JP4718065B2 - Anti-vibration fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint used for the purpose of absorbing vibration generated in a pipe, and more particularly to a vibration-proof pipe joint suitable for absorbing vibration in a high-pressure pipe.
[0002]
[Prior art]
Many pipes are laid in various facilities, factories, plants and the like. These piping paths are generally fixed and laid on a mounting member provided in a building frame or facility of a building, but vibration may be transmitted from the building or mechanical equipment to the piping channel via the mounting member. Normally, a pipe line is constructed by connecting a certain length of pipe with a joint, etc., so if the pipe line is vibrated, the joint part, etc., which is weak in strength will be damaged, and the fluid in the pipe will leak out from there. . Therefore, in order to prevent such damage accidents, some measures for vibration isolation are often applied to the piping.
[0003]
A common method for preventing vibrations in piping is to attach flexible pipe joints to the piping at appropriate intervals. A flexible pipe joint is composed of a main body composed of a bellows-shaped cylinder made of an elastic material such as rubber, and flange connection portions formed at both ends thereof, and vibration transmitted to the piping is flexible. Absorbed by the bellows part.
[0004]
[Problems to be solved by the invention]
However, since the main body portion of the flexible pipe joint is made of an elastic material such as rubber, the pressure resistance cannot be so high. Therefore, a method of increasing the pressure resistance by thickening the rubber layer according to the internal pressure of the pipe or embedding a reinforcing material such as a tire cord in the rubber has been adopted, but there is a limit to improving the pressure resistance. Then, this invention makes it a subject to provide the pipe joint for vibration suppression which can be used suitably especially for high pressure piping.
[0005]
[Means for Solving the Problems]
That is, the vibration-proof pipe joint of the present invention has a flange connection portion (7) having an enlarged outer shape at one end, the first spiral protrusion (2a) is formed on the outer surface, and the inner surface is formed in a smooth cylinder. A rigid first cylinder (2) having an inner cylinder portion (4) formed;
A flange connecting portion (10) having an enlarged outer shape at the other end, a tip having a pitch equal to the pitch of the first spiral ridge (2a) and smaller than the tip diameter of the first spiral ridge (2a) A rigid second cylinder (3) having an outer cylinder portion (5) formed with a second spiral protrusion (3a) having a diameter on the inner surface and a smooth cylinder on the outer surface ;
The first spiral ridge (2a) of the first cylinder (2) is inserted into the second spiral ridge (3a) of the second cylinder (3) while rotating relative to each other from the tip side. In the state where the gap (12) is formed in a spiral between the spiral ridges (2a) (3a),
Including the gap portion (12) and the flange connection portions (7) and (10), an elastic member (13) is integrally interposed on the inner and outer peripheries of the first cylinder (2) and the second cylinder (3). The elastic member (13) coated on the inner surface thereof is smoothly formed with the same diameter over the entire length,
The first cylinder (2) and the second cylinder (3) are formed so as to be relatively movable in the axial direction . (Claim 1)
[0008]
In the vibration isolating pipe joint, the first cylindrical body, the second tubular member and the elastic member can be manufactured by insert molding (claim 2).
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a vibration-proof pipe joint according to the present invention, and is a cross-sectional view in which the lower half of the first cylinder 2 and the entire second cylinder 3 are cut. FIG. 2 is an exploded view of the first cylinder 2 and the second cylinder 3, and only the second cylinder is cut.
The anti-vibration joint 1 includes a rigid first cylinder 2 and a second cylinder 3, and a first spiral protrusion 2 a having a spiral waveform on the outer surface is formed on the distal end side of the first cylinder 2. The outer cylinder part 4 which has the 2nd spiral protrusion 3a which formed the helical waveform on the inner surface side is provided in the front end side of the 2nd cylinder 3, and the inner cylinder part 4 which has is provided. And the helical pitch of the 1st spiral protrusion 2a is formed equal to that of the 2nd spiral protrusion 3a. Furthermore, the tip diameter of the first spiral ridge 2a is formed larger than the tip diameter of the second spiral ridge 3a.
[0010]
On the rear side of the inner cylinder portion 4 in the first cylinder 2, a flange connection portion 7 having an enlarged outer diameter is continuously provided via a straight portion 6, and a bolt hole having an inner screw portion in the flange connection portion 7. 8 is formed. A bolt that connects a flange surface of a pipe (not shown) is screwed into the bolt hole 8.
On the other hand, on the rear side of the outer cylindrical portion 5 in the second cylindrical body 3, a flange connecting portion 10 having an enlarged outer diameter is continuously provided via a straight portion 9, and the flange connecting portion 10 has an inner screw portion. Bolt holes 11 are formed. Similarly to the bolt hole 8, the bolt hole 11 is screwed with a bolt for connecting a flange surface of a pipe (not shown).
[0011]
Both the first cylinder 2 and the second cylinder 3 are made of a material having rigidity and high mechanical strength, for example, a metal material such as cast iron, aluminum or stainless steel, or a hard plastic such as hard vinyl chloride or polyethylene. be able to. And the inner cylinder part 4 of the 1st cylinder 2 is inserted inside the outer cylinder part 5 of the 2nd cylinder 3, and, thereby, the 1st cylinder 2 and the 2nd cylinder 3 partially overlap in the axial direction of a joint. The part which is doing is formed.
[0012]
The outer side of the inner cylinder part 4 and the inner side of the outer cylinder part 5 are separated from each other with a predetermined gap in the radial direction, and the gap part 12 formed in the part is made of an elastic rubber material or plastic material. An elastic member 13 is interposed. The elastic member 13 in this example is interposed in a state where the gap portion 12 is completely filled, and the elastic member 13 and the inner cylinder portion 4 and the outer cylinder portion 5 are completely integrated. By interposing the elastic member 13 in the gap portion 12 in such a form, the gap between the first cylinder 2 and the second cylinder 3 is closed to ensure good sealing performance and high physical strength is obtained. ing.
[0013]
On the other hand, since the inner cylinder part 4 and the outer cylinder part 5 are separated from each other as described above, the vibration transmitted to the pipe is absorbed by the elastic member 13 interposed therebetween. Further, most of the internal pressure of the pipe applied to the joint is uniformly applied to the inner wall surfaces of the first cylinder 2 and the second cylinder 3, but since these parts are made of a rigid material, the pressure resistance is high. Is secured.
[0014]
Moreover, since the inner cylinder part 4 and the outer cylinder part 5 have a comparatively long overlapping part which is corrugated in the axial direction, the elastic member 13 interposed there also forms an elongated corrugated cylindrical body. And the internal pressure with respect to the elastic member 13 concentrates on the front-end | tip part of the inner cylinder part 4, and since it is applied to the length direction of the waveform in the elastic member 13, the elastic member 13 has comparatively small physical strength, such as rubber | gum. Even when made of a material, a sufficiently high pressure resistance is ensured.
[0015]
Furthermore, in the corrugated part of the inner cylinder part 4 and the outer cylinder part 5, one crest part and the other trough part overlap each other in the radial direction, and the crest part bites into the trough part. When the axial vibration is applied to the first cylindrical body 2, the stress that separates the first cylindrical body 2 and the second cylindrical body 3 in the axial direction can be received at the overlapping portion. Therefore, there is no possibility that the first cylinder 2 will come out of the second cylinder 3.
[0016]
Further, in this example, the elastic member 13 is integrally extended from the gap portion 12 to the surface portions of the first cylinder 2 and the second cylinder 3, specifically, the first cylinder 2 and the second cylinder 3. Both the inner fluid contact portion and the outer side of the vibration-proof pipe joint 1 are covered with the elastic member 13. If comprised in this way, the corrosion resistance or durability of the vibration-proof pipe joint 1 can be improved.
For example, when the piping fluid is a corrosive gas such as chlorine gas or a corrosive liquid, even if the material of the first cylinder 2 or the second cylinder 3 is made of a corrosive material such as cast iron, the elastic member 13 Can be easily made of an inexpensive and corrosion-resistant material, whereby the corrosion-resistant vibration-proof fitting 1 can be provided at a lower cost.
[0017]
The vibration-proof pipe joint 1 shown in FIG. 1 can be manufactured by insert molding. Next, an example of the insert molding process will be described.
The first cylinder 2 is fitted on the outer periphery of a cylindrical inner mold (not shown). The outer diameter of the inner mold matches the inner diameter of the first cylinder 2. And the 2nd cylinder 3 is inserted in the outer side of the 1st cylinder 2, rotating, and the positioning is carried out. Subsequently, the upper mold and the lower mold are divided into halves on the outer circumferences of the first cylinder 2 and the second cylinder 3, and the respective molds, the first cylinder 2 and the second cylinder 3 are respectively fitted. Fill the gap with rubber material and vulcanize. Next, the mold for vibration isolation is completed by removing each mold.
[0018]
FIG. 3 shows a modification of the flange connection portion in the vibration-proof pipe joint of the present invention. 3 corresponds to the portion A in FIG. 1, and the end surface of the flange connecting portion 10 is a simple flange contact surface. Then, the companion flange 14 is disposed on the rear surface of the flange connection portion 10, and the bolt 17 is inserted into the bolt hole and the bolt hole of the flange portion 16 of the pipe 15, and fastened with the nut 18. Although not shown in FIG. 3, a pair of semi-annular flanges 14 are prepared and can be used by fitting them to the flange connection portion 10 and connecting the end portions thereof.
[0019]
【The invention's effect】
As described above, the antivibration pipe joint of the present invention forms the inner cylinder part 4 and the outer cylinder part 5 in a corrugated shape, and the elastic member 13 is interposed in the gap part 12 formed between them. It is excellent in vibration proofing property, pressure resistance, slip-out prevention property, etc., and can be provided at low cost.
[0020]
Further, since the elastic member is extended continuously from the gap to the surface of the first cylindrical body and second cylindrical body can be provided at low cost tube joint having excellent corrosion resistance.
[0021]
In addition, since the flange connecting portion having a large diameter is formed at the ends of the first cylinder and the second cylinder , the flange with the pipe has a simple structure using the elastic member 13 covered on the outer surface of the flange connecting portion. Connection can be easily made liquid-tight .
Furthermore, since the elastic member 13 including the flange connecting portions 7 and 10 and covering the inner surfaces of the first cylinder 2 and the second cylinder 3 is smoothly formed with the same diameter over the entire length, the internal fluid Can be distributed smoothly.
[0022]
In the vibration-proof pipe joint, the first cylinder, the second cylinder, and the elastic member can be manufactured by insert molding. By manufacturing the vibration-proof pipe joint by insert molding, the first and second cylinders made of a metal material and the elastic member made of a plastic material can be formed integrally and easily, and vibration-proofing Therefore, it is possible to provide an anti-vibration pipe joint excellent in pressure resistance and slip-out prevention performance at low cost.
[Brief description of the drawings]
FIG. 1 is a view showing an example of a vibration-proof fitting according to the present invention.
FIG. 2 is a partially sectional exploded view of a first cylinder and a second cylinder of the joint.
FIG. 3 is a view showing an example in which the flange connecting portion of FIG. 1 is modified.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Anti-vibration pipe joint 2 1st cylinder 2a 1st spiral protrusion 3 2nd cylinder 3a 2nd spiral protrusion 4 Inner cylinder part 5 Outer cylinder part 6 Straight line part 7 Flange connection part 8 Bolt hole 9 Straight line part 10 Flange connection 11 Bolt hole 12 Gap 13 Elastic member 14 Companion flange 15 Piping 16 Flange 17 Bolt 18 Nut

Claims (2)

Rigidity with flange connection part (7) having an enlarged outer shape at one end, first spiral protrusion (2a) formed on the outer surface, and inner cylinder part (4) formed on a smooth cylinder on the inner surface The first cylinder (2),
A flange connecting portion (10) having an enlarged outer shape at the other end, a tip having a pitch equal to the pitch of the first spiral ridge (2a) and smaller than the tip diameter of the first spiral ridge (2a) A rigid second cylinder (3) having an outer cylinder portion (5) formed with a second spiral protrusion (3a) having a diameter on the inner surface and a smooth cylinder on the outer surface ;
The first spiral ridge (2a) of the first cylinder (2) is inserted into the second spiral ridge (3a) of the second cylinder (3) while rotating relative to each other from the tip side. In the state where the gap (12) is formed in a spiral between the spiral ridges (2a) (3a),
Including the gap portion (12) and the flange connection portions (7) and (10), an elastic member (13) is integrally interposed on the inner and outer peripheries of the first cylinder (2) and the second cylinder (3). The elastic member (13) coated on the inner surface thereof is smoothly formed with the same diameter over the entire length,
An anti-vibration pipe joint characterized in that the first cylinder (2) and the second cylinder (3) are formed so as to be relatively movable in the axial direction thereof . The vibration-proof pipe joint according to claim 1, wherein the first cylinder (2), the second cylinder (3), and the elastic member (13) are manufactured by insert molding.

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