Connecting device of corrugated pipe

Abstract

The invention provides a connecting device of a corrugated pipe, and aims to solve the problem of preventing galvanic corrosion by using a structure that a straight pipe part and an expansion part of a stainless steel corrugated pipe are wrapped by a silica gel sealing part. The invention aims to provide a connecting device of a corrugated pipe. The connecting device comprises a stainless steel corrugated pipe; a straight pipe part formed on the stainless steel corrugated pipe; the metal connecting piece is inserted into the outer diameter of the straight pipe part; a synthetic resin sleeve having a flange part inserted into the outer diameter of the straight pipe part; and an expansion part which is formed at the end of the straight pipe part and comprises a silica gel sealing part, a protruding part which is inserted into the inner diameter of the straight pipe part is formed on the inner side of a ring part which is installed in a mode of being in contact with the expansion part, and an insertion part which wraps the expansion part is formed on the outer side of the ring part.

Description

Technical Field

[0001] The present invention relates to a bellows connection device capable of preventing galvanic corrosion by insulating an expansion portion formed at an end of a straight pipe portion of a stainless steel bellows from a dissimilar metal product connected to the straight pipe portion through a connection piece. Background Art

[0002] Stainless steel bellows used for piping of boiler hot water, etc. are connected with dissimilar metal products (such as brass pipes, brass galvanized joints, etc.).

[0003] When water flows through a stainless steel bellows when it is connected to a dissimilar metal product, a potential difference will be generated at the connection between the stainless steel bellows and the dissimilar metal, and a current of about 1 to 2 mA will be generated depending on the water temperature and state. This current is the direct cause of galvanic corrosion.

[0004] The flared ends of straight pipe sections used to install fittings in stainless steel bellows are particularly susceptible to galvanic corrosion.

[0005] Due to this problem, U.S. Patent No. 5169180 proposes forming a flange 2 on a synthetic resin sleeve 1 as an insulator inserted into a corrugated tube to insulate an expansion portion 4 formed at the end of the corrugated tube 3 from a dissimilar metal product, such as Figure 1 shown.

[0006] However, the US patent product has limitations in preventing galvanic corrosion in the expansion portion 4 due to water ingress, because the water tightness between the flange 2 and the dissimilar metal joint is not complete.

[0007] Prior art literature

[0008] Patent Document 1: U.S. Patent No. 5169180 Summary of the invention

[0009] Technical problem to be solved by the invention

[0010] The problem to be solved by the present invention is to provide a bellows connecting device having a structure in which a straight pipe part and an expansion part of a stainless steel bellows are wrapped with a silicone sealing part to prevent galvanic corrosion.

[0011] Technical solutions to solve problems

[0012] The object of the present invention is to provide a connecting device for a corrugated pipe, comprising: a stainless steel corrugated pipe; a straight pipe portion formed on the stainless steel corrugated pipe; a metal connecting piece inserted into the outer diameter of the straight pipe portion; a synthetic resin sleeve having a flange portion inserted into the outer diameter of the straight pipe portion; an expansion portion formed at the end of the straight pipe portion, wherein the device comprises a silicone sealing portion, a protrusion formed on the inner side of a ring portion installed in contact with the expansion portion and inserted into the inner diameter of the straight pipe portion, and an insertion portion formed on the outer side to wrap the expansion portion.

[0013] Effects of the Invention

[0014] According to the present invention, between the protrusion and the insertion portion of the silicone seal portion squeezed by the opposite side component and the connector connected to the stainless steel bellows, the stainless steel expansion portion susceptible to galvanic corrosion is connected to the bellows in a wrapped state, thereby being insulated from the opposite side dissimilar metal side, thereby having the effect of eliminating the risk of galvanic corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an exploded perspective view of the present invention.

[0016] Figure 2 It is a cross-sectional view of the present invention.

[0017] Reference numerals

[0018] 10: Bellows 11: Straight pipe

[0019] 12: expansion part 20: connection piece

[0020] 30: casing 40: sealing part

[0021] 41: protrusion 43: insertion DETAILED DESCRIPTION

[0022] Specific embodiments will be described in detail below with reference to the accompanying drawings.

[0023] like Figure 1 and Figure 2 As shown, the present invention relates to a connecting device for a corrugated pipe, comprising: a stainless steel corrugated pipe 10; a straight pipe portion 11 formed on the stainless steel corrugated pipe 10; a metal connecting piece 20 inserted into the outer diameter of the straight pipe portion 11; a synthetic resin sleeve 30 having a flange portion 31 inserted into the outer diameter of the straight pipe portion 11; an expansion portion 12 formed at the end of the straight pipe portion 11, wherein the silicone sealing portion 40 is formed, and a protrusion 42 inserted into the inner diameter of the straight pipe portion 11 is formed on the inner side of a ring portion 41 installed in a manner of contacting the expansion portion 12, and an insertion portion 43 wrapped around the expansion portion 12 is formed on the outer side.

[0024] The coupling hole 21 of the metal connector 20 passes through the ring portion 41 but is stuck in the flange portion 31. This means that when the connector 20 is tightened to the joint on the opposite side connected to the stainless steel bellows 10, the insertion portion 43 and the ring portion 41 of the silicone seal 40 in contact are squeezed and the expansion portion 12 is insulated from the outside in a completely isolated state, so that corrosion caused by microcurrent generated by the potential difference does not occur.

[0025] The flange portion 31 of the synthetic resin sleeve 30 plays a role in compressing the insertion portion 43 of the silicone seal 40 when the connector 20 is tightened.

[0026] The protrusion 42 is inserted into the inner diameter of the straight tube portion 11 to a depth sufficient to prevent microcurrent from affecting the expansion portion 12 to maintain water tightness, and together with the insertion portion 43 , prevents galvanic corrosion from occurring in the expansion portion 12 .

[0027] In the present invention, the metal connector 20 and the synthetic resin sleeve 30 are inserted into the straight tube portion 11 of the stainless steel bellows 10, and the expansion portion 12 is formed at the end of the straight tube portion 11, and then the protrusion 42 of the silicone sealing portion 40 is inserted into the inner diameter of the stainless steel bellows 10, so that the expansion portion 12 enters the widened insertion portion 43, thereby achieving bonding.

[0028] Since the protrusion 42 and the insertion portion 43 are thin, they can be widened or turned over to be inserted into the expansion portion 12 in a wrapped manner, and are made of an elastic silicone material having sufficient elasticity to restore its original shape.

[0029] As described above, according to the present invention, the stainless steel expansion portion 12 which is susceptible to galvanic corrosion is combined in a wrapped state between the ring portion 41 and the protrusion 42 and the insertion portion 43 of the silicone seal portion 40 squeezed by the opposite side component connected to the bellows 10 and the connector 20, thereby isolating the opposite side dissimilar metal side connected to the bellows 10, thereby having the effect of eliminating the risk of galvanic corrosion.

[0030] In the above, the present invention is described with reference to the accompanying drawings, but the present invention is not limited thereto, and various modifications can be made without departing from the technical idea of ​​the present invention.

Claims

1. A bellows connecting device, comprising: Stainless steel bellows; A straight pipe portion formed in the stainless steel bellows; a metal connector inserted into the outer diameter of the straight pipe portion; a synthetic resin bushing having a flange portion inserted into the outer diameter of the straight pipe portion; An expansion portion is formed at the end of the straight tube portion, The invention comprises a silicone seal part, a protrusion inserted into the inner diameter of the straight tube part is formed on the inner side of the ring part installed in contact with the expansion part, and an insertion part covering the expansion part is formed on the outer side.

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