JPH10318479A - Vibration absorbing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration absorbing pipe whereby a structure is simple, manufacture is facilitated, reduction of a cost can be maintained, also while maintaining vibration damping force of a bellows part, pressure resisting strength is increased, expansion by an internal pressure can be completely prevented. SOLUTION: In a vibration absorbing pipe main body 1 having a bellows part 2 with a straight pipe part 3, 3 successively provided in both sides, a non- extending tube 4 having a mesh (space) is externally fitted to the bellows part 2, both ends of the non-extending tube 4, under its non-extension condition, are fixed to each straight pipe part 3, 3, under this condition, in a periphery of the bellows part 2, a liquid state elastic material is poured, to be solidified, a tubular elastic body 6 in a condition containing the non-extending tube 4 is integrally fixedly molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration absorbing tube which is incorporated in a refrigerant circuit of an air conditioner or the like in which a compressor generates vibration and other piping circuits which generate vibration to suppress resonance.

[0002]

2. Description of the Related Art A straight pipe (pipe) made of copper is mainly used for piping of a refrigerant circuit of an air conditioner or the like. However, since vibration generated by a compressor or the like may cause the piping to resonate and cause noise, In order to suppress the resonance of the pipe, a vibration absorbing pipe having a center formed in a bellows shape to impart flexibility is used.

[0003] Such a vibration-absorbing tube is one in which both ends are joined and integrated with a normal straight tube so as to be incorporated into a required portion of the pipe. , It is thinner and inevitably inferior in pressure resistance as compared with a straight pipe, and the bellows portion of the vibration absorbing pipe may be deformed and expanded by internal pressure.

Conventionally, Japanese Patent Application Laid-Open No. 6-281294 discloses a means for reinforcing the lack of pressure resistance of the vibration absorbing tube.
It has been proposed to integrally form a rubber cover around the bellows portion by injection molding.

[0005]

In the conventional vibration absorbing tube described above, in order to integrally form a rubber cover on the outer periphery of the bellows portion by injection molding, deformation due to rubber vulcanization pressure or injection pressure is required. In order to prevent it beforehand, it is necessary to work to put in and out the stuffing into the inside of the vibration absorbing tube each time, and the manufacturing process becomes complicated and cost increases, and the rubber cover has elasticity due to the characteristics of the material. Therefore, the expansion of the bellows portion cannot be completely prevented.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the conventional vibration absorbing tube, and has a simple structure, can be easily manufactured, can reduce the cost, and maintains the vibration damping force of the bellows portion. It is an object of the present invention to provide a vibration absorbing tube that can increase pressure resistance and completely prevent expansion due to internal pressure.

[0007]

The structure of the present invention for achieving the above object will be described with reference to an embodiment. A vibration absorbing member having a bellows portion 2 having straight pipe portions 3, 3 connected on both sides is described. A non-extensible tube 4 having a stitch (gap) is externally fitted to the bellows portion 2 of the pipe main body 1, and both ends of the non-extensible tube 4 are fixed to the straight pipe portions 3, 3 in a non-extended state,
Then, a liquid elastic material is poured around the bellows portion 2,
It is characterized in that the cylindrical elastic body 6 containing the non-extensible tube 4 is solidified and integrally formed by solidification.

[0008]

In the vibration absorbing tube 1 according to the present invention constructed as described above, at the outer periphery of the bellows portion 2, the non-extensible tube 4 having both ends caulked and fixed in the non-extended state does not extend any further. The expansion of the bellows portion 2 can be completely suppressed from the characteristics and the elastic characteristics of the cylindrical elastic body 6 containing the non-extensible tube 4, whereby the pressure resistance can be greatly increased and the bellows can be improved. The vibration damping force is not impaired without impairing the flexibility originally held by the part 2.

In addition, the elastic body 6 can effectively suppress the propagation of the vibration sound, and can enhance the noise prevention effect.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings based on the following embodiments. The vibration absorbing tube main body 1 is made of a metal such as copper, stainless steel, aluminum or the like. In the case of aluminum, it is preferable to apply copper plating to prevent electrolytic corrosion. The vibration absorbing tube main body 1 is shown in FIG.
As shown in FIG. 1, a bellows portion 2 for providing flexibility is formed at the center of the straight tube, and straight tube portions 3 are provided on both sides of the bellows portion 2.
3 are formed continuously.

The bellows portion 2 of the vibration absorbing tube main body 1 described above.
As shown in FIG. 1, a non-extensible material is externally fitted so as to be covered with a non-extensible tube 4 which is braided in a tubular shape with a non-extensible material, and both ends of the non-extensible tube 4 are vibrated. The straight pipe portions 3 on both sides of the absorption pipe main body 1 are firmly fixed by caulking metal fittings 5 and 5.

The non-extensible tube 4 can be made of a novoloid fiber such as Kepler (trade name), glass fiber, carbon fiber, or the like as the non-extensible material. It is a braided tube having a rough stitch and a stitch (gap).

The non-extensible tube 4 thus constructed is
When a tensile force is applied to the braided structure, the braided structure undergoes a slight tensile deformation, so that the braided structure has such a characteristic that even if only the deformation is extended, it is not further extended. Therefore, the non-extensible tube 4 is stretched by the amount corresponding to the tensile deformation, and both ends of the non-extensible tube 4 are connected to the straight pipe portions 3 and 3 on both sides of the vibration absorbing tube main body 1 in a non-extended state where the tube is not further extended.
In the above, firmly caulking and fixing with appropriate caulking metal fittings 5,5.

On the outer periphery of the bellows portion 2 of the vibration absorbing tube main body 1 on which the non-extensible tube 4 is mounted, a cylindrical type (not shown) is provided to form a liquid rubber or liquid urethane resin. Pour the elastic material. Then, the liquid elastic material can flow into the non-extensible tube 3 from the stitch (gap) thereof. When the liquid elastic material is solidified, the outer periphery of the bellows portion 2 of the vibration absorbing tube main body 1 becomes
The non-extensible tube 4 is made of a cylindrical soft rubber elastic body 6.
And is integrally fixedly formed.

When the liquid elastic material is liquid rubber,
The liquid rubber is obtained by dissolving the solid rubber in a liquid state using a solvent, and can be solidified by heating to remove the solvent to form the elastic body 6. In the case of a liquid urethane resin, a liquid A (isocyanate) and a liquid B (polyol)
When the two liquids are mixed, the foaming and the resinification reaction can be performed to form the elastic body 6 of foam rubber.

A liquid rubber material such as liquid rubber or liquid urethane resin contains a powder material having a high specific gravity, such as iron powder, in a weight ratio of 1: 1.
It is preferable to increase the specific gravity of the elastic body 6 by mixing about 0 to 20%. When the specific gravity of the elastic body 6 is set to be large as described above, the resonance point of vibration can be dispersed to suppress metal fatigue, which is extremely effective in improving durability.

[0017]

According to the present invention, as described above, it is possible to completely prevent the expansion due to the internal pressure by increasing the pressure resistance without disturbing the vibration damping force of the bellows portion 2 with a simple structure, and to reduce the vibration. It is possible to effectively suppress the propagation of sound, enhance the noise prevention effect, and achieve an excellent effect that the manufacturing can be facilitated and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a partially cut-out state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration absorption pipe main body 2 Bellows part 3 Straight pipe part 4 Non-extensible tube 5 Caulking metal fitting 6 Elastic body

Claims (2)

[Claims] 1. A bellows portion 2 having straight pipe portions 3, 3 connected on both sides.
A non-extensible tube 4 having a stitch (gap) is externally fitted to the bellows portion 2 of the vibration absorption tube main body 1 having a stitch, and both ends of the non-extensible tube 4 are straight pipe portions 3 and 3 in a non-extended state. , And then a liquid elastic material is poured around the bellows portion 2 and solidified to integrally form a cylindrical elastic body 6 containing the non-extensible tube 4. And vibration absorbing tube. 2. The vibration absorbing tube according to claim 1, wherein a powder material having a high specific gravity, such as iron powder, is mixed into the liquid elastic material to increase the specific gravity of the elastic material.