JPH061991U - Anticorrosion sleeve for pipe fittings - Google Patents

Abstract

(57) [Summary] [Purpose] In addition to suppressing corrosion of the water contact part of the pipe joint,
Even if it rusts, it will prevent the rust from flowing into the pipe. [Structure] The first tubular portion 2 is fitted into the inner periphery of the distal end portion of the tube insertion opening 12, and the second tubular portion 3 is fitted into the inner periphery of the tubular body portion 21 on the far side of the receiving opening 11, The waterproof sleeve 1 in which the tubular portions 2 and 3 are connected by the bellows portion 4 suppresses the fluid in the pipe from entering and leaving the water contact portion. By forming a plurality of ribs 5 on the outer peripheries of the tubular portions 2 and 3, the tolerance of the inner diameter of the pipe is absorbed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an anticorrosion sleeve of a pipe joint for preventing corrosion between the receiving and inserting openings of the pipe joint.

[0002]

[Prior art]

 Conventionally, as a pipe joint, as shown in FIG. 3, an insertion port 12 is inserted into a receiving port 11, and a tapered seal surface 14 on the inner circumference of the opening end of the receiving port 11 and an outer peripheral surface of the insertion port 12 are inserted. There is known a mechanical type in which a sealing material 13 is arranged in between, and the sealing material 13 is pressed by a push wheel 15. Alternatively, as shown in FIG. 4, an accommodation groove 34 is provided on the inner peripheral surface of the receiving port 31, a sealing material 33 is arranged, and the insertion port 32 is inserted into the receiving port 31 while compressing the sealing material 33. The slip-on type that is composed of is often used.

In these pipe joints, a fluid such as water in the pipes penetrates into the space between the inner periphery of the receiving ports 11 and 31 and the outer periphery of the insertion ports 12 and 32 on the inner side of the sealing materials 13 and 33. To do. Therefore, the outer peripheral surface and the distal end surface of the tip end portions of the insertion ports 12 and 32, and the inner peripheral surface and the rear end surface 20 of the rear end portions of the receiving ports 11 and 31 are water contact portions.

Since the mortar linings 22 and 36 are usually provided on the inner peripheral surfaces of the tube body portions 21 and 35 extending from the back side of the receiving ports 11 and 31 to the tips of the insertion ports 12 and 32, the mortar linings 22 and 36 are usually used for water contact. Therefore, the occurrence of corrosion is completely prevented. Further, the above-mentioned water contact part is also usually coated with anticorrosion.

[0005]

[Problems to be solved by the device]

 However, there is a problem that even if the wetted part is coated with anticorrosion, the anticorrosion coating gradually deteriorates during long-term exposure to running water and easily rusts. In addition, especially when the pipe is cut for adjusting the pipe length, the cut surfaces at the tips of the insertion ports 12 and 32 are exposed, and even if the cut end surfaces are repair-painted with a quick-drying paint, the thickness is thin and sufficient. There is a problem that corrosion resistance cannot be expected and rust occurs in a short period of time, and the rust easily flows into the pipe.

Therefore, the present invention solves such a problem and can prevent corrosion of the water contact portion of the pipe joint and prevent the rust from flowing into the pipe even if it rusts. The porpose is to do.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a first tubular portion that fits on the inner periphery of the distal end portion of the insertion opening and a second tubular portion that fits on the inner periphery of the tubular body portion on the back side of the receiving opening. A bellows portion connecting between the first and second tubular portions, and a plurality of pipe inner diameters formed to project from the outer circumference of the first and second tubular portions to absorb the tolerance. It has ribs.

[0008]

[Action]

 According to this structure, the fluid in the pipe is prevented from entering the water contact part of the pipe joint, and the corrosion of the tip end surface and outer peripheral surface of the insertion opening and the inner peripheral surface and the rear end surface of the inner part of the receiving opening is prevented. Occurrence is suppressed. Moreover, even if rust occurs, the rust is prevented from flowing into the pipe. Further, the bellows portion allows expansion and contraction and bending between the receiving and inserting openings. Due to the deformation of the ribs protrudingly formed on the outer periphery of the cylindrical portion, the tolerance of the inner diameter of the pipe is absorbed.

[0009]

【Example】

 First, the detailed structure of the mechanical expansion / contraction tube joint to which the anticorrosion sleeve of this embodiment is applied will be described with reference to FIG. A lock ring 17 is mounted on the inner circumference of the receiving port on the back side of the seal material 13, and a backup ring 18 is installed between the lock ring 17 and the seal material 13. A protrusion 19 is formed on the outer periphery of the tip of the insertion slot 12 so that the lock ring 17 can be engaged from the rear side of the reception opening. The engagement between the lock ring 17 and the protrusion 19 allows the insertion of the reception opening 11 and the insertion opening 12. Is prevented. The insertion opening 12 is extendable in the pipe axial direction between the position where the tip of the insertion opening 12 corresponds to the rear end surface 20 of the receiving opening 11 and the position where the protrusion 19 engages with the lock ring 17, and the receiving opening 11 and the insertion opening. A bending motion between 12 and 12 is also possible.

The inner peripheral surface of the receiving port 11 on the far side from the taper seal surface 14, the rear end surface 20 thereof, the outer peripheral surface of the distal end portion of the insertion port 12 and the distal end surface thereof are subjected to anticorrosion coating, and the cutting pipe In that case, repair painting is applied to the tip surface of the insertion port.

An anti-corrosion sleeve 1 is provided between the tip of the insertion opening 12 and the tubular body portion on the back side of the receiving opening 11. As shown in FIG. 1 and FIG. 2, the anticorrosion sleeve 1 is made of polypropylene or polyethylene, and fits in the inner periphery of the tip of the insertion slot 12 and the inner side of the receptacle 11. The second tubular portion 3 that fits in the inner periphery of the tube body portion 21 on the side and the expandable bellows portion 4 that connects the first and second tubular portions 2 and 3 are provided. . On the outer peripheral surfaces of the first and second tubular portions 2 and 3, a plurality of ribs 5 in the axial direction of the pipe for absorbing the inner diameter tolerance of the pipe are formed so as to project in the circumferential direction. The rib 5 is formed so that the protruding height gradually increases from the tips of the tubular portions 2 and 3 toward the bellows portion 4, so that the tubular portions 2 and 3 can be easily fitted and fixed in the pipe. Has been Flanges 6 and 7 are provided at the ends of the tubular portions 2 and 3 on the side of the bellows portion 4, respectively, and are configured to contact the tip end surface of the insertion opening 12 and the rear end surface 20 of the receiving opening 11.

In such a structure, when the anticorrosion sleeve 1 is mounted at a predetermined position between the receptacle 11 and the insertion slot 12 as shown in FIG. Then, the tubular portion 3 is fitted into the inner periphery of the tubular body portion 21 on the far side of the receiving port 11 or the tubular portion 2 is fitted into the inner periphery of the distal end portion of the insertion port 12, and in that state. By inserting the insertion opening 12 into the receiving opening 11, it can be securely mounted and fixed as shown. At that time, since the ribs 5 are provided on the outer peripheral surfaces of the tubular portions 2 and 3, the deformation of the ribs 5 can absorb the tolerance of the pipe inner diameter, and the tubular portions 2 and 3 can be accommodated regardless of the presence of the tolerance. Can be surely fitted.

In this way, the tubular portion 2 is fitted and fixed to the inner periphery of the distal end portion of the insertion opening 12, and the tubular portion 3 is fitted to the inner periphery of the tube body portion 21 on the back side of the receiving opening 11. When fixed by the above, the space between these tubular portions 21 is closed by the bellows portion 4, so that the fluid in the pipe can be restricted from entering between the receiving opening. Therefore, it is possible to suppress the corrosion of the front end surface of the insertion opening 12, the outer peripheral surface thereof, the inner peripheral surface of the receiving opening 11 and the rear end surface 20 thereof, and even when rust occurs, the rust is prevented from flowing into the pipe. It can be prevented. Further, since the space between the tubular portions 2 and 3 is formed as a bellows portion 4 and is expandable and contractible, it is possible to follow the receiving opening 11 and the insertion opening 12 even if the receiving opening 11 and the insertion opening 12 expand and contract with each other. .

In the above, an example in which the anticorrosion sleeve of the present invention is applied to a mechanical type expansion joint with a detachment prevention mechanism has been shown. It can also be applied to a slip-on type pipe joint in which the sealing material 33 is compressed between the peripheral surface and the outer peripheral surface of the insertion port 32. In that case, the anticorrosion sleeve 1 may be fitted into the insertion opening 32 side, and then the insertion opening 32 may be inserted into the receiving opening 31.

[0015]

[Effect of device]

 As described above, according to the present invention, the first tubular portion is fitted to the inner periphery of the distal end portion of the insertion opening, and the second tubular portion is installed to the inner periphery of the tubular body portion on the back side of the receiving opening. By fitting in, it is possible to suppress the infiltration of the fluid in the pipe between the receiving and inserting ports, and to suppress the corrosion of the tip surface of the insertion port and its outer peripheral surface, the inner peripheral surface of the receiving port and its inner end surface, and to prevent rust. Even if it occurs, the rust can be prevented from flowing into the pipe. Further, since the first and second tubular portions are connected by the bellows portion, it is possible to cope with expansion and contraction and bending between the receiving opening and the insertion opening. Furthermore, since the ribs protruding from the outer periphery of the tubular portion can absorb the tolerance of the inner diameter of the pipe, the tubular portion can always be securely fixed in the fitted state and the anticorrosion effect can be exerted. it can.

[Brief description of drawings]

FIG. 1 is a sectional view of an anticorrosion sleeve according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a vertical cross-sectional view of a mechanical type pipe joint to which the anticorrosion sleeve is applied.

FIG. 4 is a vertical sectional view of a slip-on type pipe joint to which the anticorrosion sleeve is applied.

[Explanation of symbols]

 1 Anticorrosion Sleeve 2 First Cylindrical Section 3 Second Cylindrical Section 4 Bellows Section 5 Rib

Claims (1)

[Scope of utility model registration request] 1. A pipe joint in which an insertion port is inserted and joined into a receiving port, wherein a first tubular portion that fits on an inner circumference of a distal end portion of the insertion port and a tube body portion on the back side of the receiving port are provided. The second tubular portion that fits on the inner periphery, the bellows portion that connects the first and second tubular portions to each other, and the second tubular portion that protrudes from the outer periphery of the first and second tubular portions are formed. An anticorrosion sleeve for a pipe joint, comprising: a plurality of ribs for absorbing a tolerance of a pipe inner diameter.