JP5468370B2 - Anticorrosion sleeve - Google Patents

Description

  The present invention relates to an anticorrosion sleeve for preventing corrosion of a perforated portion of a metal fluid pipe.

  Some conventional anticorrosion sleeves are inserted into the perforated portion of a metal fluid pipe, and the perforated portion is anticorrosive by bringing the outer peripheral surface of the anticorrosive sleeve into contact with the inner peripheral surface of the perforated portion (for example, Patent Document 1).

No. 7-41993 (2nd page, Fig. 4)

  However, in Patent Document 1, the peripheral surface portion of the anticorrosion sleeve after passing through the perforated portion is brought into contact with the inner peripheral surface of the perforated portion by expanding the diameter by means of a diameter expanding means prepared separately. Therefore, there is a problem that the work of expanding the diameter by the diameter expanding means is required to prevent corrosion of the perforated portion.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide an anticorrosion sleeve capable of preventing corrosion of a perforated portion without requiring extra work.

In order to solve the above problems, the anticorrosion sleeve of the present invention comprises:
An anti-corrosion sleeve for preventing corrosion of a perforated portion of a metal fluid pipe, the tubular body inserted through the perforated portion, and an outer peripheral side of the tubular body that is in contact with the inner peripheral surface of the perforated portion The anti-corrosion part,
The anticorrosive portion has elasticity in a large diameter than the perforations in the natural state, it is pressed to contact with the inner peripheral surface of the perforated portion of the elastic return force as a pressing force,
The cylindrical body has a distal end portion that passes through the perforated portion and is disposed in the fluid pipe. The distal end portion has elasticity, and a distal end surface of the distal end portion has a curved shape of the perforated portion. A tapered surface formed with a gradually larger diameter than the perforated part from the front edge having a smaller diameter than the perforated part toward the anticorrosive part side. the has is characterized in that have a positioning mark for aligning the curved shape of the tip portion of the tubular body in a curved shape of the perforations.
According to this feature, simply by inserting the cylindrical body of the anticorrosion sleeve into the perforated portion of the metal fluid pipe, the elastic return force of the anticorrosive portion is used as a pressing force to press and contact the inner peripheral surface of the perforated portion. Therefore, the anticorrosion can be ensured over the inner peripheral surface of the perforated part reliably and without any effort.
And since the front-end | tip part of the cylindrical body penetrated by the perforation part is arrange | positioned in a fluid pipe | tube along the curved surface shape of a perforation part, it can ensure without eroding the flow-path area | region in a fluid pipe, and a cylindrical shape The front end surface of the body is formed in a substantially flat shape, so that the cylindrical body can be applied regardless of the diameter of the fluid pipe, etc., and versatility is enhanced, and the structure that makes it easy to manufacture the cylindrical body at low cost It has become. Furthermore, the tip portion has elasticity, and has a tapered surface formed with a gradually larger diameter than the piercing portion from the tip edge having a smaller diameter than the piercing portion toward the anticorrosion portion. By sliding the taper surface of the part into the perforated part, the anticorrosion sleeve can be positioned relative to the perforated part, and the anticorrosive part side of the tip part is elastically bent in the direction of diameter reduction and passes through the perforated part, and elastically restored after passing. By doing so, it is possible to prevent the cylindrical body inserted through the perforated part from coming off.

The anticorrosion sleeve of the present invention is
The said anticorrosion part is provided in the outer peripheral surface of the said cylindrical body whose rigidity is larger than this anticorrosion part, It is characterized by the above-mentioned.
According to this feature, the anticorrosion part can generate an elastic restoring force toward the inner peripheral surface of the perforated part by using the outer peripheral surface of the cylindrical body having higher rigidity as a reaction force.

The anticorrosion sleeve of the present invention is
The cylindrical body has a rear end portion having a diameter larger than that of the perforated portion.
According to this feature, excessive insertion of the anticorrosion sleeve can be prevented by bringing the rear end portion of the cylindrical body into contact with the outer surface of the fluid pipe around the perforated portion.

(A) is a partially broken front view of the anticorrosion sleeve in Example 1, (b) is also a partially broken side view, and (c) is a bottom view. (A) is sectional drawing which shows the state which has inserted the anti-corrosion sleeve in Example 1, (b) is AA sectional drawing of (a). (A) is sectional drawing which shows the state which inserted the anti-corrosion sleeve in Example 1, (b) is BB sectional drawing of (a). (A) is a partially broken front view of the anticorrosion sleeve in Example 2, (b) is also a bottom view. (A) is sectional drawing which shows the state which has inserted the anti-corrosion sleeve in Example 2, (b) is CC sectional drawing of (a). (A) is sectional drawing which shows the state which inserted the anti-corrosion sleeve in Example 2, (b) is DD sectional drawing of (a).

  EMBODIMENT OF THE INVENTION The form for implementing the anti-corrosion sleeve which concerns on this invention is demonstrated below based on an Example.

  The anticorrosion sleeve 10 according to the first embodiment will be described with reference to FIGS. 1 to 3.

  As shown in FIGS. 1A to 1C and FIGS. 2A and 2B, the anticorrosion sleeve 10 is a metal fluid pipe 1 (hereinafter abbreviated as a fluid pipe 1) as described later. It is a sleeve used for anticorrosion of the perforated part 2 which perforated the wall, Comprising: The cylindrical body 11 which has the surrounding surface continuous over the circumferential direction, and the anticorrosion part 12 located in the outer peripheral side of this cylindrical body 11 And is composed of. The anticorrosion part 12 is made of a relatively soft resin material such as polyethylene, for example, on the outer peripheral surface of the cylindrical body 11 made of a resin material that is the same kind or different from the resin material and harder than the anticorrosion part 12, It is bonded by an adhesive member (not shown). In addition, the anticorrosion part may be heat-welded, for example to the outer peripheral surface of a cylindrical body.

  As shown in FIGS. 1A to 1C and FIGS. 3A and 3B, more specifically, the cylindrical body 11 passes through the perforated part 2 and is disposed inside the fluid pipe 1. This is an inner cylindrical body having a substantially circular shape in plan view, which includes a distal end portion 13, a barrel portion 14 extending continuously from the distal end portion 13, and a rear end portion 15 further continuing to the barrel portion 14.

  The anticorrosion part 12 bonded over the outer peripheral surface of the body part 14 has a larger diameter and elasticity than the perforated part 2 in its natural state, and is more easily elastically deformed than the cylindrical body 11 having elasticity. Is formed. In addition, about the thickness of the radial direction of the trunk | drum 14 or the anticorrosion part 12, it is not necessarily restricted to the thickness shown in figure, For example, in order to ensure the elastic deformation allowance of an anticorrosion part, an anticorrosion part is diameter rather than a trunk | drum. It may be formed thick in the direction.

  The distal end portion 13 of the cylindrical body 11 has a curved distal end surface 13 a so as to follow the curved surface shape of the perforated portion 2 formed in the fluid pipe 1. More specifically, the distal end surface 13 a is formed in a curved surface shape having substantially the same curvature as the inner peripheral surface 3 a of the fluid pipe 1. Moreover, the front-end | tip part 13 has the taper surface 13b formed in the natural state gradually larger diameter than the punching part 2 toward the anti-corrosion part 12 side from the front-end | tip edge of a diameter smaller than the punching part 2. FIG.

  Further, the rear end portion 15 of the cylindrical body 11 is formed to have a larger diameter than the anticorrosion portion 12 bonded to the body portion 14, that is, sufficiently larger than the perforated portion 2. Further, at two predetermined locations on the outer peripheral surface of the rear end portion 15 that oppose each other, more specifically, at the location of the rear end portion 15 corresponding to the extended portion extending forward in the axial direction at the front end portion of the curved surface shape, A groove portion 16 is formed as a mark portion of the extended portion. In addition, the mark part may be formed in the location of the rear-end part 15 equivalent to the curved location curved to the back of the most axial direction in the front-end | tip part of a curved surface shape, for example.

  Next, the insertion of the anticorrosion sleeve 10 into the perforated portion 2 will be described.

  As shown in FIGS. 2 (a) and 2 (b), the fluid pipe 1 is a water pipe through which clean water circulates, and a part of the pipe wall having a curved surface in the circumferential direction in a sealed housing (not shown). Are perforated by a well-known perforating means (not shown) to form a perforated portion 2 opened in a substantially circular shape in a direction substantially orthogonal to the tube axis. On the inner peripheral surface 2 a of the perforated part 2, the base material of the metal material constituting the fluid pipe 1 is exposed. A mortar layer 3 is provided on the inner peripheral surface of the fluid pipe 1.

  The anticorrosion sleeve 10 is pressed and inserted in the substantially coaxial direction from the outside of the fluid pipe 1 to the perforated portion 2. Specifically, the distal end portion 13 of the cylindrical body having the distal end surface 13 a formed in a curved shape abuts almost simultaneously over the circumferential direction of the perforated portion 2. At this time, by using the groove portion 16 provided in the rear end portion 15 of the cylindrical body 11 as a mark, the cylindrical body 11 is circumferentially adjusted so that the curved surface shape of the distal end portion 13 matches the curved surface shape of the fluid pipe 1. It can be positioned and inserted into the perforated part 2.

  The tip portion 13 is positioned on the perforated portion 2 of the anticorrosion sleeve 10 by positioning the distal end edge side of the tapered surface 13b having a smaller diameter than the perforated portion 2 in the perforated portion 2 in the circumferential direction. Then, by pressing the anticorrosion sleeve 10 inward of the fluid pipe 1, the anticorrosion part 12 side having a larger diameter than the perforated part 2 on the tapered surface 13b is elastically deformed in the direction of diameter reduction of the cylindrical body 11 (FIG. 2 ( b) See dotted line box).

  As shown in FIGS. 3A and 3B, when the anticorrosion sleeve 10 is further inserted inward of the fluid pipe 1, the distal end portion 13 passes through the perforated portion 2 in the circumferential direction, and the fluid pipe 1. Located inside, the front end 13 is elastically restored to its natural shape, and the rear end 15 abuts and engages the outer wall of the fluid pipe 1 around the perforated part 2. In a natural state, the anticorrosion part 12 having a diameter larger than that of the perforated part 2 is sandwiched between the inner peripheral surface 2a of the perforated part 2 and the outer peripheral surface 14a of the body part 14 of the cylindrical body 11 and elastically deforms.

  In this way, simply by inserting the cylindrical body 11 of the anticorrosion sleeve 10 into the perforated part 2 of the fluid pipe 1, the elastic return force of the anticorrosive part 12 is used as a pressing force and pressed against the inner peripheral surface 2 a of the perforated part 2. Therefore, the anticorrosion can be reliably prevented over the inner peripheral surface 2a of the perforated portion 2 and without requiring extra steps such as the diameter expansion work of the anticorrosion portion 12 after insertion.

  Moreover, the anticorrosion part 12 can produce an elastic return force toward the inner peripheral surface 2a of the perforated part 2 by using the outer peripheral surface of the cylindrical body 11 having higher rigidity as a reaction force. In particular, since the cylindrical body 11 has the body part 14 provided with the outer peripheral surface 14a continuous in the circumferential direction, the anticorrosion part 12 uses the outer peripheral surface 14a of the body part 14 equally as a reaction force in the circumferential direction. It is possible to generate an equal elastic restoring force in the circumferential direction toward the inner peripheral surface 2a of the perforated part 2.

  In addition, since the distal end portion 13 of the cylindrical body 11 inserted through the perforated portion 2 is disposed in the fluid pipe 1 along the curved surface shape in the circumferential direction of the fluid pipe 1, the flow path region inside the fluid pipe 1 is reduced. Can be secured without erosion. Furthermore, since the front-end | tip part 13 arrange | positioned in the fluid pipe | tube 1 contact | abuts to the inner wall 3a of the fluid pipe | tube 1 of the circumference | surroundings of the piercing | piercing part 2 over the circumferential direction, the anticorrosion sleeve 10 is stabilized.

  Further, by sliding the tapered surface 13b of the distal end portion 13 of the cylindrical body 11 against the perforated portion 2, the anticorrosion sleeve 10 can be positioned with respect to the perforated portion 2, and the anticorrosive portion 12 side of the distal end portion 13 is elastically contracted. The cylindrical body 11 inserted through the perforated part 2 can be prevented from coming off by bending in the radial direction and passing through the perforated part 2 and elastically restoring after passing.

  Moreover, the excessive insertion of the anticorrosion sleeve 10 can be prevented by bringing the rear end portion 15 of the cylindrical body 11 into contact with the outer surface of the fluid pipe 1 around the perforated portion 2.

  In particular, since the front end portion 13 and the rear end portion 15 of the cylindrical body 11 are both formed with a larger diameter than the perforated portion 2, the insertion position of the anticorrosion sleeve 10 can be stabilized, and the anticorrosion portion 12 The state of being in contact with the perforated portion 2 and being anticorrosive can be maintained.

  Next, the anticorrosion sleeve 20 according to the second embodiment will be described with reference to FIGS. In addition, the same structure as the said Example and the overlapping structure and effect are abbreviate | omitted.

  As shown in FIGS. 4A to 4C, the anticorrosion sleeve 20 includes a cylindrical body 21 having a peripheral surface continuous in the circumferential direction, and an anticorrosion portion positioned on the outer peripheral side of the cylindrical body 21. 22. More specifically, the cylindrical body 21 includes a distal end portion 23 that passes through the perforated portion 2 and is disposed inside the fluid pipe 1, a barrel portion 24 that extends continuously from the distal end portion 23, and a barrel. This is an inner hollow cylinder having a substantially circular shape in plan view, and a rear end portion 25 continuous with the portion 24.

  As shown in FIGS. 4A to 4C and FIGS. 6A and 6B, the distal end portion 23 of the cylindrical body 21 has a substantially planar distal end surface 23a. Moreover, the front-end | tip part 23 has the taper surface 23b formed in the natural state gradually larger diameter than the piercing | piercing part 2 toward the anti-corrosion part 22 side from the front end edge of a diameter smaller than the piercing | piercing part 2. FIG.

  Next, the insertion of the anticorrosion sleeve 20 into the perforated portion 2 will be described.

  As shown in FIGS. 5A and 5B, the anticorrosion sleeve 20 is pressed and inserted in the substantially coaxial direction from the outside of the fluid pipe 1 to the perforated portion 2. Specifically, first, a portion of the tubular body 21 having the distal end surface 23 a formed in a substantially planar shape in the circumferential direction of the distal end portion 23 is a tube of the fluid pipe 1 on the inner circumferential surface 2 a of the perforated portion 2. It abuts on the top part. Then, by pressing the anticorrosion sleeve 20 inward of the fluid pipe 1, the anticorrosion part 22 side having a larger diameter than the perforated part 2 on the tapered surface 23 b is elastically deformed in the diameter reducing direction of the cylindrical body 21.

  Further, by pressing the anticorrosion sleeve 20 inward of the fluid pipe 1, the contact portion of the distal end portion 23 of the cylindrical body 21 with the perforated portion 2 in the circumferential direction gradually expands in the circumferential direction.

  In this way, the distal end portion 23 having the substantially planar distal end surface 23a of the cylindrical body 21 is in contact with the perforated portion 2 while gradually expanding the contact portion in the circumferential direction from the top of the fluid tube 1. Therefore, it is easy to gradually deform the tip portion 23 gradually from the contact portion toward the non-contact portion that has not yet contacted.

  As shown in FIGS. 6A and 6B, when the anticorrosion sleeve 20 is further inserted into the fluid pipe 1, the tip 23 passes through the perforated part 2 in the circumferential direction, and the fluid pipe 1. Located inside, the tip 23 is elastically restored to its natural shape, and the rear end 25 abuts and engages the outer wall of the fluid pipe 1 around the perforated part 2. In the natural state, the anticorrosion part 22 having a diameter larger than that of the perforated part 2 is sandwiched between the inner peripheral surface of the perforated part 2 and the outer peripheral surface of the body part 24 of the cylindrical body 21 and elastically deforms.

  In this way, simply by inserting the cylindrical body 21 of the anticorrosion sleeve 20 into the perforated part 2 of the fluid pipe 1, the elastic return force of the anticorrosive part 22 is used as a pressing force and pressed against the inner peripheral surface 2 a of the perforated part 2. Therefore, the anticorrosion can be reliably prevented over the inner peripheral surface 2a of the perforated part 2 and without requiring extra steps such as the diameter expansion work of the anticorrosion part after insertion.

  Further, since the distal end surface 23a of the distal end portion 23 of the cylindrical body 21 is formed in a substantially flat shape, the cylindrical body 21 can be applied regardless of the diameter of the fluid pipe 1 and the versatility is improved. The shape body 21 is easy to manufacture at a low cost.

  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.

  For example, in the above-described embodiment, the fluid pipe 1 is described as a water pipe through which clean water flows, but the fluid flowing in the fluid pipe may be liquid such as industrial water or sewage in addition to clean water, and liquid and gas. Etc. may be used.

  For example, in the first embodiment, the cylindrical body 11 and the anticorrosion portion 12 constituting the anticorrosion sleeve 10 are made of a resin material such as polyethylene, but the material of the member constituting the anticorrosion sleeve is, for example, a rubber material. It may be made of other materials such as an elastomer.

DESCRIPTION OF SYMBOLS 1 Metal fluid pipe 2 Perforated part 10 Corrosion prevention sleeve 11 Cylindrical body 12 Corrosion prevention part 13 Front-end | tip part 13a Front end surface 13b Tapered surface 14 Trunk part 15 Rear end part 20 Anti-corrosion sleeve 23a Front end face

Claims (3)

An anti-corrosion sleeve for preventing corrosion of a perforated portion of a metal fluid pipe, the tubular body inserted through the perforated portion, and an outer peripheral side of the tubular body that is in contact with the inner peripheral surface of the perforated portion The anti-corrosion part,
The anticorrosive portion has elasticity in a large diameter than the perforations in the natural state, it is pressed to contact with the inner peripheral surface of the perforated portion of the elastic return force as a pressing force,
The cylindrical body has a distal end portion that passes through the perforated portion and is disposed in the fluid pipe. The distal end portion has elasticity, and a distal end surface of the distal end portion has a curved shape of the perforated portion. A tapered surface formed with a gradually larger diameter than the perforated part from the front edge having a smaller diameter than the perforated part toward the anticorrosive part side. the has anticorrosion sleeve, characterized in that the perforated positioning mark for aligning the curved shape of the tip portion of the tubular body in a curved shape of the perforations.   The anticorrosion sleeve according to claim 1, wherein the anticorrosion portion is provided on an outer peripheral surface of the cylindrical body having a rigidity higher than that of the anticorrosion portion. It said tubular body, anticorrosion sleeve according to claim 1 or 2, characterized in that it has a rear end portion of a diameter larger than the perforation.

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