JP2006275206A - Anticorrosive structure of insertion port end surface and its anticorrosive method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily fix an anticorrosive core to an insertion port. <P>SOLUTION: A cross-sectional U-shaped rubber anticorrosive core 17 is fitted to the whole periphery of an end surface 12a of the insertion port 12 connected to a socket 11 of a connecting ring 20, and an anticorrosive core fixture 16 is fitted to the anticorrosive core 17. The anticorrosive core fixture 16 has a cylindrical band part 16a contacting with an outer peripheral surface of the anticorrosive core 17 and a claw part 16b extending to the inside, and fixes its anticorrosive core 17 to the insertion port 12 by bringing the claw part into pressure contact with an inner peripheral surface of the anticorrosive core 17 by tucking the claw part 16b inside. Since the anticorrosive core fixture 16 fixes the anticorrosive core 17 to the insertion port 12 by sandwiching the anticorrosive core 17 from the inside and outside, work is facilitated. The insertion port end surface 12a contributes to facilitation of the work due to becoming anticorrosive by the anticorrosive core 17 and the anticorrosive core fixture 16 of a simple structure. When an outer diameter of the band part 16a is set smaller than an outer diameter of an insertion port ring 14 locked on a lock ring 13 arranged on the socket 11 side, press-in resistance in insertion is desirably reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to anticorrosion of an insertion port end surface formed by a cut pipe in a joint portion of a metal pipe used for a water pipe or the like.

  Conventionally, the cut end face of a ductile pipe used for a water pipe or the like has been coated after being coated with a paint for anticorrosion of the cut end face and dried. However, since this paint takes time to dry especially in cold weather, there is a problem that the anticorrosion method using the paint cannot be used when switching the pipeline without stopping the running water of the pipeline. It was.

Then, the technique of attaching an anticorrosion core to a cut tube end surface is disclosed. For example, the anticorrosion structure of the insertion port end face shown in Patent Document 1 is used for the end 2a of the insertion port 2 joined to the NS joint shown in FIG. 8A, and is shown in FIG. 8B. Thus, the annular insertion ring 4 is fitted on the outer periphery of the insertion opening 2, and the U-shaped anticorrosion core 6 is fitted on the entire periphery of the end 2a. The anticorrosive core fixing ring 8 made of stainless steel is applied to the inner peripheral surface of the anticorrosive core 6, and the diameter of the fixing ring 8 is expanded, whereby the anticorrosive core 6 is inserted and fixed to the opening 2.
Since the guard 8 having a U-shaped cross-section covering the outside of the anticorrosion core 6 is provided on the ring 8 at a predetermined interval, the guard 7 is locked when the insertion slot 2 is inserted into the receiving slot 1. 3 to avoid damage to the anticorrosion core 6.

In Patent Document 2, a stainless steel cap having a U-shaped cross section is fitted over the entire circumference of the end of the insertion slot, a caulking material is filled in the gap between the cap and the tube, and then the stainless steel cap is used with a jig. An anticorrosion structure in which a pipe and a cap are fixed by expanding the diameter of the inner peripheral surface is disclosed.
JP 2003-120891 A Japanese Unexamined Patent Publication No. 2-309096

  In the anticorrosion structure shown in Patent Document 1 (FIG. 8), in order to fix the anticorrosion core 6 to the insertion opening 2, it is necessary to expand the diameter of the anticorrosion core fixing ring 8 inside the insertion opening 2. Since this diameter expansion is performed inside the insertion slot, the work space is narrow, and a special jig is required for the work, and a large force is required for diameter expansion, facilitating the work. There is room for improvement from the point of view.

On the other hand, the anticorrosion structure shown in Patent Document 2 uses a U-shaped stainless steel cap (guard) as an anticorrosion core, but does not use an anticorrosion core fixing ring as in Patent Document 1, and has a stainless steel cap and an insertion opening. A caulking material is filled between the two and fixed.
Accordingly, it takes time to dry the caulking material, and it is necessary to expand the diameter of the inner circumferential surface of the cap, which is troublesome. For this reason, what can be constructed in a shorter time and is easy to install is desired.

  Then, this invention makes it a subject to enable it to fix an anticorrosion core to an insertion port easily.

In order to solve the above-mentioned problems, the present invention first fits an annular anti-corrosion core fixture on the radially outer side of the rubber anti-corrosion core attached to the end face of the insertion slot. Workability is better than inside if it is outside the insertion slot.
Next, the nail | claw part provided in the anticorrosion core fixing tool was folded inward, and was press-contacted to the internal peripheral surface of the anticorrosion core. In this way, the anticorrosion core can be fixed by pinching the anticorrosion core fixture and the claw from both the inside and outside, and pressing it against the inside and outside surfaces of the mouth. It is. Further, a general tool such as a plier can be used for the work, and the work is easy, and a dedicated jig such as a conventional diameter expansion tool is unnecessary.

  In the present invention, the anticorrosion core can be easily fixed to the insertion opening.

As an embodiment of the above means, in the metal anticorrosive core fixture for fixing a rubber anticorrosive core having a U-shaped cross section fitted to the entire circumference of the end face of the insertion opening to the insertion opening, the outer peripheral surface of the anticorrosion core Corrosion-preventing core having a cylindrical band portion in contact with the inner surface and a claw portion that extends radially inward from the outer end in the cylinder axis direction of the band portion and folds into the insertion opening so as to be in pressure contact with the inner peripheral surface of the anticorrosion core A fixture was used.
If it does in this way, since the insertion port end surface can be anticorrosive with the anticorrosion core main body and the anticorrosion core fixing tool of simple structure, it can contribute to the simplification of work.

As the anticorrosion structure of the insertion port end surface using the anticorrosion core fixture, a rubber anticorrosion core having a U-shaped cross section is fitted to the entire circumference of the end surface of the insertion port, and the band of the anticorrosion core fixture is attached to the outer peripheral surface of the corrosion prevention core It is possible to adopt a configuration in which a portion is fitted, the claw portion is applied to the end surface of the anticorrosion core, and the claw portion is folded into the insertion opening so as to be in pressure contact with the inner peripheral surface of the anticorrosion core.
If it does in this way, the said band part will press-contact on the outer side of a corrosion-proof core, and a nail | claw part will press-contact on the inner side of a corrosion-proof core. Since the anticorrosion core can be fixed to the insertion port by pinching the band portion and the claw portion of the anticorrosion core fixture from the inside and outside, the work is easy.

  Further, the above configuration is adopted in the insertion port connected to the reception port of the joint ring, and the insertion port ring that is engaged with the lock ring provided in the reception port is provided on the end surface portion. If the outer peripheral surface of the band part is located on the inner side in the tube radial direction than the outer peripheral surface of the insertion port ring, it is provided on the inner side of the anticorrosion core fitted in the tube axis direction. Since the resistance of press-fitting at the time of inserting the insertion opening is reduced, the joining is smooth. Moreover, since the band part press-contacts to the flat outer peripheral surface of the outer side of the anticorrosion core in the radial direction, the band part is stable.

  Furthermore, if the band part is fixed to the insertion port by screw fastening or rivet fastening, the anticorrosion core fixing tool will not easily come off from the insertion port, so the anticorrosion core fixing tool will come off and the anticorrosion core will come off. Can prevent loosening. Moreover, since the screw fastening or rivet fastening is performed outside the insertion opening, workability is good.

Moreover, as a corrosion prevention method of the insertion port end face using the corrosion prevention core fixture having the above-described configuration, a rubber corrosion prevention core having a U-shaped cross section is fitted around the entire end face of the insertion opening, and the corrosion prevention core is fixed to the outer peripheral surface of the corrosion prevention core. A method can be employed in which the band portion of the tool is fitted, the claw portion is applied to the end surface of the anticorrosion core, and then the claw portion is folded into the insertion opening to press contact with the inner peripheral surface of the anticorrosion core. .
If it does in this way, since the said band part will press-contact the outer side of a corrosion-proof core, and a nail | claw part will press-contact the inner side of a corrosion-proof core, and an anti-corrosion core is fixed to the insertion port by this pressure-contact, operation | work is easy. Moreover, since the end face of the insertion opening can be prevented from being corroded by the anticorrosion core main body and the anticorrosion core fixture having a simple structure, it is possible to contribute to facilitating work.

  One embodiment will be described with reference to FIGS. The anticorrosion structure 10 for the end face of the insertion opening of this embodiment has an insertion opening 12 (NS-shaped cutting tube insertion ring / tapping screw type (for connection of the connection ring)) joined to the receiving opening 11 of the connection ring 20 shown in FIG. In the end surface portion 12a of the insertion opening 12, the metal background portion exposed by the cut tube processing is anticorrosive. For the anticorrosion, a pipe end anticorrosion core 17 that covers the end face portion 12a shown in FIG. 1 and an anticorrosion core fixture 16 that inserts the anticorrosion core 17 and fixes it to the opening 12 are used.

The anticorrosion core 17 is made of a resin having a certain degree of elasticity or rubber, and has an annular shape having a U-shaped cross section as shown in FIG. The anticorrosion core 17 is fitted and attached to the entire circumference of the insertion port 12 so as to cover the end surface portion 12a of the insertion port 12 formed of a cut tube and the inner peripheral surface of the insertion port near the end surface portion 12a. Is done.
The hardness of the rubber constituting the anticorrosion core 17 is JIS K 6253 5. The hardness _HA according to the durometer hardness test specified in JIS is preferably about 50 to 90. Further, the length in the tube axis direction of the outer peripheral surface 17a of the anticorrosion core 17 and the thickness of the outer peripheral portion thereof can be arbitrarily set within a range that does not hinder the bending, expansion and contraction, and the detachment preventing force of the joint. it can.

The anticorrosion core fixture 16 includes a cylindrical band portion 16a that is in contact with the outer peripheral surface 17a of the anticorrosion core 17, a flange portion 16c that extends radially inward from the outer end in the cylinder axis direction of the band portion 16a, and And a claw portion 16b protruding further inward than the flange portion 16c. A plurality of the claw portions 16b are provided at predetermined intervals along the circumference of the anticorrosion core fixture 16, and the claw portions 16b are protruded inward from the inner peripheral surface of the band portion 16a (FIG. 1). The length indicated by A) is larger than the thickness of the anticorrosion core 17 (the length indicated by B in the figure).
Further, the band portion 16a and the flange portion 16c are each formed in an annular shape, but have broken line portions 16d and 16d shown at one place around the circumference. As the gap between the broken line portions 16d and 16d expands and contracts, the diameter of the band portion 16a can be slightly changed.

  Further, the claw portion 16b is annealed at its bent portion so that it can be easily caulked with a pliers or the like.

The procedure when the anticorrosion structure is provided by the anticorrosion structure of the insertion port end will be described. First, as shown in FIGS. 7A and 7B, a rubber having a U-shaped cross section is formed on the entire periphery of the end surface 12a of the insertion port 12. The anticorrosion core 17 is fitted.
An insertion port ring 14 is provided on the outer peripheral surface of the insertion port 12 to be engaged with a lock ring 13 provided in the receiving port 11 of the joint ring 20, and the position of the insertion port ring 14 is the position of the insertion port 12. It is a portion that is separated from the end surface portion 12a by a predetermined distance in the tube axis direction.

  Next, the anticorrosion core fixture 16 is fitted on the outer side of the anticorrosion core 17. The band portion 16 a of the anticorrosion core fixture 16 is in contact with the flat outer peripheral surface 17 a of the anticorrosion core 17 so as not to hit the insertion ring 14. Further, the claw portion 16 b extending radially inward from the end portion in the cylinder axis direction of the band portion 16 a is in contact with the end surface of the anticorrosion core 17. After the anticorrosion core fixture 16 is fixed with a giant clam vise, etc., a drill hole that penetrates the anticorrosion core 17 is drilled from the outside of the band portion 16a with a drill, and a bolt 18 is screwed into the pilot hole, and the band portion 16a is fixed. Fastened and fixed to the insertion slot 12 (see FIG. 7C). For this fixing, bolts, screws, rivets or the like may be used. Further, when the bolt 18 and the band portion 16a are made of different metals, it is desirable to install an insulator such as rubber or resin between the bolt 18 and the band portion 16a.

The giant clam vise is removed, and in this state, the band portion 16a and the claw portion 16b are squeezed with a tool such as a pliers, and the claw portion 16b is moved from the position indicated by the solid line to the position indicated by the broken line in FIG. The claw portion 16b is in pressure contact with the inner peripheral surface 17b of the anticorrosion core 17 (see FIG. 7E). By this pressure contact, the anticorrosion core 17 is pressed against and closely adhered to the inner and outer peripheral surfaces of the insertion opening 12 and fixed to the insertion opening 12.
In this operation, a large force as in the conventional diameter expansion operation is unnecessary, and a general tool such as a plier can be used for the operation, and the operation is easy. Moreover, since the bending part of the nail | claw part 16b is annealed, it can be bent easily.
Thus, since the anticorrosion core fixture 16 is pressed against the anticorrosion core 17 from both the inner and outer peripheral surfaces 17a, 17b, the degree of adhesion between the anticorrosion core 17 and the insertion opening 12 can be increased both inside and outside. Moreover, since the band part 16a press-contacts with the flat outer peripheral surface 17a of the anticorrosion core 17, it is stable.

  Next, the insertion port 12 subjected to the anticorrosion in this way is joined to the receiving port 11 of the joint ring 20. The joining procedure is shown in FIGS. 5 (a) and 5 (b) and FIG.

  As shown in FIGS. 5A and 5B, the end surface portion 12 a of the insertion port 12 abuts on the lock ring 13 of the receiving port 11 and is joined while the lock ring 13 is expanded. If the insertion slot ring 14 passes through the lock ring 13, the insertion slot ring 14 is locked with the lock ring 13 when the insertion slot 12 moves in the withdrawal direction.

  When the insertion slot 12 reaches a predetermined position, a wedge-shaped packing 15 is inserted into the gap between the insertion slot 12 and the receiving slot 11 as shown in FIG. The inclined surface 15a of the packing 15 is brought into pressure contact with the inclined surface 11a on the inner periphery of the receiving port 11, and the flange 11b of the receiving port 11 and the fixing member 15b of the packing 15 are fastened with bolts 19 and nuts 19a to fix them.

The perspective view of the insertion slot of one Example The state which joined the insertion slot and the receiving opening of the Example is shown. Cut front view of the insertion slot of the same embodiment Side view of FIG. Explanatory drawing which shows the state at the time of joining the insertion port of the Example to a receptacle Explanatory drawing which shows the state at the time of joining the insertion port of the Example to a receptacle Explanatory drawing which shows the attachment method of the anticorrosion structure of the Example The anticorrosion structure of a prior art example is shown, (a) is a principal part enlarged view, (b) shows the state at the time of joining an insertion port to a receptacle.

Explanation of symbols

1, 11 Receiving port 2, 12 Inserting port 3, 13 Lock ring 4, 14 Inserting ring 5 Rubber ring 6, 17 Corrosion-proof core 7 Guard 8 Inner circumference fixing ring 9 Lining 10 Corrosion-proof structure 12a of end surface of insertion port End surface part 15 Packing 16 Corrosion-proof core fixture 16a Band portion 16b Claw portion 18, 19 Bolt 20 Joint ring

Claims (5)

In the metal anticorrosion core fixture 16 for fixing the rubber anticorrosion core 17 having a U-shaped cross section fitted to the entire circumference of the end surface portion 12a of the insertion opening 12 to the insertion opening 12,
A cylindrical band portion 16a that is in contact with the outer peripheral surface of the anticorrosion core 17, and an inner periphery of the anticorrosion core 17 that extends radially inward from the outer end in the cylinder axis direction of the band portion 16a and is folded into the insertion opening 12. An anticorrosion core fixture having a claw portion 16b that can be pressed against the surface.   The anticorrosion structure of the insertion port end face using the anticorrosion core fixture 16 according to claim 1, wherein a rubber anticorrosion core 17 having a U-shaped cross section is fitted to the entire periphery of the end surface part 12 a of the insertion opening 12, and the anticorrosion core 17. The band portion 16a of the anticorrosion core fixture 16 is fitted to the outer peripheral surface of the anticorrosion core, the claw portion 16b is directed to the end surface of the anticorrosion core 17, and the claw portion 16b is folded into the insertion opening 12 to thereby prevent the corrosion prevention. The anticorrosion structure of the end face of the insertion opening pressed against the inner peripheral surface of the core 17. The insertion port 12 is connected to the receiving port 11 of the joint ring 20, and the insertion port 12 has an insertion port ring 14 that engages with a lock ring 13 provided in the receiving port 11. It is provided on the inner side in the tube axis direction than the anticorrosion core 17 fitted to the end face part 12a,
The anticorrosion structure for an insertion port end surface according to claim 2, wherein the outer peripheral surface of the band portion 16a is located on the inner side in the tube radial direction than the outer peripheral surface of the insertion port ring 14.   The said band part 16a is fixed to the said insertion port 12 by screw fastening or rivet fastening, The anticorrosion structure of the insertion port end surface of Claim 2 or 3 characterized by the above-mentioned.   An anticorrosion method for an insertion port end surface using the anticorrosion core fixture 16 according to claim 1, wherein a rubber anticorrosion core 17 having a U-shaped cross section is fitted to the entire circumference of an end surface portion 12 a of the insertion port 12. The band portion 16a of the anticorrosion core fixture 16 is fitted to the outer peripheral surface of the anticorrosion core, the claw portion 16b is directed to the end surface of the anticorrosion core 17, and then the claw portion 16b is folded into the insertion opening 12. An anticorrosion method for the end face of the insertion port that is in pressure contact with the inner peripheral surface of the anticorrosion core 17.

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