JPS5824709Y2 - pressure hose - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement in a pressure-resistant hose having a reinforcing layer.

This type of pressure hose generally has a plastic tube of 7” (
It consists of an inner tube), a reinforcing layer provided on the surface of the plastic tube, and a plastic cover (outer tube) that covers these.

When using a braided layer as the reinforcing layer, there are two types: one where the yarn is braided directly onto the surface of the tube without applying an adhesive to the surface of the tube, and one where the yarn is braided directly onto the surface of the tube without applying an adhesive. It was known that the structure consisted of a braided structure.

When using a long hose, it must be cut to the required length, and connecting fittings must be attached to both ends to connect to the other device.

The outside diameter of the nipple (hose insertion cap) installed on this fitting is slightly larger than the inside diameter of the hose.

For hoses that do not have adhesive applied to the surface of the inner tube (tube), the reinforcing layer is unrestrained, so when the hose is inserted into the nipple, the inner tube will touch the other end of the hose. It has the disadvantage that it protrudes and makes it difficult to attach metal fittings.

On the other hand, for hoses with adhesive applied to the surface of the inner tube, adhesive is applied to the entire surface of the inner tube.
Since the braided layer and the inner tube are bonded and restrained, the above-mentioned disadvantage of the tube coming off can be solved, but when the fitting is attached to the hose, it is fastened with strong caulking, so the inner tube and the braided layer are tightly bound together. The bond with the adhesive is destroyed and it no longer functions as an adhesive, and the adhesive used for this type of adhesive has poor heat resistance and is easily softened by heat.
This destroyed adhesive acts as a lubricant and causes the reinforcing layer to become slippery.

In addition, since the inner and outer tubes are made of synthetic resin, the fastening force of the fittings decreases due to creep and heat softening, which can cause the hose to gradually pull out from the fittings during use. had the major drawback that the hose would break.

Hose V has a structure in which no adhesive is applied to the surface of the inner tube.
It has been known in the past that the phenomenon of the hose coming off from the metal fittings as described above is relatively rare with C-type hoses compared to those treated with adhesive.

The present invention was devised to solve the above-mentioned drawbacks of the conventional hoses.The present invention is designed to solve the above-mentioned drawbacks of the conventional hoses.After applying adhesive evenly to the surface of the inner tube by applying buttons at predetermined intervals, a reinforcing layer and an outer tube are provided. To provide a pressure-resistant hose that can reduce the possibility of the hose coming off from a metal fitting during use, provide stable fastening performance, and prevent the tube from coming off when the metal fitting is attached.

The actual implementation of the present invention will be explained below based on the attached notes.

In the figure, reference numeral 1 denotes a pressure-resistant hose according to the present invention, which has an inner pipe (tube) 2.

The inner tube 2 is made of a thermoplastic resin material such as nylon or urethane.

Reference numeral 3 denotes an adhesive applied to the surface of the inner tube 2, which is applied linearly in the axial direction of the inner tube 2 and at appropriate regular intervals in the circumferential direction.

Reference numeral 4 denotes a reinforcing layer, which is formed by braiding yarns (woven threads) of nylon, polyester, etc. around the inner tube 2, and is bonded and restrained to the inner tube 2 by an adhesive 3.

Reference numeral 5 denotes a single layer of cover installed on the upper surface of the reinforcing layer 4, and the cover 7 layer 5 is made of the same material as the inner tube 2;
Materials that are softer are used to provide flexibility.

FIG. 4 shows the case where the pressure-resistant hose 1 is attached to the fastening fitting 6. The inner tube 2 is inserted into the nipple 7, and the tightening is done by fitting 8.
The pressure hose 1 is attached to the fastening fitting 6 by tightening the attachment end thereof.

The method of applying the adhesive 3 to the inner tube is to apply it uniformly to the surface of the inner tube at predetermined intervals, as shown in Figure 1.
and the adhesive 3 in a straight line as shown in Figure 2.
In addition to applying the material, it may be applied in a spiral manner, for example as shown in FIG.

In addition, it may be applied in a continuous line such as in a zigzag or meandering pattern, or it may be applied intermittently in spots.
In short, it is preferable to uniformly apply the coating to the outer surface of the inner tube 2 in a well-balanced manner.

Here, applying in a line is about 1 mm in width and 0.0 mm in thickness.
The total coating area should be about 20% (during coating operation) of the surface area of the inner tube 20 or less.

In this case, the adhesive 3 is spread out over the surface of the inner tube 2 by the braided reinforcing layer 4, and occupies less than 40% of the total surface of the inner tube 2.

In other words, the adhesive 3 may be applied to the surface of the inner tube 2 to the extent that it prevents the inner tube 2 from protruding from the nipple 7 when the fastening fitting 6 is attached to the pressure hose 1. .

By applying this amount of adhesive 3, the fastening force of the metal fittings 6 may be reduced due to creep that occurs in the inner pipe 2 button and the cover layer (outer pipe) 5 when the hose 1 is used, or the fastening force may be reduced due to thermal softening of the button when heated. Even if the force is reduced, when the hose 1 is tightened with the metal fitting 8, the adhesive 3 is not applied to the entire outer surface of the inner tube 2, so the broken adhesive layer 3 is removed. Even if it acts as a lubricant, it is not present on the entire surface of the inner tube 2, so phenomena such as hose disconnection will not occur, and stable fastening performance can be maintained during use.

Therefore, it is not necessary to use an expensive heat-resistant material as the adhesive 3 applied to the outer surface of the inner tube 2, and even an inexpensive adhesive with no heat resistance can sufficiently exhibit its adhesive performance.

As described above, in the present invention, adhesive is uniformly applied on the surface of the inner tube at predetermined intervals, then a reinforcing layer and an outer tube are provided, and the inner tube and the reinforcing layer are bonded at predetermined intervals using the adhesive. Since this is a pressure-resistant hose bound with adhesive, even if the fastening force of the metal fittings decreases due to creep or thermal softening under heat, the effect of slipping of the reinforcing layer due to the adhesive can be minimized, so the hose will not fly away from the metal fittings during use. Since it does not come out, it has the advantage that it can provide stable fastening properties to the hose and also allows the use of adhesives with poor heat resistance.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the end of a pressure hose according to one embodiment of the present invention, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is the end of a pressure hose according to another embodiment of the invention. FIG. 4 is a sectional view showing the pressure hose fastened to the fastening fitting. 2... Inner tube, 3... Adhesive, 4... Reinforcement layer, 5...
...Outer tube.

Claims (1)

[Scope of utility model registration request] For a pressure-resistant hose that has an inner tube, a braided reinforcing layer end, and an outer tube, apply adhesive to the outer surface of the inner tube at a predetermined interval to the extent that the inner tube does not come out when the fastener is attached to the pressure-resistant hose. A pressure-resistant hose characterized in that the inner pipe and the reinforcing layer are adhesively restrained at predetermined intervals.