), reference numeral 1 denotes an existing fluid pipe that transports clean water from the upstream side to the downstream side, and is connected to the existing fluid pipes 1 and 1, respectively. Flanges 3 'and 3' are formed. The flanges 3 ′ and 3 ′ are inserted into a plurality of insertion holes formed along the circumferential direction through ring-shaped packings 4 in place of existing bolts and nuts, and are screwed together. The flange joint 3 is configured by joining with the bolt 31 and the nut 32 having the property. And the flange joint leak prevention apparatus 11 of this invention seals over the outer periphery of the flange joint 3, and the leak in the flange joint 3 is prevented now.

  The flange joint leakage prevention device 11 includes a leakage prevention member 5 disposed over a pair of flanges 3 ′ and 3 ′, and a pair of elastic members 6 disposed along the outer periphery of each flange 3 ′ and 3 ′. 6 (see FIGS. 5 (a) and 5 (b)), a mounting member 7 that accommodates the leakage preventing member 5 and the pair of elastic members 6 and 6 and is attached to the pair of flanges 3 ′ and 3 ′, and the mounting member 7 is attached to the pair of flanges 3 ′ and 3 ′, so that the leakage preventing member 5 and the pair of elastic members 6 and 6 are pressed against the outer peripheral surfaces of the pair of flanges 3 ′ and 3 ′ (in this embodiment, 4 And the spacer 10 (see FIGS. 4A and 4B).

  The mounting member 7 includes a mounting cover 7 ′ as a divided member divided into a predetermined number (four in this embodiment) in the circumferential direction of the pair of flanges 3 ′ and 3 ′, and is shown in FIG. Thus, this attachment cover 7 'is formed in a substantially circular arc shape, and attachment bodies 8, 8 are fixed to the outer surfaces of both ends. As shown in FIG. 2A, the mounting cover 7 ′ includes an inner bottom surface 7a ′ of the mounting cover 7 ′ facing the outer peripheral surfaces of the pair of flanges 3 ′ and 3 ′, and an inner bottom surface 7a ′. A concave portion 7c ′ is formed which includes inner wall surfaces 7b ′ and 7b ′ facing each other on both sides in the tube axis direction.

  As shown in FIGS. 1 (a) and 1 (b), four mounting covers 7 'are arranged so as to be substantially circular along the outer peripheral surfaces of the pair of flanges 3' and 3 ', and are adjacently mounted. In the bodies 8 and 8, the bolts 33 are inserted into the opposing through holes 8 a and 8 a, and the adjacent mounting bodies 8 and 8, that is, the end portions of the adjacent mounting covers 7 ′ and 7 ′ by the bolts 33 and the nuts 34. As shown in FIG. 4B, the mounting covers 7 ′ and 7 ′ are attached to the pair of flanges 3 ′ and 3 ′.

  As shown in FIGS. 1B, 2A, and 2B, the both ends of the inner bottom surface 7a ′ of the mounting cover 7 ′ correspond to the bulging surfaces 10c and 10c of the spacer 10 described later. Tapering surfaces 7e 'and 7e' that are gradually tapered toward the facing portions 7f 'and 7f' are formed.

  Further, as shown in FIG. 5B, in the state where the mounting covers 7 ′ and 7 ′ are attached to the pair of flanges 3 ′ and 3 ′, the inner wall surface 7b ′ on the left side of the concave portion 7c ′ is The right inner wall surface 7b 'of the concave portion 7c' is positioned immediately above the outer peripheral surface 3a 'of the right flange 3' in the drawing. Thus, the attachment covers 7 'are formed respectively. That is, both the inner wall surfaces 7b ′ and 7b ′ of the concave portion 7c ′ are within the radial region of the outer peripheral surfaces 3a ′ and 3a ′ of the pair of flanges 3 ′ and 3 ′ (see the dashed line region R in the drawing). It is formed so that it can be located and attached.

  As shown in FIG. 2 (a), a pair of flanges 3 'and 3' are sandwiched from both outsides on the left and right outer walls of the mounting cover 7 ', and the mounting member 7 is positioned in the tube axis direction. A plurality of sets of positioning portions 9 and 9 are formed. Further, as shown in FIGS. 1 (a), 1 (b) and 2 (a), the positioning portions 9 and 9 are formed with female screw holes 9a and 9a in which female screws are formed, respectively. When the mounting cover 7 'is attached to the outer peripheral surfaces 3a' and 3a 'of the flanges 3' and 3 ', the bolts 35 and 35 of the positioning portions 9 and 9 are screwed into the female screw holes 9a and 9a. 35 and 35 are in contact with the flanges 3 'and 3' and sandwich the pair of flanges 3 'and 3' from both outsides, whereby the mounting cover 7 'constituting the mounting member 7 is positioned in the tube axis direction, The flanges 3 ′ and 3 ′ are securely attached along the outer peripheral surfaces 3a ′ and 3a ′.

  As shown in FIG. 5A, the leakage preventing member 5 is made of a flexible material having elasticity, and is disposed in the concave portion 7c 'of the mounting cover 7'. Further, the leakage preventing member 5 is formed so that the normal cross-sectional shape in a natural state that is not elastically deformed becomes a substantially circular shape, and the leakage preventing member 5 has outer peripheral surfaces 3a ′ and 3a ′ of the flanges 3 ′ and 3 ′. In the state of being arranged over the inner diameter, the inner diameter of the leakage preventing member 5 is substantially the same as the outer diameter of the flanges 3 ′, 3 ′. The leakage preventing member 5 is not particularly illustrated, but is formed in a band-like shape before placement, and is endless such as bonding both ends of the leakage preventing member 5 in a state of being disposed on the outer peripheral surfaces 3a ′ and 3a ′. By performing the shape treatment, the leakage preventing member 5 is arranged over the outer peripheral surfaces 3a ′ and 3a ′ of the flanges 3 ′ and 3 ′.

  The elastic members 6 and 6 are made of a flexible material having elasticity, have an elastic coefficient larger than that of the leakage preventing member 5, and are recessed portions so as to be sandwiched from both sides in the tube axis direction of the leakage preventing member 5. 7c '. Further, the elastic members 6 and 6 are formed so that the normal cross-sectional shape in a natural state in which the elastic members 6 and 6 are not elastically deformed is substantially circular. In the state arranged over 3a ′, the inner diameters of the elastic members 6 and 6 are substantially the same as the outer diameters of the flanges 3 ′ and 3 ′. Although not shown in particular, the elastic members 6 and 6 are formed in a band-like shape before arrangement, and the elastic members 6 and 6 are bonded to each other in a state of being arranged on the outer peripheral surfaces 3a ′ and 3a ′. By performing endless processing such as causing the elastic members 6 and 6 to be disposed, the elastic members 6 and 6 are arranged over the outer peripheral surfaces 3a ′ and 3a ′ of the flanges 3 ′ and 3 ′.

  As shown in FIGS. 3 (a) and 3 (b), the spacer 10 is made of a resin member having a substantially T-shaped elasticity when viewed from the side and spans the ends of the mounting covers 7 ′ and 7 ′. The inner bottom surface 7a ′ is disposed between the leakage preventing member 5 and the elastic members 6 and 6 (see FIG. 4B).

  The spacer 10 will be specifically described. The spacer 10 includes a pressing portion 10a that presses the leakage prevention member 5 and the pair of elastic members 6 and 6 against the outer peripheral surfaces 3a 'and 3a' of the pair of flanges 3 'and 3'; And a protruding portion 10b formed to protrude in the outer diameter direction from the center position of the pressing portion 10a (see FIG. 4A). In the state where the flange joint leakage prevention device 11 is attached over the outer periphery of the flange joint 3, the spacer 10 has a pressing portion 10 a between the inner bottom surface 7 a ′ and the leakage prevention member 5 and the elastic members 6, 6. The projection 10b is positioned between the inner wall surfaces 7b 'and 7b' and between the bolts 33 and 33 inserted into the through holes 8a and 8a of the mounting body 8 (FIG. 5). (See (a)).

  As shown in FIG. 3 (b), in the central portion of the pressing portion 10a, the adjacent mounting covers 7 'and 7' bulge gradually in the radial direction toward the facing portions 7f 'and 7f' facing each other. Two bulging surfaces 10c, 10c are formed on the left and right sides of the protruding portion 10b. In particular, the bulging surfaces 10c, 10c are inclined surfaces that are substantially linear in a side view and face the tapered surface 7e 'at both ends of the inner bottom surface 7a of the mounting cover 7'.

  Next, the mounting process of the flange joint leakage preventing apparatus 11 will be described.

  First, as shown in FIGS. 4 (a) and 5 (a), the leakage preventing member 5 is arranged over the circumferential direction so as to be in contact with both flanges 3 ′ and 3 ′ and is elastic. The members 6 and 6 are arranged over the circumferential direction so as to be sandwiched from both sides of the leakage preventing member 5 in the tube axis direction. Next, the mounting member 7 is disposed along the circumferential direction so as to accommodate the leakage preventing member 5 and the elastic members 6 and 6 in the concave portion 7c '. Further, the spacer 10 is interposed between the inner bottom surface 7a ′, the leakage preventing member 5 and the elastic members 6 and 6, with the pressing portion 10a spanning the ends of the mounting covers 7 ′ and 7 ′, and the protruding portion. It arrange | positions so that 10b may be located between the attachment covers 7 'and 7' which adjoined, ie, between opposing part 7f 'and 7f'. The arrangement position of the leakage preventing member 5 is defined as a contact position. As shown in FIG. 1B, the attachment member 7 is assembled in a substantially circular shape by engaging the adjacent attachment bodies 8 and 8 with bolts 33 and nuts 34.

  Next, the bolts 33 and the nuts 34 and 34 facing each other are fastened, so that the adjacent mounting covers 7 'and 7' are attracted to each other (see the white arrow in FIG. 4A). By pulling ', 7' along the circumferential direction, a force in the inner diameter direction (see the white arrow in FIG. 5 (a)) acts on the mounting covers 7 ', 7', and the inside of the mounting cover 7 ' The bottom surface 7a ′ presses the pressing portion 10a. By pressing the inner bottom surface 7a ', the pressing portion 10a is elastically deformed along the inner bottom surface 7a'.

  Here, the spacer 10 is formed with a protruding portion 10b protruding in the outer diameter direction from between the adjacent mounting covers 7 ′ and 7 ′, so that the mounting cover 7 ′ can be utilized by using the protruding portion 10b. , 7 'can be appropriately adjusted in the arrangement position of the spacer 10 provided between the ends.

  Further, by tightening the bolt 33 and the nuts 34, 34, the tapered surfaces 7e ', 7e' of the mounting covers 7 ', 7' are in sliding contact with the bulging surfaces 10c, 10c, so that the mounting covers 7 ', 7' Are pressed together, and the pressing portion 10a is further elastically deformed along the inner bottom surface 7a '. The bottom surface of the pressing portion 10a comes into contact with the leakage preventing member 5 and the elastic members 6 and 6, and the pressing portion 10a becomes the leakage preventing member 5. The elastic members 6 and 6 are pressed toward the pair of flanges 3 ′ and 3 ′. By the pressing of the pressing portion 10a, the leakage preventing member 5 and the elastic members 6 and 6 are elastically deformed. In this way, the tapered surfaces 7e ′ and 7e ′ of the mutual mounting covers 7 ′ and 7 ′ are brought into sliding contact with the bulging surfaces 10c and 10c, and the mounting covers 7 ′ and 7 ′ are pulled toward each other, whereby the tapered surface 7e ′. , 7e ′ and the bulging surfaces 10c, 10c are in contact with each other gradually, so that the pressing portion 10a presses the leakage preventing member 5 and the elastic members 6, 6 in the inner diameter direction without the spacer 10 being displaced. .

  Similarly, when the mounting covers 7 ′ and 7 ′ are attracted to each other, as shown in FIGS. 3B and 4B, the mounting covers 7 ′ and 7 at locations other than the installation location of the spacer 10 are provided. The inner bottom surfaces 7a 'and 7a' also press the leakage preventing member 5 and the elastic members 6 and 6 in the inner diameter direction (see the white arrow in FIG. 4B), and the leakage preventing member 5 and the elastic members 6 and 6 The inner bottom surface 7a ′ and the bottom surface of the pressing portion 10a and the outer peripheral surfaces 3a ′ and 3a ′ of the flanges 3 ′ and 3 are crushed in the tube radial direction, thereby causing the leakage preventing member 5 in the concave portion 7c ′. The elastic members 6 and 6 are in close contact with the outer peripheral surfaces 3a ′ and 3a ′ of the flanges 3 ′ and 3 ′.

  Therefore, in the concave portion 7c ′ of the mounting member 7 in which the leakage preventing member 5 is accommodated together with the pair of elastic members 6 and 6, the movement in the tube axis direction is restricted by the pair of elastic members 6 and 6, and this elastic member The elastic force of 6 and 6 acts on the leakage preventing member 5 so that the leakage preventing member 5 comes into close contact with the pair of flanges 3 ′ and 3 ′ at the contact position, thereby reliably preventing leakage at the flange joint 3. it can.

  In the state of FIG. 4B and FIG. 5B, as described above, both the inner wall surfaces 7b ′ and 7b ′ of the concave portion 7c ′ are the outer peripheral surfaces 3a of the pair of flanges 3 ′ and 3 ′. Since it is located in the radial direction of ', 3a', a force in the inner diameter direction acts on the mounting covers 7 ', 7', so that the outer peripheral surfaces 3a ', 3a' of the pair of flanges 3 ', 3' Elastic members 6 and 6 accommodated between both inner wall surfaces 7b 'and 7b' of the concave portion 7c 'mounted so as to be positioned in the radial direction are outer peripheral surfaces 3a' and 3a of the flanges 3 'and 3'. The leakage preventing member 5 is reliably abutted without being disengaged and the movement of the leakage preventing member 5 is restricted by the elastic members 6, 6, and the leakage preventing member 5 is moved in the tube axis direction by utilizing the reaction force generated by this contact. The clamping force can be increased.

  Further, as described above, since the pair of elastic members 6 and 6 have a larger elastic coefficient than the leakage preventing member 5, a force in the inner diameter direction acts on the mounting covers 7 ′ and 7 ′. The inner wall surfaces 7b 'and 7b' of the mounting cover 7 'press the pair of elastic members 6 and 6, and the force with which the pair of elastic members 6 and 6 pinch the leakage preventing member 5 in the tube axis direction is the leakage preventing member. 5 acts so as to bulge out in the tube diameter direction (inner diameter direction), so that the leakage preventing member 5 can be in close contact with the pair of flanges.

  The spacer 10 is disposed between the inner bottom surface 7a ′ and the leakage prevention member 5 and the elastic members 6 and 6, and the mounting cover 7 ′ and 7 ′ adjacent to each other is opposed to the spacer 10. Since the bulging surfaces 10c and 10c that gradually bulge in the radial direction toward the opposed portions 7f ′ and 7f ′ are formed, it is difficult to gradually press the leakage preventing member 5 toward the pair of flanges 3 ′ and 3 ′. In the vicinity of the opposing portions 7f ′ and 7f ′, the leakage preventing member 5 is also connected to the spacer 10 in the same manner as the leakage preventing member 5 is pressed in other locations except for the locations in the vicinity of the opposing portions 7f ′ and 7f ′. It is surely pressed toward the pair of flanges 3 ′ and 3 ′ via the. In particular, since the leakage preventing member 5 is disposed between the elastic members 6 and 6 in the tube axis direction, even if the spacer 10 is pressed, it is pressed in the inner diameter direction without expanding in the tube axis direction. It will be.

  In particular, as described above, the bulging surface 10c of the spacer 10 is an inclined surface facing the inner bottom surface 7a ', and the inner bottom surface 7a' is gradually tapered toward the facing portion 7f 'corresponding to the bulging surface 10c. Since the tapered surface 7e 'is formed, the pulling force that draws the ends of the mounting covers 7' and 7 'along the circumferential direction is gradually increased by the sliding contact between the bulging surface 10c and the tapered surface 7e'. Further, the leakage preventing member 5 can be used as a pressing force for pressing the leakage preventing member 5 toward the pair of flanges 3 ′ and 3 ′ in the inner diameter direction.

  As described above, in the flange joint leakage preventing apparatus 11 according to the embodiment, the split structure mounting member is formed in an annular shape by being drawn and engaged along the circumferential direction of the pair of flanges 3 ′ and 3 ′. 7 is provided with a spacer 10 interposed between the inner bottom surface 7a ′ and the leakage preventing member 5, so that the leakage preventing member 5 has an inner diameter facing the pair of flanges 3 ′ and 3 ′. At the end of the mounting member 7 that is difficult to press in the direction, the leakage preventing member 5 is pressed in the inner diameter direction toward the pair of flanges 3 ′ and 3 ′ via the spacer 10, and the leakage preventing member 5 is a pair. The flange joints 3 ′ and 3 ′ are in contact with each other in the circumferential direction, and leakage at the flange joint 3 can be reliably prevented.

  Next, modifications of the present invention will be described below. It should be noted that the same components as those shown in the above-described embodiment are denoted by the same reference numerals and redundant description is omitted.

  A modification of the present invention will be described with reference to the drawings. FIG. 6A is a cross-sectional view showing a state before the flange joint leakage preventing device according to the modification is attached to the flange joint, and FIG. It is sectional drawing which shows the state in which the joint leak prevention apparatus was attached to the flange joint.

  As shown in FIG. 6A, the inner bottom surface 17a 'of the mounting cover 17' is formed in a substantially arc shape that continues in the circumferential direction to the end surface that forms the facing portion 17f '.

  Even in this case, when the flange joint leakage preventing device 21 is attached to the flange joint 3, the adjacent attachment covers 17 ′ and 17 ′ are attracted to each other by fastening the bolt 33 and the nuts 34 and 34. As shown in FIG. 6B, the apex 17g ′ where the end surface forming the facing portion 17f ′ and the inner bottom surface 17a ′ on the facing portion 17f ′ side intersect is inclined as shown in FIG. 6B. In order to contact the bulging surface 10c, which is a surface, the leakage preventing member 5 and the elastic members 6 and 6 are pressed toward the pair of flanges 3 'and 3' in the inner diameter direction by contacting the bulging surface 10c and the apex 17g '. can do. Thereby, the leak in the flange joint 3 can be prevented reliably.

  Although the embodiments and modifications of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments and modifications, and there are changes and additions within the scope not departing from the gist of the present invention. Is included in the present invention.

  In the embodiment and the modified example, the existing fluid pipes 1 and 1 have the water flowing therein as the fluid, but the fluid is not limited to the water, and may be, for example, industrial water or gas. It can also be applied to a fluid pipe through which fluid in a gas-liquid mixed state flows.

  In the modified example, the leakage preventing member 5 and the elastic members 6 and 6 are arranged along the outer circumferences of the flanges 3 ′ and 3 ′. However, the flange joint leakage preventing device is limited to the one including the elastic member. For example, a flange joint leakage prevention device in which only the leakage prevention member is disposed along the outer periphery of each flange may be used.

  In the said Example and the said modification, although the attachment member 7 consists of attachment cover 7 ', 17' as a division member divided | segmented into four, the division | segmentation number of an attachment member is limited to four Instead, the attachment member may be composed of divided members divided into two, three, five or more.

  In the above-described embodiment, the bulging surface 10c is a linear inclined surface, but is not limited thereto. For example, the bulging surface is a curved surface that gradually bulges in the radial direction toward the facing portion of the mounting cover. It may be.

(A) is a partial cross section figure which shows the state in which the flange joint leak prevention apparatus in the Example of this invention was installed in the fluid pipe, (b) is a sectional side view of (a). (A) is a front view which shows an attachment cover, (b) is a sectional side view of (a). (A) is a front view which shows a spacer, (b) is a side view which shows a spacer. (A) is AA sectional drawing which shows the state before a flange joint leak prevention apparatus is attached to a flange joint, (b) is A which shows the state where the flange joint leak prevention apparatus was attached to the flange joint. It is -A sectional drawing. (A) is BB sectional drawing which shows the state before a flange joint leak prevention apparatus is attached to a flange joint, (b) is B which shows the state where the flange joint leak prevention apparatus was attached to the flange joint. It is -B sectional drawing. (A) is sectional drawing which shows the state before the flange joint leak prevention apparatus in a modification is attached to a flange joint, (b) is a cross section which shows the state where the flange joint leak prevention apparatus was attached to the flange joint FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing fluid pipe 3 Flange joint 3 'Flange 3a' Outer peripheral surface 4 Packing 5 Leak prevention member 7 Mounting member 7 'Mounting cover (divided member)
7a 'Inner bottom surface 7b' Inner wall surface 7c 'Concave portion 7e' Tapered surface 7f 'Opposing portion 9 Positioning portion 10 Spacer 10b Protruding portion 10c Swelling surface (inclined surface)
11 Flange joint leakage prevention device

Claims (5)

A flange joint leakage prevention device that seals over the outer periphery of a flange joint of an existing fluid pipe connected by a pair of opposed flanges via packing, and prevents leakage in the flange joint,
A leakage preventing member having elasticity disposed at a contact position that contacts the pair of flanges;
A concave portion including an inner bottom surface facing the outer peripheral surface of the pair of flanges and an inner wall surface facing the both sides of the inner bottom surface in the tube axis direction, and the leakage preventing member is accommodated in the concave portion and the pair And a mounting member attached to the flange of
The mounting member is composed of a divided member divided into a predetermined number in the circumferential direction of the pair of flanges, and is attached to the pair of flanges by pulling and engaging the ends of the adjacent divided members.
A spacer is provided between the end portions of the split member and interposed between at least the inner bottom surface and the leakage prevention member, and presses the leakage prevention member toward the pair of flanges. The flange joint leakage prevention device.   2. The flange joint leakage preventing device according to claim 1, wherein a bulge surface that gradually bulges in a radial direction toward a facing portion where the adjacent divided members face each other is formed on the spacer.   The bulging surface of the spacer is an inclined surface facing the inner bottom surface, and a tapered surface gradually tapered toward the facing portion corresponding to the inclined surface is formed on the inner bottom surface. The flange joint leakage preventing device according to claim 2.   The flange joint leakage preventing device according to any one of claims 1 to 3, wherein the spacer is formed with a protruding portion protruding in an outer diameter direction from between the adjacent divided members.   The flange joint leakage according to any one of claims 1 to 4, wherein the mounting member is provided with a positioning portion that sandwiches the pair of flanges from both outer sides and positions the mounting member in the tube axis direction. Prevention device.

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