JPH0522710Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a flexible tube mainly used in refrigeration circuits of freezers, refrigerated cars, and the like.

(Prior art) A flexible tube as shown in Figure 3 is used in a part of the piping that makes up the refrigerant circulation circuit of large freezers, refrigerated cars, etc. to absorb vibrations generated from compressors, motors, engines, etc. ing.

That is, the tube main body 1 is made of a metal plate with corrugations 1a continuously formed in a spiral shape on the circumferential surface.
(1 cm to 5 cm in diameter, approximately 0.5 to 3 m in length) is fitted with an outer layer blade 2 made of braided metal wire on the outside, and a blade holding ring 5 is fitted on the outer periphery of both ends, and the end surfaces are aligned and welded. , Thus, the joint fitting 3 consisting of a straight pipe or a curved pipe is provided on both end faces.
The tube ends of 4 are butted against each other, and the periphery of the butted portion is again brazed and connected.

(Problem to be solved by the invention) Moisture in the atmosphere tends to condense and adhere to the piping for refrigerant circulation in refrigerators, especially the piping on the low-pressure side. If a low-temperature refrigerant flows inside the tube body with moisture attached to its surface, the moisture will freeze and the tube body will lose its flexibility and become rigid, applying unreasonable force to the tube body. If cracks or cracks occur in the wave crests, or if the blade surface is scratched by friction, the blade wires become more likely to break, reducing pressure resistance and causing damage.

Therefore, this invention provides a flexible tube that does not crack or break even if moisture adheres to the outside and low-temperature fluid flows inside.

(Means for solving the problem) Based on the above-mentioned purpose, this invention consists of fitting an outer layer braid made of thin metal wires on the outer periphery of the tube body, which has continuous wave crests formed on the circumferential surface, and It is a flexible tube with fittings connected to both ends, and is characterized in that at least the outer periphery of the outer blade is coated with a rubber coating layer with a part of the rubber embedded in the troughs of the waves of the tube body.

(Example) Figures 1 and 2 show examples of this invention.
The same parts as those described above will be described using the same reference numerals.

The tube body 1 is made of a metal plate such as stainless steel, and has corrugations 1a continuously formed in a spiral shape on its circumferential surface, and an outer layer braid 2, which is also braided with fine metal wires such as stainless steel, is fitted on the outside of the tube body 1. A blade holding ring 5 is fitted to the outer periphery of both ends of the outer layer blade 2, and these tube bodies 1,
The end surfaces of the outer layer blade 2 and the retaining ring 5 are aligned and welded, and furthermore, on both ends of the tube body 1,
The pipe ends of fittings 3, 4 for straight pipes or bent pipes (this may be only for straight pipes or only for bent pipes) having threaded fittings 3a, 4a at the ends are butted against each other, and The periphery of the mating portion is welded and connected to the tube body 1 or the blade retaining ring 5.

However, the above configuration is the same as the conventional one. By the way, in this invention, a coating layer 6 made of a rubber material is applied from the circumferential surface of the outer layer blade 2 to the circumferential surface of the joining part of the joint fittings 3 and 4 on both sides, and a As shown in Figure 2, it is applied by pressure vulcanization so that it is embedded in the wave valleys of the tube body 1 through the braided stitches.

To apply the rubber coating layer 6, a natural or synthetic rubber material is wrapped around the circumferential surface of the outer blade 2, the circumferential surface of the blade retaining ring 5, and the circumferential surface of the joint of the joint fittings 3 and 4. Then, the rubber material is placed in a mold and heated and pressurized to vulcanize it, or a band cloth is tightly attached in a spiral shape to the surface of the rubber material applied to the above-mentioned area and heated with steam to vulcanize it. In this way, a part of the rubber material passes through the stitches of the blade 2 and enters the tube body 1.
It is embedded in the troughs of the waves and deposited.

In this case, the rubber coating layer 6 may be applied only to the peripheral surface of the outer layer blade 2.

In addition, in the above example, the pipe ends of the fittings 3 and 4 are joined to the end face of the tube body 1, but the present invention is not limited to this. It can also be applied to a structure in which the pipe is stretched into a straight tube shape, and the tube end of the joint fitting is fitted into the stretched portion for connection. Further, the joint fitting may also be of any type as long as the connecting portion forms a tubular body, and is not limited to the structure shown in the drawings.

(Effects of the invention) As described above, this invention is a flexible tube in which an outer layer braid made of thin metal wires is fitted on the outer periphery of the tube body, which has continuous wave crests formed on the circumference, and fittings are connected to both ends. As,
At least on the outer periphery of the outer blade, a rubber coating layer is applied so that a portion of the rubber sinks into the troughs of the tube body, so moisture in the atmosphere will not get into the troughs of the tube body, unlike in the past. , without adhering to the surface of the outer blade, and even if low-temperature fluid flows inside the tube body during use, the water will only freeze on the outside of the rubber coating layer, causing stiffness of the tube body and outer blade. It can properly prevent scratches, and there is no fear of creating scratches on the surface of the outer layer blade, improving durability.
Moreover, since a part of the rubber coating layer is embedded in the corrugations of the tube body, deformation of the wave ridges of the tube body due to internal pressure is suppressed, flexibility is ensured, and vibration absorption is good. have an effect.

[Brief explanation of the drawing]

FIG. 1 is a half-sectional side view of one embodiment of this invention.
Figure 2 is an enlarged half-sectional view of a part of it. Figure 3 is a half-sectional side view of the conventional product. In the figure, 1... tube body, 1a... wave peak, 2
...Outer layer blade, 3, 4...Joint fittings, 5...
Blade holding ring, 6...Rubber coating layer.

Claims (1)

[Scope of utility model registration request] In a flexible tube in which an outer layer braid made of braided metal wires is fitted on the outer periphery of a tube body having continuous wave crests formed on the circumferential surface, and fittings are connected to both ends of the outer layer blade, at least the outer periphery of the outer layer blade is fitted. A flexible tube that is coated with a rubber coating layer by inserting a portion of the rubber into the troughs of the waves on the tube body.