JP2008051333A - Vibration control pipe coupling member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relatively short axial directional length pipe coupling member having bellows, which has an expansion absorbing part for absorbing the expansion in at least the axial direction, particularly, in a covering part, eliminates influence from the other member on the bellows, and is superior in amplitude strength and expansion strength or flexural strength. <P>SOLUTION: A pipe body 2 is the bellows having crest parts 3 and trough parts 3, and is the pipe coupling member 1 having the relatively short axial directional length. The covering part 5 is formed on the outer periphery of the bellows 3 by a thick rubber member. The covering part 5 has the expansion absorbing part 6 for absorbing at least axial expansion of the pipe body 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention is a pipe joint member having a relatively short axial length having a bellows, and in particular, the covering portion has an expansion / contraction absorbing portion that absorbs expansion / contraction at least in the axial direction, thereby eliminating the influence of the bellows from other members. The present invention relates to a vibration-proof pipe joint member that is excellent in amplitude strength, stretch strength, bending strength, and the like.

    Conventionally, pipe joint members have been subjected to various vibrations and expansions and contractions, and damage has occurred at various points as vibrations and expansions continue in combination. Moreover, the damage of the vibration which a pipe joint member receives is large, and the silence (noise reduction etc.) is also a subject.

    As a pipe joint member having a relatively short axial length, for example, a pipe joint member (Patent Document 1) composed of a plurality of bellows as shown in FIG. 12 or a single bellows as shown in FIG. There is a pipe joint member (Patent Document 2).

    Such a pipe joint member 1 is provided at the both ends of a cylindrical pipe body 2 composed of bellows 3 (mountain portion: 3a, trough portion: 3b) to absorb and absorb various vibrations and expansion / contraction. It consists of a pair of flanges 4 and 4 and is connected to other members (not shown) via flanges 4 and 4 at both ends, and fluid such as water and gas such as gas is passed through the cylindrical tube body 2. It circulates without leakage. Reference numerals 4a and 4a denote mounting holes provided in the flanges 4 and 4, respectively.

    The pipe joint member 1 varies depending on the purpose and place of use. For example, a pipe having a plurality of bellows 3,... Is subject to deformation due to vibration, etc. Deformation to absorb misalignment is also severe. In addition, the one bellows 3 is particularly deformed to absorb eccentricity and expansion / contraction in addition to being deformed by vibration or the like in the left and right portions 2a and 2a of one mountain.

    Further, since such a pipe joint member 1 is a metal member, there is a problem of corrosion (corrosion prevention) as a material problem, and metal fatigue or the like must be maintained for a long time. There is also a problem of deterioration such as chemicals.

    As described above, the inventors of the present application maintain the excellent properties of the metal member, and intensively research on the members that complement each other and the shapes of the members that complement each other. Thus, the present invention can be known. In other words, it has excellent anti-vibration and vibration-damping properties, and prevents its own influence or the influence of the bellows from other members (corrosion, metal fatigue, chemical resistance, noise reduction, temperature, deformation, etc.). Knowing possible pipe joint members.

    The present invention has been made under such circumstances, and it is possible to protect the bellows by removing the influence from other members, and in particular, the outer periphery of the bellows is stretched at least in the axial direction. An object of the present invention is to provide a vibration-proof pipe joint member that has an expansion / contraction absorbing portion to absorb and is excellent in amplitude strength, expansion / contraction strength, bending strength, and the like.

    In order to achieve such an object, according to the present invention, as described in claim 1, the pipe body is a bellows having a peak portion and a valley portion, and is a pipe joint member having a relatively short axial length. A covering portion is formed of a thick rubber member on the outer periphery of the tube, and the covering portion has an expansion / contraction absorbing portion to absorb expansion / contraction of the tube body at least in the axial direction. According to a second aspect of the present invention, the expansion / contraction absorbing portion that absorbs expansion / contraction in the axial direction forms a U-shaped notch portion on the outer periphery of the covering portion of the valley portion of the bellows. As described, the expansion / contraction absorption part that absorbs expansion / contraction in the axial direction is characterized by forming a constant thickness part along the outer periphery of the covering part of the peak part and the valley part of the bellows. In addition, the expansion / contraction absorbing portion that absorbs expansion / contraction in the axial direction is formed as a cut portion in the covering portion.

    Further, as described in claim 5, the pipe main body is a pipe joint member having a relatively short axial length having a bellows of one peak, and a covering portion having a constant thickness is provided at the peak and its end. In addition, the covering portion is formed by forming a stretch absorbing portion that absorbs at least stretching in the axial direction as a notch, and as described in claim 6, The stretch absorption part that absorbs expansion and contraction in the axial direction is formed as a constant thickness part.

    According to invention of Claim 1 and Claim 5, since the coating | coated part of the rubber member thicker than the outer periphery of a bellows is formed in the outer periphery of the axial direction of a pipe | tube main body, a bellows is made from another member. In addition to the excellent properties of metal members, the rubber members can complement each other and can be protected from the radial direction. Since the expansion / contraction absorbing portion that absorbs at least expansion / contraction in the axial direction is provided, a vibration-proof pipe joint member having excellent amplitude strength, expansion / contraction strength, bending strength, and the like in the axial direction can be obtained.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing a vibration-proof pipe joint member provided with a U-shaped notch on the outer periphery of a bellows crest, and FIG. 2 shows a constant outer periphery of the bellows crest and trough. It is sectional drawing which shows the pipe joint member for vibration suppression which formed the thick part. Note that the same members as those in the prior art will be described with the same reference numerals.

    In FIG. 1, the pipe body 2 is composed of a bellows 3 having a peak portion 3a and a valley portion 3b, and is composed of a pipe joint member 1 having a relatively short axial length. A pair of flanges 4 and 4 are provided at both end portions 2 a and 2 a of the tube body 2. The pipe joint member 1 is improved in the vibration isolation and damping properties in the axial direction of the pipe body 2 and is excellent in amplitude strength, expansion / contraction strength, bending strength, etc., and the bellows 3 is made of metal by eliminating the influence of other members. It is necessary to be able to eliminate the influence from the radial direction of the tube body 2 coupled with the excellent properties of the member.

    For this reason, a covering portion 5 made of a thick rubber member is formed on the outer periphery of the bellows 3, and the covering portion 5 has an expansion / contraction absorbing portion 6 so as to absorb at least the expansion and contraction of the tube body 2 in the axial direction. is doing. Specifically, the expansion / contraction absorbing portion 6 that absorbs expansion / contraction in the axial direction is provided with a U-shaped notch portion 7 on the outer periphery of the covering portion 5 of the valley portion 3 b of the bellows 3.

    This rubber member only needs to exhibit rubbery elasticity by vulcanization, and includes natural rubber and synthetic rubber. As synthetic rubber, polyisobutylene, butyl rubber, recycled butyl rubber butyl rubber, halogenated butyl rubber, EPT, ethylene propylene rubber, Examples include isoprene rubber, BR, SBR, NBR, chlorobrene rubber (CR), polyethylene chloride, chlorosulfonated polyethylene, acrylic rubber (ACM), epichlorohydrin rubber, and liquid rubber.

Although rubber-like elasticity is layered on the outer periphery of the bellows 3, different types of rubber-like elasticity such as silicon rubber which is suitably bonded may be used, and a surface extending between the pair of flanges 4 and 4 is also suitable. Different types of rubber-like elastic bodies such as silicon rubber adhered to the substrate may be used. Moreover, the part 2a in which the insertion hole which penetrates the pipe | tube main body 2 is opened, and the most advanced flare edge part (illustration omitted) part are good also as rubber-like elasticity.

    As described above, since the coating portion 5 of the rubber member that is thicker than the outer periphery of the bellows 3 is formed on the outer periphery in the axial direction of the tube main body 2, it is excellent in vibration proofing and vibration control. In addition, it is possible to eliminate the influence of the bellows 3 from other members (not shown) by the covering portion 5 of the rubber member, and it is possible to complement the rubber member in combination with the excellent properties of the metal member, The pipe body 2 can also be protected from the radial direction. In any case, the covering portion 5 on the outer periphery of the bellows 3 is provided with an expansion / contraction absorbing portion 6 that absorbs at least expansion and contraction in the axial direction. Specifically, the outer periphery of the covering portion 5 of the valley portion 3b of the bellows 3 is U-shaped. Since the notch portion 7 is provided, it is possible to provide a vibration-proof pipe joint member having excellent amplitude strength, expansion / contraction strength, bending strength, and the like in the axial direction.

  In FIG. 2, a constant thickness portion is formed on the covering portion 5 provided on the outer periphery of the bellows 3. That is, the expansion / contraction absorbing portion 6 that absorbs expansion / contraction in the axial direction forms a constant thickness portion 7a along the outer periphery of the covering portion 5 of the peak portion 3a of the bellows 3 and the valley portion 3b. For this reason, it can be set as the pipe joint member for vibration isolation excellent in the amplitude intensity | strength in the axial direction, expansion-contraction strength, bending strength, etc., and especially expansion-contraction strength can be made favorable.

    In FIG. 3, the expansion / contraction absorbing portion 6 that absorbs expansion / contraction in the axial direction is formed by forming a cut portion 7 b extending in the radial direction in the covering portion 5, and a V-shape extending in the radial direction of the tube body 2. Expansion or contraction in the axial direction can be absorbed by the cut shape or thinner than that. For this reason, it can be set as the anti-vibration pipe joint member excellent in the amplitude intensity | strength in the axial direction, expansion-contraction strength, bending strength, etc.

    The tube body 2 prevents expansion and contraction in the axial direction and also prevents expansion and contraction in the radial direction of the tube body 2 so that it can follow ground subsidence and displacement and torsion of the tube body 2. It prevents and protects interference from other members such as damage and breakage of the main body 2 from the radial direction.

    FIG. 4 shows a relatively short axial length pipe joint member 1 in which the pipe body 2 has a single bellows 3. A covering portion 5 having a constant thickness is formed on the peak portion 3a and its end portion 3b, and the covering portion 5 is formed by forming a stretch absorbing portion 7 that absorbs expansion and contraction at least in the axial direction. The expansion and contraction in the axial direction is absorbed by the cut extending in the radial direction. For this reason, it can be set as the anti-vibration pipe joint member excellent in the amplitude intensity | strength in the axial direction, expansion-contraction strength, bending strength, etc.

    In FIG. 5, the crest portion 3 a and its end portion 3 b are formed with a stretch absorption portion 6 that absorbs expansion and contraction at least in the axial direction as a constant thickness portion. For this reason, it can be set as the anti-vibration pipe joint member excellent in the amplitude intensity | strength in the axial direction, expansion-contraction strength, bending strength, etc.

    In forming the pipe joint member 1, a single-layer bellows is shown in forming the bellows 3, but a two-layer or multi-layer bellows may be used as shown in FIG. 8. In the case of a two-layer or multi-layer bellows, it is necessary not to give the influence of heat by welding. In this case, a flat plate-like first steel plate and a second steel plate are prepared. Then, an inner layer pipe 2X around which the first steel plate is wound and an outer layer pipe 2Y around which the second steel plate is wound are created separately.

    The inner layer pipes 2X created separately have a vibration damping action on the outer surface of the inner layer pipe, for example, powder electrostatic coating. Then, the inner layer pipe that is electrostatically powder coated with resin powder that has a vibration damping action integrally on the outer surface is overlapped with the outer layer pipe 2Y fitted, and is placed in the gap between the inner layer pipe and the outer layer pipe. A three-layer damping steel plate pipe with resin powder interposed is formed. Thereafter, the three-layer damping steel pipe is subjected to bellows processing. Z2 indicates the outer layer side, and Z1 indicates the outer layer side.

    As the damping member X, for example, a resin powder having a damping action is applied by powder electrostatic coating. In this case, the resin powder can be appropriately selected from nylon / epoxy resin, polyethylene / epoxy resin, and the like. The resin powder is assumed to have a predetermined width and diameter smaller than the thickness 0.3t of the outer layer pipe and the inner layer pipe.

    Also, powder coating or the like does not use a catalyst such as an organic solvent in the coating process, but mainly uses a polyester powder coating, and includes electrostatic coating or liquid coating. In electrostatic coating, raw materials in a powder state are heated, baked in a molten state, cooled and cured to form a coating film. In liquid coating, a raw material in a liquid state is evaporated with a solvent, and fusion baking is performed to form a coating film.

    The arc welder is not shown, but any type can be used as long as it can weld a stainless steel plate. For example, there is a “DC pulse TIG” welder. A welded steel pipe is manufactured by a multi-stage forming stand in which steel strips slit to a predetermined width are sequentially bent in the plate width direction, roll-formed into an open pipe, and welded at both ends in the plate width direction. Moreover, you may heat the both ends of the plate width direction of a steel plate by the heating by a high frequency induction heating coil.

    As the pipe forming apparatus, known pipe forming apparatuses such as the bellows hydraulic forming method and the bellows roll forming method shown in FIGS. 9, 10, and 11 can be used. In the bellows hydraulic forming method, molding dies A and B are attached to the outside of the bellows material tube, liquid is injected into the material tube, a predetermined pressure is applied to the liquid, the material tube is expanded, and at the same time a press machine Compress and mold with. In the bellows roll forming method, roll molds C and D are attached to the outside and inside of the bellows material pipe, and the roll mold is pressed against the material pipe.

    As in this embodiment, in a pipe joint member having a relatively short length having a bellows of one and a plurality of peaks, the outer circumference of the pipe body is covered with a rubber member that is thicker than the outer circumference of the bellows. Therefore, it is possible to eliminate the influence of the bellows from other members while being excellent in vibration-proofing properties and vibration-damping properties, and can be complemented by the rubber member together with the excellent properties of the metal member.

    It also prevents the pipe joint member from extending due to internal pressure, prevents the pipe body from expanding and contracting in the radial direction, and prevents interference from other members such as scratches and breakage. It is also effective for noise reduction and excels in absorbing displacement. It can be set as a pipe joint member. And since the expansion | extension absorption part which absorbs at least expansion / contraction in an axial center direction was provided in the coating | coated part of bellows outer periphery, the pipe joint member for vibration isolation excellent in the amplitude intensity | strength in the axial direction, expansion / contraction strength, bending strength, etc. It can be.

  As shown in FIGS. 6 and 7, the covering portion 5 may have various forms such as being formed inside the tube main body 2, and can be appropriately changed in design within the scope of the present invention.

    It is sectional drawing which shows the pipe joint member for vibration suppression which provided the U-shaped notch part in the outer periphery of the coating | coated part of the trough part of a bellows.     It is sectional drawing which shows the pipe joint member which formed the constant thickness part in the coating | coated outer periphery of the peak part and trough part of a bellows.     It is sectional drawing which shows the pipe joint member which provided the notch part in the coating | coated part provided in the outer periphery of the bellows.     It is sectional drawing which shows the pipe joint member which provided the thick coating | coated part and the notch | incision part in the outer periphery of one bellows.     It is sectional drawing which shows the pipe joint member which provided the coating | coated part of constant thickness on the outer periphery of the bellows of 1 pile.     It is sectional drawing which shows the pipe joint member which provided the coating | coated part in the inner periphery of the bellows.     It is sectional drawing which shows the pipe joint member of the 2nd Example which provided the coating | coated part in the inner periphery of the bellows.     It is sectional drawing which shows the case of a two-layer bellows.     It is explanatory drawing which shows the bellows hydraulic pressure forming method when opened.     It is explanatory drawing which shows the bellows hydraulic pressure forming method when closed.     It is explanatory drawing which shows a bellows roll shaping | molding method.     It is sectional drawing which shows the conventional multiple mountain bellows.     It is sectional drawing which shows the conventional 1 bellows bellows.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe joint member 2 Pipe main body 3 Bellows 3a Mountain part 3b Valley part 4 Flange 5 Covering part 6 Elastic absorption part

Claims (6)

    The pipe body is a bellows having a peak portion and a valley portion, and is a pipe joint member having a relatively short axial length, and a coating portion made of a thick rubber member is formed on the outer periphery of the bellows. An anti-vibration pipe joint member having an expansion / contraction absorbing portion for absorbing expansion / contraction of the pipe body in at least the axial direction.     The anti-vibration pipe joint member according to claim 1, wherein the expansion / contraction absorbing portion for absorbing expansion / contraction in the axial direction has a U-shaped notch formed on the outer periphery of the covering portion of the bellows valley.     The anti-vibration pipe joint according to claim 1, wherein the expansion / contraction absorbing portion for absorbing expansion / contraction in the axial direction forms a constant thickness portion along the outer periphery of the covering portion of the peak portion and the valley portion of the bellows. Element.     The anti-vibration pipe joint member according to claim 1, wherein the expansion / contraction absorbing portion for absorbing expansion / contraction in the axial direction is formed as a cut portion in the covering portion.     The pipe body is a pipe joint member having a relatively short axial length having a bellows of one crest, and a covering portion having a constant thickness is formed on the crest portion and its end portion. An anti-vibration pipe joint member, wherein an expansion / contraction absorbing portion that absorbs at least expansion / contraction in the axial direction is formed as a cut.     6. The antivibration pipe joint member according to claim 5, wherein an expansion / contraction absorbing portion that absorbs at least expansion / contraction in the axial direction is formed as a constant thickness portion at the peak portion and its end portion.

Images