JP5314991B2 - Flange joint leakage prevention device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flange joint leakage-preventive device surely preventing leakage in a flange joint. <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'; elastic members 6 arranged along outer peripheries of the flanges 3' in such a manner of fastening the leakage preventive member 5 from both sides thereof in the pipe axial direction; and an attachment member having a recession 7c' composed of an inner bottom surface 7a' opposed to the outer peripheral surfaces 3a' of the flanges 3' and inner wall surfaces 7b' opposed on both sides of the inner bottom surface 7a in the pipe axial direction, and storing the leakage preventive member 5 and the elastic members 6 in the recession 7c', and attached to the flanges 3'. The movement of the leakage preventive member 5 in the pipe axial direction is regulated by the elastic members 6 in the recession 7c' where the leakage preventive member 5 is stored together with the elastic members 6, and the abutting position is maintained. <P>COPYRIGHT: (C)2010,JPO&amp;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, for example, when there is a radial step between the outer peripheral surfaces of a pair of flanges due to the mounting state of flanges or dimensional tolerances of the flanges, such a step is used. Since it is difficult to attach the flange joint leakage prevention device to the predetermined flange in the circumferential direction, fluid leakage may occur between the flanges without holding the leakage prevention member at a predetermined position. there were.

  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 a flange joint.

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 pair of elastic members disposed along the outer periphery of each flange so as to be sandwiched from both sides in the tube axis direction of the leakage preventing member;
The inner bottom surface facing the outer peripheral surface of the pair of flanges, and a concave portion composed of inner wall surfaces facing the both sides in the tube axis direction of the inner bottom surface, both inner wall surfaces of the concave portion are A mounting member that is mounted so as to be positioned in the radial direction of the outer peripheral surface of the flange, and that is mounted on the pair of flanges by accommodating the leakage prevention member and the pair of elastic members in the concave portion;
The pair of elastic members includes independent ring-shaped members housed between the inner walls of the concave portion, and the leakage prevention member is disposed in the concave portion housed together with the pair of elastic members. The movement in the tube axis direction is restricted by the pair of elastic members, the inner bottom surface of the concave portion individually presses the leakage prevention member and the outer peripheral surfaces of the pair of elastic members, and the leakage prevention member acts on the pair of flanges. It is characterized in that the abutting position that abuts over is maintained.
According to this feature, the pair of elastic members are formed of independent ring-shaped members, and the leak prevention member is disposed in the concave portion of the mounting member accommodated together with the pair of elastic members, and the tube shaft is formed by the pair of elastic members. and movement of is restricted, by acting on the elastic force leakage preventing member of the elastic member, Ri Do that leakage preventing member is in close contact with the pair of flanges at the contact position, also in both of the concave portion Since both of the wall surfaces are mounted so as to be located in the radial direction of the outer peripheral surfaces of the pair of flanges, both inside of the concave portions attached so as to be positioned in the radial direction of the outer peripheral surfaces of the pair of flanges The elastic member housed between the wall surfaces will surely abut against the outer peripheral surface of the flange, and by using the reaction force generated by this abutment, the force to pinch the leakage preventing member in the tube axis direction will be strengthened because it is, Leakage in flange joints 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 pair of elastic members are formed to have a dimensional difference corresponding to a dimensional difference in the pipe radial direction of the pair of flanges so that the mounting member is attached to the pair of flanges substantially parallel to a pipe axis. It is a feature.
According to this feature, even if the pair of flanges has a dimensional difference in the pipe radial direction, the dimensional difference corresponding to the dimensional difference is formed so that the mounting member is attached to the pair of flanges substantially parallel to the pipe axis. With the pair of elastic members, the attachment member is attached to the pair of flanges so as to cancel the dimensional difference and substantially parallel to the tube axis, and leakage prevention at the flange joint can be maintained.

The flange joint leakage prevention device according to claim 3 of the present invention is the flange joint leakage prevention device according to claim 1 or 2,
The pair of elastic members has a larger elastic coefficient than the leakage preventing member.
According to this feature, since the pair of elastic members has a larger elastic coefficient than the leakage preventing member, the force with which the pair of elastic members pinch the leakage preventing member in the tube axial direction causes the leakage preventing member to It acts to bulge in the tube diameter direction, and the leakage preventing member can be in close contact with the pair of flanges.

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 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.

  Embodiment 1 of the present invention will be described with reference to the drawings. First, FIG. 1A is a partial cross-sectional view showing a state in which the flange joint leakage preventing apparatus according to Embodiment 1 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 cross-sectional view taken along line AA before the flange joint leakage preventing device is attached to the flange joint, and FIG. 3B is a diagram illustrating the state where the flange joint leakage preventing device is attached to the flange joint. It is AA sectional drawing shown. FIG. 4A is a cross-sectional view taken along the line B-B showing the state before the flange joint leakage preventing device is attached to the flange joint, and FIG. 4B shows the 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. 1A are the top, bottom, left and right sides of the flange joint leakage prevention device, the front side of the paper is the front side (front side) of the flange joint leakage prevention device, and the back side is the rear side of the flange joint leakage prevention device. 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. 4 (a) and 4 (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 a spacer 10 (see FIGS. 3A and 3B).

  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. The attachment covers 7 ′ and 7 ′ are attached to the pair of flanges 3 ′ and 3 ′ by pulling and engaging each other.

  Further, as shown in FIG. 4B, 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 directly 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. 4A, the leakage preventing member 5 is made of a flexible material having elasticity, and is arranged 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 '. The pair of elastic members 6 and 6 are formed in substantially the same shape so that the normal cross-sectional shape in a natural state that is not elastically deformed is substantially circular, and the elastic members 6 and 6 are formed in the flange 3 ′. , 3 'are arranged over the outer peripheral surfaces 3a', 3a ', the inner diameters of the elastic members 6, 6 are substantially the same as the outer diameters of the flanges 3', 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. 1 (b) and 3 (b), the spacer 10 is made of an elastic resin member having a substantially T-shape when viewed from the side, and is attached to the ends of the mounting covers 7 ′ and 7 ′. It spans and is disposed between the inner bottom surface 7a ′ and the leakage preventing member 5 and the elastic members 6 and 6.

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

  First, as shown in FIGS. 3 (a) and 4 (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 arranged so as to be spanned between the ends of the mounting covers 7 ′ and 7 ′ so as to be interposed between the inner bottom surface 7 a ′ and the leakage preventing member 5 and the elastic members 6 and 6. 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. 3A). By pulling ', 7' along the circumferential direction, a force in the inner diameter direction (see the white arrow in FIG. 4 (a)) acts on the mounting covers 7 ', 7', and the inside of the mounting cover 7 ' The bottom surface 7 a ′ presses the lower part of the spacer 10. By pressing the inner bottom surface 7a ', the lower portion of the spacer 10 is elastically deformed along the inner bottom surface 7a'.

  Further, by tightening the bolt 33 and the nuts 34 and 34, the mounting covers 7 ′ and 7 ′ are attracted to each other, and the lower portion of the spacer 10 is further elastically deformed along the inner bottom surface 7 a ′. The bottom surface of the lower portion comes into contact with the leakage preventing member 5 and the elastic members 6 and 6, and the lower portion of the spacer 10 presses the leakage preventing member 5 and the elastic members 6 and 6 toward the pair of flanges 3 ′ and 3 ′.

  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 white arrows in FIG. 3B), and the leakage preventing member 5 and the elastic members 6 and 6 The inner bottom surface 7a ′ and the bottom surface of the lower portion of the spacer 10 and the outer peripheral surfaces 3a ′ and 3a ′ of the flanges 3 ′ and 3 are crushed in the tube diameter direction, thereby preventing leakage in the concave portion 7c ′. 5 and the elastic members 6 and 6 are in close contact with the outer peripheral surfaces 3a ′ and 3a ′ of the flanges 3 ′ and 3 ′.

  In the state of FIG. 3B and FIG. 4B, 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.

  Further, as described above, the inner bottom surface is extended between the ends of the attachment member 7 of the split structure formed in an annular shape by being drawn and engaged along the circumferential direction of the pair of flanges 3 ′ and 3 ′. Since the spacer 10 interposed between 7a ′ and the leakage preventing member 5 is provided, the end portion of the mounting member 7 that is difficult to press the leakage preventing member 5 toward the pair of flanges 3 ′ and 3 ′ in the inner diameter 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 circumferentially applied to the pair of flanges 3 ′ and 3 ′. It can contact | abut over and can prevent the leak in the flange joint 3 reliably.

  As described above, in the flange joint leakage preventing apparatus 11 according to the first embodiment, the leakage preventing member 5 has a pair of elastic portions in the concave portion 7c ′ of the mounting member 7 accommodated together with the pair of elastic members 6 and 6. The movement in the tube axis direction is restricted by the members 6, 6, and the elastic force of the elastic members 6, 6 acts on the leakage prevention member 5, and the leakage prevention member 5 is in a pair of flange 3 ′, Since it comes close to 3 ', the leak in the flange joint 3 can be prevented reliably. In particular, there is a radial step between the outer peripheral surfaces 3a ′ and 3a ′ of the pair of flanges 3 ′ and 3 ′ due to the mounting state of the flanges 3 ′ and 3 ′ or the dimensional tolerances of the flanges 3 ′ and 3 ′. Even if it has occurred, the pair of elastic members 6 and 6 are appropriately elastically deformed so as to eliminate this step, so that the mounting member 7 is substantially deformed with respect to the outer peripheral surfaces 3a ′ and 3a ′ of the flanges 3 ′ and 3 ′. It is attached in parallel, and the leakage preventing member 5 is brought into close contact with the pair of flanges 3 ′ and 3 ′ in the circumferential direction, thereby preventing leakage at the flange joint 3.

  Next, Example 2 will be described below. In addition, about the same component as the component shown by Example 1, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  Example 2 will be described with reference to the drawings. FIG. 5A is a cross-sectional view illustrating a state before the flange joint leakage preventing device according to Example 2 is attached to the flange joint, and FIG. It is sectional drawing which shows the state in which the leak prevention apparatus was attached to the flange joint.

  As shown in FIG. 5A, the pipe diameter of the flange 43 ′ of the existing fluid pipe 41 and the pipe diameter of the flange 53 ′ of the existing fluid pipe 51 shorter than the pipe diameter of the flange 43 ′ are paired. The flange joint 63 is formed by being connected to face to face. That is, the pair of flanges 43 ′ and 53 ′ according to the second embodiment has a dimensional difference in the tube diameter direction and forms a step on the outer peripheral surface.

  Further, the pair of elastic members 46 ′ and 56 ′ are formed so that the normal cross-sectional shape in a natural state that is not particularly elastically deformed is substantially rectangular, and is sandwiched from both sides in the tube axis direction of the leakage preventing member 5. The elastic members 46 and 56 are disposed in the respective concave portions 7c ′.

  In addition, the pair of elastic members 46 and 56 of the second embodiment are formed to have different inner diameter dimensions and radial cross-sectional dimensions. Specifically, the inner diameter dimension of the elastic member 46 is shorter than the inner diameter dimension of the elastic member 56, and the radial sectional dimension of the elastic member 46 is longer than the radial sectional dimension of the elastic member 56. Has become a dimension. That is, the pair of elastic members 46 and 56 have a dimensional difference in the pipe radial direction between the pair of flanges 43 ′ and 53 ′ so that the attachment member 7 is attached to the pair of flanges 43 ′ and 53 ′ substantially parallel to the tube axis. It is formed in the dimension difference according to.

  Next, the attachment process of the flange joint leakage prevention device 21 will be described. As shown in FIG. 5A, the leakage prevention member 5 is hung on both flanges 3 ′ and 3 ′ as in the first embodiment. It arrange | positions over the circumferential direction so that it may contact | abut, it arrange | positions over the circumferential direction so that the elastic members 46 and 56 may be pinched | interposed from the both sides of the pipe-axis direction of the leakage prevention member 5, and the attachment member 7 is concave shape. It arrange | positions along the circumferential direction so that the leakage prevention member 5 and the elastic members 46 and 56 may be accommodated in part 7c '. Then, by tightening the bolts 33 and the nuts 34 and 34 facing each other, the adjacent mounting covers 7 'and 7' are attracted to each other, and are directed toward the mounting covers 7 'and 7' in the inner diameter direction (see white arrows in the figure). ) Acts, and the mounting cover 7 ′ presses the leakage preventing member 5 and the elastic members 6 and 6 in the inner diameter direction.

  Furthermore, as the mounting covers 7 ′ and 7 ′ are attracted to each other, as shown in FIG. 5B, the leakage preventing member 5 becomes the outer peripheral surfaces 43a ′ and 53a ′ of the flanges 43 ′ and 53 ′, and the mounting cover 7 The elastic member 46 is crushed by the inner bottom surface 7a and the inner wall surfaces 7b 'and 7b' of the mounting cover 7 'and the outer peripheral surface 43a' of the flange 43 ', the inner bottom surface 7a of the mounting cover 7', and the left side of the figure. The elastic member 56 is crushed by the inner wall surface 7b ′ of the mounting cover 7 ′, and the elastic member 56 has an outer peripheral surface 53a ′ of the flange 53 ′, an inner bottom surface 7a of the mounting cover 7 ′, and an inner wall surface 7b ′ on the right side of the mounting cover 7 ′. As a result, the leakage preventing member 5 is in close contact with the outer peripheral surfaces 43a 'and 53a' of the flanges 43 'and 53', and the elastic member 46 is in close contact with the outer peripheral surface 43a 'of the flange 43' and Sex member 56 is in close contact with 'the outer peripheral surface 53a' of the flange 53.

  In this way, even if the pair of flanges 43 ′ and 53 ′ have a dimensional difference in the pipe radial direction, the dimensions are such that the attachment member 7 is attached to the pair of flanges 43 ′ and 53 ′ substantially parallel to the pipe axis. By a pair of elastic members 46 and 56 formed with a dimensional difference corresponding to the difference, the mounting member 7 is attached to the pair of flanges 43 ′ and 53 ′ so as to cancel the dimensional difference and substantially parallel to the tube axis. Leakage prevention at the joint 63 can be maintained.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  In the first and second embodiments, the existing fluid pipes 1, 1, 41, and 51 are clean water, but the fluid is not limited to clean water, and may be industrial water, for example. Also, it can be applied to a fluid pipe through which a fluid in a gas or gas-liquid mixed state flows.

  In the first and second embodiments, the normal cross-sectional shape of the leakage preventing member 5 in the natural state is substantially circular. For example, the normal cross-sectional shape of the leakage preventing member 5 in the natural state is substantially rectangular. May be formed.

  Further, in the first embodiment, the normal cross-sectional shape of the elastic members 6 and 6 in the natural state is substantially circular. For example, the normal cross-sectional shape of the elastic member in the natural state is formed in a substantially rectangular shape. May be. Similarly, in the second embodiment, the normal cross-sectional shape of the elastic members 46 and 56 in the natural state is substantially rectangular. For example, the normal cross-sectional shape of the elastic member in the natural state is different from each other in cross-sectional diameter. It may be formed in a substantially circular shape.

  In the first and second embodiments, the elastic members 6, 6, 46, and 56 have a larger elastic coefficient than that of the leakage preventing member 5. You may comprise from the material which has the same elastic modulus as a member.

  In the first embodiment, the elastic members 6 and 6 are arranged over the outer peripheral surfaces 3a ′ and 3a ′ of the flanges 3 ′ and 3 ′. In the second embodiment, the elastic member 46 is used. , 56 are arranged over the outer peripheral surfaces 43a ′, 53a ′ of the flanges 43 ′, 53 ′. For example, a plurality of elastic members are provided on the outer peripheral surface of the flange along the circumferential direction. It may be arranged at intervals.

(A) is a partial cross section figure which shows the state by which the flange joint leak prevention apparatus in Example 1 of this invention was installed in the fluid pipe | tube, (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 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 Example 2 is attached to a flange joint, (b) shows the state where the flange joint leak prevention apparatus was attached to the flange joint. It is sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Existing fluid pipe 3 Flange joint 3 'Flange 3a' Outer peripheral surface 4 Packing 5 Leakage prevention member 6 Elastic member 7 Mounting member 7a 'Inner bottom surface 7b' Inner wall surface 7c 'Concave part 9 Positioning part 11 Flange joint leak prevention apparatus 21 Flange joint Leakage prevention device 41 Existing fluid pipe 43 ′ flange 43a ′ outer peripheral surface 46 elastic member 51 Existing fluid pipe 53 ′ flange 53a ′ outer peripheral surface 56 elastic member 63 flange joint

Claims (4)

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 pair of elastic members disposed along the outer periphery of each flange so as to be sandwiched from both sides in the tube axis direction of the leakage preventing member;
The inner bottom surface facing the outer peripheral surface of the pair of flanges, and a concave portion composed of inner wall surfaces facing the both sides in the tube axis direction of the inner bottom surface, both inner wall surfaces of the concave portion are A mounting member that is mounted so as to be positioned in the radial direction of the outer peripheral surface of the flange, and that is mounted on the pair of flanges by accommodating the leakage prevention member and the pair of elastic members in the concave portion;
The pair of elastic members includes independent ring-shaped members housed between the inner walls of the concave portion, and the leakage prevention member is disposed in the concave portion housed together with the pair of elastic members. The movement in the tube axis direction is restricted by the pair of elastic members, the inner bottom surface of the concave portion individually presses the leakage prevention member and the outer peripheral surfaces of the pair of elastic members, and the leakage prevention member acts on the pair of flanges. A flange joint leakage preventing device, characterized in that the abutting position that abuts over is maintained.   The pair of elastic members are formed to have a dimensional difference corresponding to a dimensional difference in the pipe radial direction of the pair of flanges so that the mounting member is attached to the pair of flanges substantially parallel to a pipe axis. The flange joint leakage preventing apparatus according to claim 1, wherein   The flange joint leakage prevention device according to claim 1 or 2, wherein the pair of elastic members has a larger elastic coefficient than the leakage prevention member. The flange joint leakage according to any one of claims 1 to 3 , 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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