JPH07224975A - High pressure hose - Google Patents

Abstract

PURPOSE:To provide a high pressure hose of 2% or less in elongation by further reducing the elongation of the hose at the load time. CONSTITUTION:In a high pressure hose 1 having plural braided reinforcing layers 5, 6 between an inner surface layer 2 and an outer surface layer 3, a braiding angle alpha, in the first reinforcing layer 5 is made almost a repose angle, and a braiding angle beta in the second reinforcing layer 6 is made smaller than the braiding angle alpha.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure hose used for cleaning the inner surface of a vertical tubular body such as a well, and more particularly to a high pressure hose designed to reduce the elongation of the hose under load. Regarding the hose.

[0002]

2. Description of the Related Art Conventionally, a high-pressure hose provided with a plurality of reinforcing layers with an intermediate layer between an inner surface layer and an outer surface layer has a problem in that if the hose is used in a state of being hung vertically, the weight of the hose and hose 2 depending on the weight of internal fluid passing through the inside, mounting jig, metal fittings, etc.
% Or more elongation occurs. However, when cleaning the inner surface of a vertical tubular body having a long distance such as a well, it is necessary to keep the hose extension within 2% in order to confirm the position inside the tubular body by the insertion length of the hose.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a high-pressure hose capable of further reducing the elongation of the hose under load and keeping the elongation at 2% or less.

[0004]

The present invention for achieving the above object provides a high-pressure hose having a plurality of braided reinforcing layers between an inner surface layer and an outer surface layer, wherein the plurality of braided reinforcing layers are substantially stationary at a braiding angle. The angle of the first reinforcing layer and the braid angle are the first
It is characterized in that it is configured to have a second reinforcing layer that is smaller than the braiding angle of the reinforcing layer.

[0005]

The present invention is constructed as described above, and in the braided reinforcing layer, the braided angle of the first reinforcing layer is set to a substantially static angle. Since the change is small and the braid angle of the second reinforcing layer is smaller than that of the first reinforcing layer, the weight of the hose itself, the internal fluid passing through the hose, the weight of the mounting jig, the metal fittings, etc. Since it is possible to reduce the elongation of the hose due to the height, by combining the first reinforcement layer and the second reinforcement layer, the elongation of the hose under tensile load should be reduced to 2% or less to further reduce the elongation of the hose. You can

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway partial perspective view showing an example of a high-pressure hose of the present invention. This high-pressure hose 1 is a two-layer braid with an intermediate layer 4 between an inner surface layer 2 and an outer surface layer 3. The reinforcing layers 5 and 6 are provided.

As the inner surface layer 2, the outer surface layer 3 and the intermediate layer 4, any conventionally known material can be used as long as it is made of rubber or resin. For example, in the case of rubber, the inner surface layer 2 is made of nitrile butadiene rubber (NBR). ), Chloroprene rubber (CR), CR for the outer surface layer 3, styrene-butadiene rubber (SBR), NBR, CR for the intermediate layer 4, and in the case of resin, nylon 12 and nylon 11 for the inner surface layer 2 and nylon 12 for the outer surface layer 3. ,
Nylon 11, urethane, and urethane for the mid layer 4 can be preferably used.

The braided reinforcing layer is the first innermost layer.
The reinforcing layer 5 has its braid angle α approximately equal to the rest angle (109.5
°) is braided. The second reinforcing layer 6 arranged outside the first reinforcing layer 5 has a braid angle β of the first reinforcing layer 5
It is set smaller than the braid angle α. First reinforcement layer 5
And reinforcing cords 5a, 6a used for the second reinforcing layer 6
Is not particularly limited as long as it has an elongation at break of 4% or less, and conventionally known materials can be used. For example, aramid fiber, steel wire and the like can be preferably used.

When the aramid fiber is used for the reinforcing cord 6a of the second reinforcing layer 6, it is preferable that the braid angle β be 5 to 60 °. If the braid angle β is less than 5 °, the hose becomes stiff and difficult to bend, and if the braid angle β exceeds 60 °, the hose tends to stretch when used in a vertically hung state. Become. When the reinforcing cord 6a of the second reinforcing layer 6 is made of steel wire, the braid angle β is set in the range of 20 to 60 °, and
The braid density of the second reinforcing layer 6 is preferably 70% or less.
Even if the braid angle β is smaller than 20 °, the braid density is 70
If the braid angle β exceeds 60 °, the hose becomes stiff and difficult to bend even if it is larger than 0.1%, and the hose is liable to stretch when it is used in a vertically suspended state like the aramid fiber.

In the above-mentioned embodiment, the first reinforcing layer 5 is arranged in the innermost layer and the second reinforcing layer 6 is arranged in the outer side thereof, but it may be reversed. Moreover, the 1st reinforcement layer 5 and the 2nd reinforcement layer 6 can also each be provided in multiple layers as needed. In addition, as shown in FIG. 2, a display symbol 7 is provided on the surface of the outer surface layer 3 to indicate the length from the tip 1a of the high pressure hose 1 so that the measure function can be achieved by the vertical length of the hose insertion. It is preferable for easily confirming the position in the tubular body. The display interval of the display symbols 7 is appropriately selected according to need, and can be, for example, 1 m, 50 cm, or 10 cm.

As described above, according to the present invention, the braid reinforcing layer has the first reinforcing layer 5 in which the braid angle α is set to a substantially stationary angle and the second reinforcing layer 6 in which the braid angle β is smaller than that of the first reinforcing layer 5. Since the first reinforcing layer 5 reduces the length change in the longitudinal direction of the hose due to the internal pressure, the second reinforcing layer 6 further reduces the weight of the hose, the internal fluid passing through the hose, the mounting jig,
Since it is possible to reduce the elongation of the hose due to the weight of metal fittings and the like, the combination of the first reinforcing layer 5 and the second reinforcing layer 6 further reduces the elongation of the hose under tensile load and reduces the elongation to 2% or less. It becomes possible to

The first reinforcing layer 5 and the second reinforcing layer 6 are also provided.
It is possible to effectively prevent the high-pressure hose from corroding by configuring both of them with aramid fiber, and it is more preferable for enhancing durability.

[0013]

As described above, according to the present invention, in a high-pressure hose having a plurality of braided reinforcing layers between the inner surface layer and the outer surface layer, the first braided reinforcing layers have a braid angle of approximately a static angle. Since the structure has the reinforcing layer and the second reinforcing layer having a braid angle smaller than the braid angle of the first reinforcing layer,
It is possible to further reduce the elongation of the hose under tensile load and make it less than 2%.

[Brief description of drawings]

FIG. 1 is a partially cutaway partial perspective view showing an example of a high-pressure hose of the present invention.

FIG. 2 is a perspective view of a main part of the high pressure hose of the present invention provided with a display symbol.

[Explanation of symbols]

1 High-pressure hose 2 Inner surface layer 3 Outer surface layer 4 Intermediate layer 5 First reinforcement layer (braided reinforcement layer) 6 Second reinforcement layer (braided reinforcement layer)

Claims (4)

[Claims] 1. A high-pressure hose having a plurality of braided reinforcing layers between an inner surface layer and an outer surface layer, wherein the plurality of braided reinforcing layers have a braided angle of approximately a static angle and a braided angle is the first braided angle. 1. A high-pressure hose configured to have a second reinforcing layer having a braid angle smaller than that of the first reinforcing layer. 2. The high-pressure hose according to claim 1, wherein the second reinforcing layer is braided with a reinforcing cord made of aramid fiber, and the braid angle is 5 to 60 °. 3. The high-pressure hose according to claim 1, wherein the second reinforcing layer is braided with a reinforcing cord made of steel wire, the braiding angle is 20 to 60 °, and the braid density is 70% or less. 4. The high pressure hose according to claim 1, wherein a display symbol indicating the length of the high pressure hose is provided on the surface of the outer surface layer.